Fuel cell vehicle activation method, device, fuel cell and vehicle

Abstract

The present invention provides a method, device, fuel cell and vehicle for activating a fuel cell vehicle. The method for activating a fuel cell vehicle includes: in response to a command for the system to enter an activation mode, controlling the fuel cell to stop working, controlling the water pump to continue running, and controlling the power battery to provide the required power; when the power battery is discharged to a first power setting value, controlling the fuel cell to work at a high electrical density, and the fuel cell provides the required power while charging the power battery; when the power is charged to a second power setting value, controlling the fuel cell to stop working, controlling the water pump to continue running, and controlling the power battery to provide the required power, and the second power setting value is greater than the first power setting value. The purpose of preventing the proton exchange membrane from drying out and improving the efficiency of the stack and the durability of the proton exchange membrane is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of new energy technology, and in particular relates to a fuel cell vehicle activation method, device, fuel cell and vehicle. Background Art

[0002] The matching of the fuel cell humidifier takes into account the comprehensive operating conditions of the fuel cell. Once the humidifier is finalized, the humidification capacity of the humidifier at each operating point is certain and cannot be reasonably adjusted as the operating conditions change.

[0003] When a fuel cell vehicle operates at low electrical density for a long time due to special purposes or road conditions, the water production of the fuel cell stack is relatively small and the humidification capacity of the humidifier is limited. This can easily cause the membrane to dry out, resulting in low efficiency of the fuel cell stack and affecting the durability of the vehicle.

[0004] The current vehicle power control strategy does not consider special strategy processing based on the health status of the proton exchange membrane, resulting in no corresponding strategy adjustment to improve the membrane drying situation when the membrane dries up. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a fuel cell vehicle activation method, device, fuel cell and vehicle, which at least partially solve the problem of proton exchange membrane drying caused by fuel cell engine running at low current density for a long time in the prior art.

[0006] In a first aspect, an embodiment of the present disclosure provides a method for activating a fuel cell vehicle, comprising:

[0007] In response to the system entering the activation mode instruction, the fuel cell is controlled to stop working, the water pump is controlled to continue running, and the power battery is controlled to provide the required power;

[0008] When the power battery is discharged to a first power setting value, the fuel cell is controlled to operate at a high power density, and the fuel cell provides the required power while charging the power battery;

[0009] When the power is charged to a second power setting value, the fuel cell is controlled to stop working, the water pump is controlled to continue running, and the power battery is controlled to provide the required power. The second power setting value is greater than the first power setting value.

[0010] Optionally, the step of responding to the system entering the activation mode instruction includes:

[0011] Determine whether the continuous operation time of the fuel cell at low power density exceeds the set time;

[0012] When the fuel cell continuously operates at low power density for more than the set time, it is determined whether the high frequency impedance of the fuel cell exceeds the set upper limit R1;

[0013] If the high-frequency impedance exceeds the set upper limit R1, the system is sent a command to enter the activation mode.

[0014] Optionally, when the power is charged to the second power setting value, it is determined whether the high-frequency impedance of the fuel cell is within a setting range. If the high-frequency impedance of the fuel cell is within the setting range, the activation mode is exited.

[0015] Optionally, in response to the system entering the activation mode instruction, the method includes acquiring the frequency of the fuel cell entering the activation mode, and sending an alarm signal when the frequency of the fuel cell entering the activation mode is greater than a set frequency.

[0016] Optionally, the first power setting value is a minimum allowable SOC value of the power battery, and the second power setting value is a maximum allowable SOC value of the power battery.

[0017] In a second aspect, the present disclosure also provides a fuel cell vehicle activation device, comprising:

[0018] A control module, used to control the fuel cell to stop working, control the water pump to continue running, and control the power battery to provide required power in response to the system entering the activation mode instruction;

[0019] A first power judgment module is used to control the fuel cell to work at a high power density when the power battery is discharged to a first power setting value, so that the fuel cell provides the required power while charging the power battery;

[0020] The second power judgment module is used to control the fuel cell to stop working, control the water pump to continue running, and control the power battery to provide required power when the power is charged to a second power setting value, and the second power setting value is greater than the first power setting value.

[0021] Optionally, the second power judgment module is also used to judge whether the high-frequency impedance of the fuel cell is within a set range when the power is charged to the second power setting value. If the high-frequency impedance of the fuel cell is within the set range, the activation mode is exited.

[0022] Optionally, in response to the system entering the activation mode instruction, the method includes acquiring the frequency of the fuel cell entering the activation mode, and sending an alarm signal when the frequency of the fuel cell entering the activation mode is greater than a set frequency.

[0023] In a third aspect, the embodiments of the present disclosure further provide a fuel cell, using any of the fuel cell vehicle activation methods described in the first aspect.

[0024] In a fourth aspect, an embodiment of the present disclosure further provides a vehicle, using any of the fuel cell vehicle activation methods described in the first aspect.

[0025] The present invention provides a fuel cell vehicle activation method, device, fuel cell and vehicle. The fuel cell vehicle activation method, when the vehicle enters the activation mode, first controls the power battery to supply power, controls the fuel cell to stop working, and when the power battery reaches the set value, controls the fuel cell to work at high power density, and charges the power battery, so that the power battery and the fuel cell in the high power density working mode alternately provide the required power of the vehicle, avoiding the fuel cell from operating at low power density for a long time. Thereby achieving the purpose of preventing the proton exchange membrane from drying out, improving the efficiency of the stack and the durability of the proton exchange membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0027] Figure 1 A flow chart of a fuel cell vehicle activation method provided in an embodiment of the present disclosure;

[0028] Figure 2 This is a principle block diagram of the fuel cell vehicle activation device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0030] It should be clear that the following embodiments of the present disclosure are described by specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0031] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0032] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0033] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0034] Proton exchange membrane fuel cells must have enough water to maintain high proton conductivity. The commonly used humidification method is to use an external humidifier to achieve water balance management in most working areas of the fuel cell.

[0035] During the development of fuel cells, the high-frequency AC impedance of the stack is measured and calibrated. Usually, the high-frequency impedance has a reasonable range, and the high-frequency impedance is used as an indicator of the water content of the stack and the dryness and wetness of the proton exchange membrane.

[0036] The operating conditions of the fuel cell system after being assembled in the vehicle are mainly determined by the system energy management strategy based on the vehicle's power demand and SOC status.

[0037] like Figure 1 As shown, this embodiment discloses a method for activating a fuel cell vehicle, comprising:

[0038] In response to the system entering the activation mode instruction, the fuel cell is controlled to stop working, the water pump is controlled to continue running, and the power battery is controlled to provide the required power;

[0039] When the power battery is discharged to a first power setting value, the fuel cell is controlled to operate at a high power density, and the fuel cell provides the required power while charging the power battery;

[0040] When the power is charged to a second power setting value, the fuel cell is controlled to stop working, the water pump is controlled to continue running, and the power battery is controlled to provide the required power. The second power setting value is greater than the first power setting value.

[0041] Optionally, the step of responding to the system entering the activation mode instruction includes:

[0042] Determine whether the continuous operation time of the fuel cell at low power density exceeds the set time;

[0043] When the fuel cell continuously operates at low power density for more than the set time, it is determined whether the high frequency impedance of the fuel cell exceeds the set upper limit R1;

[0044] If the high-frequency impedance exceeds the set upper limit R1, the system is sent a command to enter the activation mode.

[0045] Optionally, when the power is charged to the second power setting value, it is determined whether the high-frequency impedance of the fuel cell is within a setting range. If the high-frequency impedance of the fuel cell is within the setting range, the activation mode is exited.

[0046] Optionally, in response to the system entering the activation mode instruction, the method includes acquiring the frequency of the fuel cell entering the activation mode, and sending an alarm signal when the frequency of the fuel cell entering the activation mode is greater than a set frequency.

[0047] Optionally, the first power setting value is a minimum allowable SOC value of the power battery, and the second power setting value is a maximum allowable SOC value of the power battery.

[0048] In a specific example, the fuel cell controller system counts the low-density point operation time. When the cumulative operation time of the low-density point exceeds N, and the high-frequency impedance measured by the system exceeds the upper limit of the normal range R1, the system triggers the activation strategy and enters the activation mode. At this time, the fuel cell stops working (the water pump continues to work to enhance the humidity of the proton exchange membrane). At this time, the power demand from the whole vehicle is provided by the power battery. When the power battery consumes less than SOC1 (SOC1 can be set separately according to the activation mode), the power battery stops providing power. At this time, the fuel cell operating condition is adjusted to the high-density point condition. In addition to meeting the power demand of the whole vehicle, the power battery is charged at the same time. When the power battery power is greater than SOC2, the fuel cell stops working, and the power demand from the whole vehicle is provided by the power battery. Repeated cycle operation, when the high-frequency impedance returns to normal, the activation strategy mode exits. When the activation frequency exceeds the set value f, a vehicle alarm signal needs to be issued for manual prompting. At this time, it is necessary to manually analyze the vehicle status to see if there are other faults that cause the membrane to dry, or to evaluate whether the humidifier needs to be re-matched.

[0049] This embodiment improves the dry condition of the proton exchange membrane during long-term operation at low current density, thereby increasing the humidity of the proton exchange membrane, improving the proton conductivity, and enhancing the performance of the fuel cell stack and the durability of the proton exchange membrane.

[0050] like Figure 2 The present embodiment also discloses a fuel cell vehicle activation device, comprising:

[0051] A control module, used to control the fuel cell to stop working, control the water pump to continue running, and control the power battery to provide required power in response to the system entering the activation mode instruction;

[0052] A first power judgment module is used to control the fuel cell to work at a high power density when the power battery is discharged to a first power setting value, so that the fuel cell provides the required power while charging the power battery;

[0053] The second power judgment module is used to control the fuel cell to stop working, control the water pump to continue running, and control the power battery to provide required power when the power is charged to a second power setting value, and the second power setting value is greater than the first power setting value.

[0054] Optionally, the second power judgment module is also used to judge whether the high-frequency impedance of the fuel cell is within a set range when the power is charged to the second power setting value. If the high-frequency impedance of the fuel cell is within the set range, the activation mode is exited.

[0055] Optionally, in response to the system entering the activation mode instruction, the method includes acquiring the frequency of the fuel cell entering the activation mode, and sending an alarm signal when the frequency of the fuel cell entering the activation mode is greater than a set frequency.

[0056] This embodiment also discloses a fuel cell, and uses the fuel cell vehicle activation method disclosed in this embodiment.

[0057] This embodiment also discloses a vehicle, which uses the fuel cell vehicle activation method disclosed in this embodiment.

[0058] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0059] In the present disclosure, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. The block diagrams of the devices, devices, equipment, and systems involved in the present disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0060] Additionally, as used herein, "or" used in a list of items beginning with "at least one" indicates a separate list, so that, for example, a list of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word "exemplary" does not mean that the example described is preferred or better than other examples.

[0061] It should also be noted that in the system and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0062] Various changes, substitutions, and modifications of the techniques described herein may be made without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of the present disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and actions described above. Currently existing or later to be developed processes, machines, manufactures, compositions of events, means, methods, or actions that perform substantially the same functions or achieve substantially the same results as the corresponding aspects described herein may be utilized. Thus, the appended claims include such processes, machines, manufactures, compositions of events, means, methods, or actions within their scope.

[0063] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0064] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A fuel cell vehicle activation method, characterized in that: include: Determine whether the continuous operation time of the fuel cell at low power density exceeds the set time; When the fuel cell continuously operates at low power density for more than the set time, it is determined whether the high frequency impedance of the fuel cell exceeds the set upper limit R1; If the high-frequency impedance exceeds the set upper limit R1, the system is sent a command to enter the activation mode; In response to the system entering the activation mode instruction, the fuel cell is controlled to stop working, the water pump is controlled to continue running, and the power battery is controlled to provide the required power; When the power battery is discharged to a first power setting value, the fuel cell is controlled to operate at a high power density, and the fuel cell provides the required power while charging the power battery; When the power is charged to a second power setting value, the fuel cell is controlled to stop working, the water pump is controlled to continue running, and the power battery is controlled to provide the required power. The second power setting value is greater than the first power setting value.

2. The method for activating a fuel cell vehicle according to claim 1, characterized in that: When the power is charged to the second power setting value, it is determined whether the high frequency impedance of the fuel cell is within the setting range. If the high frequency impedance of the fuel cell is within the setting range, the activation mode is exited.

3. The method for activating a fuel cell vehicle according to claim 1, characterized in that: Responding to the system entering the activation mode instruction includes obtaining the frequency of the fuel cell entering the activation mode, and sending an alarm signal when the frequency of the fuel cell entering the activation mode is greater than the set frequency.

4. The method for activating a fuel cell vehicle according to claim 1, characterized in that: The first power setting value is the minimum allowable SOC value of the power battery, and the second power setting value is the maximum allowable SOC value of the power battery.

5. A fuel cell vehicle activation device for implementing the method of claim 1, characterized in that: include: A control module, used to control the fuel cell to stop working, control the water pump to continue running, and control the power battery to provide required power in response to the system entering the activation mode instruction; A first power judgment module is used to control the fuel cell to work at a high power density when the power battery is discharged to a first power setting value, so that the fuel cell provides the required power while charging the power battery; The second power judgment module is used to control the fuel cell to stop working, control the water pump to continue running, and control the power battery to provide required power when the power is charged to a second power setting value, and the second power setting value is greater than the first power setting value.

6. The fuel cell vehicle activation device according to claim 5, characterized in that: The second power judgment module is also used to judge whether the high-frequency impedance of the fuel cell is within the set range when the power is charged to the second power setting value. If the high-frequency impedance of the fuel cell is within the set range, the activation mode is exited.

7. The fuel cell vehicle activation device according to claim 5, characterized in that: Responding to the system entering the activation mode instruction includes obtaining the frequency of the fuel cell entering the activation mode, and sending an alarm signal when the frequency of the fuel cell entering the activation mode is greater than the set frequency.

8. A fuel cell, characterized in that: A fuel cell vehicle activation method according to any one of claims 1 to 4 is used.

9. A vehicle, characterized in that: A fuel cell vehicle activation method according to any one of claims 1 to 4 is used.

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