Battery box and battery pack

The invention provides a battery box and a battery pack, the battery box comprises a box body, a first protective cover plate, a second protective cover plate, a first cooling plate, an explosion-proof valve, a fire extinguishing assembly, a particle separation assembly and a flame-retardant assembly, a mounting cavity is arranged in the box body, a water inlet channel and a water outlet channel are arranged on the box body, a plurality of cross beams are arranged in the mounting cavity, and air channels are arranged on the cross beams. The first protective cover plate and the second protective cover plate cover the opposite opening sides of the box body in a sealed mode, the second protective cover plate is connected with the cross beam in a sealed mode, a water cavity communicated with the water inlet channel and the water outlet channel is formed in the first cooling plate, and the first cooling plate is fixedly connected to at least part of the cross beam in a sealed mode. The first cooling plate is arran