Influence of high rate charge and discharge cycle on the electronic performance and thermal safety of lithium ion battery

Abstract

Abstract: Lithium-ion batteries are widely used in electric vehicles and various energy storage devices. In this paper, cyclic aging and thermal runaway experiments under different charge-discharge rates were carried out, and the effects of large-rate charging and discharging on the performance and thermal safety of single lithium-ion batteries were studied. The results showed that the actual capacity of single lithium-ion battery is attenuated under the large-rate charge-discharge cycle, and the degree of attenuation is positively relevant to the charge-discharge rate. With the charge-discharge rate increasing, the constant current ratio is stepwise attenuation, but the coulombic efficiency still maintains in the range of 99%-100%, indicating that the reversible performance of lithium-ion batteries is normal. With the increase of the magnification, the thermal runaway trigger time, explosion pressure and jet flame temperature first increase and then decrease. The average surface temperature of the battery during explosion is 655.8 ℃, which is close to the melting point of aluminum. The explosion injection powder products are mainly metal aluminum, graphite and lithium cobalt oxide.

Key words: Lithium ion battery, high current charging and discharging, cyclic aging, thermal runaway

CLC Number:

TB39

LI Dong-qi, ZHANG Qing-song, ZHENG Shao-shuai. Influence of high rate charge and discharge cycle on the electronic performance and thermal safety of lithium ion battery[J]. Journal of Lanzhou University of Technology, 2023, 49(3): 30-35.

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