Device and method for detecting bipolar plate partition current, impedance, temperature, humidity and pressure

Abstract

The present invention relates to a detection device for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance, wherein the detection device comprises: a current density, temperature, humidity and pressure measurement printed circuit board, on which measurement areas are divided according to the effective active area size of the measured battery stack, and regional array contacts are preset according to the size of each measurement area; an epoxy resin substrate, which contacts the upper side of the current density, temperature, humidity and pressure measurement printed circuit board, and the sealing groove set on the lower side of the epoxy resin substrate and the upper side of the current density, temperature, humidity and pressure measurement printed circuit board are sealed through a sealing ring; a first bipolar plate, whose negative side contacts the upper side of the epoxy resin substrate, and the upper side of the epoxy resin substrate and the sealing groove set on the negative side of the first bipolar plate are sealed through a sealing ring; a second bipolar plate located at the top layer. And the present invention also relates to a corresponding bipolar plate partition current, impedance and temperature, humidity and pressure detection method.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell technology, and in particular to the field of fuel cell performance testing technology, and specifically refers to a device and method for detecting bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balanced resistance. Background Art

[0002] The bipolar plate flow channels of fuel cells have the characteristics of low design efficiency, complex design, high change cost and long verification cycle. It is necessary to understand, verify, optimize and iterate the newly designed bipolar plate flow channel products of fuel cells through a multi-parameter and high-precision online detection system. However, large-area fuel cells will bring many non-uniformities. These non-uniformities work together to make the operating conditions of different parts of the battery different, affecting the performance and durability of the fuel cell stack.

[0003] At present, the online monitoring system of large-area fuel cells has problems such as few physical quantities that can be monitored simultaneously, low accuracy, and complex system. In addition, most traditional solutions in the industry are expensive and the delivery price cycle is restricted by the international market. Specific tooling is required, and the original installation process of the fuel cell stack needs to be judged for the consistency of the clamping force. Regarding the cathode plate flow channel parameter information, it is necessary to provide detailed process parameter indicators of the tested fuel cell stack plate, and at the same time, in-depth cooperation and development with relevant companies is required. The production and processing technology and precision requirements are very high, especially the need for high-precision CNC equipment to mill out the flow channel matching the cathode plate on the printed circuit board and cut and partition, which is costly. Because there are partition cutting lines on the surface of the flow channel of the printed circuit board, the plate flow channel gas is diverted in the cutting line area, and the gas flow channel gap will affect the state of the fluid under actual working conditions.

[0004] Therefore, in view of the shortcomings of the existing technology, it is necessary to propose a design solution that can effectively solve the uneven contact impedance, does not require the battery stack manufacturer to provide detailed bipolar plate process parameter indicators, and does not require new assembly fixtures during the assembly process to maintain the original assembly process. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device and method for detecting bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance.

[0006] In order to achieve the above-mentioned purpose, the detection device and method of bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance of the present invention are as follows:

[0007] The detection device for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balanced resistance has the following main features: the detection device comprises:

[0008] A current density, temperature, humidity and pressure measurement printed circuit board is provided, on which measurement areas are divided according to the effective active area size of the measured battery stack, and regional array contacts are preset according to the size of each measurement area;

[0009] The epoxy resin substrate is in contact with the upper side of the current density, temperature, humidity and pressure measurement printed circuit board, and the sealing groove provided on the lower side of the epoxy resin substrate is sealed with the upper side of the current density, temperature, humidity and pressure measurement printed circuit board through a sealing ring;

[0010] A first bipolar plate, wherein the female side of the first bipolar plate contacts the upper side of the epoxy resin substrate, and the upper side of the epoxy resin substrate and the sealing groove provided on the female side of the first bipolar plate are sealed by a sealing ring;

[0011] A second bipolar plate in contact with the positive side of the first bipolar plate; and

[0012] The stack end plates are respectively arranged at the top and bottom of the detection device.

[0013] Preferably, the regional array contacts are composed of a plurality of customized gold-plated spring pins.

[0014] Preferably, the spring components inside the plurality of gold-plated spring ejectors are in contact with and fit with the flow channel of the first bipolar plate through the epoxy resin substrate, thereby ensuring that the gold-plated spring ejectors are in uniform contact with each contact point on the flow channel of the first bipolar plate.

[0015] Preferably, when each of the regional array contacts is in contact with the first bipolar plate, the surface current on the first bipolar plate will be introduced into one end of the shunt resistor of the middle layer of the current density, temperature, humidity and pressure measurement printed circuit board, and the other end of the shunt resistor is in contact with the collecting surface of the bottom layer of the current density, temperature, humidity and pressure measurement printed circuit board through a via.

[0016] Preferably, the current density, temperature, humidity and pressure measurement printed circuit board is also provided with a temperature, humidity and pressure sensor array and a current density, temperature, humidity and pressure data acquisition interface.

[0017] Preferably, the epoxy resin substrate will reserve through holes according to the positions of the temperature, humidity and pressure sensor arrays on the current density, temperature, humidity and pressure measurement printed circuit board, and the cathode of the first bipolar plate will contact the surface of the temperature, humidity and pressure sensor array through the through holes of the epoxy resin isolation plate, and the data of gas temperature, humidity and pressure will be obtained through the current density, temperature, humidity and pressure data acquisition interface.

[0018] Preferably, an MEA membrane is disposed between the first bipolar plate and the second bipolar plate.

[0019] The method for detecting the bipolar plate partition current, impedance, temperature, humidity and pressure based on the contact-type balanced resistance using the above detection device is mainly characterized in that the method comprises the following steps:

[0020] (1) Using a sealing ring, the current density, temperature, humidity and pressure measurement printed circuit board and the epoxy resin substrate are packaged with the stack MEA membrane;

[0021] (2) Introduce hydrogen, air and water into the fuel cell stack, and start the fuel cell stack system to be tested to achieve normal operating conditions;

[0022] (3) After the battery stack reaches a stable operating condition, the data acquisition module of the detection device collects the partition current, partition voltage, partition temperature, partition humidity and partition pressure signals measured by the current density, temperature, humidity and pressure measurement printed circuit board, and transmits the data processing results to the test industrial control computer;

[0023] (4) The system is connected to a sinusoidal signal excitation circuit, and a preset sinusoidal wave signal is excited to the test area of ​​the current density, temperature, humidity and pressure measurement printed circuit board;

[0024] (5) Collecting the feedback signal of the current density, temperature, humidity and pressure measurement printed circuit board through the data acquisition module, and transmitting the data processing result to the test industrial control computer;

[0025] (6) The test industrial computer converts the received temperature, humidity and pressure data into a cloud map and displays it.

[0026] Preferably, the data processing result in step (3) includes:

[0027] Partition temperature value, partition humidity value, partition current value and partition voltage value.

[0028] Preferably, the data processing result in step (5) includes: partition impedance value.

[0029] The detection device and method for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact-type balanced resistance of the present invention greatly reduces the influence of contact impedance on the test results through regional array contact points, and avoids the problem of incompleteness of the flow channel caused by the printed circuit board flow channel partition cutting scheme. The difficulty of designing the current density temperature, humidity and pressure measurement printed circuit board is greatly reduced. At the same time, since it is not restricted by the segmented flow channel, it avoids the problem of the current density measurement printed circuit board needing to be redesigned due to the change of the bipolar plate flow channel design for the tested stack, which greatly saves the time cost of the test verification plan of the stack manufacturer and actively promotes the research and development progress of new fuel cell stacks and bipolar plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the gold-plated spring ejector structure.

[0031] Figure 2 This is the hierarchical structure diagram of the printed circuit board for current density, temperature, humidity and pressure measurement.

[0032] Figure 3 This is a plan view of the printed circuit board for current density, temperature, humidity and pressure measurement.

[0033] Figure 4 This is the structural block diagram of the temperature, humidity and pressure measurement principle.

[0034] Figure 5 The schematic diagram is a structural diagram of the detection device for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balanced resistance.

[0035] Figure 6 It is a cloud map containing temperature, humidity, current density, and high-frequency impedance parameters.

[0036] Figure 7 The present invention is a flow chart of a method for detecting bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance. DETAILED DESCRIPTION

[0037] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0038] Before describing in detail embodiments according to the present invention, it should be noted that, hereinafter, the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, whereby a process, method, article or apparatus comprising a series of elements includes not only these elements, but also other elements not explicitly listed or inherent to such process, method, article or apparatus.

[0039] See also Figures 1 to 4 As shown, the detection device for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balanced resistance, wherein the detection device comprises:

[0040] A current density, temperature, humidity and pressure measurement printed circuit board is provided, on which measurement areas are divided according to the effective active area size of the measured battery stack, and regional array contacts are preset according to the size of each measurement area;

[0041] The epoxy resin substrate is in contact with the upper side of the current density, temperature, humidity and pressure measurement printed circuit board, and the sealing groove provided on the lower side of the epoxy resin substrate is sealed with the upper side of the current density, temperature, humidity and pressure measurement printed circuit board through a sealing ring;

[0042] A first bipolar plate, wherein the female side of the first bipolar plate contacts the upper side of the epoxy resin substrate, and the upper side of the epoxy resin substrate and the sealing groove provided on the female side of the first bipolar plate are sealed by a sealing ring;

[0043] A second bipolar plate in contact with the positive side of the first bipolar plate; and

[0044] The stack end plates are respectively arranged at the top and bottom of the detection device.

[0045] In practical applications, this technical solution designs the external dimensions of the current density, temperature, humidity and pressure measurement printed circuit board according to the external dimension parameters of the battery stack bipolar plate. The current density, temperature, humidity and pressure measurement printed circuit board is divided into measurement areas according to the effective active area size of the measured battery stack, and the regional array contacts are preset according to the size of each area. The contact array is composed of a plurality of customized gold-plated spring ejectors. When in contact with the plate flow channel, the spring components inside the spring ejector are compressed to ensure that the contact points with the plate flow channel are evenly distributed to avoid incomplete contact.

[0046] As a preferred embodiment of the present invention, the regional array contacts are composed of a plurality of customized gold-plated spring pins.

[0047] As a preferred embodiment of the present invention, the spring components inside the several gold-plated spring ejectors are in contact and fit with the flow channel of the first bipolar plate through the epoxy resin substrate, thereby ensuring that the gold-plated spring ejectors are in uniform contact with each contact point on the flow channel of the first bipolar plate.

[0048] As a preferred embodiment of the present invention, when each of the regional array contacts is in contact with the first bipolar plate, the surface current on the first bipolar plate will be introduced into one end of the shunt resistor of the middle layer of the current density, temperature, humidity and pressure measurement printed circuit board, and the other end of the shunt resistor is in contact with the collecting surface of the bottom layer of the current density, temperature, humidity and pressure measurement printed circuit board through a via.

[0049] As a preferred embodiment of the present invention, the current density, temperature, humidity and pressure measurement printed circuit board is also provided with a temperature, humidity and pressure sensor array and a current density, temperature, humidity and pressure data acquisition interface.

[0050] As a preferred embodiment of the present invention, the epoxy resin substrate will reserve through holes according to the position of the temperature, humidity and pressure sensor array on the printed circuit board for measuring the current density, temperature, humidity and pressure. The cathode of the first bipolar plate is in contact with the surface of the temperature, humidity and pressure sensor array through the through holes of the epoxy resin isolation plate, and the data of gas temperature, humidity and pressure are obtained through the current density, temperature, humidity and pressure data acquisition interface.

[0051] In actual applications, the current density, temperature, humidity and pressure measurement printed circuit board array contacts are contacted and bonded with the bipolar plate flow channels through a matching epoxy resin isolation plate. A sealing groove is reserved on the current density, temperature, humidity and pressure measurement printed circuit board and the epoxy resin isolation plate, and sealing is achieved through a sealing rubber ring.

[0052] The regional array contacts are in contact with the bipolar plate, and the current on the plate surface is introduced into one end of the shunt resistor in the middle layer of the printed circuit board. The other end of the shunt resistor is connected to the bottom current collecting surface through a via. The potential difference between the two ends of the shunt resistor is detected by the Kelvin measurement method to obtain data such as partition current, partition impedance and partition voltage.

[0053] As a preferred embodiment of the present invention, an MEA membrane is disposed between the first bipolar plate and the second bipolar plate.

[0054] In practical applications, the principle of temperature and humidity data collection is as follows Figure 4 As shown, the epoxy resin isolation board reserves through holes at the positions of the temperature, humidity and pressure sensor arrays on the printed circuit board according to the current density, temperature, humidity and pressure measurements, and the surface of the epoxy resin isolation board is completely in contact with the surface of the temperature, humidity and pressure sensors during assembly, and the gas on the cathode plate contacts the surface of the temperature, humidity and pressure sensor array through the through holes of the epoxy resin isolation board, thereby directly acquiring the data of the gas temperature, humidity and pressure.

[0055] like Figure 5 As shown, the assembly structure of the current density, temperature, humidity and pressure measurement printed circuit board and the tested battery stack is as follows:

[0056] 1) Seal one side of the epoxy resin separator plate with the sealing groove on the cathode side of the bipolar plate through a sealing ring;

[0057] 2) Use a sealing ring to seal the current density, temperature and humidity measurement printed circuit board with the sealing groove on the other side of the epoxy resin isolation board;

[0058] 3) The sealed modules are assembled into a stack through normal assembly processes to complete the assembly of the test stack.

[0059] like Figure 7 As shown, the detection device is used to implement a method for detecting bipolar plate partition current, impedance, and temperature, humidity, and pressure based on contact balancing resistance, wherein the method comprises the following steps:

[0060] (1) Using a sealing ring, the current density, temperature, humidity and pressure measurement printed circuit board and the epoxy resin substrate are packaged with the stack MEA membrane;

[0061] (2) Introduce hydrogen, air and water into the fuel cell stack, and start the fuel cell stack system to be tested to achieve normal operating conditions;

[0062] (3) After the battery stack reaches a stable operating condition, the data acquisition module of the detection device collects the partition current, partition voltage, partition temperature, partition humidity and partition pressure signals measured by the current density, temperature, humidity and pressure measurement printed circuit board, and transmits the data processing results to the test industrial control computer;

[0063] (4) The system is connected to a sinusoidal signal excitation circuit, and a preset sinusoidal wave signal is excited to the test area of ​​the current density, temperature, humidity and pressure measurement printed circuit board;

[0064] (5) Collecting the feedback signal of the current density, temperature, humidity and pressure measurement printed circuit board through the data acquisition module, and transmitting the data processing result to the test industrial control computer;

[0065] (6) The test industrial computer converts the received temperature, humidity and pressure data into a cloud map and displays it.

[0066] As a preferred embodiment of the present invention, the data processing result in step (3) includes:

[0067] Partition temperature value, partition humidity value, partition current value and partition voltage value.

[0068] As a preferred embodiment of the present invention, the data processing result in step (5) includes: partition impedance value.

[0069] In practical applications, this technical solution greatly reduces the impact of contact impedance on test results through regional array contact points, while avoiding the incompleteness of the flow channel caused by the zoning cutting scheme of the printed circuit board flow channel.

[0070] It greatly reduces the difficulty of designing the printed circuit board for current density, temperature, humidity and pressure measurement. At the same time, since it is not restricted by the divided flow channel, it avoids the problem of redesigning the current density measurement printed circuit board due to changes in the bipolar plate flow channel design of the tested fuel cell stack. It greatly saves the time cost of the test and verification plan of the fuel cell stack manufacturer and actively promotes the research and development progress of new fuel cell stacks and bipolar plates.

[0071] The adaptive correction factor α error correction during electrical density acquisition is realized through the partition temperature compensation algorithm. The formula is shown below.

[0072] ;

[0073] The measurement system innovatively introduces the EIS electrochemical impedance spectroscopy test method, combined with the multi-parameter cloud display of temperature, humidity, and pressure, to accurately reflect the water and heat distribution in each area of ​​the fuel cell, mass transfer and heat transfer phenomena, and electrochemical reactions. The cloud diagram of parameters such as temperature, humidity, current density, and high-frequency impedance is shown in the figure. Figure 6 shown.

[0074] Compared with the existing technology, this technical solution has the following outstanding technical advantages:

[0075] 1) Reduce the difficulty of designing printed circuit boards for current density, temperature, humidity and pressure measurement;

[0076] 2) Greatly improve the reuse rate of printed circuit boards for current density, temperature, humidity and pressure measurement;

[0077] 3) Adopt high-precision self-compensation detection technology;

[0078] 4) Regional array contact technology;

[0079] 5) Can provide more internal performance parameters of the battery stack.

[0080] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0081] It should be understood that each part of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution device.

[0082] A person of ordinary skill in the art may understand that all or part of the steps of the method for implementing the above-mentioned embodiment may be completed by instructing the relevant hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one of the steps of the method embodiment or a combination thereof.

[0083] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0084] In the description of this specification, the description with reference to the terms "an embodiment", "some embodiments", "example", "specific example", or "embodiment" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0085] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0086] The detection device and method for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact-type balanced resistance of the present invention greatly reduces the influence of contact impedance on the test results through regional array contact points, and avoids the problem of incompleteness of the flow channel caused by the printed circuit board flow channel partition cutting scheme. The difficulty of designing the current density temperature, humidity and pressure measurement printed circuit board is greatly reduced. At the same time, since it is not restricted by the segmented flow channel, it avoids the problem of the current density measurement printed circuit board needing to be redesigned due to the change of the bipolar plate flow channel design for the tested stack, which greatly saves the time cost of the test verification plan of the stack manufacturer and actively promotes the research and development progress of new fuel cell stacks and bipolar plates.

[0087] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the specification and drawings should be regarded as illustrative rather than restrictive.

Claims

1. A detection device for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balanced resistance, characterized in that: The detection device comprises: A current density, temperature, humidity and pressure measurement printed circuit board is provided, on which measurement areas are divided according to the effective active area size of the measured battery stack, and regional array contacts are preset according to the size of each measurement area; The epoxy resin substrate is in contact with the upper side of the current density, temperature, humidity and pressure measurement printed circuit board, and the sealing groove provided on the lower side of the epoxy resin substrate is sealed with the upper side of the current density, temperature, humidity and pressure measurement printed circuit board through a sealing ring; A first bipolar plate, wherein the female side of the first bipolar plate contacts the upper side of the epoxy resin substrate, and the upper side of the epoxy resin substrate and the sealing groove provided on the female side of the first bipolar plate are sealed by a sealing ring; A second bipolar plate in contact with the positive side of the first bipolar plate; and Fuel stack end plates respectively arranged at the top and bottom of the detection device; The regional array contacts are composed of several customized gold-plated spring pins; The spring components inside the plurality of the gold-plated spring ejectors are in contact and fit with the flow channel of the first bipolar plate through the epoxy resin substrate, thereby ensuring that the gold-plated spring ejectors are in uniform contact with each contact point on the flow channel of the first bipolar plate; When each of the regional array contacts is in contact with the first bipolar plate, the surface current on the first bipolar plate will be introduced into one end of the shunt resistor of the middle layer of the current density, temperature, humidity and pressure measurement printed circuit board, and the other end of the shunt resistor is in contact with the collecting surface of the bottom layer of the current density, temperature, humidity and pressure measurement printed circuit board through a via.

2. The detection device for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance according to claim 1, characterized in that: The current density, temperature, humidity and pressure measurement printed circuit board is also provided with a temperature, humidity and pressure sensor array and a current density, temperature, humidity and pressure data acquisition interface.

3. The detection device for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance according to claim 2, characterized in that: The epoxy resin substrate will reserve through holes according to the position of the temperature, humidity and pressure sensor array on the printed circuit board for measuring the current density, temperature, humidity and pressure. The cathode of the first bipolar plate is in contact with the surface of the temperature, humidity and pressure sensor array through the through holes of the epoxy resin isolation plate, and the data of gas temperature, humidity and pressure are obtained through the current density, temperature, humidity and pressure data acquisition interface.

4. The detection device for bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance according to claim 3, characterized in that: An MEA membrane is arranged between the first bipolar plate and the second bipolar plate.

5. A method for detecting bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance using the detection device according to claim 4, characterized in that: The method comprises the following steps: (1) using a sealing ring to encapsulate the current density, temperature, humidity and pressure measurement printed circuit board and the epoxy resin substrate with the stack MEA membrane; (2) Introduce hydrogen, air and water into the fuel cell stack, and start the fuel cell stack system to be tested to achieve normal operating conditions; (3) After the battery stack reaches a stable operating condition, the data acquisition module of the detection device collects the partition current, partition voltage, partition temperature, partition humidity and partition pressure signals measured by the current density, temperature, humidity and pressure measurement printed circuit board, and transmits the data processing results to the test industrial control computer; (4) The system is connected to a sinusoidal signal excitation circuit, and a preset sinusoidal wave signal is excited into the test area of ​​the current density, temperature, humidity and pressure measurement printed circuit board; (5) collecting the feedback signal of the current density, temperature, humidity and pressure measurement printed circuit board through the data acquisition module, and transmitting the data processing result to the test industrial control computer; (6) The test industrial computer converts the received temperature, humidity and pressure data into a cloud map and displays it.

6. The method for detecting bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance according to claim 5, characterized in that: The data processing results in step (3) include: Partition temperature value, partition humidity value, partition current value and partition voltage value.

7. The method for detecting bipolar plate partition current, impedance, temperature, humidity and pressure based on contact balancing resistance according to claim 6, characterized in that: The data processing results in step (5) include: partition impedance values.

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