Method for screening uniformity of lithium-ion batteries

Abstract

The invention discloses a method for screening the uniformity of lithium-ion batteries. The method comprises the following specific steps of firstly putting multiple same type of battery cores into the environment at the same temperature for standing, keeping the temperature of the battery cores consistent with the environment temperature, and then carrying out full charge, full discharge and fullcharge according to the uniform charge and discharge requirements of the battery cores; secondly, heating an environmental chamber to -5 DEG C and simultaneously standing the battery cores in the environmental chamber under the temperature condition; when the temperature of the battery cores is kept consistent with the temperature in the environmental chamber, beginning to test the capacity of the battery cores and simultaneously recording capacity test data of various battery cores; and finally processing the capacity data of all battery cores and selecting all battery cores within a certainrange to form a group or a pack. The method has the beneficial effects that the system performance of the lithium-ion batteries can be improved through the screening method disclosed by the invention, and the cask effect caused by the problem of the uniformity among the battery 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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