New energy automobile battery packaging steel belt size tension detection device and method

Abstract

The invention relates to the technical field of battery steel strip testing, in particular to a new energy automobile battery packaging steel strip size tension detection device and method.The new energy automobile battery packaging steel strip size tension detection device comprises a rack, a fixed jig, a transmission mechanism, a movable jig and a detection mechanism, and the transmission mechanism is arranged on the rack and arranged in the length direction of the rack; the fixed jig is arranged at one end of the rack, the movable jig is arranged on the transmission mechanism, the transmission mechanism is used for driving the movable jig to relatively move towards the fixed jig, and the detection mechanisms are arranged on the rack, located on the two sides of the transmission mechanism and used for detecting the stretching appearance of the battery packaging steel belt. The fixed jig is provided with a first positioning table, and the movable jig is provided with a second positioning table. The new energy automobile battery packaging steel belt detection device integrates the functions of tension, size and appearance detection, can comprehensively and efficiently test the new energy automobile battery packaging steel belt, and can effectively guarantee the quality and safety of the new energy automobile battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery steel strip testing, and in particular to a device and method for detecting the size and tension of steel strips for battery packaging of new energy vehicles. Background Art

[0002] Amidst growing environmental awareness and energy transitions, new energy vehicles (NEVs), with their significant advantages of low pollution and high efficiency, have become a key development direction for the global automotive industry. As a core component of NEVs, battery performance and safety directly impact the overall quality and user experience of these vehicles. The steel strips used to package NEV batteries play a crucial role in the battery packaging process. They must not only ensure a tight seal and prevent electrolyte leakage, but also possess sufficient strength and stability to protect the batteries from damage in a variety of challenging operating environments.

[0003] To ensure the quality of steel strips used in new energy vehicle battery packaging meets requirements, a series of rigorous tests are required during the production process. Tensile testing assesses the strength and toughness of the steel strips when subjected to external forces, ensuring they will not break due to excessive tension in actual use. Appearance testing checks for surface defects such as scratches, cracks, and rust, preventing these defects from affecting the strip's protective properties and aesthetics. Dimensional testing ensures that the strip's width, thickness, length, and other dimensional parameters meet design standards, ensuring a perfect fit for the battery.

[0004] However, existing testing methods have serious drawbacks. Tensile, appearance, and dimensional tests are performed separately, requiring independent equipment and procedures for each. This means that the steel strip needs to be moved between different testing stations throughout the production line multiple times, increasing material handling time and costs while also causing additional damage to the strip during handling, affecting the accuracy of test results. Summary of the Invention

[0005] To solve the above problems, the present invention integrates the functions of tension, size and appearance detection, and can comprehensively and efficiently test the steel strips for new energy vehicle battery packaging. It can effectively ensure the quality and safety of new energy vehicle batteries and is a new energy vehicle battery packaging steel strip size and tension detection device and method.

[0006] The technical solution adopted by the present invention is: a new energy vehicle battery packaging steel strip size tension detection device, including a frame, a fixed jig, a transmission mechanism, a movable jig and a detection mechanism, the transmission mechanism is arranged on the frame and arranged along the length direction of the frame, the fixed jig is arranged at one end of the frame, the movable jig is arranged on the transmission mechanism, the transmission mechanism is used to drive the movable jig to move relative to the fixed jig, the detection mechanism is arranged on the frame and on both sides of the transmission mechanism, for detecting the tensile appearance of the battery packaging steel strip, the fixed jig is provided with a first positioning platform, and the movable jig is provided with a second positioning platform; the battery packaging steel strip is a rectangular steel strip, and the two ends are connected by welding. The first positioning platform and the second positioning platform are respectively used to position the two ends of the battery packaging steel strip, and the first positioning platform and / or the second positioning platform are provided with a tension detection sensing element to detect the tension generated by the transmission mechanism during the pulling of the battery packaging steel strip.

[0007] A further improvement to the above scheme is that the fixing fixture includes a side plate arranged on the frame and a support panel arranged on the side plate, the first positioning platform is arranged on the support panel, and a first positioning surface is provided on one side of the first positioning platform, and the first positioning surface is used to fix one end of the battery packaging steel strip.

[0008] A further improvement to the above solution is that the first positioning platform includes a first positioning substrate and a first positioning block, the first positioning block is arranged on the first positioning substrate, the first positioning substrate is used to support the bottom surface of the battery packaging steel strip, and the first positioning surface is arranged on one side of the first positioning block.

[0009] A further improvement to the above scheme is that the movable fixture includes a second positioning substrate and a second positioning block, the first positioning substrate is arranged on the transmission mechanism, the second positioning block is arranged on the second positioning substrate, a second positioning surface is provided on one side of the second positioning block, the second positioning substrate is used to support the bottom surface of the battery packaging steel strip, and the second positioning surface and the first positioning surface form a rectangular shape relative to each other.

[0010] A further improvement to the above scheme is that the transmission mechanism includes a linear transmission module, the linear transmission module is provided with a transmission seat, the linear transmission module is used to drive the transmission seat for linear transmission, the linear transmission module is a linear motor module, and the movable fixture is provided on the transmission seat.

[0011] A further improvement to the above scheme is that the detection mechanism includes a detection bracket, a detection connecting rod, a detection adjustment seat and a detection probe, the detection bracket is arranged on the frame, the detection connecting rod is arranged on the detection bracket, the detection adjustment seat is arranged on the detection connecting rod, and the detection probe is used to detect the tensile flatness of the battery packaging steel strip.

[0012] A further improvement to the above solution is that the detection mechanism is provided with multiple groups, corresponding to multiple positions of the battery packaging steel strip.

[0013] A detection method based on a new energy vehicle battery packaging steel strip size tension detection device is characterized by comprising the following steps: Step S1, positioning the steel strip: fixing the two ends of the rectangular battery packaging steel strip welded into a closed loop on the first positioning platform of the fixed fixture and the second positioning platform of the movable fixture respectively; Step S2, applying tension: driving the movable jig to move away from the fixed jig along the length direction of the frame through the transmission mechanism, thereby applying axial tensile force to the steel strip; Step S3, synchronous detection: During the stretching process, the following parallel operations are performed: Step 3.1, monitoring the tension value of the steel strip in real time by means of a tension detection sensing element provided on the first positioning platform and / or the second positioning platform; Step 3.2: Scan the surface of the steel strip at multiple locations using the detection mechanisms on both sides of the frame to obtain the dimensional change data and surface flatness of the steel strip under tension; Step S4, outputting the results: generating a report on the steel strip's dimensional deformation, tensile strength, and appearance defects based on the monitoring data from step S3.

[0014] A further improvement to the above scheme is that the dimensional detection in step 3.2 specifically includes: synchronous measurement of at least three equidistant positions in the width direction of the steel strip through an adjustable detection probe; dynamic adjustment of the probe height to adapt to the deformation surface of the steel strip based on the cooperation between the detection connecting rod and the detection adjustment seat; calculation of the offset of each measurement point from the reference plane to determine whether the lateral dimensional stability and flatness of the steel strip meet the standards.

[0015] A further improvement to the above scheme is that the tension monitoring in step 3.1 includes: recording the real-time numerical change curve of the tension detection sensing element during the process of the transmission mechanism driving the movable fixture to move at a uniform speed; when the tension value reaches the preset threshold, triggering the system alarm and recording the tensile displacement of the steel strip at this time; combining the displacement and the peak tension to calculate the elastic modulus and yield strength parameters of the steel strip.

[0016] The beneficial effects of the present invention are: Compared with the existing battery packaging steel strip detection, the present invention realizes the rigid clamping of the rectangular battery packaging steel strip welded into a closed loop through the two-way positioning design of the fixed fixture and the movable fixture, which solves the problem of unstable positioning and easy slippage of the traditional fixture caused by the ring structure of the steel strip, and ensures the precise alignment of the force axis in the tensile test. Through the integrated layout of the linear displacement of the movable fixture driven by the transmission mechanism and the tension detection sensing element, the in-situ real-time monitoring of the tension data during the stretching process is realized, avoiding the measurement error introduced by the external sensor. At the same time, combined with the multi-position synchronous scanning of the steel strip surface by the detection mechanism, the three-dimensional data of dimensional deformation, tensile tolerance and appearance defects in a single test is achieved through the coordinated collection. Through the symmetrical distribution of the detection mechanism along both sides of the transmission mechanism and the adjustable probe design, the full-area flatness monitoring of the steel strip in the width direction under dynamic tension is realized, and local warping, cracks and other defects are accurately captured, overcoming the blind spot of the field of view of single-point detection, making the quality judgment reliable. Through the synergistic effect of the high-precision displacement control of the linear motor module and the positioning stage, constant-speed / variable-speed tensile testing is achieved with micron-level displacement resolution. This can reproduce the fatigue response of battery packaging steel strips under actual working conditions and provide an industrial-grade verification environment for material mechanical property analysis.

[0017] For tension testing, the device uses a transmission mechanism to drive a movable fixture relative to a fixed fixture, applying tension to the battery packaging steel strip. Simultaneously, tension sensing elements are installed on the first and / or second positioning platforms to accurately measure the tension applied to the battery packaging steel strip during the pulling process. This helps accurately assess the tensile strength of the battery packaging steel strip, ensuring that it can withstand normal stress without fracture during actual use of new energy vehicle batteries, thereby ensuring the structural stability and safety of the battery.

[0018] For dimensional inspection, the first and second positioning platforms on the fixed and movable jigs precisely position the ends of the rectangular, welded battery packaging steel strip. During tensile testing, the strip's dimensional changes, such as elongation, can be simultaneously detected, helping to determine whether it meets the dimensional requirements for new energy vehicle battery packaging.

[0019] For appearance inspection, a detection mechanism is installed on the frame and located on both sides of the transmission mechanism. This allows real-time monitoring of the stretched appearance of the battery packaging steel strip during its stretching process. This allows for timely detection of appearance defects such as cracks and deformation during the stretching process, preventing the use of battery packaging steel strips with appearance quality issues in new energy vehicle batteries and improving the overall quality and reliability of new energy vehicle batteries. This invention integrates tensile force, dimensional, and appearance inspection functions, enabling comprehensive and efficient testing of new energy vehicle battery packaging steel strips, effectively ensuring the quality and safety of new energy vehicle batteries.

[0020] The detection method based on the dimensional tension detection device of steel strips for battery packaging of new energy vehicles realizes the axial rigid fixation of the annular welded steel strips through the synchronous positioning mechanism of the two ends of the closed-loop steel strips on the fixed / movable fixtures, eliminates the stress concentration caused by the traditional segmented clamping, ensures that the tensile force is strictly transmitted along the length direction of the steel strip, and improves the reliability of the test data. Through the parallel working mode of the tension sensing element and the surface detection mechanism, the coordinated capture of the mechanical properties and deformation characteristics during a single stretching process is realized, and a correlation model of tension, deformation, and surface defects is directly established to solve the industry problem that traditional step-by-step detection cannot reflect dynamic deformation defects. Through the data fusion of multi-position appearance scanning and real-time tension monitoring, the generation of a full-domain quality portrait of the steel strip in the tensile state is realized: accurate dimensional change in the width direction, surface flatness defect identification, and tensile strength tolerance analysis; the upgrade of the test results from "single parameter judgment" to "multi-dimensional performance evaluation" is realized, and the dimensional deformation, yield strength threshold, and defect distribution thermal stress are directly output. Figure 3 Heavy industry parameters make quality decision-making more efficient.

[0021] During the steel strip positioning step, the ends of the rectangular battery packaging steel strip, welded into a closed loop, are precisely secured to the first positioning platform of the fixed jig and the second positioning platform of the movable jig. This precise positioning ensures uniform stress on the steel strip during subsequent tensile testing, avoiding test errors caused by positioning deviations and ensuring that test results truly reflect the actual performance of the battery packaging steel strip. A transmission mechanism drives the movable jig along the length of the frame, away from the fixed jig, to apply axial tensile force to the steel strip. This simulates the tensile stress experienced by the battery packaging steel strip during actual use, ensuring a comprehensive and accurate assessment of its tensile properties. The stable and controllable tensile application process facilitates the precise determination of the steel strip's tensile strength, providing a reliable basis for the design and manufacture of new energy vehicle battery packaging. Simultaneous testing is performed during the stretching process. Tension sensing elements located on the first and / or second positioning platforms monitor the tensile force applied to the steel strip in real time. This accurately captures changes in the force applied to the steel strip during stretching, allowing for the timely identification of potential strength issues. Furthermore, inspection mechanisms on both sides of the machine frame perform multi-position surface scans of the steel strip, capturing data on dimensional changes and surface flatness during the stretched state. This multi-dimensional, simultaneous inspection method comprehensively assesses the steel strip's performance during the stretching process, not only verifying whether the strip's strength meets standards but also identifying surface defects such as cracks and deformation, and whether dimensional changes meet design requirements. This significantly enhances the comprehensiveness and accuracy of inspections. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional schematic diagram of the device for detecting the size and tension of steel strips for packaging batteries of new energy vehicles according to the present invention; Figure 2 for Figure 1 A three-dimensional schematic diagram from another perspective of the new energy vehicle battery packaging steel strip dimensional tension detection device; Figure 3 for Figure 1 A top view of the tensile testing device for steel strip dimensions in new energy vehicle battery packaging; Figure 4 for Figure 1 Schematic diagram of the partial structure of the dimensional tension detection device for steel strips packaged for new energy vehicle batteries; Figure 5 for Figure 1 A three-dimensional schematic diagram of the testing mechanism of the new energy vehicle battery packaging steel strip dimensional tension testing device; Figure 6 The present invention is a flow chart of a detection method based on a device for detecting the size and tension of steel strips for packaging batteries of new energy vehicles.

[0023] Explanation of the accompanying drawings: frame 1, fixed fixture 2, first positioning platform 21, first positioning surface 211, first positioning substrate 212, first positioning block 213, side panel 22, support panel 23, transmission mechanism 3, transmission seat 31, movable fixture 4, second positioning platform 41, second positioning substrate 42, second positioning block 43, second positioning surface 431, detection mechanism 5, detection bracket 51, detection connecting rod 52, detection adjustment seat 53, detection probe 54, tension detection sensing element 6. DETAILED DESCRIPTION

[0024] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0025] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Figures 1 to 6As shown, in one embodiment of the present invention, a device for detecting the size and tension of a steel strip for battery packaging of a new energy vehicle is provided, comprising a frame 1, a fixed jig 2, a transmission mechanism 3, a movable jig 4 and a detection mechanism 5. The transmission mechanism 3 is provided on the frame 1 and arranged along the length direction of the frame 1. The fixed jig 2 is provided at one end of the frame 1, and the movable jig 4 is provided on the transmission mechanism 3. The transmission mechanism 3 is used to drive the movable jig 4 to move relative to the fixed jig 2. The detection mechanism 5 is provided on the frame 1 and on both sides of the transmission mechanism 3, and is used to detect the tensile appearance of the battery packaging steel strip. The fixed jig 2 is provided with a first positioning platform 21, and the movable jig 4 is provided with a second positioning platform 41. The battery packaging steel strip is a rectangular steel strip, and the two ends are connected by welding. The first positioning platform 21 and the second positioning platform 41 are respectively used to position the two ends of the battery packaging steel strip. The first positioning platform 21 and / or the second positioning platform 41 are provided with a tension detection sensing element 6 to detect the tension generated by the transmission mechanism 3 during the pulling process of the battery packaging steel strip. This embodiment achieves rigid clamping of rectangular battery packaging steel strips welded into a closed loop through the bidirectional positioning design of the fixed fixture 2 and the movable fixture 4. This solves the problem of unstable positioning and easy slippage caused by the ring structure of the steel strip in traditional fixtures, ensuring precise alignment of the force axis during tensile testing. The integrated layout of the linear displacement of the movable fixture 4 driven by the transmission mechanism 3 and the tensile detection sensing element 6 enables in-situ real-time monitoring of tensile data during the stretching process, avoiding measurement errors introduced by external sensors. Simultaneously, the detection mechanism 5 simultaneously scans the steel strip surface at multiple positions, achieving coordinated three-dimensional data collection of dimensional deformation, tensile resistance, and appearance defects in a single test. The symmetrical distribution of the detection mechanism 5 along both sides of the transmission mechanism 3 and the design of the adjustable probe enable full-width flatness monitoring of the steel strip under dynamic tension, accurately capturing defects such as local warping and cracks, overcoming the blind spots of single-point detection and ensuring reliable quality judgment. Through the synergistic effect of the high-precision displacement control of the linear motor module and the positioning stage, constant-speed / variable-speed tensile testing is achieved with micron-level displacement resolution. This can reproduce the fatigue response of battery packaging steel strips under actual working conditions and provide an industrial-grade verification environment for material mechanical property analysis.

[0027] For tension testing, the device uses a transmission mechanism 3 to drive a movable jig 4 relative to a fixed jig 2, applying tension to the battery packaging steel strip. Simultaneously, tension detection sensors 6 are installed on the first positioning platform 21 and / or the second positioning platform 41 to accurately measure the tension applied to the battery packaging steel strip during the pulling process. This helps accurately assess the tensile strength of the battery packaging steel strip, ensuring that it can withstand normal stress without breaking during actual use of new energy vehicle batteries, thereby ensuring the structural stability and safety of the battery.

[0028] For dimensional testing, the first and second positioning platforms 21 and 41 on the fixed and movable jigs 2 and 4 precisely position the ends of the rectangular, welded battery packaging steel strip. During tensile testing, the strip's dimensional changes, such as elongation, can be simultaneously detected, helping to determine whether it meets the dimensional requirements for new energy vehicle battery packaging.

[0029] For appearance testing, the inspection mechanism 5 is mounted on the frame 1 and located on both sides of the transmission mechanism 3. This allows real-time monitoring of the stretched appearance of the battery packaging steel strip during its stretching process. This allows for timely detection of appearance defects such as cracks and deformation during the stretching process, preventing the use of battery packaging steel strips with appearance quality issues in new energy vehicle batteries and improving the overall quality and reliability of new energy vehicle batteries. This invention integrates tensile force, dimensional, and appearance testing capabilities, enabling comprehensive and efficient testing of new energy vehicle battery packaging steel strips, effectively ensuring the quality and safety of new energy vehicle batteries.

[0030] The fixed fixture 2 includes a side plate 22 mounted on the frame 1 and a support panel 23 mounted on the side plate 22. The first positioning platform 21 is mounted on the support panel 23. A first positioning surface 211 is provided on one side of the first positioning platform 21. The first positioning surface 211 is used to secure one end of the battery packaging steel strip. Specifically, the first positioning platform 21 includes a first positioning base plate 212 and a first positioning block 213. The first positioning block 213 is mounted on the first positioning base plate 212. The first positioning base plate 212 supports the bottom surface of the battery packaging steel strip. The first positioning surface 211 is provided on one side of the first positioning block 213. The movable fixture 4 includes a second positioning base plate 42 and a second positioning block 43. The first positioning base plate 212 is mounted on the transmission mechanism 3. The second positioning block 43 is mounted on the second positioning base plate 42. A second positioning surface 431 is provided on one side of the second positioning block 43. The second positioning base plate 42 supports the bottom surface of the battery packaging steel strip. The second positioning surface 431 forms a rectangular shape relative to the first positioning surface 211. In this embodiment, the first positioning platform 21 of the fixed jig 2 and the second positioning platform 41 of the movable jig 4 can achieve precise positioning of the battery packaging steel strip. The first positioning surface 211 of the first positioning platform 21 and the second positioning surface 431 of the second positioning block 43 of the movable jig 4 form a rectangular shape that matches the rectangular shape of the battery packaging steel strip. The first positioning base plate 212 and the second positioning base plate 42 respectively support the bottom surface of the battery packaging steel strip. This ensures that the battery packaging steel strip is firmly and precisely placed in the device before the test begins, ensuring the position accuracy of the steel strip's ends when subjected to force, avoiding test deviations caused by inaccurate positioning, and ensuring that the test results can truly reflect the tensile performance of the steel strip. The first positioning base plate 212 and the second positioning base plate 42 respectively provide stable bottom surface support for the two ends of the battery packaging steel strip. During the tensile test, the battery packaging steel strip will be subjected to large tensile forces. The stable bottom surface support can prevent the steel strip from warping or deflecting when subjected to force, allowing the steel strip to maintain a stable posture throughout the stretching process. It helps to ensure that the tension is evenly applied to the steel strip, avoiding local stress concentration from interfering with the test results, thereby improving the reliability and repeatability of the test.

[0031] The transmission mechanism 3 includes a linear transmission module, which is provided with a transmission base 31. The linear transmission module is used to drive the transmission base 31 in a linear transmission. The linear transmission module is a linear motor module, and the movable fixture 4 is disposed on the transmission base 31. In this embodiment, the linear motor module serves as a linear transmission module and can provide high-precision linear transmission for the movable fixture 4. During the tension test of the battery packaging steel strip, the precise linear transmission enables the movable fixture 4 to move toward the fixed fixture 2 according to a preset trajectory and speed, thereby applying precise tension to the battery packaging steel strip. This is crucial for accurately simulating the tension experienced by the battery packaging steel strip during actual use of new energy vehicle batteries, ensuring that the test results truly reflect the mechanical properties of the steel strip and providing an accurate basis for evaluating its quality and reliability. During the tension test, when tension needs to be applied to the battery packaging steel strip, the linear motor module can quickly start and drive the transmission base 31 and the movable fixture 4 to move, quickly applying tension to the steel strip. This makes the testing process more efficient and enables the tensile test of battery packaging steel strips to be completed in a short time, thus improving the testing efficiency and meeting the demand for rapid testing of battery packaging steel strips during the large-scale production of new energy vehicles.

[0032] See Figure 5 As shown, the detection mechanism 5 includes a detection bracket 51, a detection connecting rod 52, a detection adjustment seat 53 and a detection probe 54. The detection bracket 51 is arranged on the frame 1, the detection connecting rod 52 is arranged on the detection bracket 51, the detection adjustment seat 53 is arranged on the detection connecting rod 52, and the detection probe 54 is used to detect the tensile flatness of the battery packaging steel strip. Specifically, the detection mechanism 5 is provided with multiple groups, which correspond to multiple positions of the battery packaging steel strip. In this embodiment, the detection probe 54 is a CCD detection camera, and the detection mechanism 5 is provided with multiple groups, which correspond to multiple positions of the battery packaging steel strip. During the tensile test, the flatness changes of various parts of the battery packaging steel strip can be captured by the detection probe 54. Since the battery packaging steel strip of new energy vehicles needs to maintain good flatness during use to ensure stable packaging and safe operation of the battery. Multiple sets of detection mechanisms 5 fully cover the steel strip, enabling timely detection of any unevenness, such as localized bulges or depressions, that may occur under tension. This provides a comprehensive and accurate basis for determining whether the steel strip meets the flatness requirements for new energy vehicle battery packaging. A detection bracket 51 is fixed to the frame 1, providing stable support for the entire detection mechanism 5. A detection connecting rod 52 is mounted on the detection bracket 51, and a detection adjustment seat 53 is further mounted on the detection connecting rod 52. By adjusting the position of the detection adjustment seat 53 on the detection connecting rod 52, as well as the position of the detection connecting rod 52 relative to the detection bracket 51, the detection probe 54 can be precisely positioned to the specific detection area of ​​the battery packaging steel strip.

[0033] like Figures 1 to 6As shown, a detection method based on a new energy vehicle battery packaging steel strip size tension detection device is characterized in that it includes the following steps: Step S1, positioning the steel strip: fixing the two ends of the rectangular battery packaging steel strip welded into a closed loop on the first positioning platform 21 of the fixed fixture 2 and the second positioning platform 41 of the movable fixture 4 respectively; Step S2, applying tension: driving the movable jig 4 to move away from the fixed jig 2 along the length direction of the frame 1 through the transmission mechanism 3, thereby applying an axial tensile force to the steel strip; Step S3, synchronous detection: During the stretching process, the following parallel operations are performed: Step 3.1, the tension value of the steel strip is monitored in real time by the tension detection sensing element 6 installed on the first positioning platform 21 and / or the second positioning platform 41; Step 3.2, the detection mechanism 5 on both sides of the frame 1 performs a multi-position appearance scan of the steel strip surface to obtain the dimensional change data and surface flatness of the steel strip under the stretching state; Step S4, outputting the results: generating a report on the steel strip's dimensional deformation, tensile strength, and appearance defects based on the monitoring data from step S3.

[0034] In this embodiment, the axial rigid fixation of the annular welded steel strip is achieved through the synchronous positioning mechanism of the two ends of the closed-loop steel strip on the fixed / movable fixture 4, eliminating the stress concentration caused by the traditional segmented clamping, ensuring that the tensile force is strictly transmitted along the length direction of the steel strip, and improving the reliability of the test data. Through the parallel working mode of the tension sensing element and the surface detection mechanism 5, the coordinated capture of mechanical properties and deformation characteristics in a single stretching process is achieved, and a correlation model of tension, deformation, and surface defects is directly established to solve the industry problem that traditional step-by-step detection cannot reflect dynamic deformation defects. Through the data fusion of multi-position appearance scanning and real-time tension monitoring, the generation of a full-domain quality portrait of the steel strip in a tensile state is achieved: accurate dimensional change in the width direction, surface flatness defect identification, and tensile strength tolerance analysis; the upgrade of the test results from "single parameter judgment" to "multi-dimensional performance evaluation" is achieved, and the dimensional deformation, yield strength threshold, and defect distribution thermal conductivity are directly output. Figure 3 Heavy industry parameters make quality decision-making more efficient.

[0035] During the steel strip positioning step, the ends of the rectangular battery packaging steel strip, welded into a closed loop, are precisely fixed to the first positioning platform 21 of the fixed jig 2 and the second positioning platform 41 of the movable jig 4. This precise positioning ensures uniform stress on the steel strip during subsequent tensile testing, avoiding test errors caused by positioning deviations and ensuring that test results truly reflect the actual performance of the battery packaging steel strip. The movable jig 4 is driven by the transmission mechanism 3 along the length of the frame 1, away from the fixed jig 2, to apply an axial tensile force to the steel strip. This simulates the tensile stress experienced by the battery packaging steel strip during actual use, ensuring a comprehensive and accurate assessment of its tensile properties. The stable and controllable tensile application process facilitates the precise determination of the steel strip's tensile strength, providing a reliable basis for mechanical performance analysis in the design and manufacture of new energy vehicle battery packaging. Simultaneous testing is performed during the stretching process. Tension sensing elements 6, located on the first positioning platform 21 and / or the second positioning platform 41, monitor the tensile force applied to the steel strip in real time. This accurately captures changes in the force applied to the steel strip during the stretching process, allowing for the timely identification of potential strength issues. Furthermore, inspection mechanisms 5 on both sides of frame 1 perform multi-position surface scans of the steel strip, capturing data on its dimensional changes and surface flatness under tension. This multi-dimensional, simultaneous inspection method comprehensively assesses the steel strip's performance during the tensioning process. It not only verifies whether the strip's strength meets standards, but also identifies surface defects such as cracks and deformation, as well as whether dimensional changes meet design requirements. This significantly enhances the comprehensiveness and accuracy of inspections.

[0036] The dimensional detection in step 3.2 specifically includes: synchronously measuring at least three equidistant positions in the width direction of the steel strip through the adjustable detection probe 54; dynamically adjusting the probe height to adapt to the deformation surface of the steel strip according to the cooperation between the detection connecting rod 52 and the detection adjustment seat 53; calculating the offset between each measurement point and the reference plane to determine whether the lateral dimensional stability and flatness of the steel strip meet the standards. In this embodiment, by synchronously measuring at least three equidistant positions in the width direction of the steel strip through the adjustable detection probe 54, comprehensive dimensional information in the width direction of the steel strip can be obtained. Under the action of tension, the width changes of the steel strip at different positions may vary. Multi-point synchronous measurement can capture this change. Compared with single-point measurement, it can more accurately reflect the actual situation of the overall width of the steel strip and avoid the problem of inaccurate judgment of the steel strip width size due to local measurement errors. Ensure that the width of the battery packaging steel strip meets the packaging requirements of new energy vehicle batteries.

[0037] During the tensile test, the steel strip deforms, forming a curved surface. The probe height is dynamically adjusted to accommodate the curved surface of the steel strip, thanks to the coordination between the detection link 52 and the detection adjustment base 53. This ensures that the detection probe 54 maintains good contact with the steel strip surface and an effective detection distance. This ensures that even if the steel strip undergoes complex deformation during the tensile test, the detection probe 54 can accurately measure the actual dimensions of the steel strip surface, avoiding measurement deviations caused by inappropriate distance between the probe and the steel strip surface, thereby improving the accuracy and reliability of dimensional detection.

[0038] The tension monitoring in step 3.1 includes: recording the real-time value curve of the tension detection sensing element 6 while the transmission mechanism 3 drives the movable fixture 4 to move at a constant speed; triggering a system alarm when the tension value reaches a preset threshold and recording the tensile displacement of the steel strip at that time; and calculating the elastic modulus and yield strength parameters of the steel strip by combining the displacement and the peak tension value. In this embodiment, recording the real-time value curve of the tension detection sensing element 6 while the transmission mechanism 3 drives the movable fixture 4 at a constant speed provides a comprehensive and accurate picture of the tension change over time or displacement during the tension test of the battery packaging steel strip. This curve clearly demonstrates the stress characteristics of the steel strip at different stretching stages, such as the upward trend and fluctuation of the tension. This facilitates analysis of the mechanical response of the steel strip during the stress process, providing detailed data for subsequent performance evaluation and quality assessment. When the tension value reaches the preset threshold, the system triggers an alarm and records the tensile displacement of the steel strip at that time. The preset threshold is set based on the design requirements and safety standards of the steel strip for new energy vehicle battery packaging. When the tension reaches this threshold, it means that the steel strip may be approaching its endurance limit. Timely alarms alert operators to the test status, preventing damage to the steel strip or testing equipment caused by overstretching. Recording the tensile displacement provides key data for evaluating the steel strip's deformation capacity under specific tension, helping to determine whether the steel strip meets the requirements for new energy vehicle battery packaging.

[0039] The above embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A new energy vehicle battery packaging steel strip size tension detection device, characterized by: It includes a frame, a fixed jig, a transmission mechanism, a movable jig and a detection mechanism. The transmission mechanism is arranged on the frame and along the length direction of the frame. The fixed jig is arranged at one end of the frame, and the movable jig is arranged on the transmission mechanism. The transmission mechanism is used to drive the movable jig to move relative to the fixed jig. The detection mechanism is arranged on the frame and located on both sides of the transmission mechanism, and is used to detect the stretching appearance of the battery packaging steel strip. The fixed jig is provided with a first positioning platform, and the movable jig is provided with a second positioning platform. The battery packaging steel strip is a rectangular steel strip, and the two ends are connected by welding. The first positioning platform and the second positioning platform are respectively used to position the two ends of the battery packaging steel strip. The first positioning platform and / or the second positioning platform are provided with a tension detection sensing element to detect the tension generated by the transmission mechanism during the pulling of the battery packaging steel strip.

2. The new energy vehicle battery packaging steel strip size and tension detection device according to claim 1 is characterized in that: The fixing fixture includes a side plate arranged on the frame and a support panel arranged on the side plate, the first positioning platform is arranged on the support panel, and a first positioning surface is provided on one side of the first positioning platform, and the first positioning surface is used to fix one end of the battery packaging steel strip.

3. The new energy vehicle battery packaging steel strip size and tension detection device according to claim 2 is characterized in that: The first positioning platform includes a first positioning substrate and a first positioning block. The first positioning block is arranged on the first positioning substrate. The first positioning substrate is used to support the bottom surface of the battery packaging steel strip. The first positioning surface is arranged on one side of the first positioning block.

4. The new energy vehicle battery packaging steel strip dimensional tension detection device according to claim 3 is characterized in that: The movable fixture includes a second positioning substrate and a second positioning block. The first positioning substrate is arranged on the transmission mechanism, and the second positioning block is arranged on the second positioning substrate. A second positioning surface is provided on one side of the second positioning block. The second positioning substrate is used to support the bottom surface of the battery packaging steel strip. The second positioning surface and the first positioning surface form a rectangular shape relative to each other.

5. The new energy vehicle battery packaging steel strip size and tension detection device according to claim 1 is characterized in that: The transmission mechanism includes a linear transmission module, the linear transmission module is provided with a transmission seat, the linear transmission module is used to drive the transmission seat for linear transmission, the linear transmission module is a linear motor module, and the movable fixture is provided on the transmission seat.

6. The new energy vehicle battery packaging steel strip dimensional tension detection device according to claim 1 is characterized in that: The detection mechanism includes a detection bracket, a detection connecting rod, a detection adjustment seat and a detection probe. The detection bracket is set on the frame, the detection connecting rod is set on the detection bracket, the detection adjustment seat is set on the detection connecting rod, and the detection probe is used to detect the tensile flatness of the battery packaging steel strip.

7. The device for detecting the size and tension of steel strips for packaging batteries of new energy vehicles according to claim 6 is characterized in that: The detection mechanism is provided with multiple groups, corresponding to multiple positions of the battery packaging steel strip.

8. A detection method based on the device for detecting the size and tension of steel strips for battery packaging of new energy vehicles according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, positioning the steel strip: fixing the two ends of the rectangular battery packaging steel strip welded into a closed loop on the first positioning platform of the fixed fixture and the second positioning platform of the movable fixture respectively; Step S2, applying tension: driving the movable jig to move away from the fixed jig along the length direction of the frame through the transmission mechanism, thereby applying axial tensile force to the steel strip; Step S3, synchronous detection: During the stretching process, the following parallel operations are performed: Step 3.1, monitoring the tension value of the steel strip in real time by means of a tension detection sensing element provided on the first positioning platform and / or the second positioning platform; Step 3.2: Scan the surface of the steel strip at multiple locations using the detection mechanisms on both sides of the frame to obtain the dimensional change data and surface flatness of the steel strip under tension; Step S4, outputting the results: generating a report on the steel strip's dimensional deformation, tensile strength, and appearance defects based on the monitoring data from step S3.

9. The detection method based on the new energy vehicle battery packaging steel strip size tension detection device according to claim 8 is characterized in that: The size detection in step 3.2 specifically includes: Synchronous measurement of at least three equidistant positions in the width direction of the steel strip is performed by means of an adjustable detection probe; According to the cooperation between the detection connecting rod and the detection adjustment seat, the probe height is dynamically adjusted to adapt to the deformation surface of the steel strip; Calculate the offset between each measuring point and the reference plane to determine whether the transverse dimensional stability and flatness of the steel strip meet the standards.

10. The detection method based on the new energy vehicle battery packaging steel strip size tension detection device according to claim 8, characterized in that: The tension monitoring in step 3.1 includes: When the transmission mechanism drives the movable fixture to move at a constant speed, the real-time value change curve of the tension detection sensing element is recorded; When the tension value reaches the preset threshold, the system alarm is triggered and the tensile displacement of the steel belt at this time is recorded; The elastic modulus and yield strength parameters of the steel strip are calculated based on the displacement and peak tensile force.

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