低温环境下锂离子电池组双重保护系统的实验研究

A Study on the Dual-Protection System of Lithium-ion Battery Pack at Low-temperature Environment

为改善锂电池组低温下的性能表现,组合多种相变材料与电加热装置,提出一种锂电池低温保护系统。针对一个三串三并的锂电池组模块,首先在25℃,0℃,-20℃温度工况下进行有、无保护系统的对比性放电实验;然后在-20℃温度工况下进行长时间的保温放电实验。结果表明,无保护系统的锂电池组在低温环境下,出现了明显的性能衰退,而带有保护系统的锂电池组在低温环境下,则可以维持锂电池组温度在合适的工作范围内,其参数变化接近常温时放电的表现,有效保证了锂电池低温下的性能。

In order to improve the performance of lithium-ion battery at low temperature,a low temperature protection system for lithium-ion battery is proposed by combining a variety of phase change materials and electric heating devices.For a three series and three parallel lithium-ion battery module,the comparative discharge experiment with and without protection system is carried out at 25℃,0℃and-20℃,and then the long-term insulation discharge experiment is carried out at-20℃.The results show that the performance of the lithium-ion battery without protection system declines obviously in low temperature environment,while the lithium battery with protection system can maintain the temperature of the lithium-ion battery in a proper working range in low temperature environment,and its parameters change close to the performance of discharge at room temperature,which effectively guarantees the performance of the lithium-ion battery at low temperature.