Plastic-aluminum film packed cylindrical lithium ion battery and making method thereof

Abstract

The invention relates to the lithium ion battery technical field, and discloses a plastic-aluminum film packed cylindrical lithium ion battery which comprises a cylindrical electric core, a plastic-aluminum film bag, a positive electrode lug and a negative electrode lug; one of the positive electrode lug and the negative electrode lug is provided with two electrode lug glues, namely a first electrode lug glue and a second electrode lug glue, the other electrode lug is provided with an electrode lug glue, namely a third electrode lug glue; the second electrode lug glue and the third electrode lug glue are respectively thermally melted with the plastic-aluminum film bag for formation of two end sealed edges, and an airbag is arranged between the first electrode lug glue and one of the end sealed edges. According to the plastic-aluminum film packed cylindrical lithium ion battery, one electrode lug provided with the two electrode lug glues is used, so that the positive electrode lug and the negative electrode lug are respectively located at both ends of the electric core, at the same time, the airbag is located at one end of the electric core, the design and manufacture flexibility of the plastic-aluminum film packed cylindrical lithium ion battery is greatly improved, the injection speed of electrolyte into the electric core is improved, plastic-aluminum film scouring pit process is reduced; the production cost is saved, and the risk of plastic-aluminum film air leakage caused by scouring pit can be avoided.

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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