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储能用磷酸铁锂电池循环寿命的能量分析

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Keywords: 储能,磷酸铁锂电池,循环寿命,累积转移能量

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Abstract:

通过对储能用磷酸铁锂电池不同放电深度(40%DOD~100%DOD)的循环测试,考察电池在此期间累积的转移能量与电池老化程度之间的相关性。经过对长期循环试验的数据分析,得出电池累积转移能量与循环次数的关系符合BoxLucas模型;随着放电深度的增加,电池老化现象对电池能量转移能力的影响逐渐减小;通过计算电池即时容量衰退速度,认为电池在循环使用中经历了前期逐渐自稳定和后期加速老化的2个阶段。电池容量衰退至85%之前,深充深放与浅充浅放的使用模式对于电池能量转移能力的影响是相同的,当电池容量衰退至75%时,深充深放的使用模式在电池能量转移总量和能量效率上均优于浅充浅放的使用模式。

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