Measuring device of breaking pressure for vent cap having hole

Abstract

A breaking pressure measuring device for a vent cap with a hole formed therein according to one embodiment of the present invention is a breaking pressure measuring device used for testing the breaking pressure of a notch of a vent cap in which a hole is formed in the central part and a notch is formed spaced apart from the hole, and comprises: a vent cap fixing part that fixes the edge of the vent cap and supplies compressed air to the central part of the vent cap; and a hole sealing part disposed inside the vent cap fixing part and closing the hole of the vent cap when it moves upward, wherein the hole sealing part includes a sealing holder that closes the hole by applying pressure to the periphery of the hole on the lower surface of the vent cap from the bottom to the top when the hole sealing part moves upward. A breaking pressure measuring device for a vent cap with a hole formed therein according to one embodiment of the present invention is configured so that when testing the breaking pressure of a vent cap, the vent cap is fixed to the vent cap fixing part, and then the hole formed in the vent cap is simply closed using the hole sealing part, and the breaking pressure can be tested, thereby having the effect of reducing the time and cost required for the breaking pressure test.

Description

Technology Field

[0001] The present invention relates to a fracture pressure measuring device, and more specifically, to a fracture pressure measuring device for a vent cap with a hole formed therein, which is used to inspect whether the notch of the vent cap with the hole formed therein fractures at an appropriate fracture pressure. Background Technology

[0003] Rechargeable secondary batteries, which can be reused after charging, consist of a positive electrode, a negative electrode, an electrolyte, and a separator.

[0004] In such secondary batteries, if external factors capable of causing a fire occur, the electrolyte and other components decompose, generating gas. If the generated gas cannot be vented, it causes the separator to decompose, leading to an internal short circuit and thermal runaway. Therefore, a safety device is installed to vent the gas when internal pressure rises due to gas generation.

[0005] In the case of a cylindrical secondary battery, a vent cap with a notch is placed on the upper part of a metal can on which an electrode assembly is seated, so that when the internal pressure rises due to gas generation inside the secondary battery and reaches a predetermined breaking pressure, the notch of the vent cap preemptively breaks to discharge the gas inside the secondary battery. Therefore, the notch formed in the vent cap must be configured to have an accurate shape and depth so that it can break in response to the predetermined breaking pressure.

[0006] Vent caps with such notches undergo a breaking pressure inspection at a certain rate in addition to vision inspection during production.

[0007] As shown in FIG. 2, the fracture pressure test is performed by fixing the vent cap (10) to a fracture pressure test jig (3) to which inert compressed air is supplied, and applying pressure corresponding to the fracture pressure to the vent cap (10) to check whether the notch (13) of the vent cap (10) fractures. In the case of a general vent cap, there is no difficulty in performing the fracture pressure test. However, as shown in FIG. 1, when a hole (11) is formed in the vent cap (10), the hole (11) is closed using a separate plate (1) so that the compressed air supplied to the vent cap (10) for the fracture pressure test is not discharged through the hole (11).

[0008] The closure of the hole (11) of the vent cap (10) is carried out in various ways, but generally, a plate (1) is placed on the upper part of the hole (11) and welded to close the hole (11). When the hole (11) of the vent cap (10) is closed, the vent cap (10) is fixed to a breaking pressure inspection jig (3), and compressed air is supplied until it reaches the breaking pressure to inspect the breaking pressure.

[0009] Therefore, since the hole (11) formed in the vent cap (10) must be closed by separate welding or the like before the fracture pressure test, a lot of time and cost were required for the inspection. Prior art literature

[0011] Republic of Korea Published Patent 10-2006-0028060 (Published March 29, 2006) The problem to be solved

[0012] A breaking pressure measuring device for a vent cap with a hole formed therein according to one embodiment of the present invention aims to reduce the time and cost required for the breaking pressure inspection by allowing the hole formed in the vent cap to be simply closed during the breaking pressure inspection of the vent cap.

[0013] In addition, the fracture pressure measuring device of a vent cap with a hole formed according to one embodiment of the present invention is configured to be reusable so as to reduce the time and cost required for fracture pressure inspection.

[0014] In addition, the breaking pressure measuring device of a vent cap with a hole formed according to one embodiment of the present invention is configured to automatically perform sealing of the hole, thereby saving time and cost. means of solving the problem

[0016] A breaking pressure measuring device for a vent cap with a hole formed therein according to one embodiment of the present invention is a breaking pressure measuring device used for testing the breaking pressure of a notch of a vent cap in which a hole is formed in the central part and a notch is formed spaced apart from the hole, and comprises: a vent cap fixing part that fixes the edge of the vent cap and supplies compressed air to the central part of the vent cap; and a hole sealing part disposed inside the vent cap fixing part and closing the hole of the vent cap when it moves upward, wherein the hole sealing part includes a sealing holder that closes the hole by applying pressure to the periphery of the hole on the lower surface of the vent cap from the bottom to the top when the hole sealing part moves upward.

[0017] A sealing holder of a hole sealing portion of a vent cap with a hole formed therein according to one embodiment of the present invention is composed of a holder body and an extension portion protruding from the upper surface of the holder body, and the extension portion is formed with a cross-section corresponding to the hole of the vent cap, and it is preferable that a holder sealing that presses the hole portion of the lower surface of the vent cap is disposed on the periphery of the extension portion on the upper surface of the holder body.

[0018] In one embodiment of the present invention, the sealing holder of the breaking pressure measuring device of a vent cap with a hole formed therein is preferably inserted movably within a guide that limits the direction of movement of the sealing holder, an elastic body that applies elastic force to the sealing holder when the sealing holder moves is disposed at the lower part of the sealing holder, and a fixed cylinder is disposed at the lower part of the elastic body.

[0019] In one embodiment of the present invention, it is preferable that a sensor for measuring the elastic force of an elastic body be placed in the fixed cylinder of the device for measuring the breaking pressure of a vent cap with a hole formed therein.

[0020] In one embodiment of the present invention, the hole sealing part or the fixing cylinder of the hole sealing part of the breaking pressure measuring device of a vent cap having a hole formed therein moves upward until the elastic force measured by the sensor reaches a preset first value, and the vent cap fixing part supplies compressed air to the center of the vent cap when the elastic force measured by the sensor reaches the first value, and it is preferable that the vent cap fixing part stops the supply of compressed air if the difference between the elastic force measured by the sensor and the previously measured elastic force is greater than or equal to a second value. Effects of the invention

[0022] A breaking pressure measuring device for a vent cap with a hole formed therein according to one embodiment of the present invention is configured so that when testing the breaking pressure of a vent cap, the vent cap is fixed to the vent cap fixing part, and then the hole formed in the vent cap is simply closed using the hole sealing part, and the breaking pressure can be tested, thereby having the effect of reducing the time and cost required for the breaking pressure test.

[0023] In addition, the breaking pressure measuring device of a vent cap with a hole formed therein according to one embodiment of the present invention is configured to detect a pressure change occurring when the notch breaks and to move the hole sealing part so as to separate it from the vent cap, thereby reducing the time and cost required for the breaking pressure inspection. Brief explanation of the drawing

[0025] FIG. 1 is a plan view, a side view, and a cross-sectional view of a vent cap in which the breaking pressure is measured through a breaking pressure measuring device of a vent cap with a hole formed therein according to one embodiment of the present invention. FIG. 2 is a conceptual diagram of the fracture pressure measurement according to the prior art of the vent cap shown in FIG. 1. FIG. 3 is a cross-sectional view of a fracture pressure measuring device of a vent cap with a hole formed therein according to one embodiment of the present invention. FIG. 4 is a conceptual diagram illustrating the fracture pressure measurement step of the fracture pressure measuring device of the vent cap with the hole formed in FIG. 3. Figure 5 is a graph of the elastic force sensed at the sensor of the hole seal in the fracture pressure measurement step shown in Figure 4. Specific details for implementing the invention

[0026] Preferred embodiments according to the present invention will be described in detail with reference to the attached drawings, provided that identical or similar components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0027] Furthermore, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such descriptions could obscure the essence of the invention. Additionally, it should be noted that the attached drawings are intended only to facilitate an understanding of the concept of the present invention and should not be interpreted as limiting the concept of the present invention.

[0029] Hereinafter, a device for measuring the breaking pressure of a vent cap with a hole formed therein according to the present invention will be described in detail with reference to the drawings.

[0031] A device for measuring the breaking pressure of a vent cap with a hole formed therein according to one embodiment of the present invention measures the pressure at the time of breaking of the notch of the vent cap (10) by closing the hole (11) of the vent cap (10) with the hole (11) formed therein as shown in FIG. 3 and then supplying compressed air.

[0032] The breaking pressure measuring device of a vent cap with such a hole formed therein consists of a vent cap fixing part (200) that fixes the vent cap (10) and supplies compressed air, and a hole sealing part (300) that opens and closes the hole (11) of the vent cap (10).

[0033] The vent cap fixing part (200) fixes the edge of the vent cap (10) and is composed of a lower breaking pressure inspection jig (210) on which the lower edge of the vent cap (10) is seated in accordance with the shape of the vent cap (10), and an upper breaking pressure inspection jig (220) on which the upper edge of the vent cap (10) is seated in the lower breaking pressure inspection jig (210).

[0034] A sealing jig (230) is placed on the upper surface of the lower fracture pressure test jig (210) and the lower surface of the upper fracture pressure test jig (220) to prevent air from leaking through the edges of the test jigs (210, 220) and the vent cap (10). Accordingly, the upper surface and lower edge of the vent cap (10) are pressurized through the jig sealing (230) placed on the upper surface of the lower fracture pressure test jig (210) and the lower surface of the upper fracture pressure test jig (220).

[0035] The lower fracture pressure test jig (210) and the upper fracture pressure test jig (220) can both be configured to move up and down, but the fracture pressure measuring device of the vent cap with a hole formed according to the present embodiment is configured such that the upper fracture pressure test jig (220) can move up and down while the lower fracture pressure test jig (210) is fixed.

[0036] The compressed air supply unit of the vent cap fixing part (200) supplies compressed inert air into the lower rupture pressure inspection jig (210), and since a general compressed air supply unit such as a nozzle can be used, a separate explanation for this is omitted.

[0037] The hole sealing portion (300) is positioned on the inner side of the vent cap fixing portion (200) and closes the hole (11) of the vent cap (10) when moved upward. It is composed of a sealing holder (310) that closes the hole (11) by pressing the area around the hole (11) on the lower surface of the vent cap (10) from the bottom upward direction. When the hole sealing portion (300) moves upward, the sealing holder (310) closes the hole (11).

[0039] The sealing holder (310) can be configured in various forms, but in the case of this embodiment, it is composed of a holder body (312) and an extension part (314) as shown in FIG. 2.

[0040] The holder body (312) is formed with an upper surface larger than the area of ​​the hole (11) to close the hole (11), and the upper surface of the holder body (314) presses against the lower surface of the vent cap (10) and the edge of the hole (11) to close the hole (11). An extension (314) is formed in the center of the upper surface of the holder body (312) to penetrate the hole (11). At this time, the extension (314) is formed with a cross-section corresponding to the hole (11), so that when the hole sealing part (300) moves upward, the extension (314) is first inserted into the hole (11) to seal the hole (11), and secondarily, the upper surface of the holder body (312) presses against the lower surface of the vent cap (10) and the edge of the hole (11) to close the hole.

[0041] At this time, a seating groove (312a) is formed on the upper surface of the holder body (312) as shown in the enlarged view of FIG. 3, and a holder sealing (312b) is placed in the seating groove (312a) so that the upper surface of the holder body (312) can more effectively close the hole (11) when pressing the lower surface of the vent cap (10) and the edge of the hole (11).

[0043] The sealing holder (310) is placed within a guide (330) that restricts the direction of movement of the sealing holder (310), so that the sealing holder (310) moves up and down while its direction is constrained by the side (330).

[0044] As shown in FIG. 3, the upper end of the elastic body (320) is connected to the lower end of the sealing holder (310), and a fixing cylinder (340) for fixing the elastic body (320) is disposed at the lower end of the elastic body (320). Thus, when the hole sealing part (300) moves upward and the sealing holder (310) closes the hole (11), the hole (11) is sealed by the elastic force of the elastic body (320).

[0045] In this state, compressed air is supplied through the compressed air supply unit until it reaches a predetermined breaking pressure, thereby checking whether the notch (13) is broken.

[0047] That is, as shown in Fig. 4 (a), a conceptual diagram illustrating the step of measuring the breaking pressure of a vent cap with a hole formed in Fig. 3, when compressed air is supplied as shown in Fig. 4 (b) while the sealing holder (310) is closing the hole of the vent cap (10), the vent cap (10) is deformed in the upward direction by the pressure of the compressed air as shown in Fig. 4 (c). At this time, the elastic body (320) continuously presses the sealing holder (310) in the upward direction to maintain the closed state of the hole (11), and when the pressure of the compressed air reaches the breaking pressure of the notch (13), the notch (13) breaks as shown in Fig. 4 (d).

[0049] Referring to FIG. 3, according to another embodiment of the present invention, a sensor (342) for measuring the elastic force of an elastic body (320) may be placed in the fixed cylinder (340), and the elastic force sensed by the sensor (320) during the process of measuring the breaking pressure will show a value as shown in FIG. 5.

[0050] That is, as shown in (a) of FIG. 4, when the hole sealing part (300) moves upward and the sealing holder (310) comes into contact with the lower surface of the vent cap (10) in which the hole (11) is formed, the elastic body (320) is compressed and the elastic force increases as shown in section (a) of FIG. 5. At this time, since the vent cap (10) may be damaged if the hole sealing part (300) continues to rise, the elastic force in a state where the sealing holder (310) seals the hole (11) and maintains airtightness is set to a first value, and the hole sealing part (300) is raised only until the elastic force measured by the sensor (342) reaches the preset first value.

[0051] When compressed air is supplied in this state, the compressed air deforms the vent cap (10) in an upward direction, and the elastic force sensed by the sensor (342) due to the deformation of the vent cap (10) shows the values ​​of FIG. 5 (b) and FIG. 5 (c). When compressed air is continuously supplied in this state and the pressure of the compressed air reaches the breaking pressure, the notch (13) of the vent cap (10) breaks as shown in FIG. 4 (d), and the compressed air is instantaneously discharged through the broken notch (13). Therefore, the elastic force sensed by the sensor (342) changes instantaneously as shown in FIG. 5 (d). Therefore, the change in elastic force that changes instantaneously when the notch (13) breaks can be set to a second value, and the difference between the elastic force measured by the sensor (342) and the previously measured elastic force can be compared, and if the difference between the two elastic forces is greater than or equal to the second value, it can be determined that the notch (13) has broken and the supply of compressed air can be automatically stopped.

[0052] The hole sealing part (300) employing such an elastic body (320) and a sensor (342) can automatically control the closing of the hole (11) and the supply of compressed air using the elastic force obtained from the sensor (342), but since pressure is applied to the vent cap (10) before the supply of compressed air, it is desirable to consider the pressure applied by the elastic body (320) when calculating the pressure of the compressed air.

[0054] Although the present invention has been described in detail using preferred embodiments, the scope of the invention is not limited to specific embodiments and should be interpreted by the appended claims. Furthermore, those skilled in the art will understand that many modifications and variations are possible without departing from the scope of the invention. Explanation of the symbols

[0056] 1 : Plate 3 : Breaking pressure inspection jig 5 : Compressed air 10 : Vent cap 11 : Hole 13 : Notch 200: Vent cap fixing part 210: Lower breaking pressure inspection jig 220: Upper breaking pressure inspection jig 230: Jig sealing 300: Hole sealing part 310: Sealing holder 312: Holder body 312a: Seating groove 312b: Holder sealing 314: Extension part 320 : Elastomer 330 : Guide 340: Fixed cylinder 342: Sensor

Claims

Claim 1 A fracture pressure measuring device used for testing the fracture pressure of a notch formed at a distance from a hole in a central portion of a vent cap, the device comprising: a vent cap fixing part that fixes the edge of the vent cap and supplies compressed air to the central portion of the vent cap; The vent cap having a hole is characterized by being composed of a hole sealing part disposed on the inner side of the vent cap fixing part and closing the hole of the vent cap when moved upward, wherein the hole sealing part includes a sealing holder that closes the hole by pressing the periphery of the hole on the lower surface of the vent cap from bottom to top when the hole sealing part moves upward, wherein the sealing holder of the hole sealing part is composed of a holder body and an extension part protruding from the upper surface of the holder body, wherein the extension part is formed having a cross-section corresponding to the hole of the vent cap, wherein a holder sealing that presses the periphery of the hole on the lower surface of the vent cap is disposed on the periphery of the extension part on the upper surface of the holder body, wherein the sealing holder is movably inserted within a guide that restricts the direction of movement of the sealing holder, wherein an elastic body that applies elastic force to the sealing holder when the sealing holder moves is disposed on the lower part of the sealing holder, a fixing cylinder is disposed on the lower part of the elastic body, and a sensor that measures the elastic force of the elastic body is disposed on the fixing cylinder. Breaking pressure measuring device. Claim 2 A device for measuring the breaking pressure of a vent cap having a hole formed therein, wherein, in claim 1, the hole sealing part or the fixing cylinder of the hole sealing part moves upward until the elastic force measured by the sensor reaches a preset first value, the vent cap fixing part supplies compressed air to the center of the vent cap when the elastic force measured by the sensor reaches the first value, and if the difference between the elastic force measured by the sensor and the previously measured elastic force is greater than or equal to a second value, the vent cap fixing part stops the supply of compressed air. Claim 3 delete Claim 4 delete Claim 5 delete

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