Alkaline storage battery

Abstract

An alkaline storage battery of the present invention includes a battery case and a group of electrodes. The battery case is provided with a resin case and a coating layer made of a resin formed on at least one surface selected from an inner surface and an outer surface of the resin case. The hydrogen permeability coefficient of the resin that is the material of the coating layer is 1×10 −15 mol·m/m 2 ·sec·Pa or less.

What is claimed is:  
     
         1 . An alkaline storage battery including a battery case and a group of electrodes arranged in the battery case, wherein 
 the battery case comprises a resin case and a coating layer made of a resin formed on at least one surface selected from an inner surface and an outer surface of the resin case, and    a hydrogen permeability coefficient of the resin that is the material of the coating layer is 1×10 −15  mol·m/m 2 ·sec·Pa or less.    
     
     
         2 . The alkaline storage battery according to  claim 1 , wherein 
 the resin of the coating layer is at least one resin selected from the group consisting of polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyacrylonitrile and polyvinylidene chloride.    
     
     
         3 . The alkaline storage battery according to  claim 1 , wherein 
 the resin case is made of a polymer alloy of polypropylene and polyphenylene ether.    
     
     
         4 . The alkaline storage battery according to  claim 1 , wherein 
 a thickness of the coating layer is in a range from 5 μm to 100 μm.    
     
     
         5 . The alkaline storage battery according to  claim 1 , wherein 
 a hydrogen permeability of the coating layer is 1×10 −11  mol/m 2 ·sec·Pa or less.    
     
     
         6 . The alkaline storage battery according to  claim 1 , wherein 
 the coating layer is formed on an outer surface of the resin case.    
     
     
         7 . The alkaline storage battery according to  claim 1 , comprising a multilayered film formed on the at least one surface, wherein 
 the multilayered film includes the coating layer.    
     
     
         8 . The alkaline storage battery according to  claim 7 , wherein 
 the multilayered film is integrated with the resin case by insert molding or two-color molding.    
     
     
         9 . The alkaline storage battery according to  claim 7 , wherein 
 the multilayered film includes a surface layer made of a water resistant resin.    
     
     
         10 . The alkaline storage battery according to  claim 7 , wherein 
 the multilayered film includes a layer containing a resin constituting the resin case on a surface in contact with the resin case.    
     
     
         11 . An alkaline storage battery including a battery case and a group of electrodes arranged in the battery case, wherein 
 the battery case comprises a resin case and a multilayered film formed on at least one surface selected from an inner surface and an outer surface of the resin case, and    the multilayered film includes a surface layer made of a resin and a metal layer disposed between the surface layer and the resin case.    
     
     
         12 . The alkaline storage battery according to  claim 11 , wherein 
 the multilayered film further comprises a resin layer disposed between the metal layer and the resin case.    
     
     
         13 . The alkaline storage battery according to  claim 12 , wherein 
 the multilayered film is integrated with the resin case by insert molding.    
     
     
         14 . The alkaline storage battery according to  claim 11 , wherein 
 the resin case is made of a polymer alloy of polypropylene and polyphenylene ether.    
     
     
         15 . The alkaline storage battery according to  claim 11 , wherein 
 the metal layer is made of aluminum.