Dry electrode manufacturing equipment

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 technology]

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

[0003] Recently, there has been an increasing need for a dry electrode manufacturing apparatus for manufacturing dry electrodes for secondary batteries without using a solvent.

[0004] Conventional dry electrode manufacturing equipment can manufacture dry electrodes by calendering fine powder containing an active material, a conductive material, and a binder into a free-standing film using a calendering roll or the like, and then laminating the free-standing film onto a current collector.

[0005] Conventional dry electrode manufacturing equipment includes multiple rollers that calender a fine powder into a free-standing film.

[0006] However, the multiple rollers of the conventional dry electrode manufacturing apparatus include multiple forming rollers that form the fine powder into a free-standing film, as well as multiple stretching rollers that are arranged in one direction and stretch the free-standing film, which results in a problem of an increased overall size of the apparatus. Summary of the Invention [Problem to be solved by the invention]

[0007] It would be desirable to provide a dry electrode manufacturing apparatus that minimizes the overall size of the apparatus while simultaneously increasing the draw ratio of freestanding films. [Means for solving the problem]

[0008] One embodiment provides a dry electrode manufacturing apparatus including a feeder that supplies fine powder, a plurality of main rollers that calender the fine powder supplied from the feeder as a free-standing film and are sequentially arranged in a first direction, and a plurality of shear rollers that are adjacent to the plurality of main rollers and that intersect the first direction, sandwiching the free-standing film therebetween.

[0009] Each of the plurality of shear rollers can stretch the freestanding 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 diameters of the plurality of shear rollers may increase sequentially in the first direction.

[0012] The diameters of the plurality of shear rollers may be successively smaller in the first direction.

[0013] A ratio of a diameter of each of the plurality of shear rollers to a 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 speed of each of the plurality of shear rollers may be increased in the first direction.

[0016] The intervals between the main rollers and the shear rollers may become smaller in the first direction.

[0017] 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 the first direction and calendaring the fine powder as the freestanding film together with the first main roller.

[0018] The plurality of shear rollers may 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.

[0019] The plurality of main rollers may further include a third main roller adjacent to the second main roller in the first direction and performing a second stretching of the freestanding film together with the second main roller.

[0020] The plurality of shear rollers may further 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.

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

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

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

[0024] The plurality of main rollers may further 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.

[0025] The plurality of shear rollers may further include a third shear roller adjacent to the fourth main roller in the second direction and stretching the freestanding film in a fifth direction together with the third main roller.

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

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

[0028] According to one embodiment, a dry electrode manufacturing apparatus is provided that minimizes the overall size of the apparatus while simultaneously improving the elongation rate of a free-standing film. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a side view showing a dry electrode manufacturing apparatus according to an embodiment; [Figure 2] FIG. 10 is a side view showing a dry electrode manufacturing apparatus according to another embodiment. [Figure 3] FIG. 10 is a side view showing a dry electrode manufacturing apparatus according to another embodiment. [Figure 4] 1 is a table showing the experimental results of Experimental Examples 1, 2, 3, and 4. [Figure 5] FIG. 10 is a side view showing a dry electrode manufacturing apparatus according to another embodiment. [Figure 6] 10 is a table showing the experimental results of Experimental Examples 5, 6, and 7. DETAILED DESCRIPTION OF THE INVENTION

[0030] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, in which: FIG. 1 is a block diagram of a semiconductor device according to an embodiment of the present invention;

[0031] Also, throughout the specification, when a part is said to "comprise" a certain element, this means that it may further include other elements, not excluding other elements, unless otherwise specified.

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

[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 be an apparatus for manufacturing various known dry electrodes.

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

[0035] Referring to FIG. 1, a dry electrode manufacturing apparatus 1000 according to an embodiment includes a plurality of rollers for calendering a fine powder FS into 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 main rollers PMR. The fine powder FS supplied from the feeder FE to the main rollers PMR is calendered as a free-standing film FF.

[0038] For example, the fine powder FS may contain various known active materials, conductive materials, and binders. The fine powder FS may include, but is not limited to, metal oxides, the conductive material may include carbon black, and the binder may include, but is not limited to, PTFE (polytetrafluoroethylene). The fine powder FS may be produced by mixing the active material, conductive material, and binder using various known mixing means to form a mixture, and then fibrillating the mixture using various known fiberization means to form a dry powder.

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

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

[0041] As an example, but not limited to, multiple main rollers PMR can roll and stretch fine powder FS to calender it into a free-standing film FF.

[0042] As another example, each of the main rollers PMR may rotate at the same linear velocity, but is not limited thereto, and may rotate at different linear velocities. Each of the main rollers PMR may rotate at a gradually faster linear velocity or a gradually slower linear velocity as it moves in the first direction X away from the feeder FE.

[0043] As another example, the main rollers PMR may have the same diameter, but are not limited to this, and may have different diameters. The main rollers PMR may have gradually smaller or larger diameters as they move in the first direction X away from the feeder FE.

[0044] As another example, each of the main rollers PMR may include a surface treatment layer such as a concavo-convex structure layer or a coating layer to improve adhesion to the freestanding film FF. Each of the main rollers PMR may include the same surface treatment layer or different surface treatment layers.

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

[0046] The plurality of main rollers PMR include 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, which may include, but is not limited to, a clockwise direction, and may also include a counterclockwise direction. The first main roller MR1, together with the second main roller MR2, calenders the fine powder FS supplied from the feeder FE into a freestanding 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, which may include, but is not limited to, a counterclockwise direction, and may also include a clockwise direction. The second main roller MR2, together with the first main roller MR1, calenders the fine powder FS supplied from the feeder FE into a freestanding 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 of the third main roller MR3 includes, but is not limited to, a clockwise direction, and can also include a counterclockwise direction. The third main roller MR3, together with the second main roller MR2, performs a second stretching of the freestanding film FF. The third main roller MR3, together with the fourth main roller MR4, performs a fourth stretching of the freestanding film FF.

[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 of the fourth main roller MR4 includes, but is not limited to, a counterclockwise direction, and can also include a clockwise direction. The fourth main roller MR4, together with the third main roller MR3, performs a fourth stretching of the freestanding film FF.

[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 intersecting the first direction X, and the second direction Y may include, but is not limited to, a vertical direction.

[0052] The multiple shear rollers PSR are adjacent to the multiple main rollers PMR in a second direction Y intersecting the first direction X, with the freestanding film FF sandwiched between them. Each of the multiple shear rollers PSR, together with each of the multiple main rollers PMR, first stretches and third stretches the freestanding film.

[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 be, but is not limited to, greater than 0.1 and less than 1. 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 in the first direction X.

[0054] For example, the plurality of shear rollers PSR may rotate at the same linear velocity, but are not limited thereto, and may rotate at different linear velocities. The plurality of shear rollers PSR may rotate at progressively faster or slower linear velocities in the first direction X, which is farther from the feeder FE.

[0055] As another example, the plurality of shear rollers PSR may have the same diameter, but are not limited to this, and may have different diameters. The plurality of shear rollers PSR may have gradually smaller or larger diameters as they move in the first direction X away from the feeder FE.

[0056] As another example, each of the plurality of shear rollers PSR may include a surface treatment layer such as a textured layer or a coating layer to improve adhesion to the freestanding film FF. Each of the plurality of shear rollers PSR may include the same surface treatment layer or different surface treatment layers.

[0057] As another example, the plurality of shear rollers PSR may have the same diameter as the plurality of main rollers PMR, but is not limited thereto, and may have a different diameter from 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 to this, and in other embodiments, the plurality of shear rollers PSR may include two, four, five or more shear rollers PSR, and the shear roller PSR may 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, which is opposite to the rotation direction of the second main roller MR2. The first rotation direction of the first shear roller SR1 includes, but is not limited to, a clockwise direction, and can also include a counterclockwise direction. The first shear roller SR1, together with the second main roller MR2, performs a first stretching of the freestanding film FF. The first shear roller SR1 has a smaller diameter than the diameter of the second main roller MR2. The first shear roller SR1 has a linear velocity greater than the linear velocity of the second main roller MR2.

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

[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 of the third main roller MR3 in the second direction Y from the first shear roller SR1. The second shear roller SR2 rotates in a second rotational direction, which is opposite to the rotational direction of the third main roller MR3. The second rotational direction of the second shear roller SR2 includes, but is not limited to, a counterclockwise direction, and can also include a clockwise direction. The second shear roller SR2, together with the third main roller MR3, performs a third stretching of the freestanding film FF. The second shear roller SR2 has a smaller diameter than the diameter of the third main roller MR3. The second shear roller SR2 has a linear velocity higher than the linear velocity 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 to this. The second shear roller SR2 has a linear velocity higher than the linear velocity of the first shear roller SR1, but is not limited to this.

[0063] By way of example, but not limitation, the second shear roller SR2 may include a plurality of sub-rollers adjacent to each other.

[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 fourth main roller MR4 in the second direction Y compared to the second shear roller SR2. The third shear roller SR3 rotates in a first rotation direction, which is opposite to the rotation direction of the fourth main roller MR4. The first rotation direction of the third shear roller SR3 includes, but is not limited to, a clockwise direction, and can also include a counterclockwise direction. The third shear roller SR3, together with the fourth main roller MR4, performs a fifth stretching of the freestanding 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, but not limited to, the third shear roller SR3 may include a plurality of sub-rollers adjacent to each other.

[0066] In one embodiment of the dry electrode manufacturing apparatus 1000, fine powder FS supplied from a feeder FE is calendered between a first main roller MR1 and a second main roller MR2 to form a freestanding film FF, and the calendered freestanding film FF is first stretched between the second main roller MR2 and a first shear roller SR1, second stretched between the second main roller MR2 and a third main roller MR3, third stretched between the third main roller MR3 and a second shear roller SR2, fourth stretched between the third main roller MR3 and a fourth main roller MR4, and fifth stretched between the fourth main roller MR4 and a third shear roller SR3. The freestanding film FF can be transferred to the surfaces of the second main roller MR2, the third main roller MR3, and the fourth main roller MR4.

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

[0068] As another example, in the dry electrode manufacturing apparatus 1000 according to one embodiment, 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 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, thereby improving the stretching rate of the free-standing film FF.

[0069] As another example, in the dry electrode manufacturing apparatus 1000 according to one 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, thereby increasing the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0070] A dry electrode manufacturing apparatus 1000 is provided that minimizes the overall size of the apparatus while improving 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, differences 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] 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 diameters of the shear rollers PSR increase sequentially in a first direction X. The shear rollers PSR include a first shear roller SR1, a second shear roller SR2, and a third shear roller SR3, each of which has a diameter that increases sequentially in the first direction X, i.e., 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 a 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 while improving the elongation rate of the free-standing film FF.

[0075] 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 is smaller than the diameter of each of the plurality of main rollers PMR, thereby improving the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0076] As another example, in the dry electrode manufacturing apparatus 1000 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, thereby increasing the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0077] As another example, in the dry electrode manufacturing apparatus 1000 according to another embodiment, the diameters of the plurality of shear rollers PSR gradually increase in the first direction X, thereby improving the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0078] A dry electrode manufacturing apparatus 1000 is provided that minimizes the overall size of the apparatus while improving the elongation 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, differences from the dry electrode manufacturing apparatus according to the above-described 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, 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.

[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, which is farther 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, a dry electrode manufacturing apparatus 1000 according to another embodiment includes a plurality of main rollers PMR arranged in a 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 while improving the elongation rate of the free-standing film FF.

[0084] 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 is smaller than the diameter of each of the plurality of main rollers PMR, thereby improving the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0085] As another example, in the dry electrode manufacturing apparatus 1000 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, thereby increasing the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0086] As another example, in the dry electrode manufacturing apparatus 1000 according to another embodiment, the diameters of the plurality of shear rollers PSR gradually decrease in the first direction X, thereby improving the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretch rate of the freestanding film FF.

[0087] A dry electrode manufacturing apparatus 1000 is provided that minimizes the overall size of the apparatus while improving the elongation rate of the free-standing film FF.

[0088] Hereinafter, experimental examples 1, 2, 3, and 4 will be described with reference to Fig. 4, which confirm the effects of the dry electrode manufacturing apparatus according to the above-described embodiment, the dry electrode manufacturing apparatus according to another embodiment, and the dry manufacturing apparatus according to another embodiment. Experimental examples 1, 2, 3, and 4 were performed using the above-described 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 ratio of the diameter of the first shear roller to the diameter of any one of the main rollers, SR2 DR means the ratio of the diameter of the second shear roller to the diameter of any one of the main rollers, SR3 DR means the ratio of the diameter of the third shear roller to the diameter of any one of the main rollers, SR1 LVR means the ratio of the linear velocity of the first shear roller to the linear velocity of any one of the main rollers, SR2 LVR means the ratio of the linear velocity of the second shear roller to the linear velocity of any one of the main rollers, SR3 LVR means the ratio of the linear velocity of the third shear roller to the linear velocity of any one of the main rollers, and Film T means the thickness of the freestanding film after passing through the fourth main roller and the third shear roller.

[0091] 4, the experimental results of Experimental Examples 1EX1, 2EX2, 3EX3, and 4EX4 confirmed that the thickness of the free-standing film was thinner when the diameter of the plurality of shear rollers was smaller than that of the plurality of main rollers and when the linear velocity of the plurality of shear rollers was higher than that of the plurality of main rollers. A dry electrode manufacturing apparatus that improves the elongation ratio is provided.

[0092] Hereinafter, a dry electrode manufacturing apparatus according to another embodiment will be described with reference to Fig. 5. Hereinafter, differences from the dry electrode manufacturing apparatus according to the above-described 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 intervals between each of the main rollers PMR and each of the shear rollers PSR become successively smaller in the first direction X.

[0096] In another embodiment of the dry electrode manufacturing apparatus 1000, fine powder FS supplied from a feeder FE is calendered as a freestanding film FF between a first main roller MR1 and a second main roller MR2, and the calendered freestanding film FF is first stretched at a first gap G1 between the second main roller MR2 and a first shear roller SR1, second stretched at a second gap G2 between the second main roller MR2 and a third main roller MR3, third stretched at a third gap G3 between the third main roller MR3 and the second shear roller SR2, fourth stretched at a fourth gap G4 between the third main roller MR3 and a fourth main roller MR4, and fifth stretched at a fifth gap G5 between the fourth main roller MR4 and the third shear roller SR3. The first distance G1, the second distance G2, the third distance G3, the fourth distance G4, and the fifth distance G5 between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR become successively smaller as they move in the first direction X away from the feeder FE.

[0097] As an example, a dry electrode manufacturing apparatus 1000 according to another embodiment includes a plurality of main rollers PMR arranged in a 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 while improving the elongation rate of the free-standing film FF.

[0098] 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 is smaller than the diameter of each of the plurality of main rollers PMR, thereby improving the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0099] As another example, in the dry electrode manufacturing apparatus 1000 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, thereby increasing the shear force applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0100] As another example, in the dry electrode manufacturing apparatus 1000 according to another embodiment, the distance between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR gradually decreases in the first direction X, thereby increasing the pressure applied to the freestanding film FF stretched between each of the plurality of main rollers PMR and each of the plurality of shear rollers PSR, thereby improving the stretching rate of the freestanding film FF.

[0101] A dry electrode manufacturing apparatus 1000 is provided that minimizes the overall size of the apparatus while improving the elongation rate of the free-standing film FF.

[0102] Hereinafter, Experimental Examples 5, 6, and 7 will be described with reference to Fig. 6, in order to confirm the effects of the dry electrode manufacturing apparatus according to the other embodiment. Experimental Examples 5, 6, and 7 were carried out using the dry electrode manufacturing apparatus according to the other embodiment.

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

[0104] In FIG. 6, G1, G2, G3, G4, and G5 respectively represent the first gap, second gap, third gap, fourth gap, and fifth gap of the dry manufacturing apparatus according to the other embodiment described above, and Film T represents the thickness of the free-standing film after passing through the fourth main roller and the third shear roller.

[0105] 6, the experimental results of Experimental Examples 5EX5, 6EX6, and 7EX7 confirmed that the thickness of the free-standing film was reduced as the gap between each of the main rollers and each of the shear rollers was gradually reduced in the first direction.

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

[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, calendering the fine powder supplied from the feeder as 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; Including, a diameter of each of the plurality of shear rollers is smaller than a diameter of each of the plurality of main rollers; The diameters of the plurality of shear rollers sequentially increase in the first direction.

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 apparatus of claim 1 , wherein the diameters of the plurality of shear rollers gradually decrease in the first direction.

4. 2. The dry electrode manufacturing apparatus according to claim 1, 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.

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

6. The dry electrode manufacturing apparatus of claim 5 , wherein the linear speeds of the shear rollers increase in the first direction.

7. The dry electrode manufacturing apparatus of claim 1 , wherein the intervals between the main rollers and the shear rollers become gradually smaller in the first direction.

8. 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 as the freestanding film together with the first main roller; The dry electrode manufacturing apparatus according to claim 1 , comprising:

9. 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 8 , comprising:

10. 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 of the freestanding film together with the second main roller; The dry electrode manufacturing apparatus according to claim 9 , further comprising:

11. 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 according to claim 10, further comprising:

12. The dry electrode manufacturing apparatus according to claim 11 , wherein the second shear roller is located on an opposite side of the first shear roller in the second direction.

13. The dry electrode manufacturing apparatus according to claim 11 , wherein the diameter of the second shear roller is larger than the diameter of the first shear roller.

14. The dry electrode manufacturing apparatus according to claim 11, wherein the linear velocity of the second shear roller is greater than the linear velocity of the first shear roller.

15. 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 according to claim 11 , further comprising:

16. The plurality of shear rollers include: a third shear roller adjacent to the fourth main roller in the second direction and stretching the freestanding film in a fifth direction together with the third main roller; The dry electrode manufacturing apparatus according to claim 15, further comprising:

17. The dry electrode manufacturing apparatus according to claim 16, wherein the diameter of the third shear roller is larger than the diameter of the second shear roller.

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

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