电动汽车安全，是目前整个新能源汽车行业以及相关部门单位十分重视的问题。车用电池系统重要的安全性要求之一是热失控触发后有效阻燃或减缓热蔓延的速度。电动车行业已形成相对完善的标准，对于热扩散发生对司乘保护有明确的时间要求。采用理论研究、结合实验测试(含电池、模组，电池包测试)的研究方法，针对电池在结构上进行优化设计，通过对比测试及拆解分析，验证一种有效的软包电池热扩散的防护方法，为后续开发设计电池系统的热扩散防护方案提供参考依据。

Electric vehicle safety is an issue that whole new energy vehicle industry, and relevant departments attach to great importance.One of the requirements of automotive battery system is effective flame retardant or slow the spread speed after thermal runaway triggering.Electric vehicle industry has had a relatively perfect standard, the minimize time have been defined to protect driver and passenger.This paper adopts theoretical research, combined with experimental testing(including module and battery pack testing) research method, conducts structural optimization for battery design, verifies an effective thermal protection method through comparative analysis, and provides a basis for development and design of thermal protection schemes to battery system.