CN107994643B - Fuel cell power supply and battery power supply system - Google Patents

Abstract

The invention relates to a fuel cell power supply and a battery power supply system, and belongs to the technical field of electricity. The fuel cell power is applied to a battery power system, and the battery power system further comprises: a hydrogen system, the hydrogen system comprising: the hydrogen production unit and the hydrogen storage unit are connected with the hydrogen production unit through pipelines. The fuel cell power supply includes: the power supply system comprises a fuel cell power supply module, a first inverter, a second inverter, an auxiliary power source and a converter. The fuel cell power supply module is connected with the first inverter, the first inverter is connected with the second inverter and the converter respectively, the auxiliary power supply is connected with the second inverter, the converter is also connected with the fuel cell power supply module and the second inverter respectively, the fuel cell power supply is also used for being connected with the hydrogen storage unit, and the first inverter and the second inverter are both also used for being connected with the power supply grid. The fuel cell power supply is used for converting fuel provided by the hydrogen system into 380V alternating current for an external load, and can continuously provide emergency power for the load for a long time.

Description

A fuel cell power supply and battery power supply system

Technical Field

The present invention belongs to the field of electrical technology, and in particular relates to a fuel cell power supply and a battery power supply system.

Background technique

Backup power supplies are mainly used to provide the required emergency power to necessary loads in the event of an accident in the power grid, thereby effectively reducing the losses caused by power outages. Commonly used backup power supplies, such as lithium batteries, nickel-metal hydride batteries, lead-acid batteries, etc., have limited battery capacity, resulting in short continuous power supply time, and they also cause environmental pollution. For example, the components of lead-acid batteries can pollute the environment and cause harm to the human body.

Summary of the invention

In view of this, an object of the present invention is to provide a fuel cell power supply and a battery power supply system to effectively improve the above-mentioned problems.

The embodiment of the present invention is achieved as follows:

The embodiment of the present invention provides a fuel cell power supply, which is applied to a battery power supply system, wherein the battery power supply system further includes: a hydrogen system, wherein the hydrogen system includes: a hydrogen production unit and a hydrogen storage unit connected to the hydrogen production unit through a pipeline. The fuel cell power supply includes: a fuel cell power supply module, a first inverter, a second inverter, an auxiliary power supply and a converter. The fuel cell power supply module is connected to the first inverter, the first inverter is connected to the second inverter and the converter respectively, the auxiliary power supply is connected to the second inverter, the converter is also connected to the fuel cell power supply module and the second inverter respectively, the fuel cell power supply is also used to connect to the hydrogen storage unit, and the first inverter and the second inverter are also used to connect to the power supply grid. The first inverter is used to convert the power output by the fuel cell power supply module into 380V AC power and output it to the power supply grid to power the load. The second inverter is used to convert the 380V AC power output by the first inverter into DC power to charge the auxiliary power supply; and to invert the DC power output by the auxiliary power supply into 380V AC power and output it to the power supply grid to power the load. The converter is used to convert the AC power output by the first inverter or the second inverter into DC power and output it to the fuel cell power supply module. The fuel cell power supply module is used to convert the fuel output by the hydrogen storage unit into electrical energy and output it to the first inverter.

In an optional embodiment of the present invention, the fuel cell power supply also includes: a radiator, the radiator including: a return water pipeline and a water outlet pipeline, the return water pipeline and the water outlet pipeline are both connected to the fuel cell power supply module through a pipeline, the radiator is used to provide coolant to the fuel cell power supply module, and dissipate heat for the fuel cell power supply module; and the return water pipeline and the water outlet pipeline are also used to be connected to the hydrogen production unit through a pipeline, and the radiator is also used to provide coolant to the hydrogen storage unit, and dissipate heat for the hydrogen storage unit.

In an optional embodiment of the present invention, the fuel cell power supply module includes: a fuel cell case and an electrical unit, a fuel cell stack, a humidification unit and a supply integrated unit arranged in the fuel cell case, the supply integrated unit is respectively connected to the humidification unit and the fuel cell stack through pipelines, the humidification unit is connected to the fuel cell stack through pipelines, and the electrical unit is respectively electrically connected to the fuel cell stack and the supply integrated unit; the humidification unit is used to provide the required humidified air for the fuel cell stack; the supply integrated unit is used to supply air to the humidification unit; and is also used to provide the fuel cell stack with the fuel required for power generation; and is also used to provide the fuel cell stack with coolant to achieve cooling of the fuel cell stack.

In an optional embodiment of the present invention, the supply integrated unit includes: an air supply unit, the air supply unit includes: a filter and a blower, the filter is connected to the blower through a pipeline, the blower is connected to the humidification unit through a pipeline, and the blower is used to pressurize the air filtered by the filter and deliver it to the humidification unit.

In an optional embodiment of the present invention, the supply integrated unit further includes: a fuel supply unit, the fuel supply unit including: a first pipeline, one end of the first pipeline is used to connect to the hydrogen storage unit, the other end of the first pipeline is connected to the fuel cell stack, and the first pipeline is provided with a hydrogen pressure reducing valve, a solenoid valve and a one-way valve. In an optional embodiment of the present invention, the fuel supply unit further includes: a second pipeline, one end of the second pipeline is used to connect to the nitrogen storage unit, the other end of the second pipeline is connected to the other end of the first pipeline, and the second pipeline is provided with a solenoid valve and a one-way valve.

In an optional embodiment of the present invention, the supply integrated unit also includes: a coolant supply unit, the coolant supply unit includes: an electronic water pump, the water outlet end of the electronic water pump is connected to the fuel cell stack through a pipeline, the water outlet of the fuel cell stack is connected to the return water of the radiator through a pipeline, and the water outlet pipeline of the radiator is connected to the water inlet end of the electronic water pump; the electronic water pump is used to adjust the flow rate of the coolant for cooling the fuel cell stack.

In an optional embodiment of the present invention, the electrical unit includes: an inspection unit, a controller, a detection sensor, a relay and a wireless transmission module, the controller is respectively connected to the inspection unit, the detection sensor, the wireless transmission module and the relay, the inspection unit is used to detect the working voltage of each single cell in the fuel cell stack, and transmit the detected voltage information to the controller; the relay is arranged on the output power line of the fuel cell stack to ensure electrical isolation; the detection sensor is used to detect the current and voltage on the output power line of the fuel cell stack, and monitor the working status of the fuel cell stack.

In an optional embodiment of the present invention, the fuel cell power supply further includes: a monitoring terminal, which is coupled to the wireless transmission module and is used to communicate with the controller.

An embodiment of the present invention also provides a battery power system, comprising: a hydrogen system and the above-mentioned fuel cell power supply; the hydrogen system comprises: a hydrogen production unit and a hydrogen storage unit connected to the hydrogen production unit through a pipeline, and the hydrogen storage unit is connected to the fuel cell power supply through a pipeline to provide the fuel required for power generation to the fuel cell power supply.

The fuel cell power supply and battery power supply system provided in the embodiment of the present invention, the fuel cell power supply is applied to the battery power supply system, the battery power supply system also includes: a hydrogen system, the hydrogen system includes: a hydrogen production unit and a hydrogen storage unit connected to the hydrogen production unit through a pipeline. The fuel cell power supply includes: a fuel cell power supply module, a first inverter, a second inverter, an auxiliary power supply and a converter. The fuel cell power supply is used to convert the fuel provided by the hydrogen system into 380V AC power for external loads, and can provide emergency power for the load continuously for a long time. Further, when the fuel cell power supply is started to supply power to the load in an emergency, the voltage output by the auxiliary power supply is converted into 380V AC power by the second inverter to supply power to the load, and the power output by the auxiliary power supply is converted into DC power by the second inverter and converter to supply power to the fuel cell power supply module, so that the fuel cell of the fuel cell power supply module is powered on to start generating electricity. After the fuel cell power supply module generates electricity normally, the power output by the fuel cell power supply module is converted into 380V AC power by the first inverter to supply power to the load, and the second inverter is also used to convert the 380V AC power output by the first inverter into DC power to charge the auxiliary power supply. At this time, the auxiliary power supply stops supplying power and is in a charging state, and the power required for the fuel cell power supply module to maintain normal operation is provided by the first inverter and converter, so as to save costs to the greatest extent. In addition, the fuel cell power supply also has the advantages of simple structure, high power generation efficiency, high reliability, and low operating cost.

Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. As shown in the accompanying drawings, the above and other purposes, features and advantages of the present invention will be clearer. The same reference numerals in all the drawings indicate the same parts. The drawings are not deliberately scaled to the actual size, and the focus is on illustrating the main purpose of the present invention.

FIG1 shows a schematic structural diagram of a fuel cell power supply provided by an embodiment of the present invention.

FIG2 shows a schematic structural diagram of a fuel cell power supply module provided in an embodiment of the present invention.

FIG. 3 shows a module schematic diagram of an electrical unit provided in an embodiment of the present invention.

FIG. 4 shows a schematic structural diagram of a fuel supply unit provided in an embodiment of the present invention.

FIG5 shows a schematic structural diagram of a battery power system provided by an embodiment of the present invention.

Icons: 10 - fuel cell power supply; 11 - fuel cell power supply module; 111 - fuel cell box; 112 - supply integrated unit; 1121 - first pipeline; 1122 - second pipeline; 1123 - hydrogen pressure reducing valve; 1124 - solenoid valve; 1125 - check valve; 113 - humidification unit; 114 - fuel cell stack; 115 - electrical unit; 1151 - inspection unit; 1152 - controller; 1153 - detection sensor; 1154 - relay; 1155 - wireless transmission module; 12 - first inverter; 13 - second inverter; 14 - auxiliary power supply; 15 - converter; 16 - radiator; 17 - monitoring terminal; 20 - battery power system; 21 - hydrogen system; 211 - hydrogen production unit; 212 - hydrogen storage unit.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

First embodiment

As shown in Figure 1, an embodiment of the present invention provides a fuel cell power supply 10 applied to a battery power supply system, and the battery power supply system also includes: a hydrogen system, and the hydrogen system includes: a hydrogen production unit and a hydrogen storage unit connected to the hydrogen production unit by a pipeline. The hydrogen system is used to provide the fuel required for the fuel cell power supply 10 to generate electricity. The fuel cell power supply 10 is used to convert the fuel provided by the hydrogen system into electrical output. In this embodiment, the fuel cell power supply 10 is a proton exchange membrane fuel cell (Proton Exchange Membrane Fuel Cell, PEMFC). The fuel cell power supply 10 includes: a fuel cell power supply module 11, a first inverter 12, a second inverter 13, an auxiliary power supply 14, a converter 15 and a radiator 16.

The fuel cell power supply module 11 is connected to the first inverter 12 and the converter 15 respectively, and is also connected to the hydrogen storage unit. The fuel cell power supply module 11 is used to convert the hydrogen fuel provided by the hydrogen storage unit into electrical energy output. Further, as shown in Figure 2, the fuel cell power supply module 11 includes: a fuel cell housing 111 and an electrical unit 115, a fuel cell stack 114, a humidification unit 113 and a supply integrated unit 112 arranged in the fuel cell housing 111. Among them, as an optional embodiment, the fuel cell housing 111 is sequentially installed with a supply integrated unit 112, a humidification unit 113, a fuel cell stack 114 and an electrical unit 115 from bottom to top. These parts are designed based on the modular design concept, which can ensure the convenience of installation and the portability of the module. During installation, they are installed layer by layer without interfering with each other. In particular, the electrical unit 115 is arranged on the top of the fuel cell housing 111 for easy debugging. In addition, the fuel cell stack 114 and the electrical unit 115 are insulated from each other by insulating members to achieve electrical isolation.

Among them, as an optional embodiment, the fuel cell box 111 is a rectangular structure, which is composed of sheet metal parts, and the thickness of the steel plate is 1.0 to 2.5 mm. The fuel cell box 111 includes: a rectangular frame, a top surface, a bottom surface, a front surface, a back surface, a left side surface and a right side surface. For the convenience of installation and debugging, optionally, the front surface, the left side surface, the right side surface and the top surface are all detachable. In order to facilitate movement, the bottom of the fuel cell box 111 is also provided with a support foot and a roller arranged in the support foot, wherein the support foot has electrical insulation, so that the fuel cell stack 114 is insulated from the installation point, improving safety. Among them, in order to extend the service life of the fuel cell box 111 and reduce the maintenance cost, the sheet metal is also sprayed with anti-corrosion paint. Among them, it can be understood that the fuel cell box 111 can also be made of other materials, for example, aluminum, aluminum alloy and other materials, so the above-mentioned materials cannot be understood as limitations of the present invention.

The supply integrated unit 112 is connected to the humidification unit 113 and the fuel cell stack 114 through pipelines, and is used to supply air to the humidification unit 113; and is also used to provide the fuel cell stack 114 with fuel required for power generation; and is also used to provide the fuel cell stack 114 with coolant to achieve cooling of the fuel cell stack 114. Further, the supply integrated unit 112 includes: an air supply unit, a fuel supply unit, and a coolant supply unit (not shown in the figure).

The air supply unit is used to supply air to the humidification unit 113, so that the humidification unit 113 converts the dry air delivered by the air supply unit into humidified air and delivers it to the fuel cell stack 114. The air supply unit includes: a filter and a blower, the filter is connected to the blower through a pipeline, the blower is connected to the humidification unit 113 through a pipeline, and the blower is used to pressurize the air filtered by the filter and deliver it to the humidification unit 113.

The fuel supply unit is used to provide the fuel required for power generation for the fuel cell stack 114. As shown in FIG3, the fuel supply unit includes: a first pipeline 1121. One end of the first pipeline 1121 is used to connect to the hydrogen storage unit, and the other end of the first pipeline 1121 is connected to the fuel cell stack 114. The first pipeline 1121 is provided with a hydrogen pressure reducing valve 1123, a solenoid valve 1124 and a one-way valve 1125. The first pipeline 1121 is used as a hydrogen supply pipeline. Since the hydrogen stored in the hydrogen storage unit is a compressed gas, it needs to be depressurized during transportation. The hydrogen pressure reducing valve 1123 can reduce the high-pressure hydrogen from the hydrogen storage unit to a low-pressure hydrogen of 0.7 bar for use by the fuel cell stack 114. In addition, a pressure gauge can be provided on the first pipeline 1121 to detect the pressure of the hydrogen in the current pipeline.

Among them, as an optional embodiment, as shown in FIG3, the fuel supply unit further includes: a second pipeline 1122. One end of the second pipeline 1122 is used to connect to the nitrogen storage unit, and the other end of the second pipeline 1122 is connected to the other end of the first pipeline 1121. The second pipeline 1122 is provided with a solenoid valve 1124 and a one-way valve 1125. The second pipeline 1122 is used as a nitrogen purge pipeline to ensure the durability of the fuel cell power supply module 11. Further, when a hydrogen source is needed, the second pipeline 1122 does not transport nitrogen. The nitrogen purge work is started only after the hydrogen source provides supply, that is, the hydrogen entering the stack stops, to ensure that the hydrogen source and the nitrogen source are always isolated, so as to clean up the residual hydrogen in the first pipeline 1121, so as to ensure the durability of the fuel cell power supply module 11. In addition, a pressure gauge can also be provided on the second pipeline 1122 to detect the pressure of the nitrogen in the current pipeline.

The coolant supply unit is used to provide coolant for the fuel cell stack 114 to cool the fuel cell stack 114 so that it can work in a suitable temperature range. Further, the coolant supply unit includes: an electronic water pump, the water outlet of the electronic water pump is connected to the fuel cell stack 114 through a pipeline, the water outlet of the fuel cell stack 114 is connected to the return water of the radiator 16 through a pipeline, and the water outlet pipeline of the radiator 16 is connected to the water inlet of the electronic water pump. The electronic water pump is used to adjust the flow of the coolant for cooling the fuel cell stack 114.

Among them, the radiator 16 is used to provide coolant for the fuel cell stack 114 in the fuel cell power supply module 11. Furthermore, the radiator 16 cools the fuel cell stack 114 based on water cooling (deionized water). In order to save costs as much as possible, preferably, the fuel cell power supply module 11 and the hydrogen system share a radiator 16, that is, the return water pipeline and the outlet water pipeline of the radiator 16 are also used to be connected to the hydrogen storage unit through pipelines. The radiator 16 is also used to provide coolant for the hydrogen storage unit to dissipate heat for the hydrogen storage unit. When the fuel cell power supply module 11 is not running or is running at a low load, the radiator 16 can cool the hydrogen storage unit. When the fuel cell power supply module 11 starts running, the radiator 16 is mainly used to dissipate heat for the fuel cell power supply module 11. In other words, the fuel cell power supply module 11 and the hydrogen storage unit are cooled at intervals, that is, when the fuel cell power supply module 11 is running, the radiator 16 is mainly used to dissipate heat for the fuel cell power supply module 11. When the fuel cell power supply module 11 is not running or is running at a low load, the radiator 16 can cool the hydrogen storage unit, so as to better utilize the radiator 16 and give full play to the heat dissipation efficiency of the radiator 16. In other words, when the power grid is normal, the hydrogen system starts to run, and the fuel cell power supply 10 is not started. At this time, the radiator 16 is used to dissipate heat for the hydrogen system; when the power grid is abnormal and a backup power supply is needed, the fuel cell power supply 10 starts to run and converts the fuel previously generated by the hydrogen system into electrical energy output. At this time, the radiator 16 is used to dissipate heat for the fuel cell power supply 10; after the power grid returns to normal, the fuel cell power supply 10 stops running, and the hydrogen system resumes running to replenish the consumed fuel so that the fuel cell power supply 10 can be used next time when the power grid is abnormal. At this time, the radiator 16 is used to dissipate heat for the hydrogen system.

The humidification unit 113 is used to provide the required humidified air for the fuel cell stack 114. Furthermore, the humidification unit 113 is respectively connected to the air supply unit and the fuel cell stack 114 through pipelines. The humidification unit 113 converts the dry air delivered by the blower into humidified air and then delivers the humidified air to the fuel cell stack 114.

The fuel cell stack 114 is respectively connected to the humidification unit 113 and the supply integrated unit 112 through pipelines. As the core unit of the fuel cell power supply module 11, the fuel cell stack 114 is formed by a series of stacked single cells under the clamping action of two end plates, and is used to convert the energy fuel provided by the hydrogen storage unit into electrical energy output.

The electrical unit 115 controls the operation of the entire system and serves as the control center of the fuel cell power supply 10. The electrical unit 115 is respectively connected to the fuel cell stack 114 and the supply integrated unit 112. As shown in FIG4 , the electrical unit 115 includes: an inspection unit 1151, a controller 1152, a detection sensor 1153, a relay 1154 and a wireless transmission module 1155.

The inspection unit 1151 is connected to the controller 1152 and is used to detect the operating voltage of each single cell in the fuel cell stack 114 and transmit the detected voltage information to the controller 1152 .

The detection sensor 1153 is connected to the controller 1152, and is used to detect the current and voltage on the output power line of the fuel cell stack 114, and transmit the detected current information and voltage information to the controller 1152 to monitor the working state of the fuel cell stack 114. The detection sensor 1153 is composed of sensors such as a voltage sensor and a current sensor. In addition, a temperature sensor can also be provided to detect the temperature of the fuel cell stack 114.

The relay 1154 is arranged on the output power line of the fuel cell stack 114 to ensure electrical isolation. Further, the common end of the relay 1154 is connected to the output power line of the fuel cell stack 114, the control end (coil) of the relay 1154 is connected to the controller 1152, the normally closed contact of the relay 1154 is connected to the input end of the first inverter 12, and the normally open contact is grounded. When the relay 1154 is in the first state, that is, the common end is connected to the normally closed contact, the electric energy generated by the fuel cell stack 114 can be output to the first inverter 12, and when the relay 1154 is in the second state, that is, the common end is connected to the normally open contact, the electric energy generated by the fuel cell stack 114 cannot be output to the first inverter 12.

The controller 1152 serves as the control center of the entire system, and is used to send control signals to control the start and stop of devices such as blowers, hydrogen pressure reducing valves 1123, solenoid valves 1124, electronic water pumps, relays 1154, etc. For example, when the voltage or current detected by the detection sensor 1153 is abnormal, the controller 1152 controls the relay 1154 to be in the second state to ensure the safety of electricity use and avoid damage to components. For another example, the controller 1152 transmits the voltage information detected by the inspection unit 1151 and the information detected by the detection sensor 1153 to the peripheral devices through the wireless transmission module 1155 according to the preset time period, so that the manager can understand the current operating status in real time, find abnormalities in time, and avoid unnecessary losses. In addition, the controller 1152 also stores information such as the startup strategy, shutdown strategy, and alarm strategy of the entire system. Among them, the peripheral devices include but are not limited to host computers, mobile phones, computers and other devices.

Among them, the controller 1152 can be an integrated circuit chip with signal processing capabilities. The above-mentioned controller 1152 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the controller 1152 can also be any conventional processor. In this embodiment, preferably, the controller 1152 can be a processor of the STM32 series, such as STM32F103C8T6, STM32F103VET6 and other models.

The wireless transmission module 1155 is used for the interaction between the controller 1152 and the peripheral device, that is, the control instructions sent by the peripheral device are sent to the controller 1152, and the information sent by the controller 1152 is sent to the peripheral device. For example, the voltage information detected by the inspection unit 1151 and the information detected by the detection sensor 1153 sent by the controller 1152 are transmitted to the peripheral device.

The wireless transmission module 1155 may be a WiFi module, a ZigBee module, a 3G module, a 4G module, or other wireless transmission modules that meet the requirements. In this embodiment, preferably, the wireless transmission module 1155 may be a 3G module, for example, a 3G module of the type SIM6320C, CEM631, CEM600, WIDE M8800, FWP103, K3G, WM9881, etc.

The input end of the first inverter 12 is connected to the battery power supply module, and the output end thereof is also connected to the input end of the second inverter 13, the converter 15 and the power supply grid respectively. The first inverter 12 is used to convert the power output by the fuel cell power supply module 11 into three-phase four-wire (ABC phase line and N line) 380V AC power and output it to the power supply grid to supply power to the load, wherein, if only any one phase line and the neutral line of the ABC phase lines are connected, the output voltage is 220V AC power, for example, when the A phase and the N line are connected, the voltage at this time is 220V AC power. That is, the user can choose 380V AC power or 220V AC power according to the power demand. Among them, the first inverter 12 is a DC/AC inverter.

The second inverter 13 is connected to the first inverter 12, the auxiliary power supply 14, the converter 15 and the power supply grid respectively. The second inverter 13 is used to convert the 380V AC power output by the first inverter 12 into DC power to charge the auxiliary power supply 14; and to invert the DC power output by the auxiliary power supply 14 into 380V AC power and output it to the power supply grid to power the load. The second inverter 13 is a bidirectional DC/AC inverter, that is, the second inverter 13 can convert AC power into DC power output, and can also convert DC power into AC power output.

The auxiliary power supply 14 is connected to the second inverter 13. When the fuel cell power supply 10 is started to supply power to the load in an emergency, the voltage output by the auxiliary power supply 14 is converted into 380V AC power by the second inverter 13 to supply power to the load. At the same time, the power output by the auxiliary power supply 14 is converted into DC power by the second inverter 13 and the converter 15 to supply power to the fuel cell power supply module 11, so that the fuel cell of the fuel cell power supply module 11 is powered on to start generating electricity. After the fuel cell power supply module 11 generates electricity normally, the power output by the fuel cell power supply module 11 is converted into 380V AC power by the first inverter 12 to supply power to the load. At this time, the auxiliary power supply 14 stops supplying power and is in a charging state.

The input end of the converter 15 is connected to the first inverter 12 and the second inverter 13 respectively, and the output end thereof is connected to the fuel cell power supply module 11. The converter 15 is used to convert the AC power output by the first inverter 12 or the second inverter 13 into DC power and output it to the fuel cell power supply 10 to supply power, so as to maintain the power required for the normal operation of the power supply module of the fuel cell power supply 10, for example, to supply power to the controller 1152. The converter 15 can be a 24V converter, that is, the voltage of the DC power converted by the converter 15 is 24V; the converter 15 can also be a 12V converter, that is, the voltage of the DC power converted by the converter 15 is 12V.

In addition, as an optional implementation, the fuel cell power supply 10 further includes: a monitoring terminal 17. The monitoring terminal 17 is coupled to the wireless transmission module 1155 and is used to communicate with the controller 1152 to perform control and debugging. The monitoring terminal 17 can be a host computer or a computer.

Second embodiment

The embodiment of the present invention also provides a battery power system 20, as shown in FIG5. The battery power system 20 includes the above-mentioned fuel cell power supply 10 and a hydrogen system 21. The hydrogen system 21 includes: a hydrogen production unit 211 and a hydrogen storage unit 212 connected to the hydrogen production unit 211 by a pipeline. The hydrogen storage unit 212 is connected to the fuel cell power supply 10 by a pipeline, and is used to provide the fuel required for power generation for the fuel cell power supply 10. Among them, the hydrogen production unit 211 is used to prepare hydrogen, and the prepared hydrogen is transmitted to the hydrogen storage unit 212 for compression and storage. As an optional embodiment, hydrogen can be prepared by electrolyzing water, that is, when the power grid is normal, the hydrogen system 21 starts to run, and the fuel cell power supply 10 is not started at this time. When the power grid is abnormal and a backup power supply is needed, the fuel cell power supply 10 starts to run at this time, and the fuel previously generated by the hydrogen system 21 is converted into electrical energy output. After the power grid is normal, the fuel cell power supply 10 stops running, and the hydrogen system 21 resumes operation at this time, so as to replenish the consumed fuel so that the fuel cell power supply 10 can be used when the power grid is abnormal next time.

For the detailed description of the fuel cell power supply 10 in this embodiment, please refer to the description of the fuel cell power supply 10 in the first embodiment. To avoid repetition, they will not be introduced one by one here.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. A fuel cell power supply, characterized in that it is applied to a battery power supply system, wherein the battery power supply system further comprises: a hydrogen system, wherein the hydrogen system comprises: a hydrogen production unit and a hydrogen storage unit connected to the hydrogen production unit through a pipeline, and the fuel cell power supply comprises: a fuel cell power supply module, a first inverter, a second inverter, an auxiliary power supply and a converter; the fuel cell power supply module is connected to the first inverter, the first inverter is respectively connected to the second inverter and the converter, the auxiliary power supply is connected to the second inverter, the converter is also respectively connected to the fuel cell power supply module and the second inverter, the fuel cell power supply is also used to be connected to the hydrogen storage unit, and the first inverter and the second inverter are also used to be connected to a power supply grid; The first inverter is used to convert the power output by the fuel cell power supply module into 380V AC power and output it to the power supply grid to supply power to the load; The second inverter is used to convert the 380V AC power output by the first inverter into DC power to charge the auxiliary power supply; and to invert the DC power output by the auxiliary power supply into 380V AC power and output it to the power supply grid to power the load; The converter is used to convert the AC power output by the first inverter or the second inverter into DC power output to supply power to the fuel cell power supply module; The fuel cell power supply module is used to convert the fuel output by the hydrogen storage unit into electrical energy and output it to the first inverter; Wherein, the fuel cell power supply module includes: a supply integrated unit and a fuel cell stack, the supply integrated unit includes: a fuel supply unit, the fuel supply unit includes: a first pipeline, one end of the first pipeline is used to connect with the hydrogen storage unit, the other end of the first pipeline is connected to the fuel cell stack, and the first pipeline is provided with a hydrogen pressure reducing valve, a solenoid valve and a one-way valve; the fuel supply unit also includes: a second pipeline, one end of the second pipeline is used to connect with the nitrogen storage unit, the other end of the second pipeline is connected to the other end of the first pipeline, and the second pipeline is provided with a solenoid valve and a one-way valve; the The first pipeline is a hydrogen supply pipeline, and compressed hydrogen is stored in the hydrogen storage unit. The hydrogen pressure reducing valve is used to reduce the pressure of the hydrogen delivered from the hydrogen storage unit to the fuel cell stack. The second pipeline is a nitrogen purge pipeline. When the hydrogen storage unit delivers hydrogen to the fuel cell stack, the second pipeline does not deliver nitrogen. When the hydrogen storage unit stops delivering hydrogen to the fuel cell stack, the second pipeline performs nitrogen purge to ensure that the hydrogen storage unit and the nitrogen storage unit are always in an isolated state, thereby cleaning the residual hydrogen in the first pipeline and ensuring the durability of the fuel cell power supply module. 2. The fuel cell power supply according to claim 1 is characterized in that the fuel cell power supply also includes: a radiator, the radiator includes: a return water pipeline and a water outlet pipeline, the return water pipeline and the water outlet pipeline are both connected to the fuel cell power supply module through a pipeline, the radiator is used to provide coolant to the fuel cell power supply module, and dissipate heat for the fuel cell power supply module; and the return water pipeline and the water outlet pipeline are also used to be connected to the hydrogen production unit through a pipeline, and the radiator is also used to provide coolant to the hydrogen storage unit, and dissipate heat for the hydrogen storage unit. 3. The fuel cell power supply according to claim 2, characterized in that the fuel cell power supply module further comprises: a fuel cell box and an electrical unit and a humidification unit arranged in the fuel cell box, the supply integrated unit is connected to the humidification unit through a pipeline, the humidification unit is connected to the fuel cell stack through a pipeline, and the electrical unit is electrically connected to the fuel cell stack and the supply integrated unit respectively; The humidification unit is used to provide the required humidified air for the fuel cell stack; The supply integrated unit is used to supply air to the humidification unit; and is also used to provide the fuel cell stack with fuel required for power generation; and is also used to provide coolant to the fuel cell stack to achieve cooling of the fuel cell stack. 4. The fuel cell power supply according to claim 3 is characterized in that the supply integrated unit includes: an air supply unit, the air supply unit includes: a filter and a blower, the filter is connected to the blower through a pipeline, the blower is connected to the humidification unit through a pipeline, and the blower is used to pressurize the air filtered by the filter and then deliver it to the humidification unit. 5. The fuel cell power supply according to claim 3 is characterized in that the supply integrated unit also includes: a coolant supply unit, and the coolant supply unit includes: an electronic water pump, the water outlet end of the electronic water pump is connected to the fuel cell stack through a pipeline, the water outlet of the fuel cell stack is connected to the return water of the radiator through a pipeline, and the water outlet pipeline of the radiator is connected to the water inlet end of the electronic water pump; the electronic water pump is used to adjust the flow rate of the coolant for cooling the fuel cell stack. 6. The fuel cell power supply according to claim 3, characterized in that the electrical unit comprises: an inspection unit, a controller, a detection sensor, a relay and a wireless transmission module, and the controller is connected to the inspection unit, the detection sensor, the wireless transmission module and the relay respectively, The inspection unit is used to detect the operating voltage of each single cell in the fuel cell stack and transmit the detected voltage information to the controller; The relay is arranged on the output power line of the fuel cell stack to ensure electrical isolation; The detection sensor is used to detect the current and voltage on the output power line of the fuel cell stack and monitor the working state of the fuel cell stack. 7. The fuel cell power supply according to claim 6, characterized in that the fuel cell power supply further comprises: a monitoring terminal, the monitoring terminal is coupled to the wireless transmission module and is used to communicate with the controller. 8. A battery power system, comprising: a hydrogen system and a fuel cell power supply as claimed in any one of claims 1 to 7.