锂离子电池脉冲优化充电法的研究
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摘要
锂电池的充电时间和寿命一直是电动汽车应用的瓶颈。传统的快充技术可能会缩短锂离子电池的循环寿命。极化电压是充电电流在电池内部电化学反应效果的外在表现。充电过程中极化电压过大会缩短锂电池的寿命。提出了用脉冲充电来减轻极化电压堆积的最优充电策略,并且获取了最佳充电电流脉冲的幅值、频率和占空比,提出了基于恒极化控制的锂离子电池充电电流随电池老化的调整策略。实验结果表明这种脉冲充电方法可以在不牺牲电池寿命的情况下提高充电速度。
The charging time and lifespan of lithium-ion batteries have been the bottleneck for the tremendous application of electric vehicles. The conventional fast charging algorithms may shorten the cycle life of lithium-ion batteries. The polarization voltage is the external representation of the effect of charging current on the internal electrochemical reaction of the battery. The excessive polarization voltage during charging process can shorten the lifespan of lithium-ion batteries. An optimal charging strategy using pulse charging to mitigate the accumulation of polarization voltage was established, and the amplitude, frequency and duty ratio of the optimized charging current pulse were obtained. The charging current magnitude adjustment strategy along with battery aging was proposed based on constant polarization. The experiment results indicate that the proposed pulse charging mode can improve the charging speed without sacrificing battery life.
The charging time and lifespan of lithium-ion batteries have been the bottleneck for the tremendous application of electric vehicles. The conventional fast charging algorithms may shorten the cycle life of lithium-ion batteries. The polarization voltage is the external representation of the effect of charging current on the internal electrochemical reaction of the battery. The excessive polarization voltage during charging process can shorten the lifespan of lithium-ion batteries. An optimal charging strategy using pulse charging to mitigate the accumulation of polarization voltage was established, and the amplitude, frequency and duty ratio of the optimized charging current pulse were obtained. The charging current magnitude adjustment strategy along with battery aging was proposed based on constant polarization. The experiment results indicate that the proposed pulse charging mode can improve the charging speed without sacrificing battery life.
引文
[1]王枫.锂离子动力电池分段智能充电策略研究[D].济南:山东大学,2017.
[2]丁益.一种高效的锂离子电池快速充电方法[D].武汉:湖北工业大学,2017.
[3]刘伟,吴海桑,何志超,等.一种均衡考虑锂电池内部能量损耗和充电速度的多段恒流充电方法[J].电工技术学报,2017,32(9):112-120.
[4] MIN H, SUN W, LI X, et al. Research on the optimal charging strategy for Li-ion batteries based on multi-objective optimization[J].Energies, 2017, 10(5):709.
[5] VO T T,CHEN X P, SHEN W X.New charging strategy for lithiumion batteries based on the integration of Taguchi method and state of charge estimation[J]. Journal of Power Sources, 2015, 273(1):413-422.
[6] HU X, LI S, PENG H, et al. Charging time and loss optimization for LiNMC and LiFePO4batteries based on equivalent circuit models[J].Journal of Power Sources, 2013, 239(10):449-457.
[2]丁益.一种高效的锂离子电池快速充电方法[D].武汉:湖北工业大学,2017.
[3]刘伟,吴海桑,何志超,等.一种均衡考虑锂电池内部能量损耗和充电速度的多段恒流充电方法[J].电工技术学报,2017,32(9):112-120.
[4] MIN H, SUN W, LI X, et al. Research on the optimal charging strategy for Li-ion batteries based on multi-objective optimization[J].Energies, 2017, 10(5):709.
[5] VO T T,CHEN X P, SHEN W X.New charging strategy for lithiumion batteries based on the integration of Taguchi method and state of charge estimation[J]. Journal of Power Sources, 2015, 273(1):413-422.
[6] HU X, LI S, PENG H, et al. Charging time and loss optimization for LiNMC and LiFePO4batteries based on equivalent circuit models[J].Journal of Power Sources, 2013, 239(10):449-457.