Abstract: Disclosed is a sound producing device and an electronic product, the sound producing device including a front cover and a shell which are bonded together; wherein a diaphragm is accommodated in a cavity enclosed by the front cover and shell, an upper surface of the front cover away from the diaphragm is covered with an elastic sealing piece, and the elastic sealing piece and the front cover are bonded by hot pressing.

Abstract: Described herein is an electric injection annealing test device for crystalline silicon photovoltaic solar cells, the test device comprises a dark box, a sample test bench, a temperature control device, a power supply device and an image acquisition device. The sample test bench, the temperature control device, the power supply device and the image acquisition device are located in the dark box; the sample test bench is used to place a solar cell sheet; the temperature control device is used to control a temperature of the solar cell sheet; the power supply device provides a current to the solar cell sheet, the image acquisition device is used to acquire electroluminescence images of the solar cell sheet under different temperatures and current conditions.

Abstract: The present invention discloses an electric injection annealing test device for crystalline silicon photovoltaic solar cells, the test device comprises a dark box, a sample test bench, a temperature control device, a power supply device and an image acquisition device. The sample test bench, the temperature control device, the power supply device and the image acquisition device are located in the dark box; the sample test bench is used to place a solar cell sheet; the temperature control device is used to control a temperature of the solar cell sheet; the power supply device provides a current to the solar cell sheet, the image acquisition device is used to acquire electroluminescence images of the solar cell sheet under different temperatures and current conditions. The device can provide stable temperature and current, and obtain electroluminescence images of solar cell sheet under different temperature and current conditions.