Power distribution operation process of hydrogen fuel cell system

Abstract

The invention discloses a power distribution operation process of a hydrogen fuel cell system. According to the technical scheme, the power distribution operation process of the hydrogen fuel cell system is characterized by comprising a hydrogen fuel cell stack, a power cell, an air blower, a PTC, a step-down DC, a cooling fan, a water pump and a power distribution system, the power distribution system comprises a stack electrifying module, a main negative relay, a first DC relay, a second DC relay, a pre-charging resistor, a pre-charging relay, a power battery relay, a power battery fuse, a braking resistor, a device fuse, a PTC relay and a voltage reduction DC relay. According to the hydrogen fuel cell system power distribution operation process, the fuel cell and the power cell work together to stably output outwards, all devices of the system can be well connected through the hydrogen fuel cell system power distribution operation process, a system starting operation test is carried out, and according to test feedback, parameter selection of all the devices can be conveniently adjusted to meet the system operation test requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cell systems, and in particular to a power distribution operation process of a hydrogen fuel cell system. Background Art

[0002] Hydrogen fuel cells are batteries that use hydrogen, a chemical element, to store energy. The basic principle is the reverse reaction of water electrolysis, where hydrogen and oxygen are supplied to the anode and cathode respectively. After hydrogen diffuses outward through the anode and reacts with the electrolyte, it releases electrons and reaches the cathode through the external load. It has the characteristics of no pollution, no noise and high efficiency.

[0003] A hydrogen fuel cell system power distribution operation process is now proposed, which can well connect the components of the system and make the data of each component meet the test requirements through running tests. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a hydrogen fuel cell system power distribution operation process, which can output stably to the outside through the joint work of the fuel cell and the power battery. The hydrogen fuel cell system power distribution operation process can well connect the various components of the system to perform system startup operation test. According to the test feedback, the parameter selection of each component can be conveniently adjusted to meet the system operation test requirements.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a hydrogen fuel cell system power distribution operation process, including a hydrogen fuel cell stack, a power battery, a blower, a PTC, a step-down DC, a cooling fan, a water pump and a power distribution system, characterized in that: the power distribution system includes a stack discharge module, a main negative relay, a DC relay 1, a DC relay 2, a pre-charge resistor, a pre-charge relay, a power battery relay, a power battery fuse, a brake resistor, a device fuse, a PTC relay and a step-down DC relay;

[0006] Main negative relay: used to connect or cut off the battery stack output;

[0007] DC relay 1 and DC relay 2: realize on-off control of DC input and output sides;

[0008] Pre-charge resistor: connected to the pre-charge circuit, the resistance value of the pre-charge resistor can be selected according to the power nature of the electrical appliance to be pre-charged, so as to adjust the pre-charge current and pre-charge the device more reasonably and stably;

[0009] Pre-charging relay: realizes the on-off control of the pre-charging circuit;

[0010] Power battery relay: realizes the on-off control of the output and input main lines of the power battery;

[0011] Power battery fuse: to provide overcurrent protection for the power battery to protect the power battery;

[0012] Braking resistor: To protect the power battery in case of abnormal emergencies, the braking resistor value is changed to limit and control the current;

[0013] PTC relay: realizes the on-off control of the PTC input side;

[0014] Step-down DC relay: realizes the on-off control of the step-down DC input side.

[0015] By adopting the above technical scheme, the system operation and distribution process includes: battery stack discharge module, main negative relay, current and voltage detector, DC relay 1, DC relay 2, pre-charging resistor, pre-charging relay, power battery relay, power battery fuse, braking resistor, device fuse, PTC relay, step-down DC relay and various functional devices. At the beginning of system operation, the power battery outputs energy to the outside to pre-charge the system devices. After the device pre-charging is completed, the system operates normally and the fuel cell generates electricity. When the outside of the system needs high power, the fuel cell and the power battery work together to stably output energy to the outside. During the dynamic operation of the system, the system adjusts the battery stack load gear according to the power battery SOC value and the power required by the periphery. The power distribution operation process of the hydrogen fuel cell system can well connect the various devices of the system to perform system startup and operation tests. According to the test feedback, the parameter selection of each device can be conveniently adjusted to meet the system operation test requirements.

[0016] The present invention is further configured such that: one side of the hydrogen fuel cell is provided with a current and voltage detector.

[0017] By adopting the above technical solution, a current and voltage detector is set to detect the voltage and current data of the fuel cell stack in real time.

[0018] The present invention is further configured as follows: the PTC relay is connected between the device fuse and the PTC, and the step-down DC relay is connected between the device fuse and the step-down DC.

[0019] By adopting the above technical solution, the pre-charging resistor and the pre-charging relay cooperate with the PTC relay and the step-down DC relay logic action to complete the pre-charging function of the system components.

[0020] The present invention is further configured such that the output end of the device fuse is respectively connected to the power battery, the blower, the PTC and the step-down DC.

[0021] By adopting the above technical solution, overcurrent protection is provided to each device to protect each device.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. When the fuel cell is running to generate electricity and the system needs high power outside, the fuel cell and the power battery work together to stably output energy to the outside. During the dynamic operation of the system, the system adjusts the stack load gear according to the power battery SOC value and the power required by the periphery;

[0024] 2. The power distribution operation process of the hydrogen fuel cell system can well connect the various components of the system and conduct system startup and operation tests. According to the test feedback, the parameter selection of each component can be conveniently adjusted to meet the system operation test requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] In the figure: 1. Hydrogen fuel cell stack; 2. Stack discharge module; 3. Current and voltage detector; 4. Main negative relay; 5. DC relay one; 6. DC relay two; 7. Pre-charge resistor; 8. Pre-charge relay; 9. Power battery relay; 10. Braking resistor; 11. Power battery fuse; 12. Power battery; 13. Device fuse; 14. PTC relay; 15. Step-down DC relay; 16. Blower; 17. PTC; 18. Step-down DC; 19. Cooling fan; 20. Water pump. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0028] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The present invention is described in detail below in conjunction with the accompanying drawings.

[0031] A hydrogen fuel cell system power distribution operation process, such as Figure 1 As shown, it includes a hydrogen fuel cell stack 1, a power battery 12, a blower 16, a PTC 17, a step-down DC 18, a cooling fan 19, a water pump 20 and a power distribution system, and the power distribution system includes a stack discharge module 2, a main negative relay 4, a DC relay 1 5, a DC relay 2 6, a pre-charge resistor 7, a pre-charge relay 8, a power battery relay 9, a power battery fuse 11, a braking resistor 10, a device fuse 13, a PTC relay 14 and a step-down DC relay 15; the main negative relay 4 is used to connect or disconnect the battery stack output; the DC relay 1 5 and the DC relay 2 6 realize the on-off control of the DC input and output sides; the pre-charge resistor 7 is connected to the pre-charge circuit and can be pre-charged as needed. The resistance value of the pre-charging resistor 7 is selected according to the power properties of the electrical appliances to adjust the pre-charging current and pre-charge the device more reasonably and stably; pre-charging relay 8: realizes the on-off control of the pre-charging circuit; power battery relay 9: realizes the on-off control of the output and input main circuits of the power battery 12; power battery fuse 11: provides overcurrent protection for the power battery 12 to protect the power battery 12; braking resistor 10: to ensure the protection of the power battery 12 in abnormal emergencies, while changing the value of the braking resistor 10 to limit and control the current; PTC relay 14: realizes the on-off control of the input side of PTC17; step-down DC relay 15: realizes the on-off control of the input side of step-down DC18.

[0032] One side of the hydrogen fuel cell is provided with a current and voltage detector 3, by which the voltage and current data of the fuel cell stack are detected in real time, the PTC relay 14 is connected between the device fuse 13 and the PTC 17, the step-down DC relay 15 is connected between the device fuse 13 and the step-down DC 18, and the output end of the device fuse 13 is respectively connected to the power battery 12, the blower 16, the PTC 17 and the step-down DC 18.

[0033] Working principle: A current and voltage detector 3 is provided on one side of the hydrogen fuel cell, and the voltage and current values ​​of the hydrogen fuel cell stack 1 are detected in real time through the current and voltage detector 3. The on-off control of the DC input side and the DC output side of the hydrogen fuel cell stack 1 is realized through the DC relay 1 5 and the DC relay 2 6. When the power battery 12 is pre-charged, the on-off control of the output and input main circuits of the power battery 12 is realized through the power battery relay 9, and the on-off of the pre-charging circuit is controlled by the pre-charging relay 8. In the process of charging the power battery 12, the pre-charging resistor 7 arranged on the pre-charging circuit can select the resistance value of the pre-charging resistor 7 according to the power nature of the electrical appliance to be pre-charged, thereby adjusting the input of the pre-charging current, and pre-charging the device more reasonably and stably. A device fuse 13 is arranged between each device to provide overcurrent protection for each device, so as to have a better protection effect on each device. The hydrogen fuel cell consumes and discharges the residual voltage of the hydrogen fuel cell stack 1 through the stack discharge module 2 to ensure the safety of system power use.

[0034] At the beginning of system operation, the power battery 12 outputs energy to the outside to pre-charge the system devices. After the device pre-charging is completed, the system operates normally and the fuel cell generates electricity. When the outside of the system needs high power, the fuel cell and the power battery 12 work together to stably output energy to the outside. During the dynamic operation of the system, the system adjusts the stack load gear according to the SOC value of the power battery 12 and the power required by the periphery.

[0035] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A hydrogen fuel cell system power distribution operation process, including a hydrogen fuel cell stack, a power battery, a blower, a PTC, a step-down DC, a cooling fan, a water pump and a power distribution system, characterized in that: The power distribution system includes a stack discharge module, a main negative relay, a DC relay 1, a DC relay 2, a pre-charge resistor, a pre-charge relay, a power battery relay, a power battery fuse, a brake resistor, a device fuse, a PTC relay and a step-down DC relay; Main negative relay: used to connect or cut off the battery stack output; DC relay 1 and DC relay 2: realize on-off control of DC input and output sides; Pre-charge resistor: connected to the pre-charge circuit, the resistance value of the pre-charge resistor can be selected according to the power nature of the electrical appliance to be pre-charged, so as to adjust the pre-charge current and pre-charge the device more reasonably and stably; Pre-charging relay: realizes the on-off control of the pre-charging circuit; Power battery relay: realizes the on-off control of the output and input main lines of the power battery; Power battery fuse: to provide overcurrent protection for the power battery to protect the power battery; Braking resistor: To protect the power battery in case of abnormal emergencies, the braking resistor value is changed to limit and control the current; PTC relay: realizes the on-off control of the PTC input side; Step-down DC relay: realizes the on-off control of the step-down DC input side.

2. A hydrogen fuel cell system power distribution operation process according to claim 1, characterized in that: One side of the hydrogen fuel cell is provided with a current and voltage detector.

3. The power distribution operation process of a hydrogen fuel cell system according to claim 1, characterized in that: The PTC relay is connected between the device fuse and the PTC, and the step-down DC relay is connected between the device fuse and the step-down DC. The pre-charging resistor and the pre-charging relay cooperate with the PTC relay and the step-down DC relay to complete the system device pre-charging function.

4. The power distribution operation process of a hydrogen fuel cell system according to claim 1, characterized in that: The output ends of the device fuse are respectively connected to the power battery, the blower, the PTC and the step-down DC.

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