Cylindrical secondary cell and a method of its manufacture

Abstract

This disclosure presents an electrode lead plate ( 6 ) for a cylindrical secondary cell ( 1 ) comprising a terminal part ( 4 ) and an electrode roll ( 3 ) comprising a conductive sheet ( 3 a ). The electrode lead plate ( 6 ) comprises an inner contact region ( 6 c ) configured to be arranged in direct electrical contact with the terminal part ( 4 ), an outer contact region ( 6 e ) configured to be arranged in direct electrical contact with the conductive sheet ( 3 a ), and a fuse region ( 6 d ). Further, a terminal part ( 4 ) and a cylindrical secondary cell ( 1 ), as well as uses and methods of manufacture, are presented.

1 . A cylindrical secondary cell ( 1 ) comprising:
 a terminal part ( 4 );   an electrode roll ( 3 ) comprising a conductive sheet ( 3   a ); and   an electrode lead plate ( 6 ) that comprises:
 a circular inner contact region ( 6   c ) configured to be arranged in direct electrical contact with the terminal part ( 4 ), 
 an annular outer contact region ( 6   e ) configured to be arranged in direct electrical contact with the conductive sheet ( 3   a ), wherein the annular outer contact region ( 6   e ) radially surrounds the circular inner contact region ( 6   c ), and 
 fuse elements in the form of bridges ( 6   f ) arranged between the inner contact region ( 6   c ) and the outer contact region ( 6   e ), the bridges ( 6   f ) being adapted to break when a predetermined current passes through the bridges ( 6   f ). 
   
     
     
         2 . The cylindrical secondary cell ( 1 ) of  claim 1 , wherein the bridges ( 6   f ) form a current conducting area that is decreased by an indentation formed in the bridges ( 6   f ). 
     
     
         3 . The cylindrical secondary cell ( 1 ) of  claim 1 , wherein there are two bridges ( 6   f ). 
     
     
         4 . The cylindrical secondary cell ( 1 ) of  claim 1 , wherein there are three bridges ( 6   f ). 
     
     
         5 . The cylindrical secondary cell ( 1 ) of  claim 1 , wherein there are four bridges ( 6   f ). 
     
     
         6 . The cylindrical secondary cell ( 1 ) of  claim 1 , wherein the inner contact region ( 6   c ) is recessed in relation to the outer contact region ( 6   e ). 
     
     
         7 . The cylindrical secondary cell ( 1 ) of  claim 1 , the electrode lead plate ( 6 ) comprising a number of electrolyte flow holes ( 6   g ). 
     
     
         8 . A method of manufacturing the cylindrical secondary cell ( 1 ) of  claim 1 , comprising the step of arranging the electrode lead plate ( 6 ) in direct electrical contact with the terminal part ( 4 ) and with the conductive sheet ( 3   a ).