CN117855628A

CN117855628A - 1.5V lithium battery and manufacturing method thereof

Info

Publication number: CN117855628A
Application number: CN202410218290.0A
Authority: CN
Inventors: 杨昌军; 肖朋飞; 赵建; 周伟; 侯强
Original assignee: Hamedata Technology Co ltd
Current assignee: Hamedata Technology Co ltd
Priority date: 2024-02-28
Filing date: 2024-02-28
Publication date: 2024-04-09

Abstract

The application relates to a 1.5V lithium battery and a manufacturing method thereof, wherein the lithium battery comprises a circuit component, a plastic middle frame, a winding electric core component, a metal shell and an insulating sheath, wherein the circuit component, the plastic middle frame and the winding electric core component are sequentially arranged in the metal shell from top to bottom; the upper part of the metal shell is internally provided with a rolling groove, the top part of the metal shell is internally provided with a spinning edge, the rolling groove limits the winding cell assembly at the bottom of the metal shell, the plastic middle frame is limited between the rolling groove and the spinning edge, the sealing between the plastic middle frame and the metal shell is realized, and the circuit assembly is arranged on the plastic middle frame. The winding battery cell component is directly placed in the metal shell, and compared with a soft-package lithium battery cell or a hard-shell lithium battery cell adopted in the prior art, the winding battery cell component is less in one-layer package shell, and is lower in cost. Through setting up the indent, realize the fixed to coiling electric core subassembly, the indent compresses tightly the sealing with the plastic center jointly with the spinning limit of upper end, can not leak electrolyte.

Description

1.5V lithium battery and manufacturing method thereof

Technical Field

The application relates to the technical field of lithium batteries, in particular to a 1.5V lithium battery and a manufacturing method thereof.

Background

In chinese patent application with publication number CN203787480U, entitled "a variable voltage cylindrical battery device", a low voltage lithium battery is disclosed, in which the high voltage (3.0-4.2V) of the lithium battery is converted into a low voltage of 1.5V by a voltage drop circuit board, thereby replacing the common No. 5 and No. 7 batteries. Chinese patent application publication No. CN204966611U, entitled "a constant voltage lithium ion battery of 1.5V", discloses a voltage step-down circuit capable of constantly outputting a low voltage of 1.5V. The prior art adopts a cylindrical battery core, generally can be a soft-package battery core or a hard-shell battery core, and is externally provided with a layer of metal shell, so that the assembly process is simple, but the cost is high.

Disclosure of Invention

The invention provides a 1.5V lithium battery and a manufacturing method thereof, aiming at solving the technical problem of high cost of the existing 1.5V lithium battery.

On one hand, the technical scheme provided by the application is as follows: the 1.5V lithium battery comprises a circuit component, a plastic middle frame, a winding electric core component, a metal shell and an insulating sheath, wherein the insulating sheath is coated outside the metal shell; the upper part of the metal shell is internally provided with a rolling groove, the top part of the metal shell is internally provided with a spinning edge, the rolling groove limits the winding cell assembly at the bottom of the metal shell, the plastic middle frame is limited between the rolling groove and the spinning edge, the sealing between the plastic middle frame and the metal shell is realized, and the circuit assembly is arranged on the plastic middle frame.

By adopting the technical scheme: the winding battery cell component is directly placed in the metal shell, and compared with a soft-package lithium battery cell or a hard-shell lithium battery cell adopted in the prior art, the winding battery cell component is less in one-layer package shell, and is lower in cost. Through setting up the indent, realize the fixed to coiling electric core subassembly, the indent compresses tightly the sealing with the plastic center jointly with the spinning limit of upper end, can not leak electrolyte.

Preferably, the plastic middle frame is tightly matched with the metal shell to realize sealing; or the lower end of the plastic middle frame is sleeved with a sealing ring, and the sealing ring is tightly pressed between the plastic middle frame and the rolling groove, so that the sealing between the plastic middle frame and the metal shell is realized.

Preferably, the winding cell assembly comprises a winding cell, a positive electrode tab, a negative electrode tab, an upper isolation sheet and a lower isolation sheet, wherein the positive electrode tab penetrates out of a central hole of the upper isolation sheet and is electrically connected to the circuit assembly, the negative electrode tab winds to the bottom surface from the side surface of the winding cell, and the end part of the negative electrode tab is welded to the bottom wall of the metal shell.

Preferably, the circuit assembly comprises a PCB (printed circuit board), a low-voltage positive electrode cap, a negative electrode elastic sheet and a high-voltage positive electrode cap, wherein the front surface of the PCB is provided with a low-voltage positive electrode copper ring and a negative electrode copper ring, the back surface of the PCB is provided with a high-voltage positive electrode copper ring, the low-voltage positive electrode cap is welded on the positive electrode copper ring through a patch, the negative electrode elastic sheet comprises a base ring and fins uniformly distributed on the periphery of the base ring, the back surface of the base ring is welded on the negative electrode copper ring through a patch, and the fins are elastically pressed with the spinning edge of the metal shell; the high-voltage positive electrode cap is welded on the high-voltage positive electrode copper ring through the patch and used as a high-voltage positive electrode input end, the high-voltage positive electrode cap is connected with the positive electrode lug through welding, the low-voltage positive electrode cap is used as a low-voltage output positive electrode of the lithium battery, and the metal shell is used as a public negative electrode.

Preferably, the inner wall of the plastic middle frame is provided with a flange edge for supporting the PCB, and pouring sealant is also arranged between the high-voltage positive electrode cap and the plastic middle frame to form a seal so as to isolate electrolyte; the electronic components on the PCB are intensively arranged in the low-voltage positive electrode cap and the high-voltage positive electrode cap; positive and negative pole spacer plates are also adhered above the spinning edges, and the upper surfaces of the positive and negative pole spacer plates are also wrapped by insulating sheaths.

Preferably, the circuit assembly comprises a PCB board, a low-voltage positive electrode cap, a charging interface, a negative electrode elastic sheet and a positive electrode switching sheet, wherein the low-voltage positive electrode cap is welded on the upper surface of the PCB board through a patch, the charging interface and the positive electrode switching sheet are arranged on the lower surface of the PCB board, a public negative electrode bonding pad is arranged on the upper surface of the PCB board, the negative electrode elastic sheet comprises a substrate and a plurality of fins arranged on the outer edge of the substrate, the back of the substrate is welded on the public negative electrode bonding pad through the patch, the fins are elastically pressed and connected with the spinning edge of the metal shell, the positive electrode lug of the winding battery core assembly is welded and fixed with the positive electrode switching sheet, the negative electrode lug is welded and fixed with the bottom end of the metal shell, the PCB board is clamped in a plastic middle frame, a charging indicator lamp is further arranged on the PCB board, a charging hole and a light transmitting hole are arranged at the same position of the insulating shell and the metal shell, and the plastic middle frame is made of transparent materials.

Preferably, a first through hole is formed in the middle of the bottom wall of the plastic middle frame, the positive electrode switching sheet downwards passes through the first through hole and is connected with the positive electrode lug through spot welding after being bent, and pouring sealant is arranged at the first through hole to form a seal so as to isolate electrolyte; positive and negative pole spacers are adhered above the spinning edges, the outer side parts of the positive and negative pole spacers are wrapped by insulating sheaths, and a PCB spacer is arranged between the PCB and the spinning edges so as to avoid short circuit between electronic elements or welding spots on the PCB and the spinning edges; the plastic middle frame is internally provided with a containing cavity of the PCB, the inner wall of the upper end of the plastic middle frame is provided with a plurality of first buckles in a dispersing way, and the first buckles limit the PCB in the containing cavity; the bottom wall of the plastic middle frame is also provided with a thin-wall pressure relief hole, and the thin-wall pressure relief hole is positioned below the charging interface.

Preferably, the circuit assembly comprises a PCB board, an anode contact spring, an anode rotating sheet, a cathode shrapnel and a low-voltage anode cap, wherein the plastic middle frame comprises a plastic upper shell and a plastic lower shell which are fastened with each other, the PCB board is vertically arranged between the plastic upper shell and the plastic lower shell, the anode contact spring is arranged at the upper end of the PCB board, the anode rotating sheet is arranged at the lower end of the PCB board, a charging interface and the cathode shrapnel are arranged at the middle part of the PCB board, the low-voltage anode cap is arranged on the plastic upper shell, the anode contact spring upwards passes through the plastic upper shell and is in elastic contact with the inner wall of the low-voltage anode cap, the cathode shrapnel is in elastic contact with the inner wall of the metal shell, the anode lug of the winding battery assembly is welded to the anode rotating sheet, an anode and a cathode separator is further arranged between the side and the low-voltage anode cap, a charging indicator lamp is further arranged on the PCB board, a charging hole and a light transmitting hole are arranged at the same position of the insulating sheath and the metal shell, and the plastic upper shell and the plastic lower shell are made of transparent materials.

Preferably, the side surface of the plastic upper shell is provided with a slot, the side wall of the slot is provided with a buckling hole, the plastic lower shell is provided with an inserting piece, the inner side of the inserting piece is provided with a second buckle, after the plastic upper shell and the plastic lower shell are in butt joint, the inserting piece is inserted into the slot, and the second buckle is embedded into the buckling hole; the side wall of the plastic upper shell is also provided with a first avoiding hole and a second avoiding hole which are respectively used for exposing the charging interface and the negative pole shrapnel.

On the other hand, another technical scheme provided by the application is as follows: a method of manufacturing the 1.5V lithium battery described above, comprising the steps of:

s1, placing a winding battery cell assembly into a metal shell, pressing the winding battery cell assembly on the bottom of the metal shell, and spot welding the bottom of the metal shell to enable a negative electrode lug to be welded on the metal shell;

s2, manufacturing a rolling groove on the upper part of the metal shell in a spinning mode; defining a coiled electrical core assembly within a metal housing;

s3, filling electrolyte into the winding cell assembly;

s4, placing the circuit component into the plastic middle frame;

s5, welding the positive electrode lug of the winding battery core assembly onto the circuit assembly;

s6, placing the circuit component and the plastic middle frame into the metal shell;

s7, manufacturing a spinning edge at the upper end of the metal shell in a spinning mode, and limiting the circuit component and the plastic middle frame in the metal shell;

s8, adhering positive and negative pole spacers above the spinning edges;

s9, wrapping an insulating sheath outside the metal shell.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the winding battery core component is directly placed in the metal shell, so that the cost is lower; the rolling groove and the spinning edge are arranged on the metal shell, so that the winding cell assembly and the plastic middle frame can be fixed, the compaction sealing is realized, and electrolyte cannot leak;

2. the PCB in the circuit assembly is also provided with necessary circuits such as a voltage reduction circuit, a voltage stabilizing circuit, a charging circuit, an over-discharge protection circuit and the like, the low-voltage positive electrode cap is used as a battery positive electrode, and the metal shell is used as a battery negative electrode, so that low voltage can be stably output;

3. the application has set up anodal block of low pressure and anodal block of high pressure, has set up anodal copper circle, negative pole copper circle and high pressure input copper circle on the PCB board, does not use any conductive cable, and electrical property's stability is higher.

Drawings

Fig. 1 is a perspective view of a 1.5V lithium battery according to an embodiment of the present application;

fig. 2 is a schematic diagram of a semi-sectional structure of a 1.5V lithium battery according to an embodiment of the present application;

FIG. 3 is an enlarged view at A in FIG. 2;

FIG. 4 is an enlarged view at B in FIG. 2;

fig. 5 is a front perspective view of a PCB board according to an embodiment of the present application;

fig. 6 is a rear perspective view of a PCB board according to an embodiment of the present application;

fig. 7 is a perspective view of a wound cell assembly according to an embodiment of the present application;

FIG. 8 is a schematic diagram illustrating an assembly operation of the circuit assembly according to the embodiment of the present application;

FIG. 9 is a schematic diagram illustrating an assembly operation of the circuit component and the plastic middle frame according to the embodiment of the present invention;

FIG. 10 is a front perspective view of a circuit assembly and a plastic center assembly according to one embodiment of the present disclosure;

FIG. 11 is a rear perspective view of a circuit assembly and a plastic center assembly according to one embodiment of the present disclosure;

FIG. 12 is a schematic diagram of a circuit assembly and a plastic center after dispensing according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram illustrating an assembly operation of the wound cell assembly into a metal housing according to an embodiment of the present disclosure;

fig. 14 is a schematic diagram illustrating an operation of welding the negative electrode tab to the metal shell according to the embodiment of the present application;

FIG. 15 is a schematic diagram illustrating an embodiment of the present application for forming a rolling groove on a metal shell;

FIG. 16 is a schematic diagram illustrating an operation of welding the positive tab to the low voltage positive cap according to an embodiment of the present disclosure;

FIG. 17 is a schematic diagram illustrating the placement of the circuit components and plastic middle frame into the metal housing according to the embodiment of the present application;

FIG. 18 is a schematic diagram illustrating an operation of forming a spinning edge on a metal shell according to an embodiment of the present disclosure;

FIG. 19 is a schematic diagram illustrating an operation of attaching positive and negative separator plates to a spinning edge according to an embodiment of the present application;

FIG. 20 is a schematic diagram illustrating an embodiment of the present invention for inserting a metal shell into an insulating sheath;

FIG. 21 is a schematic view of a metal shell according to an embodiment of the present application after being placed in an insulating sheath;

FIG. 22 is a schematic view showing a state of wrapping the metal shell with the insulating sheath according to the embodiment of the present application;

fig. 23 is a perspective view of a 1.5V lithium battery according to embodiment two of the present application;

fig. 24 is a schematic view showing a semi-sectional structure of a 1.5V lithium battery according to a second embodiment of the present application;

FIG. 25 is an enlarged view of FIG. 24 at C;

fig. 26 is a schematic diagram showing an exploded structure of a 1.5V lithium battery according to a second embodiment of the present application;

FIG. 27 is a rear perspective view of a PCB and plastic center assembly according to a second embodiment of the present disclosure;

fig. 28 is a front perspective view of an exploded structure of a PCB board and a plastic middle frame according to a second embodiment of the present application;

fig. 29 is a rear perspective view of an exploded structure of a PCB board and a plastic middle frame according to a second embodiment of the present application;

fig. 30 is an exploded view of a PCB board according to a second embodiment of the present disclosure;

fig. 31 is a perspective view of a 1.5V lithium battery according to embodiment three of the present application;

fig. 32 is a schematic diagram of a semi-sectional structure of a 1.5V lithium battery according to a third embodiment of the present application;

FIG. 33 is an enlarged view of D in FIG. 32;

FIG. 34 is a schematic view of a semi-sectional structure of a 1.5V lithium battery according to another embodiment of the present disclosure;

FIG. 35 is an enlarged view at E in FIG. 34;

fig. 36 is a schematic view showing an exploded structure of a 1.5V lithium battery according to a third embodiment of the present application;

fig. 37 is an exploded view of a PCB and a plastic middle frame according to a third embodiment of the present application.

Reference numerals illustrate: 1. a circuit assembly; 11. a PCB board; 111. a low voltage positive copper ring; 112. a negative copper ring; 113. a high voltage positive copper ring; 114. an electronic component; 115. a common negative electrode pad; 12. a low voltage positive cap; 13. a negative pole shrapnel; 131. a base ring; 132. a fin; 133. a substrate; 14. a high voltage positive electrode cap; 15. a charging interface; 16. a positive electrode switching piece; 17. a charge indicator light; 18. a positive electrode contact spring; 2. a plastic middle frame; 21. a flange edge; 22. a first through hole; 23. a receiving chamber; 24. a first buckle; 25. a thin wall pressure relief hole; 26. a plastic upper shell; 261. a slot; 262. a button hole; 263. a first avoidance hole; 264. a second avoidance hole; 27. a plastic lower shell; 271. inserting sheets; 272. a second buckle; 273. a second through hole; 3. winding the cell assembly; 31. winding the battery cell; 32. a positive electrode tab; 33. a negative electrode tab; 34. a spacer is arranged; 35. a lower spacer; 4. a metal housing; 41. rolling grooves; 42. spinning edges; 43. a charging hole; 44. a light hole; 5. an insulating sheath; 51. a charging hole; 52. a light hole; 6. a seal ring; 7. pouring sealant; 8. positive and negative pole spacer; 9. PCB board spacer.

Detailed Description

The present application is described in further detail below in conjunction with fig. 1-37.

Example 1

Referring to fig. 1 to 22, the embodiment of the application discloses a 1.5V lithium battery, which comprises a circuit component 1, a plastic middle frame 2, a winding electric core component 3, a metal shell 4 and an insulating sheath 5, wherein the insulating sheath 5 is coated outside the metal shell 4, and the circuit component 1, the plastic middle frame 2 and the winding electric core component 3 are sequentially arranged in the metal shell 4 from top to bottom; the upper part of the metal shell 4 is internally provided with a rolling groove 41, the top part of the metal shell is internally provided with a spinning edge 42, the rolling groove 41 limits the winding cell assembly 3 at the bottom of the metal shell 4, the plastic middle frame 2 is limited between the rolling groove 41 and the spinning edge 42, the sealing between the plastic middle frame and the metal shell 4 is realized, and the circuit assembly 1 is arranged on the plastic middle frame 2. In this embodiment, the plastic middle frame 2 and the metal shell 4 are tightly matched to realize sealing.

Referring to fig. 3, 4 and 7, the wound cell assembly 3 includes a wound cell 31, a positive tab 32, a negative tab 33, an upper spacer 34 and a lower spacer 35, the positive tab 32 is penetrated from a central hole of the upper spacer 34 and electrically connected to the circuit assembly 1, the negative tab 33 is wound from a side surface to a bottom surface of the wound cell 31, and an end portion is welded to a bottom wall of the metal case 4. The winding cell assembly 3 can be a ternary winding cell assembly or a ferric phosphate winding cell assembly which is common in the market, and can be other types of winding cell assemblies, wherein the voltage range is 3.0-4.2V, and the constant voltage is output by 1.5V after the voltage drop of the PCB 11. Since various functional circuits on the PCB 11 are already prior art, the present application does not substantially improve this, and will not be described here too much. The insulating sheath 5 is preferably made of PVC material and has the characteristic of thermal shrinkage, and the metal shell 4 can be tightly wrapped by blowing hot air.

Referring to fig. 5, 6 and 8, the circuit assembly 1 includes a PCB 11, a low-voltage positive electrode cap 12, a negative electrode spring 13 and a high-voltage positive electrode cap 14, the front surface of the PCB 11 is provided with a low-voltage positive electrode copper ring 111 and a negative electrode copper ring 112, the back surface is provided with a high-voltage positive electrode copper ring 113, the low-voltage positive electrode cap 12 is welded on the positive electrode copper ring through a patch, the negative electrode spring 13 includes a base ring 131 and fins 132 uniformly distributed on the periphery of the base ring 131, the back surface of the base ring 131 is welded on the negative electrode copper ring 112 through a patch, and the fins 132 are elastically crimped with the spinning edge 42 of the metal shell 4; the high-voltage positive electrode cap 14 is welded on the high-voltage positive electrode copper ring 113 through a patch and is used as a high-voltage positive electrode input end, the high-voltage positive electrode cap 14 is connected with the positive electrode lug 32 through welding, the low-voltage positive electrode cap 12 is used as a low-voltage output positive electrode of a lithium battery, and the metal shell 4 is used as a public negative electrode.

The PCB board 11 in the circuit assembly 1 is also provided with necessary circuits such as a voltage reducing circuit, a voltage stabilizing circuit, a charging circuit, an over-discharge protection circuit and the like, and the PCB board 11 is characterized in that the front side is provided with a low-voltage positive copper ring 111 and a negative copper ring 112, the back side is provided with a high-voltage positive copper ring 113, the low-voltage positive copper ring 111 is used as a low-voltage output positive, the high-voltage positive copper ring 113 is used as a high-voltage input positive, the negative copper ring 112 is used as a public negative, the three copper rings are electrically connected with an external conductive part, so that the functions of high-voltage input and low-voltage output are realized, the low voltage of 1.5V can be stably output, the same-port charging and discharging functions are realized, no conductive cable is required to be arranged, the stability of the electrical performance is higher, the internal connection structure of a lithium battery is simplified, the problem is not easy, and the circuit assembly is safer.

The fin 132 is elastically pressed against the spinning edge 42 of the metal housing 4, so that the metal housing 4 and the negative copper ring 112 on the PCB 11 can be prevented from being not tightly pressed against each other or the negative copper ring 112 can be prevented from being damaged by pressing.

Referring to fig. 3, the inner wall of the plastic middle frame 2 is provided with a flange edge 21 for supporting the PCB 11, and a pouring sealant 7 is further provided between the high-voltage positive electrode cap 14 and the plastic middle frame 2 to form a seal for isolating the electrolyte; the electronic components 114 on the PCB board 11 are intensively arranged in the low-voltage positive electrode cap 12 and the high-voltage positive electrode cap 14; positive and negative pole spacer 8 is still pasted to spinning limit 42 top, positive and negative pole spacer 8 part upper surface still is wrapped up by insulating sheath 5.

The pouring sealant 7 can fill the gap between the high-voltage positive electrode cap 14 and the plastic middle frame 2, has a good sealing effect, and is used for isolating electrolyte and preventing the electrolyte from contacting the PCB 11 to cause corrosion, so that the PCB 11 fails prematurely. Through thickness and cross-sectional shape of control pouring sealant 7, can make pouring sealant 7 have specific intensity, when the inside trouble that appears in coiling electric core assembly 3, the temperature risees, and atmospheric pressure increases, reaches the certain threshold value, can break pouring sealant 7 and carry out the pressure release, avoids lithium cell excessive pressure explosion.

The low-voltage positive electrode cap 12 and the high-voltage positive electrode cap 14 are welded on the PCB 11 through the patches, and firstly, the connection strength is good, the fixation is reliable, and secondly, the sectional area of the connection part is large, the resistance is small, and the conductivity is good. The electronic components 114 on the PCB 11 are preferably arranged in the low-voltage positive electrode cap 12 and the high-voltage positive electrode cap 14 in a concentrated manner, firstly, the electronic components 114 are reasonably arranged, and the internal space of the low-voltage positive electrode cap 12 and the high-voltage positive electrode cap 14 is fully utilized; secondly, the low-voltage positive electrode cap 12 and the high-voltage positive electrode cap 14 have good strength, can play a role in protection, and the electronic element 114 cannot be contacted with the outside and cannot be damaged; thirdly, play sealed effect, prevent to advance water and advance the dust, improve the life of PCB board 11. The electronic element 114 in the high-voltage positive electrode cap 14 is a three-in-one voltage reduction chip, belongs to the prior art, has the advantages of high integration level and small volume, and is easier to design the PCB 11; the electronic component 114 in the low-voltage positive electrode cap 12 is an inductor, a capacitor, a resistor, or the like. In addition, since the low-voltage positive electrode cap 12 is exposed, needs to be in contact with the outside, is easily impacted, and needs to be in a higher-strength fixing connection mode, for this purpose, particularly, the flange 21 is provided on the low-voltage positive electrode cap 12, and the flange 21 has a certain width which is several times the wall thickness of the low-voltage positive electrode cap 12, so that the contact area with the low-voltage positive electrode copper ring 111 is large, and the fixing is firm and impact-resistant. Since the high-voltage positive electrode cap 14 is not exposed, is not subjected to external impact, and has a low strength requirement, the flange 21 may not be provided.

The positive and negative pole spacer 8 can prevent sundries such as dust from entering between the negative pole shrapnel 13 and the low-voltage positive pole cap 12, so as to avoid short circuit between the negative pole shrapnel and the low-voltage positive pole cap, and part of the upper surface of the positive and negative pole spacer 8 is further wrapped by the insulating sheath 5, so that the positive and negative pole spacer 8 is further fixed.

The specific connection principle of the circuit is as follows: the positive electrode lug 32 of the winding cell assembly 3 is connected to the PCB 11 through the high-voltage positive electrode cap 14 and the high-voltage positive electrode copper ring 113, the negative electrode lug 33 of the winding cell assembly 3 is connected to the PCB 11 through the metal shell 4, the negative electrode spring plate 13 and the negative electrode copper ring 112, after the circuit voltage reduction treatment on the PCB 11, the positive electrode of the lithium battery is output from the low-voltage positive electrode copper ring 111 and the low-voltage positive electrode cap 12, and the negative electrode of the lithium battery is output from the negative electrode copper ring 112, the negative electrode spring plate 13 and the metal shell 4.

The winding battery cell component 3 is directly placed into the metal shell 4, and compared with a soft-package lithium battery cell or a hard-shell lithium battery cell adopted in the prior art, the winding battery cell component has the advantages that the winding battery cell component is wrapped by one layer, and the cost is lower. Through setting up the indent 41, realize the fixed to coiling electric core subassembly 3, the indent 41 compresses tightly sealed with the spinning limit 42 of upper end jointly with plastic center 2, can not leak electrolyte, realizes the packing seal of integration.

The manufacturing method of the 1.5V lithium battery in the embodiment comprises the following steps:

referring to fig. 8, a PCB 11 is provided, a low-voltage positive cap 12 and a negative spring 13 are soldered on the front surface of the PCB 11, and a high-voltage positive cap 14 is soldered on the back surface of the PCB 11 to form a circuit assembly 1;

s1, referring to FIGS. 13 and 14, placing a winding cell assembly 3 into a metal shell 4, pressing the winding cell assembly 3 on the bottom of the metal shell 4, and spot-welding the bottom of the metal shell 4 to weld a negative electrode tab 33 on the metal shell 4;

s2, referring to FIG. 15, a rolling groove 41 is formed on the upper part of the metal shell 4 by a spinning method; defining a wound cell assembly 3 within a metal housing 4;

s3, filling electrolyte into the winding cell assembly 3;

s4, placing the circuit component 1 into the plastic middle frame 2; pouring sealant 7 is dispensed on the back surface of the plastic middle frame 2, so that a sealing structure is formed between the plastic middle frame 2 and the high-voltage positive electrode cap 14;

s5, referring to FIG. 16, welding the positive electrode tab 32 of the winding cell assembly 3 to the lower surface of the high-voltage positive electrode cap 14 of the circuit assembly 1;

s6, referring to FIG. 17, the circuit component 1 and the plastic middle frame 2 are placed in the metal shell 4;

s7, referring to FIG. 18, a spinning edge 42 is manufactured at the upper end of the metal shell 4 by a spinning mode, and the circuit assembly 1 and the plastic middle frame 2 are limited inside the metal shell 4;

s8, referring to FIG. 19, adhering the positive and negative pole spacers 8 above the spinning edge 42;

s9, referring to fig. 20 to 22, an insulating sheath 5 is wrapped around the metal shell 4.

The manufacturing method has reasonable working procedures and high yield, and can realize industrialization and mass production.

Example two

The first difference from the embodiment is mainly that a charging interface 15 is added, charging is directly performed through the charging interface 15, and the charging interface 15 can be a common interface such as miniUSB or TYPE-C in the prior art.

Referring to fig. 23 to 30, the circuit assembly 1 includes a PCB 11, a low-voltage positive electrode cap 12, a charging interface 15, a negative electrode spring plate 13 and a positive electrode switching piece 16, the low-voltage positive electrode cap 12 is welded on the upper surface of the PCB 11 through a patch, the charging interface 15 and the positive electrode switching piece 16 are disposed on the lower surface of the PCB 11, a common negative electrode pad 115 is disposed on the upper surface of the PCB 11, the negative electrode spring plate 13 includes a substrate 133 and a plurality of fins 132 disposed on the outer edge of the substrate 133, the back surface of the substrate 133 is welded on the common negative electrode pad 115 through the patch, the fins 132 are elastically crimped with a spinning edge 42 of the metal housing 4, the positive electrode tab 32 of the winding core assembly 3 is welded and fixed with the positive electrode switching piece 16, the negative electrode tab 33 is welded and fixed with the bottom end of the metal housing 4, the PCB 11 is clamped in the plastic middle frame 2, a charging indicator lamp 17 is further disposed on the PCB 11, and charging holes 51, 43 and 52, 44 are disposed at the same position of the insulating skin 5 and the metal housing 4 during charging, and the plastic frame 2 are made of transparent material.

The fin 132 is elastically abutted against the spinning edge 42 of the metal shell 4, so that the situation that the metal shell 4 is not tightly pressed against the negative pole shrapnel 13 or the PCB 11 is damaged can be avoided.

Referring to fig. 25, a first through hole 22 is formed in the middle of the bottom wall of the plastic middle frame 2, the positive electrode rotating tab 16 passes through the first through hole 22 downwards, is connected with the positive electrode tab 32 through spot welding after being bent, and a pouring sealant 7 is arranged at the first through hole 22 to form a seal so as to isolate electrolyte; positive and negative pole spacer plates 8 are adhered above the spinning edge 42, the outer side parts of the positive and negative pole spacer plates 8 are wrapped by insulating outer skins 5, and a PCB spacer plate 9 is arranged between the PCB 11 and the spinning edge 42 so as to prevent electronic elements 114 or welding spots on the PCB 11 from being short-circuited with the spinning edge 42; the plastic middle frame 2 is internally provided with a containing cavity 23 of the PCB 11, the inner wall of the upper end of the plastic middle frame is provided with a plurality of first buckles 24 in a dispersing way, the first buckles 24 limit the PCB 11 in the containing cavity 23, and the PCB 11 is directly pressed into the containing cavity 23 due to certain elastic deformation capacity of the first buckles 24, the first buckles 24 can prevent the PCB 11 from being pulled out outwards, and the plastic middle frame 2 also has the effect of isolating the PCB 11 from the metal shell 4; the bottom wall of the plastic middle frame 2 is also provided with a thin-wall pressure relief hole 25, the thin-wall pressure relief hole 25 is positioned below the charging interface 15, once the inside of the winding battery core assembly 3 fails, the thin wall can be broken to relieve pressure when the temperature rises and the air pressure increases suddenly, the risk of explosion of the lithium battery is reduced, the distance between the thin-wall pressure relief hole 25 and the charging holes 51 and 43 is very short, and the pressure relief path is short.

Referring to fig. 30, the low-voltage positive electrode cap 12 is welded on the PCB board 11 through a patch, both fixing and electrical connection are reliable, a part of the electronic components 114 on the PCB board 11 are placed in the low-voltage positive electrode cap 12, the internal space of the low-voltage positive electrode cap 12 is fully utilized, the low-voltage positive electrode cap 12 protects the electronic components 114 inside, and the sealing effect is good, so that the dust is prevented from entering the water.

In this embodiment, the PCB 11 is clamped in the plastic middle frame 2, the PCB 11 cannot easily separate from the plastic middle frame 2, which plays a role in fixing, and can protect the PCB 11, prevent the PCB 11 from being pressed during processing the spinning edge 42, and can be isolated from the metal casing 4 without short circuit.

Other structures and beneficial effects are the same as those of the embodiments, and are not described herein.

Example III

The difference from the second embodiment is that the circuit assembly 1 is greatly changed, in particular, the arrangement of the charging interface 15.

Referring to fig. 31 to 37, the circuit assembly 1 includes a PCB 11, a positive contact spring 18, a positive rotating tab 16, a negative spring 13 and a low voltage positive cap 12, the plastic middle frame 2 includes a plastic upper case 26 and a plastic lower case 27 fastened to each other, the PCB 11 is vertically disposed between the plastic upper case 26 and the plastic lower case 27, and the plastic middle frame 2 has an effect of isolating the PCB 11 from the metal case 4; the positive electrode contact spring 18 is arranged at the upper end of the PCB 11, the positive electrode rotating sheet 16 is arranged at the lower end of the PCB 11, the charging interface 15 and the negative electrode elastic sheet 13 are arranged at the middle part of the PCB 11, the low-voltage positive electrode cap 12 is arranged on the plastic upper shell 26, the positive electrode contact spring 18 upwards penetrates through the plastic upper shell 26 to be in elastic contact with the inner wall of the low-voltage positive electrode cap 12, the negative electrode elastic sheet 13 is in elastic contact with the inner wall of the metal shell 4, the positive electrode lug 32 of the winding battery cell assembly 3 is welded on the positive electrode rotating sheet 16, the positive electrode isolating sheet 8 is arranged between the spinning edge 42 and the low-voltage positive electrode cap 12, short circuit between the metal shell 4 and the low-voltage positive electrode cap 12 is mainly prevented, the charging indicator lamp 17 is further arranged on the PCB 11, the same position of the insulating shell 5 and the metal shell 4 is provided with charging holes 51, 43 and light holes 52 and 44, and the plastic lower shell 27 are made of transparent materials.

Referring to fig. 37, a slot 261 is provided on the side of the plastic upper shell 26, a fastening hole 262 is provided on the side wall of the slot 261, an inserting piece 271 is provided on the plastic lower shell 27, a second fastening piece 272 is provided on the inner side of the inserting piece 271, the inserting piece 271 is inserted into the slot 261 after the plastic upper shell 26 and the plastic lower shell 27 are abutted, and the second fastening piece 272 is inserted into the fastening hole 262, so that the plastic upper shell 26 and the plastic lower shell 27 are fastened and fixed together; the side wall of the plastic upper shell 26 is further provided with a first avoiding hole 263 and a second avoiding hole 264, which are respectively used for exposing the charging interface 15 and the negative pole shrapnel 13.

Referring to fig. 35, a sealing ring 6 is sleeved at the lower end of the plastic middle frame 2, and the sealing ring 6 is pressed between the plastic middle frame 2 and the rolling groove 41, so that the sealing between the plastic middle frame 2 and the metal shell 4 is realized. In the process of forming the spinning edge 42, the plastic middle frame 2 is extruded downwards, and the sealing ring 6 is extruded and deformed, so that a high sealing degree can be achieved, and the electrolyte is effectively prevented from leaking.

Referring to fig. 35, a second through hole 273 is formed in the middle of the bottom wall of the plastic lower case 27, the positive electrode switching piece 16 passes through the second through hole 273, is connected with the positive electrode tab 32 through spot welding after being bent, and the second through hole 273 is provided with a pouring sealant 7 to form a seal so as to isolate electrolyte, avoid the electrolyte from penetrating into the PCB board 11 from the second through hole 273, and simultaneously control the thickness of the pouring sealant 7, so that the plastic lower case can be used as a pressure release hole.

The plastic middle frame 2 that this embodiment set up can set up PCB board 11 in plastic middle frame 2 vertically, and the interface 15 that charges on the PCB board 11 also is vertical arranging, and the interface 15 that charges like this can easily put into metal casing 4, and especially lithium cell appearance is No. 7 battery size and is than less, and plastic middle frame 2 can protect PCB board 11, prevents to oppress PCB board 11 when processing spinning limit 42, can keep apart with metal casing 4 again, can not the short circuit.

Other structures and beneficial effects are consistent with those of the second embodiment, and will not be described here again.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. The 1.5V lithium battery is characterized by comprising a circuit component, a plastic middle frame, a winding battery core component, a metal shell and an insulating sheath, wherein the insulating sheath is coated outside the metal shell; the upper part of the metal shell is internally provided with a rolling groove, the top part of the metal shell is internally provided with a spinning edge, the rolling groove limits the winding cell assembly at the bottom of the metal shell, the plastic middle frame is limited between the rolling groove and the spinning edge, the sealing between the plastic middle frame and the metal shell is realized, and the circuit assembly is arranged on the plastic middle frame.

2. The 1.5V lithium battery of claim 1, wherein the plastic center is sealed to the metal housing by a tight fit.

3. The 1.5V lithium battery of claim 1, wherein the plastic middle frame is provided with a sealing ring at its lower end, the sealing ring being compressed between the plastic middle frame and the rolling groove, thereby sealing between the plastic middle frame and the metal casing.

4. The 1.5V lithium battery of claim 1, wherein the wound cell assembly comprises a wound cell, a positive tab, a negative tab, an upper spacer and a lower spacer, the positive tab extending from a central hole of the upper spacer, electrically connected to the circuit assembly, the negative tab winding from a side to a bottom of the wound cell, and the end welded to a bottom wall of the metal can.

5. The 1.5V lithium battery of claim 4, wherein the circuit assembly comprises a PCB board, a low-voltage positive electrode cap, a negative electrode spring piece and a high-voltage positive electrode cap, wherein the front surface of the PCB board is provided with a low-voltage positive electrode copper ring and a negative electrode copper ring, the back surface of the PCB board is provided with a high-voltage positive electrode copper ring, the low-voltage positive electrode cap is welded on the positive electrode copper ring through a patch, the lower surface of the negative electrode spring piece is welded on the negative electrode copper ring, and the upper surface of the negative electrode spring piece is in pressure connection with the spinning edge of the metal shell; the high-voltage positive electrode cap is welded on the high-voltage positive electrode copper ring through the patch and used as a high-voltage positive electrode input end, the high-voltage positive electrode cap is connected with the positive electrode lug through welding, the low-voltage positive electrode cap is used as a low-voltage output positive electrode of the lithium battery, and the metal shell is used as a public negative electrode.

6. The 1.5V lithium battery of claim 4, wherein the circuit component comprises a PCB, a low-voltage positive electrode cap, a charging interface, a negative electrode spring plate and a positive electrode transfer plate, the low-voltage positive electrode cap is welded on the upper surface of the PCB through a patch, the charging interface and the positive electrode transfer plate are arranged on the lower surface of the PCB, a public negative electrode bonding pad is arranged on the upper surface of the PCB, the negative electrode spring plate comprises a substrate and a plurality of fins arranged on the outer edge of the substrate, the back of the substrate is welded on the public negative electrode bonding pad through the patch, the fins are elastically pressed and connected with the spinning edge of a metal shell, the positive electrode tab of the winding battery component is welded and fixed with the positive electrode transfer plate, the negative electrode tab is welded and fixed with the bottom end of the metal shell, the PCB is clamped in a plastic middle frame, a charging indicator is further arranged on the PCB, a charging hole and a light transmitting hole are arranged at the same position of the insulating skin and the metal shell, and the plastic middle frame is made of transparent materials.

7. The 1.5V lithium battery of claim 4, wherein the circuit assembly comprises a PCB board, an anode contact spring, an anode rotating tab, a cathode spring and a low-voltage anode cap, the plastic middle frame comprises a plastic upper shell and a plastic lower shell which are fastened with each other, the PCB board is vertically arranged between the plastic upper shell and the plastic lower shell, the anode contact spring is arranged at the upper end of the PCB board, the anode rotating tab is arranged at the lower end of the PCB board, the charging interface and the cathode spring are arranged in the middle of the PCB board, the low-voltage anode cap is arranged on the plastic upper shell, the anode contact spring upwards passes through the plastic upper shell and is in elastic contact with the inner wall of the low-voltage anode cap, the cathode spring is in elastic contact with the inner wall of the metal shell, the anode tab of the winding cell assembly is welded onto the anode rotating tab, a positive-negative electrode isolating piece is further arranged between the spinning edge and the low-voltage anode cap, a charging indicator is further arranged on the PCB board, a charging hole and a hole are arranged at the same position of the insulating shell and the metal shell, and the plastic lower shell is made of transparent material.

8. A method of manufacturing the 1.5V lithium battery according to any one of claims 1 to 7, comprising the steps of:

s3, filling electrolyte into the winding cell assembly;

s4, placing the circuit component into the plastic middle frame;

s8, adhering positive and negative pole spacers above the spinning edges;

s9, wrapping an insulating sheath outside the metal shell.