Abstract: This application provides a negative electrode material, a negative electrode plate, a secondary battery, and an electric apparatus. A button battery containing such negative electrode material has a charge gram capacity of Cap.C mAh/g and a discharge gram capacity of Cap.D mAh/g, 13?Cap.C-Cap.D?18, where 335.0?Cap.C?355.0 and 320.0?Cap.D?340.0. The secondary battery using such negative electrode material has excellent cycling performance.

Abstract: A negative electrode material includes a carbonaceous active material. Observed in a 80 ?m×100 ?m region of an SEM image, the carbonaceous active material includes carbonaceous particles with pores. A proportion of a quantity of the carbonaceous particles with a quantity of the pores of N?2 in a total quantity of the carbonaceous particles in the 80 ?m×100 ?m region is ?60%, and a proportion of a quantity of the carbonaceous particles with a quantity of the pores of 3?N?5 in the total quantity of carbonaceous particles in the 80 ?m×100 ?m region is ?30%.

Abstract: An electrochemical apparatus includes an electrolyte and a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector. The negative electrode active material layer contains a negative electrode active material, and a tortuosity T of the negative electrode active material layer satisfies the following relation: 1 < T ? 2.5, where the tortuosity T is a ratio of a transmission path length Lt of the electrolyte in pores of the negative electrode active material layer to a thickness L0 of the negative electrode active material layer.

Abstract: A negative electrode active material includes a carbon material, where the carbon material has a specific degree of graphitization and aspect ratio distribution. A degree of graphitization Gr of the carbon material measured by an X-ray diffraction analysis method is 0.82 to 0.92, and based on a total quantity of particles of the carbon material, a proportion of particles with an aspect ratio greater than 3.3 in the carbon material is less than 10%. The negative electrode active material helps to improve cycle performance of the electrochemical apparatus. FIG. 1.

Abstract: A meter circuit apparatus and a method for implementing metering are disclosed, wherein the apparatus includes: an electric energy meter (1), a combining unit (2) and a current transformer (3), wherein the current transformer (3) is connected to the combining unit (2) and the electric energy meter (1) and is configured to acquire an electrical quantity of a intelligent substation, and input the electrical quantity to the combining unit (2) and the electric energy meter (1); the combining unit (2) configured to combine and synchronize the electrical quantity inputted by the current transformer (3), and forward a processed digital signal in a specific format; and the electric energy meter (1) is configured to charge for the electrical quantity inputted by the current transformer (3). Requirements of regular metering and intelligent measurement are satisfied within adding an independent current transformer (3).