Cylindrical lithium-ion battery packaged in aluminum-plastic film and manufacturing method thereof

Abstract

The invention relates to the technical field of lithium-ion batteries, and discloses a cylindrical lithium-ion battery packaged in aluminum-plastic film, which includes a cylindrical battery cell, an aluminum-plastic film bag, a positive ear, a negative ear, and one of the positive ear and the negative ear. There are two ear glues on the top, that is, the first ear glue and the second ear glue, and there is one ear glue on the other ear, that is, the third ear glue, the second ear glue, and the third pole ear glue. The ear gels are respectively thermally melted with the aluminum-plastic film bag to form two edge seals, and an air bag is provided between the first ear gel and one of the end seals. The invention adopts two tabs of tab glue, so that the positive and negative tabs are respectively located at both ends of the battery cell, and at the same time the air bag is located at one end of the battery cell, which greatly improves the efficiency of aluminum-plastic film packaging of cylindrical lithium-ion batteries. Flexibility in design and production; increase the speed of electrolyte injection into the cell; reduce the aluminum-plastic film punching process, save production costs, and avoid the risk of aluminum-plastic film leakage caused by punching.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a cylindrical lithium-ion battery packaged in aluminum-plastic film made of tabs with two tab glues. Background technique [0002] Cylindrical lithium-ion batteries with stainless steel shells are widely used due to their high capacity, good battery consistency, and long cycle life. However, stainless steel is used as the shell. On the one hand, the size of the stainless steel shell directly limits the size of the battery cell, which greatly reduces the flexibility of battery production; discharge, or need to pay a lot of cost to discharge the gas generated during the formation and aging process. Therefore, the battery factory produces cylindrical lithium-ion batteries with stainless steel shells, usually using a closed-end formation process, so that the gas generated during the formation and aging process The gas is stored in the battery, and the internal pressure...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a cylindrical lithium-ion battery packaged with aluminum-plastic film and its manufacturing method, so as to solve the unreasonable setting of the air bag position of the cylindrical lithium-ion battery packaged with aluminum-plastic film, and the need to punch holes in the aluminum-plastic film package, electrolyze Difficulties in liquid injection and problems affecting the size design of lithium-ion electronics

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