Patent ID: 7190148
Filing Date: 2007-03-13
Classification: H01M,H02J,Y02E

Abstract:
1. An overcharge/over discharge detection apparatus for a battery pack having a secondary battery comprising: a primary terminal connected to a positive terminal of the secondary battery; a detection terminal having a first end and a second end; a wiring pattern having opposite ends with one end connected to the first end of the detection terminal and with the opposite end being open at a location in the vicinity of the primary terminal; a detection part connected to the second end of the detection terminal for detecting a change in voltage level at said detection terminal resulting from the primary terminal being short circuited to the open end of the wiring pattern by a liquid leakage of electrolyte from the secondary battery in said battery pack; a switch part for switchably connecting and disconnecting the secondary battery with an external circuit; and a control part for controlling the switch part in a case where the detection part detects the change in voltage at the detection terminal.