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State of charge sensing means

  • US 4,203,065 A
  • Filed: 07/06/1978
  • Issued: 05/13/1980
  • Est. Priority Date: 07/08/1977
  • Status: Expired due to Term
First Claim
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1. State of charge sensing means for the sensing of the state of charge of a rechargable battery cell having a liquid electrolyte the density of which varies in response to the state of charge, comprising:

  • an electrolyte recirculating circuit comprising an inlet conduit the mouth of which opens into the cell below the electrolyte level, a container, a return conduit extending from the container back to the cell, and a pump operable to recirculate said electrolyte through said circuit,a hydrometer float in said container having an upwardly extending opaque neck the height of which above electrolyte level is a function of electrolyte density,a light source assembly on one side of the opaque neck and a light receiving assembly on the other side of the opaque neck, arranged so that light energy from the light source assembly received by the receiving assembly is a function of said height of the neck,and slave means connected to and controlled by the light receiving assembly.

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