Abstract: A negative electrode plate includes a negative electrode current collector and a negative electrode film layer formed on at least one surface of the negative electrode current collector. The negative electrode film layer has a first surface distant from the negative electrode current collector and a second surface arranged opposite to the first surface. The thickness of the negative electrode film layer is denoted as H. A region within a thickness range from the first surface to 0.3 H of the negative electrode film layer is denoted as a first region of the negative electrode film layer. A region within a thickness range from the second surface to 0.3 H of the negative electrode film layer is denoted as a second region of the negative electrode film layer. The binder content in the first region is less than the binder content in the second region.

Abstract: Provided are a graphite negative electrode active material and a preparation method therefor, a secondary battery containing the same, and a power consuming apparatus. A powder compaction density of the graphite negative electrode active material under a pressure of 49000 N is greater than or equal to 1.60 g/cm3, and a ratio Id/Ig of a peak intensity Id at 1250 cm?1 to 1500 cm?1 and a peak intensity Ig at 1500 cm?1 to 1650 cm?1 in a Raman spectrum of the graphite negative electrode active material is greater than or equal to 0.15.

Abstract: Provided are a graphite material and a preparation method therefor, a negative electrode plate containing the same, a battery, and a power consuming apparatus. The graphite material satisfies (Lc100% SOC?Lc0% SOC)/Lc50% SOC?0.0750 and Lc0% SOC being less than or equal to 50 nm.

Abstract: A secondary battery includes a negative electrode sheet. The negative electrode sheet includes a negative electrode current collector and a negative electrode film layer, which is arranged on at least one surface of the current collector and includes a negative electrode active material and a conductive agent. The powder conductivity ? of the negative electrode active material is greater than or equal to 80 S/cm but less than or equal to 106 S/cm, and the compaction density of the negative electrode film layer is 1.35 g/cm3 to 1.50 g/cm3.

Abstract: A carbon-based negative electrode active material, a preparation method, a secondary battery, and a power consuming apparatus are provided. A gram volume of the carbon-based negative electrode active material is 345 mAh/g to 355 mAh/g, and the powder compaction density at a pressure of 20000 N is greater than 1.55 g/cm3 and less than 1.65 g/cm3.

Abstract: A graphite negative electrode active material and a preparation method therefor, a secondary battery containing the same, and a power consuming apparatus. A volume distribution particle size Dv1 of the graphite negative electrode active material ranges from 1.5 ?m to 3 ?m, and the graphite negative electrode active material includes a primary particle morphology.

Abstract: A graphite negative electrode active material and a preparation method therefor, a secondary battery, and an electrical device. A degree of graphitization of the graphite negative electrode active material is 88%-93%, and an oil absorption value of the graphite negative electrode active material is not more than 50 ml/100 g.

Abstract: A particle body of the graphite negative electrode active material includes an internal region and a surface-layer region at least partially surrounding the internal region. The surface-layer region refers to a region formed by extending from a surface of the particle body of the graphite negative electrode active material to an interior of a particle by a distance of 30 nm. The mass percentage of crystalline carbon in the internal region is denoted as ?1, the mass percentage of crystalline carbon in the surface-layer region is denoted as ?2, and 10%??1??2?35%.

Abstract: A secondary battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer formed on at least one surface of the negative electrode current collector. The negative electrode film layer has a first surface away from the negative electrode current collector and a second surface arranged opposite to the first surface. A thickness of the negative electrode film layer is denoted as H. A region within a thickness range from the second surface of the negative electrode film layer to 0.3H is denoted as a first region of the negative electrode film layer. A region within a thickness range from the first surface of the negative electrode film layer to 0.3H is denoted as a second region of the negative electrode film layer. The first region includes a first binder. The first binder is a linear binder.

Abstract: A secondary battery includes a negative electrode sheet, where the negative electrode sheet includes a negative electrode current collector and a negative electrode film layer arranged on at least one surface of the negative electrode current collector, the negative electrode film layer includes a negative electrode active material, a compaction density of the negative electrode film layer is greater than or equal to 1.45 g/cm3, a liquid absorption rate of the negative electrode active material is 30 ml/100 g to 60 ml/100 g, and a tortuosity of the negative electrode sheet is less than or equal to 6.

Abstract: The present disclosure provides a secondary battery and an electric apparatus. The secondary battery comprises a negative electrode sheet including a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector. The negative electrode film layer includes a first region adjacent to the negative electrode current collector and a second region adjacent to a surface away from the negative electrode current collector. ID/IG of an active material in the second region is greater than ID/IG of an active material in the first region. ID/IG is a ratio of a D peak intensity to a G peak intensity obtained by Raman mapping, where ID represents a D peak intensity at 1350±100 cm1 and IG represents a G peak intensity at 1580±100 cm?1.

Abstract: A secondary battery includes a negative electrode sheet, where the negative electrode sheet includes a negative electrode current collector and a negative electrode film layer disposed on at least one surface of the negative electrode current collector, the negative electrode film layer includes a negative electrode active material and a conductive agent, the negative electrode active material includes a graphite material, and the tap density of the graphite material is greater than or equal to 1.2 g/cm3; and based on the total mass of the negative electrode film layer, the mass percentage of the conductive agent is greater than or equal to 1.6%.

Abstract: A secondary battery includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector and a negative electrode film layer formed on at least one surface of the negative electrode current collector. The negative electrode film layer includes a graphite material. The graphite material has a tap density of 1.2 g/cm3 to 1.4 g/cm3. In addition, a difference between a compaction density of the negative electrode film layer and the tap density of the graphite material is not less than 0.15 g/cm3.

Abstract: A graphite negative electrode active material and a preparation method therefor, a negative electrode plate, a secondary battery, and an electrical apparatus. A particle body of the graphite negative electrode active material comprises an interior area and a surface layer area at least partially surrounding the interior area, the surface layer area referring to an area formed extending a distance of 30 nm from the surface of the particle body of the graphite negative electrode active material toward the interior, and the surface layer area comprising a disordered layer. The graphite negative electrode active material can balance the kinetic performance and the cycling stability of a battery.

Abstract: A metro rail corrugation measurement method based the Seq2Seq model and vibration and noise data fusion comprises the following steps: Constructing a time series data set corresponding to floor longitudinal acceleration and train speed based on historical data of metro trains; Constructing the metro train mileage matching prediction model based on the Seq2Seq model, training the metro train mileage matching prediction model by time series data sets, and inputting the inside floor longitudinal acceleration of the metro train to be detected into the trained metro train mileage matching prediction model to obtain the running speed of the metro train to be detected. According to the vibration and noise data of the metro train to be detected, the vibration and noise composite index of the rail corrugation is calculated to determine the wavelength and amplitude information corresponding to the rail corrugation.

Abstract: This application discloses a secondary battery including a positive electrode plate and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode film disposed on a surface of the positive electrode current collector and comprising a positive active material, the negative electrode plate comprises a negative electrode current collector and a negative electrode film disposed on a surface of the negative electrode current collector and comprising a negative active material. The positive active material comprises one or more of layered lithium transition metal oxides and modified compounds thereof, and a resistance R of the negative electrode plate satisfies: 6.0 m??R?12.0 m?; or the positive active material comprises one or more of lithium-containing phosphates with olivine structure and modified compounds thereof, and a resistance R of the negative electrode plate satisfies: 3.0 m??R?7.0 m?.

Abstract: The method includes: S1: formulating a layered game architecture for a port-and-ship integrated energy and transportation operation; S2: establishing a port-and-ship layered game optimization model based on an optimized objective function and an optimized constraint condition of a port and an optimized objective function and an optimized constraint condition of a ship; and S3: based on the port-and-ship layered game optimization model, solving, by the layered game architecture, an optimal integrated operation method for the port-and-ship energy and transportation system through a KKT (Karush-Kuhn-Tucker) optimality condition solving method. The port-and-ship layered game optimization model means that the port, as a superior guider, formulates and executes a strategy, the ship, as an inferior follower, makes corresponding responses by taking the strategy formulated by the port as a constraint, and the ship updates its strategy according to the responses made by the ship till reaching a game equilibrium.

Abstract: This application discloses a secondary battery including a positive electrode plate and a negative electrode plate, wherein the positive electrode plate comprises a positive electrode current collector and a positive electrode film disposed on a surface of the positive electrode current collector and comprising a positive active material, the negative electrode plate comprises a negative electrode current collector and a negative electrode film disposed on a surface of the negative electrode current collector and comprising a negative active material. The positive active material comprises one or more of layered lithium transition metal oxides and modified compounds thereof, and a resistance R of the negative electrode plate satisfies: 6.0 m??R?12.0 m?; or the positive active material comprises one or more of lithium-containing phosphates with olivine structure and modified compounds thereof, and a resistance R of the negative electrode plate satisfies: 3.0 m??R?7.0 m?.

Abstract: The present application discloses a secondary battery, an apparatus including the secondary battery, artificial graphite and a method for the preparation thereof. The secondary battery includes a negative electrode plate including a negative active material, wherein the negative active material includes an artificial graphite having a numerical particle size Dn10 of at least 1 ?m; the artificial graphite has a graphitization degree of 90% to 95%; and the negative electrode plate has an OI value of at most 15, wherein the OI value of the negative electrode plate represents a ratio C004/C110, in which C004 is the peak area of the diffraction peak of 004 crystal plane of the artificial graphite in the negative electrode plate and C110 is the peak area of the diffraction peak of 110 crystal plane of the artificial graphite in the negative electrode plate.

Abstract: A metro rail corrugation measurement method based the Seq2Seq model and vibration and noise data fusion comprises the following steps: Constructing a time series data set corresponding to floor longitudinal acceleration and train speed based on historical data of metro trains; Constructing the metro train mileage matching prediction model based on the Seq2Seq model, training the metro train mileage matching prediction model by time series data sets, and inputting the inside floor longitudinal acceleration of the metro train to be detected into the trained metro train mileage matching prediction model to obtain the running speed of the metro train to be detected. According to the vibration and noise data of the metro train to be detected, the vibration and noise composite index of the rail corrugation is calculated to determine the wavelength and amplitude information corresponding to the rail corrugation.