Model Evaluation and Analysis for Multi-topology Lithium Battery Pack External Short Circuit Characteristics

doi:10.3901/JME.2023.06.159

Abstract

Abstract: The development of electric vehicles is hampered by the safety of power batteries. The external short circuit fault of lithium-ion battery pack is one of the main factors that lead to the thermal runaway of batteries and the fire and explosion of vehicles. Different topologies and initial SOC conditions of the lithium-ion battery pack affect the characteristics of external short circuit fault. This paper conducted the external short circuit test of Muti-topology lithium-ion battery pack, which is in the static condition, with designing the lithium-ion battery pack external short circuit fault test platform. The test reveals different topology and different initial SOC influence on lithium-ion battery pack external short circuit characteristics, with the simulation of vehicles in the rear external short circuit fault process. And it provides data support for the lithium-ion battery cell sorting into groups and external short-circuit faults detection. In addition, the reconstruction of external short circuit model of lithium-ion battery is the basis for fault detection. This paper comprehensively evaluates the prediction accuracy of external short circuit model by different equivalent circuit models, which provides guidance for the selection of external short circuit model of lithium-ion battery.

Key words: multi-topology lithium-ion battery pack, external short circuit, evaluation of external short circuit model

CLC Number:

TM912

YU Quanqing, WANG Can, LI Jianming, TANG Aihua, ZHAO Lijun. Model Evaluation and Analysis for Multi-topology Lithium Battery Pack External Short Circuit Characteristics[J]. Journal of Mechanical Engineering, 2023, 59(6): 159-172.

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