A kind of capacity division method of high-voltage lithium-ion battery

Abstract

The invention discloses a method for dividing the capacity of a high-voltage lithium ion battery, which belongs to the technical field of lithium ion battery production. The capacity dividing method of the present invention includes the first charging stage, the discharging stage, the second charging stage and the third charging stage in sequence, wherein the charging current of the first charging stage is 0.02-0.5C, and the cut-off voltage is 4.0-4.2 V, the charging current of the second charging stage is 0.5-1.0C, the cut-off voltage is 4.0-4.2V, the charging current of the third charging stage is 0.02-0.5C, and the cut-off voltage is 4.21-4.23V. This method is relatively simple, and can eliminate the insufficient power supply caused by the poor contact of the contacts of the capacity division cabinet. The lithium ion battery treated by the capacity division method can still reach a battery voltage above 4.18V after aging.

Description

technical field

[0001] The invention relates to the technical field of manufacturing lithium-ion batteries, in particular to a method for dividing the capacity of high-voltage lithium-ion batteries. Background technique

[0002] As an important part of the new energy field, lithium-ion batteries have become a new hotspot in global economic development. Compared with traditional lead-acid batteries, nickel-metal hydride and nickel-cadmium batteries, lithium-ion batteries have higher specific capacity and longer cycle life. Long, good safety performance, friendly to the environment, has gradually replaced lead-acid batteries and nickel metal hydride, nickel cadmium and other batteries, widely used in mobile phones, notebooks and electric vehicles, etc., with the rapid development of these industries, lithium-ion batteries Production and demand will also increase day by day, with a broad market space. During the manufacturing process of existing lithium-ion batteries, the fini...

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