摘要
研究了不同加热功率和过充电电流导致高镍三元锂离子电池的热失控失效机制。在不同加热功率和不同过充电倍率下分别触发电池单体和模组中单体的热失控,并结合电压-电流-温度数据分析、计算流体动力学仿真以及其他辅助手段等研究了高镍三元锂离子电池单体和模组热失控的诱发和扩散过程。测试和仿真结果表明:随着加热功率的提高,热失控响应速度逐渐加快,但热失控最高温度呈逐渐下降的趋势;较小的充电倍率可有效抑制热失控和热扩散的发生,而大倍率充电可能引发电池的热失控,由过充电引发的中间电芯的热失控未必造成整个电池模组发生热失控扩散现象。
The effects of different heating power and overcharge current on the induction and diffusion of thermal runaway of nickel-rich ternary lithium ion battery cells and modules are studied respectively.The thermal runaway experiment and simulation analysis show that as the heating power increases,the response speed of thermal runaway gradually increases,but the maximum temperature of thermal runaway is gradually decreased in the process of triggering Ni-rich ternary lithium ion battery thermal runaway under different heating powers.It also reveals that the low charge rate can effectively suppress the occurrence of thermal runaway and thermal diffusion,and the high charge rate may cause thermal runaway of the battery.
作者
田君
王垒
高洪波
胡道中
张锟
TIAN Jun;WANG Lei;GAO Hongbo;HU Daozhong;ZHANG Kun(China North Vehicle Research Institue,Bejing 100072,China;Beijing HyperStrong Science and Technology Co.,Ltd.,Beijing 100084,China)
出处
《电源技术》
CAS
北大核心
2024年第1期79-86,共8页
Chinese Journal of Power Sources
基金
国家自然科学基金项目(52075028)。
关键词
锂离子电池
热失控
加热
过充电
lithium ion battery
thermal runaway
heating
overcharge
