Abstract: An electrode assembly includes a first electrode plate, a second electrode plate, and a separator located between the first electrode plate and the second electrode plate; the first electrode plate includes a first current collector and a first membrane disposed on the first current collector, and the first membrane is provided with a first tab groove; and the second electrode plate includes a second current collector and a second membrane disposed on the second current collector, the second membrane is provided with a blocking groove and an alignment region defined by the blocking groove, and a projection of the alignment region on the first electrode plate covers the first tab groove.

Abstract: A battery case short-circuit processing method and system are provided. The battery case short-circuit processing method includes: when a short circuit between a case of a battery and a first electrode of the battery is detected, connecting the case and a second electrode of the battery by shorting, wherein if the first electrode is a positive electrode, the second electrode is a negative electrode; and if the first electrode is a negative electrode, the second electrode is a positive electrode; disconnecting the case of the battery from the second electrode, and carrying out standing of the battery for a preset duration; after the standing duration of the battery, detecting a potential difference between the case and the first electrode.

Abstract: The present application provides a battery including an electrode assembly, a package encapsulating the electrode assembly, and a plurality of bonding portions located between the package and the electrode assembly, wherein at least partially of the bonding portions are disposed at interval. The purpose of the present application is to provide a battery that reduces the tear risk of the aluminum foil and improves safety.

Abstract: A positive electrode active material, where a surface region of the positive electrode active material includes a specific content of element aluminum. The positive electrode material of this application helps to improve the impedance, cycling performance, and high-temperature storage performance of electrochemical apparatuses under high-voltage operating conditions.

Abstract: An electrochemical device includes a positive electrode, the positive electrode including a positive electrode current collector, a protective coating disposed on a surface of one side of the positive electrode current collector close to a tab portion, and a positive electrode active material layer disposed on a surface of at least one side of the positive electrode current collector. The protective coating includes a first active material, and the positive electrode active material layer includes a second active material. According to embodiments of this application, by disposing the protective coating on the positive electrode current collector, lithium plating at the negative electrode of the electrochemical device is alleviated while ensuring the safety performance of the electrochemical device.

Abstract: A negative electrode includes a current collector and a negative active material layer disposed on the current collector. The negative active material layer includes negative active material particles. The negative active material particles include secondary particles. The negative active material layer includes a pore A. A diameter of the pore A is 59 nm to 73 nm when tested by a mercury intrusion porosimetry. A ratio C004/C110 of the negative active material layer is 6 to 20. The electrochemical device using the negative electrode according to this application possesses a relatively high capacity and improved performance of resistance to cycle expansion.

Abstract: A positive electrode, including a current collector and a positive electrode active material layer provided on the current collector, the positive electrode active material layer including a lithium transition metal composite oxide, where in a direction parallel to a plane on which the current collector is located, an average particle size of the lithium transition metal composite oxide is Dp, and in a direction perpendicular to the plane on which the current collector is located, an average particle size of the lithium transition metal composite oxide is Dv, satisfying: 1.1?Dp/Dv?2.3.

Abstract: An electrode assembly, where an outer surface of the electrode assembly includes a first surface, a first end face, a second surface, and a second end face that are connected in sequence, the first surface is provided opposite to the second surface, and the first end face is provided opposite to the second end face; a first adhesive layer, where the first adhesive layer is adhered to the first end face and extends from the first end face to the first surface and the second surface separately, and a side of the first surface provided with the first adhesive layer is defined as a top side; and a second adhesive layer, where the second adhesive layer is adhered to the second end face and extends from the second end face to the first surface and the second surface separately.

Abstract: A battery including a first conductive part, an electrode assembly, a second conductive part, and a first layer. The first conductive part includes a cover part and a concave part connected to the cover part. The concave part includes a first wall and a first side wall connected to the first wall. The electrode assembly is electrically connected to the first conductive part and the second conductive part, and is configured inside the concave part. Viewed in a first direction, the second conductive part and the electrode assembly partly overlap, the second conductive part is located in the first conductive part, the second conductive part includes a first surface and a second surface, and the second surface faces away from the first conductive part. The first layer includes a part located between the first conductive part and the second conductive part; and an insulating material.

Abstract: An electrolyte and an electrochemical apparatus containing the electrolyte. The electrolyte includes a fluorine-containing sulfonimide lithium salt and a trinitrile compound, where based on a weight of the electrolyte, a percentage of the fluorine-containing sulfonimide lithium salt is X %, and a percentage of the trinitrile compound is Y %, where 1?X+Y?6. The electrolyte in this application can significantly improve safety performance of lithium-ion batteries.

Abstract: A binder is a polymer including structural units represented by a formula I, a formula II, and a formula III. R1 is selected from any one of a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, or a substituted or unsubstituted C6-C20 aryl group; R2 is selected from a phenolic hydroxyl group and the number of phenolic hydroxyl groups is 2 to 5; R3 is one of C, S, N, or P; X is selected from any one of Li, Na, or K; R4 and R5 each are independently selected from one of a hydrogen atom, a substituted or unsubstituted C1-C10 alkyl group, a substituted or unsubstituted C2-C10 alkenyl group, a substituted or unsubstituted C2-C10 alkynyl group, or a substituted or unsubstituted C6-C20 aryl group; and n1, n2, and n3 each are independently an integer greater than zero.

Abstract: A positive electrode includes a current collector and a positive electrode mixture layer provided on at least one surface of the current collector, the current collector includes a first region and a second region, the first region is coated with the positive electrode mixture layer, the second region is a foil-free region of the positive electrode, the positive electrode mixture layer includes a positive electrode active material and a binder, and a roughness Sa1 of a surface of a current collector of the first region and a roughness Sa2 of a surface of a current collector of the second region satisfy: 1?Sa1/Sa2?20. The positive electrode of the present application has a high compacted density and toughness, thereby improving the problem of brittle fracture of the positive electrode and improving the rate capability of a lithium-ion battery.

Abstract: An electrochemical apparatus includes an electrode plate, where the electrode plate includes a current collector, a first layer, and a second layer. The first layer includes a conductive agent, where the conductive agent has a specific surface area (BET) of 60 m2/g to 1500 m2/g. The second layer includes an active material. The first layer is provided between the current collector and the second layer. The conductive agent having a large specific surface area increases the quantity of conductive network paths constructed per unit area, thereby achieving a better conductive connectivity, reducing electronic resistance of the electrode plate, and improving rate performance and cycling performance of the electrochemical apparatus.

Abstract: An electrochemical apparatus includes a packaging bag including a body portion and a sealing portion, an electrode assembly disposed in the body portion, and a conductive plate electrically connected to the electrode assembly. The body portion includes a first end wall and a second end wall disposed opposite to each other in a first direction, and further includes a first side wall and a second side wall disposed opposite to each other in a third direction. The sealing portion includes a first sealing portion and a first folded edge portion disposed opposite to the first side wall in the third direction. The conductive plate protrudes out of the packaging bag from the first sealing portion. The first sealing portion and the first folded edge portion intersect in a transition zone. The transition zone is folded towards the first end wall at least twice to form a folded corner structure.

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.