Lithium Iron PhosphateLithium Ferrous Phosphate Lithium FerrophosphateLiFePO, LiFePO4, Li-Iron, LiFe, LFP

*iccnexergy.com. **wikipedia.org

38140S 12Ah lifepo4 battery are the cylindrical EV batteries (38mm x 140mm)10S2P means 2 parallels with 10 in series each (20 cells total)20C/30C means maximum constant discharge rate/Burst discharge rate (<10sec) (for LiFePO there is just one C rating)When combining batteries, the participating batteries must all be identical in voltage and capacity.

**Lithium-Ion Batteries for Off-Grid Systems. HomePower.com

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Discharging:

Charging:

*J. Molenda & M. Molenda, Composite Cathode Material for Li-Ion Batteries Based on LiFEPO4 System., 2011. InTechOpen.com **Lithium-Ion Batteries for Off-Grid Systems. HomePower.com

*BatteryUniversity.com

*BatteryUniversity.com

Energy Density

*gnightearth.com

Energy Density:Size vs. Weight

LFP

Pb-acid

*GliderPilotShop.com

*iccnexergy.com/articles/1256/iron-phosphate-builds-a-better-battery/

Discharge Test 1

*iccnexergy.com/articles/1256/iron-phosphate-builds-a-better-battery/

Discharge Test 2

*iccnexergy.com/articles/1256/iron-phosphate-builds-a-better-battery/

Cycle Life Test

*gwl-power.tumbler.com/post/26696964746/depth-of-discharge-dod-all-battery

Depth of Discharge DoD

*http://www.evamerica.com/fluxpbcellmodule75e.pdf

Discharge Curve1

*http://www.evamerica.com/fluxpbcellmodule75e.pdf

Discharge Curve2

*http://www.evamerica.com/fluxpbcellmodule75e.pdf

Depth of Discharge DoD

*http://www.evamerica.com/fluxpbcellmodule75e.pdf

Self Discharge

• Lower energy density• Still expensive• Cell imbalance during charging

• Thermal runaways• Catastrophic field-failures• Lithium-intensive

• Fast/powerful• Rugged/durable• Stable/reversible• Long-lived• Safer• Cost-effective

• Low voltage drop under load• Predictable end of life• Thermally stable to 300oC• Non-explosive• No oxygen emission

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*BatteryUniversity.com. **www.iccnexergy.com/articles/1256/iron-phosphate-builds-a-better-battery. ***batteryspace.com ****cobox-ebikes.com. *****GliderPilotShop.com

1,000,000 duty cycles10yrs DC life, 4yrs shelfShock/Vibration resistance-40oC to 65oC operationLow charge/discharge temp ∆

4Wh (14kJ), 7.5Wh/kg (energy)

8.0kW/kg (power)

18mA/72hrs (leakage)

0.22mOhms (ESR)

100A cont, 2,000Apeak, 10,000Asc, 3Vmax

Maxwell BCAP34003400F, 2.85V ($55-$71)

*maxwell.com, allaboutbatteries.com

*wikipedia.org

Energy vs.

Power Density