Transfer device for transferring battery cells into which electrolyte has been injected

Abstract

The present invention relates to a transfer device for transferring a pouch battery cell injected with an electrolyte. The transfer device includes a vertical guide supporting the pouch cell, a gripper for fixing a surface of the pouch cell by the weight of the pouch cell, and a pressure unit for controlling fluid movement of the electrolyte injected therein. This reduces the fluid movement of the electrolyte when the pouch cell is transferred, and thus has an advantage in that it is possible to improve the interfacial peeling between the electrode and the separator, the folding phenomenon of the separator, and the like that occurs as a result.

Description

[Technical Field]

[0001] The present invention relates to a device for transporting unsealed pouch batteries filled with electrolyte. This application claims the benefit of priority from Korean Patent Application No. 10-2022-0090528, filed July 21, 2022, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference. [Background technology]

[0002] BACKGROUND ART In recent years, secondary batteries have been widely used not only in small devices such as portable electronic devices but also in medium to large devices such as battery packs for hybrid cars and electric cars or power storage devices.

[0003] Such secondary batteries are composed of a battery cell and an electrolyte inside a case. The battery cell is made of a material that can insert and extract lithium ions and is composed of anodes and cathodes that are alternately stacked, and a separator inserted between the cathodes to prevent direct contact between the cathodes and anodes.

[0004] After the battery cells are inserted into the secondary battery case and the electrolyte is injected, the secondary battery is housed in a carrier and transported to a desired location for additional processes such as sealing the side of the case. This housing and transportation of the secondary battery is performed automatically.

[0005] During this process, fluid movement of the internal electrolyte, such as sloshing, occurs in secondary batteries due to the movement and stopping of carriers during the transport process. This fluid movement of the electrolyte can cause the interface between the electrode and the separator to peel off or the separator to fold into the electrode. This peeling between the electrode and the separator or folding of the separator can lead to short circuits due to external exposure of the negative electrode, which can lead to issues such as battery fire and reduced safety. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Korean Patent Publication No. 10-2015-0027689 [Patent Document 2] Korean Patent Publication No. 10-2021-0011261 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, an object of the present invention is to provide a battery cell transport device that can prevent interfacial peeling or folding of a separator due to fluid movement of an electrolyte when transporting a secondary battery filled with an electrolyte before sealing, and a method for manufacturing a battery cell using the same. [Means for solving the problem]

[0008] To solve the above-mentioned problems, In one embodiment, the present invention comprises: A transfer device for a secondary battery for transferring an unsealed pouch cell into which an electrolyte solution has been injected, a transfer unit for transferring the pouch cell; and a gripping unit coupled to the transfer unit for fixing the pouch cell, The gripping unit includes a main body on which the pouch cell is mounted, a pair of vertical guides arranged parallel to each other on the upper surface of the main body and supporting both sides of the pouch cell, a gripper whose lower end is connected to the lower part of the vertical guide and is actuated by the weight of the pouch cell inserted between the pair of vertical guides, and a pressure unit connected to the upper end of the gripper and pressurizing the surface of the pouch cell.

[0009] In this case, the pressure unit may include a pressure guide located inside the vertical guide and controlling the fluid movement of the electrolyte by applying pressure to the surface of the pouch cell, and an elastic member disposed between the upper end of the gripper and the pressure guide.

[0010] In addition, the vertical guide may include an upper through-hole, and the pressure guide may be coupled to an upper end of the gripper via a connector inserted into the upper through-hole.

[0011] The pressure guide may also include a first guide bar that is arranged horizontally with the main body of the gripping part and is coupled to the connecting part, and one or more second guide bars that extend downward from the first guide bar.

[0012] Here, the first guide bar may be positioned at a height equal to or higher than the height of the electrolyte injected into the pouch cell.

[0013] In addition, the pressure guide may include a material containing one or more of epoxy resin, silicone, styrene-based rubber, butadiene-based rubber, polyurethane, soft PVC, and polypropylene copolymer on the pressure surface that contacts the pouch cell to prevent surface damage to the pouch cell.

[0014] Meanwhile, the vertical guide may include a lower through-hole.

[0015] The gripper may include a first frame that is inserted into a lower through-hole of the vertical guide in a diagonal direction based on the vertical guide and includes a protrusion that protrudes toward the inside of the vertical guide, and a second frame that is connected to the other end of the first frame having the protrusion so as to be bent horizontally with the vertical guide, and is connected to a pressure unit that presses the upper surface of the pouch cell at the other end of the end connected to the first frame.

[0016] In addition, the protrusion is disposed to contact the pouch cell, and can implement the up-and-down movement of the first frame according to the change in weight of the pouch cell when in contact with or out of contact with the pouch cell.

[0017] In this case, the protrusion may have a structure coated with one or more of epoxy resin, silicone, styrene-based rubber, butadiene-based rubber, polyurethane, soft PVC, and polypropylene copolymer to prevent surface damage to the inserted pouch cell. [Effects of the Invention]

[0018] The transfer device according to the present invention includes a vertical guide supporting the pouch cell, a gripper for fixing the surface of the pouch cell by the weight of the pouch cell, and a pressure unit for controlling the fluid movement of the electrolyte injected therein. This reduces the fluid movement of the electrolyte when the pouch cell is transferred, thereby advantageously improving the effect of preventing interfacial peeling between the electrode and the separator, folding of the separator, and the like. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a perspective view showing a gripping portion of a conventional transfer device used when transferring a pouch cell filled with an electrolyte solution. [Figure 2] FIG. 1 is a plan view showing a configuration of a transfer device according to the present invention. [Figure 3] 10A-10C are cross-sectional views showing the structure of the transfer device of the present invention with and without a pouch cell inserted. [Figure 4] 1 is a structural diagram showing an example of a pressure guide according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0020] Because the present invention is susceptible to various modifications and can have various embodiments, specific embodiments are described in detail in the detailed description.

[0021] However, this is not intended to limit the invention to any particular embodiment, but should be understood to include all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

[0022] In the present invention, the terms "comprise" and "have" are intended to specify the presence of features, numbers, steps, operations, components, parts or combinations thereof described in the specification, and should be understood as not precluding the presence or possibility of addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0023] Furthermore, in the present invention, when a layer, film, region, plate, or other portion is described as being "on" another portion, this includes not only the case where it is "directly on" the other portion, but also the case where there is another portion therebetween. Conversely, when a layer, film, region, plate, or other portion is described as being "under" the other portion, this includes not only the case where it is "directly under" the other portion, but also the case where there is another portion therebetween. Furthermore, in this application, being "located on" can include not only the case where it is located at the top, but also the case where it is located at the bottom.

[0024] The present invention will now be described in more detail.

[0025] <Transfer device> In one embodiment, the present invention comprises: a transfer unit for transferring the pouch cell; and a gripping unit coupled to the transfer unit for fixing the pouch cell, The gripping unit includes a main body on which the pouch cell is mounted, a pair of vertical guides arranged parallel to each other on the upper surface of the main body and supporting both sides of the pouch cell, a gripper whose lower end is connected to the lower part of the vertical guide and is actuated by the weight of the pouch cell inserted between the pair of vertical guides, and a pressure unit connected to the upper end of the gripper and pressurizing the surface of the pouch cell.

[0026] The transfer device according to the present invention is used for transferring secondary batteries between processes during the manufacture of secondary batteries, and specifically, may be used in the process of assembling pouch-shaped secondary batteries, in which an electrolyte solution is injected into a pouch having an electrode assembly inserted therein and the pouch is transferred in an unsealed state.

[0027] Fig. 1 is a perspective view schematically illustrating a conventional transfer device. Referring to Fig. 1, the conventional transfer device 1 includes a main body 10 that supports a pouch cell E-PC at its lower portion and moves the supported pouch cell E-PC, and a pair of vertical guides 20 that support and secure both sides of the pouch cell E-PC are disposed on the upper surface of the main body 10. While this transfer device 1 is useful for moving pouch cells E-PC, it has limitations in suppressing fluid movement of the electrolyte inside the pouch cell, i.e., sloshing of the electrolyte, that occurs when the pouch cell moves.

[0028] However, the transfer device according to the present invention can control the fluid movement of the electrolyte in the pouch cell by using a gripper including a pressure guide that controls the fluid movement of the electrolyte injected inside while fixing both sides of the pouch cell to a vertical guide that supports the unsealed pouch cell into which the electrolyte has been injected using the weight of the pouch cell. More specifically, Figures 2 and 3 are a plan view and a cross-sectional view that schematically show the structure of the transfer device according to the present invention. Referring to Figures 2 and 3, the transfer device 100 according to the present invention includes a transfer unit (not shown) for transferring the pouch cell and a gripping unit 100 coupled to the transfer unit to secure the pouch cell. The gripping unit 100 includes a main body 110 on which a pouch cell is mounted, a pair of vertical guides 120 arranged parallel to each other on the top surface of the main body 100 and supporting both sides of the pouch cell E-PC, a gripper 130 whose lower end is connected to the lower part of the vertical guide 120 and which is actuated by the weight of the pouch cell E-PC inserted between the pair of vertical guides 120, and a pressure unit 140 connected to the upper end of the gripper 130 and pressurizing the surface of the pouch cell E-PC.

[0029] Here, the main body 110 and vertical guide 120 support the unsealed pouch cell E-PC filled with electrolyte in the longitudinal direction and transport it in a vertically standing state. To this end, the main body 110 may be positioned below the pouch cell E-PC to support the pouch cell E-PC, and may be connected to a transport unit (not shown) including a conveyor belt and a drive roller for rotating the conveyor belt to transport the pouch cell, thereby transporting the pouch cell supported above. The main body 110 may be configured to support the pouch cell E-PC from below and to be connected to the transport unit without any particular limitation.

[0030] The vertical guides 120 may be arranged in a pair on the left and right sides on the upper surface of the main body 110. The pair of left and right vertical guides 120 may form a storage space therebetween that is open at the top and closed at the bottom. Pouch cells E-PC may be stored and supported in the storage space. Here, the vertical guides 120 are not particularly limited as long as they have a structure that can support pouch cells E-PC.

[0031] As one example, the vertical guide 120 may have the form of a pair of vertical bars, as shown in Figures 2 and 3. In this case, the vertical guide 120 may be in close contact with the surface of the pouch cell E-PC when the pouch cell E-PC is stored, but may be spaced apart enough so as not to pressurize the surface of the pouch cell so as to prevent the electrolyte injected inside the pouch cell from leaking out. Furthermore, the vertical bars may be provided in multiple pairs, specifically two or more pairs, more specifically two to five pairs, or two to four pairs, on the upper surface of the body 110 to reduce shaking of the battery when the pouch cell E-PC is transported.

[0032] As another example, the vertical guide 120 may have the form of a pair of diaphragms, in which case the diaphragms may be disposed at the center of both sides of the pouch cell E-PC.

[0033] In addition, the vertical guide 120 supports the pouch cell E-PC so that it stands vertically during transportation and has a configuration for reducing the fluid movement of the electrolyte E injected inside the supported pouch cell E-PC, specifically, a structure in which a gripper 130 and a pressure unit 140 are connected.

[0034] The gripper 130 serves to secure the surface of the pouch cell 130 to minimize shaking of the pouch cell 130 filled with electrolyte during transportation. The lower end of the gripper 130 is connected to the lower portion of the vertical guide 120 and is actuated by the weight of the inserted pouch cell 130. For this purpose, as shown in FIG. 3, the vertical guide 120 may include a lower through-hole 121 to allow contact between the inserted pouch cell 130 and the gripper 130. Specifically, the gripper 130 may include a first frame 130a inserted into the lower through-hole 121 in a diagonal direction relative to the vertical guide 120, and a second frame 130b connected to the first frame 130a at the outside of the vertical guide 120 so as to be bent parallel to the vertical guide 120. The other end of the second frame 130b connected to the first frame 130a is connected to the pressure unit 140.

[0035] Here, the first frame 130a is inserted into a lower through-hole 121 provided at the bottom of the vertical guide 120 in a diagonal direction based on the vertical guide 120, and an end portion thereof may protrude a predetermined length inside the vertical guide 120. The protruding end portion, i.e., protrusion 131, may move up and down due to the weight of the pouch cell E-PC inserted inside the vertical guide 120, and thus the pouch cell E-PC may be fixed by the left and right movement of the upper end portion of the gripper 130.

[0036] 3(b), when a pouch cell E-PC is inserted into the gripping unit 100, the protrusion 131 may come into contact with the lower end or bottom of the pouch cell E-PC and may be pushed downward by the weight of the contacted pouch cell E-PC. The downward movement of the protrusion 131 may induce upward movement of the other end of the first frame 130a on which the protrusion is provided, i.e., the connecting portion with the second frame 130b. This upward movement may induce left-right movement of the second frame 130b inside the vertical guide 120, thereby pressing and / or fixing the surface of the pouch cell E-PC.

[0037] 3(a), when the pouch cell E-PC is removed from the gripping unit 100, the protrusion 131 may move upward due to the weight of the pouch cell E-PC applied to the lower end or bottom being removed. This upward movement of the protrusion 131 may induce downward movement of the other end of the first frame 130a on which the protrusion is provided, i.e., the connecting portion with the second frame 130b. This downward movement may induce left-right movement of the second frame 130b outside the vertical guide 120, thereby removing pressure and / or fixation applied to the surface of the pouch cell E-PC.

[0038] Meanwhile, the protrusion 131 may have a tapered end that is rounded along the insertion direction of the pouch cell E-PC to prevent surface damage to the pouch cell E-PC when it comes into contact with the protrusion. In some cases, the end surface may be coated with one or more resins selected from the group consisting of epoxy, silicone, styrene-based rubber, butadiene-based rubber, polyurethane, soft PVC, and polypropylene copolymer. The resin has elasticity, which can minimize surface damage when the protrusion comes into contact with the pouch cell E-PC.

[0039] Furthermore, the pressure unit 140 is provided on the upper end of the second frame 130b of the gripper 130 and can apply pressure to the surface of the pouch cell E-PC in response to the left-right movement of the second frame 130b, thereby controlling the fluid movement of the electrolyte present inside the pouch cell E-PC.

[0040] For this purpose, the pressure unit 140 may include a pressure guide 142 located inside the vertical guide to pressurize and fix the surface of the pouch cell E-PC and control the fluid movement of the electrolyte E inside the cell, and an elastic member 141 disposed between the upper end of the gripper, specifically the upper end of the second frame 130b, and the pressure guide 142.

[0041] Here, the vertical guide 120 may include an upper through-hole 122 for connecting the gripper 130 positioned outside the vertical guide 120 with the pressure guide 142 positioned inside the vertical guide 120. The pressure guide 142 may be connected to an upper end of the gripper 130, specifically, an upper end of the second frame 130b, via a connecting part inserted into the through-hole 122. Here, the connecting part may have an elastic member 141 installed therein. The elastic member 141 is provided at a connecting part disposed between the gripper 130 and the pressure guide 142. When the second frame 130b provided on the gripper 130 moves left and right, pressure is directly applied to the pressure guide 142 to prevent damage to the inserted pouch cell E-PC, and an elastic force due to the applied pressure is applied to the pressure guide 142, thereby firmly fixing the pouch cell E-PC.

[0042] Furthermore, the pressure guide 142 applies pressure to the surface of the pouch cell E-PC when the gripper 130 fixes the surface of the pouch cell E-PC in response to the left-right movement of the second frame 130b.

[0043] This pressure action can minimize the gap between the pouch and the electrode assembly S inside the pouch in the area where the pressure guide 142 comes into contact. As a result, the pressure guide 142 can suppress fluid movement, such as sloshing, of the remaining electrolyte E that is not impregnated in the electrode assembly S inside the pouch when the pouch cell E-PC moves.

[0044] In this case, the pressure guide 142 may include a first guide bar 142a arranged horizontally with the main body 110 of the gripping part 100 and connected to a connecting part including the elastic member 141, and one or more second guide bars 142b extended downward from the first guide bar 142a.

[0045] The first guide bar 142a may play a role in controlling the vertical movement of the electrolyte E present inside the pouch cell E-PC and may be positioned at a height equal to or higher than the height of the electrolyte when the pouch cell E-PC is not being transported. As a result, the first guide bar 142a may prevent the electrolyte E from overflowing inside the pouch cell E-PC during transport and, at the same time, may minimize damage to the side surfaces of the electrode assembly S that are exposed during transport.

[0046] In addition, the first guide bar 142a may have an elastic member 141 disposed at the center thereof, which is connected to the second frame 130b of the gripper. In this case, the force applied to the first guide bar 142a through the elastic member 141 may be evenly distributed throughout the guide bar, thereby easily controlling the fluid movement of the electrolyte solution E without damaging the surface of the pouch cell E-PC.

[0047] In addition, the second guide bar 142b may be extended below the first guide bar 142a and may serve as a barrier to control horizontal movement of the electrolyte solution E present inside the pouch cell E-PC when the pressure guide 142 is pressed. In this case, the second guide bar 142b may have a form in which one or more second guide bars 142b are extended from the first guide bar 142a, specifically, one to five, one to three, or two to four second guide bars 142b are extended.

[0048] As an example, the pressure guide 242 according to the present invention may have a T-shape, an N-shape, an M-shape, or the like, with one to three second guide bars 142b extending downward from a first guide bar 142a, as shown in (a) to (c) of Figure 4.

[0049] Furthermore, when two or more pairs of vertical guides are present on the main body, the pressure guide may be connected to the gripper provided on each vertical guide, and in this case, the connected pressure guide may have a form that is combined with the adjacent pressure guide.

[0050] As one example, when two pairs of vertical guides are present on the main body, the pressure guide 242 according to the present invention may be individually connected to the grippers provided on each vertical guide via the elastic member 241. The connected pressure guide 242 may have a shape in which it is coupled with the adjacent pressure guide 242, as shown in Fig. 4(d).

[0051] In this case, the pressure guide 242 can more effectively control the fluid movement of the electrolyte E injected into the pouch cell E-PC, particularly the fluid movement of the electrolyte E occurring at the edge of the electrode assembly S. As a result, folding and damage to the separator included in the electrode assembly S can be minimized.

[0052] Furthermore, the pressure guide 142 may include an elastic material on the pressure surface that contacts the pouch cell E-PC. Specifically, the pressure guide 142 may be provided with a sheet, pad, film, etc. made of an elastic material on the pressure surface that contacts the surface to minimize surface damage of the pouch cell E-PC. The material is not particularly limited as long as it has elasticity, but may specifically include one or more of epoxy resin, silicone, styrene-based rubber, butadiene-based rubber, polyurethane, soft PVC, and polypropylene copolymer.

[0053] Meanwhile, the elastic member 141 may be introduced into a connecting portion located between the second frame 130b of the gripper 130 and the pressure guide 142, more specifically, between the second frame 130b and the pressure guide 142. As a result, the elastic member 141 may apply an elastic force when the second frame 130b moves left and right due to the weight of the pouch cell E-PC inserted inside the vertical guide 120, thereby enabling the pressure guide 142 to more firmly fix the surface of the pouch cell E-PC and preventing damage to the surface of the pouch cell E-PC due to excessive pressure.

[0054] 3, when a pouch cell E-PC is inserted between a pair of vertical guides 120, the weight of the pouch cell E-PC causes the protrusion 131 of the first frame 130a to move downward. At this time, the upper end of the second frame 130b moves left and right toward the inside of the vertical guides 120. In addition, the elastic member 141 located between the upper end of the second frame 130b and the pressure guide 142 may contract to more firmly fix the inserted pouch cell E-PC.

[0055] Furthermore, the elastic member 141 is not particularly limited as long as it can apply elastic force by contracting and expanding between the second frame 130b and the pressure guide 142, but specifically may include a spring, an elastic foam, an elastic structure, etc.

[0056] The transfer device according to the present invention, having the above-described configuration, can reduce the fluid momentum of the electrolyte inside the pouch cell, thereby reducing interfacial peeling between the electrode and the separator, folding of the separator, and other phenomena that may occur due to the fluid movement of the electrolyte, thereby improving battery safety by preventing internal short circuits, battery fires, and the like.

[0057] <How to move pouch cells> In one embodiment, the present invention further comprises: A method for transferring pouch cells using the transfer device according to the present invention is provided.

[0058] Specifically, the pouch cell moving method may involve mounting a pouch cell, in which an electrode assembly is inserted into a battery pouch, on a transfer device according to the present invention before injecting an electrolyte solution, and then operating the transfer device to which the pouch cell is mounted to move the pouch cell for the electrolyte injection process and the pouch cell sealing process.

[0059] The method for moving a pouch cell according to the present invention can prevent sloshing of the electrolyte solution in the pouch cell that occurs during movement using the transfer device of the present invention, thereby preventing interfacial peeling between the electrodes and the separator, folding of the separator, and the like that occur inside the pouch cell when an unsealed pouch cell filled with electrolyte is moved.

[0060] The present invention will be described in more detail below with reference to examples and experimental examples.

[0061] However, the following examples and experimental examples are merely illustrative of the present invention, and the content of the present invention is not limited to the following examples and experimental examples.

[0062] <Examples and Comparative Examples> An unsealed pouch cell with an electrode assembly inserted into a battery pouch was prepared and loaded into a transfer device. The transfer device was then used to transfer the pouch cell to an electrolyte injection device, where electrolyte was injected into the pouch cell. The unsealed pouch cell was then transferred to a pouch sealing machine using the transfer device. The electrode assembly and electrolyte were separated from the transferred pouch cell, and the occurrence of separator folding was confirmed and the amount of electrolyte loss was measured. This process was repeated 100 times to calculate the separator folding rate and electrolyte loss rate, and the results are shown in Table 1.

[0063] In this case, the transfer device used to move each pouch cell was equipped with a gripping unit having the structure shown in Figure 1 or Figure 2, as shown in Table 1, and when equipped with a gripping unit having the structure shown in Figure 2, the shape of the pressure guide was adjusted to the shape shown in Figure 4.

[0064] [Table 1]

[0065] As shown in Table 1, the transfer device according to the present invention reduces fluid movement such as electrolyte sloshing in an unsealed pouch cell into which electrolyte is injected, and improves the folding phenomenon of the separator and loss of electrolyte.

[0066] Although the present invention has been described above with reference to preferred embodiments, it will be understood by those skilled in the art or those with ordinary knowledge in the art that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the present invention as set forth in the claims below.

[0067] Therefore, the technical scope of the present invention should not be limited to the content described in the Summary of the Invention of the specification, but should be defined by the claims. [Explanation of symbols]

[0068] 1: Conventional transfer device 100: Gripping unit 10, 110: Main body 20, 120: Vertical guide 121: Lower through hole 122: Upper through hole 130: Gripper 130a: First frame 130b: Second frame 131: Protrusion 140 and 240: Pressure section 141, 241: Elastic member 142, 242: Pressure guide 242a: First guide bar 242b: Second guide bar E-PC: Unsealed pouch cell filled with electrolyte SD: Pouch cell movement direction / Transfer device movement direction E: Electrolyte S: Electrode assembly

Claims

1. A transfer device for a secondary battery for transferring an unsealed pouch cell into which an electrolyte solution has been injected, a conveying unit for conveying the pouch cell; and a gripping unit coupled to the conveying unit for fixing the pouch cell, The gripping portion is a main body on which the pouch cell is mounted; a pair of vertical guides arranged parallel to each other on the upper surface of the main body and supporting both surfaces of the pouch cell; a gripper whose lower end is connected to the lower portion of the vertical guide, which contacts the pouch cell inserted between the pair of vertical guides, and which is actuated by the weight of the pouch cell; a pressure unit connected to an upper end of the gripper and pressing a surface of the pouch cell.

2. The pressure applying unit is a pressure guide positioned inside the vertical guide and applying pressure to the surface of the pouch cell to control the fluid movement of the electrolyte; The transfer device for a secondary battery according to claim 1 , further comprising: an elastic member disposed between an upper end of the gripper and the pressure guide.

3. the vertical guide includes an upper through hole; The transfer device for a secondary battery according to claim 2 , wherein the pressure guide is coupled to an upper end of the gripper through a connecting portion inserted into the upper through-hole.

4. The pressure guide is a first guide bar disposed horizontally with the main body of the gripping part and coupled to the connecting part; The transfer device for a secondary battery according to claim 3 , further comprising: one or more second guide bars extending downward from the first guide bar.

5. The transfer device for a secondary battery according to claim 4 , wherein the first guide bar is positioned at a height equal to or higher than the height of the electrolyte injected into the pouch cell.

6. 3. The transfer device for a secondary battery according to claim 2, wherein the pressure guide includes a material including at least one of epoxy resin, silicone, styrene-based rubber, butadiene-based rubber, polyurethane, soft PVC, and polypropylene copolymer on a pressure surface that contacts the pouch cell.

7. The transfer device for secondary batteries according to claim 1 , wherein the vertical guide comprises a lower through-hole.

8. The gripper is a first frame including a protrusion inserted into the lower through-hole of the vertical guide in a diagonal direction relative to the vertical guide and protruding toward an inner side of the vertical guide; 8. The transfer device for secondary batteries according to claim 7, further comprising: a second frame connected to the other end of the first frame, the second frame being bent and connected to a pressing part that presses an upper surface of the pouch cell at the other end of the end connected to the first frame, the second frame having a protrusion that is parallel to the vertical guide.

9. 9. The transfer device for a secondary battery according to claim 8, wherein the protrusion is arranged to contact the pouch cell and performs an up-and-down movement of the first frame in response to a change in weight of the pouch cell when in contact with or out of contact with the pouch cell.

10. 10. The transfer device for a secondary battery according to claim 8, wherein the protrusion has a structure coated with one or more resins selected from the group consisting of epoxy, silicone, styrene-based rubber, butadiene-based rubber, polyurethane, soft PVC, and polypropylene copolymer.

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