Fuel cell box purging system, purging method and vehicle

Abstract

The invention discloses a fuel cell box purging system, a purging method and a vehicle. The technical problem that in the prior art, a fuel cell system cannot purge a packaging box under the condition that the fuel cell system cannot be started is solved. The fuel cell box purging system comprises: a galvanic pile module comprising a box and a galvanic pile located in the box, the box being provided with a purging inlet and a purging outlet; the air supply pipeline is communicated with an air inlet of the electric pile; the discharge pipeline is communicated with the purging outlet; the purging pipeline comprises a standby air source and a three-way valve, one opening of the three-way valve is communicated with the purging inlet through a pipeline, and the other two openings of the three-way valve are respectively communicated with the air supply pipeline and the standby air source through pipelines. According to the purging system, the box body can be purged under the condition that the fuel cell cannot be started, and the safety of the vehicle is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of fuel cell box purging, and specifically relates to a fuel cell box purging system and purge method, and a vehicle. Background Art

[0002] The stack in the fuel cell system of a fuel cell vehicle will have a certain amount of fuel (usually hydrogen) leakage due to limitations such as materials, structure, and process, which will cause the fuel (usually hydrogen) to accumulate in the fuel cell packaging box. If it is parked for a long time, or repeatedly operated in high and low temperature environments, condensed water and water vapor will be generated on the surface of the stack core and the packaging box of the fuel cell system, causing the insulation resistance of the fuel cell system to decrease, causing the fuel cell system to suddenly shut down or affect the performance of the fuel cell vehicle to start, or even the serious consequence of being unable to start. Generally, positive pressure purging or negative pressure suction is used to reduce the risk of fuel (usually hydrogen) accumulation in the box, while reducing the humidity in the box.

[0003] In the related art, the source of the purge gas introduced in the positive pressure gas purge scheme is basically after the fuel cell system is started up. After the air provided by the air compressor is cooled by the intercooler, an air path branch is set to introduce part of the air cooled by the intercooler into the packaging box of the fuel cell, and the hydrogen accumulated in the packaging box is blown out to the tail exhaust pipe of the engine, and the hydrogen and water vapor inside the packaging box are taken away in real time. However, this technical solution requires that the fuel cell system be started up normally and the air compressor be operated normally before purging can be performed. If the fuel cell system cannot be started, the box cannot be purged. Summary of the invention

[0004] In order to solve the technical problem that the current fuel cell system cannot purge the packaging box when it cannot be started, the present application provides a fuel cell box purge system and purge method, and a vehicle.

[0005] In a first aspect of the present application, a fuel cell box purging device is provided, comprising:

[0006] A battery stack module, comprising a box and a battery stack located in the box, wherein the box is provided with a purge inlet and a purge outlet;

[0007] An air supply pipeline connected to the air inlet of the fuel cell stack;

[0008] a discharge pipeline connected to the purge outlet;

[0009] The purge pipeline includes a backup air source and a three-way valve, one opening of the three-way valve is connected to the purge inlet through a pipeline, and the other two openings of the three-way valve are connected to the air supply pipeline and the backup air source through pipelines respectively.

[0010] In some embodiments, the backup gas source is a pre-filled gas bottle and / or an air conditioning system, the pre-filled gas bottle is provided with a bottle valve, and the air conditioning system is provided with an opening and closing valve.

[0011] In some embodiments, the backup gas source includes the pre-filled gas bottle and the air conditioning system connected in parallel; the purge pipeline also includes a first one-way valve connected in series to the parallel branch corresponding to the air conditioning system.

[0012] In some embodiments, an opening of the three-way valve is connected to an air bearing purge outlet of an air compressor of the air supply line.

[0013] In some embodiments, the box body is provided with a moisture discharge port, the moisture discharge port is located at the bottom of the box body, and the purge outlet is located at the upper part of the box body;

[0014] The discharge pipeline includes a dehumidification pipe, an exhaust pipe, a mixed exhaust pipe and a second one-way valve. One end of the dehumidification pipe and the exhaust pipe are respectively connected to the dehumidification port and the purge outlet, and the other end is connected to the mixed exhaust pipe through the second one-way valve.

[0015] In a second aspect of the present application, a fuel cell box purge method is provided, which is implemented based on the fuel cell box purge system of the first aspect, and the purge method comprises:

[0016] Determine whether the insulation resistance value of the fuel cell is not less than the set resistance value;

[0017] When the insulation resistance value is not less than the set resistance value, the fuel cell is started, air is supplied to the stack module through the air supply pipeline, the three-way valve is controlled to conduct the air supply pipeline with the purge inlet, and purge gas is supplied to the box through the air supply pipeline until the fuel cell stops working;

[0018] When the insulation resistance value is less than the set resistance value, determine whether the hydrogen concentration in the box is greater than the first set concentration value, and whether the humidity in the box is greater than the first set humidity value. When the hydrogen concentration is greater than the first set concentration value, and / or the humidity is greater than the first set humidity value, control the three-way valve to connect the backup gas source to the purge inlet, and provide purge gas to the box through the backup gas source until the hydrogen concentration is not greater than the first set concentration value, and the humidity is not greater than the first set humidity value.

[0019] According to a third aspect of the present application, a vehicle is provided, comprising the fuel cell box purging device according to the first aspect.

[0020] A fourth aspect of the present application provides a fuel cell box purging method, which is implemented based on the vehicle of the third aspect, characterized in that the vehicle is provided with a power battery, and the backup gas source of the fuel cell box purging device includes the pre-filled gas bottle and the air conditioning system connected in parallel;

[0021] The purging method comprises:

[0022] Determine whether the insulation resistance value of the fuel cell is not less than the set resistance value;

[0023] When the insulation resistance value is not less than the set resistance value, the stack module is started, air is supplied to the stack module through the air supply pipeline, and the three-way valve is controlled to conduct the air supply pipeline with the purge inlet, and purge gas is supplied to the box through the air supply pipeline until the stack module stops working;

[0024] When the insulation resistance value is less than the set resistance value, it is determined whether the hydrogen concentration in the box is greater than the first set concentration value and whether the humidity in the box is greater than the first set humidity value; when the hydrogen concentration is greater than the first set concentration value and / or the humidity is greater than the first set humidity value, it is determined whether the power of the power battery is not less than the set power value. When the power is not less than the set power value, the three-way valve and the on-off valve are controlled to operate so that the air-conditioning system is connected to the purge inlet, and the purge gas is provided to the box through the air-conditioning system until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value; when the power is lower than the set power value, it is determined whether the gas pressure of the pre-filled gas bottle is greater than the set pressure value. When the gas pressure is greater than the set pressure value, the three-way valve and the bottle valve are controlled to operate so that the pre-filled gas bottle is connected to the purge inlet, and the purge gas is provided to the box through the pre-filled gas bottle until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value.

[0025] In some implementations, when the power is not less than a set power value, the purging method further includes:

[0026] Determine whether the hydrogen concentration is greater than a second set concentration value, whether the humidity is greater than a second set humidity value, and whether the gas pressure is greater than a set pressure value;

[0027] When the gas pressure is greater than the set pressure value, and when the hydrogen concentration is greater than the second set concentration value, and / or the humidity is greater than the second set humidity value, the three-way valve, the on-off valve and the bottle valve are controlled to operate so that the air-conditioning system and the pre-filled gas bottle are connected to the purge inlet, and purge gas is provided to the box through the air-conditioning system and the pre-filled gas bottle until the hydrogen concentration is no greater than the first set concentration value, and the humidity is no greater than the first set humidity value.

[0028] According to a fifth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the purging method according to the fourth aspect are implemented.

[0029] The fuel cell box purge device provided according to an embodiment of the present application includes a fuel cell stack module, an air supply pipeline, a purge pipeline, and an exhaust pipeline.

[0030] The purge line includes a backup air source and a three-way valve, one of the openings of the three-way valve is connected to the purge inlet through a pipeline, and the other two openings of the three-way valve are connected to the air supply line and the backup air source through pipelines, respectively. Therefore, the purge inlet can be switched to be connected to the air supply line and the backup air source, so that the air in the air supply line or the gas in the backup air source is sent to the gap between the box and the stack. When the box of the stack module needs to be purged, and the insulation resistance value is very low and cannot be started, the box can be purged through the backup air source, so that the fuel cell can be quickly restored and started. After the fuel cell is restored and started, the fuel cell box can be purged normally by relying on the air supply line, which improves the stability of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic structural diagram of a fuel cell box purge device in one or more embodiments of the present application is shown.

[0032] Figure 2 A schematic flow chart of a purging method in one embodiment of the present application is shown.

[0033] Figure 3 A schematic diagram of the backup gas source selection process of the present application is shown.

[0034] Description of reference numerals:

[0035] 10-air supply pipeline, 11-air filter, 12-air flow meter, 13-air compressor, 14-intercooler, 15-humidifier, 30-purge pipeline, 31-three-way valve, 32-first one-way valve, 33-backup air source, 331-pre-filled gas bottle, 332-air conditioning system, 40-fuel cell module, 41-box, 43-humidity sensor, 44-hydrogen concentration sensor, 70-discharge pipeline, 71-dehumidification pipe, 72-exhaust pipe, 73-second one-way valve, 74-mixed exhaust pipe. DETAILED DESCRIPTION

[0036] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0037] The first embodiment of the present application provides a fuel cell box purging device. When the fuel cell system cannot be started normally, the box can be purged with the help of a backup gas source to reduce the hydrogen concentration and humidity in the box, so that the fuel cell can be restarted.

[0038] See also Figure 1 The fuel cell box purge device provided in the present application includes a fuel cell stack module 40 , an air supply pipeline 10 , a purge pipeline 30 and an exhaust pipeline 70 .

[0039] The fuel cell stack module 40 includes a box body 41 and a fuel cell stack located in the box body 41. The box body 41 is actually a packaging box body 41 for the fuel cell stack. Hydrogen and water vapor will be distributed in the gap between the fuel cell stack and the box body 41. The box body 41 is provided with a purge inlet and a purge outlet. Both the purge inlet and the purge outlet are connected to the gap between the fuel cell stack and the box body 41, so that the purge gas can enter the gap between the fuel cell stack and the box body 41 from the purge inlet, and the purge gas can be discharged along the purge outlet with the hydrogen and water vapor.

[0040] The air supply pipeline 10 is connected to the air inlet of the stack to supply the air required for the reaction to the stack module 40. Of course, in order for the stack module 40 to react normally, a hydrogen supply pipeline will also be connected to the hydrogen inlet of the stack. In order to cool the stack module 40, a coolant supply pipeline will also be provided to communicate with the coolant inlet of the stack.

[0041] The purge pipeline 30 is used to provide purge gas to the box 41. The purge pipeline 30 includes a backup gas source 33 and a three-way valve 31. The backup gas source 33 can be a pre-filled gas bottle 331, such as a pre-filled nitrogen bottle, a pre-filled air bottle, or a pre-filled air tank, etc., and can also be an air conditioning system 332 of the whole vehicle. One of the openings of the three-way valve 31 is connected to the purge inlet through a pipeline, and the other two openings of the three-way valve 31 are connected to the air supply pipeline 10 and the backup gas source 33 through pipelines. For ease of explanation, the three openings of the three-way valve 31 are respectively the first opening, the second opening and the third opening. The first opening is connected to the purge inlet through a pipeline, the second opening is connected to the air supply pipeline 10, and the third opening is connected to the backup gas source 33. Therefore, the purge pipeline 30 can be switchably connected to the air supply pipeline 10 and the backup gas source 33, so that the air of the air supply pipeline 10 or the air of the backup gas source 33 is sent to the gap between the box 41 and the stack through the purge pipeline 30.

[0042] The exhaust pipe 70 is used to exhaust the purge gas, hydrogen and water vapor. The exhaust pipe 70 is connected to the purge outlet so that the air carried by the purge gas and the water vapor can be discharged outside the stack module 40 .

[0043] The purge system may further include an electrical component, which includes a controller and a hydrogen concentration sensor 44, a humidity sensor 43 and an insulation resistance sensor electrically connected to the controller.

[0044] Specifically: the hydrogen concentration sensor 44 is used to detect the hydrogen concentration in the box 41, so as to judge the hydrogen concentration in the box 41 and determine whether there is a need for purging. When the hydrogen concentration is greater than the first set concentration value, it is considered that the hydrogen concentration in the box 41 is too high, and it is necessary to introduce a purge gas into the box 41 for purging. When the hydrogen concentration is not greater than the first set concentration value, it is considered that the hydrogen concentration in the box 41 is relatively low, and it is not necessary to purge the box 41 temporarily. In specific implementation, the concentration sensor 44 can be installed in the gap between the box 41 and the battery stack. Preferably, due to the low density of hydrogen, the concentration sensor 44 can be installed near the top of the box 41.

[0045] The humidity sensor 43 is used to detect the humidity in the box 41, so as to determine the humidity value in the box 41 and whether there is a need for purging. When the humidity is greater than the first set humidity value, it is considered that the humidity in the box 41 is too high and it is necessary to introduce purge gas into the box 41 for purging. When the humidity is not greater than the first set humidity value, it is considered that the humidity in the box 41 is relatively low and it is not necessary to purge the box 41 for the time being.

[0046] The insulation resistance sensor is used to detect the insulation resistance value of the fuel cell, so as to determine whether the fuel cell has the starting conditions. When the insulation resistance value of the fuel cell is not lower than the set resistance value, it is considered that the fuel cell has the starting conditions, and the stack module 40 can be started. The air supply pipeline 10 supplies air to the stack, and at the same time, purge gas is provided to the box 41 for purge. When the insulation resistance value of the fuel cell is lower than the set resistance value, it is considered that the fuel cell does not have the starting conditions, the stack module 40 cannot be started, and the purge gas cannot be provided to the stack through the air supply pipeline 10. At this time, the backup air source 33 is used to provide purge gas to the box 41.

[0047] The controller is electrically connected to the concentration sensor 44, the humidity sensor 43, the insulation resistance sensor and the three-way valve 31, so that the controller can receive the hydrogen concentration, humidity and insulation resistance value detected by the concentration sensor 44, the humidity sensor 43 and the insulation resistance sensor, so that the three can be compared with the corresponding set concentration value, set humidity value and set resistance value respectively to control the opening of the three-way valve 31. The controller is used to control the opening and closing of the other two ports of the three-way valve 31, so that when the insulation resistance value of the fuel cell is not less than the set resistance value, the purge inlet is connected to the air supply pipeline 10 to purge the box body 41 through air; when the insulation resistance value is less than the set resistance value, the hydrogen concentration in the box body 41 is greater than the first set concentration value, and / or the humidity in the box body 41 is greater than the first set humidity value, the purge inlet is connected to the backup air source 33, so that the air of the backup air source 33 is used as the purge air source until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value.

[0048] In some embodiments, the backup gas source 33 is a pre-filled gas bottle 331 and / or an air conditioning system 332. The pre-filled gas bottle 331 is an additional gas bottle or gas tank installed on the vehicle. In specific implementations, only the pre-filled gas bottle 331 may be provided, or only the air conditioning system 332 may be provided, or both the pre-filled gas bottle 331 and the air conditioning system 332 may be provided. In the case where the backup gas source 33 includes the pre-filled gas bottle 331 and the air conditioning system 332, the pre-filled gas bottle 331 and the air conditioning system 332 may be connected in series or in parallel.

[0049] In some embodiments, the pre-filled gas bottle 331 is provided with a bottle valve to enable the pre-filled gas bottle 331 to supply purge air to the outside or stop supplying purge air. In other embodiments, the pre-filled gas bottle 331 is connected to the valve through a pipeline to enable the pre-filled gas bottle 331 to supply purge air to the outside or stop supplying purge air. In some embodiments, the air-conditioning system 332 is provided with an on-off valve to enable the air-conditioning system 332 to supply purge air to the outside or stop supplying purge air. In other embodiments, the air-conditioning system 332 is connected to the valve through a pipeline to enable the air-conditioning system 332 to supply purge air to the outside or stop supplying purge air.

[0050] When the pre-filled gas bottle 331 is provided with a bottle valve and the air conditioning system 332 is provided with an opening and closing valve, the bottle valve and the opening and closing valve are electrically connected to the controller to realize automatic opening of the bottle valve and the opening and closing valve, with a high degree of automation.

[0051] The controller is used to control the opening and closing of the bottle valve, so that when the hydrogen concentration is greater than the second set concentration value, and / or the humidity is greater than the second set humidity value, and the gas pressure in the pre-filled bottle 331 is greater than the set pressure value, the pre-filled bottle 331 is connected to the purge pipeline 30; and when the hydrogen concentration exceeds the first set concentration value and does not exceed the second set concentration value, and / or the humidity exceeds the first set humidity value and does not exceed the second set humidity value, the power of the power battery is lower than the set power value, and the gas pressure is greater than the set pressure value, the pre-filled bottle 331 is connected to the purge inlet until the hydrogen concentration is no greater than the first set concentration value and the humidity is no greater than the first set humidity value.

[0052] The controller is used to control the opening and closing of the on-off valve, so that when the hydrogen concentration is greater than the first set concentration value, and / or the humidity is greater than the first set humidity value, and the power of the power battery is not less than the set power value, the purge inlet is connected to the air-conditioning system 332, so that the gas of the air-conditioning system 332 purges the box body 41 until the hydrogen concentration is not greater than the first set concentration value, and the humidity is not greater than the first set humidity value.

[0053] When the backup gas source 33 includes both a pre-filled gas bottle 331 and an air-conditioning system 332, the pre-filled gas bottle 331 and the air-conditioning system 332 can simultaneously provide purge air to the box body 41 by opening and closing the bottle valve and the on-off valve, or only one gas source can be used to provide purge gas to adapt to different application scenarios.

[0054] Specifically, when the power of the power battery is lower than the set power value, the bottle valve of the pre-filled bottle 331 can be opened so that the gas in the pre-filled bottle 331 is used as a purge gas source to purge the box 41, thereby realizing a long-range purge strategy. When the power of the power battery is not lower than the set power value, the on-off valve can be opened so that the air-conditioning system 332 is used as a purge gas source to purge the box 41, thereby realizing an economical purge strategy. When the hydrogen concentration in the box 41 is very high, and / or the humidity is very high, and there is an urgent need for purging, the on-off valve and the bottle valve can be opened, and the pre-filled bottle 331 and the air-conditioning system 332 are used together as a purge gas source to purge the box 41, thereby quickly reducing the hydrogen concentration and humidity in the box 41 and improving the safety of the vehicle.

[0055] A pressure sensor for detecting the gas pressure in the pre-filled gas bottle 331 is provided in the pre-filled gas bottle 331, so as to determine the gas pressure in the pre-filled gas bottle 331, thereby determining whether purge air can be provided to the box body 41 and whether there is a need for inflation. The pressure sensor is electrically connected to the controller, and the controller can automatically determine whether purge air can be provided to the box body 41 according to the gas pressure provided by the pressure sensor, and issue a demand alarm when there is a need for inflation.

[0056] When the backup air source 33 includes a pre-filled gas bottle 331 and an air-conditioning system 332 connected in parallel, the purge pipeline 30 also includes a first one-way valve 32 connected in series to the parallel branch corresponding to the air-conditioning system 332, that is, of the other two openings of the three-way valve 31, one is connected to the air supply pipeline 10 through a pipeline, and the other is connected to the pre-filled gas bottle 331 and the first one-way valve 32 through a pipeline, that is to say, the pre-filled gas bottle 331 and the first one-way valve 32 are both connected to the third opening. The setting of the first one-way valve 32 can make the air provided by the air-conditioning system 332 pass through the three-way valve 31 and then be sent into the box body 41, and can also prevent the air in the pre-filled gas bottle 331 from flowing back into the air-conditioning system 332 when the pre-filled gas bottle 331 is used as the supply air source for purge air.

[0057] The air supply pipeline 10 is used as a pipeline for supplying air to the fuel cell stack. It is provided with an air compressor 13. The opening of the three-way valve 31 is connected to the bearing purge outlet of the air compressor 13, that is, the other two openings of the three-way valve 31 are respectively connected to the air bearing purge outlet of the air compressor 13 and the backup air source 33 through pipelines. In other words, the air bearing purge outlet of the air compressor 13 is connected to the second opening of the three-way valve 31, so that the exhaust gas generated by the air compressor 13 is used as the purge gas, which does not affect the normal operation of the air compressor 13. In other embodiments, the air purge outlet of the air compressor 13 can also be connected to the second opening of the three-way valve 31, so that the compressed air generated by the air compressor 13 is used as the purge gas.

[0058] The air supply pipeline 10 also includes an air filter 11, an air flow meter 12, an intercooler 14 and a humidifier 15. The air filter 11, the air flow meter 12, the air compressor 13, the intercooler 14 and the humidifier 15 are arranged in sequence along the air circulation direction to filter, cool and humidify the air to meet the good reaction requirements of the fuel cell stack.

[0059] In some embodiments, the housing 41 is provided with a dehumidification port 414, and the dehumidification port 414 is located at the bottom of the housing 41, so that the water vapor condenses into water and is discharged by gravity. The purge outlet is located at the top of the housing 41, so that the hydrogen with a lower density is discharged from the top to reduce the residue. The discharge pipeline 70 includes a dehumidification pipe 71 and an exhaust pipe 72, and the dehumidification pipe 71 and the exhaust pipe 72 are respectively connected to the dehumidification port 414 and the purge outlet to achieve the external discharge of hydrogen and water. In other embodiments, the dehumidification port 414 and the purge outlet may share a port, and hydrogen and water are both discharged from the common port. In the case where the dehumidification port 414 and the purge outlet adopt a common port, the common port may be set at the bottom of the housing 41, or may be set at the middle or top of the housing 41, and this application is not limited thereto.

[0060] In some embodiments, the exhaust pipeline 70 further includes a second one-way valve 73 and a mixed exhaust pipe 74, and the dehumidification pipe 71 and the exhaust pipe 72 are both connected to the mixed exhaust pipe 74 through the second one-way valve 73. Since the mixed exhaust pipe 74 has a large volume, the pressure is slowly established in the initial stage of purging, and it is easy to inhale the high-humidity hydrogen-containing gas into the box body 41. In addition, in the case of poor exhaust or excessive back pressure, it is also easy to cause the high-humidity hydrogen-containing gas to flow back into the box body 41. The second one-way valve 73 can prevent the hydrogen-containing gas from being inhaled into the box body 41, thereby improving the safety and effectiveness of purging. The one-way valve can be a pressure one-way valve, which can be automatically opened under the pressure of the purge gas to achieve exhaust, and the external gas cannot flow back.

[0061] Based on the same inventive concept, an embodiment of the second aspect of the present application provides a fuel cell box body purging method, which is applicable to a fuel cell box body purging device of any embodiment of the first aspect.

[0062] See also Figure 2 , the purging method provided in this application includes:

[0063] S21, determining whether the insulation resistance value of the fuel cell is not less than a set resistance value;

[0064] S22. When the insulation resistance value is not less than the set resistance value, start the fuel cell, supply air to the stack module 40 through the air supply line 10, control the three-way valve 31 to connect the air supply line 10 with the purge inlet, and supply purge gas to the box through the air supply line 10 until the fuel cell stops working; when the insulation resistance value is less than the set resistance value, obtain the humidity and hydrogen concentration in the box 41 of the stack module 40; when the hydrogen concentration is greater than the first set concentration value, and / or the humidity is greater than the first set humidity value, control the three-way valve 31 to connect the backup air source 33 with the purge inlet, and supply purge gas to the box 41 through the backup air source 33 until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value.

[0065] In step S21, the controller can obtain the insulation resistance value of the battery stack module 40 through the insulation resistance sensor. Generally speaking, the larger the insulation resistance value, the safer it is. The battery stack module 40 will only be started when it is safe. If the insulation resistance value is very small, the battery stack module 40 cannot be started. Generally speaking, the insulation resistance of the battery stack module 40 is related to multiple factors, among which the humidity in the box 41 is also one of the factors affecting the insulation resistance of the battery stack module 40. When the humidity in the box 41 is very high, the insulation resistance of the battery stack module 40 will also be relatively small.

[0066] In step S22, the controller determines whether the fuel cell can be started according to the insulation resistance value obtained. When the insulation resistance value is greater than or equal to the set resistance value, it is considered that the insulation resistance value is large enough, and the stack module 40 can start power supply. The controller controls the first electrically controlled one-way valve to operate, so that the purge pipeline 30 is connected with the air supply pipeline 10. At this time, the air supply pipeline 10 supplies air to the stack on the one hand, and provides purge air to the box 41 through the first electrically controlled one-way valve on the other hand. When the insulation resistance value is less than the set resistance value, it is considered that the insulation resistance value is relatively small. If there is a safety hazard when starting the stack module 40, the stack module 40 cannot be started. At this time, the hydrogen concentration and humidity in the box 41 are obtained. If the hydrogen concentration is very high, that is, greater than the set concentration value, it is considered that a lot of hydrogen is gathered in the box 41, and there is a safety hazard; at the same time, the humidity in the box 41 is also obtained. If the humidity is very high, that is, greater than the set humidity value, it is considered that the insulation resistance in the box 41 is very small, and there is a safety hazard. When one of the above situations occurs, it is necessary to rely on the external backup gas source 33 as a purge gas source to purge the box 41 until the hydrogen concentration in the box 41 drops below the set concentration value and the humidity also drops below the set humidity.

[0067] Based on the same inventive concept, the third aspect of the present application provides a vehicle, comprising a fuel cell box body purging device according to any embodiment of the first aspect.

[0068] The vehicle includes a power battery, which can provide power for the operation of the air conditioner and the vehicle. The pre-filled gas bottle 331 can be fixed to the body of the vehicle.

[0069] Based on the same inventive concept, the fourth aspect of the present application provides a fuel cell box purging method, which is applicable to any embodiment in which the backup gas source 33 includes a pre-filled gas bottle 331 and an air conditioning system 332 connected in parallel.

[0070] The fuel cell box purging method provided in the present application includes:

[0071] S31. Determine whether the insulation resistance value of the fuel cell is not less than a set resistance value.

[0072] S32. When the insulation resistance value is not less than the set resistance value, start the fuel cell, supply air to the fuel cell stack module 40 through the air supply line 10, control the three-way valve 31 to connect the air supply line 10 with the purge inlet, and supply purge gas to the box 41 through the air supply line 10 until the fuel cell stack module stops working; when the insulation resistance value is less than the set resistance value, determine whether the hydrogen concentration in the box 41 is greater than the first set concentration value, and whether the humidity in the box 41 is greater than the first set humidity value.

[0073] S33, please refer to Figure 3 When the hydrogen concentration is greater than the first set concentration value, and / or the humidity is greater than the first set humidity value, it is determined whether the power of the power battery is not less than the set power value. When the power of the power battery is not less than the set power value, the three-way valve 31 and the on-off valve are controlled to operate so that the air-conditioning system 332 is connected to the purge inlet, and the purge gas is provided to the box body 41 through the air-conditioning system 332 until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value; when the power of the power battery is lower than the set power value, it is determined whether the gas pressure of the pre-filled gas bottle 331 is greater than the set pressure value. When the gas pressure is not lower than the set pressure value, the three-way valve 31 and the bottle valve are controlled to operate so that the pre-filled gas bottle 331 is connected to the purge inlet, and the purge gas is provided to the box body 41 through the pre-filled gas bottle 331 until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value.

[0074] Step S31 is the same as step S21 in the embodiment of the second aspect. For more details, please refer to the description of step S21, which will not be repeated here.

[0075] The control strategy in step S32 when the insulation resistance value is not less than the set resistance value is the same as the control strategy in step S22 when the insulation resistance value is not less than the set resistance value. For more information, please refer to the description of the control strategy in step S22, which will not be repeated here.

[0076] In step S32, when the insulation resistance value is less than the set resistance value, the battery stack module 40 cannot be started. At this time, the air conditioning system 332 and the pre-filled gas bottle 331 in the backup gas source 33 need to be used to purge the box 41. Since the vehicle is a fuel-electric hybrid, that is, the battery stack module 40 plus a power battery vehicle, the vehicle's air conditioning system 332 needs to be driven by the power battery, and the power battery is also the power to drive the vehicle. When the power battery has sufficient energy, it can meet the vehicle's driving needs and the air conditioning system 332's need to provide purge air. However, when the power battery is insufficient, it should be considered to first meet the vehicle's driving electricity, reach the nearest maintenance location, and meet the long-range requirements. Therefore, in this scenario, the air in the pre-filled gas bottle 331 is used as the purge air source to purge the box 41. That is to say, when there is a need for purging in the box 41, the air conditioning system 332 is preferentially used as the purge air source, and the pre-filled gas bottle 331 is secondly used as the purge air source, which ensures both economy and long endurance requirements.

[0077] In order to take into account the economic benefits, long battery life requirements and purging efficiency, in some embodiments, when the power is not less than the set power value, the purging method further includes:

[0078] Determine whether the hydrogen concentration is greater than a second set concentration value, whether the humidity is greater than a second set humidity value, and whether the gas pressure is greater than a set pressure value;

[0079] When the gas pressure is greater than the set pressure value, and the hydrogen concentration is greater than the second set concentration value, and / or the humidity is greater than the second set humidity value, the three-way valve 31, the on-off valve and the bottle valve are controlled to operate so that the air conditioning system 332 and the pre-filled bottle 331 are both connected to the purge inlet, and the purge gas is provided to the box 41 through the air conditioning system 332 and the pre-filled bottle 331 until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value. Among them, the second set concentration value is greater than the first set concentration value, and the second set humidity value is greater than the first set humidity value.

[0080] When the hydrogen concentration in the box 41 and / or the humidity in the box 41 is extremely high, that is, when the hydrogen concentration is greater than the second set concentration value, and / or the humidity is greater than the second set humidity value, it is necessary to quickly reduce the hydrogen concentration and humidity in the box 41 to ensure safety. The air-conditioning system 332 and the pre-filled gas bottle 331 are used together as purge air sources to provide purge air to the box 41 through the purge pipeline 30, so that the hydrogen concentration and humidity in the box 41 reach a safe level in the shortest time.

[0081] It can be seen from the above that there are three purge modes for the box 41 when the fuel cell cannot start normally. The first mode: when the purge demand in the box is not so strong, the power battery is relatively sufficient, and the air conditioning system 332 is used to provide purge gas to the box 41. The second mode: when the purge demand in the box is not so strong, the power battery is insufficient, and the pre-filled gas bottle 331 is used to provide purge gas to the box 41. The third mode: when the purge demand in the box 41 is very urgent, and the power battery is also relatively sufficient, the air conditioning system 332 and the pre-filled gas bottle 331 are used together to provide purge gas to the box 41.

[0082] Generally speaking, the air conditioning system 332 is provided with multiple gears, and different gears provide different purge gas flows, and can also be selected from multiple gears according to the power status of the power battery and the purge demand; similarly, the bottle valve of the pre-filled gas bottle 331 can also adjust the opening of the pre-filled gas bottle 331 to adjust the flow of the purge gas supplied by the pre-filled gas bottle 331, so as to select from the opening according to the purge demand, so as to balance the gas consumption and power consumption in the pre-filled gas bottle 331. In specific implementation, the MAP diagram can be determined according to the calibration test to control the air intake gear of the air conditioning system 332 and the opening of the pre-filled gas bottle 331, which will not be elaborated in this application.

[0083] Based on the same inventive concept, the fifth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the purging aspects of any embodiment of the second aspect and the steps of the purging method of any embodiment of the fourth aspect.

[0084] The fuel cell box purge system, purge method, and vehicle provided by the present application have at least the following advantages:

[0085] First, it can be compatible with the normal operation of the fuel cell and the purge of abnormal conditions due to low insulation resistance value due to high humidity. There is no additional power consumption and the efficiency of the fuel cell system will not be reduced.

[0086] Second, in the extreme case where the insulation is lowered in a high humidity environment and the stack module 40 system cannot be started, the pre-filled gas bottle 331 and the vehicle air conditioning system 332 are activated to take air for purging, which can quickly restore the insulation and allow the stack module 40 system to work again.

[0087] Third, in order to balance the economy of gas consumption in the vehicle power battery and the pre-filled gas cylinder 331, the longest cruising range gas extraction strategy and the most economical gas extraction strategy are selected.

[0088] Fourthly, a first one-way valve 32 is provided to prevent the gas in the pre-filled gas bottle 331 from flowing into the air conditioning system 332 and the high-humidity hydrogen-containing gas in the tail exhaust from being sucked back into the box body 41 .

[0089] Fifth, in the initial stage of purging, since the volume of the box 41 is larger than the volume of the tail exhaust pipeline, the pressure is slowly built up, and the high-humidity hydrogen-containing gas in the tail exhaust is easily sucked into the box 41. In addition, when the tail exhaust pipeline is not vented smoothly or the back pressure is too large, it is also easy to cause the high-humidity hydrogen-containing gas in the tail exhaust to flow back into the packaging box 41. The second one-way valve 73 can prevent this from happening, thereby improving the safety and effectiveness of purging.

[0090] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1The steps for the functions specified in one or more boxes.

[0092] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0093] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0094] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0095] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0096] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A fuel cell box purge system, characterized in that: include: A battery stack module, comprising a box and a battery stack located in the box, wherein the box is provided with a purge inlet and a purge outlet; An air supply pipeline connected to the air inlet of the fuel cell stack; a discharge pipeline connected to the purge outlet; The purge pipeline includes a backup air source and a three-way valve, one opening of the three-way valve is connected to the purge inlet through a pipeline, and the other two openings of the three-way valve are connected to the air supply pipeline and the backup air source through pipelines respectively.

2. The fuel cell box purge system according to claim 1, characterized in that: The backup gas source is a pre-filled gas bottle and / or an air conditioning system. The pre-filled gas bottle is provided with a bottle valve, and the air conditioning system is provided with an opening and closing valve.

3. The fuel cell box purge system according to claim 2, characterized in that: The backup gas source includes the pre-filled gas bottle and the air conditioning system connected in parallel; the purge pipeline also includes a first one-way valve connected in series to the parallel branch corresponding to the air conditioning system.

4. The fuel cell box purge system according to any one of claims 1 to 3, characterized in that: The opening of the three-way valve is connected to the air bearing purge outlet of the air compressor of the air supply pipeline.

5. The fuel cell box purge system according to any one of claims 1 to 3, characterized in that: The box body is provided with a moisture discharge port, the moisture discharge port is located at the bottom of the box body, and the purge outlet is located at the upper part of the box body; The discharge pipeline includes a dehumidification pipe, an exhaust pipe, a mixed exhaust pipe and a second one-way valve. One end of the dehumidification pipe and the exhaust pipe are respectively connected to the dehumidification port and the purge outlet, and the other end is connected to the mixed exhaust pipe through the second one-way valve.

6. A fuel cell box purging method, implemented based on the fuel cell box purging system according to any one of claims 1 to 5, characterized in that: The purging method comprises: Determine whether the insulation resistance value of the fuel cell is not less than the set resistance value; When the insulation resistance value is not less than the set resistance value, the fuel cell is started, air is supplied to the stack module through the air supply pipeline, the three-way valve is controlled to conduct the air supply pipeline with the purge inlet, and purge gas is supplied to the box through the air supply pipeline until the fuel cell stops working; When the insulation resistance value is less than the set resistance value, determine whether the hydrogen concentration in the box is greater than the first set concentration value, and whether the humidity in the box is greater than the first set humidity value. When the hydrogen concentration is greater than the first set concentration value, and / or the humidity is greater than the first set humidity value, control the three-way valve to connect the backup gas source to the purge inlet, and provide purge gas to the box through the backup gas source until the hydrogen concentration is not greater than the first set concentration value, and the humidity is not greater than the first set humidity value.

7. A vehicle, characterized in that: A fuel cell box body purge device comprising any one of claims 1-6.

8. A fuel cell box purging method, implemented based on the vehicle according to claim 7, characterized in that: The vehicle is provided with a power battery, and the backup gas source of the fuel cell box purge device includes the pre-filled gas bottle and the air conditioning system connected in parallel; The purging method comprises: Determine whether the insulation resistance value of the fuel cell is not less than the set resistance value; When the insulation resistance value is not less than the set resistance value, the fuel cell is started, air is supplied to the stack module through the air supply pipeline, and the three-way valve is controlled to operate so that the air supply pipeline is connected to the purge inlet, and purge gas is supplied to the box through the air supply pipeline until the stack module stops working; When the insulation resistance value is less than the set resistance value, it is determined whether the hydrogen concentration in the box is greater than the first set concentration value and whether the humidity in the box is greater than the first set humidity value; when the hydrogen concentration is greater than the first set concentration value and / or the humidity is greater than the first set humidity value, it is determined whether the power of the power battery is not less than the set power value. When the power is not less than the set power value, the three-way valve and the on-off valve are controlled to operate so that the air-conditioning system is connected to the purge inlet, and the purge gas is provided to the box through the air-conditioning system until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value; when the power is lower than the set power value, it is determined whether the gas pressure of the pre-filled gas bottle is greater than the set pressure value. When the gas pressure is greater than the set pressure value, the three-way valve and the bottle valve are controlled to operate so that the pre-filled gas bottle is connected to the purge inlet, and the purge gas is provided to the box through the pre-filled gas bottle until the hydrogen concentration is not greater than the first set concentration value and the humidity is not greater than the first set humidity value.

9. The fuel cell box purging method according to claim 8, characterized in that: When the power is not less than the set power value, the purging method further includes: Determine whether the hydrogen concentration is greater than a second set concentration value, whether the humidity is greater than a second set humidity value, and whether the gas pressure is greater than a set pressure value; When the gas pressure is greater than the set pressure value, and when the hydrogen concentration is greater than the second set concentration value, and / or the humidity is greater than the second set humidity value, the three-way valve, the on-off valve and the bottle valve are controlled to operate so that the air-conditioning system and the pre-filled gas bottle are connected to the purge inlet, and purge gas is provided to the box through the air-conditioning system and the pre-filled gas bottle until the hydrogen concentration is no greater than the first set concentration value, and the humidity is no greater than the first set humidity value.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the purging method according to claim 8 or 9 are implemented.

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