Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
May 11, 2010
Patent Application Number
11508905
Date Filed
August 24, 2006
Patent Citations Received
Patent Primary Examiner
Patent abstract
A plurality of discharge resistors Rd1 to Rdn having different resistance values is provided. A CPU 72 selects one from a plurality of unit cells B1 to B16 as a connection cell and selects one resistance value according to a voltage across the connection cell from the plurality of resistance values. The CPU 72 turns on/off a cell selecting switch group 2, a polarity reversing switch group 3 and a discharge resistor selecting switch group 5 and connects the connection cell to the discharge resistor having the selected resistance value to discharge stored electric charge of the connection cell, thereby equalizing the respective voltages across the unit cells.
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