Patent ID: 8017260

Claim:
A flat secondary battery comprising: an electric-power generating element provided with positive and negative electrode collectors, each of said collectors having a respective uncoated area that is free of active material; positive and negative electrode terminals for charge and discharge and that are attached to said uncoated areas of said positive and negative electrode collectors, respectively; and a third terminal that is attached directly to said uncoated area of one of said positive and negative electrode collectors and that does not directly contact either of said positive and negative electrode terminals, wherein said third terminal and a respective one of said positive and negative electrode terminals are attached to said uncoated area of said one of said positive and negative electrode collectors at different positions in order to avoid an influence on said third terminal of heat from the respective one of said positive and negative electrode terminals, wherein said third terminal has a same electric potential as said respective one of said positive and negative electrode terminals and said third terminal is attached electrically conductively to said uncoated area of said one of said positive and negative electrode collectors, and wherein a temperature of said flat secondary battery can be measured by said third terminal.