Air tightness detection device and helium detection jig

Abstract

The utility model provides an air tightness detection device and a helium detection jig, and relates to the technical field of battery cell production and manufacturing. The air tightness detection device comprises a bottom plate and a mounting plate, the bottom plate is used for mounting a helium detection device, and the bottom plate is provided with a first air channel; the mounting plate is arranged on the bottom plate and detachably connected to the bottom plate, the mounting plate is used for bearing a to-be-detected top cover, and the mounting plate is provided with a second air channel corresponding to the first air channel; wherein the first gas passage is communicated with the helium detection device, and the second gas passage is communicated with the first gas passage and is used for detecting the gas tightness of the top cover to be detected. The mounting plate and the bottom plate are of a split structure, the bottom plate can be fixed to the helium detection device, the steps of repeated dismounting and bolt screwing are omitted, the mounting plate can be replaced according to the size of a top plate to be detected, the mounting plate can be called as a profiling plate, and the mounting plate can be directly and independently replaced to meet the requirements of different types and sizes of the top plate to be detected. And the universality is high.

Description

Technical Field

[0001] The utility model generally relates to the technical field of battery cell production and manufacturing, and specifically relates to an air tightness detection device and a helium detection fixture. Background Art

[0002] After the existing top cover is manufactured, it needs to be tested for airtightness to ensure the quality of the finished product. Figure 1 As shown, the base plate 10 of the existing inspection tool is fixed to the inspection tool by bolts, and is connected to the air inlet of the inspection tool through the cavity pipeline channel. As energy storage cells are developing towards large capacity, there are many types of square and cylindrical top covers, and the sizes of various types are different. As a result, when replacing and inspecting different types of battery products, each type of battery product needs to be equipped with a base plate 10 that is adapted to its size, which has poor versatility and high production costs. At the same time, when replacing the base plate 10, it is necessary to repeatedly install and remove the bolts, which leads to cumbersome steps in the detection process, wastes time and energy, and affects the detection efficiency. Utility Model Content

[0003] The utility model provides an air tightness detection device and a helium detection fixture, which are easy to install and disassemble and have strong versatility.

[0004] According to a first aspect of the utility model, there is provided an airtightness detection device, comprising:

[0005] A bottom plate, used for installing a helium detection device, wherein the bottom plate is provided with a first air channel;

[0006] A mounting plate, arranged on the bottom plate and detachably connected to the bottom plate, the mounting plate being used to carry the top cover to be detected, and the mounting plate being provided with a second air passage corresponding to the first air passage;

[0007] The first air channel is connected to the helium detection device, and the second air channel is connected to the first air channel, and is used to detect the air tightness of the top cover to be detected.

[0008] In some embodiments, it also includes:

[0009] A first sealing structure is arranged between the base plate and the mounting plate. The first sealing structure is arranged on a side of the first air duct facing the mounting plate, and the first sealing structure is arranged on a side of the second air duct facing the base plate, so that a first sealed space is formed between the base plate and the mounting plate, and the first sealed space is respectively connected to the first air duct and the second air duct.

[0010] In some embodiments, it also includes:

[0011] A second sealing structure is disposed between the mounting plate and the top cover to be detected. The second sealing structure is annularly arranged on one side of the second air passage away from the bottom plate, so as to form a second sealing space between the mounting plate and the detection top cover, and the second sealing space is communicated with the second air passage.

[0012] In some embodiments, a mounting groove is provided on one side of the bottom plate facing the mounting plate, the mounting plate is disposed in the mounting groove, and the first air passage is provided at the bottom of the mounting groove and communicated with the mounting groove.

[0013] In some embodiments, it further includes:

[0014] A limiting structure is disposed in the mounting groove, and the limiting structure is used for carrying and limiting the mounting plate;

[0015] A third sealing structure is disposed between the limiting structure and the mounting plate.

[0016] In some embodiments, the second air passage includes a first sub-air passage and two second sub-air passages. The two second sub-air passages are disposed on both sides of the first sub-air passage along the length direction of the bottom plate. The position of the explosion-proof valve of the top cover to be detected corresponds to the first sub-air passage, and the positions of the two pole holes of the top cover to be detected correspond to the two second sub-air passages.

[0017] In some embodiments, both the first sub-air passage and the second sub-air passage include a receiving groove and a middle through hole. The pole or explosion-proof valve of the top cover to be detected is disposed in the receiving groove, and the middle through hole is communicated with the receiving groove and the first air passage;

[0018] Wherein, along the length direction of the bottom plate, the width of the middle through hole is smaller than the width of the receiving groove.

[0019] In some embodiments, the second air passage further includes a communication hole, and the communication hole is located between the middle through hole and the first air passage and is respectively communicated with them;

[0020] Wherein, the projections of the middle through holes of the first sub-air passage and the second sub-air passage on the reference plane are located inside the projection of the communication hole on the reference plane;

[0021] Wherein, the reference plane is the side surface of the mounting plate facing the bottom plate, and the reference plane is perpendicular to the thickness direction of the bottom plate.

[0022] In some embodiments, the second air passage includes a second through hole, and the second through hole penetrates through two side surfaces of the mounting plate along the thickness direction of the bottom plate;

[0023] Among them, the explosion-proof valve and the two pole columns of the top cover to be detected overlap with the projection of the second through hole on the reference plane, where the reference plane is the side of the mounting plate facing the bottom plate.

[0024] In some embodiments, the first air passage includes a first through hole, and the shape of the first through hole is at least one of circular, kidney-shaped, oval, and polygonal;

[0025] And / or, the first air passage includes a first through hole, and the projection of the first through hole on the reference plane overlaps with the projection of the second air passage on the reference plane, where the reference plane is the side of the mounting plate facing the bottom plate, and the reference plane is perpendicular to the thickness direction of the bottom plate;

[0026] And / or, the first air passage includes a first through hole, the number of the first through holes is one, and one first through hole is arranged in the middle of the bottom plate along the length direction of the bottom plate, or the number of the first through holes is multiple, and multiple first through holes are arranged at intervals along the length direction of the bottom plate.

[0027] According to a second aspect of the present invention, an embodiment of the present invention further provides a helium leak detection fixture, including a helium leak detection device, a pressing device, and the above-mentioned airtightness detection device. The airtightness detection device is arranged on the helium leak detection device, the pressing device is arranged on the side of the airtightness detection device away from the helium leak detection device, and the top cover to be detected is arranged between the airtightness detection device and the pressing device; wherein, the pressing device is configured to be able to press the top cover to be detected and push the top cover to be detected in the direction towards the airtightness detection device, so that both sides of the mounting plate of the airtightness detection device are respectively pressed against the bottom plate and the top cover to be detected, and the helium leak detection device is used to detect the airtightness of the top cover to be detected.

[0028] An embodiment of the present invention has the following advantages or beneficial effects:

[0029] For the airtightness detection device and the helium leak detection fixture provided by the present invention, the mounting plate and the bottom plate are of a split structure. The bottom plate can be fixed on the helium leak detection device, saving the steps of repeated disassembly and screwing of bolts. The mounting plate can be replaced according to the size of the top cover to be detected. The mounting plate can be called a profiling plate and can be directly and separately replaced to match the needs of different types and sizes of the top cover to be detected, with strong versatility. When the airtightness of the top cover to be detected needs to be detected, if the top cover to be detected has poor sealing, helium gas is output to the helium leak detection device through the second air passage and the first air passage to detect the airtightness of the top cover to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To better understand the present utility model, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of the present utility model. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the drawings, the same reference numerals denote the same or similar components in each drawing. By describing in detail its exemplary embodiments with reference to the drawings, the above and other features and advantages of the present utility model will become more apparent.

[0031] Wherein:

[0032] Figure 1 The figure shows a schematic structural diagram of a bottom plate provided by the prior art;

[0033] Figure 2 The figure shows a schematic structural diagram of a top cover to be helium leak detected required by the present utility model;

[0034] Figure 3 The figure shows an exploded view of a hermeticity detection device according to Embodiment 1 of the present utility model Figure 1 ;

[0035] Figure 4 The figure shows a schematic cooperation diagram of another form of the top cover to be detected and the mounting plate in the hermeticity detection device according to Embodiment 1 of the present utility model;

[0036] Figure 5 The figure shows an exploded view of a hermeticity detection device according to Embodiment 1 of the present utility model Figure 2 ;

[0037] Figure 6 The figure shows a schematic structural diagram of the bottom plate in the hermeticity detection device according to Embodiment 1 of the present utility model;

[0038] Figure 7 The figure shows a sectional view of the mounting plate in the hermeticity detection device according to Embodiment 1 of the present utility model;

[0039] Figure 8 The figure shows a schematic structural diagram of a helium leak detection jig according to Embodiment 2 of the present utility model;

[0040] Figure 9 The figure shows a schematic structural diagram of the pressing block in the helium leak detection jig according to Embodiment 2 of the present utility model.

[0041] Wherein, the reference numeral descriptions are as follows:

[0042] 10. Bottom plate;

[0043] 100. Top cover to be detected; 101. Cover plate; 102. Terminal post; 103. Explosion-proof valve; 200. Compression device; 201. Compression driving source; 202. Compression block; 2021. Avoidance groove; 2022. Air outlet; 2023. Compression surface; 2024. Connector;

[0044] 1. Bottom plate; 2. Mounting plate; 3. First sealing structure; 4. Second sealing structure; 5. Third sealing structure;

[0045] 11. First air passage; 12. Mounting groove; 13. First connection hole;

[0046] 21. Second air passage; 211. First sub-air passage; 2111. Accommodation groove; 2112. Intermediate through hole; 212. Second sub-air passage; 213. Communication hole. Detailed implementation manner

[0047] Next, the technical solutions in the exemplary embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the exemplary embodiments of the present utility model. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the protection scope of the present utility model. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the protection scope of the present utility model.

[0048] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plurality" means two or more; the term "and / or" includes any combination and all combinations of one or more of the associated listed items. In particular, referring to "the / this" object or "one" object also intends to represent one of the possible multiple such objects.

[0049] Unless otherwise specified or described, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0050] Further, in the description of the present utility model, it should be understood that the orientation terms such as "upper", "lower", "inner", and "outer" described in the exemplary embodiments of the present utility model are described from the angles shown in the drawings and should not be construed as limiting the exemplary embodiments of the present utility model. It should also be understood that in the context, when an element or feature is referred to as being connected "on", "under", or "inside", "outside" of another element (one or more), it can not only be directly connected "on", "under", or "inside", "outside" of the other element (one or more), but also be indirectly connected "on", "under", or "inside", "outside" of the other element (one or more) through an intermediate element.

[0051] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this utility model will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their detailed description will be omitted.

[0052] Embodiment 1

[0053] As Figure 2 shown is a schematic structural diagram of a power battery top cover to be helium-inspected in this embodiment. This power battery top cover is the top cover 100 to be detected. The top cover 100 to be detected includes a cover plate 101, pole columns, and an explosion-proof valve 103. The pole columns are specifically divided into a positive pole column and a negative pole column. The cover plate 101 is provided with a positive pole column mounting hole, a negative pole column mounting hole, and an explosion-proof valve mounting hole. The positive pole column, the negative pole column, and the explosion-proof valve 103 are respectively hermetically installed in the positive pole column mounting hole, the negative pole column mounting hole, and the explosion-proof valve mounting hole. This embodiment is described by taking the top cover equipped with two pole columns 102 as an example. It can be understood that in other embodiments, the top cover may also be equipped with only one pole column 102.

[0054] The helium-inspection fixture provided in this embodiment is used to perform helium inspection on the sealing performance between the positive pole column, the negative pole column, and the explosion-proof valve 103 and the cover plate 101 after the top cover is assembled, that is, to detect the airtightness of the top cover 100 to be detected at the positive pole column, the negative pole column, and the explosion-proof valve 103.

[0055] This embodiment also provides an airtightness detection device. As Figure 3 shown, this airtightness detection device includes a bottom plate 1, and the bottom plate 1 is arranged on the helium-inspection device. Among them, the helium-inspection device can specifically be a helium mass spectrometer.

[0056] Among them, the bottom plate 1 is a plate-like structure, and the outer shape of the bottom plate 1 is similar to a cuboid structure. Define the length direction of the bottom plate 1 as the X direction, the width direction of the bottom plate 1 as the Y direction, and the thickness direction of the bottom plate 1 as the Z direction. The length direction, width direction, and thickness direction of the bottom plate 1 are perpendicular to each other pairwise. The length direction, width direction, and thickness direction of the bottom plate 1 only represent spatial directions and have no substantial meaning.

[0057] The bottom plate 1 is provided with a first connection hole 13. The helium leak detection device is correspondingly provided with a second connection hole for the first connection hole 13. After the bottom plate 1 is placed on the helium leak detection device, a bolt is inserted through the first connection hole 13 and the second connection hole to realize the detachable connection between the bottom plate 1 and the helium leak detection device, facilitating the installation and disassembly between the bottom plate 1 and the helium leak detection device and facilitating subsequent maintenance.

[0058] The number of the first connection hole 13 and the second connection hole can be selected as multiple. For example, the number of the first connection hole 13 and the second connection hole is four, and the four first connection holes 13 are distributed at the four corner positions of the bottom plate 1, further improving the installation stability between the bottom plate 1 and the helium leak detection device.

[0059] Since the types of the to-be-detected top covers 100 are diverse. For example, Figure 2 - Figure 3 as shown is a large-capacity top cover, and Figure 4 as shown is a small-capacity top cover. There will also be differences in the sizes of the to-be-detected top covers 100. If the to-be-detected top cover 100 is directly placed on the bottom plate 1, when the size of the to-be-detected top cover 100 is relatively large, the bottom plate 1 cannot fully carry the to-be-detected top cover 100, and the bottom plate 1 needs to be replaced synchronously with the to-be-detected top cover 100, resulting in frequent disassembly and screwing of bolts, a complex operation process, and low production efficiency.

[0060] Therefore, as Figure 3 - Figure 4 shown, the airtightness detection device provided in this embodiment further includes a mounting plate 2. The mounting plate 2 is arranged on the bottom plate 1 and is detachably connected to the bottom plate 1. The mounting plate 2 is used to carry the to-be-detected top cover 100. That is, the bottom plate 1, the mounting plate 2, and the to-be-detected top cover 100 are stacked along the thickness direction of the bottom plate 1.

[0061] The mounting plate 2 and the bottom plate 1 are of a split structure. The bottom plate 1 can be fixed on the helium leak detection device, saving the steps of repeated disassembly and screwing of bolts. The mounting plate 2 can be replaced according to the size of the to-be-detected top cover 100. The mounting plate 2 can be called a profiling plate, and the mounting plate 2 can be directly and separately replaced to match the needs of different types and sizes of the to-be-detected top covers 100, with relatively strong versatility.

[0062] Specifically, as Figure 5As shown, the bottom plate 1 is provided with a first air passage 11, and the mounting plate 2 is correspondingly provided with a second air passage 21 corresponding to the first air passage 11. Among them, the first air passage 11 is communicated with the helium detection device, and the second air passage 21 is communicated with the first air passage 11 and is correspondingly arranged with the top cover 100 to be detected, and is used to detect the air tightness of the top cover 100 to be detected.

[0063] When the air tightness of the top cover 100 to be detected is required, if the top cover 100 to be detected has poor sealing, helium is output to the helium detection device through the second air passage 21 and the first air passage 11 to detect the air tightness of the top cover 100 to be detected. For example, the welding positions between the cover plate 101 and the terminal post 102 of the top cover 100 to be detected, and the welding positions between the cover plate 101 and the explosion-proof valve 103.

[0064] In one embodiment, as Figure 3 - Figure 6 shown, a mounting groove 12 is provided on one side of the bottom plate 1 facing the mounting plate 2, and the mounting plate 2 is arranged in the mounting groove 12.

[0065] The size of the mounting groove 12 is slightly larger than the size of the mounting plate 2, that is, the length of the mounting groove 12 along the length direction of the bottom plate 1 is greater than the length of the mounting plate 2, and the width of the mounting groove 12 along the width direction of the bottom plate 1 is slightly larger than the width of the mounting plate 2. The mounting groove 12 of the bottom plate 1 can provide a receiving space for the mounting plate 2, the inner wall shape of the mounting groove 12 can match the outer contour of the mounting plate 2, and the inner wall of the mounting groove 12 plays a role in limiting the mounting plate 2. At the same time, after the mounting plate 2 is placed in the mounting groove 12, it is equivalent to the mounting plate 2 being embedded in the bottom plate 1, saving space in the thickness direction of the bottom plate 1, and having good overall appearance consistency.

[0066] Among them, the first air passage 11 is arranged at the bottom of the mounting groove 12 and communicated with the mounting groove 12, so that the helium output by the helium detection device is conveyed to the mounting groove 12 through the first air passage 11. The bottom of the mounting groove 12 is in contact with the bottom surface of the mounting plate 2, which is beneficial to the output of helium through the second air passage 21 of the mounting plate 2.

[0067] Exemplarily, the first air passage 11 includes a first through hole, and the first through hole realizes the intermediate communication between the helium detection device and the mounting groove 12. The shape of the first through hole is at least one of a circle, a waist shape, an ellipse, and a polygon, and the shape of the polygon includes, but is not limited to, regular or irregular shapes such as a triangle, a square, a rectangle, and a hexagon.

[0068] Exemplarily, along the length direction of the bottom plate 1, the projection of the length of the first through hole on the reference plane partially overlaps with the projection of the second air passage 21 on the reference plane. Among them, the reference plane is the side surface of the mounting plate 2 facing the bottom plate 1, and the reference plane is perpendicular to the thickness direction of the bottom plate 1.

[0069] That is, the inner diameter of the first through hole is relatively small, which realizes the centralized transportation of helium, reduces the risk of helium loss during transportation, and the flow rate of helium in the first through hole is greater than that in the second air passage 21, improving the efficiency of helium transportation to the mounting plate 2.

[0070] It can be understood that the number of the first through holes is one, and one first through hole is arranged in the middle of the bottom plate 1 along the length direction of the bottom plate 1; the number of the first through holes can also be multiple, and multiple first through holes are arranged at intervals along the length direction of the bottom plate 1.

[0071] In one embodiment, as Figure 3 - Figure 6 shown, the airtightness detection device further includes a first sealing structure 3. The first sealing structure 3 is arranged between the bottom plate 1 and the mounting plate 2. The first sealing structure 3 is annularly arranged on the side of the first air passage 11 facing the mounting plate 2, and the first sealing structure 3 is annularly arranged on the side of the second air passage 21 facing the bottom plate 1, so that the first sealing structure 3 can completely cover the areas of the first air passage 11 and the second air passage 21.

[0072] Since the first sealing structure 3 is arranged between the bottom plate 1 and the mounting plate 2, the sealing between the bottom plate 1 and the mounting plate 2 is realized by extruding the first sealing structure 3, forming a first sealed space between the bottom plate 1 and the mounting plate 2. The first sealed space is respectively communicated with the first air passage 11 and the second air passage 21 to ensure the airtightness of the transportation channel during helium transportation, and avoid the situation of helium leakage or inaccurate airtightness detection of the top cover 100 to be detected.

[0073] Among them, the first sealing structure 3 can be selected as a first sealing ring. The first sealing ring is an annular structure, and the shape of the first sealing ring is at least one of a strip shape, an oval shape, and a waist shape. Since the explosion-proof valve 103 and the two pole columns 102 of the top cover 100 to be detected are arranged along the length direction of the bottom plate 1, the first sealing ring extends along the length direction of the bottom plate 1, so that the first sealing ring can cover the areas corresponding to the pole columns 102 and the explosion-proof valve 103 to the greatest extent to ensure the airtightness during helium transportation.

[0074] Specifically, along the thickness direction of the bottom plate 1, at least one of the sides of the bottom plate 1 and the mounting plate 2 facing each other is provided with a first fixing groove for fixing the first sealing ring. For example, a first fixing groove is provided at the bottom of the installation groove 12, and the first sealing ring is fixed in the first fixing groove.

[0075] Of course, in some other embodiments, the first sealing structure 3 can also be formed by coating a sealing glue at the bottom of the installation groove 12. The specific form of the first sealing structure 3 in this embodiment is not limited, as long as the sealing can be realized, it is within the protection scope of this embodiment.

[0076] In one embodiment, as Figure 3 - Figure 5As shown in the figure, the second air duct 21 includes a first sub-air duct 211 and two second sub-air ducts 212. The two second sub-air ducts 212 are arranged on both sides of the first sub-air duct 211 along the length direction of the bottom plate 1. The position of the explosion-proof valve 103 of the top cover 100 to be detected is correspondingly arranged with the first sub-air duct 211. The helium gas leaking from the explosion-proof valve 103 of the top cover 100 to be detected is transported to the first air duct 11 through the first sub-air duct 211 to detect the airtightness of the welded position between the explosion-proof valve 103 and the cover plate 101.

[0077] Exemplarily, the hole positions of the pole columns 102 of the top cover 100 to be detected are correspondingly arranged with the two second sub-air ducts 212. The helium gas leaking from the two pole columns 102 of the top cover 100 to be detected is transported to the first air duct 11 through the two second sub-air ducts 212 to detect the airtightness of the welded position between the pole columns 102 and the cover plate 101.

[0078] Since the first sub-air duct 211 is correspondingly arranged with the explosion-proof valve 103, and the second sub-air duct 212 is correspondingly arranged with the pole column 102, the transport channels are independent, reducing the loss and consumption of helium gas during transportation, and the output helium gas can be concentrated at the positions to be detected corresponding to the explosion-proof valve 103 and the pole column 102, avoiding the situation where the helium gas impact is insufficient due to dispersion.

[0079] Specifically, as Figure 5 and Figure 7 shown in the figure, both the first sub-air duct 211 and the second sub-air duct 212 include a receiving groove 2111. The pole column 102 or the explosion-proof valve 103 of the top cover 100 to be detected is arranged in the receiving groove 2111.

[0080] Among them, the shape of the receiving groove 2111 of the first sub-air duct 211 is waist-shaped, which matches the outer shape of the explosion-proof valve 103, so that at least part of the explosion-proof valve 103 is received in the receiving groove 2111 of the first sub-air duct 211, playing a positioning role; the shape of the receiving groove 2111 of the second sub-air duct 212 is a square structure or a circular structure, which is correspondingly arranged with the square pole column 102 or the cylindrical pole column 102, so that the pole column 102 can just be received in the receiving groove 2111, playing a positioning role.

[0081] Both the first sub-air duct 211 and the second sub-air duct 212 further include an intermediate through hole 2112, and the intermediate through hole 2112 is communicated with the receiving groove 2111 and the first air duct 11.

[0082] It can be understood that the shapes of the intermediate through holes 2112 of the first sub-air duct 211 and the second sub-air duct 212 can be the same or different. For example, they are both circular hole structures. By using the intermediate through hole 2112, the communication between the first air duct 11 and the receiving groove 2111 is realized, and the air delivery channels for detecting the explosion-proof valve 103 and the two pole columns 102 are independent of each other, reducing the mutual influence and interference.

[0083] Wherein, along the length direction of the bottom plate 1, the width of the middle through hole 2112 is smaller than the width of the accommodating groove 2111.

[0084] In this way, the part of the accommodating groove 2111 without the middle through hole 2112 can bear the pole column 102 or the explosion-proof valve 103, so as to provide a certain supporting force for the pole column 102 or the explosion-proof valve 103 of the top cover 100 to be detected. At the same time, waste of helium gas transportation is reduced, and the bending or corner of the helium gas transportation path can also be reduced, improving the helium gas transportation efficiency.

[0085] In one embodiment, as Figure 5 and Figure 7 shown, the second air passage 21 further includes a communication hole 213, and the communication hole 213 is located between the middle through hole 2112 and the first air passage 11 and is respectively connected to them. The communication hole 213 is a common passage for the first sub-air passage 211 and the second sub-air passage 212, and helium gas converges to the communication hole 213 through the first sub-air passage 211 and the second sub-air passage 212.

[0086] Wherein, the projections of the middle through hole 2112 of the first sub-air passage 211 and the middle through hole 2112 of the second sub-air passage 212 on the reference plane and the projection of the communication hole 213 on the reference plane partially overlap. The reference plane is the side of the mounting plate 2 facing the bottom plate 1, and the reference plane is perpendicular to the thickness direction of the bottom plate 1.

[0087] That is, the setting range of the communication hole 213 covers the range of the middle through holes 2112 of the first sub-air passage 211 and the second sub-air passage 212. Since the area of the communication hole 213 is relatively large, it can completely cover the middle through holes 2112 of the first sub-air passage 211 and the second sub-air passage 212, so that helium gas passing through the middle through holes 2112 of the first sub-air passage 211 and the second sub-air passage 212 can directly enter the communication hole 213, reducing the bending of the helium gas transportation path. At the same time, it can reduce the partial occlusion caused by the position offset of the first sub-air passage 211 and the second sub-air passage 212 not completely corresponding to the first air passage 11, affecting the transportation effect of helium gas.

[0088] Wherein, the projection of the communication hole 213 on the reference plane and the projections of the explosion-proof valve 103 and the two pole columns 102 of the top cover 100 to be detected on the reference plane partially overlap.

[0089] That is, the setting range of the communication hole 213 does not exceed the range of the explosion-proof valve 103 and the two pole columns 102, reducing waste of helium gas transportation.

[0090] In one embodiment, as Figure 5 and Figure 7As shown in the figure, the airtightness detection device further includes a second sealing structure 4, which is disposed between the mounting plate 2 and the top cover 100 to be detected. The second sealing structure 4 is annularly arranged on the side of the second air passage 21 away from the bottom plate 1.

[0091] During the detection, the pressing device presses down the top cover 100 to be detected, and the top cover 100 to be detected pushes the mounting plate 2 down. Since the second sealing structure 4 is disposed between the top cover 100 to be detected and the mounting plate 2, the sealing between the top cover 100 to be detected and the mounting plate 2 is achieved by squeezing the second sealing structure 4, so that a second sealing space is formed between the top cover 100 to be detected and the mounting plate 2. The second sealing space is communicated with the second air passage 21 to ensure the airtightness of the conveying channel during the helium gas transportation, and to avoid the situation of helium gas leakage or inaccurate airtightness detection of the top cover 100 to be detected.

[0092] Specifically, along the thickness direction of the bottom plate 1, at least one of the sides of the top cover 100 to be detected and the mounting plate 2 facing each other is provided with a second fixing groove for fixing the second sealing ring. For example, a second fixing groove is provided on the side of the mounting plate 2 facing the top cover 100 to be detected, and the second sealing ring is fixed in the second fixing groove.

[0093] Exemplarily, the second sealing structure 4 includes a second sealing ring and two third sealing rings. The second sealing ring is in a waist shape and matches the outer shape of the explosion-proof valve 103. The second sealing ring is annularly arranged around the first sub-air passage 211. The third sealing ring is in a square shape or a circular shape and is correspondingly arranged with the square pole 102 or the cylindrical pole 102. The third sealing ring is annularly arranged around the second sub-air passage 212.

[0094] Of course, in some other embodiments, the second sealing structure 4 can also be formed by coating a sealing glue on the top surface of the mounting plate 2. The specific form of the second sealing structure 4 is not limited in this embodiment, as long as the sealing can be achieved, it is within the protection scope of this embodiment.

[0095] In another embodiment, the second air passage 21 includes a second through hole (not shown in the figure), and the second through hole penetrates through the two side surfaces of the mounting plate 2 along the thickness direction of the bottom plate 1. Helium gas can be directly transported to the top cover 100 to be detected through the first air passage 11 and the second through hole in sequence, with a simple structure and relatively low production cost.

[0096] Among them, the projections of the explosion-proof valve 103 and the two poles 102 of the top cover 100 to be detected on the reference plane are located inside the projection of the second through hole on the reference plane, where the reference plane is the side surface of the mounting plate 2 facing the bottom plate 1.

[0097] That is, the range where the second through hole is provided extends throughout the explosion-proof valve 103 and the two pole posts 102. Since the area of the second through hole is relatively large, it can completely cover the explosion-proof valve 103 and the two pole posts 102, reducing the bending of the helium gas delivery path. At the same time, it can reduce the partial occlusion caused by the installation plate 2 not being completely aligned with the first air passage 11 due to position deviation, which affects the helium gas delivery effect.

[0098] If the size of the top cover 100 to be detected is relatively small, then the size of the installation plate 2 may also be reduced accordingly, resulting in the outer wall of the installation plate 2 not being able to fit against the inner wall of the installation groove 12, and there may be a situation of position deviation.

[0099] For this reason, the airtightness detection device further includes a limiting structure (not shown in the figure). The limiting structure is arranged in the installation groove 12 and is used to carry and limit the installation plate 2 to prevent the installation plate 2 from having a position deviation in the installation groove 12.

[0100] Specifically, the limiting structure can be multiple layers of steps arranged in the installation groove 12. According to the top covers 100 and installation plates 2 of different sizes to be detected, the installation plate 2 is placed on the steps at different positions to ensure that the installation plates 2 of different sizes can be well limited, improving the versatility.

[0101] In one embodiment, the airtightness detection device further includes a third sealing structure (not shown in the figure). The third sealing structure is arranged between the limiting structure and the installation plate 2. For example, the third sealing structure is respectively arranged on each layer of steps. By using the third sealing structure, it can be ensured that when the installation plate 2 overlaps on the steps of the limiting structure, the situation of poor sealing effect caused by suspension can be avoided.

[0102] Embodiment 2

[0103] As Figure 8 shown, this embodiment provides a helium detection fixture including a helium detection device (not shown in the figure), a pressing device 200 and an airtightness detection device. The airtightness detection device is arranged on the helium detection device, the pressing device 200 is arranged on the side of the airtightness detection device away from the helium detection device, and the top cover 100 to be detected is arranged between the airtightness detection device and the pressing device 200; wherein, the pressing device is configured to be able to press against the top cover 100 to be detected and push the top cover 100 to move in the direction towards the airtightness detection device, so that both sides of the installation plate 2 of the airtightness detection device are respectively pressed against the bottom plate 1 and the top cover 100 to be detected, and the helium detection device is used to detect the airtightness of the top cover 100 to be detected.

[0104] By using the pressing device 200 to press down the top cover 100 to be detected, the fixation of the top cover 100 to be detected is realized, avoiding the situation of position deviation of the top cover 100 to be detected, facilitating the helium detection device to perform airtightness detection on the top cover 100 to be detected, and ensuring the accuracy of the airtightness detection.

[0105] Specifically, the pressing device 200 includes a pressing driving source 201 and a pressing block 202. The pressing driving source 201 can be a downward pressing air cylinder or a driving motor. The output end of the pressing driving source 201 is connected to the pressing block 202. The pressing driving source 201 drives the pressing block 202 to move in the vertical direction. After the pressing block 202 presses against the top cover 100 to be detected, it continues to press down to fix the position between the top cover 100 to be detected and the airtightness detection device.

[0106] As Figure 8 - Figure 9 shown, the upper part of the pressing block 202 is connected to the output end of the pressing driving source 201 through a joint 2024. A relief groove 2021 is provided on the side of the pressing block 202 facing the airtightness detection device. The shape profile of the relief groove 2021 is adapted to the outer contour of the top cover 100 to be detected, and the relief groove 2021 is used to avoid the top cover 100 to be detected. A gas supply channel is provided in the pressing block 202 for transporting helium gas. Specifically, both ends of the transport channel have an air inlet and an air outlet 2022. The air inlet is provided on the side surface of the pressing block 202, and the helium gas generator is connected to the air inlet through a pipeline. The air outlet 2022 is provided at the bottom of the relief groove 2021. The helium gas generated from the helium gas generator is transported to the transport channel through the air inlet and ejected from the air outlet 2022.

[0107] Among them, a third sealing structure 5 is provided on the side of the airtightness detection device facing the pressing block 202. The third sealing structure 5 can be an O-ring. The third sealing structure 5 is arranged around the mounting plate 2. The side of the pressing block 202 facing the airtightness detection device has a pressing surface 2023. The pressing surface 2023 abuts against the third sealing structure 5 to form a first cavity between the pressing block 202 and the bottom plate 1. The air outlet 2022 is communicated with the first cavity. At this time, the first cavity can also be called the helium spraying end. With such a setting, the sealing effect between the pressing block 202 and the bottom plate 1 is ensured, so that the helium gas in the atmosphere will not enter the first cavity, and it can also ensure that the helium gas ejected from the air outlet 2022 is all sprayed onto the top cover 100 to be detected without leaking to the outside of the atmosphere.

[0108] At the same time, since the second sealing structure 4 is provided between the mounting plate 2 and the top cover 100 to be detected, a second sealing space is formed between the mounting plate 2 and the top cover 100 to be detected. The second sealing space is communicated with the first air passage 11 through the second air passage 21. At this time, the second sealing space can also be called the helium extraction detection end.

[0109] Specifically, after helium is delivered to the delivery channel through the air inlet, the helium is ejected into the first cavity through the air outlet 2022 to detect whether there is air leakage at the positive electrode post 102, the negative electrode post 102, and the explosion-proof valve 103 of the top cover 100 to be detected, so as to determine the airtightness of the top cover 100 to be detected at the positive electrode post 102, the negative electrode post 102, and the explosion-proof valve 103. If there is air leakage due to poor airtightness, the helium passes through the second sealing space and the second air duct 21 in sequence and is discharged from the first air duct 11. The first air duct 11 is communicated with the helium detection device, and the helium detection device is used to detect whether there is helium.

[0110] It should be particularly noted that the pressing block 202 can be used as the upper fixture, and the airtightness detection device can be used as the lower fixture. The airtightness detection device has two parts, a bottom plate 1 and a mounting plate 2. A first cavity is formed between the bottom plate 1 and the pressing block 202, and a second sealing space is formed between the mounting plate 2 and the top cover 100 to be detected. Since even if the size types of the top covers 100 to be detected are different, the bottom plate 1 is a common part, the bottom plate 1 can be directly fixed on the helium detection device. However, according to the top covers 100 to be detected with different sizes, the mounting plate 2 needs to be replaced correspondingly. The mounting plate 2 is a non-universal part, and the mounting plate 2 needs to be separately arranged from the bottom plate 1, that is, the mounting plate 2 is detachably connected to the bottom plate 1. Since there is a certain gap between the separately arranged bottom plate 1 and the mounting plate 2, the first sealing structure 3 is arranged between the bottom plate 1 and the mounting plate 2 to ensure the sealing performance between the bottom plate 1 and the mounting plate 2.

[0111] It should be noted here that only one example of applying the principle of the present invention is shown in the drawings and described in this specification. Those of ordinary skill in the art should clearly understand that the principle of the present invention is not limited to any details of the devices shown in the drawings or described in the specification or any components.

[0112] It should be understood that the present invention does not limit its application to the detailed structure and arrangement of the components proposed in this specification. The present invention can have other embodiments and can be implemented and executed in various ways. The foregoing variations and modifications fall within the scope of the present invention. It should be understood that the present invention disclosed and defined in this specification extends to all alternative combinations of two or more separate features mentioned or obvious in the text and / or drawings. All these different combinations constitute multiple alternative aspects of the present invention. The embodiments described in this specification illustrate the best mode known for implementing the present invention and will enable those skilled in the art to utilize the present invention.

[0113] Other embodiments of the present utility model will be readily contemplated by those skilled in the art after considering the specification and practicing the creation disclosed herein. The present utility model is intended to cover any variations, uses, or adaptations of the present utility model, which follow the general principles of the present utility model and include well-known general knowledge or conventional technical means in the technical field not disclosed in the present utility model. The specification and the exemplary embodiments are only regarded as exemplary, and the true scope and spirit of the present utility model are pointed out by the appended claims.

[0114] It should be understood that the present utility model is not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The protection scope of the present utility model is only limited by the appended claims.

Claims

1. An airtightness detection device, characterized in that, Comprising: A bottom plate for mounting a helium leak detection device, the bottom plate being provided with a first air passage; A mounting plate disposed on the bottom plate and detachably connected to the bottom plate, the mounting plate being used for carrying a top cover to be detected, and the mounting plate being provided with a second air passage corresponding to the first air passage; Wherein, the first air passage is communicated with the helium leak detection device, and the second air passage is communicated with the first air passage for detecting the airtightness of the top cover to be detected.

2. The airtightness detection device according to claim 1, wherein Further comprising: A first sealing structure disposed between the bottom plate and the mounting plate, the first sealing structure being annularly arranged on one side of the first air passage facing the mounting plate, and the first sealing structure being further annularly arranged on one side of the second air passage facing the bottom plate, so as to form a first sealed space between the bottom plate and the mounting plate, and the first sealed space is respectively communicated with the first air passage and the second air passage.

3. The airtightness detection device according to claim 1, characterized in that, Further comprising: A second sealing structure disposed between the mounting plate and the top cover to be detected, the second sealing structure being annularly arranged on one side of the second air passage away from the bottom plate, so as to form a second sealed space between the mounting plate and the top cover to be detected, and the second sealed space is communicated with the second air passage.

4. The airtightness detection device according to claim 1, characterized in that, One side of the bottom plate facing the mounting plate is provided with a mounting groove, the mounting plate is disposed in the mounting groove, and the first air passage is disposed at the bottom of the mounting groove and communicated with the mounting groove.

5. The airtightness detection device according to claim 4, characterized in that Further comprising: A limiting structure disposed in the mounting groove, the limiting structure being used for carrying and limiting the mounting plate; A third sealing structure disposed between the limiting structure and the mounting plate.

6. The airtightness detection device according to claim 1, wherein The second air passage includes a first sub-air passage and two second sub-air passages, the two second sub-air passages are disposed on both sides of the first sub-air passage along the length direction of the bottom plate, the position of the explosion-proof valve of the top cover to be detected corresponds to the first sub-air passage, and the position of the pole hole of the top cover to be detected corresponds to the second sub-air passage.

7. The airtightness detection device according to claim 6, characterized in that, Both the first sub-air passage and the second sub-air passage include a receiving groove and a middle through hole, the pole or explosion-proof valve of the top cover to be detected is disposed in the receiving groove, and the middle through hole is communicated with the receiving groove and the first air passage; Wherein, along the length direction of the bottom plate, the width of the middle through hole is smaller than the width of the receiving groove.

8. The airtightness detection device according to claim 7, characterized in that, The second air passage further includes a communication hole, and the communication hole is located between the middle through hole and the first air passage and is respectively communicated with them; Wherein, the projections of the middle through holes of the first sub-air passage and the second sub-air passage on a reference plane and the projection of the communication hole on the reference plane partially overlap; Wherein, the reference plane is the side surface of the mounting plate facing the bottom plate, and the reference plane is perpendicular to the thickness direction of the bottom plate.

9. The airtightness detection device according to claim 1, wherein The second air passage includes a second through hole, and the second through hole penetrates through two side surfaces of the mounting plate along the thickness direction of the bottom plate; Wherein, the projections of the explosion-proof valve and two pole columns of the top cover to be detected on a reference plane and the projection of the second through hole on the reference plane partially overlap, wherein the reference plane is the side surface of the mounting plate facing the bottom plate, and the reference plane is perpendicular to the thickness direction of the bottom plate.

10. The airtightness detection device according to claim 1, characterized in that, The first air passage includes a first through hole, and the shape of the first through hole is at least one of circular, waist-shaped, oval, and polygonal; And / or, the first air passage includes a first through hole, and the projection of the first through hole on the reference plane is located inside the projection of the second air passage on the reference plane, where the reference plane is the side of the mounting plate facing the bottom plate, and the reference plane is perpendicular to the thickness direction of the bottom plate; And / or, the first air passage includes a first through hole, the number of the first through holes is one, and one first through hole is arranged in the middle of the bottom plate along the length direction of the bottom plate, or the number of the first through holes is multiple, and multiple first through holes are arranged at intervals along the length direction of the bottom plate.

11. A helium detection fixture, characterized in that, It includes a helium leak detection device, a pressing device, and the airtightness detection device according to any one of claims 1 to 10. The airtightness detection device is arranged on the helium leak detection device, the pressing device is arranged on the side of the airtightness detection device away from the helium leak detection device, and the top cover to be detected is arranged between the airtightness detection device and the pressing device; Wherein, the pressing device is configured to be able to press the top cover to be detected and push the top cover to be detected in the direction towards the airtightness detection device, so that both sides of the mounting plate of the airtightness detection device are respectively pressed against the bottom plate and the top cover to be detected, and the helium leak detection device is used to detect the airtightness of the top cover to be detected.

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