CN211455885U - Columnar secondary battery and battery controller - Google Patents

Abstract

The utility model provides a column secondary battery and battery controller, the battery include electric core and with the coaxial encapsulated controller of electric core, the controller includes: circuit board and electrode cap, the circuit board includes: the circuit board comprises a first surface and a second surface which are opposite, wherein a circuit component is arranged on the second surface in a welding mode; the electrode cap is made of conductive metal and is welded on the first surface of the circuit board in a patch 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. This application is through adopting the paster mode to weld the dress electrode cap and come the optimization controller structure for the axial height of controller reduces, and then improves rechargeable battery's absolute electric power storage energy and volumetric specific energy.

Description

Cylindrical secondary battery and battery controller

technical field

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

Background technique

GB/T 8897.2 (IEC 60086-2) standardized cylindrical primary batteries, such as China's popular AA batteries, AA batteries, etc., have been widely used in handheld or portable electronic and electrical products. Due to the fact that primary batteries cannot be reused, and there are problems such as high battery usage costs and environmental pollution from discarded batteries, the consumer market has an increasing demand for rechargeable battery products that can replace GB/T 8897.2 (IEC 60086-2) standardized primary batteries. .

With the rapid development of lithium-ion battery charge-discharge control technology, the charge-discharge control circuit is used to control the charge-discharge of the lithium-ion battery, and then the DC-DC converter circuit converts the lithium-ion battery voltage into the required voltage for regulated discharge. method to form a secondary rechargeable battery compatible with GB/T 8897.2 (IEC 60086-2). Such lithium-ion secondary rechargeable batteries can have numerous advantages in terms of nominal voltage compatibility, discharge voltage stability, charge rate, specific energy by weight and volume, charge-discharge memory effect and tolerance, and cycle life.

This type of electronically controlled rechargeable battery that integrates the charge and/or discharge control circuit, the DC-DC conversion circuit and the lithium-ion battery package, or the charging circuit is packaged in the battery charging box, and the discharge control circuit, DC - The electronically controlled rechargeable battery, which is composed of the DC conversion circuit and the lithium-ion battery package, has been widely recognized by the battery consumer market and is gradually replacing traditional electrochemical rechargeable batteries such as nickel-metal hydride batteries.

In the consumer rechargeable battery market, improving the absolute storage energy and volume specific energy of rechargeable batteries and reducing the cost of rechargeable battery products has always been the main direction of market demand and the development direction of rechargeable battery product technology. The development direction of control type rechargeable battery product technology.

The current packaging method of lithium-ion rechargeable batteries basically adopts the method of integrating the discharge control circuit or the charge-discharge control circuit and the DC-DC conversion circuit into a controller, and then the controller and the lithium-ion battery are packaged into one, forming a Lithium-ion rechargeable battery. The controller is stacked on the positive terminal or the negative terminal of the battery cell, and the total height of the controller and the battery cell constitutes the total height of the battery. Since the total height and diameter of the cylindrical battery are defined by GB/T 8897.2 (IEC 60086-2), the height of the controller can only be compressed in order to increase the volume of the battery cell, thereby increasing the absolute stored energy of the battery cell.

A method of thinning the controller is to omit some functional circuits in the controller, so as to achieve the purpose of simplifying the structure of the controller and reducing the height of the controller. But this approach will reduce battery function and potential safety risks, causing the battery to overheat and even explode. However, integrating various functional circuits in the controller will cause defects such as complicated structure of the control circuit and large size of the controller. On the premise of ensuring the complete functions of the control circuit, how to reduce the manufacturing cost of the controller as much as possible, reduce the axial height of the controller, and improve the absolute power storage capacity of the battery cell is a difficult problem to be overcome in the industry.

According to the position of the controller packaged in the battery, the battery can be divided into two types, one type of 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 end usually includes a circuit board and a positive electrode end cap. The controller packaged at the negative end usually includes a circuit board and a negative electrode cap. Both the positive electrode end cap or the negative electrode cap need to be fixed on the circuit board by soldering. And establish an electrical connection with the circuit board.

The brim of the positive electrode cap or the negative electrode cap is usually provided with pins, the circuit board is provided with pin holes for the pins to be inserted into, and the back of the circuit board is provided with pin pads around the corresponding pin holes, and the pins are inserted into the circuit. After the board is installed, the pins are welded to the pin pads on the back of the circuit board through a spot welding process. On the one hand, the welding efficiency of this structure is low, and it is necessary to insert electrode caps one by one and spot-weld each pin one by one, resulting in high production cost; The position of the pin hole and the pin pad, and in order to avoid the short circuit between the pin and other components, the pin pad must be kept away from other components by a certain distance, resulting in a serious lack of layout space for other components, and it has to be omitted. The functional components or the components are arranged on the front of the circuit board to increase the total axial height of the controller, thereby affecting the battery capacity.

How to improve the welding efficiency, reduce the cost of the battery, and improve the absolute storage energy and volume specific energy of the battery is an urgent problem to be overcome.

Utility model content

The purpose of the present disclosure is to provide a battery controller with low cost and small thickness, which can improve the absolute power storage energy and volume specific energy of the secondary battery.

According to an aspect disclosed in the present application, a battery controller is provided, including:

A circuit board, comprising: an opposite first surface and a second surface, the second surface is soldered with circuit components;

The electrode cap is made of conductive metal material, which is welded on the first surface of the circuit board by means of patch, and the first surface of the circuit board is provided with an electrode cap pad for welding the electrode cap. There are vias at the cap pads.

Optionally, the number of the channels is one, the electrode cap pads are in the form of notched rings broken by the channels, and the electrode caps at least partially cover the channels and the electrode cap pads.

Optionally, the channel divides the electrode cap pad into at least two pad sub-regions, and each pad sub-region 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 that are symmetrically distributed in the center by the channel.

Optionally, each of the channels is distributed in a convergent state from the outer circumference of the circuit board toward the center, and the electrode cap covers the channel and the pad partition.

Optionally, the number of the pad partitions is two or more, each pad partition is surrounded by an annular area concentric with the outer contour of the electrode cap, the pad partition is fan-shaped, and each pad partition is formed by a circuit board. The vertical mid-section plane is symmetrically distributed.

Optionally, the electrode cap is a hollow electrode cap with an inner cavity, and the electrode cap includes: a cylindrical cap body with one end open and a cap brim arranged in the circumferential direction of the open end of the cap body, the open end of the electrode cap is towards the circuit board.

Optionally, the area where the cap body covers the circuit board is the cap body coverage area, the area where the brim covers the circuit board is the brim coverage area, and the outer contour of each pad partition is located in the brim coverage area. Within the outer contour of the area, the inner contour of at least one of the pad sub-areas extends beyond the brim coverage area and protrudes inwardly into the cap body coverage area.

Optionally, a glue injection hole and an exhaust overflow hole are opened on the circuit board, and the glue injection hole and the exhaust overflow hole are distributed in the covering area of the cap body, and the inner cavity of the electrode cap is provided. The thermal conductive glue is filled through the glue injection hole.

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

Optionally, the channel is a straight channel, the central angle formed between each adjacent channel is equal, each of the pad partitions is evenly and equally distributed on the circuit board, and the electrode cap is a positive electrode cap. Or a negative electrode cap, each of the channels meets at the center of the circular circuit board, and the extension direction of the channels is consistent with the radial direction of the circuit board, and the pad partitions are fan-shaped.

Optionally, 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 first surface of the circuit board at the same time. The part covered by the electrode cap.

According to another aspect disclosed in the present application, a cylindrical secondary battery is provided, including:

a cell, in the form of a cylinder, having a positive electrode and a negative electrode; and,

The battery controller is coaxially stacked on the positive electrode end or the negative electrode end of the battery core and packaged together with the battery core.

Optionally, the battery controller further includes a controller casing with an inner cavity, the circuit board is accommodated in the inner cavity of the controller casing, and the electrode cap is exposed on the inside of the controller casing. In addition, the second surface of the circuit board is also electrically connected with an inner electrode, which is made of conductive material and has an inner electrode cell welding station exposed on the controller housing. The welding station welds and electrically connects the positive electrode or the negative electrode of the cell.

Optionally, the cell is a soft-wrapped cell, the negative electrode provided at one end of the cell is a negative electrode sheet, the negative electrode sheet extends from one end to the other end of the cell, and the cell sleeve into a battery shell, the negative electrode sheet is welded and connected with the battery shell, and the controller shell is connected with the battery shell;

The positive electrode provided at the other end of the cell is a positive electrode sheet, and the positive electrode sheet is connected to the welding station of the inner electrode cell 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 to the steel shell;

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

Optionally, the cell is a soft-wrapped cell, the positive electrode provided at one end of the cell is a positive electrode sheet, the positive electrode sheet extends from one end to the other end of the cell, and the cell is The core is sleeved into a battery casing, the positive electrode sheet is welded and connected to the battery casing, and the controller casing is connected to the battery casing;

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

Optionally, the outer shell of the battery core is an aluminum shell, the aluminum shell of the battery core is a positive electrode of the battery core, and the controller shell is connected to the aluminum shell;

One end of the battery cell has a negative electrode boss, the negative electrode of the battery core 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.

The technical effects of the cylindrical secondary battery and the battery controller of the present application are as follows:

By using the PCB board patch and hot air reflow process to weld and fix the positive electrode cap, and use the single-end connection of the inner electrode to the circuit board, the space of the circuit board can be saved, so that the circuit components can be distributed on one side of the circuit board. , thereby reducing the overall height of the charge and discharge controller, making more space for the battery cell and increasing the battery cell capacity, thereby increasing the volume specific energy of the rechargeable battery.

The cooperation between the outer casing of the controller and the inner casing of the controller improves the structural strength of the charge and discharge controller, and also improves the overall electromagnetic shielding effect of the controller.

By using the PCB board patch and hot air reflow process to install and fix the positive electrode cap, design the electronic components on one side of the circuit board, use a single end to connect the inner electrode to the circuit board and fold it in the later stage The structure and process design simplifies the charging process. The structure and manufacturing process of the discharge controller reduce the material cost and manufacturing cost of the charge and discharge controller.

The packaging method of pouring thermal conductive glue in the controller improves the heat dissipation rate of the circuit board control circuit, reduces the temperature difference between the inside and the outside of the controller, improves the control accuracy of charge and discharge temperature, improves the structural strength of the controller, and realizes the structure of the controller. It is sealed, which improves the adaptability and reliability of the charging and discharging working environment of the secondary battery.

Using the PCB board patch and hot air reflow process to install and fix the positive electrode cap, and design the circuit components on one side of the circuit board, it is easier to realize the thick film of the circuit board, thereby simplifying the manufacturing process and reducing costs.

Description of drawings

1 is an outline view of a cylindrical secondary battery shown in Example 1;

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

3 is an exploded view of the battery controller of Embodiment 1;

4 is an assembly state diagram of a positive electrode end cap and a circuit board in the battery controller of Example 1;

4a is a first surface view of the circuit board in the battery controller of Embodiment 1;

5 is an assembly state diagram of an inner electrode and a circuit board in the battery controller of Example 1;

6 is an assembly state diagram of the circuit board and the outer casing of the controller in the battery controller of Embodiment 1;

Fig. 7 is the assembled state diagram of the inner casing of the battery controller and the outer casing of the controller according to 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 gluing;

Fig. 10 is the assembled state diagram of the inner electrode insulating sheet of the battery controller of Example 1;

11 is a structural diagram of an internal electrode working state of the battery controller of Embodiment 1;

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

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

14 is an assembly state diagram of the controller and the cell of the cylindrical secondary battery shown in Example 2;

15 is an exploded view of the battery of Example 2;

16 is an exploded view of the battery controller of Embodiment 2;

17 is an assembly state diagram of an internal electrode and a circuit board in the battery controller of Example 2;

Fig. 18 is the assembled state diagram of the inner electrode insulating sheet of the battery controller of Example 2;

19 is a working state diagram of the inner electrode of the controller of Embodiment 2 after bending;

20 is a cross-sectional view of the battery controller of Example 2 cut along the central axis direction;

21 is an assembly state diagram of the controller and the cell of the cylindrical battery shown in Example 3;

22 is an exploded view of the battery controller of Example 3;

Fig. 23 is the assembled state diagram of the positive electrode cap and the circuit board in the battery controller of Example 3;

24 is the structure of the first surface of the circuit board in the battery controller of Example 3;

25 is an assembly state diagram of an internal electrode and a circuit board in the battery controller of Example 3;

26 is a state diagram of the battery controller of Example 3 after glue injection;

27 is a structural diagram of the working state of the inner electrode of the battery controller of Example 3;

28 is an assembly state diagram of the controller and the cell of the cylindrical secondary battery shown in Example 4;

Fig. 29 is the assembled state diagram of the inner electrode in the battery controller of Example 4;

30 is a state diagram of the battery controller of Example 4 after glue injection;

31 is a structural diagram of an internal electrode working state of the battery controller of Example 4;

32 is an outline view of the columnar secondary battery shown in Example 5;

33 is an exploded view of the battery controller of Example 5;

34 is an assembly state diagram of the negative electrode cap and the circuit board in the battery controller of Example 5;

35 is a cross-sectional view of the battery controller of Example 5 cut along the center axis direction;

36 is an external view of the cylindrical secondary battery shown in Example 6;

37 is a cross-sectional view of the battery controller of Example 6 cut along the central axis direction;

38 is an assembled state diagram of the columnar secondary battery shown in Example 7;

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

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

41 is a cross-sectional view of the battery controller of Example 7 cut along the central axis direction;

42 is an outline view of the columnar secondary battery shown in Example 8;

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

FIG. 44 is a view showing the assembled state of the negative electrode cap and the circuit board of Example 8. FIG.

The reference numerals are explained as follows:

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

Cells 200a, 200b, 200c, 200d, 200e, 200g, 200h;

Positive electrodes 230a, 230b, 230c, 230d, 230e of the battery cells;

battery 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 partitions 311a, 311c, 311e, 311g, 311h;

inner electrode pads 312a, 312c;

shell pad 313a;

inner shell pads 314a, 314c;

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

The outer contour 318a of the cap body footprint;

Outer contour 317a of the brim footprint;

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

negative electrode caps 320e, 320h;

caps 321a, 321e;

brim 322a, 322e;

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

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

Bending the positioning groove 332a;

Internal electrode positioning feet 3311a, 3311c;

Internal electrode circuit board welding station 3312a;

open slot 3313c;

Resistance welding choke groove 333a;

Internal electrode cell welding stations 334a, 334b, 334c, 334e;

positioning foot support portion 335a;

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

Controller housings 410a, 410b, 410c, 410d, 410e, 410f, 410g;

outer side wall 411a;

Limiting baffles 412a, 412b;

Inner positioning ring 413a

through hole 4112a;

Controller inner casings 420a, 420b, 420c, 420d, 420e, 420f, 420g;

inner side wall 421a;

outer positioning ring 423b;

the support portion 422a;

Limit bending foot 4221a;

groove 4222a;

transition portion 4422a;

thermally conductive adhesives 430a, 430b;

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

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

Detailed ways

While the present invention may readily be embodied in different forms, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification, while it is to be understood that this specification should be construed as a are illustrative of the principles of the present disclosure, and are not intended to limit the invention to that described herein.

Thus, a reference to a feature in this specification will be used to describe one of the features of an embodiment of the present disclosure and not to imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes a number of features. Although certain features may be combined together to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Thus, unless otherwise stated, the combinations described are not intended to be limiting.

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

The plural in the present invention refers to two or more, and the above and the following all include this number.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this description of the present disclosure will be thorough and complete, and will consolidate the concept of the example embodiments. It will be fully conveyed 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 their repeated descriptions will be omitted.

Before introducing the various embodiments of this application, some battery names, technical terms and battery classifications appearing in this application are briefly summarized.

For the convenience of description, this application divides the battery into two types: N-type battery and P-type battery according to the system integration mode of the controller equipped with the lithium-ion cylindrical secondary battery in the battery (Note: N-type battery and P-type battery belong to This application creates its own acronyms for ease of presentation).

N-type batteries, ie, the battery controller is mounted on the positive electrode end of the battery. The battery shell is the negative electrode for charging input and discharging output of the battery; the positive electrode cap is the positive electrode for charging input and discharging output of the battery.

P-type batteries, that is, the battery controller is installed at the negative end of the battery. The outer shell of the battery is the positive electrode for charging input and discharging output of the battery; the negative electrode cap is the negative electrode for charging input and discharging output of the battery.

The statement of this application involves No. 5 battery and No. 7 battery, which are popular specifications in China. The comparison table between them and other specifications is as follows:

GB/IEC standard American Standard Chinese popular specification standard R6 AA Number 5 1.5V R03 AAA Number 7 1.5V

The statement of this application involves a battery with built-in charge and discharge protection circuits, and is called a "battery" with commercial properties, and a battery that does not have a built-in charge and discharge protection circuit and is an industrial semi-finished product is called a "cell".

In the description of the embodiments, the batteries are divided into "steel-shell lithium-ion cells", "soft-pack lithium-ion cells", "aluminum-shell lithium-ion cells", etc. according to the packaging method of the cells, wherein:

Soft-packed lithium-ion battery: a reference term derived from the well-known abbreviation of the lithium-ion battery industry for a single lithium-ion battery that is packaged with aluminum-plastic film and does not have built-in charge and discharge protection circuits.

Lithium-ion battery with steel shell: It is a reference term, which is derived from the well-known abbreviation of lithium-ion battery which is packaged in metal steel shell and does not have built-in charge and discharge protection circuits in the lithium-ion battery industry.

Aluminum-shell lithium-ion battery: It is a proprietary abbreviation created by this application for the convenience of presentation. It refers to the abbreviation of a single lithium-ion battery that is packaged in a metal aluminum shell and does not have built-in charge and discharge protection circuits.

Statements about the positive and negative electrodes of the cell:

In the lithium-ion battery industry, the sheet-like lead-out electrodes that are welded on the anode or cathode current collector of the lithium-ion battery core are generally called "pole tabs". It is connected to other materials, but as long as the electrode is still in a sheet structure, it is still habitually called "pole tab", such as the positive tab and negative tab of a soft-packed lithium-ion battery; but for steel shell or steel shell lithium For the ion cell, generally only the electrodes drawn from the winding core are called "electrode ears", and the electrodes drawn out of the cell package are called positive electrodes and negative electrodes because they are no longer sheet-like;

In order to facilitate the understanding of the well-known professional concepts and the description of the implementation method, in this application, the lithium-ion battery core lead-out electrode, the soft-pack lithium-ion battery lead-out electrode, the steel-shell lithium-ion battery lead-out electrode, the aluminum-shell lithium-ion battery lead-out electrode, The lead-out electrodes of the cells are collectively referred to as "positive electrodes" or "negative electrodes" according to their electrical polarity.

The preferred embodiments of the present invention will be further elaborated below in conjunction with the accompanying drawings of the present specification.

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

Referring to FIG. 1 and FIG. 2 , the battery 100a mainly includes: a battery cell 200a and a controller 400a. The cell 200a is cylindrical and has a positive cell electrode 230a and a cell negative electrode 220a. The controller 400a is coaxially stacked on the end where the positive electrode 230a of the cell is located, and is packaged together with the No. 5 steel shell cell 200a.

The cell 200a shown in this embodiment is a CID cell, that is, a cell with a current cut-off protection structure. When the 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 cell will automatically open the circuit, and play a protective role.

The outer shell of the battery cell 200a is a steel shell, and the internal structure of the battery core is not the technical problem mainly solved by the present invention, so the description is omitted.

A positive electrode boss electrically connected to the positive electrode 230a is formed at the positive electrode 230a of the No. 5 steel shell cell, the positive electrode boss is sleeved with a cell insulating sheet 233a, and the center of the cell insulating sheet 233a is provided with a through hole, and Through the through hole and the positive electrode boss, the cell insulating sheet 233a is positioned with the positive electrode boss as the center, and is pasted on the outer shell of the cell 200a. When the controller 400a is welded to the cell 200a, the cell insulation is The sheet 233a functions to isolate the positive electrode 230a of the cell and the controller housing. The technical problems mainly solved by the present invention are basically developed around the part of the controller 400a, which will be described in detail below with reference to the accompanying drawings.

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

The circuit board 300a has opposite first and second surfaces, 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 on the first surface of the circuit board by means of a patch, the first surface of the circuit board 300a is provided with an electrode cap pad 310a for welding the positive electrode cap 320a, and the circuit board 300a has a plurality of channels 316a, The vias 316a separate the electrode cap pads into a plurality of pad partitions 311a. The channel 316a here refers to a non-welded structure that cannot be used for welding. The simplest way to form the channel is to arrange pad partitions spaced from each other on the circuit board, and the interval between the pad partitions constitutes the channel 316a. It is also possible to paint insulating solder resist ink or other insulating material layers at the intervals to form channels. Optionally, the height of the surface of the channel is lower than the height of the surface of the pad partition 311a, or the height of the two can be equal.

The electrode cap pad 310a is electrically connected to the charging input terminal and the discharging output terminal of the control circuit of the circuit board 300a. After the positive electrode cap 320a and the electrode cap pad 310a of the circuit board 300a are welded, fixed and electrically connected, the positive electrode cap 320a becomes the positive electrode of the charging input and discharging output of the secondary battery.

Compared with the traditional method of setting pins on the electrode caps, and using the pins to insert the circuit board and welding with the circuit board, the positive electrode cap patch method of the present application can vacate the second surface of the circuit board for layout on the circuit board. The space for the pins enables more circuit components to be arranged on the second surface of the circuit board, so that the circuit components can only be arranged on the second surface of the circuit board, which truly realizes the single-sided layout of circuit components on the circuit board, which greatly reduces the cost of the controller. the overall height to make room for the cell.

In addition, the electrode cap pad is designed as a partition structure, and a channel 316a is formed between adjacent pads, so when the positive electrode cap is placed on the electrode cap pad in a patch manner and passes through the reflow soldering machine, the help in the solder paste Gases from the volatilized flux can diffuse out through the channel 316a. If the electrode cap pad is set to have a structure without partitions and no channels, when the flux of the solder paste on the pad is volatilized, the positive electrode cap 320a is likely to be pushed away, causing the positive electrode cap 320a to be skewed. At the same time, compared with the whole non-partitioned pad, during the soldering 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 each piece of The stress on the surface of the molten solder paste on the pad sub-area 311a is controlled within a certain range, which can effectively suppress the drift of the positive electrode cap when the circuit board and the positive electrode cap 320a pass through the reflow soldering machine. If the solder paste is not applied uniformly, the excess solder paste on the pad can be drained to the isolation groove. Therefore, through the pad partition structure, it can be ensured that the positive electrode cap mounted in the way of PCB board patch is flat and not skewed.

The positive electrode cap 320a is made of nickel-plated iron stamping molding or other conductive metal materials, so that the positive electrode cap 320a can be welded with the electrode cap pad 310a by the PCB board patch and hot air reflow soldering process, and the electrode cap pad 310a can be welded at the same time. 310a can participate in shielding the electromagnetic radiation generated by the control circuit of the circuit board 300a, and conduct heat generated by the control circuit of the circuit board 300a to the outside of the controller to dissipate heat. The positive electrode cap 320a is made of nickel-plated iron stamping or other conductive metal materials, and the structural strength and oxidation resistance conditions of the positive electrode cap 320a can also meet the structural technical requirements for charging input and discharging output positive electrodes of rechargeable batteries.

Optionally, the number of channels 316a is preferably more than three, the channels 316a divide the electrode cap pad 310a into a plurality of pad sub-regions 311a, and each pad sub-region 311a is symmetrically distributed with respect to a center. Therefore, during reflow soldering, the positive electrode cap 320a will be automatically positioned to the center to avoid the reflow soldering offset.

In this embodiment, each channel 316a is a straight channel, and is distributed in a convergent state from the outer circumference of the circuit board 300a toward the center direction. When designing the channel 316a, the virtual center of the channel convergence can be located at a preset position in the center of the positive electrode cap 320a, so that when the positive electrode cap 320a passes through the reflow soldering machine, the channel 316a has a centering effect on the center of the positive electrode cap 320a, so that the The center of the positive electrode cap 320a is automatically guided to a preset position, so as to ensure that the positive electrode cap 320a is accurately positioned on the circuit board 300a and avoid reflow soldering offset.

The positive electrode cap 320a of this embodiment is a hollow electrode cap with an inner cavity, which includes: a cylindrical cap body 321a with one end open and a cap 322a disposed in the circumferential direction of the open 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 brim 322a is perpendicular to the cap wall of the cap body 321a, and the positive electrode cap 320a is buckled on the circuit board 300a with its open end facing the direction of the circuit board 300a. , and is welded with the circuit board 300a through the brim 322a. When the positive electrode cap 320a is welded on the circuit board 300a, the brim 322a of the positive electrode cap 320a covers each pad partition 311a and each channel 316a. The pad sub-regions 311a are distributed into an annular area, the center of the annular region is concentric with the annular brim 322a of the positive electrode cap 320a, so that when passing through the reflow soldering machine, the pad sub-regions 311a and the brim of the positive electrode cap 320a have a centering effect , to ensure that the positive electrode cap 320a does not drift.

When there are many circuit functions and it is impossible to realize single-sided layout of circuit components on the second surface of the circuit board, the circuit components can also be arranged in the inner cavity of the positive electrode cap 320a, so as to control the overall height of the controller to be extremely low. within the range to make room for the cells.

Optionally, the brim 322a and the electrode cap pads on the circuit board 300a are not equal in size. The area where the cap body 321a covers the circuit board is the cap body coverage area (318a in the figure is the outer contour of the cap body coverage area), and the area where the brim covers the circuit board is the brim coverage area (317a in the figure is the outer outline of the cap brim coverage area). The cap body coverage area 318a has a pad blank area, and the outer contour of each pad area 311a is located within the outer contour 317a of the brim coverage area, that is, the outer diameter of the pad area 311a is smaller than the diameter of the outer contour 317a of the brim coverage area. Further, the drift of the positive electrode cap 320a when the circuit board 300a and the positive electrode cap 320a pass through the reflow soldering machine is further suppressed. The inner contour of at least one pad sub-area 311a extends beyond the brim coverage area and extends inwardly into the cap body coverage area, that is, enters the outer contour 318a of the cap body coverage area. Therefore, when the circuit board 300a and the positive electrode cap 320a pass through the reflow soldering machine, The molten solder paste can climb up along the cap wall of the positive electrode cap 320a, thereby increasing the welding strength between the positive electrode cap 320a and the circuit board 300a.

In this embodiment, the circuit board 300a is circular, the positive electrode cap brim 322a is an annular cap brim, the electrode cap pads are annular pads, and the pad partitions are fan-shaped. Therefore, from the figure, the outer diameter of the electrode cap pad annular structure is smaller than that of the positive electrode cap brim 322a, and the inner diameter of the electrode cap pad annular structure is smaller than the inner diameter of the positive electrode cap brim 322a.

Optionally, the central angles formed between the adjacent channels 316a are equal, that is, the central angles of the fan-shaped pad sub-regions 311a are equal, so that the channels 316a are evenly distributed on the circuit board, so that the flux in the solder paste can be eliminated during reflow soldering. The volatilized gas can be uniformly diffused out through the uniformly distributed channels 316a to prevent the positive electrode cap from drifting.

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

The vertical midplane of a circuit board is defined as the vertical plane passing through the center of the circuit board and perpendicular to the circuit board. Optionally, each pad sub-region 311a in this embodiment is symmetrically distributed with the vertical mid-section plane of the circuit board as the symmetry plane, which is conducive to the uniform distribution of solder paste stress on the surface of each pad sub-region 311a, improving the positive electrode cap and the circuit. Concentricity of the plate 300a.

The circuit board 300a is also provided with a glue injection hole 301a and an exhaust overflow hole 302a. The glue injection hole 301a and the exhaust overflow hole 302a are distributed within the outer contour 318a of the cap body coverage area of the positive electrode cap 320a, so that the positive electrode cap The inner cavity of 320a can be filled with thermally conductive glue through the glue injection hole 301a, so as to improve the heat dissipation performance of the circuit board 300a. The function of the exhaust overflow hole 302a is to exhaust air during the pouring process of the thermal conductive glue, and after the cavity formed by the first surface of the circuit board 300a and the positive electrode cap 320a is filled with the thermal conductive glue, the second surface of the circuit board 300a is filled with the thermal conductive glue. overflow. In addition, before the glue injection, the gas in the cavity formed by the positive electrode cap 320a and the first surface of the circuit board 300a is heated and expanded during the reflow soldering of the positive electrode cap 320a due to the increase in temperature. The glue hole 301a and the exhaust overflow hole 302a leak out to balance the air pressure inside and outside the cavity formed by the positive electrode cap 320a and the first surface of the circuit board 300a to avoid when the circuit board 300a and the positive electrode cap 320a pass through the reflow soldering machine The positive electrode cap 320a is deflected by the expanding gas.

Referring to FIGS. 3-8 , the controller 400a further includes a controller casing having an inner cavity, and the circuit board is accommodated in the inner cavity of the controller casing.

Optionally, in this embodiment, the controller housing includes a controller outer housing 410a. The controller housing 410a is made of iron stamping and then nickel-plated, and can also be made of other conductive metal materials.

One end of the controller outer casing 410a has a limiting baffle plate 412a, and the other end is a bottomless tubular open end. The controller outer casing 410a includes: a cylindrical outer side wall 411a and a limiting baffle 412a integrally formed on one axial end of the outer side wall 411a. A through hole 4112a is defined in the center of the limiting baffle plate 412a, and a shell pad 313a for soldering the limiting baffle plate 412a is provided near the outer edge of the first surface of the circuit board 300a. The circuit board 300a is accommodated in the controller housing 410a, and by applying solder paste to the housing pads 313a, the circuit board 300a is attached and fixed to the inner surface of the limit baffle 412a of the controller housing 410a, and is connected with the limit stopper. The board 412a is electrically connected. At this time, the positive electrode cap 320a protrudes through the through hole 4112a of the limiting baffle 412a. The shell pads 313a not only play a role of fixing with the controller shell 410a, but also establish an electrical connection between the controller shell 410a and the circuit board 300a by soldering with solder paste, so that the shell pads 313a and the controller shell 410a are electrically connected. Participate in shielding the electromagnetic radiation generated by the controller 400a together.

In this embodiment, the shell pad 313a is a ring pad, which is beneficial to increase the contact area of the electrical connection between the circuit board 300a and the controller shell 410a, facilitate the passage of a large current, and improve the heat dissipation efficiency of the circuit board 300a. In other embodiments, there may also be a plurality of pads distributed near the outer edge of the first surface of the circuit board 300a.

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

The inner casing 420a of the controller is made of iron stamping and then nickel-plated, and can also be made of other conductive metal materials.

The controller inner casing 420a is coaxially mounted in the controller outer casing 410a. The controller inner casing 420a includes: an annular inner side wall 421a coaxial with the outer side wall 411a of the controller outer casing 410a, and the controller inner casing 420a is welded to the circuit near the outer edge of the second surface of the circuit board 300a. Inner case pads 314a on the second surface of board 300a. The outer shell pads 313a on the first surface of the circuit board 300a and the inner shell pads 314a on the second surface of the circuit board 300a are electrically connected through the circuit board via holes. During installation, solder paste can be applied to the inner shell pads 314a of the circuit board 300a, and then loaded into the controller inner shell 420a, so that one end of the controller inner shell 420a abuts the inner shell pads 314a of the circuit board 300a . The circuit board 300a, the controller inner casing 420a, and the controller outer casing 410a can be connected and fixed by directly heating the controller outer casing 410a and tin welding.

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

On the one hand, the inner casing 420a of the controller can increase the connection strength between the circuit board 300a and the outer casing 410a of the controller; The electrical contact area is favorable for passing a large current and improving the heat dissipation efficiency of the circuit board 300a.

Optionally, referring to FIG. 7 and FIG. 13 , the controller inner casing 420a further includes a support portion 442a formed at one end of the inner side wall 421a and bent toward the central axis of the inner side wall 421a, and the controller inner casing 420a is opposite to the support portion 442a The other end is a bottomless tubular open end. A circular arc chamfer is formed between the support portion 442a and the inner side wall 421a of the inner casing of the controller. The circular arc chamfer forms a transition portion 4422a, the transition portion 4422a is connected to the outer side wall 411a and the inner casing pad of the circuit board 300a. The gaps for depositing solder are formed between 314a.

When the controller inner casing 420a is clamped in the controller outer casing 410a, the support portion 442a of the controller inner casing 420a will squeeze the solder paste on the inner casing pad 314a of the circuit board 300a, and squeeze the solder paste to the In the gap formed between the controller inner casing 420a, the outer side wall 411a of the controller outer casing and the circuit board 300a, and depositing solder paste in the gap, the circuit board 300a, the controller inner casing 420a, the controller outer casing The three bodies 410a are firmly welded.

Specifically, the support portion 422a includes: a plurality of limit bending feet 4221a formed at one end of the inner side wall 421a and distributed along the circumferential direction of the inner side wall 421a. A groove 4222a is formed, one end of the limiting leg 4221a away from the inner side wall is bent toward the center axis of the inner side wall to form an arc-shaped chamfer, and the top of each limiting leg 4221a forms a connection surface that is flat against the inner shell pad 314a.

When the inner casing 420a of the controller is clamped in the outer casing 410a of the controller, the connection surfaces on the tops of the limit bending feet 4221a will squeeze the solder paste on the inner casing pads 314a of the circuit board 300a, so that the solder paste enters the controller In the gap formed between the outer side of the arc chamfering of the limit bending feet 4221a of the inner casing 420a, the outer side wall 411a of the outer casing of the controller and the circuit board 300a, in addition, the solder paste will be squeezed into the adjacent controllers. The groove 4222a between the shell welding feet. Therefore, the circuit board 300a, the controller inner casing 420a, and the controller outer casing 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 casing 410a, and an inter-board gap is formed between the outer circumference of the circuit board 300a and the outer side wall 411a of the controller outer casing 410a, and the first surface of the circuit board 300a and the controller The excess solder paste between the limiting baffles 412a of the outer casing 410a will also be squeezed into the inter-board gap, and fused and bonded with the solder paste on the second surface of the circuit board and the solder paste accumulated in the above-mentioned gap. , to form a firm bonding group, so as to further improve the connection strength between the circuit board 300a, the controller inner casing 420a, and the controller outer casing 410a.

In other embodiments, there may be no grooves 4222a between the above-mentioned limiting legs 4221a, so that the limiting legs 4221a are connected to each other to form a fixed ring. The fixing ring is bent and extended toward the center of the inner side wall, and the curved part of the fixing ring forms a circular arc chamfer. Solder paste is deposited in the gap formed between the outer side walls 411a of the outer casing 410a to firmly connect the circuit board 300a, the inner casing 420a of the controller, and the outer casing 410a of the controller.

In other embodiments, tin wires or tin balls can also be used instead of solder paste, and the gaps or grooves are filled with fluid tin solder after the tin wires or tin balls are melted.

The controller casing of this embodiment adopts the method of clamping the inner casing 420a of the controller and the outer casing 410a of the controller to both sides of the circuit board 300a to fix the circuit board 300a firmly to prevent the battery from being dropped or dropped during the use of the battery. cause the circuit board to collapse. At the same time, since the inner casing 420a of the controller has an annular structure as a whole, it only has the function of fixedly connecting the circuit board around the circuit board 300a, and does not occupy the space of the circuit components in the middle part of the circuit board, ensuring that the circuit board is single-sided. components to control the overall height of the controller to the lowest possible height range. In addition, the double-layer casing structure of the inner and outer casings can also significantly improve the overall anti-electromagnetic shielding effect of the controller, increase the electrical contact area between the circuit board 300a and the controller casing, facilitate the passage of large current, and improve the circuit board 300a. cooling efficiency.

Referring to FIG. 13, the controller outer casing 410a protrudes downwardly beyond the controller inner casing 420a, thereby forming an inner positioning ring 413a. When the controller 400a is fixed to the cell 200a, the outer casing of the cell extends into the inner positioning ring 413a, The inner positioning ring 413a is used for abutting against the outer casing of the cell 200 to ensure that the controller 400a and the cell 200a are installed concentrically and coaxially.

It should be noted that, when the inner casing 420a of the controller and the outer casing 410a of the controller cooperate to fix the circuit board 300a, the circuit board 300a and the limiting baffle 412a of the outer casing 410a of the controller may not be welded. The welding between the inner casing 420a of the controller and the inner casing pad 314a of the circuit board 300a and the welding between the inner casing 420a of the controller and the outer casing 410a of the controller make the outer casing pad 313a on the first surface of the circuit board 300a pressed tightly The inner surface of the limiting baffle 412a realizes that the circuit board 300a is crimped to the limiting baffle 412a of the controller outer casing 410a and establishes an electrical connection therebetween.

Referring to FIG. 3 and FIG. 5 to FIG. 11, the circuit board 300a is further provided with an inner electrode 330a, and the inner electrode 330a is made of conductive metal material. One end of the inner electrode 330a is fixed and electrically connected to the circuit board 300a to form an inner electrode fixing portion 331a. The inner electrode 330a further includes an inner electrode cell formed by bending relative to the inner electrode fixing portion 331a and used to electrically connect the cell 200a. Between the soldering table 334a, the bent inner electrode cell soldering table 334a and the circuit board 300a, a accommodating space for arranging circuit components is formed. Inner Electrode Cell Welding Station The inner electrode cell welding station 334a is exposed to the controller casing through the open end inside the controller and the bottom of the outer casing.

The inner electrode 330a in this embodiment is a single-leg 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 300a. The movable end of the single-legged inner electrode 330a is not connected to the circuit board 300a, so a large space can be freed so that more functional components can be arranged on the second surface of the circuit board 300a.

In other embodiments, if the function of the controller is simple, the circuit components are few, or the diameter of the circuit board 300a is larger due to the battery type, the inner electrode 330a can also be designed in the form of double fixed feet, that is, the inner electrode cell Both ends of the welding table 334a are each designed with an inner electrode fixing portion 331a, so that both ends of the inner electrode cell welding table 334a are fixed ends.

Specifically, the inner electrode cell welding table 334a and the inner electrode fixing portion 331a in this embodiment are integrally formed. The inner electrode fixing portion 331a includes an inner electrode positioning pin 3311a that can be inserted into and soldered on the circuit board 300a, and an inner electrode circuit board soldering table 3312a flatly attached to the surface of the circuit board. The circuit board 300a is provided with inner electrode positioning holes 303a into which the inner electrode positioning pins 3311a are inserted, and inner electrode pads 312a for the inner electrode circuit board welding table 3312a to be flatly attached and welded thereon. The inner electrode pad 312a surrounds the periphery of the inner electrode positioning hole 303a, the inner electrode positioning pin 3311a of the inner electrode fixing part 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 to participate in the tin melting welding , reduce the current density at the welding connection, and ensure the welding position accuracy of the inner electrode 330a and the circuit board 300a.

The inner electrode pad 312a is used as a pad for welding the inner electrode 330a, and is also the connection pad of the positive electrode 230a of the cell of the control circuit on the circuit board 300a. After the inner electrode 330a and the inner electrode pad 312a of the circuit board 300a are welded, fixed and electrically connected, the inner electrode 330a becomes a structural electrode for the positive electrode of the cell 200a to be connected to the control circuit of the circuit board.

When the inner electrode 330a is soldered, the inner electrode positioning pin 3311a is inserted into the inner electrode positioning hole 303a to realize the positioning of the inner electrode 330a and the circuit board 330a. In addition, since the inner electrode positioning hole 303a penetrates through the first surface and the second surface of the circuit board, and the inner electrode positioning hole 303a is exposed to the positive electrode cap 320a and the limiting baffle 412a of the controller case, the rechargeable battery can be assembled when the rechargeable battery is assembled. After completion, the inner electrode positioning hole 303a can also be used as a cell test hole, and a pointed test pen is inserted into the inner electrode positioning hole 303a on the first surface of the circuit board, that is, in contact with the inner electrode 330a. In this way, the positive electrode of the battery cell 200a can be directly electrically connected across the controller 400a to detect the battery cell.

After the inner electrode 330a is bent and formed, the inner electrode fixing portion 331a further includes a positioning foot support portion 335a. The number of the inner electrode positioning feet 3311a is two, which are respectively disposed at one end of the positioning foot support portion 335a near both sides in the width direction and The inner electrode circuit board welding table 3312a is a welding piece formed by integrally extending and bending the positioning foot support 335a. The inner electrode circuit board welding table 3312a is located between the two inner electrode positioning feet. 3311a. The inner electrode circuit board soldering table 3312a is provided with a slot-shaped through hole penetrating through the thickness direction. When soldering, the solder paste is placed in the slot-shaped through hole. When the soldering iron or other welding tool is used to heat the inner electrode circuit board soldering station 3312a, the solder paste melts and extends along the hole wall of the slot-shaped through hole, thereby connecting the inner electrode circuit board. The electrode circuit board soldering stand 3312a is fixed to the circuit board 300a. At the same time, the inner electrode circuit board welding station 3312a also increases the contact area between the inner electrode 330a and the circuit board 300a, which facilitates the passage of a large current and improves the heat dissipation efficiency of the control circuit.

In addition, the inner electrode positioning pin 3311a of the inner electrode 330a is inserted into the inner electrode positioning hole 303a of the circuit board 300a, so that the inner electrode 330a and the circuit board 300a are positioned in the xy direction, and the inner electrode circuit board welding table 3312a abuts against the second circuit board 300a. On the internal electrode pads 312a on the surface, the internal electrodes 330a are positioned in the Z direction of the circuit board 300a. At the same time, the inner electrode circuit board welding station 3312a also increases the contact area between the inner electrode 330a and the circuit board 300a, which facilitates the passage of a larger current and reduces the heat generated by the connection between the inner electrode 330a and the circuit board 300a.

Referring to FIGS. 2 and 5, when the controller 400a is assembled on the positive end of the cell 200a, the internal electrode cell welding table 334a of the internal electrode 330a just falls on the boss of the positive electrode 230a of the cell, and the two are welded together. An electrical connection can be established between the two.

The inner electrode cell welding station 334a is also provided with a resistance welding flow choke groove 333a to increase the current path through resistance welding between the inner electrode cell welding station 334a and the cell positive electrode boss, thereby increasing the welding strength.

Since the cell 200a in this embodiment is a steel-shell cell, and the positive electrode 230a has a boss-type structure, in order to facilitate the welding of the internal electrode cell welding station 334a and the cell 200a, the internal electrode cell welding station in this embodiment The 334a adopts a two-way bend structure.

Referring to FIGS. 10 and 11, the inner electrode cell welding station 334a is formed by the inner electrode fixing portion 331a being integrally extended and then being bent once and then reversely bent twice. The second contact piece is formed by the secondary bending, and the second contact piece and the first contact piece are overlapped with each other. The inner electrode cell welding station 334a is formed at the end of the second contact piece.

A bending positioning slot 332a is respectively provided on both sides of the inner electrode cell welding table 334a in the width direction. When the inner electrode cell welding table 334a is bent, the stress is concentrated at the two bending positioning grooves 332a, which can ensure the welding of the inner electrode cell. The table 334a is folded at the bending positioning groove, so that the second bending positioning is realized by taking the connecting line of the two bending positioning grooves 332a as the folding line, which ensures the consistency of the folding of the inner electrode.

The shape of the movable end of the inner electrode 330a in this embodiment is a long strip. Since the battery in this embodiment is an AA battery, the diameter of which is larger than that of the AA battery, the diameter of the circuit board is also larger, so the inner electrode 330a and the inner electrode cell can be designed with wider widths. welding table 334a, so that the width of the movable end of the elongated inner electrode 330a can meet the requirements for welding with the positive electrode boss of the battery cell. Using the movable end of the elongated inner electrode 330a can save materials, simplify the manufacturing process, and reduce the process cost.

Referring to FIGS. 8-11 , the inner cavity of the controller housing is filled with thermally conductive adhesive 430a made of insulating material. When pouring the thermal conductive glue, place the controller in a vacuum environment with the positive electrode cap facing down, pour the pre-prepared thermal conductive glue into the controller through the glue injection hole 301a of the circuit board 300a, and the thermal conductive glue 430a is filled with the circuit board 300a The inner cavity formed by the first surface and the positive electrode cap 320a is then overflowed from the exhaust overflow hole 302a to the inner cavity formed by the second surface of the circuit board 300a and the outer casing 410a of the controller, and is continuously poured until the glue plane reaches the first submerged circuit board 300a. After the position of the circuit components on the two surfaces, the controller is taken out. The cured thermally conductive adhesive 430a can protect the circuit components in the controller on the one hand, and conduct heat generated by the control circuit in the controller to the controller on the other hand. The main heat conduction medium of the outer casing 410a of the controller and the positive electrode cap 320a is used to improve the heat dissipation efficiency of the controller, reduce the temperature difference between the inside and the outside of the controller, improve the charging or discharging temperature control accuracy of the controller, and improve the structural strength of the controller, The structure sealing of the controller is realized, and the adaptability and reliability of the charging and discharging working environment of the battery are improved.

The thermally conductive adhesive 430a is a thermosetting colloid, which can be modified by mixing dicyandiamide into epoxy resin to be a single-component thermosetting colloid, and then mixed with thermally conductive powder materials such as aluminum nitride or boron nitride to modify it into a single-component thermosetting colloid. Thermally conductive colloid formulation is realized.

In other embodiments, the thermally conductive adhesive 430a can also be modified into a thermally conductive adhesive by using other colloids such as thermosetting benzoxazine, and mixing with other thermally conductive powder materials such as aluminum nitride or boron nitride.

The pouring process of the thermally conductive adhesive 430a can also be implemented by pouring the thermally conductive glue in a normal pressure environment, and after the pouring is completed, put it into a vacuum oven and realize the process of heating, removing air bubbles, and leveling.

The inner electrode cell welding station 334a is exposed outside the thermally conductive adhesive 430a, and the movable end of the inner electrode cell welding station 334a is exposed by the opening at the bottom of the controller casing, so as to facilitate the electrical connection of the cells 200a. The surface of the thermally conductive adhesive 430a is also 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. The inner electrode insulating sheet 440a is provided with an escape groove corresponding to the inner electrode fixing portion 331a. The inner electrode insulating sheet 440a avoids the situation that the inner electrode cell welding table 334a contacts and short-circuits with the electronic components on the circuit board 300a after being bent. In addition, the cured thermally conductive adhesive 430a can also provide positioning for the inner electrode cell welding station 334a, so that the inner electrode cell welding station 334a in the suspended state is blocked by the thermally conductive adhesive 430a and the battery cell 200a on both sides in the axial direction of the controller. , to keep it as relatively stable as possible in the state of use.

During implementation, the thermally conductive adhesive 430a can be poured into the controller first. At this time, the thermally conductive adhesive 430a is in a gel state with a flat surface, and the inner electrode insulating sheet 440a is placed on the glue plane in the gel state to ensure the inner electrode insulating sheet 440a. The overall flatness of the controller is then put into the oven for heating and curing of the thermally conductive adhesive. The cured thermally conductive adhesive 430a is closely adhered to the inner electrode insulating sheet 440a to form an integral body with the overall controller.

The inner electrode insulating sheet 440a can be made of insulating materials such as highland barley paper, ABS, PC, and PET.

In other embodiments, the inner electrode insulating sheet 440a can also be manufactured as a structure with an adhesive backing, which is then mounted on the thermally conductive adhesive 430a after the thermally conductive adhesive is cured.

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, and the positive electrode cap 320a is exposed to the electrode cap insulating sheet 450a through the through hole In addition, the electrode cap insulating sheet 450a covers the brim 322a of the positive electrode cap 320a and the outer surface of the limiting baffle 412a of the controller outer casing, and covers the inner surface of the first surface of the circuit board for inserting and connecting the inner electrode 330a. Electrode positioning hole 303a.

The electrode cap insulating sheet 450a can be made of insulating materials such as PC, PET, ABS, etc., and can be backed with adhesive, so that it can be pasted on the brim 322a of the positive electrode cap 320a and the outer surface of the limiting baffle 412a of the The electrode cap 320a is insulated from the controller case.

4 to 12 are the assembly sequence diagrams of the controller 400a. When the controller 400a is assembled, each circuit component is first soldered on the second surface of the circuit board, and then the positive electrode cap 320 is soldered to the first surface of the circuit board. Then insert the inner electrode 330a into the inner electrode positioning pin 3311a of the circuit board 300a, solder one end of the inner electrode 330a to the circuit board 300a, and then put the circuit board 300a from the open end of the controller outer casing 410a into the controller outer casing 410a In the inner cavity of the circuit board 300a, make the circuit board 300a abut against the limit baffle 412a of the outer casing 410a of the controller, and weld the circuit board to the limit baffle 412a through the shell pads 313a on the first surface of the circuit board 300a, and then control the The inner casing 420a of the controller is installed into the outer casing 410a of the controller, so that the limit bending feet 4221a of the inner casing 420a of the controller are pressed against the peripheral edge of the second surface of the circuit board to heat the controller, using the outer casing of the first surface of the circuit board 300a The solder paste pre-painted on the solder pads 313a and the inner shell pads 314a on the second surface is melted and the circuit board 300a, the controller outer casing 410a and the controller inner casing 420a are fixedly connected, and then the open end of the controller is connected. Face up, pour the thermally conductive adhesive 430a into the inner cavity of the controller, then place the inner electrode insulating sheet 440a, and then bend the inner electrode 330a from the submerged part of the thermally conductive adhesive 430a, and the part submerged by the thermally conductive adhesive 430a is fixed for the inner electrode The active end of the foot 331a, which is not submerged by the thermally conductive glue, constitutes the inner electrode cell welding table 334a, and the inner electrode cell welding table 334a is reversely bent again to form the folded state when the inner electrode 330a is in operation; Put the electrode cap insulating sheet 450a through the cap body of the positive electrode cap 320a and place it on the surface of the limiting baffle 412a and the positive electrode cap brim 322a of the controller outer casing 410a, and bond with the limiting baffle 412a and the positive electrode cap brim 322a .

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

The technical effect of the N-type No. 5 steel shell lithium-ion secondary battery of the present embodiment is as follows:

(1) Reduce the height of the charge and discharge controller and increase the specific energy of the rechargeable battery.

By using the PCB board patch and hot air reflow process to weld and fix the positive electrode cap, and use the single-end connection of the inner electrode to the circuit board, the space of the circuit board can be saved, so that the circuit components can be distributed on one side of the circuit board. , thereby reducing the overall height of the charge-discharge controller, making more space for the steel-shell lithium-ion battery with CID and increasing the capacity of the battery, thereby increasing the volume specific energy of the rechargeable battery.

(2) The cooperation between the outer casing of the controller and the inner casing of the controller improves the structural strength of the charge-discharge controller.

The circuit board is clamped between the outer casing of the controller and the inner casing of the controller, and the structure that the inner casing of the controller has a support part improves the overall structural strength of the controller and the overall electromagnetic properties of the controller. shielding effect.

(3) Simplify the structure and process of the charge and discharge controller to reduce the cost of the rechargeable battery.

By using the PCB board patch and hot air reflow process to install and fix the positive electrode cap, design the electronic components on one side of the circuit board, use a single end to connect the inner electrode to the circuit board and fold it in the later stage The structure and process design simplifies the charging process. The structure and manufacturing process of the discharge controller reduce the material cost and manufacturing cost of the charge and discharge controller.

(4) Improve the adaptability and reliability of charging and discharging of the secondary battery.

The packaging method of pouring thermal conductive glue in the controller improves the heat dissipation rate of the circuit board control circuit, reduces the temperature difference between the inside and the outside of the controller, improves the control accuracy of charge and discharge temperature, improves the structural strength of the controller, and realizes the structure of the controller. It is sealed, which improves the adaptability and reliability of the charging and discharging working environment of the secondary battery.

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

Using the PCB board patch and hot air reflow process to install and fix the positive electrode cap, and design the circuit components on one side of the circuit board, it is easier to realize the thick film of the circuit board, thereby simplifying the manufacturing process and reducing costs.

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

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

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

The battery cell 200b in this embodiment is a soft-packed lithium-ion battery cell, which is also in a cylindrical shape as in the above-mentioned embodiment, and has a cell positive electrode 230b and a cell negative electrode 220b respectively.

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

The positive electrode 230b of the cell is a tab structure with a certain length. After the negative electrode 220b of the cell is extended, it is bent toward the end of the positive electrode of the cell 220b against the outer shape of the cell.

The battery controller is coaxially stacked on the end where the positive electrode 230b of the battery cell is located, and the battery cell 220b and the controller 400b are packaged together through the battery outer casing 110b.

During assembly, the battery cell 220b is firstly inserted into the battery outer casing 110b with the negative electrode 220b of the battery cell facing the closed end of the battery outer casing 110b. Using conventional resistance welding or laser welding methods, the negative electrode 220b of the battery cell is welded to the battery outer shell 110b at the open end of the battery shell 110b to be fixed and electrical connection is established, and then the inner electrode cell of the inner electrode 330b of the controller 400b is The welding station 334a and the positive electrode 230b of the battery are overlapped and welded together, and finally the casing of the controller 400b is welded to the open end of the battery outer casing 110b, ie, the battery packaging is realized.

The design method of the controller matched with the secondary battery formed by the soft-packed lithium ion cell in this embodiment is basically the same as that of the controller matched with the secondary battery formed by the steel shell lithium ion cell of the above-mentioned Embodiment 1. The difference in the design method caused by the difference in technical requirements is mainly that: the controller inner casing 420b and the controller outer casing 410b of the controller 400b matched with the soft-packed lithium-ion battery in this embodiment form an outer positioning ring 423b, In order to be assembled and positioned with the battery outer casing 110b; the inner electrode 330b is short and bent only once.

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

Like the above-mentioned Embodiment 1, the controller 400b of this embodiment also includes a controller outer casing 410b, an inner controller casing 420b, a circuit board 300b, a positive electrode cap 320b, an inner electrode 330b, an inner electrode insulating sheet 440b, and an electrode cap Insulating sheet 450b.

Like the above-mentioned first embodiment, the inner electrode 330b of this embodiment also includes an inner electrode fixing portion 331b and an inner electrode cell welding stand 334b. The structure of the inner electrode fixing portion 331b is the same as that of the above-mentioned Embodiment 1, and will not be repeated here. The inner electrode cell welding table 334b is shorter than the above-mentioned Embodiment 1, and is bent only once. That is, the inner electrode cell welding table is formed by extending the inner electrode fixing portion 331b integrally and then bending it once.

Referring to FIG. 20, the controller inner casing 420b of this embodiment is not retracted from the controller outer casing 410b, but extends outward from the controller outer casing 410b, thereby forming an outer positioning ring 423b. When the controller 400b When fixed on the battery cell 200b, the outer positioning ring 423b can extend into the battery outer casing 110b and abut against the battery outer casing 110b to ensure that the controller 400b is installed concentrically and coaxially with the battery cell 200b and the battery outer casing. During the welding process between the body 410b and the battery case 110b, the outer positioning ring 423b also prevents the welding flame or welding slag from entering the battery case 110b and damaging the lithium ion cells.

When assembling the inner electrode 330b, firstly weld the inner electrode 330b on the circuit board 300b as shown in FIG. As shown in 18, pour the thermally conductive adhesive 440b and place the inner electrode insulating sheet 440b, then bend the inner electrode 330b from the submerged place of the thermally conductive adhesive 430b as shown in FIG. 19, and then, as shown in FIG. The cap body passing through the positive electrode cap 320b is placed on the surface of the limiting baffle 412b and the positive electrode cap brim 322b of the controller housing 410b, and is bonded to the limiting baffle 412b and the positive electrode cap brim 322b.

Compared with Embodiment 1, the inner electrode 330b in this embodiment is shorter and only bent once, which reduces the structural materials of the rechargeable battery, simplifies the manufacturing method, and reduces the process cost.

Example 3, N-type No. 7 steel shell lithium ion secondary battery.

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

The structure of the secondary battery in this example is similar to that in Example 1, the difference is that Example 1 is a No. 5 battery, and this example is a No. 7 battery. Since the diameter of the No. 7 battery is smaller than that of the No. 5 battery, the controller There will be slight differences in design, mainly as follows: the movable end of the inner electrode 330c of the controller 400c of the No. 7 steel case lithium-ion secondary battery in this embodiment 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 in this embodiment is a steel-shell lithium-ion battery cell, which is also in the shape of a cylinder as in the above-mentioned embodiment 1, and has a battery cell positive electrode 230c and a battery cell negative electrode 220c. The controller 400c is disposed at the end where the positive electrode 230c of the cell is located.

Referring to FIG. 22, the controller 400c of this embodiment also includes a controller outer casing 410c, a controller inner casing 420c, a circuit board 300c, a positive electrode cap 320c, an inner electrode 330c, an inner electrode insulating sheet, as in the above-mentioned first embodiment. 440c and the electrode cap insulating sheet 450c.

Referring to FIGS. 23 and 24 , since the diameter of the AAA battery in this embodiment is smaller, the diameter of the controller 400c is also smaller, and accordingly the diameter of the circuit board 300c is also smaller, and some of the circuit boards 300c are conducting The diameters of the via holes on the first surface and the second surface of the circuit board are also small. In order to avoid the holes being blocked by the solder paste during the process of applying solder paste before reflow soldering, it is better to design the pads with the pads Avoid holes as much as possible.

The electrode cap pad 310c of this embodiment is also divided into a plurality of pad sub-regions 311c by each channel 316c, and each pad sub-region 311c is an asymmetric structure. At each via hole, each pad sub-region 311c is designed with a corresponding avoidance structure , each pad sub-region 311c is also designed with an avoidance structure near the glue injection hole 301 and the exhaust overflow hole 302c, so that each pad sub-region 311c presents an irregular structure as a whole.

However, since the electrode cap pad 310c in this embodiment is also divided into a zoned structure by a plurality of channels 316c, when the positive electrode cap is placed on the electrode cap pad in a patch manner and passes through the reflow soldering machine, the solder paste The volatilized gas from the flux in the solder can diffuse out through the channel 316c, and the partition structure of the pad can disperse the stress on the surface of the solder paste, and release the stress through the channel 316c, so that the melted solder paste on each pad partition 311c can be absorbed. The stress on the surface is controlled within a certain range, which can effectively suppress the drift of the positive electrode cap when the circuit board 300c and the positive electrode cap 320c pass through the reflow soldering machine, and ensure that the positive electrode cap mounted by the PCB board is flat and not skewed.

25 to 27, which are the assembly sequence diagrams of the inner electrode 330c of this embodiment. The inner electrode 330c of this embodiment is similar to the inner electrode 330a of Embodiment 1, both of which are two-folded structures. The difference is: In this embodiment, the movable end of the inner electrode cell welding table 334c is circular, and the shape of the inner electrode circuit board soldering table 3312c of the inner electrode fixing portion 331c is also different.

The inner electrode 330c of this embodiment also includes an inner electrode fixing portion 331c and an inner electrode cell welding stand 334c. The inner electrode cell welding table 334c is a two-folded structure, so as to be conveniently connected to the positive electrode 230c of the steel shell cell in the shape of a boss. The movable end of the inner electrode cell welding table 334c is round, the purpose is to increase the area of the movable end of the inner electrode cell welding table 334c, thereby facilitating welding with the positive electrode boss of the cell 200c and improving the welding of the inner electrode cell The contact area between the movable end of the stage 334c and the positive electrode boss of the cell 200c.

The inner electrode fixing portion 331c includes: two inner electrode positioning pins 3311c and an inner electrode circuit board welding table 3312c located between the two inner electrode positioning pins 3311c and parallel to the circuit board 300c. The inner electrode circuit board soldering table 3312c is bent into an L shape, the end of the inner electrode circuit board soldering table 3312c is crotch-shaped, and an opening groove 3313c is formed on the edge of the inner electrode circuit board soldering table 3312c. Two conductive flanges are formed on the side, and the lengths of the two conductive flanges are different. The inner electrode positioning pins 3311c are the same as those in the above-mentioned Embodiment 1 and Embodiment 2, and will not be repeated here.

The circuit board 300c is provided with an inner electrode pad 312c for soldering the inner electrode 330c, and an inner electrode positioning hole 303C is arranged 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 is fixed and electrically connected to the inner electrode pad 312c by solder. The inner electrode circuit board welding table 3312c is flatly attached to the inner electrode pad 312c and It is fixed and electrically connected to the internal electrode pad 312c by solder. During soldering, since the soldering station 3312c of the inner electrode circuit board is in the shape of a crotch, the solder will extend along the opening groove 3313c and the periphery of the two conductive flanges, which enhances the connection strength between the inner electrode 330c and the circuit board 300c, and at the same time the inner electrode circuit The board welding stage 3312c also increases the contact area between the inner electrode 330c and the circuit board 300c, which facilitates the passage of a large current and improves the heat dissipation efficiency of the control circuit.

In addition, the second surface of the circuit board 300c of the present embodiment is used for soldering the inner shell pads 314c of the controller inner shell 420c. There are a plurality of pads 314c in an irregular structure, which are respectively arranged at the circumferential edge of the circuit board 300c at intervals. This makes it possible to free up more space for arranging circuit components on the second surface of the circuit board, realize single-sided arranging circuit components on a circuit board with a smaller diameter, and reduce the total axial height of the controller.

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

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

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

The battery cell 200d in this embodiment is a soft-packed lithium-ion battery cell, which, like the above-mentioned second embodiment, also has a cylindrical shape, and has a battery cell positive electrode 230d and a battery cell negative electrode. The controller 400d is disposed at the end where the positive electrode 230d of the cell is located.

The structure of the secondary battery in this example is similar to that in Example 2, the difference is that Example 2 is a No. 5 battery, and this example is a No. 7 battery. Since the diameter of the No. 7 battery is smaller than that of the No. 5 battery, the controller There will be slight differences in design, mainly as follows: the movable end of the inner electrode 330d of the controller 400d matched with the No. 7 soft-pack lithium ion secondary battery in this embodiment is circular.

The inner electrode 330d of this embodiment also includes: an inner electrode fixing portion 331d and an inner electrode cell welding table 334d. The structure of the inner electrode fixing portion 331b is the same as that of the above-mentioned Embodiment 1, and will not be repeated here. The inner electrode cell welding table 334b is shorter than the above-mentioned Embodiment 1, and is only bent once, which is convenient for lap welding with the elongated cell positive electrode 230d of the soft-packed lithium ion cell. In addition, the movable end of the inner electrode 330d is round, which increases the contact area with the positive electrode 230d of the cell, which is beneficial for welding and passing a large current between the two.

The structure of the inner electrode fixing portion 331d of the inner electrode 330d of this embodiment is the same as the structure of the inner electrode fixing portion 331c of the above-mentioned Embodiment 3, that is, it also includes two inner electrode positioning legs and an inner electrode circuit located between the two inner electrode positioning legs. The board welding station and the inner electrode circuit board welding station are also in the shape of a crotch. The specific structure and technical effect of the inner electrode circuit board welding station have been described in detail in the above-mentioned Embodiment 3, and will not be repeated here.

Example 5, P-type No. 5 aluminum-shell lithium-ion secondary battery.

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

The battery 100e also includes two parts: the battery cell 200e and the controller 400e.

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

The biggest difference between this embodiment and the above-mentioned Embodiments 1-4 is that the controller 400e in this embodiment is arranged at the end where the negative electrode of the cell is located. Correspondingly, the positive electrode cap on the first surface of the circuit board in the controller 400e is replaced with a diameter of The larger negative electrode cap 320e, after the battery is assembled, the negative electrode cap 320e is exposed at one end of the battery 100e, the inner electrode cell welding station of the inner electrode contacts and is electrically connected to the negative electrode boss of the battery cell, and the controller case is connected to the negative electrode boss of the battery cell. The aluminum shell of the cell is connected, and the other end of the battery 100e opposite to the negative electrode cap 320e is the positive electrode cap 230e of the convex type of the cell.

Specifically, referring to FIGS. 33 to 35 , the controller 400e of this embodiment includes: a controller outer casing 410e, a controller inner casing 420e, a circuit board 300e, a negative electrode cap 320e, an inner electrode 330e, and an inner electrode insulating sheet 440e And the electrode cap insulating sheet 450e.

The controller outer casing 410e, the controller inner casing 420e, the inner electrode 330e, the inner electrode insulating sheet 440e, and the electrode cap insulating sheet 450e are all the same as those in the above-mentioned Embodiment 1, and will not be repeated here.

The negative electrode cap 320e of this embodiment is also a hollow electrode cap with an inner cavity, including a cylindrical cap body 321e with one end open and a ring-shaped cap 322e disposed in the circumferential direction of the open end of the cylindrical cap body. The cap body 321e includes a cylindrical cap wall and a cap top closed at one end of the cap wall, the cap brim 322e is perpendicular to the cap wall of the cap body 321e, and the negative electrode cap 320e is buckled on the circuit board 300e with its open end facing the direction of the circuit board 300e. , and is soldered to the circuit board 300e through the brim 322e. Compared with the positive electrode cap 320a, the diameter of the cap body of the negative electrode cap 320e is larger, and the radial dimension of the cap brim 322e is smaller.

The electrode cap pad 310e of the negative electrode cap 320e is soldered on the circuit board 300e. The circuit board 300e is also provided with a plurality of channels 316e, and each channel 316e separates the electrode cap pad 310e into a plurality of pad partitions 311e.

Optionally, the number of pad partitions 311e is more than three, and the number of pad partitions 311e is eight in this embodiment. Each pad partition 311e encloses an annular area. When the negative electrode cap 320e is soldered to the circuit board 300e, the brim 322e of the negative electrode cap 320e covers each channel 316e and each pad partition 311e. Therefore, when the negative electrode cap 320e is placed on the electrode cap pad 310e in a patch manner and passes through the reflow soldering machine, the volatilized gas from the flux in the solder paste can diffuse out through the channel 316e and reduce the stress on the surface of the solder paste. Spread out, and release the stress through the channel 316e, so that the surface stress of the molten solder paste on each pad partition 311e is controlled within a certain range, which can effectively suppress the positive electrode when the circuit board 300e and the positive electrode cap 320e pass through the reflow soldering machine. In the case of cap drift, ensure that the positive electrode cap mounted by the PCB board patch is flat and not skewed.

The circle center of the annular area enclosed by each pad partition 311e is concentric with the brim 322e of the negative electrode cap 320e, so that when passing through the reflow soldering machine, each pad partition 311e and the brim of the negative electrode cap 320e have a centering effect to ensure the negative electrode The cap 320e does not drift.

In this embodiment, when the controller 400e and the cell 200e are packaged into one body, the inner electrode 330e of the controller 400e is in contact with the negative electrode of the cell and establishes electrical connection. There are corresponding changes. In other embodiments, the controller 400e can also be encapsulated at the negative electrode end of the cell, but insulation is provided between the inner electrode 330e of the controller 400e and the negative electrode of the cell, and the inner electrode 330e of the controller 400e passes through a wire or a conductive sheet Connected to the positive electrode 230e of the cell, at this time, the control circuit of the controller 400e can use the controller circuit of the above-mentioned Embodiments 1-4.

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

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

Like the P-type No. 5 aluminum-shell lithium-ion secondary battery of the above-mentioned embodiment 5, the controller of the secondary battery of this embodiment is also packaged at the negative electrode end of the battery cell.

Different from the above-mentioned Embodiment 5, the cell in this embodiment is a soft-packed cell. Put it into a battery shell, the positive electrode sheet is welded with the battery shell, the controller shell is connected with the battery shell, the negative electrode provided at the other end of the cell is a negative electrode sheet, and the negative electrode sheet is electrically connected to the inner electrode of the controller 400f. Core welding station connection.

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

Different from the above-mentioned Embodiment 5, the inner electrode 330f of the controller of this embodiment is a short structure suitable for soft-packed cells, and the inner electrode cell welding table 334f is formed by one bending, so as to be compatible with the soft-packed electric cell. The negative electrodes of the long-tab-type cells of the core are matched and overlapped to establish an electrical connection.

Example 7, N-type No. 5 steel shell lithium ion secondary battery (positive electrode cap is solid).

38 to 41 are structural diagrams of the controller of the N-type No. 5 steel-shell lithium-ion secondary battery of the present embodiment.

The secondary battery 100g of this embodiment is similar to the secondary battery 100a of the above-mentioned Embodiment 1. The controller 400g of this embodiment is also packaged at the positive electrode end of the battery cell 200g. Cell insulation sheet 233g.

The difference between the secondary battery 100g of this embodiment and the secondary battery 100a of the above-mentioned Embodiment 1 is that the positive electrode cap 323g on the controller 400g of this embodiment is a solid structure, and correspondingly, the solid positive electrode cap 323g on the circuit board 300g is used for welding. The shape of the pads of the electrode cap 323g is also slightly different. Other structures, such as: the controller inner casing 420g, the controller outer casing 410g, the inner electrode 330g, the inner electrode insulating sheet 440g and the electrode cap insulating sheet 450g are all the same as the above-mentioned embodiment. 1 is the same, so the description of the same structure is omitted in this embodiment.

The positive electrode cap 323g is a solid disc or a solid cylinder, the first surface of the circuit board 300g is provided with an electrode cap pad 310g for welding the electrode cap 323g, and the electrode cap pad 310g is located in the area of the circuit board covered by the solid electrode cap 323g . The first surface of the circuit board 300g is provided with a plurality of channels 316g, and each channel 316g divides the electrode cap pad 310g into a plurality of pad partitions 311g. The function of the channel 316g is the same as the function of the channel in the above-mentioned Embodiment 1, and is used to prevent 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 convergent state from the outer circumference of the circuit board 300g toward the center direction. The channels 316g meet at the center of the circular circuit board 300g, and the extending direction of the channels 316g is consistent with the radial direction of the circuit board 300g. Thus, the channel 316g is aligned with the electrode cap 323g to form an automatic centering effect, and the electrode cap 323g is automatically centered on the center of the circuit board 300g.

In this embodiment, each channel 316g converges in the center, so that each pad partition 311g has a fan-shaped structure. In other embodiments, the channel 316g can also be designed as a center-converging structure, for example, the channel 316g in Embodiment 1 only has a convergent structure. At this time, each pad partition 311g is distributed into an annular area. This structure can also have a centering effect on the positive electrode cap 323g during reflow soldering, ensuring that the positive electrode cap is concentric with the circuit board 300g. Shaft welding.

Optionally, each pad partition 311g has a center-symmetric structure with respect to the center of the circuit board, so that the soldering stress on the circuit board 300g is distributed more evenly, and the flatness of the circuit board soldering is ensured.

Since the solid bottom surface of the solid positive electrode cap 323g in this embodiment can be used as the welding surface for the soldering circuit board 300g, the solid positive electrode cap 323g has the brim structure removed, and its radial dimension is smaller, reducing the circuit occupied by the positive electrode cap 323g The area of the first surface of the board 300g can free up space on the first surface for arranging other functional circuit components. In addition, the manufacturing process of the solid positive electrode cap 323g is simple, and it only needs one stamping process to form, which saves the manufacturing cost.

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

Referring to FIGS. 42 to 44 , the secondary battery of this embodiment is similar to the secondary battery of the above-mentioned embodiment 7, the difference is that the embodiment 7 is a No. 5 battery, and this embodiment is a No. 7 battery, which is smaller in size; , the controller 400h of this embodiment is installed at the end of the negative electrode of the battery cell 200h, and the electrode cap on the controller 400h is replaced with a solid negative electrode cap 323h. The negative electrode cap 323h is exposed outside the battery and is opposite to the positive electrode cap 320h of the positive electrode of the battery cell 200h. The positive electrode cap 320h serves as the charging input and discharge output of the battery 100h, and the negative electrode cap 323h serves as the charging input and discharge output of the battery 100h. end.

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

The negative electrode cap 323h in this embodiment has a solid structure, and the radial dimension and axial height of the negative electrode cap 323h can be designed as required to make it a solid disc or solid cylindrical shape. The circuit board 300h is provided with an electrode cap pad 310h for soldering the solid negative electrode cap 323h. Different from the above-mentioned Embodiment 7, the electrode cap pad 310h of this embodiment has an asymmetric structure, and each pad partition 311h is on the corresponding circuit An avoidance structure is provided at the position of each via hole of 1 . The channel 316h of this embodiment is the same as that of the above-mentioned embodiment 7, and the technical effect thereof is also referred to the above-mentioned embodiment 7, which will not be repeated here.

In other embodiments, there may be only one channel on the circuit board. In this case, the electrode cap pad may be in the form of a notch ring broken by the channel. When the electrode cap patch is soldered on the circuit board, the electrode cap at least partially covers the channel and the electrode cap. The electrode cap pads, that is, the electrode caps corresponding to the channels and the electrode cap pads have solid structure coverage.

When the number of channels is one and the channel is a straight channel, the electrode cap pads may also be two opposite and symmetrically distributed semicircles, or two opposite and symmetrically distributed half-rings.

When the number of channels is one, the channel can also be S-shaped. At this time, the electrode cap pad is divided by the channel into two pad partitions that are symmetrically distributed in the center and similar to a Tai Chi pattern.

When the number of channels is multiple, each channel may also converge in a center in a vortex shape, or each channel may be distributed in a converging state in a vortex shape but not converge in a center.

Above, regardless of whether the electrode cap is a positive electrode cap or a negative electrode cap, solid or hollow, all the above-mentioned electrode cap pad shapes can be applied, which can disperse the surface stress of the solder paste and volatilize the flux during the electrode cap patch welding. The effect of gas diffusion ensures that the electrode cap does not skew or drift during reflow soldering.

The structural features of the above embodiments can also be applied to batteries of different models and types by crossing each other as required, 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 to be understood that the terms used are of description and illustration, and not of limitation. Since the present invention can be embodied in various forms without departing from the spirit or essence of the present invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be broadly within the spirit and scope defined by the appended claims Therefore, all changes and modifications that come within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims (18)

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

a circuit board, comprising: the circuit board comprises a first surface and a second surface which are opposite, wherein a circuit component is welded on the second surface;

the electrode cap is made of conductive metal and is welded on the first surface of the circuit board in a patch 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.

2. The battery controller of claim 1, wherein the number of channels is one, the electrode cap pad is in the form of a broken ring interrupted by channels, and the electrode cap at least partially covers the channels and the electrode cap pad.

3. The battery controller of claim 1, wherein the channel divides the electrode cap pad into at least two pad sections, each pad section being symmetrically distributed with respect to a center.

4. The battery controller of claim 3, wherein said channel is S-shaped, and said electrode cap pad is divided by said channel into two pad sectors that are symmetrically centered.

5. The battery controller of claim 1, wherein each of said channels converges from an outer periphery of said circuit board toward a center of said circuit board.

6. The battery controller according to claim 1, wherein the number of the pad segments is two or more, each pad segment surrounds an annular region concentric with the outer contour of the electrode cap, the pad segments are fan-shaped, and each pad segment is symmetrically distributed with respect to a vertical bisector plane of the circuit board as a symmetry plane.

7. The battery controller of claim 1, wherein the electrode cap is a hollow electrode cap having an internal cavity, the electrode cap comprising: the electrode cap comprises a cylindrical cap body with an opening at one end and a cap peak arranged on the circumference of the opening end of the cap body, wherein the opening end of the electrode cap faces the circuit board.

8. The battery controller of claim 7, wherein the area of the cap covering the circuit board is a cap covering area, the area of the visor covering the circuit board is a visor covering area, an outer contour of each of the pad sections is located within the outer contour of the visor covering area, and an inner contour of at least one of the pad sections extends inward into the cap covering area beyond the visor covering area.

9. The battery controller according to claim 7, wherein 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 cap body covering area, and the cavity of the electrode cap is filled with heat-conducting glue through the glue injection hole.

10. The battery controller of claim 1, wherein the electrode cap is a solid disc or a solid cylinder, the electrode cap pad is located in an area of the circuit board covered by the electrode cap, and the vias meet at a center of the circular circuit board.

11. The battery controller according to claim 9, wherein the channels are straight channels, the central angles formed between adjacent channels are equal, the land partitions are uniformly and equally distributed on the circuit board, the electrode caps are positive electrode caps or negative electrode caps, the channels intersect at the center of the circular circuit board, the extending direction of the channels is the same as the radius direction of the circuit board, and the land partitions are fan-shaped.

12. The battery controller of claim 1, wherein the battery controller has only one of the circuit boards, and the circuit components are distributed only on the second surface of the circuit board, or on both the second surface of the circuit board and the portion of the first surface of the circuit board covered by the electrode cap.

13. A cylindrical secondary battery, characterized by comprising:

the battery cell is cylindrical and is provided with a positive electrode and a negative electrode; and the number of the first and second groups,

the battery controller according to any one of claims 1 to 12, wherein the battery controller is coaxially stacked on the positive electrode terminal or the negative electrode terminal of the battery cell and integrally packaged with the battery cell.

14. The cylindrical secondary battery of claim 13, wherein the battery controller further comprises 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 outside the controller housing, the second surface of the circuit board is further electrically connected to an inner electrode, the inner electrode is made of a conductive material and has an inner electrode cell welding table exposed outside the controller housing, and the inner electrode cell welding table is welded and electrically connected to a positive electrode or a negative electrode of the cell.

15. The cylindrical secondary battery of claim 14, wherein the battery cell is a flexible package battery cell, a negative electrode 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 in a battery outer shell, the negative electrode plate is welded with the battery outer shell, and the controller shell is connected with the battery outer shell;

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

16. The cylindrical secondary battery of claim 14, wherein the casing 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 housing is connected with the steel shell;

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

17. The cylindrical secondary battery of claim 14, wherein the battery cell is a flexible package battery cell, a positive electrode 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 in a battery shell, the positive electrode plate is welded with the battery shell, and the controller shell is connected with the battery shell;

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

18. The cylindrical secondary battery according to claim 14, wherein the casing of the cell is an aluminum case, the aluminum case of the cell is a positive electrode of the cell, and the controller case is connected to the aluminum case;

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 inner electrode battery cell welding table of the battery controller.

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