Consistency screening method for lithium-ion batteries

Abstract

The invention discloses a consistency screening method for lithium-ion batteries. The consistency screening method for lithium-ion batteries comprises the specific steps that first, a plurality of electric cores of the same type are placed under the same temperature environment in a standing mode, so that the temperature of the electric cores and ambient temperatures are kept in consistent, and then in accordance with the unified battery charging and discharging requirements of the electric cores, full charging, full discharging, and then full charging are carried out on the electric cores; second, the temperature of a environment chamber is increased to 40 DEG C, the electric cores are statically placed in the environment chamber under the temperature condition at the same time, and thena test to the internal resistance of the electric cores is started, and the internal resistance test data of each battery are recorded when the temperature of the electric cores is consistent with thetemperature of the environment chamber; and finally, the internal impedance data of all the electric cores are processed and all the electric cores within a certain range for groups or packages are selected. The consistency screening method for lithium-ion batteries has the beneficial effects that the performance of a lithium-ion battery system is improved and the bucket effect caused by the consistency problem between the electric cores is avoided.

Description

technical field [0001] The invention relates to the technical field of battery testing, in particular to a screening method for consistency of lithium-ion batteries. Background technique [0002] At present, the new off-line batteries are put into use after passing the simple static test. There is a lack of effective evaluation of the consistency of the battery cells, resulting in poor consistency after the batteries are assembled into modules or packages, and the service life and battery performance are poor. Less than effective play, increase the cost of use. Contents of the invention [0003] In view of the above-mentioned technical problems in the related art, the present invention proposes a screening method for the consistency of lithium-ion batteries, which can overcome the above-mentioned deficiencies in the prior art. [0004] For realizing above-mentioned technical purpose, technical scheme of the present invention is realized like this: [0005] A screening me...

AI Technical Summary

Problems solved by technology

[0002] At present, the new off-line batteries are put into use after passing the simple static test. There is a lack of effective evaluation of the consistency of the battery cells, resulting in poor consistency after the batteries are assembled into modules or packages, and the service life and battery performance are poor. Less than effective performance, increasing the cost of use

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