Method, device and equipment for overhang detection of battery pole piece, storage medium

Abstract

Provided are an Overhang detection method, device, and equipment for a battery pole piece, and a storage medium. The Overhang detection method for a battery pole piece comprises: acquiring an image of a battery pole piece; determining the positions of a plurality of pole edges in the image; wherein the plurality of pole edges are pole edges related to Overhang measurement values corresponding to the image; the position of each pole edge is determined based on a region in which each pole edge is located, and the region in which each pole edge is located is a dynamically determined region; and the Overhang measurement values corresponding to the image are determined according to the positions of the plurality of pole edges. The detection method is used to improve the flexibility and adaptability of Overhang measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery detection, in particular to a battery pole piece Overhang detection method, device, equipment and storage medium. BACKGROUND

[0002] A lamination machine is used in a lamination forming process of a battery, and can compound a cathode, an anode and a diaphragm of the battery. For a compound pole piece, the Overhang (a part of the negative pole piece length and width direction that is outside the positive and negative pole pieces) size needs to be measured to determine whether the compound pole piece meets the requirements.

[0003] The existing Overhang measurement technology adopts a traditional fixed region fitting straight line scheme, positions each pole piece edge in the fixed region, and then determines the Overhang measurement value based on the positioning result of each pole piece edge. In this way, the positioning method relies on a fixed region, and the flexibility is poor. Due to the poor flexibility, the adaptability is also poor in actual application. SUMMARY

[0004] The purpose of the present application is to provide a battery pole piece Overhang detection method, device, equipment and storage medium to improve the flexibility and adaptability of Overhang measurement.

[0005] In the first aspect, the present application provides a battery pole piece Overhang detection method, comprising: acquiring an image of a battery pole piece; determining the positions of a plurality of pole piece edges in the image; wherein the plurality of pole piece edges are pole piece edges related to the Overhang measurement value corresponding to the image; the position of each pole piece edge is determined based on the region where the pole piece edge is located, and the region where each pole piece edge is located is a dynamically determined region; and determining the Overhang measurement value corresponding to the image according to the positions of the plurality of pole piece edges.

[0006] In the present application, when determining the position of each pole piece edge related to the Overhang measurement value corresponding to the image, the position of each pole piece edge is determined based on the region where the pole piece edge is located, and the region where each pole piece edge is located is a dynamically determined region. Compared with the prior art, instead of using the traditional fixed region fitting straight line scheme, the position of each pole piece edge is determined based on the dynamically determined region. Since the region is no longer fixed, the positioning of each pole piece edge is more flexible, for example, without the need to predefine the region where each pole piece edge is located. Therefore, this method can improve the flexibility of the positioning of each pole piece edge, and further improve the flexibility of Overhang measurement. On the basis of improving the flexibility, the adaptability of Overhang measurement is also improved, for example, without considering the fixed region positioning, the Overhang measurement can be adapted to more complex environments.

[0007] As a possible implementation manner, the area where each pole piece edge is located is an area determined based on preset area parameter information, or an area determined based on the positions of one or more pole piece edges.

[0008] In the present application, the area where each pole piece edge is located can be determined based on preset area parameter information, or determined based on the positions of one or more pole piece edges, so that the positioning manner of each pole piece edge is more flexible.

[0009] As a possible implementation manner, the image includes: a first pole piece edge and a second pole piece edge; the area where the first pole piece edge is located is determined based on preset area parameter information, and the area where the second pole piece edge is located is determined based on the position of the first pole piece edge and a first position relationship; the first position relationship is a position relationship between the first pole piece edge and the second pole piece edge.

[0010] In the present application, for the first pole piece edge and the second pole piece edge, the area where the first pole piece edge is located can be determined based on preset area parameter information, and the area where the second pole piece edge is located is determined based on the position of the first pole piece edge and a first position relationship, that is, the area where the pole piece edge is located can be flexibly determined in combination with the position of one pole piece edge, thereby improving the flexibility of pole piece edge positioning.

[0011] As a possible implementation manner, the image further includes: a third pole piece edge; the area where the third pole piece edge is located is determined based on the position of the first pole piece edge, the position of the second pole piece edge, and a second position relationship; the second position relationship is a position relationship between the first pole piece edge, the second pole piece edge, and the third pole piece edge.

[0012] In the present application, for the area where the third pole piece edge is located, the area is determined in combination with the position of the first pole piece edge, the position of the second pole piece edge, and the second position relationship, that is, the area where the pole piece edge is located can be flexibly determined in combination with the positions of at least two pole piece edges, thereby improving the flexibility of pole piece edge positioning.

[0013] As a possible implementation manner, the image further includes: a fourth pole piece edge; the area where the fourth pole piece edge is located is determined based on the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge, and a third position relationship; the third position relationship is a position relationship between the first pole piece edge, the second pole piece edge, the third pole piece edge, and the fourth pole piece edge.

[0014] In the present application, for the region where the fourth pole piece edge is located, the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge and the third positional relationship are determined, so that the region where the pole piece edge is located can be flexibly determined in combination with the positions of at least three pole piece edges, improving the flexibility of pole piece edge positioning.

[0015] As a possible implementation manner, the first pole piece edge is a vertical cathode edge, the second pole piece edge includes a vertical anode edge and a horizontal cathode edge, the third pole piece edge includes a horizontal cathode ceramic edge and a horizontal diaphragm edge, and the fourth pole piece edge is a horizontal anode edge.

[0016] In the present application, the pole piece edges related to the measurement value of Overhang include a vertical cathode edge, a vertical anode edge, a horizontal cathode edge, a horizontal cathode ceramic edge, a horizontal diaphragm edge and a horizontal anode edge. Based on the positioning manner of the dynamic region, flexible positioning of these pole piece edges is realized, and flexible determination of the measurement value of Overhang is realized.

[0017] As a possible implementation manner, the measurement value of Overhang corresponding to the image is determined according to the positions of the plurality of pole piece edges, including: determining the distance between the cathode ceramic pole piece and the diaphragm according to the position of the horizontal cathode ceramic edge and the position of the horizontal diaphragm edge; determining the distance between the anode and the diaphragm according to the position of the horizontal anode edge and the position of the horizontal diaphragm edge; determining the first distance between the cathode and the anode according to the position of the horizontal cathode edge and the position of the horizontal anode edge; determining the second distance between the cathode and the anode according to the position of the vertical cathode edge and the position of the vertical anode edge; determining the distance between the anode and the cathode ceramic pole piece according to the position of the horizontal anode edge and the position of the horizontal cathode ceramic edge; determining the cathode piece width according to the position of the vertical cathode edge; determining the anode piece width according to the position of the vertical anode edge; determining the measurement value of Overhang corresponding to the image according to the distance between the cathode ceramic pole piece and the diaphragm, the distance between the anode and the diaphragm, the first distance, the second distance, the distance between the anode and the cathode ceramic pole piece, the cathode piece width and the anode piece width.

[0018] In the present application, by determining the distance between the cathode ceramic pole piece and the diaphragm, the distance between the anode and the diaphragm, the first distance, the second distance, the distance between the anode and the cathode ceramic pole piece, the cathode piece width and the anode piece width, accurate determination of the measurement value of Overhang corresponding to the image is realized.

[0019] As a possible implementation manner, the image includes multiple images of the battery pole piece, and the multiple images correspond to different regions of the battery pole piece respectively; the detection method further includes: determining the measurement value of the Overhang corresponding to the battery pole piece according to the measurement value of the Overhang corresponding to each of the multiple images and the positional relationship between the different regions.

[0020] In the present application, the images of different regions of the battery pole piece are collected, and then the measurement values of the corresponding Overhang are determined respectively. Compared with the determination mode of the overall image, on the one hand, the processing mode of the image is more flexible; on the other hand, the fine-grained image processing precision is higher, and the final measurement result is more accurate.

[0021] As a possible implementation manner, the multiple images correspond to the four corner regions of the battery pole piece respectively.

[0022] In the present application, the four corner regions of the battery pole piece have symmetry, which can not only ensure the generality or consistency of the processing mode of each image, but also facilitate the determination of the measurement value of the Overhang of the battery pole piece based on the measurement values of the Overhang of the multiple images.

[0023] As a possible implementation manner, for any one pole piece edge, the determination process of the position of the pole piece edge includes: determining the position of the edge transition point in the region where the pole piece edge is located according to the position of the region where the pole piece edge is located; and determining the position of the pole piece edge based on the position of the edge transition point and a straight line fitting algorithm.

[0024] In the present application, based on the dynamically determined region of each pole piece edge, the position of the edge transition point in the region where the pole piece edge is located is determined first, and then the position of the pole piece edge is effectively and accurately positioned based on the position of the edge transition point and the straight line fitting algorithm.

[0025] In a second aspect, the present application provides a battery pole piece Overhang detection device, which includes: various functional modules for implementing the battery pole piece Overhang detection method in the first aspect and any possible implementation manner of the first aspect.

[0026] In a third aspect, the present application provides a battery pole piece Overhang detection device, which includes: a processor; and a memory connected with the processor in communication; the memory stores instructions executable by the processor, and the instructions are executed by the processor to enable the processor to execute the battery pole piece Overhang detection method as described in the first aspect and any possible implementation manner of the first aspect.

[0027] In a fourth aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program, when executed by a computer, performs the battery tab Overhang detection method in the first aspect and any possible implementation manner of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0029] Figure 1 The structural schematic diagram of the image acquisition device provided by the embodiments of the present application is shown in the figure.

[0030] Figure 2 The first example diagram of the image provided by the embodiments of the present application is shown in the figure.

[0031] Figure 3 The second example diagram of the image provided by the embodiments of the present application is shown in the figure.

[0032] Figure 4 The flow chart of the battery tab Overhang detection method provided by the embodiments of the present application is shown in the figure.

[0033] Figure 5 The structural schematic diagram of the battery tab Overhang detection device provided by the embodiments of the present application is shown in the figure.

[0034] Figure 6 The structural schematic diagram of the battery tab Overhang detection device provided by the embodiments of the present application is shown in the figure.

[0035] Figure: 100-image acquisition device; 101-camera; 102-light source; 103-clamp plate; 600-battery tab Overhang detection device; 510-acquisition module; 520-position determination module; 530-measurement value determination module; 600-battery tab Overhang detection device; 610-processor; 620-memory. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described in combination with the 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.

[0037] 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 use of the terms "including," "comprising," "having" and "with" in the specification and claims, along with their derivatives, are intended to be open-ended.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second" and the like 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 technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0039] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] 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, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0041] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0042] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0043] With the more and more widely application of battery, the production process technology of battery is also developing. At present, the battery process mainly includes winding and laminating two kinds, which involves the compounding of the cathode, anode and diaphragm of the battery to obtain a composite sheet. For the composite sheet, the Overhang size needs to be measured.

[0044] In the existing Overhang measurement technology, a traditional fixed region fitting straight line scheme is adopted to position each tab edge in a fixed region, and then determine the Overhang measurement value based on the positioning result of each tab edge. For example, an image of the battery tab is collected, and the region where the anode edge is located and the region where the cathode edge is located are pre-fixed regions in the image. Then, straight line fitting is performed in the fixed region where the anode edge is located to position the anode edge, and straight line fitting is performed in the fixed region where the cathode edge is located to position the cathode edge. Finally, the positioning result of the anode edge and the positioning result of the cathode edge are used to determine the Overhang measurement value.

[0045] The applicant finds that although this measurement method can realize the measurement of Overhang, due to the use of fixed regions for tab edge positioning, the flexibility and adaptability of Overhang measurement are poor. For example, this measurement method is only suitable for offline measurement and cannot be used for online measurement in the battery process. For another example, the image acquisition method of this measurement method is limited and can only acquire images based on fixed regions, cannot flexibly change the image acquisition method, and thus cannot be applied to complex environments.

[0046] After careful consideration by the applicant, the essential reason for the poor flexibility and adaptability of the above measurement method is that positioning is based on fixed regions. For example, because positioning needs to be based on fixed regions, if online measurement is used, the fixed region may not be accurately positioned, so offline measurement must be used. For another example, because positioning needs to be based on fixed regions, the collected image must include the fixed region, so the image acquisition method cannot be arbitrarily changed and applied to complex environments.

[0047] Then, if the positioning of each tab edge no longer relies on fixed regions but relies on flexible and variable regions, it will not be limited by fixed regions, greatly improving flexibility and adaptability.

[0048] Based on the above considerations, the applicant designs a technical solution to reduce the limitations of Overhang measurement and improve the flexibility and adaptability of Overhang measurement.

[0049] In this technical solution, instead of using the traditional fixed region fitting straight line scheme, the positions of each tab edge are determined based on dynamically determined regions. Because the regions are no longer fixed, the positioning of each tab edge is more flexible, such as not needing to predefine the regions where each tab edge is located, so it is suitable for both offline measurement and online measurement.

[0050] Therefore, the method can improve the flexibility of positioning of the edges of the respective pole pieces, and further improve the flexibility of Overhang measurement. On the basis of the improved flexibility, the adaptability of Overhang measurement is also improved, for example, without considering the positioning of the fixed area, the image acquisition method is more flexible, and can be adapted to more complex environments for Overhang measurement.

[0051] The technical scheme provided by the embodiment of the application can be used in a battery manufacturing process, including a lamination process and a winding process, to measure the Overhang of the composite battery pole piece. The measured value of the Overhang can be used to determine whether the composite battery pole piece meets the specifications.

[0052] The technical scheme provided by the embodiment of the application can be applied to an Overhang detection system of a battery pole piece. The detection system can be part of a lamination machine or a winding machine, or can be independent of the lamination machine or the winding machine.

[0053] In the Overhang detection system of the battery pole piece, the Overhang detection device of the battery pole piece and the image acquisition device are communicatively connected.

[0054] The image acquisition device is used to acquire images of the battery pole piece, the Overhang detection device is used to control the image acquisition device, and the Overhang measurement is realized based on the images acquired by the image acquisition device. Of course, in some embodiments, the control of the image acquisition device can also be realized by other control devices, and is not limited to being realized by the Overhang detection device. Moreover, the Overhang detection device can be understood as an intelligent device with data processing and data storage capabilities, or an intelligent controller, an intelligent processor, etc.

[0055] Please refer to Figure 1 The structure of the image acquisition device provided by the embodiment of the application is shown in the schematic diagram. The image acquisition device includes a camera 101, a light source 102, and a clamping plate 103.

[0056] The technical scheme provided by the embodiment of the application is used for Overhang detection of the composite pole piece. In the battery manufacturing process, after the battery pole piece is compounded, it is transmitted to the next processing node, that is, the composite battery pole piece moves along a preset moving direction.

[0057] For the composite battery pole piece, it includes a front surface and a back surface, and the pole piece structure is in sequence: cathode, separator, anode, separator, and cathode. In the preset moving direction, the cathodes are separate sheet structures.

[0058] Therefore, one part of the clamping plate 103 is arranged on the front side of the pole piece, and the other part is arranged on the back side of the pole piece. When it is necessary to collect an image, the corresponding control device controls the two parts of the clamping plate 103 to clamp the pole piece, so as to realize stable collection of the image.

[0059] Since the front and back sides of the pole piece are symmetrical in structure, the Overhang measurement can be realized by collecting an image from the front side or from the back side. In some embodiments, the camera 101 can include a front camera module and / or a back camera module. Figure 1 The front camera module and the back camera module are included in the camera 101.

[0060] Correspondingly, when the camera 101 includes the front camera module, the light source 102 includes the light source of the front camera module; when the camera 101 includes the back camera module, the light source 102 includes the light source of the back camera module; and when the camera 101 includes the front camera module and the back camera module, the light source 102 includes the light source of the front camera module and the light source of the back camera module. Figure 1 In some embodiments, the light source of the front camera module includes a front light source and a back light source, and the light source of the back camera module also includes a front light source and a back light source.

[0061] The light source 102 is used for lighting the pole piece, so as to facilitate the camera to collect an image. The front light source is used for front lighting, and the back light source is used for back lighting. The light source 102 can be a flash, an illuminating lamp, etc., which is not limited herein.

[0062] In addition, in the technical solution of the embodiments of the present application, the front camera module and / or the back camera module can be provided with one camera or multiple cameras.

[0063] If one camera 101 is provided, the camera 101 is used for collecting a complete image of the battery pole piece corresponding to one piece of cathode. The camera 101 can be a large field-of-view linear array camera meeting the frame rate requirement.

[0064] If multiple cameras 101 are provided, the multiple cameras 101 are respectively used for collecting images of different fields of view of the battery pole piece corresponding to one piece of cathode, for example, images of four corner regions. At this time, the multiple cameras 101 can be high-frame-rate small field-of-view area array cameras.

[0065] For the convenience of understanding, please refer to Figure 2 and Figure 3 If one camera 101 is provided, the collected image can be as shown in Figure 2 In Figure 2 , multiple fields of view are included, and the images of the multiple fields of view can be collected by multiple cameras; if multiple cameras 101 are provided, the collected image is an image of a different field of view based on the overall image, as shown in Figure 2 Figure 3 ​The image shown is the image of the field of view 3. It should be noted that if there is only one camera 101, there should only be one field of view, which includes the complete image of the pole piece; in Figure 2 The field of view marked in the middle is only for the convenience of understanding Figure 3 The corresponding relationship with the field of view 3.

[0066] Based on the introduction of the above invention concept and application scenario, please refer to Figure 4 The flowchart of the Overhang detection method of the battery pole piece provided by the embodiment of the application, the detection method comprises:

[0067] Step 410: obtaining the image of the battery pole piece.

[0068] Step 420: determining the positions of the multiple pole piece edges in the image. Wherein, the multiple pole piece edges are the pole piece edges related to the Overhang measurement value corresponding to the image; the position of each pole piece edge is determined based on the region where each pole piece edge is located, and the region where each pole piece edge is located is a dynamically determined region.

[0069] Step 430: determining the Overhang measurement value corresponding to the image according to the positions of the multiple pole piece edges.

[0070] In combination with the introduction of the above application scenario, in step 410, the image of the battery pole piece can be an image of a complete battery pole piece, or an image of different regions (different fields of view) of the battery pole piece.

[0071] Correspondingly, the image in step 410 can be one image or multiple images. Whether it is one image or multiple images, the corresponding image processing method is the same.

[0072] In combination with the introduction of the foregoing image acquisition device, in step 410, the image sent by the front camera module and / or the back camera module is received.

[0073] In step 420, the positions of the multiple pole piece edges in the image are determined, and the multiple pole piece edges are the pole piece edges related to the Overhang measurement value corresponding to the image.

[0074] It can be understood that since multiple images can be obtained in step 410, the multiple images correspond to different fields of view of the battery pole piece. In this case, the Overhang measurement value determined based on the image cannot represent the final Overhang measurement value, and the final Overhang measurement value needs to be determined based on the Overhang measurement values determined based on the multiple images, so in step 420, the multiple pole piece edges are defined as the pole piece edges related to the Overhang measurement value corresponding to the image.

[0075] In the embodiments of the present application, the positions of the edges of the pole pieces are determined based on the regions in which the edges of the pole pieces are located, and the regions in which the edges of the pole pieces are located are dynamically determined. Since the regions in which some of the edges of the pole pieces are located are dynamically determined, the positions of the edges of the pole pieces may need to be determined in combination with the positions of other edges of the pole pieces. Therefore, in the embodiments of the present application, the determination of the regions and the determination of the positions of the edges of the pole pieces based on the regions are integrated into step 420. In fact, it should be understood that, after a region in which an edge of a pole piece is located is determined, the position of the edge of the pole piece is determined based on the region in which the edge of the pole piece is located. That is, in the process of determining the positions of the edges of the pole pieces, the determination of the positions of the edges of the pole pieces is accompanied by the dynamic determination of the regions in which the edges of the pole pieces are located.

[0076] In step 430, the Overhang measurement value corresponding to the image is determined according to the positions of the edges of the pole pieces. When step 410 and step 420 adopt different embodiments, step 430 may also have multiple embodiments, which are described in detail in subsequent embodiments.

[0077] In the embodiments of the present application, when the positions of the edges of the pole pieces related to the Overhang measurement value corresponding to the image are determined, the positions of the edges of the pole pieces are determined based on the regions in which the edges of the pole pieces are located, and the regions in which the edges of the pole pieces are located are dynamically determined. Compared with the prior art, instead of using the traditional fixed-region fitting straight line scheme, the positions of the edges of the pole pieces are determined based on the dynamically determined regions. Since the regions are no longer fixed, the positions of the edges of the pole pieces are more flexible, for example, the regions in which the edges of the pole pieces are located do not need to be pre-defined. Therefore, this method can improve the flexibility of the determination of the positions of the edges of the pole pieces, and further improve the flexibility of the Overhang measurement. On the basis of the improved flexibility, the adaptability of the Overhang measurement is also improved, for example, the Overhang measurement can be adapted to more complex environments without considering the fixed-region positioning.

[0078] As an optional embodiment, in step 420, the regions in which the edges of the pole pieces are located are regions determined based on preset region parameter information or regions determined based on the positions of one or more edges of the pole pieces.

[0079] The preset region parameter information is parameter information used for positioning the regions, for example, region boundary point pixel coordinates, region length, region width, etc.

[0080] In some embodiments, the region in which a first edge of a pole piece whose position is to be determined among the edges of the pole pieces is located is determined based on preset region parameter information, and the regions in which the edges of the pole pieces whose positions are to be determined after the first edge of the pole piece are located are determined based on the position of the first edge of the pole piece whose position is to be determined or in combination with the positions of the edges of the pole pieces whose positions have been determined.

[0081] In the embodiments of the present application, the area where each pole piece edge is located can be determined based on preset area parameter information, or can be determined based on the position of one or more pole piece edges, so that the positioning mode of each pole piece edge is more flexible.

[0082] As an optional implementation, the image includes: a first pole piece edge and a second pole piece edge; the area where the first pole piece edge is located is determined based on preset area parameter information, and the area where the second pole piece edge is located is determined based on the position of the first pole piece edge and a first position relationship; and the first position relationship is the position relationship between the first pole piece edge and the second pole piece edge.

[0083] The first pole piece edge can be understood as a first pole piece edge whose position is to be determined, and the second pole piece edge can be understood as a second pole piece edge whose position is to be determined.

[0084] Correspondingly, for the first pole piece edge, the position determination process includes: determining the area where the first pole piece edge is located based on preset area parameter information; and determining the position of the first pole piece edge based on the area where the first pole piece edge is located.

[0085] For the second pole piece edge, the position determination process includes: determining the area where the second pole piece edge is located based on the position of the first pole piece edge and a first position relationship; and determining the position of the second pole piece edge based on the area where the second pole piece edge is located.

[0086] The first position relationship is the position relationship between the first pole piece edge and the second pole piece edge, for example, the first pole piece edge is on the left of the second pole piece edge, on the top of the second pole piece edge, etc. Based on the position relationship, when the position of the first pole piece edge is determined, the area where the second pole piece edge is located can also be determined. For example, if the first pole piece edge is on the top of the second pole piece edge, then the area where the second pole piece edge is located is the area below the position of the first pole piece edge.

[0087] In the embodiments of the present application, for the first pole piece edge and the second pole piece edge, the area where the first pole piece edge is located can be determined based on preset area parameters, and the area where the second pole piece edge is located is determined based on the position of the first pole piece edge and a first position relationship, that is, the area where the pole piece edge is located can be flexibly determined in combination with the position of one pole piece edge, thereby improving the flexibility of pole piece edge positioning.

[0088] As an optional mode, the image can further include: a third pole piece edge; the area where the third pole piece edge is located is determined based on the position of the first pole piece edge, the position of the second pole piece edge, and a second position relationship; and the second position relationship is the position relationship between the first pole piece edge, the second pole piece edge, and the third pole piece edge.

[0089] The third pole piece edge can be understood as a pole piece edge whose position is to be determined after the second pole piece edge, and the area where the pole piece edge is located needs to be determined in combination with the positions of the first pole piece edge and the second pole piece edge.

[0090] Correspondingly, the process of determining the position of the third pole piece edge includes: determining the region where the third pole piece edge is based on the position of the first pole piece edge, the position of the second pole piece edge and the second position relationship; and determining the position of the third pole piece edge based on the region where the third pole piece edge is.

[0091] The second position relationship is the position relationship among the first pole piece edge, the second pole piece edge and the third pole piece edge. For example, the third pole piece edge is below the first pole piece edge and left of the second pole piece edge. Based on the position relationship, when the position of the first pole piece edge and the position of the second pole piece edge are determined, the region where the third pole piece edge is can also be determined. For example, the region where the third pole piece edge is is below the position where the first pole piece edge is and left of the position where the second pole piece edge is.

[0092] In the embodiments of the present application, for the region where the third pole piece edge is, the position of the first pole piece edge, the position of the second pole piece edge and the second position relationship are combined to determine, that is, the region where the pole piece edge is can be flexibly determined in combination with the positions of at least two pole piece edges, thereby improving the flexibility of the positioning of the pole piece edge.

[0093] As an optional implementation, the image can further include: a fourth pole piece edge; the region where the fourth pole piece edge is is determined based on the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge and a third position relationship; and the third position relationship is the position relationship among the first pole piece edge, the second pole piece edge, the third pole piece edge and the fourth pole piece edge.

[0094] The fourth pole piece edge can be understood as a pole piece edge at a to-be-determined position after the third pole piece edge, and the region where the fourth pole piece edge is is determined in combination with the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge and the third position relationship.

[0095] Correspondingly, the process of determining the position of the fourth pole piece edge includes: determining the region where the fourth pole piece edge is based on the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge and the third position relationship; and determining the position of the fourth pole piece edge according to the region where the fourth pole piece edge is.

[0096] The third position relationship is the position relationship among the first pole piece edge, the second pole piece edge, the third pole piece edge and the fourth pole piece edge. For example, the fourth pole piece edge is below the first pole piece edge, left of the second pole piece edge and above the third pole piece edge. Based on the position relationship, when the position of the first pole piece edge, the position of the second pole piece edge and the position of the third pole piece edge are determined, the region where the fourth pole piece edge is can also be determined. For example, the region where the fourth pole piece edge is is below the position where the first pole piece edge is, left of the position where the second pole piece edge is and above the position where the third pole piece edge is.

[0097] In the embodiment of the present application, for the region where the fourth pole piece edge is located, the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge and the third positional relationship are combined to determine the region where the pole piece edge is located, so that the region where the pole piece edge is located can be flexibly determined in combination with the positions of at least three pole piece edges, thereby improving the flexibility of the pole piece edge positioning.

[0098] It can be understood that when more pole piece edges are involved, more pole piece edges can be combined to determine the region where the pole piece edge is located, which is not limited herein.

[0099] As an optional implementation, the first pole piece edge is a vertical cathode edge, the second pole piece edge includes a vertical anode edge and a horizontal cathode edge, the third pole piece edge includes a horizontal cathode ceramic edge and a horizontal diaphragm edge, and the fourth pole piece edge is a horizontal anode edge.

[0100] This implementation can be used as the implementation of each pole piece edge corresponding to the image shown in the foregoing Figure 3 When the image in step 410 is the image shown in Figure 3 , each pole piece edge is the pole piece edge described in this implementation.

[0101] In this implementation, in step 420, the region where the vertical cathode edge is located is first determined in combination with the preset region parameter information, and then the position of the vertical cathode edge is determined based on the region where the vertical cathode edge is located. Then, the region where the vertical anode edge is located is determined based on the position of the vertical cathode edge and the positional relationship between the vertical cathode edge and the vertical anode edge, and the position of the vertical anode edge is determined based on the region where the vertical anode edge is located; and the region where the horizontal cathode edge is located is determined based on the position of the vertical cathode edge and the positional relationship between the vertical cathode edge and the horizontal cathode edge, and the position of the horizontal cathode edge is determined based on the region where the horizontal cathode edge is located.

[0102] Then, the region where the horizontal cathode ceramic edge is located is determined based on the position of the vertical cathode edge, the position of the vertical anode edge and / or the horizontal cathode edge, and the positional relationship between the vertical cathode edge, the vertical anode edge and / or the horizontal cathode edge and the horizontal cathode ceramic edge, and the position of the horizontal cathode ceramic cup is determined based on the region where the horizontal cathode ceramic edge is located. The position of the horizontal diaphragm edge is determined by referring to the position determination process of the horizontal cathode ceramic edge, which will not be described herein again.

[0103] Then, based on the position of the vertical cathode edge, the position of at least one of the vertical anode edge and the horizontal cathode edge, the position of at least one of the horizontal cathode ceramic edge and the horizontal separator edge, and the positional relationship between at least one of the vertical cathode edge, the vertical anode edge and the horizontal cathode edge, at least one of the horizontal cathode ceramic edge and the horizontal separator edge, and the horizontal anode edge, the region where the horizontal anode edge is located is determined, and the position of the horizontal anode edge is determined according to the region where the horizontal anode edge is located.

[0104] In the embodiments of the present application, the pole edges related to the measurement value of Overhang include the vertical cathode edge, the vertical anode edge, the horizontal cathode edge, the horizontal cathode ceramic edge, the horizontal separator edge, and the horizontal anode edge. The flexible positioning of these pole edges is achieved by the positioning mode based on the dynamic region, and the flexible determination of the measurement value of Overhang is achieved.

[0105] Further, based on the above-mentioned various pole edges, as an optional implementation, step 430 includes: determining the distance between the cathode ceramic pole piece and the separator according to the position of the horizontal cathode ceramic edge and the position of the horizontal separator edge; determining the distance between the anode and the separator according to the position of the horizontal anode edge and the position of the horizontal separator edge; determining the first distance between the cathode and the anode according to the position of the horizontal cathode edge and the position of the horizontal anode edge; determining the second distance between the cathode and the anode according to the position of the vertical cathode edge and the position of the vertical anode edge; determining the distance between the anode and the cathode ceramic pole piece according to the position of the horizontal anode edge and the position of the horizontal cathode ceramic edge; determining the cathode piece width according to the position of the vertical cathode edge; determining the anode piece width according to the position of the vertical anode edge; and determining the measurement value of Overhang corresponding to the image according to the distance between the cathode ceramic pole piece and the separator, the distance between the anode and the separator, the first distance, the second distance, the distance between the anode and the cathode ceramic pole piece, the cathode piece width, and the anode piece width.

[0106] This implementation can be used as the implementation of the determination of the measurement value of Overhang corresponding to the image as described above. Figure 3 The determination of the measurement value of Overhang corresponding to the image as shown in the implementation of step 410, i.e., when the image in step 410 is Figure 3 The determination of the measurement value of Overhang corresponding to the image as shown in the implementation of step 410, i.e., when the image in step 410 is

[0107] In the embodiments of the present application, the measurement value of Overhang can not refer to a specific value, but refer to the value of the related measurement item, i.e., any one or more of the distance between the cathode ceramic pole piece and the separator, the distance between the anode and the separator, the first distance, the second distance, the distance between the anode and the cathode ceramic pole piece, the cathode piece width, and the anode piece width.

[0108] Based on these measurement values, the final Overhang measurement value can be determined by integration, or the measurement values can be directly used as the final Overhang measurement value. Correspondingly, when evaluating the Overhang measurement value, the integrated Overhang measurement value can be compared with the standard integrated Overhang measurement value to evaluate whether the composite battery pole piece meets the standard. Alternatively, each measurement value can be compared with the corresponding standard measurement value, and the multiple comparison results can be combined to evaluate whether the composite battery pole piece meets the standard.

[0109] The distance between the cathode ceramic pole piece edge and the separator can be the distance between the cathode ceramic pole piece edge and the separator in the vertical direction. The distance between the anode and the separator can be the distance between the anode and the separator in the vertical direction. The first distance between the cathode and the anode can be the distance between the horizontal cathode edge and the horizontal anode edge in the vertical direction. The second distance between the cathode and the anode can be the distance between the vertical cathode edge and the vertical anode edge in the horizontal direction. The distance between the anode and the cathode ceramic pole piece can be the distance between the horizontal anode edge and the cathode ceramic pole piece edge in the vertical direction.

[0110] In some embodiments, the cathode tab width is the distance between the position of the vertical cathode edge in the image and the position of the vertical cathode edge in Figure 3 The distance between the position of the vertical cathode edge in the image and the position of the vertical cathode edge in Figure 3 The distance between the position of the vertical cathode edge in the image and the position of the vertical cathode edge in Figure 3 The distance between the position of the vertical anode edge in the image and the position of the vertical anode edge in Figure 3 The distance between the position of the vertical anode edge in the image and the position of the vertical anode edge in

[0111] Of course, if the image includes the vertical cathode edges on both sides or the vertical anode edges on both sides, the cathode tab width can be directly determined according to the positions of the vertical cathode edges on both sides, and the anode tab width can be directly determined according to the positions of the vertical anode edges on both sides.

[0112] In the embodiments of the present application, by determining the distance between the cathode ceramic pole piece and the separator, the distance between the anode and the separator, the first distance, the second distance, the distance between the anode and the cathode ceramic pole piece, the cathode tab width, and the anode tab width, the accurate determination of the Overhang measurement value corresponding to the image is realized.

[0113] In the foregoing embodiments, it is mentioned that the image in step 410 can include multiple images, and the multiple images correspond to different regions of the battery pole piece respectively. In this implementation, after step 430, the detection method further includes: determining the Overhang measurement value corresponding to the battery pole piece according to the Overhang measurement values corresponding to the multiple images and the positional relationship between the different regions.

[0114] According to the positional relationship between different regions, the integration manner of the measurement values corresponding to different images can be determined.

[0115] In some embodiments, if the different regions are symmetrical regions, the integration manner of the measurement values corresponding to different images is, for example, addition or addition followed by division by a preset value, etc.

[0116] In some other embodiments, if the different regions are asymmetrical regions, the integration manner of the measurement values corresponding to different images is, for example, weighted average, weighted summation, etc.

[0117] It can be understood that the specific integration manner can be flexibly set in combination with specific application scenarios, which is not limited herein. Moreover, which integration manner is adopted can be determined through pre-data simulation, data test, etc.

[0118] In the embodiments of the present application, images of different regions of the battery pole piece are collected, and then the measurement values of the corresponding Overhang are determined. Compared with the determination manner of the overall image, on the one hand, the image processing manner is more flexible; on the other hand, the fine-grained image processing precision is higher, and the final measurement result is also more accurate.

[0119] As an optional implementation, a plurality of images respectively correspond to the four corner regions of the battery pole piece.

[0120] In this implementation, the images of the four corner regions of the battery pole piece, i.e., the battery pole piece in the four corner fields of view, are collected. The image collected in one of the fields of view can refer to the foregoing Figure 5 as shown.

[0121] In the embodiments of the present application, the four corner regions of the battery pole piece have symmetry, which not only can ensure the generality or consistency of the processing manner of each image, but also facilitates the determination of the measurement value of the Overhang of the battery pole piece based on the measurement values of the Overhang of the plurality of images.

[0122] In some other embodiments, a plurality of images can also respectively correspond to any two diagonal regions of the battery pole piece, or regions where specified positions are located, etc., which is not limited in the embodiments of the present application.

[0123] As an optional implementation, on the basis of the determined region where the pole piece edge is located, the position determination process of the pole piece edge can include: determining the position of the edge transition point in the region where the pole piece edge is located according to the position of the region where the pole piece edge is located; and determining the position of the pole piece edge based on the position of the edge transition point and a straight line fitting algorithm.

[0124] In this embodiment, the positioning of the pole piece edge is achieved by using a straight line fitting method. It can be understood that the pole piece edge is a straight line in the image, and after the region where the straight line is located is determined, the positioning of the edge transition point can be performed by using the white-to-black method in the region where the straight line is located, and the position of the edge transition point is the approximate position of the straight line. However, since the edge transition point may not be on a straight line, a straight line fitting algorithm is further used to perform straight line fitting on the edge transition points to accurately position the position of the pole piece edge.

[0125] In some embodiments, the straight line fitting algorithm can be a least square method. Of course, other straight line fitting algorithms can also be used, which are not limited herein.

[0126] In some embodiments, for the first pole piece edge described above, before the determination of the edge transition point, a region rough positioning can also be performed based on the region where the first pole piece edge is located to find the region of interest, and then the edge transition point is determined based on the region of interest.

[0127] In the embodiments of the present application, based on the region dynamically determined for each pole piece edge, the position of the edge transition point in the region where the pole piece edge is located is determined, and then the position of the pole piece edge is effectively and accurately positioned based on the position of the edge transition point and the straight line fitting algorithm.

[0128] It can be understood that based on the region where the pole piece edge is located, other feasible straight line positioning methods can also be used to position the pole piece edge, for example, referring to the method of fitting the position of the pole piece edge based on a fixed region, which is not limited herein.

[0129] Please refer to Figure 6 The embodiments of the present application also provide a battery pole piece Overhang detection device 500, which corresponds to the battery pole piece Overhang detection method described above, and includes an acquisition module 510, a position determination module 520, and a measurement value determination module 530.

[0130] The acquisition module 510 is configured to acquire an image of a battery pole piece; the position determination module 520 is configured to determine the positions of a plurality of pole piece edges in the image; wherein the plurality of pole piece edges are pole piece edges related to an Overhang measurement value corresponding to the image; the position of each pole piece edge is determined based on a region where the pole piece edge is located, and the region where the pole piece edge is located is a dynamically determined region; and the measurement value determination module 530 is configured to determine the Overhang measurement value corresponding to the image according to the positions of the plurality of pole piece edges.

[0131] In the embodiment of the present application, the measurement value determination module 530 is specifically configured to: determine the distance between the cathode ceramic tab and the separator according to the position of the horizontal cathode ceramic edge and the position of the horizontal separator edge; determine the distance between the anode and the separator according to the position of the horizontal anode edge and the position of the horizontal separator edge; determine the first distance between the cathode and the anode according to the position of the horizontal cathode edge and the position of the horizontal anode edge; determine the second distance between the cathode and the anode according to the position of the vertical cathode edge and the position of the vertical anode edge; determine the distance between the anode and the cathode ceramic tab according to the position of the horizontal anode edge and the position of the horizontal cathode ceramic edge; determine the cathode tab width according to the position of the vertical cathode edge; determine the anode tab width according to the position of the vertical anode edge; and determine the measurement value of the Overhang corresponding to the image according to the distance between the cathode ceramic tab and the separator, the distance between the anode and the separator, the first distance, the second distance, the distance between the anode and the cathode ceramic tab, the cathode tab width and the anode tab width.

[0132] In the embodiment of the present application, the measurement value determination module 530 is further configured to: determine the measurement value of the Overhang corresponding to the battery tab according to the measurement values of the Overhang corresponding to the plurality of images and the positional relationship between the different regions.

[0133] In the embodiment of the present application, for any one tab edge, the position determination module 520 is specifically configured to: determine the position of the edge transition point in the region where the tab edge is located according to the position of the region where the tab edge is located; and determine the position of the tab edge based on the position of the edge transition point and a straight line fitting algorithm.

[0134] Since the battery tab Overhang detection device 500 and the battery tab Overhang detection method correspond to each other, the implementation modes and technical effects of the various functional modules also refer to the implementation modes and technical effects of the foregoing detection method, which will not be repeatedly introduced herein.

[0135] Based on the same inventive concept, please refer to Figure 6 The embodiment of the present application also provides a battery tab Overhang detection device 600, which can serve as an execution subject of the foregoing detection method and comprises: a processor 610; and a memory 620 in communication connection with the processor 610; the memory 620 stores instructions executable by the processor 610, and the instructions are executed by the processor 610 to enable the processor 610 to execute the battery tab Overhang detection method described in the foregoing embodiments.

[0136] Among them, the processor 610 and the memory 620 can be realized by communication bus.

[0137] The detection device comprises, in addition to the components shown, Figure 6 The detection device can further comprise more components, Figure 6 This does not constitute a limitation on the structure thereof.

[0138] The application further provides a computer readable storage medium, and the computer readable storage medium stores a computer program. When the computer program is run by a computer, the battery pole piece Overhang detection method described in the foregoing embodiments is executed.

[0139] In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented by other manners. The apparatus embodiments described above are only schematic, for example, the division of the units is only a logical function division, and another division manner can be used in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some communication interfaces, apparatuses or units, and can be electrical, mechanical or other forms.

[0140] In addition, the units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. According to actual needs, some or all of the units can be selected to achieve the purpose of the embodiments.

[0141] Further, the function modules in each of the embodiments of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0142] The above only describes the embodiments of the present application and does not limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting the overhang of battery electrodes, characterized in that, include: Acquire images of the battery electrodes; The positions of multiple pole pieces in the image are determined; wherein, the multiple pole pieces are pole pieces related to the Overhang measurement value corresponding to the image; the position of each pole piece is determined based on the region where each pole piece is located, and the region where each pole piece is located is a dynamically determined region; The Overhang measurement value corresponding to the image is determined based on the position of the multiple electrode edges.

2. The method for detecting overhang of battery electrodes according to claim 1, characterized in that, The regions where each electrode edge is located are regions determined based on preset region parameter information, or regions determined based on the positions of one or more electrode edges with predetermined positions.

3. The method for detecting the overhang of battery electrodes according to claim 2, characterized in that, The image includes: a first electrode edge and a second electrode edge; the region where the first electrode edge is located is determined based on preset region parameter information, and the region where the second electrode edge is located is determined based on the position of the first electrode edge and a first positional relationship; the first positional relationship is the positional relationship between the first electrode edge and the second electrode edge.

4. The method for detecting overhang of battery electrodes according to claim 3, characterized in that, The image also includes: a third pole piece edge; the region where the third pole piece edge is located is determined based on the position of the first pole piece edge, the position of the second pole piece edge, and a second positional relationship; the second positional relationship is the positional relationship between the first pole piece edge, the second pole piece edge, and the third pole piece edge.

5. The method for detecting the overhang of battery electrodes according to claim 4, characterized in that, The image also includes a fourth pole piece edge; the region where the fourth pole piece edge is located is determined based on the position of the first pole piece edge, the position of the second pole piece edge, the position of the third pole piece edge, and a third positional relationship; the third positional relationship is the positional relationship between the first pole piece edge, the second pole piece edge, the third pole piece edge, and the fourth pole piece edge.

6. The method for detecting the overhang of battery electrodes according to claim 5, characterized in that, The first electrode edge is a vertical cathode edge, the second electrode edge includes a vertical anode edge and a horizontal cathode edge, the third electrode edge includes a horizontal cathode ceramic edge and a horizontal diaphragm edge, and the fourth electrode edge is a horizontal anode edge.

7. The method for detecting the overhang of battery electrodes according to claim 6, characterized in that, The step of determining the Overhang measurement value corresponding to the image based on the positions of multiple pole pieces includes: The spacing between the cathode ceramic electrode and the diaphragm is determined based on the position of the horizontal cathode ceramic edge and the position of the horizontal diaphragm edge. The distance between the anode and the diaphragm is determined based on the positions of the horizontal anode edge and the horizontal diaphragm edge. The first distance between the cathode and the anode is determined based on the position of the horizontal cathode side and the position of the horizontal anode side; The second distance between the cathode and the anode is determined based on the position of the vertical cathode side and the position of the vertical anode side; The spacing between the anode and cathode ceramic plates is determined based on the positions of the horizontal anode edge and the horizontal cathode ceramic edge. The width of the cathode plate is determined based on the position of the vertical cathode edge; The width of the anode plate is determined based on the position of the vertical anode edge; The Overhang measurement value corresponding to the image is determined based on the spacing between the cathode ceramic electrode and the diaphragm, the spacing between the anode and the diaphragm, the first spacing, the second spacing, the spacing between the anode and the cathode ceramic electrode, the cathode width, and the anode width.

8. The method for detecting overhang of battery electrodes according to claim 1, characterized in that, The image includes multiple images of the battery electrode, each image corresponding to a different region of the battery electrode. The detection method further includes: The measured value of the Overhang corresponding to the battery electrode is determined based on the Overhang measurement values ​​corresponding to multiple images and the positional relationship between the different regions.

9. The method for detecting the overhang of battery electrodes according to claim 8, characterized in that, The multiple images correspond to the four corner regions of the battery electrode, respectively.

10. The method for detecting the overhang of battery electrodes according to claim 1, characterized in that, For any given electrode edge, the process of determining the position of that electrode edge includes: The location of the edge transition point in the region where the electrode edge is located is determined based on the location of the region where the electrode edge is located; The position of the electrode edge is determined based on the location of the edge transition point and a straight line fitting algorithm.

11. An overhang detection device for battery electrodes, characterized in that, include: The acquisition module is used to acquire images of the battery electrodes; A position determination module is used to determine the positions of multiple pole pieces in the image; wherein, the multiple pole pieces are pole pieces related to the Overhang measurement value corresponding to the image; the position of each pole piece is determined based on the region where each pole piece is located, and the region where each pole piece is located is a dynamically determined region; The measurement value determination module is used to determine the Overhang measurement value corresponding to the image based on the position of the multiple electrode edges.

12. An overhang detection device for battery electrodes, comprising: processor; and a memory that is communicatively connected to the processor; The memory stores instructions that can be executed by the processor to enable the processor to perform the overhang detection method for battery electrodes as described in any one of claims 1-8.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a computer, performs the overhang detection method for battery electrodes as described in any one of claims 1-8.

Images