CN220290879U

CN220290879U - Lithium battery mounting structure

Info

Publication number: CN220290879U
Application number: CN202321738113.2U
Authority: CN
Inventors: 高冲; 程辉; 吴德
Original assignee: Gotion High Tech Co Ltd
Current assignee: Gotion High Tech Co Ltd
Priority date: 2023-07-03
Filing date: 2023-07-03
Publication date: 2024-01-02
Anticipated expiration: 2033-07-03

Abstract

The utility model discloses a lithium battery mounting structure, which comprises winding cores, connecting pieces, protective adhesive tapes, cover plates and switching pieces, wherein a plurality of winding cores are overlapped to form a winding core group, one side of each tab end of each winding core is connected with each connecting piece, the protective adhesive tapes are arranged on the other side of each tab end, the tab of each winding core is folded to enable the protective adhesive tapes to be attached to the end surfaces of the winding cores, and the tab ends of the cover plates are connected with the connecting pieces through the switching pieces; the connecting piece is provided with a positioning hole, the connecting piece is provided with a boss, and the lug of the winding core is folded to enable the boss on the connecting piece to be clamped in the positioning hole. The utility model has the advantages that the structure can reduce the fracture risk of the tab caused by vibration, improve the welding strength, and the tab and the connecting sheet of the winding core are welded firstly and then folded, thereby preventing the phenomenon of winding core short circuit caused by diaphragm shrinkage on the winding core when the original tab and the connecting sheet are folded firstly and then welded, and improving the production qualification rate of the lithium battery.

Description

Lithium battery mounting structure

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a lithium battery mounting structure.

Background

At present, in the lithium battery production process, to the core of rolling up of both ends play utmost point ear, traditional scheme turns over the utmost point ear to on the change piece to through laser direct welding, owing to the utmost point ear comprises multilayer foil, when the battery has vibrations in the use, extremely easily lead to the cracked risk of utmost point ear, lead to the welding strength of utmost point ear and change piece not high, the welding heat leads to the diaphragm shrink to cause the core short circuit simultaneously, makes the manufacturing qualification rate of this process be difficult to promote.

Disclosure of Invention

The utility model aims to solve the technical problems of improving the welding strength of the tab and the switching piece and preventing the winding core from being short-circuited.

In order to solve the technical problems, the utility model provides the following technical scheme:

the lithium battery mounting structure comprises a winding core, a connecting sheet, a protective adhesive tape, a cover plate and a switching sheet, wherein a plurality of winding cores are overlapped to form a winding core group, one side of a lug end of each winding core is connected with the connecting sheet, the other side of the lug end of each winding core is provided with the protective adhesive tape, the lug of the winding core is folded to enable the protective adhesive tape to be attached to the end surface of the winding core, and a pole post end of the cover plate is connected with the connecting sheet through the switching sheet;

the connecting piece is provided with a positioning hole, the connecting piece is provided with a boss, and the lug of the winding core is folded to enable the boss on the connecting piece to be clamped in the positioning hole.

The lug end one side of every roll core is connected the connection piece, then paste the protection sticky tape at lug end opposite side, then fold the lug for the locating hole on the connection piece and the boss joint on the change piece, again with boss and connection piece welding, realize the change piece and roll up the connection of core, and then realize the connection of core and apron, in this structure be earlier with the lug welding on the connection piece, again with the connection piece welding on the change piece, the connection piece is bigger than the rigidity of lug, can reduce the lug and lead to the fracture risk because of vibrations, improve welding strength, and the lug and the connection piece of roll up the core are the book again of welding earlier, the diaphragm shrink on the roll up the core when having prevented to turn up earlier the welding again causes a roll core short circuit phenomenon, the production qualification rate of lithium cell has been improved.

Preferably, the winding core comprises a winding core body, a positive electrode lug and a negative electrode lug, wherein the positive electrode lug and the negative electrode lug are respectively arranged at two ends of the winding core body, and the positive electrode lug and the negative electrode lug are both connected with the connecting sheet.

Preferably, the cover plate comprises a substrate, a positive pole and a negative pole, wherein the positive pole and the negative pole are respectively arranged at two ends of the substrate, and the positive pole and the negative pole are connected with the connecting sheet through the connecting sheet.

Preferably, the base plate is also provided with a liquid injection hole and an explosion-proof valve.

Preferably, a chamfer is arranged at the edge of the positioning hole; the welding penetration is convenient to increase, and the phenomenon of cold joint is prevented.

Preferably, a protective sheet is further arranged between the protective adhesive tape and the connecting sheet.

Preferably, the outside of the winding core group is further wrapped with an insulating film.

Preferably, the winding core group is externally wrapped with a shell.

Compared with the prior art, the utility model has the beneficial effects that:

1. the lug end one side of every roll core is connected the connection piece, then paste the protection sticky tape at lug end opposite side, then fold the lug for the locating hole on the connection piece and the boss joint on the change piece, again with boss and connection piece welding, realize the change piece and roll up the connection of core, and then realize the connection of core and apron, in this structure be earlier with the lug welding on the connection piece, again with the connection piece welding on the change piece, the connection piece is bigger than the rigidity of lug, can reduce the lug and lead to the fracture risk because of vibrations, improve welding strength, and the lug and the connection piece of roll up the core are the book again of welding earlier, the diaphragm shrink on the roll up the core when having prevented to turn up earlier the welding again causes a roll core short circuit phenomenon, the production qualification rate of lithium cell has been improved.

2. Through being equipped with the chamfer in the edge of locating hole, be convenient for increase welding penetration, prevent to appear the rosin joint phenomenon.

Drawings

FIG. 1 is a schematic diagram of a structure of an embodiment of the present utility model before welding;

FIG. 2 is a schematic diagram of a welded structure according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a winding core according to an embodiment of the present utility model;

FIG. 4 is a schematic view illustrating the installation of a connecting piece according to an embodiment of the present utility model;

FIG. 5 is a schematic view showing the installation of an insulating film according to an embodiment of the present utility model;

fig. 6 is a schematic view illustrating the installation of a housing according to an embodiment of the present utility model.

Detailed Description

In order to facilitate the understanding of the technical scheme of the present utility model by those skilled in the art, the technical scheme of the present utility model will be further described with reference to the accompanying drawings.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated unless otherwise explicitly specified and defined. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 4, the embodiment discloses a lithium battery mounting structure, including a roll core 1, a connecting piece 2, a protection adhesive tape 3, a cover plate 4 and a switching piece 5, a plurality of roll cores 1 coincide and form a roll core group, and the utmost point ear end one side welding of every roll core 1 connecting piece 2, the opposite side is glued and is had protection adhesive tape 3, turns over a roll core 1 utmost point ear and causes protection adhesive tape 3 laminating at a roll core terminal surface and a connection piece 2 keep away from a roll core terminal surface, the utmost point post end of cover plate 4 passes through switching piece 5 and connects connection piece 2.

The connecting piece 2 is provided with a positioning hole 21, the switching piece 5 is provided with a boss 51, and the lug of the winding core 1 is folded so that the boss 51 on the switching piece 5 is clamped in the positioning hole 21.

Specifically, the connection piece 2 is welded on one side of the lug end of each winding core 1, then the protective adhesive tape 3 is stuck on the other side of the lug end, then the lug is folded, the positioning hole 21 on the connection piece 2 is clamped with the boss 51 on the switching piece 5, then the boss 51 is welded with the connection piece 2, the connection of the switching piece 5 and the winding cores 1 is realized, and then the connection of the winding cores 1 and the cover plate 4 is realized.

The winding core 1 comprises a winding core body 11, an anode lug 12 and a cathode lug 13, wherein the anode lug 12 and the cathode lug 13 are respectively arranged at two ends of the winding core body 11, and the anode lug 12 and the cathode lug 13 are both connected with the connecting sheet 2.

The cover plate 4 comprises a base plate 41, a positive pole 42 and a negative pole 43, the positive pole 42 and the negative pole 43 are respectively arranged at two ends of the base plate 41, and the positive pole 42 and the negative pole 43 are connected with the connecting sheet 2 through the switching sheet 3.

Further, the base plate 41 is further provided with a liquid injection hole 411 and an explosion-proof valve 412.

The edges of the positioning holes 21 are provided with chamfers, so that welding penetration is increased conveniently, and the phenomenon of cold joint is prevented.

A protective sheet 6 is welded between the protective adhesive tape 3 and the connecting sheet 2.

Referring to fig. 5 and 6, the outside of the winding core assembly is further wrapped with an insulating film 7 after the winding core assembly is welded, and the outside of the insulating film 7 is wrapped with a shell 8, and in this embodiment, the shell 8 is an aluminum shell. By the arrangement of the insulating film 7, the winding core 1 is prevented from being scratched when the subsequent winding core is assembled into the shell.

In addition, it should be noted that: the traditional scheme adopts a welding mode that the lugs are folded onto the adapter piece 5, is suitable for batteries with single winding cores and double winding cores, and has the same length at the moment, and the stress state and the bending state of each lug are basically the same; if a multi-coil core (more than 3 groups of battery cells) battery is adopted, the traditional mode is not applicable any more, in order to be welded on the switching piece at the same time, the lugs of each battery need to be set to be different lengths, the manufacturing complexity and difficulty are improved, and the stress state and the bending state of the lugs of each battery are different, so that the manufacturing consistency of the battery is poor. In this embodiment, the four winding cores 1 are also suitable for assembling any number of winding cores, and only the number of the end branches of the corresponding switching piece 5 needs to be changed, so that the manufacturing consistency of the lithium battery is improved.

The installation process of the embodiment is as follows:

welding the connecting sheet 2 on one side of the positive electrode lug 11 and the negative electrode lug 12 of each winding core 1 and welding the protective sheet 6 on the other side, pasting the protective tape 3 on one side of the positive electrode lug 11 and the negative electrode lug 12 close to the protective screen, folding the electrode lugs, enabling the positioning hole 21 on the connecting sheet 2 to be clamped with the boss 51 on the adapter sheet 5, welding the boss 51 with the connecting sheet 2, wrapping the insulating film 7 outside the winding core group after welding, wrapping the shell 8 outside the insulating film 7, and realizing the installation of the lithium battery.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

The above-described embodiments merely represent embodiments of the utility model, the scope of the utility model is not limited to the above-described embodiments, and it is obvious to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims

1. A lithium battery mounting structure, characterized in that: the protective adhesive tape is folded to enable the protective adhesive tape to be attached to the end face of the winding core, and the pole post end of the cover plate is connected with the connecting sheet through the switching sheet;

2. The lithium battery mounting structure according to claim 1, wherein: the roll core comprises a roll core body, an anode lug and a cathode lug, wherein the anode lug and the cathode lug are respectively arranged at two ends of the roll core body, and the anode lug and the cathode lug are both connected with the connecting sheet.

3. The lithium battery mounting structure according to claim 1, wherein: the cover plate comprises a base plate, a positive pole and a negative pole, wherein the positive pole and the negative pole are respectively arranged at two ends of the base plate, and the positive pole and the negative pole are connected with the connecting sheet through the connecting sheet.

4. A lithium battery mounting structure according to claim 3, wherein: and the base plate is also provided with a liquid injection hole and an explosion-proof valve.

5. The lithium battery mounting structure according to claim 1, wherein: and a chamfer is arranged at the edge of the positioning hole.

6. The lithium battery mounting structure according to claim 1, wherein: and a protective sheet is arranged between the protective adhesive tape and the connecting sheet.

7. The lithium battery mounting structure according to claim 1, wherein: the outside of the winding core group is also wrapped with an insulating film.

8. The lithium battery mounting structure according to claim 1, wherein: the outside of the winding core group is wrapped with a shell.