using (lifepo4) lithium iron phosphate batteries in aviation engine starting batteries
TRANSCRIPT
Using (LiFepo4) Lithium Iron Phosphate Batteries
in Aviation
Engine Starting Batteries
Destructive Testing
Why is LiFePo4 safe ?
Impedance Values .. 19 mohms
10.5mohms
Low Impedance .. 10.8 mohms
SLA discharge curve low C-rate
Lithium discharge curves, hi C rate
Energy Densities
Watthours / kg – Watthrs / Liter
Rogone plot - energy storage
Energy Release / chemistry type Exothermic volatilty
Lithium cells - LiFePO4
Lithium can safety valve
See-thru clear case design
BMS
Balancing circuit
Balancer circuit
Charge display
Low V alarm , LVC circuit
ADVANTAGES• Much less weight• Smaller size• Flatter discharge curve• Very low self discharge rate• Very long cycle life• Deep cycle ability• No maintenance needed• Cheaper than lead acid in the long run• Environmentally friendly
Current users; Turbine
PT6-20 in Lancair IV
PT6 start - peak A draw, V drop
PT6 300A generator
Turbine Start Data, Lithium 18lbs
Charging Data > start
Piston; IO550 , Lithium 4 lbs
REFERENCES• Dynalab Wikipedia• A123 MIT• Battery university Goodenough UT• Electropedia Aleees• Phostech Ti Sandia Labs