Device for inspecting cylindrical battery case

Abstract

The present invention relates to a device for inspecting a cylindrical battery case, comprising: a fixing unit that fixes a cylindrical battery case; a support member attached to the fixing unit so as to support the fixing unit; a stand to which the support member is coupled; an inner diameter measuring unit that measures the inner diameter of the cylindrical battery case; and a pressure measuring unit coupled to a lower portion of the inner diameter measuring unit, wherein a measuring unit including the inner diameter measuring unit and the pressure measuring unit moves so as to be inserted into the cylindrical battery case while the cylindrical battery case is fixed to the fixing unit, thereby enabling inspection of whether the inner diameter of the cylindrical battery case is within an appropriate range.

Description

Cylindrical battery case inspection device

[0001] This application claims the benefit of priority to Korean Patent Application No. 2024-0086876, filed July 2, 2024, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a cylindrical battery case inspection device. Specifically, the invention relates to a cylindrical battery case inspection device capable of measuring not only whether an inner diameter measuring part is inserted into the cylindrical battery case when measuring the inner diameter of the cylindrical battery case, but also the magnitude of force applied when the inner diameter measuring part is inserted.

[0003]

[0004] Lithium secondary batteries can be classified according to the material and shape of the battery case in which the electrode assembly is built. Specifically, they are classified into cylindrical or square batteries in which the electrode assembly is built into a battery case made of a metal material and formed into a cylindrical or square shape, and pouch-type batteries in which the electrode assembly is built into a pouch-type case manufactured by molding an aluminum laminate sheet. Among them, cylindrical batteries have the advantages of relatively large capacity and structural safety.

[0005] Typically, cylindrical batteries are manufactured by placing and sealing a jelly-roll-shaped electrode assembly in a cylindrical battery case with a separator sheet interposed between the positive and negative electrode sheets.

[0006] If the inner diameter of the cylindrical battery case is too large compared to the diameter of the jelly-roll type electrode assembly, the wound state of the jelly-roll type electrode assembly may become loose, and unnecessary waste may occur inside the cylindrical battery case, which is not appropriate. In addition, if the inner diameter of the cylindrical battery case is almost similar to the diameter of the jelly-roll type electrode assembly, the jelly-roll type electrode assembly may be damaged during the process of inserting the jelly-roll type electrode assembly into the cylindrical battery case, which may cause problems in the subsequent process.

[0007] Accordingly, in order to check whether the diameter of the cylindrical battery case is appropriate during the cylindrical battery manufacturing process, an inspection device called Go Gauge and Nogo Gauge, which are cylindrical inspection devices with a constant diameter, can be used. Specifically, a worker manually inserts a cylindrical battery case into the Go Gauge and Nogo Gauge to check whether the cylindrical battery case is inserted. At this time, there are precautions such as not to forcefully insert the cylindrical battery case by pressing the bottom of the cylindrical battery case, not to insert the cylindrical battery case by dropping it in the air, and to insert it only to a certain depth from the end of the cylindrical battery case. However, since the inspection is performed manually by the worker, there are problems such as the size of the force required for insertion may vary, or there may be differences in the insertion depth, making it difficult to maintain constant inspection conditions.

[0008] The above Go Gauge and Nogo Gauge are configured with different inner diameters, so when a cylindrical battery case is inserted into the Go Gauge, it can be judged as a good product, and when it is inserted into the Nogo Gauge, it can be judged as a defective product. However, even when the cylindrical battery case is inserted into the Go Gauge, if the pressing force to insert the cylindrical battery case exceeds a certain level, it needs to be processed as a defective product.

[0009] If the inner diameter of the cylindrical battery case is larger than the outer diameter of the jelly-roll electrode assembly but is configured to be of a similar size, the jelly-roll electrode assembly may be damaged when inserted into the cylindrical battery case because it is inserted too tightly. In such a case, the cylindrical battery case should be treated as defective.

[0010] Therefore, when performing an inspection to measure the inner diameter of a cylindrical battery case, it is necessary to simultaneously measure the pressure applied to the inspection device inserted into the cylindrical battery case.

[0011] Patent Document 1 relates to a measuring device and a measuring method that can easily and precisely measure the outer diameter and inner diameter of a cylindrical member. The cylindrical member is placed at a measurement position and the outer diameter and inner diameter of the cylindrical member can be measured, but the size of the force required when inserting another part into the cylindrical member cannot be measured.

[0012] Patent document 2 is a measuring device for a cylindrical battery cell that measures the processed shape of a cylindrical can, and is configured with a structure that measures and displays at least one selected from the group consisting of the height of a beading portion and the height of a crimping portion in a cylindrical can in which a beading portion and a crimping portion are formed.

[0013] The cylindrical battery cell measuring device of Patent Document 2 relates to a device for measuring at least one of the height of a beading portion and the height of a crimping portion in a cylindrical can in which a beading portion and / or a crimping portion are already formed, and therefore does not present a method for determining the magnitude of force required when inserting a jelly-roll type electrode assembly into a cylindrical battery case.

[0014] Therefore, a technology is needed to determine whether the inner diameter of the cylindrical battery case is a size that allows the jelly-roll electrode assembly to be inserted without damage by simultaneously measuring the pressure applied when the jelly-roll electrode assembly is inserted into the cylindrical battery case while measuring the inner diameter of the cylindrical battery case.

[0015]

[0016] (Prior art literature)

[0017] (Patent Document 1) Japanese Patent Publication No. 2017-146188 (August 24, 2017)

[0018] (Patent Document 2) Korean Patent Publication No. 2012-0010319 (February 3, 2012)

[0019]

[0020] The present invention is intended to solve the above-mentioned problem, and aims to provide a cylindrical battery case inspection device capable of simultaneously measuring the inner diameter of a cylindrical battery case and checking the pressure applied when a jelly-roll type electrode assembly is inserted into the cylindrical battery case.

[0021]

[0022] To achieve this purpose, a cylindrical battery case inspection device according to the present invention may include a fixing part for fixing a cylindrical battery case, a support member attached to the fixing part to support the fixing part, a stand to which the support member is coupled, an inner diameter measuring part for measuring the inner diameter of the cylindrical battery case, and a pressure measuring part coupled to a lower portion of the inner diameter measuring part.

[0023] The measuring unit may further include a moving unit for moving up and down the measuring unit in which the inner diameter measuring unit and the pressure measuring unit are combined.

[0024] The above support member includes an upper part to which the fixing part is coupled, and a lower part coupled to the stand, and the upper part can be configured in a form that can be coupled to and separated from the lower part.

[0025] The above inner diameter measuring unit may be of a form that can be combined and separated with respect to the pressure measuring unit.

[0026] The pressure measuring unit includes a groove in which the lower end of the inner diameter measuring unit is received, and the lower end of the inner diameter measuring unit can be inserted and fixed within the groove.

[0027] The pressure measuring unit includes a male screw portion protruding from the upper surface, and a female screw portion that is concave inward and corresponds to the male screw portion is formed on the lower surface of the inner diameter measuring unit, and the male screw portion and the female screw portion can be connected by a screw fastening method.

[0028] The pressure measuring unit includes a first pressure measuring unit and a second pressure measuring unit, the inner diameter measuring unit includes a first inner diameter measuring unit and a second inner diameter measuring unit, the first pressure measuring unit is coupled to a lower end of the first inner diameter measuring unit, the second pressure measuring unit is coupled to a lower end of the second inner diameter measuring unit, the first pressure measuring unit and the second pressure measuring unit are coupled to the moving unit, and a rotating body rotatable on the stand can be attached to a lower end of the moving unit.

[0029] The above-mentioned fixing part may include a first fixing part configured in a curved shape corresponding to the cylindrical side of the cylindrical battery case.

[0030] The above-mentioned fixing member may include a second fixing member that is coupled to the circular bottom of the cylindrical battery case.

[0031] The above-mentioned fixing part may include a first fixing part configured in a curved shape corresponding to the cylindrical side of the cylindrical battery case, and a second fixing part coupled to the circular bottom of the cylindrical battery case.

[0032] The bonding surface that is bonded to the cylindrical battery case in the above-mentioned fixed portion may have a magnetic material added thereto to which the cylindrical battery case can be bonded.

[0033] The above inner diameter measuring unit may include a go gauge and a nogo gauge.

[0034] The above pressure measuring unit can set the pressure magnitude to 0 whenever the high gauge or the low gauge is respectively combined.

[0035]

[0036] The present invention can also be provided in a form in which various means for solving the above problem are combined.

[0037]

[0038] According to the present invention, when a cylindrical battery case inspection device is inserted into the cylindrical battery case, it is possible to check whether the inner diameter of the cylindrical battery case is a size that meets the standard through an inner diameter measuring unit, and also to measure the pressure applied to the cylindrical battery case inspection device through a pressure measuring unit.

[0039] Based on the pressure value measured in this way, even if the inner diameter of the cylindrical battery case is a size that meets the standard, it can be determined whether the cylindrical battery case is an inappropriate size for inserting the jelly-roll type electrode assembly.

[0040]

[0041] Fig. 1 is a perspective view of a cylindrical battery case inspection device according to the first embodiment.

[0042] Figure 2 is a perspective view of a cylindrical battery case inspection device according to a second embodiment.

[0043] Figure 3 is a perspective view showing the form in which the inner diameter measuring unit and the pressure measuring unit are combined in the cylindrical battery case inspection device according to the present invention.

[0044] Fig. 4 is a perspective view of a cylindrical battery case inspection device according to a third embodiment.

[0045] Fig. 5 is a perspective view of a cylindrical battery case inspection device according to the fourth embodiment.

[0046] Fig. 6 is a perspective view of a cylindrical battery case inspection device according to the fifth embodiment.

[0047]

[0048] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those skilled in the art can easily implement the present invention. When describing the operating principles of the embodiments of the present invention in detail, detailed descriptions of known functions or components will be omitted if they are deemed to unnecessarily obscure the gist of the present invention.

[0049] Parts with similar functions and actions are designated by the same drawing reference numerals throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless otherwise specifically stated, but rather implies the inclusion of additional components.

[0050] The description that concretizes or adds to the components may be applied to all inventions unless there is a special limitation, and is not limited to the description of a specific invention.

[0051] Throughout the description and claims of the invention herein, the singular includes the plural unless otherwise stated.

[0052] Throughout the description and claims of the present invention, the term "or" includes "and" unless otherwise stated. Therefore, "comprising A or B" means all three cases of including A, including B, or including A and B.

[0053] The present invention is described in detail with examples according to the drawings.

[0054] A cylindrical battery case inspection device according to the present invention is a device for measuring the inner diameter of a cylindrical battery case in which a beading portion and / or a crimping portion is not formed on the cylindrical battery case, the upper surface of which is open and is configured with a circular bottom and a cylindrical side surface, and the inner diameter of the cylindrical side surface is configured to be a constant size throughout the side surface.

[0055] When directly inserting a jelly-roll type electrode assembly into a cylindrical battery case to check whether the inner diameter of the cylindrical battery case is appropriate, the jelly-roll type electrode assembly may be damaged due to a defective cylindrical battery case, so the suitability of the cylindrical battery case can be confirmed by inserting an inner diameter measuring part instead of the jelly-roll type electrode assembly into the inside of the cylindrical battery case.

[0056] Fig. 1 is a perspective view of a cylindrical battery case inspection device according to the first embodiment.

[0057] Referring to FIG. 1, a cylindrical battery case inspection device according to the present invention includes a fixing member (100) for fixing a cylindrical battery case (10), a support member (200) attached to the fixing member (100) to support the fixing member (100), a stand (300) to which the support member (200) is coupled, an inner diameter measuring member (410) for measuring the inner diameter of the cylindrical battery case (10), and a pressure measuring member (420) coupled to the lower portion of the inner diameter measuring member (410).

[0058] A cylindrical battery case (10) is fixed to a fixing member (100) with its open upper surface facing downward. A rod-shaped support member (200) is attached to the fixing member (100), and the support member (200) is coupled to the stand (300) so that its longitudinal axis is perpendicular to the upper surface of the stand (300), and the fixing member (100) is spaced apart from the stand (300) at a constant interval via the support member (200).

[0059] In one specific example, a magnetic material may be added to the joining surface (101) of the fixing member (100) to which the cylindrical battery case (10) is joined, so that the cylindrical battery case (10) and the fixing member (100) may be joined by magnetic force. In contrast, when the cylindrical battery case is fixed using a tool such as a gripper, the cylindrical battery case may be distorted, making it difficult to accurately measure the inner diameter. However, since the present invention uses magnetic force to join the cylindrical battery case to the fixing member, the risk of the exterior of the cylindrical battery case being deformed can be reduced.

[0060] In order to check whether the inner diameter of the cylindrical battery case (10) meets the standard, a process of inserting an inner diameter measuring part (410) into the interior of the cylindrical battery case (10) fixed to the fixing part (100) is performed, and at this time, the amount of force required when the inner diameter measuring part (410) is inserted into the cylindrical battery case (10) is measured through the pressure measuring part (420).

[0061] In this way, in order to insert the inner diameter measuring unit (410) and the pressure measuring unit (420) into the cylindrical battery case (10), a moving unit (500) for moving up and down the measuring unit (400) in which the inner diameter measuring unit (410) and the pressure measuring unit (420) are combined is further included.

[0062] The moving part (500) may be formed in a form that can be deformed to increase or decrease in length by itself, or may be formed in a form that can be combined with a separate moving means to move in an up and down direction, and its structure is not particularly limited.

[0063] The left drawing of Fig. 1 shows a standby state before starting to measure the inner diameter of a cylindrical battery case, in which the measuring unit (400) is positioned so as to be in contact with the stand (300). The right drawing of Fig. 1 shows a state in which the entire measuring unit (400) moves upward as the moving unit (500) coupled to the lower portion of the pressure measuring unit (420) extends, such that the upper end of the measuring unit (400) is inserted to the bottom of the cylindrical battery case (10).

[0064] In this way, the measuring unit (400) is configured to measure the inner diameter while being inserted into the cylindrical battery case (10), and the central axis of the inner diameter measuring unit (410) is configured to coincide with the central axis of the cylindrical battery case (10).

[0065] The inner diameter measuring unit (410) may be configured in a cylindrical shape with a diameter of a certain size, and the height of the inner diameter measuring unit (410) may be configured to be greater than the height of the cylindrical battery case to be measured.

[0066] The inner diameter measuring unit (410) may include a go gauge formed in a cylindrical shape with a diameter that allows the cylindrical battery case to be recognized as a good product, and a nogo gauge formed in a cylindrical shape with a diameter that does not allow the cylindrical battery case to be inserted, and the inner diameter measuring unit (410) may be configured in a form that can be combined with and separated from the pressure measuring unit (420).

[0067] Therefore, in a case such as FIG. 1, a high-gauge inner diameter measuring unit and a low-gauge inner diameter measuring unit can be respectively combined in one pressure measuring unit (420).

[0068] For example, first, a no-go gauge can be mounted as an inner diameter measuring unit on the pressure measuring unit (420), and the measuring unit (400) can be moved upward to check whether it is inserted into the cylindrical battery case (10), and then the no-go gauge can be separated from the pressure measuring unit (420) after moving downward so that it is in a standby state before moving the measuring unit (400) upward. After mounting a high gauge as an inner diameter measuring unit on the pressure measuring unit (420), the measuring unit (400) can be moved upward to check whether it is inserted into the cylindrical battery case (10), and at this time, the pressure value measured by the pressure measuring unit (420) can be checked to determine whether the cylindrical battery case is defective.

[0069] That is, when a high gauge is inserted into a cylindrical battery case (10), if there is no predetermined gap between the outer surface of the high gauge and the inner surface of the cylindrical battery case (10), and the force required to insert the high gauge is too large, the jelly-roll type electrode assembly may be damaged when the jelly-roll type electrode assembly is inserted, and thus the cylindrical battery case may be classified as defective.

[0070] The pressure measuring unit (420) may be configured as a load cell, and may be configured in such a way that the pressure applied by the inner diameter measuring unit (410) to the pressure measuring unit (420) is measured when the inner diameter measuring unit (410) is inserted into the cylindrical battery case (10).

[0071] Additionally, the pressure measuring unit can measure the inner diameter of the cylindrical battery case after setting the pressure size to 0 each time the high gauge or the low gauge is combined.

[0072] The cylindrical battery case inspection method described above can be equally applied to all cylindrical battery case inspection device embodiments included in the present invention.

[0073] Figure 2 is a perspective view of a cylindrical battery case inspection device according to a second embodiment.

[0074] Referring to FIG. 2, when comparing the cylindrical battery case inspection device according to the second embodiment with the cylindrical battery case inspection device according to the first embodiment, there is a difference in that the support member (200) includes an upper part (210) and a lower part (220) that are configured to be detachable from each other. Specifically, the support member (200) includes an upper part (210) to which a fixing part (100) is coupled, and a lower part (220) coupled to a stand (300), so that the upper part (210) can be separated from the lower part (220) coupled to the stand (300) and replaced with another upper part.

[0075] Typically, cylindrical battery cells are configured with cylindrical battery cases of standardized sizes, such as 18650 battery cells, 21700 battery cells, or 4680 battery cells. In order to stably fix the cylindrical battery case to a fixing member, it is necessary to increase the contact area between the joining surface of the fixing member and the cylindrical side of the cylindrical battery case. In particular, in the case where the cylindrical battery case is fixed to the fixing member using magnetic force as in the present invention, it is advantageous to secure a wide contact area between the cylindrical battery case and the fixing member in order to maintain a stable attachment state of the cylindrical battery case.

[0076] Therefore, it is preferable that the radius of curvature of the joint surface of the fixing member be equal to or similar to the radius of curvature of the cylindrical side surface of the cylindrical battery case. Accordingly, the present invention is configured to measure the inner diameter of the cylindrical battery case by selectively applying a fixing member that matches the size of the cylindrical battery case.

[0077] That is, the fixing member (100) coupled to the upper end (210) of the support member (200) may have a coupling surface (101) having a radius of curvature that is the same as or similar to the radius of curvature of the cylindrical side of an 18650 battery cell, a 21700 battery cell, or a 4680 battery cell. Accordingly, the fixing member (100) having a coupling surface that matches the size of the cylindrical battery case is coupled to the upper end (210) of the support member (200), and the upper end (210) to which the fixing member (100) that matches the cylindrical battery case, which is the target of inner diameter measurement, is attached is coupled to the lower end (220), and then the inner diameter of the cylindrical battery case can be inspected.

[0078] Figure 3 is a perspective view showing the form in which the inner diameter measuring unit and the pressure measuring unit are combined in the cylindrical battery case inspection device according to the present invention.

[0079] Referring to FIG. 3, the pressure measuring unit (420) illustrated in (a) has a downward concave groove (421) formed therein, and the lower end of the inner diameter measuring unit (410) can be inserted and fixed into the groove (421). In the case of the shape illustrated in (a), a pressure measuring unit (420) having a groove (421) formed to fit various outer diameter sizes of the inner diameter measuring unit (410) may be required. The pressure measuring unit (420) illustrated in (b) includes a male screw portion (422) protruding from the upper surface, and a female screw portion (412) that is concave inward and corresponds to the male screw portion (422) is formed on the lower surface (411) of the inner diameter measuring unit (410), and the male screw portion (422) and the female screw portion (412) can be coupled in a screw fastening manner. In the case of the form shown in (b), if the size of the female screw portion (412) formed on the lower surface is configured to be constant even if the outer diameter of the inner diameter measuring portion (410) changes, it is possible to use multiple inner diameter measuring portions (410) by replacing one pressure measuring portion (420).

[0080] Fig. 4 is a perspective view of a cylindrical battery case inspection device according to a third embodiment.

[0081] Referring to FIG. 4, when comparing the cylindrical battery case inspection device according to the third embodiment with the cylindrical battery case inspection device according to the first embodiment, the pressure measuring unit includes a first pressure measuring unit (420a) and a second pressure measuring unit (420b), the inner diameter measuring unit includes a first inner diameter measuring unit (410a) and a second inner diameter measuring unit (410b), the first pressure measuring unit (420a) is coupled to the lower end of the first inner diameter measuring unit (410a), the second pressure measuring unit (420b) is coupled to the lower end of the second inner diameter measuring unit (410b), and the first pressure measuring unit (420a) and the second pressure measuring unit (420b) are coupled to the moving unit (500).

[0082] The moving part (500) includes a plane (510) parallel to the upper surface of the stand (300), and a deformation part (520) that is coupled to be perpendicular to the plane (510) and whose length increases or decreases to move the plane (510) in the up-and-down direction.

[0083] A rotating body (600) that can rotate on a stand (300) is attached to the lower part of the moving part (500), and the plane of the rotating body (600) rotates while being parallel to the plane of the stand (300). By the rotation of the rotating body (600), either the first measuring unit including the first inner diameter measuring unit (410a) and the first pressure measuring unit (420a), or the second measuring unit including the second inner diameter measuring unit (410b) and the second pressure measuring unit (420b) can be positioned at the lower part of the cylindrical battery case (10) coupled to the fixed part (100). When the first measuring unit or the second measuring unit is positioned at the lower part of the cylindrical battery case (10), the deformation unit (520) is extended, and the first inner diameter measuring unit (410a) or the second inner diameter measuring unit (410b) moves upward toward the inside of the cylindrical battery case (10).

[0084] One of the first inner diameter measuring unit (410a) and the second inner diameter measuring unit (410b) may be a high gauge, and the other may be a low gauge.

[0085] In the case of the cylindrical battery case inspection device according to the third embodiment illustrated in FIG. 4, as shown in (a) and (b) of FIG. 3, each of the first inner diameter measuring unit (410a) and the second inner diameter measuring unit (410b) can be configured in a form that can be combined and separated from the second pressure measuring unit (420a) and the second pressure measuring unit (420b). Accordingly, high and low gauges suitable for the size of the cylindrical battery case can be used by replacing and combining them.

[0086] Fig. 5 is a perspective view of a cylindrical battery case inspection device according to the fourth embodiment.

[0087] Referring to FIG. 5, when comparing the cylindrical battery case inspection device according to the fourth embodiment with the cylindrical battery case inspection device according to the first embodiment, there is a difference in that the fixing part is configured as a second fixing part (120) that is coupled to the circular bottom of the cylindrical battery case (10).

[0088] In the cylindrical battery case inspection device according to the first embodiment, the fixing part (100) is configured in a curved shape corresponding to the cylindrical side surface and includes the first fixing part (110) illustrated in FIG. 6. The second fixing part (120) illustrated in FIG. 5 may be configured in a circular shape in plan view or in a low cylindrical shape, and the lower surface of the second fixing part (120) may be positioned parallel to the upper surface of the stand (300). Therefore, when the cylindrical battery case (10) is coupled to the second fixing part (120), the central axis of the cylindrical battery case (10) may be perpendicular to the stand (300).

[0089] Since the second fixing member (120) can have a magnetic material added to the bonding surface where the bottom surface of the cylindrical battery case (10) is bonded, the cylindrical battery case (10) and the second fixing member (120) can be bonded by magnetic force.

[0090] In the case of having a fixing part of the same form as the second fixing part (120), there is an advantage in that there is no need to replace the second fixing part depending on the size of the cylindrical battery case.

[0091] In the case of the cylindrical battery case inspection device according to the fourth embodiment illustrated in FIG. 5, as in (a) and (b) of FIG. 3, the inner diameter measuring unit (410) can be replaced with a first inner diameter measuring unit (410a) and a second inner diameter measuring unit (410b), and the pressure measuring unit (420) can be replaced with a first pressure measuring unit (420a) and a second pressure measuring unit (420b). Each of the first inner diameter measuring unit (410a) and the second inner diameter measuring unit (410b) can be configured to be combined and separated from the first pressure measuring unit (420a) and the second pressure measuring unit (420b). Therefore, a high gauge and a low gauge suitable for the size of the cylindrical battery case can be replaced and combined for use.

[0092] Fig. 6 is a perspective view of a cylindrical battery case inspection device according to the fifth embodiment.

[0093] Referring to FIG. 6, when comparing the cylindrical battery case inspection device according to the fifth embodiment with the cylindrical battery case inspection device according to the first embodiment, there is a difference in that the fixing part (100) includes a first fixing part (110) configured in a curved shape corresponding to the cylindrical side of the cylindrical battery case (10), and a second fixing part (120) coupled with the circular bottom of the cylindrical battery case (10).

[0094] In the fixing part (100) including the first fixing part (110) and the second fixing part (120), a magnetic material can be added to the bonding surface that is bonded to the cylindrical battery case (10), so that the fixing part (100) and the cylindrical battery case (10) can be bonded by magnetic force.

[0095] By using the fixing part (100) including the first fixing part (110) and the second fixing part (120) in this way, the joining surface between the fixing part (100) and the cylindrical battery case (10) can be secured widely, so that the cylindrical battery case (10) can be stably fixed.

[0096] In the case of the cylindrical battery case inspection device according to the fifth embodiment illustrated in FIG. 6, as in (a) and (b) of FIG. 3, the inner diameter measuring unit (410) can be replaced with a first inner diameter measuring unit (410a) and a second inner diameter measuring unit (410b), and the pressure measuring unit (420) can be replaced with a first pressure measuring unit (420a) and a second pressure measuring unit (420b). Each of the first inner diameter measuring unit (410a) and the second inner diameter measuring unit (410b) can be configured to be combined and separated from the first pressure measuring unit (420a) and the second pressure measuring unit (420b). Therefore, a high gauge and a low gauge suitable for the size of the cylindrical battery case can be replaced and combined for use.

[0097]

[0098] Anyone with ordinary knowledge in the field to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

[0099]

[0100] (Explanation of symbols)

[0101] 10: Cylindrical battery case

[0102] 100: Fixed part

[0103] 101: Bonding surface

[0104] 110: First Fixed Government

[0105] 120: Second Fixed Government

[0106] 200: Absence of support

[0107] 210: Top

[0108] 220: Lower part

[0109] 300: Stand

[0110] 400: Measurement section

[0111] 410: Inner diameter measuring section

[0112] 410a: First inner diameter measuring section

[0113] 410b: Second inner diameter measuring section

[0114] 411: If you do

[0115] 412: Female screw

[0116] 420: Pressure measuring unit

[0117] 420a: First pressure measuring unit

[0118] 420b: Second pressure measuring unit

[0119] 421: Home

[0120] 422: Screw

[0121] 500: Moving parts

[0122] 510: Flat

[0123] 520: Transformation

[0124] 600: Rotor

Claims

1. A fixing member that fixes the cylindrical battery case; A support member attached to the fixed part to support the fixed part; A stand having the above supporting members combined; An inner diameter measuring unit for measuring the inner diameter of the cylindrical battery case; and A pressure measuring unit coupled to the lower portion of the inner diameter measuring unit; A cylindrical battery case inspection device including a .

2. In paragraph 1, A cylindrical battery case inspection device further comprising a moving part for moving up and down a measuring part in which the inner diameter measuring part and the pressure measuring part are combined.

3. In paragraph 1, The above support member includes an upper part to which the fixing part is coupled, and a lower part coupled to the stand, A cylindrical battery case inspection device in which the upper part is configured in a form that can be combined and separated from the lower part.

4. In paragraph 1, A cylindrical battery case inspection device in which the inner diameter measuring unit is capable of being combined and separated from the pressure measuring unit.

5. In paragraph 4, The pressure measuring unit includes a groove portion in which the lower end of the inner diameter measuring unit is received, A cylindrical battery case inspection device in which the lower part of the inner diameter measuring part is inserted and fixed within the above-mentioned home part.

6. In paragraph 4, The above pressure measuring unit includes a male screw portion protruding from the upper surface, The lower surface of the inner diameter measuring part is concave inward and has a female screw portion corresponding to the male screw portion. A cylindrical battery case inspection device in which the above-mentioned male screw portion and the above-mentioned female screw portion are connected by a screw fastening method.

7. In paragraph 2, The above pressure measuring unit includes a first pressure measuring unit and a second pressure measuring unit, The above inner diameter measuring unit includes a first inner diameter measuring unit and a second inner diameter measuring unit, The first pressure measuring unit is coupled to the lower end of the first inner diameter measuring unit, and the second pressure measuring unit is coupled to the lower end of the second inner diameter measuring unit. The first pressure measuring unit and the second pressure measuring unit are coupled to the moving unit, A cylindrical battery case inspection device having a rotating body that can rotate on the stand attached to the lower part of the above-mentioned moving part.

8. In paragraph 1, A cylindrical battery case inspection device including a first fixing part configured in a curved shape corresponding to the cylindrical side of the cylindrical battery case.

9. In paragraph 1, A cylindrical battery case inspection device including a second fixing part that is coupled to the circular bottom of the cylindrical battery case.

10. In paragraph 1, A cylindrical battery case inspection device including a first fixing part configured in a curved shape corresponding to the cylindrical side of the cylindrical battery case, and a second fixing part coupled to the circular bottom of the cylindrical battery case.

11. In paragraph 1, A cylindrical battery case inspection device in which a magnetic material to which the cylindrical battery case can be coupled is added to the bonding surface that is bonded to the cylindrical battery case in the above-mentioned fixed part.

12. In paragraph 1, The above inner diameter measuring unit is a cylindrical battery case inspection device including a go gauge and a nogo gauge.

13. In paragraph 12, The above pressure measuring unit is a cylindrical battery case inspection device that sets the pressure size to 0 whenever the high gauge or the low gauge is respectively combined.

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