Formation technology of lithium ion batteries

Abstract

The invention discloses formation technology of lithium ion batteries. The technology comprises the following steps: first liquid injection is carried out for 80-90% of a semi-finished product battery, and a first pretreated battery is obtained; the first pretreated battery is permitted to stand for 10-14 hours at room temperature, and a second pretreated battery is obtained; the second pretreated battery is transferred to a baking oven at 45 DEG C for 4-8 hours, and a third pretreated battery is obtained; formation is carried out for the third pretreated battery in a condition with a negative pressure at 45 DEG C, wherein the negative pressure is 80-90kpa, formation time is 3 hours, and a fourth pretreated battery is obtained; a forth pretreated battery is transferred to a baking oven at 45 DEG C for 10-14 hours, and a fifth pretreated battery is obtained; secondary liquid injection is carried out for 10-20% of a fifth pretreated battery, and a sixth pretreated battery is obtained; a capacity grading test is carried out for a six pretreated battery, and a battery is obtained. The formation technology of lithium ion batteries solves the problem that gas is generated in the prior formation technology of lithium ion batteries; swelling of batteries is controlled, reaction interfaces are optimized, and performance of batteries is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium-ion battery formation process. Background technique [0002] Due to the high specific energy and high specific power characteristics of lithium-ion batteries, whether it is a hybrid electric vehicle that requires a high specific power battery, a plug-in hybrid electric vehicle that requires a battery with both energy and power, or a pure battery that requires a high specific energy battery Electric vehicles are the most ideal choice at present. Therefore, power lithium-ion batteries have become the key technology and core industry in the implementation of new energy vehicle plans, and more and more car manufacturers choose to use lithium-ion batteries as power batteries for electric vehicles. [0003] Formation is an important process in the production process of lithium batteries. During formation, a passivation layer is formed on the surface of the negative electro...

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Problems solved by technology

[0004] At present, the actual process is as follows: after the battery is filled with liquid, let it stand at room temperature for 24 hours, and then stand at 45°C for 24 hours, then form it at room temperature, and then leave it at 45°C for 24 hours, then replenish the liquid again, and finally divide the volume. The current formation process has a long production cycle and equipment Low utilization rate, low production efficiency of lithium batteries, gas production during the formation process, battery swelling, poor reaction interface, affecting battery performance

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