Abstract: An electrode assembly and related battery, device, manufacturing method, and manufacturing device are provided. In some embodiments, the electrode assembly includes: a first electrode plate and a second electrode plate that are of opposite polarities, where an active material region of the first electrode plate and an active material region of the second electrode plate are wound to form a body portion, a non-active material region of the first electrode plate or a non-active material region of the second electrode plate is wound to form a tab, and the tab includes a bend portion bent against the body portion; and a guide piece. At least a part of the guide piece is located in the bend portion, and the guide piece is configured to guide an electrolytic solution into an interior of the body portion.

Abstract: Provided are a positive electrode sheet, a secondary battery, and an electrical device. The positive electrode sheet includes: a positive electrode current collector; a primer layer, located on at least one side of the positive electrode current collector, including a conductive agent and a binder; a positive electrode active substance layer, located on one side of the primer layer far away from the positive electrode current collector, including a positive electrode active material; wherein a thickness of the primer layer is denoted as L, and the thickness of the primer layer satisfies: 0.1?L/(Dv50?5)*(PD/3.5)?0.5; wherein Dv50 represents a corresponding particle size when a cumulative particle size distribution number of particles in a volume distribution of the positive electrode active material reaches 50%, and a unit of Dv50 is ?m; PD represents a compacted density of the positive electrode sheet, and a unit of PD is g/cm3.

Abstract: This application relates to a binder, an electrode plate, a secondary battery, and an electric apparatus. A modified polyacrylic acid polymer material has the following structural features. The foregoing modified polyacrylic acid polymer material employs polymerization of four monomers: an acrylic acid, an alkaline metal salt of acrylic acid, a polyethylene glycol acrylate monoester, and acrylonitrile, and is capable of acting as a binder, fully coating the active material in the process of mixing with the active material, lowering the rebound of the electrode plate under extreme design conditions, reducing the cell expansion force during cycling, and increasing the cell life.

Abstract: The present application provides a current collector, electrode plate, cell, battery, device, manufacturing method, and apparatus. The current collector includes a conductive layer and a support layer, wherein the conducive layer is provided on a surface of the support layer, and the support layer includes an insulating base and a support structure embedded in the insulating base to enhance strength of the support layer, which not only increases an overall strength of the current collector and can improve the problem of tape breakage during processing, but also allows strength of the support layer to be close to strength of the conductive layer, narrowing the gap in structural strength between the support layer and the conductive layer, and reducing the difference in deformation between the conductive layer and the support layer during processing, so that it is conducive to improving processing performance of the current collector.

Abstract: This application provides a positive electrode active material. Surface of a first lithium salt is coated with a coating layer containing a second lithium salt, which not only blocks the corrosive decomposition of the first lithium salt by the electrolyte but also allows the second lithium salt to form CEI films in situ on surfaces of the first lithium salt particles, thereby improving the film structure and avoiding the decomposition of active components in the electrolyte. Additionally, the second lithium salt contains both elements fluorine and phosphorus, which makes the composition of the film formed as consistent as possible with the composition of the film formed by lithium hexafluorophosphate in the electrolyte, thereby reducing the consumption of active lithium in the electrolyte. The positive electrode active material of this application can significantly improve the power performance and cycle life of batteries.

Abstract: A composite conductive agent includes an organic polymer, and a hydroxylated carbon nanotube combined with the organic polymer. The organic polymer includes a polymer having a structural formula represented by formula (1), In the formula (1), m is an integer ranging from 2500 to 20000, and R1 is a polymer structure including an ester group and a nitrile group.

Abstract: This application provides a current collecting member, a secondary battery, and a fabrication method. The secondary battery includes an electrode assembly, a housing, a top cover assembly and current collecting members. The electrode assembly includes a main body portion and a first tab extending from an end of the main body portion along a transverse direction. The top cover assembly includes a top cover plate and a first electrode terminal disposed on the top cover plate connected to the housing. The current collecting member is connected to the first tab and the first electrode terminal. The current collecting member includes a substrate and a support plate, the substrate being provided at a side of the main body portion along a transverse direction, the support plate extending from an end part of the substrate in a longitudinal direction, and the first tab being connected to the support plate.

Abstract: The present application provides a cathode plate, a secondary battery, a battery module, a battery pack, and an electric device. The cathode plate includes: a current collector, a conductive coating, and a cathode active layer. The conductive coating is arranged on at least one surface of the current collector. The conductive coating includes a conductive agent having a weight content of 20% to 50% and a binder having a weight content of 50%˜80%. The cathode active layer is arranged on a surface of the conductive coating away from the current collector, and a cathode active material in the cathode active layer is at least one of a lithium manganate-based cathode material, a ternary cathode material, and a quaternary cathode material.

Abstract: The present disclosure provides an electrode assembly and a secondary battery. The electrode assembly includes a first electrode plate, a second electrode plate and a separator. The first electrode plate, the second electrode plate and the separator are wound to a flat structure, and the flat structure comprises a main region and corner regions, the corner regions are provided at two ends of the main region along a width direction of the main region. The first electrode plate and the second electrode plate each are wound to turns. A gap is provided between two adjacent turns of the first electrode plate, the gap includes a first gap and a second gap. The first gap corresponds to the corner region in position, the second gap corresponds to the main region in position, and a dimension of the first gap is larger than a dimension of the second gap.

Abstract: The present application provides a battery cell, a battery, and an electrical apparatus. The battery cell may comprise a case, a cover plate, and a pressure relief apparatus. The case may have an opening; the cover plate may cover the opening, and the cover plate may be welded with the case to form a welding seam; the pressure relief apparatus may be disposed on the cover plate, the pressure relief apparatus may be provided with a weak region, the weak region may be configured to be broken to release internal pressure when the internal pressure or temperature of the battery cell reaches a threshold, and the minimum distance between the edge of the weak region and the welding seam may be greater than or equal to 3 mm.

Abstract: The present disclosure provides an electrode assembly and a secondary battery. The electrode assembly includes a first electrode plate, a second electrode plate and a separator. The first electrode plate, the second electrode plate and the separator are wound to a flat structure, and the flat structure comprises a main region and corner regions, the corner regions are provided at two ends of the main region along a width direction of the main region. The first electrode plate and the second electrode plate each are wound to turns. A gap is provided between two adjacent turns of the first electrode plate, the gap includes a first gap and a second gap. The first gap corresponds to the corner region in position, the second gap corresponds to the main region in position, and a dimension of the first gap is larger than a dimension of the second gap.

Abstract: An electrode assembly and related battery, device, manufacturing method, and manufacturing device are provided. In some embodiments, the electrode assembly includes: a first electrode plate and a second electrode plate that are of opposite polarities, where an active material region of the first electrode plate and an active material region of the second electrode plate are wound to form a body portion, a non-active material region of the first electrode plate or a non-active material region of the second electrode plate is wound to form a tab, and the tab includes a bend portion bent against the body portion; and a guide piece. At least a part of the guide piece is located in the bend portion, and the guide piece is configured to guide an electrolytic solution into an interior of the body portion.

Abstract: An electrode assembly, a battery cell, a battery, a device, a manufacturing method, and a manufacturing device are provided. In some embodiments, the electrode assembly includes at least two electrode plates, including a first electrode plate and a second electrode plate that are of opposite polarities. The first electrode plate and the second electrode plate are wound around a winding axis to form a multilayer structure. The multilayer structure includes an accommodation cavity extending along a direction of the winding axis. The accommodation cavity is configured to accommodate an electrolytic solution. The electrode assembly further includes at least one guide path extending along a first direction. The first direction is a direction perpendicular to the winding axis. The guide path is configured to guide the electrolytic solution out of the accommodation cavity.

Abstract: A battery unit includes: an electrode assembly, including a main body portion, and a negative tab and a positive tab, which respectively extend out from both ends of the main body portion along the length direction; a negative terminal and a positive terminal, arranged at the top of the electrode assembly; a first current collector for electrically connecting the negative tab with the negative terminal; and a second current collector for electrically connecting the positive tab with the positive terminal. The first current collector includes a first guiding plate. The first guiding plate is of a flat plate structure, and the negative tab is bent to one side of the first guiding plate away from the main body portion and is connected with the first guiding plate.

Abstract: An embodiment of the present application provides an electrode assembly, a battery cell, a battery, and a manufacturing method and device for the electrode assembly, which belong to the technical field of batteries. The electrode assembly includes a negative electrode plate and a positive electrode plate. The negative electrode plate includes a negative active material layer located in the straight area, and the positive electrode plate includes a positive active material layer located in the straight area. A first direction is perpendicular to an axial direction of a winding structure. The negative active material layer includes a negative electrode main body portion and negative electrode edge portions located on both sides of the negative electrode main body portion. The electrode assembly of this structure can effectively reduce the risk of lithium plating and improve the safety of the battery.

Abstract: An electrode assembly and a battery cell is disclosed. The electrode assembly includes a first electrode plate and a second electrode plate. The first electrode plate includes a first current collector and a first active material layer, the first current collector includes a first main body and a first tab, and the first tab extends from one end of the first main body in a longitudinal direction. The second electrode plate includes a second current collector and a second active material layer, the second current collector includes a second main body and a second tab, the second tab extends from one end of the second main body in the longitudinal direction, and the second active material layer is applied on a surface of the second main body.

Abstract: This application provides a current collecting member, a secondary battery, and a fabrication method. The secondary battery includes an electrode assembly, a housing, a top cover assembly and current collecting members. The electrode assembly includes a main body portion and a first tab extending from an end of the main body portion along a transverse direction. The top cover assembly includes a top cover plate and a first electrode terminal disposed on the top cover plate connected to the housing. The current collecting member is connected to the first tab and the first electrode terminal. The current collecting member includes a substrate and a support plate, the substrate being provided at a side of the main body portion along a transverse direction, the support plate extending from an end part of the substrate in a longitudinal direction, and the first tab being connected to the support plate.

Abstract: A battery unit includes: an electrode assembly, including a main body portion, and a negative tab and a positive tab, which respectively extend out from both ends of the main body portion along the length direction; a negative terminal and a positive terminal, arranged at the top of the electrode assembly; a first current collector for electrically connecting the negative tab with the negative terminal; and a second current collector for electrically connecting the positive tab with the positive terminal. The first current collector includes a first guiding plate. The first guiding plate is of a flat plate structure, and the negative tab is bent to one side of the first guiding plate away from the main body portion and is connected with the first guiding plate.

Abstract: The present disclosure provides an electrode assembly and a secondary battery. The electrode assembly includes a first electrode plate, a second electrode plate and a separator. The first electrode plate, the second electrode plate and the separator are wound to a flat structure, and the flat structure comprises a main region and corner regions, the corner regions are provided at two ends of the main region along a width direction of the main region. The first electrode plate and the second electrode plate each are wound to turns. A gap is provided between two adjacent turns of the first electrode plate, the gap includes a first gap and a second gap. The first gap corresponds to the corner region in position, the second gap corresponds to the main region in position, and a dimension of the first gap is larger than a dimension of the second gap.

Abstract: The present application provides a positive electrode material, a method for preparing the same and a Li-ion battery containing the positive electrode material, wherein, the positive electrode material is represented as Li1+xNiaCobMncMdO2, in which M is selected from one or more of Mg, Ti, Zn, Zr, Al and Nb. The positive electrode material provided by the present application has a small crystal volume and a small Li—Ni synchysis degree. In addition, after the positive electrode material provided by the present application is applied to a Li-ion battery, the Li-ion battery possesses a better cycle performance, a higher initial charge-discharge efficiency and a better power property. Moreover, in the present application, a precursor is prepared by a coprecipitation method, and then the precursor is sintered together with a Li source and a metal oxide to obtain the positive electrode material.