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BATTERY MANAGEMENT SYSTEM AND DRIVING METHOD THEREOF

  • US 20080036421A1
  • Filed: 06/22/2007
  • Published: 02/14/2008
  • Est. Priority Date: 08/11/2006
  • Status: Active Grant
First Claim
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1. A battery management system (BMS) for a hybrid vehicle that includes an engine control unit, a motor generator controlled by the engine control unit, and a battery in which a plurality of battery cells are grouped into a plurality of battery packs, comprising:

  • a sensor that senses temperature, current, and open circuit voltage (OCV) of the battery at a present key-on time point; and

    a main control unit (MCU) that calculates a key-off time period, the key-off time period being an amount of time that the battery has been in a key-off state from a key-off time point to a time point at which the present key-on state begins, that calculates a difference between temperatures of the battery respectively detected at the key-on time point and the key-off time point by receiving data of the temperature of the battery, that detects an OCV error range corresponding to an SOC error range at the key-off time point, and that infers an initial SOC of the battery by using the OCV and the OCV error range.

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