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SAFT ELECTRIC STORAGE BATTERY Gulfstream Aerospace P/N ...

SAFT ELECTRIC STORAGE BATTERY Gulfstream Aerospace P/N ...

2. Operation (4)

2. Operation (4) Connector Receptacle SAFT AMERICA INC. Component Maintenance Manual 1159SCAV519-1 Main connector receptacle (170) is secured to the box by four Sems screws (190). The temperature sensor/charge control auxiliary connector receptacle is secured to the box by four screws (230) and four locking nuts (240). A. Principle of Operation The battery plates store electrical power supplied by a charging source, and supply power when the battery is connected to a load circuit, i.e. when it discharges. During charge, nickel hydroxide Ni (0H)2 of the positive plates is oxidized and is transformed into superior hydroxide NO O OH; cadmium hydroxide Cd (OH)2 of the negative plates is reduced and is transformed into cadmium metal (Cd). Reverse reactions take place during discharge and active materials return to their initial state. The electrolyte (ternary hydroxide solution) does not undergo any significant chemical change. For a battery with a given volume, the nominal capacity of the battery discharged in 1 hour is determined by the quantity of electricity (Ah) the battery can supply. The efficiency of the battery, in terms of quantity of electricity, is 71.5%. This means that, in order for a 53 Ah battery to supply 100% of its capacity, it must store a quantity of electricity of 74.2 Ah, i.e. 140% of C1 . It is only on this condition that complete chemical transformation of the active materials takes place. 24-34-01 PAGE 6 AUG 30/96

B. Operation in normal use (1) Charging in normal use SAFT AMERICA INC. Component Maintenance Manual 1159SCAV519-1 Charging the battery on the aircraft is ensured by an on board chargers supplied by one (or several) AC generator(s). NOTE: When a battery, in which the active materials have been fully transformed, is subjected to an extended charging operation, the battery becomes overcharged. The current passing through the assembly gives rise to the electrolysis of the electrolyte water into its two elements: oxygen and hydrogen. The rate of decomposition is 1 cm 3 (0.061 cu. in.) of water for an overcharge of 3 Ah. Water consumption in overcharging conditions is therefore proportional. (2) Discharging The nominal capacity C1 of the battery corresponds to the 1 hour rate of discharge; that is, the battery can supply a 53 amp current for 1 hour, when it is at 100% state of charge. However, the battery can, without danger, supply currents greatly exceeding the nominal discharge current. For instance, a battery with a 53 Ah nominal capacity can supply, in peak conditions, currents about twenty times its nominal rating. 24-34-01 PAGE 7/8 AUG 30/96

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