Page 388 - Lindens Handbook of Batteries

LiTHiUM PriMAry BATTerieS 14.53

FIGURE 14.46 Discharge characteristics of Li/MnO cylindrical bobbin battery
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(850 mAh size) at 20°C. (a) Discharge time in hours. (b) Discharge time in days. (Courtesy
of Duracell, Inc.)

the end of the discharge. The effect of a high pulse load superimposed on a low background current
is shown in Fig. 14.47.
The performance of the Li/MnO cylindrical bobbin battery at temperatures from -20 to 60°C
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is shown in Fig. 14.48. Operation of the coin-type and cylindrical bobbin electrode batteries at the
lower temperatures is limited to the lower discharge rates.
Discharge Characteristics of Cylindrical Spirally Wound Batteries. Typical discharge curves
for Li/MnO cylindrical spirally wound batteries at various constant-current discharge loads
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and temperatures are given in Fig. 14.49. These batteries are designed for operation at fairly
high rates and low temperatures. Their discharge profile is flat under most of these discharge
conditions. The midpoint voltage when discharged at various loads and temperatures, is plotted
in Fig. 14.50.
The characteristics of the batteries under constant power discharge are shown in Fig. 14.51. These
data are expressed in terms of E-rate, which is calculated in a manner similar to calculating the C
rate, but based on the rated watt-hour capacity. For example, the E/5 rate for a cell rated at 4 Wh is
800 mW.
The discharge characteristics of the cylindrical spirally wound Li/MnO battery at various tem-
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peratures and loads are summarized in Fig. 14.52. Fig. 14.52(a) shows the percent capacity delivered
on constant-resistance loads, Fig. 14.52(b) the percent capacity delivered on constant-current loads.