Electrochemical heat pump system
By setting up an anode product recirculation path and water recirculation in the electrochemical heat pump system, the problem of improper water content in the proton exchange membrane is solved, the electrolyte membrane is fully hydrated and energy consumption is reduced, and the system efficiency and safety are improved.
Patent Information
- Application Number
- CN202422396170.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In existing electrochemical heat pump systems, improper water content in the proton exchange membrane leads to increased ohmic losses or obstructed working fluid transmission, affecting system efficiency and energy consumption.
By setting up an anode product recirculation path in the electrochemical heat pump system, including a condenser, an expansion device, an evaporator and a gas-liquid separator, combined with water recirculation and flow control, the electrolyte membrane is kept fully hydrated, the ohmic loss is reduced and the working fluid transmission is optimized.
Effective hydration of the electrolyte membrane is achieved, system energy consumption and mass transfer loss are reduced, and energy conversion efficiency and system safety are improved.
Smart Images
Figure CN223345691U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of heat pump technology, and more specifically, to an electrochemical heat pump system. Background Art
[0002] The information provided in this section is for the purpose of generally presenting the background of the present disclosure. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present disclosure.
[0003] Electrochemical heat pumps, due to their ability to achieve efficient energy conversion and precise temperature regulation through electrochemical reactions, offer higher energy efficiency and flexible operational control compared to traditional heat pumps that rely on mechanical compression. In existing electrochemical heat pump systems, the battery stack acts as an electrochemically driven working fluid conversion unit. Its efficient operation is highly dependent on the proton conductivity of the proton exchange membrane (PEM), which serves as the conventional electrolyte, and therefore depends on the PEM's fully hydrated state.
[0004] Typically, during electrochemical reactions using a proton exchange membrane as an electrolyte, the water content within the membrane plays a crucial role in its conductivity. Low water content causes the membrane to dry out, increasing the system's ohmic losses. However, when excessive water is added, the membrane becomes saturated with water, potentially hindering the transport of peripheral reactants and leading to excessive power consumption. Utility Model Content
[0005] The present application provides an electrochemical heat pump system to address one or more of the above-mentioned problems and other issues.
[0006] According to one aspect of the present application, there is provided an electrochemical heat pump system, comprising:
[0007] A cell stack comprising an anode chamber, a cathode chamber, and an electrolyte membrane located between the anode chamber and the cathode chamber, wherein the anode chamber is provided with an anode inlet and an anode outlet for discharging aqueous anode products, and the cathode chamber is provided with a cathode inlet and a cathode outlet for discharging cathode products;
[0008] a first pipeline, one end of which is connected to the anode outlet and the other end of which is connected to the cathode inlet, wherein the first pipeline is provided with a condenser, an expansion device, an evaporator, and a gas-liquid separator in sequence along the flow direction of the aqueous anode product, wherein the gas-liquid separator has a gas outlet and a liquid outlet, and the gas outlet is connected to the cathode inlet through the first pipeline;
[0009] a second pipeline, one end of which is connected to the cathode outlet and the other end of which is connected to the anode inlet; and
[0010] A liquid supply pipeline, one end of which is connected to the liquid outlet of the gas-liquid separator, and the other end of which is connected to the second pipeline.
[0011] In an electrochemical heat pump system according to one aspect of the present application, optionally, the first pipeline is also provided with a heat recovery device, and the heat recovery device includes a first half and a second half, wherein the first half is located at the pipe section between the anode outlet and the condenser, and the second half is located at the pipe section between the cathode inlet and the gas-liquid separator.
[0012] In the electrochemical heat pump system according to one aspect of the present application, optionally, a pump device is provided on the second pipeline, and one end of the liquid supply pipeline is connected to the upstream of the pump device on the second pipeline.
[0013] In the electrochemical heat pump system according to one aspect of the present application, optionally, a one-way valve is provided on the first pipeline and between the gas-liquid separator and the cathode chamber, and a two-way control valve is provided on the liquid supply pipeline and between the gas-liquid separator and the anode chamber.
[0014] In the electrochemical heat pump system according to one aspect of the present application, optionally, the electrochemical heat pump system further includes one or more of a temperature sensor, a pressure sensor, a current sensor, and a voltage sensor and / or an impedance detector for detecting the real-time internal resistance of the battery stack; and / or
[0015] The gas-liquid separator is provided with a liquid level sensor.
[0016] According to another aspect of the present application, there is provided an electrochemical heat pump system, comprising:
[0017] A cell stack comprising an anode chamber, a cathode chamber, and an electrolyte membrane located between the anode chamber and the cathode chamber, wherein the anode chamber is provided with an anode inlet and an anode outlet for discharging aqueous anode products, and the cathode chamber is provided with a cathode inlet and a cathode outlet for discharging cathode products;
[0018] a first pipeline, one end of which is connected to the anode outlet and the other end of which is connected to the cathode inlet, wherein the first pipeline is provided with a condenser, an expansion device, a gas-liquid separator, and an evaporator in sequence along the flow direction of the aqueous anode product, wherein the gas-liquid separator has a gas outlet and a liquid outlet, the gas outlet is connected to the evaporator through the first pipeline, and the liquid outlet is connected to the anode inlet through a liquid supply pipeline;
[0019] a second pipeline, one end of which is connected to the cathode outlet and the other end of which is connected to the anode inlet; and
[0020] A liquid supply pipeline, one end of which is connected to the liquid outlet of the gas-liquid separator, and the other end of which is connected to the second pipeline.
[0021] In an electrochemical heat pump system according to another aspect of the present application, optionally, the first pipeline is also provided with a heat recovery device, and the heat recovery device includes a first half and a second half, wherein the first half is located at the pipe section between the anode outlet and the condenser, and the second half is located at the pipe section between the evaporator and the gas-liquid separator.
[0022] In the electrochemical heat pump system according to another aspect of the present application, optionally, a pump device is provided on the second pipeline, and one end of the liquid supply pipeline is connected to the upstream of the pump device on the second pipeline.
[0023] In an electrochemical heat pump system according to another aspect of the present application, optionally, a one-way valve is provided on the first pipeline and between the gas-liquid separator and the evaporator, and a two-way control valve is provided on the liquid supply pipeline and between the gas-liquid separator and the anode chamber.
[0024] In the electrochemical heat pump system according to another aspect of the present application, optionally, the electrochemical heat pump system further includes one or more of a temperature sensor, a pressure sensor, a current sensor and a voltage sensor and / or an impedance detector for detecting the real-time internal resistance of the battery stack; and / or
[0025] The gas-liquid separator is provided with a liquid level sensor.
[0026] The electrochemical heat pump system provided by the present application recirculates water in the anode chamber of the battery stack by adding a certain amount of deionized water without allowing the water to participate in the chemical reaction of the working fluid, thereby maintaining sufficient hydration of the electrolyte membrane and reducing the ohmic loss caused by water shortage in the electrolyte membrane. At the same time, the addition of water reduces the viscosity of the working fluid solution, increasing the mass transfer rate of the working fluid solution in the battery stack while reducing the power required to pump the reactants. In addition, the electrochemical heat pump system provided by the present application can ensure the safety of system operation and adjust the amount of working fluid and recycled water supplied to the anode according to changes in the liquid level, and further adjust the circulation flow rate of the working fluid and water at the anode based on the real-time internal resistance detection value of the battery stack, thereby realizing real-time monitoring and quantitative control of water and working fluid recycling. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The disclosure of this application will be more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the figures represent similar components, where:
[0028] Figure 1 A schematic diagram of an embodiment of the electrochemical heat pump system disclosed in the present application is exemplarily shown. DETAILED DESCRIPTION
[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application relates. In the event of any inconsistency, the definitions provided herein shall prevail.
[0030] In the present application, unless otherwise explicitly stated, the terms “first” and “second” are only used for the purpose of distinguishing between the two elements and are not intended to indicate their order or relative importance.
[0031] In this application, unless explicitly stated otherwise, the term "connected (or communicated, connected, etc.)" includes connections (or communicated, connected, etc.) achieved directly or indirectly.
[0032] In this application, unless otherwise defined, the numerical ranges listed herein are intended to include the endpoints of the range, and all values and all sub-ranges within that range.
[0033] The terms "comprising", "including" and "having" used herein all indicate that other components or other steps that do not affect the final effect may be included. These terms include the meanings of "consisting of" and "consisting essentially of".
[0034] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, a specific embodiment of a circulation device for an electrochemical heat pump system is described in detail below with reference to the accompanying drawings. It should be understood that all descriptions are exemplary and should not constitute any limitation to the present application.
[0035] exist Figure 1 Schematically shows an embodiment of an electrochemical heat pump system 100 according to the present application, the electrochemical heat pump system includes a battery stack 110, the battery stack 110 includes an anode chamber 112 and a cathode chamber 114, and includes a plurality of battery core units 111. In order to simplify the drawings and the example description, Figure 1Only one battery core unit 111 is schematically shown in the figure. When in use, the battery stack 110 can be formed in a conventional manner by repeatedly stacking multiple battery core units 111 and bipolar plates (not shown). The number of stacks of such units can be adjusted between dozens and hundreds according to demand. The battery core unit 111 can be prepared in a manner similar to that used for membrane electrodes in fuel cells or water electrolysis equipment, and includes an anode catalyst layer and a diffusion layer located in the anode chamber 112, a cathode catalyst layer and a diffusion layer located in the cathode chamber 114, and an electrolyte membrane 113 between the above two. The battery stack 110 may also include an electrolyte membrane 113 not shown in the figure. Figure 1 The collecting plate, insulating plate, end plate and fasteners shown in the figure are assembled to complete the overall assembly.
[0036] exist Figure 1 In the embodiment shown in , the anode of the battery core unit 111 can undergo a dehydrogenation reaction and the cathode can undergo a hydrogenation reaction. For example, the anode catalyst layer may include a dehydrogenation catalyst, such as palladium-carbon (Pd / C) and a proton conductive resin that is the same or similar to the electrolyte membrane 113 material. The cathode catalyst layer may include a hydrogenation catalyst such as ruthenium platinum alloy-carbon (PtRu / C) and a proton conductive resin as described above. Other suitable catalytic materials can be selected for use as anode and cathode catalyst layers, and the ratio of catalytic material to carbon support, resin type and content, catalyst layer thickness, and pore structure can be adjusted as needed to achieve optimal performance of the battery stack. The electrolyte membrane 113 can be selected to have high proton conductivity in the required working fluid environment and temperature range, and has a barrier effect on working fluid penetration and electronic conduction, has good chemical stability and thermal stability and meets the required mechanical strength. It includes but is not limited to perfluorosulfonic acid proton exchange membranes, fluorinated polymer membranes, non-fluorinated polymer membranes, hydrocarbon membranes or composite membranes or porous diaphragms. The battery stack 110 further includes bipolar plates that may be made of, for example, metal or graphite, and the surfaces of which may be provided with grooved flow channels or any other structures that facilitate the guidance and / or discharge of reactants and products.
[0037] exist Figure 1In the embodiment shown in , the anode chamber 112 is provided with an anode inlet and an anode outlet for discharging anode products, and the cathode chamber 114 is provided with a cathode inlet and a cathode outlet for discharging cathode products. As an example, the dehydrogenation reactant in the anode chamber 112 can be isopropanol, and the anode dehydrogenation product, that is, the cathode hydrogenation reactant can be acetone. When in use, a liquid mixture of isopropanol and water is supplied to the anode chamber 112 by the anode inlet, so that liquid isopropanol is dehydrogenated to generate liquid acetone. The voltage of the battery stack 110 can be set as needed so that it remains at a level lower than the voltage required for the electrochemical reaction of water during the operation of the heat pump system. Under such a configuration, water can not participate in the dehydrogenation reaction of the anode and is not consumed, thereby being able to be subsequently recycled in the electrochemical heat pump system 100. In the above example, the operating voltage of the stack 110 can be set to a value lower than the water electrolysis voltage. Furthermore, based on the overall coefficient of performance (COP) of the heat pump, the operating voltage of the stack 110 can be set to the lowest value that meets the stack's operating requirements, thereby achieving lower stack power consumption. The anode product obtained using the above configuration includes unreacted water, liquid acetone, and unreacted isopropyl alcohol.
[0038] exist Figure 1 In the embodiment shown in , the electrochemical heat pump system 100 may include a first pipeline, one end of which is connected to the anode outlet and the other end is connected to the cathode inlet. The first pipeline is provided with a condenser 140, an expansion device 150, an evaporator 160, and a gas-liquid separator 170 in the order of flow of the anode product. In some embodiments, the electrochemical heat pump system 100 may further include a heat recovery device 130, which is configured to have a first half 131 and a second half 132 for heat exchange. The first half 131 may be located in the pipeline section between the anode outlet of the battery stack 110 and the condenser 140, and the second half 132 may be located in the pipeline section between the cathode inlet of the battery stack 110 and the gas-liquid separator 170. The anode product entering the first half 131 may generally have a higher temperature and release heat in the first half 131, while the material entering the second half 132 may generally have a lower temperature and absorb heat in the second half 132. As an example, during use, the anode product containing water, liquid acetone and unreacted isopropyl alcohol flows into the first half 131 of the heat recovery device, and the heat released by the anode product is conducted to the second half 132 of the heat recovery device.
[0039] In such Figure 1In the illustrated electrochemical heat pump system 100, as described above, the anode product can flow from the first half 131 via the first pipeline into the condenser 140, thereby cooling the anode product and releasing heat. For example, during operation, the acetone, water, and isopropyl alcohol passing through the condenser 140 all remain in liquid form and flow into the expansion device 150 connected to the condenser 140. Because the boiling point of acetone (56°C at 101.3 kPa) is lower than that of isopropyl alcohol (83°C at 101.3 kPa), the pressure reduction of the expansion valve 150 causes the acetone to undergo a phase change and convert to a gas, while the isopropyl alcohol and water remain liquids. This phase change produces a gas-liquid mixture of gaseous acetone, liquid isopropyl alcohol, and liquid water, which facilitates subsequent gas-liquid separation.
[0040] exist Figure 1 In the illustrated embodiment, as described above, the gas-liquid mixture that has undergone the aforementioned phase change can flow from the expansion device 150 through the first pipeline into the evaporator 160 to further absorb heat, and then further into the gas-liquid separator 170. The gas-liquid separator 170 can be configured to separate the gas-liquid mixture that has undergone the phase change. For example, during use, the separated gaseous acetone can flow out of the gas outlet of the gas-liquid separator 170, pass through a one-way valve 191 that can be provided on the first pipeline, and flow into the second half 132 of the heat recovery device 130. As described above, there, it absorbs energy to promote the hydrogenation reaction at the cathode before further entering the cathode chamber 114. The separated liquid mixture of isopropyl alcohol and water can flow out of the liquid outlet of the gas-liquid separator 170 and flow to the anode inlet via the liquid supply pipeline. A two-way control valve 192 and a pump device 120 can be provided on the liquid supply pipeline between the gas-liquid separator 170 and the anode chamber 112. When in use, the liquid mixture containing isopropyl alcohol and water is pumped into the anode chamber 112 in a controlled amount by the pump device 120 through the liquid supply pipeline and the two-way control valve 192, thereby completing the recycling of water and isopropyl alcohol.
[0041] In addition, although it is advantageous to provide the first pipeline as described above, in another embodiment, the first pipeline may also be provided with a condenser 140, an expansion device 150, a gas-liquid separator 170, and an evaporator 160 in sequence along the flow direction of the anode product. In some embodiments, the electrochemical heat pump system 100 may further include a heat recovery device 130, the heat recovery device including a first half 131 and a second half 132, the first half 131 being located in the pipe section between the anode outlet and the condenser 140, and the second half 132 being located in the pipe section between the evaporator 160 and the gas-liquid separator 170. As an example, in use, as described above, the anode product containing water, liquid acetone and unreacted isopropyl alcohol can flow from the first half 131 through the first pipeline into the condenser 140 and the expansion device 150 in sequence and then into the gas-liquid separator 170. The separated gaseous acetone flows into the evaporator 160 through the one-way valve 191 to absorb heat, and then flows into the second half 132 of the heat recovery device 130 and further flows into the cathode chamber 114. The liquid supply pipeline can be taken in the same manner as Figure 1 The embodiment shown has the same arrangement as that described in detail above.
[0042] For the two arrangements of the first pipeline described above, the parameters of the evaporator 160 can be configured according to the specific application of the electrochemical heat pump system 100. For example, in some cases, the temperature of the evaporator 160 can be set to the ambient temperature.
[0043] exist Figure 1 In the embodiment shown in , the electrochemical heat pump system 100 may include a second pipeline, one end of which may be connected to the cathode outlet and the other end of which is connected to the anode inlet. The other end of the liquid supply pipeline, except for the end connected to the liquid outlet of the gas-liquid separator 170, may be connected to any position on the second pipeline. The second pipeline may be provided with a pump device 120 shared with the liquid supply pipeline. In this case, the one end of the liquid supply pipeline may be connected to the upstream of the pump device (120) on the second pipeline. As an example, when in use, gaseous acetone may flow from the second half 132 of the heat recovery device 130 into the cathode chamber 114 on the first pipeline, and a hydrogenation reaction may occur in the cathode chamber 114 to generate isopropyl alcohol. The generated isopropyl alcohol may be transported to the anode chamber 112 via the second pipeline by the pump device 120 to perform the next round of reaction as a dehydrogenation reactant.
[0044] In such Figure 1In some of the illustrated embodiments, the gas-liquid separator 170 may be provided with a liquid level sensor 180 to ensure that the amount of liquid accumulated is effectively controlled and to prevent leakage of gaseous acetone in the electrochemical heat pump system 100 according to the present application. The liquid level sensor 180 may be a capacitive liquid level sensor or any other conventional form that is convenient for installation on the gas-liquid separator 170. A controller that communicates with the liquid level sensor 180 may be configured and adjusted as needed to control a two-way control valve 192 to regulate the flow rate of liquid supplied to the anode chamber 112.
[0045] In such Figure 1 In some of the illustrated embodiments, the electrochemical heat pump system 100 may further include one or more of a temperature sensor 211, a pressure sensor 212, a current sensor 221, and a voltage sensor 222. A controller communicating with the above sensors may be configured and adjusted as needed to adjust the electrochemical heat pump system to appropriate operating conditions.
[0046] In some embodiments, the electrochemical heat pump system 100 further includes an impedance detector for detecting the real-time internal resistance of the cell stack 110. Any type of impedance detector that can be easily connected to the cell stack 110 can be selected based on the desired internal resistance range, including but not limited to a high-frequency impedance meter. The measured internal resistance value can be used to determine the amount of water supplied to the anode chamber 112.
[0047] It should be understood that the proton conductivity of the electrolyte membrane 113 depends on the water content inside it. As described above, supplying an appropriate amount of water to the anode chamber 112 can keep it moist and reduce the internal resistance of the battery stack 110. While achieving the above objectives, the amount of added water is controlled to maintain the heat exchange efficiency of the heat pump system according to the present application, thereby enabling an overall reduction in energy consumption. Figure 1 In the embodiment shown in , as an example, the weight ratio of isopropyl alcohol to water can be between 95:5 and 50:50, based on the total weight of the isopropyl alcohol and water mixture supplied to the anode chamber 112. In some embodiments, the weight ratio of isopropyl alcohol to water can advantageously be between 80:20 and 90:10, based on the total weight of the isopropyl alcohol and water mixture.
[0048] For the convenience of explanation, isopropanol and acetone are used as the dehydrogenation reactant and dehydrogenation product, respectively. Figure 1 The embodiment shown is described in detail. However, in other embodiments, other redox species pairs that can undergo phase transition and phase separation within a temperature range compatible with the temperature of the device and have a desired boiling point difference can be selected for the electrochemical dehydrogenation-hydrogenation reaction in the cell stack 110. For the dehydrogenation reaction occurring in the anode chamber 112, the dehydrogenation reactant and dehydrogenation product can be selected from isopropyl alcohol and acetone, methanol and formaldehyde, ethanol and acetaldehyde, butanol and butanone.
[0049] Compared to the prior art, the electrochemical heat pump system 100 described above significantly reduces the energy consumption of such heat pump systems by using the cell stack 110 to power the heat pump system. It utilizes water recycling to maintain sufficient hydration of the electrolyte membrane 113 in the anode chamber 112 of the cell stack 110, reducing the ohmic loss of the cell stack 110, and reducing the mass transfer loss in the electrochemical process and the pump power requirements required by the system by reducing the viscosity of the dehydrogenation reactant solution. It is expected that the electrochemical heat pump system using the recycling system according to the embodiment of the present application can achieve a significant COP improvement relative to conventional heat pump equipment using a compressor.
[0050] Several specific implementations have been listed above to illustrate the present application in detail. These examples are intended solely to illustrate the principles and implementation methods of the present application and are not intended to limit the present application. Persons skilled in the art may make various modifications and improvements without departing from the spirit and scope of the present application. Therefore, all equivalent technical solutions are intended to fall within the scope of the present application and be defined by the claims of the present application.
Claims
1. An electrochemical heat pump system, characterized in that: It includes: A cell stack (110) comprising an anode chamber (112), a cathode chamber (114), and an electrolyte membrane (113) located between the anode chamber (112) and the cathode chamber, wherein the anode chamber (112) is provided with an anode inlet and an anode outlet for discharging aqueous anode products, and the cathode chamber (114) is provided with a cathode inlet and a cathode outlet for discharging cathode products; a first pipeline, one end of which is connected to the anode outlet and the other end of which is connected to the cathode inlet, wherein the first pipeline is provided with a condenser (140), an expansion device (150), an evaporator (160) and a gas-liquid separator (170) in sequence along the flow direction of the aqueous anode product, wherein the gas-liquid separator (170) has a gas outlet and a liquid outlet, and the gas outlet is connected to the cathode inlet through the first pipeline; a second pipeline, one end of which is connected to the cathode outlet and the other end of which is connected to the anode inlet; and A liquid supply pipeline, one end of which is connected to the liquid outlet of the gas-liquid separator (170), and the other end of which is connected to the second pipeline.
2. The electrochemical heat pump system according to claim 1, characterized in that: The first pipeline is also provided with a heat recovery device (130), which includes a first half (131) and a second half (132), wherein the first half (131) is located at the pipe section between the anode outlet and the condenser (140), and the second half (132) is located at the pipe section between the cathode inlet and the gas-liquid separator (170).
3. The electrochemical heat pump system according to claim 1, characterized in that: A pump device (120) is provided on the second pipeline, and one end of the liquid supply pipeline is connected to the upstream of the pump device (120) on the second pipeline.
4. The electrochemical heat pump system according to claim 1, characterized in that: A one-way valve (191) is provided on the first pipeline between the gas-liquid separator (170) and the cathode chamber (114), and a two-way control valve (192) is provided on the liquid supply pipeline between the gas-liquid separator (170) and the anode chamber (112).
5. The electrochemical heat pump system according to claim 1, characterized in that: The electrochemical heat pump system further includes one or more of a temperature sensor (211), a pressure sensor (212), a current sensor (221), and a voltage sensor (222) and / or an impedance detector for detecting the real-time internal resistance of the battery stack (110); and / or The gas-liquid separator (170) is provided with a liquid level sensor (180).
6. An electrochemical heat pump system, characterized in that: It includes: A cell stack (110) comprising an anode chamber (112), a cathode chamber (114), and an electrolyte membrane (113) located between the anode chamber (112) and the cathode chamber, wherein the anode chamber (112) is provided with an anode inlet and an anode outlet for discharging aqueous anode products, and the cathode chamber (114) is provided with a cathode inlet and a cathode outlet for discharging cathode products; a first pipeline, one end of which is connected to the anode outlet and the other end of which is connected to the cathode inlet; the first pipeline is provided with a condenser (140), an expansion device (150), a gas-liquid separator (170), and an evaporator (160) in sequence along the flow direction of the aqueous anode product; wherein the gas-liquid separator (170) has a gas outlet and a liquid outlet, and the gas outlet is connected to the evaporator (160) through the first pipeline; a second pipeline, one end of which is connected to the cathode outlet and the other end of which is connected to the anode inlet; and A liquid supply pipeline, one end of which is connected to the liquid outlet of the gas-liquid separator (170), and the other end of which is connected to the second pipeline.
7. The electrochemical heat pump system according to claim 6, characterized in that: The first pipeline is also provided with a heat recovery device (130), which includes a first half (131) and a second half (132), wherein the first half (131) is located at the pipe section between the anode outlet and the condenser (140), and the second half (132) is located at the pipe section between the evaporator (160) and the gas-liquid separator (170).
8. The electrochemical heat pump system according to claim 6, characterized in that: A pump device (120) is provided on the second pipeline, and one end of the liquid supply pipeline is connected to the second pipeline upstream of the pump device (120) on the second pipeline.
9. The electrochemical heat pump system according to claim 6, characterized in that: A one-way valve (191) is provided on the first pipeline between the gas-liquid separator (170) and the evaporator (160), and a two-way control valve (192) is provided on the liquid supply pipeline between the gas-liquid separator (170) and the anode chamber (112).
10. The electrochemical heat pump system according to claim 6, characterized in that: The electrochemical heat pump system further includes one or more of a temperature sensor (211), a pressure sensor (212), a current sensor (221), and a voltage sensor (222) and / or an impedance detector for detecting the real-time internal resistance of the battery stack (110); and / or The gas-liquid separator (170) is provided with a liquid level sensor (180).