CN213660577U

CN213660577U - Pole lug protection support piece of lithium battery

Info

Publication number: CN213660577U
Application number: CN202022969615.9U
Authority: CN
Inventors: 杨震; 何波
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-07-09
Anticipated expiration: 2030-12-10

Abstract

The utility model discloses a utmost point ear protection support piece of lithium cell, including plane screening glass, the spacing piece of chamfer one, the spacing piece two of chamfer, chamfer connection piece one and chamfer connection piece two, set up the spacing piece one of chamfer and the spacing piece two of chamfer respectively on the both sides edge of plane screening glass, set up chamfer connection piece one to the inboard on the spacing piece one of chamfer, be provided with chamfer connection piece two to the inboard on the spacing piece two of chamfer. The utility model can prevent the metal scrap at the welding position from dropping to damage the battery; the part of the tab which is connected with the welding seal and is close to the pole is prevented from vertically and downwards stabbing into the winding core, so that the safety of the winding core is effectively protected; the battery has the advantages that the battery also has the effect of limiting the tabs while protecting the tabs, so that the tab states of the two winding cores are consistent, the operation is simple, and the production efficiency is greatly improved while the structure and the performance of the battery are protected; the pole lug can be prevented from being damaged due to stress concentration when the pole lug is bent.

Description

Pole lug protection support piece of lithium battery

Technical Field

The utility model belongs to the technical field of the lithium cell, especially, relate to a utmost point ear protection support piece of lithium cell.

Background

Because the power battery needs the capacity great, will form battery module jointly to individual monomer electricity core usually, and single electric core is too thick in battery module for utmost point ear produces the dislocation easily, and unable effective control utmost point ear position has improved production technology's the degree of difficulty coefficient. At present, batteries with a multi-winding core parallel structure exist, but the batteries with the structure need to weld the tabs and the connecting sheets or the posts and then fold the tabs by 90 degrees so as to realize the lamination of the tab wrapping and clamping core bodies of a plurality of winding cores.

The existing multi-core power battery is optimized and improved aiming at the aspects of firm tab welding, strong conductivity and the like, but the following four problems are ignored: firstly, metal chips at the welding position drop to pierce through the diaphragm to cause short circuit of the battery; secondly, after the tab is welded, the part of the tab which is connected with the welding seal and is close to the pole is vertically downward, so that the tab is easy to be inserted and punctured into the winding core upside down, and large damage is caused to the winding core; thirdly, in order to ensure that the lugs of the two winding cores need to be bent for the lamination of the winding cores, and because a certain gap exists between the two winding core lugs, the two winding core lugs are not limited during the bending, so that the acting force applied to the two winding core lugs is not uniform, the stress distribution and the stress size on the two winding core lugs after the two winding core lugs are bent are not uniform, the electrical conductivities of the lugs of the two winding cores are not uniform, the electrical properties of the two winding cores are not uniform, and adverse effects are caused on the overall capacity, the service life and; fourthly, because the winding pole piece has more layers and also has multiple layers of tabs correspondingly, in the bending process, because a certain gap exists between the two winding core tabs, the multilayer tabs of a single winding core are influenced. When the electrode lugs are bent, the multi-layer electrode lugs are stressed unevenly and wrinkles, gaps and the like may exist during bending, so that a plurality of adverse phenomena of untight connection, increased local thickness, increased internal resistance, lowered conductivity and the like are caused, local heating is caused to cause the performance of the battery to be lowered, and the performance of the battery is further and further poor in the use cycle process.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a pole ear protection support piece of a lithium battery, which can prevent metal scraps at a welding position from dropping to damage the battery; the part of the tab which is connected with the welding seal and is close to the pole can be prevented from vertically and downwards stabbing into the winding core, so that the safety of the winding core is effectively protected; the battery has the advantages that the battery also has the effect of limiting the tabs while protecting the tabs, so that the tab states of the two winding cores are consistent, the operation is simple, and the production efficiency is greatly improved while the structure and the performance of the battery are protected; the pole lug can be prevented from being damaged due to stress concentration when the pole lug is bent.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a utmost point ear protection support piece of lithium cell, includes plane screening glass, the spacing piece of chamfer one, the spacing piece two of chamfer, chamfer connection piece one and chamfer connection piece two set up the spacing piece one of chamfer and the spacing piece two of chamfer respectively on the both sides edge of plane screening glass the spacing piece one of chamfer sets up chamfer connection piece one to the inboard the spacing piece two of chamfer are gone up and are provided with chamfer connection piece two to the inboard.

Further, a through hole penetrating through the plane protection sheet is formed in the plane protection sheet.

Further, the through-hole is including annotating liquid locating hole and explosion-proof valve opening, explosion-proof valve opening is located plane screening glass middle part, it is located explosion-proof valve opening next door to annotate the liquid locating hole.

Furthermore, two liquid injection positioning holes are formed in the plane protection sheet, and two sides of the explosion-proof valve hole are respectively provided with one liquid injection positioning hole. The middle explosion-proof valve hole that is, the hole on both sides is for annotating the liquid locating hole, and the benefit of designing two holes lies in all can annotating the liquid through any one hole, need not distinguish positive and negative direction, convenient to use.

Further, the plane protection piece includes base plate, viscose layer and oilpaper layer the base plate lower surface is provided with the viscose layer the adhesion has the oilpaper layer to paste on the viscose layer. The planar protection sheet is provided with glue and a sticker, the sticker is removed during use, the sheet is directly pasted at the welding position of the two roll core lugs according to the positions of the liquid injection hole, the explosion-proof valve and the like, and due to the limiting effect of the chamfer limiting sheet, the two roll core lugs can be directly and rapidly bent to enable the two roll core bodies to be completely pasted, so that the production efficiency is greatly improved.

Furthermore, the plane protection plate is vertically connected with the first chamfer limiting plate, and the plane protection plate is vertically connected with the second chamfer limiting plate.

Furthermore, the first chamfer connecting piece is parallel to the plane protection sheet, and the second chamfer limiting piece is parallel to the plane protection sheet.

Further, the length of the plane protection sheet is equal to the width of the two core winding tabs, and the width of the plane protection sheet is the width of the tab bent when the two core windings are completely attached. Can effectively laminate on rolling up core utmost point ear, guarantee the protection effect.

The beneficial effects of the technical scheme are as follows:

the utility model provides a tab protection support sheet acting on the welding position and the bending position of two roll core tabs, wherein the plane protection sheet can prevent metal filings at the welding position from dropping, pierce through the diaphragm to cause the short circuit of the battery, and prevent the metal filings at the welding position from dropping to cause damage to the battery; the part of the tab which is connected with the welding seal and is close to the pole can be prevented from vertically and downwards stabbing into the winding core, and the safety of the winding core is effectively protected. The chamfer limiting sheet can play a limiting role at the bending position of the lug, so that the lug with two winding cores is uniformly stressed, and the multilayer lug with a single winding core is uniformly stressed; the limiting lug has the effect of protecting the lug, so that the lug states of the two winding cores are consistent, the operation is simple, and the production efficiency is greatly improved while the structure and the performance of the battery are protected. The chamfer connecting piece connected with the plane protection sheet can avoid the damage of the tab caused by stress concentration when the tab is bent; the part of the chamfer limiting sheet, which is vertical to the plane protection sheet, has a certain width, so that the problem of stress concentration and the like caused by too small contact area can be avoided to damage the lug; the sharp corner of the chamfer limiting piece can be prevented from puncturing the lug by arranging the chamfer connecting piece.

Drawings

Fig. 1 is a schematic structural view of a tab protection support member of a lithium battery according to the present invention;

fig. 2 is a top schematic view of a tab protection support member of a lithium battery according to the present invention;

wherein, 1 is the plane protection piece, 2 is the spacing piece of chamfer one, 3 is the spacing piece of chamfer two, 4 is the chamfer connection piece one, 5 is the chamfer connection piece two, 6 is the notes liquid locating hole, 7 is explosion-proof valve hole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further explained below with reference to the accompanying drawings.

In this embodiment, referring to fig. 1-2, a tab protection support member for a lithium battery includes a planar protection sheet 1, a first chamfer limiting sheet 2, a second chamfer limiting sheet 3, a first chamfer connecting sheet 4 and a second chamfer connecting sheet 5, wherein the first chamfer limiting sheet 2 and the second chamfer limiting sheet 3 are respectively disposed on two side edges of the planar protection sheet 1, the first chamfer connecting sheet 4 is disposed on the first chamfer limiting sheet 2 to the inner side, and the second chamfer connecting sheet 5 is disposed on the second chamfer limiting sheet 3 to the inner side.

As a preferred embodiment 1 of the above embodiment, a through hole penetrating the planar protective sheet 1 is provided in the planar protective sheet 1.

The through-hole is including annotating liquid locating hole 6 and explosion-proof valve opening 7, explosion-proof valve opening 7 is located plane protection piece 1 middle part, annotate liquid locating hole 6 and be located explosion-proof valve opening 7 next door.

Preferably, two liquid injection positioning holes 6 are formed in the planar protection sheet 1, and two liquid injection positioning holes 6 are formed in two sides of the explosion-proof valve hole 7. The middle explosion-proof valve hole 7 that is, the hole on both sides is for annotating liquid locating hole 6, and the benefit of designing two holes lies in all can annotating the liquid through any one hole, need not distinguish positive and negative direction, convenient to use.

As an optimized solution 2 of the above embodiment, the plane protection sheet 1 includes a substrate, an adhesive layer and an oil paper layer, the adhesive layer is disposed on the lower surface of the substrate, and the oil paper layer is attached to the adhesive layer. The planar protection sheet 1 is provided with glue and a sticker, the sticker is removed during use, the sheet is directly pasted at the welding and printing position of the two winding core lugs according to the positions of the liquid injection hole, the explosion-proof valve and the like, and due to the limiting effect of the chamfer limiting sheet, the two winding core lugs can be directly and rapidly bent to enable the two winding core bodies to be completely pasted, so that the production efficiency is greatly improved.

As an optimized solution 3 of the above embodiment, the planar protection sheet 1 and the first chamfer limiting sheet 2 are perpendicularly connected to each other, and the planar protection sheet 1 and the second chamfer limiting sheet 3 are perpendicularly connected to each other.

The first chamfer connecting piece 4 is parallel to the plane protection sheet 1, and the second chamfer limiting piece 3 is parallel to the plane protection sheet 1.

As an optimized solution 4 of the above embodiment, the length of the planar protection sheet 1 is equal to the width of the two-core rolled tab, and the width of the planar protection sheet 1 is the width of the tab bent when the two cores are completely attached. Can effectively laminate on rolling up core utmost point ear, guarantee the protection effect.

For better understanding, the utility model discloses, following is to the theory of operation of the utility model make a complete description:

the tab protection support sheet acts on the tab welding and printing positions and the tab bending positions of the two winding cores, wherein the plane protection sheet 1 can prevent metal scraps at the welding and printing positions from falling off, more importantly, can prevent the tab which is connected with the welding and printing positions and is close to the terminal from vertically downwards sticking into the winding cores in a reverse insertion mode, and effectively protects the safety of the winding cores; the chamfering limiting sheet can play a limiting role at the bending position of the lug, so that the lug with two winding cores is uniformly stressed, and the multilayer lug with a single winding core is uniformly stressed. Moreover, the chamfer connecting piece connected with the plane protection sheet 1 can avoid the damage of the tab caused by stress concentration when the tab is bent; the chamfer connecting piece can also prevent the sharp corner of the chamfer limiting sheet from puncturing the pole lug.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a utmost point ear protection support piece of lithium cell, its characterized in that includes plane screening glass (1), the spacing piece of chamfer (2), the spacing piece of chamfer two (3), chamfer connection piece (4) and chamfer connection piece two (5) set up the spacing piece of chamfer (2) and the spacing piece of chamfer two (3) respectively on the both sides limit of plane screening glass (1) set up chamfer connection piece (4) to the inboard on the spacing piece of chamfer (2) be provided with chamfer connection piece two (5) to the inboard on the spacing piece of chamfer two (3).

2. The tab protection support member for a lithium battery as claimed in claim 1, wherein a through hole penetrating the planar protection sheet (1) is provided on the planar protection sheet (1).

3. The tab protection support member of a lithium battery as claimed in claim 2, wherein the through hole comprises a liquid injection positioning hole (6) and an explosion-proof valve hole (7), the explosion-proof valve hole (7) is located in the middle of the planar protection plate (1), and the liquid injection positioning hole (6) is located beside the explosion-proof valve hole (7).

4. The tab protection support member for a lithium battery as claimed in claim 3, wherein two liquid injection positioning holes (6) are provided on the planar protection sheet (1), and one liquid injection positioning hole (6) is provided on each of both sides of the explosion-proof valve hole (7).

5. The tab protection support member for a lithium battery as claimed in any one of claims 1 to 4, wherein the plane protection sheet (1) comprises a base plate, an adhesive layer and a paper layer, the adhesive layer is disposed on the lower surface of the base plate, and the paper layer is attached to the adhesive layer.

6. The tab protection supporting member for a lithium battery as claimed in any one of claims 1 to 4, wherein the planar protection sheet (1) and the first chamfer limiting sheet (2) are perpendicularly connected to each other, and the planar protection sheet (1) and the second chamfer limiting sheet (3) are perpendicularly connected to each other.

7. The tab protection support member for a lithium battery as claimed in claim 6, wherein the first chamfer connecting piece (4) is parallel to the planar protection sheet (1), and the second chamfer limiting piece (3) is parallel to the planar protection sheet (1).

8. The tab protection support member for a lithium battery as claimed in any one of claims 1 to 4, wherein the length of the planar protection sheet (1) is equal to the width of the tab of two rolls of cores, and the width of the planar protection sheet (1) is the width of the tab bent when the two rolls of cores are completely attached.