Secondary battery having third terminal in addition to positive and negative electrode terminals and storage battery using the same

Abstract

A secondary battery in which temperature rise (heat generation) can be measured accurately at the time of quick charge/discharge, and a battery which can be configured readily using the secondary batteries while realizing low resistance. Separately from the positive and negative electrode terminals of a flat laminate film secondary battery, a third terminal is fixed perpendicularly thereto. The third terminal is connected with the electrode current collecting parts of a power generating element body constituting the secondary battery ( 1 ) and imparted with a potential equal to that of any one of the positive and negative electrode terminals. Inner temperature of the secondary battery is determined by measuring the temperature of the third terminal and a cell balancer circuit, or the like, is connected with the third terminal. The battery is configured by connecting the positive and negative electrode terminals directly in series.

1 . 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   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 positive and negative electrode collectors at different positions,   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 and conductively to said uncoated area of said one of said positive and negative electrode collectors,   wherein said third terminal connects to a cell balancer circuit, and   wherein one of said positive and negative electrode terminals, that is attached to said uncoated area that is attached with said third terminal, is not connected to said cell balancer circuit.   
     
     
         2 . The flat secondary battery according to  claim 1 , provided with a plurality of anode elements that are stacked. 
     
     
         3 . The flat secondary battery according to  claim 1 , provided with a plurality of cathode elements that are stacked.