A unit cell (cell) of a nickel-zinc battery, which has reliably isolated positive and negative electrodes by a hydroxide ion conductive separator therein, is provided in the form of a cell pack that has excellent handling properties and is extremely advantageous in the assembly of a battery pack. This nickel-zinc battery cell pack is provided with: a flexible bag body formed with a flexible film;a middle partition sheet that is bonded in a liquid-tight manner to the inside of the flexible bag body and defines a positive electrode chamber and a negative electrode chamber so as to not allow liquid communication; a positive electrode and positive electrode electrolyte that are accommodated in the positive electrode chamber; and a negative electrode and negative electrode electrolyte that areaccommodated in the negative electrode chamber. The middle partition sheet is provided with a separator structure that includes a separator that has hydroxide ion conductive properties but does not have water-permeable properties.