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Method and apparatus for charging sealed Ni-Cad batteries

  • US 4,213,081 A
  • Filed: 02/27/1978
  • Issued: 07/15/1980
  • Est. Priority Date: 02/27/1978
  • Status: Expired due to Term
First Claim
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1. An electrical energy storage system comprising:

  • a sealed nickel-cadmium battery having first and second terminals;

    a source of charging current;

    disconnectable means for applying a large charging current from the source to the battery;

    a diode and a capacitor connected in series between the first and second terminals of the battery, the diode being connected to the first terminal and the capacitor being connected to the second terminal to form therebetween a junction, the diode being poled to charge the capacitor as the battery voltage increases;

    comparing means having first and second inputs;

    means for connecting the junction to the first input of the comparing means;

    a connection from the first terminal of the battery to the second input of the comparing means including means for compensating for the voltage drop across the diode; and

    means responsive to the comparing means for disconnecting the applying means when the voltage at the second input drops below the voltage at the first input.

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