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

A lithium-ion battery and testing device technology, applied in measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problem of not being able to quickly and accurately check out the battery cells, and achieve fast testing methods, accelerated self-discharge rate, and shortened cycles. Effect

Pending Publication Date: 2018-06-22
GREE ELECTRIC APPLIANCES INC
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  • Summary
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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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0023] First, check to confirm that the battery cell fixture 4 provided in the oven 2 is electrically connected to the positive and negative electrodes of the battery charging and discharging cabinet 1, and the battery cell fixture 4 is correspondingly clamped to the positive and negative pole ears of the lithium-ion battery cell 5 to be tested, Ten batteries can be fixed separately. Then set the charge and discharge temperature of the oven 2 to 60°C, and set the charge and discharge hold time of the battery charge and discharge cabinet 1 to 120 min.

[0024] Then, the oven 2 is powered on, and when the charging and discharging temperature in the oven is kept at 60°C, the working program of the battery charging and discharging cabinet 1 is started. Observe the change of the voltage of the battery cell 5, and record the voltage value of the battery cell.

[0025] Finally, calculate the voltage change value of the battery cell 5 before and after discharge, and sort out the cell...

Embodiment 2

[0029] First, check to make sure that the cell fixture 4 set in the muffle furnace 2 is electrically connected to the positive and negative electrodes of the Arbin electrochemical tester 1, and the cell fixture 4 is correspondingly clamped to the positive and negative electrodes of the lithium-ion cell 5 to be tested The tabs can hold ten batteries respectively. Then set the charge and discharge temperature of the muffle furnace 2 to 65°C, and the charge and discharge hold time of the Arbin electrochemical tester 1 to 150 min.

[0030] Then, the muffle furnace 2 is turned on and powered on. When the charge and discharge temperature in the muffle furnace is maintained at 65°C, the Arbin electrochemical tester 1 working program is started. The computer control terminal can observe the change of the voltage of the battery cell 5 in real time, and record the voltage value of the battery cell.

[0031] Finally, calculate the voltage change value of battery cell 5 before and after ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36B07C5/344
CPCG01R31/385B07C5/344
Inventor 周志红蒋世用段科李乾乾吉纯魏文飞吴西燚
Owner GREE ELECTRIC APPLIANCES INC
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