A housing leak mass spectrometry test mechanism

Abstract

The utility model provides a kind of shell leakage mass spectrum test mechanism, it carries out mass spectrum test to the leakage of shell battery, it reduces the replacement cost of lower mould, and optimizes detection method.It includes: upper mould cover mould, the bottom center is provided with lower convex sealing convexity;Lower mould cavity jig, the upper surface center is provided with lower concave lower cavity, and the communication of lower cavity has vacuum extraction passage, mass spectrum detection passage, nitrogen passage, vacuum extraction passage, mass spectrum detection passage, nitrogen passage extend to the lower surface of lower mould cavity jig;Test valve seat, it includes several upper convex positioning convexity, and corresponding vacuum extraction inlet, mass spectrum detection inlet, nitrogen inlet and outlet, and the periphery side of test valve seat is correspondingly provided with outer convex nitrogen on-off valve, mass spectrum test valve, cavity vacuum valve, and the periphery side of test valve seat is also respectively provided with nitrogen pipeline outer convex joint, mass spectrum test pipeline outer convex joint, cavity vacuum extraction pipeline outer convex joint;And mass spectrum test mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of casing leakage testing, specifically a casing leakage mass spectrometry testing mechanism. Background Technology

[0002] Mass spectrometry is used to detect the total flow rate caused by a leak in the component under test, obtaining a final quantitative measurement value. The aim is to reduce the risk of contaminating the vacuum chamber with large amounts of helium in the event of a severe leak. Current mass spectrometry leak detection methods involve immersing the product under test in helium, allowing helium to permeate into the gaps, and then placing the product in a vacuum chamber for leak detection. In actual testing, multiple sets of tubing need to be integrated into the lower mold for placing the product, making the lower mold structure cumbersome. When different products need to be tested, different lower molds need to be adapted for connection. Since different tubing configurations are required during the manufacturing of the lower mold, replacement costs are high. Furthermore, the need to immerse the product under test in helium throughout the leak detection process also makes the detection relatively cumbersome. Utility Model Content

[0003] To address the aforementioned issues, this invention provides a mass spectrometry testing mechanism for casing leakage, which performs mass spectrometry testing on leakage in the casing battery. This reduces the cost of replacing the lower mold and optimizes the detection method.

[0004] A mass spectrometry testing mechanism for casing leakage, characterized in that it comprises: The upper mold cover has a downward-protruding sealing protrusion at the center of its bottom; The lower mold cavity fixture has a recessed lower cavity at the center of its upper surface. The lower cavity is connected to a vacuum pumping passage, a mass spectrometry detection passage, and a nitrogen gas passage. The vacuum pumping passage, mass spectrometry detection passage, and nitrogen gas passage extend to the lower surface of the lower mold cavity fixture. The lower surface of the lower mold cavity fixture is also provided with several recessed positioning grooves. The test valve seat includes several upwardly protruding positioning protrusions and corresponding vacuum inlet, mass spectrometry detection inlet, and nitrogen inlet / outlet. The four sides of the test valve seat are respectively provided with outwardly protruding nitrogen on / off valve, mass spectrometry test valve, and cavity vacuum valve. The four sides of the test valve seat are also respectively provided with outwardly protruding connectors for nitrogen pipeline, mass spectrometry test pipeline, and cavity vacuum pipeline. The nitrogen on / off valve is used to open or close the nitrogen pipeline, the mass spectrometry test valve is used to open or close the mass spectrometry test pipeline, and the cavity vacuum valve is used to open or close the cavity vacuum pipeline. And a mass spectrometry testing apparatus, which includes a diaphragm pump, a molecular pump, a mass spectrometer, a test vacuum gauge, a mass spectrometry test vacuum gauge, and several test on / off valves; In the test state, the battery casing is placed in the lower cavity, and the convex sealing cover is installed in the upper region of the lower cavity. The diaphragm pump and the mass spectrometer test vacuum gauge are connected to the external connector of the cavity vacuum pipeline through the test on / off valve. The molecular pump and the test vacuum gauge are connected to the external connector of the cavity vacuum pipeline through the test on / off valve. The mass spectrometer is connected to the external connector of the mass spectrometer test pipeline through the test on / off valve. The external connector of the nitrogen pipeline is connected to a nitrogen gas source.

[0005] Its further features are: The vacuuming passage, mass spectrometry detection passage, and nitrogen passage correspond to the central area of ​​the lower surface of the lower mold cavity fixture. The two sets of recessed positioning grooves are arranged on the outer periphery of the central area of ​​the lower surface of the lower mold cavity fixture. The position of the positioning protrusion corresponds to the position of the recessed positioning groove. The positioning protrusion is inserted into the concave positioning groove, and the vacuum inlet is arranged in the vacuum passage, the mass spectrometry detection inlet is arranged in the mass spectrometry detection passage, and the nitrogen inlet / outlet is arranged in the nitrogen passage. The upper part of the upper mold cover is also provided with a drive connecting frame. The top of the drive connecting frame is externally connected to a lifting power mechanism, which drives the drive connecting frame to perform mold opening or closing operations.

[0006] With this invention, the battery casing does not require helium immersion treatment and can be directly placed in the lower cavity. Then, the upper mold cover is installed, causing the lower convex sealing protrusion to conform to the upper region of the lower cavity, thus sealing the battery casing within the lower cavity. The external diaphragm pump draws a vacuum until the mass spectrometer reaches 100 Pa. The molecular pump then continues drawing a vacuum until the mass spectrometer reaches 1E-3 Pa or lower. The mass spectrometer valve opens, and the mass spectrometer detects leakage of the electrolyte inside the battery casing by detecting any molecule or element in the electrolyte. To determine the product leakage level, after the test, the lower cavity is evacuated again and cleaned with nitrogen. Then, the upper mold cover is installed, the mold is opened, and the battery casing is removed. The lower mold cavity fixture and the test valve seat are manufactured independently, so when the lower mold needs to be opened again, only the lower mold cavity fixture needs to be replaced, and the corresponding test valve seat does not need to be replaced. The product leakage level is determined by detecting any molecule or element in the electrolyte, without the need to treat the battery casing with helium. Mass spectrometry testing is performed on the leakage of the battery casing, which reduces the replacement cost of the lower mold and optimizes the detection method. Attached Figure Description

[0007] Figure 1 This is a perspective view of a specific embodiment of the present utility model; Figure 2 This is a perspective view of the upper mold cover mold and the lower mold cavity fixture of this utility model in the mold opening state; Figure 3 This is a perspective view of the test valve seat of this utility model; The names corresponding to the serial numbers in the diagram are as follows: Nitrogen pipeline external protrusion connector 1; mass spectrometry test pipeline external protrusion connector 2; cavity vacuuming pipeline external protrusion connector 3; The components include: upper mold cover mold 10, lower convex sealing protrusion 11, lower mold cavity fixture 20, lower cavity 21, vacuum passage 22, mass spectrometry detection passage 23, nitrogen passage 24, concave positioning groove 25, test valve seat 30, upper convex positioning protrusion 31, vacuum inlet 32, mass spectrometry detection inlet 33, nitrogen inlet / outlet 34, nitrogen on / off valve 35, mass spectrometry test valve 36, cavity vacuum valve 37, mass spectrometry test mechanism 40, diaphragm pump 41, molecular pump 42, mass spectrometer 43, test vacuum gauge 44, mass spectrometry test vacuum gauge 45, test on / off valve 46, and drive connection frame 50. Detailed Implementation

[0008] A mass spectrometry testing mechanism for casing leakage, see Figures 1-3 It includes an upper mold cover mold 10, a lower mold cavity fixture 20, a test valve seat 30, and a mass spectrometry testing mechanism 40; The bottom center of the upper mold cover mold 10 is provided with a downwardly convex sealing protrusion 11; The lower mold cavity fixture 20 has a recessed lower cavity 21 at the center of its upper surface. The lower cavity 21 is connected to a vacuum passage 22, a mass spectrometry detection passage 23, and a nitrogen passage 24. The vacuum passage 22, the mass spectrometry detection passage 23, and the nitrogen passage 24 extend to the lower surface of the lower mold cavity fixture 20. The lower surface of the lower mold cavity fixture 20 is also provided with several recessed positioning grooves 25. The test valve seat 30 includes several upwardly protruding positioning protrusions 31, and corresponding vacuum inlet 32, mass spectrometry detection inlet 33, and nitrogen inlet / outlet 34. The test valve seat 30 is provided with protruding nitrogen on / off valve 35, mass spectrometry test valve 36, and cavity vacuum valve 37 on its four sides. The test valve seat 30 is also provided with protruding nitrogen pipeline connector 1, mass spectrometry test pipeline connector 2, and cavity vacuum pipeline connector 3 on its four sides. The nitrogen on / off valve 35 is used to open or close the nitrogen pipeline, the mass spectrometry test valve 36 is used to open or close the mass spectrometry test pipeline, and the cavity vacuum valve 37 is used to open or close the cavity vacuum pipeline. The mass spectrometry testing mechanism 40 includes a diaphragm pump 41, a molecular pump 42, a mass spectrometer 43, a testing vacuum gauge 44, a mass spectrometry testing vacuum gauge 45, and several testing on / off valves 46. In the test state, the battery casing is placed inside the lower cavity 21, and the lower convex sealing protrusion 11 is fitted with a contoured sealing cover in the upper region of the lower cavity 21. The diaphragm pump 41 and the mass spectrometer test vacuum gauge 45 are connected to the outer protruding connector 3 of the cavity vacuum pipeline through the test on / off valve 46. The molecular pump 42 and the test vacuum gauge 44 are connected to the outer protruding connector 3 of the cavity vacuum pipeline through the test on / off valve 46. The mass spectrometer 43 is connected to the outer protruding connector 2 of the mass spectrometer test pipeline through the test on / off valve 46. The outer protruding connector 1 of the nitrogen pipeline is connected to an external nitrogen source.

[0009] In specific implementation, the vacuuming passage 22, the mass spectrometry detection passage 23, and the nitrogen passage 24 correspond to the central area of ​​the lower surface of the lower mold cavity fixture 20, and the two sets of concave positioning grooves 25 are arranged on the outer periphery of the central area of ​​the lower surface of the lower mold cavity fixture 20. The position of the positioning protrusion 31 corresponds to the position of the concave positioning groove 25. The positioning protrusion 31 is inserted into the concave positioning groove 25 in a contoured manner, and the vacuum inlet 32 ​​is arranged in the vacuum passage 22, the mass spectrometry detection inlet 33 is arranged in the mass spectrometry detection passage 23, and the nitrogen inlet / outlet 34 is arranged in the nitrogen passage 24. The upper part of the upper mold cover mold 10 is also provided with a drive connecting frame 50. The top of the drive connecting frame 50 is connected to a lifting power mechanism, which drives the drive connecting frame 50 to perform mold opening or closing operations.

[0010] Its working principle is as follows: The battery casing does not require helium immersion treatment and is directly placed in the lower cavity. Then, the upper mold cover is installed, causing the lower convex sealing protrusion to conform to the upper region of the lower cavity, thus sealing the battery casing within the lower cavity. The external diaphragm pump draws a vacuum until the mass spectrometer vacuum gauge reaches 100 Pa. The molecular pump then starts to continue drawing a vacuum until the test vacuum gauge reaches 1E-3 Pa or lower. The mass spectrometer test valve opens, and the mass spectrometer detects leakage of the electrolyte inside the battery casing. It determines the leakage by detecting any molecule or element in the electrolyte. To determine the product's leakage level, after testing, the lower cavity is evacuated again and cleaned with nitrogen. Then, the upper mold cover is installed, the mold is opened, and the battery casing is removed. The lower mold cavity fixture and test valve seat are manufactured independently, so when the lower mold needs to be opened again, only the lower mold cavity fixture needs to be replaced, while the corresponding test valve seat does not need to be replaced. Furthermore, the product leakage level is determined by detecting any molecule or element in the electrolyte, eliminating the need to treat the battery casing with helium. Mass spectrometry testing is performed on the battery casing for leakage, which reduces the cost of replacing the lower mold and optimizes the detection method.

[0011] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0012] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mass spectrometry testing mechanism for casing leakage, characterized in that, It includes: The upper mold cover has a downward-protruding sealing protrusion at the center of its bottom; The lower mold cavity fixture has a recessed lower cavity at the center of its upper surface. The lower cavity is connected to a vacuum pumping passage, a mass spectrometry detection passage, and a nitrogen gas passage. The vacuum pumping passage, mass spectrometry detection passage, and nitrogen gas passage extend to the lower surface of the lower mold cavity fixture. The lower surface of the lower mold cavity fixture is also provided with several recessed positioning grooves. The test valve seat includes several upwardly protruding positioning protrusions and corresponding vacuum inlet, mass spectrometry detection inlet, and nitrogen inlet / outlet. The four sides of the test valve seat are respectively provided with outwardly protruding nitrogen on / off valve, mass spectrometry test valve, and cavity vacuum valve. The four sides of the test valve seat are also respectively provided with outwardly protruding connectors for nitrogen pipeline, mass spectrometry test pipeline, and cavity vacuum pipeline. The nitrogen on / off valve is used to open or close the nitrogen pipeline, the mass spectrometry test valve is used to open or close the mass spectrometry test pipeline, and the cavity vacuum valve is used to open or close the cavity vacuum pipeline. And a mass spectrometry testing apparatus, which includes a diaphragm pump, a molecular pump, a mass spectrometer, a test vacuum gauge, a mass spectrometry test vacuum gauge, and several test on / off valves; In the test state, the battery casing is placed in the lower cavity, and the convex sealing cover is installed in the upper region of the lower cavity. The diaphragm pump and the mass spectrometer test vacuum gauge are connected to the external connector of the cavity vacuum pipeline through the test on / off valve. The molecular pump and the test vacuum gauge are connected to the external connector of the cavity vacuum pipeline through the test on / off valve. The mass spectrometer is connected to the external connector of the mass spectrometer test pipeline through the test on / off valve. The external connector of the nitrogen pipeline is connected to a nitrogen gas source.

2. The mass spectrometry testing mechanism for casing leakage according to claim 1, characterized in that: The vacuuming passage, mass spectrometry detection passage, and nitrogen passage correspond to the central area of ​​the lower surface of the lower mold cavity fixture. The two sets of recessed positioning grooves are arranged on the outer periphery of the central area of ​​the lower surface of the lower mold cavity fixture, and the position of the positioning protrusion corresponds to the position of the recessed positioning groove.

3. The mass spectrometry testing mechanism for casing leakage according to claim 2, characterized in that: The positioning protrusion is inserted into the concave positioning groove, and the vacuum inlet is arranged in the vacuum passage, the mass spectrometry detection inlet is arranged in the mass spectrometry detection passage, and the nitrogen inlet / outlet is arranged in the nitrogen passage.

4. The mass spectrometry testing mechanism for casing leakage according to claim 1, characterized in that: The upper part of the upper mold cover is also provided with a drive connecting frame, and the top of the drive connecting frame is externally connected to a lifting power mechanism.

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