Apparatus for inspecting cylindrical battery cartridges

Abstract

The present invention relates to an apparatus for inspecting a cylindrical battery case, comprising: a fixing unit for fixing the cylindrical battery case; a support member attached to the fixing unit to support the fixing unit; a bracket coupled with the support member; an inner diameter measuring unit for measuring the inner diameter of the cylindrical battery case; and a pressure measuring unit coupled to a lower portion of the inner diameter measuring unit, in which a measuring unit including the inner diameter measuring unit and the pressure measuring unit is moved to be inserted into the cylindrical battery case while the cylindrical battery case is fixed to the fixing unit, whereby it is possible to check whether an inner diameter of the cylindrical battery case is in a suitable range.

Description

Technical Field

[0001] This application claims the benefit of priority to Korean Patent Application No. 2024-0086876, filed on July 2, 2024, the disclosure of which is incorporated herein by reference in its entirety.

[0002] This invention relates to a cylindrical battery box inspection device. More specifically, this invention relates to a cylindrical battery box inspection device that is capable of not only determining whether the inner diameter measuring unit is inserted into the cylindrical battery box when measuring the inner diameter of the cylindrical battery box, but also measuring the magnitude of the force applied when the inner diameter measuring part is inserted into the cylindrical battery box. Background Technology

[0003] Lithium-ion secondary batteries can be classified based on the material and form of the battery case in which the electrode assemblies are housed. Specifically, lithium-ion secondary batteries are classified as: cylindrical batteries having electrode assemblies housed in a cylindrical battery case made of metal; prismatic batteries having electrode assemblies housed in a prismatic battery case made of metal; and pouch batteries having electrode assemblies housed in a pouch case manufactured by forming aluminum laminates. Among these batteries, cylindrical batteries have the advantages of relatively large capacity and structural safety.

[0004] Typically, cylindrical batteries are manufactured by receiving a wound electrode assembly in a cylindrical battery case and sealing the cylindrical battery case. The wound electrode assembly is configured such that the positive and negative electrode plates are wound together with spacers inserted between them.

[0005] If the inner diameter of the cylindrical battery box is much larger than the diameter of the wound electrode assembly, the winding of the wound electrode assembly may become loose and space in the cylindrical battery box may be unnecessarily wasted, which is undesirable. If the inner diameter of the cylindrical battery box is approximately equal to the diameter of the wound electrode assembly, the wound electrode assembly may be damaged during insertion into the cylindrical battery box, potentially causing problems in subsequent processes.

[0006] Therefore, during the manufacturing process of cylindrical batteries, inspections are performed to determine whether the diameter of the cylindrical battery case is appropriate. For this purpose, inspection devices called go and no-go gauges can be used, which are cylindrical in shape with a specific diameter. Specifically, the operator determines whether the go and no-go gauges are inserted into the cylindrical battery case while manually inserting them. Situations requiring prevention include: preventing forced insertion while pressing down on the bottom of the cylindrical battery case; preventing the cylindrical battery case from falling from above for insertion; and limited insertion depth only from the end of the cylindrical battery case. However, because the inspection is performed manually by the operator, it is difficult to maintain consistent inspection conditions, such as variations in the magnitude of the force required for insertion or differences in the insertion depth.

[0007] The go gauge and no-go gauge have different inner diameters. If the go gauge is inserted into a cylindrical battery box, the cylindrical battery box is considered good; if the no-go gauge is inserted into a cylindrical battery box, the cylindrical battery box is considered defective. However, even if the go gauge is inserted into a cylindrical battery box, if the force applied to the cylindrical battery box for insertion exceeds a certain level, the cylindrical battery box should be considered defective.

[0008] If the inner diameter of the cylindrical battery case is larger than, but almost equal to, the outer diameter of the wound electrode assembly, the wound electrode assembly will be inserted into the cylindrical battery case via an interference fit, potentially damaging the wound electrode assembly. Therefore, in this case, the cylindrical battery case must be considered defective.

[0009] Therefore, when measuring the inner diameter of a cylindrical battery box, it is necessary to simultaneously measure the pressure applied to the inspection equipment inserted into the cylindrical battery box.

[0010] Patent Document 1 relates to a measuring apparatus and method for easily and accurately measuring the outer and inner diameters of a tubular member, wherein the outer and inner diameters of the tubular member are measured after the tubular member is positioned in the measuring position. However, it is not possible to measure the force required when inserting another portion into the tubular member.

[0011] Patent document 2 discloses a cylindrical battery cell measuring device for measuring the shape of a cylindrical can to be formed, wherein the cylindrical battery cell measuring device is configured to measure and display at least one selected from the group consisting of: the height of the rolled portion and the height of the pressed portion in a cylindrical can having a rolled portion and a pressed portion.

[0012] Since the cylindrical battery cell measuring device disclosed in Patent Document 2 is a device for measuring at least one of the height of the rolled portion and the height of the crimped portion in a cylindrical can that has been formed with rolled portions and / or crimped portions, the patent document does not propose a method for checking the magnitude of the force required when inserting the wound electrode assembly into the cylindrical battery box.

[0013] Therefore, there is a need for a technology that can determine whether the inner diameter of the cylindrical battery box has the dimensions to allow the wound electrode assembly to be inserted into the cylindrical battery box without damage by measuring the pressure when the wound electrode assembly is inserted into the cylindrical battery box at the same time as measuring the inner diameter of the cylindrical battery box.

[0014] (Existing technical documents)

[0015] (Patent Document 1) Japanese Patent Application Publication No. 2017-146188 (August 24, 2017)

[0016] (Patent Document 2) Korean Patent Application Publication No. 2012-0010319 (February 3, 2012) Summary of the Invention

[0017] Technical issues

[0018] The present invention was made in view of the above-mentioned problems, and the object of the present invention is to provide a cylindrical battery box inspection device that can not only measure the inner diameter of the cylindrical battery box, but also check the applied pressure when the wound electrode assembly is inserted into the cylindrical battery box.

[0019] Technical solution

[0020] The cylindrical battery box inspection device according to the present invention for achieving the above-mentioned objectives includes: a fixing unit configured to fix a cylindrical battery box; a support member attached to the fixing unit to support the fixing unit; a bracket to which the support member is connected; an inner diameter measuring unit configured to measure the inner diameter of the cylindrical battery box; and a pressure measuring unit connected to the bottom of the inner diameter measuring unit.

[0021] The cylindrical battery box inspection device may also include a moving unit configured to move the measuring unit, which consists of an inner diameter measuring unit and a pressure measuring unit, up and down.

[0022] The support member may include an upper portion connected to the fixing unit and a lower portion connected to the bracket, and the upper portion may be configured to be connected to the lower portion and to be detached from the lower portion.

[0023] The inner diameter measuring unit can be configured to be connected to the pressure measuring unit and to be detached from the pressure measuring unit.

[0024] The pressure measuring unit may include a recess configured to receive the lower end of the inner diameter measuring unit, and the lower end of the inner diameter measuring unit may be inserted into and secured to the recess.

[0025] The pressure measuring unit may include a male threaded portion protruding from its upper surface, and the inner diameter measuring unit may have a female threaded portion provided on its lower surface. The female threaded portion is formed to be recessed inward and corresponds to the male threaded portion, and the male threaded portion and the female threaded portion can be connected to each other by screw fastening.

[0026] The pressure measuring unit may include a first pressure measuring part and a second pressure measuring part, and the inner diameter measuring unit may include a first inner diameter measuring part and a second inner diameter measuring part. The first pressure measuring part may be connected to the lower end of the first inner diameter measuring part, and the second pressure measuring part may be connected to the lower end of the second inner diameter measuring part. The first pressure measuring part and the second pressure measuring part may be connected to the moving unit, and the rotating body that can rotate on the bracket may be attached to the bottom of the moving unit.

[0027] The fixing unit may include a first fixing portion configured to have a curved shape corresponding to the cylindrical side surface of the cylindrical battery box.

[0028] The fixing unit may include a second fixing part, which is connected to the circular bottom of the cylindrical battery box.

[0029] The fixing unit may include: a first fixing portion configured to have a curved shape corresponding to the cylindrical side surface of the cylindrical battery box; and a second fixing portion connected to the circular bottom of the cylindrical battery box.

[0030] A magnetic material can be added to the connection surface of the fixing unit to the cylindrical battery box, the magnetic material being configured to allow the fixing unit and the cylindrical battery box to be connected to each other due to the magnetic material.

[0031] The internal diameter measuring unit may include a go gauge and a no-go gauge.

[0032] Whenever a go gauge or no-go gauge is connected to the pressure measuring unit, the pressure of the pressure measuring unit can be set to zero.

[0033] Furthermore, the present invention can provide various combinations of the above-described solutions.

[0034] Beneficial effects

[0035] In this invention, the cylindrical battery box inspection device can determine whether the inner diameter of the cylindrical battery box meets the specifications by means of an inner diameter measuring unit when the cylindrical battery box is inserted, and measure the pressure applied to the cylindrical battery box inspection device by means of a pressure measuring unit.

[0036] The measured pressure value can be used to determine whether the size of the cylindrical battery box is unsuitable for inserting the wound electrode assembly into the cylindrical battery box, even if the inner diameter of the cylindrical battery box meets the specifications. Attached Figure Description

[0037] Figure 1 This is a perspective view of the cylindrical battery box inspection device according to the first embodiment.

[0038] Figure 2 This is a perspective view of the cylindrical battery box inspection device according to the second embodiment.

[0039] Figure 3 This is a perspective view showing the inner diameter measuring unit and the pressure measuring unit connected to each other in a cylindrical battery box inspection device according to the present invention.

[0040] Figure 4 This is a perspective view of a cylindrical battery box inspection device according to the third embodiment.

[0041] Figure 5 This is a perspective view of a cylindrical battery box inspection device according to the fourth embodiment.

[0042] Figure 6 This is a perspective view of a cylindrical battery box inspection device according to the fifth embodiment. Detailed Implementation

[0043] Preferred embodiments of the invention will now be described in detail with reference to the accompanying drawings, enabling them to be readily implemented by those skilled in the art. However, in describing the operational principles of the preferred embodiments of the invention, detailed descriptions of known functions and configurations incorporated herein will be omitted where such detailed descriptions might obscure the subject matter of the invention.

[0044] Furthermore, throughout the accompanying drawings, the same reference numerals will be used to refer to parts that perform similar functions or operations. Throughout the specification, when a part is referred to as being connected to another part, this part can be directly connected to said other part, or indirectly connected to said other part via other parts. Additionally, including an element does not mean excluding other elements, but rather means that such elements may be included unless otherwise specified.

[0045] Unless otherwise specifically limited, the description used to implement elements by limitation or addition can be applied to all inventions and does not limit any particular invention.

[0046] In the specification and claims of this application, unless otherwise stated, the singular form is intended to include the plural form.

[0047] In the specification and claims of this application, unless otherwise stated, "or" includes "and". Therefore, "including A or B" means three cases: including A, including B, and including both A and B.

[0048] Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0049] The cylindrical battery box inspection device according to the present invention is a device for measuring the inner diameter of a cylindrical battery box, wherein the cylindrical battery box is a cylindrical battery box without formed rolled edges and / or crimped portions, the cylindrical battery box having an open top, a circular bottom and a cylindrical side surface, wherein the inner diameter of the cylindrical side surface is uniform throughout the side surface.

[0050] When directly inserting a wound electrode assembly into a cylindrical battery box while simultaneously determining the suitability of the cylindrical battery box's inner diameter, the wound electrode assembly may be damaged if the cylindrical battery box is defective. In such cases, the suitability of the cylindrical battery box can be determined by inserting an inner diameter measuring unit into the cylindrical battery box instead of the wound electrode assembly.

[0051] Figure 1 This is a perspective view of the cylindrical battery box inspection device according to the first embodiment.

[0052] Reference Figure 1 The cylindrical battery box inspection device according to the present invention includes: a fixing unit 100 configured to fix a cylindrical battery box 10; a support member 200 attached to the fixing unit 100 to support the fixing unit 100; a bracket 300 connected to the support member 200; an inner diameter measuring unit 410 configured to measure the inner diameter of the cylindrical battery box 10; and a pressure measuring unit 420 connected to the bottom of the inner diameter measuring unit 410.

[0053] The cylindrical battery box 10 is fixed to the fixing unit 100 with its open top facing downwards. A support member 200, formed in the shape of a rod, is attached to the fixing unit 100 and connected to the bracket 300 such that the longitudinal axis of the support member 200 is perpendicular to the upper surface of the bracket 300. The fixing unit 100 is spaced apart from the bracket 300 by a certain distance through the support member 200.

[0054] In one specific example, magnetic material can be added to the connection surface 101 of the fixing unit 100 that is connected to the cylindrical battery box 10, thereby allowing the cylindrical battery box 10 and the fixing unit 100 to be connected to each other by magnetic force. Conversely, when tools such as clamps are used to fix the cylindrical battery box, the cylindrical battery box may become concave, potentially making accurate inner diameter measurement difficult. However, in this invention, since magnetic force is used to connect the cylindrical battery box to the fixing unit, the risk of deforming the appearance of the cylindrical battery box can be reduced.

[0055] To determine whether the inner diameter of the cylindrical battery box 10 meets the specifications, the following procedure is performed: the inner diameter measuring unit 410 is inserted into the cylindrical battery box 10, which is fixed to the fixing unit 100. At this time, the force required to insert the inner diameter measuring unit 410 into the cylindrical battery box 10 is measured by the pressure measuring unit 420.

[0056] In order to insert the inner diameter measuring unit 410 and the pressure measuring unit 420 into the cylindrical battery box 10, the cylindrical battery box inspection device according to the present invention further includes a moving unit 500, which is configured to move the measuring unit 400, which is composed of the inner diameter measuring unit 410 and the pressure measuring unit 420, up and down.

[0057] The structure of the moving unit 500 is not particularly limited, as long as the moving unit can be deformed to increase or decrease its length, or the moving unit can be connected to a separate moving device to allow the moving unit to move up and down.

[0058] Figure 1 The left side of the figure shows the standby state before the inner diameter of the cylindrical battery box is measured, with the measuring unit 400 positioned in contact with the bracket 300. Figure 1 The right side of the figure shows that when the movable unit 500, which is connected to the bottom of the pressure measuring unit 420, extends, the entire measuring unit 400 moves upward, causing the upper end of the measuring unit 400 to be inserted into the cylindrical battery box 10 until it is inserted into the bottom of the cylindrical battery box 10.

[0059] Therefore, the measuring unit 400 is configured to measure the inner diameter of the cylindrical battery box 10 while it is being inserted. The central axis of the inner diameter measuring unit 410 is aligned with the central axis of the cylindrical battery box 10.

[0060] The inner diameter measuring unit 410 can be constructed as a cylinder with a specific diameter, and the height of the inner diameter measuring unit 410 can be constructed to be greater than the height of the cylindrical battery box to be measured.

[0061] The inner diameter measuring unit 410 may include both of the following: a go gauge, which is constructed in a cylindrical form with a diameter of a certain size at which a cylindrical battery box can be identified as a qualified product; and a no-go gauge, which is constructed in a cylindrical form with a diameter too large to be inserted into a cylindrical battery box, and the inner diameter measuring unit 410 may be configured to be able to connect to the pressure measuring unit 420 and to be able to disconnect from the pressure measuring unit.

[0062] Therefore, in Figure 1 In the case shown, each of the go gauge of the inner diameter measuring unit and the no-go gauge of the inner diameter measuring unit can be connected to a single pressure measuring unit 420.

[0063] For example, firstly, a no-go gauge, serving as the inner diameter measuring unit, can be installed onto the pressure measuring unit 420. The measuring unit 400 can move upwards to determine whether the measuring unit is inserted into the cylindrical battery box 10. The measuring unit 400 can also move downwards to a standby state before the upward movement, and the no-go gauge can be separated from the pressure measuring unit 420. After the go gauge, serving as the inner diameter measuring unit, is installed onto the pressure measuring unit 420, the measuring unit 400 moves upwards to determine whether the measuring unit is inserted into the cylindrical battery box 10. At this time, the pressure value measured by the pressure measuring unit 420 can be checked to determine whether the cylindrical battery box is defective.

[0064] In other words, when the GO gauge is inserted into the cylindrical battery box 10, if there is no predetermined gap between the outer surface of the GO gauge and the inner surface of the cylindrical battery box 10 and therefore the force required to insert the GO gauge is too large, the wound electrode assembly may be damaged when inserted into the cylindrical battery box, and therefore the cylindrical battery box can be classified as defective.

[0065] The pressure measuring unit 420 may be composed of a load sensor, which may be configured such that when the inner diameter measuring unit 410 is inserted into the cylindrical battery box 10, the pressure exerted by the inner diameter measuring unit 410 on the pressure measuring unit 420 is measured.

[0066] Additionally, whenever a go gauge or no-go gauge is connected to the pressure measuring unit, the pressure measuring unit can measure the inner diameter of the cylindrical battery box after the pressure is set to zero.

[0067] The cylindrical battery box inspection method described above is equally applicable to all embodiments of the cylindrical battery box inspection equipment included in this invention.

[0068] Figure 2 This is a perspective view of the cylindrical battery box inspection device according to the second embodiment.

[0069] Reference Figure 2The cylindrical battery box inspection device according to the second embodiment differs from the cylindrical battery box inspection device according to the first embodiment in that the support member 200 includes an upper portion 210 and a lower portion 220 configured to be separate from each other. Specifically, the support member 200 includes an upper portion 210 connected to the fixing unit 100 and a lower portion 220 connected to the bracket 300, wherein the upper portion 210 can be separated from the lower portion 220 connected to the bracket 300 so as to be replaced by another upper portion.

[0070] Typically, standard cylindrical battery cases are suitable for cylindrical battery cells, such as 18650, 21700, or 4680 battery cells. To stably attach the cylindrical battery case to the mounting unit, it is necessary to increase the contact surface area between the connecting surface of the mounting unit and the cylindrical side surface of the cylindrical battery case. In particular, as in this invention, when using magnetic force to attach the cylindrical battery case to the mounting unit, it is advantageous to ensure a large contact surface area between the cylindrical battery case and the mounting unit to maintain a stable attachment of the cylindrical battery case.

[0071] Therefore, preferably, the radius of curvature of the connecting surface of the fixing unit is equal to or similar to the radius of curvature of the cylindrical side surface of the cylindrical battery box. Thus, in this invention, a fixing unit whose dimensions match those of the cylindrical battery box is selectively used to measure the inner diameter of the cylindrical battery box.

[0072] In other words, the fixing unit 100 connected to the upper portion 210 of the support member 200 may have a connecting surface 101, the radius of curvature of which is the same as or similar to the radius of curvature of the cylindrical side surface of the 18650 battery cell, 21700 battery cell, or 4680 battery cell. Therefore, the fixing unit 100—having a connecting surface that matches the dimensions of the cylindrical battery box—is connected to the upper portion 210 of the support member 200, which can be connected to the lower portion 220, and the inner diameter of the cylindrical battery box can be inspected, wherein the upper portion 210 is attached to the fixing unit 100 that matches the inner diameter of the cylindrical battery box to be measured.

[0073] Figure 3 This is a perspective view showing the inner diameter measuring unit and the pressure measuring unit connected to each other in a cylindrical battery box inspection device according to the present invention.

[0074] Reference Figure 3The pressure measuring unit 420 shown in (a) has a downwardly recessed recess 421 formed therein, wherein the lower end of the inner diameter measuring unit 410 can be inserted into and fixed to the recess 421. In the configuration shown in (a), a pressure measuring unit 420 with a recess 421 may be required, the recess 421 being configured to receive inner diameter measuring units 410 of various outer diameter sizes. The pressure measuring unit 420 shown in (b) includes a male threaded portion 422 protruding from its upper surface, and the inner diameter measuring unit 410 has a female threaded portion 412 provided at its lower surface 411, the female threaded portion 412 being formed to be inwardly recessed and corresponding to the male threaded portion 422, wherein the male threaded portion 422 and the female threaded portion 412 can be connected to each other by screw fastening. In the configuration shown in (b), even if the outer diameter of the inner diameter measuring unit 410 changes, if the size of the female thread portion 412 formed at the lower surface of the inner diameter measuring unit is constant, multiple inner diameter measuring units 410 can be used interchangeably for a single pressure measuring unit 420.

[0075] Figure 4 This is a perspective view of a cylindrical battery box inspection device according to the third embodiment.

[0076] Reference Figure 4 When comparing the cylindrical battery box inspection device according to the third embodiment with the cylindrical battery box inspection device according to the first embodiment, the pressure measuring unit includes a first pressure measuring part 420a and a second pressure measuring part 420b, and the inner diameter measuring unit includes a first inner diameter measuring part 410a and a second inner diameter measuring part 410b. The first pressure measuring part 420a is connected to the lower end of the first inner diameter measuring part 410a, the second pressure measuring part 420b is connected to the lower end of the second inner diameter measuring part 410b, and the first pressure measuring part 420a and the second pressure measuring part 420b are connected to the moving unit 500.

[0077] The moving unit 500 includes a flat portion 510 parallel to the upper surface of the support 300 and a deformable portion 520 connected to the flat portion 510, the deformable portion having an increased or decreased length to allow the flat portion 510 to move in the vertical direction.

[0078] A rotating body 600, capable of rotating on the support 300, is attached to the bottom of the moving unit 500, wherein the rotating body 600 rotates with its flat surface parallel to the flat portion of the support 300. The rotation of the rotating body 600 causes one of the first measuring portion (composed of the first inner diameter measuring portion 410a and the first pressure measuring portion 420a) and the second measuring portion (composed of the second inner diameter measuring portion 410b and the second pressure measuring portion 420b) to be located below the cylindrical battery box 10 connected to the fixed unit 100. When the first measuring portion or the second measuring portion is located below the cylindrical battery box 10, the deformable portion 520 extends, and the first inner diameter measuring portion 410a or the second inner diameter measuring portion 410b moves upward toward the interior of the cylindrical battery box 10.

[0079] One of the first inner diameter measuring part 410a and the second inner diameter measuring part 410b can be a go gauge and the other can be a no-go gauge.

[0080] Even according to Figure 4 In the cylindrical battery box inspection device of the third embodiment shown, each of the first inner diameter measuring part 410a and the second inner diameter measuring part 410b can be connected to and separated from a corresponding part of the second pressure measuring part 420a and the second pressure measuring part 420b, such as... Figure 3 As shown in (a) and (b). Therefore, the go gauge and no-go gauge can be connected and used interchangeably according to the dimensions of the cylindrical battery box.

[0081] Figure 5 This is a perspective view of a cylindrical battery box inspection device according to the fourth embodiment.

[0082] Reference Figure 5 The cylindrical battery box inspection device according to the fourth embodiment differs from the cylindrical battery box inspection device according to the first embodiment in that the fixing unit is composed of a second fixing part 120 connected to the circular bottom of the cylindrical battery box 10.

[0083] In the cylindrical battery box inspection device according to the first embodiment, the fixing unit 100 includes a first fixing portion 110, which is configured to have a curved shape corresponding to the cylindrical side surface, such as... Figure 6 As shown. Figure 5 The second fixing portion 120 shown can be constructed as a flat circular shape or a low-height cylindrical shape, and the lower surface of the second fixing portion 120 can be positioned parallel to the upper surface of the bracket 300. Therefore, when the cylindrical battery box 10 is connected to the second fixing portion 120, the central axis of the cylindrical battery box 10 can be perpendicular to the bracket 300.

[0084] Magnetic material can be added to the connecting surface of the second fixing part 120 that is connected to the bottom surface of the cylindrical battery box 10, thereby allowing the cylindrical battery box 10 and the second fixing part 120 to be connected to each other by magnetic force.

[0085] When the second fixing part 120 is configured as a fixing unit, the following advantages exist: the second fixing part does not need to be replaced according to the size of the cylindrical battery box.

[0086] Even in Figure 5 In the cylindrical battery box inspection device according to the fourth embodiment shown, the inner diameter measuring unit 410 can also be replaced by a first inner diameter measuring part 410a and a second inner diameter measuring part 410b, and the pressure measuring unit 420 can be replaced by a first pressure measuring part 420a and a second pressure measuring part 420b. Each of the first inner diameter measuring part 410a and the second inner diameter measuring part 410b can be connected to and separated from a corresponding one of the first pressure measuring part 420a and the second pressure measuring part 420b, such as... Figure 3 As shown in (a) and (b). Therefore, the go gauge and no-go gauge can be connected and used interchangeably according to the dimensions of the cylindrical battery box.

[0087] Figure 6 This is a perspective view of a cylindrical battery box inspection device according to the fifth embodiment.

[0088] Reference Figure 6 The difference between the cylindrical battery box inspection device according to the fifth embodiment and the cylindrical battery box inspection device according to the first embodiment is that the fixing unit 100 includes: a first fixing portion 110, which is configured to have a curved shape corresponding to the cylindrical side surface of the cylindrical battery box 10; and a second fixing portion 120, which is connected to the circular bottom of the cylindrical battery box 10.

[0089] Magnetic material can be added to the connection surface of the fixing unit 100, which includes a first fixing portion 110 and a second fixing portion 120, which is connected to the cylindrical battery box 10, thereby allowing the fixing unit 100 and the cylindrical battery box 10 to be connected to each other by magnetic force.

[0090] As described above, when a fixing unit 100 including a first fixing portion 110 and a second fixing portion 120 is used, a wide connection surface between the fixing unit 100 and the cylindrical battery box 10 can be ensured, thereby enabling stable fixing of the cylindrical battery box 10.

[0091] Even in Figure 6In the cylindrical battery box inspection device according to the fifth embodiment shown, the inner diameter measuring unit 410 can also be replaced by a first inner diameter measuring part 410a and a second inner diameter measuring part 410b, and the pressure measuring unit 420 can be replaced by a first pressure measuring part 420a and a second pressure measuring part 420b. Each of the first inner diameter measuring part 410a and the second inner diameter measuring part 410b can be connected to a corresponding one of the first pressure measuring part 420a and the second pressure measuring part 420b, and can also be separated from said corresponding one. Figure 3 As shown in (a) and (b). Therefore, the go gauge and no-go gauge can be connected and used interchangeably according to the dimensions of the cylindrical battery box.

[0092] Those skilled in the art will recognize that, based on the above description, various applications and modifications are possible within the scope of this invention.

[0093] (Description of reference numerals in the attached figures)

[0094] 10: Cylindrical battery box

[0095] 100: Fixed Unit

[0096] 101: Connecting Surface

[0097] 110: First fixed part

[0098] 120: Second fixed part

[0099] 200: Supporting component

[0100] 210: Upper part

[0101] 220: Lower part

[0102] 300: Bracket

[0103] 400: Measurement Unit

[0104] 410: Inner Diameter Measurement Unit

[0105] 410a: First inner diameter measuring section

[0106] 410b: Second inner diameter measuring section

[0107] 411: Lower surface

[0108] 412: Female thread portion

[0109] 420: Pressure Measurement Unit

[0110] 420a: First pressure measurement section

[0111] 420b: Second pressure measurement section

[0112] 421: concave part

[0113] 422: Male thread section

[0114] 500: Moving Unit

[0115] 510: Flat section

[0116] 520: Deformation Part

[0117] 600: Rotating Body

Claims

1. A cylindrical battery box inspection device, comprising: A fixing unit, wherein the fixing unit is configured to fix a cylindrical battery box; A support member is attached to the fixing unit to support the fixing unit; A bracket, wherein the supporting member is connected to the bracket; An inner diameter measuring unit is configured to measure the inner diameter of the cylindrical battery box. as well as A pressure measuring unit is connected to the bottom of the inner diameter measuring unit.

2. The cylindrical battery box inspection device according to claim 1 further includes a moving unit, the moving unit being configured to move the measuring unit, which is composed of the inner diameter measuring unit and the pressure measuring unit, up and down.

3. The cylindrical battery box inspection device according to claim 1, wherein, The support member includes an upper portion connected to the fixing unit and a lower portion connected to the bracket, and The upper portion is configured to be able to connect to the lower portion and to be detached from the lower portion.

4. The cylindrical battery box inspection device according to claim 1, wherein, The inner diameter measuring unit is configured to be able to be connected to the pressure measuring unit and to be detached from the pressure measuring unit.

5. The cylindrical battery box inspection device according to claim 4, wherein, The pressure measuring unit includes a recess configured to receive the lower end of the inner diameter measuring unit, and The lower end of the inner diameter measuring unit is inserted into the recess and fixed to the recess.

6. The cylindrical battery box inspection device according to claim 4, wherein, The pressure measuring unit includes a male threaded portion protruding from the upper surface of the pressure measuring unit. The inner diameter measuring unit has a female thread portion on its lower surface, the female thread portion being recessed inward and corresponding to the male thread portion, and The male threaded portion and the female threaded portion are connected to each other by a helical fastening.

7. The cylindrical battery box inspection device according to claim 2, wherein, The pressure measurement unit includes a first pressure measurement section and a second pressure measurement section. The inner diameter measuring unit includes a first inner diameter measuring part and a second inner diameter measuring part. The first pressure measuring part is connected to the lower end of the first inner diameter measuring part, and the second pressure measuring part is connected to the lower end of the second inner diameter measuring part. The first pressure measuring part and the second pressure measuring part are connected to the moving unit, and A rotating body capable of rotating on the support is attached to the bottom of the moving unit.

8. The cylindrical battery box inspection device according to claim 1, wherein, The fixing unit includes a first fixing portion, which is configured to have a curved shape corresponding to the cylindrical side surface of the cylindrical battery box.

9. The cylindrical battery box inspection device according to claim 1, wherein, The fixing unit includes a second fixing part, which is connected to the circular bottom of the cylindrical battery box.

10. The cylindrical battery box inspection device according to claim 1, wherein, The fixing unit includes: A first fixing portion, the first fixing portion being configured to have a curved shape corresponding to the cylindrical side surface of the cylindrical battery box; and The second fixing part is connected to the circular bottom of the cylindrical battery box.

11. The cylindrical battery box inspection device according to claim 1, wherein, The connecting surface of the fixing unit to the cylindrical battery box is provided with a magnetic material, which is configured to allow the fixing unit and the cylindrical battery box to be connected to each other due to the magnetic material.

12. The cylindrical battery box inspection device according to claim 1, wherein, The inner diameter measuring unit includes a go gauge and a no-go gauge.

13. The cylindrical battery box inspection device according to claim 12, wherein, Whenever the go gauge or the no-go gauge is connected to the pressure measuring unit, the pressure of the pressure measuring unit is set to zero.

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