内阻对锂离子电池产热功率的影响

Effect of internal resistance on heat generation power of Li-ion battery

降低单体电池的产热对于电池包设计非常重要。测量18650型锂离子电池的比热容、交流阻抗、2.00 C和3.00 C倍率放电的产热功率,发现欧姆内阻产热在单极耳电池的总产热中比重最大,为58.0%。将电池改成双极耳设计,欧姆内阻产热的比重降至37.4%,与单极耳电池相比,2.00 C和3.00 C倍率放电的产热功率分别下降30.8%和34.1%。

Reducing the heat generation of a single cell was very important to the battery pack design.The specific heat capacity,AC impedance,heat generation power of the 18650 type Li-ion battery at discharge rate of 2.00 C and 3.00 C were measured.It was found that the heat generation of ohmic internal resistance was the largest proportion in the monopole ear battery,accounting for 58.0%.When the battery was changed into the bipolar ear design,the proportion of heat generated by ohmic internal resistance of the battery was reduced to 37.4%.Compared with monopole ear battery,the heat generation power of discharge rate at 2.00 C and 3.00 C was reduced by 30.8%and 34.1%,respectively.