Patent No. EP3981630 (titled "A Wheelbase Structure") was filed by Volvo Truck on Oct 6, 2020. The application was issued on Jul 12, 2023.
A wheelbase structure for a vehicle main supporting structure that houses energy storage or transformation devices, such as batteries, fuel tanks, or fuel cells. The structure comprises a sandwich panel with a metal outer layer and a foam or insulation core, forming a floor and side walls of the vehicle. The sandwich panel extends along the majority of the wheelbase length, providing a rigid and lightweight housing for the energy storage devices. The structure also includes an internal channel for cabling and heat transfer piping, and a pre-loaded module with cabling, piping, and connection interfaces for easy assembly.

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