Extending Battery Lifetime by Avoiding High SOC
Extending Battery Lifetime by Avoiding High SOC
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DOI：
10.3390/app8101825
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
E. Wikner;T. Thiringer
中科院分区：
文献类型：
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作者：
E. Wikner;T. Thiringer
本文研究了电动汽车使用不同充电状态（SOC）水平时老化的影响。广泛的测试系列进行了锂离子电池，基于石墨和NMC/LMO电极材料。在三年的时间里，以不同的10% SOC间隔进行寿命循环试验，在此期间，劣化作为循环次数的函数建立。根据试验结果的退化轨迹，设计了经验电池模型。利用电动汽车模型，推导了老化模型的载荷分布。结果表明，当只考虑在小放电深度（DODs）下不同类型驾驶的老化时，使用50% SOC的降低充电水平可将汽车电池的预期寿命提高44-130%。当考虑到日历老化时，这被证明是总老化的很大一部分。通过在停车期间将电池保持在15%的SOC，并限制高SOC的时间，日历老化的贡献可以大大减少。
The impact of ageing when using various State of Charge (SOC) levels for an electrified vehicle is investigated in this article. An extensive test series is conducted on Li-ion cells, based on graphite and NMC/LMO electrode materials. Lifetime cycling tests are conducted during a period of three years in various 10% SOC intervals, during which the degradation as function of number of cycles is established. An empirical battery model is designed from the degradation trajectories of the test result. An electric vehicle model is used to derive the load profiles for the ageing model. The result showed that, when only considering ageing from different types of driving in small Depth of Discharges (DODs), using a reduced charge level of 50% SOC increased the lifetime expectancy of the vehicle battery by 44–130%. When accounting for the calendar ageing as well, this proved to be a large part of the total ageing. By keeping the battery at 15% SOC during parking and limiting the time at high SOC, the contribution from the calendar ageing could be substantially reduced.