Electrode winding core

Abstract

The present invention relates to an electrode winding core for winding an electrode, characterized in that it includes a ring-shaped first core having a first outer diameter, a ring-shaped second core having a second inner diameter larger than the first outer diameter, and a connecting member connecting the first core and the second core.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0159440, filed November 16, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an electrode winding core, and more particularly to an electrode winding core that can be attached to slitters of different sizes. [Background technology]

[0003] As technological development and demand for mobile devices continues to grow, rechargeable secondary batteries are being used as energy sources for various mobile devices. Secondary batteries are also attracting attention as energy sources for electric vehicles and hybrid electric vehicles, which are being proposed as alternatives to existing gasoline-powered vehicles and diesel-powered vehicles that use fossil fuels.

[0004] Depending on the shape of the battery case, secondary batteries are classified into cylindrical batteries and prismatic batteries, in which the electrode assembly is housed in a cylindrical or prismatic metal can, and pouch batteries, in which the electrode assembly is housed in a pouch-shaped case made of an aluminum laminate sheet.

[0005] FIG. 1 is a diagram illustrating a state in which an electrode according to the prior art is wound around a core.

[0006] Referring to FIG. 1, a core 1 having a through hole in the center and an approximately cylindrical outer shape is fastened to a rotatable winding shaft (not shown), and as the core 1 rotates, an electrode 2 is wound around the outer surface of the core 1.

[0007] That is, since the diameter of the central through hole of the core 1 must be substantially the same as the outer diameter of the winding shaft, a new core must be used when the diameter of the winding shaft is changed.

[0008] Meanwhile, the electrode manufacturing process involves a slittering process in which the electrode is cut to fit the battery specifications, and after the slittering process, a slitter core is required to wind the electrode.

[0009] However, as mentioned above, when the outer diameter of the rotating shaft is changed, the inner diameter of the slitter core must also be changed accordingly. In particular, if an electrode has already been wound on the core, it is very difficult to process the electrode wound on the core unless the shaft itself is replaced. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent Publication No. 10-2018-0028469 Summary of the Invention [Problem to be solved by the invention]

[0011] In order to solve the above problems, an object of the present invention is to provide an electrode winding core that can be attached to a rotating shaft or a slitter having different diameters. [Means for solving the problem]

[0012] As a technical means for achieving the above-mentioned object, an electrode winding core for winding an electrode according to one embodiment of the present invention is characterized by including a ring-shaped first core (100) having a first outer diameter (D1), a ring-shaped second core (200) having a second inner diameter (D4) larger than the first outer diameter (D1), and a connecting member (300) connecting the first core (100) and the second core (200).

[0013] In addition, in an electrode winding core according to one embodiment of the present invention, the first core (100) is formed to have a first hole (110) having a first inner diameter D2 smaller than the first outer diameter (D1), and the second core (200) is formed to have a second hole (210) having the second inner diameter (D4).

[0014] In addition, in the electrode winding core according to one embodiment of the present invention, the first core (100) is disposed in the second hole (210) so as to be located inside the second core (200).

[0015] In addition, in the electrode winding core according to one embodiment of the present invention, the first core (100) and the second core (200) are separable by the connecting member (300).

[0016] In addition, in an electrode winding core according to one embodiment of the present invention, the connecting member (300) is characterized by including a first connecting member (310) that connects one surface of the first core (100) to one surface of the second core (200), and a second connecting member (320) that connects the other surface of the first core (100) to the other surface of the second core (200).

[0017] In addition, in the electrode winding core according to one embodiment of the present invention, the first connecting member (310) and the second connecting member (320) are formed so as not to overlap with the first hole (110).

[0018] In addition, in the electrode winding core according to one embodiment of the present invention, the inner diameter of the first connecting member (310) corresponds to the first inner diameter (D2), and the outer diameter of the first connecting member (310) corresponds to the second outer diameter (D3) of the second core.

[0019] In addition, in the electrode winding core according to one embodiment of the present invention, the inner diameter of the second connecting member (320) corresponds to the first inner diameter (D2), and the outer diameter of the second connecting member (320) is formed to correspond to the second outer diameter (D3) of the second core.

[0020] In addition, in the electrode winding core according to one embodiment of the present invention, a first fastening hole (120) is formed on one side of the first core (100), a second fastening hole (220) is formed on one side of the second core (200), a third inner fastening hole (312a) is formed in the first connecting member (310) at a position corresponding to the first fastening hole (120), and a third outer fastening hole (312b) is formed in the first connecting member (310) at a position corresponding to the second fastening hole (220).

[0021] In addition, in the electrode winding core according to one embodiment of the present invention, the first fastening hole (120) and the third inner fastening hole (312a), and the second fastening hole (220) and the third outer fastening hole (312b) are coupled via a fastening unit (400).

[0022] In addition, in the electrode winding core according to one embodiment of the present invention, a first fastening hole (120) is formed on the other side of the first core (100), a second fastening hole (220) is formed on the other side of the second core (200), a fourth inner fastening hole (322a) is formed in the second connecting member (320) at a position corresponding to the first fastening hole (120), and a fourth outer fastening hole (322b) is formed in the second connecting member (320) at a position corresponding to the second fastening hole (220).

[0023] In addition, in the electrode winding core according to one embodiment of the present invention, the first fastening hole (120) and the fourth inner fastening hole (322a), and the second fastening hole (220) and the fourth outer fastening hole (322b) are connected via a fastening unit (400). [Effects of the Invention]

[0024] As described above, the electrode winding core according to the present invention has a first core and a second core, which have different inner and outer diameters, detachably connected via a connecting member, and can therefore be attached to a large number of shafts and slitters with different outer diameters.

[0025] In addition, according to the electrode winding core of the present invention, the electrode wound on the second core can be attached to a shaft or slitter that uses the first core, so there is no need to provide a separate shaft or slitter for the second core, thereby reducing the capital investment costs required for electrode production. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 10 is a diagram illustrating a state in which an electrode according to the prior art is wound around a core. [Figure 2] 1 is a perspective view illustrating an electrode winding core according to an embodiment of the present invention. [Figure 3] 1 is an exploded perspective view illustrating an electrode winding core according to an embodiment of the present invention. [Figure 4] 2 is a cross-sectional view illustrating a first core of an electrode winding core according to an embodiment of the present invention. FIG. [Figure 5] FIG. 3 is a cross-sectional view illustrating a second core of an electrode winding core according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, with reference to the accompanying drawings, a detailed description will be given of an embodiment of the present invention that will enable a person skilled in the art to easily carry out the present invention. However, in describing the operation principle of the preferred embodiment of the present invention in detail, if it is determined that a detailed description of related well-known functions or configurations may unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0028] Furthermore, the same reference numerals are used throughout the drawings for parts having similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only a direct connection but also an indirect connection via another element therebetween. Furthermore, unless otherwise specified, "including a certain element" does not mean that other elements are excluded, but that other elements may also be included.

[0029] The electrode winding core according to the present invention will be described below. The electrode winding core can be configured to wind an electrode.

[0030] Fig. 2 is a perspective view illustrating an electrode winding core according to an embodiment of the present invention, Fig. 3 is an exploded perspective view illustrating an electrode winding core according to an embodiment of the present invention, Fig. 4 is a cross-sectional view illustrating a first core of the electrode winding core according to an embodiment of the present invention, and Fig. 5 is a cross-sectional view illustrating a second core of the electrode winding core according to an embodiment of the present invention.

[0031] 2 to 5, the electrode winding core according to the present invention includes a first core 100, a second core 200, a connecting member 300, and a fastening unit 400. As shown in FIG.

[0032] The first core 100 may be formed to have a ring shape with a first outer diameter D1 and a first hole 110 with a first inner diameter D2 that is smaller than the first outer diameter D1.

[0033] The second core 200 may be ring-shaped and have a second inner diameter D4 larger than the first outer diameter D1 of the first core 100, and may be formed to have a second hole 210 having the second inner diameter D4.

[0034] Therefore, the first inner diameter D2 of the first core 100 is the smallest, followed by the first outer diameter D1, the second inner diameter D4 of the second core 200, and the second outer diameter D3 in that order.

[0035] For example, the first outer diameter D1 of the first core 100 may be 3 inches (7.62 cm) and the second outer diameter D3 of the second core 200 may be 6 inches (15.24 cm), but is not necessarily limited to this.

[0036] Also, the first core 100 may be disposed in the second hole 210 so as to be located inside the second core 200. For example, the first core 100 may be disposed so that the center of the second core 200 and the center of the first core 100 coincide with each other.

[0037] First fastening holes 120 may be formed on one surface and the other surface of the first core 100. Here, the first fastening holes 120 may have female threads formed therein.

[0038] In addition, second fastening holes 220 may be formed on one and the other surfaces of the second core 200, and the second fastening holes 220 may be formed with female threads.

[0039] Next, the connecting member 300 is for connecting the first core 100 and the second core 200 and may include a first connecting member 310 and a second connecting member 320 .

[0040] First, the first connecting member 310 connects one side of the first core 100 and one side of the second core 200, and is a circular plate of a certain thickness that is cut into an approximately "U" shape including the center and has a number of third holes 311 formed therein.

[0041] Here, the third hole 311 may be configured so that an operator can easily hold the first connecting member 310 with his / her hands and place the first connecting member 310 on one surface of the first core 100 and one surface of the second core 200 .

[0042] In addition, the first connecting member 310 may have a third inner fastening hole 312a formed at a position corresponding to the first fastening hole 120, and a third outer fastening hole 312b formed at a position corresponding to the second fastening hole 220.

[0043] The first fastening hole 120 and the third inner fastening hole 312 a , and the second fastening hole 220 and the third outer fastening hole 312 b can be coupled together via a fastening unit 400 .

[0044] The first connecting member 310 is cut into a substantially "U" shape including the center, thereby reducing the number of third inner fastening holes 312a and third outer fastening holes 312b, and shortening the time required to connect the first core 100 and the second core 200 compared to when the first connecting member 310 is configured in a disk shape. In addition, such a "U"-shaped first connecting member 310 can stably connect the first core 100 and the second core 200.

[0045] In addition, for example, the fastening unit 400 may be configured as a screw unit having a male thread portion, so that the first fastening hole 120 and the third inner fastening hole 312a, and the second fastening hole 220 and the third outer fastening hole 312b can be screwed together via the fastening unit 400.

[0046] In other words, the fastening unit 400 passes through the third inner fastening hole 312a and the first fastening hole 120 simultaneously to be coupled to the first fastening hole 120, thereby fixing one surface of the first core 100 to the first connecting member 310. Also, the fastening unit 400 passes through the third outer fastening hole 312b and the second fastening hole 220 simultaneously to be coupled to the second fastening hole 220, thereby fixing one surface of the second core 200 to the first connecting member 310.

[0047] Here, it is preferable that the first connection member 310 does not overlap the first hole 110 .

[0048] More specifically, the inner diameter of the circle corresponding to the center of the "U"-shaped incision in the first connecting member 310 can be formed to correspond to the first inner diameter D2 of the first core 100, and the outer diameter of the first connecting member 310 can be formed to correspond to the second outer diameter D3 of the second core 200.

[0049] Here, the meaning that the inner diameter of the first connecting member 310 corresponds to the first inner diameter D2 and the meaning that the outer diameter of the first connecting member 310 corresponds to the second outer diameter D3 are the same, and may be a size that includes errors that occur due to work or construction.

[0050] On the other hand, the second connecting member 320 connects the other side of the first core 100 and the other side of the second core 200, and is a circular plate of a certain thickness that is cut into an approximately "U" shape including the center and has a number of fourth holes 321 formed therein.

[0051] Here, the fourth hole 321 can be configured so that an operator can easily grip the second connecting member 320 with his / her hand and place the second connecting member 320 against the other surface of the first core 100 and the other surface of the second core 200.

[0052] In addition, the second connecting member 320 may have a fourth inner fastening hole 322a formed at a position corresponding to the first fastening hole 120, and a fourth outer fastening hole 322b formed at a position corresponding to the second fastening hole 220.

[0053] The first fastening hole 120 and the fourth inner fastening hole 322a, and the second fastening hole 220 and the fourth outer fastening hole 322b can be coupled together via a fastening unit 400.

[0054] The second connecting member 320 is cut into a substantially U-shape including the center, thereby reducing the number of fourth inner fastening holes 322a and fourth outer fastening holes 322b, thereby shortening the time required to connect the first core 100 and the second core 200 compared to when the second connecting member 320 is configured in a disk shape. In addition, the U-shaped second connecting member 320 can stably connect the first core 100 and the second core 200.

[0055] In addition, for example, the fastening unit 400 may be configured as a screw unit having a male thread portion, so that the first fastening hole 120 and the fourth inner fastening hole 322a, and the second fastening hole 220 and the fourth outer fastening hole 322b can be screwed together via the fastening unit 400.

[0056] In other words, the fastening unit 400 passes through the fourth inner fastening hole 322a and the first fastening hole 120 simultaneously to be coupled to the first fastening hole 120, thereby fixing the other surface of the first core 100 to the second connecting member 320. In addition, the fastening unit 400 passes through the fourth outer fastening hole 322b and the second fastening hole 220 simultaneously to be coupled to the second fastening hole 220, thereby fixing the other surface of the second core 200 to the second connecting member 320.

[0057] Here, it is preferable that the second connection member 320 does not overlap with the first hole 110 .

[0058] More specifically, the inner diameter of the circle corresponding to the center of the "U"-shaped incision in the second connecting member 320 can be formed to correspond to the first inner diameter D2 of the first core 100, and the outer diameter of the second connecting member 320 can be formed to correspond to the second outer diameter D3 of the second core 200.

[0059] Here, the meaning that the inner diameter of the second connecting member 320 corresponds to the first inner diameter D2 and the meaning that the outer diameter of the second connecting member 320 corresponds to the second outer diameter D3 are the same, and may be a size that includes errors that occur due to work or construction.

[0060] The electrode winding core according to one embodiment of the present invention includes a connecting member 300 that connects the first core 100 and the second core 200, so that the electrode wound around the second core 200 can be mounted on a slitter that uses only the first core 100. For example, the electrode winding core can be mounted on the bobbin of the slitter.

[0061] In addition, since the first core 100 and the second core 200 can be separated by the connecting member 300 and the fastening unit 400, the first core 100 and the second core 200 can be used independently.

[0062] For example, the first core 100 and the second core 200 can be separated by removing the fastening unit 400 to release the connection with the connecting member 300.

[0063] Therefore, the first core 100 can be mounted on a slitter or shaft having a size corresponding to the first inner diameter D2 and then wind an electrode thereon, and the second core 200 can be mounted on a slitter or shaft having a size corresponding to the second inner diameter D4 and then wind an electrode thereon.

[0064] Meanwhile, the material for forming the first core 100, the second core 200 and the connecting member 300 may be aluminum, but is not limited thereto and may be other metal materials.

[0065] The electrode wound around the core may be a positive electrode or a negative electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material coated on the upper and / or lower surfaces of the positive electrode current collector to form a ground portion. The positive electrode active material may be mixed with a conductive material and a binder, and a filler may also be added as needed.

[0066] The negative electrode includes a negative electrode current collector and a negative electrode active material that is applied to the upper and / or lower surfaces of the negative electrode current collector to form a ground portion. The negative electrode active material may further contain a conductive material, a binder, and, if necessary, a filler.

[0067] These positive and negative electrodes correspond to known technologies, and therefore detailed description thereof will be omitted.

[0068] Although specific portions of the contents of the present invention have been described in detail above, it will be apparent to those skilled in the art that such specific techniques are merely preferred embodiments and do not limit the scope of the present invention. It is obvious to those skilled in the art that various changes and modifications are possible within the scope and technical idea of ​​the present invention, and it goes without saying that such changes and modifications also fall within the scope of the accompanying claims. [Explanation of symbols]

[0069] 100 First Core 110 Hole 1 120 First Closing Hole 200 Second Core 210 2nd Hole 220 2nd Closing Hole 300 Connecting member 310 First connecting member 311 3rd Hall 312 3rd Concluding Hole 312a Third inner fastening hole 312b Third outer fastening hole 320 Second connecting member 321 4th hole 322 4th Closing Hole 322a 4th inner fastening hole 322b 4th outer fastening hole 400 Fastening Units D1 1st outer diameter D2 1st inner diameter D3 Second outer diameter D4 Second inner diameter

Claims

1. An electrode winding core for winding an electrode, a ring-shaped first core having a first outer diameter; a ring-shaped second core having a second inner diameter larger than the first outer diameter; a connecting member that connects the first core and the second core.

2. the first core is formed to have a first hole having a first inner diameter smaller than the first outer diameter, The electrode winding core according to claim 1 , wherein the second core is formed to have a second hole having the second inner diameter.

3. The electrode winding core according to claim 2 , wherein the first core is disposed in the second hole so as to be located inside the second core.

4. The electrode winding core according to claim 1 , wherein the first core and the second core are separable by the connecting member.

5. The connecting member is a first connecting member that connects one surface of the first core and one surface of the second core; The electrode winding core according to claim 2 , further comprising: a second connecting member connecting the other surface of the first core and the other surface of the second core.

6. The electrode winding core according to claim 5 , wherein the first and second connecting members are formed so as not to overlap with the first holes.

7. an inner diameter of the first connecting member corresponds to the first inner diameter; The electrode winding core according to claim 6 , wherein the outer diameter of the first connecting member is formed to correspond to the second outer diameter of the second core.

8. an inner diameter of the second connecting member corresponds to the first inner diameter; The electrode winding core according to claim 6 , wherein the second connecting member has an outer diameter corresponding to the second outer diameter of the second core.

9. A first fastening hole is formed on one surface of the first core, A second fastening hole is formed on one surface of the second core, 6. The electrode winding core according to claim 5, wherein the first connecting member has a third inner fastening hole formed at a position corresponding to the first fastening hole, and a third outer fastening hole formed at a position corresponding to the second fastening hole.

10. The electrode winding core according to claim 9 , wherein the first fastening hole and the third inner fastening hole, and the second fastening hole and the third outer fastening hole are coupled together via a fastening unit.

11. A first fastening hole is formed on the other surface of the first core, A second fastening hole is formed on the other surface of the second core, 6. The electrode winding core according to claim 5, wherein the second connecting member has a fourth inner fastening hole formed at a position corresponding to the first fastening hole, and a fourth outer fastening hole formed at a position corresponding to the second fastening hole.

12. The electrode winding core according to claim 11 , wherein the first fastening hole and the fourth inner fastening hole, and the second fastening hole and the fourth outer fastening hole are coupled together via a fastening unit.

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