锂离子电池均衡控制策略

Lithium-ion Battery Balance Control Strategy

为了在锂离子电池均衡过程中,能够仅依靠电池端电压实现电池均衡的目标,提出了一种新的均衡控制策略,并设计和制作了电池均衡测试平台。在电池均衡末期,对被均衡电池增加均衡电流与直流内阻之积的均衡压降补偿。进行了电池均衡控制策略的实验研究,结果表明:若未使用均衡压降补偿控制策略,当电池组处于放电状态时,被均衡电池端电压与目标端电压之差为7 mV;当电池组处于静置状态时,该电压差为9 mV;若使用均衡压降补偿控制策略,当电池组处于放电状态时,该电压差为2 mV,而当电池组处于静置状态时,该电压差也为2 mV。所提出的策略在几乎不增加工作量的前提下具有更好的性能表现,对于电动汽车等场合具有较好的应用前景。

In order to achieve the goal of battery equalization in the process of lithium-ion battery equalization by only relying on the voltage of lithium-ion battery,a new equalization control strategy is proposed,in which the equalization voltage drop compensation of the product of equalization current and internal resistance is added to the equalized battery at the end of battery equalization.The testing results show that if the equalization voltage drop compensation control strategy is not used,the difference between the voltage is 7 mV when the battery pack is discharged,and 9 mV when the battery pack is in the static state,if the equalization voltage drop compensation control strategy is used,the difference between the voltage is 2 mV when the battery pack is discharged,and 2 mV when the battery pack is in the static state.The proposed strategy has better performance with almost no increasing in workload,and has better application prospects for electric vehicles,etc.