High-temperature Detection Method and Device for Composite Film for Battery Module

Abstract

The present 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, comprising a detection component, a cleaning component and a conveying component for guiding the composite film to pass through a detection box; the detection component comprises a heat source component and two groups of light source receiving components and a light source emitting component respectively distributed at the front and rear parts of the heat source component, the light source emitting component emits a strip light beam upward, the strip light beam passes through the composite film and is received by the light source receiving component; the present invention suppresses the lateral deviation of the film during high-temperature testing through a directional deviation correction of a threaded expansion piece and a negative pressure debris recovery system, and at the same time a scraping brush and a negative pressure pump are linked to remove attachments on the surface of a roller, thereby avoiding contamination of the detection environment by the softened molten film, and supporting continuous control experiments on the same film sample at multiple gradient temperatures.

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 used in a battery module. Background Art

[0002] In a battery module, the composite film between batteries is a key component to ensure the safety and performance of the battery. With the improvement of battery energy density and the development of fast charging technology, the performance requirements of the composite film under extreme working conditions such as high temperature and high pressure are becoming increasingly stringent. Especially when detecting physical damage of the composite film in a high-temperature environment, tensile tests and adhesion tests are usually carried out;

[0003] However, since the traditional high-temperature detection process is carried out in a closed environment, it is impossible to detect the situation of the composite film in real time; especially when conducting a control experiment on the same group of composite films under different conditions, since the composite film is prone to chemical degradation during the high-temperature detection process, softening, shrinking or even melting occurs, polluting the detection environment, making it difficult to carry out continuously. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-temperature detection method and device for a composite film used in a battery module, aiming to solve the problems in the prior art.

[0005] The present invention is implemented as follows. A high-temperature detection device for a composite film used in a battery module includes a detection component, a cleaning component, and a conveying component for guiding the composite film through a detection box;

[0006] The detection component includes a heat source component, and a light source receiving component and a light source emitting component respectively distributed at the front and rear parts of the heat source component. The light source emitting component emits a strip-shaped light beam upward, and the strip-shaped light beam passes through the composite film and is received by the light source receiving component;

[0007] The detection component further includes two groups of idler rollers and a pressure roller. The idler rollers are placed below the composite film, and a number of threaded telescopic sheets are evenly distributed on the surface of the idler rollers, and the threaded telescopic sheets at both ends are arranged in the opposite direction. The threaded telescopic sheets expand and contract in the vertical direction of the roller shaft, and the threaded telescopic sheets contact the surface of the composite film. The pressure roller is placed above the composite film and cooperates with the idler rollers to clamp the composite film;

[0008] The cleaning component includes a collecting hopper with a negative pressure and a brush. The brush is obliquely upward arranged inside the top of the collecting hopper for scraping off the solidified attachments on the surface of the idler rollers.

[0009] Preferably, the conveying component includes a feeding roller, a number of guiding rollers, and two tension rollers;

[0010] The feeding roller is used to release the composite film, and several of the multiple guiding rollers are symmetrically distributed in groups on both sides below the detection component.

[0011] Preferably, two first tensioning telescopic machines are installed on one side of the detection box body, and the rotating shafts at both ends of the feeding roller are connected to the telescopic parts of the two first tensioning telescopic machines;

[0012] The telescopic part of one of the first tensioning telescopic machines is further installed with a guiding motor, and the guiding motor is used to drive the feeding roller to rotate.

[0013] Preferably, two tensioning brackets are connected inside the detection box body through bearings, and the two tensioning rollers are respectively installed at the lower ends of the two tensioning brackets. Two second tensioning telescopic machines are installed inside the detection box body;

[0014] The telescopic parts of the two second tensioning telescopic machines are respectively connected to the opposite sides of the two tensioning brackets, and a pressure sensor is further installed at the connection part between the telescopic part of the second tensioning telescopic machine and the tensioning bracket.

[0015] Preferably, the heat source component includes an infrared thermal lamp array and an infrared thermal imager, and the infrared thermal lamp array is provided with short-wave quartz lamps, medium-wave carbon fiber lamps and long-wave ceramic lamps distributed at intervals.

[0016] Preferably, trusses are installed on both sides below the detection box body where the detection component is located, a roller pressing telescopic machine is installed between the two trusses, and the pressing roller is connected through the telescopic part of the roller pressing telescopic machine;

[0017] Two guide rails are installed inside the truss, and the light source receiving component is slidably installed inside the truss through the guide rails.

[0018] Preferably, thread grooves are evenly distributed on the surface of the supporting roller. A limiting sliding plate perpendicular to the axis of the supporting roller is installed on the inner wall of the supporting roller near the thread groove. A sliding rod slides inside the limiting sliding plate, and the thread expansion piece is connected through the sliding rod;

[0019] An adjusting rod is connected inside the supporting roller through a bearing. A collar is sleeved outside the adjusting rod. An arc-shaped pushing and pulling piece is rotationally connected to the surface of the collar, and the end of the pushing and pulling piece is rotationally connected to the sliding rod.

[0020] Preferably, lifting telescopic machines and two parallel guide rods are installed on both outer sides of the detection box body. A guide block pushed by the telescopic part of the lifting telescopic machine is slidably installed outside the guide rod, and both ends of the supporting roller are rotationally connected through the guide block;

[0021] 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.

[0022] 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.

[0023] 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:

[0024] 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;

[0025] 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;

[0026] 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;

[0027] 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;

[0028] 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;

[0029] 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;

[0030] 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;

[0031] 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.

[0032] The invention discloses a high temperature detection method and device for a composite film for a battery module, and the beneficial effects are:

[0033] 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.

[0034] 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

[0035] 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;

[0036] 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;

[0037] 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;

[0038] Figure 4 The invention provides a high temperature detection device for a composite film for a battery module.Figure 3 Schematic diagram of cross-section B-B in the direction of the arrow

[0039] Figure 5 Internal view structure schematic diagram of the detection component of a high-temperature detection device for a composite film used in a battery module provided by an embodiment of the present invention

[0040] Figure 6 Partial structure schematic diagram of the idler roller of a high-temperature detection device for a composite film used in a battery module provided by an embodiment of the present invention

[0041] Figure 7 A high-temperature detection device for a composite film used in a battery module provided by an embodiment of the present invention Figure 6 Partial enlarged structure schematic diagram at position C in

[0042] Figure 8 Internal structure schematic diagram of the idler roller of a high-temperature detection device for a composite film used in a battery module provided by an embodiment of the present invention

[0043] Marking description:

[0044] 1. Detection box body; 2. Conveyor component; 3. Detection component; 4. Composite film; 5. Cleaning component

[0045] 21. First tensioning telescopic machine; 22. Guide motor; 23. Tensioning bracket; 24. Second tensioning telescopic machine; 25. Tensioning roller; 26. Feeding roller; 27. Re-guiding roller

[0046] 31. Heat source component; 32. Roller pressing telescopic machine; 33. Pressing roller; 34. Idler roller; 35. Lifting telescopic machine; 36. Truss; 37. Light source receiving component; 38. Light source emitting component

[0047] 341. Adjusting rod; 3411. Tooth groove; 342. Collar; 343. Pushing and pulling piece; 344. Limit sliding plate; 345. Slide bar; 346. Thread groove; 347. Threaded telescopic piece

[0048] 351. Guide rod; 352. Guide block; 353. Driving motor; 354. Switching telescopic machine; 3541. Locking ring; 3542. Locking tooth

[0049] 51. Negative pressure dust collection box; 52. Negative pressure pump; 53. Collection hopper; 54. Scraper brush Detailed implementation manners

[0050] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to 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 used to limit the present invention.

[0051] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. This 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 orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and cannot be construed as a limitation of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0052] The implementation of the present invention will be described in detail below in conjunction with specific embodiments.

[0053] In this embodiment:

[0054] Refer to Figures 1-3 As shown, a preferred embodiment is provided by the present invention.

[0055] The high-temperature detection device for the composite film of the battery module in this embodiment includes a detection component 3, a cleaning component 5, and a conveying component 2 for guiding the composite film 4 through the detection box 1;

[0056] 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 of the heat source component 31. The light source emitting component 38 emits a strip-shaped light beam upward. The strip-shaped light beam passes through the surface and edge of the composite film 4 and is received by the light source receiving component 37. Based on the change in light intensity, the position and shrinkage rate of the composite film 4 are located in real time. When the strip-shaped 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 the light intensity to attenuate. By measuring the change in transmitted light intensity, the position of the composite film 4 during transportation can be located in real time;

[0057] Moreover, the physical damage of the composite film 4 is analyzed through beam refraction / scattering. When there are defects such as cracks and bulges on the surface or inside of the composite film 4, the light will refract or scatter, resulting in changes in the spot shape (such as light intensity distribution and spot size) at the receiving end. By analyzing the spot characteristics, the type and position of the defects can be identified; when the bulge is large, a lens effect is formed, resulting in a significant increase in the brightness of the spot center. When the crack is deep or wide, the light is partially blocked, resulting in a significant decrease in light intensity. And according to the number or range of bright spots / light blockages, the type, position, and size of the defects can be quickly and accurately identified.

[0058] 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.

[0059] 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 .

[0060] 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;

[0061] 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.

[0062] 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.

[0063] Among them, the heat source component 31 includes an infrared thermal lamp array and an infrared thermal imager. The infrared thermal lamp array is provided with short-wave quartz lamps, medium-wave carbon fiber lamps, and long-wave ceramic lamps distributed at intervals. The infrared thermal lamp array heats up in a gradient manner (such as rising from 50 °C / min to 300 °C). The infrared thermal imager monitors the temperature distribution on the surface of the film in real time. The medium-wave carbon fiber lamps are used for large-area uniform heating, the short-wave quartz lamps focus on local hot spots, and the long-wave ceramic lamps are for in-depth thermal analysis of multi-layer composite structures;

[0064] When performing gradient heating, initial heating: the medium-wave carbon fiber lamps are started and heated 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 lamps focus on heating a preset hot spot area (such as the edge of the composite film 4) and heat up to 150 °C; in-depth analysis: the long-wave ceramic lamps are started and heated to 200 °C, and the infrared thermal imager captures the change in the internal heat distribution of the composite film 4.

[0065] In the appendix Figure 5 In the figure, trusses 36 are installed on both sides below the detection box body 1 of the detection component 3. A roller pressing telescopic machine 32 is installed between the two trusses 36. The pressing roller 33 is connected through the telescopic part of the roller pressing telescopic machine 32. The roller pressing telescopic machine 32 provides a downward pressure for the pressing roller 33 to clamp the composite film 4 in cooperation with the supporting roller 34;

[0066] Two groups of guide rails are installed inside the truss 36. The light source receiving component 37 is slidably installed in the truss 36 through the guide rails, which is convenient for positioning the two side edges and the surface of the composite film 4 through the light source receiving component 37 for optical detection.

[0067] Referring to the appendix Figures 6-8 As shown, thread grooves 346 are evenly distributed on the surface of the supporting roller 34. A limiting sliding plate 344 perpendicular to the axis of the supporting roller 34 is installed on the inner wall of the supporting roller 34 close to the thread grooves 346. A sliding rod 345 slides inside the limiting sliding plate 344. The threaded telescopic piece 347 is connected through the sliding rod 345. A regulating rod 341 is connected to the supporting roller 34 through a bearing. A collar 342 is sleeved on the outside of the regulating rod 341. An arc-shaped pushing and pulling piece 343 is rotatably connected to the surface of the collar 342. The end of the pushing and pulling piece 343 is rotatably connected to the sliding rod 345. When the supporting roller 34 rotates relative to the regulating rod 341, the regulating rod 341 will push the sliding rod 345 to slide along the limiting sliding plate 344 through the pushing and pulling piece 343, and further push the threaded telescopic piece 347 connected to the sliding rod 345 to move inside and outside the thread grooves 346 to adjust the telescopic amount of the threaded telescopic piece 347 outside the supporting roller 34;

[0068] In the appendix Figure 5Among them, lifting telescopic machines 35 and two parallel guide rods 351 are installed on the outer sides of both sides of the detection box body 1. A guide block 352 pushed by the telescopic part of the lifting telescopic machine 35 is slidably installed on the outer part of the guide rod 351. Both ends of the roller 34 are rotationally connected through the guide block 352. A driving motor 353 and a switching telescopic machine 354 are also installed on the guide block 352. The driving motor 353 is belt-drivenly connected to the shaft end of the roller 34 through a belt. The telescopic part of the switching telescopic machine 354 is installed with a locking ring 3541 penetrating through the inner side of the end of the roller 34. Lock teeth 3542 are arranged on the surface of the locking ring 3541. A tooth groove 3411 corresponding to the lock teeth 3542 is opened at the end of the adjusting rod 341; during the process of adjusting the roller 34 to switch between clamping and cleaning, it can be realized by using the lifting telescopic machine 35 to adjust the sliding of the guide block 352 on the guide rod 351. At the same time, the guide block 352 synchronously drives the driving motor 353 and the switching telescopic machine 354 to lift, so that when the threaded telescopic piece 347 is in the clamping state or the cleaning state, the control of the telescopic amount of the threaded telescopic piece 347 can be realized.

[0069] Moreover, a negative pressure dust collection box 51 and a negative pressure pump 52 are installed on one side of the detection box body 1. The air extraction end of the negative pressure pump 52 is connected to the end of the collection hopper 53 through a pipeline, and the exhaust end of the negative pressure pump 52 is connected to the negative pressure dust collection box 51. Under the operation of the negative pressure pump 52, it can give the collection hopper 53 a negative pressure force to suck the attached substances brushed off in the collection hopper 53 into the negative pressure dust collection box 51 for collection.

[0070] This solution is based on the collaborative analysis of an infrared thermal lamp array (short-wave quartz lamp, medium-wave carbon fiber lamp, long-wave ceramic lamp) and the optical path, 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 the traditional closed detection that cannot dynamically track the film deformation.

[0071] Through the directional deviation correction of the threaded telescopic piece 347 and the negative pressure debris recovery system, the lateral deviation of the composite film 4 is suppressed during high-temperature testing. At the same time, the brush 54 and the negative pressure pump 52 are linked to remove the attached substances on the surface of the roller 34, avoiding the pollution of the detection environment by the softened / melted film, and supporting continuous comparative experiments on the same film sample at multiple gradient temperatures.

[0072] On the basis of the above-mentioned embodiment, the first tensioning telescopic machine 21, the second tensioning telescopic machine 24, the lifting telescopic machine 35 and the switching telescopic machine 354 can be selected from structures such as cylinders, oil cylinders, motors with lifting rods, etc., which are not limited in this embodiment.

[0073] 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 Seven: While the second detection section of the composite film 4 is undergoing high-temperature detection, the first detection section of the composite film 4 is sent to the tension roller 25 for natural cooling. During the cooling process, the pressure sensor real-time feeds back the tension value to detect the heat shrinkage rate of the first detection section 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 Eight: Repeat the latter half of Step Seven above, naturally cool the second detection section of the composite film 4, and detect the heat shrinkage rate of the second detection section of the composite film 4 to obtain the mechanical properties of the second detection section of the composite film 4 at the second set temperature, and complete the control experiment operation of the same group of composite films 4 under different conditions.;

[0074] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-temperature detection device for a composite film used in 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 includes 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 at an angle upward, and is used to scrape off solidified attachments on the surface of the roller; 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 rotation 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 rotation shaft; 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.

2. The high-temperature detection device for the composite film used in the 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. The high-temperature detection device for the composite film used in the battery module according to claim 2, wherein, 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. The high-temperature detection device for the composite film used in the battery module according to claim 2, wherein, 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. The high-temperature detection device for a composite film used in a battery module according to claim 4, wherein, 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. The high-temperature detection device for the composite film used in the battery module according to 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. The high-temperature detection device for the composite film used in the battery module according to claim 1, wherein, 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.

8. A high-temperature detection method for a composite film used in a battery module, characterized in that, A high temperature detection device for a composite film for a battery module as claimed in claim 5 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 detection sections of the composite film into the detection box so that the first group of detection sections are placed below the detection assembly, and clamp the film through the pressure roller and the support roller to ensure that the first group of detection sections of the composite film are flat and in 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 detection segment of the composite film. The light source receiving component collects the transmitted / scattered light intensity signal, generates a grayscale image of the first detection segment of the composite film, calculates the thickness change of the first detection segment 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 detection segments of the composite film into the detection box, 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 detection segments of the composite film, and generate a grayscale image of the second group of detection segments 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 group of detection sections of the composite film at the first set temperature; Step Eight: Repeat the latter half of Step Seven above, naturally cool the second group of detection segments of the composite film, and detect the heat shrinkage rate of the second group of detection segments of the composite film to obtain the mechanical properties of the second group of detection segments of the composite film at the second set temperature, thus completing the control experiment operation of the same group of composite films under different conditions.

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