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Battery charge control device having function to decide gassing without temperature sensor

  • US 6,246,216 B1
  • Filed: 07/03/2000
  • Issued: 06/12/2001
  • Est. Priority Date: 07/02/1999
  • Status: Expired due to Fees
First Claim
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1. A battery charge control device for controlling to charge a battery electrically connected with a load, the battery charge control device being constructed so as to charge the battery while lowering a charging current brought from the load in a step manner when the battery'"'"'s residual capacity drops during the load'"'"'s operation, the capacity measuring device comprising:

  • a memory unit for collecting and storing a sequential data of terminal voltage of the battery;

    a temporary-gassing detecting unit connected to the memory unit, the temporary-gassing detecting unit generating a signal representing that the battery is in course of reaching its gassing state when the so-collected terminal voltage of the battery exceeds a threshold value during charging the battery with a charging current;

    a voltage regulation calculating unit connected to the temporary gassing detecting unit so as to input the signal therefrom, the voltage regulation calculating unit calculating a changing rate of terminal voltage of the battery while the battery is in course of reaching the gassing state; and

    a gassing detecting unit connected to the voltage regulation calculating unit, for judging that the battery has just reached the gassing state when the calculated changing rate exceeds a preset decision value for the changing rate.

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