A winding method, a winding machine, an electrode assembly, and a battery cell

Abstract

The application discloses a winding method, a winding machine, an electrode assembly and a battery monomer. The winding method comprises the following steps: clamping the head portions of an anode sheet, a cathode sheet and a diaphragm between a first half winding needle and a second half winding needle of a winding needle assembly at a winding station; and rotating the winding needle assembly at the winding station to wind the anode sheet, the cathode sheet and the diaphragm, so as to form an electrode assembly. The application can solve the problem that the head portions of the cathode sheet and the anode sheet are prone to being folded when the cathode sheet, the anode sheet and the diaphragm are wound in some cases.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a winding method, a winding machine, an electrode assembly, and a battery cell. Background Technology

[0002] In some cases, when winding cathode, anode, and diaphragm electrodes, the winding machine typically winds the diaphragm first, followed by the cathode and anode electrodes. Therefore, the heads of the cathode and anode electrodes are prone to kinking when winding begins. Summary of the Invention

[0003] In view of the above problems, this application provides a winding method, a winding machine, an electrode assembly, and a battery cell to solve the problem that the heads of the cathode and anode electrodes are prone to folding when winding the cathode electrode, anode electrode, and separator in some cases.

[0004] In a first aspect, embodiments of this application provide a winding method for winding a cathode electrode, an anode electrode, and a diaphragm to form an electrode assembly. The winding method includes: clamping the heads of the cathode electrode, the anode electrode, and the diaphragm between a first half-coil needle and a second half-coil needle of a winding needle assembly at a winding station; and rotating the winding needle assembly at the winding station to wind the cathode electrode, the anode electrode, and the diaphragm, thereby forming the electrode assembly.

[0005] The winding method provided in this application involves the first and second half-winding needles directly clamping the heads of the cathode, anode, and diaphragm before winding the cathode, anode, and diaphragm. This replaces the method used in some cases where the diaphragm is wound first, and then the cathode and anode are wound through the diaphragm. Therefore, it can prevent the cathode and anode from folding at the beginning of winding, thus solving the problem that the heads of the cathode and anode are prone to folding when winding the cathode, anode, and diaphragm in some cases.

[0006] In some embodiments of this application, the winding method further includes: cutting the cathode electrode upstream of the winding station; moving the winding needle assembly from the winding station to a downstream non-winding station; moving another winding needle assembly located at the non-winding station to the winding station; the other winding needle assembly located at the winding station clamping the head of the cathode electrode, anode electrode, and diaphragm for forming the next electrode assembly; and cutting the anode electrode and diaphragm between the winding station and the non-winding station.

[0007] In the solution provided in this application embodiment, the cathode electrode, anode electrode, and separator are wound simultaneously. The cathode electrode is first cut off, and then the anode electrode and separator are cut off again when the cathode electrode is completely wound, leaving only the anode electrode and separator. This eliminates the need to feed the heads of the cathode electrode, anode electrode, and separator between the first and second half-winding needles each time an electrode assembly is wound. The first and second half-winding needles at the winding station only need to hold the anode electrode and separator before cutting, and then cut the anode electrode and separator between the winding station and the non-winding station. This eliminates the need for multiple feeding operations and improves winding efficiency.

[0008] In some embodiments of this application, the winding method further includes: feeding the cut head of the cathode electrode sheet between the first half-coil needle and the second half-coil needle of another winding needle assembly located at the winding station. By placing the cut head of the cathode electrode sheet between the first half-coil needle and the second half-coil needle, the heads of the cathode electrode sheet, the anode electrode sheet, and the diaphragm can be clamped and wound to form the next electrode assembly.

[0009] In some embodiments of this application, the winding method further includes: upstream of the winding station, a clamping and feeding mechanism clamps and feeds the heads of the cathode electrode, anode electrode, and diaphragm together between the first half-winding needle and the second half-winding needle. Through the clamping and feeding mechanism, the heads of the cathode electrode, anode electrode, and diaphragm can be smoothly guided between the first half-winding needle and the second half-winding needle of the winding mechanism.

[0010] In some embodiments of this application, the winding method further includes, after the heads of the cathode electrode, anode electrode, and diaphragm enter between the first and second half-winding needles, a telescopic mechanism drives the clamping and feeding mechanism holding the cathode electrode, anode electrode, and diaphragm to shift in a first direction. The direction in which the heads of the cathode electrode, anode electrode, and diaphragm enter between the first and second half-winding needles is a second direction, and the first and second directions intersect. The telescopic mechanism driving the clamping and feeding mechanism to shift in the first direction allows the heads of the cathode electrode, anode electrode, and diaphragm to retract and be positioned between the first and second half-winding needles, thereby effectively preventing the accumulation of anode electrodes inside the electrode assembly and improving the quality of the electrode assembly.

[0011] In some embodiments of this application, the method further includes: downstream of the clamping and feeding mechanism, a first guide roller guides the anode electrode and the diaphragm; a first half-coil needle and a second half-coil needle extend to both sides of the anode electrode and the diaphragm; wherein the direction in which the cathode electrode, anode electrode, and diaphragm enter between the first half-coil needle and the second half-coil needle is a second direction, and the outer peripheral surface of the first guide roller is tangent to the second direction. The first guide roller provides tension to the anode electrode and the diaphragm, making the anode electrode and the diaphragm taut and with a small gap, so that they can smoothly enter between the first half-coil needle and the second half-coil needle without waiting for the clamping and feeding mechanism to clamp the cathode electrode, anode electrode, and diaphragm, thereby improving efficiency.

[0012] In some embodiments of this application, prior to the step of clamping the heads of the cathode electrode, anode electrode, and diaphragm between the first and second half-coils of the winding needle assembly at the winding station, the winding method further includes combining the cathode electrode, anode electrode, and diaphragm. By combining the cathode electrode, anode electrode, and diaphragm, the cathode electrode, anode electrode, and diaphragm can be effectively fixed together, making it easier for the heads of the cathode electrode, anode electrode, and diaphragm to enter between the first and second half-coils.

[0013] Secondly, embodiments of this application provide a winding machine, including: a winding mechanism including a winding needle assembly, the winding needle assembly being used to wind a cathode electrode, an anode electrode, and a diaphragm to form an electrode assembly, the winding needle assembly including a first half-winding needle and a second half-winding needle, the first half-winding needle and the second half-winding needle being configured to move relative to each other to clamp the heads of the cathode electrode, the anode electrode, and the diaphragm.

[0014] In the winding machine provided in this application embodiment, the winding needle assembly includes a first half-winding needle and a second half-winding needle that can move relative to each other. Before winding the cathode electrode, anode electrode, and diaphragm, the first half-winding needle and the second half-winding needle directly clamp the heads of the cathode electrode, anode electrode, and diaphragm being fed into the winding machine. This replaces the method used in some cases where the diaphragm is wound first, and then the cathode electrode and anode electrode are wound through the diaphragm. Therefore, it can avoid the cathode electrode and anode electrode from folding at the beginning of winding, thereby solving the problem that the heads of the cathode electrode and anode electrode are prone to folding when winding the cathode electrode, anode electrode, and diaphragm in some cases.

[0015] In some embodiments of this application, a clamping and feeding mechanism is further included, disposed upstream of the winding mechanism, for clamping and feeding the heads of the cathode electrode, anode electrode, and diaphragm between the first half-winding needle and the second half-winding needle. By providing a clamping and feeding mechanism upstream of the winding mechanism, the heads of the cathode electrode, anode electrode, and diaphragm can be smoothly guided between the first half-winding needle and the second half-winding needle of the winding mechanism.

[0016] In some embodiments of this application, the clamping and feeding mechanism includes a first clamping roller, a second clamping roller, and a driving mechanism. The first and second clamping rollers are configured to move relative to each other to clamp the cathode electrode, anode electrode, and diaphragm. The first and / or second clamping rollers are connected to the driving mechanism to transport the cathode electrode, anode electrode, and diaphragm. By driving the first and / or second clamping rollers to rotate through the driving mechanism, the traction drive of the cathode electrode, anode electrode, and diaphragm can be easily achieved, avoiding the problem of pulling and damaging the cathode electrode, anode electrode, and diaphragm.

[0017] In some embodiments of this application, a telescopic mechanism is further included, which is connected to a clamping and feeding mechanism for driving the clamping and feeding mechanism to move along a first direction after the cathode electrode, anode electrode, and diaphragm enter the first half-coil needle and the second half-coil needle; wherein the direction in which the cathode electrode, anode electrode, and diaphragm enter the first half-coil needle and the second half-coil needle is a second direction, and the first direction intersects with the second direction.

[0018] In this embodiment, the telescopic mechanism drives the clamping and feeding mechanism to shift in the first direction, which enables the heads of the cathode electrode, anode electrode, and diaphragm to retract and be placed between the first half-coil needle and the second half-coil needle, thereby effectively preventing the anode electrode from accumulating inside the electrode assembly and improving the quality of the electrode assembly.

[0019] In some embodiments of this application, the winding machine further includes a first guide roller disposed between the clamping and feeding mechanism and the winding needle assembly.

[0020] In this embodiment, by setting a first guide roller, the first guide roller provides tension to the anode electrode and the diaphragm, so that the anode electrode and the diaphragm are taut and tightly fitted, so that even if the cathode electrode does not enter the clamping and feeding mechanism, the anode electrode and the diaphragm can smoothly enter the gap between the first half-coil needle and the second half-coil needle.

[0021] In some embodiments of this application, the direction in which the cathode electrode, anode electrode, and diaphragm enter between the first half-winding needle and the second half-winding needle is the second direction, and the outer peripheral surface of the first guide roller is tangent to the second direction.

[0022] In this embodiment, the outer peripheral surface of the first guide roller is tangent to the second direction, which facilitates the anode sheet and the diaphragm to fit against the first guide roller during the conveying process, so that the first guide roller can provide tension for the anode sheet and the diaphragm.

[0023] In some embodiments of this application, the winding machine further includes a first cutter for cutting the cathode electrode sheet, the first cutter being disposed upstream of the winding mechanism.

[0024] In this embodiment, a first cutter is provided upstream of the winding mechanism, which can cut the cathode electrode sheet in a timely manner when the cathode electrode sheet is unwound to a preset length.

[0025] In some embodiments of this application, the winding mechanism further includes a turret with multiple needle winding assemblies. The turret is used to switch the multiple needle winding assemblies between a winding station and a non-winding station. The needle winding assemblies at the winding station are used to wind cathode electrodes, anode electrodes, and a diaphragm to form an electrode assembly. By switching the needle winding assemblies between the winding station and the non-winding station using the turret, continuous and uninterrupted production of the electrode assembly can be achieved.

[0026] In some embodiments of this application, the winding machine further includes a second cutter for cutting the anode electrode and the diaphragm. The second cutter is disposed between the winding station and the non-winding station. By disposing of the second cutter between the winding station and the non-winding station, the anode electrode and the diaphragm can be cut simultaneously after the cut cathode electrode is completely wound into the diaphragm.

[0027] In some embodiments of this application, the winding machine further includes a second guide roller located between the winding station and the non-winding station; wherein the direction in which the cathode electrode, anode electrode, and diaphragm enter between the first and second half-winding needles is a second direction, and the second guide roller is tangent to the second direction. By providing a second guide roller tangent to the second direction, the winding needle assembly located at the winding station can smoothly extend and clamp the cathode electrode, anode electrode, and diaphragm.

[0028] In some embodiments of this application, the first half-coil needle includes a first plane; the second half-coil needle includes a second plane; the first plane and the second plane are planes for clamping the cathode electrode, the anode electrode and the diaphragm; and a notch is formed at the end of the first plane or the second plane.

[0029] By forming a notch at the end of the first or second plane, the path between the anode electrode and the diaphragm is lengthened, allowing the cut ends of the anode electrode and diaphragm to be retracted into the winding needle assembly. This places the cathode electrode, anode electrode, and diaphragm inside the first and second half-winding needles, preventing them from winding around the outer circumference of the first or second half-winding needle, thus preventing anode electrode accumulation inside the electrode assembly and improving the quality of the electrode assembly.

[0030] Thirdly, embodiments of this application also provide an electrode assembly, which is manufactured using any of the winding methods described in the first aspect.

[0031] The electrode assembly of the battery cell provided in this application embodiment can be manufactured by the winding method described in the above embodiments. In this battery cell, the heads of the cathode and anode plates are flat, and the battery cell has the advantages of stable operation and safe and reliable use.

[0032] In some embodiments of this application, the electrode assembly includes: a cathode electrode, an anode electrode, and a diaphragm, with the head of the anode electrode flush with the head of the diaphragm.

[0033] In some embodiments of this application, the tail end of the anode electrode is flush with the tail end of the separator. Since the head and tail ends of the anode electrode are flush with the separator, the separator in the electrode assembly is significantly shorter than that in related technology electrode assemblies. Therefore, the length of the separator that does not participate in the electrode reaction is effectively reduced, and the energy density of the battery cell is improved.

[0034] Fourthly, embodiments of this application also provide a battery cell including any of the electrode components described in the third aspect above.

[0035] The battery cell provided in this application has all the beneficial effects of the electrode assembly described in the third aspect.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort. In the drawings, unless otherwise specified, the same reference numerals throughout multiple drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be regarded as a limitation on the scope of this application.

[0038] Figure 1 A flowchart illustrating a winding method provided in an embodiment of this application;

[0039] Figure 2 A flowchart illustrating another winding method provided in this application embodiment;

[0040] Figure 3 A flowchart illustrating another winding method provided in this application embodiment;

[0041] Figure 4 A schematic diagram of the structure of a winding machine clamping a cathode electrode, an anode electrode, and a diaphragm head, provided for an embodiment of this application;

[0042] Figure 5 A schematic diagram of the structure of a winding machine provided in this application during the cutting of the anode electrode and the diaphragm and the winding of the cathode electrode, the anode electrode and the diaphragm;

[0043] Figure 6 A schematic diagram of another winding machine clamping the cathode electrode, anode electrode, and diaphragm head, provided for an embodiment of this application;

[0044] Figure 7 for Figure 4 A schematic diagram of a winding needle assembly in a winding machine;

[0045] Figure 8 for Figure 4 A schematic diagram of another type of winding needle assembly in a winding machine;

[0046] Figure 9 This is a schematic diagram of the structure of an electrode assembly provided in an embodiment of this application.

[0047] The reference numerals in the detailed embodiments are as follows:

[0048] 1—Electrode assembly; 11—Cathode electrode; 12—Anode electrode; 13—Diaphragm;

[0049] 2—Winding mechanism;

[0050] 21—Needle winding assembly, 211—First half-coil, 212—Second half-coil, 213—Arc-shaped surface, 214—First plane, 215—Second plane, 216—Groove, 217—Third plane, 218—Notch, 219—Fourth plane, 220—Fifth plane;

[0051] 22—Turret, 221—Winding station, 222—Non-winding station;

[0052] 3—clamping and feeding mechanism; 31—first clamping roller; 32—second clamping roller;

[0053] 4—First cut; 5—Second cut;

[0054] 6—Second guide roller;

[0055] 7—Finishing adhesive application mechanism; 8—Material feeding mechanism; 9—First guide roller;

[0056] L—First direction; M—Second direction. Detailed Implementation

[0057] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0059] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0060] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0061] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0062] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0063] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0064] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0065] In some cases, when winding electrode assemblies, the head of the diaphragm is usually first clamped by the winding needle assembly and wound several times. Then, the heads of the cathode and anode plates are inserted between the two diaphragms and wound by clamping the cathode and anode plates between the two diaphragms. However, when the heads of the cathode and anode plates enter the two diaphragms, they are prone to colliding with the winding needle assembly, which can cause the heads of the cathode and anode plates to fold.

[0066] To address this issue, the applicant attempted to employ various structures, including air blowing mechanisms, guiding mechanisms, and adsorption mechanisms, to mitigate the collision between the heads of the cathode and anode plates and the winding needle assembly. However, none of these methods effectively resolved the aforementioned problem.

[0067] Through further research, the applicant proposes a winding method, a winding machine, a motor assembly, and a battery cell in this application. This solution uses a winding needle assembly to simultaneously clamp the heads of the cathode electrode, anode electrode, and separator for winding, so that the heads of the cathode, anode, and separator do not come into contact with the outer periphery of the winding needle assembly, thereby solving the problem of the cathode and anode electrodes colliding with the winding needle assembly and folding.

[0068] The following description, in conjunction with the accompanying drawings, will first illustrate a winding method provided in an embodiment of this application.

[0069] Please refer to Figure 1 , Figure 1 This is a flowchart illustrating a winding method provided in an embodiment of this application. The winding method provided in this application is used to wind a cathode electrode 11, an anode electrode 12, and a diaphragm 13 to form an electrode assembly 1. The method is applied to a winding machine. The winding machine includes a retractable winding needle assembly 21. The winding needle assembly 21 includes a first half-winding needle 211 and a second half-winding needle 212 that are movable relative to each other.

[0070] like Figure 1 As shown, the winding method may include the following steps:

[0071] S101, the heads of the cathode electrode 11, the anode electrode 12 and the diaphragm 13 are clamped between the first half-coil 211 and the second half-coil 212 of the coiling needle assembly 21 at the winding station 221.

[0072] Before winding the cathode electrode 11, anode electrode 12 and diaphragm 13, the first half-winding needle 211 and the second half-winding needle 212 directly clamp the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13 that are being fed in.

[0073] S102, the needle winding assembly 21 at the winding station 221 is rotated to wind the cathode electrode 11, the anode electrode 12 and the diaphragm 13, thereby forming the electrode assembly 1.

[0074] The rotation direction of the needle winding assembly 21 can be clockwise or counterclockwise. The specific rotation direction depends on the actual needs, and this application does not make a specific limitation in this regard.

[0075] The winding method provided in this application involves the first half-winding needle 211 and the second half-winding needle 212 directly clamping the heads of the cathode electrode 11, anode electrode 12, and diaphragm 13 before winding the cathode electrode 11, anode electrode 12, and diaphragm 13. This replaces the method used in some cases where the diaphragm 13 is wound first, and then the cathode electrode 11 and anode electrode 12 are wound through the diaphragm 13. Therefore, it can prevent the cathode electrode 11 and anode electrode 12 from folding at the beginning of winding, thereby solving the problem that the heads of the cathode electrode 11 and anode electrode 12 are prone to folding when winding the cathode electrode 11, anode electrode 12, and diaphragm 13 in some cases.

[0076] Please refer to Figure 2 , Figure 2 A flowchart illustrating another winding method provided in an embodiment of this application. This application also provides another winding method, which includes:

[0077] S201, the heads of the cathode electrode 11, the anode electrode 12 and the diaphragm 13 are clamped between the first half-coil 211 and the second half-coil 212 of the coiling needle assembly 21 at the winding station 221.

[0078] S202, the needle winding assembly 21 at the winding station 221 is rotated to wind the cathode electrode 11, the anode electrode 12 and the diaphragm 13.

[0079] In this embodiment, steps S201 to S202 are the same as steps S101 to S102 in the above embodiments, and will not be repeated here.

[0080] S203, the cathode electrode 11 is cut off upstream of the winding station 221.

[0081] S204, the needle coil assembly 21 is moved from the winding station 221 to the downstream non-winding station 222.

[0082] In this context, upstream and downstream refer to the incoming and outgoing directions of the cathode electrode 11, anode electrode 12, and diaphragm 13 relative to the winding station 221, and are not related to the position of the winding station 221 itself.

[0083] It should be noted that step S204, moving the coiling needle assembly 21, can be performed simultaneously with step S203, cutting the cathode electrode 11, or it can be performed before or after step S203, cutting the cathode electrode 11. The specific method chosen can be determined based on the actual length of the cathode electrode 11.

[0084] It is understandable that by moving the winding needle assembly 21 of the winding station 221 to the downstream non-winding station 222, preparations can be made in advance for the winding of the next electrode assembly 1, thereby keeping the production rhythm of the electrode assembly 1 continuous.

[0085] S205, move another needle assembly 21 located at the non-winding station 222 to the winding station 221.

[0086] It should be noted that the step of moving the other winding needle assembly 21 of the non-winding station 222 in S205 can be performed simultaneously with the step of moving the winding needle assembly 21 in S204, or it can be performed before or after the step of moving the winding needle assembly 21 in S204. This application embodiment does not specifically limit this.

[0087] S206, another winding needle assembly 21 located at the winding station 221 clamps the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13 for forming the next electrode assembly 1.

[0088] When another needle winding assembly 21 located at the non-winding station 222 moves to the winding station 221, the other needle winding assembly 21 can extend and clamp the head of the cathode electrode 11, anode electrode 12 and diaphragm 13 for forming the next electrode assembly 1.

[0089] S207, the anode electrode 12 and the diaphragm 13 are cut between the winding station 221 and the non-winding station 222.

[0090] After cutting the anode electrode 12 and the diaphragm 13, the above steps are repeated to continue clamping and winding the next electrode assembly 1. The previous electrode assembly 1 then proceeds to the subsequent steps of applying finishing adhesive and unloading. Since applying finishing adhesive and unloading are common knowledge in the art, they will not be described in detail here.

[0091] In the solution provided in this application embodiment, while winding the cathode electrode 11, anode electrode 12, and diaphragm 13, the cathode electrode 11 is cut off first. Then, when the cathode electrode 11 is completely wound, leaving only the anode electrode 12 and diaphragm 13, the anode electrode 12 and diaphragm 13 are cut off. This eliminates the need to feed the heads of the cathode electrode 11, anode electrode 12, and diaphragm 13 between the first half-winding needle 211 and the second half-winding needle 212 each time an electrode assembly 1 is wound. The first half-winding needle 211 and the second half-winding needle 212 at the winding station 221 only need to hold the anode electrode 12 and diaphragm 13 before cutting, and then cut the anode electrode 12 and diaphragm 13 between the winding station 221 and the non-winding station 222. This eliminates the need for multiple feedings and improves winding efficiency.

[0092] In some embodiments of this application, after step S203 of the above embodiments, the winding method may further include the following steps:

[0093] The head of the cut cathode electrode 11 is fed between the first half-coil 211 and the second half-coil 212 of another coiling assembly 21 located at the winding station 221.

[0094] It is understood that by placing the head of the cut cathode electrode 11 between the first half-coil needle 211 and the second half-coil needle 212, the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13 can be clamped and wound in step S206 of the above embodiment to form the next electrode assembly 1.

[0095] In some embodiments of this application, the above winding method further includes the following steps:

[0096] Upstream of the winding station 221, the clamping and feeding mechanism 3 clamps the heads of the cathode electrode 11, the anode electrode 12 and the diaphragm 13 together and feeds them between the first half-winding needle 211 and the second half-winding needle 212.

[0097] In this embodiment, a clamping and feeding mechanism 3 can be used to drive the cathode electrode 11, anode electrode 12, and diaphragm 13 into the winding mechanism 2. The clamping and feeding mechanism 3 smoothly guides the heads of the cathode electrode 11, anode electrode 12, and diaphragm 13 between the first half-winding needle 211 and the second half-winding needle 212 of the winding mechanism 2. For clarity, the specific structure of the clamping and feeding mechanism 3 is described in detail in the following device embodiment.

[0098] In some embodiments of this application, the above winding method may further include the following steps:

[0099] After the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13 enter between the first half-coil needle 211 and the second half-coil needle 212, the telescopic mechanism drives the clamping and feeding mechanism 3 that clamps the cathode electrode 11, anode electrode 12 and diaphragm 13 to shift in the first direction L. The direction in which the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13 enter between the first half-coil needle 211 and the second half-coil needle 212 is the second direction M. The first direction L intersects with the second direction M.

[0100] In this embodiment, the telescopic mechanism drives the clamping and feeding mechanism 3 to shift in the first direction L, which allows the heads of the cathode electrode 11, anode electrode 12, and diaphragm 13 to retract and be positioned between the first half-coil needle 211 and the second half-coil needle 212. This effectively prevents the anode electrode 12 from accumulating inside the electrode assembly 1 and improves the quality of the electrode assembly 1. The telescopic mechanism can be a cylinder, hydraulic cylinder, ball screw, etc., and can be flexibly selected according to actual needs in practical applications.

[0101] In some embodiments of this application, please refer to Figure 3 , Figure 3A flowchart illustrating another winding method provided in this application embodiment. The above winding method embodiment includes the following steps:

[0102] Step S301: The heads of the cathode electrode 11, the anode electrode 12 and the diaphragm 13 are clamped between the first half-coil 211 and the second half-coil 212 of the coiling needle assembly 21 at the winding station 221.

[0103] Step S302: Rotate the winding needle assembly 21 at the winding station 221 to wind the cathode electrode 11, the anode electrode 12 and the diaphragm 13.

[0104] Step S303: Cut the cathode electrode 11 upstream of the winding station 221.

[0105] Steps S301, S201, S302, and S203 are the same as those in S202 and S203, respectively, and will not be repeated here. It should be understood that steps S301 to S303 constitute the winding process of the first electrode assembly.

[0106] Step S304: Downstream of the clamping and feeding mechanism 3, the first guide roller 9 guides the anode plate 12 and the diaphragm 13.

[0107] Step S305: The first half-coil needle 211 and the second half-coil needle 212 extend to both sides of the anode plate 12 and the diaphragm 13.

[0108] The direction in which the cathode electrode 11, the anode electrode 12, and the diaphragm 13 enter between the first half-coil needle 211 and the second half-coil needle 212 is the second direction M, and the outer peripheral surface of the first guide roller 9 is tangent to the second direction M.

[0109] It should be understood that the above steps S304 and S305 are the winding process of other motor components after the first electrode assembly.

[0110] After the cathode electrode 11 is cut, when the cathode electrode 11 needs to enter the clamping and feeding mechanism 3, the clamping and feeding mechanism 3 needs to open so that the cathode electrode 11 can smoothly enter the clamping and feeding mechanism 3. However, when the anode electrode 12 and the diaphragm 13 are not clamped by the clamping and feeding mechanism 3, the gap is large. Due to space constraints, the gap between the first half-coil needle 211 and the second half-coil needle 212 is limited. When the first half-coil needle 211 and the second half-coil needle 212 extend to the clamping position, they will collide with the anode electrode 12 and the diaphragm 13. Therefore, it is necessary to wait for the clamping and feeding mechanism 3 to clamp the cathode electrode 11, the anode electrode 12 and the diaphragm 13 before the first half-coil needle 211 and the second half-coil needle 212 can extend and clamp the cathode electrode 11, the anode electrode 12 and the diaphragm 13, resulting in low production efficiency. In the solution provided in this application embodiment, by setting the first guide roller 9, tension can be provided for the anode electrode 12 and the diaphragm 13, so that the anode electrode 12 and the diaphragm 13 are taut and tightly attached, so that they can smoothly enter between the first half-coil needle 211 and the second half-coil needle 212 without waiting for the clamping and feeding mechanism 3 to clamp the cathode electrode 11, the anode electrode 12 and the diaphragm 13, thereby improving efficiency.

[0111] In some embodiments of this application, in the above-described winding method embodiments, before the step of clamping the heads of the cathode electrode 11, the anode electrode 12, and the diaphragm 13 between the first half-coil 211 and the second half-coil 212 of the winding needle assembly 21 at the winding station 221, the following steps may be included:

[0112] The cathode electrode 11, the anode electrode 12, and the diaphragm 13 are combined.

[0113] The solution provided in this application embodiment allows for the lamination of the cathode electrode 11, anode electrode 12, and diaphragm 13 before their heads are clamped in the winding needle assembly 21. Lamination methods include, but are not limited to, heated lamination or cold lamination by adding an adhesive to the diaphragm 13. The lamination of the anode electrode 12 and diaphragm 13 can be completed inside the winding machine, or it can be completed outside the winding machine and then wound by the winding machine.

[0114] In this embodiment of the application, by combining the cathode electrode 11, the anode electrode 12 and the diaphragm 13, the cathode electrode 11, the anode electrode 12 and the diaphragm 13 can be effectively fixed together, making it easier for the heads of the cathode electrode 11, the anode electrode 12 and the diaphragm 13 to enter between the first half-coil needle 211 and the second half-coil needle 212.

[0115] Please refer to Figure 4 and Figure 5 , Figure 4 A schematic diagram of the structure of a winding machine clamping a cathode electrode, an anode electrode, and a diaphragm head, provided for an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a winding machine provided in this application when cutting the anode electrode and the diaphragm and winding the cathode electrode, anode electrode and the diaphragm.

[0116] like Figure 4 and Figure 5 As shown in the illustration, this application also provides a winding machine, which includes:

[0117] The winding mechanism 2 includes a winding needle assembly 21 for winding the cathode electrode 11, the anode electrode 12 and the diaphragm 13 to form the electrode assembly 1. The winding needle assembly 21 includes a first half-winding needle 211 and a second half-winding needle 212, which are configured to move relative to each other to clamp the heads of the cathode electrode 11, the anode electrode 12 and the diaphragm 13.

[0118] The structure of the coiling needle assembly 21 can be varied, such as a columnar structure or a block structure; this columnar or block structure can be formed by splicing together a first half-coil needle 211 and a second half-coil needle 212. The structures of the first half-coil needle 211 and the second half-coil needle 212 will be described in detail below and will not be repeated here. Furthermore, both the first half-coil needle 211 and the second half-coil needle 212 can be located in the width direction of the cathode electrode 11 or the anode electrode 12 (e.g., ...). Figure 4 and Figure 5 The telescope extends and retracts (in the direction perpendicular to the paper) to clamp the cathode electrode 11, the anode electrode 12, and the diaphragm 13.

[0119] In the winding machine provided in this application embodiment, the winding needle assembly 21 includes a first half-winding needle 211 and a second half-winding needle 212 that can move relative to each other. Before winding the cathode electrode 11, anode electrode 12 and diaphragm 13, the first half-winding needle 211 and the second half-winding needle 212 directly clamp the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13, which replaces the method of first winding the diaphragm 13 and then winding the cathode electrode 11 and anode electrode 12 through the diaphragm 13 in some cases. Therefore, it can avoid the cathode electrode 11 and anode electrode 12 from folding when winding begins, thereby solving the problem that the heads of the cathode electrode 11 and anode electrode 12 are prone to folding when winding the cathode electrode 11, anode electrode 12 and diaphragm 13 in some cases.

[0120] In some embodiments of this application, the winding machine may further include: a clamping and feeding mechanism 3, disposed upstream of the winding mechanism 2, for clamping and feeding the heads of the cathode electrode 11, the anode electrode 12 and the diaphragm 13 between the first half-winding needle 211 and the second half-winding needle 212.

[0121] In this embodiment of the application, by setting a clamping and feeding mechanism 3 upstream of the winding mechanism 2, the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13 can be smoothly guided between the first half-winding needle 211 and the second half-winding needle 212 of the winding mechanism 2.

[0122] In some embodiments of this application, the clamping and feeding mechanism 3 includes a first clamping roller 31, a second clamping roller 32 and a driving mechanism. The first clamping roller 31 and the second clamping roller 32 are configured to move relative to each other to clamp the cathode electrode 11, the anode electrode 12 and the diaphragm 13. The first clamping roller 31 and / or the second clamping roller 32 are connected to the driving mechanism to transport the cathode electrode 11, the anode electrode 12 and the diaphragm 13.

[0123] In this embodiment, the first clamping roller 31 and / or the second clamping roller 32 are driven by a driving mechanism to rotate, which can conveniently realize the traction drive of the cathode electrode 11, the anode electrode 12 and the diaphragm 13, avoiding the problem of damage caused by pulling on the cathode electrode 11, the anode electrode 12 and the diaphragm 13.

[0124] Furthermore, since the clamping and feeding mechanism 3 actively clamps and feeds the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13 into the winding mechanism 2 through the driving mechanism, that is, the clamping and feeding mechanism 3 provides traction force to drive the cathode electrode 11, anode electrode 12 and diaphragm 13 to move, the forces on the cathode electrode 11, anode electrode 12 and diaphragm 13 can be more balanced, avoiding excessive deformation of the cathode electrode 11, anode electrode 12 and diaphragm 13.

[0125] In some embodiments of this application, the winding machine may further include: a telescopic mechanism connected to the clamping and feeding mechanism 3, used to drive the clamping and feeding mechanism 3 to move along a first direction L after the cathode electrode 11, anode electrode 12 and diaphragm 13 enter the first half-winding needle 211 and the second half-winding needle 212; wherein the direction in which the cathode electrode 11, anode electrode 12 and diaphragm 13 enter between the first half-winding needle 211 and the second half-winding needle 212 is a second direction M, and the first direction L intersects with the second direction M.

[0126] The clamping and feeding mechanism 3 provided in this embodiment can not only drive the cathode electrode 11, anode electrode 12, and diaphragm 13 to move, but also move under the drive of the telescopic mechanism. Specifically, the telescopic mechanism connected to the clamping and feeding mechanism 3 can push or pull the clamping and feeding mechanism 3 to move along the first direction L. The first direction L intersects with the second direction M between the cathode electrode 11 and diaphragm 13 entering the first half-coil needle 211 and the second half-coil needle 212. The included angle between the first direction L and the second direction M can be an obtuse angle, an acute angle, or a right angle.

[0127] In this embodiment, the telescopic mechanism drives the clamping and feeding mechanism 3 to shift in the first direction L, which enables the heads of the cathode electrode 11, anode electrode 12 and diaphragm 13 to retract and be placed between the first half-coil needle 211 and the second half-coil needle 212, thereby effectively preventing the anode electrode 12 from accumulating inside the electrode assembly 1 and improving the quality of the electrode assembly 1.

[0128] In some embodiments of this application, the winding machine may further include: a first cutter 4 for cutting the cathode electrode 11, the first cutter 4 being disposed upstream of the winding mechanism 2.

[0129] In this embodiment, a first cutter 4 is provided upstream of the winding mechanism 2, which can cut the cathode electrode 11 in a timely manner when the cathode electrode 11 is unwound to a preset length.

[0130] In some embodiments of this application, the winding mechanism 2 may further include a turret 22, on which a plurality of needle winding assemblies 21 are provided. The turret 22 is used to switch the plurality of needle winding assemblies 21 between a winding station 221 and a non-winding station 222. The needle winding assembly 21 at the winding station 221 is used to wind the cathode electrode 11, the anode electrode 12 and the diaphragm 13 to form the electrode assembly 1.

[0131] The turret 22 of the winding mechanism 2 can switch multiple needle winding assemblies 21 between winding station 221 and non-winding station 222 by rotating itself. The multiple needle winding assemblies 21 can be arranged in a ring array on the turret 22. The telescopic movement and rotation of the needle winding assemblies 21 relative to the turret 22 can realize the clamping, release and winding of the cathode electrode 11, anode electrode 12 and diaphragm 13.

[0132] The number of non-winding stations 222 is at least one. When there is only one non-winding station 222, it can be used simultaneously for applying finishing adhesive to the electrode assembly 1 and for unloading. When there are two or more non-winding stations 222, the electrode assembly 1 can be applied to one non-winding station 222 and unloaded at another non-winding station 222.

[0133] In this embodiment of the application, by switching the needle winding assembly 21 between the winding station 221 and the non-winding station 222 through the turret 22, the continuous and uninterrupted production of the electrode assembly 1 can be realized.

[0134] In some embodiments of this application, the winding machine may further include a second cutter 5, which is used to cut the anode electrode 12 and the diaphragm 13. The second cutter 5 is disposed between the winding station 221 and the non-winding station 222.

[0135] In this embodiment, a second cutter 5 is provided between the winding station 221 and the non-winding station 222, which can simultaneously cut the anode electrode 12 and the diaphragm 13 after the cut cathode electrode 11 is completely wound into the diaphragm 13.

[0136] When the second cutter 5 is used for cutting, the anode electrode 12 and the diaphragm 13 can be cut at the same time with one cut, instead of cutting the anode electrode 12 and the diaphragm 13 separately in two separate cuts. Furthermore, the heads of the cut anode electrode 12 and the diaphragm 13 are held by the winding needle assembly 21 when winding the next electrode assembly 1, without having to perform the feeding action again, thus further improving the winding efficiency.

[0137] In some embodiments of this application, see Figure 6 The winding machine also includes a first guide roller 9, which is disposed between the clamping and feeding mechanism 3 and the winding needle assembly 21.

[0138] During the process of the cathode electrode 11 being cut and entering the clamping and feeding mechanism 3, the clamping and feeding mechanism 3 is open so that the cathode electrode 11 can enter the clamping and feeding mechanism 3. Before the anode electrode 12 and the diaphragm 13 enter the needle winding assembly 2 from the clamping and feeding mechanism 3, the anode electrode 12 and the diaphragm 13 are not clamped by the clamping and feeding mechanism 3, which makes the anode electrode 12 and the diaphragm 13 relatively loose and with a large gap. In some cases, to prevent loose anode plates 12 and diaphragms 13 from entering between the first half-coil needle 211 and the second half-coil needle 212 and causing the anode plates 12 or diaphragms 13 to fold, the coiling needle assembly 21 will not extend to both sides of the anode plates 12 or diaphragms 13 before the cathode plates 11 enter the clamping and feeding mechanism 3. Only after the head of the cathode plates 11 enters the clamping and feeding mechanism 3, and the clamping and feeding mechanism 3 clamps the cathode plates 11, anode plates 12 and diaphragms 13, so that the cathode plates 11, anode plates 12 and diaphragms 13 are attached together, will the coiling needle assembly 21 extend to wind. In this embodiment, the first guide roller 9 provides tension to the anode electrode 12 and the diaphragm 13, making the anode electrode 12 and the diaphragm 13 taut and tightly fitted. Even if the cathode electrode 11 does not enter the clamping and feeding mechanism 3, the anode electrode 12 and the diaphragm 13 can smoothly enter the gap between the first half-coil needle 211 and the second half-coil needle 212 without waiting for the clamping and feeding mechanism 3 to clamp the cathode electrode 11, the anode electrode 12 and the diaphragm 13, thereby improving efficiency.

[0139] In some embodiments of this application, the direction in which the cathode electrode 11, the anode electrode 12, and the diaphragm 13 enter between the first half-coil needle 211 and the second half-coil needle 212 is the second direction M. The outer peripheral surface of the first guide roller 9 is tangent to the second direction M, so that the anode electrode 12 and the diaphragm 13 can fit against the first guide roller 9 during the conveying process, and the first guide roller 9 can provide tension for the anode electrode 12 and the diaphragm 13.

[0140] In some embodiments of this application, the winding machine may further include a second guide roller 6, which is located between the winding station 221 and the non-winding station 222; wherein the direction in which the cathode electrode 11, the anode electrode 12 and the diaphragm 13 enter between the first half-winding needle 211 and the second half-winding needle 212 is the second direction M, and the second guide roller 6 is tangent to the second direction M.

[0141] In this embodiment of the application, by setting a second guide roller 6 that is tangent to the second direction M, the winding needle assembly 21 located at the winding station 221 can smoothly extend and clamp the cathode electrode 11, the anode electrode 12 and the diaphragm 13.

[0142] In some embodiments of this application, such as Figure 7 and Figure 8 As shown, the first half-coil needle 211 includes a first plane 214; the second half-coil needle 212 includes a second plane 215; the first plane 214 and the second plane 215 are planes for clamping the cathode electrode 11, the anode electrode 12 and the diaphragm 13; a notch 218 is formed at the end of the first plane 214 or the second plane 215.

[0143] The notch 218 can be obtained by cutting off a portion of the structure of the first half-coil 211 or the second half-coil 212. In this application, the cross-sectional shapes of the first half-coil 211 and the second half-coil 212 are designed according to actual needs, for example, they can be as follows: Figure 7 The semicircle shown can also be as follows: Figure 8 The semi-rhombus shown. Figure 7 As shown, when the cross-section of the first half-coil needle 211 or the second half-coil needle 212 is semi-circular, after removing a portion of the structure, the semi-circle can include an arc-shaped surface 213, a first plane 214, and a third plane 217 connecting the arc-shaped surface 213 and the first plane 214; wherein the angle between the third plane 217 and the first plane 214 is an obtuse angle; and the radian of the arc-shaped surface 213 is less than π radians. For example... Figure 8 As shown, when the cross-section of the first half-coil needle 211 or the second half-coil needle 212 is triangular, after removing a part of the structure, the triangle may include a first plane 214, a fourth plane 219, a fifth plane 220, and a third plane 217 connecting the fifth plane 220 and the first plane 214.

[0144] In addition, the outer circumference of the first half-coil needle 211 and the second half-coil needle 212 is provided with a groove 216, which is used to clamp the electrode assembly 1 to realize the unloading of the electrode assembly 1.

[0145] In this embodiment, by forming a notch 218 at the end of the first plane 214 or the second plane 215, the path between the anode electrode 12 and the diaphragm 13 between the first plane 214 and the second plane 215 is lengthened. This allows the cut ends of the anode electrode 12 and the diaphragm 13 to be retracted into the winding needle assembly 21, thereby placing the cathode electrode 11, the anode electrode 12, and the diaphragm 13 inside the first half-winding needle 211 and the second half-winding needle 212. This prevents the cathode electrode 11, the anode electrode 12, and the diaphragm 13 from winding around the outer circumference of the first half-winding needle 211 or the second half-winding needle 212, preventing the anode electrode 12 from accumulating inside the electrode assembly 1 and improving the quality of the electrode assembly 1.

[0146] In order to apply finishing adhesive and cut the wound electrode assembly 1, such as Figure 4 and Figure 5 As shown, the winding machine provided in this application embodiment may further include a finishing adhesive application mechanism 7 and a feeding mechanism 8 disposed at the non-winding station 222. Since the finishing adhesive application mechanism 7 and the feeding mechanism 8 are common knowledge in the art, they will not be described in detail here.

[0147] In addition, see Figure 9 This application also provides an electrode assembly 1, which is manufactured using any of the above-described winding methods.

[0148] The electrode assembly 1 of the battery cell provided in this application embodiment can be manufactured by the winding method described in the above embodiment. It is understood that, since the method of the above embodiment clamps the heads of the cathode electrode 11, anode electrode 12 and separator 13 between the first half-winding needle 211 and the second half-winding needle 212 of the winding needle assembly 21 at the winding station 221 before the winding begins, the cathode electrode 11, anode electrode 12 and separator 13 manufactured by this method are located in the innermost circle of the electrode assembly 1.

[0149] In the battery cell provided in this application embodiment, the heads of the cathode electrode 11 and the anode electrode 12 are flat, and the battery cell has the advantages of stable operation and safe and reliable use.

[0150] In some embodiments of this application, the head of the anode electrode 12 is flush with the head of the diaphragm 13.

[0151] In some embodiments of this application, the tail of the anode plate 12 is flush with the tail of the diaphragm 13.

[0152] The electrode assembly 1 is formed by stacking and winding a cathode electrode 11, an anode electrode 12, and a separator 13. Depending on the winding direction, the anode electrode 12 can be placed on the top or bottom layer of the cathode electrode 11 and the separator 13. It should be noted that, for different positions of the anode electrode 12, corresponding winding directions can be used, so that the anode electrode 12 is located in the innermost layer of the electrode assembly 1.

[0153] In some cases, when winding the electrode assembly, the diaphragm 13 is wound first, followed by the cathode electrode 11 and the anode electrode 12. Therefore, in some cases, the electrode assembly has multiple turns of the diaphragm 13, which does not participate in the electrode reaction. Compared with electrode assemblies in related technologies, see [reference needed]. Figure 9 In this embodiment, since the head and tail of the anode plate 12 are flush with the separator 13, the separator 13 in the electrode assembly 1 is significantly shorter than that in the related technology. Therefore, the length of the separator 13 that does not participate in the electrode reaction is effectively reduced, and the energy density of the battery cell is improved.

[0154] Finally, this application embodiment also provides a battery cell including any of the electrode components 1 described above.

[0155] The battery cell provided in this application has all the beneficial effects of the electrode assembly 1 described above.

[0156] In some embodiments of this application, there are two diaphragms 13; the cathode electrode 11 is sandwiched between the two diaphragms 13.

[0157] In this embodiment, the cathode electrode 11 is sandwiched between two diaphragms 13, which can protect the cathode electrode 11 from the diaphragms 13 on both sides and improve the situation where the head of the cathode electrode 11 is bent.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A winding method for winding a cathode electrode tab (11), an anode electrode tab (12) and a separator (13) to form an electrode assembly (1), characterized by, The winding method includes: The heads of the cathode electrode (11), the anode electrode (12) and the diaphragm (13) are clamped between the first half-coil (211) and the second half-coil (212) of the coiling needle assembly (21) at the winding station (221); The needle winding assembly (21) at the winding station (221) is rotated to wind the cathode electrode (11), the anode electrode (12) and the diaphragm (13) to form the electrode assembly (1). The cathode electrode (11) is cut upstream of the winding station (221). The needle winding assembly (21) is moved from the winding station (221) to the downstream non-winding station (222). Move another needle assembly (21) located at the non-winding station (222) to the winding station (221); The head of the cut cathode electrode (11) is fed into the first half-coil (211) and the second half-coil (212) of the other coil assembly (21) located at the winding station (221); The other winding needle assembly (21) located at the winding station (221) holds the cathode electrode (11), the anode electrode (12) and the diaphragm (13) for forming the next electrode assembly (1). The anode sheet (12) and the diaphragm (13) are cut between the winding station (221) and the non-winding station (222). The clamping and feeding mechanism (3) is driven by the telescopic mechanism to shift in the first direction L, so that the heads of the cathode electrode (11), the anode electrode (12) and the diaphragm (13) retract and are placed between the first half-coil needle (211) and the second half-coil needle (212).

2. The winding method according to claim 1, characterized in that, The winding method further includes, Upstream of the winding station (221), the clamping and feeding mechanism (3) clamps and feeds the heads of the cathode electrode (11), the anode electrode (12) and the diaphragm (13) together between the first half-coil needle (211) and the second half-coil needle (212).

3. The winding method according to claim 2, characterized in that, The winding method further includes, After the heads of the cathode electrode (11), the anode electrode (12), and the diaphragm (13) enter between the first half-coil needle (211) and the second half-coil needle (212), the telescopic mechanism drives the clamping and feeding mechanism (3) that clamps the cathode electrode (11), the anode electrode (12), and the diaphragm (13) to shift in the first direction (L). The direction in which the heads of the cathode electrode (11), the anode electrode (12), and the diaphragm (13) enter between the first half-coil needle (211) and the second half-coil needle (212) is the second direction (M). The first direction (L) intersects with the second direction (M).

4. The winding method according to claim 2, characterized in that, The method further includes: Downstream of the clamping and feeding mechanism (3), the first guide roller (9) guides the anode plate (12) and the diaphragm (13). The first half-coil needle (211) and the second half-coil needle (212) of the other coiling needle assembly (21) of the winding station (221) extend to both sides of the anode plate (12) and the diaphragm (13); The direction in which the cathode electrode (11), the anode electrode (12), and the diaphragm (13) enter between the first half-coil needle (211) and the second half-coil needle (212) is the second direction (M), and the outer peripheral surface of the first guide roller (9) is tangent to the second direction (M).

5. The winding method according to any one of claims 1 to 4, characterized in that, Before the step of clamping the heads of the cathode electrode (11), the anode electrode (12), and the diaphragm (13) between the first half-coil (211) and the second half-coil (212) of the coiling needle assembly (21) at the winding station (221), the winding method further includes, The cathode electrode (11), the anode electrode (12), and the diaphragm (13) are combined.

6. A winding machine for use in the winding method as described in any one of claims 1-5, characterized in that, include: The winding mechanism (2) includes a winding needle assembly (21) for winding a cathode electrode (11), an anode electrode (12) and a diaphragm (13) to form an electrode assembly (1). The winding needle assembly (21) includes a first half-winding needle (211) and a second half-winding needle (212), which are configured to be relatively movable to clamp the heads of the cathode electrode (11), the anode electrode (12) and the diaphragm (13). A turret (22) is provided with a plurality of the aforementioned needle winding assemblies (21). The turret (22) is used to switch the plurality of the aforementioned needle winding assemblies (21) between a winding station (221) and a non-winding station (222). The needle winding assembly (21) in the winding station (221) is used to wind the cathode electrode (11), the anode electrode (12) and the diaphragm (13) to form the electrode assembly (1). The clamping and feeding mechanism (3) is located upstream of the winding mechanism (2) and is used to clamp and feed the heads of the cathode electrode (11), the anode electrode (12) and the diaphragm (13) between the first half-coil needle (211) and the second half-coil needle (212). The telescopic mechanism is connected to the clamping and feeding mechanism (3) and is used to drive the clamping and feeding mechanism (3) to move along the first direction (L) after the cathode electrode (11), the anode electrode (12) and the diaphragm (13) enter the first half-coil needle (211) and the second half-coil needle (212); The first cutter (4) is used to cut the cathode electrode (11), and the first cutter (4) is disposed upstream of the winding mechanism (2); The second cutter (5) is used to cut the anode plate (12) and the diaphragm (13). The second cutter (5) is disposed between the winding station (221) and the non-winding station (222).

7. The winding machine according to claim 6, characterized in that, The clamping and feeding mechanism (3) includes a first clamping roller (31), a second clamping roller (32) and a driving mechanism. The first clamping roller (31) and the second clamping roller (32) are configured to move relative to each other to clamp the cathode electrode (11), the anode electrode (12) and the diaphragm (13). The first clamping roller (31) and / or the second clamping roller (32) are connected to the driving mechanism to transport the cathode electrode (11), the anode electrode (12) and the diaphragm (13).

8. The winding machine according to claim 6 or 7, characterized in that, Also includes: The direction in which the cathode electrode (11), the anode electrode (12), and the diaphragm (13) enter between the first half-coil needle (211) and the second half-coil needle (212) is the second direction (M), and the first direction (L) intersects with the second direction (M).

9. The winding machine according to claim 6 or 7, characterized in that, The winding machine also includes: The first guide roller (9) is disposed between the clamping and feeding mechanism (3) and the needle winding assembly (21).

10. The winding machine according to claim 9, characterized in that, The direction in which the cathode electrode (11), the anode electrode (12), and the diaphragm (13) enter between the first half-coil needle (211) and the second half-coil needle (212) is the second direction (M), and the outer peripheral surface of the first guide roller (9) is tangent to the second direction (M).

11. The winding machine according to claim 6, characterized in that, The winding machine further includes a second guide roller (6), which is located between the winding station (221) and the non-winding station (222); wherein the direction in which the cathode electrode (11), the anode electrode (12) and the diaphragm (13) enter between the first half-winding needle (211) and the second half-winding needle (212) is a second direction (M), and the second guide roller (6) is tangent to the second direction (M).

12. The winding machine according to claim 6 or 7, characterized in that, The first half-coil needle (211) includes a first plane (214); the second half-coil needle (212) includes a second plane (215); the first plane (214) and the second plane (215) are planes that clamp the cathode electrode (11), the anode electrode (12) and the diaphragm (13); A notch (218) is formed at the end of the first plane (214) or the second plane (215).

13. An electrode assembly, characterized in that, The electrode assembly is manufactured using the winding method described in any one of claims 1 to 5.

14. The electrode assembly according to claim 13, characterized in that, include: The cathode electrode (11), the anode electrode (12), and the diaphragm (13) are provided, with the head of the anode electrode (12) being flush with the head of the diaphragm (13).

15. The electrode assembly according to claim 13 or 14, characterized in that, The tail of the anode plate (12) is flush with the tail of the diaphragm (13).

16. A single battery cell, characterized in that, Includes the electrode assembly as described in any one of claims 13-15.

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