Pole piece insulation processing method and pole piece manufacturing equipment

Abstract

The application provides a pole piece insulation processing method and a pole piece manufacturing device. The pole piece insulation processing method comprises the following steps: slitting a pole piece into a plurality of sub-pole pieces; winding the sub-pole pieces to form a pole piece roll, the pole piece roll comprising a first end face formed by a slitting edge of the sub-pole pieces; and transferring insulation paint to the first end face to form an insulation layer covering at least the current collector of the sub-pole piece and burrs generated after the current collector is cut. The pole piece manufactured according to the technical scheme provided in the application can improve the reliability of a battery.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a tab insulation treatment method and a tab manufacturing device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the manufacturing process of the battery, the reliability of the battery is a problem that cannot be ignored. Therefore, how to improve the reliability of the battery is a technical problem that needs to be solved in the battery technology. SUMMARY

[0004] The application provides a tab insulation treatment method and a tab manufacturing device, which can improve the reliability of the battery.

[0005] The application is achieved by the following technical solutions:

[0006] In a first aspect, the application provides a tab insulation treatment method, which includes: slitting a tab into a plurality of sub-tabs; winding the sub-tabs to form a tab roll, the tab roll including a first end face formed by the slit edges of the sub-tabs; transferring insulation paint to the first end face to form an insulation layer covering at least the current collector of the sub-tab and burrs generated after the current collector is cut.

[0007] According to the tab insulation treatment method of the application, after the tab is slit into a plurality of sub-tabs, the sub-tabs are wound to form a tab roll, and the insulation paint is transferred to the first end face formed after the sub-tab is slit, so that an insulation layer is formed on the first end face. The operation is simple, and the insulation treatment efficiency of the slit edges of the sub-tab is high. At the same time, the insulation layer can cover at least the current collector and the burrs generated after the current collector is cut, that is, the insulation layer covers the current collector and part of the active material layer, so that the burrs are shielded. Since the insulation layer has an insulation effect, the insulation layer can reduce the risk of internal short circuit caused by the burrs piercing the isolation film, so that the battery can have high reliability.

[0008] According to some embodiments of the application, the transferring of the insulation paint to the first end face includes: rotating the tab roll to transfer the insulation paint to the first end face by rotating the coating roller.

[0009] In the above scheme, the insulation paint is transferred to the first end face by rotating the coating roller, which can improve the coating efficiency and is simple to operate.

[0010] According to some embodiments of the present application, the coating roller rotates in the same direction as the polar sheet roll.

[0011] In the above scheme, the coating roller rotates in the same direction as the polar sheet roll, so that the friction between the coating roller and the first end face is small, facilitating the adhesion of the insulating coating on the coating roller to the first end face.

[0012] According to some embodiments of the present application, the rotation speed of the coating roller is the same as the rotation speed of the polar sheet roll.

[0013] In the above scheme, the rotation speed of the coating roller is the same as the rotation speed of the polar sheet roll, the coating roller is relatively stationary with respect to the first end face, reducing friction, prolonging the service life of the coating roller, reducing damage to the first end face, and enabling the insulating coating to be evenly covered on the first end face.

[0014] According to some embodiments of the present application, before rotating the polar sheet roll, the polar sheet insulation processing method further comprises: the first end face is arranged in a vertical direction.

[0015] In the above scheme, the first end face is arranged in a vertical direction, the polar sheet roll occupies a small space in the horizontal direction, reducing the risk of interference between the polar sheet roll and other components (such as a glue coating device, a container containing insulating coating, etc.).

[0016] According to some embodiments of the present application, the coating roller is a conical roller, and the angle between the generatrix of the coating roller and the central axis of the coating roller is α, satisfying 30°≤α≤60°.

[0017] In the above scheme, the angle α between the generatrix of the coating roller and the central axis of the coating roller satisfies the above relationship (30°≤α≤60°), facilitating the rational arrangement of the polar sheet roll, reducing the risk of interference between the polar sheet roll and other components (such as a glue coating device, a container containing insulating coating, etc.), and facilitating the transfer of insulating coating to the first end face.

[0018] According to some embodiments of the present application, α=45°.

[0019] In the above scheme, when α=45°, the polar sheet roll 111 occupies a small space in the horizontal direction, reducing the risk of interference between the polar sheet roll 111 and other components (such as a glue coating device, a container containing insulating coating, etc.).

[0020] According to some embodiments of the present application, rotating the polar sheet roll, transferring the insulating coating to the first end face by rotating the coating roller, comprises: before transferring the insulating coating to the first end face by rotating the coating roller, removing excess insulating coating by a scraper.

[0021] In the above scheme, the excess insulation coating is scraped off by the scraper, the thickness of the insulation coating attached to the roller surface of the coating roller can be controlled, thereby the thickness of the insulation coating attached to the first end surface can be controlled, and the thickness of the insulation layer can be controlled.

[0022] According to some embodiments of the present application, before the insulation coating is transferred to the first end surface by the rotation of the coating roller, the pole piece insulation processing method further comprises: adjusting the gap between the scraper and the coating roller to control the thickness of the insulation coating attached to the coating roller.

[0023] In the above scheme, the gap between the scraper and the coating roller is adjusted, the thickness of the insulation coating attached to the coating roller can be controlled according to different coating requirements, and the thickness of the insulation layer attached to the first end surface can be controlled.

[0024] According to some embodiments of the present application, the solid content of the insulation coating is 10% to 30%.

[0025] In the above scheme, the solid content of the insulation coating satisfies the above relationship. On the one hand, the insulation layer is attached to the first end surface, and the thickness of the insulation layer after drying is relatively thick, and the insulation effect is good. On the other hand, the insulation layer is not easy to accumulate on the first end surface, and the risk of the insulation layer adhering to the adjacent two turns of pole pieces is reduced. If the solid content of the insulation coating is small (e.g. less than 10%), the thickness of the insulation layer after drying is small, and the insulation effect is poor. If the solid content of the insulation coating is large (e.g. greater than 30%), the insulation layer is easy to accumulate on the first end surface, and is easy to cause the insulation layer to adhere to the adjacent two turns of pole pieces.

[0026] According to some embodiments of the present application, the solid content of the insulation coating is 12% to 18%.

[0027] In the above scheme, compared with the solid content of the insulation coating being less than 12%, when the solid content of the insulation coating is greater than or equal to 12%, the thickness of the insulation layer attached to the first surface is relatively thick, and the insulation effect is good. Compared with the solid content of the insulation coating being greater than 18%, when the solid content of the insulation coating is less than or equal to 18%, the insulation coating is not easy to accumulate on the first end surface, and the risk of the insulation layer adhering to the adjacent two turns of pole pieces is reduced.

[0028] In a second aspect, the embodiments of the present application also provide a pole piece manufacturing device, comprising a slitting device, a winding device, a driving device and a coating device. The slitting device is used to slit a pole piece into a plurality of pole pieces; the winding device is used to wind the pole pieces to form a pole piece roll, the pole piece roll comprising a first end surface formed by a slitting edge of the pole pieces; and the coating device is used to transfer insulation coating to the first end surface to form an insulation layer covering at least the current collector of the pole pieces and burrs generated after the current collector is cut.

[0029] According to the polar piece manufacturing device, the polar piece is cut into a plurality of sub-polar pieces by the cutting device, and the polar piece manufacturing efficiency can be improved; the sub-polar pieces are wound by the collecting device, and the insulating coating is transferred to the first end face by the coating device, so that the insulating coating can be coated on all cutting edges of the sub-polar pieces to form an insulating layer on the first end face. The polar piece prepared by the polar piece manufacturing device has an insulating layer formed on the first end face of the cutting edge, the insulating layer can cover the burrs generated after the current collector is cut, and after the battery monomer is formed, the insulating layer can reduce the risk that the burrs pierce the isolation film to cause internal short circuit of the battery monomer, so that the battery monomer has higher reliability.

[0030] According to some embodiments of the present application, the polar piece manufacturing device further comprises a driving device for driving the polar piece roll to rotate.

[0031] In the above scheme, the polar piece roll is driven to rotate by the driving device, so that the insulating coating is uniformly coated on the first end face.

[0032] According to some embodiments of the present application, the polar piece manufacturing device further comprises a first container for containing the insulating coating, and the coating device comprises a coating roller and a coating roller driving member, the coating roller is in transmission connection with the coating roller driving member, and the coating roller driving member is used to drive the coating roller to rotate to transfer the insulating coating in the first container to the first end face.

[0033] In the above scheme, the insulating coating in the first container is transferred to the first end face by the rotation of the coating roller, so that the coating efficiency is higher and the operation is simple.

[0034] According to some embodiments of the present application, the coating roller is a conical roller, and an angle between a generatrix of the coating roller and a central axis of the coating roller is α, which satisfies 30°≤α≤60°.

[0035] In the above scheme, the coating roller is a conical roller, and α satisfies the above relationship, so that the polar piece roll can be reasonably arranged, the space occupied by the polar piece roll is smaller, and the polar piece roll is not easy to interfere with other components (such as a glue coating device, a container containing the insulating coating, etc.), so as to facilitate the transfer of the insulating coating in the first container to the first end face. If α is smaller (such as less than 60°) or larger (such as greater than 120°), the polar piece roll is easy to interfere with other components (such as a glue coating device, a container containing the insulating coating, etc.).

[0036] According to some embodiments of the present application, α=45°.

[0037] In the above scheme, when a = 45°, the first end face can be arranged in a vertical direction, the coating roller can coat the insulating coating in a horizontal state to the vertically arranged first end face, the pole piece coiled material occupies a small space in the horizontal direction, and the risk of interference between the pole piece coiled material and other components (such as a gluing device, a container containing insulating coating, etc.) is reduced.

[0038] According to some embodiments of the present application, the pole piece manufacturing equipment further comprises a scraper arranged in the first container, the scraper is arranged in a spaced manner with the coating roller, and the gap between the scraper and the coating roller is adjustable to control the thickness of the insulating coating adhered to the coating roller.

[0039] In the above scheme, the scraper is arranged in a spaced manner with the coating roller, and the gap between the scraper and the coating roller is adjustable to facilitate control of the thickness of the insulating coating adhered to the coating roller, thereby controlling the thickness of the insulating layer on the first end face to meet the coating requirements.

[0040] According to some embodiments of the present application, the scraper is arranged in parallel with the roller surface of the coating roller.

[0041] In the above scheme, the scraper is arranged in parallel with the roller surface of the coating roller, so that the gap between any position of the scraper and the roller surface of the coating roller in the extension direction of the scraper is the same, that is, the thickness of the insulating coating adhered to any position of the coating roller is the same, so that the consistency of the thickness of the insulating coating of the roller surface of the coating roller is higher.

[0042] According to some embodiments of the present application, the pole piece manufacturing equipment further comprises a stirring device for stirring the insulating coating in the first container.

[0043] In the above scheme, the stirring device is arranged to uniformly mix the components of the insulating coating, so that the thickness of the insulating layer formed on the first end face is uniform.

[0044] According to some embodiments of the present application, the pole piece manufacturing equipment further comprises a circulating device comprising a second container, a pipeline and a circulating pump, the second container is connected with the first container through the pipeline, and the circulating pump is used to drive the insulating coating to circulate between the first container and the second container.

[0045] In the above scheme, the circulating pump is used to drive the insulating coating to circulate between the first container and the second container, so that the components of the insulating coating are uniformly mixed, and the thickness of the insulating layer formed on the first end face is uniform.

[0046] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0048] Figure 1 The flowchart of the insulating treatment method of the pole piece provided by some embodiments of the present application is shown in the figure.

[0049] Figure 2 The schematic diagram of the slitting process of the pole piece provided by some embodiments of the present application is shown in the figure.

[0050] Figure 3 The schematic diagram of the coating device coating insulating paint on the first end face provided by some embodiments of the present application is shown in the figure.

[0051] Figure 4 The flowchart of the step "transferring insulating paint to the first end face" provided by some embodiments of the present application is shown in the figure.

[0052] Figure 5 The flowchart of the insulating treatment method of the pole piece provided by some embodiments of the present application is shown in the figure.

[0053] Figure 6 The structural schematic diagram of the pole piece manufacturing equipment provided by some embodiments of the present application is shown in the figure.

[0054] Figure 7 The structural schematic diagram of the pole piece manufacturing equipment provided by some embodiments of the present application is shown in the figure.

[0055] Figure 8 The structural schematic diagram of the stirring device provided by some embodiments of the present application is shown in the figure.

[0056] Figure 9 The structural schematic diagram of the circulating device provided by some embodiments of the present application is shown in the figure.

[0057] Figure: 100-slitting device; 10-pole piece; 11-sub-pole piece; 111-pole piece roll; 112-first end face; 200-winding device; 21-winding roller; 300-coating device; 31-coating roller; 32-coating roller driving member; 400-driving device; 500-first container; 600-scraper; 700-stirring device; 71-stirring paddle; 72-stirring driving member; 800-circulating device; 81-second container; 82-pipe; 83-circulating pump. DETAILED DESCRIPTION

[0058] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0060] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor are they necessarily mutually exclusive or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0061] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0063] "Multiple" appearing in the present application means two or more (including two), and similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0064] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0065] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and battery cells, and the battery cells or the battery module are accommodated in the box body.

[0066] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0067] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0068] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0069] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0070] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0071] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0072] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0073] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating treatment on the surface, stainless steel with silver plating treatment on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0074] As an example, the positive active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive active material can also be used.

[0075] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0076] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver plating surface treatment, stainless steel with a silver plating surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, and the like with carbon, nickel, or titanium can be employed.

[0077] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two surfaces of the negative electrode current collector.

[0078] As an example, the negative active material can employ a negative active material for a battery known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone or in combination of two or more.

[0079] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0080] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0081] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound to form the wound structure.

[0082] In some embodiments, the electrode assembly is a stacked structure.

[0083] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the like, and the embodiments of the present application are not particularly limited.

[0084] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, discharge capacity, charge-discharge rate, and the like, and in addition, the reliability of the battery also needs to be considered.

[0085] In the production process of the battery, the electrode tab production process includes a slitting process, in which the electrode tab is cut into a plurality of sub-electrode tabs. The slitting of the electrode tab is usually processed by a rolling cutter, which includes an upper cutter and a lower cutter. The upper cutter and the lower cutter are interlocked and tightly close to each other. The upper cutter and the lower cutter rotate in opposite directions synchronously, and the electrode tab is cut and separated by the interlocking part of the upper cutter and the lower cutter. Because the upper cutter and the lower cutter are interlocked and tightly close to each other, the wear and tear of the interlocking part will cause the blade to blunt and the blade to break. In the process of manufacturing battery cells, different material formulations and process requirements need to be met, and the electrode tab tends to be thickly coated or thinly coated in different working conditions, which will cause metal burrs on the slitting edge, that is, burrs are generated after the current collector is cut. The out-of-specification burrs can easily pierce the separator after the battery cell is formed, causing internal short circuit of the battery cell, and even fire and explosion, resulting in low reliability of the battery cell.

[0086] In view of this, in order to solve the problem that the burr pierces the separator and causes the battery cell to have low reliability, the embodiments of the present application provide a technical solution. The electrode tab is cut into a plurality of sub-electrode tabs, and the sub-electrode tab is wound to form an electrode tab roll. The electrode tab roll includes a first end face formed by the slitting edge of the sub-electrode tab. The insulating coating is transferred to the first end face, so that an insulating layer is formed on the first end face. The insulating layer can cover the burrs generated after the current collector is cut. This reduces the risk of the burrs piercing the separator and improves the reliability of the battery cell.

[0087] The electrode tab prepared by the above-mentioned electrode tab insulation treatment method transfers the insulating coating to the first end face formed after the slitting of the sub-electrode tab, so that an insulating layer is formed on the first end face. The insulating layer can cover at least the burrs generated after the current collector is cut, that is, the insulating layer covers the current collector and part of the active material layer, so that the burrs are shielded. Since the insulating layer has an insulating effect, the insulating layer can reduce the risk of the burrs piercing the separator and causing internal short circuit, so that the battery can have high reliability.

[0088] Please refer to Figures 1 to 3 , Figure 1 the flowchart of the electrode tab insulation treatment method provided by some embodiments of the present application; Figure 2A schematic diagram of a slitting process of the pole piece provided for some embodiments of the present application;

[0089] Figure 3 A schematic diagram of a coating device provided for some embodiments of the present application for coating the first end face with insulating coating. According to some embodiments of the present application, a pole piece insulating treatment method is provided, comprising:

[0090] S110, slitting the pole piece 10 into a plurality of sub-pole pieces 11;

[0091] S120, winding the sub-pole pieces 11 to form a pole piece web 111, the pole piece web 111 comprising a first end face 112 formed by the slitting edges of the sub-pole pieces 11;

[0092] S130, transferring insulating coating to the first end face 112 to form an insulating layer covering at least the current collector of the sub-pole pieces 11 and burrs generated after cutting of the current collector.

[0093] In the manufacturing process of the pole piece 10, the pole piece 10 is in a continuous strip structure, the pole piece 10 has a certain width, and the pole piece 10 can be slitted into a plurality of sub-pole pieces 11 to improve the manufacturing efficiency of the pole piece 10. For example, the pole piece 10 can be slitted into two sub-pole pieces 11, three sub-pole pieces 11, or more than three sub-pole pieces 11. In some embodiments, the sub-pole piece 11 can be referred to as the pole piece 10.

[0094] The sub-pole pieces 11 are wound on the winding roller 21 to form the pole piece web 111. The first end face 112 is formed by the slitting edges of the sub-pole pieces 11, and the first end face 112 can be annular as a whole, the first end face 112 has an inner ring and an outer ring, and the inner ring of the first end face 112 can be wound on the roller surface of the winding roller 21.

[0095] Since the sub-pole pieces 11 are in a continuous strip structure, the slitting edges of the sub-pole pieces 11 form burrs, and the sub-pole pieces 11 are wound to form the pole piece web 111, so as to facilitate the coating of the insulating coating on the slitting edges of the sub-pole pieces 11 and facilitate the adhesion of the insulating coating to all the slitting edges.

[0096] In the step "S130, transferring insulating coating to the first end face 112", the insulating coating can be manually applied to the first end face 112, or the insulating coating can be applied to the first end face 112 by the coating roller 31 of the coating device 300.

[0097] When viewed in a direction perpendicular to the first end face 112, the burrs generated after cutting of the current collector partially overlap the active material layer, and when the insulating coating is transferred to the first end face 112, the insulating layer covers the current collector and at least part of the active material layer, that is, the insulating layer partially overlaps the active material layer in the thickness direction of the sub-pole piece 11, so that the insulating layer covers at least the current collector of the sub-pole piece 11 and the burrs generated after cutting of the current collector.

[0098] The insulating coating can include a solid insulating material, a binder, and a solvent. The solid insulating material can be selected from at least one of BaSO4, CaSiO3, γ-AlOOH, CaSiO4, polytetrafluoroethylene. The binder is selected from at least one of a polyvinylidene fluoride binder, a styrene butadiene rubber binder, a polyetherimide binder, a polyacrylic acid sodium binder, a polytetrafluoroethylene binder, an acrylate binder, a carboxymethyl cellulose binder. The solvent is selected according to the properties of the binder. When the binder is a water-based binder, a water-based solvent (such as distilled water, etc.) can be selected. When the binder is an oil-based binder, an oil-based solvent (such as N-methyl pyrrolidone, etc.) can be selected.

[0099] According to the pole piece insulation processing method of the embodiments of the present application, after the pole piece 10 is cut into a plurality of sub-pole pieces 11, the sub-pole pieces 11 are wound to form a pole piece roll 111, the pole piece roll 111 is rotated, and the insulating coating is transferred to the first end face 112 formed after cutting of the sub-pole piece 11, so that an insulating layer is formed on the first end face 112. The operation is simple, and the insulation processing efficiency of the cutting edge of the sub-pole piece 11 is high. At the same time, the insulating layer can cover at least the burr generated after cutting of the current collector, that is, the insulating layer covers the current collector and part of the active material layer, so that the burr is shielded. Since the insulating layer has an insulating effect, the insulating layer can reduce the risk of internal short circuit caused by the burr piercing the isolation film, so that the battery can have higher reliability.

[0100] Please refer to Figure 4 , Figure 4 The flowchart diagram of the step "transferring the insulating coating to the first end face" provided by some embodiments of the present application. According to some embodiments of the present application, the insulating coating is transferred to the first end face 112, which includes:

[0101] S131, rotating the pole piece roll 111, and transferring the insulating coating to the first end face 112 by rotating the coating roller 31.

[0102] Rotating the pole piece roll 111 so that the insulating coating covers the inner and outer circles of the first end face 112 can improve the thickness uniformity of the insulating coating attached to the first end face 112.

[0103] During the rotation of the coating roller 31, the roller surface of the coating roller 31 is attached with the insulating coating. With the rotation of the coating roller 31, the coating roller 31 transfers the insulating coating to the first end face 112 to form an insulating layer on the first end face 112.

[0104] For example, when the coating roller 31 rotates, the coating roller 31 rotates to the container containing the insulating coating first, the roller surface of the coating roller 31 is soaked in the insulating coating, the insulating coating is attached to the roller surface of the coating roller 31, and when the coating roller 31 rotates, the insulating coating on the roller surface contacts the first end surface 112, and the insulating coating is attached to the first end surface 112, thereby forming an insulating layer.

[0105] When the coating roller 31 coats the insulating coating, the pole piece web 111 also rotates, so that the insulating coating can be coated to the inner and outer circles of the first end surface 112.

[0106] In the above scheme, the insulating coating is transferred to the first end surface 112 by rotating the coating roller 31, which can improve the coating efficiency and is simple to operate.

[0107] Please refer to Figure 3 According to some embodiments of the present application, the coating roller 31 rotates in the same direction as the pole piece web 111.

[0108] The coating roller 31 rotates in the same direction as the pole piece web 111, so that the friction between the coating roller 31 and the first end surface 112 is small, so that the insulating coating on the coating roller 31 is attached to the first end surface 112.

[0109] Please refer to Figure 3 According to some embodiments of the present application, the rotation speed of the coating roller 31 is the same as the rotation speed of the pole piece web 111.

[0110] The rotation speed of the coating roller 31 is the same as the rotation speed of the pole piece web 111, that is, the rotation speed of the coating roller 31 is 1:1 compared with the rotation speed of the pole piece web 111, in combination with the coating roller 31 rotating in the same direction as the pole piece web 111, the coating roller 31 is relatively stationary with the first end surface 112, reducing friction, prolonging the service life of the coating roller 31, reducing damage to the first end surface 112, and enabling the insulating coating to be evenly covered on the first end surface 112.

[0111] Please refer to Figure 5 , Figure 5 A flowchart of a pole piece insulation processing method is provided for another embodiment of the present application. According to some embodiments of the present application, before rotating the pole piece web 111, the pole piece insulation processing method further comprises:

[0112] S130a, the first end surface 112 is arranged in a vertical direction.

[0113] If the first end surface 112 is arranged along the horizontal direction, the coating roller 31 coats the insulating coating above or below the first end surface 112. When the coating roller 31 coats the insulating coating above the first end surface 112, the insulating coating is prone to dripping onto the first end surface 112, so that the thickness of the insulating layer formed on the first end surface 112 is uneven. When the coating roller 31 coats the insulating coating below the first end surface 112, the rotating pole piece roll 111 is prone to being separated from the winding roller 21, that is, the pole piece roll 111 is prone to falling off, which causes damage to the pole piece roll 111.

[0114] In some embodiments, the first end surface 112 can also be arranged obliquely relative to the vertical direction, for example, the first end surface 112 is arranged obliquely downward, or the first end surface 112 is arranged obliquely upward.

[0115] In the above scheme, the first end surface 112 is arranged along the vertical direction, the pole piece roll 111 occupies a small space, and the risk of interference between the pole piece roll 111 and other components (such as a gluing device, a container containing insulating coating, etc.) is reduced.

[0116] Please refer to Figure 3 and Figure 7 According to some embodiments of the present application, the coating roller 31 is a conical roller, and the angle between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 is α, which satisfies 30°≤α≤60°.

[0117] The coating roller 31 is a conical roller, and along the extension direction of the central axis P1 of the coating roller 31, the coating roller 31 has a large-diameter end and a small-diameter end. When the coating roller 31 cooperates with the first end surface 112, the small-diameter end of the coating roller 31 can correspond to the inner ring of the first end surface 112, and the large-diameter end of the coating roller 31 can correspond to the outer ring of the first end surface 112, so that when the coating roller 31 rotates, the insulating coating attached to the roller surface of the coating roller 31 can cover the inner ring and the outer ring of the first end surface 112.

[0118] When the insulating coating is transferred to the first end surface 112 by the coating roller 31, since the liquid surface of the insulating coating is parallel to the horizontal plane, in order to make the thickness of the insulating coating attached to the roller surface of the coating roller 31 consistent, the roller surface of the coating roller 31 needs to be parallel to the liquid surface of the insulating coating, and the roller surface of the coating roller 31 that cooperates with the first end surface 112 needs to be parallel to the first end surface 112. Therefore, the angle between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 can determine the arrangement direction of the first end surface 112.

[0119] Alternatively, α can be, but is not limited to, 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0120] If the taper of the coating roller 31 is small (e.g., less than 60°) or the taper of the coating roller 31 is large (e.g., greater than 120°), the pole piece coil 111 occupies a large space in the horizontal direction, so that the pole piece coil 111 is prone to interfere with other components (e.g., a gluing device, a container containing insulating paint, etc.).

[0121] The angle a between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 satisfies the above relationship (30°≤a≤60°), which facilitates reasonable arrangement of the pole piece coil 111, and the pole piece coil 111 is not prone to interfere with other components (e.g., a gluing device, a container containing insulating paint, etc.), so as to facilitate transfer of the insulating paint to the first end surface 112.

[0122] According to some embodiments of the present application, a = 45°.

[0123] When a = 45°, the roller surface of the coating roller 31 on one side of the central axis P1 of the coating roller 31 can be arranged in a horizontal direction, and the roller surface of the coating roller 31 on the other side of the central axis P1 of the coating roller 31 can be arranged in a vertical direction. At this time, the first end surface 112 can be arranged in a vertical direction, so as to facilitate transfer of the insulating paint in the first container 500 to the first end surface 112 by the coating roller 31. The coating roller 31 and the first end surface 112 can have a good contact effect, so that the insulating paint is uniformly coated on the first end surface 112.

[0124] When a = 45°, the pole piece coil 111 occupies a small space in the horizontal direction, reducing the risk of interference between the pole piece coil 111 and other components (e.g., a gluing device, a container containing insulating paint, etc.).

[0125] According to some embodiments of the present application, rotating the pole piece coil 111 and transferring the insulating paint to the first end surface 112 by rotating the coating roller 31 comprises: before transferring the insulating paint to the first end surface 112 by rotating the coating roller 31, removing excess insulating paint by the scraper 600.

[0126] In the above scheme, the excess insulating paint is removed by the scraper 600, which can control the thickness of the insulating paint attached to the roller surface of the coating roller 31, thereby controlling the thickness of the insulating paint attached to the first end surface 112, and further achieving control of the thickness of the insulating layer.

[0127] According to some embodiments of the present application, before rotating the pole piece coil 111 and transferring the insulating paint to the first end surface 112 by rotating the coating roller 31, the pole piece insulation processing method further comprises: adjusting the gap between the scraper 600 and the coating roller 31 to control the thickness of the insulating paint attached to the coating roller 31.

[0128] In the above scheme, the gap between the doctor blade 600 and the coating roller 31 is adjusted, so as to control the thickness of the insulating coating adhered to the coating roller 31 according to different coating requirements, and thus the thickness of the insulating layer adhered to the first end surface 112 is controlled.

[0129] According to some embodiments of the present application, the solid content of the insulating coating is 10% to 30%.

[0130] The solid content of the insulating coating refers to the proportion of the solid mass in the total mass of the insulating coating. The solid content of the insulating coating can be detected by a solid content detector.

[0131] The insulating coating can be a diluted slurry, and the solid content of the insulating coating satisfies 10% to 30%.

[0132] Alternatively, the solid content of the insulating coating can be, but is not limited to, 10%, 12%, 15%, 17%, 20%, 22%, 25%, 27%, 30%, etc.

[0133] If the solid content of the insulating coating is small (e.g., less than 10%), the thickness of the insulating layer after drying is small, and the insulating effect is poor. If the solid content of the insulating coating is large (e.g., greater than 30%), the insulating layer is prone to accumulate on the first end surface 112, which can easily cause the insulating layer to adhere to the adjacent two turns of the sub-pole piece 11.

[0134] The solid content of the insulating coating satisfies the above relationship (10% to 30%), on the one hand, the insulating layer is easy to adhere to the first end surface 112, and the thickness of the insulating layer after drying is thick, and the insulating effect is good; on the other hand, the insulating layer is not prone to accumulate on the first end surface 112, which reduces the risk of the insulating layer adhering to the adjacent two turns of the sub-pole piece 11.

[0135] According to some embodiments of the present application, the solid content of the insulating coating is 12% to 18%.

[0136] Alternatively, the solid content of the insulating coating can be, but is not limited to, 12%, 13%, 14%, 15%, 16%, 17%, 18%, etc.

[0137] Compared with the solid content of the insulating coating being less than 12%, when the solid content of the insulating coating is greater than or equal to 12%, the thickness of the insulating layer adhered to the first surface is thick, and the insulating effect is good; compared with the solid content of the insulating coating being greater than 18%, when the solid content of the insulating coating is less than or equal to 18%, the insulating coating is not prone to accumulate on the first end surface 112, which reduces the risk of the insulating layer adhering to the adjacent two turns of the sub-pole piece 11.

[0138] According to some embodiments of the present application, the thickness of the insulating layer is 10 μm to 200 μm.

[0139] The thickness of the insulation layer can be the thickness of the insulation layer after the insulation coating adhered to the first end surface 112 solidifies. The pole piece web 111 can be unwound, and the distance between the first end surface 112 and the surface of the insulation layer away from the first end surface 112 can be measured in a direction perpendicular to the first end surface 112 to obtain the thickness of the insulation layer.

[0140] Optionally, the thickness of the insulation layer can be, but is not limited to, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 100 μm, 150 μm, 200 μm, etc.

[0141] In the above scheme, the thickness of the insulation layer satisfies the above relationship (10 μm-200 μm), which has a good insulation effect on the one hand and is not easy to accumulate on the first end surface 112 on the other hand.

[0142] If the thickness of the insulation layer is too thin (e.g., less than 10 μm), the insulation effect of the insulation layer is poor, and the burr is easy to pierce the insulation layer. If the thickness of the insulation layer is too thick (e.g., greater than 200 μm), the insulation coating is easy to flow into the gap between the two adjacent layers of pole pieces 11 after adhering to the first end surface 112, thereby bonding the two adjacent layers of pole pieces 11. After the insulation layer solidifies, the insulation layer is easy to separate from the pole pieces 11 when the pole pieces 11 are unwound.

[0143] According to some embodiments of the present application, the thickness of the insulation layer is 20 μm-60 μm.

[0144] Optionally, the thickness of the insulation layer can be, but is not limited to, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, etc.

[0145] Compared with the thickness of the insulation layer being less than 20 μm, when the thickness of the insulation layer is greater than or equal to 20 μm, the thickness of the insulation layer is thick, and has a good insulation effect. Compared with the thickness of the insulation layer being greater than 60 μm, when the thickness of the insulation layer is less than or equal to 60 μm, the insulation layer is not easy to accumulate on the first end surface 112, thereby reducing the risk of the insulation layer bonding the two adjacent layers of pole pieces 11.

[0146] In the above embodiments, the thickness of the insulation layer can be determined by the thickness of the insulation coating adhered to the coating roller 31. For example, the thickness of the insulation coating on the coating roller 31 can be controlled by adjusting the gap between the doctor blade and the coating roller 31.

[0147] Please refer to Figure 2 and Figure 3 , and further refer to Figure 6 and Figure 7 , Figure 6 a structural schematic block diagram of a pole piece manufacturing device provided by some embodiments of the present application, Figure 7Fig. 1 shows a schematic diagram of a part of a structure of an electrode sheet manufacturing apparatus according to some embodiments of the present application. According to some embodiments of the present application, the electrode sheet manufacturing apparatus can be used to manufacture an electrode sheet 10 by using any of the electrode sheet insulation processing methods provided by the embodiments of the present application. The electrode sheet manufacturing apparatus includes a slitting device 100, a winding device 200, and a coating device 300. The slitting device 100 is configured to slit the electrode sheet 10 into a plurality of sub-electrode sheets 11. The winding device 200 is configured to wind the sub-electrode sheets 11 to form an electrode sheet roll 111, the electrode sheet roll 111 including a first end surface 112 formed by the slit edges of the sub-electrode sheets 11. The coating device 300 is configured to transfer an insulating coating to the first end surface 112 to form an insulating layer covering at least the current collector of the sub-electrode sheets 11 and the burrs generated after the current collector is cut.

[0148] The slitting device 100 is configured to slit the electrode sheet 10 into a plurality of sub-electrode sheets 11. The slitting device 100 can include an upper cutter and a lower cutter, and the electrode sheet 10 is slit by the engagement of the upper cutter and the lower cutter.

[0149] The winding device 200 is configured to wind the sub-electrode sheets 11. The winding device 200 can include a winding roller 21 and a winding driving member, and the winding driving member drives the winding roller 21 to rotate to wind the sub-electrode sheets 11 onto the winding roller 21. After the sub-electrode sheets 11 are wound onto the winding roller 21, the electrode sheet roll 111 is formed, and the winding roller 21 follows the electrode sheet roll 111 to move between subsequent processes.

[0150] The coating device 300 is configured to transfer an insulating coating to the first end surface 112. The coating device 300 can include a coating roller 31, and the insulating coating is transferred to the first end surface 112 by the coating roller 31. For example, an operator can manually hold the coating roller 31 to transfer the insulating coating to the first end surface 112, or the coating roller 31 can be driven by a driving member (e.g., a motor) to transfer the insulating coating to the first end surface 112.

[0151] Slitting the electrode sheet 10 into a plurality of sub-electrode sheets 11 by the slitting device 100 can improve the manufacturing efficiency of the electrode sheet 10. Winding the sub-electrode sheets 11 by the winding device and transferring the insulating coating to the first end surface 112 by the coating device 300 can coat the insulating coating on all the slit edges of the sub-electrode sheets 11 to form the insulating layer on the first end surface 112.

[0152] The electrode sheet 10 manufactured by the electrode sheet manufacturing apparatus has the insulating layer formed on the first end surface 112 of the slit edge, and the insulating layer can cover the current collector and the burrs generated after the current collector is cut. After the battery cell is formed, the insulating layer can reduce the risk of the burrs piercing the separator to cause internal short circuit of the battery cell, and thus the battery cell has higher reliability.

[0153] Please refer toFigure 7 According to some embodiments of the present application, the pole piece manufacturing device further comprises a driving device 400 configured to drive the rotation of the pole piece web 111.

[0154] The driving device 400 is a device configured to drive the rotation of the pole piece web 111. The driving device 400 can comprise a driving motor, and the winding roller 21 of the pole piece web 111 is drivingly connected to the output end of the driving motor, and the pole piece web 111 is driven to rotate by the driving motor.

[0155] In the above scheme, the pole piece web 111 is driven to rotate by the driving device 400, so as to cover the inner and outer circles of the first end surface 112 with the insulating coating, which can improve the thickness uniformity of the insulating coating attached to the first end surface 112.

[0156] Please refer to Figure 3 and Figure 7 According to some embodiments of the present application, the pole piece manufacturing device further comprises a first container 500 configured to contain the insulating coating, and the coating device 300 comprises a coating roller 31 and a coating roller driving member 32, the coating roller 31 is drivingly connected to the coating roller driving member 32, and the coating roller driving member 32 is configured to drive the rotation of the coating roller 31, so as to transfer the insulating coating in the first container 500 to the first end surface 112.

[0157] The first container 500 is a container configured to store the insulating coating, and the first container 500 can be arranged adjacent to the pole piece web 111, so as to facilitate the coating roller 31 to transfer the insulating coating to the first end surface 112. The first container 500 can be a glue bucket with a certain capacity.

[0158] In some embodiments, the first container 500 is provided with a residual amount detection device configured to detect the residual amount of the insulating coating in the first container 500. For example, the residual amount detection device can be a liquid level meter configured to detect the liquid level of the insulating coating in the first container 500.

[0159] The coating roller 31 is rotatable relative to the first container 500, and the coating roller 31 is driven to rotate by the coating roller driving member 32. The coating roller 31 first contacts the insulating coating in the first container 500, the roller surface of the coating roller 31 is attached with the insulating coating, and then the coating roller 31 transfers the insulating coating to the first end surface 112.

[0160] In some embodiments, the coating roller 31 and the coating roller driving member 32 are arranged at the opening above the first container 500, and the coating roller 31 contacts the insulating coating in the first container 500, so as to facilitate the coating roller 31 to transfer the insulating coating to the first end surface 112.

[0161] In some embodiments, the coating roller 31 and the coating roller driving member 32 are arranged on a manipulator, and the manipulator is used to transfer the coating roller 31 to the opening of the first container 500, so that the coating roller 31 can contact the insulating coating in the first container 500 when the coating roller 31 rotates, thereby transferring the insulating coating to the first end face 112.

[0162] In the above scheme, the coating roller 31 transfers the insulating coating in the first container 500 to the first end face 112, so that the coating efficiency is higher.

[0163] In some embodiments, the roller surface of the coating roller 31 can include a brush-shaped flexible structure, which can adsorb the insulating coating, so as to facilitate the coating roller 31 to attach the insulating coating to the first end face 112 when the coating roller 31 contacts the first end face 112.

[0164] Please refer to Figure 3 and Figure 7 According to some embodiments of the present application, the coating roller 31 is a conical roller, and the angle between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 is α, which satisfies 30°≤α≤60°.

[0165] The coating roller 31 is a conical roller, and along the extension direction of the central axis P1 of the coating roller 31, the coating roller 31 has a large-diameter end and a small-diameter end. When the coating roller 31 cooperates with the first end face 112, the small-diameter end of the coating roller 31 can correspond to the inner ring of the first end face 112, and the large-diameter end of the coating roller 31 can correspond to the outer ring of the first end face 112, so that when the coating roller 31 rotates, the insulating coating can cover the inner ring and the outer ring of the first end face 112.

[0166] Since the liquid surface of the insulating coating in the first container 500 is parallel to the horizontal plane, in order to make the thickness of the insulating coating attached to the roller surface of the coating roller 31 consistent, the roller surface of the coating roller 31 located in the first container 500 needs to be parallel to the liquid surface of the insulating coating, and the roller surface of the coating roller 31 cooperating with the first end face 112 needs to be parallel to the first end face 112, then the angle between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 can determine the setting direction of the first end face 112.

[0167] Alternatively, α can be, but is not limited to, 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0168] The angle a between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 satisfies the above relationship, which facilitates reasonable arrangement of the pole piece web 111, and the pole piece web 111 is less likely to interfere with other components (such as a gluing device, a container containing insulating paint, etc.), so as to facilitate transfer of the insulating paint in the first container 500 to the first end face 112. If the taper of the coating roller 31 is small (for example, less than 60°) or the taper of the coating roller 31 is large (for example, greater than 120°), the pole piece web 111 occupies a large space in the horizontal direction, so that the pole piece web 111 is easily interfered with other components (such as a gluing device, a container containing insulating paint, etc.).

[0169] According to some embodiments of the present application, a = 45°.

[0170] When a = 45°, the roller surface of the coating roller 31 on one side of the central axis P1 of the coating roller 31 can be arranged in a horizontal direction, and the roller surface of the coating roller 31 on the other side of the central axis P1 of the coating roller 31 can be arranged in a vertical direction. At this time, the first end face 112 can be arranged in a vertical direction, so as to facilitate transfer of the insulating paint in the first container 500 to the first end face 112 by the coating roller 31. The coating roller 31 and the first end face 112 can have a good contact effect, so that the insulating paint is uniformly coated on the first end face 112.

[0171] In the above scheme, when a = 45°, the first end face 112 can be arranged in a vertical direction, and the coating roller 31 can coat the insulating paint in a horizontal state to the vertically arranged first end face 112. The pole piece web 111 occupies a small space in the horizontal direction, reducing the risk of interference between the pole piece web 111 and other components (such as a gluing device, a container containing insulating paint, etc.).

[0172] Please refer to Figure 3 and Figure 7 According to some embodiments of the present application, the pole piece manufacturing equipment further comprises a scraper 600, which is arranged at the first container 500, and the scraper 600 is arranged in a spaced manner with the coating roller 31. The gap between the scraper 600 and the coating roller 31 is adjustable, so as to control the thickness of the insulating paint attached to the coating roller 31.

[0173] The scraper 600 can be arranged at the opening of the first container 500, and the gap between the scraper 600 and the coating roller 31 determines the thickness of the insulating paint attached to the coating roller 31.

[0174] When the coating roller 31 is soaked in the insulating paint, the roller surface with the insulating paint attached is rotated to the scraper 600, and the scraper 600 scoops off the excess insulating paint on the roller surface, leaving an appropriate amount of insulating paint on the roller surface. With the rotation of the coating roller 31, when the roller surface contacts the first end face 112, the insulating paint contacts the first end face 112 to complete the coating.

[0175] When the gap between the doctor blade 600 and the coating roller 31 is small, the thickness of the insulation coating attached to the coating roller 31 is thin; when the gap between the doctor blade 600 and the coating roller 31 is large, the thickness of the insulation coating attached to the coating roller 31 is thick.

[0176] The connecting position of the doctor blade 600 to the first container 500 is adjustable, so as to change the gap between the doctor blade 600 and the coating roller 31. For example, a sliding groove is arranged on the first container 500, a through hole is arranged on the doctor blade 600, and the doctor blade 600 is connected to the first container 500 through a locking bolt arranged in the through hole and the sliding groove. When it is needed to adjust the gap between the doctor blade 600 and the coating roller 31, the position of the locking bolt in the sliding groove can be adjusted, the connecting position of the doctor blade 600 to the first container 500 is changed, and the gap between the doctor blade 600 and the coating roller 31 is adjusted.

[0177] In the above scheme, the doctor blade 600 is arranged apart from the coating roller 31, and the gap between the doctor blade 600 and the coating roller 31 is adjustable, so as to control the thickness of the insulation coating attached to the coating roller 31, control the thickness of the insulation layer on the first end face 112, and meet the coating requirement.

[0178] According to some embodiments of the present application, the doctor blade 600 is arranged parallel to the roller surface of the coating roller 31.

[0179] The doctor blade 600 is arranged parallel to the roller surface of the coating roller 31, so that the gap between any position of the doctor blade 600 and the roller surface of the coating roller 31 is the same along the extension direction of the doctor blade 600, that is, the thickness of the insulation coating attached to any position of the coating roller 31 is the same, and the consistency of the thickness of the insulation coating on the roller surface of the coating roller 31 is high.

[0180] Please refer to Figure 8 , Figure 8 A structural schematic diagram of a stirring device is provided for some embodiments of the present application. According to some embodiments of the present application, the pole piece manufacturing equipment further comprises a stirring device 700, which is used for stirring the insulation coating located in the first container 500.

[0181] The stirring device 700 can comprise a stirring paddle 71 and a stirring driving member 72. The stirring paddle 71 can be arranged in the first container 500, and the stirring paddle 71 is in transmission connection with the stirring driving member 72. The stirring driving member 72 is used for driving the stirring paddle 71 to rotate, so as to stir the insulation coating located in the first container 500. For example, the stirring driving member 72 can comprise a motor, which drives the stirring paddle 71 to rotate.

[0182] In the above scheme, the arrangement of the stirring device 700 can make the components of the insulation coating mix uniformly, so as to make the thickness of the insulation layer formed on the first end face 112 uniform.

[0183] Please refer toFigure 9 , Figure 9 A structure schematic diagram of a circulating device provided for some embodiments of the present application is shown. According to some embodiments of the present application, the pole piece manufacturing device further comprises a circulating device 800, the circulating device 800 comprising a second container 81, a pipeline 82 and a circulating pump 83, the second container 81 being connected to the first container 500 through the pipeline 82, and the circulating pump 83 being used to drive the insulation coating to circulate between the first container 500 and the second container 81.

[0184] The second container 81, the pipeline 82, the first container 500 and the circulating pump 83 constitute a circulating loop, the circulating pump 83 drives the insulation coating to flow in the circulating loop, and the insulation coating is circulated between the second container 81 and the first container 500, so as to make the insulation coating in the first container 500 uniformly mixed, and reduce the risk of precipitation of components in the insulation coating.

[0185] In some embodiments, the circulating pump 83 can comprise a pneumatic diaphragm pump or a screw pump.

[0186] In the above scheme, the insulation coating is driven by the circulating pump 83 to circulate between the first container 500 and the second container 81, so that the components of the insulation coating are uniformly mixed, and the thickness of the insulation layer formed on the first end face 112 is uniform.

[0187] Please refer to Figure 2 , Figure 3 , Figure 7 and Figure 9According to some embodiments of the present application, the present application provides a pole piece manufacturing device, which comprises a slitting device 100, a winding device 200, a driving device 400, a coating device 300, a first container 500, a scraper 600 and a circulating device 800. The slitting device 100 comprises an upper cutter and a lower cutter, which cooperate to cut the pole piece 10 and divide the pole piece 10 into a plurality of sub-pole pieces 11. The winding device 200 comprises a winding roller 21 and a winding driving member, which is in transmission connection with the winding roller 21 and is used to drive the winding roller 21 to rotate so as to wind the sub-pole pieces 11 on the winding roller 21. The driving device 400 comprises a driving motor, which is used to drive the pole piece web 111 to rotate. The first container 500 is used to contain insulating coating. The coating device 300 comprises a coating roller 31 and a coating roller driving member 32, which is in transmission connection with the coating roller 31 and is used to drive the coating roller 31 to rotate so as to transfer the insulating coating in the first container 500 to the first end face 112. The coating roller 31 is a conical roller, the angle between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 is 45°, and the first end face 112 can be arranged in the vertical direction. The scraper 600 is arranged at the opening of the first container 500 and is spaced apart from the coating roller 31. The gap between the scraper 600 and the coating roller 31 is adjustable so as to control the thickness of the insulating coating adhered to the coating roller 31. The circulating device 800 comprises a second container 81, a pipeline 82 and a circulating pump 83. The second container 81 is connected with the first container 500 through the pipeline 82, and the second container 81, the first container 500, the pipeline 82 and the circulating pump 83 form a circulating loop. The circulating pump 83 is used to drive the insulating coating to circulate between the first container 500 and the second container 81.

[0188] According to some embodiments of the present application, the present application provides a pole piece manufacturing device, which comprises a slitting device 100, a winding device 200, a driving device 400, a coating device 300, a first container 500, a scraper 600 and a circulating device 800. The slitting device 100 comprises an upper cutter and a lower cutter, which cooperate to cut the pole piece 10 and divide the pole piece 10 into a plurality of sub-pole pieces 11. The winding device 200 comprises a winding roller 21 and a winding driving member, which is in transmission connection with the winding roller 21 and is used to drive the winding roller 21 to rotate so as to wind the sub-pole pieces 11 on the winding roller 21. The driving device 400 comprises a driving motor, which is used to drive the pole piece web 111 to rotate. The first container 500 is used to contain insulating coating. The coating device 300 comprises a coating roller 31 and a coating roller driving member 32, which is in transmission connection with the coating roller 31 and is used to drive the coating roller 31 to rotate so as to transfer the insulating coating in the first container 500 to the first end face 112. The coating roller 31 is a conical roller, the angle between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 is 45°, and the first end face 112 can be arranged in the vertical direction. The scraper 600 is arranged at the opening of the first container 500 and is spaced apart from the coating roller 31. The gap between the scraper 600 and the coating roller 31 is adjustable so as to control the thickness of the insulating coating adhered to the coating roller 31. The circulating device 800 comprises a second container 81, a pipeline 82 and a circulating pump 83. The second container 81 is connected with the first container 500 through the pipeline 82, and the second container 81, the first container 500, the pipeline 82 and the circulating pump 83 form a circulating loop. The circulating pump 83 is used to drive the insulating coating to circulate between the first container 500 and the second container 81.

[0189] As shown in Figure 2 , the pole piece 10 is divided into a plurality of sub-pole pieces 11;

[0190] The sub-pole pieces 11 are wound to form a pole piece web 111, and the pole piece web 111 comprises a first end face 112 formed by the slitting edges of the sub-pole pieces 11;

[0191] As shown in Figure 7 , the first end face 112 is arranged in the vertical direction;

[0192] As shown in Figure 3 , the pole piece web 111 is rotated, and the insulating coating is transferred to the first end face 112 by the rotation of the coating roller 31, so as to form an insulating layer covering at least the current collector of the sub-pole piece 11 and the burrs generated after the current collector is cut.

[0193] wherein, as shown in Figure 3 and Figure 7 The coating roller 31 is a conical roller, and the angle a between the generatrix of the coating roller 31 and the central axis P1 of the coating roller 31 is 45°. The coating roller 31 rotates in the same direction as the pole piece web 111, and the rotating speed of the coating roller 31 is the same as the rotating speed of the pole piece web 111.

[0194] Before the insulation coating is transferred to the first end surface 112 by the rotation of the coating roller 31, the thickness of the insulation coating adhered to the coating roller 31 can be controlled by adjusting the gap between the doctor blade 600 and the coating roller 31.

[0195] According to the technical scheme provided in the present application, the first end surface 112 of the cut edge of the prepared pole piece 10 is attached with an insulation layer, and the insulation layer covers the current collector and part of the active material layer, so that the insulation layer shields the burrs generated after the current collector is cut. The insulation layer has good insulation effect, and when the pole piece 10 constitutes a battery monomer, the risk of internal short circuit of the battery monomer caused by the burrs piercing the isolation film can be reduced, so that the battery monomer can have higher reliability.

[0196] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical schemes falling within the scope of the claims.

Claims

1. A method of insulating an electrode sheet, characterized by, The method comprises: slitting the pole piece into a plurality of sub-pole pieces; winding the sub-pole pieces to form a pole piece roll, the pole piece roll comprising a first end face formed by the slitting edges of the sub-pole pieces; transferring an insulating coating to the first end face to form an insulating layer covering at least the current collectors of the sub-pole pieces and burrs generated after cutting of the current collectors; the transferring of the insulating coating to the first end face comprises: rotating the pole piece roll to transfer the insulating coating to the first end face by rotation of a coating roller; the coating roller rotates in the same direction as the pole piece roll; before the rotating of the pole piece roll, the pole piece insulation processing method further comprises: the first end face is arranged in a vertical direction; the coating roller is a conical roller, and an angle between a generatrix of the coating roller and a central axis of the coating roller is α, satisfying 30°≤α≤60°; the rotating of the pole piece roll to transfer the insulating coating to the first end face by rotation of a coating roller comprises: before the transferring of the insulating coating to the first end face by rotation of the coating roller, the excess insulating coating is removed by a doctor blade; the first end face as a whole is annular.

2. The pole piece insulation process of claim 1, wherein, The rotating speed of the coating roller is the same as the rotating speed of the pole piece roll.

3. The pole piece insulation process of claim 1, wherein, α=45°。 4. The pole piece insulation process of claim 1, wherein, before the rotating of the pole piece roll to transfer the insulating coating to the first end face by rotation of a coating roller, the pole piece insulation processing method further comprises: adjusting a gap between the doctor blade and the coating roller to control the thickness of the insulating coating adhered to the coating roller.

5. The pole piece insulation process of claim 1, wherein, The solid content of the insulating coating is 10% to 30%.

6. The pole piece insulating process method of claim 5, wherein, The solid content of the insulating coating is 12% to 18%.

7. A pole piece manufacturing apparatus for performing the pole piece insulation processing method according to any one of claims 1 to 6, characterized by The method comprises: a slitting device for slitting a pole piece into a plurality of sub-pole pieces; a winding device for winding the sub-pole pieces to form a pole piece roll, the pole piece roll comprising a first end face formed by the slitting edges of the sub-pole pieces; a coating device for transferring an insulating coating to the first end face to form an insulating layer covering at least the current collectors of the sub-pole pieces and burrs generated after cutting of the current collectors; the pole piece manufacturing equipment further comprises a first container for containing the insulating coating, the coating device comprises a coating roller and a coating roller driving member, the coating roller is in transmission connection with the coating roller driving member, and the coating roller driving member is used to drive the coating roller to rotate to transfer the insulating coating in the first container to the first end face; the coating roller is a conical roller, and an angle between a generatrix of the coating roller and a central axis of the coating roller is α, satisfying 30°≤α≤60°; the pole piece manufacturing equipment further comprises: a doctor blade arranged in the first container, the doctor blade is arranged in a spaced manner with the coating roller, and a gap between the doctor blade and the coating roller is adjustable to control the thickness of the insulating coating adhered to the coating roller.

8. The pole piece manufacturing apparatus according to claim 7, characterized by, the pole piece manufacturing equipment further comprises a driving device for driving the pole piece roll to rotate.

9. The pole piece manufacturing apparatus according to claim 7, characterized by, α=45°。 10. The pole piece manufacturing apparatus according to claim 7, characterized by the doctor blade is arranged in parallel with the roller surface of the coating roller.

11. The pole piece manufacturing apparatus according to claim 7, characterized by the pole piece manufacturing equipment further comprises: a stirring device for stirring the insulating coating in the first container.

12. The pole piece manufacturing apparatus according to claim 7, characterized by the pole piece manufacturing equipment further comprises: A circulation device comprising a second vessel, a conduit and a circulation pump, said second vessel being connected to said first vessel by said conduit, said circulation pump being for driving circulation of said insulating coating between said first vessel and said second vessel.

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