CN118039993A - Integrated electric pile - Google Patents

Abstract

The invention relates to the technical field of fuel cells and discloses an integratable electric pile, which comprises a pile body, wherein the pile body comprises a connecting body and a cell unit, and a cathode runner and an anode runner are respectively arranged on the connecting body; the connecting body is respectively provided with a first edge body surrounding the anode runner and a second edge body surrounding the cathode runner; an air inlet and an air outlet are formed in the first edge body; an air inlet side and an air outlet side are arranged in the second edge body; the opening of the first edge body and the opening of the second edge body on the adjacent connecting body are respectively abutted against the battery unit. The invention improves the reliability and the integrability of the electric pile, greatly reduces the design difficulty of the electric pile integration and improves the volume power ratio of the system integration.

Description

An integrated fuel cell stack

Technical Field

The present invention relates to the technical field of fuel cells, and in particular to an integrable fuel cell stack.

Background technique

Solid oxide fuel cell (SOFC) is a power generation device that directly converts the chemical energy in fuel into electrical energy cleanly and efficiently. In order to obtain the required voltage and power, the SOFC power generation system usually contains more than one fuel cell unit, and the fuel cell units are separated by connecting components, which also play an electrical connection role. After multiple layers are stacked, a SOFC stack is formed. As a new type of green power generation technology, SOFC has high energy conversion efficiency, safety and environmental protection, but SOFC needs to operate at a higher operating temperature. High temperature will reduce the service life and working efficiency of the SOFC system and stack. Therefore, the current trend in the industry is to develop low-temperature operating SOFC stacks.

Referring to FIG1 , in a SOFC stack, an air flow distribution manifold is usually used to provide the stack with the reaction gas required for operation. The reaction gas flow channels of a flat-plate SOFC stack are all internal distribution manifolds that penetrate the stack. For a stack using an internal distribution manifold, it is necessary to design separate gas and air pipelines for the stack. The air pipeline cannot be integrated, which will increase the complexity of system design and cause the weight and volume of the entire system to increase. In addition, during the operation of the SOFC stack, the stack requires a large air flow rate. When the air flows through the narrow internal flow channel of the stack, the pressure loss will increase with the increase in flow rate, resulting in an increase in the working pressure of the stack, thereby affecting the performance of the sealing material of the stack, reducing the service life and operating stability of the stack, and at the same time increasing the power load of the system air and reducing the system energy efficiency.

As shown in Figure 2, for SOFC stacks that use internal distribution manifolds for air circulation, air needs to be supplied from bottom to top or from top to bottom. The temperature of the air gradually increases during the journey from the air inlet of the stack to the air outlet of the stack due to the heating of the electrochemical reaction of the stack, which will cause a high temperature difference between the inlet and outlet of the stack, generate large stress, and easily cause the sealing material to fail. In addition, the large air sealing area will increase the difficulty of sealing the entire stack, which is not conducive to the long-term stable operation of the stack. As shown in Figure 2, air and gas have their own cavities inside the stack, which are independent and sealed from each other.

Referring to FIG3 , the current SOFC stack structure can be divided into two types: electrolyte support structure and anode support structure. The SOFC stack with an anode support structure has a thinner electrolyte diaphragm, which can reduce the ohmic loss caused by the electrolyte thickness and make the operating temperature lower than that of the electrolyte support structure. Compared with the stack with an anode support structure, the stack with an electrolyte support has higher requirements on the mechanical properties of the battery electrolyte layer, so it is necessary to increase the thickness of the electrolyte layer to enhance the rigidity of the battery cell, otherwise a series of problems such as stress concentration and fracture failure are likely to occur during operation. However, a thicker electrolyte layer also brings some problems. The increase in thickness will increase the ohmic loss of the battery, making its operating temperature higher than that of the anode support stack, and the high operating temperature will make the stack material more susceptible to failure. As shown in FIG3 , the cell area of the stack with an electrolyte support structure is basically equal to the area of the connector. Since the operating temperature of the stack with an electrolyte support structure is higher, this type of stack has higher requirements on sealing materials, and more stringent requirements on the materials and mechanical properties of the connector. Higher operating temperatures also mean higher system design difficulties.

Therefore, when developing a SOFC stack that operates at low temperatures, the first choice is to use a stack with an anode support structure.

Summary of the invention

The purpose of the present invention is to provide an integrable fuel cell stack, which improves the reliability and integrability of the fuel cell stack, greatly reduces the design difficulty of fuel cell stack integration, and improves the volume-to-power ratio of system integration.

In order to achieve the above-mentioned object, the present invention provides an integrable battery stack, including a stack body, the stack body including a plurality of spaced and stacked connectors, battery cells and sealing units are arranged between adjacent connectors, the connector includes a cathode side provided with an air flow channel and an anode side provided with a gas flow channel, the cathode side is arranged opposite to the cathode of the battery cell so as to provide a cathode flow channel for the cathode of a single battery, and the anode side is arranged opposite to the anode of the battery cell so as to provide an anode flow channel for the anode of a single battery; the connector is respectively provided with a first edge body arranged around the anode flow channel and a second edge body arranged around the cathode flow channel; wherein,

The area surrounded by the first edge body is provided with an air inlet and an air outlet for providing fuel gas to flow on the anode flow channel and penetrate the connector;

The second edge body is provided with an air inlet notch and an air outlet notch for communicating the external space of the stack body with the cathode flow channel, the air inlet notch is the air inlet side, and the air outlet notch is the air outlet side;

Two adjacent connectors are connected through the sealing unit, and the sealing unit includes a cover plate and a sealing frame for sealing the anode flow channel, one side of the cover plate is connected to one of the connectors through at least a portion of the sealing frame, and the other side of the cover plate is welded to the other connector, the cover plate is provided with a flow channel groove, a first through hole and a second through hole, the battery cell is arranged corresponding to the flow channel groove, and the battery cell is connected to the cover plate through a portion of the sealing frame, and two opposite surfaces of the battery cell along a first direction are respectively in contact with the flow channel convex strip of the cathode flow channel and the flow channel convex strip of the anode flow channel, wherein the first direction is the stacking direction of the adjacent connectors;

The cathode side is provided with a connecting sealing boss, and the outer peripheries of the air inlet and the air outlet are respectively surrounded by the connecting sealing bosses. The air inlet is connected to the first through hole through the connecting sealing bosses, and the air outlet is connected to the second through hole through the connecting sealing bosses.

Compared with the prior art, the integrable fuel cell stack of the embodiment of the present invention has the following beneficial effects: the integrable fuel cell stack improves the reliability and integrability of the fuel cell stack, greatly reduces the design difficulty of fuel cell stack integration, and improves the volume-to-power ratio of system integration; at the same time, it effectively solves the problem of excessive temperature difference in the ventilation type fuel cell stack inside the cathode, allowing a large amount of stable air to flow evenly through the cathode side of each layer of the connector, effectively solving the problems of sealing material failure and reduced fuel utilization caused by excessive temperature difference, and is very suitable for multi-fuel cell stack integration; by welding the connector and the cover plate, the use of sealing material is reduced, effectively alleviating the problem of sealing material failure.

In the integrable fuel cell stack of the embodiment of the present invention, one side of the cover plate is cooperatively connected to the anode side of one of the connectors through at least a portion of the sealing frame, and the other side of the cover plate is welded to the cathode side of the other connector.

In the integrated fuel cell stack of the embodiment of the present invention, the other side of the cover plate is welded only to the connecting sealing boss of the other connector, specifically: a first sealing surface is provided on the side of the cover plate facing the connecting sealing boss, and a boss welding surface is provided on the side of the connecting sealing boss facing the cover plate, and the first sealing surface is welded to the boss welding surface.

In the integrable fuel cell stack of the embodiment of the present invention, the connection sealing boss is annular, the diameter of the first through hole and/or the second through hole is D1, the outer diameter of the connection sealing boss is D2, and D1<D2.

In the integrable fuel cell stack of the embodiment of the present invention, the height of the connecting sealing boss is H1, the height of the second edge body is H2, and H1=H2.

In the integrated fuel cell stack of an embodiment of the present invention, the second edge body includes two second sub-edge bodies, the air inlet gap and the air outlet gap are formed between the two sub-edge bodies, the second sub-edge body includes a wing segment, a curved segment and a flat segment connected in sequence, the wing segment is parallel to the direction of the cathode flow channel, the flat segment is perpendicular to the direction of the cathode flow channel, and the curved segment connects the wing segment and the flat segment.

In the integrated battery stack of the embodiment of the present invention, the sealing frame includes a sealing outer frame and a sealing inner frame, the sealing outer frame is arranged along the first edge body, one side of the cover plate is sealed and connected to the first edge body of one of the connectors through the sealing outer frame, the sealing inner frame is arranged around the flow channel groove, the other side of the cover plate is welded to the other connector, and the battery cell is connected to the cover plate through the sealing inner frame.

In the integrable fuel cell stack of the embodiment of the present invention, one side of the cover plate is connected to the cathode side of one of the connectors through at least a portion of the sealing frame, and a rigid welding sealing layer is formed between the other side of the cover plate and the first edge body of the other connector by welding.

In the integrated battery stack of the embodiment of the present invention, the sealing frame includes a sealing boss ring, a sealing outer frame, a sealing inner frame and a pressure strip; the first through hole and the second through hole are sealedly connected to the connecting sealing boss through the sealing boss ring; one side of the cover plate is cooperatively connected to the cathode side of one of the connectors through the sealing outer frame; the sealing inner frame is arranged around the edge of the battery cell, and the sealing inner frame is connected to the sealing outer frame through the pressure strip.

In the integrated fuel cell stack of the embodiment of the present invention, the pressure strip extends along a gas flow direction perpendicular to the cathode flow channel, the second edge body is provided with a first groove and a second groove arranged opposite to each other, and the two ends of the pressure strip are respectively connected to the first groove and the second groove; the sealing outer frame includes a sealing frame and a sealing connecting strip, and the two ends of the sealing connecting strip are respectively connected to the two separated sealing frames; the sealing frame is arranged along the second edge body, and the sealing connecting strip is arranged along the pressure strip, one side of the cover plate is connected to the second edge body through the sealing frame, and one side of the cover plate is connected to the pressure strip through the sealing connecting strip; the sealing inner frame is connected to the sealing connecting strip through the pressure strip.

Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the integrated structure of an existing battery stack;

FIG2 is a schematic diagram of the internal air flow channel of a conventional fuel cell stack;

FIG3 is a schematic diagram of an electrolyte support structure of an existing battery stack;

FIG4 is a schematic diagram of the structure of an integrable fuel cell stack according to an embodiment of the present invention;

FIG5 is a partial exploded view of an integrable fuel cell stack according to an embodiment of the present invention;

FIG6 is a schematic structural diagram of a connector and a cover plate of an integrable battery stack according to an embodiment of the present invention;

7 is a schematic structural diagram of the anode side of the connector according to an embodiment of the present invention;

8 is a schematic structural diagram of the cathode side of the connector according to an embodiment of the present invention;

9 is a schematic structural diagram of a cathode flow channel according to an embodiment of the present invention;

FIG10 is a partially enlarged schematic diagram of the cathode side of an embodiment of the present invention;

11 is a schematic structural diagram of a cover plate according to an embodiment of the present invention;

FIG12 is a top view of a cover plate according to an embodiment of the present invention;

13 is a schematic diagram of the assembly structure of the cover plate welded to the first edge body according to an embodiment of the present invention;

14 is a schematic diagram of a disassembled structure of a cover plate welded to a first edge body according to an embodiment of the present invention;

15 is a schematic diagram of a split structure in which the cover plates of two adjacent connecting bodies are welded to the first edge body according to an embodiment of the present invention;

16 is a schematic structural diagram of a sealing frame in which a cover plate is welded to a first edge body according to an embodiment of the present invention;

17 is a schematic structural diagram of a cover plate welded to the cathode side of a first edge body according to an embodiment of the present invention;

FIG. 18 is a schematic diagram of the connection between the integrable fuel cell stack and the gas supply platform according to an embodiment of the present invention.

FIG. 19 is a schematic diagram of the state structure of step 1 of welding the cover plate and the connecting sealing boss according to an embodiment of the present invention.

FIG. 20 is a schematic diagram of the state structure of step 2 of welding the cover plate and the connecting sealing boss according to an embodiment of the present invention.

FIG. 21 is a schematic diagram of the state structure of step three of welding the cover plate and the connecting sealing boss according to an embodiment of the present invention.

FIG. 22 is a schematic diagram of the state structure of step four of welding the cover plate and the connecting sealing boss according to an embodiment of the present invention.

FIG. 23 is a schematic diagram of the state structure of step five of welding the cover plate and the connecting sealing boss according to an embodiment of the present invention.

FIG. 24 is an enlarged view of the structure at point B in FIG. 23 according to an embodiment of the present invention.

FIG. 25 is a schematic diagram of the state structure of step one of welding the cover plate and the first edge body according to an embodiment of the present invention.

FIG. 26 is a schematic diagram of the state structure of step 2 of welding the cover plate and the first edge body according to an embodiment of the present invention.

FIG. 27 is a schematic diagram of the state structure of step three of welding the cover plate and the first edge body according to an embodiment of the present invention.

FIG. 28 is an enlarged structural schematic diagram of point A in FIG. 27 according to an embodiment of the present invention.

FIG. 29 is a schematic diagram of the state structure of step four of welding the cover plate and the first edge body according to an embodiment of the present invention.

FIG. 30 is a schematic diagram of the state structure of step five of welding the cover plate and the first edge body according to an embodiment of the present invention.

FIG. 31 is a schematic diagram of the state structure of step six of welding the cover plate and the first edge body according to an embodiment of the present invention.

FIG. 32 is a schematic diagram of the state structure of step seven of welding the cover plate and the first edge body in an embodiment of the present invention.

FIG33 is an enlarged view of the structure at C in FIG32 of an embodiment of the present invention.

Reference numerals:

1. Stack; 2. Sealing unit; 21. Cell; 22. Cover plate; 225. First sealing surface; 23. Sealing frame; 231. Second sealing surface; 232. Sealing outer frame; 2321. First outer frame notch; 2322. Second outer frame notch; 2323. Sealing frame; 2324. Sealing connecting strip; 2325. Inner frame mounting groove; 233. Sealing inner frame; 234. Sealing boss ring; 221. First through hole; 222. Second through hole; 224. Flow channel groove; 3. Connector; 31. First edge body; 311. Air inlet; 312. Air outlet; 3 2. Second edge body; 321. Air inlet side; 322. Air outlet side; 323. Connecting sealing boss; 3231. Boss welding surface; 324. Wing section; 325. Bend section; 326. Flat section; 327. Second sub-edge body; 3271. Cathode bottom surface; 328. First groove; 329. Second groove; 4. Top plate; 5. Bottom plate; 6. Gas distribution platform; 61. Gas pipeline; 611. Gas channel; 6111. Gas inlet channel; 6112. Gas outlet channel; 62. Air pipeline; 621. Air channel; 8. Anode flow channel; 9. Cathode flow channel; 91. Pressure strip; 92. Flow channel convex strip.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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 in combination with the specific content of the technical solution.

As shown in FIGS. 4 to 13 , an integrable battery stack according to a preferred embodiment of the present invention comprises a stack body 1, the stack body 1 comprises a plurality of spaced and stacked connectors 3, battery cells 21 and sealing units 2 are arranged between adjacent connectors, the connector 3 comprises a cathode side provided with an air flow channel and an anode side provided with a gas flow channel, the cathode side of the connector 3 is arranged opposite to the cathode of the battery cell 21 so as to provide a cathode flow channel 9 for the cathode of the single battery, and the anode side of the connector 3 is arranged opposite to the anode of the battery cell 21 so as to provide an anode flow channel 8 for the anode of the single battery;

As shown in Fig. 6 to Fig. 9, the connector 3 is provided with a first edge body 31 surrounding the anode flow channel 8 and a second edge body 32 surrounding the cathode flow channel 9; as shown in Fig. 5, the battery cell 21 is located between two adjacent connectors 3, specifically, the battery cell 21 is located between the cathode side of one connector 3 and the anode side of another connector 3. Two opposite surfaces of the battery cell 21 along the first direction are respectively in contact with the flow channel ridge 92 of the cathode flow channel 9 and the flow channel ridge 92 of the anode flow channel 8, wherein the first direction is the stacking direction of adjacent connectors 3.

As shown in FIG7 , the area surrounded by the first edge body 31 is provided with an air inlet 311 and an air outlet 312 for providing gas to flow through the anode flow channel 8. The air inlet 311 and the air outlet 312 are respectively connected to the anode flow channel 8. The gas enters the anode flow channel 8 from the air inlet 311. The gas in the anode flow channel 8 contacts and reacts with the battery cell 21. The reacted gas is discharged from the air outlet 312.

As one of the embodiments, as shown in FIGS. 14 and 15 , the first edge body 31 is sealedly connected to the cover plate 22, and the flow channel groove 224 in the middle of the cover plate 22 is sealed by the battery cell 21 and the sealing frame 23, so that the anode side of the connector 3, the cover plate 22 and the battery cell 21 form a sealed gas reaction chamber, the opening of the anode flow channel 8 faces the battery cell 21, the gas enters the sealed gas reaction chamber from the air inlet 311, and reacts with the battery cell 21 through the anode flow channel 8, and the reacted gas is discharged from the gas outlet 312, so as to avoid gas leakage from the anode side, and at the same time, ensure that the gas fully reacts with the battery cell 21 on the anode side, thereby improving the reaction efficiency of the gas on the anode side and the battery cell 21.

As shown in FIG8 , the second edge body 32 is provided with an air inlet notch and an air outlet notch for communicating the external space of the stack body 1 with the cathode flow channel 9. The air inlet notch is the air inlet side 321, and the air outlet notch is the air outlet side 322. The air inlet side 321 and the air outlet side 322 are respectively connected to the cathode flow channel 9. The air enters the cathode flow channel 9 from the air inlet side 321. The air in the cathode flow channel 9 contacts and reacts with the battery cell 21. The air after the reaction is discharged from the air outlet side 322.

As one of the embodiments, as shown in Figures 5 and 6, the air inlet side 321 and the air outlet side 322 are open structures, and the flow channel groove 224 in the middle of the cover plate 22 is sealed by the battery cell 21 and the sealing frame 23, so that the cathode side of the connector 3, the cover plate 22 and the battery cell 21 form an air reaction chamber, the air inlet side 321 and the air outlet side 322 are respectively located on opposite sides in the horizontal direction and are connected to the outside, so that the air on the cathode side of each connector 3 enters the air reaction chamber from the air inlet side 321, the opening of the cathode flow channel 9 faces the battery cell 21, the air reacts with the battery cell 21 through the cathode flow channel 9, and the reacted air is discharged from the air outlet side 322, and the air flow direction in the air reaction chamber flows in a horizontal direction, so that the air flows evenly from the air inlet side 321 through the cathode flow channel 9 of each layer of the connector 3, the air reacts on the battery cell 21, and the generated waste gas is discharged from the air outlet side 322. Air flows directly into the stack body 1 from the front side of the stack body 1, i.e., the air inlet side 321. Since the air flow rate is much larger than the gas flow rate, and the air can flow evenly through the cathode side of each layer of the connector 3 of the stack body 1, the upper and lower temperature differences of the stack body 1 are more uniform than those of the prior art, thereby improving the reliability and integrability of the stack body 1. The gas distribution platform only needs to supply gas to the stack body 1, which greatly reduces the design difficulty of the stack body 1 integration and improves the volume-power ratio of the system integration. It effectively solves the problem of excessive temperature difference in the cathode internal ventilation type fuel cell stack, allowing a large amount of stable air to flow evenly through the cathode side of each layer of the connector 3 of the stack body 1, effectively solving the problems of failure of insulating sealing materials and reduced fuel utilization caused by excessive temperature difference, and is very suitable for multi-fuel stack integration.

As one of the embodiments, as shown in Figures 7 and 8, the connector 3 is an integrally formed structure, and the first edge body 31 and the second edge body 32 are part of the connector 3. The main function of the first edge body 31 and the second edge body 32 is to cooperate with the cover plate 22 to connect so that two sealed reaction chambers are formed on the cathode side and the anode side of the connector 3 respectively, thereby improving the sealing of the cathode flow channel 9 and the anode flow channel 8. At the same time, the second edge body 32 is provided with an air inlet side 321 and an air outlet side 322 for external air to flow directly on the cathode flow channel 9. In this way, air can flow in directly from the outside, and there is no need for the battery stack to provide a special air ventilation structure, which greatly simplifies the structure of the battery stack, improves its stability and reliability, and effectively solves the problem of excessive temperature difference in the ventilation type battery stack inside the cathode, allowing a large amount of stable air to flow evenly through the cathode side of each layer of the connector 3, effectively solving the problems of failure of sealing materials and reduced fuel utilization caused by excessive temperature difference, and is very suitable for multi-battery stack integration.

As shown in Figures 5 and 6, Figures 15 and 16, two adjacent connectors 3 are connected by a sealing unit 2, and the sealing unit 2 includes a cover plate 22 and a sealing frame 23, one side of the cover plate 22 is connected to one of the connectors 3 through at least a portion of the sealing frame 23, and the other side of the cover plate 22 is welded to the other connector 3, wherein the cover plate 22 is welded to the connector 3, the cover plate 22 is provided with a first sealing surface 225 facing the connector 3, and the sealing frame 23 is provided with a second sealing surface facing the connector 3, the first sealing surface 225 and the second sealing surface 231 are respectively connected to two different connectors 3, specifically, the first sealing surface 225 is connected to the first edge body 31 of one connector 3, and the second sealing surface 231 is connected to the second edge body 32 of the other connector 3; the first sealing surface 225 is connected to the second edge body 32 of one connector 3, and the second sealing surface 231 is connected to the first edge body 31 of the other connector 3. The cover plate 22 is provided with a flow channel groove 224, a first through hole 221 and a second through hole 222. The battery cell 21 is arranged corresponding to the flow channel groove 224, and the battery cell 21 is connected to the cover plate 22 through a part of the sealing frame 23. The flow channel groove 224 and the sealing frame 23 provide installation space for the battery cell 21. At the same time, the two opposite faces of the battery cell 21 in the first direction can be exposed and contact the anode flow channel 8 and the cathode flow channel respectively through the flow channel groove 224. Specifically, the first direction is the stacking direction of the adjacent connectors 3. The two opposite faces of the battery cell 21 along the first direction are respectively in contact with the flow channel convex strips 92 of the cathode flow channel 9 and the flow channel convex strips 92 of the anode flow channel 8, so that the two opposite faces of the battery cell 21 in the first direction are respectively in contact with the gas in the anode flow channel 8 and the air in the cathode flow channel 9 and react. The adjacent connectors 3 are sealed and isolated by the battery cell 21, the cover plate 22 and the sealing frame 23 to achieve the anode flow channel 8 and the cathode flow channel 9.

As shown in Figures 7 to 9 and 11, a connecting sealing boss 323 is provided on the cathode side, and the outer peripheries of the air inlet 311 and the air outlet 312 are respectively surrounded by connecting sealing bosses 323, the air inlet 311 is connected with the first through hole 221, and the air outlet 312 is connected with the second through hole 222, so that the gas enters the anode flow channel 8 from the air inlet 311 and flows out of the anode flow channel 8 from the air outlet 312, and the gas flows upward through the first through hole 221 to the next air inlet 311, and flows downward from the second through hole 222 to the next air outlet 312, so as to realize the circulation of the gas.

Among them, the gas flow spaces on the cathode side and the anode side of the connector 3 are isolated from each other, the cathode sides in the stack 1 are interconnected, and the anode sides are interconnected, ensuring that the fuel gas only flows at the anode of the battery cell 21 and the air only flows at the cathode of the battery cell 21.

The existing connection between the cathode side and the cover plate 22 is sealed by a soft insulating sealing material to avoid leakage of fuel on the cathode side. The stack is in a high-temperature condition during power generation. The soft insulating sealing material is easily deformed under long-term high-temperature conditions, causing fuel leakage on the cathode side. As shown in Figures 8-9 and 11, a connecting sealing boss 323 is provided on the cathode side, and the outer peripheries of the air inlet 311 and the air outlet 312 are respectively surrounded by connecting sealing bosses 323. When the first sealing surface 225 is connected to the second edge body 32, the connecting sealing boss 323 and the first sealing surface 225 are welded to form a rigid welding sealing layer. The two ends of the cathode flow channel 9 are respectively an air inlet side 321 and an air outlet side 322. The air inlet side 321 and the air outlet side 322 are respectively protruded with a connecting sealing boss 323. The connecting sealing boss 323 is welded with the cover plate 22 to form a rigid welding sealing layer. The connecting sealing boss 323 is a high temperature resistant metal material. The connecting sealing boss 323 is away from the anode side and protrudes toward the cover plate 22 to shorten the connection distance between the connector 3 and the cover plate 22. At the same time, the connecting sealing boss 323 and the cover plate 22 are connected by welding to form a rigid welding sealing layer. Since the connecting sealing boss 323 and the rigid welding sealing layer are resistant to high temperatures, they are not easily deformed in long-term high temperature conditions, thereby improving the connection sealing between the cathode side and the cover plate 22, preventing gas leakage on the cathode side, and reducing production costs. Among them, the welding method includes laser welding, brazing or argon arc welding.

Furthermore, one side of the cover plate 22 is connected to the anode side of one of the connectors 3 through at least a portion of the sealing frame 23, and the other side of the cover plate 22 is welded to the cathode side of the other connector 3, further improving the sealing of the cathode side and making the air flow in the cathode flow channel more uniform.

As one embodiment, the first sealing surface 225 is welded to the second edge body 32 and the boss welding surface 3231 respectively, so as to further improve the sealing performance of the cathode side and make the air flow in the cathode flow channel more uniform.

Further, as shown in Fig. 8-Fig. 9 and Fig. 11, one side of the cover plate 22 is only welded with the connection sealing boss 323 of another connector 3, specifically: the connection sealing boss 323 is annular, the connection sealing boss 323 is coaxially connected with the air inlet 311 and the first through hole 221 respectively, the connection sealing boss 323 is coaxially connected with the air outlet 312 and the second through hole 222 respectively, the first sealing surface 225 is the first welding surface of the cover plate 22 facing the connection sealing boss 323, and the connection sealing boss 323 is provided with a boss welding surface 3231 at one end facing away from the anode side and facing the cover plate 22, and the boss welding surface 3231 is welded with the first welding surface of the cover plate 22 to form a rigid welding sealing layer. The connector 3 is only sealed and welded with the cover plate 22 through the connection sealing boss 323, which can ensure the bonding strength between the cover plate 22 and the connector 3 on the one hand, prevent the gas from leaking from between the cover plate 22 and the boss welding surface 3231, and simplify the welding process on the other hand. The cover plate 22 abuts against the second edge body 32 , but no connection is formed.

As shown in FIG8 and FIG12, the diameter of the first through hole 221 or/and the second through hole 222 is D1, and the outer diameter of the connection sealing boss 323 is D2. If D1>D2, due to the excessive aperture of the first through hole 221 and the second through hole 222, the connection sealing boss 323 is even completely exposed, which increases the possibility of gas leakage on the cathode side, and the area required for welding is correspondingly increased, resulting in unnecessary waste. D1<D2, so that the projection of the cover plate 22 and the boss welding surface 3231 in the height direction has an overlapping part to form a welding area, and a rigid welding sealing layer is formed in the welding area to achieve a sealed connection between the cathode side and the cover plate, thereby avoiding gas leakage on the cathode side.

As a preferred embodiment, as shown in FIG8 and FIG12, although D1 can be smaller than D3, at this time, the diameter of the first through hole 221 and the second through hole 222 is smaller than the inner diameter of the connecting sealing boss 323, and the connecting sealing boss 323 has no exposed welding part relative to the cover plate 22, resulting in the need for welding by penetration welding, which is inconvenient for welding operation and also increases the welding difficulty and welding requirements. The inner diameter of the connecting sealing boss 323 is D3, D3≤D1＜D2, and the connecting sealing boss 323 exposes the boss welding surface 3231 relative to the cover plate, which is convenient for welding operation.

As one of the embodiments, as shown in Figure 10, the height of the connecting sealing boss 323 is H1, and the height of the second edge body 32 is H2, H1=H2. The height of the connecting sealing boss 323 is the same as that of the second edge body 32, ensuring that the air flows evenly in the cathode flow channel 9. If the heights of the two are not equal, on the one hand, it will lead to structural instability between the multiple spaced-together stacked connectors 3, battery cells 21 and cover plates 22, which may easily cause abnormal conditions such as tilting and gaps in the battery stack. On the other hand, due to the unequal heights of the two, the gap between the cathode side of the connector 3 and the cover plate 22 is larger, and air can pass through these gaps instead of through the air flow channel, affecting the air distribution inside the battery stack.

As one of the embodiments, as shown in Figures 8 and 9, the second edge body 32 includes a second sub-edge body mirror-set along the air flow direction, and an air inlet gap and an air outlet gap are formed between the two second sub-edge bodies; the second sub-edge body includes a wing section 324, a curved section 325 and a flat section 326 connected in sequence, the wing section 324 is parallel to the direction of the cathode flow channel 9, the flat section 326 is perpendicular to the direction of the cathode flow channel 9, the curved section 325 connects the wing section 324 and the flat section 326, reducing air leakage in the external flow channel stack, wherein the flat section 326 extends in a direction perpendicular to the air flow direction, the length of the flat section 326 is L, L ≥ 4mm, and the flat section 326 extends in a direction perpendicular to the air flow direction, extending the sealing area between the cathode side of the connector 3 and the cover plate 22, ensuring that the air on the cathode side flows along the set flow trajectory.

As one embodiment, as shown in FIG. 5 to FIG. 7 , the first edge body 31 is sealedly connected to the cover plate 22 via the sealing frame 23 , and the second edge body 32 is directly connected to the opposite surface of the cover plate 22 .

Furthermore, as shown in FIG5 , the sealing frame 23 includes a sealing outer frame 232 and a sealing inner frame 233. The sealing outer frame 232 is arranged along the first edge body 31. One side of the cover plate 22 is sealed and connected to the first edge body 31 of one of the connectors 3 through the sealing outer frame 232. The sealing inner frame 233 is arranged around the flow channel groove 224. The battery cell 21 is connected to the cover plate 22 through the sealing inner frame 233 to achieve isolation of the cathode flow channel 9 and the anode flow channel 8. The sealing outer frame 232 forms a sealed gas space between the anode side and the cover plate 22 to prevent gas leakage and improve safety of use.

It is worth noting that the insulating sealing material can be glass or ceramic material, and the battery stack is sealed by pre-installation and sintering. The sealing material can also be high-temperature sealing material such as vermiculite, mica or silicate, and the battery stack is sealed by pre-compression of the material.

It is worth noting that the connector 3 can be a high-temperature resistant metal material, and the high-temperature metal includes an iron-based alloy, a nickel-based alloy or other metal alloys with high-temperature oxidation resistance, such as SUS 310s, SUS 316s, SUS 444, SUS 420, inconel600, inconel 625 and GH 3030; the battery cell 21 adopts YSZ material.

As one embodiment, as shown in FIG5 , the cover plate 22 is sealed and connected to the first edge body 31 through a sealing frame 23, wherein the sealing frame 23 is an insulating sealing material, and the connection between the sealing frame 23 and the anode side of the connector 3 and the cover plate 22 is a non-rigid connection, further preventing the leakage of the gas on the anode side. The insulating sealing material includes: glass, mica, vermiculite, ceramics, etc.

Further, as shown in FIGS. 13-14 and 16, one side of the cover plate 22 is connected to the cathode side of one of the connectors 3 through at least part of the sealing frame 23, and the other side of the cover plate 22 is welded to the first edge body 31 of the other connector 3. As one embodiment, a rigid welding sealing layer is formed between the first sealing surface 225 and the first edge body 31 by welding. The cover plate 22 is fixedly connected to the anode side of the connector 3 by direct welding, which can also avoid the operation of sealing the cover plate 22 and the anode side of the connector 3 using insulating sealing materials, reducing costs, and no gaps will be generated when slight deformation occurs under high temperature conditions, solving the problem of gas leakage from around the connector 3 due to deformation of the insulating sealing material under high temperature conditions. At the same time, the bonding strength between the cover plate 22 and the connector 3 after welding is guaranteed, and the gas leakage from the mating surface area of the cover plate 22 and the first edge body 31 is prevented. Direct welding methods include laser welding, brazing, and argon arc welding.

Further, as shown in FIG. 15 , when the cover plate 22 is fixedly connected to the anode side of the connector 3 by direct welding, the cover plate 22 is connected to the cathode side of the connector 3 by an insulating sealing material. Specifically, the cover plate 22 is connected to the connection sealing boss 323 and the second edge body 32 by insulating sealing materials, respectively, to further prevent gas leakage. The connection between the insulating sealing material and the cathode side of the connector 3 and the cover plate 22 is a non-rigid connection to ensure good sealing. Among them, the insulating sealing material includes: glass, mica, vermiculite or ceramics.

Further, as shown in FIG. 11 and FIG. 15-17, the sealing frame 23 includes a sealing boss ring 234, a sealing outer frame 232, a sealing inner frame 233 and a pressure strip 91. The first through hole 221 and the second through hole 222 are sealed and connected to the sealing boss 323 through the sealing boss ring 234 to prevent the gas on the anode side from leaking out. The sealing outer frame 232 is sealed and connected to the second edge body 32 to ensure that the air on the cathode side flows along the set air flow channel to ensure the air distribution in the battery stack. One side of the cover plate 22 is connected to the cathode side of one of the connectors 3 through the sealing outer frame 232. The sealing inner frame 233 is arranged around the edge of the battery cell 21, and the sealing inner frame 233 is connected to the sealing outer frame 232 through the pressure strip 91. Specifically, a first outer frame notch 2321 and a second outer frame notch 2322 are respectively provided on opposite sides of the sealing outer frame 232. The position of the first outer frame notch 2321 corresponds to the position of the air inlet side 321, and the first outer frame notch 2321 is connected to the air inlet side 321. The position of the second outer frame notch 2322 corresponds to the position of the air outlet side 322, and the second outer frame notch 2322 is connected to the air outlet side 322 to avoid the insulating sealing material from blocking the air flow channels of the air inlet side 321 and the air outlet side 322, thereby ensuring the normal circulation of the air flow channels.

Preferably, the shape and size of the first outer frame notch 2321 are set corresponding to the shape and size of the air inlet side 321, and the shape and size of the second outer frame notch 2322 are set corresponding to the shape and size of the air outlet side 322 to ensure that the air intake and exhaust volume are in a normal state. The sealing inner frame 233 surrounds the edge of the battery cell 21 and is connected to the outer periphery of the battery cell 21. The cathode side of the connector 3 presses the battery cell 21 through the sealing inner frame 233 to seal the anode flow channel 8 to prevent the gas on the anode side from leaking out. Specifically, the pressure strip 91 presses the sealing inner frame 233 and the sealing outer frame 232 toward the anode side, and the sealing inner frame 233 presses the battery cell 21 to seal the anode flow channel 8. The anode flow channel 8 is sealed by the cover plate 22, the sealing outer frame 232, the sealing inner frame 233 and the battery cell 21. Among them, the upper surface of the pressure strip 91 is flush with the upper surface of the second edge body 32.

Further, as shown in FIG17 , the pressure strip 91 extends in a direction perpendicular to the air flow direction of the cathode flow channel 9. The pressure strip 91 is connected to the cathode side, and the two ends of the pressure strip 91 perpendicular to the air flow are respectively connected to the cathode side. The sealing frame 23 is pressed toward the anode side by the side of the pressure strip 91 facing the anode side, and the other side of the pressure strip 91 forms an air flow gap with the cathode side. The air inlet side 321, the air flow gap, the cathode flow channel and the air outlet side 322 are connected. By setting the pressure strip 91, the sealing frame 23 is prevented from blocking the air flow channel on the cathode side, so that the air flow channel remains unobstructed. As one embodiment, the pressure strip 91 is made of a hard material.

As one of the embodiments, the second edge body is provided with a first groove and a second groove which are arranged opposite to each other, and the two ends of the pressure strip are respectively connected to the first groove and the second groove; the sealing outer frame 232 includes a sealing frame 2323 and a sealing connecting strip 2324, and the two ends of the sealing connecting strip 2324 are respectively connected to the two separated sealing frames 2323; the sealing frame 2323 is arranged along the second edge body 32, and the sealing connecting strip 2324 is arranged along the pressure strip 91, one side of the cover plate 22 is connected to the second edge body 32 through the sealing frame 2323, and one side of the cover plate 22 is connected to the pressure strip 91 through the sealing connecting strip 2324; the sealing inner frame 233 is connected to the sealing connecting strip 2324 through the pressure strip 91.

In some embodiments of the present invention, as shown in FIG. 15 , a flow channel groove 224 is provided on the cover plate 22, and the battery cell 21 is installed on the flow channel groove 224. There is a gap between the outer periphery of the battery cell 21 and the flow channel groove 224 to avoid short circuit caused by connection with the cover plate 22. Specifically, a flow channel groove 224 is provided in the middle of the cover plate 22, and the battery cell 21 is sealed with the flow channel groove 224 of the cover plate 22 through a sealing frame 23, so that one side of the battery cell 21 contacts the gas in the anode flow channel 8, and the other side contacts the air in the cathode flow channel 9, which not only ensures the progress of the electrochemical reaction, but also ensures the stable installation of the battery cell 21; the outer side of the cover plate 22 is sealed with the outer side of the connector 3 through a sealing frame 23, separating the anode side cavity and the cathode side cavity, forming an independent anode side cavity for gas circulation.

It is worth noting that the cover plate 22 can be a high temperature resistant metal material, and the high temperature metal includes iron-based alloy, nickel-based alloy or other metal alloys with high temperature oxidation resistance, such as SUS 310s, SUS 316s, SUS 444, SUS 420, inconel 600, inconel 625 and GH 3030.

It is worth noting that the flow channel and gas distribution area of the connector 3 are processed by mechanical processing, powder metallurgy or etching to improve the position accuracy of the flow channel and the gas distribution area and achieve the effect of uniform gas distribution; the cover plate 22 is processed by laser cutting or mechanical processing.

In some embodiments of the present invention, as shown in Figure 14, the air inlet 311 and the air outlet 312 are opened on the connecting body 3; wherein, the cover plate 22 is provided with a first through hole 221 and a second through hole 222, the air inlet 311 is connected to the first through hole 221, the air outlet 312 is connected to the second through hole 222, the air inlets 311 on adjacent connecting bodies 3 are connected after passing through the first through hole 221 of the cover plate 22, and the air outlets 312 on adjacent connecting bodies 3 are connected after passing through the second through hole 222 of the cover plate 22. Specifically, by directly arranging the air inlet 311 and the air outlet 312 on the connector 3, the structure of the fuel cell stack can be greatly simplified, and the air inlets 311 and the air outlets 312 between adjacent connectors 3 are connected and respectively connected after passing through the cover plate 22 to form a fuel gas supply passage of the stack 1, thereby ensuring the internal connectivity distribution of the fuel gas, simplifying the structure while ensuring the feasibility of the internal structure, and also highlighting the role of the cover plate 22 in the internal structure arrangement, that is, it can install the battery cell 21 stably, realize the sealing of the anode side and the cathode side of the connector 3, and also facilitate the distribution and connection of the internal gas ports between the connectors 3.

In some embodiments of the present invention, as shown in FIG4 , a top plate 4 is provided at the top of the stack body 1, and a bottom plate 5 is provided at the bottom of the stack body 1. The bottom plate 5 is provided with a third air inlet connected to the air inlet 311 and the first through hole 221, and a third air outlet connected to the air outlet 312 and the second through hole 222. Specifically, the top plate 4 and the bottom plate 5 can reasonably distribute the gas, so that the gas can reach each layer of the connector 3 evenly, improve the fuel utilization rate of the stack, and can also enhance the overall rigidity of the stack, so that the stack is easy to carry and move. There are tooling clamping holes on the bottom plate 5 and the top plate 4 of the stack to facilitate the transportation of the stack. The top plate 4 and the bottom plate 5 of the stack are also used as electrical connection interfaces for power supply. During use, the third air inlet of the bottom plate 5 is connected to the air supply port of the external gas distribution platform 6, and the third air outlet is connected to the exhaust port of the external gas distribution platform 6, so that the gas distribution platform 6 can be used to supply gas to the inside of the stack and ensure reasonable distribution.

In some embodiments of the present invention, as shown in FIG8-9, an air inlet notch and an air outlet notch are provided in the second edge body 32 for communicating the external space of the stack body 1 with the cathode flow channel 9, the air inlet notch is the air inlet side 321, the air outlet notch is the air outlet side 322, and the air inlet side 321 and the air outlet side 322 are arranged opposite to each other. Specifically, the air inlet side 321 and the air outlet side 322 are provided on the second edge body 32 for external air to directly enter and circulate on the cathode flow channel 9, further simplifying the structure of the stack and improving its stability and reliability. Furthermore, the air inlet side 321 and the air outlet side 322 are respectively arranged on the two side walls of the second edge body 32 in the form of grooves.

In some embodiments of the present invention, as shown in FIG4 , the stack body 1 includes 5 to 200 connectors 3. Specifically, a stack with less than 5 connectors is too small, which is not conducive to integrated development and has a low energy density. A stack with more than 200 connectors has poor performance in assembly, fluid distribution, temperature management, etc., which can easily cause the overall efficiency of the stack to decrease, and will cause the tolerance of the stack inclination to be too large, which is not conducive to the stacking and integration of multiple stacks.

In some embodiments of the present invention, as shown in Figures 7 to 9, the aspect ratio of the connector 3 is 0.5 to 4, and the lengths of the cathode flow channel 9 and the anode flow channel 8 are 20 to 120 mm, respectively. Specifically, if the lengths of the cathode flow channel 9 and the anode flow channel 8 are less than 20 mm, the reaction rate will be insufficient, resulting in a decrease in the fuel utilization rate of the fuel cell stack; if the lengths are greater than 120 mm, the gas pressure loss will increase.

In some embodiments of the present invention, as shown in FIG. 7 to FIG. 9 , the number of the air inlet 311 and the air outlet 312 is no more than eight, and they are provided in various shapes. Specifically, the more the number of the air inlet 311 is, the more favorable the gas distribution is. Since the design of the cathode flow channel 9 side of the connector 3 needs to be taken into consideration, the number of the air inlet 311 should not exceed 8.

Referring to Figure 18, the working process of the present invention is: placing the battery stack on the gas distribution platform 6, aligning the air supply port and the exhaust port on the gas distribution platform 6 with the air inlet 311 and the air outlet 312 of the battery stack respectively, and adding sealing material for sealing, and sealing the insulating material on the side of the battery stack and avoiding the air inlet side 321 and the air outlet side 322. The insulating material is silicate, alumina or mica, etc., preferably a soft material, and then put an outer cover on the battery stack so that the insulating material is tightly attached between the inner wall of the outer cover and the battery stack, and finally seal the top and bottom of the outer cover.

Fuel gas is introduced into the fuel cell stack through the gas distribution platform 6, and sufficient air with a sufficient temperature is introduced into the bottom of the gas distribution platform 6. The air will flow evenly through the cathode flow channel 9 of each layer of the connector 3 from the front side of the fuel cell stack, i.e., the air inlet side 321, and react electrochemically with the anode fuel gas inside the fuel cell stack to generate exhaust gas which is discharged from the back side of the fuel cell stack, i.e., the air outlet side 322.

The installation process of the present invention:

In the first embodiment, the cover plate 22 is welded to the connecting sealing boss 323 .

As shown in Figure 19, the cathode side of the connector 3 faces upward, wherein the flow channel protrusion 92 protrudes from the cathode bottom surface 3271 and is arranged along the air flow direction, and the flow channel protrusion 92 is arranged at intervals on the cathode side to form a cathode flow channel 9, and the cathode bottom surface 3271 of the connector 3 is connected to four connecting sealing bosses 323 distributed at both ends of the cathode flow channel 9, wherein two connecting sealing bosses 323 are located on the air inlet side 321, and the other two connecting sealing bosses 323 are located on the air outlet side 322, wherein two connecting sealing bosses 323 are respectively arranged around the air inlet port 311 to form a gas inlet channel 6111, and the other two connecting sealing bosses 323 are respectively arranged around the air outlet port 312 to form a gas outlet channel 6112.

As shown in Fig. 6, Fig. 12, Fig. 19 and Fig. 20, the first through hole 221 of the cover plate 22 is connected to the gas inlet channel 6111, the second through hole 222 is connected to the gas outlet channel 6112, the first sealing surface 225 of the cover plate 22 faces the cathode side, and the edge area of the first through hole 221 and the edge area of the second through hole 222 in the first sealing surface 225 are respectively welded to the four boss welding surfaces 3231 connected to the sealing boss 323. The cathode flow channel 9 is exposed through the flow channel groove 224 to form a contact reaction area with the battery cell 21. The second edge body 32 is raised relative to the cathode bottom surface 3271 and abuts against the first sealing surface 225. An air inlet gap and an air outlet gap are formed between the two second sub-edge bodies 327. The air inlet gap, the cathode flow channel 9 and the air outlet gap are connected to form an air channel, so that air flows along the air channel.

As shown in FIG21 , a sealing frame 23 is connected above the cover plate 22. Specifically, the sealing frame 23 includes a sealing outer frame 232 and a sealing inner frame 233. The sealing outer frame 232 is sealed around the edge of the cover plate 22, and the sealing inner frame 233 is sealed around the edge of the flow channel groove 224, so that the cathode flow channel 9 is exposed in the middle of the sealing inner frame 233, thereby forming a contact reaction area of the battery cell 21.

As shown in FIG22 , the battery cell 21 is connected to the sealed inner frame 233, the edge of the battery cell 21 is connected to the sealed inner frame 233, and the middle of the battery cell 21 is in contact with the air of the cathode flow channel 9 through the contact reaction area of the battery cell 21. The isolation of the cathode side and the anode side is achieved by installing the cover plate 22, the sealing frame 23 and the battery cell 21 on the connector 3.

As shown in Fig. 7, Fig. 19, and Fig. 22-24, the anode side of the next connector 3 is connected toward the sealing frame 23, and the air inlet 311 and the air outlet 312 of the connector 3 are respectively connected to the gas inlet channel 6111 and the gas outlet channel 6112. Among them, the first edge body 31 is arranged around the edge of the anode side, and the first edge body 31 is correspondingly arranged and sealed with the sealing outer frame 232. The anode flow channel 8 faces the battery cell 21 to achieve the sealing of the anode side. The gas enters between the cover plate 22 and the anode side through the air inlet 311, and the gas flows out from the air outlet 312 after reacting with the battery cell 21 through the anode flow channel 8.

The connector 3 , the cover plate 22 , and the sealing frame 23 are assembled in sequence according to the connection methods shown in FIGS. 19 to 23 to achieve welding assembly of the cover plate 22 and the connecting sealing boss 323 .

In the second embodiment, the cover plate 22 is welded to the first edge body 31 .

As shown in Figure 25, the difference from Figure 19 is that a first groove 328 and a second groove 329 are respectively provided on both sides of the second edge body 32 perpendicular to the air flow direction, and the bottom surfaces of the first groove 328 and the second groove 329 are higher than the cathode bottom surface 3271, wherein the first groove 328 and the second groove 329 are respectively provided at both ends of the cathode flow channel 9.

As shown in FIG. 26, on the basis of FIG. 25, the pressure strip 91 extends along the air flow direction perpendicular to the cathode flow channel 9, and the two ends of the pressure strip 91 are respectively connected to the first groove 328 and the second groove 329 to fix the pressure strip 91. There is an air flow gap between the lower end surface of the pressure strip 91 and the cathode bottom surface 3271, so that the air inlet gap, the air flow gap, the cathode flow channel 9 and the air outlet gap are connected in sequence to form an air channel. The upper end surface of the pressure strip 91 is flush with the upper end surface of the second sub-edge body 327. Pressure strips 91 are respectively connected at both ends of the cathode flow channel 9. The cathode flow channel 9 is surrounded by the pressure strip 91 and the second sub-edge body 327 to expose the contact reaction area of the battery cell 21.

As shown in Figures 27 and 30, the sealing frame 23 includes a sealing inner frame 233, a sealing outer frame 232 and a sealing boss ring 234. The long side of the sealing inner frame 233 is connected to the upper end surface of the pressure strip 91, and the short side of the sealing inner frame 233 is connected to the upper end surface of the second sub-edge body 327. The sealing inner frame 233 is arranged around the cathode flow channel 9, and the cathode flow channel 9 is exposed to form a contact reaction area of the battery cell 21.

As shown in FIG. 27 , FIG. 28 is an enlarged view of point A in FIG. 27 . It can be clearly seen from FIG. 28 that an air flow gap is formed between the bottom surface of the pressure strip 91 and the bottom surface 3271 of the cathode.

As shown in Figure 29, the battery cell 21 is connected to the sealed inner frame 233, the edge of the battery cell 21 is connected to the sealed inner frame 233, one side of the battery cell 21 faces the cathode channel 9, and contacts the air in the cathode channel 9 through the contact reaction area of the battery cell 21.

As shown in FIG30, based on FIG29, the sealing outer frame 232 includes a sealing frame 2323 and a sealing connection strip 2324. The shape of the sealing frame 2323 corresponds to the shape of the second sub-edge body 327. The two sealing frames 2323 are mirrored along the air flow direction. The two sealing frames 2323 are connected by two sealing connection strips 2324. The sealing frame 2323 and the sealing connection strip 2324 enclose an inner frame mounting groove 2325. The battery cell 21 and the sealing inner frame 233 are located in the inner frame mounting groove 2325. The sealing frame 2323 is connected to the upper end surface of the second sub-edge body 327. The sealing connection strip 2324 is connected to the upper end surface of the pressure strip 91. The shape of the sealing boss ring 234 corresponds to the connection sealing boss 323. The sealing boss ring 234 is connected to the connection sealing boss 323. The battery cell 21 is exposed through the inner frame mounting groove 2325 to form a contact reaction area of the battery cell 21.

As shown in Figure 31, the second sealing surface 231 is connected to the sealing outer frame 232, the battery cell 21 is exposed through the flow channel groove 224, and the first through hole 221 and the second through hole 222 of the cover plate 22 are respectively connected to the gas inlet channel 6111 and the gas outlet channel 6112, thereby isolating the cathode side from the anode side of the next connector 3.

As shown in FIG. 32 and FIG. 33 , the edge of the first sealing surface 225 of the cover plate 22 is welded to the first edge body 31 on the anode side of the next connector 3 to achieve a sealed connection on the anode side.

The connecting body 3 , the cover plate 22 , and the sealing frame 23 are assembled in sequence according to the connection methods shown in FIGS. 25 to 33 to achieve welding assembly of the cover plate 22 and the first edge body 31 .

It should be noted that the dotted arrows indicate the direction of air flow, and the solid arrows indicate the direction of gas flow.

In summary, the embodiment of the present invention provides an integrable fuel cell stack, and the gas distribution platform 6 only needs to supply fuel gas to the fuel cell stack, which reduces the design difficulty. The air flow channel design is directly exposed, and the air flows directly into the fuel cell stack from the front of the fuel cell stack. Since the air flow rate is much greater than the fuel gas flow rate, and the air can flow evenly through each layer of the fuel cell stack connector 3, the upper and lower temperature difference of the fuel cell stack is more uniform than the prior art, which improves the reliability and integrability of the fuel cell stack, and the gas distribution platform 6 only needs to supply fuel gas to the fuel cell stack, which greatly reduces the design difficulty of fuel cell stack integration and improves the volume power ratio of system integration; effectively solves the problem of excessive temperature difference of the internal ventilation fuel cell stack of the cathode, allowing a large amount of stable air to flow evenly through the cathode side of each layer of connector 3, effectively solving the problems of sealing material failure and reduced fuel utilization caused by excessive temperature difference, and is very suitable for multi-fuel cell integration.

The above are only preferred embodiments 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 (10)

1. An integratable electric pile comprises a pile body, wherein the pile body comprises a plurality of connecting bodies stacked at intervals, a battery piece and a sealing unit are arranged between the adjacent connecting bodies, the connecting bodies comprise a cathode side provided with an air flow channel and an anode side provided with a fuel gas flow channel, the cathode side is arranged opposite to the cathode of the battery piece so as to provide a cathode flow channel for a single battery cathode, and the anode side is arranged opposite to the anode of the battery piece so as to provide an anode flow channel for the single battery anode;

It is characterized in that the method comprises the steps of,

The connecting body is respectively provided with a first edge body arranged around the anode runner and a second edge body arranged around the cathode runner; wherein,

An air inlet and an air outlet which are used for providing fuel gas to circulate on the anode runner and penetrate through the connecting body are arranged in the area surrounded by the first edge body;

an air inlet gap and an air outlet gap which enable the outer space of the pile body to flow with the cathode runner are arranged in the second edge body, the air inlet gap is an air inlet side, and the air outlet gap is an air outlet side;

Two adjacent connectors are connected through the sealing unit, the sealing unit comprises a cover plate and a sealing frame, one side of the cover plate is connected with one connector in a matched manner through at least one part of the sealing frame, the other side of the cover plate is welded with the other connector, the cover plate is provided with a runner through groove, a first through hole and a second through hole, the battery piece is correspondingly arranged with the runner through groove and is connected with the cover plate through one part of the sealing frame, and two opposite surfaces of the battery piece along a first direction are respectively abutted against a runner convex strip of the cathode runner and a runner convex strip of the anode runner, wherein the first direction is the stacking direction of the adjacent connectors;

The cathode side is provided with a connecting sealing boss, the peripheries of the air inlet and the air outlet are respectively surrounded by the connecting sealing boss, the air inlet is communicated with the first through hole through the connecting sealing boss, and the air outlet is communicated with the second through hole through the connecting sealing boss _.

2. The integrable galvanic pile of claim 1, wherein: one side of the cover plate is connected with the anode side of one of the connectors in a matched manner through at least one part of the sealing frame, and the other side of the cover plate is welded with the cathode side of the other connector.

3. The integrable galvanic pile of claim 2, wherein: the other side of the cover plate is only welded with the connecting sealing boss of the other connecting body, and the connecting sealing boss is specifically: the cover plate is provided with a first sealing surface towards one side of the connecting sealing boss, a boss welding surface is arranged on one side of the connecting sealing boss towards the cover plate, and the first sealing surface is welded with the boss welding surface.

4. An integrable galvanic pile according to claim 3, characterised in that: the connecting sealing boss is annular, the diameter of the first through hole or/and the diameter of the second through hole are D1, and the outer diameter of the connecting sealing boss is D2, wherein D1 is smaller than D2.

5. The integrable galvanic pile of claim 1, wherein: the height of the connecting sealing boss is H1, and the height of the second edge body is H2, and H1 = H2.

6. The integrable galvanic pile of claim 1, wherein: the second edge body comprises two second sub-edge bodies, an air inlet gap and an air outlet gap are formed between the two second sub-edge bodies, the second sub-edge bodies comprise wing sections, bent sections and flat sections which are sequentially connected, the wing sections are parallel to the direction of the cathode flow channel, the flat sections are perpendicular to the direction of the cathode flow channel, and the bent sections are connected with the wing ends and the flat sections.

7. The integrable galvanic pile of claim 2, wherein: the sealing frame comprises a sealing outer frame and a sealing inner frame, the sealing outer frame is arranged along the first edge body, one side of the cover plate is in sealing connection with the first edge body of one of the connecting bodies through the sealing outer frame, the sealing inner frame surrounds the flow passage through groove, and the battery piece is connected with the cover plate through the sealing inner frame.

8. The integrable galvanic pile of claim 1, wherein: one side of the cover plate is connected with the cathode side of one of the connectors in a matched manner through at least one part of the sealing frame, and a rigid welding sealing layer is formed between the other side of the cover plate and the first edge body of the other connector through welding.

9. The integrable galvanic pile of claim 8, wherein: the sealing frame comprises a sealing boss ring, a sealing outer frame, a sealing inner frame and a pressing strip, the first through hole and the second through hole are in sealing connection with the connecting sealing boss through the sealing boss ring, and one side of the cover plate is in matched connection with the cathode side of one of the connecting bodies through the sealing outer frame; the sealing inner frame is arranged around the edge of the battery piece and is connected with the sealing outer frame through the pressing strip.

10. The integrable galvanic pile of claim 9, wherein: the pressing strip extends along the gas flow direction perpendicular to the cathode flow channel, the second edge body is provided with a first groove and a second groove which are oppositely arranged, and two ends of the pressing strip are respectively connected with the first groove and the second groove; the sealing outer frame comprises a sealing frame and a sealing connecting strip, and two ends of the sealing connecting strip are respectively connected with the two separated sealing frames; the sealing frame is arranged along the second edge body, the sealing connecting strip is arranged along the pressing strip, and one side of the cover plate is connected with the pressing strip in a matched mode through the sealing connecting strip; the sealing inner frame is connected with the sealing connecting strip through the pressing strip.