CN222015450U - Pressure control device for fuel cell - Google Patents

Abstract

The utility model belongs to the field of fuel cell control devices, and particularly relates to a pressure control device for a fuel cell. The fuel cell is arranged in the sealed box body, and the sealed box body is provided with a purging inlet and a purging outlet; the purging outlet is connected with a safe explosion-proof ventilation valve; the air outlet of the sealed box body is connected with a humidifier, the humidifier is connected with a throttle valve, and the throttle valve is connected with a system mixing and discharging point. The utility model has simple pipeline, high airtight reliability, simple process and low installation and maintenance cost.

Description

Pressure control device for fuel cell

Technical Field

The utility model belongs to the field of fuel cell control devices, and particularly relates to a pressure control device for a fuel cell.

Background

Fuel cells are an efficient, clean energy conversion device, but their efficiency and life for long-term operation are affected by various factors. Purging is a common measure in fuel cells to remove the build-up inside the stack, improve efficiency and extend service life.

However, too small a purge amount may result in low pressure inside the stack, resulting in gas backflow, while too large a purge amount may result in too high pressure inside the stack, thereby affecting the stability and safety of the system. The difficulty in controlling the purge amount of the existing fuel cell system is a great difficulty in the current fuel cell technology. Some prior art schemes control the purge amount by installing a pressure sensor and a regulating valve, but the schemes are often complicated in structure, low in control accuracy and easy to be influenced by external environment.

On the other hand, the existing purging strategy needs to install pipelines with the electric pile purging air outlets connected to the mixed exhaust points, the arrangement environment of an actual system and the whole vehicle is often poor, the pipelines are complex, the more the pipelines are complex, the lower the airtight reliability of the more connecting ports is, the more complex the process is, and the higher the installation and maintenance costs are.

Disclosure of utility model

The present utility model overcomes the above-mentioned drawbacks by providing a pressure control device for a fuel cell that is simple in piping, highly reliable in airtight, simple in process, and low in installation and maintenance costs.

The object of the utility model is achieved by at least one of the following technical solutions.

The pressure control device for the fuel cell is arranged in a sealed box body, and a purging inlet and a purging outlet are formed in the sealed box body; the purging outlet is connected with a safe explosion-proof ventilation valve; the air outlet of the sealed box body is connected with a humidifier, the humidifier is connected with a throttle valve, and the throttle valve is connected with a system mixing and discharging point.

Further, the safety explosion-proof vent is mounted directly on the tank or on a pipe connected to the purge outlet on the sealed tank 3.

Further, the purge inlet is provided on a front end plate of the seal case.

Further, the purge outlet is provided on a rear end plate of the seal case.

Further, the number of the purging inlets is 4-6. To enable the purge gas to be purged uniformly, the four corners of the front end plate are preferably provided with purge ports (the schematic view is shown in fig. 5), wherein the purge ports 5 and 6 can be added according to the actual situation.

Further, the number of the purging outlets is 4-6.

Compared with the prior art, the utility model has the advantages that:

(1) The control device can accurately control the purging quantity and improve the stability of the internal pressure of the electric pile.

(2) The control device of the utility model completely replaces a pipeline with a purge air outlet connected to the mixing and discharging point, has simple structure, reduces the process difficulty and has low manufacturing cost.

(3) The control device is not easy to be influenced by external environment.

(4) According to the utility model, the positions of the inlet for supplementing the purge gas and the safe explosion-proof ventilation valve are reasonably arranged, so that the purge gas can be ensured to completely purge the space in the box body and finally discharged through the safe explosion-proof ventilation valve, and the purge effect and the stability of the system are improved.

Drawings

Fig. 1 is an external view (front face) of a pressure control device for a fuel cell of the present utility model;

Fig. 2 is an external view (back surface) of the pressure control device for a fuel cell of the present utility model;

FIG. 3 is a component connection view;

FIG. 4 is a schematic diagram of the structure before modification;

FIG. 5 is an exhaust diagram of the purge inlet.

The individual components in the figure are as follows: a purging inlet 1, a safe explosion-proof ventilation valve 2 and a sealed box body 3.

Detailed Description

The terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the description. As used in this specification, one or more embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in one or more embodiments of the present specification refers to and encompasses any or all possible combinations of one or more of the associated listed items.

As shown in fig. 1-3, the fuel cell stack is arranged in a sealed box body 3, and a purging inlet 1 and a purging outlet are formed in the sealed box body 3; the purging outlet is connected with a safe explosion-proof ventilation valve 2; the air outlet of the sealed box body 3 is connected with a humidifier 4, the humidifier 4 is connected with a throttle valve 5, and the throttle valve is connected with a system mixing and discharging point. The safety explosion-proof vent valve is directly mounted on the tank or connected to the pipe on the purge outlet on the sealed tank 3. As shown in fig. 1, the purge inlet 1 is provided on a front end plate of the seal case 3.

As shown in fig. 2, the purge outlet is provided on the rear end plate of the seal case 3. As shown in fig. 5, the number of the purge inlets 1 is 4 to 6. The number of the purging outlets is 4-6

The purging of the fuel cell refers to the process of purging the inside of the cell through gas path flow to help remove impurities and control the temperature during the operation of the fuel cell. As shown in fig. 1-3, the purge gas enters the electric pile through the purge inlet 1 to be purged, and is directly exhausted through the safety explosion-proof ventilation valve 2, when the pressure in the sealed box body is smaller than the explosion-proof opening pressure of the explosion-proof valve, the sealed box body is in a normal working state, and at the moment, the gas flows from the side with high pressure to the side with low pressure, so that the internal and external air pressure balance of the sealed box body 3 is realized. The pressure release channel is in a closed state, and plays a role of a waterproof ventilation valve in the closed state. When the preset pressure is reached (explosion-proof opening pressure), the valve core of the explosion-proof valve is opened, a rapid pressure relief channel is provided, the deformation of the sealed box body and even the generation of explosion are effectively prevented, and the explosion damage is reduced; when the pressure is relieved and the pressure inside and outside the sealed box body is balanced, the valve core of the explosion-proof valve can be automatically reset and sealed again, and the waterproof and breathable functions are restored again.

Specifically, the safety explosion-proof vent valve is mounted on the stack housing such that purge gas can only pass through the safety explosion-proof vent valve and cannot flow back into the stack. Once the pressure in the pile box body exceeds the set value, the pressure relief valve is automatically opened to release redundant gas.

In design, the exhaust pressure and the explosion-proof opening pressure of the safety explosion-proof ventilation valve can be optimized according to actual conditions so as to meet the requirement of the purging quantity. The set pressure of the safety explosion-proof ventilation valve needs to be reasonably set according to the strength and the blowing amount of the galvanic pile box body, so that redundant gas can be released in time all the time in the operation process. Meanwhile, the positions of the purging inlet of the galvanic pile and the safety explosion-proof ventilation valve are reasonably arranged (as shown in the attached drawing), the purging gas inlet is fixed on the end plate, and the safety explosion-proof ventilation valve is fixed on the rear end plate, so that the purging gas can completely purge the space in the box body and finally is discharged through the safety explosion-proof ventilation valve.

According to the utility model, the safe explosion-proof ventilation valve is used for replacing a pipeline with a pile purging air outlet connected to a mixing and discharging point, so that the pipeline from the purging outlet to the mixing and discharging point and a safety valve (a device for preventing the internal pressure of a pile box body from being too high) and the pipeline thereof can be omitted, and the pipeline is simple, has high airtight reliability, simple process and low installation and maintenance cost.

The pressure control device with the safety explosion-proof ventilation valve has explosion-proof performance and reliability, and the device ensures that the pressure in the box body is not excessively large or small.

It should be understood that, although the terms first, second, etc. may be used in one or more embodiments of the present specification to describe various information, these information should not be limited to these terms, these terms should be used merely to distinguish one from another and should not be used in order or sequence of features described in one or more embodiments of the present specification. Furthermore, the terms "comprises," "comprising," and "includes" are intended to cover a non-exclusive scope, e.g., a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to the details of those steps or modules, but may include inherent elements not expressly listed for such steps or modules.

Claims (6)

1. The pressure control device for the fuel cell is characterized in that the fuel cell stack is arranged in a sealed box body (3), and a purging inlet (1) and a purging outlet are formed in the sealed box body (3); the purging outlet is connected with a safe explosion-proof ventilation valve (2); the air outlet of the sealing box body (3) is connected with a humidifier (4), the humidifier (4) is connected with a throttle valve (5), and the throttle valve is connected with a system mixing and discharging point.

2. A pressure control device for a fuel cell according to claim 1, characterized in that the safety explosion-proof vent is mounted directly on the tank or on a pipe connected to the purge outlet on the sealed tank (3).

3. A pressure control device for a fuel cell according to claim 1, characterized in that the purge inlet (1) is provided on the front end plate of the seal box (3).

4. A pressure control device for a fuel cell according to claim 1, characterized in that the purge outlet is provided on the rear end plate of the seal case (3).

5. A pressure control device for a fuel cell according to claim 1 or 3, characterized in that the number of purge inlets (1) is 4 to 6.

6. The pressure control device for a fuel cell according to claim 1 or 4, wherein the number of purge outlets is 4 to 6.