Copper foil storage device

Abstract

The present invention includes: a housing body having a housing space in which a copper foil wound around a core is housed; a support portion coupled to the housing body to support both end portions of the core; and an elastic member disposed between the support portion and the core to support the core, the elastic member including: a main body portion; a plurality of first protrusions disposed on a top surface of the main body portion to extend in a length direction of the core; and a plurality of second protrusions disposed on a bottom surface of the main body portion to extend in a direction perpendicular to an extension direction of the first protrusions, thereby being able to dampen vibrations in a frequency band generated during transportation.

Description

Technical Field

[0001] This invention relates to a copper foil storage device for storing copper foil used in the manufacture of negative electrodes for secondary batteries, flexible printed circuit boards, etc. Background Technology

[0002] Copper foil is used in the manufacture of various products, such as negative electrodes for secondary batteries and flexible printed circuit boards (FPCBs). This copper foil is manufactured through an electroplating process where an electrolyte is supplied between the positive and negative electrodes, followed by the application of an electric current. As mentioned above, an electrolytic copper foil manufacturing apparatus is used in the electroplating process.

[0003] Copper foil manufactured using an electrolytic copper foil manufacturing apparatus is transported to customers in a core-wound state. For example, core-wound copper foil can be loaded into vehicles such as automobiles, ships, railway vehicles, and airplanes for transportation.

[0004] In this transportation process, the copper foil storage device serves to hold the copper foil wound around the core. Existing copper foil storage devices hold the copper foil wound around the core by supporting the core that protrudes from both sides of the copper foil.

[0005] Therefore, vibrations and swaying generated during the movement of the transport vehicle are transmitted from the copper foil to the core via the storage device, and then from the core to the copper foil. Since the vibrations and swaying transmitted to the copper foil can cause flutter, there is a problem of defects in the copper foil during transportation. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The present invention is proposed to solve the above-mentioned problems and aims to provide a copper foil storage device that can reduce the defect rate of copper foil caused by vibration, shaking and other factors during transportation.

[0008] Technical solutions to the problem

[0009] To address the issues described above, the present invention may include the following configuration.

[0010] The copper foil storage device of the present invention may include: a storage body having a storage space for storing copper foil wound around a core; a support portion connected to the storage body and supporting both ends of the core; and an elastic member disposed between the support portion and the core to support the core. The elastic member may include: a main body; a plurality of first protrusions disposed on the top surface of the main body and extending along the length direction of the core; and a plurality of second protrusions disposed on the bottom surface of the main body and extending in a direction perpendicular to the extending direction of the first protrusions.

[0011] Invention Effects

[0012] According to the present invention, the following effects can be expected.

[0013] The elastic member of this invention is disposed between the core and the support portion. The elastic member includes a main body portion, a first protrusion, and a second protrusion. Therefore, this invention can optimally buffer vibrations and swaying generated during transportation. That is, since the intensity of vibrations transmitted to the core can be reduced, the defect rate in the copper foil caused by vibrations and swaying can be reduced. Therefore, this invention can not only improve the quality of the copper foil after transportation, but also improve the stability and ease of copper foil transportation operations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating a copper foil storage device according to an embodiment of the present invention.

[0015] Figure 2 It is shown Figure 1 The diagram shows the core, elastic member, and support.

[0016] Figure 3 It is shown in a general way. Figure 2 The diagram shows a three-dimensional representation of the elastic component.

[0017] Figure 4 yes Figure 3 The front view of the elastic member is shown in the figure.

[0018] Figure 5 yes Figure 3 The side view of the elastic member shown in the figure.

[0019] Figure 6 It is shown Figure 3 The diagram shows the state of the elastic member and the support combined.

[0020] Figure 7 It is shown Figure 1 The graph shows the vibration attenuation frequency band of the copper foil storage device.

[0021] Figure 8 It is shown Figure 1 The front view of the core and copper foil is shown in the image.

[0022] Figure 9 It is shown Figure 1 The graph shows a first experimental example of a copper foil storage device.

[0023] Figure 10 It is shown Figure 1 The graph shows a second experimental example of a copper foil storage device.

[0024] Figure 11 It means Figure 9 and Figure 10 A table showing the vibration attenuation RMS values ​​of experimental examples. Detailed Implementation

[0025] Hereinafter, with reference to the accompanying drawings, a specific embodiment of the copper foil storage device 1 of the present invention will be described in detail.

[0026] Figure 1 This is a schematic diagram illustrating a copper foil storage device 1 according to an embodiment of the present invention. Figure 2 It is shown Figure 1 The figure shows the core 11, the elastic member 30, and the support 20. Figure 3 It is shown in a general way. Figure 2 The perspective view of the elastic member 30 shown in the figure. Figure 4 yes Figure 3 The front view of the elastic member 30 shown in the figure. Figure 5 yes Figure 3 The side view of the elastic member 30 shown in the figure. Figure 6 It is shown Figure 3 The diagram shows the state in which the elastic member 30 and the support 20 are combined.

[0027] Reference Figures 1 to 6 The copper foil storage device 1 of the present invention stores the copper foil 12 wound around the core 11 to prevent deformation by buffering vibrations generated during transportation and other processes. The copper foil 12 is used to manufacture negative electrodes for secondary batteries, flexible printed circuit boards (FPCBs), etc.

[0028] A copper foil storage device 1 includes a storage body 10, a support portion 20, and an elastic member 30. The storage body 10 has a storage space for storing a copper foil 12 wound around a core 11. A cover 13 can be attached to the upper part of the storage body 10 to form the storage space. The support portion 20 is spaced apart on both sides of the storage body 10. The support portion 20 supports both ends of the core 11. The elastic member 30 is disposed between the support portion 20 and the core 11, supporting the core 11. The support portion 20 has a curved surface or curvature R corresponding to the outer peripheral surface of the core 11.

[0029] In one embodiment, the elastic member 30 has a predetermined length and includes a main body 300, a first protrusion 310, and a second protrusion 320. The main body 300 may have a flat plate shape. The first protrusion 310 is disposed on the top surface of the main body 300 and extends in a direction A perpendicular to the length direction of the elastic member 30. That is, the first protrusion 310 extends in the length direction A of the core 11. The second protrusion 320 is disposed on the bottom surface of the main body 300 and extends in the length direction B of the elastic member 30. That is, the second protrusion 320 extends in a direction B perpendicular to the extension direction A of the first protrusion 310. A plurality of first protrusions 310 and second protrusions 320 are disposed.

[0030] The elastic member 30 has a first thickness T and a first width W. The first width W is based on the length direction A of the core 11 (the direction perpendicular to the length direction of the elastic member). The first thickness T is based on a direction that is perpendicular to both the extension direction A of the first protrusion 310 and the extension direction B of the second protrusion 320. Here, the first width W can be 2 to 4 times the first thickness T. Accordingly, compared with the prior art that does not have an elastic member or the prior art that uses a common pad, vibration is buffered. This will be explained in detail later.

[0031] Figure 7 It is shown Figure 1 The graph shown below illustrates the vibration attenuation frequency band of the copper foil storage device 1. Figure 8 It is shown Figure 1 The front view of the core 11 and copper foil 12 is shown in the figure. Figure 7 The horizontal axis represents the natural frequency ratio, and the vertical axis represents the transmissibility. The natural frequency ratio is the ratio of a specific frequency to the resonant frequency, and the transmissibility is the ratio of the force transmitted to the interior of the copper foil storage device 1 to the external force applied from the exterior of the copper foil storage device 1.

[0032] Reference Figure 7 and Figure 8 The copper foil storage device 1 of one embodiment of the present invention has a resonant frequency fr calculated by the following formula.

[0033] Calculation formula

[0034] fr=

[0035] Where fr is the resonant frequency and fs is the starting frequency of the attenuation band.

[0036] The copper foil storage device 1 of the present invention is typically subjected to vibrations corresponding to the 100Hz to 400Hz frequency band during its transportation. Therefore, in the case of the copper foil storage device 1, a vibration isolation design for the 100Hz to 400Hz frequency band is applied. As a result, the starting frequency fs of the attenuation band is 100Hz. Based on this, the resonant frequency fr of the copper foil storage device 1 of the present invention is approximately 70Hz. Figure 7 This is a graph showing the vibrational transmissibility relative to the frequency band at a resonant frequency of 70Hz. For example... Figure 7 As shown, since the resonant frequency of the copper foil storage device 1 of the present invention is 70Hz, vibration isolation can be achieved in the frequency band from 100Hz to 400Hz. In particular, the vibration isolation performance varies with the damping ratio. Therefore, it is important to ensure a damping ratio that exhibits optimal vibration isolation performance. For this purpose, the copper foil storage device 1 of the present invention uses an elastic member 30.

[0037] Figure 9 It is shown Figure 1 The graph shows a first experimental example of the copper foil storage device 1.

[0038] Reference Figure 1 , Figures 7 to 9 When using the elastic member 30 according to an embodiment of the present invention, vibration is mitigated in the frequency band of vibration generated during transportation compared to the prior art. The prior art includes experimental examples where no pad is used between the core 11 and the support 20, and experimental examples using ordinary pads. In the case of the present invention, experimental examples were applied where the elastic member 30 has a first thickness T of 10T (10mm) and a first width W of 28mm, and experimental examples also applied where the elastic member 30 has a first thickness T of 10T (10mm) and a first width W of 20mm. When using the elastic member 30 of the present invention, vibration is attenuated in the frequency band of transportation compared to the prior art. The vibration transfer function (amplitude) is reduced by approximately 10dB. That is, the vibration energy is reduced to 1 / 10.

[0039] Here, the ratio of the length L1 of the core 11, the diameter D of the core 11, and the length L2 of the copper foil 12 wound around the core 11 is 1500:153:1358. Furthermore, the ratio of the bottom edge L3, the height L4, and the length L5 of the storage body 10 along the length direction of the core 11 is 520:630:1620. Also, the ratio of the length L1 of the core 11 to the length L5 of the storage body 10 is 1500:1620.

[0040] Figure 10 It is shown Figure 1 The graph shows a second experimental example of the copper foil storage device 1.

[0041] Reference Figure 10The prior art includes experimental examples where no pad is used between the core 11 and the support portion 20, and experimental examples where a common pad is used. The width of the common pad is 35 mm. In the case of the present invention, experimental examples were applied where the elastic member 30 has a first thickness T of 8T (8 mm) and a first width W of 32 mm, and experimental examples were applied where the elastic member 30 has a first thickness T of 8T (8 mm) and a first width W of 17 mm. When using the elastic member 30 of the present invention, it can be confirmed that vibration is attenuated in the frequency band of the transportation process compared with the prior art.

[0042] Figure 11 It means based on Figure 9 and Figure 10 A table showing the vibration attenuation RMS values ​​of experimental examples. Figure 11 The prior art includes cases where no pad is used and cases where a regular pad is used. Furthermore, Experimental Example 1 used an elastic member 30 with a first thickness T of 10T and a first width W of 28mm. Experimental Example 2 used an elastic member 30 with a first thickness T of 8T and a first width W of 32mm. Experimental Example 3 used an elastic member 30 with a first thickness T of 10T and a first width W of 20mm. Experimental Example 4 used an elastic member 30 with a first thickness T of 8T and a first width W of 17mm.

[0043] Reference Figures 9 to 11 Compared to the prior art, vibration attenuation is improved when the first thickness T of the elastic member 30 is 8 mm to 10 mm. Furthermore, vibration attenuation is improved when the first width W of the elastic member 30 is 17 mm to 30 mm, compared to the prior art. In particular, vibration attenuation is greater when the first thickness T is 10T (10 mm), compared to the prior art. Additionally, when the elastic member 30 has the same first thickness T, the smaller the first width W, the greater the vibration attenuation. That is, the ratio of the first width W to the first thickness T of the elastic member 30 affects vibration attenuation.

[0044] Reference Figure 11 In this invention, the first width W of the elastic member 30 is 2 to 4 times the first thickness T. In this case, the vibration damping effect of the elastic member 30 is greater compared to the prior art. Figure 11 RMS in the figure represents the average value in dB of the vibration transfer function (amplitude).

[0045] On the other hand, the copper foil storage device 1 of one embodiment of the present invention may further include a sponge 40. The sponge 40 is disposed on the upper part of the support portion 20. The sponge 40 covers the top surface of the end of the core 11. Compared with the elastic member 30, the sponge 40 has a very large elasticity. Therefore, the sponge 40 does not restrict the degree of freedom of the upper part of the core 11.

[0046] In the case of the present invention described above, during the transport of the copper foil storage device 1 that houses the copper foil 12 wound around the core 11, vibrations applied to the copper foil 12 are buffered. This eliminates the risk of defects such as wrinkles that may occur in the copper foil 12 due to vibration.

[0047] The present invention described above is not limited to the foregoing embodiments and drawings. Those skilled in the art will clearly understand that various substitutions, modifications and alterations can be made without departing from the technical concept of the present invention.

Claims

1. A copper foil storage device, wherein, include: The main body of the storage unit has a storage space for storing the copper foil wound around the core; The support section is attached to the two ends of the support core of the storage body; as well as An elastic member is positioned between the support and the core to support the core. The elastic components include: The main body has a specified length; A plurality of first protrusions are disposed on the top surface of the main body and extend in a direction perpendicular to the length direction of the main body; and A plurality of second protrusions are disposed on the bottom surface of the main body, extending along the length direction of the main body, and are separately disposed in a direction perpendicular to the length direction of the main body.

2. The copper foil storage device according to claim 1, wherein, The elastic member has a first width based on the length direction of the core and a first thickness based on a direction that is perpendicular to the extension direction of both the first and second protrusions. The first width is 2 to 4 times the first thickness.

3. The copper foil storage device according to claim 2, wherein, The first thickness is 8mm to 10mm.

4. The copper foil storage device according to claim 2, wherein, The first width is 17mm to 30mm.

5. The copper foil storage device according to claim 1, wherein, The copper foil storage device has a resonant frequency fr calculated using the following formula. Calculation formula: fr= Where fr is the resonant frequency and fs is the starting frequency of the attenuation band.

6. The copper foil storage device according to claim 5, wherein, The attenuation frequency band of the copper foil storage device is 100Hz to 400Hz. The starting frequency of the attenuation band is 100Hz.

7. The copper foil storage device according to claim 1, wherein, The ratio of the core length, the core diameter, and the length of the copper foil wound around the core is 1500:153:1358.

8. The copper foil storage device according to claim 1, wherein, The ratio of the bottom edge, height, and length of the storage body along the core is 520:630:1620.

9. The copper foil storage device according to claim 7, wherein, The ratio of the core length to the length of the storage body is 1500:1620.

10. The copper foil storage device according to claim 1, wherein, It also includes a sponge, which is disposed on the upper part of the support and covers the end of the core.

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