I’m going to build an internal e‑foil battery box from 6 mm marine plywood with fiberglass and epoxy on the outside. The only problem I see is that plywood has poor thermal conductivity, which may cause the battery to overheat. What do you think?
When you say “internal” - does that mean inside the board with a hatch or just a protective casing for the cells?
Why do you assume your battery will generate a lot
of heat that needs to be dissipated?
Inside a board with hatch.
12s10p 21700 middle-current elements. 50A max battery current expected, about 30A continuous.
So if I understand correctly you are just using the plywood as part of the board layup to form the cavity where the battery will sit. I can’t see how that would affect thermal anymore than the way the production boards are made.
I run a 10S11P 21700 pack inside a Fliteboard compartment and have never had it get more than slightly warm so your concern about battery heat may not be something to be concerned with. 
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