A connector for a solid oxide fuel cell or electrolyzer

Abstract

This invention relates to a connector for a solid oxide fuel cell or electrolyzer, comprising a body with opposing anode and cathode surfaces. Multiple oblique flow channels for gas flow are uniformly etched on both surfaces, intersecting with each other. This allows for cross-flow of anodic gas from the anode and cathode surfaces, resulting in a uniform temperature distribution within the cell. The connector for the solid oxide fuel cell or electrolyzer according to this invention has a simple structure, with parallel oblique flow channels exhibiting uniform friction resistance. It avoids complex flow channel structures such as S-shapes or serpentine shapes, enabling effective thermal management of the cell and stack, reducing the number of hot spots, preventing excessive temperature gradients, reducing thermal stress, and extending stack life. Furthermore, it eliminates the risk of gas eddies or cavities at bends, while simultaneously increasing current density and improving cell performance.

Description

Technical Field

[0001] This invention relates to fuel cells or electrolyzers, and more specifically to a connector for a solid oxide fuel cell or electrolyzer. Background Technology

[0002] Solid oxide fuel cells (SOFCs) are devices that can directly convert the chemical energy in fuel and oxidant into electrical energy at high temperatures (500–1000°C). Solid oxide fuel electrolysis cells (SOECs) are the reverse reaction of SOFCs, which can use electrical energy to electrolyze and generate small-molecule fuel gases. They have advantages such as high energy conversion efficiency, zero pollution, wide adaptability to fuels, wide range of applications, high long-term stability, and no need for precious metals as catalysts. They are one of the most promising fuel cells for achieving efficient and environmentally friendly power generation and hydrogen production and carbon reduction, and are of great significance to the sustainable development of society.

[0003] SOFC / SOEC mainly consists of an anode, electrolyte, cathode, connector, and seals. The connector has two main functions: first, to connect the individual cells and transfer electrons, thereby increasing the output voltage, current, and power; second, to isolate the fuel gas on the anode side and the oxidizing gas on the cathode side, and to distribute the materials entering the individual cells. The connector operates in a harsh environment, requiring high electrical conductivity, excellent thermal conductivity, oxidation resistance, anti-fluidization, and anti-carbon deposition properties, as well as good mechanical properties.

[0004] The long-term, efficient operation of SOFC / SOEC systems depends on maintaining the thermal balance of the fuel cell stack. Excessive temperature gradients within the stack can lead to excessive thermal stress on the cells, causing deformation and cracking, thus affecting the stack's long-term lifespan. In actual operation, changes in operating conditions inevitably require changes in output power, and the reactant flow rate, temperature, and degree of electrochemical reaction will also fluctuate drastically, resulting in changes in the heat released and causing temperature fluctuations in the stack. A common method for managing and controlling the stack's thermal balance is through material flow for heat exchange and removal; however, gas flow can affect the internal temperature distribution of the stack.

[0005] The connector has dedicated flow channel areas on both the top and bottom sides for material distribution. The rationality and uniformity of material distribution on the battery surface affect the temperature distribution and performance inside the battery stack. Therefore, a cleverly designed connector structure and a reasonable gas channel distribution can achieve lower thermal stress, increase the uniformity of reactant distribution and gas concentration at the reaction interface, and improve battery power and fuel utilization.

[0006] CN112397743A discloses a solid oxide fuel cell connector, which has an internal flow channel parallel to the air-side flow channel for cooling gas to pass through. However, the additional introduction of cooling gas into the connector increases the energy consumption of the blower in the fuel cell stack system and reduces the overall system efficiency.

[0007] CN115000455A discloses a solid oxide fuel cell connector, in which the sidewall of the venting groove and all the long ribs form a serpentine flow channel. By varying the number and arrangement of long and short ribs within each flow channel section of the serpentine flow channel, a gradient flow channel structure is formed where the number of airflow channels gradually decreases according to the airflow direction. However, this structure is complex, hindering manufacturing, and the flow field distribution of each cell in the stack is not consistent. Different numbers of long and short ribs must be used for different layers in the stack, increasing the difficulty of battery manufacturing and limiting its prospects for large-scale commercial application. Furthermore, the serpentine flow channel increases airflow resistance, affecting battery performance and lifespan.

[0008] CN116454309A discloses a connector for solid oxide fuel cells (SOFCs). This connector features multiple sets of S-shaped parallel flow channels. For SOFCs with internal reforming fuels, the design of multiple parallel short-flow channels enables distributed utilization of reforming heat, reducing heat absorption concentration and improving the uniformity of internal temperature distribution. The purpose of setting multiple sets of S-shaped parallel flow channels is to provide reaction sites for internal methane reforming. However, the application of this connector is limited; it can only be used in SOFCs with internal methane reforming and cannot take full advantage of the wide applicability of SOFC fuels. Furthermore, the S-shaped flow channels increase the friction loss along the flow path, especially for methane-fueled SOFCs, which are prone to carbon buildup. Carbon buildup is even more likely at the corners of the S-shaped flow channels, significantly impacting battery performance, lifespan, and safety.

[0009] Furthermore, in the existing technology, the flow channels on both the upper and lower sides of the connector are parallel direct-flow channels, and the fuel and air flow in the same or opposite directions, which cannot improve the location and number of hot spots. Summary of the Invention

[0010] To address the problems in the prior art where SOFCs or SOECs using DC-channel connectors may experience localized thermal stress leading to battery failure during operation, this invention provides a connector for a solid oxide fuel cell or electrolyzer.

[0011] The connector of the solid oxide fuel cell or electrolyzer according to the present invention has a body with opposing anode and cathode surfaces. Multiple oblique flow channels for gas flow are uniformly engraved on both the anode and cathode surfaces. The oblique flow channels on the anode and cathode surfaces intersect, causing the anolyte gas on the anode and cathode surfaces to flow in a cross-flow pattern, thereby achieving a uniform cell temperature distribution. It should be understood that the oblique flow channels on the anode and cathode surfaces do not actually intersect; that is, while their projections on a certain plane may intersect, this intersection does not actually exist in three-dimensional space. The oblique flow channels engraved on the anode and cathode surfaces do not penetrate each other; they are arranged at a certain angle on different planes without directly intersecting.

[0012] Preferably, the inclination angle of the inclined channel on the anode surface is complementary to the inclination angle of the inclined channel on the cathode surface.

[0013] Preferably, the anode surface and the cathode surface are each composed of symmetrical first and second parts, and the inclination angle of the inclined channel of the first part and the inclination angle of the inclined channel of the second part are axially symmetrical.

[0014] Preferably, the anode gas flows to the upper left and upper right along the inclined channel on the anode surface, and the cathode gas flows to the lower left and lower right along the inclined channel on the cathode surface, with the flow directions of the anode gas and cathode gas exhibiting a diamond-shaped oblique intersection.

[0015] Preferably, the body has a through air inlet and outlet hole, and a flow collection area is engraved on the inner edge of the air inlet and outlet hole towards the battery. A distribution groove is engraved on the periphery of the battery edge and the middle position of the connector. The flow collection area is connected to the distribution groove, and the two ends of the inclined flow channel are connected to the distribution groove.

[0016] Preferably, the body has raised ribs formed by engraved oblique flow channels, flow collection areas and distribution grooves.

[0017] Preferably, the anode and cathode surfaces are distributed with seven gas distribution grooves, and the two ends of the inclined flow channel are connected to four gas distribution grooves.

[0018] Preferably, the body has eight fluid modules.

[0019] Preferably, the air inlet and outlet ports include an air inlet located in the middle of one side and two air outlet ports located at both ends of the other side.

[0020] Preferably, a baffle is provided at the intersection of some of the distribution slots to prevent airflow from flowing directly from the air inlet along the distribution slots to the air outlet.

[0021] The connector of the solid oxide fuel cell or electrolyzer according to the present invention has a simple structure, with parallel inclined flow channels and uniform friction resistance within the flow channels. It avoids complex flow channel structures such as S-shaped or serpentine shapes, enabling effective thermal management of the battery and battery stack, reducing the number of hot spots in the battery, avoiding excessive temperature gradients in the battery, reducing thermal stress in the battery, and extending the life of the battery stack. Moreover, it eliminates the risk of gas eddies and cavities at bends, while also increasing the current density of the battery and improving battery performance. Attached Figure Description

[0022] Figure 1 This is a perspective view of the connector of a solid oxide fuel cell or electrolyzer according to a preferred embodiment of the present invention.

[0023] Figure 2 yes Figure 1 Top view.

[0024] Figure 3 yes Figure 1 A bottom view.

[0025] Figure 4 yes Figure 1 Perspective view.

[0026] Figure 5 The temperature distribution of the connector in a conventional DC channel is shown.

[0027] Figure 6 The temperature distribution of the connector of the oblique flow channel of the present invention is shown.

[0028] Figure 7 The temperature difference between the connector of a conventional DC channel and the connector of the oblique flow channel of the present invention is shown.

[0029] Figure 8 The diagram shows a comparison of the average current density of the connector for a conventional DC channel and the connector for a slanted flow channel of the present invention. Detailed Implementation

[0030] The preferred embodiments of the present invention are given below with reference to the accompanying drawings and described in detail.

[0031] like Figures 1-4As shown, the connector of a solid oxide fuel cell or electrolyzer according to a preferred embodiment of the present invention has a rectangular plate-shaped body 1, which has opposing rectangular top and bottom surfaces. The top surface is the anode surface, for the flow of anode gas. The bottom surface is the cathode surface, for the flow of cathode gas. At the location where the battery is placed, multiple inclined channels, i.e., several parallel inclined channels 10, are uniformly engraved on the anode and cathode surfaces. The anode and cathode surfaces are respectively composed of symmetrical first and second parts. The inclination angle of the inclined channel 10 in the first part and the inclination angle of the inclined channel 10 in the second part are axially symmetrical, so that the length of the battery channel is controlled within a shorter range, because a longer channel is not conducive to the exhaust of gas. The inclined channels 10 are straight channels, of different lengths, but with the same or complementary inclination angles, forming parallel channels. In this way, the gas flow on the anode surface and the gas flow on the cathode surface flow in a diamond-shaped cross flow, thereby achieving a uniform battery temperature distribution and improving battery performance. In this embodiment, each oblique flow channel 10 has a rectangular cross-section, and each oblique flow channel 10 has an inclination angle of 45°. It should be understood that this inclination angle is only an example and not a limitation; for example, setting it to 30°-60° is feasible.

[0032] For ease of description, the directions are up, down, left, and right. Since the connector is placed horizontally during use, its up and down position is not affected by gravity; the directions are used for descriptive purposes only.

[0033] The body 1 has a through first anode vent 3, a second anode vent 4 and an anode inlet 5, wherein the first anode vent 3 is located at the upper left corner of the body 1, the second anode vent 4 is located at the upper right corner of the body 1, and the anode inlet 5 is located at the middle and lower edge of the body 1.

[0034] The body 1 has a through first cathode vent 6, a second cathode vent 7, and a cathode inlet 8. The first cathode vent 6 is located at the lower left corner of the body 1, the second cathode vent 7 is located at the lower right corner of the body 1, and the cathode inlet 8 is located at the middle and upper edge of the body 1.

[0035] like Figure 2 As shown, on the anode surface, flow collection areas 9, 21, and 22 are engraved on the inner edges of the anode inlet / outlet holes 3, 4, and 5 towards the battery. Distribution grooves 11, 15, 16, 17, 18, 19, and 20 are engraved around the battery edge and in the middle of the connector, forming seven distribution grooves in total: right, upper left, upper right, left, lower left, and lower right. The body 1, through the engraved oblique flow channel 10, flow collection areas 9, 21, and 22, and distribution grooves 11, 15, 16, 17, 18, 19, and 20, forms a raised rib 2 (see...). Figure 1Ribs 2 not only evenly distribute the gas but also collect the current generated by the battery. The two ends of the inclined flow channel 10 are connected to four distribution gas channels 11, 15, 16, 17, 18, 19, and 20. Baffles 12 are installed at the intersection of distribution gas channels 11 and 19; baffles 13, which partially close the channels, are installed at the intersection of distribution gas channels 15, 16, and 20; and baffles 14 are installed at the intersection of distribution gas channels 17 and 18. Except for the locations of baffles 12, 13, and 14, all other intersections of distribution gas channels 11, 15, 16, 17, 18, 19, and 20 are interconnected.

[0036] The anode gas flows in through the anode inlet 5, first flows into the first collection area 22 to collect and fully mix the gas, and then flows to the left, right and upward through the distribution gas grooves 18, 19 and 20. During the flow, due to the gas pressure, it enters the inclined channel 10 along the way one by one.

[0037] Gas entering the first distribution tank 18 flows along the upper left direction through the left inclined channel 10, and enters the second distribution tank 17 at the end of the channel; gas entering the third distribution tank 19 flows along the upper right direction through the right inclined channel 10, and enters the fourth distribution tank 11 at the end of the channel; gas entering the fifth distribution tank 20 can either enter the left inclined channel 10 and flow along the upper left direction to the sixth distribution tank 15, or enter the right inclined channel 10 and flow along the upper right direction to the seventh distribution tank 16; the gas in the second distribution tank 17 and the sixth distribution tank 15 merges into the second collection area 21, and is finally discharged from the connector through the first anode outlet 3; the gas in the fourth distribution tank 11 and the seventh distribution tank 16 merges into the third collection area 9, and is finally discharged from the connector through the second anode outlet 4.

[0038] Due to the first baffle plate 14, the gas in the first distribution channel 18 cannot directly enter the second distribution channel 17; due to the second baffle plate 12, the gas in the third distribution channel 19 cannot directly enter the fourth distribution channel 11; and due to the third baffle plate 13, the gas in the fifth distribution channel 20 cannot directly enter the sixth and seventh distribution channels 15 and 16. This design avoids gas short-circuiting. Even if the gas chooses the path of least resistance to flow directly from the inlet to the outlet along the distribution channels without passing through the dense, oblique flow channels with higher resistance, considering the current collection effect of the fins, the flow channels must be narrow and dense. Therefore, baffle plates are needed to force the gas into the oblique flow channels to contact the battery active surface for electrochemical reaction.

[0039] like Figure 3As shown, on the cathode surface, flow collection areas 33, 34, and 35 are engraved on the inner edges of the cathode inlet / outlet holes 6, 7, and 8 towards the battery. Distribution grooves 23, 24, 25, 26, 27, 28, and 29 are engraved around the battery edge and in the middle of the connector, forming seven distribution grooves: upper right, upper left, left, lower left, center, lower right, and right. The body 1, through the engraved oblique flow channel 10, flow collection areas 33, 34, and 35, and distribution grooves 23, 24, 25, 26, 27, 28, and 29, forms a raised rib 2 (see...). Figure 1 Rib 2 serves to evenly distribute the gas while also collecting the current generated by the battery. The two ends of the inclined flow channel 10 are connected to four distribution gas channels 23, 24, 25, 26, 27, 28, and 29. Baffles 30 are installed at the intersection of distribution gas channels 23 and 29, baffles 31 are installed at the intersection of distribution gas channels 24 and 25, and baffles 32, which partially close the gas channels, are installed at the intersection of distribution gas channels 26, 27, and 28. Except for the locations of baffles 30, 31, and 32, all other intersections of distribution gas channels 23, 24, 25, 26, 27, 28, and 29 are interconnected.

[0040] When the connector is in use, the gas flow pattern is the same on the cathode surface and the anode surface, but the flow direction is opposite.

[0041] The cathode gas flows in through the anode inlet 8, first flowing into the fourth collection area 34 to collect and fully mix the gas, and then flowing to the left, right and downward through the distribution gas grooves 23, 24 and 27. During the flow, due to the gas pressure, it enters the inclined channel 10 along the way one by one.

[0042] Gas entering the eighth distribution tank 24 flows down the left through the inclined channel 10 and enters the ninth distribution tank 25 at the end of the channel; gas entering the tenth distribution tank 23 flows down the right through the inclined channel 10 and enters the eleventh distribution tank 29 at the end of the channel; gas entering the twelfth distribution tank 27 can either enter the left through the inclined channel 10 and flow down the left to the thirteenth distribution tank 26, or enter the right through the inclined channel 10 and flow down the right to the fourteenth distribution tank 28; gas in the ninth and thirteenth distribution tanks 25 and 26 merge into the fifth collection area 35 and is finally discharged from the connector through the first cathode outlet 7; gas in the eleventh and fourteenth distribution tanks 29 and 28 merge into the sixth collection area 33 and is finally discharged from the connector through the second cathode outlet 6.

[0043] The fourth baffle 31 prevents the gas in the eighth distribution gas tank 24 from directly entering the ninth distribution gas tank 25; the fifth baffle 30 prevents the gas in the tenth distribution gas tank 23 from directly entering the eleventh distribution gas tank 29; and the sixth baffle 32 prevents the gas in the twelfth distribution gas tank 27 from directly entering the thirteenth distribution gas tank 26 and the fourteenth distribution gas tank 28.

[0044] like Figure 4 As shown, during use, the anode gas flows along the inclined flow channel 10 to the upper left and upper right on the anode surface, while the cathode gas flows along the inclined flow channel 10 to the lower left and lower right on the cathode surface. The flow directions of the anode and cathode gases form a diamond-shaped oblique intersection. This intersecting flow pattern enhances heat exchange between the gases on both sides, reduces thermal stress, and improves battery life. Furthermore, due to the arrangement of the inclined flow channel 10 and the distribution gas slots 11, 15, 16, 17, 18, 19, 20, 23, 24, 25, 26, 27, 28, and 29, the gas flow spontaneously forms eight flow plates. This shortens the gas flow displacement, reduces the probability of no gas at the end of the flow channel, makes the material distribution in the battery more uniform, and improves battery performance.

[0045] Using multiphysics numerical simulation, the thermoelectric performance of the connector of the oblique flow channel 10 of this invention and the connector of a conventional direct flow channel were compared under the same conditions. The results are as follows:

[0046] Figure 5 Using a conventional DC-DC connector, with three inlet and three outlet ports for both the anode and cathode, in SOEC mode, with cathode gas (80% water vapor and 20% hydrogen) and anode gas (air) flowing counter-currently at 1073 K, the temperature distribution at the fuel electrode is as follows: The temperature is higher at the inlet. As the electrochemical reaction for hydrogen production via water electrolysis proceeds, this endothermic reaction causes the battery temperature to gradually decrease along the direction of water vapor flow. Hot spots are concentrated at the fuel gas inlet, with a maximum temperature of 1071.5 K, while the lowest temperatures are concentrated at the upper left and upper right corners, with a minimum temperature of 916.93 K. The temperature difference between the fuel and anode is 154.57 K, and the maximum temperature gradient is 26618 K / m.

[0047] Figure 6Using the oblique flow channel connector of this invention, the temperature distribution of the battery fuel electrode is observed in SOEC mode when cathode gas (80% water vapor and 20% hydrogen) and anode gas (air) at 1073 K are introduced. Because the anode and cathode gases flow in a diamond-shaped cross-flow pattern, the battery temperature distribution is no longer clearly distinguished by the inlet and outlet. Hot spots are concentrated at the left and right edges, exhibiting a symmetrical distribution, with the highest temperature at 1071.9 K. The lowest temperature is concentrated in the center of the battery, with a minimum temperature of 1070 K. The temperature difference between the fuel electrode and the anode is 1.9 K, and the maximum temperature gradient is 1841.8 K / m.

[0048] like Figure 7 As shown, compared with the connection using a DC channel, the maximum temperature difference is reduced by 98% and the maximum temperature gradient is reduced by 93%. The temperature distribution of the battery using the connection using an oblique flow channel is significantly more uniform, and the corresponding thermal stress is greatly reduced, which can improve the stability and service life of the battery.

[0049] Using oblique flow channels can also improve battery performance. For example... Figure 8 As shown, when using the DC channel, the average current density of the battery is 597.61 A / m. 2 When using an oblique flow channel, the average current density of the battery is 686.69 A / m. 2 Battery performance is improved by 13%.

[0050] This invention employs an oblique flow channel, addressing the problem that existing connectors are all parallel direct-flow channels, limiting flow to either co-current or counter-current methods. This results in a gradual decrease in fuel concentration and velocity within the flow channel, leading to a large temperature gradient at the tail end and causing localized thermal stress that can cause battery failure. The cross-flow of this invention reduces hot spots, achieving a more uniform temperature distribution and improving battery performance. While cross-flow in the stack can be achieved via direct-flow channels by rotating each layer of the connectors by 90 degrees during stack assembly, this only allows for vertical cross-flow and is limited to cubic batteries, restricting its application. In rectangular batteries, this limitation prevents encapsulation, thus restricting rectangular batteries to co-current or counter-current methods. This invention allows for cross-flow application with a single connector, regardless of battery shape; it can be used in square or any rectangular battery, broadening the application scope of cross-flow. Furthermore, the diamond-shaped cross-flow structure not only enables vertical cross-flow but also extends to cross-flow structures at any angle.

[0051] Compared to existing connectors, preliminary verification results through numerical simulations demonstrate that the oblique connector of this invention has an excellent effect on achieving uniform temperature distribution. Simultaneously, it also improves battery performance, achieving a synergistic enhancement of the battery's thermoelectric properties.

[0052] Compared to existing connectors designed to improve battery temperature distribution, the connector structure of this invention is simple, with parallel oblique flow channels and no S-shaped or serpentine flow channels. Therefore, it eliminates the risk of gas vortices or cavities at bends. Furthermore, it eliminates secondary airflow, allowing for more efficient use of air for thermal management and improving the overall efficiency of the battery system.

[0053] This invention achieves a synergistic enhancement of the thermoelectric performance of the battery. Because the connector of this invention allows the cathode and anode gases to flow in a diamond-shaped oblique cross configuration, the temperatures of the air and fuel gas can interweave and complement each other. The air can maintain a temperature difference with the fuel gas at multiple points, enhancing the convective heat transfer effect. Temperature changes caused by the electrochemical reaction can be carried away by the air more promptly and in greater quantities. Therefore, unlike previous batteries where the temperature gradually rises (in SOFC) or falls (in SOEC) with the flow of fuel gas, the temperature distribution of the battery is more uniform. When the battery temperature distribution is more uniform, the high-efficiency electrochemical reaction zone is larger, thus improving battery performance to a certain extent.

[0054] This invention expands the application range and intersection angle range of crossflow patterns. Because the inclined channel connector of this invention has an adjustable tilt angle and can divide a rectangle into different flow zones, it can be applied not only to square batteries but also to any rectangular battery. Furthermore, due to the rhomboid intersection structure, based on the geometric characteristics of a parallelogram, the two airflows can not only achieve perpendicular intersection but also extend to intersection structures at any angle.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Various variations can be made to the above embodiments of the present invention. That is, all simple and equivalent changes and modifications made based on the claims and description of this invention fall within the protection scope of the claims of this patent. All aspects not described in detail in this invention are conventional technical content.

Claims

1. A solid oxide fuel cell or electrolyzer, comprising at least two single cells and a connector disposed between adjacent single cells to connect the single cells, wherein each single cell includes an anode, an electrolyte, and a cathode, characterized in that, The connector has a body with opposing anode and cathode surfaces. Multiple parallel oblique channels for gas flow are uniformly engraved on the anode and cathode surfaces. The oblique channels on the anode and cathode surfaces have complementary inclination angles. They only intersect in planar projection but do not actually meet or penetrate in three-dimensional space. This allows the anode gas on the anode surface and the cathode gas on the cathode surface to flow in a diamond-shaped oblique cross, thereby achieving a uniform battery temperature distribution.

2. The solid oxide fuel cell or electrolyzer according to claim 1, characterized in that, The anode and cathode surfaces are composed of symmetrical first and second parts, respectively. The inclination angle of the inclined channel in the first part and the inclination angle of the inclined channel in the second part are axially symmetrical.

3. The solid oxide fuel cell or electrolyzer according to claim 1, characterized in that, The main body has a through air inlet and outlet. The inner edge of the air inlet and outlet is engraved with a flow collection area towards the battery. The perimeter of the battery and the middle of the connecting body are engraved with a distribution groove. The flow collection area is connected to the distribution groove. The two ends of the inclined flow channel are connected to the distribution groove.

4. The solid oxide fuel cell or electrolyzer according to claim 3, characterized in that, The body has raised ribs formed by engraved oblique flow channels, flow collection areas and distribution grooves.

5. The solid oxide fuel cell or electrolyzer according to claim 3, characterized in that, The anode and cathode surfaces are distributed with seven gas distribution channels, and the two ends of the inclined flow channel are connected to four gas distribution channels.

6. The solid oxide fuel cell or electrolyzer according to claim 5, characterized in that, The main body has eight fluid modules.

7. The solid oxide fuel cell or electrolyzer according to claim 3, characterized in that, The air inlet and outlet ports include an air inlet located in the middle of one side and two air outlet ports located at both ends of the other side.

8. The solid oxide fuel cell or electrolyzer according to claim 7, characterized in that, Baffles are installed at the intersection of some distribution slots to prevent airflow from flowing directly from the air inlet along the distribution slot to the air outlet.

Images