电动车辆用锂离子电池热特性研究

为研究三元材料锂离子电池的低温性能，以国内某公司生产的三元材料2.6 A·h单体电池以及自制的23.4 A·h电池模组为研究对象，对不同放电倍率下三元材料锂离子电池放电电压、放电容量及温度等特性进行了研究.研究结果表明，当环境温度为-20℃时，单体和模组的放电端电压曲线呈非线性变化；单体电池的放电容量随放电倍率的增大而减小，电池模组的放电容量随放电倍率的增大而增大；电池放电倍率越大，电池的发热量越大，电池的温升越高，同一倍率下，电池模组中心电池的温升是单体电池温升的2.6倍.

Research on thermal characteristics of EVs lithium-ion battery

To study the cryogenic properties of NCM (Ni, Co, Mn) batteries, domestic 2.6 A·h cells and a self-made 23.4 A·h battery module were tested. The purpose of this research was to study the properties of the NCM batteries such as discharge voltage, discharge capacity and temperature characteristics under different discharge rates at a low temperature. The results show that when the ambient temperature is -20℃, the discharge terminal voltage curve of cell and battery module has a nonlinear variation. The discharge capacity of cell decreases with the increase of the discharge rate. The battery module has an opposite behavior. The discharge rate is greater, the heat release of the battery is larger, and the temperature is higher. The temperature rise of the center cell in a battery module is 2.6 times as large as a cell.