Abstract: A receiving terminal device displays a file receiving page with a receiving control for a target file on the file receiving page. In response to a trigger operation on the receiving control, and during a process of an uploading of the target file by a transmitting terminal device, a downloading of content of the target file is started when the target file is being uploaded by the transmitting terminal device. A file download page of the target file with file transmitting state information on the file download page is displayed, the file transmitting state information indicates that the transmitting terminal device is uploading the target file. When the transmitting terminal device completes the uploading of the target file, download progress information indicating that partial content of the target file has been downloaded is displayed on the file download page. Apparatus and non-transitory computer-readable storage medium counterpart embodiments are also contemplated.

Abstract: Provided are a battery cell, a battery, a power consumption device, and a manufacturing method for a battery cell. The battery cell includes a housing, a protective member, a cell, an elastic member, a first gas-permeable component and a second gas-permeable component. The protective member is mounted on an inner wall of the housing and separates an inner space of the housing into a first chamber and a second chamber, the cell is disposed in the first chamber, the elastic member is disposed in the second chamber and located between the housing and the protective member, the protective member is configured such that the elastic member is compressed with expansion of the cell and stretched with contraction of the cell.

Abstract: A current collector may comprise a strength enhancement layer and a current collecting layer, wherein the current collecting layer may be stacked and bonded with the strength enhancement layer, and the current collecting layer may comprise a foam metal portion and a solid metal portion.

Abstract: An Mn-M binary multi-phase alloy has Mn content satisfying 39 wt %?Mn?78 wt %, with the balance including metal M. The standard electrode potential of the metal M is higher than the standard electrode potential of Mn, and an ?Mn phase, a ?M-Mn phase, and a ??Mn-M phase are distributed in the binary metal multi-phase alloy. A method for preparing the Mn-M binary multi-phase alloy, a use thereof in preparation of a porous material, a current collector including the porous material, a secondary battery, and an electrical device.

Abstract: A porous metal structure and a preparation method for the same. The preparation method for the porous metal structure includes the following steps: performing first de-alloying treatment on an alloy foil to form pores, then performing reduction annealing treatment in a reducing gas atmosphere, and finally performing second de-alloying treatment to obtain the porous metal structure.

Abstract: A method includes: providing a cold-rolled alloy foil material; carrying out recrystallization annealing treatment on the alloy foil material, and then carrying out first cooling treatment to obtain an alloy foil material having a first component phase; carrying out phase separation thermal treatment on the alloy foil material, and then carrying out second cooling treatment to separate out a second component phase and obtain an alloy foil material having both the first and second component phase, where the temperature of the phase separation thermal treatment is smaller than the temperature of the recrystallization annealing treatment, and an average cooling rate of the second cooling treatment is smaller than an average cooling rate of the first cooling treatment; and carrying out dealloying treatment on the alloy foil material, carrying out reduction annealing treatment in a reducing gas atmosphere, and carrying out third cooling treatment to obtain a porous metal structure.

Abstract: A preparation method for the three-dimensional porous copper comprises the following steps: providing a copper alloy matrix, wherein the copper alloy matrix comprises a Cu element and a non-Cu metallic element, and the standard electrode potential of the non-Cu metallic element is less than that of the Cu element; providing a corrosive liquid, wherein the corrosive liquid comprises a neutral salt, a weakly acidic complexing agent, and a solvent, the molar concentration of the neutral salt is recorded as C1, the molar concentration of the weakly acidic complexing agent is recorded as C2, the molar concentrations are both in the unit of mol/L, 0.04?C2/C1?0.60, and C2 is less than or equal to 0.20 mol/L; and using the corrosive liquid as an electrolyte to perform electrochemical corrosion on the copper alloy matrix so as to obtain three-dimensional porous copper.

Abstract: An electrode assembly, a battery cell, a battery, and an electrical device are described. The battery cell includes a negative electrode plate and a positive electrode plate. The negative electrode plate includes a porous current collector and a first tab connected to at least one end of the porous current collector. The positive electrode plate includes a body portion and a second tab connected to at least one end of the body portion. The body portion and the porous current collector are stacked along a thickness direction of the porous current collector. Along a first direction, neither end of the porous current collector extends beyond the body portion. The first direction is perpendicular to the thickness direction of the porous current collector.

Abstract: A method for treating a manganese-copper mixed solution is disclosed, including the following steps: adjusting a pH value of the manganese-copper mixed solution to 6.5 to 7 to obtain a solution defined as a first solution; adding an oxidant into the first solution to obtain a solution defined as a second solution, where the oxidant reacts with Mn2+ at a pH value of 6.5 to 7 to generate MnO2; and collecting a first precipitate. This method is time-saving in separating manganese ions, and can recover high-purity manganese ions. The recovered waste liquid is treated by a simple method and causes little pollution to the environment.

Abstract: An electrode assembly, a battery cell, a battery, and an electrical device are described. The battery cell includes a negative electrode plate and a positive electrode plate. The negative electrode plate includes a porous current collector and a first tab connected to at least one end of the porous current collector. The positive electrode plate includes a body portion and a second tab connected to at least one end of the body portion. The body portion and the porous current collector are stacked along a thickness direction of the porous current collector. Along a first direction, neither end of the porous current collector extends beyond the body portion. The first direction is perpendicular to the thickness direction of the porous current collector.

Abstract: A battery cell includes a positive electrode sheet, a negative electrode sheet and an insulation layer. The positive electrode sheet includes a coating layer. The negative electrode sheet includes a porous current collector and a first tab connected to at least one end of the porous current collector. Along a thickness direction of the porous current collector, the porous current collector and the coating layer are arranged facing each other, and along a first direction, the porous current collector has an extension section beyond the coating layer, where the first direction is perpendicular to the thickness direction of the porous current collector. The insulation layer is disposed corresponding to the extended section, and along the thickness direction of the porous current collector, the projection of the insulation layer on the porous current collector covers part or all of the extended section.

Abstract: The present application provides a composite separator, an electrochemical energy storage apparatus, and an electrical apparatus. The composite separator provided in a first aspect of the present application may comprise: a first base film and a second base film; and an anode protection layer located between the first base film and the second base film in a thickness direction of the composite separator, for capturing transition metal ions. The anode protection layer for capturing transition metal ions may be arranged between the first base film and the second base film to prevent the anode protection layer from falling off from an outer surface of the base films during prolonged use, so that the anode protection layer can have more stable anode protection effects in prolonged use of the electrochemical energy storage apparatus, and improve the application performance of the electrochemical energy storage apparatus.

Abstract: A conductive film includes: a substrate, where the substrate has a first surface and a second surface facing away from each other, and the substrate has a dense structure; and a first porous layer, where the first porous layer is stacked and bonded to the first surface of the substrate; the first porous layer includes a porous conductive material; and the porous conductive material has pores with first pore size and pores with second pore size; the first pore size being n micrometers, where 0.5?n?10; and the second pore size being m nanometers, where 20<m<200.

Abstract: A conductive film includes: a substrate, where the substrate has a first surface and a second surface facing away from each other, and the substrate has a dense structure; and a first porous layer, where the first porous layer is stacked and bonded to the first surface of the substrate; the first porous layer includes a porous conductive material; and the porous conductive material has pores with first pore size and pores with second pore size, the first pore size being n micrometers, where 0.5?n?10; and the second pore size being m nanometers, where 20<m<200.

Abstract: An electrode sheet, a battery cell, a battery, an electrical device, and a manufacturing method for the electrode are provided. The electrode sheet includes a porous current collector, the porous current collector includes a main body and an end portion which are integrally formed, the weight per unit volume of the end portion is larger than the weight per unit volume of the main body, the thickness of the end portion is smaller than the thickness of the main body, the thickness of the end portion is D1, satisfying 5 ?m?D1?100 ?m.

Abstract: This application provides a negative electrode plate and a method for preparing same. In the method, a metal foil is connected to a foamed metal current collector by roll welding, so as to form the negative electrode plate. The metal foil forms a tab of the negative electrode plate, and the foamed metal current collector includes a foamed metal layer of a porosity of 60% to 99%, and optionally 80% to 85%. The method reduces or avoids flying metal chips and cold solder joints, and improves mechanical strength and electrical conductivity of the electrode plate. This application also provides a negative electrode plate prepared by the method, a secondary battery containing the negative electrode plate, and an electrical device.

Abstract: This application provides a porous material and a preparation method thereof, a current collector, a secondary battery, and an apparatus. The porous material has pores of a first pore size and pores of a second pore size. The second pore size is m nanometers, and 10<m<400; and the first pore size is n micrometers, and 0.5?n?20. An apparent volume of the porous material is V, a total pore volume of the pores of the second pore size is V2, a total pore volume of the pores of the first pore size is V1, and the porous material satisfies the following relationships: (V1+V2)/V=20%?90%, V2/V=15%?70%, and V1/V=5%?70%.

Abstract: Provided are a battery cell, a battery, a power consumption device, and a manufacturing method for a battery cell. The battery cell includes a housing, a protective member, a cell, an elastic member, a first gas-permeable component and a second gas-permeable component. The protective member is mounted on an inner wall of the housing and separates an inner space of the housing into a first chamber and a second chamber, the cell is disposed in the first chamber, the elastic member is disposed in the second chamber and located between the housing and the protective member, the protective member is configured such that the elastic member is compressed with expansion of the cell and stretched with contraction of the cell.

Abstract: A battery unit includes an electrode assembly and a support component. The electrode assembly includes a positive electrode plate and a negative electrode plate that have opposite polarities, and a separator separating the positive electrode plate and the negative electrode plate. The electrode assembly is wound around an outer periphery of the support component. An outer peripheral wall surface of the support component includes a first arc surface and a second arc surface. A first end of the first arc surface is connected to a first end of the second arc surface, and a second end of the first arc surface is spaced apart from a second end of the second arc surface so as to form a step region on the outer peripheral wall surface. The step region is configured to accommodate at least part of the electrode assembly.

Abstract: The present application provides a composite separator, an electrochemical energy storage apparatus, and an electrical apparatus. The composite separator provided in a first aspect of the present application may comprise: a first base film and a second base film; and an anode protection layer located between the first base film and the second base film in a thickness direction of the composite separator, for capturing transition metal ions. The anode protection layer for capturing transition metal ions may be arranged between the first base film and the second base film to prevent the anode protection layer from falling off from an outer surface of the base films during prolonged use, so that the anode protection layer can have more stable anode protection effects in prolonged use of the electrochemical energy storage apparatus, and improve the application performance of the electrochemical energy storage apparatus.