A tooling fixture for lithium battery testing equipment

Abstract

The present invention discloses a fixture for lithium battery testing equipment, which relates to the technical field of lithium battery testing, including a base; a driving mechanism, which is installed on the base, the driving mechanism is used to drive the left worktable and the right worktable to approach or move away from each other in the horizontal direction, and the moving direction of the left worktable or the right worktable is defined as the left and right direction; the left worktable is used to fix the lithium battery, and the left worktable includes a left slider installed on the driving mechanism; the beneficial effect is that the fixture improves the items that can be detected by the lithium battery and has better adaptability. In addition to drop tests and vibration tests, the present invention can complete various conventional test items such as extrusion, acupuncture, impact, bending and twisting, and stretching, which is conducive to enterprises to conduct more comprehensive testing of the lithium batteries produced.

Description

Technical Field

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

[0002] Lithium battery is a rechargeable battery that is widely used in portable electronic devices, electric vehicles, energy storage systems and other fields due to its advantages such as high energy density, long cycle life and low memory effect.

[0003] Prismatic lithium batteries are lithium-ion batteries with a rectangular or square shape. Prismatic batteries are usually more efficient than cylindrical batteries in terms of space utilization, especially in situations where large areas need to be covered. Therefore, they are widely used in electric vehicles, electric cars and other fields.

[0004] In addition to circuit testing, lithium batteries also need to undergo mechanical performance testing. Mechanical performance testing of lithium batteries (and their internal components) is essential to ensure their safety, reliability and durability in various use environments and conditions. Mechanical performance testing is to evaluate whether the battery will cause internal short circuits, thermal runaway, explosions or fires when it is physically damaged by simulating mechanical stresses under real use or extreme conditions, such as extrusion, impact, vibration, drop, puncture, bending or twisting, scratches and wear resistance. This is essential to ensure user safety and prevent battery-induced disasters. In addition, tensile and compression tests are required to obtain performance indicators such as tensile strength, area reduction, elongation, yield strength, strength, and plasticity of lithium battery components.

[0005] In addition to finished lithium batteries, internal components of lithium batteries, especially key components, need to be tested one by one. This results in relatively more testing items. Mechanical performance testing requires the use of multiple devices and supporting tooling fixtures. On the one hand, multiple testing equipment takes up more space. On the other hand, the testing equipment and supporting fixtures also increase the investment cost, which is not conducive to some small and medium-sized enterprises to conduct comprehensive mechanical performance testing on lithium batteries.

[0006] The utility model patent with publication number CN209027909U discloses an extrusion test fixture based on variable-size square-shell lithium batteries. This solution can tighten and fix square-shell lithium-ion batteries of all sizes within a certain length, width, and height range to conduct extrusion experiments. It is more practical and speeds up the experimental cycle by reducing the tooling production cycle. It also greatly reduces the tooling production cost, product development cycle, and tooling storage and custody costs for enterprises.

[0007] However, this solution also has certain limitations. The national standard (GB / T 31486-2015) stipulates that in the extrusion test, the battery is placed between two parallel extrusion plates, and it is usually required to apply extrusion at the weakest point of the battery or in a predetermined direction. It is required to apply an extrusion force of 13 kN to the battery and maintain it for 1 minute, or until the battery breaks. When testing the above-mentioned public technical solution, it is necessary to set up additional support at the bottom of the lithium battery. And the fixture detection items are relatively simple.

[0008] In order to improve the inspection items of the fixture, a multifunctional lithium battery test fixture has appeared in the prior art. By clamping and fixing the two ends of the lithium battery, the lithium battery can be tested for various items such as extrusion, impact, acupuncture, and stretching. However, new problems were found in the test. First, since the gap between the lithium battery workpiece to be tested and the base is relatively small after installation, the load-bearing plate under the lithium battery is mostly adjusted manually. During the extrusion test, the load-bearing plate is adjusted to fit the bottom of the lithium battery to support the lithium battery. During the bending test, the load-bearing plate is lowered to separate the load-bearing plate from the lithium battery. During the test, the load-bearing plate needs to be manually adjusted many times, which reduces the inspection efficiency. Secondly, in the tensile test (this test is mainly for the internal components of the lithium battery), the lithium battery components to be tested are fixed on the two workpiece tables by the pressure plate and bolts. Due to the different strengths of different operators to tighten the bolts, the lithium battery components may become loose during the test. When the loosening offset is too large, it can be directly observed by the naked eye and retested. However, some offsets are small and difficult to observe by the naked eye, resulting in possible deviations in the test results. Summary of the invention

[0009] The purpose of the present invention is to provide a lithium battery testing equipment fixture in order to solve the above-mentioned problem.

[0010] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0011] A lithium battery testing equipment fixture, comprising:

[0012] Base;

[0013] A driving mechanism is installed on the base, and is used to drive the left workpiece table and the right workpiece table to move closer to or farther from each other in a horizontal direction, and the moving direction of the left workpiece table or the right workpiece table is defined as a left-right direction;

[0014] A left workpiece table, which is used to fix the lithium battery, comprises a left slider mounted on the driving mechanism, the left slider is bolted to a left mounting table, a left workpiece slot for placing the lithium battery is provided on the left mounting table, a left displacement sensor for detecting the displacement of the lithium battery is installed on the side of the left workpiece slot away from the right workpiece table, and a left pressure plate for fixing the lithium battery is provided above the left mounting table;

[0015] A right workpiece table, which is used to fix the lithium battery, comprises a right slider mounted on the driving mechanism, a right mounting table is provided on the right slider, a right workpiece slot for placing the lithium battery is provided on the right mounting table, a right displacement sensor for detecting the displacement of the lithium battery is installed on the side of the right workpiece slot away from the left workpiece table, and a right pressure plate for fixing the lithium battery is provided above the right mounting table;

[0016] A support mechanism is arranged between the left workpiece platform and the right workpiece platform, and is used to support the bottom of the lithium battery. The support mechanism includes a load-bearing plate that can be lifted up and down, and a lifting structure for driving the load-bearing plate to be lifted up and down is provided at the bottom of the load-bearing plate;

[0017] A pressure sensor, one end of which is connected to the left workpiece platform, and the other end of which is connected to the right workpiece platform.

[0018] By adopting the above technical solution, the clamping steps are simplified and the detection accuracy is improved. The liftable support mechanism can quickly adjust the height of the load-bearing plate and is easy to adjust. By setting the left displacement sensor and the right displacement sensor, when performing the tensile test, the left and right ends of the lithium battery component are in contact with the left displacement sensor and the right displacement sensor respectively. If the position of the lithium battery component shifts during the test, the left displacement sensor and the right displacement sensor can record the offset and transmit it to an external computer or industrial computer, which is conducive to controlling variables and improving detection accuracy.

[0019] As a further improvement, bosses are provided at both ends of the top of the base.

[0020] By adopting the above technical solution, it is convenient to install various components of the driving mechanism.

[0021] As a further improvement, the driving mechanism includes a double-headed screw arranged between two bosses, and the two ends of the double-headed screw are respectively connected to the two bosses through bearings, and a driving motor for driving the double-headed screw to rotate is installed on one of the bosses, and guide rods for guiding are provided on the front and rear sides of the double-headed screw, and the two ends of the guide rod are respectively fixedly connected to the two bosses; the left slider and the right slider are both connected to the double-headed screw through threads.

[0022] By adopting the above technical solution, the distance between the left worktable and the right worktable can be accurately controlled, which is convenient for adapting to different types of lithium batteries, and can also be used for stretching and other tests. The double-headed screw has two sections of threads, and the thread directions of the two sections are opposite. When the driving motor drives the double-headed screw to rotate forward or reverse, the left worktable and the right worktable move closer to or farther away from each other.

[0023] As a further improvement, a load-bearing platform is fixedly installed on the top of the right slider, and the load-bearing platform is arranged on the side of the right mounting platform away from the left workpiece platform. The right mounting platform is rotatably connected with the load-bearing platform through a rotating shaft. A limit pin arranged in the horizontal direction is also arranged on the load-bearing platform, and a blind hole cooperating with the limit pin is opened on the right mounting platform;

[0024] A gap is provided between the right mounting platform and the right sliding block, so that after the limiting pin is separated from the blind hole, the right mounting platform can rotate around the rotating shaft.

[0025] By adopting the above technical solution, a distortion test can be performed on a thin lithium battery or lithium battery parts. When the limit pin is removed, the right mounting platform is released from the limit, and at this time, the front end or rear end of the right mounting platform is pressed down by the test equipment, and the right mounting platform rotates around the rotation axis to complete the distortion test.

[0026] As a further improvement, a limiting plate is provided between the right mounting platform and the right sliding block to fill the gap between the right mounting platform and the right sliding block so as to improve the stability of the right mounting platform.

[0027] By adopting the above technical solution, the shaft can be prevented from being bent and damaged during the test.

[0028] As a further improvement, a limit hole is further provided below the blind hole, the limit hole is connected to the blind hole, a limit shaft is slidably assembled in the limit hole, a spring is sleeved on the limit shaft, a sealing plate for limiting the limit shaft is screwed to the bottom of the limit hole, and a matching hole matching the limit shaft is provided on the top of the limit plate;

[0029] The end of the limit pin is a hemispherical structure or a conical structure, so that after the limit pin is inserted into the blind hole, the limit shaft is squeezed downward and snapped into the matching hole to prevent the limit plate from deflecting.

[0030] By adopting the above technical solution, the limiting plate can be quickly limited or released, simplifying the operation steps.

[0031] As a further improvement, a telescopic rod is fixedly connected to the bottom of the load-bearing plate, and the lifting structure includes two telescopic cylinders horizontally installed on the base. The two telescopic cylinders are symmetrically arranged along the front-to-back direction. The output shaft of the telescopic cylinder is fixedly connected to a support block, and a wedge block is provided on the top of the support block for driving the load-bearing plate to rise and fall.

[0032] By adopting the above technical solution, there is no need to manually adjust the height of the load-bearing plate, and the stability is good. Due to the limited distance between the lithium battery and the base during the test, and the influence of the driving mechanism, if a pneumatic lifting structure is adopted, only a small-sized cylinder can be used. The driving force provided by such a cylinder is relatively limited. When the hydraulic mechanism above the lithium battery applies a downward force, the load-bearing plate may deviate downward, and the cylinder is also prone to problems such as air tightness due to the large pressure, which leads to damage to the cylinder. Therefore, the load-bearing plate is currently mostly adjusted manually. Regarding this problem, the present invention realizes the lifting of the load-bearing plate by adopting a horizontally arranged telescopic cylinder and a wedge block structure. On the one hand, since the horizontal space is relatively large, a larger telescopic cylinder can be used for horizontal placement. On the other hand, when the test equipment applies downward pressure from above, the force applied by the wedge block is decomposed into a downward force and a horizontal force, thereby sharing the force that the telescopic cylinder needs to bear and improving the stability of the support mechanism.

[0033] As a further improvement, a left extension block is fixedly connected to the side surface of the left slider, a right extension block is fixedly connected to the side surface of the right slider, and the pressure sensors are fixedly connected to the left extension block and the right extension block respectively.

[0034] As a further improvement, an adjustment hole is provided on the right extension block, and the adjustment hole is a rectangular hole.

[0035] By adopting the above technical solution, it is convenient to adapt to different types of lithium batteries.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. This fixture increases the items that can be tested for lithium batteries and has better adaptability. In addition to drop tests and vibration tests, the present invention can complete various conventional testing items such as extrusion, acupuncture, impact, bending and twisting, and stretching, which is conducive to enterprises to conduct more comprehensive testing of the lithium batteries they produce.

[0038] 2. By setting the left displacement sensor and the right displacement sensor, the displacement parameters of the lithium battery or its internal components during the test can be recorded in detail, thereby improving the accuracy of the test results.

[0039] 3. The right mounting platform of the present invention is connected to the load-bearing platform through a rotating shaft. In the torsion test, there is no need to add torsion test equipment. It is only necessary to use the existing test equipment to apply a downward force at the front or rear end of the right mounting platform to realize the rotation of the right mounting platform for the torsion test.

[0040] 4. The support mechanism of the present invention adopts a horizontally arranged telescopic cylinder to realize the lifting and lowering of the load-bearing plate, which is not only more convenient to operate but also has good stability, greatly reducing the failure rate of the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0042] Figure 1 It is a three-dimensional diagram of the fixture of the lithium battery testing equipment of the present invention.

[0043] Figure 2 It is a top view of the fixture of the lithium battery testing equipment of the present invention.

[0044] Figure 3 yes Figure 2 AA cross-section diagram.

[0045] Figure 4 It is a partial structural schematic diagram of the tooling fixture of the lithium battery testing equipment of the present invention.

[0046] The following are the descriptions of the reference numerals:

[0047] 100, base; 110, boss; 200, drive mechanism; 210, drive motor; 220, double-headed screw; 230, guide rod; 300, left workpiece table; 310, left mounting table; 311, left workpiece slot; 320, left pressure plate; 330, left extension block; 340, left displacement sensor; 350, left slider; 400, support mechanism; 410, load-bearing plate; 420, support block; 421, wedge block; 430, telescopic gas Cylinder; 440, telescopic rod; 500, right workpiece platform; 510, right pressure plate; 520, right mounting platform; 521, right workpiece slot; 522, limit hole; 523, limit shaft; 524, spring; 525, sealing plate; 530, load-bearing platform; 540, rotating shaft; 550, limit pin; 560, right extension block; 561, adjustment hole; 570, limit plate; 580, right displacement sensor; 590, right slider; 600, pressure sensor. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0049] In the existing technology, there are many test items for lithium batteries and their internal key components. If a relatively comprehensive test is to be carried out, a variety of testing equipment and supporting fixtures are required. For small and medium-sized enterprises, the investment is relatively large. If the number of test items is reduced, it may have some adverse effects on both early research and development and product quality inspection.

[0050] In view of the above problems, the present invention drives the left workpiece table and the right workpiece table to move closer to or away from each other by setting a driving mechanism. On the one hand, it is conducive to adapting different lithium batteries, and on the other hand, it can also perform tests such as tension and compression. Most of the components are connected in a detachable manner. For example, the left mounting table is connected to the left slider by bolts. If some lithium batteries cannot be adapted, the corresponding left mounting table can be replaced, and the right mounting table is the same. The right mounting table is connected to the load-bearing platform through a rotating shaft. In the torsion test, there is no need to add torsion test equipment. It is only necessary to use the existing test equipment to apply downward force at the front or rear end of the right mounting table to realize the rotation of the right mounting table for torsion test; it is very convenient to release the limit of the right mounting table, and quick switching can be achieved. The support mechanism adopts a horizontally arranged telescopic cylinder to drive the load-bearing plate to rise and fall, which has a good support effect and avoids the load-bearing plate from moving down during the test and affecting the test results.

[0051] The fixture of the present invention reduces the cost of comprehensive testing by improving test accuracy, test item types, fixture stability, lithium battery compatibility, etc., which is beneficial to the company's product development and quality control.

[0052] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0053] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0054] like Figure 1-Figure 4 As shown, the fixture of the lithium battery testing equipment includes a base 100, a driving mechanism 200, a left workpiece table 300, a right workpiece table 500, a supporting mechanism 400 and a pressure sensor 600. It should be noted that in this embodiment, the left workpiece table 300 and the right workpiece table 500 are only relative.

[0055] like Figure 1-Figure 3 As shown, the base 100 is a rectangular metal plate, and bosses 110 are provided at both ends of the top of the base 100, and the bosses 110 are fixed to the base 100 by bolts;

[0056] like Figure 1-Figure 3As shown, a driving mechanism 200 is installed on the base 100, and the driving mechanism 200 is used to drive the left workpiece stage 300 and the right workpiece stage 500 to move closer to or away from each other in the horizontal direction, and the moving direction of the left workpiece stage 300 or the right workpiece stage 500 is defined as the left and right direction; the driving mechanism 200 includes a double-headed screw 220 arranged between the two bosses 110, and the double-headed screw 220 is a prior art, which has two sections of threads in opposite directions; the two ends of the double-headed screw 220 are respectively connected to the two bosses 110 through Bearing connection, one of the bosses 110 is equipped with a driving motor 210 for driving the double-headed screw 220 to rotate, the driving motor 210 is a servo motor, the driving motor 210 and the double-headed screw 220 are meshed through gears, the boss 110 where the driving motor 210 is located is provided with a mounting groove, the top of the mounting groove is sealed with an inspection plate to avoid accidental contact with the gear; the front and rear sides of the double-headed screw 220 are provided with guide rods 230 for guiding, and the two ends of the guide rod 230 are fixedly connected to the two bosses 110 respectively.

[0057] The driving mechanism 200 can accurately control the distance between the left workpiece platform 300 and the right workpiece platform 500, so as to facilitate the adaptation to different types of lithium batteries and perform tests such as stretching.

[0058] The left workpiece stage 300 and the right workpiece stage 500 are both mounted on the driving mechanism 200 .

[0059] like Figure 1-Figure 3 As shown, the left workpiece platform 300 includes a left slider 350 installed on the driving mechanism 200, the left slider 350 is threadedly connected to the double-headed screw 220, and the left mounting platform 310 is bolted on the left slider 350. The left mounting platform 310 is provided with a left workpiece slot 311 for placing lithium batteries. The left workpiece slot 311 is convenient for positioning the lithium batteries. In other embodiments, it may not be provided; a left displacement sensor 340 for detecting the displacement of the lithium battery is installed on the side of the left workpiece slot 311 away from the right workpiece platform 500, and a left pressure plate 320 for fixing the lithium battery is provided above the left mounting platform 310. The left mounting platform 310 is also provided with a positioning groove that cooperates with the left pressure plate 320 to facilitate the positioning of the left pressure plate 320. The right mounting platform 520 described below is also provided with a positioning groove; the left pressure plate 320 is fixed to the left mounting platform 310 by butterfly bolts, so that the left pressure plate 320 can be easily removed. In this embodiment, the left displacement sensor 340 adopts a contact displacement sensor, which has high sensitivity and relatively low cost.

[0060] like Figure 1-Figure 3As shown, the right workpiece platform 500 includes a right slider 590 installed on the driving mechanism 200, the right slider 590 is connected to the double-headed screw 220 by threads, a load-bearing platform 530 is fixedly installed on the top of the right slider 590, the load-bearing platform 530 is arranged on the side of the right mounting platform 520 away from the left workpiece platform 300, and the right mounting platform 520 is arranged on the side of the load-bearing platform 530 close to the left workpiece platform 300, and the right mounting platform 520 and the load-bearing platform 530 are rotatably connected by a rotating shaft 540. The rotating shaft 540 is connected to the load-bearing platform 530 through a bearing, and the rotating shaft 540 is connected to the right mounting platform 520 through bolts, which facilitates the disassembly of the right mounting platform 520; a limit pin 550 is also arranged in the horizontal direction on the load-bearing platform 530, and a blind hole cooperating with the limit pin 550 is provided on the right mounting platform 520. In order to facilitate the fixing of the limit pin 550, in this embodiment, the limit pin 550 is provided with a small threaded section to facilitate the connection with the load-bearing platform 530 and prevent the limit pin 550 from loosening.

[0061] A right mounting platform 520 is provided on the right slider 590, and a right workpiece slot 521 for placing lithium batteries is provided on the right mounting platform 520. A right displacement sensor 580 for detecting displacement of lithium batteries is installed on the side of the right workpiece slot 521 away from the left workpiece platform 300, and a right pressure plate 510 for fixing lithium batteries is provided above the right mounting platform 520. The right displacement sensor 580 has the same structure as the left displacement sensor 340, but in order to avoid the rotating shaft 540, the right displacement sensor 580 should be located at the front or rear side of the rotating shaft 540.

[0062] In this embodiment, a gap is provided between the right mounting platform 520 and the right slider 590, so that after the stop pin 550 is separated from the blind hole, the right mounting platform 520 can rotate around the rotating shaft 540. In this way, a distortion test can be performed on a thin lithium battery or lithium battery component. When the stop pin 550 is removed, the right mounting platform 520 is released from the limit. At this time, the front end or rear end of the right mounting platform 520 is pressed down by the test equipment, and the right mounting platform 520 rotates around the rotating shaft 540 to complete the distortion test.

[0063] A limiting plate 570 is provided between the right mounting platform 520 and the right slider 590 to fill the gap between the right mounting platform 520 and the right slider 590 to improve the stability of the right mounting platform 520 and prevent the rotating shaft 540 from bending and being damaged during the test.

[0064] like Figure 4 As shown, a limit hole 522 is further provided below the blind hole, the limit hole 522 is communicated with the blind hole, a limit shaft 523 is slidably assembled in the limit hole 522, a spring 524 is sleeved on the limit shaft 523, a sealing plate 525 for limiting the limit shaft 523 is screwed to the bottom of the limit hole 522, and a matching hole matching the limit shaft 523 is provided on the top of the limit plate 570;

[0065] The end of the limit pin 550 is a hemispherical structure or a conical structure (or a truncated cone structure), so that after the limit pin 550 is inserted into the blind hole, the limit shaft 523 is squeezed downward and snapped into the matching hole to prevent the limit plate 570 from deflecting. With the above structure, the limit plate 570 can be quickly limited or released, simplifying the operation steps.

[0066] like Figure 1 and Figure 3 As shown, the support mechanism 400 is disposed between the left workpiece platform 300 and the right workpiece platform 500, and is used to support the bottom of the lithium battery. The support mechanism 400 includes a load-bearing plate 410 that can be lifted up and down, and a lifting structure for driving the load-bearing plate 410 to lift and lower is provided at the bottom of the load-bearing plate 410;

[0067] A telescopic rod 440 is fixedly connected to the bottom of the load-bearing plate 410. The telescopic rod 440 mainly plays a guiding role. A spring 524 can be arranged in the telescopic rod 440 to ensure that the load-bearing plate 410 is at the lowest end when not subject to external force. The lifting structure includes two telescopic cylinders 430 horizontally installed on the base 100. The two telescopic cylinders 430 are symmetrically arranged along the front and rear directions. The output shaft of the telescopic cylinder 430 is fixedly connected to the support block 420. A slide groove cooperating with the support block 420 is opened on the base 100. A wedge block 421 for driving the load-bearing plate 410 to rise and fall is provided on the top of the support block 420.

[0068] The support mechanism 400 does not need to manually adjust the height of the load-bearing plate 410, and has good stability. During the test, the distance between the lithium battery and the base 100 is limited, and the driving mechanism 200 is affected. If a pneumatic lifting structure is used, only a small-sized cylinder can be used. The driving force provided by such a cylinder is relatively limited. When the hydraulic mechanism above the lithium battery applies a downward force, the load-bearing plate 410 may deviate downward, and the cylinder is also prone to problems such as air tightness due to the high pressure, which may lead to damage to the cylinder. Therefore, the load-bearing plate 410 is currently mostly adjusted manually. Regarding this problem, the present invention realizes the lifting and lowering of the load-bearing plate 410 by adopting a horizontally arranged telescopic cylinder 430 and a wedge block 421 structure. On the one hand, since the space in the horizontal direction is relatively larger, a larger telescopic cylinder 430 can be used for horizontal placement. On the other hand, when the test equipment applies downward pressure from above, the force applied by the wedge block 421 is decomposed into a downward force and a horizontal force, thereby sharing the force that the telescopic cylinder 430 needs to bear, thereby improving the stability of the support mechanism 400.

[0069] In other embodiments, an inclined surface that cooperates with the wedge block 421 can be provided at the bottom of the load-bearing plate 410 to increase the contact area between the wedge block 421 and the load-bearing plate 410 and improve stability.

[0070] The pressure sensor 600 has one end connected to the left workpiece stage 300, and the other end connected to the right workpiece stage 500. In this embodiment, the left slider 350 is fixedly connected to the left extension block 330, and the right slider 590 is fixedly connected to the right extension block 560. The pressure sensor 600 is fixedly connected to the left extension block 330 and the right extension block 560 respectively. The right extension block 560 is provided with an adjustment hole 561, which is a rectangular hole, so as to facilitate the adaptation of lithium batteries of different models.

[0071] The testing steps for lithium batteries are as follows:

[0072] Extrusion test, this fixture is installed on a conventional lithium battery test equipment (generally a pressure test equipment or a universal testing machine), which can apply pressure through hydraulic or pneumatic pressure. When entering the extrusion test, the left and right ends of the lithium battery are fixed on the left and right workpiece tables respectively, and the telescopic cylinder drives the wedge block to make the load-bearing plate fit the lower surface of the lithium battery. After that, the lithium battery test equipment applies vertical pressure from above to squeeze the lithium battery until the pressure reaches 13kN or until the battery shows signs of damage.

[0073] The impact, puncture and other tests are the same as above. After the lithium battery is fixed, the operation can be carried out according to the national standard.

[0074] During the bending test, the load-bearing plate is adjusted to the lowest end, and a vertical downward force is applied to the lithium battery or its internal components to test the bending limit of the workpiece to be tested, whether there is leakage in the bending state, and other data. During the twisting test, the load-bearing plate is also adjusted to the lowest end, and the limit pin is rotated to remove. At this time, the limit shaft is no longer squeezed and resets to rise, the limit on the limit plate is released, the limit plate is removed, and a vertical downward force is applied to the front or rear end of the right mounting table. At this time, the left mounting table remains horizontal, and the right mounting table rotates to twist the lithium battery or components to obtain its tolerance and other data.

[0075] During the tensile and compression tests, the two ends of the test piece are fixed on the left and right workpiece tables. After the double-headed screw is rotated, the left and right workpiece tables are driven to move closer or farther from each other to perform tensile and compression tests and obtain data such as tensile strength and elongation at break.

[0076] Other testing items such as wear resistance testing can also be fixed using this fixture.

[0077] The basic principles, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A fixture for lithium battery testing equipment, characterized in that: include: base(100); A driving mechanism (200) is mounted on the base (100), the driving mechanism (200) is used to drive the left workpiece table (300) and the right workpiece table (500) to move closer to or farther from each other in a horizontal direction, and the moving direction of the left workpiece table (300) or the right workpiece table (500) is defined as a left-right direction; A left workpiece platform (300) is used to fix a lithium battery. The left workpiece platform (300) comprises a left slider (350) mounted on the driving mechanism (200). The left slider (350) is bolted to a left mounting platform (310). The left mounting platform (310) is provided with a left workpiece groove (311) for placing the lithium battery. A left displacement sensor (340) for detecting displacement of the lithium battery is installed on a side of the left workpiece groove (311) away from the right workpiece platform (500). A left pressure plate (320) for fixing the lithium battery is provided above the left mounting platform (310); A right workpiece platform (500) is used to fix the lithium battery. The right workpiece platform (500) comprises a right slider (590) mounted on the driving mechanism (200). The right slider (590) is provided with a right mounting platform (520). The right mounting platform (520) is provided with a right workpiece groove (521) for placing the lithium battery. A right displacement sensor (580) for detecting the displacement of the lithium battery is installed on a side of the right workpiece groove (521) away from the left workpiece platform (300). A right pressure plate (510) for fixing the lithium battery is provided above the right mounting platform (520); A support mechanism (400) is arranged between the left workpiece platform (300) and the right workpiece platform (500), the support mechanism (400) is used to support the bottom of the lithium battery, the support mechanism (400) comprises a load-bearing plate (410) that can be lifted up and down, and a lifting structure for driving the load-bearing plate (410) to be lifted up and down is provided at the bottom of the load-bearing plate (410); A pressure sensor (600), one end of the pressure sensor (600) being connected to the left workpiece platform (300), and the other end of the pressure sensor (600) being connected to the right workpiece platform (500); A load-bearing platform (530) is fixedly mounted on the top of the right sliding block (590). The load-bearing platform (530) is arranged on a side of the right mounting platform (520) away from the left workpiece platform (300). The right mounting platform (520) and the load-bearing platform (530) are rotatably connected via a rotating shaft (540). A limit pin (550) arranged in a horizontal direction is also arranged on the load-bearing platform (530). The right mounting platform (520) is provided with a blind hole that cooperates with the limit pin (550). A gap is provided between the right mounting platform (520) and the right sliding block (590), so that after the limiting pin (550) is separated from the blind hole, the right mounting platform (520) can rotate around the rotating shaft (540); A limiting plate (570) is provided between the right mounting platform (520) and the right sliding block (590) to fill the gap between the right mounting platform (520) and the right sliding block (590) so as to improve the stability of the right mounting platform (520).

2. The lithium battery testing equipment fixture according to claim 1, characterized in that: Bosses (110) are provided at both ends of the top of the base (100).

3. The fixture for lithium battery testing equipment according to claim 2, characterized in that: The driving mechanism (200) comprises a double-headed screw (220) arranged between two bosses (110), the two ends of the double-headed screw (220) being connected to the two bosses (110) via bearings, a driving motor (210) for driving the double-headed screw (220) to rotate being mounted on one of the bosses (110), guide rods (230) for guiding are provided on both the front and rear sides of the double-headed screw (220), the two ends of the guide rods (230) being fixedly connected to the two bosses (110) respectively; the left slider (350) and the right slider (590) are both connected to the double-headed screw (220) via threads.

4. The lithium battery testing equipment fixture according to claim 1, characterized in that: A limiting hole (522) is further provided below the blind hole, the limiting hole (522) being in communication with the blind hole, a limiting shaft (523) being slidably mounted in the limiting hole (522), a spring (524) being sleeved on the limiting shaft (523), a sealing plate (525) for limiting the limiting shaft (523) being screwed to the bottom of the limiting hole (522), and a matching hole matching the limiting shaft (523) being provided at the top of the limiting plate (570); The end of the limit pin (550) is a hemispherical structure or a conical structure, so that after the limit pin (550) is inserted into the blind hole, the limit shaft (523) is squeezed downward and snapped into the matching hole, thereby preventing the limit plate (570) from deflecting.

5. The fixture for lithium battery testing equipment according to claim 1 or 3, characterized in that: The bottom of the load-bearing plate (410) is fixedly connected to a telescopic rod (440), and the lifting structure comprises two telescopic cylinders (430) mounted horizontally on a base (100), the two telescopic cylinders (430) being symmetrically arranged along a front-to-rear direction, the output shafts of the telescopic cylinders (430) being fixedly connected to a support block (420), and a wedge block (421) for driving the load-bearing plate (410) to be lifted and lowered is provided on the top of the support block (420).

6. The fixture for lithium battery testing equipment according to claim 1, characterized in that: The left sliding block (350) is fixedly connected to a left extension block (330) on its side, the right sliding block (590) is fixedly connected to a right extension block (560) on its side, and the pressure sensor (600) is fixedly connected to the left extension block (330) and the right extension block (560) respectively.

7. The lithium battery testing equipment fixture according to claim 6, characterized in that: The right extension block (560) is provided with an adjustment hole (561), and the adjustment hole (561) is a rectangular hole.

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