Charge State Equalizing Device And Assembled Battery System Provided With Same

• US 20110006734A1
• Filed: 03/10/2009
• Published: 01/13/2011
• Est. Priority Date: 03/11/2008
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Murao, Hiroya, Kirimoto, Mika
• Application Number:
  US12/922,080
• Publication Number:
  US 20110006734A1
• Time in Patent Office: Days
• US Class Current: 320/118
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/0053 relating to fuel cells
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: H01M 10/441 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H02J 7/0016 using shunting, discharge or bypass circuits
• CPC Class Codes: H02J 7/007184 in response to battery voltage gradient
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 90/40 Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

A device that equalizes state of charge of each of a plurality of cells connected in series which form an assembled battery includes a control circuit and a discharge circuit for discharging each cell. The control circuit includes a unit that derives, for each cell to be discharged having a state of charge evaluation value different from an equalization target value, a discharge time or discharge end value with which the state of charge of a cell to be discharged becomes equal to that of a cell not to be discharged, and a unit that starts the discharge by the discharge circuit 21 for the cell to be discharged, and thereafter ends the discharge by the discharge circuit for each cell to be discharged when the derived discharge time has elapsed or when the state of charge evaluation value reaches the derived discharge end value.

Claims