Detection system and detection method, winding equipment and lamination equipment

Abstract

The present application provides a detection system and detection method, winding equipment and lamination equipment, which belong to the field of substrate detection technology. The detection system is used to detect an insulating substrate, including a magnetic field generating device for generating a magnetic field. The magnetic field is formed on the conveying path of the insulating substrate tape. The magnetic field has a standard magnetic field strength, which is the magnetic field strength of the magnetic field when the insulating substrate does not pass through the magnetic field; the detection device is configured to detect the change in the magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field, so as to determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value. The detection system of the present application can improve the reliability of the use of insulating substrates.

Description

Technical Field

[0001] The present application relates to the technical field of substrate detection, and in particular to a detection system and detection method, a winding device and a lamination device. Background Art

[0002] Substrate refers to the basic material for the preparation of other materials or structures, and is the basis of various materials and electronic components. The reliability of the substrate directly affects the performance of other materials and electronic components. Especially for insulating substrates, due to the presence of impurity particles during the production and processing, the conductive particles in these impurity particles adhere to the insulating substrate, which will affect the performance of the insulating substrate.

[0003] For example, the insulating substrate can be a battery diaphragm, which is a layer of separation between the positive and negative electrodes of the battery. Its main function is to isolate the charge and prevent the positive and negative electrodes from directly contacting each other, thereby avoiding battery short circuit or runaway reaction. If there are conductive particles on the diaphragm, there may be a risk of piercing the diaphragm, thus causing a battery short circuit.

[0004] Therefore, how to improve the reliability of the use of insulating substrates is an urgent problem to be solved. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems in the background technology. To this end, one object of the present application is to provide a detection system and detection method, a winding device and a lamination device to improve the reliability of the use of the insulating substrate.

[0006] An embodiment of the first aspect of the present application provides a detection system for detecting an insulating substrate, comprising: a magnetic field generating device, for generating a magnetic field, the magnetic field being formed on a conveying path of the insulating substrate, the magnetic field having a standard magnetic field strength, the standard magnetic field strength being the magnetic field strength of the magnetic field when the insulating substrate has not passed through the magnetic field; a detection device, configured to detect a change in the magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field, so as to determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value.

[0007] In the technical solution of the embodiment of the present application, if there are conductive particles on the insulating substrate, when passing through the magnetic field, the conductive particles will cause changes in the magnetic field. Therefore, the detection device can accurately judge whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value based on the change in the magnetic field strength. Since the magnetic field is formed on the transmission path of the insulating substrate, it is possible to judge whether the volume of the conductive particles of the insulating substrate is greater than the preset value during the transmission of the insulating substrate. That is, it is possible to achieve early detection before the use of the insulating substrate, so as to achieve the purpose of early prevention, and to a certain extent reduce the problem of the insulating substrate affecting the reliability of use due to the excessive volume of the conductive particles during the subsequent preparation of other devices, etc., and greatly improve the stability of the insulating substrate during use. In addition, by detecting the change in the magnetic field strength to detect the insulating substrate, it is possible to achieve contactless detection during the transmission of the insulating substrate, which will not affect the normal transmission of the insulating substrate and can ensure the normal production rhythm.

[0008] In some embodiments, the detection device includes a magnetometer for detecting the magnetic field strength of the magnetic field. The magnetometer can accurately detect the magnetic field strength of the magnetic field to determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value based on the change value of the magnetic field strength.

[0009] In some embodiments, the detection device includes a magnetic field sensor, which is used to generate a detection signal based on the change in magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field, and the detection signal is used to characterize whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value. The magnetic field sensor can sense weak magnetic field changes, and can detect even changes in magnetic field strength caused by weakly magnetic conductive particles passing through the magnetic field, thereby improving the detection rate of the detection device detecting that the volume of the conductive particles on the insulating substrate is greater than the preset value.

[0010] In some embodiments, the detection system further includes: a magnetic shielding device, in which the magnetic field generating device and the detection device are located. The magnetic shielding device can shield the magnetic field in the external environment from interfering with the magnetic field generated by the magnetic field generating device, thereby improving the accuracy of the detection result.

[0011] In some embodiments, the detection system further includes: a measuring device, which is communicatively connected to the detection device and is configured to: measure the running length of the insulating substrate when the detection device detects that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value. That is, the measuring device can obtain the running length of the insulating substrate when the detection device detects that the volume of the conductive particles on the insulating substrate is greater than the preset value. Since the detection device performs detection on the transmission path of the insulating substrate, by obtaining the running length of the insulating substrate when the conductive particles are detected to be greater than the preset value, the conductive particles with a volume greater than the preset value can be located on the insulating substrate, thereby facilitating the staff to promptly process the conductive particles on the insulating substrate.

[0012] In some embodiments, the detection system further includes: a labeling machine, which is communicatively connected to the detection device, and is used for labeling the locations where the conductive particles whose volumes are greater than the preset value are located in response to the detection device detecting that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value. The labeling machine can label the locations where the conductive particles whose volumes are greater than the preset value are located in real time during the tape running of the insulating substrate, thereby achieving efficient positioning.

[0013] In some embodiments, the detection system further includes: a conveying mechanism for conveying the insulating substrate, wherein the magnetic field generated by the magnetic field generating device is formed on a conveying path of the insulating substrate by the conveying mechanism. In this way, when it is necessary to detect the conductive particles on the insulating substrate, the insulating substrate can be placed on the conveying mechanism, and during the conveying process of the insulating substrate, the magnetic field generating device and the detecting device can detect whether there are conductive particles with a volume greater than a preset value on the insulating substrate.

[0014] In some embodiments, the magnetic field generating device includes any one of a solenoid, an electromagnetic coil, and an electromagnet. Using these structures, a magnetic field with controllable magnetic field strength can be generated, which is conducive to adjusting the strength of the magnetic field itself according to different test requirements.

[0015] An embodiment of the second aspect of the present application provides a winding device, which includes: a winding device, which is configured to overlap a diaphragm, a positive electrode sheet and a negative electrode sheet and wind them into a winding structure, and at least one layer of diaphragm is arranged between the positive electrode sheet and the negative electrode sheet; a first conveying device, which is configured to convey the diaphragm, the positive electrode sheet and the negative electrode sheet to the winding device; the detection system in the above embodiment is configured to form a magnetic field on the conveying path of the diaphragm, and detect whether the volume of the conductive particles on the diaphragm passing through the magnetic field is greater than a preset value.

[0016] An embodiment of the third aspect of the present application provides a stacking device, which includes: a second conveying device, configured to be able to convey a diaphragm, a positive electrode sheet and a negative electrode sheet; the detection system in the above embodiment, configured to form a magnetic field on the conveying path of the diaphragm, and detect whether the volume of the conductive particles on the diaphragm passing through the magnetic field is greater than a preset value; a cutting device, configured to be able to receive and cut the positive electrode sheet and the negative electrode sheet conveyed by the second conveying device; a stacking device, the stacking device being configured to stack the cut positive electrode sheet, the diaphragm and the cut negative electrode sheet to form a stacking structure, with at least one layer of diaphragm arranged between the positive electrode sheets.

[0017] The fourth aspect of the present application provides a detection method, which includes: forming a magnetic field on the transmission path of the insulating substrate tape, the magnetic field has a standard magnetic field strength, and the standard magnetic field strength is the magnetic field strength of the magnetic field when the insulating substrate does not pass through the magnetic field; obtaining the change in magnetic field strength of the current magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field; based on the change in magnetic field strength, determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value. By forming a magnetic field on the transmission path of the insulating substrate, it is possible to perform contactless detection on whether there are conductive particles with a volume greater than a preset value on the insulating substrate during the transmission process, while ensuring a normal production rhythm, to achieve early detection before the use of the insulating substrate, greatly improving the reliability of the insulating substrate during subsequent use.

[0018] In some embodiments, obtaining the change in magnetic field strength includes: using a magnetometer to detect the standard magnetic field strength and the current magnetic field strength; and determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value includes: obtaining a first difference between the standard magnetic field strength and the current magnetic field strength; based on the first difference being greater than a preset first difference, determining that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value, the preset first difference being the first difference corresponding to when the volume of the conductive particles on the insulating substrate passing through the magnetic field is equal to the preset value. Conductive particles of different volumes will cause the magnetic field to change to different degrees when passing through the magnetic field. Therefore, by comparing the first difference between the current magnetic field strength and the standard magnetic field strength with the preset first difference, it is possible to accurately determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value.

[0019] In some embodiments, obtaining the change in magnetic field strength includes: using a magnetic sensor to detect the change in magnetic field strength of the current magnetic field strength compared to the standard magnetic field strength and generating a detection signal; and determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value includes: determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value based on the change value of the detection signal and the preset detection signal, the preset detection signal being the detection signal corresponding to when the volume of the conductive particles on the insulating substrate passing through the magnetic field is equal to the preset value. The magnetic sensor can sense weak magnetic field changes, and can detect even the change in magnetic field strength caused by weakly magnetic conductive particles passing through the magnetic field, thereby improving the detection rate of the detection device detecting that the volume of the conductive particles on the insulating substrate is greater than the preset value.

[0020] In some embodiments, the method further includes: in response to the volume of the conductive particles on the insulating substrate passing through the magnetic field being greater than a preset value, obtaining the position of the conductive particles with a volume greater than the preset value on the insulating substrate. The conductive particles with a volume greater than the preset value are located to facilitate timely processing by staff and improve production efficiency.

[0021] In some embodiments, obtaining the position of the conductive particles whose volume is greater than a preset value on the insulating substrate includes: selecting a reference position on the insulating substrate, the reference position having a first mapping position on the transmission path at the start of the tape running of the insulating substrate, and the first mapping position is separated from the magnetic field by a first distance along the transmission path; obtaining the tape running length of the insulating substrate at the moment when the volume of the conductive particles on the insulating substrate passing through the magnetic field is detected to be greater than a preset value; obtaining the position of the conductive particles whose volume is greater than the preset value on the insulating substrate based on the tape running length, the reference position and the first distance. By obtaining the tape running length of the insulating substrate at the moment when the conductive particles are detected to be greater than the preset value, the position of the conductive particles whose volume is greater than the preset value on the insulating substrate can be located, thereby facilitating the staff to promptly process the conductive particles on the insulating substrate.

[0022] In some embodiments, obtaining the position of the conductive particles whose volume is greater than a preset value on the insulating substrate includes: placing a labeling machine facing the conveying path of the insulating substrate, so that the insulating substrate passes through the magnetic field and the labeling machine in sequence, and the second mapping position of the labeling machine on the conveying path is separated from the magnetic field by a second distance; when it is detected that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value, controlling the labeling machine to label the position of the conductive particles whose volume is greater than the preset value based on the second distance and the conveying speed of the insulating substrate. The labeling machine can label the position of the conductive particles whose volume is greater than the preset value in real time during the conveying process of the insulating substrate, thereby achieving efficient positioning.

[0023] In some embodiments, the insulating substrate is a diaphragm, and a magnetic field is formed on the transmission path of the diaphragm feeding to the winding device, and the winding device is used to wind the positive electrode sheet, the negative electrode sheet and the diaphragm to form a winding structure. In this way, before the diaphragm is wound into a winding structure, whether the conductive particles on the diaphragm are greater than a preset value is detected in advance, which can greatly improve the reliability of the prepared winding structure, improve the yield of the prepared winding structure, and avoid the problem of short circuit during the use of the winding structure to a certain extent.

[0024] In some embodiments, a magnetic field is formed on the transmission path of the electrode assembly, the electrode assembly includes a diaphragm, and obtaining the change in magnetic field strength includes: obtaining the change in magnetic field strength of the current magnetic field strength of the magnetic field compared to the standard magnetic field strength when the electrode assembly passes through the magnetic field; and determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value based on the change in magnetic field strength includes: determining whether the volume of the conductive particles on the diaphragm of the electrode assembly passing through the magnetic field is greater than a preset value based on the change in magnetic field strength. In this way, after the preparation of the electrode assembly is completed, it is possible to detect whether the conductive particles on the diaphragm of the electrode assembly are greater than the preset value on the transmission path of the electrode assembly. On the one hand, it is possible to timely determine whether there is an abnormality in the process of preparing the electrode assembly based on the detection results, and on the other hand, it is conducive to further improving the reliability and stability of the electrode assembly during subsequent use.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0027] Figure 1 A schematic diagram of the structure of a detection system according to some embodiments of the present application;

[0028] Figure 2 This is a schematic diagram of the structure of a detection system detecting a diaphragm according to some embodiments of the present application;

[0029] Figure 3 It is a schematic diagram of the structure of the detection system of some other embodiments of the present application;

[0030] Figure 4 It is a structural schematic diagram of the detection system of some other embodiments of the present application;

[0031] Figure 5 A schematic diagram of the principle of obtaining the position of conductive particles whose volume is greater than a preset value on an insulating substrate in some embodiments of the present application;

[0032] Figure 6 A schematic diagram of the structure of a detection system in some further embodiments of the present application;

[0033] Figure 7 One of the flow charts of the detection method of some embodiments of the present application;

[0034] Figure 8 This is a second flow chart of the detection method of some embodiments of the present application;

[0035] Fig. 9 This is a third flow chart of the detection method of some embodiments of the present application;

[0036] Fig.10 This is a fourth flow chart of the detection method of some embodiments of the present application;

[0037] Fig.11 This is flowchart five of the detection method of some embodiments of the present application.

[0038] Description of reference numerals:

[0039] Reeling roller 1061, unreeling roller 1062;

[0040] Magnetic field generating device 101, detecting device 102, magnetic shielding device 103, encoder 104, labeling machine 105, conveying mechanism 106;

[0041] Insulating substrate 30;

[0042] Magnetic field 40, unwinding mechanism 41, winding device 42, transition roller 43;

[0043] A first separator 51 , a second separator 52 , a positive electrode sheet 53 , and a negative electrode sheet 54 . DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] During use, the insulating substrate usually needs to utilize its insulating properties to meet the needs of different structures. However, during the production and processing, foreign particles may adhere to the insulating substrate, and the conductive particles in these foreign particles will affect the performance of the insulating substrate.

[0053] Exemplarily, the diaphragm of the battery is an insulating material, and the diaphragm is located between the positive electrode sheet and the negative electrode sheet to prevent the positive electrode sheet and the negative electrode sheet from direct contact and avoid battery short circuit. However, during the processing of the battery, foreign particles may be present on the diaphragm. The source of these foreign particles may be attached during the incoming material step, or they may fall due to wear and tear of the equipment, or they may be impurities existing in the environment, or they may be accidentally brought in during the operation of the personnel. Among these foreign particles, there may be conductive particles. When the particle size of the conductive particles is large, it is easy to pierce the diaphragm. Due to the conductive properties of the conductive particles, it is easy to cause electrical contact between the positive electrode sheet and the negative electrode sheet, thereby causing the battery short circuit problem.

[0054] In the related art, in order to improve the reliability of battery use, the battery or the diaphragm is randomly inspected to detect whether the particle size or quantity of the conductive particles exceeds the standard. Alternatively, when the battery has abnormal self-discharge, the battery is disassembled and the diaphragm is manually inspected to determine whether there is a diaphragm puncture problem. This not only leads to low detection efficiency, but also low detection rate, which makes the reliability of diaphragm use still low.

[0055] Based on the above considerations, an embodiment of the present application provides a detection system, which includes: a magnetic field generating device and a detection device arranged on a conveying path of an insulating substrate, the magnetic field generating device is used to generate a magnetic field, the magnetic field has a standard magnetic field strength, and the detection device is configured to detect the change in the magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field, so as to determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value.

[0056] If there are conductive particles on the insulating substrate, the conductive particles will cause changes in the magnetic field when passing through the magnetic field. Therefore, the detection device can accurately determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value based on the change in magnetic field strength.

[0057] Since the magnetic field is formed on the transmission path of the insulating substrate, it is possible to determine whether the volume of the conductive particles of the insulating substrate is greater than a preset value during the transmission of the insulating substrate. That is, it is possible to achieve early detection before the use of the insulating substrate, achieve the purpose of early prevention, and to a certain extent reduce the problem of the insulating substrate affecting the reliability of use due to the excessive volume of the conductive particles during the subsequent preparation of other devices, etc., and greatly improve the stability of the insulating substrate during use.

[0058] Furthermore, by detecting the change in magnetic field strength to detect the insulating substrate, contactless detection can be achieved during the transmission of the insulating substrate, which will not affect the normal transmission of the insulating substrate and can ensure a normal production rhythm.

[0059] The insulating substrate disclosed in the embodiments of the present application can be used in power, electronics, communications or other fields that require the use of an insulating substrate. For example, the insulating substrate can be used in the field of batteries. The insulating substrate can be used to prepare a separator for a battery.

[0060] The following description will be made by taking the use of an insulating substrate for preparing a battery as an example.

[0061] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical device, which is conducive to improving the stability of battery performance.

[0062] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the detection system of some embodiments of the present application.

[0063] An embodiment of the present application provides a detection system for detecting an insulating substrate 30, which includes: a magnetic field generating device 101, used to generate a magnetic field 40, the magnetic field 40 is formed on the conveying path of the insulating substrate 30, and the magnetic field 40 has a standard magnetic field strength, which is the magnetic field strength of the magnetic field 40 when the insulating substrate 30 does not pass through the magnetic field 40; the detection system also includes: a detection device 102, which is configured to be able to detect the change in the magnetic field strength of the magnetic field 40 compared to the standard magnetic field strength when the insulating substrate 30 passes through the magnetic field 40, so as to determine whether the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field 40 is greater than a preset value.

[0064] The magnetic field 40 generated by the magnetic field generating device 101 is located on the conveying path of the insulating substrate 30, so that the conveyed insulating substrate 30 will pass through the magnetic field 40 in sequence. The conveying path is the route that the insulating substrate 30 passes during the conveying process.

[0065] The magnetic field generating device 101 can be arranged corresponding to the transmission path of the insulating substrate 30. For example, it can be arranged above the transmission path of the insulating substrate 30, or it can be arranged below the transmission path of the insulating substrate 30, or it can be arranged on either side of the transmission path of the insulating substrate 30. It is only necessary that the magnetic field 40 generated by the magnetic field generating device 101 can be formed on the transmission path of the insulating substrate 30.

[0066] The conveying path of the insulating substrate 30 referred to here may be a conveying path for conveying the insulating substrate 30 to the next process, or may be another conveying path. Taking the insulating substrate 30 as a diaphragm as an example, the conveying path may be a conveying path for the diaphragm tape.

[0067] refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of the detection system detecting the diaphragm in some embodiments of the present application. In some embodiments, the transmission path of the diaphragm tape can be a transmission path from the diaphragm feeding to the winding device 42. The winding device 42 is used to wind the positive electrode sheet, the negative electrode sheet and the diaphragm to form a winding structure. The winding structure can be used as part or all of the electrode assembly, and the diaphragm is located between the positive electrode sheet and the negative electrode sheet. The magnetic field generating device 101 and the detection device 102 can be arranged to correspond to the transmission path from the diaphragm feeding to the winding device 42, so that it is possible to detect in advance whether there are conductive particles with a volume greater than a preset value on the diaphragm before the diaphragm is wound into a winding structure.

[0068] In some embodiments, the membrane can be unwound by a membrane unwinding device (e.g., an unwinding roller), and a transition roller 43 can be provided. The unwound membrane passes around the transition roller 43 and is then wound into the winding device 42. In other words, the transmission path of the membrane is from the membrane unwinding device to the transition roller 43, and then from the transition roller 43 to the winding device 42. The magnetic field generating device 101 can be provided between the membrane unwinding device and the transition roller 43, or between the transition roller 43 and the winding device 42. The membrane unwinding device can include, but is not limited to, an unwinding roller.

[0069] In some embodiments, the separator may include a first separator 51 and a second separator 52. The first separator 51 is located between the positive electrode sheet 53 and the negative electrode sheet 54, and the second separator 52 and the first separator 51 are located on both sides of the positive electrode sheet 53. The first separator 51 and the second separator 52 may be respectively conveyed by two different separator unwinding devices and a transition roller 43, and a magnetic field generating device 101 and a detection device 102 may be respectively arranged on the conveying paths of the first separator 51 and the second separator 52, so that the conductive particles on the first separator 51 and the second separator 52 can be respectively detected before the first separator 51 and the second separator 52 are wound into separators.

[0070] In other embodiments, the transmission path of the diaphragm tape may also be a transmission path for the winding structure to be transported to the next processing step after the diaphragm, the positive electrode sheet and the negative electrode sheet are wound into a winding structure. The magnetic field generating device 101 may also be placed facing the transmission path for the winding structure to be transported to the next process, and the generated magnetic field 40 is located on the transmission path for the winding structure to be transported to the next process. If there are conductive particles with a volume greater than a preset value on the diaphragm of the winding structure, the change in magnetic field strength caused by the passing of the magnetic field is different from the change in magnetic field strength caused by the passing of the magnetic field when there are no conductive particles with a volume greater than the preset value on the diaphragm of the winding structure. Therefore, it is also possible to judge whether there are conductive particles with a volume greater than the preset value on the diaphragm of the winding structure based on the change in magnetic field strength.

[0071] That is to say, the conveying path of the diaphragm tape may include two situations, one is a conveying path for conveying only the diaphragm, and the other is a conveying path including the winding structure of the diaphragm.

[0072] If there are conductive particles on the insulating substrate 30, the magnetic field strength will change when passing through the magnetic field 40. Therefore, the detection device 102 can accurately determine whether there are conductive particles with a volume greater than a preset value on the insulating substrate 30 passing through the magnetic field based on the change in magnetic field strength.

[0073] Magnetic field strength refers to the magnetic induction intensity of the magnetic field.

[0074] The insulating substrate passing through the magnetic field referred to here refers to the insulating substrate located in the magnetic field. When the length of the insulating substrate is long, only a portion of the insulating substrate passes through the magnetic field.

[0075] The conductive particles on the insulating substrate passing through the magnetic field referred to here may refer to all the conductive particles located in the same magnetic field 40 at the same time when the insulating substrate 30 passes through the magnetic field 40, and the volume of the conductive particles on the insulating substrate passing through the magnetic field may be: the total volume of all the conductive particles located in the same magnetic field 40 at the same time.

[0076] That is to say, the number of conductive particles on the insulating substrate passing through the magnetic field is not limited to one, but may be multiple. It is understood that the volume of the conductive particles on the insulating substrate passing through the magnetic field being greater than the preset value includes: the number of conductive particles is greater than the preset number, which leads to the situation that the total volume of the plurality of conductive particles is greater than the preset value, and may also include the situation that the particle size of the conductive particles is greater than the preset particle size, which leads to the situation that the volume of the conductive particles is greater than the preset value. The particle size referred to here is the diameter.

[0077] The preset value can be adjusted according to different usage requirements of the insulating substrate 30. For example, if it is necessary to screen out conductive particles with a particle size greater than 50 μm, the preset value can be set to the volume of conductive particles with a particle size of 50 μm, that is, (4 / 3)π×25 3(μm 3 ). That is to say, as long as there is a conductive particle with a particle size greater than 50 μm, it is considered that there are conductive particles with a volume greater than a preset value on the insulating substrate 30 .

[0078] It can be understood that when the preset value is set to the above (4 / 3)π×25 3 (μm 3 ), if it is detected that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the above-mentioned preset value, it does not mean that there is only one conductive particle with a particle size greater than 50μm among the conductive particles passing through the magnetic field. It can also be the case that: the number of conductive particles located in the same magnetic field 40 at the same time is multiple, and the total volume of the multiple conductive particles exceeds the above-mentioned preset value, but the particle size of each of the conductive particles is less than 50μm. That is, by setting the preset value, not only the conductive particles with excessive particle size can be screened out, but also the conductive particles with excessive number can be screened out. When the volume of multiple conductive particles located in the same magnetic field 40 at the same time is less than the preset value, the reliability of the use of the insulating substrate 30 will be greatly improved.

[0079] It is understandable that the degree of change in magnetic field strength caused by conductive particles of different volumes in the magnetic field is different. Therefore, it is possible to accurately determine whether there are conductive particles on the insulating substrate 30 exceeding a preset value based on the change in magnetic field strength when the insulating substrate 30 passes through the magnetic field 40.

[0080] In some embodiments, multiple different positions in the insulating substrate 30 have conductive particles whose volume is greater than a preset value, and these different positions pass through the magnetic field 40 at different times. During the tape movement of the insulating substrate 30, the detection device 102 can detect the changes in magnetic field strength when these positions pass through the magnetic field 40.

[0081] In some embodiments, the conductive particles may be metal particles, and the metal particles may be a single substance or an alloy, for example, including but not limited to at least one of iron, nickel, zinc, and chromium. The metal particles may also be conductive metal oxides. When the metal particles cut the magnetic flux lines, the magnetic field strength will change, and then the electromotive force will change. Through the change of the electromotive force, it can be judged whether the volume of the metal particles is greater than a preset value.

[0082] The conductive particles can also be magnetic materials, which can be strong magnetic materials or weak magnetic materials. Magnetic materials in a magnetic field can cause a sudden change in the magnetic field, thereby causing the magnetic field strength to change.

[0083] The detection device 102 can detect the change of the magnetic field strength of the magnetic field 40. The change of the magnetic field strength referred to here may include but is not limited to the change value of the magnetic field strength or the signal value used to characterize the change of the magnetic field strength. The detection device 102 can be set corresponding to the magnetic field 40 generated by the magnetic field generating device 101, so that the detection device 102 detects the change of the strength of the magnetic field 40.

[0084] In some embodiments, the detection device 102 can also automatically determine whether there are conductive particles with a volume greater than a preset value on the insulating substrate 30 based on the change in magnetic field strength. In other embodiments, the detection device 102 only needs to be able to detect the change in magnetic field strength, and can manually determine whether there are conductive particles with a volume greater than a preset value on the insulating substrate 30 based on the change in magnetic field strength.

[0085] In the above technical solution, since the magnetic field 40 is formed on the conveying path of the insulating substrate 30, it is possible to determine whether the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value during the conveying process of the insulating substrate 30. That is, it is possible to achieve early detection before the use of the insulating substrate 30, achieve the purpose of early prevention, and to a certain extent avoid the problem of the insulating substrate 30 affecting the reliability of use due to the excessive volume of the conductive particles during the subsequent use of other devices, thereby greatly improving the stability of the insulating substrate 30 during use.

[0086] Furthermore, by detecting the change in magnetic field strength to detect the insulating substrate 30 , contactless detection can be achieved during the conveying process of the insulating substrate 30 , which will not affect the normal conveying of the insulating substrate 30 and can ensure a normal production rhythm.

[0087] According to some embodiments of the present application, the detection device 102 includes a magnetometer, and the magnetometer is used to detect the magnetic field strength of the magnetic field 40 .

[0088] The magnetometer can measure the magnetic field strength of the magnetic field 40. The magnetometer can be placed aligned with the magnetic field generating device 101, and can detect the strength of the magnetic field 40.

[0089] The magnetometer can detect the standard magnetic field strength value when no object passes through the magnetic field 40 before the insulating substrate 30 is transported. During the transport of the insulating substrate 30, the magnetometer detects the magnetic field strength in real time and obtains the real-time value of the magnetic field 40. By subtracting the real-time value from the standard magnetic field strength value, the change value of the magnetic field strength when the insulating substrate 30 passes through the magnetic field 40 can be obtained. By comparing the change value of the magnetic field 40 with the standard magnetic field strength change value, it is possible to determine whether there are conductive particles with a volume greater than a preset value on the insulating substrate 30. The standard magnetic field strength change value refers to the difference between the magnetic field strength value generated by the conductive particles passing through the magnetic field when there are only conductive particles with a volume of a preset value on the insulating substrate 30 and the standard magnetic field strength value.

[0090] The magnetic field strength value can be directly obtained by the magnetometer. Based on the magnetic field strength value, it can be determined whether the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than the preset value by manual or software automatic calculation. In some embodiments, the magnetometer itself can output the magnetic field strength change value of the detected magnetic field 40. The magnetic field strength change value referred to here refers to the difference between the real-time value of the magnetic field strength currently detected by the magnetometer and the standard magnetic field strength value.

[0091] In some embodiments, in order to improve the detection accuracy of conductive particles, the selected magnetometer can identify the magnetic field strength with a resolution of 0.01nt. The resolution refers to the ability to reflect the smallest change in magnetic field strength. In this way, even conductive particles with a particle size of microns can be identified.

[0092] In some embodiments, the magnetometer may issue an alarm based on a detection result that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value.

[0093] In some embodiments, the magnetometer can also be connected to a power controller that controls the start and stop of transmission of the insulating substrate 30. When the magnetometer detects that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value, a control signal can be sent to the power controller. The power controller stops the transmission of the insulating substrate 30 in response to the control signal, thereby being able to process the conductive particles on the insulating substrate 30 in a timely manner.

[0094] In the above technical solution, the magnetometer can accurately detect the magnetic field strength of the magnetic field to determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value based on the change value of the magnetic field strength.

[0095] According to some embodiments of the present application, the detection device 102 includes a magnetic field sensor, which is used to generate a detection signal based on the change in magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field, and the detection signal is used to characterize whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value.

[0096] Conductive particles of different volumes passing through the magnetic field will cause different degrees of changes in magnetic field strength, and the detection signals generated by the magnetic field sensor based on the different degrees of changes in magnetic field strength are different. In some embodiments, the preset detection signal generated by the magnetic field sensor when conductive particles of a preset volume pass through the magnetic field can be first detected, and then, by comparing the detection signal detected in real time by the magnetic field sensor during the transmission of the insulating substrate 30 with the preset detection signal, it can be determined whether the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than the preset value.

[0097] In some embodiments, the detection signal includes but is not limited to a voltage signal, a current signal, or a resistance signal.

[0098] In some embodiments, the magnetic field sensor may include: a magnetic field sensing element and a signal processor. The magnetic field sensing element may be made of sensitive magnetic materials, such as a Hall element, a magnetoresistive element, or a magneto-sensitive inductor. The signal processor is responsible for receiving and processing the signal generated by the magnetic field sensing element, converting it into a usable detection signal and outputting it.

[0099] Exemplarily, the magnetic field sensing element may include an electromagnetic coil, which may be placed in the magnetic field 40 generated by the magnetic field generating device 101. When the conductive particles pass through the magnetic field 40, the magnetic field strength changes, and when the magnetic field strength changes, an induced electromotive force is generated in the electromagnetic coil. The signal processor is connected to the electromagnetic coil, processes the induced electromotive force and outputs a corresponding detection signal.

[0100] In some embodiments, the magnetic field sensor may generate an alarm based on a detection result that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value.

[0101] In some embodiments, the magnetic field sensor can also be connected to a power controller that controls the start and stop of the transmission of the insulating substrate 30. When the magnetic field sensor detects that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value, a control signal can be sent to the power controller. The power controller stops the transmission of the insulating substrate 30 in response to the control signal, thereby being able to process the conductive particles on the insulating substrate 30 in a timely manner.

[0102] In the above technical solution, the magnetic field sensor can sense slight changes in the magnetic field 40, and can detect even changes in the magnetic field strength caused by weakly magnetic conductive particles passing through the magnetic field 40. Therefore, the detection rate of the detection device 102 detecting that the volume of conductive particles on the insulating substrate is greater than a preset value can be improved.

[0103] refer to Figure 3 , Figure 3 Schematic diagram of the structure of the detection system of other embodiments of the present application.

[0104] According to some embodiments of the present application, the detection system further includes: a magnetic shielding device 103 , in which the magnetic field generating device 101 and the detection device 102 are located.

[0105] The magnetic shielding device 103 can weaken or block the interference of the magnetic field 40 in the external environment on the magnetic field 40 generated by the magnetic field generating device 101 .

[0106] In some embodiments, the magnetic field shielding device has a shielding cavity, the magnetic field generating device 101 and the detecting device 102 are both located in the shielding cavity, and the magnetic field shielding device is placed corresponding to the transmission path of the insulating substrate 30, for example, it can be placed above, below or on either side of the transmission path. In some embodiments, the magnetic field 40 generated by the magnetic field generating device 101 is formed on the transmission path. Exemplarily, the magnetic field shielding device can be a structure such as a magnetic shielding box or a magnetic shielding cover.

[0107] In the above technical solution, the magnetic shielding device 103 can shield the interference of the magnetic field 40 in the external environment on the magnetic field 40 generated by the magnetic field generating device 101, thereby improving the accuracy of the detection result.

[0108] refer to Figure 4 as well as Figure 5 , Figure 4 It is a structural schematic diagram of the detection system of some other embodiments of the present application; Figure 5 This is a schematic diagram of the principle of obtaining the position of conductive particles with a volume greater than a preset value on an insulating substrate in some embodiments of the present application.

[0109] According to some embodiments of the present application, the detection system further includes: a measuring device configured to: measure the running length of the insulating substrate 30 when the detection device 102 detects that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field 40 is greater than a preset value.

[0110] The running length of the insulating substrate refers to the distance that the insulating substrate 30 travels on the conveying path from the start of the running of the insulating substrate 30 to the moment when the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is detected to be greater than a preset value. Since the detection device 102 detects the conductive particles on the conveying path of the insulating substrate 30, by obtaining the running length of the insulating substrate 30 at the moment when the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is detected to be greater than a preset value, the position of the conductive particles with a volume greater than the preset value on the insulating substrate 30 can be located.

[0111] For example, Figure 5 As shown, Figure 5 In the figure, the insulating substrate 30 at the start of the tape running is shown by a solid line, and the insulating substrate 30 after the tape running starts is shown by a dotted line. In order to describe the transmission path and the insulating substrate 30 respectively, Figure 5 The insulating substrate 30 shown in FIG. 1 is above the conveying path. In the actual tape running process, the insulating substrate 30 overlaps the conveying path.

[0112] A reference position P1 may be set on the insulating substrate 30. At the start of the tape running of the insulating substrate 30, the reference position P1 has a first mapping position Q1 on the transmission path. At the moment when it is detected that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value, the position P2 of the insulating substrate 30 is located at the first mapping position Q1 on the transmission path, and the length of the insulating substrate 30 between P1 and P2 is the current tape running length.

[0113] As can be seen from the above, by referring to position P1 and the tape length, position P2 can be located on the insulating substrate 30. When it is detected that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than the preset value, position P2 of the insulating substrate 30 is located at the first mapping position Q1.

[0114] It can be understood that, since the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is detected to be greater than the preset value, the insulating substrate 30 where the conductive particles with a volume greater than the preset value are located is located just in the magnetic field 40. Therefore, if the first mapping position Q1 is the position where the magnetic field 40 is located, that is, the first distance is 0, then the position P2 on the insulating substrate 30 is the position where the conductive particles with a volume greater than the preset value are located.

[0115] If the first mapping position Q1 is not the position where the magnetic field 40 is located, that is, the first distance L1 is greater than 0, then when the conductive particles with a volume greater than the preset value are detected, the position P2 on the insulating substrate 30 is not the position where the conductive particles with a volume greater than the preset value are located, and the distance between the position P3 where the conductive particles with a volume greater than the preset value are located in the insulating substrate 30 is equal to the first distance L1.

[0116] On the basis of the known position P2 of the insulating substrate 30 and in combination with the first distance L1 , the position P3 of the conductive particles whose volume is greater than a preset value in the insulating substrate 30 can be located.

[0117] Exemplarily, if the first mapping position Q1 is located on the transmission path after the magnetic field 40 , the position P2 is located between the position P1 and the position P3 .

[0118] If the first mapping position Q1 is located on the transmission path before the magnetic field 40 , the position P3 is located between the position P1 and the position P2 .

[0119] In some embodiments, the measuring device may include, but is not limited to, any of an encoder, a laser rangefinder, a visual sensor, or an ultrasonic detector.

[0120] Taking the encoder 104 as an example, the encoder 104 can be installed on a conveying device for conveying the insulating substrate 30. For example, the conveying device includes an unwinding roller and a winding roller, and the insulating substrate 30 is wound on the unwinding roller and the winding roller, and the winding roller can rotate to pull the insulating substrate 30 on the unwinding roller to unfold and run along the conveying path. The running length of the insulating substrate 30 is the number of turns of the unwinding roller multiplied by the circumference of the unwinding roller. The encoder 104 can be installed on the unwinding roller, and the encoder 104 starts to run when the running of the insulating substrate 30 starts. By obtaining the total number of pulses output by the encoder 104 at the moment when the volume of the conductive particles on the insulating substrate passing through the magnetic field is detected to be greater than the preset value, combined with the number of pulses output by the insulating substrate 30 when the unwinding roller rotates one circle, the number of turns of the unwinding roller can be obtained, and the number of turns of the unwinding roller multiplied by the circumference of the unwinding roller is the current running length of the insulating substrate 30.

[0121] In some embodiments, during the running of the insulating substrate 30, the detection device 102 may detect multiple detection results that the volume of the conductive particles on the insulating substrate 30 is greater than a preset value, indicating that multiple locations on the insulating substrate 30 have conductive particles with a volume greater than the preset value. The measuring device can then continuously record the running lengths of the insulating substrate 30 when the conductive particles with a volume greater than the preset value are detected multiple times. After the running is completed, the corresponding locations of the conductive particles with a volume greater than the preset value are calculated based on the different recorded running lengths.

[0122] It is not difficult to find from the above that, only by manually selecting the reference position P1 on the insulating substrate 30, the position of the conductive particles with a volume greater than the preset value on the insulating substrate 30 can be calculated according to the tape length and the reference position of the insulating substrate 30 at the moment when the volume of the conductive particles of the insulating substrate is detected to be greater than the preset value. In some embodiments, the measuring device may further include a first calculation unit, and the above calculation process is written into the first calculation unit in a programming manner, and the calculation is performed by the first calculation unit, so that the position of the conductive particles with a volume greater than the preset value on the insulating substrate 30 can be automatically obtained. The first calculation unit can be any software or computer device that can be used to perform calculation tasks such as arithmetic, logical operations and data transmission, which is well known to those skilled in the art.

[0123] In other embodiments, after obtaining the tape running length, the positions of the conductive particles having a volume greater than a preset value on the insulating substrate 30 may be manually calculated.

[0124] In the above technical solution, the measuring device can obtain the running length of the insulating substrate 30 when the detection device 102 detects that the volume of the conductive particles on the insulating substrate 30 is greater than a preset value. Since the detection device 102 performs detection on the conveying path of the insulating substrate 30, by obtaining the running length of the insulating substrate 30 when the conductive particles are detected to be greater than the preset value, the conductive particles with a volume greater than the preset value can be located on the insulating substrate 30, which is beneficial for the staff to process the conductive particles on the insulating substrate 30 in a timely manner.

[0125] refer to Figure 6 , Figure 6 Schematic diagram of the structure of the detection system of some other embodiments of the present application.

[0126] According to some embodiments of the present application, the detection system also includes: a labeling machine 105, which is communicatively connected to the detection device 102, and the labeling machine 105 is used to label the location where the conductive particles with a volume greater than the preset value are located in response to the detection device 102 detecting that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value.

[0127] The labeling process refers to the labeling machine 105 attaching a label to the position of the conductive particles whose volume is greater than a preset value on the insulating substrate 30, marking the position, and then achieving positioning. The labeling machine 105 can be placed facing the conveying path. During the tape running of the insulating substrate 30, the labeling machine 105 can respond to the detection device 102 detecting that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value, and locate the position of the conductive particles whose volume is greater than the preset value on the insulating substrate 30 in real time.

[0128] The labeling machine 105 includes a sensing component and a labeling component that are communicatively connected. The sensing component is used to send a labeling signal to the labeling component in response to the detection device 102 detecting that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value. The labeling component labels the insulating substrate 30 currently passing through the labeling machine 105 in response to the labeling signal. The labeling component can be a common labeling device in the labeling field.

[0129] In some embodiments, the labeling machine 105 can be arranged at a position directly opposite to the magnetic field 40, that is, the second mapping position of the labeling machine 105 on the conveying path is located in the magnetic field 40. In this way, when the conductive particles with a volume greater than a preset value pass through the magnetic field 40, they are detected by the detection device 102. At the same time, the detection device 102 sends the detection result to the labeling machine 105. In response to the detection result, the labeling machine 105 immediately labels the insulating substrate 30 currently passing through the labeling machine 105.

[0130] In other embodiments, the second mapping position of the labeling machine 105 on the transmission path may also be separated from the magnetic field 40 by a second distance L2, and the insulating substrate 30 passes through the magnetic field 40 and the labeling machine 105 in sequence. When the labeling machine 105 receives the detection result that the volume of the conductive particles passing through the insulating substrate 30 is greater than a preset value detected by the detection device 102, the first time required for the insulating substrate 30 to travel the second distance L2 is calculated based on the second distance L2 and the tape speed of the insulating substrate 30, and the insulating substrate 30 currently passing through the labeling machine 105 is labeled after the first time from the moment when the detection result is received. The tape speed may be set in advance, and the second distance L2 is fixed. By measuring the second distance L2, the first time can be calculated in advance. In this way, the sensing component of the labeling machine 105 can be set to send a labeling signal to the labeling component after the first time of receiving the detection result.

[0131] In some embodiments, the sensing component may include a counter, which is used to count in response to the received detection results. The number of times the counter counts can be set in advance. For example, the counter can be made to count N times in response to the received detection results. The N counts multiplied by the time to complete a counting cycle is equal to the first time. When the count value of the counter reaches N times, a labeling signal is output.

[0132] In the above technical solution, the labeling machine 105 can label the locations of the conductive particles whose volumes are greater than a preset value in real time during the conveying process of the insulating substrate 30, thereby achieving efficient positioning.

[0133] refer to Figure 5 , Figure 6 as well as Figure 8 According to some embodiments of the present application, the detection system further includes: a conveying mechanism 106 for conveying the insulating substrate 30 , wherein the magnetic field 40 generated by the magnetic field generating device 101 is formed on a conveying path of the conveying mechanism 106 for conveying the insulating substrate 30 .

[0134] The conveying mechanism 106 may include, but is not limited to, a gear conveying mechanism, a chain conveying mechanism, or a belt conveying mechanism. For example, the conveying mechanism 106 may include a rotatable winding roller and an unwinding roller, and the two ends of the insulating substrate 30 are respectively wound on the winding roller 1061 and the unwinding roller 1062, and the winding roller 1061 can rotate to pull the insulating substrate 30 wound on the winding roller 1061 to unfold and move along the conveying path.

[0135] In some embodiments, the conveying mechanism 106 may be used to convey the insulating substrate 30 to a next process. For example, for a membrane, the conveying mechanism 106 may feed the membrane to a conveying path of the winding device 42 .

[0136] In other embodiments, the conveying mechanism 106 may not be used to convey the insulating substrate 30 to the next process. Instead, if an abnormality is found during the subsequent use of the insulating substrate 30, the insulating substrate 30 may be placed in the conveying mechanism 106 to simulate the tape-walking scene of the insulating substrate 30. For example, after the diaphragm is wound into an electrode assembly, if the electrode assembly is found to have abnormal self-discharge during use, the diaphragm in the electrode assembly may be disassembled and placed in the conveying mechanism 106 to allow the diaphragm to be tape-walked. During the tape-walking process, the diaphragm passes through the magnetic field in sequence, and the detection device 102 can detect the change in the magnetic field strength when the diaphragm passes through the magnetic field 40, and then can determine whether the volume of the conductive particles on the diaphragm is greater than the preset value.

[0137] In some embodiments, the measuring device can be installed on the conveying mechanism 106, such as on the unwinding roller 1062, or the labeling machine 105 can be arranged facing the conveying path of the conveying mechanism 106, so as to locate the position of conductive particles with a volume greater than a preset value on the insulating substrate 30.

[0138] It is understandable that the detection system in the embodiment of the present application may not include the conveying mechanism 106. In the case where the conveying mechanism 106 is not included, it is only necessary to place the magnetic field generating device 101 and the detection device 102 on the conveying path of the insulating substrate 30 to detect whether there are conductive particles with a volume greater than a preset value on the insulating substrate 30.

[0139] In the above technical solution, when it is necessary to detect the conductive particles on the insulating substrate, the insulating substrate can be placed on a conveying mechanism. During the conveying process of the insulating substrate, the magnetic field generating device and the detection device can detect whether there are conductive particles on the insulating substrate whose volume is greater than a preset value.

[0140] According to some embodiments of the present application, the magnetic field generating device 101 includes any one of a solenoid, an electromagnetic coil, and an electromagnet.

[0141] The magnetic field generating device 101 may be placed facing the conveying path of the insulating substrate 30 , so that the magnetic field 40 generated by the magnetic field generating device 101 can be located on the conveying path without affecting the conveying of the insulating substrate 30 .

[0142] Whether it is a solenoid, electromagnetic coil or electromagnet, it has two magnetic poles with different polarities, namely the N pole (North Pole) and the S pole (South Pole). The magnetic flux lines of the generated magnetic field 40 point from the N pole to the S pole.

[0143] In some embodiments, the direction from the N pole to the S pole of the magnetic field generating device 101 may intersect with the direction of the transmission path of the insulating substrate 30, for example, may form a right angle, an acute angle, or an obtuse angle. In other embodiments, the direction from the N pole to the S pole of the magnetic field generating device 101 may also be parallel to the direction of the transmission path of the insulating substrate 30.

[0144] It is understandable that when the solenoid, electromagnetic coil or electromagnet is energized, a magnetic field 40 will be generated accordingly, and the magnetic field strength of the generated magnetic field 40 can be adjusted by controlling the magnitude of the current passed through, so that changes in the magnetic field strength can be easily detected.

[0145] By adopting the above structure, a magnetic field 40 with controllable magnetic field strength can be generated, which is conducive to adjusting the strength of the magnetic field 40 itself according to different test requirements, that is, adjusting the standard magnetic field strength.

[0146] An embodiment of the present application provides a winding device, which includes: a winding device, which is configured to overlap a diaphragm, a positive electrode sheet and a negative electrode sheet and wind them into a winding structure, with at least one layer of diaphragm being arranged between the positive electrode sheet and the negative electrode sheet; a first conveying device, which is configured to convey the diaphragm, the positive electrode sheet and the negative electrode sheet to the winding device; the detection system in the above embodiment is configured to form a magnetic field on the conveying path of the diaphragm, and detect whether the volume of the conductive particles on the diaphragm passing through the magnetic field is greater than a preset value.

[0147] refer to Figure 2 The first conveying device may include a diaphragm unwinding device, through which the diaphragm can be unwound, and a transition roller 43 may be provided, and the unwound diaphragm passes over the transition roller 43 and is then wound into the winding device 42. The first conveying device may also include a positive electrode sheet unwinding device and a negative electrode sheet unwinding device, which are used to unwind the positive electrode sheet and the negative electrode sheet, respectively.

[0148] In some embodiments, the separator may include a first separator 51 and a second separator 52. The first separator 51 is located between the positive electrode sheet 53 and the negative electrode sheet 54, and the second separator 52 and the first separator 51 are respectively located on both sides of the positive electrode sheet 53. The winding structure may be part or all of an electrode assembly, which is a component in a battery where an electrochemical reaction occurs.

[0149] The detection system may be placed facing the conveying path of the diaphragm feeding to the winding device 42, so that the conductive particles on the diaphragm can be detected in advance before the diaphragm is wound into a winding structure.

[0150] During the transportation of the insulating substrate 30, it can be determined whether there are conductive particles with a volume greater than a preset value on the diaphragm, and the diaphragm can be detected by detecting the change in magnetic field strength, thereby enabling contactless detection during the diaphragm transportation process. While ensuring the normal production rhythm, it can to a certain extent avoid the problem of the reliability of the diaphragm being affected by the excessive volume of the conductive particles during subsequent use, thereby greatly improving the stability of the prepared winding structure.

[0151] An embodiment of the present application provides a lamination device, which includes: a second conveying device, which is configured to convey a diaphragm, a positive electrode sheet and a negative electrode sheet; the detection system in the above embodiment, which is configured to form a magnetic field on the conveying path of the diaphragm, and detect whether the volume of the conductive particles on the diaphragm passing through the magnetic field is greater than a preset value; a cutting device, which is configured to receive and cut the positive electrode sheet and the negative electrode sheet conveyed by the second conveying device; and a lamination device, which is configured to stack the cut positive electrode sheets, diaphragms and negative electrode sheets to form a lamination structure, with at least one layer of diaphragm arranged between the positive electrode sheets.

[0152] The second conveying device may include a separator unwinding device, a positive electrode sheet unwinding device and a negative electrode sheet unwinding device to convey the separator, the positive electrode sheet and the negative electrode sheet respectively. The detection system may form a magnetic field on the path of the separator unwinding device conveying the separator.

[0153] The second conveying device conveys the separator, the positive electrode sheet and the negative electrode sheet to the cutting device. The cutting device may include a positive electrode cutting device and a negative electrode cutting device to cut the positive electrode sheet and the negative electrode sheet respectively to form positive electrode sheets and negative electrode sheets with shorter lengths, or to form notches on the positive electrode sheet and the negative electrode sheet so as to be subsequently bent to form a laminated structure.

[0154] The laminate structure may be part or all of the electrode assembly.

[0155] During the transportation of the insulating substrate 30, it can be determined whether there are conductive particles with a volume greater than a preset value on the diaphragm, and the diaphragm can be detected by detecting the change in magnetic field strength, thereby enabling contactless detection during the diaphragm transportation process. While ensuring the normal production rhythm, it can also avoid to a certain extent the problem of the diaphragm being affected by the excessive volume of the conductive particles during subsequent use, thereby greatly improving the stability of the prepared laminated structure.

[0156] Combined with reference Figure 1 as well as Figure 7 , Figure 7 This is one of the flow charts of the detection method of some embodiments of the present application.

[0157] The present application embodiment provides a detection method, which is applied to the detection system in the above embodiment, and includes:

[0158] Step 110, forming a magnetic field 40 on the conveying path of the insulating substrate 30, wherein the magnetic field 40 has a standard magnetic field strength, which is the magnetic field strength of the magnetic field when the insulating substrate does not pass through the magnetic field 40;

[0159] Step 120, obtaining a magnetic field intensity change of the current magnetic field intensity of the magnetic field 40 compared to the standard magnetic field intensity when the insulating substrate 30 passes through the magnetic field 40;

[0160] Step 130 , determining whether the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field 40 is greater than a preset value based on the change in magnetic field strength.

[0161] The magnetic field 40 may be formed by the magnetic field generating device 101 in the detection system in the above embodiment, and the change in magnetic field intensity when the insulating substrate 30 passes through the magnetic field 40 may be acquired by the detection device 102 .

[0162] The conveying path of the insulating substrate 30 may be a conveying path for conveying the insulating substrate 30 to the next process, or may be another conveying path.

[0163] If there are conductive particles on the insulating substrate 30, the magnetic field strength will change when passing through the magnetic field 40, and the change in magnetic field strength caused by conductive particles of different volumes is different. Therefore, it is possible to accurately judge whether the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value based on the change in magnetic field strength.

[0164] For the description of the conductive particles and the description of the preset values, reference may be made to the relevant description in the above embodiments, which will not be repeated herein.

[0165] In the above technical solution, by forming a magnetic field 40 on the conveying path of the insulating substrate 30, it is possible to perform contactless detection on whether there are conductive particles with a volume greater than a preset value on the insulating substrate during the conveying process, thereby realizing advance detection before the use of the insulating substrate 30, greatly improving the reliability of the insulating substrate 30 during subsequent use, and ensuring a normal production rhythm.

[0166] According to some embodiments of the present application, step 120 may include: using a magnetometer to detect a standard magnetic field strength and a current magnetic field strength.

[0167] refer to Figure 8 , Figure 8 This is the second flowchart of the detection method of some embodiments of the present application.

[0168] Step 130 may include:

[0169] Step 131, obtaining a first difference between a standard magnetic field strength and a current magnetic field strength;

[0170] Step 132, based on the first difference being greater than a preset first difference, determining that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value, the preset first difference being the first difference corresponding to when the volume of the conductive particles on the insulating substrate passing through the magnetic field is equal to the preset value.

[0171] For the description of the magnetometer, reference may be made to the relevant description of the above embodiment, which will not be repeated below.

[0172] In step 120 , the magnetometer may detect the magnetic field strength when no object passes through the magnetic field 40 before the insulating substrate is transported, as the standard magnetic field strength.

[0173] During the transmission of the insulating substrate, the magnetometer detects the magnetic field strength in real time and obtains the real-time value of the magnetic field as the current magnetic field strength.

[0174] In step 132, the preset first difference is the first difference between the current magnetic field strength and the standard magnetic field strength corresponding to the volume of all conductive particles in the same magnetic field at the same time being equal to the preset value. The preset first difference varies according to different preset values. The preset first difference can be obtained by conducting experiments in advance. For example, conductive particles with preset values ​​can be arranged on an insulating substrate, and the corresponding preset first difference can be obtained by passing through the magnetic field through the above calculation method.

[0175] Taking the preset value as the volume of an iron particle with a particle size of 50 μm as an example, the preset first difference value may be 1 nt (nano Tesla), where nt is a unit of magnetic field intensity. When the first difference value obtained during the tape running of the insulating substrate is less than 1 nt, it is considered that the insulating substrate does not have iron particles with a volume greater than the preset value.

[0176] In some embodiments, step 131 and step 132 may be performed manually or automatically by software. In some embodiments, the magnetometer itself can output the first difference value, and can generate an alarm in response to the detection result that the first difference value is greater than the preset first difference value.

[0177] In some embodiments, the magnetometer can also be connected to a power controller that controls the start and stop of the transmission of the insulating substrate. When the magnetometer detects that the first difference is greater than the preset first difference, a control signal can be sent to the power controller. The power controller stops the transmission of the insulating substrate in response to the control signal, thereby being able to process the conductive particles on the insulating substrate in a timely manner.

[0178] In the above technical solution, conductive particles of different volumes will cause different degrees of changes in the magnetic field when passing through the magnetic field. Therefore, by comparing the first difference between the current magnetic field strength and the standard magnetic field strength with the preset first difference, it is possible to accurately determine whether there are conductive particles with a volume greater than a preset value on the insulating substrate passing through the magnetic field.

[0179] According to some embodiments of the present application, step 120 may also include: using a magnetic sensor to detect a change in magnetic field strength of a current magnetic field strength compared to a standard magnetic field strength and generating a detection signal.

[0180] Step 130 may also include:

[0181] Based on the change value between the detection signal and the preset detection signal, it is determined whether there are conductive particles with a volume greater than a preset value on the insulating substrate passing through the magnetic field. The preset detection signal is the detection signal corresponding to when the volume of the conductive particles on the insulating substrate passing through the magnetic field is equal to the preset value.

[0182] For the description of the magnetic sensor, please refer to the above related description, which will not be repeated below.

[0183] In step 120, the magnetic sensor may include an electromagnetic coil and a signal processor, and the electromagnetic coil is placed in the magnetic field 40 generated by the magnetic field generating device 101. When the conductive particles are in the magnetic field 40, the magnetic field strength changes, and when the magnetic field strength changes, an induced electromotive force is generated in the electromagnetic coil. The signal processor is connected to the electromagnetic coil, processes the induced electromotive force and outputs a corresponding detection signal, and the detection signal includes but is not limited to a voltage signal, a current signal or a resistance signal.

[0184] In step 130, the passage of conductive particles of different volumes through the magnetic field will cause changes in magnetic field strength to different degrees, thereby causing the magnetic sensor to output detection signals of different magnitudes.

[0185] The preset detection signal is the detection signal detected by the magnetic sensor when the volume of all conductive particles in the same magnetic field at the same time is equal to the preset value. The preset detection signal varies according to different preset values. The preset detection signal can be obtained by experiments in advance. For example, conductive particles with preset values ​​can be set on the insulating substrate 30 and passed through the magnetic field. The detection signal can be detected by the magnetic sensor as the preset detection signal.

[0186] In some embodiments, the above step 130 can be performed manually, that is, after the magnetic sensor outputs the detection signal, the detection signal is manually compared with the preset detection signal.

[0187] In other embodiments, the above step 130 may also be performed by a magnetic sensor, and a preset detection signal for comparison may be input in advance into the magnetic sensor.

[0188] In some embodiments, the magnetic sensor may generate an alarm based on detecting that the volume of the conductive particles on the insulating substrate 30 passing through the magnetic field is greater than a preset value.

[0189] In some embodiments, the magnetic field sensor can also be connected to a power controller that controls the start and stop of the transmission of the insulating substrate 30. When the magnetic field sensor detects that the insulating substrate 30 passing through the magnetic field has conductive particles with a volume greater than a preset value, a control signal can be sent to the power controller. The power controller stops the transmission of the insulating substrate 30 in response to the control signal, thereby being able to process the conductive particles on the insulating substrate 30 in a timely manner.

[0190] In the above technical solution, the magnetic sensor can sense weak changes in the magnetic field, and can detect even changes in the magnetic field strength caused by weakly magnetic conductive particles passing through the magnetic field. Therefore, the detection rate of the detection device for detecting that the volume of conductive particles on the insulating substrate is greater than a preset value can be improved.

[0191] refer to Fig. 9 , Fig. 9 This is the third flowchart of the detection method of some embodiments of the present application.

[0192] According to some embodiments of the present application, the method further includes:

[0193] Step 140 , in response to the volume of the conductive particles on the insulating substrate passing through the magnetic field being greater than a preset value, obtaining positions of the conductive particles having a volume greater than the preset value on the insulating substrate.

[0194] There may be multiple different positions in the insulating substrate, all of which have conductive particles with a volume greater than a preset value. During the tape conveying process of the insulating substrate, these different positions pass through the magnetic field at different times. The detection device can detect the conductive particles with a volume greater than the preset value one by one when these positions pass through the magnetic field.

[0195] In step 140, during the tape running of the insulating substrate, based on the detection results of the conductive particles with a volume greater than a preset value detected at different times, the positions of the conductive particles with a volume greater than a preset value on the insulating substrate can be respectively obtained.

[0196] Acquiring the position of the conductive particles having a volume greater than a preset value on the insulating substrate referred to herein may mean acquiring position information, or directly marking the position on the insulating substrate.

[0197] In the above technical solution, during the tape conveying process of the insulating substrate, the conductive particles whose volume is larger than the preset value are positioned, so that the staff can handle them in time and improve the production efficiency.

[0198] Combined with reference Figure 5 as well as Fig.10 , Fig.10 This is a fourth flowchart of the detection method of some embodiments of the present application.

[0199] According to some embodiments of the present application, step 140 may include:

[0200] Step 141, selecting a reference position P1 on the insulating substrate 30, at the start time of the insulating substrate 30 running, the reference position P1 has a first mapping position Q1 on the transmission path, and along the transmission path, the first mapping position Q1 is separated from the magnetic field 40 by a first distance L1;

[0201] Step 142, when it is detected that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value, the running length of the insulating substrate is obtained;

[0202] Step 143 , obtaining positions of conductive particles having a volume greater than a preset value on the insulating substrate based on the tape running length, the reference position and the first distance.

[0203] In step 141, at the start time of the running of the insulating substrate 30, the reference position has a first mapping position on the transmission path. That is, at the start time of the running of the insulating substrate 30, the reference position of the insulating substrate 30 is already located on the transmission path, which is conducive to positioning the reference position relative to the magnetic field 40 at the start time of the running of the insulating substrate 30.

[0204] It can be understood that since the first mapping position corresponding to the reference position is not necessarily the position where the magnetic field 40 is located, it is necessary to obtain the first distance L1 between the reference position and the magnetic field 40, which is subsequently used to compensate for the position of conductive particles with a volume greater than a preset value on the insulating substrate 30 based on the reference position and the tape length.

[0205] The reference position may be selected from one end of the insulating substrate 30, or a position close to the end. The reference position P1 may be manually measured before the tape running of the insulating substrate 30 begins. For example, the distance between the reference position P1 and one end of the insulating substrate 30 may be measured to locate the reference position P1. If the first mapping position Q1 is not the position where the magnetic field 40 is located, the first mapping position Q1 of the reference position P1 on the transmission path may be manually determined before the tape running of the insulating substrate 30 begins, and the distance between the first mapping position Q1 and the magnetic field 40 may be measured.

[0206] In some embodiments, before the insulating substrate 30 is tape-guided, part of the insulating substrate 30 has been placed on the transmission path, and one end of the insulating substrate 30 is located at the end of the transmission path. For example, when the transmission path is a transmission path for feeding the diaphragm to the winding device 42, the starting point of the transmission path can be the diaphragm unwinding device, and the end point of the transmission path is the winding device 42. When the diaphragm has not started to run, one end of the diaphragm is located at the winding device 42, and the other end of the diaphragm is wound on the diaphragm unwinding device, that is, at this time, the diaphragm has been placed on the transmission path, and the reference position P1 can be selected as any position of the diaphragm located on the transmission path when the diaphragm has not started to run. Exemplarily, the reference position P1 can be selected as a position located at the magnetic field 40.

[0207] In step 142, the current tape running length refers to the distance the insulating substrate travels on the conveying path from the start of tape running to the moment when the volume of the conductive particles on the insulating substrate passing through the magnetic field is detected to be greater than a preset value.

[0208] like Figure 7 As shown, at the start of the tape running of the insulating substrate 30, the reference position P1 has a first mapping position Q1 on the conveying path. At the moment when the volume of the conductive particles on the insulating substrate passing through the magnetic field is detected to be greater than a preset value, the position P2 of the insulating substrate 30 is located at the first mapping position Q1 on the conveying path, and the length of the insulating substrate 30 between P1 and P2 is the current tape running length.

[0209] The tape length can be obtained by any one of the encoder 104, laser rangefinder, visual sensor or ultrasonic detector. The principle of the encoder 104 obtaining the tape length can be referred to the relevant description of the above embodiment, which will not be repeated below.

[0210] In step 143, by referring to position P1 and the tape length, position P2 can be located on the insulating substrate 30. When it is detected that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value, position P2 of the insulating substrate 30 is located at the first mapping position Q1.

[0211] It can be understood that, at the moment when the conductive particles with a volume greater than the preset value are detected, the insulating substrate 30 in the area where the conductive particles with a volume greater than the preset value are located is exactly located in the magnetic field 40. Therefore, if the first mapping position Q1 is the position where the magnetic field 40 is located, that is, the first distance L1 is 0, then the position P2 on the insulating substrate 30 is the position where the conductive particles with a volume greater than the preset value are located.

[0212] If the first mapping position Q1 is not the position where the magnetic field 40 is located, that is, the first distance L1 is greater than 0, then at the moment when the conductive particles with a volume greater than the preset value are detected, the position P2 on the insulating substrate 30 is not the position where the conductive particles with a volume greater than the preset value are located, and the distance between the position P3 where the conductive particles with a volume greater than the preset value are located in the insulating substrate 30 is equal to the first distance L1.

[0213] On the basis of the known position P2 of the insulating substrate 30 and in combination with the first distance L1 , the position P3 of the conductive particles whose volume is greater than a preset value in the insulating substrate 30 can be located.

[0214] Exemplarily, if the first mapping position Q1 is located on the transmission path after the magnetic field 40 , the position P2 is located between the position P1 and the position P3 .

[0215] If the first mapping position Q1 is located on the transmission path before the magnetic field 40 , the position P3 is located between the position P1 and the position P2 .

[0216] In the above technical solution, by obtaining the running length of the insulating substrate when the conductive particles are detected to be greater than the preset value, the conductive particles whose volume is greater than the preset value can be located on the insulating substrate, which is conducive to the staff to deal with the conductive particles on the insulating substrate in time.

[0217] Combined with reference Figure 6 as well as Fig.11 , Fig.11 This is flowchart five of the detection method of some embodiments of the present application.

[0218] According to some embodiments of the present application, step 140 may also include:

[0219] Step 141 ′, placing the labeling machine 105 facing the conveying path of the insulating substrate 30, so that the insulating substrate 30 passes through the magnetic field 40 and the labeling machine 105 in sequence, and the second mapping position of the labeling machine 105 on the conveying path is separated from the magnetic field 40 by a second distance L2;

[0220] Step 142', when it is detected that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value, the labeling machine is controlled to label the locations of the conductive particles whose volume is greater than the preset value based on the second distance L2 and the tape speed of the insulating substrate 30.

[0221] For the description of the labeling machine 105 , reference may be made to the above related description, which will not be repeated below.

[0222] In step 142', when the labeling machine 105 receives the detection result that the detection device 102 detects that there are conductive particles with a volume greater than a preset value on the insulating substrate 30 passing through the magnetic field, the first time required for the insulating substrate 30 to travel the second distance L2 is calculated based on the second distance L2 and the tape speed of the insulating substrate 30, and the insulating substrate 30 currently passing through the labeling machine 105 is labeled after the first time from the moment when the detection result is received. The tape speed can be set in advance, and the second distance L2 is fixed. By measuring the second distance L2, the first time can be calculated in advance. In this way, the sensor component of the labeling machine 105 can be set to send a labeling signal to the labeling component after the first time of receiving the detection result.

[0223] In some embodiments, the sensing component may include a counter, which is used to count in response to the received detection results. The number of times the counter counts can be set in advance. For example, the counter can be made to count N times in response to the received detection results. The N counts multiplied by the time to complete a counting cycle is equal to the first time. When the count value of the counter reaches N times, a labeling signal is output.

[0224] In the above technical solution, the labeling machine 105 can label the positions of the conductive particles whose volumes are larger than a preset value in real time during the conveying process of the insulating substrate 30 , thereby achieving efficient positioning.

[0225] According to some embodiments of the present application, the insulating substrate 30 is a diaphragm, and a magnetic field 40 is formed on a conveying path of the diaphragm to a winding device 42, and the winding device 42 is used to wind the positive electrode sheet 53, the negative electrode sheet 54 and the diaphragm to form a winding structure.

[0226] For the description of feeding the diaphragm to the winding device 42 , reference may be made to the relevant description in the above embodiment, which will not be repeated below.

[0227] refer to Figure 4 In some embodiments, the diaphragm may include a first diaphragm 51 and a second diaphragm 52. The first diaphragm 51 is located between the positive electrode sheet 53 and the negative electrode sheet 54, and the second diaphragm 52 and the first diaphragm 51 are located on both sides of the positive electrode sheet 53. A magnetic field 40 may be formed on the conveying path of the first diaphragm 51 and the second diaphragm 52 to the winding device 42, respectively, to detect whether there are conductive particles with a volume greater than a preset value on the first diaphragm 51 and the second diaphragm 52.

[0228] In the above technical solution, before the diaphragm is wound into a winding structure, whether there are conductive particles on the diaphragm with a volume greater than a preset value is detected in advance, which can greatly improve the reliability of the prepared winding structure, improve the yield of the prepared winding structure, and to a certain extent avoid the problem of short circuit during the use of the winding structure.

[0229] According to some embodiments of the present application, a magnetic field 40 is formed on a conveying path of an electrode assembly, and the electrode assembly includes a diaphragm, and step 120 may include:

[0230] The magnetic field strength change of the current magnetic field strength of the magnetic field 40 compared with the standard magnetic field strength is obtained when the electrode assembly passes through the magnetic field 40 .

[0231] Step 130 may include:

[0232] It is determined whether the volume of the conductive particles on the diaphragm of the electrode assembly passing through the magnetic field is greater than a preset value based on the change in the magnetic field strength.

[0233] In some embodiments, the conveying path of the electrode assembly may be a conveying path for the electrode assembly to be transported to the next processing step after the separator and the electrode sheet are wound into the electrode assembly.

[0234] It is understandable that the electrode assembly has a conductive positive electrode sheet 53 and a negative electrode sheet 54 , and when the electrode assembly passes through a magnetic field, even if there are no conductive particles on the diaphragm, the magnetic field strength will change.

[0235] However, since conductors of different volumes passing through a magnetic field will cause the magnetic field strength to change to varying degrees, it is possible to determine whether there are conductive particles with a volume greater than a preset value on the diaphragm of the electrode assembly by judging the magnitude of the change in magnetic field strength.

[0236] The method for judging whether there are conductive particles with a volume greater than a preset value on the diaphragm of the electrode assembly based on the change in magnetic field strength can refer to the above-mentioned method for judging whether there are conductive particles with a volume greater than a preset value on the insulating substrate 30, which will not be repeated below.

[0237] In the above technical scheme, after the electrode assembly is prepared, it is possible to detect whether there are conductive particles with a volume greater than a preset value on the diaphragm of the electrode assembly on the conveying path of the electrode assembly. On the one hand, it is possible to timely determine whether there is an abnormality in the process of preparing the electrode assembly based on the detection results. On the other hand, it is conducive to further improving the reliability and stability of the electrode assembly during subsequent use.

[0238] The present application embodiment provides a detection system, referring to Figure 2 , which includes: a magnetic field generating device 101, used to generate a magnetic field 40, the magnetic field 40 is formed on the transmission path of the diaphragm tape, and the magnetic field has a standard magnetic field strength, which is the magnetic field strength of the magnetic field when the insulating substrate does not pass through the magnetic field; a detection device 102, configured to be able to detect the change in the magnetic field strength of the magnetic field 40 compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field 40, so as to determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field 40 is greater than a preset value.

[0239] The conveying path of the diaphragm tape may include two situations. One is a conveying path for conveying only the diaphragm, for example, it may be a path for feeding the diaphragm to the winding device 42. The other is a conveying path for the electrode assembly including the diaphragm.

[0240] The detection device 102 may include a magnetometer, which is used to obtain the change value of the magnetic field strength of the magnetic field 40, and determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value based on the change value of the magnetic field strength.

[0241] The detection device 102 may also include a magnetic field sensor, which is used to generate a detection signal based on the change in the magnetic field strength of the magnetic field when the insulating substrate passes through the magnetic field 40 compared to the standard magnetic field strength. The detection signal is used to indicate whether the volume of the conductive particles on the insulating substrate passing through the magnetic field 40 is greater than a preset value. The magnetic field sensor may include an electromagnetic coil and a signal processor. The electromagnetic coil may be placed in the magnetic field 40 generated by the magnetic field generating device 101. When the conductive particles pass through the magnetic field, the magnetic field strength changes. When the magnetic field strength changes, an induced electromotive force is generated in the electromagnetic coil. The signal processor is connected to the electromagnetic coil, processes the induced electromotive force and outputs a corresponding voltage signal.

[0242] The detection system further includes: a magnetic shielding device 103 , in which the magnetic field generating device 101 and the detection device 102 are located.

[0243] The detection system further includes: a measuring device, which is in communication connection with the detection device 102 and is configured to: measure the running length of the insulating substrate when the detection device detects that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value. The measuring device may include but is not limited to any one of an encoder, a laser rangefinder, a visual sensor, or an ultrasonic detector.

[0244] refer to Figure 8 The detection system also includes: a labeling machine 105, which is communicatively connected to the detection device 102, and the labeling machine 105 is used to label the location of the conductive particles whose volume is greater than the preset value based on the detection device 102 detecting that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value.

[0245] The detection system further includes a conveying mechanism 106 for conveying the insulating substrate 30 , wherein the magnetic field 40 generated by the magnetic field generating device 101 is formed on a conveying path of the insulating substrate 30 conveyed by the conveying mechanism 106 .

[0246] The magnetic field generating device 101 includes any one of a solenoid, an electromagnetic coil, and an electromagnet.

[0247] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A detection system for detecting an insulating substrate, characterized in that: include: A magnetic field generating device, used for generating a magnetic field, wherein the magnetic field is formed on a conveying path of the insulating substrate, and the magnetic field has a standard magnetic field strength, which is the magnetic field strength of the magnetic field when the insulating substrate does not pass through the magnetic field; a detection device configured to detect a change in the magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field, so as to determine whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value; The detection system also includes: a measuring device, which is communicatively connected to the detection device and is configured to: measure the running length of the insulating substrate when the detection device detects that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value, wherein a reference position is provided on the insulating substrate, and at the start time of the running of the insulating substrate, the reference position has a first mapping position on the transmission path, and along the transmission path, the first mapping position is separated from the magnetic field by a first distance; The measuring device further includes a first calculation unit configured to obtain positions of conductive particles having a volume greater than the preset value on the insulating substrate based on the tape running length, the reference position and the first distance.

2. The detection system according to claim 1, characterized in that: The detection device comprises a magnetometer, and the magnetometer is used to detect the magnetic field strength of the magnetic field.

3. The detection system according to claim 1, characterized in that: The detection device includes a magnetic field sensor, which is used to generate a detection signal based on the change in the magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field. The detection signal is used to indicate whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value.

4. The detection system according to any one of claims 1 to 3, characterized in that: The detection system further includes: a magnetic shielding device, wherein the magnetic field generating device and the detection device are located inside the magnetic shielding device.

5. The detection system according to any one of claims 1 to 3, characterized in that: The detection system also includes: A labeling machine is communicatively connected to the detection device, and is used for labeling the location where the conductive particles whose volume is greater than the preset value are located in response to the detection device detecting that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value.

6. The detection system according to any one of claims 1 to 3, characterized in that: The detection system also includes: A conveying mechanism is used to convey the insulating substrate, wherein: The magnetic field generated by the magnetic field generating device is formed on a conveying path of the insulating substrate conveyed by the conveying mechanism.

7. The detection system according to any one of claims 1 to 3, characterized in that: The magnetic field generating device includes any one of a solenoid, an electromagnetic coil, and an electromagnet.

8. A winding device, characterized in that: include: A winding device, configured to overlap and wind the separator, the positive electrode sheet and the negative electrode sheet into a winding structure, wherein at least one layer of the separator is disposed between the positive electrode sheet and the negative electrode sheet; A first conveying device, configured to convey the separator, the positive electrode sheet, and the negative electrode sheet to the winding device; The detection system described in any one of claims 1 to 7 is configured to form a magnetic field on the transmission path of the diaphragm and detect whether the volume of the conductive particles on the diaphragm passing through the magnetic field is greater than a preset value.

9. A lamination device, characterized in that: include: A second conveying device, configured to convey the separator, the positive electrode sheet, and the negative electrode sheet; The detection system according to any one of claims 1 to 7, configured to form a magnetic field on the transmission path of the diaphragm, and detect whether the volume of the conductive particles on the diaphragm passing through the magnetic field is greater than a preset value; a cutting device, configured to receive and cut the positive electrode sheet and the negative electrode sheet conveyed by the second conveying device; A lamination device is configured to stack the cut positive electrode sheets, the separator and the cut negative electrode sheets to form a lamination structure, wherein at least one layer of the separator is arranged between the positive electrode sheets.

10. A detection method, characterized in that: include: A magnetic field is formed on a conveying path of the insulating substrate tape, wherein the magnetic field has a standard magnetic field strength, and the standard magnetic field strength is the magnetic field strength of the magnetic field when the insulating substrate does not pass through the magnetic field; Obtaining a change in magnetic field strength of a current magnetic field strength of the magnetic field compared to the standard magnetic field strength when the insulating substrate passes through the magnetic field; Determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value based on the change in the magnetic field strength; the method further includes: In response to the volume of the conductive particles on the insulating substrate passing through the magnetic field being greater than a preset value, obtaining positions of the conductive particles with a volume greater than the preset value on the insulating substrate, wherein obtaining positions of the conductive particles with a volume greater than the preset value on the insulating substrate comprises: A reference position is selected on the insulating substrate, and at the start time of the insulating substrate running, the reference position has a first mapping position on the transmission path, and along the transmission path, the first mapping position is separated from the magnetic field by a first distance; When it is detected that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value, obtaining the running length of the insulating substrate; The positions of the conductive particles whose volumes are greater than the preset value on the insulating substrate are acquired based on the running length, the reference position and the first distance.

11. The method according to claim 10, characterized in that Acquiring the change in magnetic field strength includes: Using a magnetometer to detect the standard magnetic field strength and the current magnetic field strength; and Determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value includes: Obtaining a first difference between the standard magnetic field strength and the current magnetic field strength; Based on the fact that the first difference is greater than a preset first difference, it is determined that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value, and the preset first difference is the first difference corresponding to when the volume of the conductive particles on the insulating substrate passing through the magnetic field is equal to the preset value.

12. The method according to claim 10, characterized in that Acquiring the change in magnetic field strength includes: Using a magnetic sensor to detect a change in magnetic field strength of the current magnetic field strength compared to the standard magnetic field strength and generate a detection signal; and Determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value includes: Based on the change value between the detection signal and the preset detection signal, it is determined whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than the preset value. The preset detection signal is the detection signal corresponding to when the volume of the conductive particles on the insulating substrate passing through the magnetic field is equal to the preset value.

13. The method according to claim 11, characterized in that The step of obtaining the locations of the conductive particles having a volume greater than the preset value on the insulating substrate further comprises: Placing a labeling machine facing a conveying path along which the insulating substrate is conveyed, so that the insulating substrate passes through the magnetic field and the labeling machine in sequence, and a second mapping position of the labeling machine on the conveying path is separated from the magnetic field by a second distance; When it is detected that the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value, the labeling machine is controlled to label the position where the conductive particles whose volume is greater than the preset value are located based on the second distance and the tape speed of the insulating substrate.

14. The method according to any one of claims 10 to 12, characterized in that: The insulating substrate is a diaphragm, and the magnetic field is formed on a conveying path where the diaphragm is fed to a winding device, and the winding device is used to wind the positive electrode sheet, the negative electrode sheet and the diaphragm to form a winding structure.

15. The method according to any one of claims 10 to 12, characterized in that: The magnetic field is formed on a conveying path of the electrode assembly, the electrode assembly includes a diaphragm, and obtaining the change in the magnetic field strength includes: Acquire a change in magnetic field strength of a current magnetic field strength of the magnetic field compared to the standard magnetic field strength when the electrode assembly passes through the magnetic field; and The determining whether the volume of the conductive particles on the insulating substrate passing through the magnetic field is greater than a preset value based on the change in the magnetic field strength comprises: It is determined whether the volume of the conductive particles on the diaphragm of the electrode assembly passing through the magnetic field is greater than a preset value based on the change in the magnetic field strength.

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