Battery parameter measurement

  • US 6,167,349 A
  • Filed: 04/02/1998
  • Issued: 12/26/2000
  • Est. Priority Date: 04/02/1998
  • Status: Expired due to Fees
  • ×
    • Pin
First Claim
Patent Images

1. A method for evaluating a battery jar, comprising the steps of:

  • a) applying a measured current load to said battery jar in a stepwise manner;

    b) measuring the voltage across said battery jar before said current load is applied;

    c) measuring the voltage across said battery jar at least once during the application of said current load;

    d) determining, from the at least one voltage measurement from the step c), the voltage across said battery jar immediately after said current load is applied;

    e) calculating, from the measured voltage from the step b) and the determined voltage from the step d), the ohmic resistance of said battery jar;

    f) measuring the voltage across said battery jar at least once more during the application of said current load if the step c) provided only one measurement;

    g) determining, from at least the second voltage measurement from the steps c) and f), the steady state voltage across said battery jar in response to said current load; and

    h) calculating, from the determined steady state voltage from the step g) and the determined voltage from the step d), the charge transfer resistance of said battery jar;

    wherein the step a) of applying a measured current load includes the steps of;

    a1) providing a first series of pulses of said measured current and each of a first duration; and

    a2) providing a second series of pulses of said measured current and each of a second duration;

    wherein the step e) of calculating the ohmic resistance utilizes measurements taken during said first series of pulses;

    wherein the step h) of calculating the charge transfer resistance utilizes measurements taken during said second series of pulses; and

    wherein said second duration is greater than said first duration.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×