A Lithium-ion battery formation process

Abstract

The invention discloses a lithium ion battery formation process, which comprises the following steps: injecting 80% to 90% of the semi-finished battery at one time to obtain a first pretreatment battery; leaving the first pretreatment battery at room temperature for 10 to 14 hours to obtain a second pretreatment battery 2. Pretreatment battery: transfer the second pretreatment battery into an oven at 45°C and let it stand for 4-8 hours to obtain the third pretreatment battery; form the third pretreatment battery under negative pressure at 45°C, the negative pressure ‑80~‑90kpa, the formation time is 3h, and the fourth pretreatment battery is obtained; the fourth pretreatment battery is transferred to an oven at 45°C for 10~14h, and the fifth pretreatment battery is obtained; the fifth pretreatment battery 10%-20% of liquid is injected into the battery for the second time to obtain a sixth pretreated battery; the sixth pretreated battery is subjected to a capacity separation test to obtain a battery. The formation process of the lithium-ion battery of the present invention solves the problem of gas generation in the formation process of the existing lithium-ion battery, controls battery swelling, optimizes the reaction interface, and improves battery performance.

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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