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Battery module system, method of charging battery module and charging type vacuum cleaner

  • US 7,723,956 B2
  • Filed: 03/20/2007
  • Issued: 05/25/2010
  • Est. Priority Date: 03/30/2006
  • Status: Expired due to Fees
First Claim
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1. A battery module system comprising:

  • a battery module comprising battery units which are connected in series, each of the battery units comprising a unit cell having a voltage variation rate A mV/% SOC at a full charge voltage VH1 (V) larger than 20 mV/% SOC, which is a value obtained when the unit cell is charged at a current of 1 C at 25°

    C.a current supply member which supplies current to the battery module;

    a voltage detecting member which detects a voltage of the unit cells; and

    a control member which controls the current to a current I1 until at least one unit cell reaches the full charge voltage VH1 (V) and then controls a voltage of the battery module to a voltage V2 (V) given by the following equation (1);


    V2=VH2×

    n




    (1)where VH2 is a voltage lower than a voltage VMI of the unit cell, where VM1 is a rate of variation point where rate of variation is 20 mV/% SOC, when the voltage variation rate A mV/% SOC reaches 20 mV/% SOC from less than 20 mV/% SOC and n denotes the number of battery units connected in series.

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