Electrode sheet defect detection device, system and method

Abstract

An electrode sheet defect detection device, system and method. The electrode sheet defect detection device comprises: a detection control assembly (30) and a signal detection assembly (31), wherein the signal detection assembly (31) is used for generating a detection magnetic field, which is used for generating a target eddy current in a target detection region of an electrode sheet (E) to be detected; the signal detection assembly (31) is further used for generating a target detection signal under the combined excitation of the detection magnetic field and an eddy-current magnetic field, the eddy-current magnetic field being a magnetic field generated by the target eddy current; and the detection control assembly (30) is used for receiving the target detection signal output by the signal detection assembly (31), and performing, on the basis of the target detection signal, defect detection on the target detection region.

Description

Pole piece defect detection device, system and method

[0001] Cross-reference to related applications

[0002] This application is based on the Chinese Patent Application No. 2024107324325 entitled "Pole piece defect detection device, system and method" filed on June 06, 2024, which is incorporated by reference in its entirety into this application. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to a pole piece defect detection device, system and method. BACKGROUND

[0004] The quality of the pole piece is a key indicator that needs to be strictly controlled in the battery production process, and the quality of the pole piece will affect the performance indicators of the battery. Considering that there may be micro-cracks or false welding in the welding process of the pole piece aluminum foil, it is very important to detect defects in the pole piece.

[0005] In the related art, the pole piece image is collected, and the pole piece defect detection is performed according to the collected pole piece image. However, the related art has the problem of low detection accuracy.

[0006] SUMMARY

[0007] In view of the above problems, the present application provides a pole piece defect detection device, system and method, which solves the problem of low defect detection accuracy in the related art.

[0008] In a first aspect, the present application provides a pole piece defect detection device, which comprises a detection control component and a signal detection component.

[0009] The signal detection component is configured to generate a detection magnetic field, and the detection magnetic field is configured to generate a target eddy current in a target detection area of a to-be-detected pole piece.

[0010] The signal detection component is further configured to generate a target detection signal under the joint excitation of the detection magnetic field and an eddy current magnetic field, wherein the eddy current magnetic field is a magnetic field generated by the target eddy current.

[0011] The detection control component is configured to receive the target detection signal output by the signal detection component, and perform defect detection on the target detection area according to the target detection signal.

[0012] In the technical solution of the embodiment of the present application, the signal detection component generates a detection magnetic field to generate a target eddy current in a target detection area of the to-be-tested pole piece, and generates a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field generated by the target eddy current; further, the detection control component performs defect detection on the target detection area according to the target detection signal sent by the signal detection component. Compared with the defect detection method based on the pole piece image in the related art, in the embodiment of the present application, the defect detection on the target detection area is performed based on the target detection signal generated by the signal detection component. Since the target detection signal can be used to indicate the surface defect condition and / or internal defect condition of the target detection area of the to-be-tested pole piece, the embodiment of the present application can not only detect the surface defects of the pole piece, but also detect the internal defects of the pole piece other than the surface. Therefore, the accuracy of the defect detection of the embodiment of the present application is higher.

[0013] In some embodiments, the detection control component is specifically used for:

[0014] According to the signal intensity of the target detection signal and the signal intensity threshold corresponding to different defect degrees preset, the defect degree of the target detection area is determined.

[0015] In the technical solution of the embodiment of the present application, the detection control component determines the defect degree of the target detection area by the way of determining the defect degree of the target detection area according to the signal intensity of the target detection signal and the signal intensity threshold corresponding to different defect degrees preset. The defect degree of the target detection area can be determined simply and accurately, thereby facilitating to improve the accuracy of the defect detection.

[0016] In some embodiments, the signal detection component includes a detection coil, the detection coil is connected with an external excitation power supply and connected with the detection control component.

[0017] The detection coil is used to generate a detection magnetic field under the excitation of the electrical signal input by the external excitation power supply, and is used to generate a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field, and output the target detection signal to the detection control component through the connection between the detection coil and the detection control component.

[0018] In the technical solution of the embodiment of the present application, the detection coil in the signal detection component generates a detection magnetic field, and generates a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field. In this way, the detection of the target detection signal can be realized on the basis of the simple structure of the signal detection component, not only the occupied space of the component can be saved, but also the cost of the component can be saved.

[0019] In some embodiments, the signal detection component includes a shell, and the detection coil is arranged in a containing cavity formed by the shell.

[0020] The signal detection component further includes a ball, and the ball is arranged on a mounting portion of a side of the shell facing the to-be-tested pole piece.

[0021] In the technical scheme of the embodiment of the present application, the detection coil is arranged in the accommodating cavity formed by the shell, so that the detection coil can be protected and the safety of the detection assembly can be improved. By arranging the balls on the mounting portion of the shell facing the to-be-detected pole piece, the to-be-detected pole piece will not be scratched by the signal detection assembly due to its own shaking when the interval distance between the signal detection assembly and the to-be-detected pole piece is close enough, so that the to-be-detected pole piece can be protected.

[0022] In some embodiments, the pole piece defect detection device further comprises a moving mechanism;

[0023] The moving mechanism is configured to move the signal detection assembly under the control of the detection control assembly.

[0024] In the technical scheme of the embodiment of the present application, the moving mechanism is arranged in the pole piece defect detection device, and the signal detection assembly is moved under the control of the detection control assembly, so that the signal detection assembly is always located on one side of the target detection area of the to-be-detected pole piece during the detection process, that is, the target detection area of the to-be-detected pole piece belongs to the effective detection range of the signal detection assembly, so that the accuracy of the defect detection of the target detection area can be further improved.

[0025] In some embodiments, the moving mechanism comprises a first moving assembly and a second moving assembly.

[0026] The first moving assembly is configured to move the signal detection assembly in a first direction under the control of the detection control assembly.

[0027] The second moving assembly is configured to move the signal detection assembly in a second direction under the control of the detection control assembly. The first direction is parallel to the plane in which the to-be-detected pole piece is located and perpendicular to the transmission direction of the to-be-detected pole piece, and the second direction is perpendicular to the plane in which the to-be-detected pole piece is located.

[0028] In the technical scheme of the embodiment of the present application, the moving mechanism comprises the first moving assembly that can move the signal detection assembly in the first direction and the second moving assembly that can move the signal detection assembly in the second direction, so that the position of the signal detection assembly can be flexibly controlled. Not only can the target detection area of the to-be-detected pole piece always belong to the effective detection range of the signal detection assembly, but also the interval distance between the signal detection assembly and the to-be-detected pole piece can meet the preset detection distance, so that the accuracy of the defect detection of the target detection area can be further improved.

[0029] In some embodiments, the pole piece defect detection device further comprises a fluctuation detection component, the fluctuation detection component is arranged near the first transmission position of the pole piece transmission mechanism, the signal detection component is arranged near the second transmission position of the pole piece transmission mechanism, and the pole piece transmission mechanism drives the to-be-detected pole piece in a direction from the first transmission position to the second transmission position;

[0030] The fluctuation detection component is configured to detect position fluctuation information of the target detection area in the first direction when the pole piece transmission mechanism drives the target detection area to the first transmission position, and send the position fluctuation information to the detection control component;

[0031] The detection control component is configured to control the movement mechanism to drive the signal detection component to move in the first direction when the pole piece transmission mechanism drives the target detection area to the second transmission position, the first direction being parallel to the plane where the to-be-detected pole piece is located and perpendicular to the transmission direction of the to-be-detected pole piece.

[0032] In the technical scheme of the embodiments of the present application, through the linkage of the fluctuation detection component, the detection control component and the movement mechanism, the fluctuation following control purpose of the target detection area is achieved, and even if there is jitter in the pole piece transmission process, the target detection area of the to-be-detected pole piece can always belong to the effective detection range of the signal detection component, thereby facilitating further improvement of the accuracy of defect detection of the target detection area.

[0033] In some embodiments, the detection control component is specifically configured to:

[0034] determine the time when the target detection area is driven to the second transmission position according to the time when the target detection area is driven to the first transmission position, the distance between the first transmission position and the second transmission position, and the transmission speed of the to-be-detected pole piece;

[0035] control the movement mechanism to drive the signal detection component to move in the first direction by a fluctuation distance at the time when the target detection area is driven to the second transmission position according to the fluctuation distance indicated by the position fluctuation information.

[0036] In the technical scheme of the embodiments of the present application, the detection control component determines the time when the target detection area is driven to the second transmission position according to the time when the target detection area is driven to the first transmission position, the distance between the first transmission position and the second transmission position, and the transmission speed of the to-be-detected pole piece, and controls the movement mechanism to drive the signal detection component to move in the first direction by a fluctuation distance at the time when the target detection area is driven to the second transmission position according to the fluctuation distance indicated by the position fluctuation information, so that the fluctuation following control purpose of the target detection area can be more accurately achieved, thereby facilitating further improvement of the accuracy of defect detection of the target detection area.

[0037] In some embodiments, the detection control component is specifically configured to:

[0038] determine the transmission duration according to the distance between the first transmission position and the second transmission position and the transmission speed of the to-be-tested pole piece;

[0039] determine the time when the target detection area is transmitted to the second transmission position according to the time when the target detection area is transmitted to the first transmission position and the transmission duration.

[0040] In the technical scheme of the embodiments of the present application, the transmission duration is determined according to the distance between the first transmission position and the second transmission position and the transmission speed of the to-be-tested pole piece, and the time when the target detection area is transmitted to the second transmission position is determined according to the time when the target detection area is transmitted to the first transmission position and the transmission duration, so that the time when the target detection area is transmitted to the second transmission position can be accurately determined, and the signal detection component can be accurately driven to move in the first direction.

[0041] In some embodiments, the detection control component is further configured to:

[0042] send the defect detection result to the production control component, wherein the defect detection result is used to instruct the production control component to determine whether the pole piece transmission mechanism needs to be stopped based on the defect detection result.

[0043] In the technical scheme of the embodiments of the present application, the detection control component sends the defect detection result to the production control component, so that the production control component determines whether the pole piece transmission mechanism needs to be stopped based on the defect detection result, which can timely identify the production defects generated in the pole piece production process, so as to alleviate the problem that the defective pole pieces flow into the subsequent process, causing cost waste and manpower waste, and also alleviate the problem that the risk battery flows into the market, causing the consequence of regrinding estimation, thereby improving the production efficiency of the pole piece and the performance of the prepared battery.

[0044] In some embodiments, the detection control component is further configured to:

[0045] send the defect detection result to the marking component, wherein the defect detection result is used to instruct the marking component to determine whether a defect mark needs to be made in the target detection area based on the defect detection result.

[0046] In the technical scheme of the embodiments of the present application, the detection control component sends the defect detection result to the marking component, so that the marking component determines whether a defect mark needs to be made in the target detection area based on the defect detection result, which can make a defect mark in the corresponding target detection area in the case that there is a defect area in any target detection area of the to-be-tested pole piece, so that the defect area on the to-be-tested pole piece can be quickly located subsequently.

[0047] In a second aspect, the application provides a pole piece defect detection system, the pole piece defect detection system comprising a pole piece transmission mechanism, a production control component, and the pole piece defect detection device according to any one of the first aspect;

[0048] The pole piece defect detection device is configured to determine a defect detection result of the target detection area of the pole piece under test, and send the defect detection result to the production control component.

[0049] The production control component is configured to determine whether the pole piece transmission mechanism needs to be stopped based on the defect detection result.

[0050] In some embodiments, the pole piece production system further comprises a marking component.

[0051] The pole piece defect detection device is further configured to send the defect detection result to the marking component.

[0052] The marking component is configured to mark defects on the target detection area of the pole piece under test according to the defect detection result.

[0053] In a third aspect, the application provides a pole piece defect detection method, the pole piece defect detection method being applied to the pole piece defect detection device according to any one of the first aspect; the method comprising:

[0054] The signal detection component in the pole piece defect detection device generates a detection magnetic field, and generates a target detection signal under the joint excitation of the detection magnetic field and an eddy current magnetic field; the detection magnetic field is configured to generate a target eddy current in the target detection area of the pole piece under test, and the eddy current magnetic field is a magnetic field generated by the target eddy current.

[0055] The detection control component in the pole piece defect detection device receives the target detection signal output by the signal detection component, and performs defect detection on the target detection area according to the target detection signal.

[0056] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, the following detailed description of the preferred embodiments can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, the following detailed description of the preferred embodiments of the application is provided. BRIEF DESCRIPTION OF DRAWINGS

[0057] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the application. Moreover, the same reference numbers in all the drawings represent the same or similar elements. In the drawings:

[0058] FIG. 1 is a structural schematic diagram of a pole piece according to an embodiment of the application;

[0059] FIG. 2 is a schematic diagram of the principle of eddy current detection according to some embodiments of the present application;

[0060] FIG. 3 is a schematic diagram of the structure of an electrode sheet defect detection device according to some embodiments of the present application;

[0061] FIG. 4 is a schematic diagram of the structure of a signal detection assembly according to some embodiments of the present application;

[0062] FIG. 5 is a schematic diagram of the structure of a signal detection assembly according to some other embodiments of the present application;

[0063] FIG. 6 is a schematic diagram of the structure of a signal detection assembly according to some other embodiments of the present application;

[0064] FIG. 7 is a schematic diagram of the structure of an electrode sheet defect detection device according to some other embodiments of the present application;

[0065] FIG. 8 is a schematic diagram of the structure of an electrode sheet defect detection device according to some other embodiments of the present application;

[0066] FIG. 9 is a schematic diagram of the structure of an electrode sheet defect detection device according to some other embodiments of the present application;

[0067] FIG. 10 is a schematic diagram of the target detection signal of a standard electrode sheet sample according to some embodiments of the present application;

[0068] FIG. 11 is a schematic diagram of the target detection signal of a critical electrode sheet sample according to some embodiments of the present application;

[0069] FIG. 12 is a SEM detection result corresponding to an eddy current detection NG sample according to some embodiments of the present application;

[0070] FIG. 13 is a SEM detection result corresponding to an eddy current detection OK sample according to some embodiments of the present application;

[0071] FIG. 14 is an artificial peeling verification result corresponding to an eddy current detection OK sample according to some embodiments of the present application;

[0072] FIG. 15 is an artificial peeling verification result corresponding to an eddy current detection NG sample according to some embodiments of the present application;

[0073] FIG. 16 is a schematic diagram of the structure of an electrode sheet defect detection system according to some embodiments of the present application;

[0074] FIG. 17 is a flowchart of an electrode sheet defect detection method according to some embodiments of the present application. DETAILED DESCRIPTION

[0075] Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and claims of this application as well as the above abstract are intended to cover any and all adaptations or variations of well known methods, articles, materials, compositions, and

[0077] 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 "a plurality of" is two or more (including two), unless otherwise explicitly and specifically limited.

[0078] The electrode sheet defect detection device, system and method provided by the embodiments of the present application can be applied to online defect detection application scenarios in the electrode sheet production process, or offline defect detection application scenarios in the electrode sheet production process; of course, it can also be applied to other defect detection application scenarios.

[0079] The quality of the electrode sheet is a key indicator that needs to be strictly controlled in the battery production process, and the quality of the electrode sheet will affect the performance indicators of the battery. Generally, the thickness of the electrode sheet aluminum foil itself is only a few microns to tens of microns, and considering that there may be micro-cracks or false welding during the welding process of the electrode sheet aluminum foil, micro-cracks or false welding will affect the performance indicators of the battery, so it is very important to detect defects of the electrode sheet.

[0080] For ease of understanding, the structure of the electrode sheet is exemplarily introduced in the following embodiments of the present application.

[0081] FIG. 1 is a structural schematic diagram of an electrode sheet provided by an embodiment of the present application, as shown in FIG. 1, the electrode sheet includes a first electrode sheet region A1, a second electrode sheet region A2 and a third electrode sheet region A3. The first electrode sheet region A1 can include but is not limited to a first intermediate layer A11 and a coating layer A12; the second electrode sheet region A2 can include but is not limited to a second intermediate layer A21 and an insulating layer A22; and the third electrode sheet region A3 can include but is not limited to a third intermediate layer A31 and an aluminum sheet A32. It should be understood that the first intermediate layer A11, the second intermediate layer A21 and the third intermediate layer A31 can be an integrated intermediate layer, or can be independent intermediate layers.

[0082] Exemplarily, the aluminum sheet A32 located on the side of the third intermediate layer A31 can be welded by ultrasonic welding to form an ultrasonic welding point A33. Due to high pressure and high frequency vibration generated during welding, micro cracks are easily generated in the welding area and near the welding area. In addition, due to unstable process parameters and other reasons, it is difficult to avoid the occurrence of virtual welding during production.

[0083] 1) When the aluminum sheet A32 in the third tab area A3 has micro cracks, the tab made into a battery cell will be corroded by the electrolyte during the cycle process, and the micro cracks will be corroded most severely by the electrolyte. The micro cracks will rapidly expand until the aluminum layer is completely broken, and finally lead to a sharp drop in the performance of the battery cell. 2) When the ultrasonic welding point A33 in the third tab area A3 has virtual welding, the tab made into a battery cell will affect the performance indicators of the battery cell, resulting in the performance of the battery cell failing to meet the requirements.

[0084] It should be noted that the tab involved in the embodiments of the present application can also use other tab structures (for example, a double-layer aluminum sheet or a three-layer aluminum sheet, etc.). The tab defect detection device according to the embodiments of the present application can detect the surface defects and / or internal defects of the tab of different tab structures.

[0085] In the related art, the tab image is collected by a Charge-Coupled Device (CCD) or X-ray, and the tab defect is detected according to the collected tab image. Since the tab image usually only shows the surface defect of the tab, the related art can only detect the surface defect of the tab, and cannot detect the internal defect of the tab, which has the problem of low detection accuracy.

[0086] In addition, although there are scanning electron microscope, metallographic microscope, infrared thermal imaging, ultrasonic imaging, and magnetic powder methods for defect detection in the defect detection technology, the electron microscope method and the metallographic microscope method have the problem of low detection efficiency, the infrared thermal imaging method has the problem of low detection resolution, the ultrasonic imaging method has the problem of the need for coupling agent and low detection resolution, and the magnetic powder method has the problem of introducing particles.

[0087] It is considered that the strength and distribution of the eddy current in the conductor will change in the case that the conductor has defects (internal defects and / or external defects), therefore, in order to detect the surface defects of the pole piece and the internal defects of the pole piece, the embodiment of the present application proposes that the defect detection of the target detection area can be performed based on the eddy current information of the target detection area of the pole piece to be detected. The eddy current (also known as Foucault current) is an induced current flowing along a closed loop in a substance. This phenomenon is caused by the intersection of a moving magnetic field and a metal conductor, or the perpendicular intersection of a moving metal conductor and a magnetic field. In short, it is the result of electromagnetic induction effect, which produces a circulating current in the conductor.

[0088] For the convenience of understanding, the eddy current detection principle is exemplarily introduced in the following embodiments of the present application.

[0089] Fig. 2 is a schematic diagram of the principle of eddy current detection provided by the embodiment of the present application, as shown in Fig. 2, the eddy current detection is to approach the signal detection assembly with alternating current to the conductor (for example, the pole piece) to be detected, the signal detection assembly will establish an alternating magnetic field, and the conductor to be detected can move along a preset detection path (or referred to as a preset transmission direction). The alternating magnetic field will establish an eddy current in the conductor through electromagnetic induction effect. Further, the eddy current in the conductor will also generate its own eddy current magnetic field, and the action of the eddy current magnetic field will change the strength of the original alternating magnetic field, thereby causing the change of the voltage and / or impedance and other parameters of the signal detection assembly.

[0090] It should be noted that in the case that the conductor has defects, the strength and distribution of the eddy current will change, and the change of the eddy current will cause the change of the voltage and / or impedance and other parameters of the detection assembly, thereby causing the change of the detection signal detected by the signal detection assembly.

[0091] It should be understood that according to the change of the detection signal detected by the detection assembly, the defect condition (internal defect condition and / or external defect condition) of the conductor can be indirectly determined.

[0092] To solve the problem of low defect detection accuracy in the related art, the embodiment of the present application proposes to generate a detection magnetic field by a signal detection component to generate a target eddy current in a target detection area of the to-be-tested pole piece, and generate a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field generated by the target eddy current; further, the defect detection of the target detection area is performed by the detection control component according to the target detection signal sent by the signal detection component. Compared with the defect detection method based on the pole piece image in the related art, the defect detection of the target detection area in the embodiment of the present application is performed based on the target detection signal generated by the signal detection component. Since the target detection signal can be used to indicate the surface defect condition and / or internal defect condition of the target detection area of the to-be-tested pole piece, the embodiment of the present application can not only detect the surface defects of the pole piece, but also detect the internal defects of the pole piece other than the surface. Therefore, the defect detection accuracy of the embodiment of the present application is higher.

[0093] For example, the defects involved in the embodiment of the present application can include but are not limited to at least one of the following: crack defects, virtual welding defects, concave-convex defects. The crack defects can include but are not limited to micro-cracks.

[0094] In some embodiments, FIG. 3 is a structural schematic diagram of a pole piece defect detection device provided by some embodiments of the present application. As shown in FIG. 3, the pole piece defect detection device in the embodiment of the present application can include a detection control component 30 and a signal detection component 31 connected with the detection control component 30.

[0095] The signal detection component 31 in the embodiment of the present application can be arranged on one side of the target detection area of the to-be-tested pole piece E. For example, the target detection area can include but is not limited to a defect area in the to-be-tested pole piece which has a greater impact on the performance of the battery cell. For example, the target detection area can include but is not limited to a sub-area between the ultrasonic welding point A33 in the second pole piece area A2 and the third pole piece area A3 in FIG. 1. For another example, the target detection area can include but is not limited to the third pole piece area A3 in FIG. 1. For another example, the target detection area can include but is not limited to all areas of the to-be-tested pole piece.

[0096] It should be noted that the target detection area in the embodiment of the present application can also be adaptively adjusted according to specific detection requirements, which will not be illustrated one by one in the embodiment of the present application.

[0097] For example, as shown in FIG. 3, the signal detection component 31 can be arranged above the target detection area of the to-be-tested pole piece E. For another example, the signal detection component 31 can be arranged below the target detection area of the to-be-tested pole piece E.

[0098] The signal detection component 31 in the embodiment of the present application can be used to generate a detection magnetic field, wherein the detection magnetic field can be used to generate a target eddy current in the target detection area of the to-be-tested pole piece E.

[0099] In the embodiment of the present application, since the to-be-tested pole piece E can move along the preset driving direction, under the excitation of the detection magnetic field, the target detection area of the to-be-tested pole piece E can generate a target eddy current. The target eddy current can generate a corresponding eddy current magnetic field.

[0100] The signal detection assembly 31 in the embodiment of the present application can also be used to generate a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field, wherein the eddy current magnetic field is a magnetic field generated by the target eddy current.

[0101] Generally, the change of the target eddy current can cause the change of the eddy current magnetic field, the change of the eddy current magnetic field can cause the change of the strength of the detection magnetic field, and the change of the strength of the detection magnetic field can cause the change of the voltage and / or impedance and other parameters of the signal detection assembly 31, so as to cause the change of the target detection signal generated by the signal detection assembly 31. It should be understood that the change of the target detection signal and the target eddy current involved in the embodiment of the present application is positively correlated.

[0102] It should be noted that in the case that the target detection area of the to-be-tested pole piece has a crack defect and / or a false welding and the like, the strength and distribution of the target eddy current can change, the change of the target eddy current can cause the change of the voltage and / or impedance and other parameters of the signal detection assembly 31, so as to cause the change of the target detection signal generated by the signal detection assembly 31. Therefore, the target detection signal generated by the signal detection assembly 31 in the embodiment of the present application can be used to indicate the surface defect condition and / or internal defect condition of the target detection area of the to-be-tested pole piece, so that the target detection signal can be sent to the detection control assembly 30, so that the detection control assembly 30 can perform defect detection according to the target detection signal.

[0103] The detection control assembly 30 in the embodiment of the present application can be used to receive the target detection signal output by the signal detection assembly 31, and perform defect detection on the target detection area according to the target detection signal.

[0104] Considering that the target detection signal can be used to indicate the surface defect condition and / or internal defect condition of the target detection area of the to-be-tested pole piece, the detection control assembly 30 in the embodiment of the present application can perform defect detection on the target detection area according to the target detection signal sent by the signal detection assembly 31, and obtain a defect detection result. The defect detection result can include but is not limited to at least one of the following: defect indication information, defect type information, and defect degree information. The defect indication information can be used to indicate whether there is a defect area in the target detection area, the defect type information can include but is not limited to a crack defect type and / or a false welding defect type, and the defect degree information is used to indicate the defect degree corresponding to the defect area in the target detection area.

[0105] In a possible implementation, the detection control component 30 can be specifically configured to: determine the defect degree of the target detection region according to the signal strength of the target detection signal and the signal strength threshold corresponding to the different defect degrees of different defect types.

[0106] In the implementation, the detection control component 30 can pre-store the signal strength threshold corresponding to the different defect degrees of different defect types. For example, the detection control component 30 can pre-receive the signal strength threshold corresponding to the different defect degrees of different defect types from other devices. For another example, the detection control component 30 can determine the signal strength threshold corresponding to the different defect degrees of different defect types by analyzing the defect degrees of a plurality of reference pole pieces and the signal strength of the detection signal. Of course, the detection control component 30 can also obtain the signal strength threshold corresponding to the different defect degrees of different defect types in other manners.

[0107] For example, the detection control component 30 can pre-store the signal strength threshold 1 corresponding to the first crack defect degree, the signal strength threshold 2 corresponding to the second crack defect degree, the signal strength threshold 3 corresponding to the first virtual welding defect degree, and the signal strength threshold 4 corresponding to the second virtual welding defect degree. The signal strength threshold 1 is less than the signal strength threshold 2, and the signal strength threshold 3 is less than the signal strength threshold 4. It should be noted that the relationship between the signal strength threshold 2 and the signal strength threshold 3 is indefinite and can be determined according to actual conditions.

[0108] In the implementation, the detection control component 30 can determine the target signal strength threshold corresponding to the signal strength of the target detection signal by comparing the signal strength of the target detection signal with the signal strength threshold corresponding to the different defect degrees, and take the defect degree corresponding to the target signal strength threshold as the defect degree of the target detection region.

[0109] For example, if the signal strength of the target detection signal is greater than the signal strength threshold 1 and less than the signal strength threshold 2, the detection control component 30 can determine that the target signal strength threshold corresponding to the signal strength of the target detection signal is the signal strength threshold 1, and take the first crack defect degree corresponding to the signal strength threshold 1 as the defect degree of the target detection region.

[0110] For another example, if the signal strength of the target detection signal is greater than the signal strength threshold 3 and less than the signal strength threshold 4, the detection control component 30 can determine that the target signal strength threshold corresponding to the signal strength of the target detection signal is the signal strength threshold 3, and take the first virtual welding defect degree corresponding to the signal strength threshold 3 as the defect degree of the target detection region.

[0111] It should be noted that if the signal strength of the target detection signal is less than the minimum preset signal strength threshold, the detection control component 30 can determine that the target detection area does not have a defect area.

[0112] It can be seen that in the present embodiment, the detection control component 30 can simply and accurately determine the defect degree of the target detection area by determining the defect degree of the target detection area according to the signal strength of the target detection signal and the signal strength threshold corresponding to the preset different defect degrees, thereby facilitating the improvement of the accuracy of defect detection.

[0113] In another possible implementation, the detection control component 30 can be specifically configured to determine the defect degree of the target detection area according to the signal strength of the target detection signal and the signal strength threshold range corresponding to the preset different defect degrees.

[0114] In the present embodiment, the detection control component 30 can pre-store the signal strength threshold range corresponding to the different defect degrees of different defect types.

[0115] In the present embodiment, the detection control component 30 can compare the signal strength of the target detection signal with the preset signal strength threshold range corresponding to the different defect degrees, determine the target signal strength threshold range to which the signal strength of the target detection signal belongs, and take the defect degree corresponding to the target signal strength threshold range as the defect degree of the target detection area.

[0116] In another possible implementation, the detection control component 30 can input the signal strength of the target detection signal into a preset defect detection model to obtain the defect degree of the target detection area output by the preset defect detection model, wherein the preset defect detection model can include but is not limited to a machine learning model.

[0117] Of course, the detection control component 30 can also perform defect detection on the target detection area by other manners according to the target detection signal.

[0118] In summary, the pole piece defect detection device in the embodiment of the present application comprises a detection control component and a signal detection component. The signal detection component is configured to generate a detection magnetic field, and the detection magnetic field is configured to generate a target eddy current in a target detection area of the pole piece to be detected. The signal detection component is further configured to generate a target detection signal under the joint excitation of the detection magnetic field and an eddy current magnetic field generated by the target eddy current. The detection control component is configured to receive the target detection signal output by the signal detection component and perform defect detection on the target detection area according to the target detection signal. In the embodiment of the present application, the signal detection component generates a detection magnetic field to generate a target eddy current in a target detection area of the pole piece to be detected, and generates a target detection signal under the joint excitation of the detection magnetic field and an eddy current magnetic field generated by the target eddy current. Further, the detection control component performs defect detection on the target detection area according to the target detection signal sent by the signal detection component. Compared with the defect detection method based on the pole piece image in the related art, the defect detection on the target detection area is performed based on the target detection signal generated by the signal detection component in the embodiment of the present application. Since the target detection signal can be used to indicate the surface defect condition and / or internal defect condition of the target detection area of the pole piece to be detected, the embodiment of the present application can not only detect the surface defects of the pole piece, but also detect the internal defects of the pole piece other than the surface. Therefore, the accuracy of the defect detection in the embodiment of the present application is higher.

[0119] In some embodiments, on the basis of the above-mentioned embodiments, the present application exemplarily introduces the signal intensity threshold values corresponding to different defect degrees of different defect types.

[0120] For ease of understanding, the crack defect type and the virtual welding defect type are taken as examples for introduction and description in the embodiments of the present application

[0121] 1) Signal intensity threshold values corresponding to different defect degrees of the virtual welding defect type

[0122] A plurality of first reference pole pieces of a first preset length are selected, wherein the plurality of first reference pole pieces can include but are not limited to standard pole pieces (pole pieces without defects) and first defect pole pieces with different virtual welding defect degrees. Further, first reference detection signals corresponding to the plurality of first reference pole pieces are respectively acquired by the signal detection component, and each first reference detection signal is respectively associated with a corresponding first defect pole piece to obtain signal intensities of detection signals corresponding to different virtual welding defect degrees. Further, the signal intensity threshold values corresponding to different virtual welding defect degrees are determined according to the signal intensities of the detection signals corresponding to the critical reference pole pieces.

[0123] 2) Signal intensity threshold values corresponding to different defect degrees of the crack defect type

[0124] The second reference pole pieces can include, but are not limited to, standard pole pieces (pole pieces without defects) and second defect pole pieces with different crack defect degrees. Further, second reference detection signals corresponding to the second reference pole pieces are obtained by the signal detection assembly, and each second reference detection signal is respectively associated with a corresponding second defect pole piece to obtain signal strengths of detection signals corresponding to different crack defect degrees. The crack defect degree of each second defect pole piece can be accurately determined by performing scanning electron microscope (SEM) analysis on the defect region of each second defect pole piece. Further, the signal strength threshold corresponding to different crack defect degrees is determined according to the signal strength of the detection signal corresponding to each critical reference pole piece.

[0125] In some embodiments, FIG. 4 is a structural schematic diagram of a signal detection assembly provided by some embodiments of the present application. Based on the above embodiments, the signal detection assembly is exemplarily introduced and described in some embodiments of the present application. As shown in FIG. 4, the signal detection assembly 31 in some embodiments of the present application can include a detection coil 310. The detection coil 310 can be connected with an external excitation power source, so that it can receive an electrical signal input by the external excitation power source. The detection coil 310 can also be connected with a detection control assembly 30, so that it can transmit signals with the detection control assembly 30. The electrical signal input by the external excitation power source can be an alternating current signal.

[0126] The detection coil 310 can be used to generate a detection magnetic field under the excitation of the electrical signal input by the external excitation power source, and to generate a target detection signal under the joint excitation of the detection magnetic field and an eddy current magnetic field, and to output the target detection signal to the detection control assembly 30 through the connection between the detection coil 310 and the detection control assembly 30.

[0127] In some embodiments of the present application, the electrical signal input by the external excitation power source is an alternating current signal. The detection coil 310 in the signal detection assembly 31 can generate a detection magnetic field under the excitation of the alternating current signal, so as to generate a target eddy current in the target detection region of the pole piece E to be detected. Further, the detection coil 310 can generate a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field generated by the target eddy current, and send the target detection signal to the detection control assembly 30, so that the detection control assembly 30 can detect defects in the target detection region according to the target detection signal.

[0128] In the embodiment of the present application, the signal detection assembly is provided with a detection coil connected with the external excitation power supply and the detection control assembly respectively. The detection coil generates a detection magnetic field under the excitation of the electrical signal input by the external excitation power supply, and generates a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field, and outputs the target detection signal to the detection control assembly. It can be seen that, in the embodiment of the present application, the detection coil in the signal detection assembly generates a detection magnetic field, and generates a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field. On the basis of the simple structure of the signal detection assembly, the detection of the target detection signal can be realized, which not only saves the space occupied by the components, but also saves the cost of the components.

[0129] In some embodiments, Figure 5 is a structural schematic diagram of a signal detection assembly provided by another embodiment of the present application. On the basis of the above-mentioned embodiment, considering that there may be a jitter condition in the pole piece conveying process, in order to prevent the signal detection assembly from scratching the to-be-detected pole piece, the signal detection assembly 31 in the embodiment of the present application can be provided with a ball 312 on the side facing the to-be-detected pole piece.

[0130] As shown in Figure 5, the signal detection assembly 31 in the embodiment of the present application can include a shell 311, wherein the detection coil 310 can be arranged in the accommodating cavity formed by the shell 311. Exemplarily, the material of the shell 311 can include but is not limited to an insulating material.

[0131] In the embodiment of the present application, by arranging the detection coil 310 in the accommodating cavity formed by the shell 311, not only the detection coil can be protected, but also the safety of the detection assembly 31 can be improved.

[0132] The signal detection assembly 31 in the embodiment of the present application can also include a ball 312, which can be arranged on the mounting portion of the side of the shell 311 facing the to-be-detected pole piece. Exemplarily, the ball 312 can include but is not limited to a movable spherical ball.

[0133] In the embodiment of the present application, by arranging the ball on the mounting portion of the side of the shell 311 facing the to-be-detected pole piece, in the case that the spacing distance between the signal detection assembly 31 and the to-be-detected pole piece is close enough, the to-be-detected pole piece will not be scratched by the signal detection assembly 31 due to its own jitter, thereby facilitating the protection of the to-be-detected pole piece.

[0134] In some embodiments, Figure 6 is a structural schematic diagram of a signal detection assembly provided by another embodiment of the present application. As shown in Figure 6, the signal detection assembly 31 in the embodiment of the present application can adopt the structure of a pen-type detection probe, which not only facilitates the fixation of the signal detection assembly, but also further saves the component space.

[0135] Of course, the signal detection assembly 31 in the embodiments of the present application can also adopt other forms of probe structures other than the pen-type detection probe, and the embodiments of the present application will not be repeated here.

[0136] In some embodiments, FIG. 7 is a structural schematic diagram of a pole piece defect detection device provided by another embodiment of the present application. Considering that there can be a jitter condition (or referred to as a fluctuation condition) in the pole piece conveying process, in order to make the signal detection assembly 31 always located at one side of the target detection area of the pole piece to be detected in the detection process, the pole piece defect detection device of the embodiment of the present application can also include a moving mechanism 32 electrically connected with the detection control assembly 30. Wherein, the moving mechanism 32 and the detection assembly 31 can be mechanically connected.

[0137] For example, the moving mechanism 32 can be used to drive the signal detection assembly 31 to move under the control of the detection control assembly 30.

[0138] In the embodiments of the present application, the detection control assembly 30 can control the moving mechanism 32 to drive the signal detection assembly 31 to move according to the jitter condition in the pole piece conveying process, so that the signal detection assembly 31 is always located at one side of the target detection area of the pole piece to be detected in the detection process. This can avoid the target detection area of the pole piece to be detected exceeding the effective detection range of the detection control assembly 30, so as to realize the defect detection of the target detection area.

[0139] For example, assuming that there is a jitter condition along the first direction D1 in the pole piece conveying process, the detection control assembly 30 can control the moving mechanism 32 to drive the signal detection assembly 31 to move along the first direction D1, so that the signal detection assembly 31 is always located at one side of the target detection area of the pole piece to be detected in the detection process. Wherein, the first direction D1 can be a direction parallel to the plane where the pole piece to be detected is located, and perpendicular to the conveying direction of the pole piece to be detected.

[0140] For another example, assuming that there is a jitter condition along the second direction D2 in the pole piece conveying process, the detection control assembly 30 can control the moving mechanism 32 to drive the signal detection assembly 31 to move along the second direction D2. Wherein, the second direction D2 can be a direction perpendicular to the plane where the pole piece to be detected is located.

[0141] Of course, in the case of a jitter condition in other directions in the pole piece conveying process, the moving mechanism 32 can drive the signal detection assembly 31 to move following the jitter condition.

[0142] To sum up, in the electrode sheet defect detection device, the signal detection assembly is driven to move by the moving mechanism under the control of the detection control assembly, so that the signal detection assembly is always located on one side of the target detection area of the electrode sheet to be detected during the detection, that is, the target detection area of the electrode sheet to be detected always belongs to the effective detection range of the signal detection assembly, thereby facilitating further improvement of the accuracy of defect detection of the target detection area.

[0143] In some embodiments, FIG. 8 is a structural diagram of an electrode sheet defect detection device provided by another embodiment of the present application. On the basis of the above-mentioned embodiment, the present embodiment makes an exemplary introduction to the related content of the moving mechanism 32. As shown in FIG. 8, the moving mechanism 32 in the present embodiment can include a first moving assembly 320 and a second moving assembly 321. Exemplarily, any moving assembly involved in the present embodiment can include but is not limited to a servo module or a hydraulic module.

[0144] The first moving assembly 320 in the present embodiment can be used to drive the signal detection assembly 31 to move along the first direction D1 under the control of the detection control assembly 30, so that the signal detection assembly 31 is always located on one side of the target detection area of the electrode sheet to be detected during the detection, that is, the target detection area of the electrode sheet to be detected always belongs to the effective detection range of the signal detection assembly, thereby facilitating further improvement of the accuracy of defect detection of the target detection area.

[0145] Exemplarily, the first direction D1 can be a direction parallel to the plane where the electrode sheet to be detected is located and perpendicular to the driving direction of the electrode sheet to be detected. For example, the driving direction of the electrode sheet to be detected can be the direction of the X-axis of the coordinate axis in FIG. 8, and the first direction D1 can be the direction of the Y-axis of the coordinate axis in FIG. 8 (or the width direction of the electrode sheet to be detected).

[0146] In a possible implementation, the first moving assembly 320 in the present embodiment can include but is not limited to a first sliding rail arranged along the first direction and a first driving assembly, wherein the first driving assembly can drive the signal detection assembly 31 slidably arranged on the first sliding rail to move along the first sliding rail under the control of the detection control assembly 30.

[0147] In another possible implementation, the first moving assembly 320 in the present embodiment can include but is not limited to a first sliding rail arranged along the first direction and a first driving assembly, wherein the first driving assembly can drive the first sliding rail to move under the control of the detection control assembly 30, so as to drive the signal detection assembly 31 fixedly arranged on the first sliding rail to move along the first sliding rail.

[0148] Of course, the first moving assembly 320 can also move the signal detection assembly 31 along the first direction D1 under the control of the detection control assembly 30 in other manners.

[0149] The second moving assembly 321 in the embodiments of the present application can be used to move the signal detection assembly 31 along the second direction D2 under the control of the detection control assembly 30, so that the interval distance between the signal detection assembly 31 and the to-be-tested electrode sheet can meet the preset detection distance, thereby facilitating further improvement of the accuracy of defect detection.

[0150] For example, the second direction D2 can be a direction perpendicular to the plane where the to-be-tested electrode sheet is located. For example, the second direction can be the direction of the Z-axis of the coordinate axis in FIG. 8.

[0151] In a possible implementation, the second moving assembly 321 in the embodiments of the present application can include but is not limited to a second sliding rail arranged along the second direction and a second driving assembly, wherein the second driving assembly can move the signal detection assembly 31 slidably arranged on the second sliding rail along the second sliding rail under the control of the detection control assembly 30.

[0152] In another possible implementation, the second moving assembly 321 in the embodiments of the present application can include but is not limited to a second sliding rail arranged along the second direction and a second driving assembly, wherein the second driving assembly can move the second sliding rail under the control of the detection control assembly 30 to move the signal detection assembly 31 fixedly arranged on the second sliding rail along the second sliding rail.

[0153] Of course, the second moving assembly 321 can also move the signal detection assembly 31 along the second direction D2 under the control of the detection control assembly 30 in other manners.

[0154] It should be understood that the detection control assembly 30 can be arranged on the second moving assembly 321, and the second moving assembly 321 can be arranged on the first moving assembly 320, so as to move the signal detection assembly 31 along the first direction D1 and / or along the second direction D2.

[0155] In summary, in the embodiments of the present application, the moving mechanism includes the first moving assembly that can move the signal detection assembly along the first direction and the second moving assembly that can move the signal detection assembly along the second direction, which can flexibly control the position of the signal detection assembly, not only can make the target detection area of the to-be-tested electrode sheet always belong to the effective detection range of the signal detection assembly, but also can make the interval distance between the signal detection assembly and the to-be-tested electrode sheet meet the preset detection distance, thereby facilitating further improvement of the accuracy of defect detection in the target detection area.

[0156] In some embodiments, based on the above-mentioned embodiments, in order to accurately control the signal detection assembly 31 to move based on the fluctuation of the pole piece conveying process, the pole piece defect detection device in the embodiments of the present application can further comprise a fluctuation detection assembly 33.

[0157] The fluctuation detection assembly 33 in the embodiments of the present application can be arranged near the first transmission position P1 of the pole piece transmission mechanism (not shown in FIG. 8), and the signal detection assembly 31 can be arranged near the second transmission position P2 of the pole piece transmission mechanism. Wherein, the pole piece transmission mechanism can drive the to-be-tested pole piece in the direction from the first transmission position P1 to the second transmission position P2. Exemplarily, the pole piece transmission mechanism can include but is not limited to a plurality of rollers.

[0158] The fluctuation detection assembly 33 in the embodiments of the present application can be used to detect the position fluctuation information of the target detection area of the to-be-tested pole piece in the first direction D1 when the pole piece transmission mechanism drives the target detection area of the to-be-tested pole piece to the first transmission position P1, and send the position fluctuation information to the detection control assembly 30. Wherein, the position fluctuation information can include but is not limited to at least one of the following: fluctuation indication information, fluctuation direction information, fluctuation distance information. Wherein, the fluctuation indication information can be used to indicate whether there is a position fluctuation when the target detection area of the to-be-tested pole piece is driven to the first transmission position P1, the fluctuation direction information can be used to indicate the fluctuation direction in the first direction D1 when the target detection area of the to-be-tested pole piece is driven to the first transmission position P1, and the fluctuation distance information can be used to indicate the fluctuation distance in the first direction D1 when the target detection area of the to-be-tested pole piece is driven to the first transmission position P1.

[0159] In a possible implementation manner, the fluctuation detection assembly 33 can obtain the first detection position information of the target detection area of the to-be-tested pole piece when the pole piece transmission mechanism drives the target detection area to pass through the first transmission position P1, and compare the first detection position information with the preset first reference position information to determine the position fluctuation information of the target detection area in the first direction D1.

[0160] In another possible implementation manner, the fluctuation detection assembly 33 can obtain the second detection position information of the to-be-tested pole piece when the pole piece transmission mechanism drives the target detection area of the to-be-tested pole piece to pass through the first transmission position P1, and compare the second detection position information with the preset second reference position information to determine the position fluctuation information of the to-be-tested pole piece in the first direction D1, wherein the position fluctuation information of the to-be-tested pole piece in the first direction D1 is the same as the position fluctuation information of the target detection area in the first direction D1.

[0161] Exemplarily, the fluctuation detection component 33 in the embodiments of the present application can include but is not limited to an image acquisition device, so that the first detection position information or the second detection position information can be determined according to the image information of the target detection area of the to-be-tested pole piece when the pole piece transmission mechanism drives the target detection area to pass through the first transmission position P1.

[0162] Further exemplarily, the fluctuation detection component 33 in the embodiments of the present application can include but is not limited to a position detection sensor, so that the first detection position information or the second detection position information can be determined according to the position detection information of the target detection area of the to-be-tested pole piece when the pole piece transmission mechanism drives the target detection area to pass through the first transmission position P1.

[0163] The detection control component 30 in the embodiments of the present application can be used to control the movement mechanism 32 to drive the signal detection component 31 to move in the first direction D1 based on the position fluctuation information when the pole piece transmission mechanism drives the target detection area to the second transmission position P2, wherein the first direction D1 can be a direction parallel to the plane where the to-be-tested pole piece is located and perpendicular to the transmission direction of the to-be-tested pole piece.

[0164] In the embodiments of the present application, the detection control component 30 controls the movement mechanism 32 to drive the signal detection component 31 to move in the first direction D1 based on the position fluctuation information of the target detection area in the first direction D1 when the pole piece transmission mechanism drives the target detection area to the second transmission position P2, so that the signal detection component 31 can move synchronously with the to-be-tested pole piece or the target detection area, that is, the signal detection component 31 can keep “relative static” with the to-be-tested pole piece or the target detection area in the first direction D1, that is, the target detection area of the to-be-tested pole piece always belongs to the effective detection range of the signal detection component 31, thereby facilitating to further improve the accuracy of defect detection of the target detection area.

[0165] Exemplarily, the detection control component 30 can be specifically used to determine the time when the target detection area is driven to the second transmission position according to the time when the target detection area is driven to the first transmission position, the distance between the first transmission position and the second transmission position, and the transmission speed of the to-be-tested pole piece.

[0166] In the embodiments of the present application, the detection control component 30 can determine the time t2 when the target detection area is driven to the second transmission position P2 according to the time t1 when the target detection area is driven to the first transmission position P1, the distance L between the first transmission position P1 and the second transmission position P2, and the transmission speed v of the to-be-tested pole piece.

[0167] In a possible implementation, the detection control component 30 can determine the transmission time t3 according to the distance L between the first transmission position P1 and the second transmission position P2 and the transmission speed v of the to-be-tested pole piece, and determine the time t2 when the target detection area is driven to the second transmission position P2 according to the time t1 when the target detection area is driven to the first transmission position P1 and the transmission time t3.

[0168] In this implementation, the detection control component 30 can obtain the transmission time t3 by dividing the distance L between the first transmission position P1 and the second transmission position P2 by the transmission speed v of the to-be-tested pole piece.

[0169] Further, the detection control component 30 can determine the time t2 when the target detection area is driven to the second transmission position P2 according to the time t1 when the target detection area is driven to the first transmission position P1 and the transmission time t3 by using the following formula (1). t2=t1+t3 Formula (1)

[0170] Of course, the detection control component 30 can also determine the time t2 when the target detection area is driven to the second transmission position P2 according to the time t1 when the target detection area is driven to the first transmission position P1 and the transmission time t3 by using other transformed formulas or equivalent formulas of the above formula (1).

[0171] To sum up, in this implementation, the time when the target detection area is driven to the second transmission position P2 can be accurately determined by determining the transmission time according to the distance between the first transmission position and the second transmission position and the transmission speed of the to-be-tested pole piece, and determining the time when the target detection area is driven to the second transmission position according to the time when the target detection area is driven to the first transmission position and the transmission time, so that the signal detection component can be accurately driven to move in the first direction.

[0172] In another possible implementation, the detection control component 30 can input the time t1 when the target detection area is driven to the first transmission position, the distance L between the first transmission position P1 and the second transmission position P2, and the transmission speed v of the to-be-tested pole piece into a preset transmission time prediction model to obtain the time t2 when the target detection area is driven to the second transmission position P2 output by the preset transmission time prediction model; wherein the preset transmission time prediction model can include but is not limited to a machine learning model.

[0173] Further, the detection control component 30 can be specifically configured to control the mobile mechanism to drive the signal detection component to move in the first direction by a fluctuation distance at the time when the target detection area is driven to the second transmission position according to the fluctuation distance indicated by the position fluctuation information.

[0174] Exemplarily, the detection control component 30 can control the moving mechanism 32 to drive the signal detection component 31 to move in the fluctuation distance in the first direction D1 at the time t2 when the target detection area is driven to the second transmission position P2 according to the fluctuation distance indicated by the position fluctuation information, so that the signal detection component 31 can move synchronously with the target detection area or the to-be-detected pole piece, i.e., the signal detection component 31 can keep "relative static" with the target detection area or the to-be-detected pole piece in the first direction D1.

[0175] Exemplarily, considering that there may be a certain delay in the process of controlling the moving mechanism 32 to move by the control component 30, in the embodiment of the application, the detection control component 30 can determine the triggering moving time t5 according to the difference between the time t2 when the target detection area is driven to the second transmission position P2 and the preset delay time t4, and control the moving mechanism 32 to drive the signal detection component 31 to move in the fluctuation distance in the first direction D1 at the triggering moving time t5, so that the signal detection component 31 can move synchronously with the target detection area or the to-be-detected pole piece, i.e., the signal detection component 31 can keep "relative static" with the target detection area or the to-be-detected pole piece in the first direction D1. The preset delay time t4 can be the delay time corresponding to the control of the moving mechanism 32 by the control component 30.

[0176] In summary, the pole piece defect detection device in the embodiment of the application can detect the position fluctuation information of the target detection area in the first direction when the target detection area is driven to the first transmission position by the pole piece transmission mechanism, and send the position fluctuation information to the detection control component. Further, the detection control component can control the moving mechanism to drive the signal detection component to move in the first direction based on the position fluctuation information when the target detection area is driven to the second transmission position by the pole piece transmission mechanism. It can be seen that, in the embodiment of the application, the fluctuation detection component, the detection control component and the moving mechanism are linked to achieve the purpose of fluctuation following control of the target detection area. Even if there is a jitter in the process of pole piece transmission, the target detection area of the to-be-detected pole piece can always belong to the effective detection range of the signal detection component, so as to facilitate further improving the accuracy of defect detection of the target detection area.

[0177] In some embodiments, on the basis of the above-mentioned embodiments, the detection control component 30 in the embodiment of the application can also be used to send a defect detection result to a production control component, wherein the defect detection result can be used to instruct the production control component to determine whether the pole piece transmission mechanism needs to be stopped based on the defect detection result.

[0178] In the embodiments of the present application, the detection control component 30 sends the defect detection result of the target detection area of the to-be-tested pole piece to the production control component, and the production control component can store the defect detection result of the target detection area of the to-be-tested pole piece. It should be understood that the production control component can store the defect detection result of multiple target detection areas of multiple to-be-tested pole pieces.

[0179] In a possible implementation, in a case where the defect information of the to-be-tested pole piece determined according to the defect detection result satisfies a preset shutdown condition, the production control component can determine that the pole piece transmission mechanism needs to be shut down, so as to make corresponding processing on the to-be-tested pole piece with the defective area, thereby the problem that defective pole pieces flow into subsequent processes, resulting in cost waste and manpower waste can be alleviated, and the problem that risk batteries flow into the market, resulting in the consequence of regrinding estimation can also be alleviated. The preset shutdown condition can include but is not limited to that the total number of the defective areas existing within a preset distance of the to-be-tested pole piece is greater than a preset number threshold, or the defect degree corresponding to any defective area of the to-be-tested pole piece is greater than a preset defect degree threshold.

[0180] In another possible implementation, in a case where the defect information of the to-be-tested pole piece determined according to the defect detection result does not satisfy the preset shutdown condition, the production control component can determine that the pole piece transmission mechanism does not need to be shut down, so as to continue the production preparation process of the pole piece.

[0181] To sum up, in the embodiments of the present application, the detection control component sends the defect detection result to the production control component, so that the production control component determines whether the pole piece transmission mechanism needs to be shut down based on the defect detection result, which can alleviate the problem that defective pole pieces flow into subsequent processes, resulting in cost waste and manpower waste, and can also alleviate the problem that risk batteries flow into the market, resulting in the consequence of regrinding estimation, thereby being conducive to improving the production preparation efficiency of the pole piece and being conducive to improving the performance of the prepared battery.

[0182] In some embodiments, on the basis of the above-mentioned embodiments, the detection control component 30 in the embodiments of the present application can also be used for sending the defect detection result to the marking component, wherein the defect detection result can be used to instruct the marking component to determine whether to make a defect mark in the target detection area based on the defect detection result.

[0183] For example, the detection control component 30 can directly send the defect detection result to the marking component. In another example, the detection control component 30 can send the defect detection result to the marking component through the CCD.

[0184] In the embodiments of the present application, the detection control component 30 sends the defect detection result of the target detection area of the to-be-tested pole piece to the marking component, so that the marking component determines whether to make a defect mark in the target detection area according to the defect detection result of the target detection area of the to-be-tested pole piece.

[0185] In a possible implementation, in a case where the defect detection result indicates that the target detection area of the to-be-tested pole piece has a defect area, the marking assembly can determine to mark the target detection area with a defect mark. For example, the marking assembly can mark the target detection area with different defect marks according to different defect types and / or defect degrees indicated by the defect detection result, so that the defect types and / or defect degrees can be quickly distinguished subsequently.

[0186] In another possible implementation, in a case where the defect detection result indicates that the target detection area of the to-be-tested pole piece does not have a defect area, the marking assembly can determine not to mark the target detection area with a defect mark.

[0187] To sum up, in the embodiments of the present application, the detection control assembly sends the defect detection result to the marking assembly, so that the marking assembly determines whether the target detection area needs to be marked with a defect mark based on the defect detection result. In this way, in a case where any target detection area of the to-be-tested pole piece has a defect area, the corresponding target detection area can be marked with a defect mark, so that the defect area on the to-be-tested pole piece can be quickly located subsequently.

[0188] In some embodiments, FIG. 9 is a structural schematic diagram of a pole piece defect detection device provided by another embodiment of the present application. On the basis of the above-mentioned embodiments, for ease of understanding, in the following embodiments of the present application, the signal detection assembly 31 adopts a pen-type detection probe structure, and the fluctuation detection assembly 33 is an image acquisition device, which are taken as examples to introduce and describe the related content of the pole piece defect detection device of the embodiments of the present application. As shown in FIG. 9, the pole piece defect detection device of the embodiments of the present application can include a detection control assembly 30, a signal detection assembly 31, a moving mechanism 32, and a fluctuation detection assembly 33. The signal detection assembly 31 adopts a pen-type detection probe structure, and the fluctuation detection assembly 33 is an image acquisition device. The mounting part of the signal detection assembly 31 towards the to-be-tested pole piece can be provided with a ball.

[0189] It should be noted that, considering that the to-be-tested pole piece can have a jitter along the first direction D1 during the conveying process, the size of the signal detection assembly 31 along the first direction D1 in the embodiments of the present application can be greater than the size of the target detection area along the first direction D1, so that the target detection area of the to-be-tested pole piece can be prevented from exceeding the effective detection range of the detection control assembly 30 due to the fluctuation of the pole piece along the first direction D1 during the production process.

[0190] Exemplarily, the fluctuation detection component 33 can be arranged near the first transmission position P1 of the pole piece transmission mechanism, and the signal detection component 31 can be arranged near the second transmission position P2 of the pole piece transmission mechanism. The movement mechanism 32 includes a first movement component 320 and a second movement component 321. The detection control component 30 can be arranged on the second movement component 321, and the second movement component 321 can be arranged on the first movement component 320.

[0191] Exemplarily, the signal detection component 31 can be arranged above the roller, the Y-axis of the movement mechanism 32 can be parallel to the roller, the detection surface of the signal detection component 31 can be parallel to the to-be-detected pole piece, the signal detection component 31 can be arranged above the blank area of the to-be-detected pole piece, and the distance between the signal detection component 31 and the to-be-detected pole piece can be less than a preset detection distance (for example, 2 mm).

[0192] It should be understood that, before detection starts, the signal detection component 31 can be moved along the Y-axis direction to ensure that the signal detection component 31 can be arranged above the blank area of the to-be-detected pole piece, and the signal detection component 31 can be moved along the Z-axis direction to ensure that the distance between the signal detection component 31 and the to-be-detected pole piece can be less than the preset detection distance.

[0193] The fluctuation detection component 33 in the embodiment of the present application can monitor the position fluctuation information of the target detection area of the to-be-detected pole piece along the first direction D1 at the first transmission position in real time, and feed back the detected position fluctuation information to the detection control component 30, so that the detection control component 30 can determine the time when the position fluctuation at the first transmission position is transmitted to the second transmission position according to the distance between the first transmission position and the second transmission position and the transmission speed of the to-be-detected pole piece, and control the movement mechanism 32 to drive the signal detection component 31 to move the fluctuation distance in the first direction D1 at the time when the target detection area is transmitted to the second transmission position according to the fluctuation distance indicated by the position fluctuation information, so that the signal detection component 31 can move synchronously with the to-be-detected pole piece or the target detection area, that is, the signal detection component 31 can keep “relative static” with the to-be-detected pole piece or the target detection area in the first direction D1.

[0194] The signal detection component 31 in the embodiment of the present application can generate a detection magnetic field to generate a target eddy current at the target detection area of the to-be-detected pole piece, and generate a target detection signal under the common excitation of the detection magnetic field and the eddy current magnetic field generated by the target eddy current.

[0195] The detection control component 30 in the embodiment of the present application can determine the defect degree of the target detection area according to the target detection signal sent by the signal detection component and the signal intensity threshold corresponding to different defect degrees.

[0196] It should be understood that before the detection starts, the defect reference poles with different crack defect degrees and different fake weld defect degrees can be made by forward production, and the plurality of defect reference poles and the standard pole are sequentially monitored by the signal detection assembly to adjust the detection equipment parameters (for example, the signal amplification multiple and / or the signal intensity threshold and the like), so that the detection signals of the signal detection assembly corresponding to the defect reference poles and the standard pole are different, so that the specification boundary lines of different defect degrees can be determined based on the detection signal feedback of different samples, and after the specification line is determined, the actual distance from the signal detection assembly to the roller is confirmed, which is recorded as "actual initial distance".

[0197] In addition, before each production, it is necessary to confirm whether the effective detection range of the signal detection assembly covers the target detection area of the to-be-tested pole in the detection system and make corresponding adjustment; before each production, the production equipment should be opened to confirm and adjust the actual position of the signal detection assembly to ensure consistency with the "system initial position" and the "actual initial position".

[0198] In summary, in the embodiment of the present application, the defect degree of the target detection area is determined based on the target detection signal generated by the signal detection assembly and the preset signal intensity threshold corresponding to different defect degrees. Since the target detection signal can be used to indicate the surface defect condition and / or internal defect condition of the target detection area of the to-be-tested pole, the embodiment of the present application can not only simply and accurately detect the surface defects of the pole, but also simply and accurately detect the internal defects of the pole. Therefore, the accuracy of the defect detection of the embodiment of the present application is higher. Further, through the linkage of the fluctuation detection assembly, the detection control assembly and the moving mechanism, the fluctuation following control purpose of the target detection area is achieved. Even if there is a jitter condition during the transmission of the pole, the target detection area of the to-be-tested pole can always belong to the effective detection range of the signal detection assembly, thereby facilitating to further improve the accuracy of the defect detection of the target detection area.

[0199] In some embodiments, on the basis of the above-mentioned embodiments, the accuracy of the defect detection of the pole defect detection equipment in the embodiment of the present application is exemplarily introduced and described.

[0200] 1) Test feasibility verification

[0201] The standard pole piece sample and the critical pole piece sample (or referred to as the limit pole piece sample) with virtual welding defects and micro crack defects are detected by using the pole piece defect detection device provided in the embodiments of the present application. FIG. 10 is a schematic diagram of the target detection signal of the standard pole piece sample provided in the embodiments of the present application, and FIG. 11 is a schematic diagram of the target detection signal of the critical pole piece sample provided in the embodiments of the present application. As shown in FIG. 10 and FIG. 11, the target detection signal of the critical pole piece sample exceeds the signal threshold line. After preliminary verification, it is found that the detection of such defects by the eddy current detection method is feasible, and the difference between the target detection signals of the standard pole piece sample and the critical pole piece sample is obvious.

[0202] Verification of overkill and underkill

[0203] The defect pole piece samples with different degrees of micro crack defects are detected by using the pole piece defect detection device provided in the embodiments of the present application. FIG. 12 is the SEM detection result corresponding to the eddy current detection NG sample provided in the embodiments of the present application, and FIG. 13 is the SEM detection result corresponding to the eddy current detection OK sample provided in the embodiments of the present application. As shown in FIG. 12 and FIG. 13, the SEM detection result corresponding to the eddy current detection NG sample detects the micro crack defect, and the SEM detection result corresponding to the eddy current detection OK sample does not detect the crack defect. Therefore, it is shown that the eddy current can effectively detect whether the sample is cracked. Based on the comparison and analysis of the SEM result and the eddy current detection result, it is found that the overkill and underkill rate is 0.

[0204] The defect pole piece samples with different degrees of virtual welding defects are detected by using the pole piece defect detection device provided in the embodiments of the present application. FIG. 14 is the artificial peeling verification result corresponding to the eddy current detection OK sample provided in the embodiments of the present application, and FIG. 15 is the artificial peeling verification result corresponding to the eddy current detection NG sample provided in the embodiments of the present application. As shown in FIG. 14 and FIG. 15, for the eddy current detection NG sample, the welding interface cannot be easily peeled off, and the sample is not virtually welded. For the eddy current detection OK sample, the welding interface can be easily peeled off, and the sample is a virtual welding sample. The eddy current detection result is consistent with the actual state of the sample.

[0205] In some embodiments, FIG. 16 is a structural schematic diagram of a pole piece defect detection system provided in some embodiments of the present application. As shown in FIG. 16, the pole piece defect detection system provided in the embodiments of the present application can include a pole piece transmission mechanism 1601, a production control component 1602 and a pole piece defect detection device 1603. The implementation of the pole piece defect detection device 1603 can refer to the related content in the above-mentioned pole piece defect detection device embodiments of the present application.

[0206] The pole piece defect detection device 1603 can be used to determine the defect detection result of the target detection area of the to-be-detected pole piece, and send the defect detection result to the production control component 1602.

[0207] The production control component 1602 can be used to determine whether the pole piece transmission mechanism 1601 needs to be stopped based on the defect detection result.

[0208] In some embodiments, the pole piece production system can further include a marking component;

[0209] The pole piece defect detection device 1603 can further be used to send the defect detection result to the marking component;

[0210] The marking component can be used to mark defects in the target detection area of the pole piece to be detected according to the defect detection result.

[0211] The pole piece defect detection system in the embodiments of the present application can be implemented in the manner described above with reference to the pole piece defect detection device embodiments of the present application, and has similar implementation principles and technical effects, which will not be described here again.

[0212] In some embodiments, FIG. 17 is a flowchart of a pole piece defect detection method provided by some embodiments of the present application. The pole piece defect detection method of the embodiments of the present application can be applied to the pole piece defect detection device in the pole piece defect detection device embodiments of the present application. As shown in FIG. 17, the method of the embodiments of the present application can include the following steps:

[0213] In step S1701, the signal detection component in the pole piece defect detection device generates a detection magnetic field and generates a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field; wherein the detection magnetic field is used to generate a target eddy current in the target detection area of the pole piece to be detected, and the eddy current magnetic field is a magnetic field generated by the target eddy current.

[0214] In step S1702, the detection control component in the pole piece defect detection device receives the target detection signal output by the signal detection component, and performs defect detection on the target detection area according to the target detection signal.

[0215] In some embodiments, the detection control component performs defect detection on the target detection area according to the target detection signal, including:

[0216] The detection control component determines the defect degree of the target detection area according to the signal intensity of the target detection signal and the signal intensity threshold corresponding to the different defect degrees preset by the detection control component.

[0217] The detection control component determines the defect degree of the target detection area according to the signal intensity of the target detection signal and the signal intensity threshold corresponding to the different defect degrees preset by the detection control component.

[0218] In some embodiments, the signal detection component includes a detection coil connected with an external excitation power supply and connected with the detection control component; the signal detection component generates a detection magnetic field and generates a target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field, including:

[0219] The detection coil generates a detection magnetic field under excitation of an external excitation power input electric signal, and is used to generate a target detection signal under joint excitation of the detection magnetic field and an eddy current magnetic field, and output the target detection signal to the detection control assembly through a connection between the detection coil and the detection control assembly.

[0220] In some embodiments, the signal detection assembly comprises a housing, and the detection coil is arranged in a receiving cavity formed by the housing.

[0221] The signal detection assembly further comprises a ball arranged on a mounting portion of a side of the housing facing the to-be-detected pole piece.

[0222] In some embodiments, the pole piece defect detection device further comprises a moving mechanism, and the method further comprises:

[0223] The moving mechanism moves the signal detection assembly under control of the detection control assembly.

[0224] In some embodiments, the moving mechanism comprises a first moving assembly and a second moving assembly, and the moving mechanism moves the signal detection assembly under control of the detection control assembly, comprising:

[0225] The first moving assembly moves the signal detection assembly in a first direction under control of the detection control assembly.

[0226] The second moving assembly moves the signal detection assembly in a second direction under control of the detection control assembly, wherein the first direction is parallel to a plane in which the to-be-detected pole piece is located and perpendicular to a transmission direction of the to-be-detected pole piece, and the second direction is perpendicular to the plane in which the to-be-detected pole piece is located.

[0227] In some embodiments, the pole piece defect detection device further comprises a fluctuation detection assembly, the fluctuation detection assembly is arranged near a first transmission position of the pole piece transmission mechanism, the signal detection assembly is arranged near a second transmission position of the pole piece transmission mechanism, and the pole piece transmission mechanism transmits the to-be-detected pole piece in a direction from the first transmission position to the second transmission position, and the method further comprises:

[0228] The fluctuation detection assembly detects position fluctuation information of the target detection area in the first direction when the pole piece transmission mechanism transmits the target detection area to the first transmission position, and sends the position fluctuation information to the detection control assembly.

[0229] The detection control assembly controls the moving mechanism to move the signal detection assembly in the first direction based on the position fluctuation information when the pole piece transmission mechanism transmits the target detection area to the second transmission position, and the first direction is parallel to a plane in which the to-be-detected pole piece is located and perpendicular to a transmission direction of the to-be-detected pole piece.

[0230] In some embodiments, the detection control component controls the moving mechanism to drive the signal detection component to move in the first direction based on the position fluctuation information when the pole piece transmission mechanism drives the target detection area to the second transmission position, including:

[0231] The detection control component determines the time when the target detection area is driven to the second transmission position according to the time when the target detection area is driven to the first transmission position, the distance between the first transmission position and the second transmission position, and the transmission speed of the to-be-detected pole piece.

[0232] The detection control component controls the moving mechanism to drive the signal detection component to move in the first direction by the fluctuation distance at the time when the target detection area is driven to the second transmission position according to the fluctuation distance indicated by the position fluctuation information.

[0233] In some embodiments, the detection control component determines the time when the target detection area is driven to the second transmission position according to the time when the target detection area is driven to the first transmission position, the distance between the first transmission position and the second transmission position, and the transmission speed of the to-be-detected pole piece, including:

[0234] The detection control component determines the transmission duration according to the distance between the first transmission position and the second transmission position and the transmission speed of the to-be-detected pole piece.

[0235] The detection control component determines the time when the target detection area is driven to the second transmission position according to the time when the target detection area is driven to the first transmission position and the transmission duration.

[0236] In some embodiments, the method further includes:

[0237] The detection control component sends the defect detection result to the production control component; wherein the defect detection result is used to instruct the production control component to determine whether the pole piece transmission mechanism needs to be stopped based on the defect detection result.

[0238] In some embodiments, the method further includes:

[0239] The detection control component sends the defect detection result to the marking component, wherein the defect detection result is used to instruct the marking component to determine whether a defect mark needs to be made on the target detection area based on the defect detection result.

[0240] The implementation manners of each step in the pole piece defect detection method in the embodiments of the present application can refer to the related contents in the above-mentioned pole piece defect detection device embodiments of the present application, which have similar implementation principles and technical effects, and will not be described here.

[0241] It should be understood that, although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the indication of the arrows. Unless explicitly stated herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowcharts involved in the above embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0242] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; 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 be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pole piece defect detection apparatus, wherein, The pole piece defect detection device comprises a detection control component and a signal detection component; The signal detection component is configured to generate a detection magnetic field, which is used to generate a target eddy current in a target detection area of a pole piece to be detected. The signal detection component is further configured to generate a target detection signal under the joint excitation of the detection magnetic field and an eddy current magnetic field generated by the target eddy current. The detection control component is configured to receive the target detection signal output by the signal detection component and perform defect detection on the target detection area according to the target detection signal.

2. The pole piece defect detection apparatus according to claim 1, wherein The detection control component is specifically configured to: determine the defect degree of the target detection area according to the signal intensity of the target detection signal and a signal intensity threshold corresponding to a preset defect degree.

3. The pole piece defect detection apparatus according to claim 1 or 2, wherein The signal detection component comprises a detection coil connected to an external excitation power source and connected to the detection control component. The detection coil is configured to generate the detection magnetic field under the excitation of an electric signal input by the external excitation power source, generate the target detection signal under the joint excitation of the detection magnetic field and the eddy current magnetic field, and output the target detection signal to the detection control component through the connection between the detection coil and the detection control component.

4. The pole piece defect detection apparatus according to claim 3, wherein The signal detection component comprises a housing, and the detection coil is arranged in an accommodating cavity formed in the housing. The signal detection component further comprises a ball arranged on a mounting portion on a side of the housing facing the pole piece to be detected.

5. The pole piece defect detection apparatus according to any one of claims 1-4, wherein, The pole piece defect detection device further comprises a moving mechanism. The moving mechanism is configured to move the signal detection component under the control of the detection control component.

6. The pole piece defect detection apparatus according to claim 5, wherein The moving mechanism comprises a first moving component and a second moving component. The first moving component is configured to move the signal detection component in a first direction under the control of the detection control component. The second moving component is configured to move the signal detection component in a second direction under the control of the detection control component.

7. The pole piece defect detection apparatus according to claim 5, wherein The first direction is parallel to the plane in which the pole piece to be detected lies and perpendicular to the transmission direction of the pole piece to be detected, and the second direction is perpendicular to the plane in which the pole piece to be detected lies. The pole piece defect detection device further comprises a fluctuation detection component arranged near a first transmission position of a pole piece transmission mechanism, and the signal detection component is arranged near a second transmission position of the pole piece transmission mechanism. The fluctuation detection component is configured to detect position fluctuation information of the target detection area in the first direction when the pole piece transmission mechanism transmits the target detection area to the first transmission position, and send the position fluctuation information to the detection control component. The detection control component is configured to control the moving mechanism to drive the signal detection component to move in the first direction based on the position fluctuation information when the pole piece transmission mechanism drives the target detection area to the second transmission position, the first direction being parallel to a plane in which the to-be-detected pole piece is located and perpendicular to a transmission direction of the to-be-detected pole piece.

8. The pole piece defect detection apparatus according to claim 7, wherein The detection control component is specifically configured to: determine a time when the target detection area is driven to the second transmission position according to a time when the target detection area is driven to the first transmission position, a distance between the first transmission position and the second transmission position, and a transmission speed of the to-be-detected pole piece; control the moving mechanism to drive the signal detection component to move in the first direction by a fluctuation distance indicated by the position fluctuation information at the time when the target detection area is driven to the second transmission position.

9. The pole piece defect detection apparatus according to claim 8, wherein The detection control component is specifically configured to: determine a transmission time length according to a distance between the first transmission position and the second transmission position and a transmission speed of the to-be-detected pole piece; determine a time when the target detection area is driven to the second transmission position according to a time when the target detection area is driven to the first transmission position and the transmission time length.

10. The pole piece defect detection apparatus according to any one of claims 1-9, wherein, The detection control component is further configured to: send a defect detection result to a production control component, wherein the defect detection result is used to instruct the production control component to determine whether the pole piece transmission mechanism needs to be stopped based on the defect detection result.

11. The pole piece defect detection apparatus according to any one of claims 1-9, wherein, The detection control component is further configured to: send the defect detection result to a marking component, wherein the defect detection result is used to instruct the marking component to determine whether a defect mark needs to be made on the target detection area based on the defect detection result.

12. A pole piece defect detection system, wherein, The pole piece defect detection system comprises a pole piece transmission mechanism, a production control component, and a pole piece defect detection device according to any one of claims 1-11. The pole piece defect detection device is configured to determine a defect detection result of a target detection area of a to-be-detected pole piece and send the defect detection result to the production control component. The production control component is configured to determine whether the pole piece transmission mechanism needs to be stopped based on the defect detection result.

13. The pole piece defect detection system of claim 12, wherein, The pole piece production system further comprises a marking component. The pole piece defect detection device is further configured to send the defect detection result to the marking component. The marking component is configured to make a defect mark on a target detection area of a to-be-detected pole piece according to the defect detection result.

14. A method of detecting defects in an electrode sheet, wherein, The pole piece defect detection method is applied to the pole piece defect detection device according to any one of claims 1-11, and the method comprises: A signal detection component in the pole piece defect detection device generates a detection magnetic field and generates a target detection signal under common excitation of the detection magnetic field and an eddy current magnetic field, wherein the detection magnetic field is used to generate a target eddy current in a target detection area of a to-be-detected pole piece, and the eddy current magnetic field is a magnetic field generated by the target eddy current. The detection control assembly in the pole piece defect detection equipment receives the target detection signal output by the signal detection assembly, and performs defect detection on the target detection area according to the target detection signal.

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