Helium detection device

Abstract

A helium detection device comprises a first pressing plate, a second pressing plate, a first sealing ring and a second sealing ring, and the first pressing plate is provided with a first air exhaust cavity and a second air exhaust cavity; the first sealing ring and the second sealing ring are arranged on the first pressing plate and both protrude out of the surface, provided with the first air exhaust cavity and the second air exhaust cavity, of the first pressing plate, the first sealing ring is arranged on the first air exhaust cavity in a surrounding mode, and the second sealing ring is arranged on the second air exhaust cavity in a surrounding mode. The second pressing plate and the first pressing plate are oppositely arranged; the second pressing plate is provided with a first air inlet cavity and a second air inlet cavity; the second pressing plate further comprises a first annular boss and a second annular boss, the first annular boss and the second annular boss both protrude out of the surface, provided with the first air inlet cavity and the second air inlet cavity, of the second pressing plate, the first annular boss is arranged in the first air inlet cavity in a surrounding mode, and the second annular boss is arranged in the second air inlet cavity in a surrounding mode. In this way, the accuracy of air tightness detection of the end cover assembly can be improved, and the situations of wrong detection and missing detection are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection of end covers of energy storage devices, in particular to a helium detection device. Background Art

[0002] Energy storage devices primarily use secondary batteries as a means of storing energy. Secondary batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged to reactivate their active materials after discharge, allowing for continued use. Energy storage devices include end cap assemblies, which are mounted to the housing to seal the battery cells within it. Before installation, the end cap assemblies must undergo airtightness testing to ensure proper sealing.

[0003] Currently, air tightness testing is mainly performed using a helium detection device. However, due to the unreasonable design of the current helium detection device, when the end cover assembly is compressed, the end cover assembly is unevenly stressed near the pole, which may cause a gap between the end cover assembly and the sealing ring, causing helium to leak through the gap into the helium detection system. As a result, the helium detection results are irrelevant to the actual air tightness of the end cover assembly, resulting in problems such as missed detection and incorrect detection of the air tightness of the end cover assembly. Utility Model Content

[0004] The utility model aims to provide a helium detection device to solve the problems of missed detection and wrong detection in air tightness detection.

[0005] In order to achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0006] The utility model provides a helium detection device for detecting the air tightness of an end cover assembly of an energy storage device, the helium detection device comprising:

[0007] A first pressing plate having an air pumping channel, a first air pumping cavity and a second air pumping cavity, wherein the first air pumping cavity and the second air pumping cavity are spaced apart from each other on the first pressing plate, and the air pumping channel is in communication with the first air pumping cavity and the second air pumping cavity;

[0008] A first sealing ring and a second sealing ring are provided on the first pressing plate and both protrude from a surface of the first pressing plate where the first and second air pumping cavities are formed. The first sealing ring surrounds the first air pumping cavity, and the second sealing ring surrounds the second air pumping cavity.

[0009] a second pressure plate, disposed opposite the first pressure plate; the second pressure plate having an air inlet passage, a first air inlet cavity, and a second air inlet cavity, the air inlet passage being in communication with the first air inlet cavity and the second air inlet cavity; the second pressure plate further comprising a first annular boss and a second annular boss, the first annular boss and the second annular boss both protruding from a surface of the second pressure plate defining the first and second air inlet cavities, the first annular boss surrounding the first air inlet cavity, and the second annular boss surrounding the second air inlet cavity;

[0010] In which, the first pressure plate and the second pressure plate are used to move towards or away from each other, the first air pumping cavity is opposite to the first air inlet cavity, the second air pumping cavity is opposite to the second air inlet cavity, the first sealing ring is opposite to the first annular boss, and the second sealing ring is opposite to the second annular boss.

[0011] By providing the first annular boss and the second annular boss, a uniform force can be applied to the insulating parts around the first pole and the second pole, so that each position of the cover plate and the first sealing ring and the second sealing ring are in a tight contact state, thereby preventing helium from entering the air extraction cavity through the gap between the cover plate and the sealing ring, thereby improving the accuracy of the airtightness detection of the end cover assembly and avoiding the occurrence of false detection and missed detection.

[0012] In one embodiment, the first pressing plate further has a third air pumping cavity, the third air pumping cavity is located between the first air pumping cavity and the second air pumping cavity, and the air pumping channel is connected to the third air pumping cavity;

[0013] The helium detection device further includes a third sealing ring, which is disposed on the first pressure plate and protrudes from a surface of the first pressure plate where the third air pumping cavity is located, and surrounds the third air pumping cavity.

[0014] The second pressing plate further has a third air inlet cavity, the third air inlet cavity is located between the first air inlet cavity and the second air inlet cavity, and the air inlet channel is connected to the third air inlet cavity;

[0015] The second pressure plate further includes a first boss and a second boss arranged at intervals, the first annular boss, the first boss, the second boss and the second annular boss are arranged in sequence along the first direction, and the first boss and the second boss are respectively located on both sides of the third air inlet cavity in the first direction;

[0016] The third air extraction cavity is opposite to the third air inlet cavity, and the third sealing ring is opposite to the first boss and the second boss.

[0017] The provision of the first boss and the second boss further improves the accuracy of the air tightness detection of the end cover assembly.

[0018] First embodiment

[0019] In one embodiment, the first annular boss and the second annular boss are each formed by sequentially connecting multiple sections, the width of each section is 2mm-5mm, and the width of each of the first boss and the second boss is 3mm-10mm.

[0020] Setting appropriate width ranges for the first annular boss, the second annular boss, the first boss, and the second boss can ensure that the insulating member is not crushed, while avoiding interference with the structure on the insulating member and can stably and evenly compress the insulating member.

[0021] In one embodiment, the first annular boss includes a first section away from the second annular boss, the second annular boss includes a second section away from the first annular boss, and the width of each of the first section and the second section is 2 mm to 3 mm.

[0022] The width of the first section and the second section is set to 2mm-3mm, which can adapt to the narrow gap between the first pole and the first sinking platform, and between the second pole and the second sinking platform. While being able to compress the insulating part, the width is not too small to avoid damaging the insulating part.

[0023] In one embodiment, the protrusion heights of the first annular boss, the second annular boss, the first boss, and the second boss relative to the surfaces on which they are located are not less than 0.2 mm.

[0024] The protrusion heights of the first annular boss, the second annular boss, the first boss, and the second boss are set to be no less than 0.2 mm, so that the surfaces on which they are located will not press on the insulating part, ensuring that only the first annular boss, the second annular boss, the first boss, and the second boss are pressed on the insulating part, thereby ensuring that the first sealing ring, the second sealing ring, and the third sealing ring are subjected to uniform force, avoiding the generation of local gaps between them and the cover plate.

[0025] In one embodiment, a first annular groove is provided near the four edges of the first air pumping cavity, a second annular groove is provided near the four edges of the second air pumping cavity, and a third annular groove is provided near the four edges of the third air pumping cavity. The first sealing ring is accommodated in the first annular groove, the second sealing ring is accommodated in the second annular groove, and the third sealing ring is accommodated in the third annular groove.

[0026] By providing the first annular groove, the second annular groove and the third annular groove, the first sealing ring, the second sealing ring and the third sealing ring can be easily installed, and the structure is simple.

[0027] In one embodiment, the first pressure plate includes a first surface, and the helium detection device further includes a fourth sealing ring, which is disposed on the first surface and surrounds the first sealing ring, the second sealing ring, and the third sealing ring.

[0028] The fourth sealing ring is set so that after the first pressure plate and the second pressure plate press the fourth sealing ring, the first pressure plate, the second pressure plate and the fourth sealing ring enclose a closed space, and the space can only be connected to the outside world through the air inlet channel and the air exhaust channel, thereby ensuring that no other external air enters the space and affects the air tightness test of the end cover assembly, thereby ensuring the accuracy of the air tightness test.

[0029] In one embodiment, a cavity is provided on the first surface, and the first air pumping cavity, the second air pumping cavity and the third air pumping cavity are provided on the bottom wall of the cavity. The first sealing ring, the second sealing ring and the third sealing ring are arranged on the bottom wall of the cavity and are adjacent to the corresponding openings of the first air pumping cavity, the second air pumping cavity and the third air pumping cavity. The fourth sealing ring is arranged on the first surface and surrounds the cavity. The cavity is used to accommodate the end cover assembly.

[0030] By opening a cavity, the space enclosed by the first pressure plate, the second pressure plate and the fourth sealing ring includes the cavity for accommodating the end cover assembly, so that the first pressure plate and the second pressure plate can be very close when the end cover assembly is pressed, so that the fourth sealing ring can adopt conventional specifications, with a simple structure and low cost.

[0031] In one embodiment, a mounting groove is provided on the side wall of the cavity.

[0032] By providing the mounting groove on the side wall of the cavity, the space of the mounting groove can be utilized when placing or removing the end cover assembly into the cavity, thereby facilitating the operation.

[0033] In one embodiment, the second pressure plate includes a second surface opposite to the first surface, and the second pressure plate includes a first pressure block and a second pressure block arranged at intervals along the first direction, the first pressure block and the second pressure block protrude from the second surface, the first pressure block is provided with the first air inlet cavity on the surface facing the first pressure plate, and the second pressure block is provided with the second air inlet cavity on the surface facing the first pressure plate, the space between the first pressure block and the second pressure block forms the third air inlet cavity, the first annular boss and the first boss are provided on the first pressure block, and the second annular boss and the second boss are provided on the second pressure block.

[0034] A first pressing block and a second pressing block are provided protruding from the second surface and can extend into the cavity so that the first annular boss, the second annular boss, the first boss and the second boss can press the first substrate and the second substrate.

[0035] In one embodiment, a first channel is opened on the surface of the first pressure block facing the first pressure plate, and a second channel is opened on the surface of the second pressure block facing the first pressure plate. The first channel connects the first air inlet cavity and the third air inlet cavity, and the second channel connects the second air inlet cavity and the third air inlet cavity.

[0036] By providing the first channel and the second channel, the first air inlet cavity, the second air inlet cavity and the third air inlet cavity can be interconnected, and the helium gas can fill each air inlet cavity as quickly as possible, thereby speeding up the helium inspection process.

[0037] In one embodiment, a receiving groove is provided on the second surface, the first pressure block and the second pressure block are arranged on the bottom wall of the receiving groove, and the first pressure block and the second pressure block are spaced from the side wall of the receiving groove, the first pressure block is provided with a first notch on the surface facing the first pressure plate, and the second pressure block is provided with a second notch on the surface facing the first pressure plate, the first notch connects the first air inlet cavity and the receiving groove, the second notch connects the second air inlet cavity and the receiving groove, and the air inlet channel is also connected to the receiving groove.

[0038] By arranging the first pressing block and the second pressing block to have a gap with the side wall of the receiving groove, the gap formed can accommodate the first sinking platform, the second sinking platform and other structures, and the first gap and the second gap are opened, so that the receiving groove and each air inlet cavity can be connected to each other, so that helium can fill each space as quickly as possible, which is conducive to speeding up the progress of helium detection.

[0039] In one embodiment, the first pressure block has a first relief groove on its surface facing the first pressure plate, and the second pressure block has a second relief groove on its surface facing the second pressure plate. This allows the injection protrusion to be accommodated in the corresponding first or second relief groove, improving the versatility of the helium detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 is a perspective view of an end cap assembly according to an embodiment;

[0042] Figure 2 is a perspective view of an end cap assembly from another perspective of an embodiment;

[0043] Figure 3 is an exploded view of a portion of the helium detection device in the first embodiment;

[0044] Figure 4 is a perspective view of the first embodiment and the second pressing plate;

[0045] Figure 5 is a perspective view of the first pressing plate in the first embodiment;

[0046] Figure 6 1 is a schematic diagram of the planar pressure exerted by the helium detection device on the end cover assembly in the first embodiment;

[0047] Figure 7 1 is a schematic diagram of the side view of the pressure of the helium detection device on the end cover assembly in the first embodiment;

[0048] Figure 8 is a perspective view of a helium detection device according to a second embodiment;

[0049] Figure 9 This is a partial structural perspective view of a helium detection device according to a second embodiment;

[0050] Figure 10 This is a partial structural exploded view of the helium detection device of the second embodiment;

[0051] Figure 11 is a partial structural cross-sectional view of a helium detection device according to a second embodiment;

[0052] Figure 12 is a perspective view of the first pressure plate and each sealing ring of the second embodiment;

[0053] Figure 13 is a perspective view of a second pressing plate of the second embodiment;

[0054] Figure 14 4 is a plan view of the second pressing plate of the second embodiment.

[0055] Description of reference numerals:

[0056] 100 - end cap assembly, 11 - cover plate, 12 - insulation member, 121 - first substrate, 122 - second substrate, 123 - first sink, 124 - second sink, 125 - explosion-proof sink, 1251 - air hole, 126 - injection protrusion, 13 - first pole, 14 - second pole, 15 - explosion-proof valve;

[0057] 21-pressing plate 1, 211-storage chamber, 212-exhaust chamber 1, 213-exhaust chamber 2, 214-exhaust chamber 3, 22-pressing plate 2, 221-boss 1, 222-boss 2, 223-pressing glue 1, 224-pressing glue 2, 23-sealing ring 1, 24-sealing ring 2, 25-sealing ring 3, 26-sealing ring 4, 27-secondary sealing ring;

[0058] 31-first pressing plate, 311-first air pumping cavity, 312-second air pumping cavity, 313-third air pumping cavity, 314-receiving cavity, 315-first annular groove, 316-second annular groove, 317-third annular groove, 318-fourth annular groove, 319-mounting groove, 32-second pressing plate, 3211-first air inlet cavity, 3212-second air inlet cavity, 3213-third air inlet cavity, 322-first annular boss, 3221-first section, 323-second annular boss, 3231-second section, 324-first boss, 325-second boss, 326-first pressing block, 327-second pressing block, 32 81-first channel, 3282-second channel, 3283-first notch, 3284-second notch, 3285-first avoidance groove, 3286-second avoidance groove, 329-receiving groove, 331-first sealing ring, 332-second sealing ring, 333-third sealing ring, 334-fourth sealing ring, 34-support frame, 341-support plate, 342-guide column, 343-movable plate, 35-driver, 351-air inlet connector, 352-air outlet connector, 36-air supply connector, 37-exhaust connector, 301-exhaust channel, 302 air inlet channel, 303-first surface, 304-second surface. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0061] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meanings as commonly understood by those skilled in the art to which this utility model belongs. The terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more of the relevant listed items.

[0062] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0063] The helium detection device of the embodiment of the present utility model is used to detect the airtightness of the end cover assembly 100 of the energy storage device. Figure 1 and Figure 2 The energy storage device includes a housing (not shown), a battery cell (not shown), and an end cap assembly 100. After the end cap assembly 100 is connected to the battery cell, it is installed in the housing as a whole, and the end cap assembly 100 is connected and fixed to the housing to seal the housing. However, during the actual manufacturing process, the end cap assembly 100 may not be completely sealed due to poor airtightness, affecting the safety performance of the battery. Therefore, the airtightness of the end cap assembly 100 needs to be tested, and only after passing the test can it be used to assemble into an energy storage device.

[0064] The end cover assembly 100 includes a cover plate 11, an insulating member 12, a first pole 13, a second pole 14 and an explosion-proof valve 15. The cover plate 11 is generally flat and can be made of aluminum alloy. It is welded to the shell to seal the space inside the shell. The insulating member 12 is arranged on the cover plate 11. The insulating member 12 can be made of plastic material and is used to separate the battery cell and the cover plate 11 to avoid electrical abnormalities of the cover plate 11. The first pole 13 and the second pole 14 are both passed through the cover plate 11 and the insulating member 12, and each protrudes from the surface of the cover plate 11 facing away from the insulating member 12, and protrudes from the surface of the insulating member 12 facing away from the cover plate 11. One of the first pole 13 and the second pole 14 is the positive pole, and the other is the negative pole. A sealing ring or the like can be provided between the first pole 13, the second pole 14 and the cover plate 11 and the insulating member 12 for sealing. The explosion-proof valve 15 is provided on the cover plate 11 and is located between the first pole 13 and the second pole 14 . The insulating member 12 is provided with an air hole 1251 communicating with the explosion-proof valve 15 .

[0065] The insulating member 12 may include a first substrate 121, a second substrate 122, a first sink 123, a second sink 124 and an explosion-proof sink 125. The first substrate 121 and the second substrate 122 are spaced apart and are both laid flat on the cover 11. The first sink 123 is arranged at an end of the first substrate 121 away from the second substrate 122, and the second sink 124 is arranged at an end of the second substrate 122 away from the first substrate 121. The explosion-proof sink 125 is arranged between the first substrate 121 and the second substrate 122, and the explosion-proof sink 125 is provided with an air hole 1251. The first sink 123, the second sink 124 and the explosion-proof sink 125 all protrude from the surfaces of the first substrate 121 and the second substrate 122 facing away from the cover 11. The first pole 13 is provided through the cover plate 11 and the first base plate 121, and the first pole 13 protrudes from the surface of the first base plate 121 facing away from the cover plate 11. The second pole 14 is provided through the cover plate 11 and the second base plate 122, and the second pole 14 protrudes from the surface of the second base plate 122 facing away from the cover plate 11. The explosion-proof sink 125 corresponds to the explosion-proof valve 15.

[0066] The above structure of the insulating member 12 can be an integrated whole. The insulating member 12 can also be made up of multiple structures. For example, Figure 1 and Figure 2 It is shown that the first base plate 121 , the first sinking platform 123 and the explosion-proof sinking platform 125 are an integrated structure, and the second base plate 122 and the second sinking platform 124 are an integrated structure, which are spliced ​​together to form the entire insulating member 12 .

[0067] The cover plate 11 and insulating member 12 may also be provided with injection holes. After the end cap assembly 100 is assembled into the energy storage device, electrolyte can be injected into the housing through the injection holes. Optionally, the injection holes are provided in the second substrate 122, and the second substrate 122 is provided with injection protrusions 126. The injection protrusions 126 are located around the injection holes and protrude from the surface of the second substrate 122 facing away from the cover plate 11. After injection is completed, the injection hole can be blocked with an injection plug, which can cooperate with the injection protrusions 126 to achieve a secure connection.

[0068] When performing an airtightness test on the end cover assembly 100 , it is necessary to check whether there are gaps between the first pole 13 , the second pole 14 , the explosion-proof valve 15 and the cover plate 11 that may cause air leakage.

[0069] Please refer to Figures 3 to 5 In the first embodiment, a helium inspection device is used to inspect the airtightness of the end cap assembly 100. The helium inspection device includes a first pressing plate 21, a second pressing plate 22, and a plurality of sealing rings. The sealing rings are mounted on the first pressing plate 21. The second pressing plate 22 presses the end cap assembly 100 against the first pressing plate 21. The cover plate 11 of the end cap assembly 100 is in close contact with the sealing rings.

[0070] refer to Figure 4The second pressing plate 22 is used to press the insulating part 12. The second pressing plate 22 has a boss 1 221, a boss 2 222, a glue 1 223 and a glue 2 224. The boss 1 221 and the boss 2 222 are arranged at intervals. The end of the boss 1 221 away from the boss 2 222 is provided with a first groove, and the end of the boss 2 222 away from the boss 1 221 is provided with a second groove. The glue 1 223 is arranged in the first groove, and the glue 2 224 is arranged in the second groove. The glue 1 223 and the glue 2 224 are pressure-deformable structures.

[0071] refer to Figure 5 The pressure plate 1 21 is provided with a storage chamber 211, an air extraction chamber 1 212, an air extraction chamber 2 213, and an air extraction chamber 3 214. The air extraction chamber 1 212, the air extraction chamber 2 213, and the air extraction chamber 3 214 are arranged on the bottom wall of the storage chamber 211. A plurality of sealing rings include a sealing ring 1 23, a sealing ring 24, a sealing ring 3 25, a sealing ring 4 26, and a secondary sealing ring 27. The sealing ring 1 23 is arranged around the air extraction chamber 1 212, the sealing ring 24 is arranged around the air extraction chamber 213, the sealing ring 3 25 is arranged around the air extraction chamber 3 214, and the sealing ring 4 26 is arranged around the storage chamber 211. The secondary sealing ring 27 is arranged on the bottom wall of the storage chamber 211 and is arranged around the sealing rings 1 23, 24, and 3 25.

[0072] Combine Figures 1 to 5 When testing the airtightness of end cap assembly 100, pressure plate 1 21 and pressure plate 2 22 are relatively close together. The first and second adhesives 223 and 224 of pressure plate 22 respectively press against insulating member 12, while pressure plate 1 21 presses against sealing ring 4 26. The surface of cover plate 11 facing away from insulating member 12 is in close contact with sealing ring 1 23, sealing ring 24, sealing ring 3 25, and secondary sealing ring 27. The first pole 13 is housed in pumping chamber 1 212, the second pole 14 is housed in pumping chamber 2 213, and the explosion-proof valve 15 corresponds to pumping chamber 3 214. In this manner, pressure plate 1 21, pressure plate 2 22, and sealing ring 4 26 collectively enclose a closed space. Pressure plate 2 2 has a channel 1 internally connected to the sealed space, allowing helium to be injected into the closed space. Pressure plate 1 21 has a channel 2 connected to pumping chamber 1 212, pumping chamber 2 213, and pumping chamber 3 214. Because cover plate 11 compresses sealing ring 1 23, sealing ring 2 24, and sealing ring 3 25, the three pumping chambers are isolated from the aforementioned closed space. Pumping air through channel 2 can be used to check the airtightness of end cap assembly 100. If end cap assembly 100 is properly sealed at first pole 13, second pole 14, and explosion-proof valve 15, no helium will leak into pumping chamber 1 212, pumping chamber 2 213, and pumping chamber 3 214 and be detected by channel 2. Conversely, if helium is detected flowing out of channel 2, it indicates that end cap assembly 100 is not airtight.

[0073] refer to Figure 3 、 Figure 4 and Figure 6 Since the pressed glue 1 223 and the pressed glue 2 224 are pressure-deformable structures, they will be deformed after repeated use, causing the boss 1 221 and the boss 2 222 to press the insulating part 12. Since the boss 1 221 has a first groove and the boss 2 222 has a second groove, the insulating part 12 corresponding to the openings of the first groove and the second groove is basically not subjected to pressure. Figure 6 The middle section line shows the stress-bearing area of ​​the insulating member 12 , wherein in the area circled by the dotted frame C, the side of the first pole 13 away from the second pole 14 and the side of the second pole 14 away from the first pole 13 are not subjected to pressure. Figure 6 The stress situation in the area circled by the dotted box C is as follows Figure 7 As shown, the insulating member 12 is subjected to force only in the area between the first pole 13 and the explosion-proof valve 15 and in the area between the second pole 14 and the explosion-proof valve 15. The overall resultant force is roughly located in the middle of the length direction of the end cover assembly 100, which causes the middle area of ​​the length direction of the end cover assembly 100 to bend downward.

[0074] refer to Figure 5 , as Figure 6 When the area circled by the dotted line frame C bends downward in the middle area of ​​the end cover assembly 100, the sealing ring 1 23 and the sealing ring 2 24 are each close to a section of the sealing ring 3 25 (such as Figure 5 As shown in A in the middle) the pressure is large and can have a good seal with the cover plate 11, and the sealing ring 1 23 and the sealing ring 2 24 are each away from the sealing ring 3 25 (as shown in Figure 5 The pressure on the cover plate 11 is small or even unaffected, so there may be a gap between the cover plate 11 and the helium in the aforementioned enclosed space, which causes the helium in the enclosed space to enter the vacuum chamber 1 212 and the vacuum chamber 2 213 through the gaps between the cover plate 11 and the sealing ring 1 23 and the sealing ring 2 24, respectively, which are away from the sealing ring 3 25. As a result, the result of the airtightness test of the end cover assembly 100 cannot correctly reflect the airtightness of the end cover assembly 100 itself, resulting in missed detection and wrong detection.

[0075] In view of the above-mentioned problems existing in the first embodiment, the second embodiment of the present invention provides a new type of helium detection device, which is described in detail below.

[0076] Please refer to Figure 8The second embodiment of the present invention provides a helium detection device for detecting the airtightness of an end cap assembly 100 of an energy storage device. The end cap assembly 100 in the second embodiment of the present invention may be the end cap assembly 100 in the first embodiment, or may be different from the end cap assembly 100 in the first embodiment. The helium detection device in this second embodiment includes a first pressure plate 31 and a second pressure plate 32. The function of the first pressure plate 31 is similar to that of the aforementioned pressure plate 1 21, and the function of the second pressure plate 32 is similar to that of the aforementioned pressure plate 22. The first pressure plate 31 and the second pressure plate 32 are arranged relative to each other and can be close to or away from each other.

[0077] Optionally, the helium detection device further includes a support frame 34 and a driver 35. The first pressure plate 31 and the second pressure plate 32 are both mounted on the support frame 34, and at least one of the first pressure plate 31 and the second pressure plate 32 is movably connected to the support frame 34. The driver 35 is disposed on the support frame 34 and is used to drive the first pressure plate 31 and the second pressure plate 32 to move toward or away from each other.

[0078] In a specific embodiment, the support frame 34 includes a support plate 341, a guide column 342 and a movable plate 343. The guide columns 342 are arranged in a plurality at intervals and are connected to the support plate 341 at one end and to the first pressure plate 31 at the other end. The movable plate 343 is arranged between the first pressure plate 31 and the support plate 341. The movable plate 343 is provided with a plurality of sliding holes, and a plurality of guide columns 342 are passed through the plurality of sliding holes in a one-to-one correspondence. The second pressure plate 32 is arranged on the side of the movable plate 343 facing the first pressure plate 31. The driver 35 is a pneumatic cylinder, and the cylinder body of the pneumatic cylinder is arranged on the surface of the support plate 341 facing away from the movable plate 343, and the telescopic rod of the pneumatic cylinder (not shown in the figure) is passed through the support plate 341 and connected to the movable plate 343. The cylinder body is connected to an air inlet connector 351 and an air outlet connector 352, which are used to communicate with a gas supply system (not shown). By controlling the flow rate of air inlet and outlet, the length of the telescopic rod extending out of the cylinder body can be adjusted, thereby driving the movable plate 343 to move along the extension direction of the guide column 342, so that the second pressure plate 32 moves closer to or away from the first pressure plate 31. Optionally, the pneumatic cylinder can also be replaced with a hydraulic cylinder, a motor, etc., without limitation.

[0079] There can be one or more pneumatic cylinders. If there are multiple pneumatic cylinders, they are arranged at intervals and can enable each position of the movable plate 343 to move at the same speed, and provide basically the same pressure to each part of the movable plate 343 when the second pressure plate 32 presses the end cover assembly 100 against the first pressure plate 31, so that the pressure at each part of the end cover assembly 100 is basically equal.

[0080] There can be four guide rods in total. The first pressure plate 31, the second pressure plate 32, the support plate 341 and the movable plate 343 can all be roughly rectangular plate structures. The four guide rods correspond to the four corners of the first pressure plate 31, the second pressure plate 32, the support plate 341 and the movable plate 343. This arrangement can enable the guide rods to guide stably and improve stability.

[0081] The helium detection device may further include a helium supply system (not shown) and a helium detection system (not shown). The helium supply system is used to communicate with the air inlet channel 302 (refer to FIG. Figure 11 ) is connected to the helium detection system for connecting to the exhaust channel 301 of the first pressure plate 31 (reference Figure 11 ). After the second pressing plate 32 and the first pressing plate 31 compress the end cap assembly 100, the helium supply system inputs helium to the second pressing plate 32 and extracts helium from the first pressing plate 31 through the helium detection system. The amount of helium detected by the helium detection system can be used to determine the airtightness of the end cap assembly 100.

[0082] refer to Figures 8 to 11 The helium detection device also includes a gas supply connector 36 and a gas extraction connector 37. The gas supply connector 36 is connected to the second pressure plate 32 and communicates with the gas inlet channel 302. The gas extraction connector 37 is connected to the first pressure plate 31 and communicates with the gas extraction channel 301. The gas supply connector 36 is connected to the helium supply system, and the gas extraction connector 37 is connected to the helium detection system. Specifically, they can be connected through corresponding pipelines (not shown).

[0083] The second pressure plate 32 has an air inlet channel 302. The air inlet channel 302 may include multiple air inlet sub-channels. The inlet of each air inlet sub-channel may be set on the four sides of the second pressure plate 32, and the outlet is set on the surface of the second pressure plate 32 facing the first pressure plate 31. There are also multiple air supply connectors 36, which are connected to the inlet of each air inlet sub-channel in a one-to-one correspondence. In this way, each air supply connector 36 will not interfere with the movable plate 343. Optionally, each air inlet sub-channel may be independent of each other and not connected to each other. Alternatively, some or all of the air inlet sub-channels may be connected to each other.

[0084] The first pressing plate 31 has an air extraction channel 301. The air extraction channel 301 may include multiple air extraction sub-channels, each of which has an inlet located on the surface of the first pressing plate 31 facing the second pressing plate 32 and an outlet located on the side of the first pressing plate 31 or on the surface facing away from the second pressing plate 32. The air extraction connector 37 is connected to the outlet of the air extraction channel 301. In a specific embodiment, the air extraction sub-channels are interconnected and have a common outlet located on the surface of the first pressing plate 31 facing away from the second pressing plate 32.

[0085] The first pressing plate 31 further has a first air pumping cavity 311 and a second air pumping cavity 312, which are spaced apart from each other on the first pressing plate 31. The air pumping channel 301 is in communication with the first air pumping cavity 311 and the second air pumping cavity 312, specifically, one of the air pumping sub-channels is in communication with the first air pumping cavity 311, and the other air pumping sub-channel is in communication with the second air pumping cavity 312.

[0086] refer to Figure 9 and Figure 10 The helium detection device further includes a first sealing ring 331 and a second sealing ring 332. The first sealing ring 331 and the second sealing ring 332 are disposed on the first pressure plate 31 and both protrude from the surface of the first pressure plate 31 defining the first and second pumping cavities 311, 312. The first sealing ring 331 surrounds the first pumping cavity 311, and the second sealing ring 332 surrounds the second pumping cavity 312.

[0087] The second pressing plate 32 is disposed opposite the first pressing plate 31. The second pressing plate 32 further has a first air inlet cavity 3211 and a second air inlet cavity 3212, which are spaced apart from each other on the second pressing plate 32. The air inlet channel 302 communicates with the first air inlet cavity 3211 and the second air inlet cavity 3212. The air inlet channel 302 communicates with the first air inlet cavity 3211 and the second air inlet cavity 3212. Specifically, one of the air inlet sub-channels communicates with the first air inlet cavity 3211, and the other air inlet sub-channel communicates with the second air inlet cavity 3212.

[0088] The second pressure plate 32 further includes a first annular boss 322 and a second annular boss 323. Both the first annular boss 322 and the second annular boss 323 protrude from the surface of the second pressure plate 32 defining the first air inlet cavity 3211 and the second air inlet cavity 3212. The first annular boss 322 surrounds the first air inlet cavity 3211, while the second annular boss 323 surrounds the second air inlet cavity 3212. The first annular boss 322 and the second annular boss 323 each have an annular shape, connected end to end, and protrude relative to the surface on which they are located.

[0089] The first air extraction cavity 311 is opposite to the first air inlet cavity 3211, the second air extraction cavity 312 is opposite to the second air inlet cavity 3212, the first sealing ring 331 is opposite to the first annular boss 322, and the second sealing ring 332 is opposite to the second annular boss 323. The first pressing plate 31 and the second pressing plate 32 move toward or away from each other, so that the first annular boss 322, the second annular boss 323, the first sealing ring 331 and the second sealing ring 332 press the end cap assembly 100. The first air extraction cavity 311 and the first air inlet cavity 3211 accommodate the first pole 13, and the second air extraction cavity 312 and the second air inlet cavity 3212 accommodate the second pole 14.

[0090] Specifically, the cover plate 11 of the end cover assembly 100 is in close contact with the first sealing ring 331 and the second sealing ring 332, so that the first air pumping cavity 311 and the second air pumping cavity 312 are closed spaces. The locations where helium may leak into the first air pumping cavity 311 and the second air pumping cavity 312 are the gaps between the cover plate 11 and the first pole 13 and the second pole 14, and the gaps between the cover plate 11 and the first sealing ring 331 and the second sealing ring 332.

[0091] The second embodiment features a unique design for the second pressure plate 32, namely, a first annular boss 322 and a second annular boss 323. The first and second annular bosses 322, 323 protrude relative to their respective surfaces, and the first and second sealing rings 331, 332 also protrude relative to their respective surfaces. As the second pressure plate 32 gradually approaches the first pressure plate 31, the first and second annular bosses 322, 323 contact and apply pressure to the insulating member 12. The insulating member 12 transmits the pressure to the cover plate 11, causing the cover plate 11 to press against the first and second sealing rings 331, 332. The first and second sealing rings 331, 332 are deformed by the pressure, thereby ensuring a close fit between the cover plate 11 and the first and second sealing rings 331, 332. Since the first annular boss 322 and the second annular boss 323 are annular and connected end to end, pressure can be applied to the insulating member 12 around the first pole 13 and the second pole 14, so that the force is evenly applied around the first pole 13 and the second pole 14. As a result, the compression deformation of the first sealing ring 331 and the second sealing ring 332 is basically the same, thereby avoiding the formation of gaps between the local area of ​​the sealing ring and the cover plate 11.

[0092] In addition, the first annular boss 322 and the second annular boss 323 protrude from their respective surfaces, so that their respective surfaces will not contact the insulating member 12, thereby not applying pressure to the insulating member 12. Instead, only the first annular boss 322 and the second annular boss 323 will apply pressure to the insulating member 12, so that the area between the first pole 13 and the second pole 14 will not be subject to additional pressure from the respective surfaces of the first annular boss 322 and the second annular boss 323, thereby avoiding the situation where the end cover assembly 100 as a whole is subjected to force in the middle area and is bent.

[0093] In summary, the helium detection device of the second embodiment of the present invention, by providing the first annular boss 322 and the second annular boss 323, can apply uniform force to the insulating member 12 around the first pole 13 and the second pole 14, so that each position of the cover plate 11 and the first sealing ring 331 and the second sealing ring 332 are in a close contact state, preventing helium from entering the vacuum chamber through the gap between the cover plate 11 and the sealing ring, thereby improving the accuracy of the airtightness detection of the end cover assembly 100 and avoiding the occurrence of false detection and missed detection.

[0094] refer to Figures 10 to 14 , for the convenience of further explanation, a coordinate system XYZ is established, which are respectively the first direction X, the second direction Y and the third direction Z which are perpendicular to each other. Among them, the first direction X can be the length direction of the end cover assembly 100 as a whole, and is also the length direction of the cover plate 11 and the insulating member 12. The second direction Y can be the width direction of the end cover assembly 100 as a whole, and is also the width direction of the cover plate 11 and the insulating member 12. The third direction Z can be the thickness direction of the end cover assembly 100 as a whole, and is also the thickness direction of the cover plate 11 and the insulating member 12. Of course, the first direction X, the second direction Y and the third direction Z can also be other directions without limitation. Among them, the aforementioned first pressing plate 31 and the second pressing plate 32 move in the third direction Z to press the end cover assembly 100 in the thickness direction of the end cover assembly 100.

[0095] In one embodiment, reference Figures 10 to 13 The first pole 13, the explosion-proof valve 15 and the second pole 14 of the end cover assembly 100 are arranged in sequence in the first direction X.

[0096] The first pressing plate 31 further has a third air pumping cavity 313, which is located between the first air pumping cavity 311 and the second air pumping cavity 312, and the air pumping channel 301 is connected to the third air pumping cavity 313. Figure 11 The air pumping channel 301 may be provided with an air pumping sub-channel connected to the third air pumping cavity 313 , so that air can be pumped from the third air pumping cavity 313 .

[0097] The helium detection device also includes a third sealing ring 333 , which is disposed on the first pressure plate 31 and located between the first sealing ring 331 and the second sealing ring 332 . The third sealing ring 333 protrudes from a surface of the first pressure plate 31 defining a third air extraction chamber 313 , and the third sealing ring 333 surrounds the third air extraction chamber 313 .

[0098] The second pressing plate 32 further has a third air inlet cavity 3213, which is located between the first air inlet cavity 3211 and the second air inlet cavity 3212, and the air inlet channel 302 is connected to the third air inlet cavity 3213. Figure 11 The air inlet channel 302 may be provided with an air inlet sub-channel connected to the third air inlet cavity 3213 , so as to input helium into the third air inlet cavity 3213 .

[0099] The second pressure plate 32 further includes a first boss 324 and a second boss 325 spaced apart from each other. The first annular boss 322, the first boss 324, the second boss 325, and the second annular boss 323 are sequentially arranged along the first direction X. The first boss 324 and the second boss 325 are respectively located on either side of the third air inlet cavity 3213 in the first direction X.

[0100] The third air extraction chamber 313 opposes the third air inlet chamber 3213, and the third sealing ring 333 opposes the first boss 324 and the second boss 325. The first boss 324, the second boss 325, and the third sealing ring 333 are used to compress the end cap assembly 100. The third air extraction chamber 313 and the third air inlet chamber 3213 are used to accommodate the explosion-proof valve 15. The explosion-proof valve 15 may or may not protrude from the cover plate 11. In short, the explosion-proof valve 15 is located within the space of the third air extraction chamber 313, while the explosion-proof sink 125 is housed within the third air inlet chamber 3213. Helium in the third air inlet chamber 3213 enters the explosion-proof valve 15 through the explosion-proof sink 125.

[0101] Similar to the aforementioned first annular boss 322 and second annular boss 323, the first boss 324 and second boss 325 also each protrude from their respective surfaces and are configured to contact the insulating member 12, while their respective surfaces do not contact the insulating member 12. The first boss 324 and second boss 325 can be positioned near the opening of the third air inlet chamber 3213. The first boss 324 and second boss 325 press against the insulating member 12 at positions on both sides of the explosion-proof valve 15 in the first direction X, causing the cover plate 11 at these positions to press against the third sealing ring 333. This ensures that the third sealing ring 333 is subjected to substantially uniform pressure, preventing gaps between the cover plate 11 and the third sealing ring 333 in localized areas from allowing helium to enter the third air extraction chamber 313, leading to false detection or missed detection. If there is a gap between the cover plate 11 and the explosion-proof valve 15 , the helium in the third air inlet cavity 3213 will enter the third air extraction cavity 313 through the gap and be detected, thereby determining that the airtightness of the end cover assembly 100 is poor.

[0102] Therefore, the provision of the first boss 324 and the second boss 325 further improves the accuracy of the airtightness detection of the end cover assembly 100.

[0103] In one embodiment, reference Figure 10 、 Figure 12 and Figure 13 The shapes of the first air extraction cavity 311, the second air extraction cavity 312, the third air extraction cavity 313, the first air inlet cavity 3211, the second air inlet cavity 3212, and the third air inlet cavity 3213 are adapted to the corresponding first pole 13, second pole 14, and explosion-proof valve 15 of the end cover assembly 100. The shapes of the first sealing ring 331, the second sealing ring 332, and the third sealing ring 333 are adapted to the corresponding first air extraction cavity 311, the second air extraction cavity 312, and the third air extraction cavity 313.

[0104] The orthographic projection shapes of the first pole 13, the second pole 14 and the explosion-proof valve 15 on the surface of the cover plate 11 facing away from the insulating part 12 can be roughly polygonal, circular, elliptical, etc., and the orthographic projection shapes of the corresponding first air pumping cavity 311, the second air pumping cavity 312, the third air pumping cavity 313, the first air inlet cavity 3211, the second air inlet cavity 3212 and the third air inlet cavity 3213 on the surface of the cover plate 11 facing away from the insulating part 12 can also be corresponding polygonal, circular, elliptical, etc., and the orthographic projection shapes of the first sealing ring 331, the second sealing ring 332 and the third sealing ring 333 on the surface of the cover plate 11 facing away from the insulating part 12 can also be corresponding polygonal, circular, elliptical, etc.

[0105] In a specific embodiment, referring to Figure 1 and Figure 2 , the orthographic projection shape of the first pole 13 and the second pole 14 on the surface of the cover plate 11 facing away from the insulating part 12 can be roughly rectangular, and the orthographic projection shape of the explosion-proof valve 15 on the surface of the cover plate 11 facing away from the insulating part 12 is roughly elliptical. The orthographic projection shape of the outline of the corresponding first air extraction cavity 311, the second air extraction cavity 312, the first air inlet cavity 3211 and the second air inlet cavity 3212 on the surface of the cover plate 11 facing away from the insulating part 12 is also rectangular, and the orthographic projection shape of the outline of the third air extraction cavity 313 on the surface of the cover plate 11 facing away from the insulating part 12 is elliptical. The explosion-proof sink 125 extends from one end to the other end in the width direction of the cover plate 11, and the orthographic projection shape of the outline of the third air inlet cavity 3213 on the surface of the cover plate 11 facing away from the insulating part 12 is rectangular to match the explosion-proof sink 125. Among them, the width direction of the cover plate 11 can be perpendicular to the first direction X, or it can have a certain angle, without limitation.

[0106] refer to Figure 5In the first embodiment, the pressure plate 1 21 is designed using a male mold. The shapes of the first, second, and third pumping chambers 212, 213, and 214 do not conform to the first and second poles 13, 14, and explosion-proof valve 15. In particular, the generally rectangular shape of the third pumping chamber 214 does not fit well with the roughly elliptical shape of the explosion-proof valve 15. This results in the third pumping chamber 214 needing to be larger to fully accommodate the explosion-proof valve 15. Consequently, the third pumping chamber 214 needs to be larger in size, which in turn requires the third seal ring 25 to be correspondingly larger. This increases the risk of a gap between the cover plate 11 and the third seal ring 25, necessitating a higher sealing requirement. In the first embodiment, to prevent gaps from forming between seal ring 1 23, seal ring 2, and seal ring 3 25 and the cover plate 11, a secondary seal ring 27 is provided for secondary sealing. However, due to uneven force applied to the entire end cap assembly 100, the middle portion may bend downward, which can also cause gaps to form between the secondary seal ring 27 and the cover plate 11. This in turn allows helium to enter the spaces between the secondary seal ring 27 and seal ring 1 23, seal ring 24, and seal ring 3 25 through the gaps between the cover plate 11 and the secondary seal ring 27. After multiple helium tests on the end cap assembly 100, the helium trapped in the spaces between the secondary seal ring 27 and seal rings 1 23, seal ring 24, and seal ring 3 25 may also affect the accuracy of the airtightness test of the end cap assembly 100.

[0107] In the second embodiment, by providing cavities and sealing rings adapted to the shapes of the first pole 13, the second pole 14 and the explosion-proof valve 15, and by uniquely designed first annular boss 322, second annular boss 323, first boss 324 and second boss 325, there is no need to additionally provide a secondary sealing ring 27, that is, the second embodiment eliminates the secondary sealing ring 27 compared to the first embodiment, thereby completely solving the problem of inaccurate airtightness detection caused by helium hidden in the space between the secondary sealing ring 27 and the sealing ring 1 23, the sealing ring 24 and the sealing ring 3 25.

[0108] In one embodiment, reference Figure 10 、 Figure 13 and Figure 14 The first annular boss 322 and the second annular boss 323 are both formed by connecting multiple sections in sequence, and the width of each section is 2mm-5mm. The width of the first boss 324 and the second boss 325 are both 3mm-10mm.

[0109] Each segment of the first annular boss 322 and the second annular boss 323 extends generally along a straight line or curve, with the length of the segment extending in the direction of the segment and the width perpendicular to the length being the width. The width of each segment refers to the dimension of the segment in the width direction. For example, the first annular boss 322 is composed of four segments connected in sequence and has an overall rectangular shape. Each segment extends in a straight line. If two opposing segments extend along the length of the end cap assembly 100, the width of these two segments is the width of the end cap assembly 100. If two other opposing segments extend along the width of the end cap assembly 100, the width of these two segments is the length of the end cap assembly 100.

[0110] Among them, the length direction of the first boss 324 and the second boss 325 is roughly the width direction of the end cover assembly 100, and the width direction of the first boss 324 and the second boss 325 is roughly the length direction of the end cover assembly 100, and the width of the first boss 324 and the second boss 325 refers to the size in their respective width directions.

[0111] In combination with the above description, the insulating member 12 includes a first substrate 121, a second substrate 122, a first sink 123, a second sink 124, an explosion-proof sink 125 and other structures. The structure of the insulating member 12 of the second embodiment of the present invention is basically the same. Among them, the first annular boss 322, the second annular boss 323, the first boss 324 and the second boss 325 of the second embodiment are all pressed against the corresponding first substrate 121 and the second substrate 122, and the first substrate 121 and the second substrate 122 are both roughly thin plate structures, and their material is plastic. If the width of the first annular boss 322, the second annular boss 323, the first boss 324 and the second boss 325 is small, it is easy to deform the first substrate 121 and the second substrate 122 and form pits, resulting in structural damage. In addition, affected by the structure of the insulating member 12, the width of the first annular boss 322, the second annular boss 323, the first boss 324 and the second boss 325 cannot be too large to avoid interference with other structures.

[0112] Specifically, the width of the first annular boss 322 is W1, and the range of W1 is 2mm-5mm. Within this range, the first substrate 121 will not be deformed by pressure, nor will it interfere with other structures. If W1 is less than 2mm, the first substrate 121 may be pressed into a dent, resulting in structural damage. If W1 is greater than 5mm, it may interfere with other structures. The width of the second annular boss 323 is W2, and the range of W2 is 2mm-5mm. Within this range, the second substrate 122 will not be deformed by pressure, nor will it interfere with other structures. If W2 is less than 2mm, the second substrate 122 may be pressed into a dent, resulting in structural damage. If W2 is greater than 5mm, it may interfere with other structures. The width of the first boss 324 is W3, and the range of W3 is 3mm-10mm. Within this range, the first substrate 121 will not be deformed by pressure, nor will it interfere with other structures. Compared to the location of the first annular boss 322, the space on the first substrate 121 near the first boss 324 is sufficiently large, allowing the first boss 324 to have a greater width than the first annular boss 322. Specifically, the minimum value W3 can be increased from 2 mm (W1) of the first annular boss 322 to 3 mm. This allows the force to be applied to a larger area of ​​the first substrate 121, preventing it from being dented. Similarly, the maximum value W2 can also be greater than the maximum value W1. The width W4 of the second boss 325 is similar to that of W3 and will not be further described.

[0113] The specific values ​​of W1 and W2 can be 2mm, 2.2mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.5mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.5mm, 4.6mm, 4.8mm, 5mm, etc., without restriction.

[0114] The specific values ​​of W3 and W4 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0115] Therefore, setting an appropriate width range for the first annular boss 322, the second annular boss 323, the first boss 324 and the second boss 325 can ensure that the insulating part 12 will not be crushed, while avoiding interference with the structure on the insulating part 12 and can stably and evenly compress the insulating part 12.

[0116] Optional, reference Figure 10 、 Figure 13 and Figure 14The first annular boss 322 includes a first section 3221 away from the second annular boss 323 , and the second annular boss 323 includes a second section 3231 away from the first annular boss 322 . The width of each of the first section 3221 and the second section 3231 is 2 mm to 3 mm.

[0117] The first annular boss 322 and the second annular boss 323 are both roughly rectangular structures, each including four segments extending along a straight line, two of which extend along the length direction of the cover plate 11 (i.e., the first direction X), and the other two extend along the width direction of the cover plate 11 (i.e., the second direction Y). The first segment 3221 and the second segment 3231 both extend along the width direction of the cover plate 11. Since the distance between the first pole 13 and the first sink 123, and the distance between the second pole 14 and the second sink 124 are very small, the first segment 3221 will be pressed between the first pole 13 and the first sink 123, and the second segment 3231 will be pressed between the second pole 14 and the second sink 124. In order to avoid interference with the first sink 123 and the second sink 124, the width dimensions of the first segment 3221 and the second segment 3231 need to be smaller. Specifically, the width W11 of the first segment 3221 is 2mm-3mm, and the width W21 of the second segment 3231 is 2mm-3mm.

[0118] Therefore, the width of the first section 3221 and the second section 3231 is set to 2mm-3mm, which can adapt to the narrow gap between the first pole 13 and the first sink 123, and the second pole 14 and the second sink 124. While being able to compress the insulating part 12, the width is not too small to avoid damaging the insulating part 12.

[0119] Please refer to Figure 10 and Figure 13 The protrusion heights of the first annular boss 322 , the second annular boss 323 , the first boss 324 and the second boss 325 relative to their respective surfaces are not less than 0.2 mm.

[0120] It should be understood that the protrusion height here refers to the height of the protrusion relative to the respective surfaces. If the protrusion height is too small, the respective surfaces may contact the insulating part 12 and cause pressure on the insulating part 12, which may cause a situation similar to the first embodiment mentioned above in which boss 1 221 and boss 2 222 press on the insulating part 12, which may cause the overall force of the insulating part 12 to bend the end cover assembly 100 in the middle.

[0121] Therefore, the raised height of the first annular boss 322, the second annular boss 323, the first boss 324 and the second boss 325 is set to be not less than 0.2 mm, so that the surfaces on which they are located will not press onto the insulating part 12, ensuring that only the first annular boss 322, the second annular boss 323, the first boss 324 and the second boss 325 are pressed on the insulating part 12, thereby ensuring that the first sealing ring 331, the second sealing ring 332 and the third sealing ring 333 are subjected to uniform force, avoiding the generation of local gaps between them and the cover plate 11.

[0122] The raised heights of the first annular boss 322, the second annular boss 323, the first boss 324, and the second boss 325 relative to their respective surfaces can be 0.2 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, etc., without limitation. Since the surfaces of the first substrate 121 and the second substrate 122 facing away from the cover plate 11 are substantially coplanar, and the surfaces of the first annular boss 322, the second annular boss 323, the first boss 324, and the second boss 325 are also substantially coplanar, the raised heights of the first annular boss 322, the second annular boss 323, the first boss 324, and the second boss 325 can be substantially equal to ensure that each boss simultaneously presses against the insulating member 12.

[0123] In one embodiment, reference Figure 10 A first annular groove 315 is defined near the periphery of the first air extraction chamber 311, a second annular groove 316 is defined near the periphery of the second air extraction chamber 312, and a third annular groove 317 is defined near the periphery of the third air extraction chamber 313. A first sealing ring 331 is received in the first annular groove 315, a second sealing ring 332 is received in the second annular groove 316, and a third sealing ring 333 is received in the third annular groove 317.

[0124] The first sealing ring 331 , the second sealing ring 332 and the third sealing ring 333 at least partially extend outward from the corresponding first annular groove 315 , the second annular groove 316 and the third annular groove 317 to contact the cover plate 11 .

[0125] By providing the first annular groove 315 , the second annular groove 316 and the third annular groove 317 , the first sealing ring 331 , the second sealing ring 332 and the third sealing ring 333 can be easily installed, and the structure is simple.

[0126] In one embodiment, reference Figure 9 and Figure 10The first pressure plate 31 includes a first surface 303, and the second pressure plate 32 includes a second surface 304 opposite the first surface 303. The helium detection device also includes a fourth sealing ring 334, which is disposed on the first surface 303 and surrounds the first sealing ring 331, the second sealing ring 332, and the third sealing ring 333. The first pressure plate 31 and the second pressure plate 32 are used to compress the fourth sealing ring 334.

[0127] Optionally, the first surface 303 is provided with a fourth annular groove 318, and the fourth sealing ring 334 is received in the fourth annular groove 318, so as to facilitate the installation of the fourth sealing ring 334. Alternatively, the fourth sealing ring 334 can also be provided in any other feasible manner without limitation.

[0128] The fourth sealing ring 334 is set so that after the first pressure plate 31 and the second pressure plate 32 press the fourth sealing ring 334, the first pressure plate 31, the second pressure plate 32 and the fourth sealing ring 334 enclose a closed space, which can only be connected to the outside world through the air inlet channel 302 and the air exhaust channel 301. The end cover assembly 100 can be placed in the closed space for air tightness testing, thereby ensuring that no other external air enters the space and affects the air tightness test of the end cover assembly 100, thereby ensuring the accuracy of the air tightness test.

[0129] In one embodiment, reference Figures 10 to 12 The first surface 303 defines a cavity 314, and the bottom wall of the cavity 314 defines a first air extraction cavity 311, a second air extraction cavity 312, and a third air extraction cavity 313. A first sealing ring 331, a second sealing ring 332, and a third sealing ring 333 are disposed on the bottom wall of the cavity 314, adjacent to the corresponding openings of the first air extraction cavity 311, the second air extraction cavity 312, and the third air extraction cavity 313. A fourth sealing ring 334 is disposed on the first surface 303 and surrounds the cavity 314. The cavity 314 is used to accommodate the end cap assembly 100.

[0130] Specifically, the first pressure plate 31 defines an inwardly recessed cavity 314 extending from the first surface 303. The cavity 314 can be generally rectangular in shape and include a bottom wall and surrounding sidewalls, which connect the bottom wall to the first surface 303. Both the first surface 303 and the bottom wall of the cavity 314 can be planar and parallel. The aforementioned first, second, and third annular grooves 315, 316, and 317 are all formed in the bottom wall of the cavity 314. The aforementioned fourth annular groove 318 is formed in the first surface 303.

[0131] By opening the cavity 314, the space enclosed by the first pressure plate 31, the second pressure plate 32 and the fourth sealing ring 334 includes the cavity 314 for accommodating the end cover assembly 100, so that the first pressure plate 31 and the second pressure plate 32 can be very close to each other when the end cover assembly 100 is pressed, so that the fourth sealing ring 334 can adopt conventional specifications, with a simple structure and low cost.

[0132] In other embodiments, the accommodating cavity 314 may be provided on the second pressing plate 32 , and the first air pumping cavity 311 , the second air pumping cavity 312 and the third air pumping cavity 313 may be provided directly on the first surface 303 .

[0133] In one embodiment, reference Figure 10 and Figure 12 The side wall of the cavity 314 is provided with a mounting groove 319. The mounting groove 319 can penetrate the first surface 303, that is, one end of the inner wall of the mounting groove 319 is connected to the first surface 303, and the other end can be connected to or not connected to the bottom wall of the cavity 314.

[0134] Optionally, the mounting groove 319 is opened on the long side wall of the cavity 314, which is close to the edge of one side in the width direction of the first pressure plate 31. One or more mounting grooves 319 can be opened on one long side wall, or on two opposite long side walls, without any restriction.

[0135] By providing the mounting groove 319 on the side wall of the cavity 314 , when the end cover assembly 100 is placed into or removed from the cavity 314 , the space in the mounting groove 319 can be utilized, thereby facilitating the operation.

[0136] In one embodiment, reference Figure 10 、 Figure 11 and Figure 13 The second pressing plate 32 includes a first pressing block 326 and a second pressing block 327 spaced apart along the first direction X. The first pressing block 326 and the second pressing block 327 protrude from the second surface 304. The first pressing block 326 defines a first air inlet cavity 3211 on the surface facing the first pressing plate 31, and the second pressing block 327 defines a second air inlet cavity 3212 on the surface facing the first pressing plate 31. The space between the first pressing block 326 and the second pressing block 327 forms a third air inlet cavity 3213. The first annular boss 322 and the first boss 324 are provided on the first pressing block 326, and the second annular boss 323 and the second boss 325 are provided on the second pressing block 327.

[0137] The first pressing block 326 and the second pressing block 327 are similar to the boss 1 221 and the boss 2 222 in the aforementioned first embodiment, but the difference is that the first pressing block 326 and the second pressing block 327 themselves will not contact the insulating member 12. The surfaces of the first pressing block 326 and the second pressing block 327 facing the first pressing plate 31 are both planes and both are in the same plane. The first annular boss 322 and the first boss 324 are arranged on the surface of the first pressing block 326 facing the first pressing plate 31, and the second annular boss 323 and the second boss 325 are arranged on the surface of the second pressing block 327 facing the first pressing plate 31. The first air inlet cavity 3211 is recessed inward from the surface of the first pressing block 326 facing the first pressing plate 31, the second air inlet cavity 3212 is recessed inward from the surface of the second pressing block 327 facing the first pressing plate 31, and the third air inlet cavity 3213 is recessed inward from the surface in the gap between the first pressing block 326 and the second pressing block 327.

[0138] Optionally, the edge of the first section 3221 away from the second annular boss 323 may be flush with the edge of the first pressure block 326 away from the second pressure block 327, and the edge of the second section 3231 away from the first annular boss 322 may be flush with the edge of the second pressure block 327 away from the first pressure block 326. Optionally, the edge of the first boss 324 facing the second boss 325 may be flush with the edge of the first pressure block 326 facing the second pressure block 327, and the edge of the second boss 325 facing the first boss 324 may be flush with the edge of the second pressure block 327 facing the first pressure block 326. In this way, the first annular boss 322, the second annular boss 323, the first boss 324, and the second boss 325 of as large a width as possible can be fully utilized within the limited space, so that the insulating member 12 is subjected to force over a larger area and is prevented from being crushed.

[0139] The first substrate 121 and the second substrate 122 are roughly in close contact with the cover plate 11, and the first sink 123, the second sink 124 and the explosion-proof sink 125 will protrude from the surface of the first substrate 121 and the second substrate 122 facing away from the cover plate 11. After the end cover assembly 100 is accommodated in the cavity 314 of the first pressure plate 31, the first substrate 121 and the second substrate 122 are also located in the cavity 314 and will not protrude from the cavity 314.

[0140] The first pressing block 326 corresponds to the first substrate 121 between the first sinking platform 123 and the explosion-proof sinking platform 125, the second pressing block 327 corresponds to the second substrate 122 between the second sinking platform 124 and the explosion-proof sinking platform 125, the first air inlet cavity 3211 corresponds to the first pole 13, the second air inlet cavity 3212 corresponds to the second pole 14, and the third air inlet cavity 3213 corresponds to the explosion-proof sinking platform 125.

[0141] Therefore, the first pressing block 326 and the second pressing block 327 protruding from the second surface 304 can extend into the cavity 314 so that the first annular boss 322 , the second annular boss 323 , the first boss 324 and the second boss 325 can press the first substrate 121 and the second substrate 122 .

[0142] In one embodiment, reference Figure 10 and Figure 13 The first pressing block 326 has a first channel 3281 defined on its surface facing the first pressing plate 31, and the second pressing block 327 has a second channel 3282 defined on its surface facing the first pressing plate 31. The first channel 3281 connects the first air inlet cavity 3211 with the third air inlet cavity 3213, and the second channel 3282 connects the second air inlet cavity 3212 with the third air inlet cavity 3213.

[0143] The first channel 3281 and the second channel 3282 can extend in a straight line and be located in the middle of the width direction of the second pressure plate 32. There are no restrictions on the width and depth of both channels. The first channel 3281 passes through the first annular boss 322 and the first boss 324, while the second channel 3282 passes through the second annular boss 323 and the second boss 325.

[0144] By providing the first channel 3281 and the second channel 3282 , the first air inlet cavity 3211 , the second air inlet cavity 3212 and the third air inlet cavity 3213 can be interconnected, and helium can fill each air inlet cavity as quickly as possible, thereby accelerating the helium inspection progress.

[0145] Optionally, according to the above description, the insulating part 12 is further provided with a liquid injection protrusion 126, and the liquid injection protrusion 126 can be arranged on the first substrate 121 or the second substrate 122. In the second embodiment, a first avoidance groove 3285 is further provided on the surface of the first pressure block 326 facing the first pressure plate 31, and a second avoidance groove 3286 is further provided on the surface of the second pressure block 327 facing the first pressure plate 31.

[0146] In this way, when the end cap assembly 100 is placed into the cavity 314, the end cap assembly 100 can be placed forward or rotated 180°, and the first substrate 121 can correspond to the first pressing block 326, or the second substrate 122 can correspond to the first pressing block 326. In both cases, the liquid injection protrusion 126 can be accommodated in the corresponding first avoidance groove 3285 or the second avoidance groove 3286, thereby improving the versatility of the helium detection device.

[0147] Optionally, the second pressing plate 32 is axially symmetrical with respect to the third air inlet cavity 3213 , so that the first avoidance groove 3285 and the second avoidance groove 3286 can be adapted to the size of the liquid injection protrusion 126 .

[0148] Optionally, the first channel 3281 may be in communication with the first avoidance groove 3285 , and the second channel 3282 may be in communication with the second avoidance groove 3286 .

[0149] In one embodiment, reference Figure 10 and Figure 13 The second surface 304 defines a receiving groove 329. A first pressing block 326 and a second pressing block 327 are disposed on the bottom wall of the receiving groove 329, and each of the first pressing block 326 and the second pressing block 327 is spaced apart from the sidewalls of the receiving groove 329. A first notch 3283 is defined on the surface of the first pressing block 326 facing the first pressing plate 31, and a second notch 3284 is defined on the surface of the second pressing block 327 facing the first pressing plate 31. The first notch 3283 connects the first air inlet cavity 3211 with the receiving groove 329, while the second notch 3284 connects the second air inlet cavity 3212 with the receiving groove 329. The air inlet channel 302 is also connected to the receiving groove 329.

[0150] The positions of the first notch 3283 and the second notch 3284 are not limited. The first notch 3283 passes through the first annular boss 322 , and the second notch 3284 passes through the second annular boss 323 .

[0151] By setting the first pressure block 326 and the second pressure block 327 to have a gap with the side wall of the receiving groove 329, the gap formed can accommodate structures such as the first sink 123 and the second sink 124, and the first notch 3283 and the second notch 3284 are opened, the receiving groove 329 and the air inlet cavities can be interconnected, so that the helium gas can fill each space as quickly as possible, which is conducive to speeding up the progress of helium inspection.

[0152] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" is based on the orientation or positional relationship described in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0153] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A helium detection device, characterized in that: A helium detection device for detecting the air tightness of an end cap assembly (100) of an energy storage device, comprising: A first pressing plate (31) having an air pumping channel (301), a first air pumping cavity (311), and a second air pumping cavity (312); the first air pumping cavity (311) and the second air pumping cavity (312) are arranged at intervals on the first pressing plate (31); and the air pumping channel (301) is in communication with the first air pumping cavity (311) and the second air pumping cavity (312); A first sealing ring (331) and a second sealing ring (332) are provided on the first pressing plate (31) and both protrude from the surface of the first pressing plate (31) on which the first air pumping cavity (311) and the second air pumping cavity (312) are opened. The first sealing ring (331) surrounds the first air pumping cavity (311), and the second sealing ring (332) surrounds the second air pumping cavity (312). The second pressing plate (32) is arranged opposite to the first pressing plate (31); the second pressing plate (32) has an air inlet channel (302), a first air inlet cavity (3211) and a second air inlet cavity (3212); the first air inlet cavity (3211) and the second air inlet cavity (3212) are arranged at intervals on the second pressing plate (32); the air inlet channel (302) is communicated with the first air inlet cavity (3211) and the second air inlet cavity (3212); the second pressing plate (32 ) further comprises a first annular boss (322) and a second annular boss (323), wherein the first annular boss (322) and the second annular boss (323) both protrude from the surface of the second pressure plate (32) on which the first air inlet cavity (3211) and the second air inlet cavity (3212) are formed, the first annular boss (322) being arranged around the first air inlet cavity (3211), and the second annular boss (323) being arranged around the second air inlet cavity (3212); The first pressing plate (31) and the second pressing plate (32) are used to move toward or away from each other, the first air extraction cavity (311) is opposite to the first air inlet cavity (3211), the second air extraction cavity (312) is opposite to the second air inlet cavity (3212), the first sealing ring (331) is opposite to the first annular boss (322), and the second sealing ring (332) is opposite to the second annular boss (323).

2. The helium detection device according to claim 1, characterized in that: The first pressing plate (31) further comprises a third air pumping cavity (313), the third air pumping cavity (313) being located between the first air pumping cavity (311) and the second air pumping cavity (312), and the air pumping channel (301) being in communication with the third air pumping cavity (313); The helium detection device further includes a third sealing ring (333), the third sealing ring (333) being arranged on the first pressing plate (31) and protruding from a surface of the first pressing plate (31) on which the third air extraction cavity (313) is opened, and the third sealing ring (333) is arranged around the third air extraction cavity (313); The second pressing plate (32) further has a third air inlet cavity (3213), the third air inlet cavity (3213) is located between the first air inlet cavity (3211) and the second air inlet cavity (3212), and the air inlet channel (302) is in communication with the third air inlet cavity (3213); The second pressure plate (32) further includes a first boss (324) and a second boss (325), wherein the first annular boss (322), the first boss (324), the second boss (325) and the second annular boss (323) are arranged in sequence along a first direction (X), and the first boss (324) and the second boss (325) are respectively located on both sides of the third air inlet cavity (3213) in the first direction (X); wherein the third air extraction cavity (313) is opposite to the third air inlet cavity (3213), and the third sealing ring (333) is opposite to the first boss (324) and the second boss (325).

3. The helium detection device according to claim 2, characterized in that: The first annular boss (322) and the second annular boss (323) are both formed by connecting multiple sections in sequence, and the width of each section is 2mm-5mm. The width of the first boss (324) and the second boss (325) are both 3mm-10mm.

4. The helium detection device according to claim 3, characterized in that: The first annular boss (322) includes a first section (3221) away from the second annular boss (323), and the second annular boss (323) includes a second section (3231) away from the first annular boss (322), and the width of each of the first section (3221) and the second section (3231) is 2mm-3mm.

5. The helium detection device according to claim 3, characterized in that: The protrusion heights of the first annular boss (322), the second annular boss (323), the first boss (324) and the second boss (325) relative to the surfaces on which they are located are not less than 0.2 mm.

6. The helium detection device according to claim 2, characterized in that: A first annular groove (315) is provided near the periphery of the first air pumping cavity (311), a second annular groove (316) is provided near the periphery of the second air pumping cavity (312), and a third annular groove (317) is provided near the periphery of the third air pumping cavity (313). The first sealing ring (331) is accommodated in the first annular groove (315), the second sealing ring (332) is accommodated in the second annular groove (316), and the third sealing ring (333) is accommodated in the third annular groove (317).

7. The helium detection device according to claim 2, characterized in that: The first pressure plate (31) includes a first surface (303), and the helium detection device further includes a fourth sealing ring (334). The fourth sealing ring (334) is arranged on the first surface (303), and the fourth sealing ring (334) is arranged around the first sealing ring (331), the second sealing ring (332) and the third sealing ring (333).

8. The helium detection device according to claim 7, characterized in that: The first surface (303) is provided with a cavity (314), and the bottom wall of the cavity (314) is provided with the first air pumping cavity (311), the second air pumping cavity (312) and the third air pumping cavity (313). The first sealing ring (331), the second sealing ring (332) and the third sealing ring (333) are arranged on the bottom wall of the cavity (314) and are adjacent to the openings of the corresponding first air pumping cavity (311), the second air pumping cavity (312) and the third air pumping cavity (313). The fourth sealing ring (334) is provided on the first surface (303) and surrounds the cavity (314). The cavity (314) is used to accommodate the end cover assembly (100).

9. The helium detection device according to claim 8, characterized in that: A mounting groove (319) is formed on the side wall of the cavity (314).

10. The helium detection device according to claim 8, characterized in that: The second pressing plate (32) includes a second surface (304) opposite to the first surface (303), and the second pressing plate (32) includes a first pressing block (326) and a second pressing block (327) arranged at intervals along the first direction (X). The first pressing block (326) and the second pressing block (327) protrude from the second surface (304). The first pressing block (326) is provided with the first air inlet cavity (3211) on the surface facing the first pressing plate (31), and the second pressing block (327) is provided with the second air inlet cavity (3212) on the surface facing the first pressing plate (31). The space between the first pressing block (326) and the second pressing block (327) forms the third air inlet cavity (3213). The first annular boss (322) and the first boss (324) are provided on the first pressing block (326), and the second annular boss (323) and the second boss (325) are provided on the second pressing block (327).

11. The helium detection device according to claim 10, characterized in that: The first pressing block (326) is provided with a first channel (3281) on the surface facing the first pressing plate (31), and the second pressing block (327) is provided with a second channel (3282) on the surface facing the first pressing plate (31). The first channel (3281) connects the first air inlet cavity (3211) and the third air inlet cavity (3213), and the second channel (3282) connects the second air inlet cavity (3212) and the third air inlet cavity (3213).

12. The helium detection device according to claim 10, characterized in that: The second surface (304) is provided with a receiving groove (329), the first pressing block (326) and the second pressing block (327) are arranged on the bottom wall of the receiving groove (329), and the first pressing block (326) and the second pressing block (327) are both spaced apart from the side wall of the receiving groove (329), the first pressing block (326) is provided with a first notch (3283) on the surface facing the first pressing plate (31), and the second pressing block (327) is provided with a second notch (3284) on the surface facing the first pressing plate (31), the first notch (3283) is connected to the first air inlet cavity (3211) and the receiving groove (329), the second notch (3284) is connected to the second air inlet cavity (3212) and the receiving groove (329), and the air inlet channel (302) is also connected to the receiving groove (329).

13. The helium detection device according to claim 11, characterized in that: The first pressing block (326) is provided with a first avoidance groove (3285) on the surface facing the first pressing plate (31), and the second pressing block (327) is provided with a second avoidance groove (3286) on the surface facing the second pressing plate (32).

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