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