【摘要】 动力电池组的性能和使用寿命很大程度上决定了电动汽车的性能和成本,而电池组的性能和使用寿命又受到电池生热的影响。本文以35A·h@3.7V方形锰酸锂电池为研究对象,对常温下电池的充放电生热特性和低温放电的生热特性进行实验研究,并基于Bernardi生热率建立了动力电池生热模型。研究结果表明,随着放电电流增大,电池温度快速提高,并且低温环境下可以利用电池放电生热改善电池性能;基于Bernardi生热率的动力电池生热模型能够较好模拟电池放电生热,这为后续动力电池组热管理系统研究提供了参考。更多还原

【Abstract】 The performance and cost of electric vehicle depend on the performance and lifetime of battery package,and the heat of charge-discharge thermal of battery influences the performance and lifetime of battery package. This paper researches charge-discharge thermal characteristics of 35A·h@ 3. 7V lithium-ion battery in normal temperature and cold temperature. The thermal model of the lithium-ion battery is established based on the Bernardi heat generation rate. The result shows that the battery temperature increases rapidly as the discharge current increases,and the heat generated in charge-discharge can be used to improve charge-discharge performance of battery in low temperature. The thermal model of the power battery based on the Bernardi heat generation rate can simulate the heat generation of battery during the discharge accurately. It provides a reference for subsequent power battery thermal management system research.更多还原