Battery tester including textile substrate

G - Physics – 01 – R

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26/112, 324/24

G01R 5/22 (2006.01) G01R 13/40 (2006.01) G01R 19/15 (2006.01) G01R 31/36 (2006.01) G02F 1/13 (2006.01) H01M 10/48 (2006.01) H01M 6/50 (2006.01)

Patent

CA 1257330

- 38 - ABSTRACT OF THE DISCLOSURE A device for testing a battery, particularly a small, portable battery, comprising a flexible, transparent substrate on which is deposited a narrow band of a black light absorbing material. A conductive material, which tapers outwardly in opposite directions from a central point to a pair of outer terminals, is then deposited atop the substrate on the same side of the substrate as the absorber layer. A layer of a cholesteric liquid crystal material is then deposited on the substrate on the opposite side from the black absorber layer. The conductive material is an epoxy cement-based conductor, preferably silver, printed or painted directly on to the substrate. An indicator scale is located along sections of the tapered conductive material. To test a dry cell battery, the terminal ends of the conductive material are placed in contact with the battery terminals, causing a current to flow which heats the conductive material, the heat generated being the most intense at the central point and radiating outwardly. The heat is transferred through the thin substrate to the liquid crystal layer which results in a color change in the liquid - 39 - crystal. The traverse of the color change along the length of the indicator scale, outwardly from the center point, is proportional to the current or voltage output or the condition of the battery to be tested and can be read on the indicator scale which is calibrated accordingly.

506513

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