VERFAHREN UND VORRICHTUNG ZUR ERFASSUNG DER LADUNG EINER DER EINEN LADER ANGESCHLOSSENEN SEKUNDÄRZELLE

摘要

An object of the invention is to propose a judgment method and device for connection between a secondary battery and a battery charger, in which it is unnecessary to use special wiring or other elements for the judgment. A battery charger A includes charging unit 11 for supplying electric current to the secondary battery B through a connector 6, and a charge- control unit 10 for controlling the charging unit 11. The secondary battery B includes a temperature sensing element 5 for sensing temperature of the secondary battery B. The temperature sensing element 5 has terminals, one of which is connected to a direct current power supply of the battery charger A via the connector 6 when the connection is secured. The charge- control unit 10 is connected to one of the terminals of the temperature sensing element 5, so that the output voltage of the temperature sensing element 5 is input to the charge- control unit 10 when the connection is secured. Furthermore, the charge- control unit 10 stores a standard range of the voltage of the temperature sensing element 5 and decides that the connection is not secured when the voltage input to the charge- control unit 10 is out of the standard range.