Pole lug packing structure and soft-packing battery

Abstract

The invention relates to the field of energy storage devices and particularly relates to a pole lug packing structure and a soft-packing battery. The pole lug packing structure comprises a pole lug piece and two pole lug rubber layers, wherein the pole lug piece comprises two main planes, the two pole lug rubber layers extend along the width direction and are symmetrically adhered to the two main planes, the two ends of the two pole lug rubber layers are adhered together, each of the pole lug rubber layers comprises an area A and an area B along the length direction, wherein the areas A are closer to the outer side than the areas B, and the areas B exceed the areas A along the direction vertical to the main planes, so that grooves are formed between the areas A and the areas B. The soft-packing battery comprises a packing bag and a pole lug packing structure, the pole lug piece passes through the edge of the packing bag, the inner side of the pole lug piece is positioned inside the packing bag, the outer side of the pole lug piece is positioned outside the packing bag, the edge of the packing bag is connected with the areas A and the areas B through heat sealing to form a sealing structure, wherein the compression of the areas A is larger than that of the areas B. The soft-packing battery provided by the embodiment can be used for effectively improving the problem of stress concentration so as to inhibit the over-low side resistance.

Description

technical field [0001] The present application relates to the field of energy storage devices, in particular to a tab packaging structure and a pouch battery. Background technique [0002] In the related technology, when the soft pack battery is packaged, the tab glue is generally spread on the tab piece. When it is heat-sealed with the aluminum-plastic film packaging bag, the PP layer and the tab glue inside the aluminum-plastic film melt at the same time, and the upper and lower heads are sealed. Pressure is generated, and the melted PP glue is squeezed to both sides. After cooling, there will be overflowing strips on the inner and outer sides of the seal. Due to uneven pressure, uneven thickness of the PP layer on the inner side of the ear glue and the packaging tape, and the surface is not smooth. , It often leads to unevenness of the overflowing rubber strip, and a large overflowing rubber block will be generated somewhere, and the overflowing rubber block will harden a...

AI Technical Summary

Problems solved by technology

[0002] In the related technology, when the soft pack battery is packaged, the tab glue is generally spread on the tab piece. When it is heat-sealed with the aluminum-plastic film packaging bag, the PP layer and the tab glue inside the aluminum-plastic film melt at the same time, and the upper and lower heads are sealed. Pressure is generated, and the melted PP glue is squeezed to both sides. After cooling, there will be overflowing strips on the inner and outer sides of the seal. Due to uneven pressure, uneven thickness of the PP layer on the inner side of the ear glue and the packaging tape, and the surface is not smooth. , often lead to unevenness of the overflowing rubber strip, and a large overflowing rubber block will be generated somewhere, and the overflowing rubber block will harden after cooling

[0003] In the process of battery production, transfer, assembly, etc., and when the battery vibrates on the whole vehicle after loading, the packaging will be deformed to varying degrees, and stress concentration will occur at the large overflow rubber block, which belongs to the weak area. It is easy to tear here, if it happens on the inside of the seal, the electrolyte will seep into the middle metal layer (aluminum layer or steel layer) of the packaging bag to contact, creating ion channels, resulting in a decrease in edge resistance

[0004] The main hazards of low side resistance are: a. The exposed metal layer (aluminum layer or steel layer) of the battery packaging bag (aluminum-plastic film or steel-plastic film) is easy to contact with the outside world to cause leakage; b. The metal layer of the packaging bag (aluminum layer or steel layer) corrodes in contact with the electrolyte, and leakage will occur after a long time

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