Surface treated steel sheet for battery case, battery case and battery using the case

Abstract

A surface treated steel sheet for a battery case, which has a diffusion layer of a nickel-phosphorus alloy or a nickel-cobalt-phosphorus alloy formed on the outermost layer of the inside surface of a plated steel sheet for a battery case; a battery case which is produced through forming the surface-treated steel sheet having a diffusion layer of a nickel-phosphorus alloy or a nickel-cobalt-phosphorus alloy by the deep drawing method, the DI forming or the DTR forming: and a battery using the battery case. The battery case can be used for producing a battery excellent in battery characteristics.

1 . A surface treated steel sheet for a battery case in which a diffusion layer of a nickel-phosphorus alloy is formed at a surface on the inner side of the battery case. 
   
   
       2 . The surface treated steel sheet for a battery case of  claim 1  in which an iron-nickel diffusion layer is formed as a lower layer and said diffusion layer of a nickel-phosphorus alloy is formed as an upper layer at the surface on the inner side, and an iron-nickel diffusion layer is formed as a lower layer and a nickel layer is formed as an upper layer at the surface on the outer side of the battery case. 
   
   
       3 . The surface treated steel sheet for a battery case of  claim 1  in which an iron-nickel diffusion layer is formed as a lower layer, a nickel layer is formed as an intermediate layer and said diffusion layer of a nickel-phosphorus alloy is formed as an upper layer at the surface on the inner side, and an iron-nickel diffusion layer is formed as a lower layer and a nickel layer is formed as an upper layer at the surface on the outer side of the battery case. 
   
   
       4 . The surface treated steel sheet for a battery case according to  claim 1 , wherein the diffusion layer of the nickel-phosphorus alloy contains Ni 3 P. 
   
   
       5 . The surface treated steel sheet for a battery case according to  claim 1 , wherein the thickness of the nickel-phosphorus alloy is within a range from 0.1 to 2 μm. 
   
   
       6 . The surface treated steel sheet for a battery case according to  claim 1 , wherein the phosphorus content in the nickel-phosphorus alloy is within a range from 1 to 12% by weight. 
   
   
       7 . The surface treated steel sheet for a battery case of  claim 1  in which an iron-nickel diffusion layer is formed as a lower layer and said diffusion layer of a nickel-cobalt-phosphorus alloy is formed as an upper layer at the surface on the inner side, and an iron-nickel diffusion layer is formed as a lower layer and a nickel layer is formed as an upper layer at the surface on the outer side of a battery case. 
   
   
       8 . The surface treated steel sheet for a battery case of  claim 1  in which an iron-nickel diffusion layer is formed as a lower layer, a nickel layer is formed as an intermediate layer, and said diffusion layer of a nickel-cobalt-phosphorus alloy is formed as an upper layer at the surface an the inner side, and an iron-nickel diffusion layer is formed as a lower layer and a nickel layer is formed as an upper layer at the surface on the outer side of the battery case. 
   
   
       9 . A battery case in which a diffusion layer of a nickel-phosphorus alloy is formed on the inner side. 
   
   
       10 . The battery case of  claim 9  in which an iron-nickel diffusion layer is formed as a lower layer and said nickel-phosphorus alloy layer is formed as an upper layer on the inner side and an iron-nickel diffusion layer is formed as a lower layer and a nickel layer is formed as an upper layer on the outer side. 
   
   
       11 . The battery case of  claim 9  in which an iron-nickel diffusion layer is formed as a lower layer, a nickel layer is formed as an intermediate layer and said nickel-phosphorus alloy layer is formed as an upper layer on the inner side and an iron-nickel diffusion layer is formed as a lower layer and a nickel layer is formed as an upper layer on the outer. 
   
   
       12 . The surface treated steel sheet for a battery case according to  claim 9 , wherein the diffusion layer of the nickel-phosphorus alloy contains Ni 3 P. 
   
   
       13 . The surface treated steel sheet for a battery case according to a  claim 9 , wherein the phosphorus content in the nickel-phosphorus alloy is within a range from 1 to 12% by weight. 
   
   
       14 . The battery case according to  claim 9 , which is obtained by a drawing forming method, DI forming method or DTR forming method. 
   
   
       15 . The battery using a battery case according to  claim 9  and filling a positive electrode active substance and a negative electrode active substance to the inside of the battery case.