CN214013113U

CN214013113U - Lithium ion battery connecting sheet and lithium ion battery

Info

Publication number: CN214013113U
Application number: CN202023230051.3U
Authority: CN
Inventors: 高顺航; 娄佳训; 于贺; 祖春吉; 马远
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-08-20
Anticipated expiration: 2030-12-28

Abstract

The utility model relates to a lithium ion battery connection piece and lithium ion battery, wherein, the lithium ion battery connection piece is including the utmost point ear connecting plate that has the intermediate lamella to and the utmost point post connecting plate on the intermediate lamella is connected through the guide portion of buckling. Due to the guiding of the bending guide portion, the pole connecting plate can be operated to bend relative to the middle plate, the outer surface of the bending guide portion is provided with the insulating patches, and when the pole connecting plate is bent, the insulating patches form a coating on the outer surface of the bending guide portion. Lithium ion battery connection piece, set up insulating paster through the surface at the guide portion of buckling to when utmost point post connecting plate is bent, constitute the cladding to the guide portion surface of buckling, from this can be when this connection piece is installed on electric core, effectively prevent to buckle and take place the short circuit inefficacy between guide portion and the electric core casing, thereby can promote the security performance of electric core.

Description

Lithium ion battery connecting sheet and lithium ion battery

Technical Field

The utility model relates to a power battery technical field, in particular to lithium ion battery connection piece, simultaneously, this application still relates to a lithium ion battery who has this lithium ion battery connection piece.

Background

With the increasing severity of the problem of energy shortage, new energy automobiles are more and more popular, the power battery is used as a power source of the new energy automobiles, the storage capacity of the power battery determines the endurance mileage of the automobiles, and the storage unit of the power battery is the battery core.

The lithium ion battery cell mainly comprises a cover plate, an aluminum shell and a winding core, and the cover plate and the winding core are connected through a connecting sheet so as to lead out the current of the winding core onto the cover plate. The existing connecting sheets are generally provided with fusing structures, and insulating structures are arranged at the fusing structures. However, in the production process of the battery core, the battery core needs to be bent, and the bending position of the battery core is close to the battery core shell, so that the problem of short circuit failure is easy to occur.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a lithium ion battery connection piece, it when installing on electric core, can effectively prevent to buckle and take place the short circuit between guide and the electric core casing to can improve the security performance of electric core.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a lithium ion battery connecting sheet comprises a tab connecting plate with a middle plate and a pole connecting plate connected to the middle plate through a bending guide part, wherein the pole connecting plate can be bent relative to the middle plate under the guidance of the bending guide part, and an insulating patch is arranged on the outer surface of the bending guide part; when the pole connecting plate is bent, the insulating patches coat the outer surface of the bending guide part.

Further, the insulating patch is made of a PET material.

Further, the bending guide is configured as a weak portion formed between the intermediate plate and the pole connecting plate.

Furthermore, a through hole is formed on the weak portion.

Furthermore, the tab connecting plate is connected with the intermediate plate through a fusing protection part, and the fusing protection part is wrapped with an encapsulating layer.

Further, before the pole connecting plate is bent, the insulating patch covers a part of the intermediate plate on the side of the bending guide portion.

Further, before the pole connecting plate is bent, the insulating patches fully cover the pole connecting plate on one side of the bending guide portion.

Compared with the prior art, the utility model discloses following advantage has:

(1) lithium ion battery connection piece, set up insulating paster through the surface at the guide portion of buckling to when utmost point post connecting plate is bent, constitute the cladding to the guide portion surface of buckling, from this can be when this connection piece is installed on electric core, effectively prevent to buckle and take place the short circuit inefficacy between guide portion and the electric core casing, thereby can promote the security performance of electric core.

(2) The insulating patch is made of PET material, so that the insulating patch has the advantages of smooth and glossy surface, good creep resistance, fatigue resistance, friction resistance, dimensional stability, small abrasion and high hardness.

(3) The bending guide part is a weak part formed between the intermediate plate and the pole connecting plate, has a simple structure, is convenient to design and implement, and can be convenient for the pole connecting plate to bend.

(4) Through forming the through-hole on the weak part, it not only can reduce the power of bending that utmost point post connecting plate needs, can prevent simultaneously that the thick both sides in the middle of appearing after utmost point post connecting plate bends are thin the condition in both sides to can reduce the thickness of connection piece, and then can improve the energy density of electric core.

(5) The overcurrent protection function can be realized by arranging the fusing protection part.

(6) Set up the rubber coating layer, then can prevent that utmost point ear connecting plate and intermediate lamella from taking place the secondary adhesion after opening circuit.

(7) The insulating patch covers the intermediate plate on the bent guide portion side, thereby improving the insulating performance of the connection sheet.

Another object of the present invention is to provide a lithium ion battery, which is equipped with the above-mentioned lithium ion battery connecting sheet.

Lithium ion battery, through adopting as above lithium ion battery connection piece, can prevent effectively that this connection piece and electric core shell from taking place the short circuit between to can make this lithium ion battery have better security performance.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a lithium ion battery connecting sheet according to an embodiment of the present invention before bending;

fig. 2 is a schematic structural diagram of a lithium ion battery connecting sheet according to an embodiment of the present invention at another viewing angle before bending;

FIG. 3 is a left side view of FIG. 1;

fig. 4 is a top view of fig. 1.

Description of reference numerals:

1. a middle plate; 2. an insulating patch; 3. a pole connecting plate; 4. a tab connecting plate; 401. a notch; 5. wrapping an adhesive layer; 6. a weakened portion; 601. and a through hole.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that if terms indicating orientation or positional relationship such as "upper" and "lower" are presented, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but they do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

In addition, the "outer surface" of the present embodiment is based on the lithium ion battery connecting sheet in the state where the pole connecting plate is bent.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a lithium ion battery connecting sheet, which comprises a tab connecting plate with a middle plate and a pole connecting plate connected to the middle plate through a bent guide part. Due to the guiding of the bending guide portion, the pole connecting plate can be operated to bend relative to the middle plate, the outer surface of the bending guide portion is provided with the insulating patches, and when the pole connecting plate is bent, the insulating patches form a coating on the outer surface of the bending guide portion.

The lithium ion battery connection piece of this embodiment sets up insulating paster through the surface at the guide portion of buckling to when utmost point post connecting plate is bent, constitute the cladding to the guide portion surface of buckling, can effectively prevent to buckle when this connection piece is installed on electric core from this and take place the short circuit failure between guide portion and the electric core casing, thereby can promote the security performance of electric core.

Based on the above design concept, an exemplary structure of the lithium ion battery connecting sheet of the present embodiment is as shown in fig. 1 to 4, and it has an "L" shaped sheet structure in an initial state. And the tab connecting plate 4 is connected with the intermediate plate 1 through a fusing protection part, and the fusing protection part and the pole connecting plate 3 are respectively connected with two adjacent sides of the intermediate plate 1. The fuse protection portion of the present embodiment is specifically a fuse link having a cross-sectional area smaller than that of the tab connection plate 4.

Wherein, as an embodiment, the width of the fuse link is smaller than that of the tab connection plate 4 so that the cross-sectional area thereof is smaller than that of the tab connection plate 4. As another possible embodiment, the width of the fuse link is equal to the area of the tab connection plate 4, and a fuse hole is formed in the fuse link. And on the premise of ensuring the connection strength of the lug connecting plate 4 and the intermediate plate 1, the fusing holes can be arranged at intervals.

As a preferred embodiment in this embodiment, the width of the fuse link is set to be smaller than that of the tab connection plate 4, and a fuse hole is further formed at the middle thereof. Further, the fuse hole may be formed as a rectangular hole to further reduce the current flow area.

In this embodiment, in order to prevent the tab connection plate 4 and the intermediate plate 1 from being adhered to each other for the second time after the circuit is broken, as shown in fig. 1, the fuse is wrapped with an encapsulating layer 5. Furthermore, as shown in fig. 1 and 2, in order to prevent the tab connection plate 4 from being deformed on one side and the other side during welding, a notch 401 is formed at the free end of the tab connection plate 4, and the notch 401 is located at the middle of the tab connection plate 4 and extends toward the intermediate plate 1 along the length direction thereof.

The bending guide portion of the present embodiment is specifically a weak portion 6 formed between the intermediate plate 1 and the pole connecting plate 3, and openings are formed on both sides of the weak portion 6. Through setting up the opening, can make the broken line that utmost point post connecting plate 3 buckled stabilize in open-ended width range to can effectively reduce the bending force. And as a preferred embodiment, the opening of the present embodiment is specifically a rectangular groove.

The opening adopts the rectangular channel to compare in other cell types such as adopting the triangular groove, and the requirement to the buckling line position can be reduced on one hand to one of them, only needs the buckling line to be located the width within range of rectangular channel, can make the height after utmost point post connecting plate 3 bends reach the requirement to but the risk of greatly reduced electric core short circuit.

In addition, as shown in fig. 1, a through hole 601 located between the two openings is formed in the middle of the weak portion 6, which not only reduces the bending force required by the terminal connecting plate 3, but also prevents the terminal connecting plate 3 from being thick in the middle and thin at two sides after being bent compared with a structure without the through hole 601, so that the thickness of the connecting sheet can be reduced, and the energy density of the battery cell can be improved. In a preferred embodiment, the width of the through hole 601 is the same as the width of the opening, and a plurality of through holes 601 may be provided to ensure the connection strength between the intermediate plate 1 and the pole connecting plate 3, in addition to one through hole 601 shown in fig. 1.

As shown in fig. 2, as mentioned above, the insulating patch 1 of the present embodiment is specifically disposed at the outer surface of the weak portion 6 (i.e. the back surface in the state of fig. 1), so that when the terminal connecting plate 3 is bent, the insulating patch 2 covers the outer surface of the weak portion 6, and when the terminal bending plate 3 is bent, the insulating patch 2 faces the cell casing, so as to effectively prevent a short circuit between the connecting plate and the cell casing.

The insulating patch 2 of the present embodiment is made of PET, so that the insulating patch has the advantages of smooth surface, gloss, creep resistance, fatigue resistance, abrasion resistance, good dimensional stability, small abrasion, and high hardness. Of course, the insulating patch 7 can be made of other soft insulating materials besides PET.

In addition, in order to improve the insulating property of the connection sheet and effectively prevent a short circuit between the connection sheet and the cell casing, the insulating patch 2 of the present embodiment is further configured to cover the portion 1 of the intermediate plate on the weak portion 6 side before the terminal connection plate 3 is bent. Further, in addition to the insulating patches 2 constituting a partial covering of the intermediate plate 1 as shown in fig. 2, the insulating patches 2 may be attached to the post connection plate 3 so as to constitute a full covering of the post connection plate 3 on the side of the weak portion 6 before the post connection plate 3 is bent, and this structure can also improve the insulating performance of the present connection plate.

Of course, in addition to the above-described structure, the insulating sheet 2 may also be formed to cover the intermediate plate 1, the weak portion 6, and the post connection plate 3 at the same time, and this structure may increase the processing cost although the insulating performance of the connection plate can be improved.

The lithium battery ion battery connection piece of this embodiment sets up rubber coating layer 5 through protecting the portion at the fusing to the setting can constitute to the insulating paster 2 of the 1 cladding of weak part 6 and partial intermediate lamella, can prevent effectively that weak part 6 from buckling the back and taking place the short circuit with electric core shell, can further improve the security performance of electric core.

In addition, this embodiment still relates to a lithium ion battery, and this lithium ion battery is equipped with the lithium ion battery connection piece as above.

The lithium ion battery of the embodiment can effectively prevent the short circuit between the connecting sheet and the battery cell shell by adopting the lithium ion battery connecting sheet, thereby ensuring that the lithium ion battery has better safety performance.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a lithium ion battery connection piece, is including utmost point ear connecting plate (4) that have intermediate lamella (1) to and connect through the guide portion of buckling utmost point post connecting plate (3) on intermediate lamella (1), because of the guide portion of buckling, utmost point post connecting plate (3) are operable for intermediate lamella (1) is bent, its characterized in that: an insulating patch (2) is arranged on the outer surface of the bending guide part; when the pole connecting plate (3) is bent, the insulating patch (2) covers the outer surface of the bent guide part.

2. The lithium ion battery tab of claim 1, wherein: the insulating patch (2) is made of PET material.

3. The lithium ion battery tab of claim 1, wherein: the bending guide is configured as a weak section (6) formed between the intermediate plate (1) and the pole connecting plate (3).

4. The lithium ion battery tab of claim 3, wherein: a through hole (601) is formed in the weak portion (6).

5. The lithium ion battery tab of claim 1, wherein: the tab connecting plate (4) is connected with the intermediate plate (1) through a fusing protection part, and the fusing protection part is wrapped with an encapsulating layer (5).

6. The lithium ion battery tab of claim 1, wherein: before the pole connecting plate (3) is bent, the insulating patch (2) covers the middle plate (1) on one side of the bending guide part.

7. The lithium ion battery tab of any one of claims 1-6, wherein: before the pole connecting plate (3) is bent, the insulating patches (2) are used for fully covering the pole connecting plate (3) on one side of the bending guide part.

8. A lithium ion battery, characterized by: the lithium ion battery is provided with a lithium ion battery connecting sheet according to any one of claims 1 to 7.