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These are barriers between various parts of the car, they may have minimal holes for ventilation or to allow controls to pass through but are otherwise solid and usually help the integrity of a vehicles structure by increasing rigidity.
The Greenpower regulations specify bulkheads in a few key areas:
“T2.7. The main batteries must be separated from the driver by a bulkhead, sufficient to restrain the batteries from the driving compartment. This bulkhead must not be able to short circuit the battery terminals.”
This requires a far stronger bulkhead than in section 1. A minimum 4mm good quality plywood or 1.5mm aluminium or composites. In some vehicles the battery compartment intrudes into the cockpit, this is acceptable as long as it is sufficiently strong to restrain the batteries and is fully sealed from the cockpit. Metal or carbon fibre must be covered with a suitable insulating material to prevent shorting the battery terminals.
T7.9. There must be a solid, rigidly mounted, bulkhead forward of the driver’s feet, with 200 mm depth of foam with a compressive strength of 300 – 700 Kn/m² affixed to the front side of this bulkhead, to protect the driver from frontal impact. Any material forward of the bulkhead must be easily deformable.
Note, this does not necessarily have to be the bulkhead immediately ahead of the driver's feet, some cars have a battery and/or steering compartment in this location and then the main impact bulkhead; this is perfectly acceptable.
Materials should be a minimum of 8mm good quality plywood, 3mm aluminium or composites, or 1.5mm steel. It is very important to fully integrated the front bulkhead into the rest of the vehicle's structure by fixing securely on all sides.
Gary Coulden Smith