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 the contents disclosed in the document of the Korean Patent Application are incorporated herein by reference in their entirety.

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

Background Art

[0003] A conventional method for manufacturing a battery cell as such a pouch-type secondary battery is as follows. First, a positive electrode plate and a negative electrode plate are manufactured, and after a separator is interposed therebetween, they are laminated to produce an electrode assembly. Then, a plasticizer (DBP) is extracted from the electrode assembly manufactured as described above, and an electrode tab is welded to the electrode lead of the electrode assembly and built into the inside of a pouch case. After the electrode assembly is built into the pouch case in this way, an electrolytic solution is injected into the inside of the pouch case so that the electrode assembly is impregnated with the electrolytic solution. When the electrolytic solution is injected as described above, the edge of the pouch case is joined by heat fusion to seal the pouch case.

[0004] Afterward, the assembled battery cells undergo an aging process to stabilize them, followed by an activation process involving repeated charging and discharging. However, during the activation process, an irreversible reaction occurs between the electrolyte and additives due to the formation of the SEI layer, generating gas. This gas must be removed from inside the pouch case; failure to remove it will lead to battery cell failure. Therefore, a degassing process is performed using a battery cell degasser to remove the gas from inside the pouch case. In the degassing process, the generated gas can be removed by creating degassing holes in the pouch and sucking the gas out of the battery cells in a vacuum chamber. The created degassing holes can be closed by taping or other methods.

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

[0006] Therefore, there is a need to develop technologies to solve the problems mentioned above. [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention aims to solve the above-mentioned problems and provides a secondary battery degassing device that can reduce lithium deposition due to gas trapped in the electrode assembly within a secondary battery by pressurizing the secondary battery, thereby pushing out fine gas trapped between the negative electrode, positive electrode, and separator of the electrode assembly housed inside the secondary battery to the outside of the electrode structure. [Means for solving the problem]

[0008] As one embodiment of the present invention, the present invention provides a secondary battery degassing device comprising: a first rolling press having a plurality of first pressure rollers mounted at predetermined intervals; a second rolling press positioned opposite the first rolling press and having a plurality of second pressure rollers mounted at predetermined intervals; a first drive device for varying the distance between the first rolling press and the second rolling press; and a second drive device for rotationally driving the first pressure rollers and the second pressure rollers, wherein the first pressure rollers and the second pressure rollers roll into contact with and pressurize a secondary battery positioned between the first rolling press and the second rolling press.

[0009] Furthermore, the first pressure roller and the second pressure roller can be positioned in corresponding locations to each other.

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

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

[0012] Furthermore, the second rolling press may further include a drive gear coupled to the second drive device and rotationally driven, and 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.

[0013] Furthermore, the second pressure roller and the first transmission gear can have interlocking serrations formed on them.

[0014] Furthermore, the first transmission gear can be positioned between a pair of adjacent second pressure rollers.

[0015] Furthermore, the second rolling press may further include a plurality of second transmission gears arranged sequentially at predetermined intervals with respect to the first transmission gear, and each of these gears positioned between a pair of adjacent second pressure rollers.

[0016] Furthermore, the system may further include a transmission line that transmits the rotational power of the first transmission gear to the first pressure roller.

[0017] Furthermore, 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 axially from the gear portion and contacts the transmission line.

[0018] Furthermore, a first guide groove can be formed along the periphery of the first pulley portion so as to guide the transmission line.

[0019] Furthermore, the system may further include a tensioner that increases the tension of the transmission line when the first drive unit is driven to bring the first rolling press and the second rolling press closer together.

[0020] Furthermore, if one end of the tensioner is hinged to the first rolling press and the other end is in contact with the transmission line, and the first drive unit is driven so that the first rolling press and the second rolling press move closer together, the other end of the tensioner can pressurize the transmission line outward.

[0021] Furthermore, the first rolling press includes a plurality of intermediate rollers, each positioned between a 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 causing the first pressure rollers and the intermediate rollers to rotate.

[0022] Furthermore, the second rolling press may include a third transmission gear positioned adjacent to the second transmission gear furthest from the first transmission gear and in contact with the second pressure roller.

[0023] In addition, the transmission line can connect between the third transmission gear and the first pressing roller.

[0024] In addition, the third transmission gear can include a second gear portion that is gear-coupled to the second transmission gear, and a second pulley portion that axially protrudes from the second gear portion and contacts the transmission line.

[0025] In addition, a second guide groove can be formed along the periphery of the second pulley portion so that the transmission line is guided.

[0026] In addition, guide rails for guiding up-and-down driving can be further included on both side surfaces of at least one of the first rolling press and the second rolling press.

[0027] In addition, a plurality of second protection plates with flat lower surfaces are arranged on the upper surface of the second rolling press. The second protection plates are arranged between the plurality of second pressing rollers, and the second pressing rollers protrude above the second protection plates for a secondary battery.

Advantages of the Invention

[0028] According to the present invention, by extruding and removing the gas generated and trapped between the negative electrode, the positive electrode, and the separator of the electrode assembly housed inside the secondary battery during the activation process in the outward direction of the electrode assembly, the amount of lithium deposited inside the secondary battery can be reduced. Therefore, the secondary battery can exhibit stable performance and the life of the secondary battery can be improved, and a secondary battery can be provided.

Brief Description of the Drawings

[0029] [Figure 1] As one embodiment of the present invention, it is a perspective view schematically showing the state of a secondary battery degassing device. [Figure 2]As one embodiment of the present invention, (a) is a front view showing the case in which the first rolling press and the second rolling press are driven to move closer together by the first drive device in the secondary battery degassing device, and (b) is a front view showing the case in which the first rolling press and the second rolling press are driven to move further apart. [Figure 3] (a) is a perspective view showing the drive force transmission section of the first pressure roller as one embodiment of the present invention, and (b) is a perspective view showing the drive 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 the first rolling press viewed from below, and (b) is a perspective view showing the second rolling press viewed from above. [Figure 5] This is a perspective view showing one embodiment of a second pressure roller as one embodiment of the present invention. [Figure 6] This is a perspective view showing one embodiment of the first transmission gear and the third transmission gear as one embodiment of the present invention. [Modes for carrying out the invention]

[0030] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that they can be easily implemented by a person with ordinary skill in the art to which the present invention pertains. However, the present invention may be realized in various different forms and is not limited or restricted by the following embodiments.

[0031] To clearly explain the present invention, detailed descriptions of relevant prior art that are irrelevant to the description or that may unnecessarily obscure the essence of the invention have been omitted. In this specification, when assigning reference numerals to components in each drawing, the same or similar reference numerals are assigned to components that are the same or similar throughout the specification.

[0032] Furthermore, the terms and words used in this specification and in the claims should not be interpreted in a manner limited to their ordinary or dictionary meanings, but rather should be interpreted in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors may appropriately define the concepts of terms in order to best describe their invention.

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

[0034] The secondary battery degassing device 10 may be a device that, after the primary activation process and sealing process of a pouch-type secondary battery, pushes out the gas trapped between the positive electrode, negative electrode, and separator of the electrode assembly housed inside 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 apply pressure to the upper surface of the secondary battery at the top of the secondary battery.

[0036] The first rolling press 100 may include a first pressure roller 110, a first protective plate 120, a mediating roller 130, and a tensioner 140.

[0037] Referring to Figure 2, at least one of the first rolling press 100 and the second rolling press 300 is linearly reciprocated vertically by the first drive unit 200, and the distance can be adjusted according to the type and thickness of the secondary battery.

[0038] Multiple first pressure rollers 110 can be provided. Multiple first pressure rollers 110 can be attached to one end of the first rolling press 100 at predetermined intervals. More specifically, the first pressure rollers 110 can be attached to the lower end of the first rolling press 100 at predetermined intervals.

[0039] The first pressure roller 110 rotates when the driving force is transmitted by the rotational drive of the second drive unit 400, and can pressurize the secondary battery together with the second pressure roller 310 by directly contacting the upper surface of the secondary battery. In addition, the first pressure roller 110 can move the pressurized secondary battery horizontally along the direction of rotation. That is, the first pressure roller 110 rolls and makes contact with the upper surface of the secondary battery, moves the secondary battery in one direction, and can sequentially pressurize the upper surface of the secondary battery from one side to the other.

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

[0041] The first pressurizing section 111 is formed in a cylindrical shape and directly pressurizes the upper surface of the secondary battery together with the second pressurizing section 311, which will be described later. The outer surface can be smoothly formed to ensure that the pressurizing force is effectively transmitted to the secondary battery.

[0042] The drive force transmission unit 112 is connected to the end of the first pressurizing unit 111, and the rotational drive force of the second drive device 400 is transmitted by the elastic force and frictional force of the transmission line 500, thereby rotating the first pressurizing unit 111.

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

[0044] Referring to Figure 3(a), in one embodiment, the mounting groove 112a can be formed in a smooth shape along the outer circumferential surface of the drive force transmission unit 112. The transmission line 500 can rotate the drive force transmission unit 112 due to the frictional force between the transmission line 500 and the mounting groove 112a.

[0045] Referring to Figure 3(b), in another embodiment, the mounting groove 112b may include a continuous sawtooth pattern along the outer circumferential surface of the drive force transmission unit 112. The sawtooth pattern formed in the mounting groove 112b can come into contact with the transmission line 500 due to the tension from the tensioner 140 and be coupled to the inner surface of the transmission line 500 by frictional force. Furthermore, even if the transmission line 500 moves in a circular motion due to the rotational drive of the second drive unit 400, the transmission force of the transmission line 500 can be fully transmitted to the drive force transmission unit 112 without shifting from the mounting groove 112b due to frictional force.

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

[0047] Referring to Figure 4(a), a plurality of first protective plates 120, each having a flat surface, can be arranged at one end of the first rolling press 100, and the first pressure roller 110 can protrude to one side beyond the first protective plates 120. More specifically, the first protective plates 120 are formed with a flat lower surface, and the first pressure roller 110 can protrude below the first protective plates. The first pressure roller 110 can be exposed and protrude through the space between the first protective plate 120 and an adjacent first protective plate 120. Because the first pressure roller 110 protrudes below the first protective plates 120, the secondary battery can be pressurized by the first pressure roller 110. The first protective plates 120 can prevent the secondary battery from flowing into 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 moving 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 mediating roller 130 may be a roller that increases the contact area between the transmission line 500 and the first pressure rollers 110 so that multiple first pressure rollers 110 can be rotated simultaneously. Multiple mediating rollers 130 may be provided and can be positioned between multiple first pressure rollers 110 so that multiple first pressure rollers 110 can be rotated via the transmission line 500. The transmission line 500 repeatedly contacts either the upper or lower surface of one of the multiple first pressure rollers 110 and either the upper or lower surface of one of the multiple mediating rollers 130, thereby increasing the contact area with the first pressure rollers 110. This allows multiple first pressure rollers 110 to rotate together via a single transmission line 500.

[0049] The diameter of the mediating roller 130 may be smaller than the diameter of the first pressure roller 110, and the centerlines of the array of mediating rollers 130 can be formed at positions that coincide with or substantially coincide with the centerlines of the array of first pressure rollers 110.

[0050] The mediating roller 130 can be connected to the drive force transmission section 112 of the first pressure roller 110 via a transmission line 500. The drive force transmission section 112 rotates when the rotational drive force from the transmission line 500 is transmitted to it via the mediating roller 130, thereby allowing the first pressure section 111 to rotate in one direction.

[0051] The mediating roller 130 can have a transmission groove (not shown) formed on its 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) can be formed in a smooth shape along the outer circumferential surface of the mediating roller 130. The transmission line 500 can rotate the mediating roller 130 by the frictional force between the transmission line 500 and the transmission groove.

[0053] In another embodiment, the transmission groove may include a continuous sawtooth pattern along the outer circumferential surface of the mediating roller 130. The sawtooth pattern formed in the transmission groove can increase the contact area with the transmission line 500 in order to pressurize the transmission line 500, and even if the transmission line 500 moves in a circulating manner due to the rotational drive of the second drive unit 400, the transmission force of the transmission line 500 can be fully transmitted to the mediating roller 130 without shifting from the transmission groove.

[0054] Referring to Figure 2, the tensioner 140 is coupled to the first rolling press 100, and when the first rolling press 100 and the second rolling press 300 are driven to move closer together, the tension in the transmission line 500 can be increased.

[0055] The tensioner 140 has one end 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 move closer together, the other end of the tensioner 140 moves to one side, pressurizing the transmission line 500 outward and increasing the tension.

[0056] A roller is coupled to the other end of the tensioner 140, allowing the transmission line 500 to contact the roller. The roller coupled to the other end of the tensioner 140 allows the tensioner 140 to roll in contact with the transmission line 500 and move along the inner surface of the transmission line 500.

[0057] Multiple tensioners 140 are provided and can be coupled to one side and the other side of the first rolling press 100. Multiple tensioners 140 can spread the transmission line 500 to both sides and increase the 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.

[0059] The guide rail 150 is positioned on both sides of at least one of the first rolling press 100 and the second rolling press 300, and can guide the first rolling press 100 or the second rolling press 300 to move vertically when the first rolling press 100 or the second rolling press 300 is driven vertically by the first drive unit 200.

[0060] The first drive unit 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 drive unit 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. That is, the first drive unit 200 can vary the distance between the first rolling press 100 and the second rolling press 300.

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

[0062] The first drive unit 200 is positioned on top of the first rolling press 100, and a plurality of support units 160 can be positioned between the first drive unit 200 and the first rolling press 100. The plurality of support units 160 distribute the pressurizing force of the first drive unit 200, enabling the first rolling press 100 to pressurize the secondary battery with uniform pressure.

[0063] The second rolling press 300 can be positioned opposite the first rolling press 100. The second rolling press 300 is located below the first rolling press 100 and, together with the first rolling press 100, can pressurize the secondary battery and move it in one direction.

[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] Multiple second pressure rollers 310 can be provided and attached to one end of the second rolling press 300 at predetermined intervals. More specifically, the second pressure rollers 310 can be attached to the upper end of the second rolling press 300 at predetermined intervals.

[0066] The multiple first pressure rollers 110 and the multiple second pressure rollers 310 can be arranged in corresponding positions such that when the first rolling press 100 and the second rolling press 300 are driven by the first drive unit 200 to move closer to each other, each first pressure roller 110 and each second pressure roller 310 face each other. In other words, the arrangement of the multiple first pressure rollers 110 and the arrangement of the multiple second pressure rollers 310 can coincide with each other.

[0067] The second pressure roller 310 can be rotated by the rotational drive of the second drive unit 400, and the second pressure roller 310 and the first pressure roller 110 rotate in opposite directions, allowing the secondary battery located between the first pressure roller 110 and the second pressure roller to move in one direction. Furthermore, the second pressure roller 310 can move the pressurized secondary battery in the direction of the adjacent second pressure roller 310. The second pressure roller 310 rolls into contact with the lower surface of the secondary battery, moving the secondary battery in one direction and sequentially pressurizing the lower surface of the secondary battery from one side to the other. In other words, the first pressure roller 110 and the second pressure roller 310 can pressurize the secondary battery together and move the secondary battery in one direction.

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

[0069] The second pressurizing section 311 is formed in a cylindrical shape and can directly pressurize the secondary battery together with the first pressurizing section 111 by contacting the lower surface of the secondary battery at its lower part. Its outer surface can be smoothly formed to ensure that the pressurizing force is effectively transmitted 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 drive unit 200, may be greater than or equal to the thickness of the electrode assembly contained in the secondary battery. More specifically, the separation distance between the upper end of the second pressure portion 311 of the second pressure roller 310 and the lower end of the first pressure portion 111 of the first pressure roller 110 may be greater than or equal to the thickness of the electrode assembly contained inside the secondary battery, and preferably, it may be the same as or approximately the same as the thickness of the electrode assembly. The separation distance between the upper end of the second pressure portion 311 and the lower end of the first pressure portion 111 must be greater than or equal to the thickness of the electrode assembly, because if it is smaller than the thickness of the electrode assembly, the electrode assembly will be damaged by the pressure applied to it.

[0071] The secondary battery degassing device 10 of the present invention may be for pushing out and removing fine gas generated between or trapped between the positive electrode, negative electrode, and separator of an electrode assembly. Therefore, the separation distance between the upper end of the second pressurizing section 311 and the lower end of the first pressurizing section 111 may be the same as or approximately the same as the thickness of the electrode assembly, as it is necessary to bring the first pressurizing section 111 and the second pressurizing section 311 into maximum contact with the electrode assembly in order to avoid damaging the electrode structure and to push out the gas formed inside the electrode assembly.

[0072] The operating gear section 312 is coupled to one end of the second pressurizing section 311 and may include a cylindrical shape that can rotate about a rotation axis that coincides with the rotation axis of the second pressurizing section 311, and a continuous sawtooth gear can be formed along its outer circumferential surface.

[0073] The operating gear section 312 receives the rotational driving force from the second drive unit 400, which can rotate the second pressurizing section 311. The operating gear section 312 and the second pressurizing section 311 can rotate at the same angular velocity.

[0074] The first transmission gear 320 receives rotational driving force from the drive gear 410 of the second drive unit 400, enabling it to rotate the second pressure roller 310.

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

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

[0077] The first transmission gear 320 can be gear-driven by meshing with the sawtooth formed on the drive gear 410. The first transmission gear 320 can be located above the drive gear 410 and between the drive gear 410 and the second pressure roller 310.

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

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

[0080] The first pulley portion 322 is formed to protrude cylindrically on 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, which will be described later. A first guide groove 322a can be formed along the outer circumference of the first pulley portion 322 so as to guide the transmission line 500. The transmission line 500 can be moved in a circulating manner by the frictional force with the first pulley portion 322 as the first pulley portion 322 is rotated.

[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 is formed in a gear shape and multiple units can be provided. Multiple second transmission gears 330 can be arranged sequentially at predetermined intervals relative to the first transmission gear 320 and can be positioned between a pair of adjacent second pressure rollers 310.

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

[0084] The sawtooth formed on the outer surface of the second transmission gear 330 meshes 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, allowing them to rotate relative to each other in a geared relationship. The rotation direction of the second transmission gear 330 and the rotation direction of the second pressure rollers 310 can be opposite to each other.

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

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

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

[0088] The second gear portion 341 can be gear-coupled with the second transmission gear 330. The second gear portion 341 is formed in a gear shape, and sawtooth teeth that mesh with the sawtooth teeth of the second transmission gear 330 can be formed on its outer surface.

[0089] The second pulley portion 342 can be formed projecting in the direction of the rotation axis on one surface of the second gear portion 341. The second pulley portion 342 can be in contact with the transmission line 500.

[0090] The third transmission gear 340 receives rotational driving force from the second drive unit 400 via the second pressurizing section 311 and can also be connected to the first pulley section 322 and the operating gear section 312 via the transmission line 500.

[0091] A second guide groove 342a can be formed along the periphery of the second pulley portion 342 so as to guide the transmission line 500. The second guide groove 342a can be formed with a continuous sawtooth pattern to improve the frictional force with the transmission line 500.

[0092] The second protective plate 350 is positioned at the upper end of the second rolling press 300 and can be positioned between each of the multiple second pressure rollers 310.

[0093] Referring to Figure 4(b), a plurality of second protective plates 350, each having a flat surface, are arranged at one end of the second rolling press 300, and the second pressure roller 310 can protrude to one side beyond the second protective plates. More specifically, the second protective plates 350 are formed with a flat upper surface, and the second pressure roller 310 can protrude above the second protective plates 350. The second pressure roller 310 can be exposed and protrude through the space between the second protective plates 350 and adjacent second protective plates 350. Because the second pressure roller 310 protrudes above the second protective plates 350, the secondary battery can be pressurized by the second pressure roller 310. The second protective plates 350 can prevent the secondary battery from flowing into the space between the second pressure roller 310 and adjacent second pressure roller 310. The second protective plate 350 can guide the secondary battery, which is moving 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 unit 400 may be a rotary drive unit, but is not limited to that; for example, it may be a motor.

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

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

[0097] The second drive unit 400 is coupled to the second rolling press 300, and at least a portion of it can be located inside the second rolling press 300.

[0098] The drive gear 410 is formed in a gear shape and can be coupled to the rotating shaft of the second drive unit 400. The drive gear 410 is positioned on one surface of the second rolling press 300 and rotates in direct mesh with the first gear portion 321 of the first transmission gear 320, thereby transmitting the rotational driving force of the second drive unit 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 drive unit 400 to the first pressure roller 110 and the mediating roller 130, thereby allowing the first pressure roller 110 and the mediating roller 130 to rotate.

[0101] The transmission line 500 can be formed from a material that is flexible, deformable, and elastically resilient. The transmission line 500 may, but is not limited to, include a rubber material.

[0102] The transmission line 500 is in contact with the first pulley section 322, the drive force transmission section 112, the mediating roller 130, and the second pulley section 342. When the first pulley section 322 is rotationally driven, the transmission line 500 can circulate and move through the first pulley section 322, the drive force transmission section 112, the mediating roller 130, and the second pulley section 342. The drive force transmission section 112 and the mediating roller 130 can receive rotational driving force through the circulating movement of the transmission line 500. That is, the rotational drive of the second drive device 400 not only rotates 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, but also rotates the first pressure roller 110 and the mediating roller 130, which are connected via the transmission line 500.

[0103] When the first rolling press 100 and the second rolling press 300 are driven by the first drive unit 200 so that they move away from each other, tension can be formed in the transmission line 500 by the pulling force exerted by the first rolling press 100 and the second rolling press. When the first rolling press 100 and the second rolling press 300 are driven so that they move closer to each other, tension can be formed by the forces exerted by the multiple tensioners 140 to push the transmission line 500 in both directions.

[0104] The tension formed in the transmission line 500 causes the transmission line 500 to be in close contact with the first pulley portion 322, the drive force transmission portion 112, the mediating roller 130, and the second pulley portion 342 that are in contact with the transmission line 500, thereby increasing the frictional force at the contact surface between the configuration and the transmission line 500. As a result, the first pulley portion 322, the drive force transmission portion 112, the mediating roller 130, and the second pulley portion 342 can be rotated as a single unit.

[0105] Since the transmission line 500 is arranged in a zigzag pattern so that the upper surface of the drive force transmission section 112 of the first pressure roller 110 and the lower surface of the mediating roller 130 repeatedly come into contact, the contact area between the drive force transmission section 112 and the transmission line 500 increases, the frictional force between the transmission line 500 and the drive force transmission section 112 increases, and the multiple sequentially arranged drive force transmission sections 112 can rotate together as a unit at the same angular velocity.

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

[0107] 10: Degassing device for secondary batteries 100: First Rolling Press 110: First pressure roller 111: First pressurization section 112: Power transmission section 112a, 112b: Mounting groove 120: First protective plate 130: Intermediate Roller 140: Tensioner 150: Guide rail 160: Support Unit 200: First drive unit 300: Second Rolling Press 310: Second pressure roller 311: Second pressurization section 312: Operating gear section 320: First transmission gear 321: First Gear Section 322: First pulley section 322a: First guide groove 330: Second transmission gear 340: Third 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 in which multiple first pressure rollers are attached at predetermined intervals, A second rolling press is positioned opposite the first rolling press and has a plurality of second pressure rollers attached at predetermined intervals, A first drive device for varying the distance between the first rolling press and the second rolling press, A second drive device for rotationally driving the first pressure roller and the second pressure roller, A secondary battery degassing device including, The first pressure roller and the second pressure roller are in rolling contact with and pressurize a secondary battery placed between the first rolling press and the second rolling press in a secondary battery degassing device.

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

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

4. A plurality of first protective plates, each having a flat surface, are arranged at one end of the first rolling press. The first protective plate is positioned between a plurality of the first pressure rollers. The secondary battery degassing device according to any one of claims 1 to 3, wherein the first pressure roller protrudes to one side of the first protective plate.

5. The second rolling press is, A drive gear coupled to the second drive unit and rotated, 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 have interlocking sawtooth teeth formed on them.

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

8. The second rolling press is, The secondary battery degassing device according to claim 5, further comprising a plurality of second transmission gears arranged sequentially at predetermined intervals with respect to the first transmission gear and positioned between a pair of adjacent second pressure rollers.

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

10. The first transmission gear is The first gear section is gear-coupled with the aforementioned 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 contacts the transmission line.

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

12. The secondary battery degassing device according to claim 10, further comprising a tensioner that increases the tension of the transmission line when the first drive device is driven so that the first rolling press and the second rolling press are brought closer together.

13. One end of the tensioner is hinged 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 drive device is driven so that the first rolling press and the second rolling press move closer together, the other end of the tensioner pressurizes the transmission line outward.

14. The first rolling press includes a plurality of mediating rollers, each positioned between a plurality of the first pressure rollers. The secondary battery degassing device according to claim 10, wherein the transmission line repeatedly contacts the upper surfaces of the plurality of first pressure rollers and the lower surfaces of the plurality of mediating rollers, causing the first pressure rollers and the mediating rollers to rotate.

15. The second rolling press is, The secondary battery degassing device according to claim 10, further comprising a third transmission gear positioned adjacent to the second transmission gear furthest 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 the third transmission gear and the first pressure roller.

17. The third transmission gear is The second gear section 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 contacts the transmission line.

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

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

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

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