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圆柱形锂离子动力电池放电过程电化学与传热特性研究

, PP. 54-61

Keywords: 电动汽车,锂离子动力电池,电化学-热耦合模型,热特性

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Abstract:

锂离子动力电池放电过程中的内部产热对电池性能和安全运行有重要影响。该文通过对磷酸铁锂动力电池建立一个涉及质量守恒、电荷守恒和能量守恒,并伴有电化学反应过程的电化学-热耦合模型,研究电池恒流放电过程的温度场和生热速率,并通过实验验证了模型的合理性。结果表明,低倍率放电时,可逆生热速率在总生热速率中所占份额较大;而高倍率放电时,欧姆热生热速率占绝对优势。大电流放电时,产热速率高,有必要使用电池热管理系统。

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