State of charge indicator for a battery

  • US 20040041539A1
  • Filed: 06/02/2003
  • Published: 03/04/2004
  • Est. Priority Date: 06/03/2002
  • Status: Active Grant
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First Claim
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1. A state of charge indicator for a battery having a liquid electrolyte comprising:

  • a viewing rod having an observation surface at a first end, a conical reflection surface at a second end, and a generally cylindrical outer surface intermediate the first end and the second end, the viewing rod including a central longitudinal axis;

    a ball cage coupled to the second end of the viewing rod through which the electrolyte can flow; and

    at least one ball guide channel provided in the ball cage and arranged obliquely with respect to the central longitudinal axis, the ball guide channel including an upper boundary surface adjacent the conical reflection surface;

    wherein the upper boundary surface is smoothly connected to the conical reflection surface.

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