LiFePO_4动力电池直流等效内阻劣化规律研究
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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 LiFePO_4 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 and0.8 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.
The cycle performance of LiFePO_4 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 and0.8 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.
引文
[1]谭晓军.电池管理系统深度理论研究[M].广州:中山大学出版社,2014:43-78.
[2] STROE D I,SWIERCZYNSKI M,STROE A I,et al. Evaluation ofdifferent methods for measuring the impedance of lithium-ion bat-teries during ageing[C]//Ecological Vehicles and Renewable Ener-gies(EVER),2015 Tenth International Conference on. IEEE,Monaco:IEEE,2015:1-8.
[3]张志杰,李茂德.锂离子电池内阻变化对电池温升影响分析[J].电源技术,2010(2):128-130.
[4]魏学哲,徐玮,沈丹.锂离子电池内阻辨识及其在寿命估计中的应用[J].电源技术,2009,33(3):217-220.
[5]谭晓军.电动汽车动力电池管理系统设计[M].广州:中山大学出版社,2011:95-117.
[6]陆泳施,谭晓军,许俊斌,等.LiFePO4动力电池容量衰减规律研究[J].电源技术,2016,40(5):964-967.
[2] STROE D I,SWIERCZYNSKI M,STROE A I,et al. Evaluation ofdifferent methods for measuring the impedance of lithium-ion bat-teries during ageing[C]//Ecological Vehicles and Renewable Ener-gies(EVER),2015 Tenth International Conference on. IEEE,Monaco:IEEE,2015:1-8.
[3]张志杰,李茂德.锂离子电池内阻变化对电池温升影响分析[J].电源技术,2010(2):128-130.
[4]魏学哲,徐玮,沈丹.锂离子电池内阻辨识及其在寿命估计中的应用[J].电源技术,2009,33(3):217-220.
[5]谭晓军.电动汽车动力电池管理系统设计[M].广州:中山大学出版社,2011:95-117.
[6]陆泳施,谭晓军,许俊斌,等.LiFePO4动力电池容量衰减规律研究[J].电源技术,2016,40(5):964-967.