Pole piece rolling device and battery production system

Abstract

The embodiment of the utility model provides a pole piece rolling device and a battery production system, the pole piece rolling device is used for rolling a pole piece, the pole piece is coated with an active material layer, and the pole piece rolling device comprises a frame body, a first compression roller, a second compression roller and a fixing mechanism. The second pressing roller and the first pressing roller are arranged side by side, the second pressing roller is provided with a plurality of protruding structures, the protruding structures are used for pressing protrusions on the pole piece, and the second pressing roller is movably arranged on the frame body in the first direction so that the protruding structures and the first pressing roller can abut against the pole piece from the two sides of the pole piece respectively; the first direction is parallel to the arrangement direction from the first compression roller to the second compression roller; the fixing mechanism is connected to the first pressing roller and enables the middle area of the first pressing roller to be bent towards the second pressing roller. The service life of the pole piece rolling device can be prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a pole piece rolling device and a battery production system. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the production process of battery cells, a rolling device is often used to roll the pole pieces to form interlayer gaps. How to improve the service life of the rolling device is a research direction in battery technology. Utility Model Content

[0004] The present application provides a pole piece rolling device and a battery production system, which can increase the service life of the pole piece rolling device.

[0005] The embodiment of the present application provides a pole piece rolling device for rolling a pole piece, the pole piece is coated with an active material layer, and the pole piece rolling device includes a frame, a first pressing roller, a second pressing roller and a fixing mechanism. The second pressing roller is arranged side by side with the first pressing roller, and the second pressing roller is provided with a plurality of protrusion structures, and the protrusion structures are used to press the protrusions on the pole piece. The second pressing roller is movably arranged on the frame along a first direction so that the plurality of protrusion structures and the first pressing roller press the pole piece from both sides respectively, and the first direction is parallel to the arrangement direction of the first pressing roller to the second pressing roller; the fixing mechanism is connected to the first pressing roller, and the middle area of ​​the first pressing roller is bent toward the second pressing roller.

[0006] In the above technical scheme, the pole piece rolling device of this embodiment applies force to the first pressing roller by setting a fixing mechanism, so that the first pressing roller bends toward the second pressing roller. In this way, compared with the first pressing roller and the second pressing roller bending in directions away from each other in the related art, the difference in pressure exerted on the raised structures at both ends of the second pressing roller and the raised structures in the middle becomes smaller, so the degree of wear of the raised structures at both ends of the second pressing roller is reduced, thereby increasing the service life of the second pressing roller.

[0007] In some embodiments, there are two fixing mechanisms, which are respectively fixed at two ends of the first pressing roller and apply force to the two ends of the first pressing roller to make the middle area of ​​the first pressing roller bend toward the second pressing roller.

[0008] In the above technical solution, the two fixing mechanisms are respectively fixedly arranged at the two ends of the first pressing roller, which is convenient for arrangement.

[0009] In some embodiments, the fixing mechanism includes a first bearing, a first bearing seat, a second bearing seat and a first force-applying structure, the first bearing is fixed to the end of the first pressure roller, the first bearing seat and the second bearing seat are arranged in the direction from the second pressure roller to the first pressure roller, and are respectively arranged on opposite sides of the first bearing along the first direction, the first bearing seat is connected to the frame, the first force-applying structure is against the side of the second bearing seat away from the first bearing, and applies a force to the second bearing seat in the direction from the first pressure roller to the second pressure roller, the first bearing seat has a first curved surface for matching with the first bearing, the second bearing seat has a second curved surface for matching with the first bearing, both the first curved surface and the second curved surface are inclined toward the center area of ​​the second pressure roller in its own axial direction, and under the action of the first force-applying structure, the first bearing is against the first curved surface and the second curved surface to make the middle area of ​​the first pressure roller bend toward the second pressure roller.

[0010] In the above technical solution, the fixing mechanism of this embodiment is configured to include a first bearing, a first bearing seat, a second bearing seat and a first force-applying structure. The first curved surface of the first bearing seat and the second curved surface of the second bearing seat are utilized to bend the first pressure roller. This structure has relatively little improvement over the original structure, and it is relatively convenient to adjust the degree of bending of the first pressure roller.

[0011] In some embodiments, the first force-applying structure is a threaded rod, which is threadedly connected to the frame, extends along the first direction, and an end of the threaded rod abuts against the second bearing seat.

[0012] In the above technical solution, the threaded rod is used to adjust the force acting on the second bearing seat, which is not only convenient for adjustment but also occupies less space and has lower cost.

[0013] In some embodiments, the second bearing seat is provided with a limiting blind hole, and the end of the threaded rod extends into the limiting blind hole.

[0014] In the above technical solution, the threaded rod and the second bearing seat can form a mutual limiting effect, thereby reducing the displacement of the second bearing seat during the force application process.

[0015] In some embodiments, the inclination angle of the first curved surface relative to the second direction is α, and α satisfies: 2°≤α≤10°, wherein the second direction is parallel to the arrangement direction of the two ends of the first pressing roller.

[0016] In the above technical solution, α is set to be greater than or equal to 2° to produce a more obvious bending moment effect on the first pressing roller; α is set to be less than or equal to 10° to reduce the possibility of damage to the first pressing roller due to large bending.

[0017] In some embodiments, α satisfies: 4°≤α≤7°.

[0018] In the above technical solution, α is further limited to be greater than or equal to 4° to produce a more obvious bending moment effect on the first pressure roller; α is further limited to be less than or equal to 7° to further reduce the possibility of damage to the first pressure roller due to large bending.

[0019] In some embodiments, the inclination angle of the second curved surface relative to the second direction is β, and β satisfies: 2°≤β≤10°, wherein the second direction is parallel to the arrangement direction of the two ends of the first pressing roller.

[0020] In the above technical solution, β is set to be greater than or equal to 2° to produce a more obvious bending moment effect on the first pressing roller; β is set to be less than or equal to 10° to reduce the possibility of damage to the first pressing roller due to large bending.

[0021] In some embodiments, β satisfies: 4°≤β≤7°.

[0022] In the above technical solution, β is further limited to be greater than or equal to 4° to produce a more obvious bending moment effect on the first pressure roller; β is further limited to be less than or equal to 7° to further reduce the possibility of damage to the first pressure roller due to large bending.

[0023] In some embodiments, the fixing mechanism includes a second force-applying structure, a second bearing and a third bearing. The second bearing and the third bearing are both mounted on the shaft of the first pressure roller and are arranged at intervals along the axial direction of the first pressure roller. The third bearing is located on the outside of the second bearing. The second bearing and the shaft clearance of the first pressure roller are matched. The third bearing is fixedly connected to the shaft of the first pressure roller. The second force-applying structure provides a force to the third bearing in the direction from the second pressure roller to the first pressure roller, and causes the first pressure roller to bend toward the second pressure roller under the support of the second bearing.

[0024] In the above technical solution, the fixing mechanism is configured to include a second force-applying structure, a second bearing and a third bearing. The second bearing is used as a fulcrum, and the second force-applying structure applies a force to the third bearing to form a bending moment effect. This structure is more reliable and it is more convenient to adjust the bending degree of the first pressure roller.

[0025] In some embodiments, the second force-applying structure is a linear drive member.

[0026] In the above technical solution, the second force-applying structure is set as a linear drive member, which is more labor-saving to adjust and more precise to control the applied force, thereby more accurately adjusting the bending degree of the first pressing roller.

[0027] In some embodiments, the fixing mechanism also includes a third bearing seat, which is connected to the second bearing; and / or the fixing mechanism also includes a fourth bearing seat, which is connected to the third bearing, and the second force structure applies force to the third bearing through the fourth bearing seat.

[0028] In the above technical solution, the third bearing seat is provided to facilitate the fixing of the second bearing. The fourth bearing seat is provided to facilitate not only the fixing of the third bearing but also the application of force to the third bearing.

[0029] In some embodiments, the fixing mechanism includes a third force-applying structure, a semicircular bearing and two fourth bearings. The two fourth bearings are respectively arranged at both ends of the axis of the first pressure roller and are both matched with the axis clearance of the first pressure roller. The semicircular bearings are arranged below the central area of ​​the first pressure roller in its own axial direction and are against the first pressure roller. The third force-applying structure provides a force to the semicircular bearings in the direction from the first pressure roller to the second pressure roller, and causes the middle area of ​​the first pressure roller to bend toward the second pressure roller.

[0030] In the above technical solution, the fixing mechanism is configured to include a third force-applying structure, a semicircular bearing and two fourth bearings. The two fourth bearings are used as fulcrums, and the third force-applying structure applies force to the semicircular bearings to form a bending moment effect. This structure is more reliable and it is more convenient to adjust the bending degree of the first pressure roller.

[0031] In some embodiments, the fixing mechanism also includes a fifth bearing seat, which is connected to the semicircular bearing, and the third force structure applies force to the semicircular bearing through the fifth bearing seat; and / or, the fixing mechanism also includes a sixth bearing seat, which is connected to the fourth bearing.

[0032] In the above technical solution, a fifth bearing seat is provided to facilitate the fixation of the semicircular bearing and to facilitate the application of force to the semicircular bearing. A sixth bearing seat is provided to facilitate the fixation of the fourth bearing.

[0033] In a second aspect, an embodiment of the present application further provides a battery production system, comprising the above-mentioned pole piece rolling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0035] Figure 1 A schematic diagram of the structure of a pole piece rolling device provided in some embodiments of the present application;

[0036] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0037] Figure 3Another partial structural schematic diagram of a pole piece rolling device provided in some embodiments of the present application;

[0038] Figure 4 A schematic diagram of another partial structure of the pole piece rolling device provided in some embodiments of the present application.

[0039] The reference numerals of the specific embodiments are as follows:

[0040] 100. Pole piece rolling device;

[0041] 1. frame; 11. slideway; 12. sliding part;

[0042] 2. The first pressing roller;

[0043] 3. Second pressing roller; 31. Protruding structure;

[0044] 4. Fixing mechanism;

[0045] 411, first bearing; 412, first bearing seat; 413, second bearing seat; 414, first force-applying structure; 415, first curved surface; 416, second curved surface;

[0046] 421, a second force applying structure; 422, a second bearing; 423, a third bearing;

[0047] 431, third force applying structure; 432, semicircular bearing; 433, fourth bearing;

[0048] 5. Driving parts;

[0049] X, first direction; Y, second direction. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The term “plurality” used in this application refers to two or more (including two).

[0057] Before the battery cell pole pieces are cut, they are usually rolled to form protrusions, so that interlayer gaps can be formed after the electrode assembly is assembled, reducing the occurrence of poor wetting and lithium deposition. The device for forming the protrusions usually includes two rollers arranged side by side, one of which has multiple protrusions to form protrusions on the pole piece, and the other roller is used to press the pole piece from the other side.

[0058] After the device has been used for a long time, the two rollers usually bend in directions away from each other, which causes the protruding structures at both ends to be worn more seriously, thereby reducing the service life of the rollers.

[0059] In view of this, the present application provides a pole piece rolling device, which applies a force to a first pressure roller through a fixing mechanism so that the first pressure roller bends toward the second pressure roller. In this way, after long-term use, the second pressure roller bends in a direction away from the first pressure roller, and the first pressure roller bends toward the second pressure roller, that is, the first pressure roller and the second pressure roller are both bent in the same direction. When the pole piece passes over the roller, the difference in pressure exerted on the raised structures at both ends of the second pressure roller and the raised structures in the middle becomes smaller, and the degree of wear of the raised structures at both ends of the second pressure roller is reduced, thereby increasing the service life of the second pressure roller.

[0060] Figure 1 A schematic diagram of the structure of a pole piece rolling device provided in some embodiments of the present application.

[0061] like Figure 1 As shown, the present application provides a pole piece rolling device 100 for rolling pole pieces, the pole pieces being coated with an active material layer. The pole piece rolling device 100 comprises a frame 1, a first pressing roller 2, a second pressing roller 3 and a fixing mechanism 4. The second pressing roller 3 is arranged side by side with the first pressing roller 2, and the second pressing roller 3 is provided with a plurality of protrusion structures 31, and the protrusion structures 31 are used to press protrusions on the pole piece, and the second pressing roller 3 is movably arranged on the frame 1 along a first direction X, so that the plurality of protrusion structures 31 and the first pressing roller 2 respectively press the pole piece from both sides of the pole piece, and the first direction X is parallel to the arrangement direction of the first pressing roller 2 to the second pressing roller 3. The fixing mechanism 4 is connected to the first pressing roller 2, and causes the middle area of ​​the first pressing roller 2 to bend toward the second pressing roller 3.

[0062] The pole piece of this embodiment may be coated with a positive electrode active material layer or a negative electrode active material layer.

[0063] Optionally, the first pressing roller 2 is located below the second pressing roller 3 .

[0064] Exemplarily, the plurality of protrusion structures 31 form a plurality of circles of protrusion structures 31 , and each circle of protrusion structures 31 is disposed around the axis of the second pressing roller 3 . Two adjacent circles of protrusion structures 31 are disposed staggered along the axial direction of the second pressing roller 3 .

[0065] The plurality of protrusion structures 31 may also be arranged in other forms, such as in an array.

[0066] The second pressing roller 3 of this embodiment is movably arranged on the frame 1 along the first direction X. Exemplarily, the pole piece rolling device 100 includes a driving member 5, which is connected to the second pressing roller 3 and is used to drive the second pressing roller 3 to reciprocate along the first direction X. Further, the frame 1 includes a slide 11 and a sliding member 12, the sliding member 12 is embedded in the slide 11, the driving member 5 is fixed to the frame 1 and connected to the sliding member 12, the two ends of the second pressing roller 3 are fixed to the sliding member 12, and the driving member 5 drives the sliding member 12 to move along the first direction X on the slide 11, so that the second pressing roller 3 reciprocates in the first direction X. In another exemplary embodiment, the number of driving members is two, and the two driving members are respectively connected to the two ends of the second pressing roller 3, so as to drive the second pressing roller 3 to reciprocate in the first direction X.

[0067] The pole piece rolling device 100 of this embodiment applies a force to the first pressing roller 2 by setting a fixing mechanism 4, so that the first pressing roller 2 bends toward the second pressing roller 3. In this way, after long-term use, the first pressing roller 2 and the second pressing roller 3 are bent in the same direction. Compared with the first pressing roller 2 and the second pressing roller 3 bending in directions away from each other in the related art, the difference in pressure on the protruding structures 31 at both ends of the second pressing roller 3 and the protruding structures 31 in the middle is reduced, so the wear degree of the protruding structures 31 at both ends of the second pressing roller 3 is reduced, thereby improving the service life of the second pressing roller 3. Among them, the protruding structures 31 at both ends refer to the two ends of the second pressing roller 3 in the axial direction of the plurality of protruding structures 31.

[0068] In some embodiments, there are two fixing mechanisms 4 , which are respectively fixed at both ends of the first pressing roller 2 and apply force to both ends of the first pressing roller 2 to make the middle area of ​​the first pressing roller 2 bend toward the second pressing roller 3 .

[0069] The two fixing mechanisms 4 are respectively fixedly arranged at the two ends of the first pressing roller 2, and this method is convenient for arrangement.

[0070] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0071] See also Figure 1 and Figure 2In some embodiments, the fixing mechanism 4 includes a first bearing 411, a first bearing seat 412, a second bearing seat 413 and a first force-applying structure 414. The first bearing 411 is fixed to the end of the first pressure roller 2, the first bearing seat 412 and the second bearing seat 413 are arranged along the direction from the second pressure roller 3 to the first pressure roller 2, and are respectively arranged on opposite sides of the first bearing 411 along the first direction X. The first bearing seat 412 is connected to the frame 1, and the first force-applying structure 414 abuts against the side of the second bearing seat 413 away from the first bearing 411, and applies a force to the second bearing seat 413 in the direction from the first pressure roller 2 to the second pressure roller 3. The first bearing seat 412 has a first curved surface 415 for matching with the first bearing 411, and the second bearing seat 413 has a second curved surface 416 for matching with the first bearing 411. The first curved surface 415 and the second curved surface 416 are both inclined toward the central area of ​​the second pressure roller 3 in its own axial direction. Under the action of the first force-applying structure 414, the first bearing 411 is abutted against the first curved surface 415 and the second curved surface 416 to make the middle area of ​​the first pressure roller 2 bend toward the second pressure roller 3.

[0072] In this embodiment, the radial dimension of the end portion of the first pressing roller 2 is smaller than the radial dimension of the portion of the first pressing roller 2 that abuts against the pole piece.

[0073] Exemplarily, the first pressing roller 2 is located below the second pressing roller 3 , and the first bearing seat 412 is located above the second bearing seat 413 .

[0074] In this embodiment, the first bearing seat 412 and the frame body 1 can be connected by welding or integral molding.

[0075] The first force-applying structure 414 of this embodiment abuts against the side of the second bearing seat 413 away from the first bearing 411. The first force-applying structure 414 can be a linear drive structure such as a cylinder or a hydraulic cylinder, which applies a force to the second bearing seat 413 in the direction from the first pressure roller 2 to the second pressure roller 3.

[0076] In this embodiment, the first curved surface 415 is curved along the outer surface of the first bearing 411 , and the second curved surface 416 is curved along the outer surface of the second bearing 422 .

[0077] In this embodiment, the first curved surface 415 and the second curved surface 416 are both inclined toward the central area of ​​the second pressing roller 3 in its own axial direction. The inclination degrees of the first curved surface 415 and the second curved surface 416 can be the same or different.

[0078] Attach Figure 2 For example, the first curved surface 415 forms a fulcrum on the upper left side of the first bearing 411, and the second curved surface 416 exerts a force on the lower right side of the first bearing 411 to generate a bending moment effect, forcing the first pressure roller 2 to bend.

[0079] The fixing mechanism 4 of this embodiment is configured to include a first bearing 411, a first bearing seat 412, a second bearing seat 413 and a first force-applying structure 414. The first curved surface 415 and the second curved surface 416 of the first bearing seat 412 and the second bearing seat 413 are used to bend the first pressure roller 2. This structure has little improvement over the original structure and is more convenient to adjust the degree of bending of the first pressure roller 2.

[0080] In some embodiments, the first force-applying structure 414 is a threaded rod, which is threadedly connected to the frame 1 . The threaded rod extends along the first direction X, and an end of the threaded rod abuts against the second bearing seat 413 .

[0081] The use of a threaded rod to adjust the force acting on the second bearing seat 413 is not only convenient for adjustment, but also occupies less space and has lower costs.

[0082] In some embodiments, the second bearing seat 413 is provided with a limiting blind hole, and the end of the threaded rod extends into the limiting blind hole.

[0083] The limiting blind hole in this embodiment refers to a hole that does not penetrate the second bearing seat 413 along the first direction X, and the hole wall is arranged in a circle.

[0084] Exemplarily, the end of the threaded rod matches the shape and size of the limiting blind hole, for example, both are circular.

[0085] With such arrangement, the threaded rod and the second bearing seat 413 can limit each other, thereby reducing the displacement of the second bearing seat 413 during the force application process.

[0086] In some embodiments, the inclination angle of the first curved surface 415 relative to the second direction Y is α, α satisfies: 2°≤α≤10°, wherein the second direction Y is parallel to the arrangement direction of the two ends of the first pressure roller 2; and / or, the inclination angle of the second curved surface 416 relative to the second direction Y is β, β satisfies: 2°≤β≤10°, wherein the second direction Y is parallel to the arrangement direction of the two ends of the first pressure roller 2.

[0087] Optionally, the value of α may be 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9° or 10°.

[0088] Optionally, the value of β can be 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9° or 10°.

[0089] In this embodiment, the inclination angle of the first curved surface 415 relative to the axial direction of the first pressing roller 2 refers to the angle formed by the axial direction of the first pressing roller 2 after the first curved surface 415 is intercepted by a plane formed by the first direction X and the second direction Y.

[0090] The inclination angle of the second curved surface 416 relative to the axial direction of the first pressing roller 2 in this embodiment refers to the angle formed by the axial direction of the first pressing roller 2 after the second curved surface 416 is intercepted by a plane formed by the first direction X and the second direction Y.

[0091] α or β is set to be greater than or equal to 2° to produce a more obvious bending moment effect on the first pressing roller 2; α or β is set to be less than or equal to 10° to reduce the possibility of damage to the first pressing roller 2 due to large bending.

[0092] In some embodiments, α satisfies: 4°≤α≤7°.

[0093] α is further limited to be greater than or equal to 4° to produce a more obvious bending moment effect on the first pressing roller 2; α is further limited to be less than or equal to 7° to further reduce the situation where the first pressing roller 2 is damaged due to large bending.

[0094] In some embodiments, β satisfies: 4°≤β≤7°.

[0095] β is further limited to be greater than or equal to 4° to produce a more obvious bending moment effect on the first pressing roller 2; β is further limited to be less than or equal to 7° to further reduce the situation where the first pressing roller 2 is damaged due to large bending.

[0096] Figure 3 Another partial structural schematic diagram of the pole piece rolling device provided in some embodiments of the present application.

[0097] See also Figure 3 In some embodiments, the fixing mechanism 4 includes a second force-applying structure 421, a second bearing 422 and a third bearing 423. The second bearing 422 and the third bearing 423 are both sleeved on the shaft of the first pressure roller 2 and are arranged at intervals along the axial direction of the first pressure roller 2. The third bearing 423 is located on the outer side of the second bearing 422. The second bearing 422 and the axial clearance of the first pressure roller 2 are matched. The third bearing 423 is fixedly connected to the shaft of the first pressure roller 2. The second force-applying structure 421 provides a force to the third bearing 423 along the direction from the second pressure roller 3 to the first pressure roller 2, and makes the first pressure roller 2 bend toward the second pressure roller 3 under the support of the second bearing 422.

[0098] The third bearing 423 of this embodiment is located outside the second bearing 422 , that is, the third bearing 423 is located on the side of the second bearing 422 away from the area of ​​the first pressing roller 2 for pressing the pole piece.

[0099] The second bearing 422 of this embodiment is clearance-matched with the shaft of the first pressure roller 2 , that is, the inner diameter of the second bearing 422 is larger than the outer diameter of the shaft of the first pressure roller 2 .

[0100] The second force-applying structure 421 of this embodiment may directly contact the third bearing 423 to provide a force to the third bearing 423 , or may not contact the third bearing 423 and provide a force to the third bearing 423 through other components.

[0101] The second force-applying structure 421 of this embodiment may be a threaded rod threadedly connected to the frame 1, or may be other structures. Figure 3 As shown, it provides a force from top to bottom to the third bearing 423 .

[0102] The second bearing 422 of this embodiment forms a fulcrum on the lower side of the shaft of the first pressure roller 2, and the third bearing 423 applies a force on the upper side of the shaft of the first pressure roller 2 to generate a bending moment effect, forcing the first pressure roller 2 to bend.

[0103] Optionally, the second bearing 422 and the third bearing 423 are both fixedly connected to the frame 1 .

[0104] The fixing mechanism 4 is configured to include a second force-applying structure 421, a second bearing 422 and a third bearing 423. The second bearing 422 is used as a fulcrum, and the second force-applying structure 421 applies a force to the third bearing 423 to form a bending moment effect. This structure is more reliable and it is more convenient to adjust the bending degree of the first pressure roller 2.

[0105] In some embodiments, the second force-applying structure 421 is a linear driving member.

[0106] The second force applying structure 421 of this embodiment may be a cylinder, a hydraulic cylinder, or the like.

[0107] The second force-applying structure 421 is configured as a linear driving member, which makes adjustment easier and allows for more precise control of the applied force, thereby allowing the bending degree of the first pressing roller 2 to be adjusted more accurately.

[0108] In some embodiments, the fixing mechanism 4 also includes a third bearing seat, which is connected to the second bearing 422; and / or, the fixing mechanism 4 also includes a fourth bearing seat, which is connected to the third bearing 423, and the second force structure 421 applies a force to the third bearing 423 through the fourth bearing seat.

[0109] Optionally, the third bearing seat is connected to the frame body 1, and the second bearing 422 is connected to the frame body 1 through the third bearing seat.

[0110] Optionally, the fourth bearing seat is connected to the frame body 1, and the third bearing 423 is connected to the frame body 1 through the fourth bearing seat.

[0111] The third bearing seat is provided to facilitate the fixing of the second bearing 422. The fourth bearing seat is provided to facilitate not only the fixing of the third bearing 423 but also the application of force to the third bearing 423.

[0112] Figure 4 A schematic diagram of another partial structure of the pole piece rolling device provided in some embodiments of the present application.

[0113] See also Figure 4 In some embodiments, the fixing mechanism 4 includes a third force-applying structure 431, a semicircular bearing 432 and two fourth bearings 433. The two fourth bearings 433 are respectively arranged at the two ends of the axis of the first pressure roller 2, and both are matched with the axis clearance of the first pressure roller 2. The semicircular bearing 432 is arranged below the central area of ​​the first pressure roller 2 in its own axial direction and is against the first pressure roller 2. The third force-applying structure 431 provides a force to the semicircular bearing 432 along the direction of the first pressure roller 2 pointing to the second pressure roller 3, and makes the middle area of ​​the first pressure roller 2 bend toward the second pressure roller 3.

[0114] The fourth bearing 433 of this embodiment is clearance-matched with the shaft of the first pressure roller 2 , that is, the inner diameter of the fourth bearing 433 is larger than the outer diameter of the shaft of the first pressure roller 2 .

[0115] The semicircular bearing 432 of the present embodiment refers to a bearing that is semi-circular in shape and whose ball portion contacts the first pressing roller 2 .

[0116] The third force-applying structure 431 of this embodiment may be a cylinder, a hydraulic cylinder, or a linear motor.

[0117] The third force-applying structure 431 of this embodiment may directly contact the semicircular bearing 432 to provide a force thereto, or may not contact the semicircular bearing 432 and provide a force to the semicircular bearing 432 through other components.

[0118] The two fourth bearings 433 of this embodiment form a fulcrum effect on the two ends of the first pressure roller 2, and the semicircular bearing 432 applies a force to the central area of ​​the first pressure roller 2 to generate a bending moment effect, forcing the first pressure roller 2 to bend.

[0119] Optionally, the semicircular bearing 432 and the fourth bearing 433 are both fixedly connected to the frame 1 .

[0120] The fixing mechanism 4 is configured to include a third force-applying structure 431, a semicircular bearing 432 and two fourth bearings 433. The two fourth bearings 433 are used as fulcrums. The third force-applying structure 431 applies a force to the semicircular bearings 432 to form a bending moment effect. This structure is more reliable and it is more convenient to adjust the bending degree of the first pressure roller 2.

[0121] In some embodiments, the fixing mechanism 4 also includes a fifth bearing seat, which is connected to the semicircular bearing 432, and the third force structure 431 applies force to the semicircular bearing 432 through the fifth bearing seat; and / or, the fixing mechanism 4 also includes a sixth bearing seat, which is connected to the fourth bearing 433.

[0122] Optionally, the fifth bearing seat is connected to the frame body 1, and the semicircular bearing 432 is connected to the frame body 1 through the fifth bearing seat.

[0123] Optionally, the sixth bearing seat is connected to the frame body 1, and the fourth bearing 433 is connected to the frame body 1 through the sixth bearing seat.

[0124] The fifth bearing seat is provided to facilitate the fixing of the semicircular bearing 432 and to facilitate the application of force to the semicircular bearing 432. The sixth bearing seat is provided to facilitate the fixing of the fourth bearing 433.

[0125] An embodiment of the present application provides a battery production system, including the above-mentioned pole piece rolling device 100.

[0126] Exemplarily, the battery production system further includes a pole piece coating device, which is located upstream of the pole piece rolling device 100 and is used to coat the active material on at least one side of the current collector.

[0127] Exemplarily, the battery production system further includes a drying device, which is located downstream of the electrode coating device and upstream of the electrode rolling device 100 , and is used to dry the current collector coated with the active material to form a dried electrode.

[0128] See also Figure 1 and Figure 2, the embodiment of the present application provides a pole piece rolling device 100 for rolling pole pieces, the pole pieces are coated with active material layers. The pole piece rolling device 100 includes a frame 1, a first pressing roller 2, a second pressing roller 3 and a fixing mechanism 4. The second pressing roller 3 is arranged side by side with the first pressing roller 2, and the second pressing roller 3 is provided with a plurality of protrusion structures 31, and the protrusion structures 31 are used to press the protrusions on the pole piece. The second pressing roller 3 is movably arranged on the frame 1 along the first direction X, so that the plurality of protrusion structures 31 and the first pressing roller 2 respectively press the pole piece from both sides, and the first direction X is parallel to the arrangement direction of the first pressing roller 2 to the second pressing roller 3. The fixing mechanism 4 is connected to the first pressing roller 2, and makes the middle area of ​​the first pressing roller 2 bend toward the second pressing roller 3. There are two fixing mechanisms 4, and the two fixing mechanisms 4 are respectively fixed at the two ends of the first pressing roller 2, and apply a force to the two ends of the first pressing roller 2, so that the middle area of ​​the first pressing roller 2 bends toward the second pressing roller 3. The fixing mechanism 4 includes a first bearing 411, a first bearing seat 412, a second bearing seat 413 and a first force-applying structure 414. The first bearing 411 is fixed to the end of the first pressure roller 2, the first bearing seat 412 and the second bearing seat 413 are arranged along the direction from the second pressure roller 3 to the first pressure roller 2, and are respectively arranged on opposite sides of the first bearing 411 along the first direction X. The first bearing seat 412 is connected to the frame 1, and the first force-applying structure 414 abuts against the side of the second bearing seat 413 away from the first bearing 411, and applies a force to the second bearing seat 413 in the direction from the first pressure roller 2 to the second pressure roller 3. The first bearing seat 412 has a first curved surface 415 for matching with the first bearing 411, and the second bearing seat 413 has a second curved surface 416 for matching with the first bearing 411. The first curved surface 415 and the second curved surface 416 are both inclined toward the central area of ​​the second pressure roller 3 in the axial direction. Under the action of the first force-applying structure 414, the first bearing 411 abuts against the first curved surface 415 and the second curved surface 416, so that the middle area of ​​the first pressure roller is bent toward the second pressure roller 3. The first force-applying structure 414 is a threaded rod, which is threadedly connected to the frame 1, extends along the first direction X, and the end of the threaded rod abuts against the second bearing seat 413. The second bearing seat 413 is provided with a limiting blind hole, and the end of the threaded rod extends into the limiting blind hole. The inclination angle of the first curved surface 415 relative to the second direction Y is α, and α satisfies: 2°≤α≤10°; the inclination angle of the second curved surface 416 relative to the second direction Y is β, and β satisfies: 2°≤β≤10°.

[0129] 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.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A pole piece rolling device, used for rolling a pole piece, wherein the pole piece is coated with an active material layer, characterized in that: The pole piece rolling device comprises: Frame; A first pressing roller; a second pressing roller, the second pressing roller being arranged side by side with the first pressing roller, the second pressing roller being provided with a plurality of protrusion structures, the protrusion structures being used to press protrusions on the pole piece, the second pressing roller being movably arranged on the frame along a first direction so that the plurality of protrusion structures and the first pressing roller respectively press the pole piece from both sides of the pole piece, and the first direction being parallel to an arrangement direction from the first pressing roller to the second pressing roller; A fixing mechanism is connected to the first pressing roller and causes a middle area of ​​the first pressing roller to bend toward the second pressing roller.

2. The pole piece rolling device according to claim 1, characterized in that: There are two fixing mechanisms, which are respectively fixed at two ends of the first pressing roller and apply force to the two ends of the first pressing roller so that the middle area of ​​the first pressing roller bends toward the second pressing roller.

3. The pole piece rolling device according to claim 2, characterized in that: The fixing mechanism comprises a first bearing, a first bearing seat, a second bearing seat and a first force-applying structure, wherein the first bearing is fixed to the end of the first pressure roller, the first bearing seat and the second bearing seat are arranged along the direction from the second pressure roller to the first pressure roller, and are respectively arranged on opposite sides of the first bearing along the first direction, the first bearing seat is connected to the frame, and the first force-applying structure abuts against a side of the second bearing seat away from the first bearing, and applies a force to the second bearing seat in the direction from the first pressure roller to the second pressure roller; The first bearing seat has a first curved surface for matching with the first bearing, and the second bearing seat has a second curved surface for matching with the first bearing. The first curved surface and the second curved surface are both inclined toward the central area of ​​the second pressure roller in its own axial direction. Under the action of the first force-applying structure, the first bearing is offset against the first curved surface and the second curved surface to make the middle area of ​​the first pressure roller bend toward the second pressure roller.

4. The pole piece rolling device according to claim 3, characterized in that: The first force-applying structure is a threaded rod, the threaded rod is threadedly connected to the frame, the threaded rod extends along the first direction, and an end portion of the threaded rod abuts against the second bearing seat.

5. The pole piece rolling device according to claim 4, characterized in that: The second bearing seat is provided with a limiting blind hole, and the end of the threaded rod extends into the limiting blind hole.

6. The pole piece rolling device according to claim 3, characterized in that: The inclination angle of the first curved surface relative to the second direction is α, and α satisfies: 2°≤α≤10°, wherein the second direction is parallel to the arrangement direction of the two ends of the first pressing roller.

7. The pole piece rolling device according to claim 6, characterized in that: The α satisfies: 4°≤α≤7°.

8. The pole piece rolling device according to claim 3, characterized in that: The inclination angle of the second curved surface relative to the second direction is β, and β satisfies: 2°≤β≤10°, wherein the second direction is parallel to the arrangement direction of the two ends of the first pressing roller.

9. The pole piece rolling device according to claim 8, characterized in that: The β satisfies: 4°≤β≤7°.

10. The pole piece rolling device according to claim 2, characterized in that: The fixing mechanism includes a second force-applying structure, a second bearing and a third bearing. The second bearing and the third bearing are both sleeved on the shaft of the first pressure roller and are arranged at intervals along the axial direction of the first pressure roller. The third bearing is located on the outer side of the second bearing. The second bearing is loosely matched with the axis of the first pressure roller, the third bearing is fixedly connected to the axis of the first pressure roller, the second force-applying structure provides a force to the third bearing in the direction from the second pressure roller to the first pressure roller, and causes the first pressure roller to bend toward the second pressure roller under the support of the second bearing.

11. The pole piece rolling device according to claim 10, characterized in that: The second force applying structure is a linear driving member.

12. The pole piece rolling device according to claim 10, characterized in that: The fixing mechanism further comprises a third bearing seat, wherein the third bearing seat is connected to the second bearing; and / or, The fixing mechanism also includes a fourth bearing seat, the fourth bearing seat is connected to the third bearing, and the second force-applying structure applies a force to the third bearing through the fourth bearing seat.

13. The pole piece rolling device according to claim 1, characterized in that: The fixing mechanism includes a third force-applying structure, a semicircular bearing and two fourth bearings. The two fourth bearings are respectively arranged at the two ends of the axis of the first pressure roller and are both clearance-matched with the axis of the first pressure roller. The semicircular bearing is arranged below the central area of ​​the first pressure roller in its own axial direction and is against the first pressure roller. The third force-applying structure provides a force to the semicircular bearing along the direction from the first pressure roller to the second pressure roller, and causes the middle area of ​​the first pressure roller to bend toward the second pressure roller.

14. The pole piece rolling device according to claim 13, characterized in that: The fixing mechanism further includes a fifth bearing seat, the fifth bearing seat is connected to the semicircular bearing, and the third force-applying structure applies a force to the semicircular bearing through the fifth bearing seat; and / or, The fixing mechanism also includes a sixth bearing seat, and the sixth bearing seat is connected to the fourth bearing.

15. A battery production system, characterized in that: It comprises a pole piece rolling device as described in any one of claims 1-14.

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