Dry electrode manufacturing device

Abstract

To provide a dry electrode manufacturing device that increases the elongation ratio of free-standing films while minimizing the overall equipment size.SOLUTION: A dry electrode manufacturing device according to an embodiment includes a feeder that supplies a fine powder, a plurality of main rollers that calendar the fine powder supplied from the feeder as a freestanding film and are arranged sequentially in a first direction, and a plurality of shear rollers that are adjacent to the plurality of main rollers in a second direction that intersects the first direction, sandwiching the freestanding film between them.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This description relates to a dry electrode manufacturing apparatus.

Background Art

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

[0003] Recently, the need for a dry electrode manufacturing apparatus for manufacturing a dry electrode for a secondary battery without using a solvent has been increasing.

[0004] Conventional dry electrode manufacturing apparatuses can manufacture a dry electrode by calendaring a fine powder containing an active material, a conductive material, and a binder as a free-standing film using a calendaring roll or the like, and laminating the free-standing film on a current collector.

[0005] Conventional dry electrode manufacturing apparatuses include a plurality of rollers for calendaring a fine powder as a free-standing film.

[0006] However, the plurality of rollers of a conventional dry electrode manufacturing apparatus include a plurality of forming rollers for forming a fine powder as a free-standing film, and in addition, a plurality of stretching rollers arranged in one direction for stretching the free-standing film, resulting in a problem that the overall size of the apparatus becomes large.

Summary of the Invention

Problems to be Solved by the Invention

[0007] It is desired to provide a dry electrode manufacturing apparatus that minimizes the overall size of the apparatus and at the same time improves the stretching ratio of the free-standing film.

Means for Solving the Problems

[0008] One embodiment provides a dry electrode manufacturing apparatus including a feeder that supplies fine powder, calendering the fine powder supplied from the feeder as a free-standing film using a plurality of main rollers sequentially arranged in a first direction, and a plurality of shear rollers adjacent to each other in a second direction intersecting the first direction with the free-standing film sandwiched therebetween.

[0009] Each of the plurality of shear rollers can stretch the free-standing film together with each of the plurality of main rollers.

[0010] The diameter of each of the plurality of shear rollers may be smaller than the diameter of each of the plurality of main rollers.

[0011] The diameter of each of the plurality of shear rollers may sequentially increase in the first direction.

[0012] The diameter of each of the plurality of shear rollers may sequentially decrease in the first direction.

[0013] The ratio of the diameter of each of the plurality of shear rollers to the diameter of each of the plurality of main rollers may be greater than 0.1 and less than 1.

[0014] The linear velocity of each of the plurality of shear rollers may be greater than the linear velocity of each of the plurality of main rollers.

[0015] The linear velocity of each of the plurality of shear rollers may sequentially increase in the first direction.

[0016] The distance between each of the plurality of main rollers and each of the plurality of shear rollers may sequentially decrease in the first direction.

[0017] The plurality of main rollers can include a first main roller to which the fine powder is supplied, and a second main roller that is adjacent to the first main roller in the first direction and that calendars the fine powder as the free-standing film together with the first main roller.

[0018] The plurality of shear rollers can include a first shear roller that is adjacent to the second main roller in the second direction and that first stretches the free-standing film together with the second main roller.

[0019] The plurality of main rollers can further include a third main roller that is adjacent to the second main roller in the first direction and that second stretches the free-standing film together with the second main roller.

[0020] The plurality of shear rollers can further include a second shear roller that is adjacent to the third main roller in the second direction and that third stretches the free-standing film together with the third main roller.

[0021] The second shear roller can be disposed on the side opposite to the first shear roller in the second direction.

[0022] The diameter of the second shear roller may be larger than the diameter of the first shear roller.

[0023] The linear velocity of the second shear roller may be larger than the linear velocity of the first shear roller.

[0024] The plurality of main rollers can further include a fourth main roller that is adjacent to the third main roller in the first direction and that fourth stretches the free-standing film together with the third main roller.

[0025] The plurality of shear rollers may further include a third shear roller that is adjacent to the fourth main roller in the second direction and, together with the third main roller, fifthly stretches the free-standing film.

[0026] The diameter of the third shear roller may be larger than the diameter of the second shear roller.

[0027] The linear velocity of the third shear roller may be larger than the linear velocity of the second shear roller.

Advantages of the Invention

[0028] According to one embodiment, there is provided a dry electrode manufacturing apparatus that minimizes the overall size of the apparatus and improves the stretching ratio of the free-standing film.

Brief Description of the Drawings

[0029]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0030] Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement them. The present invention can be realized in various different forms and is not limited to the embodiments described herein.

[0031] Also, throughout the specification, when a certain part refers to a certain component as "including", this means that other components can be further included, rather than excluding other components, unless otherwise stated to the contrary.

[0032] Hereinafter, with reference to FIG. 1, a dry electrode manufacturing apparatus according to an embodiment will be described.

[0033] The dry electrode manufacturing apparatus according to an embodiment may be an apparatus for manufacturing a dry electrode for a secondary battery, but is not limited thereto, and may also be an apparatus for manufacturing various known dry electrodes.

[0034] FIG. 1 is a side view showing a dry electrode manufacturing apparatus according to an embodiment.

[0035] Referring to FIG. 1, the dry electrode manufacturing apparatus 1000 according to an embodiment includes a plurality of rollers for calendaring the fine powder FS as a free-standing film FF, but is not limited thereto, and may further include various known rollers for laminating the free-standing film FF to a current collector.

[0036] The dry electrode manufacturing apparatus 1000 includes a feeder FE, a plurality of main rollers PMR, and a plurality of shear rollers PSR.

[0037] The feeder FE supplies the 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 is calendared as a free-standing film FF.

[0038] As an example, the fine powder FS contains various known active materials, conductive materials, and binders. The fine powder FS can include a metal oxide system, the conductive material can include carbon black, and the binder can include PTFE (polytetrafluoroethylene), but is not limited thereto. The fine powder FS can be produced by mixing the active material, conductive material, and binder as a mixture using various known mixing means, and fibrillizing the mixture as a dry powder fibrillized using various known fibrillization means, but is not limited thereto.

[0039] The feeder FE can include various known storage means for storing the fine powder FS and various known discharge means for supplying the fine powder FS to a plurality of main rollers PMR. The fine powder FS supplied from the feeder FE to the plurality of main rollers PMR is calendared as a free-standing film FF.

[0040] The plurality of main rollers PMR calendar the fine powder FS supplied from the feeder FE as a free-standing film FF. The plurality of main rollers PMR are sequentially arranged in the first direction X, and the fine powder FS is supplied between the plurality of main rollers PMR and calendared as a free-standing film FF. Here, the first direction X can include a horizontal direction, but is not limited thereto. Also, the second direction Y is a direction intersecting the first direction X, and the second direction Y can include a vertical direction, but is not limited thereto.

[0041] As an example, the plurality of main rollers PMR can calendar the fine powder FS by rolling and stretching it as a free-standing film FF, but is not limited thereto.

[0042] As another example, each of the plurality of main rollers PMR can rotate at the same linear velocity with respect to each other, but is not limited thereto, and can rotate at different linear velocities with respect to each other. Each of the plurality of main rollers PMR can rotate at a progressively faster linear velocity or a progressively slower linear velocity as it goes in the first direction X away from the feeder FE.

[0043] As still another example, each of the plurality of main rollers PMR can have the same diameter with respect to each other, but is not limited thereto, and can have different diameters with respect to each other. Each of the plurality of main rollers PMR can have a progressively smaller diameter or a progressively larger diameter as it goes in the first direction X away from the feeder FE.

[0044] As still another example, each of the plurality of main rollers PMR can include a surface treatment layer such as a concavo-convex structure layer or a coating layer for improving the bonding force with the free-standing film FF. Each of the plurality of main rollers PMR can include the same surface treatment layer or different surface treatment layers with respect to each other.

[0045] In one embodiment, the plurality of main rollers PMR includes four main rollers PMR, but is not limited thereto, and in other embodiments, the plurality of main rollers PMR can include two, three, or five or more main rollers PMR.

[0046] The plurality of main rollers PMR includes a first main roller MR1, a second main roller MR2, a third main roller MR3, and a fourth main roller MR4.

[0047] The first main roller MR1 is adjacent to the feeder FE. The first main roller MR1 rotates in a first rotation direction. The first rotation direction in which the first main roller MR1 rotates includes the clockwise direction, but is not limited thereto, and can include the counterclockwise direction. The first main roller MR1 calendars the fine powder FS supplied from the feeder FE with the second main roller MR2 as a free-standing film FF.

[0048] The second main roller MR2 is adjacent to the first main roller MR1 in the first direction X. The second main roller MR2 rotates in a second rotation direction. The second rotation direction in which the second main roller MR2 rotates includes, but is not limited to, the counterclockwise direction and can include the clockwise direction. The second main roller MR2 calendars the fine powder FS supplied from the feeder FE together with the first main roller MR1 as a free-standing film FF.

[0049] The third main roller MR3 is adjacent to the second main roller MR2 in the first direction X. The third main roller MR3 rotates in a first rotation direction. The first rotation direction in which the third main roller MR3 rotates includes, but is not limited to, the clockwise direction and can include the counterclockwise direction. The third main roller MR3 second-extends the free-standing film FF together with the second main roller MR2. The third main roller MR3 fourth-extends the free-standing film FF together with the fourth main roller MR4.

[0050] The fourth main roller MR4 is adjacent to the third main roller MR3 in the first direction X. The fourth main roller MR4 rotates in a second rotation direction. The second rotation direction in which the fourth main roller MR4 rotates includes, but is not limited to, the counterclockwise direction and can include the clockwise direction. The fourth main roller MR4 fourth-extends the free-standing film FF together with the third main roller MR3.

[0051] A plurality of shear rollers PSR are positioned adjacent to the plurality of main rollers PMR in a second direction Y. The second direction Y is a direction that intersects the first direction X, and the second direction Y can include, but is not limited to, the vertical direction.

[0052] A plurality of shear rollers PSR are adjacent to a plurality of main rollers PMR in a second direction Y intersecting a first direction X with a free-standing film FF sandwiched therebetween. Each of the plurality of shear rollers PSR extends the free-standing film in a first extension and a third extension together with each of the plurality of main rollers PMR.

[0053] 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 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 exceed 0.1 and be less than 1, but is not limited thereto. The linear velocity of each of the plurality of shear rollers PSR is greater than the linear velocity of each of the plurality of main rollers PMR. The linear velocity of each of the plurality of shear rollers PSR may increase sequentially as it goes in the first direction X.

[0054] As an example, each of the plurality of shear rollers PSR may rotate at the same linear velocity with respect to each other, but is not limited thereto, and may rotate at different linear velocities with respect to each other. Each of the plurality of shear rollers PSR may rotate at a gradually increasing linear velocity or a gradually decreasing linear velocity as it goes in the first direction X away from the feeder FE.

[0055] As another example, each of the plurality of shear rollers PSR may have the same diameter with respect to each other, but is not limited thereto, and may have different diameters with respect to each other. Each of the plurality of shear rollers PSR may have a gradually decreasing diameter or a gradually increasing diameter as it goes in the first direction X away from the feeder FE.

[0056] As still another example, each of the plurality of shear rollers PSR may include a surface treatment layer such as a concavo-convex structure layer or a coating layer for improving the bonding force with the free-standing film FF. Each of the plurality of shear rollers PSR may include the same surface treatment layer or different surface treatment layers with respect to each other.

[0057] As another example, the plurality of shear rollers PSR can have the same diameter as the plurality of main rollers PMR, but is not limited thereto, and can have a diameter different from that of the plurality of main rollers PMR.

[0058] In one embodiment, the plurality of shear rollers PSR includes three shear rollers PSR, but is not limited thereto. In other embodiments, the plurality of shear rollers PSR can include two, four, or five or more shear rollers PSR. Also, the shear roller PSR can include one shear roller.

[0059] The plurality of shear rollers PSR includes a first shear roller SR1, a second shear roller SR2, and a third shear roller SR3.

[0060] The first shear roller SR1 is adjacent to the second main roller MR2 in the second direction Y. The first shear roller SR1 rotates in a first rotation direction that is opposite to the rotation direction of the second main roller MR2. The first rotation direction in which the first shear roller SR1 rotates includes the clockwise direction, but is not limited thereto, and can include the counterclockwise direction. The first shear roller SR1 and the second main roller MR2 stretch the fleece film FF in a first manner. The first shear roller SR1 has a diameter smaller than that of the second main roller MR2. The first shear roller SR1 has a linear velocity greater than that of the second main roller MR2.

[0061] As an example, the first shear roller SR1 can include a plurality of sub-rollers adjacent to each other, but is not limited thereto.

[0062] The second shear roller SR2 is adjacent to the third main roller MR3 in the second direction Y. The second shear roller SR2 is located on the opposite side in the second direction Y compared to the first shear roller SR1 with respect to the third main roller MR3 as the center. The second shear roller SR2 rotates in a second rotation direction which is opposite to the rotation direction of the third main roller MR3. The second rotation direction in which the second shear roller SR2 rotates includes, but is not limited to, the counterclockwise direction and can include the clockwise direction. The second shear roller SR2, together with the third main roller MR3, thirdly extends the fleece film FF. The second shear roller SR2 has a diameter smaller than that of the third main roller MR3. The second shear roller SR2 has a linear velocity greater than that of the third main roller MR3. The second shear roller SR2 may have the same diameter as the first shear roller SR1, but is not limited thereto. The second shear roller SR2 may have a linear velocity greater than that of the first shear roller SR1, but is not limited thereto.

[0063] As an example, the second shear roller SR2 can include a plurality of sub-rollers adjacent to each other, but is not limited thereto.

[0064] The third shear roller SR3 is adjacent to the fourth main roller MR4 in the second direction Y. The third shear roller SR3 is located on the opposite side of the second shear roller SR2 in the second direction Y with respect to the fourth main roller MR4. The third shear roller SR3 rotates in a first rotation direction, which is the direction opposite to the rotation direction of the fourth main roller MR4. The first rotation direction in which the third shear roller SR3 rotates includes, but is not limited to, the clockwise direction and can include the counterclockwise direction. The third shear roller SR3, together with the fourth main roller MR4, fifthly stretches the free-standing film FF. The third shear roller SR3 has a diameter smaller than that of the fourth main roller MR4. The third shear roller SR3 has a linear velocity greater than that of the fourth main roller MR4. The third shear roller SR3 may have the same diameter as the second shear roller SR2, but is not limited thereto. The third shear roller SR3 has a linear velocity greater than that of the second shear roller SR2, but is not limited thereto.

[0065] As an example, the third shear roller SR3 can include a plurality of sub-rollers adjacent to each other, but is not limited thereto.

[0066] In a dry electrode manufacturing apparatus 1000 according to an embodiment, the fine powder FS supplied from the feeder FE is calendared as a free-standing film FF between the first main roller MR1 and the second main roller MR2, and the calendared free-standing film FF is firstly stretched between the second main roller MR2 and the first shear roller SR1, secondly stretched between the second main roller MR2 and the third main roller MR3, thirdly stretched between the third main roller MR3 and the second shear roller SR2, fourthly stretched between the third main roller MR3 and the fourth main roller MR4, and fifthly stretched between the fourth main roller MR4 and the third shear roller SR3. The free-standing film FF can be transferred onto the surfaces of the second main roller MR2, the third main roller MR3, and the fourth main roller MR4.

[0067] As an example, a dry electrode manufacturing apparatus 1000 according to an embodiment includes a plurality of main rollers PMR arranged in the first direction X and a plurality of shear rollers PSR adjacent to the plurality of main rollers PMR with a free-standing film FF sandwiched therebetween, thereby minimizing the overall size of the apparatus and at the same time improving the elongation rate of the free-standing film FF.

[0068] As another example, in a dry electrode manufacturing apparatus 1000 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 shearing force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, thereby improving the elongation rate of the free-standing film FF.

[0069] As still another example, in a dry electrode manufacturing apparatus 1000 according to an embodiment, since the linear velocity of each of the plurality of shear rollers PSR is greater than the linear velocity of each of the plurality of main rollers PMR, the shearing force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, thereby improving the elongation rate of the free-standing film FF.

[0070] A dry electrode manufacturing apparatus 1000 is provided that minimizes the overall size of the apparatus and at the same time improves the elongation rate of the free-standing film FF.

[0071] Hereinafter, a dry electrode manufacturing apparatus according to another embodiment will be described with reference to FIG. 2. Hereinafter, the parts different from the dry electrode manufacturing apparatus according to the above-described embodiment will be described.

[0072] FIG. 2 is a side view showing a dry electrode manufacturing apparatus according to another embodiment.

[0073] Referring to FIG. 2, a dry electrode manufacturing apparatus 1000 according to another embodiment includes a feeder FE, a plurality of main rollers PMR, and a plurality of shear rollers PSR. The diameter of each of the plurality of shear rollers PSR sequentially increases in the first direction X. The plurality of shear rollers PSR includes a first shear roller SR1, a second shear roller SR2, and a third shear roller SR3 whose diameters sequentially increase in the first direction X away from the feeder FE. The diameter of the second shear roller SR2 is larger than the diameter of the first shear roller SR1, and the diameter of the third shear roller SR3 is larger than the diameter of the second shear roller SR2.

[0074] As an example, a dry electrode manufacturing apparatus 1000 according to another embodiment includes a plurality of main rollers PMR arranged in the first direction X and a plurality of shear rollers PSR adjacent to the plurality of main rollers PMR with a free-standing film FF sandwiched therebetween, thereby minimizing the overall size of the apparatus and improving the elongation rate of the free-standing film FF at the same time.

[0075] As another example, a dry electrode manufacturing apparatus 1000 according to another embodiment improves the shear force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR because 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, thereby improving the elongation rate of the free-standing film FF.

[0076] As still another example, a dry electrode manufacturing apparatus 1000 according to another embodiment improves the shear force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR because the linear velocity of each of the plurality of shear rollers PSR is larger than the linear velocity of each of the plurality of main rollers PMR, thereby improving the elongation rate of the free-standing film FF.

[0077] As another example, in the dry electrode manufacturing apparatus 1000 according to another embodiment, the diameter of each of the plurality of shear rollers PSR gradually increases in the first direction X, so that the shearing force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, thereby improving the stretching rate of the free-standing film FF.

[0078] A dry electrode manufacturing apparatus 1000 is provided that minimizes the overall size of the apparatus and at the same time improves the stretching rate of the free-standing film FF.

[0079] Hereinafter, a dry electrode manufacturing apparatus according to another embodiment will be described with reference to FIG. 3. Hereinafter, the parts different from the dry electrode manufacturing apparatus according to the above-described one embodiment will be described.

[0080] FIG. 3 is a side view showing a dry electrode manufacturing apparatus according to another embodiment.

[0081] Referring to FIG. 3, the dry electrode manufacturing apparatus 1000 according to another embodiment includes a feeder FE, a plurality of main rollers PMR, and a plurality of shear rollers PSR.

[0082] The diameter of each of the plurality of shear rollers PSR gradually decreases in the first direction X. The plurality of shear rollers PSR includes a first shear roller SR1, a second shear roller SR2, and a third shear roller SR3 whose diameters gradually decrease in the first direction X away from the feeder FE. The diameter of the second shear roller SR2 is smaller than the diameter of the first shear roller SR1, and the diameter of the third shear roller SR3 is smaller than the diameter of the second shear roller SR2.

[0083] As an example, the dry electrode manufacturing apparatus 1000 according to another embodiment includes a plurality of main rollers PMR arranged in the first direction X and a plurality of shear rollers PSR adjacent to the plurality of main rollers PMR with a free-standing film FF sandwiched therebetween, thereby minimizing the overall size of the apparatus and improving the elongation rate of the free-standing film FF at the same time.

[0084] As another example, in the dry electrode manufacturing apparatus 1000 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 shearing force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, so that the elongation rate of the free-standing film FF is improved.

[0085] As still another example, in the dry electrode manufacturing apparatus 1000 according to another embodiment, since the linear velocity of each of the plurality of shear rollers PSR is greater than the linear velocity of each of the plurality of main rollers PMR, the shearing force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, so that the elongation rate of the free-standing film FF is improved.

[0086] As still another example, in the dry electrode manufacturing apparatus 1000 according to another embodiment, since the diameter of each of the plurality of shear rollers PSR sequentially decreases in the first direction X, the shearing force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, so that the elongation rate of the free-standing film FF is improved.

[0087] There is provided a dry electrode manufacturing apparatus 1000 that minimizes the overall size of the apparatus and improves the elongation rate of the free-standing film FF at the same time.

[0088] Hereinafter, with reference to FIG. 4, experimental examples 1, 2, 3, and 4 for confirming the effects of the dry electrode manufacturing apparatus according to the aforementioned embodiment, the dry electrode manufacturing apparatus according to other embodiments, and the dry manufacturing apparatus according to other embodiments will be described. Experimental examples 1, 2, 3, and 4 were conducted using the aforementioned dry manufacturing apparatus.

[0089] FIG. 4 is a table showing the experimental results of experimental examples 1, 2, 3, and 4.

[0090] In FIG. 4, SR1 DR means the diameter ratio of the first shear roller to the diameter of any one of the plurality of main rollers, SR2 DR means the diameter ratio of the second shear roller to the diameter of any one of the plurality of main rollers, SR3 DR means the diameter ratio of the third shear roller to the diameter of any one of the plurality of main rollers, SR1 LVR means the linear velocity ratio of the first shear roller to the linear velocity of any one of the plurality of main rollers, SR2 LVR means the linear velocity ratio of the second shear roller to the linear velocity of any one of the plurality of main rollers, SR3 LVR means the linear velocity ratio of the third shear roller to the linear velocity of any one of the plurality of main rollers, and Film T means the thickness of the free-standing film that has passed through the fourth main roller and the third shear roller.

[0091] Referring to FIG. 4, it was confirmed that in the experimental results of experimental examples 1EX1, 2EX2, 3EX3, and 4EX4, the smaller the diameter of the plurality of shear rollers compared to the plurality of main rollers and the larger the linear velocity of the plurality of shear rollers compared to the plurality of main rollers, the thinner the thickness of the free-standing film. A dry electrode manufacturing apparatus for improving the elongation rate is provided.

[0092] Hereinafter, a dry electrode manufacturing apparatus according to another embodiment will be described with reference to FIG. 5. Hereinafter, the parts different from the dry electrode manufacturing apparatus according to the aforementioned embodiment will be described.

[0093] FIG. 5 is a side view showing a dry electrode manufacturing apparatus according to another embodiment.

[0094] Referring to FIG. 5, a dry electrode manufacturing apparatus 1000 according to another embodiment includes a feeder FE, a plurality of main rollers PMR, and a plurality of shear rollers PSR.

[0095] The distance between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR sequentially decreases in the first direction X.

[0096] In the dry electrode manufacturing apparatus 1000 according to another embodiment, the fine powder FS supplied from the feeder FE is calendared as a free-standing film FF between the first main roller MR1 and the second main roller MR2, and the calendared free-standing film FF is first stretched at a first interval G1 between the second main roller MR2 and the first shear roller SR1, second stretched at a second interval G2 between the second main roller MR2 and the third main roller MR3, third stretched at a third interval G3 between the third main roller MR3 and the second shear roller SR2, fourth stretched at a fourth interval G4 between the third main roller MR3 and the fourth main roller MR4, and fifth stretched at a fifth interval G5 between the fourth main roller MR4 and the third shear roller SR3. The first interval G1, the second interval G2, the third interval G3, the fourth interval G4, and the fifth interval G5, which are the distances between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, sequentially decrease in the first direction X away from the feeder FE.

[0097] As an example, the dry electrode manufacturing apparatus 1000 according to another embodiment includes a plurality of main rollers PMR arranged in the first direction X and a plurality of shear rollers PSR adjacent to the plurality of main rollers PMR with the free-standing film FF therebetween, thereby minimizing the overall size of the apparatus and improving the stretching ratio of the free-standing film FF.

[0098] As another example, in the dry electrode manufacturing apparatus 1000 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 shearing force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, thereby improving the stretching ratio of the free-standing film FF.

[0099] As yet another example, in the dry electrode manufacturing apparatus 1000 according to another embodiment, since the linear velocity of each of the plurality of shear rollers PSR is greater than the linear velocity of each of the plurality of main rollers PMR, the shearing force applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, thereby improving the stretching ratio of the free-standing film FF.

[0100] As yet another example, in the dry electrode manufacturing apparatus 1000 according to another embodiment, since the distance between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR sequentially decreases as going in the first direction X, the pressure applied to the free-standing film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR is improved, thereby improving the stretching ratio of the free-standing film FF.

[0101] There is provided a dry electrode manufacturing apparatus 1000 that minimizes the overall size of the apparatus and at the same time improves the stretching ratio of the free-standing film FF.

[0102] Hereinafter, with reference to FIG. 6, Experimental Examples 5, 6, and 7 for confirming the effects of the dry electrode manufacturing apparatus according to the above-described other embodiments will be described. Experimental Examples 5, 6, and 7 were conducted using the dry electrode manufacturing apparatus according to the above-described other embodiments.

[0103] FIG. 6 is a table showing the experimental results of Experimental Examples 5, 6, and 7.

[0104] In FIG. 6, each of G1, G2, G3, G4, and G5 means each of the first interval, the second interval, the third interval, the fourth interval, and the fifth interval of the dry manufacturing apparatus according to the other embodiments described above, and Film T means the thickness of the free-standing film that has passed through the fourth main roller and the third shear roller.

[0105] Referring to FIG. 6, it was confirmed that the thickness of the free-standing film becomes thinner as the intervals between each of the plurality of main rollers and each of the plurality of shear rollers sequentially decrease in the first direction in the experimental results of Experimental Example 5 EX5, Experimental Example 6 EX6, and Experimental Example 7 EX7. A dry electrode manufacturing apparatus for improving the elongation rate is provided.

[0106] Although the embodiments of the present invention have been described in detail above, the scope of the rights of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims also belong to the scope of the rights of the present invention.

Explanation of Signs

[0107] FE feeder PMR main roller PSR shear roller

Claims

1. A feeder for supplying fine powder; A plurality of main rollers arranged sequentially in a first direction for calendering the fine powder provided from the feeder into a free-standing film; and a plurality of shear rollers adjacent to the plurality of main rollers in a second direction intersecting the first direction with the free-standing film sandwiched therebetween; A dry electrode manufacturing apparatus comprising:

2. The dry electrode manufacturing apparatus according to claim 1 , wherein each of the plurality of shear rollers stretches the freestanding film together with each of the plurality of main rollers.

3. The dry electrode manufacturing apparatus according to claim 1 , wherein a diameter of each of the plurality of shear rollers is smaller than a diameter of each of the plurality of main rollers.

4. The apparatus of claim 3 , wherein the diameters of the shear rollers each become larger in the first direction.

5. The apparatus of claim 3 , wherein the diameters of the shear rollers are successively smaller in the first direction.

6. 4. The dry electrode manufacturing apparatus according to claim 3, wherein a ratio of a diameter of each of the plurality of shear rollers to a diameter of each of the plurality of main rollers is greater than 0.1 and less than 1.

7. The dry electrode manufacturing apparatus according to claim 1 , wherein a linear velocity of each of the plurality of shear rollers is greater than a linear velocity of each of the plurality of main rollers.

8. The apparatus of claim 7 , wherein the linear speeds of the shear rollers are increased in the first direction.

9. 2 . The apparatus of claim 1 , wherein the intervals between the main rollers and the shear rollers are successively decreased in the first direction. 3 .

10. The plurality of main rollers include 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 calendering the fine powder into the free-standing film together with the first main roller; The dry electrode manufacturing apparatus according to claim 1 .

11. The plurality of shear rollers include a first shear roller adjacent to the second main roller in the second direction and performing a first stretching of the freestanding film together with the second main roller; The dry electrode manufacturing apparatus according to claim 10 .

12. The plurality of main rollers include a third main roller adjacent to the second main roller in the first direction and performing a second stretching on the freestanding film together with the second main roller; The dry electrode manufacturing apparatus according to claim 11 , further comprising:

13. The plurality of shear rollers include a second shear roller adjacent to the third main roller in the second direction and performing a third stretching of the freestanding film together with the third main roller; The dry electrode manufacturing apparatus of claim 12 , further comprising:

14. The dry electrode manufacturing apparatus according to claim 13 , wherein the second shear roller is located on an opposite side to the first shear roller in the second direction.

15. The dry electrode manufacturing apparatus according to claim 13 , wherein the diameter of the second shear roller is larger than the diameter of the first shear roller.

16. The dry electrode manufacturing apparatus according to claim 13 , wherein a linear velocity of the second shear roller is greater than a linear velocity of the first shear roller.

17. The plurality of main rollers include a fourth main roller adjacent to the third main roller in the first direction and performing a fourth stretching of the freestanding film together with the third main roller; The dry electrode manufacturing apparatus of claim 13 , further comprising:

18. The plurality of shear rollers include a third shear roller adjacent to the fourth main roller in the second direction and for fifthly stretching the freestanding film together with the third main roller; The dry electrode manufacturing apparatus of claim 17, further comprising:

19. The apparatus for manufacturing a dry electrode according to claim 18, wherein the diameter of the third shear roller is larger than the diameter of the second shear roller.

20. The dry electrode manufacturing apparatus according to claim 18 , wherein a linear velocity of the third shear roller is greater than a linear velocity of the second shear roller.

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