A fuel cell stack packaging box and purge device

Abstract

The present invention provides a fuel cell stack packaging box and a purge device, comprising a box body, an insulating support plate assembly, an exhaust valve, a hydrogen concentration detection unit, a purge unit, a purge bamboo joint and a drainage bamboo joint; the box body is provided with a purge inlet, an outlet, a drainage outlet, an inclined drainage groove and a mounting hole; the insulating support plate assembly is provided with a drainage channel, and the purge unit comprises a purge distribution block, a quick-plug connector, a purge main pipe and a branch pipe, which have significant beneficial effects, can efficiently discharge hydrogen and water vapor, avoid local accumulation, and improve safety and insulation reliability; precise purge gas distribution ensures that there is sufficient gas volume for purging at specific locations; the exhaust valve and the hydrogen concentration detection unit ensure safety, the independent purge unit can optimize assembly production, the graphene ceramic special insulation layer enhances insulation, and the components are standard parts, and no separate customization and processing is required, thereby reducing production costs.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell technology, and in particular to a fuel cell stack packaging box and a purge device. Background Art

[0002] Fuel cells are a clean energy technology that converts chemical energy directly into electrical energy. They have the advantages of high energy conversion efficiency, simple structure, low emissions, and low noise. They are often used in the power systems of vehicles, ships, and other vehicles, and can also be used as mobile or fixed power stations.

[0003] Fuel cells are generally composed of dozens to hundreds of bipolar plates and membrane electrodes stacked in sequence. A certain pre-tightening force is provided by a press, and then the fuel cell stack is obtained by fastening with screws or bands. The airtightness between the bipolar plates and the membrane electrodes is ensured by sealing glue lines. When the fuel cell is running at high temperature, a small amount of hydrogen and water vapor will leak, resulting in a high temperature and high humidity environment inside the packaging box. On the one hand, due to the accumulation of leaked hydrogen, there is a risk of explosion. On the other hand, due to the condensation of water vapor, the insulation of the fuel cell will be reduced. Therefore, it is necessary to use dry air from the outside to purge the inside of the fuel cell packaging box to discharge the hydrogen and water vapor inside the packaging box to the outside of the box.

[0004] Although the existing technology also purges the inside of the fuel cell packaging box, the internal core and some supporting components of the fuel cell will form a local closed area, which is not conducive to the discharge of internal leaked gas. Water vapor may gather in local dead corners and further condense into small water droplets, affecting the insulation of the fuel cell. Some airflow guiding structures or drainage structures will also be made on the box, but the airflow guiding properties are not strong, and relying on non-directional diffusion, the leaked gas inside the fuel cell cannot be effectively discharged. Summary of the invention

[0005] According to the above-mentioned technical problem of incomplete purge inside the fuel cell packaging box, a fuel cell stack packaging box and a purge device are provided. The device of the present invention improves the guidance of the purge gas inside the fuel cell by setting a specific purge port on the box body, so that a specific position has sufficient gas volume for purge, and the leaked gas inside the fuel cell is discharged in time, thereby improving the safety and insulation of the fuel cell.

[0006] The technical means adopted by the present invention are as follows:

[0007] A fuel cell stack packaging box and a purge device, comprising: a box body, an insulating support plate assembly, an exhaust valve, a hydrogen concentration detection unit, a purge unit, a purge bamboo joint, and a drainage bamboo joint;

[0008] The side wall of the box is provided with a purge inlet and a purge outlet, the bottom plate of the box is provided with a drainage outlet, the inside of the box is provided with an inclined drainage groove, and the side wall of the box is provided with a mounting hole for installing an exhaust valve and a mounting hole for installing a hydrogen concentration detection unit;

[0009] The insulating support plate assembly is provided with a drainage channel;

[0010] The purge unit comprises a purge distribution block, a quick-connect connector, a purge main pipe and a purge branch pipe;

[0011] A special graphene ceramic insulating layer is prepared inside the box.

[0012] Furthermore, the insulating support plate combination is made of high-density silicone rubber or PA insulating material, and 2-4 insulating support plate combinations are provided at the bottom of the box, and a single insulating support plate is provided with 5-8 drainage channels.

[0013] Furthermore, the diameter of the purge main pipe is 1.5-3 times the diameter of the purge branch pipe, and the purge distribution block is provided with 7 threaded interfaces, one interface is connected to the purge main pipe, and the remaining 6 interfaces are connected to the purge branch pipes.

[0014] Furthermore, the purge branch pipes at the bottom of the box are distributed according to the combined layout of the insulating support plates to ensure that there is a purge branch pipe in each relatively independent space;

[0015] Two insulating support plate assemblies are provided at the bottom, and the purge branch pipes are arranged according to the left, middle and right positions.

[0016] Furthermore, a purge branch pipe is arranged above the core, including purge branches located near the low-voltage wiring harness, near the high-voltage copper busbar and in the center above the core, and the purge branch pipes are all located on the blind end side of the fuel cell, with the air outlet facing the gas outlet end side of the fuel cell.

[0017] Furthermore, the slope of the drainage trough is 0.5-2°, with the lower side being closer to the drainage outlet.

[0018] Furthermore, the number of the exhaust valves is determined based on the residual volume inside the fuel cell and is installed on the side wall of the box. When the air pressure inside the box abnormally rises to a critical value of the exhaust valve, the exhaust valve's breathable membrane ruptures to exhaust air.

[0019] Furthermore, the hydrogen concentration detection unit is installed on the side wall of the box body, and is used to monitor the concentration of leaked hydrogen in the box body in real time, and adjust the purge gas volume through an external control unit to ensure that the hydrogen leakage concentration is lower than the design value.

[0020] Due to the adoption of the above technical solution, compared with the prior art, the present invention has the following advantages:

[0021] 1. The present invention provides a fuel cell stack packaging box and a purge device. The inclined drainage groove inside the box and the drainage channel design on the insulating support plate assembly, combined with the work of the purge unit, can effectively discharge the hydrogen and water vapor leaked from the packaging box to the outside of the fuel cell. The slope of the drainage groove is 0.5-2°, which can make the condensed water droplets flow smoothly to the drainage outlet under the action of gravity, and the multiple drainage channels on the insulating support plate assembly can further guide the water vapor to be discharged, avoiding local dead corners and improving the safety and insulation reliability of the fuel cell.

[0022] 2. The present invention provides a fuel cell stack packaging box and a purge device, in which the purge distribution block in the purge unit divides the purge gas into "1 to 6", and the diameter of the purge main pipe and the diameter of the purge branch pipe are designed in a reasonable ratio, so that the purge gas entering the packaging box can be evenly distributed to each area; for example, purge branches are arranged at different key positions above the core, including near the low-pressure wiring harness, near the high-pressure copper busbar and in the central position, to ensure that sufficient gas is available for purging at specific positions, thereby improving the guidance of the purge gas inside the fuel cell and making the purge more comprehensive and efficient.

[0023] 3. The present invention provides a fuel cell stack packaging box and purge device, in which the exhaust valve can be reasonably installed according to the residual volume inside the fuel cell. When the air pressure inside the box abnormally rises to a critical value, the air permeable membrane of the exhaust valve ruptures to quickly exhaust the air, thereby avoiding damage to the fuel cell packaging box caused by excessive air pressure. At the same time, the hydrogen concentration detection unit monitors the leaked hydrogen concentration in real time, and adjusts the purge gas volume through the external control unit to ensure that the hydrogen leakage concentration is lower than the design value. The combined effect of the two greatly improves the safety of the fuel cell.

[0024] 4. The present invention provides a fuel cell stack packaging box and a purge device. The purge unit is an independent component that can be assembled separately and then installed on the packaging box. This modular design saves the assembly time of the entire fuel cell stack and improves production efficiency.

[0025] 5. The present invention provides a fuel cell stack packaging box and a purge device. The graphene ceramic special insulation layer prepared inside the box effectively enhances the insulation performance of the packaging box, reduces the risk of failure due to insulation problems, and further improves the overall performance and stability of the fuel cell.

[0026] Based on the above reasons, the present invention can be widely promoted in the field of compressor equipment technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0028] Figure 1 It is a front view schematic diagram of a fuel cell stack packaging box and a purge device packaging box according to the present invention;

[0029] Figure 2 It is a schematic diagram of the reverse side of a fuel cell stack packaging box and a purge device packaging box according to the present invention;

[0030] Figure 3 It is a schematic diagram of a fuel cell stack packaging box and an insulating support plate of a purge device according to the present invention;

[0031] Figure 4 This is a cross-sectional view of the AA section of a fuel cell stack packaging box and an insulating support plate of a purge device according to the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the drainage groove of a fuel cell stack packaging box and a purge device packaging box according to the present invention;

[0033] Figure 6 It is a cross-sectional view of the drainage groove BB of a fuel cell stack packaging box and a purge device packaging box according to the present invention;

[0034] Figure 7 It is a schematic diagram of the side of a fuel cell stack packaging box and a purge device packaging box according to the present invention;

[0035] Figure 8 It is a schematic diagram of the bottom of a fuel cell stack packaging box and a purge device packaging box according to the present invention;

[0036] Fig. 9 It is a schematic diagram of the structure of a fuel cell stack packaging box and a purge unit of a purge device described in the present invention.

[0037] In the figure: 1. Packaging box; 2. Insulation support plate assembly; 3. Exhaust valve; 4. Hydrogen concentration detection unit; 5. Purge unit; 6. Purge bamboo joint; 7. Drainage bamboo joint; 1-1. Purge inlet; 1-2. Purge outlet; 1-3. Drainage outlet; 1-4. Drainage trough; 1-5. Exhaust valve mounting hole; 2-1. Drainage channel; 5-1. Purge distribution block; 5-2. Quick connector; 5-3. Purge main pipe; 5-4. Purge branch pipe. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0042] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0045] Example 1

[0046] like Figures 1 to 9 As shown, a fuel cell packaging box and a purge device of the present invention mainly include a box body 1, an insulating support plate assembly 2, an exhaust valve 3, a hydrogen concentration detection unit 4, a purge unit 5, a purge bamboo node 6, and a drainage bamboo node 7.

[0047] In order to keep a certain distance between the fuel cell core and the packaging box and to support the core, 2-4 insulating support plate assemblies 2 are provided at the bottom of the packaging box. The material can be made of insulating materials such as high-density silicone rubber or PA. The insulating support plate assembly 2, the packaging box 1, and the core form a relatively closed space. The space is relatively independent and the accumulated gas is not easy to be discharged. Therefore, a drainage channel is provided on the insulating plate, such as Figure 3 As shown, a single insulating support plate may be provided with 5 to 8 drainage channels, which is beneficial for the purge gas to carry out water vapor.

[0048] A purge bamboo joint 6 is installed at the purge inlet 1-1 of the packaging box 1. The purge gas passes through the purge inlet bamboo joint 6 and enters the purge main pipe 5-3, and then is connected to the purge distribution block 5-1 through the quick-plug connector 5-2. Seven threaded interfaces are provided on the purge distribution block 5-1, one interface is connected to the purge main pipe 5-3, and the remaining six threaded interfaces are connected to the purge branch pipe 5-4. The diameter of the purge main pipe 5-3 is approximately 1.5-3 times the diameter of the purge branch pipe 5-4. The purge gas entering the packaging box is divided into six paths through the purge distribution block 5-1. The corresponding area will be fully purged through the guidance of the purge branch pipe 5-4.

[0049] Due to the layout of the insulating support plate assembly 2, the distribution of the purge branch pipe 5-4 at the bottom of the packaging box 1 must ensure that there is a purge branch pipe 5-4 in each relatively independent space to avoid the formation of a local closed space where the accumulated gas or water droplets cannot be discharged. If two insulating support plate assemblies 2 are provided at the bottom, the purge branch pipe 5-4 is arranged according to the left, middle and right positions.

[0050] Since leaked hydrogen can easily gather above the core, a purge branch pipe 5-4 is set above the core, one of which is located near the low-pressure wire harness and the other near the high-pressure copper bus. In order to prevent hydrogen from gathering in the middle, a purge branch pipe 5-4 is also required to be set in the center above the core. The purge branch pipes 5-4 are all located on the blind end side of the fuel cell, and the gas outlet faces the gas inlet end side of the fuel cell.

[0051] A purge outlet 1-2 is provided on the side wall of the packaging box near the gas port end, and a drainage outlet 1-3 is provided on the bottom of the packaging box near the gas port end. The leaked hydrogen in the packaging box is purged by the purge branch pipe 5-4 and gathered near the purge outlet 1-2, and discharged to the outside of the fuel cell through the pipeline connected to the purge bamboo node 6. The condensed water droplets in the packaging box are purged by the purge branch pipe 5-4 and gathered in the drainage groove 1-4 of the packaging box. The drainage groove 1-4 is provided with a slope, and the slope X is set to about 0.5-2°. The side close to the drainage outlet 1-3 is the lower side, and is discharged to the outside of the fuel cell through the pipeline connected to the drainage bamboo node 7.

[0052] In summary, the "1-to-6" purge pipeline design of the purge unit 5 can effectively discharge the hydrogen and water vapor leaked from the packaging box to the outside of the fuel cell without causing local dead corner accumulation, thereby improving the safety and insulation reliability of the fuel cell. At the same time, as an independent component, the purge unit 5 can be assembled into components separately and then assembled on the packaging box, saving the assembly time of the entire fuel cell stack and improving production efficiency.

[0053] Example 2

[0054] On the basis of Example 1, an exhaust valve 3 is installed on the side wall of the packaging box 1. The number of exhaust valves can be calculated according to the residual volume inside the fuel cell. In this embodiment, two exhaust valves 3 are installed, which are respectively located on the two side walls of the packaging box 1. When the air pressure inside the packaging box 1 increases abnormally and reaches the critical value of the exhaust valve 3, the air permeable membrane of the exhaust valve 3 ruptures, so that the gas can be quickly discharged to avoid damage to the fuel cell packaging box. A hydrogen concentration detection unit 4 is installed on the side wall of the packaging box 1, and the leakage hydrogen concentration in the packaging box 1 can be monitored in real time. The purge gas volume is adjusted by an external control unit to ensure that the hydrogen leakage concentration is lower than the design value, thereby improving the safety of the fuel cell.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel cell stack packaging box and a purge device, characterized in that: include: Box body, insulating support plate assembly, exhaust valve, hydrogen concentration detection unit, purge unit, purge bamboo joint, drainage bamboo joint; The side wall of the box is provided with a purge inlet and a purge outlet, the bottom plate of the box is provided with a drainage outlet, the inside of the box is provided with an inclined drainage groove, and the side wall of the box is provided with a mounting hole for installing an exhaust valve and a mounting hole for installing a hydrogen concentration detection unit; The insulating support plate assembly is provided with a drainage channel; The purge unit comprises a purge distribution block, a quick-connect connector, a purge main pipe and a purge branch pipe; A special graphene ceramic insulating layer is prepared inside the box.

2. A fuel cell stack packaging box and purge device according to claim 1, characterized in that: The insulating support plate combination is made of high-density silicone rubber or PA insulating material. The insulating support plate combination is provided at 2-4 locations at the bottom of the box body, and a single insulating support plate is provided with 5-8 drainage channels.

3. A fuel cell stack packaging box and purge device according to claim 1, characterized in that: The diameter of the purge main pipe is 1.5-3 times the diameter of the purge branch pipe. The purge distribution block is provided with 7 threaded interfaces, one interface is connected to the purge main pipe, and the remaining 6 interfaces are connected to the purge branch pipes.

4. A fuel cell stack packaging box and purge device according to claim 1, characterized in that: The purge branch pipes at the bottom of the box are distributed according to the combined layout of the insulating support plate to ensure that there is a purge branch pipe in each relatively independent space; Two insulating support plate assemblies are provided at the bottom, and the purge branch pipes are arranged according to the left, middle and right positions.

5. A fuel cell stack packaging box and purge device according to claim 1, characterized in that: Purge branches are arranged above the core, including purge branches located near the low-voltage wiring harness, near the high-voltage copper busbar and in the center above the core. The purge branches are all located on the blind end side of the fuel cell, with the gas outlet facing the gas inlet end side of the fuel cell.

6. A fuel cell stack packaging box and purge device according to claim 1, characterized in that: The slope of the drainage trough is 0.5-2°, and the lower side is closer to the drainage outlet.

7. A fuel cell stack packaging box and purge device according to claim 1, characterized in that: The number of the exhaust valves is determined by calculation based on the residual volume inside the fuel cell and is installed on the side wall of the box. When the air pressure inside the box abnormally rises and reaches the critical value of the exhaust valve, the air permeable membrane of the exhaust valve ruptures to exhaust air.

8. A fuel cell stack packaging box and purge device according to claim 1, characterized in that: The hydrogen concentration detection unit is installed on the side wall of the box body, and is used to monitor the concentration of leaked hydrogen in the box body in real time, and adjust the purge gas volume through an external control unit to ensure that the hydrogen leakage concentration is lower than the design value.

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