Electrochromic thin film state-of-charge detector for on-the-cell application
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United States of America Patent
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Sep 16, 1997
Issued Date -
N/A
app pub date -
Jun 8, 1995
filing date -
Jan 31, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A tester for use in determining the voltage and state-of-charge of a battery. The tester can be permanently mounted on the battery and employs an electrochromic cell which changes visual appearance, for example, color or intensity of color when electrically connected across the terminals of a battery. The electrochromic cell undergoes an oxidation/reduction reaction on direct application of the DC potential of the battery. The color of the electrochromic cell can be compared with a color comparison chart to determine the condition of the battery. The tester can be permanently electrically connected to the battery or, preferably, can be connected momentarily to determine the state of the battery.
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