A device for testing the air tightness of batteries in new energy vehicles

Abstract

This utility model discloses a device for testing the air tightness of new energy vehicle batteries, comprising a feeding conveyor belt, a testing platform, and a discharging conveyor belt. A testing seat is mounted on the testing platform, flush with the conveying surfaces of the feeding and discharging conveyors. A support frame is mounted on one side of the testing platform, and a testing cover is mounted on the support frame via a hydraulic cylinder. When pressed downwards, the testing cover can seal against the testing seat. A ventilation component and a pressure gauge are mounted on the testing cover. A fixed column is movably mounted on one side of the testing platform along the conveying direction, and a supporting beam is mounted on the fixed column. A mounting frame is retractably mounted on the inner side of the supporting beam, and clamping frames are symmetrically mounted on the mounting frame. Each clamping frame is equipped with a battery clamping component. This utility model can improve the operational efficiency of air tightness testing of new energy vehicle batteries and reduce wear on the bottom of the batteries during the testing process.

Description

Technical Field

[0001] This utility model relates to the field of battery airtightness testing technology, and more specifically, it relates to a battery airtightness testing device for new energy vehicles. Background Technology

[0002] To ensure safety and reliability, new energy vehicle batteries require airtightness testing. Poor battery sealing can allow moisture, oxygen, or dust to enter, leading to electrolyte decomposition, electrode corrosion, and even thermal runaway, posing a risk of fire or explosion. Furthermore, poor airtightness can negatively impact battery performance and shorten its lifespan.

[0003] Chinese patent document with publication number CN220206986U discloses a device for testing the airtightness of new energy vehicle batteries. The device reduces manual intervention in the testing process of new energy batteries and improves testing efficiency by using a continuous conveying method.

[0004] However, the above solution mainly achieves the transfer process of new energy vehicle battery loading-inspection-unloading by pushing the battery to move. During this process, the bottom of the battery box will have sliding friction with the bottom surface, causing damage to the bottom of the battery box.

[0005] In addition, during the operation of the above scheme, the batteries that have been tested in the previous batch need to be pushed onto the second conveyor belt for unloading to realize the loading. However, in the process of the first hydraulic rod 302 driving the first push plate 303 to extend and retract, the testing and loading cannot be realized, and the synchronous and continuous operation of unloading and loading cannot be achieved, which affects the testing efficiency. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To address the problems existing in the prior art, this utility model provides a new energy vehicle battery airtightness testing device to solve the technical problems mentioned in the background art, such as the easy occurrence of bottom friction during the transfer process of battery testing in the prior art, and the poor time utilization during loading and unloading, which affects the testing efficiency.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A new energy vehicle battery airtightness testing device includes, in sequence, a feeding conveyor belt, a testing platform, and a discharging conveyor belt. A testing seat is mounted on the testing platform, and the testing seat is flush with the conveying surfaces of the feeding and discharging conveyors. A support frame is mounted on one side of the testing platform, and a testing cover is mounted on the support frame via a hydraulic cylinder. When the testing cover is pressed downwards, it can seal tightly against the testing seat. A ventilation component and a pressure detector are mounted on the testing cover. A fixed column is movably mounted on one side of the testing platform along the conveying direction, and a supporting beam is mounted on the fixed column. A mounting frame is retractably mounted on the inner side of the supporting beam, and clamping frames are symmetrically mounted on the mounting frame. Each clamping frame is equipped with a battery clamping component.

[0011] The present invention is further configured such that each group of battery clamping assemblies includes a clamping plate, and two clamping plates are symmetrically arranged in each group. A synchronous opposing moving component is provided between the two clamping plates and the clamping frame, so that the clamping is achieved during battery transfer by moving the clamping plates.

[0012] The present invention is further configured such that the synchronous opposing movement component includes a bidirectional ball screw, and two sets of screw nuts are symmetrically arranged to cooperate with the bidirectional ball screw. The clamping plate is arranged on the corresponding screw nut, and the bidirectional ball screw is mounted on the corresponding clamping frame. A screw motor is arranged on the clamping frame in cooperation with the bidirectional ball screw. When the screw motor is started, the bidirectional ball screw is controlled to run, so that the corresponding two sets of screw nuts can generate synchronous opposing displacement, thereby allowing the clamping plates located on both sides of the battery to move and clamp the sides of the battery, preparing for the subsequent transfer of the battery.

[0013] The present invention is further configured such that an electric push rod is provided on the supporting crossbeam, the extension direction of the electric push rod is perpendicular to the battery conveying direction, the mounting bracket is provided at the output end of the electric push rod, and a limiting telescopic rod is provided between the mounting bracket and the supporting crossbeam. The limiting telescopic rod cooperates with the electric push rod. When the electric push rod is activated, the mounting bracket can move horizontally relative to the supporting crossbeam, so that the clamping plate can vertically approach or move away from the corresponding battery. When it is necessary to clamp the battery, the electric push rod is controlled to extend, so that the clamping plate can be located on both sides of the corresponding battery, thereby facilitating the subsequent clamping of the battery. When the battery is transferred and it is necessary to move away from the battery, the clamping plate is released from the battery, and the electric push rod is controlled to retract, so as to carry out a new round of battery airtightness testing.

[0014] The present invention is further configured such that a lifting groove is provided on the fixed column, an electric cylinder is provided in the lifting groove, and a lifting column is provided at the output end of the electric cylinder. The bottom end of the lifting column is slidably located in the lifting groove, and the top end is used to install a support beam. When the electric cylinder is activated, the lifting column can be controlled to rise and fall in the lifting groove, thereby realizing the lifting and falling control of the clamping plate. When realizing the loading and unloading displacement after the new energy vehicle battery testing is completed, it is necessary to control the battery to move slightly upward and detach from the support surface, thereby reducing the friction at the bottom when the battery moves and improving the testing protection of the battery.

[0015] The present invention is further configured such that an electric slide rail is provided on one side of the testing platform, and a slide table is provided on the electric slide rail. The fixing column is located at the top of the slide table. The movement of the fixing column along the conveying direction can be controlled by the cooperation of the electric slide rail and the slide table. After the clamping plate clamps and fixes the two sets of batteries, the synchronous displacement of the two sets of batteries can be achieved. This allows the new energy vehicle batteries located on the testing seat to be moved to the unloading conveyor belt for unloading, while the new energy batteries on the loading conveyor belt can be moved to the testing seat position for the next round of testing. This reduces the waiting time for loading and unloading and improves the testing efficiency.

[0016] The present invention is further configured such that the ventilation component includes an air inlet pipe, which is arranged in a ring inside the detection hood. An air pump is provided on the support frame, and an air delivery hose is provided between the air pump and the air inlet pipe. Multiple jet nozzle structures can be evenly arranged on the air inlet pipe. The present invention places the air pump on the support frame, which can reduce the load on the detection hood and avoid the situation where the detection hood becomes unbalanced due to gravity after long-term use, thus affecting the airtightness of the detection.

[0017] The present invention is further configured such that a refining shroud is provided on the inner side of the detection shroud in conjunction with the air inlet pipe. The refining shroud has a ventilation slot, and a refining mesh plate is provided inside the ventilation slot. In this way, the airflow blown out by the air inlet pipe can enter the refining shroud and be refined and segmented by the refining mesh plate when it flows out of the ventilation slot, thereby reducing the impact force of the airflow when it enters the detection shroud, reducing the impact force of the airflow on the air pressure detection effect, reducing the waiting time for air pressure to stabilize, and improving the detection effect and detection efficiency.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, this utility model provides a device for testing the airtightness of new energy vehicle batteries, which has the following beneficial effects:

[0020] 1. This utility model adopts a feeding conveyor belt, a testing platform, and a discharging conveyor belt arranged in sequence. The testing platform is equipped with a testing seat. In this way, when testing new energy batteries, the batteries can be fed through the feeding conveyor belt, then transferred to the testing platform for airtightness testing. After the test is completed, the batteries are transferred to the discharging conveyor belt for discharging. This enables a streamlined operation for battery airtightness testing and reduces the floor space occupied by the production line in the workshop.

[0021] 2. This utility model, through the assembly line design of the feeding conveyor belt, the testing table, and the unloading conveyor belt, combined with the synchronously movable clamping components, realizes continuous operation of new energy vehicle battery testing. Under the coordinated control of components such as electric slide rails, electric cylinders, and bidirectional ball screws, the clamping plate can simultaneously complete the transfer of feeding and unloading, reducing the waiting time caused by single operation in traditional testing. In addition, the sealed fit between the testing cover and the testing seat and the rapid response of the air pressure detector further shorten the testing cycle and significantly improve the overall testing efficiency, making it suitable for the rapid testing needs of large-scale battery production lines.

[0022] 3. In the process of battery transfer, this utility model uses a lifting column to control the clamping plate to lift the battery and remove it from the conveyor surface, thus avoiding the bottom friction damage caused by the traditional pushing method. The clamping plate adopts a synchronous opposite movement design to ensure uniform distribution of clamping force and avoid local squeezing deformation. At the same time, the design of the detection seat being level with the conveyor belt reduces the drop impact during battery transfer, further protecting the appearance and structural integrity of the battery.

[0023] 4. The annular air inlet pipe set inside the detection cover of this utility model, together with the fine shroud and fine mesh plate, can disperse the airflow into uniform micro-pressure, avoiding the direct impact of high-pressure airflow on the battery surface and affecting the airtightness detection judgment; the air pressure detector can quickly acquire data through a stable airflow environment, reducing the reading error caused by airflow fluctuations in traditional detection. In addition, the independently set air pump supplies air through the air delivery hose, which reduces the load on the detection cover and ensures the stability of the sealing structure during long-term use, thereby improving the reliability and repeatability of the test results. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a new energy vehicle battery airtightness testing device according to the present invention.

[0025] Figure 2 This is a schematic diagram of the cooperative structure between the feeding conveyor belt, the testing platform, and the unloading conveyor belt in this utility model;

[0026] Figure 3 This is a schematic diagram of the overall installation structure of the clamping plate in this utility model;

[0027] Figure 4This is a schematic diagram of the installation structure of the clamping plate on the mounting frame in this utility model;

[0028] Figure 5 This is a cross-sectional view of the internal structure of the protective cover in this utility model;

[0029] Figure 6 This is a cross-sectional view of the cooperation structure between the fixed column and the lifting column in this utility model.

[0030] In the diagram: 1. Feeding conveyor belt; 2. Inspection table; 3. Unloading conveyor belt; 4. Inspection seat; 5. Support frame; 6. Inspection cover; 7. Air pressure detector; 8. Fixed column; 9. Support beam; 10. Mounting frame; 11. Clamping frame; 12. Clamping plate; 13. Bidirectional ball screw; 14. Screw nut; 15. Screw motor; 16. Electric push rod; 17. Limiting telescopic rod; 18. Lifting groove; 19. Electric cylinder; 20. Lifting column; 21. Electric slide rail; 22. Slide table; 23. Air inlet pipe; 24. Air pump; 25. Air delivery hose; 26. Refining cover; 27. Ventilation slot; 28. Refining mesh plate. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0033] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0034] Please see Figures 1-6A new energy vehicle battery air tightness testing device includes, in sequence, a feeding conveyor belt 1, a testing platform 2, and a discharging conveyor belt 3. A testing seat 4 is provided on the testing platform 2, and the testing seat 4 is flush with the conveying surfaces of the feeding conveyor belt 1 and the discharging conveyor belt 3. A support frame 5 is provided on one side of the testing platform 2, and a testing cover 6 is provided on the support frame 5 via a hydraulic cylinder. When the testing cover 6 is pressed down, it can seal and fit with the testing seat 4. A ventilation component and an air pressure detector 7 are provided on the testing cover 6. A fixed column 8 is movably provided on one side of the testing platform 2 along the conveying direction. A support beam 9 is provided on the fixed column 8 and can be raised and lowered. An installation frame 10 is provided on the inner side of the support beam 9 and can be extended and retracted. Clamping frames 11 are symmetrically provided on the installation frame 10, and each clamping frame 11 is provided with a battery clamping component.

[0035] Each battery clamping assembly includes a clamping plate 12. There are two clamping plates 12 symmetrically arranged in each assembly. A synchronously moving component is provided between the two clamping plates 12 and the clamping frame 11. The clamping is achieved during battery transfer by moving the clamping plates 12.

[0036] Furthermore, the synchronous opposing movement component in this utility model includes a bidirectional ball screw 13, and two sets of screw nuts 14 are symmetrically arranged to cooperate with the bidirectional ball screw 13. Clamping plates 12 are arranged on the corresponding screw nuts 14. The bidirectional ball screw 13 is mounted on the corresponding clamping frame 11. A screw motor 15 is arranged on the clamping frame 11 in cooperation with the bidirectional ball screw 13. When the screw motor 15 is started, the bidirectional ball screw 13 is controlled to run, so that the corresponding two sets of screw nuts 14 can generate synchronous opposing displacement, thereby allowing the clamping plates 12 located on both sides of the battery to move and clamp the sides of the battery, preparing for the subsequent transfer of the battery.

[0037] Please see Figures 1-6 As one implementation of the supporting beam 9: an electric push rod 16 is provided on the supporting beam 9, the extension direction of the electric push rod 16 is perpendicular to the battery conveying direction, the mounting frame 10 is provided at the output end of the electric push rod 16, and a limit telescopic rod 17 is provided between the mounting frame 10 and the supporting beam 9. The limit telescopic rod 17 cooperates with the electric push rod 16. When the electric push rod 16 is activated, the mounting frame 10 can move horizontally relative to the supporting beam 9, so that the clamping plate 12 can vertically approach or move away from the corresponding battery. When it is necessary to clamp the battery, the electric push rod 16 is controlled to extend, so that the clamping plate 12 can be located on both sides of the corresponding battery, thereby facilitating the subsequent clamping of the battery. When the battery transfer is completed and it is necessary to move away from the battery, the clamping plate 12 is released from the battery, and the electric push rod 16 is controlled to retract, so as to carry out a new round of battery airtightness testing.

[0038] Please see Figures 1-6As one implementation of the supporting beam 9: a lifting groove 18 is provided on the fixed column 8, an electric cylinder 19 is provided in the lifting groove 18, and a lifting column 20 is provided at the output end of the electric cylinder 19. The bottom end of the lifting column 20 is slidably located in the lifting groove 18, and the top end is used to install the supporting beam 9. When the electric cylinder 19 is activated, the lifting column 20 can be controlled to rise and fall in the lifting groove 18, thereby realizing the lifting control of the clamping plate 12. When realizing the loading and unloading displacement after the new energy vehicle battery testing is completed, it is necessary to control the battery to move slightly upward and detach from the supporting surface, thereby reducing the friction at the bottom when the battery moves and improving the battery testing protection.

[0039] Please see Figures 1-6 As one implementation method for the fixed column 8: an electric slide rail 21 is provided on one side of the testing platform 2, and a slide table 22 is provided on the electric slide rail 21. The fixed column 8 is located at the top of the slide table 22. The movement of the fixed column 8 along the conveying direction can be controlled by the cooperation of the electric slide rail 21 and the slide table 22. After the clamping plate 12 clamps and fixes the two sets of batteries, the synchronous displacement of the two sets of batteries can be achieved. This allows the new energy vehicle batteries located on the testing seat 4 to be moved to the unloading conveyor belt 3 for unloading, while the new energy batteries on the loading conveyor belt 1 can be moved to the testing seat 4 for the next round of testing. This reduces the waiting time for loading and unloading and improves the testing efficiency.

[0040] Please see Figures 1-6 As one embodiment of the ventilation component: the ventilation component includes an air inlet pipe 23, which is arranged in a ring inside the detection cover 6. An air pump 24 is provided on the support frame 5. An air delivery hose 25 is provided between the air pump 24 and the air inlet pipe 23. Multiple air jet structures can be evenly arranged on the air inlet pipe 23. In this utility model, the air pump 24 is placed on the support frame 5, which can reduce the load on the detection cover 6 and avoid the situation where the detection cover 6 becomes unbalanced due to gravity after long-term use, thus affecting the airtightness of the detection.

[0041] Furthermore, this invention provides a refining shroud 26 on the inner side of the detection shroud 6 in conjunction with the air inlet pipe 23. The refining shroud 26 has a ventilation slot 27, and a refining mesh plate 28 is provided inside the ventilation slot 27. In this way, the airflow blown out by the air inlet pipe 23 can enter the refining shroud 26 and be refined and segmented by the refining mesh plate 28 when it flows out of the ventilation slot 27. This reduces the impact force of the airflow when it enters the detection shroud 6, reduces the impact force of the airflow on the air pressure detection effect, reduces the waiting time for air pressure to stabilize, and improves the detection effect and detection efficiency.

[0042] In summary:

[0043] This utility model adopts a feeding conveyor belt 1, a testing platform 2, and a discharging conveyor belt 3 arranged in sequence. The testing platform 2 is equipped with a testing seat 4. In order to realize the testing of new energy batteries, the batteries can be fed through the feeding conveyor belt 1, and then transferred to the testing platform 2 for air tightness testing. After the test is completed, the batteries are transferred to the discharging conveyor belt 3 for discharging. In this way, the battery air tightness testing can be carried out in a streamlined manner, while reducing the floor space occupied by the production line in the workshop.

[0044] This utility model uses two sets of clamps with adjustable height and position to transfer the battery during and after testing, and can realize synchronous loading and unloading. This can reduce the friction of the bottom of the battery during testing and transfer, improve testing efficiency, and reduce waiting time during loading and unloading.

[0045] In use, the new energy vehicle battery to be tested is first placed at equal intervals on the feeding conveyor belt 1. This step can be completed by an existing robotic arm according to a set program, and will not be described in detail in this utility model.

[0046] Afterwards, when the material is transported to the appropriate position, the transport is stopped, and the movement of components such as the fixed column 8, the lifting column 20, and the mounting frame 10 is controlled so that the two clamping plates 12 at the loading end are respectively located at appropriate heights on both sides of the battery to be tested closest to the detection seat 4.

[0047] Then, the two clamping plates 12 are moved inward by the operation of the lead screw motor 15 to clamp the battery to be tested.

[0048] Then, the lifting column 20 is controlled by the electric cylinder 19 to drive the clamping plate 12 to move upward, so that the battery to be transferred is removed from the carrier surface, and the fixing column 8 is controlled to move along the conveying direction, so that the battery to be tested is moved to a suitable position on the testing seat 4 and the battery is placed on the testing seat 4.

[0049] Then, the clamping plate 12 is disengaged from the battery, and the clamping plate 12 is disengaged from the detection seat 4 by the electric push rod 16;

[0050] This causes the detection seat 4 to move downward under the action of the hydraulic cylinder, thus sealing and fitting with the detection seat 4.

[0051] Then, under the action of the air pump 24, gas is introduced into the test seat 4 through the cooperation of the air supply pipe and the air inlet pipe 23. The gas enters the test cover 6 evenly through the fine mesh plate 28. The change of the pressure tester value is observed to determine whether the air tightness of the new energy vehicle battery under test is qualified.

[0052] After the test is completed, the clamping plate 12 is moved again so that the clamping plate 12 at the feeding end is aligned with the battery at the end of the feeding conveyor belt 1, and at the same time the clamping plate 12 at the discharging end is aligned with the battery on the testing seat 4. Thus, the batteries that have been tested on the testing seat 4 can be transferred to the unloading conveyor belt 3, and the batteries on the feeding conveyor belt 1 can be transferred to the testing seat 4 for further testing. This reduces the time gap between loading and unloading during battery airtightness testing and improves testing efficiency.

[0053] In this invention, the telescopic drive control components such as electric cylinders, electric push rods, and hydraulic cylinders can be flexibly replaced with each other according to actual production needs, and this invention does not impose strict limitations on this.

[0054] In all the solutions mentioned above, the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although the embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

[0055] In all the solutions mentioned above, those involving the operation of electrical components, unless otherwise specified, are controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and circuit connections are existing, well-known, and mature technologies, and their specific circuit structures will not be described in detail here.

[0056] Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies, and this utility model will not elaborate on them.

[0057] If any of the technical solutions mentioned above involve a synchronous belt drive structure, and there is no specific structure, they are all existing technologies involving the combination of synchronous belt and synchronous pulley. The connection between the synchronous belt and the shaft structure is a known technology and will not be elaborated upon in this utility model.

[0058] Of all the solutions mentioned above, those involving the connection between solar panels and batteries can be equipped with essential accessories such as inverters, battery charging controllers, cables, fuses, and brackets. Their control principles and circuit connections are all existing, well-known, and mature technologies, and their specific circuit structures will not be elaborated here.

Claims

1. A new energy vehicle battery airtightness detection device, in turn comprising a feeding conveyor belt (1), a detection table (2) and a discharging conveyor belt (3), characterized in that: The testing platform (2) is provided with a testing seat (4), which is flush with the conveying surfaces of the feeding conveyor belt (1) and the unloading conveyor belt (3). A support frame (5) is provided on one side of the testing platform (2). A testing cover (6) is provided on the support frame (5) via a hydraulic cylinder. When the testing cover (6) is pressed down, it can seal against the testing seat (4). A ventilation component and a pressure detector (7) are provided on the testing cover (6). A fixed column (8) is provided on one side of the testing platform (2) along the conveying direction. A support beam (9) is provided on the fixed column (8). An installation frame (10) is provided on the inner side of the support beam (9). A clamping frame (11) is symmetrically provided on the installation frame (10). A battery clamping component is provided on each clamping frame (11).

2. The new energy vehicle battery air tightness detection device according to claim 1, characterized in that: Each battery clamping assembly includes a clamping plate (12), and two clamping plates (12) are symmetrically arranged in each group. A synchronously moving component is provided between the two clamping plates (12) and the clamping frame (11).

3. The airtightness testing device for a new energy vehicle battery according to claim 2, characterized in that: The synchronous opposing movement component includes a bidirectional ball screw (13) and two sets of screw nuts (14) are symmetrically arranged in conjunction with the bidirectional ball screw (13). The clamping plate (12) is arranged on the corresponding screw nut (14). The bidirectional ball screw (13) is mounted on the corresponding clamping frame (11). The clamping frame (11) is equipped with a screw motor (15) in conjunction with the bidirectional ball screw (13).

4. The airtightness testing device for new energy vehicle batteries according to claim 1, characterized in that: An electric push rod (16) is provided on the supporting beam (9). The extension direction of the electric push rod (16) is perpendicular to the battery conveying direction. The mounting bracket (10) is provided at the output end of the electric push rod (16) and a limiting telescopic rod (17) is provided between it and the supporting beam (9). The limiting telescopic rod (17) cooperates with the electric push rod (16).

5. The airtightness testing device for a new energy vehicle battery according to claim 1, characterized in that: The fixed column (8) is provided with a lifting groove (18), and an electric cylinder (19) is provided in the lifting groove (18). The output end of the electric cylinder (19) is provided with a lifting column (20). The bottom end of the lifting column (20) is slidably located in the lifting groove (18), and the top end is used to install a support beam (9).

6. The airtightness testing device for a new energy vehicle battery according to claim 5, characterized in that: An electric slide rail (21) is provided on one side of the testing platform (2), and a slide table (22) is provided on the electric slide rail (21). The fixing column (8) is located at the top of the slide table (22).

7. The airtightness testing device for a new energy vehicle battery according to claim 1, characterized in that: The ventilation assembly includes an air inlet pipe (23), which is arranged in a ring inside the detection cover (6). An air pump (24) is provided on the support frame (5), and an air delivery hose (25) is provided between the air pump (24) and the air inlet pipe (23).

8. The airtightness testing device for a new energy vehicle battery according to claim 7, characterized in that: The inner side of the detection cover (6) is equipped with a fine hood (26) in conjunction with the air inlet pipe (23). The fine hood (26) has a ventilation slot (27), and a fine mesh plate (28) is provided inside the ventilation slot (27).

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