Composite common end plate of hydrogen energy electric pile

Abstract

The utility model discloses a hydrogen energy electric pile composite common end plate which comprises an aluminum alloy outer plate and a plastic insulation inner plate, a T-shaped groove is formed in the inner side face of the aluminum alloy outer plate, and the plastic insulation inner plate is embedded into the aluminum alloy outer plate in an injection molding mode so that the plastic insulation inner plate and the aluminum alloy outer plate can be connected into a whole. The plastic insulating inner plate adopts T-shaped connection penetrating into the aluminum alloy outer plate without using a sealing ring, so that the T-shaped structure can tighten the plastic insulating inner plate and the aluminum alloy outer plate under the action of plastic contractility to play a sealing role, the sealing ring does not need to be used, materials are saved, the cost is reduced, gaps can be prevented from being generated at the edges of the plastic insulating inner plate and the aluminum plate, and the service life of the aluminum plate is prolonged. And the current leakage or short circuit safety risk is caused.

Description

Technical Field

[0001] The present application belongs to the field of fuel cells, and in particular, relates to a composite common end plate for a hydrogen energy stack. Background Art

[0002] A fuel cell is a device that uses chemical energy to directly convert fuel into electrical energy. It is similar to a battery, but unlike traditional batteries that need to be charged and then release the stored electrical energy, a fuel cell can continuously generate electrical energy under the condition of continuous supply of fuel and oxygen. Fuel cells can use a variety of fuels, such as hydrogen, methanol, natural gas, etc. Among them, hydrogen is one of the most commonly used fuels because it only produces water in the oxidation reaction of hydrogen and no pollutants are emitted. It has been continuously promoted and developed in practical applications.

[0003] As one of the important components of the fuel cell stack, the fuel cell end plate needs to assume both the functions of conductivity and insulation. The electrode reaction zone is usually made of metal material with good conductivity. However, due to the electrochemical reaction and the presence of moisture inside the fuel cell, the end plate may be exposed to a humid environment, so it is necessary to ensure its electrical insulation performance. To achieve this, a layer of insulating plastic material is usually set on the surface of the electrode reaction zone, which can prevent the current from passing through the metal material of the end plate and reduce the risk of current leakage and short circuit. In order to ensure the sealing between the electrode reaction zone and the insulating plastic material, prevent hydrogen or oxygen from leaking in the electrode reaction zone, and prevent the moisture generated in the fuel cell from leaking through the defects or leakage points of the insulating plastic, the existing method generally achieves sealing reliability by adding a sealing ring at the installation interface between the insulating plate and the metal plate. However, in a low temperature environment, the sealing ring or the plastic insulating plate may shrink, thereby destroying the sealing of the electrode reaction zone. The electrode reaction zone may leak current or short circuit, which reduces the efficiency of the fuel cell system, wastes fuel, and poses safety risks. Utility Model Content

[0004] The utility model provides a hydrogen energy stack composite common end plate, which is used to solve the problem that the common end plate of the fuel cell uses a sealing ring to seal the insulating plate and the metal plate, which is easy to damage the sealing reliability due to the shrinkage of the sealing ring in a low temperature environment.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A composite common end plate for a hydrogen energy stack comprises an aluminum alloy outer plate and a plastic insulating inner plate, wherein the inner side surface of the aluminum alloy outer plate is provided with a T-shaped groove, and the aluminum alloy outer plate and the plastic insulating inner plate are integrally formed by injection molding, so that the plastic insulating inner plate forms a T-shaped protrusion embedded in the T-shaped groove, and the T-shaped protrusion made of plastic material can tighten the T-shaped groove under a contraction force to achieve sealing of the gap between the plastic insulating inner plate and the aluminum alloy outer plate.

[0007] The hydrogen energy stack composite common end plate of the utility model is composed of an aluminum alloy outer plate and a plastic insulating inner plate. The aluminum alloy is light in weight and meets the requirements of lightweight, while also ensuring the strength of the end plate and the firmness of installation. The insulating plate of the plastic part has natural insulation, toughness, and lightweight. The advantages of the two materials are utilized to well meet the product requirements. The plastic insulating inner plate is embedded in the aluminum alloy outer plate by injection molding so that the two are connected as one. By providing a T-slot in the aluminum alloy outer plate, the plastic insulating inner plate adopts a T-connection method that penetrates into the aluminum alloy outer plate without using a sealing ring. In this way, the T-structure will tighten the two under the action of the plastic contraction force to play a sealing role. There is no need to use a sealing ring, thus saving materials and reducing costs. It can avoid the generation of gaps at the edges of the plastic insulating inner plate and the aluminum plate, which may lead to current leakage or short circuit safety risks.

[0008] In a preferred implementation, the T-shaped groove is a closed groove connected end to end, and the contour of the closed groove is the same as the shape of the plastic insulating inner plate.

[0009] The closed grooves connected end to end can provide a completely closed environment to prevent liquid or gas from leaking from the connection points or edges of the grooves. The contour shape of the closed groove is the same as the shape of the plastic insulating inner plate to provide higher strength and stability.

[0010] In a preferred implementation, the aluminum alloy outer plate is provided with a flow channel through hole, and the flow channel through hole is opened in the aluminum alloy outer plate portion in the closed groove.

[0011] In a preferred implementation, a step surface is provided in the flow channel through hole, and the step surface is arranged close to the outer side surface of the aluminum alloy outer plate. The edge position of the step surface extends toward the outer side surface to form a boss. The height of the boss is lower than the plane where the outer side surface of the aluminum alloy outer plate is located. A slot is formed between the boss, the step surface and the inner wall of the flow channel through hole. The plastic insulating inner plate forms a plug-in portion that is adapted to the shape of the plug-in portion. After the plug-in portion is inserted into the plug-in portion, it is flush with the outer side surface of the aluminum alloy outer plate.

[0012] The plug-in part and the slot are connected by tightly nesting, so that the connection point is completely closed, thereby achieving higher sealing performance. Moreover, since this plug-in connection has a strong connection force and a tight fit, it can withstand higher pressure. It is very suitable for flow channel through holes that need to withstand high pressure or negative pressure, and can maintain a stable seal.

[0013] In a preferred implementation, a rectangular groove is provided on the interlocking portion flush with the outer side surface of the aluminum alloy outer plate, so that the cross-sectional shape of the interlocking portion is H-shaped.

[0014] In a preferred implementation, an inner groove is further provided on the outer side surface of the aluminum alloy outer plate, the bottom surface of the inner groove is an inclined surface, and the flow channel through hole is located at the lower end of the inclined surface.

[0015] The inclined surface can guide the fluid to flow along the inclined surface, thereby realizing the fluid's flow diversion function. This design can improve the movement efficiency of the fluid inside the battery stack, make the fluid flow more evenly, reduce the resistance to fluid flow, and improve the working efficiency of the battery stack.

[0016] In a preferred implementation, the inclined surface is provided with a plurality of sink grooves.

[0017] By opening small grooves on the inclined surface, it can help balance the pressure, make the fluid more evenly distributed inside the battery stack, and reduce the adverse effects of pressure differences.

[0018] In a preferred implementation, the plastic insulating inner panel is made of high-strength flame-retardant plastic.

[0019] The above structure has the following beneficial effects:

[0020] 1. By opening a T-groove on the aluminum alloy outer plate, the plastic insulating inner plate adopts a T-connection method that penetrates into the aluminum alloy outer plate without using a sealing ring. In this way, the T-structure will tighten the two under the action of the plastic contraction force to play a sealing role. There is no need to use a sealing ring, saving materials and reducing costs. It can avoid the gap between the plastic insulating inner plate and the edge of the aluminum plate, which may cause current leakage or short circuit safety risks. The T-groove is a closed groove connected from end to end. The closed groove connected from end to end can provide a completely closed environment to prevent liquid or gas from leaking from the connection point or edge of the groove.

[0021] 2. The inclined surface connected to the flow channel through hole on the common end plate of the battery stack serves as a flow guide. The inclined surface can guide the fluid to flow along the inclined surface, thereby realizing the fluid diversion function. This design can improve the movement efficiency of the fluid inside the battery stack, make the fluid flow more evenly, reduce the resistance to fluid flow, and improve the working efficiency of the battery stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 A schematic structural diagram of a schematic implementation of a composite common end plate of a hydrogen energy stack of the present application is depicted from one perspective;

[0024] Figure 2 This application is shown Figure 1 A schematic cross-sectional structure diagram of AA;

[0025] Figure 3 This application is shown Figure 2 A schematic diagram of an enlarged structure of a schematic implementation method of part A;

[0026] Figure 4 A schematic structural diagram of another embodiment of the composite common end plate of the hydrogen energy stack of the present application is depicted;

[0027] Figure 5 A schematic diagram of the three-dimensional structure of a schematic implementation scheme of a composite common end plate of a hydrogen energy stack of the present application is depicted;

[0028] Description of labels:

[0029] 1-aluminum alloy outer plate; 10-T-shaped groove; 11-flow channel through hole; 110-pair of slots; 12-inner groove; 120-sunk groove; 2-plastic insulation inner plate; 20-T-shaped protrusion; 21-pair of plug-in parts; 210-rectangular groove. DETAILED DESCRIPTION

[0030] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are considered to be illustrative and non-restrictive in nature.

[0031] In the description of the present invention, it is necessary to understand that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the present invention, unless otherwise clearly specified and limited, a first feature being "upper" or "lower" than a second feature may be the first and second features directly contacting, or the first and second features indirectly contacting through an intermediate medium.

[0032] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through an intermediate structure, but are connected to form a whole only through a connecting structure. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0033] In the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0034] The utility model is described below in conjunction with the accompanying drawings.

[0035] The specific plans adopted are:

[0036] like Figure 1-5 As shown, the utility model provides a composite common end plate for a hydrogen energy stack, comprising an aluminum alloy outer plate 1 and a plastic insulating inner plate 2, the inner side of the aluminum alloy outer plate 1 is provided with a T-shaped groove 10, the aluminum alloy outer plate 1 and the plastic insulating inner plate 2 are integrally formed by injection molding, so that the plastic insulating inner plate 2 forms a T-shaped protrusion 20 embedded in the T-shaped groove 10, and the T-shaped protrusion 20 made of plastic material can tighten the T-shaped groove 10 under the contraction force to achieve the sealing of the gap between the plastic insulating inner plate 2 and the aluminum alloy outer plate 1.

[0037] The hydrogen energy stack composite common end plate of the present application is composed of an aluminum alloy outer plate 1 and a plastic insulating inner plate 2. The aluminum alloy is light in weight and meets the requirements of lightweight, while also ensuring the strength of the end plate and the firmness of installation. The insulating plate of the plastic part has natural insulation, toughness, and lightweight. The advantages of the two materials are used to meet the product requirements well. The plastic insulating inner plate 2 is embedded in the aluminum alloy outer plate 1 by injection molding to connect the two as one. By opening a T-slot in the aluminum alloy outer plate 1, the plastic insulating inner plate 2 adopts a T-type connection method that penetrates into the aluminum alloy outer plate 1 without using a sealing ring. In this way, the T-type structure will tighten the two under the action of the plastic shrinkage force to play a sealing role. There is no need to use a sealing ring, which saves materials and reduces costs. It can avoid the formation of gaps between the plastic insulating inner plate 2 and the edge of the aluminum plate, which may lead to current leakage or short circuit safety risks.

[0038] As a preferred embodiment of the present application, see Figure 3 The T-shaped groove 10 is a closed groove connected end to end, and the contour of the closed groove is the same as the shape of the plastic insulating inner plate 2.

[0039] The closed grooves connected end to end can provide a completely closed environment to prevent liquid or gas from leaking from the connection points or edges of the grooves. The contour shape of the closed groove is the same as the shape of the plastic insulating inner plate 2, which can provide higher strength and stability. Figure 1 , since the shapes of the aluminum alloy outer plate 1 and the plastic insulating inner plate 2 match, the closed groove can better withstand external forces and deformation, which can reduce the distortion and deformation of the structure and improve the sealing reliability.

[0040] For further information, see Figure 1 The aluminum alloy outer plate 1 is provided with a flow channel through hole 11, and the flow channel through hole 11 is opened in the part of the aluminum alloy outer plate 1 in the closed groove. It can be understood by those skilled in the art that the flow channel through hole 11 usually corresponds to the fuel cell assembly in the fuel cell stack to form a gas channel to guide the hydrogen or oxygen gas to the correct position.

[0041] In order to ensure the sealing between the plastic insulation board and the inner side of the aluminum alloy outer plate 1, see Figure 3 In the present embodiment, a step surface is provided in the flow channel through hole 11, and the step surface is arranged close to the outer side surface of the aluminum alloy outer plate 1. The edge position of the step surface extends toward the outer side surface to form a boss. The height of the boss is lower than the plane where the outer side surface of the aluminum alloy outer plate 1 is located. A slot 110 is formed between the boss, the step surface and the inner wall of the flow channel through hole 11. The plastic insulating inner plate 2 forms a plug-in portion 21 that is adapted to the shape of the plug-in portion 110. After the plug-in portion 21 is inserted into the plug-in portion 110, it is flush with the outer side surface of the aluminum alloy outer plate 1.

[0042] The plug-in portion 21 and the slot 110 are connected by tightly nesting, so that the connection point is completely closed, thereby achieving a higher sealing performance. Moreover, since this plug-in connection has a strong connection force and a tight fit, it can withstand higher pressures. It is very suitable for the flow channel through hole 11 that needs to withstand high pressure or negative pressure, and can maintain a stable seal.

[0043] As a preferred solution under this embodiment, a rectangular groove 210 is provided on the same plane as the outer side surface of the inserting portion 21 and the aluminum alloy outer plate 1, so that the cross-sectional shape of the inserting portion 21 is H-shaped. After being installed in conjunction with the battery stack assembly of the battery stack, an H-shaped sealing strip effect can be formed. The H-shaped structure enables the sealing strip to provide good elasticity and sealing performance when compressed or stretched, and can effectively prevent liquid and gas from leaking or penetrating from the connection point.

[0044] In order to improve the movement efficiency of the fluid inside the fuel cell stack, an inner groove 12 is further provided on the outer side of the aluminum alloy outer plate 1. The bottom surface of the inner groove 12 is an inclined surface, and the flow channel through hole 11 is located at the lower end of the inclined surface.

[0045] The inclined surface connected to the flow channel through hole 11 on the common end plate of the battery stack serves as a flow guide. The inclined surface can guide the fluid to flow along the inclined surface, thereby realizing the fluid diversion function. This design can improve the movement efficiency of the fluid inside the battery stack, make the fluid flow more evenly, reduce the resistance to fluid flow, and improve the working efficiency of the battery stack.

[0046] Furthermore, the inclined surface is provided with a plurality of sink grooves 120. In the battery stack, the pressure difference in different areas may cause uneven fluid flow or resistance change, affecting the performance of the battery stack. By providing small sink grooves 120 on the inclined surface, it can help balance the pressure, make the fluid more evenly distributed inside the battery stack, and reduce the adverse effects of the pressure difference.

[0047] As a preferred embodiment of the present application, the plastic insulating inner panel 2 is made of high-strength flame-retardant plastic.

[0048] High flame retardant insulation board has good electrical insulation performance, can effectively prevent the conduction of current, and provide good electrical insulation protection. It is usually made of lightweight materials, has a low specific gravity, can reduce the weight of the battery stack, has good durability and anti-aging ability, and can maintain good insulation performance and mechanical strength during long-term use.

[0049] The parts not described in the present invention can be realized by adopting or drawing on the existing technology.

[0050] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A composite common end plate for a hydrogen energy stack, comprising an aluminum alloy outer plate and a plastic insulating inner plate, characterized in that: The inner side surface of the aluminum alloy outer plate is provided with a T-shaped groove. The aluminum alloy outer plate and the plastic insulating inner plate are integrally formed by injection molding, so that the plastic insulating inner plate forms a T-shaped protrusion embedded in the T-shaped groove. The T-shaped protrusion made of plastic material can tighten the T-shaped groove under the contraction force to achieve the sealing of the gap between the plastic insulating inner plate and the aluminum alloy outer plate.

2. A hydrogen energy stack composite common end plate according to claim 1, characterized in that: The T-shaped groove is a closed groove connected end to end, and the contour of the closed groove is the same as the shape of the plastic insulating inner plate.

3. A hydrogen energy stack composite common end plate according to claim 2, characterized in that: The aluminum alloy outer plate is provided with a flow channel through hole, and the flow channel through hole is opened in the aluminum alloy outer plate part in the closed groove.

4. A hydrogen energy stack composite common end plate according to claim 3, characterized in that: A step surface is provided in the flow channel through hole, and the step surface is arranged close to the outer side surface of the aluminum alloy outer plate. The edge position of the step surface extends toward the outer side surface to form a boss. The height of the boss is lower than the plane where the outer side surface of the aluminum alloy outer plate is located. A slot is formed between the boss, the step surface and the inner wall of the flow channel through hole. The plastic insulating inner plate forms a plug-in portion that is adapted to the shape of the plug-in portion. After the plug-in portion is inserted into the plug-in portion, it is flush with the outer side surface of the aluminum alloy outer plate.

5. A hydrogen energy stack composite common end plate according to claim 4, characterized in that: The inserting portion is flush with the outer side surface of the aluminum alloy outer plate and is provided with a rectangular groove, so that the cross-sectional shape of the inserting portion is H-shaped.

6. A hydrogen energy stack composite common end plate according to claim 3, characterized in that: An inner groove is also provided on the outer side surface of the aluminum alloy outer plate, the bottom surface of the inner groove is an inclined surface, and the flow channel through hole is located at the lower end of the inclined surface.

7. A hydrogen energy stack composite common end plate according to claim 6, characterized in that: The inclined surface is provided with a plurality of sinking grooves.

8. The composite common end plate of a hydrogen energy stack according to claim 1, characterized in that: The plastic insulating inner plate is made of high-strength flame-retardant plastic.

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