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Method of and circuit for Ni-Cd battery charge control

  • US 4,622,509 A
  • Filed: 11/09/1983
  • Issued: 11/11/1986
  • Est. Priority Date: 10/25/1983
  • Status: Expired due to Term
First Claim
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1. Method of charge control for Ni-Cd batteries, which are used in particular on a low earth orbit spacecraft, wherein said batteries are subjected to high speed charge and discharge cycles, a typical cycle lasting 1.5 hours, the individual battery cells of which are electrically isolated by means of a thermally conductive material with thin metal plates between the isolated battery cells fixed to a common metal base plate, which method comprises the steps of:

  • sensing battery temperature at the location of said thin metal plates by means of suitable temperature sensors, andterminating battery charge by detecting a change of sign of the first derivative of the battery temperature thus sensed, when this temperature derivative becomes positive following its negative value during charge.

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