Abstract: A battery module includes: a plurality of cells; and a cell restraining structure having an internal frame and an external shell fit with the internal frame to form a plurality of chambers for receiving the plurality of cells respectively so as to package and manage the cells. The internal frame includes an elastic element forming at least one first surface of each chamber, the elastic element being elastically deformed as being pressed by a predetermined amount by a corresponding cell received in each chamber such that the elastically deformed elastic element exerts a first force to the corresponding cell. The elastically deformed elastic element is further pressed or tends to recover in responding to reversible expansion or contraction of the corresponding cell in operation such that a restraining force to the corresponding cell is determined by the first force.

Abstract: Disclosed are a central chirality induced spiro chiral tetradentate cyclometalated platinum (II) and palladium (II) complex-based circularly polarized luminescence material and an application thereof. Spiro chiral metal complex molecules can be autonomously induced by a whole tetradentate ligand to coordinate with metal ions in a less sterically hindered manner by means of a central chiral fragment La in the tetradentate ligand, to form an optically pure spiro chiral metal complex-based circularly polarized luminescence material, without need for chiral resolution. Moreover, the material has high chemical stability and thermal stability, and has important applications in circularly polarized luminescence devices.

Abstract: A method for preparing a sintered metal matrix diamond saw blade used for cutting a QFN packaging device includes steps of: preparing metal matrix by employing metal powder and inorganic filler, wet-mixing and stirring the metal matrix, adding diamond grains to form a mixed material with evenly distributed diamond grains, performing the mixed material through cold pressing for pre-shaping, preparing a sintered metal matrix diamond saw blade blank through hot-pressing sintering, and finally machine-shaping the sintered metal matrix diamond saw blade blank to meet the dimensional requirements. The firm interface metallurgical bond is formed between the metal matrix and the diamond grains by the hot-pressing sintering process, which enhances holding force of the metal matrix on the diamond grains, in such a manner that abrasive grains are not easy to fall off untimely during cutting, thus prolonging service life of the sintered metal matrix diamond saw blade.

Abstract: A method for preparing a sintered metal matrix diamond saw blade used for cutting a QFN packaging device includes steps of: preparing metal matrix by employing metal powder and inorganic filler, wet-mixing and stirring the metal matrix, adding diamond grains to form a mixed material with evenly distributed diamond grains, performing the mixed material through cold pressing for pre-shaping, preparing a sintered metal matrix diamond saw blade blank through hot-pressing sintering, and finally machine-shaping the sintered metal matrix diamond saw blade blank to meet the dimensional requirements. The firm interface metallurgical bond is formed between the metal matrix and the diamond grains by the hot-pressing sintering process, which enhances holding force of the metal matrix on the diamond grains, in such a manner that abrasive grains are not easy to fall off untimely during cutting, thus prolonging service life of the sintered metal matrix diamond saw blade.