Nickel-metal hydride secondary cell.

摘要

A nickel-metal hydride secondary cell comprising an enclosure (4), a non-sinter type nickel positive electrode (1) accommodated in the enclosure (4) and formed of a conductive core and a layer formed on the core and made mainly of a binding medium, nickel hydroxide powder, and cobalt monoxide powder, a hydrogen absorbing alloy negative electrode (2) accommodated in the enclosure (4) and formed of a punched metal and a layer formed on the punched metal by applying a paste thereto, the punched metal having a plurality of apertures having a diameter of 1 to 5 mm at an aperture rate of 45 to 70% and having a thickness equal to 10 to 35% of the overall thickness of the negative electrode, and the paste made of 100 parts by weight of hydrogen absorbing alloy powder, 0.005 to 1 part by weight of polyacrylate, 0.01 to 1 part by weight of carboxymethylcellulose 0.5 to 7 parts by weight of fluororesin, and 0.1 to 4 parts by weight of conductive material powder a separator (3) made of synthetic resin unwoven fabric and located between the positive and negative electrodes(1, 2), and an alkali electrolyte contained in the enclosure (4).