航空锂离子电池内阻测试研究

Testing study on resistance of aviation lithium-ion battery

以航空钴酸锂离子电池为研究对象,通过混合脉冲功率特性测试方法来测试钴酸锂离子电池在不同温度和SOC状态下内阻变化规律。通过数据计算出钴酸锂离子电池的欧姆内阻和极化内阻,并分析现象产生的原因。研究表明:在相同温度下钴酸锂电池的SOC处于20%~90%范围内极化内阻波动很小,可视为定值。当电池处于相同的SOC下,随着环境温度降低特别是低于10℃时,极化内阻上升显著。当电池处于相同温度下时,当温度低于10℃时,随着SOC的减小钴酸锂电池欧姆内阻上升显著。得出结论是钴酸锂离子电池的极化内阻对温度变化敏感,而欧姆内阻对SOC变化敏感。钴酸锂离子电池的内阻特性变化规律为在线SOC估算提供研究基础和依据。

The hybrid pulse power characterization(HPPC) method was employed for testing resistance of aviation lithium-ion battery under different temperature and stage of charge(SOC). By calculating the ohm resistance and polarization resistance of the aviation lithium-ion battery, the reasons for this phenomenon were analyzed. The results show that the polarization resistance is stable when SOC is between 0.2 and 0.9 at the same temperature,and it can be regarded as invariant. When the battery is at the same SOC, the polarization resistance significantly increases with the decrease of the temperature, especially below 10 ℃. When the battery is at the same temperature and the temperature is below 10 ℃, the ohm resistance significantly increases with the decrease of SOC. when,battery. The conclusion is that the polarization resistance of the battery is sensitive to temperature variation, and the ohm resistance of the battery is sensitive to SOC. The battery internal resistance characteristics variation rule provides the theoretical basis and data support for the SOC online prediction.