Power distribution system, method, medium, device and vehicle for fuel cell vehicle

Abstract

The present disclosure relates to a power distribution system, method, medium, device and vehicle of a fuel cell vehicle to solve the problem of low output capacity of a DC converter, including: a fuel cell stack, a low-voltage battery, a fuel cell low-voltage load, a first DC converter connected between the fuel cell stack and the fuel cell low-voltage load, a second DC converter connected between the fuel cell stack and the low-voltage battery, and an isolation component connected between the low-voltage battery and the first DC converter; the isolation component can conduct the power supply circuit from the low-voltage battery to the fuel cell low-voltage load when the fuel cell vehicle is in the ON gear and the fuel cell stack is in a non-working state, so as to transmit the power provided by the low-voltage battery to the fuel cell low-voltage load, and when the fuel cell stack is in a working state, block the power provided by the fuel cell stack through the first DC converter to the low-voltage battery. In this way, the output capacity of the DC converter can be guaranteed.

Description

Technical Field

[0001] The present disclosure relates to the field of new energy vehicle engineering technology, and in particular, to a power distribution system, method, medium, device and vehicle of a fuel cell vehicle. Background Art

[0002] Fuel cells, as clean, efficient and pollution-free electrochemical power generation devices, are one of the development directions of new energy vehicles. The power that a fuel cell system can provide is much higher than the low-voltage load of a new energy vehicle and the power of the low-voltage load of the fuel cell. For example, the fuel cell system of a light truck logistics vehicle can provide a power of 30-50kW, the required power of the low-voltage load of the fuel cell is 1.2-1.5kW, and the required power of the low-voltage load of the vehicle is 2.0-2.5kW. For another example, the fuel cell system of a heavy truck tractor, dump truck, etc. can provide a power of 100-150kW, the required power of the low-voltage load of the fuel cell is 0.8-1.2kW, and the required power of the low-voltage load of the vehicle is 2-3kW. Therefore, it is necessary to isolate the fuel cell system from the low-voltage load through DC-DC.

[0003] In the related art, a DC-DC converter is formed by connecting multiple DC converters in parallel and configuring a current balancing module so that the load power is evenly distributed to each DC converter. Otherwise, uneven power will cause current imbalance, which may cause a single DC converter to overload, thereby causing the DC converter to burn out and the entire vehicle to be unable to operate normally. Summary of the invention

[0004] The purpose of the present disclosure is to provide a power distribution system, method, medium, device and vehicle for a fuel cell vehicle to solve the problem of low output capacity of a DC converter in the related art.

[0005] In order to achieve the above-mentioned object, the first aspect of the embodiment of the present disclosure provides a power distribution system for a fuel cell vehicle, comprising:

[0006] A fuel cell stack, a low-voltage battery, a fuel cell low-voltage load, a first DC converter connected between the fuel cell stack and the fuel cell low-voltage load, a second DC converter connected between the fuel cell stack and the low-voltage battery, and an isolation component connected between the low-voltage battery and the first DC converter;

[0007] The isolation component can, when the fuel cell vehicle is in the ON gear and the fuel cell stack is in a non-working state, conduct the power supply circuit from the low-voltage battery to the fuel cell low-voltage load so as to transmit the power provided by the low-voltage battery to the fuel cell low-voltage load, and when the fuel cell stack is in a working state, block the power provided by the fuel cell stack through the first DC converter from being transmitted to the low-voltage battery.

[0008] Optionally, the isolation component includes a diode D;

[0009] The anode of the diode D is connected to the low-voltage battery, and the cathode of the diode D is connected to the first DC converter.

[0010] Optionally, the isolation component includes a relay K;

[0011] The power distribution system further includes a fuel cell controller FCU, and the coil of the relay K is connected to the fuel cell controller FCU;

[0012] The low-voltage battery is electrically connected to the first DC converter through the contacts of the relay K;

[0013] The fuel cell controller FCU is used to control the coil of the relay K to be energized when the fuel cell vehicle is in the ON gear and the fuel cell stack is in a non-working state, so that the power provided by the low-voltage battery is transmitted to the fuel cell low-voltage load through the contacts; and to control the coil of the relay K to be de-energized when the fuel cell stack is in a working state, so as to block the power provided by the first DC converter from being transmitted to the low-voltage battery.

[0014] Optionally, the power distribution system further comprises a power battery, wherein the power battery is electrically connected to the second DC converter, and the power battery is electrically connected to the first DC converter;

[0015] The fuel cell controller FCU is also used to obtain the battery charge state of the low-voltage battery and the status information of the second DC converter, and when the battery charge state meets a preset charging threshold and the status information indicates that the second DC converter is in a fault state, control the coil of the relay K to be energized so that the power provided by the first DC converter is transmitted to the low-voltage battery through the contacts.

[0016] In a second aspect of the embodiment of the present disclosure, there is provided a power distribution method for a fuel cell vehicle, which is applied to the fuel cell controller FCU of the power distribution system of the fuel cell vehicle in the first aspect, and the method comprises:

[0017] Acquiring vehicle status information of the fuel cell vehicle;

[0018] When the vehicle status information indicates that the fuel cell vehicle is in the ON gear state, obtaining the working status information of the fuel cell stack;

[0019] When the working state information indicates that the fuel cell stack is in a non-working state, the coil of the control relay K is energized so that the power provided by the low-voltage battery is transmitted to the fuel cell low-voltage load through the contacts of the relay K;

[0020] When the working state information indicates that the fuel cell stack is in working state, the coil of the relay K is controlled to be de-energized to block the power provided by the first DC converter from being transmitted to the low-voltage battery.

[0021] Optionally, the method further comprises:

[0022] Acquiring the battery charge state of the low-voltage battery and the state information of the second DC converter;

[0023] When it is determined that the battery charge state meets the preset charging threshold and the status information indicates that the second DC converter is in a fault state, the coil of the relay K is controlled to be energized so that the power provided by the first DC converter is transmitted to the low-voltage battery through the contacts.

[0024] In a third aspect of the present disclosure, there is provided a power distribution device for a fuel cell vehicle, the device comprising:

[0025] A first acquisition module, used to acquire the whole vehicle status information of the fuel cell vehicle;

[0026] A second acquisition module is used to acquire the working state information of the fuel cell stack when the vehicle state information indicates that the fuel cell vehicle is in the ON gear state;

[0027] A first control module is used to control the coil of the relay K to be energized when the working state information indicates that the fuel cell stack is in a non-working state, so that the power provided by the low-voltage battery is transmitted to the fuel cell low-voltage load through the contact of the relay K;

[0028] The second control module is used to control the coil of the relay K to be de-energized when the working status information indicates that the fuel cell stack is in a working state, so as to block the power provided by the first DC converter from being transmitted to the low-voltage battery.

[0029] Optionally, the first acquisition module is further used to acquire the battery charge state of the low-voltage battery and the state information of the second DC converter;

[0030] The second control module is also used to control the coil of the relay K to be energized when it is determined that the battery charge state meets a preset charging threshold and the status information indicates that the second DC converter is in a fault state, so that the power provided by the first DC converter is transmitted to the low-voltage battery through the contacts.

[0031] According to a fourth aspect of the embodiments of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the steps of the method described in the second aspect are implemented.

[0032] According to a fifth aspect of the present disclosure, a fuel cell controller is provided, comprising:

[0033] a memory having a computer program stored thereon;

[0034] A processor is used to execute the computer program in the memory to implement the steps of the method described in the second aspect.

[0035] According to a sixth aspect of the embodiments of the present disclosure, a vehicle is provided, comprising the fuel cell controller described in the fifth aspect or the system described in the first aspect.

[0036] The above technical solution can at least achieve the following technical effects:

[0037] Through the fuel cell stack, the low-voltage battery, the fuel cell low-voltage load, the first DC converter connected between the fuel cell stack and the fuel cell low-voltage load, the second DC converter connected between the fuel cell stack and the low-voltage battery, and the isolation component connected between the low-voltage battery and the first DC converter; the isolation component can conduct the power supply circuit from the low-voltage battery to the fuel cell low-voltage load when the fuel cell vehicle is in the ON gear and the fuel cell stack is in a non-working state, so as to transmit the power provided by the low-voltage battery to the fuel cell low-voltage load, and when the fuel cell stack is in a working state, block the power provided by the fuel cell stack through the first DC converter to the low-voltage battery. In this way, before the high-voltage power-on of the fuel cell stack, the fuel cell low-voltage load self-check and the vehicle low-voltage load operation can be completed based on the power provided by the low-voltage battery. After the high-voltage power-on of the fuel cell stack, the first DC converter and the second DC converter can work independently, so there is no need to set a current equalization module, and the first DC converter and the second DC converter working independently will not be limited by, for example, the parallel use of DC converters in the related art, avoiding the problem of reduced output power of the DC converter, thereby ensuring the output capacity of the DC converter.

[0038] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0040] Figure 1 The figure is a schematic diagram of current direction of a power distribution system of a fuel cell vehicle according to an exemplary embodiment.

[0041] Figure 2 is a schematic diagram of current direction of another power distribution system of a fuel cell vehicle according to an exemplary embodiment.

[0042] Figure 3 is a circuit diagram of a power distribution system of a fuel cell vehicle according to an exemplary embodiment.

[0043] Figure 4 is a circuit diagram of another power distribution system of a fuel cell vehicle according to an exemplary embodiment.

[0044] Figure 5 The present invention is a flow chart showing a power distribution method for a fuel cell vehicle according to an exemplary embodiment.

[0045] Figure 6 The present invention is a block diagram of a power distribution device of a fuel cell vehicle according to an exemplary embodiment.

[0046] Description of Reference Numerals

[0047] 100-Power distribution system of fuel cell vehicle 101-Fuel cell stack

[0048] 102- low voltage battery 103- fuel cell low voltage load

[0049] 104-first DC converter 105-second DC converter

[0050] 106-Isolation components 107-Power battery DETAILED DESCRIPTION

[0051] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0052] It should be noted that in the present disclosure, the terms "first", "second", etc. in the specification, claims and drawings are used to distinguish similar objects, and are not necessarily understood as describing a specific order or sequence. Similarly, the terms "S53", "S54", etc. are used to distinguish steps, and are not necessarily understood as executing method steps in a specific order or sequence.

[0053] Before introducing the power distribution system, method, medium, device and vehicle of the fuel cell vehicle provided by the present disclosure, the application scenario of the present disclosure is first introduced. The power distribution system of the fuel cell vehicle provided by the present disclosure can be applied to fuel cell vehicles, for example, hydrogen fuel cell vehicles.

[0054] The inventors have found that connecting multiple DC converters in parallel to form a DC-DC converter will weaken the output capacity of the DC-DC converter. For example, if a 1.5kW DC converter is connected in parallel with a 3kW DC converter, the power output by the DC converter will be less than 4.5kW.

[0055] In order to solve the above technical problems, the present disclosure provides a power distribution system for a fuel cell vehicle. Figure 1 FIG. 1 is a schematic diagram showing the current direction of a power distribution system of a fuel cell vehicle according to an exemplary embodiment. Figure 1 As shown, the power distribution system 100 of the fuel cell vehicle includes:

[0056] A fuel cell stack 101, a low-voltage battery 102, a fuel cell low-voltage load 103, a first DC converter 104 connected between the fuel cell stack 101 and the fuel cell low-voltage load 103, a second DC converter 105 connected between the fuel cell stack 101 and the low-voltage battery 102, and an isolation component 106 connected between the low-voltage battery 102 and the first DC converter 104;

[0057] The isolation component 106 can, when the fuel cell vehicle is in the ON gear and the fuel cell stack 101 is in a non-working state, conduct the power supply circuit from the low-voltage battery 102 to the fuel cell low-voltage load 103 to transmit the power provided by the low-voltage battery 102 to the fuel cell low-voltage load 103, and when the fuel cell stack 101 is in a working state, block the power provided by the fuel cell stack 101 through the first DC converter 104 from being transmitted to the low-voltage battery 102.

[0058] For specific implementation, see Figure 1As shown, the negative electrode of the low-voltage battery 102 is connected to the frame of the fuel cell vehicle, and the negative electrode of the fuel cell low-voltage load 103 is connected to the frame of the fuel cell vehicle. Optionally, the positive electrode of the low-voltage load of the whole vehicle is electrically connected to the positive electrode of the low-voltage battery 102, and the negative electrode of the low-voltage load of the whole vehicle is connected to the frame of the fuel cell vehicle. The low-voltage load of the whole vehicle can realize the corresponding function based on the power provided by the low-voltage battery 102.

[0059] The positive pole of the high-line bus of the fuel cell stack 101 is connected to the positive pole of the first DC converter 104, the negative pole of the high-line bus of the fuel cell stack 101 is connected to the negative pole of the first DC converter 104, the positive pole of the high-line bus of the fuel cell stack 101 is connected to the positive pole of the second DC converter 105, and the negative pole of the high-line bus of the fuel cell stack 101 is connected to the negative pole of the second DC converter 105.

[0060] Optionally, the first DC converter 104 is a 1.5 kW DC converter, which is arranged in the fuel cell controller FCU, and the second DC converter 105 is a 3 kW DC converter, which is arranged in the power distribution unit PDU (Power Distribution Unit).

[0061] Optionally, the fuel cell stack 101 and the fuel cell controller FCU, and the power distribution unit PDU and the fuel cell controller FCU are connected via a high-voltage connector HV; the low-voltage battery 102 and the fuel cell controller FCU, the fuel cell low-voltage load 103 and the fuel cell controller FCU, and the low-voltage battery 102 and the power distribution unit PDU are connected via a low-voltage connector LV.

[0062] For example, the positive pole of the high-voltage busbar of the fuel cell stack 101 is connected to the positive pole of the high-voltage input of the fuel cell controller FCU through the high-voltage connector HV+, and the negative pole of the high-voltage busbar of the fuel cell stack 101 is connected to the negative pole of the high-voltage input of the fuel cell controller FCU through the high-voltage connector HV-. The positive pole of the low-voltage battery 102 is connected to the power distribution unit PDU and the fuel cell controller FCU respectively through the low-voltage connector LV+.

[0063] Specifically, the fuel cell low-voltage load 103 may be a cooling device such as a water pump, or a fuel cell stack starting device, and the like.

[0064] refer to Figure 1The current directions shown in Ia and Ic, when the fuel cell vehicle is in the ON gear and the fuel cell stack 101 is in a non-working state, indicate that the fuel cell vehicle is powered on at a low voltage while the high voltage of the fuel cell stack 101 is not powered on. The fuel cell low-voltage load 103 performs self-inspection based on the power provided by the low-voltage battery 102, as shown in the current direction Ia. At this time, the power of the fuel cell low-voltage load 103 is relatively low, and the low-voltage load of the entire vehicle works based on the power provided by the low-voltage battery 102, as shown in the current direction Ic.

[0065] See also Figure 2 The current direction shown in Ib and Ic, when the fuel cell stack 101 is in working state, indicates that the fuel cell vehicle is in the state of high voltage power on of the fuel cell stack 101, a chemical reaction can occur, and power can be generated and provided to the first DC converter 104 and the second DC converter 105. Based on the power provided by the fuel cell stack 101, the first DC converter 104 converts the high voltage voltage into the low voltage DC power required by the fuel cell low voltage load 103 through DC step-down, and the fuel cell low voltage load 103 is cooled based on the low voltage DC power, etc., and the current direction shown in Ib, under normal circumstances, consumes a large amount of power at this time. The low voltage load of the whole vehicle works based on the power provided by the low voltage battery 102 or the power provided by the second DC converter 105, and the current direction shown in Id. In this way, the first DC converter 104 and the second DC converter 105 can work independently, so there is no need to set a current balancing module, and the first DC converter 104 and the second DC converter 105 working independently will not be limited by the parallel use of DC converters in the related art, for example, to avoid the problem of reduced output power of the DC converter.

[0066] The above system includes a fuel cell stack, a low-voltage battery, a fuel cell low-voltage load, a first DC converter connected between the fuel cell stack and the fuel cell low-voltage load, a second DC converter connected between the fuel cell stack and the low-voltage battery, and an isolation component connected between the low-voltage battery and the first DC converter; the isolation component can, when the fuel cell vehicle is in the ON gear and the fuel cell stack is in a non-working state, conduct the power supply circuit from the low-voltage battery to the fuel cell low-voltage load to transmit the power provided by the low-voltage battery to the fuel cell low-voltage load, and when the fuel cell stack is in a working state, block the power provided by the fuel cell stack through the first DC converter from being transmitted to the low-voltage battery. In this way, before the high voltage of the fuel cell stack is powered on, the low-voltage load self-inspection of the fuel cell and the low-voltage load operation of the whole vehicle can be completed based on the power provided by the low-voltage battery. After the high voltage of the fuel cell stack is powered on, the first DC converter and the second DC converter can work independently, so there is no need to set up a current equalization module, and the independently working first DC converter and second DC converter will not be subject to the limitations of the parallel use of DC converters in related technologies, such as this, thereby avoiding the problem of reduced output power of the DC converter, and thus ensuring the output capacity of the DC converter.

[0067] Furthermore, the stable operation of the DC converter can be ensured without setting a current balancing module, thereby reducing the manufacturing cost of the vehicle. The DC converter can be set separately, thereby improving the flexibility of the layout.

[0068] Optionally, refer to Figure 3 As shown, the isolation component 106 includes a diode D;

[0069] An anode of the diode D is connected to the low-voltage battery 102 , and a cathode of the diode D is connected to the first DC converter 104 .

[0070] Specifically, when the fuel cell vehicle is in the ON gear and the fuel cell stack 101 is in a non-operating state, since the first DC converter 104 is stopped, the power provided by the low-voltage battery 102 is transmitted to the fuel cell low-voltage load 103 through the anode and cathode of the diode.

[0071] When the fuel cell stack 101 is in operation, since the voltage rate of the first DC converter 104 is usually higher than the voltage of the low-voltage battery 102, the power provided by the first DC converter 104 cannot be transmitted to the low-voltage battery 102 through the cathode and anode of the diode. Therefore, the purpose of independent operation of the first DC converter 104 and the second DC converter 105 is achieved, and there is no need to set up a current balancing module.

[0072] Optionally, refer to Figure 4As shown, the isolation component 106 includes a relay K;

[0073] The power distribution system further includes a fuel cell controller FCU, and the coil of the relay K is connected to the fuel cell controller FCU;

[0074] The low-voltage battery 102 is electrically connected to the first DC converter 104 through the contacts of the relay K;

[0075] The fuel cell controller FCU is used to control the coil of the relay K to be energized when the fuel cell vehicle is in the ON gear and the fuel cell stack 101 is in a non-working state, so that the power provided by the low-voltage battery 102 is transmitted to the fuel cell low-voltage load 103 through the contacts; and to control the coil of the relay K to be de-energized when the fuel cell vehicle is in the ON gear and the fuel cell stack 101 is in a working state, so as to block the power provided by the first DC converter 104 from being transmitted to the low-voltage battery 102.

[0076] Specifically, when the fuel cell vehicle is in the ON gear and the fuel cell stack 101 is in a non-operating state, the fuel cell controller FCU determines whether it is necessary to perform self-test, preheating, etc. on the fuel cell low-voltage load 103 according to the vehicle control strategy. If it is necessary to perform self-test, preheating, etc. on the fuel cell low-voltage load 103, the coil of the control relay K is energized.

[0077] When the coil of relay K is energized, the contacts of relay K are energized, and the power of the low-voltage battery 102 can reach the fuel cell low-voltage load 103 along the power supply circuit. The fuel cell low-voltage load 103 performs self-inspection, preheating, etc. based on the power provided by the low-voltage battery 102.

[0078] When the fuel cell controller FCU determines that the fuel cell stack is in a working state based on the working state information of the fuel cell stack, it controls the coil of the relay K to cut off the power. At this time, the power supply circuit between the low-voltage battery 102 and the fuel cell low-voltage load 103 is disconnected, blocking the power transmission from the low-voltage battery 102 to the fuel cell low-voltage load 103, and blocking the power transmission from the fuel cell stack 101 through the first DC converter 104 to the low-voltage battery 102.

[0079] The above-mentioned system can complete the low-voltage load self-inspection of the fuel cell and the low-voltage load operation of the whole vehicle based on the power provided by the low-voltage battery before the high-voltage power-on of the fuel cell stack. After the high-voltage power-on of the fuel cell stack, the first DC converter and the second DC converter can work independently, so there is no need to set up a current equalization module, and the independently working first DC converter and second DC converter will not be subject to the limitations of the parallel use of DC converters in related technologies, such as avoiding the problem of reduced output power of the DC converter, thereby ensuring the output capacity of the DC converter.

[0080] Optionally, refer to Figure 4 As shown, the power distribution system further includes a power battery 107, the power battery 107 is electrically connected to the second DC converter 105, and the power battery 107 is electrically connected to the first DC converter 104;

[0081] The fuel cell controller FCU is also used to obtain the battery charge state of the low-voltage battery 102 and the status information of the second DC converter 105, and when the battery charge state meets the preset charging threshold and the status information indicates that the second DC converter 105 is in a fault state, control the coil of the relay K to be energized so that the power provided by the first DC converter 104 is transmitted to the low-voltage battery 102 through the contacts.

[0082] Specifically, the power battery 107 is connected to the power distribution unit PDU via a high voltage connector HV. When the second DC converter 105 is in a normal state, if the battery charge state of the low voltage battery 102 is lower than a preset charging threshold, the second DC converter 105 transmits the power provided by the power battery 107 to the low voltage battery 102 to charge the low voltage battery 102, and transmits the power provided by the power battery 107 to the low voltage load of the vehicle, so that the low voltage load of the vehicle works based on the power.

[0083] When the second DC converter 105 is in a faulty state, the second DC converter 105 cannot deliver the power provided by the power battery 107 to the low-voltage battery 102 and the low-voltage load of the vehicle. If the battery charge state of the low-voltage battery 102 is lower than the preset charging threshold, the fuel cell controller FCU controls the coil of the relay K to energize, and the first DC converter 104 delivers the power provided by the power battery 107 to the low-voltage battery 102, or delivers the power provided by the fuel cell stack 101 to the low-voltage battery 102, so as to charge the low-voltage battery 102, and the low-voltage battery 102 provides power to the low-voltage load of the vehicle.

[0084] By adopting the above system, even if the second DC converter 105 is in a fault state, the power supply of the low-voltage battery 102 can be guaranteed, thereby ensuring the stable operation of the entire vehicle and improving the stability of the use of the fuel cell vehicle.

[0085] The embodiment of the present disclosure also provides a power distribution method for a fuel cell vehicle, wherein the fuel cell controller FCU applied to the power distribution system of the fuel cell vehicle, Figure 5 1 is a flow chart showing a power distribution method for a fuel cell vehicle according to an exemplary embodiment, the method comprising:

[0086] S51, obtaining the whole vehicle status information of the fuel cell vehicle.

[0087] S52: When the vehicle status information indicates that the fuel cell vehicle is in the ON gear state, obtain the working status information of the fuel cell stack.

[0088] S53. When the working state information indicates that the fuel cell stack is in a non-working state, the coil of the control relay K is energized so that the power provided by the low-voltage battery is transmitted to the fuel cell low-voltage load through the contacts of the relay K.

[0089] S54. When the working status information indicates that the fuel cell stack is in working status, the coil of the relay K is controlled to be de-energized to prevent the power provided by the first DC converter from being transmitted to the low-voltage battery.

[0090] Specifically, the fuel cell controller FCU obtains vehicle status information, which may include ignition lock status information and working status information of the vehicle controller. Further, based on the ignition lock status information, it is determined whether the fuel cell vehicle is in an ignition state, and when the fuel cell vehicle is in the ignition state, it is determined whether the fuel cell vehicle is in the ON gear state based on the working status information of the vehicle controller.

[0091] Further, when the vehicle status information indicates that the fuel cell vehicle is in the ON gear state, the working status information of the fuel cell stack is obtained. When it is determined that the fuel cell stack is in the non-working state, it is determined whether it is necessary to perform self-test, preheating, etc. on the fuel cell low-voltage load 103 according to the control strategy of the vehicle controller. When it is necessary to perform self-test, preheating, etc. on the fuel cell low-voltage load 103, the coil of the control relay K is energized.

[0092] Furthermore, when the coil of relay K is energized, the contacts of relay K are energized, and the power of the low-voltage battery 102 can reach the fuel cell low-voltage load 103 along the power supply circuit. The fuel cell low-voltage load 103 performs self-inspection, preheating, etc. based on the power provided by the low-voltage battery 102.

[0093] Furthermore, when it is determined that the fuel cell stack is in a working state based on the working state information of the fuel cell stack, the coil of the control relay K is de-energized. At this time, the power supply circuit between the low-voltage battery 102 and the fuel cell low-voltage load 103 is disconnected, thereby blocking the power transmission from the low-voltage battery 102 to the fuel cell low-voltage load 103, and blocking the power transmission from the fuel cell stack 101 through the first DC converter 104 to the low-voltage battery 102.

[0094] The above technical solution can complete the fuel cell low-voltage load self-inspection and the low-voltage load operation of the whole vehicle based on the power provided by the low-voltage battery before the fuel cell stack is powered on with high voltage. After the fuel cell stack is powered on with high voltage, the first DC converter and the second DC converter can work independently, so there is no need to set up a current equalizing module, and the independently working first DC converter and second DC converter will not be restricted by the parallel use of DC converters in related technologies, thereby avoiding the problem of reduced output power of the DC converter, thereby ensuring the output capacity of the DC converter.

[0095] Optionally, the method further comprises:

[0096] Acquiring the battery charge state of the low-voltage battery and the state information of the second DC converter;

[0097] When it is determined that the battery charge state meets the preset charging threshold and the status information indicates that the second DC converter is in a fault state, the coil of the relay K is controlled to be energized so that the power provided by the first DC converter is transmitted to the low-voltage battery through the contacts.

[0098] Based on the same inventive concept, the present disclosure also provides a power distribution device 600 for a fuel cell vehicle, which is used to execute the steps of the power distribution method for a fuel cell vehicle provided in the above method embodiment. The device 600 can implement the video association method in the form of software, hardware, or a combination of both. Figure 6 is a block diagram of a power distribution device 600 for a fuel cell vehicle according to an exemplary embodiment. Figure 6 As shown, the device 600 includes: a first acquisition module 610 , a second acquisition module 620 , a first control module 630 and a second control module 640 .

[0099] Wherein, the first acquisition module 610 is used to acquire the vehicle status information of the fuel cell vehicle;

[0100] The second acquisition module 620 is used to acquire the working state information of the fuel cell stack 101 when the vehicle state information indicates that the fuel cell vehicle is in the ON gear state;

[0101] The first control module 630 is used to control the coil of the relay K to be energized when the working state information indicates that the fuel cell stack 101 is in a non-working state, so that the power provided by the low-voltage battery 102 is transmitted to the fuel cell low-voltage load 103 through the contacts of the relay K;

[0102] The second control module 640 is used to control the coil of the relay K to be de-energized so as to block the power provided by the first DC converter 104 from being transmitted to the low-voltage battery 102 when the working status information indicates that the fuel cell stack 101 is in a working state.

[0103] The above-mentioned device can complete the low-voltage load self-inspection of the fuel cell and the low-voltage load operation of the whole vehicle based on the power provided by the low-voltage battery before the high-voltage power-on of the fuel cell stack. After the high-voltage power-on of the fuel cell stack, the first DC converter and the second DC converter can work independently, so there is no need to set up a current equalization module, and the independently working first DC converter and second DC converter will not be subject to the limitations of the parallel use of DC converters in related technologies, such as avoiding the problem of reduced output power of the DC converter, thereby ensuring the output capacity of the DC converter.

[0104] Optionally, the first acquisition module 610 is further used to acquire the battery state of charge of the low-voltage battery and the state information of the second DC converter;

[0105] The second control module 640 is also used to control the coil of the relay K to be energized when it is determined that the battery charge state meets a preset charging threshold and the status information indicates that the second DC converter is in a fault state, so that the power provided by the first DC converter is transmitted to the low-voltage battery through the contacts.

[0106] Optionally, the power distribution device 600 of the fuel cell vehicle may also be provided in a power distribution unit PDU (Power Distribution Unit) of the fuel cell vehicle.

[0107] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0108] In addition, it is worth noting that for the convenience and simplicity of description, the embodiments described in the specification are all preferred embodiments, and the parts involved are not necessarily necessary for the present invention. For example, the first control module 630 and the second control module 640 can be independent devices or the same device in specific implementation, and the present disclosure does not limit this.

[0109] The present disclosure also provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the power distribution method for a fuel cell vehicle when the program is executed by a processor.

[0110] The present disclosure also provides a fuel cell controller FCU, comprising:

[0111] a memory having a computer program stored thereon;

[0112] A processor is used to execute the computer program in the memory to implement the steps of the power distribution method for a fuel cell vehicle.

[0113] The present disclosure also provides a vehicle, comprising the fuel cell controller FCU.

[0114] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0115] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0116] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A power distribution system for a fuel cell vehicle, characterized in that: include: A fuel cell stack (101), a low-voltage battery (102), a fuel cell low-voltage load (103), a first DC converter (104) connected between the fuel cell stack (101) and the fuel cell low-voltage load (103), a second DC converter (105) connected between the fuel cell stack (101) and the low-voltage battery (102), and an isolation component (106) connected between the low-voltage battery (102) and the first DC converter (104); The isolation component (106) is capable of conducting a power supply circuit from the low-voltage battery (102) to the fuel cell low-voltage load (103) when the fuel cell vehicle is in the ON gear and the fuel cell stack (101) is in a non-operating state, so as to transmit the power provided by the low-voltage battery (102) to the fuel cell low-voltage load (103), and blocking the power provided by the fuel cell stack (101) through the first DC converter (104) from being transmitted to the low-voltage battery (102) when the fuel cell stack (101) is in an operating state; Wherein, the isolation component (106) comprises a relay K; The power distribution system further includes a fuel cell controller FCU, and the coil of the relay K is connected to the fuel cell controller FCU; The low-voltage battery (102) is electrically connected to the first DC converter (104) via the contacts of the relay K; The fuel cell controller FCU is used to control the coil of the relay K to be energized when the fuel cell vehicle is in the ON gear and the fuel cell stack (101) is in a non-operating state, so that the power provided by the low-voltage battery (102) is transmitted to the fuel cell low-voltage load (103) through the contact, and to control the coil of the relay K to be de-energized when the fuel cell stack (101) is in an operating state, so as to block the power provided by the first DC converter (104) from being transmitted to the low-voltage battery (102); The fuel cell controller FCU is further used to obtain the battery charge state of the low-voltage battery (102) and the status information of the second DC converter (105), and, when the battery charge state meets a preset charging threshold and the status information indicates that the second DC converter (105) is in a fault state, control the coil of the relay K to be energized so that the power provided by the first DC converter (104) is transmitted to the low-voltage battery (102) through the contact.

2. The power distribution system according to claim 1, characterized in that: The power distribution system further comprises a power battery (107), wherein the power battery (107) is electrically connected to the second DC converter (105), and the power battery (107) is electrically connected to the first DC converter (104).

3. A power distribution method for a fuel cell vehicle, characterized in that: The fuel cell controller FCU applied to the power distribution system of the fuel cell vehicle of claim 1, the method comprising: Acquiring vehicle status information of the fuel cell vehicle; When the whole vehicle status information indicates that the fuel cell vehicle is in the ON gear state, obtaining the working status information of the fuel cell stack (101); When the working state information indicates that the fuel cell stack (101) is in a non-working state, the coil of the control relay K is energized so that the power provided by the low-voltage battery (102) is transmitted to the fuel cell low-voltage load (103) through the contacts of the relay K; When the working state information indicates that the fuel cell stack (101) is in a working state, controlling the coil of the relay K to be de-energized to block the transmission of power provided by the first DC converter (104) to the low-voltage battery (102); Acquiring the battery charge state of the low-voltage battery (102) and state information of the second DC converter (105); When it is determined that the battery charge state meets a preset charging threshold and the state information indicates that the second DC converter (105) is in a fault state, the coil of the relay K is controlled to be energized so that the power provided by the first DC converter (104) is transmitted to the low-voltage battery (102) through the contacts.

4. A power distribution device for a fuel cell vehicle, characterized in that: The fuel cell controller FCU applied to the power distribution system of the fuel cell vehicle according to claim 1, the device comprising: A first acquisition module, used to acquire the whole vehicle status information of the fuel cell vehicle; A second acquisition module, for acquiring working state information of the fuel cell stack (101) when the whole vehicle state information indicates that the fuel cell vehicle is in an ON gear state; A first control module is used to control the coil of the relay K to be energized when the working state information indicates that the fuel cell stack (101) is in a non-working state, so that the power provided by the low-voltage battery (102) is transmitted to the fuel cell low-voltage load (103) through the contacts of the relay K; a second control module, for controlling the coil of the relay K to be de-energized when the working state information indicates that the fuel cell stack (101) is in a working state, so as to block the transmission of power provided by the first DC converter (104) to the low-voltage battery (102); The first acquisition module is further used to acquire the battery charge state of the low-voltage battery (102) and the state information of the second DC converter (105); The second control module is further configured to control the coil of the relay K to be energized when it is determined that the battery charge state meets a preset charging threshold and the state information indicates that the second DC converter (105) is in a fault state, so that the power provided by the first DC converter (104) is transmitted to the low-voltage battery (102) through the contact.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to claim 3 are implemented.

6. A fuel cell controller, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to claim 3.

7. A vehicle, characterized in that: Includes the fuel cell controller described in claim 6 or the system described in any one of claims 1-2.

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