Analysis of overcharge problem of power battery module

doi:10.12028/j.issn.2095-4239.2018.0173

Abstract

Abstract: Lithium-ion battery overcharging is a major safty issue in using, if it is not protected as overcharge occurs, there will be a safety accident such as fire and explosion. A single cell has simple structure and the heat dissipation is good, it can be easily protected by its internal structure design and battery material formulation adjustment. The battery pack has the battery management system (BMS) and high voltage control device, and it is easy to be protected from overcharge.The battery module is in the middle level between the battery pack and the cell, and its safety is the last powerful barrier to ensure the safety of the battery pack. However, the module structure is relatively complicated, the heat dissipation is relatively poor compared to the cell, and its overcharge protection is more difficult than the cell. By analyzing the influencing factors and differences of cell and module overcharge protection, carrying out test verification, analyzing the voltage, current, temperature and other of the overcharge process, the key factors affecting the overcharge protection of the module was found and formulate corresponding improvement measures and solutions was proposed to realize the overcharge safety protection of the module.

Key words: power Li-ion battery, module, complex structure, overcharge, safety

CLC Number:

TM911

WANG Chengye, LIU Yingze, LUO Zhimin, JIN Huifen. Analysis of overcharge problem of power battery module[J]. Energy Storage Science and Technology, 2018, 7(6): 1135-1138.

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