CN210897463U

CN210897463U - Pole lug for lithium battery

Info

Publication number: CN210897463U
Application number: CN201922068905.3U
Authority: CN
Inventors: 陈新虹
Original assignee: Suzhou Yilai Kede Technology Co ltd
Current assignee: Suzhou Yilai Kede Technology Co ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-06-30
Anticipated expiration: 2029-11-26

Abstract

The utility model discloses a utmost point ear for lithium cell for be connected with the electrode of lithium cell, utmost point ear includes a plurality of utmost point auricles and at least one separator, utmost point auricles are including the first portion and the second portion that meet, and are a plurality of utmost point auricles pass through respectively first portion is connected in order to form a encapsulation portion, the one end of encapsulation portion with the electrode is connected, the parcel has the white glue on the other end of encapsulation portion, the separator sets up adjacent two so that adjacent two between the second portion of utmost point auricle the second portion interval sets up to make adjacent two form hollow structure between the second portion. The utility model discloses the scheme that adopts has the surface area that can improve utmost point auricle by a wide margin in limited space to can answer the advantage of the heat dispersion who improves utmost point ear.

Description

Pole lug for lithium battery

Technical Field

The utility model relates to a lithium cell technical field, specific be a utmost point ear for lithium cell.

Background

The soft package lithium ion battery has the advantages of large energy density, good safety performance, long cycle life and the like, thereby being widely applied. With the rapid development of new energy automobiles and electronic products, the market scale of the flexible package battery and the battery pack thereof will rapidly increase. The soft package battery is developed for a long time, and the improvement of various performances of the soft package battery is a key. The rate performance of the flexible package lithium ion battery is improved by considering the battery structure, the heat dissipation effect of the top sealing part is poor due to the fact that the tab with the adhesive is packaged on an aluminum plastic film when the large current of the flexible package lithium ion battery is discharged, the tab is overheated to influence the battery performance, the tab with the high temperature can cause battery leakage, and the reasonable tab structure with the adhesive for the flexible package lithium ion is beneficial to improving the rate performance of the flexible package battery.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect among the prior art, the embodiment of the utility model provides a utmost point ear for lithium cell, its heat dispersion that is used for improving utmost point ear by a wide margin.

The embodiment of the application discloses: the utility model provides a utmost point ear for lithium cell for be connected with the electrode of lithium cell, includes a plurality of utmost point auricles and at least one separator, utmost point auricles are including the first portion and the second portion that meet, and is a plurality of utmost point auricles pass through respectively first portion is connected in order to form a encapsulation portion, the one end of encapsulation portion with the electrode is connected, the parcel has the white glue on the other end of encapsulation portion, the separator sets up adjacent two so that adjacent two between the second portion of utmost point auricle the second portion interval sets up to make adjacent two form hollow structure between the second portion.

Specifically, the thickness of the pole ear piece is between 0.5 mm and 2.5 mm.

Specifically, the second portions of the plurality of pole tabs are parallel to each other.

Specifically, the isolation piece is integrated into one piece's metal sheet, the metal sheet has a plurality of portions of bending, the metal sheet is through a plurality of the portion of bending supports two adjacent second portions.

Specifically, the spacer is made of aluminum alloy.

Specifically, the spacers are welded or riveted to the two corresponding second portions, respectively.

Specifically, the section of the bending part is trapezoidal.

Specifically, the first portions of the plurality of pole ear pieces are connected by welding.

Specifically, the width of the pole tab is equal to the width of the electrode.

The utility model discloses following beneficial effect has at least: the lug for the lithium battery in the embodiment is provided with a plurality of pole lug pieces which are arranged in a stacked mode, and a hollow structure is formed between the plurality of pole lug pieces, so that the surface area of the lug can be increased in a limited space in the existing design in a double mode, and the heat dissipation capacity of the lug is equal to the product of the convective heat transfer coefficient, the temperature difference and the surface area of the temperature difference, so that the heat dissipation capacity of the lug can be greatly improved after the surface area of the lug is increased in a double mode, and therefore the performance of the lithium battery can be greatly improved. In addition, because the hollow structure is arranged between the two adjacent pole lug plates, when cooling air passes through the space between the two adjacent pole lug plates, the cooling of the pole lugs can be accelerated, the temperature difference between the pole lugs and the lithium battery can be increased, and the heat dissipation capacity is further improved.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view illustrating a tab for a lithium battery connected to an electrode according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken at C-C of FIG. 1;

fig. 3 is a partially enlarged view at D in fig. 2.

Reference numerals of the above figures: 1. an electrode; 2. a tab for a lithium battery; 2', a tab for a lithium battery; 21. a polar tab; 211. a first part; 212. a second section; 22. a spacer; 221. a bending part; 3. and (5) white glue.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 to 3, the tab 2 (2') for a lithium battery in the present embodiment is used for connecting with the electrode 1 of the lithium battery, and specifically, two tabs are generally used to connect to the electrode 1, and the two tabs respectively constitute a positive tab and a negative tab of the electrode 1.

Referring to fig. 3 with emphasis on the description, the tab 2 (2') for a lithium battery in the present embodiment includes a plurality of tab pieces 21 and at least one separator 22, and theoretically, when the number of tab pieces 21 of one tab is N (N is a natural number, and N ≧ 2), the number of separators 22 is N-1. The pole ear pieces 21 comprise a first part 211 and a second part 212 which are connected, the pole ear pieces 21 are respectively connected through the first part 211 to form a packaging part, one end of the packaging part is connected with the electrode 1, and the other end of the packaging part is wrapped with white glue 3 for insulation and leakage prevention. The spacers 22 are disposed between the second portions 212 of two adjacent pole tabs 21, such that two adjacent second portions 212 are spaced apart and such that a hollow structure is formed between two adjacent second portions 212. That is, the spacers 22 are used to prevent the second portions 212 of two adjacent pole tabs 21 from contacting each other, and each spacer 22 and the two corresponding pole tabs do not form a solid structure therebetween, and a hollow structure for cooling air to flow through is formed therebetween. Preferably, the areas of the second portions 212 of the plurality of pole tabs 21 are substantially the same.

By means of the structure, the tab 2 (2') for the lithium battery in the embodiment has the advantages that the multiple tab pieces 21 are stacked, and the hollow structure is formed among the multiple tab pieces 21, so that the surface area of the tab can be increased in a limited space in the existing design in a multiple manner, and the heat dissipation capacity of the tab is equal to the product of the convective heat transfer coefficient, the temperature difference and the surface area of the temperature difference, so that the heat dissipation capacity of the tab can be greatly improved after the surface area of the tab is increased in a multiple manner, and the performance of the lithium battery can be greatly improved. In addition, because the two adjacent pole lug plates 21 are of a hollow structure, when cooling air passes through the two adjacent pole lug plates 21, the cooling of the pole lugs can be accelerated, the temperature difference between the pole lugs and the lithium battery can be increased, and the heat dissipation capacity is further improved.

Specifically, the thickness of the pole tab 21 is between 0.5 mm and 2.5 mm. As shown in fig. 2, the second portions 212 of the plurality of pole tabs 21 are parallel to each other.

Specifically, as shown in fig. 2 and 3, the spacer 22 may be a metal plate formed integrally. The metal plate has a plurality of bent portions 221, and the metal plate supports the second portions 212 of the two adjacent pole tab pieces 21 by the plurality of bent portions 221. Preferably, the cross section of the bending portion 221 is trapezoidal, so that a certain area can be ensured between the bending portion 221 and the contact surfaces of the upper and lower second portions 212, and stress concentration caused by an excessively small contact area is avoided. The spacers 22 may be made of aluminum alloy, so that the spacers 22 also have a certain thermal conductivity, further improving the heat dissipation capability of the tab. Further, the spacers 22 and the two corresponding second portions 212 may be connected by welding or riveting to ensure the structural stability of the tab.

Specifically, as shown in fig. 1, the width of the pole tab 21 is as equal as possible to the width of the electrode 1, in other words, both sides of the pole tab 21 are aligned as much as possible with both sides of the electrode 1. In this way, the area of the second portion 212 of the pole tab 21 can be increased as much as possible in a limited space, which is beneficial to heat dissipation of the pole tab 21.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. The utility model provides a utmost point ear for lithium cell for with electrode connection of lithium cell, its characterized in that includes a plurality of utmost point auricles and at least one separator, utmost point auricles are including the first portion and the second portion that meet, and is a plurality of utmost point auricles pass through respectively first portion is connected in order to form a encapsulation portion, the one end of encapsulation portion with electrode connection, the parcel has the white glue on the other end of encapsulation portion, the separator sets up two adjacent between the second portion of utmost point auricle so that adjacent two second portion interval sets up to make adjacent two form hollow structure between the second portion.

2. The tab for a lithium battery as claimed in claim 1, wherein the thickness of the tab piece is between 0.5 mm and 2.5 mm.

3. The tab for a lithium battery as claimed in claim 1, wherein the second portions of the plurality of tab pieces are parallel to each other.

4. The tab for lithium batteries as claimed in claim 1, wherein the separator is an integrally formed metal plate, and the metal plate has a plurality of bent portions thereon, and the metal plate supports two adjacent second portions through the plurality of bent portions.

5. The tab for lithium batteries as claimed in claim 1, wherein the separator is made of aluminum alloy.

6. The tab for a lithium battery as claimed in claim 4, wherein the separators are welded or riveted to the corresponding two second portions, respectively.

7. The tab for a lithium battery as claimed in claim 4, wherein the bent portion has a trapezoidal cross section.

8. The tab for a lithium battery as claimed in claim 1, wherein the first portions of the plurality of tab pieces are connected by welding.

9. The tab for a lithium battery as claimed in claim 1, wherein the width of the tab piece is equal to the width of the electrode.