Solar Jackets Racer Battery Monitoring System(BMS)Ali BibongeDaniel ChristopherPaul MartinMark SladeTaverishima TseghaOctober 26th, 2011

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BMS Project OverviewBattery monitoring system for a solar powered race carMaintain batteries in a safe to operate and efficient stateFor Solar Jackets entry into the American/World Solar ChallengeCost: $1200

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What Does the BMS Do?It Monitors:Li-ion Cell Over/Under VoltagesLi-ion Cell Over CurrentBattery Pack Over TemperatureTransmits/Receives acquired data via RS-485 to racer systems

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BMS Current Design StatusPrototype able to:Measure module currentMeasure module temperatureElectrically isolate the Li-ion cells

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Data Collected by the BMSData structure including:Voltage data (individual cells/module)Module temperatureModule current

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BMS System Flow Chart

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System Development ProblemsConversion of existing PIC18 code to PIC24Cost of electro-mechanical relay$130.00 per relaySpace limitations in the battery module

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Battery Box Limitations

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Another View

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Battery Module and Cell Thresholds

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Temperature Green Zone Test Picture

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Temperature Red Zone Test Picture

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Project MilestonesNovember 4: Working voltage sensing feature with PIC24November 9: Testing electromechanical relayNovember 16: Fabrication and assemblyDecember 9: Final presentation

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Questions?