Liquid leakage detection device and battery production system

Abstract

The application discloses a liquid leakage detection device and a battery production system. The liquid leakage detection device comprises a gas collection component, a detection component and a gas supply mechanism. The gas collection component comprises a placing chamber, a first opening and closing mechanism and an exhaust port in communication with the placing chamber. The first opening and closing mechanism is connected to the outside of the placing chamber and is used to open or close the exhaust port. The placing chamber is configured to place a to-be-detected piece and is configured to draw negative pressure. The detection component is located outside the placing chamber and has a detection inlet in communication with the placing chamber. The detection component is used to detect the concentration of volatile matters of the to-be-detected piece. The gas supply mechanism is located outside the placing chamber and has a gas outlet in communication with the placing chamber. The gas supply mechanism has an opening state of supplying clean gas into the placing chamber and a closing state of stopping the clean gas from being supplied into the placing chamber. The gas supply mechanism is configured to supply the clean gas into the placing chamber before the placing chamber draws negative pressure.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, specifically to a leakage detection device and a battery production system. Background Technology

[0002] To ensure long-term battery life, airtightness testing is necessary to reduce issues such as electrolyte leakage, air and moisture ingress, and other problems caused by poor sealing during battery use. Currently, however, airtightness testing yields inaccurate results. Utility Model Content

[0003] In view of the above problems, this application provides a leakage detection device. Before detection, a cleaning gas is introduced into the placement chamber through a gas supply mechanism to purge the chamber and remove the gas that may affect the detection results, thereby reducing the impact of the detection process on the test results.

[0004] In a first aspect, this application provides a leakage detection device, comprising:

[0005] The gas collection component includes a placement chamber, a first opening and closing mechanism, and an exhaust port communicating with the placement chamber. The placement chamber is externally connected to the first opening and closing mechanism for opening or closing the exhaust port. The placement chamber is configured to place the test piece and is configured to draw negative pressure.

[0006] The detection component is located outside the placement chamber. The detection component has a detection inlet configured to communicate with the placement chamber. The detection component is used to detect the concentration of volatiles in the test item.

[0007] A gas supply mechanism is located outside the placement chamber. The gas supply mechanism has a gas outlet end that communicates with the placement chamber. The gas supply mechanism has an open state for introducing clean gas into the placement chamber and a closed state for stopping the introduction of clean gas into the placement chamber. The gas supply mechanism is configured to introduce clean gas into the placement chamber before the placement chamber is evacuated from negative pressure.

[0008] The component to be tested can be a battery. Before testing or after the last test, a gas supply mechanism introduces clean gas (gas free of electrolyte components) into the placement chamber to purge it. This allows gases containing electrolyte components that could affect the test results to escape through the exhaust port. Then, the first opening and closing mechanism is closed, evacuating the placement chamber to a negative pressure state. When electrolyte leaks, it evaporates into volatiles under this negative pressure. The concentration of these volatiles is detected by a detection component. If the concentration reaches a target value, a leak in the battery's electrolyte can be confirmed; conversely, if the target value is not reached, no leak is detected. Therefore, introducing clean gas into the placement chamber through a gas supply mechanism can reduce the impact on the test results and improve testing accuracy.

[0009] In some embodiments, the gas supply mechanism includes a gas supply valve having an open state and a closed state.

[0010] This allows for the opening and closing of the gas supply mechanism, and by switching between different states, it enables the detection of volatile concentrations and the cleaning of the placement chamber.

[0011] In some embodiments, the gas supply mechanism further includes a gas storage container connected to the gas inlet of the gas supply valve, and the gas storage container is used to store compressed clean gas.

[0012] The gas storage container can store pre-compressed clean gas. When the gas supply valve is opened, the gas storage container can instantly release high-pressure gas. Compared with directly introducing compressed gas into the placement chamber through pipelines via compressors or air pumps, this reduces the number of compressor or air pump starts, saving energy. Furthermore, as an independent gas source, the gas storage container allows the leak detection device to perform multiple consecutive checks, reducing waiting time and improving the efficiency of the entire detection process.

[0013] In some embodiments, the gas supply mechanism further includes a gas supply path, through which the gas storage container is connected to the gas inlet end of the gas supply valve; and / or, through which the gas supply valve is connected to the placement chamber.

[0014] The gas supply path design facilitates the connection of the gas storage container, gas supply valve, and placement chamber.

[0015] In some embodiments, the gas collection component further includes a nozzle located in the placement chamber and communicating with the gas outlet.

[0016] The nozzle design increases the purging area of ​​the placement chamber, reducing the possibility of uncleaned corners within the chamber.

[0017] In some embodiments, the first opening and closing mechanism includes an opening and closing valve.

[0018] This allows the exhaust port to be opened and closed.

[0019] In some embodiments, the gas collection component further includes a negative pressure assembly located outside the placement chamber. The negative pressure assembly has an intake end communicating with the placement chamber. The negative pressure assembly includes a vacuuming mechanism and a negative pressure on / off valve. The vacuuming mechanism has a first inlet port and a first outlet port, and the negative pressure on / off valve has a second inlet port and a second outlet port.

[0020] The first air inlet port is connected to the second air outlet port, or the first air outlet port is connected to the second air inlet port.

[0021] This allows leaked liquid in the chamber to evaporate into volatiles under negative pressure, making it easier to detect whether the component under test is leaking.

[0022] In some embodiments, the detection component includes a first detection mechanism, and the leakage detection device further includes a first connecting flow path. One end of the first connecting flow path is connected to the placement chamber. The first detection mechanism has a detection inlet, and the other end of the first connecting flow path is connected to the detection inlet. The first connecting flow path includes a first valve, which is used to open or close the first connecting flow path. The first detection mechanism is used to detect the total concentration of volatiles.

[0023] After the placement chamber is evacuated to negative pressure and maintained for a period of time, the first valve and the gas supply mechanism can be opened, allowing the first detection mechanism to detect the concentration of volatiles to determine whether there is a leak. When the concentration of volatiles is lower than the preset value, there is no leak; when the concentration of volatiles is greater than or equal to the preset value, there is a leak.

[0024] In some embodiments, the detection component includes a second detection mechanism, and the leakage detection device further includes a second connecting flow path. One end of the second connecting flow path is in communication with the placement chamber. The second detection mechanism has a detection inlet, and the other end of the second connecting flow path is in communication with the detection inlet. The second connecting flow path includes a second valve for opening or closing the second connecting flow path. The second detection mechanism is used to detect the concentration of different components of the volatiles.

[0025] The second testing agency can determine whether there is a leak in the tested component by detecting the concentration of different components of the volatile matter, and can also analyze the composition of the leaked liquid. Taking a battery as an example, by detecting the composition of the leaked electrolyte, the chemical reactions occurring inside the battery can be analyzed to understand its performance. During testing, the second valve is opened to allow the volatile matter to enter the detection inlet for testing.

[0026] In some embodiments, the detection component includes a first detection mechanism and a second detection mechanism. The leakage detection device further includes a connecting flow path, which has an air inlet, a first exhaust port, and a second exhaust port. The air inlet communicates with the placement chamber. The detection inlet includes a first detection inlet and a second detection inlet. The first detection mechanism has a first detection inlet, and the second detection mechanism has a second detection inlet. The first exhaust port communicates with the first detection inlet, and the second exhaust port communicates with the second detection inlet. The connecting flow path includes a switching mechanism for connecting or disconnecting at least one of the first exhaust port and the second exhaust port from the air inlet. The first detection mechanism is used to detect the total concentration of volatiles, and the second detection mechanism is used to detect the concentration of different components of volatiles.

[0027] Therefore, by adjusting the switching mechanism, the first detection inlet and / or the second detection inlet can be connected to the air inlet, so that the first detection mechanism and / or the second detection mechanism can detect the leaked liquid in the test piece to meet different usage requirements.

[0028] In some embodiments, the switching mechanism is a switching valve, and the connecting flow path includes a main flow path, a first branch path and a second branch path. The first branch path and the second branch path are respectively connected to the main flow path. The main flow path has an air inlet, the first branch path has a first exhaust port, and the second branch path has a second exhaust port. The first branch path and the second branch path are respectively provided with switching valves. The switching valve provided in the first branch path is used to connect or disconnect the air inlet path and the first exhaust port, and the switching valve provided in the second branch path is used to connect or disconnect the air inlet path and the second exhaust port.

[0029] By adjusting different switching valves, the first detection mechanism and / or the second detection mechanism can detect the leaking liquid in the test piece to meet different usage requirements.

[0030] In some embodiments, the connecting flow path includes a main flow path, a first branch path, and a second branch path. The first branch path and the second branch path are respectively connected to the main flow path. The main flow path has an air inlet. The first branch path has a first exhaust port. The second branch path has a second exhaust port. The switching mechanism has a flow inlet, a first flow outlet, and a second flow outlet. The main flow path is connected to the flow inlet. The first flow outlet is connected to the first branch path. The second flow outlet is connected to the second branch path.

[0031] Therefore, by adjusting the switching mechanism, the inlet can be connected to the first outlet, or the inlet can be connected to the second outlet. Then, the first or second detection mechanism can be used to detect whether there is leakage in the test piece, so as to facilitate subsequent qualitative or quantitative analysis of the leaked liquid.

[0032] In some embodiments, the switching mechanism includes either a solenoid valve or an electric valve.

[0033] Therefore, by adjusting the position of the solenoid valve or electric valve, the inlet can be connected to the first outlet, or the inlet can be connected to the second outlet.

[0034] In some embodiments, the first testing institution includes a volatile organic compound detector (VOC detector).

[0035] This allows for the detection of the total concentration of volatile substances.

[0036] In some embodiments, the second detection mechanism includes a triple quadrupole mass spectrometer.

[0037] This allows for the detection of the concentration of different components of volatile substances.

[0038] In some embodiments, the leakage detection device further includes a control unit, and at least one of the switching mechanism, the detection component, and the gas supply mechanism is communicatively connected to the control unit.

[0039] When the control unit is connected to the switching mechanism, it can adjust the mechanism according to received instructions, which is more convenient than manual adjustment. When the control unit is connected to the detection component, it can judge the detection results to determine whether the leak detection device is leaking. Specifically, if the concentration of volatiles is lower than a preset value, it is determined that there is no leak in the component under test; if the concentration of volatiles is greater than or equal to the preset value, it is determined that there is a leak. When the control unit is connected to the gas supply mechanism, it is more convenient than manually opening or closing the gas supply mechanism.

[0040] In some embodiments, the leakage detection device further includes an alarm mechanism that is communicatively connected to the control unit. When the placement chamber is in a clean state, the alarm mechanism is used to issue an alarm when the residual volatiles in the placement chamber reach a set value.

[0041] Therefore, the cleaning results can be monitored. If the cleaning results are unsatisfactory, an alarm mechanism will sound to prompt a second cleaning, continuing until the residual volatiles in the chamber are below the set value. Thus, the alarm mechanism facilitates multiple cleaning cycles.

[0042] Secondly, this application provides a battery production system, including the leakage detection device of the first aspect, wherein the component to be detected is a single battery cell.

[0043] Since the battery production system includes all the technical features of the leakage detection device in the first aspect described above, and its effect is the same as described above, it will not be repeated here.

[0044] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0045] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0046] Figure 1 This is a structural diagram of a leakage detection device according to the first embodiment of this application;

[0047] Figure 2 This is a structural diagram of a leakage detection device according to a second embodiment of this application;

[0048] Figure 3 This is a structural diagram of a leakage detection device according to a third embodiment of this application;

[0049] Figure 4 This is a structural diagram of a leakage detection device according to the fourth embodiment of this application;

[0050] Figure 5 This is a structural diagram of a leakage detection device according to the fifth embodiment of this application;

[0051] Figure 6 This is a structural diagram of a leakage detection device according to the sixth embodiment of this application;

[0052] Figure 7 This is a schematic diagram illustrating the working principle of an embodiment of the first testing institution of this application;

[0053] Figure 8 This is a schematic diagram illustrating the working principle of one embodiment of the second testing agency of this application.

[0054] The reference numerals in the detailed embodiments are as follows:

[0055] 100. Leakage detection device;

[0056] 10. Gas collection component; 11. Placement chamber; 111. Exhaust port; 12. First opening and closing mechanism; 13. Nozzle;

[0057] 20. Detection component; 21. First detection mechanism; 211. Ionization chamber; 212. First electrode; 213. Second electrode; 214. Ultraviolet lamp; 215. DC power supply; 22. Second detection mechanism; 221. Filament; 222. Electron receiver; 223. Ionization chamber; 224. Focusing lens; 225. Detector; 226. Mass analyzer;

[0058] 30. Gas supply mechanism; 31. Gas supply valve; 32. Gas storage container; 33. Gas supply path;

[0059] 40. Negative pressure assembly; 41. Vacuuming mechanism; 42. Negative pressure on / off valve;

[0060] 50. Connecting flow path; 51. Main flow path; 52. First branch path; 53. Second branch path; 54. Switching mechanism; 541. Switching valve;

[0061] 60. First connecting flow path; 61. First valve;

[0062] 70. Second connecting flow path; 71. Second valve;

[0063] 80. Control unit;

[0064] 90. Alarm system;

[0065] 200. Item to be tested. Detailed Implementation

[0066] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0068] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0069] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0070] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0071] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0072] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0073] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0074] For batteries to last a long time, airtightness testing is necessary to reduce problems such as electrolyte leakage, air and moisture entering the battery due to poor sealing during use. When multiple tests are performed, residual electrolyte volatile gases from previous tests can affect the accuracy of subsequent tests, leading to inaccurate results.

[0075] In view of this, this application provides a leakage detection device. Before detection, clean gas is introduced into the placement chamber of the gas collection component through a gas supply mechanism to facilitate the discharge of residual gas from the previous detection through the exhaust port. Then, the gas supply mechanism is turned off, and negative pressure is drawn into the placement chamber for detection. This can reduce the influence of residual gas from the previous detection on the detection results, thereby improving the detection accuracy.

[0076] The leakage detection device of this application can be used to detect, but is not limited to, individual battery cells.

[0077] For ease of explanation, the following embodiments use a leak detection device 100 from some embodiments of this application as an example.

[0078] Please refer to Figures 1-6The leakage detection device 100 includes a gas collection component 10, a detection component 20, and a gas supply mechanism 30. The gas collection component 10 includes a placement chamber 11, a first opening and closing mechanism 12, and an exhaust port 111 communicating with the placement chamber 11. The first opening and closing mechanism 12 for opening or closing the exhaust port 111 is connected to the outside of the placement chamber 11. The placement chamber 11 is configured to hold the object to be tested 200 and is configured to be under negative pressure. The detection component 20 and the gas supply mechanism 30 are located outside the placement chamber 11. The detection component 20 has a detection inlet configured to communicate with the placement chamber 11, and the detection component 20 is used to detect the concentration of volatile substances. The gas supply mechanism 30 has an outlet end that communicates with the placement chamber 11. The gas supply mechanism 30 has an open state for supplying clean gas to the placement chamber 11 and a closed state for stopping the supply of clean gas to the placement chamber 11. The gas supply mechanism 30 is configured to supply clean gas to the placement chamber 11 before drawing negative pressure into the placement chamber 11.

[0079] The cleaning gas can be air or a rare gas that does not contain the leaked components. The specific cleaning gas can be determined based on the composition of the leaked liquid.

[0080] In an alternative example, the placement chamber 11 has a closed door that is configured to be opened or closed to facilitate the placement or removal of the test piece 200 from the placement chamber 11.

[0081] In an alternative example, the placement chamber 11 is provided with a negative pressure port, and negative pressure can be drawn into the placement chamber 11 through an external negative pressure pipeline so that the leaked liquid can evaporate into gas for easy detection.

[0082] The gas supply mechanism 30 can have an independent gas source to supply clean gas to the placement chamber 11, or it can supply clean gas to the placement chamber 11 through an external gas source via the gas supply mechanism 30.

[0083] The first opening and closing mechanism 12 can be any one of an opening and closing door, a flange, or a valve, but is not limited to that of an opening and closing door. Taking the first opening and closing mechanism 12 as an opening and closing door as an example, the opening and closing door can be opened or closed with the exhaust port 111 through a door lock, and when the opening and closing door is in the closed state, the opening and closing door is sealed with the exhaust port 111 through a sealing ring.

[0084] During the testing process, the gas supply mechanism 30 can be opened to introduce clean gas into the detection inlet of the detection component 20. When leakage is present, the clean gas will contain components of the leakage, which can be detected by the detection component 20. Alternatively, the gas supply mechanism 30 can be closed, and a booster pump can be installed outside the placement chamber 11 to send the gas to be tested into the detection inlet for testing.

[0085] The test piece 200 can be a battery. Before testing or after the last test, the gas supply mechanism 30 introduces clean gas (gas without electrolyte components) into the placement chamber 11 to purge the chamber. This allows gases affecting the test results (gas containing electrolyte components) to be discharged from the exhaust port 111. Then, the first opening and closing mechanism 12 is closed, drawing the placement chamber 11 to a negative pressure state. When electrolyte leaks, the electrolyte evaporates into volatiles under negative pressure. The concentration of these volatiles is detected by the detection component 20. If the concentration of volatiles reaches a target value, it can be determined that there is an electrolyte leak in the battery; otherwise, if the target value is not reached, there is no leak. Therefore, introducing clean gas into the placement chamber 11 through the gas supply mechanism 30 can reduce the impact on the test results and improve the test accuracy.

[0086] In some embodiments, please refer to Figures 1-6 The gas supply mechanism 30 includes a gas supply valve 31, which has an open state and a closed state.

[0087] The air supply valve 31 can be connected to the placement chamber 11 through a pipeline, or it can be directly installed outside the placement chamber 11. One end of the air supply valve 31 is connected to the placement chamber 11.

[0088] When the air supply mechanism 30 provides clean air to the placement chamber 11 through an external air source, the air source can be connected to the other end of the air supply valve 31 through a pipeline.

[0089] This allows for the opening and closing of the gas supply mechanism 30, and by switching between different states, it enables the detection of volatile concentrations and the cleaning of the placement chamber 11.

[0090] In some embodiments, please refer to Figures 1-6 The gas supply mechanism 30 also includes a gas storage container 32, which is connected to the gas inlet end of the gas supply valve 31. The gas storage container 32 is used to store compressed clean gas.

[0091] The gas storage container 32 can be connected to the gas supply valve 31 via a pipeline, or the gas supply valve 31 can be directly installed on the gas storage container 32 as part of the gas storage container 32. For example, the gas supply valve 31 can be a pressure reducing valve, so that the output clean air is output at a predetermined pressure.

[0092] The gas storage container 32 can store pre-compressed clean gas. When the gas supply valve 31 is opened, the gas storage container 32 can release high-pressure gas instantaneously. Compared with directly introducing compressed gas into the placement chamber 11 through a compressor or air pump via a pipeline, this method can reduce the number of times the compressor or air pump is started, saving energy. Furthermore, as an independent gas source, the gas storage container 32 allows the leak detection device 100 to perform multiple consecutive detections, thereby reducing waiting time and improving the efficiency of the entire detection process.

[0093] In some embodiments, please refer to Figures 1-6 The gas supply mechanism 30 also includes a gas supply path 33, through which the gas storage container 32 is connected to the gas inlet end of the gas supply valve 31; and / or, through the gas supply path 33, the gas supply valve 31 is connected to the placement chamber 11.

[0094] The gas supply path 33 facilitates the connection of the gas storage container 32, the gas supply valve 31, and the placement chamber 11.

[0095] In some embodiments, the gas collection component 10 further includes a nozzle 13 located in the placement chamber 11. The nozzle 13 is connected to the outlet end of the gas supply mechanism 30 and is used to purge the inner surface of the placement chamber 11.

[0096] The nozzle 13 is designed to increase the purging area of ​​the placement chamber 11, thereby reducing the possibility of dead corners in the placement chamber 11 that have not been cleaned.

[0097] The spray angle of the nozzle 13 can be greater than or equal to 180°, so that the gas is sprayed and blown around the placement chamber 11, which results in a better cleaning effect.

[0098] In some embodiments, the first opening and closing mechanism 12 includes an opening and closing valve.

[0099] This allows the exhaust port 111 to be opened and closed.

[0100] In some embodiments, please refer to Figures 1-6 The gas collection component 10 also includes a negative pressure assembly 40, which has an intake end that communicates with the placement chamber 11. The negative pressure assembly 40 includes a vacuum mechanism 41 and a negative pressure on / off valve 42. The vacuum mechanism 41 has a first inlet port and a first outlet port, and the negative pressure on / off valve 42 has a second inlet port and a second outlet port.

[0101] The first air inlet port is connected to the second air outlet port, or the first air outlet port is connected to the second air inlet port.

[0102] The vacuum pumping mechanism 41 may include either a vacuum pump or a vacuum generator.

[0103] The first air inlet port and the second air outlet port can be directly connected, or they can be connected through a pipeline.

[0104] The first air outlet port and the second air inlet port can be directly connected, or they can be connected through a pipeline.

[0105] This allows the leaked liquid in the placement chamber 11 to evaporate into volatiles under negative pressure, making it easier to detect whether the test piece 200 is leaking.

[0106] In some embodiments, please refer to Figure 1 The detection component 20 includes a first detection mechanism 21, and the leakage detection device 100 also includes a first connecting flow path 60. One end of the first connecting flow path 60 is connected to the placement chamber 11. The first detection mechanism 21 has a detection inlet, and the other end of the first connecting flow path 60 is connected to the detection inlet. The first connecting flow path 60 includes a first valve 61, which is used to open or close the first connecting flow path 60. The first detection mechanism 21 is used to detect the total concentration of volatiles.

[0107] The first detection unit 21 can be a VOC (Volatile Organic Compounds) detector, specifically including but not limited to a photoionization detector (PID) type VOC detector. In other examples, the first detection unit 21 includes a VOC sensor and a detection chamber, the detection chamber having a detection inlet and a detection outlet, with the VOC sensor located inside the detection chamber. The VOC sensor can communicate with the control unit 80, which can compare the detection result of the VOC sensor with a preset value to determine whether the tested item 200 has leakage based on the detection result.

[0108] The working principle of a VOC detector is briefly explained below.

[0109] Please refer to Figure 7 In the ionization chamber 211 of the VOC detector, VOC molecules are ionized by high-energy photons emitted by the ultraviolet lamp 214. A DC power supply 215 is applied between the first electrode 212 and the second electrode 213, generating an electric field between them. Under the influence of this bias electric field, electrons and VOC ions separate, and an extremely weak ion stream is collected. After filtering, multi-stage amplification, and linear processing, the stream is converted into a concentration-related analog signal. The presence of leakage is then determined by comparing the gas concentration value with a preset value. If the gas concentration value is lower than the preset value, no leakage is detected; if the gas concentration value is greater than or equal to the preset value, leakage is detected.

[0110] After negative pressure is drawn into the placement chamber 11 and maintained for a period of time, the first valve 61 and the gas supply mechanism 30 can be opened, allowing the first detection mechanism 21 to detect the concentration of volatiles to determine whether there is a leak. When the concentration of volatiles is lower than the preset value, there is no leak; when the concentration of volatiles is greater than or equal to the preset value, there is a leak.

[0111] In some embodiments, please refer to Figure 2The detection component 20 includes a second detection mechanism 22, and the leakage detection device 100 also includes a second connecting flow path 70. One end of the second connecting flow path 70 is connected to the placement chamber 11. The second detection mechanism 22 has a detection inlet, and the other end of the second connecting flow path 70 is connected to the detection inlet. The second connecting flow path 70 includes a second valve 71, which is used to open or close the second connecting flow path 70. The second detection mechanism 22 is used to detect the concentration of different components of the volatile matter.

[0112] Optionally, the second detection mechanism 22 can be integrated with the placement chamber 11, and the detection inlet of the placement chamber 11 and the second detection mechanism 22 are connected through the second valve 71.

[0113] The second testing institution 22 includes, but is not limited to, a triple quadrupole mass spectrometer or an online residual gas analyzer.

[0114] The following explanation uses the second testing institution 22, which is a triple quadrupole mass spectrometer, as an example to illustrate the testing principle and process.

[0115] Please refer to Figure 8 The second detection mechanism 22 includes an ion source, a mass analyzer 226, a detector 225, and a vacuum system (not shown in the figure). The ion source includes a filament 221, an electron receiver 222, a focusing lens 224, and an ionization chamber 223. The ion source is used to emit electrons. The electron receiver 222 is used to collect electrons. The gas to be detected collides and is ionized in the ionization chamber 223, causing the ions to be focused into an ion beam by the focusing lens 224. The ion beam passes through the mass analyzer 226, which is a quadrupole formed by four parallel cylindrical rods. There are three sets of quadrupoles. In the same quadrupole, two diagonally opposite cylindrical rods have the same voltage, while the voltages of two adjacent cylindrical rods are opposite. After the ions enter the electric field formed by the quadrupole, only ions with a specific mass-to-charge ratio (m / z) can oscillate stably in the electric field and pass through the quadrupole. Other ions will collide with the cylindrical rods to achieve ion screening. Detector 225 receives ions passing through the quadrupole and converts them into electrical signals. Common detectors 225 include Faraday cups and electron multipliers. The vacuum system provides a high-vacuum environment to ensure that ions are accelerated and detected without colliding with other molecules. During detection, the ionized ion beam sequentially enters a triple quadrupole. The first quadrupole Q1 selects ions with a specific mass-to-charge ratio and excludes other interfering ions. The second quadrupole Q2 acts as a collision cell to induce collision-induced dissociation of the selected precursor ions, generating fragment ions. The third quadrupole Q3 selects specific fragment ions to enter detector 225 for mass spectrometry analysis.

[0116] Triple quadrupole mass spectrometers have the following advantages:

[0117] (1) By selecting the multiple reaction monitoring mode, specific precursor ions and daughter ion pairs can be selected for monitoring, achieving highly sensitive and specific quantitative analysis, and enabling the detection of low concentrations of target compounds.

[0118] (2) It can perform multi-level mass spectrometry analysis, providing more detailed and richer structural information, which is suitable for the analysis of complex samples and improves accuracy.

[0119] (3) It can perform multiple scanning modes, such as daughter ion scanning, precursor ion scanning, and neutral loss scanning. Daughter ion scanning is used for structural identification by fixing the precursor ion and scanning all possible daughter ions. Precursor ion scanning is used for identifying precursor ions by fixing the daughter ion and scanning all possible precursor ions. Neutral loss scanning is used for metabolite analysis by detecting ion pairs with specific mass differences.

[0120] Compared to a single-stage quadrupole mass spectrometer, the triple quadrupole mass spectrometer offers higher screening accuracy, primarily in the following aspects:

[0121] 1. Multi-stage screening mechanism: The triple quadrupole mass spectrometer uses two-stage mass selectors, Q1 and Q3, to screen ions. Q1 is used to select specific precursor ions, and Q3 is used to select specific daughter ions. This dual screening mechanism can effectively eliminate background interference ions, significantly improving the selectivity and detection sensitivity of target ions.

[0122] 2. Collision-Induced Dissociation (CID): In the Q2 collision cell, the selected parent ion undergoes collision-induced dissociation (CID) with a collision gas (such as nitrogen), generating characteristic fragment ions. By screening for specific fragment ions in Q3, specific detection of the target compound can be achieved. This selective detection of fragment ions further improves the sensitivity and selectivity of the analysis.

[0123] 3. Multiple Reaction Monitoring (MRM) Mode: The MRM mode, commonly used in triple quadrupole mass spectrometers, can simultaneously monitor multiple precursor ion-daughter ion pairs. Compared to the single-stage scanning mode of a single-stage quadrupole mass spectrometer, the MRM mode can simultaneously perform quantitative analysis of multiple target compounds and has a higher signal-to-noise ratio and sensitivity.

[0124] 4. High resolution and high sensitivity: The triple quadrupole mass spectrometer effectively improves the signal-to-noise ratio by continuously filtering irrelevant ions. Furthermore, its multi-stage screening mechanism enables more precise separation of target ions, thereby achieving higher resolution and sensitivity.

[0125] 5. Structural Confirmation Capability: Triple quadrupole mass spectrometers not only provide quantitative analysis but also enable structural confirmation through fragment ion information generated by CID. This combination of qualitative and quantitative capabilities gives it a significant advantage in the analysis of complex samples.

[0126] In summary, compared to single-stage quadrupole mass spectrometers, triple quadrupole mass spectrometers offer higher screening accuracy: through two-stage mass screening and collision-induced dissociation (CID), triple quadrupole mass spectrometers can more accurately separate target ions, resulting in higher screening accuracy compared to single-stage quadrupole mass spectrometers. Higher sensitivity: Due to the multi-stage screening mechanism and collision-induced dissociation, triple quadrupole mass spectrometers exhibit higher sensitivity in the analysis of low-concentration samples. Greater selectivity: Triple quadrupole mass spectrometers, through MRM mode, can simultaneously monitor multiple target compounds and effectively suppress background interference, resulting in higher selectivity.

[0127] The triple quadrupole mass spectrometer can screen ions with different mass-to-charge ratios (m / z). DMC (dimethyl carbonate), a common component in electrolytes, has a mass-to-charge ratio (m / z) of 59. Assuming DMC ions are captured, the mass analyzer 226 will only allow ions with a mass-to-charge ratio (m / z) of 59 to pass helically through the quadrupole; other ions will collide with the electrodes and be filtered out. Detection of multiple components (mainly organic components such as DMC, DEC, EMC, and PP, as well as decomposition products of fluoropolymers and organic acid derivatives) is performed as above / selecting the full-spectrum scan mode. The quadrupole detection accuracy is 1 × 10⁻⁶. -7 Pa﹒ m 3 / s, triple quadrupole is 1×10 -12 Pa﹒ m 3 / s.

[0128] Example 2:

[0129] When analyzing a compound, Q1 is set to allow only the parent ion with m / z 311 to pass through. The parent ion with m / z 311 enters Q2, collides with nitrogen gas, and breaks into multiple daughter ions, such as those with m / z 281 and 187. Q3 is set to allow only the daughter ion with m / z 281 to pass through, for quantitative and structural analysis. A conventional quadrupole can only quantitatively analyze ions with m / z 311 and cannot further distinguish ions with m / z 281 and 187 for structural analysis. For quality control during battery production, composition analysis after leakage, and process traceability analysis, a triple quadrupole can achieve high precision, high sensitivity, simultaneous multi-component analysis, and strong anti-interference capabilities.

[0130] Example 3:

[0131] Lithium-ion battery leakage detection: Leakage was detected using a triple quadrupole method, with m / z = 147.9 (mother ion LiPF6) → 88.9 (daughter ion POF6). 4 - →39.0 (Family ion HF) 2-The presence of m / z = 89.0 (mother ion) → 61.0 (daughter ion EC) confirms electrolyte leakage. The detection of m / z = 20.0 → 20.0 (F-) indicates that LiPF6 has hydrolyzed to generate HF, requiring immediate attention.

[0132] Example 4:

[0133] Fuel cell proton exchange membrane leakage; target analyte: sulfonic acid groups (such as Nafion decomposition products) leaking from the proton exchange membrane. MRM ion pair: parent ion m / z = 299 (sulfonate), daughter ion m / z = 80 (SO₄²⁻). - m / z = 80 (SO) was detected. - This indicates that a proton exchange membrane leak has occurred.

[0134] The second testing unit 22 can determine whether the tested component 200 is leaking by detecting the concentration of different components of the volatile matter, and can also analyze the composition of the leaked liquid from the tested component 200. Taking a battery as an example, by detecting the composition of the leaked electrolyte, the chemical reaction occurring inside the battery can be analyzed to understand the battery's performance. During testing, the second valve 71 is opened to allow the volatile matter to enter the testing inlet for detection.

[0135] In some embodiments, please refer to Figure 4 and Figure 5 The detection component 20 includes a first detection mechanism 21 and a second detection mechanism 22. The leakage detection device 100 also includes a connecting flow path 50, which has an air inlet, a first exhaust port, and a second exhaust port. The air inlet is connected to the placement chamber 11. The detection inlet includes a first detection inlet and a second detection inlet. The first detection mechanism 21 has a first detection inlet, and the second detection mechanism 22 has a second detection inlet. The first exhaust port is connected to the first detection inlet, and the second exhaust port is connected to the second detection inlet. The connecting flow path 50 includes a switching mechanism 54, which is used to connect or disconnect at least one of the first exhaust port and the second exhaust port from the air inlet. The first detection mechanism 21 is used to detect the total concentration of volatiles, and the second detection mechanism 22 is used to detect the concentration of different components of volatiles.

[0136] Therefore, by adjusting the switching mechanism 54, the first detection inlet and / or the second detection inlet can be connected to the air inlet, so that the first detection mechanism 21 and / or the second detection mechanism 22 can detect the leaked liquid in the test piece 200 to meet different usage requirements.

[0137] In some embodiments, please refer to Figure 4The switching mechanism 54 is a switching valve 541. The connecting flow path 50 includes a main flow path 51, a first branch path 52 and a second branch path 53. The first branch path 52 and the second branch path 53 are respectively connected to the main flow path 51. The main flow path 51 has an air inlet. The first branch path 52 has a first exhaust port and the second branch path 53 has a second exhaust port. The first branch path 52 and the second branch path 53 are respectively provided with switching valves 541. The switching valve 541 provided in the first branch path 52 is used to connect or disconnect the air inlet and the first exhaust port. The switching valve 541 provided in the second branch path 53 is used to connect or disconnect the air inlet and the second exhaust port.

[0138] By adjusting different switching valves 541, the first detection mechanism 21 and / or the second detection mechanism 22 can detect the leaked liquid in the test piece 200 to meet different usage requirements.

[0139] In some embodiments, please refer to Figure 5 The connecting flow path 50 includes a main flow path 51, a first branch path 52, and a second branch path 53. The first branch path 52 and the second branch path 53 are respectively connected to the main flow path 51. The main flow path 51 has an air inlet, the first branch path 52 has a first exhaust port, and the second branch path 53 has a second exhaust port. The switching mechanism 54 has a flow inlet, a first flow outlet, and a second flow outlet. The main flow path 51 is connected to the flow inlet, the first flow outlet is connected to the first branch path 52, and the second flow outlet is connected to the second branch path 53.

[0140] Therefore, by adjusting the switching mechanism 54, the inlet can be connected to the first outlet, or the inlet can be connected to the second outlet. Then, the first detection mechanism 21 or the second detection mechanism 22 can be used to detect whether the test piece 200 is leaking, so as to facilitate subsequent qualitative or quantitative analysis of the leaked liquid.

[0141] In some embodiments, the switching mechanism 54 includes either a solenoid valve or an electric valve.

[0142] Therefore, by adjusting the position of the solenoid valve or electric valve, the inlet can be connected to the first outlet, or the inlet can be connected to the second outlet.

[0143] In some embodiments, please refer to Figure 3 The leakage detection device 100 also includes a control unit 80, and at least one of the switching mechanism 54, the detection component 20 and the gas supply mechanism 30 is communicatively connected to the control unit 80.

[0144] Specifically, the control unit 80 can communicate with the air supply valve 31 of the air supply mechanism 30, and can also communicate with at least one of the first detection mechanism 21 and the second detection mechanism 22.

[0145] In one example, the control unit 80, the first detection mechanism 21, and the placement chamber 11 are integrated together to form a separate mass spectrometry detection device.

[0146] When the control unit 80 is connected to the switching mechanism 54, the control unit 80 can adjust the switching mechanism 54 according to the received instructions, which is more convenient than manually adjusting the switching mechanism 54. When the control unit 80 is connected to the detection component 20, the control unit 80 can judge the detection results of the detection component 20 to determine whether the component under test 200 is leaking. Specifically, if the concentration of volatiles is lower than a preset value, it is determined that the component under test 200 is not leaking; if the concentration of volatiles is greater than or equal to the preset value, it is determined that the component under test 200 is leaking. When the control unit 80 is connected to the gas supply mechanism 30, it is more convenient than manually opening or closing the gas supply mechanism 30.

[0147] In some embodiments, please refer to Figure 3 The leakage detection device 100 also includes an alarm mechanism 90, which is communicatively connected to the control unit 80. When the placement chamber 11 is in a clean state, the alarm mechanism 90 is used to issue an alarm when the residual volatiles in the placement chamber 11 reach a set value.

[0148] The alarm mechanism 90 can be one or more combinations of an alarm or an alarm light. After cleaning, the detection component 20 can be opened, and cleaning gas can be introduced into the placement chamber 11 to detect residual volatiles in the placement chamber 11. When the concentration of the detected residual volatiles is lower than the set value, the next leakage detection of the component 200 can be performed; otherwise, a second cleaning is performed until the concentration of volatiles is lower than the set value.

[0149] Therefore, the cleaning results can be tested. If the cleaning results are unsatisfactory, the alarm mechanism 90 will issue an alarm prompt to perform a second cleaning until the residual volatiles in the placement chamber 11 are below the set value. Thus, multiple cleanings can be conveniently performed based on the prompts from the alarm mechanism 90.

[0150] For ease of explanation, the following embodiments use a battery production system from some embodiments of this application as an example.

[0151] The battery production system includes the leakage detection device 100 of the above embodiment, and the component to be tested 200 is a single battery cell.

[0152] The number of battery cells placed in the chamber 11 can be one or more.

[0153] Since the battery production system includes all the technical features of the leakage detection device 100 of the above embodiments, its effect is the same as described above, and will not be repeated here.

[0154] In one specific alternative embodiment of the leak detection device, please refer to Figure 3 The leakage detection device 100 includes a gas collection component 10, a detection component 20, a connecting flow path 50, a control unit 80, an alarm mechanism 90, and a gas supply mechanism 30.

[0155] The gas collection component 10 includes a placement chamber 11, a negative pressure assembly 40, a nozzle 13, a first opening and closing mechanism 12, and an exhaust port 111 communicating with the placement chamber 11. The first opening and closing mechanism 12, used to open or close the exhaust port 111, is externally connected to the placement chamber 11. The placement chamber 11 is configured to hold a test piece 200, which is a battery cell, and is configured to draw negative pressure. The first opening and closing mechanism 12 is an on / off valve. The nozzle 13 is located inside the placement chamber 11 and communicates with the gas outlet. The nozzle 13 is used to purge the inner surface of the placement chamber 11. A booster pump is externally connected to the placement chamber 11, used to deliver the gas to be tested into the detection component 20 for detection.

[0156] The detection component 20 and the gas supply mechanism 30 are located outside the placement chamber 11, respectively. The detection component 20 includes a first detection mechanism 21 and a second detection mechanism 22. The first detection mechanism 21 is a VOC detector, and the second detection mechanism 22 is a triple quadrupole mass spectrometer. The detection component 20 has a detection inlet, which includes a first detection inlet and a second detection inlet.

[0157] The gas supply mechanism 30 has a gas outlet end that communicates with the placement chamber 11. The gas supply mechanism 30 also includes a gas storage container 32, a gas supply path 33, and a gas supply valve 31. The gas storage container 32 communicates with the placement chamber 11 via the gas supply path 33, and the gas supply valve 31 is located in the gas supply path 33. The gas storage container 32 is used to store compressed clean gas. The gas supply mechanism 30 is configured to introduce clean gas into the placement chamber 11 before negative pressure is drawn into the placement chamber 11.

[0158] The negative pressure assembly 40 has an intake end that communicates with the placement chamber 11. The negative pressure assembly 40 includes a vacuum pumping mechanism 41 and a negative pressure on / off valve 42. The vacuum pumping mechanism 41 has a first inlet port and a first outlet port, and the negative pressure on / off valve 42 has a second inlet port and a second outlet port. The first inlet port and the second outlet port are connected. The vacuum pumping mechanism 41 is a vacuum pump.

[0159] The connecting flow path 50 has an air inlet, a first exhaust port, and a second exhaust port. The air inlet is connected to the placement chamber 11. The detection inlet includes a first detection inlet and a second detection inlet. The first detection mechanism 21 has a first detection inlet, and the second detection mechanism 22 has a second detection inlet. The first exhaust port is connected to the first detection inlet, and the second exhaust port is connected to the second detection inlet. The connecting flow path 50 includes a switching mechanism 54, which is used to connect or disconnect at least one of the first exhaust port and the second exhaust port from the air inlet. The first detection mechanism 21 is used to detect the total concentration of volatiles, and the second detection mechanism 22 is used to detect the concentration of different components of volatiles. The switching mechanism 54 is a switching valve 541. The connecting flow path 50 includes a main flow path 51, a first branch path 52, and a second branch path 53. The first branch path 52 and the second branch path 53 are respectively connected to the main flow path 51. The main flow path 51 has an air inlet, the first branch path 52 has a first exhaust port, and the second branch path 53 has a second exhaust port. The first branch path 52 and the second branch path 53 are respectively equipped with switching valves 541. The switching valve 541 on the first branch path 52 is used to connect or disconnect the air inlet and the first exhaust port, and the switching valve 541 on the second branch path 53 is used to connect or disconnect the air inlet and the second exhaust port. The control unit 80 is communicatively connected to the switching valve 541, the air supply valve 31, the first opening and closing mechanism 12, the first detection mechanism 21, and the second detection mechanism 22.

[0160] The leakage detection device 100 also includes an alarm mechanism 90, which is communicatively connected to the control unit 80. When the placement chamber 11 is in a clean state, the alarm mechanism 90 is used to issue an alarm when the residual volatiles in the placement chamber 11 reach a set value.

[0161] Before testing, the first opening / closing mechanism 12 and the air supply valve 31 can be opened to purge the inner surface of the placement chamber 11 through the nozzle 13. After purging, the switching valve 541 located in the first branch 52 can be opened, and the first detection mechanism 21 can detect the residual volatiles in the placement chamber 11. Cleaning ends when the residual volatiles are lower than a set value. The set value can be 50 μg / L. The first opening / closing mechanism 12, the switching valve 541, and the air supply valve 31 are all closed, with the switching valve 541 remaining closed. The vacuuming mechanism 41 creates negative pressure in the placement chamber 11, allowing the electrolyte on the surface of the battery cell to evaporate if there is electrolyte leakage. When the first opening / closing mechanism 12 is opened, the first detection mechanism 21 can be used to detect the total concentration of volatiles. If the detected concentration of volatiles is lower than the preset value, it is determined that the battery cell does not leak; otherwise, it is determined that the battery cell does leak. When the switching valve 541 located in the second branch 53 is opened, the concentration of different components of the volatiles can be detected by the second detection mechanism 22. When the concentration of different components detected is lower than the preset value, it can be determined that there is no leakage in the battery cell. Conversely, there is leakage.

[0162] Before or after the previous test, the gas supply mechanism 30 introduces clean gas (gas free of electrolyte components) into the placement chamber 11 to purge it. This allows gases affecting the test results (gas containing electrolyte components) to be discharged from the exhaust port 111. Then, the first opening and closing mechanism 12 is closed, drawing the placement chamber 11 to a negative pressure state. When electrolyte leaks, it evaporates into volatiles under negative pressure. The concentration of these volatiles is detected by the detection component 20. If the concentration reaches a target value, electrolyte leakage in the battery is confirmed; otherwise, no leakage is detected. Therefore, introducing clean gas into the placement chamber 11 through the gas supply mechanism 30 can reduce the impact on test results and improve test accuracy.

[0163] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A leakage detection device, characterized in that, include: A gas collection component includes a placement chamber, a first opening and closing mechanism, and an exhaust port communicating with the placement chamber. The first opening and closing mechanism for opening or closing the exhaust port is connected to the outside of the placement chamber. The placement chamber is configured to place the test piece and is configured to draw negative pressure. A detection component is located outside the placement chamber. The detection component has a detection inlet configured to communicate with the placement chamber. The detection component is used to detect the concentration of volatiles in the test item. A gas supply mechanism is located outside the placement chamber. The gas supply mechanism has a gas outlet end that communicates with the placement chamber. The gas supply mechanism has an open state for supplying clean gas to the placement chamber and a closed state for stopping the supply of clean gas to the placement chamber. The gas supply mechanism is configured to supply clean gas to the placement chamber before drawing negative pressure into the placement chamber.

2. The leakage detection device according to claim 1, characterized in that, The gas supply mechanism includes a gas supply valve, which has an open state and a closed state.

3. The leakage detection device according to claim 2, characterized in that, The gas supply mechanism also includes a gas storage container, which is connected to the gas inlet of the gas supply valve, and is used to store the compressed clean gas.

4. The leakage detection device according to claim 3, characterized in that, The gas supply mechanism further includes a gas supply path, through which the gas storage container is connected to the gas inlet end; and / or, through which the gas supply valve is connected to the placement chamber.

5. The leakage detection device according to claim 1, characterized in that, The gas collection component also includes a nozzle located in the placement chamber and connected to the gas outlet. The nozzle is used to purge the inner surface of the placement chamber.

6. The leakage detection device according to any one of claims 1-5, characterized in that, The first opening and closing mechanism includes an opening and closing valve.

7. The leakage detection device according to any one of claims 1-5, characterized in that, The gas collection component further includes a negative pressure assembly located outside the placement chamber. The negative pressure assembly has an intake end that communicates with the placement chamber. The negative pressure assembly includes a vacuum mechanism and a negative pressure on / off valve. The vacuum mechanism has a first inlet port and a first outlet port, and the negative pressure on / off valve has a second inlet port and a second outlet port. The first air inlet port is connected to the second air outlet port, or the first air outlet port is connected to the second air inlet port.

8. The leakage detection device according to any one of claims 1-5, characterized in that, The detection component includes a first detection mechanism, and the leakage detection device further includes a first connecting flow path. One end of the first connecting flow path is connected to the placement chamber. The first detection mechanism has the detection inlet, and the other end of the first connecting flow path is connected to the detection inlet. The first connecting flow path includes a first valve, which is used to open or close the first connecting flow path. The first detection mechanism is used to detect the total concentration of the volatiles.

9. The leakage detection device according to any one of claims 1-5, characterized in that, The detection component includes a second detection mechanism, and the leakage detection device further includes a second connecting flow path. One end of the second connecting flow path is connected to the placement chamber. The second detection mechanism has the detection inlet, and the other end of the second connecting flow path is connected to the detection inlet. The second connecting flow path includes a second valve, which is used to open or close the second connecting flow path. The second detection mechanism is used to detect the concentration of different components of the volatile matter.

10. The leakage detection device according to any one of claims 1-5, characterized in that, The detection components include a first detection mechanism, a second detection mechanism, and a detection mechanism for a second air supply valve. The leakage detection device further includes a connecting flow path, which has an air inlet, a first exhaust port, and a second exhaust port. The air inlet is connected to the placement chamber. The detection inlet includes a first detection inlet and a second detection inlet. The first detection mechanism has the first detection inlet, and the second detection mechanism has the second detection inlet. The first exhaust port is connected to the first detection inlet, and the second exhaust port is connected to the second detection inlet. The connecting flow path includes a switching mechanism, which is used to connect or disconnect at least one of the first exhaust port and the second exhaust port from the air inlet. The first detection mechanism is used to detect the total concentration of the volatiles, and the second detection mechanism is used to detect the concentrations of different components of the volatiles.

11. The leakage detection device according to claim 10, characterized in that, The switching mechanism is a switching valve. The connecting flow path includes a main flow path, a first branch path, and a second branch path. The first branch path and the second branch path are respectively connected to the main flow path. The main flow path has the air inlet. The first branch path has the first exhaust port. The second branch path has the second exhaust port. The first branch path and the second branch path are respectively provided with the switching valve. The switching valve provided in the first branch path is used to connect or disconnect the air inlet path and the first exhaust port. The switching valve provided in the second branch path is used to connect or disconnect the air inlet path and the second exhaust port. And / or, the first detection mechanism includes a volatile organic compound detector.

12. The leakage detection device according to claim 10, characterized in that, The connecting flow path includes a main flow path, a first branch gas supply mechanism, and a second branch. The first branch and the second branch are respectively connected to the main flow path. The main flow path has the air inlet, the first branch has the first exhaust port, and the second branch has the second exhaust port. The switching mechanism has a flow inlet, a first flow outlet, and a second flow outlet. The main flow path is connected to the flow inlet, the first flow outlet is connected to the first branch, and the second flow outlet is connected to the second branch.

13. The leakage detection device according to claim 12, characterized in that, The switching mechanism includes either a solenoid valve or an electric valve; and / or, the second detection mechanism includes a triple quadrupole mass spectrometer.

14. The leakage detection device according to claim 10, characterized in that, The leakage detection device further includes a control unit, and at least one of the switching mechanism, the detection component, and the gas supply mechanism is communicatively connected to the control unit.

15. The leakage detection device according to claim 14, characterized in that, The leakage detection device also includes an alarm mechanism, which is communicatively connected to the control unit. When the placement chamber is in a clean state, the alarm mechanism is used to issue an alarm when the amount of volatile matter remaining in the placement chamber reaches a set value.

16. A battery production system, characterized in that, The device includes the leakage detection device as described in any one of claims 1-15, wherein the component to be detected is a single battery cell.

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