Page 578 - Battery Reference Book

51/18 Nickel batteries

Table 51.21 Varta sealed nickel-cadmium batteries: recommended conditions of temperature during charge, discharge and storage
Charge temperature (“C) Discharge temperature (“C) Storage temperature (“C)
Recommended Possible Recommended Possible Recommended Possible
D, DK and DKZ cells with mass plate electrodes
10 to 35 0 to 45 0 to 45 -20 to +50 0 to 45 -40 to +50
At temperatures below 0°C Up to 60°C for a maximum of 24 h
maximum discharge rate 5 5Clo
(5 x 110) for DK and 5 lC10 (lox
110) for DKZ
Up to 60°C for a maximum of 24h
RS and SD cells with sintered electrodes
10 to 35 -20 to +50 -20 to +45 -45 to +50 0 to 45 -45 to f50
At temperatures below 0°C Up to 60°C for a maximum of 24 h Up to 60°C for a maximum of 24 h
charge current limited to 4110
with a voltage limit of 1.55 Vlcell
~

g E 20
2 0 2 4 6 8 10 12 14 16 18 20
w
Discharge rate (X I,o)
(a) III I I I I I I I I I,
I, 10 20 30 40 50
Discharge rate (X I,,)
(a)

0 2 4 6 8 10 12 14 16 18 20
Discharge rate (X I,,) 2 x I,,
’ 0.9
(b) 0°C 0 1 2 3 4 5 6 7 8 9 10
Time (h)
- Start (b)

m m 1.1 -Average
Y -
so.9t TI I ,<I Final I I I
0 2 4 6 8 10 12 14 16 18 20
3 0.9
Discharge rate (X I,o) 0 10 20 30 40 50 60 70 80 90 100
(c) -20-c Time (min)
(C)
Figure 51.5 Capacity and voltage versus discharge rate for fully
charged Varta sealed nickel-cadmium roiled sintered cells up to Figure 51.6 Discharge curves at various rates of fully charged
2 Ah (Courtesy of Varta) Varta sealed nickel-cadmium rolled sintered cells up to 2Ah.
Starting voltage approx. 30 min after end of charge, initial voltage
after 10% of discharge capacity, average voltage approx. 1.22V,
final voltage approx. 0.99V. (b,c) Voltage during discharge below
recommend the use of the Mempac 100 DKO battery. 1 V (Courtesy of Varta)
This is rated at lOOmA h at the 10 h rate. However, at
the discharge rates required for most memory support
applications (possibly only a few hundred microamps), Figure 51.7 shows voltage characteristics for the
significantly greater capacity will be available. Mempac cell when discharged at the 10 h rate O.lCloA