Pole piece insulation processing method and pole piece manufacturing equipment

Abstract

The application provides an electrode plate insulation processing method and an electrode plate manufacturing device. The electrode plate insulation processing method comprises the following steps: slitting an electrode plate into a plurality of sub-electrode plates; winding the sub-electrode plates to form an electrode plate roll, wherein the electrode plate roll comprises a first end face formed by the slitting edges of the sub-electrode plates; arranging the first end face to face an insulation paste; and infiltrating the insulation paste into the first end face to form an insulation layer covering at least the current collector of the sub-electrode plate and burrs generated after the current collector is cut. The electrode plate manufactured according to the technical solution provided by the application can improve the reliability of a battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a tab insulation processing 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 present application provides a tab insulation processing method and a tab manufacturing device, which can improve the reliability of the battery.

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

[0006] In a first aspect, the present application provides a tab insulation processing method, comprising: slitting a tab into a plurality of sub-tabs; winding the sub-tabs to form a tab roll, the tab roll comprising a first end face composed of slitting edges of the sub-tabs; disposing the first end face towards an insulation paste; and infiltrating the insulation paste into the first end face to form an insulation layer covering at least the current collector of the sub-tab and burrs generated after cutting the current collector.

[0007] According to the tab insulation processing method of the present application, the insulation paste is infiltrated into the slitting edges of the sub-tab, thereby forming an insulation layer on the first end face of the tab roll. The insulation layer can cover the current collector and the burrs generated after cutting the current collector, shielding the burrs and reducing the risk of internal short circuit of the battery cell caused by the burrs piercing the isolation film. The operation is simple and can improve the reliability of the battery cell.

[0008] According to some embodiments of the present application, the step of infiltrating the insulation paste into the first end face comprises: agitating the insulation paste to make the rising insulation paste infiltrate the first end face.

[0009] In the above scheme, the insulation paste is agitated to make the rising insulation paste infiltrate the first end face, thereby reducing the risk of air bubbles existing between the insulation paste and the first end face after the insulation paste infiltrates the first end face, and facilitating the improvement of the infiltration effect of the insulation paste.

[0010] According to some embodiments of the present application, before the step of agitating the insulation paste, the first end face is not in contact with the insulation paste.

[0011] In the above scheme, before the stirring of the insulating paste, the first end surface is not in contact with the insulating paste, so as to reduce the risk of the insulating paste infiltrating the jelly-roll and causing the adjacent two jelly-roll layers to be bonded.

[0012] According to some embodiments of the present application, the stirring of the insulating paste comprises: stirring the insulating paste so that the insulating paste forms waves, and a wave crest of the waves is higher than the first end surface.

[0013] In the above scheme, by stirring the insulating paste so that the insulating paste forms waves and a wave crest of the waves is higher than the first end surface, the insulating paste is infiltrated to the first end surface, and by controlling the wave crest, the amount of the insulating paste infiltrated to the jelly-roll can be adjusted.

[0014] According to some embodiments of the present application, before the stirring of the insulating paste, a distance between the first end surface and the insulating paste is H1, and after the stirring of the insulating paste, a height of the wave crest of the waves is H2, and H2-H1 satisfies 1mm≤H2-H1≤5mm.

[0015] In the above scheme, (H2-H1) can be the size of the waves exceeding the first end surface, that is, the size of the insulating paste infiltrated to the jelly-roll in the vertical direction, which can determine the thickness of the insulating layer attached to the first end surface. The wave crest height H2 and the distance H1 between the first end surface and the insulating paste satisfy the above relationship, so as to control the thickness of the insulating layer formed on the first end surface to satisfy the shielding of the burr. If the value of (H2-H1) is small (such as less than 1mm), the thickness of the insulating layer is small, and the burr is easy to pierce the insulating layer, and the insulation effect is poor. If the value of (H2-H1) is large (such as greater than 5mm), the height of the insulating paste is high, the insulating paste is easy to infiltrate between the adjacent two jelly-roll layers, and the adjacent two jelly-roll layers are easy to be bonded. When the jelly-roll is unrolled, the insulating layer is easy to be separated from the first end surface, and the insulation is failed.

[0016] According to some embodiments of the present application, 2mm≤H2-H1≤4mm.

[0017] In the above scheme, compared with H2-H1<2mm, when H2-H1≥2mm, the thickness of the insulating layer formed on the first end surface by the insulating paste is large, the insulating layer has a good shielding effect on the burr, and the insulation effect is high. Compared with H2-H1>4mm, when H2-H1≤4mm, the height of the insulating paste is low, and the insulating paste is not easy to enter between the adjacent two jelly-roll layers, so as to reduce the bonding of the adjacent two jelly-roll layers by the insulating layer while the insulating layer has a good shielding effect on the burr.

[0018] According to some embodiments of the present application, the stirring the insulating slurry comprises stirring the insulating slurry by rotating the stirring member, and an axis of rotation of the stirring member is collinear with the central axis of the pole piece web.

[0019] In the above scheme, since the insulating slurry is located below the pole piece web, if the pole piece web is rotated, the pole piece web is prone to be separated from the winding roller and fall into the insulating slurry. In the present embodiment, the pole piece web is not rotated, and the risk of the pole piece web being separated from the winding roller can be reduced.

[0020] According to some embodiments of the present application, the stirring the insulating slurry comprises stirring the insulating slurry by rotating the stirring member, and an axis of rotation of the stirring member is collinear with the central axis of the pole piece web.

[0021] In the above scheme, by rotating the stirring member and the axis of rotation of the stirring member being collinear with the central axis of the pole piece web, the insulating slurry is raised, and the raised insulating slurry can be uniformly covered on the first end surface, and the operation is convenient.

[0022] According to some embodiments of the present application, the extending direction of the stirring member intersects with the central axis of the pole piece web.

[0023] In the above scheme, the extending direction of the stirring member intersects with the central axis of the pole piece web. When the extending direction of the stirring member is parallel to the first end surface, the extending direction of the stirring member can be parallel to the radial direction of the first end surface, so that the stirring member can have a larger overlapping area with the first end surface in the radial direction of the first end surface. When the stirring member stirs the insulating slurry, the raised insulating slurry can cover the inner and outer circles of the first end surface, and the coating efficiency of the insulating slurry on the first end surface is improved.

[0024] According to some embodiments of the present application, along the extending direction of the central axis of the pole piece web, a projection of the stirring member is located on one side of the central axis of the pole piece web.

[0025] In the above scheme, the projection direction is the extending direction of the central axis of the pole piece web, and the projection of the stirring member on the plane perpendicular to the central axis of the pole piece web is located on one side of the central axis of the pole piece web. The stirring member occupies a smaller space in the radial direction of the pole piece web, and the insulating member is convenient to layout, the space occupied by the stirring member is reduced, and the risk of the stirring member interfering with the winding roller provided with the pole piece web is reduced.

[0026] According to some embodiments of the present application, along the extending direction of the central axis of the pole piece web, two ends of the projection of the stirring member in the extending direction of the stirring member exceed the inner and outer circles of the first end surface.

[0027] In the above scheme, the projection of the stirring member exceeds the inner and outer circles of the first end face along the extension direction of the stirring member, that is, the stirring member has a large overlapping area with the first end face in the radial direction of the first end face. During rotation of the stirring member, the rising insulation slurry can cover the inner and outer circles of the first end face. One rotation of the stirring member can complete one immersion of the first end face by the insulation slurry, and the immersion efficiency is high.

[0028] According to some embodiments of the present application, before the stirring of the insulation slurry by the stirring member, the stirring member is located in the insulation slurry and does not exceed the liquid surface of the insulation slurry.

[0029] In the above scheme, the stirring member does not exceed the liquid surface of the insulation slurry, which can reduce the risk of interference between the stirring member and the winding roller of the winding sub-pole piece.

[0030] According to some embodiments of the present application, after completing the immersion of the first end face of one of the pole piece coils, the stirring speed of the insulation slurry is reduced, another pole piece coil to be insulated is replaced, and the stirring of the insulation slurry is repeated.

[0031] In the above scheme, after completing the immersion of the first end face of one of the pole piece coils, the stirring speed of the insulation slurry is reduced, so that the insulation slurry tends to be stationary, thereby facilitating the replacement of the pole piece coil to be insulated, and the stirring of the insulation slurry is repeated to facilitate the immersion of the first end face by the insulation slurry, thereby reducing the risk of splashing of the insulation slurry to other areas during the replacement of the pole piece coil.

[0032] In a second aspect, the embodiments of the present application provide a pole piece manufacturing device, which comprises: a slitting device, a winding device, a container, a positioning device, and a stirring device. The slitting device is configured to slit a pole piece into a plurality of sub-pole pieces; the winding device is configured to wind the sub-pole pieces to form a pole piece coil, the pole piece coil comprising a first end face formed by slitting edges of the sub-pole pieces; the container is configured to contain insulation slurry; the positioning device is configured to position the pole piece coil; and the stirring device is configured to stir the insulation slurry in the container, so that the rising insulation slurry immerses the first end face to form an insulation layer covering at least a current collector of the sub-pole piece and burrs generated after cutting of the current collector.

[0033] According to the pole piece manufacturing device of the embodiments of the present application, the pole piece is slit into a plurality of sub-pole pieces by the slitting device, the winding device can wind the sub-pole pieces to form a pole piece coil, and the positioning device can position the pole piece coil, so that the insulation slurry stirred by the stirring device can immerse the first end face to form an insulation layer covering the current collector and the burrs generated after cutting of the current collector. The manufactured pole piece can reduce the risk of burrs piercing the isolation film to cause internal short circuit of the battery cell, and can improve the reliability of the battery cell.

[0034] According to some embodiments of the present application, the stirring device comprises a stirring member arranged in the insulating slurry and a driving member in transmission connection with the stirring member, the driving member being configured to drive the stirring member to rotate relative to the container so as to cause the insulating slurry to surge.

[0035] In the above scheme, the stirring member is driven by the driving member to cause the insulating slurry in the container to surge, so that the surged insulating slurry wets the first end surface, and then forms an insulating layer on the first end surface, which is simple in structure and convenient to operate.

[0036] According to some embodiments of the present application, the rotation axis of the stirring member is collinear with the central axis of the container.

[0037] In the above scheme, the rotation axis of the stirring member is collinear with the central axis of the container, so that the pole piece web is positioned in the container according to the rotation axis of the stirring member.

[0038] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0039] 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 considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0040] Figure 1 A flowchart of the pole piece insulation processing method provided by some embodiments of the present application is shown in the figure;

[0041] Figure 2 A schematic diagram of the pole piece slitting state provided by some embodiments of the present application is shown in the figure;

[0042] Figure 3 A schematic diagram of the first end surface provided by some embodiments of the present application is shown in the figure;

[0043] Figure 4 A schematic diagram of the pole piece web being put into the container provided by some embodiments of the present application is shown in the figure;

[0044] Figure 5 A schematic diagram of the surged insulating slurry wetting the first end surface provided by some embodiments of the present application is shown in the figure;

[0045] Figure 6 A schematic diagram of the structure of the pole piece manufacturing equipment provided by some embodiments of the present application is shown in the figure;

[0046] Figure 7 Structure schematic diagram of the pole piece manufacturing equipment provided for some embodiments of the present application.

[0047] Icon: 100 - slitting device; 1 - pole piece; 11 - sub-pole piece; 2 - pole piece coil; 21 - first end face; 200 - winding device; 20 - winding roller; 300 - container; 31 - wave; 400 - positioning device; 41 - positioning clamp; 42 - fixing frame; 500 - stirring device; 51 - stirring piece; 52 - driving piece; 53 - rotary table; 600 - detection device. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0049] 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, rather than to describe a particular order or primary and secondary relationship.

[0050] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments. 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.

[0051] 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 integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the 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.

[0052] The term "and / or" in the present application is only used to describe the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: 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.

[0053] In the present application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0054] 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.

[0055] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and a battery cell, and the battery cell or the battery module is contained in the box body.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 inserted 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 electrode and the negative electrode from short-circuiting, and at the same time, the active ions can pass through.

[0061] 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.

[0062] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either or both of the two surfaces of the positive electrode current collector.

[0063] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a 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, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0064] As an example, the positive electrode 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 electrode active material can also be used.

[0065] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0066] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed.

[0067] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either or both of the two surfaces of the negative electrode current collector.

[0068] As an example, the negative electrode active material can employ a negative electrode active material known in the art for a battery. As an example, the negative electrode 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, or 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 electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0069] In some embodiments, the separator is a separator film. The present application does not have a particular limitation on the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0070] As an example, the main material of the separation film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separation film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separation film is a multi-layer composite film, the materials of the layers can be the same or different, and are not particularly limited. The separation member can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0071] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0072] In some embodiments, the electrode assembly is a stacked structure.

[0073] In some embodiments, the battery cell can include a housing. The housing is used to package components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0074] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, discharge capacity, and charge-discharge rate. In addition, the reliability of the battery also needs to be considered.

[0075] In the battery manufacturing process, the manufacturing process of the electrode sheet includes a slitting process. The electrode sheet is usually in a continuous strip structure, and has a certain width. The electrode sheet is cut into a plurality of sub-electrode sheets through the slitting process. The cutting edge of the sub-electrode sheet forms burrs, which are generated after the current collector is cut. When the electrode sheet forms a battery cell, the burrs are easy to pierce the separation film, thereby causing internal short circuit of the battery cell, and in severe cases, causing fire, explosion, etc., which makes the reliability of the battery cell poor.

[0076] In view of this, in order to solve the problem that the burrs pierce the separation film to cause internal short circuit of the battery cell and make the reliability of the battery cell poor, the embodiments of the present application provide a technical scheme. After the electrode sheet is cut into a plurality of sub-electrode sheets, the sub-electrode sheets are wound to form an electrode sheet roll. The electrode sheet roll is placed in a container containing insulating paste. The insulating paste is infiltrated to the first end surface, and an insulating layer covering the burrs is formed on the first end surface. The manufactured electrode sheet can improve the reliability of the battery cell.

[0077] According to the technical scheme, the insulating paste is infiltrated into the first end face, that is, the insulating paste is infiltrated into all slitting edges of the sub-pole piece to form an insulating layer on the first end face, the insulating layer at least covers the current collector and burrs generated after the current collector is cut, the insulating layer covers part of the active material layer to shield the burrs, and the pole piece formed by the pole piece has a higher reliability because the burrs are less likely to pierce the isolation film due to the shielding of the insulating layer, and the risk of internal short circuit of the battery cell caused by the burrs piercing the isolation film is reduced.

[0078] The pole piece insulation processing method of the embodiments of the present application will be described below with reference to the accompanying drawings.

[0079] Please refer to Figures 1 to 5 , Figure 1 The flowchart of the pole piece insulation processing method provided by some embodiments of the present application is shown in Figure 2 The state diagram of the pole piece slitting provided by some embodiments of the present application is shown in Figure 3 The diagram of the first end face provided by some embodiments of the present application is shown in Figure 4 The diagram of the pole piece coiled into a container provided by some embodiments of the present application is shown in Figure 5 The diagram of the insulating paste infiltrating the first end face provided by some embodiments of the present application is shown in. According to some embodiments of the present application, a pole piece insulation processing method is provided, which comprises:

[0080] S110, slitting the pole piece 1 into a plurality of sub-pole pieces 11;

[0081] S120, winding the sub-pole pieces 11 to form a pole piece coiled material 2, the pole piece coiled material 2 comprising a first end face 21 formed by the slitting edges of the sub-pole pieces 11;

[0082] S130, setting the first end face 21 to face the insulating paste;

[0083] S140, infiltrating the insulating paste into the first end face 21 to form an insulating layer covering at least the current collector and burrs generated after the current collector is cut.

[0084] Slitting the pole piece 1 into a plurality of sub-pole pieces 11 can improve the manufacturing efficiency of the pole piece 1. After the pole piece 1 is slitted, two sub-pole pieces 11, three sub-pole pieces 11 or more than three sub-pole pieces 11 can be formed.

[0085] The pole piece 1 is usually in a continuous strip structure, the pole piece 1 is slitted to form the sub-pole pieces 11, the sub-pole pieces 11 are wound on the winding roller 20 to form the pole piece coiled material 2, so as to facilitate subsequent process operation.

[0086] The first end face 21 is an end face formed by the slitting edges of the sub-pole pieces 11. Please refer to Figure 3The first end surface 21 can be annular as a whole, and the first end surface 21 has an inner ring 211 and an outer ring 212, wherein the inner ring 211 is close to the winding roller 20, and the outer ring 212 is away from the winding roller 20.

[0087] In the step S130 of arranging the first end surface 21 to face the insulating paste, the positioning device can be used to position the pole piece coiled material 2, so as to fix the relative position of the pole piece coiled material 2 and the insulating paste in the container 300. In this step, the first end surface 21 is arranged to face the insulating paste, and the first end surface 21 is parallel to the liquid surface of the insulating paste in the container 300, so as to facilitate the uniform coverage of the insulating paste on the first end surface 21. In this step, the pole piece coiled material 2 can be located outside the container 300 or inside the container 300.

[0088] In the step S140 of immersing the first end surface 21 in the insulating paste, the first end surface 21 can be directly immersed in the insulating paste, or the stirring device can be used to stir the insulating paste, so that the insulating paste is raised, and the raised insulating paste can immerse the first end surface 21, so that the insulating paste forms an insulating layer on the first end surface 21, and the insulating layer at least covers the current collector and the burrs generated after the current collector is cut. In the direction perpendicular to the first end surface 21, the projection of the burr partially overlaps the active material layer, and when the first end surface 21 is immersed in the insulating paste, the insulating paste is attached to the current collector, the active material layer and the burr, so that the formed insulating layer can cover the current collector and the burr.

[0089] The insulating paste 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 and 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 and a carboxymethyl cellulose binder. The solvent is selected according to the attribute of the binder. When the binder is a water-based binder, a water-based solvent (such as distilled water) can be selected; when the binder is an oil-based binder, an oil-based solvent (such as N-methyl pyrrolidone) can be selected.

[0090] According to the pole piece insulation processing method, the insulating paste is used to immerse the slitting edge of the sub-pole piece 11, so that an insulating layer is formed on the first end surface 21 of the pole piece coiled material 2, and the insulating layer can cover the current collector and the burrs generated after the current collector is cut, so as to shield the burrs and reduce the risk of internal short circuit of the battery cell caused by the burrs piercing the isolation film. The operation is simple, and the reliability of the battery cell can be improved.

[0091] According to some embodiments of the present application, the insulating paste is used to immerse the first end surface 21, which includes stirring the insulating paste, so that the raised insulating paste immerses the first end surface 21.

[0092] In the above scheme, the insulating paste is stirred so that the raised insulating paste wets the first end surface 21, so as to reduce the risk of air bubbles existing between the insulating paste and the first end surface 21 after the insulating paste wets the first end surface 21, thereby facilitating improvement of the wetting effect of the insulating paste.

[0093] Please refer to Figure 4 According to some embodiments of the present application, the first end surface 21 is not in contact with the insulating paste before the insulating paste is stirred.

[0094] In the step "S130, the first end surface 21 is arranged to face the insulating paste", a part of the pole piece 1 is located in the container 300, and the first end surface 21 is in the container 300.

[0095] If the first end surface 21 is in contact with the insulating paste, when the insulating paste is stirred, the contact area of the insulating paste with the sub-pole piece 11 in the vertical direction is large, and the insulating paste is easy to immerse between the adjacent two circles of sub-pole pieces 11, thereby causing the adjacent two circles of sub-pole pieces 11 to be bonded, and after the insulating paste is solidified, when the sub-pole piece 11 is unfolded, the insulating layer attached to the first end surface 21 is easy to be separated from the sub-pole piece 11, losing the coverage of the burr, resulting in insulation failure.

[0096] In the above scheme, before the insulating paste is stirred, the first end surface 21 is not in contact with the insulating paste in the container 300, and after the insulating paste is stirred, the raised insulating paste is used to wet the first end surface 21, and the amount of the insulating paste attached to the first end surface 21 is controlled, so as to reduce the risk of the insulating paste wetting the pole piece coiled material 2 and causing the adjacent two circles of sub-pole pieces 11 to be bonded.

[0097] According to some embodiments of the present application, in the step "S130, the first end surface 21 is arranged to face the insulating paste", the pole piece coiled material 2 can be positioned by a positioning device to determine the distance between the first end surface 21 and the liquid surface of the insulating paste. For example, the pole piece coiled material 2 can be hung above the insulating paste by the positioning device, so that the first end surface 21 is not in contact with the liquid surface of the insulating paste.

[0098] In some embodiments, the distance between the first end surface 21 and the liquid surface of the insulating paste is adjusted before the insulating paste is stirred, so as to satisfy that the raised insulating paste can wet the first end surface 21.

[0099] Please refer to Figure 5 According to some embodiments of the present application, the insulating paste is stirred, including: stirring the insulating paste so that the insulating paste forms waves 31, and the wave crests of the waves 31 are higher than the first end surface 21.

[0100] When the insulating slurry is stirred, the insulating slurry forms waves 31, and the crests of the waves 31 are higher than the first end surface 21, so that the waves 31 can cover the first end surface 21, to facilitate the insulating slurry to soak the first end surface 21 and form an insulating layer on the first end surface 21.

[0101] When the insulating slurry is stirred, the waves 31 can cover the entire first end surface 21, to facilitate the insulating slurry to cover uniformly on the first end surface 21.

[0102] In some embodiments, the insulating slurry can be stirred by a stirring member, and the length of the stirring member can be greater than or equal to the distance between the inner circle and the outer circle of the first end surface 21, so that the formed waves 31 cover the inner circle and the outer circle of the first end surface 21.

[0103] In the above scheme, by stirring the insulating slurry, the insulating slurry forms waves 31, and the crests of the waves 31 are higher than the first end surface 21, to achieve the insulating slurry to soak the first end surface 21, and by controlling the crests of the waves 31, the soaking amount of the insulating slurry on the pole piece web 2 can be adjusted.

[0104] Please refer to Figure 4 and Figure 5 According to some embodiments of the present application, the distance between the first end surface 21 and the insulating slurry before stirring the insulating slurry is H1, and the height of the crests of the waves 31 after stirring the insulating slurry to form the waves 31 is H2, which satisfies 1mm≤H2-H1≤5mm.

[0105] The distance between the first end surface 21 and the insulating slurry before stirring the insulating slurry can be measured by a distance measuring instrument. For example, a distance measuring instrument is arranged on a positioning device clamping the pole piece web 2, and the distance between the distance measuring instrument and the first end surface 21 is preset, and after the pole piece web 2 is positioned in the container 300, the distance between the first end surface 21 and the insulating slurry is detected.

[0106] The height of the crests of the waves 31 can be the distance between the highest point of the waves 31 and the liquid surface of the insulating slurry when it is still, which can be measured by a detection device (such as a distance measuring instrument). For example, after the insulating slurry is stirred, the distance measuring instrument detects the distance between the highest point of the insulating slurry and the distance measuring instrument, and the height of the crests of the waves 31 is obtained by comparing the distance between the distance measuring instrument and the insulating slurry when it is still.

[0107] (H2-H1) can be the size of the waves 31 exceeding the first end surface 21, that is, the size of the insulating slurry soaking the sub-pole piece 11 in the vertical direction, which can determine the thickness of the insulating layer attached to the first end surface 21.

[0108] If the value of (H2-H1) is small (e.g., less than 1 mm), the thickness of the insulation layer is thin, the burr is easy to pierce the insulation layer, and the insulation effect is poor; if the value of (H2-H1) is large (e.g., greater than 5 mm), the height of the insulation paste is high, the insulation paste is easy to immerse between the adjacent two layers of the sub-pole piece 11, and the adjacent two layers of the sub-pole piece 11 are easy to be bonded, which will cause the insulation layer to be separated from the first end surface 21 when the pole piece coiled material 2 is unfolded, resulting in insulation failure.

[0109] The peak height H2 and the distance H1 between the first end surface 21 and the insulation paste satisfy the above relationship (1 mm≤H2-H1≤5 mm), which can control the thickness of the insulation layer formed on the first end surface 21 to meet the shielding of the burr.

[0110] According to some embodiments of the present application, 2 mm≤H2-H1≤4 mm.

[0111] Compared with H2-H1<2 mm, when H2-H1≥2 mm, the thickness of the insulation layer formed by the insulation paste on the first end surface 21 is thick, the insulation layer has a good shielding effect on the burr, and the insulation effect is high.

[0112] Compared with H2-H1>4 mm, when H2-H1≤4 mm, the height of the insulation paste is low, and the insulation paste is not easy to enter between the adjacent two layers of the sub-pole piece 11, which reduces the bonding of the adjacent two layers of the sub-pole piece 11 by the insulation layer while having a good shielding effect on the burr.

[0113] According to some embodiments of the present application, the pole piece coiled material 2 does not rotate when the insulation paste is stirred.

[0114] Since the insulation paste is located below the pole piece coiled material 2, if the pole piece coiled material 2 is rotated, the pole piece coiled material 2 is easy to be separated from the winding roller 20 and fall into the insulation paste. In the present embodiment, the pole piece coiled material 2 does not rotate, which can reduce the risk of the pole piece coiled material 2 being separated from the winding roller 20.

[0115] According to some embodiments of the present application, stirring the insulation paste comprises: stirring the insulation paste by rotating the stirring piece 51, and the rotation axis of the stirring piece 51 is collinear with the central axis P of the pole piece coiled material 2.

[0116] When the insulation paste is stirred by rotating the stirring piece 51, the rotation speed of the stirring piece 51 affects the peak height of the wave 31, the faster the rotation speed of the stirring piece 51, the higher the peak height of the wave 31; on the contrary, the slower the rotation speed of the stirring piece 51, the lower the peak height of the wave 31.

[0117] By rotating the stirring member 51, the insulating paste can be stirred so that the insulating paste is raised, and the raised insulating paste forms waves 31 that move along the moving track of the stirring member 51. The central axis P of the pole piece web 2 is collinear with the central axis of the first end face 21, the rotating axis of the stirring member 51 is collinear with the central axis P of the pole piece web 2, and the moving track of the stirring member 51 can be a circle around the central axis P of the pole piece web 2. When the waves 31 formed by the insulating paste move along the moving track of the stirring member 51, the insulating paste can cover the first end face 21 in the circumferential direction of the first end face 21, so as to realize the impregnation of the insulating paste on the first end face 21.

[0118] In some embodiments, the stirring member 51 can be a plate-shaped structure, so that the stirring member 51 can carry more insulating paste, so as to facilitate the impregnation of the raised insulating paste on the first end face 21.

[0119] In the above scheme, by rotating the stirring member 51 and the rotating axis of the stirring member 51 being collinear with the central axis P of the pole piece web 2, the raised insulating paste can be uniformly covered on the first end face 21, and the operation is convenient.

[0120] According to some embodiments of the present application, the extending direction of the stirring member 51 intersects with the central axis P of the pole piece web 2.

[0121] The stirring member 51 can be parallel to the first end face 21, so that the stirring member 51 stirs the waves 31 formed by the insulating paste to cover the inner and outer circles of the first end face 21, and the insulating paste can be uniformly attached on the first end face 21, that is, the thickness of the insulating layer on the first end face 21 can be uniform.

[0122] In the above scheme, the extending direction of the stirring member 51 intersects with the central axis P of the pole piece web 2, and when the extending direction of the stirring member 51 is parallel to the first end face 21, the extending direction of the stirring member 51 can be parallel to the radial direction of the first end face 21, so that the stirring member 51 can have a larger overlapping area with the first end face 21 in the radial direction of the first end face 21, so as to facilitate the stirring of the insulating paste by the stirring member 51, and the raised insulating paste can cover the inner and outer circles of the first end face 21, and the coating efficiency of the insulating paste on the first end face 21 is improved.

[0123] Please refer to Figure 5 According to some embodiments of the present application, in the extending direction of the central axis P of the pole piece web 2, the projection of the stirring member 51 is located on one side of the central axis P of the pole piece web 2.

[0124] The projection of the stirring member 51 on a plane perpendicular to the central axis P of the pole piece web 2 is located on one side of the central axis P of the pole piece web 2, that is, the stirring member 51 does not exceed the central axis P of the pole piece web 2.

[0125] In the above scheme, the projection of the stirring member 51 is located on one side of the central axis P of the pole piece web 2, and the stirring member 51 occupies a smaller space in the radial direction of the pole piece web 2, facilitating the layout of the insulating member and reducing the space occupied by the stirring member 51 and the risk of interference between the stirring member 51 and the winding roller 20 provided for the pole piece web 2.

[0126] According to some embodiments of the present application, along the extension direction of the central axis P of the pole piece web 2, the two ends of the projection of the stirring member 51 in the extension direction of the stirring member 51 exceed the inner and outer circles of the first end face 21.

[0127] The first end face 21 can be regarded as an annular face, and the first end face 21 has an inner circle and an outer circle, the inner circle is close to the winding roller 20 of the sub-pole piece 11, and the outer circle is away from the winding roller 20 of the sub-pole piece 11.

[0128] The stirring member 51 can be a plate-shaped structure, and the stirring member 51 can be a cuboid, and the extension direction of the stirring member 51 can be the length direction of the stirring member 51. The two ends of the projection of the stirring member 51 in the extension direction of the stirring member 51 exceed the inner and outer circles of the first end face 21, which can be that the two ends of the stirring member 51 in the length direction thereof exceed the inner and outer circles of the first end face 21.

[0129] For example, in the embodiments in which the projection of the stirring member 51 on the central axis P of the pole piece web 2 is located on one side of the central axis P of the pole piece web 2 along the extension direction of the central axis P of the pole piece web 2, the stirring member 51 is located on one side of the central axis P of the pole piece web 2, and the two ends of the projection of the stirring member 51 in the extension direction of the stirring member 51 exceed the inner and outer circles of the first end face 21, so that the stirring member 51 can cover the inner and outer circles of the first end face 21, and when the stirring member 51 stirs the insulating paste, the waves 31 formed by the insulating paste can cover the inner and outer circles of the first end face 21.

[0130] For another example, in some embodiments, the projection of the stirring member 51 can be located on both sides of the central axis P of the pole piece web 2 along the extension direction of the central axis P of the pole piece web 2, and the two ends of the projection of the stirring member 51 in the extension direction of the stirring member 51 can also exceed the inner and outer circles of the first end face 21, and at this time, the length of the stirring member 51 can be greater than or equal to the diameter of the pole piece web 2.

[0131] In the above scheme, the projection of the stirring member 51 has two ends along the extension direction of the stirring member 51 beyond the inner circle and the outer circle of the first end face 21, that is, the stirring member 51 has a large overlapping area with the first end face 21 in the radial direction of the first end face 21. During rotation of the stirring member 51, the rising insulation slurry can cover the inner circle and the outer circle of the first end face 21, and one rotation of the stirring member 51 can complete the immersion of the insulation slurry to the first end face 21, so the immersion efficiency is high.

[0132] According to some embodiments of the present application, along the central axis P of the pole piece web 2, the projection of the stirring member 51 extends from the outer circle to the inner circle of the first end face 21.

[0133] For example, the extension length of the stirring member 51 is equal to the distance between the outer circle and the inner circle of the first end face 21, and along the central axis P of the pole piece web 2, the projection of the stirring member 51 overlaps the first end face 21 in the plane perpendicular to the central axis P of the pole piece web 2.

[0134] In the above scheme, the stirring member 51 has a large overlapping area with the first end face 21 along the central axis P of the pole piece web 2, and the wave 31 formed by the stirring member 51 can cover the inner circle and the outer circle of the first end face 21, so as to facilitate the insulation slurry to immerse the inner circle and the outer circle of the first end face 21, and improve the immersion efficiency.

[0135] Please refer to Figure 4 According to some embodiments of the present application, before the stirring member 51 stirs the insulation slurry by rotating, the stirring member 51 is located in the insulation slurry and does not exceed the liquid surface of the insulation slurry.

[0136] The stirring member 51 is located in the insulation slurry, so that the stirring member 51 drives the insulation slurry to splash, so that the insulation slurry rises to form the wave 31.

[0137] The stirring member 51 does not exceed the liquid surface of the insulation slurry, which can be that the stirring member 51 is flush with the liquid surface of the insulation slurry, or the stirring member 51 is lower than the liquid surface of the insulation slurry.

[0138] When the sub-pole piece 11 is wound on the winding roller 20 to form the pole piece web 2, one end of the winding roller 20 protrudes from the first end face 21, so that the winding roller 20 has a good supporting effect on the sub-pole piece 11. If the stirring member 51 exceeds the liquid surface of the insulation slurry, the stirring member 51 is easy to interfere with the winding roller 20 of the sub-pole piece 11.

[0139] In the above scheme, the stirring member 51 does not exceed the liquid surface of the insulation slurry, which can reduce the risk of interference between the stirring member 51 and the winding roller 20 of the sub-pole piece 11.

[0140] According to some embodiments of the present application, before the insulating slurry is agitated by rotating the stirring member 51, the stirring member 51 can also exceed the liquid level of the insulating slurry, at which time the stirring member 51 needs to avoid the winding roller 20 winding the sub-pole piece 11.

[0141] In the above embodiments, when the stirring member 51 agitates the insulating slurry, the stirring member 51 rotates parallel to the first end surface 21, that is, the stirring member 51 rotates along the circumferential direction of the pole piece web 2, so as to cover the insulating slurry on the entire area of the first end surface 21.

[0142] According to some embodiments of the present application, after completing the impregnation of the first end surface 21 of one pole piece web 2, the stirring speed of the insulating slurry is reduced, a pole piece web 2 to be insulated is replaced, and the insulating slurry is agitated repeatedly.

[0143] After completing the impregnation of the first end surface 21 of one pole piece web 2, the stirring speed of the insulating slurry is reduced, so that the insulating slurry tends to be stationary, the rising height of the insulating slurry is reduced, so as to replace the pole piece web 2 to be insulated, and reduce the risk of the insulating slurry splashing to other areas when the pole piece web 2 is replaced. After replacing the pole piece web 2 which is not impregnated with the insulating slurry, the insulating slurry is agitated repeatedly, so as to impregnate the first end surface 21 with the insulating slurry, and improve the efficiency of the pole piece insulation process.

[0144] Please refer to Figure 6 , Figure 6 The structure schematic block diagram of the pole piece manufacturing equipment provided by some embodiments of the present application is shown in FIG. 1. Figure 7 The structure schematic diagram of the pole piece manufacturing equipment provided by some embodiments of the present application is shown in FIG. 1. According to some embodiments of the present application, the pole piece manufacturing equipment provided by the embodiments of the present application can be used for the pole piece insulation process provided by any of the above embodiments. The pole piece manufacturing equipment includes a slitting device 100, a winding device 200, a container 300, a positioning device 400, and a stirring device 500. The slitting device 100 is used to slit the pole piece 1 into a plurality of sub-pole pieces 11; the winding device 200 is used to wind the sub-pole pieces 11 to form a pole piece web 2, the pole piece web 2 includes a first end surface 21 formed by the slitting edges of the sub-pole pieces 11; the container 300 is used to contain the insulating slurry; the positioning device 400 is used to position the pole piece web 2; and the stirring device 500 is used to agitate the insulating slurry in the container 300, so that the rising insulating slurry impregnates the first end surface 21, 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.

[0145] The slitting device 100 is a device for slitting the pole piece 1 into a plurality of sub-pole pieces 11. The pole piece 1 can be a pole piece 1 raw material, and the sub-pole piece 11 can be a pole piece 1 constituting a battery cell. The specific structure and working principle of the slitting device 100 can refer to the existing slitting device 100, and the present application will not be described in detail.

[0146] After the pole piece 1 is slitted into a plurality of sub-pole pieces 11 and the sub-pole pieces 11 are wound to form the pole piece roll 2, the slitting edge on one side of the sub-pole piece 11 constitutes the first end face 21. Along the extension direction of the central axis P of the pole piece roll 2, the first end face 21 as a whole can be regarded as an annular surface, and the first end face 21 has an inner ring and an outer ring. The inner ring is close to the central axis P of the pole piece roll 2, and the outer ring is away from the central axis P of the pole piece roll 2.

[0147] The winding device 200 is a device for winding the sub-pole piece 11. The winding device 200 can include a winding driving member and a winding roller 20. The winding roller 20 is in transmission connection with the winding driving member, and the winding driving member can drive the winding roller 20 to rotate to wind the sub-pole piece 11 on the winding roller 20. When the sub-pole piece 11 is wound to form the pole piece roll 2, the winding roller 20 can move synchronously with the pole piece roll 2 when the pole piece roll 2 moves between different processes.

[0148] One end of the container 300 is open to allow the pole piece roll 2 to extend in.

[0149] The positioning device 400 is a device for positioning the pole piece roll 2.

[0150] In some embodiments, referring to Figure 7 , the positioning device 400 can include a positioning clamp 41 for clamping the pole piece roll 2 and a fixing frame 42. The fixing frame 42 can be connected to the container 300 or other components (such as the factory foundation) to facilitate the positioning of the pole piece roll 2. In other embodiments, the positioning device 400 can also include a mechanical hand to achieve the positioning of the pole piece roll 2. When the pole piece roll 2 moves to the working position of the insulating paste, the relative position between the pole piece roll 2 and the container 300 is adjusted by the positioning device 400. For example, the pole piece roll 2 can be positioned outside the container 300, or the pole piece roll 2 can be positioned inside the container 300.

[0151] The stirring device 500 is a device for stirring the insulating paste. The stirring device 500 works to make the insulating paste in the container 300 splash, so that the insulating paste surges and waves 31 are generated in the container 300 to make the surged insulating paste soak the first end face 21.

[0152] According to the pole piece manufacturing device, the pole piece 1 is cut into a plurality of sub-pole pieces 11 by the cutting device 100, the winding device 200 can wind the sub-pole pieces 11 to form a pole piece roll 2, and the positioning device 400 can position the pole piece roll 2, so that the insulating slurry agitated by the agitating device 500 can soak the first end surface 21, and an insulating layer covering the current collector and burrs generated after the current collector is cut is formed on the first end surface 21. The manufactured pole piece 1 can reduce the risk of burrs piercing the isolation film to cause internal short circuit of the battery monomer, and can improve the reliability of the battery monomer.

[0153] Please refer to Figure 7 According to some embodiments of the present application, the agitating device 500 comprises an agitating member 51 and a driving member 52, the agitating member 51 is arranged in the insulating slurry, and the driving member 52 is in transmission connection with the agitating member 51, and the driving member 52 is used to drive the agitating member 51 to rotate relative to the container 300 to surge the insulating slurry.

[0154] The driving member 52 is a component for driving the agitating member 51 to rotate, which provides rotating power for the agitating member 51. The faster the driving member 52 drives the agitating member 51 to rotate, the higher the wave peak height of the wave 31 formed by the agitating member 51 agitating the insulating slurry.

[0155] The agitating member 51 can be in a plate structure. The agitating member 51 can be located in the insulating slurry and does not exceed the liquid level of the insulating slurry.

[0156] In some embodiments, the agitating device 500 further comprises a rotating table 53, the agitating member 51 is connected to the rotating table 53, and the rotating table 53 is in transmission connection with the output end of the driving member 52. The driving member 52 can be a motor, and the output shaft of the motor can be connected with the rotating table 53. The rotating table 53 is driven to rotate by the motor to drive the agitating member 51 to rotate relative to the container 300, and then the insulating slurry is agitated.

[0157] In some embodiments, the pole piece manufacturing device can further comprise a controller and a detection device 600, the controller is electrically connected with the driving member 52 and the detection device 600, the detection device 600 is used to detect the wave peak height of the wave 31 formed by the insulating slurry, and the controller is used to control the driving member 52 to adjust the rotating speed of the agitating member 51 according to the wave peak height detected by the detection device 600.

[0158] The controller can be a PLC (Programmable Logic Controller), and the detection device 600 can include, but is not limited to, a laser range finder and a CCD (Charge-coupled Device).

[0159] In the above scheme, the stirring member 51 can cause the insulating slurry in the container 300 to surge under the driving of the driving member 52, so that the surged insulating slurry wets the first end surface 21, and further forms an insulating layer on the first end surface 21, which is simple in structure and convenient to operate.

[0160] According to some embodiments of the present application, the rotation axis of the stirring member 51 is collinear with the central axis of the container 300.

[0161] The rotation axis of the stirring member 51 can be collinear with the central axis P of the pole piece coiled material 2, so that the surged insulating slurry can cover the inner and outer circles of the first end surface 21 when the stirring member 51 rotates.

[0162] The rotation axis of the stirring member 51 is collinear with the central axis of the container 300, so as to facilitate the positioning of the pole piece coiled material 2 in the container 300 according to the rotation axis of the stirring member 51.

[0163] When the pole piece coiled material 2 is placed in the container 300, the rotation axis of the stirring member 51 can be collinear with the central axis P of the pole piece coiled material 2, and the stirring member 51 can be located on one side of the central axis P of the pole piece coiled material 2.

[0164] According to some embodiments of the present application, the inner profile of the container 300 can be circular to match the pole piece coiled material 2.

[0165] According to some embodiments of the present application, the present application provides a pole piece insulation processing method, which comprises:

[0166] As shown in Figure 2 , the pole piece 1 is cut into a plurality of sub-pole pieces 11;

[0167] The sub-pole pieces 11 are wound to form a pole piece coiled material 2, and the pole piece coiled material 2 comprises a first end surface 21 formed by the cut edges of the sub-pole pieces 11;

[0168] As shown in Figure 4 , the pole piece coiled material 2 is placed in a container 300 containing insulating slurry, the first end surface 21 faces the insulating slurry, the first end surface 21 is parallel to the liquid surface of the insulating slurry, and the first end surface 21 does not contact the insulating slurry;

[0169] As shown in Figure 5 and Figure 7 , the insulating slurry is stirred by rotating the stirring member 51, so that the insulating slurry forms waves 31, the wave crests of the waves 31 are higher than the first end surface 21, so that the surged insulating slurry wets the first end surface 21, 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.

[0170] The rotation axis of the stirring member 51 is collinear with the central axis of the pole piece coiled material 2, the extension direction of the stirring member 51 passes through the central axis P of the pole piece coiled material 2, the stirring member 51 is located on one side of the central axis P of the pole piece coiled material 2, and the two ends of the stirring member 51 along the extension direction of the stirring member 51 exceed the inner and outer circles of the first end surface 21.

[0171] The pole piece 1 manufactured according to the technical scheme of the present application can form an insulating layer on the slitting edge, the insulating layer can cover burrs, when manufactured into a battery monomer, the risk of burrs piercing the isolation film to cause internal short circuit of the battery monomer can be reduced, so that the battery monomer can have higher reliability.

[0172] 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 for insulating electrode sheets, characterized in that, include: The electrode sheet is cut into multiple sub-electrodes; The sub-electrode is wound up to form an electrode roll, the electrode roll including a first end face formed by the slit edges of the sub-electrode; The first end face is positioned facing the insulating slurry; The insulating slurry is used to wet the first end face to form an insulating layer that at least covers the current collector of the sub-electrode and the burrs generated after the current collector is cut. The step of wetting the first end face with the insulating paste includes: The insulating slurry is stirred so that the surging insulating slurry wets the first end face; Before the insulating slurry is stirred, the first end face is not in contact with the insulating slurry. The stirring of the insulating slurry includes: The insulating slurry is stirred to form waves, the crests of which are higher than the first end face.

2. The electrode insulation treatment method according to claim 1, characterized in that, Before the insulating slurry is stirred, the distance between the first end face and the insulating slurry is H1. After the insulating slurry is stirred and the wave is formed, the wave crest height is H2, which satisfies 1mm≤H2-H1≤5mm.

3. The electrode insulation treatment method according to claim 2, characterized in that, 2mm≤H2-H1≤4mm.

4. The electrode insulation treatment method according to claim 1, characterized in that, When the insulating slurry is stirred, the electrode roll does not rotate.

5. The electrode insulation treatment method according to claim 1, characterized in that, The stirring of the insulating slurry includes: The insulating slurry is agitated by rotating an agitator, the axis of rotation of which is collinear with the central axis of the electrode roll.

6. The electrode insulation treatment method according to claim 5, characterized in that, The extension direction of the agitator intersects the central axis of the electrode roll.

7. The electrode insulation treatment method according to claim 6, characterized in that, Along the extension direction of the central axis of the electrode roll, the projection of the agitator is located on one side of the central axis of the electrode roll.

8. The electrode insulation treatment method according to claim 6 or 7, characterized in that, Along the extension direction of the central axis of the electrode roll, the projection of the agitator extends beyond the inner and outer rings of the first end face at both ends along the extension direction of the agitator.

9. The electrode insulation treatment method according to claim 5, characterized in that, Before agitating the insulating slurry by rotating the agitator, the agitator is located within the insulating slurry and does not exceed the surface of the insulating slurry.

10. The electrode insulation treatment method according to claim 1, characterized in that, After the first end face of one of the electrode rolls is impregnated, the stirring speed of the insulating slurry is reduced, another electrode roll to be insulated is replaced, and the stirring of the insulating slurry is repeated.

11. An electrode manufacturing apparatus for performing the electrode insulation treatment method according to any one of claims 1-10, characterized in that, include: A slitting device is used to slit the electrode sheet into multiple sub-electrodes; A winding device for winding the sub-electrode to form an electrode roll, the electrode roll including a first end face formed by the slit edges of the sub-electrode; Containers used to hold insulating paste; Positioning device for positioning the electrode roll; A stirring device is used to agitate the insulating slurry in the container so that the surging insulating slurry wets the first end face to form an insulating layer that at least covers the current collector of the sub-electrode and the burrs generated after the current collector is cut.

12. The electrode manufacturing equipment according to claim 11, characterized in that, The agitation device includes an agitator and a driving component. The agitator is disposed within the insulating slurry, and the driving component is pulverizedly connected to the agitator. The driving component is used to drive the agitator to rotate relative to the container, thereby agitating the insulating slurry.

13. The electrode manufacturing equipment according to claim 12, characterized in that, The rotation axis of the agitator is collinear with the central axis of the container.

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