Electric pile end plate and fuel cell electric pile

Abstract

The utility model provides a galvanic pile end plate and a fuel cell galvanic pile. The galvanic pile end plate comprises an end plate main body and an intake manifold arranged on the end plate main body, an air inlet channel in the air inlet manifold is provided with a reducing section, the air inlet sectional area of the reducing section is gradually reduced in the air inlet direction, and at least part of the inner wall of the reducing section forms a blocking part for blocking condensate water in air inlet airflow from passing through the air inlet manifold. According to the galvanic pile end plate disclosed by the utility model, the structure of the air inlet channel in the air inlet manifold is optimized, so that when air flows through the air inlet manifold, the blocking part can prevent at least part of condensed water at the inlet of the air inlet manifold from entering the galvanic pile through the air inlet manifold, and therefore, the water accumulation risk of the air inlet manifold can be reduced, and a water pipeline function at the inlet of the galvanic pile is realized; and a good use effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, and in particular to a fuel cell stack end plate. The utility model also relates to a fuel cell stack provided with the fuel cell stack end plate. Background Art

[0002] As a power generation device, fuel cells have been widely used in the automotive, power supply, aviation and other fields due to their environmental protection, low noise and high thermal efficiency.

[0003] In a fuel cell, the stack end plate is one of the main components of the fuel cell stack. The stack end plate is installed on both sides of the core to compress the core and fix the core of the stack. At the same time, the stack end plate is also designed with a manifold port to distribute the fluid. The insulating plate mainly plays an insulating role. Both the end plate and the insulating plate have hydrogen inlet and outlet, air inlet and outlet, and coolant inlet and outlet. Therefore, the end plate and the insulating plate will be designed with openings and grooves according to the fluid distribution.

[0004] In the existing stack end plate, due to the limitation of the intake manifold shape, the risk of water blockage is easy to occur at the inlet during use. Therefore, the stack end plate needs to be further improved in structure. Utility Model Content

[0005] In view of this, the utility model aims to provide a stack end plate to block condensed water at the inlet end of the intake manifold.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A stack end plate comprises an end plate body and an intake manifold arranged on the end plate body;

[0008] The intake passage in the intake manifold has a reduced diameter section, and the intake cross-sectional area of ​​the reduced diameter section is gradually reduced along the intake direction, and at least part of the inner wall of the reduced diameter section forms a blocking portion for blocking condensed water in the intake airflow from passing through the intake manifold.

[0009] Furthermore, the air intake passage also includes an expanding section; the expanding section is located between the reducing section and the outlet end of the air intake passage, and the air intake cross-sectional area of ​​the expanding section is gradually increased along the air intake direction.

[0010] Furthermore, the end of the reduced diameter section is directly connected to the head end of the expanded diameter section, and the inner diameter of the end of the reduced diameter section is the same as the inner diameter of the head end of the expanded diameter section.

[0011] Furthermore, the air inlet passage also includes a connecting section located between the diameter-reducing section and the diameter-expanding section; the end of the diameter-reducing section and the beginning of the diameter-expanding section are connected via the connecting section.

[0012] Furthermore, from the longitudinal section of the intake manifold, the projection of the inner wall of the connecting section is straight or in an arc shape bulging toward the inside of the connecting section.

[0013] Furthermore, the end of the reduced diameter section is directly connected to the beginning of the expanded diameter section, and the inner diameter of the end of the reduced diameter section is smaller than or larger than the inner diameter of the beginning of the expanded diameter section, and a connecting vertical surface is formed at the connection between the reduced diameter section and the expanded diameter section.

[0014] Furthermore, the end plate body includes a first plate body having a plurality of through holes, and a second plate body; the first plate body is made of metal material, and the second plate body is made of insulating material; the second plate body is provided with a plurality of the intake manifolds, the plurality of the intake manifolds are arranged one by one corresponding to the plurality of the through holes, and each of the intake manifolds is embedded in the corresponding through hole.

[0015] Furthermore, the plurality of intake manifolds include a hydrogen intake manifold and an oxygen intake manifold; the reduced diameter section is provided in the hydrogen intake manifold and / or the oxygen intake manifold.

[0016] Furthermore, the first plate body and the second plate body are integrally formed.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The electric propulsion end plate described in the utility model optimizes the structure of the intake channel in the intake manifold, so that when the gas flows through the intake manifold, the blocking part on the reduced diameter section can block the condensed water formed at the inlet of the intake manifold, thereby preventing the condensed water from entering the fuel cell stack through the intake manifold, reducing the risk of water accumulation in the intake manifold, and playing a water management role for the condensed water at the inlet of the fuel cell stack, and has a very good use effect.

[0019] In addition, the air intake passage is provided with an expansion section, so that the air intake area of ​​the air intake passage is gradually reduced and then gradually increased along the air intake direction, which is conducive to improving the distribution of the fluid. The end of the reduction section is directly connected to the head end of the expansion section, and the inner diameters of the reduction section and the expansion section are the same, which can prevent condensed water from passing through the intake manifold while also having the characteristics of simple structure and easy processing and preparation.

[0020] Secondly, the connecting section is set in the intake channel, and the two ends of the connecting section are connected to the end of the reduced diameter section and the head end of the expanded diameter section respectively. This structure can also prevent condensed water from entering the fuel cell stack through the intake manifold, and is more conducive to the preparation and molding of the intake manifold when the intake manifold is long. The connecting vertical surface formed at the connection between the reduced diameter section and the expanded diameter section can further block at least part of the condensed water from passing through the intake manifold when the connecting vertical surface faces the inlet end of the intake manifold, and when the connecting vertical surface faces away from the inlet end of the intake manifold, the inner wall of the reduced diameter section has a larger inclination angle, which can further block at least part of the condensed water from passing through the intake manifold and is also conducive to improving the fluid distribution effect.

[0021] In addition, the end plate body adopts a first plate body made of metal and an insulating second plate body, which not only has sufficient structural strength to ensure the fixing effect of the battery stack, but also has a good insulation effect. The reduced diameter section is arranged in the oxygen intake manifold, which can prevent at least part of the condensed water at the inlet end of the oxygen intake manifold from passing through the oxygen intake manifold, and the reduced diameter section is arranged in the hydrogen manifold, which can prevent at least part of the condensed water at the inlet end of the hydrogen intake manifold from passing through the hydrogen intake manifold. The first plate body and the second plate body are integrally formed, which is conducive to the processing and preparation of the end plate body.

[0022] Another object of the present invention is to provide a fuel cell stack, in which the fuel cell stack end plate as described above is provided.

[0023] The fuel cell stack of the utility model can effectively prevent condensed water from entering the stack through the intake manifold by adopting the above-mentioned stack end plate, thereby reducing the risk of water blockage in the end cells, thereby helping to improve the performance and service life of the fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0025] Figure 1 This is a front view of the stack end plate according to an embodiment of the utility model;

[0026] Figure 2 This is a left view of the stack end plate according to an embodiment of the utility model;

[0027] Figure 3 This is a schematic diagram of the first structure of the air intake passage according to an embodiment of the utility model;

[0028] Figure 4 This is a schematic diagram of the second structure of the air intake passage according to the embodiment of the utility model;

[0029] Figure 5This is a third structural schematic diagram of the air intake passage according to the embodiment of the utility model;

[0030] Figure 6 This is a fourth structural schematic diagram of the air intake passage according to the embodiment of the utility model;

[0031] Figure 7 This is a fifth structural schematic diagram of the air intake passage according to the embodiment of the utility model;

[0032] Figure 8 This is a sixth structural schematic diagram of the air intake passage according to an embodiment of the utility model;

[0033] Fig. 9 This is a schematic diagram of the structure of a fuel cell stack according to an embodiment of the present utility model;

[0034] Description of reference numerals:

[0035] 1. End plate body; 2. Core; 3. Current collector; 4. Stack shell;

[0036] 11. First plate body; 12. Second plate body; 121. Hydrogen inlet manifold; 122. Oxygen inlet manifold; 123. Cooling medium liquid outlet manifold; 124. Cooling medium liquid inlet manifold; 125. Hydrogen outlet manifold; 126. Oxygen outlet manifold; 10. Reduced diameter section; 20. Expanded diameter section; 30. Connecting section; 100. Blocking portion; 200. Connecting facade. DETAILED DESCRIPTION

[0037] 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.

[0038] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship 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 limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0040] In the structure of fuel cells, the stack end plate is one of the main components of the fuel cell stack. The stack end plate is installed on both sides of the stack to compress the core to fix the core. The stack end plate is provided with a manifold port for distributing fluid between cells to ensure the consistency of the amount of gas supplied to each cell.

[0041] However, in the existing stack end plate, due to the limitation of the intake manifold shape, the gas at the inlet cannot be reasonably distributed, which affects the uniformity of the whole stack. In addition, the inlet is prone to water blockage during use. Therefore, the utility model proposes a stack end plate to prevent condensed water at the inlet end of the intake manifold from entering the stack, thereby reducing the risk of water accumulation in the intake manifold.

[0042] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0043] Embodiment 1

[0044] The present embodiment relates to a fuel cell stack end plate, which is capable of blocking condensed water formed at the inlet of the intake manifold and effectively preventing the condensed water from entering the fuel cell stack through the intake manifold.

[0045] In terms of overall structure, see Figure 1 to Figure 2 As shown, the stack end plate of this embodiment mainly includes an end plate body 1 and an intake manifold arranged on the end plate body 1. Figures 3 to 8 As shown, the intake passage in the intake manifold has a reduced diameter section 10, and the intake cross-sectional area of ​​the reduced diameter section 10 is gradually reduced along the intake direction, and at least part of the inner wall of the reduced diameter section 10 forms a blocking portion 100 to block condensed water in the intake air flow from passing through the intake manifold.

[0046] At this time, when the gas flows through the intake manifold, the blocking portion 100 can block at least part of the condensed water formed at the inlet end of the intake manifold, preventing it from entering the fuel cell stack through the intake manifold, thereby reducing the risk of water accumulation in the intake manifold, thereby playing a certain role in water-gas separation for the condensed water at the inlet of the fuel cell stack, that is, it can play a water management role for the condensed water at the inlet of the fuel cell stack.

[0047] Based on the above overall introduction, specifically, as a preferred implementation, combined with Figures 1 to 8 As shown, in this embodiment, the end plate body 1 has a gas inlet side and a core side arranged opposite to each other. The core side is the side of the end plate body 1 facing the core, and the gas inlet side is the side of the end plate body 1 facing away from the core.

[0048] Along the thickness direction of the end plate body 1, the intake manifold is arranged to penetrate the end plate body 1, and the inlet end and the outlet end of the intake manifold are located at the gas inlet side and the core side respectively. The intake area of ​​the reduced diameter section 10 is gradually reduced along the intake direction from the inlet end of the channel, and the profile of the reduced diameter section 10 is trapezoidal in the longitudinal cross-sectional projection of the intake manifold. The above-mentioned blocking portion 100 is specifically at least part of the inner wall of the reduced diameter section 10. The blocking portion adopts at least part of the inner wall of the reduced diameter section 10, so that the blocking portion has the characteristics of simple structure and easy processing and preparation.

[0049] On the basis that the air intake passage has the reduced diameter section 10, as a preferred embodiment, the air intake passage of this embodiment further includes an expanded diameter section 20. The expanded diameter section 20 is specifically located between the reduced diameter section 10 and the outlet end of the air intake passage, and the air intake cross-sectional area of ​​the expanded diameter section 20 is gradually increased along the air intake direction. At this time, the expanded diameter section 20 cooperates with the reduced diameter section 10, so that the air intake area of ​​the air intake passage gradually decreases along the air intake direction, and then gradually increases, thereby not only preventing the condensed water in the air intake airflow from passing through the intake manifold, but also facilitating the improvement of the distribution effect of the fluid.

[0050] See also Figure 3 and Figure 8 As shown, in the intake passage of this embodiment, the projections of the reduced diameter section 10 and the expanded diameter section 20 on the longitudinal section of the intake manifold are both trapezoidal. Figure 3 and Figure 4 As shown, the end of the reduced diameter section 10 is directly connected to the head end of the expanded diameter section 20, and the inner diameter of the end of the reduced diameter section 10 is the same as the inner diameter of the head end of the expanded diameter section 20. This arrangement can prevent condensed water from passing through the intake manifold while also having the characteristics of simple structure and easy processing and preparation.

[0051] Continue to view Figure 3 and Figure 4 As shown, the inner diameter of the end of the reduced diameter section 10 is A, the inner diameter of the large diameter end is C, the inner diameter of the head end of the expanded diameter section 20 is D, the inner diameter of the head end of the expanded diameter section 20 is the same as the inner diameter of the end of the reduced diameter section 10, that is, also A, and the depth of the expanded diameter section 20 is B. It is worth noting that the dimension values ​​A, B, C and D can be combined in different ways.

[0052] As another possible implementation structure, Figure 5 and Figure 6As shown, the intake passage also includes a connecting section 30 located between the reduced diameter section 10 and the expanded diameter section 20, and the end of the reduced diameter section 10 and the head end of the expanded diameter section 20 are connected through the connecting section 30. In specific implementation, the inner diameters at both ends of the connecting section 30 are respectively the same as the inner diameters at the end of the reduced diameter section 10 and the head end of the expanded diameter section 20, and the two ends of the connecting section 30 are respectively connected to the end of the reduced diameter section 10 and the head end of the expanded diameter section 20. This structure can not only prevent condensed water from passing through the intake manifold, but also facilitate the preparation and molding of the intake manifold when the intake manifold is long.

[0053] In terms of specific structure, from the longitudinal section of the intake manifold, the connecting section 30 is as follows: Figure 5 As shown in FIG. 1 , the inner wall of the connecting section 30 is straight. Alternatively, the connecting section 30 is as shown in FIG. Figure 6 As shown in FIG. 1 , the connecting section 30 bulges inwardly in an arc shape, that is, the connecting section 30 bulges in an arc shape in the direction of the central axis of the air intake passage. The above-mentioned structure is also conducive to the preparation and molding of the air intake passage and also conducive to improving the distribution of the fluid.

[0054] It can be understood that, along the air intake direction, the projections of the reduced diameter section 10 , the connecting section 30 and the expanded diameter section 20 on the longitudinal section of the intake manifold are overall continuous arc sections, which is also possible.

[0055] As another possible implementation structure, see Figure 7 and Figure 8 As shown, in this structure, the end of the reduced diameter section 10 is directly connected to the beginning of the expanded diameter section 20, and the inner diameter of the end of the reduced diameter section 10 is smaller than or larger than the inner diameter of the beginning of the expanded diameter section 20, that is, the inner diameters of the end of the reduced diameter section 10 and the beginning of the expanded diameter section 20 are different. At this time, a connecting vertical surface 200 is formed at the connection between the reduced diameter section 10 and the expanded diameter section 20.

[0056] Specifically, Figure 7 As shown, the inner diameter of the end of the reduced diameter section 10 is smaller than the inner diameter of the head end of the expanded diameter section 20. At this time, the connecting vertical surface 200 faces away from the inlet end of the intake manifold, and the inner wall of the reduced diameter section 10 has a larger inclination angle, which can further prevent at least part of the condensed water from entering the fuel cell stack through the intake manifold and also help improve the fluid distribution effect. Figure 8 As shown, the inner diameter of the end of the reduced diameter section 10 is larger than the inner diameter of the head end of the expanded diameter section 20. At this time, the connecting vertical surface 200 faces the inlet end of the intake manifold. Under the action of the blocking portion 100 and the connecting vertical surface 200, at least part of the condensed water can be further blocked from entering the fuel cell stack through the intake manifold.

[0057] In this embodiment, as a preferred embodiment, review Figure 1 and Figure 2As shown, the end plate body 1 includes a first plate body 11 having a plurality of through holes, and a second plate body 12. The first plate body 11 is made of metal material, and the second plate body 12 is made of insulating material. In addition, a plurality of intake manifolds are arranged on the second plate body 12, and the plurality of intake manifolds are arranged one by one corresponding to the plurality of through holes, and each intake manifold is embedded in the corresponding through hole.

[0058] In the above structure, the end plate body 1 is provided with a first plate body 11 made of metal material and an insulating second plate body 12, which not only has sufficient structural strength to ensure the fixing effect of the battery stack, but also has a good insulating effect.

[0059] Moreover, the multiple intake manifolds arranged on the second plate body 12 include a hydrogen intake manifold 121 and an oxygen intake manifold 122. The above-mentioned reduced diameter section 10 is preferably arranged in the hydrogen intake manifold 121 to prevent at least part of the condensed water at the inlet end of the hydrogen intake manifold from entering the fuel cell stack through the hydrogen intake manifold 121.

[0060] It should be noted that, in addition to being disposed only in the hydrogen intake manifold 121, the reduced diameter section 10 may also be disposed only in the oxygen intake manifold 122 to prevent at least part of the condensed water at the inlet end of the oxygen intake manifold 122 from entering the fuel cell stack through the oxygen intake manifold 122. Of course, it is understandable that the reduced diameter section 10 may also be disposed in both the hydrogen intake manifold 121 and the oxygen intake manifold 122, which is also feasible.

[0061] In addition, as a preferred embodiment, in this embodiment, the first plate body 11 and the second plate body 12 are integrally formed, which is convenient for processing and preparing the end plate body 1. Of course, the first plate body 11 and the second plate body 12 can also adopt a split structure, and then be assembled and fixed to form an integral end plate body 1.

[0062] In addition, in this embodiment, in addition to the hydrogen intake manifold 121 and the oxygen intake manifold 122 , the end plate body 1 is also provided with a hydrogen outlet manifold 125 , an oxygen outlet manifold 126 , a cooling medium inlet manifold 124 and a cooling medium outlet manifold 123 .

[0063] The arrangement of the above manifolds is as follows: Figure 1 As shown in FIG. 1 , the hydrogen inlet manifold 121 and the hydrogen outlet manifold 125 as well as the oxygen inlet manifold 122 and the oxygen outlet manifold 126 are arranged diagonally. The cooling medium inlet manifold 124 and the cooling medium outlet manifold 123 are arranged at intervals along the length direction of the end plate body 1, and the cooling medium inlet manifold 124 is located below the oxygen inlet manifold 122. Specifically, along the height direction of the end plate body 1, Figure 1 On the middle right side, from top to bottom, are the hydrogen inlet manifold 121, the cooling medium outlet manifold 123, and the oxygen outlet manifold 126. Figure 1On the left side in the middle, from top to bottom, are an oxygen inlet manifold 122 , a cooling medium inlet manifold 124 , and a hydrogen outlet manifold 125 .

[0064] The stack end plate of this embodiment optimizes the structure of the intake passage in the intake manifold so that after the gas flows through the intake manifold, the blocking portion 100 can block at least part of the condensed water at the inlet end of the intake manifold from entering the stack through the intake manifold, thereby reducing the risk of water accumulation at the end of the intake manifold, thereby realizing the water pipeline function at the inlet of the stack and having a good use effect.

[0065] Embodiment 2

[0066] The present embodiment relates to a fuel cell stack, in which the stack end plate of the first embodiment is provided.

[0067] like Fig. 9 As shown, the fuel cell stack includes a stack shell 4, a stack core 2, a current collecting plate 3 and a stack end plate of Embodiment 1. The stack core 2 is accommodated in a receiving cavity in the stack shell 4, the stack end plate is installed on one side of the stack, and the current collecting plate 3 is sandwiched between the stack core 2 and the stack end plate.

[0068] The fuel cell stack of this embodiment, by adopting the stack end plate of the first embodiment, can effectively prevent condensed water formed at the intake manifold port from entering the stack through the intake manifold, thereby reducing the risk of water blockage in the end cells, thereby facilitating improving the performance and service life of the fuel cell.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stack end plate, characterized in that: It comprises an end plate body (1), and an intake manifold arranged on the end plate body (1); The intake passage in the intake manifold has a reduced diameter section (10), and the intake cross-sectional area of ​​the reduced diameter section (10) is gradually reduced along the intake direction, and at least part of the inner wall of the reduced diameter section (10) forms a blocking portion (100) for blocking condensed water in the intake air flow from passing through the intake manifold.

2. The stack end plate according to claim 1, characterized in that: The air inlet passage also includes an expanded diameter section (20); The expanding diameter section (20) is located between the reducing diameter section (10) and the outlet end of the air intake passage, and the air intake cross-sectional area of ​​the expanding diameter section (20) is gradually increased along the air intake direction.

3. The stack end plate according to claim 2, characterized in that: The end of the reduced diameter section (10) is directly connected to the beginning of the expanded diameter section (20), and the inner diameter of the end of the reduced diameter section (10) is the same as the inner diameter of the beginning of the expanded diameter section (20).

4. The stack end plate according to claim 2, characterized in that: The air inlet passage also includes a connecting section (30) located between the reduced diameter section (10) and the expanded diameter section (20); The end of the reduced diameter section (10) and the beginning of the expanded diameter section (20) are connected via the connecting section (30).

5. The stack end plate according to claim 4, characterized in that: From the longitudinal section of the intake manifold, the inner wall of the connecting section (30) is straight or in an arc shape that bulges toward the inside of the connecting section (30).

6. The stack end plate according to claim 2, characterized in that: The end of the reduced diameter section (10) is directly connected to the beginning of the expanded diameter section (20), and the inner diameter of the end of the reduced diameter section (10) is smaller than or larger than the inner diameter of the beginning of the expanded diameter section (20), and a connecting vertical surface (200) is formed at the connection between the reduced diameter section (10) and the expanded diameter section (20).

7. The stack end plate according to any one of claims 1 to 6, characterized in that: The end plate body (1) comprises a first plate body (11) having a plurality of through holes, and a second plate body (12); The first plate body (11) is made of metal material, and the second plate body (12) is made of insulating material; The second plate body (12) is provided with a plurality of the intake manifolds, the plurality of the intake manifolds are arranged in one-to-one correspondence with the plurality of the through holes, and each of the intake manifolds is embedded in the corresponding through hole.

8. The stack end plate according to claim 7, characterized in that: The plurality of intake manifolds include a hydrogen intake manifold (121) and an oxygen intake manifold (125); The reduced diameter section (10) is provided in the hydrogen intake manifold (121) and / or the oxygen intake manifold (125).

9. The stack end plate according to claim 7, characterized in that: The first plate body (11) and the second plate body (12) are integrally formed.

10. A fuel cell stack, characterized in that: The fuel cell stack is provided with a stack end plate according to any one of claims 1 to 9.

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