CN114954045A - Power supply system capable of connecting multiple sets of fuel cells in parallel and control method thereof - Google Patents

Power supply system capable of connecting multiple sets of fuel cells in parallel and control method thereof Download PDF

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Publication number
CN114954045A
CN114954045A CN202210760081.XA CN202210760081A CN114954045A CN 114954045 A CN114954045 A CN 114954045A CN 202210760081 A CN202210760081 A CN 202210760081A CN 114954045 A CN114954045 A CN 114954045A
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China
Prior art keywords
fuel cell
fuel cells
lithium ion
ion battery
power supply
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CN202210760081.XA
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Chinese (zh)
Inventor
赵邓玉
程龙
陆浩
曹文娟
刘海亮
朱荣杰
孙毅
王涛
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Aerospace Hydrogen Energy Shanghai Technology Co ltd
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Aerospace Hydrogen Energy Shanghai Technology Co ltd
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Priority to CN202210760081.XA priority Critical patent/CN114954045A/en
Publication of CN114954045A publication Critical patent/CN114954045A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/75—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using propulsion power supplied by both fuel cells and batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B60L53/22—Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Fuel Cell (AREA)

Abstract

The invention discloses a power supply system capable of connecting a plurality of sets of fuel cells in parallel and a control method thereof, wherein the control method comprises the following steps: the system comprises a control subsystem, a fuel cell subsystem, a DC/DC converter, a lithium ion battery and an inverter which are connected in sequence; the fuel cell subsystem comprises a plurality of fuel cells connected in parallel; the lithium ion battery carries out electric energy input or electric energy output through the DC/DC converter, and the inverter inverts the direct current of the power supply system and outputs the inverted direct current to a load; the control subsystem comprises a main controller, a plurality of fuel cell controllers and a lithium ion battery controller which are connected through signals; the lithium ion battery controller can monitor the SOC value of the lithium ion battery; and the main controller controls the start and stop of the fuel cell according to the SOC value. When each set of low-power fuel cell works, the fuel cell only needs to be loaded to rated power to operate, and the working condition does not need to be changed according to load change; and when a set of low-power fuel cells are maintained, the use of other fuel cells is not influenced.

Description

Power supply system capable of connecting multiple sets of fuel cells in parallel and control method thereof
Technical Field
The invention relates to the field of fuel cell power supply systems, in particular to a power supply system capable of connecting a plurality of sets of fuel cells in parallel and a control method thereof.
Background
The load of the power supply system comprises various electric equipment, and the dynamic response performance of the fuel cell is poor, so that the fuel cell and the lithium battery are required to be mixed for use when the fuel cell supplies power to a continuously changing load, and the defect of the fuel cell is made up by the good dynamic characteristic of the lithium battery.
The power supply system mainly comprises a fuel cell subsystem, a power conversion subsystem, a lithium ion battery subsystem, an inversion subsystem, a control subsystem and other multi-field subsystems. Generally, a fuel cell system needs to dynamically adjust loading conditions according to different load requirements, and frequent adjustment of the loading conditions and frequent start and stop of the fuel cell system can reduce the service life of the fuel cell and reduce the hydrogen utilization rate. The fuel cell generates different water and heat under different working condition adjustment, the larger the output power is, the more water is generated, and the more heat is generated; frequent rapid working condition adjustment provides great challenge for maintaining water and heat balance of internal reaction of the fuel cell, and influences on service life of the fuel cell are great.
The existing start-stop control method of the fuel cell subsystem is mainly judged according to an SOC value (State of Charge, percentage of residual electricity quantity in total available electricity quantity) fed back to the control subsystem by a BMS (battery management system), and the control subsystem sends commands of starting, loading, load reduction or shutdown and the like to the fuel cell subsystem. The power of the load may change during the working process, so that the fuel cell system is subjected to working condition adjustment, frequent working condition adjustment enables the output power and the temperature of the fuel cell to repeatedly show a stepwise rising or falling trend, the temperature change of the fuel cell cannot be stable, the water and the heat are unbalanced, and the failure and the service life decay of the fuel cell are accelerated.
Disclosure of Invention
The invention aims to solve the problems of failure and service life attenuation of the fuel cell caused by frequent working condition adjustment required by different load requirements of the conventional fuel cell system, and provides a power supply system capable of connecting a plurality of sets of fuel cells in parallel and a control method thereof on the basis of replacing the fuel cell system with a plurality of sets of low-power fuel cells connected in parallel on the conventional single set of high-power fuel cell power supply system; therefore, frequent working condition adjustment of the original high-power fuel cell is avoided.
In order to achieve the above object, the present invention provides a power supply system capable of connecting multiple fuel cells in parallel, comprising: the system comprises a control subsystem, a fuel cell subsystem, a DC/DC converter, a lithium ion battery and an inverter which are connected in sequence;
the fuel cell subsystem comprises a plurality of fuel cells connected in parallel; the DC/DC converter is used for increasing the output voltage of the fuel cell and then outputting the increased output voltage to the lithium ion battery; the lithium ion battery inputs electric energy through the DC/DC converter and outputs the electric energy through the inverter, and the inverter inverts direct current converted by the DC/DC converter of the fuel battery or direct current output by the lithium ion battery into alternating current and outputs the alternating current to a load;
the control subsystem comprises a main controller, a plurality of fuel cell controllers and a lithium ion battery controller which are connected through signals; the lithium ion battery controller can monitor the SOC value of the lithium ion battery; and the main controller sends an instruction signal to the fuel cell controller according to the SOC value of the lithium ion battery to control the working state of the fuel cell.
Preferably, the control subsystem further comprises a DC/DC converter controller and an inverter controller respectively in signal connection with the main controller.
Preferably, the maximum charge-discharge rate of the lithium ion battery is not less than 5C.
Preferably, in the fuel cell subsystem, the number of the fuel cells connected in parallel is 2 to 10.
Preferably, the control subsystem is also in signal connection with an alarm indicator lamp.
Correspondingly, the invention also discloses a control method of the power supply system with the parallel multiple sets of fuel cells, which comprises the following steps:
s1, starting a power supply system, and monitoring the SOC value information of the lithium ion battery by the lithium ion battery controller and transmitting the information to the main controller;
s2, the main controller transmits signals to the fuel battery controller and/or the lithium ion battery controller of the control subsystem according to the SOC value, and automatically controls the power supply system, and the control method comprises the following steps:
s2.1, if the SOC is less than p, the lithium ion battery controller receives a signal from the main controller and controls the power supply system to be powered off; wherein p is more than or equal to 5% and less than or equal to 15%;
s2.2, if the SOC is more than q, the fuel cell controller receives a signal from the main controller and controls the fuel cell subsystem to be in a standby state; wherein q is more than or equal to 75 percent and less than or equal to 90 percent;
s2.3, if the SOC is not less than p and not more than q, the fuel cell controller receives a signal from the main controller, controls to start at least one set of fuel cells and loads the set of fuel cells to rated power for outputting voltage to the load; and adjusting the starting number of the fuel cells according to the SOC value, wherein the starting number of the fuel cells is inversely related to the SOC value.
Preferably, the total number of the fuel cells is n, and is respectively marked as 1 st to n th sets; in step S2.3, the starting sequence of the fuel cell is: and starting the 1 st to the nth fuel cells in sequence along with the gradual reduction of the SOC value.
Preferably, p is 10%, q is 80%; when n is more than or equal to 3, the step S2.3 is as follows:
if the SOC is more than or equal to 60% and less than or equal to q, only starting the 1 st set of fuel cells; if the SOC is more than or equal to 50% and less than 60%, starting the fuel cells of the 1 st to (n-2) th sets; if the SOC is more than or equal to 40% and less than 50%, starting the 1 st to (n-1) th fuel cells; if the SOC is less than 40% and less than p, starting all the fuel cells.
The beneficial effects of the invention comprise:
(1) a set of high-power fuel cell system has the disadvantages of high cost, low volume power and poor maintainability, and the service life of the fuel cell system can be influenced due to the adjustment of working conditions; however, a plurality of sets of standard low-power fuel cells are connected in parallel, so that the maintenance is easy, when each set of low-power fuel cell works, the low-power fuel cell only needs to be loaded to rated power for operation, and the working condition does not need to be changed constantly according to the change of the load; when a set of low-power fuel cells is maintained, the use of other fuel cells connected in parallel is not influenced;
(2) the parallel use of a plurality of sets of fuel cells ensures that the fuel cells can stably operate under rated power all the time, reduces hydrogen blowing and discharging caused by frequent starting and stopping of the fuel cells, and improves the utilization rate of the hydrogen.
Drawings
FIG. 1 is a schematic diagram of a power system for multiple parallel fuel cells according to the present invention;
fig. 2 is a flow chart of the start-stop control method for multiple sets of fuel cell subsystems according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Unless clearly indicated to the contrary, each aspect or embodiment defined herein may be combined with any other aspect or embodiments. In particular, any feature indicated as being preferred or advantageous may be combined with any other feature indicated as being preferred or advantageous.
As shown in fig. 1, the present invention provides a power supply system capable of connecting multiple fuel cells in parallel, which comprises a control subsystem, and a fuel cell subsystem, a DC/DC converter, a lithium ion battery, and an inverter connected in sequence.
The lithium ion battery can be charged by inputting electric energy through the DC/DC converter and can also be output by outputting the electric energy, and the inverter inverts direct current output by the lithium ion battery into alternating current and outputs the alternating current to a load.
The Control subsystem comprises a main controller, a plurality of Fuel cell Control units (FCUs), a lithium ion battery controller, a DC/DC converter controller and an inverter controller which are mutually connected through signals; further, all controllers of the control subsystem are connected to each other through a Controller Area Network (CAN). In some embodiments, the lithium ion battery controller is a bms (battery Management system); the BMS can detect the SOC value of the lithium ion battery.
The Fuel Cell subsystem comprises a plurality of Fuel cells (FC, Fuel Cell) connected in parallel, wherein the Fuel cells are proton exchange membrane Fuel cells and are places for controlling the flow and pressure of hydrogen and air required by the reaction to perform electrochemical reaction to generate electricity, water and heat.
The DC/DC converter is connected with the electric energy output end of the fuel cell subsystem and the electric energy input end of the lithium ion battery, and converts the low voltage output by the fuel cell subsystem into the high voltage required by the charging of the lithium ion battery.
The lithium ion battery is connected with the electric energy output end of the DC/DC converter and the electric energy input end of the inverter, and outputs the electric energy of the lithium ion battery subsystem and/or the electric energy output by the fuel cell subsystem and the electric energy converted by the DC/DC converter to the inverter; the maximum charge-discharge multiplying power of the lithium ion battery subsystem is more than 5C so as to meet the characteristic of instant high-power fluctuation of a load.
The inverter inverts the direct current voltage of the lithium ion battery subsystem and the direct current voltage of the fuel battery converted by the DC/DC converter into alternating current 220V or 380V alternating current voltage; the inverter is connected with the load input end and the electric energy output end of the lithium ion battery.
The control method of the power supply system comprises the following steps:
s1, starting the power supply system, and the lithium ion battery controller monitors the SOC of the lithium ion battery and transmits the information to the main controller;
s2, the main controller transmits signals to other components of the control subsystem according to the SOC to automatically control the circuit; comprises the following steps:
s2.1, if the SOC is less than p, powering down the power supply system; wherein p is more than or equal to 5% and less than or equal to 15%;
s2.2, if the SOC is more than q, stopping the fuel cell subsystem; wherein q is more than or equal to 75% and less than or equal to 90%;
s2.3, if the SOC is not less than p and not more than q, starting at least one set of fuel cell and loading to rated power, and outputting voltage to a load by a power supply system; and adjusting the starting number of the fuel cells and loading the started fuel cells to rated power according to the size of the SOC value, wherein the starting number of the fuel cells is in negative correlation with the SOC value.
And p is a threshold condition of power-off of the power supply system, and q is a threshold condition of shutdown of the fuel cell subsystem.
According to the steps, when each set of low-power fuel cell works, only the low-power fuel cell needs to be loaded to rated power to operate, and the working condition does not need to be changed constantly according to load change; and when a set of low-power fuel cells are maintained, the use of other fuel cells connected in parallel is not influenced. The parallel use of a plurality of sets of fuel cells ensures that the fuel cells can stably operate under rated power all the time, and can also reduce hydrogen blowing and discharging caused by frequent starting and stopping of the fuel cells and improve the utilization rate of the hydrogen.
Specific control methods can be referred to the following examples.
Examples
As shown in fig. 2, the start and stop of the power supply system are fed back to the main controller by a BMS (lithium ion battery controller) of the lithium ion battery, and the main controller regulates and controls the start and the stop of the lithium ion battery and the inverter, so as to ensure the stable output of the power supply system. And after the power supply is started, the main controller sends a starting command to the lithium ion battery BMS and receives the SOC of the BMS in real time. The control subsystem is connected with an alarm indicator lamp through a signal; when the BMS detects that the SOC value of the lithium ion battery is less than 10%, the alarm indicator lights flicker, the main controller sends a shutdown command to the BMS, and the whole power supply system is powered off. When the BMS detects that the SOC value is more than or equal to 10%, the main controller sends a starting command to the inverter and outputs alternating current.
The starting and stopping control method of the multiple sets of fuel cell subsystems is mainly characterized in that the starting and stopping control method is mainly judged according to SOC values fed back to a main controller by a lithium ion battery subsystem BMS, and the control subsystem sends commands of starting, loading, load reduction or stopping and the like to the multiple sets of fuel cell subsystems connected in parallel. Setting the total number of the fuel cells as n, and respectively marking as 1 st to n th sets; when the control subsystem detects that the SOC value is less than 80%, the control subsystem sends a starting and loading rated power command to the 1 st fuel cell. When the control subsystem detects that the SOC is more than or equal to 50% and less than 60%, the control subsystem sends a starting and loading to rated power command to the 1 st set of fuel cells and simultaneously sends a starting and loading to rated power command to the 2 nd to (n-2) sets of fuel cells again. When the control subsystem detects that the SOC value is more than or equal to 40% and less than 50%, the control subsystem sends a command of starting and loading to rated power to the 1 st set of fuel cells and simultaneously sends a command of starting and loading to rated power to the 2 nd to (n-1) sets of fuel cells again. When the control subsystem detects that the SOC is more than or equal to 10% and less than 40%, the control subsystem sends a command of starting and loading to rated power to the 1 st set of fuel cells and simultaneously sends a command of starting and loading to rated power to the 2 nd to nth sets of fuel cells again. And the control subsystem sends a shutdown command to all the fuel cells until the control subsystem detects that the SOC value is more than or equal to 80%.
Recording the fuel cells as 1 st to nth sets respectively, and starting the fuel cells in sequence according to the SOC values; the method aims to reduce the number of fuel cells needing to be started and stopped as much as possible and prolong the service life of the fuel cells when the load power is changed.
In summary, a plurality of sets of standard low-power fuel cells are connected in parallel, so that the maintenance is easy, when each set of low-power fuel cell works, the fuel cell only needs to be loaded to rated power for operation, and the working condition does not need to be changed constantly according to the load change; and when a set of low-power fuel cells are maintained, the use of other fuel cells connected in parallel is not influenced. The parallel use of a plurality of sets of fuel cells ensures that the fuel cells can stably operate under rated power all the time, reduces hydrogen blowing and discharging caused by frequent starting and stopping of the fuel cells, and improves the utilization rate of the hydrogen.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.

Claims (8)

1. A power supply system capable of connecting a plurality of fuel cells in parallel, comprising: the system comprises a control subsystem, a fuel cell subsystem, a DC/DC converter, a lithium ion battery and an inverter which are connected in sequence;
the fuel cell subsystem comprises a plurality of fuel cells connected in parallel; the DC/DC converter is used for increasing the output voltage of the fuel cell and then outputting the increased output voltage to the lithium ion battery; the lithium ion battery inputs electric energy through the DC/DC converter and outputs the electric energy through the inverter, and the inverter inverts direct current converted by the DC/DC converter of the fuel battery or direct current output by the lithium ion battery into alternating current and outputs the alternating current to a load;
the control subsystem comprises a main controller, a plurality of fuel cell controllers and a lithium ion battery controller which are connected through signals; the lithium ion battery controller can monitor the SOC value of the lithium ion battery; and the main controller sends an instruction signal to the fuel cell controller according to the SOC value of the lithium ion battery to control the working state of the fuel cell.
2. The power system of claim 1 in which the control subsystem further comprises: and the DC/DC converter controller and the inverter controller are respectively connected with the main controller through signals.
3. The power supply system capable of connecting a plurality of fuel cells in parallel according to claim 1, wherein the maximum charge-discharge rate of the lithium ion battery is not less than 5C.
4. The power supply system capable of connecting a plurality of fuel cells in parallel according to claim 1, wherein the number of fuel cells connected in parallel in the fuel cell subsystem is 2-10.
5. The power system of claim 1 in which the control subsystem is further signally connected an alarm light.
6. A control method of a power supply system of parallel multi-fuel cell sets as claimed in any one of claims 1 to 5, characterized by comprising the steps of:
s1, starting a power supply system, and monitoring the SOC value information of the lithium ion battery by the lithium ion battery controller and transmitting the information to the main controller;
s2, the main controller transmits signals to the fuel battery controller and/or the lithium ion battery controller of the control subsystem according to the SOC value, and automatically controls the power supply system, and the control method comprises the following steps:
s2.1, if the SOC is less than p, the lithium ion battery controller receives a signal from the main controller and controls the power supply system to be powered off; wherein p is more than or equal to 5% and less than or equal to 15%;
s2.2, if the SOC is more than q, the fuel cell controller receives a signal from the main controller and controls the fuel cell subsystem to be in a standby state; wherein q is more than or equal to 75% and less than or equal to 90%;
s2.3, if the SOC is not less than p and not more than q, the fuel cell controller receives a signal from the main controller, controls to start at least one set of fuel cells and loads the set of fuel cells to rated power for outputting voltage to the load; and adjusting the starting number of the fuel cells according to the SOC value, wherein the starting number of the fuel cells is inversely related to the SOC value.
7. The control method of the power supply system of the parallel multi-fuel cell as set forth in claim 6, wherein the total number of the fuel cells is n and is respectively recorded as the 1 st to n th sets; in step S2.3, the starting sequence of the fuel cell is: and starting the 1 st to the nth fuel cells in sequence along with the gradual reduction of the SOC value.
8. The control method of a power supply system of parallel multi-fuel cells according to claim 7, wherein p is 10%, q is 80%; n is more than or equal to 3; step S2.3 is:
if the SOC is more than or equal to 60% and less than or equal to q, only starting the 1 st set of fuel cells; if the SOC is more than or equal to 50% and less than 60%, starting the 1 st to (n-2) th sets of fuel cells; if the SOC is more than or equal to 40% and less than 50%, starting the 1 st to (n-1) th fuel cells; if the SOC is less than 40% and less than p, starting all the fuel cells.
CN202210760081.XA 2022-06-29 2022-06-29 Power supply system capable of connecting multiple sets of fuel cells in parallel and control method thereof Pending CN114954045A (en)

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