Pole piece pulling device and battery production line

Abstract

The application discloses a pole piece traction device and a battery production line. The pole piece traction device comprises a support, an over roller and an adjusting assembly. The support has a shaft hole. The end of the over roller is rotatably arranged in the shaft hole. The over roller is used to pull the pole piece. The adjusting assembly is arranged between the support and the over roller and is used to drive the over roller to move in the radial direction of the over roller, so as to increase or decrease the friction when the over roller rotates. According to the pole piece traction device, the adjusting assembly can flexibly control the friction when the over roller rotates by exerting the force in the radial direction towards the over roller. Then, the rotating speed of the over roller can be adjusted according to actual requirements. Meanwhile, the radial direction of the over roller is constrained, the eccentric runout amplitude of the over roller can be weakened, the linear speed of the whole roller surface of the over roller tends to be uniform, the tension of the pole piece in the transverse direction is leveled, the wrinkles caused by the linear speed difference of the roller surface of the over roller can be relieved, and the pole piece traction device has good reliability and stability.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an electrode traction device and a battery production line. Background Technology

[0002] Coating is one of the core key processes in lithium battery manufacturing. Electrode coating specifically involves uniformly coating a well-stirred electrode slurry onto the surface of a substrate, followed by drying to remove organic solvents from the slurry. During the traction process, uneven force distribution along the travel direction can easily lead to electrode wrinkling defects. Related technologies often employ active contact damping structures, using damping rollers to transmit damping force and reduce roller speed, performing low-speed lateral stretching on the wrinkled areas of the electrode to release localized stress and improve the wrinkling problem. However, this technology suffers from fixed torque, poor adjustment flexibility, and wear and tear on the contact damping rollers over long-term operation, leading to a continuous decline in damping performance and difficulty in ensuring stability. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes an electrode traction device, and a coating equipment and battery production line including this electrode traction device. The electrode traction device applies a radial force to the roller by adjusting the components, which can flexibly control the friction force when the roller rotates. In addition, the rotation speed of the roller can be adjusted according to actual needs. At the same time, the radial direction of the roller is constrained, which can effectively weaken the eccentric runout amplitude of the roller. The linear velocity of the roller surface tends to be uniform throughout the entire circle, so that the tension of the electrode is flattened in all directions in the lateral direction. This can effectively alleviate the wrinkles caused by the difference in linear velocity of the roller surface, and has good reliability and stability.

[0004] In a first aspect, embodiments of this application provide an electrode traction device, comprising: a bracket having a shaft hole; a guide roller, the end of which is rotatably disposed in the shaft hole, the guide roller being used to traction an electrode; and an adjustment assembly disposed between the bracket and the guide roller, for applying a radial force toward the guide roller to increase or decrease the frictional force when the guide roller rotates, wherein the adjustment assembly comprises: a first magnetic attractor disposed on the guide roller; a second magnetic attractor disposed on the bracket and spaced apart from the first magnetic attractor along the radial direction of the guide roller; and a controller for controlling the first magnetic attractor and / or the second magnetic attractor to attract or repel each other.

[0005] In the above-mentioned technical method, by adjusting the component to apply a radial force towards the roller, the frictional force during the rotation of the roller can be flexibly controlled. Thus, the rotational speed of the roller can be adjusted according to actual needs. At the same time, the radial direction of the roller is constrained, which can effectively weaken the eccentric runout amplitude of the roller. The linear velocity of the roller surface around the entire circle tends to be uniform, so that the tension in all parts of the electrode sheet in the lateral direction is flattened. This can effectively alleviate the wrinkles caused by the difference in linear velocity of the roller surface, and has good reliability and stability. By using the first and second magnetic suction components that provide force without contact, the frictional force during the rotation of the roller can be effectively increased, thereby effectively reducing the rotational speed of the roller and ensuring high reliability.

[0006] In some embodiments of this application, at least one of the first magnetic attractor and the second magnetic attractor is an electromagnetic component, and the controller is electrically connected to the electromagnetic component to change the magnetism of the electromagnetic component; or, both the first magnetic attractor and the second magnetic attractor are permanent magnets, and the controller is drively connected to the first magnetic attractor and / or the second magnetic attractor to drive the first magnetic attractor and / or the second magnetic attractor to rotate.

[0007] In the above-mentioned technical method, the types of the first magnetic suction component and the second magnetic suction component can be set according to actual needs, so as to better apply radial force to the roller, thereby better controlling the friction force when the roller rotates, and providing good flexibility.

[0008] In some embodiments of this application, the roller includes a roller body and a rotating shaft coaxially connected to the roller body, and the first magnetic suction element is disposed on the roller body and / or the rotating shaft.

[0009] In the above-mentioned technical approach, the position of the first magnetic component can be set according to actual needs, which offers good flexibility.

[0010] In some embodiments of this application, the first magnetic attractor is formed as an annular ring sleeved on the outer peripheral surface of the roller, or multiple first magnetic attractors are provided, and multiple first magnetic attractors are evenly spaced around the axis of the roller on the outer peripheral surface of the roller.

[0011] In the above-mentioned technical method, by arranging the first magnetic attractor around the axis of the roller, the second magnetic attractor can attract or repel the first magnetic attractor in a better manner during the rotation of the roller, thereby increasing the friction force when the roller rotates.

[0012] In some embodiments of this application, the second magnetic element is formed as an arc shape coaxial with the roller.

[0013] In the above-mentioned technical method, the second magnetic suction component can effectively apply a force to the roller in the radial direction, thereby making the rotation of the roller more stable.

[0014] In some embodiments of this application, the roller is a one-piece molded part.

[0015] In the above-mentioned technical methods, the roller has good structural consistency, which can improve the structural strength between the roller body and the rotating shaft.

[0016] In some embodiments of this application, the adjusting component is disposed at at least one end of the axial direction of the roller.

[0017] In the above-mentioned technical methods, the number of components can be adjusted according to actual needs, which provides good flexibility.

[0018] In some embodiments of this application, the bracket includes a bracket body and a bearing seat disposed on the side of the bracket body. A bearing is disposed in the bearing seat, and the bearing includes a first ring, a second ring, and a plurality of balls. The first ring is located radially outside the second ring and is fixedly connected to the bearing seat. The second ring has the shaft hole for fixedly connecting to the roller. The plurality of balls are disposed between the first ring and the second ring to allow the first ring and the second ring to rotate relative to each other.

[0019] In the above-mentioned technical method, the roller can be well mounted on the bearing housing through the bearing, and the roller can effectively transmit the force to the bearing. By increasing the friction between the first ring and the ball bearing, and the friction between the second ring and the ball bearing, the speed reduction of the roller can be effectively achieved. The first ring, the second ring and the ball bearing have high structural strength and are not easily damaged, thereby reliably improving the reliability of the electrode traction device.

[0020] In some embodiments of this application, the electrode traction device further includes: an image acquisition device for identifying flatness information of the electrode, and an adjustment component for increasing or decreasing the frictional force between the roller and the wall of the shaft hole according to the flatness information.

[0021] In the above-mentioned technical approach, the roller speed can be controlled in real time according to the actual situation through the cooperation of image acquisition device and controller, which has high reliability and strong practicality.

[0022] Secondly, embodiments of this application provide a battery production line, which includes the electrode traction device of the first aspect of this application.

[0023] In the above-described technical approach, the battery production line, by setting up the electrode traction device of the above embodiment, can flexibly control the frictional force when the roller rotates by adjusting the component to apply a radial force towards the roller. In this way, the rotational speed of the roller can be adjusted according to actual needs, and the radial constraint of the roller can be increased. This can effectively weaken the eccentric runout amplitude of the roller, and the linear velocity of the roller surface around the entire circle tends to be uniform, so that the tension of the electrode sheet in all transverse directions is flattened. This can effectively alleviate the wrinkles caused by the difference in linear velocity of the roller surface, and has good reliability and stability.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the electrode traction device provided in the first embodiment of this application.

[0026] Figure 2 The diagram shows the structure of a bracket provided in some embodiments of this application and an example of a second magnetic element.

[0027] Figure 3 The diagram shows the structure of the roller provided in some embodiments of this application.

[0028] Figure 4 This is a schematic diagram of the electrode traction device provided in the second embodiment of this application.

[0029] Figure 5 A schematic diagram of a bracket provided in some embodiments of this application and another example of a second magnetic element structure.

[0030] Figure label: 100. Electrode traction device; 1. Support; 11. Support body; 12. Bearing seat; 2. Overhead roller; 21. Roller body; 22. Rotating shaft; 3. Adjustment assembly; 31. First magnetic suction component; 32. Second magnetic suction component. Detailed Implementation

[0031] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0034] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0036] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two).

[0037] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] Coating is one of the core key processes in lithium battery manufacturing. Electrode coating specifically involves uniformly coating a well-stirred electrode slurry onto the surface of a substrate, followed by drying to remove organic solvents from the slurry. During the traction process, uneven force distribution along the travel direction can easily lead to electrode wrinkling defects. Related technologies often employ active contact damping structures, using damping rollers to transmit damping force and reduce roller speed, performing low-speed lateral stretching on the wrinkled areas of the electrode to release localized stress and improve the wrinkling problem. However, this technology suffers from fixed torque, poor adjustment flexibility, and wear and tear on the contact damping rollers over long-term operation, leading to a continuous decline in damping performance and difficulty in ensuring stability.

[0040] Based on the above considerations, in order to improve the adjustment flexibility of the adjustment component and the stability of the damping performance, the applicant, after in-depth research, designed an electrode traction device. By applying a radial force to the roller through the adjustment component, the frictional force during the rotation of the roller can be flexibly controlled. Thus, the rotational speed of the roller can be adjusted according to actual needs. At the same time, the radial direction of the roller is constrained, which can effectively weaken the eccentric runout amplitude of the roller. The linear velocity of the roller surface tends to be uniform throughout the entire circle, so that the tension in all parts of the electrode in the lateral direction is flattened. This can effectively alleviate the wrinkles caused by the difference in linear velocity of the roller surface, and has good reliability and stability.

[0041] The following is for reference. Figures 1-5 Describes an electrode traction device 100 according to an embodiment of the first aspect of this application.

[0042] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the electrode traction device 100 provided in the first embodiment of this application. Figure 2 The diagram shows the structure of a bracket provided in some embodiments of this application and an example of a second magnetic element.

[0043] In some embodiments of this application, such as Figure 1 and Figure 2As shown, the electrode traction device 100 includes a support 1, a roller 2, and an adjustment component 3. The support 1 has a shaft hole, and the end of the roller 2 is rotatably disposed in the shaft hole. The roller 2 is used to traction the electrode. The adjustment component 3 is disposed between the support 1 and the roller 2. The adjustment component 3 is used to apply a force in the radial direction toward the roller 2 to increase or decrease the friction force when the roller 2 rotates.

[0044] In other words, both ends of the roller 2 can be rotatably connected to the shaft holes on the bracket 1. After the electrode sheet is unwound by the unwinding mechanism, it can be conveyed downstream through the roller 2. For example, the roller 2 is a passive roller. The roller 2 rotates under the drive of the electrode sheet. For example, when there are slight circular deviations or wear on the roller surface at different positions of the roller surface of the roller 2, the rotating roller 2 will produce continuous radial circular runout. The instantaneous linear velocity at different positions of the roller surface is different, which makes it easy for the electrode sheet that is in close contact with the roller surface to be segmented in terms of tightness. On the roller 2, the electrode sheet in the section with a high linear velocity is tighter, and the electrode sheet in the section with a low linear velocity is looser. The roller 2 can be driven to move in the radial direction by the adjusting component 3, thereby increasing the friction force when the roller 2 rotates. In addition, it can also provide better radial constraint to the roller 2, which can better alleviate the wrinkling problem caused by the difference in linear velocity at different positions of the roller surface of the roller 2, thereby improving the reliability of the roller 2 when conveying the electrode sheet.

[0045] This application adjusts the friction force of the roller 2 by applying a radial force to the roller 2 through the adjusting component 3, thereby reducing the rotational speed of the roller 2. This can effectively alleviate the wrinkling problem caused by the difference in linear speed at different positions on the circumference of the roller 2. Furthermore, this application can flexibly control the magnitude of the force applied by the adjusting component 3 to the roller 2 according to actual needs, thereby better controlling the magnitude of the friction force when the roller 2 rotates. It has good flexibility, and the adjustment of the rotational speed of the roller 2 will not result in a continuous decay of damping performance, thus improving the reliability and stability of the rotational speed control of the roller 2.

[0046] like Figure 1 As shown, the adjustment assembly 3 includes a first magnetic attractor 31, a second magnetic attractor 32, and a controller. The first magnetic attractor 31 is disposed on the roller 2, and the second magnetic attractor 32 is disposed on the support 1 and spaced apart from the first magnetic attractor 31 in the radial direction of the roller 2. The controller is used to control the first magnetic attractor 31 and / or the second magnetic attractor 32 so that the first magnetic attractor 31 and the second magnetic attractor 32 attract or repel each other.

[0047] In other words, when wrinkles appear on the electrode sheet, the first magnetic 31 and the second magnetic 32 can attract or repel each other. For ease of description, this application takes the attraction of the first magnetic 31 and the second magnetic 32 as an example. When the first magnetic 31 and the second magnetic 32 attract each other, the frictional force of the roller 2 increases under the action of magnetic force, which can better rub and consume the kinetic energy of the roller 2, thereby reducing the rotational speed of the roller 2. The greater the frictional force between the roller 2 and the hole surface of the shaft hole, the more kinetic energy of the roller 2 is lost, and the lower the rotational speed of the roller 2. Similarly, the smaller the frictional force when the roller 2 rotates, the less kinetic energy is lost, and the higher the rotational speed of the roller 2.

[0048] In addition, the first magnetic suction member 31 and the second magnetic suction member 32 do not contact each other, and the first magnetic suction member 31 and the second magnetic suction member 32 will not suffer frictional damage. Thus, they can provide a relatively stable radial force toward the roller 2. Therefore, compared with the active contact damping structure in the related technology, this application does not have the problem of the active contact damping structure being affected by wear, thus improving the reliability of the electrode traction device 100.

[0049] In the above-mentioned technical method, by applying a radial force to the roller 2 through the adjusting component 3, the frictional force during the rotation of the roller 2 can be flexibly controlled, and the rotational speed of the roller 2 can be adjusted according to actual needs. At the same time, the radial direction of the roller 2 is constrained, which can effectively weaken the eccentric runout amplitude of the roller 2. The linear velocity of the roller surface of the roller 2 tends to be uniform throughout the circle, so that the tension in all parts of the electrode sheet in the lateral direction is flattened. This can effectively alleviate the wrinkles caused by the difference in linear velocity of the roller surface of the roller 2, and has good reliability and stability. Through the first magnetic suction component 31 and the second magnetic suction component 32 that provide force without contact, the frictional force during the rotation of the roller 2 can be effectively increased, thereby effectively reducing the rotational speed of the roller 2 and achieving high reliability.

[0050] In some embodiments of this application, at least one of the first magnetic accumulator 31 and the second magnetic accumulator 32 is an electromagnetic element, and the controller is electrically connected to the electromagnetic element to change the magnetism of the electromagnetic element; or, the first magnetic accumulator 31 and the second magnetic accumulator 32 are both permanent magnet elements, and the controller is drively connected to the first magnetic accumulator 31 and / or the second magnetic accumulator 32 to drive the first magnetic accumulator 31 and / or the second magnetic accumulator 32 to rotate.

[0051] Reference Figure 1 As shown, exemplarily, the first magnetic attractor 31 can be an electromagnetic component, and the second magnetic attractor 32 can be a permanent magnet component. Thus, in the two embodiments described above, the permanent magnet component can be energized, causing the permanent magnet component and the electromagnetic component to attract or repel each other, thereby increasing the frictional force when the roller 2 rotates.

[0052] For example, both the first magnetic attractor 31 and the second magnetic attractor 32 can be permanent magnets. Therefore, by driving the first magnetic attractor 31 to rotate, the first magnetic attractor 31 and the second magnetic attractor 32 can be positioned in a state where they neither attract nor repel each other. When it is necessary to increase the frictional force when the roller 2 rotates, the first magnetic attractor 31 can be driven to rotate, thereby placing the first magnetic attractor 31 and the second magnetic attractor 32 in an attractive or repulsive position. Similarly, the second magnetic attractor 32 can also be driven to rotate, so that the first magnetic attractor 31 and the second magnetic attractor 32 can be placed in an attractive or repulsive position as needed. This application will not elaborate on this further.

[0053] In the above technical method, the types of the first magnetic suction component 31 and the second magnetic suction component 32 can be set according to actual needs, so as to better apply radial force to the roller 2, thereby better controlling the friction force when the roller 2 rotates, and providing good flexibility.

[0054] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of the roller 2 provided in some embodiments of this application.

[0055] In some embodiments of this application, the roller 2 includes a roller body 21 and a rotating shaft 22 coaxially connected to the roller body 21, and a first magnetic suction member 31 is disposed on the roller body 21 and / or the rotating shaft 22.

[0056] Exemplarily, the first magnetic attractor 31 can be disposed on the roller body 21, or on the rotating shaft 22, or simultaneously on both the roller body 21 and the rotating shaft 22; this application does not impose any limitations on this. Furthermore, the first magnetic attractor 31 can be disposed on the surface of the roller body 21 or the rotating shaft 22, or internally within the roller body 21 or the rotating shaft 22; this application also does not impose any limitations on this.

[0057] In the above-mentioned technical approach, the position of the first magnetic accumulator 31 can be set according to actual needs, which provides good flexibility.

[0058] In some embodiments of this application, such as Figures 1-3 As shown, the first magnetic suction member 31 is formed as an annular ring sleeved on the outer peripheral surface of the roller 2, or multiple first magnetic suction members 31 are provided, and multiple first magnetic suction members 31 are evenly spaced around the axis of the roller 2 on the outer peripheral surface of the roller 2.

[0059] like Figure 3As shown, the first magnetic attractor 31 is formed as an annular ring sleeved on the outer peripheral surface of the roller 2. In other examples, the first magnetic attractor 31 may also be arranged in a block shape on the outer peripheral side of the roller 2. The block-shaped first magnetic attractor 31 may be an arc shape around the axis of the roller 2, or it may be a cuboid. This application does not limit this.

[0060] In the above-mentioned technical method, by arranging the first magnetic attractor 31 around the axis of the roller 2, the second magnetic attractor 32 can better attract or repel the first magnetic attractor 31 during the rotation of the roller 2, thereby better increasing the friction force when the roller 2 rotates.

[0061] In some embodiments of this application, such as Figures 1-3 As shown, the second magnetic attractor 32 is formed in an arc shape coaxial with the roller 2. Therefore, the second magnetic attractor 32 can apply a force to the roller 2 radially, thereby making the rotation of the roller 2 more stable.

[0062] For example, the central angle of the second magnetic member 32 can be 30°, 45°, 60°, 80°, 90°, 110°, 120°, 150°, 160°, 180°, etc., and this application does not limit it.

[0063] In some embodiments of this application, the roller 2 is a one-piece molded part.

[0064] In other words, the roller 2 can be constructed by integral molding of the roller body 21 and the rotating shaft 22. The roller body 21 has rotating shafts 22 at both axial ends. Therefore, the roller 2 can have good structural consistency, thereby improving the structural strength between the roller body 21 and the rotating shaft 22.

[0065] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of the electrode traction device 100 provided in the second embodiment of this application.

[0066] In some embodiments of this application, the adjusting component 3 is disposed at at least one end of the axial direction of the roller 2.

[0067] In other words, the adjustment component 3 can be provided only at one end of the axial direction of the roller 2, or it can be provided at both ends of the axial direction of the roller 2. Further, in the above example, the adjustment component 3 may include a first magnetic suction member 31 and a second magnetic suction member 32, such as... Figures 1-3 As shown, the first magnetic suction element 31 can be provided only at one end of the axial direction of the roller 2, which can simplify the structure of the electrode traction device 100 and reduce the production cost of the electrode traction device 100. Further as... Figure 4As shown, a first magnetic suction element 31 can be provided at both ends of the axial direction of the roller 2. Thus, by adjusting the components 3 at both ends of the axial direction of the roller 2, the same or different forces can be applied to both ends of the axial direction of the roller 2 according to actual needs, thereby better alleviating the problem of wrinkling of the electrode sheet and improving the practicality of the electrode sheet traction device 100.

[0068] In the above technical approach, the number of components 3 can be adjusted according to actual needs, which provides good flexibility.

[0069] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the bracket 1 includes a bracket body 11 and a bearing seat 12 disposed on the side of the bracket body 11. The bearing seat 12 is provided with a bearing, which includes a first ring, a second ring and a plurality of balls. The first ring is located radially outside the second ring and is used to fix it to the bearing seat 12. The second ring has a shaft hole for fixing it to the roller 2. The plurality of balls are disposed between the first ring and the second ring to allow the first ring and the second ring to rotate relative to each other.

[0070] For example, the first ring can be fixedly connected to the bearing housing 12 by interference fit, or the first ring can be fixedly connected to the bearing housing 12 by welding, bonding or other means. Similarly, the second ring can be fixedly connected to the roller 2 by interference fit, or the second ring can be fixedly connected to the roller 2 by welding, bonding or other means. This application does not limit this.

[0071] When the roller 2 rotates relative to the bearing housing 12, it is actually through the relative rotation between the first ring and the second ring. Thus, when the adjusting component 3 applies a force along its radial direction to the roller 2, it can increase the friction between the first ring and the ball and the friction between the second ring and the ball. The first ring, the second ring and the ball have high structural strength and are not easily damaged, thereby improving the reliability of the electrode traction device 100 more reliably.

[0072] In the above-mentioned technical method, the roller 2 can be well mounted on the bearing housing 12 through the bearing, and the roller 2 can effectively transmit the force to the bearing. By increasing the friction between the first ring and the ball bearing, and the friction between the second ring and the ball bearing, the speed reduction of the roller 2 can be effectively achieved. The first ring, the second ring and the ball bearing have high structural strength and are not easily damaged, thereby reliably improving the reliability of the electrode traction device 100.

[0073] Alternatively, a bearing may not be provided between the bearing housing 12 and the roller 2. When a force is applied towards the roller 2, the friction between the bearing housing 12 and the roller 2 in direct contact increases. Although this will cause mutual wear between the bearing housing 12 and the roller 2, it can still reduce the speed of the roller 2. Furthermore, mutual wear between the bearing housing 12 and the roller 2 can be reduced by improving the structural strength of the bearing housing 12 and the roller 2, etc., and this application does not impose any limitations on this.

[0074] In some embodiments of this application, the electrode traction device 100 further includes an image acquisition device for identifying the flatness information of the electrode, and an adjustment component 3 for increasing or decreasing the friction force when the roller 2 rotates according to the flatness information.

[0075] In the above-mentioned technical method, the rotational speed of the roller 2 can be controlled in real time according to the actual situation through the cooperation of the image acquisition device and the controller, which has high reliability and strong practicality.

[0076] refer to Figure 4 As shown in a specific example, the electrode traction device 100 includes a support 1, a roller 2, and an adjustment assembly 3. The support 1 has a shaft hole, and the end of the roller 2 is rotatably disposed in the shaft hole. The roller 2 is used to traction the electrode. The adjustment assembly 3 includes a first magnetic attractor 31, a second magnetic attractor 32, and a controller. The first magnetic attractor 31 is a permanent magnet, the second magnetic attractor 32 is an electromagnetic component, and the controller is an electromagnetic regulator. The first magnetic attractor 31 is disposed on the roller 2, and the second magnetic attractor 32 is disposed on the support 1 and spaced apart from the first magnetic attractor 31 along the radial direction of the roller 2.

[0077] The guide roller 2 includes a roller body 21 and a rotating shaft 22 coaxially connected to the roller body 21. A first magnetic suction member 31 is disposed on the rotating shaft 22. The first magnetic suction member 31 is formed as an annular ring sleeved on the outer circumferential surface of the guide roller 2, and the second magnetic suction member 32 is formed as an arc coaxial with the guide roller 2. Adjustment components 3 are disposed at both ends of the guide roller 2 along its axial direction. The support 1 includes a support body 11 and a bearing seat 12 disposed on the side of the support body 11. A bearing is disposed inside the bearing seat 12. The bearing includes a first ring, a second ring, and a plurality of balls. The first ring is located radially outside the second ring and is used to fix it to the bearing seat 12. The second ring has a shaft hole for fixing it to the guide roller 2. The plurality of balls are disposed between the first ring and the second ring to allow the first ring and the second ring to rotate.

[0078] The image acquisition device is fixed on one radial side of the roller 2. The image acquisition device can be a camera, and the camera lens can be directly facing the electrode plate on the roller 2. The image acquisition device can be connected to the control unit through a data cable. The control unit is connected to the electromagnetic regulator through a signal cable to realize the adjustment of the electromagnetic force.

[0079] In the above-mentioned technical method, a separate electromagnetic damping force device is used. The magnitude of the magnetic force is controlled by an electromagnetic regulator. Utilizing the principle of attraction between opposite magnetic poles and repulsion between like magnetic poles, the magnitude of the force is dynamically controlled by the magnetic force to regulate and reduce the rotational speed of the roller 2. At the same time, the radial direction of the roller is constrained, which can effectively weaken the eccentric runout amplitude of the roller 2. The linear velocity of the roller surface of the roller 2 tends to be uniform throughout the circle, so that the tension of the pole sheet is flattened in all directions. This can effectively alleviate the wrinkles caused by the difference in linear velocity of the roller surface of the roller 2.

[0080] Further, please refer to Figure 5 , Figure 5 A schematic diagram of the structure of a bracket provided in some embodiments of this application and another example of a second magnetic element. Figure 5 In this application, the second magnetic attractor 32 can also be plate-shaped, and it is understood that the second magnetic attractor 32 can also have other structural forms, which are not limited in this application.

[0081] Secondly, embodiments of this application provide a battery production line, which includes the electrode traction device 100 of the first aspect of this application.

[0082] In the above-described technical approach, the battery production line, by setting up the electrode traction device 100 of the above embodiment, can flexibly control the friction between the roller 2 and the hole surface of the shaft hole by adjusting the component 3 to apply a radial force towards the roller 2. In addition, the rotational speed of the roller 2 can be adjusted according to actual needs, and the radial constraint of the roller 2 can be increased. This can effectively weaken the eccentric runout amplitude of the roller 2, and the linear velocity of the roller surface of the roller 2 tends to be uniform throughout the circle, so that the tension of the electrode sheet is flattened in all directions in the lateral direction. This can effectively alleviate the wrinkles caused by the difference in linear velocity of the roller surface of the roller 2, and has good reliability and stability.

[0083] For example, the processing technology for conveying electrode sheets in a battery production line may include coating, rolling, slitting, and winding. The electrode sheet traction device 100 of the above embodiments can be set on the processing equipment of the above multiple processes. Taking the coating process as an example, the battery production line may include coating equipment, and the coating equipment may be equipped with the electrode sheet traction device 100 of the above embodiments. Therefore, the electrode sheet traction device 100 of the above embodiments can also be set on processing equipment such as rolling equipment, slitting equipment, and winding equipment. This application does not limit this.

[0084] The electrode traction device 100 and other components and operations of the battery production line according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0085] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0086] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrode traction device, characterized in that, include: A bracket (1) having a shaft hole; A guide roller (2) is provided at the end of which is rotatably disposed in the shaft hole. The guide roller (2) is used to pull the electrode sheet. An adjusting assembly (3) is disposed between the support (1) and the guide roller (2) to apply a radial force toward the guide roller (2) to increase or decrease the frictional force when the guide roller (2) rotates. The adjusting assembly (3) includes: A first magnetic suction element (31) is disposed on the roller (2); The second magnetic suction member (32) is disposed on the bracket (1) and spaced apart from the first magnetic suction member (31) in the radial direction of the roller (2); A controller is used to control the first magnetic attractor (31) and / or the second magnetic attractor (32) to make the first magnetic attractor (31) and the second magnetic attractor (32) attract or repel each other.

2. The electrode traction device according to claim 1, characterized in that, At least one of the first magnetic attractor (31) and the second magnetic attractor (32) is an electromagnetic component, and the controller is electrically connected to the electromagnetic component to change the magnetism of the electromagnetic component, or... Both the first magnetic chuck (31) and the second magnetic chuck (32) are permanent magnets. The controller is connected to the first magnetic chuck (31) and / or the second magnetic chuck (32) for driving the first magnetic chuck (31) and / or the second magnetic chuck (32) to rotate.

3. The electrode traction device according to claim 1, characterized in that, The roller (2) includes a roller body (21) and a rotating shaft (22) coaxially connected to the roller body (21), and the first magnetic suction member (31) is disposed on the roller body (21) and / or the rotating shaft (22).

4. The electrode traction device according to claim 1, characterized in that, The first magnetic suction element (31) is formed as an annular ring fitted onto the outer peripheral surface of the roller (2), or, Multiple first magnetic suction elements (31) are provided, and multiple first magnetic suction elements (31) are evenly spaced around the axis of the roller (2) on the outer peripheral surface of the roller (2).

5. The electrode traction device according to claim 1, characterized in that, The second magnetic suction element (32) is formed in an arc shape coaxial with the roller (2).

6. The electrode traction device according to claim 1, characterized in that, The roller (2) is a one-piece molded part.

7. The electrode traction device according to claim 1, characterized in that, The adjustment component (3) is disposed at at least one end of the axial direction of the roller (2).

8. The electrode traction device according to claim 1, characterized in that, The bracket (1) includes a bracket body (11) and a bearing seat (12) disposed on the side of the bracket body (11). A bearing is disposed in the bearing seat (12). The bearing includes a first ring, a second ring and a plurality of balls. The first ring is located radially outside the second ring and is fixedly connected to the bearing seat (12). The second ring has the shaft hole and is fixedly connected to the roller (2). The plurality of balls are disposed between the first ring and the second ring to allow the first ring and the second ring to rotate relative to each other.

9. The electrode traction device according to claim 1, characterized in that, The electrode traction device further includes an image acquisition device for identifying the flatness information of the electrode, and an adjustment component (3) for increasing or decreasing the friction between the roller (2) and the hole wall of the shaft hole according to the flatness information.

10. A battery production line, characterized in that, The electrode traction device includes any one of claims 1-9.

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