Patent ID: 8282275
Filing Date: 2012-10-09
Classification: H01M,Y02E

Abstract:
1. A device for detecting abnormality in a secondary battery cell having a plurality of electrode terminals, comprising: an electrically-conductive connecting plate that connects each of the plurality of electrode terminals to other battery cells; a fastening member that fastens the connecting plate with one of the plurality of electrode terminals together; a metal plate, a first end of which being electrically and thermally connected to the one of the plurality of electrode terminals; a metal terminal joined to a second end, opposite to the first end, of the metal plate, the metal terminal being electrically and thermally joined to the one of the plurality of electrode terminals; temperature-detecting means placed near a fastened portion adjacent the fastening member and the metal plate, and detects temperature around the fastened portion; and abnormality judging means that judges abnormality in the fastening member on the basis of temperature detected by the temperature-detecting means, wherein the abnormality judging means detects looseness in the fastening member on the basis of the temperature detected by the temperature-detecting means, when a load current equal to or higher than a prescribed value is flowing from the corresponding electrode terminal to the connecting plate, and either one of the two temperature-detecting means detects temperature equal to or higher than a prescribed temperature.