Winding device and winding method

Abstract

This application relates to the technical field of battery preparation equipment and discloses a winding device and winding method. The winding device includes: a winding needle for winding a coil; a power supply assembly for electrically connecting to the winding needle to generate a current on the axis of the winding needle; and a magnetic supply assembly for providing a magnetic field to the winding needle, wherein the direction of the magnetic field intersects the axis of the winding needle, so that when the coil is wound, the winding needle generates an Ampere force in the magnetic field to resist deformation of the winding needle. By doing so, the present application can reduce deformation of the winding needle, reduce the defective rate of the wound product formed by winding the coil, and improve the quality of the wound product.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of battery preparation equipment, and specifically to a winding device and a winding method. Background Art

[0002] Wound electrode assemblies are widely used in the battery industry due to their stable performance and high manufacturing efficiency. The winding device used to prepare wound electrode assemblies primarily consists of a winding needle, which is used to wind the battery's coiled material (typically consisting of electrode sheets and the separator between them). The structure and shape of the winding needle directly impact the winding device's manufacturing efficiency and battery performance.

[0003] Currently, during coil winding, the winding needle deforms due to the tension of the coiled material. The thinner the needle and the faster the winding speed, the greater the deformation. This deformation can cause varying degrees of deformation and wrinkling of the battery's electrode sheets and separators, resulting in reduced performance of the electrode assembly and failure to meet required quality requirements. Summary of the Invention

[0004] In view of the above problems, the embodiments of the present application provide a winding device and a winding method to reduce deformation of the winding needle, reduce the defective rate of the wound products formed by winding the coil, and improve the quality of the wound products.

[0005] According to one aspect of an embodiment of the present application, a winding device is provided, comprising: a winding needle for winding a web; a power supply assembly for electrically connecting the winding needle to generate an electric current on the axis of the winding needle; and a magnet supply assembly for providing a magnetic field to the winding needle, wherein the direction of the magnetic field intersects the axis of the winding needle, so that when the web is wound, the winding needle generates an Ampere force in the magnetic field to resist deformation of the winding needle. During winding, the winding device of the embodiment of the present application provides a magnetic field to the winding needle through the magnet supply assembly and a current to the winding needle through the power supply assembly, depending on the magnitude and direction of the tension of the web on the winding needle. This allows the Ampere force exerted on the energized winding needle in the magnetic field to offset part or all of the tension of the web on the winding needle. Compared to conventional winding equipment, this approach reduces deformation of the winding needle, reduces the defective rate of the wound product formed by winding the web, and improves the quality of the wound product. Furthermore, the axial dimension of the winding needle can be made larger, the radial dimension can be made smaller, and the overall structure is more slender.

[0006] In one optional embodiment, the winding device further includes a controller and a pressure sensor, wherein the pressure sensor is used to detect the tension of the coil on the winding needle, and the controller is used to adjust the strength of the magnetic field and / or the strength of the current according to the tension detected by the pressure sensor. In this embodiment of the application, a pressure sensor is provided to monitor the tension of the coil on the winding needle in real time, so that the controller can adjust the strength of the magnetic field and / or the strength of the current passing through the winding needle according to the tension detected by the pressure sensor, thereby automatically adjusting the Ampere force on the winding needle in the magnetic field, reducing deformation of the winding needle, and making the adjustment control more accurate and reliable.

[0007] In one optional embodiment, the power supply assembly includes a current regulator electrically connected to the winding needle and the controller, respectively. The controller controls the current regulator to adjust the current intensity. In this embodiment, the controller automatically adjusts the current passing through the winding needle in real time by controlling the current regulator, providing simple and convenient control and enabling precise automated adjustment and control.

[0008] In an optional manner, the magnetization assembly includes a first excitation coil and a second excitation coil, wherein the first excitation coil and the second excitation coil are arranged on opposite sides of the winding needle; the magnetic poles of the first excitation coil and the second excitation coil facing the winding needle are opposite magnetic poles; and the controller controls the strength or direction of the magnetic field by adjusting the current of the first excitation coil and / or the second excitation coil. In this embodiment, the controller can change the magnetic field strength by controlling the current intensity passing through any one of the first excitation coil and the second excitation coil, and can also change the direction of the current of the first excitation coil and the second excitation coil, adjust the polarity of the magnetic poles of the first excitation coil and the second excitation coil facing the winding needle, and change the direction of the magnetic field passing through the winding needle. This method greatly improves the flexibility of adjusting the magnetic field passing through the winding needle.

[0009] In an optional manner, the first excitation coil and the second excitation coil are symmetrically arranged about the axis of the winding needle. In this manner, the direction of the magnetic field between the first excitation coil and the second excitation coil is perpendicular to the axis of the winding needle, which has a simple structure, facilitates the calculation of the Ampere force, and helps reduce the difficulty of regulating and controlling the magnetic field. In an optional manner, the magnetization assembly can rotate around the winding needle. In the embodiment of the present application, by arranging the magnetization assembly to rotate around the winding needle, when the direction of the tension of the coil on the winding needle changes during the winding process, the magnetization assembly can follow the change by rotating around the winding needle to ensure that the combined force of the Ampere force and the tension on the winding needle is in a smaller state, thereby reducing the deformation of the winding needle.

[0010] In one optional embodiment, the power supply assembly further includes a first conductive slip ring and a second conductive slip ring, wherein the first conductive slip ring is sleeved on one end of the winding needle, and the second conductive slip ring is sleeved on the other end of the winding needle, wherein the power supply assembly is electrically connected to the winding needle via the first and second conductive slip rings. In this embodiment, by providing the first and second conductive slip rings, which are rotatably sleeved on both ends of the winding needle, the connecting wires between the power supply assembly and the winding needle are prevented from being twisted or torn during the winding process.

[0011] In an optional embodiment, the winding device further includes a clamping assembly and a driving assembly, wherein the clamping assembly includes a first clamping assembly and a second clamping assembly, wherein the first clamping assembly and the second clamping assembly are respectively supported at both ends of the winding needle, and at least one of the first clamping assembly and the second clamping assembly is clamped and fixed to the winding needle and connected to the driving assembly so as to be driven by the driving assembly and drive the winding needle to rotate. In this embodiment, the two ends of the winding needle are respectively supported by the first clamping assembly and the second clamping assembly to reduce the vibration of the winding needle during winding; further, when the first clamping assembly and the second clamping assembly are respectively fixedly connected to the two ends of the winding needle and driven by the driving assembly, when the winding needle is winding, the two ends of the winding needle can be quickly started at the same time, and the structure is stable during rotation, with small vibration, small torque, and small deformation, so that the winding needle can adopt a more slender structure.

[0012] According to another aspect of an embodiment of the present application, a winding method is provided, comprising the aforementioned winding device, further comprising the following steps: winding a coil of material onto a winding needle of the winding device; energizing the winding needle to generate a current along the axis of the winding needle; and providing a magnetic field to the winding needle, wherein the direction of the magnetic field intersects the axis of the winding needle, so that the winding needle generates an Ampere force in the magnetic field to resist deformation of the winding needle. The method of this embodiment can reduce deformation of the winding needle during the winding process, lower the defective rate of wound products formed by winding the coil of material, and improve the quality of the wound products. Furthermore, the axial dimension of the winding needle can be made larger, the radial dimension can be made smaller, and a winding needle with a more slender overall structure can be used.

[0013] In one optional embodiment, the method further includes adjusting the current intensity and / or the magnetic field intensity based on the tension of the coil on the winding needle during rotation of the winding needle. In this embodiment, the current intensity and / or magnetic field intensity passing through the winding needle can be adjusted to adjust the Ampere force exerted on the winding needle in the magnetic field based on the tension of the coil on the winding needle, thereby reducing the resultant force exerted on the winding needle and minimizing deformation of the winding needle.

[0014] In one optional embodiment, the method further includes: rotating the magnet supply assembly around the winding needle as the winding needle rotates to adjust the direction of the magnetic field and reduce the combined force of the tension and the Ampere force on the winding needle. In this embodiment, the magnet supply assembly is rotated around the winding needle to adjust the direction of the magnetic field based on the direction of the tension of the coiled material on the winding needle, thereby reducing the combined force of the Ampere force and the tension on the winding needle, thereby reducing the deformation of the winding needle.

[0015] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0017] Figure 1 A schematic structural diagram of a winding device provided in an embodiment of the present application is shown;

[0018] Figure 2 A schematic diagram of the operation of needle winding to form a coil of an electrode assembly provided in an embodiment of the present application is shown;

[0019] Figure 3 A flow chart of the winding method provided in an embodiment of the present application is shown.

[0020] The accompanying drawings in the specific implementation manner are as follows:

[0021] 1. Winding device; 11. First pole piece; 12. Second pole piece; 13. Diaphragm; 10. Winding needle; 20. Controller; 30. Pressure sensor; 40. Current regulator; 41. First conductive slip ring; 42. Second conductive slip ring; 51. First excitation coil; 52. Second excitation coil; 61. First clamping assembly; 62. Second clamping assembly; 71. First servo motor; 72. Second servo motor. DETAILED DESCRIPTION

[0022] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0023] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0024] In the description of the embodiments of this application, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0025] In the description of the embodiments of this application, unless otherwise expressly specified or limited, technical terms such as "connection" and "fixed" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection of two components or the interaction between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0026] Currently, the main methods for preparing electrode assemblies include lamination and winding. The lamination method involves stacking a first electrode sheet, a second electrode sheet, and a separator to form an electrode assembly, while the winding method involves winding the first electrode sheet, a second electrode sheet, and a separator using a winding device to form an electrode assembly. The winding method is widely used for its high manufacturing efficiency and high quality.

[0027] Through research, the applicant discovered that during the winding process, the winding needle of the winding device is easily deformed by the tension of the coiled material. This deformation of the winding needle can easily lead to poor winding, affecting winding efficiency. Specifically, the first electrode sheet, the second electrode sheet, and the diaphragm are easily misaligned, making the wound electrode assembly prone to short-circuit risks during subsequent use; the first electrode sheet, the second electrode sheet, and the diaphragm are easily wrinkled, causing the volume of the wound electrode assembly to increase, resulting in a decrease in battery capacity. In other words, deformation of the winding needle will lead to a decrease in the quality of the wound electrode assembly, and ultimately to a decrease in battery performance. Furthermore, the smaller the diameter of the winding needle, the longer the length, and the faster the rotation speed, the greater the deformation of the winding needle and the worse the performance of the wound electrode assembly.

[0028] To address the existing problem of winding needles deforming due to coil tension during the winding process, resulting in poor winding and reduced quality of the wound product, the applicant has discovered that by applying an electric current to the winding needle and providing a magnetic field through it, the Ampere force acting on the needle can offset some or all of the tension exerted by the coil on the needle, effectively reducing needle deformation and thus improving the quality of the wound product. The technical solution of this application is described in detail below.

[0029] On the one hand, the embodiment of the present application provides a winding device 1, see Figure 1 , Figure 1 The structure of a winding device 1 provided in an embodiment of the present application is schematically shown. The winding device 1 comprises a winding needle 10, a power supply assembly, and a magnet supply assembly. The winding needle 10 is used to wind the coiled material; the power supply assembly is electrically connected to the winding needle 10 and is used to generate an electric current along the axis of the winding needle 10; and the magnet supply assembly is used to provide a magnetic field to the winding needle 10, with the direction of the magnetic field intersecting the axis of the winding needle 10. This allows the winding needle 10 to generate an Ampere force in the magnetic field to resist deformation when winding the coiled material.

[0030] The winding needle 10 can be made of a conductive material, including but not limited to metal materials such as copper, iron, magnesium, and aluminum. The metal material can be a single metal or an alloy. It is understandable that the winding needle 10 can also be a composite made of a conductive material and an insulating material, such as by coating or electroplating a conductive material layer on a winding needle base made of an insulating material, or by coating or electroplating an insulating material layer on a winding needle base made of a conductive material. The winding needle 10 can be a structural member such as a rod or a bar with a certain preset length, but is not limited to this. The shape of the winding needle 10 can be a prism (such as a regular square prism, a regular pentagonal prism, etc.), a cylinder, etc., but is not limited to this. The winding needle 10 can also be a structural member of other shapes or formed by multiple structural parts of different shapes. This application does not impose specific restrictions on this.

[0031] The coil can be a material used to form an electrode assembly, and can also be a material used to form other wound products. For ease of explanation, this embodiment uses the coil as an example of a material for forming a wound electrode assembly. Figure 2 As shown, Figure 2 The working diagram of the winding needle 10 provided in the embodiment of the present application is shown, in which the coiled material of the electrode assembly is wound; the coiled material includes a first electrode sheet 11, a second electrode sheet 12 and a diaphragm 13. The electrode assembly can be formed by winding the first electrode sheet 11, the second electrode sheet 12 and the diaphragm 13 using the winding needle 10, and then the electrode assembly is placed in a container filled with electrolyte to form a battery cell. The battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiment of the present application. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiment of the present application. Battery cells are generally divided into three types according to the packaging method: cylindrical batteries, square batteries and soft-pack batteries, which is not limited in the embodiment of the present application.

[0032] The power supply component may include a power supply (not shown in the figure), which may be a DC power supply. The positive output terminal and the negative output terminal of the power supply are electrically connected directly or indirectly to the two ends of the winding needle 10 respectively. The positive output terminal and the negative output terminal of the power supply are applied to the two ends of the winding needle 10 to form an electric potential difference, so that a current is formed on the winding needle 10 to flow along its axial direction.

[0033] The direction of the magnetic field provided by the magnetic supply component to the winding needle 10 intersects with the axial direction of the winding needle 10, that is, the direction of the magnetic field intersects with the direction of the current after the winding needle 10 is energized, so that when the winding needle 10 winds the coil, the winding needle 10 generates an Ampere force in the magnetic field to resist deformation.

[0034] The strength and direction of the magnetic field can be fixed or adjustable, and this application does not impose any restrictions on this. The angle formed by the axis of the winding needle 10 and the direction of the magnetic field generated by the magnetization assembly is in the range of (0, 180), that is, the axis of the winding needle 10 and the direction of the magnetic field can intersect perpendicularly or not. Preferably, the axis of the winding needle 10 and the direction of the magnetic field generated by the magnetization assembly intersect perpendicularly.

[0035] When in use, the winding needle 10 after being energized will be subjected to a force (i.e., Ampere force) in the magnetic field. The magnitude of the Ampere force on the winding needle 10 is f=IBLsinα, where I is the current passing through the winding needle 10, B is the magnetic field strength provided by the magnetic component, L is the length of the winding needle 10, and α is the angle between the current direction in the winding needle 10 and the magnetic field direction, where the current direction is consistent with the axial direction of the winding needle 10.

[0036] In the embodiment of the present application, a current is supplied to the winding needle 10 by a power supply assembly to flow along its axis, and a magnetic field is supplied through the magnetic supply assembly to pass through the winding needle 10. The direction of the magnetic field intersects the direction of the current, so that the Ampere force exerted on the winding needle 10 in the magnetic field after power is applied can offset part or all of the tension exerted by the coil on the winding needle 10 during winding. Compared with conventional winding equipment, the winding device 1 of the present application reduces deformation of the winding needle 10, reduces the possibility of deformation and misalignment of the coil during winding, reduces the defective rate of the wound product formed by the wound coil, and improves the quality of the wound product. At the same time, the axial dimension of the winding needle 10 can be larger and the radial dimension can be smaller. Given the same size and structure of the winding needle 10, the winding needle 10 of the present application can be wound at a higher speed, which is beneficial for improving winding efficiency. The axial direction of the winding needle 10 is consistent with the direction of the current after power is applied to the winding needle 10, and is also the length direction of the winding needle 10. The radial direction of the winding needle 10 is perpendicular to the axial direction.

[0037] Taking the coil as the material for forming a wound electrode assembly as an example, when winding the coil to form the electrode assembly, since the smaller the diameter of the winding needle 10, the more coils can be wound, and when the rotation speed of the winding needle 10 remains unchanged during winding, the winding needle 10 of the present application can use a winding needle 10 with a smaller diameter and a larger length, then the battery of the electrode assembly formed by winding with the winding needle 10 can have a higher energy density and stable and reliable quality and performance.

[0038] In some embodiments, the winding device 1 also includes a controller 20 and a pressure sensor 30. The controller 20 is electrically connected to the pressure sensor 30 and the power supply assembly, respectively. The pressure sensor 30 is used to detect the tension of the coil on the winding needle 10. The controller 20 is used to adjust the strength of the magnetic field and / or the strength of the current passing through the winding needle 10 according to the tension detected by the pressure sensor 30.

[0039] The controller 20 may be a PLC controller 20 , or may be a host computer, a single chip microcomputer, or other control circuits or control modules that can implement control functions, but is not limited thereto.

[0040] The pressure sensor 30 can be installed in the tension adjustment mechanism of the feeding device that feeds the coil to the winding needle 10. Specifically, the pressure sensor 30 can be installed on the roller in the tension adjustment mechanism that contacts the coil. The coil tension detected by the pressure sensor 30 is the coil tension (i.e., pulling force) applied to the winding needle 10.

[0041] In some embodiments, the controller 20 can adjust the strength of the magnetic field provided by the magnetic assembly according to the tension detected by the pressure sensor 30 to reduce or even eliminate the resultant force of the external force acting on the winding needle 10 and reduce the deformation of the winding needle 10 during the winding process.

[0042] In some embodiments, the controller 20 can adjust the intensity of the current provided by the power supply component to the winding needle 10 according to the tension detected by the pressure sensor 30 to reduce or even eliminate the resultant force of the external force acting on the winding needle 10 and reduce the deformation of the winding needle 10 during the winding process.

[0043] In some embodiments, the controller 20 can simultaneously adjust the strength of the magnetic field provided by the magnetic component and the strength of the current provided by the power supply component to the winding needle 10 according to the tension detected by the pressure sensor 30, so as to reduce or even eliminate the resultant force of the external forces acting on the winding needle 10 and reduce the deformation of the winding needle 10 during the winding process.

[0044] In the embodiment of the present application, a pressure sensor 30 is provided to monitor the tension of the coiled material on the winding needle 10 in real time. When the pressure sensor 30 detects a change in the coiled material tension, it transmits the change to the controller 20 via an electrical signal. The controller 20 converts the received electrical signal into a corresponding tension value and, based on the Ampere force formula and the two-force equilibrium condition, adjusts the intensity of the magnetic field and / or the intensity of the current passing through the winding needle 10 using a predetermined algorithm. This automatically adjusts the Ampere force exerted on the winding needle 10 in the magnetic field, reduces deformation of the winding needle 10, and makes the adjustment control more accurate and reliable.

[0045] In some embodiments, since the rotation speed of the winding needle 10 is unstable at the beginning of winding, the winding needle 10 is subjected to a large tension from the coil. At this time, the current intensity and / or magnetic field intensity passing through the winding needle 10 can be increased to increase the magnitude of the Ampere force exerted on the winding needle 10 and reduce the degree of deformation of the winding needle 10; in the stable rotation speed stage of the winding needle 10, the tension from the coil exerted on the winding needle 10 will become smaller. At this time, the current intensity and / or magnetic field intensity passing through the winding needle 10 can be reduced to reduce the magnitude of the Ampere force exerted on the winding needle 10 and reduce the degree of deformation of the winding needle 10.

[0046] In some embodiments, the power supply assembly includes a current regulator 40 , which is electrically connected to the winding needle 10 and the controller 20 , respectively. The controller 20 adjusts the current passing through the winding needle 10 by adjusting the current regulator 40 .

[0047] In some embodiments, the current regulator 40 and the controller 20 can be electrically connected to a power supply so that the power supply provides the current regulator 40 and the controller 20 with the electrical energy required for their operation, wherein the power supply is electrically connected to both ends of the winding needle 10 through the current regulator 40. Specifically, the positive output end of the power supply is electrically connected to the positive input end of the current regulator 40, the negative output end of the power supply is electrically connected to the negative input end of the current regulator 40, the positive output end of the current regulator 40 is electrically connected to one end of the winding needle 10, and the negative output end of the current regulator 40 is electrically connected to the other end of the winding needle 10, that is, the positive output end and the negative output end of the power supply are electrically connected to the winding needle 10 through the current regulator 40.

[0048] It should be noted that the current regulator 40 and the controller 20 may also be powered by their own power supplies. The current regulator 40 is a DC current regulator, that is, the current regulator 40 is used to regulate the DC current passing through the winding needle 10 .

[0049] In this embodiment, the controller 20 can automatically adjust the current passing through the winding needle 10 in real time by controlling the current regulator 40. The control is simple and convenient, and accurate automatic adjustment can be achieved.

[0050] In some embodiments, the magnetization assembly includes a first excitation coil 51 and a second excitation coil 52. The first excitation coil 51 and the second excitation coil 52 are disposed on opposite sides of the winding needle 10, and the controller 20 is electrically connected to the first excitation coil 51 and the second excitation coil 52, respectively. The controller 20 can also be configured to control the current intensity passing through the first excitation coil 51 and / or the second excitation coil 52 based on the tension detected by the pressure sensor 30, thereby adjusting the intensity or direction of the magnetic field passing through the winding needle 10.

[0051] The first excitation coil 51 and the second excitation coil 52 may be a single excitation coil unit formed by a metal wire arranged in a spiral or vortex shape, or may be an excitation winding formed by a metal wire wound around a substrate made of ferromagnetic material.

[0052] In some embodiments, the controller 20 uses an AC current regulator to synchronously regulate the current intensity passing through the first excitation coil 51 and the second excitation coil 52. Specifically, the controller 20 can be electrically connected to the first excitation coil 51 and the second excitation coil 52 through an AC current regulator, that is, the positive output terminal of the AC current regulator is electrically connected to one end of each of the first excitation coil 51 and the second excitation coil 52, and the negative output terminal of the AC current regulator is electrically connected to the other end of each of the first excitation coil 51 and the second excitation coil 52.

[0053] In some embodiments, the controller 20 separately adjusts the current intensity passing through the first excitation coil 51 and the second excitation coil 52 through two independent AC current regulators. Specifically, the controller 20 is electrically connected to the first excitation coil 51 and the second excitation coil 52 through two independent AC current regulators. That is, the first excitation coil 51 is electrically connected to the controller 20 through one AC current regulator, and the second excitation coil 52 is electrically connected to the controller 20 through another AC current regulator, thereby achieving independent adjustment of the first excitation coil 51 and the second excitation coil.

[0054] It should be noted that, in some embodiments, the controller 20 may convert the direct current of the power supply into alternating current, and then transmit the alternating current to the first excitation coil 51 and / or the second excitation coil 52 via an alternating current regulator. Of course, it is understood that, in other embodiments, the power supply assembly may also include an alternating current power supply, and the controller 20 may be electrically connected to the alternating current power supply and the alternating current regulator, respectively, so as to provide the alternating current power to the first excitation coil 51 and / or the second excitation coil 52 via the alternating current regulator.

[0055] In the embodiment of the present application, the controller 20 can control the current intensity passing through either the first excitation coil 51 or the second excitation coil 52, thereby changing the magnetic field intensity. It can also change the direction of the current in the first excitation coil 51 or the second excitation coil 52, adjusting the polarity of the magnetic poles of the first excitation coil 51 or the second excitation coil 52 toward the side of the winding needle 10, thereby changing the direction of the magnetic field passing through the winding needle 10. This method greatly improves the flexibility of adjusting the magnetic field passing through the winding needle 10. Furthermore, when the controller 20 simultaneously adjusts the intensity of the magnetic field provided by the magnetic supply assembly and the intensity of the current provided by the power supply assembly to the winding needle 10 to reduce the degree of deformation of the winding needle 10, it can reasonably distribute the current through the winding needle 10, the first excitation coil 51, and the second excitation coil 52, thereby avoiding problems such as excessive heating of the winding needle 10, the first excitation coil 51, and the second excitation coil 52 due to excessive current, or even affecting the quality of the wound product or the working state of the winding device 1.

[0056] In some embodiments, the first excitation coil 51 and the second excitation coil 52 are symmetrically arranged with respect to the axis of the winding needle 10 .

[0057] That is, the central axis of the first excitation coil 51 and the central axis of the second excitation coil 52 are perpendicular to the axis of the winding needle 10, that is, the direction of the magnetic field between the first excitation coil 51 and the second excitation coil 52 is perpendicular to the axis of the winding needle 10. This method has a simple structure. When the winding needle 10 is wound, the magnitude of the Ampere force it receives is f=IBL, which facilitates the calculation of the Ampere force and helps reduce the difficulty of adjusting and controlling the magnetic field.

[0058] Those skilled in the art will appreciate that, in other embodiments, when the strength of the magnetic field provided by the magnetization assembly is fixed, the first excitation coil 51 and the second excitation coil 52 may be replaced by magnets. The magnets may be permanent magnets or soft magnets. Specifically, the magnets may be magnets, meaning that the magnetization assembly may be two magnets disposed oppositely on either side of the winding needle 10.

[0059] In some embodiments, the magnet supply assembly is configured to rotate around the winding needle 10 .

[0060] The magnet supply assembly can be driven manually to rotate around the winding needle 10, or it can be driven by electromechanical control to rotate around the winding needle 10. Preferably, the magnet supply assembly is driven by electromechanical control to rotate around the winding needle 10. Specifically, the magnet supply assembly can rotate around the winding needle 10 with the axis of the winding needle 10 as the rotation center, that is, the first excitation coil 51 and the second excitation coil 52 rotate around the winding needle 10 with the axis of the winding needle 10 as the rotation center. It is understandable that in other embodiments, the magnet supply assembly may also rotate around the winding needle 10 without using the axis of the winding needle 10 as the rotation center.

[0061] As the number of layers of coiled material wound on the winding needle 10 increases during the winding process, the diameter of the coiled material on the outer surface of the winding needle 10 will become larger and larger, causing the direction of the pulling force of the coiled material on the winding needle 10 to change. If the direction of the magnetic field is not adjusted, the Ampere force exerted on the winding needle 10 may not be able to effectively reduce the tension of the coiled material on the winding needle 10, causing the deformation of the winding needle 10 to be aggravated.

[0062] Therefore, in the embodiment of the present application, the magnet supply component is arranged to rotate around the axis of the winding needle 10, so that when the direction of the tension of the coil on the winding needle 10 changes, the magnet supply component can rotate around the winding needle 10 to change the direction of the magnetic field accordingly, and ultimately the Ampere force exerted on the winding needle 10 and the tension of the coil exerted on the winding needle 10 are always on the same straight line and in opposite directions, so as to ensure that the resultant force exerted on the winding needle 10 is in a smaller state, thereby reducing the deformation of the winding needle 10.

[0063] In some embodiments, the controller 20 can adjust the direction of the magnetic field in real time according to the direction of the tension, that is, use electromechanical control to drive the magnetic supply component to rotate around the winding needle 10, thereby reducing the deformation of the winding needle 10 by adjusting the magnetic field through automatic control.

[0064] In some embodiments, the power supply assembly further includes a first conductive slip ring 41 and a second conductive slip ring 42, wherein the first conductive slip ring 41 is sleeved on one end of the winding needle 10, and the second conductive slip ring 42 is sleeved on the other end of the winding needle 10, wherein the power supply assembly is electrically connected to the winding needle 10 through the first conductive slip ring 41 and the second conductive slip ring 42.

[0065] Specifically, the two ends of the winding needle 10 are electrically connected to the positive output end and the negative output end of the current regulator 40 through the first conductive slip ring 41 and the second conductive slip ring 42, that is, the first conductive slip ring 41 and the second conductive slip ring 42 are connectors for electrically connecting the power supply component to the winding needle 10. If the connecting wires of the power supply component are directly fixedly connected to the two ends of the winding needle 10, the connecting wires are easily twisted or torn off when the winding needle 10 is wound, resulting in the power supply component being unable to continuously supply power to the winding needle 10 during the winding process. The conductive slip ring can be used in any electromechanical system that requires continuous rotation while transmitting power and signals from a fixed position to a rotating position. Therefore, in the example of the present application, the first conductive slip ring 41 and the second conductive slip ring 42 are respectively rotatably sleeved on the two ends of the winding needle 10, which can prevent the power supply component from being twisted or torn off during the rotation of the winding needle 10.

[0066] It should be noted that the two ends of the winding needle 10 in this application do not only refer to the two ends of the winding needle 10 in its axial direction, but refer to the position on the winding needle 10 outside the coil and not covered by the coil when the winding needle 10 is winding the coil.

[0067] In some embodiments, the winding device 1 also includes a clamping assembly and a driving assembly, the clamping assembly includes a first clamping assembly 61 and a second clamping assembly 62, the first clamping assembly 61 and the second clamping assembly 62 are respectively supported at both ends of the winding needle 10, at least one of the first clamping assembly 61 and the second clamping assembly 62 is clamped and fixed to the winding needle 10 and connected to the driving assembly so as to be driven by the driving assembly and drive the winding needle 10 to rotate.

[0068] The first clamping assembly 61 and the second clamping assembly 62 may be clamps, such as, but not limited to, a three-jaw chuck. The first clamping assembly 61 may be supported on one end of the winding needle 10 where the first conductive slip ring 41 is sleeved, and the second clamping assembly 62 may be supported on the other end of the winding needle 10 where the second conductive slip ring 42 is sleeved. Alternatively, the first clamping assembly 61 may be supported on one end of the winding needle 10 where the second conductive slip ring 42 is sleeved, and the second clamping assembly 62 may be supported on the other end of the winding needle 10 where the first conductive slip ring 41 is sleeved.

[0069] One of the first clamping assembly 61 and the second clamping assembly 62 can be clamped and fixed to one end of the winding needle 10, and the other can be clamped and fixed or rotatably connected to the other end of the winding needle 10, and the driving assembly is fixedly connected to the one clamped and fixed by the winding needle 10, so that the driving assembly can drive the winding needle 10 to rotate through the first clamping assembly 61 and / or the second clamping assembly 62 fixed thereto.

[0070] As a preferred embodiment, the first clamping assembly 61 and the second clamping assembly 62 are respectively clamped and fixed to the two ends of the winding needle 10. The drive assembly includes a first servo motor 71 and a second servo motor 72. The output shaft of the first servo motor 71 is fixedly connected to the first clamping assembly 61; the output shaft of the second servo motor 72 is fixedly connected to the second clamping assembly 62.

[0071] During the winding process, if only one end of the winding needle 10 is held in place by either the first clamping assembly 61 or the second clamping assembly 62, vibration is likely to occur. Furthermore, if one end of the winding needle 10 is driven by a motor while the other end rotates passively, the two ends of the winding needle 10 rotate at different speeds during the initial stages of rotation. This creates a torque on the winding needle 10, which can easily cause it to twist and deform.

[0072] Therefore, in the embodiment of the present application, one end of the winding needle 10 is fixed to the rotating shaft of the first servo motor 71 through the first clamping assembly 61, and the other end of the winding needle 10 is fixed to the rotating shaft of the second servo motor 72 through the second clamping assembly 62, so that during winding, both ends of the winding needle 10 can rotate at the same time. In this way, the winding needle 10 starts quickly, has a stable structure during rotation, has little vibration, is subjected to little torque, and has little deformation. A thinner and longer winding needle 10 can be used, that is, the axial dimension of the winding needle 10 can be made larger, and the radial dimension can be made smaller.

[0073] In another aspect of the embodiment of the present application, a winding method is also provided, which can be used to roll a coil of material to form an electrode assembly, but is not limited thereto. The winding method includes the winding device 1 in the above embodiment. The specific structure and function of the winding device 1 can be referred to the above embodiment, and will not be repeated here. Figure 3 As shown, combined with Figure 1 , Figure 3 The flowchart of the winding method provided in the embodiment of the present application is shown. The winding method includes the following steps:

[0074] Winding the coil onto the winding needle 10 of the winding device 1;

[0075] Energizing the winding needle 10 to generate a current on the axis of the winding needle 10;

[0076] A magnetic field is provided to the winding needle 10 , wherein the direction of the magnetic field intersects the axis of the winding needle 10 , so that the winding needle 10 generates an Ampere force in the magnetic field for resisting deformation of the winding needle 10 .

[0077] The coiled material can be any material used to form an electrode assembly, or any other wound product, without specific limitation. The power supply assembly of the winding device 1 is used to supply power to the winding needle 10, thereby generating an electric current along the axial direction of the winding needle 10. The magnetic supply assembly of the winding device 1 is used to provide a magnetic field passing through the winding needle 10, with the direction of the magnetic field intersecting the direction of the current.

[0078] The method of the present invention, during the winding process, energizes and provides a magnetic field through the winding needle 10, so that the Ampere force acting on the winding needle can offset at least a portion of the tension acting on the winding needle 10, thereby reducing the total force acting on the winding needle 10, minimizing deformation of the winding needle 10 during the winding process, reducing the defective rate of the wound product formed by the coil, and improving the quality of the wound product. The wound product can be an electrode assembly or other wound product. Through this method, the axial dimension of the winding needle 10 can be made larger and the radial dimension can be made smaller, allowing the use of a winding needle 10 with a more slender overall structure.

[0079] In some embodiments, the method further comprises: adjusting the current intensity according to the tension of the coiled material on the coiled material, and / or adjusting the magnetic field intensity according to the tension of the coiled material on the coiled material.

[0080] The current intensity of the winding needle 10 can be adjusted by the power supply component, and the magnetic field intensity can be adjusted by the magnetic supply component.

[0081] In this embodiment, by adjusting at least one of the current intensity and the magnetic field intensity of the winding needle 10 according to the tension of the coil on the winding needle 10, the Ampere force exerted on the winding needle 10 in the magnetic field can be adjusted to reduce the resultant force exerted on the winding needle 10, thereby reducing the deformation of the winding needle 10.

[0082] In some embodiments, when the winding needle 10 rotates, the magnet supply assembly is rotated around the winding needle 10 to adjust the direction of the magnetic field and reduce the combined force of the tension and Ampere force on the winding needle 10.

[0083] In this embodiment, during the winding process, the direction of the magnetic field is adjusted according to the tension direction of the coil on the winding needle 10 to reduce the combined force of the Ampere force and the tension on the winding needle 10, thereby reducing the stress deformation of the winding needle 10.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A winding device, characterized in that: include: roll A needle for winding a coil to form an electrode assembly; a power supply assembly for electrically connecting to the winding needle to form a current on the axis of the winding needle; a magnet supply assembly for providing a magnetic field to the winding needle, wherein the direction of the magnetic field intersects the axis of the winding needle, so that when the coil is wound, the winding needle generates an Ampere force in the magnetic field for resisting deformation of the winding needle; The winding device further includes a controller and a pressure sensor, wherein the pressure sensor is used to detect the tension of the coil on the winding needle, and the controller is used to adjust the intensity of the magnetic field and / or the intensity of the current according to the tension detected by the pressure sensor; The magnetic supply assembly includes a first excitation coil and a second excitation coil, wherein the first excitation coil and the second excitation coil are arranged on opposite sides of the winding needle; the magnetic poles of the first excitation coil and the second excitation coil facing the winding needle are opposite magnetic poles; The controller controls the intensity or direction of the magnetic field by adjusting the current of the first excitation coil and / or the second excitation coil; The magnet supply component can rotate around the winding needle.

2. The winding device according to claim 1, characterized in that The power supply assembly includes a current regulator, which is electrically connected to the winding needle and the controller respectively. The controller adjusts the intensity of the current by controlling the current regulator.

3. The winding device according to claim 1, characterized in that The first excitation coil and the second excitation coil are symmetrically arranged about the axis of the winding needle.

4. The winding device according to any one of claims 1 to 3, characterized in that: The power supply assembly further includes a first conductive slip ring and a second conductive slip ring, wherein the first conductive slip ring is sleeved on one end of the winding needle, and the second conductive slip ring is sleeved on the other end of the winding needle, wherein the power supply assembly is electrically connected to the winding needle through the first conductive slip ring and the second conductive slip ring.

5. The winding device according to any one of claims 1 to 3, characterized in that: The winding device also includes a clamping assembly and a driving assembly, the clamping assembly includes a first clamping assembly and a second clamping assembly, the first clamping assembly and the second clamping assembly are respectively supported at both ends of the winding needle, at least one of the first clamping assembly and the second clamping assembly is clamped and fixed to the winding needle and connected to the driving assembly so as to be driven by the driving assembly and drive the winding needle to rotate.

6. A winding method, characterized in that: include: The winding device according to any one of claims 1 to 5, wherein the method further comprises the following steps: Winding the coiled material onto the winding needle of the winding device; energizing the winding needle to generate a current on the axis of the winding needle; providing a magnetic field to the winding needle, wherein the direction of the magnetic field intersects the axis of the winding needle, so that the winding needle generates an Ampere force in the magnetic field for resisting deformation of the winding needle; The method further includes: when the winding needle rotates, rotating the magnet supply assembly around the winding needle to adjust the direction of the magnetic field and reduce the combined force of the tension of the coil on the winding needle and the Ampere force on the winding needle.

7. The winding method according to claim 6, characterized in that The method further comprises: When the winding needle rotates, the intensity of the current is adjusted according to the tension of the coiled material on the winding needle, and / or the intensity of the magnetic field is adjusted according to the tension of the coiled material on the winding needle.

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