Pole piece non-contact electromagnetic flattening system and pole piece flattening method thereof

Abstract

The invention relates to a pole piece non-contact electromagnetic flattening system and a pole piece flattening method thereof. The pole piece non-contact electromagnetic flattening system comprises an electromagnetic flattening module and a power supply control module, the electromagnetic flattening module comprises two flattening devices, and the two flattening devices are arranged at an interval in the width direction of the pole piece; the flattening device comprises at least two flattening mechanisms, the at least two flattening mechanisms are arranged at intervals, and a flattening channel for the pole piece to pass through is formed between the at least two flattening mechanisms; the flattening mechanism comprises an iron core and a plurality of coils, and the plurality of coils are wound outside the iron core according to a three-phase winding structure; the power supply control module supplies three-phase alternating current to the plurality of coils, so that the flattening channel generates a traveling wave magnetic field; and the power supply control module adjusts the intensity of the traveling wave magnetic field borne by the pole piece in the flattening channel by adjusting the frequency and voltage of the three-phase alternating current. According to the scheme provided by the invention, when the pole piece is flattened, the electromagnetic force borne by the pole piece is more stable, and the flattening effect of the pole piece is improved.

Description

Technical Field

[0001] The present application relates to the field of pole piece processing technology, and in particular to a pole piece non-contact electromagnetic flattening system and a pole piece flattening method thereof. Background Art

[0002] During the processing of the pole piece, it is necessary to flatten the pole piece to prevent the wrinkles on the pole piece from affecting the assembly of the pole piece. Most of the contact flattening devices on the market use threaded rollers or arc rollers to flatten the pole piece by using the friction between the roller surface of the threaded roller or arc roller and the pole piece.

[0003] In the related art, Chinese patent CN202410948341.5 discloses a non-contact pole piece electromagnetic flattening method and its flattening device. This patent uses a power control structure to control the alternating supply of alternating current to multiple electromagnet groups along the arrangement direction of multiple electromagnet groups. The alternating magnetic field generated by the alternating current moves within the magnetic field movement area according to the excitation and energization sequence of the multiple electromagnet groups, so that the current collector is flattened non-contactly. However, since the electromagnet groups are alternately supplied with alternating current in sequence, the multiple electromagnet groups are connected to square wave currents, and the multiple coils are independent of each other, the magnetic field generated is not stable, resulting in the electromagnetic force on the pole piece not changing smoothly over time. There is a sense of frustration when the pole piece is flattened, which affects the flattening effect of the pole piece. Summary of the Invention

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a non-contact electromagnetic flattening system for a pole piece and a pole piece flattening method thereof, which can make the electromagnetic force acting on the pole piece more stable when flattening the pole piece, thereby improving the flattening effect of the pole piece.

[0005] According to a first aspect of the present application, there is provided a non-contact electromagnetic flattening system for a pole piece, comprising an electromagnetic flattening module and a power supply control module; the electromagnetic flattening module comprises two flattening devices, which are spaced apart in the width direction of the pole piece; the flattening device comprises at least two flattening mechanisms, which are spaced apart from each other, and a flattening channel for passing the pole piece is formed between the at least two flattening mechanisms; the flattening mechanism comprises an iron core and a plurality of coils, which are wound around the outside of the iron core in a three-phase winding structure; the power supply control module supplies three-phase alternating current to the plurality of coils so that the flattening channel generates a traveling wave magnetic field; the directions of the currents supplied by the power supply control module to the two flattening devices are opposite; the power supply control module adjusts the frequency and voltage of the three-phase alternating current to adjust the intensity of the traveling wave magnetic field received by the pole piece in the flattening channel.

[0006] Furthermore, the pole piece non-contact electromagnetic flattening system also includes a detection system and a data processing system. The detection system is used to detect the tape-walking status of the pole piece and send the detection result to the data processing system. The data processing system outputs the control quantity according to the detection result of the detection system and sends the control quantity to the power control module. The power control module adjusts the frequency and voltage of the three-phase alternating current according to the control quantity.

[0007] Furthermore, the iron core includes a main body and multiple iron teeth, the main body is in the shape of a long strip, the iron teeth are connected to the main body, the multiple iron teeth are distributed at intervals along the length direction of the main body, and the multiple coils are wound outside the iron teeth according to the three-phase winding structure.

[0008] Furthermore, the main body is provided with a plurality of cooling grooves, and the cooling grooves are located on a side of the main body facing away from the iron teeth; the electromagnetic flattening module also includes a cooling mechanism, and the cooling mechanism includes a cooling pipe, and the cooling pipe passes through the cooling grooves and conducts heat with the main body.

[0009] Furthermore, the flattening mechanism includes at least two iron cores and magnetic conductive parts, at least two of the iron cores are arranged side by side along the length direction of the main body, and two adjacent iron cores are connected by magnetic conductive parts. The power control module includes multiple three-phase power supplies, and the three-phase power supplies correspond one-to-one to the main body. The coil on each iron core is powered by one of the three-phase power supplies.

[0010] Furthermore, the plurality of coils are wound outside the core in a structure of single-wire double-layer short-pitch winding, single-wire single-layer short-pitch winding, single-wire double-layer full-pitch winding, double-wire single-layer full-pitch winding, double-wire double-layer full-pitch winding or double-wire double-layer short-pitch winding.

[0011] Furthermore, one end of the main body away from the center line of the pole piece is inclined toward the running direction of the pole piece.

[0012] Furthermore, the flattening mechanism further includes an electromagnetic shielding shell, which covers the opposite ends of the iron core and the area of the iron core where the coil is wound outside one side of the iron tooth.

[0013] A second aspect of the present application provides a pole piece flattening method, using the pole piece non-contact electromagnetic flattening system, which comprises the following steps: Make the electrode piece pass through the flattening channel, and make one end of the electrode piece in the width direction enter one of the flattening devices, and the other end of the electrode piece in the width direction enter the other flattening device; The power control module supplies three-phase current to each flattening mechanism respectively, and the three-phase currents supplied to two flattening mechanisms in the same flattening mechanism have the same direction; A three-phase current is passed through the coil to generate a traveling wave magnetic field in the flattened channel. The traveling wave magnetic field induces eddy currents in the collector of the pole piece. The eddy currents interact with the traveling wave magnetic field to generate an electromagnetic force facing away from the other flattened channel. The pole piece is flattened in the width direction of the pole piece under the action of electromagnetic force.

[0014] Furthermore, the direction of the traveling wave magnetic field is made to form an acute angle with the running direction of the pole piece, and by adjusting the frequency of the traveling current and / or the angle between the direction of the traveling wave magnetic field and the running direction of the pole piece, the component velocity of the traveling wave magnetic field in the running direction of the pole piece is made equal to the running speed of the pole piece.

[0015] The technical solution provided by the present application may include the following beneficial results: three-phase alternating current is passed through a power supply control module to multiple coils to generate a traveling wave magnetic field in the flattening channel. When the pole piece passes through the flattening channel, eddy currents are induced in the current collector of the pole piece. The size of the traveling wave magnetic field is controlled by the power supply control module, and the pole piece is flattened by electromagnetic force. The entire process does not contact the surface of the pole piece and does not damage the slurry coating on the surface of the pole piece. It is suitable for the flattening of wet pole pieces, semi-dry pole pieces, and dry pole pieces, and the traveling wave magnetic field can be dynamically adjusted according to the degree of wrinkling of the pole piece. The size of the electromagnetic force acting on the pole piece can be adjusted more smoothly, thereby improving the flattening accuracy of the pole piece and thus improving the quality of the finished product of the pole piece.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0018] Figure 1 Schematic diagram of the structure of the electromagnetic flattening module shown in the embodiment of the present application; Figure 2 yes Figure 1 Schematic diagram of the corresponding traveling wave magnetic field; Figure 3 Schematic diagram of a three-phase sinusoidal alternating current curve shown in an embodiment of the present application; Figure 4 is a structural schematic diagram of a flattening mechanism shown in an embodiment of the present application; Figure 5 It is a structural diagram of the main body shown in the embodiment of the present application; Figure 6 Schematic diagram of the structure of the iron core shown in the embodiment of the present application; Figure 7Schematic diagram of the structure of a single-wire double-layer short-distance winding shown in an embodiment of the present application; Figure 8 1 is another structural schematic diagram of a single-wire double-layer short-distance winding shown in an embodiment of the present application; Figure 9 Schematic diagram of the structure of a single-wire single-layer short-distance winding shown in an embodiment of the present application; Figure 10 Schematic diagram of the structure of a single-wire single-layer full-pitch winding shown in an embodiment of the present application; Figure 11 Schematic diagram of the structure of a double-wire single-layer short-distance winding shown in an embodiment of the present application; Figure 12 Schematic diagram of the structure of a double-wire double-layer short-spacing winding shown in an embodiment of the present application; Figure 13 1 is another structural schematic diagram of a double-wire double-layer short-spacing winding shown in an embodiment of the present application; Figure 14 It is a flow chart of the pole piece flattening method shown in an embodiment of the present application.

[0019] Figure markings: flattening mechanism 1; iron core 11; main body 111; iron teeth 112; cooling groove 113; coil 12; electromagnetic shielding shell 13; first coil 121; second coil 122; third coil 123; fourth coil 124; fifth coil 125; sixth coil 126; first tooth slot 141; second tooth slot 142; third tooth slot 143; fourth tooth slot 144; fifth tooth slot 145; sixth tooth slot 146; seventh tooth slot 147; flattening channel 2; pole piece 3; cooling tube 4. DETAILED DESCRIPTION

[0020] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0021] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0023] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0024] In related technologies, a power control structure controls the alternating flow of alternating current to multiple electromagnet groups along their arrangement. The alternating magnetic field generated by the alternating current moves within the magnetic field movement zone according to the order in which the electromagnet groups are energized, enabling contactless flattening of the current collector. However, because the alternating current is applied to the electromagnet groups in alternating order, and the multiple electromagnet groups are connected to square-wave current, the generated magnetic field is unstable. This causes the electromagnetic force acting on the pole piece to vary unevenly over time, resulting in a jerky feeling when the pole piece is flattened, which in turn affects the flattening effect.

[0025] In response to the above problems, an embodiment of the present application provides a non-contact electromagnetic flattening system for a pole piece and a pole piece flattening method thereof, which can make the change of the electromagnetic force acting on the pole piece smoother when flattening the pole piece, thereby improving the flattening effect of the pole piece.

[0026] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] See also Figure 1 The non-contact electromagnetic flattening system for the pole piece includes an electromagnetic flattening module and a power control module. The electromagnetic flattening module generates electromagnetic force on the pole piece 3 to flatten the pole piece 3. The power control module supplies power to the electromagnetic flattening module and adjusts the magnitude of the electromagnetic force on the pole piece 3.

[0028] See also Figure 1The electromagnetic flattening module includes two flattening devices, which are spaced apart along the width direction of the pole piece 3, wherein the maximum width of the pole piece 3 is less than the maximum length of the space occupied by the two flattening devices, ensuring that both ends of the pole piece 3 in the width direction can be affected by the flattening device before and after flattening. The flattening device includes at least two flattening mechanisms 1, which are spaced apart from each other, wherein at least one flattening mechanism 1 is located above another flattening mechanism 1, and a flattening channel 2 for passing the pole piece 3 is formed between the at least two flattening mechanisms 1. When the pole piece 3 passes through the flattening channel 2, the flattening mechanism 1 located above the pole piece 3 can act on the pole piece 3, and the flattening mechanism 1 located below the pole piece 3 can also act on the pole piece 3, so that the electromagnetic force applied to the pole piece 3 is more uniform. The two flattening devices each form a flattening channel 2, so that when the pole piece 3 is transmitted, both ends of the pole piece 3 in the width direction can be affected by the flattening mechanism 1. In some embodiments, the flattening device includes two flattening mechanisms 1, and the two flattening mechanisms 1 are mirror-symmetrical about the flattening channel 2; in some embodiments, the flattening device includes multiple flattening mechanisms 1, wherein two or more flattening mechanisms 1 are located above the pole piece 3, and all flattening mechanisms 1 located above the pole piece 3 are arranged side by side, and two or more flattening mechanisms 1 are located below the pole piece 3, and all flattening mechanisms 1 located below the pole piece 3 are arranged side by side, and the flattening mechanisms 1 located above and below are arranged one-to-one symmetrically about the flattening channel 2. Figure 1-3 The flattening mechanism 1 includes an iron core 11 and a plurality of coils 12, and the plurality of coils 12 are wound outside the iron core 11 in a three-phase winding structure. The power control module supplies three-phase alternating current to the plurality of coils 12, wherein the directions of the currents supplied by the power control module to the two flattening devices are opposite; for different flattening mechanisms 1, the three-phase alternating currents connected to the flattening mechanisms 1 are independent of each other. Preferably, each flattening mechanism 1 is supplied with at least one independent three-phase alternating current. When the coil 12 is supplied with three-phase alternating current, the flattening channel 2 generates a traveling wave magnetic field. At this time, if the pole piece 3 passes through the flattening channel 2, the traveling wave magnetic field will induce eddy currents in the current collector of the pole piece 3. The eddy currents interact with the traveling wave magnetic field to generate electromagnetic force, and the direction of the electromagnetic force is the direction from the flattening channel 2 where the pole piece 3 is located to the other flattening channel 2. Therefore, part of the pole piece 3 passing through the flattening channel 2 will stretch away from the other flattening channel 2 under the action of the electromagnetic force, thereby flattening the pole piece 3 to both ends in the width direction. Participate Figure 3 Since the power control module inputs three-phase alternating current to multiple coils 12, the three-phase alternating current in the coils 12 satisfies the three-phase sinusoidal alternating current curve distribution, and the traveling wave magnetic field generated by the flattening channel 2 is a sinusoidal wave magnetic field. Compared with the square wave magnetic field, the sinusoidal wave magnetic field is more stable, and the magnetic field change curve is smoother, and the electromagnetic force on the pole piece 3 will also change more smoothly.

[0029] See also Figure 1-3The power control module can adjust the frequency and voltage of the three-phase alternating current of the input coil 12, thereby adjusting the intensity of the traveling wave magnetic field received by the pole piece 3 in the flattening channel 2, and further adjusting the magnitude of the electromagnetic force received by the pole piece 3; when the degree of wrinkling of the pole piece 3 is large, the power control module can increase the intensity of the traveling wave magnetic field in the flattening channel 2 by adjusting the frequency and voltage of the three-phase alternating current of the input coil 12; when the degree of wrinkling of the pole piece 3 is small, the power control module can reduce the intensity of the traveling wave magnetic field in the flattening channel 2 by adjusting the frequency and voltage of the three-phase alternating current of the input coil 12.

[0030] In this application, three-phase alternating current is passed to multiple coils 12 through a power control module, so that a traveling wave magnetic field is generated in the flattening channel 2. When the pole piece 3 passes through the flattening channel 2, eddy currents are induced in the current collector of the pole piece 3. The size of the traveling wave magnetic field is controlled by the power control module, and the pole piece 3 is flattened by electromagnetic force. The entire process does not contact the surface of the pole piece 3 and does not damage the slurry coating on the surface of the pole piece 3. It is suitable for the flattening of wet pole pieces 3, semi-dry pole pieces 3, and dry pole pieces 3, and the traveling wave magnetic field can be dynamically adjusted according to the degree of wrinkling of the pole piece 3. The size of the electromagnetic force acting on the pole piece 3 can be adjusted more smoothly, the electromagnetic force acting on the pole piece is more stable, and the flattening accuracy of the pole piece 3 is improved, thereby improving the quality of the finished product of the pole piece 3.

[0031] See also Figure 1The pole piece non-contact electromagnetic flattening system also includes a detection system and a data processing system. The detection system is communicatively connected to the data processing system. The detection system is used to detect the tape-walking status of the pole piece. The detection system can send the detected tape-walking status data of the pole piece to the data processing system. The data processing system outputs a control quantity according to the detection result of the detection system; the data processing system is communicatively connected to the power supply control module. The data processing system can send the control quantity to the power supply control module. The power supply control module adjusts the frequency and voltage of the three-phase AC power according to the control quantity. The walking state of the pole piece includes at least the wrinkle profile of the pole piece 3, the surface morphology of the pole piece 3 and the surface image texture of the pole piece 3. The detection system includes at least a CCD camera. The CCD camera can photograph the pole piece 3 to detect the wrinkle profile of the pole piece 3 and obtain the surface morphology of the pole piece 3 and the surface image texture data of the pole piece 3. The data processing system determines whether the pole piece 3 needs to be flattened based on the wrinkle profile of the pole piece 3, the surface morphology of the pole piece 3 and the surface image texture data of the pole piece 3. If the pole piece 3 needs to be flattened, the data processing system outputs the control amount and sends it to the power control module. The power control module adjusts the electromagnetic force on both ends of the pole piece 3 in real time so that the opposite ends in the width direction of the pole piece 3 are subjected to electromagnetic force until the CCD camera detects that the wrinkles on the pole piece 3 are eliminated. The power control module controls the flattening device to stop applying electromagnetic force to the pole piece 3. Preferably, the detection system can detect the tape speed of the pole piece 3, the tape tension of the pole piece 3, the surface morphology of the pole piece 3, the image texture of the pole piece and the lateral offset of the pole piece in the width direction; specifically, the detection system includes a speed sensor, a tension sensor, a laser sensor and a CCD camera, the speed sensor is used to detect the tape speed of the pole piece 3, the tension sensor is used to detect the tape tension of the pole piece 3, the laser sensor is used to detect the lateral offset of the pole piece 3 in the width direction, the CCD camera is used to photograph the pole piece 3 to detect the wrinkle profile of the pole piece 3 and obtain the surface morphology of the pole piece 3 and the image texture data of the pole piece 3. The detection system can detect the tape speed of the pole piece 3, the tape tension of the pole piece 3 , the surface morphology of the pole piece 3, the surface image texture of the pole piece 3 and the lateral offset of the pole piece 3 in the width direction are sent to the data processing system, wherein the lateral offset of the pole piece 3 in the width direction is the distance between the position of the pole piece 3 during normal transmission in the flattening channel 2 and the actual offset of the pole piece 3 in the width direction during transmission in the flattening channel 2; the data processing system adopts the fuzzy control method to comprehensively calculate the wrinkle confidence of the pole piece according to the data detected by the detection system; when the wrinkle confidence of the pole piece exceeds the threshold, the data processing system adopts the RBF-PID adaptive control method to calculate and output the control quantity, and the data processing system transmits the control quantity to the inverter of the power control module, the inverter adjusts the V / f parameter, and the power control module adjusts the electromagnetic force at both ends of the pole piece 3 in real time according to the V / f parameter until the wrinkles on the pole piece 3 are dynamically eliminated; the data processing system records all the data generated during the entire process and adopts a neural network for learning.

[0032] See also Figure 4 The iron core 11 includes a main body 111 and a plurality of iron teeth 112. The main body 111 is in the shape of an elongated strip. In the upper and lower flattening mechanisms 1 of the same flattening mechanism, the extension direction of the main body 111 of the upper flattening mechanism 1 is parallel to the extension direction of the main body 111 of the lower flattening mechanism 1. When the pole piece 3 passes through the flattening channel 2, the upper surface of the pole piece 3 in the flattening channel 2 is parallel to the extension direction of the main body 111, ensuring that the pole piece 3 can be more evenly affected by the traveling wave magnetic field. The iron teeth 112 are connected to the main body 111. The plurality of iron teeth 112 are spaced apart along the length direction of the main body 111. The plurality of coils 12 are wound around the iron teeth 112 in a three-phase winding structure. Tooth slots are formed between two adjacent iron teeth 112, and the coils 12 pass through the tooth slots.

[0033] See also Figure 1 and Figure 5 In some embodiments, the main body 111 is provided with a plurality of cooling slots 113, located on the side of the main body 111 facing away from the iron teeth 112. The electromagnetic flattening module further includes a cooling mechanism comprising a cooling tube 4, which passes through the cooling slots 113 and contacts the main body 111. The cooling tube 4 can conduct heat to the main body 111 and circulate coolant through the cooling tube 4. The cooling tube 4 can be connected to an external liquid cooling device, thereby absorbing the heat generated by the main body 111 and the coil 12, thereby preventing the heat generated by long-term operation from affecting the normal operation of the flattening mechanism 1. Preferably, the iron teeth 112 are located on the side of the main body 111 facing the flattening channel 2, thereby preventing the cooling tube 4 from affecting the intensity of the traveling wave magnetic field. Preferably, the cooling mechanism further includes a temperature sensor, which is mounted on the iron core 11. The temperature sensor is used to detect the temperature of the iron core 11 and transmit the data to the cooling mechanism. The cooling mechanism dynamically adjusts the flow of coolant in the cooling tube 4 to maintain a constant temperature of the iron core 11 and ensure the normal operation of the flattening mechanism 1. In some embodiments, the flattening mechanism 1 can be cooled by air cooling.

[0034] See also Figure 4 and Figure 6The iron core 11 is made of stacked thin silicon steel sheets with low iron loss, and insulating material is coated between the silicon steel sheets. Compared with the whole iron core 11, the stacked silicon steel sheets can limit the eddy current to flow in a single sheet, reducing the eddy current loss in the iron core 11, thereby reducing the power consumption of the iron core 11. In some embodiments, the flattening mechanism 1 includes at least two iron cores 11 and magnetic conductive parts. At least two iron cores 11 are arranged side by side along the length direction of the main body 111. Two adjacent iron cores 11 are connected by magnetic conductive parts. The power control module includes multiple three-phase power supplies. The three-phase power supplies correspond to the iron cores 11 one by one. The coil 12 on each iron core 11 is powered by a three-phase power supply. An iron core 11 of a certain length can be used as an electromagnetic module alone. In actual production, modular assembly can be performed according to the width of the flattening mechanism 1. A suitable number of iron cores 11 are selected according to the width of the flattening mechanism 1 and arranged side by side. The two iron cores 11 are connected by a magnetic conductive part. The magnetic conductive part is made of a magnetic conductive material with a magnetic permeability close to that of the silicon steel sheet, so that the magnetic lines of force between different iron cores 11 are smoothed. At the same time, multiple three-phase power supplies can be used to independently power the coils 12 on different iron cores 11 to solve the high load problem of all coils 12 using a single power supply, thereby ensuring the stable output of the electromagnetic flattening performance.

[0035] See also Figure 4 、 Figure 7-13 , multiple coils 12 are wound around the iron core 11 in the structure of single-wire double-layer short-pitch winding, single-wire single-layer short-pitch winding, single-wire double-layer full-pitch winding, double-wire single-layer full-pitch winding, double-wire double-layer full-pitch winding or double-wire double-layer short-pitch winding. The iron core 11 can match different winding settings according to different flattening requirements, taking into account both winding energy consumption and flattening effect. Figure 1 For example, Figure 1The multiple coils 12 are wound around the iron core 11 with a single-wire double-layer short-distance winding structure. Specifically, the multiple coils 12 include at least a first coil 121, a second coil 122, a third coil 123, a fourth coil 124, a fifth coil 125, and a sixth coil 126. From left to right, the multiple tooth slots include a first tooth slot 141, a second tooth slot 142, a third tooth slot 143, a fourth tooth slot 144, a fifth tooth slot 145, a sixth tooth slot 146, and a seventh tooth slot 147; the head of the first coil 121 is located in the first tooth slot 141, and the first coil 121 goes from the first tooth slot 141 to the right across three iron teeth 112 and through the fourth tooth slot 144, and then surrounds to form a first loop; the head of the second coil 122 is located in the third tooth slot 143, and the second coil 122 goes from the third tooth slot 143 to the right across three iron teeth 11 2 and passes through the sixth tooth slot 146 before wrapping around to form a second loop; the head of the third coil 123 is located in the fifth tooth slot 145, and the third coil 123 wraps around three iron teeth 112 to the left from the fifth tooth slot 145 and passes through the second tooth slot 142 before wrapping around to form a third loop; the first coil 121, the second coil 122, and the third coil 123 are respectively connected to the A, B, and C input phases of the three-phase current; the head of the fourth coil 124 is located in the seventh tooth slot 147, and the tail of the fourth coil 124 shares the fourth tooth slot 144 with the tail of the first coil 121. At this time, the current directions of the two fourth coils 124 and the first coil 121 are the same. Similarly, the fifth coil 125 and the sixth coil 126 are arranged in sequence, and the fourth coil 124, the fifth coil 125, and the sixth coil 126 are respectively connected to the loop phases of the three-phase current; N groups are arranged in sequence until the winding of multiple coils 12 and the iron core 11 is completed. In some embodiments, the end of the main body 111 away from the center line of the pole piece 3 is tilted toward the running direction of the pole piece 3, so that the direction of the traveling wave magnetic field generated by the flattening mechanism 1 forms an acute angle with the running direction of the pole piece 3, and the direction of the component velocity of the traveling wave magnetic field generated by the flattening mechanism 1 is the same as the running speed direction of the pole piece 3, thereby reducing the resistance of the traveling wave magnetic field to the running of the pole piece 3. Preferably, the detection system also includes an angle sensor, which can detect the angle between the center line of the pole piece 3 and the extension direction of the main body 111. The flattening mechanism 1 dynamically adjusts the relative angle between the center line of the pole piece 3 and the extension direction of the main body 111 based on the data detected by the angle sensor, so that the component velocity of the traveling wave magnetic field in the running direction of the pole piece 3 is equal to the running speed of the pole piece 3, thereby eliminating the obstructive effect of the traveling wave magnetic field on the running of the pole piece 3, thereby only forming an electromagnetic force along the width direction of the pole piece 3.

[0036] See also Figure 1The flattening mechanism 1 also includes an electromagnetic shielding shell 13, which is made of a material with high electrical conductivity and high magnetic permeability. The electromagnetic shielding shell 13 is sleeved on the outside of the main body 111, and the electromagnetic shielding shell 13 covers the two opposite ends of the iron core 11 in the length direction. The electromagnetic shielding shell 13 also covers the area on the iron core 11 where the coil 12 is wound on the side other than the iron tooth 112. The electromagnetic shielding shell 13 does not extend into the flattening channel 2. The electromagnetic shielding shell 13 can effectively isolate the two opposite ends of the iron core 11 in the length direction and the magnetic field diffusion on the side of the iron core 11 away from the flattening channel 2, thereby solving the edge effect in the flattening device and improving the stability of the electromagnetic force.

[0037] See also Figure 1 and Figure 14 An embodiment of the present application further provides a pole piece flattening method, which uses a pole piece non-contact electromagnetic flattening system. The pole piece flattening method includes the following steps: S01. Make the electrode 3 pass through the flattening channel 2, and make one end of the electrode 3 in the width direction enter one of the flattening devices, and the other end of the electrode 3 in the width direction enter the other flattening device; wherein one end of the electrode 3 in the width direction does not exceed the side of one of the flattening mechanisms 1 away from the center line of the length direction of the electrode, and the other end of the electrode 3 in the width direction does not exceed the side of the other flattening mechanism 1 away from the center line of the length direction of the electrode.

[0038] Specifically, it is necessary to first set the two flattening mechanisms facing each other, and make the flattening channels 2 in the two flattening mechanisms at the same height; then adjust the horizontality of each flattening mechanism 1 so that the extension direction of the main body 111 is horizontal; adjust the spacing between the two flattening mechanisms to ensure that when the pole piece 3 passes through the flattening channel 2, both ends of the pole piece 3 in the width direction can be in the flattening channel 2; initialize the pole piece non-contact electromagnetic flattening system, and input the thickness parameters of the pole piece 3 and the target flatness of the pole piece 3; the pole piece 3 will be wrinkled due to continuous external interference during the processing; pass the wrinkled pole piece 3 through the flattening channel 2, and make one end of the pole piece 3 in the width direction enter one of the flattening mechanisms, and the other end of the pole piece 3 in the width direction enter the other flattening mechanism; maintain a certain tension in the walking direction of the pole piece 3 to ensure that when the pole piece 3 passes through the flattening channel 2, the walking speed direction of the part of the pole piece 3 located in the flattening channel 2 remains horizontal; use the driving mechanism to pull the pole piece 3.

[0039] S02. The power control module supplies three-phase current to each flattening mechanism 1 respectively, and the directions of the three-phase currents supplied to the two flattening mechanisms 1 in the same flattening device are the same.

[0040] After the three-phase current is passed into the power control module, the driving mechanism pulls the pole piece 3 to transmit, the speed sensor detects the tape running speed of the pole piece 3, the tension sensor detects the tape running tension of the pole piece 3, the laser sensor detects the lateral offset of the pole piece 3 in the width direction, and the CCD camera photographs the pole piece 3 to detect the wrinkle profile of the pole piece 3.

[0041] S03. A three-phase current is passed through the coil 12 to generate a traveling wave magnetic field in the flattening channel 2. The traveling wave magnetic field induces eddy currents in the current collector of the pole piece 3. The eddy currents interact with the traveling wave magnetic field to generate an electromagnetic force facing away from the other flattening channel 2. The pole piece 3 is flattened in the width direction of the pole piece 3 under the action of the electromagnetic force. Among them, the detection system can send the detected wrinkle contour, surface morphology and surface image texture data of the pole piece 3 to the data processing system. The data processing system outputs a control quantity according to the detection result of the detection system and sends it to the power control module. The power control module adjusts the frequency and voltage of the three-phase alternating current according to the control quantity so that the opposite ends of the pole piece 3 in the width direction are subjected to electromagnetic force until the detection system detects that the wrinkles on the pole piece 3 are eliminated. The power control module controls the flattening device to stop applying electromagnetic force to the pole piece 3. Preferably, the detection system sends the detected data such as the pole piece 3 running speed, pole piece 3 running tension, pole piece 3 surface morphology and image texture, and the lateral offset of the pole piece 3 in the width direction to the data processing system; the data processing system uses a fuzzy control method to comprehensively calculate the wrinkle confidence of the pole piece 3 based on the data detected by the detection system; when the wrinkle confidence of the pole piece 3 exceeds the threshold, the data processing system uses an RBF-PID (radial basis function neural network combined with a PID controller) adaptive control method to calculate and output the control quantity, and the data processing system transmits the control quantity to the inverter, the inverter adjusts the V / f parameter, and the power control module dynamically adjusts the traveling wave magnetic field intensity in the flattening channel 2 according to the real-time adjusted V / f parameter, thereby adjusting the electromagnetic force on both ends of the pole piece 3, so that both ends of the pole piece 3 in the width direction are affected by the electromagnetic force, and the electromagnetic forces on the two ends of the pole piece 3 in the width direction are in opposite directions until the wrinkles on the pole piece 3 are dynamically eliminated; in this process, the data processing system records the data and uses a neural network for learning, and the flattening of the pole piece 3 is completed. When the wrinkle confidence of the pole piece 3 is lower than the threshold, the power control module inputs a three-phase current to the coil 12 according to the preset value, and the pole piece 3 in the flattening channel 2 is subjected to the conventional traveling wave magnetic field and maintains conventional tension under the action of the electromagnetic force, thereby avoiding wrinkling until the pole piece 3 is completely flattened.

[0042] In some embodiments, in step S03, the direction of the traveling wave magnetic field is made to form an acute angle with the running direction of the pole piece 3, and by adjusting the current frequency and / or the angle between the direction of the traveling wave magnetic field and the running direction of the pole piece 3, the component speed of the traveling wave magnetic field in the running direction of the pole piece 3 is made equal to the running speed of the pole piece 3.

[0043] Specifically, a motor is used to drive the flattening mechanism 1 to rotate, so that the end of the main body 111 away from the center line of the pole piece 3 is tilted toward the running direction of the pole piece 3, so that the direction of the traveling wave magnetic field generated by the flattening mechanism 1 forms an acute angle with the running direction of the pole piece 3, and an angle sensor is used to detect the angle between the center line of the pole piece 3 and the extension direction of the main body 111. The flattening mechanism 1 dynamically adjusts the relative angle between the center line of the pole piece 3 and the extension direction of the main body 111 based on the data detected by the angle sensor, so that the component speed of the traveling wave magnetic field in the running direction of the pole piece 3 is equal to the running speed of the pole piece 3, so as to eliminate the obstruction of the traveling wave magnetic field to the running of the pole piece 3, thereby only forming an electromagnetic force along the width direction of the pole piece 3.

[0044] It can be seen from this embodiment that the present application passes three-phase alternating current to multiple coils 12 through the power control module, so that a traveling wave magnetic field is generated in the flattening channel 2. When the pole piece 3 passes through the flattening channel 2, eddy currents are induced in the collector of the pole piece 3. The size of the traveling wave magnetic field is controlled by the power control module, and the pole piece 3 is flattened by electromagnetic force. The entire process does not contact the surface of the pole piece 3 and does not damage the slurry coating on the surface of the pole piece 3. It is suitable for the flattening of wet pole pieces 3, semi-dry pole pieces 3, and dry pole pieces 3, and the traveling wave magnetic field can be dynamically adjusted according to the degree of wrinkling of the pole piece 3. The size of the electromagnetic force acting on the pole piece 3 can be adjusted more smoothly, thereby improving the flattening accuracy of the pole piece 3 and thus improving the quality of the finished product of the pole piece 3.

[0045] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for this application. In addition, it is understood that the steps in the method of the embodiment of the present application can be adjusted in sequence, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0046] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A non-contact electromagnetic flattening system for pole pieces, characterized in that: include: An electromagnetic flattening module, the electromagnetic flattening module comprising two flattening devices, the two flattening devices being spaced apart along the width direction of the pole piece; the flattening device comprising at least two flattening mechanisms, the at least two flattening mechanisms being spaced apart from each other, forming a flattening channel for passing the pole piece between the at least two flattening mechanisms; the flattening mechanism comprising an iron core and a plurality of coils, the plurality of coils being wound around the iron core in a three-phase winding structure; A power supply control module, wherein the power supply control module supplies three-phase alternating current to the plurality of coils so that the flattening channel generates a traveling wave magnetic field; the power supply control module supplies currents to the two flattening devices in opposite directions; the power supply control module adjusts the frequency and voltage of the three-phase alternating current, thereby adjusting the intensity of the traveling wave magnetic field received by the pole pieces in the flattening channel.

2. The pole piece non-contact electromagnetic flattening system according to claim 1, characterized in that: It also includes a detection system and a data processing system. The detection system is used to detect the tape-walking status of the pole piece and send the detection result to the data processing system. The data processing system outputs the control quantity according to the detection result of the detection system and sends the control quantity to the power control module. The power control module adjusts the frequency and voltage of the three-phase alternating current according to the control quantity.

3. The pole piece non-contact electromagnetic flattening system according to claim 1, characterized in that: The iron core includes a main body and a plurality of iron teeth. The main body is in a long strip shape. The iron teeth are connected to the main body. The plurality of iron teeth are spaced apart along the length direction of the main body. The plurality of coils are wound outside the iron teeth in a three-phase winding structure.

4. The pole piece non-contact electromagnetic flattening system according to claim 3, characterized in that: The main body is provided with a plurality of cooling grooves, and the cooling grooves are located on a side of the main body facing away from the iron teeth; the electromagnetic flattening module further comprises a cooling mechanism, and the cooling mechanism comprises a cooling pipe, and the cooling pipe passes through the cooling grooves and conducts heat with the main body.

5. The pole piece non-contact electromagnetic flattening system according to claim 3, characterized in that: The flattening mechanism includes at least two iron cores and magnetic conductive parts, at least two of the iron cores are arranged side by side along the length direction of the main body, and two adjacent iron cores are connected by magnetic conductive parts. The power control module includes multiple three-phase power supplies, and the three-phase power supplies correspond one-to-one to the main body. The coil on each iron core is powered by one of the three-phase power supplies.

6. The pole piece non-contact electromagnetic flattening system according to claim 1 or 3, characterized in that: The plurality of coils are wound outside the core in a structure of single-wire double-layer short-pitch winding, single-wire single-layer short-pitch winding, single-wire double-layer full-pitch winding, double-wire single-layer full-pitch winding, double-wire double-layer full-pitch winding or double-wire double-layer short-pitch winding.

7. The pole piece non-contact electromagnetic flattening system according to claim 3, characterized in that: One end of the main body away from the center line of the pole piece is inclined toward the tape running direction of the pole piece.

8. The pole piece non-contact electromagnetic flattening system according to claim 3, characterized in that: The flattening mechanism further includes an electromagnetic shielding shell, which covers the opposite ends of the iron core and an area of the iron core where the coil is wound outside one side of the iron teeth.

9. A pole piece flattening method using the pole piece non-contact electromagnetic flattening system according to any one of claims 1 to 8, characterized in that: The following steps are involved: Make the electrode piece pass through the flattening channel, and make one end of the electrode piece in the width direction enter one of the flattening devices, and the other end of the electrode piece in the width direction enter the other flattening device; The power control module supplies three-phase current to each flattening mechanism respectively, and the three-phase currents supplied to the two flattening mechanisms in the same flattening device have the same direction; A three-phase current is passed through the coil to generate a traveling wave magnetic field in the flattened channel. The traveling wave magnetic field induces eddy currents in the collector of the pole piece. The eddy currents interact with the traveling wave magnetic field to generate an electromagnetic force facing away from the other flattened channel. The pole piece is flattened in the width direction of the pole piece under the action of electromagnetic force.

10. The pole piece flattening method according to claim 9, characterized in that: The direction of the traveling wave magnetic field is made to form an acute angle with the pole piece's tape running direction. By adjusting the current frequency and / or the angle between the direction of the traveling wave magnetic field and the pole piece's tape running direction, the component velocity of the traveling wave magnetic field in the pole piece's tape running direction is made equal to the pole piece's tape running speed.

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