CN218568923U

CN218568923U - Soft package lithium ion battery

Info

Publication number: CN218568923U
Application number: CN202222200823.1U
Authority: CN
Inventors: 朱剑峰; 刘东凤; 沈立强; 曾贤华
Original assignee: Huizhou Everpower Technology Co ltd
Current assignee: Huizhou Everpower Technology Co ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2023-03-03
Anticipated expiration: 2032-08-19

Abstract

The utility model discloses a soft package lithium ion battery, which comprises a tab and an aluminum plastic film, wherein the tab comprises a nickel strap, an aluminum strap and tab glue, the nickel strap is welded on the aluminum strap, the tab glue is coated on the welding positions of the nickel strap and the aluminum strap, and the length of the nickel strap at the welding positions is equal to that of the aluminum strap; and the welding positions of the nickel strap and the aluminum strap are packaged on the aluminum-plastic film. The utility model relates to a soft packet of lithium ion battery, through setting up welding position department the length of nickel strap with the length of aluminium strip equals and will the nickel strap with aluminium strip welding position encapsulate in on the plastic-aluminum membrane to can be so that aluminium nickel utmost point ear overlap position buckle difficult fracture, guarantee the intensity of buckling, need not manage and control the solder joint height during the encapsulation, reduce the whole goodness of solder joint height harmfully improvement that causes because of the processing procedure is undulant, can improve the security and the reliability of battery simultaneously.

Description

Soft package lithium ion battery

Technical Field

The utility model relates to a laminate polymer battery field especially relates to a laminate polymer lithium ion battery.

Background

In the existing soft package lithium ion battery, a height difference exists at the connecting position of an aluminum-to-nickel tab, the packaging of the anode tab and an aluminum plastic film is basically in a hard packaging mode, and after the packaging is finished, the aluminum-to-nickel welding point of the tab is required to be outside the packaging. And the problem that the aluminum strip of the bent tab is easy to break during assembly operation, the nickel strip at the overlapped position of the bent aluminum-nickel conversion easily punctures the tab glue and the battery, so that the battery leakage or internal short circuit is caused, the safety and reliability of the battery are reduced, the consistency of the exposed height of the tab welding spot is poor during packaging, and the size of the battery and the customer assembly are influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the weak point among the prior art, provide a soft packet of lithium ion battery.

The purpose of the utility model is realized through the following technical scheme:

a soft pack lithium ion battery comprising: a tab and an aluminum-plastic film,

the tab comprises a nickel strip, an aluminum strip and tab glue, the nickel strip is welded on the aluminum strip, the tab glue is coated at the welding position of the nickel strip and the aluminum strip, and the length of the nickel strip at the welding position is equal to that of the aluminum strip;

and the welding positions of the nickel strap and the aluminum strap are packaged on the aluminum-plastic film.

Preferably, the welding position of the nickel strap and the aluminum strap is encapsulated outside the aluminum-plastic film.

Preferably, the welding positions of the nickel strap and the aluminum strap are encapsulated in the aluminum-plastic film.

Preferably, the tab sealing structure further comprises a sealing head, and the sealing head is used for packaging the tab on the aluminum plastic film.

Preferably, the width of the welding position of the nickel strip and the aluminum strip is equal to or larger than the width of the seal head.

Preferably, the nickel strap and the aluminum strap are welded by laser welding or resistance welding.

Preferably, the nickel strap and the aluminum strap are provided with a plurality of welding spots, and the welding spots are arranged in a rectangular matrix.

Preferably, the tab is packaged on the aluminum plastic film in a hard packaging manner.

Preferably, the tab glue comprises an upper glue layer and a lower glue layer, the upper glue layer is attached to one side, away from the nickel strap, of the aluminum strap, and the lower glue layer is attached to one side, away from the aluminum strap, of the nickel strap.

Preferably, the upper adhesive layer and the lower adhesive layer have the same thickness.

The utility model discloses compare in prior art's advantage and beneficial effect as follows:

the utility model relates to a soft packet of lithium ion battery, through setting up welding position department the length of nickel strap with the length of aluminium strip equals and will the nickel strap with aluminium strip welding position encapsulate in on the plastic-aluminum membrane to can make aluminium nickel utmost point ear overlap position buckle difficult fracture, guarantee the intensity of buckling, need not manage and control the solder joint height during the encapsulation, reduce the solder joint height harmfully that causes because of the processing procedure is whole goodness, can improve the security and the reliability of battery simultaneously.

The utility model also sets the width of the welding position of the nickel strip and the aluminum strip equal to or larger than the width of the end socket, namely the size of the overlapping position of the aluminum-nickel tab is consistent with or larger than the width of the end socket, so that the packaging is more convenient, and the packaged nickel strip and aluminum strip are more firm; meanwhile, the aluminum-nickel connection overlapping position is covered with the tab glue on the surface to keep the thickness consistent, so that the welding operation is convenient, the welding efficiency can be improved, and the yield of the soft package battery is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a soft package lithium ion battery according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a tab of the soft package lithium ion battery shown in fig. 1.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Referring to fig. 1 to fig. 2, a soft package lithium ion battery includes: the tab 100 comprises a nickel strap 110, an aluminum strap 120 and a tab glue 130, the nickel strap is welded on the aluminum strap, the tab glue is coated at the welding position 140 of the nickel strap and the aluminum strap, and the length of the nickel strap at the welding position is equal to that of the aluminum strap; and the welding positions of the nickel strap and the aluminum strap are packaged on the aluminum-plastic film.

So, through setting up welding position department the length of nickel strap with the length of aluminium strip equals and will the nickel strap with aluminium strip welding position encapsulate in on the aluminium-plastic membrane to can make aluminium-nickel utmost point ear overlap the position and buckle difficult fracture, guarantee the intensity of buckling, need not manage and control the solder joint height during the encapsulation, reduce the solder joint height harmfully because of the process fluctuation causes and improve whole goodness, can improve the security and the reliability of battery simultaneously.

The welding position of the nickel strap and the aluminum strap is encapsulated outside the aluminum-plastic film. And the welding positions of the nickel strap and the aluminum strap are encapsulated in the aluminum plastic film. Therefore, the aluminum-nickel overlapping position can be outside the battery and also can be in the package, and the bending strength of the lug is improved.

The tab sealing structure further comprises a sealing head, wherein the sealing head is used for packaging the tab on the aluminum plastic film. Further, the width of the welding position of the nickel strip and the aluminum strip is equal to or larger than that of the seal head. The size of the overlapping position of the aluminum-nickel tab is consistent with or larger than the width of the end socket (1.0-5.0 mm), and the size of the overlapping position of the end socket and the tab is defined during packaging; therefore, the width of the welding position of the nickel strip and the aluminum strip is equal to or larger than the width of the end enclosure, namely the size of the overlapping position of the aluminum-nickel tab is consistent with or larger than the width of the end enclosure, so that the packaging is more convenient, and the packaged nickel strip and aluminum strip are more firm; meanwhile, the aluminum-nickel connection overlapping position is covered with the tab glue on the surface to keep the thickness consistent, so that the welding operation is convenient, the welding efficiency can be improved, and the yield of the soft package battery is ensured.

In this embodiment, the nickel strap and the aluminum strap are welded by laser welding or resistance welding. The nickel strap and the aluminum strap are provided with a plurality of welding spots, and the welding spots are arranged in a rectangular matrix. And the pole lugs are packaged on the aluminum plastic film in a hard packaging mode. Thus, the reliability of the battery package can be improved, and the safety of the battery can be improved.

Referring to fig. 2, the tab glue 130 includes an upper glue layer 131 attached to a side of the aluminum strip away from the nickel strip and a lower glue layer 132 attached to a side of the nickel strip away from the aluminum strip. Further, the thickness of the upper glue layer is equal to that of the lower glue layer. So, can make the aluminium nickel connect and overlap position surface covering utmost point ear glue and guarantee that thickness is unanimous, and then conveniently weld and improve the battery yields.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A soft-pack lithium ion battery, comprising: a tab and an aluminum-plastic film,

2. The soft-package lithium ion battery of claim 1, wherein the nickel strap and the aluminum strap are encapsulated outside the aluminum-plastic film at a welded location.

3. The soft package lithium ion battery of claim 1, wherein the nickel strap and the aluminum strap are encapsulated in the aluminum plastic film at a welded location.

4. The soft package lithium ion battery of claim 2 or 3, further comprising a sealing head, wherein the sealing head is used for packaging a tab on the aluminum plastic film.

5. The soft package lithium ion battery of claim 4, wherein the width of the welding position of the nickel strip and the aluminum strip is equal to or greater than the width of the seal head.

6. The soft-packed lithium ion battery according to claim 1, wherein the nickel strip and the aluminum strip are welded by laser welding or resistance welding.

7. The soft-package lithium ion battery according to claim 1, wherein the nickel strip and the aluminum strip are provided with a plurality of welding spots, and the welding spots are arranged in a rectangular matrix.

8. The soft package lithium ion battery of claim 1, wherein the tab is packaged on the aluminum plastic film by means of hard packaging.

9. The soft package lithium ion battery of claim 1, wherein the tab glue comprises an upper glue layer and a lower glue layer, the upper glue layer is attached to one side of the aluminum strip away from the nickel strip, and the lower glue layer is attached to one side of the nickel strip away from the aluminum strip.

10. The soft-pack lithium ion battery of claim 9, wherein the upper and lower adhesive layers are of equal thickness.