Fuel cell testing device

Abstract

The utility model relates to the field of fuel cells, and provides a fuel cell testing device which comprises an anode gas branch used for being connected with an anode inlet of an electric pile of a fuel cell and providing anode gas for the electric pile, and the anode gas branch comprises an anode humidifying device used for humidifying the anode gas; the cathode gas branch is used for being connected with a cathode inlet of the electric pile and providing cathode gas for the electric pile, and the cathode gas branch comprises a cathode humidifying device used for humidifying the cathode gas; and the humidifying branch is communicated with at least one of the anode inlet and the cathode inlet and is used for humidifying at least one of the anode gas and the cathode gas. And the humidity of the anode gas in the anode gas branch or the humidity of the cathode gas in the cathode gas branch can be further increased through the humidification branch, so that the problem that the fuel cell testing device in the prior art is limited in gas humidification effect and cannot meet the requirement of a high-humidity test is solved or improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, in particular to a fuel cell testing device. Background Art

[0002] A fuel cell is a device that converts hydrogen and oxygen into electrical energy through chemical reactions. The only byproducts produced in the process are water and heat. It is regarded as an environmentally friendly and efficient energy conversion technology and has been widely used in transportation, electricity and other fields in recent years.

[0003] The fuel cell test device is used to test and verify the performance of fuel cells. When the fuel cell is subjected to a water flooding test through the fuel cell test device, humid anode gas and humid cathode gas need to be introduced into the anode and cathode of the stack respectively. The gaseous water in the gas condenses into liquid water. The liquid water entering the stack will cause blockage of part of the gas diffusion layer or flow channel, obstruction of gas passage, and reduction of single cell voltage. After a long period of water flooding test, the membrane electrode and bipolar plate of the stack will change, such as discoloration of the bipolar plate, etc. This provides a clear direction for exploring the specific failure mode of the stack caused by abnormal water flooding operation, as well as the analysis of the durability failure of the stack and the root cause locking.

[0004] In the related art, a fuel cell testing device uses a humidification tank to humidify the gas by bubbling or spraying. This humidification method has limited humidification effect on the gas and cannot meet the requirements of high humidity testing. Utility Model Content

[0005] The utility model provides a fuel cell testing device, which is used to solve or improve the defect that the fuel cell testing device in the related art has limited humidification effect on gas and cannot meet the requirement of high humidity testing.

[0006] In one aspect, the utility model provides a fuel cell testing device, comprising:

[0007] an anode gas branch, used to be connected to an anode inlet of a fuel cell stack and to provide anode gas to the fuel cell stack, wherein the anode gas branch includes an anode humidifying device for humidifying the anode gas;

[0008] A cathode gas branch, connected to a cathode inlet of the stack and providing cathode gas to the stack, wherein the cathode gas branch includes a cathode humidifying device for humidifying the cathode gas;

[0009] A humidifying branch is communicated with at least one of the anode inlet and the cathode inlet and is used for humidifying at least one of the anode gas and the cathode gas.

[0010] According to a fuel cell testing device provided by the utility model, the humidification branch includes an atomizing device, which is connected to the anode inlet or the cathode inlet and is used to provide water mist to the anode gas or the cathode gas.

[0011] According to a fuel cell testing device provided by the utility model, the humidification branch further includes a humidification temperature regulating device, the inlet end of the atomization device is provided with the humidification temperature regulating device, and the humidification temperature regulating device is used to regulate the water temperature.

[0012] According to a fuel cell testing device provided by the utility model, the humidification branch further includes a flow detection device, and the inlet end of the atomization device is provided with the flow detection device, and the flow detection device is used to detect the water flow at the inlet end of the atomization device.

[0013] According to a fuel cell testing device provided by the utility model, the humidification branch also includes a pressure reducing valve, a main control valve and a sub-control valve, the inlet of the pressure reducing valve is used to connect to a water source, the outlet of the pressure reducing valve is connected to the inlet of the main control valve, and two groups of atomizing devices are provided, the two groups of atomizing devices are respectively connected to the anode inlet and the cathode inlet, and the two groups of atomizing devices are connected to the outlet of the main control valve through the corresponding sub-control valve.

[0014] According to a fuel cell testing device provided by the utility model, the anode humidifying device comprises an anode humidifying tank, the inlet of the anode humidifying tank is for anode gas to enter, and the outlet of the anode humidifying tank is connected to the anode inlet;

[0015] And / or, the cathode humidifying device comprises a cathode humidifying tank, an inlet of the cathode humidifying tank is for cathode gas to enter, and an outlet of the cathode humidifying tank is connected to the cathode inlet.

[0016] According to a fuel cell testing device provided by the utility model, the anode gas branch further includes an anode heating device, and the anode heating device is arranged between the outlet of the anode humidifying tank and the corresponding atomizing device;

[0017] And / or, the cathode gas branch further comprises a cathode heating device, and the cathode heating device is arranged between the outlet of the cathode humidifying tank and the corresponding atomizing device.

[0018] According to a fuel cell testing device provided by the utility model, the anode gas branch further includes an anode control valve, and the anode control valve is arranged in parallel with the anode humidification tank;

[0019] And / or, the cathode gas branch further includes a cathode control valve, and the cathode control valve is arranged in parallel with the cathode humidifying tank.

[0020] According to a fuel cell testing device provided by the utility model, the anode humidifying device further comprises an anode temperature regulating device, the anode temperature regulating device is connected to the anode humidifying tank and is used to regulate the water temperature in the anode humidifying tank;

[0021] And / or, the cathode humidifying device further comprises a cathode temperature regulating device, wherein the cathode temperature regulating device is connected to the cathode humidifying tank and is used for regulating the water temperature in the cathode humidifying tank.

[0022] According to a fuel cell testing device provided by the utility model, it also includes a cooling device, and at least one group of the cooling devices is arranged between the outlet of the anode humidifying device and the corresponding atomizing device; and / or; at least one group of the cooling devices is arranged between the outlet of the cathode humidifying device and the corresponding atomizing device.

[0023] The fuel cell testing device provided by the utility model can pass anode gas into the fuel cell stack through the anode gas branch, and the anode humidifying device of the anode gas branch can humidify the anode gas. The cathode gas can be passed into the fuel cell stack through the cathode gas branch, and the cathode humidifying device of the cathode gas branch can humidify the cathode gas.

[0024] By humidifying at least one of the anode gas branch and the cathode gas branch through the humidification branch, the humidity of the anode gas in the anode gas branch can be further increased or the humidity of the cathode gas in the cathode gas branch can be increased, thereby solving or improving the problem in the related art that the fuel cell testing device has limited humidification effect on the gas and cannot meet the requirements of high humidity testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a structural schematic diagram of a fuel cell testing device provided in an embodiment of the utility model.

[0027] Reference numerals:

[0028] 1. Anode gas branch; 101. Anode humidifying device; 101a. Anode humidifying tank; 101b. Anode water pump; 101c. First heater; 101d. First heat exchanger; 102. Anode control valve; 103. Anode heating device; 2. Cathode gas branch; 201. Cathode humidifying device; 201a. Cathode humidifying tank; 201b. Cathode water pump; 201c. Second heater; 201d. Second heat exchanger; 202. Cathode control valve; 203. Cathode heating device; 3. Humidification branch; 301. Atomizing device; 302. Humidification temperature regulating device; 302a. Third heater; 302b. Third heat exchanger; 303. Flow detection device; 304. Pressure reducing valve; 305. Main control valve; 306. Sub-control valve; 4. Fuel cell; 5. Cooling device. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Combine the following Figure 1 A fuel cell testing device provided in an embodiment of the present utility model is described.

[0031] Specifically, the fuel cell testing device includes an anode gas branch 1 , a cathode gas branch 2 and a humidification branch 3 .

[0032] The anode gas branch 1 is used to connect to the anode inlet of the fuel cell stack 4 and provide anode gas to the stack 4. For example, the inlet of the anode gas branch 1 is connected to the storage container of the anode gas, and the anode gas can be hydrogen. The anode gas branch 1 includes an anode humidifying device 101 for humidifying the anode gas. The anode inlet includes but is not limited to the stack anode inlet and the pipeline assembly of the stack anode inlet.

[0033] The cathode gas branch 2 is used to be connected to the cathode inlet of the stack 4 and provide cathode gas to the stack 4. For example, the inlet of the cathode gas branch 2 is connected to a storage container of the cathode gas, and the cathode gas can be oxygen or air. The cathode gas branch 2 includes a cathode humidifying device 201 for humidifying the cathode gas. The cathode inlet includes but is not limited to the stack cathode inlet and the pipeline assembly of the stack cathode inlet.

[0034] The humidifying branch 3 is in communication with at least one of the anode inlet and the cathode inlet, and is used to humidify at least one of the anode gas and the cathode gas.

[0035] The fuel cell testing device provided in the embodiment of the utility model can pass anode gas into the fuel cell stack 4 through the anode gas branch 1, and the anode humidifying device 101 of the anode gas branch 1 can humidify the anode gas. The cathode gas can be passed into the fuel cell stack 4 through the cathode gas branch 2, and the cathode humidifying device 201 of the cathode gas branch 2 can humidify the cathode gas.

[0036] By humidifying at least one of the anode gas branch and the cathode gas branch through the humidification branch 3, the humidity of the anode gas in the anode gas branch 1 can be further increased or the humidity of the cathode gas in the cathode gas branch 2 can be increased, thereby solving or improving the problem in the related art that the fuel cell testing device has limited humidification effect on the gas and cannot meet the requirements of high humidity testing.

[0037] In some embodiments provided by the present utility model, the humidification branch 3 includes an atomizing device 301, which is connected to the anode inlet or the cathode inlet and is used to provide water mist to the anode gas branch 1 or the cathode gas branch 2. The atomizing device 301 is used to atomize water into water mist. The water is deionized water.

[0038] In this embodiment, the humidification branch 3 can provide water mist to the anode gas branch 1 or the cathode gas branch 2 through the atomization device 301, thereby further increasing the humidity of the anode gas in the anode gas branch 1 or increasing the humidity of the cathode gas in the cathode gas branch 2, thereby solving or improving the problem in the related technology that the fuel cell testing device has limited humidification effect on the gas and cannot meet the requirements of high humidity testing.

[0039] In some embodiments provided by the present invention, the atomizing device 301 may include an atomizing nozzle. In this embodiment, the atomizing nozzle has a simple structure and is easy to repair and maintain. Of course, the atomizing device 301 is not limited to including an atomizing nozzle. For example, in other embodiments provided by the present invention, the atomizing device 301 includes an ultrasonic atomizer. The water mist particles generated by the ultrasonic atomizer are uniform and have a small particle size.

[0040] In some embodiments provided by the present utility model, the humidification branch 3 further includes a humidification temperature regulating device 302. The inlet end of the atomization device 301 is provided with a humidification temperature regulating device 302, and the humidification temperature regulating device 302 is used to adjust the water temperature. In this embodiment, the humidification temperature regulating device 302 is provided to adjust the water temperature before the water enters the atomization device 301, so that the water temperature is within a suitable range, reducing the influence of the water temperature on the temperature of the anode gas or the temperature of the cathode gas.

[0041] Optionally, the humidification temperature adjustment device 302 includes a third heater 302a and a third heat exchanger 302b arranged in series. The outlet of the third heat exchanger 302b is connected to the atomization device 301. When the water temperature is too low, the water can be heated by the third heater 302a, and when the water temperature is too high, the water can be cooled by the third heat exchanger 302b. In this way, the water can be heated and cooled, and the adjustment range of the water temperature is improved.

[0042] Furthermore, the third heater 302a may be an electric heater, and the third heat exchanger 302b may be a plate heat exchanger, and air cooling or water cooling is used for cooling.

[0043] In some embodiments provided by the present utility model, the humidification branch 3 further includes a flow detection device 303, and the inlet end of the atomization device 301 is provided with a flow detection device 303, and the flow detection device 303 is used to detect the water flow at the inlet end of the atomization device 301. In this embodiment, the amount of water mist provided by the atomization device 301 can be calculated by the flow detection device 303, so as to calculate the humidity of the anode gas or cathode gas after the water mist is mixed with the anode gas or cathode gas.

[0044] In some embodiments provided by the present utility model, the humidification branch 3 further includes a pressure reducing valve 304, a main control valve 305 and a sub-control valve 306. The inlet of the pressure reducing valve 304 is used to connect to a water source, for example, the water source includes a water tank and a water pump, and the water tank is connected to the pressure reducing valve 304 through the water pump and supplies water to the pressure reducing valve 304. The outlet of the pressure reducing valve 304 is connected to the inlet of the main control valve 305. Two groups of atomizing devices 301 are provided, and the two groups of atomizing devices 301 are respectively connected to the anode inlet and the cathode inlet, and the two groups of atomizing devices 301 are connected to the outlet of the main control valve 305 through the corresponding sub-control valve 306.

[0045] In this embodiment, the water pressure can be adjusted and stabilized by the pressure reducing valve 304, the on-off of the humidification branch 3 can be controlled by the main control valve 305, and the flow rate or on-off of the corresponding atomizing device 301 can be adjusted by the sub-control valve 306. For example, when high humidity is not required, the main control valve 305 or the corresponding sub-control valve 306 can be closed, and the humidification process is performed only by the anode humidification device 101 or the cathode humidification device 201.

[0046] In some embodiments provided by the utility model, the anode humidifying device 101 includes an anode humidifying tank 101a. The inlet of the anode humidifying tank 101a is for the anode gas to enter, and the outlet of the anode humidifying tank 101a is connected to the anode inlet. Specifically, there is deionized water at a certain temperature in the anode humidifying tank 101a, and the anode gas enters from the lower part of the anode humidifying tank 101a, flows out from the upper part of the lower part of the anode humidifying tank 101a through bubbling or spraying, and enters the battery stack 4. In this way, the cathode humidifying tank 201a has a simple structure and low energy consumption.

[0047] In some embodiments provided by the present utility model, the anode gas branch 1 further includes an anode heating device 103. The anode heating device 103 is disposed between the outlet of the anode humidifying tank 101a and the corresponding atomizing device 301. The anode heating device 103 can heat the humidified anode gas so that the temperature of the anode gas is within a suitable range.

[0048] Alternatively, the anode heating device 103 may be an electric heater.

[0049] In some embodiments provided by the utility model, the anode gas branch 1 also includes an anode control valve 102. The anode control valve 102 is arranged in parallel with the anode humidification tank 101a. In this embodiment, by arranging the anode control valve 102 in parallel with the anode humidification tank 101a, when the anode control valve 102 is opened, since the resistance of the anode control valve 102 is smaller than the resistance of the anode humidification tank 101a, the anode gas does not pass through the anode humidification tank 101a, but directly passes through the anode control valve 102 to enter the fuel cell 4, so that the anode gas branch 1 can provide dry anode gas for the fuel cell 4, so as to simulate and detect the actual operating state of the fuel cell 4. When the anode humidification tank 101a is required to humidify the anode gas, the anode control valve 102 can be closed to allow the anode gas to pass through the anode humidification tank 101a.

[0050] In some embodiments provided by the present utility model, the anode humidifying device 101 further includes an anode temperature regulating device, which is connected to the anode humidifying tank 101a and is used to regulate the water temperature in the anode humidifying tank 101a. In this embodiment, the temperature of the water in the anode humidifying tank 101a is regulated by the anode temperature regulating device, so as to reduce the influence of the humidifying tank on the temperature of the anode gas.

[0051] Optionally, the anode temperature regulating device includes an anode water pump 101b, a first heater 101c and a first heat exchanger 101d arranged in series. The inlet of the anode water pump 101b is connected to the anode humidification tank 101a, and the outlet of the first heat exchanger 101d is connected to the anode humidification tank 101a. When the water temperature is too low, the water can be heated by the first heater 101c, and when the water temperature is too high, the water can be cooled by the first heat exchanger 101d. In this way, the water can be heated and cooled, which increases the adjustment range of the water temperature.

[0052] Furthermore, the first heater 101c may be an electric heater, and the first heat exchanger 101d may be a plate heat exchanger, and air cooling or water cooling is used for cooling.

[0053] In some embodiments provided by the present invention, the cathode humidifying device 201 includes a cathode humidifying tank 201a. The inlet of the cathode humidifying tank 201a is for cathode gas to enter, and the outlet of the cathode humidifying tank 201a is connected to the cathode inlet. Specifically, there is deionized water at a certain temperature in the cathode humidifying tank 201a, and the cathode gas enters from the lower part of the cathode humidifying tank 201a, flows out from the upper part of the lower part of the cathode humidifying tank 201a through bubbling or spraying, and enters the battery stack 4. In this way, the cathode humidifying tank 201a has a simple structure and low energy consumption.

[0054] In some embodiments provided by the present invention, the cathode gas branch 2 further includes a cathode heating device 203. The cathode heating device 203 is disposed between the outlet of the cathode humidifying tank 201a and the corresponding atomizing device 301. The cathode heating device 203 can heat the humidified cathode gas so that the temperature of the cathode gas is within a suitable range.

[0055] Optionally, the cathode heating device 203 may be an electric heater.

[0056] In some embodiments provided by the utility model, the cathode gas branch 2 also includes a cathode control valve 202. The cathode control valve 202 is arranged in parallel with the cathode humidifying tank 201a. In this embodiment, by arranging the cathode control valve 202 in parallel with the cathode humidifying tank 201a, when the cathode control valve 202 is opened, since the resistance of the cathode control valve 202 is smaller than the resistance of the cathode humidifying tank 201a, the cathode gas does not pass through the cathode humidifying tank 201a, but directly passes through the cathode control valve 202 to enter the stack 4, so that the cathode gas branch 2 can provide dry cathode gas for the stack 4, so as to simulate and detect the actual operating state of the stack 4. When the cathode humidifying tank 201a is required to humidify the cathode gas, the cathode control valve 202 can be closed to allow the cathode gas to pass through the cathode humidifying tank 201a.

[0057] In some embodiments provided by the present invention, the cathode humidifying device 201 further includes a cathode temperature regulating device, which is connected to the cathode humidifying tank 201a and is used to regulate the water temperature in the cathode humidifying tank 201a. In this embodiment, the temperature of the water in the cathode humidifying tank 201a is regulated by the cathode temperature regulating device, so as to reduce the influence of the humidifying tank on the temperature of the cathode gas.

[0058] Optionally, the cathode temperature regulating device includes a cathode water pump 201b, a second heater 201c and a second heat exchanger 201d arranged in series. The inlet of the cathode water pump 201b is connected to the cathode humidifying tank 201a, and the outlet of the second heat exchanger 201d is connected to the cathode humidifying tank 201a. When the water temperature is too low, the water can be heated by the second heater 201c, and when the water temperature is too high, the water can be cooled by the second heat exchanger 201d. In this way, the water can be heated and cooled, which increases the adjustment range of the water temperature.

[0059] Furthermore, the second heater 201c may be an electric heater, and the second heat exchanger 201d may be a plate heat exchanger, and air cooling or water cooling is used for cooling.

[0060] In some embodiments provided by the present utility model, the fuel cell testing device further includes a cooling device 5. At least one set of cooling devices 5 is provided between the outlet of the anode humidifying device 101 and the corresponding atomizing device 301. And / or, at least one set of cooling devices 5 is provided between the outlet of the cathode humidifying device 201 and the corresponding atomizing device 301.

[0061] In this embodiment, when the dew point temperature is constant, the lower the gas temperature is, the greater the relative humidity is. Therefore, by cooling the anode gas or the cathode gas through the cooling device 5, the humidity of the anode gas or the cathode gas can also be increased.

[0062] Optionally, the cooling device 5 may be a plate heat exchanger.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A fuel cell testing device, characterized in that: include: An anode gas branch (1) is used to be connected to an anode inlet of a fuel cell stack (4) and to provide anode gas to the fuel cell stack (4); the anode gas branch (1) comprises an anode humidifying device (101) for humidifying the anode gas; A cathode gas branch (2) is used to be connected to a cathode inlet of the battery stack (4) and to provide cathode gas to the battery stack (4); the cathode gas branch (2) comprises a cathode humidifying device (201) for humidifying the cathode gas; A humidifying branch (3), the humidifying branch (3) being in communication with at least one of the anode inlet and the cathode inlet and used for humidifying at least one of the anode gas and the cathode gas.

2. The fuel cell testing device according to claim 1, characterized in that: The humidification branch (3) comprises an atomizing device (301), which is connected to the anode inlet or the cathode inlet and is used to provide water mist to the anode gas or the cathode gas.

3. The fuel cell testing device according to claim 2, characterized in that: The humidification branch (3) further comprises a humidification temperature regulating device (302), and the inlet end of the atomization device (301) is provided with the humidification temperature regulating device (302), and the humidification temperature regulating device (302) is used to regulate the water temperature.

4. The fuel cell testing device according to claim 2, characterized in that: The humidification branch (3) further comprises a flow detection device (303), and the inlet end of the atomization device (301) is provided with the flow detection device (303), and the flow detection device (303) is used to detect the water flow at the inlet end of the atomization device (301).

5. The fuel cell testing device according to claim 2, characterized in that: The humidification branch (3) also includes a pressure reducing valve (304), a main control valve (305) and a sub-control valve (306), wherein the inlet of the pressure reducing valve (304) is used to connect to a water source, and the outlet of the pressure reducing valve (304) is connected to the inlet of the main control valve (305). Two groups of atomizing devices (301) are provided, and the two groups of atomizing devices (301) are respectively connected to the anode inlet and the cathode inlet, and the two groups of atomizing devices (301) are connected to the outlet of the main control valve (305) through the corresponding sub-control valve (306).

6. The fuel cell testing device according to any one of claims 2 to 4, characterized in that: The anode humidifying device (101) comprises an anode humidifying tank (101a), the inlet of the anode humidifying tank (101a) is for anode gas to enter, and the outlet of the anode humidifying tank (101a) is connected to the anode inlet; And / or, the cathode humidifying device (201) comprises a cathode humidifying tank (201a), the inlet of the cathode humidifying tank (201a) is for cathode gas to enter, and the outlet of the cathode humidifying tank (201a) is connected to the cathode inlet.

7. The fuel cell testing device according to claim 6, characterized in that: The anode gas branch (1) further comprises an anode heating device (103), wherein the anode heating device (103) is arranged between the outlet of the anode humidifying tank (101a) and the corresponding atomizing device (301); And / or, the cathode gas branch (2) further comprises a cathode heating device (203), and the cathode heating device (203) is arranged between the outlet of the cathode humidifying tank (201a) and the corresponding atomizing device (301).

8. The fuel cell testing device according to claim 6, characterized in that: The anode gas branch (1) further comprises an anode control valve (102), wherein the anode control valve (102) is arranged in parallel with the anode humidification tank (101a); And / or, the cathode gas branch (2) further comprises a cathode control valve (202), and the cathode control valve (202) is arranged in parallel with the cathode humidifying tank (201a).

9. The fuel cell testing device according to claim 6, characterized in that: The anode humidifying device (101) further comprises an anode temperature regulating device, wherein the anode temperature regulating device is connected to the anode humidifying tank (101a) and is used to regulate the water temperature in the anode humidifying tank (101a); And / or, the cathode humidifying device (201) further comprises a cathode temperature regulating device, wherein the cathode temperature regulating device is connected to the cathode humidifying tank (201a) and is used to regulate the water temperature in the cathode humidifying tank (201a).

10. The fuel cell testing device according to any one of claims 2 to 4, characterized in that: It also includes a cooling device (5), wherein at least one group of the cooling devices (5) is arranged between the outlet of the anode humidifying device (101) and the corresponding atomizing device (301); and / or at least one group of the cooling devices (5) is arranged between the outlet of the cathode humidifying device (201) and the corresponding atomizing device (301).

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