Leak detection device

Abstract

The present application relates to a kind of leak detection devices, including sealed box, first detection component and second detection component.Specifically, the sealed box has a sealed cavity for accommodating workpieces;Both the first detection component and the second detection component include a communication state, a detection state and an exhaust state.A battery is placed in the sealed cavity, first detection component is switched to the communication state, and second detection component is switched to the exhaust state, the sealed cavity is pumped by a vacuum pump, and then first detection component is switched to the detection state to detect whether volatile gas exists in the sealed cavity, thereby determining whether the battery has leaked or not.When detecting another battery subsequently, first detection component can be switched to the exhaust state to exhaust residual gas, and the battery in the sealed cavity is detected by second detection component.Therefore, the first detection component and the second detection component can operate alternately, without waiting for the residual gas in the detection component to be exhausted, thereby improving the efficiency of leak detection.

Description

Technical Field

[0001] This invention relates to the field of battery testing technology, and in particular to a leak detection device. Background Technology

[0002] In lithium battery production lines, leak detection is required for pouch cells after liquid filling and final sealing. Leak detection is usually performed under vacuum conditions, but residual gas remains in the pipelines and sensors after vacuuming, affecting detection accuracy. Therefore, after the detection is completed, it is necessary to wait for the residual gas in the pipelines and sensors to be discharged, resulting in long sensor reset time and low efficiency in pouch cell leak detection. Summary of the Invention

[0003] Therefore, it is necessary to provide a leak detection device with high detection efficiency to address the problem of low efficiency in existing battery leak detection methods.

[0004] A leak detection device, comprising:

[0005] A sealed box having a sealed cavity for accommodating workpieces;

[0006] A first detection component, connected to the sealed box, is used to detect volatile gases emitted from the workpiece; and

[0007] The second detection component, connected to the sealed box, is used to detect the volatile gases emitted from the workpiece;

[0008] Both the first detection component and the second detection component include a connected state, a detection state, and an exhaust state;

[0009] When the first detection component or the second detection component is in the connected state, the first detection component or the second detection component connects the sealing cavity and the air extraction device;

[0010] When the first detection component or the second detection component is in the detection state, the first detection component or the second detection component is in communication with the sealed cavity and separated from the air extraction device;

[0011] When the first detection component or the second detection component is in the exhaust state, the first detection component or the second detection component is separated from the sealing cavity.

[0012] By setting up the aforementioned leak detection device, the battery is placed inside the sealed cavity. First, the first detection component is switched to the connected state, and the second detection component is switched to the venting state. A vacuum is then created in the sealed cavity using a vacuum pump. Next, the first detection component is switched to the detection state to detect the presence of volatile gases within the sealed cavity, thereby determining whether a battery leak has occurred. When testing another battery subsequently, the first detection component can be switched to the venting state to expel residual gases, and the second detection component can then be used to detect leaks in the sealed cavity. In this way, the first and second detection components can operate alternately without waiting for residual gases to be expelled, improving leak detection efficiency.

[0013] In one embodiment, the sealing box includes a base plate and a box body. The base plate is used to support the workpiece, and the box body is detachably connected to the base plate to form the sealing cavity. The first detection component and the second detection component are both connected to the box body.

[0014] In one embodiment, the leak detection device further includes a frame and a lifting drive component. The housing and the lifting drive component are both disposed on the frame, and the lifting drive component is connected to the base plate to drive the base plate to reciprocate along a first direction. The base plate has a sealing position during the movement.

[0015] When the base plate is in the sealed position, the base plate is connected to the housing to enclose and form the sealed cavity.

[0016] In one embodiment, the leak detection device further includes a translation drive component, which is disposed on the frame and is connected to the lifting drive component to drive the lifting drive component to reciprocate along a second direction perpendicular to the first direction. The lifting drive component has a corresponding position during the movement.

[0017] When the lifting drive is in the corresponding position, the base plate and the housing correspond in the first direction, so that the base plate can move in the first direction to the sealing position.

[0018] In one embodiment, the enclosure includes a transparent top panel and a side panel, one end of the side panel being fixedly connected to the transparent top panel, and the bottom panel being detachably connected to the other end of the side panel opposite to the transparent top panel.

[0019] In one embodiment, the leak detection device further includes a connecting component connected to the sealing box and communicating with the sealing cavity, the connecting component having a conducting state and a cut-off state;

[0020] When the connecting component is in the conducting state, the sealed cavity is connected to the outside through the connecting component;

[0021] When the connecting component is in the closed state, the connecting component separates the sealed cavity from the outside.

[0022] In one embodiment, the connection assembly includes a first connecting pipe and a first control valve. The first connecting pipe is connected to the sealing box and communicates with the sealing cavity. The first control valve is disposed on the first connecting pipe and is used to control the on / off state of the first connecting pipe.

[0023] In one embodiment, the first detection component includes a second connecting pipe, a second control valve, a third control valve, and a first detector. One end of the second connecting pipe is connected to the sealed box and communicates with the sealed cavity, while the other end is used to communicate with a vacuum device. The second control valve and the third control valve are both disposed on the second connecting pipe, with the second control valve located on the side of the third control valve closer to the sealed box. Both the second control valve and the third control valve are used to control the on / off state of the second connecting pipe. The first detector is disposed on the second connecting pipe and located between the second control valve and the third control valve, and is used to detect the volatile gases of the workpiece.

[0024] In one embodiment, the second detection component includes a third connecting pipe, a fourth control valve, a fifth control valve, and a second detector. One end of the third connecting pipe is connected to the sealed box and communicates with the sealed cavity, while the other end is used to communicate with a vacuum device. The fourth control valve and the fifth control valve are both disposed on the third connecting pipe, with the fourth control valve located on the side of the fifth control valve closer to the sealed box. Both the fourth and fifth control valves are used to control the on / off state of the third connecting pipe. The second detector is disposed on the third connecting pipe and located between the fourth and fifth control valves, and is used to detect the volatile gases of the workpiece.

[0025] In one embodiment, the leak detection device further includes a connecting pipe and a filter element. The connecting pipe is connected to the other end of the second connecting pipe away from the sealed box, the other end of the third connecting pipe away from the sealed box, and an air extraction device. The filter element is disposed in the connecting pipe for filtering the gas flowing through the connecting pipe. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a leak detection device provided in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 The diagram shows the left-side view of the leak detection device. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] like Figure 1 and Figure 2 As shown, a leak detection device 100 provided in one embodiment of the present invention includes a sealed box 10, a first detection component 20 and a second detection component 30.

[0036] The sealed box 10 has a sealed cavity for accommodating the workpiece 200. The first detection component 20 and the second detection component 30 are both connected to the sealed box 10 and are both used to detect the volatile gases of the workpiece 200. The first detection component 20 and the second detection component 30 each include a connected state, a detection state, and an exhaust state.

[0037] When the first detection component 20 or the second detection component 30 is in a connected state, the first detection component 20 or the second detection component 30 connects the sealed cavity and the air extraction device.

[0038] When the first detection component 20 or the second detection component 30 is in the detection state, the first detection component 20 or the second detection component 30 is in communication with the sealed cavity and separated from the air extraction device.

[0039] When the first detection component 20 or the second detection component 30 is in the exhaust state, the first detection component 20 or the second detection component 30 is separated from the sealing cavity.

[0040] It should be noted that in this embodiment, the workpiece 200 is a battery, and the volatile gas is the volatile gas of the electrolyte in the battery.

[0041] By setting up the aforementioned leak detection device, the battery is placed inside the sealed cavity. First, the first detection component 20 is switched to the connected state, and the second detection component 30 is switched to the venting state. A vacuum is then created in the sealed cavity using a vacuum pump. Next, the first detection component 20 is switched to the detection state to detect the presence of volatile gases within the sealed cavity, thereby determining whether a battery leak has occurred. When testing another battery subsequently, the first detection component 20 can be switched to the venting state to expel residual gases, and the second detection component 30 can be used to detect leaks in the sealed cavity. In this way, the first detection component 20 and the second detection component 30 can operate alternately without waiting for residual gases to be expelled from the detection components, thus improving leak detection efficiency.

[0042] It should be explained that when the first detection component 20 or the second detection component 30 is in the exhaust state, the first detection component 20 or the second detection component 30 is connected to the vacuum device but separated from the sealed cavity. Therefore, the vacuum device can be used to evacuate the first detection component 20 or the second detection component 30, thereby extracting the residual gas inside the first detection component 20 or the second detection component 30.

[0043] It can be determined that during the detection process of the first detection component 20, the second detection component 30 is in the exhaust state. The first detection component 20 and the second detection component 30 can operate alternately. Therefore, during the process of the second detection component 30 detecting the battery in the sealed cavity, the first detection component 20 is also always in the exhaust state, thereby expelling the residual gas in the first detection component 20.

[0044] The detection process of the second detection component 30 is the same as that of the first detection component 20. First, the second detection component 30 is switched to the connected state, and the sealed cavity is evacuated by the air extraction device. Then, the second detection component 30 is switched to the detection state to detect whether there is volatile gas in the sealed cavity.

[0045] Furthermore, it should be noted that in this embodiment, the first detection component 20 and the second detection component 30 are not connected to each other. The first detection component 20 and the second detection component 30 may be evacuated by two separate evacuation devices, or the first detection component 20 and the second detection component 30 may be connected to the same evacuation device in sequence, or they may be connected to the same evacuation device but do not interfere with each other.

[0046] In some embodiments, the sealed box 10 includes a base plate 11 and a box body 12. The base plate 11 is used to support the workpiece 200, and the box body 12 is detachably connected to the base plate 11 to form a sealed cavity with the base plate 11. The first detection component 20 and the second detection component 30 are both connected to the box body 12.

[0047] It should be noted that the base plate 11 is provided with a positioning structure. By removing the base plate 11 from the box 12, and then positioning the workpiece 200 on the base plate 11 through the positioning mechanism, and then connecting the base plate 11 to the box 12, the workpiece 200 can be placed in the sealed cavity.

[0048] In addition, a sealing ring is provided on the base plate 11 to ensure the sealing of the cavity.

[0049] In some embodiments, the housing 12 includes a transparent top plate and a side plate, one end of which is connected to the transparent top plate, and a bottom plate 11 is detachably connected to the other end of the side plate away from the transparent top plate, to enclose and form the aforementioned sealed cavity. Thus, when the sealed cavity is evacuated, the battery inside the sealed cavity can be observed through the transparent top plate to determine whether it has deformed, thereby directly judging the battery's sealing performance.

[0050] In some embodiments, the leak detection device further includes a vision component disposed on the side of the transparent top plate away from the bottom plate 11, for detecting the shape and size of the battery in the sealed cavity, thereby determining whether the battery has deformed during the vacuuming process of the sealed cavity based on the shape and size, and thus determining the sealing performance of the battery.

[0051] In some embodiments, the leak detection device further includes a frame 41 and a lifting drive 42. The housing 12 and the lifting drive 42 are both disposed on the frame 41, and the lifting drive 42 is connected to the base plate 11 in a transmission manner to drive the base plate 11 to reciprocate along a first direction. The base plate 11 has a sealing position during the movement.

[0052] When the base plate 11 is in the sealed position, the base plate 11 is connected to the housing 12 to form a sealed cavity.

[0053] The first direction is Figure 1 and Figure 2 The vertical direction is the same as the vertical direction in practical applications.

[0054] Specifically, the lifting drive component 42 is a cylinder.

[0055] In some embodiments, the leak detection device further includes a translation drive 43, which is disposed on the frame 41 and is connected to the lifting drive 42 for transmission, so as to drive the lifting drive 42 to reciprocate along the second direction, and the lifting drive 42 has a corresponding position during the movement.

[0056] When the lifting drive component 42 is in the corresponding position, the base plate 11 corresponds to the housing 12 in the first direction, so that the base plate 11 can move along the first direction to the sealing position and connect with the housing 12 to form a sealed cavity.

[0057] Wherein, the second direction is perpendicular to the first direction, and the second direction is Figure 1 The direction perpendicular to the paper, and is Figure 2 The left and right directions in the middle.

[0058] Understandably, the translation drive 43 drives the lifting drive 42 to move away from the corresponding position along the second direction, so that the bottom plate 11 moves out from directly below the box 12, and the battery is placed on the bottom plate 11. Then, the translation drive 43 drives the lifting drive 42 to move back to the corresponding position, and then the lifting drive 42 drives the bottom plate 11 to rise to connect with the box 12, thereby enclosing and forming a sealed cavity, and the battery is located in the sealed cavity.

[0059] Specifically, the translation drive 43 is an electric cylinder or a pneumatic cylinder.

[0060] In some embodiments, the leak detection device further includes a connection component 50, which is connected to the sealing box 10 and communicates with the sealing cavity. The connection component 50 includes a conducting state and a cut-off state.

[0061] When the connecting component 50 is in the conducting state, the sealed cavity is connected to the outside world through the connecting component 50; when the connecting component 50 is in the closed state, the connecting component 50 separates the sealed cavity from the outside world.

[0062] The following explanation uses the first detection component 20 to perform leak detection on the workpiece 200 as an example:

[0063] The connecting component 50 is initially in the off state, while the first detection component 20 enters the connected state. The vacuum device evacuates the sealed cavity, and after evacuation, the first detection component 20 enters the detection state. After detection, when it is necessary to break the vacuum in the sealed cavity to facilitate the separation of the housing 12 and the bottom plate 11, the connecting component 50 enters the conducting state to break the vacuum in the sealed cavity. At the same time, the first detection component 20 enters the connected state, and the vacuum device operates to exhaust air from the sealed cavity and the first detection component 20. After exhausting air, the first detection component 20 is switched to the exhaust state, and the vacuum device evacuates the first detection component 20 to further exhaust air from it.

[0064] In practical applications, the connecting assembly 50 includes a first connecting pipe 51 and a first control valve 52. The first connecting pipe 51 is connected to the sealing box 10 and communicates with the sealing cavity. The first control valve 52 is located on the first connecting pipe 51 and is used to control the opening and closing of the first connecting pipe 51.

[0065] In other words, when the first control valve 52 is open, the connecting component 50 is in a conducting state, and when the first control valve 52 is closed, the connecting component 50 is in a cut-off state.

[0066] Meanwhile, it should be noted that without the connection component 50, after the test is completed, the vacuum in the sealed cavity can be broken by switching the first detection component 20 or the second detection component 30 to the connected state. After breaking the vacuum, the bottom plate 11 is separated from the box 12, and then the first detection component 20 or the second detection component 30 is switched to the exhaust state, and the vacuum device is used to evacuate the first detection component 20 or the second detection component 30.

[0067] In some embodiments, the first detection component 20 includes a second connecting pipe 21, a second control valve 22, a third control valve 23, and a first detector 24. One end of the second connecting pipe 21 is connected to the sealing box 10 and communicates with the sealing cavity, while the other end is used to communicate with the air extraction device. The second control valve 22 and the third control valve 23 are both disposed on the second connecting pipe 21, with the second control valve 22 located on the side of the third control valve 23 closer to the sealing box 10. Both the second control valve 22 and the third control valve 23 are used to control the opening and closing of the second connecting pipe 21. The first detector 24 is disposed on the second connecting pipe 21 and located between the second control valve 22 and the third control valve 23, and is used to detect the volatile gases of the workpiece 200.

[0068] Assume that the space between the second control valve 22 and the third control valve 23 inside the second connecting pipe 21 is the detection space, and the first detector 24 is located in the detection space.

[0069] It should be explained that when the first detection component 20 is in the connected state, both the second control valve 22 and the third control valve 23 are open, and the vacuum device is connected to the sealing cavity through the second connecting pipe 21, thereby evacuating the sealing cavity.

[0070] When the first detection component 20 is in the detection state, the second control valve 22 is opened and the third control valve 23 is closed. The detection space is connected to the sealed cavity and separated from the air extraction device. The first detector 24 can detect whether there is volatile gas from the battery in the sealed cavity.

[0071] When the first detection component 20 is in the exhaust state, the second control valve 22 is closed and the third control valve 23 is opened. The detection space is separated from the sealed cavity, but connected to the vacuum pump. The vacuum pump evacuates the detection space to remove the residual gas in the detection space.

[0072] In some embodiments, the second detection component 30 includes a third connecting pipe 31, a fourth control valve 32, a fifth control valve 33, and a second detector 34. One end of the third connecting pipe 31 is connected to the sealing box 10 and communicates with the sealing cavity, while the other end is used to communicate with the air extraction device. The fourth control valve 32 and the fifth control valve 33 are both disposed on the third connecting pipe 31, with the fourth control valve 32 located on the side of the fifth control valve 33 closer to the sealing box 10. Both the fourth control valve 32 and the fifth control valve 33 are used to control the opening and closing of the third connecting pipe 31. The second detector 34 is disposed on the third connecting pipe 31 and located between the fourth control valve 32 and the fifth control valve 33, and is used to detect the volatile gases of the workpiece 200.

[0073] Since the structure of the second detection component 30 is the same as that of the first detection component 20, it can be inferred that when the second detection component 30 is in the connected state, both the fourth control valve 32 and the fifth control valve 33 are open; when the second detection component 30 is in the detection state, the fourth control valve 32 is open and the fifth control valve 33 is closed; when the second detection component 30 is in the exhaust state, the fourth control valve 32 is closed and the fifth control valve 33 is open.

[0074] In some embodiments, both the first detector 24 and the second detector 34 are odor sensors. The internal medium of the odor sensor reacts with the volatile gas of the electrolyte and outputs a voltage value. The system then determines whether the battery is leaking based on the fluctuation range of the voltage value.

[0075] In some embodiments, the leak detection device further includes a connecting pipe 60, which is connected to the other end of the second connecting pipe 21 away from the sealing box 10, the other end of the third connecting pipe 31 away from the sealing box 10, and the air extraction device.

[0076] In this embodiment, the first detection component 20 and the second detection component 30 are connected by a connecting pipe 60, which can be connected to a vacuuming device to reduce vacuuming costs. Additionally, in this embodiment, both the first detection component 20 and the second detection component 30 also include a disconnected state.

[0077] When the first detection component 20 or the second detection component 30 is in the disconnected state, the first detection component 20 or the second detection component 30 is separated from the sealing cavity and the air extraction device to avoid mutual interference when the first detection component 20 and the second detection component 30 are detecting.

[0078] It is also understood that when the first detection component 20 detects the workpiece 200, the second detection component 30 is in a disconnected state; similarly, when the second detection component 30 detects the workpiece 200, the first detection component 20 is in a disconnected state.

[0079] In some embodiments, the leak detection device further includes a filter element disposed in the connecting pipe 60 for filtering gas flowing through the connecting pipe 60 to filter volatile electrolyte.

[0080] To facilitate understanding of the technical solution of this invention, it is combined with... Figure 1 The detection process of the first detection component 20 in the above embodiments will be described as follows:

[0081] Initially, the base plate 11 is connected to the housing 12, there is no battery in the sealed cavity, and the first control valve 52, the second control valve 22, the third control valve 23, the fourth control valve 32 and the fifth control valve 33 are all closed.

[0082] First, the lifting drive 42 drives the base plate 11 to descend. Then, the translation drive 43 drives the lifting drive 42 to move out of the corresponding position. The robot places the battery on the base plate 11, and the positioning structure fixes the battery. Then, the translation drive 43 drives the lifting drive 42 to move to the corresponding position. The lifting drive 42 then drives the base plate 11 to rise until it connects with the box 12, forming a sealed cavity.

[0083] After the base plate 11 is connected to the housing 12, the second control valve 22 and the third control valve 23 are opened, the vacuum device is activated, and the sealed cavity is evacuated. During the vacuuming process, the battery can be detected by the vision component to see if it has deformed. If no deformation has occurred, the subsequent operation continues.

[0084] After the vacuum level meets the requirements, the pumping device and the third control valve 23 are closed. The first detector 24 detects whether there is volatile gas in the sealed cavity. After the detection is completed, the first control valve 52 and the third control valve 23 are opened. At the same time, the pumping device is activated to break the vacuum in the sealed cavity and replace the gas in the sealed cavity and the second connecting pipe 21.

[0085] Next, the first control valve 52 and the second control valve 22 are closed. The suction device extracts the gas from the detection space to allow the residual gas in the detection space to be discharged. After the residual gas is discharged, the third control valve 23 and the suction device are closed. Then, the lifting drive 42 drives the base plate 11 to descend, and the translation drive 43 drives the lifting drive 42 to move out of the corresponding position. The robotic arm removes the battery that has been tested and replaces it with the next battery.

[0086] Understandably, the next battery is tested by the second detection component 30, and the detection process of the second detection component 30 is similar to that of the first detection component 20, so it will not be described in detail here.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A leak detection device, characterized in that, include: A sealed box having a sealed cavity for accommodating workpieces; The first detection component, connected to the sealed box, is used to detect the volatile gases emitted from the workpiece; and The second detection component, connected to the sealed box, is used to detect the volatile gases emitted from the workpiece; Both the first detection component and the second detection component include a connected state, a detection state, and an exhaust state; When the first detection component or the second detection component is in the connected state, the first detection component or the second detection component connects the sealing cavity and the air extraction device; When the first detection component or the second detection component is in the detection state, the first detection component or the second detection component is in communication with the sealed cavity and separated from the air extraction device; When the first detection component or the second detection component is in the exhaust state, the first detection component or the second detection component is separated from the sealing cavity.

2. The leak detection device according to claim 1, characterized in that, The sealed box includes a base plate and a box body. The base plate is used to support the workpiece, and the box body is detachably connected to the base plate to form the sealed cavity. The first detection component and the second detection component are both connected to the box body.

3. The leak detection device according to claim 2, characterized in that, The leak detection device also includes a frame and a lifting drive component. The housing and the lifting drive component are both mounted on the frame, and the lifting drive component is connected to the base plate to drive the base plate to reciprocate along a first direction. The base plate has a sealing position during the movement. When the base plate is in the sealed position, the base plate is connected to the housing to enclose and form the sealed cavity.

4. The leak detection device according to claim 3, characterized in that, The leak detection device further includes a translation drive component, which is disposed on the frame and is connected to the lifting drive component for transmission, so as to drive the lifting drive component to reciprocate along a second direction perpendicular to the first direction. The lifting drive component has a corresponding position during the movement. When the lifting drive is in the corresponding position, the base plate and the housing correspond in the first direction, so that the base plate can move in the first direction to the sealing position.

5. The leak detection device according to claim 2, characterized in that, The enclosure includes a transparent top panel and side panels. One end of the side panel is fixedly connected to the transparent top panel, and the bottom panel is detachably connected to the other end of the side panel away from the transparent top panel.

6. The leak detection device according to claim 1, characterized in that, The leak detection device further includes a connecting component, which is connected to the sealing box and communicates with the sealing cavity. The connecting component includes a conducting state and a cut-off state. When the connecting component is in the conducting state, the sealed cavity is connected to the outside through the connecting component; When the connecting component is in the closed state, the connecting component separates the sealed cavity from the outside.

7. The leak detection device according to claim 6, characterized in that, The connection assembly includes a first connecting pipe and a first control valve. The first connecting pipe is connected to the sealing box and communicates with the sealing cavity. The first control valve is disposed on the first connecting pipe and is used to control the on / off state of the first connecting pipe.

8. The leak detection device according to any one of claims 1-7, characterized in that, The first detection component includes a second connecting pipe, a second control valve, a third control valve, and a first detector. One end of the second connecting pipe is connected to the sealed box and communicates with the sealed cavity, while the other end is used to communicate with a vacuum device. The second control valve and the third control valve are both disposed on the second connecting pipe, with the second control valve located on the side of the third control valve closer to the sealed box. Both the second control valve and the third control valve are used to control the on / off state of the second connecting pipe. The first detector is disposed on the second connecting pipe and located between the second control valve and the third control valve, and is used to detect the volatile gases emitted by the workpiece.

9. The leak detection device according to claim 8, characterized in that, The second detection component includes a third connecting pipe, a fourth control valve, a fifth control valve, and a second detector. One end of the third connecting pipe is connected to the sealed box and communicates with the sealed cavity, while the other end is used to communicate with the air extraction device. The fourth control valve and the fifth control valve are both located on the third connecting pipe, with the fourth control valve located on the side of the fifth control valve closer to the sealed box. Both the fourth and fifth control valves are used to control the on / off state of the third connecting pipe. The second detector is located on the third connecting pipe and between the fourth and fifth control valves, and is used to detect the volatile gases emitted by the workpiece.

10. The leak detection device according to claim 9, characterized in that, The leak detection device further includes a connecting pipe and a filter element. The connecting pipe is connected to the other end of the second connecting pipe away from the sealed box, the other end of the third connecting pipe away from the sealed box, and an air extraction device. The filter element is disposed in the connecting pipe and is used to filter the gas flowing through the connecting pipe.

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