Sealed storage battery having electrode plate foot which rests on a rib and cover joint structure with high adhesive strength

摘要

A sealed lead acid storage battery includes a monoblock container, a cover, plural assembly elements, each assembly element comprising a plurality of positive and negative electrode plates that are stacked via separators in a predetermined direction, a positive and negative electrode strap, and a positive and negative electrode terminal. The positive and negative electrode terminals protrude above the cover. The container further comprises ribs formed inside a bottom surface thereof for enabling the electrode plates to rest on the ribs. Each positive electrode plate has a pair of feet that are formed on a lower end thereof in a substantially symmetrical arrangement and further comprises a lug connected to the positive electrode strap that is disposed at a position shifting either to the left or to the right. One of the feet correspond to the position having the lug not resting on any rib, while the other foot rests on a rib. The storage battery further comprises a projection formed on an end face of the opening of one of the container and the cover and a recess formed in an end face of the opening of the other. The projection is fitted in the recess and bonded thereto via an adhesive. At least either an inner face of the recess or a surface of the projection has a plurality of vertical ribs for defining a space between the surface of the projection and the inner face of the recess.