Transfer device for secondary batteries

Abstract

The present invention relates to a transfer device for a secondary battery, and more specifically, to a transfer device for a secondary battery comprising an electrode assembly in which electrodes and separators are alternately stacked, and a battery case that accommodates the electrode assembly. The present invention provides a secondary battery transfer device comprising: an electrode assembly in which electrodes and separators are alternately stacked; a battery case that accommodates the electrode assembly; a pair of storage grippers that grip a storage portion in which the electrode assembly is stored in the battery case; and a pair of edge grippers that grip an edge portion extending from the edge of the storage portion in the battery case.

Description

Technology Field

[0001] The present invention relates to a transfer device for a secondary battery, and more specifically, to a transfer device for a secondary battery comprising an electrode assembly in which electrodes and separators are alternately stacked, and a battery case that accommodates the electrode assembly. Background Technology

[0002] Unlike primary batteries, secondary batteries are rechargeable and are currently the subject of extensive research and development due to their potential for miniaturization and high capacity. As technological development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rising rapidly.

[0003] Secondary batteries are classified into coin-type, cylindrical, prismatic, and pouch-type batteries according to the shape of the battery case. In secondary batteries, the electrode assembly mounted inside the battery case is a power generation device capable of charging and discharging, consisting of a laminated structure of electrodes and separators.

[0004] Electrode assemblies can be roughly classified into a jelly roll type, which is wound with a separator interposed between sheet-type positive and negative electrodes coated with active material; a stack type, which is sequentially stacked with multiple positive and negative electrodes interposed with a separator; and a stack / folding type, which is wound with stack-type unit cells into a long separating film.

[0005] Recently, pouch-type rechargeable batteries with a structure in which a stacked or stacked / folded electrode assembly is embedded in a battery case made of aluminum laminate sheets are attracting a lot of attention due to reasons such as low manufacturing costs, small weight, and easy shape deformation, and their usage is gradually increasing.

[0006] Such a pouch-type secondary battery is manufactured through secondary battery manufacturing processes such as an assembly process in which an electrode assembly is housed together with an electrolyte inside a battery case; a sealing process in which the battery case is sealed; and an activation process in which the electrode assembly is activated.

[0007] Meanwhile, the transport of secondary batteries is an essential part of such secondary battery manufacturing processes. However, defects such as separator folding may occur during the transport of secondary batteries. Specifically, when transporting secondary batteries with the electrode assembly and electrolyte contained in a battery case, the electrolyte may shift to one side. Due to this shifting of the electrolyte, a portion of the separator of the electrode assembly, particularly the outermost separator near the electrode tab, may fold. Since this can adversely affect the quality of the secondary battery, there is a need for technological development to resolve this issue. The problem to be solved

[0008] The present invention has been devised to solve the above-mentioned problems, and the objective of the present invention is to provide a transfer device for a secondary battery that can prevent defects such as separator folding in the secondary battery manufacturing process.

[0009] It is to provide. means of solving the problem

[0010] The present invention provides a secondary battery transfer device comprising: an electrode assembly in which electrodes and separators are alternately stacked; a battery case that accommodates the electrode assembly; a pair of storage grippers that grip a storage portion in which the electrode assembly is stored in the battery case; and a pair of edge grippers that grip an edge portion extending from the edge of the storage portion in the battery case.

[0011] The above storage portion gripper may be provided to grip the edge of the storage portion.

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

[0013] The above-mentioned edge gripper may include a pair of gripper units arranged to face each other with the battery case in between and having an adjustable spacing between them.

[0014] The end of the gripper unit may be formed such that the surface facing the battery case slopes toward the opposite direction of the battery case as it approaches the end.

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

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

[0017] The above storage unit gripper may include a pair of gripper units arranged to face each other with the battery case in between and having an adjustable spacing between them.

[0018] The end of the gripper unit may be formed such that the surface facing the battery case slopes toward the opposite direction of the battery case as it approaches the end.

[0019] The above storage unit gripper may further include a cushioning pad provided on the surface facing the battery case in the gripper unit.

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

[0021] It may further include at least one connecting part connecting the above storage part gripper and the above edge part gripper.

[0022] The above storage portion gripper, the above edge portion gripper, and the above connecting portion can be mutually detachably coupled.

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

[0024] The through hole has an elliptical shape formed lengthwise along the thickness direction of the connecting part; and the height of the storage part gripper can be adjusted with respect to the connecting part according to the coupling position of the fixing part with respect to the through hole.

[0025] Meanwhile, the transfer device for a secondary battery according to the present invention may further include a position moving part connected to either the edge gripper or the storage part gripper to move the position of the edge gripper and the storage part gripper.

[0026] The above position moving member includes a main body; and a pair of arm members connected to at least one of the main body, the edge gripper, and the storage gripper; and the pair of arm members may be arranged to rotate in an arc from the main body so as to change their positions relative to each other. Effects of the invention

[0027] The present invention includes a pair of storage grippers that grip a storage portion in which the electrode assembly is stored in the battery case, thereby having the effect of preventing the separator of the electrode assembly from folding due to electrolyte flow during the transfer of the secondary battery. Brief explanation of the drawing

[0028] Figure 1 is a front view of a secondary battery. FIG. 2 is a plan view showing a transfer device for a secondary battery according to Example 1 of the present invention. FIG. 3 is a side view showing in detail the storage portion gripper, the edge portion gripper, the connecting portion, and the arm portion of the secondary battery transfer device of FIG. 2. FIG. 4 is a rear view showing in detail the storage portion gripper, the edge portion gripper, the connecting portion, and the arm portion of the secondary battery transfer device of FIG. 2. FIGS. 5a to 5d are conceptual diagrams sequentially showing the secondary battery transfer device of FIG. 2 transferring the secondary battery. FIG. 6 is a side view showing in more detail the gripper unit of the storage unit gripper in a transfer device for a secondary battery according to Embodiment 2 of the present invention. FIG. 7 is a side view showing the edge gripper unit in more detail in a transfer device for a secondary battery according to Embodiment 2 of the present invention. Specific details for implementing the invention

[0029] Hereinafter, preferred embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0030] In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification.

[0031] Furthermore, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0032] Example 1

[0033] The present invention provides a secondary battery transfer device (100) comprising: an electrode assembly (11) having electrodes and separators alternately stacked; a battery case (12) accommodating the electrode assembly (11); 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 edge grippers (120) for gripping an edge portion (12b) extending from the edge of the storage portion (12a) in the battery case (12).

[0034] First, the secondary battery (10) may include an electrode assembly (11) in which electrodes and separators are alternately stacked, as shown in FIG. 1; and a battery case (12) that accommodates the electrode assembly (11).

[0035] Here, the electrode assembly (11) is configured such that the electrode and the separator are stacked, and can have various structures. For example, the electrode assembly (11) may be stacked in the order of a positive current collector, a positive active material layer, a separator, a negative active material layer, and a negative current collector, and may have a structure in which the positive active material layer on one side of the separator faces the negative 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 the electrode lead (13) described later. Note 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.

[0036] And the battery case (12) in which the electrode assembly (11) is received may include a storage portion (12a) in which the electrode assembly (11) is received and a rim portion (12b) extending from the rim of the storage portion (12a).

[0037] Specifically, the storage portion (12a) can be understood as an area where a portion of the battery case (12) is formed concavely to create an empty space. The electrode assembly (11) can be stored in the empty space, and an electrolyte (E) can be injected.

[0038] And the above-mentioned rim portion (12b) is a structure extending from the rim of the above-mentioned storage portion (12a) and may have a structure with a sealed edge. This sealed structure may be intended to prevent the electrode assembly (11) stored inside the battery case (12) from being damaged by exposure to external moisture and air, and may be intended to prevent the electrolyte (E) injected inside the battery case (12) from leaking out.

[0039] An electrode lead (13) may protrude from at least one end of the battery case (12) described above. Here, the electrode lead (13) can be understood as having one end connected to an electrode assembly (11) inside the battery case (12) and the other end electrically connected to an electrical device or another secondary battery (10) outside the battery case (12).

[0040] Meanwhile, in order to prevent lithium precipitation, the negative electrode area of ​​the secondary battery (10) described above must be large enough to cover the positive electrode. Because of this, during the bonding process of the positive electrode / separator / negative electrode, the edge portion of the separator where only the negative electrode exists can easily fold when the electrolyte (E) flows. In particular, such folding can easily occur at the outermost separator located at the edge of the electrode lead (13) or electrode tab.

[0041] Additionally, the secondary battery (10) may be moved with its front and rear sides reversed during the transfer process. When the secondary battery (10) is rotated to reverse its front and rear sides, the phenomenon of electrolyte (E) shifting may be exacerbated. Although the degree of electrolyte (E) flow may be mitigated by slowing down the rotation speed of the secondary battery (10), this may cause another problem that reduces production volume.

[0042] In order to solve the above-mentioned problem, the present invention may provide a secondary battery transfer device (100) comprising a storage part gripper (110) and a edge part gripper (120) so as to prevent the folding phenomenon of the separator of the electrode assembly (11) while securing production volume when transferring the secondary battery (10), as shown in FIG. 2. The storage part gripper (110) and the edge part gripper (120) will be described in more detail below.

[0043] First, the above-mentioned storage gripper (110) is configured to grip the storage portion (12a) in which the electrode assembly (11) is stored in the battery case (12), and various configurations are possible.

[0044] Specifically, the above-mentioned storage part gripper (110) is configured to grip the secondary battery (10) simultaneously with the above-mentioned edge part gripper (120) when transporting the secondary battery (10), and can be understood as a configuration that acts as a kind of dam to prevent the flow of the electrolyte (E) injected into the storage part (12a) of the battery case (12).

[0045] At this time, the storage unit gripper (110) can grip the storage unit (12a) in any area corresponding to the storage unit (12a). However, it may be preferable for the storage unit gripper (110) to be provided to press the edge of the storage unit (12a) where the separator folds easily occur.

[0046] At this time, the edge of the storage portion (12a) formed adjacent to the electrode tab and / or electrode lead (13) among the edges of the storage portion (12a) is an area that significantly affects the quality of the secondary battery (10) when separator folding occurs, and it may be more preferable for the storage portion gripper (110) to be provided to press the edge of the storage portion (12a) formed adjacent to the electrode lead (13) or electrode tab.

[0047] The above-described storage unit gripper (110) can have any structure that can grip the storage unit (12a).

[0048] For example, the above storage unit gripper (110) may include a pair of gripper units (111A, 111B) arranged to face each other with the battery case (12) in between and having a mutually adjustable spacing, as shown in FIGS. 3 and 4.

[0049] Specifically, the above pair of gripper units (111A, 111B) are positioned on the upper and lower sides of the battery case (12) and are arranged so that their spacing is adjusted relative to the thickness direction of the battery case (12) (a direction parallel to the Z direction in FIG. 3 and FIG. 4) so ​​as to be able to press and grip the storage portion (12a).

[0050] At this time, the storage unit gripper (110) may further include a cushioning pad (112) provided on the surface facing the battery case (12) in the gripper units (111A, 111B). The cushioning pad (112) may include various materials, for example, EVA (Ethylene-Vinyl Acetate).

[0051] These cushioning pads (112) can serve to prevent damage to the surface of the storage unit (12a) when the gripper units (111A, 111B) press the storage unit (12a).

[0052] Meanwhile, the edge gripper (120) is configured to grip the edge portion (12b) extending from the edge of the storage portion (12a) in the battery case (12), and various configurations are possible.

[0053] Specifically, the above-described edge gripper (120) is configured to grip the secondary battery (10) together with the above-described storage gripper (110) when transporting the secondary battery (10), and can be understood as a configuration that improves the transport stability of the secondary battery (10) by gripping the secondary battery (10) more stably.

[0054] Such a rim portion gripper (120) can grip any area corresponding to the rim portion (12b) of the secondary battery (10). However, considering the connection relationship with the storage portion gripper (110) described above, the rim portion (12b) may be configured to press the edge where the electrode lead (13) is formed protruding from the rim portion (12b).

[0055] The above-described edge gripper (120) can have any structure capable of gripping the edge portion (12b).

[0056] For example, the above-mentioned edge gripper (120) may include a pair of gripper units (121A, 121B) arranged to face each other with the battery case (12) in between and having a mutually adjustable spacing, as shown in FIGS. 3 and 4.

[0057] Specifically, the above pair of gripper units (121A, 121B) are positioned on the upper and lower sides of the battery case (12) and are arranged so that their spacing is adjusted relative to the thickness direction of the battery case (12) (a direction parallel to the Z direction in FIG. 3 and FIG. 4) so ​​as to be able to press and grip the edge portion (12b).

[0058] At this time, the edge gripper (120) may further include a friction pad (122) provided on the surface facing the battery case (12) in the gripper units (121A, 121B). The friction pad (122) may include various materials, for example, rubber or silicone.

[0059] These friction pads (122) can serve to prevent slipping from the battery case (12) when the gripper units (121A, 121B) press and grip the battery case (12).

[0060] Meanwhile, the transfer device (100) for a secondary battery according to the present invention may further include a connecting part (130) connecting the storage part gripper (110) and the edge part gripper (120), as shown in FIGS. 4 and 5.

[0061] Specifically, the connecting part (130) is configured to connect the storage part gripper (110) and the edge part gripper (120), and can be understood as a configuration that allows the storage part gripper (110) and the edge part gripper (120) to operate as a single unit when transporting the secondary battery (10), thereby enabling the storage part gripper (110) and the edge part gripper (120) to grip the battery case (12) simultaneously.

[0062] This connecting part (130) can be mutually detachably coupled with the storage part gripper (110) and the edge part gripper (120). To this end, the connecting part (130) can be mutually connected with the storage part gripper (110) and the edge part gripper (120) by bolt coupling.

[0063] And at least one through hole (h) may be formed on one side of the connecting part (130). At this time, the through hole (h) may be formed as at least one or more, and may be formed as a plurality along the length direction of the connecting part (130) (a direction parallel to the Y direction in Fig. 4).

[0064] In addition, the through hole (h) may have various shapes. In this case, the through hole (h) may have an elliptical shape formed long along the thickness direction of the connecting part (130) (a direction parallel to the Z direction in Fig. 4).

[0065] A fixing part (150) that is fixedly coupled to the storage part gripper (110) may pass through the above-mentioned through hole (h). Here, the fixing part (150) may be a bolt, and by passing through the through hole (h) and fixing its end to the storage part gripper (110), the connecting part (130) and the storage part gripper (110) can be fixedly coupled. In this case, the storage part gripper (110) may also have a groove or hole formed therein into which the fixing part (150) can be inserted.

[0066] Here, if the through hole (h) has an elliptical shape formed along the thickness direction of the connecting part (130), the coupling position of the fixing part (150) can also be adjusted based on the thickness direction of the connecting part (130). Accordingly, the height of the storage part gripper (110) relative to the connecting part (130) can be adjusted according to the coupling position of the fixing part (150) relative to the through hole (h). In this case, there is an advantage that the position of the storage part gripper (110) can be easily adjusted even when the thickness of the storage part (12a) varies depending on the model type of the secondary battery (10).

[0067] Meanwhile, the secondary battery transfer device (100) according to the present invention may further include a position moving part (140) connected to either the edge gripper (120) and the storage part gripper (110) to move the position of the edge gripper (120) and the storage part gripper (110).

[0068] And the above position moving part (140) may include a main body (141); and a pair of arm parts (142) connected to at least one of the main body (141), the edge part gripper (120), and the storage part gripper (110).

[0069] Here, the main body (141) may include a frame capable of supporting the pair of arm portions (142) and a driving motor for moving the position of the pair of arm portions (142).

[0070] And the above arm portion (142) is configured to be connected to at least one of the main body (141), the edge portion gripper (120), and the storage portion gripper (110), and various configurations are possible.

[0071] 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 edge portion gripper (120) and the storage portion gripper (110) to move the position of the edge portion gripper (120) and the storage portion gripper (110).

[0072] At this time, a pair of arm portions (142) may be arranged to rotate in an arc from the main body (141) so as to change their positions relative to each other. In this case, the positions of the front and rear of the secondary battery (10) may change relative to each other.

[0073] Meanwhile, the process of the secondary battery (10) being transported by the secondary battery transport device (100) according to the present invention described above will be explained in more detail below with reference to FIGS. 5a and 5b.

[0074] First, FIG. 5a is a drawing showing the storage part gripper (110) and the edge part gripper (120) of the transfer device for the secondary battery (10) gripping the secondary battery (10). In this case, the storage part gripper (110) and the edge part gripper (120) can move forward in a direction that approaches the secondary battery (10) (Y direction based on FIG. 5a), and the gripper units (111A, 111B) of the storage part gripper (110) and the gripper units (121A, 121B) of the edge part gripper (120) can each press and fix the storage part (12a) and the edge part (12b), respectively. At this time, the electrolyte (E) contained in the storage unit (12a) can move from the edge of the storage unit (12a) toward the center as the gripper units (111A, 111B) of the storage unit gripper (110) pressurize the storage unit (12a).

[0075] FIG. 5b is a drawing showing a secondary battery (10) in an inverted state, gripped by a storage gripper (110) and a rim gripper (120). In this case, the secondary battery (10) can be inverted by rotating an arm (142) connected to at least one of the storage gripper (110) and the rim gripper (120) in an arc from the main body (141). At this time, the positions of the front and rear of the secondary battery (10) can be interchanged.

[0076] Here, the electrolyte (E) flows vigorously inside the storage section (12a) when the secondary battery (10) is inverted, but since the edge of the storage section (12a) is pressurized by the storage section gripper (110), the electrolyte (E) cannot reach the edge of the storage section (12a), thereby preventing the separator from folding.

[0077] FIG. 5c is a diagram showing the flow of electrolyte (E) immediately after the secondary battery (10), which is gripped by the storage portion gripper (110) and the edge portion gripper (120), is inverted. At this time, the electrolyte (E) still has fluidity and can flow inside the storage portion (12a), but as in FIG. 5b, the edge of the storage portion (12a) is pressurized by the storage portion gripper (110), so the electrolyte (E) cannot reach the edge of the storage portion (12a). Therefore, the folding of the separator can be prevented even immediately after the secondary battery (10) is inverted.

[0078] FIG. 5d is a drawing showing that the electrolyte (E) does not flow after the secondary battery (10), which is gripped by the storage unit gripper (110) and the edge unit gripper (120), is inverted. At this time, since the electrolyte (E) no longer flows, the separator folding may no longer occur. Accordingly, the gripper units (111A, 111B) of the storage unit gripper (110) and the gripper units (121A, 121B) of the edge unit gripper (120) can release the pressure on the storage unit (12a) and the edge unit (12b). At this time, some of the electrolyte (E) contained in the storage unit (12a) can move back toward the edge of the storage unit (12a) as the pressure on the gripper units (111A, 111B) of the storage unit gripper (110) is released. And the above storage part gripper (110) and the above edge part gripper (120) can move backward in a direction away from the secondary heaven and earth (opposite direction of the Y direction based on Fig. 5d).

[0079] Example 2

[0080] Embodiment 2 of the present invention differs in that some shapes of the gripper units (111A, 111B) of the storage portion gripper (110) and the gripper units (121A, 121B) of the edge portion gripper (120) are different from some shapes of the gripper units (111A, 111B) of the storage portion gripper (110) and the gripper units (121A, 121B) of the edge portion gripper (120) according to Embodiment 1.

[0081] Content common to Example 1 will be omitted as much as possible, and Example 2 will be described focusing on the differences. That is, it is obvious that if content not explained in Example 2 is needed, it can be considered as content of Example 1.

[0082] First, FIG. 6 illustrates the gripper unit (111A) of the storage unit gripper (110). Here, the end of the gripper unit (111A) may be formed such that the surface facing the battery case (12) slopes toward the opposite direction of the battery case (12) as it approaches the end. That is, on the end of the gripper unit (111A) facing the battery case (12), a sloped surface (R1) may be formed such that it slopes toward the opposite direction of the battery case (12) as it approaches the end. Here, FIG. 6 illustrates only one of the pair of gripper units (111A, 111B) facing the battery case (12), but it is obvious that the other gripper unit (111B) may also have the sloped surface formed thereon.

[0083] In this case, even if at least one of the storage unit gripper (110) and the secondary battery (10) is partially misaligned from a preset position, the storage unit gripper (110) 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 storage unit (12a) due to mutual interference between the storage unit gripper (110) and the storage unit (12a).

[0084] Likewise, referring to FIG. 7, the end of the gripper unit (121A) of the edge gripper (120) may be formed such that the surface facing the battery case (12) slopes toward the opposite direction of the battery case (12) as it approaches the end.

[0085] That is, on the end portion of the gripper unit (121A) facing the battery case (12), an inclined surface (R2) can be formed that slopes toward the opposite direction of the battery case (12) as it approaches the end. Here, in FIG. 7, only one of the pair of gripper units (121A, 121B) facing the battery case (12) is shown, but it is obvious that the other gripper unit (121B) can also have the aforementioned inclined surface formed.

[0086] In this case, even if at least one of the edge gripper (120) and the secondary battery (10) is partially misaligned from a preset position, the edge gripper (120) can guide and move the position of the secondary battery (10) while advancing toward the battery case (12), thereby minimizing damage that may occur to the edge portion (12b) due to mutual interference between the edge gripper (120) and the edge portion (12b).

[0087] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0088] 10: Secondary battery 11: Electrode assembly 12: Battery case 12a: Storage compartment 12b: Border 13: Electrode Lead 100: Transfer device for secondary batteries 110: Storage compartment gripper 111A: Gripper Unit 111B: Gripper Unit 112: Cushioning pad 120: Edge gripper 121A: Gripper Unit 121B: Gripper Unit 122: Friction pad 130: Connection 140: Position movement part 141: Main body 142: Aambu 150: Fixed part E: Electrolyte R1: Inclined surface of the gripper unit included in the storage gripper R2: Inclined surface of the gripper unit included in the rim gripper h: through hole

Claims

Claim 1 An apparatus for manufacturing a secondary battery comprising: an electrode assembly having electrodes and a separator alternately stacked; and a battery case accommodating the electrode assembly, wherein the apparatus comprises: a pair of storage grippers for gripping a storage portion in which the electrode assembly is stored in the battery case; and a pair of edge grippers for gripping an edge portion extending from the edge of the storage portion in the battery case, wherein the storage grippers are provided to grip the edge of the storage portion, and the storage grippers extend along the edge of the storage portion to act as a dam preventing an electrolyte injected into the storage portion from flowing to the edge portion of the separator. Claim 2 delete Claim 3 The secondary battery according to claim 1, further comprising an electrode lead formed protruding from at least one end of a battery case; and a transfer device for a secondary battery, wherein the storage portion gripper is provided to grip the edge of the storage portion adjacent to the electrode lead. Claim 4 A transfer device for a secondary battery according to claim 1, wherein the edge gripper comprises a pair of gripper units arranged to face each other with the battery case in between and having an adjustable spacing between them. Claim 5 A transfer device for a secondary battery according to claim 4, wherein the end of the gripper unit is formed such that the surface facing the battery case is inclined toward the opposite direction of the battery case as it approaches the end. Claim 6 A transfer device for a secondary battery according to claim 4, wherein the edge gripper further comprises a friction pad provided on the surface facing the battery case in the gripper unit. Claim 7 A transfer device for a secondary battery according to claim 6, wherein the material of the friction pad comprises rubber. Claim 8 A transfer device for a secondary battery according to claim 1, wherein the storage portion gripper comprises a pair of gripper units arranged to face each other with the battery case in between and having an adjustable spacing between them. Claim 9 A transfer device for a secondary battery according to claim 8, wherein the end of the gripper unit is formed such that the surface facing the battery case is inclined toward the opposite direction of the battery case as it approaches the end. Claim 10 A transfer device for a secondary battery according to claim 8, wherein the storage portion gripper further comprises a cushioning pad provided on the surface facing the battery case in the gripper unit. Claim 11 A transfer device for a secondary battery according to claim 10, wherein the material of the buffer pad comprises EVA (Ethylene-Vinyl Acetate). Claim 12 A transfer device for a secondary battery according to claim 1, further comprising at least one connecting part connecting the storage part gripper and the edge part gripper. Claim 13 A transfer device for a secondary battery according to claim 12, wherein the storage portion gripper, the edge portion gripper, and the connecting portion are mutually detachably coupled. Claim 14 A transfer device for a secondary battery according to claim 12, wherein the connecting portion has at least one through hole formed on one side; and further comprising a fixing portion that penetrates the through hole and is fixedly coupled to the storage portion gripper. Claim 15 In claim 14, the through hole has an elliptical shape formed lengthwise along the thickness direction of the connecting part; and the storage part gripper is a transfer device for a secondary battery in which the height with respect to the connecting part is adjusted according to the coupling position of the fixing part with respect to the through hole. Claim 16 A transfer device for a secondary battery according to claim 1, further comprising a position moving part connected to either the edge gripper and the storage part gripper to move the position of the edge gripper and the storage part gripper. Claim 17 A transfer device for a secondary battery according to claim 16, wherein the position moving part comprises: a main body; and a pair of arm parts connected to at least one of the main body, the edge part gripper, and the storage part gripper; and wherein the pair of arm parts are arranged to be rotatable in an arc from the main body so as to change their positions relative to each other.

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