 Manufacturer:General Electronics Battery (China)  Supplier: Falcon-EV  “Green Square Cells LiFePO 4 ” – 10Ah, 8C Rated Cont., $39.00  Internal Resistance:<

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Presentation transcript:

 Manufacturer:General Electronics Battery (China)  Supplier: Falcon-EV  “Green Square Cells LiFePO 4 ” – 10Ah, 8C Rated Cont., $39.00  Internal Resistance:< 8mΩ  Discharge Protection Voltage:2.3V  Charge Protection Voltage:3.65V  Continuous Discharge:10C (100A)  Pulse Discharge Rate:15C (5sec.)  Charging Current:6-50A  Weight:16oz.  Life:1500 cycles w/ 80%

3.65V 1.7hrs 5A Rate CHARGING DISCHARGING OVERCHARGE 10A Rate 0.8hrs 3.70V 5A Rate 3.30V 2.75V 1.7hrs 2.57V 3.30V 0.9hrs

 Charging 10Ah battery 5A (1/2C) took 1.7hrs to reach maximum charge protection voltage  Initial battery voltage was 3.35V (58% charged)  Charging 10Ah battery 10A (1C) took 0.8hrs to reach maximum charge protection voltage  Initial battery voltage was 3.30V (54% charged)  Discharging 10Ah battery 5A (1/2C) took 1.7hrs to reach 2.75V  Initial battery voltage was 3.30V (54% charged)  Test did not run battery to maximum discharge protection voltage  Discharging 10Ah battery 10A (1C) took 0.9hrs to reach maximum discharge protection voltage  Initial battery voltage was 3.3V (54% charged)

VOLTSAMPS LiFePO 4 Battery LeCroy Oscilloscope HV Probe Adapter High Voltage Probes Adjustable Discharge Load Box Battery Cell: S-69  Verify internal resistance of battery cell  Adjust discharge load across 15A range and observe battery voltage  Disconnect and reconnect 15A load, observing changes

0.5A 10.0A 15.0A 15.0A 0A 15.0A 500mV/div 500s/div = 8.33min/div  Measured Battery Cell Internal Resistance = 0.02V/A = 20mΩ  Spec. sheet read 8mΩ

 Charge 1C w/ initial 20% (2.56V) until a final 100% (3.65V)  Verify 10Ah charge capacity  Generate characteristic charge curve  Discharge 1C w/ initial 100% (3.65V) until a final 20% (2.56V)  Verify 10Ah discharge capacity  Generate characteristic discharge curve  Disconnect and reconnect a load current ranging from 5-20A on cell w/ 20% (2.56V)  Verify SC algorithm voltage thresholds  Connect several cells in series and repeat charge and discharge tests monitoring each cell’s voltage  Generate characteristic charge and discharge curve for individual cells in battery stack  Determine the priority for per cell battery management (cell balancing)