Fuel cell bipolar plate coating detection method and device based on image recognition

Abstract

The invention relates to the field of fuel cell bipolar plate coating detection, and discloses a fuel cell bipolar plate coating detection method and device based on image recognition, and the method comprises the steps: determining a runner region corresponding to a runner on a fuel cell bipolar plate in a bipolar plate image, and determining a runner central axis in the runner region; the runner area is divided into two detection areas through the central axis of the runner, the runner coating uniformity corresponding to the two detection areas is determined, and the runner coating uniformity difference value of the runner coating uniformity corresponding to the two detection areas is determined; when the runner coating uniformity difference value is greater than or equal to a preset runner coating uniformity difference value, judging that the coating uniformity of the bipolar plate of the fuel cell is unqualified; and when the runner coating uniformity difference value is smaller than a preset runner coating uniformity difference value, judging that the coating uniformity of the bipolar plate of the fuel cell is qualified. According to the invention, the uniformity of the coating on the bipolar plate of the fuel cell can be detected through image recognition.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cell bipolar plate coating detection, and more specifically, to a fuel cell bipolar plate coating detection method and device based on image recognition. Background Art

[0002] Fuel cell bipolar plates are key components in fuel cell stacks. The main function of fuel cell bipolar plates is to guide reaction gases (such as hydrogen and oxygen) and provide conduction current. The structure of fuel cell metal bipolar plates usually consists of a substrate and a coating. Common materials for the substrate include stainless steel or titanium. Since stainless steel is susceptible to corrosion in acidic environments and is not resistant to high potentials, the corrosion-resistant conductive coating on the stainless steel bipolar plate is particularly important.

[0003] The main function of the bipolar plate surface coating is to protect the bipolar plate from corrosion, improve conductivity and reduce contact resistance. Common coating types include conductive polymer coatings (such as polyaniline and poly (3,4-ethylenedioxythiophene), precious metal coatings (such as platinum and gold), ceramic coatings (such as indium tin oxide) and non-precious metal coatings (such as non-precious metal carbon-based coatings). The flow channels on the fuel cell bipolar plates are uneven, and the area where the flow channels are located will cause uneven reflection and scattering of light, making it difficult to detect the uniformity of the coating on the fuel cell bipolar plates through image recognition. Summary of the invention

[0004] The purpose of this application is to provide a fuel cell bipolar plate coating detection method and device based on image recognition, which solves the technical problem that it is difficult to detect the coating uniformity on the fuel cell bipolar plate through image recognition, and achieves the technical effect of detecting the coating uniformity on the fuel cell bipolar plate.

[0005] An embodiment of the present application provides a fuel cell bipolar plate coating detection method based on image recognition, the method comprising: acquiring a bipolar plate image of a fuel cell bipolar plate provided with a flow channel, determining a flow channel area corresponding to the flow channel on the fuel cell bipolar plate in the bipolar plate image, and determining the flow channel centerline in the flow channel area; dividing the flow channel area into two detection areas through the flow channel centerline, determining the flow channel coating uniformity corresponding to the two detection areas respectively, and determining the flow channel coating uniformity difference of the flow channel coating uniformity corresponding to the two detection areas respectively; when the flow channel coating uniformity difference is greater than or equal to a preset flow channel coating uniformity difference, determining that the coating uniformity of the fuel cell bipolar plate is unqualified; when the flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, determining that the coating uniformity of the fuel cell bipolar plate is qualified.

[0006] In one possible implementation, the method also includes: determining multiple straight segment flow channel areas in the flow channel area, dividing each straight segment flow channel area into two straight segment detection areas through the center axis of the flow channel, and determining the straight segment flow channel coating uniformity corresponding to the two straight segment detection areas of each straight segment flow channel area, and determining the straight segment flow channel coating uniformity difference of the straight segment flow channel coating uniformity corresponding to the two straight segment detection areas of each straight segment flow channel area; when at least one straight segment flow channel coating uniformity difference is greater than or equal to a preset flow channel coating uniformity difference, determining that the coating uniformity of the fuel cell bipolar plate is unqualified; when each straight segment flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, determining that the coating uniformity of the fuel cell bipolar plate is qualified.

[0007] In another possible implementation, the method also includes: determining the straight segment flow channel coating uniformity of two straight segment detection areas from two different straight segment flow channel areas, and determining the difference in the straight segment flow channel coating uniformity of the two straight segment detection areas from two different straight segment flow channel areas as the straight segment flow channel coating uniformity cross difference; wherein, the two straight segment detection areas from two different straight segment flow channel areas are located on the same side of the flow channel; when at least one straight segment flow channel coating uniformity cross difference is greater than or equal to a preset flow channel coating uniformity cross difference, the coating uniformity of the fuel cell bipolar plate is determined to be unqualified; when all flow channel coating uniformity cross differences are less than the preset flow channel coating uniformity cross difference, the coating uniformity of the fuel cell bipolar plate is determined to be qualified.

[0008] In another possible implementation, the method also includes: determining multiple curved section flow channel areas in the flow channel area, dividing each curved section flow channel area into two curved section detection areas through the center axis of the flow channel, and determining the curved section flow channel coating uniformity corresponding to the two curved section detection areas of each curved section flow channel area, and determining the curved section flow channel coating uniformity difference of the curved section flow channel coating uniformity corresponding to the two curved section detection areas of each curved section flow channel area; when at least one curved section flow channel coating uniformity difference is greater than or equal to a preset flow channel coating uniformity difference, determining that the coating uniformity of the fuel cell bipolar plate is unqualified; when each curved section flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, determining that the coating uniformity of the fuel cell bipolar plate is qualified.

[0009] In another possible implementation, the method further includes: dividing each straight segment flow channel area into multiple sub-straight segment flow channel areas, and determining a first sub-straight segment flow channel area located in the middle of the straight segment flow channel area among the multiple sub-straight segment flow channel areas, and obtaining a first curved segment flow channel area at the end of the straight segment flow channel area where the first sub-straight segment flow channel area is located; dividing the first sub-straight segment flow channel area into two first sub-straight segment detection areas through the flow channel centerline, dividing the first curved segment flow channel area into two first curved segment detection areas through the flow channel centerline, and determining the two first sub-straight segment detection areas The coating uniformity of the first sub-straight segment corresponding to each other and the coating uniformity of the first curved segment corresponding to each of the two first curved segment detection areas are determined, and the first sub-coating uniformity difference of the coating uniformity of the first sub-straight segment detection area and the coating uniformity of the first curved segment detection area on the same side of the flow channel is determined; when the first sub-coating uniformity difference is greater than or equal to the preset first sub-coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be unqualified; when all the first sub-coating uniformity differences are less than the preset first sub-coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be qualified.

[0010] In another possible implementation, the method also includes: determining the plane area other than the flow channel at the four corners of the fuel cell bipolar plate in the bipolar plate image, and determining the plane coating uniformity of the plane area, and determining the plane coating uniformity difference between different plane coating uniformities; when the plane coating uniformity difference is greater than or equal to the preset plane coating uniformity difference, it is determined that the coating uniformity of the fuel cell bipolar plate is unqualified; when all plane coating uniformity differences are less than the preset plane coating uniformity difference, it is determined that the coating uniformity of the fuel cell bipolar plate is qualified.

[0011] An embodiment of the present application also provides a fuel cell bipolar plate coating uniformity assessment device based on image recognition, comprising a unit for executing any of the methods described above.

[0012] An embodiment of the present application also provides a fuel cell bipolar plate coating uniformity assessment device based on image recognition, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the methods described above when executing the computer program.

[0013] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any one of the above items is implemented.

[0014] An embodiment of the present application further provides a computer program product, including a computer program, which implements the steps of any of the above methods when executed by a processor.

[0015] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0016] The embodiment of the present application provides a fuel cell bipolar plate coating detection method based on image recognition, the method comprising: obtaining a bipolar plate image of a fuel cell bipolar plate provided with a flow channel, determining a flow channel region corresponding to the flow channel on the fuel cell bipolar plate in the bipolar plate image, and determining the flow channel center axis in the flow channel region; dividing the flow channel region into two detection regions by the flow channel center axis, determining the flow channel coating uniformity corresponding to the two detection regions respectively, and determining the flow channel coating uniformity difference of the flow channel coating uniformity corresponding to the two detection regions respectively; when the flow channel coating uniformity difference is greater than or equal to the preset flow channel coating uniformity difference, it is determined that the coating uniformity of the fuel cell bipolar plate is unqualified; when the flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, it is determined that the coating uniformity of the fuel cell bipolar plate is qualified. The fuel cell bipolar plate coating detection method based on image recognition in the embodiment of the present application can accurately detect the uniformity of the coating in the flow channel region, avoid the inaccurate coating uniformity detection caused by the uneven reflection and scattering of light in the region where the flow channel is located, and improve the accuracy of the fuel cell bipolar plate coating uniformity detection evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic flow chart of a fuel cell bipolar plate coating detection method based on image recognition provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the working process of the first fuel cell bipolar plate coating detection method based on image recognition provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the cross-sectional structure of a fuel cell bipolar plate provided in an embodiment of the present application;

[0021] Figure 4 A schematic flow chart of a second fuel cell bipolar plate coating detection method based on image recognition provided in an embodiment of the present application;

[0022] Figure 5 A schematic flow chart of a third fuel cell bipolar plate coating detection method based on image recognition provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram of the logical structure of a fuel cell bipolar plate coating uniformity assessment device based on image recognition provided in an embodiment of the present application;

[0024] Figure 7 A schematic diagram of the physical structure of a fuel cell bipolar plate coating uniformity assessment device based on image recognition provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0026] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0028] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0029] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0030] Since the flow channels on the fuel cell bipolar plates are uneven, the area where the flow channels are located will cause uneven reflection and scattering of light, making it difficult to detect the uniformity of the coating on the fuel cell bipolar plates through image recognition.

[0031] Based on the above reasons, an embodiment of the present application provides a fuel cell bipolar plate coating detection method based on image recognition, the method comprising: obtaining a bipolar plate image of a fuel cell bipolar plate provided with a flow channel, determining a flow channel area corresponding to the flow channel on the fuel cell bipolar plate in the bipolar plate image, and determining the flow channel centerline in the flow channel area; dividing the flow channel area into two detection areas through the flow channel centerline, determining the flow channel coating uniformity corresponding to the two detection areas respectively, and determining the flow channel coating uniformity difference of the flow channel coating uniformity corresponding to the two detection areas respectively; when the flow channel coating uniformity difference is greater than or equal to a preset flow channel coating uniformity difference, determining that the coating uniformity of the fuel cell bipolar plate is unqualified; when the flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, determining that the coating uniformity of the fuel cell bipolar plate is qualified. The fuel cell bipolar plate coating detection method based on image recognition in the embodiment of the present application can accurately detect the uniformity of the coating in the flow channel area, avoiding inaccurate coating uniformity detection caused by uneven reflection and scattering of light in the area where the flow channel is located, and improving the accuracy of the fuel cell bipolar plate coating uniformity detection and evaluation.

[0032] In some scenarios, a fuel cell bipolar plate coating detection method based on image recognition in an embodiment of the present application can be applied to the coating uniformity detection of various fuel cell bipolar plates, which can improve the accuracy of the fuel cell bipolar plate coating uniformity detection.

[0033] The following is a detailed description of a fuel cell bipolar plate coating detection method based on image recognition provided in an embodiment of the present application with reference to specific examples.

[0034] Figure 1 A schematic diagram of a fuel cell bipolar plate coating detection method based on image recognition provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the method includes S110 to S130, and S110 to S130 are described in detail below.

[0035] S110, acquiring a bipolar plate image of a fuel cell bipolar plate provided with flow channels, determining a flow channel region corresponding to the flow channel on the fuel cell bipolar plate in the bipolar plate image, and determining a center axis of the flow channel in the flow channel region.

[0036] Figure 2 A schematic diagram of the working process of the first fuel cell bipolar plate coating detection method based on image recognition provided in the embodiment of the present application is shown in FIG. Figure 2As shown, the method in the embodiment of the present application can first illuminate the fuel cell bipolar plate and obtain a bipolar plate image 1 of the fuel cell bipolar plate with a flow channel through a high-precision CCD camera, and then the coating uniformity of the bipolar plate image 1 can be detected.

[0037] When performing coating uniformity detection on the bipolar plate, the flow channel area 11 corresponding to the flow channel on the fuel cell bipolar plate in the bipolar plate image 1 can be determined, and the flow channel center axis 111 can be determined in the flow channel area 11, and then the coating uniformity detection of the flow channel on the fuel cell bipolar plate can be performed based on the flow channel center axis 111.

[0038] Exemplarily, when determining the flow channel region 11 corresponding to the flow channel on the bipolar plate of the fuel cell in the bipolar plate image 1 , the contour of the flow channel region 11 can be identified in the bipolar plate image 1 through image recognition to achieve recognition of the flow channel region 11 .

[0039] For example, when determining the flow channel center axis 111 in the flow channel region 11, the center lines of two contours of the flow channel region 11 can be identified as the flow channel center axis 111. Figure 2 In FIG. 1 , the flow channel center axis 111 is indicated by a dotted line.

[0040] S120, dividing the flow channel area into two detection areas through the flow channel center axis, determining the flow channel coating uniformity corresponding to the two detection areas respectively, and determining the flow channel coating uniformity difference between the flow channel coating uniformity corresponding to the two detection areas respectively.

[0041] When performing coating uniformity detection, the flow channel area 11 can be divided into two detection areas 112 through the flow channel center axis 111. The two detection areas 112 are distributed on both sides of the flow channel center axis 111. Since the two detection areas 112 have different reflection and scattering directions of light, the coating uniformity detection can be performed on the two detection areas 112 separately to avoid coating uniformity errors caused by different reflection and scattering directions of light.

[0042] Figure 3 A schematic diagram of the cross-sectional structure of a fuel cell bipolar plate provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, a flow channel 11a is provided on the bipolar plate 1a, and the flow channel 11a is divided into two flow channel side walls 112a corresponding to two detection areas 112 by the flow channel center axis 111. Since the two flow channel side walls 112a of the flow channel 11a have different characteristics of changes in the reflection and scattering directions of light, performing coating uniformity detection on the flow channel 11a as a whole may result in poor coating uniformity detection effect of the flow channel 11a.

[0043] When the uniformity detection is performed on the flow channel area 11, the uniformity of the flow channel coating corresponding to the two detection areas 112 can be determined. The uniformity of the flow channel coating corresponding to each detection area 112 represents the coating uniformity of the detection area 112, and then the flow channel coating uniformity difference of the flow channel coating uniformity corresponding to the two detection areas 112 can be determined, and then the coating uniformity difference of the two detection areas 112 can be evaluated based on the flow channel coating uniformity difference.

[0044] Exemplarily, when determining the uniformity of the flow channel coating corresponding to each detection area 112, the pixel value of each pixel point of the image corresponding to the detection area 112 can be determined, and the variance value of the pixel values ​​of all pixels of the detection area 112 can be calculated as the uniformity of the flow channel coating corresponding to the detection area 112.

[0045] Exemplarily, when determining the uniformity of the flow channel coating, the average value of all pixel values ​​in the detection area 112 can be calculated first as the reference pixel value of the area, and then the deviation between each pixel value and the reference pixel value can be calculated, and all deviation values ​​can be added and divided by the total number of pixels to obtain the average deviation. The smaller the average deviation, the more uniform the coating; the larger the average deviation, the more uneven the coating.

[0046] S130, when the flow channel coating uniformity difference is greater than or equal to the preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be unqualified. When the flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be qualified.

[0047] When the flow channel coating uniformity is evaluated, when the flow channel coating uniformity difference is greater than or equal to the preset flow channel coating uniformity difference, it means that the difference between the flow channel coating uniformities corresponding to the two detection areas 112 is too large, indicating that the coating uniformity of the flow channel of the bipolar plate on both sides of the central axis is too different, and then it can be determined that the coating uniformity of the fuel cell bipolar plate is unqualified.

[0048] When the flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, it means that the difference between the flow channel coating uniformities corresponding to the two detection areas 112 is small, which means that the coating uniformity of the flow channel of the bipolar plate on both sides of the central axis is small, and then it can be determined that the coating uniformity of the fuel cell bipolar plate is qualified.

[0049] Exemplarily, the preset flow channel coating uniformity difference may be 10 to 20.

[0050] The beneficial effect brought about by the above-mentioned implementation method is that since the two side walls of the flow channel have different changing characteristics of the reflection and scattering direction of light, the coating uniformity detection of the flow channel as a whole may lead to poor coating uniformity detection effect of the flow channel. The method in the embodiment of the present application can determine the flow channel coating uniformity corresponding to the two detection areas respectively, and determine the flow channel coating uniformity difference of the flow channel coating uniformity corresponding to the two detection areas respectively, and judge the coating uniformity according to the flow channel coating uniformity difference, thereby realizing accurate detection of the flow channel coating uniformity.

[0051] The beneficial effect brought about by the above-mentioned implementation method is that the coating uniformity of the bipolar plate is evaluated by the difference in coating uniformity of the flow channel corresponding to the two detection areas in the flow channel, and the coating uniformity of the bipolar plate is evaluated by taking the coating uniformity in the flow channel as the key indicator, thereby improving the detection effect of the coating uniformity of the bipolar plate.

[0052] The beneficial effect brought about by the above-mentioned implementation method is that the coating uniformity at the flow channel has an important influence on the performance of the bipolar plate. By centrally evaluating the coating uniformity at the flow channel, the production quality of the bipolar plate is improved.

[0053] In some implementations, the above method further includes S210 to S220, and S210 to S220 are described in detail below.

[0054] S210, determining multiple straight segment flow channel areas in the flow channel area, dividing each straight segment flow channel area into two straight segment detection areas through the center axis of the flow channel, and determining the straight segment flow channel coating uniformity corresponding to the two straight segment detection areas of each straight segment flow channel area, and determining the straight segment flow channel coating uniformity difference between the straight segment flow channel coating uniformity corresponding to the two straight segment detection areas of each straight segment flow channel area.

[0055] Figure 4 A schematic diagram of a second fuel cell bipolar plate coating detection method based on image recognition provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, when performing coating uniformity evaluation, multiple straight segment flow channel areas in the flow channel area can be determined, and the multiple straight segment flow channel areas can include straight segment flow channel area 1101, straight segment flow channel area 1102, straight segment flow channel area 1103, straight segment flow channel area 1104 and other straight segment flow channel areas, and then the coating uniformity of the bipolar plate can be detected based on the multiple straight segment flow channel areas.

[0056] For example, Figure 4 As shown, when a plurality of straight segment flow channel regions are identified by image recognition, the curved segment flow channel can be segmented in the flow channel region 11 by image recognition to obtain a plurality of straight segment flow channel regions.

[0057] like Figure 4 As shown, for each straight segment flow channel area, each straight segment flow channel area can be divided into two straight segment detection areas by the flow channel center axis. For example, the straight segment flow channel area 1101 can be divided into two straight segment detection areas 1101b by the flow channel center axis 1101a. Since the two straight segment detection areas 1101b have different reflection and scattering conditions for light, the coating uniformity evaluation can be performed on the two straight segment detection areas 1101b respectively.

[0058] During operation, the straight segment flow channel coating uniformity corresponding to the two straight segment detection areas 1101b of each straight segment flow channel area 1101b can be determined respectively. The straight segment flow channel coating uniformity corresponding to each straight segment detection area 1101b is used to evaluate the coating uniformity of each straight segment detection area 1101b, eliminating the influence of different characteristics of reflection and scattering of light in the curved section of the flow channel. The straight segment flow channels have the same light reflection and scattering characteristics, and the reflection and scattering characteristics of light in the straight segment detection area are the same. Therefore, the straight segment flow channel coating uniformity difference of the straight segment flow channel coating uniformity corresponding to the two straight segment detection areas of each straight segment flow channel area can be determined. Then, the coating uniformity of the bipolar plate can be evaluated according to the coating uniformity difference of the two side walls of the straight segment flow channel on both sides of the centerline of the flow channel.

[0059] S220: When at least one straight-line flow channel coating uniformity difference is greater than or equal to a preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be unqualified. When each straight-line flow channel coating uniformity difference is less than a preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be qualified.

[0060] When evaluating the coating uniformity, when the coating uniformity difference of at least one straight segment flow channel is greater than or equal to the preset flow channel coating uniformity difference, it means that the coating uniformity difference of at least one straight segment flow channel on both sides of the flow channel centerline is too large, and then it can be determined that the coating uniformity of the fuel cell bipolar plate is unqualified.

[0061] When the coating uniformity difference of each straight segment flow channel is less than the preset flow channel coating uniformity difference, it means that the coating uniformity difference of both side walls of all straight segment flow channels on both sides of the flow channel centerline is small, and then it can be judged that the coating uniformity of the fuel cell bipolar plate is qualified.

[0062] The beneficial effect brought about by the above implementation method is that the influence of different reflection and scattering characteristics of light in the curved section of the flow channel is eliminated, and the straight section flow channel has the same light reflection and scattering characteristics, thereby improving the accuracy of coating uniformity evaluation.

[0063] The beneficial effect brought about by the above implementation method is that the coating uniformity is evaluated by using the difference in coating uniformity of the straight segment flow channel corresponding to the two straight segment detection areas of the straight segment flow channel, thereby ensuring the accuracy of the coating uniformity evaluation of the bipolar plate.

[0064] The beneficial effect brought about by the above-mentioned implementation method is that the coating uniformity is evaluated by evaluating the coating uniformity difference of the straight segment flow channel corresponding to each straight segment flow channel, thereby ensuring that the local coating uniformity characteristics of the bipolar plate are taken into account when evaluating the coating uniformity of the entire bipolar plate, thereby improving the accuracy of the evaluation of the coating uniformity of the bipolar plate.

[0065] In some implementations, the above method further includes S310 to S320, and S310 to S320 are described in detail below.

[0066] S310, determining the straight segment flow channel coating uniformity of two straight segment detection areas from two different straight segment flow channel areas, and determining the difference between the straight segment flow channel coating uniformity of the two straight segment detection areas from two different straight segment flow channel areas as the straight segment flow channel coating uniformity cross difference; wherein, the two straight segment detection areas from the two different straight segment flow channel areas are located on the same side of the flow channel.

[0067] When evaluating the coating uniformity, the coating uniformity of different straight segment flow channel areas can be compared and tested. Specifically, two straight segment detection areas can be determined. The two straight segment detection areas come from two different straight segment flow channel areas, and the inclination directions of the flow channels corresponding to the two straight segment detection areas are the same.

[0068] like Figure 3 As shown, the two straight segment detection areas correspond to the two flow channels 113a respectively, and the two straight segment detection areas 113 from the two different straight segment flow channel areas are located on the same side of the flow channel, so that the reflection and scattering conditions of the light in the two straight segment detection areas are the same, and then the coating uniformity of the two straight segment detection areas can be evaluated to evaluate the coating uniformity at different flow channels.

[0069] During the evaluation, the straight segment flow channel coating uniformity of two straight segment detection areas from two different straight segment flow channel areas can be determined, and the difference in the straight segment flow channel coating uniformity of two straight segment detection areas from two different straight segment flow channel areas can be determined as the straight segment flow channel coating uniformity cross difference, which represents the difference in coating uniformity from different flow channels with the same light reflection and scattering characteristics.

[0070] For example, Figure 4As shown, the straight segment detection area 1102b from the straight segment flow channel area 1102 and the straight segment detection area 1103b from the straight segment flow channel area 1103 can be determined, and the straight segment flow channel coating uniformity of the straight segment detection area 1102b and the straight segment detection area 1103b can be determined respectively, and then the difference between the straight segment flow channel coating uniformity of the straight segment detection area 1102b from the straight segment flow channel area 1102 and the straight segment detection area 1103b from the straight segment flow channel area 1103 can be determined as the cross difference of the straight segment flow channel coating uniformity.

[0071] S320. When at least one straight line segment flow channel coating uniformity cross difference is greater than or equal to a preset flow channel coating uniformity cross difference, the coating uniformity of the fuel cell bipolar plate is judged to be unqualified; when all flow channel coating uniformity cross differences are less than a preset flow channel coating uniformity cross difference, the coating uniformity of the fuel cell bipolar plate is judged to be qualified.

[0072] When conducting coating uniformity evaluation, when at least one straight segment flow channel coating uniformity cross difference is greater than or equal to the preset flow channel coating uniformity cross difference, it means that the coating uniformity difference of the straight segment detection area with the same light reflection and scattering characteristics from different flow channels is too large, and then it can be determined that the coating uniformity of the fuel cell bipolar plate is unqualified.

[0073] When conducting coating uniformity evaluation, when the cross-difference of coating uniformity of all flow channels is less than the preset cross-difference of coating uniformity of all flow channels, it means that the coating uniformity difference of all straight line segment detection areas with the same light reflection and scattering characteristics from different flow channels is small, and thus the coating uniformity of the fuel cell bipolar plate can be judged to be qualified.

[0074] For example, when calculating the cross-differences of coating uniformity of all flow channels, the cross-differences of coating uniformity of all straight line detection areas from different flow channels may be exhaustively combined to calculate, so as to evaluate the coating uniformity of all different flow channels.

[0075] The beneficial effect brought about by the above-mentioned implementation method is that the coating uniformity difference of the straight line segment detection area with the same light reflection and scattering characteristics from different flow channels is calculated, and the coating uniformity of different flow channels is evaluated, thereby realizing the evaluation of the coating uniformity of different flow channels on the bipolar plate and improving the evaluation effect of the overall coating uniformity of the bipolar plate.

[0076] In some implementations, the above method further includes S410 to S420, and S410 to S420 are described in detail below.

[0077] S410, determining multiple curved section flow channel areas in the flow channel area, dividing each curved section flow channel area into two curved section detection areas through the flow channel centerline, and determining the curved section flow channel coating uniformity corresponding to the two curved section detection areas of each curved section flow channel area, and determining the curved section flow channel coating uniformity difference between the curved section flow channel coating uniformity corresponding to the two curved section detection areas of each curved section flow channel area.

[0078] When performing coating uniformity evaluation, multiple curved section flow channel areas in the flow channel area may be determined, and coating uniformity evaluation may be performed through the curved section flow channel areas.

[0079] like Figure 4 As shown, each curved section flow channel area can be divided into two curved section detection areas through the central axis of the flow channel. The light reflection and scattering characteristics of the two curved section detection areas are different, and then the curved section flow channel coating uniformity corresponding to the two curved section detection areas of each curved section flow channel area can be determined, and then the coating uniformity can be evaluated through the curved section flow channel coating uniformity corresponding to the two curved section detection areas.

[0080] For example, Figure 4 As shown, when multiple curved segment detection areas are identified by image recognition, the straight segment flow channel can be segmented in the flow channel area 11 by image recognition to obtain multiple curved segment flow channel areas.

[0081] like Figure 4 As shown, the curved section flow channel area may include a curved section flow channel area 121, a curved section flow channel area 122, a curved section flow channel area 123, etc., and the curved section flow channel area 121 may include two curved section detection areas 121a.

[0082] When evaluating the coating uniformity, the coating uniformity difference of the curved section flow channel corresponding to the two curved section detection areas of each curved section flow channel area can be determined, and then the coating uniformity of the bipolar plate can be evaluated based on the coating uniformity difference of the curved section flow channel.

[0083] Exemplarily, the uniformity of the curved section flow channel coating corresponding to the two curved section detection areas 121a of each curved section flow channel area 121 can be determined, and the curved section flow channel coating uniformity difference of the curved section flow channel coating uniformity corresponding to the two curved section detection areas 121a can be determined.

[0084] S420: When at least one curved section flow channel coating uniformity difference is greater than or equal to a preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be unqualified. When each curved section flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be qualified.

[0085] When conducting coating uniformity evaluation, when the coating uniformity difference of at least one curved section flow channel is greater than or equal to the preset flow channel coating uniformity difference, it means that the coating uniformity difference of the two curved section detection areas 121a of at least one curved section flow channel is too large, and then it can be determined that the coating uniformity of the fuel cell bipolar plate is unqualified.

[0086] When the coating uniformity difference of each curved section flow channel is less than the preset flow channel coating uniformity difference, it means that the coating uniformity difference of the two curved section detection areas 121a of each curved section flow channel is small, and then it can be determined that the coating uniformity of the fuel cell bipolar plate is qualified.

[0087] The beneficial effect brought about by the above implementation method is that the coating uniformity detection of the curved section of the flow channel can be performed, thereby improving the comprehensiveness of the coating uniformity detection of the flow channel.

[0088] The beneficial effect brought about by the above-mentioned implementation method is that each curved section flow channel area is divided into two curved section detection areas by the central axis of the flow channel. The light reflection and scattering characteristics of the two curved section detection areas are different, thereby realizing the coating uniformity evaluation of the curved section flow channel with different light reflection and scattering characteristics, and avoiding the influence of different light reflection and scattering characteristics on the coating uniformity evaluation.

[0089] In some implementations, the above method further includes S510 to S530, and S510 to S530 are described in detail below.

[0090] S510, dividing each straight segment flow channel area into multiple sub-segment straight segment flow channel areas, and determining the first sub-segment straight segment flow channel area located in the middle of the multiple sub-segment straight segment flow channel areas, and obtaining the first curved segment flow channel area at the end of the straight segment flow channel area where the first sub-segment straight segment flow channel area is located.

[0091] Figure 5 A schematic flow chart of a third fuel cell bipolar plate coating detection method based on image recognition provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, each straight-segment flow channel region can be divided into multiple sub-segment straight-segment flow channel regions, and the coating uniformity evaluation can be performed on each of the multiple sub-segment straight-segment flow channel regions.

[0092] For example, Figure 5As shown, the straight segment flow channel area 11 can be divided into a sub-straight segment flow channel area 131, a sub-straight segment flow channel area 132, a sub-straight segment flow channel area 133, a sub-straight segment flow channel area 134 and a sub-straight segment flow channel area 135 through image recognition.

[0093] like Figure 5 As shown, after determining the multi-segment sub-straight segment flow channel area, the first sub-straight segment flow channel area 133 located in the middle of the straight segment flow channel area in the multi-segment sub-straight segment flow channel area can be determined, and the coating uniformity of the first sub-straight segment flow channel area 133 represents the coating uniformity at the middle flow channel of the bipolar plate.

[0094] At the same time, if Figure 5 As shown, the first curved section flow channel region 136 at the end of the straight section flow channel region where the first sub-straight section flow channel region 133 is located can be obtained, and the coating uniformity on the first curved section flow channel region 136 represents the coating uniformity in the flow channel at the edge of the bipolar plate.

[0095] S520, dividing the first sub-straight segment flow channel area into two first sub-straight segment detection areas by the center axis of the flow channel, dividing the first curved segment flow channel area into two first curved segment detection areas by the center axis of the flow channel, and determining the first sub-straight segment coating uniformity corresponding to the two first sub-straight segment detection areas, and the first curved segment coating uniformity corresponding to the two first curved segment detection areas, and determining the first sub-coating uniformity difference between the coating uniformity of the first sub-straight segment detection area and the coating uniformity of the first curved segment detection area located on the same side of the flow channel.

[0096] When evaluating coating uniformity, Figure 5 As shown, the first sub-straight segment flow channel area 133 can be divided into two first sub-straight segment detection areas 133a through the center axis of the flow channel. The light reflection and scattering characteristics of the two first sub-straight segment detection areas 133a are different, and thus the coating uniformity of the two first sub-straight segment detection areas 133a can be evaluated separately.

[0097] When evaluating the coating uniformity of the two first sub-straight line segment detection areas 133a, the first sub-straight line segment coating uniformity corresponding to the two first sub-straight line segment detection areas 133a can be determined.

[0098] At the same time, the first curved section flow channel area 136 can be divided into two first curved section detection areas 136a through the central axis of the flow channel. The light reflection and scattering characteristics of the two first curved section detection areas 136a are different, and thus the coating uniformity of the two first curved section detection areas 136a can be evaluated separately.

[0099] When evaluating the coating uniformity of the two first curved segment detection areas, the first curved segment coating uniformity corresponding to the two first curved segment detection areas 136a can be determined, and the first sub-coating uniformity difference between the coating uniformity of the first sub-straight segment detection area 133a and the coating uniformity of the first curved segment detection area 136a located on the same side of the flow channel can be determined. The first sub-coating uniformity difference represents the difference in coating uniformity detection values ​​of the straight segment and the curved segment in areas with the same light reflection and scattering characteristics.

[0100] S530: When the first sub-coating uniformity difference is greater than or equal to the preset first sub-coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be unqualified. When all first sub-coating uniformity differences are less than the preset first sub-coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be qualified.

[0101] When conducting a coating uniformity evaluation, when the first sub-coating uniformity difference is greater than or equal to a preset first sub-coating uniformity difference, it indicates that the coating uniformity detection values ​​of the straight segment and the curved segment in the area with the same light reflection and scattering characteristics are relatively different, and thus the coating uniformity of the fuel cell bipolar plate can be judged as unqualified.

[0102] When all first sub-coating uniformity differences are less than the preset first sub-coating uniformity difference, it means that the difference in coating uniformity detection values ​​of the straight segment and the curved segment in the area with the same light reflection and scattering characteristics is small, and thus the coating uniformity of the fuel cell bipolar plate can be judged to be qualified.

[0103] The beneficial effect brought about by the above-mentioned implementation method is that the coating uniformity in the middle flow channel of the bipolar plate and the coating uniformity in the flow channel at the edge of the bipolar plate are calculated separately, and the coating uniformity on the same side of the flow channel is compared, thereby improving the accuracy of evaluating the coating uniformity in the bipolar plate.

[0104] In some implementations, the above method further includes S610 to S620, and S610 to S620 are described in detail below.

[0105] S610, determining the plane area at the four corners of the fuel cell bipolar plate in the bipolar plate image except the flow channel, determining the plane coating uniformity of the plane area, and determining the plane coating uniformity difference between different plane coating uniformities.

[0106] like Figure 5 As shown, the plane area 137 excluding the flow channel at the four corners of the fuel cell bipolar plate in the bipolar plate image 1 can be determined, and the planar coating uniformity of the planar area 137 can be determined, and the planar coating uniformity difference between different planar coating uniformities can be determined to achieve the evaluation of the coating uniformity of different planar areas on the bipolar plate.

[0107] For example, when calculating the planar coating uniformity difference between different planar coating uniformities, the coating uniformity difference of the planar region 137 located at the upper left corner and the lower left corner may be calculated as the planar coating uniformity difference.

[0108] S620. When the plane coating uniformity difference is greater than or equal to the preset plane coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be unqualified; when all plane coating uniformity differences are less than the preset plane coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is determined to be qualified.

[0109] When evaluating the coating uniformity, when the planar coating uniformity difference is greater than or equal to the preset planar coating uniformity difference, it means that the planar coating uniformity difference of different planar areas is too large, and it can be determined that the coating uniformity of the fuel cell bipolar plate is unqualified.

[0110] When all planar coating uniformity differences are less than the preset planar coating uniformity difference, it means that the planar coating uniformity differences in different planar areas are small, and it can be determined that the coating uniformity of the fuel cell bipolar plate is qualified.

[0111] The beneficial effect brought about by the above-mentioned implementation method is that it can evaluate the coating uniformity of the planar areas at different positions of the bipolar plate, realize the evaluation of the coating uniformity of the planar areas of the bipolar plate, and improve the evaluation effect of the coating uniformity of the bipolar plate.

[0112] An embodiment of the present application also provides a fuel cell bipolar plate coating uniformity assessment device based on image recognition, comprising a unit for executing any of the methods described above.

[0113] Figure 6 A schematic diagram of the logical structure of a fuel cell bipolar plate coating uniformity evaluation device based on image recognition is provided in one embodiment of the present application, as shown in FIG. Figure 6 As shown, the device 2 of this embodiment includes a processing unit 21, a storage unit 22 and a transceiver unit 23. The processing unit 21 is used to process data, the storage unit 22 is used to store data, and the transceiver unit 23 is used to send and receive data. The processing unit 21, the storage unit 22 and the transceiver unit 23 cooperate with each other to implement the above method. The beneficial effects brought about by the embodiment of the present application have been described in the above method and will not be repeated here.

[0114] An embodiment of the present application also provides a fuel cell bipolar plate coating uniformity assessment device based on image recognition, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the methods described above when executing the computer program.

[0115] Figure 7 A schematic diagram of the physical structure of a fuel cell bipolar plate coating uniformity evaluation device based on image recognition provided in one embodiment of the present application, such as Figure 7 As shown, the device 3 of this embodiment includes: at least one processor 30 ( Figure 7 Only one processor 30 is shown in the figure), a memory 31, and a computer program 32 stored in the memory 31 and executable on the at least one processor 30. When the processor 30 executes the computer program 32, the steps in any of the above-mentioned method embodiments are implemented. The beneficial effects brought about by the embodiments of the present application have been described in the above-mentioned methods and will not be repeated here.

[0116] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0117] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0118] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0119] An embodiment of the present application provides a computer program product. When the computer program product runs on a mobile terminal, the mobile terminal can implement the steps in the above-mentioned method embodiments when executing the computer program product.

[0120] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can at least include: any entity or device that can carry the computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0121] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0122] 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.

[0123] In the embodiments provided in the present application, it should be understood that the disclosed 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 modules or 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.

[0124] 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.

[0125] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A fuel cell bipolar plate coating detection method based on image recognition, characterized in that: The method comprises: Acquire a bipolar plate image of a fuel cell bipolar plate provided with a flow channel, determine a flow channel region corresponding to the flow channel on the fuel cell bipolar plate in the bipolar plate image, and determine a center axis of the flow channel in the flow channel region; The flow channel area is divided into two detection areas through the flow channel center axis, the flow channel coating uniformity corresponding to the two detection areas is determined, and the flow channel coating uniformity difference between the flow channel coating uniformity corresponding to the two detection areas is determined; When the flow channel coating uniformity difference is greater than or equal to the preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be unqualified; when the flow channel coating uniformity difference is less than the preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be qualified.

2. The method according to claim 1, characterized in that The method further comprises: Determine a plurality of straight-segment flow channel areas in the flow channel area, divide each straight-segment flow channel area into two straight-segment detection areas through the flow channel centerline, and determine the straight-segment flow channel coating uniformity corresponding to the two straight-segment detection areas of each straight-segment flow channel area, and determine the straight-segment flow channel coating uniformity difference between the straight-segment flow channel coating uniformity corresponding to the two straight-segment detection areas of each straight-segment flow channel area; When at least one straight segment flow channel coating uniformity difference is greater than or equal to a preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be unqualified; when each straight segment flow channel coating uniformity difference is less than a preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be qualified.

3. The method according to claim 2, characterized in that The method further comprises: Determine the straight-segment flow channel coating uniformity of two straight-segment detection areas from two different straight-segment flow channel areas, and determine the straight-segment flow channel coating uniformity difference of two straight-segment detection areas from two different straight-segment flow channel areas as the straight-segment flow channel coating uniformity cross difference; wherein the two straight-segment detection areas from two different straight-segment flow channel areas are located on the same side of the flow channel; When at least one straight line segment flow channel coating uniformity cross difference is greater than or equal to the preset flow channel coating uniformity cross difference, the coating uniformity of the fuel cell bipolar plate is judged to be unqualified; when all flow channel coating uniformity cross differences are less than the preset flow channel coating uniformity cross difference, the coating uniformity of the fuel cell bipolar plate is judged to be qualified.

4. The method according to claim 3, characterized in that The method further comprises: Determine a plurality of curved section flow channel areas in the flow channel area, divide each curved section flow channel area into two curved section detection areas through the flow channel centerline, and determine the curved section flow channel coating uniformity corresponding to the two curved section detection areas of each curved section flow channel area, and determine the curved section flow channel coating uniformity difference of the curved section flow channel coating uniformity corresponding to the two curved section detection areas of each curved section flow channel area; When at least one curved section flow channel coating uniformity difference is greater than or equal to a preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be unqualified; when each curved section flow channel coating uniformity difference is less than a preset flow channel coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be qualified.

5. The method according to claim 4, characterized in that The method further comprises: Each straight-segment flow channel region is divided into multiple sub-segment straight-segment flow channel regions, and a first sub-segment straight-segment flow channel region located in the middle of the multiple sub-segment straight-segment flow channel regions is determined, and a first curved-segment flow channel region at the end of the straight-segment flow channel region where the first sub-segment straight-segment flow channel region is located is obtained; Divide the first sub-straight segment flow channel area into two first sub-straight segment detection areas through the flow channel centerline, divide the first curved segment flow channel area into two first curved segment detection areas through the flow channel centerline, and determine the first sub-straight segment coating uniformity corresponding to the two first sub-straight segment detection areas, the first curved segment coating uniformity corresponding to the two first curved segment detection areas, and determine the first sub-coating uniformity difference between the coating uniformity of the first sub-straight segment detection area and the coating uniformity of the first curved segment detection area located on the same side of the flow channel; When the first sub-coating uniformity difference is greater than or equal to the preset first sub-coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be unqualified; when all first sub-coating uniformity differences are less than the preset first sub-coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be qualified.

6. The method according to claim 5, characterized in that The method further comprises: Determine the plane area at the four corners of the fuel cell bipolar plate in the bipolar plate image except the flow channel, determine the plane coating uniformity of the plane area, and determine the plane coating uniformity difference between different plane coating uniformities; When the plane coating uniformity difference is greater than or equal to the preset plane coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be unqualified; when all plane coating uniformity differences are less than the preset plane coating uniformity difference, the coating uniformity of the fuel cell bipolar plate is judged to be qualified.

7. A fuel cell bipolar plate coating uniformity evaluation device based on image recognition, characterized in that: Comprising means for performing the method according to any one of claims 1 to 6.

8. A fuel cell bipolar plate coating uniformity evaluation device based on image recognition, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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