A fuel cell power control method and system, a power system, and a vehicle

Abstract

The present invention relates to the field of fuel cell vehicles, and specifically to a fuel cell power control method and system, a power system, and a vehicle. The method divides the charge state of a power battery into a number of state intervals, and respectively sets a calculation method for the power battery output power and the fuel cell output power corresponding to each state interval; thereby ensuring that the fuel cell vehicle can output sufficient power, achieving efficient use of fuel cell energy and maintaining the power battery SOC within a certain range, thereby improving the energy utilization efficiency of the fuel cell vehicle and extending the service life of the fuel cell and the power battery.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell vehicles, and particularly to a fuel cell power control method and system, a power system, and a vehicle. Background Art

[0002] Fuel cell vehicles mainly use the parallel connection of fuel cells and power batteries as the energy output of the whole vehicle. To extend the service life of fuel cells, it is necessary to reduce the variable load degree of fuel cells. Currently, the commonly used solution is that the fuel cell provides the steady-state power demand of the vehicle, and the power battery provides the transient power demand of the vehicle. The power battery plays a role in peak shaving and valley filling, reducing the severe variable load degree of the fuel cell. To maintain the power performance of the fuel cell vehicle, it is necessary to keep the SOC (state of charge) of the power battery at a certain level and prevent overcharging from damaging the power battery; when the SOC of the power battery is low, the fuel cell needs to charge the power battery in time, and when the SOC of the power battery is high, the power battery needs to discharge in time.

[0003] In the prior art, the adopted solutions include: when the SOC of the power battery is lower than the target value, the fuel cell charges the power battery, and at the same time, the fuel cell also responds to the required power of the whole vehicle; when the SOC of the power battery is higher than the target value, the power battery and the fuel cell jointly follow the required power of the whole vehicle; when the power battery is at the target SOC, only the power of the fuel cell follows the required power of the whole vehicle. Moreover, the fuel cell outputs at a fixed power point within a period of time. When the required power of the whole vehicle is greater than the fixed-point power output of the fuel cell, the power battery discharges and outputs the remaining power; when the required power of the whole vehicle is less than the fixed-point power output of the fuel cell, the power battery charges and absorbs the remaining power. The energy management algorithm of the fuel cell vehicle in the above solutions can reduce the variable load degree of the fuel cell and ensure that the SOC of the power battery is within the target range, but the energy utilization efficiency of the fuel cell power system is low, resulting in waste of energy consumption. Summary of the Invention

[0004] In view of the technical defects and drawbacks existing in the prior art, embodiments of the present invention provide a fuel cell power control method and system, a power system, and a vehicle that overcome or at least partially solve the above problems. On the premise of ensuring that the fuel cell vehicle has sufficient power performance, the variable load degree of the fuel cell is reduced, and at the same time, the fuel cell vehicle has a high energy utilization efficiency.

[0005] As an aspect of an embodiment of the present invention, a fuel cell power control method is provided. The control method includes:

[0006] Dividing several state intervals according to the charge state of the power battery, and respectively setting calculation methods for the output power of the power battery and the output power of the fuel cell corresponding to each state interval;

[0007] Detect the state of charge of the power battery and determine the state interval;

[0008] Determine the output power of the power battery and the output power of the fuel cell through corresponding calculation methods.

[0009] Furthermore, the control method includes,

[0010] Set the division values of the state of charge as the first division value, the second division value, the third division value, the fourth division value, the fifth division value, and the sixth division value;

[0011] Divide the state interval of the state of charge of the power battery into the first state interval, the second state interval, the third state interval, the fourth state interval, the fifth state interval, the sixth state interval, and the seventh state interval through the division values,

[0012] The first state interval is the undercharged state interval from 0% to the first division value, the second state interval is the weak state interval from the first division value to the second division value, the third state interval is the sub-healthy level interval from the second division value to the third division value, the fourth state interval is the healthy level interval from the third division value to the fourth division value, the fifth state interval is the saturated level interval from the fourth division value to the fifth division value, the sixth state interval is the oversaturated level interval from the fifth division value to the sixth division value, and the seventh state interval is the overcharge prevention level interval from the sixth division value to 100%.

[0013] Furthermore, the first division value is set to 10 - 15%, the second division value is set to 15 - 25%, the third division value is set to 25 - 50%, the fourth division value is set to 50 - 70%, the fifth division value is set to 70 - 80%, and the sixth division value is set to 80 - 90%.

[0014] Furthermore, the control method includes determining the output power of the power battery and the output power of the fuel cell according to the vehicle demand power, the fuel cell rated power, the power corresponding to the highest point of the fuel cell efficiency, the efficiency corresponding to the actual operation of the fuel cell, and the highest efficiency of the fuel cell.

[0015] Furthermore, the control method includes,

[0016] When the state of charge of the power battery is in the first state interval, the fuel cell outputs power at the rated power to charge the power battery, and the power output of the power battery is stopped;

[0017] When the state of charge of the power battery is in the second state interval, the fuel cell outputs power at the rated power to charge the power battery, and the power output of the power battery is determined according to the rated power of the fuel cell and the vehicle demand power;

[0018] When the state of charge of the power battery is in the third state interval, adjust the output power of the fuel cell for charging and the output power of the power battery according to the efficiency corresponding to the actual operation of the fuel cell;

[0019] When the state of charge of the power battery is in the fourth state interval, determine whether the fuel cell is at the highest efficiency point. If so, charge the power battery. If not, the fuel cell follows the vehicle demand power;

[0020] When the state of charge of the power battery is in the fifth state interval, the fuel cell stops charging the power battery and follows the vehicle demand power. The output power of the power battery is determined according to the output power of the fuel cell and the vehicle demand power;

[0021] When the state of charge of the power battery is in the sixth state interval, limit the output power of the fuel cell to be less than the vehicle demand power according to the efficiency corresponding to the actual operation of the fuel cell, and the power battery discharges;

[0022] When the state of charge of the power battery is in the seventh state interval, the fuel cell stops outputting power, and the power battery only outputs power and stops charging.

[0023] Furthermore, the control method includes,

[0024] When the state of charge of the power battery is in the first state interval, the output power of the fuel cell is: P FC = P FCreted , and the output power of the power battery is: P BAT = 0;

[0025] When the state of charge of the power battery is in the second state interval, the output power of the fuel cell is: P FC = P FCreted , and the output power of the power battery is: P BAT = P FCrated - P Veh ;

[0026] When the state of charge of the power battery is in the third state interval, the output power of the fuel cell is: P FC = P Veh - P BAT , and the output power of the power battery is: P BAT = -λ 1 ·λ 2 ·(P FCrated - P Veh ), where λ 2 is determined according to the current state of charge value and the division value of the state interval.

[0027] When the state of charge of the power battery is in the fourth state interval, the output power of the fuel cell is: The output power of the power battery is: P BAT = P FC - P Veh ;

[0028] When the state of charge of the power battery is in the fifth state interval, the output power of the fuel cell is: P FC = P Veh , and the output power of the power battery is: P BAT = P FC - P Veh ;

[0029] When the state of charge of the power battery is in the sixth state interval, the output power of the fuel cell is: P FC = λ 3 ·λ 4 ·P Veh , where λ 4 is determined according to the current state of charge value and the division value in the state interval, and the output power of the power battery is: P BAT = P Veh - P FC ;

[0030] When the state of charge of the power battery is in the seventh state interval, the output power of the fuel cell is: P FC = 0, and the output power of the power battery is: P BAT = P Veh ;

[0031] Among them, P FC is the output power of the fuel cell; P BAT is the output power of the power battery; P FCrated is the rated power of the fuel cell; P Veh is the vehicle demand power, is the power corresponding to the highest efficiency point of the fuel cell; is the efficiency corresponding to the actual operation of the fuel cell, and η max is the highest efficiency of the fuel cell.

[0032] Furthermore, the calculation method of the said λ 2 is (the third division value - the current state of charge value) / (the third division value - the second division value); the calculation method of the said λ 4 is (the fifth division value - the current state of charge value) / (the sixth division value - the fifth division value).

[0033] As another aspect of the embodiment of the present invention, a fuel cell power control system is provided. The fuel cell power control system includes,

[0034] A preset module for dividing a plurality of state intervals according to the charge state of a power battery, and respectively setting calculation methods for the output power of the power battery and the output power of a fuel cell corresponding to each of the state intervals;

[0035] A detection module for detecting the charge state of the power battery and determining the state interval;

[0036] A calculation module for determining the output power of the power battery and the output power of the fuel cell through corresponding calculation methods.

[0037] As another aspect of an embodiment of the present invention, a power system is provided. The power system includes a fuel cell, a DC chopper, a power battery, an inverter, and a motor. The fuel cell, the DC chopper, the inverter, and the motor are connected in sequence. The fuel cell is connected in parallel with the power battery. The fuel cell and the power battery are controlled by the fuel cell power control system as described in the above embodiment.

[0038] As another aspect of an embodiment of the present invention, a vehicle is provided. The vehicle controls the power system by the fuel cell power control method as described in any one of the above embodiments, or the vehicle includes the power system as described in the above embodiment.

[0039] The embodiments of the present invention at least achieve at least the following technical effects:

[0040] In the embodiments of the present invention, by dividing the charge state of the power battery into a plurality of state intervals and respectively setting calculation methods for the output power of the power battery and the output power of the fuel cell corresponding to each of the state intervals, it is ensured that the fuel cell vehicle can output sufficient power, realizing efficient utilization of fuel cell energy and taking into account maintaining the power battery SOC within a certain range, improving the energy utilization efficiency of the fuel cell vehicle, and extending the service life of the fuel cell and the power battery.

[0041] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures described in the written specification and the drawings, etc.

[0042] The technical solutions of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0043] The drawings are used to provide further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0044] Figure 1Flowchart of a fuel cell power control method according to an embodiment of the present invention;

[0045] Figure 2 Schematic diagram of the division of the state of charge of the power battery according to an embodiment of the present invention;

[0046] Figure 3 Flowchart of a fuel cell power control method according to another embodiment of the present invention;

[0047] Figure 4 Schematic diagram of a fuel cell power control system according to an embodiment of the present invention;

[0048] Figure 5 Schematic diagram of a power system according to an embodiment of the present invention. Detailed implementation manners

[0049] To describe in detail the technical content, achieved objectives and effects of the present invention, the following is described in conjunction with the embodiments and accompanied by the drawings.

[0050] The accompanying drawings and the following description depict alternative embodiments of the present invention to teach those skilled in the art how to implement and reproduce the present invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the technical solutions of the present invention. Those skilled in the art should understand that variations or substitutions derived from these embodiments will fall within the protection scope of the present invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the present invention. Thus, the present invention is not limited to the following alternative embodiments, but is only defined by the claims and their equivalents.

[0051] In one embodiment, as Figure 1 shown, a fuel cell power control method is provided, and the control method includes,

[0052] S11 Divide several state intervals according to the state of charge of the power battery, and respectively set the calculation methods for the output power of the power battery and the output power of the fuel cell corresponding to each state interval;

[0053] S12 Detect the state of charge of the power battery and determine the state interval;

[0054] S13 Determine the output power of the power battery and the output power of the fuel cell through the corresponding calculation methods.

[0055] In this embodiment, the state of charge (SOC) of the power battery is divided, different calculation methods for the output power of the power battery and the output power of the fuel cell are set for each state interval, and the fuel cell power is controlled according to the vehicle demand power and the power battery SOC according to the proposed calculation methods, realizing the control logic of fuel cell energy management.

[0056] In one embodiment, referring to the attached Figure 2 As shown, the control method includes

[0057] Setting the division values of the charge state to a first division value, a second division value, a third division value, a fourth division value, a fifth division value, and a sixth division value;

[0058] Dividing the state interval of the charge state of the power battery into a first state interval, a second state interval, a third state interval, a fourth state interval, a fifth state interval, a sixth state interval, and a seventh state interval by the division values

[0059] The first state interval is a discharged state interval from 0% to the first division value, the second state interval is a weak state interval from the first division value to the second division value, the third state interval is a sub-healthy level interval from the second division value to the third division value, the fourth state interval is a healthy level interval from the third division value to the fourth division value, the fifth state interval is a saturated level interval from the fourth division value to the fifth division value, the sixth state interval is an over-saturated level interval from the fifth division value to the sixth division value, and the seventh state interval is an overcharge prevention level interval from the sixth division value to 100%.

[0060] In this embodiment, the charge state is divided into 7 intervals, which can be divided in different proportions according to the conditions of different power batteries, or evenly distributed, and can be adjusted according to specific conditions.

[0061] In one embodiment, considering the overall power of the power battery and the fuel cell, the first division value is set to 10 - 15%, the second division value is set to 15 - 25%, the third division value is set to 25 - 50%, the fourth division value is set to 50 - 70%, the fifth division value is set to 70 - 80%, and the sixth division value is set to 80 - 90%. In this embodiment, the power consumption utilization rate can be more effectively improved. The first division value can be set to 10%, 12%, 15%; the second division value can be 15%, 20%, 25%; the third division value can be 25%, 30%, 40%, 50%; the fourth division value can be 50%, 60%, 70%; the fifth division value can be 70%, 75%, 80%; the sixth division value can be 80%, 85%, 90%.

[0062] In one embodiment, the control method includes determining the output power of the power battery and the output power of the fuel cell respectively according to the vehicle demand power, the rated power of the fuel cell, the power corresponding to the highest point of the fuel cell efficiency, the efficiency corresponding to the actual operation of the fuel cell, and the highest efficiency of the fuel cell. The vehicle demand power and the rated power of the fuel cell in this embodiment are inherent parameters and can be directly obtained. The power corresponding to the highest point of the fuel cell efficiency, the efficiency corresponding to the actual operation of the fuel cell, and the highest efficiency of the fuel cell can be obtained by referring to the relevant charts obtained from the test of the fuel cell, or can be directly converted by storing the corresponding data into the system before operation when needed.

[0063] In one embodiment, the control method includes respectively defining each state interval level of the power battery SOC, which is divided into 7 segments, and the definition of each segment is as follows:

[0064] When the state of charge of the power battery is in the first state interval, the fuel cell outputs the rated power to charge the power battery, and the power output of the power battery is stopped; in the first state interval, the power battery SOC is in a discharged state. To prevent over-discharge of the power battery, the power battery no longer outputs power, realizing self-protection of the power battery.

[0065] When the state of charge of the power battery is in the second state interval, the fuel cell outputs the rated power to charge the power battery, and the power output of the power battery is determined according to the rated power of the fuel cell and the vehicle demand power; in the second state interval, the power battery SOC is in a weak state, and the fuel cell needs to charge to the second set value level as soon as possible to ensure that the power system can output the maximum requested power for a period of time.

[0066] When the state of charge of the power battery is in the third state interval, the output power of the fuel cell for charging and the output power of the power battery are adjusted according to the efficiency corresponding to the actual operation of the fuel cell; in the third state interval, the power battery SOC is in a sub-healthy state, so that the fuel cell charges more when it is in the high-efficiency area and less when it is in the low-efficiency area, to realize the efficient utilization of the energy of the power system.

[0067] When the state of charge of the power battery is in the fourth state interval, it is determined whether the fuel cell is at the highest efficiency point. If so, the power battery is charged. If not, the fuel cell follows the vehicle demand power; the power battery SOC is maintained at a healthy level, and the fuel cell only charges the power battery when it is at the highest efficiency point, and follows the vehicle demand power in other cases.

[0068] When the state of charge of the power battery is in the fifth state interval, the fuel cell stops charging the power battery. Following the vehicle demand power, the output power of the power battery is determined according to the output power of the fuel cell and the vehicle demand power; the SOC of the power battery is at a saturated level, and the fuel cell does not charge the power battery and only follows the vehicle power.

[0069] When the state of charge of the power battery is in the sixth state interval, the output power of the fuel cell is limited according to the efficiency corresponding to the actual operation of the fuel cell and is less than the vehicle demand power, and the power battery discharges; the SOC of the power battery is at an oversaturated level, and the fuel cell will no longer follow the vehicle power and is always less than the vehicle power, causing the power battery to actively discharge.

[0070] When the state of charge of the power battery is in the seventh state interval, the fuel cell stops outputting power, and the power battery only outputs power and stops charging. This can prevent irreversible losses of the power battery caused by overcharging. The power battery only outputs power and no longer performs energy recovery, realizing self - protection of the power battery.

[0071] In this embodiment, to maintain the power performance of the fuel cell vehicle and keep the SOC of the power battery within a certain range, different control logics are set in different state intervals, and thus the calculation formula can be further determined.

[0072] In one embodiment, as Figure 3 described, the control method includes

[0073] S200 Start the control method;

[0074] S201 Detect and obtain the SOC of the power battery in real time;

[0075] S202 Determine whether the state of charge of the power battery is in the first state interval. If so, go to S203; if not, go to S205;

[0076] S203 Prohibit the power battery from discharging;

[0077] S204 The output power of the fuel cell is: P FC =P FCreted The output power of the power battery is: P BAT =0;

[0078] S205 Determine whether the state of charge of the power battery is in the second state interval. If so, go to S206; if not, go to S208;

[0079] S206 Start the maximum - power charging mode;

[0080] S207 The output power of the fuel cell is: P FC =P FCreted, the output power of the power battery is: P BAT = P FCrated - P Veh ;

[0081] S208 determines whether the charge state of the power battery is in the third state interval. If so, it proceeds to S209; if not, it proceeds to S211;

[0082] S209 activates the economic charging mode;

[0083] The output power of the fuel cell in S210 is: P FC = P Veh - P BAT , the output power of the power battery is: P BAT =-λ 1 ·λ 2 ·(P FCrated - P Veh ), where λ 2 is determined according to the current charge state value and the division value of the state interval.

[0084] S211 determines whether the charge state of the power battery is in the fourth state interval. If so, it proceeds to S212; if not, it proceeds to S214;

[0085] S212 activates the highest economic point charging or following the vehicle power mode;

[0086] The output power of the fuel cell in S213 is: The output power of the power battery is: P BAT = P FC - P Veh ;

[0087] S214 determines whether the charge state of the power battery is in the fifth state interval. If so, it proceeds to S215; if not, it proceeds to S217;

[0088] S215 activates following the vehicle power, and the power battery is freely balanced;

[0089] The output power of the fuel cell in S216 is: P FC = P Veh , the output power of the power battery is: P BAT = P FC - P Veh ;

[0090] S217 determines whether the charge state of the power battery is in the sixth state interval. If so, it proceeds to S218; if not, it proceeds to S220;

[0091] S218 activates limiting the fuel cell power and economic discharging;

[0092] The output power of the fuel cell in S219 is: P FC = λ 3 ·λ 4 ·P Veh , where λ 4 is determined according to the current charge state value and the division value in the state interval. The output power of the power battery is: P BAT = P Veh - P FC ;

[0093] S220 activates the power battery to prohibit the charging method;

[0094] The output power of the fuel cell in S221 is: P FC = 0, and the output power of the power battery is: P BAT = P Veh ;

[0095] S222 ends.

[0096] Among them, P FC is the output power of the fuel cell; P BAT is the output power of the power battery; P FCrated is the rated power of the fuel cell; P Veh is the vehicle demand power, is the power corresponding to the highest point of the fuel cell efficiency; is the efficiency corresponding to the actual operation of the fuel cell, η max is the highest efficiency of the fuel cell.

[0097] Preferably, the calculation method of the said λ 2 is (the third division value - the current charge state value) / (the third division value - the second division value); the calculation method of the said λ 4 is (the fifth division value - the current charge state value) / (the sixth division value - the fifth division value).

[0098] Based on the same inventive concept, in an embodiment, as Figure 4 shown, a fuel cell power control system is provided. The fuel cell power control system includes,

[0099] A preset module 11, configured to divide several state intervals according to the charge state of the power battery, and respectively set the calculation methods of the output power of the power battery and the fuel cell corresponding to each said state interval;

[0100] A detection module 12, configured to detect the charge state of the power battery and determine the state interval;

[0101] A calculation module 13 is configured to determine the output power of the power battery and the output power of the fuel cell through corresponding calculation methods.

[0102] Based on the same inventive concept, as Figure 5 shown, in one embodiment, a power system is provided. The power system includes a fuel cell 21, a DC chopper (DCDC) 22, a power battery 23, an inverter 24, and a motor 25. The fuel cell, the DC chopper, the inverter, and the motor are connected in sequence. The fuel cell is connected in parallel with the power battery. The fuel cell and the power battery are controlled by the fuel cell power control system as described in the above embodiment.

[0103] In this embodiment, the variable load condition of the fuel cell 21 will shorten its working life. Therefore, the power loading slope of the fuel cell is often small, and only provides steady-state power output. To meet the instantaneous power demand of the vehicle, the fuel cell and the power battery are connected in parallel to jointly provide power for the vehicle drive motor. When the power of the fuel cell does not meet the power demand of the vehicle, the remaining power request is provided by the power battery.

[0104] Based on the same inventive concept, in one embodiment, a vehicle is provided. The vehicle controls the power system through the fuel cell power control method as described in any one of the above embodiments, or the vehicle includes the power system as described in any one of the above embodiments.

[0105] The ordinal terms used in the description and claims, such as "first", "second", etc., are used to modify the corresponding elements. They do not mean that the element has any ordinal number in itself, nor do they represent the order of one element and another element. The use of these ordinal numbers is only to clearly distinguish an element with a certain name from another element with the same name.

[0106] Similarly, it should be understood that, in order to streamline the present invention and help understand one or more of the various inventive aspects, in the above description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present invention should not be construed as reflecting the intention that the claimed invention requires more features than those expressly recited in each claim. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, where each claim itself is a separate embodiment of the present invention.

[0107] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. A fuel cell power control method, characterized in that, the control method includes dividing a plurality of state intervals according to the state of charge of the power battery, and respectively setting calculation methods for the output power of the power battery and the output power of the fuel cell corresponding to each state interval; detecting the state of charge of the power battery to determine the state interval; determining the output power of the power battery and the output power of the fuel cell through the corresponding calculation methods; wherein, the control method includes setting the division values of the state of charge as the first division value, the second division value, the third division value, the fourth division value, the fifth division value, and the sixth division value; dividing the state intervals of the state of charge of the power battery into the first state interval, the second state interval, the third state interval, the fourth state interval, the fifth state interval, the sixth state interval, and the seventh state interval through the division values. The first state interval is a power deficit state interval from 0% to the first division value, the second state interval is a weak state interval from the first division value to the second division value, the third state interval is a sub-healthy level interval from the second division value to the third division value, the fourth state interval is a healthy level interval from the third division value to the fourth division value, the fifth state interval is a saturation level interval from the fourth division value to the fifth division value, the sixth state interval is an over-saturation level interval from the fifth division value to the sixth division value, and the seventh state interval is an overcharge prevention level interval from the sixth division value to 100%; wherein, the control method includes that when the state of charge of the power battery is in the first state interval, the fuel cell output power is the rated power to charge the power battery, and the power output of the power battery is stopped; when the state of charge of the power battery is in the second state interval, the fuel cell output power is the rated power to charge the power battery, and the power output of the power battery is determined according to the rated power of the fuel cell and the vehicle demand power; when the state of charge of the power battery is in the third state interval, the output power of the fuel cell for charging and the output power of the power battery are adjusted according to the efficiency corresponding to the actual operation of the fuel cell; when the state of charge of the power battery is in the fourth state interval, it is determined whether the fuel cell is at the highest efficiency point. If so, the power battery is charged. If not, the fuel cell follows the vehicle demand power; when the state of charge of the power battery is in the fifth state interval, the fuel cell stops charging the power battery and follows the vehicle demand power, and the power output of the power battery is determined according to the fuel cell output power and the vehicle demand power; when the state of charge of the power battery is in the sixth state interval, the output power of the fuel cell is limited to be less than the vehicle demand power according to the efficiency corresponding to the actual operation of the fuel cell, and the power battery discharges; when the state of charge of the power battery is in the seventh state interval, the fuel cell stops outputting power, the power battery only outputs power, and charging stops; Among them, the control method includes that when the state of charge of the power battery is in the first state interval, the output power of the fuel cell is: P FC = P FCreted , and the output power of the power battery is: P BAT = 0; When the state of charge of the power battery is in the second state interval, the output power of the fuel cell is: P FC = P FCreted , and the output power of the power battery is: P BAT = P FCrated - P Veh ; When the state of charge of the power battery is in the third state interval, the output power of the fuel cell is: P FC = P Veh - P BAT , the output power of the power battery is: PBAT = -λ1·λ2·(P FCrated - P Veh ), where λ2 is determined according to the current state of charge value and the division value in the state interval; when the state of charge of the power battery is in the fourth state interval, the fuel cell output power is: The output power of the power battery is: P BAT = P FC- P Veh ; When the state of charge of the power battery is in the fifth state interval, the output power of the fuel cell is: P FC = P Veh , and the output power of the power battery is: P BAT = P FC - P Veh ; when the state of charge of the power battery is in the sixth state interval, the fuel cell output power is: P FC = λ3·λ4·P Veh , where λ4 is determined according to the current charge state value and the division value in the state interval, and the output power of the power battery is: P BAT = P Veh - P FC ; When the state of charge of the power battery is in the seventh state interval, the output power of the fuel cell is: P FC = 0, and the output power of the power battery is: P BAT = P Veh ; Among them, P FC is the output power of the fuel cell; P BAT is the output power of the power battery; P FCrated is the rated power of the fuel cell; P Veh is the vehicle demand power, is the power corresponding to the highest point of the fuel cell efficiency; η PFC is the efficiency corresponding to the actual operation of the fuel cell, η max is the maximum efficiency of the fuel cell.

2. The fuel cell power control method according to claim 1, It is characterized in that the first division value is set to 10-15%, the second division value is set to 15-25%, the third division value is set to 25-50%, the fourth division value is set to 50-70%, the fifth division value is set to 70-80%, and the sixth division value is set to 80-90%.

3. The fuel cell power control method according to claim 2, It is characterized in that the control method includes determining the output power of the power battery and the output power of the fuel cell according to the vehicle demand power, the fuel cell rated power, the power corresponding to the highest point of the fuel cell efficiency, the efficiency corresponding to the actual operation of the fuel cell, and the highest efficiency of the fuel cell.

4. The fuel cell power control method according to claim 3, It is characterized in that the calculation method of λ2 is (the third division value - the current charge state value) / (the third division value - the second division value); the calculation method of λ4 is (the fifth division value - the current charge state value) / (the sixth division value - the fifth division value).

5. A fuel cell power control system, It is characterized in that the fuel cell power control system is based on the fuel cell power control method according to any one of claims 1-4. The fuel cell power control system includes a preset module for dividing a plurality of state intervals according to the charge state of the power battery and respectively setting the calculation methods of the output power of the power battery and the output power of the fuel cell corresponding to each state interval; a detection module for detecting the charge state of the power battery and determining the state interval; a calculation module for determining the output power of the power battery and the output power of the fuel cell through the corresponding calculation methods.

6. A power system, It is characterized in that the power system includes a fuel cell, a DC chopper, a power battery, an inverter and a motor. The fuel cell, the DC chopper, the inverter and the motor are connected in sequence. The fuel cell is connected in parallel with the power battery. The fuel cell and the power battery are controlled by the fuel cell power control system according to claim 5.

7. A vehicle, It is characterized in that the vehicle controls the power system by the fuel cell power control method according to any one of claims 1-4, or the vehicle includes the power system according to claim 6.

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