大尺寸锂离子电池放电时生热分析与实验  

Heating generation analysis and experiment of a large format lithium-ion cell during discharge

作　　者：宋新南[1] 叶海军 SONG Xin-nan;YE Hai-jun(School of Energy and Power Engineering, Jiangsu University, Zhenjiang Jiangsu 212013, China)

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《电源技术》2019年第2期234-237,共4页Chinese Journal of Power Sources

摘　　要：针对大尺寸锂离子电池发热量大,温度分布不均匀等热安全性问题,以45 Ah方形磷酸铁锂电池为例,建立了包括极柱、内芯、外壳等部件的锂离子电池单体几何模型。考虑到温度和放电深度对电池单体内阻的影响,使用Bernardi模型计算出锂离子电池的生热速率,研究了电池单体在不同放电倍率和不同温度下的温升变化情况,并进行了相应的实验验证。研究结果表明:大尺寸锂离子电池的放电倍率越大,温度越低,电池的温升速率越快,温度变化越大。To research the thermal security of large format lithium-ion cells such as serious heat generating and uneven temperature distribution, a 45 Ah LiFePO4 battery was taken as an example, and a geometry model of lithium-ion cell was built including two electrode plates, an electric core and a case. Taking into account the effect of temperature and discharge depth on the cell resistance, the heat generation rate of the lithium-ion cell was calculated by Bernardi's model, the temperature rise of the cell under different discharge rates and different ambient temperatures were studied, and the corresponding experimental verification was carried out. The results show that the discharge rate of large lithium-ion cell is greater, the ambient temperature is lower, the faster the temperature raise of the battery, the greater the temperature change.

关 键 词：锂离子电池 放电 生热速率 仿真 温升 

分 类 号：TM912[电气工程—电力电子与电力传动]