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Battery management system and driving method thereof

  • US 7,902,829 B2
  • Filed: 07/17/2007
  • Issued: 03/08/2011
  • Est. Priority Date: 09/05/2006
  • Status: Expired due to Fees
First Claim
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1. A battery management system comprising a plurality of battery cells, the system comprising:

  • a voltage and current sensor for the battery that generates voltage and current signals concerning the battery; and

    a main controller that receives the voltage and current signals from the sensor and is configured to;

    (a) measure a key-on open circuit voltage (OCV) using the battery voltage signal, (b) determine whether the key-on OCV belongs to a first OCV region or a second OCV region, and (c) estimate an initial state of charge (SOC) of the battery using a linear equation when the key-on OCV belongs to the first OCV region;

    wherein the main controller is further configured to calculate the 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, and to compare the key-off time with a reference time; and

    wherein when the key-off time is longer than the reference time the main controller determines whether the key-on OCV belongs to the first OCV region.

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