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Method and apparatus for generalized recursive least-squares process for battery state of charge and state of health

  • US 20040162683A1
  • Filed: 02/18/2003
  • Published: 08/19/2004
  • Est. Priority Date: 02/18/2003
  • Status: Active Grant
First Claim
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1. A method for determining a voltage based state of charge (SOC) and state of health (SOH) of a battery system, comprising:

  • providing a model of said battery system including an equivalent circuit having both low frequency and high frequency elements;

    establishing a plurality of functional relationships including relationship of said equivalent circuit with SOC;

    reducing at least part of said plurality of functional relationships into a set of time segmented recursive functional relationships, wherein a first state at a first time t can be modeled by a functional presentation of a second state at a second time t−

    Δ

    t that occurred before said first time t; and

    computing a set of data points based upon said set of time segmented recursive functional relationships using a matrix for operation in matrix algebra.

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