Abstract: A control method may include: controlling a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first leg, and a second leg set to turn on or off, to form in a first period a circuit loop for a charge/discharge module to discharge to a motor and to form in a second period a circuit loop for the charge/discharge module and the motor to charge a first electric vehicle battery group and a second electric vehicle battery group or form in the second period a circuit loop for the motor to charge the first electric vehicle battery group and the second electric vehicle battery group.

Abstract: The invention refers to negative electrode plate, preparation method thereof and electrochemical device. The negative electrode plate comprises: a negative current collector, a negative active material layer, and an inorganic dielectric layer which are provided in a stacked manner; the negative active material layer comprises opposite first surface and second surface, wherein the first surface is disposed away from the negative current collector; the inorganic dielectric layer is disposed on the first surface of the negative active material layer and consists of an inorganic dielectric material. The negative electrode plate provided by the application is useful in an electrochemical device, and can result in an electrochemical device having simultaneously excellent safety performance and cycle performance.

Abstract: A battery cell, a battery, an electrical device, and a device and method for manufacturing a battery cell are described. The battery cell includes a shell, an electrode assembly, and a current collecting member, where the electrode assembly is accommodated in the shell, and the electrode assembly is provided with a tab; the current collecting member includes a first connecting part and a second connecting part which are connected, the first connecting part is used to be welded to the tab, and the second connecting part is used to be welded to the shell; and the first connecting part and the second connecting part are made of different materials, the first connecting part and the tab are made of the same material, and the second connecting part and the shell are made of the same material.

Abstract: The present application relates to a battery pack case and a battery pack. The battery pack case includes: a bottom plate and a side plate connected to the bottom plate, the bottom plate and the side plate surround to form an accommodating portion configured to accommodate a unit cell; a plurality of first insulating strips are provided on a surface of the bottom plate facing the accommodating portion, the plurality of first insulating strips are sequentially spaced along a length direction or a width direction of the bottom plate, and a glue receiving groove is formed between two adjacent first insulating strips.

Abstract: A non-aqueous electrolyte and a secondary battery, a battery module, a battery pack and an electrical device containing the same. The non-aqueous electrolyte includes an electrolyte salt, a non-aqueous solvent, and a first additive, wherein the electrolyte salt includes lithium bis(fluorosulfonyl)imide, lithium tetrafluoroborate, and lithium difluoro(oxalate)borate, and wherein the first additive includes fluoroethylene carbonate, and wherein based on the total mass of the non-aqueous electrolyte, lithium bis(fluorosulfonyl)imide is present in a mass content of A1, lithium tetrafluoroborate is present in a mass content of A2, lithium difluoro(oxalate)borate is present in a mass content of A3, fluoroethylene carbonate is present in a mass content of B1. The secondary battery simultaneously has good cycling performance, storage performance, hot box safety performance and kinetic performance.

Abstract: A battery cell, a battery, a power consuming device, and a method for manufacturing a battery cell are provided. The battery cell includes: a shell; and an electrode assembly arranged in the shell and including a first electrode plate and a second electrode plate having an opposite polarity to the first electrode plate. The first electrode plate is repeatedly folded in a first direction such that the first electrode plate comprises a plurality of first stack sections connected and stacked in sequence, and the second electrode plate is folded once in a second direction such that the second electrode plate comprises two second stack sections connected to each other, the second direction being perpendicular or parallel to the first direction. The second stack sections and the first stack sections are stacked alternately in sequence. A bent portion of the second electrode plate is in contact with an inner wall of the shell.

Abstract: A continuous reaction system for preparing a ferromanganese oxalate precursor may comprise a first dissolution reactor, a second dissolution reactor, a first reactor, a second reactor, a material storage tank, and an ultrasonic reactor; the first dissolution reactor may be configured to accommodate a metal salt solution required for preparing the ferromanganese oxalate precursor, and the second dissolution reactor may be configured to accommodate a precipitant solution required for preparing the ferromanganese oxalate precursor; the first reactor may include a first feed port and a first overflow port, and the first feed port of the first reactor may be interconnected to a first discharge port of the first dissolution reactor and a second discharge port of the second dissolution reactor respectively through two pipelines.

Abstract: A novel positive electrode sheet, a secondary battery, a battery module, a battery pack and an electrical apparatus are described. The positive electrode sheet includes a positive electrode current collector and a positive electrode film layer with a single-layer structure or a multi-layer structure. When the positive electrode film layer is a single-layer structure, at least one of the positive electrode film layers comprises a first positive electrode active material and a second positive electrode active material; and/or, when the positive electrode film layer is a multi-layer structure, at least one layer of at least one of the positive electrode film layers comprises a first positive electrode active material and a second positive electrode active materials. The first positive electrode active material includes an inner core, a first cladding layer comprising crystalline pyrophosphates, a second cladding layer comprising crystalline phosphate, and a third cladding layer.

Abstract: This application provides a positive electrode plate and an electrochemical apparatus and device associated therewith. The positive electrode plate includes a positive electrode current collector, a positive electrode active material layer disposed on at least one surface of the positive electrode current collector, and a safety layer disposed between the positive electrode active material layer and the positive electrode current collector. The safety layer includes a binding substance, a conductive substance, and a special sensitive substance, where the special sensitive substance is at least one product of esterification of polysaccharide in which a degree of esterification of monosaccharide units is 35% to 98%. The electrochemical apparatus prepared by using the positive electrode plate of this application has significantly improved safety and electrical performance (such as cycling performance).

Abstract: This application relates to the battery field, and discloses a battery module and an electric vehicle using the battery module. The battery module includes a battery, a plugging member, and a temperature collection assembly. The battery includes a housing and a cover plate connected to the housing, where the cover plate is provided with a temperature collection hole. The plugging member includes an insertion portion that is installed in the temperature collection hole, and the insertion portion is provided with an accommodating cavity extending into an interior of the housing. The temperature collection assembly includes a temperature collection portion installed inside the accommodating cavity. According to this application, the temperature collection assembly collects a temperature inside the housing via the plugging member in the temperature collection hole. In this way, temperature collection is more accurate, a thermal conductive path is short, and a temperature collection response speed is fast.

Abstract: A battery pack and a vehicle, wherein the battery pack includes a box assembly, a battery unit, a constraint component and an outer cover, the box assembly includes a box body and a fixed beam, the fixed beam is fixed in the box body; the battery unit is arranged in the box body; the constraint component covers the battery unit and is fixed with the fixed beam; and the outer cover is arranged on one side of the constraint component away from the box body to seal an open end of the box body.

Abstract: Provided are a winding device and a winding apparatus. An inner shaft of the winding device is configured to clamp an electrode assembly; and an outer shaft of the winding device is configured to wind the electrode assembly. The winding device includes: a first slider and a first pusher, where the first slider may reciprocate in a first sliding slot in the first pusher in a first direction, and an extension direction of the first sliding slot is inclined from the first direction such that the first pusher drives a first inner shaft to reciprocate in a second direction, the second direction being perpendicular to the first direction; and a second slider and a second pusher, where the second slider may reciprocate in a second sliding slot in the second pusher in a third direction, and an extension direction of the second sliding slot is inclined from the third direction.

Abstract: This application relates to a secondary battery, a battery column, and an apparatus. The secondary battery includes a top cover plate, having an outer surface and an inner surface disposed opposite each other in a thickness direction of the top cover plate and an electrode lead-out hole extending along the thickness direction; a pole, disposed in the electrode lead-out hole, where the pole includes a first metal layer and a second metal layer, and the first metal layer and the second metal layer are stacked along a direction from the inner surface to the outer surface; an insulation member, disposed between the top cover plate and the pole; and a first bonding layer, disposed between the insulation member and the first metal layer, where the insulation member is hermetically connected to the first metal layer through the first bonding layer.

Abstract: A tensioning mechanism includes a housing including an accommodation cavity and configured to be sleeved with a to-be-tensioned material, a tensioning assembly mounted in the accommodation cavity, and a driving assembly mounted on the housing and configured to drive the tensioning assembly to move against the housing, so that at least a part of the tensioning assembly protrudes from or retracts into the housing. The driving assembly includes a handle mounted on an outer side of the housing and configured to manually drive the tensioning assembly to move against the housing.

Abstract: This application provides a permanent-magnet synchronous machine control method and device, and a permanent-magnet synchronous machine control system. The method includes: obtaining a d-axis current id and a q-axis current iq in a permanent-magnet synchronous machine control loop at a current moment; obtaining a fifth-order harmonic current id5th and a seventh-order harmonic current id7th in the d-axis current id in the permanent-magnet synchronous machine control loop at the current moment, and a fifth-order harmonic current iq5th and a seventh-order harmonic current iq7th in the q-axis current iq in the permanent-magnet synchronous machine loop at the current moment; determining a d-axis current idk+1 at a next moment in each switch state; determining a q-axis current iqk+1 at the next moment in each switch state based on the first current idk, the second current iqk, and the second voltage in each switch state; and determining a control policy of the permanent-magnet synchronous machine.

Abstract: The application relates to a battery module, a battery pack and a vehicle. The battery module includes: secondary batteries, in which two or more secondary batteries are arranged side by side in an arrangement direction; a busbar arranged on a top of the secondary batteries and electrically connected to at least two of the secondary batteries; a sampling assembly including a sampling circuit board arranged on the top of the secondary batteries and a sampling leg extending from the sampling circuit board toward the busbar, the sampling leg and the busbar being welded to form a welded zone; a connector, the sampling leg and the busbar being connected by the connector, the connector being located at a side of the welded zone close to the sampling circuit board.

Abstract: This application relates to the field of energy storage technologies, and provides a battery, an apparatus, a preparation method of battery, and a preparation apparatus of battery. The battery includes a first battery cell and a second battery cell. The first battery cell includes a first pressure relief mechanism, the second battery cell includes a second pressure relief mechanism, an energy density of the first battery cell is greater than an energy density of the second battery cell, and an area of the first pressure relief mechanism is greater than an area of the second pressure relief mechanism. The apparatus includes the foregoing battery.

Abstract: The present application relates to the technical field of batteries, and in particular to a current collector, an electrode sheet, an electrode assembly, a battery cell, a battery and an electric apparatus. The current collector includes: a support layer; and a conductive layer on at least one of two opposite sides of the support layer, where when the support layer is heated and shrinks, the conductive layer shrinks with the support layer to form a hole around a heated portion, the conductive layer includes a first conductive layer in contact with the support layer, and the first conductive layer is a granular conductive layer. On this basis, the safety performance can be improved.

Abstract: A method and apparatus for detecting a defect on a surface of a cell, including: obtaining an initial image of the surface of the cell by using an image acquisition unit; preprocessing the initial image to obtain at least one image to be detected of the surface of the cell; and inputting the at least one image to be detected into a defect detection neural network model, and obtaining a detection result outputted by the defect detection neural network model, the detection result being used to indicate whether there is a defect on the surface of the cell is described. According to technical solutions, features of the defect in the image may be made prominent, so as to facilitate subsequent detection of the defect detection neural network model; and more features may be extracted from the image, thereby improving the efficiency and accuracy of defect detection.

Abstract: Provided are a terminal protection device and a battery module. The terminal protection device includes a base having a bottom portion and side plates connected to peripheral sides of the bottom portion, the side plates and the bottom portion together form an accommodation cavity, and an input port is in communication with the accommodation cavity; each of the side plates is provided with an input port, through which an output electrode passes; each of the side plates is further provided with a connection port, the connection port is in communication with the accommodation cavity such that an external electric connector can pass through the connection port) and be connected to the output electrode; and a protection plate is provided at the connection port, and the protection plate detachably covers the connection port.