【摘要】 为探讨某森林植保机用锂离子电池自加热式热失控问题，首先探究电池单体的结构组成、各副反应的产热机理，以及电池单体、端板、隔热垫、箱体与环境之间的热辐射、热传导和对流换热3种传热方式。然后基于等效电路模型的热失控建模方法，由电芯物性参数、副反应机理、放热传热模型在AMEsim一维仿真软件中建立280 Ah大容量电池模组的热电特性模型，分析自加热热失控时的电池产热传热特征以及模组内热失控蔓延的路径，并进行仿真分析。最后并根据国标GB 38031—2020对该电池模组进行自加热试验，得到电芯温度随时间变化情况，并通过纳米CT扫描，确认触发电芯热失控具体位置。对比分析仿真与试验结果表明，建立的模型准确度高，性能可靠，电芯热失控温度最大误差为11.3%，热失控触发时间最大误差为4.2%，可为后续热失控温度预测和预防电池包热扩散的安全性等电池热管理方面的设计与开发提供技术参考。更多还原

【Abstract】 In order to investigate the self-heating thermal runaway problem of ternary lithium-ion battery used in a certain forest plant protection machine, the structural composition of the battery cell, the heat generation mechanism of each side reaction and the three heat transfer modes of heat radiation, heat conduction and convective heat transfer between the battery cell, end plate, heat insulation pad, box body and the environment were first explored. Then based on the thermal runaway modeling method of the equivalent circuit model, the thermoelectric characteristic model of the 280 Ah large-capacity battery module was established in the Amesim one-dimensional simulation software by the physical parameters of the battery cell, the side reaction mechanism, and the exothermic heat transfer model. The heat transfer characteristics of the battery during self-heating thermal runaway and the path of thermal runaway propagation in the module were analyzed and simulated. Finally, according to the national standard GB 38031—2020, the self-heating experiment of the battery module was carried out to obtain the change of the cell temperature with time, and the specific position of the thermal runaway of the trigger cell was confirmed by CT scanning. The simulation and experimental results showed that the established model had high accuracy and reliable performance. The maximum error of the thermal runaway temperature of the cell was 11. 3%, and the maximum error of the thermal runaway trigger time was 4. 2%. It can provide technical reference for the design and development of battery thermal management, such as the prediction of thermal runaway temperature and the safety of preventing thermal diffusion of battery pack.更多还原