Tension testing device and testing method

Abstract

The application belongs to the technical field of battery testing, and discloses a tension testing device and a testing method. The tension testing device comprises a device body, a clamping assembly and a force applying assembly. The clamping assembly comprises a vertical linear module, a tension sensor and upper and lower clamps for clamping both ends of a negative foil. The vertical linear module is used to drive the upper and lower clamps to slide towards or away from each other in the vertical direction. The tension sensor is used to detect the tension received by the upper clamp. The force applying assembly comprises a horizontal linear module, a push block and a turning roller. The horizontal linear module is used to drive the push block to slide in the horizontal direction. The push block, the upper clamp and the lower clamp are all provided with the turning roller which can rotate. The push block is horizontally movable to obtain more comprehensive parameters. The upper and lower clamps slide towards or away from each other to ensure the consistency of the force. The turning roller ensures the accuracy of the force direction, thereby improving the accuracy and reliability of the tension testing.

Description

Technical Field

[0001] This invention relates to the field of battery testing technology, and in particular to a tensile testing device and testing method. Background Technology

[0002] After prolonged use, repeated charging and discharging can cause lithium batteries to expand, leading to breakage of the negative electrode end. This can result in increased internal resistance, overheating, or even voltage failure. Therefore, to address these issues, a common practice is to perform tensile testing on the negative electrode of the battery cell to obtain the peak stress parameters of the material used to make the negative electrode when it breaks.

[0003] However, subsequent testing revealed that the breakage of the negative electrode was caused by the end of the positive electrode pressing against the negative electrode within the cell. Therefore, tensile testing also requires obtaining the displacement parameters of the positive electrode end due to expansion. This information is crucial for adjusting the battery structure design during subsequent production to prevent such phenomena from causing performance degradation or battery failure. Currently, the testing equipment can only detect the tensile force on the negative electrode and cannot obtain the displacement parameters of the positive electrode that lead to its breakage.

[0004] Therefore, there is an urgent need for a tensile testing device and method to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a tensile testing device and method that provides comprehensive data and accurate testing.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A tensile testing device is provided for testing the tensile strength of a negative electrode foil, the tensile testing device comprising:

[0008] The device body, on which a test platform is provided;

[0009] The clamping assembly includes a vertical linear module and an upper clamp and a lower clamp for clamping both ends of the negative electrode foil. The vertical linear module is connected to the test platform and is used to drive the upper clamp and the lower clamp to slide towards each other or away from each other in the vertical direction.

[0010] The force-applying assembly includes a horizontal linear module, a push block, and a steering roller. The horizontal linear module is connected to the test platform and is used to drive the push block to slide horizontally between the upper clamp and the lower clamp. A rotatable steering roller is provided between the push block and the upper clamp, and between the push block and the lower clamp. The push block and the steering roller respectively abut against both sides of the negative electrode foil along the horizontal direction. The clamping assembly also includes a tension sensor, which is used to detect the vertical tension generated by the push block sliding on the negative electrode foil clamped by the upper clamp, which is converted into the thrust force generated on the negative electrode foil when the push block slides.

[0011] Optionally, the vertical linearity module includes a drive handwheel, a drive screw, a longitudinal slide rail, an upper slide, a lower slide, and a screw nut. Two longitudinal slide rails are spaced apart on the test platform. The upper slide and the lower slide are slidably mounted on the longitudinal slide rails. The screw nut is fixedly mounted on both the upper slide and the lower slide. The drive screw has a trapezoidal external thread, and the screw nut has a trapezoidal internal thread that mates with the drive screw. The screw nut is used to connect the upper slide and the lower slide to the two ends of the drive screw. The drive handwheel is used to drive the drive screw to rotate. The end of the tension sensor facing away from the upper clamp is connected to the upper slide, and the lower clamp is connected to the lower slide.

[0012] Optionally, the drive screw is provided with an upper drive thread and a lower drive thread. The upper drive thread is threadedly connected to the screw nut fixed on the upper slide, and the lower drive thread is threadedly connected to the screw nut fixed on the lower slide. The upper drive thread and the lower drive thread have opposite directions of rotation.

[0013] Optionally, the horizontal linear module includes a drive unit, a transverse slide rail, a transverse slide table, and an encoder. The transverse slide rail passes between the upper clamp and the lower clamp and is connected to the test platform. The transverse slide table is slidably disposed on the transverse slide rail along the horizontal direction. The push block is connected to the transverse slide table. The drive unit is used to drive the transverse slide table to slide on the transverse slide rail. The encoder is used to control the displacement parameters of the drive unit driving the transverse slide table to slide.

[0014] Optionally, both the upper clamp and the lower clamp include an active clamping block, an auxiliary clamping block, a connecting rod, an elastic element, a locking element, and a cam handle. The connecting rod passes through the active clamping block and the auxiliary clamping block. The cam handle is hinged to one end of the connecting rod extending from the active clamping block and abuts against the active clamping block. The locking element is threaded to one end of the connecting rod extending from the auxiliary clamping block and abuts against the auxiliary clamping block. The elastic element is provided between the cam handle and the active clamping block, and between the locking element and the auxiliary clamping block.

[0015] Optionally, the active clamping block has a positioning protrusion on the side facing the auxiliary clamping block, and the auxiliary clamping block has a positioning groove on the side facing the active clamping block, with the positioning protrusion inserted into the positioning groove.

[0016] Optionally, the clamping assembly further includes an anti-slip elastic element, and the portions of the active clamping block and the auxiliary clamping block that abut against the negative electrode foil are provided with the anti-slip elastic element.

[0017] Optionally, the surface of the pusher that abuts against the negative electrode foil is an arc-shaped surface.

[0018] Optionally, the arc-shaped surface of the push block is further provided with an arc-shaped abutment protrusion.

[0019] On the other hand, a testing method is provided, which involves performing a tensile test on the negative electrode foil using a tensile testing device as described in any of the preceding claims, comprising the following steps:

[0020] S1. The two ends of the negative electrode foil are respectively clamped in the upper clamp and the lower clamp, the push block and the steering roller are located on both sides of the negative electrode foil, so that the negative electrode foil is located in the central area of ​​the steering roller;

[0021] S2. Drive the vertical linear module to make the upper clamp and the lower clamp slide in opposite directions, so that the negative electrode foil is taut, the force is uniform, and there is no twisting or deformation.

[0022] S3. Drive the vertical linearity module to make the upper clamp and the lower clamp slide towards each other, so that the force parameter of the tension sensor returns to zero;

[0023] S4. Activate the horizontal linear module, drive the pusher block to approach the negative electrode foil, and apply a pushing force to the negative electrode foil until the negative electrode foil breaks;

[0024] S5. Record the displacement of the push block and the force parameters of the tension sensor;

[0025] S6. Reset the horizontal linear module and remove the broken negative electrode foil;

[0026] S7. Clean the upper clamp and the lower clamp.

[0027] The beneficial effects of this invention are:

[0028] This invention provides a tensile testing device for testing negative electrode foil. By setting up a vertical linear module that allows the upper and lower clamps to slide towards or away from each other, the distance between the push block and the upper and lower clamps remains consistent. This ensures that the upper and lower parts of the negative electrode foil experience consistent force during the pushing process. Furthermore, a steering roller ensures that the force direction of the upper and lower clamps remains vertical, resulting in accurate force direction and improved testing accuracy. A tensile sensor detects the vertical tensile force generated by the pushing force exerted on the negative electrode foil by the sliding push block when it is clamped by the upper clamp. A horizontal linear module drives the push block to move horizontally, simulating the force exerted by the positive electrode foil on the negative electrode foil. This allows for the acquisition of displacement parameters of the positive electrode foil when the negative electrode foil breaks, providing more comprehensive data and improving the performance of the modified battery.

[0029] The present invention also provides a testing method that uses the above-mentioned tensile testing device to perform tensile testing on the negative electrode foil, thereby obtaining more comprehensive data, more accurate test results, and improving the reliability of the testing method. Attached Figure Description

[0030] Figure 1 This is an assembly drawing of the tensile testing device of the present invention;

[0031] Figure 2 This is a front view of the structure of the testing platform of the tensile testing device of the present invention;

[0032] Figure 3 This is a three-dimensional view of the testing platform of the tensile testing device of the present invention from a first-person perspective;

[0033] Figure 4 This is a three-dimensional view of the testing platform of the tensile testing device of the present invention from a second perspective;

[0034] Figure 5 This is a schematic diagram of the upper clamp in the tensile testing device of the present invention;

[0035] Figure 6 This is a schematic diagram of the push block in the tensile testing device of the present invention;

[0036] Figure 7 This is a flowchart of the testing method of the present invention.

[0037] In the picture:

[0038] 100. Negative electrode foil;

[0039] 1. Device body; 11. Frame; 111. Test platform; 112. Control platform; 12. Display panel; 13. Start button; 14. Emergency stop button; 15. Buzzer; 16. Adjustable feet;

[0040] 2. Clamping assembly; 21. Vertical linearity module; 211. Drive handwheel; 212. Drive screw; 213. Longitudinal slide rail; 214. Upper slide table; 215. Lower slide table; 216. Transmission frame; 22. Tension sensor; 23. Upper clamp; 231. Active clamping block; 232. Auxiliary clamping block; 233. Connecting rod; 234. Elastic element; 235. Locking element; 236. Cam handle; 24. Lower clamp; 25. Anti-slip elastic element;

[0041] 3. Force application component; 31. Horizontal linear module; 311. Drive component; 312. Transverse slide rail; 313. Transverse slide table; 314. Encoder; 315. Pad block; 316. Mounting panel; 32. Push block; 321. Arc surface; 322. Abutment protrusion; 33. Steering roller; 34. Groove photoelectric sensor. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0043] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0046] In order to obtain more comprehensive test data and improve the accuracy of the acquired data, this embodiment provides a tensile testing device for performing tensile tests on the negative electrode foil 100.

[0047] like Figures 1 to 6 As shown, the tensile testing device includes a device body 1, a clamping assembly 2, and a force application assembly 3. The device body 1 is equipped with a testing platform 111. The clamping assembly 2 includes a vertical linear module 21 and an upper clamp 23 and a lower clamp 24 for clamping both ends of the negative electrode foil 100. The vertical linear module 21 is connected to the testing platform 111 and is used to drive the upper clamp 23 and lower clamp 24 to slide towards or away from each other in the vertical direction. The force application assembly 3 includes a horizontal linear module 31, a push block 32, and a steering roller 33. The horizontal linear module 31 is connected to... On the test platform 111, a push block 32 is used to drive the push block 32 to slide horizontally between the upper clamp 23 and the lower clamp 24. Rotatable steering rollers 33 are provided between the push block 32 and the upper clamp 23 and between the push block 32 and the lower clamp 24. The push block 32 and the steering rollers 33 respectively abut against the negative electrode foil 100 on both sides in the horizontal direction. The clamping assembly 2 also includes a tension sensor 22, which is used to detect the vertical tension generated by the push block 32 on the negative electrode foil 100 clamped by the upper clamp 23.

[0048] By setting a vertical linear module 21 that allows the upper clamp 23 and lower clamp 24 to slide towards or away from each other, the distance between the push block 32 and the upper clamp 23 and lower clamp 24 remains consistent. This ensures that the upper and lower parts of the negative electrode foil 100 experience consistent force during the pushing process applied by the push block 32. Furthermore, the steering roller 33 keeps the force direction of the upper clamp 23 and lower clamp 24 vertical, ensuring accurate force direction and improving test accuracy. The tension sensor 22 detects the vertical tension generated by the pushing force on the negative electrode foil 100 clamped by the upper clamp 23 when the push block 32 slides. The horizontal linear module 31 drives the push block 32 to move horizontally, simulating the force applied by the positive electrode foil to the negative electrode foil 100. This allows for the acquisition of displacement parameters of the positive electrode foil when the negative electrode foil 100 breaks, resulting in more comprehensive data and improved battery performance after adjustment and modification.

[0049] In this embodiment, the device body 1 includes a frame 11, a display panel 12, a start button 13, an emergency stop button 14, a buzzer 15, an electrical box, and adjustable feet 16. The frame 11 is equipped with a test platform 111 and a control platform 112. The clamping assembly 2 and the force application assembly 3 are both connected to the test platform 111. The display panel 12, start button 13, emergency stop button 14, and buzzer 15 are all located on the control platform 112. The start button 13 controls the activation of the entire device. The display panel 12 displays the displacement of the push block 32 and the tension reading of the tension sensor 22, transmitted via data, for observation and recording by testing personnel. Data transmission can be wired or wireless. The buzzer 15 serves as a warning; in case of an unexpected situation during testing, the buzzer 15 will sound to alert the testing personnel, allowing them to promptly press the emergency stop button 14 to stop the device and prevent serious accidents. To prevent accidents and improve safety during testing, the electrical box is located inside the frame 11 and supplies power to the electrical components of the tensile testing device. In addition, the adjustable feet 16 include an adjusting screw and feet. The adjusting screw is threaded to both the feet and the bottom of the frame 11 for height adjustment. When the ground is uneven, the distance between the feet and the frame 11 is adjusted by screwing on the feet, thus adapting to uneven ground and increasing the environmental adaptability of the tensile testing device. Furthermore, to ensure the frame 11 is placed more stably on the ground, the feet have a conical structure, with the smaller diameter end connected to the adjusting screw and the larger diameter end abutting against the ground, increasing the contact area between the feet and the ground and maintaining the stability of the frame 11 when placed on the ground. In this embodiment, adjustable feet 16 are provided at all four corners of the frame 11.

[0050] Optionally, such as Figures 2 to 4As shown, the vertical linearity module 21 includes a drive handwheel 211, a drive screw 212, a longitudinal slide rail 213, an upper slide 214, a lower slide 215, and a screw nut. Two longitudinal slide rails 213 are spaced apart on the test platform 111. The upper slide 214 and the lower slide 215 are slidably mounted on the longitudinal slide rails 213. Screw nuts are fixed on both the upper slide 214 and the lower slide 215. The drive screw 212 has a trapezoidal external thread, and the screw nut has a trapezoidal internal thread that mates with the drive screw 212. The screw nut is used to connect the upper slide 214 and the lower slide 215 to the two ends of the drive screw 212. The drive handwheel 211 is used to drive the drive screw 212 to rotate. The end of the tension sensor 22 facing away from the upper clamp 23 is connected to the upper slide 214, and the lower clamp 24 is connected to the lower slide 215. By setting two longitudinal slide rails 213 at intervals, the upper slide 214 and lower slide 215 slide more smoothly and stably. The upper slide 214 and lower slide 215 are driven to slide vertically by the drive screw 212, which has high transmission efficiency and transmission accuracy. Moreover, the external thread of the drive screw 212 is set as a trapezoidal external thread and the internal thread of the screw nut is set as a trapezoidal internal thread, which has a self-locking function. When the drive screw 212 is not rotating, the upper slide 214 and lower slide 215 can be fixed on the drive screw 212, thereby preventing the negative electrode foil 100 from pulling the upper slide 214 and lower slide 215 to displacement when the push block 32 slides and applies a pushing force to the negative electrode foil 100.

[0051] In this embodiment, the vertical linearity module 21 further includes a transmission frame 216, which is connected to the test platform 111. The transmission frame 216 includes a front end plate, a rear end plate, and two side plates. One end of the drive screw 212 passes through the front end plate and is connected to the drive handwheel 211, while the other end of the drive screw 212 is rotatably mounted on the rear end plate. Two longitudinal slide rails 213 are correspondingly connected to the two side plates. In this embodiment, to facilitate the assembly and disassembly of the tension sensor 22, both ends of the tension sensor 22 are connected to the upper slide table 214 and the upper clamp 23 by bolts.

[0052] Furthermore, such as Figures 2 to 4As shown, the drive screw 212 has an upper drive thread and a lower drive thread. The upper drive thread is threadedly connected to the screw nut fixed on the upper slide 214, and the lower drive thread is threadedly connected to the screw nut fixed on the lower slide 215. The upper and lower drive threads rotate in opposite directions. By setting the upper and lower drive threads with opposite directions on the drive screw 212, the upper slide 214 and lower slide 215, which are connected to both ends of the drive screw 212 via the screw nut, only require one screw and one power source. The upper slide 214 and lower slide 215 can slide towards each other or away from each other by rotating the drive screw 212. This reduces the number of power sources and parts, lowers manufacturing costs, and improves the overall reliability of the mechanism due to its simplified structure. It is also easier to maintain and repair. In this embodiment, the lengths of the upper drive thread and the lower drive thread can be set according to the sliding stroke of the upper slide 214 and the lower slide 215, so as to select the optimal lengths of the upper drive thread and the lower drive thread while satisfying the sliding stroke of the upper slide 214 and the lower slide 215, thereby reducing the processing cost.

[0053] Optionally, such as Figures 1 to 4 As shown, the horizontal linear module 31 includes a drive component 311, a transverse slide rail 312, a transverse slide table 313, and an encoder 314. The transverse slide rail 312 passes between the upper clamp 23 and the lower clamp 24 and is connected to the test platform 111. The transverse slide table 313 is slidably mounted on the transverse slide rail 312 in the horizontal direction. A push block 32 is connected to the transverse slide table 313. The drive component 311 drives the transverse slide table 313 to slide on the transverse slide rail 312. The encoder 314 controls the displacement parameters of the drive component 311 driving the transverse slide table 313 to slide. By setting the transverse slide rail 312 and the transverse slide table 313, the push block 32 slides more smoothly in the horizontal direction. Furthermore, by setting the encoder 314 to control the displacement parameters of the drive component 311 driving the transverse slide table 313 to slide, it is easier to better control the sliding speed and sliding distance of the transverse slide table 313 during the test experiment.

[0054] In this embodiment, the horizontal linear module 31 further includes a pad 315 and a mounting panel 316. The pad 315 is connected to the test platform 111, and the mounting panel 316 is connected to the pad 315. Both the horizontal linear module 31 and the steering roller 33 are connected to the mounting panel 316. To improve the accuracy of the test, in this embodiment, the encoder 314 causes the pusher 32 to approach the negative electrode foil 100 at a uniform speed of 0.4 mm / s-1 mm / s. For safety during testing, the horizontal linear module 31 also includes a slotted photoelectric sensor 34 and a matching baffle. The slotted photoelectric sensor 34 is fixed to the end of the transverse slide rail 312 away from the drive component 311. The baffle is fixedly connected to the transverse slide table 313 and moves with it. When the transverse slide table 313 slides to its limit position, the baffle is positioned between the slotted photoelectric sensors 34, blocking the laser light inside the sensors and thus controlling the drive component 311 to stop driving, preventing the transverse slide table 313 from sliding beyond its limit. In this embodiment, the drive component 311 is a servo motor, and the encoder 314 controls the servo motor to adjust the sliding distance and sliding speed of the transverse slide table 313.

[0055] Optionally, such as Figure 4 , Figure 5 As shown, both the upper clamp 23 and the lower clamp 24 include an active clamping block 231, an auxiliary clamping block 232, a connecting rod 233, an elastic element 234, a locking element 235, and a cam handle 236. The connecting rod 233 passes through the active clamping block 231 and the auxiliary clamping block 232. The cam handle 236 is hinged to the end of the connecting rod 233 that extends out of the active clamping block 231 and abuts against the active clamping block 231. The locking element 235 is threaded to the end of the connecting rod 233 that extends out of the auxiliary clamping block 232 and abuts against the auxiliary clamping block 232. Elastic elements 234 are provided between the cam handle 236 and the active clamping block 231, and between the locking element 235 and the auxiliary clamping block 232. By using the cam handle 236, only rotating the cam handle 236 is needed to make different areas of the cam handle 236 abut against the active clamping block 231, thereby pushing the active clamping block 231. Furthermore, the elastic element 234 is used to strengthen the clamping force. For example, the elastic element 234 is a spring.

[0056] Optionally, such as Figure 5 As shown, the active clamping block 231 has a positioning protrusion on the side facing the auxiliary clamping block 232, and the auxiliary clamping block 232 has a positioning groove on the side facing the active clamping block 231. The positioning protrusion is inserted into the positioning groove. By setting the positioning protrusion and the positioning groove, the active clamping block 231 and the auxiliary clamping block 232 can be more accurately docked. Furthermore, the cooperation between the positioning groove and the positioning protrusion can also play a limiting role, preventing the active clamping block 231 and the auxiliary clamping block 232 from shifting in the vertical direction.

[0057] Furthermore, such as Figure 3 As shown, the clamping assembly 2 also includes an anti-slip elastic element 25. The portions of the active clamping block 231 and the auxiliary clamping block 232 that abut against the negative electrode foil 100 are both provided with the anti-slip elastic element 25. By providing the anti-slip elastic element 25, the frictional force when clamping the negative electrode foil 100 is increased, preventing the negative electrode foil 100 from coming off. Furthermore, due to its elasticity, it also prevents damage to the negative electrode foil 100 during clamping, thus preventing the negative electrode foil 100 from breaking at the point of damage and affecting the test results. In this embodiment, the anti-slip elastic element 25 is made of polyurethane material.

[0058] Optionally, such as Figure 2 , Figure 6 As shown, the surface of the pusher block 32 that abuts against the negative electrode foil 100 is an arc-shaped surface 321. By making the surface of the pusher block 32 that abuts against the negative electrode foil 100 an arc-shaped surface 321, the stress situation of the negative electrode foil 100 at the bending point is simulated. This increases the realism of the simulation and improves the accuracy of the test.

[0059] Furthermore, such as Figure 6 As shown, the arc-shaped surface 321 of the pusher block 32 is also provided with an arc-shaped abutment protrusion 322. By setting the arc-shaped abutment protrusion 322, the shape of the positive electrode is simulated, thereby increasing the realism of the simulation and improving the accuracy of the test. In this embodiment, the height of the abutment protrusion 322 is 150 micrometers.

[0060] like Figure 7 As shown, in this embodiment, a testing method is also provided. The testing method uses the above-mentioned tensile testing device to perform a tensile test on the negative electrode foil 100, and includes the following steps:

[0061] S1. The two ends of the negative electrode foil 100 are respectively clamped in the upper clamp 23 and the lower clamp 24. The push block 32 and the steering roller 33 are located on both sides of the negative electrode foil 100, so that the negative electrode foil 100 is in the central area of ​​the steering roller 33.

[0062] S2. Drive the vertical linear module 21 to make the upper clamp 23 and the lower clamp 24 slide in opposite directions, so that the negative electrode foil 100 is taut, the force is uniform, and there is no twisting or deformation.

[0063] S3. Drive the vertical linearity module 21 to make the upper clamp 23 and the lower clamp 24 slide towards each other, so that the force parameter of the tension sensor 22 returns to zero.

[0064] S4. Start the horizontal linear module 31, drive the pusher block 32 to approach the negative electrode foil 100, and apply a pushing force to the negative electrode foil 100 until the negative electrode foil 100 breaks.

[0065] S5. Record the displacement of the push block 32 and the force parameters of the tension sensor 22;

[0066] S6. Reset the horizontal linear module 31 and remove the broken negative electrode foil 100.

[0067] S7. Clean the upper clamp 23 and the lower clamp 24.

[0068] By applying the tensile testing device described above to perform tensile testing on the negative electrode foil 100, the obtained data is more comprehensive, the test results are more accurate, and the reliability of the test method is improved.

[0069] In this embodiment, a PLC controller is also provided to facilitate data recording and storage. The PLC records relevant parameters during the test process and calculates the peak tensile force experienced by the negative electrode foil 100 when it breaks and the displacement of the horizontal linear module 31 from the time the negative electrode foil 100 is subjected to force to the time of breakage. The data is then displayed on the display panel 12 so that the testing personnel can intuitively obtain the experimental data.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A tensile testing device, wherein the tensile testing device is used to perform tensile testing on a negative electrode foil (100), characterized in that, The tensile testing device includes: The device body (1) is provided with a test platform (111); The clamping assembly (2) includes a vertical linearity module (21) and an upper clamp (23) and a lower clamp (24) for clamping the two ends of the negative electrode foil (100). The vertical linearity module (21) is connected to the test platform (111) and is used to drive the upper clamp (23) and the lower clamp (24) to slide towards each other or away from each other in the vertical direction. The force application component (3) includes a horizontal linear module (31), a push block (32), and a steering roller (33). The horizontal linear module (31) is connected to the test platform (111) and is used to drive the push block (32) to slide horizontally between the upper clamp (23) and the lower clamp (24). A [missing information] is provided between the push block (32) and the upper clamp (23), and between the push block (32) and the lower clamp (24). The rotatable steering roller (33), the push block (32) and the steering roller (33) respectively abut against the negative electrode foil (100) on both sides along the horizontal direction. The clamping assembly (2) also includes a tension sensor (22), which is used to detect the vertical tension generated by the push block (32) on the negative electrode foil (100) clamped by the upper clamp (23) when it slides.

2. The tensile testing device according to claim 1, characterized in that, The vertical linearity module (21) includes a drive handwheel (211), a drive screw (212), a longitudinal slide rail (213), an upper slide (214), a lower slide (215), and a screw nut. Two longitudinal slide rails (213) are spaced apart on the test platform (111). The upper slide (214) and the lower slide (215) are slidably mounted on the longitudinal slide rails (213). The screw nut is fixedly mounted on both the upper slide (214) and the lower slide (215). The drive screw (212)... 2) The screw nut is provided with a trapezoidal external thread and a trapezoidal internal thread that cooperates with the drive screw (212). The screw nut is used to connect the upper slide (214) and the lower slide (215) to the two ends of the drive screw (212). The drive handwheel (211) is used to drive the drive screw (212) to rotate. The end of the tension sensor (22) away from the upper clamp (23) is connected to the upper slide (214). The lower clamp (24) is connected to the lower slide (215).

3. The tensile testing device according to claim 2, characterized in that, The drive screw (212) is provided with an upper drive thread and a lower drive thread. The upper drive thread is threadedly connected to the screw nut fixed on the upper slide (214), and the lower drive thread is threadedly connected to the screw nut fixed on the lower slide (215). The upper drive thread and the lower drive thread have opposite directions of rotation.

4. The tensile testing device according to claim 1, characterized in that, The horizontal linear module (31) includes a drive unit (311), a transverse slide rail (312), a transverse slide table (313), and an encoder (314). The transverse slide rail (312) passes between the upper clamp (23) and the lower clamp (24) and is connected to the test platform (111). The transverse slide table (313) is slidably disposed on the transverse slide rail (312) along the horizontal direction. The push block (32) is connected to the transverse slide table (313). The drive unit (311) is used to drive the transverse slide table (313) to slide on the transverse slide rail (312). The encoder (314) is used to control the displacement parameters of the drive unit (311) driving the transverse slide table (313) to slide.

5. The tensile testing device according to claim 1, characterized in that, Both the upper clamp (23) and the lower clamp (24) include an active clamping block (231), an auxiliary clamping block (232), a connecting rod (233), an elastic element (234), a locking element (235), and a cam handle (236). The connecting rod (233) passes through the active clamping block (231) and the auxiliary clamping block (232). The cam handle (236) is hinged to the end of the connecting rod (233) that extends out of the active clamping block (231) and abuts against the active clamping block (231). The locking element (235) is threaded to the end of the connecting rod (233) that extends out of the auxiliary clamping block (232) and abuts against the auxiliary clamping block (232). The elastic element (234) is provided between the cam handle (236) and the active clamping block (231) and between the locking element (235) and the auxiliary clamping block (232).

6. The tensile testing device according to claim 5, characterized in that, The active clamping block (231) has a positioning protrusion on the side facing the auxiliary clamping block (232), and the auxiliary clamping block (232) has a positioning groove on the side facing the active clamping block (231), with the positioning protrusion inserted into the positioning groove.

7. The tensile testing device according to claim 5, characterized in that, The clamping assembly (2) further includes an anti-slip elastic element (25), and the active clamping block (231) and the auxiliary clamping block (232) are provided with the anti-slip elastic element (25) at the portions that abut against the negative electrode foil (100).

8. The tensile testing apparatus according to any one of claims 1-7, characterized in that, The surface of the pusher (32) that abuts against the negative electrode foil (100) is an arc-shaped surface (321).

9. The tensile testing device according to claim 8, characterized in that, The push block (32) also has an arc-shaped abutment protrusion (322) on its arc-shaped surface (321).

10. A test method, characterized in that, The testing method involves performing a tensile test on the negative electrode foil (100) using the tensile testing device as described in any one of claims 1-9, and includes the following steps: S1. The two ends of the negative electrode foil (100) are respectively clamped in the upper clamp (23) and the lower clamp (24), the push block (32) and the steering roller (33) are located on both sides of the negative electrode foil (100), so that the negative electrode foil (100) is in the central area of ​​the steering roller (33); S2. Drive the vertical linear module (21) to make the upper clamp (23) and the lower clamp (24) slide in opposite directions, so that the negative electrode foil (100) is taut, the force is uniform, and there is no twisting or deformation. S3. Drive the vertical linear module (21) to make the upper clamp (23) and the lower clamp (24) slide towards each other, so that the force parameter of the tension sensor (22) returns to zero; S4. Start the horizontal linear module (31), drive the pusher (32) to move closer to the negative electrode foil (100), and apply a pushing force to the negative electrode foil (100) until the negative electrode foil (100) breaks; S5. Record the displacement of the push block (32) and the force parameters of the tension sensor (22); S6. Reset the horizontal linear module (31) and remove the broken negative electrode foil (100); S7. Clean the upper clamp (23) and the lower clamp (24).

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