Battery and method for producing the same

Abstract

Sheet-shaped mixture layers are placed on both sides of a current collector to form an electrode (positive electrode) with a layered structure. The electrode with a layered structure and a counter electrode (negative electrode) thereof are wound via a separator, while a positional shift in a winding direction is caused between the current collector and the sheet-shaped mixture layers of the electrode with the layered structure, whereby a winding body is formed. The winding body is placed in a battery case (outer can) to constitute a battery. Particularly, in the electrode with a layered structure, by forming the current collector of a plain-woven wire net, a metal foil, expanded metal, a lath, or punching metal, a battery with satisfactory productivity suitable for an intermediate load can be provided at a low cost.

1 . A battery comprising: 
 an electrode with a layered structure in which sheet-shaped mixture layers are disposed on both sides of a current collector;    a counter electrode of the electrode with the layered structure; and    a separator disposed between the electrode with the layered structure and the counter electrode,    the electrode with the layered structure, the counter electrode, and the separator being wound in a spiral shape, to form a winding body, and    the winding body being placed in a battery case.    
   
   
       2 . The battery according to  claim 1 , wherein the sheet-shaped mixture layers are not substantially fixed to the current collector.  
   
   
       3 . The battery according to  claim 1 , wherein the current collector is formed of one selected from the group consisting of a plain-woven wire net, a metal foil, expanded metal, a lath, and punching metal.  
   
   
       4 . The battery according to  claim 1 , wherein the sheet-shaped mixture layers are fixed to the current collector only at an end on a winding center side.  
   
   
       5 . The battery according to  claim 1 , wherein the end of the current collector is positioned so as not to be exposed from ends of the sheet-shaped mixture layers.  
   
   
       6 . The battery according to  claim 1 , wherein a width of the current collector is smaller than that of the sheet-shaped mixture layers.  
   
   
       7 . The battery according to  claim 1 , wherein a porosity of the sheet-shaped mixture layers is 35 to 50%.  
   
   
       8 . The battery according to  claim 1 , wherein the sheet-shaped mixture layers respectively have a thickness corresponding to 4 to 10% of an inner diameter of the battery case.  
   
   
       9 . The battery according to  claim 1 , wherein a length of the sheet-shaped mixture layer positioned on an inner side of the current collector before winding is shorter than that of the current collector, and a length of the sheet-shaped mixture layer positioned on an outer side of the current collector before winding is longer than that of the current collector.  
   
   
       10 . The battery according to  claim 1 , comprising a winding body in which inner and outer surfaces of the current collector in their entirety are covered with the sheet-shaped mixture layers, and further comprising a non-aqueous electrolyte solution containing lithium perchlorate as a solute.  
   
   
       11 . The battery according to  claim 1 , wherein a number of windings of the winding body exceeds one and does not exceed three.  
   
   
       12 . The battery according to  claim 1 , wherein the counter electrode is formed of one selected from the group consisting of metal and a metal alloy.  
   
   
       13 . The battery according to  claim 1 , wherein the counter electrode is formed of one selected from the group consisting of lithium and a lithium alloy.  
   
   
       14 . A method for producing a battery, comprising: 
 disposing sheet-shaped mixture layers on both sides of a current collector to form an electrode with a layered structure;    winding the electrode with the layered structure, a counter electrode of the electrode with the layered structure, and a separator disposed between the electrode with the layered structure and the counter electrode, while causing a positional shift in a winding direction between the current collector and the sheet-shaped mixture layers, to form a winding body; and    placing the winding body in a battery case.    
   
   
       15 . The method for producing a battery according to  claim 14 , further comprising fixing the sheet-shaped mixture layers to the current collector only at an end on a winding center side.  
   
   
       16 . The method for producing a battery according to  claim 14 , comprising disposing a sheet-shaped mixture layer shorter than the current collector and a sheet-shaped mixture layer longer than the current collector respectively on both sides of the current collector, to form the electrode with the layered structure.  
   
   
       17 . The method for producing a battery according to  claim 14 , wherein a number of windings of the winding body exceeds one and does not exceed three.  
   
   
       18 . A method for producing a battery, comprising: 
 disposing sheet-shaped mixture layers on both sides of a current collector under a condition that the sheet-shaped mixture layers are not substantially fixed to the current collector, to form an electrode with a layered structure;    winding the electrode with the layered structure, a counter electrode of the electrode with the layered structure, and a separator disposed between the electrode with the layered structure and the counter electrode, while causing a positional shift in a winding direction between the current collector and the sheet-shaped mixture layers, to form a winding body; and    placing the winding body in the battery case.    
   
   
       19 . The method for producing a battery according to  claim 18 , further comprising fixing the sheet-shaped mixture layers to the current collector only at an end on a winding center side.  
   
   
       20 . The method for producing a battery according to  claim 18 , comprising disposing a sheet-shaped mixture layer shorter than the current collector and a sheet-shaped mixture layer longer than the current collector respectively on both sides of the current collector, to form the electrode with the layered structure.