Clamping tool

Abstract

The utility model discloses a clamping tool, including test platform, clamping mechanism and connecting mechanism, a group of clamping mechanism of symmetrical arrangement is placed on test platform, and clamping mechanism is locked with test platform through connecting mechanism, and the containment space is formed between clamping mechanism and test platform, and the thickness of test platform is greater than the thickness of clamping mechanism. The utility model has the advantages of: through setting up clamping tool can be to different number of battery clamping, and it is convenient for ball hit experiment, and the thickness of test platform is greater than the thickness of clamping mechanism to guarantee the support intensity.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to clamping fixtures. Background Technology

[0002] As the core power source of new energy vehicles, the safety of the power battery directly affects the overall safety performance of the vehicle. The battery pack housing, as a crucial component of the power battery, plays a vital role in protecting the internal cells and modules. During actual driving, the battery pack located under the chassis of new energy vehicles is prone to collisions with ground obstacles, posing a severe challenge to the battery's structural strength and protective capabilities.

[0003] To verify the safety of battery packs under extreme operating conditions, the industry has adopted stringent bottom impact test standards. The new national standard GB38031-2025 clearly stipulates the requirements for bottom impact testing of batteries. A steel impact head with a diameter of 30 mm is used to impact three risk points on the bottom of the battery pack at 150 joules of energy. The battery is required to show no leakage, shell rupture, fire or explosion after being impacted.

[0004] High-energy ball impact testing effectively verifies the structural strength and impact resistance of the battery pack, ensuring its safety and stability even under extreme bottom-feed scenarios. If the battery pack fails the ball impact test, exhibiting cracking, water immersion, or cell failure, the bottom protection design needs optimization, such as adding protective beams or armor plating for structural reinforcement. It is worth noting that different cells have different safety boundaries, making it difficult to accurately evaluate their safety in whole-pack ball impact simulations. Multi-cell ball impact testing is necessary to determine the safety boundaries of individual cells, providing reliable data support for whole-pack simulation evaluations.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The technical problem to be solved by this utility model is to solve the problem of poor results in the battery cell ball impact test.

[0007] This utility model solves the above-mentioned technical problems through the following technical means: This utility model claims to protect a clamping fixture, including a test table, a clamping mechanism and a connecting mechanism; a set of clamping mechanisms are symmetrically arranged on the test table, the clamping mechanisms are locked to the test table by the connecting mechanism, and the clamping mechanisms and the test table enclose a receiving space, the thickness of the test table is greater than the thickness of the clamping mechanism.

[0008] By setting clamping fixtures, different numbers of battery cells can be clamped, which facilitates ball impact testing. The thickness of the test platform is greater than the thickness of the clamping mechanism to ensure support strength.

[0009] Preferably, the clamping mechanism includes a horizontal plate segment and a vertical plate segment. The horizontal plate segment fits against the test stage and is locked to each other by a connecting mechanism. The vertical plate segment forms the inner wall of the accommodating space.

[0010] It is necessary to ensure that there is at least one horizontal plate section for connecting the test bench and at least one vertical plate section for clamping the battery cell.

[0011] Preferably, the thickness of the horizontal plate segment should meet the following formula: d 3 ≥1.5d 2 The thickness of the longitudinal plate section is d 2. The thickness of the horizontal plate section is d 3.

[0012] Preferably, the thickness of the test stage should meet the following formula: d 4 ≥1.5d 3 The thickness of the horizontal plate section is d 3. The thickness of the test stage is d 4.

[0013] In the transverse direction of the entire fixture, it mainly serves a clamping function to prevent deformation and displacement during ball impact. In the longitudinal direction of the entire fixture, it needs to ensure sufficient strength to not only provide the support required for clamping but also prevent overall deformation during ball impact. Therefore, it is necessary to ensure that the longitudinal plate section, the transverse plate section, and the test platform have a sufficiently high thickness ratio.

[0014] Preferably, it also includes an insulating buffer, which is provided on the surface of the longitudinal plate segment facing the accommodating space.

[0015] When clamping, to prevent damage to the battery cell, insulating buffer material can be filled at the clamping point.

[0016] Preferably, the insulating buffer is aerogel or MPP.

[0017] MPP refers to microporous foamed polypropylene, a common lightweight, high-strength, and environmentally friendly material.

[0018] Preferably, it also includes an insulating board, with the insulating board arranged at the bottom of the accommodating space.

[0019] By installing an insulating plate, the test platform can be isolated from the battery cell to prevent spark discharge during ball impact.

[0020] Preferably, the thickness of the insulating board is d1, d1≥5mm.

[0021] Preferably, the connecting mechanism is a bolt, with a through hole in the horizontal plate section and several screw holes correspondingly opened on the test platform. The screw holes are arranged along the length of the test platform, and the bolt passes through the through hole and engages with the corresponding screw hole.

[0022] Preferably, the clamping mechanism has an L-shaped plate structure, with the horizontal part of the L-shaped plate being the transverse plate segment and the vertical part of the L-shaped plate being the longitudinal plate segment.

[0023] The clamping mechanism is not limited to an L-shape; it can also be U-shaped. However, it must ensure that there is at least one horizontal plate segment for connecting to the test bench and at least one vertical plate segment for clamping the battery cell. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the clamping fixture for clamping and fixing the multi-cell ball impact test in the embodiment of this utility model; Figure 2 This is a front view of the clamping fixture in an embodiment of this utility model; 1. Test stand; 2. Insulating board; 3. Clamping mechanism; 30. Longitudinal plate section; 31. Horizontal plate section; 4. Bolt; 5. Battery cell. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] See Figure 1 This embodiment requires a protective clamping fixture for clamping and fixing multiple battery cells 5 for ball impact testing; it includes a test platform 1, an insulating plate 2, a clamping mechanism 3, and bolts 4; the test platform 1 has a horizontal surface, which is the foundation of the entire fixture; the insulating plate 2 is placed on the test platform 1, and three battery cells 5 are arranged along the length of the upper surface of the insulating plate 2, which separates and insulates the battery cells 5 from the test platform 1; the number of battery cells 5 is not limited to three, and can be determined by comprehensively considering the size of the insulating plate 2 and the number of cells to be tested; when there are multiple battery cells 5, it is necessary to ensure that the battery cells 5 are assembled according to the actual assembly gap and connection relationship of the module battery cells 5, so as to ensure that the deformation form of the battery cells 5 in the ball impact test is consistent with that in the whole pack ball impact test.

[0027] A set of clamping mechanisms 3 are symmetrically arranged on the test benches 1 on both sides of the insulating board 2. The clamping mechanism 3 is an integral L-shaped plate structure. The horizontal part of the clamping mechanism 3 is defined as the horizontal plate section 31, and the vertical part of the clamping mechanism 3 is defined as the vertical plate section 30. When clamping, the vertical plate section 30 is pressed against the battery cell 5 and the side of the insulating board 2. When pressing, in order to avoid damage to the battery cell 5, insulating buffer material (not shown in the figure) can be filled at the pressing part, such as aerogel or MPP. MPP refers to microporous foamed polypropylene, which is a common lightweight, high-strength and environmentally friendly material, and will not be described in detail.

[0028] The horizontal plate section 31 is attached to the surface of the test platform 1. A through hole is provided on the horizontal plate section 31, and several screw holes are provided on the test platform 1. The screw holes are arranged along the length of the test platform 1. The bolt 4 passes through the through hole and engages with the corresponding screw hole, thereby fixing the clamping mechanism 3 and finally clamping the battery cell 5.

[0029] In fact, the clamping mechanism 3 is not limited to an L-shape; it can also be U-shaped. However, it is necessary to ensure that there is at least one horizontal plate segment 31 for connecting the test bench 1 and at least one vertical plate segment 30 for clamping the battery cell 5.

[0030] See Figure 2 Furthermore, to ensure the stability and rigidity of the clamping mechanism 3, the thickness of the insulating plate 2 is [missing information]. d 1, d 1 ≥ 5mm; The height of clamping mechanism 3 must meet the following formula: H≥ h The clamping mechanism 3 has a height of [missing information]. H The height of cell 5 is h This ensures that the battery cell 5 and the clamping mechanism 3 have a sufficiently large contact surface, preventing bending deformation during ball impact testing.

[0031] The thickness of the horizontal section 31 must meet the following formula: d 3 ≥1.5d 2, of which, the longitudinal plate section has a thickness of 30 mm. d 2. The thickness of the horizontal plate section 31 is d 3. The thickness of the test stage must meet the following formula: d 4 ≥1.5d 3, of which, the thickness of the horizontal plate segment 31 is d 3. The thickness of the test stage is d4; The reason for this design is that, in the ball impact test, the ball is struck downwards from above the cell 5 through a 30mm ball head. Therefore, in the horizontal direction of the entire fixture, it mainly serves a clamping function to prevent deformation and displacement during the ball impact. In the vertical direction of the entire fixture, it is necessary to ensure sufficient strength to not only provide the support required for clamping, but also to prevent overall deformation during the ball impact. Therefore, it is necessary to ensure that the longitudinal plate section 30, the transverse plate section 31, and the test platform have a sufficiently high thickness ratio.

[0032] The clamping fixture is used for the 5-ball impact test of the battery cell as follows: First, preparatory work is required; specifically, the number of battery cells 5 to be tested is confirmed, and then an insulation board 2 of suitable size is matched.

[0033] Then, the clamping mechanism 3 clamps; specifically, the insulating plate 2 is placed on the test bench 1, and the battery cell 5 is placed on the insulating plate 2. It is necessary to ensure that the assembly is carried out according to the actual assembly gap and connection relationship of the module battery cell 5, that is, including the busbar; the clamping mechanism 3 is adjusted so that the longitudinal plate section 30 abuts against both sides of the battery cell 5, and then locked by the bolts 4.

[0034] Finally, the ball impact test is completed. Cell 5 needs to be placed upside down, i.e., with the ball impact position facing down, and left to stand for 2 hours. Check for electrolyte leakage.

[0035] In this embodiment, firstly, by setting a clamping fixture, different numbers of battery cells 5 can be clamped, which facilitates the ball impact test; secondly, by setting an insulating plate 2, the test platform 1 and the battery cell 5 can be isolated and insulated when spark discharge occurs during the ball impact test; then, by ensuring the height ratio of the clamping mechanism 3 to the insulating plate 2, and the thickness ratio of the longitudinal plate section 30 to the transverse plate section 31 and the test platform 1, not only is the clamping stability of the clamping mechanism 3 guaranteed, but also good strength support is ensured during the ball impact test to prevent deformation.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A clamping fixture, characterized in that, It includes a test platform, a clamping mechanism, and a connecting mechanism; a set of clamping mechanisms are symmetrically arranged on the test platform, and the clamping mechanisms are locked to the test platform through the connecting mechanism. The clamping mechanisms and the test platform enclose a space, and the thickness of the test platform is greater than the thickness of the clamping mechanism.

2. The clamping fixture according to claim 1, characterized in that, The clamping mechanism includes a horizontal plate section and a vertical plate section. The horizontal plate section fits into the test platform and is locked to each other by a connecting mechanism. The vertical plate section forms the inner wall of the accommodating space.

3. The clamping fixture according to claim 2, characterized in that, The thickness of the horizontal plate section must meet the following formula: d 3 ≥1.5d 2 The thickness of the longitudinal plate section is d 2. The thickness of the horizontal plate section is d 3.

4. The clamping fixture according to claim 2, characterized in that, The thickness of the test stage must meet the following formula: d 4 ≥1.5d 3 The thickness of the horizontal plate section is d 3. The thickness of the test stage is d 4.

5. The clamping fixture according to claim 2, characterized in that, It also includes insulating buffers, which are installed on the surface of the longitudinal plate section facing the accommodating space.

6. The clamping fixture according to claim 5, characterized in that, The insulating buffer is made of aerogel or MPP.

7. The clamping fixture according to claim 1, characterized in that, It also includes an insulating board, which is arranged at the bottom of the accommodating space.

8. The clamping fixture according to claim 7, characterized in that, The thickness of the insulating board is d 1, d1≥5mm.

9. The clamping fixture according to claim 2, characterized in that, The connecting mechanism is a bolt. A through hole is formed on the horizontal plate section, and several screw holes are correspondingly opened on the test platform. The screw holes are arranged along the length of the test platform, and the bolts pass through the through hole and engage with the corresponding screw holes.

10. The clamping fixture according to claim 2, characterized in that, The clamping mechanism has an L-shaped plate structure, with the horizontal part of the L-shaped plate being the transverse plate section and the vertical part being the longitudinal plate section.

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