Wound-type cell

Abstract

The present disclosure provides a wound-type cell which comprises: a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector; a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and a second winding start end of the second electrode plate is positioned at an inner side of a first winding start end of the first electrode plate in a thickness direction; a separator; a first electrode tab; and a second electrode tab. A third winding start end of the separator is positioned at an outer side of the second winding start end of the second electrode plate in a length direction, extends along a direction away from a second end of the second winding start end and is not folded back.

1 .- 11 . (canceled) 
     
     
         12 . A wound-type cell, comprising:
 a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector;   a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and a second winding start end of the second electrode plate being positioned at an inner side of a first winding start end of the first electrode plate in a thickness direction;   a separator provided between the first electrode plate and the second electrode plate to separate the first electrode plate from the second electrode plate;   a first electrode tab electrically connected to the first current collector; and   a second electrode tab electrically connected to the second current collector;   wherein   a third winding start end of the separator is positioned at an outer side of the second winding start end of the second electrode plate in a length direction, extends along a direction away from a second end of the second winding start end and is not folded back.   
     
     
         13 . The wound-type cell according to  claim 12 , wherein a length of the third winding start end of the separator is between 1 mm and 5 mm. 
     
     
         14 . The wound-type cell according to  claim 12 , wherein the first electrode plate is a positive electrode plate; the second electrode plate is a negative electrode plate. 
     
     
         15 . The wound-type cell according to  claim 12 , wherein the first electrode tab is provided as one or more in number; the second electrode tab is provided as one or more in number. 
     
     
         16 . The wound-type cell according to  claim 12 , wherein
 the first electrode plate has a blank first current collector which is positioned at the first winding start end and is not coated with the first active material layer;   the second electrode plate has a blank second current collector which is positioned at the second winding start end and is not coated with the second active material layer.   
     
     
         17 . The wound-type cell according to  claim 12 , wherein
 a side of the second current collector which directly faces the blank first current collector is not coated with the second active material layer;   a side of the first current collector which directly faces the blank second current collector is not coated with the first active material layer.   
     
     
         18 . The wound-type cell according to  claim 12 , wherein an inner side of an arc-shaped portion of the second current collector which directly faces a first end of the first winding start end is not coated with the second active material layer. 
     
     
         19 . The wound-type cell according to  claim 16 , wherein
 the first end of the first winding start end is beyond the second end of the second winding start end in the length direction and a position of the first electrode tab is beyond the second end of the second winding start end in the length direction; or   the second end of the second winding start end is beyond the first end of the first winding start end in the length direction and a position of the second electrode tab is beyond the first end of the first winding start end in the length direction.   
     
     
         20 . The wound-type cell according to  claim 12 , wherein
 the first electrode plate further has a first groove, a bottom of the first groove is a blank first current collector which is exposed and a peripheral side of the first groove is the first active material layer;   the second electrode plate further has a second groove, a bottom of the second groove is a blank second current collector and a peripheral side of the second groove is the second active material layer.   
     
     
         21 . The wound-type cell according to  claim 16 , wherein
 the first electrode tab and the first current collector are integrally formed, or the first electrode tab is formed separately and welded to the corresponding blank first current collector;   the second electrode tab and the second current collector are integrally formed, or the second electrode tab is formed separately and welded to the corresponding blank second current collector.   
     
     
         22 . The wound-type cell according to  claim 20 , wherein
 the first electrode tab and the first current collector are integrally formed, or the first electrode tab is formed separately and welded to the corresponding blank first current collector;   the second electrode tab and the second current collector are integrally formed, or the second electrode tab is formed separately and welded to the corresponding blank second current collector.