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Aircraft Battery 20GNG40(24V/40Ah) substitution of Russian aviation battery K-8 aircraft Russian Mi-17/171

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Air craft Battery

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Aircraft Battery 20GNG40(24V/40Ah) ,

substitution of Russian aviation battery K8 aircraft,

Russian Mi-17/171

Aircraft Ni~Cd Battery

Operation & Maintenance Technical ManuaI

Aircraft Battery 20GNG40(24V/40Ah) , substitution of Russian aviation battery K-8 aircraft, Russian Mi-17/171 1

1 Application

Ni-Cd aircraft battery is used as the boarding standby power supply for the airplanes. In case of breakdown, it can start the engine directly and provide 24V DC power. The battery can be stored at the temperature of -55 °C 〜+60 °C for a short period, and after being charged at 25°C±10°C, the battery can be operated in high altitude of 18000m (11.1852mile) , supplying power at the temperature of -10°C 〜+50°C.

2 Construction and electrochemical processes

2. 1 Construction

The battery is consisted of 20 sintered Ni-Cd cells which are connected in series by nickel plating linlcers and they are mounted in a stainless steel case which has a rigid construction and high mechanical strength. There is special electrical equipment outside the case in convenience of linldng with the electrical connector on the airplane. It can assure flying safe and reliable.

A single cell is consisted, of positive and negative electrodes, separator, terminal post₅ cell container and cover. Heat platewelding technique is used for sealing. The electrolyte is KOH solution with a density of 1.25g/cm³ (78 lb/ft³) (includes 30g/L,.^ i (1.8721b/ft³ )LiOH). An operating vent plug is in the cover. The polarities are identified by a red and a blue plastic washer relatively.

2. 2 Electrochemical processes

The Ni-Cd batteiy has a positive electrode made of nickel hydroxide compound as active material while a negative electrode is of cadmium compound. Potassium hydroxide solution is used as its electrolyte. During charge and discharge process, the following reactions take place:

(Positive side) ,Ni(OH)₂+ OH" (Negative side)	(Charge) ► NiOOH + H₂O+ e (Discharge)
% ■ X	(Charge)
' Cd(OH)₂+2e	► Cd + 2OH-
	(Discharge)

(Overall)(Charge)

2Ni(OH) + Gd(OH)2L (5e) 一”,

In the overall reaction above, it is clearly teen that the water is releasing during charge and absorbing during discharge. So the electrolyte level has changes all the time.

Technical parameters and electr ical performance

2. 1 23 °C ± 5 °C D is charge performance(Reh Table 1)

Battery capacity(Ah)	Standard charge		0.5It 0.5 It A discharge			UtA 1 ItA discharge
Battery capacity(Ah)	Current (A)	Time (h)	Current (A)	Time (min)	End Volt (V)	Current (A)	Time. (min)	End Volt (V)
43	10.5	6	21.5	>2	20	43	>60	20
40	10	6	20	>2	20	40	>60	20
36	9	6	18	>2	20	36	>60	20
28	7	6	14	>2 .	20	28	>60	20
27	7	6	13.5	>2	20	27	>60	20
25	5	7	12.5	>2	20	25 '	>60	20
18	4.5	6	9	>2	20	18	>60	20
15	4	6	7.5	>2	20	15	>60	20 .
5.5	1.5	6	2.75	>2	20	5.5	>60	20

It—means the, battery nominal capacity. So 0.5 ItA is equal to 0.5x I_tA. Take 20GNC40 as an. example, the nominal capacity is 40A, then 0.5 ItA is 20A.

In order to make sure the performance/ the best operation temperature is 23°C±5°C.

More aircraft models for your choice:

Model	Capacity(Ah)	Rated Voltage(V)	Dimensions			Max. weight with electrolyte (Kg)/(lb)
Model	Capacity(Ah)	Rated Voltage(V)	L(mm)	w(mm)	H(mm)	Max. weight with electrolyte (Kg)/(lb)
20GNC43	43	24	413	210	268	37.2/82.0120
20GNC40<6)	40	24	496	175.5	229	38/83.7757
20GNC40	40	24	413	210	268	37.2/82.0120
20GNC40 (K8)	40	24	414	218	266	37.2/82.0120
20GNC40 (教八)	40	24	414	218	266	37.2/82.0120
20GNC40C	40	24	424	210	268	37.2/82.0120
20GNC40F	40	24	302	274	263	37/81.5710
20GNC40H	40	24	303	307	263	37.2/82.0120
20GNC40K	40	24	417	220	268	40/88.1849
20GNC36	36	24	413	210	268	37/81.5710
20GNC28	28	24	480	194	269	30.5/67.2410
20GNC27	27	24	413	210	220	29/63.9341
20GNC25	25	24	370	176.5	229	26.3/57.9816
20GNC25(mi)	25	24	474	210	246	28/61.7294
20GNC25D	25	24	345	220	225	25/55.1156
20GNC18	18	24	305	230	178	19/41.8878
20GNC16	16	24	370	119	203	17.5/38.5809
20GNC15	15	24	292	169	207	17.75/39.1321
20GNC5.5	5.5	24	293	173	136	8/17.6370