Pole manufacturing equipment

Abstract

The present application provides a pole piece manufacturing device, which relates to the field of batteries. The pole piece manufacturing device includes an extrusion mechanism, a straightening mechanism, a film forming mechanism and a compounding mechanism. The extrusion mechanism is used to extrude the material into a blank. The straightening mechanism is arranged downstream of the extrusion mechanism, and the straightening mechanism is used to straighten the blank. The film forming mechanism is arranged downstream of the straightening mechanism, and the film forming mechanism is used to thin the blank into a membrane. The compounding mechanism is arranged downstream of the membrane forming mechanism, and the compounding mechanism is used to compound the membrane with a substrate to form a pole piece. The material is extruded into a blank by the extrusion mechanism, so that the powder and particles in the material can be mixed evenly. The straightening mechanism straightens the blank, which is beneficial to improving the lateral consistency of the blank. The blank is formed into a membrane by the membrane forming mechanism, which is beneficial to controlling the thickness and uniformity of the formed membrane. When the pole piece is manufactured by the pole piece manufacturing device, the uniformity of the active material layer is good and the manufacturing efficiency is high.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a pole piece manufacturing device. Background Art

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

[0003] Currently, the manufacturing of pole pieces is mainly divided into wet technology and dry technology. However, the performance of pole pieces manufactured by dry technology is often poor. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a pole piece manufacturing device, which aims to improve the problem that the performance of pole pieces manufactured by dry technology in related technologies is often poor.

[0005] An embodiment of the present application provides a pole piece manufacturing device, which includes an extrusion mechanism, a straightening mechanism, a film forming mechanism and a compounding mechanism. The extrusion mechanism is used to extrude the material into a blank; the straightening mechanism is arranged downstream of the extrusion mechanism, and the straightening mechanism is used to straighten the blank; the film forming mechanism is arranged downstream of the straightening mechanism, and the film forming mechanism is used to thin the blank into a membrane; the compounding mechanism is arranged downstream of the membrane forming mechanism, and the compounding mechanism is used to compound the membrane and the substrate to form a pole piece.

[0006] In the above technical solution, the electrode manufacturing device extrude the material into a blank through an extrusion mechanism, so that the powder and particles in the material can be mixed evenly. The blank is straightened by a straightening mechanism, so that the material will move from the position where the extrusion mechanism discharges faster to the position where the discharge is slower along the width direction of the blank, thereby improving the lateral consistency of the blank, making the end face of the blank relatively flat, and the material is not easy to accumulate in the membrane forming mechanism. The blank is then formed into a membrane by a membrane forming mechanism, which is beneficial to controlling the thickness and uniformity of the formed membrane compared to directly forming the active material powder and particles into a membrane. Finally, the membrane and the substrate are compounded by a compounding mechanism to form a pole piece. When the pole piece is manufactured using this 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 straightening mechanism includes a first roller and a driving mechanism, the first roller is used to convey the blank; the driving mechanism is connected to the first roller, and the driving mechanism is used to drive the first roller to rotate and / or move to straighten the blank.

[0008] In the above technical solution, the blank can be wound around a first roller, and the drive mechanism drives the first roller to rotate. The rotation speed of the first roller is adjusted so that the linear velocity at any point on the circumference of the first roller is greater than the speed at which the blank is extruded by the extrusion mechanism. This can apply a certain tension to the blank, thereby straightening the blank. Alternatively, the drive mechanism can also drive the first roller to move, thereby applying a certain tension to the blank, thereby straightening the blank.

[0009] As an optional technical solution of an embodiment of the present application, the straightening mechanism includes a second roller, and a gap is formed between the first roller and the second roller for the blank to pass through.

[0010] In the above technical solution, the first roller and the second roller can cooperate to convey the blank to clamp the blank, thereby reducing the risk of slipping between the blank and the first roller, or between the blank and the second roller.

[0011] As an optional technical solution of an embodiment of the present application, the first roller is arranged at the outlet position of the extrusion mechanism.

[0012] In the above technical solution, by arranging the first roller at the outlet position of the extrusion mechanism, the blank extruded by the extrusion mechanism can be quickly straightened by the first roller, thereby improving the lateral consistency of the blank and reducing waste.

[0013] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device further includes a plurality of rollers, and the rollers are used to convey the blank.

[0014] In the above technical solution, a plurality of rollers are provided, which can support the blank and facilitate the conveyance of the blank to the film forming mechanism.

[0015] As an optional technical solution of an embodiment of the present application, along the conveying direction of the blank, the plurality of rollers are all located downstream of the first roller.

[0016] In the above technical solution, a plurality of rollers are arranged downstream of the first roller along the conveying direction, so as to facilitate conveying the stretched blank to the film forming mechanism while maintaining the stretched blank in a stretched state.

[0017] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device further includes a tension detection mechanism, which is used to detect the tension of the blank, and the extrusion mechanism responds to the tension detection mechanism.

[0018] In the above technical solution, a tension detection mechanism is set up to detect the tension of the blank material. The extrusion mechanism can speed up or slow down the extrusion speed of the blank material according to the detection result of the tension detection mechanism, thereby adjusting the tension of the blank material so that the tension of the blank material is within an appropriate range. In this way, the lateral consistency of the blank material is better, and the material is not easy to accumulate in the film forming mechanism.

[0019] As an optional technical solution of an embodiment of the present application, the tension detection mechanism is connected to the straightening mechanism, and the straightening mechanism responds to the tension detection mechanism.

[0020] In the above technical solution, both the straightening mechanism and the extrusion mechanism are responsive to the tension detection mechanism, which helps reduce the risk of the blank being broken. For example, when the tension of the blank needs to be increased, the extrusion speed of the extrusion mechanism can be reduced. If the straightening mechanism applies too much tension to the blank at this time, the blank may be broken. Therefore, the tension applied by the straightening mechanism can be appropriately reduced.

[0021] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device further includes a tension detection mechanism, which is used to detect the tension of the blank, and the straightening mechanism responds to the tension detection mechanism.

[0022] In the above technical solution, a tension detection mechanism is set up to detect the tension of the blank, and the straightening mechanism can adjust the tension of the blank according to the detection result of the tension detection mechanism, so that the tension of the blank is within an appropriate range. In this way, the lateral consistency of the blank is better, and the material is not easy to accumulate in the film forming mechanism.

[0023] As an optional technical solution of an embodiment of the present application, the straightening mechanism includes a first roller and a driving mechanism, the first roller is used to convey the blank; the driving mechanism is connected to the first roller, the driving mechanism responds to the tension detection mechanism, and the driving mechanism is used to drive the first roller to rotate and / or move to adjust the tension of the blank.

[0024] In the above technical solution, when the rotation speed of the first roller increases, the tension applied to the blank increases, making the blank straighter. When the rotation speed of the first roller decreases, the tension applied to the blank decreases. The drive mechanism can control the rotation speed of the first roller based on the detection results of the tension detection mechanism. In addition, the drive mechanism can control the movement of the first roller based on the detection results of the tension detection mechanism, thereby increasing or decreasing the tension applied to the blank.

[0025] As an optional technical solution of an embodiment of the present application, the tension detection mechanism includes a third roller and a detection unit, the third roller is used to convey the blank; the detection unit supports the third roller, and the detection unit is used to detect the tension of the blank.

[0026] In the above technical solution, the detection unit facilitates the measurement of the pressure applied by the blank to the third roller. The pressure applied by the blank to the third roller can be considered the resultant force of two components (tensions) of the blank on either side of the third roller. The detection unit can calculate the magnitude of the component forces (tensions) based on the pressure applied by the blank to the third roller and the angles between the two components and the pressure. Using this detection unit to measure tension provides accurate results and is cost-effective.

[0027] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device includes a fourth roller and a fifth roller, and along the conveying direction of the blank, the fourth roller, the third roller and the fifth roller are arranged in sequence.

[0028] In the above technical solution, by providing the fourth roller and the fifth roller, the angles between the two component forces and the pressure applied by the blank to the third roller are relatively stable, thereby improving the accuracy of the detection unit in tension detection.

[0029] As an optional technical solution of an embodiment of the present application, the film forming mechanism is arranged downstream of the fifth roller.

[0030] In the above technical solution, the tension of the blank has been controlled within an appropriate range before the fifth roller, and the lateral consistency of the blank is good. Therefore, setting a film forming mechanism after the fifth roller is beneficial to improving the quality of the formed film.

[0031] As an optional technical solution of an embodiment of the present application, the pole piece manufacturing device includes two fifth rollers, and a feeding gap for the blank to pass through is formed between the two fifth rollers; the film forming mechanism includes two pressing rollers, and a rolling gap for the blank to pass through is formed between the two pressing rollers; the feeding gap is at least partially opposite to the rolling gap.

[0032] In the above technical solution, the use of two fifth rollers to convey the blank reduces the risk of the blank slipping between the fifth rollers. The two pressing rollers cooperate to compress the blank, facilitating its formation into a film. By arranging the feed gap and the pressing gap at least partially opposite each other, the blank, after passing through the feed gap, can enter the pressing gap with minimal or no bending, thereby improving the quality of the film after pressing.

[0033] As an optional technical solution of an embodiment of the present application, a perpendicular bisector of a line connecting the centers of the two fifth rollers coincides with a perpendicular bisector of a line connecting the centers of the two pressing rollers.

[0034] In the above technical solution, by making the perpendicular bisector of the line connecting the centers of the two fifth rollers coincide with the perpendicular bisector of the line connecting the centers of the two pressing rollers, the blank can enter the rolling gap without further bending after passing through the feeding gap, which is beneficial to improving the quality of the membrane after rolling.

[0035] As an optional technical solution of an embodiment of the present application, the film forming mechanism includes a rolling mechanism, which is used to roll the blank to thin the blank into a film.

[0036] In the above technical solution, the blank is thinned and formed into a diaphragm by rolling the blank with a rolling mechanism, which has high efficiency and good uniformity.

[0037] As an optional technical solution of an embodiment of the present application, the rolling mechanism includes a plurality of pressing rollers, and a rolling gap for the blank to pass through is formed between two adjacent pressing rollers.

[0038] In the above technical solution, by setting up multiple pressing rollers, the multiple pressing rollers can gradually thin the blank to form a membrane, and the degree of thinning each time will not be too large, which is conducive to improving the uniformity and thickness consistency of the membrane.

[0039] As an optional technical solution of an embodiment of the present application, along the conveying direction of the blank, the pressure roller located at the end of the multiple pressure rollers is the first pressure roller, and the composite mechanism includes a composite roller, and a composite gap is formed between the composite roller and the first pressure roller for the diaphragm and the substrate to pass through.

[0040] In the above technical solution, the composite roller cooperates with the first pressing roller to roll the diaphragm and the substrate to composite the diaphragm and the substrate into a pole piece. The first pressing roller serves as both a component for rolling the blank and a component for composite diaphragm and substrate. One component realizes two functions, simplifies the structure of the pole piece manufacturing device, and reduces the cost of the pole piece manufacturing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A schematic block diagram of a pole piece manufacturing apparatus provided in some embodiments of the present application;

[0043] Figure 2 A schematic structural diagram of a pole piece manufacturing device provided in some embodiments of the present application;

[0044] Figure 3 A schematic structural diagram of a straightening mechanism provided in some embodiments of the present application;

[0045] Figure 4 A schematic structural diagram of a pole piece manufacturing device provided in other embodiments of the present application;

[0046] Figure 5 A schematic structural diagram of a straightening mechanism provided in other embodiments of the present application;

[0047] Figure 6 A schematic structural diagram of a pole piece manufacturing device provided in some other embodiments of the present application;

[0048] Figure 7 A schematic structural diagram of a pole piece manufacturing device provided in some embodiments of the present application;

[0049] Figure 8 A schematic structural diagram of a pole piece manufacturing device provided in some other embodiments of the present application;

[0050] Figure 9 A schematic block diagram of the connection between a tension detection mechanism and an extrusion mechanism provided in some embodiments of the present application;

[0051] Figure 10 A schematic block diagram showing the connection between a tension detection mechanism provided in some embodiments of the present application and an extrusion mechanism and a straightening mechanism;

[0052] Figure 11 A schematic block diagram of the connection between a tension detection mechanism and a straightening mechanism provided in some embodiments of the present application;

[0053] Figure 12 Schematic diagram of the tension detection principle provided in some embodiments of the present application.

[0054] Icons: 10-pole piece manufacturing device; 100-extrusion mechanism; 110-mounting frame; 200-straightening mechanism; 210-first roller; 220-driving mechanism; 230-second roller; 250-pass roller; 251-third roller; 252-fourth roller; 253-fifth roller; 300-film forming mechanism; 310-pressing roller; 311-first pressing roller; 400-combining mechanism; 410-combining roller; 500-tension detection mechanism; 510-detection unit; 600-blank material; 700-diaphragm; 800-substrate; 900-pole piece. DETAILED DESCRIPTION

[0055] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0057] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0058] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0059] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0060] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0061] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0062] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0063] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0064] Batteries include electrode assemblies, the components where electrochemical reactions occur. Electrode assemblies are primarily composed of wound or stacked positive and negative electrode sheets. Electrode sheet manufacturing is primarily done using wet and dry processes. However, dry-processed electrode sheets often exhibit poor performance.

[0065] When manufacturing pole pieces using dry process technology, active material powder and granules are fed onto the surface of a roller, where they are directly rolled into a film. This method of forming a film makes it difficult to guarantee uniform thickness. The thickness uniformity of the active material layer in pole pieces produced using this method is poor, resulting in poor performance.

[0066] In view of this, an embodiment of the present application provides a pole piece manufacturing device, comprising an extrusion mechanism, a straightening mechanism, a film forming mechanism, and a laminating mechanism. The extrusion mechanism is used to extrude a material into a blank. The straightening mechanism is disposed downstream of the extrusion mechanism and is used to straighten the blank. The film forming mechanism is disposed downstream of the straightening mechanism and is used to thin the blank into a membrane. The laminating mechanism is disposed downstream of the membrane forming mechanism and is used to laminate the membrane with a substrate to form the pole piece.

[0067] The electrode manufacturing device uses an extrusion mechanism to extrude the material into a blank, so that the powder and particles in the material can be mixed evenly. The blank is straightened by a straightening mechanism, so that the material will move from the position where the extruder discharges faster to the position where the discharge is slower along the width direction of the blank, thereby improving the lateral consistency of the blank, making the end face of the blank relatively flat, and the material is not easy to accumulate in the membrane forming mechanism. The blank is then formed into a membrane by a membrane forming mechanism. Compared with directly forming the active material powder and particles into a membrane, it is beneficial to control the thickness and uniformity of the formed membrane. Finally, the membrane and the substrate are compounded by a compounding mechanism to form the electrode. When the electrode manufacturing device is used to manufacture the electrode, the uniformity of the active material layer is good, the electrode performance is excellent, and the manufacturing efficiency is high.

[0068] The technical solution described in the embodiments of this application is applicable to the manufacture of pole pieces.

[0069] 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 2 A schematic structural diagram of a pole piece manufacturing device 10 provided for some embodiments of the present application. An embodiment of the present application provides a pole piece manufacturing device 10, which includes an extrusion mechanism 100, a straightening mechanism 200, a film forming mechanism 300, and a compounding mechanism 400. The extrusion mechanism 100 is used to extrude the material into a blank 600. The straightening mechanism 200 is arranged downstream of the extrusion mechanism 100, and the straightening mechanism 200 is used to straighten the blank 600. The film forming mechanism 300 is arranged downstream of the straightening mechanism 200, and the film forming mechanism 300 is used to thin the blank 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.

[0070] The extrusion mechanism 100 is a mechanism capable of performing an extrusion molding process. The extrusion mechanism 100 can be used to extrude the active material into a blank 600, thereby ensuring uniform mixing of the active material. The 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.

[0071] The material refers to a mixture of active material powder and active material particles. Optionally, the material also includes a solvent in which the active material powder and active material particles are soluble, thereby facilitating uniform mixing. To further enhance the performance of the membrane 700, the proportion of active material powder and / or active material particles can be increased to produce an active material with a high solid content.

[0072] The blank 600 is the product of the active material after extrusion molding. The blank 600 is thick, self-supporting, and not easy to break. The thickness of the blank 600 is generally 1 to 10 mm.

[0073] The straightening mechanism 200 is a structure used to apply a certain tension to the blank 600 to straighten it. Along the width direction of the blank 600, the extrusion mechanism 100 may discharge material faster at some locations and slower at others. This will cause unevenness to appear on the end face of the blank 600, and the lateral consistency of the blank 600 will be poor. Material flowing out from the faster discharge location is also likely to accumulate on the film forming mechanism 300, affecting the film forming mechanism 300. The straightening mechanism 200 can straighten the blank 600. In this way, the material will move from the faster discharge location of the extrusion mechanism 100 toward the slower discharge location along the width direction of the blank 600, thereby improving the lateral consistency of the blank 600, making the end face of the blank 600 relatively flat, and preventing material from accumulating on the film forming mechanism 300.

[0074] The membrane forming mechanism 300 is used to thin the blank 600 into a membrane sheet 700. Because the blank 600 is relatively thick and cannot be directly laminated with the substrate 800, the membrane forming mechanism 300 thins the blank 600 to form the membrane sheet 700. The membrane sheet 700, thinned and formed by the membrane forming mechanism 300, has a more uniform distribution of active material and thickness, which improves the quality of the electrode sheet 900.

[0075] The composite structure 400 combines the membrane 700 and substrate 800 to form the electrode 900. From the perspective of the electrode 900, the membrane 700 is the active material layer of the electrode 900, and the substrate 800 is the current collector of the electrode 900. The substrate 800 of the positive electrode electrode 900 can be aluminum, and the active material of the positive electrode electrode 900 can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The substrate 800 of the negative electrode electrode 900 can be copper, and the active material of the negative electrode electrode 900 can be carbon or silicon.

[0076] The electrode manufacturing device 10 extrude the material into a blank 600 through the extrusion mechanism 100, so that the powder and particles in the material can be mixed evenly. The blank 600 is straightened by the straightening mechanism 200. In this way, the material will move from the position where the extrusion mechanism 100 discharges the material faster to the position where the material discharges the material slower along the width direction of the blank 600, thereby improving the lateral consistency of the blank 600, making the end face of the blank 600 relatively flat, and the material is not easy to accumulate in the membrane forming mechanism 300. The blank 600 is then formed into a membrane 700 by the membrane forming mechanism 300. Compared with directly forming the active material powder and particles into the membrane 700, it is beneficial to control the thickness and uniformity of the formed membrane 700. Finally, the membrane 700 and the substrate 800 are compounded by the compounding mechanism 400 to form the electrode 900. 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.

[0077] Please refer to Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of the structure of a straightening mechanism 200 provided in some embodiments of the present application. In some embodiments, the straightening mechanism 200 includes a first roller 210 and a drive mechanism 220. The first roller 210 is used to convey the blank 600. The drive mechanism 220 is connected to the first roller 210 and is used to drive the first roller 210 to rotate to straighten the blank 600.

[0078] The first roller 210 is a roller structure, and the blank 600 can be partially attached to the circumference of the first roller 210. As the first roller 210 rotates, the blank 600 can be transported.

[0079] The drive mechanism 220 may include a rotary drive member connected to the first roller 210, which outputs rotational motion, thereby driving the first roller 210 to rotate. The rotary drive member may be a motor, an internal combustion engine, or the like. The drive mechanism 220 may also include a linear drive member and a transmission mechanism. The transmission mechanism connects the linear drive member and the first roller 210, and the linear drive member outputs linear motion, which is then converted into rotational motion of the first roller 210. The linear drive member may be a linear electric cylinder, a linear oil cylinder, a linear pneumatic cylinder, or the like. The transmission mechanism may be a crank slider mechanism, a ball screw mechanism, or the like.

[0080] The blank 600 can be wound around the first roller 210, and the driving mechanism 220 drives the first roller 210 to rotate. The rotation speed of the first roller 210 is adjusted so that the linear velocity of any point on the circumference of the first roller 210 is greater than the speed at which the extrusion mechanism 100 extrude the blank 600, thereby giving the blank 600 a certain tension, thereby straightening the blank 600.

[0081] Please refer to Figure 4 and Figure 5 , Figure 4 Schematic diagram of the structure of the electrode manufacturing device 10 provided in other embodiments of the present application. Figure 5 Schematic diagram of the structure of the straightening mechanism 200 provided in some other embodiments of the present application. In some other embodiments, the straightening mechanism 200 includes a second roller 230, and a gap is formed between the first roller 210 and the second roller 230 for the blank 600 to pass through.

[0082] The second roller 230 can be an active roller, that is, the second roller 230 can be rotated under the drive of the driving mechanism. The driving mechanism 220 can simultaneously drive the first roller 210 and the second roller 230 to rotate. Of course, other driving mechanisms can also be set separately to drive the second roller 230 to rotate.

[0083] The second roller 230 may also be a driven roller, that is, the second roller 230 is not driven by a driving mechanism, and the second roller 230 can rotate under the action of the blank 600 .

[0084] The first roller 210 and the second roller 230 are arranged opposite to each other, and the first roller 210 and the second roller 230 cooperate to transport the blank 600.

[0085] The first roller 210 and the second roller 230 can cooperate to convey the blank 600 to clamp the blank 600 and reduce the risk of slipping between the blank 600 and the first roller 210 and between the blank 600 and the second roller 230 .

[0086] Please refer to Figure 6 , Figure 6 Schematic diagram of the structure of the electrode manufacturing apparatus 10 provided in some other embodiments of the present application. In some other embodiments, the straightening mechanism 200 includes a first roller 210 and a drive mechanism 220. The first roller 210 is used to convey the blank 600. The drive mechanism 220 is connected to the first roller 210 and is used to drive the first roller 210 to move to straighten the blank 600.

[0087] The drive mechanism 220 is used to move the first roller 210. The drive mechanism 220 may include a linear drive member connected to the first roller 210, which outputs linear motion, thereby driving the first roller 210 to move. The linear drive member may be a linear electric cylinder, a linear oil cylinder, a linear pneumatic cylinder, or the like. The drive mechanism 220 may also include a rotational drive member and a transmission mechanism. The transmission mechanism connects the rotational drive member and the first roller 210, the rotational drive member outputs rotational motion, and the transmission mechanism converts the rotational motion output by the rotational drive member into linear motion of the first roller 210. The rotational drive member may be a motor, an internal combustion engine, or the like. The transmission mechanism may be a slider-crank mechanism, a ball screw mechanism, or the like.

[0088] The blank 600 may be wound around the first roller 210 , and the driving mechanism 220 drives the first roller 210 to move, thereby applying a certain tension to the blank 600 and straightening the blank 600 .

[0089] Please refer again Figure 5 In some embodiments, the first roller 210 is disposed at an exit position of the extrusion mechanism 100 .

[0090] Please refer to Figure 5 A mounting bracket 110 may be provided at the exit of the extrusion mechanism 100 , and the extrusion mechanism 100 may be mounted on the mounting bracket 110 , so that the first roller 210 is located at the exit of the extrusion mechanism 100 .

[0091] Of course, the extrusion mechanism 100 and the first roller 210 may also be installed on the same frame, so that the first roller 210 is located at the exit of the extrusion mechanism 100 .

[0092] By arranging the first roller 210 at the outlet position of the extrusion mechanism 100 , the blank 600 extruded by the extrusion mechanism 100 can be quickly straightened by the first roller 210 , thereby improving the lateral consistency of the blank 600 and reducing waste.

[0093] Please refer to Figure 7 , Figure 7 Schematic diagram of the structure of the electrode manufacturing device 10 provided in some embodiments of the present application. In some other embodiments, the electrode manufacturing device 10 further includes a plurality of rollers 250 , which are used to convey the blank 600 .

[0094] The roller 250 is a roller structure, and the blank 600 can be partially attached to the circumference of the roller 250. As the roller 250 rotates, the blank 600 can be conveyed. The blank 600 can change its direction by passing through multiple rollers 250 in sequence.

[0095] By providing a plurality of rollers 250 , the plurality of rollers 250 can support the blank 600 , thereby facilitating the conveyance of the blank 600 to the film forming mechanism 300 .

[0096] Please refer to Figure 7 In some embodiments, along the conveying direction of the blank 600 , the plurality of rollers 250 are located downstream of the first roller 210 .

[0097] Along the conveying direction of the blank 600 , the first roller 210 is located upstream of the plurality of passing rollers 250 .

[0098] The plurality of rollers 250 are arranged downstream of the first roller 210 along the conveying direction, so as to facilitate conveying the stretched blank 600 to the film forming mechanism 300 while maintaining the stretched blank 600 in a stretched state.

[0099] Please refer to Figure 8 and Figure 9 , Figure 8 Schematic diagram of the structure of the electrode manufacturing device 10 provided in some other embodiments of the present application. Figure 9 This is a schematic block diagram of the connection between the tension detection mechanism 500 and the extrusion mechanism 100 provided in some embodiments of the present application. In other embodiments, the electrode manufacturing device 10 further includes a tension detection mechanism 500, which is used to detect the tension of the blank 600. The extrusion mechanism 100 responds to the tension detection mechanism 500.

[0100] The tension detection mechanism 500 is a structure for realizing tension detection of the blank 600. Figure 8 In some embodiments, the tension detection mechanism 500 is disposed downstream of the first roller 210 and upstream of the film forming mechanism 300. In other embodiments, the tension detection mechanism 500 may also be disposed downstream of the extrusion mechanism 100 and upstream of the first roller 210.

[0101] The tension detection mechanism 500 can be directly connected to the extrusion mechanism 100 for communication. For example, the tension detection mechanism 500 is connected to the extrusion mechanism 100 via a wired connection such as a wire or a network cable. In another example, the tension detection mechanism 500 is connected to the extrusion mechanism 100 via a wireless connection such as Bluetooth or a wireless network. The adjustment mechanism can also be indirectly electrically connected to the extrusion mechanism 100 via an intermediate component. For example, the intermediate component can be a controller, the tension detection mechanism 500 is electrically connected to the controller, and the controller is electrically connected to the extrusion mechanism 100. The controller receives the detection results of the tension detection mechanism 500 and controls the extrusion speed of the extrusion mechanism 100 based on the detection results, thereby controlling the tension of the blank 600 within a preset range.

[0102] By setting up a tension detection mechanism 500 to detect the tension of the blank 600, the extrusion mechanism 100 can speed up or slow down the extrusion speed of the blank 600 according to the detection result of the tension detection mechanism 500, thereby adjusting the tension of the blank 600 so that the tension of the blank 600 is within a suitable range. In this way, the lateral consistency of the blank 600 is better, and the material is not easy to accumulate in the film forming mechanism 300.

[0103] Please refer to Figure 10 , Figure 10 Schematic diagram of a tension detection mechanism 500 provided in some embodiments of the present application connected to the extrusion mechanism 100 and the straightening mechanism 200. In some embodiments, the tension detection mechanism 500 is connected to the straightening mechanism 200, and the straightening mechanism 200 responds to the tension detection mechanism 500.

[0104] The tension detection mechanism 500 can be directly connected to the straightening mechanism 200 for communication. For example, the tension detection mechanism 500 is connected to the straightening mechanism 200 via a wired connection such as a wire or a network cable. In another example, the tension detection mechanism 500 is connected to the straightening mechanism 200 via a wireless connection such as Bluetooth or a wireless network. The adjustment mechanism can also be indirectly electrically connected to the extrusion mechanism 100 via an intermediate component. For example, the intermediate component can be a controller, the tension detection mechanism 500 is electrically connected to the controller, and the controller is electrically connected to the straightening mechanism 200. The controller receives the detection results of the tension detection mechanism 500 and controls the operation of the straightening mechanism 200 based on the detection results, thereby controlling the tension of the blank 600 within a preset range.

[0105] Both the straightening mechanism 200 and the extrusion mechanism 100 are responsive to the tension detection mechanism 500, which helps reduce the risk of the blank 600 being broken. For example, when the tension of the blank 600 needs to be increased, the extrusion speed of the extrusion mechanism 100 can be reduced. If the straightening mechanism 200 applies a large tension to the blank 600 at this time, the blank 600 may be broken. Therefore, the tension applied to the blank 600 by the straightening mechanism 200 can be appropriately reduced.

[0106] Please refer to Figure 11 , Figure 11 This is a schematic block diagram illustrating the connection between a tension detection mechanism 500 and a straightening mechanism 200 provided in some embodiments of the present application. In some embodiments, the electrode manufacturing apparatus 10 further includes a tension detection mechanism 500, which is configured to detect the tension of the blank 600. The straightening mechanism 200 responds to the tension detection mechanism 500.

[0107] By setting up a tension detection mechanism 500 to detect the tension of the blank 600, the straightening mechanism 200 can adjust the tension of the blank 600 according to the detection result of the tension detection mechanism 500, so that the tension of the blank 600 is within a suitable range. In this way, the lateral consistency of the blank 600 is better, and the material is not easy to accumulate in the film forming mechanism 300.

[0108] In some embodiments, the straightening mechanism 200 includes a first roller 210 and a driving mechanism 220. The first roller 210 is used to convey the blank 600. The driving mechanism 220 is connected to the first roller 210 and is responsive to the tension detecting mechanism 500. The driving mechanism 220 is used to drive the first roller 210 to rotate to adjust the tension of the blank 600.

[0109] When the speed of the first roller 210 increases, the tension applied to the blank 600 increases, making the blank 600 straighter. When the speed of the first roller 210 decreases, the tension applied to the blank 600 decreases. The drive mechanism 220 can control the speed of the first roller 210 based on the detection results of the tension detection mechanism 500, thereby adjusting the tension of the blank 600 and keeping the tension of the blank 600 within a preset range.

[0110] In other embodiments, the straightening mechanism 200 includes a first roller 210 and a driving mechanism 220. The first roller 210 is used to convey the blank 600. The driving mechanism 220 is connected to the first roller 210 and is responsive to the tension detecting mechanism 500. The driving mechanism 220 is used to drive the first roller 210 to move so as to adjust the tension of the blank 600.

[0111] The drive mechanism 220 can control the movement of the first roller 210 based on the detection results of the tension detection mechanism 500, thereby increasing or decreasing the tension applied to the blank 600. For example, the drive mechanism 220 can drive the first roller 210 upward to increase the tension of the blank 600. The drive mechanism 220 can also drive the first roller 210 downward to decrease the tension of the blank 600, thereby controlling the tension of the blank 600 within a preset range.

[0112] Please refer to Figure 8 and Figure 12 , Figure 12 Schematic diagram of the tension detection principle provided in some embodiments of the present application. In some embodiments, the tension detection mechanism 500 includes a third roller 251 and a detection unit 510. The third roller 251 is used to convey the blank 600. The detection unit 510 supports the third roller 251 and is used to detect the tension of the blank 600.

[0113] The detection unit 510 is subjected to the gravity of the third roller 251 and the downward pressure of the blank 600 on the third roller 251 (such as Figure 12 Since the gravity of the third roller 251 is known, the downward pressure exerted by the blank 600 on the third roller 251 can be obtained (e.g., F2). Figure 12 The tension of the blank 600 can be calculated based on the pressure applied by the blank 600 to the third roller 251 (the tension of the blank 600 is as follows). Figure 12 F1 shown in , F1 = F2 / 2cosα).

[0114] The detection unit 510 facilitates the measurement of the pressure applied by the blank 600 to the third roller 251. The pressure applied by the blank 600 to the third roller 251 can be considered the resultant force of two components (tensions) of the blank 600 on either side of the third roller 251. The detection unit 510 can calculate the magnitude of the component forces (tensions) based on the pressure applied by the blank 600 to the third roller 251 and the angles between the two components and the pressure. Using the detection unit 510 to measure tension provides accurate results and is cost-effective.

[0115] Please refer again Figure 8 In some embodiments, the pole piece manufacturing device 10 includes a fourth roller 252 and a fifth roller 253. Along the conveying direction of the blank 600, the fourth roller 252, the third roller 251 and the fifth roller 253 are arranged in sequence.

[0116] The fourth roller 252 and the fifth roller 253 are both roller structures. The blank 600 passes through the fourth roller 252, the third roller 251 and the fifth roller 253 in sequence.

[0117] By providing the fourth roller 252 and the fifth roller 253 , the angles between the two force components and the pressure applied by the blank 600 to the third roller 251 are relatively stable, thereby improving the accuracy of the tension detection by the detection unit 510 .

[0118] Please refer to Figure 8 In some embodiments, the film forming mechanism 300 is disposed downstream of the fifth roller 253 .

[0119] Before the fifth roller 253 , the tension of the blank 600 has been controlled within an appropriate range, and the lateral consistency of the blank 600 is good. Therefore, arranging the film forming mechanism 300 after the fifth roller 253 is beneficial to improving the quality of the formed film 700 .

[0120] Please refer to Figure 8 In some embodiments, the electrode manufacturing apparatus 10 includes two fifth rollers 253, with a feed gap formed between the two fifth rollers 253 for the blank 600 to pass through. The film forming mechanism 300 includes two pressing rollers 310, with a rolling gap formed between the two pressing rollers 310 for the blank 600 to pass through. The feed gap and the rolling gap are at least partially opposite to each other.

[0121] The two fifth rollers 253 are arranged opposite to each other, and the two fifth rollers 253 can cooperate to convey the blank 600.

[0122] There is a rolling gap between the two pressing rollers 310 for the active material to pass through. When the blank 600 passes through the gap, it is squeezed by the two pressing rollers 310 and formed into a membrane 700.

[0123] The feeding gap can be partially opposite to the rolling gap, or the feeding gap can be completely opposite to the rolling gap.

[0124] The use of two fifth rollers 253 to convey the blank 600 helps reduce the risk of the blank 600 slipping between the fifth rollers 253. The two pressing rollers 310 cooperate to press the blank 600, facilitating the rolling of the blank 600 into a film 700. By arranging the feed gap and the rolling gap at least partially opposite each other, the blank 600, after passing through the feed gap, can enter the rolling gap with minimal or no bending, thereby improving the quality of the rolled film 700.

[0125] In some embodiments, the perpendicular bisector of the line connecting the centers of the two fifth rollers 253 coincides with the perpendicular bisector of the line connecting the centers of the two pressing rollers 310 .

[0126] The perpendicular bisector of the line connecting the centers of the two fifth rollers 253 is the first perpendicular bisector. The perpendicular bisector of the line connecting the centers of the two pressing rollers 310 is the second perpendicular bisector. The first perpendicular bisector and the second perpendicular bisector are substantially coincident. For example, the first perpendicular bisector and the second perpendicular bisector are parallel, and the distance between the first perpendicular bisector and the second perpendicular bisector is no greater than 0.5 mm.

[0127] The use of two fifth rollers 253 in conjunction with conveying the blank 600 helps reduce the risk of the blank 600 slipping between the fifth rollers 253. The two pressing rollers 310 cooperate to press the blank 600, facilitating rolling of the blank 600 into a film 700. By aligning the perpendicular midline of the line connecting the centers of the two fifth rollers 253 with the perpendicular midline of the line connecting the centers of the two pressing rollers 310, the blank 600 can enter the rolling gap after passing through the feeding gap without further bending, thereby improving the quality of the film 700 after rolling.

[0128] Please refer to Figure 8 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 700 .

[0129] 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.

[0130] By rolling the blank 600 with a rolling mechanism, the blank 600 is thinned and formed into the diaphragm 700, which has high efficiency and good uniformity.

[0131] Please refer to Figure 8In 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.

[0132] The rolling mechanism may include two pressing rollers 310 , three pressing rollers 310 , four pressing rollers 310 , or more than four pressing rollers 310 .

[0133] “A rolling gap is formed between two adjacent pressing rollers 310 for the blank 600 to pass through” means that the two adjacent pressing rollers 310 cooperate to roll the blank 600 to reduce the thickness of the blank 600 to be equal to the width of the rolling gap.

[0134] 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 .

[0135] Please refer to Figure 8 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.

[0136] 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 8 , Figure 8 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. Therefore, either of the two pressing rollers 310 can serve as the first pressing roller 311. Optionally, the rolling mechanism includes four pressing rollers 310, which are arranged sequentially from left to right. Counting from left to right, the blank 600 sequentially passes through the rolling gap formed between the first and second pressing rollers 310, the rolling gap formed between the second and third pressing rollers 310, and the rolling gap formed between the third and fourth pressing rollers 310. In this case, the fourth pressing roller 310 is the last pressing roller 310 among the multiple pressing rollers 310, that is, the fourth pressing roller 310 serves as the first pressing roller 311.

[0137] The laminating roller 410 is a roller structure used to laminarly laminate the film 700 and the substrate 800. The laminating roller 410 cooperates with the first pressing roller 311 to laminarly laminate the film 700 and the substrate 800, thereby reducing the number of laminating rollers 410 required. Of course, in other embodiments, the laminating mechanism 400 may include multiple laminating rollers 410, which cooperate to roll and press the film 700 and the substrate 800 to form a composite.

[0138] The composite roller 410 cooperates with the first pressing roller 311 to roll the diaphragm 700 and the substrate 800 to composite the diaphragm 700 and the substrate 800 into the pole piece 900. The first pressing roller 311 serves as both a component for rolling the blank 600 and a component for composite the diaphragm 700 and the substrate 800. One component realizes two functions, simplifies the structure of the pole piece manufacturing device 10, and reduces the cost of the pole piece manufacturing device 10.

[0139] According to some embodiments of this application, please refer to Figures 1 to 8 .

[0140] An embodiment of the present application provides a pole piece manufacturing device 10, which includes an extrusion mechanism 100, a straightening mechanism 200, a film forming mechanism 300, and a compounding mechanism 400. The extrusion mechanism 100 is used to extrude a material into a blank 600. The straightening mechanism 200 is arranged downstream of the extrusion mechanism 100, and the straightening mechanism 200 is used to straighten the blank 600. The film forming mechanism 300 is arranged downstream of the straightening mechanism 200, and the film forming mechanism 300 is used to thin the blank 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 extrudes the material into the blank 600 through the extrusion mechanism 100, so that the powder and particles in the material can be evenly mixed. The blank 600 is straightened by the straightening mechanism 200. In this way, the material will move from the position where the extrusion mechanism 100 discharges the material faster to the position where the material discharges the material slower along the width direction of the blank 600, thereby improving the lateral consistency of the blank 600, making the end face of the blank 600 relatively flat, and the material is not easy to accumulate in the membrane forming mechanism 300. The blank 600 is then formed into a membrane 700 by the membrane forming mechanism 300. Compared with directly forming the active material powder and particles into the membrane 700, it is beneficial to control the thickness and uniformity of the formed membrane 700. Finally, the membrane 700 and the substrate 800 are compounded by the compounding mechanism 400 to form the electrode 900. When the electrode manufacturing device 10 is used to manufacture the electrode 900, the uniformity of the active material layer is good, the performance of the electrode 900 is excellent, and the manufacturing efficiency is high.

[0141] The straightening mechanism 200 includes a first roller 210 and a drive mechanism 220. The first roller 210 is used to convey the blank 600. The drive mechanism 220 is connected to the first roller 210 and is used to drive the first roller 210 to rotate, thereby straightening the blank 600. The blank 600 can be wound around the first roller 210. The drive mechanism 220 drives the first roller 210 to rotate. The rotation speed of the first roller 210 is adjusted so that the linear velocity at any point on the circumference of the first roller 210 is greater than the speed at which the blank 600 is extruded by the extrusion mechanism 100. This applies a certain tension to the blank 600, thereby straightening the blank 600.

[0142] The electrode manufacturing device 10 further includes a tension detection mechanism 500, which is used to detect the tension of the blank 600. The extrusion mechanism 100 responds to the tension detection mechanism 500. By setting up the tension detection mechanism 500 to detect the tension of the blank 600, the extrusion mechanism 100 can speed up or slow down the extrusion speed of the blank 600 according to the detection result of the tension detection mechanism 500, thereby adjusting the tension of the blank 600 so that the tension of the blank 600 is within an appropriate range. In this way, the lateral consistency of the blank 600 is better, and the material is not easily accumulated in the film forming mechanism 300.

[0143] The tension detection mechanism 500 is connected to the straightening mechanism 200, and the straightening mechanism 200 is responsive to the tension detection mechanism 500. Both the straightening mechanism 200 and the extrusion mechanism 100 are responsive to the tension detection mechanism 500, which helps reduce the risk of the blank 600 being broken. For example, when the tension of the blank 600 needs to be increased, the extrusion speed of the extrusion mechanism 100 can be reduced. If the straightening mechanism 200 applies a high tension to the blank 600 at this time, the blank 600 may be broken. Therefore, the tension applied to the blank 600 by the straightening mechanism 200 can be appropriately reduced.

[0144] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A pole piece manufacturing device, characterized in that: include: An extrusion mechanism, used for extruding the material into a blank; a straightening mechanism, disposed downstream of the extrusion mechanism, comprising a first roller and a driving mechanism, wherein the first roller is disposed at an exit of the extrusion mechanism and is used to convey the blank, and the driving mechanism is connected to the first roller and is used to drive the first roller to rotate and / or move to straighten the blank; a film forming mechanism, disposed downstream of the straightening mechanism, for thinning the blank into a film; 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 straightening mechanism includes a second roller, and a gap is formed between the first roller and the second roller for the blank to pass through.

3. The pole piece manufacturing device according to claim 1 or 2, characterized in that: The pole piece manufacturing device further includes a plurality of rollers, and the rollers are used to convey the blank.

4. The pole piece manufacturing device according to claim 3, characterized in that: Along the conveying direction of the blank, the plurality of rollers are all located downstream of the first roller.

5. The pole piece manufacturing device according to any one of claims 1 to 4, characterized in that: The pole piece manufacturing device further comprises a tension detection mechanism, which is used to detect the tension of the blank, and the extrusion mechanism and / or the straightening mechanism responds to the tension detection mechanism.

6. The pole piece manufacturing device according to claim 5, characterized in that: The straightening mechanism comprises: a first roller, for conveying the blank; A driving mechanism is connected to the first roller, the driving mechanism responds to the tension detecting mechanism, and is used to drive the first roller to rotate and / or move to adjust the tension of the blank.

7. The pole piece manufacturing device according to claim 5, characterized in that: The tension detection mechanism comprises: a third roller, for conveying the blank; A detection unit supports the third roller, and the detection unit is used to detect the tension of the blank.

8. The pole piece manufacturing device according to claim 7, characterized in that: The pole piece manufacturing device includes a fourth roller and a fifth roller. Along the conveying direction of the blank, the fourth roller, the third roller and the fifth roller are arranged in sequence.

9. The pole piece manufacturing device according to claim 8, characterized in that: The film forming mechanism is provided downstream of the fifth roller.

10. The pole piece manufacturing device according to claim 9, characterized in that: The pole piece manufacturing device comprises two fifth rollers, and a feeding gap is formed between the two fifth rollers for the blank to pass through; The film forming mechanism comprises two pressing rollers, and a rolling gap is formed between the two pressing rollers for the blank to pass through; The feeding gap is at least partially opposite to the rolling gap.

11. The pole piece manufacturing device according to claim 10, characterized in that: The perpendicular bisector of the line connecting the centers of the two fifth rollers coincides with the perpendicular bisector of the line connecting the centers of the two pressing rollers.

12. The pole piece manufacturing device according to any one of claims 1 to 11, characterized in that: The film forming mechanism includes a rolling mechanism, which is used to roll the blank to thin the blank into a film.

13. The pole piece manufacturing device according to claim 12, characterized in that: The rolling mechanism includes a plurality of pressing rollers, and a rolling gap for the blank to pass through is formed between two adjacent pressing rollers.

14. The pole piece manufacturing device according to claim 13, characterized in that: Along the conveying direction of the blank, the pressing roller at the end of the plurality of pressing rollers is the first pressing roller, and the composite mechanism includes a composite roller, and a composite gap is formed between the composite roller and the first pressing roller for the membrane and the substrate to pass through.

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