Fuel cell stack

Abstract

The utility model provides a fuel cell stack which comprises a cell stack body, and a gas public flow channel is arranged on the cell stack body; the fuel cell further comprises an adjusting component, the adjusting component is inserted into the gas public flow channel, and the adjusting component extends along the length direction of the gas public flow channel; wherein the adjusting part comprises a supporting piece and an adjusting piece, the adjusting piece is arranged on the supporting piece, and the horizontal distance between the adjusting piece and the inner wall face of the gas public flow channel is gradually increased in the flowing-in direction of gas in the gas public flow channel. According to the invention, the problem of poor stack consistency caused by non-uniform gas flow distribution in the gas inlet common flow channel of the cell stack in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, and more particularly, to a fuel cell stack. Background Art

[0002] A fuel cell stack is the core part of a fuel cell system, which is stacked by multiple fuel cell units. Each unit has a gas inlet, and after stacking, a gas common flow channel is formed. The fuel cell stack can directly convert chemical energy into electrical energy, and has the advantages of high efficiency, low emissions, and renewable energy.

[0003] Currently, in order to increase the power of the fuel cell stack, the method of increasing the number of fuel cell units is mostly adopted. The length or height of existing high-power fuel cell stacks is more than 700 mm. However, the increase in the length of the fuel cell stack also leads to the problem of uneven fluid distribution at the gas inlet common flow channel of the fuel cell stack. Affected by the frictional resistance, the farther away from the gas inlet position, the smaller the fluid velocity, and the less the fluid volume entering the plate, thus affecting the consistency of the whole stack fluid and resulting in the problem of poor stack consistency. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a fuel cell stack to solve the problem of poor stack consistency caused by uneven gas flow distribution in the inlet flow channel of the fuel cell stack in the prior art.

[0005] To achieve the above object, according to one aspect of the utility model, a fuel cell stack is provided, including a fuel cell stack body with a gas common flow channel arranged thereon; the fuel cell further includes: an adjusting member inserted into the gas common flow channel, and the adjusting member extends along the length direction of the gas common flow channel; wherein, the adjusting member includes a support member and an adjusting member, the adjusting member is arranged on the support member, and along the inflow direction of the gas in the gas common flow channel, the horizontal distance between the adjusting member and the inner wall surface of the gas common flow channel gradually increases.

[0006] Further, the adjusting member includes a guiding end face, the gas common flow channel includes a first flow channel wall surface, and the guiding end face is opposite to the first flow channel wall surface; along the inflow direction of the gas, the horizontal distance between the guiding end face and the first flow channel wall surface gradually increases.

[0007] Further, the guiding end face is an inclined surface or an arc surface.

[0008] Further, along the inflow direction of the gas, the thickness of the adjusting member gradually decreases.

[0009] Further, the width of the gas common flow channel is D, and the maximum thickness of the adjusting member is d; d ≤ 5% * D.

[0010] Further, the gas common flow channel includes a first flow channel wall surface and a second flow channel wall surface which are oppositely arranged; the support member is attached to the first flow channel wall surface, the adjusting member is oppositely arranged with respect to the second flow channel wall surface, and along the inflow direction of the gas, the minimum horizontal distance between the adjusting member and the second flow channel wall surface gradually increases.

[0011] Further, an installation groove is provided on the support member, and at least a part of the adjusting member is embedded in the installation groove.

[0012] Further, the support member includes: a first support body, a second support body, and a third support body which are sequentially connected, the first support body and the third support body are oppositely arranged, and the installation groove is located between the first support body, the second support body, and the third support body; the adjusting member is attached to and connected to the second support body.

[0013] Further, a connecting plate is provided on the adjusting member, the connecting plate extends from the adjusting member in a direction approaching the second support body, and a connecting member is provided on the connecting plate; a connecting hole is provided on the top surface of the second support body, and the connecting member is inserted into the connecting hole and is in interference fit with the connecting hole.

[0014] Further, the first support body has a first end and a second end which are oppositely arranged, the first end is connected to the second support body, and the second end extends in a direction away from the second support body; in the direction from the first end to the second end, the horizontal distance between the first support body and the third support body gradually increases.

[0015] Applying the technical solution of the present utility model, the fuel cell stack includes a stack body and an adjusting component. A gas common flow channel is provided on the stack body, the adjusting component is inserted into the gas common flow channel, and the adjusting component extends along the length direction of the gas common flow channel; wherein, the adjusting component includes a support member and an adjusting member, the adjusting member is arranged on the support member, and along the inflow direction of the gas in the gas common flow channel, the horizontal distance between the adjusting member and the inner wall surface of the gas common flow channel gradually increases. With such a setting, during the process of the gas flowing along the length direction of the gas common flow channel, since the horizontal distance between the adjusting member and the inner wall surface of the gas common flow channel gradually increases, the cross-sectional area of the gas flow is increased, so that the end of the gas common flow channel far from the air inlet can accommodate more gas, thereby making the flow rate distribution of the gas in the gas common flow channel uniform, avoiding the problem in the prior art that due to the gradual decrease of the gas flow rate, the gas flow rate at the end of the gas common flow channel far from the air inlet is insufficient, making the gas distribution more uniform, and improving the consistency of the fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The specification drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 Shows a structural exploded view of a battery stack body and a regulating component in a fuel cell stack according to the present utility model;

[0018] Figure 2 Shows a schematic structural view of a regulating component in a fuel cell stack according to the present utility model;

[0019] Figure 3 Shows a front view of a regulating component in a fuel cell stack according to the present utility model;

[0020] Figure 4 Shows a side view of a regulating component in a fuel cell stack according to the present utility model;

[0021] Figure 5 Shows according to Figure 3 A sectional view of the B-B plane in;

[0022] Figure 6 Shows Figure 5 An enlarged view of part A in;

[0023] Figure 7 Shows a structural exploded view of a regulating component in a fuel cell stack according to the present utility model;

[0024] Figure 8 Shows according to Figure 7 An enlarged view of part C in;

[0025] Figure 9 Shows according to Figure 7 An enlarged view of part D in;

[0026] Figure 10 Shows a top view of a battery stack body of a fuel cell stack according to the present utility model;

[0027] Figure 11 Shows according to Figure 10 A sectional view of the A-A plane in.

[0028] Wherein, the above-mentioned drawings include the following reference numerals:

[0029] 1. Battery stack body; 10. Gas common flow channel; 2. Regulating component; 21. Support member; 22. Regulating member; 220. Flow guiding end face; 101. First flow channel wall surface; 102. Second flow channel wall surface; 210. Installation groove; 211. First support body; 212. Second support body; 213. Third support body; 221. Connection plate; 2210. Connecting member; 2120. Connection hole. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will describe the present utility model in detail with reference to the drawings and in conjunction with the embodiments.

[0031] As mentioned in the background art, for existing fuel cells, in order to increase the power, generally the number of battery monomers is increased. However, this results in an overly high overall height of the fuel cell stack, an overly long length of the common intake air flow channel, uneven gas distribution in the flow channel, a gradual slowdown in the gas flow rate during the intake process, and a much larger intake air volume for the battery monomers at one end near the intake port of the common intake air flow channel than that for the battery monomers at the bottom of the common intake air flow channel. Thus, the consistency of the fuel cell stack cannot be ensured. Therefore, in the fuel cell stack of the present application, an adjusting member 2 is provided in the gas common flow channel 10 to adjust the distribution space of the gas in the gas common flow channel 10. Specifically, the adjusting member 2 includes a support member 21 and an adjusting member 22. The support member 21 is used to support the adjusting member 22, and the horizontal distance between the adjusting member 22 and the inner wall surface of the gas common flow channel 10 gradually increases. During the intake process, the space through which the gas passes gradually increases, and the intake air volume gradually increases, thereby compensating for the problem in the prior art that the gas flow rate at the bottom of the gas common flow channel 10 decreases due to the overly long fuel cell stack and increasing the consistency of the fuel cell stack.

[0032] Please refer to Figures 1 to 11 , the present utility model provides a fuel cell stack, including a fuel cell stack body 1, and a gas common flow channel 10 is provided on the fuel cell stack body 1; the fuel cell further includes: an adjusting member 2, the adjusting member 2 is inserted into the gas common flow channel 10, and the adjusting member 2 extends along the length direction of the gas common flow channel 10; wherein, the adjusting member 2 includes a support member 21 and an adjusting member 22, the adjusting member 22 is arranged on the support member 21, and along the inflow direction of the gas in the gas common flow channel 10, the horizontal distance between the adjusting member 22 and the inner wall surface of the gas common flow channel 10 gradually increases.

[0033] According to the fuel cell stack provided by the present application, it includes a stack body 1 and an adjusting component 2. A gas common flow channel 10 is provided on the stack body 1, and the adjusting component 2 is inserted into the gas common flow channel 10 and extends along the length direction of the gas common flow channel 10. Among them, the adjusting component 2 includes a support member 21 and an adjusting member 22. The adjusting member 22 is arranged on the support member 21. Along the inflow direction of the gas in the gas common flow channel 10, the horizontal distance between the adjusting member 22 and the inner wall surface of the gas common flow channel 10 gradually increases. With such a setting, during the process of the gas flowing along the length direction of the gas common flow channel 10, since the horizontal distance between the adjusting member 22 and the inner wall surface of the gas common flow channel 10 gradually increases, the cross-sectional area of the gas flow is increased, so that the end of the gas common flow channel 10 far from the air inlet can accommodate more gas, thereby making the flow distribution of the gas in the gas common flow channel 10 uniform, avoiding the problem in the prior art that due to the gradual decrease of the gas flow rate, the gas flow at the end of the gas common flow channel 10 far from the air inlet is insufficient, making the gas distribution more uniform and improving the consistency of the fuel cell stack.

[0034] Specifically, as Figure 2 shown, the adjusting member 22 includes a guiding end face 220, and the gas common flow channel 10 includes a first flow channel wall surface 101. The guiding end face 220 faces the first flow channel wall surface 101. Along the inflow direction of the gas, the horizontal distance between the guiding end face 220 and the first flow channel wall surface 101 gradually increases. The guiding end face 220 extends along the length direction of the gas common flow channel 10, and the guiding end face 220 is used to guide the gas flow in the gas common flow channel 10, and during the flowing process, more gas flows into the bottom of the gas common flow channel 10.

[0035] In an embodiment provided by the present application, the guiding end face 220 is an inclined plane or an arc surface. When the height of the fuel cell stack is too high, that is, when the length of the gas common flow channel 10 is too long, the guiding end face 220 can be set as an arc surface to guide the gas.

[0036] In another embodiment provided by the present application, as Figure 5 shown, along the inflow direction of the gas, the thickness of the adjusting member 22 gradually decreases.

[0037] Preferably, as Figure 6 shown, the width of the gas common flow channel 10 is D, and the maximum thickness of the adjusting member 22 is d; d ≤ 5% * D. By limiting the size relationship between the maximum thickness of the adjusting member 22 and the width of the gas common flow channel 10, it is avoided that the thickness of the adjusting member 22 is too large and occupies a large space in the gas common flow channel 10, thereby affecting the air intake.

[0038] During the specific implementation process, as Figure 3 、 Figure 4 and Figure 11As shown in the figure, the gas common flow channel 10 includes a first flow channel wall surface 101 and a second flow channel wall surface 102 which are oppositely arranged; the support member 21 is attached to the first flow channel wall surface 101, and the adjusting member 22 is arranged opposite to the second flow channel wall surface 102. Along the gas inflow direction, the minimum horizontal distance between the adjusting member 22 and the second flow channel wall surface 102 gradually increases. Among them, the length a of the adjusting component 2 is the same as the height of the gas common flow channel 10, and the width b of the support member 21 is greater than the height of the first flow channel wall surface 101, so that an interference fit is formed between the support member 21 and the gas common flow channel 10. The height c of the support member 21 can be adjusted according to the width of the gas common flow channel 10, but the height c is less than or equal to 5% of the width of the gas common flow channel 10, so as to prevent the support member 21 from occupying a large space in the gas common flow channel 10 and affecting the air intake volume.

[0039] In the present application, as Figures 7 to 10 shown, an installation groove 210 is provided on the support member 21, and at least part of the adjusting member 22 is embedded in the installation groove 210. The adjusting member 22 is supported by the support member 21, so that the adjusting member 22 can be stably installed in the gas common flow channel 10.

[0040] Specifically, the support member 21 includes: a first support body 211, a second support body 212 and a third support body 213 which are connected in sequence. The first support body 211 and the third support body 213 are oppositely arranged, and the installation groove 210 is located between the first support body 211, the second support body 212 and the third support body 213; the adjusting member 22 is attached to and connected to the second support body 212. The adjusting member 22 is supported by the first support body 211, the second support body 212 and the third support body 213. Among them, the width of the adjusting member 22 is greater than the horizontal distance between the first support body 211 and the third support body 213, so that an interference fit is formed between the adjusting member 22 and the installation groove 210 to ensure the stability of the adjusting member 22.

[0041] In order to facilitate the stable connection between the adjusting member 22 and the support member 21, a connecting plate 221 is provided on the adjusting member 22. The connecting plate 221 extends from the adjusting member 22 in the direction close to the second support body 212, and a connecting member 2210 is provided on the connecting plate 221; a connecting hole 2120 is provided on the top surface of the second support body 212, and at least part of the connecting member 2210 is inserted into the connecting hole 2120 and is in interference fit with the connecting hole 2120. The connecting member 2210 is a plug structure, and the adjusting member 22 can be directly inserted into the connecting hole 2120 through the connecting member 2210, so that the adjusting member 22 is connected to the support member 21.

[0042] Further, in order to ensure sufficient gas flow in the gas common flow channel 10, the first support body 211 has a relatively arranged first end and a second end. The first end is connected to the second support body 212, and the second end extends in a direction away from the second support body 212. In the direction from the first end to the second end, the horizontal distance between the first support body 211 and the third support body 213 gradually increases.

[0043] In another embodiment provided by the present application, the adjusting member 22 and the support member 21 are of an integrally formed structure.

[0044] The material of the support member 21 should have a certain flexibility to ensure that it can be assembled into the fuel cell stack, and it should be insulating, high-temperature resistant, not spill impurity ions, and can adhere to the common flow port. Organic materials (such as polyvinylidene fluoride, polytetrafluoroethylene, silicone rubber, and fluororubber, etc.) or organic-inorganic composite materials can be selected. The material of the adjusting member 22 is slightly rigid and plays a supporting role. Modified polyether ether ketone, polytetrafluoroethylene, and rubber-like materials can be selected. The shape of the adjusting component 2 can also be designed according to the shape of the common flow port of the fuel cell stack.

[0045] By changing the thickness d of the adjusting member 22, a fuel cell stack with adjustable power can be formed. When power adjustment is required, the thickness of the adjusting member 22 can be increased or decreased without damaging the fuel cell stack, and the power of the fuel cell stack can be adjusted to adapt to different application scenarios.

[0046] An increase in the height of the fuel cell stack will cause uneven fluid distribution, thereby affecting the intake air consistency and resulting in poor consistency of the fuel cell stack. In the present application, by designing the fuel cell stack structure, a variable cross-section structure (adjusting component 2) is added, and the fluid flow at different positions of the fuel cell stack can be adjusted by adjusting the thickness (adjusting member 22) of the variable cross-section structure, thereby improving the consistency of the fuel cell stack.

[0047] Through further development of the variable cross-section structure (adjusting member 22), for scenarios with different power outputs, the thickness of the variable cross-section structure (the thickness of the adjusting member 22) can be changed. Without damaging the fuel cell stack structure, a single fuel cell stack can output different powers under optimal operating conditions, extending the service life of the fuel cell stack.

[0048] From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

[0049] According to the fuel cell stack provided by the present application, it includes a stack body 1 and an adjusting component 2. A gas common flow channel 10 is provided on the stack body 1, and the adjusting component 2 is inserted into the gas common flow channel 10, and the adjusting component 2 extends along the length direction of the gas common flow channel 10. Among them, the adjusting component 2 includes a support member 21 and an adjusting member 22. The adjusting member 22 is arranged on the support member 21. Along the inflow direction of the gas in the gas common flow channel 10, the horizontal distance between the adjusting member 22 and the inner wall surface of the gas common flow channel 10 gradually increases. With such a setting, during the process of the airflow flowing along the length direction of the gas common flow channel 10, since the horizontal distance between the adjusting member 22 and the inner wall surface of the gas common flow channel 10 gradually increases, the cross-sectional area of the gas flow is increased, so that the end of the gas common flow channel 10 far from the air inlet can accommodate more gas, thereby making the flow rate distribution of the airflow in the gas common flow channel 10 uniform, avoiding the problem in the prior art that due to the gradual decrease of the gas flow velocity, the gas flow rate at the end of the gas common flow channel 10 far from the air inlet is insufficient, making the gas distribution more uniform, and improving the consistency of the fuel cell stack.

[0050] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A fuel cell stack, comprising a stack body (1), and a gas common flow channel (10) is arranged on the stack body (1); It is characterized in that, The fuel cell further comprises: An adjusting member (2), the adjusting member (2) is inserted into the gas common flow channel (10), and the adjusting member (2) extends along the length direction of the gas common flow channel (10); Wherein, the adjusting member (2) comprises a support member (21) and an adjusting member (22), the adjusting member (22) is arranged on the support member (21), and along the inflow direction of the gas in the gas common flow channel (10), the horizontal distance between the adjusting member (22) and the inner wall surface of the gas common flow channel (10) gradually increases.

2. The fuel cell stack according to claim 1, characterized in that, The adjusting member (22) comprises a guiding end face (220), the gas common flow channel (10) comprises a first flow channel wall surface (101), and the guiding end face (220) faces the first flow channel wall surface (101); Along the inflow direction of the gas, the horizontal distance between the guiding end face (220) and the first flow channel wall surface (101) gradually increases.

3. The fuel cell stack according to claim 2, wherein The guiding end face (220) is an inclined plane or an arc surface.

4. The fuel cell stack according to claim 1, characterized in that Along the inflow direction of the gas, the thickness of the adjusting member (22) gradually decreases.

5. The fuel cell stack according to claim 4, characterized in that, The width of the gas common flow channel (10) is D, and the maximum thickness of the adjusting member (22) is d; d ≤ 5% * D.

6. The fuel cell stack according to claim 1, characterized in that The gas common flow channel (10) comprises a first flow channel wall surface (101) and a second flow channel wall surface (102) which are oppositely arranged; The support member (21) is attached to the first flow channel wall surface (101), the adjusting member (22) is oppositely arranged with respect to the second flow channel wall surface (102), and along the inflow direction of the gas, the minimum horizontal distance between the adjusting member (22) and the second flow channel wall surface (102) gradually increases.

7. The fuel cell stack according to claim 1, wherein, An installation groove (210) is arranged on the support member (21), and the adjusting member (22) is embedded in the installation groove (210).

8. The fuel cell stack according to claim 7, characterized in that, The support member (21) comprises: A first support body (211), a second support body (212) and a third support body (213) which are connected in sequence, the first support body (211) and the third support body (213) are oppositely arranged, and the installation groove (210) is located between the first support body (211), the second support body (212) and the third support body (213); The adjusting member (22) is attached to and connected with the second support body (212).

9. The fuel cell stack according to claim 8, characterized in that, A connecting plate (221) is arranged on the adjusting member (22), the connecting plate (221) extends from the adjusting member (22) towards the direction close to the second support body (212), and a connecting member (2210) is arranged on the connecting plate (221); A connecting hole (2120) is arranged on the top surface of the second support body (212), and at least a part of the connecting member (2210) is inserted into the connecting hole (2120) and is in interference fit with the connecting hole (2120).

10. The fuel cell stack according to claim 8, characterized in that, The first support body (211) has a first end and a second end that are oppositely arranged. The first end is connected to the second support body (212), and the second end extends in a direction away from the second support body (212). In the direction from the first end to the second end, the horizontal distance between the first support body (211) and the third support body (213) gradually increases.

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