Abstract: Provided are a secondary battery, a battery module, a battery pack and an electric device. The secondary battery includes an electrode assembly and an electrolytic solution configured to infiltrate the electrode assembly, wherein the electrode assembly includes a negative electrode plate, a separation film and a positive electrode plate, and the negative electrode plate includes a negative electrode current collector and a negative electrode material layer located on at least one surface of the negative electrode current collector; and by setting a tortuosity of the negative electrode plate as ?, the ? satisfies Formula I below: ?=0.5(?)????Formula I where, ? is a porosity of the negative electrode material layer, and ? is a Bruggeman index of the negative electrode material layer, and the ? and a conductivity ? of the electrolytic solution satisfy Formula II below: (2?)0.5+6???(2?)0.5+10??Formula II. Therefore, the secondary battery has an excellent fast-charging performance.

Abstract: A back roller includes a roller body and a wear-resistant layer. The roller body has an axis and a roll surface disposed around the axis. The wear-resistant layer covers the roll surface. Vickers hardness (H) of the wear-resistant layer is 800 HV?H?1400 HV. The roll surface is covered by the wear-resistant layer, and the Vickers hardness (H) of the wear-resistant layer is controlled to be between 800 HV and 1400 HV, so that the roll surface is effectively protected, and wear resistance of the roll surface is improved. In this way, the wear-resistant layer is in direct contact with a material during operation, thereby effectively reducing an abrasion loss on the roll surface and extending the service life of the roll surface.

Abstract: The present application relates to the electrochemical field, and in particular, to a positive electrode material, and an electrochemical energy storage apparatus having thereof. The present application provides a positive electrode material, including a substrate. The substrate includes secondary particles containing primary particles. A surface of the substrate is coated with an oxide coating layer. The oxide coating layer comprises a coating element, and the coating element is selected from one or more of Al, Ba, Zn, Ti, Zr, Mg, W, Y, Si, Sn, B, Co, or P. The electrochemical energy storage apparatus comprises the foregoing positive electrode material.

Abstract: In the embodiments of the present application, an electrolyte, a lithium-ion battery comprising the electrolyte, a battery module, a battery pack, and a device are provided. The electrolyte in the embodiments of the present application comprises an organic solvent, an electrolyte lithium salt dissolved in the organic solvent, and an additive comprising a first additive and a second additive. The first additive is selected from one or more of the compounds represented by formula I, and the second additive is selected from one or more of the compounds represented by formula II. After applying the electrolyte of the present application to a lithium-ion battery, the lithium ion battery has a better cycle performance and storage performance at a high temperature, and lower direct-current impedance at a low temperature, such that the lithium ion battery has both a better high-temperature performance and a better low-temperature performance.

Abstract: The present application relates to a harness isolation plate assembly, a battery module, a battery pack and a device. The harness isolation plate assembly includes a plurality of isolation units comprising busbars and insulating films connecting the busbars; and a connecting assembly through which the adjacent isolation units are connected. In the present application, the harness isolation plate assembly includes a plurality of separate isolation units. Upon molding, each isolation unit can be processed independently. Moreover, a size of each isolation unit is small, thus reducing processing difficulty. Furthermore, it is easy to control a location of each busbar, such that locating accuracy of the busbars is improved so as to enhance connecting reliability between the busbars and an electrode lead. Meanwhile, in each isolation unit, the busbars are connected through the insulating films, such that a risk of short circuit for the busbars is low.

Abstract: This application relates to the field of lithium battery technologies, and in particular, to a binder, a separator, and a lithium-ion battery using such separator, where the binder includes a terpolymer formed by copolymerization of a first monomer unit, a second monomer unit, and a third monomer unit that are specified.

Abstract: Embodiments of the present application provide a method and an apparatus for modifying a parameter of a kinematic pair, and a storage medium. The kinematic pair may be included in a first device, and the first device may be configured with control software. The method may include: obtaining a target value of a first parameter, where the first parameter is a motion state parameter of a kinematic pair; obtaining N first kinematic pairs, where the N first kinematic pairs have same values of the first parameter, and N is an integer greater than or equal to 1; setting modeling states of the N first kinematic pairs in the control software to an editable state; and calling the control software to modify the values of the first parameter of the N first kinematic pairs to the target value.

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: A tab bending detection method and apparatus, an electronic device, and a storage medium are provided. The method includes: performing skeleton extraction on a sectional image of multiple layers of tabs to obtain a skeleton image of the multiple layers of tabs; merging damaged connected components in the skeleton image to obtain a merged connected component, where the damaged connected components are connected components on which breaking occurs in a same tab section; calculating a target number of the multiple layers of tabs based on the merged connected component and an undamaged connected component; and detecting, based on the target number and a preset number, whether any tab in the multiple layers of tabs is in a bending state. The damaged connected components are merged to obtain the merged connected component.

Abstract: A battery cell may include an electrode assembly and a buffer pad, where the electrode assembly may include a main body portion and a tab extending from the main body portion, the main body portion may include a first main body region and a second main body region, and the thickness of the first main body region along a first direction (T) may be smaller than the thickness of the second main body region along the first direction (T); and where the buffer pad may include a compressible first side wall, the first side wall may include a first buffer portion and a second buffer portion, the thickness of the first buffer portion along the first direction (T) may be greater than the thickness of the second buffer portion along the first direction, and the buffer pad may be provided on a side face of the main body portion.

Abstract: A battery box assembly includes a thermal management component; a frame fixed to an edge region of the thermal management component; a top cover covering the frame and forming, together with the frame and the thermal management component, a box for accommodating a battery module; a bottom protective plate fixed to the thermal management component in a direction leaving from the battery module and spaced from the thermal management component to form a sealed space; and an airflow pipeline arranged inside the box, where the airflow pipeline communicates with the sealed space on one end and communicates with the outside of the box on the other end. Also provided are a battery and a manufacturing method of the battery box assembly.

Abstract: The present application relates to an adjusting device, a packaging apparatus, and an adjusting method. In the adjusting device, a first adjuster may provide a first adjustment for a structure to be adjusted such that all the structures to be adjusted are disposed at equal intervals along theoretical spacings in a first direction (a), and a second adjuster may adjust a spacing between the structure to be adjusted and a structure to be adjusted adjacent thereto such that the structures to be adjusted may be disposed in alignment with corresponding receptacles, facilitating precise placement of each structure to be adjusted in the corresponding receptacle.

Abstract: Battery cell and a device and a method for manufacturing the same, a battery, and a power consumption device are provided. The battery cell includes: a shell; an end cap patch; an end cap patch; an insulating film, including a main body portion and a flanging portion, wherein the flanging portion is provided between the end cap and the end cap patch; and a first glue layer, comprising a first portion and a second portion which are provided continuously. The first portion is provided around the second portion, and the first portion is provided between the flanging portion and the end cap patch. The first portion bonds the flanging portion and the end cap patch. The second portion is provided between the end cap and the end cap patch, and the second portion bonds the end cap and the end cap patch. The first portion is thinner than the second portion.

Abstract: A constraining apparatus and a constraining device are described. The constraining apparatus includes a base, a positioning assembly, and a cushion assembly. The positioning assembly includes a plurality of positioning members arranged in sequence and located between two end plate assemblies. The cushion assembly is disposed on at least one of two sides of the positioning member that are opposite each other in the first direction. The constraining apparatus includes a first state and a second state, where in the first state, adjacent two of the positioning members abut against each other, such that an accommodating space for accommodating a battery cell is formed between the adjacent two of the positioning members, and the cushion assembly is configured to abut against the battery cell and the positioning members. In the second state, the plurality of positioning members are spaced apart from each other in the first direction.

Abstract: A positive active material comprising active material bulk particles and a coating layer of an oxide containing N element is disclosed, wherein the surface of the active material bulk particle is doped with M element to form a doped layer, and the content of the M element is 400 ppm to 3000 ppm, and the content of the M element gradually decreases from the outer surface of active material bulk particles towards the core direction; wherein the content of the N element in the coating layer is 100 ppm to 2000 ppm; wherein the average content of the N element per unit volume of the coating layer is greater than the average content of the M element per unit volume of the doped layer; wherein the M element and the N element are each independently selected from one or more of Mg, Ca, Ce, Ti, Zr, Al, Zn, and B.

Abstract: A battery cell, a method and system for manufacturing the battery cell, a battery, and a power consuming device are disclosed. The battery cell includes: a shell including an electrode draw-out portion; and an electrode assembly accommodated in the shell. The end of the electrode assembly facing toward the electrode draw-out portion is provided with a first tab, the first tab is wound around a winding axis of the electrode assembly and includes a plurality of turns of tab layers, and at least some of the plurality of turns of tab layers are welded to form a first welded portion. Some of the plurality of turns of tab layers are welded to the electrode draw-out portion to form a second welded portion; and among the tab layers connected to the first welded portion, at least one turn of tab layer is not welded to the electrode draw-out portion.

Abstract: This application provides a battery and an electric device. The battery provided in this application is provided with a blocking member between two adjacent rows of battery cells along the length direction of the battery cell. In the process of assembling the battery cells in the box, the adhesive at the bottom of the battery cell, when spreading under compressing from the gap created by the housing chamfers to the end cover, will be blocked by the blocking member, thus preventing the adhesive from overflowing to the end cover, improving the safety performance of the battery.

Abstract: A method for recovering lithium bis(fluorosulfonyl)imide is provided in the present application. The method of the present application may comprise: mixing a slag from lithium bis(fluorosulfonyl)imide production process with a solvent of carbonate ester, to obtain a mixed material; subjecting the mixed material to solid-liquid separation, to obtain a discharged liquid and a solid slag; monitoring the chromaticity of the discharged liquid and comparing the chromaticity of the discharged liquid with a chromaticity reference; recycling the discharged liquid to the mixed material, if the chromaticity of the discharged liquid is higher than the chromaticity reference; and recycling the discharged liquid to lithium bis(fluorosulfonyl)imide production process, if the chromaticity of the discharged liquid is lower than or equal to the chromaticity reference.

Abstract: An embodiment of this application discloses a method and device for detecting a defect of an electrode assembly, and a computer-readable storage medium. The method may include: determining a first segmented image of an electrode assembly body in an electrode assembly image based on a first preset threshold; determining a second segmented image of a tab in the electrode assembly image based on a second preset threshold, where the second preset threshold is less than the first preset threshold; and determining defect status of the electrode assembly based on the first segmented image and the second segmented image.

Abstract: An anilox roller and a coating apparatus are provided. The anilox roller includes a roller body and an annular boss formed on a surface of the roller body. The annular boss extends in a circumferential direction of the roller body. The annular boss includes a circumferential surface, a first side surface, and a second side surface. The first side surface and the second side surface face each other in an axial direction of the roller body. The circumferential surface connects the first side surface and the second side surface, and the circumferential surface includes an anilox region having an etched anilox. A first blank region without an etched anilox is arranged between the anilox region and the first side surface.