Battery

摘要

A battery (100) is adapted such that a nickel hydroxide particle group (163g) constituted of a number of nickel hydroxide particles (163) filled in a void part (K) of a positive electrode substrate (161) contains, at a ratio of 15 wt% or less, small-diameter nickel hydroxide particles (163b) each having a particle diameter of 5 µm or less. The positive electrode substrate (161) is configured such that a front-surface-side nickel layer (162b) and a back-surface-side nickel layer (162f) are made larger in thickness than a middle nickel layer (162d), and an average thickness B of either the front-surface-side nickel layer (162b) or the back-surface-side nickel layer (162f), which is thicker one, and an average thickness C of the middle nickel layer (162d) satisfy a relation of C/B ‰¥ 0.6.