×

Method of and apparatus for measuring the state of discharge of a battery

  • US 4,743,855 A
  • Filed: 11/03/1986
  • Issued: 05/10/1988
  • Est. Priority Date: 12/12/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of measuring the state of discharge of a battery having an internal impedance, which comprises:

  • (a) measuring a first internal complex impedance of the battery at a first frequency;

    (b) measuring a second internal complex impedance of the battery at a second frequency;

    (c) determining the complex difference between said internal complex impedances; and

    (d) determining the argument of said complex difference, said argument being representative of the state of discharge of the battery.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×