Flow field optimization verification device and method

Abstract

The present invention belongs to the field of fuel cell detection technology, and relates to a flow field optimization verification device and method. By embedding a sensor on a detection plate, assembling the detection plate and the flow field plate together to form a detection composite plate, and arranging the detection composite plate in a fuel cell stack, online detection of the temperature, humidity or pressure at any position inside the fuel cell can be achieved, and the embedded installation method has no effect on the membrane electrode and the reaction gas flow channel. The sensor and the flow channel are respectively arranged in the detection plate and the flow field plate, and the detection plate and the flow field plate are connected in a bonded manner, and the structure is convenient for assembly and disassembly. In this way, the detection plate can be assembled with the flow field plates with different flow channels to form different detection composite plates, so as to realize online detection of bipolar plates with different flow channels, so that the same detection plate can be used to optimize and verify bipolar plates with different flow field designs, which has good practicality, versatility and reliability, low manufacturing cost, can realize multiple uses of one plate, and save the optimization and verification cost of the bipolar plate.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cell detection, and more specifically, relates to a flow field optimization verification device and method. Background Art

[0002] Traditional fossil energy reserves are limited, and the consumption of fossil energy has also brought about a series of environmental problems. Therefore, finding a new clean and efficient way to utilize energy has undoubtedly become a hot topic. A fuel cell is an electrochemical cell whose main principle is to directly convert the chemical energy in the fuel and oxidant into electrical energy through a redox reaction. As an important branch in the field of fuel cells, proton exchange membrane fuel cells (PEMFCs) not only have the general characteristics of fuel cells such as high energy conversion efficiency and environmental friendliness, but also have outstanding advantages such as fast start-up speed at room temperature, small size, no electrolyte loss, easy drainage, long life, high specific power and specific energy. It is not only suitable for the construction of distributed power stations, but also for mobile power supply. It is a new type of military and civilian mobile power source. Therefore, proton exchange membrane fuel cells have a very broad application prospect.

[0003] As one of the core components of fuel cells, the function of the bipolar plate is mainly to provide gas flow channels, disperse the reaction gas, block the hydrogen and oxygen inside the battery, collect current and act as the skeleton of the fuel cell. The design of the bipolar plate flow channel has a significant impact on the concentration distribution, pressure distribution and velocity distribution of the reaction gas inside the fuel cell. A reasonable bipolar plate flow field design should have good reaction gas distribution uniformity, small pressure drop and good drainage capacity, so that the reaction inside the battery is more uniform, the air compressor power of the fuel cell gas supply can be reduced accordingly, and the battery reverse polarity phenomenon caused by flooding can be greatly avoided, thereby slowing down the attenuation of the fuel cell and extending the service life of the battery.

[0004] At present, the optimization design of bipolar plate flow field is mainly evaluated by simulation. With the emergence of refined flow field, simulation has higher and higher requirements on computers, and the simulation time is getting longer and longer. In many cases, due to the excessive number of grids, the solution process often has convergence divergence and solution failure. A small number of people use the test bench to conduct performance tests to evaluate the quality of bipolar plate design during flow field design. Usually, sensors are embedded in bipolar plates with specific design flow fields to detect physical quantities (such as pressure, temperature, humidity, etc.) inside the bipolar plates. This method can only detect one flow field structure at a time. Summary of the invention

[0005] The purpose of the present invention is to provide a flow field optimization verification device to solve the technical problem in the prior art that a sensor is embedded in a bipolar plate to detect physical quantities inside the bipolar plate, resulting in only one flow field structure being detected at a time.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a flow field optimization verification device is provided, comprising a fuel cell stack, a detection composite plate arranged in the fuel cell stack, and a host computer electrically connected to the detection composite plate; the detection composite plate comprises a detection plate with a sensor embedded therein and a flow field plate with a flow channel, and the detection plate can be fitted and connected with a flow field plate with different flow channels; the detection plate comprises a plate body with a central active area, and the central active area is divided into a plurality of partitions distributed in a matrix; a plurality of mounting grooves extending along the width direction of the plate body are provided on one side of the plate body, each of the mounting grooves passes through at least two of the partitions distributed along the width direction of the plate body, and the mounting groove passes through one of the side edges of the plate body; the detection plate also comprises branch circuit boards installed one-to-one in each of the mounting grooves and electrically connected to the host computer, and the number of the branch circuit boards is the same as the number of the mounting grooves; the number of the sensors is the same as the number of the partitions, the sensors are distributed one-to-one in the partitions, and the sensors are arranged on the branch circuit boards on; the plate body is provided with mounting holes at the bottom surface of the mounting groove corresponding to each of the partitions, and the sensor is located in the corresponding mounting hole; the number of the sensors installed on the same branch circuit board is equal to the number of the partitions through which one mounting groove passes, and the sensors installed on the same branch circuit board share a power line and a bottom line; the mounting hole and the mounting groove are filled with insulating members for insulating the sensor; the plate body is provided with first detection holes at the bottom surface of the mounting hole corresponding to each of the partitions, the first detection holes extend to the other side of the plate body, and the first detection holes correspond to the sensing probe of the sensor; one side of the flow field plate is fitted with the other side of the plate body, and the flow channel is provided on the other side of the flow field plate; the flow field plate is provided with second detection holes that pass through the two sides, and the number of the second detection holes is the same as the number of the first detection holes, the sensing probe of the sensor, the first detection holes and the second detection holes are arranged one by one in a corresponding manner, and the flow channel passes through each of the second detection holes.

[0007] Furthermore, the detection board also includes a control circuit board arranged outside the side of the board body; the branch circuit boards close to the same side of the board body are respectively electrically connected to the same control circuit board through header pins, the branch circuit board is provided with a first plug hole, the control circuit board is provided with a second plug hole, and the two ends of the header pin are respectively plugged into the first plug hole and the second plug hole;

[0008] The flow field optimization verification device further comprises a wireless receiving device electrically connected to the host computer; the control circuit board is provided with a power supply, a wireless transmitting device cooperating with the wireless receiving device to wirelessly transmit signals, and a controller for controlling the sensor to transmit signals to the wireless transmitting device and controlling the wireless transmitting device to transmit signals to the wireless receiving device;

[0009] Alternatively, the control circuit board is provided with a power supply, an electrical connector electrically connected to the branch circuit board and electrically connected to a host computer via a data line, and a controller for controlling the sensor to transmit signals to the electrical connector and controlling the electrical connector to transmit signals to the host computer.

[0010] Furthermore, the sensor is one of a temperature sensor, a humidity sensor, a temperature and humidity sensor, a pressure sensor and a gas composition sensor.

[0011] Furthermore, the plate body and the flow field plate are both made of graphite material, and the flatness errors of the other side surface of the plate body and one side surface of the flow field plate are both less than 0.02 mm.

[0012] Furthermore, the board body has two rows of mounting grooves, and two rows of branch circuit boards are installed correspondingly in the two rows of mounting grooves; the number of the control circuit boards is two, and the two control circuit boards are respectively located outside the two side edges of the board body, and one row of the branch circuit boards is electrically connected to the same control circuit board.

[0013] Furthermore, the outer dimensions of the mounting groove are 0.5mm-1mm larger than the outer dimensions of the branch circuit board, and the outer dimensions of the mounting hole are 0.5mm-1mm larger than the outer dimensions of the sensor; the insulating member is an insulating thermosetting resin, and the sensor and the branch circuit board are connected to the board body through insulating thermosetting resin encapsulation; the branch circuit board is a flexible circuit board; the diameters of the first detection hole and the second detection hole are 0.5mm~3mm.

[0014] Furthermore, a first sealing groove is opened on the other side of the plate body, and the first sealing groove extends along the width direction of the plate body and is distributed along the length direction of the plate body. The number of the first sealing grooves is the same as the number of the partitions distributed along the length direction of the plate body. The first sealing groove is arranged around the periphery of each of the first detection holes distributed along the width direction of the plate body. A first sealing ring is installed on the first sealing groove, and the first sealing ring is held between the bottom of the first sealing groove and one side of the flow field plate.

[0015] Furthermore, main flow openings are provided at both ends of the flow field plate, and a groove is provided on one side of the flow field plate for the reaction gas at the main flow opening to enter the flow channel.

[0016] Furthermore, a second sealing groove surrounding each of the main flow channel openings is provided on the other side surface of the flow field plate, and a second sealing ring is provided in the second sealing groove.

[0017] The beneficial effect of the flow field optimization verification device provided by the present invention is that compared with the prior art, the flow field optimization verification device of the present invention has a simple and reliable structure, and the detection composite plate is easy to disassemble and assemble. By embedding the sensor on the detection plate, assembling the detection plate and the flow field plate into a detection composite plate, and arranging the detection composite plate in the fuel cell stack, online detection of the temperature, humidity or pressure at any position inside the fuel cell is achieved, and the embedded installation method has no effect on the membrane electrode and the reaction gas flow channel. Since the resistance of the detection composite plate is very small, the effect on the fuel cell can be ignored, avoiding the effect of the structural changes of the gas diffusion layer and the fuel cell chip reaction area on the electrochemical reaction caused by the external installation. By arranging the sensor and the flow channel in the detection plate and the flow field plate respectively, and the detection plate and the flow field plate are fitted and connected, the structure is easy to assemble and disassemble. In this way, the detection plate can be assembled and matched with the flow field plates with different flow channels to form different detection composite plates, so as to realize online detection of bipolar plates with different flow channels, so that the same detection plate can be used to optimize and verify the bipolar plates with different flow field designs. It has good practicality and versatility, high reliability, low manufacturing cost, can realize multiple uses of one plate, and save the optimization and verification cost of the bipolar plate.

[0018] The present invention also provides a flow field optimization verification method, comprising the following steps:

[0019] S10: Solder the sensor to the branch circuit board to form a sensor module, and detect the conduction between the sensor and the branch circuit board;

[0020] S20: Opening a mounting groove, a mounting hole and a first detection hole on a graphite plate, and the mounting holes and the first detection holes are arranged equidistantly according to the number of partitions to form a plate body;

[0021] S30: installing the sensor module on the board, and fixing the sensor package in the board by insulating thermosetting resin, and then milling one side of the board to form a detection board;

[0022] S40: Check the installed sensor module again to ensure that the sensor module is not damaged during the packaging process;

[0023] S50: Detect the detection board to ensure that the detection board is not leaking;

[0024] S60: processing a flow channel on another graphite plate of the same size, and opening a second detection hole at a position corresponding to the sensing probe of the sensor to form a flow field plate;

[0025] S70: assembling the detection plate and the flow field plate according to the other side of the detection plate and the back flow surface of the flow field plate, and then performing testing and verification;

[0026] S80: The assembled detection composite plate is loaded into the fuel cell stack according to the stacking order of the fuel cell, and the sensor is connected to an external computer to collect data;

[0027] S90: Plot the collected pressure or temperature and humidity data to obtain the distribution of physical quantities in different areas;

[0028] S100: According to the test results, a distribution cloud map or contour line of the test quantity is made to verify the uniformity of the distribution of physical quantities in different flow fields, thereby optimizing the flow field design.

[0029] The beneficial effect of the flow field optimization verification method provided by the present invention is that compared with the prior art, the flow field optimization verification method of the present invention can form a detection composite plate by combining the same detection plate with a flow field plate with different flow channels, thereby realizing the function of one plate with multiple uses and saving the cost of the detection composite plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 An exploded schematic diagram of a flow field optimization verification device provided in Embodiment 1 of the present invention;

[0032] Figure 2 for Figure 1 A partial enlarged view of the mid-flow field optimization verification device;

[0033] Figure 3 for Figure 1 The front view of the test board;

[0034] Figure 4 for Figure 1 A side view of the middle plate;

[0035] Figure 5 for Figure 1 Another side view of the middle plate;

[0036] Figure 6 for Figure 1 A schematic diagram of a side view of the mid-flow field plate;

[0037] Figure 7 for Figure 1 Another side view of the mid-flow field plate;

[0038] Figure 8 for Figure 1 Installation diagram of the middle sensor and branch circuit board;

[0039] Fig. 9 for Figure 1 A schematic diagram of the structure of the first sealing ring;

[0040] Fig.10 This is a front schematic diagram of the detection board provided in the second embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] Embodiment 1:

[0046] Please also read Figures 1 to 9, the flow field optimization verification device provided by the present invention is now described. The flow field optimization verification device includes a fuel cell stack, a detection composite plate 100 arranged in the fuel cell stack, and a host computer electrically connected to the detection composite plate 100; the detection composite plate 100 includes a detection plate 10 with a sensor 120 embedded therein and a flow field plate 20 with a flow channel 210, and the detection plate 10 can be connected to a flow field plate 20 with different flow channels 210; the detection plate 10 includes a plate body 110 with a central active area, and the central active area is divided into a plurality of partitions 111 distributed in a matrix; a side surface of the plate body 110 is provided with a plurality of installation holes extending along the width direction of the plate body 110. The detection board 10 further comprises a plurality of mounting grooves 112, each of which passes through at least two partitions 111 distributed along the width direction of the board body 110, and the mounting groove 112 passes through one of the side edges of the board body 110; the detection board 10 further comprises a branch circuit board 130 which is installed in each mounting groove 112 in a one-to-one correspondence and is electrically connected to the upper computer, and the number of the branch circuit boards 130 is the same as the number of the mounting grooves 112; the number of the sensors 120 is the same as the number of the partitions 111, and the sensors 120 are distributed in the partitions 111 in a one-to-one correspondence, and the sensors 120 are arranged on the branch circuit boards 130; the board body 110 is installed in the The bottom surface of the mounting groove 112 is provided with mounting holes 113 corresponding to each partition 111, and the sensor 120 is located in the corresponding mounting hole 113; the number of sensors 120 installed on the same branch circuit board 130 is equal to the number of partitions 111 passed through one mounting groove 112, and the sensors 120 installed on the same branch circuit board 130 share the power line and the bottom line; the mounting hole 113 is filled with an insulating member for insulating the sensor 120; the bottom surface of the board body 110 located at the mounting hole 113 is provided with first detection holes 114 corresponding to each partition 111, The first detection hole 114 extends to the other side of the plate body 110, and the first detection hole 114 corresponds to the sensing probe of the sensor 120; one side of the flow field plate 20 is arranged in contact with the other side of the plate body 110, and the flow channel 210 is opened on the other side of the flow field plate 20; the flow field plate 20 is provided with second detection holes 220 passing through the two side surfaces, and the number of the second detection holes 220 is the same as the number of the first detection holes 114, the sensing probe of the sensor 120, the first detection hole 114 and the second detection holes 220 are arranged in a one-to-one correspondence, and the flow channel 210 passes through each second detection hole 220.

[0047] The flow field optimization verification device provided by the present invention has a simple and reliable structure, and the detection composite plate 100 is easy to disassemble and assemble. By embedding the sensor 120 on the detection plate 10, the detection plate 10 and the flow field plate 20 are assembled into the detection composite plate 100, and the detection composite plate 100 is arranged in the fuel cell stack, the online detection of the temperature, humidity or pressure at any position inside the fuel cell is realized, and the embedded installation method has no effect on the membrane electrode and the reaction gas flow channel 210. Since the resistance of the detection composite plate 100 is very small, the effect on the fuel cell can be ignored, avoiding the effect of the structural change of the gas diffusion layer and the fuel cell chip reaction area on the electrochemical reaction when it is installed externally. Each branch circuit board 130 is installed with at least two sensors 120, and the sensors 120 share the bottom line and power line, which effectively reduces the wiring area, makes the wiring more streamlined and convenient, and is very convenient to disassemble and replace the sensor 120 that has failed. By arranging the sensor 120 and the flow channel 210 in the detection plate 10 and the flow field plate 20 respectively, and the detection plate 10 and the flow field plate 20 are connected in a fitting manner, the structure is easy to disassemble and assemble. In this way, the detection plate 10 can be assembled with the flow field plate 20 with different flow channels 210 to form different detection composite plates 100, so as to realize the online detection of bipolar plates with different flow channels 210, so that the same detection plate 10 can be used to optimize and verify the bipolar plates with different flow field designs, which has good practicality and versatility, high reliability, low manufacturing cost, and can realize multiple uses of one plate, saving the optimization and verification cost of the bipolar plate. By monitoring the local electrochemical reaction inside the battery, and then adjusting the external input parameters, the adverse reaction of the fuel cell can be avoided, thereby achieving the effect of optimizing performance and improving life. At the same time, through the collected internal data of the fuel cell, complete test data can be provided for the modeler of the fuel cell, and the model of the fuel cell can be improved.

[0048] Furthermore, in this embodiment, the flow field optimization verification device also includes a wireless receiving device electrically connected to the upper computer; the detection board 10 also includes a control circuit board 150 arranged outside the side of the board body 110; the branch circuit boards 130 close to the same side of the board body 110 are respectively electrically connected to the same control circuit board 150 through the pin header, the branch circuit board 130 is provided with a first plug hole 131, the control circuit board 150 is provided with a second plug hole, and the two ends of the pin header are respectively plugged into the first plug hole 131 and the second plug hole; the control circuit board 150 is provided with a power supply 151, a wireless transmitting device 152 that cooperates with the wireless receiving device to wirelessly transmit signals, and a controller for controlling the sensor 120 to transmit signals to the wireless transmitting device 152 and controlling the wireless transmitting device 152 to transmit signals to the wireless receiving device. The use of wireless transmission effectively reduces the cumbersome wiring, is very convenient for the assembly of the detection composite board 100, and effectively avoids the phenomenon of wrong connection and circuit breaking.

[0049] The plate body 110 and the flow field plate 20 are both made of graphite material. Specifically, the plate body 110 and the flow field plate 20 are both graphite plates, which are easy to form flow channels 210, mounting grooves 112 and mounting holes 113, and have good electrical conductivity. The flow channel 210 is used for hydrogen transmission of the anode plate or oxygen transmission of the cathode plate. The structure of the flow channel 210 is completely consistent with the standard single cell flow field actually used in the fuel cell stack. In addition, the other side of the plate body 110 and one side of the flow field plate 20 are precision machined, and the flatness error is less than 0.02mm, ensuring a good fit and connection between the plate body 110 and the flow field plate 20 to prevent air leakage.

[0050] The central active area of ​​the plate 110 is 186 cm 2 , divided into 4*9 partitions 111, the number and shape of the partitions 111 can be determined by the size of the active area and the measurement requirements. The gas pressure distribution is measured using in-situ, non-destructive technology. The battery stack partition 111 can be subjected to in-situ electrochemical testing, and the local physical and chemical state can be analyzed by impedance spectroscopy analysis technology, and the multi-physical quantity measurement data can be verified against each other. At the same time, the material composition and microstructure changes in the corresponding area after the battery stack test are examined, so as to obtain an in-depth, comprehensive and intuitive understanding of the heterogeneity and attenuation law of the battery stack. The potential distribution of the electrode plane can be obtained at the same time. Physical quantity measurements are performed on one or more single cells in the battery stack to obtain a three-dimensional distribution map. It can be understood that according to actual measurement needs, the distribution of the above-mentioned partitions 111 can also be other matrix methods, which are not limited here.

[0051] In this example, see Figure 4 The board body 110 has two rows of mounting grooves 112, and two rows of branch circuit boards 130 are installed corresponding to the two rows of mounting grooves 112; the number of control circuit boards 150 is two, and the two control circuit boards 150 are respectively located outside the two opposite sides of the board body 110, and a row of branch circuit boards 130 is electrically connected to the same control circuit board 150. The control circuit board 150 acts as a reinforcing rib on both sides of the board body 110, which can not only enhance the mechanical strength of the board body 110, but also facilitate data transmission to the sensor 120.

[0052] In this embodiment, the length direction of the branch circuit board 130 is perpendicular to the length direction of the control circuit board 150. This structure facilitates the installation of the branch circuit board 130 on the control circuit board 150, has a compact structure, and occupies little space.

[0053] The branch circuit board 130 is a printed circuit board, and may be a flexible printed circuit board or a non-flexible printed circuit board. The flexible printed circuit board occupies a small volume and has a flexible structure, so it is easy to be embedded in the board body 110 .

[0054] The sensor 120 is one of a temperature sensor, a humidity sensor, a pressure sensor and a gas sensor, that is, any one of the temperature sensor, the humidity sensor, the temperature and humidity sensor, the pressure sensor and the gas sensor can be embedded in the board 110 according to the detection needs for online detection. The temperature sensor, the humidity sensor, the temperature and humidity sensor and the pressure sensor are respectively used to detect the temperature, humidity, temperature and humidity and pressure in the battery stack, while the gas sensor is used to detect the concentration of gases such as H2, O2, CO or CO2.

[0055] The outer dimensions of the mounting groove 112 are 0.5mm-1mm larger than those of the branch circuit board 130, and the outer dimensions of the mounting hole 113 are 0.5mm-1mm larger than those of the sensor 120; a gap is reserved therein for filling with insulating members to ensure that the sensor 120 and the branch circuit board 130 are firmly mounted on the board body 110, and that the sensors 120 are insulated from each other and have complementary interference.

[0056] The insulating member is an insulating thermosetting resin, and the sensor 120 and the branch circuit board 130 are connected to the board body 110 through the insulating thermosetting resin package. In addition, after the board body 110 is filled with the insulating thermosetting resin, it needs to be clamped and dried by a fixture to solidify the insulating thermosetting resin. After the insulating thermosetting resin is solidified, the side of the board body 110 filled with the insulating thermosetting resin is milled to obtain a working surface, and the precision milling operation ensures that its flatness is less than 0.01mm.

[0057] The mounting groove 112 , the mounting hole 113 and the first detection hole 114 are connected in sequence from one side of the plate body 110 to the other side. The sensing probe of the sensor 120 is installed close to the other side of the plate body 110 , and the temperature, humidity and pressure of the reaction gas in the flow channel 210 can be measured in situ.

[0058] Preferably, in this embodiment, the diameter of the first detection hole 114 and the second detection hole 220 is 3 mm. The first detection hole 114 and the second detection hole 220 are both arranged opposite to the sensing probe of the sensor 120 and are slightly larger than the diameter of the sensing probe of the sensor 120 to ensure that the sensing probe of the sensor 120 can accurately detect the temperature, humidity, pressure and gas distribution of the gas in the flow channel 210. It can be understood that in other embodiments of the present invention, according to the actual size of the sensing probe of the sensor 120, the diameter of the first detection hole 114 and the second detection hole 220 can also be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, etc., as long as they are within the range of 0.5 mm to 3 mm, and are not limited here.

[0059] In this example, see Figure 4A first sealing groove 115 is provided on the other side of the plate body 110. The first sealing groove 115 extends along the width direction of the plate body 110 and is distributed along the length direction of the plate body 110. The number of the first sealing grooves 115 is the same as the number of the partitions 111 distributed along the length direction of the plate body 110. The first sealing groove 115 is arranged around the periphery of each first detection hole 114 distributed along the width direction of the plate body 110. A first sealing ring 140 is installed on the first sealing groove 115. The first sealing ring 140 is held between the bottom of the density groove and one side of the flow field plate 20. The first sealing ring 140 is used to seal the sensors 120, prevent the reaction gas in the flow field plate 20 from leaking, and avoid mutual interference between the sensors 120.

[0060] See also Figure 6 and Figure 7 , main flow openings 250 are also provided at both ends of the flow field plate 20, and a groove 230 is provided on one side of the flow field plate 20 for the reaction gas of the main flow openings 250 to enter the flow channel 210. A second sealing groove 240 is provided on the other side of the flow field plate 20 to surround each main flow opening 250, and a second sealing ring (not shown in the figure) is provided in the second sealing groove 240 to prevent the gas of different main flow openings 250 from being mixed with each other through the second density ring.

[0061] Before installing the sensor 120, spray three-proof paint (high temperature resistant, waterproof, and insulated) on the exposed pins to protect the pins. The layout of the sensor 120 adopts an IIC bus structure. The sensor 120 is embedded with other digital signal sensors 120 similar to the IIC signal. Two or more sensors 120 are installed in a group on a branch circuit board 130, and the power line and ground line can be shared to reduce the wiring area. And the signal line of the sensor 120 is arranged in the middle of the ground line to prevent the signal of the sensor 120 from being interfered by the outside world. The end of the branch circuit board 130 is connected to the control circuit board 150 through a pin header, which has a compact structure and is easy to assemble and disassemble. It is very convenient to disassemble and replace the failed or malfunctioning sensor 120.

[0062] The controller is a single chip microcomputer or other controller, which can control the sensor 120, the wireless transmitter and other related devices. When performing detection, the controller controls the wireless transmitter to send data to the sensor 120, and the data transmission frequency of the sensor 120 is not less than 100HZ. The wireless transmission can adopt rigbee or PTR2000 or other low-energy, safe and reliable wireless transmission devices, which belong to the existing technology.

[0063] When testing the fuel cell, the controller controls the sensor 120 to transmit the signal to the wireless transmitter, and controls the wireless transmitter to transmit the digital signal to the wireless receiver. The wireless receiver transmits the received data to the host computer through the serial port for processing and display. The host computer uses labview for interface design and uses event trigger structure to view the historical data of the sensor 120. Figure 7 Fitting cloud diagram of temperature detection results, Figure 8 Humidity detection results fitting cloud chart.

[0064] In this embodiment, a charging device for charging the power supply is provided on the control circuit board 150, which facilitates charging of the power supply of the control circuit board 150; or, a power supply interface for powering the control circuit board 150 and the sensor 120 through a DC source is provided on the control circuit board 150.

[0065] The present invention also provides a flow field optimization verification method, comprising the following steps:

[0066] S10: Solder the sensor 120 to the branch circuit board 130 to form a sensor module, and detect the conduction between the sensor 120 and the branch circuit board 130;

[0067] S20: Opening a mounting groove 112, a mounting hole 113 and a first detection hole 114 on a graphite plate, and the mounting hole 113 and the first detection hole 114 are arranged equidistantly according to the number of partitions to form a plate body 110;

[0068] S30: installing the sensor module on the board 110, and fixing the sensor package in the board 110 by insulating thermosetting resin, and then milling one side of the board 110 to form the detection board 10;

[0069] S40: Check the installed sensor module again to ensure that the sensor module is not damaged during the packaging process;

[0070] S50: Perform a sealing test on the detection board 10 to ensure that the detection board 10 is leak-proof;

[0071] S60: processing a flow channel on another graphite plate of the same size, and opening a second detection hole 220 at a position corresponding to the sensing probe of the sensor 120 to form a flow field plate 20;

[0072] S70: assembling the detection plate 10 and the flow field plate 20 in accordance with the other side of the detection plate 10 and the back flow field surface of the flow field plate 20, and then performing a test verification;

[0073] S80: The assembled detection composite plate 100 is loaded into the fuel cell stack according to the stacking order of the fuel cell, and the sensor 120 is connected to an external computer to collect data;

[0074] S90: Plot the collected pressure or temperature and humidity data to obtain the distribution of physical quantities in different areas;

[0075] S100: According to the test results, a distribution cloud map or contour line of the test quantity is made to verify the uniformity of the distribution of physical quantities in different flow fields, thereby optimizing the flow field design.

[0076] The flow field optimization verification method of the present invention can form a detection composite plate 100 by combining the same detection plate with a flow field plate having different flow channels, thereby realizing the multi-purpose function of one plate and saving the cost of the detection composite plate.

[0077] Embodiment 2:

[0078] The technical features of the flow field optimization verification device in this embodiment are basically the same as those of the flow field optimization verification device in Example 1, the difference being that: in this embodiment, refer to Fig.10 , the flow field plate sends the detection result of the sensor 120a to the host computer by means of data line connection. Specifically, the control circuit board 150a is provided with a power supply 151a, an electrical connector 153 electrically connected to the branch circuit board 130a and electrically connected to the host computer through a data line, and a controller for controlling the sensor 120a to transmit a signal to the electrical connector 153 and controlling the electrical connector 153 to transmit a signal to the host computer. During actual verification, the electrical connector 153 needs to be electrically connected to the host computer through a data line first, and the detection result of the sensor 120a is first transmitted to the branch circuit board 130a, and then transmitted from the branch circuit board 130a to the control circuit board 150a, and finally transmitted to the host computer through the electrical connector 153.

[0079] Preferably, in this embodiment, the electrical connector 153 is a first row of pins, and correspondingly, the data line has a second row of pins, and the first row of pins and the second row of pins form a plug-in fit to achieve electrical connection between the control circuit board 150a and the host computer. It can be understood that in other embodiments of the present invention, the electrical connector 153 can also be other structures, such as a USB socket, which is not limited here.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flow field optimization verification device, characterized in that: It includes a fuel cell stack, a detection composite plate arranged in the fuel cell stack, and a host computer electrically connected to the detection composite plate; the detection composite plate includes a detection plate with a sensor embedded therein and a flow field plate with a flow channel, and the detection plate can be connected to the flow field plate with different flow channels; the detection plate includes a plate body with a central active area, and the central active area is divided into a plurality of partitions distributed in a matrix; a side surface of the plate body is provided with a plurality of installation grooves extending along the width direction of the plate body, each of the installation grooves passes through at least two of the partitions distributed along the width direction of the plate body, and the installation groove passes through one of the side edges of the plate body; the detection plate also includes branch circuit boards installed one-to-one in each of the installation grooves and electrically connected to the host computer, and the number of the branch circuit boards is the same as the number of the installation grooves; the number of the sensors is the same as the number of the partitions, the sensors are distributed one-to-one in the partitions, and the sensors are arranged on the branch circuit boards; the plate body corresponds to the bottom surface of the installation groove A mounting hole is respectively opened at each of the partitions, and the sensor is located in the corresponding mounting hole; the number of the sensors installed on the same branch circuit board is equal to the number of the partitions passed by one mounting slot, and the sensors installed on the same branch circuit board share a power line and a bottom line; the mounting hole and the mounting slot are filled with insulating members for insulating the sensor; the bottom surface of the plate body located at the mounting hole is respectively opened with a first detection hole corresponding to each of the partitions, the first detection hole extends to the other side of the plate body, and the first detection hole corresponds to the sensing probe of the sensor; one side of the flow field plate is arranged in contact with the other side of the plate body, and the flow channel is opened on the other side of the flow field plate; the flow field plate is opened with second detection holes that pass through the two sides, and the number of the second detection holes is the same as the number of the first detection holes, the sensing probe of the sensor, the first detection hole and the second detection hole are arranged in a one-to-one correspondence, and the flow channel passes through each of the second detection holes; The sensor is one of a temperature sensor, a humidity sensor, a pressure sensor and a gas composition sensor; The plate body and the flow field plate are both made of graphite material.

2. The flow field optimization verification device according to claim 1, characterized in that: The sensor is a temperature and humidity sensor.

3. The flow field optimization verification device according to claim 1, characterized in that: The detection board also includes a control circuit board arranged outside the side of the board body; the branch circuit boards close to the same side of the board body are electrically connected to the same control circuit board through pin headers, the branch circuit board is provided with a first plug hole, the control circuit board is provided with a second plug hole, and the two ends of the pin header are respectively plugged into the first plug hole and the second plug hole; The flow field optimization verification device further comprises a wireless receiving device electrically connected to the host computer; the control circuit board is provided with a power supply, a wireless transmitting device cooperating with the wireless receiving device to wirelessly transmit signals, and a controller for controlling the sensor to transmit signals to the wireless transmitting device and controlling the wireless transmitting device to transmit signals to the wireless receiving device; Alternatively, the control circuit board is provided with a power supply, an electrical connector electrically connected to the branch circuit board and electrically connected to a host computer via a data line, and a controller for controlling the sensor to transmit signals to the electrical connector and controlling the electrical connector to transmit signals to the host computer.

4. The flow field optimization verification device according to claim 1, characterized in that: The flatness errors of the other side surface of the plate body and one side surface of the flow field plate are both less than 0.02 mm.

5. The flow field optimization verification device according to claim 3, characterized in that: The board body has two rows of mounting grooves, and two rows of branch circuit boards are installed correspondingly in the two rows of mounting grooves; the number of the control circuit boards is two, and the two control circuit boards are respectively located outside the two side edges of the board body, and one row of the branch circuit boards is electrically connected to the same control circuit board.

6. The flow field optimization verification device according to claim 5, characterized in that: The outer dimensions of the mounting groove are 0.5mm-1mm larger than those of the branch circuit board, and the outer dimensions of the mounting hole are 0.5mm-1mm larger than those of the sensor; the insulating member is an insulating thermosetting resin, and the sensor and the branch circuit board are connected to the board body through insulating thermosetting resin encapsulation; the branch circuit board is a flexible circuit board; the diameters of the first detection hole and the second detection hole are 0.5mm~3mm.

7. The flow field optimization verification device according to claim 1, characterized in that: A first sealing groove is provided on the other side of the plate body, and the first sealing groove extends along the width direction of the plate body and is distributed along the length direction of the plate body. The number of the first sealing grooves is the same as the number of the partitions distributed along the length direction of the plate body. The first sealing groove is arranged around the periphery of each of the first detection holes distributed along the width direction of the plate body. A first sealing ring is installed on the first sealing groove, and the first sealing ring is held between the bottom of the first sealing groove and one side of the flow field plate.

8. The flow field optimization verification device according to claim 1, characterized in that: Main flow openings are also formed at both ends of the flow field plate, and a groove is formed on one side of the flow field plate for the reaction gas at the main flow opening to enter the flow channel.

9. The flow field optimization verification device according to claim 8, characterized in that: A second sealing groove surrounding each of the main flow channel openings is arranged on the other side of the flow field plate, and a second sealing ring is arranged in the second sealing groove.

10. A flow field optimization verification method, characterized in that: Using the flow field optimization verification device according to any one of claims 1 to 9, the flow field optimization verification method comprises the following steps: S10: Soldering the sensor to the branch circuit board to form a sensor module, and detecting the conduction between the sensor and the branch circuit board; S20: Opening a mounting groove, a mounting hole and a first detection hole on a graphite plate, and the mounting holes and the first detection holes are arranged equidistantly according to the number of partitions to form a plate body; S30: installing the sensor module on the board, and fixing the sensor package in the board by insulating thermosetting resin, and then milling one side of the board to form a detection board; S40: Check the installed sensor module again to ensure that the sensor module is not damaged during the packaging process; S50: Perform a sealing test on the test board to ensure that the test board is leak-proof; S60: processing a flow channel on another graphite plate of the same size, and opening a second detection hole at a position corresponding to the sensing probe of the sensor to form a flow field plate; S70: assembling the detection plate and the flow field plate according to the other side of the detection plate and the back flow surface of the flow field plate, and then performing testing and verification; S80: The assembled detection composite plate is loaded into the fuel cell stack according to the stacking order of the fuel cell, and the sensor is connected to an external computer to collect data; S90: Plot the collected pressure or temperature and humidity data to obtain the distribution of physical quantities in different areas; S100: According to the test results, a distribution cloud map or contour line of the test quantity is made to verify the uniformity of the distribution of physical quantities in different flow fields, thereby optimizing the flow field design.

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