Current collecting mechanism and fuel cell system

Abstract

The application provides a current collecting mechanism and a fuel cell system, and relates to the technical field of fuel cells.The current collecting mechanism comprises a current collecting plate body, and the inside of the current collecting plate body is provided with a current collecting plate hydrogen inlet cavity, a current collecting plate hydrogen outlet cavity, a current collecting plate cooling liquid inlet cavity and a current collecting plate cooling liquid outlet cavity; the surface of the current collecting plate body is provided with at least a hydrogen inlet communicating with the current collecting plate hydrogen inlet cavity, a cooling liquid inlet communicating with the current collecting plate cooling liquid inlet cavity and a cooling liquid outlet communicating with the current collecting plate cooling liquid outlet cavity; the hydrogen in the current collecting plate hydrogen inlet cavity and the medium in the current collecting plate cooling liquid outlet cavity can exchange heat, so that the hydrogen flowing through the current collecting plate hydrogen inlet cavity is heated. The fuel cell system comprises the current collecting mechanism. The technical problem that the assembly of the fuel cell system is relatively complex in the prior art is solved, and the technical effect that the assembly of the fuel cell system is simplified is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell, in particular to a current collection mechanism and a fuel cell system. BACKGROUND

[0002] The fuel cell stack is a place where hydrogen and oxygen occur electrochemical reaction, its main function is to generate electricity through electrochemical reaction, and the product is water. The fuel cell stack is composed of a certain number of single cells stacked and sealed, and the internal structure of the single cell is: bipolar plate-gas diffusion layer-catalyst layer-membrane electrode-catalyst layer-diffusion layer-bipolar plate, which is sealed by a sealing ring. In the working process of the fuel cell stack, the pressurized air and hydrogen provided by the air compressor and the hydrogen tank occur electrochemical reaction in the fuel cell stack to generate electricity and water. Since the electrochemical reaction in the fuel cell stack is carried out on a complex three-phase interface, it is affected by multiple factors such as pressure, temperature and humidity, so controlling the temperature of the gas entering the stack is of great significance to the performance improvement of the fuel cell stack.

[0003] Currently, the preheating of hydrogen entering the fuel cell stack can ensure that the hydrogen at the inlet of the fuel cell stack has a relatively suitable temperature, reduce the temperature and energy fluctuation of the hydrogen heat exchange inside the fuel cell stack, ensure that the air and hydrogen entering the fuel cell stack react directly at a proper temperature, and improve the system working efficiency. At present, heat exchanger equipment is used in the market to improve the temperature of hydrogen by heat exchange between cooling liquid and hydrogen. This method makes the layout space larger and the assembly more complex. SUMMARY

[0004] The purpose of the present application is to provide a current collection mechanism and a fuel cell system to alleviate the technical problem of complex assembly of the fuel cell system in the prior art.

[0005] In a first aspect, the present application provides a current collection mechanism, comprising: a current collection plate body, the inside of the current collection plate body is provided with a current collection plate hydrogen inlet cavity, a current collection plate hydrogen outlet cavity, a current collection plate cooling liquid inlet cavity and a current collection plate cooling liquid outlet cavity; the surface of the current collection plate body is provided with at least a hydrogen inlet communicating with the current collection plate hydrogen inlet cavity, a cooling liquid inlet communicating with the current collection plate cooling liquid inlet cavity and a cooling liquid outlet communicating with the current collection plate cooling liquid outlet cavity.

[0006] The hydrogen in the current collection plate hydrogen inlet cavity and the medium in the current collection plate cooling liquid outlet cavity can exchange heat to heat the hydrogen flowing through the current collection plate hydrogen inlet cavity.

[0007] Further, the inside of the current collection plate hydrogen inlet cavity is provided with a heat exchange member, so that the hydrogen passes through the inside of the heat exchange member.

[0008] The communication cavity is formed at the intersection of the hydrogen inlet cavity of the busbar and the coolant outlet cavity of the busbar, and the hydrogen is heated by the heat exchange element.

[0009] Further, the heat exchange element adopts a hollow tubular structure, which is embedded in the hydrogen inlet cavity of the busbar and has a gap between the inner wall of the hydrogen inlet cavity and the heat exchange element for the coolant to pass through.

[0010] The coolant outlet cavity of the busbar is provided in two sections, which are communicated with the hydrogen inlet cavity of the busbar at different positions.

[0011] Further, the hydrogen outlet cavity of the busbar is internally integrated with a gas-liquid separator.

[0012] Further, the coolant inlet cavity of the busbar is internally integrated with a deionizer.

[0013] Further, the coolant inlet cavity of the busbar has a deionizer dismounting opening, and a deionizer baffle is installed at the deionizer dismounting opening.

[0014] Further, the deionizer baffle is detachably connected to the busbar body, and a sealing structure is arranged therebetween.

[0015] Further, the busbar body is internally provided with a busbar air inlet cavity and a busbar air outlet cavity, and the surface of the busbar body is provided with an air inlet communicated with the busbar air inlet cavity and an air outlet communicated with the busbar air outlet cavity.

[0016] Beneficial effects:

[0017] The busbar body is internally provided with a busbar hydrogen inlet cavity, a busbar hydrogen outlet cavity, a busbar coolant inlet cavity and a busbar coolant outlet cavity; the surface of the busbar body is provided with at least a hydrogen inlet communicated with the busbar hydrogen inlet cavity, a coolant inlet communicated with the busbar coolant inlet cavity and a coolant outlet communicated with the busbar coolant outlet cavity; in the specific assembly, the hydrogen inlet, the coolant inlet and the coolant outlet are directly connected with external components, thereby forming a hydrogen circuit and a coolant circuit; since the hydrogen in the busbar hydrogen inlet cavity and the medium in the busbar coolant outlet cavity can exchange heat, the hydrogen flowing through the busbar hydrogen inlet cavity can absorb heat from the medium in the busbar coolant outlet cavity and be heated, so that the temperature of the hydrogen is increased. By using the busbar, the heat exchange effect can be achieved without external heat exchange equipment, thereby achieving the purpose of heating hydrogen.

[0018] In addition, on the basis of realizing heat exchange, the hydrogen inlet and outlet pipeline and the cooling liquid inlet and outlet pipeline are integrated into the current-converging mechanism, the number of exposed pipelines is reduced, the total number of connecting pipelines in the pipeline is reduced, the current-converging mechanism can be assembled in advance, the complexity of assembly is reduced, the installation time is reduced, the part arrangement space is reduced, and the integration degree is high.

[0019] In a second aspect, the present application provides a fuel cell system, comprising: a stack body and the current-converging mechanism according to any one of the preceding embodiments.

[0020] The stack body is internally provided with a stack hydrogen inlet and outlet cavity and a stack cooling liquid inlet and outlet cavity, the stack hydrogen inlet and outlet cavity communicates the current-converging plate hydrogen inlet cavity with the current-converging plate hydrogen outlet cavity, and the stack cooling liquid inlet and outlet cavity communicates the current-converging plate cooling liquid inlet cavity with the current-converging plate cooling liquid outlet cavity.

[0021] Further, the current-converging plate body and the stack body are both cuboid structures, and are stacked along the width direction.

[0022] Beneficial effects:

[0023] The fuel cell system provided by the present application comprises the current-converging mechanism described above, and therefore the technical advantages and effects that can be achieved by the fuel cell system also include the technical advantages and effects that can be achieved by the current-converging mechanism, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0025] Figure 1 The structural schematic diagram of the current-converging mechanism provided by the embodiments of the present application is shown.

[0026] Figure 2 The structural schematic diagram of the current-converging mechanism capable of showing the internal cavity is one of the structural schematic diagrams.

[0027] Figure 3 The structural schematic diagram of the current-converging mechanism capable of showing the internal cavity is another of the structural schematic diagrams.

[0028] Figure 4 The structural schematic diagram of the second part of the current-converging plate body in the current-converging mechanism is shown.

[0029] Icon:

[0030] 100 - busbar body; 110 - busbar hydrogen inlet cavity; 120 - busbar hydrogen outlet cavity; 130 - busbar coolant inlet cavity; 140 - busbar coolant outlet cavity; 150 - busbar air inlet cavity; 160 - busbar air outlet cavity; 111 - hydrogen inlet; 131 - coolant inlet; 141 - coolant outlet; 151 - air inlet; 152 - air outlet;

[0031] 200 - stack body;

[0032] 300 - heat exchange element;

[0033] 400 - gas-liquid separator; 410 - gas-liquid separator water outlet;

[0034] 500 - deionizer;

[0035] 600 - deionizer baffle. DETAILED DESCRIPTION

[0036] So that the objects, technical solutions and advantages of the embodiments of the present application are more apparent, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0038] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] Furthermore, the terms "horizontal", "vertical", and the like are used as terms of convenience to describe the orientation of components, and do not require the components to be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" merely means more horizontal than "vertical", and does not require the structure to be perfectly horizontal, but can be slightly inclined.

[0041] In the description of the present application, it also needs to be explained that, unless explicitly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following examples and features in the examples can be combined with each other without conflict.

[0043] Referring to Figure 1 and Figure 2 , the present embodiment provides a current collection mechanism, which comprises a current collection plate body 100, and the inside of the current collection plate body 100 is provided with a current collection plate hydrogen inlet cavity 110, a current collection plate hydrogen outlet cavity 120, a current collection plate coolant inlet cavity 130 and a current collection plate coolant outlet cavity 140; the surface of the current collection plate body 100 is provided with at least a hydrogen inlet 111 communicating with the current collection plate hydrogen inlet cavity 110, a coolant inlet 131 communicating with the current collection plate coolant inlet cavity 130 and a coolant outlet 141 communicating with the current collection plate coolant outlet cavity 140; the hydrogen in the current collection plate hydrogen inlet cavity 110 and the medium in the current collection plate coolant outlet cavity 140 can exchange heat to heat the hydrogen flowing through the current collection plate hydrogen inlet cavity 110.

[0044] The current collection mechanism provided in the present embodiment can directly connect the hydrogen inlet 111, the coolant inlet 131 and the coolant outlet 141 with external components during specific assembly, and then form a hydrogen circuit and a coolant circuit; since the hydrogen in the current collection plate hydrogen inlet cavity 110 and the medium in the current collection plate coolant outlet cavity 140 can exchange heat, the hydrogen flowing through the current collection plate hydrogen inlet cavity 110 can absorb heat from the medium in the current collection plate coolant outlet cavity 140 to be heated, so that the temperature of the hydrogen is increased. By using the current collection mechanism, the heat exchange effect can be achieved without external heat exchange equipment, and the purpose of heating hydrogen is achieved.

[0045] In addition, on the basis of heat exchange, the current-converging mechanism integrates the hydrogen inlet and outlet pipelines and the cooling liquid inlet and outlet pipelines into the current-converging mechanism, reduces the number of exposed pipelines, thereby reducing the total number of connecting pipelines in the pipeline, and the current-converging mechanism can be assembled in advance, thereby reducing the complexity of assembly, reducing the installation time, reducing the part arrangement space, and having a high degree of integration.

[0046] It should be noted that, in actual application, the medium in the current-converging plate out cooling liquid cavity 140 of the current-converging mechanism comes from the stack, that is, the cooling liquid after heat exchange with the stack, which absorbs part of the heat of the stack and has a higher temperature than the normal temperature, and when it flows into the current-converging plate out cooling liquid cavity 140, it has a higher temperature than the hydrogen, and since there is a temperature difference between the cooling liquid and the hydrogen, heat exchange can be performed between the two to increase the temperature of the hydrogen. Specifically, refer to Figure 2 and Figure 3 The inside of the current-converging plate in hydrogen cavity 110 is provided with a heat exchange member 300 to pass the hydrogen from the inside of the heat exchange member 300, and the intersection of the current-converging plate in hydrogen cavity 110 and the current-converging plate out cooling liquid cavity 140 forms a communication cavity, and the hydrogen is heated by the heat exchange member 300.

[0047] In this embodiment, in combination with Figure 2 and Figure 3 The heat exchange member 300 adopts a hollow tubular structure, which is embedded in the inside of the current-converging plate in hydrogen cavity 110 and has a gap between the inner wall of the current-converging plate in hydrogen cavity 110 for the cooling liquid to pass through; the current-converging plate out cooling liquid cavity 140 is provided in two sections, which are communicated with the current-converging plate in hydrogen cavity 110 at different positions, so that the cooling liquid can flow from one section of the current-converging plate out cooling liquid cavity 140 into the current-converging plate in hydrogen cavity 110 and exchange heat with the hydrogen in the heat exchange member 300, so that the hydrogen absorbs a certain amount of heat and is heated, and at the same time, the cooling liquid flows out from the other section of the current-converging plate out cooling liquid cavity 140.

[0048] Referring to Figure 1 and Figure 3 The inside of the current-converging plate out hydrogen cavity 120 is integrally provided with a gas-liquid separator 400, the hydrogen flows into the gas-liquid separator 400 through the current-converging plate out hydrogen cavity 120 for gas-liquid separation, and the liquid after gas-liquid separation is discharged through the gas-liquid separator water outlet 410, and the gas after gas-liquid separation can be discharged from the current-converging mechanism.

[0049] Referring to Figure 2The inside of the busbar inlet cooling liquid cavity 130 is integrated with a deionizer 500. In this embodiment, the deionizer 500 of the traditional fuel cell system is integrated into the busbar mechanism to reduce the maintenance cost of the fuel cell system in the later period and improve the system integration. At this time, only the filter element of the deionizer 500 needs to be replaced, which greatly reduces the replacement cost of the deionizer 500. The busbar mechanism can reduce the complexity of the auxiliary parts of the fuel cell system, improve the sealing between the parts of the fuel cell system, improve the integration of the fuel cell system, improve the assembly efficiency of the fuel cell system, reduce the cost of the fuel cell system, and improve the market competitiveness.

[0050] Further, referring to Figure 1 The busbar inlet cooling liquid cavity 130 has a deionizer 500 dismounting port, and a deionizer baffle 600 is installed at the deionizer 500 dismounting port.

[0051] The deionizer baffle 600 is detachably connected to the busbar body 100, and a sealing structure is arranged between the two.

[0052] Specifically, the material of the deionizer baffle 600 is selected from metal materials. The rigidity performance of the metal material is better than that of the plastic material, and the metal material does not deform due to changes in external environmental temperature, thereby reducing the sealing performance at this position.

[0053] Optionally, the deionizer baffle 600 is connected to the busbar body 100 through a plurality of bolts, and sealing glue is applied between the two. By applying pressure through the bolts, the risk of leakage caused by the flatness of the contact surface of the two can be reduced, thereby ensuring the sealing performance of the connection position.

[0054] On the basis of the above embodiment, referring to Figure 2 and Figure 3 The inside of the busbar body 100 is further provided with a busbar inlet air cavity 150 and a busbar outlet air cavity 160, and the surface of the busbar body 100 is provided with an air inlet 151 communicating with the busbar inlet air cavity 150 and an air outlet 152 communicating with the busbar outlet air cavity 160.

[0055] In this embodiment, the busbar body 100 includes two parts arranged opposite to each other, and each part is provided with a corresponding half-slot structure. The two parts are connected in a sealed manner to form a corresponding cavity. Figure 3 and Figure 4 The busbar body 100 is formed in a whole by being buckled opposite to each other. Specifically, the surfaces of the two parts used for buckling can be bonded together and welded by friction welding to ensure the sealing requirement between the two.

[0056] The embodiment also provides a fuel cell system, which comprises the stack body 200 and the aforementioned current collecting mechanism. The fuel cell system provided by the embodiment comprises the aforementioned current collecting mechanism, and thus the technical advantages and effects that can be achieved by the fuel cell system also include the technical advantages and effects that can be achieved by the current collecting mechanism, which will not be described herein again.

[0057] Specifically, the stack body 200 is internally provided with a stack hydrogen inlet and outlet cavity (not shown in the drawings) and a stack coolant inlet and outlet cavity (not shown in the drawings), the stack hydrogen inlet and outlet cavity is in communication with the busbar hydrogen inlet cavity 110 and the busbar hydrogen outlet cavity 120, and the stack coolant inlet and outlet cavity is in communication with the busbar coolant inlet cavity 130 and the busbar coolant outlet cavity 140.

[0058] In specific use, the flow path of hydrogen is: the hydrogen inlet 111, the busbar hydrogen inlet cavity 110, the stack hydrogen inlet and outlet cavity, and the busbar hydrogen outlet cavity 120; and the flow path of coolant is: the coolant inlet 131, the busbar coolant inlet cavity 130, the stack coolant inlet and outlet cavity, the busbar coolant outlet cavity 140, and the coolant outlet 141.

[0059] Further, the stack body 200 is internally provided with a stack air inlet and outlet cavity, which is in communication with the busbar air inlet cavity 150 and the busbar air outlet cavity 160.

[0060] In specific use, the flow path of air is: the air inlet 151, the busbar air inlet cavity 150, the stack air inlet and outlet cavity, and the busbar air outlet cavity 160.

[0061] In combination with Figure 1 , Figure 3 and Figure 4 , the busbar body 100 and the stack body 200 are both cuboid structures, and are stacked along the width direction.

[0062] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A current collection mechanism, characterized by, The application relates to a hydrogen flow plate and a fuel cell stack. The hydrogen flow plate body (100) is internally provided with a hydrogen flow plate hydrogen inlet cavity (110), a hydrogen flow plate hydrogen outlet cavity (120), a hydrogen flow plate cooling liquid inlet cavity (130) and a hydrogen flow plate cooling liquid outlet cavity (140); the surface of the hydrogen flow plate body (100) is at least provided with a hydrogen inlet (111) communicated with the hydrogen flow plate hydrogen inlet cavity (110), a cooling liquid inlet (131) communicated with the hydrogen flow plate cooling liquid inlet cavity (130) and a cooling liquid outlet (141) communicated with the hydrogen flow plate cooling liquid outlet cavity (140); The hydrogen in the hydrogen flow plate hydrogen inlet cavity (110) can exchange heat with the medium in the hydrogen flow plate cooling liquid outlet cavity (140) to heat the hydrogen flowing through the hydrogen flow plate hydrogen inlet cavity (110); The hydrogen flow plate hydrogen inlet cavity (110) is internally provided with a heat exchange element (300) so that the hydrogen passes through the inside of the heat exchange element (300); The intersection of the hydrogen flow plate hydrogen inlet cavity (110) and the hydrogen flow plate cooling liquid outlet cavity (140) forms a communication cavity, and the hydrogen is heated through the heat exchange element (300); The heat exchange element (300) adopts a hollow tubular structure, is embedded in the inside of the hydrogen flow plate hydrogen inlet cavity (110) and has a gap between the inner wall of the hydrogen flow plate hydrogen inlet cavity (110) for the cooling liquid to pass through; The hydrogen flow plate cooling liquid outlet cavity (140) is provided in two sections, and the two sections are communicated with the hydrogen flow plate hydrogen inlet cavity (110) at different positions.

2. The current collection mechanism of claim 1, wherein, The inside of the hydrogen flow plate hydrogen outlet cavity (120) is integrally provided with a gas-liquid separator (400).

3. The current collection mechanism of claim 1, wherein, The inside of the hydrogen flow plate cooling liquid inlet cavity (130) is integrally provided with a deionizer (500).

4. The current collection mechanism of claim 3, wherein, The hydrogen flow plate cooling liquid inlet cavity (130) has a deionizer (500) dismounting opening, and the deionizer (500) dismounting opening is provided with a deionizer baffle (600).

5. The current collection mechanism of claim 4, wherein, The deionizer baffle is detachably connected to the hydrogen flow plate body (100) and is provided with a sealing structure between the hydrogen flow plate body (100).

6. The current collection mechanism of any of claims 1-5, wherein, The inside of the hydrogen flow plate body (100) is further provided with a hydrogen flow plate air inlet cavity (150) and a hydrogen flow plate air outlet cavity (160), and the surface of the hydrogen flow plate body (100) is provided with an air inlet (151) communicated with the hydrogen flow plate air inlet cavity (150) and an air outlet (152) communicated with the hydrogen flow plate air outlet cavity (160).

7. A fuel cell system characterized by comprising: The application relates to a hydrogen flow plate and a fuel cell stack. The inside of the hydrogen flow plate body (100) is further provided with a hydrogen flow plate air inlet cavity (150) and a hydrogen flow plate air outlet cavity (160), and the surface of the hydrogen flow plate body (100) is provided with an air inlet (151) communicated with the hydrogen flow plate air inlet cavity (150) and an air outlet (152) communicated with the hydrogen flow plate air outlet cavity (160). The hydrogen flow plate body (100) and the fuel cell stack body (200) are both cuboid structures and are stacked along the width direction.

8. The fuel cell system of claim 7, wherein The hydrogen flow plate body (100) and the fuel cell stack body (200) are both cuboid structures and are stacked along the width direction.

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