Nonaqueous electrolyte battery

Abstract

A nonaqueous electrolyte battery which is capable of minimizing damage if the battery is crushed with pressure is disclosed. The nonaqueous electrolyte battery according to the present invention incorporates: a spirally coil formed by, through a separator, winding a positive electrode which incorporates an elongated positive-electrode collector having two sides on each of which an active material for the positive electrode has been formed and a negative electrode which incorporates an elongated negative-electrode collector having two sides on each of which an active material for the negative electrode has been formed, wherein the positive electrode has a lengthwise directional end which has two sides each of which is provided with a positive-electrode-collector exposed portion in which a positive-electrode collector is exposed, the negative electrode has a lengthwise directional end which has two sides each of which is provided with a negative-electrode-collector exposed portion in which a negative-electrode collector is exposed, and the positive-electrode-collector exposed portion and the negative-electrode-collector exposed portion cover the coil one or more times through the separator.

What is claimed is:  
     
         1 . A nonaqueous electrolyte battery comprising: 
 a spirally coil formed by, through a separator, winding a positive electrode which incorporates an elongated positive-electrode collector having two sides on each of which an active material for the positive electrode has been formed and a negative electrode which incorporates an elongated negative-electrode collector having two sides on each of which an active material for the negative electrode has been formed, wherein    said positive electrode has a lengthwise directional end which has two sides each of which is provided with a positive-electrode-collector exposed portion in which a positive-electrode collector is exposed,    said negative electrode has a lengthwise directional end which has two sides each of which is provided with a negative-electrode-collector exposed portion in which a negative-electrode collector is exposed, and    said positive-electrode-collector exposed portion and said negative-electrode-collector exposed portion cover said coil one or more times through said separator.    
     
     
         2 . A nonaqueous electrolyte battery according to  claim 1 , wherein when an assumption is made that the length of said positive-electrode-collector exposed portion is L 1  and the outer diameter of said coil is d, relationship L 1 ≧πd is satisfied.  
     
     
         3 . A nonaqueous electrolyte battery according to  claim 1 , wherein when an assumption is made that the length of said negative-electrode-collector exposed portion is L 2  and the outer diameter of said coil is d, relationship L 2 ≧πd is satisfied.  
     
     
         4 . A nonaqueous electrolyte battery according to  claim 1 , wherein said coil has a structure that said negative electrode is disposed outer than said positive electrode, and said negative-electrode-collector exposed portion covers said positive-electrode-collector exposed portion.  
     
     
         5 . A nonaqueous electrolyte battery according to  claim 1 , wherein said active material for the positive electrode is composite metal oxide expressed by LiMO 2  (where M is at least any one of Co, Ni, Mn, Fe, Al and Ti).  
     
     
         6 . A nonaqueous electrolyte battery according to  claim 1 , wherein said active material for the negative electrode is any one of a carbon material, a crystalline or amorphous metal oxide permitting doping/dedoping of lithium ions.