Battery cell sealing performance detection device

Abstract

The utility model provides a battery cell sealing performance detection device. The battery cell sealing performance detection device comprises a first shell fixedly arranged on an installation base body, a second shell capable of covering the first shell in a sliding mode, and a telescopic pipe with one end hinged to the installation base body. A battery cell is inserted into the first shell; the telescopic pipe is connected with the vacuum pump and the mass spectrometer, and the free end of the telescopic pipe is provided with a suction nozzle. When the free end of the telescopic pipe moves to the position between the first shell and the second shell, the telescopic pipe can be driven to rotate so that the suction nozzle can be connected to the liquid injection opening of the battery cell in a sealing and pressing mode; the second shell is connected with the vacuum pump and the mass spectrometer, and when the second shell covers the first shell, the second shell and the first shell define a sealed cavity for containing the battery cell. The battery cell sealing detection device has the effects of facilitating detection of the overall sealing performance of the battery cell and reducing the risk of missed killing.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery cell detection, especially relates to a battery cell sealing property detection device. BACKGROUND

[0002] As an important part in the new energy industry, the safety of lithium ion battery is the key part of the research, and the sealing property of the battery cell plays a crucial role in the safety of the battery cell, at present, the sealing property test mainly tests the welding sealing property of the welding area around the battery cell shell and the sealing property of the liquid injection port in the battery cell assembly stage, and the sealing property test in the assembly stage uses the helium injection process combined with the vacuum box type helium detection method, and the sealing property test in the formation stage uses the helium embedding process combined with the vacuum box type helium detection method.

[0003] In the related art, the detection principle of the secondary helium detection in the formation stage is to place the sealed battery cell into the sealed cavity of the equipment, detect the leaked helium concentration by using the connected helium mass spectrometer leak detector through vacuumizing, convert the battery cell leakage rate, and thus detect the battery cell with poor sealing, and the general battery cell leakage rate requirement is ≤9.9*10-7Pa·m / s. 3 The conventional helium detection equipment can only detect the sealing property as a whole, cannot detect the key parts such as the liquid injection port, the detection function is relatively single, and the missing detection phenomenon exists. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims at providing a battery cell sealing property detection device to facilitate the detection of the overall sealing property of the battery cell and reduce the missing detection risk.

[0005] To achieve the above object, the technical scheme of the utility model is as follows:

[0006] A battery cell sealing property detection device, comprising a first shell fixed on a mounting base, a second shell capable of slidingly covering the first shell, and an extension tube hingedly connected to one end of the mounting base;

[0007] The first shell is inserted with a battery cell; the extension tube is connected with a vacuum pump and a mass spectrometer respectively, and a free end of the extension tube is provided with a suction nozzle; when the free end of the extension tube is moved to between the first shell and the second shell, the extension tube can be driven to rotate so that the suction nozzle is sealingly pressed at the liquid injection port of the battery cell;

[0008] The second shell is connected with the vacuum pump and the mass spectrometer respectively, and when the second shell covers the first shell, a sealed cavity accommodating the battery cell is formed with the first shell.

[0009] Further, an electric push rod is hingedly connected between the hinged end and the free end of the extension tube, and the electric push rod is used to drive the extension tube to extend and retract.

[0010] Further, the electric core sealing detection device further comprises a driving part arranged on the mounting base body, and the driving part is provided with a driving end capable of driving the telescopic pipe to rotate.

[0011] Further, the driving part comprises a first cylinder arranged on the mounting base body, and a limiting ring fixedly connected to a piston end of the first cylinder; the limiting ring is provided with a limiting hole for the telescopic pipe to pass through.

[0012] Further, a second cylinder is arranged on the mounting base body; a piston end of the second cylinder is connected to the second shell body, so as to drive the second shell body to cover or separate from the first shell body.

[0013] Further, a support body is fixedly arranged on an inner wall of the first shell body, and the support body contacts a side wall of the electric core.

[0014] Further, a pressing part is arranged in the first shell body, and the pressing part can press the electric core on the support body.

[0015] Further, the pressing part comprises a pressing plate and an elastic piece; the pressing plate is slidingly arranged in the first shell body, and the elastic piece is arranged between the pressing plate and the inner wall of the first shell body; when the pressing plate slides away from the electric core, the elastic piece stores energy, and when the elastic piece releases the energy, the elastic piece can push the pressing plate to press the electric core.

[0016] Further, the mass spectrometer is provided with a standard leak hole.

[0017] Further, the telescopic pipe is connected with a compressed helium source, so as to perform helium blowing on the liquid injection port; and / or,

[0018] The telescopic pipe is connected with a compressed nitrogen source, so as to perform nitrogen blowing on the telescopic pipe and the liquid injection port.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The electric core sealing detection device adjusts the free end of the telescopic pipe to make the suction nozzle seal and press the liquid injection port, starts the vacuum pump to perform vacuumizing on the telescopic pipe, at this time, the mass spectrometer performs sealing detection on the liquid injection port of the electric core; if the sealing detection on the liquid injection port is qualified, the telescopic pipe is retracted, and the second shell body is adjusted to cover on the first shell body to form a sealed chamber, at this time, the vacuum pump performs vacuumizing on the sealed chamber, and then the mass spectrometer detects the helium content in the sealed chamber to judge the sealing of the whole electric core; the whole detection and the detection on the liquid injection port are realized, and then the detection on the whole sealing of the electric core is facilitated, and the risk of leakage is reduced.

[0021] Secondly, by setting the compressed helium source, the liquid injection port can be purged, impurities and pollutants can be removed, and helium can enter the small leakage channel of the sealing nail, so that the subsequent small leakage channel is more easily detected.

[0022] Meanwhile, when the liquid injection port has poor sealing and leaks, the compressed nitrogen source is started, and nitrogen purges the telescopic pipe and the liquid injection port to reduce the residual helium in the liquid injection port.

[0023] Thirdly, the support separates the side wall of the battery cell from the inner wall of the first shell, so that when the battery cell leaks, the inner wall of the first shell does not hinder the gas from leaking out, and the battery cell can be easily removed. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the embodiments of the present application and their descriptions, and do not constitute improper limitations on the present application. In the drawings:

[0025] Figure 1 The overall structure schematic diagram of the battery cell sealing property detection device is described in the embodiments of the present application;

[0026] Figure 2 The partial part schematic diagram of the telescopic pipe is described in the embodiments of the present application;

[0027] Figure 3 The partial part sectional view of the battery cell sealing property detection device is described in the embodiments of the present application.

[0028] Explanation of reference signs:

[0029] 1, mounting base; 101, second cylinder;

[0030] 2, first shell; 2a, sealing chamber;

[0031] 3, second shell; 301, sealing ring;

[0032] 4, telescopic pipe; 401, suction nozzle; 4a, hinged end; 4b, free end; 402, base pipe; 403, sleeve;

[0033] 5, battery cell; 501, liquid injection port;

[0034] 6, vacuum pump;

[0035] 7, mass spectrometer; 701, standard leak hole;

[0036] 8, electric push rod;

[0037] 9, driving part; 901, first cylinder; 902, limiting ring; 9021, limiting hole;

[0038] 10. Support structure;

[0039] 11. Pressing part; 1101. Pressure plate; 1102. Elastic element;

[0040] 12. Compressed helium gas source;

[0041] 13. Compressed nitrogen source;

[0042] 14. First connecting pipe; 1401. Second connecting pipe; 1402. Valve; 1403. Third connecting pipe. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0044] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] This embodiment relates to a battery cell sealing test device to facilitate the detection of the overall sealing performance of the battery cell and reduce the risk of missed detection.

[0048] In terms of overall structure, refer to Figures 1 to 3The battery cell sealing test device in this embodiment includes a first housing 2 fixed on a mounting base 1, a second housing 3 capable of slidingly covering the first housing 2, and a telescopic tube 4 with one end hinged to the mounting base 1; a battery cell 5 is inserted into the first housing 2; the telescopic tube 4 is connected to a vacuum pump 6 and a mass spectrometer 7 respectively, and the free end 4b of the telescopic tube 4 is provided with a suction nozzle 401; when the free end 4b of the telescopic tube 4 moves between the first housing 2 and the second housing 3, the telescopic tube 4 can be driven to rotate so that the suction nozzle 401 is sealed and pressed against the liquid injection port 501 of the battery cell 5; the second housing 3 is connected to the vacuum pump 6 and the mass spectrometer 7 respectively, and when the second housing 3 covers the first housing 2, it and the first housing 2 together form a sealed chamber 2a for accommodating the battery cell 5.

[0049] As set up above, by adjusting the free end 4b of the telescopic tube 4, the suction nozzle 401 is sealed and pressed against the liquid injection port 501. The vacuum pump 6 is started to evacuate the telescopic tube 4, and then the mass spectrometer 7 performs a sealing test on the liquid injection port 501 of the battery cell 5. If the sealing test at the liquid injection port 501 is qualified, the telescopic tube 4 is contracted, and the second shell 3 is adjusted to cover the first shell 2 to form a sealed chamber 2a. At this time, the vacuum pump 6 evacuates the sealed chamber 2a, and then the mass spectrometer 7 detects the helium content in the sealed chamber 2a to determine the overall sealing performance of the battery cell 5. This allows for both overall testing and testing at the liquid injection port 501, which is beneficial for detecting the overall sealing performance of the battery cell 5 and reducing the risk of leakage.

[0050] Based on the above overview, refer to Figures 1 to 3 Specifically, as an optional implementation, the telescopic tube 4 includes a base tube 402 and a sleeve 403. The sleeve 403 is slidably fitted inside the base tube 402. The base tube 402 is connected to the mounting base 1, and the suction nozzle 401 is connected to the sleeve 403. The end of the base tube 402 connected to the mounting base 1 is the hinge end 4a of the telescopic tube 4, and the end of the sleeve 403 connected to the suction nozzle 401 is the free end 4b of the telescopic tube 4. The sleeve 403 slides inside the base tube 402 to adjust the suction nozzle 401 to move closer to or further away from the injection port 501.

[0051] Meanwhile, the suction nozzle 401 is used to seal the liquid injection port 501. As one possible implementation, in order to facilitate the tight sealing of the suction nozzle 401 at the liquid injection port 501, the suction nozzle 401 is preferably made of rubber. When the suction nozzle 401 is sealed at the liquid injection port 501, the suction nozzle 401 undergoes slight deformation to improve the sealing of the connection. At the same time, the suction nozzle 401 configured in this way has a certain resistance to deformation when the vacuum pump 6 is drawing a vacuum.

[0052] Based on the provision of a second housing 3 covering the first housing 2 to form a sealed chamber 2a, refer to Figure 2To improve the sealing performance of the sealed chamber 2a, a sealing ring 301 can be fixed to the open end face of the second housing 3. After the sealing ring 301 abuts against the first housing 2, it helps to improve the sealing performance of the sealed chamber 2a.

[0053] As one embodiment where the telescopic tube 4 is connected to the vacuum pump 6 and the mass spectrometer 7, refer to Figure 1 and Figure 2 A first connecting pipe 14 is connected to the hinge end 4a of the telescopic tube 4, and the other end of the first connecting pipe 14 is connected to the vacuum pump 6, thereby realizing the connection between the telescopic tube 4 and the vacuum pump 6; on this basis, a second connecting pipe 1401 is set and one end of the second connecting pipe 1401 is connected to the gas inlet of the mass spectrometer 7, and the remaining end is connected to the first connecting pipe 14, thus realizing the connection between the telescopic tube 4 and the mass spectrometer 7.

[0054] In order to facilitate the evacuation of the telescopic tube 4, valves 1402 are provided at the connection points of the vacuum pump 6 and the first connecting pipe 14, the connection points of the second connecting pipe 1401 and the mass spectrometer 7, and the connection points of the telescopic tube 4 and the suction nozzle 401, so as to adjust the connection and disconnection between the telescopic tube 4, the vacuum pump 6 and the mass spectrometer 7, so as to realize the evacuation of the telescopic tube 4 first and then the sealing test of the mass spectrometer 7.

[0055] Based on the above configuration, as an optional implementation method for connecting the second housing 3 with the vacuum pump 6 and the mass spectrometer 7, specifically, in implementation, a third pipe 1403 is connected to the second housing 3, and the remaining end of the third pipe 1403 is connected to the second pipe 1401. A valve 1402 is also connected between the second housing 3 and the third pipe 1403, thus realizing the connection between the second housing 3 and the vacuum pump 6 and the mass spectrometer 7, and the on / off state can be adjusted by the valve 1402.

[0056] To further improve the accuracy of test data, refer to Figure 1 The telescopic tube 4 is connected to a compressed helium source 12 to purge the injection port 501 with helium. By setting up the compressed helium source 12, the injection port 501 can be purged to remove impurities and contaminants. At the same time, helium can enter the small leakage channel at the injection port, making subsequent small leakage channels easier to detect.

[0057] In one specific implementation, helium gas is compressed into a sealed container to make it under high pressure, thus completing the fabrication of the compressed helium gas source 12. The sealed container of the compressed helium gas source 12 is then connected to the first pipe 14. To facilitate the adjustment of whether the compressed helium gas source 12 releases helium gas, a valve 1402 is also provided on the sealed container of the compressed helium gas source 12.

[0058] Meanwhile, based on the setup of compressed helium source 12, in order to further improve the accuracy of the detection data, refer to Figure 1The telescopic tube 4 is connected to a compressed nitrogen source 13 to purge the telescopic tube 4 and the injection port 501 with nitrogen.

[0059] With this setup, when there is a leak due to poor sealing at the injection port 501, the compressed nitrogen source 13 is activated, and the nitrogen is used to purge the telescopic tube 4 and the injection port 501 to reduce the residual helium at the injection port 501.

[0060] Similarly, as an optional implementation, nitrogen gas is compressed in a sealed container to make it under high pressure, thus completing the fabrication of the compressed nitrogen source 13. The sealed container of the compressed nitrogen source 13 is then connected to the first pipe 14. To facilitate the adjustment of whether the compressed nitrogen source 13 releases nitrogen gas, a valve 1402 is also provided on the sealed container of the compressed nitrogen source 13.

[0061] To further improve the accuracy of the detection data, in addition to setting up a compressed helium source 12 and a compressed nitrogen source 13, the mass spectrometer 7 is also equipped with a standard leak 701. By setting up the standard leak 701 on the mass spectrometer 7, it is possible to calibrate and verify whether the reading of the mass spectrometer 7 is normal.

[0062] It is worth noting that, referring to Figure 1 and Figure 2 An electric push rod 8 is hinged between the hinged end 4a and the free end 4b of the telescopic tube 4. The electric push rod 8 is used to drive the telescopic tube 4 to extend and retract. By setting the electric push rod 8 to adjust the length of the telescopic tube 4, the position of the suction nozzle 401 can be precisely adjusted so as to seal the suction nozzle 401 at the liquid injection port 501.

[0063] Based on the telescopic tube 4, which includes the base tube 402 and the sleeve 403, the cylinder of the electric push rod 8 is connected to the sleeve 403, and the piston rod of the electric push rod 8 is connected to the sleeve 403. Thus, during the extension and retraction of the electric push rod 8, the length of the telescopic tube 4 is adjusted.

[0064] As a way to adjust the position of the suction nozzle 401, the battery cell sealing test device also includes a drive unit 9 provided on the mounting base 1. The drive unit 9 has a drive end that can drive the telescopic tube 4 to rotate. The telescopic tube 4 is driven to rotate by the drive unit 9. When the telescopic tube 4 is aligned with the liquid injection port 501, the drive unit 9 drives the telescopic tube 4 to rotate, thereby causing the suction nozzle 401 to be sealed on the liquid injection port 501.

[0065] As an optional implementation of the drive unit 9, refer to Figure 1 and Figure 2The drive unit 9 includes a first cylinder 901 mounted on the mounting base 1 and a limiting ring 902 fixed to the piston end of the first cylinder 901; the limiting ring 902 has a limiting hole 9021 for the telescopic tube 4 to pass through. When the drive unit 9 is used to adjust the rotation of the telescopic tube 4, the first cylinder 901 is activated, and the piston end of the first cylinder 901 drives the limiting ring 902 to move, thereby driving the telescopic tube 4 to rotate.

[0066] It is worth noting that the diameter of the limiting hole 9021 is larger than the diameter of the telescopic tube 4, so as to allow the telescopic tube 4 to extend and retract within the limiting hole 9021, and to provide the space required for the telescopic tube 4 to rotate when the limiting ring 902 moves up and down along the axis of the first cylinder 901, and to obtain a suitable clamping force for the suction nozzle 401 by adjusting the air pressure of the first cylinder 901.

[0067] To facilitate the adjustment of the position of the second housing 3 so that the second housing 3 can cover the first housing 2, a second cylinder 101 is provided on the mounting base 1; the piston end of the second cylinder 101 is connected to the second housing 3 to drive the second housing 3 to cover or detach from the first housing 2.

[0068] Specifically, the opening of the first housing 2 faces upwards, and the opening of the second housing 3 faces downwards. When the second cylinder 101 is installed, after the piston end of the second cylinder 101 is connected to the second housing 3, it can drive the second housing 3 to move up and down, so as to realize the closing and separation of the second housing 3 from the first housing 2. With this configuration, when the second housing 3 is separated from the first housing 2, the space between the first housing 2 and the second housing 3 facilitates the telescopic tube 4 to move the suction nozzle 401 to above the liquid injection port 501.

[0069] To facilitate the placement and removal of battery cell 5, refer to Figure 3 A support 10 is fixed on the inner wall of the first housing 2, and the support 10 contacts the side wall of the battery cell 5. The support 10 separates the side wall of the battery cell 5 from the inner wall of the first housing 2, so that when the battery cell 5 leaks air from the housing, the inner wall of the first housing 2 does not obstruct the gas leakage; it also makes it easier to remove the battery cell 5.

[0070] As an alternative implementation of the support body 10, specifically, in practice, the support body 10 can be set as a long strip column structure and placed vertically; or the support body 10 can be set as a rectangular block structure to satisfy the separation of the side wall of the battery cell 5 from the inner wall of the first housing 2, and to make the space between the first housing 2 and the battery cell 5 communicate with the space inside the second housing 3 so that helium gas can circulate in the sealed chamber 2a.

[0071] To improve the stability of the battery cell 5 placed inside the first housing 2, refer to Figures 1 to 3The first housing 2 is provided with a pressing part 11, which can press the battery cell 5 onto the support body 10. Specifically, as an optional embodiment, the pressing part 11 includes a pressure plate 1101 and an elastic member 1102; the pressure plate 1101 is slidably disposed in the first housing 2, and the elastic member 1102 is disposed between the pressure plate 1101 and the inner wall of the first housing 2; when the pressure plate 1101 slides away from the battery cell 5, the elastic member 1102 stores energy, and when the elastic member 1102 releases energy, it can push against the pressure plate 1101 to press the battery cell 5. As an optional embodiment, the elastic member 1102 can be a spring.

[0072] By setting the pressing part 11 as a pressure plate 1101 and an elastic element 1102, the elastic element 1102 completes energy storage during the process of placing the battery cell 5 into the first housing 2. After the battery cell 5 is placed in the first housing 2, the elastic element 1102 pushes the pressure plate 1101 to press against the battery cell 5, thus stabilizing the battery cell 5 and making it easy to operate and use.

[0073] The battery cell sealing test device described in this application uses a compressed helium source 12 to purge the liquid injection port 501 of the battery cell 5 during testing. After purging, the length of the telescopic tube 4 is adjusted and the drive unit 9 is controlled to seal the suction nozzle 401 onto the liquid injection port 501. At this time, the vacuum pump 6 is started to evacuate the telescopic tube 4 and the connecting pipeline to achieve sealing test at the liquid injection port 501. If the helium test at the liquid injection port 501 is qualified, the length of the telescopic tube 4 is adjusted and the drive unit 9 is controlled to disengage the suction nozzle 401 from the liquid injection port 501. At this time, under the action of the second cylinder 101, the second housing 3 is fastened onto the first housing 2. The vacuum pump 6 is started to evacuate the sealing chamber 2a and the connecting pipeline. Then, the mass spectrometer 7 is used to perform helium testing to detect the overall sealing performance of the battery cell 5 and determine the overall sealing performance of the battery cell 5. The helium testing sealing is then completed.

[0074] If the helium test at the injection port 501 fails, the compressed nitrogen source 13 is activated to purge the telescopic tube 4 and the injection port 501 to reduce the residual helium at the injection port 501. The sealing test of the cell 5 is then completed.

[0075] By adjusting the free end 4b of the telescopic tube 4 to seal the nozzle 401 at the injection port 501, the vacuum pump 6 is started to evacuate the telescopic tube 4. At this time, the mass spectrometer 7 performs a sealing test on the injection port 501 of the battery cell 5. If the sealing test at the injection port 501 is qualified, the telescopic tube 4 is contracted, and the second shell 3 is adjusted to cover the first shell 2 to form a sealed chamber 2a. At this time, the vacuum pump 6 evacuates the sealed chamber 2a, and then the mass spectrometer 7 detects the helium content in the sealed chamber 2a to determine the overall sealing performance of the battery cell 5. This allows for both overall testing and testing at the injection port 501, which is beneficial for the overall sealing performance of the battery cell 5 and reduces the risk of leakage.

[0076] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1.A device for detecting the sealing property of an electric cell, comprising: a first housing fixed on a mounting base; a second housing capable of covering the first housing; a telescopic tube hingedly connected to the mounting base; the first housing is provided with an electric cell; the telescopic tube is connected to a vacuum pump and a mass spectrometer respectively, and a free end of the telescopic tube is provided with a suction nozzle; when the free end of the telescopic tube is moved to between the first housing and the second housing, the telescopic tube is driven to rotate so that the suction nozzle is sealingly pressed at a liquid injection port of the electric cell; the second housing is connected to the vacuum pump and the mass spectrometer respectively, and when the second housing covers the first housing, a sealed chamber containing the electric cell is formed with the first housing. 2.The device for detecting the sealing property of an electric cell according to claim 1, wherein: an electric push rod is hingedly connected between the hinged end and the free end of the telescopic tube, and the electric push rod is used to drive the telescopic tube to extend or retract. 3.The device for detecting the sealing property of an electric cell according to claim 1, further comprising: a driving part provided on the mounting base, and the driving part is provided with a driving end capable of driving the telescopic tube to rotate. 4.The device for detecting the sealing property of an electric cell according to claim 3, wherein: the driving part comprises a first cylinder provided on the mounting base, and a limiting ring fixed on a piston end of the first cylinder; the limiting ring is provided with a limiting hole for the telescopic tube to pass through. 5.The device for detecting the sealing property of an electric cell according to claim 1, wherein: a second cylinder is provided on the mounting base; a piston end of the second cylinder is connected to the second housing to drive the second housing to cover or separate from the first housing. 6.The device for detecting the sealing property of an electric cell according to claim 1, wherein: a support body is fixed on an inner wall of the first housing, and the support body contacts a side wall of the electric cell. 7.The device for detecting the sealing property of an electric cell according to claim 6, wherein: a pressing part is provided in the first housing, and the pressing part is capable of pressing the electric cell on the support body. 8.The device for detecting the sealing property of an electric cell according to claim 7, wherein: the pressing part comprises a pressing plate and an elastic member; the pressing plate is slidingly provided in the first housing, and the elastic member is provided between the pressing plate and the inner wall of the first housing; when the pressing plate slides away from the electric cell, the elastic member is energized, and when the elastic member is released, the elastic member is capable of pushing the pressing plate to press the electric cell. 9.The device for detecting the sealing property of an electric cell according to claim 1, wherein: the mass spectrometer is provided with a standard leak hole. 10.The device for detecting the sealing property of an electric cell according to any one of claims 1 to 9, wherein: the telescopic tube is connected to a compressed helium source to perform helium purge on the liquid injection port; and / or the telescopic tube is connected to a compressed nitrogen source to perform nitrogen purge on the telescopic tube and the liquid injection port. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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