Transfer device for secondary batteries

Abstract

The present invention relates to a transfer device for a secondary battery, and more particularly, to a transfer device for a secondary battery including an electrode assembly in which electrodes and a separator are alternately laminated and a battery case for housing the electrode assembly. The present invention provides a transfer device for a secondary battery, in a manufacturing apparatus for a secondary battery including an electrode assembly in which electrodes and a separator are alternately laminated, and a battery case for housing the electrode assembly, the transfer device including a pair of storage part grippers for gripping a storage part in which the electrode assembly is stored in the battery case, and a pair of frame part grippers for gripping a frame part extended from a frame of the storage part in the battery case.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0091362 dated July 22, 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 transfer device for a secondary battery, and more particularly to a transfer device for a secondary battery including an electrode assembly in which electrodes and separators are alternately stacked, and a battery case that houses the electrode assembly. [Background technology]

[0003] Unlike primary batteries, secondary batteries are rechargeable and have been the subject of much research and development in recent years due to their potential for miniaturization and large capacity. With the development of technology and increasing demand for mobile devices, the demand for secondary batteries as an energy source is rapidly increasing.

[0004] Secondary batteries are classified into coin-type batteries, cylindrical batteries, prismatic batteries, and pouch-type batteries depending on the shape of the battery case. The electrode assembly attached to the inside of the battery case in a secondary battery is a power generating element that can be charged and discharged and has a laminated structure of electrodes and a separator.

[0005] Electrode assemblies can be broadly classified into a jelly roll type in which a separator is interposed between sheet-like positive and negative electrodes coated with an active material and wound up, a stack type in which multiple positive and negative electrodes are stacked in sequence with a separator interposed therebetween, and a stack / folding type in which a stack-type unit cell is wound up with a long separator film.

[0006] Recently, pouch-type secondary batteries, which have a structure in which a stacked or stacked / folded electrode assembly is housed in a battery case made of an aluminum laminate sheet, have been attracting much attention due to their low manufacturing cost, small weight, and easy shape modification, and their usage is gradually increasing.

[0007] Such a pouch-type secondary battery is manufactured through secondary battery manufacturing processes, such as an assembly process of housing an electrode assembly together with an electrolyte inside a battery case; a sealing process of sealing the battery case; and an activation process of activating the electrode assembly.

[0008] Meanwhile, transportation of the secondary battery is essential in the manufacturing process of such a secondary battery. However, defects such as separator folding can occur during transportation of the secondary battery. That is, during transportation of a secondary battery containing an electrode assembly and electrolyte in a battery case, electrolyte bias can occur. This bias can cause a portion of the separator of the electrode assembly, particularly a portion of the outermost separator on the electrode tab side, to fold. This can cause problems that adversely affect the quality of the secondary battery, and therefore, there is a need to develop a technology to address this issue. Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been devised to solve the above problems, and an object of the present invention is to provide a transfer device for a secondary battery that can prevent defects such as separator breakage during the secondary battery manufacturing process. [Means for solving the problem]

[0010] The present invention relates to a secondary battery including an electrode assembly in which electrodes and separators are alternately stacked; and a battery case that houses the electrode assembly. Transfer device a pair of housing grippers for gripping a housing portion in the battery case in which the electrode assembly is housed; and a pair of frame grippers for gripping a frame portion in the battery case extending from a frame of the housing portion.

[0011] The bin gripper may be arranged to grip an edge of the bin.

[0012] The secondary battery may further include an electrode lead formed to protrude from at least one end of the battery case; and the storage portion gripper may be configured to grip an edge of the storage portion adjacent to the electrode lead.

[0013] The frame gripper may include a pair of gripper units that are disposed opposite each other across the battery case and whose distance from each other is adjustable.

[0014] The end of the gripper unit may be formed so that a surface facing the battery case is inclined toward the opposite direction from the battery case toward the end.

[0015] The frame gripper may further include a friction pad provided on a surface of the gripper unit facing the battery case.

[0016] The material of the friction pad may include rubber.

[0017] The storage gripper may include a pair of gripper units facing each other across the battery case, the distance between which is adjustable.

[0018] The end of the gripper unit may be formed so that a surface facing the battery case is inclined toward the opposite direction from the battery case toward the end.

[0019] The receiving portion gripper may further include a buffer pad provided on a surface of the gripper unit facing the battery case.

[0020] The material of the buffer pad may include EVA (Ethylene-Vinyl Acetate).

[0021] The gripper may further include at least one connecting portion connecting the storage portion gripper and the frame portion gripper.

[0022] The storage gripper, the frame gripper, and the connecting portion may be detachably coupled to one another.

[0023] The connecting part may have at least one through-hole formed on one side thereof; and may further include a fixing part that passes through the through-hole and is fixedly coupled to the receiving part gripper.

[0024] The through hole has an oval shape formed long along the thickness direction of the connecting portion; and the height of the storage portion gripper relative to the connecting portion may be adjusted depending on the coupling position of the fixing portion relative to the through hole.

[0025] Meanwhile, the transfer device for a secondary battery according to the present invention may further include a position moving unit connected to one of the frame gripper and the container gripper and moving the positions of the frame gripper and the container gripper.

[0026] The position moving unit includes a main body; and a pair of arm units connected to the main body and at least one of the frame gripper and the storage unit gripper; the pair of arm units may be rotatable in an arc from the main body so that their respective positions can be changed. [Effects of the Invention]

[0027] The present invention has an advantage that the battery case includes a pair of receiving portion grippers that grip the receiving portion in which the electrode assembly is received, thereby preventing the separator of the electrode assembly from being broken due to the flow of electrolyte when the secondary battery is transported. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 2 is a front view of the secondary battery. [Figure 2] 1 is a plan view showing a secondary battery transport device according to a first embodiment of the present invention. [Figure 3]3 is a side view showing in detail the storage section gripper, the frame section gripper, the connecting section, and the arm section in the secondary battery transport device of FIG. 2. FIG. [Figure 4] 3 is a rear view showing in detail the storage section gripper, the frame section gripper, the connecting section, and the arm section in the secondary battery transport device of FIG. 2. FIG. [Figure 5a] 3A to 3C are conceptual diagrams sequentially showing the secondary battery transport device of FIG. 2 transporting the secondary battery. [Figure 5b] 3A to 3C are conceptual diagrams sequentially showing the secondary battery transport device of FIG. 2 transporting the secondary battery. [Figure 5c] 3A to 3C are conceptual diagrams sequentially showing the secondary battery transport device of FIG. 2 transporting the secondary battery. [Figure 5d] 3A to 3C are conceptual diagrams sequentially showing the secondary battery transport device of FIG. 2 transporting the secondary battery. [Figure 6] FIG. 10 is a side view showing in more detail a gripper unit of a storage section gripper in a transfer device for a secondary battery according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a side view showing in more detail a gripper unit of a frame gripper in a transfer device for a secondary battery according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention will now be described in detail with reference to the accompanying drawings, in order to enable those skilled in the art to easily carry out the present invention. However, the present invention may be embodied in various different forms and should not be construed as being limited to the following embodiments.

[0030] 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 when referring to components in each drawing in this specification, the same or similar reference symbols will be used throughout the specification to refer to the same or similar components.

[0031] 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, in accordance with the principle that an inventor can appropriately define the concept of a term in order to best explain his or her invention.

[0032] Example 1 The present invention relates to a secondary battery 10 including an electrode assembly 11 in which electrodes and separators are alternately stacked; and a battery case 12 that houses the electrode assembly 11. Transfer device In the battery case 12, a transfer device 100 for a secondary battery is provided, which includes a pair of storage grippers 110 for gripping a storage portion 12a in which the electrode assembly 11 is stored in the battery case 12; and a pair of frame grippers 120 for gripping a frame portion 12b in the battery case 12 extending from the frame of the storage portion 12a.

[0033] First, as shown in FIG. 1, the secondary battery 10 may include an electrode assembly 11 in which electrodes and separators are alternately stacked; and a battery case 12 that accommodates the electrode assembly 11.

[0034] Here, the electrode assembly 11 is configured by stacking electrodes and a separator, and may have various structures. For example, the electrode assembly 11 may have a structure in which a positive electrode current collector / positive electrode active material layer / separator / negative electrode active material layer / negative electrode current collector are stacked in this order, with the positive electrode active material layer facing one side of the separator and the negative electrode active material layer facing the other side. At least one electrode tab may be formed on the electrode, and the electrode tab may be electrically connected to an electrode lead 13, which will be described later. Note that the electrode assembly 11 is configured to be housed inside a battery case 12, and is represented by a dotted line in the drawing.

[0035] The battery case 12 in which the electrode assembly 11 is accommodated may include a receiving portion 12a in which the electrode assembly 11 is accommodated, and a frame portion 12b extending from the frame of the receiving portion 12a.

[0036] Specifically, the receiving portion 12a may be understood as a region in which an empty space is formed by forming a recess in a portion of the battery case 12. The electrode assembly 11 may be received in the empty space, and the electrolyte solution E may be injected into the empty space.

[0037] The frame 12b may extend from the frame of the receiving portion 12a and have a sealed edge structure. Such a sealed structure may be used to prevent the electrode assembly 11 received in the battery case 12 from being damaged by exposure to external moisture and air, and may be used to prevent the electrolyte solution E injected into the battery case 12 from leaking to the outside.

[0038] An electrode lead 13 may protrude from at least one end of the battery case 12. Here, the electrode lead 13 may be understood as a configuration in which one end is connected to the electrode assembly 11 inside the battery case 12 and the other end is electrically connected to an electric device or another secondary battery 10 outside the battery case 12.

[0039] Meanwhile, in the secondary battery 10 described above, the area of ​​the negative electrode must be large enough to cover the positive electrode to prevent lithium deposition, but for this reason, during the process of bonding the positive electrode / separator / negative electrode, the edge of the separator that is only present on the negative electrode can easily fold under the flow of electrolyte E. This folding phenomenon can particularly easily occur in the outermost separator on the edge on the electrode lead 13 or electrode tab side.

[0040] In addition, the secondary battery 10 may be moved with the front and rear sides of the secondary battery 10 inverted during transportation, and if the secondary battery 10 is rotated to invert the front and rear sides of the secondary battery 10, this may exacerbate the uneven distribution of the electrolyte E. Therefore, the rotation speed of the secondary battery 10 may be slowed down to reduce the degree of flow of the electrolyte E, but this may reduce production yield or cause other problems.

[0041] 2, the present invention provides a transfer device 100 for a secondary battery, which includes a container gripper 110 and a frame gripper 120, so as to prevent folding of a separator of an electrode assembly 11 while ensuring production volume when transferring the secondary battery 10. The container gripper 110 and the frame gripper 120 will be described in more detail below.

[0042] First, the receiving portion gripper 110 is configured to grip the receiving portion 12a of the battery case 12 in which the electrode assembly 11 is received, and may have various configurations.

[0043] Specifically, the storage section gripper 110 is configured to grip the secondary battery 10 together with the frame gripper 120 when transporting the secondary battery 10, and may be understood as a configuration that acts as a kind of dam to prevent the flow of the electrolyte E injected inside the storage section 12a of the battery case 12.

[0044] In this case, the storage unit gripper 110 can grip any area of ​​the storage unit 12a as long as it corresponds to the storage unit 12a. However, it may be preferable that the storage unit gripper 110 is installed so as to press the edge of the storage unit 12a where folding of the separation membrane easily occurs.

[0045] In this case, among the edges of the receiving portion 12a, the edge of the receiving portion 12a formed adjacent to the electrode tab and / or electrode lead 13 is an area that significantly affects the quality of the secondary battery 10 if folding of the separator occurs, and therefore it may be more preferable that the receiving portion gripper 110 is installed to pressurize the edge of the receiving portion 12a formed adjacent to the electrode lead 13 or the electrode tab.

[0046] The container gripper 110 can have any structure as long as it is capable of gripping the container 12a.

[0047] For example, as shown in FIG. 3 or 4, the storage section gripper 110 may include a pair of gripper units 111A and 111B that are arranged facing each other across the battery case 12 and whose spacing is adjustable.

[0048] Specifically, the pair of gripper units 111A, 111B are positioned on the upper and lower sides of the battery case 12, and are configured so that the distance between them can be adjusted based on the thickness direction of the battery case 12 (the direction aligned with the Z direction based on Figures 3 and 4), and can pressurize and grip the storage portion 12a.

[0049] In this case, the receiving portion gripper 110 may further include a buffer pad 112 provided on a surface of the gripper units 111A and 111B facing the battery case 12. The buffer pad 112 may include various materials, for example, EVA (Ethylene-Vinyl Acetate).

[0050] The buffer pad 112 can prevent damage to the surface of the receiving portion 12a when the gripper units 111A and 111B press the receiving portion 12a.

[0051] Meanwhile, the frame gripper 120 is configured to grip the frame 12b extending from the frame of the receiving portion 12a of the battery case 12, and may have various configurations.

[0052] Specifically, the frame gripper 120 is configured to grip the secondary battery 10 together with the storage gripper 110 when transporting the secondary battery 10, and may be understood as a configuration that grips the secondary battery 10 more stably to improve the transport stability of the secondary battery 10.

[0053] The frame gripper 120 can grip any area of ​​the frame 12b of the secondary battery 10 as long as it corresponds to the frame 12b. However, in consideration of the connection relationship with the storage gripper 110, the frame 12b may be configured to pressurize the edge formed by the protruding electrode lead 13 from the frame 12b.

[0054] The frame gripper 120 can have any structure as long as it is capable of gripping the frame 12b.

[0055] For example, as shown in FIG. 3 or 4, the frame gripper 120 may include a pair of gripper units 121A and 121B that are arranged facing each other across the battery case 12 and whose spacing is adjustable.

[0056] Specifically, the pair of gripper units 121A, 121B are positioned on the upper and lower sides of the battery case 12, and are configured so that the distance between them can be adjusted based on the thickness direction of the battery case 12 (the direction aligned with the Z direction based on Figures 3 and 4), and can pressurize and grip the frame portion 12b.

[0057] In this case, the frame gripper 120 may further include friction pads 122 provided on the surfaces of the gripper units 121A and 121B facing the battery case 12. The friction pads 122 may include various materials, for example, rubber or silicone.

[0058] The friction pads 122 may serve to prevent the battery case 12 from slipping when the gripper units 121A and 121B press and grip the battery case 12.

[0059] Meanwhile, the transfer device 100 for a secondary battery according to the present invention may further include a connection part 130 connecting the receiving part gripper 110 and the frame part gripper 120, as shown in FIGS. 4 to 5d.

[0060] Specifically, the connecting portion 130 is a configuration that connects the storage portion gripper 110 and the frame portion gripper 120, and can be understood as a configuration that allows the storage portion gripper 110 and the frame portion gripper 120 to operate together when transporting the secondary battery 10, thereby allowing the storage portion gripper 110 and the frame portion gripper 120 to grip the battery case 12 simultaneously.

[0061] The connecting unit 130 may be detachably connected to the container gripper 110 and the frame gripper 120. To this end, the connecting unit 130 may be connected to the container gripper 110 and the frame gripper 120 by bolt connection.

[0062] At least one through-hole h may be formed on one side of the connecting portion 130. At least one through-hole h may be formed, and a plurality of through-holes h may be formed along the length direction of the connecting portion 130 (the direction parallel to the Y direction in FIG. 4).

[0063] In addition, the through-holes h may have various shapes, and may have an oval shape elongated along the thickness direction of the connecting part 130 (the direction parallel to the Z direction in FIG. 4).

[0064] A fixing part 150 to be fixedly coupled to the storage part gripper 110 may pass through the through-hole h. The fixing part 150 may be a bolt that passes through the through-hole h and has an end fixed to the storage part gripper 110, thereby fixing and coupling the connection part 130 to the storage part gripper 110. In this case, the storage part gripper 110 may also be formed with a groove or hole into which the fixing part 150 can be inserted.

[0065] Here, if the through-hole h has an oval shape elongated along the thickness direction of the connecting portion 130, the coupling position of the fixing portion 150 may also be adjusted based on the thickness direction of the connecting portion 130. Therefore, the height of the receiving portion gripper 110 relative to the connecting portion 130 may be adjusted depending on the coupling position of the fixing portion 150 with respect to the through-hole h. In this case, there is an advantage that the position of the receiving portion gripper 110 can be easily adjusted even if the thickness of the receiving portion 12a varies depending on the model type of the secondary battery 10.

[0066] Meanwhile, the transfer device 100 for a secondary battery according to the present invention may further include a position moving unit 140 connected to any one of the frame gripper 120 and the container gripper 110 and moving the positions of the frame gripper 120 and the container gripper 110.

[0067] The position moving unit 140 may include a body 141 and a pair of arms 142 connected to the body 141 and at least one of the frame gripper 120 and the storage unit gripper 110.

[0068] Here, the main body 141 may include a frame capable of supporting the pair of arms 142, a driving motor for moving the positions of the pair of arms 142, and the like.

[0069] The arm 142 is connected to the main body 141 and at least one of the frame gripper 120 and the storage gripper 110, and may have various configurations.

[0070] Specifically, the arm portion 142 has one end connected to the main body 141 and the other end connected to at least one of the frame gripper 120 and the storage portion gripper 110, and can move the positions of the frame gripper 120 and the storage portion gripper 110.

[0071] In this case, the pair of arms 142 may be rotatably mounted on the body 141 along an arc so that their positions can be changed. In this case, the positions of the front and rear surfaces of the secondary battery 10 can be changed.

[0072] Meanwhile, the process of transferring the secondary battery 10 by the transfer device 100 for a secondary battery according to the present invention will be described in more detail below with reference to FIG. 5a or 5b.

[0073] 5a is a diagram showing the state in which the storage gripper 110 and the frame gripper 120 of the transfer device for the secondary battery 10 grip the secondary battery 10. In this case, the storage gripper 110 and the frame gripper 120 can move forward in a direction approaching the secondary battery 10 (Y direction based on FIG. 5a), and the gripper units 111A and 111B of the storage gripper 110 and the gripper units 121A and 121B of the frame gripper 120 can pressurize and fix the storage portion 12a and the frame portion 12b, respectively. At this time, the electrolyte E contained in the storage portion 12a can move from the edge of the storage portion 12a toward the center as the gripper units 111A and 111B of the storage gripper 110 pressurize the storage portion 12a.

[0074] 5b is a diagram showing an upside-down state of the secondary battery 10 gripped by the container gripper 110 and the frame gripper 120. In this case, the arm 142 connected to at least one of the container gripper 110 and the frame gripper 120 may rotate in an arc from the body 141, causing the secondary battery 10 to be upside-down. At this time, the positions of the front and rear of the secondary battery 10 may be interchanged.

[0075] Here, when the secondary battery 10 is turned upside down, the electrolyte E flows violently inside the storage compartment 12a, but since the edge of the storage compartment 12a is pressed by the storage compartment gripper 110, the electrolyte E cannot reach the edge of the storage compartment 12a, thereby preventing the separator from breaking.

[0076] 5c is a diagram showing the flow of the electrolyte E immediately after the secondary battery 10 gripped by the housing gripper 110 and the frame gripper 120 is turned over. At this time, the electrolyte E is still fluid and can flow inside the housing 12a, but as in FIG. 5b, the edge of the housing 12a is pressed by the housing gripper 110, preventing the electrolyte E from reaching the edge of the housing 12a. Therefore, folding of the separator can be prevented even immediately after the secondary battery 10 is turned over.

[0077] FIG. 5d illustrates the state in which the electrolyte E does not flow after the secondary battery 10 gripped by the container gripper 110 and the frame gripper 120 is turned over. Since the electrolyte E does not flow any further, the separator may not bend any further. Therefore, the gripper units 111A and 111B of the container gripper 110 and the gripper units 121A and 121B of the frame gripper 120 can release the pressure on the container 12a and the frame 12b. At this time, a portion of the electrolyte E contained in the container 12a can move toward the edge of the container 12a again due to the release of the pressure from the gripper units 111A and 111B of the container gripper 110. Then, the container gripper 110 and the frame gripper 120 can move backward (in the opposite direction to the Y direction in FIG. 5d) away from the secondary battery.

[0078] Example 2 The second embodiment of the present invention differs in that the shapes of some of the gripper units 111A, 111B of the storage section gripper 110 and the gripper units 121A, 121B of the frame section gripper 120 are different from the shapes of some of the gripper units 111A, 111B of the storage section gripper 110 and the gripper units 121A, 121B of the frame section gripper 120 in the first embodiment.

[0079] The content common to Example 1 will be omitted as much as possible, and differences will be mainly described for Example 2. In other words, if content not described in Example 2 is necessary, it is obvious that it can be regarded as the content of Example 1.

[0080] First, Fig. 6 shows the gripper unit 111A of the storage gripper 110. Here, the end of the gripper unit 111A, which faces the battery case 12, may be formed so that the surface thereof is inclined away from the battery case 12 as it approaches the end. That is, the surface of the end of the gripper unit 111A facing the battery case 12 may be formed with an inclined surface R1 that is inclined away from the battery case 12 as it approaches the end. Here, Fig. 6 shows only one gripper unit 111A of the pair of gripper units 111A and 111B facing the battery case 12, but it goes without saying that the other gripper unit 111B may also be formed with the inclined surface.

[0081] In this case, even if at least one of the storage unit gripper 110 and the secondary battery 10 is partially misaligned from its preset position, the storage unit gripper 110 can guide and move the position of the secondary battery 10 while moving forward toward the battery case 12, thereby minimizing damage that may occur to the storage unit 12a due to interference between the storage unit gripper 110 and the storage unit 12a.

[0082] Similarly, as shown in FIG. 7, the end of the gripper unit 121A of the frame gripper 120 may be formed so that the surface facing the battery case 12 is inclined toward the opposite direction of the battery case 12 as it approaches the end.

[0083] That is, an inclined surface R2 may be formed on the surface of the end of the gripper unit 121A facing the battery case 12, the surface being inclined in the opposite direction of the battery case 12 as it approaches the end. Although only one gripper unit 121A of the pair of gripper units 121A and 121B facing the battery case 12 is shown in FIG. 7, it goes without saying that the other gripper unit 121B may also have the inclined surface.

[0084] In this case, even if at least one of the frame gripper 120 and the secondary battery 10 is partially misaligned from its preset position, the frame gripper 120 can move forward toward the battery case 12 to guide and move the position of the secondary battery 10, thereby minimizing damage that may occur to the frame 12b due to interference between the frame gripper 120 and the frame 12b.

[0085] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations within the technical spirit of the present invention and the scope of the claims set forth below can be made by a person having ordinary skill in the art to which the present invention pertains. [Explanation of symbols]

[0086] 10 Secondary battery 11 Electrode assembly 12 Battery case 12a Storage area 12b Frame 13 Electrode Lead 100 Transfer device for secondary batteries 110 Storage unit gripper 111A Gripper Unit 111B Gripper unit 112 Buffer pad 120 Frame gripper 121A Gripper Unit 121B Gripper Unit 122 Friction Pad 130 Connection section 140 Position movement part 141 Main Unit 142 Arm section 150 Fixed part E Electrolyte R1 Inclined surface of the gripper unit that includes the storage gripper R2 Inclined surface of the gripper unit included in the frame gripper h Through hole

Claims

1. A secondary battery transfer device including: an electrode assembly in which electrodes and separators are alternately stacked; and a battery case that accommodates the electrode assembly, a pair of storage portion grippers that grip a storage portion in the battery case in which the electrode assembly is stored; and a pair of frame grippers for gripping a frame portion of the battery case extending from a frame of the storage portion;

2. The transfer device for a secondary battery according to claim 1 , wherein the storage unit gripper is configured to grip an edge of the storage unit.

3. The secondary battery further includes an electrode lead protruding from at least one end of the battery case; The transfer device for a secondary battery according to claim 1 , wherein the receiving portion gripper is configured to grip an edge of the receiving portion adjacent to the electrode lead.

4. The frame gripper is The transfer device for a secondary battery according to claim 1 , comprising a pair of gripper units disposed opposite each other across the battery case, the distance between which is adjustable.

5. The transfer device for a secondary battery according to claim 4 , wherein an end of the gripper unit is formed so that a surface facing the battery case is inclined toward a direction away from the battery case as it approaches an end.

6. The frame gripper is The transfer device for a secondary battery according to claim 4 , further comprising a friction pad provided on a surface of the gripper unit facing the battery case.

7. The transfer device for a secondary battery according to claim 6 , wherein the friction pad is made of a material including rubber.

8. The storage unit gripper The transfer device for a secondary battery according to claim 1 , comprising a pair of gripper units disposed opposite each other across the battery case, the distance between which is adjustable.

9. 9. The transfer device for a secondary battery according to claim 8, wherein an end of the gripper unit is formed so that a surface facing the battery case is inclined toward a direction away from the battery case as it approaches an end.

10. The storage unit gripper The transfer device for a secondary battery according to claim 8 , further comprising a buffer pad provided on a surface of the gripper unit facing the battery case.

11. 11. The transfer device for a secondary battery of claim 10, wherein the material of the buffer pad includes EVA (Ethylene-Vinyl Acetate).

12. The transfer device for a secondary battery according to claim 1 , further comprising at least one connecting portion connecting the container gripper and the frame gripper.

13. The transfer device for a secondary battery according to claim 12 , wherein the container gripper, the frame gripper, and the connecting portion are detachably coupled to each other.

14. The connecting portion has at least one through-hole formed on one side thereof; The transfer device for a secondary battery according to claim 12 , further comprising a fixing part that passes through the through-hole and is fixedly coupled to the receiving part gripper.

15. The through hole has an elliptical shape that is elongated along the thickness direction of the connecting portion; The transfer device for a secondary battery according to claim 14 , wherein the height of the receiving unit gripper relative to the connecting part is adjusted according to the coupling position of the fixing part relative to the through-hole.

16. The transfer device for a secondary battery according to claim 1 , further comprising a position moving unit connected to one of the frame gripper and the receiving unit gripper, and moving the positions of the frame gripper and the receiving unit gripper.

17. The position moving unit Body; and the body and a pair of arms connected to at least one of the frame gripper and the storage gripper; The secondary battery transport device according to claim 16 , wherein the pair of arms are rotatably mounted on the main body in an arc so that their positions can be changed.

Images