Patent ID: 6657833
Filing Date: 2003-12-02
Classification: B23K,H01H

Abstract:
A relay welding detector for detecting welding of a relay which is disposed between a switching element and a secondary battery in a system for supplying power from the secondary battery to a load through the switching element and which connects or disconnects a DC power line running from the secondary battery to the switching element, comprising:a recharging and discharging state detector which detects recharging and discharging states of the secondary battery; an interruption instructing device which, when the DC power line is connected by the relay and it is determined by the recharging and discharging state detector that the secondary battery is not being recharged or discharged, instructs an interruption of the DC power line by the relay which is not being supplied with recharging or discharging power from the secondary battery; and a welding judging device which judges welding of the relay when the interruption is instructed.