Abstract: A battery box assembly includes a thermal management component; a frame fixed to an edge region of the thermal management component; a top cover covering the frame and forming, together with the frame and the thermal management component, a box for accommodating a battery module; a bottom protective plate fixed to the thermal management component in a direction leaving from the battery module and spaced from the thermal management component to form a sealed space; and an airflow pipeline arranged inside the box, where the airflow pipeline communicates with the sealed space on one end and communicates with the outside of the box on the other end. Also provided are a battery and a manufacturing method of the battery box assembly.

Abstract: The present application discloses a battery cell holder, a battery module, a battery, and an electrical apparatus. The battery cell holder includes: a holder body and an insulating member. The holder body is provided with at least one first channel in a first direction, and the insulating member is arranged on an outer surface of the holder body. The insulating member covers part or all of the outer surface, and the surface of the insulating member facing away from the holder body is capable of fixing a battery cell. By providing the holder body with the first channel, and fixing the battery cell to the holder body on the peripheral side of the first channel, after the battery cell radiates heat, the heat flows out through the first channel, so that the temperatures of the battery cell itself and the environment surrounding the battery cell can be reduced, thereby alleviating the battery safety problem caused by the accumulation of heat during the use of the battery.

Abstract: The disclosure provides a method for preventing marine biofouling by using the principle of harmonic vibration. The method includes coating a surface of a device to be disposed in water with an elastic material layer. The elastic material may vibrate harmonically under the influence of the water traveling wave, thereby forming a cosine wave form. Taking “a” as the wavelength of the harmonic vibration, “b” as the amplitude of the harmonic vibration and “L” as the body length of a mussel larva, an algae larva or a barnacle larva, where L/2 is larger than “a” or “b”, the larva will be easily stripped off under the effect of harmonic vibration. The frequency of the cosine wave ranges from 0.02 Hz to 0.1 Hz so that the larva has insufficient time to stay, thereby preventing the larva from attaching.