Abstract: A battery cell including a first electrode plate and a second electrode plate alternately stacked, where a separator is disposed there between. The first electrode plate includes a first current collector and a first active substance layer. The second electrode plate includes a second current collector and a second active substance layer. The first electrode plate further includes a first recess formed by absence of the first active substance layer on the surface of the first current collector and a first tab disposed in the first recess. The second electrode plate includes a second recess formed by absence of the second active substance layer. In a thickness direction of the battery cell, the first recess and the second recess are arranged opposite to each other. A first insulation layer is disposed on a surface of the first tab, and the second recess is provided with a first insulation holding member.

Abstract: An electrochemical apparatus includes a negative electrode. The negative electrode includes a current collector, a first coating, and a second coating, the second coating is provided on at least one surface of the current collector, and the first coating is provided between the current collector and the second coating and contains inorganic particles with a Mohs hardness of 2 to 7.

Abstract: An electrode assembly includes a number of positive electrode plates, a number of separators, and a number of negative electrode plates. The positive electrode plates, the separators, and the negative electrode plates are stacked sequentially. The positive electrode plate has an extended first tab portion and second tab portion. The first tab portions of the positive electrode plates are stacked and electrically connected to form a main positive electrode tab, and the second tab portions of the positive electrode plates are stacked and electrically connected to form a backup positive electrode tab. The negative electrode plate has an extended third tab portion and fourth tab portion. The third tab portions of the negative electrode plates are stacked and electrically connected to form a main negative electrode tab, and the fourth tab portions of the negative electrode plates are stacked and electrically connected to form a backup negative electrode tab.

Abstract: An electrochemical apparatus, including a positive electrode plate and a negative electrode plate; where the negative electrode plate includes a negative electrode active material layer, and the negative electrode active material layer includes a negative electrode active material; and the positive electrode plate includes a positive electrode active material layer, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material includes a lithium manganese oxide; and when the electrochemical apparatus is at a 15% SOC, a lattice parameter a of the lithium manganese oxide is lower than or equal to 8.2008 ?. The electrochemical apparatus has good high-temperature storage performance and cycling performance.

Abstract: A separator includes a substrate and a first coating layer provided on at least one surface of the substrate. The first coating layer includes a first polymer. The number of particles with a maximum length of 10 ?m to 30 ?m in the first polymer in any area of 250 ?m*200 ?m on a surface of the first coating layer is 10 to 30. The separator provided by this application has good interface adhesion performance and improves the structural stability of the lithium-ion battery, so that the lithium-ion battery has better charge and discharge performance, especially rate performance and cycle performance under low temperature.

Abstract: An electrochemical device includes a cathode, a separator and an anode. The cathode includes a cathode current collector, a first cathode active material layer including a first cathode active material, a second cathode active material layer including a second cathode active material, and an insulating layer. The first cathode active material layer is disposed between the cathode current collector and the second cathode active material layer, and the first cathode active material layer is disposed on a first region of a surface of the cathode current collector facing an anode active material layer of the anode, and the thickness of the first cathode active material layer is greater than Dv50 of the first cathode active material. The insulating layer is disposed on a second region of the surface of the cathode current collector not facing the anode active material layer of the anode.

Abstract: A lithium-ion battery having desirable safety performance includes a positive plate having a positive film, a negative plate having a negative film, a separator between the positive plate and the negative plate, and electrolyte. The positive film is provided with a first recess and a positive lead is soldered in the first recess. The negative film is provided with a second recess and a negative lead is soldered in the second recess. A first insulating glue layer is formed on an upper surface and below a lower surface of the positive lead. Surface of the positive film corresponding to the second recess is pasted with a second insulating glue layer.

Abstract: A battery cell includes a first electrode plate and a second electrode plate that are alternately stacked. A separator is disposed between the first electrode plate and the second electrode plate. The first electrode plate includes a first current collector and a first active material layer disposed on the first current collector. The first active material layer includes a body portion and an end portion. The end portion is provided with a raised structure and a transition section. The transition section is adjacent to the body portion and the raised structure. In a thickness direction of the battery cell, a distance from a lowest point of a surface of the transition section to a surface of the first current collector is hr, and a thickness of the body portion of the first active material layer is ha, where (ha?hr)/ha?2%.

Abstract: A button battery including a housing assembly, an electrode assembly, a first tab and a second tab. The housing assembly includes a first conductive portion and a second conductive portion insulated from each other. The electrode assembly includes first electrode plates and second electrode plates of opposite polarities. The first tab includes a first connecting portion and a first extension portion. The first connecting portion is connected to each first electrode plate, and the first extension portion assumes a continuously curved shape. One of the first conductive portion or the second conductive portion is connected to the first electrode plate. When the button battery is dropped, the electrode assembly inside the housing assembly is displaced relative to the housing assembly.

Abstract: An electrochemical device, including a cathode, an anode and an electrolyte. The anode includes an anode current collector and an anode active material disposed on the anode current collector, the electrolyte includes fluoroethylene carbonate, and the electrochemical device meets the following relationship: 17.55?K1?K2?1.63K32+11.27K3?20.80, where K1 represents a specific surface area value of the unit mass of the anode active material (in m2/g), and 1.0?K1?2.0; K2 represents a content value of the fluoroethylene carbonate required by per Ah capacity (in g/Ah), and 0.05?K2?0.25; and K3 represents a weight value of the anode active material required by per Ah capacity (in g/Ah).

Abstract: A battery cell includes an electrode assembly and a packaging bag. The electrode assembly includes first electrode plates, second electrode plates and separators. The first electrode plates include two outer electrode plates and at least one inner electrode plate. In the first direction, the two outer electrode plates are disposed on two outermost sides of the electrode assembly respectively, the inner electrode plate is disposed between the two outer electrode plates, and the second electrode plates are disposed between the two outer electrode plates. The packaging bag includes a metal layer, and a relationship between a first strength S1 of the first current collectors in the outer electrode plates and a second strength S2 of the metal layer satisfies: 0.2 ?S1/S2?0.5.

Abstract: A first sidewall of a housing includes a first wall face and a second wall face. The first sidewall includes a penetrative mounting hole. An insulation assembly is snugly connected to the first wall face or the second wall face. A first insulator includes a penetrative first through-hole. The first through-hole communicates with the mounting hole. An electrode post is disposed in the mounting hole and the first through-hole. When a temperature in an accommodation cavity rises to a first threshold, the first insulator is melted and generates, under an action of a gas pressure in the accommodation cavity of the housing, a pressure relief channel that communicates the accommodation cavity to the outside of the housing. The insulation assembly serves functions of both insulation and pressure relief, thereby not only reducing the material cost, but also improving the energy density of the electrochemical device.

Abstract: An electrode assembly, including a first electrode plate, a second electrode plate, and a separator. The electrode assembly is formed by winding the first electrode plate, the separator, and the second electrode plate. A first tab formed by a plurality of first tab units and a second tab formed by a plurality of second tab units are disposed on the first electrode plate, and a third tab formed by a plurality of third tab units is disposed on the second electrode plate. The electrode assembly is provided with a multi-tab structure to achieve purposes of enhancing a current-carrying capacity of the battery and reducing a temperature rise.

Abstract: An electrochemical device, including a cathode, an anode and an electrolyte. The anode includes an anode current collector and an anode active material disposed on the anode current collector, the electrolyte includes fluoroethylene carbonate, and the electrochemical device meets the following relationship: 17.55?K1?K2?1.63K32+11.27K3?20.80, where K1 represents a specific surface area value of the unit mass of the anode active material (in m2/g), and 1.0?K1?2.0; K2 represents a content value of the fluoroethylene carbonate required by per Ah capacity (in g/Ah), and 0.05?K2?0.25; and K3 represents a weight value of the anode active material required by per Ah capacity (in g/Ah).

Abstract: An electrolyte includes a fluorinated cyclic carbonate, a chain carboxylate and a multi-nitrilemulti-nitrile compound having an ether bond. Based on a total weight of the electrolyte, a weight percentage (Cf) of the fluorinated cyclic carbonate is greater than a weight percentage (Cn) of the multi-nitrilemulti-nitrile compound having an ether bond. The electrolyte can control the expansion of the electrochemical device, so that the electrochemical device has excellent cycle, storage and/or floating-charge performance.

Abstract: A flexible battery includes a plurality of electrode assemblies, an electrical connector, elastic insulation members, and a package bag. The electrical connector is electrically connected to two adjacent electrode assemblies. The elastic insulation members are disposed at two end terminals of the electrical connector and have a gap with the electrode assemblies. The package bag is provided with a first dent accommodating the electrode assembly and the elastic insulation member, and a second dent accommodating the electrical connector. In the flexible battery, stress concentration caused by bending after packaging can be effectively reduced, so the package bag and electrical connector of the flexible battery are not prone to fracture, providing effective protection for the electrode assemblies, improving service life of the flexible battery, and ensuring stable performance and safety of the flexible battery.

Abstract: An electrochemical apparatus, includes an electrode assembly having a positive electrode plate; a negative electrode plate including a negative electrode current collector, a second active material having a second active substance, and a first active material layer having a first active substance located between the negative electrode current collector and the second active material layer; and a separator disposed between the positive electrode plate and the negative electrode plate. Compacted density of the first active material layer is greater than compacted density of the second active material layer. Sphericity of the first active substance is smaller than sphericity of the second active substance. The separator includes a porous substrate layer and a first coating layer disposed on at least one surface of the porous substrate layer facing the second active material layer. 20 N/m?Adhesion between the separator and the negative electrode plate?2 N/m.

Abstract: An electrochemical device includes a shell, an electrode post, and an electrode assembly. A through-hole is provided on the shell. The electrode post is disposed on the shell and at least partially accommodated in the through-hole. The electrode post is electrically connected to the electrode assembly. A frangible portion is provided at a position corresponding to the through-hole on the electrode post. The frangible portion is configured to be burst open when a pressure in the shell reaches a threshold, so as to implement communication between inside and outside of the shell to relieve the pressure. Provided on the electrode post, the frangible portion can be broken when the pressure in the electrochemical device reaches the threshold, so as to relieve the pressure in the electrochemical device.

Abstract: An electrochemical device includes a negative electrode and an electrolytic solution. The negative electrode includes a negative current collector and a negative active material layer disposed on at least one surface of the negative current collector. The negative active material layer includes a first region and a second region. A thickness of any position of the first region is less than an average thickness of the second region. The electrolytic solution includes a salt containing a P—O bond, and the salt accounts for a given content. The electrochemical device according to this application achieves excellent cycle performance.

Abstract: Disclosed are a battery cell self-discharge current detection method, apparatus, and device, and a computer storage medium. The method includes: controlling a constant voltage source to start charging a battery cell at a first moment, and acquiring a first rate of change of a target current over time in a first preset duration after the first moment; controlling, in the case where the first rate of change is greater than a first threshold value, a constant current source and the constant voltage source to charge the battery cell; acquiring, in the case of reaching a second moment, a second rate of change of the target current over time in a second preset duration after the second moment, wherein the second moment is a moment when the time for charging the battery cell using the constant current source and the constant voltage source reaches a third preset duration; and determining.