Airflow distribution device and electrochemical energy conversion device comprising same

Abstract

An airflow distribution device and an electrochemical energy conversion device comprising same. The airflow distribution device comprises a main body (1), wherein the main body (1) comprises a first end face (13) and a second end face (14) arranged opposite each other, an exhaust passage (2) running through the first end face (13) and / or the second end face (14) is provided in the main body (1), a pressure loss increasing passage (3) is also provided in the main body (1), two ends of the pressure loss increasing passage (3) are in communication with the exhaust passage (2) and an outer side wall of the main body (1), respectively, and the exhaust passage (2) is also in communication with a stack (8).

Description

Air flow distribution device and electrochemical energy conversion device including the same Technical Field

[0001] The present invention relates to the field of electrochemical technology, and in particular to an airflow distribution device and an electrochemical energy conversion device comprising the same. Background Art

[0002] Currently, solid oxide fuel cells (SOFCs) and solid oxide electrolyzers (SOECs) are collectively referred to as solid oxide cells (SOCs). Solid oxide cells (SOCs) are advanced electrochemical energy storage and conversion devices with broad application prospects in clean energy generation and CO2 conversion. A solid oxide fuel cell (SOFC) is an energy conversion device that directly converts the chemical energy stored in the fuel and oxidant into electrical energy. Its high operating temperature, typically between 700 and 1000°C, allows it to simultaneously generate electricity and utilize waste heat for combined heat and power generation, achieving energy efficiency as high as 90%. A solid oxide electrolyzer (SOEC) is an electrochemical device that converts electrical and thermal energy into chemical energy, a reaction that is the reverse of the solid oxide fuel cell. As one of the main technologies for hydrogen production through water electrolysis, SOECs typically operate at 700-850°C and achieve electrolysis efficiencies of 85% to 95%.

[0003] When solid oxide cells (SOCs) are working, multiple stacks are usually connected in series to form a stack group in order to increase their power generation capacity or hydrogen production output. However, due to manufacturing and assembly deviations in the stacks and fluid pipelines, the flow entering each stack is unevenly distributed, which greatly limits the utilization rate of the raw material fluid of the stack group.

[0004] Summary of the Invention

[0005] The purpose of the present invention is to provide an air flow distribution device and an electrochemical energy conversion device including the same, which reduces the percentage difference in pressure loss between each branch line of each fuel cell stack, thereby optimizing the flow deviation caused by the pressure loss deviation of the fuel cell stack and the fluid pipeline, thereby prompting each fuel cell stack to obtain an air flow with the same and stable flow rate, and ensuring the utilization rate of the raw material fluid of the fuel cell stack group.

[0006] In order to achieve the above-mentioned objectives, the present invention provides an air flow distribution device, including a main body, wherein the main body includes a first end face and a second end face arranged opposite to each other, an exhaust channel arranged through the first end face and / or the second end face is opened on the main body, and a pressure loss channel is also opened on the main body, and the two ends of the pressure loss channel are respectively connected to the exhaust channel and the outer wall of the main body.

[0007] Compared with the prior art, the air flow distribution device of the embodiment of the present invention has the following beneficial effects: a connected pressure loss channel and an exhaust channel are provided on the main body, and the fluid enters the main body from the inlet of the pressure loss channel, reaches the exhaust channel through the pressure loss channel, and then enters the fuel cell stack through the exhaust channel. By adding a pressure loss channel to the air flow uniform distribution device, and then sending the fluid with increased pressure loss into the fuel cell stack through the exhaust channel, the overall pressure loss of each fuel cell branch line can be greatly increased, and the percentage difference in pressure loss between each fuel cell branch line can be reduced, thereby optimizing the flow deviation caused by the pressure loss deviation of the fuel cell stack and the fluid pipeline, thereby prompting each fuel cell stack to obtain the same and stable flow of fluid, and ensuring the utilization rate of the raw material fluid of the fuel cell stack group.

[0008] In the air flow distribution device according to the embodiment of the present invention, the equivalent diameter D1 of the cross section of the pressure loss channel is in the range of 0.5 mm to 20 mm.

[0009] In the air flow distribution device of the embodiment of the present invention, the length L of the pressure loss channel satisfies the following range: 500*D1≥L≥25*D1.

[0010] In the air flow distribution device according to the embodiment of the present invention, the range of the equivalent diameter D2 of the cross section of the exhaust channel satisfies: 20*D1≥D2≥D1.

[0011] In the air flow distribution device of the embodiment of the present invention, an air flow distribution chamber is formed in the main body, and the pressure loss channel is connected to the exhaust channel through the air flow distribution chamber.

[0012] In the air flow distribution device of an embodiment of the present invention, in the height direction, the main body is a first cross-section at the intersection of the air flow equalizing chamber and the pressure loss channel. The cross-sectional area of ​​the first cross-section is assumed to be S2, and the cross-sectional area of ​​the pressure loss channel is assumed to be S1. S1 and S2 satisfy: 5<S2: S1<100.

[0013] In the air flow distribution device of the embodiment of the present invention, the volume V1 of the air flow distribution chamber and the volume V2 of the main body satisfy the following relationship: 1 / 15≤V1 / V2≤1 / 6.

[0014] In the air flow distribution device of the embodiment of the present invention, an air inlet channel is provided at one end of the main body away from the exhaust channel, and the air inlet channel is connected to the air outlet chamber.

[0015] In the air flow distribution device of an embodiment of the present invention, an ear seat is formed on the outer side wall of the main body, and the ear seat includes an air inlet ear seat and an air outlet ear seat. The air inlet ear seat and the air outlet ear seat each include an ear seat body and a hollow vent formed in the ear seat body. The air outlet chamber is connected to the hollow vent of the air outlet ear seat, and the boost loss channel is connected to the hollow vent of the air inlet ear seat.

[0016] The present invention also provides an electrochemical energy conversion device, comprising at least one fuel cell stack and the air flow distribution device described in any one of the above embodiments, wherein the fuel cell stack and the air flow distribution device are stacked, the fuel cell stack abuts against the first end face or the second end face of the air flow distribution device, the exhaust channel of the air flow distribution device is connected to the air flow inlet of the fuel cell stack, and the air intake channel of the air flow distribution device is connected to the air flow outlet of the fuel cell stack.

[0017] Compared with the prior art, the electrochemical energy conversion device of an embodiment of the present invention has the following beneficial effects: the electrochemical energy conversion device of the present application realizes the integration of the air intake and outlet of the fuel cell stack in an airflow uniform distribution device, with high integration, small space occupation and low cost. At the same time, by adding a pressure loss channel to the airflow uniform distribution device, the fluid with increased pressure loss is sent into the fuel cell stack through the exhaust channel, thereby achieving uniform airflow distribution of multiple fuel cells in the electrochemical energy conversion device, and improving the ability of the electrochemical energy conversion device to resist fluctuations in parameters such as airflow flow, current, calorific value, and temperature.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is an external schematic diagram of an air flow distribution device according to an embodiment of the present invention;

[0020] FIG2 is a schematic internal view of an air flow distribution device according to an embodiment of the present invention, with one outermost plate removed;

[0021] FIG3 is an exploded schematic diagram of an air flow distribution device according to an embodiment of the present invention;

[0022] FIG4 is a bottom view schematically showing the internal structure of an air flow distribution device according to an embodiment of the present invention, with the other outermost plate removed;

[0023] FIG5 is a schematic cross-sectional view taken along line AA in FIG4 ;

[0024] FIG6 is an external schematic diagram of an air flow distribution device according to another embodiment of the present invention;

[0025] 7 is a bottom view schematically showing the internal structure of an air flow distribution device with one outermost plate removed according to another embodiment of the present invention;

[0026] FIG8 is an external schematic diagram of an air flow distribution device according to another embodiment of the present invention;

[0027] FIG9 is a schematic internal cross-sectional view of an air flow distribution device according to another embodiment of the present invention;

[0028] FIG10 is a schematic diagram of an explosion of an electrochemical energy conversion device according to an embodiment of the present invention.

[0029] In the figure, 1. main body; 11. connecting pipe; 12. sealing part; 13. first end face; 14. second end face; 2. exhaust channel; 3. boost loss channel; 4. airflow distribution chamber; 41. first cross section; 5. air inlet channel; 6. air outlet chamber; 7. ear seat; 71. ear seat body; 72. hollow vent; 73. air inlet ear seat; 74. air outlet ear seat; 8. fuel cell stack; 81. airflow inlet; 82. airflow outlet; 9. airflow inlet duct; 10. airflow outlet duct; X, length direction; Y, width direction; Z, height direction. DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] As shown in Figures 1 and 10, an airflow distribution device according to a preferred embodiment of the present invention includes a main body 1, which is in the shape of a flat plate and includes a first end face 13 and a second end face 14 disposed opposite each other. An exhaust channel 2 is defined in the main body 1 and extends through the first end face 13 and / or the second end face 14. It is understood that the exhaust channel 2 may extend through the first end face 13 or the second end face 14 in the height direction Z, or may extend through both the first end face 13 and the second end face 14 in the height direction Z, without specific limitation herein. The main body 1 also defines a pressure loss channel 3, which is horizontally disposed, i.e., extends in a horizontal plane defined by the length direction X and the width direction Y. Both ends of the pressure loss channel 3 extend to the outer sidewalls connecting the exhaust channel 2 and the main body 1. Fluid enters the main body 1 through the inlet of the pressure loss channel 3, passes through the pressure loss channel 3 to the exhaust channel 2, and then enters the fuel cell stack 8 through the exhaust channel 2. By adding a pressure loss channel 3 to the airflow uniform distribution device, and then sending the fluid with increased pressure loss into the fuel cell stack 8 through the exhaust channel 2, the overall pressure loss of each branch line of the fuel cell stack 8 can be greatly increased, and the percentage difference in pressure loss between the branch lines of each fuel cell stack 8 can be reduced, thereby optimizing the flow deviation caused by the pressure loss deviation of the fuel cell stack 8 and the fluid pipeline, thereby prompting each fuel cell stack 8 to obtain the same and stable airflow inflow, ensuring the raw material fluid utilization rate of the fuel cell stack group. Furthermore, one or more exhaust channels 2 can be provided. If one exhaust channel 2 is provided, it is provided on the main body 1 at one end of the pressure loss channel 3 close to the center of the main body 1. If multiple exhaust channels 2 are provided, they are preferably evenly and symmetrically distributed with the pressure loss channel 3 as the center. No specific limitation is made here.

[0035] As shown in Figures 2-5, in some embodiments of the present invention, the cross-section of the pressure loss channel 3, i.e., the equivalent diameter D1 of the cross-section of the pressure loss channel 3 in the height direction Z, ranges from 0.5 mm to 20 mm. The equivalent diameter D1 of the cross-section is 4*A / C, where A is the area of ​​the cross-section and C is the circumference of the cross-section. The equivalent diameter D1 of the cross-section of the pressure loss channel 3 directly affects the pressure loss effect. If D1 is less than 0.5 mm, the flow velocity of the fluid in the pressure loss channel 3 will be too high. When the fluid flow velocity exceeds 0.5 times the speed of sound, compressible fluid may be generated, resulting in unstable pressure loss in the pressure loss channel 3. If D1 is greater than 20 mm, the pressure loss effect of the pressure loss channel 3 is poor, and the ratio of the pressure loss in the pressure loss channel 3 to the pressure loss of the fuel cell stack 8 may be less than 5:1, resulting in poor fluid uniformity of the airflow distribution device, affecting the uniform and stable airflow of each fuel cell stack 8. It is understandable that the cross-section of the pressure loss channel 3 can be set to be circular or rectangular, and its equivalent diameter only needs to meet the above exemplary limitations, and no specific limitations are made here.

[0036] As shown in FIG7 , in some embodiments of the present invention, the range of the length L of the pressure loss channel 3 satisfies the following: 500*D1≥L≥25*D1. The ratio of the length of the pressure loss channel 3 to the equivalent diameter of its cross section can affect the pressure loss effect. When L<25*D1, the fluid may not completely lose pressure in the pressure loss channel 3, making the pressure loss effect of the pressure loss channel 3 unstable, and may also cause the pressure loss effect to be poor, further causing the ratio of the pressure loss in the pressure loss channel 3 to the pressure loss of the fuel cell stack 8 to be less than 5:1. At this time, the fluid uniform distribution effect of the airflow uniform distribution device is poor. When L>500*D1, the airflow pressure loss channel 3 is longer as a whole, occupies a large amount of the internal space of the airflow uniform distribution device, and is likely to interfere with other structural designs in the airflow uniform distribution device.

[0037] As shown in Figures 2-5, in some embodiments of the present invention, the range of the equivalent diameter D2 of the cross section of the exhaust channel 2 satisfies the following: 20*D1≥D2≥D1. The fluid needs to flow into the fuel cell stack 8 through the exhaust channel 2, so the equivalent diameter of the cross section of the exhaust channel 2 also needs to be controlled. If D2>20*D1, the cross section of the exhaust channel 2 is relatively large, and when the airflow distribution device and the fuel cell stack 8 are assembled, it is difficult to seal the exhaust channel 2 and the fuel cell stack 8, and fluid leakage is likely to occur. If D2<D1, the cross section of the exhaust channel 2 is relatively small, and the flow rate of the fluid passing through the exhaust channel 2 into the fuel cell stack 8 is too fast, which can easily cause uneven distribution of the fluid at the inlet of the fuel cell stack 8.

[0038] As shown in Figures 2-5, in some embodiments of the present invention, an airflow equalizing chamber 4 is formed in the main body 1, and the pressure loss channel 3 is connected to the exhaust channel 2 through the airflow equalizing chamber 4. After passing through the pressure loss channel 3, the airflow enters the airflow equalizing chamber 4, and then flows from the airflow equalizing chamber 4 into the exhaust channel 2. The airflow equalizing chamber 4 serves as a temporary accommodation for the fluid with increased pressure loss. It extends inside the main body 1 and on the horizontal plane and can form a variety of shapes, which are not specifically limited here. Multiple exhaust channels 2 can also be provided. Therefore, an airflow equalizing chamber 4 is provided between the outlet of the pressure loss channel 3 and the exhaust channel 2, so that the speed and airflow volume of the airflow entering each exhaust channel 2 can be relatively equal, thereby improving the fuel utilization rate in the fuel cell stack 8.

[0039] As shown in FIG2 , in some embodiments of the present invention, the cross-section of the main body 1 at the intersection of the pressure loss channel 3 and the gas distribution chamber 4 in the height direction Z is a first cross-section 41. That is, the first cross-section 41 is formed on a plane containing the width direction Y and the height direction Z. Let the cross-sectional area of ​​the first cross-section 41 be S2, and let the cross-sectional area of ​​the pressure loss channel 3, that is, the cross-sectional area of ​​the pressure loss channel 3 in the height direction Z, be S1. S1 and S2 satisfy the following relationship: 5 < S2 : S1 < 100. When S2 : S1 is less than 5, the difference between the cross-sectional areas of the first cross-section 41 and the pressure loss channel 3 is small, resulting in a small local pressure loss at the junction of the pressure loss channel 3 and the gas distribution chamber 4, and a poor effect in reducing pressure loss. When S2 : S1 is greater than 100, the difference between the cross-sectional areas of the first cross-section 41 and the pressure loss channel 3 is large, resulting in unstable fluid flow at the junction of the gas distribution chamber 4 and the pressure loss channel 3. Furthermore, the structure of the gas distribution chamber 4 is difficult to design, which can easily affect the configuration of other structures.

[0040] In some embodiments of the present invention, the volume V1 of the airflow equalizing chamber 4 and the volume V2 of the main body 1 satisfy the following relationship: 1 / 15≤V1 / V2≤1 / 6. The purpose of providing the airflow equalizing chamber 4 is to allow the airflow to enter each exhaust channel 2 more evenly after passing through the boost loss channel 3. If the airflow equalizing chamber 4 is too small relative to the volume of the main body 1, that is, when V1 / V2 is less than 1 / 15, the fluid flow rate in the airflow equalizing chamber 4 may be too fast, causing the Reynolds number of the fluid to be too large, and the local airflow in the airflow equalizing chamber 4 may develop into turbulence, unstable flow, and easily cause poor equalization effect, further affecting the airflow distribution in the fuel cell stack 8. When V1 / V2 is greater than 1 / 6, the airflow equalizing chamber 4 is too large relative to the volume of the main body 1, occupies most of the space in the main body 1, and is prone to interfere with other structures in the main body 1.

[0041] As shown in Figures 1 and 2, in some embodiments of the present invention, an air intake channel 5 is provided at one end of the main body 1 away from the exhaust channel 2, and the air intake channel 5 is connected to the air outlet chamber 6. The exhaust gas generated by the reaction of the battery stack 8 in the electrochemical energy conversion device can enter the main body 1 through the air intake channel 5, enter the air outlet chamber 6 in the main body 1, and then be discharged from the main body 1 through the air outlet chamber 6. The arrangement of the above structure enables the airflow uniform distribution device to not only play a role in distributing the airflow during air intake, but also to simultaneously play a role in collecting and discharging the exhaust gas generated by the reaction in the electrochemical energy conversion device. Specifically, the cross-section of the air intake channel 5 in the horizontal direction can be set to be circular or strip-shaped, depending on the shape of the exhaust pipe of the battery stack 8 to which it is connected.

[0042] As shown in Figures 1 and 2, in some embodiments of the present invention, the main body 1 includes an ear seat 7, which is formed by extending outward from the outer wall of the main body 1. The ear seat 7 includes an air inlet ear seat 73 and an air outlet ear seat 74. The outlet chamber 6 is connected to the hollow vent 72 of the air outlet ear seat 74, and the pressure loss channel 3 is connected to the hollow vent 72 of the air inlet ear seat 73, allowing the pressure loss channel 3 and the air outlet chamber 6 to communicate with the outside. The air inlet ear seat 73 and the air outlet ear seat 74 each include an ear seat body 71 and a hollow vent 72 formed within the ear seat body 71. Specifically, a portion of the pressure loss channel 3 is located within the ear seat body 71 of the air inlet ear seat 73, extending from the air flow equalizing chamber 4 to the hollow vent 72 of the air inlet ear seat 73. A portion of the air outlet chamber 6 is located within the ear seat body 71 of the air outlet ear seat 74, extending from the air inlet channel 5 to the hollow vent 72 of the air outlet ear seat 74.

[0043] As shown in Figures 1 and 2, in some embodiments of the present invention, the air inlet ear seat 73 and the air outlet ear seat 74 are symmetrically arranged on both sides of the main body 1, and the hollow vent portion 72 in the ear seat body 71 can be connected to the gas pipeline. The air outlet chamber 6 and the pressure loss channel 3 are respectively connected to the air outlet ear seat 74 and the air inlet ear seat 73, and an opening connected to the pressure loss channel 3 is provided on the inner side wall of the hollow vent portion 72 of the air inlet ear seat 73. By arranging the air outlet chamber 6 and the pressure loss channel 3 in the outwardly extending air outlet ear seat 74 and the air inlet ear seat 73, respectively, the length of the air outlet chamber 6 and the pressure loss channel 3 can be extended, so that the air outlet chamber 6 and the pressure loss channel 3 have sufficient length to ensure their exhaust or pressure loss functions.

[0044] As shown in Figures 6 and 7, in some embodiments of the present invention, the air inlet ear seat 73 and the air outlet ear seat 74 are arranged on the outer wall of the same side of the main body 1, and the air outlet chamber 6 and the pressure loss channel 3 are connected to the air outlet ear seat 74 and the air inlet ear seat 73 respectively. Compared with the embodiment shown in Figures 1-5 above, this embodiment arranges the inlet of the pressure loss channel 3 and the outlet of the air outlet chamber 6 on the same side to facilitate fluid circulation and recovery. In this case, the lengths of the air inlet ear seat 73 and the air outlet ear seat 74 on the same side are different. This is to prevent the air inlet duct 9 and the air outlet duct 10 from interfering with each other, and to facilitate distinguishing the air inlet channel 5 and the exhaust channel 2 during assembly.

[0045] As shown in Figures 1, 2 and 3, in some embodiments of the present invention, the main body 1 includes a plurality of plates of the same size, and the plurality of plates are stacked and connected to form the main body 1. In the above two embodiments, when the air outlet ear seat 74 and the air inlet ear seat 73 are provided for exhaust and air intake, the main body 1 is configured to be formed by stacking a plurality of plates. Since the structures such as the boost loss channel 3, the exhaust channel 2, the air inlet channel 5 and the air flow distribution chamber 4 in the air flow distribution device are all located inside the main body 1, if a single thick plate is used as the main body 1 of the air flow distribution device, it is difficult to process the aforementioned components located inside the main body 1. Therefore, certain processing can be performed on a plurality of plates, and these plates can be welded together to form an air flow distribution device. This configuration reduces the processing difficulty of the present application, saves a certain amount of processing cost, and improves a certain amount of processing efficiency.

[0046] As shown in Figures 8 and 9, in some embodiments of the present invention, the main body 1 is configured as a single-layer plate structure. The main body 1 configured as a single-layer plate structure can be processed by drilling to form structures such as the pressure loss channel 3, the exhaust channel 2, the intake channel 5, and the airflow distribution chamber 4. Specifically, the main body 1 includes at least two connecting pipes 11. One end of each connecting pipe 11 is connected to the pressure loss channel 3, and the other end is connected to the outer wall of the main body 1 and is provided with a sealing member 12. The two connecting pipes 11 form the airflow distribution chamber 4 within the main body 1. In this embodiment, an ear seat 7 can also be provided to accommodate the air outlet chamber 6 and the pressure loss channel 3. During processing, three holes are drilled in the shape of an arrow on the side of the main body 1 where the pressure loss channel 3 is to be provided. The hole in the middle is set according to the relevant settings of the pressure loss channel 3. The channel formed by the holes drilled on both sides serves as the airflow distribution chamber 4, and the channel formed by the holes drilled on both sides is sealed from the outside using the sealing member 12 to prevent air leakage during the intake process.

[0047] As shown in FIG10 , the present invention further provides an electrochemical energy conversion device, comprising at least one battery stack 8 and an airflow distribution device according to any of the above embodiments. The battery stack 8 and the airflow distribution device are stacked. The battery stack 8 can be provided as one, and one battery stack can abut against the first end face 13 or the second end face 14 to connect with the airflow distribution device. The battery stack 8 can also be provided as multiple, with multiple battery stacks 8 stacked and an airflow distribution device provided between two adjacent battery stacks 8. The battery stack 8 abuts against the first end face 13 or the second end face 14 of the airflow distribution device to connect with the airflow distribution device. The exhaust channel 2 is connected to the airflow inlet 81 of the battery stack 8, and the air intake channel 5 is connected to the airflow outlet 82 of the battery stack 8. An air flow inlet duct 9 and an air flow outlet duct 10 are also provided on both sides of the fuel cell stack 8. The air flow flows into the boost loss channel 3 through the air flow inlet duct 9, and then enters the air flow equalization chamber 4 to control the flow rate and flow of the air flow. Then, after passing through the exhaust channel 2, the air flow flows into the fuel cell stack from the air flow inlet 81 to participate in the reaction. After the reaction, the air flow flows into the air flow inlet 81 from the air flow outlet 82 of the fuel cell stack, and then enters the air outlet chamber 6, and flows from the air outlet chamber 6 to the air flow outlet duct 10 for discharge.

[0048] The electrochemical energy conversion device of the present application realizes the integration of the air intake and outlet of the fuel cell stack 8 in an airflow uniform distribution device, with high integration, small space occupation and low cost. At the same time, by adding a pressure loss channel 3 to the airflow uniform distribution device, the airflow with increased pressure loss is sent into the fuel cell stack 8 through the exhaust channel 2, thereby achieving uniform airflow distribution of multiple fuel cells 8 in the electrochemical energy conversion device, and improving the ability of the electrochemical energy conversion device to resist fluctuations in parameters such as airflow flow, current, calorific value, and temperature.

[0049] The working process of the present invention is as follows: a connected boost loss channel 3 and an exhaust channel 2 are provided on the main body 1 of the airflow uniform distribution device. The airflow enters the main body 1 from the inlet of the boost loss channel 3, reaches the exhaust channel 2 through the boost loss channel 3, and then enters the fuel cell stack 8 through the exhaust channel 2 via the airflow inlet 81 of the fuel cell stack 8. The exhaust gas in the fuel cell stack 8 can enter the main body 1 through the airflow outlet 82 of the fuel cell stack 8 through the air intake channel 5, enter the air outlet chamber 6 in the main body 1, and then be discharged from the main body 1 through the air outlet chamber 6.

[0050] In summary, the embodiment of the present invention provides an air flow distribution device and an electrochemical energy conversion device thereof, which have high integration, small space occupation, low cost, reduce the percentage difference in pressure loss between the branch lines of each battery stack 8, achieve uniform distribution of air flow in multiple battery stacks 8 in the electrochemical energy conversion device, and improve the ability of the electrochemical energy conversion device to resist fluctuations in parameters such as air flow rate, current, calorific value, and temperature.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An air flow distribution device, characterized in that: It includes a main body, which includes a first end face and a second end face arranged opposite to each other, an exhaust channel arranged through the first end face and / or the second end face is opened on the main body, and a pressure loss channel is also opened on the main body, and the two ends of the pressure loss channel are respectively connected to the exhaust channel and the outer wall of the main body.

2. The air flow distribution device according to claim 1, characterized in that: The equivalent diameter D1 of the cross section of the pressure loss channel is in the range of 0.5 mm to 20 mm.

3. The air flow distribution device according to claim 2, characterized in that: The length L of the pressure loss channel satisfies the range of: 500*D1≥L≥25*D1.

4. The air flow distribution device according to claim 2, characterized in that: The range of the equivalent diameter D2 of the cross section of the exhaust passage satisfies: 20*D1≥D2≥D1.

5. The air flow distribution device according to claim 1, characterized in that: An airflow distribution chamber is formed in the main body, and the pressure loss channel is communicated with the exhaust channel through the airflow distribution chamber.

6. The air flow distribution device according to claim 5, characterized in that: In the height direction Z, the cross-section of the main body at the intersection of the airflow equalizing chamber and the pressure loss channel is set to the first cross-section, the cross-sectional area of ​​the first cross-section is set to S2, the cross-sectional area of ​​the pressure loss channel is set to S1, and S1 and S2 satisfy: 5<S2: S1<100.

7. The air flow distribution device according to claim 5, characterized in that: The volume V1 of the airflow distribution chamber and the volume V2 of the main body satisfy the following relationship: 1 / 15≤V1 / V2≤1 / 6.

8. The air flow distribution device according to claim 1, characterized in that: An air inlet passage is disposed at one end of the main body away from the exhaust passage, and the air inlet passage is connected to the air outlet chamber.

9. The air flow distribution device according to claim 8, characterized in that: The main body includes an ear seat, and the ear seat includes an air inlet ear seat and an air outlet ear seat. The air inlet ear seat and the air outlet ear seat both include an ear seat body and a hollow vent formed in the ear seat body. The air outlet chamber is communicated with the hollow vent of the air outlet ear seat, and the boost loss channel is communicated with the hollow vent of the air inlet ear seat.

10. An electrochemical energy conversion device, characterized in that: It comprises at least one battery stack and the air flow distribution device according to any one of claims 1 to 9, wherein the battery stack and the air flow distribution device are stacked, the battery stack abuts against the first end face or the second end face of the air flow distribution device, the exhaust channel of the air flow distribution device is connected to the air flow inlet of the battery stack, and the air intake channel of the air flow distribution device is connected to the air flow outlet of the battery stack.

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