Detection method and detection device for electrode assembly

Abstract

The embodiment of the invention provides an electrode assembly detection method and device, and the method comprises the steps: carrying out the imaging of an electrode assembly through a TDI detector in the moving process of the electrode assembly, so as to generate a target image; and according to the target image, determining wrinkle information of a pole piece of the electrode assembly. According to the detection method and the detection device of the electrode assembly provided by the embodiment of the invention, the detection efficiency of the electrode assembly can be improved.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a detection method and a detection device for an electrode assembly. Background Art

[0002] With the continuous expansion of the new energy market, the demand for batteries has increased rapidly, and the performance and service life of batteries have become the focus of attention of all parties. A series of defects may occur in battery production. Among them, the defect of the electrode sheet wrinkles of the electrode assembly causes certain hidden dangers during the use of the battery, thus affecting the performance and service life of the battery. Therefore, it is necessary to detect the electrode sheet wrinkles of the electrode assembly during the battery production process.

[0003] Rapid detection of electrode sheet wrinkles of an electrode assembly can improve the production efficiency of the electrode assembly and batteries, etc. Therefore, how to quickly detect electrode sheet wrinkles of an electrode assembly is one of the problems that need to be solved urgently. Summary of the invention

[0004] The embodiments of the present application provide a method and a device for detecting an electrode assembly, which can detect the electrode assembly during its movement, thereby improving the detection efficiency of the electrode assembly.

[0005] In a first aspect, a method for detecting an electrode assembly is provided, the method comprising: during the movement of the electrode assembly, imaging the electrode assembly using a TDI detector to generate a target image; and determining wrinkle information of a pole piece of the electrode assembly based on the target image.

[0006] In the embodiment of the present application, a target image can be generated by using a TDI detector during the movement of the electrode assembly, so as to detect the wrinkles of the electrode sheet of the electrode assembly. On the one hand, the electrode assembly does not need to move to a specified position and stop moving before generating a target image, but generates a target image during the movement of the electrode assembly to detect the electrode assembly, which can improve the detection efficiency of the electrode assembly and reduce the detection cost. On the other hand, using a TDI detector for detection can reduce the size of the detection equipment, simplify the structure of the detection equipment, and reduce the cost of the detection equipment.

[0007] In one possible implementation, the electrode assembly is imaged using a TDI detector to generate a target image, including: using the TDI detector to receive rays penetrating the electrode assembly and imaging to generate a target image, wherein a perpendicular line from the focus of the ray to the TDI detector is perpendicular to the winding axis of the electrode assembly.

[0008] In the embodiment of the present application, during the movement of the electrode assembly, by setting the perpendicular line from the focus of the ray to the TDI detector to be perpendicular to the winding axis of the electrode assembly, the TDI detector can be used to generate a target image of the electrode assembly, thereby determining the wrinkle information of the electrode piece of the electrode assembly. On the one hand, the electrode assembly does not need to move to a specified position and stop moving to generate a target image, but instead generates a target image during the movement of the electrode assembly to detect the wrinkle information of the electrode assembly electrode piece, thereby improving the detection efficiency of the wrinkle information of the electrode assembly electrode piece and reducing the detection cost.

[0009] In a possible implementation, the direction of the diameter of the electrode assembly with the smallest radial distance is parallel to a perpendicular line from the focus of the ray to the TDI detector.

[0010] In the embodiment of the present application, by setting the direction of the smallest radial distance of the electrode assembly to be parallel to the perpendicular direction from the focus of the ray to the TDI detector, the size of the electrode assembly penetrated by the ray can be reduced, thereby reducing the energy of the required ray and saving energy. On the other hand, the wrinkle condition on the surface of the electrode assembly with the largest area can be obtained, which facilitates the analysis of wrinkle information and improves the efficiency of detection.

[0011] In one possible implementation, the size of the TDI detector along the first direction is determined based on the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction, wherein the first direction is perpendicular to the moving direction of the electrode assembly and perpendicular to a perpendicular line from the focus of the ray to the TDI detector.

[0012] In an embodiment of the present application, the size of the TDI detector along the first direction can be determined based on the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction. Then, during the movement of the electrode assembly, the target image of the area to be measured of the electrode assembly can be obtained to improve the detection efficiency and accuracy of the electrode piece of the electrode assembly.

[0013] In a possible implementation, the size L of the TDI detector along the first direction is: L≥b*F, F≥X / a, wherein b is the size to be measured of the electrode assembly along the first direction, F is the magnification of the target image, X is the pixel size of the TDI detector along the first direction, and a is the resolution of the target image along the first direction.

[0014] In an embodiment of the present application, the magnification of the target image can be accurately determined based on the ratio between the pixel size of the TDI detector along the first direction and the resolution of the target image along the first direction. Thus, the size of the TDI detector along the first direction can be accurately determined based on the ratio between the measured size of the electrode assembly along the first direction and the magnification of the target image. Furthermore, during the movement of the electrode assembly, the target image of the measured area of ​​the electrode assembly can be obtained to improve the detection efficiency and accuracy of the electrode piece of the electrode assembly.

[0015] In a possible implementation, a dimension of the TDI detector along the first direction is greater than or equal to 240 mm.

[0016] In an embodiment of the present application, by setting the size of the TDI detector along the first direction to be greater than or equal to 240 mm, the wrinkle information of the electrode piece of the entire electrode assembly can be detected through at most two imaging and two detections, or at most two sets of TDI detectors, thereby improving the detection efficiency.

[0017] In a possible implementation, a dimension of the TDI detector along the first direction is greater than or equal to 480 mm.

[0018] In the embodiment of the present application, the size of the TDI detector along the first direction is set to be greater than or equal to 480 mm, which is basically compatible with the detection of electrode wrinkles of electrode assemblies of all existing sizes.

[0019] In addition, when the size of the TDI detector along the first direction is greater than or equal to 480 mm, the TDI detector can perform one imaging to obtain a target image of the entire electrode assembly, thereby detecting the wrinkle condition of the pole piece of the entire electrode assembly, thereby improving the detection efficiency.

[0020] In a possible implementation, the distance from the center of the electrode assembly to the surface of the TDI detector is the larger of the first target value and the second target value, the first target value is the difference between N times the FOD and the FOD, the second target value is the sum of the size of the electrode assembly along the second direction and the safety margin, the second direction is the direction of the perpendicular line from the focus of the ray to the TDI detector, wherein N is the magnification of the target image, FOD=0.5*c / tan(0.5*α), c is the measured size of the electrode assembly along the third direction, α is the maximum beam angle corresponding to the ray along the third direction, and the third direction is perpendicular to the moving direction of the electrode assembly and perpendicular to the perpendicular line from the focus of the ray to the TDI detector.

[0021] In an embodiment of the present application, by selecting the larger of the first target value and the second target value as the distance between the center of the electrode assembly and the surface of the TDI detector, both the measured dimension of the electrode assembly along the third direction within the imaging range and the design limit requirements of the mechanical structure are taken into consideration, thereby achieving accurate detection of the electrode plate wrinkles of the electrode assembly.

[0022] In a possible implementation, the second target value is greater than or equal to 25 mm.

[0023] In the embodiment of the present application, by setting the second target value to be greater than or equal to 25 mm, the design limit requirements of the mechanical structure are taken into consideration, thereby reducing the possibility of collisions between components during the inspection of the electrode assembly.

[0024] In a possible implementation, the second target value is greater than or equal to 35 mm.

[0025] In the embodiment of the present application, by setting the second target value to be greater than or equal to 35 mm, the design limit requirements of the mechanical structure are taken into consideration, thereby further reducing the possibility of collisions between components during the inspection of the electrode assembly.

[0026] In a possible implementation, the number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 150.

[0027] In the embodiment of the present application, a target image of the electrode assembly can be generated by using a TDI detector with a level greater than 150 during the movement of the electrode assembly, so as to detect the electrode assembly. On the one hand, the electrode assembly does not need to move to a specified position and stop moving before generating a target image, but generates a target image during the movement of the electrode assembly to detect the electrode assembly, which can improve the detection efficiency of the electrode assembly and reduce the detection cost.

[0028] In a possible implementation, the number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 500.

[0029] In an embodiment of the present application, by setting a TDI detection level greater than or equal to 500 in the moving direction of the electrode assembly, the moving speed of the electrode assembly in the process of acquiring the target image of the electrode assembly can be further improved, thereby improving the detection efficiency of the electrode plate wrinkles of the electrode assembly and reducing the detection cost.

[0030] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 150 mm / s.

[0031] In an embodiment of the present application, using a TDI detector, a target image of the electrode assembly can be generated when the moving speed of the electrode assembly is greater than or equal to 150 mm / s. The moving speed of the electrode assembly when generating the target image of the electrode assembly can be increased, thereby improving the detection efficiency of the electrode assembly.

[0032] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 170 mm / s, wherein a dimension of the electrode assembly along a fourth direction is less than or equal to 50 mm, and the fourth direction is parallel to a perpendicular direction from the focus of the ray to the TDI detector.

[0033] In an embodiment of the present application, for an electrode assembly having a dimension along the fourth direction less than or equal to 50 mm, its moving speed can be set to be greater than or equal to 170 mm / s, thereby increasing the moving speed of the electrode assembly while generating a clear target image of the electrode assembly, thereby improving both the detection accuracy and the detection efficiency of the electrode assembly.

[0034] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 350 mm / s, wherein a dimension of the electrode assembly along the fourth direction is less than or equal to 25 mm.

[0035] In an embodiment of the present application, for an electrode assembly having a dimension along the fourth direction less than or equal to 25 mm, its moving speed can be set to be greater than or equal to 350 mm / s, thereby increasing the moving speed of the electrode assembly while generating a clear target image of the electrode assembly, thereby improving both the detection accuracy and the detection efficiency of the electrode assembly.

[0036] In a possible implementation, the pixel size of the TDI detector along the moving direction ranges from 50 μm to 200 μm.

[0037] Therefore, the pixel size range of the TDI detector along the moving direction of the electrode assembly can be set between 50 μm and 200 μm, which can not only obtain better imaging effects, but also meet the resolution requirements of electrode assembly detection, such as misalignment detection.

[0038] In a possible implementation, the pixel size of the TDI detector along the moving direction ranges from 100 μm to 140 μm.

[0039] In an embodiment of the present application, the pixel size range of the TDI detector along the moving direction of the electrode assembly can be set between 100μm and 140μm, which can not only obtain better imaging effects, but also meet the resolution requirements of electrode assembly detection, such as misalignment detection.

[0040] In a possible implementation, the magnification factor of the target image is greater than or equal to 1.2.

[0041] In an embodiment of the present application, the magnification of the target image can be set to be greater than or equal to 1, 2, which not only takes into account the setting limit requirements of the mechanical mechanism and can realize the detection of the electrode assembly, but also can obtain a clear target image and realize accurate detection of the electrode assembly.

[0042] In a possible implementation manner, the magnification factor of the target image is greater than or equal to 2.

[0043] In an embodiment of the present application, the magnification of the target image can be set to be greater than or equal to 2, which not only takes into account the setting limit requirements of the mechanical mechanism and enables the detection of the electrode assembly, but also can obtain a clear target image and enable accurate detection of the electrode assembly.

[0044] In a second aspect, a detection device for an electrode assembly is provided, comprising: an image generating unit for imaging the electrode assembly using a TDI detector to generate a target image during the movement of the electrode assembly; and a processing unit for determining wrinkle information of the electrode piece of the electrode assembly based on the target image.

[0045] In a possible implementation, the image generation unit is used to: use a TDI detector to receive radiation penetrating the electrode assembly and perform imaging to generate a target image, wherein a perpendicular line from the focus of the radiation to the TDI detector is perpendicular to the winding axis of the electrode assembly.

[0046] In a possible implementation, the direction of the diameter of the electrode assembly with the smallest radial distance is parallel to a perpendicular line from the focus of the ray to the TDI detector.

[0047] In one possible implementation, the size of the TDI detector along the first direction is determined based on the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction, wherein the first direction is perpendicular to the moving direction of the electrode assembly and perpendicular to a perpendicular line from the focus of the ray to the TDI detector.

[0048] In a possible implementation, the size L of the TDI detector along the first direction is: L≥b*F, F≥X / a, wherein b is the size to be measured of the electrode assembly along the first direction, F is the magnification of the target image, X is the pixel size of the TDI detector along the first direction, and a is the resolution of the target image along the first direction.

[0049] In a possible implementation, a dimension of the TDI detector along the first direction is greater than or equal to 240 mm.

[0050] In a possible implementation, a dimension of the TDI detector along the first direction is greater than or equal to 480 mm.

[0051] In a possible implementation, the distance from the center of the electrode assembly to the surface of the TDI detector is the larger of the first target value and the second target value, the first target value is the difference between N times the FOD and the FOD, the second target value is the sum of the size of the electrode assembly along the second direction and the safety margin, the second direction is the direction of the perpendicular line from the focus of the ray to the TDI detector, wherein N is the magnification of the target image, FOD=0.5*c / tan(0.5*α), c is the measured size of the electrode assembly along the third direction, α is the maximum beam angle corresponding to the ray along the third direction, and the third direction is perpendicular to the moving direction of the electrode assembly and perpendicular to the perpendicular line from the focus of the ray to the TDI detector.

[0052] In a possible implementation, the second target value is greater than or equal to 25 mm.

[0053] In a possible implementation, the second target value is greater than or equal to 35 mm.

[0054] In a possible implementation, the number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 150.

[0055] In a possible implementation, the number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 500.

[0056] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 150 mm / s.

[0057] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 170 mm / s, wherein a dimension of the electrode assembly along a fourth direction is less than or equal to 50 mm, and the fourth direction is parallel to a perpendicular direction from the focus of the ray to the TDI detector.

[0058] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 350 mm / s, wherein a dimension of the electrode assembly along the fourth direction is less than or equal to 25 mm.

[0059] In a possible implementation, the pixel size of the TDI detector along the moving direction ranges from 50 μm to 200 μm.

[0060] In a possible implementation, the pixel size of the TDI detector along the moving direction ranges from 100 μm to 140 μm.

[0061] In a possible implementation, the magnification factor of the target image is greater than or equal to 1.2.

[0062] In a possible implementation manner, the magnification factor of the target image is greater than or equal to 2.

[0063] In a third aspect, a detection device for an electrode assembly is provided, the detection device comprising a memory and a processor, the memory being used to store instructions, the processor being used to read the instructions and execute the method described in the first aspect or any one of the first aspects according to the instructions.

[0064] In a fourth aspect, a radiation detection device is provided, comprising a radiation source and the device as described in the second aspect or any one of the second aspects.

[0065] In a fifth aspect, a chip is provided, comprising: a processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes the method described in the first aspect or any one of the first aspects.

[0066] In a sixth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store a computer program. When the computer program is executed by a computer, the computer implements the method described in the first aspect or any one of the first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is an architectural diagram of a detection system for an electrode assembly applicable to an embodiment of the present application.

[0068] Figure 2 It is a flow chart of the detection method of the electrode assembly provided in the embodiment of the present application.

[0069] Figure 3 It is a schematic diagram of the structure of the electrode assembly provided in an embodiment of the present application.

[0070] Figure 4 It is a schematic diagram of the imaging principle of the TDI detector provided in the embodiment of the present application.

[0071] Figure 5 It is a schematic diagram of a target image provided in an embodiment of the present application.

[0072] Figure 6 It is a flow chart of the detection method of the electrode assembly provided in the embodiment of the present application.

[0073] Figure 7 It is a schematic diagram of the detection angle of the electrode assembly provided in an embodiment of the present application.

[0074] Figure 8 It is a schematic diagram of the electrode assembly provided in an embodiment of the present application placed on a transmission track.

[0075] Fig. 9 Schematic diagram of FOD and FDD provided in an embodiment of the present application.

[0076] Fig.10 It is a schematic block diagram of a detection device for an electrode assembly provided in an embodiment of the present application.

[0077] Fig.11 It is a schematic block diagram of a detection device for an electrode assembly provided in an embodiment of the present application. DETAILED DESCRIPTION

[0078] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0079] In the description of the present application, it should be noted that the terms "inside", "outside", etc. indicating directions or positional relationships are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application. The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present application. In addition, the "vertical" or "parallel" in the embodiments of the present application are not in a strict sense, but within the range of error allowance.

[0080] 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 "multi-layer" is more than two layers, unless otherwise clearly and specifically defined.

[0081] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0082] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0083] With the continuous expansion of the new energy market, the demand for batteries has increased rapidly, and the performance and service life of batteries have become the focus of attention of all parties. A series of defects may occur in battery production. Among them, the defect of the electrode sheet wrinkles of the electrode assembly causes certain hidden dangers during the use of the battery, thus affecting the performance and service life of the battery. Therefore, it is necessary to detect the electrode sheet wrinkles of the electrode assembly during the battery production process.

[0084] Rapid detection of electrode sheet wrinkles of an electrode assembly can improve the production efficiency of the electrode assembly and batteries, etc. Therefore, how to quickly detect electrode sheet wrinkles of an electrode assembly is one of the problems that need to be solved urgently.

[0085] In view of this, an embodiment of the present application provides a detection method and a detection device for an electrode assembly, the detection method comprising: during the movement of the electrode assembly, imaging the electrode assembly using a time delay integration (TDI) detector to generate a target image; and determining the wrinkle information of the electrode piece of the electrode assembly based on the target image.

[0086] In the embodiment of the present application, a target image can be generated by using a TDI detector during the movement of the electrode assembly, so as to detect the wrinkles of the electrode sheet of the electrode assembly. On the one hand, the electrode assembly does not need to move to a specified position and stop moving before generating a target image, but generates a target image during the movement of the electrode assembly to detect the electrode assembly, which can improve the detection efficiency of the electrode assembly and reduce the detection cost. On the other hand, using a TDI detector for detection can reduce the size of the detection equipment, simplify the structure of the detection equipment, and reduce the cost of the detection equipment.

[0087] Figure 1 It is an architectural diagram of the detection system of the electrode assembly provided in an embodiment of the present application.

[0088] The detection system of the electrode assembly may include a ray source module 110 , an image acquisition module 120 , an image processing and analysis module 130 , a detection position 140 and a transmission track 150 .

[0089] The ray source module 110 may generate and emit rays at a specific emission angle.

[0090] In some embodiments of the present application, the ray source module 110 can be an X-ray source module, which can generate and emit X-rays at a specific emission angle. When the X-rays penetrate the object 160 to be measured on the detection position 140, such as an electrode assembly, they will be absorbed by the object 160 to be measured and attenuate. Different materials such as density, thickness, and material have different absorption of X-rays.

[0091] Exemplarily, the ray source module 110 may be an integrated X-ray source module with low rework rate, high stability, small size, and convenient operation and installation. The integrated X-ray source module may emit electrons from the cathode, which are accelerated by the electric field between the cathode and the anode, bombard the X-ray source target, and transfer their kinetic energy to the atoms on the target. Among them, about 1% of the energy is converted into X-rays, which are emitted from the X-ray irradiation window, and then penetrate the electrode assembly, and are received by the image acquisition module 120 for imaging.

[0092] The image acquisition module 120 can receive rays of different intensities after penetrating the electrode assembly, and generate an electrical signal proportional to the ray intensity, and present the electrical signal in the form of a grayscale image, thereby obtaining an image that can reflect the structural information of the electrode assembly. Since the rays have different penetrating abilities for objects of different structures and materials, their internal structures can be presented by the image acquisition module 120. In an embodiment of the present application, the image acquisition module 120 can include a TDI detector, and during the movement of the electrode assembly, an image of the electrode assembly can be generated using the TDI detector.

[0093] The image processing and analysis module 130 can process and analyze the image acquired by the image acquisition module 120. In the embodiment of the present application, the image processing and analysis module 130 can detect the electrode assembly based on the image of the electrode assembly.

[0094] The electrode assembly 160 can move along with the transmission track 150. That is, the movement of the transmission track 150 can drive the electrode assembly 160 to move, so that during the movement of the electrode assembly 160, the electrode assembly 160 can be imaged by the image acquisition module 120 to generate an image of the electrode assembly.

[0095] Optionally, the above components are just an example. In actual applications, the above components may be added or deleted according to actual needs. Figure 1 It should not be understood as limiting the embodiments of the present application.

[0096] When testing, the electrode assembly is usually assembled into the housing. That is, the housing and the electrode assembly 160 in the housing can be placed on the transfer track 150, and then during the movement of the electrode assembly 160, the electrode assembly 160 can be moved by using the Figure 1 The inspection system shown inspects the electrode assembly 160 .

[0097] Of course, the electrode assembly 160 that is not in the shell can be placed on the transfer track 150 to inspect the electrode assembly 160 .

[0098] Figure 2 A schematic flow chart of a method for detecting an electrode assembly provided in an embodiment of the present application. Figure 2The detection method shown can be applied to Figure 1 The detection system shown.

[0099] 210 , during the movement of the electrode assembly, the electrode assembly is imaged using a TDI detector to generate a target image.

[0100] In the embodiment of the present application, the electrode assembly 160 may include a laminated electrode assembly or a wound electrode assembly, etc. The wound electrode assembly may include a cylindrical wound electrode assembly, an elliptical cylindrical wound electrode assembly, or a wound electrode assembly similar to an elliptical cylindrical assembly.

[0101] The following is a brief introduction to the structure of the electrode assembly using a wound electrode assembly as an example. Figure 3 As shown in (a), each layer of the electrode assembly includes a diaphragm, an anode electrode sheet, a diaphragm and a cathode electrode sheet from the outside to the inside. Among them, the diaphragm can be used to reduce the short circuit problem between the anode electrode sheet and the cathode electrode sheet. The electrode assembly includes multiple layers of anode electrode sheets and multiple layers of cathode electrode sheets. The winding axis of the electrode assembly is as shown in FIG. Figure 3 As shown in (b), the electrode assembly's pole pieces, separators, etc. are wound along a winding axis to form an electrode assembly.

[0102] Figure 4 Schematic diagram of the imaging principle of the TDI detector. Figure 4 As shown, the TDI detector may include multiple line arrays. During the movement of the tested object, each line array of the TDI detector may image the corresponding position of the tested object, and then integrate the imaging data to obtain a complete image of the tested object in its moving direction. During the movement of the tested object, the tested object is detected and exposed multiple times, which can increase the effective structural information of the tested object. In the embodiment of the present application, the tested object may be an electrode assembly.

[0103] In the embodiment of the present application, the target image may be an image of a part or the whole area of ​​the electrode assembly, and the part of the electrode assembly included in the target image may be determined according to the detection requirements. For example, the target image may be an image of the whole area of ​​the electrode assembly, such as Figure 5 shown.

[0104] 220, determining wrinkle information of the electrode piece of the electrode assembly according to the target image.

[0105] Since the number of electrode sheet layers in the electrode assembly's wrinkled and unwrinkled areas is different, that is, the density of the material in the wrinkled and unwrinkled areas is different, the grayscale, color, etc. of the wrinkled and unwrinkled areas in the target image are different. Therefore, whether the electrode assembly's electrode sheet has wrinkles and the location of the wrinkles are determined based on the grayscale, color, etc. of the target image. Figure 5 It can be seen that the darker areas in the target image are where wrinkles exist on the electrode sheets of the electrode assembly, and the lighter areas are where wrinkles do not exist on the electrode sheets of the electrode assembly.

[0106] In the embodiment of the present application, a target image can be generated by using a TDI detector during the movement of the electrode assembly, so as to detect the electrode assembly. On the one hand, the electrode assembly does not need to move to a specified position and stop moving before generating a target image, but generates a target image during the movement of the electrode assembly to detect the electrode assembly, which can improve the detection efficiency of the electrode assembly and reduce the detection cost. On the other hand, using a TDI detector for detection can reduce the size of the detection equipment, simplify the structure of the detection equipment, and reduce the cost of the detection equipment.

[0107] Figure 6 It is a flow chart of the detection method of the electrode assembly provided in the embodiment of the present application.

[0108] 610. During the movement of the electrode assembly, a TDI detector is used to receive radiation penetrating the electrode assembly and perform imaging to generate a target image.

[0109] The perpendicular line from the focus of the ray to the TDI detector is perpendicular to the winding axis of the electrode assembly.

[0110] Figure 7 The figure shows a schematic diagram of a perpendicular line from the focus of the ray to the TDI detector being perpendicular to the winding axis of the electrode assembly. Figure 7 After the electrode assembly shown is rotated clockwise or counterclockwise by a certain angle, the perpendicular line from the focus of the ray to the TDI detector is still perpendicular to the winding axis of the electrode assembly.

[0111] 620, determining wrinkle information of the electrode piece of the electrode assembly according to the target image.

[0112] In the embodiment of the present application, during the movement of the electrode assembly, by setting the perpendicular line from the focus of the ray to the TDI detector to be perpendicular to the winding axis of the electrode assembly, the TDI detector can be used to generate a target image of the electrode assembly, thereby determining the wrinkle information of the electrode piece of the electrode assembly. On the one hand, the electrode assembly does not need to move to a specified position and stop moving to generate a target image, but instead generates a target image during the movement of the electrode assembly to detect the wrinkle information of the electrode assembly electrode piece, thereby improving the detection efficiency of the wrinkle information of the electrode assembly electrode piece and reducing the detection cost.

[0113] In some embodiments of the present application, the direction of the diameter of the electrode assembly with the smallest radial distance is parallel to the perpendicular line from the focus of the ray to the TDI detector.

[0114] The radial distance of the electrode assembly can be the distance between the winding axis of the electrode assembly and the pole piece of a certain layer. For example, the radial distance of the electrode assembly is the distance between the winding axis of the electrode assembly and the pole piece of the outermost layer of the electrode assembly. For another example, the radial distance of the electrode assembly can be the distance between the winding axis of the electrode assembly and the pole piece of the innermost layer of the electrode assembly. The direction where the diameter of the electrode assembly has the smallest radial distance is Figure 7 In the vertical direction shown, the direction of the diameter of the electrode assembly with the smallest radial distance may be parallel to the perpendicular direction from the focus of the ray to the TDI detector.

[0115] In one embodiment of the present application, the electrode assembly can be arranged along Figure 7 Optionally, the electrode assembly may also move in a direction perpendicular to Figure 7 Move in the direction of the paper.

[0116] In the embodiment of the present application, by setting the direction of the smallest radial distance of the electrode assembly to be parallel to the perpendicular direction from the focus of the ray to the TDI detector, the size of the electrode assembly penetrated by the ray can be reduced, thereby reducing the energy of the required ray and saving energy. On the other hand, the wrinkle condition on the surface of the electrode assembly with the largest area can be obtained, which facilitates the analysis of wrinkle information and improves the efficiency of detection.

[0117] In some embodiments of the present application, the size of the TDI detector along the first direction is determined based on the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction, wherein the first direction is perpendicular to the moving direction of the electrode assembly and perpendicular to the vertical line from the focus of the ray to the TDI detector.

[0118] That is, the size of the TDI detector along the third direction can be determined by the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction.

[0119] The dimension to be measured of the electrode assembly along the first direction, that is, the dimension of the area to be detected of the electrode assembly along the first direction.

[0120] like Figure 8 As shown, the direction perpendicular to the paper is the vertical direction from the focus of the ray to the TDI detector, and the first direction is perpendicular to the vertical direction and perpendicular to the moving direction of the electrode assembly. Figure 8 In the embodiment, the first direction may refer to the width direction of the transmission track that drives the electrode assembly to move.

[0121] For example, the area of ​​the electrode assembly to be inspected is the entire electrode assembly, and the dimension of the electrode assembly to be measured along the first direction is the dimension of the electrode assembly along the first direction. Figure 8 The lower half area of ​​the electrode assembly shown, the dimension to be measured of the electrode assembly along the first direction is the dimension of the lower half area of ​​the electrode assembly along the first direction.

[0122] In an embodiment of the present application, the size of the TDI detector along the first direction can be determined based on the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction. Then, during the movement of the electrode assembly, the target image of the area to be measured of the electrode assembly can be obtained to improve the detection efficiency and accuracy of the electrode piece of the electrode assembly.

[0123] In some embodiments of the present application, the size L of the TDI detector along the first direction is:

[0124] L ≥ b * F Formula (1)

[0125] F≥X / a Formula (2)

[0126] Wherein, b is the dimension to be measured of the electrode assembly along the first direction, F is the magnification of the target image, X is the pixel size of the TDI detector along the first direction, and a is the resolution of the target image along the first direction.

[0127] Generally speaking, the magnification of an image is the same in its length and width directions, and therefore, the magnification of the target image may not be differentiated.

[0128] In an embodiment of the present application, the magnification of the target image can be accurately determined based on the ratio between the pixel size of the TDI detector along the first direction and the resolution of the target image along the first direction. Thus, the size of the TDI detector along the first direction can be accurately determined based on the ratio between the measured size of the electrode assembly along the first direction and the magnification of the target image. Furthermore, during the movement of the electrode assembly, the target image of the measured area of ​​the electrode assembly can be obtained to improve the detection efficiency and accuracy of the electrode piece of the electrode assembly.

[0129] In some embodiments of the present application, a dimension of the TDI detector along the first direction is greater than or equal to 240 mm.

[0130] When the size of the TDI detector along the first direction is greater than or equal to 240 mm, the electrode assembly generally needs to be tested twice at most, for example, Figure 8 The upper area of ​​the electrode assembly shown is tested once. Figure 8 By inspecting the lower half of the electrode assembly shown once, the wrinkle inspection of the electrode sheet of the entire electrode assembly can be completed.

[0131] Alternatively, two sets of TDI detectors can be provided, one set of TDI detectors for Figure 8 The upper half of the electrode assembly shown is imaged, and a set of TDI detectors are used to image the Figure 8 The lower half of the electrode assembly shown is imaged, so that the upper half and the lower half of the electrode assembly can be imaged simultaneously, thereby improving detection efficiency.

[0132] In an embodiment of the present application, by setting the size of the TDI detector along the first direction to be greater than or equal to 240 mm, the wrinkle information of the electrode piece of the entire electrode assembly can be detected through at most two imaging and two detections, or at most two sets of TDI detectors, thereby improving the detection efficiency.

[0133] In some embodiments of the present application, a dimension of the TDI detector along the first direction is greater than or equal to 480 mm.

[0134] At present, the size of the electrode assembly along the first direction is generally within 400 mm, and the size of the TDI detector along the first direction is set to be greater than or equal to 480 mm, which is basically compatible with the detection of electrode wrinkles of electrode assemblies of all existing sizes.

[0135] In addition, when the size of the TDI detector along the first direction is greater than or equal to 480 mm, the TDI detector can perform one imaging to obtain a target image of the entire electrode assembly, thereby detecting the wrinkle condition of the pole piece of the entire electrode assembly, thereby improving the detection efficiency.

[0136] In some embodiments of the present application, the radiation source that emits radiation includes an integrated X-ray source.

[0137] The integrated X-ray source has a low rework rate, high stability, small size, and is easy to operate and install. The integrated X-ray source can emit electrons from the cathode, which are accelerated by the electric field between the cathode and the anode and bombard the X-ray source target, transferring their kinetic energy to the atoms on the target. Among them, about 1% of the energy is converted into X-rays, which are emitted from the X-ray irradiation window, then penetrate the electrode assembly, and are received by the TDI detector for imaging.

[0138] In an embodiment of the present application, by utilizing an integrated X-ray source with a low rework rate, high stability, small size, and easy operation and installation to emit X-rays, the stability and efficiency of the detection of the electrode assembly can be improved, and the space of the detection equipment can be reasonably utilized.

[0139] Optionally, the radiation source emitting radiation may include a gamma ray source.

[0140] The distance between the center of the electrode assembly and the surface of the TDI detector is the larger of the first target value and the second target value, the first target value is the difference between N times the FOD and the FOD, the second target value is the sum of the size of the electrode assembly along the second direction and the safety margin, the second direction is the direction of the perpendicular line from the focus of the ray to the TDI detector, wherein N is the magnification of the target image, FOD=0.5*c / tan(0.5*α), c is the measured size of the electrode assembly along the third direction, α is the maximum beam angle corresponding to the ray along the third direction, and the third direction is perpendicular to the moving direction of the electrode assembly and perpendicular to the perpendicular line from the focus of the ray to the TDI detector.

[0141] Wherein, FOD refers to the distance between the focus of the ray and the center of the electrode assembly along the second direction, and FDD refers to the distance between the focus of the ray and the TDI detector along the second direction, such as Fig. 9 shown.

[0142] The maximum beam angle α corresponding to the ray along the third direction, and the third direction Fig. 9 When setting the size of FOD, it is necessary to consider that the size covered by the maximum beam angle of the ray along the third direction is greater than or equal to the size to be measured of the electrode assembly.

[0143] In the embodiments of the present application, Fig. 9 The third direction in Figure 8 The first direction in is the same direction.

[0144] Since FDD=N*FOD, the distance from the center of the electrode assembly to the TDI detector can be N*FOD-FOD. In this way, the dimension to be measured of the electrode assembly along the third direction can be within the imaging range.

[0145] On the other hand, the distance setting from the center of the electrode assembly to the TDI detector also needs to consider the electrode assembly and the safety distance, that is, the design limit of the mechanical structure needs to be considered. For example, the second target value can be understood as the design limit, which can be equal to the sum of the size of the electrode assembly along the second direction and a certain safety margin.

[0146] Therefore, when setting the distance between the center of the electrode assembly and the surface of the TDI detector, it is necessary to comprehensively consider the above two factors, so that the measured dimension of the electrode assembly along the third direction is within the imaging range, and the design limit requirements of the mechanical structure are met. Therefore, the larger one between the first target value and the second target value can be selected as the distance between the center of the electrode assembly and the surface of the TDI detector.

[0147] In an embodiment of the present application, by selecting the larger of the first target value and the second target value as the distance between the center of the electrode assembly and the surface of the TDI detector, both the measured dimension of the electrode assembly along the third direction within the imaging range and the design limit requirements of the mechanical structure are taken into consideration, thereby achieving accurate detection of the electrode plate wrinkles of the electrode assembly.

[0148] In some embodiments of the present application, the second target value is greater than or equal to 25 mm.

[0149] For example, α=50°, the dimension of the electrode assembly to be measured along the third direction is 400mm, if the ray covers the dimension of the electrode assembly to be measured along the third direction, FOD=0.5*400 / tan25°≈429mm. When the magnification N is assumed to be 1.2 times, FDD=1.2*429≈514mm, then the first target value is 514-429=85mm.

[0150] Assuming that the second target value is 25 mm, the distance from the center of the electrode assembly to the surface of the TDI detector may be set to 85 mm.

[0151] For another example, α=50°, the dimension of the electrode assembly to be measured along the third direction is 100 mm, if the ray covers the dimension of the electrode assembly to be measured along the third direction, FOD=0.5*100 / tan25°≈107 mm. When the magnification N is assumed to be 1.2 times, FDD=1.2*107≈128 mm, then the first target value is 128-107=21 mm.

[0152] Assuming that the second target value is 25 mm, the distance between the center of the electrode assembly and the surface of the TDI detector may be set to 25 mm.

[0153] In the embodiment of the present application, by setting the second target value to be greater than or equal to 25 mm, the design limit requirements of the mechanical structure are taken into consideration, thereby reducing the possibility of collisions between components during the inspection of the electrode assembly.

[0154] In some embodiments of the present application, the second target value is greater than or equal to 35 mm.

[0155] In the embodiment of the present application, by setting the second target value to be greater than or equal to 35 mm, the design limit requirements of the mechanical structure are taken into consideration, thereby further reducing the possibility of collisions between components during the inspection of the electrode assembly.

[0156] In some embodiments of the present application, the number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 150.

[0157] Along the moving direction of the electrode assembly, the total integration time of the TDI detector = the integration time of each level of the TDI detector * the number of levels of the TDI detector. To generate a target image of a certain electrode assembly, in order to clearly distinguish the areas where wrinkles are generated and the areas where wrinkles are not generated on the electrode sheet of the electrode assembly, the TDI detector needs to reach a certain level of total integration time. For the same electrode assembly, the total integration time required for its target image to clearly distinguish the areas where wrinkles are generated and the areas where wrinkles are not generated on the electrode sheet of the electrode assembly can be determined through testing.

[0158] Under the condition that the total integration time is satisfied, the higher the number of TDI detectors, the shorter the integration time of each level of the TDI detector. The integration time of one level of the TDI detector = the size of one level of the TDI detector in the moving direction of the electrode assembly / the moving speed of the electrode assembly. Therefore, for the same electrode assembly, the higher the number of TDI detectors, the faster the moving speed of the electrode assembly can be, so that the target image of the electrode assembly can be obtained when the moving speed of the electrode assembly is fast.

[0159] In the direction of movement of the electrode assembly, the dimensions of one stage of the TDI detector may be as follows: Figure 4 The size of a line array shown is Figure 4 The dimension of the short side of one line array is shown.

[0160] It should be understood that the frame rate of the TDI detector is generally known, and the maximum integration time of the first stage of the TDI detector does not exceed 1 / the frame rate of the TDI detector.

[0161] In the embodiment of the present application, a target image of the electrode assembly can be generated by using a TDI detector with a level greater than 150 during the movement of the electrode assembly, so as to detect the electrode assembly. On the one hand, the electrode assembly does not need to move to a specified position and stop moving before generating a target image, but generates a target image during the movement of the electrode assembly to detect the electrode assembly, which can improve the detection efficiency of the electrode assembly and reduce the detection cost.

[0162] In some embodiments of the present application, the number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 500.

[0163] Along the moving direction of the electrode assembly, the greater the level of TDI, the faster the moving speed of the electrode assembly can be.

[0164] Therefore, by setting a TDI detection level greater than or equal to 500 in the moving direction of the electrode assembly, the moving speed of the electrode assembly in the process of acquiring the target image of the electrode assembly can be further improved, thereby improving the detection efficiency of the electrode plate wrinkles of the electrode assembly and reducing the detection cost.

[0165] In some embodiments of the present application, the moving speed of the electrode assembly is greater than or equal to 150 mm / s.

[0166] By using the TDI detector, a target image of the electrode assembly can be acquired when the moving speed of the electrode assembly is greater than or equal to 150 mm / s.

[0167] In some embodiments, the number of levels of the TDI detector may be set to be greater than 150 levels, so that a target image of the electrode assembly may be generated when the moving speed of the electrode assembly is greater than or equal to 150 mm / s.

[0168] In an embodiment of the present application, using a TDI detector, a target image of the electrode assembly can be generated when the moving speed of the electrode assembly is greater than or equal to 150 mm / s. The moving speed of the electrode assembly when generating the target image of the electrode assembly can be increased, thereby improving the detection efficiency of the electrode assembly.

[0169] In some embodiments of the present application, the movement speed of the electrode assembly is greater than or equal to 170 mm / s, wherein the dimension of the electrode assembly along the fourth direction is less than or equal to 50 mm, and the fourth direction is parallel to the perpendicular direction from the focus of the ray to the TDI detector.

[0170] Among them, the direction of the perpendicular line from the focus of the ray to the TDI detector is as follows: Figure 7 shown.

[0171] The size of the electrode assembly along the fourth direction is an important factor affecting the total integration time of the TDI detector. For an electrode assembly with a slightly larger size along the fourth direction, its moving speed can be controlled to be relatively slow, so as to meet the total integration time of the TDI detector and obtain a target image that can clearly distinguish the electrode plate wrinkles of the electrode assembly.

[0172] In an embodiment of the present application, for an electrode assembly having a dimension along the fourth direction less than or equal to 50 mm, its moving speed can be set to be greater than or equal to 170 mm / s, thereby increasing the moving speed of the electrode assembly while generating a clear target image of the electrode assembly, thereby improving both the detection accuracy and the detection efficiency of the electrode assembly.

[0173] In some embodiments of the present application, the moving speed of the electrode assembly is greater than or equal to 350 mm / s, wherein the dimension of the electrode assembly along the fourth direction is less than or equal to 25 mm.

[0174] Generally speaking, the smaller the size of the electrode assembly along the second direction is, the shorter the total integration time required is. When the number of levels of the TDI detector is constant, the smaller the size of the electrode assembly along the second direction is, the faster the moving speed is.

[0175] Therefore, for an electrode assembly having a dimension along the fourth direction less than or equal to 25 mm, the moving speed can be greater than or equal to 350 mm, thereby meeting the total integration time requirement of the electrode assembly to obtain a target image that can clearly distinguish the electrode plate wrinkles of the electrode assembly.

[0176] In an embodiment of the present application, for an electrode assembly having a dimension along the fourth direction less than or equal to 25 mm, its moving speed can be set to be greater than or equal to 350 mm / s, thereby increasing the moving speed of the electrode assembly while generating a clear target image of the electrode assembly, thereby improving both the detection accuracy and the detection efficiency of the electrode assembly.

[0177] In some embodiments of the present application, the pixel size of the TDI detector along the moving direction ranges from 50 μm to 200 μm.

[0178] The pixel size of the TDI detector along the moving direction of the electrode assembly is Figure 5 The size of a linear array of the TDI detector shown along the direction of movement of the electrode assembly, i.e., Figure 5 The dimensions of the short side of one linear array are shown.

[0179] Generally speaking, when the pixel movement size of the TDI detector along the moving direction of the electrode assembly is relatively small, the radiation amount received by the TDI detector will also be relatively small, affecting the imaging effect. When the pixel movement size of the TDI detector along the moving direction of the electrode assembly is relatively large, the target image generated by the TDI detector cannot meet the resolution requirements of the electrode assembly test, such as the misalignment test.

[0180] Therefore, the pixel size range of the TDI detector along the moving direction of the electrode assembly can be set between 50 μm and 200 μm, which can not only obtain better imaging effects, but also meet the resolution requirements of electrode assembly detection, such as misalignment detection.

[0181] In some embodiments of the present application, the pixel size of the TDI detector along the moving direction ranges from 100 μm to 140 μm.

[0182] In an embodiment of the present application, the pixel size range of the TDI detector along the moving direction of the electrode assembly can be set between 100μm and 140μm, which can not only obtain better imaging effects, but also meet the resolution requirements of electrode assembly detection, such as misalignment detection.

[0183] In some embodiments of the present application, the magnification of the target image is greater than or equal to 1.2.

[0184] Generally speaking, the wrinkle test of the electrode assembly is a relatively large area test. In this case, the resolution of the target image is ≤170μm, and the magnification factor = the pixel size of the TDI detector along the moving direction of the electrode assembly / resolution. When the pixel size is 200μm, a magnification factor of about 1.2 is required. When the pixel size is 50μm, no magnification (magnification factor of 1) is required to meet the resolution requirement.

[0185] On the other hand, the magnification factor also needs to take into account the degree of machining of the detection equipment, that is, the distance between the center of the electrode assembly and the TDI detector.

[0186] Taking the above into consideration, the magnification of the target image can be set to be greater than or equal to 1,2, which not only takes into account the setting limit requirements of the mechanical mechanism and can realize the detection of the electrode assembly, but also can obtain a clear target image and realize the accurate detection of the electrode assembly.

[0187] In some embodiments of the present application, the magnification factor of the target image is greater than or equal to 2.

[0188] The magnification of the target image can be set to be greater than or equal to 2, which not only takes into account the setting limit requirements of the mechanical mechanism and can realize the detection of the electrode assembly, but also can obtain a clear target image and realize accurate detection of the electrode assembly.

[0189] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0190] The above describes in detail the detection method of the electrode assembly of the embodiment of the present application. Fig.10 and Fig.11 The detection device of the electrode assembly of the embodiment of the present application is described in detail, and the technical features described in the method embodiment are applicable to the following device embodiments.

[0191] Fig.10 FIG. 3 is a schematic block diagram of a detection device 3000 for an electrode assembly according to an embodiment of the present application. Fig.10 As shown, the detection device includes some or all of the following contents.

[0192] The detection device 3000 includes an image generating unit 3100 and a processing unit 3200 .

[0193] The image generation unit 3100 is used to image the electrode assembly using a TDI detector to generate a target image during the movement of the electrode assembly; the processing unit 3200 is used to determine the wrinkle information of the electrode piece of the electrode assembly based on the target image.

[0194] In a possible implementation, the image generation unit 3100 is used to: use a TDI detector to receive rays penetrating the electrode assembly and perform imaging to generate a target image, wherein a perpendicular line from the focus of the ray to the TDI detector is perpendicular to the winding axis of the electrode assembly.

[0195] In a possible implementation, the direction of the diameter of the electrode assembly with the smallest radial distance is parallel to a perpendicular line from the focus of the ray to the TDI detector.

[0196] In one possible implementation, the size of the TDI detector along the first direction is determined based on the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction, wherein the first direction is perpendicular to the moving direction of the electrode assembly and perpendicular to a perpendicular line from the focus of the ray to the TDI detector.

[0197] In a possible implementation, the size L of the TDI detector along the first direction is: L≥b*F, F≥X / a, wherein b is the size to be measured of the electrode assembly along the first direction, F is the magnification of the target image, X is the pixel size of the TDI detector along the first direction, and a is the resolution of the target image along the first direction.

[0198] In a possible implementation, a dimension of the TDI detector along the first direction is greater than or equal to 240 mm.

[0199] In a possible implementation, a dimension of the TDI detector along the first direction is greater than or equal to 480 mm.

[0200] In a possible implementation, the distance from the center of the electrode assembly to the surface of the TDI detector is the larger of the first target value and the second target value, the first target value is the difference between N times the FOD and the FOD, the second target value is the sum of the size of the electrode assembly along the second direction and the safety margin, the second direction is the direction of the perpendicular line from the focus of the ray to the TDI detector, wherein N is the magnification of the target image, FOD=0.5*c / tan(0.5*α), c is the measured size of the electrode assembly along the third direction, α is the maximum beam angle corresponding to the ray along the third direction, and the third direction is perpendicular to the moving direction of the electrode assembly and perpendicular to the perpendicular line from the focus of the ray to the TDI detector.

[0201] In a possible implementation, the second target value is greater than or equal to 25 mm.

[0202] In a possible implementation, the second target value is greater than or equal to 35 mm.

[0203] In a possible implementation, the number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 150.

[0204] In a possible implementation, the number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 500.

[0205] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 150 mm / s.

[0206] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 170 mm / s, wherein a dimension of the electrode assembly along a fourth direction is less than or equal to 50 mm, and the fourth direction is parallel to a perpendicular direction from the focus of the ray to the TDI detector.

[0207] In a possible implementation, the moving speed of the electrode assembly is greater than or equal to 350 mm / s, wherein a dimension of the electrode assembly along the fourth direction is less than or equal to 25 mm.

[0208] In a possible implementation, the pixel size of the TDI detector along the moving direction ranges from 50 μm to 200 μm.

[0209] In a possible implementation, the pixel size of the TDI detector along the moving direction ranges from 100 μm to 140 μm.

[0210] In a possible implementation, the magnification factor of the target image is greater than or equal to 1.2.

[0211] In a possible implementation manner, the magnification factor of the target image is greater than or equal to 2.

[0212] It should be understood that the above and other operations and / or functions of each module in the detection device 3000 are for realizing the corresponding processes in the above-mentioned electrode assembly detection method, and for the sake of brevity, they are not repeated here.

[0213] Fig.11 FIG. 4 is a schematic block diagram of a detection device 4000 for an electrode assembly according to an embodiment of the present application. Fig.11 As shown, the detection device 4000 includes a processor 4100 and a memory 4200, wherein the memory 4200 is used to store instructions, and the processor 4100 is used to read the instructions and execute the methods of the various embodiments of the present application based on the instructions.

[0214] The memory 4200 may be a separate device independent of the processor 4100 , or may be integrated into the processor 4100 .

[0215] Alternatively, if Fig.11 As shown, the detection device 4000 may further include a transceiver 4300, and the processor 4100 may control the transceiver 4300 to communicate with other devices. Specifically, information or data may be sent to other devices, or information or data sent by other devices may be received.

[0216] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor can be combined to perform. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0217] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0218] The embodiment of the present application also provides a ray detection device, which includes a ray source and a detection device of the electrode assembly provided in the embodiment of the present application.

[0219] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0220] Optionally, the computer-readable storage medium can be applied to the detection device of the electrode assembly in the embodiment of the present application, and when the computer program is run on the computer, it enables the computer to execute the corresponding processes implemented by the control device in the various methods of the embodiment of the present application. For the sake of brevity, they will not be repeated here.

[0221] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0222] Optionally, the computer program product can be applied to the detection device of the electrode assembly in the embodiments of the present application, and when the computer program instructions are run on a computer, the computer executes the corresponding processes implemented by the detection device of the electrode assembly in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0223] The embodiment of the present application also provides a computer program.

[0224] Optionally, the computer program can be applied to the detection device of the electrode assembly in the embodiments of the present application. When the computer program is run on a computer, the computer executes the corresponding processes implemented by the detection device of the electrode assembly in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0225] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0226] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0227] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0228] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0229] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0230] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0231] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for detecting an electrode assembly, characterized in that: include: During the movement of the electrode assembly, imaging the electrode assembly using a TDI detector to generate a target image; According to the target image, wrinkle information of the electrode sheet of the electrode assembly is determined.

2. The detection method according to claim 1, characterized in that: The method of imaging the electrode assembly using a TDI detector to generate a target image includes: The TDI detector is used to receive the radiation penetrating the electrode assembly and perform imaging to generate a target image, wherein a perpendicular line from the focus of the radiation to the TDI detector is perpendicular to the winding axis of the electrode assembly.

3. The detection method according to claim 2, characterized in that: The direction of the diameter of the electrode assembly with the smallest radial distance is parallel to the perpendicular line from the focus of the ray to the TDI detector.

4. The detection method according to any one of claims 1 to 3, characterized in that: The size of the TDI detector along the first direction is determined based on the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction, wherein the first direction is perpendicular to the moving direction of the electrode assembly and perpendicular to a perpendicular line from the focus of the ray to the TDI detector.

5. The detection method according to claim 4, characterized in that: The size L of the TDI detector along the first direction is: L≥b*F, F ≥ X / a, Wherein, b is the dimension to be measured of the electrode assembly along the first direction, F is the magnification of the target image, X is the pixel size of the TDI detector along the first direction, and a is the resolution of the target image along the first direction.

6. The detection method according to claim 4 or 5, characterized in that: The dimension of the TDI detector along the first direction is greater than or equal to 240 mm.

7. The detection method according to any one of claims 4 to 6, characterized in that: The dimension of the TDI detector along the first direction is greater than or equal to 480 mm.

8. The detection method according to any one of claims 1 to 7, characterized in that: The distance from the center of the electrode assembly to the surface of the TDI detector is the larger of the first target value and the second target value, the first target value is the difference between N times the FOD and the FOD, the second target value is the sum of the size of the electrode assembly along the second direction and the safety margin, the second direction is the direction of the perpendicular line from the focus of the ray to the TDI detector, wherein N is the magnification of the target image, FOD=0.5*c / tan(0.5*α), c is the measured size of the electrode assembly along the third direction, α is the maximum beam angle corresponding to the ray along the third direction, and the third direction is perpendicular to the moving direction of the electrode assembly and perpendicular to the perpendicular line from the focus of the ray to the TDI detector.

9. The detection method according to claim 8, characterized in that: The second target value is greater than or equal to 25 mm.

10. The detection method according to claim 8 or 9, characterized in that: The second target value is greater than or equal to 35 mm.

11. The detection method according to any one of claims 1 to 10, characterized in that: The number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 150.

12. The detection method according to any one of claims 1 to 11, characterized in that: The number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 500.

13. The detection method according to any one of claims 1 to 12, characterized in that: The moving speed of the electrode assembly is greater than or equal to 150 mm / s.

14. The detection method according to any one of claims 1 to 13, characterized in that: The moving speed of the electrode assembly is greater than or equal to 170 mm / s, wherein a dimension of the electrode assembly along a fourth direction is less than or equal to 50 mm, and the fourth direction is parallel to a perpendicular direction from the focus of the ray to the TDI detector.

15. The detection method according to claim 14, characterized in that: The moving speed of the electrode assembly is greater than or equal to 350 mm / s, wherein the dimension of the electrode assembly along the fourth direction is less than or equal to 25 mm.

16. The detection method according to any one of claims 1 to 15, characterized in that: The pixel size of the TDI detector along the moving direction ranges from 50 μm to 200 μm.

17. The detection method according to any one of claims 1 to 16, characterized in that: The pixel size of the TDI detector along the moving direction ranges from 100 μm to 140 μm.

18. The detection method according to any one of claims 1 to 17, characterized in that: The magnification of the target image is greater than or equal to 1.

2.

19. The detection method according to any one of claims 1 to 18, characterized in that: The square magnification of the target image is greater than or equal to 2.

20. A detection device for an electrode assembly, characterized in that: include: An image generating unit, used for imaging the electrode assembly using a TDI detector to generate a target image during the movement of the electrode assembly; A processing unit is used to determine the wrinkle information of the electrode piece of the electrode assembly according to the target image.

21. The detection device according to claim 20, characterized in that: The image generating unit is used for: The TDI detector is used to receive the radiation penetrating the electrode assembly and perform imaging to generate a target image, wherein a perpendicular line from the focus of the radiation to the TDI detector is perpendicular to the winding axis of the electrode assembly.

22. The detection device according to claim 21, characterized in that: The direction of the diameter of the electrode assembly with the smallest radial distance is parallel to the perpendicular line from the focus of the ray to the TDI detector.

23. The detection device according to any one of claims 20 to 22, characterized in that: The size of the TDI detector along the first direction is determined based on the pixel size of the TDI detector along the first direction, the size to be measured of the electrode assembly along the first direction, and the resolution of the target image along the first direction, wherein the first direction is perpendicular to the moving direction of the electrode assembly and perpendicular to a perpendicular line from the focus of the ray to the TDI detector.

24. The detection device according to claim 23, characterized in that: The size L of the TDI detector along the first direction is: L≥b*F, F ≥ X / a, Wherein, b is the dimension to be measured of the electrode assembly along the first direction, F is the magnification of the target image, X is the pixel size of the TDI detector along the first direction, and a is the resolution of the target image along the first direction.

25. The detection device according to claim 23 or 24, characterized in that: The dimension of the TDI detector along the first direction is greater than or equal to 240 mm.

26. The detection device according to any one of claims 23 to 25, characterized in that: The dimension of the TDI detector along the first direction is greater than or equal to 480 mm.

27. The detection device according to any one of claims 20 to 26, characterized in that: The distance from the center of the electrode assembly to the surface of the TDI detector is the larger of the first target value and the second target value, the first target value is the difference between N times the FOD and the FOD, the second target value is the sum of the size of the electrode assembly along the second direction and the safety margin, the second direction is the direction of the perpendicular line from the focus of the ray to the TDI detector, wherein N is the magnification of the target image, FOD=0.5*c / tan(0.5*α), c is the measured size of the electrode assembly along the third direction, α is the maximum beam angle corresponding to the ray along the third direction, and the third direction is perpendicular to the moving direction of the electrode assembly and perpendicular to the perpendicular line from the focus of the ray to the TDI detector.

28. The detection device according to claim 27, characterized in that: The second target value is greater than or equal to 25 mm.

29. The detection device according to claim 27 or 28, characterized in that: The second target value is greater than or equal to 35 mm.

30. The detection device according to any one of claims 20 to 29, characterized in that: The number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 150.

31. The detection device according to any one of claims 20 to 30, characterized in that: The number of levels of the TDI detector along the moving direction of the electrode assembly is greater than 500.

32. The detection device according to any one of claims 20 to 31, characterized in that The moving speed of the electrode assembly is greater than or equal to 150 mm / s.

33. The detection device according to any one of claims 20 to 32, characterized in that: The moving speed of the electrode assembly is greater than or equal to 170 mm / s, wherein a dimension of the electrode assembly along a fourth direction is less than or equal to 50 mm, and the fourth direction is parallel to a perpendicular direction from the focus of the ray to the TDI detector.

34. The detection device according to claim 33, characterized in that: The moving speed of the electrode assembly is greater than or equal to 350 mm / s, wherein the dimension of the electrode assembly along the fourth direction is less than or equal to 25 mm.

35. The detection device according to any one of claims 20 to 34, characterized in that The pixel size of the TDI detector along the moving direction ranges from 50 μm to 200 μm.

36. The detection device according to any one of claims 20 to 35, characterized in that The pixel size of the TDI detector along the moving direction ranges from 100 μm to 140 μm.

37. The detection device according to any one of claims 20 to 36, characterized in that The magnification of the target image is greater than or equal to 1.

2.

38. The detection device according to any one of claims 20 to 37, characterized in that The square magnification of the target image is greater than or equal to 2.

39. A detection device for an electrode assembly, characterized in that: The device comprises a memory and a processor, wherein the memory is used to store instructions, and the processor is used to read the instructions and execute the method according to any one of claims 1 to 19 according to the instructions.

40. A radiation detection device, characterized in that: The radiation detection equipment comprises a radiation source and the device as claimed in any one of claims 20 to 39.

41. A chip, characterized in that: It comprises: a processor, used to call and run a computer program from a memory, so that a device equipped with the chip executes the method as claimed in any one of claims 1 to 19.

42. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and when the computer program is executed by a computer, the computer implements the method as claimed in any one of claims 1 to 19.

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