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New Composite Equalization Strategy for Lithium Battery Packs

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Document pages: 9 pages

Abstract: In order to improve the working efficiency of thepower battery pack and prolong the service life, there is a problem ofinconsistency among the individual cells. Based on the centralized equalizationstructure of the multi-output winding transformer, a three-stage hybridequalization control strategy is designed for equalization. The equalizationscheme realizes that the high voltage single battery transfers the energy tothe low voltage battery cell during the charging of the battery pack, improving not only charging efficiency and energy use loss, but also the high voltagebattery transferring the power to the low voltage battery cell when thepressure difference is greater than 10 mv during the discharge. Between 5 mvand 10 mv, it performs passive equalization, reducing the output fluctuation ofthe power battery pack and achieving the balance purpose. During the standingtime, the maximum active balancing operation within the battery pack isperformed in order to achieve intra-group optimum consistency. It is proved by experiments that the equalization control method can realize the quick and effective equalization in the battery pack, and the energy balance of each singlebattery.

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