磷酸铁锂电池内阻的研究

内阻是锂离子电池的重要性能指标,测量了不同温度、不同频率下的交流内阻、直流内阻及电化学阻抗,结果表明:相同温度下,电池交流内阻随频率降低而增加;相同低频下,交流内阻随温度的降低而增加;高频(1 kHz)下,电池交流内阻对温度不敏感;低频下,交流内阻与直流内阻呈线性关系,而且电池交流内阻越大,直流内阻越大;相同频率下,交...

Study on internal resistance of lithium iron phosphate battery

Internal resistance is an important performance index of lithium-ion battery.By measuring the AC internal resistance,DC internal resistance and electrochemical impedance at different temperatures and frequencies,it is found that the AC internal resistance increases with the decrease of frequency at the same temperature;at the same low frequency,the AC internal resistance increases with the decrease of temperature;at high frequency(1 kHz),the battery AC internal resistance is not sensitive to temperature;there is a linear relationship between AC internal resistance and DC internal resistance at low frequency,and the larger the AC internal resistance at low frequency,the greater the DC internal resistance;at the same frequency,the value of AC internal resistance is almost the same as that of electrochemical impedance.