Protection of batteries

Details Protection of batteries Protection of batteries

1979-01-26

1981-03-10

Hickey, Robert J.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

338 22R, 361106, 320 51, H02J 704, H02H 504

Patent

active

042556988

ABSTRACT:
Improved methods of battery charge and/or discharge control make use of an electrical device which is connected in series with the cell or cells of the battery and which is preferably a permanent part of the battery, so that when the battery terminals are connected in order to charge or discharge the battery, the device provides an automatic guard against excessive battery temperatures and/or current discharges. The device comprises a PTC element which is preferably composed of a conductive polymer composition, and which is in a low resistance state under normal operating conditions but which changes to a high resistance state (and thus reduces the charging current or the discharge current) when the temperature and/or current become excessive.

REFERENCES:
patent: 2157139 (1939-05-01), Mirick
patent: 3025455 (1962-03-01), Jonsson
patent: 3171076 (1965-02-01), Medlar
patent: 3243753 (1966-03-01), Kohler
patent: 3518524 (1970-06-01), Roszyk
patent: 3667026 (1972-05-01), Bogut et al.
patent: 4091267 (1978-05-01), Grant

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