Device for detecting air tightness of battery box body

Abstract

The invention discloses a battery box air tightness detection device, and relates to the technical field of battery box production detection, the battery box air tightness detection device comprises a rack main body, a detection table and an inflation detection mechanism, the detection table is used for supporting an inverted battery box, and the detection table is provided with an air inlet cooperatively connected with the inflation detection mechanism; a rubber sealing ring matched with the edge of the battery box body is arranged on the detection table, and the lifting type pressing cover is matched with the outer edge of the detection table and is used for covering the battery box body which is inversely buckled on the detection table. According to the invention, the inversely buckled battery box body is covered by the box-shaped cover body, and the space between the box-shaped cover body and the battery box body is vacuumized by the vacuum pump, so that after the battery box body is filled with gas, if the battery box body leaks, the leakage of floor gas in the battery box body can be accelerated by virtue of the vacuum state, and the detection efficiency is improved; the slow air leakage condition can be conveniently and rapidly detected, and the detection effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery box production and detection, and particularly to an airtightness detection device for a battery box. Background Art

[0002] The battery box is the outer casing of the battery assembly, and its airtightness is directly related to the safety of the battery pack. If there is a leak in the battery box, it will pose a danger, and moisture, dust or other impurities in the external environment may enter the battery, resulting in safety problems such as battery short circuit and leakage. Therefore, it is necessary to detect problems in time through airtightness detection.

[0003] Currently, when detecting the airtightness of a battery box, common methods include liquid filling detection and air filling detection. For liquid filling detection, subsequent processing of the liquid is required, and the workload is large. Therefore, air filling detection is mostly adopted. Air filling detection mainly installs the battery box on the detection table and seals the ports, and then fills the battery box with gas. When the corresponding air pressure is reached, it is detected whether the air pressure drops to determine the airtightness.

[0004] The deficiencies of the existing battery box airtightness detection are as follows: When the existing battery box is detected, although the airtightness can be judged by detecting the air pressure during air filling, the operation is simple and convenient. However, for the case of chronic air leakage of the battery box, such as when there are relatively small leakage points in the battery box and the air leakage speed is very slow, it is necessary to wait for a long time to effectively detect the change in air pressure drop, resulting in a long detection time and low detection efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide an airtightness detection device for a battery box to solve the technical problem of low detection efficiency of the existing airtightness detection device for a battery box when detecting chronic air leakage of the battery box.

[0006] The technical problem to be solved by the present invention can be achieved through the following technical solutions:

[0007] An airtightness detection device for a battery box includes a frame body, a detection table and an air filling detection mechanism. The detection table is used to support the inverted battery box. An air inlet is opened on the detection table and is connected to the air filling detection mechanism in a matching manner. A rubber sealing ring is arranged on the detection table and is matched with the edge of the battery box. The device further includes:

[0008] A lifting and pressing cover, which is matched with the outer edge of the detection table and is used to cover the inverted battery box on the detection table. The size of the lifting and pressing cover is larger than that of the battery box. A vacuum pump is arranged on the lifting and pressing cover. When the lifting and pressing cover covers the battery box, the vacuum pump is used to evacuate the space between the lifting and pressing cover and the battery box into a vacuum;

[0009] A pressing mechanism, which is arranged at the bottom of the detection table and is used to press the rubber sealing ring against the battery box body in an inverted manner.

[0010] As a further solution of the present invention: The lifting and pressing cover includes a hydraulic telescopic rod and a box-shaped cover body. The hydraulic telescopic rod is fixedly installed at the top of the frame body. The telescopic end of the hydraulic telescopic rod is fixedly connected with a mounting frame, and the telescopic end of the hydraulic telescopic rod is fixedly connected with the box-shaped cover body through the mounting frame. The vacuum pump is fixedly installed on the box-shaped cover body, and the negative pressure end of the vacuum pump communicates with the inner side of the box-shaped cover body.

[0011] As a further solution of the present invention: A circular docking groove matching with the bottom edge of the box-shaped cover body is opened on the detection table.

[0012] As a further solution of the present invention: A plurality of pressing top blocks are fixedly arranged on the inner top of the box-shaped cover body. After the box-shaped cover body descends and docks with the detection table, the pressing top blocks press on the battery box body.

[0013] As a further solution of the present invention: Communication holes are opened at positions near the edges on both sides of the detection table, and a piston mechanism connected to the pressing mechanism is arranged below each communication hole.

[0014] As a further solution of the present invention: The piston mechanism includes a piston cylinder, a piston block and a lifting cross bar. The piston cylinder is correspondingly fixedly connected to the bottom of the communication hole. The piston block is slidably connected in the piston cylinder. The piston block is fixedly connected with the lifting cross bar, and the lifting cross bar is connected to the pressing mechanism.

[0015] As a further solution of the present invention: The pressing mechanism includes a lifting frame. A circular through chute is opened on the detection table. The lifting frame is slidably inserted in the circular through chute, and the rubber sealing ring is connected to the upper side opening of the circular through chute. A limiting spring is connected between the bottom of the lifting frame and the detection table, and the lifting frame is connected to the moving end of the piston mechanism.

[0016] As a further solution of the present invention: A linkage valve matched with the moving end of the piston mechanism is arranged at the bottom of the air inlet.

[0017] As a further solution of the present invention: The linkage valve includes an air inflation square pipe and a sliding valve plate. The air inflation square pipe is fixedly connected to the bottom of the air inlet and communicates with the air inflation end of the air inflation detection mechanism. The sliding valve plate horizontally penetrates through one side of the air inflation square pipe. A linkage rod is movably connected to the side of the sliding valve plate away from the air inflation square pipe through a hinge. The moving end of the piston mechanism is fixedly connected with a connecting cross bar, and the end of the linkage rod away from the sliding valve plate is movably connected with the connecting cross bar through a hinge.

[0018] As a further solution of the present invention: The inflation detection mechanism includes an air pump and an airtightness detector. The inflation end of the air pump is communicated with an inflation square tube. A pressure sensor electrically connected to the airtightness detector is installed on the tabletop of the detection table, and an electric control valve electrically connected to the pressure sensor is also installed on the inflation square tube.

[0019] Advantages of the present invention:

[0020] 1. The present invention covers the inverted battery box body with a box-shaped cover, and evacuates the space between the box-shaped cover and the battery box body into a vacuum by a vacuum pump. In this way, when gas is filled into the battery box body, if there is a leak in the battery box body, the vacuum state can be relied on to accelerate the gas leakage inside the battery box body, thereby improving the detection efficiency, facilitating the quick detection of slow air leakage, and improving the detection effect.

[0021] 2. When the vacuum pump evacuates the box-shaped cover to a vacuum, the negative pressure generated can also act on the connected piston cylinder through the communication hole, facilitating the sliding and rising of the piston block in the piston cylinder. The piston block drives the set lifting frame to slide and rise upward, and presses against the bottom edge position of the inverted battery box body, facilitating the guarantee of the sealing effect between the battery box body and the detection table, and avoiding leakage at the docking position from affecting the airtightness detection result.

[0022] 3. When the piston block in the piston cylinder rises under the action of negative pressure, the connecting cross bar can also be raised synchronously. The connecting cross bar drives the set sliding valve plate to slide through the linkage rod, opening the inflation square tube communicated with the air inlet, facilitating inflation detection. Description of the drawings

[0023] The present invention will be further described below with reference to the drawings.

[0024] Figure 1 is the overall structural schematic diagram of the present invention;

[0025] Figure 2 is the top view structural schematic diagram of the detection table in the present invention;

[0026] Figure 3 is the bottom view structural schematic diagram of the detection table in the present invention;

[0027] Figure 4 is the left view structural schematic diagram of the connection between the lifting frame and the lifting cross bar in the present invention;

[0028] Figure 5 is the structural schematic diagram when the box-shaped cover covers the detection table in the present invention;

[0029] Figure 6 is the cross-sectional structural schematic diagram when the box-shaped cover covers the battery box body in the present invention;

[0030] Figure 7 Yes Figure 6 Schematic enlarged structure diagram at position A in

[0031] Figure 8 It is a schematic structural diagram of the cooperation and connection between the piston block and the piston cylinder in the present invention.

[0032] In the figure: 1, frame main body; 2, detection table; 3, hydraulic telescopic rod; 4, mounting frame; 5, box-shaped cover; 6, vacuum pump; 7, air inlet; 8, air inflation pump; 9, airtightness detector; 10, air pressure sensor; 11, rubber sealing ring; 12, annular docking groove; 13, communication hole; 14, lifting frame; 15, piston cylinder; 16, lifting cross bar; 17, safety valve; 18, connecting cross bar; 19, linkage rod; 20, sliding valve plate; 21, air inflation square tube; 22, electric control valve; 23, limit spring; 24, piston block; 25, chute; 26, battery box body; 27, top block. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0034] As Figures 1-8 shown, the airtightness detection device for the battery box body includes a frame main body 1, a detection table 2 and an air inflation detection mechanism. The detection table 2 is horizontally and fixedly installed in the middle part of the frame main body 1. The detection table 2 is used to support the inverted battery box body 26. An air inlet 7 is provided on the detection table 2 and is cooperatively connected with the air inflation detection mechanism. After the battery box body 26 is inverted on the detection table 2, gas is conveyed through the air inflation detection mechanism and introduced into the closed cavity formed between the battery box body 26 and the detection table 2 through the air inlet 7. Then, it is detected whether the air pressure in the cavity changes, so as to judge whether the airtightness of the battery box body 26 is qualified; a rubber sealing ring 11 is arranged on the detection table 2 and is matched with the edge of the battery box body 26. After the battery box body 26 is inverted on the detection table 2, the edge of the battery box body 26 is pressed on the rubber sealing ring 11, so as to facilitate the sealing of the contact position between the battery box body 26 and the detection table 2. Here, it should be noted that in order to facilitate the contact between the edge of the battery box body 26 and the rubber sealing ring 11 on the detection table 2, the difference in width between the inner and outer circles of the rubber sealing ring 11 can be made greater than the edge thickness of the battery box body 26.

[0035] The detection device further includes a lifting and pressing cover and a top pressing mechanism. The lifting and pressing cover cooperates with the outer edge of the detection table 2 and is used to cover the battery box body 26 inverted on the detection table 2. The size of the lifting and pressing cover is larger than that of the battery box body 26. In this way, after the lifting and pressing cover covers the battery box body 26, a space can be formed between the two; a vacuum pump 6 is provided on the lifting and pressing cover. When the lifting and pressing cover covers the battery box body 26, the vacuum pump 6 is used to evacuate the space between the lifting and pressing cover and the battery box body 26 into a vacuum. In this way, when gas is filled into the battery box body 26, if there is a leakage position, the vacuum environment is convenient for accelerating gas leakage, so as to improve the detection efficiency and avoid slow leakage that cannot be quickly feedback.

[0036] The top pressing mechanism is arranged at the bottom of the detection table 2. The top pressing mechanism can slide up and down relative to the detection table 2 and is used to press the rubber sealing ring 11 against the inverted battery box body 26, so as to make the rubber sealing ring 11 closely adhere to the edge position of the battery box body 26, thereby ensuring the sealing performance of the butt joint position and avoiding affecting the detection result.

[0037] In some specific implementation schemes, such as Figure 1 As shown, the lifting and pressing cover includes a hydraulic telescopic rod 3 and a box-shaped cover body 5. There are multiple hydraulic telescopic rods 3, which are fixedly installed on the top of the frame body 1, and the telescopic ends of the hydraulic telescopic rods 3 face down. The telescopic ends of the hydraulic telescopic rods 3 are fixedly connected with a mounting frame 4, and the telescopic ends of the hydraulic telescopic rods 3 are fixedly connected with the box-shaped cover body 5 through the mounting frame 4. And the downward side of the box-shaped cover body 5 is open. The size of the box-shaped cover body 5 is larger than that of the battery box body 26. The vacuum pump 6 is fixedly installed on the box-shaped cover body 5, and the negative pressure end of the vacuum pump 6 is communicated with the inside of the box-shaped cover body 5 through a pipe body. After the battery box body 26 is inverted on the detection table 2, the hydraulic telescopic rod 3 is started to extend, so as to drive the box-shaped cover body 5 to descend onto the detection table 2 and cover the inverted battery box body 26 in a closed space, and then rely on the vacuum pump 6 to evacuate the space between the box-shaped cover body 5 and the battery box body 26 into a vacuum state.

[0038] In addition, a ring-shaped docking groove 12 matching the bottom edge of the box-shaped cover body 5 is opened on the detection table 2. A sealing ring can be placed in the ring-shaped docking groove 12. When the box-shaped cover body 5 descends onto the detection table 2, the bottom edge of the box-shaped cover body 5 is embedded in the ring-shaped docking groove 12, which is convenient for forming a sealed space between the box-shaped cover body 5 and the detection table 2 and facilitating vacuum pumping.

[0039] Moreover, a plurality of pressing top blocks 27 are fixedly arranged on the inner top of the box-shaped cover body 5. After the box-shaped cover body 5 descends and docks on the detection table 2, the pressing top blocks 27 press on the battery box body 26, which is convenient for fixing and pressing it tightly.

[0040] In some specific implementation schemes, combined with Figure 2 、Figure 3 and Figure 8 As shown in Figure 8 , communication holes 13 are provided at positions near the edges on both sides of the detection table 2. When the box-shaped cover 5 descends and docks onto the detection table 2, the space between the box-shaped cover 5 and the battery box body 26 is in communication with the communication holes 13, and a piston mechanism connected to the pressing mechanism is provided below each communication hole 13.

[0041] Among them, the piston mechanism includes a piston cylinder 15, a piston block 24, and a lifting cross bar 16. The piston cylinder 15 is fixedly connected to the bottom of the communication hole 13 correspondingly, and the two are in communication with each other. The piston block 24 is slidably connected inside the piston cylinder 15. It should be noted that both the upper and lower ends of the piston cylinder 15 are open. A extension rod extending to the outside of the piston cylinder 15 is fixedly connected to the bottom of the piston block 24, and the piston block 24 is fixedly connected to the lifting cross bar 16 through the extension rod. The lifting cross bar 16 is connected to the pressing mechanism.

[0042] After the box-shaped cover 5 descends and docks onto the detection table 2, since the space between the box-shaped cover 5 and the battery box body 26 is in communication with the distributed communication holes 13, when the vacuum pump 6 evacuates, the piston cylinder 15 communicated with the communication holes 13 can also be sucked. At this time, the air pressure in the space of the piston cylinder 15 above the piston block 24 gradually becomes less than the air pressure in the lower space, and then the piston block 24 rises along the piston cylinder 15 under the action of negative pressure. The rising piston block 24 drives the pressing mechanism to rise through the lifting cross bar 16, facilitating the pressing of the rubber sealing ring 11 at the bottom edge position of the battery box body 26, strengthening the sealing performance of the docking position, and there is no need to apply pressure separately for operation, improving the operation convenience.

[0043] In some specific implementation schemes, as shown in Figure 3 , Figure 4 , Figure 6 , and Figure 7 , the pressing mechanism includes a lifting frame 14. An annular through chute 25 is provided on the detection table 2. The lifting frame 14 is slidably inserted into the annular through chute 25, and the rubber sealing ring 11 is connected to the upper side opening of the annular through chute 25. A compressible limit spring 23 is connected between the bottom of the lifting frame 14 and the detection table 2, and the lifting frame 14 is connected to the moving end of the piston mechanism. Specifically, the lifting frame 14 can be fixedly connected to the lifting cross bar 16 of the piston mechanism through a bracket.

[0044] In this way, when the piston block 24 of the piston mechanism rises under the action of negative pressure, it drives the lifting frame 14 to rise through the lifting cross bar 16. The lifting frame 14 slides and rises along the annular through chute 25, thereby pushing up the rubber sealing ring 11, facilitating the pressing of the rubber sealing ring 11 at the bottom edge position of the battery box body 26.

[0045] ​​​​​​​​It should be noted that since the annular through chute 25 is provided, the middle part of the test bench 2 needs to be supported separately. Therefore, the legs near the middle at the bottom of the frame body 1 can be fixedly connected to the middle part of the test bench 2, and the legs on both sides are fixedly connected to the outer part of the test bench 2.

[0046] In some specific embodiments, a linkage valve is provided at the bottom of the air inlet 7 and is cooperatively connected to the moving end of the piston mechanism. After the piston mechanism rises under the negative pressure of the vacuum pump 6, the linkage valve is in an open state.

[0047] Among them, as Figure 6 shown, the linkage valve includes an air inflation square tube 21 and a sliding valve plate 20. The air inflation square tube 21 is fixedly connected to the bottom of the air inlet 7, and the two are in a communicating state. Moreover, the air inflation square tube 21 is communicated with the air inflation end of the air inflation detection mechanism. The sliding valve plate 20 horizontally penetrates one side of the air inflation square tube 21, and the width of the sliding valve plate 20 matches the internal width of the air inflation square tube 21. The sliding valve plate 20 can completely enclose and cut off the space above the air inflation square tube 21. A linkage rod 19 is movably connected to the side of the sliding valve plate 20 away from the air inflation square tube 21 through a hinge. The moving end of the piston mechanism is fixedly connected to a connecting cross bar 18. Specifically, the connecting cross bar 18 can be fixedly connected to the lifting cross bar 16 in the piston mechanism. The end of the linkage rod 19 away from the sliding valve plate 20 is movably connected to the connecting cross bar 18 through a hinge, and the linkage rod 19 is in an inclined state.

[0048] When the vacuum pump 6 starts to evacuate the space between the box-shaped cover 5 and the battery box body 26, since the sliding valve plate 20 closes the air inlet 7 above the air inflation square tube 21, even if there is a leak in the battery box body 26 at this time, the influence on vacuum pumping can be reduced. When the vacuum pumping reaches a certain degree, the piston block 24 of the piston mechanism rises by relying on the negative pressure. The piston block 24 drives the connecting cross bar 18 to rise through the lifting cross bar 16. During the rising process of the connecting cross bar 18, the sliding valve plate 20 is pushed by the linkage rod 19, so as to drive the sliding valve plate 20 to be pulled out of the air inflation square tube 21 by a part, realizing the opening of the air inflation square tube 21. Then, the air inflation detection mechanism is started for inflation, so as to facilitate inflation into the battery box body 26 through the air inflation square tube 21 and the air inlet 7.

[0049] It should be noted that in order to facilitate automatic inflation, a travel switch can be set in the opening movement direction of the sliding valve plate 20. When the sliding valve plate 20 slides horizontally and opens and slides to the position where the travel switch is located, the travel switch starts the air inflation detection mechanism to perform inflation automatically.

[0050] In some specific embodiments, such as Figure 1As shown in the figure, the inflation detection mechanism includes an air inflation pump 8 and an airtightness detector 9. The inflation end of the air inflation pump 8 is communicated with the inflation square pipe 21. A pressure sensor 10 electrically connected to the airtightness detector 9 is installed on the tabletop of the detection table 2, and an electric control valve 22 electrically connected to the pressure sensor 10 is also installed on the inflation square pipe 21.

[0051] Before inflation, the electric control valve 22 is in an open state. When the air inflation pump 8 inflates the inside of the battery box body 26 inverted on the detection table 2 through the inflation square pipe 21, the pressure sensor 10 detects the air pressure inside the battery box body 26. When the air pressure reaches the set value, the data is collected and judged by a supporting controller, and then the electric control valve 22 is controlled to close based on the result that the air pressure value reaches the set value.

[0052] In addition, it should be noted that an electric control knife switch is connected in series in the circuit between the travel switch and the air inflation pump 8. When the pressure sensor 10 detects that the air pressure in the battery box body 26 reaches the set value, the supporting controller controls the electric control knife switch to disconnect, so that the air inflation pump 8 stops operating in time, and pressure is maintained in the closed state of the electric control valve 22. Then, the pressure sensor 10 continuously monitors whether the air pressure in the battery box body 26 drops.

[0053] In addition, a safety valve 17 is installed at the bottom of the detection table 2. When the air pressure in the battery box body 26 is too high, it can be depressurized through the safety valve 17 to avoid danger.

[0054] For the convenience of those skilled in the art to understand the embodiments of this solution, the working principle of this solution will be briefly described below in combination with a specific application scenario:

[0055] First, invert the battery box body 26 on the detection table 2, and press the edge of the battery box body 26 on the rubber sealing ring 11, so as to facilitate the sealing of the contact position between the battery box body 26 and the detection table 2.

[0056] Then, drive the box-shaped cover body 5 to descend onto the detection table 2 through the hydraulic telescopic rod 3, and cover the inverted battery box body 26 in a closed space. Then, rely on the vacuum pump 6 to evacuate the space between the box-shaped cover body 5 and the battery box body 26 into a vacuum state.

[0057] After the vacuum pump 6 evacuates the space between the box-shaped cover body 5 and the battery box body 26 to a certain extent, the piston block 24 in the piston cylinder 15 communicated with the communication hole 13 rises along the piston cylinder 15 under the action of negative pressure. The rising piston block 24 drives the lifting frame 14 to rise through the lifting cross bar 16, and the lifting frame 14 slides and rises along the annular through chute 25, so as to push up the rubber sealing ring 11, which is convenient to press the rubber sealing ring 11 against the bottom edge position of the battery box body 26, strengthen the sealing performance of the docking position between the edge of the reversely buckled battery box body 26 and the detection table 2, avoid affecting the detection result, and there is no need to apply pressure separately for operation, thus improving the operation convenience.

[0058] And when the piston block 24 rises due to the action of negative pressure, the piston block 24 drives the connecting cross bar 18 to rise through the lifting cross bar 16. During the rising process of the connecting cross bar 18, the sliding valve plate 20 is pushed by the linkage rod 19, so as to drive the sliding valve plate 20 to be pulled out of the air inlet square pipe 21 by a part, realizing the opening of the air inlet square pipe 21. Then, it is inflated by the air inflation pump 8, and the air pressure sensor 10 is relied on to detect whether the set air pressure value is reached in the battery box body 26. After the set air pressure value is reached, the electric control valve 22 on the air inlet square pipe 21 is closed to keep the pressure. Then, the air pressure sensor 10 is relied on to continuously monitor whether the air pressure in the battery box body 26 drops. If there is a leak in the battery box body 26, since the space between the box-shaped cover body 5 and the battery box body 26 is in a vacuum state, the gas in the battery box body 26 can be quickly lost under the action of the air pressure difference, accelerating the air pressure drop. In this way, the detection time can be shortened, the detection efficiency can be improved, and the slow air leakage can be avoided from being detected quickly.

[0059] The above has described several embodiments of the present invention in detail, but the embodiments of the present invention are not limited thereto and cannot be considered as used to limit the implementation scope of the present invention. All equal changes and improvements made according to the scope of the present invention application shall still fall within the scope covered by the patent of the present invention.

Claims

1. A battery box air tightness detection device, comprising a frame body (1), a detection platform (2) and an inflation detection mechanism, wherein the detection platform (2) is used to support an inverted battery box (26), an air inlet (7) is provided on the detection platform (2) and is connected to the inflation detection mechanism, and a rubber sealing ring (11) is provided on the detection platform (2) and is matched with the edge of the battery box (26), characterized in that: Also includes: A lifting and lowering cover, the lifting and lowering cover cooperates with the outer edge of the testing platform (2) and is used to cover a battery box (26) that is inverted on the testing platform (2); the size of the lifting and lowering cover is larger than the size of the battery box (26); a vacuum pump (6) is provided on the lifting and lowering cover; when the lifting and lowering cover covers the battery box (26), the vacuum pump (6) is used to evacuate the space between the lifting and lowering cover and the battery box (26); A pressing mechanism is arranged at the bottom of the testing platform (2), and is used to press the rubber sealing ring (11) toward the inverted battery box (26).

2. The battery box airtightness detection device according to claim 1, characterized in that: The lifting downward pressure cover comprises a hydraulic telescopic rod (3) and a box-shaped cover body (5); the hydraulic telescopic rod (3) is fixedly mounted on the top of the frame body (1); the telescopic end of the hydraulic telescopic rod (3) is fixedly connected to a mounting frame (4); and the telescopic end of the hydraulic telescopic rod (3) is fixedly connected to the box-shaped cover body (5) via the mounting frame (4); the vacuum pump (6) is fixedly mounted on the box-shaped cover body (5), and the negative pressure end of the vacuum pump (6) is connected to the inner side of the box-shaped cover body (5).

3. The battery box airtightness detection device according to claim 2, characterized in that: The detection platform (2) is provided with an annular docking groove (12) which matches the bottom edge of the box-shaped cover body (5).

4. The battery box airtightness detection device according to claim 2, characterized in that: A plurality of pressing top blocks (27) are fixedly arranged on the inner top of the box-shaped cover body (5); after the box-shaped cover body (5) is lowered and docked onto the testing platform (2), the pressing top blocks (27) are pressed onto the battery box body (26).

5. The battery box airtightness detection device according to claim 1, characterized in that: Both sides of the detection platform (2) are provided with communication holes (13) near the edges, and a piston mechanism connected to the pressing mechanism is provided below each communication hole (13).

6. The battery box airtightness detection device according to claim 5, characterized in that: The piston mechanism comprises a piston cylinder (15), a piston block (24) and a lifting cross rod (16); the piston cylinder (15) is fixedly connected to the bottom of the connecting hole (13); the piston block (24) is slidably connected in the piston cylinder (15); the piston block (24) is fixedly connected to the lifting cross rod (16); and the lifting cross rod (16) is connected to the top pressing mechanism.

7. The battery box airtightness detection device according to claim 1, characterized in that: The pressing mechanism comprises a lifting frame (14), an annular through-groove (25) is provided on the detection platform (2), the lifting frame (14) slides and penetrates in the annular through-groove (25), and the rubber sealing ring (11) is connected to the upper opening of the annular through-groove (25), a limit spring (23) is connected between the bottom of the lifting frame (14) and the detection platform (2), and the lifting frame (14) is connected to the moving end of the piston mechanism.

8. The battery box airtightness detection device according to claim 1, characterized in that: A linkage valve is provided at the bottom of the air inlet (7) and is cooperatively connected to the moving end of the piston mechanism.

9. The battery box airtightness detection device according to claim 8, characterized in that: The linkage valve comprises an inflatable square tube (21) and a sliding valve plate (20); the inflatable square tube (21) is fixedly connected to the bottom of the air inlet (7), and the inflatable square tube (21) is connected to the inflatable end of the inflatable detection mechanism; the sliding valve plate (20) transversely penetrates one side of the inflatable square tube (21); the side of the sliding valve plate (20) away from the inflatable square tube (21) is movably connected to a linkage rod (19) via a hinge; the moving end of the piston mechanism is fixedly connected to a connecting cross bar (18); the end of the linkage rod (19) away from the sliding valve plate (20) is movably connected to the connecting cross bar (18) via a hinge.

10. The battery box airtightness detection device according to claim 9, characterized in that: The inflation detection mechanism comprises an inflation pump (8) and an air tightness detector (9); the inflation end of the inflation pump (8) is connected to an inflation square tube (21); an air pressure sensor (10) electrically connected to the air tightness detector (9) is installed on the surface of the detection table (2); and an electric control valve (22) electrically connected to the air pressure sensor (10) is also installed on the inflation square tube (21).

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