Embodiments of the present disclosure provide a bottom tray plate for a battery, a battery tray, a battery pack, and a vehicle. The bottom tray plate includes a main body portion and a turnup portion. The main body portion includes a bottom wall and a side wall. The side wall is arranged around the bottom wall. The side wall and the bottom wall jointly define an accommodation cavity. The accommodation cavity is configured to accommodate a battery. A thickness of the bottom wall is t1, and 1 mm≤t1≤3 mm. The turnup portion is arranged at an edge of the side wall and arranged around the side wall. A thickness of the turnup portion is t2, and t2>t1.