Fuel cell system, control method thereof, controller, storage medium, and vehicle

Abstract

The invention discloses a fuel cell system, a control method of the fuel cell system, a controller, a computer storage medium and a vehicle. The fuel cell system comprises an electric pile and a power cell, the power end of the cooling water pump is connected with the galvanic pile and the power battery, a cooling liquid outlet of the cooling water pump is connected with a cooling liquid inlet of the galvanic pile, a cooling liquid inlet of the cooling water pump is connected with a cooling liquid outlet of the galvanic pile, and the cooling water pump is powered by the power battery to drive cooling liquid to flow under the condition that the insulation state of the galvanic pile is a fault; the first end of the deionizer is connected with the cooling liquid inlet of the electric pile and the cooling liquid outlet of the cooling water pump, and the second end of the deionizer is connected with the cooling liquid inlet of the cooling water pump and the cooling liquid outlet of the electric pile and used for adsorbing ions in the cooling liquid. By adopting the system, the cooling water pump can still be started under the condition that the galvanic pile insulation detection cannot be passed, so that the effect of reducing the ion concentration of the cooling liquid by utilizing the deionizer is achieved under the driving of the cooling water pump.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a fuel cell system, a control method for the fuel cell system, a controller, a computer storage medium and a vehicle. Background Art

[0002] In the related art, when a vehicle is left unused for a long period of time, a large number of ions are released from various components in the stack cooling circuit of the fuel cell system, causing the stack insulation test to fail and the stack to be unable to be powered on normally. The stack cannot supply power to the cooling water pump in the cooling circuit, and the cooling water pump cannot drive the coolant to circulate into the deionizer installed in the cooling circuit, thereby making the deionizer unable to work to remove ions from the coolant, thereby affecting the normal operation of the vehicle. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a fuel cell system, which can still start the cooling water pump when the stack insulation test fails, so as to achieve the effect of reducing the ion concentration of the coolant by using a deionizer under the drive of the cooling water pump.

[0004] A second objective of the present invention is to provide a control method for a fuel cell system.

[0005] A third objective of the present invention is to provide a controller.

[0006] A fourth objective of the present invention is to provide a computer storage medium.

[0007] A fifth object of the present invention is to provide a vehicle.

[0008] In order to solve the above problems, a first aspect of the present invention proposes a fuel cell system, which includes: a fuel cell stack and a power battery; a cooling water pump, wherein the power supply end of the cooling water pump is connected to the fuel cell stack and the power battery, the coolant outlet of the cooling water pump is connected to the coolant inlet of the fuel cell stack, and the coolant inlet of the cooling water pump is connected to the coolant outlet of the fuel cell stack, and the cooling water pump is used to drive the coolant to flow when the insulation state of the fuel cell stack is faulty and is powered by the power battery; a deionizer, wherein the first end of the deionizer is connected to the coolant inlet of the fuel cell stack and the coolant outlet of the cooling water pump, and the second end of the deionizer is connected to the coolant inlet of the cooling water pump and the coolant outlet of the fuel cell stack, and is used to adsorb ions in the coolant.

[0009] According to the fuel cell system of an embodiment of the present invention, based on the cooling circulation loop formed among the cooling water pump, the fuel cell stack and the deionizer, the power supply end of the cooling water pump is connected to both the fuel cell stack and the power battery, so that the cooling water pump can be started under the power supply of both the fuel cell stack and the power battery. Therefore, even in the case that the cooling water pump cannot be started due to insulation failure of the fuel cell stack, the power battery can still be used to power the cooling water pump, so that the cooling water pump drives the coolant to flow in the cooling circulation loop, so that the coolant output from the cooling loop of the fuel cell stack enters the deionizer, and the deionizer removes ions in the coolant, thereby achieving the effect of reducing the ion concentration of the coolant, maintaining the insulation performance of the system, and promoting the normal operation of the vehicle.

[0010] In some embodiments, the fuel cell system also includes: a DCDC module, the output end of the DCDC module is connected to the power supply end of the high-voltage bus circuit of the vehicle where the power battery is located, and the DCDC module is used to use the electric energy of the battery stack to power the load; a relay unit, the first end of the relay unit is connected to the battery stack, and the second end of the relay unit is connected to the input end of the DCDC module, and the relay unit is used to control the power on and off between the battery stack and the high-voltage bus circuit.

[0011] In some embodiments, the relay unit includes: a main positive relay, a first end of the main positive relay is connected to the positive pole of the battery stack, and a second end of the main positive relay is connected to the positive input terminal of the DCDC module; a main negative relay, a first end of the main negative relay is connected to the negative pole of the battery stack, and a second end of the main negative relay is connected to the negative input terminal of the DCDC module; wherein the positive output terminal of the DCDC module is connected to the positive power supply terminal of the high-voltage bus loop, and the negative output terminal of the DCDC module is connected to the negative power supply terminal of the high-voltage bus loop.

[0012] A second aspect of the present invention provides a control method for a fuel cell system, which is used for the fuel cell system of the above embodiment, and the method includes: obtaining the insulation state of the battery stack; when it is determined that the insulation state is a fault, controlling the cooling water pump to start under the power supply of the power battery to drive the coolant output by the cooling circuit of the battery stack to flow in the deionizer.

[0013] According to the control method of the fuel cell system of an embodiment of the present invention, based on setting the power supply end of the cooling water pump to be connected to both the fuel cell stack and the power battery, when the insulation state of the fuel cell stack is faulty, the cooling water pump can drive the coolant to flow in the cooling circuit under the power supply of the power battery, and drive the coolant output from the cooling circuit of the fuel cell stack to enter the deionizer, so that the deionizer adsorbs ions in the coolant, reduces the conductivity of the coolant, and improves the insulation resistance of the fuel cell stack, thereby avoiding the problem of the fuel cell stack failing to start normally due to insulation failure of the fuel cell stack.

[0014] In some embodiments, the method further includes: when the insulation state is normal, controlling the relay unit to close and starting the fuel cell stack.

[0015] In some embodiments, the method further includes: controlling the cooling water pump to stop running when the startup time of the cooling water pump reaches a preset time and the insulation state is still faulty; and controlling the vehicle to switch from the hybrid mode to the pure electric mode.

[0016] In some embodiments, the method further includes: when the fuel cell stack meets the stop operation condition, controlling the relay unit of the fuel cell system to disconnect, wherein the stop operation condition at least includes the vehicle being powered at high voltage and the vehicle being in pure electric mode.

[0017] The third aspect of the present invention proposes a controller, comprising at least one processor; a memory communicatively connected to at least one of the processors; wherein the memory stores a computer program executable by at least one of the processors, and when at least one of the processors executes the computer program, the control method of the fuel cell system of the above embodiment is implemented.

[0018] According to the controller of the embodiment of the present invention, the control method of the fuel cell system of the above embodiment is executed by the processor, which can avoid the insulation resistance of the high-voltage bus circuit being affected by the insulation resistance of the battery stack, so that the insulation test can be passed when the vehicle is restarted, ensuring the normal high voltage of the high-voltage bus circuit and the normal operation of the vehicle.

[0019] A fourth aspect of the present invention provides a computer storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the control method of the fuel cell system of the above-mentioned embodiment.

[0020] A fifth aspect of the present invention provides a vehicle, comprising the fuel cell system of the above embodiment; and a controller of the above embodiment, wherein the controller is connected to the fuel cell system.

[0021] According to the vehicle of the embodiment of the present invention, through the fuel cell system of the above embodiment, it is possible to avoid the insulation resistance of the high-voltage bus circuit being affected by the insulation resistance of the fuel cell stack, so that the insulation test can be passed when the vehicle is restarted, ensuring the normal high voltage of the high-voltage bus circuit and the normal operation of the vehicle.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic diagram of a vehicle structure according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of a cooling cycle according to an embodiment of the present invention;

[0026] Figure 3 is a flow chart of a control method of a fuel cell system according to an embodiment of the present invention;

[0027] Figure 4 is a flow chart of a method for controlling a fuel cell system according to another embodiment of the present invention;

[0028] Figure 5 is a structural block diagram of a controller according to an embodiment of the present invention;

[0029] Figure 6 is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] Vehicles 2000;

[0032] Fuel cell system 1000;

[0033] High voltage bus circuit 100;

[0034] Battery stack 10; DCDC module 20; relay unit 30; power battery 40; cooling circulation loop 50; insulation detection module 60; controller 70;

[0035] Main positive relay 1; main negative relay 2; cooling water pump 3; deionizer 4; processor 5; memory 6; radiator 7; air compressor 8; bridge 9; air conditioning compressor 11; power battery insulation detection module 12. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0037] During the operation of the existing fuel cell system, the coolant of the stack will carry away the heat generated by the electrochemical reaction process through the bipolar plates of the stack. The bipolar plates are responsible for collecting the electrons generated by the stack, and then collecting the voltage generated by the single cell through the current collector. At this time, there will be voltage on the bipolar plates, which plays the role of connecting the single cells in series. The voltage of the stack is high voltage, and the insulation performance between the charged parts inside the stack and the external shell must be controlled to ensure high-voltage safety performance. The high ion concentration inside the stack coolant will lead to an increase in conductivity, which will be transmitted to the entire cooling system through the coolant, resulting in a decrease in the insulation performance of the stack, and the various electrical components in the cooling system will continue to precipitate ions into the coolant, which will cause the coolant ion concentration to increase and the conductivity to increase.

[0038] However, the cooling water pump of the fuel cell system generally uses a high-pressure water pump. The water pump can only operate after the vehicle insulation test passes and high voltage electricity is supplied. If the vehicle is left unused for a long time, many ions will be precipitated from various components in the stack cooling circuit of the fuel cell system, making it impossible to pass the insulation test of the vehicle and unable to supply high voltage electricity. The stack will also be unable to power the cooling water pump in the cooling circuit, and the cooling water pump will be unable to drive the coolant to circulate into the deionizer installed in the cooling circuit, which will make the deionizer unable to work to remove ions in the coolant, thus affecting the normal operation of the vehicle.

[0039] In order to solve the above problems, the first embodiment of the present invention proposes a fuel cell system. With this system, the cooling water pump can still be started when the fuel cell stack insulation test fails, thereby achieving the effect of reducing the coolant ion concentration by using a deionizer under the drive of the cooling water pump.

[0040] Reference below Figure 1 and Figure 2 The fuel cell system 1000 according to an embodiment of the present invention is described. The fuel cell system 1000 includes a fuel cell stack 10 , a power battery 40 , a cooling water pump 3 , and a deionizer 4 .

[0041] in, Figure 1 It is a diagram of the electrical connection architecture between the battery stack 10, the power battery 40, and the cooling water pump 3. Figure 2 Schematic diagram of the cooling cycle formed between the stack 10, the cooling water pump 3 and the deionizer 4. For details, refer to Figure 1As shown, in terms of electrical connection, the power supply end of the cooling water pump 3 is connected to both the battery stack 10 and the power battery 40, that is, the power supply end of the cooling water pump 3 is connected to both the battery stack 10 and the power battery 40 at the same time, so that the power supply of the cooling water pump 3 is no longer only provided by the battery stack 10, and the cooling water pump 3 can be started under the power supply of the battery stack 10, and can also be started under the power supply of the power battery 40; refer to Figure 2 As shown, in terms of cooling cycle, the coolant outlet of the cooling water pump 3 is connected to the coolant inlet of the fuel cell stack 10, and the coolant inlet of the cooling water pump 3 is connected to the coolant outlet of the fuel cell stack 10; the first end of the deionizer 4 is connected to the coolant inlet of the fuel cell stack 10 and the coolant outlet of the cooling water pump 3, and the second end of the deionizer 4 is connected to the coolant inlet of the cooling water pump 3 and the coolant outlet of the fuel cell stack 10, for adsorbing ions in the coolant.

[0042] Based on the above-mentioned architectural design, when the cooling water pump 3 cannot be started due to a battery stack insulation failure caused by long-term storage of the vehicle, that is, when the insulation state of the battery stack 10 is faulty, the power battery 40 supplies power to start the cooling water pump 3, so that the cooling water pump 3 drives the coolant to flow in the cooling circulation loop 50, and the coolant output from the cooling loop where the battery stack 10 is located enters the deionizer 4, and the deionizer 4 adsorbs ions in the coolant, thereby achieving the effect of reducing the ion concentration of the coolant, maintaining the insulation performance of the system, and promoting the normal operation of the vehicle.

[0043] According to the fuel cell system 1000 of an embodiment of the present invention, based on the cooling circulation loop 50 formed between the cooling water pump 3, the fuel cell stack 10 and the deionizer 4, the power supply end of the cooling water pump 3 is connected to both the fuel cell stack 10 and the power battery 40, so that the cooling water pump 3 can be started under the power supply of the fuel cell stack 10 or the power supply of the power battery 40. Therefore, even if the cooling water pump cannot be started due to a fuel cell stack insulation failure caused by long-term storage of the vehicle, the power battery 40 can still be used to power the cooling water pump 3, so that the cooling water pump 3 drives the coolant to flow in the cooling circulation loop, so that the coolant output from the cooling loop where the fuel cell stack 10 is located enters the deionizer 4, and the deionizer 4 removes ions in the coolant, thereby achieving the effect of reducing the ion concentration of the coolant, maintaining the insulation performance of the system, and promoting the normal operation of the vehicle.

[0044] In some embodiments, the fuel cell system 1000 further includes a DCDC module 20 and a relay unit 30 .

[0045] Among them, reference Figure 1As shown, the output end of the DCDC module 20 is connected to the power end of the high-voltage bus circuit 100 of the vehicle where the power battery 40 is located and the power end of the cooling water pump 3. The DCDC module 20 is used to use the electric energy of the battery stack 10 to power the load. The DCDC module 20 is used to convert the electric energy provided by the battery stack into electric energy suitable for use by the load. The high-voltage bus circuit 100 is used to deliver electric energy to the high-voltage components of the vehicle; wherein, when the cooling water pump 3 is used to be powered by the power battery 40 and / or the battery stack 10 when the insulation state is normal, the coolant is driven to flow in the cooling circulation loop 50. Among them, when the battery stack 10 supplies power to the cooling water pump 3, the voltage output by the battery stack 3 will be converted by the DCDC module 20 and then provided to the cooling water pump 3.

[0046] In addition, the first end of the relay unit 30 is connected to the battery stack 10, and the second end of the relay unit 30 is connected to the input end of the DCDC module 20, that is, the relay unit 30 is set at the connection between the battery stack 10 and the high-voltage bus circuit 100, and the relay unit 30 is used to control the power on and off between the battery stack 10 and the high-voltage bus circuit 100.

[0047] The stack 10 is the functional core of the fuel cell system 1000, and includes components such as a proton exchange membrane, a catalyst, a gas diffusion layer, a bipolar plate, a current collecting plate, a sealing assembly, and an end plate. The stack 10 is the place where the electrochemical reaction occurs. Since the output power of a single fuel cell unit is relatively small, multiple fuel cell units are usually stacked in series to form a stack to increase the overall output power.

[0048] Specifically, before the fuel cell vehicle is connected to high voltage, the insulation performance of each high voltage component needs to be tested. Only when the insulation meets certain requirements, the whole vehicle is allowed to be connected to high voltage. However, when the ion concentration inside the stack coolant is high, the conductivity will increase and be transmitted to the entire cooling system through the coolant, resulting in a decrease in the insulation performance of the whole vehicle. In this regard, in the present application, based on the arrangement of a relay unit 30 between the stack 10 and the DCDC module 20, that is, the relay unit 30 is arranged at the connection between the stack 10 and the high voltage bus circuit 100, so that when the stack 10 is not involved in the work, the relay unit 30 is controlled to be disconnected, so that the power between the stack 10 and the high voltage bus circuit 100 is disconnected, thereby isolating the insulation resistance value on the stack 10 side from the insulation resistance value on the high voltage bus circuit 100 side, so that the insulation resistance value on the high voltage bus circuit 100 side is not affected by the insulation resistance value on the stack 10 side, thereby enabling the vehicle to pass the insulation test after power-on, and ensuring that the high voltage bus circuit 100 can normally connect to high voltage under the power supply of the power battery 40.

[0049] According to the fuel cell system 1000 of an embodiment of the present invention, a relay unit 30 is set between the battery stack and the DCDC module. When the vehicle is powered on at high voltage, the relay unit 30 is controlled to be disconnected to isolate the battery stack 10 from the high-voltage bus circuit 100, thereby preventing the insulation resistance of the high-voltage bus circuit from being affected by the insulation resistance of the battery stack after the vehicle is powered on again, so that the insulation test can be passed when the vehicle is restarted, ensuring that the high-voltage bus circuit 100 can normally be powered on at high voltage, thereby ensuring the normal operation of the vehicle.

[0050] In some embodiments, reference Figure 1 As shown, the relay unit 30 includes: a main positive relay 1 and a main negative relay 2 .

[0051] Among them, the first end of the main positive relay 1 is connected to the positive pole of the battery stack 10, and the second end of the main positive relay 1 is connected to the positive input terminal of the DCDC module 20; the first end of the main negative relay 2 is connected to the negative pole of the battery stack 10, and the second end of the main negative relay 2 is connected to the negative input terminal of the DCDC module 20; wherein, the positive output terminal of the DCDC module 20 is connected to the positive power supply terminal of the high-voltage bus loop 100, and the negative output terminal of the DCDC module 20 is connected to the negative power supply terminal of the high-voltage bus loop 100.

[0052] Specifically, when the fuel cell vehicle is powered off at high voltage, the main positive relay 1 and the main negative relay 2 of the control relay unit 30 are disconnected to cut off the connection between the positive and negative poles of the fuel cell stack 10 and the positive and negative poles of the DCDC module 20, that is, the power of the control fuel cell stack 10 and the high-voltage bus loop 100 is disconnected to isolate the fuel cell stack 10 from the high-voltage bus loop 100, so as to isolate the insulation resistance of the fuel cell stack 10 from the insulation resistance of the high-voltage bus loop 100, so that the insulation resistance of the high-voltage bus loop is not affected by the insulation resistance of the fuel cell stack, so that the insulation test can be passed when the vehicle is restarted, ensuring that the high-voltage bus loop 100 can be normally supplied with high voltage.

[0053] In some embodiments, reference Figure 1 As shown, the fuel cell system 1000 further includes an insulation detection module 60 . The insulation detection module 60 is used to detect the insulation state of the fuel cell stack 10 .

[0054] Specifically, in existing vehicles, power battery insulation detection modules are only provided at both ends of the power battery 40 to perform insulation detection on the vehicle. However, it is difficult to determine the insulation state of the battery stack 10. In order to solve this problem, in the present application, insulation detection modules 60 are provided at both ends of the battery stack 10 to detect the insulation state of the battery stack 10, that is, the insulation state of the battery stack 10 is determined by detecting the insulation resistance of the battery stack 10, so that insulation failure of the battery stack 10 can be detected in time to ensure the insulation performance of the battery stack 10.

[0055] In an embodiment, Figure 2 As shown, a radiator 7 is also provided in the cooling circulation loop 50, and the radiator 7 is used to dissipate the heat of the coolant in the cooling loop.

[0056] In an embodiment, Figure 1 As shown, the vehicle 2000 includes high-voltage electrical components such as an air compressor 8, an electric bridge 9 and an air-conditioning compressor 11, wherein the air compressor 8 is used to provide air for the battery stack 10, and the high-voltage bus circuit 100 is connected to the cooling water pump 3, the air compressor 8, the electric bridge 9, the air-conditioning compressor 11, the power battery insulation detection module, and the power battery 20 on the right side of the DCDC module 20.

[0057] A second aspect of the present invention provides a control method for a fuel cell system, which is used in the fuel cell system of the above embodiment. Figure 3 As shown, the control method of the fuel cell system includes:

[0058] Step S1, obtaining the insulation status of the battery stack.

[0059] Specifically, the insulation state of the battery stack is obtained through the insulation detection module, wherein the insulation state of the battery stack may be the insulation performance between the charged parts inside the battery stack and the external shell.

[0060] Step S2, when it is determined that the insulation state is a fault, the cooling water pump is controlled to start under the power supply of the power battery to drive the coolant output from the cooling circuit of the fuel cell stack to flow in the deionizer.

[0061] Specifically, in the related art, after a vehicle has been left unused for a long time, many ions are released from various components of the cooling circuit in the fuel cell system. However, the deionizer in the cooling circuit cannot work to remove the ions, resulting in an increase in the local conductivity of the coolant. However, at this time, the fuel cell stack cannot supply power to the cooling water pump to drive the coolant to remove ions, which causes an insulation failure in the fuel cell stack and the vehicle cannot be started normally. In order to solve this problem, the power supply end of the cooling water pump is connected to both the fuel cell stack and the power battery in the present application, so that the cooling water pump can be started under the power supply of the fuel cell stack or the power battery, thereby The cooling water pump can work under the power supply of the power battery to drive the coolant to flow in the cooling circuit, and drive the coolant output from the cooling circuit of the battery stack to enter the deionizer to remove ions, thereby avoiding the problem that the battery stack cannot be started normally due to insulation failure of the battery stack. That is to say, if the insulation state of the battery stack is determined to be a fault, the cooling water pump can still be started under the power supply of the power battery, driving the coolant to flow in the cooling circuit, so that the deionizer absorbs ions in the coolant, reduces the conductivity of the coolant, and increases the insulation resistance of the battery stack, thereby avoiding insulation failure of the battery stack, so that the battery stack can be started normally.

[0062] Exemplarily, during the high-voltage power-on stage of the vehicle, if the driver selects the vehicle's operating mode as hybrid mode, the battery stack insulation detection module detects that the insulation state of the battery stack is faulty, and then controls the cooling water pump to start under the power supply of the power battery to drive the coolant to flow in the cooling circuit, so that the deionizer absorbs ions in the coolant, thereby avoiding insulation failure of the battery stack and allowing the battery stack to start normally.

[0063] According to the control method of the fuel cell system of an embodiment of the present invention, based on setting the power supply end of the cooling water pump 3 to be connected to both the fuel cell stack 10 and the power battery 40, when the insulation state of the fuel cell stack 10 is faulty, the cooling water pump 3 can drive the coolant to flow in the cooling circuit under the power supply of the power battery 40, and drive the coolant output from the cooling circuit where the fuel cell stack 10 is located to enter the deionizer 4, so that the deionizer 4 adsorbs ions in the coolant, reduces the conductivity of the coolant, and improves the insulation resistance of the fuel cell stack 10, thereby avoiding the problem that the fuel cell stack 10 cannot start normally due to insulation failure of the fuel cell stack 10.

[0064] In some embodiments, when the insulation state is normal, the relay unit is controlled to close and the fuel cell stack is started.

[0065] Specifically, during the high-voltage power-on stage of the vehicle, the power battery 40 supplies power to the load. If the driver selects the hybrid mode as the vehicle's operating mode, in the hybrid mode, the battery stack 10 and the power battery 40 jointly supply power to the load. In order to ensure the high-voltage safety performance of the battery stack 10, the insulation state of the battery stack 10 is detected by the insulation detection module 60. If it is determined that the insulation state of the battery stack 10 is normal, the control relay unit 30 is closed to control the power connection between the battery stack 10 and the high-voltage bus circuit 100, and the battery stack 10 is started. As a result, the vehicle achieves hybrid mode operation.

[0066] In some embodiments, when the startup time of the cooling water pump reaches a preset time and the insulation state is still faulty, the cooling water pump is controlled to stop running; and the vehicle is controlled to switch from hybrid mode to pure electric mode.

[0067] Specifically, in the prior art, when the cooling water pump 3 runs for a long time, the cooling water pump 3 cannot increase the insulation resistance of the battery stack 10 due to other faults of the battery stack 10, so that the insulation resistance of the battery stack 10 cannot meet the insulation resistance threshold set by the insulation detection, and the battery stack 10 cannot start normally. At this time, the vehicle cannot be on high voltage. In order to solve this problem, a preset time is set in the present application as the stop time of the cooling water pump 3, wherein the preset time can be 1 minute, thereby ensuring that the vehicle can be on high voltage normally. That is to say, after the start time of the cooling water pump 3 reaches the preset time under the power supply of the power battery 40, if the insulation state of the battery stack 10 is still faulty, that is, the insulation resistance of the battery stack 10 cannot meet the insulation resistance threshold set by the insulation detection, the cooling water pump 3 is controlled to stop running, and the vehicle is automatically controlled to switch from hybrid mode to pure electric mode, thereby avoiding the problem of long-term operation of the cooling water pump 3 when the insulation resistance is low due to other faults of the battery stack 10, ensuring that the vehicle can be on high voltage normally.

[0068] In some embodiments, when the fuel cell stack meets the stop operation condition, the relay unit controlling the fuel cell system is disconnected, wherein the stop operation condition at least includes that the vehicle is powered off at high voltage and the vehicle is in pure electric mode.

[0069] Specifically, when the fuel cell stack 10 meets the stopping condition, that is, when the fuel cell stack 10 does not participate in the power supply demand of the vehicle, such as when the vehicle is powered on at high voltage or the vehicle is in pure electric mode, the relay unit 30 that controls the fuel cell system 1000 is disconnected, that is, the power of the fuel cell stack 10 and the high-voltage bus circuit 100 is disconnected to isolate the fuel cell stack 10 from the high-voltage bus circuit 100. At this time, the fuel cell stack 10 is not working and cannot provide power to the DCDC module 20, and the DCDC module 20 cannot transmit the power of the fuel cell stack 10 to the high-voltage bus circuit 100. The insulation performance of the battery stack 10 will decrease after being left unused for a long period of time. When the user restarts the vehicle, since the power between the battery stack 10 and the high-voltage bus loop 100 is still disconnected, the current output by the battery stack 10 cannot flow to the high-voltage bus loop 100. Therefore, regardless of whether the battery stack 10 is insulated or not, the insulation performance of the battery stack 10 will not affect the insulation performance of the high-voltage bus loop 100, that is, the insulation resistance of the high-voltage bus loop is not affected by the insulation resistance of the battery stack, so that the vehicle can pass the insulation test after power-on, thereby ensuring that the high-voltage bus loop 100 can normally supply high voltage.

[0070] In an embodiment, when the vehicle is in pure electric mode, the relay unit of the fuel cell system is controlled to be disconnected to control the stack to stop working, thereby preventing the insulation resistance of the stack from affecting the insulation resistance of the high-voltage bus circuit.

[0071] Reference below Figure 4 The control method of the fuel cell system according to the embodiment of the present invention is described as an example, and the specific steps are as follows.

[0072] Step S3, start.

[0073] Step S4, the vehicle is powered on at low voltage.

[0074] Step S5, determining whether the insulation state of the power battery is normal, if so, executing step S6, if not, executing step S17.

[0075] Step S6, controlling the first relay and the second relay to close, and executing step S15.

[0076] Among them, the first relay and the second relay are arranged between the power battery insulation detection module and the air-conditioning compressor.

[0077] Step S7: The user selects the hybrid mode.

[0078] Step S8, determine whether the insulation status of the battery stack is normal, if so, execute step S9, if not, execute step S12.

[0079] Step S9, controlling the main positive relay and the main negative relay to close.

[0080] Step S10, the battery stack is started.

[0081] Step S11, the vehicle runs in hybrid mode, and then executes step S16.

[0082] Step S12, controlling the cooling water pump to start.

[0083] Step S13, determining whether the startup time of the cooling water pump reaches a preset time, if so, executing step S14, if not, executing step S8.

[0084] Step S14, controlling the cooling water pump to stop running.

[0085] Step S15, the vehicle operates in pure electric mode.

[0086] Step S16, the vehicle is powered off at high voltage.

[0087] Step S17, end.

[0088] The third aspect of the present invention provides a controller 70, referring to Figure 5 As shown, the controller 70 includes at least one processor 5 and a memory 6 communicatively connected to the at least one processor 5 .

[0089] The memory 6 stores a computer program that can be executed by at least one processor 5 , and when the at least one processor 5 executes the computer program, the control method of the fuel cell system of the above embodiment is implemented.

[0090] According to the controller 70 of the embodiment of the present invention, the control method of the fuel cell system of the above embodiment is executed by the processor, which can avoid the insulation resistance of the high-voltage bus circuit being affected by the insulation resistance of the fuel cell stack, so that when the vehicle is restarted, the insulation test can be passed to ensure that the high-voltage bus circuit 100 is normally high-voltage and the vehicle operates normally.

[0091] A fourth aspect of the present invention provides a computer storage medium having a computer program stored thereon, wherein the computer program is executed to implement the control method of the fuel cell system of the above embodiment.

[0092] A fifth embodiment of the present invention provides a vehicle 2000, referring to Figure 6 As shown, a fuel cell system 1000 and a controller 70 are included.

[0093] The controller 70 is connected to the fuel cell system 1000 .

[0094] According to the vehicle 2000 of the embodiment of the present invention, through the fuel cell system 1000 of the above embodiment, it is possible to prevent the insulation resistance of the high-voltage bus circuit from being affected by the insulation resistance of the fuel cell stack, so that when the vehicle 2000 is restarted, the insulation test can be passed, ensuring that the high-voltage bus circuit 100 is normally high-voltage and the vehicle 2000 operates normally.

[0095] In the description of this specification, any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code including one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0096] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or otherwise processing in a suitable manner if necessary, and then stored in a computer memory.

[0097] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0098] A person skilled in the art may understand that all or part of the steps in the above-mentioned embodiment method may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0099] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0100] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0101] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0102] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fuel cell system, characterized in that: include: Battery stack and power battery; A cooling water pump, wherein a power supply end of the cooling water pump is connected to both the battery stack and the power battery, a coolant outlet of the cooling water pump is connected to a coolant inlet of the battery stack, and a coolant inlet of the cooling water pump is connected to a coolant outlet of the battery stack, and the cooling water pump is used to be powered by the power battery to drive the coolant to flow when the insulation state of the battery stack is faulty; A deionizer, wherein the first end of the deionizer is connected to the coolant inlet of the battery stack and the coolant outlet of the cooling water pump, and the second end of the deionizer is connected to the coolant inlet of the cooling water pump and the coolant outlet of the battery stack, and is used to adsorb ions in the coolant.

2. The fuel cell system according to claim 1, characterized in that: Also includes: A DCDC module, wherein the output end of the DCDC module is connected to the power supply end of the high-voltage bus circuit of the vehicle where the power battery is located and the power supply end of the cooling water pump, and the DCDC module is used to use the electric energy of the battery stack to power the load; A relay unit, wherein a first end of the relay unit is connected to the battery stack, a second end of the relay unit is connected to an input end of the DCDC module, and the relay unit is used to control the power on and off between the battery stack and the high-voltage bus circuit.

3. The fuel cell system according to claim 2, characterized in that: The relay unit comprises: A main positive relay, wherein a first end of the main positive relay is connected to the positive electrode of the battery stack, and a second end of the main positive relay is connected to the positive input terminal of the DCDC module; A main negative relay, wherein a first end of the main negative relay is connected to the negative electrode of the battery stack, and a second end of the main negative relay is connected to the negative electrode input terminal of the DCDC module; Wherein, the positive output terminal of the DCDC module is connected to the positive power supply terminal of the high-voltage bus loop, and the negative output terminal of the DCDC module is connected to the negative power supply terminal of the high-voltage bus loop.

4. A control method for a fuel cell system, characterized in that: For the fuel cell system according to any one of claims 1 to 3, the method comprises: Get the insulation status of the battery stack; When it is determined that the insulation state is a fault, the cooling water pump is controlled to start under the power supply of the power battery to drive the coolant output by the cooling circuit of the battery stack to flow in the deionizer.

5. The control method of the fuel cell system according to claim 4, characterized in that: The method further comprises: When the insulation state is normal, the relay unit is controlled to close and the fuel cell stack is started.

6. The control method of the fuel cell system according to claim 4, characterized in that: The method further comprises: When the startup time of the cooling water pump reaches a preset time and the insulation state is still faulty, controlling the cooling water pump to stop running; Control the vehicle to switch from a hybrid mode to a pure electric mode.

7. The control method of the fuel cell system according to any one of claims 4 to 6, characterized in that: The method further comprises: When the fuel cell stack meets the stop operation condition, the relay unit controlling the fuel cell system is disconnected, wherein the stop operation condition at least includes that the vehicle is powered on at high voltage and the vehicle is in pure electric mode.

8. A controller, characterized in that: include: at least one processor; a memory communicatively coupled to at least one of the processors; Wherein, the memory stores a computer program that can be executed by at least one of the processors, and when at least one of the processors executes the computer program, the control method of the fuel cell system according to any one of claims 4 to 7 is implemented.

9. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the control method of the fuel cell system according to any one of claims 4 to 7 is implemented.

10. A vehicle, characterized in that: include: The fuel cell system according to any one of claims 1 to 3; The controller of claim 8, wherein the controller is connected to the fuel cell system.

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