基于电容的锂电池低温放电自加热方法

Discharge Self-heating Method for Low Temperature Lithium Batteries Based on Capacitance

针对锂离子电池在低温下性能衰退及安全性下降的问题,提出了一种基于电容的低温锂离子电池放电自加热方法,通过MOSFET的导通与关断,使一组电池轮流对电容进行充电,电流在流过电池内阻时产生焦耳热,实现了电池的内部循环加热。在频率较低的条件下用电容和电感串联,限制了峰值电流的同时也保证了电流有效值,从而提高了加热的稳定性。通过仿真对比,分析了加热系统的线路损耗、开关性能和加热效率,并通过实验证实了所提方案的可行性。

Aiming at the problem of lithium-ion battery performance degradation and safety degradation at low temperature,a self-heating method based on discharge of low temperature lithium-ion batteries with capacitance is proposed.Through the conduction and shutdown of MOSFET,a group of batteries can charge the capacitance in turn,and the current will generate joule heat when flowing through the internal resistance of the battery,realizing the internal circulation heating of the battery.Under the condition of low frequency,the capacitor and inductor are connected in series,which limits the peak current and ensures the effective value of current,thus improving the stability of heating.The circuit loss,switching performance and heating efficiency of the heating system are analyzed through simulation and experiment,and the feasibility of the proposed scheme is confirmed.