CN111816934B

CN111816934B - Cylindrical secondary battery and battery controller

Info

Publication number: CN111816934B
Application number: CN202010056053.0A
Authority: CN
Inventors: 李松; 赵家悦; 邓爱雯
Original assignee: Guangdong Meini Magson Power System Co ltd
Current assignee: Guangdong Meini Magson Power System Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2025-01-24
Anticipated expiration: 2040-01-17
Also published as: CN111816934A

Abstract

A cylindrical secondary battery and a battery controller, the battery includes a battery cell and a controller coaxially packaged with the battery cell, the controller includes: a circuit board and an electrode cap, the circuit board includes: a first surface and a second surface opposite to each other, the second surface is provided with circuit components welded; the electrode cap is made of a conductive metal material, which is welded to the first surface of the circuit board by a patch method, the first surface of the circuit board is provided with an electrode cap pad for welding the electrode cap, and the electrode cap pad has a channel. The present application optimizes the controller structure by welding the electrode cap by a patch method, so that the axial height of the controller is reduced, thereby improving the absolute storage energy and volume specific energy of the rechargeable battery.

Description

Cylindrical secondary battery and battery controller

Technical Field

The invention relates to a columnar battery, in particular to a columnar lithium ion secondary battery technology and a battery controller applied to the battery.

Background

GB/T8897.2 (IEC 60086-2) standardized cylindrical primary batteries, such as No. 5 batteries, no. 7 batteries and the like of China popular specification, are widely applied to the fields of handheld or portable electronic and electric products. Because primary batteries are not reusable, and there are problems of high battery use costs, environmental pollution from waste batteries, etc., there is an increasing demand in the consumer market for rechargeable battery products that can replace the primary batteries that have been standardized in GB/T8897.2 (IEC 60086-2).

With the rapid development of the charge and discharge control technology of the lithium ion battery, a method of performing charge and discharge control on the lithium ion battery by a charge and discharge control circuit and then performing voltage stabilization discharge by converting the voltage of the lithium ion battery into the required voltage by a DC-DC (direct current-direct current) conversion circuit is adopted to form a secondary chargeable battery compatible with GB/T8897.2 (IEC 60086-2). The lithium ion secondary rechargeable battery has a plurality of advantages in the aspects of nominal voltage compatibility, discharge voltage stability, charge rate, weight and volume specific energy, charge-discharge memory effect, tolerance, cycle service life and the like.

Such an electronically controlled rechargeable battery, in which a charge and/or discharge control circuit, a DC-DC converter circuit, and a lithium ion battery are packaged as one unit, or in which a charging circuit is packaged in a battery charging case, and in which a discharge control circuit, a DC-DC converter circuit, and a lithium ion battery are packaged as one unit, has been widely accepted in the consumer market of batteries at present, and is gradually replacing electrochemical rechargeable batteries such as a conventional nickel-metal hydride battery.

In the market of consumer rechargeable batteries, the method improves the absolute energy storage and volumetric specific energy of the rechargeable batteries, reduces the cost of the rechargeable battery products, is always the main direction of market demands, is also the technical development direction of the rechargeable battery products, and is also the technical development direction of the electrically-controlled rechargeable battery products.

The current packaging method of the lithium ion rechargeable battery basically adopts a method that a discharge control circuit or a charge-discharge control circuit and a DC-DC transduction circuit are integrated in a controller, and then the controller and a lithium ion battery core are packaged into a whole to form the lithium ion rechargeable battery. The controller is overlapped at the positive end or the negative end of the battery cell, and the total height of the controller and the battery cell forms the total height of the battery. Since the total height and diameter of the columnar battery are defined by GB/T8897.2 (IEC 60086-2), the height of the controller can only be compressed to increase the volume of the battery cell and thus the absolute energy storage capacity of the battery cell.

The thinning controller is characterized in that part of functional circuits in the controller are omitted, so that the purposes of simplifying the structure of the controller and thinning the height of the controller are achieved. However, this approach may lead to reduced battery functionality and potential safety hazards, causing the battery to overheat or even explode. And various functional circuits are integrated in the controller, so that the defects of complex structure of the control circuit, large volume of the controller and the like are caused. On the premise of ensuring complete functions of a control circuit, the manufacturing cost of the controller is reduced as much as possible, the axial height of the controller is thinned, and the absolute electric energy storage capacity of the battery cell is improved, so that the problem to be overcome is urgent in the industry.

The battery can be divided into two types according to the position of the controller packaged in the battery, one controller is packaged at the positive terminal of the battery, and the other controller is packaged at the negative terminal of the battery. The controller packaged at the positive terminal typically includes a circuit board and a positive electrode cap, and the controller packaged at the negative terminal typically includes a circuit board and a negative electrode cap, both of which need to be secured to and electrically connected to the circuit board by soldering.

The positive electrode cap or the cap peak of the negative electrode cap is usually provided with a pin, the circuit board is provided with pin holes for the pin to be inserted, the periphery of the back of the circuit board corresponding to the pin holes is provided with pin pads, and after the pin is inserted into the circuit board, the pin is welded with the pin pads on the back of the circuit board through a spot welding process. On the other hand, the electrode cap of the pin structure occupies the space on the back of the circuit board, so that pin holes and pin pad positions have to be vacated on the back of the circuit board, and in order to avoid short circuit between the pin and other components, the pin pad must be away from other components by a certain distance, so that the arrangement space of other components is seriously insufficient, and therefore, some functional component devices have to be omitted or the components are arranged on the front of the circuit board to heighten the axial total height of the controller, thereby affecting the battery capacity.

How to improve the welding efficiency, reduce the battery cost and improve the absolute storage energy and the volumetric specific energy of the battery is a difficult problem to be overcome.

Disclosure of Invention

The present disclosure is directed to a battery controller having a low cost and a small thickness, which can increase the absolute storage energy and the volumetric specific energy of a secondary battery.

According to an aspect of the present disclosure, there is provided a battery controller including:

The circuit board comprises a first surface and a second surface which are opposite, wherein the second surface is welded with a circuit component;

The electrode cap is made of conductive metal, and is welded on the first surface of the circuit board in a surface mounting mode, an electrode cap bonding pad used for welding the electrode cap is arranged on the first surface of the circuit board, and a channel is formed in the electrode cap bonding pad.

Optionally, the number of the channels is one, the electrode cap pad is in a notch ring broken by the channels, and the electrode cap at least partially covers the channels and the electrode cap pad.

Optionally, the channel divides the electrode cap pad into at least two pad partitions, each of which is symmetrically distributed with respect to a center.

Optionally, the channel is S-shaped, and the electrode cap pad is divided into two pad partitions distributed in a central symmetry manner by the channel.

Optionally, each channel is distributed in a converging state from the peripheral to the central direction of the circuit board, and the electrode cap covers the channel and the pad partition.

Optionally, the number of the pad partitions is more than two, each pad partition encloses an annular area concentric with the outer contour of the electrode cap, the pad partitions are fan-shaped, and each pad partition is symmetrically distributed by taking the vertical middle division plane of the circuit board as the symmetrical plane.

Optionally, the electrode cap is a hollow electrode cap with an inner cavity, and comprises a cylindrical cap body with one end open and a cap peak arranged at the periphery of the open end of the cap body, wherein the open end of the electrode cap faces the circuit board.

Optionally, the area of the cap body covering the circuit board is a cap body coverage area, the area of the cap peak covering the circuit board is a cap peak coverage area, the outer contour of each pad partition is located within the outer contour of the cap peak coverage area, and at least one inner contour of the pad partition extends inwards into the cap body coverage area beyond the cap peak coverage area.

Optionally, the circuit board is provided with a glue injection hole and an exhaust overflow hole, the glue injection hole and the exhaust overflow hole are distributed in the cover area of the cap body, and the inner cavity of the electrode cap is filled with heat-conducting glue through the glue injection hole.

Optionally, the electrode cap is a solid wafer or a solid cylinder.

Optionally, the channels are straight channels, central angles formed between adjacent channels are equal, the pad partitions are uniformly and equi-large distributed on the circuit board, the electrode caps are positive electrode caps or negative electrode caps, the channels are intersected at the center of the circular circuit board, the extending direction of the channels is consistent with the radius direction of the circuit board, and the pad partitions are fan-shaped.

Optionally, the battery controller only has one circuit board, and the circuit components are distributed on the second surface of the circuit board only, or are distributed on the second surface of the circuit board and the part of the first surface of the circuit board covered by the electrode cap at the same time.

Optionally, the battery controller further comprises a controller housing having an inner cavity, and the circuit board is accommodated in the inner cavity of the controller housing.

Optionally, the controller casing includes the controller shell body of metal material, the one end of controller shell body has limit baffle, and the other end is bottomless tubular open end, the through-hole is seted up at limit baffle center, the electrode cap warp limit baffle's through-hole stretches out, the circuit board first surface be close to outer fringe department and be provided with the shell pad, the circuit board passes through shell pad laminating welding or crimping in limit baffle's inner face and with limit baffle's inner face electric connection.

Optionally, the controller shell further comprises a metal controller inner shell coaxial with the controller outer shell and mounted on the second surface of the circuit board, the controller inner shell is accommodated in the controller outer shell, the controller inner shell comprises an annular inner side wall, an inner shell bonding pad is arranged on the second surface of the circuit board, close to the outer edge, the outer shell bonding pad on the first surface of the circuit board is electrically connected with the inner shell bonding pad on the second surface of the circuit board through a circuit board through hole, and one end of the controller inner shell is welded to the inner shell bonding pad.

Optionally, the controller inner shell further includes a supporting portion formed at one end of the inner sidewall and bent toward the central axis direction of the inner sidewall, an arc chamfer is formed between the supporting portion and the inner sidewall of the inner shell, the arc chamfer forms a transition portion, and a gap for stacking solder is formed between the transition portion and the outer sidewall, and between the transition portion and the inner shell bonding pad of the circuit board.

Optionally, the supporting part includes forming in inside wall one end and along a plurality of spacing bent feet of inside wall circumference distribution, each spacing bent foot is mutual interval, forms the recess between the adjacent spacing bent foot, each spacing bent foot keep away from the inside wall one end towards inside wall axis direction bending, each spacing bent foot's top forms the plain in the junction surface of inner shell pad.

Optionally, the support part includes a fixing ring formed at one end of the inner sidewall and bent and extended toward a center direction of the inner sidewall, the fixing ring is fixed to the circuit board through the inner case pad, and a gap is formed between the fixing ring and the controller outer case.

Optionally, the controller further includes an inner electrode for connecting the battery cell, the inner electrode is made of conductive metal, the inner electrode includes an inner electrode fixing portion fixed and electrically connected to the circuit board, the inner electrode further includes an inner electrode battery cell welding table bent relative to the inner electrode fixing portion and formed for electrically connecting the battery cell, two opposite ends of the controller housing are respectively provided with an opening, the electrode cap is exposed to the controller housing through one of the through holes, and the inner electrode battery cell welding table is exposed to the controller housing through the other opening.

Optionally, only one end of the inner electrode is fixed on a circuit board to form one inner electrode fixing part, and the other end of the inner electrode is a movable end forming the inner electrode electric core welding table, and the movable end is not connected with the circuit board.

Optionally, the inner electrode cell welding table is integrally formed with the inner electrode fixing part, the inner electrode fixing part comprises an inner electrode positioning pin which can be inserted and welded on the circuit board and an inner electrode circuit board welding table which is flatly attached to the surface of the circuit board, the circuit board is provided with an inner electrode positioning hole for the inner electrode positioning pin to be inserted and an inner electrode bonding pad which is flatly attached to the inner electrode circuit board welding table and is welded with the inner electrode positioning pin, and the inner electrode bonding pad surrounds the periphery of the inner electrode positioning hole, so that the inner electrode positioning pin of the inner electrode fixing part and the inner electrode circuit board welding table share the same bonding pad.

Optionally, the number of the inner electrode positioning pins is two, the inner electrode circuit board welding table is located between the two inner electrode positioning pins, and the inner electrode circuit board welding table is provided with a groove-shaped through hole penetrating through the inner electrode circuit board welding table in the thickness direction.

Optionally, the inner electrode positioning hole penetrates through the first surface and the second surface of the circuit board, the inner electrode positioning hole is exposed out of the electrode cap and the controller shell, the battery controller further comprises an electrode cap insulating sheet sleeved on the electrode cap, a through hole is formed in the center of the electrode cap insulating sheet, the electrode cap is exposed out of the electrode cap insulating sheet through the through hole, and the electrode cap insulating sheet covers the inner electrode positioning hole.

Optionally, the inner electrode electric core welding table is formed by integrally extending the inner electrode fixing part, bending the inner electrode fixing part for the first time, and then reversely bending the inner electrode electric core welding table for the second time, wherein the first bending of the inner electrode electric core welding table forms a first contact piece, the second bending of the inner electrode electric core welding table forms a second contact piece, and the second contact piece and the first contact piece are mutually overlapped.

Optionally, the inner electrode cell welding table is formed by integrally extending the inner electrode fixing part and then bending the inner electrode fixing part once.

Optionally, the inner cavity of the controller shell is filled with heat-conducting glue, the inner electrode cell welding table is exposed outside the heat-conducting glue, the heat-conducting glue submerges circuit components on the second surface of the circuit board, and at least one part of the inner electrode cell welding table is exposed by the controller shell.

Optionally, the surface of heat-conducting glue covers the inner electrode insulating piece that has insulating material, the inner electrode electric core welding bench is located outside the inner electrode insulating piece, the resistance welding resistance groove that runs through its thickness direction is seted up on the inner electrode electric core welding bench, the inner electrode insulating piece corresponds inner electrode fixed part department has seted up dodges the groove.

According to another aspect of the present disclosure, there is provided a cylindrical secondary battery including:

a cylindrical battery cell having a positive electrode and a negative electrode, and

And the battery controller is coaxially overlapped at the positive electrode end or the negative electrode end of the battery cell and is packaged with the battery cell into a whole.

Optionally, the battery controller further includes a controller housing having an inner cavity, the circuit board is accommodated in the inner cavity of the controller housing, the electrode cap is exposed out of the controller housing, the second surface of the circuit board is further electrically connected with an inner electrode, the inner electrode is made of a conductive material and has an inner electrode cell welding table exposed out of the controller housing, and the inner electrode cell welding table is welded and electrically connected with a positive electrode or a negative electrode of the cell.

Optionally, the battery cell is a soft package battery cell, a negative electrode plate arranged at one end of the battery cell is a negative electrode plate, the negative electrode plate extends from one end to the other end of the battery cell, the battery cell is sleeved into a battery shell, the negative electrode plate is connected with the battery shell in a welding way, and the controller shell is connected with the battery shell;

the positive electrode plate arranged at the other end of the battery cell is connected with the internal electrode battery cell welding table of the battery controller.

Optionally, the shell of the battery cell is a steel shell, the steel shell of the battery cell is a negative electrode of the battery cell, and the controller shell is connected with the steel shell;

the battery cell is provided with a positive electrode boss, the positive electrode of the battery cell is connected with the positive electrode boss, and the positive electrode boss is connected with the internal electrode battery cell welding table of the battery controller.

Optionally, the battery cell is a soft package battery cell, the positive electrode plate arranged at one end of the battery cell is a positive electrode plate, the positive electrode plate extends from one end to the other end of the battery cell, the battery cell is sleeved into a battery shell, the positive electrode plate is connected with the battery shell in a welding way, and the controller shell is connected with the battery shell;

the negative electrode plate arranged at the other end of the battery cell is a negative electrode plate, and the negative electrode plate is connected with an internal electrode battery cell welding table of the battery controller.

Optionally, the shell of the battery cell is an aluminum shell, the aluminum shell of the battery cell is a positive electrode of the battery cell, and the controller shell is connected with the aluminum shell;

One end of the battery cell is provided with a negative electrode boss, the negative electrode of the battery cell is connected with the negative electrode boss, and the negative electrode boss is connected with an internal electrode battery cell welding table of the battery controller.

The columnar secondary battery and the battery controller have the technical effects that:

The positive electrode cap is welded and fixed by using the PCB patch and the hot air reflow soldering process, and the space of the circuit board is saved by using the mode that the single end of the internal electrode is connected with the circuit board, so that circuit components can be distributed on one side of the circuit board, the overall height of the charge-discharge controller is reduced, a larger space is reserved for a battery cell, the capacity of the battery cell is improved, and the volumetric specific energy of the rechargeable battery is further improved.

The cooperation of controller shell body and controller inner shell body has improved the structural strength of charge-discharge controller, has also improved the whole electromagnetic shield effect of controller.

The structure and the process design of mounting and fixing the positive electrode cap by using the PCB patch and the hot air reflow soldering process, designing the electronic components on one side of the circuit board, using the single-ended connection circuit board for the internal electrode and folding at the later stage simplify the structure and the manufacturing process of the charge-discharge controller, and reduce the material cost and the manufacturing cost of the charge-discharge controller.

The packaging method of pouring the heat-conducting glue into the controller is adopted, so that the heat dissipation rate of a circuit board control circuit is improved, the temperature difference between the inside and the outside of the controller is reduced, the control precision of the charge and discharge temperature is improved, the structural strength of the controller is improved, the structural sealing of the controller is realized, and the adaptability and the reliability of the charge and discharge working environment of the secondary battery are improved.

The positive electrode cap is installed and fixed by using the PCB patch and the hot air reflow soldering process, and the circuit components are designed on one side of the circuit board, so that the thick film of the circuit board is easier to realize, the manufacturing process is simplified, and the cost is reduced.

Drawings

Fig. 1 is an external view of a cylindrical secondary battery shown in example 1;

Fig. 2 is an assembled state diagram of the battery controller and the steel case cell of embodiment 1;

fig. 3 is an exploded view of the battery controller of example 1;

Fig. 4 is an assembled state diagram of the positive electrode end cap and the circuit board in the battery controller of embodiment 1;

fig. 4a is a first surface view of a circuit board in the battery controller of embodiment 1;

Fig. 5 is an assembled state diagram of the internal electrode and the circuit board in the battery controller of embodiment 1;

fig. 6 is an assembled state diagram of the circuit board and the controller outer case in the battery controller of embodiment 1;

fig. 7 is an assembled state diagram of the battery controller inner case and the controller outer case of embodiment 1;

fig. 8 is a state diagram of the battery controller of example 1 without glue injection;

fig. 9 is a state diagram of the battery controller of example 1 after glue injection;

Fig. 10 is an assembled state diagram of an internal electrode insulating sheet of the battery controller of embodiment 1;

fig. 11 is a view showing the construction of the internal electrode operation state of the battery controller of embodiment 1;

Fig. 12 is an assembled state diagram of an electrode cap insulating sheet of the battery controller of embodiment 1;

FIG. 13 is a cross-sectional view of the battery controller of example 1 taken along the direction of the central axis;

Fig. 14 is an assembled state diagram of a controller and a battery cell of the cylindrical secondary battery shown in embodiment 2;

fig. 15 is an exploded view of the battery of example 2;

Fig. 16 is an exploded view of the battery controller of example 2;

fig. 17 is an assembled state diagram of the internal electrode and the circuit board in the battery controller of embodiment 2;

fig. 18 is an assembled state diagram of the internal electrode insulation sheet of the battery controller of embodiment 2;

fig. 19 is a working state diagram of the controller of example 2 after bending the inner electrode;

Fig. 20 is a cross-sectional view of the battery controller of example 2 taken along the direction of the central axis;

Fig. 21 is an assembled state diagram of the controller and the battery cell of the cylindrical battery shown in embodiment 3;

Fig. 22 is an exploded view of the battery controller of example 3;

fig. 23 is an assembled state diagram of the positive electrode cap and the circuit board in the battery controller of embodiment 3;

Fig. 24 is a structure of the first surface of the circuit board in the battery controller of embodiment 3;

Fig. 25 is an assembled state diagram of the internal electrode and the circuit board in the battery controller of embodiment 3;

fig. 26 is a state diagram of the battery controller of example 3 after glue injection;

Fig. 27 is a view showing the construction of the internal electrode operation state of the battery controller of embodiment 3;

Fig. 28 is an assembled state diagram of a controller and a battery cell of the cylindrical secondary battery shown in embodiment 4;

fig. 29 is an assembled state diagram of the inner electrode in the battery controller of embodiment 4;

Fig. 30 is a state diagram of the battery controller of example 4 after glue injection;

Fig. 31 is a view showing the construction of the internal electrode operation state of the battery controller of embodiment 4;

fig. 32 is an outline view of the cylindrical secondary battery shown in example 5;

fig. 33 is an exploded view of the battery controller of example 5;

fig. 34 is an assembled state diagram of the negative electrode cap and the circuit board in the battery controller of embodiment 5;

Fig. 35 is a cross-sectional view of the battery controller of example 5 taken along the direction of the central axis;

Fig. 36 is an outline view of the columnar secondary battery shown in example 6;

fig. 37 is a cross-sectional view of the battery controller of example 6 taken along the direction of the central axis;

fig. 38 is an assembled state diagram of the cylindrical secondary battery shown in example 7;

FIG. 39 is a solder diagram of the controller circuit board and electrode cap of example 7;

fig. 40 is an assembled state diagram of the positive electrode cap and the circuit board of embodiment 7;

fig. 41 is a cross-sectional view of the battery controller of example 7 taken along the direction of the central axis;

Fig. 42 is an outline view of the cylindrical secondary battery shown in example 8;

FIG. 43 is a solder diagram of the controller circuit board and electrode cap of example 8;

fig. 44 is an assembled state diagram of the negative electrode cap and the circuit board of embodiment 8.

The reference numerals are explained as follows:

Batteries 100a, 100b, 100c, 100d, 100e, 100g, 100h;

The cells 200a, 200b, 200c, 200d, 200e, 200g, 200h;

cell positive electrodes 230a, 230b, 230c, 230d, 230e;

cell negative electrodes 220a, 220b, 220c;

cell insulating sheets 233a, 233g;

Circuit boards 300a, 300b, 300c, 300d, 300e, 300f, 300g, 300h;

glue injection holes 301a, 301c;

exhaust overflow holes 302a, 302c;

Inner electrode positioning holes 303a, 303c;

Electrode cap pads 310a, 310c, 310e, 310f, 310g, 310h;

Pad areas 311a, 311c, 311e, 311g, 311h;

Inner electrode pads 312a, 312c;

a case pad 313a;

inner shell pads 314a, 314c;

Passages 316a, 316c, 316e, 316g, 316h;

the cap body covers the outer contour 318a;

the cap bill footprint outline 317a;

Positive electrode caps 320a, 320b, 320c, 320e, 323g, 320h;

Negative electrode caps 320e, 320h;

caps 321a, 321e;

the visors 322a, 322e;

Inner electrodes 330a, 330b, 330c, 330d, 330e, 330f, 330g;

inner electrode fixing portions 331a, 331b, 331c, 331d, 331e;

bending positioning groove 332a;

Inner electrode positioning pins 3311a, 3311c;

an inner electrode circuit board soldering station 3312a;

an open slot 3313c;

Resistance welding flow blocking grooves 333a;

inner electrode cell pads 334a, 334b, 334c, 334e;

A positioning foot support 335a;

controllers 400a, 400b, 400c, 400d, 400g;

Controller outer cases 410a, 410b, 410c, 410d, 410e, 410f, 410g;

an outer sidewall 411a;

limit stops 412a, 412b;

Inner positioning ring 413a

Through hole 4112a;

controller inner housings 420a, 420b, 420c, 420d, 420e, 420f, 420g;

an inner sidewall 421a;

An outer positioning ring 423b;

a support portion 422a;

A spacing leg 4221a;

A recess 4222a;

A transition 4422a;

The heat conductive glue 430a, 430b;

inner electrode insulating sheets 440a, 440b, 440c, 440d, 440e, 440f, 440g;

electrode cap insulating sheets 450a, 450b, 450c, 450e, 450f, 450g;

Detailed Description

While this invention is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the disclosure and is not intended to limit the invention to that as illustrated.

Thus, rather than implying that each embodiment of the present invention must have the characteristics described, one of the characteristics indicated in this specification will be used to describe one of the embodiments of the present disclosure. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

In the embodiment shown in the drawings, indications of orientation (such as up, down, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the description of the position of these elements changes, the indication of these directions changes accordingly.

The plural fingers in the present invention include two or more, and include the number.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments may be embodied in many different forms and should not be construed as limited to the examples set forth herein, but rather, the example embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.

Before describing various embodiments of the present application, a brief overview of some of the cell names, terms of art, and cell classifications that may be present in the present application will be presented.

For convenience of description, the application divides the batteries into two types of N-type batteries and P-type batteries according to the system integration mode of the controller in the battery, wherein the controller is matched with the lithium ion columnar secondary battery (note that the N-type batteries and the P-type batteries belong to the application for convenience of description.

An N-type battery, i.e., a battery controller is mounted at the positive electrode end of the battery. The battery shell body is a battery charge input and discharge output negative electrode, and the positive electrode cap is a battery charge input and discharge output positive electrode.

The P-type battery, i.e., the battery controller is installed at one end of the negative electrode of the battery. The battery shell body is a positive electrode for battery charging input and discharging output, and the negative electrode cap is a negative electrode for battery charging input and discharging output.

The application relates to a No. 5 battery and a No. 7 battery, which are popular specification names in China, and the comparison tables of the No. 5 battery and the No. 7 battery with other specification standards are as follows:

the application relates to a battery with built-in charge and discharge protection circuits, which is called a battery with commodity property, and a battery without built-in charge and discharge protection circuits, which belongs to industrial semi-finished products, is called a battery core.

In the embodiment statement, the battery is divided into a steel shell lithium ion battery cell, a soft package lithium ion battery cell, an aluminum shell lithium ion battery cell and the like according to the packaging method of the battery cell, wherein:

the soft package lithium ion cell belongs to the quoted noun and is derived from the short name of a single lithium ion battery which is packaged by an aluminum plastic film and does not have a built-in charge and discharge protection circuit and is known in the lithium ion battery industry.

The steel shell lithium ion battery core belongs to a quoted noun and is derived from the short name of a single lithium ion battery which is packaged by adopting a metal steel shell and is not provided with a built-in charge and discharge protection circuit, and is known in the lithium ion battery industry.

The application relates to an aluminum shell lithium ion battery core, which belongs to a self-created proper abbreviated term for convenience in statement, and refers to a single lithium ion battery which is packaged by adopting a metal aluminum shell and is not provided with a built-in charge and discharge protection circuit.

Statement regarding positive and negative electrodes of cells:

in the lithium ion battery industry, a sheet-shaped extraction electrode which is welded on an anode or a cathode current collector of a lithium ion battery core is generally called a 'tab', even if the tab is extracted outside a battery core packaging body and even is switched to other materials, the electrode is still habitually called a 'tab' as long as the electrode is still in a sheet-shaped structure, such as a positive electrode tab and a negative electrode tab of a soft package lithium ion battery core;

For the convenience of understanding by the well-known professional concepts and for the convenience of description of the implementation method, the lithium ion battery cell winding core extraction electrode, the soft package lithium ion battery cell extraction electrode and the steel shell lithium ion battery cell extraction electrode are all called as positive electrodes or negative electrodes according to the electric polarities of the aluminum shell lithium ion battery cell extraction electrodes.

Preferred embodiments of the present invention will be further elaborated below with reference to the drawings of the present specification.

Example 1, n-type No. 5 steel-shell lithium ion secondary battery.

Referring to fig. 1 and 2, the battery 100a mainly includes a battery cell 200a and a controller 400a. The cell 200a is cylindrical and has a cell positive electrode 230a and a cell negative electrode 220a. The controller 400a is coaxially stacked at the end of the positive electrode 230a of the battery cell and is packaged with the number 5 steel shell battery cell 200a into a whole.

The battery cell 200a in this embodiment is a CID battery cell, i.e. a battery cell with a current cut-off protection structure, when the battery cell fails (such as overheating, short circuit, overcharge, etc.), a lot of gas will be generated inside, and when the pressure increases, the inside of the battery cell will be automatically opened, thus playing a role in protection.

The outer casing of the battery cell 200a is a steel casing, and the internal structure of the battery cell is not a technical problem that is mainly solved by the present invention, so descriptions are omitted.

The positive electrode 230a of the steel shell cell of No. 5 is provided with a positive electrode boss electrically connected with the positive electrode 230a, the positive electrode boss is sleeved with a cell insulating sheet 233a, the center of the cell insulating sheet 233a is provided with a through hole, the cell insulating sheet 233a is positioned by taking the positive electrode boss as the center through the through hole and matched with the positive electrode boss, and is stuck on the shell of the cell 200a, and when the controller 400a is welded on the cell 200a, the cell insulating sheet 233a plays a role in isolating the cell positive electrode 230a from the controller shell. The technical problem to be solved by the present invention is basically partially developed around the controller 400a, and will be described in detail with reference to the accompanying drawings.

Referring to fig. 3,4 and 4a, the controller 400a of the present embodiment mainly includes a circuit board 300a and a positive electrode cap 320a disposed on the circuit board 300 a.

The circuit board 300a has opposite first and second surfaces, and the positive electrode cap 320a is disposed on the first surface of the circuit board 300a, and the second surface of the circuit board 300a is provided with various circuit components for implementing the controller function.

The positive electrode cap 320a is soldered to the first surface of the circuit board by means of a chip, the first surface of the circuit board 300a is provided with an electrode cap pad 310a for soldering the positive electrode cap 320a, the circuit board 300a has a plurality of channels 316a thereon, and the channels 316a divide the electrode cap pad into a plurality of pad areas 311a. The channel 316a herein refers to a non-welded structure that is not available for welding. The simplest way to form the channels is to arrange mutually spaced pad sections on the circuit board, the spacing between the pad sections constituting the channels 316a. The space can also be coated with insulating solder resist ink or other insulating material layers to form a channel. Alternatively, the surface of the channel is lower than the height of the surface of the pad section 311a, or both may be equal.

The electrode cap pad 310a electrically connects a charge input terminal and a discharge output terminal of the control circuit of the circuit board 300 a. After the positive electrode cap 320a is welded and fixed to the electrode cap pad 310a of the circuit board 300a and an electrical connection is established, the positive electrode cap 320a becomes a positive electrode for charge input and discharge output of the secondary battery.

Compared with the traditional method of arranging the pins on the electrode cap and welding the pins with the circuit board by inserting the pins into the circuit board, the positive electrode cap surface mounting mode can vacate the space for arranging the pins on the second surface of the circuit board, so that more circuit components can be arranged on the second surface of the circuit board, the circuit components can be only arranged on the second surface of the circuit board, the circuit components are really realized, the overall height of the controller is greatly reduced, and the space is vacated for the electric core.

In addition, the electrode cap pads are designed in a partitioned structure, and channels 316a are formed between adjacent pads, so that when the positive electrode cap is placed on the electrode cap pads in a patch manner and passed through the reflow soldering machine, the gas volatilized by the soldering flux in the solder paste can be diffused out through the channels 316 a. If the electrode cap pad is configured to have no partition and no channel, the positive electrode cap 320a is easily pushed open when the soldering flux of the solder paste on the pad volatilizes, resulting in skew of the positive electrode cap 320 a. Meanwhile, compared with the whole pad without the partition, in the welding process of the circuit board through the reflow soldering machine, the partition structure of the pad can disperse the stress on the surface of the solder paste, and release the stress through the channel 316a, so that the stress on the surface of the molten solder paste on each pad partition 311a is controlled within a certain range, and the drift of the positive electrode cap when the circuit board and the positive electrode cap 320a pass through the reflow soldering machine can be effectively restrained. If the paste is not uniformly applied, excess paste on the pads may be drained to the isolation trenches. Therefore, through the pad partition structure, the positive electrode cap pasted in the PCB board pasting mode can be ensured to be flat and not to be inclined.

The positive electrode cap 320a is made of nickel-plated iron by stamping or other conductive metal materials, so that the positive electrode cap 320a can be welded with the electrode cap bonding pad 310a by adopting a PCB (printed circuit board) patch and hot air reflow soldering process method, and meanwhile, the electrode cap bonding pad 310a can participate in shielding electromagnetic radiation generated by a control circuit of the circuit board 300a, and heat generated by the control circuit of the circuit board 300a is conducted and dissipated to the outside of the controller. The positive electrode cap 320a is made of nickel-plated iron by press forming or other conductive metal materials, and the structural strength and oxidation resistance of the positive electrode cap 320a can also meet the structural technical conditions of the rechargeable battery as the charging input and discharging output positive electrode.

Alternatively, the number of the channels 316a is preferably three or more, and the channels 316a divide the electrode cap pad 310a into a plurality of pad sections 311a, and each pad section 311a is symmetrically distributed with respect to a center. So that the positive electrode cap 320a will be automatically centered during solder reflow, avoiding solder reflow misalignment.

In this embodiment, each channel 316a is a straight channel, and is distributed in a converging manner from the outer periphery to the center of the circuit board 300 a. When the channel 316a is designed, the virtual center of the channel convergence is located at a preset position of the center of the positive electrode cap 320a, so that the channel 316a has a centering effect on the center of the positive electrode cap 320a when the positive electrode cap 320a passes through the reflow soldering machine, the center of the positive electrode cap 320a is automatically guided to the preset position, the positive electrode cap 320a is ensured to be accurately positioned on the circuit board 300a, and reflow soldering offset is avoided.

The positive electrode cap 320a of the present embodiment is a hollow electrode cap having an inner cavity, and includes a cylindrical cap body 321a having one end opened and a cap peak 322a provided in the circumferential direction of the opening end of the cylindrical cap body. The cap body 321a includes a cylindrical cap wall and a cap top closed at one end of the cap wall, the cap peak 322a is perpendicular to the cap wall of the cap body 321a, the positive electrode cap 320a is inversely fastened to the circuit board 300a with its open end toward the circuit board 300a, and is soldered to the circuit board 300a by the cap peak 322a, and when the positive electrode cap 320a is soldered to the circuit board 300a, the cap peak 322a of the positive electrode cap 320a covers the pad partitions 311a and the channels 316a. Each pad segment 311a is distributed as an annular region with a center concentric with the annular cap peak 322a of the positive electrode cap 320a, so that each pad segment 311a has a centering effect with the cap peak of the positive electrode cap 320a when passing through the reflow soldering machine, ensuring that the positive electrode cap 320a does not drift.

When the circuit functions are so many that the single-sided circuit component cannot be realized on the second surface of the circuit board, the circuit component can be arranged in the inner cavity of the positive electrode cap 320a, so that the overall height of the controller is controlled in an extremely low range, and space is reserved for the battery cells.

Alternatively, the bill 322a is not in an equal-sized relationship with the electrode cap pads on the circuit board 300 a. The area of the cap 321a covering the circuit board is a cap coverage area (318 a in the figure is the outer contour of the cap coverage area), and the area of the cap brim covering the circuit board is a cap brim coverage area (317 a in the figure is the outer contour of the cap brim coverage area). The cap body covering area 318a is provided with a pad blank area, the outer contour of each pad partition 311a is positioned in the cap peak covering area outer contour 317a, namely, the outer diameter of the pad partition 311a is smaller than the diameter of the cap peak covering area outer contour 317a, and the structure can further inhibit the positive electrode cap 320a from drifting when the circuit board 300a and the positive electrode cap 320a pass through a reflow soldering machine. The inner contour of the at least one pad section 311a extends inwardly beyond the cap bill footprint, i.e., into the cap bill footprint outer contour 318a, so that as the circuit board 300a and the positive electrode cap 320a pass through the reflow soldering machine, the melted solder paste can climb up the cap wall of the positive electrode cap 320a, thereby increasing the soldering strength between the positive electrode cap 320a and the circuit board 300 a.

In this embodiment, the circuit board 300a is circular, the positive electrode cap peak 322a is an annular cap peak, the electrode cap pad is an annular pad, and the pad areas are sector-shaped. Therefore, from the view, the outer diameter of the electrode cap pad ring structure is smaller than the outer diameter of the positive electrode cap peak 322a, and the inner diameter of the electrode cap pad ring structure is smaller than the inner diameter of the positive electrode cap peak 322 a.

Optionally, central angles formed between adjacent channels 316a are equal, that is, central angles of the fan-shaped pad partitions 311a are equal, so that the channels 316a are uniformly distributed on the circuit board, and gas volatilized by soldering flux in solder paste during reflow soldering can be uniformly diffused through the uniformly distributed channels 316a, so that the positive electrode cap is prevented from drifting.

Optionally, the pads are uniformly and equally distributed on the circuit board in a partitioned manner, so that the surface stress of the solder paste of the electrode cap pad is more uniform, and the electrode cap is prevented from being skewed.

The vertical bisection plane of the circuit board is defined as a vertical plane passing through the center of the circuit board and perpendicular to the circuit board. Optionally, the pad partitions 311a of the embodiment are symmetrically distributed with the vertical middle partition plane of the circuit board as the symmetrical plane, so that solder paste stress on the surface of each pad partition 311a is uniformly distributed, and concentricity of the positive electrode cap and the circuit board 300a is improved.

The circuit board 300a is further provided with a glue injection hole 301a and an exhaust overflow hole 302a, and the glue injection hole 301a and the exhaust overflow hole 302a are distributed in the outer outline 318a of the cap body coverage area of the positive electrode cap 320a, so that the inner cavity of the positive electrode cap 320a can be filled with heat-conducting glue through the glue injection hole 301a, and the heat dissipation performance of the circuit board 300a is improved. The exhaust overflow hole 302a is used for exhausting air during the process of pouring the heat-conducting glue, and overflows to the second surface of the circuit board 300a after the cavity formed by the first surface of the circuit board 300a and the positive electrode cap 320a is filled with the heat-conducting glue. In addition, before the injection, during reflow soldering, the positive electrode cap 320a is expanded by heating the gas in the cavity formed by the positive electrode cap 320a and the first surface of the circuit board 300a due to the temperature rise, and the expanded gas can be discharged through the injection hole 301a and the exhaust overflow hole 302a to balance the gas pressure inside and outside the cavity formed by the positive electrode cap 320a and the first surface of the circuit board 300a, so as to avoid the distortion of the expanded gas of the positive electrode cap 320a when the circuit board 300a and the positive electrode cap 320a pass through the reflow soldering machine.

Referring to fig. 3-8, the controller 400a further includes a controller housing having an interior cavity, wherein the circuit board is received in the interior cavity of the controller housing.

Alternatively, in the present embodiment, the controller housing includes a controller outer housing 410a. The controller housing 410a is fabricated from nickel plated after iron stamping, but may also be fabricated from other conductive metallic materials.

One end of the controller housing 410a has a limit stop 412a and the other end is a bottomless tubular open end. The controller outer case 410a includes a cylindrical outer side wall 411a and a limit stopper 412a integrally formed at one axial end of the outer side wall 411 a. The limit baffle 412a has a through hole 4112a at the center, and a housing pad 313a for soldering the limit baffle 412a is disposed on the first surface of the circuit board 300a near the outer edge. The circuit board 300a is accommodated in the controller outer case 410a, and the circuit board 300a is adhered and fixed on the inner surface of the limit baffle 412a of the controller outer case 410a by brushing solder paste on the outer case bonding pad 313a, and is electrically connected with the limit baffle 412a. At this time, the positive electrode cap 320a protrudes through the through hole 4112a of the limit shutter 412a. The housing pads 313a not only function to be fixed with the controller housing 410a, but also establish an electrical connection between the controller housing 410a and the circuit board 300a by solder paste soldering, so that the housing pads 313a together with the controller housing 410a participate in shielding electromagnetic radiation generated by the controller 400 a.

In this embodiment, the housing pad 313a is an annular pad, which is beneficial to increasing the contact area of the electrical connection between the circuit board 300a and the controller housing 410a, and improving the heat dissipation efficiency of the circuit board 300a through high current. In other embodiments, there may be a plurality of pads distributed on the first surface of the circuit board 300a near the outer edge.

Optionally, the controller housing further includes a controller inner housing 420a disposed in the controller outer housing 410 a.

The controller inner housing 420a is made of nickel plating after iron stamping, or other conductive metal materials.

The controller inner housing 420a is coaxially mounted within the controller outer housing 410 a. The controller inner case 420a includes an annular inner sidewall 421a coaxial with the outer sidewall 411a of the controller outer case 410a, and an inner case pad 314a for soldering the controller inner case 420a to the second surface of the circuit board 300a is provided near the outer edge of the second surface of the circuit board 300 a. The outer shell pads 313a of the first surface of the circuit board 300a are electrically connected to the inner shell pads 314a of the second surface of the circuit board 300a through the circuit board vias. In mounting, solder paste may be applied to the inner housing pads 314a of the circuit board 300a, and the controller inner housing 420a is then inserted such that one end of the controller inner housing 420a abuts against the inner housing pads 314a of the circuit board 300 a. The circuit board 300a, the controller inner housing 420a, and the controller outer housing 410a may be connected and fixed by directly heating the controller outer housing 410a and soldering.

In this embodiment, the inner shell pad 314a is a ring-shaped pad, and in other embodiments, a plurality of pads distributed on the second surface of the circuit board 300a near the outer edge may be also used.

The controller inner housing 420a can increase the connection strength between the circuit board 300a and the controller outer housing 410a, and can increase the electromagnetic shielding effect of the controller, and increase the electrical contact area between the circuit board 300a and the controller housing, thereby facilitating the passage of large current and improving the heat dissipation efficiency of the circuit board 300 a.

Alternatively, referring to fig. 7 and 13, the controller inner case 420a further includes a supporting portion 442a formed at one end of the inner side wall 421a and bent toward the central axis direction of the inner side wall 421a, and the other end of the controller inner case 420a opposite to the supporting portion 442a is a bottomless tubular open end. An arc chamfer is formed between the supporting portion 442a and the inner sidewall 421a of the controller inner housing, the arc chamfer forms a transition portion 4422a, and a gap for depositing solder is formed between the transition portion 4422a and the outer sidewall 411a, and between the transition portion 4422a and the inner housing pad 314a of the circuit board 300 a.

When the inner controller housing 420a is mounted in the outer controller housing 410a, the supporting portion 442a of the inner controller housing 420a presses the solder paste on the inner housing pad 314a of the circuit board 300a, and presses the solder paste into the gap formed between the inner controller housing 420a, the outer side wall 411a of the outer controller housing and the circuit board 300a, and deposits the solder paste in the gap, so that the three components of the circuit board 300a, the inner controller housing 420a and the outer controller housing 410a are firmly welded.

Specifically, the supporting portion 422a includes a plurality of limiting legs 4221a formed at one end of the inner sidewall 421a and circumferentially distributed along the inner sidewall 421a, each limiting leg 4221a is spaced apart from each other, a groove 4222a is formed between adjacent limiting legs 4221a, one end of the limiting leg 4221a away from the inner sidewall is bent toward the central axis of the inner sidewall to form an arc chamfer, and the top of each limiting leg 4221a forms a connection surface flatly attached to the inner housing bonding pad 314 a.

When the inner controller housing 420a is mounted in the outer controller housing 410a, the connection surface on the top of each limiting leg 4221a presses the solder paste on the inner housing pad 314a of the circuit board 300a, so that the solder paste enters the gap formed between the outer side of the circular arc chamfer of the limiting leg 4221a of the inner controller housing 420a, the outer side wall 411a of the outer controller housing and the circuit board 300a, and in addition, the solder paste is pressed into the gap of the recess 4222a between the adjacent inner controller housing solder pins. Therefore, the circuit board 300a, the controller inner case 420a, and the controller outer case 410a can be firmly welded.

In addition, the diameter of the circuit board 300a is slightly smaller than the diameter of the inner cavity of the controller outer case 410a, a gap is formed between the outer periphery of the circuit board 300a and the outer side wall 411a of the controller outer case 410a, and the excessive solder paste between the first surface of the circuit board 300a and the limit baffle 412a of the controller outer case 410a is extruded into the gap, and is fused and bonded with the solder paste on the second surface of the circuit board and the solder paste accumulated in the gap into a whole, so as to form a firm bonding mass, thereby further improving the connection strength among the circuit board 300a, the controller inner case 420a and the controller outer case 410 a.

In other embodiments, the spacing legs 4221a may be formed without grooves 4222a, so that each spacing leg 4221a is connected to form a fixing ring, that is, the supporting portion 422a is replaced by a fixing ring formed at one end of the inner side wall and extending in the center direction of the inner side wall, the bending portion of the fixing ring forms an arc chamfer, the fixing ring is fixed to the circuit board 300a through the inner shell bonding pad 314a, and solder paste is deposited through a gap formed between the arc chamfer of the fixing ring and the outer side wall 411a of the controller outer shell 410a, so that the circuit board 300a, the controller inner shell 420a and the controller outer shell 410a are firmly connected.

In other embodiments, instead of solder paste, a tin wire or a tin ball may be used, and the gap or the groove may be filled with fluid tin solder after the tin wire or the tin ball is melted.

The controller housing of the embodiment adopts the mode of clamping and fixing the two sides of the circuit board 300a by the controller inner housing 420a and the controller outer housing 410a, so that the circuit board 300a is firmly fixed, and the circuit board is prevented from collapsing due to actions such as falling and falling in the using process of the battery. Meanwhile, the controller inner shell 420a is of an annular structure, and is only fixedly connected with the circuit board at the periphery of the circuit board 300a, so that the space of the circuit components at the middle part of the circuit board is not occupied, the circuit components are distributed on one side of the circuit board, and the overall height of the controller is controlled in the lowest possible height range. In addition, the double-layer shell structure of the inner shell and the outer shell can also obviously improve the overall electromagnetic shielding resistance effect of the controller, improve the electric contact area of the circuit board 300a and the controller shell, and be favorable for passing large current and improving the heat dissipation efficiency of the circuit board 300 a.

Referring to fig. 13, the outer controller housing 410a extends downward beyond the inner controller housing 420a to form a ring of inner positioning rings 413a, and when the controller 400a is fixed to the battery cell 200a, the outer battery cell housing extends into the inner positioning rings 413a, and the inner positioning rings 413a are used to abut against the outer housing of the battery cell 200, so as to ensure that the controller 400a is concentrically and coaxially mounted with the battery cell 200 a.

It should be noted that, when the controller inner housing 420a and the controller outer housing 410a cooperate together to fix the circuit board 300a, the circuit board 300a may not be welded to the limit stop 412a of the controller outer housing 410a, and the outer housing pad 313a on the first surface of the circuit board 300a is pressed against the inner surface of the limit stop 412a by welding between the controller inner housing 420a and the inner housing pad 314a of the circuit board 300a and welding between the controller inner housing 420a and the controller outer housing 410a, so that the circuit board 300a is press-connected to the limit stop 412a of the controller outer housing 410a and an electrical connection is established therebetween.

Referring to fig. 3 and fig. 5-11, the circuit board 300a is further provided with an inner electrode 330a, and the inner electrode 330a is made of conductive metal. One end of the inner electrode 330a is fixed to and electrically connected to the circuit board 300a to form an inner electrode fixing portion 331a, and the inner electrode 330a further includes an inner electrode cell soldering stage 334a bent with respect to the inner electrode fixing portion 331a to electrically connect the cell 200a, and an accommodating space for arranging circuit components is formed between the bent inner electrode cell soldering stage 334a and the circuit board 300 a. Inner electrode die bonding station the inner electrode die bonding station 334a is exposed to the controller housing through the open ends in the controller and at the bottom of the outer housing.

The inner electrode 330a of the present embodiment is a single-pin structure, that is, only one end of the inner electrode 330a is fixed to the circuit board to form a single fixed end, and the other end of the inner electrode 330a is a movable end not connected to the circuit board 300 a. The movable end of the single-pin type internal electrode 330a is not connected with the circuit board 300a, so that a large space can be made, and more functional components can be arranged on the second surface of the circuit board 300 a.

In other embodiments, if the controller is simple in function, fewer circuit components, or the circuit board 300a is larger in diameter due to the battery model, the inner electrode 330a may be designed in a double-fixing-pin form, i.e., an inner electrode fixing portion 331a is respectively designed at two ends of the inner electrode cell soldering station 334a, so that two ends of the inner electrode cell soldering station 334a are fixed ends.

Specifically, the inner electrode die pad 334a and the inner electrode fixing portion 331a of the present embodiment are integrally formed. The inner electrode fixing portion 331a includes an inner electrode positioning pin 3311a which is inserted and soldered to the circuit board 300a, and an inner electrode circuit board soldering stage 3312a which is flatly attached to the surface of the circuit board. The circuit board 300a is provided with an inner electrode positioning hole 303a into which the inner electrode positioning pin 3311a is inserted, and an inner electrode pad 312a to which the inner electrode circuit board bonding stage 3312a is flatly attached and bonded. The inner electrode pad 312a surrounds the periphery of the inner electrode positioning hole 303a, and the inner electrode positioning pin 3311a of the inner electrode fixing portion and the inner electrode circuit board welding table 3312a share the same inner electrode pad 312a, and the inner electrode positioning pin 3311a is used for tin melting welding, so that the current density at the welding connection position is reduced, and the welding position accuracy of the inner electrode 330a and the circuit board 300a is ensured.

The inner electrode pad 312a serves as a pad for soldering the inner electrode 330a and is also a die positive electrode 230a access pad for control circuitry on the circuit board 300 a. After the inner electrode 330a is welded and fixed to the inner electrode pad 312a of the circuit board 300a and an electrical connection is established, the inner electrode 330a is made to be a structural electrode of the positive electrode of the battery cell 200a connected to the control circuit of the circuit board.

When the inner electrode 330a is soldered, the inner electrode positioning pins 3311a are inserted into the inner electrode positioning holes 303a to position the inner electrode 330a and the circuit board 330 a. In addition, since the inner electrode positioning hole 303a penetrates the first surface and the second surface of the circuit board, and the inner electrode positioning hole 303a is exposed from the positive electrode cap 320a and the limit baffle 412a of the controller housing, when the rechargeable battery is assembled, the inner electrode positioning hole 303a can also be used as a battery cell test hole, and a tip pen is inserted into the inner electrode positioning hole 303a of the first surface of the circuit board, i.e. is in contact with the inner electrode 330 a. This allows for direct electrical connection of the positive electrode of the cell 200a across the controller 400a for detection of the cell.

After the inner electrode 330a is bent and formed, the inner electrode fixing portion 331a further includes two positioning pin supporting portions 335a, the number of the inner electrode positioning pins 3311a is two, the inner electrode fixing portions are respectively disposed at positions near two sides of one end of the positioning pin supporting portions 335a in the width direction and are integrally formed by extending the positioning pin supporting portions 335a, and the inner electrode circuit board welding table 3312a is a welding sheet integrally formed by extending and bending the positioning pin supporting portions 335a, the inner electrode circuit board welding table 3312a is disposed between the two inner electrode positioning pins 3311 a. The inner electrode board land 3312a is provided with a groove-shaped through hole penetrating in the thickness direction thereof. During soldering, solder paste is placed in the slot-type through holes, and when the inner electrode circuit board soldering station 3312a is heated by a soldering iron or other soldering tool, the solder paste melts and extends along the walls of the slot-type through holes, thereby fixing the inner electrode circuit board soldering station 3312a to the circuit board 300a. Meanwhile, the inner electrode circuit board welding table 3312a also increases the contact area between the inner electrode 330a and the circuit board 300a, which is beneficial to passing large current and improving the heat dissipation efficiency of the control circuit.

In addition, the inner electrode positioning pins 3311a of the inner electrode 330a are inserted into the inner electrode positioning holes 303a of the circuit board 300a to position the inner electrode 330a and the circuit board 300a in the xy direction, and the inner electrode circuit board bonding stage 3312a is abutted against the inner electrode pads 312a on the second surface of the circuit board 300a to position the inner electrode 330a and the circuit board 300aZ direction. Meanwhile, the inner electrode circuit board welding table 3312a also increases the contact area of the inner electrode 330a and the circuit board 300a, which is advantageous to reduce the heat generation amount of the connection portion of the inner electrode 330a and the circuit board 300a by a larger current.

Referring to fig. 2 and 5, when the controller 400a is assembled at the positive terminal of the battery cell 200a, the internal electrode cell welding table 334a of the internal electrode 330a just falls on the positive electrode 230a boss of the battery cell, and an electrical connection can be established between the two by welding the two.

The inner electrode cell welding table 334a is further provided with a resistance welding flow blocking groove 333a to increase a current path passing through when the inner electrode cell welding table 334a and the cell positive electrode boss are resistance welded, thereby increasing welding strength.

Because the battery cell 200a of the embodiment is a steel-shell battery cell, the positive electrode 230a thereof has a boss structure, and in order to facilitate welding the internal electrode battery cell welding table 334a with the battery cell 200a, the internal electrode battery cell welding table 334a of the embodiment adopts a two-fold structure.

Referring to fig. 10 and 11, the inner electrode cell welding table 334a is formed by integrally extending the inner electrode fixing portion 331a, bending the inner electrode fixing portion 331a once, and then bending the inner electrode fixing portion reversely and secondarily, wherein the first bending forms a first contact piece, the second bending forms a second contact piece, the second contact piece and the first contact piece overlap each other, and the inner electrode cell welding table 334a is formed at the end of the second contact piece.

The two lateral sides of the inner electrode cell welding table 334a are respectively provided with a bending positioning groove 332a, when the inner electrode cell welding table 334a is bent, stress at the two bending positioning grooves 332a is concentrated, so that the inner electrode cell welding table 334a can be ensured to be folded at the bending positioning grooves, secondary bending positioning is realized by taking the connecting line of the two bending positioning grooves 332a as a folding line, and the folding consistency of the inner electrode is ensured.

The movable end shape of the inner electrode 330a of this embodiment is an elongated shape. Because the battery of this embodiment is a No. 5 battery, the diameter of which is larger than that of the No. 7 battery, and therefore, the diameter of the circuit board is also larger than that of the No. 7 battery, the wider inner electrode 330a and the inner electrode cell welding table 334a can be designed, so that the width of the movable end of the strip-shaped inner electrode 330a can meet the requirement of welding with the positive electrode boss of the cell. The movable end of the elongated inner electrode 330a can save materials, simplify the manufacturing process, and reduce the process cost.

Referring to fig. 8-11, the inner cavity of the controller housing is filled with a heat conductive adhesive 430a made of an insulating material. When the heat-conducting glue is poured, the controller is placed in a vacuum environment in a position with the positive electrode cap facing downwards, the pre-prepared heat-conducting glue is poured into the controller through the glue pouring hole 301a of the circuit board 300a, the heat-conducting glue 430a is filled into an inner cavity formed by the first surface of the circuit board 300a and the positive electrode cap 320a, then overflows to an inner cavity formed by the second surface of the circuit board 300a and the controller outer shell 410a through the exhaust overflow hole 302a, the controller is continuously poured to a position where a glue plane reaches to submerge circuit components on the second surface of the circuit board 300a, the controller is taken out, the solidified heat-conducting glue 430a can protect the circuit components in the controller, and on the other hand, heat generated by a control circuit in the controller is conducted to a main heat-conducting medium of the controller outer shell 410a and the positive electrode cap 320a, so that the heat dissipation efficiency of the controller is improved, the temperature difference between the inside and the outside of the controller is reduced, the control precision of the charging or discharging temperature of the controller is improved, the structural strength of the controller is improved, the structural sealing of the controller is realized, and the charge and discharge working environment adaptability and reliability of a battery are improved.

The heat-conducting glue 430a is a thermosetting glue, and can be prepared by mixing dicyandiamide into epoxy resin to modify the epoxy resin into a single-component thermosetting glue, and then mixing with heat-conducting powder materials such as aluminum nitride or boron nitride to modify the epoxy resin into a heat-conducting glue.

In other embodiments, the heat-conducting glue 430a may be modified by using other colloids such as thermosetting benzoxazine, and other heat-conducting powder materials such as aluminum nitride or boron nitride.

The pouring process of the heat-conducting glue 430a can also be realized by pouring the heat-conducting glue in a normal pressure environment, and putting the heat-conducting glue into a vacuum oven after pouring is finished according to the process methods of heating, pumping bubbles and leveling.

The inner electrode cell soldering station 334a is exposed outside the heat conductive paste 430a, and the movable end of the inner electrode cell soldering station 334a is exposed by an opening at the bottom of the controller housing, so that the electrical connection of the cell 200a is facilitated. The surface of the heat-conducting glue 430a is further covered with an inner electrode insulating sheet 440a made of insulating material, the inner electrode cell welding table 334a is located outside the inner electrode insulating sheet 440a, and an avoidance groove is formed at the position of the inner electrode insulating sheet 440a corresponding to the inner electrode fixing part 331 a. The inner electrode insulating sheet 440a prevents the inner electrode die pad 334a from being bent and then being in contact with and short-circuited with the electronic components on the circuit board 300 a. In addition, the cured heat-conducting glue 430a can also provide positioning for the inner electrode cell welding table 334a, so that the two sides of the suspended inner electrode cell welding table 334a in the axial direction of the controller are blocked by the heat-conducting glue 430a and the cell 200a, and the use state of the controller is kept relatively stable as far as possible.

In implementation, the heat-conducting glue 430a may be poured into the controller, at this time, the heat-conducting glue 430a is in a gel state, the surface is flat, the inner electrode insulating sheet 440a is placed on the gel state glue plane, so as to ensure the flatness of the inner electrode insulating sheet 440a, and then the whole controller is placed into an oven to heat and cure the heat-conducting glue, and the cured heat-conducting glue 430a is tightly adhered to the inner electrode insulating sheet 440a to form an integral body with the whole controller.

The inner electrode insulating sheet 440a may be made of highland barley paper, ABS, PC, PET or other insulating materials.

In other embodiments, the inner electrode insulating sheet 440a may also be manufactured with a back adhesive structure, and then attached to the heat conductive adhesive 430a after the heat conductive adhesive is cured.

Referring to fig. 12, the controller further includes an electrode cap insulating sheet 450a sleeved on the positive electrode cap 320a, a through hole is formed in the center of the electrode cap insulating sheet 450a, the positive electrode cap 320a is exposed out of the electrode cap insulating sheet 450a through the through hole, and the electrode cap insulating sheet 450a covers the cap peak 322a of the positive electrode cap 320a and the outer surface of the limit baffle 412a of the controller outer shell, and covers the inner electrode positioning hole 303a of the first surface of the circuit board, which is used for inserting and connecting the inner electrode 330 a.

The electrode cap insulating sheet 450a may be made of insulating material PC, PET, ABS, and may be provided with a back adhesive, so that it may be adhered to the cap peak 322a of the positive electrode cap 320a and the outer surface of the limit baffle 412a of the controller outer case, so as to ensure insulation between the positive electrode cap 320a and the controller outer case.

Fig. 4 to 12 are assembly sequence diagrams of the controller 400a, when the controller 400a is assembled, firstly, welding each circuit component on the second surface of the circuit board, then welding the positive electrode cap 320 patch on the first surface of the circuit board, then inserting the inner electrode 330a into the inner electrode positioning pin 3311a of the circuit board 300a, welding one end of the inner electrode 330a on the circuit board 300a, then placing the circuit board 300a into the inner cavity of the controller outer shell 410a from the opening end of the controller outer shell 410a, tightly attaching the circuit board 300a to the limit baffle 412a of the controller outer shell 410a, welding the circuit board on the limit baffle 412a through the outer shell pad 313a of the first surface of the circuit board 300a, then installing the controller inner shell 420a into the controller outer shell 410a, enabling the limit pin 4221a of the controller inner shell 420a to prop against the periphery of the second surface of the circuit board, heating the controller, melting solder paste pre-coated on the outer shell pad 313a of the first surface of the circuit board 300a and the inner shell pad 314a of the second surface through the inner shell pad 314a, and then fixing the inner shell pad 334a of the circuit board into the inner shell core wire, and welding the inner shell pad 334a to form the inner electrode 430a, and then fixing the inner electrode 430a to the inner shell surface of the inner shell, and electrically-bending the inner shell, after the inner shell is welded to the inner shell surface of the inner shell and the inner shell is bent, the electrode is welded to the inner electrode 430a, and the inner electrode is welded, the inner electrode is bent, and the inner electrode is bent; then, the electrode cap insulating sheet 450a is placed on the surfaces of the limit baffle 412a and the positive electrode cap peak 322a of the controller outer case 410a through the cap body of the positive electrode cap 320a, and is adhesively connected with the limit baffle 412a and the positive electrode cap peak 322 a.

Referring to fig. 1, when the controller 400a is assembled on the battery cell 200a, the controller outer shell 410a of the controller shell is connected with a steel shell of the outer surface of the battery cell, the steel shell of the battery cell 200a is the negative electrode of the battery cell 200a, and the positive electrode boss is connected with the inner electrode battery cell welding table 331a of the battery controller.

The technical effects of the N-type No. 5 steel-shell lithium ion secondary battery of this embodiment are as follows:

(1) The height of the charge-discharge controller is reduced, and the specific energy of the rechargeable battery is improved.

The positive electrode cap is welded and fixed by using the PCB patch and the hot air reflow soldering process, and the space of the circuit board is saved by using the mode that the single end of the inner electrode is connected with the circuit board, so that circuit components can be distributed on one side of the circuit board, the overall height of the charge-discharge controller is reduced, a larger space is reserved for the steel shell lithium ion battery core with CID, the capacity of the battery core is improved, and the volumetric specific energy of the rechargeable battery is improved.

(2) The cooperation of controller shell body and controller inner shell body has improved the structural strength of charge-discharge controller.

The circuit board is clamped between the outer shell and the inner shell of the controller, and the inner shell of the controller is provided with the supporting part, so that the overall structural strength of the controller is improved, and the overall electromagnetic shielding effect of the controller is also improved.

(3) The structure and the process of the charge-discharge controller are simplified, and the cost of the rechargeable battery is reduced.

(4) And the adaptability and the reliability of the charge and discharge operation of the secondary battery are improved.

(5) The thick film of the circuit board is easier to realize.

Example 2, n type No. 5 soft pack lithium ion secondary battery.

Fig. 14 to 20 are structural diagrams of an N-type No. 5 soft pack lithium ion secondary battery and a controller thereof.

Referring to fig. 14 and 15, the battery 100b includes a battery case 110b, a battery cell 200b, and a controller 400b.

The battery cell 200b of the present embodiment is a soft-pack lithium ion battery cell, and like the above embodiment, is also cylindrical, and has a battery cell positive electrode 230b and a battery cell negative electrode 220b, respectively.

The battery case 110b has a cylindrical structure with one end open and the other end closed. The cell positive electrode 230b is a positive electrode sheet and the cell negative electrode 220b is a negative electrode sheet.

The cell positive electrode 230b is a tab structure with a certain length, and after the cell negative electrode 220b is extended, the end of the cell positive electrode 220b is bent towards the outer shape of the cell.

The battery controller is coaxially stacked on the end of the positive electrode 230b of the battery, and the battery 220b and the controller 400b are packaged into a whole through the battery outer shell 110 b.

When assembled, the battery cell 220b is first sleeved into the battery outer shell 110b with the battery cell negative electrode 220b facing the closed end direction of the battery outer shell 110 b. The cell negative electrode 220b and the cell outer case 110b are welded and fixed at the open end of the cell outer case 110b and electrically connected by a conventional resistance welding or laser welding method, then the inner electrode cell welding table 334a of the inner electrode 330b of the controller 400b is lapped and welded with the cell positive electrode 230b, and finally the case of the controller 400b is welded with the open end of the cell outer case 110b, thereby realizing the battery package.

The design method adopted by the controller matched with the secondary battery formed by the soft-package lithium ion battery core in the embodiment is basically the same as that adopted by the controller matched with the secondary battery formed by the steel shell lithium ion battery core in the embodiment 1. The design method according to the difference of technical requirements is mainly characterized in that the controller inner housing 420b and the controller outer housing 410b of the controller 400b using the soft package lithium ion battery cell of the present embodiment form an outer positioning ring 423b for assembling and positioning with the battery outer housing 110b, and the inner electrode 330b is shorter and is bent only once.

The difference between the controller 400b of the present embodiment and the controller 400a of the first embodiment 1 described above will be described in detail below with reference to fig. 16 to 20.

As in embodiment 1 described above, the controller 400b of this embodiment also includes a controller outer case 410b, a controller inner case 420b, a circuit board 300b, a positive electrode cap 320b, an internal electrode 330b, an internal electrode insulating sheet 440b, and an electrode cap insulating sheet 450b.

As in embodiment 1 described above, the internal electrode 330b of this embodiment also includes an internal electrode fixing portion 331b and an internal electrode cell soldering station 334b. The structure of the inner electrode fixing portion 331b is the same as that of embodiment 1 described above, and will not be described here again. The inner electrode cell pad 334b is shorter than the embodiment 1 described above and is bent only once. That is, the inner electrode cell welding table is formed by integrally extending the inner electrode fixing portion 331b and bending the inner electrode fixing portion at one time.

Referring to fig. 20, the inner controller housing 420b of the present embodiment is not retracted inside the outer controller housing 410b, but extends outside the outer controller housing 410b, so as to form a ring of outer positioning ring 423b, when the controller 400b is fixed to the battery cell 200b, the outer positioning ring 423b may extend into the battery housing 110b and abut against the battery housing 110b, ensuring that the controller 400b is concentrically and coaxially mounted with the battery cell 200b and the battery housing, and in addition, during the welding process of the outer controller housing 410b and the battery housing 110b, the outer positioning ring 423b also prevents welding flame or slag from entering the battery housing 110b to damage the lithium ion battery cell.

In assembling the inner electrode 330b, the inner electrode 330b is first soldered to the circuit board 300b as shown in fig. 17 and the circuit board is soldered to the controller outer case 410b, and the controller inner case 420b is mounted, then the heat conductive adhesive 440b is poured and the inner electrode insulating sheet 440b is placed as shown in fig. 18, and then as shown in fig. 19, the inner electrode 330b is bent from the submerged portion of the thermally conductive paste 430b, and then the electrode cap insulating sheet 450b is placed on the surfaces of the limit plate 412b and the positive electrode cap bill 322b of the controller outer case 410b through the cap body of the positive electrode cap 320b as shown in fig. 20, and is adhesively connected to the limit plate 412b and the positive electrode cap bill 322 b.

Compared with embodiment 1, the inner electrode 330b is shorter and is bent only once, so that the structural material of the rechargeable battery is reduced, the manufacturing method is simplified, and the process cost is reduced.

Example 3, n-type No. 7 steel can lithium ion secondary battery.

Fig. 21 to 27 are structural diagrams of an N-type No. 7 steel-case lithium ion secondary battery and a controller thereof.

The secondary battery structure of this embodiment is similar to that of embodiment 1, except that embodiment 1 is a No. 5 battery, and this embodiment is a No. 7 battery, and since the diameter of the No. 7 battery is smaller than that of the No. 5 battery, there is a slight difference in the design of the controller, and it is mainly represented that the movable end of the inner electrode 330c of the controller 400c of the secondary battery pack of this embodiment 7 is circular, and the shape of the electrode cap pad 310c is different.

Referring to fig. 21, the battery 100c includes a battery cell 200c and a controller 400c.

The battery cell 200c of this embodiment is a steel-case lithium ion battery cell, which is also cylindrical, and has a battery cell positive electrode 230c and a battery cell negative electrode 220c, as in the above-described embodiment 1. The controller 400c is disposed at the end of the cell positive electrode 230 c.

Referring to fig. 22, as in the above-described embodiment 1, the controller 400c of the present embodiment also includes a controller outer case 410c, a controller inner case 420c, a circuit board 300c, a positive electrode cap 320c, an internal electrode 330c, an internal electrode insulating sheet 440c, and an electrode cap insulating sheet 450c.

Referring to fig. 23 and 24, since the diameter of the battery No. 7 of the present embodiment is smaller, the diameter of the controller 400c is smaller, and accordingly the diameter of the circuit board 300c is smaller, and the diameters of the vias on the circuit board 300c for conducting the first surface and the second surface of the circuit board are smaller, in order to avoid the holes being blocked by solder paste during the solder paste applying process before reflow soldering, it is preferable to design the pads so as to avoid the holes as much as possible.

The electrode cap pad 310c of the embodiment is also divided into a plurality of pad sections 311c by each channel 316c, each pad section 311c has an asymmetric structure, each pad section 311c has a corresponding structure of avoiding at each via hole, and each pad section 311c has a structure of avoiding at a position close to the glue injection hole 301 and the exhaust overflow hole 302c, so that each pad section 311c has an irregular structure as a whole.

However, since the electrode cap bonding pad 310c of this embodiment is also partitioned into a partition structure by the plurality of channels 316c, when the positive electrode cap is placed on the electrode cap bonding pad in a patch manner and passes through the reflow soldering machine, the gas volatilized by the soldering flux in the solder paste can diffuse out through the channels 316c, the partition structure of the bonding pad can disperse the stress on the surface of the solder paste, and the stress on the surface of the melted solder paste on each bonding pad partition 311c is controlled within a certain range by releasing the stress through the channels 316c, so that the situation that the positive electrode cap drifts when the circuit board 300c and the positive electrode cap 320c pass through the reflow soldering machine can be effectively inhibited, and the positive electrode cap attached in a PCB patch manner is ensured to be flat and not skewed.

Referring to fig. 25 to 27, which are assembly sequence diagrams of an inner electrode 330c of the present embodiment, the inner electrode 330c of the present embodiment is similar to the inner electrode 330a of the embodiment 1, and has two bending structures, wherein the movable end of the inner electrode die pad 334c of the present embodiment is circular, and the shape of the inner electrode circuit board pad 3312c of the inner electrode fixing portion 331c is different.

The inner electrode 330c of the present embodiment also includes an inner electrode fixing portion 331c and an inner electrode cell soldering station 334c. The inner electrode cell welding station 334c has a two-fold structure to facilitate connection with the boss-shaped steel-shell cell positive electrode 230 c. The movable end of the inner electrode cell welding table 334c is circular, so that the area of the movable end of the inner electrode cell welding table 334c is increased, welding with the positive electrode boss of the cell 200c is facilitated, and the contact area between the movable end of the inner electrode cell welding table 334c and the positive electrode boss of the cell 200c is increased.

The inner electrode fixing portion 331c includes two inner electrode positioning pins 3311c and an inner electrode circuit board soldering stage 3312c parallel to the circuit board 300c between the two inner electrode positioning pins 3311 c. The inner electrode circuit board welding table 3312c is bent in an L shape, the end of the inner electrode circuit board welding table 3312c is in a crotch shape, an opening groove 3313c is formed at the edge of the inner electrode circuit board welding table 3312c, two conductive flanges are formed at both sides of the opening groove 3313c, and the lengths of the two conductive flanges are different. The inner electrode positioning leg 3311c is the same as that of the above-described embodiments 1 and 2, and will not be described again here.

The circuit board 300C is provided with an inner electrode pad 312C to which the inner electrode 330C is soldered, and an inner electrode positioning hole 303C is provided in the inner electrode pad 312C. The inner electrode positioning pin 3311C of the inner electrode 330C is inserted into the inner electrode positioning hole 303C and fixed with solder to establish electrical connection with the inner electrode pad 312C, and the inner electrode circuit board bonding stage 3312C is flatly attached to the inner electrode pad 312C and fixed with solder to establish electrical connection with the inner electrode pad 312C. During welding, since the inner electrode circuit board welding table 3312c is in a crotch shape, the solder extends along the opening 3313c and the peripheries of the two conductive flanges, so that the connection strength between the inner electrode 330c and the circuit board 300c is enhanced, and meanwhile, the contact area between the inner electrode 330c and the circuit board 300c is increased by the inner electrode circuit board welding table 3312c, so that the heat dissipation efficiency of the control circuit is improved due to the fact that large current is passed.

In addition, the second surface of the circuit board 300C in this embodiment is used for welding a plurality of inner shell bonding pads 314C of the inner shell 420C of the controller, and is in an irregular structure, and is respectively arranged at the peripheral edge of the circuit board 300C at intervals, so that more space can be made for arranging circuit components on the second surface of the circuit board, single-sided circuit components on the circuit board with smaller diameter can be realized, and the axial overall height of the controller is reduced.

Example 4, n type No. 7 soft pack lithium ion secondary battery.

Fig. 28 to 31 are structural diagrams of an N-type No. 7 soft pack lithium ion secondary battery and a controller thereof.

Referring to fig. 28, the battery 100d includes a battery cell 200d and a controller 400d.

The battery cell 200d of this embodiment is a soft-pack lithium ion battery cell, which is also cylindrical, and has a battery cell positive electrode 230d and a battery cell negative electrode, as in the above-described embodiment 2. The controller 400d is disposed at the end of the cell positive electrode 230 d.

The secondary battery structure of this embodiment is similar to that of embodiment 2 in that embodiment 2 is a No. 5 battery, and this embodiment is a No. 7 battery, and since the diameter of the No. 7 battery is smaller than that of the No. 5 battery, there is a slight difference in the design of the controller, which is mainly represented by the fact that the movable end of the inner electrode 330d of the controller 400d, which is configured with the soft pack lithium ion secondary battery of this embodiment 7, is circular.

The inner electrode 330d of the present embodiment also includes an inner electrode fixing portion 331d and an inner electrode cell land 334d. The structure of the inner electrode fixing portion 331b is the same as that of embodiment 1 described above, and will not be described here again. The inner electrode cell welding stage 334b is shorter than the above-described embodiment 1 and is bent only once, so that it is convenient to lap-weld with the long-shaped cell positive electrode 230d of the soft-pack lithium ion cell. And the movable end of the inner electrode 330d is circular, so that the contact area with the cell positive electrode 230d is increased, and the welding and the passing of large current between the two are facilitated.

The structure of the inner electrode fixing portion 331d of the inner electrode 330d of this embodiment is the same as that of the inner electrode fixing portion 331c of the above embodiment 3, that is, the inner electrode fixing portion also includes two inner electrode positioning pins and an inner electrode circuit board welding table located between the two inner electrode positioning pins, the inner electrode circuit board welding table is also in a crotch shape, and the specific structure and technical effects of the inner electrode circuit board welding table have been described in detail in the above embodiment 3 and are not repeated here.

Example 5 p-type No. 5 aluminum case lithium ion secondary battery.

Fig. 32 to 35 are structural diagrams of a P-type No. 5 aluminum case lithium ion secondary battery and a controller thereof.

The battery 100e also includes a battery cell 200e and a controller 400 e.

The battery cell 200e in this embodiment is an aluminum-shell lithium ion battery cell, that is, the battery cell is packaged by a metal aluminum shell, and has a similar shape to that of a steel-shell lithium ion battery cell, and is also cylindrical, and has a battery cell positive electrode 230e and a battery cell negative electrode. The aluminum shell of the battery cell 200e is a battery cell positive electrode, one end of the battery cell 200e is provided with a negative electrode boss, and the negative electrode of the battery cell 200e is connected with the negative electrode boss.

The biggest difference between this embodiment and the above embodiments 1-4 is that the controller 400e of this embodiment is disposed at the end of the negative electrode of the battery cell, correspondingly, the positive electrode cap on the first surface of the circuit board in the controller 400e is replaced by the negative electrode cap 320e with larger diameter, after the battery is assembled, the negative electrode cap 320e is exposed at one end of the battery 100e, the welding table of the inner electrode cell of the inner electrode contacts and is electrically connected with the negative electrode boss of the battery cell, the controller housing is connected with the aluminum shell of the battery cell, and the other end of the battery 100e opposite to the negative electrode cap 320e is the positive electrode cap 230e of the boss type of the battery cell.

Specifically, referring to fig. 33 to 35, the controller 400e of the present embodiment includes a controller outer case 410e, a controller inner case 420e, a circuit board 300e, a negative electrode cap 320e, an internal electrode 330e, an internal electrode insulating sheet 440e, and an electrode cap insulating sheet 450e.

The controller outer case 410e, the controller inner case 420e, the internal electrode 330e, the internal electrode insulating sheet 440e, and the electrode cap insulating sheet 450e are the same as those of the above-described embodiment 1, and a detailed description thereof will be omitted.

The negative electrode cap 320e of this embodiment is also a hollow electrode cap having an inner cavity, and includes a cylindrical cap body 321e having an opening at one end and a ring-shaped cap peak 322e provided in the circumferential direction of the opening end of the cylindrical cap body. The cap body 321e comprises a cylindrical cap wall and a cap top closed at one end of the cap wall, the cap peak 322e is perpendicular to the cap wall of the cap body 321e, and the negative electrode cap 320e is reversely buckled on the circuit board 300e towards the direction of the circuit board 300e by the opening end of the negative electrode cap 320e and is welded with the circuit board 300e through the cap peak 322e. The diameter of the cap body of the negative electrode cap 320e is larger and the radial dimension of the bill 322e is smaller than the positive electrode cap 320 a.

The circuit board 300e is also provided with a plurality of channels 316e for soldering the electrode cap pad 310e of the negative electrode cap 320e, and each channel 316e divides the electrode cap pad 310e into a plurality of pad sections 311e.

Alternatively, the pad areas 311e are three or more, and the number of the pad areas is 8 in this embodiment. Each pad section 311e encloses an annular region, and when the negative electrode cap 320e is soldered to the circuit board 300e, the cap peak 322e of the negative electrode cap 320e covers each channel 316e and each pad section 311e. Therefore, when the negative electrode cap 320e is placed on the electrode cap bonding pad 310e in a surface mounting mode and passes through the reflow soldering machine, the gas volatilized by the soldering flux in the solder paste can be diffused out through the channel 316e, the stress on the surface of the solder paste is dispersed, and the stress is released through the channel 316e, so that the stress on the surface of the molten solder paste on each bonding pad partition 311e is controlled within a certain range, the situation that the positive electrode cap drifts when the circuit board 300e and the positive electrode cap 320e pass through the reflow soldering machine can be effectively restrained, and the situation that the positive electrode cap attached in a surface mounting mode of the PCB board is flat and not askew is ensured.

The center of the annular region surrounded by each pad section 311e is concentric with the cap peak 322e of the negative electrode cap 320e, so that each pad section 311e has a centering effect with the cap peak of the negative electrode cap 320e when passing through the reflow soldering machine, and the negative electrode cap 320e is ensured not to drift.

In this embodiment, when the controller 400e is integrally packaged with the battery cell 200e, the internal electrode 330e of the controller 400e contacts with the negative electrode of the battery cell and establishes an electrical connection, and the control circuit is correspondingly changed compared with the above-mentioned embodiments 1-4. In other embodiments, the controller 400e may be packaged at the negative electrode end of the cell, but insulation is provided between the internal electrode 330e of the controller 400e and the negative electrode of the cell, and the internal electrode 330e of the controller 400e is connected to the positive electrode 230e of the cell through a wire or a conductive sheet, where the control circuit of the controller 400e may employ the controller circuits of embodiments 1-4.

Example 6, p-type No. 5 soft pack lithium ion secondary battery.

Fig. 36 to 37 are structural diagrams of a controller of the P-type No. 5 soft pack lithium ion secondary battery.

As with the P-type No. 5 aluminum-shell lithium-ion secondary battery of example 5 described above, the controller of the secondary battery of this example is also packaged at the negative electrode terminal of the cell.

Unlike embodiment 5, the battery cell of this embodiment is a positive electrode sheet disposed at one end of the soft package battery cell, the positive electrode sheet extends from one end to the other end of the battery cell, the battery cell is sleeved in a battery housing, the positive electrode sheet is welded with the battery housing, the controller housing is connected with the battery housing, the negative electrode sheet disposed at the other end of the battery cell is a negative electrode sheet, and the negative electrode sheet is connected with the internal electrode cell welding table of the controller 400 f.

The controller 400f of the present embodiment also includes a controller outer case 410f, a controller inner case 420f, a circuit board 300f, a negative electrode cap 320f, an internal electrode 330f, an internal electrode insulating sheet 440f, and an electrode cap insulating sheet 450f.

Unlike embodiment 5, the inner electrode 330f of the controller of the present embodiment is a short structure suitable for the soft-packaged battery cell, and the inner electrode battery cell welding table 334f is formed by one bending, so as to be in overlap joint with the long tab-type battery cell negative electrode of the soft-packaged battery cell in a matching manner to establish an electrical connection.

Example 7, n-type No. 5 steel-shelled lithium ion secondary battery (positive electrode cap solid).

Fig. 38 to 41 are structural diagrams of a controller of an N-type No. 5 steel-shell lithium ion secondary battery of this embodiment.

The secondary battery 100g of the present embodiment is similar to the secondary battery 100a of the above-described embodiment 1 in that the controller 400g of the present embodiment is also packaged at the positive electrode terminal of the battery cell 200g, and a battery cell insulating sheet 233g is provided between the controller 400g and the battery cell 200 g.

The secondary battery 100g of this embodiment is different from the secondary battery 100a of embodiment 1 in that the positive electrode cap 323g of the controller 400g of this embodiment is a solid structure, and accordingly, the shape of the bonding pad for bonding the solid positive electrode cap 323g of the circuit board 300g is slightly different, and other structures, such as the controller inner case 420g, the controller outer case 410g, the internal electrode 330g, the internal electrode insulating sheet 440g, and the electrode cap insulating sheet 450g, are the same as those of embodiment 1, so the description of this embodiment is omitted for the same structure.

The positive electrode cap 323g is a solid wafer or a solid cylinder, and the first surface of the circuit board 300g is provided with electrode cap pads 310g for soldering the electrode cap 323g, and the electrode cap pads 310g are located in the region of the circuit board covered by the solid electrode cap 323 g. The first surface of the circuit board 300g is provided with a plurality of channels 316g, each channel 316g dividing the electrode cap pad 310g into a plurality of pad partitions 311g. The function of the channel 316g is the same as that of the above-described embodiment 1 for preventing the positive electrode cap 323g from drifting during reflow soldering.

In this embodiment, each channel 316g is a straight channel, and is distributed in a converging state from the outer periphery to the center of the circuit board 300 g. Each of the channels 316g intersects the center of the circular circuit board 300g, and the extending direction of the channel 316g coincides with the radial direction of the circuit board 300 g. Thereby causing the passage 316g to form an automatic centering effect on the positive electrode cap 323g, which automatically centers the electrode cap 323g on the center of the circuit board 300 g.

The channels 316g of the present embodiment are converged in the center, so that the pad sections 311g are in a fan-shaped structure, and in other embodiments, the channels 316g may be designed to have a center-converged structure, for example, the channels 316g in embodiment 1 are only converged and distributed but not converged in a center, and at this time, the pad sections 311g are distributed into an annular region, and the structure can also have a centering effect on the positive electrode cap 323g during reflow soldering, so as to ensure concentric and coaxial soldering of the positive electrode cap and the circuit board 300 g.

Optionally, each pad section 311g has a central symmetrical structure with respect to the center of the circuit board, so that the distribution of the soldering stress on the circuit board 300g is more uniform, and the soldering flatness of the circuit board is ensured.

Since the solid bottom surface of the solid positive electrode cap 323g in this embodiment can be used as a soldering surface for soldering the circuit board 300g, the solid positive electrode cap 323g omits the cap peak structure, and has smaller radial dimension, so that the positive electrode cap 323g occupies the area of the first surface of the circuit board 300g, thereby freeing up space on the first surface for laying other functional circuit components. In addition, the solid positive electrode cap 323g is simple in manufacturing process, can be formed by only one stamping process, and saves manufacturing cost.

Example 8, p-type No. 7 aluminum case lithium ion secondary battery (negative electrode cap solid).

Referring to fig. 42 to 44, the secondary battery of the present embodiment is similar to the secondary battery of the above-described embodiment 7 in that embodiment 7 is a No. 5 battery, embodiment 7 is a No. 7 battery, and the size is smaller, and further, the controller 400h of the present embodiment is mounted at the end of the negative electrode of the battery cell 200h, the electrode cap on the controller 400h is replaced with a solid negative electrode cap 323h, the negative electrode cap 323h is exposed to the outside of the battery when the controller 400n is welded with the battery cell 200h as a whole, and the positive electrode cap 320h is opposite to the positive electrode cap 320h of the positive electrode of the battery cell 200h, and the negative electrode cap 323h is used as the charge input and discharge output of the battery 100 h.

The shell of the battery cell 200h is an aluminum shell, the aluminum shell of the battery cell 200h is a positive electrode of the battery cell, the controller shell is connected with the aluminum shell, one end of the battery cell 200h is provided with a negative electrode boss, the negative electrode of the battery cell 200h is connected with the negative electrode boss, and the negative electrode boss is connected with an inner electrode battery cell welding table of the battery controller 400 h.

The negative electrode cap 323h of the present embodiment is a solid structure, and the radial dimension and the axial height of the negative electrode cap 323h can be designed to be solid disc or solid cylinder according to the requirement. Unlike the above embodiment 7, the electrode cap pad 310h of the present embodiment is of an asymmetric structure, and each via hole of each pad partition 311h on the corresponding circuit is provided with an avoidance structure, and the channel 316h of the present embodiment is the same as the above embodiment 7, and its technical effects are also the same as the above embodiment 7, and are not repeated here.

In other embodiments, there may be only one channel on the circuit board, in which case the electrode cap pad may be a split ring, and when the electrode cap patch is soldered to the circuit board, the electrode cap at least partially covers the channel and the electrode cap pad, i.e. there is a physical structure covering the electrode cap at the location corresponding to the channel and the electrode cap pad.

When the number of the channels is one and the channels are straight channels, the electrode cap pads can also be two opposite semi-circles which are symmetrically distributed, or two opposite semi-circles which are symmetrically distributed.

When the number of the channels is one, the channels can also be S-shaped, and the electrode cap bonding pads are divided into two bonding pad subareas which are distributed in a central symmetry mode and are similar to a Taiji graph.

When the number of channels is plural, each channel may be concentrated in a center in a vortex shape, or each channel may be distributed in a vortex-like concentrated state but not concentrated in a center.

The electrode cap is solid or hollow, and can be applied to all the electrode cap bonding pad shapes, so that the effects of dispersing the surface stress of solder paste and diffusing the volatilized gas of the soldering flux during the welding of the electrode cap patch can be achieved, and the reflow welding of the electrode cap is ensured not to be askew and drift.

The structural features of the above embodiments may be applied to batteries of different models and types by intersecting each other as needed, and are not limited to the fixed combination structure in the above examples.

While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A battery controller, characterized in that the controller comprises:

The circuit board comprises: a first surface and a second surface opposite to each other, wherein the second surface is welded with circuit components;

The electrode cap is made of conductive metal and is welded to the first surface of the circuit board by patch method. The first surface of the circuit board is provided with an electrode cap pad for welding the electrode cap, and the electrode cap pad has a channel.

2. The battery controller as claimed in claim 1, characterized in that the number of the channel is one, the electrode cap pad is in the form of a notched ring interrupted by the channel, and the electrode cap at least partially covers the channel and the electrode cap pad.

3. The battery controller as described in claim 1 is characterized in that the channel divides the electrode cap pad into at least two pad partitions, and each pad partition is symmetrically distributed relative to a center.

4. The battery controller as described in claim 3 is characterized in that the channel is S-shaped, and the electrode cap pad is divided by the channel into two pad partitions that are centrally symmetrically distributed.

5. The battery controller as described in claim 1 is characterized in that each of the channels is distributed in a convergent state from the periphery of the circuit board to the center.

6. The battery controller as described in claim 3 is characterized in that each pad partition encloses an annular area concentric with the outer contour of the electrode cap, the pad partition is fan-shaped, and each pad partition is symmetrically distributed with the vertical center plane of the circuit board as the symmetry plane.

7. The battery controller as described in claim 1 is characterized in that the electrode cap is a hollow electrode cap with an inner cavity, and the electrode cap comprises: a cylindrical cap body with an open end and a brim arranged circumferentially at the open end of the cap body, and the open end of the electrode cap faces the circuit board.

8. The battery controller as described in claim 7 is characterized in that the area where the cap body covers the circuit board is the cap body covering area, the area where the brim covers the circuit board is the brim covering area, the outer contour of each of the pad partitions is located within the outer contour of the brim covering area, and the inner contour of at least one of the pad partitions exceeds the brim covering area and extends inward into the cap body covering area.

9. The battery controller as described in claim 8 is characterized in that a glue injection hole and an exhaust overflow hole are opened on the circuit board, the glue injection hole and the exhaust overflow hole are distributed in the cap body covering area, and the inner cavity of the electrode cap is filled with thermal conductive glue through the glue injection hole.

10. The battery controller as described in claim 1 is characterized in that the electrode cap is a solid disc or a solid cylinder, the electrode cap pad is located in the area of the circuit board covered by the solid electrode cap, and each of the channels intersects at the center of the circular circuit board.

11. The battery controller as described in claim 9 is characterized in that the channel is a straight channel, the central angles formed between adjacent channels are equal, the pad partitions are evenly and equally distributed on the circuit board, the electrode caps are positive electrode caps or negative electrode caps, the channels converge at the center of the circular circuit board, and the extension direction of the channel is consistent with the radius direction of the circuit board, and the pad partitions are fan-shaped.

12. The battery controller as described in claim 1 is characterized in that the battery controller has only one circuit board, and the circuit components are only distributed on the second surface of the circuit board, or are distributed on the second surface of the circuit board and the part of the first surface of the circuit board covered by the electrode cap.

13. The battery controller as described in claim 1 is characterized in that the battery controller also includes a controller housing having an inner cavity, and the circuit board is accommodated in the inner cavity of the controller housing.

14. The battery controller as described in claim 13 is characterized in that the controller shell includes a controller outer shell made of metal material, one end of the controller outer shell has a limit baffle, and the other end is a bottomless tubular opening end, a through hole is opened in the center of the limit baffle, the electrode cap extends out through the through hole of the limit baffle, and a shell soldering pad is provided near the outer edge of the first surface of the circuit board, and the circuit board is welded or crimped to the inner surface of the limit baffle through the shell soldering pad and is electrically connected to the inner surface of the limit baffle.

15. The battery controller as described in claim 14 is characterized in that the controller outer shell includes: an outer cylindrical wall, the controller shell also includes a controller inner shell made of metal material coaxial with the outer wall of the controller outer shell and installed on the second surface of the circuit board, the controller inner shell is accommodated in the controller outer shell, and the controller inner shell includes: an annular inner wall, an inner shell pad is provided near the outer edge of the second surface of the circuit board, the outer shell pad on the first surface of the circuit board is electrically connected to the inner shell pad on the second surface of the circuit board through the circuit board via, and one end of the controller inner shell is welded to the inner shell pad.

16. The battery controller as described in claim 15 is characterized in that the inner shell of the controller also includes a support portion formed at one end of the inner wall and bent toward the central axis direction of the inner wall, a circular chamfer is formed between the support portion and the inner wall of the inner shell, the circular chamfer constitutes a transition portion, and a gap for accumulated solder is formed between the transition portion and the outer wall and the inner shell pad of the circuit board.

17. The battery controller as described in claim 16 is characterized in that the supporting part includes a plurality of limit bend feet formed at one end of the inner wall and distributed circumferentially along the inner wall, the limit bend feet are spaced apart from each other, grooves are formed between adjacent limit bend feet, one end of each limit bend foot away from the inner wall is bent toward the central axis of the inner wall, and the top of each limit bend foot forms a connecting surface that is flat against the inner shell welding pad.

18. A battery controller as described in claim 16, characterized in that the support portion includes a fixing ring formed at one end of the inner wall and bent and extended toward the center direction of the inner wall, the fixing ring is fixed to the circuit board through the inner shell welding pad, and a gap is formed between the fixing ring and the controller outer shell.

19. A battery controller as described in claim 13, characterized in that the controller also includes an internal electrode for connecting a battery cell, the internal electrode is made of a conductive metal material, the internal electrode includes an internal electrode fixing portion that is fixed and electrically connected to the circuit board, the internal electrode also includes an internal electrode battery cell welding station that is bent relative to the internal electrode fixing portion and is used to electrically connect the battery cell, openings are respectively provided at two opposite ends of the controller housing, the electrode cap is exposed to the controller housing through one of the through holes, and the internal electrode battery cell welding station is exposed to the controller housing through the other opening.

20. The battery controller as described in claim 19 is characterized in that only one end of the inner electrode is fixed to the circuit board to form an inner electrode fixing portion, and the other end of the inner electrode is a movable end that constitutes the inner electrode battery core welding station and is not connected to the circuit board.

21. The battery controller as described in claim 20 is characterized in that the internal electrode cell welding platform is integrally formed with the internal electrode fixing part, the internal electrode fixing part includes an internal electrode positioning foot that can be inserted into and welded on the circuit board and an internal electrode circuit board welding platform that is flat against the surface of the circuit board, the circuit board is provided with an internal electrode positioning hole for the internal electrode positioning foot to be inserted and an internal electrode pad for the internal electrode circuit board welding platform to be flat against and welded thereto, the internal electrode pad surrounds the periphery of the internal electrode positioning hole, so that the internal electrode positioning foot of the internal electrode fixing part and the internal electrode circuit board welding platform share the same pad.

22. The battery controller as described in claim 21 is characterized in that there are two inner electrode positioning pins, the inner electrode circuit board welding platform is located between the two inner electrode positioning pins, and the inner electrode circuit board welding platform is provided with a slot-shaped through hole penetrating the thickness direction thereof.

23. The battery controller as described in claim 21 is characterized in that the inner electrode positioning hole passes through the first surface and the second surface of the circuit board, and the inner electrode positioning hole is exposed on the electrode cap and the controller housing, and the battery controller also includes an electrode cap insulating sheet sleeved on the electrode cap, a through hole is provided in the center of the electrode cap insulating sheet, the electrode cap is exposed outside the electrode cap insulating sheet through the through hole, and the electrode cap insulating sheet covers the inner electrode positioning hole.

24. The battery controller as described in claim 20 is characterized in that the inner electrode cell welding platform is formed by an integral extension of the inner electrode fixing portion, which is bent once and then bent twice in the opposite direction, wherein the first bending forms a first contact piece, and the second bending forms a second contact piece, and the second contact piece overlaps with the first contact piece.

25. The battery controller as claimed in claim 20, characterized in that the inner electrode cell welding station is formed by integrally extending the inner electrode fixing portion and then being bent once.

26. The battery controller as described in claim 19 is characterized in that the inner cavity of the controller shell is filled with thermal conductive adhesive, the internal electrode cell welding platform is exposed outside the thermal conductive adhesive, the thermal conductive adhesive submerges the circuit components on the second surface of the circuit board, and at least a portion of the internal electrode cell welding platform is exposed by the controller shell.

27. The battery controller as described in claim 26 is characterized in that the surface of the thermally conductive adhesive is covered with an internal electrode insulating sheet of insulating material, the internal electrode battery cell welding station is located outside the internal electrode insulating sheet, the internal electrode battery cell welding station is provided with a resistance welding choke groove that runs through the thickness direction of the internal electrode, and the internal electrode insulating sheet is provided with an avoidance groove corresponding to the internal electrode fixing portion.

28. A cylindrical secondary battery, comprising:

A battery cell, in a cylindrical shape, having a positive electrode and a negative electrode; and,

The battery controller is the battery controller described in any one of claims 1-27, which is coaxially stacked on the positive electrode end or the negative electrode end of the battery cell and packaged as a whole with the battery cell.

29. The cylindrical secondary battery as described in claim 28 is characterized in that the battery controller also includes a controller shell having an inner cavity, the circuit board is accommodated in the inner cavity of the controller shell, the electrode cap is exposed outside the controller shell, and the second surface of the circuit board is also electrically connected to an internal electrode, the internal electrode is a conductive material, and has an internal electrode cell welding station exposed from the controller shell, and the internal electrode cell welding station welds and electrically connects the positive electrode or negative electrode of the cell.

30. The cylindrical secondary battery according to claim 29, characterized in that the battery cell is a soft-pack battery cell, the negative electrode arranged at one end of the battery cell is a negative electrode sheet, the negative electrode sheet extends from one end to the other end of the battery cell, the battery cell is inserted into a battery outer shell, the negative electrode sheet is welded to the battery outer shell, and the controller housing is connected to the battery outer shell;

The positive electrode arranged at the other end of the battery cell is a positive electrode sheet, and the positive electrode sheet is connected to the inner electrode battery cell welding station of the battery controller.

31. The cylindrical secondary battery according to claim 29, characterized in that the outer shell of the battery cell is a steel shell, the steel shell of the battery cell is the negative electrode of the battery cell, and the controller housing is connected to the steel shell;

The battery cell has a positive electrode boss, the positive electrode of the battery cell is connected to the positive electrode boss, and the positive electrode boss is connected to the inner electrode battery cell welding station of the battery controller.

32. The cylindrical secondary battery according to claim 29, characterized in that the battery cell is a soft-pack battery cell, the positive electrode disposed at one end of the battery cell is a positive electrode sheet, the positive electrode sheet extends from one end to the other end of the battery cell, the battery cell is inserted into a battery outer shell, the positive electrode sheet is welded to the battery outer shell, and the controller shell is connected to the battery outer shell;

The negative electrode arranged at the other end of the battery cell is a negative electrode sheet, and the negative electrode sheet is connected to the inner electrode battery cell welding station of the battery controller.

33. The cylindrical secondary battery according to claim 29, characterized in that the outer shell of the battery cell is an aluminum shell, the aluminum shell of the battery cell is the positive electrode of the battery cell, and the controller housing is connected to the aluminum shell;

One end of the battery cell has a negative electrode boss, the negative electrode of the battery cell is connected to the negative electrode boss, and the negative electrode boss is connected to the inner electrode battery cell welding station of the battery controller.