Abstract: A binding piece includes an insulation layer, a substrate layer, and at least one binding layer stacked together; where one of the at least one binding layer forms on an outer surface of the binding piece; where 10%?L2?100%, 1.2?L1/L2?20, L1 is an elongation rate of the insulation layer, and L2 is an elongation rate of the substrate layer.

Abstract: An electrochemical apparatus includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate, where the negative electrode plate includes a negative electrode current collector and a negative electrode active substance layer disposed on the negative electrode current collector, where the electrochemical apparatus has a first capacity a in the unit of mAh, the first capacity a is greater than 0, and the first capacity a represents a capacity when a battery that is prepared using the negative electrode plate and a lithium plate as a counter electrode of the negative electrode plate is charged to 2.0 V after the electrochemical apparatus has been discharged from a 100% state of charge (SOC) to 2.5 V.

Abstract: A current collector includes: an organic support layer; a conductive layer; an intermediate coating disposed between the organic support layer and the conductive layer, wherein the intermediate coating includes a resin composition at least including a first resin and a second resin; the adhesion of the first resin to the organic support layer is less than the adhesion of the second resin to the organic support layer; the adhesion of the first resin to the conductive layer is less than the adhesion of the second resin to the conductive layer.

Abstract: A battery includes a housing, a cover, a sealing member, a connecting member, a cell, and a pole. The pole includes a substrate and a lead-out portion disposed on the substrate, where the lead-out portion includes a first portion, a second portion, and a mounting hole. The second portion is connected to an end of the first portion away from the substrate. The mounting hole is connected to the first portion and the second portion, where an opening of the mounting hole is located in the second portion. In a direction parallel to the substrate, minimum cross-sectional area of the first portion is greater than maximum cross-sectional area of the second portion. The pole has the first portion and the second portion of different cross-sectional areas disposed on the lead-out portion so that the second portion can be more easily riveted and bent against the first portion during riveting.

Abstract: A separator includes: a first porous substrate; and a second porous substrate arranged on at least one surface of the first porous substrate; wherein the elongation at break of the second porous substrate is greater than the elongation at break of the first porous substrate in at least one of the machine and transverse directions of the separator. The separator has a high tensile strength and an elongation at break and good heat resistance, and may improve the safety performance of the energy storage device when the separator is applied to the energy storage device.

Abstract: A battery module includes a battery module, which includes a battery unit and a casing for receiving the battery unit. The casing includes a first casing body, a second casing body assembled to the first casing body, and a first sealing ring disposed between the first casing body and the second casing body. The first casing body includes a first cover plate and first sidewalls connected to edges of the first cover plate. A slot is defined on outer surface of the first sidewalls. The second casing body includes a second cover plate and second sidewalls connected to edges of the second cover plate. A latch is disposed at inner surface of the second sidewalls, corresponding to the slot. The latch is configured to be received in the slot, locating and sealing the second cover plate on the first cover plate by compressing the first sealing ring.

Abstract: An electrochemical device includes an electrode plate, the electrode plate includes: a first current collector; a first tab protruding from the first current collector; a first active material layer disposed on at least one surface of the first current collector; and an insulation layer disposed along a side edge of the first current collector towards the first tab and abutted against the first active material layer. The insulation layer includes a first region and a second region, the first region is disposed towards the first tab, the second region is disposed away from the first tab and abutted against the first active material layer, and a thickness of the first region of the insulation layer is less than a thickness of the second region of the insulation layer.

Abstract: A battery pack, including a housing, a circuit board, and a plurality of electrode assemblies. The housing includes a first surface and a second surface opposite to each other. The first surface is provided with a plurality of first slots. The battery pack further includes a plurality of first caps, and the plurality of first caps respectively cover the plurality of first slots to form a plurality of mutually separated accommodation spaces. The electrode assemblies each includes an electrode plate assembly, a first electrode tab, and a second electrode tab. The electrode plate assembly is accommodated in the accommodating space. The first tab and the second tab extend out of the accommodating space. At least one first electrode tab and at least one second electrode tab are electrically connected to the circuit board. The structure and the manufacturing process of the battery pack can be simplified.

Abstract: An electrode plate includes a current collector and membranes disposed on a surface of the current collector, where at least one of the membranes is provided with a tab slot, the tab slot is apart from an edge of the electrode plate along a width direction, and the tab slot exposes the surface of the current collector; the membrane provided with the tab slot is provided with a notch connecting to the tab slot on a side, where the notch runs through the current collector along a direction perpendicular to the membrane, and the notch has an arc-shaped surface. The risk of a short circuit in the electrode assembly having the electrode plate can be decreased and safety performance of the battery can be improved.

Abstract: A battery includes a packaging shell and a battery cell. The battery cell is disposed in the packaging shell, the battery cell includes a first electrode plate, the first electrode plate includes a first empty foil area and a second empty foil area where no active material is disposed on either side of the first electrode plate. The first empty foil area is arranged on a first surface, the second empty foil area is arranged on a second surface. At least one of the first surface and the second surface is adhered to the packaging shell by a bonding member. In a width direction of the battery cell, a width of the battery cell is W, a width of the first empty foil area is W1, a width of the second empty foil area is W2, and 0?(W1+W2)/W?40%.

Abstract: The present application relates to a composite separator, and an electrochemical device and an electronic device comprising the same. Some embodiments of the present application provide a composite separator, comprising: a first porous substrate and a cation exchange layer, wherein the cation exchange layer comprises a second porous substrate grafted with a functional group, wherein the functional group is selected from the group consisting of an alkali-metal-sulfonic functional group, an alkali-metal-phosphoric functional group and a combination thereof. The composite separator of the present application can effectively capture the transition metal ions eluted from a cathode through the cation exchange layer, thereby reducing the deposition of the transition metal ions on an anode and the self-discharge rate of the electrochemical device.

Abstract: A cathode includes a current collector, a first material layer and a second material layer. The first material layer includes a first material. The second material layer includes a second material. The second material includes at least one of the followings compounds: phosphate represented by a general formula M1PO4 and lithium titanium phosphate represented by a general formula Li3Ti2-x M2x(PO4)3, and the second material layer is disposed between the current collector and the first material layer. The cathode of the present application is provided with a double-layer structure including at least one of phosphate and lithium titanium phosphate to avoid direct contact between the current collector in the cathode and an anode material layer and optimize the stability of the first material layer, so that the cycle performance, electrochemical stability and safety performance of the electrochemical device are significantly improved.

Abstract: An electrochemical device includes a positive electrode, the positive electrode includes a positive electrode active material layer, the positive electrode active material layer includes a positive electrode active material and a composite carbon material. A is a volume of the positive electrode active material layer, B is a volume of pores having a pore diameter of less than 2 ?m in the positive electrode active material layer, and 14%?B/A?20%. The positive electrode active material layer includes the positive electrode active material and the composite carbon material, and 14%?B/A?20%, and indicates that the formed positive electrode has abundant pores for lithium ion transport.

Abstract: A negative active material includes composite particles. The composite particle includes a first region and a second region, where the first region includes a disordered carbon structure, and the second region includes an ordered carbon structure and/or a metal oxide structure. The negative active material of this application has a high gram capacity and active ion diffusion coefficient, so that a secondary battery containing such negative active material has a high energy density and excellent cycling performance, rate performance, and fast charging capacity.

Abstract: An electrode assembly includes a first electrode plate, a separator, and a second electrode plate that are disposed in a stack. The first electrode plate and the second electrode plate respectively have coating areas and empty foil areas arranged at intervals. Centers of the coating areas overlap each other to form a coating portion of the electrode assembly, and centers of the empty foil areas overlap each other to form a flexible portion of the electrode assembly. The first packaging layer coats the coating portion and the flexible portion of the electrode assembly, and the second packaging layer at least coats the first packaging layer on the flexible portion.

Abstract: Provided are a coating apparatus and a coating system, where the coating apparatus includes: a coating module, the coating module including a coating roller and a coating die, where the coating roller is configured to drive, when rotating, a substrate to move toward the coating die, and the coating die is configured to apply a coating onto the substrate; an error acquisition module having a predetermined distance to the coating roller and configured to acquire a circular run-out error of rotation of the coating roller and transmit the circular run-out error to a linkage module; and the linkage module configured to adjust position of the coating die in real time according to the circular run-out error transmitted to the linkage module, so as to keep a distance between the coating roller and the coating die unchanged.

Abstract: This application relates to the field of batteries, and in particular, to an electrode assembly and a manufacturing method therefor, a battery cell, a battery, and an electric apparatus. The electrode assembly may include: a first electrode plate, being folded back and forth in a first direction so that the first electrode plate includes a plurality of first laminates connected and stacked in sequence; and a second electrode plate, being opposite the first electrode plate in polarity and being folded once in a second direction so that the second electrode plate includes two second laminates connected to each other, where the second direction may be perpendicular or parallel to the first direction, and the second laminates and the first laminates may be alternately stacked in sequence.

Abstract: An electrochemical device includes a housing, an insulator, a connecting strip and a feedthrough connector. The housing defines an accommodation cavity and includes a cover having a second surface. The cover includes a first through-hole. A second through-hole of the connecting strip communicates with the first through-hole. The insulator is fitly connected to the connecting strip. The insulator includes a third through-hole communicating with the second through-hole. A first part of the feedthrough connector is fitly connected to a surface of the insulator being away from the connecting strip. The first part covers the third through-hole. One end of a second part of the feedthrough connector is connected to a surface of the first part oriented toward the connecting strip. The second part extends away from the first part and is partly disposed in the first through-hole, the second through-hole, and the third through-hole.

Abstract: A negative electrode plate includes: a negative current collector; a first negative active material layer close to the negative current collector and disposed on at least one surface of the negative current collector, where the first negative active material layer includes a first negative active material; and a second negative active material layer. The second negative active material layer includes a second negative active material. The first negative active material layer is located between the second negative active material layer and the negative current collector. An interlayer spacing of the first negative active material is smaller than an interlayer spacing of the second negative active material.

Abstract: A method for improving cycling performance of a battery includes, in a first stage, charging the battery with a first-stage current until a voltage of the battery reaches a first-stage voltage value and in a second stage, charging the battery with a second-stage current until the voltage of the battery reaches a second-stage voltage value. The second-stage voltage value is greater than the first-stage voltage value, and the second-stage current is less than the first-stage current.