Current collector, secondary battery, electronic device, and manufacturing method thereof

Abstract

Part of an electrode, specifically a current collector and an active material layer, for a secondary battery is subjected to cutting processing to have a complex shape. For example, a stack of the first current collector and the first active material layer has a first slit and a second slit. Each of the first slit and the second slit passing across the first current collector and the first active material layer and extending from an edge of the first current collector. Another stack of the second current collector and the second active material layer has a third slit and a fourth slit. Each of the third slit and the fourth slit passing across the second current collector and the second active material layer and extending from an edge of the second current collector.

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         5 . A battery comprising:
 a current collector,   wherein the current collector comprises first to sixth sides being straight lines, and   wherein in a planar view:
 the first side and the third side face each other; 
 the first side and the fifth side face each other; 
 the second side and the sixth side face each other; 
 the first side is connected to the third side with the second side interposed therebetween; 
 the first side is connected to the sixth side; 
 the third side is connected to a curvy side with an side extending toward the first side interposed therebetween; 
 the fifth side is connected to the fourth side; and 
 the fourth side is connected to the curvy side with an side extending toward the sixth side interposed therebetween. 
   
     
     
         6 . A battery comprising:
 a current collector,   wherein the current collector comprises first to sixth sides, and   wherein in a planar view:
 the first side and the third side face each other; 
 the first side and the fifth side face each other; 
 the second side and the sixth side face each other; 
 the first side is connected to the third side with the second side interposed therebetween; 
 the first side is connected to the sixth side; 
 the fifth side if connected to the fourth side; 
 the third side is connected to the fourth side with a curvy side interposed therebetween; and 
 the battery does not comprise the current collector at a cross-point between an extending line of the third side and an extending line of the fourth side. 
   
     
     
         7 . A battery comprising:
 a current collector,   wherein the current collector comprises first to sixth sides, and   wherein in a planar view:
 the first side and the third side face each other; 
 the first side and the fifth side face each other; 
 the second side and the sixth side face each other; 
 the first side is connected to the third side with the second side interposed therebetween; 
 the first side is connected to the sixth side; 
 the fifth side is connected to the fourth side; 
 the third side is connected to the fourth side with a curvy side interposed therebetween; and 
 the curvy side is convex toward the first side.