不同温度下磷酸铁锂电池内阻特性实验研究  

Experimental study on internal resistance of LiFePO_4 batteries under different ambient temperatures

作　　者：林春景[1,2] 李斌[1,2] 常国峰[1,2] 许思传[1,2] 

机构地区：[1]同济大学汽车学院,上海201804 [2]同济大学新能源汽车工程中心,上海201804

出　　处：《电源技术》2015年第1期22-25,共4页Chinese Journal of Power Sources

基　　金：国家"973"重点基础研究发展计划(2011CB711203);上海市科学技术委员会资助课题(11DZ2260400)

摘　　要：以电动汽车用能量型磷酸铁锂动力电池为研究对象，通过不同温度（一20～40℃）下的电池充放电实验和混合脉冲功率特性法（HPPC）测量电池内阻，研究了环境温度和荷电状态（SOC）对电池充放电欧姆内阻、极化内阻和总电阻的影响。结果表明：随着温度降低。充放电欧姆内阻和极化内阻均增加，但欧姆内阻的变化率大于极化内阻；欧姆内阻是电池内阻的主要组成部分，对温度的敏感性比极化内阻更高；随着温度降低，欧姆内阻增加的变化率逐渐增大；在某一固定温度下，极化内阻比欧姆内阻受SOC的影响更大；SOC在0．2～0．8范围内，电池充放电内阻基本稳定，动力电池的荷电状态应控制在此区间内，以获得良好的功率特性。Taking the LiFePO4 power batten with large capacity as the experimental subject, charging/discharging experiments and hybrid pulse power characterization （HPPC） were conducted under different ambient temperatures （--20-40 ℃） to study the effect of temperature on ohmic, polarization and total resistances. Experimental results show that ohmic and polarization resistances both increase during charging and discharging processes when temperature decreases, and the growth rate of ohmic resistance is much higher than that of the polarization resistance. Compared with polarization resistance, ohmic resistance was the major part of total resistance and much sensitive to the ambient temperature variation, The growth rate of ohmic resistance also kept growing when ambient temperature decreased. Under a certain ambient temperature, SOC had more effect on polarization resistance than ohmic resistance. Total resistance was stable with SOC variation when SOC was between 0.2 and 0.8. Thus, power batteries should be operated in this SOC range in order to achieve good power characteristic.

关 键 词：磷酸铁锂动力电池 环境温度 混合脉冲功率特性法 欧姆内阻 极化内阻 荷电状态 

分 类 号：TM912.9[电气工程—电力电子与电力传动]