大容量储能锂电池电芯产热特性研究

Study on Heat Production Characteristics of Lithium-ion Batteries for Large Capacity Energy Storage

研究大容量储能锂电池电芯的产热特性对于锂电池储能热管理设计有重要意义。采用实验方法测量了电芯的导热系数、比热、电芯在充电和放电过程的绝热温度特性,建立了考虑电芯内部的热传导、电芯表面与空气的自然对流换热的传热模型。数值模拟获得了充电和放电过程中电池最后达到的最高温度、最大温升随着充放电倍率变化的规律,电芯表面温度随时间的变化规律,电芯之间的最佳间距,以及冷却进风量随进风温度变化的规律。结果表明,大容量储能锂电池充电过程产热量略高于放电过程产热量。

It is important to study the heat production characteristics of large capacity energy storage lithium-ion battery cells for the design of thermal management of lithiumion battery energy storage.The thermal conductivity and specific heat of the cell and the adiabatic temperature characteristics of the cell during charging and discharging were measured by experimental method.A heat transfer model considering the heat conduction inside the cell and the natural convection heat transfer between the surface of the cell and the ambient was presented.The maximum temperature and the maximum temperature rise of the cell during charging and discharging were obtained by numerical simulations.The variation of the surface temperature of the cell with time and the optimum-ion distance between the cells were obtained.At the same time,the variation trends of the cooling air quantity changing with the inlet air temperature were obtained.The results show that the heat production of lithium-ion battery with large capacity during charging is slightly higher than that during discharging.