Cathode gas supply system

Abstract

The invention discloses a cathode gas supply system, which is applied to a fuel cell, and comprises an air compression device, which comprises a compressed air outlet communicated with an electric pile of the fuel cell through an input gas pipeline; the cooler is arranged on the gas input pipeline and used for cooling the compressed air output by the compressed air outlet to the working temperature; the first gas-liquid heat exchanger is arranged on the gas input pipeline between the air compression device and the cooler; the gas recovery device is communicated with the electric pile through a gas output pipeline; a second gas-liquid heat exchanger is arranged on the output gas pipeline; and the circulating pump is used for driving the heat exchange medium to flow between the first gas-liquid heat exchanger and the second gas-liquid heat exchanger. Energy exchange is carried out between the compressed air and the to-be-recycled gas, so that the temperature of the compressed air is reduced, the temperature of the to-be-recycled gas is increased, and the beneficial effects that the energy consumption of the cooler is reduced, and recoverable energy in the to-be-recycled gas is increased are achieved.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a cathode gas supply system. Background Art

[0002] In the existing technology, the fuel cell uses an intercooler to dissipate heat for the cathode air supply system, which means that the air is compressed by the air compressor to form high-temperature gas, and the intercooler is used to realize heat exchange between the coolant of the thermal management system and the high-temperature air to reduce the high-temperature gas to the operating temperature, and the heat transfer between the environment is completed through the cooling water pump and fan assembly and other energy-consuming parts in the thermal management system; on the other hand, the tail exhaust mixed gas with a certain amount of energy is recovered through the turbine recovery device to realize the recovery of the tail exhaust mixed gas energy, and the current cathode air supply system still has the potential for further improvement in the tail exhaust energy recovery efficiency and the energy consumption of the intercooler cooling process. Summary of the Invention

[0003] The embodiments of the present application provide a cathode gas supply system to at least solve the problem in the prior art that energy consumption and energy recovery of cathode gas supply systems need to be further optimized. The technical solutions disclosed in the present application are as follows:

[0004] According to a first aspect of an embodiment of the present application, a cathode gas supply system is provided, which is applied to a fuel cell, comprising:

[0005] An air compression device, comprising a compressed air outlet, wherein the compressed air outlet is connected to the fuel cell stack via an input gas pipeline;

[0006] a cooler, disposed on the input gas pipeline, for cooling the compressed air outputted from the compressed air outlet to a working temperature; the working temperature represents the temperature of the compressed air when inputted into the fuel cell stack; the compressed air temperature is greater than the working temperature;

[0007] a first gas-liquid heat exchanger, disposed on the input gas pipeline between the air compression device and the cooler;

[0008] A gas recovery device is connected to the fuel cell stack through an output gas pipeline; a second gas-liquid heat exchanger is provided on the output gas pipeline;

[0009] A circulation pump is used to drive the heat exchange medium to flow between the first gas-liquid heat exchanger and the second gas-liquid heat exchanger; wherein the heat exchange medium output port of the circulation pump is connected to the heat exchange medium input port of the second gas-liquid heat exchanger; the heat exchange medium output port of the second gas-liquid heat exchanger is connected to the heat exchange medium input port of the first gas-liquid heat exchanger; and the heat exchange medium output port of the first gas-liquid heat exchanger is connected to the heat exchange medium input port of the circulation pump.

[0010] In an exemplary embodiment, the cathode gas supply system further comprises:

[0011] A first sensor is provided on the input gas pipeline and close to the fuel cell stack, and is used to measure the operating temperature and / or operating pressure of the compressed air input to the fuel cell stack;

[0012] The second sensor is arranged on the output gas pipeline and close to the fuel cell stack, and is used to measure the temperature to be recovered and / or the pressure to be recovered of the gas to be recovered output from the fuel cell stack.

[0013] In an exemplary embodiment, the cathode gas supply system further comprises:

[0014] a fourth sensor, disposed on the input gas pipeline and close to the first gas-liquid heat exchanger, for measuring the post-compression temperature of the compressed air at the first gas-liquid heat exchanger;

[0015] A fifth sensor is provided on the output gas pipeline and close to the second gas-liquid heat exchanger, and is used to measure the temperature of the gas to be recovered at the second gas-liquid heat exchanger.

[0016] In an exemplary embodiment, the power output end of the gas recovery device is connected to the power input end of the air compression device; the gas recovery device is used to provide power to the air compression device through gas transmission.

[0017] In an exemplary embodiment, the fuel cell further comprises: a thermal management system for dissipating heat from the fuel cell stack; characterized in that the heat exchange medium input port of the cooler is connected to the heat exchange medium output port of the thermal management system;

[0018] The heat exchange medium output port of the cooler is communicated with the heat exchange medium input port of the thermal management system.

[0019] In an exemplary embodiment, the cathode gas supply system further comprises:

[0020] A humidifying device is provided on the input gas pipeline and located between the cooler and the fuel cell stack, and is used to adjust the humidity of the compressed air.

[0021] In an exemplary embodiment, the cathode gas supply system further comprises:

[0022] An air filter device, used to filter impurities in ambient air to obtain filtered air;

[0023] The filtered air output port of the air filter device is communicated with the pre-compressed air input port of the air compressor device through an air pipeline.

[0024] In an exemplary embodiment, the cathode gas supply system further comprises:

[0025] A third sensor is provided in the cathode gas supply system and is used to measure the ambient temperature and / or ambient pressure of the ambient air.

[0026] In an exemplary embodiment, a gas flow meter is provided on the air pipeline for measuring the gas flow in the air pipeline.

[0027] According to a second aspect of an embodiment of the present disclosure, a fuel cell is provided, characterized in that the fuel cell includes a cathode gas supply system as described in the first aspect above.

[0028] A cathode gas supply system according to an embodiment of the present application is applied to a fuel cell, and the cathode gas supply system includes: an air compression device, including a compressed air outlet, which is connected to the fuel cell stack through an input gas pipeline; a cooler, arranged on the input gas pipeline, for cooling the compressed air output from the compressed air outlet to the working temperature; the working temperature represents the temperature of the compressed air when it is input into the fuel cell stack; the compressed temperature is greater than the working temperature; a first gas-liquid heat exchanger, arranged on the input gas pipeline between the air compression device and the cooler; a gas recovery device, which is connected to the fuel cell stack through an output gas pipeline; a second gas-liquid heat exchanger is arranged on the output gas pipeline; a circulating pump, which is used to drive the heat exchange medium to flow between the first gas-liquid heat exchanger and the second gas-liquid heat exchanger; wherein the heat exchange medium output port of the circulating pump is connected to the heat exchange medium input port of the second gas-liquid heat exchanger; the heat exchange medium output port of the second gas-liquid heat exchanger is connected to the heat exchange medium input port of the first gas-liquid heat exchanger; and the heat exchange medium output port of the first gas-liquid heat exchanger is connected to the heat exchange medium input port of the circulating pump. The present application reduces the temperature of the compressed air and increases the temperature of the gas to be recovered by exchanging energy between the compressed air and the gas to be recovered, thereby achieving the beneficial effects of reducing the energy consumption of the cooler and increasing the recoverable energy in the gas to be recovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 This is a schematic structural diagram of a fuel cell provided in an embodiment of the present application.

[0031] The following is a supplementary description of the accompanying drawings:

[0032] 1- cathode gas supply system; 11- air compression device; 110- compressed air outlet; 111- power input terminal; 112- pre-compression air input port; 12- input gas pipeline; 13- cooler; 131- heat exchange medium input port of the cooler; 132- heat exchange medium output port of the cooler; 14- first gas-liquid heat exchanger; 141- heat exchange medium input port of the first gas-liquid heat exchanger; 142- heat exchange medium output port of the first gas-liquid heat exchanger; 15- gas recovery device; 151- power output terminal; 152- variable section turbocharger regulating valve; 16- output gas pipeline; 17- second gas-liquid heat exchanger; 171- heat exchange of the second gas-liquid heat exchanger Medium input port; 172-heat exchange medium output port of the second gas-liquid heat exchanger; 18-circulating pump; 181-heat exchange medium output port of the circulating pump; 182-heat exchange medium input port of the circulating pump; 19-first sensor; 120-second sensor; 121-humidification device; 122-air filter device; 123-filtered air output port; 124-air pipeline; 125-third sensor; 126-gas flow meter; 127-motor; 128-three-way valve; 129-two-way valve; 2-fuel cell stack; 3-thermal management system; 31-heat exchange medium output port of the thermal management system; 32-heat exchange medium input port of the thermal management system; 4-hydrogen supply system. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of this application.

[0034] References to "one embodiment" or "embodiment" herein refer to specific features, structures, or characteristics that may be included in at least one implementation of the present application. Throughout the description of this application, it should be understood that the terms "upper," "lower," "top," and "bottom," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and are therefore not to be construed as limiting the present application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, the terms "first," "second," etc. are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that such terms are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0035] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein. For example, a specified range from "1 to 10" should be considered to include any and all subranges between a minimum of 1 and a maximum of 10. Exemplary subranges of the range 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0036] The present application relates to the field of hydrogen fuel cell technology. Hydrogen fuel cells are a key technology for new energy. Their basic principle is that hydrogen and oxygen undergo an electrochemical reaction under the action of a proton exchange membrane and related catalysts. The reaction process generates electricity and heat, and a residual clean exhaust gas is discharged. The generated electricity can be used as a power source for electrical components and for energy storage. The generated heat can be used for waste heat utilization or directly discharged to the atmosphere. The mixed exhaust gas discharged during the process can be used for energy recovery through a turbine. Because hydrogen fuel cells do not produce harmful substances during the electrochemical reaction of hydrogen and oxygen, they are recognized as one of the most promising clean technologies in the new energy field. In the automotive field, hydrogen fuel cells generally operate at a power level of between tens of kilowatts and hundreds of kilowatts. In addition to generating electricity during operation, hydrogen fuel cells also produce approximately 50% of their energy in the form of heat, as well as a large amount of exhaust mixed gas at a certain pressure that carries some heat and water. In existing technical solutions, on the one hand, the heat dissipation of the electrochemical reaction heat of the fuel cell stack is completed through the thermal management system, and the heat dissipation of the cathode gas supply system is completed through the intercooler. Among them, the so-called heat dissipation of the cathode gas supply system through the intercooler refers to the air being compressed by the air compressor to form high-temperature gas. The intercooler is used to realize the heat exchange between the coolant of the thermal management system and the high-temperature air to reduce the high-temperature gas to the operating temperature, and finally the heat transfer between the coolant and the environment is completed through the energy-consuming parts such as the cooling water pump and fan assembly in the thermal management system; on the other hand, the tail exhaust mixed gas with a certain amount of energy is recovered through the turbine recovery device to realize the energy recovery of the tail exhaust mixed gas. In fuel cell systems, the above two technical solutions mostly exist at the same time. Among them, reducing the energy consumption of the energy-consuming parts in the thermal management system or increasing the recoverable energy in the tail exhaust mixed gas each has the same beneficial effect of improving the efficiency of the entire fuel cell system. In response to the problem that energy consumption and energy recovery of cathode gas supply systems in the prior art need to be further optimized, the embodiments of the present application provide a cathode gas supply system that exchanges energy between compressed air and the gas to be recovered, thereby reducing the temperature of the compressed air and increasing the temperature of the gas to be recovered, thereby achieving the beneficial effects of reducing the energy consumption of the cooler and increasing the recoverable energy in the gas to be recovered, thereby improving the efficiency of the system.

[0037] The following describes a specific embodiment of a cathode gas supply system provided by the present application, which is applied to a fuel cell. Figure 1 , which is a schematic structural diagram of a fuel cell provided in an embodiment of the present application.

[0038] The application embodiment provides a cathode gas supply system 1 applied to a fuel cell, comprising: an air compression device 11 including a compressed air outlet 110 , wherein the compressed air outlet 110 is connected to the fuel cell stack 2 via an input gas pipeline 12 .

[0039] Specifically, the material, length and diameter of the input gas pipeline 12 can be set according to actual needs, and the embodiment of the present application does not make specific requirements.

[0040] The cooler 13 is provided on the input gas pipeline 12 and is used to cool the compressed air output from the compressed air outlet 110 to the operating temperature; the operating temperature represents the temperature of the compressed air when it is input into the fuel cell stack 2; the compressed temperature is greater than the operating temperature.

[0041] Specifically, the cooler 13 may be an intercooler or other cooling equipment, and the embodiment of the present application does not specifically limit the model and quantity of the cooler 13.

[0042] The first gas-liquid heat exchanger 14 is disposed on the input gas pipeline 12 between the air compressing device 11 and the cooler 13 .

[0043] In a specific implementation, the number and type of the first gas-liquid heat exchangers 14 and their specific locations on the input gas pipeline 12 between the air compression device 11 and the cooler 13 can be set according to actual needs.

[0044] The gas recovery device 15 is connected to the fuel cell stack 2 via the output gas pipeline 16 ; a second gas-liquid heat exchanger 17 is provided on the output gas pipeline 16 .

[0045] In a specific implementation, the number and type of the second gas-liquid heat exchangers 17 and their specific locations on the output gas pipeline 16 can be set according to actual needs.

[0046] The circulation pump 18 is used to drive the heat exchange medium to flow between the first gas-liquid heat exchanger 14 and the second gas-liquid heat exchanger 17; wherein the heat exchange medium output port 181 of the circulation pump 18 is connected to the heat exchange medium input port 171 of the second gas-liquid heat exchanger 17; the heat exchange medium output port 172 of the second gas-liquid heat exchanger 17 is connected to the heat exchange medium input port 141 of the first gas-liquid heat exchanger 14; and the heat exchange medium output port 142 of the first gas-liquid heat exchanger 14 is connected to the heat exchange medium input port 182 of the circulation pump 18.

[0047] In a specific implementation, the model and size of the circulation pump 18 can be set according to actual needs.

[0048] In an embodiment of the present application, the cathode gas supply system 1 also includes: a first sensor 19, which is arranged on the input gas pipeline 12 and is arranged close to the fuel cell stack 2, and is used to measure the working temperature and, or the working pressure, of the compressed air input to the fuel cell stack 2; a second sensor 120, which is arranged on the output gas pipeline 16 and is arranged close to the fuel cell stack 2, and is used to measure the recovered temperature and, or the recovered pressure, of the recovered gas output from the fuel cell stack 2.

[0049] Specifically, the cathode gas supply system 1 further includes the first sensor 19, which is provided on the input gas pipeline 12 and is located near the fuel cell stack 2, and is used to measure the working temperature and, or working pressure, of the compressed air input to the fuel cell stack 2. The second sensor 120 is provided on the output gas pipeline 16 and is located near the fuel cell stack 2, and is used to measure the temperature and, or pressure of the recovered gas output from the fuel cell stack 2. For example, please refer to Figure 1 As shown, a first sensor 19 is provided on the input gas pipeline 12 and near the fuel cell stack 2 for measuring the working temperature and, or working pressure, of the compressed air input to the fuel cell stack 2; a second sensor 120 is provided on the output gas pipeline 16 and near the fuel cell stack 2 to measure the recovered temperature and, or the recovered pressure, of the gas to be recovered output from the fuel cell stack 2. By providing the first sensor 19 and the second sensor 120, the cathode gas supply system 1 can monitor the working temperature and, or working pressure, of the compressed air and the recovered temperature and, or the recovered pressure, of the gas to be recovered, thereby ensuring the stability of the operation of the cathode gas supply system 1.

[0050] In an embodiment of the present application, the cathode gas supply system 1 also includes a fourth sensor, which is arranged on the input gas pipeline 12 and is close to the first gas-liquid heat exchanger 14, and is used to measure the compressed temperature of the compressed air at the first gas-liquid heat exchanger 14; a fifth sensor, which is arranged on the output gas pipeline 16 and is close to the second gas-liquid heat exchanger 17, and is used to measure the recovered temperature of the gas to be recovered at the second gas-liquid heat exchanger 17.

[0051] Specifically, the models and measurement accuracy of the fourth and fifth sensors can be set according to actual needs. The cathode gas supply system 1 also includes a fourth sensor, which is provided on the input gas pipeline 12 and is located near the first gas-liquid heat exchanger 14, for measuring the post-compression temperature of the compressed air at the first gas-liquid heat exchanger 14; and a fifth sensor, which is provided on the output gas pipeline 16 and is located near the second gas-liquid heat exchanger 17, for measuring the to-be-recovered temperature of the to-be-recovered gas at the second gas-liquid heat exchanger 17. Exemplarily, the fourth sensor is provided on the input gas pipeline 12 and is located near the first gas-liquid heat exchanger 14, for measuring the post-compression temperature of the compressed air at the first gas-liquid heat exchanger 14; and the fifth sensor is provided on the output gas pipeline 16 and is located near the second gas-liquid heat exchanger 17, for measuring the to-be-recovered temperature of the to-be-recovered gas at the second gas-liquid heat exchanger 17. The controller of the cathode gas supply system 1 analyzes the post-compression temperature and the to-be-recovered temperature and starts the circulation pump 18 when the post-compression temperature is greater than the to-be-recovered temperature, thereby avoiding energy waste.

[0052] In the embodiment of the present application, the power output end 151 of the gas recovery device 15 is connected to the power input end 111 of the air compression device 11; the gas recovery device 15 is used to provide power to the air compression device 11 through gas transmission.

[0053] Specifically, the gas recovery device 15 may include a turbine, and the air compression device 11 may be a compressor. For example, please refer to Figure 1 As shown, the power output end 151 of the turbine 15 is connected to the power input end 111 of the compressor 11. By arranging the turbine 15 to provide power to the compressor 11 through gas transmission, energy circulation is achieved and energy utilization efficiency is improved.

[0054] In an embodiment of the present application, the fuel cell also includes: a thermal management system 3 for dissipating heat to the fuel cell stack 2; the heat exchange medium input port 131 of the cooler is connected to the heat exchange medium output port 31 of the thermal management system 3; the heat exchange medium output port 132 of the cooler 13 is connected to the heat exchange medium input port 32 of the thermal management system 3.

[0055] Specifically, the heat management system 3 can be used to exchange heat with the compressed gas by means of the cooler 13. For example, please refer to Figure 1 As shown, the fuel cell also includes: a thermal management system 3 for dissipating heat from the fuel cell stack 2, and the cooler 13 is an intercooler 13, wherein the heat exchange medium input port 131 of the intercooler 13 is connected to the heat exchange medium output port 31 of the thermal management system 3, and the heat exchange medium output port 132 of the intercooler 13 is connected to the heat exchange medium input port 32 of the thermal management system 3. The heat exchange medium can be a coolant, and the thermal management system 3 can exchange heat with the compressed gas through the intercooler 13, thereby cooling the compressed gas.

[0056] In the embodiment of the present application, the cathode gas supply system 1 further includes: a humidifying device 121, which is arranged on the input gas pipeline 12 and located between the cooler 13 and the fuel cell stack 2, and is used to adjust the humidity of the compressed air.

[0057] Specifically, the model, size and quantity of the humidifying device 121 can be set according to actual needs. The humidifying device 121 can be a humidifier, for example, please refer to Figure 1 As shown, a humidifier is provided on the input gas pipeline 12, and the humidifier 19 is located between the cooler 13 and the fuel cell stack 2. By providing the humidifier 19, the humidity of the compressed air can be adjusted to meet the humidity requirement of the fuel cell stack for the compressed air.

[0058] In an embodiment of the present application, the cathode gas supply system 1 also includes: the air filter device 122, which is used to filter impurities in the ambient air to obtain filtered air; the filtered air output port 123 of the air filter device 122 is connected to the pre-compression air input port 112 of the air compression device 11 through an air pipeline 124.

[0059] Specifically, the model, size and quantity of the air filter device 122 can be set according to actual needs. For example, please refer to Figure 1 As shown, the filtered air output port 123 of the air filter device 122 is connected to the pre-compression air input port 112 of the air compressor 11 through an air pipeline 124. By filtering the air before compression, the purpose of filtering impurities in the ambient air is achieved, thereby reducing the loss to the fuel cell.

[0060] In the embodiment of the present application, the cathode gas supply system 1 further includes: a third sensor 125, which is arranged in the cathode gas supply system 1 and is used to measure the ambient temperature and / or ambient pressure of the ambient air.

[0061] Specifically, the model, size and quantity of the third sensor 125 can be set according to actual needs. For example, please refer to Figure 1 As shown, a third sensor 125 is provided in the cathode gas supply system 1. By providing the third sensor 125 for measuring the ambient temperature and / or ambient pressure of the ambient air, the fuel cell system can dynamically adapt to changes in external conditions, optimize performance, improve energy efficiency, prevent failures, and extend service life. This is a key feedback link for achieving reliable and efficient operation.

[0062] In the embodiment of the present application, a gas flow meter 126 is provided on the air pipeline 124 for measuring the gas flow in the air pipeline 124 .

[0063] Specifically, the model, size, quantity and specific position of the gas flow meter 126 on the air pipe 124 can be set according to actual needs. For example, please refer to Figure 1 As shown, a gas flow meter 126 is provided on the air pipeline 124 to measure the gas flow in the air pipeline 124 to ensure that the oxygen supply matches the reaction demand and optimize the efficiency of the fuel cell stack 2.

[0064] In an embodiment of the present application, a fuel cell is provided, comprising any cathode gas supply system as described above.

[0065] The present invention has no special requirements for the preparation of the battery, and conventional fuel cell preparation methods in the art can be used. The specific preparation process is well known in the field of fuel cells and will not be described in detail here.

[0066] In order to facilitate understanding of the technical solutions of the embodiments of the present application, Figure 1 The embodiments of the present application describe a cathode gas supply system for a fuel cell.

[0067] The fuel cell comprises: a thermal management system 3 for dissipating heat for the fuel cell stack 2 , a hydrogen supply system 4 for supplying hydrogen to the fuel cell stack 2 , and a cathode supply system 1 for supplying air to the fuel cell stack 2 .

[0068] Wherein, the cathode gas supply system comprises:

[0069] The air compression device 11 includes a compressed air outlet 110, which is connected to the fuel cell stack 2 via an input gas pipeline 12. A cooler 13 is provided on the input gas pipeline 12 and is used to cool the compressed air output from the compressed air outlet 110 to an operating temperature. The cooler 13 is an intercooler 13, wherein a heat exchange medium input port 131 of the intercooler 13 is connected to a heat exchange medium output port 31 of the thermal management system 3, and a heat exchange medium output port 132 of the intercooler 13 is connected to a heat exchange medium input port 32 of the thermal management system 3. The power output end 151 of the gas recovery device 15 is connected to the power input end 111 of the air compression device 11; the gas recovery device 15 is used to provide power to the air compression device 11 through gas transmission, and the gas recovery device 15 includes a turbine and is provided with a variable-section turbocharger regulating valve 152; a motor 127 is also provided between the gas recovery device 15 and the air compression device 11, and the motor 127 is mainly used to drive the air compression device 11 to work.

[0070] The first gas-liquid heat exchanger 14 is provided on the input gas pipeline 12 between the air compression device 11 and the cooler 13. The gas recovery device 15 is connected to the fuel cell stack 2 via the output gas pipeline 16; the output gas pipeline 16 is provided with a second gas-liquid heat exchanger 17.

[0071] The circulation pump 18 is used to drive the heat exchange medium to flow between the first gas-liquid heat exchanger 14 and the second gas-liquid heat exchanger 17; wherein the heat exchange medium output port 181 of the circulation pump 18 is connected to the heat exchange medium input port 171 of the second gas-liquid heat exchanger 17; the heat exchange medium output port 172 of the second gas-liquid heat exchanger 17 is connected to the heat exchange medium input port 141 of the first gas-liquid heat exchanger 14; and the heat exchange medium output port 142 of the first gas-liquid heat exchanger 14 is connected to the heat exchange medium input port 182 of the circulation pump 18. The first sensor 19 is provided on the input gas pipeline 12 and is provided near the fuel cell stack 2. It is used to measure the working temperature and, or, the working pressure, of the compressed air input to the fuel cell stack 2. The second sensor 120 is provided on the output gas pipeline 16 and is provided near the fuel cell stack 2. It is used to measure the temperature and, or, the pressure, of the gas to be recovered output from the fuel cell stack 2.

[0072] The humidifying device 121 is arranged on the input gas pipeline 12 and is located between the cooler 13 and the fuel cell stack 2. It is used to adjust the humidity of the compressed air. The humidifying device 121 is also arranged on the output gas pipeline 16. A three-way valve 128 is also provided on the input gas pipeline 12 between the humidifying device 121 and the fuel cell stack 2, and a two-way valve 129 is provided on the output gas pipeline 16 between the humidifying device 121 and the fuel cell stack 2.

[0073] The air filter device 122 is used to filter impurities in the ambient air to obtain filtered air; the filtered air output port 123 of the air filter device 122 is connected to the pre-compression air input port 112 of the air compressor 11 through an air pipeline 124.

[0074] The third sensor 125 is provided in the cathode gas supply system 1 and is used to measure the ambient temperature and / or ambient pressure of the ambient air.

[0075] A gas flow meter 126 is provided on the air pipeline 124 for measuring the gas flow in the air pipeline 124 .

[0076] In addition, the embodiment of the present application also provides a control method based on the cathode gas supply system, which includes: the compressed air temperature T1 at the first gas-liquid heat exchanger 14 can be calculated based on the working parameters of the air compression device 11 (the air temperature T0 when entering the air compression device 11, π = the outlet pressure of the air compression device 11 / the inlet pressure of the air compression device 11) and the gas specific heat capacity ratio k (about 1.4 for air), and the calculation formula is: T1 = T0 × [1 + 1 / η × (π (K-1) / K -1)]; the temperature measured by the second sensor 120 is used as the temperature T2 of the gas to be recovered at the second gas-liquid heat exchanger 17, wherein the adiabatic efficiency η.

[0077] When the temperature T1 of the compressed air at the first gas-liquid heat exchanger 14 is greater than the temperature T2 of the gas to be recovered at the second gas-liquid heat exchanger 17 (for example, T1-T2≥5°C), the circulation pump 18 is turned on to exchange energy between the compressed air and the gas to be recovered, thereby reducing the temperature of the compressed air and increasing the temperature of the gas to be recovered, thereby achieving the beneficial effect of reducing the energy consumption of the cooler and increasing the recoverable energy in the gas to be recovered.

[0078] An embodiment of the present application discloses a cathode gas supply system for use in a fuel cell, the cathode gas supply system comprising: an air compression device comprising a compressed air outlet, the compressed air outlet being connected to a fuel cell stack via an input gas pipeline; a cooler, arranged on the input gas pipeline, for cooling the compressed air outputted from the compressed air outlet to a working temperature, wherein the working temperature represents the temperature of the compressed air when the compressed air is inputted into the fuel cell stack, and the compressed temperature is greater than the working temperature; a first gas-liquid heat exchanger, arranged on the input gas pipeline between the air compression device and the cooler; a gas recovery device, connected to the fuel cell stack via an output gas pipeline; a second gas-liquid heat exchanger being arranged on the output gas pipeline; a circulating pump, for driving a heat exchange medium to flow between the first gas-liquid heat exchanger and the second gas-liquid heat exchanger; wherein the heat exchange medium output port of the circulating pump is connected to the heat exchange medium input port of the second gas-liquid heat exchanger; the heat exchange medium output port of the second gas-liquid heat exchanger is connected to the heat exchange medium input port of the first gas-liquid heat exchanger; and the heat exchange medium output port of the first gas-liquid heat exchanger is connected to the heat exchange medium input port of the circulating pump. The present application reduces the temperature of the compressed air by exchanging energy between the compressed air and the gas to be recovered, thereby achieving the beneficial effects of reducing the energy consumption of the cooler and increasing the recoverable energy in the gas to be recovered.

[0079] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A cathode gas supply system, applied to a fuel cell, characterized in that: include: An air compression device, comprising a compressed air outlet, wherein the compressed air outlet is connected to the fuel cell stack via an input gas pipeline; a cooler, provided on the input gas pipeline, for cooling the compressed air outputted from the compressed air outlet to a working temperature after compression; The operating temperature represents the temperature of the compressed air when it is input into the fuel cell stack; the compressed air temperature is greater than the operating temperature; a first gas-liquid heat exchanger, disposed on the input gas pipeline between the air compression device and the cooler; A gas recovery device is connected to the fuel cell stack through an output gas pipeline; a second gas-liquid heat exchanger is provided on the output gas pipeline; A circulation pump is used to drive the heat exchange medium to flow between the first gas-liquid heat exchanger and the second gas-liquid heat exchanger; wherein the heat exchange medium output port of the circulation pump is connected to the heat exchange medium input port of the second gas-liquid heat exchanger; the heat exchange medium output port of the second gas-liquid heat exchanger is connected to the heat exchange medium input port of the first gas-liquid heat exchanger; and the heat exchange medium output port of the first gas-liquid heat exchanger is connected to the heat exchange medium input port of the circulation pump.

2. A cathode gas supply system according to claim 1, characterized in that: The cathode gas supply system further comprises: A first sensor is provided on the input gas pipeline and close to the fuel cell stack, and is used to measure the operating temperature and / or operating pressure of the compressed air input to the fuel cell stack; The second sensor is arranged on the output gas pipeline and close to the fuel cell stack, and is used to measure the temperature to be recovered and / or the pressure to be recovered of the gas to be recovered output from the fuel cell stack.

3. The cathode gas supply system according to claim 1, characterized in that: The cathode gas supply system further comprises: a fourth sensor, disposed on the input gas pipeline and close to the first gas-liquid heat exchanger, for measuring the post-compression temperature of the compressed air at the first gas-liquid heat exchanger; A fifth sensor is provided on the output gas pipeline and close to the second gas-liquid heat exchanger, and is used to measure the temperature of the gas to be recovered at the second gas-liquid heat exchanger.

4. The cathode gas supply system according to claim 1, characterized in that: The power output end of the gas recovery device is connected to the power input end of the air compression device; the gas recovery device is used to provide power to the air compression device through gas transmission.

5. The cathode gas supply system according to claim 1, wherein the fuel cell further comprises: A thermal management system for dissipating heat from the stack; characterized in that the heat exchange medium input port of the cooler is connected to the heat exchange medium output port of the thermal management system; The heat exchange medium output port of the cooler is communicated with the heat exchange medium input port of the thermal management system.

6. The cathode gas supply system according to claim 1, characterized in that: The cathode gas supply system further comprises: A humidifying device is provided on the input gas pipeline and located between the cooler and the fuel cell stack, and is used to adjust the humidity of the compressed air.

7. The cathode gas supply system according to claim 1, characterized in that: The cathode gas supply system further comprises: An air filter device, used to filter impurities in ambient air to obtain filtered air; The filtered air output port of the air filter device is communicated with the pre-compressed air input port of the air compressor device through an air pipeline.

8. The cathode gas supply system according to claim 7, characterized in that: The cathode gas supply system further comprises: A third sensor is provided in the cathode gas supply system and is used to measure the ambient temperature and / or ambient pressure of the ambient air.

9. The cathode gas supply system according to claim 7, characterized in that: A gas flow meter is provided on the air pipeline for measuring the gas flow in the air pipeline.

10. A fuel cell, characterized in that: The fuel cell comprises a cathode gas supply system as described in any one of claims 1-9.

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