CN210668439U

CN210668439U - Large capacity battery top cap subassembly

Info

Publication number: CN210668439U
Application number: CN201921657044.6U
Authority: CN
Inventors: 郑涛; 王海文
Original assignee: Jiangxi Zhongqi Ruihua New Energy Technology Co ltd
Current assignee: Jiangxi Zhongqi Ruihua New Energy Technology Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-06-02
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a large capacity battery top cap subassembly, including the top cap piece, the surface left and right sides of top cap piece is equipped with negative thread utmost point post and positive thread utmost point post respectively, and the connection piece has all been welded to top cap negative thread utmost point post and positive thread utmost point post bottom, and wherein the connection piece from the top down includes I shape connection piece and plane type connection piece, and plane type connection piece welded fastening is in negative thread utmost point post and positive thread utmost point post bottom, and I shape connection piece welded fastening is on the surface of plane type connection piece simultaneously. The utility model discloses a support of backing sheet makes the position of top piece improve, and then has increased the thickness interval between top piece surface and the plane connection piece bottom surface, can satisfy the requirement of large capacity battery heavy current to connection piece thickness, simultaneously because the design of I shape connection piece has realized the thickness requirement promptly, has also alleviateed weight, has avoided the great condition of weight when directly using the plane connection piece to fix whole thickness and reach.

Description

Large capacity battery top cap subassembly

Technical Field

The utility model belongs to the power battery field relates to a large capacity battery top cap subassembly.

Background

With the increasing demand of energy density in the industry, apart from the research on new materials, the optimization of the structure is a good choice on the basis of the existing materials, wherein the large size of the battery cell is a better scheme.

After the battery cell is enlarged, the volume and the weight are correspondingly increased, the connecting sheet is also very thick in order to meet the requirement of conductive current, the challenge is to laser welding and ultrasonic welding, and meanwhile, after the battery cell is enlarged, the carrying times are reduced in the working procedure.

The utility model discloses a utility model patent application number CN201820702352.5 wherein discloses a battery top cap subassembly, this battery top cap subassembly is equipped with annotates the liquid hole, it is greater than the step hole of end opening diameter for the end opening diameter to annotate the liquid hole, when annotating the liquid, the end opening and the notes liquid mouth in close contact with of annotating the liquid hole, do benefit to and annotate the liquid, annotate liquid hole end opening contactless notes liquid mouth simultaneously, prevent the pollution of electrolyte, there is very big improvement to annotating the sealed nail welding goodness in liquid hole, be equipped with explosion-proof valve on the top cap simultaneously, when the internal combustion takes place at the battery, pressure increase, in time, blast through explosion-proof valve and exhaust, play the safety protection effect, and can not have. However, the battery top cover plate does not consider that when the capacity of the battery is increased, the size and the weight of the battery core are increased correspondingly, so that the connecting sheet is also very thick, and the carrying frequency is increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a large capacity battery top cap subassembly overlaps earlier the PP membrane on top cap utmost point post, before the middle ladle PP membrane process in the back end, places the PP membrane in advance, guarantees to accomplish this process under the not transport electric core condition, reduces the transport number of times.

The purpose of the utility model can be realized by the following technical scheme:

the utility model provides a large capacity battery top cap subassembly, includes the top cap piece, and the surface left and right sides of top cap piece is equipped with negative thread utmost point post and positive thread utmost point post respectively, and the connection piece has all been welded to top cap negative thread utmost point post and positive thread utmost point post bottom, and wherein the connection piece from the top down includes I shape connection piece and plane type connection piece, and plane type connection piece welded fastening is in negative thread utmost point post and positive thread utmost point post bottom, and I shape connection piece welded fastening is on the surface of plane type connection piece simultaneously.

Furthermore, the bottoms of the top cover negative thread pole and the top cover positive thread pole are both sleeved with PP films, and the PP films are located between the top cover plate and the planar connecting sheet.

Further, the welding mode adopts laser welding or ultrasonic welding.

Furthermore, the I-shaped connecting piece comprises a welding piece, one end of the welding piece is vertically bent upwards to form a supporting piece, the top end of the supporting piece is vertically bent to form a top piece which is horizontally distributed, a plurality of waist-shaped holes are formed in the surface of the welding piece, and the welding piece is welded and fixed with the surface of the planar connecting piece.

The utility model has the advantages that:

1. the utility model discloses before the middle ladle PP membrane process of back end, place the PP membrane in advance, guarantee to accomplish this process under the not transport electric core condition, reduce the transport number of times.

2. The utility model discloses the surface that passes waist shape hole and enter into the plane connection piece in welding process welds the plane connection piece on utmost point post, and then can realize that unmovable plane connection piece keeps carrying out effectual welding under the certain condition in position between plane connection piece and the I shape connection piece.

3. The utility model discloses a support of backing sheet makes the position of top piece improve, and then has increased the thickness interval between top piece surface and the plane connection piece bottom surface, can satisfy the requirement of large capacity battery heavy current to connection piece thickness, simultaneously because the design of I shape connection piece, realized the thickness requirement promptly, also lightened weight, the great condition of weight in when having avoided directly using the plane connection piece to fix whole thickness and having reached, the requirement of large capacity battery heavy current to connection piece thickness has been solved.

Drawings

The present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a high capacity battery top cap assembly of the present invention;

FIG. 2 is a top view of the partial structure of FIG. 1;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a bottom view of the battery top cap assembly;

FIG. 5 is an enlarged view of a portion of FIG. 3;

FIG. 6 is a schematic view of a sealing rubber nail structure;

FIG. 7 is a schematic structural view of a high capacity battery top cap assembly;

FIG. 8 is a schematic structural view of a high capacity battery top cover assembly sleeved with a PP film;

FIG. 9 is a schematic view of an I-shaped connecting piece;

fig. 10 is a schematic view of a planar connecting sheet structure.

Detailed Description

A high-capacity battery top cover assembly is shown in figures 1, 2, 3, 4, 5 and 6 and comprises a top cover plate 1, wherein the left side and the right side of the surface of the top cover plate 1 are respectively provided with a negative thread pole 4 and a positive thread pole 5, the negative thread pole 4 and the positive thread pole 5 are fixed on the top cover plate 1 in a rubber encapsulation mode, and a sealing ring is arranged in the top cover assembly to prevent air leakage and electrolyte precipitation; the negative-thread pole 4 and the positive-thread pole 5 are used for manufacturing a battery pack, and play a role in fixing the soft connecting sheet when the soft connecting sheet is welded, or directly fix the soft connecting sheet on a threaded hole when the pack charging and discharging current is not large enough;

the surface of the top cover plate 1 is provided with the explosion-proof valve 2 at one side of the negative thread pole 4, when the battery is subjected to internal combustion, the pressure is increased, the explosion and the exhaust are carried out through the explosion-proof valve 2 in time, the safety protection effect is achieved, and the phenomenon of air leakage cannot occur before the explosion;

the surface of the top cover plate 1 is positioned between the explosion-proof valve 2 and the positive thread pole 5 and is provided with the liquid injection hole 3, the liquid injection hole 3 is a step port, the diameter of the top port of the liquid injection hole 3 is 3-5 times of that of the bottom port, during liquid injection, the bottom port of the liquid injection hole 3 is in close contact with the liquid injection nozzle, so that liquid injection is facilitated, meanwhile, the top port of the liquid injection hole 3 is not in contact with the liquid injection nozzle, the pollution of electrolyte is prevented, and the welding goodness of the sealing nail of the liquid injection hole 3 is greatly improved; the sealing rubber nail 7 is arranged in the liquid injection hole 3 in an interference fit manner, the sealing rubber nail 7 comprises a sealing column 71 and a baffle table 72, the sealing column 71 is of a cone frustum structure and is in interference fit with the liquid injection hole 3, negative pressure is pumped after liquid injection is completed, then the sealing rubber nail 7 is inserted into the liquid injection hole 3 to play a role in negative pressure and pressure maintaining, and a great role in fully absorbing electrolyte by a naked electric core is played, so that great help is brought to capacity improvement;

two oppositely arranged top supports 6 are fixed on the left side and the right side of the bottom surface of the top cover plate 1, the top supports 6 are plastic parts, the two plastic parts are mechanically fixed on the bottom surface of the top cover plate 1, the injection molding is directly carried out on the top cover plate 1, the deformation is large, the deformation of the directly fixed plastic part supports is small, and the internal short circuit caused by the contact of a bare cell lug and an aluminum shell can be avoided;

as shown in fig. 7, 8, 9 and 10, the bottoms of the cap negative-thread pole 4 and the positive-thread pole 5 are both sleeved with a PP film 10, wherein the surface of the PP film 10 is provided with a sleeved hole matched with the cap negative-thread pole 4 and the positive-thread pole 5, the PP film 10 directly passes through the sleeved hole through the bottoms of the cap negative-thread pole 4 and the positive-thread pole 5 and is sleeved between the cap negative-thread pole 4 and the positive-thread pole 5, then a rear-section PP film wrapping process is performed, the PP film is placed in advance, the process is guaranteed to be completed under the condition that a battery cell is not carried, the carrying times are reduced, the working hours are reduced, and the risk of damage to the battery cell by carrying is reduced;

the back end package PP membrane process places the PP membrane in advance, and naked electric core assembly process includes promptly: the process comprises the steps of ultrasonic welding of the tab, laser welding of the connecting sheet, wrapping of the PP film and the like, wherein the PP film is placed in advance, namely the PP film is placed in the process of laser welding of the connecting sheet, the process of wrapping of the PP film is transferred after laser welding, a clamp is not required to be replaced, the PP film placed in advance is directly wrapped, and one-time bare cell carrying is reduced;

connecting pieces are welded at the bottoms of the top cover negative threaded pole 4 and the positive threaded pole 5, wherein the connecting pieces comprise an I-shaped connecting piece 8 and a planar connecting piece 9 from top to bottom, the planar connecting piece 9 is welded and fixed at the bottoms of the negative threaded pole 4 and the positive threaded pole 5, before the planar connecting piece 9 is welded, a PP film is sleeved at the bottoms of the top cover negative threaded pole 4 and the positive threaded pole 5, the negative threaded pole 4 and the positive threaded pole 5 extend out of sleeved holes in the surface of the PP film, then the planar connecting piece 9 is pressed on the bottom surface of the pole, welding is carried out, and meanwhile, the I-shaped connecting piece 8 is welded and fixed on the surface of the planar connecting piece 9; the fixing of the PP film is realized by welding the I-shaped connecting sheet 8 and the planar connecting sheet 9, and the PP film is positioned between the top cover sheet and the planar connecting sheet;

the welding mode can adopt laser welding or ultrasonic welding;

the I-shaped connecting piece 8 comprises a welding piece 81, one end of the welding piece 81 is vertically bent upwards to form a supporting piece 82, the top end of the supporting piece 82 is vertically bent to form a top piece 83 which is horizontally distributed, a plurality of waist-shaped holes 84 are formed in the surface of the welding piece 81, and the welding piece 81 is welded and fixed with the surface of the planar connecting piece 9; when the welding device is installed, firstly, the planar connecting sheet 9 is placed on the bottom surfaces of the negative threaded pole 4 and the positive threaded pole 5, then the welding sheet 81 of the I-shaped connecting sheet 8 is placed on the surface of the planar connecting sheet 9, the side wall of the welding sheet 81 and the side wall of the planar connecting sheet 9 are kept in the same horizontal plane, after the position adjustment of the I-shaped connecting sheet 8 and the planar connecting sheet 9 is completed, the welding head of the welding device penetrates through the waist-shaped hole 84 to enter the surface of the planar connecting sheet 9 to weld the planar connecting sheet 9 on the pole, further, the effective welding can be carried out under the condition that the position between the planar connecting sheet 9 and the I-shaped connecting sheet 8 is kept to be constant without moving the planar connecting sheet 9, then the position of the non-waist-shaped hole 84 on the surface of the welding sheet, the position of the top plate 83 is improved due to the support of the support sheet 82, so that the thickness distance between the surface of the top plate 83 and the bottom surface of the planar connecting sheet 9 is increased, the requirement of large current of a large-capacity battery on the thickness of the connecting sheet can be met, meanwhile, due to the design of the I-shaped connecting sheet 8, the thickness requirement is met, the weight is reduced, and the condition that the whole thickness is large when the whole thickness is reached when the planar connecting sheet is directly used for fixing is avoided.

The foregoing is merely exemplary and illustrative of the structure of the invention, and various modifications, additions and substitutions as described in the detailed description may be made by those skilled in the art without departing from the structure or exceeding the scope of the invention as defined in the claims.

Claims

1. The utility model provides a large capacity battery top cap subassembly, including top cap piece (1), the surface left and right sides of top cap piece (1) is equipped with negative thread utmost point post (4) and positive thread utmost point post (5) respectively, a serial communication port, the connection piece has all been welded bottom top cap negative thread utmost point post (4) and positive thread utmost point post (5), wherein the connection piece from the top down includes I shape connection piece (8) and plane type connection piece (9), plane type connection piece (9) welded fastening is in negative thread utmost point post (4) and positive thread utmost point post (5) bottom, I shape connection piece (8) welded fastening is on the surface of plane type connection piece (9) simultaneously.

2. The high-capacity battery top cover assembly according to claim 1, wherein the bottoms of the top cover negative threaded pole (4) and the positive threaded pole (5) are respectively sleeved with a PP film (10), and the PP films (10) are positioned between the top cover plate (1) and the planar connecting sheet (9).

3. A high capacity battery cap assembly according to claim 1, wherein the welding is laser welding or ultrasonic welding.

4. A high capacity battery top cover assembly as claimed in claim 1, wherein the I-shaped connecting piece (8) comprises a welding piece (81), one end of the welding piece (81) is vertically bent upwards to form a supporting piece (82), the top end of the supporting piece (82) is vertically bent to form a horizontally distributed top piece (83), a plurality of waist-shaped holes (84) are formed in the surface of the welding piece (81), and the welding piece (81) is welded and fixed with the surface of the planar connecting piece (9).