Helium detection device

Abstract

The utility model belongs to battery production detection technical field discloses a helium detection device. The helium detection device includes sealing assembly and pressure assembly, and sealing assembly includes cavity and upper cover, and the upper cover covers sets up on the cavity to form sealed space, and the sealed space is used for containing square case battery, and pressure assembly sets up on the lateral wall of cavity, and pressure assembly can be close to and press tightly on two first side surfaces and / or two second side surfaces of square case battery, wherein, square case battery includes two opposite first side surfaces and two opposite second side surfaces, and the area of first side surface is greater than the area of second side surface. Pressure assembly can restrain and pressurize square case battery in helium detection process, on one hand, solve the problem that helium detection cannot bear vacuum detection and there is a certain degree of square case battery appearance expansion, on the other hand, can effectively identify the defects such as welding peripheral burst point, pit, sand eye of sealing nail, avoid the major performance accident due to the leakage.

Description

Technical Field

[0001] This utility model relates to the field of battery production testing technology, and in particular to a helium detection device. Background Technology

[0002] Lithium-ion batteries require helium testing during production, including a first helium test after the perimeter welding of the prismatic battery and a second helium test after the sealing pin welding. Currently, commonly used secondary helium testing devices after sealing pin welding consist of a lower helium testing chamber, an upper helium testing chamber, a vacuum system, and a helium detector. However, existing secondary helium testing devices have the following problems:

[0003] The sealing nails of the square battery are welded using laser welding, which results in certain defects after welding. These defects include craters, pits, and pinholes in the welded area, which significantly reduces the mechanical strength and pressure resistance of the battery in this area. Furthermore, the battery may bulge due to the internal and external pressure difference during helium testing, making it extremely easy for the battery to crack and leak at the sealing nail weld. If installed on a customer vehicle, this could lead to the failure of the entire vehicle's battery performance.

[0004] Therefore, it is necessary to design a helium detection device to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this invention is to provide a helium detection device that solves the problem of cracking and leakage at the sealing nail weld joint of a square battery during helium detection due to bulging caused by gas pressure changes, thereby improving the safety of the helium detection process and its practical application.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Helium detection device for detecting helium-filled square batteries, the helium detection device comprising:

[0008] A sealing assembly includes a cavity and a top cover, the top cover being disposed on the cavity to form a sealed space for accommodating the prismatic battery.

[0009] A clamping assembly is disposed on the side wall of the cavity, and the clamping assembly can approach and clamp onto the two first sides and / or the two second sides of the square battery.

[0010] The prismatic battery includes two opposing first sides and two opposing second sides, wherein the area of ​​the first side is larger than the area of ​​the second side.

[0011] Preferably, the clamping assembly includes:

[0012] The first clamping element group includes two opposing first clamping elements, wherein at least one first clamping element is movable relative to the other first clamping element, such that the two first clamping elements can move closer to or further away from each other.

[0013] And / or, the clamping assembly includes:

[0014] The second clamping assembly includes two opposing second clamping members, wherein at least one second clamping member is movable relative to the other second clamping member, such that the two second clamping members can move closer to or further away from each other.

[0015] Preferably, the first clamping assembly further includes a first driving member;

[0016] The first clamping member includes a first mounting part and a first pressure plate. The first mounting part is disposed on the side wall of the cavity and is sealed to the side wall of the cavity. The first pressure plate is connected to the first mounting part.

[0017] In this configuration, at least one of the two first mounting portions is connected to the output end of the first driving member, and the first driving member is capable of driving the first mounting portion connected to its output end to move relative to the side wall of the cavity. The first pressure plate connected to the first mounting portion is capable of moving relative to the other first pressure plate under the drive of the first mounting portion.

[0018] Preferably, the first mounting part is disposed on the side wall of the cavity, one end of the first mounting part is located inside the cavity and connected to the first pressure plate, and the other end is located outside the cavity and can be connected to the output end of the first driving member.

[0019] Preferably, the first pressure plate includes a substrate and a boss disposed on one side surface of the substrate; the substrate can be attached to and pressed against the first side surface, and the boss is connected to the first mounting part.

[0020] Preferably, the substrate has the same shape and area as the first side surface; the boss has the same shape as the substrate, and the area of ​​the boss is smaller than the area of ​​the substrate.

[0021] Preferably, the height of the boss protruding from the substrate is e, where 0.3mm ≤ e ≤ 0.7mm.

[0022] Preferably, the second clamping component assembly further includes a second driving component; the second clamping component includes a second mounting portion and a second pressure plate, the second mounting portion is disposed on the side wall of the cavity and is sealed to the side wall of the cavity, and the second pressure plate is connected to the second mounting portion;

[0023] In this configuration, at least one of the two second mounting portions is connected to the output end of the second driving member, and the second driving member is capable of driving the second mounting portion connected to its output end to move relative to the side wall of the cavity. The second pressure plate connected to the second mounting portion is capable of moving relative to the other second pressure plate under the drive of the second mounting portion.

[0024] Preferably, the second mounting part is disposed on the side wall of the cavity, one end of the second mounting part is located inside the cavity and connected to the second pressure plate, and the other end is located outside the cavity and can be connected to the output end of the second driving member.

[0025] Preferably, the helium detection device further includes a vacuum pressure gauge, a vacuum source, and a helium detector;

[0026] The top cover is provided with a channel, one end of which is connected to the cavity, and the other end of which is connected to the vacuum source and the helium detector located outside the sealing assembly, respectively. The vacuum pressure gauge is provided on the communication path between the channel and the helium detector.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows: In the helium detection device provided in this embodiment, the surface of the square battery can be constrained and pressurized by pressing the clamping component on the two first sides and / or the two second sides of the square battery. This not only solves the problem that the square battery cannot withstand high vacuum detection and has a certain degree of appearance expansion during the helium detection process, but also effectively identifies and judges defects such as sealing nail welding explosions, pits, and sand holes, avoiding the situation of causing major performance accidents when the battery flows to the end customer. Attached Figure Description

[0028] Figure 1 This is a top view of the helium detection device provided in this embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the helium detection device provided in this embodiment of the utility model;

[0030] Figure 3 This is a front view of the first pressure plate provided in this embodiment of the utility model;

[0031] Figure 4 This is a side view of the first pressure plate provided in this embodiment of the utility model.

[0032] In the picture:

[0033] 100. Square-shaped battery; 110. First side surface; 120. Second side surface;

[0034] 1. Sealing assembly; 11. Cavity; 12. Top cover; 121. Channel;

[0035] 2. First clamping component; 21. First mounting part; 22. First pressure plate; 221. Base plate; 222. Boss; 23. First pressure detector;

[0036] 3. Second clamping component; 31. Second mounting part; 32. Second pressure plate; 33. Second pressure detector;

[0037] 4. Vacuum pressure gauge;

[0038] 5. Vacuum source;

[0039] 6. Helium detector. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] The technical solution provided by this utility model will be described below with reference to the accompanying drawings and specific embodiments.

[0045] Combination Figures 1 to 4 As shown, this embodiment provides a helium detection device suitable for helium detection of a square battery 100, including a sealing assembly 1 and a clamping assembly.

[0046] Combination Figure 1 , Figure 2 As shown, the sealing assembly 1 includes a cavity 11 and a top cover 12. The top cover 12 is placed on the cavity 11 to form a sealed space for accommodating the square battery 100 to be tested. The pressing assembly is disposed on the side wall of the cavity 11 and can approach and press against the two first sides 110 and / or the two second sides 120 of the square battery 100.

[0047] In the above configuration, the clamping component can apply uniform pressure to the surface of the square battery 100, and during the helium testing process, it can restrain and pressurize the exterior of the square battery 100. Using a helium testing device with this clamping component, the internal pressure of the square battery 100 during a second helium test can reach a maximum of 50-2000 kgf, enabling the square battery 100 to withstand high vacuum testing and effectively improving the problem of bulging appearance. Furthermore, during high-pressure helium testing, the clamping component can create compressive force inside the square battery 100, matching the compressive pressure of the customer's battery module. This allows for effective identification and judgment of defects such as weld defects, pits, and pinholes around the sealing nails, thereby preventing leakage of the square battery 100 during use and avoiding major performance accidents.

[0048] In this embodiment, the square battery 100 is placed upright in the sealed space. The outer periphery of the square battery 100 is composed of two opposing first side surfaces 110 and two opposing second side surfaces 120. The sealing pin is disposed on the top of the square battery 100.

[0049] In some embodiments, the helium detection device provided by this utility model further includes a vacuum pressure gauge 4, a vacuum source 5, and a helium detector 6. The upper cover 12 is provided with a channel 121. One end of the channel 121 is connected to the cavity 11, and the other end of the channel 121 is connected to the vacuum source 5 and the helium detector 6 located outside the sealing assembly 1, respectively. The vacuum pressure gauge 4 is provided on the communication path between the channel 121 and the helium detector 6.

[0050] In the above configuration, since the square battery 100 is erected in a sealed space and the sealing nail is located on top of the square battery 100, the distance between the sealing nail and the channel 121 can be shortened. In this way, if the square battery 100 has a defect at the welding point of the sealing nail and causes leakage, more helium gas seeping out from the welding point of the sealing nail can be detected by the helium detector 6, thereby effectively improving the detection sensitivity and detection efficiency of the helium detector 6.

[0051] In some embodiments, the clamping assembly includes a first clamping member group, which includes two opposing first clamping members 2, wherein at least one first clamping member 2 is movable relative to the other first clamping member 2, allowing the two first clamping members 2 to move closer to or further away from each other. In this embodiment, the two first clamping members 2 are respectively disposed opposite to the two first sides 110 of the prismatic battery 100. This design allows the clamping assembly to adapt to prismatic batteries 100 of different lengths (parallel to the X-axis in the figure), thereby improving the versatility of the helium detection device.

[0052] In some specific embodiments, reference is made to Figure 1 As shown, the first clamping member 2 includes a first mounting portion 21 and a first pressure plate 22. The first mounting portion 21 is disposed on the side wall of the cavity 11 and is sealed to the side wall of the cavity 11. The first pressure plate 22 is connected to the first mounting portion 21 and is used to contact and press against the first side 110 of the square battery 100. In addition, the first clamping member assembly also includes a first driving member. At least one of the two first mounting portions 21 is connected to the output end of the first driving member. The first driving member drives the first mounting portion 21 connected to its output end to move relative to the side wall of the cavity 11. The first pressure plate 22 connected to the first mounting portion 21 can move relative to the other first pressure plate 22 under the drive of the first mounting portion 21.

[0053] For example, in this embodiment, one of the first clamping members 2 is fixedly disposed relative to the side wall of the cavity 11, and the other first clamping member 2 is connected to the first driving member. In use, one of the first side surfaces 110 of the square battery 100 can be first pressed against the surface of the first pressure plate 22 of one of the first clamping members 2 to pre-position the square battery 100. Then, the first driving member is activated, and the output end of the first driving member pushes the first mounting part 21 of the other first clamping member 2 connected thereto to move relative to the side wall of the cavity 11. The first pressure plate 22 connected to the first mounting part 21 moves relative to the first pressure plate 22 of one of the first clamping members 2 until it is pressed against the other first side surface 110 of the square battery 100.

[0054] Furthermore, the first clamping member 2 also includes a first pressure detector 23 that can be mounted on the first driving member. The first pressure detector 23 is communicatively connected to the first driving member. The compressive force between the first pressure plate 22 and the prismatic battery 100 can be transmitted to the first pressure detector 23 in sequence through the first pressure plate 22, the first mounting part 21 and the first driving member. This allows the first pressure detector 23 to detect the compressive force between the first pressure plate 22 and the prismatic battery 100 and to determine whether to send a stop signal to the first driving member based on the detection result, thereby ensuring that the compressive force on the prismatic battery 100 can be controlled within a reasonable range.

[0055] Furthermore, it should be noted that in other embodiments, the two first clamping members 2 can be connected to the output end of the same first driving member; alternatively, two first driving members can be connected one-to-one with the two first clamping members 2, so that both first clamping members 2 can move relative to the side wall of the cavity 11 to clamp the square battery 100. Therefore, all three embodiments described above are within the protection scope of this utility model.

[0056] The first driving component can be a cylinder, hydraulic cylinder, or motor. Cylinders have the advantages of fast response and stable operation. Motors can convert rotational motion into linear motion to drive the first pressing component 2, which can achieve more precise displacement control of the first pressure plate 22.

[0057] In some specific embodiments, the first mounting part 21 passes through the side wall of the cavity 11. One end of the first mounting part 21 is located inside the cavity 11 and connected to the first pressure plate 22, while the other end is located outside the cavity 11 and can be connected to the output end of the first driving member. This through-type mounting method allows the first driving member to control the position of the first pressure plate 22 outside the cavity 11, avoiding the need to leave an extra area in the sealed space for the first driving member. This helps to reduce the volume occupied by the sealing assembly 1, thereby facilitating the use of the helium detection device.

[0058] A guide sleeve can be provided at the penetration point between the first mounting part 21 and the side wall of the cavity 11. The guide sleeve can be made of wear-resistant material, which can reduce friction when the first mounting part 21 moves, thereby helping to improve the stability of the first mounting part 21 during movement.

[0059] In some specific embodiments, the area of ​​the first side 110 of the prismatic battery 100 is larger than the area of ​​the second side 120; Reference Figure 3 , Figure 4 As shown, the first pressure plate 22 includes a substrate 221 and a boss 222 disposed on one side surface of the substrate 221. The substrate 221 can be attached to and pressed against the first side surface 110, and the boss 222 is connected to the first mounting part 21. The boss 222 allows the driving force of the first driving member to be transmitted to the substrate 221 through the first mounting part 21 and the boss 222, and then act on the first side surface 110. The boss 222 can concentrate the driving force to the substrate 221, increasing the force dispersion. Since the first side surface 110 is a relatively large surface area of ​​the prismatic battery 100, the substrate 221 needs to be attached to it, resulting in a relatively large area. The boss 222 ensures that the driving force can be transmitted more efficiently to all parts of the substrate 221, making the pressing force of the substrate 221 on the prismatic battery 100 more uniform, and avoiding excessive localized force on the prismatic battery 100 on the first side surface 110 due to uneven force transmission.

[0060] In this embodiment, the substrate 221 has the same shape and area as the first side surface 110; the boss 222 has the same shape as the substrate 221, and the area of ​​the boss 222 is smaller than that of the substrate 221. The boss 222 on the first pressure plate 22, with an area smaller than that of the first side surface 110, effectively applies pressure to the first side surface 110. Typically, the size of the boss 222 is 5-15mm smaller than the perimeter of the first side surface 110, allowing the compressive force on the first side surface 110 to be increased to a range of 50-2000 kgf. This can be referenced to the compressive pressure of customer battery modules, effectively simulating the battery state in customer application scenarios. This allows for the early sealing and repair of defective prismatic batteries 100, ensuring that defective products do not leak out for use.

[0061] In this embodiment, the height e of the protrusion 222 protruding from the substrate 221 is 0.3mm ≤ e ≤ 0.7mm. For example, the height e of the protrusion 222 protruding from the substrate 221 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, or 0.7mm. It should be noted that if the height e of the protrusion 222 protruding from the substrate 221 is less than 0.3mm, the connection rigidity between the protrusion 222 and the first mounting portion 21 is insufficient, making it prone to deformation under stress. This results in a lag in the force transmission effect of the protrusion 222, causing uneven pressing force of the substrate 221 on the first side surface 110. If the height e of the protrusion 222 protruding from the substrate 221 exceeds 0.7mm, the bending moment due to the weight of the protrusion 222 itself increases, potentially causing stress concentration at the connection between the protrusion 222 and the first mounting portion 21. Long-term use may lead to fatigue damage, affecting the transmission effect of the driving force and thus reducing the pressure effect on the first side surface 110.

[0062] In some embodiments, the clamping assembly further includes a second clamping member group, which includes two opposing second clamping members 3, wherein at least one second clamping member 3 is movable relative to the other second clamping member 3, allowing the two second clamping members 3 to move closer to or further away from each other. In this embodiment, the two second clamping members 3 are respectively disposed opposite to the two second sides 120 of the prismatic battery 100, allowing the clamping assembly to adapt to prismatic batteries 100 of different widths (parallel to the Y-axis in the figure) through the second clamping members 3. The first clamping member group and the second clamping member group cooperate with each other to clamp the prismatic battery 100 from different directions, thereby further improving the versatility of the helium detection device and the stability of fixing the prismatic battery 100.

[0063] In some embodiments, the second clamping component group further includes a second driving component; the second clamping component 3 includes a second mounting portion 31 and a second pressure plate 32. The second mounting portion 31 is disposed on the side wall of the cavity 11 and is sealed to the side wall of the cavity 11; the second pressure plate 32 is connected to the second mounting portion 31. It should be understood that the sealing connection between the second mounting portion 31 and the side wall of the cavity 11 is similar to that of the first mounting portion 21, and sealing components such as sealing rings can also be provided to ensure the airtightness of the sealed space during helium detection. At least one of the two second mounting portions 31 is connected to the output end of the second driving component, and the second driving component can drive the second mounting portion 31 connected to its output end to move relative to the side wall of the cavity 11. The second pressure plate 32 connected to the second mounting portion 31 can move relative to the other second pressure plate 32 under the drive of the second mounting portion 31.

[0064] In this embodiment, one of the second clamping members 3 is fixedly disposed relative to the side wall of the cavity 11, and the other second clamping member 3 is connected to the output end of the second driving member. In use, one of the second side surfaces 120 of the prismatic battery 100 can be first pressed tightly against the surface of the second pressure plate 32 of one of the second clamping members 3 to limit the prismatic battery 100 in the length direction; then the second driving member is activated, and the output end of the second driving member pushes the second mounting part 31 of the other second clamping member 3 connected thereto to move relative to the side wall of the cavity 11, and the second pressure plate 32 connected to the second mounting part 31 moves relative to the second pressure plate 32 of one of the second clamping members 3 until it is pressed against the other second side surface of the prismatic battery 100.

[0065] Furthermore, the second clamping member 3 also includes a second pressure detector 33 that can be mounted on the second driving member. The second pressure detector 33 is communicatively connected to the second driving member. The compressive force between the second pressure plate 32 and the square battery 100 can be transmitted to the second pressure detector 33 in sequence through the second pressure plate 32, the second mounting part 31, and the second driving member. Thus, the second pressure detector 33 can detect the compressive force between the second pressure plate 32 and the square battery, and determine whether to send a stop signal to the second driving member based on the detection result, so as to ensure that the compressive force applied to the square battery 100 from the second side 120 can be controlled within a reasonable range.

[0066] Furthermore, it should be noted that, similar to the first driving member, in other embodiments, the two second clamping members can be connected to the output end of the same second driving member; alternatively, the two second driving members can be respectively connected to the two second clamping members 3, so that both second clamping members 3 can move relative to the side wall of the cavity 11 and clamp the square battery 100. The second driving member can also be any of the driving devices such as a cylinder, hydraulic cylinder, or motor, and this utility model is not limited thereto.

[0067] In some embodiments, the second mounting portion 31 passes through the side wall of the cavity 11, with one end of the second mounting portion 31 located inside the cavity 11 and connected to the second pressure plate 32, and the other end located outside the cavity 11 and capable of connecting to the output end of the second drive member. Similarly, a guide sleeve and sealing assembly can be provided at the penetration point between the second mounting portion 31 and the side wall of the cavity 11 to ensure its stability and sealing during movement. Furthermore, the structure of the second pressure plate 32 can be designed according to the shape and size of the second side surface 120 of the prismatic battery 100, typically using a flat plate that matches the shape of the second side surface 120 to ensure sufficient contact and effective clamping with the second side surface 120.

[0068] With the above settings, the second driving component can effectively control the position of the second pressure plate 32 outside the cavity 11, thereby avoiding the need to reserve space in the cavity 11 for installing the second driving component in the X-axis direction, which can further reduce the required volume of the sealing assembly 1 and further facilitate the use and transportation of the helium detection device.

[0069] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A helium detection device for detecting helium-filled square batteries (100), characterized in that, The helium detection device includes: A sealing assembly (1) includes a cavity (11) and a top cover (12), the top cover (12) being disposed on the cavity (11) to form a sealed space for accommodating the square battery (100); A pressing assembly is disposed on the side wall of the cavity (11), and the pressing assembly can approach and press against the two first sides (110) and / or the two second sides (120) of the square battery (100); The square-shell battery (100) includes two oppositely arranged first side surfaces (110) and two oppositely arranged second side surfaces (120), and the area of ​​the first side surface (110) is larger than the area of ​​the second side surface (120).

2. The helium detection device according to claim 1, characterized in that, The clamping assembly includes: The first clamping member group includes two opposing first clamping members (2), wherein at least one first clamping member (2) is movable relative to the other first clamping member (2), such that the two first clamping members (2) can move closer to or further away from each other; And / or, the clamping assembly includes: The second clamping assembly includes two opposing second clamping members (3), wherein at least one second clamping member (3) is movable relative to the other second clamping member (3), such that the two second clamping members (3) can move closer to or further away from each other.

3. The helium detection device according to claim 2, characterized in that, The first clamping assembly also includes a first driving component; The first clamping member (2) includes a first mounting part (21) and a first pressure plate (22). The first mounting part (21) is disposed on the side wall of the cavity (11) and is sealed to the side wall of the cavity (11). The first pressure plate (22) is connected to the first mounting part (21). At least one of the two first mounting portions (21) is connected to the output end of the first driving member. The first driving member can drive the first mounting portion (21) connected to its output end to move relative to the side wall of the cavity (11). The first pressure plate (22) connected to the first mounting portion (21) can move relative to the other first pressure plate (22) under the drive of the first mounting portion (21).

4. The helium detection device according to claim 3, characterized in that, The first mounting part (21) passes through the side wall of the cavity (11). One end of the first mounting part (21) is located inside the cavity (11) and connected to the first pressure plate (22), and the other end is located outside the cavity (11) and can be connected to the output end of the first driving member.

5. The helium detection device according to claim 3, characterized in that, The first pressure plate (22) includes a base plate (221) and a boss (222) disposed on one side surface of the base plate (221); the base plate (221) can be attached to and pressed against the first side surface (110), and the boss (222) is connected to the first mounting part (21).

6. The helium detection device according to claim 5, characterized in that, The substrate (221) has the same shape and area as the first side surface (110); the boss (222) has the same shape as the substrate (221), and the area of ​​the boss (222) is smaller than the area of ​​the substrate (221).

7. The helium detection device according to claim 5, characterized in that, The height of the boss (222) protruding from the substrate (221) is e, where 0.3mm≤e≤0.7mm.

8. The helium detection device according to claim 2, characterized in that, The second clamping component group also includes a second driving component; the second clamping component (3) includes a second mounting part (31) and a second pressure plate (32), the second mounting part (31) is disposed on the side wall of the cavity (11) and is sealed to the side wall of the cavity (11); the second pressure plate (32) is connected to the second mounting part (31); At least one of the two second mounting portions (31) is connected to the output end of the second drive member. The second drive member can drive the second mounting portion (31) connected to its output end to move relative to the side wall of the cavity (11). The second pressure plate (32) connected to the second mounting portion (31) can move relative to the other second pressure plate (32) under the drive of the second mounting portion (31).

9. The helium detection device according to claim 8, characterized in that, The second mounting part (31) passes through the side wall of the cavity (11). One end of the second mounting part (31) is located inside the cavity (11) and connected to the second pressure plate (32), and the other end is located outside the cavity (11) and can be connected to the output end of the second drive member.

10. The helium detection device according to any one of claims 1-9, characterized in that, The helium detection device also includes a vacuum pressure gauge (4), a vacuum source (5), and a helium detector (6); The upper cover (12) is provided with a channel (121), one end of the channel (121) is connected to the cavity (11), and the other end of the channel (121) is connected to the vacuum source (5) and the helium detector (6) located outside the sealing assembly (1), respectively. The vacuum pressure gauge (4) is provided on the communication path between the channel (121) and the helium detector (6).

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