A needle puncture test fixture base

Abstract

The present application relates to the technical field of battery puncture test, and specifically discloses a puncture test fixture base, including a connecting seat, an electromagnet and an oblique well are provided on the connecting seat, the oblique well contacts the side wall of the electromagnet, a connecting cylinder is provided on the electromagnet, a first clamping groove is provided on one side of the connecting cylinder, a connecting column is inserted in the connecting cylinder, a second clamping groove is provided on one side of the connecting column, the first clamping groove and the second clamping groove are connected, a clamping piece is provided in the second clamping groove, a cylinder is provided on one side of the oblique well, the output shaft of the cylinder passes through the oblique well, a clamping block is connected to the output shaft of the cylinder, the clamping block is inserted in the first clamping groove, a third clamping groove is provided on the clamping block, the clamping piece is inserted in the third clamping groove, and a chuck is connected to the connecting column. The present application has the effect of meeting the needs of the battery pack bottom puncture test and improving the test efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of battery puncture test, and in particular to a puncture test fixture base. Background Art

[0002] Batteries are the core components of new energy vehicles, and their safety performance is related to the reliability of the entire vehicle and the safety of users. Among them, lithium-ion batteries are widely used due to their high energy density, but under the conditions of collision, extrusion or puncture, the battery is prone to diaphragm rupture, positive and negative short circuits and other faults, causing thermal runaway and leading to fire and explosion. Therefore, reliability testing of batteries is a key link before new energy vehicles leave the factory.

[0003] The needle penetration test is a common battery safety performance testing method. By piercing the battery with a steel needle to trigger an internal short circuit, it can effectively evaluate the battery's ability to suppress thermal runaway and the effectiveness of the protection design. Traditional needle penetration test equipment is mostly designed for vertical puncture on the side or top of the battery, which is difficult to adapt to the special needs of the bottom test of the battery pack. In addition, the mode is single and cannot be compatible with various post-processing needs, resulting in reduced efficiency of the needle penetration test.

[0004] Therefore, there is an urgent need to provide a device that can be used for the battery pack bottom puncture test, which can accurately simulate the bottom puncture and provide an optional post-processing solution to improve the test efficiency. Summary of the invention

[0005] In order to meet the requirements of the battery pack bottom puncture test and improve the test efficiency, the present application provides a puncture test fixture base, which adopts the following technical solutions:

[0006] A needle puncture test fixture base comprises a connecting seat, an electromagnet and an oblique well are provided on the connecting seat, the oblique well contacts the side wall of the electromagnet, a connecting tube is provided on the electromagnet, a first clamping groove is provided on one side of the connecting tube, a connecting column is inserted in the connecting tube, a second clamping groove is provided on one side of the connecting column, the first clamping groove and the second clamping groove are connected, a clamping piece is provided in the second clamping groove, a cylinder is provided on one side of the oblique well, the output shaft of the cylinder passes through the oblique well, a clamping block is connected to the output shaft of the cylinder, the clamping block is inserted in the first clamping groove, a third clamping groove is provided on the clamping block, the clamping piece is inserted in the third clamping groove, and a chuck is connected to the connecting column.

[0007] By adopting the above technical solution, when performing a bottom puncture test on a new energy vehicle battery pack, a chuck is used to clamp a steel needle, and the electromagnet is energized to fix the position of the inclined well and the connecting tube, and the cylinder is started to push the clamping block into the first clamping groove, and the clamping piece is inserted into the third clamping groove, thereby locking the clamping block, the connecting column and the connecting tube, and the connecting seat rises, so that the steel needle is inserted into the battery pack;

[0008] If the steel needle needs to be pulled out, the connecting seat is directly lowered; if the steel needle needs to be left in the battery pack for further observation, the cylinder can be started to separate the clamping block from the connecting tube, and then the connecting seat is lowered. The chuck and the connecting column will remain under the battery pack together with the steel needle, making the post-processing plan of the puncture test selectable, thereby improving the test efficiency.

[0009] Optionally, the chuck and the connecting tube are connected via a second base, a mounting ring is provided on the second base, a protective cover is provided on the mounting ring, and the protective cover is umbrella-shaped.

[0010] By adopting the above technical solution, the protective cover can effectively protect the components below the chuck, reduce the possibility of thermal expansion and contraction of the equipment, and facilitate cleaning of debris and residual liquid after the test.

[0011] Optionally, the protective cover includes a plurality of umbrella plates and connecting plates, the umbrella plates are arranged around the axis of the mounting ring, and adjacent umbrella plates are connected by connecting plates.

[0012] Optionally, a first base is provided between the connecting tube and the electromagnet, the first base is fixed to the connecting tube, a latch is provided on the first base, and the latch is plugged into the electromagnet.

[0013] Optionally, a vertical launch well is provided on the connecting seat, and the side wall of the vertical launch well conflicts with the side wall of the oblique launch well. The electromagnet is located between the vertical launch well and the oblique launch well, and the side wall of the electromagnet conflicts with the inner wall of the vertical launch well.

[0014] Optionally, a limit slot is provided on the vertical launch shaft, a limit block is fixed on one side of the electromagnet, and the limit block is located in the limit slot.

[0015] By adopting the above technical solution, the setting of the limit groove and the limit block makes the connection between the vertical launch shaft and the connecting seat more stable.

[0016] Optionally, a connecting block is provided on the connecting seat, a torsion groove is opened on the inclined launch shaft, and the connecting block is located in the torsion groove.

[0017] Optionally, the connecting block is connected to the inclined launch well through a torsion spring, and when the bottom of the inclined launch well is in full contact with the connecting seat, the torsion spring is in a natural state.

[0018] By adopting the above technical solution, when the steel needle is too long, an escape state can be adopted. After the needle is pulled out, the electromagnet is powered off. In the process of pulling the connecting seat, the steel needle encounters an obstacle, and the oblique well flips a certain angle to avoid danger. After the escape is completed, the oblique well can be reset under the action of the tension spring, so that the test efficiency of the needle puncture test is further improved. While accurately simulating bottom puncture, an optional post-processing solution is provided, which can be flexibly applied to different scenarios.

[0019] Optionally, a third accommodating groove is opened on the vertical launch shaft, and a second reset rod is arranged in the third accommodating groove. The second reset rod is fixedly connected to the connecting seat, and a spring is sleeved on the second reset rod. One end of the spring is connected to the second reset rod, and the other end of the spring is connected to the bottom of the third accommodating groove.

[0020] By adopting the above technical solution, when the steel needle is too long, an escape state can be adopted. After the needle is pulled out, the electromagnet is powered off. In the process of pulling the connecting seat, the steel needle encounters an obstacle, and the oblique launch well flips over a certain angle to avoid danger. The vertical launch well rises under the lifting of the limit block. After the escape is completed, the vertical launch well can be reset under the action of the spring, so that the test efficiency of the needle puncture test is further improved. While accurately simulating bottom puncture, an optional post-processing solution is provided, which can be flexibly applied to different scenarios.

[0021] Optionally, a first accommodating groove is formed on the connecting seat, a first reset rod is fixed in the first accommodating groove, and the first reset rod is fixedly connected to the second reset rod.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. If the steel needle needs to be pulled out, the connection seat is directly lowered; if the steel needle needs to be left in the battery pack for further observation, the cylinder can be started to separate the clamping block from the connection tube, and then the connection seat is lowered, so that the chuck and the connection column are left under the battery pack together with the steel needle, so that the post-processing scheme of the needle penetration test can be selected, which improves the test efficiency;

[0024] 2. When the steel needle is too long, the escape state can be adopted. After the needle is pulled out, the electromagnet is powered off. In the process of pulling the connecting seat, the steel needle encounters an obstacle, and the oblique well is flipped to a certain angle to avoid danger. After the escape, the oblique well can be reset under the action of the tension spring, so that the test efficiency of the needle puncture test is further improved. While accurately simulating the bottom puncture, it provides an optional post-processing solution, which can be flexibly applied to different scenarios;

[0025] 3. When the steel needle is too long, the escape state can be adopted. After the needle is pulled out, the electromagnet is powered off. In the process of pulling the connecting seat, the steel needle encounters an obstacle, and the oblique launch well flips over a certain angle to avoid danger. The vertical launch well rises under the lifting of the limit block. After the escape is completed, the vertical launch well can be reset under the action of the spring, so that the test efficiency of the needle puncture test is further improved. While accurately simulating the bottom puncture, it provides optional post-processing solutions and can be flexibly applied to different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a needle puncture test fixture base in an embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the structure of the connecting seat, the mounting block and the connecting block in the embodiment of the present application.

[0028] Figure 3 It is a top view of a base of a needle puncture test fixture in an embodiment of the present application.

[0029] Figure 4 is along Figure 3 Cross-sectional view along the AA direction.

[0030] Figure 5 It is a structural schematic diagram of the first base, the connecting tube, the second base, the connecting column and the clamping block in the embodiment of the present application.

[0031] Figure 6 It is a schematic diagram of the structure of the vertical launch shaft in the embodiment of the present application.

[0032] Figure 7 is along Figure 3 Cross-sectional view along the BB direction.

[0033] Figure 8 is along Figure 3 Cross-sectional view along CC direction.

[0034] Fig. 9 It is a schematic diagram of the structure of the oblique launch well in an embodiment of the present application.

[0035] Fig.10 It is a structural schematic diagram of a needle puncture test fixture base during escape according to an embodiment of the present application.

[0036] Description of the accompanying drawings: 1, connecting seat; 2, mounting block; 3, mounting groove; 4, first accommodating groove; 5, connecting block; 6, connecting groove; 7, electromagnet; 8, first base; 9, connecting tube; 10, second base; 11, protective cover; 12, mounting ring; 13, chuck; 14, limit block; 15, latch; 16, first clamping groove; 17, connecting column; 18, second clamping groove; 19, clamping piece; 20, connecting platform; 21, plug-in block; 22, umbrella plate ; 23. Connecting plate; 24. Overlap groove; 25. Vertical launch well; 26. Oblique launch well; 27. First assembly groove; 28. Second assembly groove; 29. ​​Limiting groove; 30. Second accommodating groove; 31. Third accommodating groove; 32. First reset rod; 33. Second reset rod; 34. Reset block; 35. Spring; 36. Third assembly groove; 37. Fourth assembly groove; 38. Connecting groove; 39. Cylinder; 40. Clamping block; 41. Third clamping groove; 42. Torsion groove. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-10 This application is described in further detail.

[0038] Example

[0039] The embodiment of the present application discloses a needle puncture test fixture base.

[0040] Reference Figure 1 and Figure 2 A needle puncture test fixture base includes a connecting seat 1, the cross section of the connecting seat 1 is circular. A mounting block 2 is provided at the bottom of the connecting seat 1, the mounting block 2 is a cylinder, the axis of the mounting block 2 coincides with the axis of the connecting seat 1, and the mounting block 2 and the connecting seat 1 are integrally formed.

[0041] Reference Figure 2 , a mounting groove 3 is provided on the connecting seat 1, the mounting groove 3 opens upward, the cross section of the mounting groove 3 is circular, and the axis of the mounting groove 3 coincides with the axis of the connecting seat 1. Two first accommodating grooves 4 are provided on the connecting seat 1, the first accommodating grooves 4 are through grooves in the vertical direction, the cross section of the first accommodating grooves 4 is circular, and there is a gap between the first accommodating grooves 4 and the mounting grooves 3. Two connecting blocks 5 are provided on the side of the connecting seat 1 away from the first accommodating grooves 4, and there is a gap between the two connecting blocks 5. The edge of the connecting block 5 is arranged in an arc shape, and the curvature of the edge of the connecting block 5 is consistent with the curvature of the edge of the connecting seat 1, and the connecting block 5 is integrally formed with the connecting seat 1. A connecting groove 6 is provided on the connecting block 5, and the connecting groove 6 is a through groove in the horizontal direction. The connecting grooves 6 on the two connecting blocks 5 are coaxially arranged.

[0042] Reference Figure 3 and Figure 4, the connection seat 1 is provided with an electromagnet 7, a first base 8, a connection tube 9, a second base 10, a protective cover 11, a mounting ring 12 and a chuck 13 from bottom to top. The electromagnet 7 is located in the mounting groove 3, the bottom of the electromagnet 7 is in conflict with the bottom of the mounting groove 3, and the axis of the electromagnet 7 coincides with the axis of the mounting groove 3. A stop block 14 is provided on one side of the electromagnet 7, the stop block 14 is a cylinder, the longitudinal section of the stop block 14 is circular, and the stop block 14 is integrally formed with the electromagnet 7.

[0043] Reference Figure 4 and Figure 5 The first base 8 is a cylinder, the first base 8 is coaxially arranged with the electromagnet 7, the radius of the cross section of the first base 8 is equal to the radius of the cross section of the electromagnet 7, and the first base 8 is in conflict with the top of the electromagnet 7. A latch 15 is provided at the bottom of the first base 8, the latch 15 is coaxially arranged with the first base 8, the latch 15 is integrally formed with the first base 8, and the latch 15 passes through the top of the electromagnet 7.

[0044] Reference Figure 4 and Figure 5 The connecting tube 9 is a hollow cylinder, and the cross section of the connecting tube 9 is a circular ring. The connecting tube 9 is coaxially arranged with the first base 8, and the radius of the cross section of the connecting tube 9 is smaller than the radius of the cross section of the first base 8, and the connecting tube 9 and the first base 8 are integrally formed. A first clamping groove 16 is provided on one side of the connecting tube 9, and the longitudinal section of the first clamping groove 16 is a trapezoid, and the groove bottom of the first clamping groove 16 is inclined downward away from the side of the axis of the connecting tube 9, and the first clamping groove 16 is connected with the interior of the connecting tube 9.

[0045] Reference Figure 4 and Figure 5 The second base 10 is a cylinder, the second base 10 is coaxially arranged with the connecting tube 9, and the radius of the cross section of the second base 10 is greater than the radius of the cross section of the connecting tube 9. A connecting column 17 is provided at the bottom of the second base 10, the connecting column 17 is a cylinder, the connecting column 17 is coaxially arranged with the second base 10, and the connecting column 17 and the second base 10 are integrally formed. The connecting column 17 is inserted into the connecting tube 9, the side wall of the connecting column 17 conflicts with the inner wall of the connecting tube 9, and the bottom of the connecting column 17 conflicts with the top of the first base 8.

[0046] Reference Figure 5A second snap-in groove 18 is provided on one side of the connecting column 17. The longitudinal section of the second snap-in groove 18 is a trapezoid. The bottom of the second snap-in groove 18 is inclined downward on the side away from the axis of the connecting column 17. The second snap-in groove 18 is connected to the first snap-in groove 16. The longitudinal section of the groove formed by the first snap-in groove 16 and the second snap-in groove 18 is a complete trapezoid. A snap-in piece 19 is provided in the second snap-in groove 18. The longitudinal section of the snap-in piece 19 is a trapezoid. The top edge of the snap-in piece 19 coincides with the top of the second snap-in groove 18, the bottom edge of the snap-in piece 19 coincides with the bottom of the second snap-in groove 18, and the side wall edge of the snap-in piece 19 coincides with the side wall of the second snap-in groove 18. The snap-in piece 19 is integrally formed with the connecting column 17.

[0047] Reference Figure 4 and Figure 5 A connecting platform 20 is provided on the top of the second base 10. The connecting platform 20 is a cylinder. The connecting platform 20 is coaxially arranged with the second base 10. The radius of the cross section of the connecting platform 20 is smaller than the radius of the cross section of the second base 10. The connecting platform 20 and the second base 10 are integrally formed. The mounting ring 12 is sleeved on the connecting platform 20. The mounting ring 12 and the connecting platform 20 are coaxially arranged. The mounting ring 12 and the connecting platform 20 are fixedly connected. The bottom of the mounting ring 12 is in contact with the second base 10. A plug-in block 21 is provided on the top of the connecting platform 20. The plug-in block 21 and the connecting platform 20 are coaxially arranged. The plug-in block 21 and the connecting platform 20 are integrally formed. The plug-in block 21 is plugged into the inside of the chuck 13. The chuck 13 and the plug-in block 21 are coaxially and fixedly connected.

[0048] Reference Figure 3 and Figure 4 The protective cover 11 is umbrella-shaped and includes a plurality of umbrella plates 22 and a connecting plate 23. In this embodiment, eight umbrella plates 22 are provided, and the eight umbrella plates 22 are evenly arranged around the axis of the mounting ring 12. One side of the umbrella plate 22 is fixed to the bottom of the mounting ring 12 by bolts (not shown in the figure), and the other side of the umbrella plate 22 is inclined downward, and the length of the umbrella plate 22 away from the mounting ring 12 is greater than the length of the umbrella plate 22 close to the mounting ring 12.

[0049] Reference Figure 3 and Figure 4 A connecting plate 23 is provided between every two adjacent umbrella plates 22. Therefore, in this embodiment, eight connecting plates 23 are provided. One side of the connecting plate 23 is fixed to the bottom plate of the mounting ring 12 by bolts (not shown in the figure), and the other side of the connecting plate 23 is inclined downward. A lap groove 24 is provided on the connecting plate 23, and the lap groove 24 opens upward. The edges of both sides of the umbrella plate 22 are bent downward, and the edges of the umbrella plate 22 bent downward overlap in the adjacent lap grooves 24.

[0050] Reference Figure 1 and Figure 4The connection seat 1 is provided with a vertical launch well 25 and an oblique launch well 26. The vertical launch well 25 is a semi-cylinder. The vertical launch well 25 is coaxially arranged with the connection seat 1. The radius of the vertical launch well 25 is equal to the radius of the connection seat 1. The bottom of the vertical launch well 25 conflicts with the connection seat 1. The oblique launch well 26 is a semi-cylinder. The oblique launch well 26 is coaxially arranged with the connection seat 1. The oblique launch well 26 is coaxially arranged with the connection seat 1. The radius of the oblique launch well 26 is equal to the radius of the connection seat 1. The bottom of the oblique launch well 26 conflicts with the connection seat 1. The side wall of the vertical launch well 25 conflicts with the side wall of the oblique launch well 26. The vertical launch well 25 and the oblique launch well 26 are combined to form a cylinder.

[0051] Reference Figure 6 A first assembly groove 27 is provided on the vertical launch well 25. The first assembly groove 27 is a through groove in the vertical direction. The cross section of the first assembly groove 27 is semicircular. The first assembly groove 27 is coaxially arranged with the vertical launch well 25. A second assembly groove 28 is provided at the bottom of the vertical launch well 25. The second assembly groove 28 opens downward. The cross section of the second assembly groove 28 is semicircular. The second assembly groove 28 is coaxially arranged with the vertical launch well 25. The second assembly groove 28 is connected with the first assembly groove 27. The radius of the cross section of the second assembly groove 28 is greater than the radius of the cross section of the first assembly groove 27. A limiting groove 29 is provided on the side wall of the vertical launch well 25. The limiting groove 29 is a through groove in the horizontal direction. The limiting groove 29 is connected with the second assembly groove 28.

[0052] Reference Figure 6 and Figure 7 , two second receiving grooves 30 are provided at the bottom of the vertical launch shaft 25, the second receiving grooves 30 open downward, the second receiving grooves 30 are cylindrical, the positions of the two second receiving grooves 30 correspond to the first receiving groove 4 one by one, the second receiving groove 30 is connected to the first receiving groove 4, the axis of the second receiving groove 30 coincides with the axis of the first receiving groove 4, and the radius of the cross section of the second receiving groove 30 is greater than the radius of the cross section of the first receiving groove 4. Two third receiving grooves 31 are provided on the vertical launch shaft 25, the third receiving groove 31 opens upward, the third receiving groove 31 is cylindrical, the positions of the two third receiving grooves 31 correspond to the second receiving groove 30 one by one, the third receiving groove 31 is connected to the second receiving groove 30, forming a through groove in the vertical direction. The axis of the third receiving groove 31 coincides with the axis of the second receiving groove 30, and the radius of the cross section of the third receiving groove 31 is greater than the radius of the cross section of the second receiving groove 30.

[0053] Reference Figure 7, a first reset rod 32 is inserted into each first receiving groove 4, the first reset rod 32 is coaxially arranged with the first receiving groove 4, and the first reset rod 32 is fixedly connected to the connecting seat 1. A second reset rod 33 is coaxially arranged on the top of the first reset rod 32, and the second reset rod 33 is integrally formed with the first reset rod 32. The second reset rod 33 is located in the through groove formed by the second receiving groove 30 and the third receiving groove 31, and the radius of the second reset rod 33 is greater than the radius of the cross section of the first receiving groove 4. A reset block 34 is coaxially arranged on the top of the second reset rod 33, and the reset block 34 is integrally formed with the second reset rod 33. The reset block 34 is located in the third receiving groove 31, and the radius of the reset block 34 is greater than the radius of the second reset rod 33.

[0054] Reference Figure 7 , a spring 35 is sleeved on the second reset rod 33, and the spring 35 is located in the third receiving groove 31. One end of the spring 35 is fixedly connected to the bottom of the reset block 34, and the other end of the spring 35 is fixedly connected to the bottom of the third receiving groove 31. When the bottom of the vertical launch shaft 25 completely contacts the top of the connecting seat 1, the spring 35 is in a natural state.

[0055] Reference Figure 7 and Figure 8 The oblique launch well 26 is provided with a third assembly groove 36, which is a through groove in the vertical direction, and has a semicircular cross section. The third assembly groove 36 is coaxially arranged with the oblique launch well 26. The third assembly groove 36 is connected with the first assembly groove 27 to form a complete cylindrical groove, and the connecting tube 9 is located in the through groove formed by the first assembly groove 27 and the third assembly groove 36. The side wall of the connecting tube 9 conflicts with the side wall of the first assembly groove 27, and the side wall of the connecting tube 9 conflicts with the side wall of the third assembly groove 36.

[0056] Reference Figure 4 and Figure 8 A fourth assembly groove 37 is provided at the bottom of the oblique launch well 26. The fourth assembly groove 37 opens downward. The cross section of the fourth assembly groove 37 is semicircular. The fourth assembly groove 37 is coaxially arranged with the oblique launch well 26. The fourth assembly groove 37 is connected with the third assembly groove 36. The radius of the cross section of the fourth assembly groove 37 is greater than the radius of the cross section of the third assembly groove 36. The fourth assembly groove 37 is connected with the second assembly groove 28 to form a complete cylindrical groove. The first base 8 is located in the through groove formed by the second assembly groove 28 and the fourth assembly groove 37. The side wall of the first base 8 conflicts with the side wall of the second assembly groove 28, and the side wall of the first base 8 conflicts with the side wall of the fourth assembly groove 37.

[0057] Reference Figure 4The electromagnet 7 is located in the through groove formed by the second assembly groove 28 and the fourth assembly groove 37, the side wall of the electromagnet 7 conflicts with the side wall of the second assembly groove 28, and the side wall of the electromagnet 7 conflicts with the side wall of the fourth assembly groove 37. The limit block 14 is located in the limit groove 29, and there is a gap between the limit block 14 and the side wall of the limit groove 29.

[0058] Reference Fig. 9 and Fig.10 The side wall of the oblique launch well 26 is provided with a connecting groove 38, which is a through groove in the horizontal direction and is connected to the third assembly groove 36. The side wall of the oblique launch well 26 is provided with a cylinder 39, which is fixed to the oblique launch well 26 by bolts (not shown in the figure), and the cylinder 39 covers the notch of the connecting groove 38, and the output shaft of the cylinder 39 is located in the connecting groove 38.

[0059] Reference Figure 4 and Figure 5 A clamping block 40 is fixedly connected to the output shaft of the cylinder 39, and the contour of the clamping block 40 matches the shape of the first clamping groove 16, and the contour of the clamping block 40 matches the shape of the second clamping groove 18. When the output shaft of the cylinder 39 pushes the clamping block 40 into the first clamping groove 16, the side wall of the clamping block 40 contacts the side wall of the first clamping groove 16, the top of the clamping block 40 fits the top of the first clamping groove 16, and the bottom of the clamping block 40 fits the bottom of the first clamping groove 16. The side wall of the clamping block 40 contacts the side wall of the second clamping groove 18, the top of the clamping block 40 fits the top of the second clamping groove 18, and the bottom of the clamping block 40 fits the bottom of the second clamping groove 18. The clamping block 40 is provided with a third clamping slot 41 , which is a through slot in the vertical direction. When the clamping block 40 is inserted into the first clamping slot 16 , the clamping piece 19 is inserted into the third clamping slot 41 .

[0060] Reference Fig. 9 and Fig.10 The bottom of the oblique launch well 26 is provided with two torsion grooves 42, the torsion grooves 42 open downward, the positions of the torsion grooves 42 correspond to the connection blocks 5, and the connection blocks 5 are located in the torsion grooves 42. The connection blocks 5 are connected to the torsion grooves 42 through torsion springs (not shown in the figure), and when the bottom of the oblique launch well 26 is completely in conflict with the connection seat 1, the torsion springs are in a natural state.

[0061] The implementation principle of the needle puncture test fixture base of the embodiment of the present application is as follows: when performing a bottom needle puncture test on a new energy vehicle battery pack, use the clamp 13 to clamp the steel needle, energize the electromagnet 7 to fix the positions of the vertical launch well 25 and the oblique launch well 26, start the cylinder 39, push the clamping block 40 into the first clamping groove 16, and at the same time, the clamping piece 19 is inserted into the third clamping groove 41, thereby locking the clamping block 40, the connecting column 17 and the connecting tube 9. The connecting seat 1 rises to allow the steel needle to penetrate into the battery pack, and is kept for a period of time to observe whether the sample changes.

[0062] If the steel needle needs to be pulled out, the connecting seat 1 can be directly lowered. If the steel needle needs to be left in the battery pack for further observation, the cylinder 39 can be started to separate the clamping block 40 from the connecting tube 9, and then the connecting seat 1 can be lowered, so that the chuck 13, the protective cover 11, the second base 10, the connecting column 17 and the steel needle remain under the battery pack. When the steel needle is too long, the escape state can be adopted. After the needle is pulled out, the electromagnet 7 is powered off. In the process of pulling the connecting seat 1, the steel needle encounters an obstacle, and the oblique launch well 26 is flipped to a certain angle to avoid danger. The vertical launch well 25 rises under the lifting of the limit block 14. After the escape is completed, the oblique launch well 26 is reset under the action of the tension spring, and the vertical launch well 25 is reset under the action of the spring 35.

[0063] A puncture test fixture base provided in an embodiment of the present application can be used for a puncture test on the bottom of a battery pack. While accurately simulating bottom puncture, it provides an optional post-processing solution that can be flexibly applied to different scenarios, thereby improving the test efficiency of the puncture test.

[0064] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A needle puncture test fixture base, characterized in that: The invention comprises a connecting seat (1), wherein the connecting seat (1) is provided with an electromagnet (7), an oblique launching well (26) and a vertical launching well (25), wherein the side wall of the vertical launching well (25) abuts against the side wall of the oblique launching well (26), wherein the electromagnet (7) is located between the vertical launching well (25) and the oblique launching well (26), wherein the oblique launching well (26) abuts against the side wall of the electromagnet (7), wherein the side wall of the electromagnet (7) abuts against the inner wall of the vertical launching well (25), wherein the electromagnet (7) is provided with a connecting tube (9), wherein one side of the connecting tube (9) is provided with a first clamping groove (16), wherein a connecting column (17) is inserted into the connecting tube (9), wherein one side of the connecting column (17) is provided with a second clamping groove (16), wherein the connecting column (17) is provided with a second clamping groove (16), wherein the connecting column (17) is provided with a second clamping groove (16), wherein the connecting column (17) is provided with a second clamping groove (16), wherein the connecting column (17) is provided with a second clamping groove (16), wherein the connecting column (17) is provided with a second clamping groove (16), wherein the connecting column (17) is provided with a second clamping groove (16), wherein the connecting column (17) is provided with a second clamping groove (16). A connecting groove (18), the first connecting groove (16) and the second connecting groove (18) are connected, a connecting piece (19) is arranged in the second connecting groove (18), a cylinder (39) is arranged on one side of the inclined launch well (26), an output shaft of the cylinder (39) passes through the inclined launch well (26), a connecting block (40) is connected to the output shaft of the cylinder (39), the connecting block (40) is inserted into the first connecting groove (16), a third connecting groove (41) is provided on the connecting block (40), the connecting piece (19) is inserted into the third connecting groove (41), a chuck (13) is connected to the connecting column (17), and the chuck (13) is used to clamp the steel needle.

2. The needle puncture test fixture base according to claim 1, characterized in that: The chuck (13) and the connecting tube (9) are connected via a second base (10); a mounting ring (12) is provided on the second base (10); a protective cover (11) is provided on the mounting ring (12); and the protective cover (11) is umbrella-shaped.

3. The needle puncture test fixture base according to claim 2, characterized in that: The protective cover (11) comprises a plurality of umbrella plates (22) and a connecting plate (23); the umbrella plates (22) are arranged around the axis of the mounting ring (12); and adjacent umbrella plates (22) are connected via the connecting plate (23).

4. The needle puncture test fixture base according to claim 1, characterized in that: A first base (8) is provided between the connecting tube (9) and the electromagnet (7), the first base (8) being fixed to the connecting tube (9), and a latch (15) being provided on the first base (8), the latch (15) being plugged into the electromagnet (7).

5. The needle puncture test fixture base according to claim 1, characterized in that: A limiting groove (29) is provided on the vertical launch shaft (25), a limiting block (14) is fixed on one side of the electromagnet (7), and the limiting block (14) is located in the limiting groove (29).

6. The needle puncture test fixture base according to claim 5, characterized in that: A connecting block (5) is provided on the connecting seat (1), a torsion groove (42) is provided on the inclined launch shaft (26), and the connecting block (5) is located in the torsion groove (42).

7. The needle puncture test fixture base according to claim 6, characterized in that: The connection block (5) is connected to the inclined launch well (26) via a torsion spring, and when the bottom of the inclined launch well (26) is in full contact with the connection seat (1), the torsion spring is in a natural state.

8. The needle puncture test fixture base according to claim 7, characterized in that: The vertical launch shaft (25) is provided with a third receiving groove (31), a second reset rod (33) is provided in the third receiving groove (31), the second reset rod (33) is fixedly connected to the connecting seat (1), a spring (35) is sleeved on the second reset rod (33), one end of the spring (35) is connected to the second reset rod (33), and the other end of the spring (35) is connected to the bottom of the third receiving groove (31).

9. The needle puncture test fixture base according to claim 8, characterized in that: The connecting seat (1) is provided with a first accommodating groove (4), a first reset rod (32) is fixed in the first accommodating groove (4), and the first reset rod (32) is fixedly connected to a second reset rod (33).

Images