Core for winding electrode

Abstract

The present invention relates to an electrode winding core for winding an electrode, comprising: an annular first core having a first outer diameter; an annular 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 from Korean Patent Application No. 2023-0159440, filed on November 16, 2023, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present invention relates to a core for a wound electrode, and more particularly, to a core for a wound electrode that can be mounted on a slitting machine having different sizes. Background Art

[0003] As the technology of mobile devices has developed and the demand for them has increased, secondary batteries that can be charged and discharged have been used as energy sources for various mobile devices. Secondary batteries have also attracted attention as energy sources for electric vehicles and hybrid electric vehicles, which are proposed as alternatives to existing gasoline and diesel vehicles that use fossil fuels.

[0004] According to the shape of the battery case, secondary batteries are divided into cylindrical batteries having an electrode assembly installed in a cylindrical metal can, prismatic batteries having an electrode assembly installed in a prismatic metal can, and pouch-type batteries having an electrode assembly installed in a pouch-type case made of aluminum laminate.

[0005] Figure 1 is a view illustrating a state in which electrodes are wound around a conventional core.

[0006] Reference Figure 1 , a core 1 configured in a substantially cylindrical shape and having a through hole formed at the center thereof 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, the diameter of the central through hole of the core 1 must be substantially the same as the outer diameter of the winding shaft, and therefore when the diameter of the winding shaft is changed, a new core must be used.

[0008] Meanwhile, the manufacture of electrodes includes a so-called slitting process of cutting the electrodes to fit the size of the battery, and after the slitting process, a slitting mandrel is required to wind the electrodes again.

[0009] However, as mentioned above, if the outer diameter of the rotating shaft changes, the inner diameter of the slitting core must also be changed accordingly. Especially if the electrode has been wound around the core, it is difficult to process the electrode wound around the core without changing the shaft.

[0010] (Prior art literature)

[0011] (Patent Document 1) Korean Patent Application Publication No. 10-2018-0028469 Summary of the Invention

[0012] Technical issues

[0013] The present invention has been made in view of the above problems, and an object of the present invention is to provide a core for wound electrodes that can be mounted to a rotating shaft or a slitter even if the diameter of the rotating shaft or the slitter is different from that of the core.

[0014] Technical Solution

[0015] As a technical means for achieving the above-mentioned purpose, a core for winding an electrode, configured to allow an electrode to be wound around it, according to an embodiment of the present invention, includes: 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 configured to connect the first core 100 and the second core 200 to each other.

[0016] In addition, in the core for wound electrodes according to an embodiment of the present invention, the first core 100 may be 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 may be formed to have a second hole 210 having a second inner diameter D4.

[0017] In addition, in the core for a wound electrode according to the embodiment of the present invention, the first core 100 may be disposed in the second hole 210 so as to be disposed inside the second core 200 .

[0018] Furthermore, in the core for a wound electrode according to the embodiment of the present invention, the first core 100 and the second core 200 are detachably coupled to each other via the connection member 300 .

[0019] In addition, in the core for wound electrodes according to an embodiment of the present invention, the connecting member 300 may include: a first connecting member 310 configured to connect one surface of the first core 100 and one surface of the second core 200 to each other; and a second connecting member 320 configured to connect the other surface of the first core 100 and the other surface of the second core 200 to each other.

[0020] In addition, in the core for a wound electrode according to an embodiment of the present invention, the first connection member 310 and the second connection member 320 may be formed not to overlap with the first hole 110 .

[0021] In addition, in the core for wound electrodes according to the embodiment of the present invention, the inner diameter of the first connection member 310 may be formed to correspond to the first inner diameter D2 , and the outer diameter of the first connection member 310 may be formed to correspond to the second outer diameter D3 .

[0022] Furthermore, in the core for wound electrodes according to the embodiment of the present invention, the inner diameter of the second connection member 320 may be formed to correspond to the first inner diameter D2 , and the outer diameter of the second connection member 320 may be formed to correspond to the second outer diameter D3 .

[0023] In addition, in the core for wound electrodes according to an embodiment of the present invention, a first fastening hole 120 may be formed in one surface of the first core 100, a second fastening hole 220 may be formed in one surface of the second core 200, and 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.

[0024] Furthermore, in the core for wound electrodes according to the embodiment of the present invention, the first fastening hole 120 and the third inner fastening hole 312 a may be coupled to each other via the fastening unit 400 , and the second fastening hole 220 and the third outer fastening hole 312 b may be coupled to each other via the fastening unit 400 .

[0025] In addition, in the core for winding an electrode according to an embodiment of the present invention, a first fastening hole 120 may be formed in the other surface of the first core 100, a second fastening hole 220 may be formed in the other surface of the second core 200, and 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.

[0026] In addition, in the core for wound electrodes according to the embodiment of the present invention, the first fastening hole 120 and the fourth inner fastening hole 322 a may be coupled to each other via the fastening unit 400 , and the second fastening hole 220 and the fourth outer fastening hole 322 b may be coupled to each other via the fastening unit 400 .

[0027] Beneficial effects

[0028] As is apparent from the above description, in the core for wound electrodes according to the present invention, the first core and the second core having different inner and outer diameters are detachably connected to each other via a connecting member, whereby the core for wound electrodes can be mounted to a plurality of shafts or slitters having different outer diameters.

[0029] Furthermore, in the core for winding an electrode according to the present invention, the electrode wound around the second core can be mounted to a shaft or slitter using the first core, thereby eliminating the need to provide a separate shaft or slitter for the second core and thus reducing equipment investment costs for electrode production. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a view illustrating a state in which electrodes are wound around a conventional core.

[0031] Figure 2 is a perspective view illustrating a core for wound electrodes according to an embodiment of the present invention.

[0032] Figure 3 is an exploded perspective view illustrating a core for a wound electrode according to an embodiment of the present invention.

[0033] Figure 4 is a cross-sectional view illustrating a first core of a core for a wound electrode according to an embodiment of the present invention.

[0034] Figure 5 is a cross-sectional view illustrating a second core of a core for a wound electrode according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that the preferred embodiments of the present invention can be easily implemented by those skilled in the art. However, when describing the operating principles of the preferred embodiments of the present invention in detail, the detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention.

[0036] In addition, the same reference numerals will be used throughout the drawings to refer to parts that perform similar functions or operations. Throughout the specification, when a part is said to be connected to another part, a part may not only be directly connected to another part, but also be indirectly connected to another part via another part. In addition, the inclusion of a certain element does not mean the exclusion of other elements, but rather means that such elements may also be included unless otherwise mentioned.

[0037] Hereinafter, a core for a wound electrode according to the present invention will be described. The core for a wound electrode may be configured to allow an electrode to be wound around the core.

[0038] Figure 2 is a perspective view illustrating a core for wound electrodes according to an embodiment of the present invention, and Figure 3 : is an exploded perspective view illustrating a core for wound electrodes according to an embodiment of the present invention. Figure 4 is a cross-sectional view illustrating a first core of a core for a wound electrode according to an embodiment of the present invention, and Figure 5 is a cross-sectional view illustrating a second core of a core for a wound electrode according to an embodiment of the present invention.

[0039] Reference Figures 2 to 5 , a core for a wound electrode according to the present invention includes a first core 100 , a second core 200 , a connection member 300 , and a fastening unit 400 .

[0040] The first core 100 is in the form of a ring having a first outer diameter D1 and may be formed to have a first hole 110 having a first inner diameter D2 smaller than the first outer diameter D1 .

[0041] The second core 200 is in the form of a ring having a second inner diameter D4 greater than the first outer diameter D1 of the first core 100 , and may be formed with a second hole 210 having the second inner diameter D4 .

[0042] 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 , and the second outer diameter D3 of the second core 200 .

[0043] 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; however, the present invention is not necessarily limited thereto.

[0044] In addition, the first core 100 may be disposed in the second hole 210 so as to be disposed inside the second core 200. For example, the first core 100 may be disposed such that the center of the second core 200 and the center of the first core 100 coincide with each other.

[0045] First fastening holes 120 may be formed in one surface and the other surface of the first core 100 , wherein an internal thread may be formed in each of the first fastening holes 120 .

[0046] In addition, second fastening holes 220 may be formed in one surface and the other surface of the second core 200 , wherein an internal thread may be formed in each of the second fastening holes 220 .

[0047] Next, the connection member 300 is configured to connect the first core 100 and the second core 200 to each other, and the connection member 300 may include a first connection member 310 and a second connection member 320 .

[0048] First, the first connecting member 310 connects one surface of the first core 100 and one surface of the second core 200 to each other, and the first connecting member 310 is a circular plate cut into a roughly "U" shape including a central portion, in which a plurality of third holes 311 are formed, and the circular plate has a certain thickness.

[0049] Here, the third hole 311 may be configured to allow a worker to pass a hand therethrough to grasp the first connection member 310 so that the first connection member can be easily disposed on one surface of the first core 100 and one surface of the second core 200 .

[0050] In addition, the first connection member 310 may have a third inner fastening hole 312 a formed at a position corresponding to the first fastening hole 120 and a third outer fastening hole 312 b formed at a position corresponding to the second fastening hole 220 .

[0051] The first fastening hole 120 and the third inner fastening hole 312 a may be coupled to each other via the fastening unit 400 , and the second fastening hole 220 and the third outer fastening hole 312 b may also be coupled to each other via the fastening unit 400 .

[0052] Since the first connecting member 310 is cut into a substantially "U" shape including a central portion, the number of the third inner fastening holes 312a and the number of the third outer fastening holes 312b can be reduced, thereby reducing the time required for connecting the first core 100 and the second core 200 compared to when the first connecting member 310 is configured in the form of a disc. In addition, the "U"-shaped first connecting member 310 can reliably connect the first core 100 and the second core 200 to each other.

[0053] In addition, for example, the fastening unit 400 can be configured as a screw unit having external threads, and thus the first fastening hole 120 and the third inner fastening hole 312a can be screwed to each other via the fastening unit 400, and the second fastening hole 220 and the third outer fastening hole 312b can be screwed to each other via the fastening unit 400.

[0054] In other words, the fastening unit 400 extends through the third inner fastening hole 312a and the first fastening hole 120 at the same time and is coupled to the first fastening hole 120, thereby fixing one surface of the first core 100 and the first connecting member 310 to each other. In addition, the fastening unit 400 extends through the third outer fastening hole 312b and the second fastening hole 220 at the same time and is coupled to the second fastening hole 220, thereby fixing one surface of the second core 200 and the first connecting member 310 to each other.

[0055] At this time, it is preferable that the first connection member 310 does not overlap with the first hole 320 .

[0056] More specifically, the inner diameter of the circle corresponding to the central portion of the “U”-shaped cut portion of the first connecting member 310 may 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 may be formed to correspond to the second outer diameter D3 of the second core 200 .

[0057] Here, the inner diameter of the first connection member 310 corresponding to the first inner diameter D2 and the outer diameter of the first connection member 310 corresponding to the second outer diameter D3 may be semantically identical to each other, but the diameters may include errors caused by operation or introduced during construction.

[0058] At the same time, the second connecting member 320 connects the other surface of the first core 100 and the other surface of the second core 200 to each other, and the second connecting member 320 is a circular plate cut into a roughly "U" shape including a central portion, in which a plurality of fourth holes 312 are formed, and the circular plate has a certain thickness.

[0059] Here, the fourth hole 312 may be configured to allow a worker to pass his hand therethrough to grasp the second connection member 320 so that the second connection member can be easily disposed on the other surface of the first core 100 and the other surface of the second core 200 .

[0060] In addition, the second connection member 320 may have a fourth inner fastening hole 322 a formed at a position corresponding to the first fastening hole 120 and a fourth outer fastening hole 322 b formed at a position corresponding to the second fastening hole 220 .

[0061] The first fastening hole 120 and the fourth inner fastening hole 322 a may be coupled to each other via the fastening unit 400 , and the second fastening hole 220 and the fourth outer fastening hole 322 b may also be coupled to each other via the fastening unit 400 .

[0062] Since the second connecting member 320 is cut into a substantially "U" shape including a central portion, the number of the fourth inner fastening holes 322a and the number of the fourth outer fastening holes 322b can be reduced, thereby reducing the time required for connecting the first core 100 and the second core 200 compared to when the second connecting member 320 is configured in the form of a disc. In addition, the "U"-shaped second connecting member 320 can reliably connect the first core 100 and the second core 200 to each other.

[0063] In addition, for example, the fastening unit 400 can be configured as a screw unit having an external thread, and thus the first fastening hole 120 and the fourth inner fastening hole 322a can be screwed to each other via the fastening unit 400, and the second fastening hole 220 and the fourth outer fastening hole 322b can be screwed to each other via the fastening unit 400.

[0064] In other words, the fastening unit 400 extends through the fourth inner fastening hole 322a and the first fastening hole 120 at the same time and is coupled to the first fastening hole 120, thereby fixing the other surface of the first core 100 and the second connecting member 320 to each other. In addition, the fastening unit 400 extends through the fourth outer fastening hole 322b and the second fastening hole 220 at the same time and is coupled to the second fastening hole 220, thereby fixing the other surface of the second core 200 and the second connecting member 320 to each other.

[0065] At this time, it is preferable that the second connection member 320 does not overlap with the first hole 320 .

[0066] More specifically, the inner diameter of the circle corresponding to the central portion of the “U”-shaped cut portion of 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 .

[0067] Here, an inner diameter of the second connection member 320 corresponding to the first inner diameter D2 and an outer diameter of the second connection member 320 corresponding to the second outer diameter D3 may be semantically identical to each other, but the diameters may include errors caused by operation or introduced during construction.

[0068] Since the core for winding an electrode according to an embodiment of the present invention includes the connecting member 300 connecting the first core 100 and the second core 200 to each other, the electrode wound around the second core 200 can be mounted to a slitting machine using only the first core 100. For example, the core for winding an electrode can be mounted to a bobbin of the slitting machine.

[0069] In addition, since the first core 100 and the second core 200 are separately coupled to each other via the connection member 300 and the fastening member 400 , the first core 100 and the second core 200 may be independently used.

[0070] For example, when the coupling between the first and second cores 100 and 200 and the connection member 300 is released by removing the fastening unit 400 , the first and second cores 100 and 200 may be separated from each other.

[0071] Therefore, the first core 100 can be mounted to a slitter or shaft having a size corresponding to the first inner diameter D2 so that the electrode is wound around it, and the second core 200 can also be mounted to a slitter or shaft having a size corresponding to the second inner diameter D4 so that the electrode is wound around it.

[0072] Meanwhile, each of the first core 100 , the second core 200 , and the connection member 320 may be made of aluminum; however, the present invention is not limited thereto, and other metals may be used.

[0073] In addition, the electrode wound around the core can be a positive electrode or a negative electrode. The positive electrode includes a positive electrode current collector and a positive electrode active material applied to the upper surface and / or lower surface of the positive electrode current collector to form a coating portion. The positive electrode active material can be mixed with a conductive agent and a binder, and a filler can be further added as needed.

[0074] In addition, the negative electrode includes a negative electrode current collector and a negative electrode active material applied to the upper surface and / or lower surface of the negative electrode current collector to constitute a coating portion. The negative electrode active material may be mixed with a conductive agent and a binder, and a filler may be further added as needed.

[0075] The positive electrode and the negative electrode are known, and therefore a detailed description thereof will be omitted.

[0076] Although the specific details of the present invention have been described in detail, it will be understood by those skilled in the art that the detailed description thereof only discloses the preferred embodiments of the present invention and therefore does not limit the scope of the present invention. Therefore, it will be understood by those skilled in the art that various changes and modifications are possible without departing from the scope and technical concept of the present invention, and it will be apparent that such changes and modifications fall within the scope of the appended claims.

[0077] Description of Reference Signs

[0078] 100: First Core

[0079] 110: First hole

[0080] 120: First fastening hole

[0081] 200: Second core

[0082] 210: Second hole

[0083] 220: Second fastening hole

[0084] 300: Connecting components

[0085] 310: First connecting member

[0086] 311: The third hole

[0087] 312: Third fastening hole

[0088] 312a: third inner fastening hole 312b: third outer fastening hole

[0089] 320: Second connecting member

[0090] 321: The fourth hole

[0091] 322: Fourth fastening hole

[0092] 322a: Fourth inner fastening hole 322b: Fourth outer fastening hole

[0093] 400: Fastening unit

[0094] D1: first outer diameter

[0095] D2: First inner diameter

[0096] D3: Second outer diameter

[0097] D4: Second inner diameter

Claims

1. A core for winding an electrode, characterized in that: The core is configured to allow an electrode to be wound around the core, the core comprising: a first annular core having a first outer diameter; an annular second core having a second inner diameter larger than the first outer diameter; and A connecting member configured to connect the first core and the second core to each other.

2. The core for winding an electrode according to claim 1, characterized in that The first core is formed to have a first hole having a first inner diameter smaller than the first outer diameter, and The second core is formed with a second bore having the second inner diameter.

3. The core for winding an electrode according to claim 2, characterized in that: The first core is disposed in the second hole so as to be disposed inside the second core.

4. The core for winding an electrode according to claim 1, characterized in that The first core and the second core are detachably coupled to each other via the connection member.

5. The core for winding an electrode according to claim 2, characterized in that The connecting member comprises: a first connecting member configured to connect one surface of the first core and one surface of the second core to each other; and A second connecting member configured to connect the other surface of the first core and the other surface of the second core to each other.

6. The core for winding an electrode according to claim 5, characterized in that The first connection member and the second connection member are formed so as not to overlap with the first hole.

7. The core for winding an electrode according to claim 6, characterized in that: The inner diameter of the first connecting member is formed to correspond to the first inner diameter, and The outer diameter of the first connection member is formed to correspond to the second outer diameter.

8. The core for winding an electrode according to claim 6, characterized in that The inner diameter of the second connecting member is formed to correspond to the first inner diameter, and The outer diameter of the second connection member is formed to correspond to the second outer diameter.

9. The core for winding an electrode according to claim 5, characterized in that a first fastening hole is formed in the one surface of the first core, A second fastening hole is formed in the one surface of the second core, and The first connection 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 core for winding electrodes according to claim 9, characterized in that The first fastening hole and the third inner fastening hole are coupled to each other via a fastening unit, and The second fastening hole and the third outer fastening hole are coupled to each other via the fastening unit.

11. The core for wound electrodes according to claim 5, characterized in that a first fastening hole is formed in the other surface of the first core, A second fastening hole is formed in the other surface of the second core, and The second connection 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 core for wound electrodes according to claim 11, characterized in that The first fastening hole and the fourth inner fastening hole are coupled to each other via a fastening unit, and The second fastening hole and the fourth outer fastening hole are coupled to each other via the fastening unit.

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