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How necessary is battery cooling for a recreational Ev? I wont be running in cold temperatures as it will be a convertible but if I plan on "driving the car in anger" like the ocasioaal track lap or autoX day. Is cooling beyond making sure the packs have good airflow important? I am thinking about 3d printing packs for individual cells so I can optimize my kwh/volume
 

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How long is a piece of string?

Too many variables to give a general answer.

Make sure your temp sensors are well distributed and embedded, realizing that detection of cell-internal temp rises will be delayed and understated

and just stop or at least slow down based on hitting say 35°C

Other choices are much bigger packs to lower C-rates

keep to low performance levels

or put cooling in whether you predict it is needed or not
 
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