Device for manufacturing dry electrode

Abstract

An apparatus for manufacturing a dry electrode may include: a feeder configured to supply fine powder; a plurality of main rollers sequentially disposed in the first direction and configured to roll the fine powder supplied from the feeder into a self-supporting film; and a plurality of shear rollers adjacent to the plurality of main rollers in a second direction crossing the first direction. The plurality of main rollers and the plurality of shear rollers are configured such that the self-supporting film is interposed between the main rollers and the shear rollers.

Description

Technical Field

[0001] The present disclosure relates to an apparatus for manufacturing a dry electrode. Background Art

[0002] Generally, a rechargeable battery is a battery that can be repeatedly charged and discharged.

[0003] Recently, there is an increasing demand for an apparatus for manufacturing a dry electrode for a rechargeable battery without using a solvent.

[0004] The conventional apparatus for manufacturing a dry electrode can manufacture a dry electrode by calendering a fine power including an active material, a conductive material and a binder into a self-supporting film and laminating the self-supporting film to a current collector using a calendering roller, etc. Therefore, the conventional apparatus for manufacturing a dry electrode includes a plurality of rollers for calendering the fine power into a self-supporting film.

[0005] However, the plurality of rollers in the conventional apparatus for manufacturing a dry electrode include a plurality of stretching rollers arranged to stretch the self-supporting film in addition to the plurality of forming rollers for forming the fine powder into a self-supporting film. The plurality of stretching rollers increases the overall size of the apparatus. Summary of the invention

[0006] The present disclosure provides an apparatus for manufacturing a dry electrode, the apparatus having a minimized overall size of the apparatus while improving the stretchability of a self-supporting film formed using the apparatus.

[0007] An apparatus for manufacturing a dry electrode may include: a feeder configured to supply fine powder; a plurality of main rollers arranged sequentially in a first direction and configured to roll the fine powder supplied from the feeder into a self-supporting film; and a plurality of shear rollers adjacent to the plurality of main rollers in a second direction intersecting the first direction, wherein the plurality of main rollers and the plurality of shear rollers are configured so that the self-supporting film is interposed between the main rollers and the shear rollers.

[0008] Each shear roller may be configured to stretch the self-supporting film in conjunction with one of the main rollers.

[0009] The diameters of the plurality of shear rollers are smaller than the diameter of the main roller.

[0010] The diameters of the shear rollers may increase sequentially in the first direction.

[0011] The diameters of the shear rollers may decrease sequentially in the first direction.

[0012] A ratio of a diameter of each shear roller to a diameter of the plurality of main rollers is greater than 0.1 and less than 1.

[0013] The linear speed of each shear roller may be greater than the linear speed of each main roller.

[0014] The linear speeds of the plurality of shear rollers may be successively greater in the first direction.

[0015] A spacing between each of the plurality of main rollers and a corresponding one of the plurality of shear rollers may be successively smaller in the first direction.

[0016] The plurality of main rollers may include a first main roller to which the fine powder is supplied and a second main roller adjacent to the first main roller in a first direction, the first main roller and the second main roller being configured to calender the fine powder into a self-supporting film.

[0017] The plurality of shear rollers may include a first shear roller adjacent to the second main roller in the second direction, and the second main roller and the first shear roller may be configured to stretch the self-supporting film.

[0018] The plurality of main rollers may further include a third main roller adjacent to the second main roller in the first direction, and the second main roller and the third main roller may be configured to stretch the self-supporting film.

[0019] The plurality of shear rollers may further include a second shear roller adjacent to the third main roller in the second direction, and the third main roller and the second shear roller may be configured to stretch the self-supporting film.

[0020] The first shear roller and the second shear roller may be located on opposite sides of the device in the second direction.

[0021] The diameter of the second shear roller may be greater than the diameter of the first shear roller.

[0022] The linear speed of the second shearing roller may be greater than the linear speed of the first shearing roller.

[0023] The plurality of main rollers may further include a fourth main roller adjacent to the third main roller in the first direction, and the third main roller and the fourth main roller may be configured to stretch the self-supporting film.

[0024] The plurality of shear rollers may further include a third shear roller adjacent to the fourth main roller in the second direction, and the fourth main roller and the third shear roller may be configured to stretch the self-supporting film.

[0025] The diameter of the third shearing roller may be greater than the diameter of the second shearing roller.

[0026] The linear speed of the third shearing roller may be greater than the linear speed of the second shearing roller.

[0027] According to an embodiment, the overall size of an apparatus for manufacturing a dry electrode can be minimized, and an improved stretchability of a self-supporting film can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a side view showing an apparatus for manufacturing a dry electrode according to an embodiment.

[0029] Figure 2 is a side view showing an apparatus for manufacturing a dry electrode according to another embodiment.

[0030] Figure 3 is a side view showing an apparatus for manufacturing a dry electrode according to still another embodiment.

[0031] Figure 4 is a table showing the experimental results of Experimental Example 1, Experimental Example 2, Experimental Example 3, and Experimental Example 4.

[0032] Figure 5 is a side view showing an apparatus for manufacturing a dry electrode according to still another embodiment.

[0033] Figure 6 TABLE 1 is a table showing the experimental results of Experimental Example 5, Experimental Example 6, and Experimental Example 7.

[0034] Description of Reference Numerals

[0035] FE: Feeder

[0036] PMR: Main Roller

[0037] PSR: Shear Roll DETAILED DESCRIPTION

[0038] Hereinafter, the present disclosure will be described more fully with reference to the accompanying drawings, in which embodiments of the present disclosure are shown. As will be appreciated by those skilled in the art, the described embodiments may be modified in various different ways, all without departing from the scope of the present disclosure.

[0039] In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “comprising” or “including”, will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0040] In the following, reference will be made to Figure 1 An apparatus for manufacturing a dry electrode according to an embodiment is described. The apparatus for manufacturing a dry electrode according to an embodiment may be an apparatus configured to manufacture a dry electrode for a rechargeable battery, but is not limited thereto and may be an apparatus for manufacturing various dry electrodes.

[0041] Figure 1 is a side view showing an apparatus for manufacturing a dry electrode according to an embodiment.

[0042] Reference Figure 1 According to an embodiment, the apparatus 1000 for manufacturing a dry electrode may include a plurality of rollers configured to calender the fine powder FS into a self-supporting film FF. However, the present disclosure is not limited to Figure 1The configuration shown may instead further include, for example, various rollers configured to laminate the self-supporting film FF onto the current collector.

[0043] The apparatus 1000 for manufacturing a dry electrode may include a feeder FE, a plurality of main rollers PMR, and a plurality of shear rollers PSR. The feeder FE may supply fine powder FS to the plurality of main rollers PMR. The fine powder FS supplied from the feeder FE to the plurality of main rollers PMR may be rolled into a self-supporting film FF.

[0044] The fine powder FS may include various active materials, conductive materials, and binders as known in the art. For example, the fine powder FS may include a metal oxide-based material, the conductive material may include carbon black, and the binder may include polytetrafluoroethylene (PTFE). The fine powder FS may be manufactured by mixing the active material, the conductive material, and the binder into a mixture using various mixing mechanisms and fiberizing the mixture into a fiberized dry powder using various fiberizing mechanisms, but is not limited thereto.

[0045] The feeder FE may include various storage mechanisms configured to store the fine powder FS and various discharge mechanisms configured to supply the fine powder FS to the plurality of main rolls PMR. The fine powder FS supplied from the feeder FE to the plurality of main rolls PMR may be calendared into a self-supporting film FF.

[0046] The plurality of main rollers PMR may calender the fine powder FS supplied from the feeder FE into a self-supporting film FF. The main rollers PMR are sequentially arranged in a first direction X, and the fine powder FS may be supplied between the plurality of main rollers PMR and calendered into a self-supporting film FF. Here, the first direction X may include a horizontal direction, but is not limited thereto. The second direction Y may be a direction intersecting the first direction X, and the second direction Y may include a vertical direction, but is not limited thereto.

[0047] The main roller PMR can roll and stretch the fine powder FS and calender it into a self-supporting film FF, but the present disclosure is not limited to this. The main rollers PMR can rotate at the same linear speed, or they can rotate at different linear speeds. The main rollers PMR can rotate at a gradually faster linear speed in the first direction X away from the feeder FE, or can rotate at a gradually slower linear speed. That is, the first main roller MR1 can rotate at a faster or slower linear speed than the second main roller MR2, the second main roller MR2 can rotate at a faster or slower linear speed than the third main roller MR3, and the third main roller MR3 can rotate at a faster or slower linear speed than the fourth main roller MR4. Each of the multiple main rollers PMR can have the same diameter, or one or more of the main rollers PMR can have a diameter different from that of the other rollers. The diameters of the plurality of master rollers PMR may gradually decrease in the first direction X away from the feeder FE, that is, the diameter of the fourth master roller MR4 may be smaller than the diameter of the third master roller MR3, the diameter of the third master roller MR3 may be smaller than the diameter of the second master roller MR2, and the diameter of the second master roller MR2 may be smaller than the diameter of the first master roller MR1. Alternatively, the plurality of master rollers PMR may have diameters that gradually increase in the first direction X away from the feeder, that is, the diameter of the fourth master roller MR4 may be larger than the diameter of the third master roller MR3, the diameter of the third master roller MR3 may be larger than the diameter of the second master roller MR2, and the diameter of the second master roller MR2 may be larger than the diameter of the first master roller MR1.

[0048] As yet another example, each main roller PMR may include a surface treatment layer such as a coating layer or a concavo-convex structure layer for improving bonding strength with respect to the self-supporting film FF. One or more of the main rollers PMR may include the same surface treatment layer or different surface treatment layers.

[0049] In one embodiment, the apparatus 1000 for manufacturing a dry electrode may include four main rollers PMR. However, the apparatus is not limited thereto. In other embodiments, the plurality of main rollers PMR may include two, three, five or more main rollers PMR.

[0050] The plurality of main rolls PMR may include a first main roll MR1 , a second main roll MR2 , a third main roll MR3 , and a fourth main roll MR4 .

[0051] The first main roller MR1 may be adjacent to the feeder FE. The first main roller MR1 may rotate in a first direction. The first direction in which the first main roller MR1 rotates may be a clockwise direction or may be a counterclockwise direction. The first main roller MR1 may calender the fine powder FS supplied from the feeder FE into a self-supporting film FF together with the second main roller MR2.

[0052] The second main roller MR2 may be adjacent to the first main roller MR1 in the first direction X. The second main roller MR2 may rotate in a second direction opposite to the first direction in which the first main roller MR1 rotates. The second direction in which the second main roller MR2 rotates may be a counterclockwise direction or may be a clockwise direction. The second main roller MR2 may calender the fine powder FS supplied from the feeder FE into a self-supporting film FF together with the first main roller MR1.

[0053] The third main roller MR3 may be adjacent to the second main roller MR2 in the first direction X. The third main roller MR3 may rotate in the first direction. The first direction in which the third main roller MR3 rotates may be a clockwise direction, or may be a counterclockwise direction. The third main roller MR3 may perform stretching of the self-supporting film FF together with the second main roller MR2. The third main roller MR3 may also perform stretching of the self-supporting film FF together with the fourth main roller MR4.

[0054] The fourth main roller MR4 may be adjacent to the third main roller MR3 in the first direction X. The fourth main roller MR4 may rotate in the second direction. The second direction in which the fourth main roller MR4 rotates may be a counterclockwise direction, or may be a clockwise direction. The fourth main roller MR4 may perform stretching of the self-supporting film FF together with the third main roller MR3.

[0055] The shear roller PSR may be located adjacent to the plurality of main rollers PMR in the second direction Y. The second direction Y may be a direction crossing the first direction X, and the second direction Y may be a vertical direction, but is not limited thereto.

[0056] The shear rollers PSR may be adjacent to the plurality of main rollers PMR in a second direction Y crossing the first direction X with the self-supporting film FF interposed therebetween. Each shear roller PSR may perform stretching of the self-supporting film together with a corresponding one of the plurality of main rollers PMR.

[0057] The diameter of each shear roller PSR may be smaller than the diameter of each of the plurality of main rollers PMR. The ratio of the diameter of each of the plurality of shear rollers PSR to the diameter of each of the plurality of main rollers PMR may be greater than 0.1 and less than 1, but is not limited thereto. The linear speed of each of the plurality of shear rollers PSR may be greater than the linear speed of each of the plurality of main rollers PMR.

[0058] The shear rollers PSR may rotate at the same linear velocity, but the present disclosure is not limited thereto, and the plurality of shear rollers PSR may rotate at different linear velocities. The linear velocity of each of the plurality of shear rollers PSR may increase sequentially in the first direction X. That is, the plurality of shear rollers PSR may rotate at a gradually faster linear velocity in the first direction X away from the feeder FE. In other cases, the plurality of shear rollers PSR may rotate at a gradually slower linear velocity in the first direction X.

[0059] Each shear roller PSR may have the same diameter, but the present disclosure is not limited thereto, and each of the plurality of shear rollers PSR may have a different diameter. The diameters of the plurality of shear rollers PSR may gradually increase or decrease in the first direction X away from the feeder FE.

[0060] Each shearing roller PSR may include a surface treatment layer such as a coating layer or a concavo-convex structure layer for improving the bonding strength with respect to the self-supporting film FF. Each shearing roller PSR may include the same surface treatment layer, or the shearing rollers PSR may have different surface treatment layers.

[0061] The plurality of shear rollers PSR may have the same diameter as the plurality of main rollers PMR, but the present disclosure is not limited thereto, and the diameter of the shear roller PSR may be different from the diameter of the main roller PMR.

[0062] In one embodiment, the plurality of shear rollers PSR may include three shear rollers PSR. However, the present disclosure is not limited thereto, and in another embodiment, the plurality of shear rollers PSR may include two, four, five or more shear rollers PSR. In addition, there may be only one shear roller.

[0063] The plurality of shear rollers PSR may include a first shear roller SR1 , a second shear roller SR2 , and a third shear roller SR3 .

[0064] The first shear roller SR1 may be adjacent to the second main roller MR2 in the second direction Y. The first shear roller SR1 may rotate in a first direction opposite to the rotation direction of the second main roller MR2. The first direction in which the first shear roller SR1 rotates may be a clockwise direction, or may be a counterclockwise direction. The first shear roller SR1 may stretch the self-supporting film FF together with the second main roller MR2. The first shear roller SR1 may have a smaller diameter than the diameter of the second main roller MR2. The first shear roller SR1 may have a greater linear velocity than the linear velocity of the second main roller MR2.

[0065] For example, the first shear roll SR1 may include a plurality of sub-rollers adjacent to each other, but the present disclosure is not limited thereto.

[0066] The second shear roller SR2 may be adjacent to the third main roller MR3 in the second direction Y. The second shear roller SR2 may be located on the opposite side of the first shear roller SR1 in the second direction Y relative to the third main roller MR3. The second shear roller SR2 may rotate in a second direction, which is opposite to the rotation direction of the third main roller MR3. The second direction in which the second shear roller SR2 rotates may be a counterclockwise direction or a clockwise direction. The second shear roller SR2 may stretch the self-supporting film FF together with the third main roller MR3. The second shear roller SR2 may have a smaller diameter than the diameter of the third main roller MR3. The second shear roller SR2 may have a greater linear speed than the linear speed of the third main roller MR3. The second shear roller SR2 may have the same diameter as the first shear roller SR1, but the present disclosure is not limited thereto. The second shear roller SR2 may have a greater linear speed than the linear speed of the first shear roller SR1, but the present disclosure is not limited thereto.

[0067] The second shear roll SR2 may include a plurality of sub-rollers adjacent to each other, but the present disclosure is not limited thereto.

[0068] The third shear roller SR3 may be adjacent to the fourth main roller MR4 in the second direction Y. The third shear roller SR3 may be located on the side opposite to the second shear roller SR2 in the second direction Y relative to the fourth main roller MR4. The third shear roller SR3 may rotate in a first direction, which is opposite to the rotation direction of the fourth main roller MR4. The first direction in which the third shear roller SR3 rotates may be a clockwise direction or may be a counterclockwise direction. The third shear roller SR3 may stretch the self-supporting film FF together with the fourth main roller MR4. The third shear roller SR3 may have a smaller diameter than the diameter of the fourth main roller MR4. The third shear roller SR3 may have a greater linear speed than the linear speed of the fourth main roller MR4. The third shear roller SR3 may have the same diameter as the second shear roller SR2, but the present disclosure is not limited thereto. The third shear roller SR3 may have a greater linear speed than the linear speed of the second shear roller SR2, but the present disclosure is not limited thereto.

[0069] The third shear roll SR3 may include a plurality of sub-rollers adjacent to each other, but the present disclosure is not limited thereto.

[0070] In the apparatus 1000 for manufacturing a dry electrode according to an embodiment, the fine powder FS supplied from the feeder FE can be rolled into a self-supporting film FF between the first main roller MR1 and the second main roller MR2. The rolled self-supporting film FF can be stretched between the second main roller MR2 and the first shear roller SR1, can be stretched for a second time between the second main roller MR2 and the third main roller MR3, can be stretched for a third time between the third main roller MR3 and the second shear roller SR2, can be stretched for a fourth time between the third main roller MR3 and the fourth main roller MR4, and can be stretched for a fifth time between the fourth main roller MR4 and the third shear roller SR3. In the apparatus 1000 for manufacturing a dry electrode, the self-supporting film FF can also be transferred to the surfaces of the second main roller MR2, the third main roller MR3, and the fourth main roller MR4.

[0071] Since the device 1000 for manufacturing a dry electrode according to an embodiment includes the plurality of main rollers PMR arranged in the first direction X and the plurality of shear rollers PSR adjacent to the plurality of main rollers PMR and inserting the self-supporting film FF together with the main rollers PMR, the overall size of the device can be minimized. At the same time, the stretching rate of the self-supporting film FF can be improved. In addition, in the device 1000 for manufacturing a dry electrode according to an embodiment, since the diameter of each of the plurality of shear rollers PSR is smaller than the diameter of each of the plurality of main rollers PMR, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased. Therefore, the stretching rate of the self-supporting film FF can be improved. In addition, in the apparatus 1000 for manufacturing a dry electrode according to an embodiment, since the linear speed of each of the plurality of shear rollers PSR is greater than the linear speed of each of the plurality of main rollers PMR, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased, and thus the stretching rate of the self-supporting film FF can be increased. Therefore, the apparatus 1000 for manufacturing a dry electrode not only has a minimized overall size, but also improves the stretching rate of the self-supporting film FF.

[0072] In the following, reference will be made to Figure 2 Description of an apparatus for manufacturing a dry electrode according to another embodiment. Portions different from the apparatus for manufacturing a dry electrode according to the above-described embodiment will be described.

[0073] Figure 2 is a side view showing an apparatus for manufacturing a dry electrode according to another embodiment.

[0074] Reference Figure 2 , an apparatus 1000 for manufacturing a dry electrode according to another embodiment may include a feeder FE, a plurality of main rolls PMR, and a plurality of shear rolls PSR.

[0075] The diameters of the plurality of shear rollers PSR increase sequentially in the first direction X. The plurality of shear rollers PSR may include a first shear roller SR1, a second shear roller SR2, and a third shear roller SR3, and the diameters of the shear rollers increase sequentially in the first direction X away from the feeder FE. That is, the diameter of the second shear roller SR2 may be greater than the diameter of the first shear roller SR1, and the diameter of the third shear roller SR3 may be greater than the diameter of the second shear roller SR2.

[0076] Since the apparatus 1000 for manufacturing a dry electrode according to another embodiment includes the plurality of main rolls PMR arranged in the first direction X and the plurality of shear rolls PSR adjacent to the plurality of main rolls PMR and with the self-supporting film FF interposed therebetween, the overall size of the apparatus can be minimized. At the same time, the stretching rate of the self-supporting film FF can be increased.

[0077] In an apparatus 1000 for manufacturing a dry electrode according to another embodiment, since the diameter of each of the multiple shear rollers PSR is smaller than the diameter of each of the multiple main rollers PMR, the shear force applied to the self-supporting film FF stretched between each of the multiple main rollers PMR and a corresponding one of the multiple shear rollers PSR can be increased, and thus, the stretching rate of the self-supporting film FF can be increased.

[0078] In the device 1000 for manufacturing a dry electrode according to another embodiment, the linear speed of each of the plurality of shear rollers PSR is greater than the linear speed of each of the plurality of main rollers PMR. Therefore, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased. Therefore, the stretching rate of the self-supporting film FF can be increased. In addition, in the device 1000 for manufacturing a dry electrode according to another embodiment, since the diameters of the plurality of shear rollers PSR increase sequentially in the first direction X, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased. Therefore, the stretching rate of the self-supporting film FF can be increased. Therefore, in the device 1000 for manufacturing a dry electrode, the overall size of the device is minimized, and there is an improved stretching rate of the self-supporting film FF.

[0079] In the following, reference will be made to Figure 3 An apparatus for manufacturing a dry electrode according to still another embodiment is described. Hereinafter, parts different from the apparatus for manufacturing a dry electrode according to the above-described embodiment will be described.

[0080] Figure 3 is a side view showing an apparatus for manufacturing a dry electrode according to still another embodiment.

[0081] Reference Figure 3 According to yet another embodiment, an apparatus 1000 for manufacturing a dry electrode may include a feeder FE, a plurality of main rolls PMR, and a plurality of shear rolls PSR.

[0082] The diameters of the plurality of shear rollers PSR decrease in sequence in the first direction X. More specifically, the plurality of shear rollers PSR may include a first shear roller SR1, a second shear roller SR2, and a third shear roller SR3. The diameter of the second shear roller SR2 may be smaller than that of the first shear roller SR1, and the diameter of the third shear roller SR3 may be smaller than that of the second shear roller SR2.

[0083] Since the apparatus 1000 for manufacturing a dry electrode according to another embodiment includes the plurality of main rolls PMR arranged in the first direction X and the plurality of shear rolls PSR adjacent to the plurality of main rolls PMR and with the self-supporting film FF interposed therebetween, the overall size of the apparatus can be minimized. At the same time, the stretching rate of the self-supporting film FF can be increased.

[0084] In the apparatus 1000 for manufacturing a dry electrode according to another embodiment, since the diameter of each of the plurality of shear rollers PSR is smaller than the diameter of each of the plurality of main rollers PMR, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased. Therefore, the stretching rate of the self-supporting film FF can be increased. In addition, in the apparatus 1000 for manufacturing a dry electrode according to another embodiment, the linear speed of each of the plurality of shear rollers PSR is greater than the linear speed of each of the plurality of main rollers PMR, and therefore, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased. Therefore, the stretching rate of the self-supporting film FF can be increased. In addition, in the apparatus 1000 for manufacturing a dry electrode according to another embodiment, since the diameter of each of the plurality of shear rollers PSR is sequentially reduced in the first direction X, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased. Therefore, the stretching rate of the self-supporting film FF can be increased. Therefore, in the apparatus 1000 for manufacturing a dry electrode, the overall size of the apparatus is minimized, and the stretching rate of the self-supporting film FF is increased.

[0085] In the following, reference is made to Figure 4 , Experimental Examples 1, 2, 3, and 4 for confirming the effects of the dry manufacturing device according to the above-described embodiment, the dry manufacturing device according to another embodiment, and the dry manufacturing device according to yet another embodiment will be described. Experimental Examples 1 to 4 were performed using one of the above-described dry manufacturing devices.

[0086] Figure 4 is a table showing the experimental results of Experimental Example 1, Experimental Example 2, Experimental Example 3, and Experimental Example 4.

[0087] exist Figure 4 , SR1 DR is a diameter ratio of the first shear roller relative to one of the plurality of main rollers, SR2 DR is a diameter ratio of the second shear roller relative to one of the plurality of main rollers, SR3 DR is a diameter ratio of the third shear roller relative to one of the plurality of main rollers, SR1 LVR is a linear speed ratio of the first shear roller relative to one of the plurality of main rollers, SR2 LVR is a linear speed ratio of the second shear roller relative to one of the plurality of main rollers, SR3 LVR is a linear speed ratio of the third shear roller relative to one of the plurality of main rollers, and film T is a thickness of the self-supporting film that has passed through the fourth main roller and the third shear roller.

[0088] Reference Figure 4 As shown in the experimental results of Experimental Example 1EX1, Experimental Example 2EX2, Experimental Example 3EX3, and Experimental Example 4EX4, it has been confirmed that the smaller the diameter of the plurality of shear rollers is compared with the diameter of the plurality of main rollers and the greater the linear speed of the plurality of shear rollers is compared with the linear speed of the plurality of main rollers, the thinner the thickness of the self-supporting film can become. Therefore, a device for manufacturing a dry electrode capable of improving the stretching rate can be provided.

[0089] In the following, reference will be made to Figure 5 An apparatus for manufacturing a dry electrode according to still another embodiment is described. Hereinafter, parts different from the apparatus for manufacturing a dry electrode according to the above-described embodiment will be described.

[0090] Figure 5 is a side view showing an apparatus for manufacturing a dry electrode according to still another embodiment.

[0091] Reference Figure 5 According to another embodiment, the apparatus 1000 for manufacturing a dry electrode may include a feeder FE, a plurality of main rollers PMR, and a plurality of shear rollers PSR. In this embodiment, the spacing between each of the plurality of main rollers PMR and a corresponding one of the plurality of shear rollers PSR decreases in the first direction X in sequence.

[0092] In the apparatus 1000 for manufacturing a dry electrode according to still another embodiment, the fine powder FS supplied from the feeder FE may be rolled into a self-supporting film FF between the first main roller MR1 and the second main roller MR2, and the rolled self-supporting film FF may be stretched for the first time in the first gap G1 between the second main roller MR2 and the first shear roller SR1, stretched for the second time in the second gap G2 between the second main roller MR2 and the third main roller MR3, stretched for the third time in the third gap G3 between the third main roller MR3 and the second shear roller SR2, stretched for the fourth time in the fourth gap G4 between the third main roller MR3 and the fourth main roller MR4, and stretched for the fifth time in the fifth gap G5 between the fourth main roller MR4 and the third shear roller SR3. The first gap G1, the second gap G2, the third gap G3, the fourth gap G4, and the fifth gap G5 (which are the gaps between each of the plurality of main rollers PMR and a corresponding one of the plurality of shear rollers PSR) may be sequentially reduced in the first direction X away from the feeder FE.

[0093] Since the apparatus 1000 for manufacturing a dry electrode according to another embodiment includes the plurality of main rollers PMR arranged in the first direction X and the plurality of shear rollers PSR adjacent to the plurality of main rollers PMR and with the self-supporting film FF interposed therebetween, the overall size of the apparatus can be minimized, and at the same time, the stretching rate of the self-supporting film FF can be improved. In addition, in the apparatus 1000 for manufacturing a dry electrode according to another embodiment, since the diameter of each of the plurality of shear rollers PSR is smaller than the diameter of each of the plurality of main rollers PMR, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased, and thus the stretching rate of the self-supporting film FF can be increased. In addition, in the device 1000 for manufacturing a dry electrode according to another embodiment, since the linear speed of each of the plurality of shear rollers PSR is greater than the linear speed of each of the plurality of main rollers PMR, the shear force applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased, and thus the stretching rate of the self-supporting film FF can be increased. In addition, in the device 1000 for manufacturing a dry electrode according to another embodiment, since the spacing between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be sequentially reduced in the first direction X, the pressure applied to the self-supporting film FF stretched between each of the plurality of main rollers PMR and the corresponding one of the plurality of shear rollers PSR can be increased. Thus, the stretching rate of the self-supporting film FF can be increased. Therefore, the overall size of the device for manufacturing the dry electrode 1000 is minimized, and the stretching rate of the self-supporting film FF can also be provided.

[0094] In the following, reference is made to Figure 6 , Experimental Examples 5, 6, and 7 for confirming the effect of the above-mentioned dry manufacturing device according to still another embodiment will be described. Figure 5 As shown, Experimental Examples 5 to 7 were performed by using the dry manufacturing apparatus according to the above-mentioned further embodiment.

[0095] Figure 6 is a table showing the experimental results of Experimental Examples 5 to 7.

[0096] exist Figure 6 , G1, G2, G3, G4 and G5 are respectively the first spacing, second spacing, third spacing, fourth spacing and fifth spacing of the above-mentioned dry manufacturing device according to another embodiment, and film T is the thickness of the self-supporting film that has passed through the fourth main roller and the third shear roller.

[0097] Reference Figure 6 The experimental results of Experimental Example 5EX5, Experimental Example 6EX6, and Experimental Example 7EX7 show that as the spacing between each of the plurality of main rollers and the corresponding one of the plurality of shear rollers decreases in the first direction, the thickness of the self-supporting film becomes thinner. Therefore, the apparatus for manufacturing a dry electrode can improve the stretching rate.

[0098] While the present disclosure has been described in conjunction with what are presently considered to be feasible embodiments, it is to be understood that the present disclosure is not limited to the disclosed embodiments. Instead, the present disclosure encompasses various modifications and equivalent arrangements.

Claims

1. A device for manufacturing a dry electrode, the device comprising: a feeder configured to supply a fine powder; a plurality of main rollers arranged sequentially in a first direction and configured to calender the fine powder supplied from the feeder into a self-supporting film; as well as a plurality of shear rollers, adjacent to the plurality of main rollers in a second direction intersecting the first direction, The plurality of main rollers and the plurality of shear rollers are configured such that the self-supporting film is interposed between the main rollers and the shear rollers.

2. The apparatus of claim 1, wherein each of the shear rollers is configured to stretch the self-supporting film together with one of the main rollers.

3. The apparatus of claim 1, wherein the shear roller has a diameter smaller than the main roller. 4 . The device according to claim 3 , wherein the diameters of the plurality of shear rollers increase sequentially in the first direction. 5 . The apparatus according to claim 3 , wherein the diameters of the plurality of shear rollers decrease sequentially in the first direction. 6 . The apparatus according to claim 3 , wherein a ratio of the diameter of each of the shear rollers to the diameter of each of the main rollers is greater than 0.1 and less than 1. 7 .

7. The apparatus of claim 1, wherein the shear roller is configured to have a linear speed greater than a linear speed of the main roller.

8. The apparatus according to claim 7, wherein the linear speeds of the plurality of shear rollers are successively greater in the first direction.

9. The apparatus of claim 1, wherein a spacing between each of the plurality of main rollers and a corresponding one of the plurality of shear rollers is successively smaller in the first direction.

10. The apparatus of claim 1, wherein the plurality of main rollers comprises: a first main roller to which the fine powder is supplied; and a second main roller adjacent to the first main roller in the first direction, and The first main roller and the second main roller are configured to calender the fine powder into the self-supporting film.

11. The apparatus of claim 10, wherein the plurality of shear rollers comprises a first shear roller adjacent to the second main roller in the second direction, and Wherein the second main roller and the first shear roller are configured to stretch the self-supporting film.

12. The apparatus according to claim 11, wherein the plurality of main rollers further comprises a third main roller adjacent to the second main roller in the first direction, and Wherein the second main roller and the third main roller are configured to stretch the self-supporting film.

13. The apparatus of claim 12, wherein the plurality of shear rollers further comprises a second shear roller adjacent to the third main roller in the second direction, and Wherein the third main roller and the second shear roller are configured to stretch the self-supporting film.

14. The device of claim 13, wherein the first shear roller and the second shear roller are located on opposite sides of the device in the second direction.

15. The apparatus of claim 13, wherein the second shear roller has a diameter greater than a diameter of the first shear roller.

16. The apparatus of claim 13, wherein the second shear roller is configured to rotate at a linear speed greater than a linear speed of the first shear roller.

17. The apparatus according to claim 13, wherein the plurality of main rollers further comprises a fourth main roller adjacent to the third main roller in the first direction, and Wherein the third main roller and the fourth main roller are configured to stretch the self-supporting film.

18. The apparatus of claim 17, wherein the plurality of shear rollers further comprises a third shear roller adjacent to the fourth main roller in the second direction, and Wherein the fourth main roller and the third shear roller are configured to stretch the self-supporting film.

19. The apparatus of claim 18, wherein the third shear roller has a diameter greater than a diameter of the second shear roller.

20. The apparatus of claim 18, wherein the third shear roller is configured to rotate at a linear speed greater than a linear speed of the second shear roller.

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