A sealing performance test device for lithium battery box

Abstract

This utility model discloses a sealing performance testing device for lithium battery boxes, belonging to the field of lithium battery box testing technology. It includes a base plate, with a connecting block fixed to one side of the upper end of the base plate. A lead screw is threaded into the connecting block, and a movable block is rotatably connected to one end of the lead screw. A fixed block is fixed at the position corresponding to the movable block on the upper end of the base plate. An air pump is installed on the side of the upper end of the base plate away from the connecting block, and the air pump is connected to the fixed block via an air supply pipe. This utility model, by setting a docking assembly, allows the air needle at one end of the connecting pipe to be inserted into the air hole of the lithium battery box, increasing the internal pressure of the lithium battery box. A one-way valve prevents gas backflow. The air pump is then turned off, and the pressure gauge is observed to see if there is a change. A change in the pressure gauge reading indicates poor sealing and leakage in the lithium battery box; conversely, a change in the pressure gauge reading indicates good sealing. The docking assembly facilitates inflation of the lithium battery box and avoids the inconvenience of connecting the air needle to the lithium battery box due to different air hole heights.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery box testing technology, specifically relating to a sealing performance testing device for lithium battery boxes. Background Technology

[0002] The sealing performance testing equipment for lithium battery boxes (battery module or battery pack shells) is a specialized device used to test key indicators such as waterproofing, dustproofing, and airtightness of the battery box to ensure the safety and reliability of the battery system in humid, dusty, or water-related environments.

[0003] Chinese patent application number 2019210156584 discloses a sealing performance testing mechanism for a lithium battery casing, including a fixing component, a testing component, and a gas source. The testing component includes a gas needle and a pressure gauge, which are connected to the gas source via a pipe. The gas needle is located at the fixing component and is embedded in the casing. The fixing component fixes the casing in place. When the gas source is turned on, gas is injected into the casing, and the gas pressure inside the casing is displayed on the pressure gauge.

[0004] The aforementioned patent fixes an air needle to one end of a fixed block to connect with the lithium battery box. When the height of the air hole in the lithium battery box does not correspond to the height of the air needle, the air needle cannot be connected with the air hole in the lithium battery box. At the same time, the original device does not have a filtration function and cannot filter the gas filled into the lithium battery box. Dust and other impurities can easily cause the air needle to be blocked or dust to be filled into the lithium battery box, causing pollution. Utility Model Content

[0005] To address the problems mentioned in the background section, this invention provides a sealing performance testing device for lithium battery boxes, which features the ability to easily connect the air needle to the air vent of the lithium battery box for inflation testing.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sealing performance testing device for lithium battery boxes, comprising a base plate, a connecting block fixed on one side of the upper end of the base plate, a lead screw threadedly connected to the connecting block, a movable block rotatably connected to one end of the lead screw, a fixed block fixed at the position corresponding to the movable block on the upper end of the base plate, an air pump installed on the side of the upper end of the base plate away from the connecting block, the air pump and the fixed block being connected by an air supply pipe, a pressure gauge installed on the air supply pipe, a one-way valve installed on the air supply pipe on one side of the pressure gauge, a filter assembly provided on the air supply pipe, and a docking assembly provided on the upper end of the fixed block;

[0007] The docking assembly includes a cavity. The cavity is opened inside the fixing block. A fixing pipe is fixed to the upper end of the fixing block. A connecting pipe is installed at the upper end of the fixing pipe. The connecting pipe and the fixing pipe are connected by a flange. A fixing plate is fixed to the other end of the connecting pipe. An air needle is fixed to the other end of the fixing plate.

[0008] Preferably, the docking assembly further includes a fixing seat, and a fixing seat is fixed on one side of the upper end of the fixing block, and a storage groove corresponding to the air needle is opened on the upper end of the fixing seat.

[0009] Preferably, the connecting tube is a stainless steel braided flexible tube, the air needle is threadedly connected to the fixing plate, and the lower end of the fixing tube communicates with the cavity.

[0010] Preferably, the inner wall of the storage slot is glued and fixed with a rubber pad, and the upper side of the storage slot is set with an arc-shaped structure.

[0011] Preferably, the filter assembly includes a filter box, the filter box is fixed on the air supply pipe, an mounting plate is installed at the front end of the filter box, a sealing gasket is fixed at one end of the mounting plate near the filter box, the mounting plate and the filter box are connected by fixing bolts, the front end of the filter box has fixing holes corresponding to the fixing bolts, a filter plate is provided inside the filter box, and a slot corresponding to the filter plate is provided inside the filter box.

[0012] Preferably, the mounting plate has through holes on both sides corresponding to the fixing bolts, and after the two ends of the filter plate are installed into the slots, the side of the filter plate is in close contact with the inner wall of the slot.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model, by setting a docking component, inserts the air needle at one end of the connecting tube into the air hole of the lithium battery box, thereby increasing the internal pressure of the lithium battery box. The one-way valve prevents gas backflow. After turning off the air pump, observe whether the pressure gauge changes. When the pressure gauge value changes, it indicates that the lithium battery box is not well sealed and is leaking air. Conversely, it indicates that the lithium battery box is well sealed. The docking component facilitates the inflation of the lithium battery box and avoids the inconvenience of connecting the air needle to the lithium battery box due to different air hole positions.

[0015] 2. This utility model, by setting up a filter assembly, allows the air pump to deliver air into the cavity through the air supply pipe. The gas enters the lithium battery box through the fixed pipe, connecting pipe, and air needle. During inflation, the filter plate in the filter box can filter the incoming gas, preventing dust and other impurities from entering the fixed block and the lithium battery box. By unscrewing the fixing bolts from the fixing holes, the mounting plate can be removed from the front end of the filter box, allowing the filter plate to be taken out of the slot in the filter box. This facilitates the removal, cleaning, or replacement of the filter plate. At the same time, a sealing gasket is set at one end of the mounting plate to improve the sealing between the mounting plate and the filter box after installation. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present utility model;

[0017] Figure 2 This is a sectional perspective view of the fixing block and filter box of this utility model;

[0018] Figure 3 This is a perspective view of the connecting pipe of this utility model;

[0019] Figure 4 This is a perspective view of the filter plate of this utility model during installation;

[0020] In the diagram: 1. Base plate; 2. Connecting assembly; 21. Connecting pipe; 22. Fixing pipe; 23. Cavity; 24. Flange; 25. Air needle; 26. Fixing plate; 27. Fixing seat; 28. Storage slot; 3. Filter assembly; 31. Filter box; 32. Mounting plate; 33. Filter plate; 34. Slot; 35. Sealing gasket; 36. Fixing bolt; 37. Fixing hole; 4. Pressure gauge; 5. One-way valve; 6. Air pump; 7. Air supply pipe; 8. Fixing block; 9. Moving block; 10. Lead screw; 11. Connecting block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1

[0023] Please see Figure 1-4 The present invention provides the following technical solution: a sealing performance testing device for lithium battery boxes, including a base plate 1, a connecting block 11 fixed on one side of the upper end of the base plate 1, a screw 10 threadedly connected to the connecting block 11, a movable block 9 rotatably connected to one end of the screw 10, a fixed block 8 fixed at the position corresponding to the movable block 9 at the upper end of the base plate 1, an air pump 6 installed on the side of the upper end of the base plate 1 away from the connecting block 11, the air pump 6 and the fixed block 8 connected by an air supply pipe 7, a pressure gauge 4 installed on the air supply pipe 7, a one-way valve 5 installed on the air supply pipe 7 on one side of the pressure gauge 4, a filter assembly 3 provided on the air supply pipe 7, and a docking assembly 2 provided at the upper end of the fixed block 8;

[0024] The docking assembly 2 includes a cavity 23. The cavity 23 is opened inside the fixing block 8. A fixing pipe 22 is fixed at the upper end of the fixing block 8. A connecting pipe 21 is installed at the upper end of the fixing pipe 22. The connecting pipe 21 and the fixing pipe 22 are connected by a flange 24. A fixing plate 26 is fixed at the other end of the connecting pipe 21. An air needle 25 is fixed at the other end of the fixing plate 26.

[0025] Specifically, the docking component 2 also includes a fixing seat 27. The fixing seat 27 is fixed on one side of the upper end of the fixing block 8. The upper end of the fixing seat 27 has a storage groove 28 corresponding to the air needle 25.

[0026] By adopting the above technical solution, when the air needle 25 is not in use, it can be inserted into the storage slot 28 at the upper end of the fixing base 27, so as to prevent impurities from being placed into the air needle 25 or from being stepped on and damaged.

[0027] Specifically, the connecting tube 21 is a stainless steel braided hose, the air needle 25 is threadedly connected to the fixed plate 26, and the lower end of the fixed tube 22 is connected to the cavity 23.

[0028] By adopting the above technical solution, the connecting tube 21 is a stainless steel braided flexible hose that can be bent and is easy to use, and the threaded connection between the air needle 25 and the fixed plate 26 facilitates the replacement of the air needle 25.

[0029] Specifically, the inner wall of the storage slot 28 is glued with a rubber pad, and the upper side of the storage slot 28 is designed with an arc shape.

[0030] By adopting the above technical solution, wear between the air needle 25 and the inner wall of the storage groove 28 is avoided. The upper side of the storage groove 28 is set with an arc-shaped structure to facilitate the insertion of the air needle 25 into the storage groove 28.

[0031] In this embodiment, when using the lithium battery box sealing performance testing equipment, the device is installed in a suitable position, the lithium battery box to be tested is placed on one end of the fixed block 8, the screw 10 is turned to push the movable block 9 to move and clamp and fix the lithium battery box, and then the air needle 25 at one end of the connecting pipe 21 can be inserted into the air hole of the lithium battery box to increase the internal pressure of the lithium battery box. The one-way valve 5 prevents gas backflow, the air pump 6 is turned off, and the pressure gauge 4 is observed to see if it changes. When the value of the pressure gauge 4 changes, it indicates that the lithium battery box has poor sealing and leaks air, otherwise it indicates that the lithium battery box has good sealing. The docking component 2 is set to facilitate the inflation of the lithium battery box and avoid the inconvenience of connecting the air needle to the lithium battery box due to different positions and heights of the air hole 25. When the air needle 25 is not in use, it can be inserted into the storage groove 28 at the upper end of the fixed base 27 to prevent the air needle 25 from being randomly placed with impurities or damaged by being stepped on.

[0032] Example 2

[0033] The difference between this embodiment and embodiment 1 is that: the filter assembly 3 includes a filter box 31, the filter box 31 is fixed on the air supply pipe 7, the front end of the filter box 31 is installed with an mounting plate 32, a sealing gasket 35 is fixed on one end of the mounting plate 32 near the filter box 31, the mounting plate 32 and the filter box 31 are connected by fixing bolts 36, the front end of the filter box 31 is provided with fixing holes 37 corresponding to the fixing bolts 36, the filter box 31 is provided with a filter plate 33 inside, and the filter box 31 is provided with a slot 34 corresponding to the filter plate 33 inside.

[0034] By adopting the above technical solution, the air pump 6 is turned on to send air into the cavity 23 through the air supply pipe 7. The gas enters the lithium battery box through the fixed pipe 22, the connecting pipe 21 and the air needle 25. When the gas is being filled, the filter plate 33 in the filter box 31 can filter the gas to prevent dust and other impurities from entering the fixed block 8 and the lithium battery box. The fixing bolt 36 is unscrewed from the fixing hole 37, and the mounting plate 32 can be removed from the front end of the filter box 31. The filter plate 33 can then be removed from the slot 34 in the filter box 31, which makes it easy to disassemble, clean or replace the filter plate 33. At the same time, a sealing gasket 35 is set at one end of the mounting plate 32 to make the sealing between the mounting plate 32 and the filter box 31 better after installation.

[0035] Specifically, the mounting plate 32 has through holes on both sides corresponding to the fixing bolts 36. After the filter plate 33 is installed into the slot 34 at both ends, the side of the filter plate 33 is in close contact with the inner wall of the slot 34.

[0036] By adopting the above technical solution, the fixing bolt 36 can pass through the mounting plate 32 and enter the fixing hole 37. After the two ends of the filter plate 33 are installed into the slot 34, the side of the filter plate 33 fits more closely with the inner wall of the slot 34.

[0037] In this embodiment, when the air pump 6 is turned on, air is supplied to the cavity 23 through the air supply pipe 7. The gas enters the lithium battery box through the fixed pipe 22, the connecting pipe 21 and the air needle 25. When the gas is being filled, the filter plate 33 in the filter box 31 can filter the gas to prevent dust and other impurities from entering the fixed block 8 and the lithium battery box. The fixing bolt 36 can be unscrewed from the fixing hole 37 to remove the mounting plate 32 from the front end of the filter box 31. The filter plate 33 can then be removed from the slot 34 in the filter box 31, making it easy to disassemble, clean or replace the filter plate 33. At the same time, a sealing gasket 35 is set at one end of the mounting plate 32 to improve the sealing between the mounting plate 32 and the filter box 31 after installation.

[0038] The structure and working principle of the bottom plate 1, pressure gauge 4, air pump 6, air supply pipe 7, fixing block 8, movable block 9, lead screw 10 and connecting block 11 of this utility model have been disclosed in a lithium battery casing sealing test mechanism disclosed in Chinese patent application No. 2019210156584.

[0039] The working principle and usage of this utility model are as follows: When using the sealing performance testing equipment for lithium battery boxes, install the device in a suitable position, place the lithium battery box to be tested on one end of the fixed block 8, and turn the screw 10 to push the movable block 9 to move and clamp and fix the lithium battery box. Then, insert the air needle 25 at one end of the connecting pipe 21 into the air hole of the lithium battery box to increase the internal pressure of the lithium battery box. The one-way valve 5 prevents gas backflow. Turn off the air pump 6 and observe whether the pressure gauge 4 changes. When the value of the pressure gauge 4 changes, it indicates that the lithium battery box has poor sealing and is leaking air; otherwise, it indicates that the lithium battery box has good sealing. The docking component 2 is set to facilitate the inflation of the lithium battery box and avoid the inconvenience of connecting the air needle to the lithium battery box due to different heights of the air hole 25. When the air needle 25 is not in use, it can be... Insert the air needle 25 into the storage slot 28 at the upper end of the fixing base 27 to prevent impurities from being placed in the air needle 25 or from being stepped on and damaged. Turn on the air pump 6 to send air into the cavity 23 through the air supply pipe 7. The gas enters the lithium battery box through the fixing pipe 22, the connecting pipe 21 and the air needle 25. When inflating, the filter plate 33 in the filter box 31 can filter the gas to prevent dust and other impurities from entering the fixing block 8 and the lithium battery box. Unscrew the fixing bolt 36 from the fixing hole 37 to remove the mounting plate 32 from the front end of the filter box 31. The filter plate 33 can then be removed from the slot 34 in the filter box 31, making it easy to disassemble, clean or replace the filter plate 33. At the same time, a sealing gasket 35 is set at one end of the mounting plate 32 to make the sealing between the mounting plate 32 and the filter box 31 better after installation.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing performance testing device for lithium battery boxes, comprising a base plate (1), characterized in that: A connecting block (11) is fixed on one side of the upper end of the base plate (1). A screw rod (10) is threaded into the connecting block (11). A movable block (9) is rotatably connected to one end of the screw rod (10). A fixed block (8) is fixed at the position corresponding to the movable block (9) on the upper end of the base plate (1). An air pump (6) is installed on the side of the upper end of the base plate (1) away from the connecting block (11). The air pump (6) is connected to the fixed block (8) through an air supply pipe (7). A pressure gauge (4) is installed on the air supply pipe (7). A one-way valve (5) is installed on the air supply pipe (7) on one side of the pressure gauge (4). A filter assembly (3) is provided on the air supply pipe (7). A docking assembly (2) is provided on the upper end of the fixed block (8). The docking assembly (2) includes a cavity (23). The cavity (23) is opened inside the fixing block (8). A fixing pipe (22) is fixed at the upper end of the fixing block (8). A connecting pipe (21) is installed at the upper end of the fixing pipe (22). The connecting pipe (21) and the fixing pipe (22) are connected by a flange (24). A fixing plate (26) is fixed at the other end of the connecting pipe (21). An air needle (25) is fixed at the other end of the fixing plate (26).

2. The sealing performance testing equipment for lithium battery boxes according to claim 1, characterized in that: The docking assembly (2) also includes a fixing seat (27). The fixing seat (27) is fixed on one side of the upper end of the fixing block (8). The upper end of the fixing seat (27) is provided with a storage groove (28) corresponding to the air needle (25).

3. The sealing performance testing equipment for lithium battery boxes according to claim 1, characterized in that: The connecting tube (21) is a stainless steel braided hose, the air needle (25) is threadedly connected to the fixed plate (26), and the lower end of the fixed tube (22) is connected to the cavity (23).

4. The sealing performance testing equipment for lithium battery boxes according to claim 2, characterized in that: The inner wall of the storage groove (28) is fixed with a rubber pad by adhesive, and the upper side of the storage groove (28) is set with an arc-shaped structure.

5. The sealing performance testing equipment for lithium battery boxes according to claim 1, characterized in that: The filter assembly (3) includes a filter box (31), the filter box (31) is fixed on the air supply pipe (7), the front end of the filter box (31) is equipped with an installation plate (32), the end of the installation plate (32) near the filter box (31) is fixed with a sealing gasket (35), the installation plate (32) and the filter box (31) are connected by fixing bolts (36), the front end of the filter box (31) is provided with fixing holes (37) corresponding to the fixing bolts (36), the filter box (31) is provided with a filter plate (33) inside, and the filter box (31) is provided with a slot (34) corresponding to the filter plate (33) inside.

6. The sealing performance testing equipment for lithium battery boxes according to claim 5, characterized in that: The mounting plate (32) has through holes on both sides corresponding to the fixing bolts (36). After the filter plate (33) is installed into the slot (34) at both ends, the side of the filter plate (33) is in close contact with the inner wall of the slot (34).

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