Shutdown purging method and device, vehicle and medium

Abstract

The invention relates to the technical field of fuel cells, in particular to a shutdown purging method and device, a vehicle and a medium, and the shutdown purging method comprises the following steps: S1, threshold setting: setting shutdown duration T1 and purging temperature Temp1 of a fuel cell; s2, shutdown judgment: if the fuel cell receives a shutdown command, directly shutting down the fuel cell, and executing the step S3; otherwise, repeating the step S2; s3, data acquisition: timing the time length T after shutdown by the controller, and reading the temperature Temp of the cooling liquid; s4, performing purging judgment: if T is greater than or equal to T1 or Temp1 is less than or equal to Temp1, performing purging; otherwise, returning to the step S3; the device is simple in structural design, easy and convenient to operate, high in safety, good in purging effect, capable of saving energy and high in economical efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a shutdown purge method, device, vehicle and medium. Background Art

[0002] A large amount of water is produced during the electrochemical reaction inside the fuel cell, so it needs to be purged during shutdown. If it is parked for a long time without being purged, the internal water will accumulate in the mass transfer channel of the reaction gas due to gravity, and at low temperatures, the internal water will freeze and block the mass transfer channel of the reaction gas or burst the proton exchange membrane, causing problems such as slow startup or startup failure next time.

[0003] At present, the purging method uses immediate purging during the shutdown process. If the fuel cell is restarted within a short period of time after shutdown, the purging will be ineffective, wasting hydrogen and electricity, which reduces the economic efficiency. At the same time, the existing purging device mainly uses an air compressor to purge the cathode side of the stack. The air compressor requires high voltage electricity to start, which is cumbersome to operate and has certain risks. In addition, fuel cell vehicles generally disconnect the high voltage power supply after parking, and the purging is not performed during the shutdown process, resulting in the inability to perform purging before the vehicle is restarted due to the lack of high voltage power supply. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a shutdown purge method, device, vehicle and medium with simple structural design, easy operation, high safety, good purge effect, energy saving and high economy.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a shutdown purging method, comprising the following steps:

[0006] S1, threshold setting: preset fuel cell shutdown time T1 and purge temperature Temp1;

[0007] S2, shutdown judgment: if the fuel cell receives a shutdown command, it is directly shut down and step S3 is executed; otherwise, step S2 is repeated;

[0008] S3, data acquisition: the controller counts the time T after shutdown and reads the coolant temperature Temp;

[0009] S4, purge judgment: if T≥T1 or Temp≤Temp1, perform purge; otherwise, return to step S3.

[0010] Further, the purging process in step S4 is as follows:

[0011] The controller opens the air purge assembly to purge the cathode side of the fuel cell stack, and simultaneously opens the hydrogen purge assembly to purge the anode side of the fuel cell stack.

[0012] Furthermore, the purge duration in step S4 is T2.

[0013] A shutdown purge device executes the above-mentioned shutdown purge method to purge the fuel cell stack, comprising an air purge component, a hydrogen purge component and a controller, wherein the air purge component is connected to the cathode side of the fuel cell stack, the hydrogen purge component is connected to the anode side of the fuel cell stack, the controller is connected to the air purge component and the hydrogen purge component respectively, and the controller is powered by a low-voltage power supply.

[0014] Furthermore, the air purge assembly includes a vehicle-mounted compressed air bottle, a first air intake pipeline and a first pressure reducing valve. The vehicle-mounted compressed air bottle is connected to the cathode side of the fuel cell stack through the first air intake pipeline. The first pressure reducing valve is installed on the first air intake pipeline and connected to the controller.

[0015] Furthermore, the hydrogen purge assembly includes a vehicle-mounted compressed hydrogen cylinder, a second air intake pipeline, a second pressure reducing valve and a hydrogen injector. The vehicle-mounted compressed hydrogen cylinder is connected to the anode side of the fuel cell stack through the second air intake pipeline. The second pressure reducing valve and the hydrogen injector are both installed on the second air intake pipeline. The second pressure reducing valve is arranged on the right side of the hydrogen injector. The second pressure reducing valve and the hydrogen injector are respectively connected to the controller.

[0016] Furthermore, it also includes an exhaust component, which includes a mixing chamber, an exhaust pipeline and a tail exhaust throttle. The mixing chamber is connected to the fuel cell stack through the exhaust pipeline. The tail exhaust throttle is installed on the exhaust pipeline and connected to the controller.

[0017] Furthermore, the mixing chamber is connected to the fuel cell stack through a connecting pipe.

[0018] A vehicle comprises a memory, a processor and a computer program. The computer program is stored in the memory and runs on the processor. When the processor executes the computer program, the shutdown purging method mentioned above is implemented.

[0019] A medium stores a computer program, and when the computer program is executed, the shutdown purge method is implemented.

[0020] The beneficial effects of the present invention are:

[0021] (1) The present invention monitors the shutdown time and coolant temperature through a controller, and compares the acquired shutdown time and coolant temperature with the corresponding threshold values, and then determines whether to perform purging. Compared with the immediate purging during the shutdown process, it avoids the ineffective purging caused by restarting within a short period of time after shutdown, and further avoids the energy consumption and performance degradation caused by multiple cold purging in winter, saves energy and improves economy, and has a better purging effect. At the same time, it ensures that the battery stack is not damaged and can be started normally.

[0022] (2) The present invention retains a low-voltage power supply. When the low-voltage power supply is turned on, the cathode side of the fuel cell stack is purged by an additional vehicle-mounted compressed air bottle. Compared with purging with an air compressor, no high-voltage electricity or starting of the air compressor is required, which is easy to operate and safer. At the same time, it ensures that purging can still be performed without a high-voltage power supply before the vehicle is restarted. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a flow chart of the shutdown purging method of the present invention;

[0025] Figure 2 It is a schematic diagram of the shutdown purge device in the present invention.

[0026] In the figure: 10, battery stack; 20, air purge assembly; 21, vehicle-mounted compressed air bottle; 22, first air intake line; 23, first pressure reducing valve; 30, hydrogen purge assembly; 31, vehicle-mounted compressed hydrogen bottle; 32, second air intake line; 33, second pressure reducing valve; 34, hydrogen injector; 40, controller; 51, mixing chamber; 52, exhaust line; 53, tail exhaust throttle; 60, connecting line. DETAILED DESCRIPTION

[0027] The present invention will now be further described in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0028] Example 1

[0029] like Figure 1 As shown, a shutdown purging method comprises the following steps:

[0030] S1. Threshold setting: presetting the fuel cell shutdown time T1 and the purge temperature Temp1. The shutdown time T1 and the purge temperature Temp1 are obtained from test data or modeling calculations.

[0031] S2. Shutdown judgment: If the fuel cell receives a shutdown command, it is directly shut down and executes step S3; otherwise, repeat step S2.

[0032] S3, data acquisition: the controller 40 counts the shutdown time T and reads the coolant temperature Temp.

[0033] S4, purge determination: if T≥T1 or Temp≤Temp1, purge is performed; otherwise, return to step S3. The purge duration is T2, which is obtained by test data or modeling calculation.

[0034] The controller 40 monitors the shutdown time T and the coolant temperature Temp, and compares the acquired shutdown time T and coolant temperature Temp with the corresponding preset thresholds, and then determines whether to perform purging. Compared with the immediate purging during the shutdown process, it avoids the ineffective purging caused by restarting within a short time after shutdown, thereby avoiding the energy consumption and performance degradation caused by multiple cold purging in winter, saving energy and improving economy, and achieving better purging effect, while ensuring that the battery stack 10 is not damaged and can be started normally.

[0035] The purge process in step S4 is as follows:

[0036] The controller 40 opens the air purge assembly 20 to purge the cathode side of the fuel cell stack 10 , and opens the hydrogen purge assembly 30 to purge the anode side of the fuel cell stack 10 .

[0037] Example 2

[0038] like Figure 2 As shown, a shutdown purge device executes the shutdown purge method described in Example 1 to purge the fuel cell stack 10, including an air purge component 20, a hydrogen purge component 30 and a controller 40. The air purge component 20 is connected to the cathode side of the fuel cell stack 10, the hydrogen purge component 30 is connected to the anode side of the fuel cell stack 10, and the controller 40 is connected to the air purge component 20 and the hydrogen purge component 30 respectively. The controller 40 is powered by a low-voltage power supply.

[0039] The air purge assembly 20 includes a vehicle-mounted compressed air bottle 21, a first air intake pipe 22 and a first pressure reducing valve 23. The vehicle-mounted compressed air bottle 21 is connected to the cathode side of the fuel cell stack 10 through the first air intake pipe 22. The first pressure reducing valve 23 is installed on the first air intake pipe 22 and connected to the controller 40.

[0040] The present application retains the vehicle's low-voltage power supply. When the low-voltage power supply is turned on, the cathode side of the fuel cell stack 10 is purged through the installed on-board compressed air bottle 21. Compared with purging with an air compressor, no high-voltage electricity or starting of the air compressor is required, which is easy to operate and safer. At the same time, it ensures that purging can still be performed without high-voltage power supply before the vehicle is restarted.

[0041] The hydrogen purge assembly 30 includes an on-board compressed hydrogen cylinder 31, a second air intake pipeline 32, a second pressure reducing valve 33 and a hydrogen injector 34. The on-board compressed hydrogen cylinder 31 is connected to the anode side of the fuel cell stack 10 through the second air intake pipeline 32. The second pressure reducing valve 33 and the hydrogen injector 34 are both installed on the second air intake pipeline 32. The second pressure reducing valve 33 is arranged on the right side of the hydrogen injector 34. The second pressure reducing valve 33 and the hydrogen injector 34 are respectively connected to the controller 40.

[0042] The shutdown purge device also includes an exhaust assembly, which includes a mixing chamber 51, an exhaust pipeline 52 and a tail exhaust throttle 53. The mixing chamber 51 is connected to the fuel cell stack 10 through the exhaust pipeline 52. The tail exhaust throttle 53 is installed on the exhaust pipeline 52 and connected to the controller 40. Specifically, the mixing chamber 51 is connected to the fuel cell stack 10 through a connecting pipeline 60.

[0043] During purging, the controller 40 opens the on-board compressed air bottle 21, the first pressure reducing valve 23, the on-board compressed hydrogen bottle 31, the second pressure reducing valve 33, the hydrogen injector 34 and the tail exhaust throttle 53. The air in the on-board compressed air bottle 21 enters the cathode side of the fuel cell stack 10 through the first air intake pipe 22 for purging. The hydrogen in the on-board compressed hydrogen bottle 31 enters the anode side of the fuel cell stack 10 through the second air intake pipe 32 by the hydrogen injector 34 for purging. The purged liquid, air and hydrogen enter the mixing chamber 51 through the exhaust pipe 52 for mixing and dilution, and are finally discharged into the atmosphere.

[0044] Example 3

[0045] A vehicle includes a memory, a processor and a computer program. The computer program is stored in the memory and runs on the processor. When the processor executes the computer program, the shutdown purging method described in Example 1 is implemented.

[0046] Example 4

[0047] A medium having a computer program stored thereon, which, when executed, implements the shutdown purging method described in Example 1.

[0048] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A shutdown purging method, characterized in that: The steps include: S1, threshold setting: preset fuel cell shutdown time T1 and purge temperature Temp1; S2, shutdown judgment: if the fuel cell receives a shutdown command, it is directly shut down and step S3 is executed; otherwise, step S2 is repeated; S3, data acquisition: the controller (40) counts the time T after shutdown and reads the coolant temperature Temp; S4, purge judgment: if T≥T1 or Temp≤Temp1, perform purge; otherwise, return to step S3.

2. The shutdown purging method according to claim 1, characterized in that: The purging process in step S4 is as follows: The controller (40) opens the air purge component (20) to purge the cathode side of the fuel cell stack (10), and simultaneously opens the hydrogen purge component (30) to purge the anode side of the fuel cell stack (10).

3. The shutdown purging method according to claim 1, characterized in that: The purge duration in step S4 is T2.

4. A shutdown purge device, which executes the shutdown purge method according to any one of claims 1 to 3 to purge a fuel cell stack (10), characterized in that: The invention comprises an air purge component (20), a hydrogen purge component (30) and a controller (40), wherein the air purge component (20) is connected to the cathode side of the fuel cell stack (10), the hydrogen purge component (30) is connected to the anode side of the fuel cell stack (10), the controller (40) is connected to the air purge component (20) and the hydrogen purge component (30), respectively, and the controller (40) is powered by a low-voltage power supply.

5. The shutdown purge device according to claim 4, characterized in that: The air purge assembly (20) comprises a vehicle-mounted compressed air bottle (21), a first air intake pipeline (22) and a first pressure reducing valve (23); the vehicle-mounted compressed air bottle (21) is connected to the cathode side of the fuel cell stack (10) via the first air intake pipeline (22); the first pressure reducing valve (23) is installed on the first air intake pipeline (22) and is connected to a controller (40).

6. The shutdown purge device according to claim 4, characterized in that: The hydrogen purge assembly (30) comprises an on-board compressed hydrogen cylinder (31), a second air intake pipeline (32), a second pressure reducing valve (33) and a hydrogen injector (34); the on-board compressed hydrogen cylinder (31) is connected to the anode side of the fuel cell stack (10) via the second air intake pipeline (32); the second pressure reducing valve (33) and the hydrogen injector (34) are both installed on the second air intake pipeline (32); the second pressure reducing valve (33) is arranged on the right side of the hydrogen injector (34); and the second pressure reducing valve (33) and the hydrogen injector (34) are respectively connected to a controller (40).

7. The shutdown purge device according to claim 4, characterized in that: The invention also includes an exhaust component, which includes a mixing chamber (51), an exhaust pipeline (52) and a tail exhaust throttle (53). The mixing chamber (51) is connected to the fuel cell stack (10) through the exhaust pipeline (52). The tail exhaust throttle (53) is installed on the exhaust pipeline (52) and connected to the controller (40).

8. The shutdown purge device according to claim 7, characterized in that: The mixing chamber (51) is in communication with the fuel cell stack (10) via a communication pipeline (60).

9. A vehicle comprising a memory, a processor and a computer program, wherein the computer program is stored in the memory and runs on the processor, characterized in that: When the processor executes the computer program, the shutdown purge method described in any one of claims 1-3 is implemented.

10. A medium having a computer program stored thereon, characterized in that: When the computer program is executed, the shutdown purge method according to any one of claims 1 to 3 is implemented.

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