Page 590 - Battery Reference Book

51/28 Nickel batteries
1200 c

ot I I I I I I 1
-20 -10 0 10 20 30 40 50
Temperature ("C) Figure 51.20 Terminal arrangements for Nife Jungner KR series
sealed nickel-cadmium cells. The cells are available with three
Figure 51.18 Effect of temperature on capacity of Eveready different terminal arrangements; HH, HB and CF. Types HH
BHI and BHlT sealed nickel-cadmium button cells, 12V, 1 Ah (head-head) and HB (head-base) are equipped with soldering
capacity, discharge current 100 mA (Courtesy of Union Carbide) tabs. Type CF (connection free) is equipped with a contact button
on top, similar to dry cells (Courtesy of Nife Jungner)
Figure 51.20). This method, however, is suitable only
for low loads. For high loads, and when high reliability cells have an acceptably low rate of self-discharge.
is of great importance, cells with soldered or spot- Self-discharge is very much dependent on the temper-
welded soldering tabs are recommended. Battery packs ature, and increases rapidly with rising temperature.
made up of between two and 20 cells are available. At very low temperatures the self-discharge is small,
The characteristics of the Nife Jungner KR series and is almost zero at -20°C. These cells and batteries
of cells (0.4-5.6Ah) are given in Table 51.30. These can be stored in the charged or discharged condition.

- 7.0 - 7.0r
\
6.0 2 6.0
P
100 mA 50 mA 2 5'5 2 A 500 mA 250 mA
5.0 5.0 , I , ,
,
6
: 2 4.5 ., 5 b, , , I , m 4.5 , , I
0 2 4 6 8 101214 0 20 40 60 80 100 120 140
Discharge time (h) Discharge time (min)
(a) Type HS4172.6 V, 0.5 A h

450 mA
t 5.5
180 mA
2 4.5
0 2 4 6 8 10 12 14 0 20 40 60 80 100 120 140
Discharge time (h) Discharge time (mid
(b) Type N67, 6 V, 0.9 A h
-
>
W m
6.0 - -
g
'
5.5 240 mA 20 mA G 5.0 i y m ;
z 5.0 5
2 4.5 4.5
0 2 4 6 8 1 0 12 14 0 20 40 60 80 100 120 140
Discharge time (h) Discharge time (min)
(c) Type N91, 6 V, 1.2 A h
Figure 51.19 Typical discharge curves at 20°C for Eveready sealed nickel-cadmium cylindrical batteries: see Table 51 29 (Courtesy of
Union Carbide)