Abstract: When target data is to be accessed, a computing node determines whether the target data meets a computing pushdown condition. When the target data meets the computing pushdown condition, send a data access request to a storage node. After receiving the data access request, the storage node obtains a dataset to which the target data belongs, performs the computing service based on the computing indication, accesses the target data in the dataset, and feeds back an access result to the computing node.

Abstract: The present disclosure provides a packaging device and a packaging method. The packaging device includes a conveying mechanism, a packaging mechanism and a guide mechanism. The conveying mechanism is configured to convey a battery in a first direction; the packaging mechanism comprises a driving assembly, two supports arranged at an interval and two pressing members arranged in parallel, and the supports are connected to the driving assembly; and the packaging mechanism is mounted on the guide mechanism.

Abstract: The present disclosure provides an electrode plate die-cutting method and an electrode plate die-cutting device. The electrode plate die-cutting method includes: conveying an electrode plate material strip in a first direction to a cutting area of an electrode plate die-cutting device; and adjusting, based on the electrode plate material strip, a position of each of a first laser cutting assembly and a second laser cutting assembly of the electrode plate die-cutting device to position a center point of a first laser galvanometer of the first laser cutting assembly above a predetermined electrode plate cutting line and to position a center point of a second laser galvanometer of the second laser cutting assembly above the tab cutting area.

Abstract: A laminated battery cell and a preparation device and method thereof are provided. The laminated battery cell is prepared by folding a battery cell structure. The battery cell structure includes one or more first electrode sheets, one or more separators and one or more second electrode sheets. The one or more first electrode sheets are located on and connected to a side of the one or more separators by a normal temperature and pressure conductive adhesive. A plurality of second electrode sheets are alternately arranged on and connected to a side of the one or more separators facing away from the one or more first electrode sheets by a normal temperature and pressure conductive adhesive. The normal temperature and pressure conductive adhesive has good adhesion and conductivity, improves the battery liquid absorption effect and interface conditions, and improves battery performance.

Abstract: A self-discharge screening method for lithium-ion batteries is provided. In the method, a single batch screening objects includes a plurality of trays. Each tray of the plurality of trays includes a plurality of batteries to be screened. Voltage drops per unit time of the plurality of batteries to be screened are measured. Voltage drop screening thresholds of the plurality of trays are determined according to the measured voltage drops per unit time. Unqualified batteries are screened out according to a relative relationship between the voltage drop screening threshold of the tray and the voltage drops per unit time of the plurality of batteries.

Abstract: A drying device is provided and is configured to dry an electrode sheet. The drying device includes: a box body, a plurality of first infrared drying assemblies, and a plurality of second infrared drying assemblies. The box body defines a drying channel extending through the box body. The electrode sheet is capable of being conveyed in the drying channel; the drying channel has a first side and a second side opposite to the first side; the box body includes a first drying section arranged along a conveying direction of the electrode sheet. The plurality of first infrared drying assemblies are arranged on an inner wall of the first drying section and located on the first side of the drying channel. The plurality of second infrared drying assemblies are arranged on the inner wall of the first drying section and located on the second side of the drying channel.

Abstract: This disclosure describes a database backup method and apparatus, and a computing device cluster. In embodiments, a first corrupted-page inspection operation is performed on a first page in a data table of a database, to determine a first inspection result, where the first is used to record metadata of the data table; the first page is backed up when the first inspection result indicates that the first page is a normal page; a second corrupted-page inspection operation is performed on a second page in the data table based on the first page, to determine a second inspection result, where the second is used to record data in the data table; and the second page is backed up when the second inspection result indicates that the second page is a corrupted page.

Abstract: A preparation method of a thermally composited laminated cell and a thermally composited laminated cell are provided. The preparation method includes: preparing a plurality of first electrode plate groups and a plurality of second electrode plate groups, each of the first electrode plate groups includes a plurality of first units, each of the second electrode plate groups includes a plurality of second units. An outermost side of the first unit is provided with a negative electrode plate, and an outermost side of the second unit is provided with a positive electrode plate. Providing a first separator, and assembling the plurality of first electrode plate groups, the plurality of second electrode plate groups and the first separator to prepare a composite cell group. Cutting the composite cell group to prepare a plurality of thermally composited laminated cells.

Abstract: A thermal composite laminated cell and a battery cell are disclosed by this application. The thermal composite laminated battery cell includes a first cell unit, a second cell unit and a separator with a continuous layer structure, wherein the outermost sides of the first cell unit are negative electrode sheets, and the outermost sides of the second cell unit are positive electrode sheets. The separator with a continuous layer structure includes a plurality of main bodies and a plurality of bent portions all alternately and continuously disposed, the first cell units and the second cell units are alternately disposed in a thickness direction, and the adjacent first cell unit and the second cell unit are separated by the main body.

Abstract: A self-discharge screening method and a self-discharge screening apparatus for lithium-ion batteries (500) are provided. The method includes: sequentially performing high-temperature standing, first room-temperature standing, and second room-temperature standing on batteries to be tested; screening the batteries to be tested according to state parameters of the first standing and the previous two periods of standing; determining physical self discharge rates of the remaining batteries to be tested according to the state parameters of the three periods of standing, and performing physical self-discharge screening on the remaining batteries to be tested. The physical self-discharge rates of the batteries to be tested are determined by using the state parameters, and batteries with non-obvious type physical self-discharge abnormalities are screened out.

Abstract: The disclosure provides a thermal composite laminated cell and a method for preparing the thermal composite laminated cell. The thermal composite laminated cell includes N negative electrode sheets, M positive electrode sheets, and a separator, N is greater than M, and a value of a difference between N and M is 1; the separator includes a plurality of body parts and bending parts alternately and continuously arranged; the negative electrode sheets and the positive electrode sheets are alternately stacked in a thickness direction of the negative electrode sheets, adjacent one of the negative electrode sheets and one of the positive electrode sheets are separated by one of the body parts, the bending parts are provided with incomplete-cut-off structures, and the separator is folded at the incomplete-cut-off structures; two outermost negative electrode sheets are single-sided electrode sheets, and other negative electrode sheets are double-sided electrode sheets.

Abstract: A thermal composite laminated cell and a battery are disclosed. The thermal composite laminated cell is formed by folding a composite unit, and the composite unit includes a first separator, a second separator, first electrode plates and second electrode plates. Portions of the first separator and the second separator are fixedly connected to form pouch-like structures each with an opening. The first electrode plates are placed inside the respective pouch-like structures, and the second electrode plates are alternately arranged at a side of the first separator away from the first electrode plates and at a side of the second separator away from the first electrode plates along the length direction of the composite unit.

Abstract: A method for preparing a laminated battery cell is provided. The method comprises steps of: providing a negative electrode sheet, a positive electrode sheet, and a membrane; thermally bonding the negative electrode sheet and the positive electrode sheet to the membrane to form a thermally bonded structure; forming a plurality of folding structures in the thermally bonded structure, wherein i positive electrode sheets are arranged between every two adjacent folding structures, and i is a positive integer; folding the thermally bonded structure along each straight line where each of the folding structures is located to prepare the laminated battery cell. In the present disclosure, the folded position is fixed, so that the alignment of the positions on both sides of each electrode sheet during folding is improved, and subsequent investment and process of a shaping equipment are eliminated.

Abstract: Disclosed herein is a thermal composite laminated cell comprising a negative electrode, a plurality of positive electrodes, and a separator, the separator comprising a first separator and a second separator, the negative electrode being attached to and between the first separator and the second separator to form a composite laminate comprising a plurality of body portions and a plurality of bending portions arranged alternately and continuously, the bending portions being provided with partially cut structures, the positive electrodes each being arranged between adjacent body portions in a thickness direction of the negative electrode, a projection in the thickness direction of the positive electrode falling completely within a planar area of the body portions. The present application overcomes the problem of poor alignment of the existing composite laminated cell, and has the advantages of good alignment and stable performance.

Abstract: A thermally-compositing laminated cell and a preparation method of a thermally-compositing laminated cell are provided. The cell includes a plurality of first electrode plates, a plurality of second electrode plates and a separator. The polarity of each of the first electrode plates and the polarity of each of the second electrode plates are opposite, and the separator includes a plurality of body portions and a plurality of bending portions disposed alternately and continuously. Along a thickness direction of each of the first electrode plates, the first electrode plates and the second electrode plates are alternately stacked, one of the first electrode plates and one of the second electrode plates adjacent to each other are separated by one of the body portions, and each of the bending portions is provided with an incomplete-cut-off structure, and the separator is folded at the incomplete-cut-off structure.

Abstract: The present disclosure provides a method and apparatus for determining a boundary of an electrode sheet coating and thinning region, an electronic device, and a medium, including: obtaining an initial contour curve from a contour curve set of an initial coating and thinning region of a target electrode sheet; determining an initial ratio of negative electrode capacity to positive electrode capacity according to a material region surface density corresponding to a material region in the target electrode sheet and the initial contour curve; and determining the initial contour curve as a boundary of the initial coating and thinning region if the initial ratio of negative electrode capacity to positive electrode capacity satisfies a preset ratio of negative electrode capacity to positive electrode capacity.

Abstract: The present application provides a battery, a method for manufacturing the battery, and an electric device. The battery includes a positive electrode sheet, a negative electrode sheet, and at least one laminated structure disposed on either the surface of the positive electrode sheet facing the negative electrode sheet or the surface of the negative electrode sheet facing the positive electrode sheet. The laminated structure includes an ion transport layer and an electron insulation layer stacked together. The battery does not include a separator.

Abstract: A laminating device, a processing method for the electrode plate assembly, and a thermally bonding device for electrode plates are provided. The laminating device includes a laminating platform, a first driving roller assembly, and a second driving roller assembly. A first spacing d1 is arranged between the first driving roller assembly and the second driving roller assembly. A length of each of the electrode plate units is L, d1 is less than L, or d1 is greater than L, and a ratio between d1 and Lis a non-integer.

Abstract: An index creation method includes determining, by a storage node, indication information of target data for creating an index, wherein the target data is partial data in a target data table, obtaining, by the storage node, the target data from the target data table based on the indication information, providing the target data to a computing node, and creating, by the computing node, the index based on the target data.

Abstract: A composite electrode, a manufacturing method thereof, and a lithium-ion battery are provided. The composite electrode includes a current collector; and a composite material layer disposed on at least one side surface of the current collector. The composite material layer comprises n-layer active substance layers and n-1-layer lithium supplement layers that are stacked at intervals, in which n is greater than or equal to 3 and n is an integer. A side of the composite material layer which is adjacent to the current collector is one of the n-layer active substance layers. Porosity of the n-1-layer lithium supplement layers gradually increases along a direction away from the current collector.