CN215988879U

CN215988879U - Multi-tab rubberizing adhesive paper and rubberizing structure thereof

Info

Publication number: CN215988879U
Application number: CN202121776284.5U
Authority: CN
Inventors: 曾琪; 韩冰; 苏轼; 郑开元; 纪荣进; 李聪; 陈贤锐; 郑明清; 陈杰
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-03-08
Anticipated expiration: 2031-08-02

Abstract

The utility model discloses a multi-tab rubberizing adhesive paper and a rubberizing structure thereof, wherein the multi-tab rubberizing adhesive paper comprises: the bonding part comprises a first bonding part and a second bonding part which are integrally formed; and the through hole is arranged between the first bonding part and the second bonding part. The multi-lug adhesive tape can be extended to the other side of the battery cell from one side of the battery cell through the welding folded lug on the side surface of the through hole cladding, the bonding area of the adhesive tape and the battery cell is increased, so that the bonding strength is improved, the welding folded lug is prevented from being opened due to stress, and meanwhile, compared with the prior art that two adhesive tapes are respectively adhered to two sides of the battery cell, the condition that two adhesive tapes are overlapped is caused.

Description

Multi-tab rubberizing adhesive paper and rubberizing structure thereof

FIELD OF THE UTILITY MODEL

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to multi-tab rubberizing adhesive paper and a rubberizing structure thereof.

Background

The lithium ion battery has the advantages of high energy density, light weight, good safety performance and the like, however, with the development of the times, people put forward higher requirements on the energy density, rate discharge, discharge temperature rise and the like of the lithium ion battery, but the lithium ion battery with a single tab can not meet the requirements gradually, so that the multi-tab structure gradually shows advantages.

However, the conventional tab is formed by welding the tabs in a transfer mode after the tabs are connected by a plurality of layers of foils, and then the tabs are folded to reduce the volume of the head of the battery cell occupied by the tabs, so that the conventional packaging can be carried out subsequently. The conventionality is at book utmost point ear in-process, need use twice adhesive tape to bond on utmost point ear welding position's positive and negative, risk and the position of fixing book utmost point ear that brings in order to prevent book utmost point ear owing to stress opens in order to reduce the other positions of welding area burr contact electric core, but the condition that the overlapping is glued to twice can appear once gluing in two sides respectively, the thickness of utmost point ear head has been increased, the energy density of many utmost point ear electric core has been reduced, the rubberizing area is big simultaneously, but the effective area that can bond is little, and the quantity of extravagant adhesive tape, the adhesive tape cost has been improved.

SUMMERY OF THE UTILITY MODEL

Based on the problems existing in the background art, the utility model aims to provide a multi-tab rubberizing adhesive tape and a rubberizing structure thereof, which can increase the bonding area between the adhesive tape and a battery cell, improve the bonding strength, prevent a welded folded tab from stretching due to stress, reduce the thickness of the adhesive tape at the head of the folded tab, improve the energy density of the multi-tab battery cell, save the using amount of the adhesive tape, and reduce the cost of the adhesive tape.

In order to achieve the above objects, in some embodiments, the present invention provides a multi-tab gumming paper, including:

the adhesive part comprises a first adhesive part and a second adhesive part which are integrally formed;

and a through hole disposed between the first bonding portion and the second bonding portion.

In the multi-tab gummed paper according to some embodiments, the shape of the through hole includes a closed figure having a rectangle, a diamond shape, an ellipse shape, two long sides being parallel straight lines, and two short sides being arc lines. Will the through-hole sets up to above-mentioned shape, can be fine lets external utmost point ear passes, simultaneously can be fine bond external utmost point ear with the many utmost point ear weld zone of foil reduces the risk that other positions of welding area burr contact electric core brought and fixes the position of rolling over utmost point ear in order to prevent to roll over utmost point ear because stress opens.

In the multi-tab gummed paper according to some embodiments, a long side of a circumscribed rectangle of the through hole is parallel to a short side of an outer contour of the bonding portion. The structure enables the bonding part to be well bonded on the positive side and the negative side of the battery cell, and meanwhile, the through hole enables the external tab to penetrate through the through hole well.

In the multi-tab gummed paper according to some embodiments, the outer contour of the bonding portion is rectangular. The outline of bonding portion is the rectangle and conveniently cuts the adhesive tape, can not cause the waste of adhesive tape simultaneously.

In the multi-tab gummed paper according to some embodiments, the first bonding portion and the second bonding portion have the same size. The bonding portion is the same with the size of the second bonding portion, makes the through-hole sets up the central point in bonding portion and puts, when adhesive tape bonds with electric core, will first bonding portion bonds the one side and the cladding welding of electric core main part roll over utmost point ear, through external utmost point ear passes the through-hole makes the second bonding portion bonds at the another side of electric core, can not cause the adhesive tape to overlap.

In the multi-tab gummed paper according to some embodiments, the bonding part includes a bonding layer and a base film. The adhesive layer is formed of an adhesive coated on either side of the base film, and the adhesive layer is adhered to the base layer.

The utility model also provides a rubberizing structure of the multi-tab rubberizing adhesive paper, which comprises the following components:

the battery cell main body comprises a foil multi-tab led out by the foil of the pole piece;

the external tab is provided with tab glue and is welded with the multi-tab foil;

the multi-tab gummed paper is characterized in that the bonding part is bonded with the electric core main body, and the through hole is sleeved on the external tab.

In the rubberizing structure according to some embodiments, the size of the through hole is larger than the size of the foil multi-tab and smaller than the size of the tab glue. The size of through-hole is greater than the size of foil multiple tab, and is less than during the size that utmost point ear was glued, need be in foil multiple tab with before external utmost point ear welded, will external utmost point ear passes multiple tab rubberizing adhesive tape the through-hole, later, foil multiple tab with external utmost point ear welds a utmost point ear, will again multiple tab rubberizing adhesive tape the bonding portion bonds in the positive and negative both sides of electric core main part, because multiple tab rubberizing adhesive tape the through-hole is less, can increase the bonding area, can open because stress with the position of reducing the risk that other positions of welding area burr contact electric core brought and fixing a utmost point ear simultaneously in order to prevent a utmost point ear because.

In the rubberizing structure according to some embodiments, the size of the through hole is larger than the size of the foil multi-tab and larger than the size of the tab glue. The size of through-hole is greater than the size of foil multi-tab, and is greater than during the size that utmost point ear was glued, multi-tab rubberized adhesive tape can external utmost point ear with the welding of foil multi-tab is back, carries out the rubberizing again, because the size of through-hole is greater than the size that utmost point ear was glued, so the passing through that multi-tab rubberized adhesive tape can be smooth utmost point ear is glued, consequently is in the size of through-hole is greater than the size of foil multi-tab and be greater than during the size that utmost point ear was glued, the rubberizing of carrying on that multi-tab rubberized adhesive tape can be convenient has saved the time of rubberizing.

In the rubberizing structure according to some embodiments, the cell main body is a winding structure composed of a positive plate, a diaphragm and a negative plate. And the battery cell main body is obtained by sequentially winding the positive plate, the diaphragm and the negative plate.

Compared with the prior art, the utility model at least comprises the following beneficial effects: in this application, the one side of electricity core is begun to multi-tab rubberizing adhesive tape, through the welding book utmost point ear of through-hole cladding side, extend to the another side of electricity core, the bonding area of adhesive tape and electricity core has been increased, thereby bonding strength has been promoted, prevent that welding book utmost point ear is because stress opens, respectively paste one with prior art at the two sides of electricity core simultaneously and glue one, the condition that the twice of appearing gluing overlapped becomes this application and only pastes one and glue one, the thickness of book utmost point ear head has been reduced, the energy density of multi-tab electricity core has been promoted, and compare in current rubberizing, the quantity of adhesive tape has been saved, the adhesive tape cost has been reduced.

Drawings

Fig. 1 is a schematic view of a multi-tab gummed paper of example 1 of the present application;

fig. 2 is a schematic view of a multi-tab gummed paper of example 3 of the present application;

fig. 3 is a schematic view of a multi-tab gummed paper of example 4 of the present application;

fig. 4 is a schematic view of a multi-tab gummed paper of example 5 of the present application;

FIG. 5 is a front view of a rubberized structure of example 6 of the present application;

FIG. 6 is a top view of a rubberized structure of example 6 of the present application;

FIG. 7 is a front view of a rubberized structure of example 7 of the present application;

FIG. 8 is a top view of a rubberized structure of example 7 of the present application;

in the figure: 1-sticking adhesive tape on multiple tabs; 11-adhesive part 11; 111-a first adhesive portion; 112-a second bonding portion; 12-a through hole; 2-a cell main body; 3, externally connecting a tab; and 4-pole lug glue.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

Example 1

As shown in fig. 1, the multi-tab gummed paper 1 includes: an adhesive portion 11, the adhesive portion 11 including a first adhesive portion 111 and a second adhesive portion 112; and a through-hole 12 provided between the first adhesive portion 111 and the second adhesive portion 112, the through-hole 12 having a rectangular shape. The adhesive part 11 includes a base film and an adhesive layer formed by coating an adhesive on any one surface of the base film, and the outer contour of the adhesive part 11 is rectangular. The through-holes 12 are formed by punching the base film before the adhesive is applied to the base film. The long sides of the through-hole 12 are parallel to the short sides of the outer contour of the adhesive part 11, and the size of the first adhesive part 111 is the same as the size of the second adhesive part 112.

Example 2

Unlike embodiment 1, the through-hole 12 of the present embodiment is formed by punching a base film coated with an adhesive.

The rest is the same as the embodiment 1, and the description is omitted.

Example 3

As shown in fig. 2, unlike embodiment 1, the through-hole 12 of the present embodiment has a rhombus shape, and the long side of the circumscribed rectangle of the elongated rhombus is parallel to the short side of the outer contour of the adhesive portion 11.

The rest is the same as the embodiment 1, and the description is omitted.

Example 4

As shown in fig. 3, unlike embodiment 1, the through-hole 12 of the present embodiment has an elliptical shape, and the long side of the circumscribed rectangle of the elliptical shape is parallel to the short side of the outer contour of the adhesive portion 11.

The rest is the same as the embodiment 1, and the description is omitted.

Example 5

As shown in fig. 4, unlike embodiment 1, the through-hole 12 of the present embodiment has a closed figure in which both long sides are parallel straight lines and both short sides are arc lines, and the long side of the circumscribed rectangle of the figure is parallel to the short side of the outer contour of the adhesive portion 11.

The rest is the same as the embodiment 1, and the description is omitted.

Example 6

As shown in fig. 5 to 6, a rubberizing structure of a multi-tab rubberizing adhesive paper 1 includes:

the battery cell comprises a battery cell main body 2 and a battery cell main body 2, wherein the battery cell main body 2 is obtained by sequentially winding a positive plate, a diaphragm and a negative plate, in the manufacturing process of the positive plate and the negative plate, the edge area of a current collector is not coated with active slurry, blank foil is left, the blank foil is cut into foil materials with multiple tabs, and the multi-tab battery cell is obtained after winding; or cleaning blank foil for welding the lugs at the edge of the current collector completely coated with the active slurry, welding a plurality of lugs, and winding to obtain the multi-lug battery core.

And the external tab 3 is provided with tab glue 4, and is welded with the multi-stage tabs after the multi-tab is prewelded for being electrically connected with the outside. The negative electrode tab comprises a nickel tab or a copper nickel-plated tab, and the positive electrode tab comprises an aluminum tab.

The multi-tab rubberizing adhesive paper comprises a multi-tab rubberizing adhesive paper 1, wherein a first bonding portion 111 is bonded on one side of an electric core main body 2, a second bonding portion 112 is bonded on the other side of the electric core main body 2, the size of a through hole 12 is larger than that of a foil multi-tab and smaller than that of tab glue 4, after the foil multi-tab is pre-welded and before the step of welding the foil multi-tab with an external tab 3, the external tab 3 firstly penetrates through the through hole 12 of the multi-tab rubberizing adhesive paper 1, the foil multi-tab and the tab 3 are finally welded, and tab rubberizing is performed after welding.

Example 7

As shown in fig. 7 to 8, different from embodiment 6, in this embodiment, the size of the through hole 12 is larger than the size of the foil multi-tab and larger than the size of the tab glue 4, and tab gluing can be performed after the foil multi-tab is welded to the tab 3.

The rest is the same as embodiment 6, and the description is omitted.

Example 8

Different from embodiment 6, the battery cell main body of this embodiment is manufactured by laminating a plurality of positive plates, a plurality of diaphragms, and a plurality of negative plates, wherein in the manufacturing process of the positive plates and the negative plates, a plurality of welding areas are cleaned in the edge area for welding tabs, and the multi-tab battery cell is obtained by laminating the plurality of positive plates, the plurality of negative plates, and the diaphragms.

The rest is the same as embodiment 6, and the description is omitted.

The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. For those skilled in the art to which the present application pertains, a number of simple deductions or substitutions can be made without departing from the inventive concept of the present application.

Claims

1. The utility model provides a many utmost points ear rubberizing adhesive tape which characterized in that includes:

2. The multi-tab gummed paper as claimed in claim 1, wherein the shape of the through hole comprises a closed figure with a rectangle, a diamond shape, an ellipse, two long sides being parallel straight lines and two short sides being arc lines.

3. The multi-tab gummed paper as claimed in claim 2, wherein the long side of the circumscribed rectangle of the through-hole is parallel to the short side of the outer contour of the bonding portion.

4. The multi-tab gummed paper as claimed in claim 1, wherein the outer contour of the bonding portion is rectangular.

5. The multi-tab gummed paper as claimed in claim 1, wherein the first bonding portion and the second bonding portion have the same size.

6. The multi-tab gummed paper as set forth in claim 1, wherein the bonding portion comprises a bonding layer and a base film.

7. The utility model provides a rubberizing structure of many utmost points ear rubberizing adhesive tape which characterized in that includes:

the multi-tab gummed paper as set forth in any one of claims 1 to 6, wherein the bonding portion is bonded to the cell main body, and the through hole is sleeved on the external tab.

8. The rubberized structure according to claim 7, wherein the size of said through holes is greater than the size of said foil multi-tab and smaller than the size of said tab glue.

9. The rubberized structure according to claim 7, wherein the size of said through holes is greater than the size of said foil multi-tab and greater than the size of said tab glue.

10. The rubberizing structure of the multi-tab rubberized adhesive paper according to claim 7, wherein the cell main body is a winding structure composed of a positive plate, a diaphragm and a negative plate.