Electrode sheet manufacturing device and electrode sheet manufacturing method

Abstract

Provided are an electrode sheet manufacturing device and an electrode sheet manufacturing method, relating to the field of batteries. The electrode sheet manufacturing device comprises a first extrusion mechanism, a second extrusion mechanism, a membrane forming mechanism, and a compounding mechanism. The first extrusion mechanism is used for extruding a material and a slurry into a bulk material. The second extrusion mechanism is disposed downstream of the first extrusion mechanism and is used for extruding the bulk material into a blank material. The membrane forming mechanism is disposed downstream of the second extrusion mechanism and is used for thinning the blank material into a membrane. The compounding mechanism is disposed downstream of the membrane forming mechanism and is used for compounding the membrane and a base material to form an electrode sheet. According to the electrode sheet manufacturing device, a material and a slurry are extruded into a bulk material by means of the first extrusion mechanism, and the material and the slurry can be mixed uniformly. The electrode sheet manufacturing device is used to manufacture an electrode sheet, the uniformity of an active substance layer is good, the performance of the electrode sheet is excellent, and manufacturing efficiency is high.

Description

Pole piece manufacturing device and pole piece manufacturing method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application entitled “Pole piece manufacturing device and pole piece manufacturing method” filed on July 21, 2023 (application number: 2023109052689), the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and more specifically, to a pole piece manufacturing device and a pole piece manufacturing method. Background Art

[0004] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. Batteries include electrode assemblies, which are the components within the battery where electrochemical reactions occur. Electrode assemblies are primarily composed of wound or stacked positive and negative electrode sheets.

[0005] Currently, the manufacturing of pole pieces is mainly divided into wet technology and dry technology. However, the performance of pole pieces manufactured by dry technology is often poor.

[0006] Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide a pole piece manufacturing device and a pole piece manufacturing method, which are intended to improve the problem that the performance of pole pieces manufactured by dry technology in related technologies is often poor.

[0008] In the first aspect, an embodiment of the present application provides a pole piece manufacturing device, which includes a first extrusion mechanism, a second extrusion mechanism, a film forming mechanism and a compounding mechanism, wherein the first extrusion mechanism is used to extrude the material and slurry into a lump material; the second extrusion mechanism is arranged downstream of the first extrusion mechanism, and the second extrusion mechanism is used to extrude the lump material into a blank material; the film forming mechanism is arranged downstream of the second extrusion mechanism, and the film forming mechanism is used to thin the blank material into a membrane; the compounding mechanism is arranged downstream of the film forming mechanism, and the compounding mechanism is used to compound the membrane and the substrate to form a pole piece.

[0009] In the above technical solution, the electrode manufacturing device extrudes the material and slurry into a lump through the first extrusion mechanism, and the material and slurry can be mixed more evenly. The lump is extruded into a blank through the second extrusion mechanism. Compared with directly extruding the material and slurry into a blank, first the material and slurry are extruded into a lump through the first extrusion mechanism, and then the lump is extruded into a blank. On the one hand, the mixing of the material and the slurry will be more uniform. On the other hand, the extrusion resistance is relatively small, the extrusion speed is fast, and the quality of the extruded blank is higher. The blank is formed into a membrane through the membrane forming mechanism. In this process, the slurry plays a role similar to a "lubricant", which can promote the sliding of material particles, so that the thinned membrane has good lateral consistency, which is conducive to controlling the thickness and uniformity of the formed membrane. When the electrode manufacturing device is used to manufacture the electrode, the active material layer has good uniformity, the electrode performance is excellent, and the manufacturing efficiency is high.

[0010] As an optional technical solution of an embodiment of the present application, the first extrusion mechanism includes a barrel, a first screw and a second screw, the barrel has a feed channel, and the feed channel has an outlet; the first screw and the second screw are rotatably arranged in the feed channel, and the first screw and the second screw are used to cooperate in extruding the material and the slurry, and transporting the material and the slurry to the outlet to form the agglomerated material.

[0011] In the above technical solution, when the first and second screws rotate, the screw fins on the first and second screws shear the material and slurry, thereby uniformly mixing the material and slurry. Simultaneously, the screw fins on the first and second screws also transport the material and slurry, causing them to move toward the outlet and be squeezed near the outlet to form a mass.

[0012] As an optional technical solution of an embodiment of the present application, the first screw includes a first mixing unit, a first conveying unit and a first pressure-building unit. Along the conveying direction of the feed channel, the first conveying unit is located downstream of the first mixing unit, and the first pressure-building unit is located downstream of the first conveying unit; the second screw includes a second mixing unit, a second conveying unit and a second pressure-building unit. Along the conveying direction of the feed channel, the second conveying unit is located downstream of the second mixing unit, and the second pressure-building unit is located downstream of the second conveying unit; the first mixing unit and the second mixing unit are used to disperse and knead the material and the slurry; the first conveying unit and the second conveying unit are used to convey the material and the slurry kneaded by the first mixing unit and the second mixing unit; the first pressure-building unit and the second pressure-building unit are used to extrude the material and the slurry to form the agglomerate.

[0013] In the above technical solution, the first and second screws are respectively equipped with a first and second mixing unit, which can cooperate to disperse and knead the material and slurry, thereby uniformly mixing the material and slurry. The first and second conveying units can convey the material and slurry kneaded by the first and second mixing units. The first and second pressure-building units can compress the material and slurry, expelling air from the materials, making them denser and more uniform, thereby forming the material and slurry into agglomerates.

[0014] As an optional technical solution of an embodiment of the present application, the first mixing unit includes a first ridge and a first recess, and the first ridge and the first recess are alternately arranged along the circumference of the first screw; the second mixing unit includes a second ridge and a second recess, and the second ridge and the second recess are alternately arranged along the circumference of the second screw; when the first ridge is engaged with the second recess, the second ridge is disengaged from the first recess; when the second ridge is engaged with the first recess, the first ridge is disengaged from the second recess.

[0015] In the above technical solution, the first ridge can cooperate with the second recess, and the second ridge can cooperate with the first recess. As the first mixing unit and the second mixing unit rotate, the material and slurry are first sheared and broken up, and then squeezed and kneaded, so that the material and slurry can be fully mixed. In this way, the subsequent formed diaphragm has good uniformity, and the electrode performance is excellent.

[0016] As an optional technical solution of an embodiment of the present application, the first mixing unit includes a plurality of first ridges, and the plurality of first ridges are arranged at intervals along the circumference of the first screw; the second mixing unit includes a plurality of second ridges, and the plurality of second ridges are arranged at intervals along the circumference of the second screw, and the number of the first ridges is the same as the number of the second ridges.

[0017] In the above technical solution, by providing multiple first ridges and multiple second ridges, each first ridge cooperates with the corresponding second recess, and each second ridge cooperates with the corresponding first recess, the shearing, dispersion, extrusion and kneading of the material and slurry will be more sufficient.

[0018] As an optional technical solution of an embodiment of the present application, both the first ridge and the second ridge extend along a spiral trajectory, and the rotation direction of the first ridge is opposite to that of the second ridge.

[0019] In the above technical solution, by making the rotation direction of the first convex ridge and the rotation direction of the second convex ridge opposite to each other, it is beneficial to disperse and knead the material and the slurry.

[0020] As an optional technical solution of an embodiment of the present application, the first screw includes a plurality of the first mixing units, the plurality of the first mixing units are arranged along the conveying direction of the feed channel, and two adjacent first mixing units are connected by a third conveying unit; the second screw includes a plurality of the second mixing units, the plurality of the second mixing units are arranged along the conveying direction of the feed channel, and two adjacent second mixing units are connected by a fourth conveying unit; the fourth conveying unit and the third conveying unit correspond one to one.

[0021] In the above technical solution, by providing multiple first and second mixing units, the material and slurry are dispersed and kneaded multiple times, so that the material and slurry can be fully and evenly mixed. The third and fourth conveying units can convey the material and slurry kneaded by the previous set of first and second mixing units to the next set of first and second mixing units.

[0022] As an optional technical solution of an embodiment of the present application, the first conveying unit includes multiple first spiral segments, and the leads of at least two of the first spiral segments are unequal; the second conveying unit includes multiple second spiral segments, and the leads of at least two of the second spiral segments are unequal.

[0023] In the above technical solution, the first conveying unit and the second conveying unit are mainly used to convey materials and slurries. If the lead of the first spiral segment and the second spiral segment is small, the conveying capacity of the material and slurry is weak, and the pressure-building capacity of the material and slurry is strong. If the lead of the first spiral segment and the second spiral segment is large, the conveying capacity of the material and slurry is strong, and the pressure-building capacity of the material and slurry is weak. By selecting the first spiral segment and the second spiral segment with different leads as needed, it is possible to ensure the conveying capacity of the material and slurry, and to extrude the material and slurry during the conveying process, thereby facilitating the subsequent first pressure-building unit and the second pressure-building unit to knead the material and slurry into a lump.

[0024] As an optional technical solution of an embodiment of the present application, the first pressure-building unit is the spiral segment with the smallest lead on the first screw; and / or the second pressure-building unit is the spiral segment with the smallest lead on the second screw.

[0025] In the above technical solution, the first pressure building unit and the second pressure building unit are the spiral sections with the smallest lead on the first screw and the second screw respectively, and their pressure building capacity is the largest, which can conveniently extrude the material and slurry into agglomerates.

[0026] As an optional technical solution of an embodiment of the present application, the first screw includes a third pressure-building unit, and the third pressure-building unit is located upstream of the first mixing unit along the conveying direction of the feed channel; the second screw includes a fourth pressure-building unit, and the fourth pressure-building unit is located upstream of the second mixing unit along the conveying direction of the feed channel; the third pressure-building unit and the fourth pressure-building unit are used to pre-knead the material and the slurry.

[0027] In the above technical solution, by providing the third pressure building unit and the fourth pressure building unit, the material and the slurry are pre-kneaded, which is conducive to uniform mixing of the material and the slurry.

[0028] As an optional technical solution of an embodiment of the present application, the first screw also includes a fifth conveying unit, which is located downstream of the third pressure building unit and upstream of the first mixing unit along the conveying direction of the feed channel; the second screw also includes a sixth conveying unit, which is located downstream of the fourth pressure building unit and upstream of the second mixing unit along the conveying direction of the feed channel.

[0029] In the above technical solution, by setting up the fifth conveying unit and the sixth conveying unit, the material and slurry pre-kneaded by the third pressure building unit and the fourth pressure building unit are conveyed to the first mixing unit and the second mixing unit, and are dispersed and kneaded again in the first mixing unit and the second mixing unit, so that the material and slurry are mixed more evenly.

[0030] As an optional technical solution of an embodiment of the present application, the fifth conveying unit includes multiple third spiral segments, and the leads of at least two of the third spiral segments are unequal; and / or the sixth conveying unit includes multiple fourth spiral segments, and the leads of at least two of the fourth spiral segments are unequal.

[0031] In the above technical solution, the fifth conveying unit and the sixth conveying unit are mainly used to convey materials and slurries. If the lead of the third spiral segment and the fourth spiral segment is small, the conveying capacity of the material and slurry is weak, and the pressure-building capacity of the material and slurry is strong. If the lead of the third spiral segment and the fourth spiral segment is large, the conveying capacity of the material and slurry is strong, and the pressure-building capacity of the material and slurry is weak. Selecting the third spiral segment and the fourth spiral segment with different leads as needed can not only ensure the conveying capacity of the material and slurry, but also extrude the material and slurry in the process of conveying the material and slurry, thereby facilitating the subsequent first pressure-building unit and the second pressure-building unit to knead the material and slurry into a lump.

[0032] As an optional technical solution of an embodiment of the present application, the third pressure-building unit is the spiral segment with the smallest lead on the first screw; and / or the fourth pressure-building unit is the spiral segment with the smallest lead on the second screw.

[0033] In the above technical solution, the third pressure-building unit and the fourth pressure-building unit are the spiral sections with the smallest lead on the first screw and the second screw respectively, and have the largest pressure-building capacity, which can conveniently pre-knead the material and slurry.

[0034] As an optional technical solution of an embodiment of the present application, the barrel includes a material inlet, the first screw includes a third mixing unit, and the third mixing unit is located upstream of the first mixing unit along the conveying direction of the material conveying channel. The second screw includes a fourth mixing unit, and the fourth mixing unit is located upstream of the second mixing unit along the conveying direction of the material conveying channel; the third mixing unit and the fourth mixing unit are arranged corresponding to the material inlet, and the third mixing unit and the fourth mixing unit are used to convey the material.

[0035] In the above technical solution, the third mixing unit and the fourth mixing unit are mainly used to transport materials, and quickly transport the materials entering the material conveying channel from the material inlet toward the first mixing unit and the second mixing unit, so that the first mixing unit and the second mixing unit can disperse and knead the materials and slurry to improve production efficiency.

[0036] As an optional technical solution of an embodiment of the present application, the third mixing unit includes a third ridge and a third recess, and the third ridge and the third recess are alternately arranged along the circumference of the first screw; the fourth mixing unit includes a fourth ridge and a fourth recess, and the fourth ridge and the fourth recess are alternately arranged along the circumference of the second screw; when the third ridge is engaged with the fourth recess, the fourth ridge is disengaged from the third recess; when the fourth ridge is engaged with the third recess, the third ridge is disengaged from the fourth recess.

[0037] In the above technical solution, the third ridge can cooperate with the fourth recess, and the fourth ridge can cooperate with the third recess. As the third and fourth mixing units rotate, the material is quickly transported toward the first and second mixing units.

[0038] As an optional technical solution of an embodiment of the present application, the third mixing unit includes a plurality of third ridges, and the plurality of third ridges are arranged at intervals along the circumference of the first screw; the fourth mixing unit includes a plurality of fourth ridges, and the plurality of fourth ridges are arranged at intervals along the circumference of the second screw, and the number of the third ridges is the same as the number of the fourth ridges.

[0039] In the above technical solution, by providing a plurality of third ridges and a plurality of fourth ridges, each third ridge cooperates with a corresponding fourth recess, and each fourth ridge cooperates with a corresponding third recess, so as to facilitate rapid conveying of materials.

[0040] As an optional technical solution of an embodiment of the present application, the third ridge and the fourth ridge both extend along a spiral trajectory, and the rotation direction of the third ridge is the same as the rotation direction of the fourth ridge.

[0041] In the above technical solution, by making the rotation direction of the third ridge and the rotation direction of the fourth ridge the same, it is beneficial to transport the material and slurry.

[0042] As an optional technical solution of the embodiment of the present application, the pitch of the third ridge is L1, which satisfies: 40mm≤L1≤60mm.

[0043] In the above technical solution, the pitch of the third ridge is larger, and the pitch of the fourth ridge is adapted to the pitch of the third ridge. The larger the pitch, the stronger the conveying capacity for materials and slurries, and the material can be quickly conveyed toward the first mixing unit and the second mixing unit, thereby improving production efficiency.

[0044] As an optional technical solution of an embodiment of the present application, the first screw includes a third pressure-building unit, and the third pressure-building unit is located upstream of the first mixing unit along the conveying direction of the feed channel; the second screw includes a fourth pressure-building unit, and the fourth pressure-building unit is located upstream of the second mixing unit along the conveying direction of the feed channel; the third pressure-building unit and the fourth pressure-building unit are used to pre-knead the material and the slurry; the third mixing unit is located upstream of the third pressure-building unit, and the fourth mixing unit is located upstream of the fourth pressure-building unit.

[0045] In the above technical solution, the third mixing unit and the fourth mixing unit quickly transport the material entering the conveying channel toward the third pressure building unit and the fourth pressure building unit. The third pressure building unit and the fourth pressure building unit can pre-knead the material and the slurry, which is conducive to uniform mixing of the material and the slurry.

[0046] As an optional technical solution of an embodiment of the present application, the barrel includes a slurry inlet. Along the conveying direction of the feed channel, the slurry inlet is located downstream of the third mixing unit and upstream of the third pressure building unit.

[0047] In the above technical solution, the slurry inlet is arranged downstream of the material inlet, so that the slurry can be mixed with the material after entering the feed channel, and is pre-kneaded in the third pressure building unit and the fourth pressure building unit, which is conducive to uniform mixing of the material and the slurry.

[0048] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device includes a cache mechanism, which is located downstream of the first extrusion mechanism and upstream of the second extrusion mechanism, and is used to cache the agglomerated material.

[0049] In the above technical solution, if the extrusion rate of the second extruder is too large, the blank will be extruded too much, which may easily result in excess material and cause the film to deviate during thinning and forming. If the extrusion rate of the second extruder is too small, the blank will be extruded too little, and the blank or film may be easily broken. By providing a buffer mechanism to buffer the lumps of material and controlling the feed of the second extruder, the extrusion rate of the second extruder is controlled, so that the extrusion rate of the second extruder is within a preset range.

[0050] As an optional technical solution of an embodiment of the present application, the cache mechanism includes a storage bin and a material level detection mechanism, the storage bin is used to cache the lump material; the material level detection mechanism is used to detect the material level of the lump material in the storage bin, and the first extrusion mechanism responds to the material level detection mechanism.

[0051] In the above technical solution, the storage bin can buffer the agglomerates, which can then be fed to the second extruder. A material level detection mechanism is used to monitor the material level within the storage bin. When the material level within the storage bin is high, indicating an excess of agglomerates, the extrusion rate of the first extruder can be reduced. When the material level within the storage bin is low, indicating a shortage of agglomerates, the extrusion rate of the first extruder can be increased. This creates negative feedback regulation, facilitating continuous, automated electrode production.

[0052] As an optional technical solution of an embodiment of the present application, the material level detection mechanism includes a light emitter and a light receiver, the light emitter is used to emit detection light; the light receiver is used to receive detection light, the light emitter and the light receiver are arranged opposite to each other, and the first extrusion mechanism responds to the light receiver.

[0053] In the above technical solution, when the material level in the storage bin is low, the lumps do not block the light receiver, allowing the light receiver to receive the detection light emitted by the light emitter. However, when the material level in the storage bin is high, the lumps block the light receiver, preventing it from receiving the detection light. The material level in the storage bin can be determined based on whether the light receiver can receive the detection light, which is simple, convenient, and low-cost.

[0054] As an optional technical solution of the embodiment of the present application, the second extrusion mechanism is a single-screw extruder.

[0055] In the above technical solution, the single-screw extruder has a strong pressure-building ability, which will squeeze the voids in the agglomerated material and drive the material into the space occupied by the voids, thereby obtaining a blank with consistent uniformity. The thinned and formed membrane has good lateral consistency, which is conducive to controlling the thickness and uniformity of the formed membrane.

[0056] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device further includes a premixing mechanism, which is arranged upstream of the first extrusion mechanism and is used to premix materials.

[0057] In the above technical solution, a premixing mechanism is provided to premix the material so that the material has better uniformity before entering the first extrusion mechanism. In this way, the material will have better uniformity after being extruded by the first extrusion mechanism and the second extrusion mechanism, and the quality of the formed diaphragm will be better, which is beneficial to improving the performance of the electrode.

[0058] As an optional technical solution of an embodiment of the present application, the electrode manufacturing device includes a drying mechanism, which is arranged downstream of the film forming mechanism and is used to dry the electrode.

[0059] In the above technical solution, the drying mechanism is provided to dry the electrode, which facilitates the rapid evaporation of moisture from the electrode, allowing the electrode to dry and set, thereby ensuring the performance of the electrode. In addition, the electrode manufactured by the electrode manufacturing device can be conveyed by rollers, and winding and folding structure ovens can be used, thereby shortening the oven length, reducing the equipment footprint, and lowering production costs.

[0060] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device includes a winding mechanism, which is arranged downstream of the film forming mechanism and is used to wind up the pole piece.

[0061] In the above technical solution, by providing a winding mechanism, the electrode can be quickly wound up, making it convenient to store and transport the electrode.

[0062] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device includes two of the film forming mechanisms, the first extrusion mechanism, the second extrusion mechanism and the film forming mechanism correspond one to one, and the composite mechanism is used to composite the films formed by the two film forming mechanisms on both sides of the substrate to form a pole piece.

[0063] In the above technical solution, by setting up two first extrusion mechanisms, two second extrusion mechanisms and two film forming mechanisms, two membranes can be produced at the same time. The composite mechanism composites the two membranes on both sides of the substrate, thereby producing a pole piece with active material layers on both sides of the substrate at one time.

[0064] In a second aspect, an embodiment of the present application further provides a method for manufacturing a pole piece, which comprises extruding a material and a slurry into a lump; extruding the lump into a blank; thinning the blank into a diaphragm; and compounding the diaphragm with a substrate to form a pole piece.

[0065] As an optional technical solution of the embodiment of the present application, before the lump material is extruded into a blank material, the pole piece manufacturing method further includes: buffering the lump material.

[0066] In the above technical solution, if too much blank is extruded, excess material is likely to form, and the diaphragm may be easily misaligned during thinning and forming. If too little blank is extruded, the blank or diaphragm may be easily broken. By buffering the lumps, the amount of blank extruded is controlled within a preset range, thereby ensuring better diaphragm forming quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0068] FIG1 is a schematic block diagram of a pole piece manufacturing apparatus provided in some embodiments of the present application;

[0069] FIG2 is a schematic structural diagram of a pole piece manufacturing device provided in some embodiments of the present application;

[0070] FIG3 is a schematic structural diagram of a first screw and a second screw provided in some embodiments of the present application;

[0071] FIG4 is a schematic structural diagram of a pole piece manufacturing device provided in some other embodiments of the present application;

[0072] FIG5 is a schematic diagram of the structure of a cache mechanism provided in some embodiments of the present application;

[0073] FIG6 is a schematic structural diagram of a pole piece manufacturing device provided in yet other embodiments of the present application;

[0074] FIG7 is a schematic structural diagram of a pole piece manufacturing device provided in some further embodiments of the present application;

[0075] FIG8 is a schematic structural diagram of a pole piece manufacturing device provided in some embodiments of the present application;

[0076] FIG9 is a schematic structural diagram of a pole piece manufacturing device provided in some other embodiments of the present application;

[0077] FIG10 is a schematic block diagram of a pole piece manufacturing method provided in some embodiments of the present application;

[0078] FIG11 is a schematic block diagram of a pole piece manufacturing method provided in some other embodiments of the present application.

[0079] Icons: 10-pole piece manufacturing device; 11-pole piece manufacturing method; 100-first extrusion mechanism; 110-first screw; 111-first mixing unit; 1111-first ridge; 1112-first recess; 112-first conveying unit; 1121-first spiral section; 113-first pressure-building unit; 114-third conveying unit; 115-third pressure-building unit; 116-fifth conveying unit; 1161-third spiral section; 117-third mixing unit; 1171-third ridge; 1172-third recess; 118-seventh conveying unit; 120-second screw; 121-second mixing unit; 1211-second ridge; 1212-second recess; 122-second conveying unit; 1221-second spiral section; 123-second pressure-building unit Pressure unit; 124-fourth conveying unit; 125-fourth pressure building unit; 126-sixth conveying unit; 1261-fourth spiral section; 127-fourth mixing unit; 1271-fourth ridge; 1272-fourth recess; 128-eighth conveying unit; 130-cache mechanism; 131-storage bin; 132-material level detection mechanism; 1321-light transmitter; 1322-light receiver; 140-premixing mechanism; 150-drying mechanism; 160-winding mechanism; 200-second extrusion mechanism; 210-pass roller; 300-film forming mechanism; 310-pressure roller; 311-first pressure roller; 400-compounding mechanism; 410-compounding roller; 500-lump material; 600-blank material; 700-diaphragm; 800-substrate; 900-pole piece. DETAILED DESCRIPTION

[0080] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0081] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0082] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0083] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0084] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0085] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0086] The term "plurality" used in this application refers to two or more (including two).

[0087] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0088] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing for enclosing one or more battery cells. The casing can, to a certain extent, prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0089] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive electrode collector. The portion of the positive electrode collector not coated with the positive active material layer protrudes from the portion coated with the positive active material layer. The portion of the positive electrode collector not coated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative electrode collector. The portion of the negative electrode collector not coated with the negative active material layer protrudes from the portion coated with the negative active material layer. The portion of the negative electrode collector not coated with the negative active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative active material can be carbon or silicon, among others. To ensure high current flow without melting, multiple positive tabs are stacked together, and multiple negative tabs are stacked together. The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). Furthermore, the electrode assembly can be a wound or laminated structure, but the present invention is not limited thereto.

[0090] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0091] Batteries include electrode assemblies, the components where electrochemical reactions occur. These assemblies are primarily composed of wound or stacked positive and negative electrode sheets. The inventors note that electrode sheet manufacturing is primarily categorized into wet and dry processes. However, dry-process electrode sheet manufacturing often exhibits inferior performance.

[0092] When manufacturing pole pieces using dry process technology, active material powder and granules are fed to the surface of a roller, where they are directly rolled into a film. This method of forming a film prevents the active material powder and granules from being evenly mixed, and the thickness of the film is difficult to guarantee. The active material layer of pole pieces produced using this method is less uniform, resulting in poor performance.

[0093] In view of this, an embodiment of the present application provides a pole piece manufacturing device, which includes a first extrusion mechanism, a second extrusion mechanism, a film forming mechanism, and a compounding mechanism. The first extrusion mechanism is used to extrude the material and slurry into a lump. The second extrusion mechanism is arranged downstream of the first extrusion mechanism, and the second extrusion mechanism is used to extrude the lump into a blank. The film forming mechanism is arranged downstream of the second extrusion mechanism, and the film forming mechanism is used to thin the blank into a membrane. The compounding mechanism is arranged downstream of the membrane forming mechanism, and the compounding mechanism is used to compound the membrane and the substrate to form the pole piece.

[0094] The pole piece manufacturing device extrude the material and slurry into a mass through the first extrusion mechanism, and the material and slurry can be mixed more evenly. The mass is extruded into a blank through the second extrusion mechanism. Compared with directly extruding the material and slurry into a blank, first the material and slurry are extruded into a mass through the first extrusion mechanism, and then the mass is extruded into a blank. On the one hand, the mixing of the material and the slurry will be more uniform. On the other hand, the extrusion resistance is relatively small, the extrusion speed is fast, and the quality of the extruded blank is higher. The blank is formed into a membrane through the membrane forming mechanism. In this process, the slurry plays a role similar to a "lubricant", which can promote the sliding of the material particles, so that the thinned membrane has good lateral consistency, which is conducive to controlling the thickness and uniformity of the formed membrane. When the pole piece is manufactured using this pole piece manufacturing device, the active material layer has good uniformity, the pole piece performance is excellent, and the manufacturing efficiency is high.

[0095] The technical solution described in the embodiments of this application is applicable to the manufacture of pole pieces.

[0096] Please refer to Figures 1 and 2. Figure 1 is a schematic block diagram of a pole piece manufacturing device 10 provided in some embodiments of the present application. Figure 2 is a structural schematic diagram of a pole piece manufacturing device 10 provided in some embodiments of the present application. The embodiment of the present application provides a pole piece manufacturing device 10, which includes a first extrusion mechanism 100, a second extrusion mechanism 200, a film forming mechanism 300 and a compounding mechanism 400. The first extrusion mechanism 100 is used to extrude the material and slurry into a lump material 500. The second extrusion mechanism 200 is arranged downstream of the first extrusion mechanism 100, and the second extrusion mechanism 200 is used to extrude the lump material 500 into a blank material 600. The film forming mechanism 300 is arranged downstream of the second extrusion mechanism 200, and the film forming mechanism 300 is used to thin the blank material 600 into a membrane 700. The compounding mechanism 400 is arranged downstream of the membrane forming mechanism 300, and the compounding mechanism 400 is used to compound the membrane 700 and the substrate 800 to form a pole piece 900.

[0097] The first extrusion mechanism 100 is a mechanism capable of performing an extrusion molding process. The first extrusion mechanism 100 can be used to extrude the material and slurry into a mass 500, thereby facilitating a uniform mixing of the material and slurry. The first extrusion mechanism 100 includes, but is not limited to, a plunger extrusion mechanism, a twin-screw extrusion mechanism, a single-screw extrusion mechanism, and the like.

[0098] The second extrusion mechanism 200 is also capable of performing an extrusion molding process. The second extrusion mechanism 200 can be used to extrude the agglomerated material 500 into a blank 600, thereby breaking open the voids in the agglomerated material and forcing the material into the spaces occupied by the voids, thereby producing a uniform blank 600. The second extrusion mechanism 200 includes, but is not limited to, a plunger extrusion mechanism, a twin-screw extrusion mechanism, a single-screw extrusion mechanism, and the like.

[0099] The materials include positive electrode active material / negative electrode active material, conductive agent, positive electrode solid binder / negative electrode solid binder, etc.

[0100] The positive electrode active material may include at least one of the following materials: lithium-containing phosphates with an olivine structure, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3O2 (also referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds. Examples of olivine-structured lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0101] The negative electrode active material may include at least one of carbon materials, silicon materials, lithium, and lithium alloy materials, wherein the carbon-containing material may include natural graphite, artificial graphite, mesophase carbon microbeads, hard carbon, soft carbon, etc., and the silicon material may include silicon oxide, silicon nanowires, composite silicon-carbon materials, etc.; the lithium and lithium alloy materials may include at least one of titanium oxide, lithium, lithium alloys, and materials capable of forming lithium alloys.

[0102] The conductive agent may include at least one of superconducting carbon, acetylene black, carbon black, Ketjen black, carbon dots, carbon nanotubes, graphene, and carbon nanofibers.

[0103] The positive electrode solid binder may include at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer and fluorine-containing acrylate resin, or a fluorine-free positive electrode binder may be used.

[0104] The negative electrode solid binder may include one of acrylonitrile, acrylic acid, and polyamide, or one of acrylonitrile-acrylic acid, acrylonitrile-polyamide, and acrylic acid-polyamide copolymer, or an acrylonitrile-acrylic acid-polyamide copolymer.

[0105] The slurry may include a liquid binder. The slurry may include small molecule alcohols, such as one or more of 1,4-butanediol, 1,3-butanediol, 2,3-butanediol, 1,2-propylene glycol, 1,3-propylene glycol, and 1,3-hexanediol; the slurry may also include esters, such as one or more of triethyl phosphate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, propylene carbonate, valerolactone, ethyl acetate, propyl acetate, butyl acetate, and methyl butyrate; and one or more of dioxane, N-methylpyrrolidone, acetone, butanone, N,N-dimethylacetamide, and dimethyl sulfoxide may also be used.

[0106] The pellet 500 is the product of the material and slurry extruded by the first extrusion mechanism 100. The pellet 500 formed by the first extrusion mechanism 100 can be continuous, with a section removed to form a pellet. The pellet 500 has a certain strength and flexibility, and its cross-sectional dimensions are much larger than those of the blank 600.

[0107] The blank 600 is the product formed by extruding the pellet 500 through the second extrusion mechanism 200. The blank 600 is thick, self-supporting, and not prone to breakage. The thickness of the blank 600 is generally 1 to 10 mm.

[0108] The membrane forming mechanism 300 is used to thin the blank 600 into a membrane sheet 700. Because the blank 600 is relatively thick and cannot be directly laminated with the substrate 800, the membrane forming mechanism 300 thins the blank 600 to form the membrane sheet 700. The membrane sheet 700, thinned and formed by the membrane forming mechanism 300, has a more uniform distribution of active material and thickness, which improves the quality of the electrode sheet 900.

[0109] The composite structure 400 is a structure that combines the diaphragm 700 and the substrate 800 to form the electrode 900. From the perspective of the electrode 900, the diaphragm 700 is the active material layer of the electrode 900, and the substrate 800 is the current collector of the electrode 900. The substrate 800 can be a metal foil or a composite current collector. For example, as a metal foil, the substrate 800 of the negative electrode can be copper foil, and the substrate 800 of the positive electrode can be aluminum foil. The composite current collector can include a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material base layer (such as a base layer of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0110] The pole piece manufacturing device 10 extrude the material and slurry into a mass 500 through the first extrusion mechanism 100, and the material and slurry can be mixed more evenly. The mass 500 is extruded into a blank 600 by the second extrusion mechanism 200. Compared with directly extruding the material and slurry into a blank 600, firstly the material and slurry are extruded into a mass 500 by the first extrusion mechanism 100, and then the mass 500 is extruded into a blank 600. On the one hand, the mixing of the material and the slurry will be more uniform. On the other hand, the extrusion resistance is relatively small, the extrusion speed is fast, and the quality of the extruded blank 600 is higher. The blank 600 is formed into a diaphragm 700 by the membrane forming mechanism 300. In this process, the slurry plays a role similar to a "lubricant", which can promote the sliding of material particles, so that the thinned diaphragm 700 has good lateral consistency, which is conducive to controlling the thickness and uniformity of the formed diaphragm 700. When the pole piece manufacturing device 10 is used to manufacture the pole piece 900 , the active material layer has good uniformity, the pole piece 900 has excellent performance, and the manufacturing efficiency is high.

[0111] Please refer to Figures 2 and 3. Figure 3 is a schematic diagram of the structure of the first screw 110 and the second screw 120 provided in some embodiments of the present application. In some embodiments, the first extrusion mechanism 100 includes a barrel (not shown in the figure), a first screw 110 and a second screw 120. The barrel has a feed channel, and the feed channel has an outlet. The first screw 110 and the second screw 120 are rotatably disposed in the feed channel. The first screw 110 and the second screw 120 are used to cooperate in extruding the material and the slurry, and convey the material and the slurry to the outlet to form a mass 500.

[0112] The barrel is generally cylindrical in structure, and the hollow part of the barrel is used to accommodate the material. A material feeding channel is formed inside the barrel, and the material feeding channel has an outlet for allowing the material and slurry to leave the material feeding channel.

[0113] The first screw 110 and the second screw 120 are both screw structures. The first screw 110 and the second screw 120 are both rotatably arranged in the feed channel. The first extrusion mechanism 100 also includes a first drive mechanism and a second drive mechanism. The first drive mechanism is connected to the first screw 110, and the first drive mechanism is used to drive the first screw 110 to rotate. The second drive mechanism is connected to the second screw 120, and the second drive mechanism is used to drive the second screw 120 to rotate. The first screw 110 and the second screw 120 have the same rotation direction. The first drive mechanism and the second drive mechanism can be the same drive mechanism. In this case, the first drive mechanism can drive both the first screw 110 and the second screw 120 to rotate.

[0114] When the first screw 110 and the second screw 120 rotate, the first screw 110 and the second screw 120 cooperate to extrude the material and the slurry, and transport the material and the slurry to the outlet to form agglomerated material 500 .

[0115] When the first screw 110 and the second screw 120 rotate, the screw fins on the first screw 110 and the second screw 120 shear the material and slurry, thereby uniformly mixing the material and slurry. At the same time, the screw fins on the first screw 110 and the second screw 120 also transport the material and slurry, causing them to move toward the outlet and be squeezed near the outlet to form agglomerates 500.

[0116] Referring to Figures 2 and 3, in some embodiments, the first screw 110 includes a first mixing unit 111, a first conveying unit 112, and a first pressure-building unit 113. Along the conveying direction of the feed channel, the first conveying unit 112 is located downstream of the first mixing unit 111, and the first pressure-building unit 113 is located downstream of the first conveying unit 112. The second screw 120 includes a second mixing unit 121, a second conveying unit 122, and a second pressure-building unit 123. Along the conveying direction of the feed channel, the second conveying unit 122 is located downstream of the second mixing unit 121, and the second pressure-building unit 123 is located downstream of the second conveying unit 122. The first mixing unit 111 and the second mixing unit 121 are used to disperse and knead the material and slurry. The first conveying unit 112 and the second conveying unit 122 are used to convey the material and slurry kneaded by the first and second mixing units 111 and 121. The first and second pressure-building units 113 and 123 are used to extrude the material and slurry to form agglomerates 500.

[0117] The conveying direction of the conveying channel can also be understood as the extending direction of the first screw 110 or the second screw 120. Referring to Figure 3, the conveying direction of the conveying channel can be the X direction shown in the figure.

[0118] The structures of the first and second internal mixing units 111, 121 are similar to those of the rotors of an internal mixer. The first and second internal mixing units 111, 121 match each other and cooperate to disperse and knead the material and the slurry, thereby uniformly mixing the material and the slurry.

[0119] The first conveying unit 112 and the second conveying unit 122 convey the material and slurry kneaded by the first and second mixing units 111, 121. For example, the first conveying unit 112 can convey the material and slurry kneaded by the first and second mixing units 111, 121 to the first pressure building unit 113. The second conveying unit 122 can convey the material and slurry kneaded by the first and second mixing units 111, 121 to the second pressure building unit 123.

[0120] The first pressure building unit 113 and the second pressure building unit 123 have strong pressure building capabilities. The first pressure building unit 113 and the second pressure building unit 123 can squeeze the material and the slurry and expel the air in the material to a certain extent to form agglomerates 500.

[0121] The first and second screws 110, 120 are respectively provided with a first and second mixing units 111, 121, which cooperate to disperse and knead the material and slurry, thereby uniformly mixing the material and slurry. The first and second conveying units 112, 122 are capable of conveying the material and slurry kneaded by the first and second mixing units 111, 121. The first and second pressure-building units 113, 123 are capable of compressing the material and slurry, expelling air from the material, making the material more dense and uniform, thereby forming the material and slurry into agglomerates 500.

[0122] Referring to Figures 2 and 3, in some embodiments, the first kneading unit 111 includes a first ridge 1111 and a first recess 1112, which are alternately arranged along the circumference of the first screw 110. The second kneading unit 121 includes a second ridge 1211 and a second recess 1212, which are alternately arranged along the circumference of the second screw 120. When the first ridge 1111 engages with the second recess 1212, the second ridge 1211 disengages from the first recess 1112. When the second ridge 1211 engages with the first recess 1112, the first ridge 1111 disengages from the second recess 1212.

[0123] The first ridge 1111 is a protrusion protruding from the rotating shaft of the first kneading unit 111. The first recess 1112 is a recessed portion relative to the first ridge 1111. The first ridge 1111 and the first recess 1112 are adjacent to each other. Optionally, the first kneading unit 111 includes two first ridges 1111, with the first recess 1112 formed between the two first ridges 1111 along the circumference of the first screw 110.

[0124] The second ridge 1211 is a protrusion protruding from the rotating shaft of the second kneading unit 121. The second recess 1212 is a recessed portion relative to the second ridge 1211. The second ridge 1211 and the second recess 1212 are adjacent to each other. Optionally, the second kneading unit 121 includes two second ridges 1211, with a second recess 1212 formed between the two second ridges 1211 along the circumference of the second screw 120.

[0125] The first ridge 1111 can cooperate with the second recess 1212, and the second ridge 1211 can cooperate with the first recess 1112. During the rotation of the first screw 110 and the second screw 120, the first ridge 1111 continuously cooperates with and separates from the second recess 1212, and the second ridge 1211 continuously separates from and cooperates with the first recess 1112, thereby dispersing and kneading the material and slurry.

[0126] The first ridge 1111 can cooperate with the second recess 1212, and the second ridge 1211 can cooperate with the first recess 1112. As the first mixing unit 111 and the second mixing unit 121 rotate, the material and the slurry are first sheared and broken up, and then squeezed and kneaded, so that the material and the slurry can be fully mixed. In this way, the diaphragm 700 formed subsequently has good uniformity, so that the electrode 900 has excellent performance.

[0127] 2 and 3 , in some embodiments, the first kneading unit 111 includes a plurality of first ridges 1111, which are spaced apart along the circumference of the first screw 110. The second kneading unit 121 includes a plurality of second ridges 1211, which are spaced apart along the circumference of the second screw 120. The number of the first ridges 1111 is the same as the number of the second ridges 1211.

[0128] The first kneading unit 111 includes a plurality of first ridges 1111. A first recess 1112 is formed between two adjacent first ridges 1111 along the circumference of the first screw 110. The first kneading unit 111 may include two first ridges 1111, three first ridges 1111, four first ridges 1111, or more than four first ridges 1111.

[0129] The second kneading unit 121 includes a plurality of second ridges 1211. A second recess 1212 is formed between two adjacent second ridges 1211 along the circumference of the second screw 120. The second kneading unit 121 may include two, three, four, or more second ridges 1211.

[0130] The number of the first ridges 1111 is the same as the number of the second ridges 1211 , and the number of the first recesses 1112 is the same as the number of the second recesses 1212 . One first ridge 1111 corresponds to one second recess 1212 , and one second ridge 1211 corresponds to one first recess 1112 .

[0131] By providing a plurality of first ridges 1111 and a plurality of second ridges 1211 , each first ridge 1111 cooperates with a corresponding second recess 1212 , and each second ridge 1211 cooperates with a corresponding first recess 1112 , the shearing, dispersion, extrusion and kneading of the material and slurry can be more sufficient.

[0132] 2 and 3 , in some embodiments, the first ridge 1111 and the second ridge 1211 both extend along a spiral trajectory, and the rotation direction of the first ridge 1111 and the rotation direction of the second ridge 1211 are opposite.

[0133] The first convex rib 1111 and the second convex rib 1211 both extend along a spiral trajectory, and both the first convex rib 1111 and the second convex rib 1211 have a spiral structure.

[0134] The rotation direction of the first rib 1111 is opposite to that of the second rib 1211. When the rotation direction of the first rib 1111 is clockwise, the rotation direction of the second rib 1211 is counterclockwise. When the rotation direction of the first rib 1111 is counterclockwise, the rotation direction of the second rib 1211 is clockwise.

[0135] By making the rotation direction of the first convex rib 1111 and the rotation direction of the second convex rib 1211 opposite to each other, it is beneficial to disperse and knead the material and the slurry.

[0136] Referring to Figures 2 and 3, in some embodiments, the first screw 110 includes a plurality of first mixing units 111, which are arranged along the conveying direction of the feed channel. Two adjacent first mixing units 111 are connected by a third conveying unit 114. The second screw 120 includes a plurality of second mixing units 121, which are arranged along the conveying direction of the feed channel. Two adjacent second mixing units 121 are connected by a fourth conveying unit 124. The fourth conveying unit 124 corresponds one-to-one with the third conveying unit 114.

[0137] The first screw 110 may include two first banburying units 111, three first banburying units 111, four first banburying units 111, or more than four first banburying units 111. The number of the second banburying units 121 of the second screw 120 is the same as the number of the first banburying units 111 on the first screw 110, and the positions thereof correspond, so that one first banburying unit 111 cooperates with one second banburying unit 121 to disperse and knead the materials and slurry.

[0138] A third conveying unit 114 is provided between two adjacent first mixing units 111, and a fourth conveying unit 124 is provided between two adjacent second mixing units 121. The third conveying unit 114 and the fourth conveying unit 124 can convey the material and slurry kneaded by the previous set of first mixing units 111 and second mixing units 121 to the next set of first mixing units 111 and second mixing units 121.

[0139] Due to the different material properties of the positive and negative electrode sheets, the number of first and second mixing units 111, 121 can be set accordingly. For positive electrode sheets, the number of first and second mixing units 111, 121 can be set to 2 to 4. For negative electrode sheets, the number of first and second mixing units 111, 121 can be set to 4 to 8.

[0140] By providing a plurality of first mixing units 111 and a plurality of second mixing units 121 , the material and the slurry are dispersed and kneaded multiple times, so that the material and the slurry can be fully and uniformly mixed.

[0141] 2 and 3 , in some embodiments, the first conveying unit 112 includes a plurality of first helical segments 1121 , at least two of which have different leads. The second conveying unit 122 includes a plurality of second helical segments 1221 , at least two of which have different leads.

[0142] The first helical segment 1121 is provided with spiral flights. The leads of the spiral flights of different first helical segments 1121 can be the same or different. For example, the first conveying unit 112 can include a long-lead first helical segment 1121 and a medium-lead first helical segment 1121. The lead of the long-lead first helical segment 1121 is greater than the lead of the medium-lead first helical segment 1121. The long-lead first helical segment 1121 and the medium-lead first helical segment 1121 are arranged along the conveying direction of the conveying channel.

[0143] The second helical segment 1221 is provided with spiral flights. The leads of the spiral flights of different second helical segments 1221 can be the same or different. For example, the second conveying unit 122 can include a long-lead second helical segment 1221 and a medium-lead second helical segment 1221. The lead of the long-lead second helical segment 1221 is greater than the lead of the medium-lead second helical segment 1221. The long-lead second helical segment 1221 and the medium-lead second helical segment 1221 are arranged along the conveying direction of the material conveying channel.

[0144] The first conveying unit 112 and the second conveying unit 122 are mainly used to convey materials and slurries. If the lead of the first spiral segment 1121 and the second spiral segment 1221 is small, the conveying capacity of the material and slurry is weak, and the pressure-building capacity of the material and slurry is strong. If the lead of the first spiral segment 1121 and the second spiral segment 1221 is large, the conveying capacity of the material and slurry is strong, and the pressure-building capacity of the material and slurry is weak. Selecting the first spiral segment 1121 and the second spiral segment 1221 with different leads as needed can not only ensure the conveying capacity of the material and slurry, but also extrude the material and slurry during the conveying process, thereby facilitating the subsequent first pressure-building unit 113 and the second pressure-building unit 123 to knead the material and slurry into a mass 500.

[0145] 2 and 3 , in some embodiments, the third conveying unit 114 includes a plurality of fifth helical segments, at least two of which have different leads. The fourth conveying unit 124 includes a plurality of sixth helical segments, at least two of which have different leads.

[0146] 2 and 3 , in some embodiments, the first pressure-building unit 113 is a spiral segment with the smallest lead on the first screw 110 , and / or the second pressure-building unit 123 is a spiral segment with the smallest lead on the second screw 120 .

[0147] The first pressure building unit 113 can be the spiral section with the smallest lead on the first screw 110, and the second pressure building unit 123 can also be the spiral section with the smallest lead on the second screw 120. The lead of the first pressure building unit 113 can be greater than the lead of the second pressure building unit 123, or equal to the lead of the second pressure building unit 123, or less than the lead of the second pressure building unit 123.

[0148] The first pressure-building unit 113 and the second pressure-building unit 123 may be the spiral segments with the smallest lead on the first screw 110 and the second screw 120 , respectively. They have the largest pressure-building capacity and can conveniently extrude the material and slurry into agglomerates 500 .

[0149] 2 and 3 , in some embodiments, the first screw 110 includes a third pressure-building unit 115, which is located upstream of the first mixing unit 111 along the conveying direction of the feed channel. The second screw 120 includes a fourth pressure-building unit 125, which is located upstream of the second mixing unit 121 along the conveying direction of the feed channel. The third and fourth pressure-building units 115, 125 are used to pre-knead the material and slurry.

[0150] Along the conveying direction of the conveying channel, the third pressure-building unit 115 is further away from the outlet than the first mixing unit 111 , and the fourth pressure-building unit 125 is further away from the outlet than the second mixing unit 121 .

[0151] The third pressure-building unit 115 and the fourth pressure-building unit 125 have strong pressure-building capabilities. They can extrude the material and slurry. The third pressure-building unit 115 and the fourth pressure-building unit 125 are positioned correspondingly, and the third pressure-building unit 115 and the fourth pressure-building unit 125 jointly pre-knead the material and slurry.

[0152] By providing the third pressure building unit 115 and the fourth pressure building unit 125 , the material and the slurry are pre-kneaded, which is beneficial for uniform mixing of the material and the slurry.

[0153] 2 and 3 , in some embodiments, the first screw 110 further includes a fifth conveying unit 116. Along the conveying direction of the conveying channel, the fifth conveying unit 116 is located downstream of the third pressure-building unit 115 and upstream of the first mixing unit 111. The second screw 120 further includes a sixth conveying unit 126. Along the conveying direction of the conveying channel, the sixth conveying unit 126 is located downstream of the fourth pressure-building unit 125 and upstream of the second mixing unit 121.

[0154] Along the conveying direction of the conveying channel, the fifth conveying unit 116 is located between the third pressure building unit 115 and the first mixing unit 111, and the sixth conveying unit 126 is located between the fourth pressure building unit 125 and the second mixing unit 121. The fifth conveying unit 116 and the sixth conveying unit 126 can convey the material and slurry pre-kneaded by the third pressure building unit 115 and the fourth pressure building unit 125 to the first mixing unit 111 and the second mixing unit 121.

[0155] By setting up the fifth conveying unit 116 and the sixth conveying unit 126, the material and slurry pre-kneaded by the third pressure building unit 115 and the fourth pressure building unit 125 are conveyed to the first mixing unit 111 and the second mixing unit 121, and are dispersed and kneaded again in the first mixing unit 111 and the second mixing unit 121, so that the material and slurry are mixed more evenly.

[0156] 2 and 3 , in some embodiments, the fifth conveying unit 116 includes a plurality of third helical segments 1161 , at least two of which have different leads. And / or the sixth conveying unit 126 includes a plurality of fourth helical segments 1261 , at least two of which have different leads.

[0157] The third helical segment 1161 is provided with spiral flights. The leads of the spiral flights of different third helical segments 1161 can be the same or different. For example, the fifth conveying unit 116 can include a third helical segment 1161 with a long lead and a third helical segment 1161 with a medium lead. The lead of the third helical segment 1161 with a long lead is greater than the lead of the third helical segment 1161 with a medium lead. The third helical segments 1161 with a long lead and the third helical segments 1161 with a medium lead are arranged along the conveying direction of the material conveying channel.

[0158] The fourth helical segment 1261 is provided with spiral flights. The leads of the spiral flights of different fourth helical segments 1261 can be the same or different. For example, the sixth conveying unit 126 can include a fourth helical segment 1261 with a long lead and a fourth helical segment 1261 with a medium lead. The lead of the fourth helical segment 1261 with a long lead is greater than the lead of the fourth helical segment 1261 with a medium lead. The fourth helical segments 1261 with a long lead and the fourth helical segments 1261 with a medium lead are arranged along the conveying direction of the material conveying channel.

[0159] The fifth conveying unit 116 and the sixth conveying unit 126 are mainly used to convey materials and slurries. If the lead of the third spiral segment 1161 and the fourth spiral segment 1261 is small, the conveying capacity of the material and slurry is weak, and the pressure-building capacity of the material and slurry is strong. If the lead of the third spiral segment 1161 and the fourth spiral segment 1261 is large, the conveying capacity of the material and slurry is strong, and the pressure-building capacity of the material and slurry is weak. By selecting the third spiral segment 1161 and the fourth spiral segment 1261 with different leads as needed, it is possible to ensure the conveying capacity of the material and slurry, and to extrude the material and slurry during the conveying process, thereby facilitating the subsequent first pressure-building unit 113 and the second pressure-building unit 123 to knead the material and slurry into a mass 500.

[0160] 2 and 3 , in some embodiments, the third pressure-building unit 115 is a spiral segment with the smallest lead on the first screw 110 , and / or the fourth pressure-building unit 125 is a spiral segment with the smallest lead on the second screw 120 .

[0161] The third pressure building unit 115 can be the spiral section with the smallest lead on the first screw 110, and the fourth pressure building unit 125 can also be the spiral section with the smallest lead on the second screw 120. The lead of the third pressure building unit 115 can be greater than the lead of the fourth pressure building unit 125, or can be equal to the lead of the fourth pressure building unit 125, or can be less than the lead of the fourth pressure building unit 125.

[0162] Optionally, the lead of the first pressure building unit 113, the lead of the second pressure building unit 123, the lead of the third pressure building unit 115 and the lead of the fourth pressure building unit 125 are all equal, and the first pressure building unit 113 and the third pressure building unit 115 are both the spiral sections with the smallest lead on the first screw 110, and the second pressure building unit 123 and the fourth pressure building unit 125 are both the spiral sections with the smallest lead on the second screw 120.

[0163] The third pressure-building unit 115 and the fourth pressure-building unit 125 are the spiral sections with the smallest lead on the first screw 110 and the second screw 120 respectively. They have the largest pressure-building capacity and can conveniently pre-knead the material and slurry.

[0164] Referring to Figures 2 and 3 , in some embodiments, the barrel includes a material inlet, and the first screw 110 includes a third mixing unit 117. Along the conveying direction of the material conveying channel, the third mixing unit 117 is located upstream of the first mixing unit 111. The second screw 120 includes a fourth mixing unit 127. Along the conveying direction of the material conveying channel, the fourth mixing unit 127 is located upstream of the second mixing unit 121. The third mixing unit 117 and the fourth mixing unit 127 are provided corresponding to the material inlet and are used to convey the material.

[0165] The slurry and the material are separately supplied to the first extrusion mechanism 100. The material inlet is an opening for supplying the material into the material feeding channel.

[0166] Along the conveying direction of the material conveying channel, the third mixing unit 117 is farther away from the outlet than the first mixing unit 111 , or in other words, the first mixing unit 111 is farther away from the material inlet than the third mixing unit 117 .

[0167] Along the conveying direction of the material conveying channel, the fourth mixing unit 127 is further away from the outlet than the second mixing unit 121. In other words, the second mixing unit 121 is further away from the material inlet than the fourth mixing unit 127. The position of the fourth mixing unit 127 corresponds to that of the third mixing unit 117, and both are located corresponding to the material inlet. In other words, the projection of the material inlet at least partially falls on the third mixing unit 117 and the fourth mixing unit 127.

[0168] Different from the first mixing unit 111 and the second mixing unit 121 , the third mixing unit 117 and the fourth mixing unit 127 are mainly used for conveying materials.

[0169] The third mixing unit 117 and the fourth mixing unit 127 are mainly used to transport materials, and quickly transport the materials entering the material conveying channel from the material inlet toward the first mixing unit 111 and the second mixing unit 121, so that the first mixing unit 111 and the second mixing unit 121 can disperse and knead the materials and slurry to improve production efficiency.

[0170] Referring to Figures 2 and 3 , in some embodiments, the third kneading unit 117 includes third ribs 1171 and third recesses 1172, which are alternately arranged along the circumference of the first screw 110. The fourth kneading unit 127 includes fourth ribs 1271 and fourth recesses 1272, which are alternately arranged along the circumference of the second screw 120. When the third ribs 1171 engage with the fourth recesses 1272, the fourth ribs 1271 disengage from the third recesses 1172; when the fourth ribs 1271 engage with the third recesses 1172, the third ribs 1171 disengage from the fourth recesses 1272.

[0171] The third ridge 1171 is a protrusion protruding from the rotating shaft of the third kneading unit 117. The third recess 1172 is a recessed portion relative to the third ridge 1171. The third ridge 1171 and the third recess 1172 are adjacent to each other. Optionally, the third kneading unit 117 includes two third ridges 1171, with the third recess 1172 formed between the two third ridges 1171 along the circumference of the first screw 110.

[0172] The fourth ridge 1271 is a protrusion protruding from the rotating shaft of the fourth kneading unit 127. The fourth recess 1272 is a recessed portion relative to the fourth ridge 1271. The fourth ridge 1271 and the fourth recess 1272 are adjacent to each other. Optionally, the fourth kneading unit 127 includes two fourth ridges 1271, with the fourth recess 1272 formed between the two fourth ridges 1271 along the circumference of the second screw 120.

[0173] The third ridge 1171 can cooperate with the fourth recess 1272, and the fourth ridge 1271 can cooperate with the third recess 1172. During the rotation of the first screw 110 and the second screw 120, the third ridge 1171 continuously cooperates with and separates from the fourth recess 1272, and the fourth ridge 1271 continuously separates from and cooperates with the third recess 1172, thereby conveying materials and slurry.

[0174] The third ridge 1171 can cooperate with the fourth recess 1272 , and the fourth ridge 1271 can cooperate with the third recess 1172 . As the third and fourth mixing units 117 and 127 rotate, the material is quickly transported toward the first and second mixing units 111 and 121 .

[0175] 2 and 3 , in some embodiments, the third kneading unit 117 includes a plurality of third ridges 1171 spaced apart along the circumference of the first screw 110. The fourth kneading unit 127 includes a plurality of fourth ridges 1271 spaced apart along the circumference of the second screw 120. The number of third ridges 1171 is the same as the number of fourth ridges 1271.

[0176] The third kneading unit 117 includes a plurality of third ridges 1171. A third recess 1172 is formed between two adjacent third ridges 1171 along the circumference of the first screw 110. The third kneading unit 117 may include two third ridges 1171, three third ridges 1171, four third ridges 1171, or more than four third ridges 1171.

[0177] The fourth kneading unit 127 includes a plurality of fourth ridges 1271. A fourth recess 1272 is formed between two adjacent fourth ridges 1271 along the circumference of the second screw 120. The fourth kneading unit 127 may include two, three, four, or more fourth ridges 1271.

[0178] The number of the third ridges 1171 is the same as the number of the fourth ridges 1271 , and the number of the third recesses 1172 is the same as the number of the fourth recesses 1272 . One third ridge 1171 corresponds to one fourth recess 1272 , and one fourth ridge 1271 corresponds to one third recess 1172 .

[0179] By providing a plurality of third ridges 1171 and a plurality of fourth ridges 1271 , each third ridge 1171 cooperates with a corresponding fourth recess 1272 , and each fourth ridge 1271 cooperates with a corresponding third recess 1172 , so as to facilitate rapid conveying of materials.

[0180] 2 and 3 , in some embodiments, the third ridge 1171 and the fourth ridge 1271 both extend along a spiral trajectory, and the rotation direction of the third ridge 1171 is the same as the rotation direction of the fourth ridge 1271 .

[0181] The third ridge 1171 and the fourth ridge 1271 both extend along a spiral trajectory, and both the third ridge 1171 and the fourth ridge 1271 have a spiral structure.

[0182] The rotation direction of the third rib 1171 is the same as that of the fourth rib 1271. When the rotation direction of the third rib 1171 is clockwise, the rotation direction of the fourth rib 1271 is clockwise. When the rotation direction of the third rib 1171 is counterclockwise, the rotation direction of the fourth rib 1271 is counterclockwise.

[0183] By making the rotation direction of the third rib 1171 and the rotation direction of the fourth rib 1271 the same, it is beneficial to transport materials and slurry.

[0184] 2 and 3 , in some embodiments, the pitch of the third ridge 1171 is L1, which satisfies the following: 40 mm ≤ L1 ≤ 60 mm.

[0185] L1 represents the pitch of the third ridge 1171 , that is, the distance between two corresponding points on the third ridge 1171 .

[0186] The pitch of the third ridge 1171 can be L1 = 40 mm, 42 mm, 45 mm, 48 mm, 50 mm, 52 mm, 55 mm, 58 mm, 60 mm, etc.

[0187] The pitch of the fourth ridge 1271 is the same as the pitch of the third ridge 1171 .

[0188] The pitch of the third ridge 1171 is relatively large, and the pitch of the fourth ridge 1271 is adapted to the pitch of the third ridge 1171. The larger the pitch, the stronger the conveying capacity for materials and slurries, and the material can be quickly conveyed toward the first mixing unit 111 and the second mixing unit 121, thereby improving production efficiency.

[0189] Referring to Figures 2 and 3, in some embodiments, the first screw 110 includes a third pressure-building unit 115, which is located upstream of the first mixing unit 111 along the conveying direction of the feed channel. The second screw 120 includes a fourth pressure-building unit 125, which is located upstream of the second mixing unit 121 along the conveying direction of the feed channel. The third and fourth pressure-building units 115, 125 are used to pre-knead the material and slurry. The third mixing unit 117 is located upstream of the third pressure-building unit 115, and the fourth mixing unit 127 is located upstream of the fourth pressure-building unit 125.

[0190] Along the conveying direction of the conveying channel, the third pressure building unit 115 is located between the first mixing unit 111 and the third mixing unit 117 , and the fourth pressure building unit 125 is located between the second mixing unit 121 and the fourth mixing unit 127 .

[0191] The third mixing unit 117 and the fourth mixing unit 127 quickly transport the material entering the feeding channel toward the third pressure building unit 115 and the fourth pressure building unit 125. The third pressure building unit 115 and the fourth pressure building unit 125 can pre-knead the material and the slurry, which is conducive to uniform mixing of the material and the slurry.

[0192] 2 and 3 , in some embodiments, the barrel includes a slurry inlet. Along the conveying direction of the conveying channel, the slurry inlet is located downstream of the third mixing unit 117 and upstream of the third pressure building unit 115 .

[0193] The slurry inlet is an opening for supplying slurry into the feed channel.

[0194] Along the conveying direction of the conveying channel, the slurry inlet is located between the third mixing unit 117 and the third pressure building unit 115 .

[0195] Along the conveying direction of the conveying channel, the material inlet, slurry inlet and outlet are arranged in sequence.

[0196] The slurry inlet is arranged downstream of the material inlet so that the slurry can be mixed with the material after entering the feed channel and pre-kneaded in the third pressure building unit 115 and the fourth pressure building unit 125, which is conducive to uniform mixing of the material and the slurry.

[0197] 2 and 3 , in some embodiments, the first screw 110 includes a seventh conveying unit 118. Along the conveying direction of the conveying channel, the seventh conveying unit 118 is located downstream of the third mixing unit 117 and upstream of the third pressure-building unit 115. The second screw 120 includes an eighth conveying unit 128. Along the conveying direction of the conveying channel, the eighth conveying unit 128 is located downstream of the fourth mixing unit 127 and upstream of the fourth pressure-building unit 125. Both the seventh conveying unit 118 and the eighth conveying unit 128 are located corresponding to the slurry inlet.

[0198] Along the conveying direction of the conveying channel, the seventh conveying unit 118 is located between the third mixing unit 117 and the third pressure building unit 115 , and the eighth conveying unit 128 is located between the fourth mixing unit 127 and the fourth pressure building unit 125 .

[0199] The seventh conveying unit 118 and the eighth conveying unit 128 are used to convey the material and slurry to the third pressure building unit 115 and the fourth pressure building unit 125 .

[0200] Please refer to Figure 4, which is a schematic diagram of the structure of a pole piece manufacturing device 10 provided in other embodiments of the present application. In other embodiments, the pole piece manufacturing device 10 includes a buffer mechanism 130, which is located downstream of the first extrusion mechanism 100 and upstream of the second extrusion mechanism 200. The buffer mechanism 130 is used to buffer the pellet 500.

[0201] The buffer mechanism 130 is used to buffer the pellet 500. The buffer mechanism 130 is located between the first extrusion mechanism 100 and the second extrusion mechanism 200. The pellet 500 extruded by the first extrusion mechanism 100 enters the buffer mechanism 130 for buffering and is then supplied to the second extrusion mechanism 200.

[0202] If the extrusion rate of the second extrusion mechanism 200 is too high, the blank 600 will be overextended, resulting in excess material and causing the film 700 to deviate during thinning. If the extrusion rate of the second extrusion mechanism 200 is too low, the blank 600 will be underextruded, and the blank 600 or film 700 may be easily broken. By providing a buffer mechanism 130 to buffer the bulk material 500 and control the feed to the second extrusion mechanism 200, the extrusion rate of the second extrusion mechanism 200 is controlled, thereby ensuring that the extrusion rate of the second extrusion mechanism 200 is within a preset range.

[0203] Please refer to Figures 4 and 5. Figure 5 is a schematic diagram of the structure of a buffer mechanism 130 provided in some embodiments of the present application. In some embodiments, the buffer mechanism 130 includes a storage bin 131 and a level detection mechanism 132. The storage bin 131 is used to buffer the pellets 500. The level detection mechanism 132 is used to detect the level of the pellets 500 within the storage bin 131. The first extrusion mechanism 100 responds to the level detection mechanism 132.

[0204] The storage bin 131 is a silo structure for temporarily storing the pellets 500. The storage bin 131 has an inlet and an outlet. The pellets 500 can enter the storage bin 131 through the inlet and be buffered therein. The pellets 500 can also exit the storage bin 131 through the outlet and be supplied to the second extrusion mechanism 200. Optionally, the storage bin 131 can be a hopper to facilitate the flow of the pellets 500 toward the second extrusion mechanism 200 under the action of gravity.

[0205] The material level detection mechanism 132 is a mechanism for detecting the material level of the agglomerated material 500 in the storage bin 131 , or in other words, the material level detection mechanism 132 is a mechanism for detecting the amount of the agglomerated material 500 in the storage bin 131 .

[0206] The material level detection mechanism 132 can be directly electrically connected to the first extrusion mechanism 100, or it can be indirectly electrically connected to the first extrusion mechanism 100 through an intermediate component. For example, the electrode manufacturing device 10 includes a controller, the material level detection mechanism 132 is electrically connected to the controller, and the controller is electrically connected to the first extrusion mechanism 100. When the material level detection mechanism 132 detects that the material level in the storage bin 131 exceeds a preset range, the controller can control the first extrusion mechanism 100 to reduce the extrusion amount. When the material level detection mechanism 132 detects that the material level in the storage bin 131 is lower than a preset range, the controller can control the first extrusion mechanism 100 to increase the extrusion amount. Optionally, the extrusion amount of the first extrusion mechanism 100 can be controlled by controlling the amount of material and slurry supplied to the first extrusion mechanism 100.

[0207] The storage bin 131 can buffer the agglomerate 500, and the agglomerate 500 in the storage bin 131 can be supplied to the second extrusion mechanism 200. The material level detection mechanism 132 is used to detect the material level in the storage bin 131. When the material level in the storage bin 131 is high, it indicates that there is an excess of agglomerate 500, and the extrusion rate of the first extrusion mechanism 100 can be reduced. When the material level in the storage bin 131 is low, it indicates that there is too little agglomerate 500, and the extrusion rate of the first extrusion mechanism 100 can be increased. This forms a negative feedback regulation, which facilitates the continuous automated production of electrode pieces 900.

[0208] 4 and 5 , in some embodiments, the material level detection mechanism 132 includes a light emitter 1321 and a light receiver 1322. The light emitter 1321 is configured to emit detection light, and the light receiver 1322 is configured to receive the detection light. The light emitter 1321 and the light receiver 1322 are disposed opposite each other. The first extrusion mechanism 100 responds to the light receiver 1322.

[0209] The light emitter 1321 is a component capable of emitting detection light, such as a laser emitter. The light receiver 1322 is a component capable of receiving the detection light, such as a laser receiver. The light receiver 1322 generates a first potential signal when receiving the detection light and a second potential signal when not receiving the detection light. The first and second potential signals are different. Based on the changes in these two potential signals, it can be determined whether the bulk material 500 is blocking the detection light, thereby detecting the level of the bulk material 500 within the storage bin 131.

[0210] When the material level in the storage bin 131 is low, the lump material 500 does not block the light receiver 1322, allowing the light receiver 1322 to receive the detection light emitted by the light emitter 1321. However, when the material level in the storage bin 131 is high, the lump material 500 blocks the light receiver 1322, preventing it from receiving the detection light. The material level of the lump material 500 in the storage bin 131 can be determined based on whether the light receiver 1322 can receive the detection light, which is simple, convenient, and low-cost.

[0211] In some embodiments, the material level detection mechanism 132 includes multiple groups of light emitters 1321 and light receivers 1322, which are arranged at intervals along the height direction of the storage bin 131 to facilitate controlling the material level of the lump material 500 in the storage bin 131 within a preset range.

[0212] In other embodiments, the material level detection mechanism 132 may also use current response feedback, sonar, etc.

[0213] In some embodiments, the second extrusion mechanism 200 is a single-screw extruder.

[0214] The single-screw extruder has a strong pressure-building capability, which can break the voids in the agglomerated material and drive the material into the space occupied by the voids, thereby obtaining a uniform blank 600 and a thinned and formed diaphragm 700 with good lateral consistency, which is conducive to controlling the thickness and uniformity of the formed diaphragm 700.

[0215] 4 and 5 , in some embodiments, the film forming mechanism 300 includes a rolling mechanism for rolling the blank 600 to thin the blank 600 into a film 700 .

[0216] The rolling mechanism is a mechanism that causes continuous plastic deformation of the material. When the rolling mechanism rolls the blank 600, the thickness of the blank 600 can be reduced. After the thickness of the blank 600 is reduced to meet the design requirements, it can be formed into a diaphragm 700.

[0217] By rolling the blank 600 with a rolling mechanism, the blank 600 is thinned and formed into the diaphragm 700, which has high efficiency and good uniformity.

[0218] 4 and 5 , in some embodiments, the rolling mechanism includes a plurality of pressing rollers 310 , and a rolling gap is formed between two adjacent pressing rollers 310 for the blank 600 to pass through.

[0219] The rolling mechanism may include two pressing rollers 310 , three pressing rollers 310 , four pressing rollers 310 , or more than four pressing rollers 310 .

[0220] “A rolling gap is formed between two adjacent pressing rollers 310 for the blank 600 to pass through” means that the two adjacent pressing rollers 310 cooperate to roll the blank 600 to reduce the thickness of the blank 600 to be equal to the width of the rolling gap.

[0221] By providing a plurality of pressing rollers 310 , the plurality of pressing rollers 310 can gradually thin the blank 600 to form the membrane 700 , and the degree of thinning each time will not be too large, which is beneficial to improving the uniformity and thickness consistency of the membrane 700 .

[0222] Please refer to Figures 4 and 5. In some embodiments, along the conveying direction of the blank 600, the pressure roller 310 located at the end of the multiple pressure rollers 310 is the first pressure roller 311, and the composite mechanism 400 includes a composite roller 410. A composite gap is formed between the composite roller 410 and the first pressure roller 311 for the membrane 700 and the substrate 800 to pass through.

[0223] The first pressing roller 311 specifically refers to the last pressing roller 310 among the multiple pressing rollers 310 along the conveying direction of the blank 600. Referring to FIG4 , the rolling mechanism in FIG4 includes two pressing rollers 310. In this case, the blank 600 can be wound in any direction after passing through the rolling gap. Therefore, either of the two pressing rollers 310 can serve as the first pressing roller 311. Optionally, the rolling mechanism includes four pressing rollers 310, arranged sequentially from left to right. Counting from left to right, the blank 600 sequentially passes through the rolling gap formed between the first and second pressing rollers 310, the rolling gap formed between the second and third pressing rollers 310, and the rolling gap formed between the third and fourth pressing rollers 310. In this case, the fourth pressing roller 310 is the last pressing roller 310 among the multiple pressing rollers 310, and therefore serves as the first pressing roller 311.

[0224] The laminating roller 410 is a roller structure used to laminarly laminate the film 700 and the substrate 800. The laminating roller 410 cooperates with the first pressing roller 311 to laminarly laminate the film 700 and the substrate 800, thereby reducing the number of laminating rollers 410 required. Of course, in other embodiments, the laminating mechanism 400 may include multiple laminating rollers 410, which cooperate to roll and press the film 700 and the substrate 800 to form a composite.

[0225] The composite roller 410 cooperates with the first pressing roller 311 to roll the diaphragm 700 and the substrate 800 to composite the diaphragm 700 and the substrate 800 into the pole piece 900. The first pressing roller 311 serves as both a component for rolling the blank 600 and a component for composite the diaphragm 700 and the substrate 800. One component realizes two functions, simplifies the structure of the pole piece manufacturing device 10, and reduces the cost of the pole piece manufacturing device 10.

[0226] Please refer to Figure 6, which is a schematic diagram of the structure of the electrode manufacturing device 10 provided in some embodiments of the present application. In some other embodiments, the electrode manufacturing device 10 further includes a premixing mechanism 140, which is disposed upstream of the first extrusion mechanism 100 and is used to premix materials.

[0227] The premixing mechanism 140 is a mechanism for premixing the positive electrode active material / negative electrode active material, conductive agent, positive electrode solid binder / negative electrode solid binder, etc. Optionally, the premixing mechanism 140 is a premixing tank.

[0228] By setting up a premixing mechanism 140 to premix the material, the material has better uniformity before entering the first extrusion mechanism 100. In this way, the material will have better uniformity after being extruded and formed by the first extrusion mechanism 100 and the second extrusion mechanism 200, and the quality of the formed diaphragm 700 will be better, which is beneficial to improving the performance of the electrode 900.

[0229] Please refer to Figure 7, which is a schematic diagram of the structure of the electrode manufacturing device 10 provided in some other embodiments of the present application. In some other embodiments, the electrode manufacturing device 10 includes a drying mechanism 150, which is disposed downstream of the film forming mechanism 300 and is used to dry the electrode 900.

[0230] The drying mechanism 150 is provided to dry the electrode 900, which facilitates rapid evaporation of moisture from the electrode 900, allowing the electrode 900 to dry and set, thereby ensuring the performance of the electrode 900. In addition, the electrode 900 manufactured by the electrode manufacturing apparatus 10 can be conveyed by rollers 210, and a winding type or folding type structure oven can be used, thereby shortening the oven length, reducing the equipment footprint, and lowering production costs.

[0231] Please refer to Figure 8, which is a schematic diagram of the structure of a pole piece manufacturing device 10 provided in some embodiments of the present application. In some other embodiments, the pole piece manufacturing device 10 includes a winding mechanism 160, which is disposed downstream of the film forming mechanism 300 and is used to wind up the pole piece 900.

[0232] The winding mechanism 160 includes a winding roller, and the pole piece 900 is wound around the winding roller and is wound on the winding roller.

[0233] By providing the winding mechanism 160 , the electrode piece 900 can be quickly wound up, making it convenient to store and transport the electrode piece 900 .

[0234] Please refer to Figure 9, which is a schematic diagram of the structure of a pole piece manufacturing device 10 provided in some other embodiments of the present application. In some other embodiments, the pole piece manufacturing device 10 includes two film forming mechanisms 300, with a first extrusion mechanism 100, a second extrusion mechanism 200, and a film forming mechanism 300 corresponding to each other. The laminating mechanism 400 is used to laminate the films 700 formed by the two film forming mechanisms 300 onto both sides of a substrate 800 to form a pole piece 900.

[0235] By setting up two first extrusion mechanisms 100, two second extrusion mechanisms 200 and two film forming mechanisms 300, two diaphragms 700 can be produced at the same time. The compounding mechanism 400 compounds the two diaphragms 700 on both sides of the substrate 800, thereby producing a pole piece 900 with an active material layer on both sides of the substrate 800 at one time.

[0236] Please refer to FIG10 , which is a schematic block diagram of a pole piece manufacturing method 11 provided in some embodiments of the present application. The present application also provides a pole piece manufacturing method 11 , which includes:

[0237] Step S1: Extruding the material and slurry into a mass 500;

[0238] Step S2: Extruding the agglomerated material 500 into a blank material 600;

[0239] Step S3: thinning the blank 600 to form a diaphragm 700;

[0240] Step S4: Compounding the membrane 700 and the substrate 800 to form the pole piece 900 .

[0241] Please refer to FIG11, which is a schematic block diagram of a pole piece manufacturing method 11 provided in some other embodiments of the present application. In some embodiments, before the pellet 500 is extruded into a blank 600, the pole piece manufacturing method 11 further includes:

[0242] Step S5: Buffering the agglomerated material 500 .

[0243] In step S5 , the slug 500 can be cached by the buffer mechanism 130 . The buffer mechanism 130 is located between the first extrusion mechanism 100 and the second extrusion mechanism 200 . The slug 500 extruded by the first extrusion mechanism 100 enters the buffer mechanism 130 for cache and is then supplied to the second extrusion mechanism 200 .

[0244] If too much blank 600 is extruded, excess material may occur, and the diaphragm 700 may easily deviate during thinning and forming. If too little blank 600 is extruded, the blank 600 or the diaphragm 700 may be easily broken. By buffering the slug 500, the extrusion amount of blank 600 is controlled within a preset range, thereby ensuring better quality of the diaphragm 700 formed.

[0245] According to some embodiments of the present application, please refer to Figures 1 to 9.

[0246] The embodiment of the present application provides a pole piece manufacturing device 10, which includes a first extrusion mechanism 100, a second extrusion mechanism 200, a film forming mechanism 300 and a compounding mechanism 400. The first extrusion mechanism 100 is used to extrude the material and slurry into a mass 500. The second extrusion mechanism 200 is arranged downstream of the first extrusion mechanism 100, and the second extrusion mechanism 200 is used to extrude the mass 500 into a blank 600. The film forming mechanism 300 is arranged downstream of the second extrusion mechanism 200, and the film forming mechanism 300 is used to thin the blank 600 into a membrane 700. The compounding mechanism 400 is arranged downstream of the membrane forming mechanism 300, and the compounding mechanism 400 is used to compound the membrane 700 and the substrate 800 to form a pole piece 900. The pole piece manufacturing device 10 extrudes the material and slurry into a mass 500 through the first extrusion mechanism 100, and the material and the slurry can be mixed more evenly. The agglomerate 500 is extruded into a blank 600 by the second extrusion mechanism 200. Compared with directly extruding the material and the slurry into the blank 600, the material and the slurry are first extruded into the agglomerate 500 by the first extrusion mechanism 100, and then the agglomerate 500 is extruded into the blank 600. On the one hand, the mixing of the material and the slurry will be more uniform. On the other hand, the extrusion resistance is relatively small, the extrusion speed is fast, and the quality of the extruded blank 600 is higher. The blank 600 is formed into a diaphragm 700 by the membrane forming mechanism 300. In this process, the slurry plays a role similar to a "lubricant", which can promote the sliding of the material particles, so that the thinned diaphragm 700 has good lateral consistency, which is conducive to controlling the thickness and uniformity of the formed diaphragm 700. The electrode manufacturing device 10 is used to manufacture the electrode 900, and the active material layer has good uniformity, the electrode 900 has excellent performance, and the manufacturing efficiency is high.

[0247] The first extrusion mechanism 100 includes a barrel, a first screw 110, and a second screw 120. The barrel has a feed channel with an outlet. The first and second screws 110, 120 are rotatably disposed within the feed channel. The first and second screws 110, 120 cooperate to extrude the material and slurry and convey them to the outlet to form agglomerates 500. The first screw 110 includes a first mixing unit 111, a first conveying unit 112, and a first pressure-building unit 113. Along the feed channel, the first conveying unit 112 is located downstream of the first mixing unit 111, and the first pressure-building unit 113 is located downstream of the first conveying unit 112. The second screw 120 includes a second mixing unit 121, a second conveying unit 122, and a second pressure-building unit 123. Along the feed channel, the second conveying unit 122 is located downstream of the second mixing unit 121, and the second pressure-building unit 123 is located downstream of the second conveying unit 122. The first mixing unit 111 and the second mixing unit 121 are used to disperse and knead the material and slurry. The first conveying unit 112 and the second conveying unit 122 are used to convey the material and slurry kneaded by the first mixing unit 111 and the second mixing unit 121. The first pressure-building unit 113 and the second pressure-building unit 123 are used to extrude the material and slurry to form a mass 500. When the first screw 110 and the second screw 120 rotate, the screw fins on the first screw 110 and the second screw 120 will shear the material and slurry, thereby mixing the material and slurry evenly. At the same time, the screw fins on the first screw 110 and the second screw 120 will also transport the material and slurry, causing the material and slurry to move toward the outlet and be extruded near the outlet to form a mass 500. The first and second screws 110, 120 are respectively equipped with a first and second mixing units 111, 121, which cooperate to disperse and knead the material and slurry, thereby uniformly mixing the material and slurry. The first and second conveying units 112, 122 are capable of conveying the material and slurry kneaded by the first and second mixing units 111, 121. The first and second pressure-building units 113, 123 are capable of compressing the material and slurry, expelling air from the material, making the material more dense and uniform, and thus forming the material and slurry into agglomerates 500.

[0248] The first screw 110 includes a plurality of first banburying units 111, and the plurality of first banburying units 111 are arranged along the conveying direction of the feed channel. Two adjacent first banburying units 111 are connected by a third conveying unit 114. The second screw 120 includes a plurality of second banburying units 121, and the plurality of second banburying units 121 are arranged along the conveying direction of the feed channel. Two adjacent second banburying units 121 are connected by a fourth conveying unit 124. The fourth conveying unit 124 corresponds to the third conveying unit 114 one-to-one. By providing a plurality of first banburying units 111 and a plurality of second banburying units 121, the material and the slurry are dispersed and kneaded multiple times, so that the material and the slurry can be fully and evenly mixed.

[0249] The first screw 110 includes a third pressure-building unit 115, which is located upstream of the first mixing unit 111 along the conveying direction of the feed channel. The second screw 120 includes a fourth pressure-building unit 125, which is located upstream of the second mixing unit 121 along the conveying direction of the feed channel. The third and fourth pressure-building units 115, 125 are used to pre-knead the material and slurry. The third mixing unit 117 is located upstream of the third pressure-building unit 115, and the fourth mixing unit 127 is located upstream of the fourth pressure-building unit 125. The third and fourth mixing units 117, 127 quickly convey the material entering the feed channel toward the third and fourth pressure-building units 115, 125. The third and fourth pressure-building units 115, 125 can pre-knead the material and slurry, which helps to achieve uniform mixing of the material and slurry.

[0250] The barrel includes a material inlet, and the first screw 110 includes a third mixing unit 117. Along the conveying direction of the material conveying channel, the third mixing unit 117 is located upstream of the first mixing unit 111. The second screw 120 includes a fourth mixing unit 127. Along the conveying direction of the material conveying channel, the fourth mixing unit 127 is located upstream of the second mixing unit 121. The third mixing unit 117 and the fourth mixing unit 127 are arranged corresponding to the material inlet, and the third mixing unit 117 and the fourth mixing unit 127 are used to convey materials. The third mixing unit 117 and the fourth mixing unit 127 are mainly used to convey materials, and the materials entering the material conveying channel from the material inlet are quickly conveyed toward the first mixing unit 111 and the second mixing unit 121, so that the first mixing unit 111 and the second mixing unit 121 can disperse and knead the materials and slurry, thereby improving production efficiency.

[0251] The electrode manufacturing device 10 includes a buffer mechanism 130, which is located downstream of the first extrusion mechanism 100 and upstream of the second extrusion mechanism 200. The buffer mechanism 130 is used to buffer the agglomerate 500. If the extrusion amount of the second extrusion mechanism 200 is too large, the blank 600 will be extruded too much, and redundant material will easily appear. When the diaphragm 700 is thinned and formed, the diaphragm 700 will easily go off track. If the extrusion amount of the second extrusion mechanism 200 is too small, the blank 600 will be extruded too little, and the blank 600 or the diaphragm 700 will easily be broken. By setting the buffer mechanism 130 to buffer the agglomerate 500 and controlling the feed of the second extrusion mechanism 200, the extrusion amount of the second extrusion mechanism 200 can be controlled, so that the extrusion amount of the second extrusion mechanism 200 is within a preset range.

[0252] The electrode manufacturing apparatus 10 further includes a premixing mechanism 140, which is disposed upstream of the first extrusion mechanism 100 and is used to premix the material. By providing the premixing mechanism 140 to premix the material, the material is made more uniform before entering the first extrusion mechanism 100. This improves the uniformity of the material after extrusion molding by the first extrusion mechanism 100 and the second extrusion mechanism 200, resulting in a better quality of the molded diaphragm 700 and improving the performance of the electrode 900.

[0253] The electrode manufacturing apparatus 10 includes a drying mechanism 150, which is disposed downstream of the film forming mechanism 300. The drying mechanism 150 is used to dry the electrode 900. The provision of the drying mechanism 150 to dry the electrode 900 facilitates rapid evaporation of moisture from the electrode 900, allowing the electrode 900 to dry and set, thereby ensuring the performance of the electrode 900. Furthermore, the electrode 900 manufactured using the electrode manufacturing apparatus 10 can be conveyed via rollers 210, enabling the use of winding and folding oven structures, thereby shortening the oven length, reducing the equipment footprint, and lowering production costs.

[0254] The electrode manufacturing device 10 includes a winding mechanism 160, which is disposed downstream of the film forming mechanism 300 and is used to wind up the electrode 900. The winding mechanism 160 allows for rapid winding of the electrode 900, facilitating storage and transportation of the electrode 900.

[0255] The embodiment of the present application also provides a pole piece manufacturing method 11, which includes extruding the material and slurry into a lump 500; extruding the lump 500 into a blank 600; thinning the blank 600 into a diaphragm 700; and compounding the diaphragm 700 with a substrate 800 to form a pole piece 900.

[0256] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0257] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A pole piece manufacturing device, wherein: include: The first extrusion mechanism is used to extrude the material and slurry into a mass-shaped material; A second extrusion mechanism, disposed downstream of the first extrusion mechanism, and configured to extrude the agglomerated material into a blank material; A film forming mechanism, disposed downstream of the second extrusion mechanism, the film forming mechanism being used to thin the blank material into a film sheet; The composite mechanism is arranged downstream of the film forming mechanism, and is used for composite the film and the substrate to form a pole piece.

2. The pole piece manufacturing device according to claim 1, wherein: The first extrusion mechanism comprises: A barrel having a material delivery channel, wherein the material delivery channel has an outlet; The first screw and the second screw are rotatably disposed in the feed channel, and the first screw and the second screw are used to cooperate in extruding the material and the slurry, and conveying the material and the slurry to the outlet to form the agglomerated material.

3. The pole piece manufacturing device according to claim 2, wherein: The first screw comprises a first mixing unit, a first conveying unit and a first pressure-building unit. Along the conveying direction of the feed channel, the first conveying unit is located downstream of the first mixing unit, and the first pressure-building unit is located downstream of the first conveying unit. The second screw comprises a second mixing unit, a second conveying unit and a second pressure-building unit. Along the conveying direction of the feed channel, the second conveying unit is located downstream of the second mixing unit, and the second pressure-building unit is located downstream of the second conveying unit. The first internal mixing unit and the second internal mixing unit are used to disperse and knead the material and the slurry; The first conveying unit and the second conveying unit are used to convey the material and the slurry kneaded by the first mixing unit and the second mixing unit; The first pressure building unit and the second pressure building unit are used to extrude the material and the slurry to form the agglomerated material.

4. The pole piece manufacturing device according to claim 3, wherein: The first kneading unit includes a first convex ridge and a first concave portion, and the first convex ridge and the first concave portion are alternately arranged along the circumference of the first screw; The second kneading unit comprises a second convex ridge and a second concave portion, and the second convex ridge and the second concave portion are alternately arranged along the circumference of the second screw; When the first convex ridge is matched with the second concave portion, the second convex ridge is separated from the first concave portion; when the second convex ridge is matched with the first concave portion, the first convex ridge is separated from the second concave portion.

5. The pole piece manufacturing device according to claim 4, wherein: The first mixing unit includes a plurality of the first ridges, which are arranged at intervals along the circumference of the first screw; the second mixing unit includes a plurality of the second ridges, which are arranged at intervals along the circumference of the second screw, and the number of the first ridges is the same as the number of the second ridges.

6. The pole piece manufacturing device according to claim 4 or 5, wherein: The first convex ridge and the second convex ridge both extend along a spiral track, and the rotation direction of the first convex ridge is opposite to the rotation direction of the second convex ridge.

7. The pole piece manufacturing device according to any one of claims 3 to 6, wherein: The first screw includes a plurality of the first mixing units, the plurality of the first mixing units are arranged along the conveying direction of the feed channel, and two adjacent first mixing units are connected via a third conveying unit; The second screw comprises a plurality of the second mixing units, the plurality of the second mixing units are arranged along the conveying direction of the feed channel, and two adjacent second mixing units are connected via a fourth conveying unit; The fourth conveying unit corresponds to the third conveying unit one by one.

8. The pole piece manufacturing device according to any one of claims 3 to 7, wherein: The first conveying unit comprises a plurality of first spiral segments, and the leads of at least two of the first spiral segments are unequal; The second conveying unit includes a plurality of second spiral segments, and the leads of at least two of the second spiral segments are unequal.

9. The pole piece manufacturing device according to any one of claims 3 to 8, wherein: The first pressure-building unit is a spiral section with the smallest lead on the first screw; and / or The second pressure building unit is a spiral section with the smallest lead on the second screw.

10. The pole piece manufacturing device according to any one of claims 3 to 9, wherein: The first screw comprises a third pressure-building unit, and along the conveying direction of the conveying channel, the third pressure-building unit is located upstream of the first mixing unit; The second screw includes a fourth pressure-building unit, which is located in the first screw along the conveying direction of the conveying channel. Upstream of the second mixing unit; The third pressure-building unit and the fourth pressure-building unit are used for pre-kneading the material and the slurry.

11. The pole piece manufacturing device according to claim 10, wherein: The first screw further includes a fifth conveying unit, which is located downstream of the third pressure building unit and upstream of the first mixing unit along the conveying direction of the material conveying channel; The second screw further includes a sixth conveying unit. Along the conveying direction of the material conveying channel, the sixth conveying unit is located downstream of the fourth pressure building unit and upstream of the second mixing unit.

12. The pole piece manufacturing device according to claim 11, wherein: The fifth conveying unit comprises a plurality of third spiral segments, and the pitches of at least two of the third spiral segments are unequal; and / or The sixth conveying unit includes a plurality of fourth spiral segments, and the leads of at least two of the fourth spiral segments are unequal.

13. The pole piece manufacturing device according to claim 11 or 12, wherein: The third pressure-building unit is a spiral section with the smallest lead on the first screw; and / or The fourth pressure building unit is a spiral section with the smallest lead on the second screw.

14. The pole piece manufacturing device according to any one of claims 3 to 13, wherein: The barrel includes a material inlet, the first screw includes a third mixing unit, and along the conveying direction of the material conveying channel, the third mixing unit is located upstream of the first mixing unit, and the second screw includes a fourth mixing unit, and along the conveying direction of the material conveying channel, the fourth mixing unit is located upstream of the second mixing unit; The third mixing unit and the fourth mixing unit are arranged corresponding to the material inlet, and the third mixing unit and the fourth mixing unit are used to transport the material.

15. The pole piece manufacturing device according to claim 14, wherein: The third kneading unit includes a third convex ridge and a third concave portion, and the third convex ridge and the third concave portion are alternately arranged along the circumference of the first screw; The fourth kneading unit includes a fourth convex ridge and a fourth concave portion, and the fourth convex ridge and the fourth concave portion are alternately arranged along the circumference of the second screw; When the third convex ridge is matched with the fourth concave portion, the fourth convex ridge is separated from the third concave portion; when the fourth convex ridge is matched with the third concave portion, the third convex ridge is separated from the fourth concave portion.

16. The pole piece manufacturing device according to claim 15, wherein: The third mixing unit includes a plurality of third ridges, which are arranged at intervals along the circumference of the first screw; the fourth mixing unit includes a plurality of fourth ridges, which are arranged at intervals along the circumference of the second screw, and the number of the third ridges is the same as the number of the fourth ridges.

17. The pole piece manufacturing device according to claim 15 or 16, wherein: The third ridge and the fourth ridge both extend along a spiral track, and the rotation direction of the third ridge is the same as the rotation direction of the fourth ridge.

18. The pole piece manufacturing device according to claim 17, wherein: The pitch of the third convex ridge is L1, which satisfies: 40mm≤L1≤60mm.

19. The pole piece manufacturing device according to any one of claims 14 to 18, wherein: The first screw comprises a third pressure-building unit, and along the conveying direction of the conveying channel, the third pressure-building unit is located upstream of the first mixing unit; The second screw comprises a fourth pressure-building unit, and along the conveying direction of the conveying channel, the fourth pressure-building unit is located upstream of the second mixing unit; The third pressure building unit and the fourth pressure building unit are used for pre-kneading the material and the slurry; The third internal mixing unit is located upstream of the third pressure building unit, and the fourth internal mixing unit is located upstream of the fourth pressure building unit.

20. The pole piece manufacturing device according to claim 19, wherein: The barrel comprises a slurry inlet, and along the conveying direction of the feed channel, the slurry inlet is located downstream of the third mixing unit and upstream of the third pressure building unit.

21. The pole piece manufacturing device according to any one of claims 1 to 20, wherein: The pole piece manufacturing device comprises a buffer mechanism, which is located downstream of the first extrusion mechanism and upstream of the second extrusion mechanism, and is used to buffer the agglomerated material.

22. The pole piece manufacturing device according to claim 21, wherein: The cache mechanism comprises: A material storage bin, used for caching the agglomerated material; The material level detection mechanism is used to detect the material level of the lump material in the storage bin, and the first extrusion mechanism responds to the material level detection mechanism.

23. The pole piece manufacturing device according to claim 22, wherein: The material level detection mechanism comprises: A light emitter, used for emitting detection light; The light receiver is used to receive the detection light. The light transmitter is arranged opposite to the light receiver. The first extrusion mechanism responds to the light receiver.

24. The pole piece manufacturing device according to any one of claims 1 to 23, wherein: The second extrusion mechanism is a single screw extruder.

25. The pole piece manufacturing device according to any one of claims 1 to 24, wherein: The pole piece manufacturing device further comprises a premixing mechanism, which is arranged upstream of the first extrusion mechanism and is used for premixing materials.

26. The pole piece manufacturing device according to any one of claims 1 to 25, wherein: The pole piece manufacturing device comprises a drying mechanism, which is arranged downstream of the film forming mechanism and is used for drying the pole piece.

27. The pole piece manufacturing device according to any one of claims 1 to 26, wherein: The pole piece manufacturing device comprises a winding mechanism, which is arranged downstream of the film forming mechanism and is used for winding the pole piece.

28. The pole piece manufacturing device according to any one of claims 1 to 27, wherein: The pole piece manufacturing device includes two film forming mechanisms, the first extrusion mechanism, the second extrusion mechanism and the film forming mechanism correspond one to one, and the composite mechanism is used to composite the films formed by the two film forming mechanisms on both sides of the substrate to form a pole piece.

29. A method for manufacturing a pole piece, wherein: include: Extruding the material and slurry into agglomerated material; Extruding the agglomerated material into a blank material; Thinning the blank into a diaphragm; The membrane and the substrate are combined to form a pole piece.

30. The method for manufacturing a pole piece according to claim 29, wherein: Before the agglomerated material is extruded into a blank material, the pole piece manufacturing method further comprises: The mass is buffered.

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