As shown in FIG. 4, the other end of the negative electrode tab 17 has a strip shape and is electrically connected to each of a plurality of portions of the negative electrode 3 located on the upper end face of the electrode group 1. Although not illustrated, similarly, the other end of the positive electrode tab 16 has a strip shape and is electrically connected to each of a plurality of portions of the positive electrode 5 located on the upper end face of the electrode group 1.
Referring to FIG. 3, the sealing plate 10 made of a metal is fixed to the opening portion of the metal container 2 by welding or the like. The positive electrode side leads 22 and the negative electrode side leads 23 are extracted to the outside from outlet holes provided in the sealing plate 10, respectively. On the inner surfaces of the outlet holes of the sealing plate 10, positive electrode gaskets 18 and negative electrode gaskets 19 are arranged to avoid a short circuit caused by contact between the positive electrode side leads 22 and the negative electrode side leads 23. When the positive electrode gaskets 18 and the negative electrode gaskets 19 are arranged, the airtightness of the rectangular secondary battery 100 can be maintained.
