Lead-acid storage battery

A lead-acid storage battery comprising positive plates and pasted negative plates, which are alternately arranged so that one of said positive and negative plates is disposed between the other of said plates, and insulating separators each being disposed between the adjacent positive and negative plates, characterized by that each of said positive plates comprises a substrate having at least spaced longitudinal members of electrically conductive material with first and second outer surfaces of said spaced longitudinal members being substantially in first and second planes;

• pasted active material filled in said substrate substantially to the level of said first and second plane, respectively;
• and an active material holder including porous insulating sheets mounted on both sides of said active material, said insulating sheets each having an inner surface lying substantially in said first and second planes, respectively, and substantially engaging said outer surfaces of said spaced longitudinal members, a plurality of longitudinal partitions of insulating material secured to said inner surfaces of said porous insulating sheets and interleaved with said longitudinal members, said plurality of longitudinal partitions extending inwardly from said inner surfaces and being embedded in said active material so as to effectively subdivide the active material into smaller active material portions, and whereby the said partitions and porous insulating sheets are effective in holding more securely the active material on the substrate during charge and discharge of the battery.