X 0 Secondary Power System Battery LithiumIon AAE

X 0 Secondary Power System Battery (Lithium-Ion) AAE 450 Spring 2009 Jeff Knowlton-Power System

Lithium-Ion Battery (Lith-ion) Lander Rover § Two 28 v 8 Ah batteries § 448 Watt-hours § 1. 54 kg Each 7. 72 kg for battery assembly (housing, heater, …) § Size dictated by Mars Rover (set as max for X 0) § One 28 v 8 Ah Battery § 224 Watt-hours § 1. 54 kg battery 3. 86 kg for battery assembly (battery, housing, heater, …) § One half mars rover specs § Cannot complete lunar mission without recharging AAE 450 Spring 2009 Jeff Knowlton-Power System

Previous Mission Candidate Li-ion Li-Poly Super Ni. Cd Ni. MH Sodium. Sulfur H 2/O 2 RFC Wh/Kg 130 150 (145)* 50 65 120 75 Wh/l 200 300 (358)* 115 200 250 50 >10 k >3 k >2 k Cycle Life >10 k >100 >45 k Used in Space Since 2000 Not yet used Since 1990 Dev. Stage Active Used in 30+ spacecraft Experime Not yet ntal flights used Used in 2 spacecraft Inactive Purposed for ISS Patel, Mukund R. , Spacecraft Power Systems, CRC Press, New York, 2005 p. 252 *Current battery capabilities courtesy of Yardney AAE 450 Spring 2009 Jeff Knowlton-Power System

-Mars Rover gets at best 900 W-h per 24 h 37 min -Maximum of 40 m per day -Gives roughly. 044 m/W-h -Need 11250 W-h for 500 m -Need 77 kg battery or solar panels to recharge the battery AAE 450 Spring 2009 [Name] [Group]