Negative pressure ageing method of lithium ion battery

Abstract

The invention discloses a negative pressure ageing method of a lithium ion battery, which can preferably eliminate the ballooning of the lithium ion battery and ensure normal thickness index and safety use of the battery. The method comprises the following steps: carrying out formation on the battery; placing the battery in a vacuum tank for carrying out opening negative pressure ageing for 10 hours; and reforming and sealing the battery. A battery production method is designed independently and has independent core intellectual property. The method provided by the invention is used to ensure the thickness index, normal cycling performance and stability of the battery, and is applied to the production field of the lithium ion batteries.

Description

technical field [0001] The invention relates to a production method of a lithium ion secondary battery, and more particularly, to a negative pressure aging method of a lithium ion battery. Background technique [0002] In the prior art, in the production process of lithium ion batteries, the problem of gas swelling of lithium ion batteries is a bad phenomenon that often occurs in the production process, and the reasons for battery gas swelling are very many and complex. In particular, lithium ion secondary batteries using lithium manganate as the main material are more prone to gas swelling during the production process. This problem has always plagued many production fields of lithium ion batteries, because lithium manganate is the main material. Compared with lithium cobalt oxide materials, it is easier to generate gas in the process of electrochemical reaction of lithium-ion batteries, so special technical solutions are needed to solve this problem. In the current product...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, in the production process of lithium-ion batteries, the gas swelling problem of lithium-ion batteries is a bad phenomenon that often occurs in the manufacturing process, and there are many reasons for battery gas swelling, which are also relatively complicated.

In particular, lithium-ion secondary batteries using lithium manganate as the main material are more prone to gas swelling during the manufacturing process. This problem has been plagued by many lithium-ion battery production fields, because lithium manganate is the main material. Lithium-ion batteries, in the process of electrochemical reaction, are more likely to generate gas than lithium cobalt oxide materials, so special technical solutions need to be adopted to solve this problem. In the current production process, vacuuming is carried out immediately after the battery is formed. Plastic sealing and other processes, so that the gas generated during the aging process will be trapped inside the battery and cause the battery to swell, so the pass rate of the product in the manufacturing process is low, because the battery thickness exceeds the standard due to the bloating problem