Page 402 - Lindens Handbook of Batteries

LiTHiUM PriMAry BATTerieS 14.67

FIGURE 14.64 Discharge characteristics of Li/CFx coin-type battery (165 mAh size). (a) Operating
voltage vs. discharge load; voltage at 50% discharge. (b) Capacity vs. discharge load; cutoff at 2.0 V.
(Courtesy of Panasonic Corp. of North America.)

The performance of the coin battery (165 mAh capacity) is summarized in Fig. 14.64. Figure
14.64(a) shows the average load voltage (plateau voltage during discharge) and Fig. 14.64(b) shows
the capacity for discharges at various loads and temperatures.
Figure 14.65 summarizes the discharge performance data for Li/CFx coin-type batteries normal-
ized for a 1 g and 1 mL battery. These data can be used to approximate the size or performance of a
battery for a particular application.
Cylindrical Cells. The cylindrical batteries are designed to operate at higher discharge rates than
the coin batteries. Figure 14.66 presents the discharge curves on a 1 kohm load at several tempera-
tures. in some cases, an initial low voltage is observed with the Li/CFx battery; that is, the voltage
drops initially below the operating level on load and recovers gradually as the discharge progresses.
This is attributed to the fact that CFx is an insulator, but the resistance of the cathode decreases dur-
ing the discharge as conductive carbon is produced.