Abstract: This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes an electrode assembly. The electrode assembly includes a positive electrode plate, a negative electrode plate, a separator, an insulation layer, and an adhesive layer. The positive electrode plate, the separator, and the negative electrode plate are stacked and wound, and the electrode assembly has bent regions. At least a portion of the insulation layer and at least a portion of the adhesive layer are disposed in the bent region, and the insulation layer is adhered to the positive electrode plate or the negative electrode plate through the adhesive layer. In a thickness direction of the insulation layer, a projected area of the adhesive layer is smaller than a projected area of the insulation layer.

Abstract: A core-shell polymer comprises a core portion and a shell portion that at least partially covers the core portion. The core portion comprises a structural unit derived from a monomer represented by Formula I, and the shell portion comprises a structural unit derived from a monomer represented by Formula I, a structural unit derived from a monomer represented by Formula II, and a structural unit derived from a monomer represented by Formula III, wherein R1, R2 and R3 are each independently selected from hydrogen, fluorine, chlorine or C1-3 alkyl containing at least one fluorine atom, R4, R5, R6, R7, R8, R9 are each independently selected from hydrogen or substituted or unsubstituted C1-3 alkyl, and Ar is substituted or unsubstituted aryl.

Abstract: A preparation method of a positive electrode slurry includes a first stirring, a second stirring, a third stirring and a fourth stirring. In the first stirring, a positive electrode active material, a conductive agent and a first binder are mixed and stirred to prepare a dry mixture. In the second stirring, a second binder and a solvent are mixed and stirred to prepare an adhesive solution. In the third stirring, the dry mixture and the adhesive solution are mixed and stirred to prepare a primary slurry. In the fourth stirring, a solvent and the primary slurry are mixed and stirred to prepare a positive electrode slurry. The weight average molecular weight of a polymer in the second binder is smaller than the weight average molecular weight of any polymer in the first binder.

Abstract: A BAB-type block copolymer comprises a B-block and an A-block, the B-block contains a structural unit represented by formula I, and the A-block contains one or more of a structural unit represented by formula II and a structural unit represented by formula III, where R1, R2 and R3 are each independently selected from one or more of hydrogen, fluorine, and C1-3 alkyl containing at least one fluorine atom, R4, R5 and R6 are each independently selected from hydrogen and substituted or unsubstituted C1-5 alkyl, and R7 is selected from carboxyl, an ester group, hydroxyl, amido, cyano, and a substituted or unsubstituted aromatic group.

Abstract: A fluoropolymer includes a structural unit derived from a monomer of Formula I, a structural unit derived from an olefin monomer, and a structural unit derived from a monomer of Formula II. A molar content of the structural unit derived from the monomer of Formula I is in a range of 60% to 80% based on a total mole of the structural units in the fluoropolymer, wherein R1, R2 and R3 each are independently selected from hydrogen, fluorine, chlorine, or C1-3 alkyl containing at least one fluorine atom, and R4, R5 and R6 each are independently selected from hydrogen, or substituted or unsubstituted C1-5 alkyl.

Abstract: A preparation method of a positive electrode slurry includes a first stirring, a second stirring, a third stirring and a fourth stirring. In the first stirring, a positive electrode active material and a binder are mixed and stirred to prepare a dry mixture. In the second stirring, a binder and a solvent are mixed and stirred to prepare an adhesive solution. In the third stirring, the dry mixture and the adhesive solution are mixed and stirred to prepare a primary slurry. In the fourth stirring, a positive electrode active material, a conductive agent, a solvent and the primary slurry are mixed and stirred to prepare a positive electrode slurry. The binder used in the first stirring is the same as the binder used in the second stirring.

Abstract: This application discloses a battery cell, a battery, and an electric apparatus. The battery cell includes at least one electrode assembly. The electrode assembly includes a positive electrode plate, a negative electrode plate, a separator, and a porous insulation layer. The positive electrode plate, the separator, and the negative electrode plate are stacked and wound. At least a portion of the porous insulation layer is disposed in a bent region of the electrode assembly, and the porous insulation layer is disposed between the positive electrode plate and the separator or disposed between the negative electrode plate and the separator. Based on the above structure, the service life of the battery cell can correspondingly be prolonged, and the safety of the battery cell can correspondingly be improved.

Abstract: An integrated test device and method for filling karst cave deposition and tunnel intermittent water and mud inrush disasters. The device includes a mixing tank, water tank, water collection tank and plurality of depositing tanks, wherein mixing tank outlet is connected to one end of a pipe, the other end of the pipe extends to one end of the water tank, the plurality of depositing tanks are arranged underwater tank at intervals, the water collection tank is arranged at the water tank's other end, and a detachable baffle is arranged in the water tank and in front of each depositing tank. The deposition and consolidation of filling media and water and mud inrush can be simulated and observed through the setting and cooperation of the plurality of depositing tanks, different working conditions can be simulated by changing the flow rate, sample concentration, particle gradation, depositing height and displacement.

Abstract: A wear state online monitoring method and system based on transfer learning and multi-source information fusion are provided. The method includes: separately collecting data of a friction pair to be monitored in a friction and wear testing state and in an on-ship state; performing feature extraction on the data of the friction pair to be monitored; based on the extracted features, performing feature transferring through transfer learning to obtain successfully transferred features; training a random forest model by using the successfully transferred features, and performing wear state monitoring by using the trained random forest model. The application achieves online monitoring of the wear states of the shafting, gearbox, and wear-prone components in marine and aerospace power plants.

Abstract: This application provides an expansion tape for battery packaging, where the expansion tape includes a substrate, an expansion layer, and a primer layer. The substrate has opposite first surface and second surface. The expansion layer is provided on the first surface of the substrate. The expansion layer includes an organic adhesive and a temperature expansion material. The temperature expansion material is a material capable of volume expansion after heat treatment. The primer layer is provided on the second surface of the substrate. The primer layer has adhesion.

Abstract: Disclosed is an adhesive tape for an electrode tab, which includes a base-material layer and an adhesive layer. The adhesive layer includes a thick region and a thin region which extend from a side edge of the adhesive tape in a width direction of the adhesive layer, the thick region is distributed along the side edge of the adhesive tape, and an adhesive layer thickness of the thick region is greater than an adhesive layer thickness of the thin region. A ratio of an area of the thin region to an area of the thick region is 1:0.02-0.25, optionally 1:0.025-0.18, and further optionally 1:0.0275-0.125. The adhesive tape covers an edge of the tab to fundamentally prevent contact between the tab and a battery cell body.

Abstract: This application provides a binder composition. The binder composition includes a first fluoropolymer and a second fluoropolymer, where the first fluoropolymer includes polyvinylidene fluoride with a weight-average molecular weight of 5000000-9000000, and a weight-average molecular weight of the second fluoropolymer is not greater than 600000. Featuring good processability, this binder composition, even added in small amounts, can provide electrode plates with great adhesion force and improve the cycling performance of a battery.

Abstract: The present application relates to a binder, a binder composition, a preparation method, a negative electrode slurry, a negative electrode plate, a secondary battery, a battery module, a battery pack and an electrical apparatus. The binder here comprises: an inner core material having a glass transition temperature of ?50° C. to 0° C., and a shell layer material located on at least part of the surface of the inner core material and having a glass transition temperature of 60° C. to 100° C.

Abstract: This application provides a binder composition. The binder composition includes a first fluoropolymer and a second fluoropolymer, where the first fluoropolymer includes polyvinylidene fluoride with a weight-average molecular weight of 1,500,000-5,000,000, and a weight-average molecular weight of the second fluoropolymer does not exceed 600,000. The binder composition has good processability, achieves high adhesion force for the electrode plate when added in small amounts, and improves the cycling performance of the battery.

Abstract: A magnetic field fresh-keeping apparatus and an air-cooled refrigeration device. The magnetic field fresh-keeping apparatus comprises a drawer container, a drawer, a magnet assembly, and a waterproof structure. The front side of the drawer container has an opening. The drawer is slidably mounted within the drawer container. The magnet assembly comprises a first magnet and a second magnet disposed on opposite sides of the drawer container. The magnet mounting cavity comprises a first mounting cavity for accommodating the first magnet and a second mounting cavity for accommodating the second magnet, and the first mounting cavity and the second mounting cavity are both configured to allow an airflow to pass through so as to cool the first magnet and the second magnet. The waterproof structure is configured to waterproof the magnet assembly.

Abstract: The present application provides a negative electrode plate, comprising a current collector and a negative electrode film layer, wherein the negative electrode film layer comprises a negative electrode active material, a copolymer formed by acrylonitrile and acrylic acid components, and a polyol. Optionally, the negative electrode film layer further comprises a polyether. The cross-linked polymer and polyether described in the present application can reduce the rebound rate of the negative electrode plate during cycling, thereby improving the capacity retention rate of the battery.

Abstract: An embodiment of the present application provide an electrode assembly, a battery cell, a battery, and an electrode assembly manufacturing equipment and method. Among that, the electrode assembly includes a negative electrode plate and a positive electrode plate which form a bending region. The positive electrode plate includes bending portions located in the bending region, the bending portion includes a positive electrode current collecting layer and a positive active substance layer, and at least one side surface of the positive electrode current collecting layer is provided with the positive active substance layer in a thickness direction of the positive electrode plate. At least one positive active substance layer is provided with the barrier layer, at least a part of the barrier layer is intercalated in the positive active substance layer provided with the barrier layer, and coats at least a part of particles in the positive active substance layer.

Abstract: Provided is a positive electrode slurry, a secondary battery, a battery module, a battery pack and a power consuming device. The positive electrode slurry comprises a positive electrode active substance, a conductive agent and a binder, wherein the binder comprises a polymer A, and the polymer A comprises a structural unit derived from a monomer containing a cyano group, a structural unit derived from a monomer containing an amide group, and a structure unit derived from a monomer containing an ester group. In the present invention, the polymer A is used as the binder of the positive electrode slurry, such that the stability and processability of the positive electrode slurry are improved, and the adhesive force of the positive electrode plate is increased.

Abstract: The present application provides a binder, a preparation method therefor, a secondary battery, a battery module, a battery pack, and a power consuming device. The binder comprises a polymer comprising structural units derived from a monomer represented by formula I and structural units derived from a monomer represented by formula II, wherein R1 and R2 are each independently selected from hydrogen or substituted or unsubstituted C1-5 alkyl, R3 is selected from hydrogen or methyl, and R4 is selected from substituted or unsubstituted C1-9 alkyl. The binder can be coated on the surface of the positive electrode active material, which is beneficial to maintain the structural integrity of the positive electrode active material during the cycling of the positive electrode plate, thereby improving the cycling performance of the battery.

Abstract: The present application provides a binder, including a polyvinylidene fluoride having a weight average molar mass of 1.5 million to 5.0 million; optionally, the polyvinylidene fluoride has a weight average molar mass of 1.8 million to 3.2 million.