Note for
...
People Just Starting
For a beginner’s/new member’s introduction to what kind of specifications are given for cells, read this: Battery Specification Guide (WIP). Additionally, take a look at the datasheet for the cell we used for MS15, LG’s INR21700 M50 cell: M50 Datasheet. Looking at what kind of specifications are given will give you an idea of what criteria can be used to choose a “good” cell for our pack.
Pack Constraints & Requirements
Constraints relating to the pack is important to keep in mind when doing cell selection, think about what configuration we will get based on the cell choice and what kind of implications that might have.
Constraint/Requirements | Reasoning + Notes |
|---|---|
Max Energy Capacity <= [FILL IN AFTER REG DROP] | |
Max Voltage < 165V | Constraint based on motor controller’s max cont. bus voltage [1] |
Minimize Weight | The battery is a big contributor to the car’s weight. The lighter it is, the more efficient our car will run. Additionally, a lighter pack is easier to remove, making serviceability and overall quality of life better. We won’t be putting an exact target number for the battery’s weight because there are certain trade-offs that can be made between the weight and other requirements (like decreasing heat generated). |
Minimize Volume | The battery takes up a considerable amount of space. As we aim for a slimmer car with MS16 minimizing volume is a requirement. |
Cell Selection Criteria
In an effort to make MS16’s battery pack more efficient and reliable, the following criteria were deemed to be the most important when selecting for the MS16 cell.
Criteria Specification (Unit) | Why it’s Important | Importance Ranking (1 is highest) |
|---|---|---|
Capacity (Ah) | MS16’s battery pack will | |
Resources
[1] https://docs.prohelion.com/Motor_Controllers/WaveSculptor22/Datasheet/DC_Bus.html