CN113119806A - Fuel cell system, automobile and power supply control method of fuel cell system - Google Patents
Fuel cell system, automobile and power supply control method of fuel cell system Download PDFInfo
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- CN113119806A CN113119806A CN202010042136.4A CN202010042136A CN113119806A CN 113119806 A CN113119806 A CN 113119806A CN 202010042136 A CN202010042136 A CN 202010042136A CN 113119806 A CN113119806 A CN 113119806A
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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
- 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
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Fuel Cell (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to the technical field of fuel cells, in particular to a fuel cell system, an automobile and a power supply control method, wherein the fuel cell system comprises: the system comprises a fuel cell, a fuel cell main DCDC, a power battery, a power distribution device, a bridge circuit and a vehicle control unit VCU; the fuel cell is connected with the power distribution device through the fuel cell main DCDC; the power battery is connected with the power distribution device; the bridge circuit is connected in parallel with the fuel cell main DCDC. According to the fuel cell system provided by the embodiment of the invention, the bridging loop is connected in parallel at the main DCDC position of the fuel cell, when the voltage difference between the fuel cell and the power cell is smaller, the bridging loop is connected, and the main DCDC of the fuel cell stops working, so that the working efficiency of the main DCDC of the fuel cell is improved, the power consumption of the whole vehicle is reduced, and the driving range is improved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel cell system, an automobile and a power supply control method of the fuel cell system.
Background
Due to the vigorous promotion of policy and regulations, the new energy automobile technology develops rapidly in recent years, however, the fuel cell is still in the exploration stage as an ultimate solution of automobile energy, the technology is still immature at the present stage, the performance of the whole automobile can not reach the level of the traditional automobile, the energy consumption is still a space capable of being reduced, and the driving range is still improved.
At present, a fuel cell system realizes real-time voltage boosting of fuel cell branches by means of a fuel cell main DCDC, and voltage of a whole vehicle is balanced. In the current fuel cell system, no matter how much the pressure difference between the fuel cell and the power cell is, the main DCDC of the fuel cell keeps a working state, and the working efficiency of the main DCDC of the fuel cell is higher when the voltage difference between the fuel cell and the power cell is larger, and can reach about 95%; however, when the voltage difference between the fuel cell and the power cell is small, the fuel cell main DCDC continues to work, and the electric quantity continues to be consumed, so that the working efficiency is low, and the driving range of the whole vehicle is reduced.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a fuel cell system, an automobile and a power supply control method of the fuel cell system.
To solve the above technical problem, an embodiment of the present invention provides a fuel cell system, including: the system comprises a fuel cell, a fuel cell main DCDC, a power battery, a power distribution device, a bridge circuit and a vehicle control unit VCU;
the fuel cell is connected with the power distribution device through a fuel cell main DCDC; the power battery is connected with the power distribution device; the bridge circuit is connected with the main fuel cell DCDC in parallel;
the VCU is used for acquiring the voltage of a fuel cell and the voltage of a power cell, and controlling the bridge circuit to be connected when the voltage difference between the voltage of the fuel cell and the voltage of the power cell is smaller than or equal to a first preset voltage value and/or the main DCDC of the fuel cell cannot work normally.
The invention has the beneficial effects that: the bridging loop is connected in parallel at the main DCDC position of the fuel cell, when the voltage difference between the fuel cell and the power cell is large, the main DCDC of the fuel cell works, the branch voltage of the fuel cell is improved, and the voltage of the whole vehicle is balanced; when the voltage difference between the fuel cell and the power cell is small, the bridging loop is connected, the main DCDC of the fuel cell stops working, the working efficiency of the main DCDC of the fuel cell is improved, the power consumption of the whole vehicle is reduced, and the driving range is increased. When the fuel cell main DCDC can not work normally, the whole vehicle running can be ensured by connecting the bridge circuit.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the vehicle control unit VCU is further configured to control the bridge circuit to be disconnected when a voltage difference between the fuel cell voltage and the power cell voltage is greater than a first preset voltage value.
The beneficial effect of adopting the further scheme is that: when the voltage difference between the fuel cell and the power cell is large, the bridging loop is disconnected, the fuel cell main DCDC works, the fuel cell branch voltage is improved through the fuel cell main DCDC, and the system voltage of the fuel cell and the power cell is balanced.
Further, the bridge circuit comprises a main circuit and a pre-charging circuit which are connected in parallel; the main loop comprises a contactor K connected with the fuel cell main DCDC in parallel1The pre-charging loop comprises a pre-charging relay K connected in series2And a pre-charge resistor R; the pre-charging relay K2And a series branch formed by the pre-charging resistor R and the contactor K1And (4) connecting in parallel.
The beneficial effect of adopting the further scheme is that: through setting up parallelly connected main loop and pre-charge circuit, realize when the voltage difference of fuel cell and power battery is less than the default, through pre-charge circuit pre-charge earlier, consume the electric energy through pre-charge resistance of pre-charge circuit, reduce the voltage difference, when the voltage difference is less than a definite value, put through the main loop again, after the voltage balance back around the main DCDC of fuel cell, break off the pre-charge circuit again, the main DCDC of fuel cell stops working this moment, improved main DCDC work efficiency of fuel cell, reduce whole car power consumption, improved the continuation of the journey mileage.
Further, the vehicle control unit VCU is configured to: when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a first preset voltage value, controlling the pre-charging relay K2Closing, when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a second preset voltage value, controlling the contactor K1Closing from said contact K1When closing, get upAfter a preset time, controlling the pre-charging relay K2Disconnecting; when the voltage difference between the fuel cell voltage and the power cell voltage is larger than a first preset voltage value, controlling the contactor K1And the pre-charge relay K2Are all disconnected; the first preset voltage value is greater than the second preset voltage value.
The beneficial effect of adopting the further scheme is that: when the voltage difference is less than or equal to the preset voltage value, closing the pre-charging relay K2The pre-charging resistor of the pre-charging loop consumes electric energy, reduces the voltage difference, and closes the contactor K when the voltage difference is smaller than a second preset voltage value1The main loop is switched on, and when the front and rear voltages of the main DCDC of the fuel cell are balanced, the pre-charging relay K is switched off2And at the moment, the main DCDC of the fuel cell stops working, so that the working efficiency of the main DCDC of the fuel cell is improved, the power consumption of the whole vehicle is reduced, and the driving range is improved.
Further, the preset time range is 1s-3 s.
Further, the first preset voltage value is 10V, and the second preset voltage value is 3V.
In order to solve the technical problem, an embodiment of the invention further provides an automobile, which includes the fuel cell system according to the above technical scheme.
In order to solve the above technical problem, an embodiment of the present invention further provides a power supply control method for a fuel cell system, which is implemented by using the fuel cell system in the foregoing technical solution, and includes: and acquiring the voltage of the fuel cell and the voltage of the power cell, and controlling the bridging loop to be switched on when the voltage difference between the voltage of the fuel cell and the voltage of the power cell is less than or equal to a first preset voltage value and/or the main DCDC of the fuel cell cannot work normally.
On the basis of the technical scheme, the invention can be further improved as follows.
And further, controlling the bridge circuit to be disconnected when the voltage difference between the fuel cell voltage and the power cell voltage is greater than a first preset voltage value.
Further, theThe bridging circuit comprises a main circuit and a pre-charging circuit which are connected in parallel; the main loop comprises a contactor K connected with the fuel cell main DCDC in parallel1The pre-charging loop comprises a pre-charging relay K connected in series2And a pre-charge resistor R; the pre-charging relay K2And a series branch formed by the pre-charging resistor R and the contactor K1Parallel connection;
when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a first preset voltage value, controlling the pre-charging relay K2Closing, when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a second preset voltage value, controlling the contactor K1Closing from said contact K1Starting when the switch is closed, controlling the pre-charging relay K after a preset time2Disconnecting;
when the voltage difference between the fuel cell voltage and the power cell voltage is larger than a first preset voltage value, controlling the contactor K1And the pre-charge relay K2Are all disconnected;
the first preset voltage value is greater than the second preset voltage value.
Additional aspects of the invention and its advantages will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a fuel cell system provided in an embodiment of the invention;
fig. 2 is a schematic structural view of a fuel cell system according to another embodiment of the present invention;
fig. 3 is a schematic structural view of a fuel cell system according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of a power supply control method of a fuel cell system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Fig. 1 is a schematic structural view of a fuel cell system provided by an embodiment of the present invention. As shown in fig. 1, the fuel cell system includes: the system comprises a fuel cell, a fuel cell main DCDC, a power battery, a power distribution device, a bridge circuit and a vehicle control unit VCU.
The fuel cell is connected with the power distribution device through a fuel cell main DCDC; the power battery is connected with the power distribution device; the bridge circuit is connected with the main fuel cell DCDC in parallel;
the VCU is used for acquiring the voltage of a fuel cell and the voltage of a power cell, and controlling the bridge circuit to be connected when the voltage difference between the voltage of the fuel cell and the voltage of the power cell is smaller than or equal to a first preset voltage value and/or the main DCDC of the fuel cell cannot work normally. In this embodiment, the first preset voltage value may be 10V.
In the fuel cell system provided by the embodiment, the bridging loop is connected in parallel at the main DCDC position of the fuel cell, and when the voltage difference between the fuel cell and the power cell is large, the main DCDC of the fuel cell works, so that the branch voltage of the fuel cell is increased, and the voltage of the whole vehicle is balanced; when the voltage difference between the fuel cell and the power cell is small, the bridging loop is connected, the main DCDC of the fuel cell stops working, the working efficiency of the main DCDC of the fuel cell is improved, the power consumption of the whole vehicle is reduced, and the driving range is increased. And when the fuel cell main DCDC can not work normally, the whole vehicle running can be ensured by connecting the bridge circuit.
The fuel cell system provided by the embodiment has the advantages of simple structure, easy realization, low cost of added parts; the working efficiency of the main DCDC of the fuel cell is improved under the condition of minimum system change, the energy consumption of the whole vehicle is reduced, the driving range is increased, and the user experience is improved.
Alternatively, in one embodiment, as shown in fig. 2, the power distribution device employs a high voltage distribution box PDU to which the fuel cell is connected through a fuel cell master DCDC; the power battery is connected with the high-voltage distribution box PDU, and the high-voltage distribution box PDU is connected with the motor M; the bridge circuit is connected in parallel with the main fuel cell DCDC.
The VCU is used for acquiring the voltage of a fuel cell and the voltage of a power cell, and controlling the bridge circuit to be connected when the voltage difference between the voltage of the fuel cell and the voltage of the power cell is smaller than or equal to a first preset voltage value and/or the main DCDC of the fuel cell cannot work normally.
In the embodiment, the bridging loop is connected in parallel at the main DCDC position of the fuel cell, and when the voltage difference between the fuel cell and the power cell is large, the main DCDC of the fuel cell works, so that the branch voltage of the fuel cell is increased, and the voltage of the whole vehicle is balanced; when the voltage difference between the fuel cell and the power cell is small, the bridging loop is connected, the main DCDC of the fuel cell stops working, the working efficiency of the main DCDC of the fuel cell is improved, the power consumption of the whole vehicle is reduced, and the driving range is increased. When the fuel cell main DCDC can not work normally, the whole vehicle running can be ensured by connecting the bridge circuit.
Optionally, in an embodiment, the vehicle control unit VCU is further configured to control the bridge circuit to open when a voltage difference between the fuel cell voltage and the power cell voltage is greater than a first preset voltage value.
In this embodiment, when the voltage difference between the fuel cell and the power cell is large, the bridge circuit is disconnected, the main fuel cell DCDC operates normally, and the branch voltage of the fuel cell is increased through the main fuel cell DCDC, so as to balance the system voltage of the fuel cell and the power cell.
Optionally, in one embodiment, as shown in fig. 3, the bridge circuit includes a main circuit and a pre-charge circuit connected in parallel; the main loop comprises a contactor K connected with the fuel cell main DCDC in parallel1The pre-charging loop comprises a pre-charging relay K connected in series2And a pre-charge resistor R; the pre-charging relay K2And a series branch formed by the pre-charging resistor R and the contactor K1And (4) connecting in parallel.
In the above embodiment, by arranging the main circuit and the pre-charging circuit in parallel, when the voltage difference between the fuel cell and the power cell is smaller than the preset value, the pre-charging circuit is used for pre-charging, the pre-charging resistor of the pre-charging circuit consumes electric energy to reduce the voltage difference, when the voltage difference is smaller than a certain value, the main circuit is connected, when the front voltage and the rear voltage of the main DCDC of the fuel cell are balanced, the pre-charging circuit is disconnected, and at this time, the main DCDC of the fuel cell stops working, so that the working efficiency of the main DCDC of the fuel cell is improved, the power consumption of the whole vehicle.
Optionally, in one embodiment, the vehicle control unit VCU is configured to: when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a first preset voltage value, controlling the pre-charging relay K2Closing, when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a second preset voltage value, controlling the contactor K1Closing from said contact K1Starting when the switch is closed, controlling the pre-charging relay K after a preset time2Disconnecting; when the voltage difference between the fuel cell voltage and the power cell voltage is larger than a first preset voltage value, controlling the contactor K1And the pre-charge relay K2Are all disconnected. The first preset voltage value, the second preset voltage value and the preset time can be set according to actual requirements. In this embodiment, the first preset voltage value may be 10V, and the second preset voltage value may be 3V. The preset time can be in a range of 1s-3 s.
In the above embodiment, when the voltage difference is less than or equal to the preset voltage value, the pre-charge relay K is closed2The pre-charging resistance of the pre-charging loop consumes electric energy and reducesVoltage difference, when the voltage difference is less than the second preset voltage value, closing the contactor K1The main loop is switched on, and when the front and rear voltages of the main DCDC of the fuel cell are balanced, the pre-charging relay K is switched off2And at the moment, the main DCDC of the fuel cell stops working, so that the working efficiency of the main DCDC of the fuel cell is improved, the power consumption of the whole vehicle is reduced, and the driving range is improved.
The embodiment of the invention also provides an automobile which comprises the fuel cell system in the technical scheme.
The embodiment of the present invention further provides a power supply control method for a fuel cell system, which is implemented by using the fuel cell system provided by the above embodiment, and includes: and acquiring the voltage of the fuel cell and the voltage of the power cell, and controlling the bridging loop to be switched on when the voltage difference between the voltage of the fuel cell and the voltage of the power cell is less than or equal to a first preset voltage value and/or the main DCDC of the fuel cell cannot work normally.
Optionally, in an embodiment, the method further includes controlling the bridge circuit to open when a voltage difference between the fuel cell voltage and the power cell voltage is greater than a first preset voltage value.
Optionally, in one embodiment, the bridge circuit comprises a main circuit and a pre-charge circuit connected in parallel;
the main loop comprises a contactor K connected with the fuel cell main DCDC in parallel1The pre-charging loop comprises a pre-charging relay K connected in series2And a pre-charge resistor R; the pre-charging relay K2And a series branch formed by the pre-charging resistor R and the contactor K1Parallel connection; when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a first preset voltage value, controlling the pre-charging relay K2Closing, when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a second preset voltage value, controlling the contactor K1Closing from said contact K1Starting when the switch is closed, controlling the pre-charging relay K after a preset time2Disconnecting; when the voltage difference between the fuel cell voltage and the power cell voltage is larger than a first preset voltage value, controlling the contactorK1And the pre-charge relay K2Are all disconnected.
Fig. 4 is a schematic flow chart of a power supply control method of a fuel cell system according to an embodiment of the present invention. As shown in fig. 4, the method includes:
s401, detecting reported fuel cell voltage U1And power battery voltage U2；
S402, calculating the voltage difference U ═ U1-U2；
S403, judging whether the | U | is larger than a first preset voltage value of 10V or not, and if so, executing S404; otherwise, executing S406;
s404, opening the contactor K1And a pre-charge relay K2；
S305, operating the fuel cell main DCDC;
s406, closing the pre-charging relay K2；
S407, when the voltage difference is smaller than a second preset voltage value, closing the contactor K1(ii) a In this embodiment, the second preset voltage value may be 3V;
s408, disconnecting the pre-charging relay K after a preset time2(ii) a In this embodiment, the preset time may take a value of 2 s;
and S409, stopping the operation of the fuel cell main DCDC.
In the power supply control method of the fuel cell system provided in the above embodiment, the bridging loop is connected in parallel at the main DCDC position of the fuel cell, and when the voltage difference between the fuel cell and the power cell is large, the contactor K is turned off1And a pre-charge relay K2The main DCDC of the fuel cell works normally, the branch voltage of the fuel cell is improved, and the voltage of the whole vehicle is balanced; when the voltage difference between the fuel cell and the power cell is small, the bridging loop is connected, the main DCDC of the fuel cell stops working, the working efficiency of the main DCDC of the fuel cell is improved, the power consumption of the whole vehicle is reduced, and the driving range is increased. And when the fuel cell main DCDC can not work normally, the whole vehicle running can be ensured by connecting the bridge circuit.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A fuel cell system, characterized by comprising: the system comprises a fuel cell, a fuel cell main DCDC, a power battery, a power distribution device, a bridge circuit and a vehicle control unit VCU;
the fuel cell is connected with the power distribution device through a fuel cell main DCDC; the power battery is connected with the power distribution device; the bridge circuit is connected with the main fuel cell DCDC in parallel;
the VCU is used for acquiring the voltage of a fuel cell and the voltage of a power cell, and controlling the bridge circuit to be connected when the voltage difference between the voltage of the fuel cell and the voltage of the power cell is smaller than or equal to a first preset voltage value and/or the main DCDC of the fuel cell cannot work normally.
2. The fuel cell system of claim 1, wherein the vehicle control unit VCU is further configured to control the bridge circuit to open when a voltage difference between the fuel cell voltage and the power cell voltage is greater than a first preset voltage value.
3. The fuel cell system according to claim 1 or 2, wherein the bridge circuit includes a main circuit and a precharge circuit connected in parallel;
the main loop comprises a contactor K connected with the fuel cell main DCDC in parallel1The pre-charging loop comprises a pre-charging relay K connected in series2And a pre-charge resistor R; the pre-charging relay K2And a series branch formed by the pre-charging resistor R and the contactor K1And (4) connecting in parallel.
4. The fuel cell system of claim 3, wherein the Vehicle Control Unit (VCU) is configured to:
when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a first preset voltage value, the pre-charging relay K2 is controlled to be closed, and when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a second preset voltage value, the contactor K is controlled1Closing from said contact K1Starting when the switch is closed, controlling the pre-charging relay K after a preset time2Disconnecting;
when the voltage difference between the fuel cell voltage and the power cell voltage is larger than a first preset voltage value, controlling the contactor K1And the pre-charge relay K2Are all disconnected;
the first preset voltage value is greater than the second preset voltage value.
5. The fuel cell system according to claim 4, wherein the preset time is in a range of 1s to 3 s.
6. The fuel cell system according to claim 4, wherein the first preset voltage value is 10V, and the second preset voltage value is 3V.
7. An automobile characterized by comprising the fuel cell system according to any one of claims 1 to 6.
8. A power supply control method of a fuel cell system, which is implemented by the fuel cell system according to any one of claims 1 to 6, comprising: and acquiring the voltage of the fuel cell and the voltage of the power cell, and controlling the bridging loop to be switched on when the voltage difference between the voltage of the fuel cell and the voltage of the power cell is less than or equal to a first preset voltage value and/or the main DCDC of the fuel cell cannot work normally.
9. The power supply control method according to claim 8, further comprising controlling the bridge circuit to open when a voltage difference between the fuel cell voltage and the power cell voltage is greater than a first preset voltage value.
10. The power supply control method according to claim 8 or 9, wherein the bridge circuit includes a main circuit and a precharge circuit connected in parallel; the main loop comprises a contactor K connected with the fuel cell main DCDC in parallel1The pre-charging loop comprises a pre-charging relay K connected in series2And a pre-charge resistor R; the pre-charging relay K2And a series branch formed by the pre-charging resistor R and the contactor K1Parallel connection;
when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a first preset voltage value, controlling the pre-charging relay K2Closing, when the voltage difference between the fuel cell voltage and the power cell voltage is less than or equal to a second preset voltage value, controlling the contactor K1Closing from said contact K1Starting when the switch is closed, controlling the pre-charging relay K after a preset time2Disconnecting;
when the voltage difference between the fuel cell voltage and the power cell voltage is larger than a first preset voltage value, controlling the contactor K1And the pre-charge relay K2Are all disconnected;
the first preset voltage value is greater than the second preset voltage value.
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