轴向压缩下圆柱形动力锂离子电池的性能 = Performance of Cylindrical Power Lithium-Ion Battery under Axial Compression

Abstract

Copyright © 2021 The Author(s). The safety of power batteries have always restricted the promotion and development of electric vehicles. The axial compression of batteries is an important issue leading to damage. The safety performance of 18650 lithium-ion battery under axial compression was studied by experiments. The characters of load, voltage and temperature of batteries with state of charge of 60%, 80%, and 100% were discussed, and the failure process of the battery under axial compression was analyzed. It was found that the voltage during the axial compression process showed a unique stepped drop, the maximum load and a sudden temperature increase occurred almost simultaneously; the local groove structure of the positive induced the battery to rupture near the positive. Comparing the batteries in axial compression with the batteries of the radial two-plate compression, it was found that the thermal runaway of power battery in axial compression is weaker than that in radial two-plate compression.