基于压降补偿的锂离子电池恒流充电方法
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摘要
研究了锂离子电池充放电过程中内阻变化特性,发现电池欧姆内阻基本不变,极化内阻在充电后期小幅增长。应用两阶段逐次逼近法估计电池满充时刻总内阻大小,提出了一种基于内阻压降补偿机制的恒流充电控制方法。与传统恒流恒压充电方式相比,该充电方法在确保充电容量的前提下极大加快了充电速度,具有较大应用价值。
The characteristics of internal resistance were studied in the charge and discharge processes of Li-ion battery. The ohmic resistance almost keeps stable, while the polar resistance increases slightly at the end.A new constant current charging method was proposed based on voltage drop compensation resulting from battery internal resistance estimated by the method of two-stage successive approximation.Compared with conventional constant current constant voltage charging method,the new charging algorithm can fully charge the battery with much less time.
The characteristics of internal resistance were studied in the charge and discharge processes of Li-ion battery. The ohmic resistance almost keeps stable, while the polar resistance increases slightly at the end.A new constant current charging method was proposed based on voltage drop compensation resulting from battery internal resistance estimated by the method of two-stage successive approximation.Compared with conventional constant current constant voltage charging method,the new charging algorithm can fully charge the battery with much less time.
引文
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[2]CHEN L R.A design of an optimal battery pulse charge system by frequency-varied technique[J].IEEE Transactions on Industrial Electronics,2007,54(1):398-405.
[3]CHEN J J,YANG F C,LAI C C,et al.A high-efficiency multimode Li-ion battery charger with variable current source and controlling previous-stage supply voltage[J].IEEE Transactions on Industrial Electronics,2009,56(7):2469-2478.
[4]HUANG J W,LIU Y H,WANG S C,et al.Fuzzy-control-based five-step Li-ion battery charger[C]//International Conference on Power Electronics and Drive Systems.Piscataway,N J:IEEE,2009:1547-1551.
[5]郭宏榆,姜久春,王吉松,等.功率型锂离子动力电池的内阻特性[J].北京交通大学学报,2011,35(5):119-123.
[6]KIM J H,LEE S J,LEE J M,et al.A new direct current internal resistance and state of charge relationship for the Li-ion battery pulse power estimation[C]//The 7th International Conference on Power Electronics.Piscataway,N J:IEEE,2007:1173-1178.
[7]LIN C H,CHEN C L,LEE Y H,et al.Fast charging technique for Li-ion battery charger[C]//15th IEEE International Conference on Electronics Circuits and Systems.Piscataway,N J:IEEE,2008:618-621.