基于循环寿命的电池冷却策略试验开发

Experimental Development of Battery Cooling Strategies Based on Cycle Life

为解决纯电动乘用车使用空调系统为动力电池冷却时整车空调舒适性下降的问题,结合实际开发项目,根据开发车辆销售目标区域确定用户典型出行链,根据出行链制定纯电动乘用车年日历行驶工况,并采用该工况进行整车台架环境模拟试验,完成车辆一年内在行驶、充电和存放3种状态下电池温度分布情况的统计分析,完成电池循环寿命评估,并分解各工况对电池寿命衰减的影响程度占比,对电池冷却系统控制策略进行优化。结果表明:电池冷却过程中冷却系统介入时长占比大幅下降,整车空调舒适性明显提高。

In order to solve the defects of decreased vehicle comfort of pure electric passenger car when air conditioning system is turned on to cool the power battery,this paper,combining actual development projects,determined the typical travel chain of electric vehicle according to the sales target area of developed vehicle,and formulated the annual calendar driving conditions of electric vehicle according to the travel chain.The vehicle bench environment simulation test was carried out according to the annual calendar driving conditions,and the statistical analysis of the battery temperature distribution in three states of the vehicle in driving,charging and storage within one year was completed according to the test results.The battery cycle life evaluation was completed,and the influence of each operating condition of the vehicle on the battery life attenuation was decomposed,and the battery cooling system control strategy was optimized.The results indicate that,the proportion of cooling system engaged in the battery cooling process decreases greatly,air conditioning comfort improves obviously.