Abstract: A negative electrode plate including a three-dimensional porous current collector and an insulation layer attached to a side of the three-dimensional porous current collector, where the insulation layer extends from a surface to an interior of the three-dimensional porous current collector, and a thickness of the insulation layer is less than a thickness of the three-dimensional porous current collector is described. A preparation method of the corresponding negative electrode plate, a secondary battery, and an electric apparatus is also described. The negative electrode plate can effectively prevent the growth of lithium dendrites on a surface of the negative electrode plate and inhibit the volume swelling of the electrode, thereby improving the cycling performance and safety performance of the battery.

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: Provided a separator, a preparation method therefor, a secondary battery and a power consuming device. The separator comprises a first substrate layer, a mixed material layer and a second substrate layer; the mixed material layer is provided between the first substrate layer and the second substrate layer; the mixed material layer comprises an inorganic material and a dispersant. The separator of the present application can delay the occurrence of lithium dendrites or sodium dendrites puncturing the separator and the occurrence of internal short circuit in the battery, prolong the service life of the battery, increase the infiltration of the separator to the electrolyte solution and the charge and discharge rate of the battery, improve the thermal shrinkage performance of the battery, and increase the safety and the first coulombic efficiency of the battery.

Abstract: A negative electrode plate, an electrode assembly, a battery cell, a battery, an electric device and a manufacturing method and device for the negative electrode plate are provided. The negative electrode plate includes a foam metal layer, a part of the foam metal layer is a filled region, pores of the filled region are filled with a filler, and the filler is configured to have a projection, in the thickness direction of the foam metal layer, at least partially overlapping with the projection of the coated region of the positive electrode plate.

Abstract: This application discloses a negative electrode plate, and a method for preparing same, and related devices. The negative electrode plate includes a current collector. The current collector is made of a foamed metal material. The current collector includes a first region, a second region, and a third region arranged sequentially along a first direction. An interior of the first region is provided with a negative active material. The second region is filled with an insulation material. The third region is provided with no negative active material. The technical solution hereof ensures that no metal particles are deposited in a tab region in a battery that uses foamed metal as a negative electrode, thereby avoiding a short circuit of a battery cell caused by dendrites arising from surplus metal particles deposited in the tab region, and in turn, enhancing safety performance of the battery.

Abstract: This application discloses an electrode plate, an electrode assembly, a battery cell, a battery, an electrical device, and an electrode plate manufacturing method and equipment. The electrode plate includes a foamed metal layer. A part of the foamed metal layer is a filled region. Pores of the filled region are filled with a filler. The filler extends continuously from one edge to another edge of the foamed metal layer, the two edges being arranged on two opposite sides along a first preset direction. The first preset direction is perpendicular to a thickness direction of the foamed metal layer. In the electrode plate disclosed in this application, a part of the foamed metal layer is configured as a filling region filled with a filler.

Abstract: The present application provides a separator, including first base films sequentially arranged in a stacked manner, a coating containing ceramic particles, graphene oxide and a binder, and a second base film. The separator in the present application has good electrolyte solution wettability, may effectively inhibit the growth of lithium dendrites, and has a small resistance, which may effectively improve the safety, dynamic and cycling performance of a corresponding battery. The present application further provides a secondary battery, battery module, battery pack and electrical apparatus using the separator.

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: A separator includes a first porous base film; a second porous base film; and a supporting layer arranged between the first porous base film and the second porous base film, wherein the supporting layer comprises a polydopamine material and inorganic particles dispersed in the polydopamine material, and has an elastic modulus ?5 Gpa.

Abstract: A separator includes a first porous base film; a second porous base film; and an intermediate layer arranged between the first porous base film and the second porous base film, wherein the intermediate layer comprises an inorganic phase and an organic phase into which the inorganic phase is embedded, the inorganic phase contains an inorganic particle, the organic phase connects the first porous base film with the second porous base film, and the organic phase contains a base film material and does not contain a binder.

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: Provided are a separator comprising a base film and a coating on the base film, wherein the coating comprises a ceramic layer partially embedded in the base film and a boehmite-like layer on the ceramic layer. The separator of the present application may effectively consume lithium dendrites, avoids the lithium dendrites from piercing the separator, and at the same time has a relatively low internal resistance. The present application further provides a method for preparing the separator, and a secondary battery, a battery module using the separator, a battery pack, and a power consuming device.

Abstract: The present application relates to a separator, comprising: two layers of substrate and a coating formed between the two layers of substrate, wherein the coating contains inorganic particles, and 30 wt % to 70 wt % of the inorganic particles have a surface coated with a coating layer, and 70 wt % to 30 wt % of the inorganic particles have an uncoated surface, based on the total weight of the inorganic particle. The separator may realize a high mechanical strength, a high wettability, and a good interfacial bonding, and may also effectively inhibit the growth of lithium dendrites, and thus improve the cycling performance of a secondary battery.

Abstract: An electrode assembly includes a positive electrode layer, a negative electrode layer, and an separator. The positive electrode layer, negative electrode layer, and separator are wound to form the electrode assembly. The separator wraps on both sides of each positive electrode layer and each negative electrode layer. A current collector of the negative electrode layer is made of a three-dimensional porous metal material. The negative electrode layer includes a first negative electrode section and a second negative electrode section extending along a winding direction and connected to each other. A winding start end of the second negative electrode section is substantially aligned with a winding termination end of the positive electrode layer. A thickness d2 of the second negative electrode section is less than a thickness d1 of the first negative electrode section.

Abstract: The present application provides a negative electrode sheet, an electrode assembly, a battery cell, a battery, and an electrical device, belonging to the field of battery technology. The negative electrode sheet includes a porous matrix and a first insulator. The porous matrix has a first surface area in its thickness direction. A first insulator clads at least a partial metal surface of the first surface area. The negative electrode sheet with this structure makes it difficult for lithium ions to obtain electrons on the surface of the porous matrix during use, which can effectively alleviate precipitation of lithium metal and formation of dendritic crystals on the surface of the negative electrode sheet.

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: The present application provides a method and a device for charging a secondary battery, a computer storage medium and electronic equipment. The charging method includes steps of: sending first charge information to a charging source by a battery management system, the first charge information includes a first charge power; performing a constant-power charging on the secondary battery by the charging source according to the first charge power; sending a plurality of pulse discharge information to the charging source by the BMS when a battery status parameter reaches a first predetermined value, each pulse discharge information includes a discharge power and a discharge duration; and performing multiple constant-power pulse discharges on the secondary battery by the charging source according to the discharge power and the discharge duration in the plurality of pulse discharge information.

Abstract: This application provides a battery cell, a battery, an electric apparatus, and a manufacturing method and device of battery cell. The battery cell includes an end cover and a housing, the end cover and the housing forming an accommodating cavity; an electrode assembly accommodated in the accommodating cavity; an insulator configured to isolate the end cover from the electrode assembly; and a protective film fitting around outer circumference of the electrode assembly, the protective film and the insulator being fit together. The protective film and the insulator being fit together does not require hot-melt connection during assembly, thereby avoiding drawing in over-melting, falling off in under-melting, and the like of the protective film caused by hot-melt connection.