A key part of the EcoCAR 2 learning experience is designing the main
traction battery. With competition level sponsor A123 Systems Inc .
having provided each team with a battery system, the University of
Waterloo Alternative Fuels Team (UWAFT) needed to prove their battery
design is safe and robust. One of the key elements of the battery design
is the thermal performance. UWAFT quickly realized that good thermal
performance will be critical to achieving every joule and kW from the
main traction battery. A cooler battery allows for more power and a
longer lifetime.
UWAFT turned to Dana-Long Manufacturing to provide cold-plates that
would extract heat from the modules. The cold-plates feed water through
them, providing a cooling surface for the batteries. These plates are
custom made for UWAFT and the A123 module geometry. Before the plates
could be used, the team needed to analyze if the plates could perform
under the most extreme conditions – a hot summer day in Yuma, Arizona –
where the team expects to be in either year two or three of EcoCAR 2
finals.
Competition level sponsor CD-Adapco Star-CCM+ was deployed to analyze
the performance of the cold-plates. Star-CCM+ is a computational fluid
dynamics (CFD) package that can simulate fluid flow and heat transfer.
By using Start-CCM+, UWAFT avoided using an expensive and complex
thermal test bench. Parameters such as flow rate could also be changed
quickly and the results compared easily. CD-Adapco staff also provided
invaluable training and advice at the Winter Workshop that helped the
team set-up the cold-plate simulation. The team is confident in its
design and is ready to test it out in the heat of Yuma!
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