基于ECM的电芯电-热耦合建模与验证  

Modeling and verification of electric-thermal coupling in batteries based on ECM

作　　者：狄云 周正柱 党会鸿 葛志浩 DI Yun;ZHOU Zhengzhu;DANG Huihong;GE Zhihao(Tianmu Lake Institute of Advanced Energy Storage Technologies,Liyang 213300,Jiangsu,China)

机构地区：[1]天目湖先进储能技术研究院,江苏溧阳213300

出　　处：《储能科学与技术》2023年第8期2638-2648,共11页Energy Storage Science and Technology

摘　　要：电芯内阻不仅影响电池的电性能,而且影响电池工作过程中的温度。本工作通过恒流充放电搁置测试,建立二阶等效电路模型(ECM),辨识电芯在不同电流、温度和SOC下的电容、电阻参数,计算电芯电性能,同时给出Bernardi产热模型中的不可逆热,不可逆热结合可逆热计算电芯产热,通过STAR-CCM+将电-热模型耦合,模拟电芯在不同工况下的电响应与温度响应;由于HPPC存在脉冲时间短、内阻体现不完整等缺点,故本工作采取恒流充放电搁置测试获得RC参数,进行等效电路仿真,研究结果表明:将恒流充放电搁置测试得到的RC参数导入电-热耦合模型中,仿真结果对比实验偏差很小。The internal resistance of a battery affects its electrical performance and the temperature during its operation.Herein,the second-order equivalent circuit model(ECM)is established through the constant-current charge-discharge shelving test,which identifies the capacitance and resistance parameters of the cell under different currents,temperatures,and state-of-charge conditions,and calculates the electric performance of the cell.Additionally,Bernardi's heat generation model is introduced to account for the irreversible heat,and the combination of irreversible and reversible heat is calculated to determine the overall heat generation within the cell.By coupling the electric-thermal model in STAR-CCM+,the electrical and temperature responses of the battery are simulated under different working conditions.To overcome the shortcomings of the hybrid pulse power characterization test,such as short pulse time and incomplete characterization of internal resistance,this study adopts a constant-current charge-discharge shelving test to obtain the RC parameters and conducts an equivalent circuit simulation.The research results show that when the RC parameters obtained from the constant-current charge-discharge shelving test are imported into the electric-thermal coupling model,the simulation results have minimal deviation compared with the experimental results.

关 键 词：等效电路模型(ECM) Bernardi产热模型 恒流充放电搁置测试 电-热耦合 STAR-CCM+ 

分 类 号：TM912[电气工程—电力电子与电力传动]