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Tab having special-shaped tab film, preparation method thereof and lithium ion battery

A lithium-ion battery and electrode ear glue technology, which is applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of battery safety risks, increased hardness of side sealing edges, and core extrusion, and achieves high accuracy. High, improve package reliability, precise die-cutting effect

Pending Publication Date: 2019-09-20
东莞市恒源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of satisfying the limit design, that is, the tab needs to be set as close to the edge of the cell as possible. At this time, the tab glue in the exposed area will participate in the side sealing of the aluminum-plastic film, making the side sealing edge harder , when the side sealing edge is folded inward, the folded angle formed will squeeze the winding core, resulting in a certain safety risk for the battery

Method used

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  • Tab having special-shaped tab film, preparation method thereof and lithium ion battery
  • Tab having special-shaped tab film, preparation method thereof and lithium ion battery
  • Tab having special-shaped tab film, preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, a tab with special-shaped tab glue includes a metal strip 1 and special-shaped tab glue 2 symmetrically arranged on both surfaces of the metal strip 1. The special-shaped tab glue 2 includes an integrally formed first colloid part 21 and a second Two colloidal parts 22, the length of the first colloidal part 21 is greater than the length of the second colloidal part 22, the first colloidal part 21 and the second colloidal part 22 both have an end aligned setting, the first colloidal part 21 and the second colloidal part A gap 23 is formed between the 22. The metal strip 1 includes any one of nickel strip, aluminum strip, copper strip and aluminum-nickel strip.

[0039] The preparation method of the tab with special-shaped tab glue in this embodiment includes the following steps:

[0040] 1) Unwind N metal strips first, then position the N metal strips, and then preheat the N metal strips;

[0041] 2) Attach the square ear glue to the two si...

Embodiment 2

[0046] Such as figure 2 As shown, the difference from Embodiment 1 is that in this embodiment, a rounded corner structure 24 is provided at the transition connection between the first glue part 21 and the second glue part 22 of the special-shaped tab glue.

[0047] In the method for preparing a tab with special-shaped tab glue in this embodiment, in step 4), while the notch is obtained by die-cutting, the inner corner where the notch is located is also rounded. That is, a rounded corner structure is formed at the transition connection between the first colloidal part and the second colloidal part.

[0048] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0050] Such as image 3 As shown, a tab with special-shaped tab glue includes a metal strip 1 and special-shaped tab glue 2 symmetrically arranged on both surfaces of the metal strip 1. The special-shaped tab glue 2 includes an integrally formed first colloid part 21 and a second Two colloid parts 22, the length of the first colloid part 21 is greater than the length of the second colloid part 22, the centers of the first colloid part 21 and the second colloid part 22 are on the same straight line, the first colloid part 21 and the second colloid part Two notches 23 are formed between the portions 22 . The metal strip 1 includes any one of nickel strip, aluminum strip, copper strip and aluminum-nickel strip.

[0051] The preparation method of the tab with special-shaped tab glue in this embodiment includes the following steps:

[0052] 1) Unwind N metal strips first, then position the N metal strips, and then preheat the N metal strips;

[0053] 2) Attach the square ear glu...

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Abstract

The invention belongs to the technical field of a battery and especially relates to a tab having a special-shaped tab film. The tab having the special-shaped tab film comprises a metal tape and the special-shaped tab film arranged on the two surfaces of the metal tape. The special-shaped tab film comprises a first film portion and a second film portion, which are integrated. The length of the first film portion is larger than the length of the second film portion; and at least one gap is formed between the first film portion and the second film portion. Compared with the prior art, under the condition where the tab meets a limit design, the inner exposed portion of the special-shaped tab film of the tab does not participate in side sealing process of a battery, thereby helping to improve package reliability and safety of an electrical core. Besides, the invention also relates to a preparation method of the tab having the special-shaped tab film and the lithium ion battery comprising the tab.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a tab with special-shaped tab glue, a preparation method thereof, and a lithium ion battery. Background technique [0002] Soft-pack lithium-ion batteries have been widely used in digital / power batteries. Compared with steel-aluminum shell batteries, they have advantages in energy density and customization, but their safety and reliability have always been concerned by the industry. [0003] The flexible packaging lithium-ion battery industry generally adopts the process of winding or stacking the positive electrode sheet, separator, and negative electrode sheet in sequence to form a battery cell. The positive electrode sheet leads to a positive electrode tab, and the negative electrode sheet leads to a negative electrode tab; The film wraps the cell inside and performs top sealing and side sealing processes, and finally the side sealing edge is folded inward to for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M10/0525
CPCH01M10/0525H01M50/531Y02E60/10
Inventor 黄运兴
Owner 东莞市恒源新材料有限公司
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