Tool clamp for testing welding seam strength of lithium battery cover plate

Abstract

The invention discloses a tool clamp for testing the welding seam strength of a lithium battery cover plate, and relates to the technical field of welding seam strength testing, and the tool clamp comprises an adjustable clamping assembly which is used for clamping the testing cover plate and keeping the testing cover plate stable in the testing process; the supporting base assembly is fixed on the testing platform and prevents the testing cover plate from deforming or loosening in the stress process by limiting the relative movement of the adjustable clamping assembly; the supporting part is used for fixing the relative position of the adjustable clamping assembly and the supporting base assembly and providing position adjustment in the clamping process so as to adapt to test cover plates of different sizes or shapes; according to the invention, through cooperation of the adjustable clamping assembly and the supporting base assembly, adaptation and fixation of different types of test cover plates are realized so as to meet mechanical performance test requirements under different test conditions. In the operation process, the clamping operation is simplified, and the test result is more accurate and reliable due to uniform clamping and stable supporting.

Description

Technical Field

[0001] The invention relates to the technical field of weld strength testing, and in particular to a tooling fixture for testing the weld strength of a lithium battery cover. Background Art

[0002] As the application of lithium batteries continues to expand, the requirements for their safety and durability are gradually increasing, especially in the fields of electric vehicles, portable electronic devices, etc., which put forward strict requirements for the strength test of the weld seam of lithium battery cover. The strength of the weld seam of the lithium battery cover directly affects the sealing performance and safety of the battery. Therefore, it is particularly important to perform reliable tensile testing on the cover weld seam. In this type of test, a special fixture is required to ensure stability and accuracy during the test.

[0003] The current fixture design for lithium battery cover weld strength testing on the market is relatively simple, usually divided into only two basic clamping methods: upper and lower clamping or left and right clamping. This single structural design is difficult to meet the weld strength test requirements of different cover plates, especially for cover plate samples of different thicknesses and shapes, the existing fixture has many deficiencies in adaptability and stability. Specifically, the existing technology has defects and deficiencies in the following aspects: 1. Due to the differences in material, thickness and structure of the cover plate, the existing fixture design is difficult to adapt to various types of cover plate samples. The single clamping method and size restrictions result in the fixture only being able to fix a specific type of cover plate sample. For covers of different specifications, the fixture needs to be redesigned and customized, which not only increases the experimental cost, but also reduces the test efficiency. 2. The existing fixture is prone to uneven pressure on the cover plate during the clamping process, especially in high-strength tensile tests. The structure of the fixture lacks effective support for the cover plate weld area, which may cause the test cover plate to deform, thereby affecting the accuracy of the test results. Due to the sensitivity of the cover plate weld, this uneven clamping method cannot provide consistent test conditions. 3. Existing fixtures lack the ability to flexibly adjust the clamping position. Once clamped, it is difficult to effectively adjust the clamping force and position, which is particularly inconvenient during the experiment. When the experimental requirements change or the size of the test sample is different, traditional fixtures are difficult to adjust quickly to adapt to new test requirements. 4. In high-strength tensile tests, the base or support components of traditional fixtures are not stable enough, especially during the force process, which is prone to relative slippage and cannot effectively limit the movement of the clamping components, causing the test object to loosen under force, affecting the reliability of the test data.

[0004] In order to solve the above problems, some existing technologies try to adjust the clamping effect by using devices such as cylinders and hooks. For example, CN218629290U discloses a lithium battery cover plate tension test device. The device pushes the clamping plate to move left and right through the telescopic cylinders on both sides to adjust the spacing between the clamping plates. Although this technology can achieve a certain degree of adjustment, its clamping method is limited to lateral clamping, and the stable support for the cover plate is insufficient, making it difficult to effectively solve the problems of cover plate deformation and test errors. In addition, since the device is relatively complex and difficult to operate, it affects the actual test efficiency.

[0005] In summary, the existing fixtures for testing lithium battery cover plates have the following main deficiencies: 1. Insufficient adaptability, which makes it difficult to meet the testing requirements of various cover plates; 2. The clamping method is single and uneven, which easily causes deformation of the test object; 3. Lack of flexible adjustment ability, inconvenient operation, and difficulty in quickly adapting to different experimental requirements; 4. Unstable structure, which makes the clamping components easy to loosen during the test, affecting the test accuracy. Therefore, it is urgent for technicians in this field to design a new type of fixture for testing battery cover plates. Summary of the invention

[0006] The problem to be solved by the present invention is the technical problems that the existing tooling and fixture for testing lithium battery cover plates have insufficient adaptability, a single and uneven clamping method, a lack of flexible adjustment capability, and an unstable structure that affects the test accuracy. The present invention provides a tooling and fixture for testing the weld strength of lithium battery cover plates that enhances the adaptability of the fixture, improves the uniformity and stability of the clamping, ensures the impact resistance of the fixture under high-intensity testing, and makes the entire operation process more convenient and efficient, thereby significantly improving the accuracy and efficiency of the weld strength test of lithium battery cover plates.

[0007] In order to solve the above problems, the present invention provides a fixture for testing the weld strength of a lithium battery cover plate, the fixture is installed on a workbench of a tensile testing machine, and the fixture includes: An adjustable clamping assembly to hold the test cover and keep it stable during testing; The support base assembly is fixed on the test platform and prevents the test cover plate from being deformed or loosened during the force application process by limiting the relative movement of the adjustable clamping assembly; A support member for fixing the relative positions of the adjustable clamping assembly and the support base assembly and providing position adjustment during the clamping process to accommodate test cover plates of different sizes or shapes; The fixture can adapt to and fix different types of test covers through the cooperation of the adjustable clamping assembly and the supporting base assembly to meet the mechanical performance testing requirements under different test conditions.

[0008] Preferably, the adjustable clamping assembly includes an upper cover plate and a lower clamping plate, which are adjusted by tightening a handle so that the spacing between the upper cover plate and the lower clamping plate can be flexibly adjusted according to the thickness of the test cover plate, so that the fixture can flexibly adapt to cover plate samples of different thicknesses, thereby improving adaptability. This not only improves test efficiency, but also significantly reduces test costs, and is suitable for strength testing requirements of diversified cover plates.

[0009] Preferably, the tightening handle passes through the opening of the upper cover plate and is threaded downwardly to be tightened into the threaded hole formed in the lower clamping plate, thereby fitting and clamping the upper cover plate and the lower clamping plate. The tightening handle passes through the opening of the upper cover plate and is threadedly tightened into the threaded hole formed in the lower clamping plate, thereby achieving stable clamping of the upper cover plate and the lower clamping plate. The upper and lower clamping plates can be firmly clamped through a simple tightening operation, which is not only convenient and quick to operate, but also can ensure the stability of clamping, effectively avoiding the problem of loosening of the cover plate during the test, and ensuring the stability and reliability of the test results.

[0010] Preferably, the supporting base assembly includes a base connecting plate and a supporting block arranged on the upper end of the base connecting plate. Through the combination of the base connecting plate and the supporting block, the clamp is more stable under stress and can provide solid support for the entire clamp, thereby greatly improving the stability of the clamp during the test, avoiding slippage or shaking of traditional clamps due to unstable base, and effectively improving the accuracy of test data.

[0011] Preferably, the support component includes a set of bolt fasteners and set screws, and the bolt fasteners sequentially pass through the connection holes on the upper cover plate, the support block and the base connection plate to fix them together. The bolt fasteners make the entire fixture structure more stable, ensuring that the clamping assembly does not loosen during the test. The reliable fixation of the support component provides a solid foundation for high-strength testing, avoids test errors caused by looseness, and also prolongs the service life of the fixture.

[0012] Preferably, the side end of the lower clamping plate is connected to the support block to form a chimeric structure. The chimeric structure makes the clamp more stable during the force application process, avoids relative displacement during lateral force application, thereby ensuring the accuracy and consistency of the test, and is particularly suitable for the needs of high-strength tensile testing.

[0013] Preferably, a dovetail groove is provided at the side edge of the lower clamping plate, and a dovetail block protruding outward is provided at the side end of the support block. The dovetail block is engaged with the dovetail groove, and the set screw is screwed into the clamp hole at the front end of the lower clamping plate. The engagement of the dovetail structure greatly enhances the connection strength between the lower clamping plate and the support block, making it difficult for the clamp to slip or dislocate during high-strength tensile tests. The impact resistance and overall rigidity of the clamp are effectively enhanced, ensuring the stability of the test cover under high-strength loads, thereby improving the reliability of the test results.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: The fixture of the present invention adopts an adjustable clamping assembly, and by adjusting the spacing between the clamping plates up and down, the fixture can adapt to lithium battery cover plates of different thicknesses and sizes. This solves the problem of insufficient adaptability of existing fixtures, can adapt to cover plates of different materials and specifications, reduces the need for customizing fixtures of different specifications, improves test efficiency and reduces experimental costs.

[0015] The present invention realizes uniform clamping of the cover plate through the upper cover plate and the lower clamping plate, and the supporting base assembly provides effective support for the weld area, avoiding the deformation problem of traditional clamps in high-strength tensile tests, improving the accuracy and reliability of the test, especially in high-strength tests, and can provide consistent test conditions to ensure the accuracy of measurement data.

[0016] The clamping assembly and the supporting component of the present invention can be flexibly adjusted according to the size and shape of the test sample, so that the experimenter can quickly adapt to different experimental requirements. By tightening the handle and the supporting component, the user can conveniently adjust the clamping force and position during the experiment, which improves the convenience of operation and enables the clamp to quickly respond to different experimental requirements.

[0017] The supporting base assembly of the present invention adopts the combination of the base connecting plate and the supporting block to provide a stable support, so that the fixture will not slip during the high-strength tensile test. The interlocking structure formed between the lower clamping plate and the supporting block, the cooperation of the dovetail groove and the dovetail-shaped clamping block further enhances the stability of the fixture, effectively prevents the test object from loosening during the force-bearing process, and ensures the stability and reliability of the test data.

[0018] The fixture of the present invention has a simple structure, and the clamping adjustment can be quickly completed by tightening the handle, which significantly reduces the difficulty of operation compared to the complicated operations of the cylinder, hook, etc. in the prior art. At the same time, the fixture is easy to install and can be quickly fixed on the workbench of the tensile testing machine, which improves the test efficiency and is suitable for the application requirements of batch testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a schematic diagram of the assembly of the tooling fixture for testing the weld strength of the lithium battery cover plate of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure of the tooling fixture for testing the weld strength of the lithium battery cover plate of the present invention.

[0021] Figure 3 A schematic diagram of the structure of the support block.

[0022] In the figure: 1-test cover plate, 2-adjustable clamping assembly, 201-upper cover plate, 202-lower clamping plate, 203-tightening handle, 204-dovetail groove, 3-support base assembly, 301-base connecting plate, 302-support block, 303-dovetail clamping block, 4-support component, 401-bolt fastener, 402-fastening screw. DETAILED DESCRIPTION

[0023] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments.

[0024] Reference Figure 1-Figure 3 As shown, a fixture for testing the weld strength of a lithium battery cover plate is installed on a workbench of a tensile testing machine, and the fixture includes: an adjustable clamping assembly 2, used to clamp a test cover plate 1 and keep it stable during the test; a support base assembly 3, fixed on the test platform and preventing the test cover plate 1 from deforming or loosening during the force application process by limiting the relative movement of the adjustable clamping assembly 2; a support component 4, used to fix the relative position of the adjustable clamping assembly 2 and the support base assembly 3, and provide position adjustment during the clamping process to accommodate test covers of different sizes or shapes; wherein, the fixture achieves adaptation and fixation of different types of test cover plates 1 through the cooperation of the adjustable clamping assembly 2 and the support base assembly 3 to meet the mechanical performance testing requirements under different test conditions.

[0025] Reference Figure 1-Figure 2 As shown, the adjustable clamping assembly 2 includes an upper cover plate 201 and a lower clamping plate 202, which are adjusted by tightening the handle so that the spacing between the upper cover plate and the lower clamping plate can be flexibly adjusted according to the thickness of the test cover plate, so that the fixture can flexibly adapt to cover plate samples of different thicknesses, thereby improving adaptability. This not only improves the test efficiency, but also significantly reduces the test cost, and is suitable for the strength test requirements of diversified cover plates.

[0026] The tightening handle 203 passes through the opening of the upper cover plate 201 and is screwed downward into the threaded hole formed on the lower clamping plate 202, thereby fitting and clamping the upper cover plate 201 and the lower clamping plate 202. The tightening handle passes through the opening of the upper cover plate and is screwed into the threaded hole of the lower clamping plate, thereby achieving stable clamping of the upper cover plate and the lower clamping plate. The upper and lower clamping plates can be firmly clamped through a simple tightening operation, which is not only convenient and quick to operate, but also can ensure the stability of clamping, effectively avoiding the problem of loosening of the cover plate during the test, and ensuring the stability and reliability of the test results.

[0027] The supporting base assembly 3 includes a base connecting plate 301 and a supporting block 302 arranged on the upper end of the base connecting plate 301. Through the combination of the base connecting plate and the supporting block, the clamp is more stable under stress and can provide solid support for the entire clamp, thereby greatly improving the stability of the clamp during the test, avoiding the slippage or shaking of the traditional clamp due to the unstable base, and effectively improving the accuracy of the test data.

[0028] The support component 4 includes a set of bolt fasteners 401 and a set screw 402. The bolt fasteners 401 pass through the connection holes on the upper cover plate 201, the support block 302 and the base connection plate 301 in sequence to fix them together. The bolt fasteners make the entire fixture structure more stable, ensuring that the clamping components do not loosen during the test. The reliable fixation of the support component provides a solid foundation for high-strength testing, avoids test errors caused by looseness, and also prolongs the service life of the fixture.

[0029] The side end of the lower clamping plate 202 is connected to the support block 302 to form a chimeric structure. The chimeric structure makes the fixture more stable during the force application process, avoids relative displacement during lateral force application, thereby ensuring the accuracy and consistency of the test, and is particularly suitable for the needs of high-strength tensile testing.

[0030] The lower clamping plate 202 has a dovetail groove 204 at the side edge, and the support block 302 has a dovetail block 303 protruding outward at the side end. The dovetail block 303 is engaged with the dovetail groove 204, and the set screw 402 is screwed into the clamp hole at the front end of the lower clamping plate 202. The engagement of the dovetail structure greatly enhances the connection strength between the lower clamping plate and the support block, making it difficult for the fixture to slip or dislocate during high-strength tensile tests. The impact resistance and overall rigidity of the fixture are effectively enhanced, ensuring the stability of the test cover under high-strength loads, thereby improving the reliability of the test results.

[0031] In order to facilitate understanding of the above technical solutions of the present invention, the above technical solutions of the present invention are described in detail below through specific usage methods.

[0032] The specific working process is as follows: First, fix the support base assembly 3 of the fixture on the workbench of the tensile testing machine to ensure that the base connecting plate 301 is firmly connected to the workbench to prevent the fixture from being displaced or loosened during the test. Next, place the lithium battery cover plate 1 to be tested into the adjustable clamping assembly 2 so that it is located between the upper cover plate 201 and the lower clamping plate 202. According to the size and thickness of the cover plate 1 to be tested, adjust the spacing between the upper cover plate 201 and the lower clamping plate 202 of the adjustable clamping assembly 2. By tightening the handle 203, it can be screwed into the threaded hole of the lower clamping plate 202, so that according to the thickness of the cover plate 1 to be tested, the upper cover plate 201 and the lower clamping plate 202 are adjusted to a suitable spacing to adapt to covers of different thicknesses. During the clamping process, adjust the clamping force by tightening the handle 203 to ensure uniform clamping and avoid loosening during the test. Next, ensure that the dovetail groove 204 at the side end of the lower clamping plate 202 and the support block 302 is engaged with the dovetail block 303. The engaged structure can effectively prevent the slippage or dislocation of the fixture during the high-strength tensile test. Tighten the clamp hole at the front end of the lower clamping plate by tightening the screw 402. After the test cover plate 1 is clamped and ensured to be fixed correctly, start the tensile testing machine, gradually increase the tensile force, and perform strength testing on the weld area of ​​the cover plate. During the tensile test, the specific value of the weld strength of the lower cover plate is recorded by the testing machine, and observe whether the cover plate is deformed or falls off during the force process. Due to the stable design and effective support of this fixture, the reliability of the weld area during the test is ensured. After the test is completed, loosen the tightening handle 203 to increase the distance between the upper cover plate 201 and the lower clamping plate 202 so that the cover plate can be removed from the fixture. According to the needs of the next test, continue to adjust the fixture to adapt to the new test cover plate specifications, or store the fixture properly after completing the batch test.

[0033] The lithium battery cover weld strength test fixture of the present invention can adapt to cover samples of various specifications through the cooperation of the adjustable clamping assembly and the supporting base assembly. During operation, not only the clamping operation is simplified, but also the test results are more accurate and reliable due to the uniform clamping and stable support, which is suitable for batch testing.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features of the invention described herein.

Claims

1. A fixture for testing the weld strength of a lithium battery cover, the fixture being installed on a workbench of a tensile testing machine, characterized in that: The fixture comprises: An adjustable clamping assembly (2) for clamping the test cover plate (1) and keeping it stable during the test; A support base assembly (3) is fixed on the test platform and prevents the test cover plate (1) from deforming or loosening during the force application process by limiting the relative movement of the adjustable clamping assembly (2); A support component (4) for fixing the relative position of the adjustable clamping assembly (2) and the support base assembly (3) and providing position adjustment during the clamping process to accommodate test cover plates of different sizes or shapes; The fixture achieves adaptation and fixation of different types of test cover plates (1) through the cooperation of the adjustable clamping assembly (2) and the supporting base assembly (3).

2. The fixture for testing the weld strength of a lithium battery cover according to claim 1, characterized in that: The adjustable clamping assembly (2) comprises an upper cover plate (201) and a lower clamping plate (202); the upper cover plate (201) is adjusted by tightening a handle (203), so that the spacing between the upper cover plate (201) and the lower clamping plate (202) can be adjusted according to the thickness of the test cover plate (1).

3. The fixture for testing the weld strength of a lithium battery cover according to claim 2, characterized in that: The tightening handle (203) passes through the opening of the upper cover plate (201) and is screwed downwardly into the threaded hole opened on the lower clamping plate (202), thereby adapting and clamping the upper cover plate (201) and the lower clamping plate (202).

4. The fixture for testing the weld strength of a lithium battery cover according to claim 2, characterized in that: The supporting base assembly (3) comprises a base connecting plate (301) and a supporting block (302) arranged at the upper end of the base connecting plate (301).

5. The fixture for testing the weld strength of a lithium battery cover according to claim 4, characterized in that: The support component (4) comprises a group of bolt fasteners (401) and set screws (402), wherein the bolt fasteners (401) pass through connection holes on the upper cover plate (201), the support block (302) and the base connection plate (301) in sequence, thereby fixing the upper cover plate (201), the support block (302) and the base connection plate (301).

6. The fixture for testing the weld strength of a lithium battery cover according to claim 5, characterized in that: The side end of the lower clamping plate (202) is connected to the support block (302) to form a chimeric structure.

7. The fixture for testing the weld strength of a lithium battery cover according to claim 6, characterized in that: A dovetail groove (204) is provided at the side edge of the lower clamping plate (202), and a dovetail-shaped clamping block (303) protruding outward is provided at the side end of the support block (302). The dovetail-shaped clamping block (303) is engaged with the dovetail groove (204), and a set screw (402) is screwed into a clamping hole provided at the front end of the lower clamping plate (202).

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