Fuel cell parallel operation system and fuel cell vehicle

Abstract

The utility model discloses a fuel cell parallel operation system and a fuel cell vehicle, and relates to the technical field of hydrogen fuel cells, and the fuel cell parallel operation system comprises at least two fuel cell operation lines; the input end of the alternating current output bus is connected with the output ends of all the fuel cell operation lines; wherein the fuel cell operation circuit comprises a fuel cell pack, a conversion module and an isolation transformer which are connected in sequence, and the other end of the isolation transformer is connected with the input end of the alternating current output bus; the isolation transformer is used for receiving the alternating-current filtering signal and responding to the alternating-current filtering signal to isolate electrical connection between different fuel cell operation lines so as to protect the fuel cell operation lines, and the alternating-current output bus is used for receiving the alternating-current filtering signal output by the fuel cell operation lines and responding to the alternating-current filtering signal to output a power supply signal. According to the invention, the safety of the fuel cell system can be improved while the output power is ensured.

Description

Technical Field

[0001] The present application relates to the field of hydrogen fuel cell technology, and in particular to a fuel cell parallel operation system and a fuel cell vehicle. Background Art

[0002] A hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. Due to its advantages of being pollution-free, noise-free and highly efficient, it is widely used in many technical fields such as automotive energy and aerospace energy.

[0003] In the related art, multiple fuel cells are generally connected in parallel electrically to form a fuel cell parallel operation system to provide higher output power. However, there are differences in grounding potential between different fuel cells. Multiple fuel cells connected in parallel may cause electrical interactions between different fuel cells, thereby causing failures and accidents in the fuel cell system, reducing the safety of the fuel cell system. How to improve the safety of the fuel cell system while ensuring output power is an issue that needs to be discussed and resolved urgently. Utility Model Content

[0004] The present application aims to solve one of the technical problems existing in the prior art. To this end, the present application proposes a fuel cell parallel operation system and a fuel cell vehicle, which can improve the safety of the fuel cell system while ensuring the output power.

[0005] In order to solve the above technical problems, this application proposes the following technical solutions:

[0006] The first embodiment of the present application provides a fuel cell parallel operation system, comprising:

[0007] At least two fuel cell operation circuits;

[0008] An AC output bus, the input end of which is connected to the output ends of all the fuel cell operation circuits;

[0009] Wherein, the fuel cell operation circuit includes a fuel cell group, a conversion module and an isolation transformer connected in sequence, and the other end of the isolation transformer is connected to the input end of the AC output bus, wherein the fuel cell group is used to output a high-voltage DC signal, the conversion module is used to receive the high-voltage DC signal and convert the high-voltage DC signal into an AC filtered signal for output, the isolation transformer is used to receive the AC filtered signal and isolate the electrical connection between different fuel cell operation circuits in response to the AC filtered signal to protect the fuel cell operation circuit, and the AC output bus is used to receive the AC filtered signal output by the fuel cell operation circuit, and output a power supply signal in response to the AC filtered signal.

[0010] The fuel cell parallel operation system according to the embodiment of the first aspect of the present application has at least the following beneficial effects: the fuel cell parallel operation system of the present application includes at least two fuel cell operation circuits. In actual operation conditions, the fuel cell group in the fuel cell operation circuit outputs a high-voltage DC signal, and the conversion module converts the high-voltage DC signal into an AC filtered signal and outputs it to the isolation transformer. One end of the isolation transformer is connected to the conversion module, and the other end is connected to the AC output bus. Because the output ends of all fuel cell operation circuits are connected to the AC output bus, by setting up the isolation transformer in this way, the fuel cell group and other fuel cell operation circuits can be effectively isolated, reducing the possibility of electrical interference between the fuel cell operation circuits, thereby improving the safety of the fuel cell system while ensuring the output power.

[0011] According to an embodiment of the first aspect of the present application, the conversion module includes an inverter, the input end of the inverter is connected to the output end of the fuel cell group, and the inverter is used to receive the high-voltage DC signal and convert the high-voltage DC signal into an AC signal for output.

[0012] According to an embodiment of the first aspect of the present application, the conversion module also includes a filter, the input end of the filter is connected to the output end of the converter, the output end of the filter is connected to the input end of the isolation transformer, and the filter is used to receive the AC signal and filter out the harmonic components in the AC signal to output an AC filtered signal to the isolation transformer.

[0013] According to an embodiment of the first aspect of the present application, the fuel cell operation circuit also includes a fast fuse, one end of the fast fuse is connected to the output end of the fuel cell group, and the other end of the fast fuse is connected to the input end of the converter, and the fast fuse is used for overload protection.

[0014] According to an embodiment of the first aspect of the present application, the fuel cell operating circuit also includes a bus switch, one end of the bus switch is connected to the output end of the isolation transformer, and the other end of the bus switch is connected to the input end of the AC output bus, and the bus switch is used to open or close to control the connection between the fuel cell operating circuit and the AC output bus.

[0015] According to an embodiment of the first aspect of the present application, a voltage sampling device is also provided on the AC output bus, and the voltage sampling device is used to monitor the size of the power supply signal in real time.

[0016] According to an embodiment of the first aspect of the present application, a load is further provided on the AC output bus, and the load is used to adjust the size of the power supply signal.

[0017] According to an embodiment of the first aspect of the present application, the isolation transformer is a surge isolation transformer.

[0018] According to an embodiment of the first aspect of the present application, the rated capacity of the isolation transformer is the same as the power of the fuel cell parallel operation system.

[0019] A second aspect of the present application provides a fuel cell vehicle, comprising:

[0020] Frame;

[0021] A fuel cell parallel operation system as described in the first aspect embodiment of the present application.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 Schematic diagram of a fuel cell parallel operation system according to an embodiment of the present application.

[0025] Reference numerals: fuel cell operation circuit 100 ; fuel cell stack 110 ; conversion module 120 ; converter 121 ; filter 122 ; isolation transformer 130 ; fast fuse 140 ; ​​busbar 150 ; AC output bus 200 . DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0027] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0030] A hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. It is widely used in many technical fields such as automotive energy and aerospace energy because of its advantages of being pollution-free, noise-free and highly efficient. In related technologies, a fuel cell parallel operation system is generally formed by electrically connecting multiple fuel cells in parallel to provide higher output power. However, there are differences in grounding potential between different fuel cells. Connecting multiple fuel cells in parallel may cause electrical interactions between different fuel cells, thereby causing failures and accidents in the fuel cell system and reducing the safety of the fuel cell system. How to improve the safety of the fuel cell system while ensuring output power is an issue that needs to be discussed and resolved urgently.

[0031] Based on this, the fuel cell parallel operation system of the present application can improve the safety of the fuel cell system while ensuring the output power.

[0032] Reference Figure 1 , Figure 1Schematic diagram of a fuel cell parallel operation system of an embodiment of the present application. It can be understood that the fuel cell parallel operation system of the present application includes: at least two fuel cell operation circuits 100; an AC output bus 200, the input end of the AC output bus 200 is connected to the output end of all fuel cell operation circuits 100; wherein the fuel cell operation circuit 100 includes a fuel cell group 110, a conversion module 120 and an isolation transformer 130 connected in sequence, and the other end of the isolation transformer 130 is connected to the input end of the AC output bus 200, wherein the fuel cell group 110 is used to output a high-voltage DC signal, the conversion module 120 is used to receive the high-voltage DC signal and convert the high-voltage DC signal into an AC filter signal for output, the isolation transformer 130 is used to receive the AC filter signal and isolate the electrical connection between different fuel cell operation circuits 100 in response to the AC filter signal to protect the fuel cell operation circuit 100, and the AC output bus 200 is used to receive the AC filter signal output by the fuel cell operation circuit 100, and output a power supply signal in response to the AC filter signal.

[0033] It should be noted that the fuel cell parallel operation system of the present application includes at least two fuel cell operation circuits 100. In actual operation conditions, the fuel cell group 110 in the fuel cell operation circuit 100 outputs a high-voltage DC signal, and the conversion module 120 converts the high-voltage DC signal into an AC filtered signal and outputs it to the isolation transformer 130. One end of the isolation transformer 130 is connected to the conversion module 120, and the other end is connected to the AC output bus 200. Because the output ends of all fuel cell operation circuits 100 are connected to the AC output bus 200, by setting up the isolation transformer 130 in this way, the fuel cell group 110 and other fuel cell operation circuits 100 can be effectively isolated, reducing the possibility of electrical mutual influence of the fuel cell operation circuits 100, thereby improving the safety of the fuel cell system while ensuring the output power.

[0034] Exemplarily, the fuel cell parallel operation system includes at least two fuel cell operation circuits 100, and the output ends of all fuel cell operation circuits 100 are connected to the input end of the AC output bus 200, and the AC output bus 200 converges the AC filter signals output by multiple fuel cell operation circuits 100, and outputs power supply signals to external components to power the external components. Specifically, in actual operating conditions, the number of fuel cell operation circuits 100 can be adjusted according to the output power required by the external components, and the present application solves the problem of differences in ground potential between different fuel cells by providing an isolation transformer 130 on each fuel cell operation circuit 100. More specifically, the fuel cell parallel operation system of the present application is widely used in multiple technical fields, and the external components can be the drive system of a vehicle or the drive system of a ship.

[0035] Reference Figure 1 It can be understood that the conversion module 120 includes an inverter 121, the input end of the inverter 121 is connected to the output end of the fuel cell group 110, and the inverter 121 is used to receive a high-voltage DC signal and convert the high-voltage DC signal into an AC signal for output.

[0036] It can be understood that the conversion module 120 also includes a filter 122, the input end of the filter 122 is connected to the output end of the converter 121, the output end of the filter 122 is connected to the input end of the isolation transformer 130, and the filter 122 is used to receive the AC signal and filter out the harmonic components in the AC signal to output the AC filtered signal to the isolation transformer 130.

[0037] Exemplarily, the fuel cell stack 110 outputs a high-voltage DC signal. In order to save energy and improve transmission efficiency, the present application is also provided with a converter 121, the input end of the converter 121 is connected to the output end of the fuel cell stack 110, and in the operating condition, after receiving the high-voltage DC signal, the converter 121 needs to convert the high-voltage DC signal into a frequency-stable AC power, that is, to obtain an AC signal. However, the converter 121 may generate harmonic components when converting the high-voltage DC signal into an AC signal, resulting in an unstable frequency of the output AC power. Based on this, the present application is also provided with a filter 122, the input end of the filter 122 is connected to the output end of the converter 121, and can receive the AC signal carrying harmonic components output by the converter 121, and filter out the harmonic components in the AC signal to obtain a frequency-stable AC filtered signal. Further, by setting the filter 122, the power quality of the power supply signal output by the fuel cell parallel operation system can be guaranteed.

[0038] It is understandable that the fuel cell operation circuit 100 also includes a fast fuse 140, one end of the fast fuse 140 is connected to the output end of the fuel cell group 110, and the other end of the fast fuse 140 is connected to the input end of the inverter 121. The fast fuse 140 is used for overload protection.

[0039] Exemplarily, in order to prevent the high-voltage DC signal output by the fuel cell group 110 from being too large and exceeding the actual load in the fuel cell operation circuit 100, causing the fuel cell operation circuit 100 to be damaged due to overload, the present application is also provided with a fast fuse 140, and the fast fuse 140 plays a role in line overload protection. Further, in the present application, one end of the fast fuse 140 is connected to the output end of the fuel cell group 110, and the other end of the fast fuse 140 is connected to the input end of the converter 121. When the high-voltage DC signal output by the fuel cell group 110 is too large and exceeds the actual load in the fuel cell operation circuit 100, the fuse of the fast fuse 140 will be quickly disconnected to protect the fuel cell operation circuit 100 and prevent the fuel cell operation circuit 100 from being damaged due to overload.

[0040] It can be understood that the fuel cell operation circuit 100 also includes a bus switch 150, one end of the bus switch 150 is connected to the output end of the isolation transformer 130, and the other end of the bus switch 150 is connected to the input end of the AC output bus 200. The bus switch 150 is used to open or close to control the connection between the fuel cell operation circuit 100 and the AC output bus 200.

[0041] Exemplarily, each fuel cell operation circuit 100 is provided with a bus switch 150, one end of the bus switch 150 is connected to the output end of the isolation transformer 130, and the other end is connected to the input end of the AC output bus 200, and the bus switch 150 can control the connection between the fuel cell operation circuit 100 and the AC output bus 200. Specifically, when the power of the power supply signal output by the fuel cell parallel operation system is greater than the output power required by the current external components, the bus switch 150 of the fuel cell operation circuit 100 can be disconnected to disconnect the fuel cell group 110 from the AC output bus 200, thereby reducing the power of the power supply signal output by the fuel cell parallel operation system; when the power of the power supply signal output by the fuel cell parallel operation system is less than the output power required by the current external components, the bus switch 150 of the fuel cell operation circuit 100 can be closed to connect the fuel cell group 110 to the AC output bus 200, thereby increasing the power of the power supply signal output by the fuel cell parallel operation system.

[0042] It is understandable that a voltage sampling device is also provided on the AC output bus 200, and the voltage sampling device is used to monitor the magnitude of the power supply signal in real time.

[0043] It is understandable that a load is also provided on the AC output bus 200, and the load is used to adjust the magnitude of the power supply signal.

[0044] Exemplarily, in order to monitor and adjust the size of the power supply signal output by the fuel cell parallel operation system in real time, the present application also provides a voltage sampling device and a load on the AC output bus 200. When the fuel cell parallel operation system is running, the voltage sampling device on the AC output bus 200 will monitor the size of the power supply signal in real time. When the power supply signal is too large, there may be a risk of damage to the external components connected to the AC output bus 200. When the power supply signal is too small, it may not be possible to drive the external components connected to the AC output bus 200. Further, in order to reduce the risk of damage to external components while driving external components, the voltage sampling device of the present application can also send an alarm to the controller when the power supply signal is too large or too small, so that the controller controls the load on the bus to adjust the size of the power supply signal and output a constant power supply signal.

[0045] It can be understood that the isolation transformer 130 is a surge isolation transformer.

[0046] It should be noted that a surge isolation transformer is a specially designed transformer with an insulation layer and a shielding layer between the primary and secondary windings. These shielding layers and insulation layers help reduce the common-mode surges from the primary side (appearing between the main winding and the ground) to the secondary side (appearing between the secondary winding and the ground). Compared with ordinary transformers, surge isolation transformers have enhanced rated impulse voltages.

[0047] Furthermore, the present application effectively isolates the fuel cell operating circuit 100 where the surge isolation transformer is located from other fuel cell operating circuits 100 by connecting one end of the surge isolation transformer to the filter 122 and the other end of the surge isolation transformer to the AC output bus 200, thereby reducing the possibility of electrical mutual influence, reducing the risk of system failures and accidents, and enhancing the safety of the fuel cell system.

[0048] It can be understood that the rated capacity of the isolation transformer 130 is the same as the power of the fuel cell parallel operation system.

[0049] Exemplarily, to ensure that the isolation transformer 130 can effectively achieve electrical isolation to improve the safety of the fuel cell parallel operation system, the parameters of the isolation transformer 130 of the present application will be set according to the total power of the fuel cell parallel operation system (i.e., the power of the power supply signal output by the AC output bus 200), and the rated capacity of the isolation transformer 130 will be greater than or equal to the total power of the fuel cell parallel operation system.

[0050] Furthermore, the rated voltage of the isolation transformer 130 will be consistent with the output voltage of the fuel cell parallel operation system (ie, the voltage of the power supply signal output by the AC output bus 200).

[0051] A second aspect of the present application provides a fuel cell vehicle, comprising: a vehicle frame; and a fuel cell parallel operation system as described in any one of the embodiments of the first aspect of the present application.

[0052] Exemplarily, the fuel cell parallel operation system of the present application can be applied to a fuel cell vehicle, which includes a frame and a fuel cell parallel operation system mounted on the frame. In the operating condition of the fuel cell vehicle, the fuel cell parallel operation system plays a driving role.

[0053] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A fuel cell parallel operation system, characterized in that: include: At least two fuel cell operation circuits; An AC output bus, the input end of which is connected to the output ends of all the fuel cell operation circuits; Wherein, the fuel cell operation circuit includes a fuel cell group, a conversion module and an isolation transformer connected in sequence, and the other end of the isolation transformer is connected to the input end of the AC output bus, wherein the fuel cell group is used to output a high-voltage DC signal, the conversion module is used to receive the high-voltage DC signal and convert the high-voltage DC signal into an AC filtered signal for output, the isolation transformer is used to receive the AC filtered signal and isolate the electrical connection between different fuel cell operation circuits in response to the AC filtered signal to protect the fuel cell operation circuit, and the AC output bus is used to receive the AC filtered signal output by the fuel cell operation circuit, and output a power supply signal in response to the AC filtered signal.

2. The fuel cell parallel operation system according to claim 1, characterized in that: The conversion module includes an inverter, the input end of the inverter is connected to the output end of the fuel cell group, and the inverter is used to receive the high-voltage DC signal and convert the high-voltage DC signal into an AC signal for output.

3. The fuel cell parallel operation system according to claim 2, characterized in that: The conversion module also includes a filter, the input end of the filter is connected to the output end of the converter, the output end of the filter is connected to the input end of the isolation transformer, and the filter is used to receive the AC signal and filter out the harmonic components in the AC signal to output an AC filtered signal to the isolation transformer.

4. The fuel cell parallel operation system according to claim 2, characterized in that: The fuel cell operation circuit also includes a fast fuse, one end of which is connected to the output end of the fuel cell group, and the other end of which is connected to the input end of the converter. The fast fuse is used for overload protection.

5. The fuel cell parallel operation system according to claim 1, characterized in that: The fuel cell operation circuit also includes a bus switch, one end of which is connected to the output end of the isolation transformer, and the other end of which is connected to the input end of the AC output bus. The bus switch is used to open or close to control the connection between the fuel cell operation circuit and the AC output bus.

6. The fuel cell parallel operation system according to claim 1, characterized in that: The AC output bus is also provided with a voltage sampling device, and the voltage sampling device is used to monitor the magnitude of the power supply signal in real time.

7. The fuel cell parallel operation system according to claim 6, characterized in that: The AC output busbar is also provided with a load, and the load is used to adjust the magnitude of the power supply signal.

8. The fuel cell parallel operation system according to claim 1, characterized in that: The isolation transformer is a surge isolation transformer.

9. The fuel cell parallel operation system according to claim 8, characterized in that: The rated capacity of the isolation transformer is the same as the power of the fuel cell parallel operation system.

10. A fuel cell vehicle, characterized in that: include: Frame; A fuel cell parallel operation system according to any one of claims 1 to 9.

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