LiFePO_4动力电池直流等效内阻劣化规律研究  

Research on equivalent DC impedance degradation pattern of LiFePO_4 power batteries

作　　者：许俊斌 谭晓军 梁永贤 XU Jun-bin;TAN Xiao-jun;LIANG Yong-xian(School of Intelligent Systems Engineering, Sun Yat-sen University, Guangzhou Guangdong 510275, China)

机构地区：[1]中山大学智能工程学院,广东广州510275

出　　处：《电源技术》2019年第2期241-243,256,共4页Chinese Journal of Power Sources

基　　金：广东省科技计划项目(2015B010135006)

摘　　要：对Li Fe PO4动力电池进行循环测试,循环条件包括不同的环境温度,不同充放电倍率,不同的充放电区间和充放电深度等。通过总结直流等效内阻的劣化规律,选择荷电状态(SOC)为0.5～0.8区间的直流等效内阻总和作为内阻谱的表征参数,对比不同电池样本的直流等效内阻变化规律,结果表明工作环境温度是决定电池内阻增长速度的主要因素。The cycle performance of LiFePO4 power battery were tested under the conditions of different temperature, different charge rates, different charge/discharge range, and different DoDs (depth of discharge). By summarizing the degradation rules of equivalent DC impedance, the sum of equivalent DC impedance with the SOC between 0.5 and 0.8 was chosen as the characterization parameter of DC impedance spectrum. By comparing the change rules of different sample cells, it's concluded that the temperature is the main factor to determine the speed of impedance increase.

关 键 词：动力电池 循环寿命 内阻增长规律 

分 类 号：TM912.9[电气工程—电力电子与电力传动]