Page 589 - Battery Reference Book

Nickel-cadmium secondary batteries 51/27

1.4 r
7 1.3
7 1.3
I
I
& 1.2
& 1.2
m
m
-
-
I
I
p
p 1.1
- - 1.1
-
-
8 1.0
8 1.0
0.9
0.9
3
0 0 1 1 2 2 3 4 4 5 5 6 6 7 8 9101112
7 8
9101112
I l l l l l l l l l l l
Discharge time (h) 14 15 16 17 18 19 20 21 22 23 24 25 26
1.4 Charging time (h)
Figure 51.15 Sample discharge data for fully charged Eveready
OB90 and OB90T sealed nickel-cadmium cells, 1.2V, 90uAh
capacity. (Charge voltage 1.35-1.5Ov) (Courtesy of Union Car-
bide)
0.9 0 L 20 40 60 80 100 700
!.O
A120
.
' 600r
A
Discharge time bin)
E 500
100 r c
>
'p 400
a
;
300
0 400 800 1200 1600 2000 2400
Discharge current (mA)
- Y"
Figure 51.16 Typical capacity versus discharge current curves
' 501 ... for Eveready CF500, CFSOOT, CH500 and CH500T sealed
0L-f 1 1 1 I I 1 1 1 ~ I I nickel-cadmium cylindrical cells, 1.2V, 0.5A h capacity (Courtesy
0 10 20 30 40 50 60 70 80 90 100 110120 of Union Carbide)
Discharge current (mA)
Figure 51.13 Sample discharge data: average performance char- 600 r
acteristics of Eveready OB90 and OB90T sealed nickel-cadmium 500
cells, 1.2 V, 90 pA h capacity, at 21 "C. Example: assume a 35 mA
discharge to a 1.1 V end-point. The OB90 (or OB9OT) cell has 2 400 0.9 v
a capacity of 70 rnA h. This provides a discharge time of 2 h 1 1.0 v
.- ,Z 300
(Courtesy of Union Carbide)
200 1.1 v
-
1OOr
0 200 400 600 800 1000 1200 1400
Discharge current (mA)
Figure 51.17 Typical capacity versus discharge current curves
for Eveready BH500 and BHSOOT sealed nickel-cadmium button
cells, 1.2V, 0.5A h capacity. Ranges of temperature applicable to
operation of the cells are: charge 0 to 45"C, discharge -20 to
I I I I I I I J +45"C, storage -40 to +60"C (Courtesy of Union Carbide)
-30 -20 -10 0 10 20 30 40 50
Temperature ("C)
Figure 51.14 Sample capacity versus temperature curve for N$e Jungner SPA (Italy)
Eveready OB90 and OB90T sealed nickel-cadmium cells, 1.2 V,
20sAh capacity, at 9 mA discharge current. The temperature This company manufactures a range of rechargeable
ranges applicable are 0-45°C (charge), -20 to 45°C (discharge) sealed nickel-cadmium cells in the nominal capacity
and -40 to 60°C (storage) (Courtesy of Union Carbide) range 0.4-5.6Ah. These are available with three
different terminal arrangements; HH, HB and CF
the capacity for a 1 Ah Eveready 1.2V button cell. (Figure 51.20). Each cell has a nomind voltage of
Table 51.29 shows the available types of battery, with 1.25 V. A battery is assembled by series connection
the stated capacity, made up from Eveready cylindrical of a number of cells, which determine the battery
cells. Discharge curves and capacity versus discharge voltage. The simplest way to connect a number of
currents data for some of these batteries are given in cells is to stack them on top of each other as
Figure 51.19. in an ordinary flashlight (terminal arrangement CF,