Tab metal conductor structure for improving sealing performance of soft package lithium ion battery

Abstract

The invention is suitable for the field of lithium ion batteries, and provides a tab metal conductor structure for improving the sealing performance of a soft package lithium ion battery, the surface of a metal conductor is divided into a rubberizing area and a non-rubberizing area, the surface of the metal conductor in the rubberizing area is processed to be in inward inclined step arrangement, and steps are uniformly distributed in the rubberizing area. By changing the surface structure of the metal conductor in the tab rubberizing area, the traditional surface smooth structure is changed into the step arrangement which is inclined inwards, so that the risk of liquid leakage between the metal conductor and the tab rubber is remarkably reduced. During heat sealing, the tab glue is embedded in the concave part of the step, so that the adhesive force of the tab glue on the metal conductor is increased; the protruding inner inclined steps block the leakage path of the electrolyte; and a Z-shaped interface formed between the tab glue and the metal conductor increases the total outward penetration distance of the electrolyte. In general, due to the structure, the adhesive force of the tab glue is improved, and the electrolyte penetration resistance of two interfaces is improved, so that the sealing property of the soft package lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a tab metal conductor structure for improving the sealing performance of a soft-pack lithium-ion battery. Background technique [0002] With the continuous improvement of energy density requirements, various manufacturers are striving to improve the parameters of their own products, mainly along two and a half routes: one is to step up the development of high specific energy cathode materials, and the other is to increase the capacity of battery cells , to reduce the proportion of auxiliary structures such as shells in the monomer. [0003] The aluminum-plastic film has a large space for deformation. In the event of a safety hazard, the pouch battery will only blow up and crack at most, unlike steel-cased and aluminum-cased cells that will explode when thermal runaway occurs, reducing the risk of explosion. In terms of structure, pouch batteries have good safety ...

AI Technical Summary

Problems solved by technology

[0005] An embodiment of the present invention provides a tab metal conductor structure that improves the sealing performance of a soft-packed lithium-ion battery, aiming to solve the problem of difficult bonding between the metal conductor and the tab glue, weak adhesion, and both problems in the prior art. High risk of electrolyte penetration between contact surfaces

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