Diaphragm defect detection system and method thereof

Abstract

The invention relates to the technical field of lithium battery diaphragm detection, in particular to a diaphragm defect detection system and method, and the system comprises a positioning and conveying mechanism, a defect detection mechanism and a metal foreign matter detection mechanism; after the defect detection mechanism detects the surface defect of the diaphragm, the metal foreign matter detection mechanism rechecks the diaphragm, detects the foreign matter on the diaphragm, judges whether the foreign matter belongs to a metal foreign matter or a non-metal foreign matter, and secondarily confirms the foreign matter defect, so that whether the surface affects the electrical performance or not can be judged more accurately. According to the diaphragm defect detection method, the initial positions of the three detection mechanisms are corrected to generate the current weakness information at different diaphragm lengths and the diaphragm defects of the current weakness information at the corresponding positions. And the current weakness information of the defect at the specific length part of the diaphragm can be intuitively seen, so that whether the defect affects the electrical performance of the diaphragm or not can be judged.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery diaphragm detection, and more specifically, to a diaphragm defect detection system and method thereof. Background Art

[0002] Lithium battery separator is one of the key internal components of the battery. Its main function is to separate the positive and negative electrodes of the battery to prevent the two electrodes from contacting and short-circuiting. In addition, it also has the function of allowing electrolyte ions to pass through. Its performance determines the interface structure and internal resistance of the battery, directly affecting the battery's capacity, cycle and safety performance. Generally, high-strength thin-film polyolefin porous materials are used. In order to improve the performance of polyolefin separators and meet the technical requirements of the new generation of lithium batteries, such as safety, long life, and battery structure diversity, ceramic coated separators and polymer coated separators were born.

[0003] However, during the production and transportation of the diaphragm, it is inevitable that there will be defects such as pinholes, scratches, wrinkles, bright spots, foreign matter, and coating leakage. Some of these defects will affect the electrical performance of the diaphragm, while some are just appearance defects. In the actual battery application stage, defects that affect the electrical performance of the diaphragm often lead to micro-short circuits and Hi-pot defects in the battery cell, which may cause fire and explosion in the battery cell. Therefore, before the production of the battery cell, it is particularly important to strengthen the detection and abnormal analysis of the electrical performance defects of the diaphragm to prevent the defective diaphragms of the same batch from flowing to the next process.

[0004] At present, the types of defect detection for diaphragms are generally divided into defects such as pinholes, transparency, coating leakage, black spots, dark spots, stripes, scratches, and foreign matter. Among the foreign matter, there are metallic foreign matter and non-metallic foreign matter, but defect detection cannot distinguish between metallic foreign matter and non-metallic foreign matter, and non-metallic foreign matter will not affect the electrical performance. Therefore, when the defect of foreign matter occurs, it is impossible to determine whether the defect affects the electrical performance. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiency in the prior art that the type of foreign matter defects in the diaphragm surface defects cannot be known, and to provide a diaphragm defect detection system that can determine whether the foreign matter is a metal foreign matter or a non-metal foreign matter. A diaphragm defect detection method is also provided, which can associate and match diaphragm defects with electrical weak points, so as to clearly know the diaphragm defects that affect the electrical performance of the diaphragm.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A diaphragm defect detection system is provided, comprising:

[0008] A defect detection mechanism, used for performing defect detection on the diaphragm;

[0009] A metal foreign body detection mechanism, used to detect metal foreign bodies on the diaphragm;

[0010] A positioning and conveying mechanism, used for positioning and conveying the diaphragm, the diaphragm passes through the defect detection mechanism and the metal foreign body detection mechanism in sequence through the positioning and conveying mechanism;

[0011] The diaphragm defect detection system of the present invention has a positioning and conveying mechanism arranged so that the diaphragm can be tensioned and sequentially pass through the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism. When passing through the defect detection mechanism, pinholes, transparency, coating leakage, black spots, dark spots, stripes, scratches, foreign bodies and other defects on the diaphragm can be identified. The metal foreign body detection mechanism can identify defects such as metal foreign bodies and non-metal foreign bodies, so that it can be further determined whether the foreign body defects detected by the defect detection mechanism are caused by metal foreign bodies or non-metal foreign bodies.

[0012] Furthermore, the metal foreign body detection mechanism includes a first acquisition camera and a first light source located on one side of the diaphragm, and a second light source located on the other side of the diaphragm; the light source port of the second light source faces the acquisition port of the first acquisition camera, and the light of the first light source and the light of the second light source intersect on the diaphragm. The first light source irradiates the diaphragm, and the diaphragm reflects to the first acquisition camera, and the second light source forms a reflection at the diaphragm. Since the first light source and the second light source intersect at the diaphragm, the information collected by the first acquisition camera comes from the same diaphragm position. Regardless of whether the metal is irradiated with light in the visible light or invisible light band, the reflection characteristics are consistent. However, non-metals will show the original reflection characteristics, and the metal foreign bodies (conductors) and non-metal foreign bodies (insulators) can be distinguished by the different characteristics of metals and non-metals. At the same time, the metal foreign body detection mechanism can also distinguish pinholes and transparent or thin spots according to the difference in the transmitted wavelength, and can perform secondary confirmation of the pinholes or transparent detected by the defect meter. Because metal and pinholes are two important defects that affect the electrical properties of the diaphragm, non-metallic foreign matter and transparency often do not affect the electrical properties of the diaphragm, that is, they are not factors that cause the diaphragm to short-circuit. The detection of the defect detection mechanism is reconfirmed to avoid affecting the judgment of the results.

[0013] The defect detection mechanism includes a second acquisition camera and a third light source respectively located on both sides of the diaphragm, and the light source port of the third light source faces the acquisition port of the second acquisition camera; the third light source emits light to the second acquisition camera, forming a transmission effect on the diaphragm. At this time, the second acquisition camera determines whether there are surface defects on the diaphragm by acquiring images or brightness and other information.

[0014] Furthermore, a shading plate is provided between the defect detection mechanism and the metal foreign body detection mechanism, and the shading plate is used to prevent the light of the first light source and the second light source from affecting the second acquisition camera.

[0015] Furthermore, it also includes:

[0016] An electrical weakness detection mechanism, used to collect electrical weakness information of the diaphragm;

[0017] A meter to calculate the length of the diaphragm;

[0018] The diaphragm passes through the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism in sequence through the positioning and conveying mechanism;

[0019] The controller includes a data acquisition module for collecting detection data of the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism and data of the meter, a data processing module for summarizing and arranging the detection data, and a report output module.

[0020] The arrangement of the positioning and conveying mechanism of the diaphragm defect detection system of the present invention enables the diaphragm to be tensioned and pass through the defect detection mechanism, the metal foreign matter detection mechanism and the electrical weak point detection mechanism in sequence. When passing through the defect detection mechanism, pinholes, transparency, coating leakage, black spots, dark spots, stripes, scratches, foreign matter and other defects on the diaphragm can be identified. The metal foreign matter detection mechanism can identify defects such as pinholes, metal foreign matter, and non-metallic foreign matter, and the electrical weak point detection mechanism can collect electrical weak point information and identify defects such as pinholes, scratches and accumulation of conductive particles on the diaphragm. The meter can calculate the length of the diaphragm. After the data identified by the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism are collected by the data acquisition module, they will be associated with the current length of the meter when the corresponding data is collected. Since the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism are located at different positions on the rack, there will be deviations in the length data corresponding to the data detected by the three mechanisms. The data processing module corrects the initial positions of the three mechanisms. After the correction is completed, the data detected by the three mechanisms can correspond to the same length of the diaphragm. The data detected by the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism can be summarized and corresponded, that is, the surface defects and metal defects of the diaphragm are detected at a certain length on the diaphragm, and the corresponding electrical weak point information can be seen to determine whether the corresponding defects affect the electrical performance. Finally, the report is output through the report output module for the user to view intuitively.

[0021] Furthermore, the electrical weak point detection mechanism includes a first conductive member and a second conductive member forming a gap with the first conductive member, and the diaphragm passes between the first conductive member and the second conductive member. The second conductive member contacts one side surface of the diaphragm, and the first conductive member contacts the other side surface of the diaphragm. The diaphragm then returns to the rewinding air shaft via the intermediate reel to form a test path for the diaphragm. The second conductive member is connected to the positive pole of the power supply, and the first conductive member is connected to the negative pole of the power supply. The electrical weak point information is obtained by detecting the changes in voltage and current between the two.

[0022] Furthermore, the electrical weak point detection mechanism further includes a slide rail, a fixture mounted on the slide rail and slidably connected to the slide rail, the second conductive member is mounted on the fixture, and the fixture moves on the slide rail to adjust the distance between the second conductive member and the first conductive member. The fixture facilitates replacement of the second conductive member, and the distance between the second conductive member and the first conductive member is adjusted by moving the fixture on the slide rail to adapt to diaphragms of different thicknesses.

[0023] Furthermore, the positioning and conveying mechanism includes an unwinding shaft, a plurality of intermediate rollers and a rewinding shaft, the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism are arranged from the unwinding shaft to the rewinding shaft; the meter is located between the defect detection mechanism and the unwinding shaft. After the length of the diaphragm is calculated by the meter, it passes through the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism in sequence. One meter can be used by three mechanisms, less data needs to be processed, and when correcting the initial position, it can be corrected in one direction, which is more convenient for data processing.

[0024] The present invention also provides a diaphragm defect detection method, comprising the following steps:

[0025] Step S1: placing the rolled diaphragm onto the positioning and conveying mechanism and completing the rolling operation;

[0026] Step S2: setting test parameters;

[0027] Step S3: Execute the test; the positioning and conveying mechanism retracts and releases the diaphragm at a set speed, and the data acquisition module of the controller collects data output by the meter, the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism;

[0028] Step S4: data processing; the data processing module corrects the initial positions of the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism; respectively records the type and position of the surface defects detected by the defect detection mechanism, the type and position of the metal defects detected by the metal foreign body detection mechanism, and the electrical weak point information of each position detected by the electrical weak point detection mechanism; the electrical weak point information includes the detection voltage and the detection current;

[0029] Step S5: The report output module takes the initial position as the starting point of the diaphragm length, generates electrical weak point information at different diaphragm lengths and diaphragm defects at corresponding positions of the electrical weak point information, and outputs a report.

[0030] The diaphragm defect detection method of the present invention tests the diaphragm after completing the rolling and testing parameters. When processing the data collected by the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism, the data processing module corrects the initial positions of the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism. Under the same length measurement unit of the meter, the data of the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism can be associated together, and there will be no deviation due to the different installation positions of the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism. After the final output report, the staff can intuitively see the electrical weak point information of the defect at a specific length of the diaphragm, so as to judge whether the defect will affect the electrical performance of the diaphragm.

[0031] Preferably, in step S4, the method for correcting the initial position is:

[0032] Set the detection reference point, correct the initial position of the defect detection mechanism to the diaphragm length difference between the defect detection mechanism data collection point and the detection reference point, set the initial position of the metal foreign matter detection mechanism to the diaphragm length difference between the metal foreign matter detection mechanism and the detection reference point, and set the initial position of the electrical weak point detection mechanism to the diaphragm length difference between the electrical weak point detection mechanism and the detection reference point.

[0033] Preferably, the winding operation includes starting the unwinding shaft and the winding shaft, allowing the diaphragm to pass through the defect detection mechanism, the metal foreign body detection mechanism and the electrical weak point detection mechanism in sequence through the intermediate roller and be wound on the winding shaft and wound at least three times.

[0034] Compared with the prior art, the beneficial effect of the present invention is that after the defect detection mechanism detects the surface defects of the diaphragm, the metal foreign matter detection mechanism re-inspects the diaphragm, detects the foreign matter on the diaphragm, determines whether the foreign matter is a metal foreign matter or a non-metallic foreign matter, and performs a second confirmation on the foreign matter defect, thereby making it more accurate to determine whether the surface affects the electrical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a diaphragm defect detection system;

[0036] Figure 2 It is a structural schematic diagram of an electrical weak point detection mechanism of a diaphragm defect detection system;

[0037] Figure 3It is a structural schematic diagram of a frame of a diaphragm defect detection system;

[0038] Figure 4 A flow chart of a diaphragm defect detection method.

[0039] In the attached drawings: 100, frame; 110, hatch; 120, trigger; 130, static electricity removal unit; 140, exhaust unit; 150, temperature and humidity detection unit; 160, support mechanism; 170, signal light; 200, meter; 300, unwinding shaft; 310, intermediate roller; 400, winding shaft; 500, defect detection mechanism; 510, second acquisition camera; 520, third light source; 600, metal foreign body detection mechanism; 610, first acquisition camera; 620, first light source; 630, second light source; 700, electrical weak point detection mechanism; 710, first conductive member; 720, second conductive member; 730, slide rail; 740, clamp; 800, shading plate. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0041] The same or similar numbers in the drawings of the embodiments of the present invention 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 this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] Embodiment 1

[0043] This embodiment is a first embodiment of a diaphragm defect detection system, comprising:

[0044] A defect detection mechanism 500, used for performing defect detection on the diaphragm;

[0045] A metal foreign body detection mechanism 600 is used to detect metal foreign bodies and / or pinholes of the diaphragm;

[0046] The positioning and conveying mechanism is used for positioning and conveying the diaphragm. The diaphragm passes through the defect detection mechanism 500 and the metal foreign body detection mechanism 600 in sequence through the positioning and conveying mechanism.

[0047] In this embodiment, the positioning and conveying mechanism, the defect detection mechanism 500 and the metal foreign body detection mechanism 600 are all installed in the frame 100. The positioning and conveying mechanism includes an unwinding shaft 300, a plurality of intermediate rollers 310 and a rewinding shaft 400, and the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 are arranged between the unwinding shaft 300 and the rewinding shaft 400.

[0048] Specifically, the metal foreign body detection mechanism 600 includes a first acquisition camera 610 and a first light source 620 located on one side of the diaphragm, and a second light source 630 located on the other side of the diaphragm; the light source port of the second light source 630 faces the acquisition port of the first acquisition camera 610, and the light of the first light source 620 and the light of the second light source 630 intersect on the diaphragm. The defect detection mechanism 500 includes a second acquisition camera 510 and a third light source 520 located on both sides of the diaphragm, respectively, and the light source port of the third light source 520 faces the acquisition port of the second acquisition camera 510.

[0049] The frame 100 is provided with a shading plate 800 between the defect detection mechanism 500 and the metal foreign body detection mechanism 600 , and the shading plate 800 is used to prevent the light of the first light source 620 and the second light source 630 from affecting the second acquisition camera 510 .

[0050] The working principle of this embodiment is as follows: the membrane roll is installed on the unwinding shaft 300, and the unwinding shaft 300 and the rewinding shaft 400 rotate at a set speed to realize the unwinding and recovery of the membrane. The arrangement of the intermediate roller allows the membrane to be tensioned and pass through the defect detection mechanism 500 and the metal foreign body detection mechanism 600 in sequence. When passing through the defect detection mechanism 500, the defect detection structure emits light to the second acquisition camera 510 through the third light source 520, forming a transmission effect on the membrane. At this time, the second acquisition camera 510 determines whether there are surface defects on the membrane by collecting images or brightness and other information, thereby identifying defects such as pinholes, transparency, missing coating, black spots, dark spots, stripes, scratches, etc. on the membrane. When passing through the metal foreign body detection mechanism 600, the first light source 620 irradiates the diaphragm, and the light is reflected by the diaphragm to the first acquisition camera 610, and the second light source 630 forms a reflection at the diaphragm. Since the first light source 620 and the second light source 630 intersect at the diaphragm, the information collected by the first acquisition camera 610 comes from the same diaphragm position. Regardless of whether the metal is irradiated with light in the visible light or invisible light band, the reflection characteristics are consistent. However, non-metals will show the original reflection characteristics. The different characteristics of metals and non-metals can distinguish between metal foreign bodies (conductors) and non-metal foreign bodies (insulators). At the same time, the metal foreign body detection mechanism 600 can also distinguish pinholes and transparent or thin spots according to the difference in the transmitted wavelength, and conduct secondary confirmation of the detection of the defect meter to avoid affecting the judgment of the results.

[0051] The beneficial effects of this embodiment are as follows: after the defect detection mechanism 500 detects the surface defects of the diaphragm, the metal foreign matter detection mechanism 600 re-inspects the diaphragm, detects the foreign matter on the diaphragm, determines whether the foreign matter is a metal foreign matter or a non-metallic foreign matter, and performs a second confirmation of the foreign matter defect, thereby making it more accurate to determine whether the surface affects the electrical performance.

[0052] Embodiment 2

[0053] This embodiment is a second embodiment of a diaphragm defect detection system, comprising:

[0054] A defect detection mechanism 500, used for performing defect detection on the diaphragm;

[0055] A metal foreign body detection mechanism 600 is used to detect metal foreign bodies and / or pinholes of the diaphragm;

[0056] An electrical weakness detection mechanism 700, used to collect electrical weakness information of the diaphragm;

[0057] A meter to calculate the length of the diaphragm;

[0058] A positioning and conveying mechanism, used for positioning and conveying the diaphragm, through which the diaphragm passes through the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 in sequence;

[0059] The controller is electrically connected to the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 respectively; it includes a data acquisition module for collecting data, a data processing module for summarizing and arranging the detection data, and a report output module.

[0060] In this embodiment, the positioning and conveying mechanism, the defect detection mechanism 500, the metal foreign body detection mechanism 600, the electrical weak point detection mechanism 700, and the meter 200 are all installed in the frame 100. The positioning and conveying mechanism includes an unwinding shaft 300, a plurality of intermediate rollers 310, and a rewinding shaft 400, and the defect detection mechanism 500, the metal foreign body detection mechanism 600, and the electrical weak point detection mechanism 700 are arranged between the unwinding shaft 300 and the rewinding shaft 400.

[0061] The defect detection mechanism 500 includes a second acquisition camera 510 and a third light source 520 respectively located on both sides of the diaphragm, and the light source port of the third light source 520 faces the acquisition port of the second acquisition camera 510; the metal foreign matter detection mechanism 600 includes a first acquisition camera 610 and a first light source 620 located on one side of the diaphragm, and a second light source 630 located on the other side of the diaphragm; the light source port of the second light source 630 faces the acquisition port of the first acquisition camera 610, and the light of the first light source 620 and the light of the second light source 630 intersect on the diaphragm.

[0062] The frame 100 is provided with a shading plate 800 between the defect detection mechanism 500 and the metal foreign body detection mechanism 600 , and the shading plate 800 is used to prevent the light of the first light source 620 and the second light source 630 from affecting the second acquisition camera 510 .

[0063] The electrical weak point detection mechanism 700 includes a first conductive member 710 located between two adjacent intermediate roller shafts 310 and a second conductive member 720 forming a gap with the first conductive member 710, and the diaphragm passes between the first conductive member 710 and the second conductive member 720. The first conductive member 710 is a metal roller, and the diaphragm can pass through the first conductive member 710 and the second conductive member 720 in a tensioned state.

[0064] The meter counter 200 is located between the defect detection mechanism 500 and the unwinding shaft 300. After the length of the diaphragm is calculated by the meter counter 200, it passes through the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 in sequence. One meter counter 200 can be used by three mechanisms, and less data needs to be processed. In addition, when correcting the initial position, it can be corrected in one direction, which is more convenient for data processing.

[0065] The working principle of this embodiment is as follows:

[0066] The membrane roll is installed on the unwinding shaft 300. The unwinding shaft 300 and the rewinding shaft 400 rotate at a set speed to realize the unwinding and recovery of the membrane. The arrangement of the intermediate roller allows the membrane to be tensioned and pass through the defect detection mechanism 500, the metal foreign matter detection mechanism 600 and the electrical weak point detection mechanism 700 in sequence. When passing through the defect detection mechanism 500, defects such as pinholes, transparency, missing coating, black spots, dark spots, stripes, scratches, etc. on the membrane can be identified. The metal foreign matter detection mechanism 600 can identify defects such as pinholes, metal foreign matter, and non-metallic foreign matter. The electrical weak point detection mechanism 700 can collect electrical weak point information and identify defects such as pinholes, scratches, and accumulation of conductive particles on the membrane. The meter 200 can calculate the length of the membrane. The data identified by the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 will be associated with the current length of the meter 200 when the corresponding data is collected after being collected by the data acquisition module. Since the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 are respectively located at different positions on the rack 100, the length data corresponding to the data detected by the three mechanisms will have deviations. The data processing module corrects the initial positions of the three mechanisms. After the correction is completed, the data detected by the three mechanisms can correspond to the same length of the membrane. The data detected by the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 can all be summarized and corresponded, that is, the surface defects and metal defects of the membrane are detected at a certain length on the membrane, and the corresponding electrical weak point information can be seen to determine whether the corresponding defects affect the electrical performance. Finally, the report is output through the report output module for the user to view intuitively.

[0067] Specifically, the defect detection structure emits light to the second acquisition camera 510 through the third light source 520, forming a transmission effect on the diaphragm. At this time, the second acquisition camera 510 determines whether there are surface defects on the diaphragm by collecting information such as images or brightness. The metal foreign body detection mechanism 600 irradiates the diaphragm through the first light source 620, and the diaphragm reflects to the first acquisition camera 610, and forms a reflection at the diaphragm through the second light source 630. Since the first light source 620 and the second light source 630 intersect at the diaphragm, the information collected by the first acquisition camera 610 comes from the same diaphragm position. Regardless of whether the metal is irradiated with light in the visible light or invisible light band, the reflection characteristics are consistent. However, non-metals will show the original reflection characteristics, and the different characteristics of metals and non-metals can distinguish metal foreign bodies (conductors) from non-metal foreign bodies (insulators). At the same time, the metal foreign body detection mechanism 600 can also distinguish pinholes and transparent or thin spots according to the difference in the transmitted wavelength, and conduct secondary confirmation of the detection of the defect instrument. The second conductive member 720 contacts one side of the membrane surface, and the first conductive member 710 contacts the other side of the membrane surface. The membrane then returns to the rewinding air shaft via the intermediate reel, forming a test path for the membrane. The second conductive member 720 is connected to the positive pole of the power supply, and the first conductive member 710 is connected to the negative pole of the power supply. The electrical weak point information is obtained by detecting the changes in voltage and current between the two.

[0068] In this embodiment, after collecting the data of the meter 200, the defect detection mechanism 500, the metal foreign matter detection mechanism 600 and the electrical weak point detection mechanism 700 through the controller and correlating them and correcting the initial positions of the defect detection mechanism 500, the metal foreign matter detection mechanism 600 and the electrical weak point detection mechanism 700, the data detected by the defect detection mechanism 500, the metal foreign matter detection mechanism 600 and the electrical weak point detection mechanism 700 can be summarized and correspond to the same diaphragm length. The staff can finally see the electrical weak point information of the defect at a specific length through the report, so as to judge whether the defect will affect the electrical performance of the diaphragm, thereby clearly knowing the diaphragm defects that affect the electrical performance of the diaphragm, and because the metal foreign matter detection mechanism can distinguish the type of foreign matter and whether it is a pinhole, the result in the report will not be misjudged due to unclear defect types.

[0069] In this embodiment, the second acquisition camera 510 and the first acquisition camera 610 are located on the same side, and the shading plate 800 is located therebetween. One end of the shading plate 800 is close to the diaphragm, and the other end is vertically higher than the acquisition port of the first acquisition camera, ensuring that the first light source 620 and the second light source 630 will not affect the second acquisition camera 510.

[0070] In this embodiment, three meter counters 200 may be provided, corresponding to the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the weakness detection mechanism respectively.

[0071] Embodiment 3

[0072] This embodiment is a third embodiment of a diaphragm defect detection system. This embodiment is similar to the second embodiment, except that the electrical weak point detection mechanism 700 is further limited.

[0073] The electrical weak point detection mechanism 700 further includes a slide rail 730 mounted on the frame 100, a fixture 740 mounted on the slide rail 730 and slidably connected to the slide rail 730, the second conductive member 720 is mounted on the fixture 740, and the fixture 740 moves on the slide rail 730 to adjust the distance between the second conductive member and the first conductive member 710. The fixture 740 facilitates replacement of the second conductive member 720, and the distance between the second conductive member and the first conductive member 710 is adjusted by moving the fixture 740 on the slide rail 730 to adapt to diaphragms of different thicknesses.

[0074] The second conductive member 720 is made of conductive rubber.

[0075] In this embodiment, a locking member that can be locked with the slide rail 730 is provided on the clamp 740. After the clamp 740 moves into position along the slide rail 730, the position of the clamp 740 is locked by the locking member to ensure that the clamp 740 will not shift during the test. The locking member can be a bolt or a quick lock.

[0076] In this embodiment, the first conductive member 710 is a copper roller having good conductive properties.

[0077] Embodiment 4

[0078] This embodiment is the fourth embodiment of a diaphragm defect detection system. This embodiment is similar to the second embodiment, except that the frame 100 is further limited.

[0079] The frame 100 is provided with a door 110 for closing the frame 100 and a trigger 120 for sensing that the door 110 is closed. The door 110 can isolate the space inside the frame 100 from the external environment, so as to prevent the on-site personnel from touching the components inside the frame 100 during the operation of the equipment and causing safety accidents. The detection can only be started after the trigger 120 senses the door 110, and the test stops when the door 110 is opened. The trigger 120 can be one of the devices such as a limit switch, a travel switch or an infrared sensor. The limit switch is selected in this embodiment. In order to reduce the number of doors 110 and isolate the internal and external environments of the frame 100 at the same time, the other positions can be closed by sheet metal parts or plastic parts except for one axial position and one radial position of the unwinding shaft 300 and the winding shaft 400. In this embodiment, in order to facilitate the opening and keeping of the hatch door 110 in the open state, one side of the hatch door 110 is rotatably connected to the frame 100, and the hatch door 110 is connected to the hatch door 110 through a support mechanism 160. The support mechanism can be a hydraulic rod or a gas spring, and the hatch door 110 is supported by the hydraulic rod or the gas spring. In order to show different opening conditions of the hatch door 110, a signal light 170 can also be provided to indicate it.

[0080] The rack 100 is also equipped with a lighting unit, a static electricity removal unit 130, an exhaust unit 140, and a temperature and humidity detection unit 150. When the static electricity removal unit 130 is turned on, the diaphragm under test can be static electricity removed to prevent static electricity from affecting the test results; the temperature and humidity in the test chamber can be reduced through the temperature and humidity detection unit 150 or the temperature and humidity in the rack 100, and then through the exhaust unit 140 to keep it within the range of 23°C ± 2°C required by the national standard.

[0081] The working principle of this embodiment is as follows: the signal light is set with three colors: red, green and yellow. Red means that the test is in progress, that is, there is a high voltage output at this time. This color reminds the on-site personnel that there is high voltage in the equipment and they should not open the equipment door 110 at will to avoid triggering the limit switch and causing the test to stop; green means that it is in standby mode, there is no high voltage output, and the door 110 is closed at this time, reminding the user that they can safely open the door 110 to put in and take out materials; yellow means that the door 110 is open, but there is no high voltage output. Before the test starts, the test can only be started when the signal light is green, because if the signal light is yellow, it means that the equipment door 110 is not closed, the limit switch does not sense the door 110, and the power supply will not work. When the equipment fails during the test, the test can be stopped by pressing the emergency stop unit, or the door 110 can be directly opened to stop the test through the action of the limit switch.

[0082] Embodiment 5

[0083] This embodiment is a first embodiment of a diaphragm defect detection method, based on the diaphragm defect detection system described in the above-mentioned embodiments 2 to 4, comprising the following steps:

[0084] Step S1: placing the rolled diaphragm onto the unwinding shaft 300 and completing the rolling operation;

[0085] Step S2: setting test parameters;

[0086] Step S3: Execute the test; the unwinding shaft 300 and the rewinding shaft 400 retract and unwind the diaphragm at a set speed, and the data acquisition module of the controller collects data output by the meter 200, the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700;

[0087] Step S4: Data processing; the data processing module corrects the initial positions of the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700; respectively records the type and position of the surface defect detected by the defect detection mechanism 500, the type and position of the metal defect detected by the metal foreign body detection mechanism 600, and the electrical weak point information of each position detected by the electrical weak point detection mechanism 700; the electrical weak point information includes the detection voltage and the detection current; the above position refers to the length, that is, the data of the meter 200. The electrical weak point information includes voltage, current, and winding speed.

[0088] The method to correct the initial position is:

[0089] The detection reference point is set, and the initial position of the defect detection mechanism 500 is corrected to the difference in diaphragm length between the data collection point of the defect detection mechanism 500 and the detection reference point, and the initial position of the metal foreign body detection mechanism 600 is the difference in diaphragm length between the metal foreign body detection mechanism 600 and the detection reference point, and the initial position of the electrical weak point detection mechanism 700 is the difference in diaphragm length between the electrical weak point detection mechanism 700 and the detection reference point. Due to the different installation positions of different detection mechanisms, the corresponding meter 200 has different data when the same position of the diaphragm is moved to the detection mechanism, and the existence of this deviation will cause the diaphragm to have a defect at a certain length, but the corresponding electrical weak point information cannot be directly found for this defect. The diaphragm length difference is the difference between the meter 200 data corresponding to the detection reference point and the meter 200 data corresponding to the detection structure, so the data will have a deviation, and the existence of this deviation will cause the diaphragm to have a defect at a certain length, but the corresponding electrical weak point information cannot be directly found for this defect. The corrected initial position of the defect detection mechanism 500, the corrected initial position of the metal foreign body detection mechanism 600 and the corrected initial position of the electrical weak point detection mechanism 700 are obtained by subtracting the data of the meter counter 200 corresponding to the detection reference point from the data of the meter counter 200 corresponding to the initial position of the defect detection mechanism 500. If the detection reference point is set as the initial position of the defect detection mechanism 500, that is, the initial position of the defect detection mechanism 500 is consistent with the corrected initial position, the result of the defect detection mechanism 500 detection corresponds to the true value of the data of the meter counter 200, and the corrected initial position of the metal foreign body detection mechanism 600 is the actual value of the data of the meter counter 200 corresponding to the metal foreign body detection mechanism 600 minus the diaphragm length difference, and the corrected initial position of the electrical weak point detection mechanism 700 is the same.

[0090] For example, in a specific embodiment, the length of the diaphragm between the metal foreign body detection mechanism 600 and the defect detection mechanism 500 is 0.25 meters, and the data of the meter 200 corresponding to the metal foreign body detection mechanism 600 is reduced by 0.25 meters. The length of the diaphragm between the electrical weak point detection mechanism 700 and the defect detection mechanism 500 is 0.959 meters, and the data of the meter 200 corresponding to the electrical weak point detection mechanism 700 is reduced by 0.959 meters.

[0091] Step S5: The report output module takes the initial position as the starting point of the diaphragm length, generates the electrical weakness information at different diaphragm lengths and the diaphragm defects at the corresponding positions of the electrical weakness information, and outputs a report. The report records the basic information of the diaphragm, test voltage, detection current, winding speed and other test parameters, and the final result of the number of electrical weakness points and the number of electrical weakness points per square meter.

[0092] The diaphragm defect detection method of the present invention tests the diaphragm after completing the rolling and testing parameters. When processing the data collected by the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700, the data processing module corrects the initial position of the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700. Under the same length measurement unit of the meter 200, the data of the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 can be associated together, and there will be no deviation due to the different installation positions of the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700. After the final output report, the staff can intuitively see the electrical weak point information at a specific length where there is a defect, so as to determine whether the defect will affect the electrical performance of the diaphragm.

[0093] The detection method of this embodiment can simultaneously obtain three detection results for the diaphragm, and summarize the three detection results into a report corresponding to the same length data of the diaphragm. For example, defects and electrical weak point information corresponding to the defects can be displayed at a diaphragm length of 1 meter, so that the staff can intuitively and quickly know through the report whether the defects affect the electrical performance, and also allow the staff to know the diaphragm defects that affect the electrical performance.

[0094] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] Embodiment 5

[0096] This embodiment is the fifth embodiment of the diaphragm defect detection method. This embodiment is similar to the first embodiment, except that:

[0097] Before executing step S1, it is necessary to prepare the sample first, specifically: in a clean room environment, at least peel off the outermost three layers of the diaphragm roll, and place it at 23°C ± 2°C and relative humidity 50% ± 5% for 24 hours.

[0098] The winding operation includes starting the unwinding shaft 300 and the winding shaft 400, allowing the diaphragm to pass through the defect detection mechanism 500, the metal foreign body detection mechanism 600 and the electrical weak point detection mechanism 700 in sequence through the intermediate roller 310 and be wound on the winding shaft 400 and wound at least three times.

[0099] The test parameter settings include setting the test voltage, weak current, test speed, test length, sample thickness, sample width, and diaphragm type. You can also set the report parameters, including the inspection unit, report number, sample number, and test personnel.

[0100] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. 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 claims of the present invention.

Claims

1. A diaphragm defect detection system, characterized in that: include A defect detection mechanism (500) for performing defect detection on the diaphragm; A metal foreign body detection mechanism (600) is used to detect metal foreign bodies on the diaphragm; The positioning and conveying mechanism is used for positioning and conveying the diaphragm, and the diaphragm passes through the defect detection mechanism (500) and the metal foreign matter detection mechanism (600) through the positioning and conveying mechanism.

2. The diaphragm defect detection system according to claim 1, characterized in that: The metal foreign body detection mechanism (600) comprises a first acquisition camera (610) located on one side of the diaphragm, a first light source (620), and a second light source (630) located on the other side of the diaphragm; the light source port of the second light source (630) faces the acquisition port of the first acquisition camera (610), and the light of the first light source (620) and the light of the second light source (630) intersect on the diaphragm.

3. The diaphragm defect detection system according to claim 2, characterized in that: The light from the first light source (620) is reflected by the diaphragm to the first acquisition camera (610); and the light from the second light source (630) is transmitted by the diaphragm to the first acquisition camera (610).

4. The diaphragm defect detection system according to claim 2, characterized in that: The defect detection mechanism (500) comprises a second acquisition camera (510) and a third light source (520) respectively located on both sides of the diaphragm, and the light source port of the third light source (520) faces the acquisition port of the second acquisition camera (510).

5. The diaphragm defect detection system according to claim 4, characterized in that: A light shielding plate (800) is provided between the defect detection mechanism (500) and the metal foreign matter detection mechanism (600).

6. The diaphragm defect detection system according to any one of claims 1 to 5, characterized in that: Also includes: An electrical weakness detection mechanism (700) for collecting electrical weakness information of the diaphragm; The diaphragm passes through the defect detection mechanism (500), the metal foreign matter detection mechanism (600) and the electrical weak point detection mechanism (700) through the positioning and conveying mechanism; Controller, data processing module and report output module for summarizing and collating detection data.

7. The diaphragm defect detection system according to claim 6, characterized in that: The electrical weak point detection mechanism (700) comprises a first conductive member (710) and a second conductive member (720) forming a gap with the first conductive member (710), and the diaphragm passes between the first conductive member (710) and the second conductive member (720).

8. The diaphragm defect detection system according to claim 7, characterized in that: The electrical weak point detection mechanism (700) further comprises a slide rail (730), a clamp (740) mounted on the slide rail (730) and slidably connected to the slide rail (730), the second conductive member (720) being mounted on the clamp (740), and the clamp (740) moving on the slide rail (730) to adjust the distance between the second conductive member (720) and the first conductive member (710).

9. The diaphragm defect detection system according to claim 6, characterized in that: The positioning and conveying mechanism comprises an unwinding shaft (300), a plurality of intermediate rollers (310) and a rewinding shaft (400); the defect detection mechanism (500), the metal foreign matter detection mechanism (600) and the electrical weak point detection mechanism (700) are arranged from the unwinding shaft (300) to the rewinding shaft (400); and the meter (200) is located between the defect detection mechanism (500) and the unwinding shaft (300).

10. A method for detecting diaphragm defects, characterized in that: The diaphragm defect detection system according to any one of claims 6 to 9 comprises the following steps: Step S1: placing the rolled diaphragm onto the positioning and conveying mechanism and completing the rolling operation; Step S2: setting test parameters; Step S3: Execute the test; the positioning and conveying mechanism retracts and releases the diaphragm at a set speed, and the data acquisition module of the controller collects data output by the meter (200), the defect detection mechanism (500), the metal foreign body detection mechanism (600) and the electrical weak point detection mechanism (700); Step S4: data processing; the data processing module corrects the initial positions of the defect detection mechanism (500), the metal foreign body detection mechanism (600) and the electrical weak point detection mechanism (700); respectively records the type and position of the surface defect detected by the defect detection mechanism (500), the type and position of the metal defect detected by the metal foreign body detection mechanism (600), and the electrical weak point information of each position detected by the electrical weak point detection mechanism (700); the electrical weak point information includes the detection voltage and the detection current; Step S5: The report output module takes the initial position as the starting point of the diaphragm length, generates electrical weak point information at different diaphragm lengths and diaphragm defects at corresponding positions of the electrical weak point information, and outputs a report.

11. The diaphragm defect detection method according to claim 10, characterized in that: In step S4, the method for correcting the initial position is: The detection reference point is set, the initial position of the defect detection mechanism (500) is corrected to the difference in diaphragm length between the data collection point of the defect detection mechanism (500) and the detection reference point, the initial position of the metal foreign matter detection mechanism (600) is corrected to the difference in diaphragm length between the metal foreign matter detection mechanism (600) and the detection reference point, and the initial position of the electrical weak point detection mechanism (700) is corrected to the difference in diaphragm length between the electrical weak point detection mechanism (700) and the detection reference point.

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