Page 125 - Battery Reference Book

Nickel-cadmium secondary batteries 4/9
Cylindrical cells with mass electrodes (Varta D
1.2Ah cell 12A
2Ab cell 14A series)
4Ah cell 28 A These cells are available from Varta. They are phys-
7Ah cell 35 A ically equivalent to primary cells and are suitable for
l0Ah cell 80A
either one- or two-cell operations. These cells are suit-
Short-duration peaks (maximum power) can be able for comparatively low rates of discharge where
obtained (300 ms at 0.65 V/cell), typically: good charge retention is important. They are suitable
for a continuous discharge up to 10 times nominal
1.2Ah cell 93A discharge rate.
2Ah cell 93A
4Ah cell 145A Cylindrical cells with sintered electrodes (Vararta RS
7Ah cell 170A series)
1OAh cell 250A
These cells are suitable for applications where a high
Cylindrical cells and batteries are designed for use in rate of discharge, or operation at extremes of temper-
applications that require good high rates of discharge ature, or permanent trickle charge or fast charging is
performance (continuous and peak). Due to their low required. The cells are constructed from rolled sintered
internal resistance. higher discharge currents can be positive and negative plates, separated by a highly
drawn and also substantially better voltages than apply porous separator which absorbs all the free electrolyte
in the case of cells available a few years ago. within the cell. A safety vent is incorporated within
SAFT also produce the VX series of cylindrical each cell to enable gas, which may build up under
cells (Table 4.6). These have the same characteristics fault conditions, to be released. Batteries containing
as those of the standard VR range. The VX cells RS cells are available either in standard formats or
have the novel conception of a plate which improves designed for specific applications.
the recombinatioin of oxygen produced on overcharge.
They may thus be charged or overcharged at higher
rates than those for standard VR cells. VX cells have 4.1.5 Nickel-cadmium rectangular cells
a smaller capacity than the corresponding standard
cells (about 50%:) but the power characteristics are Rectangular or prismatic cells offer the highest capac-
the same. ities within the sealed nickel-cadmium range, and in

Table 4.6 Sealed cells supplied by SAFT
Serial No. TyDe Equivalent Rated Maximum Maximum Maximum discharge Maximum
primary capacity dimensions (mm) weight rafes (A) power
battery
C5 (Ah) Heipht Diameter (g) Continuous Pulse
VR 0.1 L'3AA R6 0.100 17.4 14.5 il 1.5 15 I0
1.2 Vlcell 0.45 Il2A 0.450 28.1 17.3 21 4.5 31 20
0.5 AA R6 0.500 50.2 14.5 24 5.0 24 16
0.7 L'2C 0.700 26.2 26.4 39 7.0 46 7
1.2 RR 1.2 42.1 22.7 51 12 93 1.2
1.8 c: R14 1.8 49.7 25.9 77 14 93 -
2.5 2/3D 2.5 43.5 32.9 105 20 120 78
4D R20 4 60.5 32.9 150 28 145 95
7F 7 91.3 32.9 240 35 170 110
10 SIF 10 89.2 41.7 400 75 280 170
vx AA R6 0.200 50.2 14.5 21 5 24
RR 0.500 42.1 22.7 45 12 93
c R14 0.700 49.7 25.9 70 14 93
D R20 1.6 60.5 32.9 135 28 145
VRE 1 RR 1 .o 43.2 23.2 49 9 70
1.6C 1.6 48.8 26.4 74 11 70
3.5 r) 3.5 59.2 33.4 150 18 92
6F 6.0 90.0 33.4 240 24 123
VRS D 3.5 64.8 33.1 174 11 -
F 6.0 93.8 33.1 270 18 -