General fixture for pricking the top of an electric cell

Abstract

This application provides a universal clamp for top needle penetration testing of battery cells, relating to the field of battery puncture testing technology. It includes a support plate and two base rods. The support plate is used to place the battery cell. Two base plates are rotatably connected between the two base rods via pins. The two base rods and two base plates are combined to form a rectangular frame. The bottom surface of the base plates is lower than the base rods. A support rod is fixed on the base plate. The support rod has a toothed structure on its side facing the support plate. Each tooth of the toothed structure has a guide slope and a support plane located above the guide slope. This application uses the support plane of the toothed structure to support the weight of the support plate, resulting in a reasonable force direction, a large contact area, high support strength, and no slippage problems. Each time it is lifted, only one end of the support plate needs to be moved up, and only the height of one toothed structure needs to be increased before releasing the handle, making the height adjustment of the support plate convenient and effortless. The combination of a locking rod and a locking frame ensures the stability of the support plate during the needle penetration test, enabling the clamping and fixing of square battery cells of various sizes.

Description

Technical Field

[0001] This application relates to the field of battery puncture testing technology, and in particular to a universal clamp for needle puncture of the top of a battery cell. Background Technology

[0002] Among the safety performance of electric vehicles, battery safety is the most important factor. Battery cell fires are characterized by their speed, ferocity, and difficulty in being extinguished, resulting in an extremely high casualty rate. Therefore, battery safety testing is very comprehensive and rigorous, including puncture tests, which can be performed by puncturing the top or bottom.

[0003] Utility model patent CN216900155U discloses a ball impact and needle penetration testing machine for power batteries, including a support frame, a battery pack fixing frame, a battery pack, a power distribution cabinet, a dual-computer control cabinet, a front-to-back synchronous movement component, a front-to-back and left-to-right movement component, and a moving ball impact and needle penetration component. The machine uses an up-and-down drive module to apply force to a ball screw, pushing the ball impact head on the guide rod to move downwards. In use, the battery pack is placed on the battery pack fixing frame, and then the screw is rotated by a handwheel to drive the battery pack pressure plate to press the battery pack. The entire fixing plate can be adjusted left and right to accommodate battery packs of different sizes.

[0004] For the aforementioned technologies, clamps can also be used to fix the battery cells. Different models of battery cells have different thicknesses, and the height of the battery cells also needs to be adjusted to a suitable testing position. The height of traditional clamps is adjusted by fixing with bolts, which may cause displacement when the needle force is large, affecting the actual needle feed. Summary of the Invention

[0005] This application provides a universal clamp for needle-punching the top of a battery cell, which prevents the battery cell from shifting downwards during needle-punching by using a stepped fixing method, and makes adjustment more convenient.

[0006] This application provides a universal clamp for needle punching the top of a battery cell, which adopts the following technical solution: A universal clamp for top needle punching of battery cells includes a support plate and two base rods. The support plate is used to place the battery cell. The two base rods are rotatably connected to two base plates by a pin. The two base rods and two base plates are combined to form a rectangular frame. The bottom surface of the base plate is lower than the base rod. A support rod is fixed on the base plate. The support rod has a toothed structure on the side facing the support plate. Each tooth of the toothed structure has a guide slope and a support plane located above the guide slope. The support plane is used to support the bottom surface of the support plate.

[0007] By employing the above technical solution, when the height of the support plate needs to be increased, first lift one end of the support plate. The side wall of the support plate slides against the guide ramp. As the end of the support plate moves upward, the support rod deflects slightly outward around the pin. Since the bottom surface of the base plate is pressed against the platform, the base plate tends to return to a horizontal state, and the support rod returns to a vertical state and will not fall over. After the end of the support plate passes through a toothed structure, the upper support plane supports the support plate again. By alternately lifting the left and right ends of the support plate in this way, the height of the support plate can be increased.

[0008] Optionally, the base rod is connected to a locking rod, and the side wall of the base plate is provided with a locking hole for the locking rod to be inserted.

[0009] By adopting the above technical solution, after the height of the support plate is adjusted, the locking rod is inserted into the locking hole to prevent the base plate from rotating.

[0010] Optionally, a locking groove is provided at the top of the support rod, and a locking frame is placed in the locking grooves of both support rods.

[0011] By adopting the above technical solution, the locking frame is used to prevent the tops of the support rods on both sides from moving away from each other, thus ensuring the stability of the support plate during the needle penetration test.

[0012] Optionally, a U-shaped clip is fitted onto the side wall of the support rod, and the U-shaped clip confines the locking frame within the locking groove through the inner wall.

[0013] By adopting the above technical solution, the U-shaped card confines the locking frame within the locking groove through the inner wall, preventing the locking frame from moving upward and dislodging from the locking groove, thus improving stability.

[0014] Optionally, the inner wall of the U-shaped clip is equipped with a spring buckle, and the support rod is provided with a limiting groove for the spring buckle to be inserted.

[0015] By adopting the above technical solution, after the spring clip is embedded in the limiting groove, the installation of the U-shaped card is positioned by the spring clip, which prevents the U-shaped card from moving on its own and facilitates quick installation and removal of the U-shaped card.

[0016] Optionally, the support plate is slidably connected with two pairs of sliders along its length, and each pair of sliders is slidably connected with a clamping plate along its vertical direction. A fixing bolt is passed through the clamping plate, and the clamping plate has a groove for the fixing bolt to slide vertically. The fixing bolt passes through the groove and is threadedly connected to the slider.

[0017] By adopting the above technical solution, after loosening the fixing bolts, the clamping plate moves left and right, driving the sliding slider to move, thereby adapting to battery cells of different lengths. By sliding the clamping plate up and down, it can adapt to battery cells of different thicknesses. After tightening the fixing bolts, the position of the clamping plate is fixed, thereby realizing the clamping and fixing of various square battery cells of different sizes.

[0018] Optionally, the left and right side walls of the support plate are inclined surfaces facing upwards, which correspond to the guide inclined surfaces.

[0019] By adopting the above technical solution, when the support plate contacts the guide slope through the inclined surfaces on both sides, the guiding and pushing effect is improved, and it can get close enough to the tooth structure so that the bottom surface of the support plate can reliably contact the support plane.

[0020] Optionally, the sidewall of the support rod is connected to a metal hook by a metal chain, and handles are fixed to the left and right ends of the support plate, respectively.

[0021] By adopting the above technical solution, this device is placed on a grid-shaped submerged platform / plane by a base rod, fixed to the platform by a metal hook, and the handle makes it easy for personnel to lift the end of the support plate.

[0022] Optionally, a round rod is placed on the base rod, and two U-shaped support rods are rotatably connected to the round rod. A connecting rod is rotatably connected to the middle of the support rod, and a nut is fixed to the middle of the connecting rod. A double-ended screw is threaded through the two nuts, and the two ends of the double-ended screw have opposite threads and are threaded to the two nuts respectively.

[0023] By adopting the above technical solution, the bidirectional screw drives the two nuts to move closer or further apart when rotating, thereby pulling the two support rods closer or further apart. During this process, the connecting rod rotates adaptively. Before the needle penetration test, the round rod is moved to the middle of the bottom rod, and the bidirectional screw is rotated to bring the two support rods closer together and make them contact the bottom surface of the support plate. This helps to support the weight of the support plate and prevents the middle of the support plate from bending downwards. In needle penetration tests with heavy weight and high pressure, this significantly improves the support capacity for the battery cell.

[0024] Optionally, a support block is fixed to the top surface of the bottom rod. The support block is close to the support rod. The top surface of the support block is provided with a groove for the round rod to be inserted. The side of the support block away from the support rod is an upward inclined surface.

[0025] By adopting the above technical solution, during the process of lifting the support plate, rotating the bidirectional screw causes the two support rods to move away from each other, moving the round rod onto the support block. The inclined surface of the support block facilitates the sliding passage of the round rod. After the round rod enters the groove, the two support rods rotate around the round rod, acting as pry bars to facilitate lifting the bottom surface of the support plate, thus assisting in lifting heavy battery cells.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The weight of the support plate is supported by multiple toothed support planes, the force direction is reasonable, the contact area is large, the support strength is high, and there will be no slippage problem; 2. Each time you lift it, you only need to move one end of the support plate up, and only move it up by the height of one tooth structure before you can let go. Adjusting the height of the support plate is convenient and effortless. 3. The combination of locking rod and locking frame ensures the stability of the support plate during the needle penetration test; 4. Enables clamping and fixing of square battery cells of various sizes. Attached Figure Description

[0027] Figure 1 This is a perspective view of a universal clamp for needle punching the top of a battery cell according to Embodiment 1; Figure 2 This is a front sectional view of Embodiment 1; Figure 3 yes Figure 2 A magnified view of a portion of the image; Figure 4 This is an exploded view of Example 1; Figure 5 This is a front view of Embodiment 2; Figure 6 This is a perspective view of the movable tool in Embodiment 2; Figure 7 This is a schematic diagram of the movable tool used as a pry bar in Embodiment 2.

[0028] Explanation of reference numerals in the attached drawings: 1. Support plate; 2. Base rod; 21. Pin; 3. Base plate; 31. Support rod; 32. Tooth structure; 33. Guide slope; 34. Support plane; 35. Metal hook; 11. Handle; 22. Locking rod; 36. Locking hole; 37. Locking groove; 4. Locking frame; 41. U-shaped clip; 42. Spring buckle; 38. Limiting groove; 5. Sliding block; 51. Clamping plate; 52. Fixing bolt; 53. Slide groove; 6. Round rod; 7. Support rod; 71. Connecting rod; 72. Nut; 73. Double-acting screw; 23. Support block; 24. Embedded groove. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] Example 1:

[0031] Reference Figure 1 , Figure 2 and Figure 3 This embodiment discloses a universal clamp for needle-punching the top of a battery cell, including a support plate 1 and two base rods 2. The support plate 1 is used to place the battery cell, and the two base rods 2 are arranged in parallel. Two base plates 3 are rotatably connected between the two base rods 2 by a pin 21. The two base rods 2 and the two base plates 3 are combined to form a rectangular frame, and the bottom surface of the base plate 3 is lower than that of the base rod 2. The outer bottom edge of the base plate 3 is an arc surface, and the pin 21 is located on the horizontal inward side of the arc surface.

[0032] A support rod 31 is fixed on the base plate 3. The support rod 31 has an inverted U-shaped structure. There are four vertical parts of the support rod 31 on both sides, which are distributed at the four corners of the device. The side of the support rod 31 facing the support plate 1 is provided with a tooth structure 32. The tooth structure 32 is inverted tooth shape. Each tooth of the tooth structure 32 is provided with a guide slope 33 and a support plane 34 located above the guide slope 33. The support plane 34 is used to support the bottom surface of the support plate 1. The guide slope 33 is used to provide an outward thrust to the support rod 31 when the support plate 1 moves upward.

[0033] Metal hooks 35 are connected to the side walls of the support rod 31 via metal chains, and handles 11 are fixed to the left and right ends of the support plate 1. The handles 11 facilitate personnel to lift the ends of the support plate 1. This device is placed on a grid-like submerged platform / plane via the base rod 2 and fixed to the platform by the metal hooks 35. It should be noted that the metal hooks 35 and the metal chains are not taut; they only serve to prevent detachment and therefore do not affect the free rotation of the support rod 31.

[0034] The left and right side walls of the support plate 1 are inclined upwards, which correspond to the guide inclined surface 33, improving the guiding and pushing effect, and can get close enough to the tooth structure 32, so that the bottom surface of the support plate 1 can reliably contact the support plane 34.

[0035] The base rod 2 is connected to a locking rod 22. The side wall of the base plate 3 is provided with a locking hole 36 for the locking rod 22 to be inserted. After the locking rod 22 is inserted into the locking hole 36, the base plate 3 can be prevented from rotating.

[0036] Reference Figure 3 and Figure 4 The top of the support rod 31 has a locking groove 37. A locking frame 4 is placed in the locking grooves 37 of both support rods 31. The locking frame 4 is used to prevent the tops of the two support rods 31 from moving away from each other, ensuring the stability of the support plate 1 during the needle penetration test. The needle-piercing component passes through the locking frame 4 without touching it. A U-shaped clip 41 is sleeved on the side wall of the support rod 31. The U-shaped clip 41 limits the locking frame 4 to the locking groove 37 through its inner wall, preventing the locking frame 4 from moving upward and detaching from the locking groove 37, thus improving stability. To prevent the U-shaped clip 41 from spontaneously detaching from its installation position, a spring clip 42 is installed on the inner wall of the U-shaped clip 41. The support rod 31 has a limiting groove 38 for the spring clip 42 to be inserted. The spring clip 42 positions the U-shaped clip 41 and facilitates quick installation and removal of the U-shaped clip 41.

[0037] Reference Figure 2 and Figure 4The support plate 1 has two pairs of sliders 5 slidably connected along its length. Each pair of sliders 5 is slidably connected to a clamping plate 51 along its vertical direction. The clamping plate 51 has an inverted U-shaped structure, with its side plates perpendicular to the top plate. A fixing bolt 52 passes through the clamping plate 51, and a groove 53 is provided on the clamping plate 51 for the fixing bolt 52 to slide vertically. The fixing bolt 52 passes through the groove 53 and is threadedly connected to the slider 5. Preferably, there are three fixing bolts 52 and three grooves 53 on each side. The clamping plate 51 presses down on both sides of the top surface of the battery cell through the top plate, without obstructing the area for the needle penetration test. After loosening the fixing bolts 52, the clamping plate 51 and the slider 5 can be moved.

[0038] The distance can be adjusted by moving the clamp 51 left and right to accommodate battery cells of different lengths. The clamp 51 can be slid up and down to accommodate battery cells of different thicknesses. After tightening the fixing bolt 52, the position of the clamp 51 is fixed, thus achieving the clamping and fixing of various sizes of square battery cells.

[0039] The implementation principle of a universal clamp for top needle punching of a battery cell according to an embodiment of this application is as follows: after one end of the locking frame 4 is removed, it is flipped to the other end and placed. The battery cell is fixed by the clamping plate 51 and the fixing bolt 52. The locking rod 22 is pulled out of the locking hole 36. The weight of this device is transferred to the platform through the base plate 3.

[0040] When the height of the support plate 1 needs to be increased, one end of the support plate 1 is lifted by the handle 11. The side wall of the support plate 1 slides against the guide slope 33. As the end of the support plate 1 moves upward, the support rod 31 deflects slightly outward around the pin 21. Since the bottom surface of the base plate 3 is pressed against the platform, the base plate 3 tends to return to a horizontal state, and the support rod 31 returns to a vertical state and will not fall down. After the end of the support plate 1 passes through a toothed structure 32, the upper support plane 34 supports the support plate 1 again. By alternately lifting the left and right ends of the support plate 1 in this way, the height of the support plate 1 can be increased. Since each lift only requires moving one end of the support plate 1 upward, and only by the height of one toothed structure 32, it is more labor-saving.

[0041] When it is necessary to lower the height of the support plate 1, apply upward force to the end of the support plate 1, and at the same time slightly bend the support rod 31 outward. The end of the support plate 1 can then fall onto the support plane 34 of the next tooth structure 32. By alternating the left and right ends of the support plate 1 in this way, the height of the support plate 1 can be lowered.

[0042] After the height of the support plate 1 is adjusted, the locking rod 22 is inserted into the locking hole 36 to prevent the base plate 3 from rotating. The two ends of the locking frame 4 are placed into the two locking slots 37 and the U-shaped clips 41 are fastened to limit the upper end of the support rod 31, which can completely stabilize the support rod 31 and improve the stability of the support plate 1. Then, the battery cell is subjected to a needle penetration test.

[0043] Compared with bolt locking, this device supports the weight of the support plate 1 through the support plane 34 of multiple tooth structures 32. The force direction is reasonable, the contact area is large, the support strength is high, and there will be no slippage problem. Moreover, the height adjustment of the support plate 1 is convenient and labor-saving.

[0044] Example 2:

[0045] Reference Figure 5 and Figure 6 A universal clamp for needle-punching the top of a battery cell is disclosed. The difference between Embodiment Two and Embodiment One is that: a round rod 6 is placed on the base rod 2, and two U-shaped support rods 7 are rotatably connected to the round rod 6. A connecting rod 71 is rotatably connected to the middle of the support rods 7, and a nut 72 is fixed to the middle of the connecting rod 71. A bidirectional screw 73 is threaded through the two nuts 72, with opposite threads at both ends of the bidirectional screw 73, each threadedly connected to one of the two nuts 72. A screw head is fixed to each end of the bidirectional screw 73. When the bidirectional screw 73 rotates, it drives the two nuts 72 to move closer or further apart, thereby pulling the two support rods 7 closer or further apart. During this process, the connecting rod 71 rotates adaptively.

[0046] A support block 23 is fixed on the top surface of the bottom rod 2. The support block 23 is close to the support rod 31. The top surface of the support block 23 is provided with a groove 24 for the round rod 6 to be inserted. The side of the support block 23 away from the support rod 31 is an upward inclined surface.

[0047] The added structure in this embodiment serves as a movable tool that can be dragged by personnel. Before the needle penetration test, the round rod 6 is moved to the middle of the bottom rod 2, and the bidirectional screw 73 is rotated to bring the two support rods 7 closer together and make them contact the bottom surface of the support plate 1. This helps to support the weight of the support plate 1 and prevents the middle of the support plate 1 from bending downwards. In needle penetration tests with heavy weight and high pressure, this significantly improves the support capacity for the battery cell.

[0048] Reference Figure 7 During the lifting of the support plate 1, the double-acting screw 73 is rotated to move the two support rods 7 away from each other, and the round rod 6 is moved onto the support block 23. The inclined surface of the support block 23 facilitates the sliding passage of the round rod 6. After the round rod 6 enters the groove 24, the two support rods 7 rotate around the round rod 6, which is used as a pry bar to facilitate lifting the bottom surface of the support plate 1. This provides an auxiliary lifting effect for heavy battery cells. The end of the support plate 1 can be lifted effortlessly by stepping on the outer end of the support rod 7 and lifting the handle 11 at the end of the support plate 1 with the hands, reducing the load on the waist of the personnel.

[0049] In addition, both the device and the portable tool are made of metal and contain no electronic components or cables, meeting the safety requirements for battery cell fire and submersion conditions without causing damage to the device.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A top cell needling universal fixture, characterized in that: The device includes a support plate (1) and two base rods (2). The support plate (1) is used to place the battery cell. The two base rods (2) are rotatably connected to two base plates (3) by a pin (21). The two base rods (2) and the two base plates (3) are combined to form a rectangular frame. The bottom surface of the base plate (3) is lower than the base rod (2). A support rod (31) is fixed on the base plate (3). The support rod (31) has a tooth structure (32) on the side facing the support plate (1). Each tooth of the tooth structure (32) has a guide slope (33) and a support plane (34) located above the guide slope (33). The support plane (34) is used to support the bottom surface of the support plate (1).

2. The top cell needling universal fixture of claim 1, wherein: The base rod (2) is connected to a locking rod (22), and the side wall of the base plate (3) is provided with a locking hole (36) for the locking rod (22) to be inserted.

3. The top cell needling fixture of claim 1, wherein: The top of the support rod (31) is provided with a locking groove (37), and a locking frame (4) is placed in the locking groove (37) of both support rods (31).

4. The top cell needling fixture of claim 3, wherein: The side wall of the support rod (31) is fitted with a U-shaped clip (41), which limits the locking frame (4) to the locking groove (37) through the inner wall.

5. The top cell needling universal fixture of claim 4, wherein: The inner wall of the U-shaped clip (41) is equipped with a spring clip (42), and the support rod (31) is provided with a limiting groove (38) for the spring clip (42) to be inserted.

6. The top cell needling fixture of claim 1, wherein: The support plate (1) is slidably connected with two pairs of sliders (5) along its length. Each pair of sliders (5) is slidably connected with a clamping plate (51) along its vertical direction. A fixing bolt (52) is provided on the clamping plate (51). The clamping plate (51) has a groove (53) for the fixing bolt (52) to slide vertically. The fixing bolt (52) passes through the groove (53) and is threadedly connected to the slider (5).

7. The top cell needling fixture of claim 1, wherein: The left and right side walls of the support plate (1) are inclined surfaces facing upwards, which correspond to the guide inclined surface (33).

8. The top cell needling fixture of claim 1, wherein: The side wall of the support rod (31) is connected to a metal hook (35) by a metal chain, and the left and right ends of the support plate (1) are respectively fixed with handles (11).

9. The top cell needling fixture of claim 1, wherein: A round rod (6) is placed on the base rod (2). Two U-shaped support rods (7) are rotatably connected to the round rod (6). A connecting rod (71) is rotatably connected to the middle of the support rod (7). A nut (72) is fixed to the middle of the connecting rod (71). A double-ended screw (73) is threaded through the two nuts (72). The two ends of the double-ended screw (73) have opposite threads and are threaded to the two nuts (72) respectively.

10. The top cell needling universal fixture of claim 9, wherein: The top surface of the bottom rod (2) is fixed with a support block (23), the support block (23) is close to the support rod (31), the top surface of the support block (23) is provided with a groove (24) for the round rod (6) to be inserted, and the side of the support block (23) away from the support rod (31) is an inclined surface facing upward.

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