Electric pile hydrogen supply system and mixed hydrogen supply electric pile
By using the first hydrogen storage unit and the second hydrogen storage unit in the stack hydrogen supply system, and using hydrogen storage units with different hydrogen discharge temperatures to jointly supply hydrogen, the problems of slow stack start and high hydrogen supply cost caused by hydrogen supply by a single solid hydrogen storage material in the prior art are solved, and the rapid start-up of the stack and low-cost hydrogen supply are achieved.
Patent Information
- Application Number
- CN202421025774.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-05-11
AI Technical Summary
Problems caused by the use of a single solid hydrogen storage material to supply hydrogen to the stack in the prior art include the high hydrogen release temperature of magnesium-based storage alloys that lead to slow start of the stack, and the high hydrogen storage cost of rare earth alloys increases the cost of hydrogen supply.
A stack hydrogen supply system is adopted, including a first hydrogen storage unit and a second hydrogen storage unit, and hydrogen supply is supplied to the stack through different hydrogen discharge temperatures. The first hydrogen storage unit supplies hydrogen at a lower temperature, and the second hydrogen storage unit supplies hydrogen through heat exchange with the tail-discharge pipeline to increase the temperature and realizes the combined hydrogen supply of hydrogen storage units with different hydrogen discharge temperatures.
Through the combined supply of hydrogen storage units with different hydrogen release temperatures, the problems of slow stack start-up and high hydrogen supply cost caused by hydrogen supply by a single material are solved, which increases the startup time of the stack and reduces the cost of hydrogen supply.
Smart Images
Figure CN222600998U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fuel cell technology, specifically to a fuel cell stack hydrogen supply system and a hybrid hydrogen supply stack. Background Technology
[0002] Solid-state hydrogen storage materials operate at significantly lower pressures than gaseous hydrogen storage, greatly enhancing safety and demonstrating promising application prospects. Solid-state hydrogen storage materials include magnesium-based alloys, rare-earth-based alloys, and titanium-based alloys. Due to their high reserves and abundant resources, magnesium-based alloys offer the lowest cost for hydrogen storage. Conversely, the higher price of rare-earth elements results in relatively higher prices for rare-earth-based alloys.
[0003] While magnesium-based hydrogen storage alloys are inexpensive, their hydrogen release temperature is as high as 287 degrees Celsius. Using magnesium-based alloys as the hydrogen supply unit for fuel cell stacks would undoubtedly lead to slow stack startup. Although rare-earth alloys can release hydrogen at room temperature, they are expensive, and using them as the hydrogen supply unit for fuel cell stacks would undoubtedly increase hydrogen supply costs.
[0004] Currently, no effective solution has been proposed to address the problems caused by using a single solid hydrogen storage material to supply hydrogen to fuel cell stacks in existing technologies. Utility Model Content
[0005] In view of this, the present invention provides a hydrogen supply system for fuel cell stacks and a hybrid hydrogen supply fuel cell stack, so as to at least solve the problems caused by using a single solid hydrogen storage material for fuel cell stack hydrogen supply in the prior art.
[0006] The present invention provides the following technical solutions:
[0007] This utility model provides a hydrogen supply system for a fuel cell stack, used to supply hydrogen to the fuel cell stack. The fuel cell stack is connected to an inlet pipe and an exhaust pipe, the exhaust pipe being used to output the exhaust gas from the fuel cell stack. The system is characterized by comprising:
[0008] The first hydrogen storage unit is connected to the gas inlet pipe of the fuel cell stack via a first gas supply pipe and a first valve is provided on the first gas supply pipe. The first hydrogen storage unit is used to supply hydrogen to the fuel cell stack when its own temperature reaches a first hydrogen release temperature.
[0009] The second hydrogen storage unit is connected to the gas inlet pipe of the fuel cell stack via a second gas supply pipe. A second valve is installed on the second gas supply pipe, and the second hydrogen storage unit is located close to the tailpipe. The second hydrogen storage unit can exchange heat with the tailpipe to increase its own temperature, and when its own temperature reaches the second hydrogen release temperature, it supplies hydrogen to the fuel cell stack. The second hydrogen release temperature is higher than the first hydrogen release temperature.
[0010] Furthermore, the hydrogen supply system for the fuel cell stack also includes:
[0011] A heating unit is disposed on the first gas delivery pipeline and is used to heat the hydrogen gas in the first gas delivery pipeline.
[0012] Furthermore, the hydrogen supply system for the fuel cell stack also includes:
[0013] A temperature detection unit is disposed on the second hydrogen storage unit and is used to detect the temperature of the second hydrogen storage unit.
[0014] Furthermore, the tailpipe is wound around the second hydrogen storage unit to improve heat exchange between the tailpipe and the second hydrogen storage unit.
[0015] Furthermore, the tailpipe includes:
[0016] Multiple sub-pipes are spaced apart around the second hydrogen storage unit to improve heat exchange between the tailpipe and the second hydrogen storage unit.
[0017] Furthermore, the hydrogen supply system for the fuel cell stack also includes:
[0018] An inflation pipe is provided, with its two ends connected to the second gas supply pipe and the first hydrogen storage unit, respectively, for supplying hydrogen to the first hydrogen storage unit when the second hydrogen storage unit is vented.
[0019] Furthermore, the gas filling pipe is equipped with a one-way valve and / or a third valve to prevent hydrogen from flowing back into the second hydrogen storage unit from the first hydrogen storage unit.
[0020] Furthermore, the hydrogen supply system for the fuel cell stack also includes:
[0021] A return gas pipe, the two ends of which are connected to the gas inlet pipe of the fuel cell stack and the gas outlet of the fuel cell stack, respectively, is used to return the hydrogen gas in the fuel cell stack to the gas inlet pipe so as to mix with the hydrogen gas in the gas inlet pipe.
[0022] Furthermore, the hydrogen supply system for the fuel cell stack also includes:
[0023] An ejector is disposed in the inlet pipe of the fuel cell stack and is used to mix the hydrogen returning to the inlet pipe from the return pipe with the hydrogen in the inlet pipe.
[0024] This utility model embodiment also provides a hybrid hydrogen supply stack, including:
[0025] fuel cell stack body;
[0026] The hydrogen supply system for the fuel cell stack described above is connected to the fuel cell stack body;
[0027] The control unit is electrically connected to the first valve, the second valve, and the temperature detection unit in the hydrogen supply system of the fuel cell stack, respectively, so as to control the opening or closing of the first valve and the second valve according to the temperature detected by the temperature detection unit.
[0028] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this utility model include at least the following:
[0029] This invention discloses a hydrogen supply system for a fuel cell stack. It utilizes a first hydrogen storage unit and a second hydrogen storage unit to supply hydrogen to the stack. The first hydrogen storage unit's first hydrogen release temperature is lower than the second hydrogen release temperature of the second hydrogen storage unit. This allows the first hydrogen storage unit to supply hydrogen to the stack first, enabling the stack to release high-temperature exhaust gas through a tailpipe. The second hydrogen storage unit then exchanges heat with the tailpipe, allowing its temperature to reach the second hydrogen release temperature. Once the second hydrogen storage unit reaches this temperature, it supplies hydrogen to the stack, and the first hydrogen storage unit stops supplying hydrogen. This system allows hydrogen storage units with different hydrogen release temperatures to supply hydrogen to the stack, solving the problems associated with using a single hydrogen supply material in existing technologies. It also improves stack start-up time and reduces hydrogen supply costs. Attached Figure Description
[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the structure of a hydrogen supply system for an electric fuel cell stack according to an embodiment of the present invention.
[0032] 1. Fuel cell stack; 2. Inlet pipe; 3. Tail exhaust pipe; 4. First hydrogen storage unit; 5. First gas delivery pipe; 6. First valve; 7. Second hydrogen storage unit; 8. Second gas delivery pipe; 9. Second valve; 10. Heating unit; 11. Temperature detection unit; 12. Gas filling pipe; 13. One-way valve; 14. Third valve; 15. Return gas pipe; 16. Ejector. Detailed Implementation
[0033] The embodiments of this application will now be described in detail with reference to the accompanying drawings.
[0034] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0035] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.
[0036] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0037] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.
[0038] Solid-state hydrogen storage requires only 3–4 MPa, one-eighth the pressure of gaseous hydrogen storage, significantly improving safety. Metal hydride hydrogen storage is the most promising branch of solid-state hydrogen storage, mainly including magnesium-based alloy hydrogen storage, rare-earth alloy hydrogen storage, and titanium alloy hydrogen storage. Magnesium-based materials have high reserves and abundant resources, and magnesium-based hydrogen storage alloys are the cheapest, but their hydrogen release temperature reaches 287℃. While rare-earth alloy hydrogen storage can store and release hydrogen at room temperature and low pressure, their price is high, making their use for hydrogen supply to fuel cell stacks costly and difficult to promote.
[0039] Currently, there are five main types of fuel cells: proton exchange membrane fuel cells (PEMFC), alkaline fuel cells (AFC), solid oxide fuel cells (SOFC), molten carbonate fuel cells (MCFC), and phosphoric acid fuel cells (PAFC). Among these, solid oxide fuel cells operate at very high temperatures (600-1000℃), eliminating the need for precious metal catalysts and significantly reducing costs. Solid oxide fuel cells are also the most sulfur-resistant type of fuel cell, tolerating several orders of magnitude more sulfur than other fuel cells. Furthermore, solid oxide fuel cells do not suffer from carbon monoxide poisoning. However, the disadvantage of solid oxide fuel cells lies in their high operating temperature, which leads to slow start-up.
[0040] Existing SOFC stacks operate at temperatures between 600 and 1000°C and require preheating before operation. Currently, this is achieved by heating the cathode and anode gases, allowing the superheated reaction gases to enter the stack for preheating. However, magnesium-based hydrogen storage alloys only begin releasing hydrogen at 287°C, meaning they must be heated to generate hydrogen before preheating the stack. This further prolongs the SOFC start-up time and increases power consumption. Rare-earth-based hydrogen storage alloys can release hydrogen at room temperature, but they are expensive. Using rare-earth-based alloys exclusively for hydrogen supply would significantly increase system costs.
[0041] Based on this, the present invention proposes a solution: This invention provides a hydrogen supply system for an SOFC stack. By using a small rare-earth metal hydrogen storage device as a start-up gas source, hydrogen can be generated at room temperature to preheat the SOFC stack 1. After the stack 1 reaches its operating temperature and begins self-heating, the waste heat from the exhaust gas at 600℃-800℃ is used to heat the magnesium-based hydrogen storage device. Once the magnesium-based hydrogen storage device reaches 287℃ and begins releasing hydrogen, the gas supply valve of the rare-earth hydrogen storage device is closed, and hydrogen is supplied by the magnesium-based hydrogen storage device instead. This solves the problem of using a single material to supply hydrogen to the stack 1 in the prior art. Simultaneously supplying hydrogen to the stack 1, the magnesium-based hydrogen storage device also charges the rare-earth hydrogen storage device with hydrogen for the next start-up.
[0042] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.
[0043] Example 1
[0044] like Figure 1As shown in the figure, this utility model embodiment provides a hydrogen supply system for a fuel cell stack 1, which supplies hydrogen to the fuel cell stack 1. The fuel cell stack 1 is connected to an inlet pipe 2 and an exhaust pipe 3. The exhaust pipe 3 is used to output the exhaust gas in the fuel cell stack 1. The system includes a first hydrogen storage unit 4 and a second hydrogen storage unit 7. The first hydrogen storage unit 4 is connected to the inlet pipe 2 of the fuel cell stack 1 through a first gas supply pipe 5, and a first valve 6 is provided on the first gas supply pipe 5. The first hydrogen storage unit 4 supplies hydrogen to the fuel cell stack 1 when its own temperature reaches a first hydrogen release temperature. The second hydrogen storage unit 7 is connected to the inlet pipe 2 of the fuel cell stack 1 through a second gas supply pipe 8, and a second valve 9 is provided on the second gas supply pipe 8. The second hydrogen storage unit 7 is located close to the exhaust pipe 3. The second hydrogen storage unit 7 can exchange heat with the exhaust pipe 3 to increase its own temperature, and supplies hydrogen to the fuel cell stack 1 when its own temperature reaches a second hydrogen release temperature, which is higher than the first hydrogen release temperature.
[0045] The first hydrogen storage unit 4 has a lower first hydrogen release temperature, allowing it to release hydrogen at a lower temperature.
[0046] For example, when the first hydrogen storage unit 4 is a rare earth-based hydrogen storage device, it can release hydrogen at room temperature, so the first hydrogen storage unit 4 can be used to supply hydrogen to the fuel cell stack 1 first, thereby reducing the start-up time of the fuel cell stack 1.
[0047] The first valve 6 is used to close or open the first gas pipeline 5.
[0048] Among them, the second hydrogen storage unit 7 has a higher second hydrogen release temperature. Because of its higher hydrogen release temperature, it can increase its own temperature during the heat exchange with the tailpipe 3 until its own temperature reaches the second hydrogen release temperature in order to release hydrogen.
[0049] For example, the second hydrogen storage unit 7 can be a magnesium-based alloy hydrogen storage device. The hydrogen release temperature of the magnesium-based hydrogen storage device is 287 degrees Celsius. Therefore, during the heat exchange process between the second hydrogen storage unit 7 and the tailpipe 3, when the temperature of the second hydrogen storage unit 7 reaches 287 degrees Celsius, the second hydrogen storage unit 7 can supply hydrogen to the fuel cell stack 1.
[0050] The second valve 9 is used to close or open the second gas pipeline 8.
[0051] Because the exhaust gas temperature of the fuel cell stack 1 is 600-800 degrees Celsius, the temperature of the exhaust pipe 3 is also relatively high. As a result, the exhaust pipe 3 can exchange heat with the second hydrogen storage unit 7 to increase the temperature of the second hydrogen storage unit 7, so that the second hydrogen storage unit 7 can reach the second hydrogen release temperature.
[0052] Specifically, when the fuel cell stack 1 starts working, since the first hydrogen release temperature of the first hydrogen storage unit 4 is relatively low, the first valve 6 can be opened first to supply hydrogen to the fuel cell stack 1 using the first hydrogen storage unit 4. At this time, the fuel cell stack 1 starts working and outputs high-temperature exhaust gas. The exhaust pipe 3 increases its own temperature along with the high-temperature exhaust gas, so that the exhaust pipe 3 can exchange heat with the second hydrogen storage unit 7 to increase the temperature of the second hydrogen storage unit 7. When the temperature of the second hydrogen storage unit 7 reaches the second hydrogen release temperature, the second valve 9 is opened and the first valve 6 is closed, and the second hydrogen storage unit 7 is used to supply hydrogen to the fuel cell stack 1, thereby achieving joint hydrogen supply to the fuel cell stack 1.
[0053] In some embodiments, the hydrogen supply system for the fuel cell stack also includes a heating unit 10, which is disposed on the first gas supply pipe 5 and is used to heat the hydrogen in the first gas supply pipe 5 so that the hydrogen entering the fuel cell stack 1 is kept at a certain temperature so that the fuel cell stack 1 can work quickly.
[0054] Among them, the heating unit 10 is heated by an external heat source, such as a heating device installed outside the first gas pipeline 5.
[0055] In some embodiments, the hydrogen supply system for the fuel cell stack also includes a temperature detection unit 11, which is disposed on the second hydrogen storage unit 7 and is used to detect the temperature of the second hydrogen storage unit 7.
[0056] The temperature of the second hydrogen storage unit 7 is detected by the temperature detection unit 11, so that the staff can obtain the real-time temperature of the second hydrogen storage unit 7 through the temperature detection unit 11. When the staff knows through the temperature detection unit 11 that the temperature of the second hydrogen storage unit 7 has reached the second hydrogen release temperature, the first valve 6 can be closed so that the second hydrogen storage unit 7 can supply hydrogen to the fuel cell stack 1 alone.
[0057] The temperature detection unit 11 can be a temperature sensor.
[0058] In some embodiments, the tailpipe 3 is wound around the second hydrogen storage unit 7 to improve heat exchange between the tailpipe 3 and the second hydrogen storage unit 7, thereby rapidly increasing the temperature of the second hydrogen storage unit 7.
[0059] For example, the tailpipe 3 has a certain length, and when it is installed, the tailpipe 3 is wrapped around the second hydrogen storage unit 7 in the circumferential or axial direction, and the outlet of the tailpipe 3 extends away from the second hydrogen storage unit 7.
[0060] In some embodiments, the tailpipe 3 is configured with a flat structure near the second hydrogen storage unit 7 to increase heat exchange between the tailpipe 3 and the second hydrogen storage unit 7, thereby rapidly increasing the temperature of the second hydrogen storage unit 7.
[0061] In some embodiments, the tailpipe 3 includes multiple sub-pipes spaced apart around the second hydrogen storage unit 7 to improve heat exchange between the tailpipe 3 and the second hydrogen storage unit 7.
[0062] Specifically, the tailpipe 3 includes a first sub-outlet pipe and multiple sub-pipes. The first sub-outlet pipe is connected to the fuel cell stack 1 and is used to obtain the high-temperature tail gas output by the fuel cell stack 1. The multiple sub-pipes are respectively connected to the first sub-outlet pipe and are arranged around the second hydrogen storage unit 7 to improve the heat exchange between the tailpipe 3 and the second hydrogen storage unit 7.
[0063] Among them, tailpipe 3 is a high-temperature resistant pipe.
[0064] In some embodiments, the hydrogen supply system for the fuel cell stack also includes a gas filling pipe 12, the two ends of which are connected to a second gas delivery pipe 8 and a first hydrogen storage unit 4, respectively, for supplying hydrogen to the first hydrogen storage unit 4 when the second hydrogen storage unit 7 is vented.
[0065] Specifically, after the second hydrogen storage unit 7 reaches the second hydrogen release temperature, the first hydrogen storage unit 4 is shut down, and the hydrogen released in the second hydrogen storage unit 7 can be transported to the first hydrogen storage unit 4 to replenish the first hydrogen storage unit 4.
[0066] Furthermore, a one-way valve 13 and / or a third valve 14 are provided on the gas filling pipe 12 to prevent hydrogen in the first hydrogen storage unit 4 from flowing back into the second hydrogen storage unit 7.
[0067] In some embodiments, the hydrogen supply system of the fuel cell stack also includes a return gas pipe 15, the two ends of which are connected to the gas inlet pipe 2 of the fuel cell stack 1 and the gas outlet of the fuel cell stack 1, respectively. The return gas pipe 15 is used to return the hydrogen in the fuel cell stack 1 to the gas inlet pipe 2 so as to mix with the hydrogen in the gas inlet pipe 2, thereby increasing the temperature of the hydrogen entering the fuel cell stack 1 and thus improving the combustion efficiency of the fuel cell stack 1.
[0068] Furthermore, the hydrogen supply system of the fuel cell stack also includes an ejector 16, which is disposed in the gas inlet pipe 2 of the fuel cell stack 1, and is used to mix the hydrogen that flows back to the gas inlet pipe 2 from the return gas pipe 15 and the hydrogen in the gas inlet pipe 2.
[0069] Ejector 16 is used to realize the recycling of hydrogen, improve system energy efficiency, and also enable heat exchange between the lower temperature hydrogen entering the stack and the higher temperature hydrogen exiting the stack, reducing the internal temperature difference of the fuel cell stack 1 and improving the performance of the fuel cell stack 1.
[0070] The specific working method of this utility model is as follows:
[0071] When the fuel cell stack 1 starts up, the first valve 6 is opened so that the first hydrogen storage unit 4 supplies hydrogen to the fuel cell stack 1. At the same time, the heating unit 10 heats the first gas pipeline 5. The hydrogen gas released by the first hydrogen storage unit 4 is heated by the heating unit 10 and then introduced into the fuel cell stack 1 to preheat the fuel cell stack 1.
[0072] The fuel cell stack 1 slowly heats up and begins to react and self-heat. The high-temperature exhaust gas is discharged and heats the second hydrogen storage unit 7 through the tailpipe 3 wrapped around the surface of the second hydrogen storage unit 7.
[0073] When the staff detects through the temperature detection unit 11 that the internal temperature of the second hydrogen storage unit 7 has reached the second hydrogen release temperature, the first valve 6 and the heating unit 10 are closed, while the second valve 9 and the third valve 14 are opened at the same time, so that the second hydrogen storage unit 7 can simultaneously supply hydrogen to the fuel cell stack 1 and the first hydrogen storage unit 4, so that the first hydrogen storage unit 4 can prepare for the next start-up of the fuel cell stack 1.
[0074] This invention provides a hydrogen supply system for a fuel cell stack, which enables a magnesium-based hydrogen storage device with a high hydrogen release temperature and a rare-earth-based hydrogen storage device with a low hydrogen release temperature to jointly supply hydrogen to the fuel cell stack 1. This allows the two devices to complement each other's advantages, integrate well with the solid-state fuel cell system, accelerate the start-up of the fuel cell stack 1, and solve the problem that the magnesium-based alloy hydrogen storage device requires a continuous high-temperature heat source to release hydrogen.
[0075] This invention's hydrogen supply system significantly reduces costs compared to using rare-earth hydrogen storage alone, while noticeably improving start-up time compared to using magnesium-based hydrogen storage alone, thus complementing each other's advantages. Furthermore, magnesium-based hydrogen storage requires continuous heating from an external heat source to maintain a temperature of around 300°C before hydrogen release, while SOFC exhaust gas reaches 600°C-800°C, providing a large amount of waste heat that can be reused, making the two systems a perfect match.
[0076] Example 2
[0077] This utility model provides a hybrid hydrogen supply stack, including a stack body, a hydrogen supply system as described in Embodiment 1, and a control unit. The hydrogen supply system as described in Embodiment 1 is connected to the stack body; the control unit is electrically connected to a first valve 6, a second valve 9, and a temperature detection unit 11 in the hydrogen supply system, respectively, to control the opening or closing of the first valve 6 and the second valve 9 based on the temperature detected by the temperature detection unit 11.
[0078] Specifically, when the control unit detects that the temperature of the temperature detection unit 11 has reached the second hydrogen release temperature, the control unit controls the first valve 6 to close and the second valve 9 to switch the hydrogen supply from the first hydrogen storage unit 4 to the second hydrogen storage unit 7.
[0079] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions in the system embodiments.
[0080] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A fuel cell stack hydrogen supply system, used for providing hydrogen to a fuel cell stack, wherein the fuel cell stack is connected to an intake pipe and a tail exhaust pipe, wherein the tail exhaust pipe is used for outputting tail gas in the fuel cell stack, characterized in that: include: A first hydrogen storage unit, wherein the first hydrogen storage unit is connected to an air intake pipe of the fuel cell stack through a first gas pipeline, and a first valve is provided on the first gas pipeline, and the first hydrogen storage unit is used to supply hydrogen to the fuel cell stack when its own temperature reaches a first hydrogen release temperature; A second hydrogen storage unit, wherein the second hydrogen storage unit is connected to an air intake pipe of the fuel cell stack through a second gas pipeline, a second valve is provided on the second gas pipeline, and the second hydrogen storage unit is arranged close to the tail exhaust pipe, the second hydrogen storage unit can perform heat exchange with the tail exhaust pipe to increase its own temperature, and supply hydrogen to the fuel cell stack when its own temperature reaches a second hydrogen decomposition temperature, and the second hydrogen decomposition temperature is higher than the first hydrogen decomposition temperature.
2. The fuel cell hydrogen supply system according to claim 1, characterized in that: Also includes: A heating unit is disposed on the first gas pipeline and is used to heat the hydrogen in the first gas pipeline.
3. The fuel cell hydrogen supply system according to claim 1, characterized in that: Also includes: A temperature detection unit is provided on the second hydrogen storage unit and is used to detect the temperature of the second hydrogen storage unit.
4. The fuel cell stack hydrogen supply system according to claim 1, characterized in that: The tail exhaust pipe is wound around the second hydrogen storage unit to improve heat exchange between the tail exhaust pipe and the second hydrogen storage unit.
5. The fuel cell stack hydrogen supply system according to claim 1, characterized in that: The tail exhaust pipeline comprises: A plurality of sub-pipes are arranged at intervals around the second hydrogen storage unit to improve heat exchange between the tail exhaust pipe and the second hydrogen storage unit.
6. The fuel cell stack hydrogen supply system according to claim 1, characterized in that: Also includes: An air filling pipeline, both ends of which are respectively connected to the second gas pipeline and the first hydrogen storage unit, and is used to transport hydrogen to the first hydrogen storage unit when the second hydrogen storage unit is deflated.
7. The fuel cell stack hydrogen supply system according to claim 6, characterized in that: The inflation pipe is provided with a one-way valve and / or a third valve to prevent the hydrogen in the first hydrogen storage unit from flowing back into the second hydrogen storage unit.
8. The fuel cell stack hydrogen supply system according to claim 1, characterized in that: Also includes: A return air duct, both ends of which are respectively connected to the air intake duct of the fuel cell stack and the air outlet of the fuel cell stack, and is used to return the hydrogen in the fuel cell stack to the air intake duct to mix with the hydrogen in the air intake duct.
9. The fuel cell stack hydrogen supply system according to claim 8, characterized in that: Also includes: An ejector is disposed in the intake duct of the fuel cell stack and is used to mix the hydrogen refluxed from the return duct to the intake duct with the hydrogen in the intake duct.
10. A hybrid hydrogen supply stack, characterized in that: include: Battery stack body; The fuel cell stack hydrogen supply system according to claim 1, wherein the fuel cell stack hydrogen supply system is connected to the fuel cell stack body; A control unit is electrically connected to the first valve, the second valve, and the temperature detection unit in the fuel cell hydrogen supply system, respectively, so as to control the opening or closing of the first valve and the second valve according to the temperature detected by the temperature detection unit.