锂离子电池组充放电均衡器及均衡策略

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Abstract The charging and discharging equalizer based on the buck and boost-buck chopper circuits for lithium-ion battery pack is suggested in this paper. Two different balancing strategies are used respectively according to the different battery states. The strongest battery cell with the highest state of charge(SOC) is discharged by the equalizer in the battery charging state, its charging current is lower and the rest cells of the same pack are not affected. The weakest battery cell is charged by the equalizer in the battery discharging or static state, and the rest cells are not affected. The advantages of the equalizer are as follows: 1. it is simple to control the balancing circuit and easy to be realized; 2. the balanced battery cell is selectable and the balancing energy is bidirectional; 3. the balancing current is controllable. The working principle of the two balancing strategies has been described in this paper. The balancing experiment has been completed to four serially connected LiFePO4 battery cells, and the experimental results confirm that the unbalanced degree of the four battery cells has been improved, moreover the charging and discharging capacity of the battery pack have been increased.

Key words： Buck chopper circuit boost-buck chopper circuit equalizer balancing strategy SOC LiFePO4 charging capacity discharging capacity

Received: 30 October 2013 Published: 25 May 2015

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	Liu Hongrui
	Zhang Zhaohuai

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Liu Hongrui,Zhang Zhaohuai. The Equalizer of Charging and Discharging and the Balancing Strategies for Lithium-Ion Battery Pack[J]. Transactions of China Electrotechnical Society, 2015, 30(8): 186-192.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I8/186

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