|Lantern with the battery of air-aluminium fuel cells and krypton light source|
The lantern-projector is intended for individual local illumination under field conditions (in the areas which do not have centralized power supply) and requirement of quick charge of device (2–3 minutes). The lantern consists of two parts: a lantern with krypton lamp with power 4.5 W (light source) and air-aluminium battery. The lantern-projector with 4 “dry” batteries R20 as power supply is upgraded for the purpose of their replacement (batteries R20) by the air-aluminium power supply which is easily fastened to the lantern part. Lanterns with air-aluminium batteries, also as well as with “dry” elements can quickly be recharged. Air-aluminium batteries are recharged easily and quickly even under field conditions by replacement of electrolyte and/or anode plates in contrast of “dry” batteries (R20) which are thrown out after exhaustion of their resource. The battery capacity is 90 А·h, voltage is 6 V. The work time till electrolyte changeovere is 8 h, the number of electrolyte changeover before anode renewal is 12. The battery life time is 10 000 hours in mode of energy generating and is more than 20 years in storage mode without electrolyte. The overall dimensions of the battery are 7.5x10.3x15.2 cm (WxDxH), battery weight with anodes is 0.6 kg. The lantern weight with the battery filled by electrolyte is 1.4 kg, its overall dimensions are 12x19x25 cm.
Replacement of “dry” elements by the air-aluminium battery allows to reduce the lantern weight and energy unit cost. So 4 alkaline elements of type Duracell LR20 provide the continuous work of krypton lamp during 8 hours. The weight of elements is 560 g, their total cost in Russia is 140 rubles. Thus energy cost is 3.9 rubles per W·h.
For power supply of the same krypton lamp during 8 hours by air-aluminium battery it is necessary 0.4 l of water, 45 g of sodium chloride salt and 10 g of aluminium alloy. The cost of spent components (water, salt, Al-alloy) does not exceed 1.7 rubles, of energy unit: 0.04 rubles per W·h. Battery cost at mass production will be no more than 250 rubles.