Transfer device for secondary battery

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, filed on July 22, 2022, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference in their entirety.

[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 a separator are alternately laminated and a battery case for accommodating the electrode assembly.

Background Art

[0003] Unlike primary batteries, secondary batteries are rechargeable and have been actively researched and developed recently due to their potential for miniaturization and high capacity. With the development of technologies for mobile devices and the increasing demand, the demand for secondary batteries as an energy source has been rapidly increasing.

[0004] Secondary batteries are classified into coin - type batteries, cylindrical batteries, prismatic batteries, and pouch - type batteries according to the shape of the battery case. An electrode assembly installed inside the battery case in a secondary battery is a power - generating element capable of charge and discharge having a laminated structure of electrodes and a separator.

[0005] Electrode assemblies can be generally classified into a jelly - roll type in which a separator is interposed between sheet - shaped positive and negative electrodes coated with an active material and wound, a stack type in which a number of positive and negative electrodes are sequentially laminated with a separator interposed therebetween, and a stack / folding type in which unit cells of the stack type are wound with a long separation film.

[0006] Recently, pouch - type secondary batteries having a structure in which a stack - type or stack / folding - type electrode assembly is built into an aluminum laminate sheet battery case have attracted much attention due to their low manufacturing cost, small weight, and easy form deformation, and their usage is gradually increasing.

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

[0008] On the other hand, in such a manufacturing process of a secondary battery, the transfer of the secondary battery is necessarily involved. However, defective phenomena such as folding of the separator may occur during the transfer of the secondary battery. That is, during the process of transferring the secondary battery with the electrode assembly and the electrolytic solution built in the battery case, a phenomenon may occur in which the electrolytic solution biases to one side. Due to such a bias of the electrolytic solution, a part of the separator of the electrode assembly, particularly a part of the outermost separator on the electrode tab side, may be folded. In this case, problems that affect the quality of the secondary battery may occur, so there is a need to develop a technology to solve such problems.

Summary of the Invention

Problems 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 defective phenomena such as folding of the separator in the manufacturing process of the secondary battery.

Means for Solving the Problems

[0010] The present invention provides a transfer device for a secondary battery, including: an electrode assembly in which electrodes and separators are alternately laminated; a pair of storage part grippers that grip a storage part in which the electrode assembly is stored in the battery case; and a pair of frame part grippers that grip a frame part extended from a frame of the storage part in the battery case.

[0011] The storage part gripper may be provided to grip an edge of the storage part.

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

[0013] The frame part gripper may include a pair of gripper units provided to face each other with the battery case interposed therebetween and the distance between them being adjustable.

[0014] An end of the gripper unit may be formed to be inclined in a direction opposite to the battery case as a surface facing the battery case goes toward the end.

[0015] The frame part 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 part gripper may include a pair of gripper units provided to face each other with the battery case interposed therebetween and the distance between them being adjustable.

[0018] An end of the gripper unit may be formed to be inclined in a direction opposite to the battery case as a surface facing the battery case goes toward the end.

[0019] The storage part 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] It may further include at least one connecting part connecting the storage part gripper and the frame part gripper.

[0022] The storage part gripper, the frame part gripper, and the connecting part may be detachably coupled to each other.

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

[0024] The through hole has an elliptical shape that is long along the thickness direction of the connecting part; and the height of the storage part gripper from the connecting part may be adjusted by the coupling position of the fixing part with respect to the through hole.

[0025] On the other hand, the transfer device for a secondary battery according to the present invention may further include a position moving part that is connected to any one of the frame part gripper and the storage part gripper and moves the positions of the frame part gripper and the storage part gripper.

[0026] The position moving part includes a main body; and a pair of arm parts that are connected to at least any one of the main body and the frame part gripper and the storage part gripper; and the pair of arm parts may be rotatably provided so as to draw an arc from the main body so that their positions with respect to each other are changed.

Advantages of the Invention

[0027] The present invention includes a pair of storage part grippers that grip a storage part in which the electrode assembly is stored in the battery case, and thus, when transferring the secondary battery, it is possible to prevent the separation membrane of the electrode assembly from being folded due to the flow of the electrolyte.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5a

Figure 5b

Figure 5c

Figure 5d

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0029] Hereinafter, with reference to the drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention may be realized in various different forms and is not limited or restricted by the following embodiments.

[0030] To clearly explain the present invention, detailed explanations of parts not related to the explanation or related known technologies that may unnecessarily obscure the gist of the present invention are omitted, and when attaching reference numerals to the components of each figure in this specification, the same or similar reference numerals are attached to the same or similar components throughout the specification.

[0031] Moreover, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary or dictionary meanings. In accordance with the principle that the inventor can appropriately define the concept of the terms in order to explain his or her invention in the best way, they should be construed in a meaning and concept consistent with the technical idea of the present invention.

[0032] Example 1 The present invention provides a transfer device 100 for a secondary battery, which includes a pair of storage part grippers 110 that grip a storage part 12a in a battery case 12 where an electrode assembly 11 is stored, and a pair of frame part grippers 120 that grip a frame part 12b extending from a frame of the storage part 12a, in a manufacturing apparatus for the secondary battery 10 including the electrode assembly 11 in which electrodes and a separator are alternately laminated and the battery case 12 that houses the electrode assembly 11.

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

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

[0035] And the battery case 12 that houses the electrode assembly 11 may include a storage part 12a in which the electrode assembly 11 is stored and a frame part 12b extending from a frame of the storage part 12a.

[0036] Specifically, the storage portion 12a may be understood as an area where a space is formed by forming a part of the battery case 12 in a concave shape. The electrode assembly 11 may be stored in the formed space, and the electrolytic solution E may be injected therein.

[0037] Further, the frame portion 12b may be configured to extend from the frame of the storage portion 12a and may have a structure with sealed edges. Such a sealing structure may be for preventing the electrode assembly 11 stored inside the battery case 12 from being damaged by being exposed to external moisture, air, etc., and may be for preventing the electrolytic 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 having 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 electrical device outside the battery case 12 or another secondary battery 10.

[0039] On the other hand, in such a secondary battery 10, in order to prevent lithium deposition, the area of the negative electrode must be wide enough to cover the positive electrode. For this reason, in the process of adhering the positive electrode / separator / negative electrode, the edge portion of the separator where only the negative electrode exists may be easily folded when the electrolytic solution E flows. In particular, such a folding phenomenon can easily occur in the outermost separator at the edge of the electrode lead 13 or the electrode tab side.

[0040] Also, in the secondary battery 10, the front / rear surfaces of the secondary battery 10 may be inverted and moved relative to each other during the transfer process. At this time, when the secondary battery 10 is rotated due to the inversion of the front / rear surfaces of the secondary battery 10, the phenomenon of uneven distribution of the electrolytic solution E may be aggravated. Therefore, although the rotation speed of rotating the secondary battery 10 can be slowed down to alleviate the degree of flow of the electrolytic solution E, this may reduce the production volume or cause different problems.

[0041] In order to solve the above problems, as shown in FIG. 2, the present invention can provide a transfer device 100 for a secondary battery including a storage part gripper 110 and a frame part gripper 120 so as to prevent the folding phenomenon of the separator of the electrode assembly 11 while ensuring the production volume during the transfer of the secondary battery 10. Hereinafter, the storage part gripper 110 and the frame part gripper 120 will be described in more detail.

[0042] First, the storage part gripper 110 is configured to grip a storage part 12a in which the electrode assembly 11 is stored in the battery case 12, and various configurations are possible.

[0043] Specifically, the storage part gripper 110 is configured to grip the secondary battery 10 simultaneously with the frame part gripper 120 during the transfer of the secondary battery 10, and may be understood as a configuration that serves as a kind of dam to prevent the flow of the electrolyte E injected into the storage part 12a of the battery case 12.

[0044] At this time, the storage part gripper 110 can grip the storage part 12a in any region as long as it is a region corresponding to the storage part 12a. However, the storage part gripper 110 may preferably be provided so as to press the edge of the storage part 12a where the folding of the separator is likely to occur.

[0045] Among the edges of the storage part 12a at this time, the edge of the storage part 12a formed adjacent to the electrode tab and / or the electrode lead 13 is a region that greatly affects the quality of the secondary battery 10 when the folding of the separator occurs, and the storage part gripper 110 may more preferably be provided so as to press the edge of the storage part 12a formed adjacent to the electrode lead 13 or the electrode tab.

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

[0047] For example, as shown in FIG. 3 or FIG. 4, the storage unit gripper 110 can include a pair of gripper units 111A and 111B that are provided facing each other with the battery case 12 therebetween and whose distance therebetween is adjustable.

[0048] Specifically, the pair of gripper units 111A and 111B are located above and below the battery case 12, and are provided so that the distance therebetween can be adjusted based on the thickness direction of the battery case 12 (the direction parallel to the Z direction with reference to FIGS. 3 and 4), and can press and grip the storage unit 12a.

[0049] At this time, the storage unit gripper 110 can further include a buffer pad 112 provided on the surfaces of the gripper units 111A and 111B facing the battery case 12. The buffer pad 112 can include various materials, for example, it can include EVA (Ethylene-Vinyl Acetate).

[0050] Such a buffer pad 112 can play a role in preventing damage to the surface of the storage unit 12a when the gripper units 111A and 111B press the storage unit 12a.

[0051] On the other hand, the frame unit gripper 120 is configured to grip a frame portion 12b extending from the frame of the storage unit 12a in the battery case 12, and various configurations are possible.

[0052] Specifically, the frame unit gripper 120 is configured to grip the secondary battery 10 together with the above-described storage unit gripper 110 during the transfer of the secondary battery 10, and can be understood as a configuration that more stably grips the secondary battery 10 and improves the transfer stability of the secondary battery 10.

[0053] Such a frame gripper 120 can grip the frame portion 12b in any region as long as it corresponds to the frame portion 12b of the secondary battery 10. However, the frame portion 12b may be provided so as to press the edge where the electrode lead 13 protrudes in the frame portion 12b in consideration of the connection relationship with the storage gripper 110 described above.

[0054] The frame gripper 120 can have any structure as long as it can grip the frame portion 12b.

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

[0056] Specifically, the pair of gripper units 121A and 121B are located above and below the battery case 12, and are provided so that their distance from each other can be adjusted with respect to the thickness direction of the battery case 12 (the direction parallel to the Z direction with reference to FIGS. 3 and 4), and can grip the frame portion 12b by pressing it.

[0057] At this time, the frame gripper 120 can further include a friction pad 122 provided on the surfaces of the gripper units 121A and 121B facing the battery case 12. The friction pad 122 can include various materials, for example, it can include rubber or silicon.

[0058] Such a friction pad 122 can play a role in preventing slipping from the battery case 12 when the gripper units 121A and 121B press and grip the battery case 12.

[0059] On the other hand, as shown in FIGS. 4 to 5d, the transfer device 100 for a secondary battery according to the present invention can further include a connecting portion 130 that connects the storage gripper 110 and the frame gripper 120.

[0060] Specifically, the connecting portion 130 is configured to connect the storage portion gripper 110 and the frame portion gripper 120, and when the secondary battery 10 is transferred, the storage portion gripper 110 and the frame portion gripper 120 can operate integrally, so that the storage portion gripper 110 and the frame portion gripper 120 grip the battery case 12 simultaneously.

[0061] Such a connecting portion 130 may be detachably coupled to the storage portion gripper 110 and the frame portion gripper 120. For this purpose, the connecting portion 130 may be bolted to the storage portion gripper 110 and the frame portion gripper 120.

[0062] And at least one through hole h may be formed on one side surface of the connecting portion 130. At this time, the through hole h may be formed in at least one or more, and may be formed in a plurality along the length direction of the connecting portion 130 (the direction parallel to the Y direction with reference to FIG. 4).

[0063] Also, the through hole h can have various shapes. At this time, the through hole h can also have an elliptical shape formed long along the thickness direction of the connecting portion 130 (the direction parallel to the Z direction with reference to FIG. 4).

[0064] A fixing portion 150 fixedly coupled to the storage portion gripper 110 may penetrate through the through hole h. Here, the fixing portion 150 may be a bolt, penetrate through the through hole h, and at this time, the end is fixed to the storage portion gripper 110, so that the connecting portion 130 and the storage portion gripper 110 can be fixedly coupled. In this case, a groove or hole into which the fixing portion 150 can be inserted may also be formed in the storage portion gripper 110.

[0065] Here, when the through hole h has an elliptical shape that is long 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 storage part gripper 110 from the connecting portion 130 may be adjusted according to the coupling position of the fixing portion 150 with respect to the through hole h. In this case, even when the thickness of the storage part 12a or the like changes depending on the type of the secondary battery 10 model, there is an advantage that the position of the storage part gripper 110 can be easily adjusted.

[0066] On the other hand, the transfer device 100 for a secondary battery according to the present invention may further include a position moving part 140 that is connected to any one of the frame part gripper 120 and the storage part gripper 110 and moves the positions of the frame part gripper 120 and the storage part gripper 110.

[0067] The position moving part 140 may include a main body 141 and a pair of arm parts 142 that are connected to at least one of the main body 141 and the frame part gripper 120 and the storage part gripper 110.

[0068] Here, the main body 141 may include a frame that can support the pair of arm parts 142, a drive motor for moving the positions of the pair of arm parts 142, and the like.

[0069] The arm part 142 is configured to be connected to at least one of the main body 141 and the frame part gripper 120 and the storage part gripper 110, and various configurations are possible.

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

[0071] At this time, the pair of arm portions 142 may be provided so as to be rotatable about an arc from the main body 141 so that their positions relative to each other are changed. In this case, the positions of the front and rear surfaces of the secondary battery 10 can be changed relative to each other.

[0072] On the other hand, the process by which the secondary battery transfer device 100 according to the present invention described above transfers the secondary battery 10 will be described in more detail below with reference to FIGS. 5A or 5B.

[0073] First, FIG. 5A is a diagram showing a state in which the storage unit gripper 110 and the frame unit gripper 120 of the secondary battery transfer device grip the secondary battery 10. In this case, the storage unit gripper 110 and the frame unit gripper 120 can move forward (in the Y direction with reference to FIG. 5A) in a direction approaching the secondary battery 10, and the gripper units 111A and 111B of the storage unit gripper 110 and the gripper units 121A and 121B of the frame unit gripper 120 can press and fix the storage unit 12a and the frame unit 12b, respectively. At this time, the electrolytic solution E built in the storage unit 12a can move from the edge of the storage unit 12a toward the central portion when the gripper units 111A and 111B of the storage unit gripper 110 press the storage unit 12a.

[0074] And FIG. 5B is a diagram showing a state in which the secondary battery 10 gripped by the storage unit gripper 110 and the frame unit gripper 120 is turned over. In this case, the secondary battery 10 may be turned over when the arm portion 142 connected to at least one of the storage unit gripper 110 and the frame unit gripper 120 is rotated about an arc from the main body 141. At this time, the positions of the front and rear surfaces of the secondary battery 10 can be changed relative to each other.

[0075] Here, although the electrolytic solution E flows violently inside the storage unit 12a when the secondary battery 10 is turned over, since the edge of the storage unit 12a is in a state of being pressed by the storage unit gripper 110, the electrolytic solution E cannot reach the edge of the storage unit 12a, thereby preventing the separator from being folded.

[0076] Figure 5c is a diagram showing the flow of the electrolytic solution E immediately after the secondary battery 10 gripped by the storage part gripper 110 and the frame part gripper 120 is turned over. At this time, since the electrolytic solution E still has fluidity, it can flow inside the storage part 12a. However, similar to FIG. 5b, since the edge of the storage part 12a is in a state of being pressurized by the storage part gripper 110, the electrolytic solution E cannot reach the edge of the storage part 12a. Therefore, even immediately after the secondary battery 10 is turned over, the folding of the separator can be prevented.

[0077] Figure 5d is a diagram showing a state where the electrolytic solution E does not flow after the secondary battery 10 gripped by the storage part gripper 110 and the frame part gripper 120 is turned over. At this time, since the electrolytic solution E does not flow any more, the folding of the separator may not occur any more. Therefore, the gripper units 111A and 111B of the storage part gripper 110 and the gripper units 121A and 121B of the frame part gripper 120 can release the pressure on the storage part 12a and the frame part 12b. At this time, a part of the electrolytic solution E in the storage part 12a can move again toward the edge of the storage part 12a when the pressure of the gripper units 111A and 111B of the storage part gripper 110 is released. Then, the storage part gripper 110 and the frame part gripper 120 can move backward in a direction away from the secondary battery (the opposite direction of the Y direction with reference to FIG. 5d).

[0078] Example 2 In Example 2 of the present invention, there is a difference in that a part of the shape of the gripper units 111A and 111B of the storage part gripper 110 and the gripper units 121A and 121B of the frame part gripper 120 is different from a part of the shape of the gripper units 111A and 111B of the storage part gripper 110 and the gripper units 121A and 121B according to Example 1.

[0079] The content common to Example 1 will be omitted as much as possible, and Example 2 will be described centering on the differences. That is, it is obvious that when the content not described in Example 2 is necessary, it can be regarded as the content of Example 1.

[0080] First, FIG. 6 shows the gripper unit 111A of the storage unit gripper 110. Here, the end of the gripper unit 111A may be formed to be inclined in the opposite direction of the battery case 12 as the surface facing the battery case 12 approaches the end. That is, an inclined surface R1 may be formed on the surface of the end of the gripper unit 111A facing the battery case 12, which is inclined in the opposite direction of the battery case 12 as it approaches the end. Here, only one gripper unit 111A out of the pair of gripper units 111A and 111B facing the battery case 12 is shown in FIG. 6, but it goes without saying that the other gripper unit 111B may also have the inclined surface formed.

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

[0082] Similarly, as shown in FIG. 7, the end of the gripper unit 121A of the frame unit gripper 120 may be formed to be inclined in the opposite direction of the battery case 12 as the surface facing the battery case 12 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, which is inclined in the opposite direction of the battery case 12 as it approaches the end. Here, only one gripper unit 121A out of the pair of gripper units 121A and 121B facing the battery case 12 is shown in FIG. 7, but it goes without saying that the other gripper unit 121B may also have the inclined surface formed.

[0084] In this case, even if at least one of the frame gripper 120 and the secondary battery 10 is partially misaligned from a preset position, the frame gripper 120 can guide and move the position of the secondary battery 10 while moving forward toward the battery case 12. Therefore, it is possible to minimize damage that may occur to the frame portion 12b due to interference between the frame gripper 120 and the frame portion 12b.

[0085] As described above, even if the present invention is described by way of limited embodiments and drawings, the present invention is not limited thereby, and various implementations are possible within the equivalent scope of the technical idea of the present invention and the claims described below by those having ordinary knowledge in the technical field to which the present invention pertains.

Explanation of Reference Numerals

[0086] 10 Secondary battery 11 Electrode assembly 12 Battery case 12a Storage portion 12b Frame portion 13 Electrode lead 100 Transfer device for secondary battery 110 Storage gripper 111A Gripper unit 111B Gripper unit 112 Buffer pad 120 Frame gripper 121A Gripper unit 121B Gripper unit 122 Friction pad 130 Connecting portion 140 Position moving portion 141 Main body 142 Arm portion 150 Fixing portion E Electrolyte R1 Inclined surface of the gripper unit included in the storage gripper R2 Inclined surface of the gripper unit included in the frame gripper h Through hole

Claims

1. 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, a pair of storage part grippers for gripping a storage part in the battery case where the electrode assembly is stored; and a transfer device for a secondary battery including a pair of frame part grippers for gripping a frame part extending from a frame of the storage part in the battery case.

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

3. The secondary battery further includes an electrode lead formed to protrude from at least one end of the battery case; The transfer device for a secondary battery according to claim 1, wherein the storage part gripper is provided to grip an edge of the storage part adjacent to the electrode lead.

4. The frame part gripper includes a pair of gripper units provided to face each other with the battery case therebetween and the distance between them being adjustable, the transfer device for a secondary battery according to claim 1.

5. The transfer device for a secondary battery according to claim 4, wherein an end of the gripper unit is formed to be inclined in a direction opposite to the battery case as a surface facing the battery case goes toward the end.

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

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

8. The storage part gripper includes a pair of gripper units provided to face each other with the battery case therebetween and the distance between them being adjustable, the transfer device for a secondary battery according to claim 1.

9. The transfer device for a secondary battery according to claim 8, wherein an end of the gripper unit is formed to be inclined in a direction opposite to the battery case as a surface facing the battery case goes toward the end.

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

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

12. The secondary battery transfer device according to claim 1, further comprising at least one connecting part that connects the storage part gripper and the frame part gripper.

13. The secondary battery transfer device according to claim 12, wherein the storage part gripper, the frame part gripper, and the connecting part are detachably coupled to each other.

14. At least one through hole is formed in one side surface of the connecting part; The secondary battery transfer device according to claim 12, further comprising a fixing part that penetrates the through hole and is fixedly coupled to the storage part gripper.

15. The through hole has an elliptical shape that is long along the thickness direction of the connecting part; The secondary battery transfer device according to claim 14, wherein the height of the storage part gripper with respect to the connecting part is adjusted along the coupling position of the fixing part with respect to the through hole.

16. The secondary battery transfer device according to claim 1, further comprising a position moving part that is connected to any one of the frame part gripper and the storage part gripper and moves the positions of the frame part gripper and the storage part gripper.

17. The position moving part includes a main body; and a pair of arm parts that are connected to at least one of the main body and the frame part gripper and the storage part gripper; The secondary battery transfer device according to claim 16, wherein the pair of arm parts are rotatably provided so as to draw an arc from the main body so that their positions are changed relative to each other.

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