Negative electrode for a rechargeable nickel-hydrogen battery and a rechargeable nickel-hydrogen battery that uses the same

摘要

A negative electrode for a rechargeable nickel-hydrogen battery, which is a negative electrode (26) in the form of a band that forms a group of electrodes (22) with a positive electrode (24) and a separator (28), which it is contained in an external can (10) of a rechargeable nickel-hydrogen battery (2), the negative electrode (26) of a core body (60) being formed and a negative mixing layer that covers both sides of the body of core (60) and contains a large number of hydrogen storage alloy particles, comprising: a main section (56), both sides of which face the positive electrode (24) with the spacer (28) intercalated between them as it is seen in a rolled state where the negative electrode (26) forms the group of electrodes (22) with the positive electrode (24) and the separator (28) and an protruding region protruding from one end of the main section (56 ) in a winding direction and faces the positive electrode (24) with the spacer (28) sandwiched between them only with one side, where: the hydrogen storage alloy particles contained in at least a part of the projecting region have an average diameter greater than an average diameter of the hydrogen storage alloy particles contained in the main section (56), characterized in that the hydrogen storage alloy particles contained in the projecting region have a filling density lower than that of the hydrogen storage alloy particles contained in the main section (56).