Manganese dry battery and manganese dry battery manufacturing method

Abstract

An added element other than zinc is yielded at the grain boundaries of zinc forming a negative electrode zinc can. The added element includes at least one element selected from the group of Pb, Bi, Ca, Mg, Si, Al, and In. The zinc can is formed in such a manner that: melted zinc containing the added element is quenched at a quenching rate of 75 to 100° C./second for casting into a zinc plate; and the thus cast plate is subjected to impact molding at a temperature in the range between 20 and 30° C.

1 . A manganese dry battery comprising:
 a negative electrode zinc can as a battery can made of zinc to which an added element is added,   wherein the added element other than zinc is yielded at a grain boundary of the zinc.   
     
     
         2 . The manganese dry battery of  claim 1 ,
 wherein the added element is at least one element selected from the group consisting of Pb, Bi, Ca, Mg, Si, Al, and In.   
     
     
         3 . The manganese dry battery of  claim 1 ,
 wherein the negative electrode zinc can is formed of a zinc plate formed by quenching melted zinc containing the added element at a quenching rate in a range between 75 and 100° C./second.   
     
     
         4 . The manganese dry battery of  claim 3 ,
 wherein the negative electrode zinc can is formed by impact molding at a temperature in a range between 20 and 30° C.   
     
     
         5 . The manganese dry battery of  claim 2 ,
 wherein an amount of the added element is in a range between 2 and 20 ppm.   
     
     
         6 . The manganese dry battery of  claim 1 ,
 wherein the zinc has a grain diameter of 100 μm or smaller.   
     
     
         7 . A manganese dry battery comprising:
 a negative electrode zinc can as a battery can made of zinc,   wherein the negative electrode zinc can is formed of a zinc plate formed by quenching melted zinc containing aluminum in a range between 3 and 80 wt % and casting it.   
     
     
         8 . The manganese dry battery of  claim 7 ,
 wherein the zinc has a grain diameter in a range between 0.01 and 1 μm.   
     
     
         9 . The manganese dry battery of  claim 7 ,
 wherein a content of the aluminum is in a range between 19 and 25 wt %.   
     
     
         10 . The manganese dry battery of  claim 9 ,
 wherein the zinc has a grain diameter in a range between 0.01 and 0.05 μm.   
     
     
         11 . The manganese dry battery of  claim 7 ,
 wherein the negative electrode zinc can is formed of a zinc plate formed by quenching the melted zinc at a quenching rate in a range between 50 and 200° C./second and casting it.   
     
     
         12 . A negative electrode zinc can for a manganese dry battery, essentially consisting of zinc,
 wherein an added element other than zinc is yielded at a grain boundary of the zinc.   
     
     
         13 . The manganese dry battery of  claim 12 ,
 wherein the added element is at least one element selected from the group consisting of Pb, Bi, Ca, Mg, Si, Al, and In.   
     
     
         14 . A negative electrode zinc can for a manganese dry battery, essentially consisting of zinc,
 wherein the negative electrode zinc can is formed of a zinc plate formed by quenching melted zinc containing aluminum in arrange between 3 and 80 wt % and casting it.   
     
     
         15 . The negative electrode zinc can of  claim 14 ,
 wherein the zinc has a grain diameter in a range between 0.01 and 1 μm.