Page 196 - Battery Reference Book

13/4 High-temperature thermally activated primary reserve batteries

the current density performance is at least 15 times internal resistance remains constant for the discharge
better than with CdCaCr04, for discharge densities duration to 80% of mean voltage, with a value
of over 2-3 min, and analysis of the discharge curves of 0.09-0.1 1 a. The batteries tested after initial
also shows that the energy density achieved by the cell conditioning at f50"C activate in approximately 1.6 s
(including pyrotechnic) is 113 W hJkg, with 63 W hkg giving 12.8A at 25.5V, and those conditioned at
for the battery. The volumetric energy density of the -30°C in approximately 3.0s. The battery design
battery is 113 W h/dm3. uses anodes with excess coulombic capacity (380 A
A further battery design gives a duration of minimum) and considerable improvement in activation
7min, a short activation time and a low internal time is possible if these are matched to the rated
resistance for good voltage regulation for a wide cathode capacity of 200 A minimum.
range of current drains. It uses two parallel stacks of Various other battery designs to meet particular
75 mm nominal diameter cells, housed in a container requirements are available from Mine Safety Appli-
89mm in diameter and 190mm long. The battery ances, who claim that these batteries have a wide
weight is 2.9kg. At an average discharge current range of possible military uses. Designs optimized
of 20A (0.23A/cm2 electrode current density), 8min for maximum energy can achieve energy densities
discharge duration is obtained to 80% of the maximum up to 1OOWhkg and power densities of up to
voltage for both conditioning temperatures. The battery 1500Whkg.