现代汽车价格
广汽三菱劲炫10.16638/jki.1671-7988.2020.08.0052010款奥迪a4l
一种纯电动汽车用热失稳安全试验方法开发
李文杰
（安徽江淮汽车集团股份有限公司新能源商用车研究所，安徽合肥230601）
摘要：为确保电池单体内短路后无热失控，通过模组试验方法开发逐步实现接近真实状态下的密闭环境热失稳安全性。通过采取加热丝缠绕在某一单体电池加热方式使电池温度上升，加热丝两端分别通过导线与外接电源正负极相连，中间通过开关控制闭合。该单体布置于模块中间位置，周围相邻六只单体分别布置温感，模组装配焊接。闭合继电器加热电池单体，温感连接至多路温度巡检仪监控试验过程中监控温度变化，当加热至电池单体发生失效后断开加热回路，持续观察电池温度变化及周围相邻电池是否发生失效等反应。
江淮电动汽车关键词：热失稳；加热丝；加热；短路
中图分类号：U469.72 文献标识码：A 文章编号：1671-7988(2020)08-14-03
Development of a Thermal Instability Safety Test Method for Pure Electric Vehicles
Li Wenjie
( Anhui Jianghuai Automobile Co., Ltd. New Energy Commercial Vehicle Research Institute, Anhui Hefei 230601 )
特斯拉平均售价减半利润暴涨Abstract: In order to ensure that there is no thermal runaway after the short circuit in the cell, the thermal instability safety in the closed environment close to the real state is gradually realized through the development of module test method. The heating wire is wound around a single battery to raise the temperature of the battery. The two ends of the heating wire are respectively connected with the positive and negative poles of the external power supply through wires, and the middle is closed through the switch control. The unit is arranged in the middle of the module, and six adjacent units are respectively arranged with temperature sensing, and the module is assembled and welded. Close the relay to heat the battery cell, connect the temperature sensor to the multi-channel temperature inspection instrument to monitor the temperature change during the monitoring test, disconnect the heating circuit when the heating reaches the failure of the battery cell, and continuously observe the temperature change of the battery and the failure of adjacent batteries around.
Keywords: Thermal instability; Heating wire; Heating; Short circuit
变速箱维修CLC NO.: U469.72 Document Code: A Article ID: 1671-7988(2020)08-14-03
1 引言
三元材料（NCM、NCA）电池能量密度具高达240Wh/ kg～260Wh/kg，能量密度优势明显。三元电池短路时起火，最大温升速率≥150℃/s，氧化还原温度仅200℃，相比磷酸铁锂材料低出200℃。18650、21700型三元材料电池单体用于纯电动汽车上，动力电池系统约用2000～8000只电池单体。当有一只电池单体发生内短路时，瞬间释放大量热量，在IP67的密闭环境中将导致周围相邻电池温度上升并引发失效，进而引发模组、电池系统热失控，严重影响整车的安全使用。
为确保动力电池总成的安全，通过采用加热丝加热单体
作者简介：李文杰，男，安徽江淮汽车集团股份有限公司新能源商用车研究所所长，从事新能源汽车产品开发工作10年以上。
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