Film defect detection system

Abstract

The utility model provides a film defect detection system which comprises a first conductive part and a second conductive part which are respectively arranged on two opposite sides of a film. The first conductive part is provided with a conductive channel; during detection, the two surfaces of the film can be in contact with the conductive channel and the second conductive part respectively to form a circuit branch; the circuit branch can move in the first direction relative to the film so as to judge the defect condition on the film according to changes generated by electrical characteristic parameters of the circuit branch. The membrane defect detection system can ensure the accuracy and efficiency of membrane defect detection, improve the safety and stability of the battery, and ensure the quality of the finished battery.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a membrane defect detection system. Background Art

[0002] As a crucial component of batteries, the quality and integrity of the separator (including the solid electrolyte membrane) directly impacts battery performance and safety. Due to various complex factors during the manufacturing process, separators may develop defects such as holes and cracks. These defects not only reduce the battery's energy density and lifespan but may also cause safety issues. Therefore, separator defect detection is a crucial step in the battery manufacturing process. Improving the accuracy and efficiency of separator defect detection is a pressing issue for battery manufacturers. Utility Model Content

[0003] Traditional methods for detecting membrane defects primarily include manual inspection and automated inspection based on image processing. While manual inspection is simple, it is subject to visual fatigue and subjective perception, making it prone to missed detections and misjudgments. While automated inspection methods based on image processing can improve detection efficiency, they still present several challenges in practical applications. For example, factors such as uneven lighting, shadows, and reflections can hinder the accuracy and stability of image processing algorithms. Furthermore, image processing algorithms struggle to accurately identify and locate even minor defects. Therefore, addressing the limitations and shortcomings of traditional inspection methods, it is necessary to design more accurate membrane defect detection systems.

[0004] The purpose of the utility model is to provide a membrane defect detection system, which can ensure the accuracy and efficiency of membrane defect detection, improve the safety and stability of batteries, and ensure the quality of finished battery products.

[0005] An embodiment of the present invention provides a film defect detection system, comprising a first conductive component and a second conductive component, wherein the first conductive component and the second conductive component are respectively arranged on opposite sides of a film;

[0006] The first conductive component is provided with a conductive channel; during detection, the two sides of the film can respectively contact the conductive channel and the second conductive component to form a circuit branch;

[0007] The circuit branch can move relative to the film along a first direction, so as to determine defects on the film according to changes in electrical characteristic parameters of the circuit branch.

[0008] In one achievable manner, the first conductive component and / or the second conductive component is movable relative to the membrane along the first direction, so that the circuit branch moves relative to the membrane along the first direction.

[0009] In one achievable method, the present invention further includes:

[0010] A measuring module is electrically connected to the conductive channels on the second conductive component and the first conductive component respectively; the measuring module is used to detect electrical characteristic parameters of the circuit branch.

[0011] In one achievable manner, the electrical characteristic parameter includes at least one of resistance, voltage, and current.

[0012] In one feasible manner, a plurality of conductive channels are provided on the first conductive component, and the plurality of conductive channels are arranged at intervals along the second direction, and adjacent conductive channels are electrically insulated from each other, and circuit branches are formed between each conductive channel, the film and the second conductive component; wherein the second direction is perpendicular to the first direction.

[0013] In one feasible manner, an insulating portion is provided between adjacent conductive channels; the number of the first conductive components is at least two, and at least two first conductive components are arranged along the first direction; and among every two adjacent first conductive components, each conductive channel on one of the first conductive components corresponds to each insulating portion on the other first conductive component.

[0014] In one achievable method, the present invention further includes:

[0015] The measuring module is electrically connected to each conductive channel on the second conductive component and the first conductive component respectively; the measuring module is used to detect the electrical characteristic parameters of each circuit branch.

[0016] In one achievable method, the present invention further includes:

[0017] A data processing module is connected to the measurement module; the data processing module is used to calculate the position of the defect of the membrane in the first direction and the second direction based on the movement distance of the circuit branch relative to the membrane in the first direction and the position of the conductive channel corresponding to the defect of the membrane in the second direction.

[0018] In one achievable method, the present invention further includes:

[0019] A defect detection device is capable of identifying defects of the film; the defect detection device is used to locate the position of the defect of the film in a second direction; wherein the second direction is perpendicular to the first direction.

[0020] In one achievable manner, the defect detection device is a photoelectric detection device.

[0021] In one feasible embodiment, the defect detection device and the first conductive component are located on the same side of the membrane; the first conductive component is capable of moving relative to the membrane along the first direction, and along the moving direction of the first conductive component relative to the membrane, the defect detection device is located upstream of the first conductive component.

[0022] In one achievable manner, the defect detection device and the first conductive component are capable of synchronously moving relative to the film along the first direction.

[0023] In one achievable manner, the defect detection device is movable relative to the film along the second direction to locate the position of the defect of the film in the second direction.

[0024] In one achievable method, the present invention further includes:

[0025] a measuring module, electrically connected to the conductive channels on the second conductive component and the first conductive component respectively; the measuring module is used to detect electrical characteristic parameters of the circuit branch;

[0026] A data processing module is connected to the measurement module; the data processing module is used to calculate the position of the defect of the membrane in the first direction and the second direction based on the movement distance of the circuit branch relative to the membrane in the first direction and the movement distance of the defect detection device in the second direction.

[0027] In one possible implementation, the first conductive component includes a conductive roller, and the conductive channel is provided on the outer peripheral surface of the conductive roller; the second conductive component includes a conductive pad for supporting the film;

[0028] The conductive roller can roll on the film along the first direction; and / or the conductive pad can move along the first direction and drive the film to move along the first direction.

[0029] In one achievable manner, the first conductive component includes a first conductive roller, and the conductive channel is provided on the outer peripheral surface of the first conductive roller; the second conductive component includes a second conductive roller; the first conductive roller and the second conductive roller can simultaneously roll relative to the film along the first direction.

[0030] In one achievable manner, the first conductive component and the second conductive component are in contact with surfaces on opposite sides of the film respectively; along the second direction, the size of the first conductive component and the size of the second conductive component are both greater than or equal to the size of the film.

[0031] The membrane defect detection system provided by the present invention is characterized in that a first conductive component and a second conductive component are provided, and a circuit branch is formed between the conductive channel on the first conductive component, the membrane and the second conductive component, and the circuit branch can move relative to the membrane along a first direction; since the electrical characteristic parameters of the circuit branch are different at the defective position of the membrane and the non-defective position of the membrane, during the movement of the circuit branch relative to the membrane, the electrical characteristic parameters of the circuit branch are detected in real time. When it is detected that the electrical characteristic parameters of the circuit branch exceed a preset range, it can be determined that there is a defect at the corresponding position of the membrane, thereby quickly determining whether there is a defect on the membrane, ensuring the accuracy of membrane defect detection, improving the safety and stability of the battery, and ensuring the quality of the finished battery product.

[0032] Furthermore, when the electrical characteristic parameters of a circuit branch detected in real time exceed a preset range, the position of the membrane defect in the first direction can be calculated based on the distance the circuit branch has moved relative to the membrane in the first direction, thereby quickly determining the location of the membrane defect. This membrane defect detection system offers advantages such as high detection efficiency, a simple structure, ease of operation, and low cost. The membrane defect detection system provided by this utility model can be applied to both common diaphragms and solid electrolyte membranes. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural diagram of the film defect detection system in the first embodiment of the present utility model.

[0034] Figure 2 for Figure 1 side view.

[0035] Figure 3 for Figure 1 Side view in the other direction.

[0036] Figure 4 Schematic diagram of the three-dimensional structure of the first conductive component in the first embodiment of the present utility model.

[0037] Figure 5 Schematic diagram of the connection relationship among the data processing module, the measurement module, the first conductive component and the second conductive component in the first embodiment of the present utility model.

[0038] Figure 6 This is a schematic diagram of an electrical connection method between the first conductive component and the measurement module in the first embodiment of the present utility model.

[0039] Figure 7 Schematic diagram of another electrical connection method between the first conductive component and the measurement module in the first embodiment of the present utility model.

[0040] Figure 8 This is a schematic diagram of the detection results of the film defect detection system in the first embodiment of the present utility model.

[0041] Figure 9 This is a structural diagram of a film defect detection system in another embodiment of the present invention.

[0042] Figure 10 This is a structural diagram of a film defect detection system in the second embodiment of the present invention.

[0043] Figure 11 for Figure 10 side view.

[0044] Figure 12 for Figure 10 Side view in the other direction.

[0045] Figure 13 Schematic diagram of the three-dimensional structure of the first conductive component in the second embodiment of the present utility model.

[0046] Figure 14 Schematic diagram of the connection relationship among the data processing module, the measurement module, the first conductive component and the second conductive component in the second embodiment of the present invention.

[0047] Figure 15 This is a schematic diagram of the detection results of the film defect detection system in the second embodiment of the present utility model.

[0048] In the figure: 1-first conductive component, 10-roller, 11-conductive channel, 12-insulating part, 100-circuit branch, 2-second conductive component, 3-measuring module, 4-data processing module, 5-defect detection device, 6-membrane, 7-wire, 8-conductive reed, 81-pin. DETAILED DESCRIPTION

[0049] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0050] The terms "first", "second", "third", "fourth" and so on (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0051] The directional terms "up," "down," "left," "right," "front," "back," "top," and "bottom" (if any) used in the specification and claims of this utility model are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are intended only for clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this utility model.

[0052] First embodiment

[0053] like Figures 1 to 4 As shown, the film defect detection system provided by the first embodiment of the present invention is used to detect whether there are defects on the film 6 (not shown). The film defect detection system includes a first conductive component 1 and a second conductive component 2, both of which are capable of conducting electricity. The first conductive component 1 and the second conductive component 2 are respectively used to be arranged on opposite sides of the film 6.

[0054] The first conductive component 1 is provided with a conductive path 11; during testing, when the first conductive component 1 and the second conductive component 2 are respectively arranged on opposite sides of the film 6, the two sides of the film 6 can be in contact with the conductive path 11 and the second conductive component 2 respectively, so that a circuit branch 100 is formed between the conductive path 11, the film 6 and the second conductive component 2 (because the circuit branch 100 is invisible to the naked eye, Figure 2 and Figure 3 The circuit branch 100 is represented by a dotted line in FIG.

[0055] The circuit branch 100 is capable of moving relative to the membrane 6 in a first direction X, so that defects on the membrane 6 can be determined based on changes in the electrical characteristic parameters of the circuit branch 100. Specifically, because the electrical characteristic parameters of the circuit branch 100 are different at a defective location and a non-defective location of the membrane 6 (a defective location of the membrane 6 refers to a portion of the membrane 6 with a defect; a non-defective location of the membrane 6 refers to a portion of the membrane 6 without a defect, i.e., a normal portion of the membrane 6), during the movement of the circuit branch 100 relative to the membrane 6, the electrical characteristic parameters of the circuit branch 100 are detected in real time. If the electrical characteristic parameters of the circuit branch 100 are detected to be outside a preset range, it can be determined that a defect exists at the corresponding location of the membrane 6, thereby enabling rapid determination of whether the membrane 6 has a defect.

[0056] The membrane 6 is a diaphragm, which can be a diaphragm for solid-state batteries (including solid electrolyte membranes) or a diaphragm for liquid batteries, etc.; of course, the membrane 6 can also be used for other purposes. The membrane 6 can be an insulating structure or have a certain degree of conductivity. When there are defects such as holes or cracks on the membrane 6, the electrical properties at the defective location of the membrane 6 are different from those at other normal locations, which is specifically manifested as a difference in resistance value. According to tests, the resistance value at the defective location of the membrane 6 is significantly lower than the resistance value at the non-defective location of the membrane 6. Therefore, by detecting the electrical characteristic parameters of the circuit branch 100, when the detected electrical characteristic parameters change, it indicates that there may be a defect in the membrane 6 at the location where the electrical characteristic parameters change.

[0057] The electrical characteristic parameter of the circuit branch 100 includes at least one of resistance, voltage, and current. Of course, in other embodiments, the electrical characteristic parameter may also be other parameters related to resistance.

[0058] As an embodiment, the film defect detection system can also detect the position of the defect of the film 6 in the first direction X. Specifically, when the electrical characteristic parameters of the circuit branch 100 detected in real time exceed a preset range, the position of the defect of the film 6 in the first direction X can be calculated based on the movement distance of the circuit branch 100 relative to the film 6 in the first direction X (specifically, the position coordinates of the defect of the film 6 in the first direction X can be calculated) to quickly determine the location of the film defect.

[0059] The membrane defect detection system provided by the embodiment of the present invention is configured to form a circuit branch 100 between the conductive channel 11 on the first conductive component 1, the membrane 6 and the second conductive component 2, and the circuit branch 100 can move relative to the membrane 6 along the first direction X. Since the electrical characteristic parameters of the circuit branch 100 are different at the defective position of the membrane 6 and the non-defective position of the membrane 6, during the movement of the circuit branch 100 relative to the membrane 6, the electrical characteristic parameters of the circuit branch 100 are detected in real time. When it is detected that the electrical characteristic parameters of the circuit branch 100 exceed a preset range, it can be determined that there is a defect at the corresponding position of the membrane 6. In this way, it is possible to quickly determine whether there is a defect on the membrane 6, thereby ensuring the accuracy of membrane defect detection, improving the safety and stability of the battery, and ensuring the quality of the finished battery. Moreover, when the electrical characteristic parameters of the circuit branch 100 detected in real time exceed the preset range, the position of the defect of the membrane 6 in the first direction X can be calculated based on the movement distance of the circuit branch 100 relative to the membrane 6 in the first direction X, so as to quickly determine the position of the membrane defect. The membrane defect detection system has the advantages of high detection efficiency, simple structure, easy operation and low cost.

[0060] like Figure 1 and Figure 3 As shown, as an embodiment, the first conductive component 1 and / or the second conductive component 2 can move relative to the membrane 6 along the first direction X, so that the circuit branch 100 moves relative to the membrane 6 along the first direction X. Specifically, the membrane 6 can be stationary, and the first conductive component 1 and / or the second conductive component 2 can move relative to the membrane 6 along the first direction X; or the first conductive component 1 and / or the second conductive component 2 can be stationary, and the membrane 6 can move relative to the first conductive component 1 and / or the second conductive component 2 along the first direction X.

[0061] As an embodiment, the membrane 6 has a certain conductivity (for example, the membrane 6 is a separator for solid-state batteries), and the circuit branch 100 can be conductive at the defective position of the membrane 6 and the non-defective position of the membrane 6 (that is, the circuit branch 100 is a passage, that is, a circuit passage can be formed between the conductive channel 11, the membrane 6 and the second conductive component 2).

[0062] As another embodiment, the membrane 6 is an insulating structure, and at a defective position of the membrane 6, the circuit branch 100 can be conductive (specifically, at a defective position of the membrane 6, a path can be formed between the conductive channel 11 and the second conductive component 2 through discharge); at a non-defective position of the membrane 6, the circuit branch 100 is disconnected (that is, the circuit branch 100 is open, that is, there is no conductivity between the conductive channel 11, the membrane 6 and the second conductive component 2). For example, at a non-defective position of the membrane 6, the resistance value of the circuit branch 100 is infinite.

[0063] like Figures 1 to 4 As shown, as an embodiment, a plurality of conductive channels 11 are provided on the first conductive component 1, and the plurality of conductive channels 11 are arranged at intervals along the second direction Y. Adjacent conductive channels 11 are electrically insulated, and circuit branches 100 are respectively formed between each conductive channel 11, the film 6 and the second conductive component 2 (that is, the plurality of conductive channels 11, the film 6 and the second conductive component 2 respectively form a plurality of circuit branches 100); wherein the second direction Y is perpendicular to the first direction X.

[0064] Specifically, the film defect detection system can also detect the position of the defect in the film 6 in the second direction Y. When the electrical characteristic parameters of the circuit branch 100 detected in real time exceed the preset range, the position of the defect in the film 6 in the second direction Y can be calculated (specifically, the position coordinates of the defect in the second direction Y can be calculated) based on the position of the conductive path 11 corresponding to the defect in the film 6 (i.e., the conductive path 11 corresponding to the circuit branch 100 whose electrical characteristic parameters exceed the preset range) in the second direction Y. At the same time, combined with the position of the defect in the film 6 in the first direction X obtained by the above calculation, the position of the defect in the film 6 can be accurately obtained.

[0065] For example, during the movement of the first conductive component 1 and / or the second conductive component 2 relative to the membrane 6, when it is detected that the electrical characteristic parameters of a circuit branch 100 have changed and exceeded a preset range, the position of the defect of the membrane 6 in the first direction X is calculated based on the movement distance of the circuit branch 100 relative to the membrane 6 in the first direction X, and the position of the defect of the membrane 6 in the second direction Y is calculated based on the position of the conductive channel 11 corresponding to the circuit branch 100 in the second direction Y, thereby obtaining the accurate position of the defect of the membrane 6.

[0066] like Figures 1 to 3As shown, as an embodiment, the first conductive component 1 and the second conductive component 2 are in contact with the surfaces on opposite sides of the membrane 6 respectively. At the same time, at least one of the first conductive component 1 and the second conductive component 2 applies pressure to the membrane 6 during the movement, so that the first conductive component 1 and the second conductive component 2 can be in close contact with the surface of the membrane 6, that is, there is no gap between the first conductive component 1 and the second conductive component 2 and the surface of the membrane 6, so that a stable circuit branch 100 can be formed between the conductive channel 11, the membrane 6 and the second conductive component 2, and the circuit branch 100 can be conductive at the defective position of the membrane 6.

[0067] like Figures 1 to 3 As shown, as an embodiment, along the second direction Y, the size of the first conductive component 1 and the size of the second conductive component 2 are both greater than or equal to the size of the membrane 6, so that the detection range of the first conductive component 1 and the second conductive component 2 can completely cover the membrane 6.

[0068] like Figures 1 to 3 As shown, as an embodiment, along the first direction X, the size of the second conductive component 2 is greater than or equal to the size of the film 6 , and the size of the first conductive component 1 is smaller than the size of the film 6 .

[0069] like Figures 1 to 4 As shown, as an embodiment, on the first conductive component 1 , an insulating portion 12 is provided between adjacent conductive channels 11 , that is, adjacent conductive channels 11 are insulated and separated by the insulating portion 12 .

[0070] like Figures 1 to 4 As shown, as one embodiment, the first conductive component 1 includes a conductive roller extending along a second direction Y (i.e., the axial direction of the conductive roller is parallel to the second direction Y). A plurality of conductive channels 11 are spaced apart on the outer circumference of the conductive roller, and the plurality of conductive channels 11 are spaced apart and parallel to the axial direction of the conductive roller. The second conductive component 2 includes a conductive pad for supporting the film 6, with the conductive roller positioned above the conductive pad. The conductive roller can roll on the film 6 along the first direction X; and / or the conductive pad can move along the first direction X, thereby driving the film 6 along the first direction X.

[0071] During use, the film 6 is laid flat on the conductive pad, ensuring that the film 6 is wrinkle-free. Then, a conductive roller is placed on the film 6 with the pressure required by the process, ensuring that the conductive roller and the conductive pad are in close contact with the film 6, thereby forming a stable circuit branch 100 between the conductive path 11, the film 6, and the second conductive component 2. The pressure applied by the conductive roller on the film 6 should not be too high or too low, as long as the conductive roller and the conductive pad are in good contact with the film 6. Excessive pressure from the conductive roller may damage the film 6, while too low a pressure may result in poor contact, affecting detection accuracy.

[0072] Specifically, in this embodiment, the conductive roller is connected to a first driving device (not shown), which can be a motor or a pneumatic device; the first driving device is used to drive the conductive roller to roll on the film 6 at a constant speed (specifically, Figure 3 As shown, in this embodiment, the conductive roller can roll to the right along the direction indicated by the arrow S1 on the film 6), for example, 5 mm / s, to ensure that the conductive roller can apply uniform pressure on the film 6 during the rolling process; during the rolling process of the conductive roller, the conductive pad remains stationary, so the film 6 also remains stationary.

[0073] In other embodiments, the conductive pad can be moved along the first direction X and drive the film 6 to move along the first direction X, while the conductive roller does not move in the first direction X (the conductive roller only rolls and does not move). In this case, a second driving device (not shown) can be provided to drive the conductive pad to move along the first direction X. The second driving device can be, for example, a conveyor belt. That is, when in use, the conductive pad can be placed on the conveyor belt, and the conveyor belt can be used to drive the conductive pad to move.

[0074] In other embodiments, the conductive roller may be capable of rolling on the film 6 along the first direction X, and the conductive pad may be capable of moving along the first direction X. It should be noted that when both the conductive roller and the conductive pad are capable of moving along the first direction X, the conductive roller and the conductive pad generally move relative to each other in opposite directions (for example, the conductive roller may roll rightward on the film 6, and the conductive pad may move leftward, thereby driving the film 6 to move leftward).

[0075] Of course, in other embodiments, the first conductive component 1 and / or the second conductive component 2 may also have other structural forms. For example, the first conductive component 1 and the second conductive component 2 may both be conductive rollers. Specifically, the first conductive component 1 includes a first conductive roller extending along the second direction Y, with the conductive channel 11 provided on the outer circumferential surface of the first conductive roller; the second conductive component 2 includes a second conductive roller extending along the second direction Y; the first conductive roller and the second conductive roller are capable of simultaneously rolling relative to the film 6 along the first direction X to maintain vertical alignment of the first and second conductive rollers.

[0076] like Figure 4 As shown, as an embodiment, the conductive channel 11 is an annular structure and is arranged around the circumference of the conductive roller. Therefore, during the rolling process of the conductive roller, the conductive channel 11 on the surface of the conductive roller can always contact the surface of the membrane 6, thereby ensuring the accuracy of the detection result.

[0077] like Figure 4As shown, as an embodiment, the conductive channel 11 is a conductor arranged on the surface of the conductive roller. The conductor can specifically be a conductive film, a conductive layer, a conductive metal ring and other structures; the conductor can be fixed on the surface of the conductive roller by sleeve mounting, bonding and the like, or can be formed on the surface of the conductive roller by coating, etching, electroplating and the like.

[0078] like Figure 4 As shown in the figure, as an embodiment, the insulating portion 12 may be an insulating varnish, insulating film, or other structure provided on the surface of the conductive roller. The roller body 10 of the conductive roller is cylindrical and may be an insulator, conductor, or semiconductor. When the roller body 10 is a conductor, insulation treatment is required between the conductive channels 11 and the roller body 10 to prevent electrical connection between the conductive channels 11 through the roller body 10. The roller body 10 may be solid or hollow (i.e., tubular).

[0079] like Figure 2 and Figure 4 As shown, as an embodiment, along the second direction Y, the size of the conductive channel 11 is greater than or equal to the size of the insulating portion 12, that is, the width of the conductive channel 11 is greater than or equal to the width of the insulating portion 12. Preferably, along the second direction Y, the size of the conductive channel 11 is greater than the size of the insulating portion 12.

[0080] As an implementation manner, along the second direction Y, the size of the conductive channel 11 is 100 nm to 10 mm, that is, the width of the conductive channel 11 is 100 nm to 10 mm.

[0081] As an implementation method, the conductive pad has excellent electrical conductivity and pressure resistance, and the conductive pad can be a stainless steel pad or a copper pad.

[0082] like Figures 1 to 3 As shown, as an embodiment, the number of the first conductive component 1 is one.

[0083] like Figure 9As shown, as another embodiment, the number of first conductive components 1 is at least two, and at least two first conductive components 1 are arranged along the first direction X (specifically, in this embodiment, the number of first conductive components 1 is two, and the two first conductive components 1 are arranged at intervals along the first direction X. Of course, in other embodiments, the number of first conductive components 1 can be more). In each of two adjacent first conductive components 1, each conductive channel 11 on one first conductive component 1 corresponds to each insulating portion 12 on the other first conductive component 1. By adopting a plurality of first conductive components 1, the conductive channels 11 of the plurality of first conductive components 1 are staggered, so that the conductive channels 11 of the plurality of first conductive components 1 can cover the film 6 in the second direction Y, thereby enabling the detection range of the plurality of first conductive components 1 to completely cover the film 6, thereby avoiding missed detection of defects at the gap positions between the conductive channels 11.

[0084] like Figure 5 As shown, as an embodiment, the membrane defect detection system also includes a measurement module 3, which is electrically connected to the second conductive component 2 and each conductive channel 11 on the first conductive component 1, respectively. The measurement module 3 is used to detect the electrical characteristic parameters of each circuit branch 100; at the same time, the measurement module 3 can also record the measured data.

[0085] Specifically, in this embodiment, the measurement module 3 is used to detect the resistance value of each circuit branch 100. The measurement module 3 can be a device capable of measuring resistance, such as a conductivity meter or a resistance meter. Of course, in other embodiments, the measurement module 3 can also be a current detection device or a voltage detection device. In actual use, the system parameter settings can be optimized as needed, such as the movement speed of the first conductive component 1 and / or the second conductive component 2, the sampling frequency of the measurement module 3, etc. By optimizing the system parameter settings, the detection efficiency can be improved and / or the detection error rate can be reduced.

[0086] like Figure 5 and Figure 6 As shown in FIG. 1 , as an embodiment, each conductive channel 11 on the first conductive component 1 can be electrically connected to the measurement module 3 via a wire 7 , and the wire 7 can be routed inside the conductive roller, for example. Figure 5 and Figure 7 As shown, as another embodiment, each conductive channel 11 on the first conductive component 1 can also be electrically connected to the measurement module 3 through a conductive spring 8 , and each pin 81 of the conductive spring 8 is crimped onto each conductive channel 11 .

[0087] like Figure 5As shown, as an embodiment, the membrane defect detection system also includes a data processing module 4, which is connected to the measurement module 3 (specifically, the data processing module 4 is electrically connected to the measurement module 3). The data processing module 4 can be specifically an arithmetic unit, an MCU (microcontroller unit), etc.; the data processing module 4 can be integrated into the measurement module 3, or it can be a separate module. The data processing module 4 is used to calculate the position of the defect of the membrane 6 in the first direction X and the second direction Y based on the movement distance of the circuit branch 100 relative to the membrane 6 in the first direction X and the position of the conductive channel 11 corresponding to the defect of the membrane 6 in the second direction Y when the measurement module 3 detects that the electrical characteristic parameters of the circuit branch 100 exceed the preset range, thereby accurately locating the defect of the membrane 6. Among them, comparing the electrical characteristic parameters of the circuit branch 100 detected by the measurement module 3 with the preset range can be completed by the measurement module 3, or by the data processing module 4, or by an additional comparison module (not shown).

[0088] Specifically, the preset ranges of the electrical characteristic parameters can be set based on actual needs and historical data. By continuously adjusting the preset ranges of the electrical characteristic parameters, detection accuracy can be improved or the detection range can be expanded. For example, the resistance value of the circuit branch 100 in the normal position of the membrane 6 can be set to a range of 10MΩ to 200MΩ. If the measurement module 3 detects that the resistance value of the circuit branch 100 is lower than the above range, for example, lower than 5MΩ, it indicates that the current position of the membrane 6 may be defective. To improve detection accuracy, multiple resistance value ranges can be set for different areas of the membrane 6 to meet various detection needs. Resistance testing can be performed using direct current or alternating current.

[0089] During the inspection process, after the first conductive component 1 and / or the second conductive component 2 move a certain distance in the first direction X, if the measurement module 3 detects that the resistance value of a certain circuit branch 100 is lower than a preset range, the data processing module 4 calculates the position of the defect in the film 6 in the first direction X based on the movement distance of the first conductive component 1 and / or the second conductive component 2 in the first direction X. Specifically, the movement distance of the conductive roller in the first direction X can be calculated based on the rolling angular velocity and rolling time of the conductive roller, or the movement distance of the conductive pad in the first direction X can be calculated based on the moving speed and moving time of the conductive pad.

[0090] At the same time, the data processing module 4 calculates the location of the defects in the film 6 in the second direction Y based on the locations of the conductive channels 11 corresponding to the defects in the film 6 (i.e., the conductive channels 11 having a resistance value below a preset range) in the second direction Y. Specifically, the multiple conductive channels 11 on the first conductive component 1 can be numbered, and the locations of the defects in the film 6 in the second direction Y can be obtained based on the numbers of the conductive channels 11 corresponding to the defects in the film 6. In this process, the location and number of defects in the film 6 can be accurately detected in real time.

[0091] For example, Figure 1 and Figure 8 As shown, the multiple conductive channels 11 on the first conductive component 1 are numbered 1 to 18. Figure 8 Figure 3 is a schematic diagram of the resistance test results for conductive channel 11 No. 3. After the conductive roller rolls a certain distance in the first direction X, the measurement module 3 detects that the resistance value of conductive channel 11 No. 3 is below a preset range. The data processing module 4 then calculates the position of the defect in film 6 in the first direction X based on the distance the conductive roller has moved in the first direction X, and calculates the position of the defect in film 6 in the second direction Y based on the position of conductive channel 11 No. 3 in the second direction Y.

[0092] At the same time, based on the magnitude and changing trends of the resistance data detected by the measurement module 3, the nature of the defect, such as its size, shape, and type, can be further determined. For example, defects in the film 6 can be classified as small, medium, and large, or as penetrating, crack, and porosity defects. The classification results can be used for subsequent quality control and product optimization. This step can be performed using automated equipment or manually.

[0093] For areas on the film 6 that are determined to be defective, manual inspection can be performed to further confirm the existence and nature of the defects. This step can be completed by observation, touch or other professional inspection methods.

[0094] In order to improve the detection accuracy and intuitiveness, image processing technology can be used to visualize the defects of the film 6, for example, by directly marking the defect position on the film 6 or using professional software to generate a defect distribution map.

[0095] As an implementation mode, the film 6 needs to be pre-treated before being tested to ensure that the surface of the film 6 is flat. Specifically, the film 6 can be flattened using equipment such as a flattening machine.

[0096] The present invention also provides a film defect detection method for use in the above-mentioned film defect detection system. The film defect detection method includes:

[0097] S10: A first conductive component 1 and a second conductive component 2 are respectively provided on opposite sides of the film 6, wherein the first conductive component 1 is provided with a conductive channel 11; the two sides of the film 6 are respectively in contact with the conductive channel 11 and the second conductive component 2 to form a circuit branch 100;

[0098] S20: moving the circuit branch 100 relative to the film 6 along the first direction X, and detecting the electrical characteristic parameters of the circuit branch 100 in real time;

[0099] S30: comparing the electrical characteristic parameter detected in real time with a preset range; when the electrical characteristic parameter exceeds the preset range, it is determined that there is a defect on the film 6.

[0100] As an embodiment, in the above step S20 , the first conductive component 1 and / or the second conductive component 2 is driven to move along the first direction X relative to the membrane 6 , so that the circuit branch 100 moves along the first direction X relative to the membrane 6 .

[0101] As an embodiment, the first conductive component 1 includes a conductive roller extending along the second direction Y, and the conductive channel 11 is provided on the outer peripheral surface of the conductive roller; the second conductive component 2 includes a conductive pad for carrying the film 6;

[0102] In the above step S10, one side of the film 6 is laid flat on the conductive pad, and the conductive roller is placed on the other side of the film 6 opposite to the conductive pad with a preset pressure;

[0103] In the above step S20 , the conductive roller is driven to roll on the film 6 along the first direction X; and / or the conductive pad is driven to move along the first direction X to drive the film 6 to move along the first direction X.

[0104] As another embodiment, the first conductive component 1 includes a first conductive roller extending along the second direction Y, and the conductive channel 11 is provided on the outer peripheral surface of the first conductive roller; the second conductive component 2 includes a second conductive roller extending along the second direction Y;

[0105] In the above step S10, the film 6 is sandwiched between the first conductive roller and the second conductive roller, so that both sides of the film 6 are in contact with the first conductive roller and the second conductive roller respectively;

[0106] In the above step S20 , the first conductive roller and the second conductive roller are driven to roll along the first direction X relative to the film 6 at the same time.

[0107] As an embodiment, in the above step S20 , the measuring module 3 is electrically connected to each conductive channel 11 on the second conductive component 2 and the first conductive component 1 , respectively, and the measuring module 3 is used to detect the electrical characteristic parameters of each circuit branch 100 in real time.

[0108] As an embodiment, in the above step S30, when the electrical characteristic parameter detected in real time exceeds the preset range, the position of the defect of the membrane 6 in the first direction X is also calculated based on the movement distance of the circuit branch 100 relative to the membrane 6 in the first direction X.

[0109] As an embodiment, a plurality of conductive channels 11 are provided on the first conductive component 1 , and the plurality of conductive channels 11 are spaced apart along the second direction Y, and adjacent conductive channels 11 are electrically insulated;

[0110] In the above step S10, a circuit branch 100 is formed between each conductive channel 11, the film 6 and the second conductive component 2;

[0111] In the above step S30, when the electrical characteristic parameters detected in real time exceed the preset range, the position of the defect of the film 6 in the second direction Y is also calculated based on the position of the conductive channel 11 corresponding to the defect of the film 6 in the second direction Y; wherein the second direction Y is perpendicular to the first direction X.

[0112] As an embodiment, in the above step S30, the method for obtaining the position of the conductive path 11 corresponding to the defect of the film 6 in the second direction Y specifically includes:

[0113] The plurality of conductive channels 11 on the first conductive component 1 are numbered in sequence, and the positions of the conductive channels 11 corresponding to the defects of the film 6 in the second direction Y are calculated according to the numbers of the conductive channels 11 corresponding to the defects of the film 6 .

[0114] As an embodiment, on the first conductive component 1 , an insulating portion 12 is provided between adjacent conductive channels 11 ;

[0115] In the above step S10, at least two first conductive components 1 are provided on one side of the film 6, and the at least two first conductive components 1 are arranged along the first direction X; among each two adjacent first conductive components 1, each conductive channel 11 on one first conductive component 1 corresponds to each insulating portion 12 on the other first conductive component 1;

[0116] In the above step S30, the method for obtaining the position of the conductive path 11 corresponding to the defect of the film 6 in the second direction Y specifically includes:

[0117] The multiple conductive channels 11 on each first conductive component 1 are numbered, and the positions of the conductive channels 11 corresponding to the defects of the film 6 in the second direction Y are calculated based on the numbers of the conductive channels 11 corresponding to the defects of the film 6 .

[0118] As an embodiment, in the above-mentioned step S30, the data processing module 4 is connected to the measurement module 3; when the electrical characteristic parameters detected in real time by the measurement module 3 exceed the preset range, the data processing module 4 is used to calculate the position of the defect of the film 6 in the first direction X and the second direction Y.

[0119] As an embodiment, in the above step S30, the electrical characteristic parameters detected in real time are compared with the preset range, which can be completed by the measurement module 3, or by the data processing module 4, or by setting up an additional comparison module.

[0120] The membrane defect detection system and method provided by the embodiment of the present invention accurately obtains the location of the defect of the membrane 6 by cooperating with the first conductive component 1 and the second conductive component 2. Compared with the traditional manual detection method, this application can avoid the problems of missed detection and misjudgment caused by human visual fatigue and subjective consciousness, and detect the defects of the membrane 6 with high precision and high efficiency, which is conducive to improving the safety and stability of the battery and ensuring the quality of the finished battery. Compared with the traditional automatic detection method based on image processing, this application can avoid the influence of factors such as uneven lighting, shadows, and reflections, and ensure the accuracy and stability of detection. At the same time, the membrane defect detection system has high detection efficiency, simple structure, easy operation, and low cost.

[0121] Second embodiment

[0122] like Figures 10 to 14 As shown, the film defect detection system provided by the second embodiment of the present invention is substantially the same as that of the first embodiment, with the main difference being that the detection method and detection components for the position of the defect of the film 6 in the second direction Y are different.

[0123] Specifically, in this embodiment, the film defect detection system includes a first conductive component 1 and a second conductive component 2, which are respectively arranged on opposite sides of a film 6. The first conductive component 1 is provided with a conductive path 11; during detection, when the first conductive component 1 and the second conductive component 2 are respectively arranged on opposite sides of the film 6, the two sides of the film 6 can contact the conductive path 11 and the second conductive component 2 respectively, so that a circuit branch 100 can be formed between the conductive path 11, the film 6 and the second conductive component 2 (because the circuit branch 100 is invisible to the naked eye, it is not visible in the naked eye). Figure 12 The circuit branch 100 is indicated by a dotted line in FIG. 1 . The circuit branch 100 can move relative to the film 6 along a first direction X, so that defects on the film 6 can be determined based on changes in electrical characteristic parameters of the circuit branch 100 .

[0124] The film defect detection system also includes a defect detection device 5, which can identify defects in the film 6; the defect detection device 5 is used to locate the position of the defect of the film 6 in the second direction Y, thereby obtaining the position of the defect of the film 6 in the second direction Y; wherein the second direction Y is perpendicular to the first direction X.

[0125] The membrane defect detection system provided by the embodiment of the present invention is provided with a first conductive component 1 and a second conductive component 2, and a circuit branch 100 is formed between the conductive channel 11 on the first conductive component 1, the membrane 6 and the second conductive component 2. The circuit branch 100 can move relative to the membrane 6 along the first direction X; because the electrical characteristic parameters of the circuit branch 100 are different at the defective position of the membrane 6 and the non-defective position of the membrane 6, during the movement of the circuit branch 100 relative to the membrane 6, the electrical characteristic parameters of the circuit branch 100 are detected in real time. When it is detected that the electrical characteristic parameters of the circuit branch 100 exceed the preset range, it can be By determining whether a defect exists at a corresponding position on the membrane 6, it is possible to quickly determine whether the membrane 6 has a defect, thereby ensuring the accuracy of membrane defect detection, improving the safety and stability of the battery, and guaranteeing the quality of the finished battery. Moreover, when the electrical characteristic parameters of the circuit branch 100 detected in real time exceed a preset range, the position of the defect in the membrane 6 in the first direction X can be calculated based on the movement distance of the circuit branch 100 relative to the membrane 6 in the first direction X. The defect in the membrane 6 can then be accurately identified using the defect detection device 5 to obtain the position of the defect in the second direction Y of the membrane 6. This allows the precise location of the defect in the membrane 6 to be determined. This membrane defect detection system has the advantages of high detection efficiency, simple structure, easy operation, and low cost.

[0126] like Figure 10 and Figure 12 As shown, as an embodiment, the first conductive component 1 and / or the second conductive component 2 can move along the first direction X relative to the membrane 6, so that the circuit branch 100 moves along the first direction X relative to the membrane 6.

[0127] like Figure 12 As shown, as an embodiment, the defect detection device 5 is a photoelectric detection device that can detect defects of the identification film 6 through optical signals (the specific principle of the photoelectric detection device can be referred to the prior art). The photoelectric detection device 5 can specifically be a CCD (Charge-coupled Device) photoelectric probe, etc.

[0128] like Figures 10 to 12 As shown, as an embodiment, the defect detection device 5 can be moved relative to the film 6 along the second direction Y to locate the position of the defect of the film 6 in the second direction Y.

[0129] Specifically, during the movement of the first conductive component 1 and / or the second conductive component 2 relative to the membrane 6, when it is detected that the electrical characteristic parameters of the circuit branch 100 have changed and exceeded the preset range, the position of the defect of the membrane 6 in the first direction X is calculated based on the movement distance of the circuit branch 100 relative to the membrane 6 in the first direction X, and the defect detection device 5 is driven to move along the second direction Y. The defect of the membrane 6 is identified by the defect detection device 5, and the position of the defect of the membrane 6 in the second direction Y is calculated based on the movement distance of the defect detection device 5 in the second direction Y (for example, the distance between the initial position of the defect detection device 5 and the position when the defect detection device 5 identifies the defect of the membrane 6). The position of the defect of the membrane 6 in the second direction Y can be accurately obtained.

[0130] As an embodiment, the film defect detection system also includes a third drive device (not shown), which is connected to the defect detection device 5 and is used to drive the defect detection device 5 to move along the second direction Y. The third drive device can be a motor or a pneumatic device, etc.

[0131] like Figures 10 to 12 As shown, as an embodiment, the first conductive component 1 and the second conductive component 2 are in contact with the surfaces on opposite sides of the membrane 6 respectively. At the same time, at least one of the first conductive component 1 and the second conductive component 2 applies pressure to the membrane 6 during the movement, so that the first conductive component 1 and the second conductive component 2 can be in close contact with the surface of the membrane 6, that is, there is no gap between the first conductive component 1 and the second conductive component 2 and the surface of the membrane 6, so that a stable circuit branch 100 can be formed between the conductive channel 11, the membrane 6 and the second conductive component 2, and the circuit branch 100 can be conductive at the defective position of the membrane 6.

[0132] like Figures 10 to 12 As shown, as an embodiment, along the second direction Y, the size of the first conductive component 1 and the size of the second conductive component 2 are both greater than or equal to the size of the membrane 6, so that the detection range of the first conductive component 1 and the second conductive component 2 can completely cover the membrane 6.

[0133] like Figures 10 to 12 As shown, as an embodiment, along the first direction X, the size of the second conductive component 2 is greater than or equal to the size of the film 6 , and the size of the first conductive component 1 is smaller than the size of the film 6 .

[0134] like Figures 10 to 13 As shown, as an embodiment, the conductive channel 11 covers the entire outer circumference of the first conductive component 1 for contacting the membrane 6 (i.e., the entire outer circumference of the first conductive component 1 is conductive). Of course, in other embodiments, the entire first conductive component 1 may also be a conductor.

[0135] Combine Figure 4 and Figure 10 As another embodiment, the first conductive component 1 is provided with a plurality of conductive channels 11. The plurality of conductive channels 11 are spaced apart along the second direction Y. Adjacent conductive channels 11 are electrically insulated from each other. A circuit branch 100 is formed between each conductive channel 11, the film 6, and the second conductive component 2. The details of the first conductive component 1 with this structure can be found in the first embodiment and are not described here in detail.

[0136] Specifically, when the first conductive component 1 adopts a structure of multiple conductive channels 11, if it is detected that the electrical characteristic parameters of the circuit branch 100 exceed the preset range, the number of the conductive channel 11 on the first conductive component 1 can be used to preliminarily determine the position of the defect of the film 6 in the second direction Y (the principle can be referred to the first embodiment and will not be repeated here), and then the defect detection device 5 can be used to accurately locate the position of the defect of the film 6 in the second direction Y (the width of the conductive channel 11 in the second embodiment can be greater than or equal to the width of the conductive channel 11 in the first embodiment. In this way, the defect detection device 5 can be used to improve the accuracy of locating the defect of the film 6), thereby improving the detection efficiency and accuracy.

[0137] like Figures 10 to 13 As shown, as one embodiment, the first conductive component 1 includes a conductive roller extending in a second direction Y, with a conductive channel 11 disposed on the outer circumference of the conductive roller. The second conductive component 2 includes a conductive pad for supporting the film 6, with the conductive roller positioned above the conductive pad. The conductive roller can roll on the film 6 in a first direction X; and / or the conductive pad can move in the first direction X, driving the film 6 in the first direction X. During use, the film 6 is laid flat on the conductive pad, ensuring that it is wrinkle-free. The conductive roller is then placed on the film 6 with the required pressure, ensuring that the conductive roller and the conductive pad are in close contact with the film 6, thereby forming a stable circuit branch 100.

[0138] Specifically, in this embodiment, the conductive pad can move along the first direction X, and drive the membrane 6 to move along the first direction X (specifically, as shown in FIG. Figure 12 As shown, in this embodiment, the conductive pad can move rightward in the direction indicated by arrow S2, while the conductive roller does not move in the first direction X (the conductive roller only rolls, not moves). In this case, a second drive device can be provided to drive the conductive pad to move in the first direction X. The second drive device can be, for example, a conveyor belt. That is, during use, the conductive pad can be placed on the conveyor belt, which drives the conductive pad to move. This arrangement eliminates the need for the conductive roller and the defect detection device 5 to move in the first direction X.

[0139] In other embodiments, the conductive roller may be capable of rolling on the film 6 along the first direction X, while the conductive pad and the film 6 remain stationary. In this case, the defect detection device 5 generally needs to move along with the conductive roller along the first direction X. In this case, a first drive device may be provided to drive the conductive roller to roll on the film 6 at a constant speed to ensure that the conductive roller can evenly apply pressure to the film 6 during the rolling process. The first drive device may be a motor or a pneumatic device.

[0140] In other embodiments, the conductive roller may roll on the film 6 along the first direction X, and the conductive pad may move along the first direction X. For example, the conductive roller and the conductive pad move relative to each other in opposite directions.

[0141] Of course, in other embodiments, the first conductive component 1 and / or the second conductive component 2 may also have other structural forms. For example, the first conductive component 1 and the second conductive component 2 may both be conductive rollers. Specifically, the first conductive component 1 includes a first conductive roller extending along the second direction Y, with the conductive channel 11 provided on the outer circumferential surface of the first conductive roller; the second conductive component 2 includes a second conductive roller extending along the second direction Y; the first conductive roller and the second conductive roller are capable of simultaneously rolling relative to the film 6 along the first direction X to maintain vertical alignment of the first and second conductive rollers.

[0142] like Figures 10 to 13 As shown in the figure, as an embodiment, the roller body 10 of the conductive roller is cylindrical and can be an insulator, conductor, or semiconductor. The roller body 10 can be solid or hollow (i.e., tubular). The conductive channel 11 is a conductive material disposed on the surface of the conductive roller. The conductive material can be a conductive film, a conductive layer, a conductive metal ring, or other structures. The conductive material can be fixed to the surface of the conductive roller by sleeves, bonding, or other methods, or formed on the surface of the conductive roller by coating, etching, electroplating, or other methods.

[0143] The conductive channel 11 is an annular structure that surrounds the circumference of the conductive roller and covers the entire outer surface of the conductive roller. As a result, the conductive channel 11 on the surface of the conductive roller is always in contact with the surface of the membrane 6 during the rolling process, thereby ensuring the accuracy of the detection results.

[0144] As an implementation method, the conductive pad has excellent electrical conductivity and pressure resistance, and the conductive pad can be a stainless steel pad or a copper pad.

[0145] like Figure 12As shown, as an embodiment, the first conductive component 1 can move relative to the film 6 along the first direction X, and the second conductive component 2 does not move relative to the film 6. The defect detection device 5 and the first conductive component 1 are located on the same side of the film 6 (in this embodiment, the defect detection device 5 and the first conductive component 1 are both located above the film 6, and the second conductive component 2 is located below the film 6). Along the moving direction of the first conductive component 1 relative to the film 6 (the moving direction of the first conductive component 1 relative to the film 6 is also Figure 12 In the embodiment of the present invention, the defect detection device 5 is located upstream of the first conductive component 1 (i.e., the first conductive component 1 is located in front of the defect detection device 5, so that defects in the film 6 can first pass through the first conductive component 1 and then through the defect detection device 5). The defect detection device 5 and the first conductive component 1 can be spaced apart in the first direction X and move independently, or they can be mounted on the same bracket and move synchronously. This arrangement enables the defect detection device 5 to move along the second direction Y to identify defects in the film 6 after the first conductive component 1 detects and identifies defects in the film 6.

[0146] In one embodiment, neither the first conductive component 1 nor the defect detection device 5 moves in the first direction X, and the second conductive component 2 can move in the first direction X and drive the film 6 to move in the first direction X, so that the first conductive component 1 and the defect detection device 5 move relative to the film 6 in the first direction X. In another embodiment, the first conductive component 1 and the defect detection device 5 can move synchronously relative to the film 6 in the first direction X, and in this case, the second conductive component 2 does not move in the first direction X (or, the second conductive component 2 and the first conductive component 1 move in opposite directions).

[0147] like Figure 14 As shown, as an embodiment, the film defect detection system further includes a measurement module 3, which is electrically connected to the second conductive component 2 and the conductive channel 11 on the first conductive component 1. The measurement module 3 is used to detect the electrical characteristic parameters of the circuit branch 100 and is also capable of recording the measured data. The measurement module 3 and the conductive channel 11 on the first conductive component 1 can be electrically connected via a wire or a conductive spring (the specific connection structure can be referred to in the first embodiment and is not repeated here).

[0148] Specifically, in this embodiment, the measuring module 3 is used to detect the resistance value of the circuit branch 100. The measuring module 3 can be a device capable of measuring resistance value, such as a conductivity meter or a resistance meter. Of course, in other embodiments, the measuring module 3 can also be a current detection device or a voltage detection device.

[0149] like Figure 14As shown, as an embodiment, the membrane defect detection system also includes a data processing module 4, which is connected to the measurement module 3 (specifically, the data processing module 4 is electrically connected to the measurement module 3). The data processing module 4 can be specifically an arithmetic unit, an MCU, etc.; the data processing module 4 can be integrated in the measurement module 3, or it can be a separate module. The data processing module 4 is used to calculate the position of the defect of the membrane 6 in the first direction X and the second direction Y according to the movement distance of the circuit branch 100 relative to the membrane 6 in the first direction X and the movement distance of the defect detection device 5 in the second direction Y when the measurement module 3 detects that the electrical characteristic parameters of the circuit branch 100 exceed the preset range, thereby accurately locating the defect of the membrane 6. Among them, comparing the electrical characteristic parameters of the circuit branch 100 detected by the measurement module 3 with the preset range can be completed by the measurement module 3, can be completed by the data processing module 4, or can be completed by an additional comparison module.

[0150] Specifically, the preset ranges of the electrical characteristic parameters can be set based on actual needs and historical data. By continuously adjusting the preset ranges of the electrical characteristic parameters, detection accuracy can be improved or the detection range can be expanded. For example, the resistance value of the circuit branch 100 in the normal position of the membrane 6 can be set to a range of 10MΩ to 200MΩ. If the measurement module 3 detects that the resistance value of the circuit branch 100 is lower than the above range, for example, lower than 5MΩ, it indicates that the current position of the membrane 6 may be defective. To improve detection accuracy, multiple resistance value ranges can be set for different areas of the membrane 6 to meet various detection needs. Resistance testing can be performed using direct current or alternating current.

[0151] During the inspection process, after the first conductive component 1 and / or the second conductive component 2 move a certain distance in the first direction X, if the measurement module 3 detects that the resistance value of the circuit branch 100 is lower than a preset range, the data processing module 4 calculates the position of the defect in the film 6 in the first direction X based on the movement distance of the first conductive component 1 and / or the second conductive component 2 in the first direction X. Specifically, the movement distance of the conductive roller in the first direction X can be calculated based on the rolling angular velocity and rolling time of the conductive roller, or the movement distance of the conductive pad in the first direction X can be calculated based on the moving speed and moving time of the conductive pad.

[0152] At the same time, after the position of the defect in film 6 in the first direction X is determined, the defect position of film 6 is moved to the defect detection device 5, and the movement of the first conductive component 1 and / or the second conductive component 2 in the first direction X is stopped. The defect detection device 5 is then driven to move in the second direction Y. The defect in film 6 is identified by the defect detection device 5, and the data processing module 4 calculates the position of the defect in film 6 in the second direction Y based on the movement distance of the defect detection device 5 in the second direction Y. Specifically, the movement distance of the defect detection device 5 in the second direction Y can be calculated based on the movement speed and movement time of the defect detection device 5. In this process, the location and number of defects in film 6 can be accurately detected in real time.

[0153] For example, Figure 12 and Figure 15 As shown, after the conductive pad moves a certain distance in the first direction X, the measurement module 3 detects that the resistance value of the circuit branch 100 is lower than a preset range. The data processing module 4 then calculates the position of the defect in the film 6 in the first direction X based on the distance the conductive pad has moved in the first direction X. After the defect in the film 6 has moved to the defect detection device 5, the conductive pad stops moving in the first direction X and then drives the defect detection device 5 to move in the second direction Y. The defect in the film 6 is accurately identified by the defect detection device 5. The data processing module 4 then calculates the position of the defect in the film 6 in the second direction Y based on the distance the defect detection device 5 has moved in the second direction Y.

[0154] At the same time, based on the magnitude and changing trends of the resistance data detected by the measurement module 3, the nature of the defect, such as its size, shape, and type, can be further determined. For example, defects in the film 6 can be classified as small, medium, and large, or as penetrating, crack, and porosity defects. The classification results can be used for subsequent quality control and product optimization. This step can be performed using automated equipment or manually.

[0155] For areas on the film 6 that are determined to be defective, manual inspection can be performed to further confirm the existence and nature of the defects. This step can be completed by observation, touch or other professional inspection methods.

[0156] In order to improve the detection accuracy and intuitiveness, image processing technology can be used to visualize the defects of the film 6, for example, by directly marking the defect position on the film 6 or using professional software to generate a defect distribution map.

[0157] As an implementation mode, the film 6 needs to be pre-treated before being tested to ensure that the surface of the film 6 is flat. Specifically, the film 6 can be flattened using equipment such as a flattening machine.

[0158] The present invention also provides a film defect detection method for use in the above-mentioned film defect detection system. The film defect detection method includes:

[0159] S10: A first conductive component 1 and a second conductive component 2 are respectively provided on opposite sides of the film 6, wherein the first conductive component 1 is provided with a conductive channel 11; the two sides of the film 6 are respectively in contact with the conductive channel 11 and the second conductive component 2 to form a circuit branch 100;

[0160] S20: moving the circuit branch 100 relative to the film 6 along the first direction X, and detecting the electrical characteristic parameters of the circuit branch 100 in real time;

[0161] S30: comparing the electrical characteristic parameter detected in real time with a preset range; when the electrical characteristic parameter exceeds the preset range, it is determined that there is a defect on the film 6.

[0162] As an embodiment, in the above step S20 , the first conductive component 1 and / or the second conductive component 2 is driven to move along the first direction X relative to the membrane 6 , so that the circuit branch 100 moves along the first direction X relative to the membrane 6 .

[0163] As an embodiment, the first conductive component 1 includes a conductive roller extending along the second direction Y, and the conductive channel 11 is provided on the outer peripheral surface of the conductive roller; the second conductive component 2 includes a conductive pad for carrying the film 6;

[0164] In the above step S10, one side of the film 6 is laid flat on the conductive pad, and the conductive roller is placed on the other side of the film 6 opposite to the conductive pad with a preset pressure;

[0165] In the above step S20 , the conductive roller is driven to roll on the film 6 along the first direction X; and / or the conductive pad is driven to move along the first direction X to drive the film 6 to move along the first direction X.

[0166] As another embodiment, the first conductive component 1 includes a first conductive roller extending along the second direction Y, and the conductive channel 11 is provided on the outer peripheral surface of the first conductive roller; the second conductive component 2 includes a second conductive roller extending along the second direction Y;

[0167] In the above step S10, the film 6 is sandwiched between the first conductive roller and the second conductive roller, so that both sides of the film 6 are in contact with the first conductive roller and the second conductive roller respectively;

[0168] In the above step S20 , the first conductive roller and the second conductive roller are driven to roll along the first direction X relative to the film 6 at the same time.

[0169] As an embodiment, in the above step S20 , the measuring module 3 is electrically connected to the second conductive component 2 and the conductive channel 11 on the first conductive component 1 , respectively, and the measuring module 3 is used to detect the electrical characteristic parameters of the circuit branch 100 in real time.

[0170] As an embodiment, in the above step S30, when the electrical characteristic parameter detected in real time exceeds the preset range, the position of the defect of the membrane 6 in the first direction X is also calculated based on the movement distance of the circuit branch 100 relative to the membrane 6 in the first direction X.

[0171] As an embodiment, in the above-mentioned step S30, when the electrical characteristic parameters detected in real time exceed the preset range, the defect detection device 5 is also used to identify the defects of the film 6 to locate the position of the defects of the film 6 in the second direction Y; wherein the second direction Y is perpendicular to the first direction X.

[0172] As an embodiment, the defect detection device 5 is movable relative to the film 6 along the second direction Y;

[0173] In the above-mentioned step S30, when the electrical characteristic parameters detected in real time exceed the preset range, the defect detection device 5 is moved relative to the film 6 along the second direction Y, and the defect of the film 6 is identified by the defect detection device 5. According to the moving distance of the defect detection device 5 in the second direction Y, the position of the defect of the film 6 in the second direction Y is calculated.

[0174] In one embodiment, the defect detection device 5 and the first conductive component 1 are located on the same side of the film 6; the first conductive component 1 is movable relative to the film 6 in a first direction X, and the defect detection device 5 is located upstream of the first conductive component 1 in the direction of movement of the first conductive component 1 relative to the film 6;

[0175] In the above step S20, the first conductive component 1 is driven to move relative to the film 6 along the first direction X, so that the circuit branch 100 moves relative to the film 6 along the first direction X;

[0176] In the above-mentioned step S30, when the electrical characteristic parameter detected in real time exceeds the preset range, after calculating the position of the defect of the film 6 in the first direction X, the first conductive component 1 is continued to be driven to move relative to the film 6 along the first direction X until the position of the defect of the film 6 corresponds to the position of the defect detection device 5 in the first direction X, and then the first conductive component 1 is stopped from moving relative to the film 6 along the first direction X; and then the defect detection device 5 is driven to move relative to the film 6 along the second direction Y to locate the position of the defect of the film 6 in the second direction Y.

[0177] Specifically, for example, Figure 12As shown, the defect detection device 5 is located to the right of the conductive roller (i.e., the first conductive component 1). During the inspection process, the conductive pad (i.e., the second conductive component 2) moves rightward in the direction indicated by the arrow S2, driving the film 6 to move rightward. After the conductive pad moves a certain distance, if the measurement module 3 detects that the resistance value of a certain position on the film 6 is lower than the preset range, it is determined that there is a defect on the film 6, and the position of the defect in the film 6 in the first direction X is calculated based on the movement distance of the conductive pad. After calculating the position of the defect in the film 6 in the first direction X, the conductive pad continues to be driven to the right until the position of the defect in the film 6 moves to the defect detection device 5, and the conductive pad stops moving to the right. Then, the defect detection device 5 is driven to move relative to the film 6 in the second direction Y, and the position of the defect in the film 6 in the second direction Y is calculated based on the movement distance of the defect detection device 5 in the second direction Y. After the calculation is completed, the conductive pad continues to be driven to the right until the entire film 6 is inspected.

[0178] As an embodiment, the defect detection device 5 and the first conductive component 1 are capable of synchronously moving along the first direction X relative to the film 6;

[0179] In the above step S20, the first conductive component 1 and the defect detection device 5 are driven to move synchronously along the first direction X relative to the film 6;

[0180] In the above-mentioned step S30, when the electrical characteristic parameter detected in real time exceeds the preset range, after calculating the position of the defect of the film 6 in the first direction X, the first conductive component 1 and the defect detection device 5 are continued to be driven to move synchronously relative to the film 6 along the first direction X until the position of the defect of the film 6 corresponds to the position of the defect detection device 5 in the first direction X, and then the first conductive component 1 and the defect detection device 5 are stopped from moving relative to the film 6 along the first direction X; and then the defect detection device 5 is driven to move relative to the film 6 along the second direction Y to locate the position of the defect of the film 6 in the second direction Y.

[0181] As an embodiment, a plurality of conductive channels 11 are provided on the first conductive component 1 , and the plurality of conductive channels 11 are spaced apart along the second direction Y, and adjacent conductive channels 11 are electrically insulated;

[0182] In the above step S10, after the first conductive component 1 and the second conductive component 2 are respectively provided on opposite sides of the film 6, circuit branches 100 are respectively formed between each conductive channel 11, the film 6 and the second conductive component 2;

[0183] In step S30 above, when the electrical characteristic parameter detected in real time exceeds a preset range, the position of the defect in the film 6 in the second direction Y is preliminarily determined based on the position of the conductive path 11 corresponding to the defect in the film 6 in the second direction Y (the specific method can be referred to in the first embodiment and will not be repeated here). Then, the defect detection device 5 is used to identify the defect in the film 6 to accurately locate the position of the defect in the second direction Y. This arrangement can further improve detection efficiency and accuracy.

[0184] As an embodiment, in the above-mentioned step S30, the data processing module 4 is connected to the measurement module 3; when the electrical characteristic parameters detected in real time by the measurement module 3 exceed the preset range, the data processing module 4 is used to calculate the position of the defect of the film 6 in the first direction X and the second direction Y.

[0185] As an embodiment, in the above step S30, the electrical characteristic parameters detected in real time are compared with the preset range, which can be completed by the measurement module 3, or by the data processing module 4, or by setting up an additional comparison module.

[0186] Other structures and functions of this embodiment are the same as or similar to those of the first embodiment and are not described in detail here.

[0187] The membrane defect detection system and method provided by the embodiment of the present utility model accurately obtains the location of the defect of the membrane 6 by cooperating with the first conductive component 1, the second conductive component 2 and the defect detection device 5. Compared with the traditional manual detection method, the present application can avoid the problems of missed detection and misjudgment caused by human visual fatigue and subjective consciousness, and detect the defects of the membrane 6 with high precision and high efficiency, which is conducive to improving the safety and stability of the battery and ensuring the quality of the finished battery. Compared with the traditional automatic detection method based on image processing, the present application can avoid the influence of factors such as uneven lighting, shadows, and reflections, and ensure the accuracy and stability of detection. At the same time, the membrane defect detection system has high detection efficiency, simple structure, easy operation, and low cost.

[0188] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A film defect detection system, characterized in that: It comprises a first conductive component (1) and a second conductive component (2), wherein the first conductive component (1) and the second conductive component (2) are respectively used to be arranged on opposite sides of a film (6); The first conductive component (1) is provided with a conductive channel (11); during detection, two surfaces of the film (6) can respectively contact the conductive channel (11) and the second conductive component (2) to form a circuit branch (100); The circuit branch (100) is capable of moving relative to the film (6) along a first direction (X) to determine defects on the film (6) based on changes in electrical characteristic parameters of the circuit branch (100).

2. The film defect detection system according to claim 1, wherein: The first conductive component (1) and / or the second conductive component (2) can move relative to the membrane (6) along the first direction (X), so that the circuit branch (100) moves relative to the membrane (6) along the first direction (X).

3. The film defect detection system according to claim 1, wherein: Also includes: A measuring module (3) is electrically connected to the second conductive component (2) and the conductive channel (11) on the first conductive component (1), respectively; the measuring module (3) is used to detect electrical characteristic parameters of the circuit branch (100).

4. The film defect detection system according to claim 1, wherein: The electrical characteristic parameter includes at least one of resistance, voltage and current.

5. The film defect detection system according to claim 1, wherein: A plurality of conductive channels (11) are provided on the first conductive component (1), the plurality of conductive channels (11) are spaced apart along a second direction (Y), adjacent conductive channels (11) are electrically insulated, and circuit branches (100) are formed between each conductive channel (11), the film (6) and the second conductive component (2); wherein the second direction (Y) is perpendicular to the first direction (X).

6. The film defect detection system according to claim 5, characterized in that: An insulating portion (12) is provided between adjacent conductive channels (11); the number of the first conductive components (1) is at least two, and at least two first conductive components (1) are arranged along the first direction (X); and in each of two adjacent first conductive components (1), each conductive channel (11) on one of the first conductive components (1) corresponds to each insulating portion (12) on the other first conductive component (1).

7. The film defect detection system according to claim 5, wherein: Also includes: A measuring module (3) is electrically connected to each conductive channel (11) on the second conductive component (2) and the first conductive component (1), respectively; the measuring module (3) is used to detect electrical characteristic parameters of each circuit branch (100).

8. The film defect detection system according to claim 7, wherein: Also includes: A data processing module (4) is connected to the measurement module (3); the data processing module (4) is used to calculate the position of the defect of the membrane (6) in the first direction (X) and the second direction (Y) based on the movement distance of the circuit branch (100) relative to the membrane (6) in the first direction (X) and the position of the conductive path (11) corresponding to the defect of the membrane (6) in the second direction (Y).

9. The film defect detection system according to claim 1, wherein: Also includes: a defect detection device (5) capable of identifying defects in the film (6); The defect detection device (5) is used to locate the position of the defect of the film (6) in a second direction (Y); wherein the second direction (Y) is perpendicular to the first direction (X).

10. The film defect detection system according to claim 9, wherein: The defect detection device (5) is a photoelectric detection device.

11. The film defect detection system according to claim 9, wherein: The defect detection device (5) and the first conductive component (1) are located on the same side of the film (6); the first conductive component (1) is capable of moving relative to the film (6) along the first direction (X), and along the moving direction of the first conductive component (1) relative to the film (6), the defect detection device (5) is located upstream of the first conductive component (1).

12. The film defect detection system according to claim 11, wherein: The defect detection device (5) and the first conductive component (1) are capable of synchronously moving relative to the film (6) along the first direction (X).

13. The film defect detection system according to claim 9, wherein: The defect detection device (5) is movable relative to the film (6) along the second direction (Y) to locate the position of the defect of the film (6) in the second direction (Y).

14. The film defect detection system according to claim 13, wherein: Also includes: A measuring module (3) is electrically connected to the second conductive component (2) and the conductive channel (11) on the first conductive component (1), respectively; the measuring module (3) is used to detect electrical characteristic parameters of the circuit branch (100); A data processing module (4) is connected to the measurement module (3); the data processing module (4) is used to calculate the position of the defect of the film (6) in the first direction (X) and the second direction (Y) based on the movement distance of the circuit branch (100) relative to the film (6) in the first direction (X) and the movement distance of the defect detection device (5) in the second direction (Y).

15. The film defect detection system according to any one of claims 1 to 14, characterized in that: The first conductive component (1) includes a conductive roller, and the conductive channel (11) is provided on the outer peripheral surface of the conductive roller; the second conductive component (2) includes a conductive pad for supporting the film (6); The conductive roller can roll on the film (6) along the first direction (X); and / or the conductive pad can move along the first direction (X) and drive the film (6) to move along the first direction (X).

16. The film defect detection system according to any one of claims 1 to 14, characterized in that: The first conductive component (1) includes a first conductive roller, and the conductive channel (11) is arranged on the outer peripheral surface of the first conductive roller; the second conductive component (2) includes a second conductive roller; the first conductive roller and the second conductive roller can simultaneously roll relative to the film (6) along the first direction (X).

17. The film defect detection system according to any one of claims 5 to 14, characterized in that: The first conductive component (1) and the second conductive component (2) are in contact with surfaces on opposite sides of the film (6) respectively; along the second direction (Y), the size of the first conductive component (1) and the size of the second conductive component (2) are both greater than or equal to the size of the film (6).

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