三元锂离子动力电池针刺热失控实验与建模

摘要

针对纯电动汽车锂离子动力电池存在的一个潜在安全问题，即热失控现象，本文中对某三元锂离子动力电池最为剧烈的一种热失控，即针刺热失控的过程进行研究。通过混合脉冲能力特性实验、热箱加热热失控实验和基于已有模型，搭建了描述针刺热失控过程的集总参数模型，并进行了实验。针刺模型的预测结果得到了针刺实验的证实，这为后续的研究和系统开发奠定了基础。%Aiming at a hidden safety issue, i. e. thermal runaway phenomenon, happening in the Li-ion power battery of pure electric vehicle, the process of one of most violent thermal runaway, i. e. that with nail pene-tration in a NCM Li-ion power battery is studied in this paper. Based on hybrid pulse power characteristic ( HPPC) test, oven heating thermal runaway test and existing models, a lumped parameter model describing the process of nail penetration thermal runaway is built with corresponding experiments conducted. The prediction results with the model are validated by experiments. This lays a foundation for subsequent research and system development.