The invention relates to an ignition device for a pyrotechnic occupant protective system which contains an ignition unit, an ignition switch and an electronic unit. A distal end of the retractable shaft includes a bit holder for holding a bit. The inside diameter of the annular chamber is slightly greater than the diameter of the cylindrical component. Based upon this measurement, the concentration of the solution may be adjusted. It is preferable that the anode active material layer is alloyed with the anode collector on at least a part of interface between the anode active material layer and the anode collector.