Abstract: A cover plate assembly includes a cover plate and a sealing member. The cover plate is provided with a first through hole, and the sealing member is disposed to pass through the first through hole. In a direction perpendicular to the cover plate, the sealing member has a first end face and a second end face opposite to each other. The sealing member is provided with a first groove extending from the second end face to the first end face. An outer sidewall of the sealing member close to the second end face is provided with a first protrusion extending in a direction parallel to the cover plate and protruding from a surface of the cover plate. A distance between an edge of the first protrusion and an axis of the first through hole is greater than a radius of the first through hole.

Abstract: Disclosed are a cover assembly, a battery and a battery pack. The cover assembly includes a cover body and an insulating member. The insulating member includes a connecting portion and a guide portion. The connecting portion is mounted to the cover body, the guide portion is provided in an annular shape and connected to a side of the connecting portion away from the cover body in a first direction. The guide portion is provided with a cavity and comprises a guide surface away from the cavity. The guide surface is an inclined surface. An orthographic projection of the guide surface in the first direction falls entirely within the connecting portion.

Abstract: The present invention relates to a method for detecting fire with light section image to sense smoke. Infrared radiation arrays (1) and infrared cameras (2) are provided in a monitored area. The images of the infrared light spots transmitted by the infrared radiation arrays (1) are converted into video signals by the infrared cameras (2), and transferred to a video switcher (3). The video switcher sends the video signals received from the infrared cameras to a computer (4) one by one. The computer processes the signals. If fire is sensed, the computer controls the alarm unit (5) to alarm by a linkage.