Hydrogen fuel cell coolant system and method of cooling

Abstract

The present application relates to hydrogen fuel cell technology field, specifically relates to a kind of hydrogen fuel cell coolant cooling system and cooling method, the outlet of the electric pile, first three-way valve, radiator and the inlet of the electric pile form the first loop of coolant;The outlet of the electric pile, first three-way valve, deionizer, second three-way valve and the inlet of the electric pile form the second loop of coolant;The deionizer is also connected radiator by second three-way valve;The sensor assembly includes temperature ion sensor, the temperature ion sensor is used to monitor the temperature and ion concentration of the coolant of electric pile output or input electric pile;The controller is respectively communicated and connected first three-way valve, second three-way valve and sensor assembly.The hydrogen fuel cell coolant cooling system provided by the present application can adjust how much deionizer and radiator handle coolant according to the working condition of electric pile, to further more effectively meet the working condition requirement of electric pile.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen fuel cell, in particular to a hydrogen fuel cell cooling liquid cooling system and a cooling method. BACKGROUND

[0002] The stack of the hydrogen fuel cell needs to use cooling liquid for cooling in the working process, the cooling liquid circulates in the cooling system, and the circulating loop of the cooling system passes through the stack, so that the cooling liquid takes away the heat of the fuel cell when passing through the stack.

[0003] Referring to the hydrogen fuel cell cooling system disclosed in the Chinese patent application No. CN201921948586.9, it includes a deionizer, a radiator and the like; the hydrogen fuel cell cooling system not only needs to use the radiator to cool the cooling liquid, but also needs to use the deionizer to remove the ions brought by the stack to the cooling liquid.

[0004] However, the hydrogen fuel cell cooling system in the prior art, such as the technical solution described in the above patent application, has the following problems: the deionizer and the radiator are always in series or always in parallel, so that the flow of the cooling liquid passing through the deionizer or the radiator is not easy to adjust according to the working condition of the stack.

[0005] For example, in the case of low load of the stack, if the deionizer and the radiator are in parallel, the deionizer is arranged on the cooling liquid bypass between the stack cooling liquid inlet and outlet, when the temperature of the stack rises to the rated temperature after the fuel cell generates electricity, the cooling liquid flow in the bypass of the small cycle needs to be reduced or completely closed to ensure the heat dissipation performance of the cooling system. If the ion concentration in the system is too high at this time and the ion concentration needs to be reduced, part of the high-temperature cooling liquid needs to flow to the bypass where the deionizer is located, so the cooling liquid flowing through the main road for heat dissipation will be reduced, which will cause the temperature fluctuation of the cooling liquid entering the stack, affecting the stable operation of the stack. If the heat dissipation performance is to be ensured, the cooling liquid needs to pass through the radiator on the main road to reduce the temperature as much as possible and then flow back to the stack, resulting in less cooling liquid flowing to the bypass where the deionizer is located, which may not be able to reduce the ion concentration in the cooling liquid in time.

[0006] For example, in the case of high load of the stack, if the deionizer and the radiator are in series, the processing efficiency of the deionizer for the cooling liquid is slow, and the flow of the cooling liquid passing through the deionizer is small, which causes the cooling liquid to be unable to cool the stack in time.

[0007] For example, the temperature of the stack is low under some working conditions, if the cooling liquid always passes through the radiator (the radiator of the cooling system always reduces the temperature of the cooling liquid), which causes the temperature of the stack to be too low, which is also not conducive to the work of the stack. SUMMARY

[0008] The technical problem solved by the present application is to provide a hydrogen fuel cell coolant cooling system and a cooling method, so that the deionizer and the radiator can adjust the size of the coolant flow according to the working condition of the stack.

[0009] In order to solve the above technical problems, the technical scheme adopted by the present application is: a hydrogen fuel cell coolant cooling system, comprising a stack, a first three-way valve, a radiator, a deionizer, a second three-way valve, a sensor assembly and a controller.

[0010] The outlet of the stack, the first three-way valve, the radiator and the inlet of the stack form a first loop of the coolant;

[0011] The outlet of the stack, the first three-way valve, the deionizer, the second three-way valve and the inlet of the stack form a second loop of the coolant;

[0012] The deionizer is also connected to the radiator through the second three-way valve;

[0013] The sensor assembly comprises a temperature ion sensor for monitoring the temperature and ion concentration of the coolant output from the stack or input into the stack;

[0014] The controller is respectively connected to the first three-way valve, the second three-way valve and the sensor assembly.

[0015] Further, it further comprises a first three-way pipe and a second three-way pipe, the second three-way valve and the radiator are connected to the inlet of the stack through the first three-way pipe, the first three-way pipe is connected to the inlet of the stack through the second three-way pipe, the second three-way pipe is used to make the external additional coolant flow into the inlet of the stack, the sensor assembly further comprises a temperature sensor, and the temperature sensor is arranged on the pipeline between the first three-way pipe and the second three-way pipe.

[0016] Further, it further comprises a coolant tank and a third three-way pipe, the sensor assembly further comprises a flow sensor, and the outlet of the stack, the coolant tank, the third three-way pipe and the inlet of the stack form a third loop of the coolant;

[0017] The first three-way pipe is connected to the inlet of the stack through the third three-way pipe, a flow sensor is arranged between the first three-way pipe and the third three-way pipe, and the coolant tank is connected to the controller.

[0018] Further, the coolant tank comprises a tank body, the tank body has a plurality of inlet and outlet interfaces, a first valve is arranged in the inlet and outlet interface, and the first valve is connected to the controller;

[0019] The third three-way pipe and the outlet of the stack are connected to the inlet and outlet interface of the tank body through a pipeline.

[0020] Further, the heat sink is also connected with the inlet and outlet interfaces of the cooling liquid tank through pipelines;

[0021] The second valve is arranged between the heat sink and the first three-way pipe, and is in communication connection with the controller.

[0022] Further, the third three-way pipe and the inlet of the electric pile are arranged with a water pump.

[0023] Further, the protection pipeline is arranged between the first three-way valve and the second three-way valve, and is connected with the deionizer in parallel.

[0024] Further, the cooling liquid tank is arranged, and the outlet of the electric pile, the cooling liquid tank and the inlet of the electric pile form a third loop of the cooling liquid; and the cooling liquid tank is an expansion water tank.

[0025] Further, one end of the second three-way valve connected with the heat sink is arranged with a one-way valve.

[0026] Further, one end of the second three-way valve connected with the inlet of the electric pile is arranged with a one-way valve.

[0027] Another technical solution of the application is a cooling method of hydrogen fuel cell cooling liquid, wherein a cooling system is used to cool the cooling liquid, and the cooling method comprises the following steps:

[0028] S1: all ports of the first three-way valve and the second three-way valve are completely opened, a first preset value and a second preset value of the cooling liquid temperature are defined, and the first preset value is less than the second preset value;

[0029] A third preset value of the ion concentration of the cooling liquid is defined;

[0030] S2: the temperature ion sensor is used to monitor the temperature and ion concentration of the cooling liquid output from or input into the electric pile, and the temperature ion sensor sends the obtained signals to the controller;

[0031] S3: the controller is set to control the first three-way valve and the second three-way valve according to the obtained information as follows:

[0032] when the temperature of the cooling liquid is greater than the second preset value, the port of the first three-way valve flowing to the deionizer is reduced or closed, and the port of the second three-way valve flowing to the inlet of the electric pile is reduced or closed;

[0033] when the temperature of the cooling liquid is greater than the first preset value and less than the second preset value, and the ion concentration is less than the third preset value, the port of the first three-way valve flowing to the heat sink is closed, and the port of the second three-way valve flowing to the inlet of the electric pile is closed;

[0034] When the temperature of the cooling liquid is less than the first preset value, the port of the first three-way valve flowing to the radiator is closed, and the port of the second three-way valve flowing to the radiator is closed.

[0035] When the ion concentration of the cooling liquid is greater than the third preset value, the port of the first three-way valve flowing to the radiator is reduced or closed, and the port of the second three-way valve flowing to the radiator is reduced or closed.

[0036] The hydrogen fuel cell cooling liquid cooling system provided by the application has the beneficial effects that the temperature ion sensor can sense the working condition of the stack, and then the controller controls the opening and closing of each input and output end of the first three-way valve and the second three-way valve, so as to realize the change of the deionizer and the radiator in series and parallel connection, and realize the free combination of full load or no load of the deionizer and the radiator.

[0037] Therefore, the hydrogen fuel cell cooling liquid cooling system provided by the application can adjust the amount of cooling liquid processed by the deionizer and the radiator according to the working condition of the stack, so as to more effectively meet the working condition requirements of the stack. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a partial structure schematic view of the hydrogen fuel cell cooling liquid cooling system of the embodiment of the application.

[0039] Figure 2 It is a whole structure schematic view of the hydrogen fuel cell cooling liquid cooling system of the embodiment of the application.

[0040] Figure 3 It is a partial structure schematic view of the hydrogen fuel cell cooling liquid cooling system of the embodiment of the application.

[0041] Label explanation: 1, stack; 2, first three-way valve; 3, radiator; 4, deionizer; 41, protection pipeline; 5, second three-way valve; 6, sensor assembly; 7, controller; 8, cooling liquid tank; 9, water pump; 10, check valve. DETAILED DESCRIPTION

[0042] In order to explain the technical content, the purposes and effects of the application in detail, the following will be described in combination with the embodiments and the accompanying drawings.

[0043] Please refer to Figure 1 A hydrogen fuel cell cooling liquid cooling system, comprising a stack 1, a first three-way valve 2, a radiator 3, a deionizer 4, a second three-way valve 5, a sensor assembly 6 and a controller 7.

[0044] The outlet of the stack 1, the first three-way valve 2, the radiator 3 and the inlet of the stack 1 form a first cooling liquid circuit.

[0045] The outlet of the stack 1, the first three-way valve 2, the deionizer 4, the second three-way valve 5 and the inlet of the stack 1 form a second loop of the cooling liquid;

[0046] The deionizer 4 is also connected to the radiator 3 through the second three-way valve 5;

[0047] The sensor assembly 6 comprises a temperature and ion sensor for monitoring the temperature and ion concentration of the cooling liquid output from or input into the stack 1;

[0048] The controller 7 is communicatively connected to the first three-way valve 2, the second three-way valve 5 and the sensor assembly 6 respectively.

[0049] As can be seen from the above description, the hydrogen fuel cell cooling system provided by the application can adjust the amount of cooling liquid processed by the deionizer 4 and the radiator 3 according to the working condition of the stack 1, thereby more effectively meeting the working condition requirements of the stack.

[0050] Therefore, the hydrogen fuel cell cooling system provided by the application can adjust the amount of cooling liquid processed by the deionizer 4 and the radiator 3 according to the working condition of the stack 1, thereby more effectively meeting the working condition requirements of the stack.

[0051] Further, the first three-way pipe and the second three-way pipe are also included, the second three-way valve 5 and the radiator 3 are connected to the inlet of the stack 1 through the first three-way pipe, the first three-way pipe is connected to the inlet of the stack through the second three-way pipe, the second three-way pipe is used to make the external additional (usually in the expansion tank) cooling liquid flow into the inlet of the stack, and the sensor assembly 6 further comprises a temperature sensor arranged on the pipeline between the first three-way pipe and the second three-way pipe.

[0052] As can be seen from the above description, because the temperature and ion sensor can be arranged at the outlet of the stack 1 or at the inlet of the stack 1, and the second three-way pipe can (possibly) be connected to the external additional (usually in the expansion tank) cooling liquid, and another temperature sensor is arranged to monitor the temperature of the cooling liquid at the mixing point of the cooling liquid output from the deionizer 4 and the cooling liquid of the radiator 3, the controller 7 can more accurately grasp the change of the temperature of the cooling liquid.

[0053] Please refer to Figure 2 Further, the cooling liquid tank 8 and the third three-way pipe are also included, and the sensor assembly 6 further comprises a flow sensor, and the outlet of the stack 1, the cooling liquid tank 8, the third three-way pipe and the inlet of the stack 1 form a third loop of the cooling liquid.

[0054] The first three-way pipe is connected with the inlet of the electric pile 1 through a third three-way pipe, and a flow sensor is arranged between the first three-way pipe and the third three-way pipe, and the cooling liquid tank 8 is in communication connection with the controller 7.

[0055] As can be seen from the above description, the controller 7 can know the flow of the cooling liquid that should flow into the inlet of the electric pile 1 under normal circumstances through the flow sensor, and if the flow changes, the controller 7 controls the opening of the input end or the output end of the cooling liquid tank 8, so that the cooling liquid tank 8 can adjust the flow of the circulating cooling liquid.

[0056] Further, the cooling liquid tank 8 comprises a tank body, the tank body has a plurality of inlet and outlet interfaces, and a first valve is arranged in the inlet and outlet interface, and the first valve is in communication connection with the controller 7.

[0057] The third three-way pipe and the outlet of the electric pile 1 are both connected with the inlet and outlet interfaces of the tank body through pipelines.

[0058] As can be seen from the above description, the above-mentioned setting provides a structure that the cooling liquid tank 8 can control the opening and closing of the inlet and outlet interfaces through the controller 7.

[0059] Further, the radiator 3 is also connected with the inlet and outlet interfaces of the cooling liquid tank 8 through a pipeline;

[0060] A second valve is arranged between the radiator 3 and the first three-way pipe, and the second valve is in communication connection with the controller 7.

[0061] As can be seen from the above description, when the temperature of the cooling liquid output by the electric pile 1 is too high and the radiator 3 is fully loaded and still cannot handle it, the controller 7 closes the second valve and the end of the cooling liquid tank 8 connected with the outlet of the electric pile 1, and the output end of the cooling liquid tank 8 and the connection end of the radiator 3 are opened (which can be realized by the opening and closing of the first valve), so that the cooling liquid which is still high temperature after being processed by the radiator 3 is mixed with the normal temperature cooling liquid in the cooling liquid tank 8, and the normal temperature cooling liquid is replaced to be input into the inlet of the electric pile 1, so that the inlet of the electric pile 1 can receive the cooling liquid with the lowest temperature.

[0062] Further, a water pump 9 is arranged between the third three-way pipe and the inlet of the electric pile 1.

[0063] As can be seen from the above description, the water pump 9 assists to provide power for the circulation of the cooling liquid.

[0064] Further, a protection pipeline 41 is further arranged, the protection pipeline 41 is connected with the first three-way valve 2 and the second three-way valve 5, and the protection pipeline 41 is connected with the deionizer 4 in parallel.

[0065] As can be seen from the above description, the protection pipeline 41 avoids that the cooling liquid flowing to the deionizer 4 has too high pressure (too large flow) and damages the deionizer 4.

[0066] Please refer to Figure 3 Further (parallel to the above-described solution of the cooling liquid tank 8), it further comprises a cooling liquid tank 8, the outlet of the stack 1, the cooling liquid tank 8 and the inlet of the stack 1 form a third cooling liquid loop; the cooling liquid tank 8 is an expansion tank.

[0067] From the above description, it can be seen that the expansion tank can automatically adjust the flow and pressure of the circulating cooling liquid.

[0068] Further, one end of the second three-way valve 5 connected to the radiator 3 is provided with a one-way valve 10.

[0069] From the above description, it can be seen that the one-way valve 10 avoids the backflow of the cooling liquid.

[0070] Further, one end of the second three-way valve 5 connected to the inlet of the stack 1 is provided with a one-way valve 10.

[0071] From the above description, it can be seen that the one-way valve 10 avoids the backflow of the cooling liquid.

[0072] The application scenario of the hydrogen fuel cell cooling liquid cooling system provided in the following embodiments is: when the cooling system of the hydrogen fuel cell needs to adjust the processing capacity of the radiator 3 and the deionizer 4 according to the working condition of the stack 1.

[0073] Embodiment one

[0074] Please refer to Figure 3 A hydrogen fuel cell cooling liquid cooling system, comprising a stack 1, a first three-way valve 2, a radiator 3, a deionizer 4, a second three-way valve 5, a sensor assembly 6 and a controller 7.

[0075] The outlet of the stack 1, the first three-way valve 2, the radiator 3 and the inlet of the stack 1 form a first cooling liquid loop;

[0076] The outlet of the stack 1, the first three-way valve 2, the deionizer 4, the second three-way valve 5 and the inlet of the stack 1 form a second cooling liquid loop;

[0077] The deionizer 4 is further connected to the radiator 3 through the second three-way valve 5;

[0078] The sensor assembly 6 comprises a temperature ion sensor, which is used to monitor the temperature and ion concentration of the cooling liquid output from or input into the stack 1; the temperature ion sensor is composed of a temperature sensor and an electrical conductivity sensor.

[0079] The controller 7 is respectively communicatively connected to the first three-way valve 2, the second three-way valve 5 and the sensor assembly 6.

[0080] The first three-way pipe and the second three-way pipe are connected to the inlet of the stack 1 through the first three-way pipe, and the inlet of the stack is connected to the second three-way pipe, and the second three-way pipe is used to merge the external additional cooling liquid into the inlet of the stack.

[0081] The third three-way pipe and the inlet of the stack 1 are provided with a water pump 9.

[0082] The protection pipeline 41 is connected to the first three-way valve 2 and the second three-way valve 5, and the protection pipeline 41 is connected in parallel with the deionizer 4.

[0083] The cooling liquid tank 8 is further included, and the outlet of the stack 1, the cooling liquid tank 8 and the inlet of the stack 1 form a third cooling liquid loop; and the cooling liquid tank 8 is an expansion tank.

[0084] The use and principle of the cooling system of the hydrogen fuel cell cooling liquid provided by the embodiment are as follows:

[0085] The temperature ion sensor can be arranged between the outlet of the stack 1 and the first three-way valve 2.

[0086] When the temperature ion sensor monitors that the cooling liquid temperature of the stack 1 output or input into the stack 1 is too high, the controller 7 obtains the information, controls the ports of the first three-way valve 2 and the second three-way valve 5, closes or reduces the port of the first three-way valve 2 to the deionizer, closes the port of the second three-way valve 5 to the stack, and opens the port of the second three-way valve to the radiator, so that the deionizer 4 is connected in series in front of the radiator 3, and more cooling liquid can flow through the radiator for heat dissipation.

[0087] When the temperature ion sensor monitors that the cooling liquid temperature of the stack 1 output or input into the stack 1 is slightly high, and the ion concentration is high, the controller 7 obtains the information, controls the connection between the first three-way valve 2 and the deionizer 4 to be opened, adjusts the opening degree, controls the connection between the second three-way valve 5 and the radiator 3 to be disconnected, so that the deionizer 4 and the radiator 3 are connected in parallel, and the radiator 3 normally performs the cooling work, part of the cooling liquid flows through the auxiliary path and can be treated by the deionizer, so that the ion concentration of the cooling liquid can be reduced.

[0088] When the temperature ion sensor monitors that the cooling liquid temperature of the stack 1 output or input into the stack 1 is not high, and the ion concentration needs to be reduced, the controller 7 obtains the information, controls all the ports of the first three-way valve 2 and the second three-way valve 5 to the radiator 3 to be closed, so that the radiator 3 is unloaded, and the cooling liquid is only treated by the deionizer 4, so that the cooling liquid can be quickly heated to the working temperature.

[0089] The expansion water tank can automatically compensate system pressure.

[0090] Therefore, the hydrogen fuel cell cooling system can adjust the amount of cooling liquid processed by the deionizer 4 and the radiator 3 according to the working condition of the stack 1, thereby more effectively meeting the working condition requirements of the stack.

[0091] Embodiment two

[0092] Please refer to Figure 2 A hydrogen fuel cell cooling system, comprising a stack 1, a first three-way valve 2, a radiator 3, a deionizer 4, a second three-way valve 5, a sensor assembly 6 and a controller 7.

[0093] The outlet of the stack 1, the first three-way valve 2, the radiator 3 and the inlet of the stack 1 form a first cooling liquid circuit;

[0094] The outlet of the stack 1, the first three-way valve 2, the deionizer 4, the second three-way valve 5 and the inlet of the stack 1 form a second cooling liquid circuit;

[0095] The deionizer 4 is also connected to the radiator 3 through the second three-way valve 5.

[0096] The sensor assembly 6 comprises a temperature ion sensor for monitoring the temperature and ion concentration of the cooling liquid output from or input to the stack 1; the temperature ion sensor is composed of a temperature sensor and an electrical conductivity sensor.

[0097] The controller 7 is communicatively connected to the first three-way valve 2, the second three-way valve 5 and the sensor assembly 6, respectively.

[0098] It also includes a first three-way pipe and a second three-way pipe, the second three-way valve 5 and the radiator 3 are connected to the inlet of the stack 1 through the first three-way pipe, the first three-way pipe is connected to the inlet of the stack through the second three-way pipe, the second three-way pipe is used to make the external additional cooling liquid flow into the inlet of the stack, the sensor assembly 6 further comprises a temperature sensor, which is arranged on the pipeline between the first three-way pipe and the second three-way pipe. Specifically, the temperature sensor is arranged between the first three-way pipe and the second three-way pipe.

[0099] It also includes a cooling liquid tank 8 and a third three-way pipe, the sensor assembly 6 further comprises a flow sensor, the outlet of the stack 1, the cooling liquid tank 8, the third three-way pipe and the inlet of the stack 1 form a third cooling liquid circuit;

[0100] The first three-way pipe is connected to the inlet of the stack 1 through the third three-way pipe, a flow sensor is arranged between the first three-way pipe and the third three-way pipe, and the cooling liquid tank 8 is communicatively connected to the controller 7.

[0101] The cooling liquid tank 8 comprises a tank body with multiple inlet and outlet interfaces, in which first valves are arranged, which are in communication with the controller 7.

[0102] The third three-way pipe and the outlet of the electric pile 1 are both connected to the inlet and outlet interfaces of the tank body through pipes.

[0103] The radiator 3 is also connected to the inlet and outlet interfaces of the cooling liquid tank 8 through pipes.

[0104] The second valves are arranged between the radiator 3 and the first three-way pipe, which are in communication with the controller 7.

[0105] The water pump 9 is arranged between the third three-way pipe and the inlet of the electric pile 1.

[0106] The protection pipe 41 is arranged between the first three-way valve 2 and the second three-way valve 5, which is in parallel with the deionizer 4.

[0107] The one-way valve 10 is arranged at one end of the second three-way valve 5 connected to the radiator 3.

[0108] The one-way valve 10 is arranged at one end of the second three-way valve 5 connected to the inlet of the electric pile 1.

[0109] The sensor is arranged between the first three-way valve 2 and the deionizer 4.

[0110] The use, principle or supplement of the hydrogen fuel cell cooling liquid cooling system provided in the embodiment are as follows:

[0111] In the hydrogen fuel cell cooling liquid cooling system provided in the embodiment, sensors can also be arranged at the following positions, such as between the two one-way valves 10 and the second three-way valve 5, and between the radiator 3 and the first three-way pipe. The positions of the radiator 3 and the deionizer 4 can be replaced with each other.

[0112] In the hydrogen fuel cell cooling liquid cooling system provided in the embodiment, the positions where certain sensors are arranged can be provided with another kind of sensor according to the situation, such as, at the position where the temperature sensor is arranged, a flow sensor, an electric conductivity sensor or a pressure sensor can also be arranged.

[0113] The temperature ion sensor can sense the working condition of the electric pile 1, and then control the opening and closing of each input and output end of the first three-way valve 2 and the second three-way valve 5 through the controller 7, so as to realize the change of the series and parallel connection of the deionizer 4 and the radiator 3, and realize the free combination of the full load or empty load of the radiator 3 and the full load or empty load of the deionizer 4.

[0114] Therefore, the hydrogen fuel cell cooling system can adjust the amount of cooling liquid processed by the deionizer 4 and the radiator 3 according to the working condition of the stack 1, and further more effectively meet the working condition requirements of the stack.

[0115] When the temperature of the cooling liquid output by the stack 1 is too high and the radiator 3 is fully loaded and still insufficient to process, the controller 7 closes the end of the second valve and the cooling liquid tank 8 connected to the outlet of the stack 1, and opens the output end of the cooling liquid tank 8 and the connection end of the radiator 3 (which can be realized by opening and closing the first valve), so that the cooling liquid with high temperature processed by the radiator 3 is mixed with the cooling liquid with normal temperature in the cooling liquid tank 8, and the cooling liquid with normal temperature is replaced and input into the inlet of the stack 1, so that the inlet of the stack 1 can receive the cooling liquid with the lowest temperature.

[0116] The plurality of sensors (sensor assembly 6) arranged in the cooling system can monitor the ion concentration and flow of the cooling liquid before (or after) the deionizer 4, the temperature and flow of the cooling liquid before (or after) the radiator 3, the ion concentration and flow and temperature of the cooling liquid output by the deionizer 4 before (or after) mixing with the cooling liquid output by the radiator 3, and the ion concentration and flow and temperature of the cooling liquid input into the stack 1 (possibly mixed with the cooling liquid output by the cooling liquid tank 8) and the cooling liquid output by the stack 1.

[0117] Embodiment three

[0118] Please refer to Figure 2 The embodiment provides a hydrogen fuel cell cooling method for cooling and reducing the ion concentration of the cooling liquid by using the hydrogen fuel cell cooling system provided in the embodiment one, and the cooling method comprises the following steps.

[0119] S1: fully open all ports of the first three-way valve and the second three-way valve, define a first preset value and a second preset value of the cooling liquid temperature, and the first preset value is less than the second preset value;

[0120] S2: monitor the temperature and ion concentration of the cooling liquid output by the stack or input into the stack by using the temperature ion sensor, and send the obtained signal to the controller by the temperature ion sensor;

[0121] S2: monitor the temperature and ion concentration of the cooling liquid output by the stack or input into the stack by using the temperature ion sensor, and send the obtained signal to the controller by the temperature ion sensor;

[0122] S3: the controller controls the first three-way valve and the second three-way valve according to the obtained information as follows:

[0123] When the temperature of the cooling liquid is greater than the second preset value, reduce or close the port of the first three-way valve flowing to the deionizer; reduce or close the port of the second three-way valve flowing to the inlet of the stack;

[0124] When the temperature of the cooling liquid is greater than the first preset value and less than the second preset value, and the ion concentration is less than the third preset value, the port of the first three-way valve flowing to the radiator is closed, and the port of the second three-way valve flowing to the inlet of the stack is closed.

[0125] When the temperature of the cooling liquid is less than the first preset value, the port of the first three-way valve flowing to the radiator is closed, and the port of the second three-way valve flowing to the radiator is closed.

[0126] When the ion concentration of the cooling liquid is greater than the third preset value, the port of the first three-way valve flowing to the radiator is reduced or closed, and the port of the second three-way valve flowing to the radiator is reduced or closed.

[0127] The hydrogen fuel cell cooling liquid cooling system provided by the present application has the beneficial effects that the temperature ion sensor can sense the working condition of the stack, and then the controller controls the opening and closing of each input and output end of the first three-way valve and the second three-way valve, so as to realize the change of the deionizer and the radiator in series and parallel connection, and realize the free combination of the full load or no load of the radiator and the full load or no load of the deionizer.

[0128] Therefore, the hydrogen fuel cell cooling liquid cooling system provided by the present application can adjust the amount of cooling liquid processed by the deionizer and the radiator according to the working condition of the stack, so as to more effectively meet the working condition requirements of the stack.

[0129] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent transformation or direct or indirect application in the related technical field based on the content of the specification and drawings of the present application is also included in the patent protection scope of the present application.

Claims

1. A cooling system for a hydrogen fuel cell coolant, characterized by, The cooling system comprises a stack, a first three-way valve, a radiator, a deionizer, a second three-way valve, a sensor assembly and a controller. The outlet of the stack, the first three-way valve, the radiator and the inlet of the stack form a first loop of the cooling liquid; the outlet of the stack, the first three-way valve, the deionizer, the second three-way valve and the inlet of the stack form a second loop of the cooling liquid. The deionizer is further connected to the radiator through the second three-way valve. The sensor assembly comprises a temperature ion sensor for monitoring the temperature and ion concentration of the cooling liquid output by the stack or input into the stack. The controller is respectively connected to the first three-way valve, the second three-way valve and the sensor assembly. The cooling system further comprises a first three-way pipe and a second three-way pipe, the second three-way valve and the radiator are both connected to the inlet of the stack through the first three-way pipe, the first three-way pipe is connected to the inlet of the stack through the second three-way pipe, the second three-way pipe is used for merging external additional cooling liquid into the inlet of the stack, the sensor assembly further comprises a temperature sensor arranged on the pipeline between the first three-way pipe and the second three-way pipe. The cooling system further comprises a protection pipeline connected to the first three-way valve and the second three-way valve; the protection pipeline is connected in parallel to the deionizer.

2. The cooling system for a hydrogen fuel cell coolant according to claim 1, wherein The cooling system further comprises a cooling liquid tank and a third three-way pipe, the sensor assembly further comprises a flow sensor, the outlet of the stack, the cooling liquid tank, the third three-way pipe and the inlet of the stack form a third loop of the cooling liquid. The first three-way pipe is connected to the inlet of the stack through the third three-way pipe, a flow sensor is arranged between the first three-way pipe and the third three-way pipe, and the cooling liquid tank is connected to the controller.

3. The cooling system for a hydrogen fuel cell coolant according to claim 2, wherein The cooling liquid tank comprises a tank body, the tank body has a plurality of inlet and outlet interfaces, a first valve is arranged in the inlet and outlet interface, and the first valve is connected to the controller. The third three-way pipe and the outlet of the stack are both connected to the inlet and outlet interface of the tank body through a pipeline.

4. The cooling system for a hydrogen fuel cell coolant according to claim 2, wherein The radiator is further connected to the inlet and outlet interface of the cooling liquid tank through a pipeline. A second valve is arranged between the radiator and the first three-way pipe, and the second valve is connected to the controller.

5. The cooling system for a hydrogen fuel cell coolant according to claim 2, wherein A water pump is arranged between the third three-way pipe and the inlet of the stack.

6. The cooling system for a hydrogen fuel cell coolant according to claim 1, wherein The cooling system further comprises a cooling liquid tank, the outlet of the stack, the cooling liquid tank and the inlet of the stack form a third loop of the cooling liquid, and the cooling liquid tank is an expansion tank.

7. The cooling system for a hydrogen fuel cell coolant according to claim 1, wherein One end of the second three-way valve connected to the radiator is provided with a one-way valve; one end of the second three-way valve connected to the inlet of the stack is provided with a one-way valve.

8. A method of cooling a hydrogen fuel cell coolant fluid, characterized by, The cooling method comprises the following steps: S1: completely open all ports of the first three-way valve and the second three-way valve, set a first preset value and a second preset value of the cooling liquid temperature, and the first preset value is less than the second preset value; set a third preset value of the ion concentration of the cooling liquid; S2: use the temperature ion sensor to monitor the temperature and ion concentration of the cooling liquid output by the stack or input into the stack, and make the temperature ion sensor send the obtained signal to the controller; S3: the controller controls the first three-way valve and the second three-way valve according to the obtained information as follows: When the temperature of the cooling liquid is greater than the second preset value, the port of the first three-way valve flowing to the deionizer is reduced or closed; the port of the second three-way valve flowing to the inlet of the stack is reduced or closed; When the temperature of the cooling liquid is greater than the first preset value and less than the second preset value, and the ion concentration is less than the third preset value, the port of the first three-way valve flowing to the radiator is closed, and the port of the second three-way valve flowing to the inlet of the stack is closed; When the temperature of the cooling liquid is less than the first preset value, the port of the first three-way valve flowing to the radiator is closed, and the port of the second three-way valve flowing to the radiator is closed; When the ion concentration of the cooling liquid is greater than the third preset value, the port of the first three-way valve flowing to the radiator is reduced or closed, and the port of the second three-way valve flowing to the radiator is reduced or closed.

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