Patent ID: 8409753
Filing Date: 2013-04-02
Classification: H01M,Y02E,Y02P

Abstract:
1. An alkaline storage battery comprising: an electrode group fabricated by rolling a positive electrode using nickel hydroxide as a main positive electrode active material and a hydrogen storage alloy negative electrode using a hydrogen storage alloy as a negative electrode active material into a spiral form with a separator keeping the two electrodes apart interposed therebetween; an alkaline electrolyte; and an outer can containing the electrode group and the alkaline electrolyte inside thereof; the hydrogen storage alloy negative electrode being formed in a strip form including a long axis and a short axis, in which a ratio (A/B) of a length A (cm) of the long axis to a length B (cm) of the short axis is 20 or more and 30 or less (20≦A/B≦30), a ratio (X/Y) of an electrolyte mass X (g) retained in the hydrogen storage alloy negative electrode to an electrolyte mass Y (g) retained in the separator being 0.8 or more and 1.1 or less (0.8≦X/Y≦1.1); the hydrogen storage alloy negative electrode including a hydrogen storage alloy used as a negative electrode active material, an adhesive paste made of a thermoplastic elastomer, and a carbon conductor; a ratio Z (m the hydrogen storage alloy includes a component A composed of elements including at least a rare earth element and magnesium, and a component B composed of element(s) including at least nickel but excluding manganese and cobalt; and the hydrogen storage alloy has A wherein surface area Z (m