Building an Open-Source Hardware Flow Battery Development Kit

Parts

• 1 24 V DC power source - Anything between 12 V and 24 V may work but the results achieved here use 24 V. Motor speeds may need calibration to match existing results
• 200 g of 3D printing feedstock
• 1 Arduino UNO R3 - or equivalent microcontroller that can output two independent 5V PWM signals and connect to PC over USB serial
• 4 barbed fittings
• 10 cm² of conductive felt
• 100 cm² of copper sheet
• 2 diaphragm pumps
• 160 cm² of gasket sheet - Dimensions must be at least enough to cut out approx. four 6 cm x 8 cm rectangles, an A4 sheet is enough
• 100 cm² of grafoil
• 1 L298N motor driver
• 4 M6 nuts
• 4 M6 x 60 mm hex socket cap bolts
• 4 o-rings
• A4 sheet separator sheet
• 1 meter of tubing

Tools

• 1 1/8" drill bit
• 1 10 mm socket - To fit torque wrench
• 1 3-axis mill
• 1 3D printer
• 1 5mm hex key
• 1 drill - A hand drill or rotary tool (with steady hands) works, but a drill press is preferable
• 1 pair of chemical safety goggles
• 1 pair of nitrile gloves
• 1 PC - Must be able to flash firmware to microcontroller and connect over USB serial to microcontroller and potentiostat
• 1 potentiostat
• 1 sheet of sandpaper
• 1 scale
• 1 stir bar
• 1 stir plate
• 1 torque wrench - to accept 5 mm allen key or 10 mm hex socket
• 2 vial
• 1 vinyl cutter machine - or laser cutter or hand tools
• 1 vise
• 1 weighing spatula

Chemicals

• 5 grams of deionized water
• 5 grams of potassium iodide
• 5 grams of zinc chloride