Tab and method for manufacturing same and lithium ion battery comprising the tab

Abstract

The invention relates to a pole ear, its manufacturing method and the lithium ion battery including the pole ear. Among them, the said pole ear includes the pole ear slide, in which the pole ear also includes the hot melt adhesive membrane, and the hot melt adhesive membrane directly hot pressing the outer surface of the pole ear slide. Among them, the said battery pole ear manufacturing method includes the following steps: according to the pole ear slide size, intercepting the hot melt adhesive membrane size; using two hot melt adhesive membranes clamping the pole ear slide; using heating module to heat up-and-down the hot melt adhesive membrane clamping the pole ear slide; cooling the pole ear slide after hot pressing. This invention provides the pole ear, and since the hot melt adhesive membrane can be firmly attached the pole ear slide together, and two hot melt adhesive membranes integrate together after hot melt, and form to a sealing plastic slide after cooling, it ensures the insulation of the pole ear slide, effectively avoid the original short circuit caused by the adhesive plaster's broken or fallen, and then cause the battery fever, swell, or even explosion, so it greatly enhanced the safety performance of the lithium ion battery.

Description

technical field [0001] The invention relates to a tab, a manufacturing method thereof and a lithium ion battery comprising the tab. Background technique [0002] At present, the insulation device used as the tab of the lithium-ion battery is mainly adhesive tape. However, the tape itself has two defects: 1. The toughness is not enough, and it is easily scratched by the burrs on the edge of the tab, causing a short circuit in the contact between the tab and the shell; 2. The electrolyte soaks the tape for a long time, causing the tape to fall off from the tab. Cause a short circuit in the contact between the tab and the shell. This causes safety problems such as heating, drumming, and even explosion of the battery. [0003] CN1540785A discloses a method for making soft-packed lithium-ion battery tabs. On the metal pole piece at the heat-sealing position of the aluminum-plastic composite film, an aluminum foil with an outer hot-melt adhesive film is pasted with an adhesive t...

AI Technical Summary

Problems solved by technology

However, the tape itself has two defects: 1. The toughness is not enough, and it is easily scratched by the burrs on the edge of the tab, causing a short circuit in the contact between the tab and the shell; 2. The electrolyte soaks the tape for a long time, causing the tape to fall off from the tab. Cause a short circuit in the contact between the tab and the shell

The purpose of the invention of CN1540785A is to prevent the battery electrolyte from leaking out due to the problem of poor adhesion when the positive and negative metal tabs are heat-bonded with the aluminum-plastic composite film during the manufacture of the flexible-packaged lithium-ion battery, rather than heat-fused The adhesive film is directly heat-sealed on the tab to protect the insulation of the tab, and there is also a problem of cohesion when bonding with an adhesive

For the tabs of lithium-ion batteries, there is a problem that the tabs are easy to contact with the shell and cause a short circuit, which poses a safety hazard.

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