Method and system for detecting fullness of bipolar plate ridges

Abstract

This invention relates to the field of fuel cell component testing technology and provides a method and system for detecting the fullness of bipolar plate ridges. The detection method includes coating the surface of the bipolar plate with ridges, applying a coating material transferable to a substrate; stacking the substrate on the bipolar plate and applying a pressing force to the stacked substrate and bipolar plate according to a preset strategy to form an imprint corresponding to the ridge on the substrate; scanning and photographing the substrate with the imprint, and obtaining the total area of ​​the imprint corresponding to the ridge by image processing and calculation of the obtained image; and calculating the fullness of the ridge using Ω = (S1 / S0) * 100%. This invention provides a new method for detecting the fullness of bipolar plate ridges, which not only helps improve the accuracy of bipolar plate ridge fullness detection but also expands the application range of bipolar plate ridge fullness detection, thus possessing excellent practicality.

Description

Technical Field

[0001] This invention relates to the field of fuel cell component testing technology, and in particular to a method and system for detecting the fullness of the ridge of a bipolar plate. Background Technology

[0002] A proton exchange membrane fuel cell (PEMFC) is an electrochemical energy conversion device based on the reaction of hydrogen and oxygen. It directly converts the chemical energy stored in the fuel into electrical energy through an electrochemical reaction. It is characterized by high efficiency, environmental friendliness and sustainability, and is one of the important development directions in the future new energy field.

[0003] In current proton exchange membrane fuel cells, the bipolar plate, also known as the current collector, is one of the important components of the fuel cell stack. Its main function is to provide a gas flow path, prevent hydrogen and oxygen in the cell chamber from mixing, and establish a current path between the series-connected anode and cathode. Structurally, the bipolar plate needs to be as thin as possible while maintaining a certain mechanical strength and good gas barrier properties to reduce resistance to current and heat conduction.

[0004] Currently, the main materials used to prepare bipolar plates include carbonaceous materials, metallic materials, and composite materials of metal and carbonaceous materials. Carbonaceous materials include graphite and molded carbon materials, while metallic materials include aluminum, nickel, titanium, and stainless steel. Taking bipolar plates made of graphite, especially expanded (flexible) graphite, as an example, to form gas flow channels, staggered ridges and grooves are formed on both the cathode and anode plates of the bipolar plate. The grooves are located between two adjacent ridges and define the gas flow channels, while the ridges can be used for electron transfer.

[0005] Since ridge collapse is unavoidable during the fabrication of graphite bipolar plates, it is necessary to determine the degree of ridge collapse on the bipolar plate in order to evaluate the impact of the degree of ridge collapse on the performance of the fuel cell stack. In order to better characterize the degree of ridge collapse on the bipolar plate, the concept of fullness can also be introduced to evaluate the degree of ridge collapse on the bipolar plate.

[0006] The fullness of the ridge on a bipolar plate is generally defined as the proportion of the full, uncollapsed ridge area to the total area of ​​the ridge on the bipolar plate, and this proportion can be expressed as a percentage. In existing technologies, the conventional method usually uses a laser microscope to scan the surface of the bipolar plate, and calculates the fullness of the ridge based on the three-dimensional information of the bipolar plate surface obtained from the scan.

[0007] However, this traditional method requires manual selection of measurement reference points, which leads to a large error in the fullness results due to human factors. Furthermore, since laser microscopy testing is a static test, it cannot measure the fullness of bipolar plates under stress, which does not match the actual situation where bipolar plates are subjected to stacking forces after being stacked. This also limits the application scope of bipolar plate ridge fullness detection. Summary of the Invention

[0008] In view of this, the present invention aims to provide a method for detecting the fullness of the ridge of a bipolar plate, so as to provide a new way of detecting the fullness of the ridge of a bipolar plate and help to overcome at least one of the shortcomings of the prior art.

[0009] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0010] A method for detecting the fullness of the ridge of a bipolar plate, the method comprising:

[0011] A coating material that can be transferred onto a substrate is applied to the ridged surface of the bipolar plate under test.

[0012] The printing material is stacked on the bipolar plate, and a pressing force is applied to the stacked printing material and the bipolar plate according to a preset strategy to form an imprint on the printing material corresponding to the ridge.

[0013] The printing material on which the imprint is formed is scanned and photographed, and the total area of ​​the imprint corresponding to the ridge is obtained by image processing and calculation of the obtained image.

[0014] The fullness of the ridge is calculated by Ω = (S1 / S0) * 100%;

[0015] Wherein, Ω is the fullness of the ridge, S1 is the total area of ​​the imprint corresponding to the ridge, and S0 is the total area of ​​the region occupied by the ridge on the bipolar plate.

[0016] Furthermore, the coating material uses ink of a specified color.

[0017] Furthermore, the printing material is paper.

[0018] Furthermore, the preset strategy includes:

[0019] The stacked printing substrate and the bipolar plate are placed on a press;

[0020] The press plate applies a preset pressure threshold to the stacked printing substrate and the bipolar plate through the press plate, and holds for a preset time.

[0021] Furthermore, the preset pressure threshold is the stacking force of the fuel cell stack using the bipolar plate.

[0022] Furthermore, the step of scanning and photographing the substrate on which the imprint is formed includes using a metallographic microscope to scan and photograph the substrate on which the imprint is formed; and / or,

[0023] The step of processing and calculating the obtained image to obtain the total area of ​​the imprint corresponding to the ridge includes processing and calculating the obtained image using image software to obtain the total area of ​​the imprint corresponding to the ridge.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The method for detecting the fullness of the ridges of a bipolar plate described in this invention involves coating the surface of the bipolar plate with ridges with a coating material, applying a clamping force to form an imprint corresponding to the ridge on the substrate, photographing the substrate, and calculating the total area of ​​the imprint corresponding to the ridge through image processing. Finally, the fullness of the ridge is calculated using the total area of ​​the imprint corresponding to the ridge and the total area occupied by the ridge on the bipolar plate. This invention provides a novel method for detecting the fullness of the ridges on a bipolar plate. Compared to existing methods using laser microscopes, this method eliminates the need for manual selection of a measurement reference, thus improving the accuracy of ridge fullness detection. Furthermore, since a clamping force is applied to the stacked substrate and bipolar plate during detection, it can simulate the stacking force of the bipolar plate, increasing the application range of ridge fullness detection and overcoming the shortcomings of existing technologies, demonstrating excellent practicality.

[0026] Another objective of this invention is to provide a detection system for the fullness of the ridge of a bipolar plate, which includes a coating material, a printing material, a pressing unit, an imaging unit, an image processing unit, and a calculation unit.

[0027] The coating material is used to coat the ridged surface of the bipolar plate to be tested, and the coated material can be transferred onto the substrate.

[0028] The printing substrate is used to be stacked on the bipolar plate after the coating material is applied;

[0029] The clamping unit is used to apply clamping force to the stacked printing material and the bipolar plate according to a preset strategy, so as to form an imprint on the printing material corresponding to the ridge;

[0030] The imaging unit is used to scan and photograph the printing substrate on which the imprint is formed;

[0031] The image processing unit is used to perform image processing and calculation on the image obtained by the shooting unit to obtain the total area of ​​the imprint corresponding to the ridge;

[0032] The calculation unit is used to calculate the fullness of the ridge by Ω = (S1 / S0) * 100%;

[0033] Wherein, Ω is the fullness of the ridge, S1 is the total area of ​​the imprint corresponding to the ridge, and S0 is the total area of ​​the region occupied by the ridge on the bipolar plate.

[0034] Furthermore, the coating material is an ink of a predetermined color; and / or,

[0035] The printing material is paper; and / or,

[0036] The imaging unit employs a metallurgical microscope; and / or,

[0037] The image processing unit uses image software to perform image processing and calculations on the images obtained by the shooting unit.

[0038] Furthermore, the pressing unit includes a press;

[0039] The press applies a pre-set pressure threshold to the stacked printing substrate and the bipolar plate through its own pressure plate, and holds the pressure for a pre-set time.

[0040] The preset pressure threshold is the stacking force of the fuel cell stack using the bipolar plate.

[0041] The bipolar plate ridge fullness detection system described in this invention has the same beneficial effects as the above-mentioned detection method compared with the prior art, and will not be repeated here. Attached Figure Description

[0042] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0043] Figure 1 This is a schematic diagram of the ridge portion of the bipolar plate according to an embodiment of the present invention;

[0044] Figure 2 This is a flowchart of the detection method described in an embodiment of the present invention;

[0045] Figure 3This is a schematic diagram illustrating the pressing of stacked printing substrate and bipolar plate in an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the detection system described in an embodiment of the present invention;

[0047] Explanation of reference numerals in the attached figures:

[0048] 100. Bipolar plate; 101. Ridge; 102. Groove;

[0049] 10. Coating material; 20. Printing substrate; 30. Pressing unit; 40. Imaging unit; 50. Image processing unit; 60. Calculation unit;

[0050] 300. Press machine; 301. Pressure plate. Detailed Implementation

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0052] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0053] In the description of this invention, it should be noted that the use of terms such as "upper," "lower," "inner," and "outer," indicating orientation or positional relationship, is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the use of terms such as "first" and "second" is also for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] Furthermore, in the description of this invention, unless otherwise explicitly specified, the connecting structures between mating components can be conventional in the art. Moreover, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0055] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] Example 1

[0057] This embodiment relates to a method for detecting the fullness of the ridge of a bipolar plate, which is used to detect the fullness of the ridge 101 on the bipolar plate 100 in order to determine the degree of collapse of the ridge 101 on the bipolar plate 100.

[0058] It is worth noting that the bipolar plate 100 in this embodiment can be, for example, a graphite bipolar plate structure made of graphite, and particularly expanded graphite. Furthermore, the bipolar plate 100 in this embodiment can be an anode plate or a cathode plate, and one exemplary structure is as follows: Figure 1 As shown, alternating ridges 101 and grooves 102 are formed on the bipolar plate 100. The grooves 102 define gas flow channels on the bipolar plate 100, and the ridges 100 serve not only to form the grooves 102 but also to facilitate electron transfer.

[0059] For bipolar plates 100 made of graphite, the collapse of the ridges 101 is unavoidable during the current fabrication process, resulting in holes and defects at the ridge position. To assess the impact of the degree of ridge collapse 101 on the fuel cell stack performance, it is necessary to determine the degree of collapse of the ridges 101 on the bipolar plate 100. This degree of collapse can also be characterized by the fullness of the ridges 101, meaning the degree of collapse of the ridges 101 can be evaluated by the fullness of the ridges 101 on the bipolar plate 100.

[0060] Specifically, the fullness of the ridge 101 on the bipolar plate 100 is defined as the proportion of the full area of ​​the ridge 101, that is, the area of ​​the ridge 101 that has not collapsed, to the total area occupied by the ridge 101 on the bipolar plate 100, and this proportion can generally be expressed as a percentage. In the prior art, the conventional method usually uses a laser microscope to scan the surface of the bipolar plate 100, and calculates the fullness of the ridge 101 based on the three-dimensional information of the surface of the bipolar plate 100 obtained by scanning.

[0061] In the traditional processing method, after obtaining the three-dimensional information of the surface of the bipolar plate 100, the bottom of the groove 102 is generally used as the reference to measure the distance between the bottom of the groove 102 and the top of the ridge 101. When the distance meets the design threshold, it can be regarded as not collapsing, that is, the position is a full area. Otherwise, it is considered to have collapsed, that is, the position is an unfulfilled area.

[0062] The existing method for calculating the fullness of the ridge 101 has several drawbacks. First, it requires manual selection of the measurement reference point, which can easily lead to significant errors in the fullness result due to human factors. Second, since laser microscopy is a static test, it cannot measure the fullness of the bipolar plate 100 under stress. This is inconsistent with the actual situation where the bipolar plate 100 is subjected to the stack loading force after the fuel cell stack is assembled. Consequently, the application scope of the fullness detection of the ridge 101 on the bipolar plate 100 is limited, and it cannot effectively analyze the relationship between the fullness of the ridge 101 on the bipolar plate 100 and the performance of the fuel cell stack.

[0063] The detection method in this embodiment is an innovative design made to overcome the shortcomings of the existing technology, and continues to combine... Figure 2 As shown in the diagram, the detection method in this embodiment also includes the following steps in its overall design.

[0064] Step s1: Apply a coating material 10 that can be transferred onto the substrate 20 to the surface of the bipolar plate 100 to be tested, which has a ridge 101.

[0065] In step s1, specifically, as an exemplary embodiment, the coating material 10 can be, for example, ink of a predetermined color, such as common colors like blue, red, or black. Of course, other colors of ink can also be used besides these. Furthermore, in addition to ink, the coating material 10 in this embodiment can also be any other material capable of being coated on the surface of the bipolar plate 100 and transferred to the printing material 20 to form a corresponding imprint on the printing material 20. This invention does not limit the scope of the application.

[0066] It is understandable that the coating material 10 uses ink, which has advantages such as easy availability, low cost, and effective transfer to the printing substrate 20. In addition, in practice, the ink can generally be applied evenly to the surface of the bipolar plate 100 with the ridge 101 using a brush or similar tool.

[0067] As an exemplary embodiment, the printing material 20 described above in this embodiment can be paper, for example. In this case, using paper as the printing material 20 also has the advantages of being readily available, low cost, and being able to absorb ink coated on the surface of the bipolar plate 100 to form corresponding imprints.

[0068] In practice, the paper can generally be cut to the same size as the bipolar plate 100. Furthermore, the paper can be, for example, ordinary printing paper or Xuan paper. In addition to paper, the printing substrate 20 in this embodiment can also be made of other materials that readily absorb ink; the present invention does not limit this choice.

[0069] Step s2: Stack the printing material 20 on the bipolar plate 100, and apply a pressing force to the stacked printing material 20 and bipolar plate 100 according to a preset strategy to form an imprint on the printing material 20 corresponding to the ridge 101.

[0070] In step s2, specifically, taking ink as the coating material 10 and paper as the printing material 20 as an example, as mentioned above, the paper can be cut to the same size as the bipolar plate 100, and then placed on the side of the bipolar plate 100 with the ridge 101 facing it.

[0071] Furthermore, as an exemplary implementation, combined with Figure 3 As illustrated, the aforementioned preset strategy may include, for example, placing the stacked printing substrate 20 and bipolar plate 100 on a press 300, applying a preset pressure threshold to the stacked printing substrate 20 and bipolar plate 100 through the pressure plate 301 of the press 300, and holding for a preset time.

[0072] Preferably, the aforementioned preset pressure threshold can be, for example, the stacking force of the fuel cell stack using the bipolar plate 100 of this embodiment. This allows the detection method of this embodiment to detect the fullness of the ridge 101 on the bipolar plate 100, i.e., the collapse of the ridge 101, under the stacking force, thereby providing a reference for the selection of the bipolar plate 100 and the design of the stacking force.

[0073] In detail, during compression, the partially collapsed areas, i.e., the unfilled areas, of the upper ridge 101 of the bipolar plate 100 may become filled areas due to the force applied. Therefore, after the press 300 uses the stacking force of the electrode stack to compress the stacked printing substrate 20 and bipolar plate 100, if the fullness test result of the upper ridge 101 of the bipolar plate 100 meets the design requirements, it indicates that the bipolar plate 100 can meet the relevant requirements after stacking and is a qualified product. However, if the fullness test result of the upper ridge 101 of the bipolar plate 100 still does not meet the design requirements after compression by the press 300, it indicates that the bipolar plate 100 is unlikely to meet the relevant requirements even after stacking and is a non-qualified product.

[0074] When the bipolar plate 100 is a defective product, it is necessary to adjust the material used to prepare the bipolar plate 100, that is, the composition ratio of the graphite used, as well as the preparation process of the bipolar plate 100, so that the fullness test of the upper ridge 101 of the adjusted bipolar plate 100 can meet the requirements.

[0075] In this embodiment, the method still relies on applying a compressive force to the stacked substrate 20 and bipolar plate 100 during testing. It's worth noting that, besides determining whether the fullness of the ridge 101 on the bipolar plate 100 meets the requirements under the stack loading force, the testing method of this embodiment can also be used to test under what compressive force the fullness of the ridge 101 on the bipolar plate 100 meets the requirements. This undoubtedly provides a reference for the stack loading force of fuel cell stacks and helps in the design of stack loading force.

[0076] In practical implementation, for the graphite bipolar plate 100, the aforementioned clamping force, that is, the stacking force of the fuel cell using the bipolar plate 100, is usually between 0.1-2 MPa, which can be determined according to the different fuel cell stacks and relevant testing requirements. At the same time, the aforementioned preset time can generally be set to 5-10 seconds, and for example, it can be 5 seconds, 6 seconds, or 8 seconds, etc.

[0077] In addition, it is worth noting that, in order to ensure that the full areas in the ridge 101 can form corresponding imprints on the printing material 20, i.e., on the paper, after the printing material 20 and the bipolar plate 100 are pressed together, while the positions corresponding to the unfulfilled areas will not form imprints, the surface of the pressure plate 301 on the press 300 that contacts the printing material 20 should have a high degree of flatness, so as to avoid affecting the reliability of the imprints formed on the printing material 20.

[0078] Step s3: Scan and photograph the imprinted substrate 20, and obtain the total area of ​​the imprint corresponding to the ridge 101 by image processing and calculation of the obtained image.

[0079] In step s3, as a preferred embodiment, the above-mentioned printing material 20 with the imprint is photographed, for example, by using a metallographic microscope to scan and photograph the printing material 20 with the imprint.

[0080] Metallurgical microscopes organically combine traditional optical microscopes with computers and digital cameras through photoelectric conversion. They allow for microscopic observation not only through the eyepiece but also for viewing real-time dynamic images on a computer screen. Furthermore, they enable image editing and saving. Scanning and photographing the imprint formed on the substrate 20 using a metallurgical microscope effectively reflects the imprint onto the acquired image, ensuring the accuracy of subsequent imprint area calculations.

[0081] In this embodiment, as a preferred implementation, the total area of ​​the imprint corresponding to the ridge 101 is obtained by image processing and calculation of the obtained image. For example, the total area of ​​the imprint corresponding to the ridge 101 can be obtained by image processing and calculation of the obtained image using image software.

[0082] The image software used can be, for example, ImageJ. ImageJ is a Java-based image processing software that can run on multiple platforms and performs various operations such as display, editing, analysis, processing, saving, and printing. It supports multiple image formats. In specific implementation, the image of the substrate 20 obtained by scanning and photographing is processed using the aforementioned image software to obtain the total area of ​​the imprint corresponding to the ridge 101 on the substrate 20. The corresponding operation method of the software can be used, and will not be elaborated here.

[0083] In addition, it should be noted that in specific implementation, in addition to image software such as ImageJ, other software that can perform statistical calculations on the area of ​​different colored regions in the image can also be used in this embodiment. For example, the image analysis software that comes with Zeiss and Leica metallurgical microscopes can also meet the corresponding requirements.

[0084] Step s4: Calculate the fullness of the ridge 101 using Ω = S1 / S0 * 100%.

[0085] In step s4, Ω in the above formula is the fullness of the ridge 101, S1 is the total area of ​​the imprint corresponding to the ridge 101, and S0 is the total area of ​​the area occupied by the ridge 101 on the bipolar plate 100.

[0086] The total area S0 of the area occupied by the ridge 101 on the bipolar plate 100 can generally be directly introduced into the design value of the total area of ​​the ridge 101 on the bipolar plate 100. In other words, the total area of ​​the area occupied by the ridge 101 on the bipolar plate 100 can be determined according to the design parameters of the bipolar plate 100, and then directly substituted into the above formula to calculate the fullness of the ridge 101.

[0087] Besides incorporating design values, another feasible implementation is to perform image processing and calculations on the obtained image in step s3 above to obtain the total area occupied by the ridge 101 on the bipolar plate 100. In this case, when obtaining the total area occupied by the ridge 101 using image processing and calculations, the overall area occupied by the ridge 101 can generally be determined based on the outline of the ridge 101 imprint in the image, and the total area of ​​the ridge 101 can be obtained by statistically analyzing that area.

[0088] In practice, both of the above methods of obtaining the total area S0 can be used, and the first method, which is to directly introduce the design value of the total area of ​​the ridge 101, is usually preferred. This method is more accurate than the area value obtained through image processing and is more conducive to ensuring the effectiveness of the detection.

[0089] The fullness detection method for the upper ridge 101 of the bipolar plate 100 in this embodiment adopts the above design. It not only provides a new way to detect the fullness of the upper ridge 101 of the bipolar plate 100, but also, compared with the existing processing method using a laser microscope, does not require manual selection of the measurement reference, which helps to improve the accuracy of the fullness detection of the upper ridge 101 of the bipolar plate 100. At the same time, since a clamping force equivalent to the stacking force of the fuel cell stack is applied to the stacked substrate 20 and the bipolar plate 100 during the detection, compared with the existing static test using a laser microscope, this embodiment can also simulate the situation of the bipolar plate 100 being subjected to the stacking force of the fuel cell stack. This is beneficial to increase the application range of the fullness detection of the upper ridge 101 of the bipolar plate 100. It can be used to study the influence of the fullness of the ridge 101 on the performance of the fuel cell stack, and to provide a reference for the formulation of the stacking force of the fuel cell stack, thus having good practicality.

[0090] Example 2

[0091] This embodiment relates to a detection system for the fullness of the ridge of a bipolar plate. This detection system is used to implement the detection method in Embodiment 1, and in conjunction with... Figure 4 As shown, the detection system of this embodiment includes a coating material 10, a printing material 20, a pressing unit 30, an imaging unit 40, an image processing unit 50, and a calculation unit 60.

[0092] The coating material 10 is applied to the surface of the bipolar plate 100 to be tested, which has ridges 100, and the applied coating material 10 can be transferred onto the printing material 20. The printing material 20 is stacked on the bipolar plate 100 after the coating material 10 is applied. The clamping unit 30 applies a clamping force to the stacked printing material 20 and bipolar plate 100 according to a preset strategy to form an imprint on the printing material 20 corresponding to the ridges 101.

[0093] The imaging unit 40 is used to scan and photograph the imprinted substrate 20. The image processing unit 50 is used to perform image processing and calculation on the image obtained by the imaging unit 40 to obtain the total area of ​​the imprint corresponding to the ridge 101. The calculation unit 60 is used to calculate the fullness of the ridge 101 using Ω = S1 / S0 * 100%.

[0094] Specifically, referring to the description in Embodiment 1, as a feasible implementation, the coating material 10 can be, for example, ink of a predetermined color, and the ink can be contained in a suitable container. The printing substrate 20 can be, for example, paper, and the imaging unit 40 can be, for example, a metallurgical microscope. The image processing unit 50 can, for example, use image software to perform image processing and calculations on the image obtained by the imaging unit 40, and the image software can be, for example, ImageJ.

[0095] Furthermore, the aforementioned clamping unit 30 specifically includes a press 300, and the aforementioned preset strategy may, for example, involve the press 300 applying a preset pressure threshold clamping force to the stacked printing substrate 20 and bipolar plate 100 via its own pressure plate 301, and maintaining this force for a preset time. Preferably, the aforementioned preset pressure threshold can be the stacking force of the electrode stack using the bipolar plate 100 of this embodiment, and the aforementioned preset time can be between 5 and 10 seconds.

[0096] In this embodiment, it is worth noting that the image processing unit 50 for image processing and calculation can be installed on a corresponding computer. Meanwhile, the calculation unit 60 can also be a calculation module in a computer or other similar device. This calculation module can calculate the fullness of the ridge 101 based on the formula Ω = S1 / S0 * 100% using preset or input parameters.

[0097] As described in Embodiment 1, in the above formula, Ω is the fullness of the ridge 101, S1 is the total area of ​​the imprint corresponding to the ridge 101, and S0 is the total area of ​​the area occupied by the ridge 101 on the bipolar plate 100.

[0098] When using the detection system of this embodiment, the specific detection process can be found in the relevant description in Embodiment 1.

[0099] The detection system of this embodiment, by executing the detection method in Embodiment 1, provides a new way to detect the fullness of the ridge 101 on the bipolar plate 100. Compared with the existing processing method using a laser microscope, it does not require manual selection of the measurement reference, which helps to improve the accuracy of the fullness detection of the ridge 101 on the bipolar plate 100. At the same time, since a clamping force is applied to the stacked substrate 20 and the bipolar plate 100 during detection, it can also simulate the situation of the bipolar plate 100 being subjected to the stacking force of the fuel cell, compared with the existing static test of the laser microscope. This is beneficial to increasing the application range of the fullness detection of the ridge 101 on the bipolar plate 100. It can be used to study the influence of the fullness of the ridge 101 on the fuel cell performance and to provide a reference for the determination of the fuel cell stacking force, thus having good practicality.

[0100] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of detecting ridge fullness of a bipolar plate, characterized by, The detection method includes: A coating material (10) that can be transferred to a printing substrate (20) is applied to the surface of the bipolar plate (100) having a ridge (101); The printing material (20) is stacked on the bipolar plate (100), and a pressing force is applied to the stacked printing material (20) and the bipolar plate (100) according to a preset strategy to form an imprint on the printing material (20) corresponding to the ridge (101). The printing material (20) on which the imprint is formed is scanned and photographed, and the total area of ​​the imprint corresponding to the ridge (101) is obtained by image processing and calculation of the obtained image. The fullness of the ridge (101) is calculated by Ω = (S1 / S0) * 100%. Wherein, Ω is the fullness of the ridge (101), S1 is the total area of ​​the imprint corresponding to the ridge (101), and S0 is the total area of ​​the area occupied by the ridge (101) on the bipolar plate (100).

2. The method for detecting the fullness of the bipolar plate ridge as described in claim 1, characterized in that: The coating material (10) is an ink of a set color.

3. The method for detecting the fullness of the bipolar plate ridge according to claim 2, characterized in that: The printing substrate (20) is paper.

4. The method of detecting bipolar plate ridge fullness according to claim 1, wherein, The preset strategy includes: The stacked printing substrate (20) and bipolar plate (100) are placed on a press (300); The press (301) of the press (300) applies a clamping force of a preset pressure threshold to the stacked printing substrate (20) and the bipolar plate (100) and holds it for a preset time.

5. The method for detecting the fullness of the bipolar plate ridge according to claim 4, characterized in that: The preset pressure threshold is the stacking force of the fuel cell stack using the bipolar plate (100).

6. The method for detecting the fullness of the bipolar plate ridge according to claim 1, characterized in that: The scanning and photographing of the printing material (20) on which the imprint is formed includes scanning and photographing the printing material (20) on which the imprint is formed using a metallographic microscope; and / or, The step of processing and calculating the obtained image to obtain the total area of ​​the imprint corresponding to the ridge (101) includes processing and calculating the obtained image using image software to obtain the total area of ​​the imprint corresponding to the ridge (101).

7. The method for detecting the fullness of the bipolar plate ridge according to any one of claims 1 to 6, characterized in that: The total area of ​​the region occupied by the ridge (101) on the bipolar plate (100) is obtained by image processing and calculation of the obtained image.

8. A system for detecting the fullness of the ridge of a bipolar plate, characterized in that: It includes a coating material (10), a printing material (20), a pressing unit (30), a shooting unit (40), an image processing unit (50), and a computing unit (60); The coating material (10) is used to coat the surface of the bipolar plate (100) to be tested with ridges (100), and the coated material (10) can be transferred onto the substrate (20). The printing substrate (20) is used to be stacked on the bipolar plate (100) after the coating material (10) is applied; The pressing unit (30) is used to apply a pressing force to the stacked printing material (20) and the bipolar plate (100) according to a preset strategy, so as to form an imprint on the printing material (20) corresponding to the ridge (101); The imaging unit (40) is used to scan and photograph the printing substrate (20) on which the imprint is formed; The image processing unit (50) is used to perform image processing and calculation on the image obtained by the shooting unit (40) to obtain the total area of ​​the imprint corresponding to the ridge (101); The calculation unit (60) is used to calculate the fullness of the ridge (101) by Ω = (S1 / S0) * 100%; Wherein, Ω is the fullness of the ridge (101), S1 is the total area of ​​the imprint corresponding to the ridge (101), and S0 is the total area of ​​the area occupied by the ridge (101) on the bipolar plate (100).

9. The bipolar plate ridge fullness detection system according to claim 8, characterized in that: The coating material (10) is an ink of a specified color; and / or, The printing substrate (20) is paper; and / or, The imaging unit (40) employs a metallurgical microscope; and / or, The image processing unit (50) uses image software to perform image processing and calculations on the obtained image.

10. The bipolar plate ridge fullness detection system according to claim 8 or 9, characterized in that: The pressing unit (30) includes a press (300); The press (300) applies a pre-set pressure threshold to the stacked printing substrate (20) and the bipolar plate (100) through its own pressure plate (301) and holds it for a pre-set time; The preset pressure threshold is the stacking force of the electric stack using the bipolar plate (100).

Images