锂离子电池在循环过程中的产热研究

Investigation of the heat production of Li-ion batteries during cycling

采用恒温微量量热仪IMC、加速量热仪ARC与循环充放电仪Arbin的耦合装置对锂离子电池(LiNi0.8Co0.15-Al0.05O2/Mag-10系统)在不同电流密度下的循环产热和电池温度变化情况进行了系统的研究。结果表明,在中小电流密度负载下,电池的循环产热来自于可逆热和不可逆热双方的贡献;而在大电流密度负载下,不可逆热远远大于可逆热而处于主导地位。18650动力型电池在室温下以-10A电流放电时,电池的表面温度会上升18℃达到43℃。

The thermal behaviors of Li-ion cells （LiNi0.8Co0.15-Al0.05O2/Mag-10） during cycling were investigated by Arbin cycler-Isothermal Micro-Calorimeter （Arbin-IMC） and Arbin cycler-Accelerated Rate Calorimeter （Arbin-ARC） techniques, The results show that both reversible and irreversible heat contribute to the overall heat production when Li-ion cell cycled at low or medium current densities, while irreversible heat dominates the overall heat production when the cell cycled at high current densities. The temperature of a high power 18650 cell can increase up to 43℃ when it is discharged at ～ 10 A at room temperature.