Electrode plate, electrode body, and battery

Abstract

This electrode plate has a band-shaped core, and an active material layer formed on both surfaces of the core, and a current collector lead is connected to an exposed part at which the core is exposed. The exposed part is placed on the longitudinal direction portion of the core, and an identification display part that can specify the history of the manufacturing process is formed at a position different from the current collector lead in the exposed part. In the core, the active material layer is placed at a position on the opposite side to the identification display part in the core thickness direction.

1 . An electrode plate having a band-like electrode current collector and an active material layer formed on each of opposite surfaces of the electrode current collector, a current collector lead being connected to an exposed part in which the electrode current collector is exposed, wherein:
 the exposed part has a rectangular shape and is disposed in a part in a longitudinal direction of the electrode current collector;   an identification mark part that enables identification of a manufacturing process history record is formed at a position in the exposed part, the position being different from that of the current collector lead;   on the electrode current collector, the active material layer is disposed at a position on an opposite side in a thickness direction of the electrode current collector from the identification mark part; and   the current collector lead and the identification mark part are disposed so as to be aligned in a longitudinal direction of the exposed part.   
     
     
         2 . An electrode assembly comprising at least one first electrode plate and at least one second electrode plate that are wound with a separator therebetween,
 wherein the first electrode plate is the electrode plate according to  claim 1 .   
     
     
         3 . The electrode assembly according to  claim 2 , wherein:
 the first electrode plate is a positive electrode plate; and   the exposed part is disposed in an intermediate portion in the longitudinal direction of the electrode current collector, between two positive electrode active material layers on opposite sides in the longitudinal direction, the two positive electrode active material layers being included in the active material layer.   
     
     
         4 . The electrode assembly according to  claim 3 , wherein the identification mark part is covered together with a positive electrode lead that serves as the current collector lead, by a tape attached to the positive electrode plate. 
     
     
         5 . The electrode assembly according to  claim 2 , wherein:
 the first electrode plate is a negative electrode plate; and   the exposed part is disposed in a part extending over a predetermined width in the longitudinal direction of the electrode current collector from one end in the longitudinal direction of the electrode current collector.   
     
     
         6 . The electrode assembly according to  claim 5 , wherein the identification mark part is covered together with a negative electrode lead that serves as the current collector lead, by a tape attached to the negative electrode plate. 
     
     
         7 . The electrode assembly according to  claim 2 , wherein the identification mark part includes a number, a character, or a combination of a number and a character. 
     
     
         8 . The electrode assembly according to  claim 2 , wherein the identification mark part includes a protrusion, a hole, or a combination of a protrusion and a hole. 
     
     
         9 . The electrode assembly according to  claim 2 , wherein the identification mark part is a one-dimensional code or a two-dimensional code. 
     
     
         10 . The electrode assembly according to  claim 2 , wherein the identification mark part is formed via laser marking. 
     
     
         11 . The electrode assembly according to  claim 2 , wherein the identification mark part is formed via inkjet printing. 
     
     
         12 . A battery comprising:
 the electrode assembly according to  claim 2 ; and   a bottomed tubular outer covering can that receives the electrode assembly.