Page 341 - Battery Reference Book

30/12 Primary batteries

1 r-T I I I1 I Illllllll I I I I I I I I IIllIll]ll
1 2 3 4 5 6 78910 20 30 40 50 607080 100
Hours of service
Figure 30.29 Effect of ohmic load on service life of Mallory alkaline manganese dioxide 1.5V primary cells at 20°C on constant resistance
load (Courtesy of Mallory)

r
36

p 18
s 12
ot 1 I I 1 I 1 I I I I I II,I/I
15 20 30 40 50 60 70 8090100
Service time Ih)
Figure30.30 Effect of ohmic load on service life of Duracell
Rmi2R mercury-zinc 1.35 V primary batteries at 20°C on constant
resistance load, 3600mA to 0.9V on 25Q (Courtesy of Duracell)
Ot -& -19 -I8 -I6 k4 +15 +:6
Temperature ("C)
Figure 30.32 Eagle Picher remotely activated primary silver-zinc
battery: effect of temperature on capacity at constant discharge
(Courtesy of Eagle Picher)
2
0
1 2 34567810 20304050 100 service time achieved as a percentage of service time
Service time (h) obtained at 20°C versus temperature provide similar
(a) L0.26, 10.0 A h information.
Silver-zinc primary batteries
Figure 30.32 shows the effect of temperature on avail-
able capacity for silver-zinc cells and batteries.
p 120
Lithium-sulphur dioxide batteries
40 -30 and f52 OC
The available capacity of this type of battery as a
1 2 3 4 5 678 10 20 30 50-70100 function of temperature and ohmic load is shown in
Service time (h) Figure 30.33. Applications in which this system has
(b) L0.32, 1.1 Ah, end voltage 2.0 V
been particularly valuable are those demanding high-
Figure 30.31 Typical ohmic load-service life performance of Mal- rate operation at temperatures down to -40°C. Results
lory primary lithium-sulphur dioxide cells on constant resistance covering the current range from lOmA to 1 A and
load (Courtesy of Mallory) the temperature range +60 to -23°C are quoted in
Table 30.1.
versus the battery capacity obtained to the end-point It is interesting to note from the results quoted
voltage at that temperature expressed as a percentage in the table that full nominal capacity is realized at
of the battery capacity obtained at a standard battery 24°C regardless of load and that at lOmA load full
temperature, usually 20 or 21°C. Alternatively, plots of nominal capacity is realized regardless of temperature.