Fuel cell system and cooling loop device for fuel cell system

Abstract

The utility model provides a fuel cell system and a cooling loop device used for the fuel cell system, the cooling loop device comprises a hydrogen heat exchanger, a temperature sensor and a coolant regulator, the hydrogen heat exchanger and the coolant regulator form a cooling loop, and the coolant regulator is electrically connected with the temperature sensor; the temperature sensor is used for measuring the temperature of hydrogen entering the electric pile; the coolant regulator is used for regulating the coolant flow flowing through the hydrogen heat exchanger according to the hydrogen temperature, so that the hydrogen temperature output by the hydrogen heat exchanger is within the target temperature range. According to the utility model, the temperature of hydrogen finally passing through the hydrogen heat exchanger is in a proper temperature range through the regulating effect of the coolant regulator, so that the occurrence of excessive heat exchange or insufficient heat exchange is avoided, the temperature control precision is higher, and the system is more suitable for the requirements of a fuel cell system.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technology field, specifically, relate to a kind of fuel cell system and cooling circuit device for fuel cell system. BACKGROUND

[0002] Fuel cell system hydrogen circuit generally has hydrogen circulation loop, under the condition that ambient temperature is lower, the wet hydrogen of circulation loop and the hydrogen mixed from hydrogen cylinder decompression comes over can produce condensation and there is liquid water directly into stack to affect the problem of stack life.

[0003] Many of the existing fuel cell systems have added hydrogen heat exchanger, and the hot coolant is introduced through the stack coolant circuit to exchange heat with hydrogen. However, the existing cooling circuit does not have a coolant flow regulating device, so it is not possible to accurately control the hydrogen temperature within a more suitable range, which adversely affects the system. SUMMARY

[0004] The utility model embodiment provides at least a kind of fuel cell system and cooling circuit device for fuel cell system, by the accurate regulation and control of hydrogen temperature on cooling circuit, provide better fuel cell system solution.

[0005] In a first aspect, the utility model embodiment provides a cooling circuit device for a fuel cell system, comprising: a hydrogen heat exchanger, a temperature sensor and a coolant regulator, the hydrogen heat exchanger and the coolant regulator form a cooling circuit, and the coolant regulator is electrically connected with the temperature sensor.

[0006] The temperature sensor is used to measure the temperature of hydrogen entering the stack.

[0007] The coolant regulator is used to adjust the flow of coolant through the hydrogen heat exchanger according to the hydrogen temperature, so that the hydrogen temperature output by the hydrogen heat exchanger is within the target temperature range.

[0008] In one possible implementation, the hydrogen heat exchanger includes a first end and a second end; the coolant regulator is arranged at the inlet of the first end of the hydrogen heat exchanger.

[0009] The first end of the hydrogen heat exchanger is used for the flow of coolant before heat exchange; and the second end of the hydrogen heat exchanger is used for the flow of coolant after heat exchange.

[0010] In one possible implementation, the coolant regulator is a three-way coolant control valve; the three-way coolant control valve has a first connecting port, a second connecting port and a third connecting port.

[0011] The three-way coolant control valve is connected in series on the first end of the hydrogen heat exchanger through the first connecting port and the second connecting port, and the third connecting port is connected with the second end of the hydrogen heat exchanger, so that the bypass branch of the third connecting port is opened when the hydrogen temperature reaches a first preset temperature, and the coolant flow from the first connecting port to the second connecting port is adjusted by the valve.

[0012] In a possible implementation, the coolant regulator is a two-way coolant control valve; the two-way coolant control valve has two connecting ports;

[0013] The two-way coolant control valve is connected in series on the first end of the hydrogen heat exchanger through the two connecting ports, so as to determine the opening and closing state of the valve according to the hydrogen temperature, and adjust the piston inside the valve to control the coolant flow into the first end of the hydrogen heat exchanger.

[0014] In a possible implementation, the coolant regulator comprises a thermostat provided with a temperature sensing bag and a thermostat valve.

[0015] The thermostat valve is arranged at the inlet of the first end of the hydrogen heat exchanger, so as to determine whether to cut off the cooling circuit when the temperature sensing bag melts based on the phase change of the hydrogen temperature, to control the coolant flow into the first end of the hydrogen heat exchanger.

[0016] In a possible implementation, the coolant regulator is configured to determine a first spool position change when the hydrogen temperature reaches a first preset temperature, and reduce the coolant flow into the first end of the hydrogen heat exchanger through the first spool position change.

[0017] In a possible implementation, the coolant regulator is further configured to determine a second spool position change when the hydrogen temperature reaches a second preset temperature, and increase the coolant flow into the first end of the hydrogen heat exchanger through the second spool position change.

[0018] In a possible implementation, the coolant regulator is further configured to determine a second spool position change when the hydrogen temperature reaches a second preset temperature, and increase the coolant flow into the first end of the hydrogen heat exchanger through the second spool position change.

[0019] The high-pressure pressure reducer is configured to reduce the pressure of the hydrogen gas output from the hydrogen storage bottle, and provide the hydrogen gas to the cooling circuit device for adjusting the hydrogen temperature, so that the adjusted hydrogen temperature is within a target temperature range.

[0020] The circulating hydrogen supply device is used for circulating and supplying hydrogen in a target temperature range to the electric pile for electrochemical reaction.

[0021] In a possible implementation, the circulating hydrogen supply device comprises a hydrogen supply valve, a proportional valve, a hydrogen liquid separator and a hydrogen recirculation pump.

[0022] The hydrogen supply valve, the proportional valve and the electric pile are sequentially connected to form a hydrogen supply branch for delivering hydrogen to the electric pile.

[0023] In a possible implementation, the circulating hydrogen supply device further comprises a plurality of temperature sensors and a plurality of pressure sensors.

[0024] The plurality of temperature sensors are respectively arranged on the hydrogen pipeline to detect the hydrogen temperature at each detection point on the hydrogen pipeline in real time.

[0025] The plurality of pressure sensors are respectively arranged on the hydrogen pipeline to detect the hydrogen pressure at each detection point on the hydrogen pipeline in real time.

[0026] The fuel cell system and the cooling circuit device for the fuel cell system are used to form a cooling circuit between the hydrogen heat exchanger in the cooling circuit device and the coolant regulator, and the coolant regulator is electrically connected to the temperature sensor. In this way, the temperature sensor measures the hydrogen temperature entering the electric pile, and the coolant regulator adjusts the flow rate of the coolant flowing through the hydrogen heat exchanger according to the hydrogen temperature, so that the hydrogen temperature output by the hydrogen heat exchanger is within the target temperature range. It can be seen that the adjustment of the coolant regulator makes the temperature of the hydrogen after heat exchange within the appropriate temperature range, thereby avoiding the occurrence of "over-heat exchange" or "under-heat exchange", and the temperature control precision is higher, which is more suitable for the needs of the fuel cell system.

[0027] The other advantages of the present application will be described in more detail in conjunction with the following description and drawings.

[0028] It should be understood that the above description is only a summary of the technical solutions of the present application, so as to enable a general understanding of the technical means of the present application, and then the content of the specification is implemented. In order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific implementation mode of the present application is described below. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced as follows. The drawings herein are incorporated into the description and form a part of the description, which show the embodiments consistent with the present application and are used to illustrate the technical scheme of the present application together with the description. It should be understood that the drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope of protection, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings. Moreover, the same reference numerals are used to represent the same components throughout the drawings. In the drawings:

[0030] Figure 1 A module schematic diagram of a fuel cell system is shown;

[0031] Figure 2 A block diagram of a fuel cell system is shown;

[0032] Figure 3 A module schematic diagram of a cooling loop device for a fuel cell system is shown;

[0033] Figure 4 An application block diagram of a cooling loop device for a fuel cell system is shown;

[0034] Figure 5 An application block diagram of another cooling loop device for a fuel cell system is shown;

[0035] Figure 6 An application block diagram of still another cooling loop device for a fuel cell system is shown.

[0036] Illustration:

[0037] 10-cooling loop device; 20-hydrogen storage bottle; 30-high pressure reducer; 40-circulating hydrogen supply device; 11-hydrogen heat exchanger, 12-temperature sensor; 13-coolant regulator; 41-electric pile; 42-hydrogen supply valve, 43-proportional valve, 44-hydrogen liquid separator, 45-hydrogen recirculation pump; 46-pulse exhaust valve, 47-drain valve, 48-exhaust pipe; 11a-first end; 11b-second end; 1311-thermostat valve; 1312-temperature sensing bag; 132-bidirectional coolant control valve; 133-three-way coolant control valve. DETAILED DESCRIPTION

[0038] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms without being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0039] In the description of the embodiments of the present application, it should be understood that terms such as "comprise" or "have" are intended to indicate that there exist the features, numbers, steps, actions, parts, parts or combinations thereof in the specification, and do not exclude the possibility of existence of one or more other features, numbers, steps, actions, parts, parts or combinations thereof.

[0040] Unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" herein is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist together, and B exists alone.

[0041] The terms "first", "second", and the like are only used to distinguish the same or similar technical features for the purpose of description and cannot be understood as indicating or implying relative importance or quantity of the technical features. Therefore, the features defined by "first", "second", and the like can explicitly or implicitly include one or more such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of the term "a plurality of" is two or more than two.

[0042] It is found through research that most of the existing cooling circuits directly regulate the temperature through heat exchange devices, and the regulation accuracy is not high, so it is likely to cause adverse effects of "excessive heat exchange" or "insufficient heat exchange".

[0043] In actual application, when the hydrogen temperature entering the pressure control valve (PCV), such as proportional valve, injector, is too high (such as temperature ≥ 70℃) or too low (temperature ≤-40℃), it will cause sealing challenges and significantly affect the flow characteristics, and will also affect the PCV control accuracy and downstream pressure fluctuation. In addition, when the dry hydrogen temperature is low and mixed with wet hydrogen from the recirculation loop, it will cause water vapor to condense into liquid water, and the liquid water flowing into the stack will cause some battery flooding phenomenon, eventually leading to more severe degradation than other batteries. It can be seen that the existing regulation scheme cannot meet the needs of the fuel cell system.

[0044] To at least partially solve one or more of the above problems and other potential problems, the utility model provides a kind of fuel cell system and cooling circuit device for fuel cell system, by the accurate regulation and control of hydrogen temperature on cooling circuit, provide better fuel cell system solution.

[0045] To facilitate understanding of the embodiments of the utility model, next first to the fuel cell system provided by the embodiments of the utility model are described in detail.As shown in Figure 1 It is the architecture diagram of the fuel cell system of the embodiments of the utility model, and the system includes cooling circuit device 10 for fuel cell system, also includes hydrogen storage bottle 20, high-pressure pressure reducer 30 and circulating hydrogen supply device 40;Hydrogen storage bottle 20, high-pressure pressure reducer 30, cooling circuit device 10 and circulating hydrogen supply device 40 are sequentially connected;Wherein:

[0046] High-pressure pressure reducer 30 is used to reduce the pressure of hydrogen gas exported from hydrogen storage bottle 20, and provide to cooling circuit device 10 to adjust hydrogen temperature, so that the hydrogen temperature after adjustment is in target temperature range;

[0047] Circulating hydrogen supply device 40 is used to supply hydrogen in target temperature range to the stack to carry out electrochemical reaction.

[0048] The cooling circuit device 10 therein is mainly used to adjust hydrogen temperature, so that the hydrogen temperature after adjustment is in target temperature range, and the temperature range is the best working range of fuel cell, such as a temperature range of about 70 °C, and can also be a more suitable temperature range determined by adapting different application scenarios, which is not specifically limited here.

[0049] It should be noted that hydrogen heat exchanger, as a key component in cooling circuit device 10, can realize cooling by its cooling function when the temperature exceeds the battery working temperature range in actual application, and similarly, realize heating by its heat exchange function when the temperature is less than the battery working temperature range. Next, the temperature control and regulation principle here will be described in conjunction with a specific system example.

[0050] After hydrogen charging is completed in hydrogen storage bottle 20, the gas temperature in hydrogen storage bottle 20 will be as high as 85 ℃, and due to Joule-Thomson effect, hydrogen temperature can further rise after hydrogen is decompressed in high-pressure pressure reducer 30 (for example, hydrogen in hydrogen storage bottle 20 is decompressed from high pressure of 3-35 MPa to medium pressure of 1.5 MPa), at this time, the temperature control function of cooling circuit device 10 can make the hydrogen temperature after adjustment sufficient to meet the needs of fuel cell system. In this way, circulating hydrogen supply device 40 can be used to supply hydrogen in target temperature range to the stack to carry out electrochemical reaction.

[0051] AsFigure 2 As shown in the utility model embodiment, the circulating hydrogen supply device 40 mainly comprises a hydrogen supply valve 42, a proportional valve 43, a hydrogen liquid separator 44 and a hydrogen recirculation pump 45.

[0052] The hydrogen supply valve 42, the proportional valve 43 and the stack 41 are sequentially connected to form a hydrogen supply branch for supplying hydrogen to the stack 41; the hydrogen liquid separator 44, the hydrogen recirculation pump 45 and the stack 41 are sequentially connected to form a circulating branch for circulating hydrogen after the stack 41 reacts.

[0053] In addition, as shown in the utility model embodiment, the fuel cell system can further comprise a pulse exhaust valve 46, a drain valve 47 and an exhaust pipe 48 to discharge water vapor separated by the hydrogen liquid separator 44 out of the system, and the specific implementation process can be realized in combination with the actual functions of the above-mentioned components, which will not be described here. Figure 2

[0054] In order to better ensure the normal operation of the fuel cell system, the fuel cell system in the utility model embodiment can be further provided with a plurality of temperature sensors and a plurality of pressure sensors; by arranging the plurality of temperature sensors on the hydrogen pipeline, the hydrogen temperature at each detection point on the hydrogen pipeline can be detected in real time; by arranging the plurality of pressure sensors on the hydrogen pipeline, the hydrogen pressure at each detection point on the hydrogen pipeline can be detected in real time. As shown in the utility model embodiment, P1 and P2 are two example pressure detection points, and T1 and T2 are two example temperature detection points. Figure 2

[0055] Considering the key role of the cooling circuit device 10 in the entire fuel cell system, the specific structure and working principle of the above-mentioned cooling circuit device 10 will be described in detail in combination with the entire system. As shown in the utility model embodiment, a module schematic diagram of the cooling circuit device 10 is provided, which mainly comprises a hydrogen heat exchanger 11, a temperature sensor 12 and a coolant regulator 13, the hydrogen heat exchanger 11 and the coolant regulator 13 form a cooling circuit, and the coolant regulator 13 is electrically connected with the temperature sensor 12; wherein: Figure 3 The temperature sensor 12 is used for measuring the hydrogen temperature entering the stack 41.

[0056] The coolant regulator 13 is used for adjusting the coolant flow through the hydrogen heat exchanger 11 according to the hydrogen temperature, so that the hydrogen temperature output by the hydrogen heat exchanger 11 is within a target temperature range.

[0057]

[0058] ​​​The cooling loop device 10 provided by the embodiment of the utility model through the adjustment of the coolant regulator 13 makes the hydrogen temperature finally passing through the hydrogen heat exchanger 11 be in the proper temperature range, which mainly considers that the existing system architecture will cause "overheat exchange" when not needing to exchange heat for hydrogen and "underheat exchange" when needing to increase heat exchange, and "overheat exchange" will cause the hydrogen temperature out of the heat exchanger to be too high to affect the performance and durability of the downstream valve, and "underheat exchange" will cause the hydrogen temperature out of the heat exchanger to be too low to affect the durability of the electric pile after mixing with wet hydrogen to condense liquid water into the stack, and the adjustment scheme adopted by the embodiment of the utility model well avoids the occurrence of "overheat exchange" or "underheat exchange", the temperature control precision is higher, and it is more suitable for the demand of the fuel cell system.

[0059] The temperature sensor 12 here measures the hydrogen temperature entering the electric pile 41 in real time, and in actual application, can be arranged downstream of the hydrogen heat exchanger 11, can also be arranged on the peripheral pipeline of the hydrogen heat exchanger 11, or can be other detection point positions sufficient to support the coolant regulator 13 to regulate the coolant flow, and here is not specifically limited.

[0060] Next, the specific implementation structure of the cooling loop device 10 for the fuel cell system provided by the embodiment of the utility model will be described in combination with the system architecture diagram shown in the figure. Figures 4 to 6 The hydrogen heat exchanger 11 includes a first end 11a and a second end 11b; the coolant regulator 13 is arranged at the inlet of the first end 11a of the hydrogen heat exchanger 11; and wherein:

[0061] The first end 11a of the hydrogen heat exchanger 11 is used for the coolant flowing in before heat exchange; and the second end 11b of the hydrogen heat exchanger 11 is used for the coolant flowing out after heat exchange.

[0062] In this way, when the hydrogen temperature reaches the first preset temperature, the coolant regulator 13 can determine the first spool position change and reduce the coolant flow flowing into the first end 11a of the hydrogen heat exchanger 11 through the first spool position change; and when the hydrogen temperature reaches the second preset temperature, the coolant regulator 13 can determine the second spool position change and increase the coolant flow flowing into the first end 11a of the hydrogen heat exchanger 11 through the second spool position change.

[0063] It is known that the coolant regulator 13 in the embodiment of the utility model can reduce the coolant flow into the first end 11a of the hydrogen heat exchanger 11 through the first valve core position change when the hydrogen temperature is relatively low, for example, less than 60℃, thereby avoiding the hydrogen temperature out of the heat exchanger being too low caused by "over heat exchange" and affecting the durability of the electric pile after mixing with wet hydrogen; also can increase the coolant flow into the first end 11a of the hydrogen heat exchanger 11 through the second valve core position change when the hydrogen temperature is relatively high, for example, greater than 70℃, thereby avoiding the hydrogen temperature out of the heat exchanger being too high caused by "under heat exchange" and affecting the performance and durability of the downstream valve.

[0064] For the first valve core position change, the specific reducible coolant flow can be determined based on the first change amount between the preset valve core position and the changed position; similarly, for the second valve core position change, the specific increasable coolant flow can be determined based on the second change amount between the preset valve core position and the changed position.

[0065] The adjustment principles specifically implemented by different types of coolant regulators 13 are slightly different, and three kinds of coolant regulators 13 will be described in the following.

[0066] Firstly, as shown in the figure, Figure 4 The coolant regulator 13 here is a thermostat, and the thermostat has a thermostat valve 1311 and a temperature sensing bag 1312; wherein:

[0067] The temperature sensing bag 1312 is connected with the hydrogen heat exchanger 11, and the thermostat valve 1311 is arranged at the inlet of the first end 11a of the hydrogen heat exchanger 11, for determining whether to cut off the cooling circuit when the temperature sensing bag 1312 melts based on the phase change of the hydrogen temperature, so as to control the coolant flow into the first end 11a of the hydrogen heat exchanger 11.

[0068] Here, the thermostat valve 1311 will be used to avoid overheating. When the hydrogen heat exchanger 11 reaches a certain temperature (such as 60℃), the temperature sensing bag 1312 detects the hydrogen temperature, and the position of the thermostat valve 1311 will change to reduce the coolant flow, and will be completely closed when the temperature continues to rise to a higher temperature (such as 70℃).

[0069] In the actual working process, when the coolant temperature rises to a certain temperature, the heat will be conducted to the temperature sensing bag 1312 of the thermostat, so that the internal solid material of the temperature sensing bag 1312 melts to change the position of the thermostat valve 1311, until it is fully opened. In other words, when the target temperature range is not reached, the coolant flow can be reduced or even controlled to 0 for heating. Therefore, the hydrogen temperature flowing into the downstream will not be higher than the limit value.

[0070] Secondly, as shown in the figure,Figure 5 As shown, the coolant regulator 13 here is a two-way coolant control valve 132; the two-way coolant control valve has two connection ports; wherein:

[0071] The bidirectional coolant control valve 132 is connected in series with the first end 11a of the hydrogen heat exchanger 11 through two connection ports. It is used to determine the opening and closing state of the valve according to the hydrogen temperature, and adjust the piston inside the valve in the opening and closing state to control the flow rate of coolant flowing into the first end 11a of the hydrogen heat exchanger 11.

[0072] Here, a two-way coolant control valve 132 will be used to control the hydrogen temperature. In practical applications, for example, when the temperature T3 measured by temperature sensor 12 reaches a certain temperature (e.g., 60°C), the two-way coolant control valve 132 will attempt to reduce the coolant flow rate and completely close when the temperature continues to rise to a higher temperature (e.g., 70°C). In other words, when the hydrogen temperature is higher than the target temperature range, the coolant flow rate will be increased; conversely, when it is lower than the target temperature range, the coolant flow rate can be reduced or even controlled to 0. Therefore, the temperature of the hydrogen flowing downstream will not exceed the limit value.

[0073] Thirdly, such as Figure 6 As shown, the coolant regulator 13 here is a three-way coolant control valve 133; the three-way coolant control valve 133 has a first connection port, a second connection port, and a third connection port; wherein:

[0074] The three-way coolant control valve 133 is connected in series with the first and second connection ports to the first end 11a of the hydrogen heat exchanger 11, and the third connection port is connected to the second end 11b of the hydrogen heat exchanger 11. It is used to open the bypass branch of the third connection port when the hydrogen temperature reaches the first preset temperature, and adjust the coolant flow rate from the first connection port to the second connection port through the valve.

[0075] Here, considering that in practical applications, the hydrogen heat exchanger 11 may be connected in series with other components such as deionizers and ion exchange filters, the coolant should not be cut off in such cases to avoid affecting the important functions of other components. Therefore, this embodiment of the invention uses a three-way coolant control valve 133 to control the coolant flow rate. For example, when the temperature T3 measured by the temperature sensor 12 reaches a certain temperature (e.g., 60°C), the three-way coolant control valve 133 will attempt to bypass the flow, reducing the coolant flow rate downstream as the temperature continues to rise to a higher temperature (e.g., 70°C). Therefore, the temperature of the hydrogen flowing downstream will not exceed the limit value.

[0076] No matter whether mechanical thermostat adjustment mode or two-way, three-way coolant control valve adjustment mode is adopted, the cooling circuit device 10 provided by the embodiment of the utility model can realize hydrogen temperature control, higher regulation and control precision, thereby effectively avoiding the occurrence of problems such as 'over heat exchange', 'under heat exchange', further can satisfy the demand of fuel cell system, more practical.

[0077] In the description of the present specification, the description referring to the terms "some possible embodiments", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the utility model, and the above terms do not necessarily represent the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples and the features of different embodiments or examples described in the specification without contradiction.

[0078] Although the spirit and principles of the utility model have been described above with reference to several specific embodiments, it should be understood that the utility model is not limited to the disclosed specific embodiments, and the division of aspects does not mean that the features in these aspects cannot be combined. The utility model is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims.

Claims

1. A cooling circuit device for a fuel cell system, characterized by, include: The system includes a hydrogen heat exchanger, a temperature sensor, and a coolant regulator, wherein the hydrogen heat exchanger and the coolant regulator form a cooling circuit, and the coolant regulator is electrically connected to the temperature sensor. The temperature sensor is used to measure the temperature of the hydrogen entering the fuel cell stack; The coolant regulator is used to adjust the flow rate of the coolant flowing through the hydrogen heat exchanger according to the hydrogen temperature, so that the hydrogen temperature output by the hydrogen heat exchanger is within the target temperature range.

2. The cooling circuit apparatus for a fuel cell system according to claim 1, characterized by, The hydrogen heat exchanger includes a first end and a second end; the coolant regulator is disposed at the inlet of the first end of the hydrogen heat exchanger. The first end of the hydrogen heat exchanger is used for the inflow of coolant before heat exchange; the second end of the hydrogen heat exchanger is used for the outflow of coolant after heat exchange.

3. The cooling circuit device for a fuel cell system according to claim 2, characterized by, The coolant regulator includes a three-way coolant control valve; the three-way coolant control valve has a first connection port, a second connection port and a third connection port; The three-way coolant control valve is connected in series at the first end of the hydrogen heat exchanger through the first connection port and the second connection port, and the third connection port is connected to the second end of the hydrogen heat exchanger. It is used to open the bypass branch of the third connection port when the hydrogen temperature reaches the first preset temperature, and adjust the coolant flow rate from the first connection port to the second connection port through the valve.

4. The cooling circuit apparatus for a fuel cell system according to claim 2, characterized by The coolant regulator includes a two-way coolant control valve; the two-way coolant control valve has two connection ports; The bidirectional coolant control valve is connected in series at the first end of the hydrogen heat exchanger through the two connection ports. It is used to determine the opening and closing state of the valve according to the hydrogen temperature, and to adjust the piston inside the valve in the opening and closing state to control the flow rate of coolant flowing into the first end of the hydrogen heat exchanger.

5. The cooling circuit apparatus for a fuel cell system according to claim 2, characterized by The coolant regulator includes a thermostat equipped with a temperature sensing bulb and a thermostat valve; The thermostat valve is located at the inlet of the first end of the hydrogen heat exchanger and is used to determine whether to cut off the cooling circuit when the temperature sensing bulb undergoes a phase change and melts based on the hydrogen temperature, so as to control the flow rate of coolant flowing into the first end of the hydrogen heat exchanger.

6. The cooling circuit apparatus for a fuel cell system according to claim 2, characterized by The coolant regulator is used to determine the change in the position of the first valve core when the hydrogen temperature reaches a first preset temperature, and to reduce the flow rate of coolant flowing into the first end of the hydrogen heat exchanger by changing the position of the first valve core.

7. The cooling circuit apparatus for a fuel cell system according to claim 2, characterized by The coolant regulator is also used to determine the change in the position of the second valve core when the hydrogen temperature reaches the second preset temperature, and to increase the coolant flow rate into the first end of the hydrogen heat exchanger by changing the position of the second valve core.

8. A fuel cell system characterized by comprising: include: The cooling circuit device for a fuel cell system according to any one of claims 1 to 7 further includes a hydrogen storage tank, a high-pressure regulator, and a circulating hydrogen supply device; the hydrogen storage tank, the high-pressure regulator, the cooling circuit device, and the circulating hydrogen supply device are connected in sequence. The high-pressure pressure reducer is used to reduce the pressure of the hydrogen gas output from the hydrogen storage cylinder and to provide it to the cooling circuit device for regulating the hydrogen gas temperature so that the regulated hydrogen gas temperature is within the target temperature range. The circulating hydrogen supply device is used for circulating and supplying hydrogen in a target temperature range to the electric pile for electrochemical reaction.

9. The fuel cell system of claim 8, wherein, The circulating hydrogen supply device comprises a hydrogen supply valve, a proportional valve, a hydrogen liquid separator and a hydrogen recirculation pump. The hydrogen supply valve, the proportional valve and the electric pile are sequentially connected to form a hydrogen supply branch for conveying hydrogen to the electric pile.

10. The fuel cell system according to claim 8 or 9, characterized by The hydrogen liquid separator, the hydrogen recirculation pump and the electric pile are sequentially connected to form a circulation branch for circulating hydrogen after reaction of the electric pile. A plurality of temperature sensors and a plurality of pressure sensors are further included. The plurality of temperature sensors are respectively arranged on the hydrogen pipeline for real-time detection of hydrogen temperature at each detection point on the hydrogen pipeline. The plurality of pressure sensors are respectively arranged on the hydrogen pipeline for real-time detection of hydrogen pressure at each detection point on the hydrogen pipeline.

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