Abstract: An electrical connector includes a signal joint and a circuit board seat. The circuit board seat includes a seat body, a clamp component and a mount component. The seat body includes a base portion, a mount portion and a clamp portion. The base portion is fixed to the signal joint, the mount portion and the clamp portion are respectively connected to two opposite sides of the base portion, and the base portion, the mount portion and the clamp portion together form an accommodation recess. The clamp component is movably located in the accommodation recess. The clamp component and the clamp portion together form an installation space, and the installation space is configured to accommodate a circuit board. The mount component is movably disposed through the mount portion of the seat body of the circuit board seat, and the mount component is connected to the clamp component.

Abstract: The disclosure provides a freezing device for freezing a liquid mixture and a method using the same. The freezing device includes a container and a tray removably disposed in the container. The tray has a tray plate disposed above a container bottom wall and has a plurality of spaced-apart receptacles for receiving the liquid mixture. When liquid nitrogen is introduced into a region between the tray plate and a container bottom wall, the liquid mixture received in the receptacles is solidified by the liquid nitrogen and is formed into shaped solid coolant pieces.