Fuel cell internal printed resistance type on-line current and temperature distribution detecting device

Abstract

The present application relates to fuel cell technology field, especially to fuel cell internal printed resistance type online current and temperature distribution detection device, including sampling plate for signal acquisition and controller for signal amplification and data post-processing;Fuel cell stack is composed of several bipolar plates and membrane electrode stacks, the sampling plate is arranged between the adjacent membrane electrode, and the bipolar plate is arranged on both sides of the sampling plate;The controller is located at both ends of the sampling plate and is arranged outside the stack;The sampling plate is composed of several acquisition units, the acquisition unit includes first copper sheet, second copper sheet and signal acquisition circuit board;The signal acquisition circuit board is arranged between the first copper sheet and the second copper sheet;The signal acquisition circuit board is a current acquisition circuit board, or a current acquisition circuit board and a temperature acquisition circuit board, or a current and temperature integrated acquisition circuit board.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to an internal printed resistive online current and temperature distribution detection device for fuel cells. Background Technology

[0002] As an energy conversion device, fuel cells can directly convert the chemical energy of fuel into electrical energy. They have advantages such as high energy density, high efficiency, and environmental friendliness, and have received widespread attention in recent years. The core components of a fuel cell are the membrane electrode assembly (MEA) and bipolar plates. The design and material properties of the MEA and bipolar plates directly determine the performance and durability of the fuel cell.

[0003] The current distribution within a fuel cell determines its output performance and durability. The local reactant concentration distribution, heat distribution, assembly pressure distribution, and water distribution directly influence the current distribution. Besides common inspection methods such as Cell Voltage Monitor (CVM) and overall monitoring of inlet and outlet gas pressure and temperature, characterizing the local current distribution within individual cell surfaces is crucial for troubleshooting and designing fuel cells under operating conditions. Current-temperature distribution analyzers can effectively test the current and temperature distribution within a fuel cell and can be used for membrane electrode assembly (MEA) problem diagnosis and gas distribution effectiveness verification in bipolar plate flow field design.

[0004] In Chinese patent CN 113075444 A, Yin Cong et al. invented an online current distribution detection device for fuel cells, including a double-sided partitioned acquisition board and a host computer. The middle area of ​​the double-sided partitioned acquisition board, corresponding to the active area of ​​the fuel cell stack, is the double-sided partitioned acquisition area. The double-sided partitioned acquisition board is a multi-layer printed circuit board with five layers, including a top copper-plated gold partition, a top signal trace layer, a middle resistor trace layer, a bottom signal trace layer, and a bottom copper-plated gold partition, arranged from top to bottom. The middle resistor trace layer uses embedded resistors to provide traced sampling resistors. By controlling the length and cross-sectional area of ​​the resistor material traces, the resistance values ​​of the traced sampling resistors in each acquisition unit are made equal, thereby ensuring the accuracy of the measured current. However, the method of embedding resistance wires is technically difficult, and the deviation of each resistance value is still relatively large, requiring a large number of calibration tests. At the same time, the influence of temperature on the resistance value during the test cannot be eliminated.

[0005] In Chinese patent CN 112229537 B, Cao Jishen et al. invented a zoned testing system for detecting the current and temperature distribution of a fuel cell. The system includes a data acquisition board, a signal amplification module, a data acquisition module, a data processing module, and a data display module. The data acquisition board is a multi-layered printed circuit board with an array of copper-plated gold zones on its upper surface. Each copper-plated gold zone is a concave sheet structure attached to the upper surface of the printed circuit board. Each copper-plated gold zone has a corresponding equal-impedance wiring within its interlayer. The output terminals of all equal-impedance wirings are connected to a sampling resistor on the external part of the fuel cell stack on the printed circuit board. The current is measured by measuring the voltage across the external sampling resistor. However, the external sampling resistor increases the size of the device. Furthermore, the current needs to flow through the printed circuit board to reach the external resistor, which limits the upper limit of the measured current. If the current is too large, the cross-sectional area of ​​the internal equal-impedance wiring needs to be increased, which in turn affects the thickness of the sampling board, leading to excessive current measurement errors.

[0006] In summary, the existing technology has the following disadvantages:

[0007] (1) The embedded resistor method has a complex manufacturing process. It is difficult to ensure that the impedance of each acquisition unit is consistent and a lot of calibration work is required.

[0008] (2) The external resistor method results in a larger size of the external device. At the same time, since the current needs to flow through the wiring inside the circuit board through the external resistor, when the measured current is too large, the cross-section of the wiring needs to be increased to ensure safety, which affects the wiring of the sampling board and thus affects the thickness of the sampling board, leading to an increase in measurement error.

[0009] (3) The gold-plated copper sheets are glued to the sampling plate one by one. The process is complicated and it is difficult to ensure the flatness of the sampling plate, which affects the measurement accuracy. Summary of the Invention

[0010] To address the issues of complex manufacturing processes and poor measurement accuracy in existing current sampling boards, including flatness problems caused by copper sheet bonding in copper-plated and gold-plated partitions, resistance consistency problems caused by embedded resistors, and problems with a small measurement current range caused by external resistors, this invention provides an in-line current and temperature distribution detection device with internal printed resistors for fuel cells. In other words, it is an improved design of a current and temperature distribution sampling board with built-in printed resistors. Compared with existing sampling boards, it has a simpler manufacturing process, higher detection accuracy, and a larger detection current range.

[0011] This invention discloses an in-line current and temperature distribution detection device for a fuel cell using printed resistors, comprising a sampling board for signal acquisition and a controller for signal processing. The sampling board consists of two symmetrically matrixed acquisition units, each including an upper gold-plated copper sheet, a signal acquisition circuit board, and a lower gold-plated copper sheet. Acquisition resistors for current and temperature signal acquisition and signal output wiring are all arranged within the signal acquisition circuit board via printed circuits. The upper and lower gold-plated copper sheets are mounted on the upper and lower sides of the multilayer circuit board using a method of etching and partitioning onto a single gold-plated copper sheet. The controller processes the voltage across the acquisition resistors on the multilayer circuit board to obtain the current and temperature distribution.

[0012] The objective of this invention can be achieved through the following technical solutions:

[0013] This invention provides an in-line current and temperature distribution detection device for a fuel cell with printed resistance, including a sampling board for signal acquisition and a controller for signal amplification and data post-processing;

[0014] The fuel cell stack consists of several bipolar plates and membrane electrode assemblies stacked together. The sampling plate is located between adjacent membrane electrode assemblies, and bipolar plates are arranged on both sides of the sampling plate.

[0015] The controller is located at both ends of the sampling plate and is disposed outside the fuel cell stack;

[0016] The sampling board is composed of several acquisition units, each acquisition unit comprising a first copper sheet, a second copper sheet, and a signal acquisition circuit board; the signal acquisition circuit board is disposed between the first copper sheet and the second copper sheet.

[0017] The signal acquisition circuit board is a current acquisition circuit board, or a current acquisition circuit board and a temperature acquisition circuit board, or a current and temperature acquisition circuit board integrated into one circuit board.

[0018] The current acquisition circuit board is used to acquire current signals, the temperature acquisition circuit board is used to acquire temperature signals, and the integrated current and temperature acquisition circuit board is used to acquire both current and temperature signals.

[0019] In one embodiment of the present invention, the acquisition units are arranged in an array;

[0020] The surfaces of the first and second copper sheets away from the signal acquisition circuit board are plated with gold.

[0021] A PCB insulating layer is provided between the signal acquisition circuit board and the first and second copper sheets.

[0022] In one embodiment of the present invention, the acquisition units are of equal area and adjacent acquisition units are electrically isolated from each other.

[0023] In one embodiment of the present invention, the upper and lower surfaces of the acquisition unit are gold-plated copper sheets. The manufacturing process is as follows: first, a flat copper sheet is pasted onto the upper and lower surfaces of the signal acquisition circuit board; then, after dividing the acquisition array, gold plating is performed; finally, the copper between each acquisition unit is etched away by etching method, thereby achieving mutual electrical isolation.

[0024] In one embodiment of the present invention, the current acquisition circuit board includes a first circuit board, a current acquisition resistor, and current acquisition wiring;

[0025] The current acquisition resistor is mounted on the first circuit board by circuit printing. The two ends of the current acquisition resistor are a first signal terminal and a second signal terminal, respectively. The first signal terminal and the second signal terminal are connected to the current acquisition wiring, which is connected to the controller.

[0026] In one embodiment of the present invention, the resistances of the current sampling resistors are equal.

[0027] In one embodiment of the present invention, the resistance value of the current sampling resistor is in the range of 0.1 to 10 mΩ;

[0028] The current flows through the first copper sheet, through the metallized via in the upper PCB insulating layer, through the current acquisition resistor, and through the metallized via in the lower PCB insulating layer to reach the second copper sheet. That is, an electronic path is formed between the first copper sheet, the metallized via, the current acquisition resistor, the metallized via, and the second copper sheet.

[0029] The current flowing through each acquisition unit is measured by detecting the voltage (U) across each fixed current acquisition resistor, i.e., current I = U * R. 电流 .

[0030] In one embodiment of the present invention, the temperature acquisition circuit board includes a second circuit board, a temperature acquisition resistor, temperature acquisition wiring, and series circuit wiring.

[0031] The temperature acquisition resistor is set on the second circuit board by circuit printing. Different temperature acquisition resistors are connected in series by series circuit wiring. The two ends of the temperature acquisition resistor are connected to the controller by temperature acquisition wiring.

[0032] In one embodiment of the present invention, the integrated current and temperature acquisition circuit board includes a third circuit board, a current acquisition resistor, a temperature acquisition resistor, current acquisition wiring, temperature acquisition wiring, and series circuit wiring.

[0033] The third circuit board is equipped with independent current acquisition resistors and temperature acquisition resistors. The two ends of the current acquisition resistors are connected to the controller through current acquisition wiring. The two ends of the temperature acquisition resistors are connected in series with adjacent temperature acquisition resistors through series circuit wiring, and are connected to the controller through temperature acquisition wiring.

[0034] In one embodiment of the present invention, the controller acts as a constant current source to provide a constant current to the temperature acquisition resistor; the resistance value of the temperature acquisition resistor is in the range of 5 to 20 Ω.

[0035] In one embodiment of the present invention, when the signal acquisition circuit board is a current acquisition circuit board, a metallized through-hole is provided on the PCB insulating layer. The metallized through-hole is provided at both ends of the current acquisition resistor, and the metallized through-hole connects the first copper sheet or the second copper sheet and the current acquisition resistor.

[0036] In one embodiment of the present invention, when the signal acquisition circuit board is a current acquisition circuit board and a temperature acquisition circuit board...

[0037] A PCB insulating layer is provided between the current acquisition circuit board and the temperature acquisition circuit board;

[0038] Metallized vias are provided on the PCB insulating layers on both sides of the current acquisition circuit board, and the metallized vias are provided at both ends of the current acquisition resistor. Metallized vias are not provided on the PCB insulating layers on both sides of the temperature acquisition circuit board.

[0039] In one embodiment of the present invention, when the signal acquisition circuit board is an integrated current and temperature acquisition circuit board, a metallized through-hole is provided on the PCB insulating layer. The metallized through-hole is provided at both ends of the current acquisition resistor, and the metallized through-hole connects the first copper sheet or the second copper sheet and the current acquisition resistor.

[0040] In one embodiment of the present invention, the temperature acquisition wiring has equal length and consistent impedance;

[0041] The current acquisition wiring is of equal length and has the same impedance.

[0042] In one embodiment of the present invention, different current acquisition circuit boards are connected in parallel; different temperature acquisition circuit boards are connected in series.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] (1) In the fuel cell internal printed resistor type online current and temperature distribution detection device of the present invention, the resistance values ​​of the temperature acquisition resistor, the current acquisition resistor, the temperature acquisition wiring, the signal acquisition wiring and the series circuit wiring are basically consistent, which ensures the accuracy of the acquired signal.

[0045] (2) In the fuel cell internal printed resistor type online current and temperature distribution detection device of the present invention, the temperature acquisition resistor and the current acquisition resistor are designed by circuit printing. Compared with the method of embedding resistors separately, the processing technology is simplified and the processing cost is reduced. At the same time, compared with the method of externally placing the measuring resistor, since the current does not need to flow through the wiring in the PCB circuit board in the present invention, the upper limit of current measurement can be effectively increased.

[0046] (3) In the fuel cell internal printed resistive online current and temperature distribution detection device of the present invention, the gold-plated copper sheets on both sides of the sampling plate are gold-plated after being bonded together as a whole copper sheet, and then chemically etched into partitions, which ensures the flatness of the acquisition unit, effectively eliminates the measurement error caused by inconsistent pressure distribution, and improves the accuracy of the measurement results. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the sampling plate and controller in a fuel cell internal printed resistive online current and temperature distribution detection device according to the present invention;

[0048] Figure 2 This is a schematic diagram of the overall structure of the current acquisition unit in a fuel cell internal printed resistive online current and temperature distribution detection device of the present invention.

[0049] Figure 3 This is a schematic diagram showing the disassembled structure of the current acquisition unit in a fuel cell internal printed resistive online current and temperature distribution detection device according to the present invention.

[0050] Figure 4 This is a schematic diagram of the current flow path in the current acquisition unit of a fuel cell internal printed resistive online current and temperature distribution detection device according to the present invention.

[0051] Figure 5 This is a schematic diagram of the temperature acquisition unit in a fuel cell internal printed resistive online current and temperature distribution detection device according to the present invention.

[0052] Figure 6 This is a schematic diagram of the structure of the integrated current and temperature acquisition circuit board, PCB insulating layer, first copper sheet and second copper sheet in the fuel cell internal printed resistive online current and temperature distribution detection device of the present invention.

[0053] Figure 7 This is a schematic diagram of the etching process of a gold-plated copper sheet in a fuel cell internal printed resistive online current and temperature distribution detection device according to the present invention.

[0054] Figure 8This is a schematic diagram showing the positional relationship between bipolar plates, membrane electrode assemblies, and controllers in a fuel cell stack.

[0055] The diagram is labeled as follows: 1. Sampling board; 2. Controller; 3. Acquisition unit; 4. First copper sheet; 5. Second copper sheet; 6. Current acquisition circuit board; 7. Temperature acquisition circuit board; 8. Integrated current and temperature acquisition circuit board; 9. PCB insulating layer; 10. First circuit board; 11. Current acquisition resistor; 12. Current acquisition wiring; 13. Second circuit board; 14. Temperature acquisition resistor; 15. Temperature acquisition wiring; 16. Series circuit wiring; 17. Third circuit board; 18. Metallized via; 19. Bipolar plate; 20. Membrane electrode. Detailed Implementation

[0056] This invention provides an in-line current and temperature distribution detection device for a fuel cell with printed resistance, including a sampling board for signal acquisition and a controller for signal amplification and data post-processing;

[0057] The fuel cell stack consists of several bipolar plates and membrane electrode assemblies stacked together. The sampling plate is located between adjacent membrane electrode assemblies, and bipolar plates are arranged on both sides of the sampling plate.

[0058] The controller is located at both ends of the sampling plate and is disposed outside the fuel cell stack;

[0059] The sampling board is composed of several acquisition units, each acquisition unit comprising a first copper sheet, a second copper sheet, and a signal acquisition circuit board; the signal acquisition circuit board is disposed between the first copper sheet and the second copper sheet.

[0060] The signal acquisition circuit board is a current acquisition circuit board, or a current acquisition circuit board and a temperature acquisition circuit board, or a current and temperature acquisition circuit board integrated into one circuit board.

[0061] The current acquisition circuit board is used to acquire current signals, the temperature acquisition circuit board is used to acquire temperature signals, and the integrated current and temperature acquisition circuit board is used to acquire both current and temperature signals.

[0062] In one embodiment of the present invention, the acquisition units are arranged in an array;

[0063] The surfaces of the first and second copper sheets away from the signal acquisition circuit board are plated with gold.

[0064] A PCB insulating layer is provided between the signal acquisition circuit board and the first and second copper sheets.

[0065] In one embodiment of the present invention, the acquisition units are of equal area and adjacent acquisition units are electrically isolated from each other.

[0066] In one embodiment of the present invention, the upper and lower surfaces of the acquisition unit are gold-plated copper sheets. The manufacturing process is as follows: first, a flat copper sheet is pasted onto the upper and lower surfaces of the signal acquisition circuit board; then, after dividing the acquisition array, gold plating is performed; finally, the copper between each acquisition unit is etched away by etching method, thereby achieving mutual electrical isolation.

[0067] In one embodiment of the present invention, the current acquisition circuit board includes a first circuit board, a current acquisition resistor, and current acquisition wiring;

[0068] The current acquisition resistor is mounted on the first circuit board by circuit printing. The two ends of the current acquisition resistor are a first signal terminal and a second signal terminal, respectively. The first signal terminal and the second signal terminal are connected to the current acquisition wiring, which is connected to the controller.

[0069] In one embodiment of the present invention, the resistances of the current sampling resistors are equal.

[0070] In one embodiment of the present invention, the resistance value of the current sampling resistor is in the range of 0.1 to 10 mΩ;

[0071] The current flows through the first copper sheet, through the metallized via in the upper PCB insulating layer, through the current acquisition resistor, and through the metallized via in the lower PCB insulating layer to reach the second copper sheet. That is, an electronic path is formed between the first copper sheet, the metallized via, the current acquisition resistor, the metallized via, and the second copper sheet.

[0072] The current flowing through each acquisition unit is measured by detecting the voltage (U) across each fixed current acquisition resistor, i.e., current I = U * R. 电流 .

[0073] In one embodiment of the present invention, the temperature acquisition circuit board includes a second circuit board, a temperature acquisition resistor, temperature acquisition wiring, and series circuit wiring.

[0074] The temperature acquisition resistor is set on the second circuit board by circuit printing. Different temperature acquisition resistors are connected in series by series circuit wiring. The two ends of the temperature acquisition resistor are connected to the controller by temperature acquisition wiring.

[0075] In one embodiment of the present invention, the integrated current and temperature acquisition circuit board includes a third circuit board, a current acquisition resistor, a temperature acquisition resistor, current acquisition wiring, temperature acquisition wiring, and series circuit wiring.

[0076] The third circuit board is equipped with independent current acquisition resistors and temperature acquisition resistors. The two ends of the current acquisition resistors are connected to the controller through current acquisition wiring. The two ends of the temperature acquisition resistors are connected in series with adjacent temperature acquisition resistors through series circuit wiring, and are connected to the controller through temperature acquisition wiring.

[0077] In one embodiment of the present invention, the controller acts as a constant current source to provide a constant current to the temperature acquisition resistor; the resistance value of the temperature acquisition resistor is in the range of 5 to 20 Ω.

[0078] In one embodiment of the present invention, when the signal acquisition circuit board is a current acquisition circuit board, a metallized through-hole is provided on the PCB insulating layer. The metallized through-hole is provided at both ends of the current acquisition resistor, and the metallized through-hole connects the first copper sheet or the second copper sheet and the current acquisition resistor.

[0079] In one embodiment of the present invention, when the signal acquisition circuit board is a current acquisition circuit board and a temperature acquisition circuit board...

[0080] A PCB insulating layer is provided between the current acquisition circuit board and the temperature acquisition circuit board;

[0081] Metallized vias are provided on the PCB insulating layers on both sides of the current acquisition circuit board, and the metallized vias are provided at both ends of the current acquisition resistor. Metallized vias are not provided on the PCB insulating layers on both sides of the temperature acquisition circuit board.

[0082] In one embodiment of the present invention, when the signal acquisition circuit board is an integrated current and temperature acquisition circuit board, a metallized through-hole is provided on the PCB insulating layer. The metallized through-hole is provided at both ends of the current acquisition resistor, and the metallized through-hole connects the first copper sheet or the second copper sheet and the current acquisition resistor.

[0083] In one embodiment of the present invention, the temperature acquisition wiring has equal length and consistent impedance;

[0084] The current acquisition wiring is of equal length and has the same impedance.

[0085] In one embodiment of the present invention, different current acquisition circuit boards are connected in parallel; different temperature acquisition circuit boards are connected in series.

[0086] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0087] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0088] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0089] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0090] Example 1

[0091] This invention provides an in-line current and temperature distribution detection device for a fuel cell with internal printed resistive resistance, such as... Figure 1-8 As shown, it includes a sampling board 1 for signal acquisition and a controller 2 for signal amplification and data post-processing;

[0092] The fuel cell stack consists of several bipolar plates 19 and membrane electrode 20 stacked together. The bipolar plates 19 mainly function to support the stack, block reactant gases, and transfer heat and electricity. One side is the anode flow field for passing fuel gas, and the other side is the cathode flow field for passing air. The middle of the bipolar plates 19 is the cooling flow field (for passing coolant). The membrane electrode 20 is the core component of the stack and is the site of electrochemical reactions. The sampling plate 1 is placed between any two membrane electrodes 20 inside the stack. Two additional bipolar plates 19 are added to both sides of the sampling plate 1. Controllers 2 are set at both ends of the sampling plate 1 and are located on the outside of the stack.

[0093] The sampling board 1 consists of several acquisition units 3 (rectangular units of 1 square centimeter) arranged in an array with a spacing of 2mm. The acquisition units 3 have equal areas, and adjacent acquisition units 3 are electrically isolated from each other. Each acquisition unit 3 comprises a first copper sheet 4, a second copper sheet 5, and a signal acquisition circuit board. The signal acquisition circuit board is positioned between the first copper sheet 4 and the second copper sheet 5. The surfaces of the first copper sheet 4 and the second copper sheet 5 furthest from the signal acquisition circuit board are gold-plated. A PCB insulating layer 9 is provided between the signal acquisition circuit board and the first copper sheet 4 and the second copper sheet 5. The electrical isolation is achieved as follows: first, a flat copper sheet is pasted onto the top and bottom surfaces of the signal acquisition circuit board; then, after dividing the acquisition array, it is gold-plated; finally, the copper between each acquisition unit 3 is etched away using an etching method, thus achieving mutual electrical isolation. Figure 7 ).

[0094] The signal acquisition circuit board is a current acquisition circuit board 6, or a current acquisition circuit board 6 and a temperature acquisition circuit board 7, or a current and temperature integrated acquisition circuit board 8.

[0095] The current acquisition circuit board 6 is used to acquire current signals and includes a first circuit board 10, a current acquisition resistor 11, and current acquisition wiring 12 (equal in length and with consistent impedance). The current acquisition resistor 11 is printed on the first circuit board 10. The two ends of the current acquisition resistor 11 are a first signal terminal and a second signal terminal, respectively. The first signal terminal and the second signal terminal are connected to the current acquisition wiring 12, and the current acquisition wiring 12 is connected to the controller 2. The resistance of the current acquisition resistor 11 is equal, and the resistance value range of the current acquisition resistor 11 is 0.1 to 10 mΩ.

[0096] The temperature acquisition circuit board 7 is used to acquire temperature signals and includes a second circuit board 13, a temperature acquisition resistor 14 (resistance range of 5 to 20Ω), temperature acquisition wiring 15 (equal length and consistent impedance), and series circuit wiring 16 (equal length and consistent impedance). The temperature acquisition resistor 14 is set on the second circuit board 13 by circuit printing. Different temperature acquisition resistors 14 are connected in series through the series circuit wiring 16. The two ends of the temperature acquisition resistor 14 are connected to the controller 2 through the temperature acquisition wiring 15. Different temperature acquisition circuit boards 7 are connected in series.

[0097] The integrated current and temperature acquisition circuit board 8 is used to acquire current and temperature signals. It includes a third circuit board 17, a current acquisition resistor 11, a temperature acquisition resistor 14, a current acquisition wiring 12, a temperature acquisition wiring 15, and a series circuit wiring 16. The third circuit board 17 is equipped with independent current acquisition resistors 11 and 14. The two ends of the current acquisition resistor 11 are connected to the controller 2 through the current acquisition wiring 12. The two ends of the temperature acquisition resistor 14 are connected in series with adjacent temperature acquisition resistors 14 through the series circuit wiring 16, and are connected to the controller 2 through the temperature acquisition wiring 15.

[0098] When the signal acquisition circuit board is a current acquisition circuit board 6, different current acquisition circuit boards 6 are connected in parallel; a metallized through-hole 18 is provided on the PCB insulating layer 9, and the metallized through-hole 18 is provided at both ends of the current acquisition resistor 11. The metallized through-hole 18 connects the first copper sheet 4 or the second copper sheet 5 and the current acquisition resistor 11; during operation, the current flows through the first copper sheet 4, through the metallized through-hole 18 in the upper PCB insulating layer 9, through the current acquisition resistor 11, and through the metallized through-hole 18 in the lower PCB insulating layer 9 to reach the second copper sheet 5, that is, an electronic path is formed between the first copper sheet 4, the metallized through-hole 18, the current acquisition resistor 11, the metallized through-hole 18, and the second copper sheet 5.

[0099] When the signal acquisition circuit board is a current acquisition circuit board 6 and a temperature acquisition circuit board 7, a PCB insulating layer 9 is provided between the current acquisition circuit board 6 and the temperature acquisition circuit board 7; metallized through holes 18 are provided on the PCB insulating layers 9 on both sides of the current acquisition circuit board 6, and the metallized through holes 18 are provided at the two ends of the current acquisition resistor 11; no metallized through holes 18 are provided on the PCB insulating layers 9 on both sides of the temperature acquisition circuit board 7.

[0100] When the signal acquisition circuit board is a current and temperature integrated acquisition circuit board 8, a metallized through hole 18 is provided on the PCB insulating layer 9. The metallized through hole 18 is provided at both ends of the current acquisition resistor 11. The metallized through hole 18 connects the first copper sheet 4 or the second copper sheet 5 and the current acquisition resistor 11.

[0101] During operation, controller 2 acts as a constant current source to provide a constant current to temperature acquisition resistor 14. The temperature of the corresponding area is determined by measuring the voltage change across temperature acquisition resistor 14. Controller 2 calculates the current value flowing through each acquisition unit 3 by detecting the voltage signal across current acquisition resistor 11, i.e., current I = U*R current (current measurement range is 0-6A).

[0102] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A printed resistive online current and temperature distribution detection device for a fuel cell, characterized in that, It includes a sampling board (1) for signal acquisition and a controller (2) for signal amplification and data post-processing; The fuel cell stack is composed of several bipolar plates (19) and membrane electrode (20) stacked together. The sampling plate (1) is located between adjacent membrane electrode (20), and bipolar plates (19) are arranged on both sides of the sampling plate (1). The controller (2) is located at both ends of the sampling plate (1) and is disposed outside the fuel cell stack; The sampling board (1) is composed of several acquisition units (3), each acquisition unit (3) comprising a first copper sheet (4), a second copper sheet (5), and a signal acquisition circuit board; the signal acquisition circuit board is disposed between the first copper sheet (4) and the second copper sheet (5); The signal acquisition circuit board is a current acquisition circuit board (6), or a current acquisition circuit board (6) and a temperature acquisition circuit board (7), or a current and temperature acquisition circuit board (8). The current acquisition circuit board (6) is used to acquire current signals, the temperature acquisition circuit board (7) is used to acquire temperature signals, and the current and temperature integrated acquisition circuit board (8) is used to acquire both current and temperature signals. The current acquisition circuit board (6) includes a first circuit board (10), a current acquisition resistor (11), and current acquisition wiring (12). The current acquisition resistor (11) is set on the first circuit board (10) by circuit printing. The two ends of the current acquisition resistor (11) are the first signal terminal and the second signal terminal, respectively. The first signal terminal and the second signal terminal are connected to the current acquisition wiring (12), and the current acquisition wiring (12) is connected to the controller (2). The temperature acquisition circuit board (7) includes a second circuit board (13), a temperature acquisition resistor (14), a temperature acquisition wiring (15), and a series circuit wiring (16). The temperature acquisition resistor (14) is set on the second circuit board (13) by circuit printing. Different temperature acquisition resistors (14) are connected in series by series circuit wiring (16). The two ends of the temperature acquisition resistor (14) are connected to the controller (2) by temperature acquisition wiring (15).

2. The fuel cell internal printed resistive online current and temperature distribution detection device according to claim 1, characterized in that, The acquisition units (3) are arranged in an array; The surfaces of the first copper sheet (4) and the second copper sheet (5) away from the signal acquisition circuit board are plated with gold; A PCB insulating layer (9) is provided between the signal acquisition circuit board and the first copper sheet (4) and the second copper sheet (5).

3. The fuel cell internal printed resistive online current and temperature distribution detection device according to claim 1, characterized in that, The integrated current and temperature acquisition circuit board (8) includes a third circuit board (17), a current acquisition resistor (11), a temperature acquisition resistor (14), a current acquisition wiring (12), a temperature acquisition wiring (15), and a series circuit wiring (16). The third circuit board (17) is provided with an independent current acquisition resistor (11) and a temperature acquisition resistor (14). The two ends of the current acquisition resistor (11) are connected to the controller (2) through the current acquisition wiring (12). The two ends of the temperature acquisition resistor (14) are connected in series with the adjacent temperature acquisition resistor (14) through the series circuit wiring (16), and are connected to the controller (2) through the temperature acquisition wiring (15).

4. The fuel cell internal printed resistive online current and temperature distribution detection device according to claim 1, characterized in that, When the signal acquisition circuit board is a current acquisition circuit board (6), a metallized through hole (18) is provided on the PCB insulating layer (9). The metallized through hole (18) is provided at both ends of the current acquisition resistor (11). The metallized through hole (18) connects the first copper sheet (4) or the second copper sheet (5) and the current acquisition resistor (11).

5. The fuel cell internal printed resistive online current and temperature distribution detection device according to claim 1, characterized in that, When the signal acquisition circuit board is a current acquisition circuit board (6) and a temperature acquisition circuit board (7), A PCB insulating layer (9) is provided between the current acquisition circuit board (6) and the temperature acquisition circuit board (7); Metallized vias (18) are provided on the PCB insulating layer (9) on both sides of the current acquisition circuit board (6). The metallized vias (18) are provided at both ends of the current acquisition resistor (11). Metallized vias (18) are not provided on the PCB insulating layer (9) on both sides of the temperature acquisition circuit board (7).

6. The fuel cell internal printed resistive online current and temperature distribution detection device according to claim 1, characterized in that, When the signal acquisition circuit board is a current and temperature integrated acquisition circuit board (8), a metallized through hole (18) is provided on the PCB insulating layer (9). The metallized through hole (18) is provided at both ends of the current acquisition resistor (11). The metallized through hole (18) connects the first copper sheet (4) or the second copper sheet (5) and the current acquisition resistor (11).

7. The fuel cell internal printed resistive online current and temperature distribution detection device according to claim 1, characterized in that, The temperature acquisition wiring (15) has the same length and impedance; The current acquisition wiring (12) has the same length and the same impedance.

8. The fuel cell internal printed resistive online current and temperature distribution detection device according to claim 1, characterized in that, Different current acquisition circuit boards (6) are connected in parallel; different temperature acquisition circuit boards (7) are connected in series.

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