Miniaturized g-and spin-activated Pb/HBF4/PbO2 reserve batteries as power sources for electronic fuzes

• Published in: Journal of power sources Vol. 162; no. 2; pp. 1421 - 1430
• Main Authors: YOON, Sang-Hee, SON, Joong-Tak, OH, Jong-Soo
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier Sequoia 22.11.2006
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Experimental test; Computational fluid dynamics; Bipolar electrode; Power electronics; Activation; Electric batteries; Experimental study; Military application; Reserve power; MEMS; Reserve battery; Miniaturization; Fuze; Performance; Series stack; Cost lowering
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2006.07.051

This paper discusses miniaturized Pb/HBF4/PbO2 reserve batteries (MRB) for military applications as in-flight power sources for small-caliber electronic fuzes, where the setback acceleration and high-spin force in firing environments are used to activate the MRB. The MRB is composed of a series configured 23 bipolar electrodes, an isolated glass ampoule filled with an electrolyte and an internal cutter for breaking the glass ampoule. The MRB is designed to furnish high-voltage electrical energy with a fast activation time in gunfire environments and must have a 20-year shelf life. The electrolyte volume is determined from the simulation results of a CFD program (FLUENT) for reduction in design time and cost. Two kinds of MRBs have been designed and fabricated: MRB-S with one narrow electrolyte-filling microchannel and MRB-D with two. In the experimental study, spin tests under 10,000Xg's and 20,000rpm conditions and a fire test under 43,000Xg's and 57,000rpm conditions have been made. The fabricated MRB with a diameter of 16mm and a height of 13mm has achieved a maximum voltage of 34.6+/-0.4V, an activation time of 8.6+/-0.6ms and a maximum capacity of 37.4+/-0.4Ws at an optimized electrolyte volume of 180mm3. The test results have verified that the activation time of the MRB at a low temperature of -32 deg C can be improved by decreasing the flow resistance of the electrolyte in spite of the decreased ion mobility.