DEPLOYABLE VEHICLE BRACE

An assembly including a vehicle battery tray. The assembly includes a track fixed relative to the vehicle battery tray. The track is elongated along a cross-vehicle axis. The assembly includes a brace slideably engaged with the track. The brace is slidable along the track relative to the vehicle battery tray along the cross-vehicle axis in a vehicle-outboard direction from an undeployed position to a deployed position. The assembly includes a pyrotechnic actuator operatively coupled to the brace to slide the brace along the track from the undeployed position to the deployed position.