High-temperature detection method and device for composite film for battery module

Abstract

The invention relates to the technical field of battery module detection, and discloses a high-temperature detection method and device for a composite film for a battery module, and the device comprises a detection assembly, a cleaning assembly, and a conveying assembly used for guiding the composite film to pass through a detection box body. The detection assembly comprises a heat source assembly and two groups of light source receiving assemblies and light source emitting assemblies which are respectively distributed at the front part and the rear part of the heat source assembly, the light source emitting assemblies emit strip-shaped light beams upwards, and the strip-shaped light beams penetrate through the composite film and are received by the light source receiving assemblies; according to the scheme, the transverse deviation of the film is inhibited in a high-temperature test through the directional deviation correction of the threaded telescopic sheet and the negative-pressure scrap recovery system, meanwhile, the scraping brush and the negative-pressure pump are linked to remove attachments on the surface of the carrier roller, the detection environment is prevented from being polluted by the softened and molten film, and the same film sample is supported to be continuously subjected to a contrast experiment at multi-gradient temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of battery module detection, and in particular to a high-temperature detection method and device for a composite film for a battery module. Background Art

[0002] In the battery module, the composite film between the batteries is a key component to ensure battery safety and performance. With the improvement of battery energy density and the development of fast charging technology, the performance requirements of composite films under extreme conditions such as high temperature and high pressure are becoming increasingly stringent. In particular, tensile tests and adhesion tests are usually performed to detect physical damage to composite films under high temperature environments. However, since the traditional high-temperature detection process is carried out in a closed environment, it is impossible to perform real-time detection of the condition of the composite film; especially in control experiments under different conditions of the same group of composite films, since the composite film is prone to chemical degradation during the high-temperature detection process, it may soften, shrink or even melt, thereby polluting the detection environment, making it difficult to proceed continuously. Summary of the invention

[0003] The object of the present invention is to provide a high temperature detection method and device for a composite film for a battery module, aiming to solve the problems in the prior art.

[0004] The present invention is implemented as follows: a high temperature detection device for a composite film for a battery module comprises a detection component, a cleaning component and a conveying component for guiding the composite film to pass through a detection box; The detection assembly includes a heat source assembly and two groups of light source receiving assemblies and light source emitting assemblies respectively distributed at the front and rear parts of the heat source assembly, wherein the light source emitting assembly emits a strip light beam upward, the strip light beam passes through the composite film, and is received by the light source receiving assembly; The detection assembly also includes two groups of rollers and pressure rollers. The rollers are placed below the composite film. Several threaded expansion pieces are evenly distributed on the surface of the rollers. The threaded expansion pieces at both ends are arranged in opposite directions. The threaded expansion pieces expand and contract along the vertical direction of the roller shaft. The threaded expansion pieces are in contact with the surface of the composite film. The pressure rollers are placed above the composite film and cooperate with the rollers to clamp the composite film. The cleaning assembly comprises a negative pressure collecting hopper and a scraping brush, wherein the scraping brush is arranged on the inner side of the top of the collecting hopper in an inclined upward direction and is used for scraping off solidified attachments on the surface of the roller.

[0005] Preferably, the conveying assembly includes a feed roller, a plurality of guide rollers and two tension rollers; The feeding roller is used for releasing the composite film, and a plurality of groups of the composite guide rollers are symmetrically distributed below the two sides of the detection component.

[0006] Preferably, two sets of first tensioning and telescopic machines are installed on one side of the detection box, and the rotating shafts at both ends of the feeding roller are connected to the telescopic parts of the two first tensioning and telescopic machines; The telescopic part of one group of the first tensioning and telescopic machines is also equipped with a guide motor, and the guide motor is used to drive the feeding roller to rotate.

[0007] Preferably, two sets of tensioning brackets are connected inside the detection box through bearings, the two tensioning rollers are respectively installed at the lower ends of the two tensioning brackets, and two sets of second tensioning and retracting machines are installed in the detection box; The telescopic parts of the two second tensioning and telescopic machines are respectively connected to the opposite sides of the two tensioning brackets, and a pressure sensor is also installed at the connection part between the telescopic parts of the second tensioning and telescopic machines and the tensioning bracket.

[0008] Preferably, the heat source assembly comprises an infrared heat lamp array and an infrared thermal imager, and the infrared heat lamp array is provided with short-wave quartz lamps, medium-wave carbon fiber lamps and long-wave ceramic lamps arranged at intervals.

[0009] Preferably, the detection box is located below the detection assembly and has trusses installed on both sides, a roller-pressing telescopic machine is installed between the two trusses, and the pressing rollers are connected through the telescopic parts of the roller-pressing telescopic machine; Two sets of guide rails are installed inside the truss, and the light source receiving assembly is slidably installed in the truss through the guide rails.

[0010] Preferably, the surface of the roller is evenly distributed with thread grooves, and a limiting slide plate arranged perpendicular to the axis of the roller is installed on the inner wall of the roller close to the thread groove, and a sliding rod is slidably provided inside the limiting slide plate, and the threaded expansion piece is connected via the sliding rod; The inner bearing of the roller is connected with an adjusting rod, the outer part of the adjusting rod is sleeved with a collar, the surface shaft of the collar is connected with an arc-shaped push-pull sheet, and the end of the push-pull sheet is connected with the sliding rod shaft.

[0011] Preferably, a lifting and telescopic machine and two parallel guide rods are installed on the outside of both sides of the detection box, and a guide block pushed by the telescopic part of the lifting and telescopic machine is slidably installed on the outside of the guide rod, and both ends of the roller are connected by the guide block rotating shaft; A driving motor and a switching telescopic machine are also installed on the guide block. The driving motor is connected to the shaft end belt transmission of the roller through a belt. The telescopic part of the switching telescopic machine is installed with a locking ring that passes through the inner side of the end of the roller. The surface of the locking ring is provided with locking teeth, and the end of the adjusting rod is provided with a tooth groove corresponding to the locking teeth.

[0012] Preferably, a negative pressure collecting box and a negative pressure pump are installed on one side of the detection box body, the suction end of the negative pressure pump is connected to the end of the collecting bucket through a pipeline, and the exhaust end of the negative pressure pump is connected to the negative pressure collecting box.

[0013] A high temperature detection method for a composite film for a battery module is applied to the above-mentioned high temperature detection device for a composite film for a battery module, comprising the following steps: Step 1: Assemble the composite film to be tested onto the conveying assembly, turn on the power supply in the test box, start the infrared heat lamp array in the heat source assembly to the set temperature, tension the composite film through the conveying assembly, and adjust the tensioning pressure, obtain the real-time feedback tension value from the pressure sensor, and calibrate the optical path through the light source transmitting assembly and the light source receiving assembly to ensure that the strip light beam passes vertically through the surface of the composite film; Step 2: Start the conveying assembly to deliver the first group of sections to be tested of the composite film into the testing box so that the first group of sections to be tested are placed under the testing assembly, and clamp the film by the pressure roller and the support roller to ensure that the first group of sections to be tested of the composite film are in flat contact with the heat source; Step 3: The infrared heat lamp array in the heat source component is heated up to the first set temperature according to the gradient, and the infrared thermal imager monitors the temperature distribution on the film surface in real time. During this process, the expansion and contraction amount of the threaded expansion sheet on the roller is controlled to dynamically compensate for the thermal expansion deformation of the film; Step 4: The light source emitting component emits a strip laser beam with a wavelength of 650nm upward, penetrating the surface and edge of the first group of sections to be tested of the composite film. The light source receiving component collects the transmitted / scattered light intensity signal, generates a grayscale image of the first group of sections to be tested of the composite film, calculates the thickness change of the first group of sections to be tested of the composite film through the light intensity attenuation rate, locates the area with abnormal shrinkage rate, and simultaneously identifies physical damages such as cracks and bulges through scattered light spot analysis; Step 5: After the first group of test sections of the film to be laminated is tested, the infrared heat lamp array in the heat source assembly is cooled to a set temperature, the roller is driven to sink and contact the scraping brush surface, and the roller is rotated at a high speed. During this process, the expansion and contraction amount of the threaded expansion piece on the roller is controlled so that the attachments between the gaps of the threaded expansion piece and on the surface of the threaded expansion piece can be scraped off, sucked away and collected; Step 6: Repeat the above step 2 to send the second group of sections to be tested of the composite film into the detection box, step 67 repeat the above step 3 and heat the infrared heat lamp array in the heat source component to the second set temperature according to the gradient, repeat the above step 4 to detect the second group of sections to be tested of the composite film, and generate a grayscale image of the second group of sections to be tested of the composite film; Step 7: While the second group of detection sections of the composite film are subjected to high temperature detection, the first group of detection sections of the composite film are naturally cooled. During the cooling process, the pressure sensor feeds back the tension value in real time to detect the heat shrinkage rate of the first group of detection sections of the composite film, and obtain the mechanical properties of the first detection section of the composite film at the first set temperature; Step 8: Repeat the second half of step 7 above, naturally cool the second group of test sections of the composite film, and test the heat shrinkage rate of the second group of test sections of the composite film to obtain the mechanical properties of the second test section of the composite film at the second set temperature, and complete the control experiment operation under different conditions for the same group of composite films.

[0014] The invention discloses a high temperature detection method and device for a composite film for a battery module, and the beneficial effects are: 1. This solution is based on infrared heat lamp array (short-wave quartz lamp, medium-wave carbon fiber lamp, long-wave ceramic lamp) and optical path collaborative analysis. It can monitor the thickness change, shrinkage rate and physical damage of the composite film in real time under high temperature environment, solving the limitation of traditional closed detection that cannot dynamically track film deformation.

[0015] 2. This solution uses the threaded expansion piece directional correction and negative pressure debris recovery system to suppress the lateral deviation of the film during high temperature testing. At the same time, the scraper and negative pressure pump are linked to remove the attachments on the roller surface to prevent the softened / molten film from contaminating the testing environment. It supports continuous control experiments on the same film sample at multiple gradient temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a high temperature detection device for a composite film for a battery module provided by an embodiment of the present invention; Figure 2 The invention provides a high temperature detection device for a composite film for a battery module. Figure 1 Schematic diagram of the AA section structure in the arrow direction; Figure 3 This is a schematic diagram from a second viewing angle of a high temperature detection device for a composite film for a battery module provided by an embodiment of the present invention; Figure 4 The invention provides a high temperature detection device for a composite film for a battery module. Figure 3 Schematic diagram of the BB section in the direction of the arrow; Figure 5 This is a schematic diagram of the internal structure of a detection component of a high temperature detection device for a composite film for a battery module provided by an embodiment of the present invention; Figure 6 It is a schematic diagram of the partial structure of a roller of a high temperature detection device for a composite film for a battery module provided by an embodiment of the present invention; Figure 7 A high temperature detection device for a composite film for a battery module provided by an embodiment of the present invention Figure 6 A schematic diagram of the local enlarged structure at C in FIG. Figure 8 It is a schematic diagram of the internal structure of a roller of a high-temperature detection device for a composite film for a battery module provided in an embodiment of the present invention.

[0017] Marking Description: 1. Detection box; 2. Conveying component; 3. Detection component; 4. Composite film; 5. Cleaning component; 21. First tensioning and telescopic machine; 22. Guide and feeding motor; 23. Tensioning bracket; 24. Second tensioning and telescopic machine; 25. Tensioning roller; 26. Feeding roller; 27. Multiple guide roller; 31. Heat source assembly; 32. Roller-type telescopic machine; 33. Pressing roller; 34. Support roller; 35. Lifting and telescopic machine; 36. Truss; 37. Light source receiving assembly; 38. Light source emitting assembly; 341, adjusting rod; 3411, tooth groove; 342, collar; 343, push-pull piece; 344, limit slide plate; 345, slide rod; 346, thread groove; 347, thread expansion piece; 351, guide rod; 352, guide block; 353, drive motor; 354, switching telescopic machine; 3541, locking ring; 3542, locking teeth; 51. Negative pressure collecting box; 52. Negative pressure pump; 53. Collecting bucket; 54. Scraping brush. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0020] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0021] In this embodiment: Reference Figure 1-3 As shown, a preferred embodiment of the present invention is provided.

[0022] The high temperature detection device for the composite film for the battery module of this embodiment includes a detection component 3, a cleaning component 5 and a conveying component 2 for guiding the composite film 4 to pass through the detection box 1; The detection component 3 includes a heat source component 31 and two groups of light source receiving components 37 and light source emitting components 38 respectively distributed at the front and rear parts of the heat source component 31. The light source emitting component 38 emits a strip light beam upward, which passes through the surface and edge of the composite film 4 and is received by the light source receiving component 37. The position and shrinkage rate of the composite film 4 are located in real time based on the change of light intensity. When the strip light beam passes through the composite film 4, the absorption, reflection and transmission of light by the surface of the composite film 4 will cause light intensity attenuation. By measuring the change of transmitted light intensity, the position of the composite film 4 during the transportation process can be located in real time. In addition, the physical damage of the composite film 4 is analyzed by light beam refraction / scattering. When there are defects such as cracks or bulges on the surface or inside the composite film 4, the light will be refracted or scattered, resulting in changes in the light spot shape (such as light intensity distribution and light spot size) at the receiving end. By analyzing the light spot characteristics, the defect type and position can be identified; when the bulge is large, a lens-like effect is formed, resulting in a significant increase in the brightness of the light spot center; when the crack is deep or wide, the light is partially blocked, resulting in a significant decrease in light intensity; and the defect type, position and size can be quickly and accurately identified based on the number or range of bright spots / light blockages.

[0023] The detection assembly 3 also includes two groups of rollers 34 and a pressure roller 33. The rollers 34 are placed below the composite film 4. Several threaded expansion pieces 347 are evenly distributed on the surface of the rollers 34. The threaded expansion pieces 347 at both ends are arranged in opposite directions. The threaded expansion pieces 347 expand and contract along the vertical direction of the roller axis. The threaded expansion pieces 347 are in contact with the surface of the composite film 4. The pressure roller 33 is placed above the composite film 4 and cooperates with the rollers 34 to clamp the composite film 4. The cleaning assembly 5 includes a negative pressure collecting hopper 53 and a scraping brush 54 . The scraping brush 54 is arranged on the inner side of the top of the collecting hopper 53 and is used to scrape off the solidified attachments on the surface of the roller 34 .

[0024] Among them, refer to the attached Figure 1 and attached Figure 4 As shown, the conveying assembly 2 includes a feed roller 26, a plurality of guide rollers 27 and two tensioning rollers 25, the feed roller 26 is used to release and guide the composite film 4, one side of the detection box 1 is installed with two groups of first tensioning and telescopic machines 21, the two end shafts of the feed roller 26 are connected to the telescopic parts of the two first tensioning and telescopic machines 21, and the telescopic part of one group of the first tensioning and telescopic machines 21 is also installed with a guide motor 22, and the guide motor 22 is used to drive the feed roller 26 to rotate to release the composite film 4 wound around the feed roller 26; Furthermore, a plurality of the plurality of guide rollers 27 are symmetrically distributed below the two sides of the detection assembly 3, and are used to guide the composite film 4 to be placed in the detection assembly 3. The plurality of guide rollers 27 can guide the composite film 4 to between the light source receiving assembly 37 and the light source emitting assembly 38, and can keep the composite film 4 in a horizontal state, so as to facilitate optical detection. It is worth noting that the two tensioning rollers 25 are used to guide the composite film 4 in the cooling process and detect the shrinkage rate of the composite film. The interior of the detection box 1 is connected with two groups of tensioning brackets 23 through bearings. The two tensioning rollers 25 are respectively installed at the lower ends of the two tensioning brackets 23. Two groups of second tensioning and retracting machines 24 are installed in the detection box 1. The telescopic parts of the two second tensioning and retracting machines 24 are respectively connected to the opposite sides of the two tensioning brackets 23, and a pressure sensor is also installed at the connection part between the telescopic part of the second tensioning and retracting machine 24 and the tensioning bracket 23. The composite film 4 is transported from the detection area (high temperature area) to the cooling area and is guided by the tensioning rollers 25 to ensure that the film is flat and wrinkle-free. At the same time, the film tension change is monitored in real time through the pressure sensor to indirectly calculate the shrinkage rate.

[0025] The heat source assembly 31 includes an infrared heat lamp array and an infrared thermal imager. The infrared heat lamp array is provided with short-wave quartz lamps, medium-wave carbon fiber lamps and long-wave ceramic lamps at intervals. The infrared heat lamp array heats up in a gradient (e.g., 50°C / min to 300°C). The infrared thermal imager monitors the surface temperature distribution of the film in real time. The medium-wave carbon fiber lamp is used for uniform heating over a large area, the short-wave quartz lamp focuses on local hot spots, and the long-wave ceramic lamp is used for deep thermal analysis of multi-layer composite structures. During the gradient heating, initial heating: the medium-wave carbon fiber lamp is started and the temperature is raised to 100°C at a rate of 50°C / min, and the infrared thermal imager monitors the overall temperature distribution of the film; local focusing: the short-wave quartz lamp focuses on the preset hot spot area (such as the edge of the composite film 4) for heating, and the temperature is raised to 150°C; in-depth analysis: the long-wave ceramic lamp is started and the temperature is raised to 200°C, and the infrared thermal imager captures the changes in the internal heat distribution of the composite film 4.

[0026] In the attached Figure 5 In the embodiment, the detection box 1 is located below the detection assembly 3 and is provided with trusses 36 on both sides, a roller-pressing telescopic machine 32 is provided between the two trusses 36, and the pressing roller 33 is connected through the telescopic part of the roller-pressing telescopic machine 32, and the roller-pressing telescopic machine 32 provides downward pressure for the pressing roller 33, and cooperates with the roller 34 to clamp the composite film 4; Two sets of guide rails are installed inside the truss 36 , and the light source receiving assembly 37 is slidably installed in the truss 36 via the guide rails, so as to facilitate the positioning of both side edges and the surface of the composite film 4 for optical inspection through the light source receiving assembly 37 .

[0027] See attached Figure 6-8As shown, the surface of the roller 34 is evenly distributed with thread grooves 346, and the inner wall of the roller 34 near the thread groove 346 is installed with a limiting slide plate 344 arranged perpendicular to its axis, and a sliding rod 345 is slidably provided inside the limiting slide plate 344, and the threaded expansion piece 347 is connected through the sliding rod 345, and the internal bearing of the roller 34 is connected with an adjusting rod 341, and the outer sleeve of the adjusting rod 341 is sleeved with a collar 342, and the surface rotation axis of the collar 342 is connected with an arc-shaped push-pull piece 343, and the end of the push-pull piece 343 is connected to the rotation axis of the sliding rod 345. When the roller 34 rotates relative to the adjusting rod 341, the adjusting rod 341 will push the sliding rod 345 to slide along the limiting slide plate 344 through the push-pull piece 343, and then push the threaded expansion piece 347 connected to the sliding rod 345 to move inside and outside the thread groove 346, so as to adjust the expansion amount of the threaded expansion piece 347 outside the roller 34. In the attached Figure 5 In the embodiment, both sides of the detection box 1 are externally installed with a lifting telescopic machine 35 and two parallel guide rods 351, and the guide rods 351 are externally slidably installed with a guide block 352 pushed by the telescopic part of the lifting telescopic machine 35, and both ends of the roller 34 are connected by the rotating shaft of the guide block 352, and the guide block 352 is also installed with a driving motor 353 and a switching telescopic machine 354, and the driving motor 353 is connected to the shaft end belt of the roller 34 through a belt, and the telescopic part of the switching telescopic machine 354 is installed with a belt that penetrates the inner side of the end of the roller 34. The locking ring 3541 has a locking tooth 3542 on its surface, and a tooth groove 3411 corresponding to the locking tooth 3542 is formed at the end of the adjusting rod 341; in the process of adjusting the roller 34 to switch between clamping or cleaning, the guide block 352 can be adjusted to slide on the guide rod 351 by using the lifting and telescopic machine 35, and at the same time, the guide block 352 synchronously drives the driving motor 353 and the switching and telescopic machine 354 to rise and fall, so that both of them can control the extension amount of the threaded expansion piece 347 when driving the threaded expansion piece 347 in the clamping state or the cleaning state.

[0028] In addition, a negative pressure collecting box 51 and a negative pressure pump 52 are installed on one side of the detection box body 1. The suction end of the negative pressure pump 52 is connected to the end of the collecting bucket 53 through a pipeline, and the exhaust end of the negative pressure pump 52 is connected to the negative pressure collecting box 51. When the negative pressure pump 52 is working, it can give the collecting bucket 53 a negative pressure force, and the attachments brushed off in the collecting bucket 53 are sucked into the negative pressure collecting box 51 and collected.

[0029] This solution is based on an infrared heat lamp array (short-wave quartz lamp, medium-wave carbon fiber lamp, long-wave ceramic lamp) and optical path collaborative analysis, and can monitor the thickness change, shrinkage rate and physical damage of the composite film 4 in real time under high temperature environment, solving the limitation of traditional closed detection that cannot dynamically track film deformation.

[0030] The threaded expansion piece 347 is used for directional correction and negative pressure debris recovery system to suppress lateral deviation of the composite film 4 during high temperature testing. At the same time, the scraper 54 and the negative pressure pump 52 are linked to remove the attachments on the surface of the roller 34 to prevent the softened / molten film from contaminating the testing environment, and to support continuous control experiments on the same film sample at multiple gradient temperatures.

[0031] Based on the above-mentioned embodiment, the above-mentioned first tensioning telescopic machine 21, the second tensioning telescopic machine 24, the lifting telescopic machine 35 and the switching telescopic machine 354 can adopt structures such as cylinders, oil cylinders, motors with lifting rods, etc., which are not limited in this embodiment.

[0032] The present embodiment also discloses a high-temperature detection method for a composite film for a battery module, which is applied to the high-temperature detection device for the composite film for the battery module, and comprises the following steps: Step 1: After the composite film 4 to be tested is inserted into the feeding roller 26 of the conveying assembly 2, the power in the detection box 1 is turned on, the infrared heat lamp array in the heat source assembly 31 is started to the set temperature, the composite film 4 is tensioned by the first tensioning and stretching machine 21 and the second tensioning and stretching machine 24, the pressure of the tensioning roller 25 is adjusted, the real-time feedback tension value of the pressure sensor is obtained, and the optical path is calibrated by the light source emitting assembly 38 and the light source receiving assembly 37 to ensure that the strip light beam passes vertically through the surface of the composite film 4; Step 2: Start the guide motor 22 to move the first group of composite film 4 to be tested. The test section is sent into the detection box 1 and passes by the multiple guide rollers 27 in turn so that the first group of sections to be tested are placed under the detection component 3, and the lifting and retracting machine 35 and the roller-pressing retracting machine 32 are started to push the pressing roller 33 and the supporting roller 34 to clamp the film to ensure that the first group of sections to be tested of the composite film 4 are in flat contact with the heat source; Step three: The infrared heat lamp array in the heat source component 31 is heated to the first set temperature according to the gradient, and the infrared thermal imager monitors the temperature distribution on the surface of the film in real time. During this process, the retractable part of the switching retractor 354 pushes the locking ring 3541 toward the supporting roller 34, so that the locking tooth 3542 is engaged with the tooth groove 3411 of the adjusting rod 341, and the rotation of the adjusting rod 341 is limited, and the switching retractor 354 drives the supporting roller 34 to rotate, so that the adjusting rod 341 can be used to Use the push-pull sheet 343 to push the slide bar 345 to control the expansion and contraction of the threaded expansion sheet 347, and dynamically compensate for the thermal expansion deformation of the film; Step 4: The light source emitting component 38 emits a strip laser beam with a wavelength of 650nm upward, penetrating the surface and edge of the first group of sections to be tested of the composite film 4, and the light source receiving component 37 collects the transmission / scattered light intensity signal to generate a grayscale image of the first group of sections to be tested of the composite film 4, and calculates the thickness change of the first group of sections to be tested of the composite film 4 through the light intensity attenuation rate, locates the area with abnormal shrinkage rate, and at the same time, the scattered light spot analysis identifies physical damage such as cracks and bulges; Step 5: After the first group of test sections of the composite film 4 are tested, the infrared heat lamp array in the heat source component 31 is cooled to the set temperature, and the lifting and retracting machine is used to 35 drives the roller 34 to sink and contact the surface of the scraper 54, starts the negative pressure pump 52, and starts the driving motor 353 to drive the roller 34 to rotate at a high speed. In this process, the switch telescopic machine 354 continues to control the telescopic amount of the threaded telescopic sheet 347, so that the attachments between the gaps of the threaded telescopic sheet 347 and on the surface of the threaded telescopic sheet 347 can be scraped off, sucked away and collected; Step 6: Repeat the above step 2 to send the second group of sections to be tested of the composite film 4 into the detection box 1, step 67 repeats the above step 3 and heats the infrared heat lamp array in the heat source component 31 to the second set temperature according to the gradient, repeats the above step 4 to detect the second group of sections to be tested of the composite film 4, and generates a grayscale image of the second group of sections to be tested of the composite film 4;Step 7: While the second group of detection sections of the composite film 4 is being tested at high temperature, the first group of detection sections of the composite film 4 is sent to the tension roller 25 for natural cooling. During the cooling process, the pressure sensor feeds back the tension value in real time to detect the heat shrinkage rate of the first group of detection sections of the composite film 4, and obtain the mechanical properties of the first detection section of the composite film 4 at the first set temperature; Step 8: Repeat the second half of the above step 7, cool the second group of detection sections of the composite film 4 naturally, and detect the heat shrinkage rate of the second group of detection sections of the composite film 4, and obtain the mechanical properties of the second detection section of the composite film 4 at the second set temperature, completing the control experiment operation of the same group of composite films 4 under different conditions. ;

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature detection device for a composite film for a battery module, characterized in that: It includes a detection component, a cleaning component and a conveying component for guiding the composite film to pass through the detection box; The detection assembly includes a heat source assembly and two groups of light source receiving assemblies and light source emitting assemblies respectively distributed at the front and rear parts of the heat source assembly, wherein the light source emitting assembly emits a strip light beam upward, the strip light beam passes through the composite film, and is received by the light source receiving assembly; The detection assembly also includes two groups of rollers and pressure rollers. The rollers are placed below the composite film. Several threaded expansion pieces are evenly distributed on the surface of the rollers. The threaded expansion pieces at both ends are arranged in opposite directions. The threaded expansion pieces expand and contract along the vertical direction of the roller shaft. The threaded expansion pieces are in contact with the surface of the composite film. The pressure rollers are placed above the composite film and cooperate with the rollers to clamp the composite film. The cleaning assembly comprises a negative pressure collecting hopper and a scraping brush, wherein the scraping brush is arranged on the inner side of the top of the collecting hopper in an inclined upward direction and is used for scraping off solidified attachments on the surface of the roller.

2. A high temperature detection device for a composite film for a battery module according to claim 1, characterized in that: The conveying assembly includes a feed roller, a plurality of guide rollers and two tension rollers; The feeding roller is used for releasing the composite film, and a plurality of groups of the composite guide rollers are symmetrically distributed below the two sides of the detection component.

3. A high temperature detection device for a composite film for a battery module as claimed in claim 2, characterized in that: Two sets of first tensioning and telescopic machines are installed on one side of the detection box, and the rotating shafts at both ends of the feeding roller are connected to the telescopic parts of the two first tensioning and telescopic machines; The telescopic part of one group of the first tensioning and telescopic machines is also equipped with a guide motor, and the guide motor is used to drive the feeding roller to rotate.

4. A high temperature detection device for a composite film for a battery module as claimed in claim 2, characterized in that: The inside of the detection box is connected with two sets of tensioning brackets through bearings, the two tensioning rollers are respectively installed at the lower ends of the two tensioning brackets, and two sets of second tensioning and retracting machines are installed in the detection box; The telescopic parts of the two second tensioning and telescopic machines are respectively connected to the opposite sides of the two tensioning brackets, and a pressure sensor is also installed at the connection part between the telescopic parts of the second tensioning and telescopic machines and the tensioning bracket.

5. A high temperature detection device for a composite film for a battery module as claimed in claim 1, characterized in that: The heat source assembly comprises an infrared heat lamp array and an infrared thermal imager. The infrared heat lamp array is provided with short-wave quartz lamps, medium-wave carbon fiber lamps and long-wave ceramic lamps distributed at intervals.

6. A high temperature detection device for a composite film for a battery module as claimed in claim 1, characterized in that: The detection box is located below the detection assembly and is equipped with trusses on both sides, a roller-pressing telescopic machine is installed between the two trusses, and the pressure rollers are connected through the telescopic parts of the roller-pressing telescopic machine; Two sets of guide rails are installed inside the truss, and the light source receiving assembly is slidably installed in the truss through the guide rails.

7. A high temperature detection device for a composite film for a battery module according to claim 1, characterized in that: The surface of the roller is evenly distributed with thread grooves, and a limiting slide plate arranged perpendicular to the axis of the roller is installed on the inner wall of the roller near the thread groove, and a sliding rod is slidably arranged inside the limiting slide plate, and the threaded expansion piece is connected through the sliding rod; The inner bearing of the roller is connected with an adjusting rod, the outer part of the adjusting rod is sleeved with a collar, the surface shaft of the collar is connected with an arc-shaped push-pull sheet, and the end of the push-pull sheet is connected with the sliding rod shaft.

8. A high temperature detection device for a composite film for a battery module as claimed in claim 7, characterized in that: A lifting and telescopic machine and two parallel guide rods are installed on the outside of both sides of the detection box, and a guide block pushed by the telescopic part of the lifting and telescopic machine is slidably installed on the outside of the guide rod, and both ends of the roller are connected by the guide block rotating shaft; A driving motor and a switching telescopic machine are also installed on the guide block. The driving motor is connected to the shaft end belt transmission of the roller through a belt. The telescopic part of the switching telescopic machine is installed with a locking ring that passes through the inner side of the end of the roller. The surface of the locking ring is provided with locking teeth, and the end of the adjusting rod is provided with a tooth groove corresponding to the locking teeth.

9. A high temperature detection device for a composite film for a battery module as claimed in claim 1, characterized in that: A negative pressure collecting box and a negative pressure pump are installed on one side of the detection box body. The suction end of the negative pressure pump is connected to the end of the collecting bucket through a pipeline, and the exhaust end of the negative pressure pump is connected to the negative pressure collecting box.

10. A high temperature detection method for a composite film for a battery module, characterized in that: A high temperature detection device for a composite film for a battery module as claimed in any one of claims 1 to 9 comprises the following steps: Step 1: Assemble the composite film to be tested onto the conveying assembly, turn on the power supply in the test box, start the infrared heat lamp array in the heat source assembly to the set temperature, tension the composite film through the conveying assembly, and adjust the tensioning pressure, obtain the real-time feedback tension value from the pressure sensor, and calibrate the optical path through the light source transmitting assembly and the light source receiving assembly to ensure that the strip light beam passes vertically through the surface of the composite film; Step 2: Start the conveying assembly to deliver the first group of sections to be tested of the composite film into the testing box so that the first group of sections to be tested are placed under the testing assembly, and clamp the film by the pressure roller and the support roller to ensure that the first group of sections to be tested of the composite film are in flat contact with the heat source; Step 3: The infrared heat lamp array in the heat source component is heated up to the first set temperature according to the gradient, and the infrared thermal imager monitors the temperature distribution on the film surface in real time. During this process, the expansion and contraction amount of the threaded expansion sheet on the roller is controlled to dynamically compensate for the thermal expansion deformation of the film; Step 4: The light source emitting component emits a strip laser beam with a wavelength of 650nm upward, penetrating the surface and edge of the first group of sections to be tested of the composite film. The light source receiving component collects the transmitted / scattered light intensity signal, generates a grayscale image of the first group of sections to be tested of the composite film, calculates the thickness change of the first group of sections to be tested of the composite film through the light intensity attenuation rate, locates the area with abnormal shrinkage rate, and simultaneously identifies physical damages such as cracks and bulges through scattered light spot analysis; Step 5: After the first group of test sections of the film to be laminated is tested, the infrared heat lamp array in the heat source assembly is cooled to a set temperature, the roller is driven to sink and contact the scraping brush surface, and the roller is rotated at a high speed. During this process, the expansion and contraction amount of the threaded expansion piece on the roller is controlled so that the attachments between the gaps of the threaded expansion piece and on the surface of the threaded expansion piece can be scraped off, sucked away and collected; Step 6: Repeat the above step 2 to send the second group of sections to be tested of the composite film into the detection box, step 67 repeat the above step 3 and heat the infrared heat lamp array in the heat source component to the second set temperature according to the gradient, repeat the above step 4 to detect the second group of sections to be tested of the composite film, and generate a grayscale image of the second group of sections to be tested of the composite film; Step 7: While the second group of detection sections of the composite film are subjected to high temperature detection, the first group of detection sections of the composite film are naturally cooled. During the cooling process, the pressure sensor feeds back the tension value in real time to detect the heat shrinkage rate of the first group of detection sections of the composite film, and obtain the mechanical properties of the first detection section of the composite film at the first set temperature; Step 8: Repeat the second half of step 7 above, naturally cool the second group of test sections of the composite film, and test the heat shrinkage rate of the second group of test sections of the composite film to obtain the mechanical properties of the second test section of the composite film at the second set temperature, and complete the control experiment operation under different conditions for the same group of composite films.

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