A method for improving the life of a fuel cell stack

Abstract

The present invention proposes a method for improving the life of a fuel cell stack, comprising: assembling and stacking the membrane electrode and bipolar plate of the fuel cell stack to be assembled; installing a constant pressure package on the periphery of the stacked fuel cell stack; connecting the constant pressure package to a high-pressure gas source device through a first pressure regulating valve; and introducing the pressure gas in the high-pressure gas source device into the constant pressure package to adjust the stack pressure of the fuel cell stack by controlling the switch state of the first pressure regulating valve. Through the scheme of the present invention, the irreversible thinning of the carbon paper thickness and the permanent crushing or damage of the surface can be avoided, that is, the life of the fuel cell is guaranteed; when it is found that the gas pressure needs to be appropriately increased or decreased during the use of the stack, it can be easily done by adjusting the pressure of the gas in the buffer tank, and it is not necessary to disassemble the stack like the conventional stack fastened by screws or straps.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a method for improving the life of a fuel cell stack. Background Art

[0002] Fuel cells convert the chemical energy in fuel (such as hydrogen) and oxidants (such as oxygen in the air) directly into electrical energy, and their power generation module is a fuel cell stack (referred to as a battery stack or stack). The stack is a complex composed of a membrane electrode, a bipolar plate, a current collector, an end plate, a seal, and a fastener. There are multiple membrane electrodes and multiple bipolar plates in a stack, with seals between the two. Under the action of the fastening force applied by the fasteners, the seals achieve the seal between the membrane electrode and the bipolar plate to prevent hydrogen or air from leaking from between the membrane electrode and the bipolar plate to the outside of the stack. In addition to assisting the seal in sealing, the fastening force applied by the fasteners also needs to achieve optimal contact between the membrane electrode and the bipolar plate, and minimize the contact resistance between the membrane electrode and the bipolar plate without damaging the membrane electrode.

[0003] There are two ways to fasten the stack: screws and straps. They are made of high-strength metal materials to reduce the increase in the height direction (i.e., the direction perpendicular to the surface of the membrane electrode and bipolar plate, i.e., the stacking direction of the membrane electrode and bipolar plate) of the stack due to volume expansion during operation, thereby reducing the increase in contact resistance between the membrane electrode and the bipolar plate and the risk of air leakage between the membrane electrode and the bipolar plate. Due to the limitations of high-strength screws or straps, the stack cannot expand freely during operation, and the pressure between the bipolar plate and the membrane electrode inside the stack increases significantly, far exceeding the optimal pressure during stacking, resulting in overpressure of the carbon paper in the membrane electrode, and the surface of some areas of the membrane electrode is permanently crushed or damaged. The thickness of these areas also undergoes a certain degree of irreversible thinning, which increases its contact resistance with the plate, seriously reducing the performance and life of the stack.

[0004] The current method is to add a disc spring or spring between the end plate and the fastener of the battery stack. When the pressure between the bipolar plate and the membrane electrode increases due to expansion during the operation of the battery stack, the disc spring or spring undergoes elastic contraction to relieve part of the additional pressure applied between the membrane electrode and the bipolar plate due to the expansion. The disc spring or spring can only relieve part of the additional pressure applied between the membrane electrode and the bipolar plate due to the expansion of the battery stack through elastic contraction, but it cannot completely prevent the carbon paper from being in an over-pressure state. The carbon paper will still experience irreversible thinning of thickness and permanent crushing or damage to the surface. Summary of the invention

[0005] The present invention is based on the above-mentioned problems and proposes a method for improving the life of a fuel cell stack. The scheme of the present invention can avoid the irreversible thinning of the carbon paper thickness and the permanent crushing or damage of the surface, thus ensuring the life of the fuel cell. The stack can be kept at a constant pressure by applying gas pressure, and when it is found that the gas pressure needs to be appropriately increased or decreased during the use of the stack, it can be easily adjusted by adjusting the pressure of the gas in the buffer tank, without the need to disassemble the stack like conventional stacks fastened by screws or straps.

[0006] In view of this, one aspect of the present invention provides a method for improving the life of a fuel cell stack, comprising:

[0007] Assembling and stacking the membrane electrode and bipolar plate of the fuel cell stack to be assembled;

[0008] Installing a constant pressure package on the periphery of the stacked fuel cell stack;

[0009] Connecting the constant pressure package to a high pressure gas source device via a first pressure regulating valve;

[0010] The pressure gas in the high-pressure gas source device is introduced into the constant-pressure package by controlling the switch state of the first pressure regulating valve to adjust the stack pressure of the fuel cell stack.

[0011] Optionally, the constant pressure package includes a pressure applying device and a buffer device;

[0012] The pressure applying device is arranged on the end plate of the fuel cell stack.

[0013] Optionally, the step of connecting the constant pressure package to a high pressure gas source device via a first pressure regulating valve comprises:

[0014] Connecting the pressure-applying device and the buffer device via a first vent pipe;

[0015] Connecting the buffer device to the high-pressure gas source device using a second ventilation pipe;

[0016] The first pressure regulating valve is arranged on the second ventilation pipe to control the process of the pressurized gas in the high-pressure gas source device entering the buffer device.

[0017] Optionally, the pressure applying device and the end plate are an integrated structure, specifically:

[0018] The end plate is made of metal material and has a closed cavity inside as the main structure of the pressure device;

[0019] The lower surface of the closed cavity is the outer surface of the end plate (in contact with components in the battery stack such as a current collecting plate);

[0020] A plurality of interface holes are left on the upper surface of the closed cavity;

[0021] A mounting seat for a second pressure regulating valve is reserved in the interface hole;

[0022] The second pressure regulating valve is connected to the first ventilation pipe through the interface hole;

[0023] Installing a first pressure sensor on the inner surface of the closed cavity and leading a signal line of the first pressure sensor out through the interface hole;

[0024] The peripheral wall of the closed cavity is completely fused with the end plate to seal and prevent pressure leakage.

[0025] Optionally, the step of introducing the pressurized gas in the high-pressure gas source device into the constant-pressure package to adjust the stack pressure of the fuel cell stack by controlling the switch state of the first pressure regulating valve includes:

[0026] Acquiring first initial internal pressure data of the pressure applying device;

[0027] Acquiring operating pressure data of the fuel cell stack;

[0028] generating a first regulating control instruction for the first pressure regulating valve according to the first initial internal pressure data and the working pressure data;

[0029] Controlling the switch state of the first pressure regulating valve through the first regulating control instruction to introduce the pressurized gas in the high-pressure gas source device into the buffer device;

[0030] Acquiring first current internal pressure data of the buffer device;

[0031] A second regulating control instruction is generated based on the first current internal pressure data, the first initial internal pressure data and the working pressure data to control the switching state of the second pressure regulating valve to introduce the gas in the buffer device into the pressure-applying device or to export the gas in the pressure-applying device to regulate the stack pressure of the fuel cell stack.

[0032] Optionally, the step of obtaining first initial internal pressure data of the pressure applying device includes:

[0033] The first pressure sensor is installed on the inner wall of the pressure-applying device to collect the real-time pressure signal in the pressure-applying device;

[0034] The first pressure sensor has a built-in A / D converter to digitize the pressure value;

[0035] The digital pressure signal is transmitted to the data acquisition module via a cable;

[0036] The data acquisition module encodes the digital pressure signal to obtain first initial internal pressure data, and transmits the encoded data to the data processing module via wired or wireless communication.

[0037] Optionally, the step of obtaining the operating pressure data of the fuel cell stack includes:

[0038] installing a third pressure sensor at a plurality of key locations selected between components of the fuel cell stack;

[0039] The third pressure sensor collects real-time pressure data of each area;

[0040] The data acquisition module collects the real-time pressure data of different third pressure sensors, obtains working pressure data after encoding and whole-packaging processing, and sends it to the data processing module.

[0041] Optionally, the step of generating a first regulating control instruction for the first pressure regulating valve according to the first initial internal pressure data and the working pressure data includes:

[0042] Inputting the working pressure data into a preset battery stack pressure diagnosis model to obtain pressure regulation demand data;

[0043] Obtaining pressure regulation requirement data of the pressure applying device according to the pressure regulation requirement data and the first initial internal pressure data;

[0044] Generate a regulation control instruction for the first pressure regulating valve according to the pressure regulation requirement data of the pressure applying device.

[0045] Optionally, the step of controlling the switch state of the first pressure regulating valve through the first regulating control instruction to introduce the pressurized gas in the high-pressure gas source device into the buffer device includes:

[0046] According to the first regulation control instruction, the control system sends a switch signal to the pressure regulating valve actuator;

[0047] If pressure increase is required, the pressure regulating valve actuator drives the first pressure regulating valve to open, and the gas enters the buffer device from the high-pressure gas source device to increase the pressure;

[0048] If pressure reduction is required, the pressure regulating valve actuator drives the first pressure regulating valve to close and controls the buffer device to reduce pressure.

[0049] Optionally, the method for constructing the battery stack pressure diagnosis model includes:

[0050] Collecting historical battery stack pressure data, and marking the working status of the historical battery stack pressure data, to obtain first historical battery stack pressure data;

[0051] Preprocessing the first historical battery stack pressure data and dividing it into a first training set and a first test set;

[0052] Inputting the first training set into a preset first neural network, and continuously adjusting the network weights according to the output error to obtain a first model;

[0053] The prediction performance of the first model is evaluated using the first test set, and the first model is adjusted according to the evaluation result to obtain a battery stack pressure diagnosis model.

[0054] By adopting the technical solution of the present invention, the method for improving the life of a fuel cell stack includes: assembling and stacking the membrane electrode and bipolar plate of the fuel cell stack to be assembled; installing a constant pressure package on the periphery of the stacked fuel cell stack; connecting the constant pressure package to a high-pressure gas source device through a first pressure regulating valve; and introducing the pressurized gas in the high-pressure gas source device into the constant pressure package to adjust the stack pressure of the fuel cell stack by controlling the switching state of the first pressure regulating valve. Through the scheme of the present invention, when the volume of the battery stack expands during operation, since the fastening force applied is a fixed air pressure, the battery stack can expand freely under the air pressure, and there will be no overpressure between the membrane electrode and the bipolar plate in the battery stack, thereby not causing irreversible thinning of the carbon paper thickness and permanent compression or damage to the surface, thereby ensuring the life of the fuel cell; when the battery stack stops running and shrinks in volume, under the action of the fixed pressure of the air pressure, the battery stack returns to the state at the time of initial stacking, so that a good seal is always maintained between the membrane electrode and the bipolar plate; when it is found during the use of the battery stack that the air pressure needs to be appropriately increased or decreased, it can be easily done by adjusting the pressure of the gas in the buffer tank, without the need to dismantle the stack like conventional battery stacks fastened by screws or straps. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a flow chart of a method for improving the life of a fuel cell stack provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to be able to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In addition, although the embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0057] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0058] The terms "first" and "second" in the specification and claims of the present application and the above-mentioned drawings are only used for description purposes or to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features (or describing a specific order). Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0059] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0060] Refer to the following Figure 1 A method for improving the life of a fuel cell stack according to some embodiments of the present invention is described.

[0061] like Figure 1 As shown, one embodiment of the present invention provides a method for improving the life of a fuel cell stack, comprising:

[0062] Assembling and stacking the membrane electrode and bipolar plate of the fuel cell stack to be assembled;

[0063] Installing a constant pressure package on the periphery of the stacked fuel cell stack;

[0064] Connecting the constant pressure package to a high pressure gas source device via a first pressure regulating valve;

[0065] The pressure gas in the high-pressure gas source device is introduced into the constant-pressure package by controlling the switch state of the first pressure regulating valve to adjust the stack pressure of the fuel cell stack.

[0066] In this embodiment, during the assembly of the battery stack, the optimal contact pressure when the bipolar plate and the membrane electrode are assembled is maintained by adjusting the pressure; during the operation of the battery stack, due to the volume change caused by the reaction, the constant pressure in the package can buffer the volume change, so that the pressure change over time is kept within the optimal range. After the battery stack stops running, the pressure in the package can help the battery stack return to the initial assembly state and maintain the contact performance between components. Through constant pressure packaging, the internal pressure of the battery stack is not affected by the properties of the component material itself, which can effectively prevent overpressure from damaging the components; at the same time, the operating pressure of the battery stack can be adjusted by adjusting the pressure in the package, without the need to physically disassemble and assemble the components, and it is also more convenient to replace the components. A constant pressure environment is conducive to the long-term stable operation of the battery stack and prolongs its service life. Through sensors and control systems, fine-tuning and intelligent control of pressure can also be achieved to keep the battery stack in the optimal state at all times. In short, the constant pressure package can effectively adjust and maintain the optimal contact state between the components of the battery stack by controlling the pressure.

[0067] Through the scheme of this embodiment, when the volume of the battery stack expands during the operation of the battery stack, since the fastening force applied is a fixed air pressure, the battery stack can expand freely under the air pressure, and there will be no overpressure between the membrane electrode and the bipolar plate in the battery stack, which will not cause irreversible thinning of the carbon paper thickness and permanent compression or damage to the surface, thus ensuring the life of the fuel cell; when the battery stack stops running and shrinks in volume, under the action of the fixed pressure of the air pressure, the battery stack returns to the state at the time of initial stacking, so that a good seal is always maintained between the membrane electrode and the bipolar plate; at the same time, when it is found that the air pressure needs to be appropriately increased or decreased during the use of the battery stack, it can be easily done by adjusting the pressure of the gas in the buffer tank, without the need to dismantle the stack like conventional battery stacks fastened by screws or straps.

[0068] In some possible implementations of the present invention, the constant pressure package includes a pressure applying device and a buffer device;

[0069] The pressure applying device is arranged on the end plate of the fuel cell stack.

[0070] In this embodiment, the pressure device is arranged on the end plate of the fuel cell stack, which simplifies the structural design and makes the overall assembly more compact and easier to install. The structural strength can be enhanced, and the end plate can bear the overall pressure applied by the pressure device to prevent deformation of the components due to pressure. The sealing performance is improved, and the end plate fixing the pressure device can effectively prevent leakage of pressurized gas. The positioning of components is convenient, and the embedded structure of the end plate accurately positions the relative positions of each component. The connection interface is simplified, and the inlet and outlet pipeline ports outside the end plate are connected to the packaging component, which is easy to package as a whole and connect the pipeline system. The overall packaging is more durable, and the end plate shell has the dual functions of component support and sealing, and is more resistant to environmental influences. It is easy to move and install, and the end plate is directly installed on the battery stack as a whole, which makes the operation simpler and more direct. The control signal can be transmitted at the same time, and the end plate integrated control circuit is linked with the packaging component to control the voltage regulation. The convenience of battery stack assembly and operation is improved from multiple aspects such as structure and control.

[0071] In some possible implementations of the present invention, the step of connecting the constant pressure package to the high pressure gas source device via the first pressure regulating valve includes:

[0072] Connecting the pressure-applying device and the buffer device via a first vent pipe;

[0073] Connecting the buffer device to the high-pressure gas source device using a second ventilation pipe;

[0074] The first pressure regulating valve is arranged on the second ventilation pipe to control the process of the pressurized gas in the high-pressure gas source device entering the buffer device.

[0075] In this embodiment, the pressure-applying device and the buffer device are connected by a first ventilation pipe, and the buffer device and the high-pressure gas source device are connected by a second ventilation pipe. The buffer device is arranged between the pressure-applying device and the high-pressure gas source device to buffer the flow fluctuation of the high-pressure gas, minimize the pressure shock to the pressure-applying device, and reduce the pressure shock of the equipment; it plays the role of temporarily storing high-pressure gas, and can provide pressure support for a certain period of time when the high-pressure gas source is insufficient; when the pressure of the high-pressure gas source suddenly increases, it can initially store excess gas to protect the pressure-applying device; when the high-pressure gas source is switched or a short pause occurs, it can maintain the pressure effect of the pressure-applying device and reduce the impact; it is conducive to the gradual adjustment of the pressure between the pressure-applying device and the high-pressure gas source to achieve more delicate pressure control; it exchanges and converts energy within a certain range to reduce the impact of pressure differences between systems; the buffer device can absorb dynamic changes, ensure the stability of the pressure of the pressure system, and improve the overall pressure quality and the service life of the equipment.

[0076] In some possible implementations of the present invention, the pressure applying device and the end plate are an integrated structure, specifically:

[0077] The end plate is made of metal material and has a closed cavity inside as the main structure of the pressure device;

[0078] The lower surface of the closed cavity is the outer surface of the end plate;

[0079] A plurality of interface holes are left on the upper surface of the closed cavity;

[0080] A mounting seat for a second pressure regulating valve is reserved in the interface hole;

[0081] The second pressure regulating valve is connected to the first ventilation pipe through the interface hole;

[0082] Installing a first pressure sensor on the inner surface of the closed cavity and leading a signal line of the first pressure sensor out through the interface hole;

[0083] The peripheral wall of the closed cavity is completely fused with the end plate to seal and prevent pressure leakage.

[0084] In this embodiment, the second pressure regulating valve is used to control the gas communication between the pressure-applying device and the buffer device to adjust the gas pressure in the pressure-applying device.

[0085] This embodiment simplifies the overall structure, reduces the number of components, and makes the assembly process more convenient by designing the pressure device and the end plate as an integrated structure. It can also strengthen the overall rigidity to prevent components from falling off or deforming due to external forces; improve the sealing performance to prevent pressure qualitative change and leakage; improve the service life, compact structure and more durable operation; optimize the external dimensions, and the integrated form is intuitive and easy to install; more precise positioning, the spacing and orientation of each component to meet the design requirements; tighter connection, reducing the gap points between components and improving the sealing performance; integrating control circuits, collecting instructions for real-time synchronous pressure control; more convenient integrated operation, the whole is moved and installed as a unit; higher level of intelligence, the end plate can integrate the control system to realize intelligent management of suppression. In general, the integrated design utilizes the structural support of the end plate to improve the integration and automation level of the battery stack pressure control device. In this way, the main structure of the pressure device is fully integrated into the end plate, with reliable performance and simple installation.

[0086] In some possible implementations of the present invention, the step of introducing the pressurized gas in the high-pressure gas source device into the constant pressure package to adjust the stack pressure of the fuel cell stack by controlling the switch state of the first pressure regulating valve includes:

[0087] Acquiring first initial internal pressure data of the pressure applying device;

[0088] Acquiring operating pressure data of the fuel cell stack;

[0089] generating a first regulating control instruction for the first pressure regulating valve according to the first initial internal pressure data and the working pressure data;

[0090] Controlling the switch state of the first pressure regulating valve through the first regulating control instruction to introduce the pressurized gas in the high-pressure gas source device into the buffer device;

[0091] Acquiring first current internal pressure data of the buffer device;

[0092] A second regulating control instruction is generated based on the first current internal pressure data, the first initial internal pressure data and the working pressure data to control the switching state of the second pressure regulating valve to introduce the gas in the buffer device into the pressure-applying device or to export the gas in the pressure-applying device to regulate the stack pressure of the fuel cell stack.

[0093] In this embodiment, the pressure status of different devices is monitored in real time to understand the operation of the entire pressure system; based on multi-point pressure data, an advanced control algorithm is used to accurately generate adjustment instructions; the high-voltage source and buffer device are used in an orderly manner to introduce pressure into the pressure-applying device in steps; the ultimate goal is achieved through multi-stage adjustment to achieve precise control of the pressure of the fuel cell stack; closed-loop feedback control is adopted to dynamically adjust the switch state of each valve as required; the pressure between each device is coordinated and adjusted to smoothly and efficiently meet the operating pressure requirements of the battery stack; the automation level and intelligence of the entire pressure system are improved. This embodiment realizes multi-stage pressure precision control based on multi-point data, meets the pressure requirements of the battery stack, and improves the system operation efficiency and manageability.

[0094] In some possible implementations of the present invention, the step of obtaining first initial internal pressure data of the pressure applying device includes:

[0095] The first pressure sensor is installed on the inner wall of the pressure-applying device to collect the real-time pressure signal in the pressure-applying device;

[0096] The first pressure sensor has a built-in A / D converter to digitize the pressure value;

[0097] The digital pressure signal is transmitted to the data acquisition module via a cable;

[0098] The data acquisition module encodes the digital pressure signal to obtain first initial internal pressure data, and transmits the encoded data to the data processing module via wired or wireless communication.

[0099] In this embodiment, it is also possible to monitor and record the pressure change pattern inside the package in real time; analyze whether the pressure is abnormal and detect whether the package is depressurized; provide pressure information to the advanced control system for pressure loop control; give an early warning when pressure changes occur and generate pressure reports regularly; record the details of pressure changes for a long time and analyze the law of battery stack performance changes; provide a decision-making basis for maintenance and extend service life; realize real-time monitoring of the pressure inside the package and provide important numerical support for battery stack control and management.

[0100] In some possible implementations of the present invention, the step of obtaining the operating pressure data of the fuel cell stack includes:

[0101] installing a third pressure sensor at a plurality of key locations selected between components of the fuel cell stack;

[0102] The third pressure sensor collects real-time pressure data of each area;

[0103] The data acquisition module collects the real-time pressure data of different third pressure sensors, obtains working pressure data after encoding and whole-packaging processing, and sends it to the data processing module.

[0104] In this embodiment, by collecting the internal pressure data of the fuel cell stack, it is possible to monitor whether the working pressure of the fuel cell stack has local abnormal over-limit coupling changes; identify the working pressure optimization area and potential problem area; provide a pressure distribution reference and optimize the assembly process parameters; detect the pressure fluctuation during the working process; assist in evaluating the impact of different component materials on pressure; provide experimental data for pressure detection and improve the control loop logic; and predict the degree of aging and remaining life of the battery stack during use.

[0105] In some possible implementations of the present invention, the step of generating a first regulating control instruction for the first pressure regulating valve according to the first initial internal pressure data and the working pressure data includes:

[0106] Inputting the working pressure data into a preset battery stack pressure diagnosis model to obtain pressure regulation demand data;

[0107] Obtaining pressure regulation requirement data of the pressure applying device according to the pressure regulation requirement data and the first initial internal pressure data;

[0108] Generate a regulation control instruction for the first pressure regulating valve according to the pressure regulation requirement data of the pressure applying device.

[0109] In some possible implementations of the present invention, the step of controlling the switch state of the first pressure regulating valve through the first regulation control instruction to introduce the pressurized gas in the high-pressure gas source device into the buffer device includes:

[0110] According to the first regulation control instruction, the control system sends a switch signal to the pressure regulating valve actuator;

[0111] If pressure increase is required, the pressure regulating valve actuator drives the first pressure regulating valve to open, and the gas enters the buffer device from the high-pressure gas source device to increase the pressure;

[0112] If pressure reduction is required, the pressure regulating valve actuator drives the first pressure regulating valve to close and controls the buffer device to reduce pressure.

[0113] In this embodiment, remote intelligent pressure regulation based on data instructions can be realized; the pressure regulation efficiency and accuracy are improved, and the pressure is more stable and reliable; it is easy to adjust and optimize, and is more adaptable to different working conditions of the battery stack; manual intervention is reduced and the level of automation is improved; an optimal pressure environment is created for the long-term and efficient operation of the battery stack; micro-intelligent adjustment is achieved through instruction control thresholds, and working pressure is managed more accurately.

[0114] In some possible implementations of the present invention, the method for constructing the battery stack pressure diagnosis model includes:

[0115] Collecting historical battery stack pressure data, and marking the working status of the historical battery stack pressure data (such as normal, low pressure, high pressure, etc.), to obtain first historical battery stack pressure data;

[0116] Preprocessing the first historical battery stack pressure data and dividing it into a first training set and a first test set;

[0117] Inputting the first training set into a preset first neural network (such as MLP, CNN, etc.), and continuously adjusting the network weights according to the output error to obtain a first model;

[0118] The prediction performance of the first model is evaluated using the first test set, and the first model is adjusted according to the evaluation result to obtain a battery stack pressure diagnosis model.

[0119] In this embodiment, when new pressure data is input into the battery stack pressure diagnostic model, the model will classify and predict the pressure status; based on the prediction results (normal, need to increase pressure, need to reduce pressure), it will give a pressure regulation demand output; the model will be updated in real time to gradually improve the prediction and diagnostic capabilities.

[0120] In this embodiment, through big data training, automatic diagnosis of battery stack pressure problems and judgment of adjustment measures can be achieved, providing a basis for pressure control and improving the intelligence level.

[0121] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0122] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0123] In the several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, such as the division of the above-mentioned units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0124] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0125] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0126] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory, including a number of instructions to enable a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present application. The aforementioned memory includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or CD-ROM and other media that can store program codes.

[0127] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0128] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0129] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions without departing from the spirit and scope of the present invention, and can make various changes and modifications, including the combination of the above-mentioned different functions and implementation steps, including software and hardware implementation methods, all of which are within the scope of protection of the present invention.

Claims

1. A method for increasing the life of a fuel cell stack, characterized in that: include: Assembling and stacking the membrane electrode and bipolar plate of the fuel cell stack to be assembled; Installing a constant pressure package on the periphery of the stacked fuel cell stack; Connecting the constant pressure package to a high pressure gas source device via a first pressure regulating valve; By controlling the switch state of the first pressure regulating valve, the pressurized gas in the high-pressure gas source device is introduced into the constant pressure package to adjust the stack pressure of the fuel cell stack; Wherein, the constant pressure package comprises a pressure device and a buffer device; the pressure device is arranged on the end plate of the fuel cell stack; Wherein, the step of connecting the constant pressure package to the high pressure gas source device through the first pressure regulating valve comprises: Connecting the pressure-applying device and the buffer device via a first vent pipe; Connecting the buffer device to the high-pressure gas source device using a second ventilation pipe; The first pressure regulating valve is arranged on the second ventilation pipe to control the process of the pressurized gas in the high-pressure gas source device entering the buffer device; The pressure-applying device and the end plate are an integrated structure, specifically: the end plate is made of metal material, and a closed cavity is arranged inside as the main structure of the pressure-applying device; the lower surface of the closed cavity is the outer surface of the end plate; a plurality of interface holes are reserved on the upper surface of the closed cavity; a mounting seat for a second pressure regulating valve is reserved in the interface hole; the second pressure regulating valve is connected to the first ventilation pipe through the interface hole; a first pressure sensor is installed on the inner surface of the closed cavity, and a signal line of the first pressure sensor is led out through the interface hole; the peripheral wall of the closed cavity is completely fused with the end plate, and sealed welding is performed to prevent pressure leakage; The step of introducing the pressurized gas in the high-pressure gas source device into the constant pressure package to adjust the stack pressure of the fuel cell stack by controlling the switch state of the first pressure regulating valve comprises: Acquiring first initial internal pressure data of the pressure applying device; Acquiring operating pressure data of the fuel cell stack; generating a first regulating control instruction for the first pressure regulating valve according to the first initial internal pressure data and the working pressure data; Controlling the switch state of the first pressure regulating valve through the first regulating control instruction to introduce the pressurized gas in the high-pressure gas source device into the buffer device; Acquiring first current internal pressure data of the buffer device; Generate a second regulating control instruction according to the first current internal pressure data, the first initial internal pressure data and the working pressure data to control the switch state of the second pressure regulating valve to introduce the gas in the buffer device into the pressure device or to guide the gas in the pressure device out to regulate the stack pressure of the fuel cell stack; Wherein, the step of generating the first regulating control instruction of the first pressure regulating valve according to the first initial internal pressure data and the working pressure data comprises: Inputting the working pressure data into a preset battery stack pressure diagnosis model to obtain pressure regulation demand data; Obtaining pressure regulation requirement data of the pressure applying device according to the pressure regulation requirement data and the first initial internal pressure data; Generate a regulation control instruction for the first pressure regulating valve according to the pressure regulation demand data of the pressure applying device; The method for constructing the battery stack pressure diagnosis model includes: Collecting historical battery stack pressure data, and marking the working status of the historical battery stack pressure data, to obtain first historical battery stack pressure data; Preprocessing the first historical battery stack pressure data and dividing it into a first training set and a first test set; Inputting the first training set into a preset first neural network, and continuously adjusting the network weights according to the output error to obtain a first model; The prediction performance of the first model is evaluated using the first test set, and the first model is adjusted according to the evaluation result to obtain a battery stack pressure diagnosis model.

2. The method for increasing the life of a fuel cell stack according to claim 1, characterized in that: The step of obtaining the first initial internal pressure data of the pressure applying device comprises: The first pressure sensor is installed on the inner wall of the pressure-applying device to collect the real-time pressure signal in the pressure-applying device; The first pressure sensor has a built-in A / D converter to digitize the pressure value; The digital pressure signal is transmitted to the data acquisition module via a cable; The data acquisition module encodes the digital pressure signal to obtain first initial internal pressure data, and transmits the encoded data to the data processing module via wired or wireless communication.

3. The method for increasing the life of a fuel cell stack according to claim 2, characterized in that: The step of obtaining the operating pressure data of the fuel cell stack comprises: installing a third pressure sensor at a plurality of key locations selected between components of the fuel cell stack; The third pressure sensor collects real-time pressure data of each area; The data acquisition module collects the real-time pressure data of different third pressure sensors, obtains working pressure data after encoding and whole-packaging processing, and sends it to the data processing module.

4. The method for increasing the life of a fuel cell stack according to claim 3, characterized in that: The step of controlling the switch state of the first pressure regulating valve by the first regulating control instruction to introduce the pressurized gas in the high-pressure gas source device into the buffer device includes: According to the first regulation control instruction, the control system sends a switch signal to the pressure regulating valve actuator; If pressure increase is required, the pressure regulating valve actuator drives the first pressure regulating valve to open, and the gas enters the buffer device from the high-pressure gas source device to increase the pressure; If pressure reduction is required, the pressure regulating valve actuator drives the first pressure regulating valve to close and controls the buffer device to reduce pressure.

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