Pole piece manufacturing device and pole piece manufacturing method

Abstract

The invention provides a pole piece manufacturing device and a pole piece manufacturing method, and relates to the field of batteries. The pole piece manufacturing device comprises a first extrusion mechanism, a second extrusion mechanism, a film forming mechanism and a compounding mechanism. The first extrusion mechanism is used for extruding and molding the material and the slurry into a bulk material; and the second extrusion mechanism is arranged at the downstream of the first extrusion mechanism and is used for extruding and molding the bulk material into a blank material. And the film forming mechanism is arranged at the downstream of the second extrusion mechanism and is used for thinning and forming the blank material into a film. And the compounding mechanism is arranged at the downstream of the membrane forming mechanism and is used for compounding the membrane and the base material to form the pole piece. According to the pole piece manufacturing device, the material and the slurry are extruded and molded into the bulk material through the first extrusion mechanism, and the material and the slurry can be uniformly mixed. When the pole piece is manufactured by adopting the pole piece manufacturing device, the uniformity of the active material layer is better, the pole piece performance is excellent, and the manufacturing efficiency is higher.

Description

Technical Field

[0001] 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

[0002] Batteries are widely used in the field of new energy, such as electric vehicles and new energy vehicles. New energy vehicles and electric vehicles have become a new trend in the development of the automotive industry. Batteries include electrode assemblies, which are the components in the battery where electrochemical reactions occur. Electrode assemblies are mainly composed of positive and negative electrode sheets wound or stacked.

[0003] At present, 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. Summary of the invention

[0004] 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.

[0005] 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 materials 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.

[0006] In the above technical scheme, the pole piece manufacturing device extrude the material and the slurry into a mass through the first extrusion mechanism, and the material and the slurry can be mixed more evenly. The mass is extruded into a blank by the second extrusion mechanism. Compared with directly extruding the material and the slurry into a blank, the material and the slurry are first extruded into a mass by 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 by 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. The pole piece is manufactured by the pole piece manufacturing device, the uniformity of the active material layer is good, the pole piece performance is excellent, and the manufacturing efficiency is high.

[0007] 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 conveying the material and the slurry to the outlet to form the agglomerated material.

[0008] In the above technical solution, when the first screw and the second screw rotate, the screw ridges on the first screw and the second screw will shear the material and the slurry, so that the material and the slurry are evenly mixed. At the same time, the screw ridges on the first screw and the second screw will also transport the material and the slurry, so that the material and the slurry move toward the outlet and are squeezed near the outlet to form a mass.

[0009] 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 agglomerated material.

[0010] In the above technical solution, the first screw and the second screw are respectively provided with a first mixing unit and a second mixing unit, and the first mixing unit and the second mixing unit can cooperate to disperse and knead the material and the slurry, so that the material and the slurry are evenly mixed. The first conveying unit and the second conveying unit can 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 can squeeze the material and the slurry, discharge the air in the material, make the material more dense and uniform, and thus shape the material and the slurry into agglomerates.

[0011] 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 matched with the second recess, the second ridge is separated from the first recess; when the second ridge is matched with the first recess, the first ridge is separated from the second recess.

[0012] 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 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 subsequent formed diaphragm has good uniformity and the electrode performance is excellent.

[0013] As an optional technical solution of an embodiment of the present application, the first mixing unit includes a plurality of the first ribs, and the plurality of the first ribs are arranged at intervals along the circumference of the first screw; the second mixing unit includes a plurality of the second ribs, and the plurality of the second ribs are arranged at intervals along the circumference of the second screw, and the number of the first ribs is the same as the number of the second ribs.

[0014] In the above technical solution, by providing a plurality of first ridges and a plurality of second ridges, each first ridge cooperates with a corresponding second recess, and each second ridge cooperates with a corresponding first recess, the shearing, dispersion, extrusion and kneading of the material and slurry will be more sufficient.

[0015] 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 the rotation direction of the second ridge.

[0016] In the above technical solution, by making the rotation direction of the first convex ridge opposite to the rotation direction of the second convex ridge, it is beneficial to disperse and knead the material and slurry.

[0017] 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 corresponds to the third conveying unit one by one.

[0018] In the above technical solution, by setting up a plurality of first mixing units and a plurality of second mixing units, the material and the slurry are dispersed and kneaded multiple times, so that the material and the slurry can be fully mixed and uniform. The third conveying unit and the fourth conveying unit can convey the material and the slurry kneaded by the previous group of the first mixing unit and the second mixing unit to the next group of the first mixing unit and the second mixing unit.

[0019] 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.

[0020] 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. Selecting the first spiral segment and the second 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, so as to facilitate the subsequent first pressure-building unit and the second pressure-building unit to knead the material and slurry into a mass.

[0021] As an optional technical solution of an embodiment of the present application, the first pressure building unit is a spiral segment with the smallest lead on the first screw; and / or the second pressure building unit is a spiral segment with the smallest lead on the second screw.

[0022] 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 have the largest pressure building capacity, and can conveniently extrude materials and slurries into agglomerated materials.

[0023] As an optional technical solution of an embodiment of the present application, the first screw includes a third pressure building unit, and along the conveying direction of the feed channel, the third pressure building unit is located upstream of the first mixing unit; the second screw includes a fourth pressure building unit, and along the conveying direction of the feed 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 for materials and slurries is weak, and the pressure-building capacity for materials and slurries is strong. If the lead of the third spiral segment and the fourth spiral segment is large, the conveying capacity for materials and slurries is strong, and the pressure-building capacity for materials and slurries is weak. Selecting the third spiral segment and the fourth spiral segment with different leads as needed can not only ensure the conveying capacity for materials and slurries, but also extrude the materials and slurries in the process of conveying the materials and slurries, thereby facilitating the subsequent first pressure-building unit and the second pressure-building unit to knead the materials and slurries into a mass.

[0029] 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.

[0030] 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, and can conveniently pre-knead the material and slurry.

[0031] 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 feed channel, and 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 feed 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.

[0032] 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.

[0033] 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 cooperates with the fourth recess, the fourth ridge disengages from the third recess; when the fourth ridge cooperates with the third recess, the third ridge disengages from the fourth recess.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] In the above technical solution, by making the rotation direction of the third convex ridge and the rotation direction of the fourth convex ridge the same, it is beneficial to transport the material and slurry.

[0039] As an optional technical solution of the embodiment of the present application, the pitch of the third convex ridge is L1, which satisfies: 40mm≤L1≤60mm.

[0040] 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.

[0041] 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 for pre-kneading 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.

[0042] In the above technical solution, the third mixing unit and the fourth mixing unit quickly transport the material entering the feed 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.

[0043] As an optional technical solution of an embodiment of the present application, the barrel includes 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.

[0044] 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.

[0045] 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 the cache mechanism is used to cache the agglomerated material.

[0046] In the above technical solution, if the extrusion amount of the second extrusion mechanism is too large, the blank material is extruded too much, and redundant material is likely to appear, and the diaphragm is likely to deviate when thinning and forming the diaphragm. If the extrusion amount of the second extrusion mechanism is too small, the blank material is extruded too little, and the blank material or the diaphragm is likely to be broken. By setting a buffer mechanism to buffer the agglomerated material and controlling the feed of the second extrusion mechanism, the extrusion amount of the second extrusion mechanism is controlled, so that the extrusion amount of the second extrusion mechanism is within a preset range.

[0047] 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.

[0048] In the above technical solution, the storage bin can cache the agglomerate, and the agglomerate in the storage bin can be supplied to the second extrusion mechanism. The material level detection mechanism is used to detect the material level in the storage bin. When the material level in the storage bin is high, it means that there is too much agglomerate, and the extrusion amount of the first extrusion mechanism can be reduced. When the material level in the storage bin is low, it means that there is too little agglomerate, and the extrusion amount of the first extrusion mechanism can be increased. In this way, negative feedback regulation is formed, which is conducive to the continuous and automated production of pole pieces.

[0049] 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 the detection light, the light emitter is arranged opposite to the light receiver, and the first extrusion mechanism responds to the light receiver.

[0050] In the above technical solution, when the material level in the storage bin is low, the agglomerated material cannot block the light receiver, and the light receiver can receive the detection light emitted by the light transmitter. When the material level in the storage bin is high, the agglomerated material blocks the light receiver, and the light receiver cannot receive the detection light emitted by the light transmitter. The material level of the agglomerated material in the storage bin can be judged based on whether the light receiver can receive the detection light, which is simple, convenient and low-cost.

[0051] As an optional technical solution of an embodiment of the present application, the second extrusion mechanism is a single-screw extruder.

[0052] 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 uniform blank. The thinned and formed diaphragm has good lateral consistency, which is beneficial to control the thickness and uniformity of the formed diaphragm.

[0053] 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.

[0054] 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 extrusion molding by the first extrusion mechanism and the second extrusion mechanism, and the quality of the molded diaphragm will be better, which is beneficial to improving the performance of the electrode.

[0055] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device includes a drying mechanism, which is arranged downstream of the film forming mechanism, and the drying mechanism is used to dry the pole piece.

[0056] In the above technical solution, by setting a drying mechanism to dry the electrode, it is beneficial to quickly evaporate the moisture of the electrode, so that the electrode is dried and shaped, thereby ensuring the performance of the electrode. In addition, the electrode manufactured by the electrode manufacturing device can be conveyed by rollers, and a winding type and a folding type structure oven can be used, thereby shortening the length of the oven, reducing the floor space of the equipment, and reducing the production cost.

[0057] 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 the winding mechanism is used to wind up the pole piece.

[0058] In the above technical solution, by providing a winding mechanism, the electrode sheet can be quickly wound up, making it convenient to store and transport the electrode sheet.

[0059] 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 film sheets formed by the two film forming mechanisms on both sides of the substrate to form a pole piece.

[0060] In the above technical solution, by setting two first extrusion mechanisms, two second extrusion mechanisms and two film forming mechanisms, two diaphragms can be produced simultaneously. The composite mechanism composites the two diaphragms on both sides of the substrate, thereby producing a pole piece with active material layers on both sides of the substrate at one time.

[0061] In a second aspect, an embodiment of the present application further provides a method for manufacturing a pole piece, the method comprising 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.

[0062] 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.

[0063] In the above technical solution, if the blank is extruded too much, redundant material is likely to appear, and the diaphragm is likely to deviate when thinning and forming the diaphragm. If the blank is extruded too little, the blank or the diaphragm is likely to be broken. By buffering the lumps, the extrusion amount of the blank is controlled within a preset range, so that the diaphragm forming quality is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0065] Figure 1 A schematic block diagram of a pole piece manufacturing device provided in some embodiments of the present application;

[0066] Figure 2 A schematic diagram of the structure of a pole piece manufacturing device provided in some embodiments of the present application;

[0067] Figure 3 A schematic diagram of the structure of a first screw and a second screw provided in some embodiments of the present application;

[0068] Figure 4 A schematic diagram of the structure of a pole piece manufacturing device provided in some other embodiments of the present application;

[0069] Figure 5 A schematic diagram of the structure of a cache mechanism provided in some embodiments of the present application;

[0070] Figure 6 A schematic diagram of the structure of a pole piece manufacturing device provided in some other embodiments of the present application;

[0071] Figure 7 A schematic diagram of the structure of a pole piece manufacturing device provided in some further embodiments of the present application;

[0072] Figure 8 A schematic diagram of the structure of a pole piece manufacturing device provided in some embodiments of the present application;

[0073] Fig. 9 A schematic diagram of the structure of a pole piece manufacturing device provided in some other embodiments of the present application;

[0074] Fig.10 A schematic block diagram of a pole piece manufacturing method provided in some embodiments of the present application;

[0075] Fig.11 A schematic block diagram of a pole piece manufacturing method provided for some other embodiments of the present application.

[0076] Icons: 10-pole manufacturing device; 11-pole 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-caching mechanism; 131-storage bin; 132-level detection mechanism; 1321-light transmitter; 1322-light receiver; 140-premixing mechanism; 150-drying mechanism; 160-winding mechanism; 200-second extrusion mechanism; 210-over 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

[0077] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0078] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0079] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0080] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0081] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0082] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0083] The term "plurality" used in the present application refers to two or more (including two).

[0084] In the present 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 the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0085] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells to a certain extent.

[0086] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode ear. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon. In order to ensure that a large current can be passed without melting, the number of positive pole ears is multiple and stacked together, and the number of negative pole ears is multiple and stacked together. The material of the isolation film can be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.

[0087] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0088] The battery includes an electrode assembly, which is a component in the battery where electrochemical reactions occur. The electrode assembly is mainly composed of a positive electrode sheet and a negative electrode sheet wound or stacked. The inventors noticed that the manufacturing of the electrode sheet is mainly divided into wet technology and dry technology. However, the performance of the electrode sheet manufactured by the dry technology is often poor.

[0089] When using dry process technology to manufacture pole pieces, the powder and particles of active materials are supplied to the surface of the roller, and the powder and particles of active materials are directly rolled into a film. In such a formed film, the powder and particles of active materials cannot be mixed evenly, and the thickness of the film is not easy to guarantee. The active material layer of pole pieces produced by such a film has poor uniformity, resulting in poor performance of the pole pieces.

[0090] 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 the slurry into a mass. The second extrusion mechanism is arranged downstream of the first extrusion mechanism, and the second extrusion mechanism is used to extrude the mass 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 film forming mechanism, and the compounding mechanism is used to compound the membrane and the substrate to form a pole piece.

[0091] The pole piece manufacturing device extrude the material and the slurry into a mass through the first extrusion mechanism, and the material and the 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 the slurry into a blank, the material and the slurry are first 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 material particles, so that the thinned membrane has good lateral consistency, which is conducive to controlling the thickness and uniformity of the formed membrane. The pole piece is manufactured using the pole piece manufacturing device, the uniformity of the active material layer is good, the pole piece performance is excellent, and the manufacturing efficiency is high.

[0092] The technical solution described in the embodiment of the present application is applicable to the manufacture of pole pieces.

[0093] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic block diagram of a pole piece manufacturing device 10 provided in some embodiments of the present application. Figure 2A schematic diagram of the structure of a pole piece manufacturing device 10 provided for 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 the slurry into a mass 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 mass 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.

[0094] 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 the slurry into a mass 500 so as to make the material and the slurry uniformly mixed. 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.

[0095] The second extrusion mechanism 200 is also a mechanism capable of performing an extrusion molding process. The second extrusion mechanism 200 can be used to extrude the agglomerated material 500 into a blank material 600, so as to break the cavities in the agglomerated material and drive the material into the space occupied by the cavities, thereby obtaining a blank material 600 with uniformity. 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.

[0096] The materials include positive electrode active material / negative electrode active material, conductive agent, positive electrode solid binder / negative electrode solid binder, etc.

[0097] 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 / 3 O2 (also referred to as NCM333), LiNi 0.5 Co0.2 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, etc. Examples of lithium-containing phosphates with an olivine structure 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.

[0098] The negative electrode active material may include at least one of a carbon material, a silicon material, lithium, and a lithium alloy material, wherein the carbon-containing material may include natural graphite, artificial graphite, mesophase carbon microspheres, 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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; one or more of dioxane, N-methylpyrrolidone, acetone, butanone, N,N-dimethylacetamide, and dimethyl sulfoxide may also be selected.

[0103] The mass material 500 is a product formed by extruding the material and the slurry through the first extrusion mechanism 100. The mass material 500 formed by the first extrusion mechanism 100 can be continuous, and a section thereof is selected and removed to form a mass structure. The mass material 500 has certain strength and flexibility, and its cross-sectional dimension is much larger than the cross-sectional dimension of the blank material 600.

[0104] The blank 600 is a product formed by extruding the mass 500 through the second extrusion mechanism 200. The blank 600 is thick, self-supporting, and not easy to break. The thickness of the blank 600 is generally 1 to 10 mm.

[0105] The film forming mechanism 300 is a mechanism that can thin the blank 600 to form the diaphragm 700. Since the blank 600 is thick and cannot be directly compounded with the substrate 800, the blank 600 is thinned by the film forming mechanism 300 to form the diaphragm 700. The diaphragm 700 thinned by the film forming mechanism 300 has better uniformity of active material and more uniform thickness, which is conducive to improving the quality of the pole piece 900.

[0106] The composite structure 400 is a structure for composite the membrane 700 and the substrate 800 into the pole piece 900. From the perspective of the pole piece 900, the membrane 700 is the active material layer of the pole piece 900, and the substrate 800 is the current collector of the pole piece 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 pole piece can be a copper foil, and the substrate 800 of the positive pole piece can be an aluminum foil. The composite current collector may 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 may 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.).

[0107] The pole piece manufacturing device 10 extrude the material and the slurry into a mass 500 through the first extrusion mechanism 100, and the material and the 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 the slurry into the blank 600, the material and the slurry are first extruded into a mass 500 by the first extrusion mechanism 100, and then the mass 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 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.

[0108] Please refer to Figure 2 and Figure 3 , Figure 3 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 arranged in the feed channel. The first screw 110 and the second screw 120 are used to cooperate in extruding materials and slurry, and convey the materials and slurry to the outlet to form a mass 500.

[0109] The barrel is generally in a cylindrical structure, and the hollow part of the cylindrical structure is used to contain the material. A material delivery channel is formed inside the barrel, and the material delivery channel has an outlet, and the outlet is used for the material and slurry to leave the material delivery channel.

[0110] The first screw 110 and the second screw 120 are both screw structures. The first screw 110 and the second screw 120 can be rotatably arranged in the feeding channel. The first extrusion mechanism 100 also includes a first driving mechanism and a second driving mechanism, the first driving mechanism is connected to the first screw 110, and the first driving mechanism is used to drive the first screw 110 to rotate. The second driving mechanism is connected to the second screw 120, and the second driving 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 driving mechanism and the second driving mechanism can be the same driving mechanism. At this time, the first driving mechanism can drive both the first screw 110 and the second screw 120 to rotate.

[0111] 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 a mass material 500 .

[0112] When the first screw 110 and the second screw 120 rotate, the screw ridges on the first screw 110 and the second screw 120 will shear the material and the slurry, so that the material and the slurry are evenly mixed. At the same time, the screw ridges on the first screw 110 and the second screw 120 will also transfer the material and the slurry, so that the material and the slurry move toward the outlet and are squeezed at a position close to the outlet to form a mass 500.

[0113] Please refer to Figure 2 and Figure 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 materials and slurry. The first conveying unit 112 and the second conveying unit 122 are used to convey the materials 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 materials and slurry to form agglomerates 500.

[0114] The conveying direction of the conveying channel can also be understood as the extension direction of the first screw 110 or the second screw 120. Figure 3 The conveying direction of the conveying channel can be the X direction shown in the figure.

[0115] The structures of the first and second internal mixing units 111 and 121 are similar to the rotor structure of the internal mixer. The first and second internal mixing units 111 and 121 match each other, and the first and second internal mixing units 111 and 121 cooperate to disperse and knead the material and the slurry, so that the material and the slurry are evenly mixed.

[0116] The first conveying unit 112 and the second conveying unit 122 convey the material and slurry kneaded by the first mixing unit 111 and the second mixing unit 121. For example, the first conveying unit 112 can convey the material and slurry kneaded by the first mixing unit 111 and the second mixing unit 121 to the first pressure building unit 113. The second conveying unit 122 can convey the material and slurry kneaded by the first mixing unit 111 and the second mixing unit 121 to the second pressure building unit 123.

[0117] 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 discharge the air in the material to a certain extent to form agglomerated material 500 .

[0118] The first screw 110 and the second screw 120 are respectively provided with a first mixing unit 111 and a second mixing unit 121, which can cooperate to disperse and knead the material and the slurry, so that the material and the slurry are evenly mixed. The first conveying unit 112 and the second conveying unit 122 can convey the material and the 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 can squeeze the material and the slurry, discharge the air in the material, make the material more dense and uniform, and thus shape the material and the slurry into a mass 500.

[0119] Please refer to Figure 2 and Figure 3 In some embodiments, the first mixing unit 111 includes a first convex rib 1111 and a first concave portion 1112, and the first convex rib 1111 and the first concave portion 1112 are alternately arranged along the circumference of the first screw 110. The second mixing unit 121 includes a second convex rib 1211 and a second concave portion 1212, and the second convex rib 1211 and the second concave portion 1212 are alternately arranged along the circumference of the second screw 120. When the first convex rib 1111 is matched with the second concave portion 1212, the second convex rib 1211 is separated from the first concave portion 1112. When the second convex rib 1211 is matched with the first concave portion 1112, the first convex rib 1111 is separated from the second concave portion 1212.

[0120] The first convex rib 1111 is a protrusion protruding from the rotating shaft of the first mixing unit 111. The first concave portion 1112 is a portion that is concave relative to the first convex rib 1111. The first convex rib 1111 and the first concave portion 1112 are adjacent. Optionally, the first mixing unit 111 includes two first convex ribs 1111, and along the circumference of the first screw 110, a first concave portion 1112 is formed between the two first convex ribs 1111.

[0121] The second convex rib 1211 is a protrusion protruding from the rotating shaft of the second mixing unit 121. The second recess 1212 is a portion recessed relative to the second convex rib 1211. The second convex rib 1211 and the second recess 1212 are adjacent. Optionally, the second mixing unit 121 includes two second convex ribs 1211, and along the circumference of the second screw 120, a second recess 1212 is formed between the two second convex ribs 1211.

[0122] The first convex rib 1111 can cooperate with the second concave portion 1212, and the second convex rib 1211 can cooperate with the first concave portion 1112. During the rotation of the first screw 110 and the second screw 120, the first convex rib 1111 continuously cooperates with and separates from the second concave portion 1212, and the second convex rib 1211 continuously separates from and cooperates with the first concave portion 1112, thereby dispersing and kneading the material and slurry.

[0123] The first ridge 1111 can cooperate with the second recess 1212, and the second ridge 1211 can cooperate with the first recess 1112. With the rotation of the first mixing unit 111 and the second mixing unit 121, 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 subsequently formed diaphragm 700 has good uniformity, so that the electrode 900 has excellent performance.

[0124] Please refer to Figure 2 and Figure 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.

[0125] 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.

[0126] 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.

[0127] The number of the first convex ribs 1111 is the same as the number of the second convex ribs 1211 , the number of the first recesses 1112 is the same as the number of the second recesses 1212 , one first convex rib 1111 corresponds to one second recess 1212 , and one second convex rib 1211 corresponds to one first recess 1112 .

[0128] 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.

[0129] Please refer to Figure 2 and Figure 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.

[0130] The first convex ridge 1111 and the second convex ridge 1211 both extend along a spiral track, and both the first convex ridge 1111 and the second convex ridge 1211 have a spiral structure.

[0131] The rotation direction of the first ridge 1111 is opposite to that of the second ridge 1211. When the rotation direction of the first ridge 1111 is right-handed, the rotation direction of the second ridge 1211 is left-handed. When the rotation direction of the first ridge 1111 is left-handed, the rotation direction of the second ridge 1211 is right-handed.

[0132] By making the rotation direction of the first convex ridge 1111 and the rotation direction of the second convex ridge 1211 opposite, it is beneficial to disperse and knead the material and the slurry.

[0133] Please refer to Figure 2 and Figure 3 In some embodiments, the first screw 110 includes a plurality of first mixing units 111, and the plurality of first mixing units 111 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, and the plurality of second mixing units 121 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 to the third conveying unit 114 one by one.

[0134] The first screw 110 may include two first banburying units 111, three first banburying units 111, four first banburying units 111, and 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 are corresponding, so that one first banburying unit 111 cooperates with one second banburying unit 121 to disperse and knead the material and slurry.

[0135] 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 materials and slurry kneaded by the previous group of first mixing units 111 and second mixing units 121 to the next group of first mixing units 111 and second mixing units 121.

[0136] Since the material properties of the positive electrode sheet and the negative electrode sheet are different, the number of the first mixing unit 111 and the second mixing unit 121 can also be set specifically. For the positive electrode sheet, the number of the first mixing unit 111 and the second mixing unit 121 can be set to 2 to 4. For the negative electrode sheet, the number of the first mixing unit 111 and the second mixing unit 121 can be set to 4 to 8.

[0137] 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 evenly mixed.

[0138] Please refer to Figure 2 and Figure 3 In some embodiments, the first conveying unit 112 includes a plurality of first helical segments 1121, and the pitches of at least two first helical segments 1121 are different. The second conveying unit 122 includes a plurality of second helical segments 1221, and the pitches of at least two second helical segments 1221 are different.

[0139] The first helical segment 1121 is provided with a spiral ridge, and the leads of the spiral ridges of different first helical segments 1121 may be the same or different. For example, the first conveying unit 112 may include a first helical segment 1121 with a long lead and a first helical segment 1121 with a medium lead. The lead of the first helical segment 1121 with a long lead is greater than the lead of the first helical segment 1121 with a medium lead. The first helical segment 1121 with a long lead and the first helical segment 1121 with a medium lead are arranged along the conveying direction of the conveying channel.

[0140] The second helical segment 1221 is provided with a spiral ridge, and the spiral ridges of different second helical segments 1221 may have the same or different leads. For example, the second conveying unit 122 may include a second helical segment 1221 with a long lead and a second helical segment 1221 with a medium lead. The lead of the second helical segment 1221 with a long lead is greater than the lead of the second helical segment 1221 with a medium lead. The second helical segment 1221 with a long lead and the second helical segment 1221 with a medium lead are arranged along the conveying direction of the material conveying channel.

[0141] 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 materials and slurries is weak, and the pressure-building capacity of materials and slurries is strong. If the lead of the first spiral segment 1121 and the second spiral segment 1221 is large, the conveying capacity of materials and slurries is strong, and the pressure-building capacity of materials and slurries 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 materials and slurries, but also extrude materials and slurries during the process of conveying materials and slurries, so as to facilitate the subsequent first pressure-building unit 113 and the second pressure-building unit 123 to knead the materials and slurries into agglomerates 500.

[0142] Please refer to Figure 2 and Figure 3 In some embodiments, the third conveying unit 114 includes a plurality of fifth helical segments, and the pitches of at least two fifth helical segments are different. The fourth conveying unit 124 includes a plurality of sixth helical segments, and the pitches of at least two sixth helical segments are different.

[0143] Please refer to Figure 2 and Figure 3 In some embodiments, the first pressure-building unit 113 is a spiral segment with the smallest pitch on the first screw 110 . And / or the second pressure-building unit 123 is a spiral segment with the smallest pitch on the second screw 120 .

[0144] The first pressure building unit 113 may be the spiral section with the smallest lead on the first screw 110, and the second pressure building unit 123 may be the spiral section with the smallest lead on the second screw 120. The lead of the first pressure building unit 113 may be greater than the lead of the second pressure building unit 123, or may be equal to the lead of the second pressure building unit 123, or may be less than the lead of the second pressure building unit 123.

[0145] The first pressure-building unit 113 and the second pressure-building unit 123 may be the spiral sections with the smallest pitch on the first screw 110 and the second screw 120 , respectively, and have the largest pressure-building capacity, and can conveniently extrude the material and slurry into agglomerated material 500 .

[0146] Please refer to Figure 2 and Figure 3 In some embodiments, the first screw 110 includes a third pressure-building unit 115, and along the conveying direction of the conveying channel, the third pressure-building unit 115 is located upstream of the first mixing unit 111. The second screw 120 includes a fourth pressure-building unit 125, and along the conveying direction of the conveying channel, the fourth pressure-building unit 125 is located upstream of the second mixing unit 121. The third pressure-building unit 115 and the fourth pressure-building unit 125 are used to pre-knead the material and the slurry.

[0147] Along the feeding direction of the feeding channel, the third pressure-building unit 115 is farther away from the outlet than the first mixing unit 111 , and the fourth pressure-building unit 125 is farther away from the outlet than the second mixing unit 121 .

[0148] The third pressure-building unit 115 and the fourth pressure-building unit 125 have strong pressure-building capabilities. The third pressure-building unit 115 and the fourth pressure-building unit 125 can extrude materials and slurries, and the positions of the third pressure-building unit 115 and the fourth pressure-building unit 125 correspond to each other, and the third pressure-building unit 115 and the fourth pressure-building unit 125 jointly pre-knead the materials and slurries.

[0149] 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.

[0150] Please refer to Figure 2 and Figure 3 In some embodiments, the first screw 110 further includes a fifth conveying unit 116, which is located downstream of the third pressure-building unit 115 and upstream of the first mixing unit 111 along the conveying direction of the feed channel. The second screw 120 further includes a sixth conveying unit 126, which is located downstream of the fourth pressure-building unit 125 and upstream of the second mixing unit 121 along the conveying direction of the feed channel.

[0151] Along the conveying direction of the feed 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.

[0152] By providing 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.

[0153] Please refer to Figure 2 and Figure 3 In some embodiments, the fifth conveying unit 116 includes a plurality of third helical segments 1161, and the pitches of at least two third helical segments 1161 are different. And / or the sixth conveying unit 126 includes a plurality of fourth helical segments 1261, and the pitches of at least two fourth helical segments 1261 are different.

[0154] The third helical segment 1161 is provided with a spiral ridge, and the leads of the spiral ridges of different third helical segments 1161 may be the same or different. For example, the fifth conveying unit 116 may 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 segment 1161 with a long lead and the third helical segment 1161 with a medium lead are arranged along the conveying direction of the conveying channel.

[0155] The fourth helical segment 1261 is provided with a spiral ridge, and the leads of the spiral ridges of different fourth helical segments 1261 may be the same or different. For example, the sixth conveying unit 126 may 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 segment 1261 with a long lead and the fourth helical segment 1261 with a medium lead are arranged along the conveying direction of the conveying channel.

[0156] 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 materials and slurries is weak, and the pressure-building capacity of materials and slurries is strong. If the lead of the third spiral segment 1161 and the fourth spiral segment 1261 is large, the conveying capacity of materials and slurries is strong, and the pressure-building capacity of materials and slurries is weak. The third spiral segment 1161 and the fourth spiral segment 1261 with different leads are selected as needed, which can not only ensure the conveying capacity of materials and slurries, but also extrude materials and slurries in the process of conveying materials and slurries, so as to facilitate the subsequent first pressure-building unit 113 and the second pressure-building unit 123 to knead the materials and slurries to form a mass 500.

[0157] Please refer to Figure 2 and Figure 3 In some embodiments, the third pressure-building unit 115 is a spiral section with the smallest pitch on the first screw 110 . And / or the fourth pressure-building unit 125 is a spiral section with the smallest pitch on the second screw 120 .

[0158] The third pressure building unit 115 may be the spiral section with the smallest lead on the first screw 110, and the fourth pressure building unit 125 may be the spiral section with the smallest lead on the second screw 120. The lead of the third pressure building unit 115 may be greater than the lead of the fourth pressure building unit 125, may be equal to the lead of the fourth pressure building unit 125, or may be less than the lead of the fourth pressure building unit 125.

[0159] 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.

[0160] 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, and have the largest pressure-building capacity, so that the material and the slurry can be pre-kneaded conveniently.

[0161] Please refer to Figure 2 and Figure 3 In some embodiments, the barrel includes a material inlet, the first screw 110 includes a third mixing unit 117, and 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, and 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.

[0162] The slurry and the material are separately supplied to the first extrusion mechanism 100. The material inlet is an opening for the material to enter the material feeding channel.

[0163] 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 .

[0164] Along the conveying direction of the material conveying channel, the fourth mixing unit 127 is farther away from the outlet than the second mixing unit 121, or in other words, the second mixing unit 121 is farther away from the material inlet than the fourth mixing unit 127. The position of the fourth mixing unit 127 corresponds to the position of the third mixing unit 117, and both are arranged 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.

[0165] 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.

[0166] 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.

[0167] Please refer to Figure 2 and Figure 3 In some embodiments, the third mixing unit 117 includes a third convex rib 1171 and a third concave portion 1172, and the third convex rib 1171 and the third concave portion 1172 are alternately arranged along the circumference of the first screw 110. The fourth mixing unit 127 includes a fourth convex rib 1271 and a fourth concave portion 1272, and the fourth convex rib 1271 and the fourth concave portion 1272 are alternately arranged along the circumference of the second screw 120. When the third convex rib 1171 is matched with the fourth concave portion 1272, the fourth convex rib 1271 is separated from the third concave portion 1172; when the fourth convex rib 1271 is matched with the third concave portion 1172, the third convex rib 1171 is separated from the fourth concave portion 1272.

[0168] The third convex rib 1171 is a protrusion protruding from the rotating shaft of the third mixing unit 117. The third recess 1172 is a portion recessed relative to the third convex rib 1171. The third convex rib 1171 and the third recess 1172 are adjacent. Optionally, the third mixing unit 117 includes two third convex ribs 1171, and a third recess 1172 is formed between the two third convex ribs 1171 along the circumference of the first screw 110.

[0169] The fourth convex rib 1271 is a protrusion protruding from the rotating shaft of the fourth kneading unit 127. The fourth recess 1272 is a portion recessed relative to the fourth convex rib 1271. The fourth convex rib 1271 and the fourth recess 1272 are adjacent. Optionally, the fourth kneading unit 127 includes two fourth convex ribs 1271, and a fourth recess 1272 is formed between the two fourth convex ribs 1271 along the circumference of the second screw 120.

[0170] 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.

[0171] The third convex ridge 1171 can cooperate with the fourth concave portion 1272 , and the fourth convex ridge 1271 can cooperate with the third concave portion 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 .

[0172] Please refer to Figure 2 and Figure 3 In some embodiments, the third kneading unit 117 includes a plurality of third ridges 1171, which are spaced apart along the circumference of the first screw 110. The fourth kneading unit 127 includes a plurality of fourth ridges 1271, which are spaced apart along the circumference of the second screw 120. The number of the third ridges 1171 is the same as the number of the fourth ridges 1271.

[0173] 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.

[0174] 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 fourth ridges 1271, three fourth ridges 1271, four fourth ridges 1271, or more than four fourth ridges 1271.

[0175] The number of the third ridges 1171 is the same as the number of the fourth ridges 1271 , 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 .

[0176] 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.

[0177] Please refer to Figure 2 and Figure 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 .

[0178] The third convex ridge 1171 and the fourth convex ridge 1271 both extend along a spiral trajectory, and both the third convex ridge 1171 and the fourth convex ridge 1271 are spiral structures.

[0179] The rotation direction of the third convex rib 1171 is the same as that of the fourth convex rib 1271. When the rotation direction of the third convex rib 1171 is right-handed, the rotation direction of the fourth convex rib 1271 is right-handed. When the rotation direction of the third convex rib 1171 is left-handed, the rotation direction of the fourth convex rib 1271 is left-handed.

[0180] By making the rotation direction of the third convex rib 1171 and the rotation direction of the fourth convex rib 1271 the same, it is beneficial to transport materials and slurry.

[0181] Please refer to Figure 2 and Figure 3 In some embodiments, the pitch of the third ridge 1171 is L1, satisfying: 40 mm ≤ L1 ≤ 60 mm.

[0182] L1 represents the pitch of the third ridge 1171 , that is, the distance between two corresponding points on the third ridge 1171 .

[0183] The pitch of the third convex ridge 1171 can be L1 = 40 mm, 42 mm, 45 mm, 48 mm, 50 mm, 52 mm, 55 mm, 58 mm, 60 mm, etc.

[0184] The pitch of the fourth ridge 1271 is the same as the pitch of the third ridge 1171 .

[0185] 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 materials can be quickly conveyed toward the first mixing unit 111 and the second mixing unit 121, thereby improving production efficiency.

[0186] Please refer to Figure 2 and Figure 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 pressure-building unit 115 and the fourth pressure-building unit 125 are used to pre-knead the material and the 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.

[0187] Along the feeding direction of the feeding 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 .

[0188] 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 beneficial to uniformly mix the material and the slurry.

[0189] Please refer to Figure 2 and Figure 3 In some embodiments, the barrel includes a slurry inlet, and 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.

[0190] The slurry inlet is an opening for supplying slurry into the feed channel.

[0191] 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 .

[0192] Along the conveying direction of the conveying channel, the material inlet, the slurry inlet and the outlet are arranged in sequence.

[0193] 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 115 and the fourth pressure building unit 125, which is conducive to uniform mixing of the material and the slurry.

[0194] Please refer to Figure 2 and Figure 3 In some embodiments, the first screw 110 includes a seventh conveying unit 118, which is located downstream of the third mixing unit 117 and upstream of the third pressure building unit 115 along the conveying direction of the conveying channel. The second screw 120 includes an eighth conveying unit 128, which is located downstream of the fourth mixing unit 127 and upstream of the fourth pressure building unit 125 along the conveying direction of the conveying channel. The seventh conveying unit 118 and the eighth conveying unit 128 are both arranged corresponding to the slurry inlet.

[0195] Along the conveying direction of the material 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 .

[0196] 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 .

[0197] Please refer to Figure 4 , Figure 4 Schematic diagram of the structure of the pole piece manufacturing device 10 provided in other embodiments of the present application. In other embodiments, the pole piece manufacturing device 10 includes a cache mechanism 130, which is located downstream of the first extrusion mechanism 100 and upstream of the second extrusion mechanism 200. The cache mechanism 130 is used to cache the agglomerated material 500.

[0198] The buffer mechanism 130 is a mechanism for buffering the mass material 500. The buffer mechanism 130 is located between the first extrusion mechanism 100 and the second extrusion mechanism 200. The mass material 500 extruded by the first extrusion mechanism 100 enters the buffer mechanism 130 for buffering and is supplied to the second extrusion mechanism 200.

[0199] If the extrusion amount of the second extrusion mechanism 200 is too large, the blank 600 is extruded too much, and redundant material is likely to appear. When the thinning and forming film 700 is performed, the film 700 is likely to deviate. If the extrusion amount of the second extrusion mechanism 200 is too small, the blank 600 is extruded too little, and the blank 600 or the film 700 is likely to be broken. By setting the buffer mechanism 130 to buffer the agglomerated material 500 and controlling the feed of the second extrusion mechanism 200, the extrusion amount of the second extrusion mechanism 200 is controlled, so that the extrusion amount of the second extrusion mechanism 200 is within a preset range.

[0200] Please refer to Figure 4 and Figure 5 , Figure 5 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 material level detection mechanism 132. The storage bin 131 is used to buffer the agglomerate 500. The material level detection mechanism 132 is used to detect the material level of the agglomerate 500 in the storage bin 131, and the first extrusion mechanism 100 responds to the material level detection mechanism 132.

[0201] The storage bin 131 is a silo structure for temporarily storing the agglomerate 500. The storage bin 131 has an inlet and an outlet. The agglomerate 500 can enter the storage bin 131 through the inlet and be buffered in the storage bin 131. The agglomerate 500 can also leave the storage bin 131 through the outlet and be supplied to the second extrusion mechanism 200. Optionally, the storage bin 131 is a hopper so that the agglomerate 500 flows to the second extrusion mechanism 200 under the action of gravity.

[0202] The material level detection mechanism 132 is a mechanism for detecting the material level of the agglomerated material 500 in the material 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 material storage bin 131 .

[0203] 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.

[0204] The storage bin 131 can cache 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 means that there are too many agglomerates 500, and the extrusion amount of the first extrusion mechanism 100 can be reduced. When the material level in the storage bin 131 is low, it means that there are too few agglomerates 500, and the extrusion amount of the first extrusion mechanism 100 can be increased. In this way, negative feedback regulation is formed, which is conducive to the continuous automatic production of the pole piece 900.

[0205] Please refer to Figure 4 and Figure 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 used to emit detection light, and the light receiver 1322 is used to receive the detection light. The light emitter 1321 and the light receiver 1322 are arranged opposite to each other. The first extrusion mechanism 100 responds to the light receiver 1322.

[0206] The light transmitter 1321 is a component capable of emitting detection light, such as a laser transmitter. The light receiver 1322 is a component capable of receiving detection light, such as a laser receiver. The light receiver 1322 generates a first potential signal when receiving the detection light, and generates a second potential signal when not receiving the detection light, and the first potential signal and the second potential signal are different. According to the changes in the two potential signals, it can be determined whether the agglomerate 500 blocks the detection light, and then the material level of the agglomerate 500 in the storage bin 131 can be detected.

[0207] When the material level in the storage bin 131 is low, the agglomerated material 500 cannot block the light receiver 1322, and the light receiver 1322 can receive the detection light emitted by the light transmitter 1321. When the material level in the storage bin 131 is high, the agglomerated material 500 blocks the light receiver 1322, and the light receiver 1322 cannot receive the detection light emitted by the light transmitter 1321. The material level of the agglomerated 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.

[0208] 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.

[0209] In other embodiments, the material level detection mechanism 132 may also use current response feedback, sonar, etc.

[0210] In some embodiments, the second extrusion mechanism 200 is a single screw extruder.

[0211] The single-screw extruder has a strong pressure-building capability, which can break the voids in the mass material and drive the material into the space occupied by the voids, thereby obtaining a uniform rough material 600 , and the thinned and formed diaphragm 700 has good lateral consistency, which is conducive to controlling the thickness and uniformity of the formed diaphragm 700 .

[0212] Please refer to Figure 4 and Figure 5 In some embodiments, the film forming mechanism 300 includes a rolling mechanism, which is used to roll the blank 600 to thin the blank 600 into a film sheet 700 .

[0213] 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.

[0214] By rolling the blank 600 with a rolling mechanism, the blank 600 is thinned and formed into a diaphragm 700, which has high efficiency and good uniformity.

[0215] Please refer to Figure 4 and Figure 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.

[0216] The rolling mechanism may include two pressing rollers 310 , three pressing rollers 310 , four pressing rollers 310 , or more than four pressing rollers 310 .

[0217] “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 so as to reduce the thickness of the blank 600 to be equal to the width of the rolling gap.

[0218] 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 .

[0219] Please refer to Figure 4 and Figure 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, and 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.

[0220] The first pressing roller 311 specifically refers to a pressing roller 310 located at the end along the conveying direction of the blank 600 among the multiple pressing rollers 310. Figure 4 , Figure 4 The middle rolling mechanism includes two pressing rollers 310. At this time, the blank 600 can be wound in any direction after passing through the rolling gap, so any one of the two pressing rollers 310 can be used as the first pressing roller 311. Optionally, the rolling mechanism includes four pressing rollers 310, and the four pressing rollers 310 are arranged in sequence from left to right. From left to right, the blank 600 passes through the rolling gap formed between the first pressing roller 310 and the second pressing roller 310, the rolling gap formed between the second pressing roller 310 and the third pressing roller 310, and the rolling gap formed between the third pressing roller 310 and the fourth pressing roller 310 in sequence. At this time, the fourth pressing roller 310 is the pressing roller 310 located at the end of the multiple pressing rollers 310, that is, the fourth pressing roller 310 is the first pressing roller 311.

[0221] The composite roller 410 is a roller structure for composite film 700 and substrate 800. The composite roller 410 cooperates with the first pressing roller 311 to composite film 700 and substrate 800, which can reduce the number of composite rollers 410. Of course, in other embodiments, the composite mechanism 400 may include multiple composite rollers 410, and the multiple composite rollers 410 cooperate to roll the film 700 and substrate 800 to composite the film 700 and substrate 800.

[0222] 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 a 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 achieves two functions, thereby simplifying the structure of the pole piece manufacturing device 10 and reducing the cost of the pole piece manufacturing device 10.

[0223] Please refer to Figure 6 , Figure 6 The schematic diagram of the structure of the pole piece manufacturing device 10 provided in some other embodiments of the present application. In some other embodiments, the pole piece 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.

[0224] The premixing mechanism 140 is a mechanism for premixing 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.

[0225] 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 by the first extrusion mechanism 100 and the second extrusion mechanism 200, and the quality of the molded diaphragm 700 will be better, which is beneficial to improving the performance of the electrode 900.

[0226] Please refer to Figure 7 , Figure 7 The 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 arranged downstream of the film forming mechanism 300, and is used to dry the electrode 900.

[0227] By providing the drying mechanism 150 to dry the electrode piece 900, it is beneficial to quickly evaporate the moisture of the electrode piece 900, so that the electrode piece 900 is dried and shaped, thereby ensuring the performance of the electrode piece 900. In addition, the electrode piece 900 manufactured by the electrode piece manufacturing device 10 can be transported by the roller 210, and a winding type and folding type structure oven can be used, thereby shortening the length of the oven, reducing the floor space of the equipment, and reducing the production cost.

[0228] Please refer to Figure 8 , Figure 8 The schematic diagram of the structure of the 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 arranged downstream of the film forming mechanism 300, and the winding mechanism 160 is used to wind up the pole piece 900.

[0229] 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.

[0230] By providing the winding mechanism 160 , the pole piece 900 can be quickly wound up, making it convenient to store and transport the pole piece 900 .

[0231] Please refer to Fig. 9 , Fig. 9 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, and the first extrusion mechanism 100, the second extrusion mechanism 200 and the film forming mechanism 300 correspond one to one. The compounding mechanism 400 is used to compound the film 700 formed by the two film forming mechanisms 300 on both sides of the substrate 800 to form a pole piece 900.

[0232] By setting 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 active material layers on both sides of the substrate 800 at one time.

[0233] Please refer to Fig.10 , Fig.10 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, the pole piece manufacturing method 11 comprising:

[0234] Step S1: Extruding the material and the slurry into a mass 500;

[0235] Step S2: Extruding the mass material 500 into a blank material 600;

[0236] Step S3: thinning the blank 600 to form a diaphragm 700;

[0237] Step S4: Compounding the membrane 700 and the substrate 800 to form the pole piece 900 .

[0238] Please refer to Fig.11 , Fig.11 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 agglomerated material 500 is extruded into a blank material 600, the pole piece manufacturing method 11 further includes:

[0239] Step S5: Buffering the mass material 500.

[0240] In step S5 , the slug 500 may 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 supplied to the second extrusion mechanism 200 .

[0241] If the blank 600 is extruded too much, redundant material is likely to appear, and the diaphragm 700 is likely to deviate when thinning and forming the diaphragm 700. If the blank 600 is extruded too little, the blank 600 or the diaphragm 700 is likely to be broken. By buffering the mass material 500, the extrusion amount of the blank 600 is controlled within a preset range, so that the diaphragm 700 has a better molding quality.

[0242] According to some embodiments of this application, please refer to Figures 1 to 9 .

[0243] 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 the slurry into a mass 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 mass 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 diaphragm 700. The compounding mechanism 400 is arranged downstream of the film forming mechanism 300, and the compounding mechanism 400 is used to compound the diaphragm 700 and the substrate 800 to form a pole piece 900. The pole piece manufacturing device 10 extrude the material and the slurry into a mass material 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 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 pole piece manufacturing device 10 is used to manufacture the pole piece 900, the uniformity of the active material layer is good, the pole piece 900 has excellent performance, and the manufacturing efficiency is high.

[0244] The first extrusion mechanism 100 includes a barrel, 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 arranged in the feed channel. The first screw 110 and the second screw 120 are used to cooperate in extruding materials and slurry, and convey the materials and slurry to the outlet to form a mass material 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 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 the slurry. The first conveying unit 112 and the second conveying unit 122 are used to convey the material and the 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 the slurry to form a mass 500. When the first screw 110 and the second screw 120 rotate, the screw ridges on the first screw 110 and the second screw 120 will produce a shearing effect on the material and the slurry, thereby mixing the material and the slurry evenly. At the same time, the screw ridges on the first screw 110 and the second screw 120 will also transport the material and the slurry, so that the material and the slurry move toward the outlet and are extruded near the outlet to form a mass 500. The first screw 110 and the second screw 120 are respectively provided with a first mixing unit 111 and a second mixing unit 121, which can cooperate to disperse and knead the material and the slurry, so that the material and the slurry are evenly mixed. The first conveying unit 112 and the second conveying unit 122 can convey the material and the 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 can squeeze the material and the slurry, discharge the air in the material, make the material more dense and uniform, and thus shape the material and the slurry into a mass 500.

[0245] 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 by 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.

[0246] The first screw 110 includes a third pressure-building unit 115, and the third pressure-building unit 115 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, and the fourth pressure-building unit 125 is located upstream of the second mixing unit 121 along the conveying direction of the feed channel. The third pressure-building unit 115 and the fourth pressure-building unit 125 are used to pre-knead the material and the 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 mixing unit 117 and the fourth mixing unit 127 quickly transport the material entering the feed channel toward the third pressure-building unit 115 and the fourth pressure-building unit 125, and 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 mixing the material and the slurry evenly.

[0247] The barrel includes a material inlet, and the first screw 110 includes a third banburying unit 117. Along the conveying direction of the feed channel, the third banburying unit 117 is located upstream of the first banburying unit 111. The second screw 120 includes a fourth banburying unit 127. Along the conveying direction of the feed channel, the fourth banburying unit 127 is located upstream of the second banburying unit 121. The third banburying unit 117 and the fourth banburying unit 127 are arranged corresponding to the material inlet, and the third banburying unit 117 and the fourth banburying unit 127 are used to convey materials. The third banburying unit 117 and the fourth banburying unit 127 are mainly used to convey materials, and the materials entering the feed channel from the material inlet are quickly conveyed toward the first banburying unit 111 and the second banburying unit 121, so that the first banburying unit 111 and the second banburying unit 121 can disperse and knead the materials and slurry to improve production efficiency.

[0248] 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 agglomerate 500. If the extrusion amount of the second extrusion mechanism 200 is too large, the blank 600 is extruded too much, and redundant material is likely to appear. When the thinning and forming diaphragm 700 is formed, the diaphragm 700 is likely to deviate. If the extrusion amount of the second extrusion mechanism 200 is too small, the blank 600 is extruded too little, and the blank 600 or the diaphragm 700 is likely to 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 is controlled, so that the extrusion amount of the second extrusion mechanism 200 is within a preset range.

[0249] The pole piece 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. By arranging the premixing mechanism 140 to premix materials, the materials have better uniformity before entering the first extrusion mechanism 100, so that the materials have better uniformity after being extruded and molded by the first extrusion mechanism 100 and the second extrusion mechanism 200, and the quality of the molded diaphragm 700 is better, which is conducive to improving the performance of the pole piece 900.

[0250] The electrode manufacturing device 10 includes a drying mechanism 150, which is arranged downstream of the film forming mechanism 300, and is used to dry the electrode 900. By setting the drying mechanism 150 to dry the electrode 900, it is beneficial to quickly evaporate the moisture of the electrode 900, so that the electrode 900 is dried and shaped, thereby ensuring the performance of the electrode 900. In addition, the electrode 900 manufactured by the electrode manufacturing device 10 can be transported by the roller 210, and a winding type and folding type structure oven can be used, thereby shortening the length of the oven, reducing the floor space of the equipment, and reducing the production cost.

[0251] 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. By providing the winding mechanism 160, the pole piece 900 can be quickly wound up, and the pole piece 900 can be conveniently stored and transported.

[0252] The embodiment of the present application also provides a pole piece manufacturing method 11, which includes extruding a material and a slurry into a mass material 500; extruding the mass material 500 into a blank material 600; thinning the blank material 600 into a diaphragm 700; and compounding the diaphragm 700 with a substrate 800 to form a pole piece 900.

[0253] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0254] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pole piece manufacturing device, characterized in that: include: The first extrusion mechanism is used to extrude the material and slurry into a mass-shaped material; A second extrusion mechanism is disposed downstream of the first extrusion mechanism, and the second extrusion mechanism is used 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 claim 3, characterized in that: 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 claim 3, characterized in that: 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 claim 3, characterized in that: 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 claim 3, characterized in that: 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.

11. The pole piece manufacturing device according to claim 10, characterized in that: 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, characterized in that: 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, characterized in that: 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 claim 3, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The pitch of the third convex ridge is L1, which satisfies: 40mm≤L1≤60mm.

19. The pole piece manufacturing device according to claim 14, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 20, characterized in that: The second extrusion mechanism is a single screw extruder.

25. The pole piece manufacturing device according to any one of claims 1 to 20, characterized in that: 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 20, characterized in that: 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 20, characterized in that: 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 20, characterized in that: 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, characterized in that: 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 pole piece manufacturing method according to claim 29, characterized in that: Before the agglomerated material is extruded into a blank material, the pole piece manufacturing method further comprises: The mass is buffered.

Images