Analysis of safety performance of lithium-ion power battery during life cycle based on non-destructive testing

doi:10.12028/j.issn.2095-4239.2018.0219

Abstract

Abstract: Based on the test of charge-discharge cycle on NCM power lithium-ion battery applied in electric vehicles under different conditions, the degree of attenuation on life of battery and influenced factors are analyzed. The internal structure of NCM power lithium-ion battery before and after charge-discharge cycle tests at different rates are tested by using X-ray non-destructive testing technology, meanwhile the degree of safety failure and decay on life of battery are evaluated. A new method to study the decline in life of battery and its safety failure is proposed. In the process of charge-discharge cycle, with the continuous decline on capacity of battery, the internal structure of the battery appears more and more obvious defects based on non-destructive testing technology, therefore it indicates the rate of attenuation on life of battery increases faster and the safety of battery gets worse. Based on the comparison on tomographic images of internal structures under different SOH states, the internal structure of the NCM power lithium-ion battery used for electric vehicles has changed on varying degrees after charge-discharge cycle tested by different ratio values of current, therefore it demonstrates that service life of battery has been greatly reduced on different levels.

Key words: NCM power lithium-ion battery, X-ray non-destructive testing technology, life, attenuation, safety

CLC Number:

TM911.3

JIN Cong, GAO Shen, SUN Shiguang, TIAN Cuijun. Analysis of safety performance of lithium-ion power battery during life cycle based on non-destructive testing[J]. Energy Storage Science and Technology, 2019, 8(2): 259-263.

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