高功率钛酸锂负极锂离子电池的热仿真

设计不同极片结构、Super-P(导电炭黑)含量和电解液溶剂的实验方案,测试各方案186560型铝壳电池的10C放电温升曲线。通过拟合温升曲线,得到电化学-热耦合模型中的温升函数,再计算产热率及面产热率的范围及均值,将产热率代入有限元软件,模拟放电温升,模拟与实测结果相差在5%以内。多极耳结构与叠片结构电池极片的产热率差异在5%以内;正极导电剂Super-P含量由4.5%降至3.0%,产热率提升112%;电解液电导率降低20%,产热率提升6.9%。

Thermal simulation of high power lithium titanate anode Li-ion battery

Different electrode structures、Super-p(conductive carbon black)ratio formulations and electrolyte solvent experimental schemes were designed,10 C discharge temperature rise curves of 186560 aluminum shell batteries were tested in each scheme.The temperature rise function in the electrochemical-thermal coupling model was obtained by fitting the temperature rise curve,then the range and mean value of the heat generation rate and the heat generation rate per unit area were calculated.The heat generation rate was substituted into the finite element software to simulate the discharge temperature rise.The difference between simulated and measured results was less than 5%.The difference between multipolar and laminated structure batteries was less than 5%.The content of cathode conductor super-p was reduced from 4.5%to 3.0%,the heat generation rate was increased 112%;the conductivity of electrolyte was reduced by 20%,the heat generation rate was increased by 6.9%.