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And read “Inside 18650 Cells”: https://www.electricbike.com/inside-18650-cell/
Here is a Video explaining basic electrical calculations (Hint: these calculations will be used in the exercise):
https://www.youtube.com/watch?v=cX4s-bxn4fs
BRUH! This is so good damn.. bless whoever made this:
https://batteryuniversity.com/articles
Then read these for some more in-depth background for battery packs
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Step 2
We’ll start with a simple pack - here are some of the specs that we want for this project:
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Now that you should know how to design a battery pack, we’ll get you to run through the process of choosing a battery configuration for a car, given the following parameters (chosen to loosely represent Midnight Sun XIV):If you think there’s info missing here, message Micah Black on slack and I’ll first make sure I didn’t make a mistake in the info provided, and then help you out to make sure you’re on the right track!
Car Specs:
Item | Spec | Notes |
|---|---|---|
Race Distance | 3000km | |
Car Average Velocity | 60km/h | Assume average velocity for the entire duration of the race, and that the path is flat. |
Power Consumed travelling at Average Velocity | 1005W | Per Motor |
Peak Motor Power | 5000W | Max power that the motors will draw (per motor) |
Number of Motors | 2 | Motors on each of the 2 rear wheels |
Motor Controller Min, Max Voltage | 50V, 165V | |
Single Cell Min, Max Voltage | 2.5V, 4.2V | At the full charge and full discharge limits |
Nominal Cell Voltage | 3.635V | Average voltage of a cell over the full discharge curve |
Single Cell Capacity | 3450mAh | Assume all cells are perfectly balanced |
Max Discharge Current of Single Cell | 10A | |
Solar Power Input | 800W | Assume the sun is always shining for the entire duration of the race |
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The solar panels on the Midnight Sun Vehicles provide power directly into the High Voltage system, which powers the motors - it's another power source for the car and will lighten the load on the batteries.
Extra Resources
https://batteryuniversity.com/articles
And read “Inside 18650 Cells”: https://www.electricbike.com/inside-18650-cell/
Then read these for some more in-depth background for battery packs
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