TA Station Power Team Meeting, 11/10/2015. Autonomous Power System – In the field Why Lithium? -Significant weight and volume savings (41.9Wh/lb vs 21.25Wh/lb)

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Presentation transcript:

TA Station Power Team Meeting, 11/10/2015

Autonomous Power System – In the field Why Lithium? -Significant weight and volume savings (41.9Wh/lb vs 21.25Wh/lb) -Improved cold weather and self discharge performance -Improved lifespan -Increased cost and complexity

LiFePO 4 Battery 1 AGM (Lead acid) Battery 2 Solar Panel MCU Charge controller Load2 Autonomous Power System Block Diagram Energy Input MCU Load1

Voltage Temperature Balance control Cell 1 Voltage Temperature Balance control Cell 2 Voltage Temperature Balance control Cell 3 Voltage Temperature Balance control Cell 4 Battery Management System LiFePO 4 Battery Battery Terminals Lithium Battery Block Diagram Four 3.4V, 180Ah cells in each battery Voltage and temperature sensing on each cell Active cell balancing to prevent capacity mismatch Sub millisecond control of output terminals Short circuit, under/over voltage, under/over temperature protections Issues: 1.CC MCUs susceptible to damage during programming 2.Switch that controls battery output has failed in many batteries deployed in the field