A tensile testing machine for hot-pressed core compaction testing

Abstract

This application relates to a tensile testing machine for hot-pressed core compaction testing, belonging to the field of lithium battery production technology. To solve the problem of inaccurate testing of bonding effects, it includes a base with a frame mounted on it. A hydraulic cylinder is vertically arranged on the frame, and an L-shaped seat is mounted on the output end of the hydraulic cylinder. The L-shaped seat is slidably connected to the frame. An upper pneumatic gripper for gripping electrode sheets is located at the bottom of the L-shaped seat, and a lower pneumatic gripper for gripping the separator is located on the base. The upper pneumatic gripper is positioned directly above the lower pneumatic gripper, with their gripping ends facing each other. This application significantly improves testing accuracy, effectively avoids interference from human factors and ambient light, achieves consistent evaluation of the compaction effect at various points during hot pressing, and greatly improves the objectivity and reliability of the test results.

Description

Technical Field

[0001] This application relates to the field of lithium battery production technology, and in particular to a tensile testing machine for hot-pressed core compaction testing. Background Technology

[0002] In the lithium battery production process, regardless of whether it is a winding or stacking process, the battery cell is generally hot-pressed for shaping. On the one hand, this improves the flatness of the lithium-ion battery, ensuring that the cell thickness meets the requirements and has high consistency; on the other hand, it allows the adhesive on the separator surface and the electrode sheets to adhere tightly together, shortening the lithium-ion diffusion distance and reducing the battery's internal resistance. For the hot-pressed core, the conventional method for confirming the compaction effect mainly includes the following steps: First, a Hipot short-circuit test is performed to detect whether there are any safety hazards such as insulation failure in the cell; second, the thickness and width of the cell are confirmed to meet the design specifications to ensure the dimensional accuracy of the cell; finally, the bonding effect of the inner and outer separators and electrode sheets is visually confirmed after the cell is disassembled.

[0003] In related technologies, conventional methods for detecting adhesion, namely visual confirmation of adhesion, can roughly determine whether the diaphragm and electrode are bonded together, but cannot accurately assess the consistency of each point of hot pressing. In addition, visual confirmation is affected by human factors, ambient light and other factors, which have great subjectivity and uncertainty, resulting in inaccurate test results, so it needs to be improved. Utility Model Content

[0004] To address the problem of inaccurate testing of bonding effects, this application provides a tensile testing machine for hot-pressed core compaction.

[0005] The tensile testing machine for hot-pressed core compaction testing provided in this application adopts the following technical solution:

[0006] A tensile testing machine for hot-pressed core compaction includes a base, a frame mounted on the base, a hydraulic cylinder vertically arranged on the frame, an L-shaped seat at the output end of the hydraulic cylinder, the L-shaped seat being slidably connected to the frame, an upper pneumatic gripper for gripping electrode sheets at the bottom of the L-shaped seat, and a lower pneumatic gripper for gripping diaphragms mounted on the base, the upper pneumatic gripper being positioned directly above the lower pneumatic gripper, with the gripping ends of the upper and lower pneumatic grippers arranged opposite each other.

[0007] Conventional methods for detecting adhesion, i.e., visual confirmation, can roughly determine whether the diaphragm and electrode are bonded together, but cannot accurately assess the consistency of each point during hot pressing. In addition, visual confirmation is affected by human factors, ambient light, and other factors, resulting in significant subjectivity and uncertainty, leading to inaccurate test results. By adopting the above-mentioned technical solution, including a base, a frame mounted on the base, a hydraulic cylinder arranged on the frame, an L-shaped seat slidably mounted on the frame and connected by the hydraulic cylinder, and an upper pneumatic gripper mounted on the bottom of the L-shaped seat, and a lower pneumatic gripper mounted on the base;

[0008] When testing the compaction effect of the core after hot pressing, after Hipot short-circuit testing and confirming that the thickness and width meet the design specifications, sample preparation is carried out. Starting from the outer ring of the core, samples of the separator / positive electrode bonding sheet are cut every N folds to ensure that the sample size meets the MD and TD requirements. The sample number and test point are marked. The upper pneumatic gripper is used to grip the electrode sheet and the lower pneumatic gripper is used to grip the separator. The hydraulic cylinder is started to perform a peel test at a set speed (e.g., 50mm / min). The peel force value is recorded. If the peel strength is lower than the set standard, it is judged as NG; if it is higher than the standard, it is judged as OK, thus realizing the compaction test.

[0009] By incorporating hydraulic cylinders, L-shaped seats, upper pneumatic grippers, and lower pneumatic grippers, this equipment significantly improves inspection accuracy through a mechanically automated process compared to traditional visual inspection methods. The solution effectively avoids interference from human factors and ambient light through precise hydraulic cylinder drive, stable L-shaped seat guidance, and reliable pneumatic gripper clamping, achieving consistent evaluation of the compaction effect at each hot-pressing point and greatly enhancing the objectivity and reliability of the inspection results.

[0010] Optionally, both the upper and lower pneumatic grippers are provided with corrugated grooves for anti-slip purposes, and the two corrugated grooves are respectively opened at the gripping ends of the upper and lower pneumatic grippers.

[0011] By adopting the above technical solution, corrugated grooves are formed at the clamping ends of the upper and lower pneumatic grippers. The setting of corrugated grooves significantly improves the clamping stability of the electrode and the diaphragm. The corrugated grooves adopt a toothed cross structure, which increases the friction coefficient and makes the clamping force distribution more uniform, effectively preventing the electrode from slipping or the diaphragm from wrinkling, and ensuring the accuracy of the peeling force value acquisition.

[0012] Optionally, the L-shaped base is provided with a tester for detecting the bonding strength between the electrode and the diaphragm, and the tester is vertically arranged on the L-shaped base.

[0013] By adopting the above technical solution, the tester is installed on an L-shaped base; through the settings of the tester, the tester is coaxially linked with the hydraulic cylinder drive shaft, and the peeling force value is directly transmitted to the control system through the sensor, eliminating the mechanical transmission error of the traditional external force measuring device, resulting in high detection accuracy and reliable data.

[0014] Optionally, the tester is provided with an assembly strip, and the L-shaped seat is provided with an assembly groove for fitting the assembly strip.

[0015] By adopting the above technical solution, the assembly strip is fixedly installed on the tester, and the tester is fixed to the assembly slot of the L-shaped seat through the assembly strip; by setting the assembly strip and the assembly slot, the equipment assembly efficiency is improved, and the cooperation between the assembly strip and the assembly slot ensures the installation stability of the tester and ensures that it will not loosen during long-term operation.

[0016] Optionally, the frame is provided with a fixed guide rail, which is arranged along the height direction of the frame, and the L-shaped seat is provided with a sliding block, which is slidably connected to the fixed guide rail.

[0017] By adopting the above technical solution, the fixed guide rail is fixed on the frame, and the L-shaped seat slides on the fixed guide rail of the frame through the sliding block. The setting of the fixed guide rail and the sliding block ensures the stable movement of the L-shaped seat in the vertical direction, prevents deviation, improves the repeatability of positioning accuracy and reduces force fluctuation, enhances the accuracy of testing, and provides a stable and reliable guarantee for the peeling test of lithium battery hot pressing process.

[0018] Optionally, the end of the fixed guide rail is provided with a collision protection plate for controlling the stroke, and the collision protection plate is connected to the frame.

[0019] By adopting the above technical solution, the anti-collision plate is installed on the frame. The anti-collision plate helps to improve both the safety of equipment operation and the accuracy of motion. The anti-collision plate forms a physical travel limit barrier, which effectively prevents the L-shaped seat from overtravel collision due to loss of control or misoperation, avoids equipment damage and test interruption, significantly improves the reliability and stability of lithium battery hot pressing process stripping test, and provides safety redundancy for continuous equipment operation.

[0020] Optionally, the base is provided with a guide rail, and the bottom of the frame is provided with a mating groove, wherein the guide rail is adapted to the inner wall of the mating groove.

[0021] By adopting the above technical solution, the base and the frame are fitted together through guide rails and mating grooves; the setting of guide rails and mating grooves ensures a stable fit between the frame and the base, and the base and the frame are precisely fitted together through guide rails and mating grooves, effectively avoiding equipment vibration caused by assembly errors.

[0022] Optionally, a number of fastening bolts for fixing are provided between the frame and the base.

[0023] By adopting the above technical solution, the frame and the base are fixed together by fastening bolts. The fastening bolts ensure a stable connection between the frame and the base, providing a reliable and high-precision operating basis for the peeling test of lithium battery hot pressing process.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By using hydraulic cylinders, L-shaped seats, upper pneumatic grippers, and lower pneumatic grippers, this equipment significantly improves the inspection accuracy through a mechanically automated process compared to traditional visual inspection methods. This solution effectively avoids interference from human factors and ambient light by using precise hydraulic cylinder drive, stable L-shaped seat guidance, and reliable pneumatic grippers. It achieves consistent evaluation of the compaction effect at each point of hot pressing, greatly improving the objectivity and reliability of the inspection results.

[0026] 2. The setting of corrugated grooves significantly improves the clamping stability of the electrode and the diaphragm. The corrugated grooves adopt a toothed cross structure, which increases the friction coefficient and makes the clamping force distribution more uniform. This can effectively prevent the electrode from slipping or the diaphragm from wrinkling, and ensure the accuracy of the peeling force value acquisition.

[0027] 3. Through the settings of the tester, the tester is coaxially linked with the hydraulic cylinder drive shaft, and the peeling force value is directly transmitted to the control system through the sensor, eliminating the mechanical transmission error of traditional external force measuring devices, resulting in high detection accuracy and reliable data. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of a tensile testing machine for hot-pressed core compaction testing in an embodiment of this application.

[0029] Figure 2 This is a structural schematic diagram illustrating the installation relationship between the hydraulic cylinder and the L-shaped seat in the embodiments of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Base; 2. Frame; 3. Hydraulic cylinder; 4. L-shaped seat; 5. Upper pneumatic gripper; 6. Lower pneumatic gripper; 7. Corrugated groove; 8. Tester; 9. Assembly strip; 10. Assembly slot; 11. Fixed guide rail; 12. Sliding block; 13. Anti-collision plate; 14. Guide slide rail; 15. Mating groove; 16. Fastening bolt. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0032] This application discloses a tensile testing machine for hot-pressed core compaction testing. (Refer to...) Figure 1 The hot-pressed core compaction test tensile testing machine includes a base 1. In this embodiment, the base 1 is flat, and a frame 2 is vertically mounted on the base 1. A guide rail 14 is fixed on the base 1. A mating groove 15 is opened at the bottom of the frame 2. The guide rail 14 is adapted to the inner wall of the mating groove 15. The guide rail 14 and the mating groove 15 work together to ensure the stable fit between the frame 2 and the base 1. The base 1 and the frame 2 achieve precise fit through the guide rail 14 and the mating groove 15, effectively avoiding equipment vibration caused by assembly errors.

[0033] Reference Figure 1 Meanwhile, several fastening bolts 16 are installed between the frame 2 and the base 1. The fastening bolts 16 are arranged in sequence at intervals. Preferably, there are four fastening bolts 16. The fastening bolts 16 ensure a stable connection between the frame 2 and the base 1 and are fixed reliably, providing a high-precision and high-reliability operating basis for the peeling test of the lithium battery hot pressing process.

[0034] Reference Figure 1 and Figure 2 The hydraulic cylinder 3 is vertically mounted on the frame 2. An L-shaped seat 4 is hinged to the output end of the hydraulic cylinder 3. The L-shaped seat 4 is slidably mounted on the frame 2. A fixed guide rail 11 is mounted and fixed on the frame 2. The fixed guide rail 11 is arranged along the height direction of the frame 2. A sliding block 12 is mounted on the side of the L-shaped seat 4 near the frame 2. The sliding block 12 is slidably connected to the fixed guide rail 11. This ensures the stable movement of the L-shaped seat 4 in the vertical direction, prevents deviation, improves the repeatability of positioning accuracy and reduces force fluctuation, and enhances the accuracy of the test. It provides a stable and reliable guarantee for the peeling test of the lithium battery hot pressing process.

[0035] Reference Figure 1 Meanwhile, a collision protection plate 13 is installed on the frame 2. The collision protection plate 13 is installed at the end of the fixed guide rail 11. In this embodiment, the collision protection plate 13 is located at the end of the fixed guide rail 11 facing the base 1. The collision protection plate 13 helps to achieve a dual improvement in equipment operation safety and motion accuracy. The collision protection plate 13 forms a physical travel limit barrier, effectively preventing the L-shaped seat 4 from overtravel collision due to loss of control or misoperation, avoiding equipment damage and test interruption, significantly improving the reliability and stability of lithium battery hot pressing process stripping test, and providing safety redundancy for continuous equipment operation.

[0036] Reference Figure 1 The bottom of the L-shaped base 4 is equipped with an upper pneumatic gripper 5, and the base 1 is equipped with a lower pneumatic gripper 6. The upper pneumatic gripper 5 is arranged directly above the lower pneumatic gripper 6, and the gripping ends of the upper pneumatic gripper 5 and the lower pneumatic gripper 6 are arranged opposite each other. At the same time, the upper pneumatic gripper 5 is used to grip the electrode sheet, and the lower pneumatic gripper 6 is used to grip the diaphragm. In this embodiment, the samples gripped by the upper pneumatic gripper 5 and the lower pneumatic gripper 6 can be interchanged.

[0037] Reference Figure 1 Both the upper pneumatic gripper 5 and the lower pneumatic gripper 6 have corrugated grooves 7 at their gripping ends, which significantly improves the gripping stability of the electrode and the diaphragm. The corrugated grooves 7 adopt a toothed cross structure, which increases the friction coefficient to make the gripping force distribution more uniform, effectively preventing the electrode from slipping or the diaphragm from wrinkling, and ensuring the accuracy of the peeling force value acquisition.

[0038] Reference Figure 1 and Figure 2 The L-shaped seat 4 is equipped with a tester 8. In this embodiment, the tester 8 is used to detect the bonding strength between the electrode and the diaphragm. The tester 8 is coaxially linked with the drive shaft of the hydraulic cylinder 3. The peeling force value is directly transmitted to the control system through the sensor, eliminating the mechanical transmission error of the traditional external force measuring device. The tester has high accuracy and reliable data.

[0039] Reference Figure 1 and Figure 2 The tester 8 is equipped with an assembly strip 9, and the L-shaped seat 4 has an assembly groove 10. The assembly strip 9 is adapted to the inner wall of the assembly groove 10. This improves the equipment assembly efficiency. The assembly strip 9 and the assembly groove 10 work together to ensure the installation stability of the tester 8 and ensure that it will not loosen during long-term operation.

[0040] The implementation principle of the tensile testing machine for hot-pressed core compaction testing in this application embodiment is as follows: When testing the compaction effect of the core after hot pressing, after Hipot short-circuit testing and confirming whether the thickness and width meet the design specifications, sample preparation is carried out. Starting from the outer circle of the core, diaphragm / positive electrode bonding sheet samples are cut every N folds to ensure that the sample size meets the MD and TD requirements. The sample number and test point are marked. The upper pneumatic gripper 5 is used to clamp the electrode sheet, and the lower pneumatic gripper 6 is used to clamp the diaphragm. The hydraulic cylinder 3 is started to perform a peel test at a set speed (e.g., 50mm / min). The peel force value is recorded. If the peel strength is lower than the set standard, it is judged as NG. If it is higher than the standard, it is judged as OK, thus realizing the compaction test. At the same time, the air permeability test can be performed by the corresponding testing instrument 8 to determine if the hot pressing plate or core level is abnormal, thus ensuring quality.

[0041] By incorporating hydraulic cylinders 3, L-shaped seats 4, upper pneumatic grippers 5, and lower pneumatic grippers 6, this equipment significantly improves inspection accuracy through a mechanically automated process compared to traditional visual inspection methods. The solution effectively avoids interference from human factors and ambient light through the precise drive of hydraulic cylinders 3, the stable guidance of L-shaped seats 4, and the reliable clamping of pneumatic grippers. This achieves consistent evaluation of the compaction effect at each point of hot pressing, greatly enhancing the objectivity and reliability of the inspection results.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drawbench for use in the detection of compaction of hot pressed logs, characterised in that: The device includes a base, on which a frame is mounted. A hydraulic cylinder is vertically arranged on the frame. An L-shaped seat is mounted on the output end of the hydraulic cylinder. The L-shaped seat is slidably connected to the frame. An upper pneumatic gripper for gripping electrode sheets is mounted at the bottom of the L-shaped seat. A lower pneumatic gripper for gripping diaphragms is mounted on the base. The upper pneumatic gripper is positioned directly above the lower pneumatic gripper, and the gripping ends of the upper and lower pneumatic grippers are arranged opposite each other.

2. The tension machine for detecting the compaction of hot-pressing roll cores according to claim 1, characterized in that: Both the upper and lower pneumatic grippers are provided with corrugated grooves for anti-slip purposes, and the two corrugated grooves are respectively opened at the gripping ends of the upper and lower pneumatic grippers.

3. The tension machine for detecting the compaction of hot-pressing roll cores according to claim 1, characterized in that: The L-shaped base is equipped with a tester for detecting the bonding strength between the electrode and the diaphragm, and the tester is vertically arranged on the L-shaped base.

4. The hot press core compact detection tensile machine according to claim 3, characterized in that: The testing instrument is equipped with an assembly strip, and the L-shaped base has an assembly groove for fitting the assembly strip.

5. The hot press core compact detection tensile machine according to claim 1, characterized in that: The frame is provided with a fixed guide rail, which is arranged along the height of the frame. The L-shaped seat is provided with a sliding block, which is slidably connected to the fixed guide rail.

6. The pull tester for compact detection of hot-pressed roll cores according to claim 5, characterized in that: The fixed guide rail is provided with a collision protection plate at its end for controlling the stroke, and the collision protection plate is connected to the frame.

7. A tensile testing machine for hot-pressed core compaction testing according to claim 1, characterized in that: The base is provided with a guide slide rail, and the bottom of the frame is provided with a mating groove, the guide slide rail being adapted to the inner wall of the mating groove.

8. A tensile testing machine for hot-pressed core compaction testing according to claim 7, characterized in that: Several fastening bolts are provided between the frame and the base for fixing.

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