NOVELTY - A control apparatus (7) controls the switch based on the result obtained by each contrast of these data and determines if the cell voltage data of at least one air cell deviates from the prescribed regulation cell voltage data of the air cell and if the stack voltage data of air cell stack. The control apparatus controls the switch (6) to other air cells adjacent to the cell with the off-voltage reading.    USE - Air cell system for vehicle batteries.    DETAILED DESCRIPTION - Air cell system (1) includes positive and negative electrode layers connected to positive and negative electrode layer tabs respectively, laminated and connected in series, positive and negative electrode side output terminals connected to the positive and negative electrode sides of the air cell stack. A cell voltage meter measures the voltage between the positive and negative electrode layer tabs of each air cell. A stack voltage meter (4) measures the voltage between the positive and negative electrode side output terminals of the stack. A bypass circuit (5) with switch connects the positive and negative electrode layer tabs of its respective electrode side output terminals of each cell. A voltage-regulating cell of each air cell acquires the previous stack voltage data and the stack voltage data input from the cell voltage data and the stack voltage meter inputted from the cell voltage meter. A control apparatus controls the switch based on the result obtained by each contrast of these data and determines if the cell voltage data of at least one air cell deviates from the prescribed regulation cell voltage data of the air cell and if the stack voltage data of air cell stack. The control apparatus controls the switch to other air cells adjacent to the cell with the off-voltage reading.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram of the air cell system.    Air cell system (1)    Stack voltage meter (4)    Bypass circuit (5)    Switch (6)    Control apparatus (7)