Production method and encapsulating shell of lithium ion battery

Abstract

The invention relates to a production method of a lithium ion battery, which comprises the following steps: a battery cell is installed in an encapsulating shell and an opening at one end of a hollow tube is arranged in the encapsulating shell while an opening at the other end thereof is arranged outside the encapsulating shell which is sealed at the periphery and communicated with the outside through the hollow tube; vacuumization: the encapsulating shell is connected with vacuumization equipment for vacuumizing through the hollow tube; electrolyte is added and set aside; formation and vacuumization; the battery is sealed to obtain the finished product of the lithium ion battery. The invention has simple production process, does not require such expensive equipment with low universality as filling equipment, moistening equipment and the like, and can avoid the corrosion of a battery shell by the electrolyte and improve battery performance.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a manufacturing method of a lithium ion battery and an encapsulation case of the lithium ion battery. Background technique [0002] Since the successful development of lithium-ion batteries in the 1990s, due to their unique advantages such as high energy, long cycle life, high working voltage, and no pollution, they have been widely used in mobile phones, digital cameras, notebook computers and other electronic devices. Electric appliances, and gradually expand to the application fields of large-capacity power lithium-ion batteries such as electric bicycles, electric vehicles, and backup power supplies. Lithium-ion batteries can be divided into two types according to the packaging form of the battery case, one is hard-shell lithium-ion batteries, usually packed in steel shells, aluminum shells, and plastic shells; the other is soft-packed lithium-ion batteries, usually packed...

AI Technical Summary

Problems solved by technology

Chinese patent 200720121914.9 invented a rubber ring for lithium-ion battery manufacturing process, which can reduce the production cost of battery production and improve the performance of the battery, but this method still cannot completely prevent the battery material from contacting the moisture in the air, electrolysis Liquid may still corrode the battery case, leaving white spots

[0017] On the other hand, part of the harmful gas generated during the formation will stay inside the battery, which will also damage the performance of the battery

Chinese patent 02134461.2 has improved the traditional manufacturing process and provided a lithium-ion battery opening positive pressure formation method, but it still cannot completely prevent the battery material from contacting the moisture in the air, and the exhaust is not thorough, so that it affects the battery. performance

[0018] Therefore, using traditional methods to manufacture lithium-ion batteries has the following problems: one is high environmental requirements during liquid injection, difficulty in battery liquid injection, and poor wetting effect; or high-absorbency filter paper, etc., so that the outside air enters the inside of the battery and damages the performance of the battery; the third is that part of the harmful gas generated during the formation will stay inside the battery and damage the performance of the battery; the fourth is the electrolyte during the formation. It is easy to overflow from the liquid injection hole with the generated gas, corrode the battery case, affect the appearance, and need to be cleaned and polished

Images