加速量热仪在锂离子电池热测试中的应用

摘要

In this work the thermal behavior of the LiNi1/3Co1/3Mn1/3O2 cathode material for soft packed lithium-ion power batteries during charging and discharging at differentC-rate were conducted using the ARC (accelerating rate calorimeter) to provide an adiabatic environment. The overall heat generated by the lithium-ion battery during use, is partly reversible and partly irreversible, due to entropy change and joule heating, respectively. It indicates that the heating generation of lithium-ion cell is decided by theC-rate of charge and discharge. The heat is smaller at lowC-rate of charge and discharge. For example, the heating generation of battery increases 7.16℃ at 0.2C-rate and the entropy change heat is clearly embodied. The joule heating is more remarkable than the entropy change during charging and discharging at high C-rate. For instance, the heating generation of cell increased 25.63℃ at 1C-rate. The heat generation of charge is less than discharge at the sameC-rate. The DC inter insistence of cell at the SOC (State of Charge) of 0 to 10% increases suddenly, so the heating generation power will reach its maximum in this period during discharge. It is valuable for the design of heat dissipation in lithium-ion battery thermal management.%利用绝热加速量热仪提供绝热环境，研究了三元软包锂离子动力电池在不同倍率充放电时的发热行为。锂离子电池内部的总热量由可逆的熵变热和不可逆的焦耳热组成。进一步研究结果表明，电池发热量的大小主要由充放电倍率决定：低倍率充放电时电池发热量较小，0.2C倍率时电池温度上升7.16℃，熵变热有明显的体现；高倍率充放电时焦耳热占主导地位，熵变热几乎可以忽略，1C倍率时电池温度上升25.63℃。同一倍率下放电过程发热量大于充电过程，放电过程中电池荷电状态为0～10%时，直流内阻突然增大，此处电池发热功率最大。该研究对锂离子电池热管理的散热设计有一定的参考价值。