This is the coolant plate we use in our own conversions at Current. We designed it in house for VDA format battery modules.
Machined aluminum, friction stir welded. Two -6AN ports on the top edge for coolant in and out.
Modules mount to both faces of the plate, one per side, so one plate cools two modules. The edges are drilled for M8 mounting and 1/4" dowel pins. Stand a few plates side by side, pin them together with dowels, and the plates stiffen up the whole pack. The Single, Double Long and Double Square plates all use the same edge pattern, so you can mix them to fit the box you're working with.
Put a thermal pad between each module and the plate. One pad per module, sold separately.
