*From Nicole’s I-pad, Shem Kim Vaibhav Bommalapalayam please add anything I missed
[Session 1]
Cell Selection
Things to think about:
...
Brick batteries (WashU used these)
more data - test different cells and see if they are better than LG Cells
less time testing
better spot-welding method
more cell holders/charging, run tests in-parallel (speed, reducing time-spent)
good scheduling, documentation
[Session 2]
Cell Chemistry
Weight limit-different energy densities
Li-Polymer
Pressure or else it will expand
Press it down so it has more contact
will EXPAND
constraints: too-expensive
LiFEPO4
lower energy-density, heavier
SMP Count:
Use Excel sheet to test different configurations
Refer to motor-controller sheet for required
Make sure continuous busbar maximum value for modules does not exceed maximum power
cells in parallel add more consistent power than in series
Brunel Solar Car Team
punch-cells
anode material
sillicon instead of graphite
6-14 amps - motor is more efficient
Use the weight of the car to calculate the speed of the car
Then calculate the number of amps needed for cruising speed
Get the coefficient of drag + friction
Refer to the golden book (I’m assuming he means the “winning solar car” book in the bay)
Use the mass of current car
Notes/Main Takeaways for MS16
Figure out power to supply constant cruising speed
current supplied on peak of efficiency motor
used to determine voltage
maximize voltage so less I^2R losses
current stays in peak even if series voltage sags
cell chemistry - do research that time
2 months - battery bro - $3368 - consider comparison to data-sheet
Refer to motor graph called motor-efficiency curve
ask school for more money for cells
determine pack S& P count before modules