The performance of a lithium-ion battery depends on the collective impact of discharge current and ambient temperature. Herein, three aspects of such impact are investigated. The first is the relationship between the thermal parameters. At 0 ºC ambient temperature and 1 C discharge rate, the heat generation rate initially increases to more than 50 kW m⁻³ and then dips by almost 20% due to a consequent rise in battery temperature. The second aspect is the relationship between the thermal and the electrical parameters. The steep rise in battery temperature at low ambient temperatures lifts up the voltage and improves the electrical performance more than expected. The third aspect is the collective impact of ambient temperature and electric current on the battery performance. At 0 °C ambient temperature, an increase in current from 1 to 1.5 C increases the temperature rise rate by more than two. This increases the battery capacity by at least 6% compared with that at a 1 C rate. The investigation results are expected to improve the understanding of the collective impact of current and ambient temperature on battery performance and provide a guideline for developing an optimized thermal management system.

中文翻译：

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电流和环境温度对磷酸铁锂电池热电参数共同影响的实验研究

锂离子电池的性能取决于放电电流和环境温度的共同影响。在此，研究了这种影响的三个方面。首先是热参数之间的关系。在 0 ºC 环境温度和 1 C 放电率下，发热率最初增加到 50 kW m ^{-3 以上}然后由于电池温度随之升高而下降近 20%。第二个方面是热参数和电参数之间的关系。在低环境温度下电池温度的急剧上升会提升电压并改善电气性能，这超出了预期。第三个方面是环境温度和电流对电池性能的综合影响。在 0 °C 环境温度下，电流从 1 C 增加到 1.5 C 会使温升速率增加两倍以上。与 1 C 倍率相比，这使电池容量至少增加了 6%。