Battery pack air tightness detection tool

Abstract

The utility model discloses a battery pack air tightness detection tool, which is used for being matched with a clamping anti-explosion valve and comprises a shell pipe body, a sealing pipe body and an inflation pipe body which are sequentially sleeved from outside to inside, a drag hook is arranged at the first end of the shell tube body; the first end of the sealing pipe body is provided with a first sealing ring structure, a boss and a first ventilation groove, the end face of the first end of the sealing pipe body serves as a reference face, and a preset height difference exists between the boss and the first sealing ring structure; the first end of the inflation pipe body is provided with a second ventilation groove, the second ventilation groove is communicated with an inflation pipeline of the inflation pipe body and the first ventilation groove, and the first end of the inflation pipe body is provided with a magnet. The battery pack air tightness detection tool provided by the utility model is suitable for being matched with the clamping anti-explosion valve, and when the air tightness of the battery pack is detected, the situation that the valve core of the clamping anti-explosion valve is excessively pulled out and cannot be reset after being clamped is prevented.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a tooling for testing the airtightness of a battery pack. Background Technology

[0002] In existing technology, battery pack housings are equipped with explosion-proof valves. The valve core opens when thermal runaway occurs inside the battery pack to release high-pressure gas and prevent explosion. However, the valve core of existing explosion-proof valves can repeatedly open and close, which may prevent the timely discharge of high-temperature, high-pressure gas generated by thermal runaway in individual cells, potentially leading to thermal runaway in more cells. Therefore, check valves with a locking mechanism after the valve core opens have been adopted. However, with existing airtightness testing fixtures, the valve core may exceed its reset stroke and become stuck, rendering the installed explosion-proof valve unusable. Therefore, a new battery pack airtightness testing fixture for check valves is needed. Utility Model Content

[0003] This utility model provides a battery pack airtightness testing fixture to solve the problem that existing battery pack airtightness testing fixtures cannot be applied to check valves and explosion-proof valves.

[0004] This utility model provides a battery pack airtightness testing fixture for use with a locking explosion-proof valve. It includes an outer shell tube, a sealing tube, and an inflation tube, sequentially arranged from the outside to the inside. The outer shell tube, the sealing tube, and the inflation tube are coaxially arranged, and the outer shell tube and the sealing tube are slidable relative to each other. A hook is provided at the first end of the outer shell tube. The first end of the sealing tube has a first sealing ring structure, a boss, and a first venting groove. The sealing ring surrounds the boss. With the end face of the first end of the sealing tube as a reference surface, the height of the boss is less than the height of the first sealing ring structure, and there is a preset height difference between the boss and the first sealing ring structure. The first end of the inflation tube has a second venting groove, which communicates with the inflation pipe of the inflation tube and the first venting groove. A magnet is provided at the first end of the inflation tube, which can attract the valve core of the explosion-proof valve.

[0005] In one embodiment, a first rotating handle is further included. The first rotating handle is sleeved on the inflation tube and can slide relative to the inflation tube. It is threadedly engaged with the second end of the outer casing tube. The end of the first rotating handle can abut against the second end of the sealing tube and can drive the outer casing tube to slide relative to the sealing tube.

[0006] In one embodiment, a second rotating handle is further included. The second rotating handle is sleeved on the inflation tube and can move relative to the inflation tube. The inflation tube is threadedly engaged. The second rotating handle can abut against the first rotating handle and can drive the inflation tube to slide relative to the sealing tube.

[0007] In one embodiment, the first end of the outer casing has a flange edge, and the hooks are disposed on the flange edge and spaced apart circumferentially along the flange edge. The hooks include a pull plate and a protrusion. The pull plate extends from the flange edge along the axial direction of the outer casing, and the protrusion extends from the free end of the pull plate toward the axial direction of the outer casing along the radial direction of the outer casing.

[0008] In one embodiment, the first sealing ring structure includes a first groove and a first sealing ring. The first groove is located at the edge of the first end face of the sealing tube body, and the first sealing ring is located in the first groove. The first groove includes a first wall. With the end face of the first end of the sealing tube body as a reference surface, the height of the boss is less than the height of the first wall, and the boss and the first wall have a preset height difference.

[0009] In one embodiment, a magnet mounting groove is provided at the first end of the inflation tube, the magnet is fixed in the magnet mounting groove, and the second ventilation groove extends through the magnet mounting groove along the radial direction of the inflation tube, with the bottom surface of the magnet mounting groove being higher than the bottom surface of the second ventilation groove.

[0010] In one embodiment, a strip-shaped guide hole is provided on the wall of the outer casing tube, the length of the strip-shaped guide hole extends along the axial direction of the outer casing tube, and a first positioning hole is provided on the wall of the sealing tube, and a first limiting screw passes through the strip-shaped guide hole and is fixed in the first positioning hole.

[0011] In one embodiment, a second groove is provided on the inner wall of the sealing tube near the first end of the sealing tube, and a second sealing ring is disposed in the second groove.

[0012] In one embodiment, a third groove is provided on the inner wall of the sealing tube near the second end of the sealing tube, and a third sealing ring is disposed in the third groove.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] The battery pack airtightness testing fixture provided in this embodiment is suitable for use with a locking explosion-proof valve. During battery pack airtightness testing, it prevents the valve core of the locking explosion-proof valve from being pulled out excessively and becoming stuck and unable to reset. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of a battery pack airtightness testing fixture provided in an embodiment of the present invention;

[0016] Figure 2 This is a three-dimensional structural schematic diagram of a battery pack airtightness testing fixture provided in an embodiment of the present invention;

[0017] Figure 3 This is a cross-sectional structural schematic diagram of a battery pack airtightness testing fixture provided in an embodiment of the present invention.

[0018] Attached image annotations:

[0019] 100. Battery Pack Airtightness Testing Fixture; 1. Outer Shell Tube; 11. Hook; 111. Pull Plate; 112. Protruding Hook; 12. Flange Edge; 13. Strip Guide Hole; 2. Sealing Tube; 21. First Sealing Ring Structure; 211. First Groove; 2111. First Wall; 212. First Sealing Ring; 22. Boss; 23. First Ventilation Groove; 24. First Positioning Hole; 25. Second Positioning Hole; 26. Second Groove; 27. Second Sealing Ring; 28. Third Groove; 29. ​​Third Sealing Ring; 3. Inflation Tube; 31. Second Ventilation Groove; 32. Magnet; 33. Magnet Mounting Groove; 34. Strip Guide Groove; 4. First Rotating Handle; 5. Second Rotating Handle; 6. First Limit Screw; 7. Second Limit Screw. Detailed Implementation

[0020] Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] See Figure 1-2As shown in the illustration, this utility model discloses a battery pack airtightness testing fixture 100, used in conjunction with a locking explosion-proof valve to test the airtightness of the battery pack. It includes an outer shell tube 1, a sealing tube 2, and an inflation tube 3, sequentially arranged from the outside to the inside, all coaxially arranged. The outer shell tube 1 and the sealing tube 2 can slide relative to each other, as can the inflation tube 3 and the sealing tube 2. A hook 11 is provided at the first end of the outer shell tube 1, used to engage with a groove on the side wall of the locking explosion-proof valve housing to hook onto the housing of the locking explosion-proof valve. The first end of the sealing tube 2 is provided with a first sealing ring structure 21, a boss 22, and a first venting groove 23. The first sealing ring structure 21 is located at the edge of the first end face of the sealing tube 2, the boss 22 is located near the center of the first end face of the sealing tube 2, the first sealing ring structure 21 surrounds the boss 22, and the first venting groove 23 is located between the first sealing ring structure 21 and the boss 22. With the first end face of the sealing tube 2 as the reference plane, the height of the boss 22 is less than the height of the first sealing ring structure 21, wherein a predetermined height difference is set between the boss 22 and the first sealing ring structure 21. A second venting groove 31 is provided at the first end of the inflation tube 3, and the second venting groove 31 communicates with the first venting groove 23. A magnet 32 ​​is provided at the first end of the inflation tube 3, and the magnet 32 ​​can attract and lock the end cap of the explosion-proof valve core.

[0022] During the battery pack airtightness test, the hook 11 at the first end of the outer casing tube 1 is hooked into the groove on the side wall of the explosion-proof casing. The sealing tube 2 is pushed towards the explosion-proof valve and tightly abuts against it. The first sealing ring structure 21 seals the edge of the explosion-proof valve housing. Then, the inflation tube 3 is pushed towards the explosion-proof valve, and the magnet 32 ​​contacts and attracts the valve core of the explosion-proof valve. Then, the inflation tube 3 is pulled back away from the explosion-proof valve, pulling up the valve core of the explosion-proof valve. Finally, the inflation tube 3 is pushed from the other end of the inflation tube 3. Test gas is injected into the battery pack and pressurized to test the overall airtightness of the battery pack. Since the first end of the sealing tube 2 is provided with a boss 22 and the boss 22 and the first sealing structure 21 have a preset height difference, which is less than the locking stroke of the valve core of the locking explosion-proof valve, after the valve core of the locking explosion-proof valve is pulled up, it will not exceed the locking stroke due to the limit of the boss 22. Therefore, the valve core of the locking explosion-proof valve will not be scrapped during the airtightness test of the battery pack.

[0023] Furthermore, in the above embodiment, the battery pack airtightness testing fixture 100 also includes a first rotating handle 4. The first rotating handle 4 is sleeved on the inflation tube 3 and can slide relative to the inflation tube 3. The end of the first rotating handle 4 can abut against the second end of the sealing tube 2. The first rotating handle 4 is threadedly engaged with the second end of the outer shell tube 1. Rotating the first rotating handle 4 can drive the outer shell tube 1 to slide relative to the sealing tube 2. Specifically, the inner peripheral wall of the second end of the outer shell tube 1 is provided with threads, and the outer peripheral wall of the first rotating handle 4 is provided with threads. The hook 11 of the outer shell tube 1 hooks and locks the explosion-proof valve. After the outer shell is removed, the sealing tube 2 is pushed to abut against the outer shell of the explosion-proof valve. The first sealing ring structure 21 at the first end of the sealing tube 2 abuts against the end face of the explosion-proof valve outer shell. The first rotating handle 4 is rotated to approach the sealing tube 2 and abut against the second end of the sealing tube 2. The first rotating handle 4 is rotated again. Through the threaded engagement, the outer shell tube 1 and the sealing tube 2 are driven to slide relative to each other. Since the hook 11 of the outer shell tube 1 hooks the outer shell of the explosion-proof valve, the rotating handle 4 pushes the sealing tube 2 toward the end face of the explosion-proof outer shell, so that the first sealing ring structure 21 tightly abuts against the end face of the explosion-proof valve outer shell, thus achieving a sealing effect.

[0024] Furthermore, in the above embodiment, the battery pack airtightness testing fixture 100 also includes a second rotating handle 5. The second rotating handle 5 is sleeved on the inflation tube 3, threadedly engaged with the inflation tube 3, and moves relative to the inflation tube 3. The end of the second rotating handle 5 can abut against the first rotating handle 4 and drive the inflation tube 3 to move relative to the sealing tube 2. Specifically, the outer peripheral wall of the inflation tube 3 is provided with threads, and the inner peripheral wall of the second rotating handle 5 is provided with threads. After the first rotating handle 4 is rotated into place and the first sealing structure 21 seals with the end face of the explosion-proof valve housing, the inflation tube 3 is pushed against the sealing tube 2. The valve core of the explosion-proof valve is engaged by magnet 32. The second rotating handle 5 is rotated to approach and abut against the first rotating handle 4. The second rotating handle 5 is rotated further. Since the second rotating handle 5 has abutted against the first rotating handle 4, the inflation tube 4 is driven away from the explosion-proof valve, thereby pulling up the valve core that is engaged to prevent explosion. Through the threaded fit and the setting of the thread pitch, rotating the second rotating handle 5 can slowly pull up the valve core of the explosion-proof valve, avoiding exceeding the pull-out distance when pulling up the valve core too quickly. After the valve core is disengaged from magnet 32, it resets, which is convenient for operation and saves time.

[0025] In one embodiment, the first end of the outer casing 1 has a flange edge 12, and two hooks 11 are provided circumferentially spaced along the flange edge 12. Each hook 11 includes a pull plate 111 and a protrusion 112. The pull plate 111 extends from the flange edge 12 along the axial direction of the outer casing 1, and the protrusion 112 protrudes from the free end of the pull plate 111 toward the axial direction of the outer casing 1 along the radial direction of the outer casing 1. The two hooks 11 form an opening at intervals, and the protrusion 112 facilitates entry from the side of the explosion-proof valve into the groove on the side wall of the explosion-proof valve housing.

[0026] In one embodiment, the first sealing ring structure 21 includes a first groove 211 and a first sealing ring 212. The first groove 211 is located at the edge of the first end face of the sealing tube 2, and the first sealing ring 212 is located in the first groove 211. The first groove 211 includes a first wall 2111. With the first end face of the sealing tube 2 as the reference surface, the height of the boss 22 is less than the height of the first wall 2111. The height difference between the boss 22 and the first wall 2111 is set to not exceed the opening stroke of the valve core of the locking explosion-proof valve. Thus, when the valve core is pulled out, the end face of the first wall 2111 abuts against the end face of the outer shell of the locking explosion-proof valve, and the boss 22 limits the distance the valve core is pulled up to not exceed the locking stroke of the valve core, thereby preventing the locking explosion-proof valve from being scrapped during battery pack airtightness testing.

[0027] In one embodiment, a magnet mounting groove 33 is provided at the first end of the inflation tube 3, and a 32 is fixed in the magnet mounting groove 33, wherein the magnet mounting groove 33 is formed by an indentation at the center of the first end face of the inflation tube 3. A second venting groove 31 is provided at the first end of the inflation tube 3, the second venting groove 31 is indented from the first end face of the inflation tube 3 and penetrates the inflation tube 3 radially. In the axial direction of the inflation tube 3, the bottom surface of the magnet mounting groove 33 is higher than the bottom surface of the second venting groove 31, and the position of the second venting groove 31 is aligned with the first venting groove 23, thereby forming an inflation passage connecting the second venting groove 31 and the first venting groove 23 through the inflation channel of the inflation tube 3.

[0028] In one embodiment, a strip-shaped guide hole 13 is provided on the wall of the outer casing tube 1, and the length of the strip-shaped guide hole 13 extends along the circumferential direction of the outer casing tube 1. A first positioning hole 24 is provided on the wall of the sealing tube 2, and a first limiting screw 6 passes through the strip-shaped guide hole 13 and is fixed in the first positioning hole 24. By setting the strip-shaped guide hole 13 and the first limiting screw 6, the relative sliding distance between the outer casing tube 1 and the sealing tube 2 along the axial direction is limited, preventing the relative rotation between the outer casing tube 1 and the sealing tube 2 from affecting the airtightness and improving the reliability of the battery pack airtightness test.

[0029] In one embodiment, a second positioning hole 25 is provided on the wall of the sealing tube 2, and a strip-shaped guide groove 34 is provided on the wall of the inflation tube 3. The length of the strip-shaped guide groove 34 extends along the axial direction of the inflation tube 3. A second limiting screw 7 is fixed in the second positioning hole 25 and extends into the strip-shaped guide groove 34. By setting the strip-shaped guide groove 34 and the second limiting screw 7, the sealing tube 2 and the inflation tube 3 are limited to sliding relative to each other only along the axial direction, preventing relative rotation between the sealing tube 2 and the inflation tube 3 from affecting the airtightness and improving the reliability of airtightness detection.

[0030] In one embodiment, a second groove 26 is provided on the inner wall of the sealing tube 2 near the first end of the sealing tube 2, and a second sealing ring 27 is disposed in the second groove 26, wherein the second groove 26 is annular and the second sealing ring 27 is an annular sealing ring. Further, in the above embodiment, a third groove 28 is provided on the inner wall of the sealing tube 2 near the second end of the sealing tube 2, and a third sealing ring 29 is disposed in the third groove 28, wherein the third groove 28 is annular and the third sealing ring 29 is an annular sealing ring. The placement of the second sealing ring 27 and the third sealing ring 29 does not affect the phase sliding between the inflation tube 3 and the sealing tube 2. The placement of the second sealing ring 27 and the third sealing ring 29 enhances the airtightness between the inflation tube 3 and the sealing tube 2, improving the reliability of battery pack airtightness testing.

[0031] This invention can achieve at least the following beneficial effects:

[0032] The end of the sealing tube 2 is provided with a limiting boss 22, which can limit the valve core of the explosion-proof valve from exceeding the reset stroke. When the battery pack airtightness test is carried out, it prevents the valve core of the explosion-proof valve from being pulled out excessively and becoming stuck and unable to reset, thus causing the explosion-proof valve to be scrapped and avoiding the loss caused by the replacement and maintenance of the explosion-proof valve.

[0033] It should be noted that although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A battery pack airtightness testing fixture, used in conjunction with a locking explosion-proof valve, characterized in that, include: The outer shell tube, sealing tube, and inflation tube are sequentially nested from the outside in. The outer shell tube, sealing tube, and inflation tube are coaxially arranged, and the outer shell tube and sealing tube can slide relative to each other. The inflation tube and sealing tube can also slide relative to each other. A hook is provided at the first end of the outer shell tube. The first end of the sealing tube has a first sealing ring structure, a boss, and a first venting groove. The sealing ring surrounds the boss. Using the end face of the first end of the sealing tube as a reference plane, the height of the boss is less than the height of the first sealing ring structure, and there is a preset height difference between the boss and the first sealing ring structure. The first end of the inflation tube has a second venting groove, which communicates with the inflation pipe of the inflation tube and the first venting groove. A magnet is provided at the first end of the inflation tube, and the magnet can attract the valve core of the explosion-proof valve.

2. The battery pack airtightness testing fixture according to claim 1, characterized in that, It also includes a first rotating handle, which is sleeved on the inflation tube and can slide relative to the inflation tube. It is threadedly engaged with the second end of the outer shell tube. The end of the first rotating handle can abut against the second end of the sealing tube and can drive the outer shell tube to slide relative to the sealing tube.

3. The battery pack airtightness testing fixture according to claim 2, characterized in that, It also includes a second rotating handle, which is sleeved on the inflation tube and can move relative to the inflation tube. The inflation tube is threadedly engaged, and the second rotating handle can abut against the first rotating handle and drive the inflation tube to slide relative to the sealing tube.

4. The battery pack airtightness testing fixture according to claim 1, characterized in that, The first end of the outer casing has a flange edge, and the pull hooks are disposed on the flange edge and spaced apart circumferentially along the flange edge. The pull hooks include a pull plate and a protruding hook. The pull plate extends from the flange edge along the axial direction of the outer casing, and the protruding hook protrudes from the free end of the pull plate toward the axial direction of the outer casing along the radial direction of the outer casing.

5. The battery pack airtightness testing fixture according to claim 1, characterized in that, The first sealing ring structure includes a first groove and a first sealing ring. The first groove is located at the edge of the first end face of the sealing tube body. The first sealing ring is located in the first groove. The first groove includes a first wall. With the end face of the first end of the sealing tube body as the reference surface, the height of the boss is less than the height of the first wall. The boss and the first wall have a preset height difference.

6. The battery pack airtightness testing fixture according to claim 1, characterized in that, The first end of the inflation tube is provided with a magnet mounting groove, and the magnet is fixed in the magnet mounting groove. The second ventilation groove passes through the magnet mounting groove along the radial direction of the inflation tube, and the bottom surface of the magnet mounting groove is higher than the bottom surface of the second ventilation groove.

7. The battery pack airtightness testing fixture according to claim 1, characterized in that, A strip-shaped guide hole is provided on the wall of the outer casing tube, the length of which extends along the axial direction of the outer casing tube. A first positioning hole is provided on the wall of the sealing tube, and a first limiting screw passes through the strip-shaped guide hole and is fixed in the first positioning hole.

8. The battery pack airtightness testing fixture according to claim 7, characterized in that, The sealing tube has a second positioning hole on its wall and the inflation tube has a strip guide groove on its wall. The length of the strip guide groove extends along the axial direction of the inflation tube. The second limiting screw is fixed in the second positioning hole and extends into the strip guide groove.

9. The battery pack airtightness testing fixture according to claim 1, characterized in that, A second groove is provided on the inner wall of the sealing tube near the first end of the sealing tube, and a second sealing ring is disposed in the second groove.

10. The battery pack airtightness testing fixture according to claim 9, characterized in that, A third groove is provided on the inner wall of the sealing tube near the second end of the sealing tube, and a third sealing ring is disposed in the third groove.

Images