Indicator of full charge for secondary cell or battery thereof

Details Indicator of full charge for secondary cell or battery thereof Indicator of full charge for secondary cell or battery thereof

1981-10-20

1983-04-12

LeFevour, Charles F.

Chemistry: electrical current producing apparatus, product, and

With measuring, testing, or indicating means

For charge or liquid level

320 48, H01M 1048

Patent

active

043798160

ABSTRACT:
An indicator of full charge for secondary sealed cells and like cells which become heated when subjected to overcharge current, or batteries of such cells, undergoing a charging operation includes a heat sensitive mechanism adapted to change a perceivable characteristic in response to the rise in temperature of the cell or battery as the charging operation continues beyond full charge. Part of the heat sensitive mechanism is thermally coupled to the battery or cell and another part is maintained at ambient temperature so that the perceivable characteristic of the portion maintained at ambient temperature and that of the portion at the raised temperature of the overcharged battery or cell can be readily observed to signify that full charge has been attained. As preferably embodied, the heat sensitive mechanism is a liquid crystal material.

REFERENCES:
patent: 2980754 (1961-04-01), Reilly et al.
patent: 3445291 (1969-05-01), Stein
patent: 3977908 (1976-08-01), Kitai

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