Electric coupling technology circuit and method for hydrogen fuel power generation system

Abstract

The invention discloses an electric coupling technology circuit and method for a hydrogen fuel power generation system, and the circuit is characterized in that the positive electrode of a hydrogen fuel stack is connected with the positive electrode of a diode, the negative electrode of the diode is connected with the positive electrode of a power storage and load module, and the negative electrode of the hydrogen fuel stack is connected with the negative electrode of the power storage and load module; the working voltage of the hydrogen fuel stack during power generation is equal to that of the power storage and load module; and the diode is used for conducting a power supply loop of the hydrogen fuel stack to the power storage and load module when the output voltage of the hydrogen fuel stack is increased to the working voltage when the hydrogen fuel stack is started. The working voltage of the hydrogen fuel electric pile is equal to the working voltage of the electric power storage and load module, and under the condition that the output voltage of the hydrogen fuel electric pile rises to the working voltage, a power supply loop of the hydrogen fuel electric pile to the electric power storage and load module is conducted through a diode. Because the weight and the power consumption of the diode are small, the hydrogen fuel power generation system electric coupling technology circuit can be suitable for the field with high weight and power consumption requirements.

Description

Technical Field

[0001] This application relates to the technical field of power generation, and more specifically, to an electrical coupling technology circuit and method for a hydrogen fuel power generation system. Background Technology

[0002] Hydrogen fuel cell power generation systems typically include a hydrogen fuel cell stack, a DC / DC converter, and an energy storage and load module. The DC / DC converter matches the voltage between the hydrogen fuel cell stack and the energy storage and load module. However, the relatively heavy weight and high power consumption of the DC / DC converter limit the applicable fields of hydrogen fuel cell power generation systems. Summary of the Invention

[0003] In view of the above problems, this application proposes an electrical coupling technology circuit and method for hydrogen fuel power generation systems, which can effectively reduce the weight and power consumption of hydrogen fuel power generation systems, thereby increasing the applicable fields of hydrogen fuel power generation systems.

[0004] In a first aspect, embodiments of this application provide an electrical coupling technology circuit for a hydrogen fuel cell power generation system. This circuit includes: a hydrogen fuel cell stack, a diode, and a power storage and load module. The positive terminal of the hydrogen fuel cell stack is connected to the positive terminal of the diode, the negative terminal of the diode is connected to the positive terminal of the power storage and load module, and the negative terminal of the hydrogen fuel cell stack is connected to the negative terminal of the power storage and load module. The operating voltage of the hydrogen fuel cell stack during power generation is equal to that of the power storage and load module. The diode is used to conduct the power supply circuit from the hydrogen fuel cell stack to the power storage and load module when the output voltage of the hydrogen fuel cell stack rises to the operating voltage during startup.

[0005] Secondly, embodiments of this application provide an electrical coupling method for a hydrogen fuel cell power generation system, comprising: determining the operating voltage range of a power storage and load module; and determining a hydrogen fuel cell stack corresponding to the operating voltage range, so that the operating voltage range of the hydrogen fuel cell stack and the power storage and load module are the same.

[0006] The technical solution provided in this application includes an electrical coupling circuit for a hydrogen fuel cell power generation system comprising: a hydrogen fuel cell stack, a diode, and a power storage and load module. The positive terminal of the hydrogen fuel cell stack is connected to the positive terminal of the diode, the negative terminal of the diode is connected to the positive terminal of the power storage and load module, and the negative terminal of the hydrogen fuel cell stack is connected to the negative terminal of the power storage and load module. During operation, the operating voltage of the hydrogen fuel cell stack and the power storage and load module are equal. The diode is used to conduct the power supply circuit from the hydrogen fuel cell stack to the power storage and load module when the output voltage of the hydrogen fuel cell stack rises to the operating voltage. Therefore, the operating voltage of the hydrogen fuel cell stack and the operating voltage of the power storage and load module are equal, and the power supply circuit from the hydrogen fuel cell stack to the power storage and load module is only conducted through the diode when the output voltage of the hydrogen fuel cell stack rises to the operating voltage. This eliminates the need for a DC / DC converter to adjust the voltages of the hydrogen fuel cell stack and the power storage and load module, ensuring normal power supply from the hydrogen fuel cell stack to the power storage and load module. Compared to the DC / DC converter used in existing technologies, the smaller weight and power consumption of diodes effectively increase the applicability of electrical coupling technology circuits in hydrogen fuel power generation systems (e.g., applications in the aerospace field, and applications requiring lightweight design, such as drones). Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments and drawings obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0008] Figure 1 A schematic diagram of the electrical coupling technology circuit of a hydrogen fuel power generation system according to an embodiment of this application is shown.

[0009] Figure 2 A schematic diagram of the electrical coupling technology circuit of another hydrogen fuel power generation system according to an embodiment of this application is shown.

[0010] Figure 3 A schematic diagram of the electrical coupling technology circuit of another hydrogen fuel power generation system involved in the embodiments of this application is shown.

[0011] Figure 4 A schematic diagram of a hydrogen fuel power generation system provided in an embodiment of this application is shown. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] In the following description, references to "some embodiments" describe a subset of all possible embodiments; however, it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict. In the following description, the term "a plurality of" means at least two.

[0014] In the following description, the terms "first" and "second" are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first" and "second" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0016] Hydrogen fuel cell power generation systems typically include a hydrogen fuel cell stack, a DC / DC converter, and an energy storage and load module. The DC / DC converter matches the voltage between the hydrogen fuel cell stack and the energy storage and load module. However, the DC / DC converter is heavy and consumes a lot of power, which limits the application areas of hydrogen fuel cell power generation systems.

[0017] To address the aforementioned issues, this application provides an electrical coupling technology circuit and method for a hydrogen fuel cell power generation system. The electrical coupling technology circuit includes: a hydrogen fuel cell stack, a diode, and a power storage and load module. The positive terminal of the hydrogen fuel cell stack is connected to the positive terminal of the diode, the negative terminal of the diode is connected to the positive terminal of the power storage and load module, and the negative terminal of the hydrogen fuel cell stack is connected to the negative terminal of the power storage and load module. The operating voltage of the hydrogen fuel cell stack during power generation is equal to that of the power storage and load module. The diode is used to conduct the power supply circuit from the hydrogen fuel cell stack to the power storage and load module when the output voltage of the hydrogen fuel cell stack rises to the operating voltage during startup.

[0018] Therefore, the operating voltage of the hydrogen fuel cell stack is equal to that of the power storage and load module. The power supply circuit from the hydrogen fuel cell stack to the power storage and load module only conducts through the diode when the output voltage of the hydrogen fuel cell stack rises to the operating voltage. This eliminates the need for a DC / DC converter to adjust the voltages of both the hydrogen fuel cell stack and the power storage and load module, ensuring normal power supply from the hydrogen fuel cell stack to the power storage and load module. Compared to existing DC / DC converters, the diode's smaller weight and lower power consumption significantly expand the applicability of the hydrogen fuel cell power generation system's electrical coupling technology circuit (e.g., applications in the aerospace field and lightweight applications such as drones). In other words, the hydrogen fuel cell power generation system's electrical coupling technology circuit can be used in applications with high weight and power consumption requirements, such as drones.

[0019] Please see Figure 1 , Figure 1 This application illustrates a schematic diagram of the electrical coupling technology circuit of a hydrogen fuel cell power generation system according to an embodiment of the present application. Figure 1 As shown, the electrocoupling technology circuit 100 of the hydrogen fuel cell power generation system includes a hydrogen fuel cell stack 110, a diode 120, and a power storage and load module 130. The positive terminal of the hydrogen fuel cell stack 110 is connected to the positive terminal of the diode 120, the negative terminal of the diode 120 is connected to the positive terminal of the power storage and load module 130, and the negative terminal of the hydrogen fuel cell stack 110 is connected to the negative terminal of the power storage and load module 130.

[0020] The hydrogen fuel cell stack 110 operates at the same voltage range as the power storage and load module 130 when it is generating electricity. The diode 120 is used to turn on the power supply circuit from the hydrogen fuel cell stack 110 to the power storage and load module 130 when the output voltage of the hydrogen fuel cell stack 110 rises to the operating voltage during startup.

[0021] In some embodiments, the power storage and load module 130 may be one or more electrical appliances. In some embodiments, the power storage and load module 130 may be one or more lithium batteries. In the embodiments of this application, the power storage and load module 130 may be one or more electrical appliances and lithium batteries.

[0022] This application sets the operating voltage of the hydrogen fuel cell stack 110 when it is generating electricity to be equal to the operating voltage of the power storage and load module 130. When the hydrogen fuel cell stack 110 starts to work, its output voltage will gradually increase. When the output voltage of the hydrogen fuel cell stack 110 rises to the operating voltage, the diode 120 reaches the conduction voltage and switches from the off state to the on state, thereby opening the power supply circuit from the hydrogen fuel cell stack 110 to the power storage and load module 130.

[0023] In other words, this application sets the operating voltage of the hydrogen fuel cell stack 110 when it is generating electricity to be equal to the operating voltage of the power storage and load module 130, and selects the forward voltage of the diode 120 as the operating voltage. This avoids the need for the hydrogen fuel cell power generation system's electrical coupling technology circuit 100 to use a DC / DC converter to adjust the unequal operating voltages of the hydrogen fuel cell stack 110 and the power storage and load module 130. That is, it requires a DC / DC converter to convert the operating voltage of the hydrogen fuel cell stack 110 to the operating voltage required by the power storage and load module 130.

[0024] Because the diode 120 has relatively small weight and power consumption, the weight and power consumption of the hydrogen fuel power generation system electrical coupling technology circuit 100 in this application are relatively reduced, so that the hydrogen fuel power generation system electrical coupling technology circuit 100 can be used in some fields with high weight requirements and / or high power requirements.

[0025] Further, please refer to Figure 2 , Figure 2 A schematic diagram of the electrical coupling technology circuit of another hydrogen fuel cell power generation system according to an embodiment of this application is shown. Figure 2 As shown, the electrical coupling technology circuit 100 of the hydrogen fuel power generation system also includes a switch S and a discharge resistor R. The two ends of the switch S are respectively connected to the positive terminal of the hydrogen fuel cell stack 110 and one end of the discharge resistor R, and the other end of the discharge resistor R is connected to the negative terminal of the hydrogen fuel cell stack 110.

[0026] When the hydrogen fuel cell stack 110 is not in operation, since it has no output power and its voltage is lower than that of the power storage and load module, diode 120 is cut off and does not conduct, thus disconnecting the power supply circuit from the hydrogen fuel cell stack 110 to the power storage and load module 130. In this situation, to allow the hydrogen fuel cell stack 110 to discharge normally, switch S is turned on, connecting a discharge resistor R between the positive and negative terminals of the hydrogen fuel cell stack 110, thereby discharging the electricity from the hydrogen fuel cell stack 110 through the discharge circuit R.

[0027] Furthermore, since diode 120 can only conduct in one direction, the power storage and load module 130 cannot supply power to the hydrogen fuel cell stack 110, thereby improving the safety of the electrical coupling technology circuit 100 of the hydrogen fuel power generation system.

[0028] In some embodiments, the hydrogen fuel cell stack is equipped with a controller (not shown in the figure). When the hydrogen fuel cell stack stops generating electricity, the diode is in the off state, and the controller is used to control the switch to be in the closed state so as to discharge the hydrogen fuel cell stack through the discharge resistor, thereby improving the safety of the use of the electrical coupling technology circuit 100 of the hydrogen fuel power generation system.

[0029] In some implementation methods, please refer to Figure 3 , Figure 3 This illustration shows a schematic diagram of the electrical coupling technology circuit of another hydrogen fuel cell power generation system according to an embodiment of this application. Figure 3 As shown, the power storage and load module 130 includes a lithium battery pack 131 and a load 132. The positive terminals of the lithium battery pack 131 and the load 132 are respectively connected to the negative terminal of the diode 120, and the negative terminals of the lithium battery pack 130 and the load 132 are respectively connected to the negative terminal of the hydrogen fuel cell stack 110.

[0030] In some embodiments, the lithium battery pack 131 includes a plurality of lithium batteries, with different lithium batteries connected in parallel.

[0031] The diode 120 is used to disconnect the power supply circuit from the hydrogen fuel cell stack 110 to the power storage and load module 130 when the hydrogen fuel cell stack 110 is in an inactive state, so as to prevent the lithium battery pack 131 from supplying power to the hydrogen fuel cell stack 110.

[0032] In some implementations, load 132 can be an electrical appliance.

[0033] When the hydrogen fuel cell stack 110 is not in operation, since it has no output power and its voltage is lower than that of the power storage and load module, diode 120 is cut off and does not conduct, thus disconnecting the power supply circuit from the hydrogen fuel cell stack 110 to the power storage and load module 130. In this situation, since the positive terminal of the lithium battery pack 131 is connected to the positive terminal of the load 132, and the negative terminal of the lithium battery pack 131 is connected to the negative terminal of the load 132, power can be supplied to the load 132 through the lithium battery pack 131, ensuring that the load 132 can still operate normally even when the hydrogen fuel cell stack 110 is not in operation.

[0034] In some implementations, the diode is also used when the hydrogen fuel cell stack is in operation, the inductive load generates a back electromotive force, which charges the lithium battery pack; when the voltage at the power consumption terminal (the voltage generated by the inductive load) is higher than the voltage of the hydrogen fuel cell stack, the diode is turned off, disconnecting the power supply circuit from the hydrogen fuel cell stack to the power storage and load module, so as to prevent the power consumption terminal from supplying reverse power to the hydrogen fuel cell stack; when the voltage of the hydrogen fuel cell stack rises to a level higher than the voltage at the power consumption terminal, the diode is turned on, and the hydrogen fuel cell stack supplies power to the power consumption module (lithium battery pack and load).

[0035] Because inductive loads generate high reverse electromotive force and diodes have high reverse withstand voltage, the reverse cutoff of the diodes prevents the power supply terminal from supplying reverse power to the hydrogen fuel cell stack, thereby improving the safety of the electrical coupling technology circuit 100 of the hydrogen fuel power generation system.

[0036] Please see Figure 4 , Figure 4 A schematic diagram of a hydrogen fuel cell power generation system provided in an embodiment of this application is shown, as follows: Figure 4 As shown, the hydrogen fuel power generation system 200 may include the aforementioned hydrogen fuel power generation system electrical coupling technology circuit 100.

[0037] The hydrogen fuel cell power generation system electrical coupling technology circuit 100 includes a hydrogen fuel cell stack, a diode, and a power storage and load module. The positive terminal of the hydrogen fuel cell stack is connected to the positive terminal of the diode, the negative terminal of the diode is connected to the positive terminal of the power storage and load module, and the negative terminal of the hydrogen fuel cell stack is connected to the negative terminal of the power storage and load module.

[0038] When the output voltage of the hydrogen fuel cell stack rises to the operating voltage, the power supply circuit from the hydrogen fuel cell stack to the power storage and load module is turned on through the diode.

[0039] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the electrical coupling technology circuit 100 of the hydrogen fuel power generation system can be referred to the corresponding process in the foregoing embodiments, and will not be repeated here.

[0040] This application provides an embodiment of an electrical coupling technology method for a hydrogen fuel cell power generation system, which can be applied to the aforementioned electrical coupling technology circuit of a hydrogen fuel cell power generation system. The electrical coupling technology method for a hydrogen fuel cell power generation system may include the following steps: (1) Determine the operating voltage range of the power storage and load modules; (2) Determine the hydrogen fuel cell stack corresponding to the operating voltage range so that the operating voltage range of the hydrogen fuel cell stack is the same as that of the power storage and load module.

[0041] This application sets the operating voltage of the hydrogen fuel cell stack to be equal to the operating voltage of the power storage and load module. When the hydrogen fuel cell stack starts to work, the output voltage of the hydrogen fuel cell stack will slowly rise. When the output voltage of the hydrogen fuel cell stack rises to the operating voltage, it reaches the forward voltage of the diode. The diode switches from the off state to the on state, thereby opening the power supply circuit from the hydrogen fuel cell stack to the power storage and load module.

[0042] By setting the operating voltage of the hydrogen fuel cell stack to be equal to the operating voltage of the power storage and load module, and by adding diodes to avoid the need for a DC / DC converter between the hydrogen fuel cell stack and the power storage and load module in the electrical coupling technology circuit of the hydrogen fuel power generation system, the operating voltage of the hydrogen fuel cell stack can be converted into the operating voltage required by the power storage and load module through the DC / DC converter, so as to ensure that the hydrogen fuel cell stack can supply power to the power storage and load module normally.

[0043] Because diodes have relatively low weight and power consumption, the weight and power consumption of the electrical coupling technology circuit for the hydrogen fuel cell power generation system in this application are also reduced, allowing it to be used in fields with high weight and / or high power requirements. For example, the electrical coupling technology circuit for the hydrogen fuel cell power generation system can be used in the aerospace field.

[0044] In some embodiments, the electric coupling technology method of the hydrogen fuel power generation system may further include: supplying power to the load through a lithium battery pack when the hydrogen fuel cell stack stops generating electricity.

[0045] In some embodiments, the electrocoupling technology method of the hydrogen fuel power generation system may further include: when the hydrogen fuel cell stack stops generating electricity, a control switch is closed to discharge the hydrogen fuel cell stack through a discharge resistor.

[0046] When the hydrogen fuel cell stack is not generating electricity, the diode is cut off and does not conduct, thus disconnecting the power supply circuit from the hydrogen fuel cell stack to the power storage and load module. In this situation, in order for the hydrogen fuel cell stack to discharge normally, the switch is turned on to connect a discharge resistor between the positive and negative terminals of the hydrogen fuel cell stack, thereby allowing the hydrogen fuel cell stack to discharge through the discharge resistor circuit.

[0047] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the electrical coupling technology circuit 100 of the hydrogen fuel power generation system can be referred to the corresponding process in the foregoing embodiments, and will not be repeated here.

[0048] This application provides an electrical coupling technology circuit and method for a hydrogen fuel cell power generation system. The electrical coupling technology circuit includes: a hydrogen fuel cell stack, a diode, and a power storage and load module. The positive terminal of the hydrogen fuel cell stack is connected to the positive terminal of the diode, the negative terminal of the diode is connected to the positive terminal of the power storage and load module, and the negative terminal of the hydrogen fuel cell stack is connected to the negative terminal of the power storage and load module. The operating voltage of the hydrogen fuel cell stack during power generation is equal to that of the power storage and load module. The diode is used to conduct the power supply circuit from the hydrogen fuel cell stack to the power storage and load module when the output voltage of the hydrogen fuel cell stack rises to the operating voltage during startup.

[0049] Therefore, the operating voltage of the hydrogen fuel cell stack is equal to that of the power storage and load module. Furthermore, the power supply circuit from the hydrogen fuel cell stack to the power storage and load module only conducts through the diode when the output voltage of the hydrogen fuel cell stack rises to the operating voltage. This eliminates the need for a DC / DC converter (e.g., a DC-DC converter) to adjust the voltages of both the hydrogen fuel cell stack and the power storage and load module, ensuring normal power supply from the hydrogen fuel cell stack to the power storage and load module. Compared to DC / DC converters, diodes are lighter and consume less power, effectively expanding the applicability of the hydrogen fuel cell power generation system's electrical coupling technology circuit (e.g., in the aerospace field).

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An electrical coupling technology circuit for a hydrogen fuel cell power generation system, characterized in that, include: A hydrogen fuel cell stack, a diode, and a power storage and load module are provided. The positive terminal of the hydrogen fuel cell stack is connected to the positive terminal of the diode, the negative terminal of the diode is connected to the positive terminal of the power storage and load module, and the negative terminal of the hydrogen fuel cell stack is connected to the negative terminal of the power storage and load module. The operating voltage of the hydrogen fuel cell stack during power generation is equal to that of the power storage and load module. The diode is used to turn on the power supply circuit from the hydrogen fuel cell stack to the power storage and load module when the output voltage rises to the operating voltage during startup.

2. The electrical coupling technology circuit for a hydrogen fuel cell power generation system according to claim 1, characterized in that, The power storage and load module includes a lithium battery pack and a load. The positive terminal of the lithium battery pack and the positive terminal of the load are respectively connected to the negative terminal of the diode, and the negative terminal of the lithium battery pack and the negative terminal of the load are respectively connected to the negative terminal of the hydrogen fuel cell stack. The diode is used to disconnect the power supply circuit from the hydrogen fuel cell stack to the power storage and load module when the hydrogen fuel cell stack is in an inactive state, so as to prevent the lithium battery pack from supplying reverse power to the hydrogen fuel cell stack.

3. The electrical coupling technology circuit for a hydrogen fuel cell power generation system according to claim 1, characterized in that, The power storage and load module includes a lithium battery pack and a load. The positive terminal of the lithium battery pack and the positive terminal of the load are respectively connected to the negative terminal of the diode, and the negative terminal of the lithium battery pack and the negative terminal of the load are respectively connected to the negative terminal of the hydrogen fuel cell stack. The diode is used to: when the hydrogen fuel cell stack is in operation, the inductive load generates a reverse electromotive force, which charges the lithium battery pack; when the voltage at the power consumption terminal is higher than the voltage of the hydrogen fuel cell stack, the diode is turned off, disconnecting the power supply circuit from the hydrogen fuel cell stack to the power storage and load module, thus preventing the power consumption terminal from supplying reverse power to the hydrogen fuel cell stack; when the voltage of the hydrogen fuel cell stack rises to a level higher than the voltage at the power consumption terminal, the diode is turned on, and the hydrogen fuel cell stack supplies power to the power consumption module.

4. The electrical coupling technology circuit for a hydrogen fuel cell power generation system according to claim 1, characterized in that, The electrocoupling technology circuit of the hydrogen fuel power generation system also includes a switch and a discharge resistor. The two ends of the switch are respectively connected to the positive terminal of the hydrogen fuel cell stack and one end of the discharge resistor, and the other end of the discharge resistor is connected to the negative terminal of the hydrogen fuel cell stack.

5. The electrical coupling technology circuit for a hydrogen fuel cell power generation system according to claim 4, characterized in that, The hydrogen fuel cell stack is equipped with a controller. When the hydrogen fuel cell stack stops generating electricity, the diode is in the off state. The controller is used to control the switch to be in the closed state so as to discharge the hydrogen fuel cell stack through the discharge resistor.

6. An electrical coupling technology method for a hydrogen fuel power generation system, characterized in that, The method includes: Determine the operating voltage range of the power storage and load modules; Determine the hydrogen fuel cell stack corresponding to the operating voltage range so that the operating voltage range of the hydrogen fuel cell stack is the same as that of the power storage and load module.

7. The electrocoupling technology method for a hydrogen fuel cell power generation system according to claim 6, characterized in that, The method further includes: When the hydrogen fuel cell stack stops generating electricity, the load is powered by a lithium battery pack.

8. The electrocoupling technology method for a hydrogen fuel cell power generation system according to claim 6, characterized in that, When the hydrogen fuel cell stack stops generating electricity, the control switch is closed to discharge the hydrogen fuel cell stack through the discharge resistor.

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