Core shaping method and winding apparatus

Abstract

The application discloses a winding core shaping method and a winding equipment. The winding core shaping method comprises the following steps: adjusting the angle of a pressing plate to a shaping angle so that the pressing plate is inclined in a direction perpendicular to the surface of the winding core, the inclined direction of the pressing plate is the tab misalignment direction of the winding core, and then driving the pressing plate to press on the winding core until the pressing plate is parallel to the surface of the winding core, wherein the size of the shaping angle is calculated according to the tab misalignment amount of the winding core and the single-side thickness of the winding core. The winding core shaping method can reduce the tab misalignment amount of the winding core when the winding core is mechanically shaped by the pressing plate with the adjusted angle, so that the tab misalignment amount of the winding core meets the specification requirements, and the yield of the winding core is improved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a core shaping method and winding equipment. Background Technology

[0002] Currently, all power / energy storage wound battery cells are multi-tab structures. During the production process, the alignment of the tabs is required to avoid affecting subsequent welding and wrapping. However, during the production process, due to factors such as uneven thickness of the anode, cathode, and insulating material, the tabs are prone to misalignment beyond the specifications, resulting in the scrapping of the wound core and affecting the yield. Summary of the Invention

[0003] The present invention provides a core shaping method and a winding device to solve at least one of the above-mentioned technical problems.

[0004] One embodiment of the present invention provides a core shaping method comprising: The angle of the pressure plate is adjusted to a shaping angle so that the pressure plate is tilted in a direction perpendicular to the surface of the core. The tilting direction of the pressure plate is the direction of the tab misalignment of the core. Then, the pressure plate is driven to press on the core until the pressure plate is parallel to the surface of the core. The size of the shaping angle is calculated from the tab misalignment of the core and the single-sided thickness of the core.

[0005] The above-mentioned core shaping method adjusts the angle of the pressure plate to the shaping angle, thereby reducing the amount of tab misalignment of the core when mechanically shaping the core using the pressure plate after angle adjustment, so that the amount of tab misalignment of the core meets the specification requirements and improves the core yield.

[0006] In some embodiments, the core shaping method includes: detecting the angle of the tabs of the core, and calculating the tab misalignment of the core based on the angle of the tabs.

[0007] In this way, the amount of electrode misalignment of the core can be calculated by the angle at which the electrode is located.

[0008] In some embodiments, the angle at which the electrode tabs are located includes the angle at which the first electrode tab is located and the angle at which the last electrode tab is located, and the core shaping method includes: Calculate the misalignment of the first electrode ear based on the angle at which the first electrode ear is located; Calculate the tail electrode misalignment based on the angle at which the tail electrode ear is located; The electrode misalignment of the core is calculated based on the misalignment of the first electrode and the misalignment of the last electrode.

[0009] In this way, the amount of tab misalignment of the core can be calculated.

[0010] In some embodiments, the misalignment of the tabs of the core is L, the misalignment of the first tab is D1, the misalignment of the last tab is D2, and L = D2 - D1.

[0011] Thus, the method for calculating the misalignment of the core tabs is simple and efficient.

[0012] In some embodiments, the misalignment of the first electrode lug is determined by the following formula: D1=π×d1×α / 360, where D1 represents the distance between the first electrode lug and the center line of the core before the core is pressed, D1 is the misalignment of the first electrode lug, d1 represents the core diameter corresponding to the first electrode lug when it is fed into the core, and α represents the angle of the first electrode lug. The misalignment of the tail tab is determined by the following formula: D2=π×d2×(α-β) / 360, where D2 represents the distance between the tail tab and the center line of the core before the core is pressed, D2 is the misalignment of the tail tab, d2 represents the core diameter corresponding to the tail tab when it is fed in, and β represents the angle of the tail tab.

[0013] Thus, the misalignment of the first and last electrodes can be calculated using the above formulas.

[0014] In some embodiments, the size of the shaping angle is determined by the following formula: γ=arctan(h / L), where γ represents the shaping angle, h represents the single-sided thickness of the core, and L represents the tab misalignment of the core.

[0015] In this way, the size of the shaping angle can be calculated.

[0016] In some embodiments, the pressure plate is connected to a motor, and the core shaping method includes: The magnitude of the shaping angle is converted into the required number of pulse signals, and the pulse signals are used to control the operation of the motor to adjust the angle of the pressure plate to the shaping angle.

[0017] In this way, a pulse signal can be used to drive the motor, so that the angle of the pressure plate can be adjusted to the shaping angle.

[0018] A winding device according to an embodiment of the present invention includes: An angle adjustment assembly, the angle adjustment assembly having a connecting shaft; A pressure plate, connected to the connecting shaft, is used for mechanically shaping the core. The angle adjustment assembly is used to drive the connecting shaft to rotate and adjust the angle of the pressure plate to a shaping angle so that the pressure plate tilts in a direction perpendicular to the surface of the core. The tilting direction of the pressure plate is the direction of the tab misalignment of the core. The magnitude of the shaping angle is calculated from the tab misalignment amount of the core and the single-sided thickness of the core. A displacement adjustment assembly is connected to the pressure plate. The displacement adjustment assembly is used to drive the pressure plate to press on the core until the pressure plate is parallel to the surface of the core after the angle of the pressure plate is adjusted to the shaping angle.

[0019] In the aforementioned winding equipment, the angle adjustment component is used to drive the connecting shaft to rotate and adjust the angle of the pressure plate to the shaping angle. In turn, when the displacement adjustment component uses the pressure plate after the angle adjustment to mechanically shape the core, it can reduce the amount of tab misalignment of the core, so that the amount of tab misalignment of the core meets the specification requirements and improves the core yield.

[0020] In some embodiments, the displacement adjustment assembly includes a cylinder, the cylinder includes a control rod, the control rod is connected to the angle adjustment assembly, and the displacement adjustment assembly is used to drive the angle adjustment assembly by the cylinder to drive the pressure plate to press on the core until the pressure plate is parallel to the surface of the core after the angle of the pressure plate is adjusted to the shaping angle.

[0021] In this way, the pressure plate can be driven by a cylinder to press onto the core, and the movement method is simple.

[0022] In some embodiments, the winding device includes a control module electrically connected to the angle adjustment component. The control module has an operation page for displaying the operating status of the winding device, including the current angle of the pressure plate.

[0023] In this way, operators can learn about the operating status of the winding equipment through the operation page, improving the user experience.

[0024] In some embodiments, the winding device includes a detection module electrically connected to the angle adjustment assembly. The detection module is used to detect the angle of the tabs of the core and calculate the tab misalignment of the core based on the angle of the tabs.

[0025] In this way, the amount of electrode misalignment of the core can be calculated by the angle at which the electrode is located.

[0026] In some embodiments, the angle of the tabs includes the angle of the first tab and the angle of the last tab. The detection module is used to calculate the first tab misalignment based on the angle of the first tab, calculate the last tab misalignment based on the angle of the last tab, and calculate the tab misalignment of the core based on the first tab misalignment and the last tab misalignment.

[0027] In this way, the amount of tab misalignment of the core can be calculated.

[0028] In some embodiments, the misalignment of the tabs of the core is L, the misalignment of the first tab is D1, the misalignment of the last tab is D2, and L = D2 - D1.

[0029] Thus, the method for calculating the misalignment of the core tabs is simple and efficient.

[0030] In some embodiments, the misalignment of the first electrode lug is determined by the following formula: D1=π×d1×α / 360, where D1 represents the distance between the first electrode lug and the center line of the core before the core is pressed, D1 is the misalignment of the first electrode lug, d1 represents the core diameter corresponding to the first electrode lug when it is fed into the core, and α represents the angle of the first electrode lug. The misalignment of the tail tab is determined by the following formula: D2=π×d2×(α-β) / 360, where D2 represents the distance between the tail tab and the center line of the core before the core is pressed, D2 is the misalignment of the tail tab, d2 represents the core diameter corresponding to the tail tab when it is fed in, and β represents the angle of the tail tab.

[0031] Thus, the misalignment of the first and last electrodes can be calculated using the above formulas.

[0032] In some embodiments, the size of the shaping angle is determined by the following formula: γ=arctan(h / L), where γ represents the shaping angle, h represents the single-sided thickness of the core, and L represents the tab misalignment of the core.

[0033] In this way, the size of the shaping angle can be calculated.

[0034] In some embodiments, the winding device includes a control module, the angle adjustment assembly includes a motor and a connecting block, the connecting shaft is rotatably connected to the motor, the connecting block is fixedly connected to the connecting shaft and the pressure plate, the control module is electrically connected to the motor, and the control module is used to convert the size of the shaping angle into a required number of pulse signals, and use the pulse signals to control the operation of the motor to adjust the angle of the pressure plate to the shaping angle.

[0035] In this way, a pulse signal can be used to drive the motor, so that the angle of the pressure plate can be adjusted to the shaping angle.

[0036] Additional aspects and advantages of the invention 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 the invention. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0038] Figure 1 This is a block diagram of a winding device according to an embodiment of the present invention; Figures 2 to 3 This is a connection diagram of the angle adjustment component and the pressure plate according to an embodiment of the present invention; Figure 4 This is a structural diagram of the unshaped core according to an embodiment of the present invention; Figure 5 This is a structural diagram of the core shaping according to an embodiment of the present invention; Figure 6 This is a connection diagram of the cylinder and the angle adjustment assembly according to an embodiment of the present invention; Figure 7 This is a schematic diagram illustrating the calculation principle of the first electrode ear misalignment and the tail electrode ear misalignment in an embodiment of the present invention. Figure 8 This is a model diagram of the electrode misalignment and pressure plate shaping angle according to an embodiment of the present invention; Figure 9 This is a schematic diagram illustrating the process of mechanically shaping the core using a pressure plate according to an embodiment of the present invention.

[0039] Figures 10 to 11 This is a flowchart of the core shaping method according to an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures: Winding equipment 100, core 200, angle adjustment assembly 12, connecting shaft 14, pressure plate 16, pole lug 18, pressing plane 20, displacement adjustment assembly 22, cylinder 24, control rod 26, fixing rod 28, motor 30, connecting block 32, control module 34, detection module 36. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. 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, and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0046] Currently, to address the issue of electrode misalignment, on-site personnel are primarily using the following measures to improve and adjust the situation: a. Adjusting the circumference of the winding needle: By attaching Teflon of different thicknesses to the winding surface, the diameter of the winding needle can be changed, thus altering the misalignment of the electrode tabs. This method requires machine downtime for attachment, impacting production efficiency. Furthermore, due to the influence of the Teflon attachment thickness, width, and length, success cannot be guaranteed on the first attempt, and there is a possibility of scrapping during the debugging process. Additionally, if the attached Teflon is not replaced for an extended period, it will cause scratches on the inner ring of the core, posing a safety hazard. b. Change materials by using electrode sheets of different thicknesses in combination to reduce the impact of thickness. However, this solution requires material replacement after a problem is discovered, which is cumbersome, results in high scrap rates during material changeovers, impacts efficiency and yield, and cannot guarantee the improvement effect. c. Adjusting the pattern roller pressure creates embossing of varying heights on the negative electrode surface, adjusting the gap between electrodes to compensate for thickness differences and correct tab misalignment. However, the height of the raised areas created by the pattern pressure is limited; improper pressure may damage the electrode, posing a safety hazard. Furthermore, unstable pattern pressure carries a risk of failure.

[0047] Besides their own shortcomings, the above three solutions can only be adjusted after problems are discovered. They have no effective remedial measures for already produced cores, resulting in product scrap and affecting yield.

[0048] In view of this, the present invention designs an automatically rotating pressure plate. Before the core is shaped (before the pressure plate is pressed down), the angle of the pressure plate is automatically calculated and adjusted based on the amount of tab misalignment obtained during the winding process. By pressing down the core at different pressure plate angles, the core is shaped, thereby achieving the purpose of adjusting the tab misalignment problem.

[0049] Please refer to Figures 1 to 3An embodiment of the present invention provides a winding device 100 including an angle adjustment assembly 12, a pressure plate 16, and a displacement adjustment assembly 22. The angle adjustment assembly 12 has a connecting shaft 14. The pressure plate 16 is connected to the connecting shaft 14 and is used to mechanically shape the core 200. The angle adjustment assembly 12 drives the connecting shaft 14 to rotate and adjust the angle of the pressure plate 16 to the shaping angle, causing the pressure plate 16 to tilt in a direction perpendicular to the surface of the core 200. The tilting direction of the pressure plate 16 is the direction of the tab misalignment of the core 200. The magnitude of the shaping angle is calculated from the tab misalignment amount of the core 200 and the single-sided thickness of the core 200. The displacement adjustment assembly 22 is connected to the pressure plate 16 and, after the angle of the pressure plate 16 is adjusted to the shaping angle, drives the pressure plate 16 to press onto the core 200 until the pressure plate 16 is parallel to the surface of the core 200.

[0050] In the aforementioned winding equipment 100, the angle adjustment component 12 is used to drive the connecting shaft 14 to rotate to adjust the angle of the pressure plate 16 to the shaping angle. In turn, when the displacement adjustment component 22 uses the pressure plate 16 after angle adjustment to mechanically shape the core 200, it can reduce the amount of tab misalignment of the core 200, so that the amount of tab misalignment of the core 200 meets the specification requirements and improves the yield of the core 200.

[0051] Specifically, the core 200 is formed by winding battery cells. The core 200 includes multiple tabs 18. The battery cell is composed of alternating layers of positive electrode plates, separators, and negative electrode plates. One side of the positive electrode plate has multiple positive tabs, and one side of the negative electrode plate has multiple negative tabs. Before winding, the battery cells are laid flat. The winding equipment 100 includes a winding needle. During the winding process, one side of the battery cell can be fixed to the winding needle. The winding needle rotates, thereby winding the flat battery cells into the core 200. When the core 200 is unloaded (at this time, the core 200 is not yet shaped), the core 200 is roughly racetrack-shaped, such as... Figure 4 As shown, at this time, the tab 18 is misaligned to the left. After the core 200 is cut, it is pressed and shaped by the pressure plate 16, as shown. Figure 5 As shown, at this point, the electrode tab misalignment amount = width D - electrode tab width d, where width D can be the maximum distance between the first electrode tab 18 and the last electrode tab 18 along a direction perpendicular to the thickness of the core 200. After the core 200 is shaped, the core 200 roughly takes on a flatter racetrack shape, as shown. Figure 5 As shown. The side of the battery cell with tabs 18 is perpendicular to the side of the battery cell fixed on the winding needle. The thickness of one side of the winding core 200 can be the thickness of the winding core 200 on one side of the track. To reduce the amount of tab misalignment of the winding core 200, the winding core 200 is mechanically shaped by controlling different angles of the pressure plates 16 before the winding core 200 is shaped. Figure 2 and Figure 3 In the middle, the angle adjustment component 12 can drive the pressure plate 16 to rotate left and right to adjust the angle.

[0052] During the winding process, the tab misalignment of the core 200 is mainly affected by the thickness of the electrode sheet. When the electrode sheet thickness deviates from the normal design value, the tabs 18 will misalign in an increasing manner. More specifically, assuming the electrode sheet thickness increases by ΔH, then when winding one turn, the tab misalignment L1 = 0; when winding two turns, the tab misalignment L2 = L1 + π / 2 × ΔH; when winding three turns, the tab misalignment L3 = L2 + π / 2 × 2ΔH, and so on. Therefore, when winding n turns, the tab misalignment Ln = L(n-1) × π / 2 × ΔH. Thus, the tab misalignment of the core 200 is related to the first tab misalignment and the last tab misalignment.

[0053] The angle adjustment component 12 can adjust the angle of the pressure plate 16 to the shaping angle, and then the pressure plate 16 presses on the core 200 to automatically adjust the misaligned core 200.

[0054] The pressure plate 16 has a pressing surface 20, which is used to press against one side of the core 200. The present invention does not specifically limit the shape and material of the pressure plate 16. Figure 2 In the middle, the pressure plate 16 is rectangular, and the pressing surface 20 is the side with the largest area of ​​the rectangular prism. The pressure plate 16 can be made of plastic to avoid scratching the core 200.

[0055] In one embodiment, the shaping angle can be the angle of the pressing plane 20 of the pressure plate 16 relative to the horizontal plane. Depending on the size of the shaping angle, the angle adjustment assembly 12 can adjust the angle of the pressure plate 16 to the size of the shaping angle, so that the pressing plane 20 of the pressure plate 16 is tilted relative to the pressed plane or horizontal plane of the core 200 by the shaping angle.

[0056] The direction of the tab misalignment of the core 200 can be obtained by analyzing the image of the core 200 captured by the camera, or by manual input, and is not specifically limited here.

[0057] The pressure plate 16 is inclined in a direction perpendicular to the surface of the core 200. The inclination direction of the pressure plate 16 is the direction of the tab misalignment of the core 200. Thus, when the displacement adjustment assembly 22 drives the pressure plate 16 to press down on the core 200, the portion of the pressure plate 16 that first contacts the core 200 can provide a force to the core 200 in the opposite direction to the tab misalignment, driving the tab 18 near the pressure plate 16 to move in the opposite direction to the misalignment, thereby reducing the amount of tab misalignment. Figure 4In the middle, the electrode tab is misaligned to the left, and the pressure plate 16 is tilted to the left in a direction perpendicular to the surface of the core 200. According to the tilt direction of the pressure plate 16, the angle adjustment assembly 12 can adjust the angle of the pressure plate 16 so that the angle-adjusted pressure plate 16 is tilted to the left in a direction perpendicular to the surface of the core 200, and thus the angle-adjusted pressing plane 20 is tilted to the left in a direction perpendicular to the pressed plane of the core 200.

[0058] For example, initially, both the pressed surface of the core 200 and the pressing surface 20 of the pressure plate 16 are horizontal. The shaping angle, calculated from the offset of the tabs of the core 200 and the thickness of one side of the core 200, is 20 degrees. The angle adjustment assembly 12 adjusts the pressing surface 20 to a position tilted 20 degrees relative to the pressed surface of the core 200. Since the tab offset of the core 200 is to the left, the pressure plate 16 tilts to the left in a direction perpendicular to the pressed surface of the core 200. The angle adjustment assembly 12 drives the pressure plate 16 to rotate, causing the angle-adjusted pressing surface 20 to tilt to the left in a direction perpendicular to the pressed surface of the core 200.

[0059] During the winding process, the displacement adjustment assembly 22 can drive the pressure plate 16 away from the core 200. After one core is wound, the angle adjustment assembly 12 adjusts the angle of the pressure plate 16 to the shaping angle, and then the displacement adjustment assembly 22 can drive the pressure plate 16 to press onto the core 200. In one embodiment, the displacement adjustment assembly 22 can drive the pressure plate 16 to move upward away from the core 200, and drive the pressure plate 16 to move downward to press the core 200 until the pressure plate 16 is parallel to the surface of the core 200.

[0060] When the pressure plate 16 is parallel to the surface of the core 200, the displacement adjustment component 22 can complete the pressure application of the pressure plate 16 on the core 200, and the shaping of the core 200 by the pressure plate 16 is completed. At this time, the misalignment of the tabs of the core 200 meets the specifications.

[0061] In some implementations, please refer to Figure 1 and Figure 6 The displacement adjustment component 22 includes a cylinder 24, which includes a control rod 26. The control rod 26 is connected to the angle adjustment component 12. The displacement adjustment component 22 is used to drive the angle adjustment component 12 to press the pressure plate 16 onto the core 200 after the angle of the pressure plate 16 is adjusted to the shaping angle, until the pressure plate 16 is parallel to the surface of the core 200.

[0062] In this way, the cylinder 24 can be used to drive the pressure plate 16 to press onto the core 200, and the movement method is simple.

[0063] Specifically, the cylinder 24 also includes a fixed rod 28, and a control rod 26 is telescopically connected to the fixed rod 28. The control rod 26 can extend and retract relative to the fixed rod 28 to adjust the length of the control rod 26 outside the fixed rod 28, thereby driving the angle adjustment assembly 12 and the pressure plate 16 to move linearly. The movement method is simple and efficient.

[0064] After the angle of the pressure plate 16 is adjusted to the shaping angle, the displacement adjustment assembly 22 can use the cylinder 24 to drive the angle adjustment assembly 12 to move the pressure plate 16 onto the core 200. In one embodiment, the angle adjustment assembly 12 includes a motor 30 and a connecting block 32. The connecting shaft 14 is rotatably connected to the motor 30, and the connecting block 32 is fixedly connected to the connecting shaft 14 and the pressure plate 16. The control lever 26 can be fixedly connected to the motor 30 to move the pressure plate 16 onto or away from the core 200.

[0065] It is understood that in other embodiments, the control lever 26 of the cylinder 24 may also be directly connected to the pressure plate 16 or the connecting block 32.

[0066] Please refer to Figure 9 Before the pressure plate 16 presses down, the angle of the pressure plate 16 is adjusted to the shaping angle γ, and the right side of the pressure plate 16 is lower. The pressure plate 16 presses down on the core 200 at the pressing angle of the shaping angle γ. The right side of the pressure plate 16 presses down on the core 200 first. During the pressing process, the angle of the pressure plate 16 gradually decreases. The right side of the pressure plate 16 applies a rightward pushing force to the core 200, causing the left-misaligned pole tab 18 to move to the right. The amount of pole tab misalignment decreases until the pressure plate 16 is parallel to the surface of the core 200. At this time, the entire pressure plate 16 presses down on the core 200, and the amount of pole tab misalignment is minimized.

[0067] In some embodiments, the winding device 100 includes a control module 34, which is electrically connected to the angle adjustment component 12. The control module 34 is provided with an operation page for displaying the operating status of the winding device 100, including the current angle of the pressure plate 16.

[0068] In this way, operators can learn about the operating status of the winding device 100 through the operation page, thus improving the user experience.

[0069] Specifically, the control module 34 may include a controller, a display screen, and input components. The controller is electrically connected to the display screen and input components. The display screen can show the operation page, which, in addition to the current angle of the pressure plate 16, can also display parameters such as the angle of the tab 18 and the single-sided thickness of the core 200, indicating the operating status of the winding equipment 100. During the winding process, the operation page can display the current angle of the pressure plate 16 and the difference between the current angle of the pressure plate 16 and the shaping angle in real time, allowing operators to obtain the real-time operating status of the winding equipment 100 through the operation page, thus improving the user experience.

[0070] Input components may include, but are not limited to, a mouse, keyboard, microphone, etc. Operators can input parameter settings and start / stop signals for related functions of the winding equipment 100 through the input components. The controller can control the automatic operation of the winding equipment 100 according to the parameters and start / stop signals of the winding equipment 100.

[0071] The operation settings of the pressure plate 16 can be controlled through the operation page. The angle of the pressure plate 16 can be automatically adjusted in a closed loop, or the shaping angle and related compensation values ​​can be manually set.

[0072] In some implementations, please refer to Figure 1 The winding equipment 100 includes a detection module 36, which is electrically connected to the angle adjustment component 12. The detection module 36 is used to detect the angle of the tab 18 of the core 200 and calculate the tab misalignment of the core 200 based on the angle of the tab 18.

[0073] Thus, the misalignment of the core 200 can be calculated by the angle at which the tab 18 is located.

[0074] Specifically, the detection module 36 includes a tab detection sensor and an angle sensor. The tab detection sensor is located at the winding feed position. When the tab 18 passes the tab detection sensor, the tab detection sensor can output a level signal (high level signal or low level signal). The detection module 36 can acquire the above level signal to determine that a tab 18 has been detected. In one embodiment, the tab detection sensor may include a through-beam sensor, which includes a light emitter and a light receiver. The light emitter and the light receiver are arranged facing each other on a path perpendicular to the movement path of the tab 18. When there is no tab 18 blocking the light emitter and the light receiver, the light receiver can receive the detection light emitted by the light emitter, and the light receiver outputs a high level signal. When the tab 18 passes through the gap between the light emitter and the light receiver, the detection light is blocked by the tab 18, the light receiver cannot receive the detection light, the light receiver outputs a low level signal, and the detection module 36 receives the low level signal to determine that a tab 18 has been detected. Optionally, the detection light can be infrared light.

[0075] In one embodiment, the electrode detection sensor may include a light emitter and a light receiver, which are arranged on the same side perpendicular to the movement path of the electrode 18. When no electrode 18 passes by, the detection light emitted by the light emitter is emitted directly, and the light receiver cannot receive the detection light, so the light receiver outputs a low-level signal. When the electrode 18 crosses the optical path of the detection light, the electrode 18 reflects the detection light to the light receiver, which receives the reflected detection light and outputs a high-level signal. The detection module 36 receives the high-level signal and determines that an electrode 18 has been detected.

[0076] An angle sensor is used to detect the needle angle. When tab 18 is detected, the detection module 36 can record the needle angle position where tab 18 is located, as the angle of tab 18. The needle angle position is 0° with the origin of the needle as the reference point. The angle of tab 18 can be determined according to the rotation angle of the needle. The degree by which the needle rotates determines the size of the needle angle position.

[0077] After obtaining the angle of the tab 18, the detection module 36 can calculate the tab misalignment of the core 200.

[0078] In some implementations, the angle at which the tab 18 is located includes the angle at which the first tab 18 is located and the angle at which the last tab 18 is located. The detection module 36 is used to calculate the first tab misalignment based on the angle at which the first tab 18 is located, calculate the last tab misalignment based on the angle at which the last tab 18 is located, and calculate the tab misalignment of the core 200 based on the first tab misalignment and the last tab misalignment.

[0079] In this way, the amount of tab misalignment of core 200 can be calculated.

[0080] Specifically, during the winding process, the amount of electrode tab misalignment of the core 200 is mainly affected by the electrode thickness. When the electrode thickness deviates from the normal design value, the electrode tab 18 will be misaligned in an increasing manner. Therefore, the amount of electrode tab misalignment of the core 200 is related to the amount of misalignment of the first electrode tab and the amount of misalignment of the last electrode tab.

[0081] The detection module 36 can calculate the misalignment of the first electrode ear based on the angle of the first electrode ear 18, and calculate the misalignment of the tail electrode ear based on the angle of the tail electrode ear 18. Then, the electrode ear misalignment of the core 200 can be calculated based on the misalignment of the first electrode ear and the misalignment of the tail electrode ear.

[0082] In one embodiment, the winding device 100 has a cutting position, where the winding device 100 can cut the battery cell. The cut core 200 can be assembled as the core 200 of a battery cell, and then the unwound battery cells can be wound further. The first tab 18 of the core 200 is the first tab 18 identified after passing through the cutting position during the winding of the battery cell. The last tab 18 of the core 200 is the first tab 18 in the winding direction among two adjacent tabs 18 when the distance between two adjacent tabs 18 is greater than a preset value. Specifically, the distance between the last tab 18 and the first tab 18 of the next electrode sheet is the maximum value of the entire tab 18 distance. Assuming the design value is L, and the preset value T = L-5mm~L-10mm, when the distance S > T between two adjacent tabs 18, the first tab 18 in the winding direction among two adjacent tabs 18 is the last tab 18.

[0083] When the first tab 18 passes the tab detection sensor, the detection module 36 records the winding needle angle position of the first tab 18 as the angle of the first tab 18. When the last tab 18 passes the tab detection sensor, the detection module 36 records the winding needle angle position of the last tab 18 as the angle of the last tab 18.

[0084] In some implementations, the disc misalignment of the core is L, the first disc misalignment is D1, and the last disc misalignment is D2, where L = D2 - D1. This method simplifies and improves the efficiency of calculating the disc misalignment of the core.

[0085] Specifically, during the winding process, the amount of electrode tab misalignment of the core 200 is mainly affected by the electrode thickness. When the electrode thickness deviates from the normal design value, the electrode tab 18 will be misaligned in an increasing manner. Therefore, the amount of electrode tab misalignment of the core 200 is related to the amount of misalignment of the first electrode tab and the amount of misalignment of the last electrode tab.

[0086] The offset of the core tabs is L = offset of the tail tab D2 - offset of the head tab D1. The calculation method for the offset of the core tabs is simple and efficient.

[0087] In some implementations, please refer to Figure 7 The misalignment of the first electrode ear is determined by the following formula: D1=π×d1×α / 360, where D1 represents the distance between the first electrode ear 18 and the center line of the core 200 before the core 200 is pressed, D1 is the misalignment of the first electrode ear, d1 represents the diameter of the core 200 when the first electrode ear 18 is fed in, and α represents the angle at which the first electrode ear 18 is located. The tail tab misalignment is determined by the following formula: D2=π×d2×(α-β) / 360, where D2 represents the distance between the tail tab 18 and the center line of the core 200 before the core 200 is pressed, D2 is the tail tab misalignment, d2 represents the diameter of the core 200 when the tail tab 18 is fed in, and β represents the angle of the tail tab 18.

[0088] Thus, the misalignment of the first and last electrodes can be calculated using the above formulas.

[0089] Specifically, by installing a distance sensor at the winding needle position, the diameter of the core 200 can be measured in real time during the winding process. When the first tab 18 is fed in, the diameter of the core 200 is measured as d1; when the last tab 18 is wound, the diameter of the core 200 is measured as d2. Taking the core 200 as a reference, the distance between the first tab 18 and the center line of the core 200 is D1 = π × d1 × α / 360, the distance between the last tab 18 and the center line of the core 200 is D2 = π × d2 × (α - β) / 360, and the tab misalignment amount L = D2 - D1 = π × d2 × (α - β) / 360 - π × d1 × α / 360. The detection module 36 can calculate the tab misalignment amount of the core 200 according to the above formula.

[0090] In some implementations, the size of the shaping angle is determined by the following formula: γ=arctan(h / L), where γ represents the shaping angle, h represents the single-sided thickness of the core 200, and L represents the amount of tab misalignment of the core 200.

[0091] In this way, the size of the shaping angle can be calculated.

[0092] Specifically, the model of the electrode misalignment and the shaping angle of the pressure plate 16 is as follows: Figure 8 As shown, during winding, the control module 34 calculates the width D = tab width d + tab misalignment L. Let the misalignment angle be γ, then tanγ = h / (Dd) = h / L, and therefore γ = arctan(h / L). The angle adjustment component 12 can automatically adjust the angle of the pressure plate 16 to the shaping angle. When the pressure plate 16 presses on the core 200, it achieves the purpose of automatically adjusting the tab misalignment of the core 200.

[0093] In some embodiments, the winding device 100 includes a control module 34, the angle adjustment assembly 12 includes a motor 30 and a connecting block 32, the connecting shaft 14 is rotatably connected to the motor 30, the connecting block 32 is fixedly connected to the connecting shaft 14 and the pressure plate 16, the control module 34 is electrically connected to the motor 30, and the control module 34 is used to convert the size of the shaping angle into the required number of pulse signals, and use the pulse signals to control the motor 30 to run in order to adjust the angle of the pressure plate 16 to the shaping angle.

[0094] In this way, the motor 30 can be driven by a pulse signal to adjust the angle of the pressure plate 16 to the shaping angle.

[0095] Specifically, the control module 34 can pre-store the correspondence between the size of the angle and the number of pulse signals. When the control module 34 calculates the size of the shaping angle, it can determine the required number of pulse signals based on the above correspondence. The motor 30 may include a motor driver and a motor winding. The control module 34 sends pulse signals to the motor driver, which converts the pulse signals into control signals. The control signals are transmitted to the motor windings, thereby driving the rotor of the motor 30 to rotate, so as to adjust the angle of the pressure plate 16 to the shaping angle. After that, the control module 34 can control the displacement adjustment component 22 to drive the pressure plate 16 to press on the core 200, so as to mechanically shape the core 200 and reduce the amount of pole tab misalignment of the core 200.

[0096] Please refer to Figure 10 An embodiment of the present invention provides a core shaping method comprising: Step 101: Adjust the angle of the pressure plate 16 to the shaping angle so that the pressure plate is tilted in a direction perpendicular to the surface of the core. The tilting direction of the pressure plate is the direction of the misalignment of the core's tabs. Step 103: Drive the pressure plate 16 to press on the core 200 until the pressure plate 16 is parallel to the surface of the core 200. The size of the shaping angle is calculated from the offset of the tabs of the core 200 and the single-sided thickness of the core 200.

[0097] The above-mentioned core shaping method adjusts the angle of the pressure plate 16 to the shaping angle. When the core 200 is mechanically shaped using the pressure plate 16 after the angle adjustment, the amount of tab misalignment of the core 200 can be reduced, so that the amount of tab misalignment of the core 200 meets the specification requirements and the yield of the core 200 is improved.

[0098] It should be noted that the above explanation of the implementation method and beneficial effects of the winding equipment 100 also applies to the core shaping method of this embodiment. To avoid redundancy, it will not be elaborated in detail here.

[0099] In some embodiments, the core shaping method includes: detecting the angle at which the tab 18 of the core 200 is located, and calculating the tab misalignment amount of the core 200 based on the angle at which the tab 18 is located.

[0100] Thus, the misalignment of the core 200 can be calculated by the angle at which the tab 18 is located.

[0101] In some embodiments, the angle at which the electrode tab 18 is located includes the angle at which the head electrode tab 18 is located and the angle at which the tail electrode tab 18 is located. Please refer to [reference needed]. Figure 11 Core shaping methods include: Step 201: Calculate the misalignment of the first pole ear based on the angle at which the first pole ear 18 is located; Step 203: Calculate the misalignment of the tail electrode ear based on the angle at which the tail electrode ear 18 is located; Step 205: Calculate the electrode misalignment of core 200 based on the first electrode misalignment and the last electrode misalignment.

[0102] In this way, the amount of tab misalignment of core 200 can be calculated.

[0103] In some embodiments, the pressure plate 16 is connected to a motor 30, and the core shaping method includes: The shaping angle is converted into the required number of pulse signals, and the pulse signals are used to control the motor 30 to adjust the angle of the pressure plate 16 to the shaping angle.

[0104] In this way, the motor 30 can be driven by a pulse signal to adjust the angle of the pressure plate 16 to the shaping angle.

[0105] In summary, this invention designs an automatically rotating pressure plate 16. Before the core 200 is shaped (before the pressure plate 16 is pressed down), the angle of the pressure plate 16 is automatically calculated and adjusted based on the amount of tab misalignment obtained during the winding process. By pressing the core 200 down at different angles of the pressure plate 16, the core 200 is shaped, thereby achieving the purpose of adjusting the tab misalignment problem.

[0106] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the invention. 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.

[0107] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, combinations, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for shaping a core, characterized in that, include: After the core is wound and before it is shaped, the angle of the pressure plate is adjusted to the shaping angle so that the pressure plate is tilted in a direction perpendicular to the surface of the core. The tilting direction of the pressure plate is the direction of the tab misalignment of the core. Then the pressure plate is driven to press on the core until the pressure plate is parallel to the surface of the core. The size of the shaping angle is calculated from the tab misalignment of the core and the single-sided thickness of the core. The core is racetrack shaped, and the single-sided thickness of the core is the thickness of the core on one side of the racetrack. The core shaping method includes: detecting the angle of the tabs of the core, and calculating the tab misalignment of the core based on the angle of the tabs; The angle at which the electrode tabs are located includes the angle at which the first electrode tab is located and the angle at which the last electrode tab is located. The core shaping method includes: Calculate the misalignment of the first electrode ear based on the angle at which the first electrode ear is located; Calculate the tail electrode misalignment based on the angle at which the tail electrode ear is located; The electrode misalignment of the core is calculated based on the misalignment of the first electrode and the misalignment of the tail electrode. The size of the shaping angle is determined by the following formula: γ=arctan(h / L), where γ represents the shaping angle, h represents the single-side thickness of the core, and L represents the amount of tab misalignment of the core.

2. The core shaping method according to claim 1, characterized in that, The misalignment of the tabs of the core is L, the misalignment of the first tab is D1, and the misalignment of the last tab is D2, where L = D2 - D1.

3. The core shaping method according to claim 1, characterized in that, The misalignment of the first electrode ear is determined by the following formula: D1=π×d1×α / 360, where D1 represents the distance between the first electrode ear and the center line of the core before the core is pressed, D1 is the misalignment of the first electrode ear, d1 represents the core diameter corresponding to the first electrode ear when it is fed into the core, and α represents the angle of the first electrode ear. The misalignment of the tail tab is determined by the following formula: D2=π×d2×(α-β) / 360, where D2 represents the distance between the tail tab and the center line of the core before the core is pressed, D2 is the misalignment of the tail tab, d2 represents the core diameter corresponding to the tail tab when it is fed in, and β represents the angle of the tail tab.

4. The core shaping method according to claim 1, characterized in that, The pressure plate is connected to a motor, and the core shaping method includes: The magnitude of the shaping angle is converted into the required number of pulse signals, and the pulse signals are used to control the operation of the motor to adjust the angle of the pressure plate to the shaping angle.

5. A winding device, characterized in that, include: An angle adjustment assembly, the angle adjustment assembly having a connecting shaft; A pressure plate, connected to the connecting shaft, is used for mechanically shaping the core. An angle adjustment assembly is used to drive the connecting shaft to rotate after the core is wound and before it is shaped, adjusting the angle of the pressure plate to a shaping angle so that the pressure plate tilts in a direction perpendicular to the surface of the core. The tilting direction of the pressure plate is the direction of the core's tab misalignment. The magnitude of the shaping angle is calculated from the tab misalignment amount of the core and the single-sided thickness of the core. A displacement adjustment assembly is connected to the pressure plate. The displacement adjustment assembly is used to drive the pressure plate to press on the core until the pressure plate is parallel to the surface of the core after the angle of the pressure plate is adjusted to the shaping angle. The winding equipment also includes a detection module, which is electrically connected to the angle adjustment component. The detection module is used to detect the angle of the tabs of the core and calculate the tab misalignment of the core based on the angle of the tabs. The angle of the electrode tab includes the angle of the first electrode tab and the angle of the last electrode tab. The detection module is used to calculate the misalignment of the first electrode tab based on the angle of the first electrode tab, calculate the misalignment of the last electrode tab based on the angle of the last electrode tab, and calculate the electrode tab misalignment of the core based on the misalignment of the first electrode tab and the misalignment of the last electrode tab. The size of the shaping angle is determined by the following formula: γ=arctan(h / L), where γ represents the shaping angle, h represents the single-side thickness of the core, and L represents the amount of tab misalignment of the core. The winding equipment also includes a control module. The angle adjustment component includes a motor and a connecting block. The connecting shaft is rotatably connected to the motor. The connecting block is fixedly connected to the connecting shaft and the pressure plate. The control module is electrically connected to the motor. The control module is used to convert the size of the shaping angle into the required number of pulse signals and use the pulse signals to control the motor to adjust the angle of the pressure plate to the shaping angle.

6. The winding device according to claim 5, characterized in that, The displacement adjustment assembly includes a cylinder, and the cylinder includes a control rod. The control rod is connected to the angle adjustment assembly. The displacement adjustment assembly is used to drive the angle adjustment assembly to press the pressure plate onto the core until the pressure plate is parallel to the surface of the core after the angle of the pressure plate is adjusted to the shaping angle.

7. The winding device according to claim 5, characterized in that, The winding device includes a control module electrically connected to the angle adjustment component. The control module has an operation page for displaying the operating status of the winding device, including the current angle of the pressure plate.

8. The winding device according to claim 5, characterized in that, The misalignment of the tabs of the core is L, the misalignment of the first tab is D1, and the misalignment of the last tab is D2, where L = D2 - D1.

9. The winding device according to claim 5, characterized in that, The misalignment of the first electrode ear is determined by the following formula: D1=π×d1×α / 360, where D1 represents the distance between the first electrode ear and the center line of the core before the core is pressed, D1 is the misalignment of the first electrode ear, d1 represents the core diameter corresponding to the first electrode ear when it is fed into the core, and α represents the angle of the first electrode ear. The misalignment of the tail tab is determined by the following formula: D2=π×d2×(α-β) / 360, where D2 represents the distance between the tail tab and the center line of the core before the core is pressed, D2 is the misalignment of the tail tab, d2 represents the core diameter corresponding to the tail tab when it is fed in, and β represents the angle of the tail tab.

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