Abstract: Provided are a positive electrode active material, a positive electrode plate, a battery cell, a battery and an electrical apparatus, which belongs to the technical field of secondary batteries. The positive electrode active material includes a lithium-rich manganese-based material and a lithium-containing phosphate, in which, the lithium-rich manganese-based material includes solid particles and hollow particles, the hollow particle including a shell and a cavity provided inside the shell. Both the rate performance and the volume energy density of the battery cell can be taken into consideration in the technical solution.

Abstract: Provided in the present application are a positive electrode active material and a preparation method therefor, and a positive electrode sheet, a battery and an electric device. The positive electrode active material of the present application comprises (1?a)LiNixM1yM2(1-x-y-z)NbzO2·aLi2MnO3, wherein M1 comprises one or two elements of Mn and Al; and M2 comprises one or more transition metal elements except Mn, Ni and Nb. The positive electrode active material of the present application can improve the cycling stability of a battery and the capacity of the battery after cycling.

Abstract: A battery module, including a positive electrode current collector, a negative electrode current collector, and a plurality of solid-state battery cells are disclosed. The plurality of solid-state battery cells are stacked between the positive electrode current collector and the negative electrode current collector. Adjacent ones of the solid-state battery cells are electrically connected through a current collector coating layer. The solid-state battery cells at both ends are electrically connected to the positive electrode current collector and the negative electrode current collector respectively. A method for preparing the battery module, a battery pack and an electrical apparatus are disclosed. The battery module has low production cost and a simple production process.

Abstract: An ultra-low-speed rotating low-strain high-filling-rate hydrogen alloy automatic absorption-desorption reaction device includes a shell, a hydrogen storage reaction bed, a motor, a controlling and monitoring system, a wire inlet port, a hydrogen absorption and desorption port, and a universal angle wheel. The reaction bed is circular, rotating at a low speed under driving of a light ultra-low speed motor; facades on two sides of the reaction bed are respectively provided with a transmission shaft and the hydrogen absorption and discharge port which are respectively connected with an ultra-low-speed gear reduction motor or a high-pressure hydrogen storage tank and a hydrogen-consuming device; the reaction bed includes a hydrogen storage metal alloy, a heat-conducting anti-hardening filling material, and a phase change material; a shell of the alloy reaction bed has a heater and an external side surface of a hydrogen storage alloy reaction device has a PLC controlling and monitoring system.

Abstract: A surface condensation process and device for efficiently removing coal combustion fly ash micro spheres are provided. The device is comprised of a patterned-plate type atomizer, a flow meter, an ultrasonic drive power source, an automatic temperature controller, a heat-tracing pipeline, a condensation sleeve, an electrically heated water storage tank, a water pump and an electrostatic precipitator.

Abstract: Embodiments of the present invention disclose an inversion-type package structure for a flip chip and a flip chip having the same, which relate to the technical field of chip packaging, and solve the defect that the existing manners for measuring chip temperature cannot accurately measure the temperature when a die of the flip chip works. The inversion-type package structure for the chip as provided by the present invention comprises a package substrate, a die welded on the package substrate in an inversion manner, a package housing and at least one temperature measuring element, which is characterized in that the at least one temperature measuring element is arranged in a first space below the die in the package substrate, and a residual space except for the space occupied by the at least one temperature measuring element in the first space is filled with an insulating heat conductive substance.

Abstract: A surface condensation process and device for efficiently removing coal combustion fly ash micro spheres are provided. The device is comprised of a patterned-plate type atomizer, a flow meter, an ultrasonic drive power source, an automatic temperature controller, a heat-tracing pipeline, a condensation sleeve, an electrically heated water storage tank, a water pump and an electrostatic precipitator.