Method for quickly detecting self-discharge consistency of lithium ion battery and test device

Abstract

The invention discloses a method for quickly detecting self-discharge consistency of a lithium ion battery and a test device. The detecting method comprises the steps that the fact that a battery corefixture arranged in a heating device is electrically connected with the positive and negative poles of a charging and discharging device is determined; the battery core fixture clamps the positive and negative poles of a battery core to be tested; the charging and discharging temperature of the heating device and the charging and discharging standby time of the charging and discharging device areset; when the heating device is kept at the charging and discharging temperature, the charging and discharging device is activated; at the charging and discharging standby time, the voltage value ofthe battery core is recorded; the voltage change value of the battery core before and after charging and discharging standby time is calculated; and battery cores with great self-discharge consistencyare sorted out and used for lithium ion battery grouping, wherein the voltage change value of the battery cores is less than or equal to a voltage calibration value. According to the invention, theself-discharge normal temperature environment of battery cores is deteriorated; the voltage change value is used as the measuring standard; in a high temperature environment, the self-discharge rateof lithium ion battery cores is accelerated; the test period is shortened; and the method is fast and accurate, and can be used to carry out real-time voltage monitoring on battery cores.

Description

technical field [0001] The invention relates to the field of detection of the performance of lithium-ion battery cells, in particular to a test method and a test device for the self-discharge consistency of lithium-ion battery cells. Background technique [0002] Self-discharge is a phenomenon of natural loss of battery capacity during storage, which is directly manifested as a drop in open-circuit voltage after storage for a period of time. The common self-discharge test method is to use a separate charge and discharge device, such as battery charge and discharge cabinet, Arbin electrochemical tester, Chenhua electrochemical workstation and other equipment, to test the capacity retention rate of lithium-ion battery cells after 28 days of storage at room temperature , and then judge the self-discharge consistency of the cells through the test data, and remove the cells with poor self-discharge consistency through the test. Poor self-discharge consistency means that the self...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that batteries with poor self-discharge consistency cannot be quickly and accurately checked out in the existing lithium-ion battery cell self-discharge consistency test method, the present invention proposes a simple, easy, fast and accurate method for checking out cells with poor self-discharge consistency Lithium-ion battery method and corresponding device

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