Abstract: The present application discloses a winding method and a winding system, and relates to the technical field of battery fabrication. The winding method includes: obtaining a first parameter and a second parameter of each electrode assembly on a winding needle in real time, the first parameter being any one of a number of winding layers, a sheet length and a winding roll diameter, and the second parameter being one or both of the remaining two of the number of winding layers, the sheet length and the winding roll diameter; comparing the second parameters respectively with corresponding preset parameter ranges, the preset parameter ranges being the ranges of the second parameters corresponding to the first parameters of preset standard models corresponding to the electrode assemblies; and adjusting, in response to the second parameter exceeding the corresponding preset parameter range, sheets to be wound of the corresponding electrode assembly.

Abstract: An electrode assembly, a battery cell, a battery, and an electrical apparatus are disclosed. The electrode assembly includes a first electrode plate, the electrode plate includes a current collector and active material layers arranged on the current collector, the active material layer is provided with a plurality of material removal regions at intervals in an extension direction (L) of the first electrode plate, and the material removal region extends in a width direction (Y) of the first electrode plate; the active material layer is provided with a marking portion, a width of the marking portion in the extension direction (L) of the first electrode plate is greater than or equal to a width of the material removal region, and the marking portion spans across the material removal region.

Abstract: This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes an electrode assembly. The electrode assembly includes a positive electrode plate, a negative electrode plate, a separator, an insulation layer, and an adhesive layer. The positive electrode plate, the separator, and the negative electrode plate are stacked and wound, and the electrode assembly has bent regions. At least a portion of the insulation layer and at least a portion of the adhesive layer are disposed in the bent region, and the insulation layer is adhered to the positive electrode plate or the negative electrode plate through the adhesive layer. In a thickness direction of the insulation layer, a projected area of the adhesive layer is smaller than a projected area of the insulation layer.

Abstract: This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes at least one electrode assembly. The electrode assembly includes a positive electrode plate, a negative electrode plate, a separator, and a porous insulation layer. The positive electrode plate, the separator, and the negative electrode plate are stacked and wound. At least a portion of the porous insulation layer is disposed in a bent region of the electrode assembly, and the porous insulation layer is disposed between the positive electrode plate and the separator or disposed between the negative electrode plate and the separator. Based on the above structure, the service life of the battery cell can correspondingly be prolonged, and the safety of the battery cell can correspondingly be improved.

Abstract: A bouncing drainer includes a bouncing machine core and a water filter basket assembly. The bouncing machine core is inverted, where one end with a protruding tip facing upwards and the other end facing downwards, so as to avoid the interference between the protruding tip and a drainage outlet. The water filter basket assembly includes a sleeve, a water filter basket, and a sealing ring. The sleeve is mounted at the top of the bouncing machine core in a sleeving manner, and wraps the protruding tip of the bouncing machine core. The water filter basket and the sealing ring are mounted on the sleeve in sequence from top to bottom. According to the application, through the adoption of the inverted bouncing machine core, which solves the problem that a traditional bouncing drainer is not suitable for some vegetable washing basins.

Abstract: An electrode plate manufacturing device and an electrode plate manufacturing method are provided. The electrode plate manufacturing device includes an extrusion mechanism, a film forming mechanism and a combination mechanism. The extrusion mechanism is used to extrude out the active material slurry to form a blank. The film forming mechanism is provided downstream of the extrusion mechanism, and the film forming mechanism is used to thin the blank to form a film. The combination mechanism is provided downstream of the film forming mechanism, and the combination mechanism is used to combine the film and a substrate to form an electrode plate. The electrode plate manufacturing device extrudes, through the extrusion mechanism, the active material slurry out to form a blank, so that the powder and particles in the active material slurry may be mixed evenly. The blank is formed into a film through the film forming mechanism.

Abstract: A film preparation apparatus includes a single-screw machine and an extrusion die. The single-screw machine is configured for conveying and extruding an active material mixture, and the extrusion die is connected with a discharge end of the single-screw machine and configured for extruding out an active material film. A screw of the single-screw machine includes a compression section, an axial length of the compression section is L1, an axial length of the screw is L, and 0.45?L1/L?0.65.

Abstract: An electrode assembly includes a water-based positive electrode plate and a negative electrode plate, wherein the water-based positive electrode plate includes a positive electrode current collector and a positive electrode film layer located on at least one surface of the positive electrode current collector; and the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector; at least part of surface of the water-based positive electrode plate is provided with a plurality of first micropores, and satisfies: 0.001%?(S12×H12×D1)/(S11×C1×H11)?1%, at least part of surface of the negative electrode plate is provided with a plurality of second micropores, and satisfies: 0<(S22×H22×D2)/(S21×C2×H21)?2.5%.

Abstract: A cell winding calibration method includes: obtaining a first reference distance between first and second reference lines; obtaining a reference number of pixels included in the first reference distance, and determining, based on the first reference distance and the reference number of pixels included in the first reference distance, an actual distance corresponding to a single pixel; obtaining an actual number of pixels included in a distance between an edge of a winding substrate and the first or second reference line, and determining real-time position information of the edge of the winding substrate based on the actual number of pixels included in the distance between the edge of the winding substrate and the first or second reference line and the actual distance corresponding to a single pixel; and calibrating the winding substrate based on the real-time position information of the edge of the winding substrate.

Abstract: An extrusion coating apparatus includes a housing having an inner chamber, a housing wall of the housing having a feed port and a coating outlet both communicated with the inner chamber, the coating outlet being in a slit shape; and further includes a porous structure disposed in the inner chamber and located on a material flow path between the feed port and the coating outlet, so that at least a portion of a material passes through the porous structure.

Abstract: A pole piece manufacturing device is described. The pole piece manufacturing device includes a membrane forming mechanism, a composite mechanism, a detection mechanism and an adjustment mechanism. The membrane forming mechanism is configured to form an active substance into a membrane. The composite mechanism is configured to composite the membrane and a substrate into a pole piece. The detection mechanism is is configured to detect a thickness or a weight per unit area of the membrane. The adjustment mechanism is configured to adjust the membrane forming mechanism according to detection results of the detection mechanism, so as to control the thickness or the weight per unit area of the membrane within a preset range. The membrane is detected by providing the detection mechanism. When the membrane does not meet the design requirements, the membrane forming mechanism is adjusted timely through the adjustment mechanism to make it meet the design requirements.

Abstract: The present application provides a negative electrode slurry, and a method for preparing the same, as well as a negative electrode plate, a secondary battery, a battery module, a battery pack, and an electrical apparatus thereof, where the negative electrode slurry comprises a negative electrode binder, and the negative electrode binder comprises a polymer composed of a building block represented by formula (I). The negative electrode binder in the present application is used to effectively improve the problem of roller sticking of the negative electrode plate during cold pressing, and the negative electrode binder and the negative electrode active material are better cladded, thereby reducing solid electrolyte interface reconstruction during cycles, and improving cycling performance and storage performance of the secondary battery.

Abstract: Provided are a winding mandrel, a winding machine, and a battery cell winding method. The winding mandrel includes a first connecting member and a second connecting member configured to be combined with the first connecting member. The second connecting member and the first connecting member are arranged coaxially, and length of the combined first connecting member and second connecting member is greater than length of the first connecting member or the second connecting member. Changing a structure of a winding mandrel improves stiffness of the winding mandrel and improves the efficiency and quality of a winding operation.

Abstract: Embodiments of this application relate to the field of electrode assembly winding technologies and specifically to a winding device and a winding method. The device includes: a winding mandrel configured to wind a roll material, where the winding mandrel includes a magnetic portion, the magnetic portion being disposed along an axial direction of the winding mandrel; and a magnetism supply assembly configured to provide a magnetic field, where the magnetism supply assembly is disposed in correspondence with the magnetic portion, and the magnetic field interacts with the magnetic portion to generate a magnetic force so as to resist deformation of the winding mandrel. The winding device decreases the deformation of the winding mandrel and reduces the risk of displacement or wrinkles of electrode assemblies during winding.

Abstract: An electrode assembly includes a water-based positive electrode plate and a negative electrode plate, wherein the water-based positive electrode plate includes a positive electrode current collector and a positive electrode film layer located on at least one surface of the positive electrode current collector; and the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector; at least part of surface of the water-based positive electrode plate is provided with a plurality of first micropores, and satisfies: 0.001%?(S12×H12×D1)/(S11×C1×H11)?1%, at least part of surface of the negative electrode plate is provided with a plurality of second micropores, and satisfies: 0<(S22×H22×D2)/(S21×C2×H21)?2.5%.

Abstract: Some embodiments of this application provide an injection nozzle and an injection apparatus containing same. The injection nozzle includes a body, an injection pipe, and a baffle. The body contains a channel arranged along a height direction of the injection nozzle. A first outlet is disposed at a lower part of the channel. The injection pipe is threaded through the channel in a manner of reciprocating movement along the height direction. The baffle is connected to the body and configured to cover the first outlet when a lower end portion of the injection pipe is higher than the first outlet, and be propped open by the injection pipe when the lower end portion of the injection pipe is lower than the first outlet.