Powder mixing equipment and battery production line

Abstract

The embodiment of the utility model provides powder mixing equipment and a battery production line. The powder mixing equipment comprises a barrel and a stirring mechanism, the barrel is provided with an inner wall surface, and at least part of the stirring mechanism is located in the barrel; wherein the inner wall surface comprises a first area close to the stirring mechanism and a second area far away from the stirring mechanism, the first area is provided with a ceramic layer, and the second area is provided with a tungsten carbide layer. According to the technical scheme, the heat conduction efficiency of the barrel can be considered, and meanwhile the performance of the barrel is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a powder mixing device and a battery production line. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] At present, during the mixing process of the positive electrode material of secondary batteries in powder mixing equipment, the coating of the cylinder near the blades is easily worn, affecting the production of batteries. Utility Model Content

[0004] The present application provides a powder mixing device and a battery production line, which can improve the performance while taking into account the thermal conductivity efficiency of the cylinder.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, an embodiment of the present application provides a powder mixing device, which includes a cylinder and a stirring mechanism, the cylinder having an inner wall surface, and the stirring mechanism is at least partially located inside the cylinder; wherein the inner wall surface includes a first area close to the stirring mechanism and a second area away from the stirring mechanism, the first area is provided with a ceramic layer, and the second area is provided with a tungsten carbide layer.

[0007] In the technical solution of the embodiment of the present application, when the powder mixing equipment is stirring the material, for example, when the material is the positive electrode material of a secondary battery, a ceramic layer is provided on the first area of ​​the inner wall surface of the cylinder close to the stirring mechanism. The wear resistance of the ceramic layer is better than that of the tungsten carbide layer, thereby improving the wear resistance of the inner wall surface of the cylinder in the area close to the stirring mechanism, correspondingly reducing the risk of metal magnetic particles being introduced into the positive electrode material, and reducing the probability of the positive electrode material of the secondary battery being contaminated. In the second area away from the stirring mechanism, a tungsten carbide layer is provided. The thermal conductivity efficiency of the tungsten carbide layer is better than that of the ceramic layer. That is, the ceramic layer and the tungsten carbide layer are respectively provided on the inner wall surface of the cylinder in the corresponding areas, which has little effect on the thermal conductivity efficiency of the cylinder. This achieves the goal of improving the wear resistance of the cylinder while taking into account the thermal conductivity efficiency of the cylinder, allowing the powder mixing equipment to operate safely and continuously and achieving efficient mixing of materials.

[0008] According to some embodiments of the present application, the ceramic layer includes a plurality of ceramic sheets, and the plurality of ceramic sheets are spliced ​​together to form the ceramic layer.

[0009] In this solution, multiple ceramic sheets are joined together to form a ceramic layer. Compared to a single large-sized ceramic sheet, each ceramic sheet has a smaller area, making it easier to apply to different parts of the cylinder's inner wall, and the ceramic sheets have a higher degree of adhesion. Furthermore, when individual ceramic sheets in a ceramic layer need to be replaced, only the corresponding ceramic sheet needs to be replaced, without replacing the entire ceramic layer, which reduces maintenance costs.

[0010] According to some embodiments of the present application, the ceramic sheet is attached to the first area by an adhesive.

[0011] In the above solution, the ceramic sheet is attached to the first area of ​​the cylinder by means of an adhesive, the ceramic layer attachment process is simple, and the fixing effect of the ceramic sheet is good.

[0012] According to some embodiments of the present application, there is a gap between two adjacent ceramic sheets, and the gap is filled with an adhesive.

[0013] In the above solution, by filling the gap between two adjacent ceramic sheets with a binder, on the one hand, the binder can further bond and fix the two adjacent ceramic sheets, thereby making the ceramic sheets in the ceramic layer become a whole, improving the bonding stability of the ceramic layer on the cylinder, extending the service life of the ceramic layer, and reducing the risk of ceramic sheets falling off. On the other hand, the binder can fill the gap between the two ceramic sheets, reducing the risk of contact between the mixed material in the cylinder and the cylinder.

[0014] According to some embodiments of the present application, the shape of the ceramic sheet is square, rectangular, diamond or hexagonal.

[0015] In the above scheme, the shape of the ceramic sheet is square, rectangular, diamond or hexagonal. When the ceramic sheet is pasted, the ceramic sheet of the corresponding shape can be selected according to the actual pasting requirements of the ceramic layer. The pasting flexibility is better and can meet the pasting requirements of different positions on the inner wall of the cylinder.

[0016] According to some embodiments of the present application, the material of the ceramic layer is aluminum oxide ceramic, silicon nitride ceramic, beryllium oxide ceramic or zirconium oxide ceramic.

[0017] In the above scheme, the material of the ceramic layer is selected as alumina ceramic, silicon nitride ceramic, beryllium oxide ceramic or zirconia ceramic. The above ceramics have good wear resistance and high thermal conductivity, which can meet the thermal efficiency requirements of the cylinder as much as possible and reduce the impact on the thermal efficiency of the cylinder.

[0018] According to some embodiments of the present application, the thickness of the ceramic layer is greater than the thickness of the tungsten carbide layer, and the side of the ceramic layer close to the tungsten carbide layer smoothly transitions to the tungsten carbide layer.

[0019] In the above solution, by smoothly transitioning the adjacent positions of the ceramic layer and the tungsten carbide layer, the smoothness of the inner wall surface of the cylinder is improved and the risk of material jamming on the inner wall surface of the cylinder is reduced.

[0020] According to some embodiments of the present application, along the radial direction of the cylinder, the projection of the stirring mechanism falls within the projection of the ceramic layer, and the projection of the stirring mechanism does not overlap with the projection of the tungsten carbide layer.

[0021] In the above scheme, a ceramic layer is attached to the inner wall surface of the cylinder near the stirring area of ​​the stirring mechanism, that is, a ceramic layer is attached to the inner wall surface of the cylinder in the wear-prone area, which can more specifically improve the wear resistance of the cylinder and extend the service life of the equipment.

[0022] According to some embodiments of the present application, the cylinder includes a bottom wall, a peripheral wall and a top wall, the stirring mechanism includes a stirring shaft and a stirring blade, the stirring shaft is rotatably arranged on the bottom wall, and the stirring blade is arranged on the stirring shaft and is located above the bottom wall; the ceramic layer is arranged on the inner wall surface of the bottom wall and a part of the inner wall surface of the peripheral wall, and the tungsten carbide layer is arranged on the inner wall surface of the top wall and another part of the inner wall surface of the peripheral wall.

[0023] In the above solution, the stirring mechanism is located at the bottom of the cylinder, and the stirring blades stir the material above the bottom wall of the cylinder, making the coating on the bottom wall and peripheral wall near the stirring blades susceptible to wear. Therefore, by applying a ceramic layer to a portion of the inner surface of the bottom wall and peripheral wall, the cylinder can be targeted to the area where the stirring blades are located to provide wear resistance. The tungsten carbide layer is applied to the area above the stirring blades within the cylinder, ensuring wear resistance while also ensuring good thermal conductivity of the cylinder.

[0024] According to some embodiments of the present application, the powder mixing equipment further includes a cooling jacket and a thermal insulation layer. The cooling jacket is arranged on the outside of the cylinder, and the thermal insulation layer is arranged on the outside of the cooling jacket.

[0025] In the above solution, the cooling jacket is placed outside the cylinder. This enhances the heat transfer efficiency of the materials within the cylinder, allowing the heat generated by the mixing of the materials inside the cylinder to be quickly transferred through the cylinder to the coolant within the cooling jacket. The coolant in the cooling jacket exchanges heat with the heat transferred by the cylinder, thereby reducing the mixing temperature of the materials inside the cylinder. The insulation layer is placed outside the cooling jacket to provide insulation and reduce the risk of external heat exchange.

[0026] In a second aspect, an embodiment of the present application further provides a battery production line, which includes the powder mixing equipment of the above embodiment, and the powder mixing equipment is used to mix the positive electrode material or the negative electrode material of the battery.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A schematic structural diagram of a vehicle according to some embodiments of the present application;

[0030] Figure 2 Schematic diagram of the exploded structure of batteries according to some embodiments of the present application;

[0031] Figure 3 This is a schematic structural diagram of a powder mixing device according to some embodiments of the present application;

[0032] Figure 4 for Figure 3 Front sectional view of section AA;

[0033] Figure 5 for Figure 4 A is an enlarged schematic diagram.

[0034] Icons: 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-housing; 11-first part; 12-second part; 20-battery cell; 400-powder mixing equipment; 410-cylinder; 411-inner wall; 412-first area; 413-second area; 414-bottom wall; 415-peripheral wall; 420-stirring mechanism; 421-stirring shaft; 422-upper blade; 423-lower blade; 430-ceramic layer; 440-tungsten carbide layer; 450-cooling jacket; 460-insulation layer. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0037] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0040] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0041] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0042] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0043] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0044] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0045] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0046] The battery cells may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0047] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of another shape, wherein the prismatic battery cell includes a square-cased battery cell.

[0048] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0049] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0050] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0051] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a surface silver plating treatment, stainless steel with a surface silver plating treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0052] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0053] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0054] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0055] In some embodiments, the negative electrode current collector has two opposite surfaces in its thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0056] As an example, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0057] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0058] The increasing number of new energy electric vehicles has also brought with it some battery production issues. During the mixing process of powder mixing equipment for secondary battery cathode materials, the extremely high speed of the paddles during operation makes the tungsten carbide layer on the cylinder near the paddles extremely susceptible to wear during large-scale, long-term continuous production. This wear can easily lead to direct contact between the material and the stainless steel cylinder, introducing metallic magnetic particles, which significantly affects the quality and production capacity of the battery products.

[0059] Based on the above considerations, in order to improve the performance of the mixing equipment while taking into account the thermal conductivity efficiency of the cylinder, the present application designs a powder mixing equipment, which includes a cylinder and a stirring mechanism. The cylinder has an inner wall surface, and a ceramic layer is provided in the first area of ​​the inner wall surface close to the stirring mechanism, and a tungsten carbide layer is provided in the second area away from the stirring mechanism.

[0060] In such powder mixing equipment, when the stirring mechanism is used to stir the positive electrode material for a secondary battery, the ceramic layer exhibits superior wear resistance compared to the tungsten carbide layer. The ceramic layer is positioned on the inner wall of the cylinder near the stirring mechanism, improving the wear resistance of the cylinder in this area. This, in turn, reduces the risk of metallic magnetic particles being introduced into the positive electrode material, thereby reducing the probability of contamination of the secondary battery's positive electrode material. A tungsten carbide layer is positioned in a second area, further away from the stirring mechanism. This layer offers better thermal conductivity than the ceramic layer, improving the cylinder's wear resistance while maintaining its thermal efficiency.

[0061] The battery disclosed in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power supply system of the electrical equipment can be composed of the battery cells and batteries disclosed in the present application.

[0062] The embodiments of the present application provide an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0063] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0064] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, to meet the power requirements for starting, navigating and driving the vehicle 1000.

[0065] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0066] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and can have various structures. In some embodiments of the present application, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0067] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 20 may be housed within the housing 10. Alternatively, the battery 100 may be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, which is then connected in series, in parallel, or in a hybrid connection to form a complete battery module, and then housed within the housing 10. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0068] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery.

[0069] The battery cell 20 is the smallest unit of the battery and includes an end cap, a housing, an electrode assembly, and other functional components.

[0070] The end cap refers to a component that covers the opening of the shell to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap can be adapted to the shape of the shell to match the shell. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is not easily deformed when squeezed or collided, so that the battery cell can have a higher structural strength and the reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap. The electrode terminal can be used to electrically connect to the electrode assembly for outputting or inputting electrical energy of the battery cell 20. The material of the end cap can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose special restrictions on this. In some embodiments of the present application, an insulating structure can also be provided on the inner side of the end cap, and the insulating structure can be used to isolate the electrical connection components in the shell from the end cap to reduce the risk of short circuit. Exemplary, the insulating structure can be plastic, rubber, etc.

[0071] The electrode assembly is a component in the battery cell 20 where the electrochemical reaction occurs. One or more electrode assemblies may be contained in the shell. The electrode assembly is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a diaphragm is usually provided between the positive electrode sheet and the negative electrode sheet. The diaphragm is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body.

[0072] This application embodiment provides a powder mixing device, please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 This is a schematic structural diagram of a powder mixing device according to some embodiments of the present application; Figure 4 for Figure 3 Front sectional view of section AA; Figure 5 for Figure 4 An enlarged schematic diagram of Figure A in Figure 4 is provided. The powder mixing apparatus 400 includes a barrel 410 and a stirring mechanism 420. The barrel 410 has an inner wall 411, and the stirring mechanism 420 is at least partially located within the barrel 410. The inner wall 411 includes a first region 412 proximal to the stirring mechanism 420 and a second region 413 distal to the stirring mechanism 420. The first region 412 is provided with a ceramic layer 430, and the second region 413 is provided with a tungsten carbide layer 440.

[0073] The cylinder 410 is a container, and the internal space of the cylinder 410 is used to accommodate the materials to be mixed. The inner wall surface 411 of the cylinder 410 refers to the inner surface of one side of the thickness direction of the cylinder 410. The stirring mechanism 420 is at least partially located in the cylinder 410, and the part of the stirring mechanism 420 located in the cylinder 410 can stir the materials in the cylinder 410. Figure 4 and Figure 5 The first region 412 refers to a region where the inner wall surface 411 of the cylinder 410 is close to the stirring mechanism 420 , and the second region 413 refers to a region where the inner wall surface 411 of the cylinder 410 is far from the stirring mechanism 420 .

[0074] Understandably, when the stirring mechanism 420 drives the material within the barrel 410 to rotate, the friction frequency between the inner wall 411 of the barrel 410 and the material is higher in the area near the stirring mechanism 420. Therefore, the coating on the inner wall 411 of the barrel 410 near the stirring mechanism 420 is more susceptible to wear. In addition, the high-speed paddles in the stirring mechanism 420 and the dry-mixed materials easily generate heat during the mixing process. Since the positive electrode material of the secondary battery has high temperature requirements, the thermal conductivity of the coating on the inner wall 411 of the barrel 410 is also relatively important.

[0075] The powder mixing equipment 400 can be used for a variety of materials. For example, the material can be the positive electrode material of a secondary battery. Of course, the material is not limited to the positive electrode material powder material of a secondary battery, but is also applicable to the mixing field of the negative electrode material powder material of a secondary battery, food, medicine and other ultrafine powder materials.

[0076] In the technical solution of the embodiment of the present application, when the powder mixing equipment 400 stirs the material, for example, when the material is the positive electrode material of a secondary battery, a ceramic layer 430 is provided on the inner wall surface 411 of the cylinder 410 in the first area 412 close to the stirring mechanism 420. The wear resistance of the ceramic layer 430 is better than that of the tungsten carbide layer 440, which improves the wear resistance of the inner wall surface 411 of the cylinder 410 in the area close to the stirring mechanism 420, and correspondingly reduces the risk of metal magnetic particles being introduced into the positive electrode material, thereby reducing the probability of contamination of the positive electrode material of the secondary battery. A tungsten carbide layer 440 is provided in the second area 413 away from the stirring mechanism 420. The thermal conductivity efficiency of the tungsten carbide layer 440 is better than that of the ceramic layer 430. That is, the ceramic layer 430 and the tungsten carbide layer 440 are respectively provided in the corresponding areas of the inner wall surface 411 of the cylinder 410, which has little effect on the thermal conductivity efficiency of the cylinder 410. It is achieved that the thermal conductivity efficiency of the cylinder 410 is taken into account while improving its wear resistance, so that the powder mixing equipment 400 can operate safely and continuously and realize efficient mixing of materials.

[0077] According to some embodiments of the present application, the ceramic layer 430 includes a plurality of ceramic sheets, and the plurality of ceramic sheets are spliced ​​together to form the ceramic layer 430 .

[0078] The ceramic layer 430 is formed by sequentially splicing a plurality of ceramic sheets along the first region 412 of the inner wall surface 411 of the cylinder 410 .

[0079] Multiple ceramic sheets are joined together to form ceramic layer 430. Compared to a single large ceramic sheet, each sheet has a smaller area, making it easier to apply to different parts of the inner wall 411 of the cylinder 410, and the sheets adhere more closely. Furthermore, when individual ceramic sheets in ceramic layer 430 need to be replaced, only the corresponding sheet needs to be replaced, without replacing the entire ceramic layer 430, resulting in lower maintenance costs.

[0080] According to some embodiments of the present application, the ceramic sheet is attached to the first area 412 by an adhesive.

[0081] An adhesive is applied to the side of the ceramic sheet closest to the inner wall surface 411, and the ceramic sheet is attached to the first region 412 via the adhesive. The adhesive can be AB glue (a two-liquid mixed hardening adhesive), and the adhesive ingredients include one or more of epoxy resin glue, polyurethane glue, and acrylic resin. The thermal conductivity of the adhesive is extremely low, ranging from 0.02 to 0.4 W / (m·K).

[0082] To improve the thermal conductivity of the adhesive, add highly conductive inorganic carbon. This includes one or more of conductive carbon, natural graphite, artificial graphite, and carbon nanotubes. Add 0.1-0.5% of the total adhesive to the diluent in Agent A or Agent B (one of the two is the diluent, the other is the curing agent), mix thoroughly, and then blend according to the adhesive ratio.

[0083] The thickness of the adhesive is between 0.8 and 2 mm, and the specific thickness of the adhesive can be determined according to the thickness of the ceramic sheet. When the ceramic sheet is thicker, the adhesive thickness should be relatively thick to ensure the bonding stability of the ceramic sheet. Conversely, when the ceramic sheet is thinner, the adhesive thickness should be relatively thin.

[0084] The ceramic sheet is attached to the first area 412 of the cylinder 410 by an adhesive. The attaching process of the ceramic layer 430 is simple, and the fixing effect of the ceramic sheet is good.

[0085] According to some embodiments of the present application, there is a gap between two adjacent ceramic sheets, and the gap is filled with an adhesive. The gap refers to the distance between two adjacent ceramic sheets. The gap between two adjacent ceramic sheets can be 0.05 to 0.2 mm, and the size of the gap can be determined according to the splicing position of the ceramic sheets. After the ceramic sheets are bonded, the surface of the ceramic layer 430 is polished to a smooth surface to prevent the gap from causing material to get stuck.

[0086] By filling the gap between two adjacent ceramic sheets with a binder, the binder can further bond and secure the two adjacent ceramic sheets, thereby integrating the individual ceramic sheets in ceramic layer 430 into a single unit. This improves the bonding stability of ceramic layer 430 on cylinder 410, extends the service life of ceramic layer 430, and reduces the risk of ceramic sheets falling off. Furthermore, the binder can fill the gap between the two ceramic sheets, reducing the risk of contact between the mixed material within cylinder 410 and cylinder 410.

[0087] According to some embodiments of the present application, the shape of the ceramic sheet is square, rectangular, rhombus, or hexagonal. When the ceramic sheet is shaped like a square, rectangular, rhombus, or hexagon, the ceramic sheet can be selected according to the actual placement requirements of the ceramic layer 430 during placement, which provides greater placement flexibility and can meet the placement requirements of different locations on the inner wall of the cylinder 410.

[0088] According to some embodiments of the present application, the material of the ceramic layer 430 is aluminum oxide ceramic, silicon nitride ceramic, beryllium oxide ceramic or zirconium oxide ceramic.

[0089] Alumina ceramics are a type of ceramic material with aluminum oxide (Al2O3) as the main component. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance.

[0090] Silicon nitride ceramics are an inorganic material that does not shrink during sintering. Silicon nitride is very strong, especially hot-pressed silicon nitride, which is one of the hardest substances in the world. It has high strength, low density, and high temperature resistance.

[0091] Beryllium oxide ceramics are ceramics with beryllium oxide as the main component. Zirconia ceramics, ZrO2 ceramics, Zirconia Ceramic have excellent properties such as high melting and boiling points, high hardness, being an insulator at room temperature, and being conductive at high temperatures.

[0092] The material of the ceramic layer 430 is selected as alumina ceramic, silicon nitride ceramic, beryllium oxide ceramic or zirconium oxide ceramic. The above ceramics have good wear resistance and high thermal conductivity, which can meet the thermal efficiency requirements of the cylinder 410 as much as possible and reduce the impact on the thermal efficiency of the cylinder 410.

[0093] According to some embodiments of this application, please refer to Figure 5 , Figure 5 for Figure 4 The enlarged schematic diagram of A in the middle is shown. The thickness of the ceramic layer 430 is greater than that of the tungsten carbide layer 440 , and the ceramic layer 430 is close to the tungsten carbide layer 440 and smoothly transitions to the tungsten carbide layer 440 .

[0094] The thickness of the ceramic sheet in the ceramic layer 430 is 3-5 mm. The thickness of the tungsten carbide layer 440 is 0.2-0.4 mm. In this embodiment, the thickness of the tungsten carbide layer 440 is 0.3 mm.

[0095] By smoothly transitioning the adjacent positions of the ceramic layer 430 and the tungsten carbide layer 440 , the smoothness of the inner wall surface 411 of the cylinder 410 is improved, and the risk of material jamming on the inner wall surface 411 of the cylinder 410 is reduced.

[0096] According to some embodiments of the present application, along the radial direction Y of the cylinder 410 , the projection of the stirring mechanism 420 falls within the projection of the ceramic layer 430 , and the projection of the stirring mechanism 420 does not overlap with the projection of the tungsten carbide layer 440 .

[0097] The radial direction Y of the cylinder 410 refers to a straight line direction along a diameter or radius, or a straight line direction perpendicular to the axial direction X.

[0098] The inner wall surface 411 of the cylinder 410 is provided with a ceramic layer 430 near the stirring area of ​​the stirring mechanism 420, that is, the inner wall surface 411 of the cylinder 410 is provided with a ceramic layer 430 in the wear-prone area, which can more specifically improve the wear resistance of the cylinder 410 and extend the service life of the equipment.

[0099] According to some embodiments of this application, please refer to Figure 4 The cylinder 410 includes a bottom wall 414, a peripheral wall 415 and a top wall. The stirring mechanism 420 includes a stirring shaft 421 and a stirring blade. The stirring shaft 421 is rotatably arranged on the bottom wall 414, and the stirring blade is arranged on the stirring shaft 421 and is located above the bottom wall 414; the ceramic layer 430 is arranged on the inner wall surface 411 of the bottom wall 414 and a part of the inner wall surface 411 of the peripheral wall 415, and the tungsten carbide layer 440 is arranged on the inner wall surface 411 of the top wall and another part of the inner wall surface 411 of the peripheral wall 415.

[0100] The shape of the cylinder 410 can be a cylindrical structure, and the material of the cylinder 410 can be a glass fiber reinforced plastic plate or a stainless steel plate. In this embodiment, the material of the cylinder 410 is 304 stainless steel. Figure 4 The stirring blades are arranged on the stirring shaft 421, and the stirring blades include an upper blade 422 and a lower blade 423. The upper blade 422 and the lower blade 423 are spaced apart along the axial direction X of the stirring shaft 421, and the upper blade 422 is located above the lower blade 423. The outer surfaces of the upper blade 422 and the lower blade 423 are sprayed with a tungsten carbide layer 440. A driving member (not shown in the figure) is connected to the end of the stirring shaft 421 away from the stirring blades. The driving member drives the rotating shaft of the stirring shaft 421, thereby driving the stirring blades to mix and stir the materials in the cylinder 410.

[0101] A stirring mechanism 420 is disposed at the bottom of the barrel 410. The stirring blades stir the material above the bottom wall 414 of the barrel 410, causing the coating on the bottom wall 414 and the peripheral wall 415 of the barrel 410 near the stirring blades to wear easily. Therefore, by disposing a ceramic layer 430 on a portion of the inner wall surface 411 of the bottom wall 414 and the peripheral wall 415, the barrel 410 in the area where the stirring blades are located can be targeted for wear resistance. Furthermore, a tungsten carbide layer 440 is disposed in the area above the stirring blades within the barrel 410, ensuring wear resistance while also ensuring good thermal conductivity for the barrel 410.

[0102] According to some embodiments of this application, please continue to refer to Figure 4 The powder mixing equipment 400 further includes a cooling jacket 450 and a heat-insulating layer 460 . The cooling jacket 450 is disposed on the outside of the cylinder 410 , and the heat-insulating layer 460 is disposed on the outside of the cooling jacket 450 .

[0103] The cooling jacket 450 is a hollow structure and is mounted on the outside of the cylinder 410. Coolant flows inside the cooling jacket 450, exchanging heat with the cylinder 410, quickly removing heat generated by the stirring of the material inside the cylinder 410, and achieving temperature control of the material inside the cylinder 410.

[0104] Cooling jacket 450 is disposed outside barrel 410. It enhances the heat transfer efficiency of the materials within barrel 410, allowing the heat generated by the mixing of the materials within barrel 410 to be quickly transferred through barrel 410 to the coolant within cooling jacket 450. The coolant within cooling jacket 450 then exchanges heat with the heat transferred from barrel 410, thereby reducing the mixing temperature of the materials within barrel 410. Insulation layer 460 is disposed outside cooling jacket 450 to provide insulation and reduce the risk of external heat exchange.

[0105] An embodiment of the present application further provides a battery production line, which includes the powder mixing device 400 of the above embodiment, and the powder mixing device 400 is used to mix the positive electrode material or the negative electrode material of the battery.

[0106] According to some embodiments of this application, please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 3 This is a schematic structural diagram of a powder mixing device according to some embodiments of the present application; Figure 4 for Figure 3 Front sectional view of section AA; Figure 5 for Figure 4An enlarged schematic diagram of A in the figure. The powder mixing equipment 400 includes a barrel 410, a cooling jacket 450, an insulating layer 460, and a stirring mechanism 420. The cooling jacket 450 is arranged on the outside of the barrel 410, and the insulating layer 460 is arranged on the outside of the cooling jacket 450. The barrel 410 has an inner wall surface 411, and the stirring mechanism 420 is at least partially located inside the barrel 410; the inner wall surface 411 includes a first area 412 close to the stirring mechanism 420 and a second area 413 away from the stirring mechanism 420. The first area 412 is provided with a ceramic layer 430, and the second area 413 is provided with a tungsten carbide layer 440. The ceramic layer 430 includes a plurality of ceramic sheets, which are spliced ​​together to form the ceramic layer 430. The ceramic sheets are attached to the first area 412 by an adhesive. There is a gap between two adjacent ceramic sheets, and the gap is filled with an adhesive.

[0107] By providing a ceramic layer 430 on the inner wall surface 411 of the cylinder 410 in the first region 412 near the stirring mechanism 420, the wear resistance of the ceramic layer 430 is better than that of the tungsten carbide layer 440, thereby improving the wear resistance of the inner wall surface 411 of the cylinder 410 in the region near the stirring mechanism 420, thereby correspondingly reducing the risk of metal magnetic particles being introduced into the positive electrode material and reducing the probability of contamination of the positive electrode material of the secondary battery. In the second region 413 away from the stirring mechanism 420, a tungsten carbide layer 440 is provided. The thermal conductivity of the tungsten carbide layer 440 is better than that of the ceramic layer 430, thereby achieving both the thermal conductivity of the cylinder 410 and the wear resistance, allowing the powder mixing equipment 400 to operate safely and continuously and achieve efficient mixing of materials. The ceramic sheet is attached to the first region 412 of the cylinder 410 by an adhesive. The attachment process of the ceramic layer 430 is simple, and the fixing effect of the ceramic sheet is good.

[0108] The gap between two adjacent ceramic sheets is filled with a binder. On the one hand, the binder further bonds and secures the two adjacent ceramic sheets, thereby integrating the individual ceramic sheets in ceramic layer 430 into a single unit. This improves the bonding stability of ceramic layer 430 on cylinder 410, extends the service life of ceramic layer 430, and reduces the risk of ceramic sheets falling off. On the other hand, the binder fills the gap between the two ceramic sheets, reducing the risk of contact between the mixed material within cylinder 410 and cylinder 410.

[0109] According to some embodiments of the present application, the thickness of the ceramic layer 430 is greater than the thickness of the tungsten carbide layer 440, and the side of the ceramic layer 430 close to the tungsten carbide layer 440 smoothly transitions into the tungsten carbide layer 440. Along the radial direction of the cylinder 410, the projection of the stirring mechanism 420 falls within the projection of the ceramic layer 430, and the projection of the stirring mechanism 420 does not overlap with the projection of the tungsten carbide layer 440.

[0110] The smooth transition between the ceramic layer 430 and the tungsten carbide layer 440 improves the smoothness of the inner wall 411 of the cylinder 410 and reduces the risk of material jamming on the inner wall 411 of the cylinder 410. The ceramic layer 430 is applied to the inner wall 411 of the cylinder 410 in the easily worn area, which can more specifically improve the wear resistance of the cylinder 410 and extend the service life of the equipment.

[0111] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A powder mixing device, characterized in that: include: A cylinder having an inner wall surface; A stirring mechanism, at least partially located in the cylinder; The inner wall surface includes a first area close to the stirring mechanism and a second area far from the stirring mechanism, the first area is provided with a ceramic layer, and the second area is provided with a tungsten carbide layer.

2. The powder mixing device according to claim 1, characterized in that: The ceramic layer includes a plurality of ceramic sheets, and the plurality of ceramic sheets are spliced ​​together to form the ceramic layer.

3. The powder mixing device according to claim 2, characterized in that: The ceramic sheet is attached to the first area by an adhesive.

4. The powder mixing device according to claim 2, characterized in that: There is a gap between two adjacent ceramic sheets, and the gap is filled with a binder.

5. The powder mixing device according to claim 2, characterized in that: The shape of the ceramic sheet is square, rectangular, rhombus or hexagon.

6. The powder mixing device according to claim 1, characterized in that: The material of the ceramic layer is aluminum oxide ceramic, silicon nitride ceramic, beryllium oxide ceramic or zirconium oxide ceramic.

7. The powder mixing device according to claim 1, characterized in that: The thickness of the ceramic layer is greater than that of the tungsten carbide layer, and a side of the ceramic layer close to the tungsten carbide layer smoothly transitions to the tungsten carbide layer.

8. The powder mixing device according to any one of claims 1 to 7, characterized in that: Along the radial direction of the cylinder, the projection of the stirring mechanism falls within the projection of the ceramic layer, and the projection of the stirring mechanism does not overlap with the projection of the tungsten carbide layer.

9. The powder mixing device according to any one of claims 1 to 7, characterized in that: The cylinder comprises a bottom wall, a peripheral wall and a top wall, the stirring mechanism comprises a stirring shaft and a stirring blade, the stirring shaft is rotatably arranged on the bottom wall, and the stirring blade is arranged on the stirring shaft and located above the bottom wall; The ceramic layer is arranged on the inner wall surface of the bottom wall and a part of the inner wall surface of the peripheral wall, and the tungsten carbide layer is arranged on the inner wall surface of the top wall and another part of the inner wall surface of the peripheral wall.

10. The powder mixing device according to any one of claims 1 to 7, characterized in that: The powder mixing equipment also includes: A cooling jacket is arranged on the outer side of the cylinder; The heat-insulating layer is arranged on the outside of the cooling jacket.

11. A battery production line, characterized in that: It comprises a powder mixing device as described in any one of claims 1 to 10, wherein the powder mixing device is used to mix positive electrode materials or negative electrode materials of a battery.

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