The invention relates to an equalization method for improving capacity consistency of a series lithium ion battery pack. The equalization method comprises the following steps: 1) determining a worst single battery; 2) charging the series lithium ion battery pack, and stopping charging until the first single battery reaches the charging cut-off voltage; 3) acquiring an SOC starting point of the worst single battery; 4) discharging until the first single battery reaches the discharge cut-off voltage; 5) adjusting the SOC starting point of the worst single battery to be at the optimal SOC starting point, setting the worst single battery as the optimal SOC starting point after each charge-discharge cycle, and setting the SOC of the other single batteries to be 100%; and 6) when the capacity ofone single battery is consistent with that of the worst single battery in the charge-discharge cycle process, adjusting the optimal SOC starting points of the single battery and the worst single battery to be the same, and repeating the steps 2)-4). Compared with the prior art, the method has the advantages of simple operation, easy implementation, high feasibility and the like.

    本发明涉及一种提高串联锂离子电池组容量一致性的均衡方法,包括以下步骤:1)确定最差单体电池;2)对串联锂离子电池组进行充电,直至出现第一个单体电池达到充电截止电压后停止充电;3)获取最差单体电池的SOC起始点;4)进行放电直至出现第一个单体电池达到放电截止电压后停止放电;5)调整最差单体电池的SOC起始点使之处于最佳SOC起始点处,并在每次充放电循环后将最差单体电池置为最佳SOC起始点处,其余单体电池的SOC置为100%;6)当在充放电循环过程中出现一个单体电池容量达到与最差单体电池一致时,调整该单体电池与最差单体电池的最佳SOC起始点相同,并重复步骤2)‑4)。与现有技术相比,本发明具有操作简单、易于实现、可行性强等优点。


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    Title :

    Equalization method for improving capacity consistency of series lithium ion battery pack


    Additional title:

    一种提高串联锂离子电池组容量一致性的均衡方法


    Contributors:
    WEI XUEZHE (author) / DAI HAIFENG (author) / FANG QIAOHUA (author) / ZHAO YIYAN (author) / WANG XUEYUAN (author)

    Publication date :

    2020-06-19


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen



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