An airtightness testing device for a battery box

Abstract

The present invention discloses an airtightness testing device for a battery box, relating to the technical field of battery box detection, comprising a base, an upper surface of the base is provided with a placing platform, an upper surface of the placing platform is provided with a detection box sample and a detection mechanism, the detection mechanism comprises a gas supply component and a temperature control component, the gas supply component comprises: an air pump, the air pump is provided on the upper surface of the base, an air supply pipe is connected to the air supply end of the air pump, an air inlet pipe is provided on a side surface of the detection box sample close to the air pump, one end of the air inlet pipe is connected to one end of the connecting air supply pipe, a compressed air pipe is provided at the connection between the air inlet pipe and the connecting air supply pipe, an air outlet pipe is provided on a side surface of the detection box sample facing away from the air inlet pipe, and an air outlet pipe is provided at the end of one end of the air outlet pipe located inside the detection box sample. In this scheme, by providing the detection mechanism, all-round and high-precision testing of the air tightness of the battery box at different temperatures is achieved, thereby ensuring the accuracy of the test results.

Description

Technical Field

[0001] The present invention relates to the technical field of battery box detection, and in particular to an air tightness testing device for a battery box. Background Art

[0002] As an important component of energy storage equipment, the airtightness of the battery box is directly related to the safety, stability and service life of the battery system. With the rapid development of new energy vehicles, energy storage power stations and other fields, the airtightness requirements of the battery box are becoming increasingly higher. Traditional airtightness testing methods mostly use static pressure testing, that is, at fixed temperature and pressure, the airtightness performance is judged by measuring the changes in the internal pressure of the box.

[0003] Traditional technologies have many limitations when conducting testing. In actual applications, batteries work in a complex and changeable environment with a wide temperature range (-20℃~60℃). In addition, due to the thermal expansion and contraction effects, the box materials such as metal and plastic may undergo slight deformation when the temperature changes, which in turn affects the sealing performance of the box. Traditional testing equipment often lacks a dynamic control mechanism and cannot accurately simulate the changes in the airtightness of the battery at different temperatures. In addition, most of the detection mechanisms in the existing technology are simple in design and can only realize basic pressure input and detection functions. They lack the ability to flexibly respond to temperature changes and can often only perform testing at a single temperature point. They cannot simulate the continuous temperature change process of the battery in actual operation, thereby limiting the accuracy and practicality of the test. Summary of the Invention

[0004] The object of the present invention is to provide an airtightness testing device for a battery box to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an airtightness testing device for a battery box, comprising:

[0006] The base is provided with a placing platform on the upper surface of the base, and a detection box sample and a detection mechanism are provided on the upper surface of the placing platform. The detection mechanism includes a gas delivery component and a temperature control component. The gas delivery component includes: an air pump, the air pump is provided on the upper surface of the base, and a connecting gas pipe is connected to the gas delivery end of the air pump. An air inlet pipe is provided on the side surface of the detection box sample close to the air pump, one end of the air inlet pipe is connected to one end of the connecting gas pipe, and a compressed air pipe is provided at the connection between the air inlet pipe and the connecting gas pipe, and an air outlet pipe is provided on the side surface of the detection box sample facing away from the air inlet pipe, and an air outlet pipe is provided at the end of one end of the air outlet pipe located inside the detection box sample.

[0007] Further, an air outlet branch pipe is provided on the bottom surface of the air pressure pipe, two detection tanks are provided on the upper surface of the base, the air outlet branch pipe is communicated with the lower side surfaces of the two detection tanks, and an opening communicating with the air outlet branch pipe is formed on the inner bottom surface of the air pressure pipe.

[0008] Further, a movable inner pipe is provided inside the air pressure pipe. An air outlet opening matching the opening is formed on the inner bottom surface of the movable inner pipe. A force-bearing arc plate is provided at one end of the movable inner pipe. Surface convex blocks are provided on both the upper and lower surfaces of the movable inner pipe. A sliding groove facilitating the sliding of the surface convex blocks is formed on the inner side surface of the air pressure pipe.

[0009] Further, two fixing pieces are provided at one end of the air pressure pipe. A connecting spring is provided between the fixing piece and one side surface of the surface convex block. An air passage is further formed on the inner side surface of the air pressure pipe, and an air inlet opening matching the air passage is formed on the inner bottom surface of the air pressure pipe.

[0010] Further, four movable air plates are provided on the surface of the air port pipe. A connecting torsion spring is provided at the connection between the movable air plate and the air port pipe. A small motor is further provided at the center of the air port pipe. A threaded rod is provided at the output end of the small motor, and a meshing block is meshed on the surface of the threaded rod.

[0011] Further, an elastic contraction rod is provided on the side surface of the meshing block, a roller is provided at the end of the elastic contraction rod, a sliding groove matching the roller is formed on the inner side surface of the movable air plate, and air valves are provided on the surfaces of both the air outlet pipe and the air inlet pipe.

[0012] Further, the temperature control component includes: a temperature adjustment platform, which is arranged inside the sample of the detection box body. A cooler is arranged at the center of the temperature adjustment platform. A partition is arranged on one side surface of the cooler. A rotatable movable plate body is further arranged at the center of the temperature adjustment platform. An electric heater is arranged on one side surface of the movable plate body. A driving motor is arranged on one side surface of the movable plate body and is arranged inside the temperature adjustment platform.

[0013] Further, connecting rods are provided on both side surfaces of the movable plate body. The other ends of the connecting rods are provided with shielding plates. Connecting shafts are provided on both side surfaces of the shielding plates. A temperature detector and a pressure detector are further provided on the side surface of the detection box body sample.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. In this solution, by setting up a gas transmission component, through the air pump and the connecting gas pipeline, gas with a specified pressure can be accurately input into the sample in the detection box, ensuring the reliability of the test results. The movable inner tube and the pressure gas pipe form a dynamic pressure compensation system. When the internal pressure of the sample in the detection box changes, the movable inner tube can automatically adjust its position according to the pressure difference, supplement gas into the box through the air duct or release excess gas through the air outlet pipe, thereby maintaining the stability of the internal pressure and improving the test accuracy and response speed. The air port pipe and its supporting movable air plate, elastic contraction rod and other components form a gas discharge system, which can automatically adjust the opening degree according to the change of the internal pressure, effectively preventing the damage of the box caused by excessive pressure or inaccurate testing.

[0016] 2. In this solution, by setting up a temperature control component, through the coordinated action of the cooler and the electric heater, the temperature control component can simulate the temperature range when the box actually works. This helps to comprehensively evaluate the airtight performance of the battery box under different temperature conditions and ensure its reliability in various extreme environments. At the same time, through the cooperation of the baffle and the connecting rod, the temperature stability during the refrigeration or heating process is ensured, avoiding the influence of temperature fluctuation on the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the overall structural schematic diagram of the present invention;

[0018] Figure 2 is the internal structural schematic diagram of the present invention;

[0019] Figure 3 is the structural schematic diagram of the temperature control table of the present invention;

[0020] Figure 4 is the internal structural schematic diagram of the movable inner tube of the present invention;

[0021] Figure 5 is the internal structural schematic diagram of the pressure gas pipe of the present invention;

[0022] Figure 6 is the structural schematic diagram of the movable plate body of the present invention;

[0023] Figure 7 is the internal structural schematic diagram of the air port pipe of the present invention;

[0024] Figure 8 is the structural schematic diagram of the meshing block of the present invention.

[0025] In the figure: 1. Base; 2. Placing platform; 3. Detected box sample; 4. Temperature detector; 5. Pressure detector; 6. Air pump; 7. Connecting gas pipeline; 8. Detection tank body; 9. Inlet pipe; 10. Outlet pipe; 11. Gas valve; 12. Air port pipe; 13. Temperature adjusting platform; 14. Compressed air pipe; 15. Refrigerator; 16. Partition board; 17. Movable plate body; 18. Electric heater; 19. Driving motor; 20. Outlet branch pipe; 21. Movable inner pipe; 22. Surface convex block; 23. Connecting spring; 24. Outlet opening; 25. Inlet opening; 26. Force-receiving arc plate; 27. Fixed piece; 28. Air passage; 29. Connecting rod; 30. Baffle plate; 31. Connecting shaft; 32. Movable air plate; 33. Sliding groove; 34. Small motor; 35. Connecting torsion spring; 36. Threaded rod; 37. Engaging block; 38. Elastic contraction rod; 39. Roller. Detailed implementation manner

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to 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 creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1: Please refer to Figures 1 to 8 , an airtightness testing device for a battery box body, comprising:

[0028] Base 1, a placement platform 2 is provided on the upper surface of the base 1, a detection box sample 3 and a detection mechanism are provided on the upper surface of the placement platform 2, the detection mechanism includes an air delivery component and a temperature control component, and the air delivery component includes: an air pump 6, the air pump 6 is provided on the upper surface of the base 1, a connecting air pipe 7 is connected to the air delivery end of the air pump 6, an air inlet pipe 9 is provided on the surface of the detection box sample 3 close to the air pump 6, one end of the air inlet pipe 9 is connected to one end of the connecting air pipe 7, a pressure air pipe 14 is provided at the connection of the air inlet pipe 9 and the connecting air pipe 7, an air outlet branch pipe 20 is provided on the bottom surface of the pressure air pipe 14, two detection tanks 8 are provided on the upper surface of the base 1, and the air outlet branch pipe 20 communicates with the lower side surfaces of the two detection tanks 8. An opening communicating with the air outlet branch pipe 20 is provided on the inner bottom surface of the pressure air pipe 14. An activatable inner tube 21 is provided inside the pressure air pipe 14. An air outlet opening 24 matching the opening is provided on the inner bottom surface of the activatable inner tube 21. A force-receiving arc plate 26 is provided at one end of the activatable inner tube 21. Surface bumps 22 are provided on both the upper and lower surfaces of the activatable inner tube 21. A sliding groove facilitating the sliding of the surface bumps 22 is provided on the inner side surface of the pressure air pipe 14. Two fixing pieces 27 are provided at one end of the pressure air pipe 14. A connecting spring 23 is provided between the fixing piece 27 and one side surface of the surface bump 22. An air passage 28 is further provided on the inner side surface of the pressure air pipe 14. An air inlet opening 25 matching the air passage 28 is provided on the inner bottom surface of the pressure air pipe 14. An air outlet pipe 10 is provided on the surface of the detection box sample 3 away from the air inlet pipe 9. An air port pipe 12 is provided at the end of the end of the air outlet pipe 10 located inside the detection box sample 3. Four activatable air plates 32 are provided on the surface of the air port pipe 12. A connecting torsion spring 35 is provided at the connection of the air plate 32 and the air port pipe 12. A small motor 34 is further provided at the center of the air port pipe 12. A threaded rod 36 is provided on the output end of the small motor 34. A meshing block 37 is meshed on the surface of the threaded rod 36. An elastic contraction rod 38 is provided on the side surface of the meshing block 37. A roller 39 is provided at the end of the elastic contraction rod 38. A sliding groove 33 matching the roller 39 is provided on the inner side surface of the air plate 32. Air valves 11 are provided on the surfaces of both the air outlet pipe 10 and the air inlet pipe 9;

[0029] During use, the staff first place the detection box sample 3 above the placement platform 2 on the upper surface of the base 1. Subsequently, connect the connecting air pipe 7 on the side surface of the air pump 6 to the pressure air pipe 14 on the side surface of the detection box sample 3. Then, when starting the experiment, first, the staff fill the inside of the detection box sample 3 with gas at a specified pressure through the air pump 6. After inputting the specified amount of gas, the staff close the air valve 11 on the surface of the pressure air pipe 14 and the air outlet pipe 10. Subsequently, by observing the pressure detector 5 after a certain period of time, the staff can judge the airtightness of the detection box sample 3. However, during the actual use of the battery, its temperature will gradually change. The normal operating temperature range is (-20°C to 60°C), and the battery box is usually made of metal, plastic or other composite materials. These materials may undergo slight deformation or expansion / contraction when the temperature changes. This deformation may affect the sealing performance of the battery box wall, resulting in a change in airtightness. Therefore, after a normal airtightness test, the staff can improve the internal temperature of the detection box sample 3 through the temperature control component to simulate the change in airtightness under normal battery use. After the temperature control component is activated by the staff, the air pressure inside will change due to the influence of temperature, causing a relatively large change in the internal air pressure compared to the normal temperature state, and it is impossible to achieve a more accurate detection effect with the same air pressure detection as the normal temperature detection. After the temperature control component is activated, the staff open the air valves 11 on both sides of the detection box sample 3 and adjust the output power of the air pump 6 to supply gas with the same pressure as the internal air pressure to the inside of the detection box sample 3. At this time, when the pressure inside the detection box sample 3 begins to decrease, the gas transported into the intake pipe 9 of the detection box sample 3 will push the movable inner tube 21 to one side of the detection box sample 3 under the action of the pressure. Since the movable inner tube 21 is restricted by two connecting springs 23, it can drive the movable inner tube 21 to slide inside the pressure air pipe 14 as long as the air pressure received is greater than the internal air pressure of the detection box sample 3. After the movable inner tube 21 slides towards one side of the detection box sample 3 under the action of the force, the air outlet opening 24 on its bottom surface loses the engagement effect with the opening above the air outlet branch pipe 20. After the intake opening 25 engages with the air passage 28, the gas is input into the inside of the detection box sample 3 through the air passage 28 to increase the pressure inside it. The air port pipe 12 on the other side inside the detection box sample 3 is used to discharge a certain amount of gas when the pressure inside the detection box sample 3 is stronger than the basic pressure. In the case of excessive pressure, the movable air plate 32 on the surface of the air port pipe 12 rotates downward under the action of the pressure and presses down on the roller 39 and the elastic contraction rod 38, driving the elastic contraction rod 38 to contract. The staff can drive the small motor 34 to rotate through a signal, so that the threaded rod 36 drives the engaging block 37 to move through the meshing effect with the engaging block 37.Adjust the pressure requirement for opening the movable air plate 32 accordingly to meet different pressure test requirements. Through the pressure control of the air port pipe 12 and the pressure air pipe 14, the inside of the test box sample 3 can conduct airtightness tests at different temperatures during the simulation of normal use while maintaining the same horizontal pressure. When the internal pressure level is normal, the movable inner pipe 21 is pushed back to its original position under the action of the internal air pressure. At this time, the gas transported by the air pump 6 is transported to the inside of the test tank 8 through the air outlet opening 24 and the air outlet branch pipe 20. The inside of the test tank 8 is filled with water. The staff can observe with the naked eye whether gas bubbles are generated inside the test tank 8 to judge whether the internal air pressure standard of the test box sample 3 is normal. The staff can judge the temperature inside the test box sample 3 by observing the temperature detector 4 and select to conduct airtightness tests at different temperatures.,

[0030] The temperature control component includes: a temperature adjustment table 13, the temperature adjustment table 13 is arranged inside the test box sample 3, one side surface of the small motor 34 is connected to one side surface of the temperature adjustment table 13, a cooler 15 is arranged at the center of the temperature adjustment table 13, a partition 16 is arranged on one side surface of the cooler 15, a rotatable movable plate body 17 is also arranged at the center of the temperature adjustment table 13, an electric heater 18 is arranged on one side surface of the movable plate body 17, a driving motor 19 is arranged on one side surface of the movable plate body 17, the driving motor 19 is arranged inside the temperature adjustment table 13, connecting rods 29 are arranged on both side surfaces of the movable plate body 17, the other ends of the connecting rods 29 are provided with shielding plates 30, connecting shafts 31 are arranged on both side surfaces of the shielding plates 30, and a temperature detector 4 and a pressure detector 5 are also arranged on the side surface of the test box sample 3;

[0031] The temperature control component is used to adjust the temperature inside the test box sample 3 to different degrees under the control of the staff during use, so as to simulate the airtightness of the box temperature under different working conditions. During use, when temperature adjustment is required, the driving motor 19 is rotated through the signal control of the staff, and the movable plate body 17 is driven to rotate. When refrigeration is required, the movable plate body 17 rotates and finally stops under the limitation of the partition 16, and the electric heater 18 is covered by the partition 16. At this time, the shielding plate 30 rotates synchronously with the movable plate body 17 by using the connecting rod 29, and the refrigeration port on the side surface of the cooler 15 is exposed. If heating is carried out, the movable plate body 17 is rotated to expose the electric heater 18, and the electric heater 18 is driven by the signal of the staff to increase the temperature to change the internal temperature.

[0032] The working principle of the present invention is:

[0033] During use, the staff first place the detection box sample 3 above the placement platform 2 on the upper surface of the base 1. Subsequently, connect the connecting air pipe 7 on the side surface of the air pump 6 to the pressure air pipe 14 on the side surface of the detection box sample 3. Then, when starting the experiment, first, the staff fill the inside of the detection box sample 3 with gas at a specified pressure through the air pump 6. After inputting the specified amount of gas, the staff close the air valve 11 on the surface of the air outlet pipe 10 and the pressure air pipe 14. Subsequently, the staff observe the pressure detector 5 after a certain period of time to judge the airtightness of the detection box sample 3. However, during the actual use of the battery, its temperature will gradually change. The normal operating temperature range is (-20°C to 60°C), and the battery box is usually made of metal, plastic, or other composite materials. These materials may undergo slight deformation or expansion / contraction when the temperature changes. This deformation may affect the sealing performance of the battery box wall, resulting in a change in airtightness. Therefore, after a normal airtightness test, the staff can improve the internal temperature of the detection box sample 3 through the temperature control component to simulate the change in airtightness under normal battery use;

[0034] The temperature control component is used to adjust the temperature inside the detection box sample 3 to different degrees under the control of the staff during use, so as to simulate the airtightness of the box temperature under different working conditions. During use, when temperature adjustment is required, the staff signal-controls the driving motor 19 to rotate, which drives the movable plate body 17 to rotate. When refrigeration is required, the movable plate body 17 rotates and finally stops due to the limitation of the partition plate 16, and the partition plate 16 covers the electric heater 18. At this time, the baffle plate 30 rotates synchronously with the movable plate body 17 through the connecting rod 29, and exposes the refrigeration port on the side surface of the refrigerator 15. If heating is carried out, the movable plate body 17 is rotated to expose the electric heater 18, and the staff signals to drive the electric heater 18 to increase the temperature to change the internal temperature;

[0035] After the temperature control component is driven by the staff to start, the air pressure of the internal gas will change due to the influence of temperature, causing a large change in the internal air pressure compared to the normal temperature state. The air pressure detection that cannot maintain the same measurement as the normal temperature detection achieves a more accurate detection effect. After the temperature control component starts, the staff opens the air valves 11 on both sides of the detection box sample 3 and adjusts the output power of the air pump 6 to deliver gas with the same pressure as the internal air pressure of the detection box sample 3 to its interior. At this time, when the pressure inside the detection box sample 3 begins to decrease, the gas transported from the detection box sample 3 into the intake pipe 9 will push the movable inner tube 21 to one side of the detection box sample 3 under the action of the pressure. Because the movable inner tube 21 is restricted by two connecting springs 23, it can drive the movable inner tube 21 to slide inside the pressure pipe 14 as long as the air pressure it receives is greater than the internal air pressure of the detection box sample 3. After the movable inner tube 21 slides towards one side of the detection box sample 3 under force, the air outlet opening 24 on its bottom surface loses the engagement effect with the opening above the air outlet branch pipe 20. After the intake opening 25 engages with the air passage 28, the gas is input into the interior of the detection box sample 3 through the air passage 28 to increase the pressure inside it. The air pipe 12 on the other side inside the detection box sample 3 is used to discharge a certain amount of gas when the pressure inside the detection box sample 3 is stronger than the basic pressure. In the case of excessive pressure, the movable air plate 32 on the surface of the air pipe 12 rotates downward under the action of the pressure and presses downward on the roller 39 and the elastic contraction rod 38, driving the elastic contraction rod 38 to contract. The staff can drive the small motor 34 to rotate through a signal, causing the threaded rod 36 to drive the engaging block 37 to move through the meshing effect with the engaging block 37, thereby adjusting the pressure requirement for the movable air plate 32 to open and meeting different pressure experiment requirements. Through the pressure control of the air pipe 12 and the pressure pipe 14, the interior of the detection box sample 3 can conduct airtightness experiments at different temperatures during the normal use process while maintaining the same level of pressure. When the internal pressure level is normal, the movable inner tube 21 is pushed back to its original position by the action of the internal air pressure. At this time, the gas transported by the air pump 6 is transported to the interior of the detection tank 8 through the air outlet opening 24 and the air outlet branch pipe 20. The interior of the detection tank 8 is filled with water. The staff can visually observe whether gas bubbles are generated inside the detection tank 8 to determine whether the internal air pressure standard of the detection box sample 3 is normal. The staff can judge the temperature inside the detection box sample 3 by observing the temperature detector 4 and select to conduct airtightness experiments at different temperatures.

[0036] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. An airtightness testing device for a battery box, characterized in that, Including: A base (1), on the upper surface of the base (1) there is a placement platform (2), on the upper surface of the placement platform (2) there is a detection box sample (3) and a detection mechanism. The detection mechanism includes an air delivery component and a temperature control component. The air delivery component includes: an air pump (6), the air pump (6) is arranged on the upper surface of the base (1), a connecting air pipe (7) is connected to the air delivery end of the air pump (6). On one side surface of the detection box sample (3) close to the air pump (6) there is an air inlet pipe (9), one end of the air inlet pipe (9) is connected to one end of the connecting air pipe (7). At the connection of the air inlet pipe (9) and the connecting air pipe (7) there is a pressure air pipe (14). On the side surface of the detection box sample (3) facing away from the air inlet pipe (9) there is an air outlet pipe (10). At the end of the end of the air outlet pipe (10) located inside the detection box sample (3) there is an air port pipe (12); On the surface of the air port pipe (12) there are four movable air plates (32). Inside the inner side surface of the movable air plate (32) there is a sliding groove (33) that cooperates with a roller (39). At the connection of the movable air plate (32) and the air port pipe (12) there is a connecting torsion spring (35). At the center of the air port pipe (12) there is a movable engaging block (37). On the side surface of the engaging block (37) there is an elastic contraction rod (38); On the bottom surface of the pressure air pipe (14) there is an air outlet branch pipe (20). On the upper surface of the base (1) there are two detection tanks (8). The air outlet branch pipe (20) communicates with the lower side surfaces of the two detection tanks (8). On the inner bottom surface of the pressure air pipe (14) there is an opening that communicates with the air outlet branch pipe (20); Inside the pressure air pipe (14) there is a movable inner pipe (21). On the inner bottom surface of the movable inner pipe (21) there is an air outlet opening (24) that cooperates with the opening. One end of the movable inner pipe (21) is provided with a force-bearing arc plate (26). On the upper and lower surfaces of the movable inner pipe (21) there are surface convex blocks (22). On the inner side surface of the pressure air pipe (14) there is a sliding groove that facilitates the sliding of the surface convex blocks (22).

2. The airtightness testing device for a battery box according to claim 1, wherein: At one end of the pressure air pipe (14) there are two fixing pieces (27). Between the fixing piece (27) and one side surface of the surface convex block (22) there is a connecting spring (23). On the inner side surface of the pressure air pipe (14) there is also an air duct (28). On the inner bottom surface of the pressure air pipe (14) there is an air inlet opening (25) that cooperates with the air duct (28).

3. The airtightness testing device for a battery box according to claim 1, characterized in that: The end of the elastic contraction rod (38) is provided with a roller (39). The roller (39) cooperates with the sliding groove (33). On the surfaces of the air outlet pipe (10) and the air inlet pipe (9) there are air valves (11).

4. The airtightness testing device for a battery box according to claim 1, characterized in that: A small motor (34) is also provided at the center of the air inlet pipe (12). A threaded rod (36) is provided at the output end of the small motor (34). The engaging block (37) is arranged on the surface of the threaded rod (36), and an engaging hole engaging with the threaded rod (36) is also formed at the center of the engaging block (37).

5. The airtightness testing device for a battery box according to claim 1, characterized in that: The temperature control component includes: a temperature adjustment table (13) which is arranged inside the detection box sample (3). A cooler (15) is arranged at the center of the temperature adjustment table (13). A partition plate (16) is arranged on one side surface of the cooler (15). A rotatable movable plate body (17) is also arranged at the center of the temperature adjustment table (13). An electric heater (18) is arranged on one side surface of the movable plate body (17). A driving motor (19) is arranged on one side surface of the movable plate body (17), and the driving motor (19) is arranged inside the temperature adjustment table (13).

6. The airtightness testing device for a battery box according to claim 5, characterized in that: Connecting rods (29) are arranged on both side surfaces of the movable plate body (17). The other ends of the connecting rods (29) are provided with shielding plates (30). Connecting shafts (31) are arranged on both side surfaces of the shielding plates (30). A temperature detector (4) and a pressure detector (5) are also arranged on the side surface of the detection box sample (3).

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