The appts has a first control valve (1) which is provided at a heating gas supply pipe line, control the fuel flow rate. A second valve (5) which is provided at a heating gas exhaust pipe line controls the differential pressure of a fuel pole. A third valve (8) which is provided at an air supply pipe line controls the air flow rate. A fourth valve (12) which is provided at an air exhaust pipe line controls the differential pressure of an air pole. A fifth valve (15) which is provided at a nitrogen supply pipe line controls the nitrogen flow rate. A sixth valve (16) provided at a nitrogen exhaust pipe line controls the pressure of battery body. A seventh valve (2) which is provided at the pipe line connected to the downstream of the first valve and upstream of the fifth valve controls the supply of nitrogen to the fuel pole. An eighth valve (9) which is provided at the pipe line connected to the downstream of the third valve and upstream of the fifth valve controls the supply of nitrogen to the air pole. A ninth valve (3) which is provided at the pipe line connected to the downstream of the fifth valve and downstream of the first valve balances body and fuel pole pressure. A tenth valve (10) which is provided at the pipe line connected to the downstream of the fifth and third valves balances the body and air pole pressure. A eleventh valve (6) which is provided at the pipe line branching to the upstream side of second valve and is in contact with atmospheric air adjust the differential pressure of atmospheric air and fuel pole. A twelfth valve (13) which is provided at the pipe line branching to the upstream side of the fourth valve and is in contact with atmospheric air adjust the differential pressure of atmospheric air and air pole. The boosting operation of fuel pole, air pole and body and equalising operation before starting gas and air supply. A body fuel pole equalising valve (4) has a diameter smaller than that of the ninth valve. A body air pole equalising valve (11) has a diameter smaller than that of the tenth valve.    ADVANTAGE -   Introduces heating gas and air smoothly. Eliminates necessity of UPS, thus enabling size and cost reduction.