Core for winding electrode

Abstract

The present invention relates to an electrode winding core for winding an electrode, comprising: a first core in the form of a ring having a first outer diameter; a second core in the form of a ring having a second inner diameter larger than the first outer diameter; and a connection member connecting the first core and the second core.

Description

Core for electrode winding

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

[0002] The present invention relates to a core for winding an electrode, and more particularly, to a core for winding an electrode that can be mounted on slitters of different sizes.

[0003]

[0004] As technological development and demand for mobile devices increase, rechargeable secondary batteries are increasingly being used as energy sources for a variety of mobile devices. Secondary batteries are also attracting attention as an energy source for electric and hybrid electric vehicles, offering an alternative to conventional gasoline and diesel vehicles that rely on fossil fuels.

[0005] Secondary batteries are classified into cylindrical and prismatic batteries, in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet, depending on the shape of the battery case.

[0006] Figure 1 is a drawing for explaining a state in which an electrode according to a conventional technology is wound around a core.

[0007] Referring to Fig. 1, a core (1) having a through hole formed in the center and an outer diameter having a roughly cylindrical shape is fastened to a rotatable winding shaft (not shown), and as the core (1) rotates, an electrode (2) is wound on the outer surface of the core (1).

[0008] 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.

[0009] Meanwhile, during the electrode manufacturing process, a so-called slitting process is performed to cut the electrode to fit the battery specifications, and after the slitting process, a slitter core is required to rewind the electrode.

[0010] However, as previously mentioned, if the outer diameter of the rotating shaft changes, the inner diameter of the slitter core must also change accordingly. In particular, if the electrode has already been wound around the core, it is extremely difficult to process the electrode wound around the core without replacing the shaft itself.

[0011]

[0012] (Prior art literature)

[0013] (Patent Document 1) Korean Patent Publication No. 10-2018-0028469

[0014]

[0015] In order to solve the above problems, the present invention aims to provide an electrode winding core that can be mounted even when the diameters of the rotating shaft or slitter are different.

[0016]

[0017] As a technical means for achieving the above purpose, an electrode winding core for winding an electrode according to one embodiment of the present invention is characterized by including a first core (100) in a ring shape having a first outer diameter (D1); a second core (200) in a ring shape 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).

[0018] In addition, in the 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 a second inner diameter (D4).

[0019] In addition, in the electrode winding core according to one embodiment of the present invention, the first core (100) is characterized in that it is arranged in the second hole (210) so as to be provided on the inner side of the second core (200).

[0020] 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 characterized in that they are separable by the connecting member (300).

[0021] In addition, in the electrode winding core according to one embodiment of the present invention, the connecting member (300) is characterized by including a first connecting member (310) connecting one surface of the first core (100) and one surface of the second core (200); and a second connecting member (320) connecting the other surface of the first core (100) and the other surface of the second core (200).

[0022] 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).

[0023] 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).

[0024] 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) corresponds to the second outer diameter (D3).

[0025] In addition, in the electrode winding core according to one embodiment of the present invention, a first fastening hole (120) is formed on one surface of the first core (100), a second fastening hole (220) is formed on one surface 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 at a position corresponding to the second fastening hole (220).

[0026] 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 characterized in that they are joined by a fastening unit (400).

[0027] 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 surface of the first core (100), a second fastening hole (220) is formed on the other surface 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 at a position corresponding to the second fastening hole (220).

[0028] 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 characterized in that they are joined by a fastening unit (400).

[0029]

[0030] As described above, according to the electrode winding core according to the present invention, the first core and the second core having different inner and outer diameters are detachably connected through a connecting member, so that the core can be mounted on a plurality of shafts or slitters having different outer diameters.

[0031] In addition, according to the electrode winding core according to the present invention, since the electrode wound on the second core can be mounted on a shaft or slitter using the first core, there is no need to separately provide a shaft or slitter for the second core, and thus the equipment investment cost required for electrode production can be saved.

[0032]

[0033] Figure 1 is a drawing for explaining a state in which an electrode according to a conventional technology is wound around a core.

[0034] Fig. 2 is a perspective view illustrating a core for winding an electrode according to one embodiment of the present invention.

[0035] Figure 3 is an exploded perspective view illustrating an electrode winding core according to one embodiment of the present invention.

[0036] Fig. 4 is a cross-sectional view illustrating a first core of an electrode winding core according to one embodiment of the present invention.

[0037] Fig. 5 is a cross-sectional view illustrating a second core of an electrode winding core according to one embodiment of the present invention.

[0038]

[0039] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0040] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0041]

[0042] Hereinafter, an electrode winding core according to the present invention is described. The electrode winding core can be provided for winding an electrode.

[0043] Fig. 2 is a perspective view illustrating an electrode winding core according to one embodiment of the present invention, and Fig. 3 is an exploded perspective view illustrating an electrode winding core according to one embodiment of the present invention. In addition, Fig. 4 is a cross-sectional view illustrating a first core of an electrode winding core according to one embodiment of the present invention, and Fig. 5 is a cross-sectional view illustrating a second core of an electrode winding core according to one embodiment of the present invention.

[0044] Referring to FIGS. 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).

[0045] The first core (100) has a ring shape with a first outer diameter (D1) and can be formed to have a first hole (110) with a first inner diameter (D2) smaller than the first outer diameter (D1).

[0046] The second core (200) has a ring shape with a second inner diameter (D4) larger than the first outer diameter (D1) of the first core (100), and can be formed to have a second hole (210) with the second inner diameter (D4).

[0047] Therefore, the first inner diameter (D2) of the first core (100) is the smallest, and the first outer diameter (D1), the second inner diameter (D4) of the second core (200), and the second outer diameter (D3) increase in that order.

[0048] For example, the first outer diameter (D1) of the first core (100) may be 3 inches, and the second outer diameter (D3) of the second core (200) may be 6 inches, but is not necessarily limited thereto.

[0049] Additionally, the first core (100) may be placed in the second hole (210) so as to be provided on the inner side of the second core (200). For example, the first core (100) may be placed so that the center of the second core (200) and the center of the first core (100) coincide with each other.

[0050] A first fastening hole (120) may be formed on one side and the other side of the first core (100), and at this time, a female screw thread may be formed in the first fastening hole (120).

[0051] Additionally, a second fastening hole (220) may be formed on one side and the other side of the second core (200), and a female screw thread may be formed in the second fastening hole (220).

[0052]

[0053] Continuing, 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).

[0054] First, the first connecting member (310) connects one side of the first core (100) and one side of the second core (200). It is a circular plate having a certain thickness and having a cut in a roughly 'U' shape including the center and having a plurality of third holes (311) formed therein.

[0055] Here, the third hole (311) may be provided so that the worker can easily place the first connecting member (310) on one side of the first core (100) and one side of the second core (200) by holding it by hand.

[0056] In addition, a third inner fastening hole (312a) may be formed in the first connecting member (310) at a position corresponding to the first fastening hole (120), and a third outer fastening hole (312b) may be formed at a position corresponding to the second fastening hole (220).

[0057] And these 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 joined by a fastening unit (400).

[0058] The first connecting member (310) is cut in a roughly 'U' shape including the center, so that the number of third inner fastening holes (312a) and third outer fastening holes (312b) is small, thereby shortening the connection time between the first core (100) and the second core (200) compared to when the first connecting member (310) is provided as a circular plate. In addition, the 'U'-shaped first connecting member (310) can ensure that the first core (100) and the second core (200) are stably connected.

[0059] Additionally, for example, the fastening unit (400) may be provided as a screw unit having a male screw thread, and accordingly, the first fastening hole (120) and the third inner fastening hole (312a), the second fastening hole (220) and the third outer fastening hole (312b) may be screw-connected by the fastening unit (400).

[0060] In other words, the fastening unit (400) passes through the third inner fastening hole (312a) and the first fastening hole (120) simultaneously and is coupled with the first fastening hole (120), thereby fixing one surface of the first core (100) and the first connecting member (310). In addition, the fastening unit (400) passes through the third outer fastening hole (312b) and the second fastening hole (220) simultaneously and is coupled with the second fastening hole (220), thereby fixing one surface of the second core (200) and the first connecting member (310).

[0061] At this time, it is preferable that the first connecting member (310) does not overlap the first hole (320).

[0062] To explain in more detail, the inner diameter of the circle corresponding to the center of the 'U' shaped cutout in the first connecting member (310) may correspond to the first inner diameter (D2) of the first core (100), and the outer diameter of the first connecting member (310) may correspond to the second outer diameter (D3) of the second core (200).

[0063] 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) may be the same, but may be a size that includes an error caused by work or construction.

[0064]

[0065] Meanwhile, the second connecting member (320) connects the other surface of the first core (100) and the other surface of the second core (200), and is a circular plate having a certain thickness that is cut in a roughly 'U' shape including the center and has a plurality of fourth holes (312) formed therein.

[0066] Here, the fourth hole (312) may be provided so that the worker can easily place the second connecting member (320) on the other side of the first core (100) and the other side of the second core (200) by holding it by hand.

[0067] In addition, a fourth inner fastening hole (322a) may be formed in the second connecting member (320) at a position corresponding to the first fastening hole (120), and a fourth outer fastening hole (322b) may be formed at a position corresponding to the second fastening hole (220).

[0068] And these 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 joined by a fastening unit (400).

[0069] The second connecting member (320) is cut in a roughly 'U' shape including the center, so that the number of fourth inner fastening holes (322a) and fourth outer fastening holes (322b) is small, thereby shortening the connection time between the first core (100) and the second core (200) compared to when the second connecting member (320) is provided as a circular plate. In addition, this 'U'-shaped second connecting member (320) can ensure that the first core (100) and the second core (200) are stably connected.

[0070] Additionally, for example, the fastening unit (400) may be provided as a screw unit having a male screw thread, and accordingly, the first fastening hole (120) and the fourth inner fastening hole (322a), the second fastening hole (220) and the fourth outer fastening hole (322b) may be screw-connected by the fastening unit (400).

[0071] In other words, the fastening unit (400) passes through the fourth inner fastening hole (322a) and the first fastening hole (120) simultaneously and is coupled with the first fastening hole (120), thereby fixing the other surface of the first core (100) and 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 and is coupled with the second fastening hole (220), thereby fixing the other surface of the second core (200) and the second connecting member (320).

[0072] At this time, it is preferable that the second connecting member (320) does not overlap with the first hole (320).

[0073] To explain in more detail, the inner diameter of the circle corresponding to the center of the 'U' shaped cutout in the second connecting member (320) may 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) may be formed to correspond to the second outer diameter (D3) of the second core (200).

[0074] 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) may be the same, but may be a size that includes an error caused by work or construction.

[0075] According to one embodiment of the present invention, an electrode winding core includes a connecting member (300) connecting a first core (100) and a second core (200), so that an electrode wound on 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 a bobbin of a slitter.

[0076] In addition, since the first core (100) and the second core (200) are separable by the connecting member (300) and the fastening member (400), the first core (100) and the second core (200) can be used independently.

[0077] For example, the first core (100) and the second core (200) can be separated by removing the fastening unit (400) and releasing the connection with the connecting member (300).

[0078] Accordingly, the first core (100) is mounted on a slitter or shaft having a size corresponding to the first inner diameter (D2) and the electrode is wound, and further, the second core (200) is mounted on a slitter or shaft having a size corresponding to the second inner diameter (D4) and then the electrode is wound.

[0079] Meanwhile, the material constituting the first core (100), the second core (200), and the connecting member (320) may be aluminum, but is not limited thereto, and may be another metal material.

[0080] The electrode wound around the core may be either a positive electrode or a negative electrode. The positive electrode comprises 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 holding portion. The positive electrode active material may be mixed with a conductive material and a binder, and, if necessary, additional fillers may be added.

[0081] The negative electrode further comprises a negative electrode current collector and a negative electrode active material coated on the upper and / or lower surface of the negative electrode current collector to form a holding portion. The negative electrode active material may further include a conductive material, a binder, and, if necessary, a filler.

[0082] Since these positive and negative electrodes correspond to known technologies, a detailed description will be omitted.

[0083]

[0084] As described above, specific parts of the present invention have been described in detail. To those skilled in the art, such specific descriptions are merely preferred embodiments, and the scope of the present invention is not limited thereby. 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 is natural that such changes and modifications fall within the scope of the appended patent claims.

[0085] (Explanation of symbols)

[0086] 100: 1st core

[0087] 110: Hole 1

[0088] 120: First fastening hole

[0089] 200: Second core

[0090] 210: Hole 2

[0091] 220: Second fastening hole

[0092] 300: Connecting member

[0093] 310: First connecting member

[0094] 311: Third Hall

[0095] 312: Third fastening hole

[0096] 312a: Third inner fastening hole 312b: Third outer fastening hole

[0097] 320: Second connecting member

[0098] 321: 4th hole

[0099] 322: 4th fastening hole

[0100] 322a: 4th inner fastening hole 322b: 4th outer fastening hole

[0101] 400: Fastening Unit

[0102] D1: First outer diameter

[0103] D2: First inner diameter

[0104] D3: Second outer diameter

[0105] D4: Second inner diameter

Claims

1. As an electrode winding core for winding an electrode, A first core in the shape of a ring having a first outer diameter; A second core in the form of a ring having a second inner diameter larger than the first outer diameter; and An electrode winding core, characterized by including a connecting member connecting the first core and the second core.

2. In paragraph 1, The first core is formed to have a first hole having a first inner diameter smaller than the first outer diameter, An electrode winding core, characterized in that the second core is formed to have a second hole having the second inner diameter.

3. In paragraph 2, An electrode winding core, characterized in that the first core is arranged in the second hole so as to be provided on the inner side of the second core.

4. In paragraph 1, An electrode winding core, characterized in that the first core and the second core are separable by the connecting member.

5. In paragraph 2, The above connecting member is, A first connecting member connecting one side of the first core and one side of the second core; and An electrode winding core characterized by including a second connecting member connecting the first surface of the first core and the second surface of the second core.

6. In paragraph 5, An electrode winding core, characterized in that the first connecting member and the second connecting member are formed so as not to overlap the first hole.

7. In paragraph 6, The inner diameter of the above first connecting member corresponds to the above first inner diameter, An electrode winding core, characterized in that the outer diameter of the first connecting member is formed to correspond to the second outer diameter.

8. In paragraph 6, The inner diameter of the above second connecting member corresponds to the first inner diameter, An electrode winding core, characterized in that the outer diameter of the second connecting member is formed to correspond to the second outer diameter.

9. In paragraph 5, A first fastening hole is formed on one side of the first core, A second fastening hole is formed on one side of the second core, An electrode winding core, characterized in that a third inner fastening hole is formed in the first connecting member at a position corresponding to the first fastening hole, and a third outer fastening hole is formed at a position corresponding to the second fastening hole.

10. In paragraph 9, An electrode winding core, characterized in that the first fastening hole and the third inner fastening hole, and the second fastening hole and the third outer fastening hole are joined by a fastening unit.

11. In paragraph 5, A first fastening hole is formed on the surface of the first core, A second fastening hole is formed on the surface of the second core, An electrode winding core, characterized in that 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. In paragraph 11, An electrode winding core, characterized in that the first fastening hole and the fourth inner fastening hole, and the second fastening hole and the fourth outer fastening hole are joined by a fastening unit.

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