Secondary battery degassing device

Abstract

The present invention relates to a secondary battery degassing device, and more specifically, provides a secondary battery degassing device including a first rolling press having a plurality of first pressure rollers attached at predetermined intervals, a second rolling press arranged opposite the first rolling press and having a plurality of second pressure rollers attached at predetermined intervals, a first drive device that varies the distance between the first rolling press and the second rolling press, and a second drive device that drives the first pressure roller and the second pressure roller to rotate, wherein the first pressure roller and the second pressure roller come into rolling contact with and pressurize a secondary battery placed between the first rolling press and the second rolling press.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0133604, filed on October 17, 2022, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The present invention relates to a secondary battery degassing device, and more particularly to an arch-type battery degassing device for pressurizing a secondary battery and forcing out gas trapped in an electrode assembly. [Background technology]

[0003] A conventional method for manufacturing a battery cell as a pouch-type secondary battery is as follows. First, positive and negative electrode plates are manufactured, a separator is interposed between them, and the plates are stacked to form an electrode assembly. The plasticizer (DBP) is then extracted from the electrode assembly, and electrode tabs are welded to the electrode leads of the electrode assembly, which is then placed inside a pouch case. After the electrode assembly is placed inside the pouch case, an electrolyte is injected into the pouch case, so that the electrode assembly is impregnated with the electrolyte. Once the electrolyte is injected, the edges of the pouch case are heat-sealed to seal the pouch case.

[0004] After that, the assembled battery cell undergoes an aging process to stabilize it, followed by an activation process in which the battery cell is repeatedly charged and discharged. However, during the activation process, an irreversible reaction between the electrolyte and additives occurs due to the formation of an SEI layer, generating gas. The gas present inside the pouch case must be removed; failure to do so can cause battery cell defects. Therefore, a degassing process is performed using a battery cell degassing device to remove the gas from inside the pouch case. In the degassing process, a degassing hole is formed in the pouch, and the generated gas can be removed by, for example, placing the battery cell in a vacuum chamber and sucking out the gas. The formed degassing hole can be closed using a tape or other method.

[0005] However, while the degassing process can remove gas generated around the electrode assembly inside the battery cell, it is difficult to completely remove fine gases generated and trapped between the negative electrode, positive electrode, and separator of the electrode assembly. The fine gases trapped between the negative electrode, positive electrode, and separator can cause lithium deposition in the subsequent secondary activation process, adversely affecting the performance and lifespan of the secondary battery.

[0006] Therefore, there is a need to develop technology to solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made to solve the above-mentioned problems, and provides a degassing device for a secondary battery that can pressurize the secondary battery to push out fine gas trapped between the negative electrode, positive electrode, and separator of an electrode assembly housed inside the secondary battery to the outside of the electrode structure, thereby reducing lithium deposition due to gas trapped in the electrode assembly inside the secondary battery. [Means for solving the problem]

[0008] As one embodiment of the present invention, the present invention provides a secondary battery degassing device including a first rolling press having a plurality of first pressure rollers attached at predetermined intervals, a second rolling press arranged opposite the first rolling press and having a plurality of second pressure rollers attached at predetermined intervals, a first drive device that varies the distance between the first rolling press and the second rolling press, and a second drive device that drives the first pressure roller and the second pressure roller to rotate, wherein the first pressure roller and the second pressure roller come into rolling contact with and pressurize a secondary battery placed between the first rolling press and the second rolling press.

[0009] The first pressure roller and the second pressure roller may be disposed at positions corresponding to each other.

[0010] Also, the shortest distance between the first pressure roller and the second pressure roller may be equal to or greater than the thickness of an electrode assembly included in the secondary battery.

[0011] In addition, a plurality of first protective plates with flat lower surfaces are arranged at the lower end of the first rolling press, and the first protective plates are arranged between the plurality of first pressure rollers, and the first pressure rollers can protrude downward beyond the first protective plates.

[0012] The second rolling press may further include a drive gear coupled to the second drive device and rotated, and a first transmission gear between the drive gear and the second pressure roller, transmitting the rotational drive of the drive gear to the second pressure roller.

[0013] In addition, the second pressure roller and the first transmission gear may have sawtooth meshing therewith.

[0014] The first transmission gear may be disposed between a pair of adjacent second pressure rollers.

[0015] The second rolling press may further include a plurality of second transmission gears that are sequentially arranged at predetermined intervals with respect to the first transmission gear and are respectively arranged between pairs of the second pressure rollers adjacent to each other.

[0016] The pressurizing device may further include a transmission line for transmitting the rotational power of the first transmission gear to the first pressure roller.

[0017] The first transmission gear may include a first gear portion that is gear-coupled with the drive gear, and a first pulley portion that protrudes from the gear portion in the axial direction and contacts the transmission line.

[0018] In addition, the first pulley portion may have a first guide groove formed along its periphery to guide the transmission line.

[0019] The rolling press may further include a tensioner that increases tension in the transmission line when the first driving device drives the first rolling press and the second rolling press to approach each other.

[0020] In addition, one end of the tensioner is hingedly connected to the first rolling press, and the other end is in contact with the transmission line. When the first driving device is driven so that the first rolling press and the second rolling press approach each other, the other end of the tensioner can press the transmission line outward.

[0021] In addition, the first rolling press includes a plurality of intermediate rollers respectively arranged between the plurality of first pressure rollers, and the transmission line repeatedly contacts the upper surfaces of the plurality of first pressure rollers and the lower surfaces of the plurality of intermediate rollers, thereby rotating the first pressure rollers and the intermediate rollers.

[0022] The second rolling press may include a third transmission gear disposed adjacent to the second transmission gear farthest from the first transmission gear and in contact with the second pressure roller.

[0023] In addition, the transmission line may connect the third transmission gear and the first pressure roller.

[0024] The third transmission gear may include a second gear portion that is gear-coupled with the second transmission gear, and a second pulley portion that protrudes from the second gear portion in the axial direction and contacts the transmission line.

[0025] In addition, the second pulley portion may have a second guide groove formed along its periphery to guide the transmission line.

[0026] Also, at least one of the first rolling press and the second rolling press may further include guide rails on both sides thereof for guiding the vertical movement.

[0027] In addition, a plurality of second protective plates with flat lower surfaces are arranged on the upper surface of the second rolling press, the second protective plates are arranged between the plurality of second pressure rollers, and the second pressure rollers support secondary batteries that protrude above the second protective plates. [Effects of the Invention]

[0028] The present invention provides a secondary battery that exhibits stable performance and has an improved lifespan by removing gas generated and trapped between the negative electrode, positive electrode, and separator of an electrode assembly housed inside the secondary battery during an activation process by pushing it outward from the electrode assembly, thereby reducing the amount of lithium deposited inside the secondary battery. [Brief explanation of the drawings]

[0029] [Figure 1] 1 is a perspective view schematically illustrating a secondary battery degassing device according to an embodiment of the present invention. [Figure 2]As one embodiment of the present invention, (a) is a front view showing a case where a first rolling press and a second rolling press are driven to move closer together by a first driving device in a secondary battery degassing device, and (b) is a front view showing a case where the first rolling press and the second rolling press are driven to move away from each other. [Figure 3] (a) is an oblique view showing the driving force transmission section of the first pressure roller as one embodiment of the present invention, and (b) is an oblique view showing the driving force transmission section of the first pressure roller as another embodiment of the present invention. [Figure 4] As one embodiment of the present invention, (a) is a perspective view showing a first rolling press as viewed from below, and (b) is a perspective view showing a second rolling press as viewed from above. [Figure 5] FIG. 2 is a perspective view showing an embodiment of a second pressure roller according to the present invention. [Figure 6] FIG. 1 is a perspective view showing an embodiment of a first transmission gear and a third transmission gear according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily understand and practice the preferred embodiments of the present invention. However, the present invention may be embodied in various different forms and is not limited to the following embodiments.

[0031] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the explanation or related known technologies that may unnecessarily obscure the gist of the present invention will be omitted, and in this specification, when assigning reference symbols to components in each drawing, the same or similar reference symbols will be assigned to the same or similar components throughout the specification.

[0032] Furthermore, the terms and words used in this specification and claims should not be interpreted in a limited way to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical idea of ​​the present invention, based on the principle that inventors can appropriately define the concepts of terms in order to best explain their inventions.

[0033] [Secondary battery degassing device 10] Referring to Figures 1 to 4, as one embodiment of the present invention, the present invention relates to a secondary battery degassing device 10, which can include a first rolling press 100, a first driving device 200, a second rolling press 300, and a second driving device 400.

[0034] The secondary battery degassing device 10 may be a device for pushing out gas trapped between the positive electrode, negative electrode, and separator of an electrode assembly housed in a pouch-type secondary battery after a primary activation process and a sealing process of the secondary battery to the outside of the electrode assembly, thereby minimizing lithium deposition caused by the trapped gas.

[0035] The first rolling press 100 may be configured to pressurize the upper surface of the secondary battery from above the secondary battery.

[0036] The first rolling press 100 can include a first pressure roller 110 , a first guard plate 120 , an intermediate roller 130 , and a tensioner 140 .

[0037] Referring to FIG. 2, at least one of the first rolling press 100 and the second rolling press 300 is driven by a first driving device 200 to linearly reciprocate vertically, and the distance can be adjusted according to the type and thickness of the secondary battery.

[0038] A plurality of first pressure rollers 110 may be provided. The plurality of first pressure rollers 110 may be attached at predetermined intervals to one end of the first rolling press 100. More specifically, the first pressure rollers 110 may be attached at a lower end of the first rolling press 100 at predetermined intervals.

[0039] The first pressure roller 110 rotates by receiving a driving force transmitted by the rotation drive of the second driving device 400, and is in direct contact with the upper surface of the secondary battery to pressurize the secondary battery together with the second pressure roller 310. The first pressure roller 110 can also move the pressed secondary battery horizontally along the rotation direction. That is, the first pressure roller 110 comes into rolling contact with the upper surface of the secondary battery, moves the secondary battery in one direction, and sequentially pressurizes the upper surface of the secondary battery from one side to the other.

[0040] The first pressure roller 110 may include a first pressure unit 111 and a driving force transmission unit 112 .

[0041] The first pressure member 111 is formed in a cylindrical shape and contacts the upper surface of the secondary battery to directly apply pressure together with the second pressure member 311 described later, and the outer surface may be formed smoothly so as to efficiently transmit pressure to the secondary battery.

[0042] The driving force transmission part 112 is coupled to the end of the first pressure part 111, and the rotational driving force of the second driving device 400 is transmitted by the elastic force and frictional force of the transmission line 500, thereby rotating the first pressure part 111.

[0043] Referring to FIG. 3, the driving force transmission part 112 may include a cylindrical shape that can rotate around a rotation axis that coincides with the rotation axis of the first pressure part 111, and may have mounting grooves 112a and 112b formed along the outer circumferential surface to which the transmission line 500 is attached.

[0044] 3(a), in one embodiment, the mounting groove 112a may be formed in a smooth shape along the outer circumferential surface of the driving force transmission part 112. The transmission line 500 can rotate the driving force transmission part 112 by the frictional force between the transmission line 500 and the mounting groove 112a.

[0045] 3(b), in another embodiment, the mounting groove 112b may include a continuous sawtooth shape along the outer circumferential surface of the driving force transmission part 112. The sawtooth shape formed on the mounting groove 112b may come into contact with the transmission line 500 due to tension from the tensioner 140 and may be coupled to the inner surface of the transmission line 500 by friction. Furthermore, even when the transmission line 500 moves in a circular motion due to the rotational driving of the second driving device 400, the frictional force prevents the transmission line 500 from shifting from the mounting groove 112b, thereby allowing the transmission force of the transmission line 500 to be completely transmitted to the driving force transmission part 112.

[0046] The first protective plate 120 is disposed at the lower end of the first rolling press 100 and may be disposed between each of the first pressure rollers 110 .

[0047] Referring to FIG. 4(a), a plurality of first protective plates 120 having flat surfaces may be disposed at one end of the first rolling press 100, and the first pressure roller 110 may protrude to one side from the first protective plates 120. More specifically, the first protective plates 120 have flat bottom surfaces, and the first pressure roller 110 may protrude downward from the first protective plates 120. The first pressure roller 110 may be exposed and protrude through a space between the first protective plates 120 and an adjacent first protective plate 120. Because the first pressure roller 110 protrudes downward from the first protective plates 120, the secondary batteries may be pressed by the first pressure roller 110. The first protective plates 120 may prevent secondary batteries from entering the space between the first pressure roller 110 and an adjacent first pressure roller 110. The first protective plate 120 can guide the secondary battery, which is moved in one direction by the first pressure roller 110 and the second pressure roller 310, so that it can move to the adjacent first pressure roller 110 and second pressure roller 310.

[0048] The intermediary roller 130 may be a roller for increasing the contact area between the transmission line 500 and the first pressure rollers 110 so that the plurality of first pressure rollers 110 can be driven to rotate simultaneously. A plurality of intermediary rollers 130 may be provided, and each intermediary roller 130 may be disposed between the plurality of first pressure rollers 110 so that the plurality of first pressure rollers 110 can be driven to rotate via the transmission line 500. The transmission line 500 repeatedly contacts either one of the upper and lower surfaces of the plurality of first pressure rollers 110 with either the other of the upper and lower surfaces of the plurality of intermediary rollers 130, thereby increasing the contact area with the first pressure rollers 110. This allows the plurality of first pressure rollers 110 to rotate together via the single transmission line 500.

[0049] The diameter of the intermediate roller 130 may be smaller than the diameter of the first pressure roller 110, and the center line of the array of multiple intermediate rollers 130 may be formed at a position that coincides with or approximately coincides with the center line of the array of multiple first pressure rollers 110.

[0050] The intermediate roller 130 may be connected to the driving force transmission unit 112 of the first pressure roller 110 via a transmission line 500. The driving force transmission unit 112 is rotated by the rotational driving force transmitted from the transmission line 500 via the intermediate roller 130, thereby allowing the first pressure roller 111 to rotate in one direction.

[0051] The intermediate roller 130 may have a transmission groove (not shown) formed on the cylindrical outer surface along the periphery of the cylinder, to which the transmission line 500 is attached.

[0052] In one embodiment, the transmission groove (not shown) may be formed in a smooth shape along the outer circumferential surface of the intermediate roller 130. The transmission line 500 can rotate the intermediate roller 130 due to the frictional force between the transmission line 500 and the transmission groove.

[0053] In another embodiment, the transmission groove may include a continuous sawtooth shape along the outer circumferential surface of the intermediary roller 130. The sawtooth shape formed in the transmission groove may increase the contact area with the transmission line 500 to apply pressure to the transmission line 500. Even when the transmission line 500 moves in a circular motion due to the rotational driving of the second driving device 400, the transmission line 500 may not be misaligned with the transmission groove, and the transmission force of the transmission line 500 may be completely transmitted to the intermediary roller 130.

[0054] Referring to FIG. 2, the tensioner 140 is coupled to the first rolling press 100 and can increase the tension of the transmission line 500 when the first rolling press 100 and the second rolling press 300 are driven to approach each other.

[0055] One end of the tensioner 140 is hinged to the first rolling press 100, and the other end can contact the transmission line 500. Therefore, when the first rolling press 100 and the second rolling press 300 are driven to approach each other, the other end of the tensioner 140 moves to one side and presses the transmission line 500 outward, thereby increasing the tension.

[0056] A roller is coupled to the other end of the tensioner 140, and the transmission line 500 can contact the roller. The roller coupled to the other end of the tensioner 140 can allow the tensioner 140 to make rolling contact with the transmission line 500 and move along the inner surface of the transmission line 500.

[0057] A plurality of tensioners 140 may be provided and coupled to one side and the other side of the first rolling press 100. The plurality of tensioners 140 may widen the transmission line 500 to both sides to increase tension.

[0058] At least one of the first rolling press 100 and the second rolling press 300 may further include guide rails 150 on both sides thereof.

[0059] The guide rails 150 are arranged on both sides of at least one of the first rolling press 100 and the second rolling press 300, and can guide the vertical movement of the first rolling press 100 or the second rolling press 300 when the first rolling press 100 or the second rolling press 300 is driven up and down by the first driving device 200.

[0060] The first driving device 200 can linearly drive at least one of the first rolling press 100 and the second rolling press 300 in the vertical direction. Preferably, the first driving device 200 can linearly drive the first rolling press 100 in the vertical direction and adjust the distance between the first rolling press 100 and the second rolling press 300. In other words, the first driving device 200 can vary the distance between the first rolling press 100 and the second rolling press 300.

[0061] The first drive unit 200 may be, for example, but not limited to, an actuator, a pneumatic, or a hydraulic piston-cylinder unit.

[0062] The first driving device 200 is disposed above the first rolling press 100, and a plurality of support units 160 may be disposed between the first driving device 200 and the first rolling press 100. The plurality of support units 160 may distribute the pressure of the first driving device 200, allowing the first rolling press 100 to apply uniform pressure to the secondary battery.

[0063] The second rolling press 300 may be disposed to face the first rolling press 100. The second rolling press 300 is located below the first rolling press 100 and can pressurize and move the secondary battery in one direction together with the first rolling press 100.

[0064] The second rolling press 300 may include a second pressure roller 310 , a drive gear 410 , a first transmission gear 320 , a second transmission gear 330 , and a third transmission gear 340 .

[0065] A plurality of second pressure rollers 310 may be provided and may be attached at predetermined intervals to one end of the second rolling press 300. More specifically, the second pressure rollers 310 may be attached at a predetermined interval to the upper end of the second rolling press 300.

[0066] The plurality of first pressure rollers 110 and the plurality of second pressure rollers 310 may be arranged at corresponding positions such that the first pressure rollers 110 and the second pressure rollers 310 face each other when the first rolling press 100 and the second rolling press 300 are driven to approach each other by the first driving device 200. That is, the arrangement of the plurality of first pressure rollers 110 and the arrangement of the plurality of second pressure rollers 310 may match each other.

[0067] The second pressure roller 310 can be rotated by the rotational drive of the second driving device 400. The second pressure roller 310 and the first pressure roller 110 rotate in opposite directions, allowing a secondary battery located between the first pressure roller 110 and the second pressure roller to move in one direction. The second pressure roller 310 can move a secondary battery pressed along its rotational direction toward the adjacent second pressure roller 310. The second pressure roller 310 makes rolling contact with the underside of the secondary battery, moving the secondary battery in one direction and sequentially pressing the underside of the secondary battery from one side to the other. That is, the first pressure roller 110 and the second pressure roller 310 press the secondary battery together and move the secondary battery in one direction.

[0068] Referring to FIG. 5, the second pressure roller 310 may include a second pressure portion 311 and an operating gear portion 312 .

[0069] The second pressure part 311 is formed in a cylindrical shape and can be in contact with the lower surface of the secondary battery at the bottom of the secondary battery to directly apply pressure together with the first pressure part 111, and the outer surface can be formed smoothly so as to efficiently transmit pressure to the secondary battery.

[0070] The shortest distance between the first pressure roller 110 and the second pressure roller 310, which is adjusted by the first driving device 200, may be equal to or greater than the thickness of an electrode assembly included in the secondary battery. More specifically, the distance between the upper end of the second pressure member 311 of the second pressure roller 310 and the lower end of the first pressure member 111 of the first pressure roller 110 may be equal to or greater than the thickness of an electrode assembly included in the secondary battery, and preferably may be equal to or approximately equal to the thickness of the electrode assembly. If the distance between the upper end of the second pressure member 311 and the lower end of the first pressure member 111 is smaller than the thickness of the electrode assembly, the electrode assembly may be damaged by the pressure applied to the electrode assembly, so the distance needs to be equal to or greater than the thickness.

[0071] The secondary battery degassing device 10 of the present invention may be configured to remove fine gases generated between or trapped between the positive electrode, negative electrode, and separator of the electrode assembly by pushing them outward from the electrode assembly. Therefore, the distance between the upper end of the second pressurizing member 311 and the lower end of the first pressurizing member 111 may be the same as or approximately the same as the thickness of the electrode assembly, since the first pressurizing member 111 and the second pressurizing member 311 need to be as closely attached to the electrode assembly as possible so as not to damage the electrode structure and to push the gases generated inside the electrode assembly outward from the electrode assembly.

[0072] The operating gear part 312 is coupled to one end of the second pressure part 311 and may include a cylindrical shape that is rotatable around a rotation axis that coincides with the rotation axis of the second pressure part 311, and may have a continuous sawtooth gear formed along its outer circumferential surface.

[0073] The operating gear unit 312 receives the rotational driving force of the second driving device 400 and can rotate the second pressure unit 311. The operating gear unit 312 and the second pressure unit 311 can rotate at the same angular velocity.

[0074] The first transmission gear 320 receives a rotational driving force from the drive gear 410 of the second drive device 400, and can drive the second pressure roller 310 to rotate.

[0075] 6, the outer circumferential surface of the first transmission gear 320 may have sawtooth teeth formed on the outer surface thereof to mesh with the operating gear portion 312 of the second pressure roller 310. The first transmission gear 320 may be disposed between a pair of adjacent second pressure rollers 310. The first transmission gear 320 meshes with the pair of adjacent second pressure rollers 310, so that when the first transmission gear 320 rotates in one direction, the pair of second pressure rollers 310 meshing with the first transmission gear 320 may rotate in the opposite direction. More specifically, the first transmission gear 320 may mesh with a pair of adjacent operating gear portions 312.

[0076] The first transmission gear 320 can be disposed below the second pressure roller 310.

[0077] The first transmission gear 320 may be rotated by being geared by meshing with the sawtooth formed on the driving gear 410. The first transmission gear 320 may be located above the driving gear 410 and between the driving gear 410 and the second pressure roller 310.

[0078] The first transmission gear 320 may include a first gear portion 321 and a first pulley portion 322 .

[0079] As described above, the first gear portion 321 has sawtooth formed on its outer surface, and can be rotated by meshing with the drive gear 410 and the pair of adjacent actuation gear portions 312 .

[0080] The first pulley portion 322 is formed to protrude cylindrically from one surface of the first gear portion 321 in the direction of the rotation axis of the first gear portion 321, and can contact the transmission line 500 (described later). The first pulley portion 322 may have a first guide groove 322a formed along the outer circumferential surface to guide the transmission line 500. As the first pulley portion 322 is rotated, the transmission line 500 can move in a circular motion due to frictional force with the first pulley portion 322.

[0081] The first pulley portion 322 is formed integrally with the first gear portion 321 and can rotate at the same angular velocity as the first gear portion 321.

[0082] The second transmission gear 330 may be formed in a gear shape and provided in plurality. The second transmission gears 330 may be sequentially arranged at predetermined intervals with respect to the first transmission gear 320 and may be respectively arranged between a pair of adjacent second pressure rollers 310.

[0083] The second transmission gear 330 may be disposed at the same height as the first transmission gear 320 in the second rolling press 300, and may be disposed below the position of the second pressure roller.

[0084] The sawtooth formed on the outer surface of the second transmission gear 330 is engaged with the sawtooth of the operating gear portion 312 of a pair of adjacent second pressure rollers 310 adjacent to the second transmission gear 330, and they can rotate together. The rotation direction of the second transmission gear 330 and the rotation direction of the second pressure roller 310 can be opposite to each other.

[0085] The third transmission gear 340 can be disposed at the same height as the first transmission gear 320 and the second transmission gear 330 in the second rolling press 300, and can be disposed below the position of the second pressure roller.

[0086] The third transmission gear 340 may be disposed adjacent to the second transmission gear 330 that is the furthest from the first transmission gear 320 , and may be in contact with the second pressure roller 310 .

[0087] Referring to FIG. 6, the third transmission gear 340 may include a second gear portion 341 and a second pulley portion 342 .

[0088] The second gear portion 341 may be gear-coupled with the second transmission gear 330. The second gear portion 341 may have a gear shape and may have sawtooth on its outer surface to mesh with sawtooth of the second transmission gear 330.

[0089] The second pulley part 342 may be formed to protrude in the rotation axis direction on one surface of the second gear part 341. The second pulley part 342 may be in contact with the transmission line 500.

[0090] The third transmission gear 340 may receive the rotational driving force of the second driving device 400 via the second pressure unit 311 and may be connected to the first pulley unit 322 and the operating gear unit 312 via a transmission line 500 .

[0091] The second pulley part 342 may have a second guide groove 342a formed along its periphery to guide the transmission line 500. The second guide groove 342a may have a continuous sawtooth shape to improve friction with the transmission line 500.

[0092] The second protection plate 350 is disposed at the upper end of the second rolling press 300 and may be disposed between each of the plurality of second pressure rollers 310 .

[0093] Referring to FIG. 4(b), a plurality of flat second protective plates 350 are disposed at one end of the second rolling press 300, and the second pressure rollers 310 may protrude upward from the second protective plates 350. More specifically, the second protective plates 350 have flat upper surfaces, and the second pressure rollers 310 may protrude upward from the second protective plates 350. The second pressure rollers 310 may be exposed and protrude through the spaces between the second protective plates 350 and adjacent second protective plates 350. Because the second pressure rollers 310 protrude upward from the second protective plates 350, the secondary batteries may be pressed by the second pressure rollers 310. The second protective plates 350 may prevent secondary batteries from entering the spaces between the second pressure rollers 310 and adjacent second pressure rollers 310. The second protective plate 350 can guide the secondary battery, which is moved in one direction by the first pressure roller 110 and the second pressure roller 310, so that it can move to the adjacent first pressure roller 110 and second pressure roller 310.

[0094] The second drive device 400 may be a rotary drive device, such as, but not limited to, a motor.

[0095] The second driving device 400 can rotate a driving gear 410 coupled to a rotation shaft of the second driving device 400. The rotational driving force of the second driving device 400 can be transmitted to a first transmission gear 320, a second pressure roller 310, a second transmission gear 330, and a third transmission gear 340, which are directly or indirectly connected to the driving gear 410.

[0096] The second drive unit 400 can maintain the angular velocity of the rotation drive constant, or decrease or increase the angular velocity according to the user's control.

[0097] The second driving device 400 is coupled to the second rolling press 300 and may be at least partially located inside the second rolling press 300 .

[0098] The driving gear 410 may be formed in a gear shape and coupled to a rotation shaft of the second driving device 400. The driving gear 410 is disposed on one surface of the second rolling press 300 and is gear-coupled to and directly meshes with the first gear portion 321 of the first transmission gear 320 to rotate, thereby transmitting the rotational driving force of the second driving device 400 to the first gear portion 321.

[0099] The diameter of the drive gear 410 may be larger than the diameter of the first transmission gear 320 .

[0100] The transmission line 500 transmits the rotational driving force of the second driving device 400 to the first pressure roller 110 and the intermediate roller 130, thereby rotating the first pressure roller 110 and the intermediate roller 130.

[0101] The transmission line 500 may be made of a material that can be flexibly deformed and elastically restored, such as, but not limited to, a rubber material.

[0102] The transmission line 500 is in contact with the first pulley unit 322, the driving force transmission unit 112, the intermediate roller 130, and the second pulley unit 342, and as the first pulley unit 322 is driven to rotate, the first pulley unit 322, the driving force transmission unit 112, the intermediate roller 130, and the second pulley unit 342 can be moved in a circular manner. The driving force transmission unit 112 and the intermediate roller 130 can receive the rotational driving force through the circular movement of the transmission line 500. That is, as the second driving device 400 is driven to rotate, not only the drive gear 410, the first transmission gear 320, the second transmission gear 330, the third transmission gear 340, and the second pressure roller 310 can be driven to rotate, but also the first pressure roller 110 and the intermediate roller 130, which are connected via the transmission line 500, can be driven to rotate.

[0103] When the first driving device 200 drives the first rolling press 100 and the second rolling press 300 to move away from each other, tension may be generated in the transmission line 500 by the force of the first rolling press 100 and the second rolling press pulling the transmission line 500. When the first rolling press 100 and the second rolling press 300 are driven to move toward each other, tension may be generated by the force of the tensioners 140 pushing the transmission line 500 in both directions.

[0104] The tension formed in the transmission line 500 causes the transmission line 500 to adhere tightly to the first pulley portion 322, the driving force transmission portion 112, the intermediate roller 130, and the second pulley portion 342, which are in contact with the transmission line 500, and increases the frictional force at the contact surfaces of the above configuration and the transmission line 500, thereby allowing the first pulley portion 322, the driving force transmission portion 112, the intermediate roller 130, and the second pulley portion 342 to rotate together.

[0105] The transmission line 500 is arranged in a zigzag pattern so as to repeatedly contact the upper surface of the driving force transmission part 112 of the first pressure roller 110 with the lower surface of the intermediate roller 130, thereby increasing the contact area between the driving force transmission part 112 and the transmission line 500 and increasing the frictional force between the transmission line 500 and the driving force transmission part 112, allowing the sequentially arranged multiple driving force transmission parts 112 to rotate together at the same angular velocity.

[0106] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the scope equivalent to the technical concept of the present invention and the claims that will be described later by a person having ordinary skill in the art to which the present invention pertains. [Explanation of symbols]

[0107] 10: Secondary battery degassing device 100: First rolling press 110: First pressure roller 111: First pressure section 112: Driving force transmission section 112a, 112b: Mounting groove 120: First protective plate 130: Media roller 140: Tensioner 150: Guide rail 160: Support unit 200: First drive unit 300: Second rolling press 310: Second pressure roller 311: Second pressure section 312: Operating gear part 320: 1st transmission gear 321: First Gear 322: First pulley section 322a: First guide groove 330: Second transmission gear 340: 3rd transmission gear 341: Second gear section 342: Second pulley section 342a: Second guide groove 350: Second protective plate 400: Second drive unit 410: Drive gear 500: Transmission line

Claims

1. a first rolling press having a plurality of first pressure rollers attached at predetermined intervals; a second rolling press disposed opposite the first rolling press and having a plurality of second pressure rollers attached at predetermined intervals; a first driving device that varies the distance between the first rolling press and the second rolling press; a second driving device that drives the first pressure roller and the second pressure roller to rotate; A secondary battery degassing device comprising: The first pressure roller and the second pressure roller roll and come into contact with and pressurize a secondary battery placed between the first rolling press and the second rolling press.

2. The secondary battery degassing device according to claim 1 , wherein the first pressure roller and the second pressure roller are disposed at positions corresponding to each other.

3. The degassing device for a secondary battery according to claim 2 , wherein the shortest distance between the first pressure roller and the second pressure roller is equal to or greater than the thickness of an electrode assembly included in the secondary battery.

4. a plurality of first protective plates each having a flat surface are disposed at one end of the first rolling press; the first protection plate is disposed between the first pressure rollers; 4. The secondary battery degassing device according to claim 1, wherein the first pressure roller protrudes to one side beyond the first protection plate.

5. The second rolling press comprises: a drive gear coupled to the second drive device and driven to rotate; The secondary battery degassing device according to claim 1 , further comprising: a first transmission gear that transmits the rotational drive of the drive gear to the second pressure roller between the drive gear and the second pressure roller.

6. The secondary battery degassing device according to claim 5 , wherein the second pressure roller and the first transmission gear are formed with sawtooth members that mesh with each other.

7. The secondary battery degassing device according to claim 5 , wherein the first transmission gear is disposed between a pair of the second pressure rollers adjacent to each other.

8. The second rolling press comprises:

6. The secondary battery degassing device according to claim 5, further comprising a plurality of second transmission gears arranged sequentially at predetermined intervals relative to the first transmission gear and respectively disposed between a pair of the second pressure rollers adjacent to each other.

9. The secondary battery degassing device according to claim 8 , further comprising a transmission line that transmits the rotational power of the first transmission gear to the first pressure roller.

10. The first transmission gear is a first gear portion that is gear-coupled with the drive gear; The secondary battery degassing device according to claim 9 , further comprising: a first pulley portion that protrudes axially from the first gear portion and that contacts the transmission line.

11. The secondary battery degassing device according to claim 10 , wherein the first pulley portion has a first guide groove formed along a periphery thereof to guide the transmission line.

12. The secondary battery degassing device according to claim 10 , further comprising a tensioner that increases tension of the transmission line when the first driving device drives the first rolling press and the second rolling press to approach each other.

13. One end of the tensioner is hingedly connected to the first rolling press, and the other end is in contact with the transmission line; The secondary battery degassing device according to claim 12 , wherein when the first driving device is driven so that the first rolling press and the second rolling press approach each other, the other end of the tensioner presses the transmission line outward.

14. the first rolling press includes a plurality of intermediate rollers respectively disposed between the plurality of first pressure rollers; The secondary battery degassing device according to claim 10 , wherein the transmission line repeatedly contacts upper surfaces of the first pressure rollers and lower surfaces of the intermediate rollers, thereby rotating the first pressure rollers and the intermediate rollers.

15. The second rolling press comprises: The secondary battery degassing device according to claim 10 , further comprising a third transmission gear disposed adjacent to the second transmission gear farthest from the first transmission gear and in contact with the second pressure roller.

16. The secondary battery degassing device according to claim 15, wherein the transmission line connects between a third transmission gear and the first pressure roller.

17. The third transmission gear is a second gear portion that is gear-coupled with the second transmission gear; The secondary battery degassing device according to claim 16 , further comprising: a second pulley portion that protrudes axially from the second gear portion and that contacts the transmission line.

18. The secondary battery degassing device according to claim 17, wherein the second pulley portion has a second guide groove formed along a periphery thereof to guide the transmission line.

19. The secondary battery degassing device according to claim 1 , wherein at least one of the first rolling press and the second rolling press further includes guide rails on both sides thereof for guiding vertical movement.

20. a plurality of second protective plates each having a flat surface are disposed at one end of the second rolling press; the second protection plate is disposed between the second pressure rollers; The secondary battery degassing device according to claim 1 , wherein the second pressure roller protrudes to one side beyond the second protection plate.

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