Study on Two-Layer Equalization Method of Retired Power Battery
A two-layer equalization circuit is proposed to improve the equalization speed of retired battery packs.The bottom circuit uses a centralized Buck-Boost equalization structure based on inductance,and the top circuit uses a reconfigurable circuit structure.Accord-ing to the relationship between open circuit voltage(OCV)and battery state of charge(SOC),a segmented equalization control strategy is adopted to improve the equalization speed.Results of the simulation experiment of double-layer equalization circuit show that with the same battery parameters,compared with the traditional Buck-Boost equalization circuit,the equalization time of the double-layer circuit is reduced by 25%,and the working speed of the equalization system is improved.Under the situation that the status of battery and the topology of the equalization circuit are the same,compared with the single equalization strategy,the SOC voltage subsection equalization time is reduced by 11%,which verifies the feasibility of the proposed equalization scheme.
retired batterytwo-layer equalizationreconfigurablesegmental equalization control strategy
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