Grid plate for lead acid storage battery, plate, and lead acid storage battery provided with same plate

A grid plate for a lead acid storage battery comprising a frame section having a pair of lateral frame strands that extend in a lateral direction and oppose one another in a longitudinal direction, and a pair of longitudinal frame strands that extend in the longitudinal direction and oppose one another in the lateral direction;

• a plurality of lateral grid strands and a plurality of longitudinal grid strands that are provided so as to extend parallel to the lateral frame strands and the longitudinal frame strands, respectively, so that a grid is formed inside the frame section;
• and a plate lug section integrally formed in one lateral frame strand of the frame section, wherein
• at least one of:
• the longitudinal grid strands or the lateral grid strands, have a plurality of thin strands having a cross-sectional area that can withstand corrosion for a predetermined service life period of the lead acid storage battery, and a plurality of thick strands that have a greater cross-sectional area than that of the thin strands, the thick strands and thin strands being arranged so that the strands adjacent to the thick strands are thin strands;
• the plurality of thick strands have a thickness that is less than the thickness of the frame section, end portions of the thick strands with respect to the thickness direction are positioned further inward in the thickness direction than end face portions of the frame section, respectively, in the thickness direction of the frame section;
• and the thick strands are arranged in a state in which the respective end portions of one end side in the thickness direction are positioned in the same plane;
• the width and thickness of the thin strands are set to be less than the width and thickness of the thick strands;
• and
• the plurality of thin strands are provided in a state in which the respective end portions on one end side in the thickness direction, are positioned in positions closer to the plane in which the end portions of one end side of the plurality of thick strands in the thickness direction are arranged, as opposed to an opposing end side of the plurality of thick strands, but so as not to cross over the plane in which the end portions of one end side of the plurality of thick strands in the thickness direction are arranged.