Copper Foil Coil Production Device, Copper Foil Coil Packaging Material, and Copper Foil Coil Annealing Method

Abstract

The present invention relates to a copper foil coil production device, a packaging material for a copper foil coil, and an annealing method for a copper foil coil, belonging to the technical field of air conditioning equipment. The annealing method includes obtaining the packaging material for the copper foil coil; the packaging material includes a copper foil patch made of the same material as the copper foil coil; fitting and covering the packaging material at the end of the copper foil coil to obtain a coil to be annealed; annealing the coil to be annealed to obtain a finished coil. The present invention can achieve a tight seal at the end of the coil, reduce the decomposition of the anti-oxidation layer at the end of the coil during annealing and the diffusion of the decomposed product into the interior of the coil, and achieve the effect of improving the production quality of the finished rolled copper foil coil.

Description

Technical Field

[0001] The present invention relates to the technical field of rolled copper foil production, and particularly to a copper foil coil production device, a packaging material for a copper foil coil, and an annealing method for a copper foil coil. Background Art

[0002] Rolled copper foil is copper foil formed by rolling. Through annealing treatment, the ductility of the copper foil can be further increased, so as to obtain soft-state rolled copper foil that can be applied to high-end shielding materials, printed circuits and other fields. The annealing treatment process requires winding the copper foil around a steel core, and then placing it in an annealing furnace for long-time high-temperature heating. Under the action of high temperature, the anti-oxidation layer on the edge part of the copper foil surface decomposes and diffuses inward from the end of the coil, causing the surface of the copper foil to change color. In the prior art, high-temperature tape is usually used to wrap the end of the coil to reduce the decomposition of the anti-oxidation layer and prevent the diffusion after the decomposition of the anti-oxidation layer. However, due to the limitation of the width of the high-temperature tape and the interference of the coil core, the high-temperature tape needs to be wound around the end of the coil for multiple turns, resulting in gaps between the layers of the high-temperature tape, and further causing the problem that the anti-oxidation layer at the end of the coil still decomposes and diffuses during the annealing process, affecting the production quality of the rolled copper foil. Summary of the Invention

[0003] In view of the above problems, the present invention proposes an annealing method for a copper foil coil that at least partially solves the above problems, aiming to solve the problem that the anti-oxidation layer on the edge part of the copper foil coil is easily damaged during the annealing process in the prior art, and achieve the effect of improving the production quality of the rolled copper foil.

[0004] On the other hand, the present invention also proposes a packaging material for a copper foil coil, which is used to fit and wrap the end of the copper foil coil during the annealing process of the copper foil coil to obtain a coil to be annealed.

[0005] On the other hand, the present invention also proposes a copper foil coil production device, which is used to anneal the copper foil coil to obtain a finished coil.

[0006] Specifically, the present invention provides the following technical solutions:

[0007] An annealing method for a copper foil coil, characterized by comprising:

[0008] Obtaining the packaging material for the copper foil coil; the packaging material includes a copper foil patch made of the same material as the copper foil coil;

[0009] Fitting and wrapping the packaging material around the end of the copper foil coil to obtain a coil to be annealed;

[0010] Annealing the coil to be annealed to obtain a finished coil.

[0011] Optionally, the packaging material further includes high-temperature tape;

[0012] The step of fittingly covering the packaging material around the end of the copper foil coil includes:

[0013] Fittingly covering the copper foil patch around the end of the copper foil coil;

[0014] Winding and pasting at least one turn of the high-temperature tape at the joint between the copper foil patch and the copper foil coil so that the high-temperature tape completely covers the joint.

[0015] Optionally, a process hole is provided at the center of the copper foil patch for fittingly sleeving on the core of the copper foil coil;

[0016] The step of fittingly covering the packaging material around the end of the copper foil coil further includes:

[0017] Passing the copper foil patch through the core via the process hole and fittingly covering it around the end of the copper foil coil;

[0018] Winding and pasting at least one turn of the high-temperature tape at the joint between the process hole and the core so that the high-temperature tape completely covers the joint.

[0019] Optionally, obtaining the packaging material for the copper foil coil includes:

[0020] Using a copper foil coil production device configured to batch manufacture the copper foil patches through a blanking process.

[0021] On the other hand, the present invention also provides a packaging material for a copper foil coil, including a copper foil patch. The copper foil patch includes a disc portion and a flanging portion. The disc portion forms a coaxially arranged process hole for fittingly sleeving on the core of the copper foil coil. There are at least two flanging portions spaced apart around the periphery of the disc portion for bending towards one end of the disc portion to form a sleeve-shaped structure fittingly sleeved on the outer periphery of the copper foil coil. Both the disc portion and the flanging portion are made of copper foil material.

[0022] Optionally, the packaging material further includes a high-temperature tape.

[0023] Optionally, there are six flanging portions, and the six flanging portions are axially and evenly distributed around the periphery of the disc portion along the axis of the process hole. The six flanging portions have the same outer shape.

[0024] On the other hand, the present invention also provides a copper foil coil production device, including a patch manufacturing mechanism. The patch manufacturing mechanism includes a die punch and a die bottom plate arranged opposite to each other. The die punch and the die bottom plate form a punching die cavity in the closed state. The punching die cavity includes a disc forming portion and a flanging forming portion. There are at least two flanging forming portions spaced apart in the circumferential direction of the disc forming portion.

[0025] Optionally, there are six hemming forming parts, and the six hemming forming parts are evenly spaced in the circumferential direction of the disc forming part.

[0026] Optionally, the copper foil coil production device further includes an annealing mechanism. The annealing mechanism includes an annealing chamber for loading the coil to be annealed, and the annealing chamber is connected to an annealing heating device.

[0027] A method for annealing a copper foil coil provided by the present application, by setting a process of covering the end of the copper foil coil with a wrapping material, the wrapping material includes a copper foil patch made of the same material as the copper foil coil, and the wrapping material can fitly cover the end of the coil, realizing a tight seal of the end of the coil, reducing the decomposition of the anti-oxidation layer at the end of the coil during annealing and the diffusion of the decomposed product into the interior of the coil, achieving the effect of improving the production quality of the rolled copper foil finished coil.

[0028] On the other hand, a wrapping material for a copper foil coil proposed by the present invention is provided with a copper foil patch made of the same material as the copper foil coil. Utilizing the high ductility of the copper foil, it can tightly wrap the end face of the coil. And during the annealing process, the thermal expansion and contraction characteristics of the copper foil patch are consistent with those of the copper foil coil, which can avoid the generation of gaps between the wrapping material and the coil due to thermal expansion and contraction during the heating and cooling processes, improving the sealing performance of the wrapping material to the end of the copper foil coil, reducing the decomposition of the anti-oxidation layer at the end of the coil during annealing and the diffusion of the decomposed product into the interior of the coil, reducing or even avoiding the damage of the anti-oxidation layer at the edge part of the copper foil coil during annealing, achieving the effect of improving the production quality of the rolled copper foil finished coil.

[0029] On the other hand, a copper foil coil production device proposed by the present invention is provided with a patch manufacturing mechanism. The patch manufacturing mechanism can batch manufacture copper foil patches through a blanking process, and the produced copper foil patches have high quality and good consistency, improving the sealing performance of the wrapping material to the end of the copper foil coil and also improving the production efficiency of the coil to be annealed.

[0030] According to the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will more clearly understand the above and other objects, advantages and features of the present invention. Description of the Drawings

[0031] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0032] Figure 1 is a flowchart of a method for annealing a copper foil coil according to an embodiment of the present invention;

[0033] Figure 2It is a flowchart of a method for fitting and covering a packaging material at the end of the copper foil coil according to an embodiment of the present invention;

[0034] Figure 3 It is a flowchart of a method for fitting and covering a packaging material at the end of the copper foil coil according to an embodiment of the present invention;

[0035] Figure 4 It is a schematic structural diagram of fitting and covering a packaging material at the end of the copper foil coil according to an embodiment of the present invention;

[0036] Figure 5 It is a schematic structural diagram of a coil to be annealed according to an embodiment of the present invention;

[0037] Figure 6 It is a schematic front view of a copper foil patch according to an embodiment of the present invention;

[0038] Figure 7 It is Figure 6 A schematic enlarged view at position A in

[0039] Figure 8 It is a schematic structural diagram of a patch manufacturing mechanism according to an embodiment of the present invention;

[0040] Figure 9 It is a schematic structural diagram of a die cutting tool and a partial die cutting cavity according to an embodiment of the present invention;

[0041] Figure 10 It is a schematic structural diagram of a die bottom plate and a partial die cutting cavity according to an embodiment of the present invention. Detailed implementation manners

[0042] Next, refer to Figures 1 to 10 to describe the annealing method of the copper foil coil, the packaging material of the copper foil coil, and the copper foil coil production device according to the embodiments of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features, that is, including one or more of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. When a certain feature "includes or contains" a certain or certain features it covers, unless otherwise specifically described, this indicates that other features are not excluded and other features may be further included.

[0043] Unless otherwise clearly specified and defined, terms such as "set", "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. Those of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0044] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. That is, in the description of this embodiment, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", or "underneath" the second feature may be the first feature being directly below or obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0045] In the description of this embodiment, the description referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] Figure 1 is a flowchart of an annealing method for a copper foil coil according to an embodiment of the present invention, and in combination with Figures 2 - 10 , the present invention provides an annealing method for a copper foil coil, including:

[0047] S100 Obtain the packaging material 3 of the copper foil coil 1;

[0048] S200 Fit and wrap the packaging material 3 around the end of the copper foil coil 1 to obtain the coil to be annealed 2;

[0049] S300 Anneal the coil to be annealed 2 to obtain the finished coil.

[0050] Among them, in step S100, the packaging material 3 includes a copper foil patch 31 made of the same material as the copper foil coil 1.

[0051] In the prior art, the packaging material 3 is a high-temperature tape. Due to reasons such as the insufficient width of the high-temperature tape and the unevenness of the end of the coil, gaps are extremely likely to appear at the end of the coil wrapped by the high-temperature tape. As a result, there are still problems of decomposition and diffusion of the anti-oxidation layer at the end of the coil during the annealing process, which affects the production quality of the rolled copper foil. In this embodiment, a copper foil patch 31 made of the same material as the copper foil coil 1 is provided in the packaging material 3, and a process of covering the end of the copper foil coil 1 with the packaging material 3 is set in the annealing process. The packaging material 3 can fitly cover the end of the coil, achieving a tight seal of the end of the coil, reducing the decomposition of the anti-oxidation layer at the end of the coil during the annealing process and the diffusion of the decomposed matter into the coil, and achieving the effect of improving the production quality of the finished coil of the rolled copper foil.

[0052] Specifically, in the annealing process, first, the packaging material 3 including the copper foil patch 31 is obtained through manufacturing or procurement. Then, the packaging material 3 including the copper foil patch 31 is fitly wrapped around the end of the copper foil coil 1, so that the end of the copper foil coil 1 is isolated from the external air, and the coil to be annealed 2 is obtained. Finally, the coil to be annealed 2 is put into an annealing furnace for annealing to obtain a finished coil.

[0053] In this embodiment, taking advantage of the high ductility of the copper foil, which is easy to bend and deform, as Figures 4 - 5 shown, the copper foil patch 31 can tightly wrap the end face of the coil. During the annealing process, the thermal expansion and contraction characteristics of the copper foil patch 31 are the same as those of the copper foil coil 1, which can avoid the generation of gaps between the packaging material 3 and the coil due to thermal expansion and contraction during the heating and cooling processes, and further improve the sealing performance of the packaging material 3 at the end of the copper foil coil 1.

[0054] On the other hand, the copper foil patch 31 can be produced using the copper foil in the copper foil coil 1 as raw material, which is convenient for obtaining materials. Or, the copper foil patch 31 can be produced using the corner waste of the copper foil coil 1 as raw material, which can reduce the production cost of the packaging material 3.

[0055] In some embodiments of the annealing method of the present invention, the packaging material 3 further includes a high-temperature tape. As Figure 2 shown, the process of fitly wrapping the packaging material 3 around the end of the copper foil coil 1 includes:

[0056] S211 Fitly wrap the copper foil patch 31 around the end of the copper foil coil 1;

[0057] S212 Wind and paste at least one turn of the high-temperature tape at the joint between the copper foil patch 31 and the copper foil coil 1 so that the high-temperature tape completely covers the joint.

[0058] In this embodiment, first, the copper foil patch 31 is fitted and wrapped around the end of the copper foil coil 1. Utilizing the high ductility of the copper foil, the copper foil patch 31 is completely wrapped around the end of the copper foil coil 1. After the copper foil patch 31 is fitted and wrapped around the end of the copper foil coil 1, there may be a few small gaps remaining at the joint between the copper foil patch 31 and the copper foil coil 1, which may cause the decomposition of the anti-oxidation layer during the annealing process. Wind and paste at least one turn of high-temperature tape at the joint between the copper foil patch 31 and the copper foil coil 1 to block the possible small gaps and further tightly block the end of the copper foil coil 1. During actual use, according to needs, one turn or multiple turns of high-temperature tape can be wound and pasted. Multiple turns of high-temperature tape can increase the error tolerance and prevent gaps from remaining when the high-temperature tape is pasted at the joint. On the other hand, the high-temperature tape can also further improve the bonding force between the copper foil patch 31 and the copper foil coil 1 and prevent the copper foil patch 31 from falling off the copper foil coil 1.

[0059] In some embodiments of the annealing method of the present invention, a process hole 311 is provided at the center of the copper foil patch 31, as Figures 4 - 5 shown, for fitting and sleeving on the core 11 of the copper foil coil 1.

[0060] The step of fitting and wrapping the packaging material 3 around the end of the copper foil coil 1 further includes:

[0061] S221 Pass the copper foil patch 31 through the core 11 via the process hole 311 and fit and wrap it around the end of the copper foil coil 1;

[0062] S222 Wind and paste at least one turn of high-temperature tape at the joints between the process hole 311 and the core 11 so that the high-temperature tape completely wraps the joints.

[0063] The core 11 is usually longer than the coil. During production, the distances from the ends of the core 11 to the ends of the copper foil coil 1 are usually inconsistent. Therefore, different copper foil coils 1 may require copper foil patches 31 of different specifications. On the other hand, in the annealing process, the two ends of the core 11 are usually placed on a rack to support the coil. If the copper foil patch 31 is wrapped outside the core 11, the packaging material 3 may be squeezed and deformed by the rack, or even cracked, affecting the production quality. In this embodiment, a process hole 311 is provided at the center of the copper foil patch 31. When producing the coil 2 to be annealed, first pass the copper foil patch 31 through the core 11 via the process hole 311, and then fit and wrap it around the end of the copper foil coil 1. In this way, the specification of the copper foil patch 31 only needs to match the outer diameter of the copper foil coil 1, without considering the length of the core 11, which can reduce the area of the copper foil patch 31, reduce the types of specifications of the packaging material 3, improve production efficiency, and reduce production costs. On the other hand, it can also avoid the packaging material 3 being squeezed and deformed by the rack and avoid the packaging material 3 not being tightly wrapped.

[0064] In some embodiments of the annealing method of the present invention, the packaging material 3 for obtaining the copper foil coil 1 includes:

[0065] S111 Use a copper foil coil 1 production device, which is configured to batch manufacture copper foil patches 31 through a blanking process.

[0066] In this embodiment, the copper foil coil 1 production device batch manufactures copper foil patches 31 through a blanking process, which can improve the manufacturing efficiency, improve the quality of the finished packaging material 3, and thus improve the production quality of the cost coil.

[0067] On the other hand, the present invention also proposes a packaging material 3 for the copper foil coil 1, including copper foil patches 31. As Figures 6 - 7 shown, the copper foil patch 31 includes a disc portion 312 and a flanging portion 313. The disc portion 312 forms a process hole 311 arranged coaxially, which is used to fit and sleeve on the core 11 of the copper foil coil 1. There are at least two flanging portions 313, which are spaced apart on the periphery of the disc portion 312, and are used to bend towards one end of the disc portion 312 to form a sleeve-shaped structure that fits and sleeves on the outer periphery of the copper foil coil 1. Both the disc portion 312 and the flanging portion 313 are made of copper foil.

[0068] In this embodiment, the copper foil patch 31 includes a disc portion 312 and a flanging portion 313. The outer diameter of the disc portion 312 is greater than or equal to the outer diameter of the copper foil coil 1, so that when the copper foil patch 31 fits and wraps around the end of the copper foil coil 1, it can completely wrap around the end of the copper foil coil 1. The flanging portion 313 is used to wrap the circumferential surface of the copper foil coil 1 and is in close contact with the circumferential surface of the copper foil coil 1, thereby sealing the end of the copper foil coil 1. The flanging portion 313 is also used to clamp on the circumferential surface of the copper foil coil 1 to form a frictional force between the copper foil patch 31 and the copper foil coil 1, avoiding the copper foil patch 31 from falling off the copper foil coil 1. There are at least two flanging portions 313. The more flanging portions 313 there are, the closer the shape of the disc portion 312 is to a circle.

[0069] In this embodiment, both the disc portion 312 and the flanging portion 313 are made of copper foil. First, the copper foil has good ductility, which is convenient for tightly wrapping the end face of the coil. Second, the thermal expansion and contraction characteristics of the copper foil are the same as those of the copper foil coil 1, which can avoid the generation of gaps between the packaging material 3 and the copper foil coil 1 due to thermal expansion and contraction during the heating and cooling processes, affecting the production quality of the coil. Third, the packaging material 3 can be processed from the raw material of the copper foil coil 1 or the scraps of the copper foil coil 1, which is convenient for obtaining materials and can also reduce production costs.

[0070] In some embodiments of the packaging material 3 for the copper foil coil 1 of the present invention, the packaging material 3 further includes a high-temperature tape.

[0071] In this embodiment, when the copper foil patch 31 is used as the packaging material 3 alone, after the copper foil patch 31 is matched and wrapped around the end of the copper foil roll 1, a few small gaps may remain at the joint between the copper foil patch 31 and the copper foil roll 1, which may cause the anti-oxidation layer to decompose during the annealing process. Wrapping and pasting at least one circle of high-temperature tape at the joint between the copper foil patch 31 and the copper foil roll 1 can block the small gaps that may exist and further tightly block the end of the copper foil roll 1. In actual use, one or more circles of high-temperature tape can be wrapped and pasted as needed. Multiple circles of high-temperature tape can improve the fault tolerance rate and prevent gaps from remaining when the high-temperature tape is pasted at the joint. On the other hand, the high-temperature tape can further improve the bonding force between the copper foil patch 31 and the copper foil roll 1 to prevent the copper foil patch 31 from falling off the copper foil roll 1.

[0072] In some embodiments of the packaging material 3 of the copper foil roll 1 of the present invention, Figure 6 As shown, there are six folding portions 313, and the six folding portions 313 are evenly distributed axially around the disc portion 312 along the axis of the process hole 311. The six folding portions 313 have the same appearance.

[0073] In this embodiment, the disc portion 312 is matched with six folding portions 313 of the same shape and evenly spaced in the axial direction, which is easy to process and produce. When the length of the folding portions 313 remains unchanged, the more folding portions 313 there are, the more overlapping parts of adjacent folding portions 313 will be when wrapping the end of the cylindrical roll, which is easy to cause material waste. If the number of folding portions 313 is too small, it is easy to wrap loosely, affecting the production quality of the roll. The regular hexagon is the best result of combining the above two aspects.

[0074] In some embodiments of the packaging material 3 of the copper foil roll 1 of the present invention, Figures 6 - 7 As shown, the folded edge portion 313 is a rectangle, and one side of the rectangle is fixedly connected to the corresponding side of the disk portion 312. One end point of the side connecting the rectangle and the disk portion 312 coincides with one end point of the corresponding side of the disk portion 312, the length of the side connecting the rectangle and the disk portion 312 is greater than the length of the corresponding side of the disk portion 312, and a chamfer is provided on the extended portion. In other words, except for the end points of the corresponding sides of the disk portion 312, there is no connection or overlap between two adjacent folded edge portions 313. With such a configuration, on the one hand, the copper foil patch 31 can be directly punched out of a sheet material. On the other hand, when the copper foil patch 31 is wrapped around the end of the copper foil roll 1, two adjacent folded edge portions 313 have overlapping portions, such as Figure 5 As shown, the copper foil patch 31 can be formed into a sleeve-shaped structure without leaving any gaps, thereby improving the sealing performance of the packaging material 3.

[0075] On the other hand, the present invention also provides a copper foil roll 1 production device, including a patch manufacturing mechanism 4. Figures 8 - 10As shown, the patch manufacturing mechanism 4 includes a die punch 41 and a die bottom plate 42 which are oppositely arranged. The die punch 41 and the die bottom plate 42 form a punching die cavity in the closed state. The punching die cavity includes a disc forming part 43 and a flanging forming part 44. There are at least two flanging forming parts 44 which are arranged at intervals in the circumferential direction of the disc forming part 43.

[0076] In this embodiment, the patch manufacturing mechanism 4 can batch manufacture the copper foil patch 31 through a blanking process. Among them, the disc forming part 43 is used to manufacture the process hole 311 at the center of the disc part 312, and the flanging forming part 44 is used to manufacture the flanging part 313. The copper foil patch 31 produced by the patch manufacturing mechanism 4 has high quality and good consistency, improving the sealing performance of the packaging material 3 to the end of the copper foil coil 1, and also improving the production efficiency of the coil 2 to be annealed.

[0077] In some embodiments of the copper foil coil 1 production device of the present invention, such as Figures 8 - 10 shown, there are six flanging forming parts 44, and the six flanging forming parts 44 are evenly spaced in the circumferential direction of the disc forming part 43.

[0078] In this embodiment, the six flanging forming parts 44 are evenly spaced in the circumferential direction of the disc forming part 43, which can reduce the manufacturing difficulty of the flanging forming part 44 and reduce the die-making cost. On the other hand, the six flanging forming parts 44 can reduce the corner waste when the plate is processed into the finished copper foil patch 31, reduce material waste, and reduce production costs.

[0079] In some embodiments of the copper foil coil 1 production device of the present invention, the copper foil coil 1 production device further includes an annealing mechanism. The annealing mechanism includes an annealing cavity for loading the coil 2 to be annealed, and the annealing cavity is connected to an annealing heating device.

[0080] So far, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention. Therefore, the scope of the present invention should be understood and determined to cover all these other variations or modifications.

Claims

1. An annealing method for a copper foil coil, characterized in that, Including: Obtaining the packaging material for the copper foil coil; The packaging material includes a copper foil patch made of the same material as the copper foil coil; wherein, the copper foil patch includes: a disc portion, the disc portion forms a process hole coaxially arranged with the core of the copper foil coil, and is used for fitting and sleeving on the core of the copper foil coil; a flanging portion, there are six flanging portions, and the six flanging portions are axially and uniformly distributed around the periphery of the disc portion along the axis of the process hole, and are used for bending towards one end of the disc portion to form a sleeve-shaped structure that fits and sleeves on the outer periphery of the copper foil coil. The flanging portion is rectangular, one side of the rectangle is fixedly connected to the corresponding side of the disc portion, one end point of the side of the rectangle connected to the disc portion coincides with one end point of the corresponding side of the disc portion, and the length of the side of the rectangle connected to the disc portion is greater than the length of the corresponding side of the disc portion; both the disc portion and the flanging portion are made of copper foil material, and the copper foil patch is blanked and processed from a sheet material; Fittingly covering the packaging material on the end of the copper foil coil to obtain a coil to be annealed; Annealing the coil to be annealed to obtain a finished coil.

2. The annealing method according to claim 1, characterized in that, The packaging material further includes a high-temperature tape; The fittingly covering the packaging material on the end of the copper foil coil includes: Fittingly covering the copper foil patch on the end of the copper foil coil; Winding and pasting at least one turn of the high-temperature tape at the joint between the copper foil patch and the copper foil coil so that the high-temperature tape completely covers the joint.

3. The annealing method according to claim 2, characterized in that, A process hole is provided at the center of the copper foil patch for fitting and sleeving on the core of the copper foil coil; The fittingly covering the packaging material on the end of the copper foil coil further includes: Passing the copper foil patch through the core through the process hole and fittingly covering it on the end of the copper foil coil; Winding and pasting at least one turn of the high-temperature tape at the joint between the process hole and the core so that the high-temperature tape completely covers the joint.

4. The annealing method according to claim 1, characterized in that, The obtaining of the packaging material for the copper foil coil includes: Using a copper foil coil production device, and the copper foil coil production device batch manufactures the copper foil patch through a blanking process.

5. A packaging material for a copper foil coil, characterized in that, Including a copper foil patch; the copper foil patch includes: A disc portion, the disc portion forms a process hole coaxially arranged with the core of the copper foil coil, and is used for fitting and sleeving on the core of the copper foil coil; A flanging portion, there are six flanging portions, and the six flanging portions are axially and uniformly distributed around the periphery of the disc portion along the axis of the process hole, and are used for bending towards one end of the disc portion to form a sleeve-shaped structure that fits and sleeves on the outer periphery of the copper foil coil. The flanging portion is rectangular, one side of the rectangle is fixedly connected to the corresponding side of the disc portion, one end point of the side of the rectangle connected to the disc portion coincides with one end point of the corresponding side of the disc portion, and the length of the side of the rectangle connected to the disc portion is greater than the length of the corresponding side of the disc portion; and Both the disc portion and the flanging portion are made of copper foil material, and the copper foil patch is blanked and processed from a sheet material.

6. The packaging material according to claim 5, wherein The packaging material further includes a high-temperature tape.

7. According to the packaging material of claim 5, characterized in that, The outer shapes of the six hemming portions are all the same.

8. A copper foil coil production device, characterized in that, It includes: A patch manufacturing mechanism, the patch manufacturing mechanism includes a die punching knife and a die bottom plate arranged oppositely, the die punching knife and the die bottom plate form a punching die cavity in a closed state, the punching die cavity includes a disc forming portion and a hemming forming portion, there are six hemming forming portions, and the six hemming forming portions are evenly spaced in the circumferential direction of the disc forming portion; The patch manufacturing mechanism batch manufactures copper foil patches through a blanking process. The copper foil patches include: a disc portion, the disc portion forms a process hole coaxially arranged with the core of the copper foil coil, and is used for fittingly sleeving on the core of the copper foil coil; a hemming portion, there are six hemming portions, and the six hemming portions are axially evenly distributed around the periphery of the disc portion along the axis of the process hole, and are used for bending towards one end of the disc portion to form a sleeve-shaped structure fittingly sleeved on the outer periphery of the copper foil coil. The hemming portion is rectangular, one side of the rectangle is fixedly connected to the corresponding side of the disc portion, one end point of the side of the rectangle connected to the disc portion coincides with one end point of the corresponding side of the disc portion, and the length of the side of the rectangle connected to the disc portion is greater than the length of the corresponding side of the disc portion.

9. The copper foil coil production device according to claim 8, characterized in that, The copper foil coil production device further includes: An annealing mechanism, the annealing mechanism includes an annealing cavity for loading the coil to be annealed, and the annealing cavity is connected to an annealing heating device.

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