Welding jig inspection table for cylindrical secondary battery and method for inspecting welding jig for cylindrical secondary battery using same

Abstract

The present invention provides an inspection table for inspecting a welding jig used in manufacturing a cylindrical secondary battery, the inspection table comprising: a base plate having a flat configuration and disposed horizontally, on an upper surface of which the welding jig is disposed; a master electrode assembly having a cylindrical shape, a first through-hole formed along a longitudinal direction at a radial center thereof, and being disposed laterally in the welding jig; a master jig disposed on one side of the base plate and having a third through-hole formed coaxially with the first through-hole; and a plurality of master pins having different diameters from each other and each having a predetermined length so as to pass through the first through-hole and be inserted into the third through-hole.

Description

Inspection table for welding jigs for cylindrical secondary batteries and method for inspecting welding jigs for cylindrical secondary batteries using the same

[0001] The present invention relates to a welding jig inspection table for cylindrical secondary batteries and a welding jig inspection method for cylindrical secondary batteries using the same. Specifically, the invention relates to a welding jig inspection table for cylindrical secondary batteries and a welding jig inspection method for cylindrical secondary batteries using the same, which can be positioned within a cylindrical secondary battery manufacturing line to reduce unnecessary time consumed in inspecting the welding jig and to enable quick and convenient inspection.

[0002]

[0003] Secondary batteries, which offer high applicability across product categories and possess electrical characteristics such as high energy density, are widely applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric driving sources.

[0004] These secondary batteries are attracting attention as a new energy source for improving eco-friendliness and energy efficiency, as they not only have the primary advantage of being able to drastically reduce the use of fossil fuels but also the advantage of not generating any by-products from the use of energy.

[0005] Depending on the structure of the electrode assembly having a positive electrode / separator / negative electrode structure, secondary batteries may include a jelly-roll (wound type) electrode assembly in which long sheet-type positive and negative electrodes are wound with a separator interposed; a stack type (stacked type) electrode assembly in which a plurality of positive and negative electrodes cut into units of a predetermined size are sequentially stacked with a separator interposed; and a stack / folding type electrode assembly in which bicells or full cells in which positive and negative electrodes of a predetermined unit are stacked with a separator interposed are wound.

[0006] In addition, secondary batteries are classified according to the shape of the battery case into cylindrical and prismatic batteries, in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is embedded in a pouch-type case made of an aluminum laminate sheet.

[0007] At one end of an electrode (positive electrode, negative electrode) of such a secondary battery (particularly a secondary battery including a stacked electrode assembly), an electrode tab connected to a lead portion connecting the electrode and an external terminal is provided protruding from one side of the electrode assembly.

[0008] At this time, the lead and the electrode tab are mainly connected through welding methods such as resistance welding (a welding method in which a large current is passed through the joint of the base material to create resistance heat, which causes the joint to become semi-molten, and pressure is applied to join them), laser welding, and ultrasonic welding.

[0009] In addition, in the case of a cylindrical secondary battery, the negative tab is resistance welded to the can, so the can acts as the negative terminal.

[0010]

[0011] Figure 1 is a schematic diagram showing a vertical cross-section of a conventional cylindrical secondary battery.

[0012] To explain the cylindrical secondary battery in more detail, the cylindrical secondary battery (100) includes an electrode assembly (110) comprising a positive electrode (111), a negative electrode (113), and a separator as shown in FIG. 1, a can (120) that accommodates the electrode assembly (110) inside and has an opening formed at the top, and a cap assembly (130) that closes or seals the opening at the top of the can (120).

[0013] Additionally, an anode tab (115) is connected to the anode (111) of the electrode assembly (110), and the anode tab (115) is connected to the cap assembly (130) by welding.

[0014]

[0015] Additionally, a cathode tab (117) is connected to the cathode (113) of the electrode assembly (110), and the cathode tab (117) is connected to the bottom surface of the can (120) through resistance welding.

[0016]

[0017] FIG. 2 is a schematic diagram showing the state before resistance welding the negative electrode tab of a conventional cylindrical secondary battery to a can, and FIG. 3 is a schematic diagram showing the state of welding the negative electrode tab to a can by inserting a welding rod into a conventional cylindrical secondary battery.

[0018] The negative electrode tab (117) of a conventional cylindrical secondary battery (100) is connected to and extended to the negative electrode as shown in FIG. 2 and is drawn out to the bottom of the electrode assembly (110).

[0019] And, as shown in FIG. 3, this cathode tab (117) is electrically connected to the bottom surface of the can (120) through resistance welding.

[0020] To explain this more specifically, first, as shown in FIG. 2, an electrode assembly (110) is housed inside the can (120) through the upper opening of the can (120).

[0021] Afterwards, as shown in FIG. 3, for welding the cathode tab (117) and the bottom surface of the can (120), a welding rod (220) is inserted from the upper opening of the can (120) into the hollow formed in the center of the electrode assembly (110), and then the cathode tab (117) and the bottom surface of the can (120) are welded and fixed by the welding rod (220) inserted inside the can (120) and the welding member (150) provided outside the can (120).

[0022] However, when resistance welding the cathode tab to the can as described above, if the welding angle is incorrect, spatter may occur where fine molten metal particles scatter around the weld area, which can lead to low voltage failure problems.

[0023] In other words, this is due to the influence of the verticality of the welding rod. When the welding surface between the welding rod and the workpiece (i.e., the cathode tab and can) is not vertical (i.e., the verticality is distorted), the contact area is reduced, and spatter occurs due to overmelting caused by increased heat generation.

[0024] Meanwhile, in the past, to inspect welding jigs used in the manufacture of cylindrical secondary batteries, the welding jig was removed and a request was made to an external company for 3D measurement, or dimensions such as concentricity, verticality, and horizontality were verified using measuring equipment owned by the company.

[0025] As such, conventionally, there was a problem in that excessive personnel and time were consumed in removing the welding jig, taking it outside, inspecting it, and then deriving and analyzing the results.

[0026]

[0027] [Prior Art Literature]

[0028] [Patent Document] KR 10-2023-0053831 A (Published April 24, 2023)

[0029]

[0030] The present invention has been devised to solve the various conventional problems described above, and aims to provide a welding jig inspection table for cylindrical secondary batteries and a welding jig inspection method for cylindrical secondary batteries using the same, which can be positioned within a cylindrical secondary battery manufacturing line to reduce unnecessary time consumed in inspecting the welding jig and to perform inspection quickly and conveniently.

[0031]

[0032] To achieve the above objectives, a welding jig inspection table for a cylindrical secondary battery according to the first aspect of the present invention may comprise: a base plate formed in the shape of a flat plate and arranged horizontally, on which the welding jig is placed; a master electrode assembly formed in a cylindrical shape, having a first through hole formed along the longitudinal direction at the radial center and arranged horizontally on the welding jig; a master jig arranged on one side of the base plate and having a third through hole formed concentrically with the first through hole; and a plurality of master pins provided with mutually different diameters and having a predetermined length so as to pass through the first through hole and be inserted into the third through hole.

[0033] The device further includes a frame located at the lower part of the base plate to support the base plate, and the frame may have a predetermined height and be configured to allow height adjustment as needed.

[0034] Multiple supports having a cushioning function may be provided at the bottom of the above frame.

[0035] A plurality of first fastening holes may be formed in the base plate so that a plurality of welding jigs are spaced apart from each other and fastened to each other.

[0036] A master electrode assembly can be placed in each of the above plurality of welding jigs.

[0037] A second fastening hole is formed in the base plate, and a third fastening groove is formed in the master jig to communicate with the second fastening hole, and a predetermined fastening mechanism can be fastened to the third fastening groove through the second fastening hole.

[0038] In the above master jig, a plurality of third through holes may be formed so as to be located on a concentric line with the first through hole of the master electrode assembly, which is respectively disposed in each of the plurality of welding jigs.

[0039] The above master electrode assembly is preferably formed in the shape of a jelly roll.

[0040] A plurality of second through holes may be formed along the length direction of the master electrode assembly, spaced apart from each other, around the first through hole of the master electrode assembly.

[0041] The welding jig is formed with an open top, and a seating space may be formed in the welding jig through the open top to accommodate the master electrode assembly.

[0042] The inner surface of the above-mentioned mounting space can be formed to correspond to the outer surface of the above-mentioned master electrode assembly.

[0043] A fixing member for fixing the master electrode assembly is installed on the front and rear sides of the above-mentioned mounting space, respectively, and a fourth through hole is formed at the center of the fixing member, and it is preferable that the fourth through hole is located on a concentric line with the first through hole and the third through hole.

[0044] Meanwhile, a welding jig inspection method for a cylindrical secondary battery according to the second aspect of the present invention is a welding jig inspection method for a cylindrical secondary battery using the aforementioned welding jig inspection table for a cylindrical secondary battery, wherein a master pin with a small diameter is inserted into a third through hole of the master jig through a first through hole of the master electrode assembly in order from a master pin with a small diameter to a master pin with a large diameter, the insertion operation is performed until the master pin is not inserted into the first through hole and the third through hole, and the level of concentricity is determined through the diameter of the master pin that is not inserted into the first through hole and the third through hole.

[0045]

[0046] According to the means for solving the aforementioned problem, the present invention has the following effects.

[0047] The present invention has the effect of reducing unnecessary time consumed in inspecting welding jigs and enabling quick and convenient inspection by positioning a welding jig inspection table, including a frame, a base plate, a master electrode assembly, a master jig, and a master pin, within a cylindrical secondary battery manufacturing line.

[0048] In addition, the present invention allows multiple welding jigs to be inspected in a single inspection operation by arranging multiple welding jigs on a welding jig inspection table, thereby significantly reducing inspection time and consequently reducing costs.

[0049] In addition, the present invention has the effect of preventing deformation of the welding jig when the master electrode assembly is repeatedly fastened and detached from the welding jig by reducing the weight of the master electrode assembly by forming a plurality of second through holes around the first through hole of the master electrode assembly.

[0050] Furthermore, since the present invention performs inspection by inserting the master pins in order from the smallest diameter to the largest diameter through the first through hole of the master electrode assembly into the third through hole of the master jig, it has the effect of enabling even a novice, who is not an expert, to easily perform the inspection.

[0051]

[0052] Figure 1 is a schematic diagram showing a vertical cross-section of a conventional cylindrical secondary battery.

[0053] Figure 2 is a schematic diagram showing the state of a conventional cylindrical secondary battery before resistance welding the negative electrode tab to the can.

[0054] Figure 3 is a schematic diagram showing the state of welding a negative electrode tab to a can by inserting a welding rod into a conventional cylindrical secondary battery.

[0055] FIG. 4 is a drawing showing a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0056] Figure 5 is a drawing showing an enlarged view of part A in Figure 4.

[0057] FIG. 6 is a drawing showing a base plate employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0058] FIG. 7 is a drawing showing a radial cross-section of a master electrode assembly employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0059] FIG. 8 is a side view of a master electrode assembly employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0060] FIG. 9 is a drawing showing a master jig employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0061] Figure 10 is a drawing showing the master jig of Figure 9 viewed from the side.

[0062] FIG. 11 is a drawing showing a master pin employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0063] FIG. 12 is a drawing showing a state in which a plurality of welding jigs are fastened to a base plate coupled to a frame in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0064] Figure 13 is a drawing showing an enlarged view of part B in Figure 12.

[0065]

[0066] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Accordingly, in some embodiments, well-known process steps, well-known device structures, and well-known techniques are not specifically described to avoid the present invention being interpreted ambiguously. Throughout the specification, like reference numerals refer to like components.

[0067] In drawings, thicknesses may be enlarged to clearly represent multiple layers and regions. Throughout the specification, the same reference numerals are used for similar parts. When a part such as a layer, film, region, or plate is described as being "above" another part, this includes not only cases where it is "immediately above" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately above" another part, it means that there is no other part in between. Furthermore, when a part such as a layer, film, region, or plate is described as being "below" another part, this includes not only cases where it is "immediately below" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately below" another part, it means that there is no other part in between.

[0068] FIG. 4 is a drawing showing a welding jig inspection table for a cylindrical secondary battery according to the present invention, and FIG. 5 is a drawing showing an enlarged view of part A in FIG. 4.

[0069] A welding jig inspection table (10) for a cylindrical secondary battery according to the present invention is an inspection table for inspecting a welding jig (20) used to manufacture a cylindrical secondary battery, and comprises a frame (11), a base plate (12), a master electrode assembly (13), a master jig (14), and a master pin (15).

[0070] That is, the welding jig inspection table (10) according to the present invention is positioned within a cylindrical secondary battery manufacturing line so that the welding jig (20) can be inspected within the manufacturing line without taking the welding jig (20) outside.

[0071] Accordingly, unnecessary time spent inspecting the welding jig (20) can be reduced, and the inspection can be performed quickly and conveniently.

[0072] The base plate (12), master electrode assembly (13), master jig (14), and master pin (15) employed in the welding jig inspection table (10) according to the present invention will be described later with reference to FIGS. 6 to 13.

[0073] The base plate (12), master electrode assembly (13), master jig (14), and master pin (15) require precision machining, for example, considering surface roughness, geometric tolerances, etc.

[0074] The frame (11) is located at the bottom of the base plate (12) to support the base plate (12) and is formed to have a predetermined height.

[0075] Such a frame (11) may have an overall cuboid shape, and individual unit frames may be assembled to form a cuboid shape, or it may be made of a single body to form a cuboid shape.

[0076] In addition, the frame (11) can be configured to be adjustable in height according to the worker's height so that the worker can conveniently perform inspection work.

[0077] Additionally, a plurality of supports (11a) having a cushioning function may be provided at the bottom of the frame (11), and the height of the frame (11) can be adjusted by adjusting the length of such supports (11a).

[0078] As a configuration for adjusting the length of such a base (11a), for example, a screw groove with a first screw thread can be formed on the bottom portion of the frame (11), and a second screw thread can be formed on the outer surface of the base (11a) to correspond to the first screw thread. When the base (11a) is rotated, the first screw thread of the screw groove formed on the bottom surface of the frame (11) and the second screw thread of the base (11a) move in a screw motion, thereby enabling the base (11a) to become longer or shorter.

[0079] In addition to this, if the height of the frame (11) can be adjusted, it can be implemented in any other configuration.

[0080] Meanwhile, a level may be installed on the frame (11) to check the horizontal state of the base plate (12) placed on the upper surface of the frame (11).

[0081]

[0082] FIG. 6 is a drawing showing a base plate employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0083] The base plate (12) is made of a rectangular flat plate having a predetermined thickness and is placed horizontally on the upper part of the frame (11).

[0084] When defects occur continuously during the operation of the manufacturing line for a cylindrical secondary battery, a welding jig (20) removed from the manufacturing line is placed on the upper surface of the base plate (12).

[0085] A first fastening hole (F1) is formed through the base plate (12) in the thickness direction so that a welding jig (20) can be fastened.

[0086] Preferably, a pair of first fastening holes (F1) may be formed spaced apart from each other along the width direction of the base plate (12).

[0087] A predetermined fastening mechanism, such as a bolt, is fastened to the bottom surface of a welding jig (20) placed on a base plate (12) through this pair of first fastening holes (F1).

[0088] Meanwhile, a pair of first fastening holes (F1) formed along the width direction of the base plate (12) may be formed in multiple numbers along the length direction of the base plate (12).

[0089] This is to place a plurality of welding jigs (20) on the base plate (12).

[0090] Additionally, a second fastening hole (F2) is formed through the thickness direction at one end of the base plate (12) in the longitudinal direction, and a third fastening groove (F3) is formed in the master jig (14) described later to communicate with the second fastening hole (F2).

[0091] Accordingly, as a predetermined fastening mechanism, such as a bolt, is fastened to the third fastening groove (F3) through the second fastening hole (F2), the master jig (14) is fastened to the base plate (12).

[0092]

[0093] FIG. 7 is a drawing showing a radial cross-section of a master electrode assembly employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention, and FIG. 8 is a side view of a master electrode assembly employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0094] The master electrode assembly (13) is manufactured to have an appearance almost identical to that of a jelly roll-shaped electrode assembly used in actual cylindrical secondary batteries and is used to inspect various dimensions of the welding jig (20).

[0095] Accordingly, the master electrode assembly (13) employed in the present invention is formed in a cylindrical shape in the form of a jelly roll, similar to the jelly roll-shaped electrode assembly employed in an actual cylindrical secondary battery.

[0096] A first through hole (T1) is formed along the length direction at the radial center of the master electrode assembly (13), and the master electrode assembly (13) is placed horizontally on the welding jig (20) (so that the first through hole (T1) is horizontal).

[0097] A master pin (15) is inserted into a third through hole (T3) formed in a master jig (14) described later through such a first through hole (T1).

[0098] Meanwhile, a plurality of second through holes (T2) may be formed along the length direction of the master electrode assembly (13) at spaced intervals around the first through hole (T1) of the master electrode assembly (13).

[0099] In this way, by forming a plurality of second through holes (T2) around the first through hole (T1) of the master electrode assembly (13), the weight of the master electrode assembly (13) is reduced, thereby preventing the welding jig (20) from being deformed when the master electrode assembly (13) is repeatedly attached to and detached from the welding jig (20).

[0100]

[0101] FIG. 9 is a drawing showing a master jig employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention, and FIG. 10 is a drawing showing the master jig of FIG. 9 viewed from the side.

[0102] The master jig (14) is formed in the shape of a rod having a predetermined length and a predetermined width, and both ends are bent downward and then bent horizontally outward. For example, it can be formed in the shape of an L and an inverted L.

[0103] A master jig (14) of this type is positioned on one side of the base plate (12), and a third through hole (T3) is formed that is concentric with the first through hole (T1) formed in the master electrode assembly (13).

[0104] Meanwhile, as described later, a plurality of third through holes (T3) may be formed in the master jig (14) so ​​as to be located on a concentric line with the first through hole (T1) of the master electrode assembly (13) each placed in a plurality of welding jigs (20).

[0105] At both ends of the master jig (14) that are bent downward and then bent horizontally, a third fastening groove (F3) is formed to communicate with a second fastening hole (F2) formed in the base plate (12), and a predetermined fastening mechanism, such as a bolt, can be fastened to the third fastening groove (F3) through the second fastening hole (F2).

[0106]

[0107] FIG. 11 is a drawing showing a master pin employed in a welding jig inspection table for a cylindrical secondary battery according to the present invention.

[0108] Master pins (15) have a predetermined length and are provided in multiple numbers with different diameters.

[0109] The master pin (15) passes through the first through hole (T1) formed in the master electrode assembly (13) and is inserted into the third through hole (T3) formed in the master jig (14).

[0110]

[0111] FIG. 12 is a drawing showing a state in which a plurality of welding jigs are fastened to a base plate coupled to a frame in a welding jig inspection table for a cylindrical secondary battery according to the present invention, and FIG. 13 is a drawing showing an enlarged view of part B in FIG. 12.

[0112] A pair of first fastening holes (F1) formed along the width direction of the base plate (12) are formed in the base plate (12) in multiple numbers along the length direction of the base plate (12) so that a plurality of welding jigs (20) are spaced apart from each other and fastened to each other.

[0113] In addition, a master electrode assembly (13) is placed in each of the multiple welding jigs (20).

[0114] A welding jig (20) of this type is formed with an open top.

[0115] Additionally, a seating space (22) is formed in the welding jig (20) through an open upper portion, into which a master electrode assembly (13) is seated.

[0116] The inner surface of the seating space (22) of the welding jig (20) can be formed to correspond to the outer surface of the master electrode assembly (13).

[0117] For example, the outer circumference of the master electrode assembly (13) may be formed as a circle or an ellipse, and the inner circumference of the inner surface of the seating space (22) of the welding jig (20) may be formed as a semicircle or a semi-ellipse.

[0118] A fixing member (24) for fixing the master electrode assembly (13) is installed on the front and rear sides of the mounting space (22) as described above.

[0119] A fourth through hole (T4) is formed in the center of the fixed member (24), and the edge portion of the fixed member (24) is fixed to the front and rear of the master electrode assembly (13), respectively.

[0120] The fourth through hole (T4) of the fixed member (24) is located concentrically with the first through hole (T1) of the master electrode assembly (13) and the third through hole (T3) of the master jig (14).

[0121] As such, the present invention has the advantage of significantly reducing inspection time and reducing costs by arranging a plurality of welding jigs (20) on a welding jig inspection table (10) so that multiple welding jigs (20) can be inspected in a single inspection operation.

[0122] Meanwhile, the welding jig inspection method for a cylindrical secondary battery according to the present invention is a welding jig inspection method for a cylindrical secondary battery using the aforementioned welding jig inspection table (10) for a cylindrical secondary battery.

[0123] Specifically, the master pins (15) are inserted into the third through hole (T3) of the master jig (14) through the first through hole (T1) of the master electrode assembly (13) in order from the master pin (15) with a small diameter to the master pin (15) with a large diameter.

[0124] The insertion operation of the master pin (15) is performed until the master pin (15) is not inserted into the first through hole (T1) and the third through hole (T3).

[0125] In this way, the level of concentricity can be determined through the diameter of the master pin (15) that is not inserted into the first through hole (T1) and the third through hole (T3).

[0126] As such, the present invention performs inspection by inserting the master pin (15) with a small diameter into the third through hole (T3) of the master jig (14) through the first through hole (T1) of the master electrode assembly (13) in order from the master pin (15) with a small diameter to the master pin (15) with a large diameter, so that even a beginner who is not skilled can easily perform the inspection.

[0127]

[0128] [Explanation of the symbol]

[0129] 10: Welding Jig Inspection Table

[0130] 11 : Frame

[0131] 12: Base Plate

[0132] 13: Master electrode assembly

[0133] 14: Master Jig

[0134] 15: Master pin

[0135] 20: Welding jig

Claims

1. As an inspection table for inspecting welding jigs used in manufacturing cylindrical secondary batteries, A base plate formed in the shape of a flat plate and arranged horizontally, with the welding jig placed on its upper surface; A master electrode assembly formed in a cylindrical shape, having a first through hole formed along the longitudinal direction at the radial center, and arranged horizontally on the welding jig; A master jig disposed on one side of the base plate and having a third through hole formed therein that is concentric with the first through hole; and A master pin having a predetermined length, provided in a plurality of mutually different diameters and inserted into the third through hole by passing through the first through hole; comprising Inspection table for welding jigs for cylindrical secondary batteries.

2. In Claim 1, It further includes a frame located below the base plate to support the base plate, and The above frame has a predetermined height and is provided to allow height adjustment as needed. Inspection table for welding jigs for cylindrical secondary batteries.

3. In Claim 2, A plurality of supports having a cushioning function are provided at the bottom of the above frame. Inspection table for welding jigs for cylindrical secondary batteries.

4. In Claim 1, A plurality of first fastening holes are formed in the base plate above so that a plurality of welding jigs are spaced apart from each other and fastened to each other. Inspection table for welding jigs for cylindrical secondary batteries.

5. In Claim 4, A master electrode assembly is disposed in each of the above plurality of welding jigs, Inspection table for welding jigs for cylindrical secondary batteries.

6. In Claim 5, A second fastening hole is formed in the base plate, and a third fastening groove is formed in the master jig to communicate with the second fastening hole, and a predetermined fastening mechanism is fastened to the third fastening groove through the second fastening hole. Inspection table for welding jigs for cylindrical secondary batteries.

7. In Claim 6, The above master jig has a plurality of third through holes formed so as to be positioned concentrically with the first through hole of the master electrode assembly, which is respectively disposed in the plurality of welding jigs. Inspection table for welding jigs for cylindrical secondary batteries.

8. In Claim 1, The above master electrode assembly is, Formed in the shape of a jelly roll, Inspection table for welding jigs for cylindrical secondary batteries.

9. In Claim 8, A plurality of second through holes are spaced apart from each other and formed along the length direction of the master electrode assembly around the first through hole of the master electrode assembly. Inspection table for welding jigs for cylindrical secondary batteries.

10. In Claim 1, The above welding jig is formed with an open top, and The welding jig has a seating space formed therein through the open upper portion for seating the master electrode assembly. Inspection table for welding jigs for cylindrical secondary batteries.

11. In Claim 10, The inner surface of the above-mentioned mounting space is formed to correspond to the outer surface of the above-mentioned master electrode assembly, Inspection table for welding jigs for cylindrical secondary batteries.

12. In Claim 11, A fixing member for fixing the master electrode assembly is installed on the front and rear sides of the above-mentioned mounting space, respectively, and A fourth through hole is formed in the center of the above-mentioned fixed member, and The fourth through hole is located on a concentric line with the first through hole and the third through hole, Inspection table for welding jigs for cylindrical secondary batteries.

13. A method for inspecting a welding jig for a cylindrical secondary battery using a welding jig inspection table for a cylindrical secondary battery according to any one of claims 1 to 12, wherein Master pins are inserted into the third through hole of the master jig through the first through hole of the master electrode assembly in order from the master pin with the smallest diameter to the master pin with the largest diameter, and the insertion operation is performed until the master pins are not inserted into the first through hole and the third through hole. Determining the level of concentricity through the diameter of the master pin not inserted into the first through hole and the third through hole, Inspection method for welding jigs for cylindrical secondary batteries.

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