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

Abstract

A kind of welding fixture inspection platform for cylindrical secondary battery for checking welding fixture for manufacturing cylindrical secondary battery includes: bottom plate, which is formed into flat plate shape and is horizontally arranged, the upper surface of which is provided with welding fixture;Main electrode assembly, which is formed into cylindrical shape, a first through-hole is formed in the radial central portion of main electrode assembly along the length direction and is transversely arranged in welding fixture;Main clamp, which is arranged at one side of bottom plate, and is formed with third through-hole, which is configured to be arranged on the concentric line of the first through-hole of main electrode assembly;And multiple main pins with mutually different diameters, each main pin has a predetermined length, so that it is inserted into the third through-hole of main clamp after passing through the first through-hole of main electrode assembly.

Description

Technical Field

[0001] This disclosure relates to an inspection table for welding fixtures used in cylindrical secondary batteries and a method for inspecting welding fixtures for cylindrical secondary batteries using the inspection table. Specifically, this disclosure relates to an inspection table for welding fixtures used in cylindrical secondary batteries and a method for inspecting welding fixtures for cylindrical secondary batteries using the inspection table, wherein unnecessary time spent inspecting welding fixtures is reduced by positioning the welding fixtures inside the production line of cylindrical secondary batteries, and the welding fixtures are inspected quickly and conveniently. Background Technology

[0002] Secondary batteries, which are highly suitable for product groups and have electrical characteristics such as high energy density, are not only widely used in portable devices, but also in electric vehicles (EVs) or hybrid electric vehicles (HEVs) powered by electric power sources.

[0003] Secondary batteries have attracted attention as a new energy source for improving environmental friendliness and energy efficiency because they not only have the major advantage of significantly reducing the use of fossil fuels, but also have the advantage of producing no by-products at all.

[0004] According to the structure of the electrode assembly having a positive electrode / separator / negative electrode structure, the secondary battery may include: a wound electrode assembly in which long sheet-shaped positive and negative electrodes are wound with a separator inserted therebetween; a stacked electrode assembly in which multiple positive and negative electrodes cut into cells of predetermined size are sequentially laminated with a separator inserted therebetween; and a stacked / folded electrode assembly in which bicells or full cells laminated with a separator inserted between the positive and negative electrodes of predetermined cells are wound.

[0005] Furthermore, based on the shape of the battery casing, secondary batteries are classified into cylindrical batteries and square batteries in which the electrode assemblies are constructed into cylindrical or square metal cans, and pouch batteries in which the electrode assemblies are constructed into pouch-shaped casings made of aluminum laminates.

[0006] In a secondary battery constructed in this manner (specifically, a secondary battery including a stacked electrode assembly), one end of the electrode (positive electrode, negative electrode) is provided with an electrode connector that connects to a lead portion that connects the electrode to an external terminal. The electrode connector protrudes to one side of the electrode assembly.

[0007] In this case, the lead wire and electrode joint are mainly connected by welding methods, such as resistance welding (which uses resistance heat generated by flowing a large current to the joint of the parent material to bring the joint into a semi-molten state, and applies pressure to the joint to join it), laser welding, and ultrasonic welding.

[0008] Furthermore, in the case of cylindrical secondary batteries, the negative terminal is resistively welded to the can. Therefore, the can acts as the negative terminal.

[0009] Figure 1 This is a schematic diagram showing the vertical cross-section of a typical cylindrical secondary battery.

[0010] More specifically, such as Figure 1 As shown, the cylindrical secondary battery 100 includes: an electrode assembly 110, which includes a positive electrode 111, a negative electrode 113 and a separator; a can 120, which houses the electrode assembly 110 and has an opening at its upper end; and a cover assembly 130, which closes or blocks the opening at the upper end of the can 120.

[0011] In addition, the positive electrode 111 of the electrode assembly 110 is connected to the positive electrode connector 115, and the positive electrode connector 115 is connected to the cover assembly 130 by welding.

[0012] In addition, the negative terminal 117 is connected to the negative terminal 113 of the electrode assembly 110, and the negative terminal 117 is connected to the bottom surface of the tank 120 by resistance welding.

[0013] Figure 2 This is a schematic diagram showing the state of a typical cylindrical secondary battery before the negative terminal is resistance-welded to the can, and Figure 3 This diagram schematically illustrates the state of a welding rod inserted into a typical cylindrical secondary battery and the negative terminal welded to the can.

[0014] like Figure 2 As shown, the negative terminal 117 of a typical cylindrical secondary battery 100 is connected to the negative terminal and extends to and exits from the lower end of the electrode assembly 110.

[0015] like Figure 3 As shown, the negative terminal 117 is electrically connected to the bottom surface of the tank 120 via resistance welding.

[0016] More specifically, firstly, such as Figure 2 As shown, the electrode assembly 110 is housed inside the can 120 through the upper opening of the can 120.

[0017] After that, as Figure 3As shown, in order to weld the negative electrode connector 117 to the bottom surface of the can 120, a welding rod 220 is inserted from the upper opening of the can 120 into the hollow portion formed in the center of the electrode assembly 110, and then the negative electrode connector 117 and the bottom surface of the can 120 are welded and fixed by the welding rod 220 inserted into the can 120 and the welding member 150 provided outside the can 120.

[0018] However, in the case where the negative terminal is resistance welded to the tank as described above, spattering may occur if the welding angle is incorrect, resulting in fine particles of molten metal dispersing around the welded area. Therefore, a low-voltage defect exists.

[0019] In other words, this problem occurs due to the influence of the electrode's perpendicularity. When the welding surfaces of the electrode and the target workpiece (i.e., the negative electrode connector and the can) are not vertical (i.e., no longer maintaining verticality), the contact area decreases, and spatter occurs due to over-melting caused by increased heat.

[0020] Meanwhile, in the prior art, in order to inspect the welding fixture used to manufacture cylindrical secondary batteries, the welding fixture is removed and 3D measurement is requested from an external company, or the dimensions of concentricity / verticality / horizontality are checked using the company's own measuring equipment.

[0021] In this way, the problem with the existing technology is that it consumes too much manpower and time in removing welding fixtures, performing welding fixture operations, inspecting welding fixtures, and exporting and analyzing inspection results.

[0022] [Existing Technical Documents]

[0023] [Patent Document] Korean Patent No. 10-2023-0053831A (April 24, 2023) Summary of the Invention

[0024] Technical issues

[0025] This disclosure has been made to address various problems in the related art as described above, and the purpose of this disclosure is to provide a welding fixture inspection table for cylindrical secondary batteries and a welding fixture inspection method using the welding fixture inspection table for cylindrical secondary batteries, wherein unnecessary time consumed in inspecting welding fixtures is reduced by positioning the welding fixtures inside the production line of cylindrical secondary batteries, and the welding fixtures are inspected quickly and conveniently.

[0026] Technical solution

[0027] According to a first aspect of this disclosure, in order to achieve the above-mentioned objective, a welding fixture inspection table for cylindrical secondary batteries is provided for inspecting welding fixtures used in the manufacture of cylindrical secondary batteries. The welding fixture inspection table includes: a base plate formed in a flat, horizontally disposed form, the base plate having an upper surface configured to support the welding fixture; a main electrode assembly formed in a cylindrical shape, the main electrode assembly having a first through hole extending along a length direction at a radial center of the main electrode assembly, the main electrode assembly being laterally disposed in the welding fixture; a main clamp disposed on one side of the base plate, the main clamp having a third through hole configured to be concentrically arranged with the first through hole; and a plurality of master pins having mutually different diameters, the master pins having a predetermined length, the master pins being configured to be inserted into the third through hole after passing through the first through hole.

[0028] The cylindrical secondary battery welding fixture inspection table may further include a frame located at the lower part of the base plate, the frame being configured to support the base plate. The frame may have a predetermined height and is configured to be adjustable in height as needed.

[0029] Multiple bases with cushioning function can be located at the lower end of the frame.

[0030] Multiple welding fixtures may be provided, and the base plate may include multiple first fastening holes, such that the multiple welding fixtures can be separated from each other while being fastened to the base plate.

[0031] The main electrode assembly can be configured as multiple main electrode assemblies, such that each main electrode assembly is disposed in the multiple welding fixtures.

[0032] The base plate may include a second fastening hole, the main electrode assembly may include a third fastening groove configured to communicate with the second fastening hole, and a predetermined fastening mechanism may be fastened to the third fastening groove through the second fastening hole.

[0033] The third through hole can be configured in multiple ways in the main fixture, such that each of the third through holes is positioned concentrically with the first through hole of the main electrode assembly disposed in each of the multiple welding fixtures.

[0034] The main electrode assembly can be configured to have a core shape.

[0035] The main electrode assembly may include a plurality of second through holes spaced apart from the first through hole surrounding the main electrode assembly, and the second through holes may extend along the length direction of the main electrode assembly.

[0036] The welding fixture may have an open upper portion and may have a mounting space configured to mount the main electrode assembly through the open upper portion.

[0037] The inner surface of the mounting space can be configured to correspond to the outer surface of the main electrode assembly.

[0038] The fixing member is configured to fix the main electrode assembly at the front and rear sides of the mounting space, respectively. The fixing member may include a fourth through hole at the center of the fixing member. The fourth through hole of the main electrode assembly may be positioned concentric with the first through hole and the third through hole.

[0039] Meanwhile, according to a second aspect of this disclosure, a method for inspecting welding fixtures using the aforementioned cylindrical secondary battery welding fixture inspection table is provided. The welding fixture inspection method includes the following steps: sequentially inserting the master pins, from those with smaller diameters to those with larger diameters, into the third through-hole of the main fixture through the first through-hole of the main electrode assembly, performing insertion operations until the master pins can no longer be inserted into the first and third through-holes; and identifying the concentricity level based on the diameter of the master pins that cannot be inserted into the first and third through-holes.

[0040] Invention Effects

[0041] Based on the above technical solution, this disclosure has the following advantages.

[0042] This disclosure achieves the following advantages: A welding fixture inspection table, including a frame, base plate, main electrode assembly, main clamp, and master pin, is located within the production line of cylindrical secondary batteries. In this way, unnecessary time spent inspecting the welding fixtures can be reduced, and the welding fixtures can be inspected quickly and conveniently.

[0043] Furthermore, this disclosure achieves the following advantageous effects: Multiple welding fixtures are arranged in a welding fixture inspection table, and multiple welding fixtures are inspected during a single inspection operation. In this way, inspection time and inspection costs can be significantly reduced.

[0044] Furthermore, this disclosure achieves the following advantageous effects. The weight of the main electrode assembly is reduced by forming a plurality of second through holes around the first through hole of the main electrode assembly. In this way, deformation of the welding fixture can be prevented when the main electrode assembly is repeatedly fastened to and detached from the welding fixture.

[0045] Furthermore, this disclosure achieves the following advantageous effects. Inspection is performed by sequentially inserting master pins, from those with smaller diameters to those with larger diameters, into the third through-hole of the master fixture through the first through-hole of the master electrode assembly. Therefore, even beginners who are not experts can easily perform the inspection. Attached Figure Description

[0046] Figure 1 This is a schematic diagram showing the vertical cross-section of a typical cylindrical secondary battery.

[0047] Figure 2 This is a schematic diagram showing the state of a typical cylindrical secondary battery before the negative terminal is resistively welded to the can.

[0048] Figure 3 This diagram schematically illustrates the state of inserting a welding rod into a typical cylindrical secondary battery to weld the negative terminal to the can.

[0049] Figure 4 This is a diagram showing a welding fixture inspection table for cylindrical secondary batteries according to the present disclosure.

[0050] Figure 5 It is shown Figure 4 The magnified portion of A in the graph.

[0051] Figure 6 This is a diagram showing the base plate used in the welding fixture inspection table for cylindrical secondary batteries according to this disclosure.

[0052] Figure 7 This is a diagram showing a radial cross-section of the main electrode assembly used in the welding fixture inspection table for cylindrical secondary batteries according to the present disclosure.

[0053] Figure 8 This is a side view of the main electrode assembly used in the welding fixture inspection table for cylindrical secondary batteries according to this disclosure.

[0054] Figure 9 This is a diagram showing the main fixture used in the welding fixture inspection table for cylindrical secondary batteries according to the present disclosure.

[0055] Figure 10 This shows the view from the side surface. Figure 9 A diagram showing the state of the main fixture.

[0056] Figure 11 This is a diagram showing the master pin used in the welding fixture inspection table for cylindrical secondary batteries according to this disclosure.

[0057] Figure 12 This is a diagram showing the state in which multiple welding fixtures are fastened to a base plate connected to a frame in a welding fixture inspection table for cylindrical secondary batteries according to this disclosure.

[0058] Figure 13 It is shown Figure 12 The magnified portion of B in the diagram. Detailed Implementation

[0059] The advantages and features of this disclosure, as well as the methods for achieving these advantages and features, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, this disclosure is not limited to the embodiments disclosed below and can be implemented in various different forms. These embodiments are provided only to make the disclosure complete and to fully inform those skilled in the art of the scope of the invention. This disclosure is defined only by the scope of the claims. Therefore, in some embodiments, well-known process steps, well-known equipment structures, and well-known techniques are not specifically described to avoid ambiguity in the interpretation of this disclosure. Throughout the specification, the same reference numerals refer to the same elements.

[0060] To clearly illustrate the multiple layers and regions in the accompanying drawings, thicknesses may be enlarged and shown. Similar elements are indicated by the same reference numerals throughout the specification. When describing a portion, such as a layer, film, region, or plate, as existing "above" another portion, this description includes not only the case where one portion is "directly" present "above" another portion, but also the case where another portion is present in between. Conversely, when describing a portion as existing "directly" above another portion, this description implies that no other portion exists in between. Furthermore, when describing a portion, such as a layer, film, region, or plate, as existing "below" another portion, this description includes not only the case where one portion is "directly" present "below" another portion, but also the case where another portion exists in between. Conversely, when describing a portion as existing "directly" below another portion, this description implies that no other portion exists in between.

[0061] Figure 4 This is a diagram showing an inspection table for a welding fixture for cylindrical secondary batteries according to the present disclosure, and Figure 5 It is shown Figure 4 The magnified portion of A in the graph.

[0062] According to this disclosure, the welding fixture inspection table 10 for cylindrical secondary batteries is an inspection table for inspecting the welding fixture 20 used to manufacture cylindrical secondary batteries, and includes a frame 11, a base plate 12, a main electrode assembly 13, a main fixture 14, and a master pin 15.

[0063] In other words, the welding fixture inspection table 10 according to this disclosure is located inside the production line of cylindrical secondary batteries, so that the welding fixture 20 can be inspected inside the production line without performing welding fixture 20.

[0064] Therefore, unnecessary time spent inspecting the welding fixture 20 can be reduced, and the welding fixture 20 can be inspected quickly and conveniently.

[0065] Please refer to later Figures 6 to 13 The base plate 12, main electrode assembly 13, main clamp 14 and main pin 15 used in the welding fixture inspection table 10 according to this disclosure are described.

[0066] For example, considering surface roughness, geometric tolerances, etc., the base plate 12, main electrode assembly 13, main fixture 14 and main pin 15 need to be precision machined.

[0067] The frame 11 is located below the base plate 12 to support the base plate 12 and is formed to have a predetermined height.

[0068] As a whole, the frame 11 constructed in this way can be formed into a hexahedral external shape, and the individual unit frames can be assembled to form a hexahedral shape, or can be formed into a single body to form a hexahedral shape.

[0069] In addition, the frame 11 can be provided to adjust its height according to the operator's height, so that the operator can easily perform inspection operations.

[0070] In addition, multiple bases 11a with buffering function can be provided at the lower end of the frame 11, and the height of the frame 11 can be adjusted by adjusting the length of the bases 11a.

[0071] As a construction for adjusting the length of the base 11a, for example, a threaded groove with a first thread can be formed on the bottom surface of the frame 11, and a second thread can be formed on the outer surface of the base 11a to correspond to the first thread. When the base 11a rotates, the first thread of the threaded groove formed on the bottom surface of the frame 11 and the second thread of the base 11a perform threaded movement. In this way, the base 11a can be lengthened or shortened.

[0072] Alternatively, when the height of frame 11 can be adjusted, the length can be adjusted using any other configuration.

[0073] Meanwhile, a level can be installed in the frame 11 to check the level of the base plate 12 set on the upper surface of the frame 11.

[0074] Figure 6 This is a diagram showing the base plate used in the welding fixture inspection table for cylindrical secondary batteries according to this disclosure.

[0075] The base plate 12 is formed of a rectangular flat plate with a predetermined thickness and is horizontally disposed in the upper part of the frame 11.

[0076] When defects occur continuously during operation of the cylindrical secondary battery production line, the welding fixture 20 removed from the production line is placed on the upper surface of the base plate 12.

[0077] The base plate 12 has a first fastening hole F1 that extends through the thickness direction, which enables the welding fixture 20 to be fastened.

[0078] Preferably, a pair of first fastening holes F1 can be formed separately from each other along the width direction of the base plate 12.

[0079] A predetermined fastening mechanism, such as a bolt, is fastened to the bottom surface of a welding fixture 20 disposed in a base plate 12 via a pair of first fastening holes F1.

[0080] Meanwhile, multiple pairs of first fastening holes F1 formed along the width direction of the base plate 12 can be formed along the length direction of the base plate 12.

[0081] This is to accommodate multiple welding fixtures 20 in the base plate 12.

[0082] Furthermore, a second fastening hole F2 extending through the thickness direction is formed on one end of the base plate 12 in the length direction, and a third fastening groove F3 communicating with the second fastening hole F2 is formed in the main clamp 14 (described later).

[0083] Therefore, a fastening mechanism such as a bolt is fastened to the third fastening groove F3 through the second fastening hole F2. Thus, the main clamp 14 is fastened to the bottom plate 12.

[0084] Figure 7 This is a diagram showing the radial cross-section of the main electrode assembly used in the welding fixture inspection table for cylindrical secondary batteries according to this disclosure, and Figure 8 This is a side view of the main electrode assembly used in the welding fixture inspection table for cylindrical secondary batteries according to this disclosure.

[0085] The main electrode assembly 13 is manufactured to have an appearance that is almost similar to that of an electrode assembly with a core shape used in actual cylindrical secondary batteries, and is used to inspect the various dimensions of the welding fixture 20.

[0086] Therefore, the main electrode assembly 13 used in this disclosure is formed in a core-type cylindrical shape, just like the core-shaped electrode assembly used in actual cylindrical secondary batteries.

[0087] The first through hole T1 is formed along the length direction at the radial center of the main electrode assembly 13, and the main electrode assembly 13 is arranged laterally (so that the first through hole T1 is horizontal) in the welding fixture 20.

[0088] The main pin 15 is inserted into the third through hole T3 formed in the main clamp 14 (described later) through the first through hole T1 formed in this way.

[0089] Meanwhile, multiple second through holes T2 can be separated from each other around the first through hole T1 of the main electrode assembly 13, and can be formed to penetrate along the length direction of the main electrode assembly 13.

[0090] Because multiple second through holes T2 are formed around the first through hole T1 of the main electrode assembly 13 in this manner, the weight of the main electrode assembly 13 is reduced. In this way, deformation of the welding fixture 20 can be prevented when the main electrode assembly 13 is repeatedly fastened to and separated from the welding fixture 20.

[0091] Figure 9 This is a diagram showing the main fixture used in the welding fixture inspection table for cylindrical secondary batteries according to this disclosure, and Figure 10 This shows the view from the side surface. Figure 9 A diagram showing the state of the main fixture.

[0092] The main clamp 14 is formed as a rod with a predetermined length and a predetermined width, and has two ends that bend downwards and then laterally outwards. For example, the main clamp 14 can be formed as a U-shape or an inverted U-shape.

[0093] The main clamp 14 is disposed on one side of the base plate 12, and a third through hole T3 is formed therein, which is concentrically positioned with the first through hole T1 formed in the main electrode assembly 13.

[0094] Meanwhile, in the main fixture 14, as will be described later, a plurality of third through holes T3 can be formed to be concentrically positioned with the first through holes T1 of the main electrode assemblies 13 respectively provided in the plurality of welding fixtures 20.

[0095] At the two ends of the main clamp 14 that bend downward and then laterally again, 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.

[0096] Figure 11 This is a diagram showing the master pin used in the welding fixture inspection table for cylindrical secondary batteries according to this disclosure.

[0097] The master pin 15 has a predetermined length, and multiple master pins 15 are configured to have different diameters from each other.

[0098] The master pin 15, configured in this manner, is inserted into the third through hole T3 formed in the main clamp 14 through the first through hole T1 formed in the main electrode assembly 13.

[0099] Figure 12 This is a diagram showing the state in which multiple welding fixtures in the cylindrical secondary battery welding fixture inspection table according to this disclosure are fastened to a base plate connected to a frame, and Figure 13 It is shown Figure 12 The magnified portion of B's ​​image.

[0100] Multiple welding fixtures 20 are separated from each other and fastened within the base plate 12, and a pair of first fastening holes F1 formed along the width direction of the base plate 12 can be formed as multiple holes along the length direction of the base plate 12.

[0101] In addition, the main electrode assembly 13 is disposed in each welding fixture 20.

[0102] The welding fixture 20 configured in this way is formed with an open upper part.

[0103] In addition, the welding fixture 20 has a mounting space 22, on which the main electrode assembly 13 is mounted via an open upper portion.

[0104] The inner surface of the mounting space 22 of the welding fixture 20 can be formed to correspond to the outer surface of the main electrode assembly 13.

[0105] For example, the outer periphery of the main electrode assembly 13 can be formed as a circle or an ellipse, and the inner periphery of the inner surface of the mounting space 22 of the welding fixture 20 can be formed as a semi-circle or a semi-ellipse.

[0106] Fixing members 24 for fixing the main electrode assembly 13 are respectively installed on the front and rear sides of the mounting space 22.

[0107] A fourth through hole T4 is formed at the center of the fixing member 24, and the edge portion of the fixing member 24 is fixed to the front surface and the rear surface of the main electrode assembly 13, respectively.

[0108] The fourth through hole T4 of the fixing member 24 is concentrically positioned with the first through hole T1 of the main electrode assembly 13 and the third through hole T3 of the main clamp 14.

[0109] In this manner, the present disclosure has the following advantages: Multiple welding fixtures 20 are arranged in the welding fixture inspection table 10, and multiple welding fixtures 20 are inspected during a single inspection operation. In this way, inspection time and inspection costs can be significantly reduced.

[0110] Meanwhile, the welding fixture inspection method for cylindrical secondary batteries according to this disclosure is a method for inspecting welding fixtures for cylindrical secondary batteries using the aforementioned welding fixture inspection table 10.

[0111] Specifically, the main pins 15 are sequentially inserted into the third through hole T3 of the main clamp 14 through the first through hole T1 of the main electrode assembly 13, from the main pins 15 with smaller diameters to the main pins 15 with larger diameters.

[0112] Perform this insertion operation of the master pin 15 until the master pin 15 can no longer be inserted into the first through hole T1 and the third through hole T3.

[0113] In this way, the level of concentricity can be identified by the diameter of the master pin 15 that has not yet been inserted into the first through hole T1 and the third through hole T3.

[0114] In this manner, according to this disclosure, the welding fixture 20 is inspected by sequentially inserting the main pins 15, from those with smaller diameters to those with larger diameters, into the third through hole T3 of the main fixture 14 through the first through hole T1 of the main electrode assembly 13. Therefore, even beginners who are not experts can easily perform the inspection.

[0115] [Description of reference numerals in the attached figures]

[0116] 10: Welding fixture inspection table

[0117] 11: Framework

[0118] 12: Base plate

[0119] 13: Main electrode assembly

[0120] 14: Main clamp

[0121] 15: Main Sales

[0122] 20: Welding fixtures

Claims

1. A welding fixture inspection table for cylindrical secondary batteries for inspecting welding fixtures used in the manufacture of cylindrical secondary batteries, the welding fixture inspection table for cylindrical secondary batteries comprising: A flat, horizontally positioned base plate has an upper surface configured to support the welding fixture. A main electrode assembly is formed in the shape of a cylinder, the main electrode assembly having a first through hole extending along the length direction at the radial center of the main electrode assembly, the main electrode assembly being laterally disposed in the welding fixture; The main clamp is disposed on one side of the base plate and has a third through hole, which is configured to be arranged concentrically with the first through hole. as well as Multiple master pins having different diameters and predetermined lengths are configured to be inserted into a third through hole after passing through the first through hole.

2. The cylindrical secondary battery welding fixture inspection table according to claim 1, wherein the cylindrical secondary battery welding fixture inspection table further includes a frame located at the lower part of the base plate, the frame being configured to support the base plate. The frame has a predetermined height and is configured to be adjustable in height as needed.

3. The cylindrical secondary battery welding fixture inspection table according to claim 2, wherein the cylindrical secondary battery welding fixture inspection table further includes a plurality of bases with buffering function located at the lower end of the frame.

4. The inspection table for welding fixtures for cylindrical secondary batteries according to claim 1, wherein, The base plate includes a plurality of first fastening holes, which allow the plurality of welding fixtures to separate from each other while being fastened to the base plate.

5. The inspection table for welding fixtures for cylindrical secondary batteries according to claim 4, wherein, The main electrode assembly is configured as multiple main electrode assemblies, such that each main electrode assembly is disposed in the multiple welding fixtures.

6. The inspection table for welding fixtures for cylindrical secondary batteries according to claim 5, wherein, The base plate includes a second fastening hole. The main clamp includes a third fastening groove configured to communicate with the second fastening hole, and The predetermined fastening mechanism is fastened to the third fastening groove through the second fastening hole.

7. The inspection table for welding fixtures for cylindrical secondary batteries according to claim 6, wherein, The third through hole is provided in a plurality of the main fixture, such that each of the third through holes is positioned concentric with the first through hole of the main electrode assembly provided in each of the plurality of welding fixtures.

8. The inspection table for welding fixtures for cylindrical secondary batteries according to claim 1, wherein, The main electrode assembly is configured to have a core shape.

9. The inspection table for welding fixtures for cylindrical secondary batteries according to claim 8, wherein, The main electrode assembly includes a plurality of second through holes spaced apart from the first through hole surrounding the main electrode assembly, the second through holes extending along the length direction of the main electrode assembly.

10. The inspection table for welding fixtures for cylindrical secondary batteries according to claim 1, wherein, The welding fixture has an open upper part, and The welding fixture has an installation space configured to mount the main electrode assembly via the open upper portion.

11. The welding fixture inspection table for cylindrical secondary batteries according to claim 10, wherein, The inner surface of the mounting space is configured to correspond to the outer surface of the main electrode assembly.

12. The inspection table for welding fixtures for cylindrical secondary batteries according to claim 11, wherein, The fixing members are configured to fix the main electrode assembly at the front and rear sides of the mounting space, respectively. The fixing member includes a fourth through hole at the center of the fixing member, and the fourth through hole is positioned concentrically with the first through hole and the third through hole.

13. A method for inspecting a welding fixture for a cylindrical secondary battery using an inspection table for a welding fixture for a cylindrical secondary battery according to any one of claims 1 to 12, the method comprising the following steps: The main pins are inserted sequentially into the third through hole of the main clamp through the first through hole of the main electrode assembly, from the main pins with smaller diameters to those with larger diameters, performing an insertion operation until the main pins can no longer be inserted into the first and third through holes; and The level of concentricity is identified based on the diameter of the master pin that cannot be inserted into the first and third through holes.

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