A method for solving end plate effect of fuel cell based on air-hydrogen hetero-side ventilation

Abstract

This invention discloses a solution to the endplate effect of a fuel cell based on air-hydrogen cross-venting, comprising a core, a cathode single-side plate, an anode single-side plate, a first half-blind plate, and a second half-blind plate. The core is located between the cathode single-side plate and the anode single-side plate. After startup and ventilation, to avoid high potential (clamp potential ≤ 0.8V), before the load reaches the required power current, the first half-blind plate can introduce excess air within S1 time to remove the liquid water remaining in the humidifier through the front cathode single-side plate, avoiding the single-low problem caused by the endplate effect. The same applies to the anode single-side plate on the second half-blind plate side. During cold start, the cold air from the outside is compressed by the air compressor and outputs a certain high-temperature and high-pressure gas. After the cathode single-side plate of the first half-blind plate and the last bipolar plate on the second half-blind plate side are vented with high-temperature air, they can effectively isolate the heat loss to the outside through the endplate, reduce the condensation of liquid water due to the temperature drop at the endplate, and thus avoid the single-low problem of the endplate.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of battery plates, in particular to a fuel cell end plate effect solution method based on air-hydrogen asymmetric ventilation. BACKGROUND

[0002] Fuel cell stacks, especially metal stacks, have a relatively obvious end plate effect problem. Mainly reflected in two aspects:

[0003] When starting at room temperature, due to the short purging time at the last shutdown, there is liquid water in the system humidifier, so that the liquid water will enter the stack with the air after starting, causing the first piece of the stack to be low; when cold starting, due to the good heat conduction performance of the metal plate, the heat is dissipated to the outside, causing the end plate temperature to be low, and the water generated after starting is easy to condense at low temperature, causing the end plate to be low.

[0004] In view of the end plate effect problem, the existing technology has the following several:

[0005] The first piece of the plate is specially treated, which can enhance the drainage capacity by deepening the first piece of the flow channel size method, but if too much liquid water enters the stack, there will still be a first piece of water blocking phenomenon;

[0006] Hydrogen and air false single pieces are added at the beginning and the end. Hydrogen plate is ventilated with hydrogen, and air plate is ventilated with air. This single piece form has a good end plate prevention effect on the structure form of the air inlet on the same side of the stack, but for the hydrogen-air asymmetric ventilation mode, it cannot achieve effective prevention effect, and causes low efficiency of hydrogen utilization. SUMMARY

[0007] The present application mainly provides a fuel cell end plate effect solution method based on air-hydrogen asymmetric ventilation to solve the technical problems raised in the background technology.

[0008] The technical solution adopted by the present application to solve the above technical problems is:

[0009] A fuel cell end plate effect solution method based on air-hydrogen asymmetric ventilation, comprising a stack core, a cathode single-sided plate, an anode single-sided plate, a first half-blind plate and a second half-blind plate, the method comprising the following steps:

[0010] Step one, after starting, the first half-blind plate air inlet side plate is ventilated with air, and the second half-blind plate hydrogen inlet side plate is ventilated with hydrogen;

[0011] Step two, first, the clamp potential is ≤0.8V, and before the current is pulled to the required power, the first half-blind plate air side can be ventilated with excess air within S1 time to remove the liquid water remaining in the humidifier through the first N pieces of cathode single-sided plate;

[0012] Step three, when cold starting, the cold air outside is compressed by the air compressor, and the outgas is a gas with relatively high temperature and pressure, the N cathode single-sided plates on the air side and the last anode single-sided plate on the hydrogen side are passed through the relatively high temperature air with a certain temperature.

[0013] Preferably, the stack core is located between the cathode single-sided plate and the anode single-sided plate, the first half-blind plate is located on the side of the cathode single-sided plate away from the stack core, and the second half-blind plate is located on the side of the anode single-sided plate away from the stack core.

[0014] Preferably, the first half-blind plate is an air inlet half-blind plate, and the first half-blind plate is provided with an air inlet through hole.

[0015] Preferably, the second half-blind plate is a hydrogen inlet half-blind plate, and the second half-blind plate is provided with a hydrogen inlet through hole.

[0016] Preferably, the connecting rods are symmetrically connected to the outer walls at both ends of the stack core, the connecting rod at one end of the stack core penetrates the cathode single-sided plate and is fixedly connected with the first half-blind plate, and the connecting rod at the other end of the stack core penetrates the anode single-sided plate and is fixedly connected with the second half-blind plate.

[0017] Preferably, the number of cathode single-sided plates between the stack core and the first half-blind plate is several.

[0018] Preferably, one bipolar plate (6) is arranged between the stack core and the anode single-sided plate, and the number of anode single-sided plates between the bipolar plate and the second half-blind plate is several.

[0019] Preferably, the membrane electrode paper between the cathode single-sided plate and the anode single-sided plate is carbon paper.

[0020] Preferably, the connecting rod at one end of the stack core penetrates the cathode single-sided plates in sequence and is fixedly connected with the first half-blind plate.

[0021] Preferably, the connecting rod at the other end of the stack core penetrates the anode single-sided plates in sequence and is fixedly connected with the second half-blind plate.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] In view of the problems in the background art, after starting, air is introduced into the air inlet through holes of the first half blind plate, and hydrogen is introduced into the hydrogen inlet through holes of the second half blind plate. Firstly, in order to avoid high potential, the potential is ≤0.8V, and before the current is pulled to the required power current, the first half blind plate can introduce excess air within S1 time to remove the liquid water remaining in the humidifier through the front N cathode single-sided plates, thereby avoiding the single low problem caused by the end plate effect; similarly, the anode single-sided plate on the second half blind plate side can also effectively solve the end plate effect problem caused by the liquid water on the anode side.

[0024] When cold starting, the cold air outside is compressed by the air compressor to form a gas with a certain relative high temperature and pressure. After the cathode single-sided plate of the first half blind plate and the last bipolar plate on the second half blind plate side are introduced into the air with a certain temperature, the heat loss to the outside through the first half blind plate and the second half blind plate can be effectively insulated, and the condensed liquid water caused by the temperature reduction of the first half blind plate and the second half blind plate can be reduced, thereby effectively avoiding the end plate single low problem.

[0025] The application will be explained in detail below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a whole structure diagram of the application;

[0027] Figure 2 It is a bipolar plate position diagram of the application;

[0028] Figure 3 It is a bipolar plate position diagram of the application; Figure 1 It is an A area enlarged diagram of the application;

[0029] Figure 4 It is a first half blind plate diagram of the application;

[0030] Figure 5 It is a flow chart of the application.

[0031] BRIEF DESCRIPTION OF DRAWINGS: 1, a core; 11, a connecting rod; 2, a cathode single-sided plate; 3, an anode single-sided plate; 4, a first half blind plate; 5, a second half blind plate; 6, a bipolar plate. DETAILED DESCRIPTION

[0032] In order to facilitate understanding of the application, the application will be described more fully below with reference to the related drawings, which show several embodiments of the application. However, the application can be realized in different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the application more thorough and comprehensive.

[0033] It is to be understood that where an element such as a layer, region or substrate is described as being "on" another element, it can be directly on the other element or intervening elements can also be present. Where an element such as a layer, region or substrate is described as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] Please refer to the drawings carefully Figure 1 and 5 As shown in the drawings, in a preferred embodiment of the application, a fuel cell end plate effect solution method based on air-hydrogen unilateral ventilation, comprising a core 1, a cathode unilateral plate 2, an anode unilateral plate 3, a first half-blind plate 4 and a second half-blind plate 5, the method comprises the following steps: Step one, after starting, the first half-blind plate (4) air-in side plate is ventilated with air, and the second half-blind plate 5 hydrogen-in side plate is ventilated with hydrogen; Step two, first, in order to avoid high potential, clamp potential ≤ 0.8V, before pulling the load to the required power current, the first half-blind plate 4 air side can ventilate excess air within S1 time, and the liquid water remaining in the humidifier is removed through the first N cathode unilateral plate 2 to avoid the single low problem caused by the end plate effect; Similarly, the second half-blind plate 5 hydrogen-in side anode single plate can also effectively solve the end plate effect problem caused by the liquid water on the anode side; Step three, during cold start, the cold air from outside is compressed by the air compressor to become a gas with a certain relative high temperature and pressure, and the N cathode unilateral plate 2 on the air side and the last anode unilateral plate 3 on the hydrogen side can effectively isolate the heat loss to the outside through the first half-blind plate 4 and the second half-blind plate 5 after being ventilated with the relatively high temperature air with a certain temperature, thereby reducing the condensed liquid water caused by the temperature reduction at the first half-blind plate 4 and the second half-blind plate 5, and effectively avoiding the end plate single low problem.

[0036] Please refer to the drawings carefully Figures 1-4As shown, in another preferred embodiment of the application, the core 1 is located between the cathode single-sided plate 2 and the anode single-sided plate 3, the first half-blind plate 4 is located on the side of the cathode single-sided plate 2 away from the core 1, the second half-blind plate 5 is located on the side of the anode single-sided plate 3 away from the core 1, the first half-blind plate 4 is an air inlet end plate, the first half-blind plate 4 is provided with air inlet holes, air is introduced into the first half-blind plate 4 through the air inlet holes, the number of cathode single-sided plates 2 between the core 1 and the first half-blind plate 4 is several, the second half-blind plate 5 is a hydrogen inlet end plate, the second half-blind plate 5 is provided with hydrogen inlet holes, hydrogen is introduced into the second half-blind plate 5 through the hydrogen inlet holes, a bipolar plate 6 is arranged between the core 1 and the anode single-sided plate 3, the number of anode single-sided plates 3 between the bipolar plate 6 and the second half-blind plate 5 is several, the membrane electrode paper between the cathode single-sided plate 2 and the anode single-sided plate 3 is carbon paper, and the CCM has no additional catalyst. After starting, air is introduced into the first half-blind plate 4 through the air inlet holes, and hydrogen is introduced into the second half-blind plate 5 through the hydrogen inlet holes. First, in order to avoid high potential, the potential is clamped to be less than or equal to 0.8 V, and before the current is pulled to the required power, the first half-blind plate 4 can introduce excess air within S1 time to remove the liquid water remaining in the humidifier through the front cathode single-sided plate 2, so as to avoid the single low problem caused by the end plate effect. Similarly, the anode single-sided plate 3 on the side of the second half-blind plate 5 can also effectively solve the end plate effect problem caused by the liquid water on the anode side. When cold starting, the cold air outside is compressed by the air compressor to become a gas with a certain relative high temperature and pressure, and the cathode single-sided plate 2 on the side of the first half-blind plate 4 and the last bipolar plate 6 on the side of the second half-blind plate 5 can effectively isolate the heat loss to the outside through the end plate after the relative high temperature air with a certain temperature is introduced, reduce the condensed liquid water due to the temperature reduction of the end plate, and thus effectively avoid the end plate single low problem.

[0037] Specifically, please refer to the accompanying drawings Figures 1-3 In another preferred embodiment of the application, the connecting rods 11 are symmetrically connected to the outer walls at both ends of the core 1, the connecting rod 11 at one end of the core 1 penetrates through the cathode single-sided plate 2 and is fixedly connected with the first half-blind plate 4, the connecting rod 11 at the other end of the core 1 penetrates through the anode single-sided plate 3 and is fixedly connected with the second half-blind plate 5, the connecting rod 11 at one end of the core 1 penetrates through the cathode single-sided plates 2 in sequence and is fixedly connected with the first half-blind plate 4, and the connecting rod 11 at the other end of the core 1 penetrates through the anode single-sided plates 3 in sequence and is fixedly connected with the second half-blind plate 5. The connecting rod 11 at one end of the core 1 connects the cathode single-sided plates 2 in sequence and is fixedly connected with the first half-blind plate 4, the connecting rod 11 at the other end of the core 1 connects the bipolar plate 6 and the anode single-sided plates 3 in sequence and is fixedly connected with the second half-blind plate 5, and the fixed fastening is achieved.

[0038] The specific flow of the present application is as follows:

[0039] In use, after starting, the first half blind plate 4 air inlet hole into the air, the second half blind plate 5 hydrogen inlet hole into the hydrogen, first, to avoid high potential, clamp potential ≤ 0.8V, not to the demand power current before, the first half blind plate 4 can be in S1 time into excess air, the humidifier retained liquid water through the front cathode single sided plate 2 to exclude, avoid the single low problem caused by end plate effect; similarly, the anode single sided plate 3 of the second half blind plate 5 side can also effectively solve the end plate effect problem caused by liquid water on the anode side; cold start, the outside cold air through the air compressor after the gas is a certain relative high temperature and pressure gas, the cathode single sided plate 2 of the first half blind plate 4 side and the last bipolar plate 6 of the second half blind plate 5 side can effectively isolate the heat loss through the end plate, reduce the condensate liquid water due to the temperature reduction at the end plate, thereby effectively avoiding the end plate single low problem.

[0040] The above describes the present application with reference to the drawings, obviously the specific implementation of the present application is not limited by the above manner, as long as the method concept and technical scheme of the present application are adopted for such non substantial improvement, or the concept and technical scheme of the present application are directly applied to other occasions without improvement, all within the protection scope of the present application.

Claims

1. A fuel cell end plate effect solution method based on air-hydrogen hetero-side ventilation, comprising a reactor core (1), a cathode single-sided plate (2), an anode single-sided plate (3), a first half-blind plate (4) and a second half-blind plate (5), characterized in that: The core (1) is located between the cathode single-sided plate (2) and the anode single-sided plate (3), the first half-blind plate (4) is located on the side of the cathode single-sided plate (2) away from the core (1), and the second half-blind plate (5) is located on the side of the anode single-sided plate (3) away from the core (1); The method comprises the following steps: Step one: after starting, the first half-blind plate (4) is connected to the air inlet side plate to introduce air, and the second half-blind plate (5) is connected to the hydrogen inlet side plate to introduce hydrogen; Step two: first, the potential of the clamp is less than or equal to 0.8V, and before the load is pulled to the required power current, the first half-blind plate (4) can be connected to the air inlet side to introduce excess air within S1 time, so as to remove the liquid water remaining in the humidifier through the first N cathode single-sided plates (2); Step three: when cold starting, the compressed air from the air compressor is a gas with relatively high temperature and pressure, and the N cathode single-sided plates (2) on the air inlet side and the last anode single-sided plate (3) on the hydrogen inlet side are connected to the air with relatively high temperature.

2. A method for solving end plate effect of a fuel cell based on air-hydrogen hetero-ventilation according to claim 1, characterized in that: The first half-blind plate (4) is an air inlet half-blind plate, and the first half-blind plate (4) is provided with an air inlet through hole.

3. A method for solving end plate effect of fuel cell based on air-hydrogen hetero-ventilation, according to claim 1, characterized in that: The second half-blind plate (5) is a hydrogen inlet half-blind plate, and the second half-blind plate (5) is provided with a hydrogen inlet through hole.

4. The method of claim 1, wherein the fuel cell end plate effect is resolved based on the air-hydrogen hetero-ventilation. The connecting rods (11) are symmetrically connected to the outer walls of the two ends of the core (1), one end of the connecting rod (11) of the core (1) penetrates the cathode single-sided plate (2) and is fixedly connected with the first half-blind plate (4), and the other end of the connecting rod (11) of the core (1) penetrates the anode single-sided plate (3) and is fixedly connected with the second half-blind plate (5).

5. The method of claim 1, wherein the fuel cell end plate effect is resolved based on the air-hydrogen hetero-ventilation. The number of cathode single-sided plates (2) between the core (1) and the first half-blind plate (4) is several.

6. A method for solving end plate effect of fuel cell based on air-hydrogen hetero-ventilation, according to claim 1, characterized in that: A bipolar plate (6) is arranged between the core (1) and the anode single-sided plate (3), and the number of anode single-sided plates (3) between the bipolar plate (6) and the second half-blind plate (5) is several.

7. A method for solving end plate effect in a fuel cell based on air-hydrogen hetero-ventilation according to claim 1, characterized in that: The membrane electrode paper between the cathode single-sided plate (2) and the anode single-sided plate (3) is carbon paper.

8. A method for solving end plate effect of a fuel cell based on air-hydrogen hetero-ventilation, according to claim 1, characterized in that: The connecting rod (11) of one end of the core (1) penetrates the cathode single-sided plates (2) and the first half-blind plate (4) in sequence and is fixedly connected.

9. A method for solving end plate effect of a fuel cell based on air-hydrogen hetero-ventilation according to claim 1, characterized in that: The connecting rod (11) of the other end of the core (1) penetrates the anode single-sided plates (3) and the second half-blind plate (5) in sequence and is fixedly connected.

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