A thermal management system and water electrolysis hydrogen production system

Abstract

The present invention discloses a thermal management system and a water electrolysis hydrogen production system, comprising: a gas-liquid separator; a first heat exchanger for cooling separated gas output by the gas-liquid separator, wherein the cold liquid inlet of the first heat exchanger is connected to the liquid output pipeline of the gas-liquid separator via a first pipeline, and the cold liquid outlet of the first heat exchanger is directed to the gas-liquid separator via a second pipeline; a circulating pump for providing power for the circulation of coolant within the first heat exchanger, the first pipeline, and the second pipeline; wherein a first pipeline shut-off valve is provided on the first pipeline. The thermal management system cools the separated gas output by the gas-liquid separator through heat exchange by the first heat exchanger, fully utilizing the lower temperature electrolyte, thereby reducing the amount of cooling water used in the separated gas cooling heat exchanger, and even allowing the separated gas cooling heat exchanger to be shut down, thereby helping to reduce the operating cost of the water electrolysis hydrogen production system.

Description

Technical Field

[0001] The present invention relates to the field of thermal management technology, and more particularly to a thermal management system and a water electrolysis hydrogen production system. Background Art

[0002] At present, water electrolysis hydrogen production equipment tends to develop in the direction of large-scale and variable power hydrogen production; currently large-scale equipment adopts the method of multiple electrolytic cells for a set of post-processing systems, and the cooling requirements of the heat exchangers on the hydrogen production side and the oxygen production side are large, and the system operating costs are high.

[0003] In summary, how to solve the problem of high operating costs of water electrolysis hydrogen production systems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a thermal management system and a water electrolysis hydrogen production system to solve the problem of high operating costs of the water electrolysis hydrogen production system.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A thermal management system for a water electrolysis hydrogen production system, comprising:

[0007] Gas-liquid separator;

[0008] a first heat exchanger, configured to cool the separated gas outputted from the gas-liquid separator, wherein a cold liquid inlet of the first heat exchanger is connected to a liquid output pipeline of the gas-liquid separator via a first pipeline, and a cold liquid outlet of the first heat exchanger is led to the gas-liquid separator via a second pipeline;

[0009] a circulation pump, used to provide power for the circulation of coolant in the first heat exchanger, the first pipeline, and the second pipeline;

[0010] Wherein, a first pipeline shut-off valve is provided on the first pipeline.

[0011] Optionally, a temperature detector is further included, and the temperature detector is used to detect the temperature of the electrolyte in the gas-liquid separator or in the liquid output pipeline.

[0012] Optionally, a controller is further included, and the first pipeline shut-off valve is an electrically controlled valve. The controller is communicatively connected to the temperature detector and the first pipeline shut-off valve respectively, so as to control the opening and closing of the first pipeline shut-off valve according to the electrolyte temperature value detected by the temperature detector.

[0013] Optionally, when the electrolyte temperature value detected by the temperature detector exceeds a preset temperature upper limit, the controller controls the first pipeline shut-off valve to close; when the electrolyte temperature value detected by the temperature detector is lower than a preset temperature lower limit, the controller controls the first pipeline shut-off valve to open.

[0014] Optionally, a second heat exchanger is further included for performing heat exchange and cooling on the airflow output by the first heat exchanger. A flow control valve is provided on the cooling circulation pipeline connected to the second heat exchanger. The flow control valve is communicatively connected to the controller. When the first pipeline shut-off valve is closed, the controller can control the flow of the flow control valve to increase; when the first pipeline shut-off valve is opened, the controller can control the flow of the flow control valve to decrease or close.

[0015] Optionally, the gas-liquid separator is a hydrogen gas-liquid separator and / or an oxygen gas-liquid separator.

[0016] Optionally, the liquid output pipeline is a converging pipeline of the liquid outlet pipeline of the hydrogen gas-liquid separator and the liquid outlet pipeline of the oxygen gas-liquid separator.

[0017] Optionally, a second pipeline check valve is further provided on the second pipeline for preventing the gas in the gas-liquid separator from entering the interior of the first heat exchanger.

[0018] Optionally, the gas circulation cavity of the first heat exchanger is further provided with a liquid collecting structure for collecting condensed liquid, and the liquid collecting structure is connected to the gas-liquid separator through a third pipeline.

[0019] Optionally, the circulation pump is provided on the liquid output pipeline and is located upstream of a connection node between the first pipeline and the liquid output pipeline.

[0020] Optionally, the circulation pump is arranged on the first pipeline.

[0021] Compared with the background technology introduction, the above-mentioned thermal management system is used for the water electrolysis hydrogen production system, including: a gas-liquid separator; a first heat exchanger, used to cool the separated gas output by the gas-liquid separator, and the cold liquid inlet of the first heat exchanger is connected to the liquid output pipeline of the gas-liquid separator through a first pipeline, and the cold liquid outlet of the first heat exchanger is drained to the gas-liquid separator through a second pipeline; a circulating pump, used to provide power for the circulation of coolant in the first heat exchanger, the first pipeline and the second pipeline; wherein, a first pipeline shut-off valve is provided on the first pipeline. In actual application of this thermal management system, since the cold liquid inlet of the first heat exchanger is connected to the liquid output pipeline of the gas-liquid separator through the first pipeline, and the cold liquid outlet of the first heat exchanger is drained to the gas-liquid separator through the second pipeline, when the temperature of the electrolyte in the gas-liquid separator is low, the electrolyte in the liquid output pipeline of the gas-liquid separator can be transported to the first heat exchanger by opening the first pipeline shut-off valve and the circulation pump, and the separated gas output by the gas-liquid separator is cooled by heat exchange through the first heat exchanger, which makes full use of the electrolyte with a low temperature, thereby reducing the amount of cooling water used in the cooling heat exchanger of the separated gas, and even the cooling heat exchanger of the separated gas can be turned off, thereby helping to reduce the operating cost of the electrolytic water hydrogen production system.

[0022] In addition, the present invention further provides a hydrogen production system by electrolysis, including a thermal management system, such as that described in any of the above-mentioned solutions. Since the thermal management system has the above-mentioned technical effects, a hydrogen production system by electrolysis having the thermal management system should also have corresponding technical effects, which will not be further described here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of a thermal management system provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of a thermal management system provided by an embodiment of the present invention arranged on the hydrogen side of a water electrolysis hydrogen production system;

[0026] Figure 3 A schematic diagram showing a thermal management system provided in an embodiment of the present invention arranged on the oxygen side of a water electrolysis hydrogen production system;

[0027] Figure 4A schematic diagram showing a thermal management system provided in an embodiment of the present invention being arranged on both the hydrogen and oxygen sides of a water electrolysis hydrogen production system, with independent circulation pumps providing power on both sides;

[0028] Figure 5 A schematic diagram showing a thermal management system provided in an embodiment of the present invention, arranged simultaneously on the hydrogen side and the oxygen side of a water electrolysis hydrogen production system, with both sides using a common circulation pump to provide power.

[0029] in, Figure 1-Figure 5 middle:

[0030] Gas-liquid separator 1, hydrogen gas-liquid separator 1a, oxygen gas-liquid separator 1b, liquid output pipeline 2, oxygen heat exchanger 3a, hydrogen heat exchanger 3b, oxygen pipeline regulating valve 4, oxygen vent pipeline shut-off valve 5, oxygen outlet pipeline shut-off valve 6, oxygen outlet pipeline check valve 7, first heat exchanger 8, first pipeline 81, second pipeline 82, second heat exchanger 9, hydrogen pipeline regulating valve 10, hydrogen outlet pipeline shut-off valve 11, hydrogen outlet pipeline check valve 12, hydrogen vent pipeline shut-off valve 13, second pipeline check valve 14, circulation pump 15, first pipeline shut-off valve 16, electrolyte heat exchanger 17, electrolyzer 18, temperature detector 19. DETAILED DESCRIPTION

[0031] The core of the present invention is to provide a thermal management system and a water electrolysis hydrogen production system to solve the problem of high operating costs of the water electrolysis hydrogen production system.

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1 Schematic diagram of a thermal management system provided by an embodiment of the present invention arranged on the hydrogen side of a water electrolysis hydrogen production system.

[0034] An embodiment of the present invention provides a thermal management system for a water electrolysis hydrogen production system, comprising a gas-liquid separator 1, a first heat exchanger 8 and a circulation pump 15; wherein, the first heat exchanger 8 is used to cool the separated gas output by the gas-liquid separator 1, and the cold liquid inlet of the first heat exchanger 8 is connected to the liquid output pipeline 2 of the gas-liquid separator through a first pipeline 81, and the cold liquid outlet of the first heat exchanger 8 is drained to the gas-liquid separator 1 through a second pipeline 82; the circulation pump 15 is used to provide power for the circulation of the coolant in the first heat exchanger 8, the first pipeline 81 and the second pipeline 82; a first pipeline shut-off valve 16 is provided on the first pipeline 81.

[0035] In actual application of this thermal management system, since the cold liquid inlet of the first heat exchanger 8 is connected to the liquid output pipeline 2 of the gas-liquid separator 1 through the first pipeline 81, and the cold liquid outlet of the first heat exchanger 8 is drained to the gas-liquid separator through the second pipeline 82, when the temperature of the electrolyte in the gas-liquid separator 1 is low, the electrolyte in the liquid output pipeline 2 of the gas-liquid separator 1 can be transported to the first heat exchanger 8 by opening the first pipeline shut-off valve 16 and the circulation pump 15. The separated gas output from the gas-liquid separator 1 is subjected to heat exchange and cooling by the first heat exchanger 8, thereby making full use of the electrolyte with a lower temperature. This can reduce the amount of cooling water used in the cooling heat exchanger for the separated gas, and can even shut down the cooling heat exchanger for the separated gas, thereby helping to reduce the operating cost of the water electrolysis hydrogen production system. In addition, through the above-mentioned thermal management system, the electrolyte can be better utilized for pre-heat exchange, which will make the water content of the hydrogen entering the subsequent first heat exchanger 8 lower, improve the gas-liquid separation effect, and the lower dew point of the obtained hydrogen will help improve the quality of the hydrogen.

[0036] In some specific implementation schemes, the specific application of the thermal management system in the water electrolysis hydrogen production system can be in the following forms:

[0037] The first form, refer to Figure 2 The thermal management system provided in an embodiment of the present invention is arranged on the hydrogen side of the electrolytic water hydrogen production system. The above-mentioned gas-liquid separator 1 can specifically be a hydrogen gas-liquid separator 1a located on the hydrogen side of the electrolytic water hydrogen production system, and the corresponding first heat exchanger 8 is used to cool the hydrogen separated by the hydrogen gas-liquid separator 1a.

[0038] The second form, refer to Figure 3 The thermal management system provided in an embodiment of the present invention is arranged on the oxygen side of the electrolytic water hydrogen production system. The above-mentioned gas-liquid separator 1 can specifically be an oxygen gas-liquid separator 1b located on the oxygen side of the electrolytic water hydrogen production system. The corresponding first heat exchanger 8 is used to cool the oxygen separated by the oxygen gas-liquid separator 1b. This method is similar to the first form, except that the first form is the thermal management system applied to the thermal management of the hydrogen production side in the electrolytic water hydrogen production system, while the second form is the thermal management system applied to the thermal management of the oxygen production side in the electrolytic water hydrogen production system.

[0039] The third form, refer to Figure 4The thermal management system provided in an embodiment of the present invention is arranged simultaneously on the hydrogen side and the oxygen side of the water electrolysis hydrogen production system, and the two sides are powered by independent circulation pumps. The gas-liquid separator 1 can specifically include a hydrogen gas-liquid separator 1a and an oxygen gas-liquid separator 1b. At this time, there are two first heat exchangers 8, one of which is a first heat exchanger 8 arranged on the hydrogen delivery pipeline corresponding to the hydrogen gas-liquid separator 1a, which is used to cool the hydrogen; the other is a first heat exchanger 8 arranged on the oxygen delivery pipeline after separation by the oxygen gas-liquid separator 1b, which is used to cool the oxygen. This method is a combination of the first and second forms above, with similar principles. In this form, the driving sources used for the thermal management of the hydrogen production side and the thermal management of the oxygen production side are independent circulation pumps 15 to provide power for their respective electrolyte circulations.

[0040] The fourth form, refer to Figure 5 The thermal management system provided in an embodiment of the present invention is arranged simultaneously on the hydrogen side and the oxygen side of the water electrolysis hydrogen production system, and a schematic diagram of a common circulation pump is used to provide power for both sides. At this time, the gas-liquid separator 1 can specifically include a hydrogen gas-liquid separator 1a and an oxygen gas-liquid separator 1b at the same time. At this time, there are specifically two first heat exchangers 8, one of which is a first heat exchanger 8 arranged on the hydrogen delivery pipeline corresponding to the hydrogen gas-liquid separator 1a, which is used to cool the hydrogen; the other is a first heat exchanger 8 arranged on the oxygen delivery pipeline after separation by the oxygen gas-liquid separator 1b, which is used to cool the oxygen. The difference between this method and the third form above is that the driving source used for the thermal management of the hydrogen production side and the thermal management of the oxygen production side is a common circulation pump 15 to provide electrolyte circulation power.

[0041] In actual application, the corresponding thermal management form can be selected and configured according to actual needs, and no further specific restrictions are made here.

[0042] It should also be noted that the corresponding single-sided thermal management system (i.e. Figure 2 As shown, the thermal management system is arranged on the hydrogen production side, or as Figure 3 As shown, the circulation pump 15 used by the thermal management system (arranged on the oxygen production side) can be specifically installed on the liquid output pipeline 2, upstream of the connection node between the first pipeline 81 and the liquid output pipeline 2. In this way, a single circulation pump 15 can simultaneously meet the power requirements for electrolyte circulation in the first heat exchanger 8, the first pipeline 81, and the second pipeline 82, as well as the power requirements for the return flow of the liquid output pipeline 2 to the electrolytic cell 18.

[0043] Of course, it can be understood that the above-mentioned arrangement of the circulation pump 15 is only an example of an embodiment of the present invention. In actual application, the circulation pump 15 can also be set on the first pipeline 81. At this time, the electrolyte circulation of the first heat exchanger 8, the first pipeline 81 and the second pipeline 82 adopts an independent power source and is not affected by the operation of the entire water electrolysis hydrogen production system. In actual application, the configuration can be selected according to actual needs, and no more specific limitations are made again.

[0044] In some more specific embodiments, the liquid output pipeline 2 can specifically be a confluence pipeline of the liquid outlet pipeline of the hydrogen gas-liquid separator 1a and the liquid outlet pipeline of the oxygen gas-liquid separator 1b. By designing the liquid output pipeline 2 as a confluence pipeline, the low-temperature electrolyte in the liquid outlet pipeline of the hydrogen gas-liquid separator 1a and the low-temperature electrolyte in the liquid outlet pipeline of the oxygen gas-liquid separator 1b can be used at the same time, resulting in a higher utilization rate. Of course, it is understandable that in actual application, the liquid output pipeline 2 can also be only the liquid outlet pipeline of the hydrogen gas-liquid separator 1a, or only the liquid outlet pipeline of the oxygen gas-liquid separator 1b, and can be specifically configured according to actual needs.

[0045] In some specific embodiments, reference Figure 1 and Figure 2-Figure 5 As shown, the thermal management system may further include a temperature detector 19, which may be specifically disposed on the gas-liquid separator for detecting the electrolyte temperature within the gas-liquid separator, or may be disposed on the liquid output pipeline 2 for detecting the electrolyte temperature within the liquid output pipeline 2. By arranging the temperature detector 19, the electrolyte temperature within the gas-liquid separator can be detected in real time, thereby facilitating the operation of the first pipeline shut-off valve 16. For example, during long-term low-power hydrogen production in the system, the electrolyte temperature within the system rises very slowly. When the electrolyte temperature detected by the temperature detector 19 is low, the first pipeline shut-off valve 16 may be controlled to open, and the system then uses its own low-temperature electrolyte to exchange heat with the gas separated by the gas-liquid separator, thereby reducing or even shutting off the amount of cooling water in the cooling heat exchanger in the post-processing. When the electrolyte temperature is high, the first pipeline shut-off valve 16 may be controlled to close, and the cooling heat exchanger in the post-processing is cooled according to the corresponding amount of cooling water, thereby significantly reducing the operating cost of the system.

[0046] In a further embodiment, the thermal management system may further include a controller, wherein the first pipeline shut-off valve 16 may be specifically an electrically controlled valve. The controller is communicatively connected to the temperature detector 19 and the first pipeline shut-off valve 16, respectively, so that the controller can control the opening and closing of the first pipeline shut-off valve 16 based on the electrolyte temperature value detected by the temperature detector 19. By designing a control valve, manual operation is avoided, and the opening and closing of the first pipeline shut-off valve 16 can be automated, which is more intelligent.

[0047] In a further embodiment, the controller may control the opening and closing of the first pipeline shut-off valve 16 in a specific manner: when the electrolyte temperature detected by the temperature detector 19 exceeds a preset upper temperature limit, the controller controls the first pipeline shut-off valve 16 to close; when the electrolyte temperature detected by the temperature detector 19 falls below the preset lower temperature limit, the controller controls the first pipeline shut-off valve 16 to open. By designing the opening and closing of the first pipeline shut-off valve 16 in this manner, frequent opening and closing operations of the first pipeline shut-off valve 16 when the critical opening value is reached can be avoided, thereby helping to increase the service life of the first pipeline shut-off valve 16.

[0048] In a further implementation scheme, the above-mentioned thermal management system may also include a second heat exchanger 9 for heat exchange and cooling the airflow output by the first heat exchanger 8. A flow control valve is provided on the cooling circulation pipeline connected to the second heat exchanger 9, and the flow control valve is communicatively connected to the controller. When the first pipeline shut-off valve 16 is closed, the controller can control the flow of the flow control valve to increase, thereby meeting the cooling requirements of the gas separated by the gas-liquid separator; when the first pipeline shut-off valve 16 is opened, the controller can control the flow of the flow control valve to decrease or close, thereby making full use of the lower temperature electrolyte for heat exchange and cooling.

[0049] In some more specific embodiments, the second pipeline 82 is further provided with a second pipeline check valve 14 for preventing the gas in the gas-liquid separator from entering the first heat exchanger 8. The design of the second pipeline check valve 14 ensures that the separated gas (hydrogen or oxygen) in the gas-liquid separator 1 does not enter the first heat exchanger 8, thereby ensuring the safety of system operation.

[0050] In some specific embodiments, the gas circulation cavity of the first heat exchanger 8 may also be provided with a liquid collection structure for collecting condensed liquid, which is connected to the gas-liquid separator 1 via a third pipeline. By designing the liquid collection structure and the third pipeline, electrolyte condensed in the gas circulation cavity can be collected by the liquid collection structure and then returned to the gas-liquid separator 1 via the third pipeline, which helps improve the gas-liquid separation effect and also reduces electrolyte consumption.

[0051] In addition, the present invention also provides a water electrolysis hydrogen production system, including a thermal management system, and the thermal management system is the thermal management system described in any of the above schemes. Since the above thermal management system has the aforementioned technical effects, the water electrolysis hydrogen production system having the thermal management system should also have corresponding technical effects, which will not be repeated here.

[0052] It should be noted that, referring to Figure 2-Figure 5The electrolysis water hydrogen production system generally includes a hydrogen gas-liquid separator 1a, an oxygen gas-liquid separator 1b, an oxygen heat exchanger 3a, a hydrogen heat exchanger 3b, an oxygen pipeline regulating valve 4, an oxygen vent pipeline shut-off valve 5, an oxygen outlet pipeline shut-off valve 6, an oxygen outlet pipeline check valve 7, a second heat exchanger 9, a hydrogen pipeline regulating valve 10, a hydrogen outlet pipeline shut-off valve 11, a hydrogen outlet pipeline check valve 12, a hydrogen vent pipeline shut-off valve 13, a second pipeline check valve 14, a circulation pump 15 (here refers to the circulation pump on the liquid output pipeline 2 connected to the electrolytic cell 18), a first pipeline shut-off valve 16, an electrolyte heat exchanger 17, an electrolytic cell 18 and a temperature detector 19, etc.

[0053] Working principle of water electrolysis hydrogen production system: refer to Figure 2-Figure 5 When the electrolytic cell 18 is working normally, the electrolyte on the hydrogen side will enter the hydrogen gas-liquid separator 1a together with the hydrogen, and the electrolyte on the oxygen side will enter the oxygen gas-liquid separator 1b together with the oxygen. After gas-liquid separation, the electrolyte will pass through the circulation pump 15 (here refers to the circulation pump on the liquid output pipeline 2 connected to the electrolytic cell 18) into the electrolyte heat exchanger 17 for heat exchange and then return to the electrolytic cell 18.

[0054] Reference Figure 2 Taking the above-mentioned thermal management system arranged on the hydrogen side as an example, the hydrogen separated by the hydrogen gas-liquid separator 1a passes through the first heat exchanger 8 and the second heat exchanger 9 respectively, and then undergoes subsequent processing or venting operations using the hydrogen pipeline regulating valve 10, hydrogen outlet pipeline shut-off valve 11, hydrogen outlet pipeline check valve 12 and hydrogen vent pipeline shut-off valve 13 provided on the subsequent pipeline; the oxygen separated by the oxygen gas-liquid separator 1b passes through the oxygen heat exchanger 3a, and then undergoes subsequent processing or venting operations using the oxygen pipeline regulating valve 4, oxygen vent pipeline shut-off valve 5, oxygen outlet pipeline shut-off valve 6 and oxygen outlet pipeline check valve 7 provided on the subsequent pipeline.

[0055] Reference Figure 3 Taking the above-mentioned thermal management system arranged on the oxygen side as an example, the oxygen separated by the oxygen gas-liquid separator 1b passes through the first heat exchanger 8 and the second heat exchanger 9 respectively, and then enters subsequent processing or venting operations using the oxygen pipeline regulating valve 4, oxygen vent pipeline shut-off valve 5, oxygen outlet pipeline shut-off valve 6 and oxygen outlet pipeline check valve 7 provided on the subsequent pipeline; the hydrogen separated by the hydrogen gas-liquid separator 1a passes through the hydrogen heat exchanger 3b, and then enters subsequent processing or venting operations using the hydrogen pipeline regulating valve 10, hydrogen outlet pipeline shut-off valve 11, hydrogen outlet pipeline check valve 12 and hydrogen vent pipeline shut-off valve 13 provided on the subsequent pipeline.

[0056] Reference Figure 4 and Figure 5Taking the above-mentioned thermal management system arranged on both the hydrogen side and the oxygen side as an example, the hydrogen separated by the hydrogen gas-liquid separator 1a passes through the first heat exchanger 8 and the second heat exchanger 9 respectively, and then undergoes subsequent processing or venting operations using the hydrogen pipeline regulating valve 10, the hydrogen outlet pipeline shut-off valve 11, the hydrogen outlet pipeline check valve 12, and the hydrogen vent pipeline shut-off valve 13 provided on the subsequent pipeline; the oxygen separated by the oxygen gas-liquid separator 1b passes through the first heat exchanger 8 and the second heat exchanger 9 respectively, and then undergoes subsequent processing or venting operations using the oxygen pipeline regulating valve 4, the oxygen vent pipeline shut-off valve 5, the oxygen outlet pipeline shut-off valve 6, and the oxygen outlet pipeline check valve 7 provided on the subsequent pipeline.

[0057] in, Figure 4 and Figure 5 The difference is that Figure 4 The power sources used by the thermal management system arranged on the hydrogen side and the thermal management system arranged on the oxygen side are two circulating pumps arranged independently of each other; Figure 5 The thermal management system arranged on the hydrogen side and the thermal management system arranged on the oxygen side share a common circulating pump as a power source.

[0058] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0059] It should be understood that the use of "system," "device," "unit," and / or "module" in this application is merely a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0060] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0061] In the description of the embodiments of this application, unless otherwise specified, " / " represents or. For example, A / B can represent A or B. "And / or" in this article is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "plurality" means two or more than two.

[0062] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0063] If a flow chart is used in this application, the flow chart is used to illustrate the operations performed by the system according to the embodiments of the application. It should be understood that the previous or subsequent operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. At the same time, other operations can be added to these processes, or one or more operations can be removed from these processes.

[0064] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A thermal management system for a water electrolysis hydrogen production system, characterized in that: include: Gas-liquid separator (1); a first heat exchanger (8) for cooling the separated gas outputted from the gas-liquid separator (1), wherein the cold liquid inlet of the first heat exchanger (8) is connected to the liquid output pipeline (2) of the gas-liquid separator (1) via a first pipeline (81), and the cold liquid outlet of the first heat exchanger (8) is led to the gas-liquid separator (1) via a second pipeline (82), and a first pipeline shut-off valve (16) is provided on the first pipeline (81), and the first pipeline shut-off valve (16) is an electrically controlled valve; a circulation pump (15) for providing power for the circulation of the coolant in the first heat exchanger (8), the first pipeline (81), and the second pipeline (82); a temperature detector (19), the temperature detector (19) being used to detect the temperature of the electrolyte in the gas-liquid separator (1) or in the liquid output pipeline (2); a controller, respectively connected to the temperature detector (19) and the first pipeline shut-off valve (16), for controlling the opening and closing of the first pipeline shut-off valve (16) according to the electrolyte temperature value detected by the temperature detector (19); The second heat exchanger (9) is used to perform heat exchange cooling on the airflow output by the first heat exchanger (8); a flow control valve is provided on the cooling circulation pipeline connected to the second heat exchanger (9); and the flow control valve is communicatively connected to the controller.

2. The thermal management system according to claim 1, wherein: When the electrolyte temperature value detected by the temperature detector (19) exceeds a preset temperature upper limit, the controller controls the first pipeline shut-off valve (16) to close; when the electrolyte temperature value detected by the temperature detector (19) is lower than a preset temperature lower limit, the controller controls the first pipeline shut-off valve (16) to open.

3. The thermal management system according to claim 2, wherein: When the first pipeline shut-off valve (16) is closed, the controller can control the flow of the flow control valve to increase; when the first pipeline shut-off valve (16) is opened, the controller can control the flow of the flow control valve to decrease or close.

4. The thermal management system according to claim 1, wherein: The gas-liquid separator (1) is a hydrogen gas-liquid separator (1a) and / or an oxygen gas-liquid separator (1b).

5. The thermal management system according to claim 1, wherein: The liquid output pipeline (2) is a converging pipeline of the liquid outlet pipeline of the hydrogen gas-liquid separator (1a) and the liquid outlet pipeline of the oxygen gas-liquid separator (1b).

6. The thermal management system according to claim 1, wherein: The second pipeline (82) is also provided with a second pipeline check valve (14) for preventing the gas in the gas-liquid separator from entering the interior of the first heat exchanger (8).

7. The thermal management system according to claim 1, wherein: The gas circulation cavity of the first heat exchanger (8) is also provided with a liquid collecting structure for collecting condensed liquid, and the liquid collecting structure is connected to the gas-liquid separator through a third pipeline.

8. The thermal management system according to claim 1, wherein: The circulation pump (15) is provided on the liquid output pipeline (2) and is located upstream of a connection node between the first pipeline (81) and the liquid output pipeline (2).

9. The thermal management system according to claim 1, wherein: The circulation pump (15) is arranged on the first pipeline (81).

10. A water electrolysis hydrogen production system, including a thermal management system, characterized in that: The thermal management system is the thermal management system according to any one of claims 1 to 9.

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