Battery humidity control system

Abstract

The embodiment of the utility model provides a battery humidity control system, and belongs to the technical field of fuel cells. The battery humidity control system comprises a battery stack, a cathode gas inlet module, a cathode steam-water separator, a discharge device and an anode gas inlet module. The cathode gas inlet module is connected with a cathode inlet of the cell stack, and the anode gas inlet module is connected with an anode inlet of the cell stack; an inlet of the cathode steam-water separator is connected with a cathode outlet of the cell stack; the cathode steam-water separator is also connected with the anode gas inlet module through an atomizer; and a cathode drainage outlet and a cathode exhaust outlet of the cathode steam-water separator are both connected with the discharge device. The gas at the cathode outlet is subjected to steam-water separation through the cathode steam-water separator, and the separated liquid water is used for adjusting the humidity of the anode of the fuel cell, so that the effectiveness and the accuracy of the humidity adjustment in the fuel cell are improved.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular to a battery humidity control system. Background Art

[0002] Humidity control has an important impact on the performance output and life of hydrogen fuel cells. On the one hand, the proton exchange membrane has a higher conductivity only when it is fully hydrated. The dry membrane state without water is prone to produce local hot spots, causing membrane perforation and failure. On the other hand, too much liquid water can easily cause "flooding" in the fuel stack, blocking the anode and cathode fuel transmission channels, causing gas deficiency in the catalyst layer and reducing reaction activity.

[0003] At present, low-power fuel cell systems usually use the "self-humidification" method, and the water produced by the cathode reaction meets the humidification requirements of the proton exchange membrane; for high-power fuel cell systems, "self-humidification" cannot meet the humidification requirements, and external humidification is required. Usually, a humidifier device is added to the cathode, and the humidified air at the cathode outlet humidifies the humidifier, and the humidifier then humidifies the inlet air. However, this method cannot adjust the inlet humidity, and the anode still relies on the cathode permeate water for humidification, and cannot achieve precise and controllable water management. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the embodiment of the present application is to provide a battery humidity control system, including:

[0005] Battery stack;

[0006] A cathode air intake module connected to the cathode inlet of the battery stack;

[0007] A cathode steam-water separator, the inlet of which is connected to the cathode outlet of the battery stack, and the cathode steam-water separator is used to separate steam and water from the air input from the inlet of the cathode steam-water separator, and store liquid water obtained by the steam-water separation;

[0008] a discharge device, connected to the cathode water discharge outlet and the cathode exhaust outlet of the cathode steam-water separator respectively;

[0009] The anode air intake module is connected to the anode inlet of the battery stack and is connected to the cathode drainage outlet through an atomizer.

[0010] In an embodiment of the present application, the cathode air intake module includes an air input submodule, a first three-way valve, and a humidifier dry side;

[0011] The first valve port of the first three-way valve is connected to the air input submodule, the second valve port of the first three-way valve is connected to the inlet end of the dry side of the humidifier, and the third valve port of the first three-way valve is connected to the outlet end of the dry side of the humidifier;

[0012] The outlet end of the dry side of the humidifier is connected to the cathode inlet.

[0013] In an embodiment of the present application, the third valve port of the first three-way valve is also connected to the purge inlet of the battery stack;

[0014] The battery humidity control system also includes:

[0015] The bypass valve is installed between the third valve port of the first three-way valve and the purge inlet of the battery stack, and is used to control the on-off between the third valve port of the first three-way valve and the purge inlet.

[0016] In an embodiment of the present application, the battery control system further includes a first throttle valve, and the cathode steam-water separator further includes a cathode drain valve;

[0017] The first throttle valve is installed between the cathode exhaust outlet and the exhaust device, and is used to control the connection between the cathode exhaust outlet and the exhaust device;

[0018] The cathode drain valve is installed between the cathode drain outlet and the discharge device, and is used to control the on-off between the cathode drain outlet and the discharge device.

[0019] In an embodiment of the present application, the battery humidity control system further includes a second three-way valve and a first exhaust passage;

[0020] The first valve port of the second three-way valve is connected to the cathode outlet, the second valve port of the second three-way valve is connected to the inlet of the cathode steam-water separator, and the third valve port of the second three-way valve is connected to the inlet of the first exhaust channel.

[0021] In an embodiment of the present application, the first exhaust passage includes a humidifier wet side and a second throttle valve;

[0022] The third valve port of the second three-way valve is connected to the inlet of the wet side of the humidifier;

[0023] The second throttle valve is installed between the outlet of the wet side of the humidifier and the discharge device, and is used to control the connection and disconnection between the outlet of the wet side of the humidifier and the discharge device.

[0024] In an embodiment of the present application, the battery humidity control system further includes a solenoid valve and a hydrogen circulation pump;

[0025] The cathode drainage outlet is connected to the anode air intake module through a solenoid valve, an atomizer and a hydrogen circulation pump in sequence.

[0026] In an embodiment of the present application, the battery control system further includes an anode steam-water separator, and the anode steam-water separator includes:

[0027] The anode drain valve is installed between the anode drain outlet of the anode steam-water separator and the cathode water inlet of the cathode steam-water separator, and is used to control the on-off between the anode drain outlet and the cathode water inlet.

[0028] In an embodiment of the present application, the inlet of the anode steam-water separator is connected to the anode outlet of the battery stack, and the anode steam-water separator is used to separate steam and water from the gas input from the inlet of the anode steam-water separator, and store liquid water obtained by steam-water separation;

[0029] The first anode exhaust outlet of the anode steam-water separator is connected to the exhaust device;

[0030] The second anode exhaust outlet of the anode steam-water separator is connected to the anode air intake module of the battery stack.

[0031] In an embodiment of the present application, the cathode air intake module includes an air filter, an air compressor, and an intercooler connected in sequence;

[0032] The air filter is used to filter the input air, and the intercooler is connected to the cathode inlet of the battery stack.

[0033] In an embodiment of the present application, the exhaust device includes a mixer and a muffler.

[0034] In an embodiment of the present application, the battery humidity control system further includes:

[0035] A first humidity detection device and an air flow meter are installed at the cathode inlet of the battery stack;

[0036] The second humidity detection device is installed at the anode inlet of the battery stack.

[0037] The battery humidity control system includes a battery stack, a cathode air intake module, a cathode steam-water separator, a discharge device, and an anode air intake module. The cathode air intake module is connected to the cathode inlet of the battery stack, and the anode air intake module is connected to the anode inlet of the battery stack, so as to allow the air and hydrogen for the redox reaction of the battery stack to be introduced; the inlet of the cathode steam-water separator is connected to the cathode outlet of the battery stack, and the cathode steam-water separator is used to separate steam and water from the air flowing out of the cathode outlet, and store the liquid water obtained by the steam-water separation; and the cathode steam-water separator is also connected to the anode air intake module through an atomizer, and when the humidity of the anode air intake module is insufficient, the liquid water stored in the cathode steam-water separator can be atomized by the atomizer and then enter the anode air intake module to achieve humidification of the anode of the fuel cell; the cathode drainage outlet and the cathode exhaust outlet of the cathode steam-water separator are both connected to the discharge device, so as to discharge the gas separated from the cathode steam-water separator and the excess liquid stored. The cathode outlet gas is separated into steam and water by a cathode steam-water separator, and the separated liquid water is used to adjust the humidity of the fuel cell anode, thereby improving the effectiveness and accuracy of the humidity regulation inside the fuel cell.

[0038] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0040] Figure 1 This is a schematic diagram of the structure of a battery humidity control system according to an embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the structure of a battery humidity control system according to another embodiment of the present application.

[0042] Description of Reference Numerals

[0043] 100, battery stack; 200, cathode air intake module; 300, cathode steam-water separator; 400, discharge device; 500, anode air intake module; 600, atomizer; 210, air input submodule; 220, first three-way valve; 230, humidifier dry side; 110, bypass valve; 120, first throttle valve; 310, cathode drain valve; 130, second three-way valve; 140, first exhaust channel; 141, humidifier wet side; 142, second throttle valve; 150, solenoid valve; 160, hydrogen circulation pump; 700, anode steam-water separator; 710, anode drain valve; 510, air filter; 520, air compressor; 530, intercooler; 410, mixer 420, muffler; 810, first humidity detection device; 820, air flow meter; 900, second humidity detection device. DETAILED DESCRIPTION

[0044] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0045] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0047] Figure 1 The battery humidity control system of the first embodiment of the present application is schematically shown. Figure 1 As shown, in one embodiment of the present application, a battery humidity control system is provided, the battery humidity control system comprising:

[0048] Battery stack 100;

[0049] A cathode air intake module 200 connected to the cathode inlet of the battery stack 100;

[0050] A cathode steam-water separator 300, the inlet of which is connected to the cathode outlet of the battery stack 100, and the cathode steam-water separator 300 is used to separate steam and water from the air input from the inlet of the cathode steam-water separator 300, and store liquid water obtained by the steam-water separation;

[0051] The discharge device 400 is connected to the cathode water discharge outlet and the cathode exhaust outlet of the cathode steam-water separator 300 respectively;

[0052] The anode air intake module 500 is connected to the anode inlet of the battery stack 100 and is connected to the cathode drainage outlet through the atomizer 600 .

[0053] It should be noted that when the fuel cell is working, air and hydrogen are introduced into the positive and negative stages respectively, and the oxygen in the air is transmitted to the membrane electrode through the flow channel to undergo a redox reaction. The electrons at the cathode generate liquid water, part of which humidifies the membrane electrode, part of which diffuses to the cathode flow channel and is discharged with the air, and the other part penetrates into the anode and enters the hydrogen circulation system. In this embodiment, the battery humidity control system includes a battery stack 100, a cathode air intake module 200, a cathode steam-water separator 300, a discharge device 400, and an anode air intake module 500. Among them, a redox reaction is carried out in the battery stack 100, the cathode air intake module 200 and the anode air intake module 500 are used to introduce air and hydrogen respectively, and the discharge device 400 is used to discharge incompletely reacted or excess substances after the reaction. The cathode steam-water separator 300 can separate the gas from the gas to obtain the separated gas and liquid. The cathode drain outlet and cathode exhaust outlet of the cathode steam-water separator 300 are both connected to the discharge device 400. After the cathode steam-water separator 300 separates the gas into steam and water, the obtained gas will be discharged from the discharge device 400 through the cathode exhaust outlet, and the obtained liquid water will be stored in the cathode steam-water separator 300. After the stored liquid water reaches a certain threshold, the liquid water exceeding the threshold will be discharged from the discharge device 400 through the cathode drain outlet.

[0054] After the air enters the battery stack 100 and undergoes a reduction reaction, liquid water will be generated to achieve self-humidification, so the gas flowing out of the cathode outlet is humid air with high humidity. The cathode steam-water separator 300 is connected to the cathode outlet, and is used to separate steam and water from the gas flowing out of the cathode outlet, and store the liquid water obtained by the steam-water separation. The atomizer 600 is used to fully atomize the liquid water. The cathode steam-water separator 300 is connected to the anode air intake module 500 through the atomizer 600, and the anode air intake module 500 is connected to the anode inlet of the battery stack 100, so that the liquid water stored in the cathode steam-water separator 300 can be atomized by the atomizer 600 and enter the anode, thereby realizing the humidity regulation of the anode of the fuel cell.

[0055] In the above scheme, the battery humidity control system includes a battery stack 100 , a cathode air intake module 200 , a cathode steam-water separator 300 , a discharge device 400 and an anode air intake module 500 . Among them, the cathode air intake module 200 is connected to the cathode inlet of the battery stack 100, and the anode air intake module 500 is connected to the anode inlet of the battery stack 100, so as to realize the introduction of air and hydrogen for redox reaction of the battery stack 100; the inlet of the cathode steam-water separator 300 is connected to the cathode outlet of the battery stack 100, and the cathode steam-water separator 300 is used to separate steam and water from the air flowing out of the cathode outlet, and store liquid water obtained by steam-water separation; and the cathode steam-water separator 300 is also connected to the anode air intake module 500 through the atomizer 600, and when the humidity of the anode air intake module 500 is insufficient, the liquid water stored in the cathode steam-water separator 300 can be atomized by the atomizer 600 and then enters the anode air intake module 500 to realize humidification of the anode of the fuel cell; the cathode drainage outlet and the cathode exhaust outlet of the cathode steam-water separator 300 are both connected to the discharge device 400, so as to realize the discharge of the gas separated in the cathode steam-water separator 300 and the excess liquid stored. The gas at the cathode outlet is separated into steam and water by the cathode steam-water separator 300, and the separated liquid water is used to adjust the humidity of the fuel cell anode, thereby improving the effectiveness and accuracy of the humidity regulation inside the fuel cell.

[0056] refer to Figure 2 , in one embodiment, the cathode air intake module 200 includes an air input submodule 210, a first three-way valve 220, and a humidifier dry side 230;

[0057] The first valve port of the first three-way valve 220 is connected to the air input submodule 210, the second valve port of the first three-way valve 220 is connected to the inlet end of the humidifier dry side 230, and the third valve port of the first three-way valve 220 is connected to the outlet end of the humidifier dry side 230;

[0058] The outlet end of the humidifier dry side 230 is connected to the cathode inlet.

[0059] In this embodiment, it should be noted that the humidifier is used to humidify the gas. The humidifier can be divided into a dry side and a wet side according to the humidity of the air introduced. The dry gas to be humidified is introduced into the dry side of the humidifier, and the gas or liquid with high humidity is introduced into the wet side of the humidifier. Because water can diffuse in the humidifier, water will diffuse from the high-concentration wet side to the low-concentration dry side to achieve humidification of the dry gas. The cathode air intake module 200 includes a dry side of the humidifier, which can be used to humidify the air introduced into the cathode air intake module 200. The air input submodule 210 is used to input air. The first three-way valve 220 includes three valve ports, namely the first valve port, the second valve port and the third valve port, wherein the first valve port is used for air intake, and the second valve port and the third valve port are used for air outlet. The amount of gas flowing out of the second valve port and the third valve port can be controlled by controlling the opening of the second valve port and the third valve port.

[0060] The first valve port is connected to the air input submodule 210, and is used to pass the air input by the air input submodule 210; the outlet end of the humidifier dry side 230 is connected to the cathode inlet, and the second valve port is connected to the inlet end of the humidifier dry side 230, and is used to pass the input air to the humidifier dry side 230 to humidify the air, and then the humidified air can enter the cathode inlet; the third valve port is connected to the outlet end of the humidifier dry side 230, that is, the third valve port bypasses the humidifier and is directly connected to the outlet end of the humidifier dry side 230, so that the input air is directly passed to the outlet end of the humidifier dry side 230, so that when the second valve port is closed, the unhumidified dry air can be directly passed into the cathode inlet, or when the second valve port is opened, the input dry air is merged with the humid air flowing out of the second valve port and then passed into the cathode inlet.

[0061] In this embodiment, the air humidity at the cathode inlet is controlled by the first three-way valve 220, which effectively improves the accuracy of humidity control at the cathode inlet.

[0062] refer to Figure 2 In one embodiment, the third valve port of the first three-way valve 220 is also connected to the purge inlet of the battery stack 100;

[0063] The battery humidity control system also includes:

[0064] The bypass valve 110 is installed between the third valve port of the first three-way valve 220 and the purge inlet of the battery stack 100, and is used to control the connection between the third valve port of the first three-way valve 220 and the purge inlet.

[0065] It should be noted that when the fuel cell enters the shutdown mode, the purge of the fuel cell will be started, and the residual liquid water and unreacted hydrogen in the battery cell will be quickly blown out by controlling the dry air to enter the purge inlet of the battery stack 100, so as to ensure that there will be no hydrogen-air interface after shutdown and the next startup, and high-potential corrosion of carbon base will be generated. In this embodiment, the third valve port of the first three-way valve 220 is not only connected to the cathode inlet through the outlet end of the dry side 230 of the humidifier, but also connected to the purge inlet of the battery stack 100 through the bypass valve 110. The bypass valve 110 is used to control the on-off between the third valve port and the purge inlet of the battery stack 100, that is, to control whether the dry air input by the air input module can enter the purge inlet.

[0066] In this embodiment, the bypass valve 110 is used to control the on / off between the third valve port and the purge inlet, thereby controlling the passage of dry air into the purge inlet of the battery stack 100 and ensuring the working performance of the fuel cell.

[0067] refer to Figure 2 , in one embodiment, the battery control system further includes a first throttle valve 120 , and the cathode steam-water separator 300 further includes a cathode drain valve 310 ;

[0068] The first throttle valve 120 is installed between the cathode exhaust outlet and the exhaust device 400, and is used to control the on-off between the cathode exhaust outlet and the exhaust device 400;

[0069] The cathode drain valve 310 is installed between the cathode drain outlet and the discharge device 400 , and is used to control the connection between the cathode drain outlet and the discharge device 400 .

[0070] It should be noted that the throttle refers to a valve that can be controlled to be on and off. The cathode steam-water separator 300 can separate steam and water from the gas to obtain separated gas and liquid. The cathode exhaust outlet of the cathode steam-water separator 300 is connected to the discharge device 400 through the first throttle 120. By controlling the first throttle 120 to open, the gas obtained by steam-water separation can be discharged from the discharge device 400 through the cathode exhaust outlet; the cathode drain outlet of the cathode steam-water separator 300 is connected to the discharge device 400 through the cathode drain valve 310. By controlling the cathode drain valve 310 to open, the liquid water obtained by steam-water separation can reach a certain threshold, and the liquid water exceeding the threshold can be discharged from the discharge device 400.

[0071] Furthermore, the cathode outlet of the battery stack 100 is connected to the inlet of the cathode steam-water separator 300, and the cathode exhaust outlet of the cathode steam-water separator 300 is connected to the discharge device 400 through the first throttle valve 120. Since the capacity of the pipeline and the cathode steam-water separator 300 is limited, after the gas flowing out of the cathode outlet fills the pipeline and the cathode steam-water separator 300, if the first throttle valve 120 is closed, no more gas can be introduced. Therefore, whether the gas flowing out of the cathode outlet can enter the cathode steam-water separator 300 can also be controlled by controlling the on and off of the first throttle valve 120.

[0072] In this embodiment, the first throttle valve 120 and the drain valve are used to effectively control the volume of gas and liquid in the cathode steam-water separator 300, thereby improving the accuracy of humidity control of the fuel cell.

[0073] refer to Figure 2 , in one embodiment, the battery humidity control system further includes a second three-way valve 130 and a first exhaust passage 140;

[0074] The first valve port of the second three-way valve 130 is connected to the cathode outlet, the second valve port of the second three-way valve 130 is connected to the inlet of the cathode steam-water separator 300 , and the third valve port of the second three-way valve 130 is connected to the inlet of the first exhaust channel 140 .

[0075] It should be noted that the gas flowing out of the cathode outlet is a gas with high humidity. In this embodiment, the cathode outlet is connected to the cathode outlet by the cathode steam-water separator 300, and the cathode steam-water separator 300 can be used to separate steam and water from the gas flowing out of the cathode outlet, so as to use the water separated from the gas to adjust the humidity of the fuel cell. The cathode steam-water separator 300 can store a limited amount of water. When the liquid water stored in the cathode steam-water separator 300 reaches or even exceeds the storage threshold value preset by the cathode steam-water separator 300, it is necessary to stop the introduction of wet gas. In this embodiment, the cathode outlet of the battery stack 100 is connected by the second three-way valve 130, and the gas flowing out of the cathode outlet is transferred to different places by the second three-way valve 130. Specifically, the first valve port of the second three-way valve 130 is connected to the cathode outlet for receiving the gas flowing out of the cathode outlet; the second valve port is connected to the inlet of the cathode steam-water separator 300 for passing the received gas to the cathode steam-water separator 300; the third valve port is connected to the inlet of the first exhaust channel 140 for passing the received gas to the first exhaust channel 140.

[0076] In this embodiment, the flow direction of the gas flowing out of the cathode outlet is controlled by the second three-way valve 130 to ensure the working efficiency of the cathode steam-water separator 300.

[0077] refer to Figure 2In one embodiment, the first exhaust passage 140 includes a humidifier wet side 141 and a second throttle valve 142;

[0078] The third valve port of the second three-way valve 130 is connected to the inlet of the wet side 141 of the humidifier;

[0079] The second throttle valve 142 is installed between the outlet of the wet side 141 of the humidifier and the exhaust device 400, and is used to control the connection and disconnection between the outlet of the wet side 141 of the humidifier and the exhaust device 400.

[0080] In this embodiment, it should be noted that the air flowing out of the cathode outlet can also be used to humidify the humidifier, and a high-humidity gas or liquid is introduced into the wet side of the humidifier so that the moisture in the introduced gas and liquid can diffuse in the humidifier, and diffuse from the high-concentration wet side to the low-concentration dry side, thereby humidifying the dry gas on the dry side 230 of the humidifier. Specifically, the third valve port of the second three-way valve 130 is connected to the inlet of the wet side 141 of the humidifier, and then the outlet of the wet side 141 of the humidifier is connected to the discharge device 400, so that the gas entering the first valve port of the second three-way valve 130 can pass into the wet side 141 of the humidifier, and be discharged from the discharge device 400 after passing through the humidifier. In this embodiment, a second throttle valve 142 installed between the outlet of the wet side 141 of the humidifier and the discharge device 400 is also included to control the on-off between the outlet of the wet side 141 of the humidifier and the discharge device 400. It is understandable that since the capacity of the pipeline and the humidifier is limited, after the gas flowing out of the cathode outlet fills the pipeline and the humidifier, if the second throttle valve 142 is closed, no more gas can be introduced. By controlling the on and off of the second throttle valve 142, it can be controlled whether the gas flowing out of the cathode outlet passes through the humidifier and is discharged from the exhaust device 400.

[0081] In this embodiment, the second throttle valve 142 is used to effectively control the flow direction of the high-humidity gas flowing out of the cathode outlet, thereby achieving reasonable utilization of the water vapor inside the fuel cell and improving the accuracy of humidity control of the fuel cell.

[0082] refer to Figure 2 , in one embodiment, the battery humidity control system further includes a solenoid valve 150 and a hydrogen circulation pump 160;

[0083] The cathode drainage outlet is connected to the anode air intake module 500 through the solenoid valve 150 , the atomizer 600 and the hydrogen circulation pump 160 in sequence.

[0084] In this embodiment, it should be noted that the solenoid valve 150 can control the on-off of the pipeline, and the opening and closing time of the solenoid valve 150 can be controlled by controlling the duty cycle of the solenoid valve 150. The cathode drainage outlet is connected to the anode air intake module 500 through the solenoid valve 150, the atomizer 600 and the hydrogen circulation pump 160 in sequence, so that the liquid water stored in the anode steam-water separator 700 enters the anode air intake module 500 after being fully atomized. The solenoid valve 150 is used to realize the on-off between the cathode drainage outlet and the anode air intake module 500, effectively controlling whether the liquid water stored in the cathode steam-water separator 300 enters the anode of the fuel cell, and effectively controlling the degree of humidity regulation of the anode of the fuel cell, thereby improving the accuracy of humidity regulation of the fuel cell.

[0085] refer to Figure 2 In one embodiment, the battery control system further includes an anode steam-water separator 700,

[0086] The inlet of the anode steam-water separator 700 is connected to the anode outlet of the battery stack 100. The anode steam-water separator 700 is used to separate steam and water from the gas input from the inlet of the anode steam-water separator 700 and store liquid water obtained by steam-water separation.

[0087] The first anode exhaust gas outlet of the anode steam-water separator 700 is connected to the exhaust device 400;

[0088] The second anode exhaust outlet of the anode steam-water separator 700 is connected to the anode air intake module 500 of the battery stack 100 .

[0089] In this embodiment, it should be noted that the anode steam-water separator 700 is connected to the anode outlet of the battery stack 100, and is used to separate the steam and water from the gas flowing out of the anode outlet to obtain the separated gas and liquid water. Among them, the separated gas can be recycled. However, since the gas at the anode outlet accumulates a lot of nitrogen, it is necessary to remove nitrogen to improve the effectiveness of the gas recycling after separation. In this embodiment, due to the different molar masses of nitrogen and hydrogen, the distribution positions in the anode steam-water separator 700 are also different. The first anode exhaust outlet of the anode steam-water separator 700 is installed at a position where nitrogen is more distributed, and the nitrogen can be discharged by opening the first anode exhaust outlet at a fixed time. Most of the mixed gas after the steam-water separation of the anode steam-water separator 700 will enter the anode air intake module 500 of the battery stack 100 to achieve gas circulation. In this embodiment, the anode steam-water separator 700 is connected to the anode air intake module 500 of the battery stack 100 through the second anode exhaust outlet. The anode air intake module 500 may further include an ejector or a hydrogen injection device to combine with the function of the hydrogen circulation pump 160 to pass the mixed gas after the separation of steam and water into the anode inlet of the battery stack 100.

[0090] In this embodiment, the gas flowing out of the anode outlet is separated into steam and water by the anode steam-water separator 700, and the excess nitrogen is discharged through the first anode exhaust outlet, thereby improving the recycling rate of hydrogen and ensuring the reaction efficiency of the fuel cell.

[0091] refer to Figure 2 In one embodiment, the anode steam-water separator 700 comprises:

[0092] The anode drain valve 710 is installed between the anode drain outlet of the anode steam-water separator 700 and the cathode water inlet of the cathode steam-water separator 300, and is used to control the connection between the anode drain outlet and the cathode water inlet.

[0093] In this embodiment, it should be noted that the liquid water stored in the anode steam-water separator 700 can be used to adjust the humidity of the anode inlet. Specifically, the anode steam-water separator 700 includes an anode drain valve 710, which can release the liquid water stored in the anode steam-water separator 700. The anode drain valve 710 is installed between the anode drain outlet of the anode steam-water separator 700 and the cathode water inlet of the cathode steam-water separator 300, and can be used to control the on-off between the anode drain outlet and the cathode water inlet, so that the liquid water stored in the anode steam-water separator 700 enters the cathode steam-water separator 300 under the action of gravity, and the cathode steam-water separator 300 stores the liquid water entering from the anode steam-water separator 700 together with the liquid water obtained after steam-water separation itself, so as to adjust the humidity of the anode of the fuel cell.

[0094] In this embodiment, the anode steam-water separator 700 and the cathode steam-water separator 300 are connected through the anode drain valve 710. When the liquid water stored in the anode steam-water separator 700 exceeds the pre-set drain threshold controlled by the anode drain valve 710, the anode drain valve 710 will be opened to allow the liquid water stored in the anode steam-water separator 700 to enter the cathode steam-water separator 300 under the action of gravity, thereby merging the liquid water separated by the anode steam-water separator 700 and the liquid water separated by the cathode steam-water separator 300 in the cathode steam-water separator 300. Liquid water. After the liquid water stored in the cathode steam-water separator 300 reaches a certain threshold, the liquid water exceeding the threshold will be discharged from the discharge device 400 through the cathode drainage outlet; and the cathode drainage outlet of the cathode steam-water separator 300 is connected to the anode air intake module 500 through the solenoid valve 150, the atomizer 600 and the hydrogen circulation pump 160 in sequence. Therefore, the liquid water stored in the cathode steam-water separator 300 can be used to provide a water source for the humidity regulation of the fuel cell anode, thereby improving the internal resource utilization rate of the fuel cell when it is working.

[0095] refer to Figure 2, in one embodiment, the cathode air intake module 200 includes an air filter 510, an air compressor 520, and an intercooler 530 connected in sequence;

[0096] The air filter 510 is used to filter the input air, and the intercooler 530 is connected to the cathode inlet of the battery stack 100 .

[0097] In this embodiment, it should be noted that the air filter 510 is used to filter the input air, the intercooler 530 is used to reduce the gas temperature, and the air compressor 520 is used to compress the gas. The cathode air intake module 200 includes an air filter 510, an air compressor 520 and an intercooler 530 connected in sequence to achieve the treatment of the fuel cell cathode inlet air and improve the working efficiency of the fuel cell.

[0098] refer to Figure 2 In one embodiment, the exhaust device 400 includes a mixer 410 and a muffler 420 .

[0099] In this embodiment, it should be noted that the mixer 410 is used to dilute the gas. For example, when the anode steam-water separator 700 discharges the gas to the discharge device 400 through the first anode exhaust outlet, a certain amount of hydrogen will inevitably be mixed in. Therefore, the gas discharged from the first anode exhaust outlet needs to be passed through the mixer 410 to be discharged after the gas concentration is diluted to ensure the safety of hydrogen use in the system. The gas discharged through the discharge device 400 is all passed through the mixer 410. After the gas is merged in the mixer 410, it is silenced by the muffler 420 and discharged to the atmosphere. The safety of the fuel cell is improved by the mixer 410 and the muffler 420.

[0100] refer to Figure 2 In one embodiment, the battery humidity control system further comprises:

[0101] The first humidity detection device 810 and the air flow meter 820 are installed at the cathode inlet of the battery stack 100;

[0102] The second humidity detection device 900 is installed at the anode inlet of the battery stack 100 .

[0103] In this embodiment, it should be noted that the first humidity detection device 810 and the second humidity detection device 900 are respectively installed at the cathode inlet and the anode inlet of the battery stack 100, and are used to detect the humidity of the cathode inlet and the humidity of the anode inlet, respectively, and the air flow meter 820 is installed at the cathode inlet of the battery stack 100, and is used to detect the gas flow at the cathode inlet. The humidity and air flow at the cathode inlet can be accurately grasped by the first humidity detection device 810 and the air flow meter 820, and the humidity at the anode inlet can be accurately grasped by the second humidity detection device 900, providing an effective reference for the humidity control of the fuel cell.

[0104] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0105] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0106] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0107] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A battery humidity control system, characterized in that: include: Battery stack; A cathode air intake module connected to the cathode inlet of the battery stack; a cathode steam-water separator, wherein the inlet of the cathode steam-water separator is connected to the cathode outlet of the battery stack, and the cathode steam-water separator is used to separate steam and water from the air input from the inlet of the cathode steam-water separator, and store liquid water obtained by steam-water separation; A discharge device, connected to the cathode water discharge outlet and the cathode exhaust outlet of the cathode steam-water separator respectively; The anode air intake module is connected to the anode inlet of the battery stack and is connected to the cathode drainage outlet through an atomizer.

2. The battery humidity control system according to claim 1, characterized in that: The cathode air intake module includes an air input submodule, a first three-way valve and a humidifier dry side; The first valve port of the first three-way valve is connected to the air input submodule, the second valve port of the first three-way valve is connected to the inlet end of the dry side of the humidifier, and the third valve port of the first three-way valve is connected to the outlet end of the dry side of the humidifier; The outlet end of the dry side of the humidifier is connected to the cathode inlet.

3. The battery humidity control system according to claim 2, characterized in that: The third valve port of the first three-way valve is also connected to the purge inlet of the battery stack; The battery humidity control system further comprises: The bypass valve is installed between the third valve port of the first three-way valve and the purge inlet of the battery stack, and is used to control the connection between the third valve port of the first three-way valve and the purge inlet.

4. The battery humidity control system according to claim 1, characterized in that: The battery humidity control system further includes a first throttle valve, and the cathode steam-water separator further includes a cathode drain valve; The first throttle valve is installed between the cathode exhaust outlet and the exhaust device, and is used to control the connection between the cathode exhaust outlet and the exhaust device; The cathode drain valve is installed between the cathode drain outlet and the discharge device, and is used to control the connection and disconnection between the cathode drain outlet and the discharge device.

5. The battery humidity control system according to claim 1, characterized in that: The battery humidity control system further includes a second three-way valve and a first exhaust passage; The first valve port of the second three-way valve is connected to the cathode outlet, the second valve port of the second three-way valve is connected to the inlet of the cathode steam-water separator, and the third valve port of the second three-way valve is connected to the inlet of the first exhaust channel.

6. The battery humidity control system according to claim 5, characterized in that: The first exhaust passage includes a humidifier wet side and a second throttle valve; The third valve port of the second three-way valve is connected to the inlet of the wet side of the humidifier; The second throttle valve is installed between the outlet of the wet side of the humidifier and the discharge device, and is used to control the connection and disconnection between the outlet of the wet side of the humidifier and the discharge device.

7. The battery humidity control system according to claim 1, characterized in that: The battery humidity control system also includes a solenoid valve and a hydrogen circulation pump; The cathode drainage outlet is connected to the anode air intake module through the solenoid valve, the atomizer and the hydrogen circulation pump in sequence.

8. The battery humidity control system according to claim 1, characterized in that: The battery humidity control system further includes an anode steam-water separator, and the anode steam-water separator includes: The anode drain valve is installed between the anode drain outlet of the anode steam-water separator and the cathode water inlet of the cathode steam-water separator, and is used to control the connection between the anode drain outlet and the cathode water inlet.

9. The battery humidity control system according to claim 8, characterized in that: The inlet of the anode steam-water separator is connected to the anode outlet of the battery stack, and the anode steam-water separator is used to separate steam and water from the gas input from the inlet of the anode steam-water separator and store liquid water obtained by steam-water separation; The first anode exhaust outlet of the anode steam-water separator is connected to the exhaust device; The second anode exhaust outlet of the anode steam-water separator is connected to the anode air intake module of the battery stack.

10. The battery humidity control system according to claim 1, characterized in that: The cathode air intake module includes an air filter, an air compressor and an intercooler connected in sequence; The air filter is used to filter input air, and the intercooler is connected to the cathode inlet of the battery stack.

11. The battery humidity control system according to claim 1, characterized in that: The discharge device includes a mixer and a muffler.

12. The battery humidity control system according to claim 1, characterized in that: The battery humidity control system also includes: A first humidity detection device and an air flow meter are installed at the cathode inlet of the battery stack; The second humidity detection device is installed at the anode inlet of the battery stack.

Images