Ptc devices for protecting batteries during charging and...

Details Ptc devices for protecting batteries during charging and... Ptc devices for protecting batteries during charging and...

H - Electricity

02

H

319/117, 320/12

H02H 5/04 (2006.01) H01M 10/44 (2006.01) H01M 10/48 (2006.01) H02J 7/04 (2006.01) H01M 6/50 (2006.01)

Patent

CA 1150769

RAYCHEM CORPORATION CASE NO. MPO291 A B S T R A C T 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 operat- ing 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.

344439

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