To improve rigidity of a secondary battery having an electrode laminated body in which a positive electrode plate and a negative electrode plate are laminated alternately through a separator.
The secondary battery 10 comprises the electrode laminated body 101 in which the positive electrode plate 102 and the negative electrode plate 104 are laminated alternately through a separator. The positive electrode plate 102 has a positive electrode layer 102b including a positive electrode active material formed on a main surface of a positive electrode side collector 102a. The negative electrode plate 104 has a negative electrode layer 104b including a negative electrode active material formed on a main surface of a negative electrode side collector 104a. The positive electrode plate 102 and the negative electrode plate 104 have rigid parts 102c, 104c formed by bending at least one side of each periphery of the positive electrode plate 102 and the negative electrode plate 104, like nearly wavy shape.
Hitoshi Maeda
Koichiro Okura
Miki Sato