CN117727967A - Connector of solid oxide fuel cell or electrolytic cell - Google Patents

Abstract

The invention relates to a connector of a solid oxide fuel cell or an electrolytic cell, which is provided with a body, wherein the body is provided with an anode face and a cathode face which are opposite, a plurality of inclined flow channels through which gas flows are uniformly engraved on the anode face and the cathode face, and the inclined flow channels on the anode face and the inclined flow channels on the cathode face form an intersection, so that anode gas on the anode face and cathode gas on the cathode face are in an intersecting flow, and uniform cell temperature distribution is realized. According to the solid oxide fuel cell or the connecting body of the electrolytic cell, the structure is simple, the flow channels are parallel to each other, the on-way resistance in the flow channels is the same, the S-shaped or snake-shaped flow channels with other complex structures are not provided, the cells and the cell stack can be effectively and thermally managed, the number of hot spots of the cells is reduced, the excessive temperature gradient in the cells is avoided, the thermal stress of the cells is reduced, the service life of the cell stack is prolonged, the risk that vortex and cavity are generated by gas at the bent angle is avoided, the current density of the cells is improved, and the performance of the cells is improved.

Description

Connector of solid oxide fuel cell or electrolytic cell

Technical Field

The present invention relates to fuel cells or electrolysers, and more particularly to a connector for solid oxide fuel cells or electrolysers.

Background

The solid oxide fuel cell (Solid Oxide Fuel Cell, SOEC) is a device capable of directly converting chemical energy in fuel and oxidant into electric energy at high temperature (500-1000 ℃), the solid oxide fuel cell (Solid Oxide Electrolysis Cell, SOEC) is a reverse reaction of SOFC, and can utilize electric energy to electrolyze fuel gas with small molecules, and has the advantages of high energy conversion rate, zero pollution, wide fuel adaptability, wide application field, high general long-term stability, no need of noble metal as a catalyst and the like, thereby being one of the fuel cells with the most application prospects for realizing high-efficiency environment-friendly power generation and hydrogen production and carbon reduction, and having important significance for sustainable development of society.

SOFCs/SOECs consist essentially of an anode, an electrolyte, a cathode, a connector and a seal. The connector has two main functions: firstly, single cells are connected to transmit electrons, so that output voltage, current and power are improved; and secondly, separating the fuel gas at the anode side from the oxidizing gas at the cathode side, and distributing the materials entering the two sides of the single cell. The working environment of the connector is harsh, and the connector is required to have high electrical conductivity, excellent thermal conductivity, oxidation resistance, fluidization resistance, carbon deposition resistance and other requirements, and good mechanical properties.

The condition of the SOFC system for long-term high-efficiency operation is that the heat balance of a cell stack is ensured, and an excessive thermal stress of a cell sheet can be caused by an excessive temperature gradient in the cell stack, and the deformation and cracking of the cell sheet can be caused by the excessive thermal stress, so that the long-term service life of the cell stack is influenced. In the actual working process, the change of the operation working condition necessarily needs the change of the output power along with the change, the flow rate, the temperature and the electrochemical reaction degree of the reactant also change drastically, and the heat released by the reaction also changes correspondingly, so that the fluctuation of the temperature of the electric pile is caused. The method commonly used for managing and controlling the heat balance of the electric pile is to exchange and dissipate heat and take away the heat through the flow of materials, and the gas flow can influence the temperature distribution inside the electric pile.

The upper side and the lower side of the connecting body are provided with special flow passage areas for distributing materials, and the rationality and the uniformity of the distribution of the materials on the surface of the cell influence the temperature distribution and the performance of the cell stack inside the cell stack. Therefore, the skillfully designed connector structure and reasonable air passage distribution can obtain smaller thermal stress, and can increase the uniformity of distribution of battery reactants and the gas concentration of a reaction interface, thereby improving the power of the battery and the fuel utilization rate.

CN112397743a discloses a solid oxide fuel cell connector, in which an internal flow channel parallel to the air side flow channel for cooling gas to pass through is provided inside the connector. However, the gas for cooling is additionally introduced into the connector, so that the energy consumption of the blower in the pile system is increased, and the overall efficiency of the system is reduced.

CN115000455a discloses a solid oxide fuel cell connector, the side wall of the connector ventilation slot and all long ribs enclose a serpentine flow channel, and by changing the number and arrangement of the long ribs and the short ribs in each flow channel partition on the serpentine flow channel, a gradual change type flow channel structure is formed in which the number of air flow channels gradually decreases according to the flow direction of air flow. The gradual change type flow passage structure with the air flow passage quantity gradually reduced according to the flow direction of the air flow is formed by changing the quantity and arrangement modes of the long ribs and the short ribs in each flow passage partition on the serpentine flow passage. However, the structure is complex, which is not beneficial to processing and manufacturing, and the flow field distribution of each cell in the cell stack is not uniform, and different numbers of long and short ribs are used for different layers in the cell stack, so that the processing and production difficulty of the cell is increased, and the method has poor prospect in commercial large-scale application. And, the resistance of the air current is increased to the snake-shaped runner, influences performance and life-span of battery.

CN116454309a discloses a connector for a solid oxide fuel cell, which has multiple sets of S-shaped parallel flow channels, and for a solid oxide fuel cell with internal reformed fuel, distributed utilization of reforming heat absorption can be realized by designing multiple sets of parallel short flow channels, so that concentration of heat absorption areas is reduced, and uniformity of internal temperature distribution of the cell is improved. The purpose of setting up multiunit S type parallel runner is for the reforming in methane provides reaction position, and the application of connector has the limitation, can only be used for the cell of reforming in methane, can't exert the extensive advantage of SOFC fuel suitability. In addition, the S-shaped flow channels can increase the on-way resistance of material flow, particularly the risk of carbon deposition of SOFC of methane fuel, and the possibility of carbon deposition at the corners of the S-shaped flow channels is higher, so that the performance, the service life and the safety of the cell are greatly affected.

In addition, the flow channels on the upper side and the lower side of the connecting body in the prior art are parallel straight flow channels, and fuel and air flow in the same direction or in opposite directions when flowing, so that the positions and the number of hot spots cannot be improved.

Disclosure of Invention

In order to solve the problems that the SOFC or SOEC using the direct current channel connector in the prior art may generate local thermal stress to cause cell failure during operation, the invention provides a connector of a solid oxide fuel cell or an electrolytic cell.

The connector of the solid oxide fuel cell or the electrolytic cell comprises a body, wherein the body is provided with an anode surface and a cathode surface which are opposite, a plurality of inclined flow channels through which gas flows are uniformly engraved on the anode surface and the cathode surface, and the inclined flow channels on the anode surface and the inclined flow channels on the cathode surface form an intersection, so that anode gas on the anode surface and cathode gas on the cathode surface are in an intersecting flow, and uniform cell temperature distribution is realized. It will be appreciated that the diagonal flow of the anode face does not actually intersect the diagonal flow of the cathode face, that is, the diagonal flow of the anode face and the diagonal flow of the cathode face have an intersection in a plane, but the intersection does not actually exist in three dimensions. The inclined flow passage of the cathode surface and the inclined flow passage of the cathode surface are not chiseled through, and are arranged in a crossing way at a certain angle on different planes, but not directly intersected.

Preferably, the inclined flow channel of the anode face has an inclination angle complementary to the inclination angle of the inclined flow channel of the cathode face.

Preferably, the anode face and the cathode face are respectively composed of symmetrical first and second parts, and the inclined angle of the inclined flow passage of the first part and the inclined angle of the inclined flow passage of the second part are axisymmetric.

Preferably, the anode gas flows up and left and up right along the diagonal flow on the anode face, the cathode gas flows down and left and right along the diagonal flow on the cathode face, and the flow directions of the anode gas and the cathode gas exhibit rhombic diagonal intersections.

Preferably, the body is provided with a through air inlet and outlet hole, the inner edge of the air inlet and outlet hole is respectively and concavely carved with a current collecting domain towards the battery, distribution air grooves are concavely carved along the periphery of the edge of the battery and the middle position of the connecting body, the current collecting domain is communicated with the distribution air grooves, and two ends of the inclined flow channel are communicated with the distribution air grooves.

Preferably, the body forms raised ribs by means of the engraved diagonal flow channels, the catchment areas and the distribution air channels.

Preferably, the anode surface and the cathode surface are distributed to comprise seven distribution air grooves, and two ends of the inclined flow passage are communicated with four distribution air grooves.

Preferably, the body has eight flow sections.

Preferably, the air inlet and outlet holes comprise an air inlet hole positioned at the middle part of one side and two air outlet holes positioned at two ends of the other side.

Preferably, a baffle is provided at the intersection of a portion of the distribution chute to prevent air flow from the inlet aperture directly along the distribution chute to the outlet aperture.

According to the solid oxide fuel cell or the connecting body of the electrolytic cell, the structure is simple, the flow channels are parallel to each other, the on-way resistance in the flow channels is the same, the S-shaped or snake-shaped flow channels with other complex structures are not provided, the cells and the cell stack can be effectively and thermally managed, the number of hot spots of the cells is reduced, the excessive temperature gradient in the cells is avoided, the thermal stress of the cells is reduced, the service life of the cell stack is prolonged, the risk that vortex and cavity are generated by gas at the bent angle is avoided, the current density of the cells is improved, and the performance of the cells is improved.

Drawings

Fig. 1 is a perspective view of a connector for a solid oxide fuel cell or electrolyser in accordance with a preferred embodiment of the invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a bottom view of fig. 1.

Fig. 4 is a perspective view of fig. 1.

Fig. 5 shows a temperature distribution of a junction of a conventional sprue.

Fig. 6 shows the temperature distribution of the junction body of the inclined flow passage of the present invention.

Fig. 7 shows a comparison of temperature differences between a conventional straight runner junction and an inclined runner junction of the present invention.

Fig. 8 shows the average current density comparison of a conventional straight runner connector and a diagonal runner connector of the present invention.

Detailed Description

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, the connection body of a solid oxide fuel cell or an electrolytic cell according to a preferred embodiment of the present invention has a body 1 in the shape of a rectangular plate, the body 1 having opposite rectangular top and bottom surfaces. The top surface is an anode surface, and anode gas flows from the battery. The bottom surface is a cathode surface, and cathode gas flows for power supply. At the place where the cell is placed, the anode side and the cathode side are uniformly notched with a plurality of inclined flow channels, i.e., a plurality of inclined flow channels 10 arranged in parallel. The anode and cathode surfaces are respectively composed of symmetrical first and second parts, and the inclined angle of the inclined flow channel 10 of the first part and the inclined angle of the inclined flow channel 10 of the second part are axisymmetric, so that the length of the cell flow channel is controlled in a shorter range, because the longer flow channel is unfavorable for the discharge of air flow. The inclined flow channels 10 are straight flow channels, and the lengths of the inclined flow channels are different, but the inclined angles are consistent or complementary, so that flow channels parallel to each other are formed. Thus, the air flow on the anode surface and the air flow on the cathode surface are in diamond-shaped cross flow, so that uniform battery temperature distribution is realized, and the effect of improving the battery performance is achieved. In the present embodiment, each inclined flow passage 10 has a rectangular cross section, and the inclination angle of each inclined flow passage 10 is 45 °. It should be understood that this angle of inclination is by way of example only and not limitation, and that it is possible to set it to 30-60, for example.

The following is for convenience of description, and the directions are up, down, left and right. Because the connector is horizontally placed when in use, the connector is not influenced by gravity up and down, and only is used for description up, down, left and right.

The body 1 is provided with a first anode air outlet hole 3, a second anode air outlet hole 4 and an anode air inlet hole 5 which penetrate through, wherein the first anode air outlet hole 3 is positioned at the left upper corner of the body 1, the second anode air outlet hole 4 is positioned at the right upper corner of the body 1, and the anode air inlet hole 5 is positioned at the middle part and the lower edge of the body 1.

The body 1 is provided with a first cathode air outlet hole 6, a second cathode air outlet hole 7 and a cathode air inlet hole 8 which penetrate through, wherein the first cathode air outlet hole 6 is positioned at the lower left corner of the body 1, the second cathode air outlet hole 7 is positioned at the lower right corner of the body 1, and the cathode air inlet hole 8 is positioned at the middle part and the upper edge of the body 1.

As shown in fig. 2, on the anode surface, current collecting areas 9, 21, 22 are respectively engraved on the inner edges of the anode inlet and outlet holes 3,4,5 toward the cell. Distribution gas grooves 11, 15, 16, 17, 18, 19, 20 are formed around the edge of the battery and in the middle of the connector in a negative way, so that seven distribution gas grooves are formed in the right, upper left, upper right, lower left, lower right and middle. The body 1 forms raised ribs 2 (see fig. 1) through the notched diagonal flow 10, the current collecting areas 9, 21, 22 and the distribution gas grooves 11, 15, 16, 17, 18, 19, 20, and the ribs 2 play a role of uniformly separating and disposing gas and collecting current generated by the battery. The two ends of the inclined flow channel 10 are communicated with four distribution air grooves 11, 15, 16, 17, 18, 19 and 20. A baffle plate 12 is arranged at the intersection of the distribution air grooves 11, 19, a baffle plate 13 which enables the air grooves to be semi-closed is arranged at the intersection of the distribution air grooves 15, 16, 20, and a baffle plate 14 is arranged at the intersection of the distribution air grooves 17, 18. Except for the positions where the baffle plates 12, 13, 14 are arranged, the intersections of the other distribution grooves 11, 15, 16, 17, 18, 19, 20 are communicated.

The anode gas flows in through the anode inlet holes 5, flows into the first collecting basin 22 to collect and fully fuse the gas, flows leftwards, rightwards and upwards through the distribution gas tanks 18, 19, 20, and gradually enters the inclined flow channels 10 along the way due to the gas pressure in the flowing process.

The gas entering the first distribution gas tank 18 flows in the upper left direction through the left inclined flow channel 10, flows to the tail end of the flow channel and enters the second distribution gas tank 17; the gas entering the third distribution gas tank 19 flows in the upper right direction through the inclined flow channel 10 on the right side, flows to the tail end of the flow channel and enters the fourth distribution gas tank 11; the gas entering the fifth distribution chute 20 may flow in the upper left direction into the left diagonal flow 10 to the sixth distribution chute 15, or may flow in the upper right direction into the right diagonal flow 10 to the seventh distribution chute 16; the gas in the second distribution gas tank 17 and the sixth distribution gas tank 15 is converged into the second collecting area 21, and finally is discharged from the connecting body through the first anode gas outlet hole 3; the gas in the fourth and seventh distribution gas tanks 11 and 16 is collected into the third collecting basin 9, and finally discharged from the second anode gas outlet holes 4.

Due to the arrangement of the first baffle plate 14, the gas in the first distribution gas tank 18 cannot directly enter the second distribution gas tank 17; due to the arrangement of the second baffle plate 12, the gas in the third distribution gas tank 19 cannot directly enter the fourth distribution gas tank 11; due to the provision of the third baffle 13, the gas in the fifth gas distribution groove 20 cannot directly enter the sixth gas distribution groove 15 and the seventh gas distribution groove 16. The design scheme can avoid gas short circuit, even if the gas can directly flow from the inlet to the outlet along the path with the minimum resistance along the distribution gas groove, the dense inclined flow channel with larger resistance is not needed, the flow channel must be narrow and dense in consideration of the collecting current effect of the ribs, and therefore, a flow baffle plate is needed to be arranged to force the gas to enter the inclined flow channel to contact the active surface of the battery for electrochemical reaction.

As shown in fig. 3, on the cathode surface, current collecting areas 33, 34, 35 are respectively engraved on the inner edges of the cathode inlet and outlet holes 6,7,8 toward the cell. The distribution grooves 23, 24, 25, 26, 27, 28, 29 are engraved along the periphery of the edge of the battery and at the middle position of the connector, so that seven distribution grooves are formed. The body 1, through the engraved diagonal flow 10, the collecting chambers 33, 34, 35 and the distribution channels 23, 24, 25, 26, 27, 28, 29, forms raised ribs 2 (see fig. 1), which ribs 2 serve to collect the current generated by the cells while uniformly separating the gases. The two ends of the inclined flow channel 10 are communicated with four distribution air grooves 23, 24, 25, 26, 27, 28 and 29. A baffle 30 is provided at the intersection of the distribution air channels 23, 29, a baffle 31 is provided at the intersection of the distribution air channels 24, 25, and a baffle 32 is provided at the intersection of the distribution air channels 26, 27, 28 to semi-close the air channels. Except for the locations where the flow baffles 30, 31, 32 are provided, the intersections of the distribution grooves 23, 24, 25, 26, 27, 28, 29 are all in communication.

When the connector is used, the gas flows in the same way on the cathode face and the anode face, but in opposite directions.

The cathode gas flows in through the anode inlet hole 8, flows into the fourth collecting basin 34 to collect and fully fuse the gas, flows leftwards, rightwards and downwards through the distribution gas grooves 23, 24, 27, and gradually enters the inclined flow channel 10 along the way due to the gas pressure in the flowing process.

The gas entering the eighth distributing gas tank 24 flows in the lower left direction through the left inclined flow channel 10, flows to the end of the flow channel and enters the ninth distributing gas tank 25; the gas entering the tenth gas distribution groove 23 flows in the right lower direction through the right inclined flow channel 10, flows to the end of the flow channel and enters the eleventh gas distribution groove 29; the gas entering the tenth distribution duct 27 may flow in the left lower direction into the left diagonal duct 10 to the thirteenth distribution duct 26, or may flow in the right lower direction into the right diagonal duct 10 to the fourteenth distribution duct 28; the gas in the ninth distribution gas tank 25 and the thirteenth distribution gas tank 26 is led into the fifth collecting area 35, and finally is discharged from the connecting body through the first cathode gas outlet hole 7; the gas in the eleventh 29 and fourteenth 28 gas distribution channels is led into the sixth collecting chamber 33 and finally out of the connection via the second cathode outlet 6.

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 gas distribution groove 23 from directly entering the eleventh gas distribution groove 29; the sixth baffle 32 prevents the gas in the twelfth distribution gas tank 27 from directly entering the thirteenth and fourteenth distribution gas tanks 26 and 28.

As shown in fig. 4, when the connector is in use, anode gas flows on the anode surface along the inclined flow channel 10 to the left and the right, cathode gas flows on the cathode surface along the inclined flow channel 10 to the left and the right, the flowing directions of the anode gas and the cathode gas show rhombic inclined intersection, and the crossed flowing mode can strengthen the heat exchange of the gases at two sides, reduce the thermal stress and prolong the service life of the battery. In addition, in the flowing process of the gas, due to the arrangement of the inclined flow channel 10 and the distribution gas grooves 11, 15, 16, 17, 18, 19, 20, 23, 24, 25, 26, 27, 28 and 29, eight flowing sections are spontaneously formed by the gas flow, so that the displacement of the gas flowing is shortened, the probability of no gas at the tail end of the flow channel is reduced, the material distribution of the battery is more uniform, and the performance of the battery is improved.

By utilizing a multi-physical field numerical simulation method, the thermoelectric performance of the connector of the inclined flow channel 10 and the thermoelectric performance of the connector of the conventional straight flow channel are compared under the same condition. The results were as follows:

fig. 5 shows the temperature distribution of the fuel electrode of the cell when the cathode gas 1073K (80% water vapor and 20% hydrogen) and the anode gas (air) are introduced in the SOEC mode, and the two gases flow in a countercurrent manner, using the conventional straight flow channel connector, with three inlet and outlet holes of the cathode and anode, respectively. The temperature is higher at the inlet and as the electrochemical reaction of hydrogen production by electrolysis of water proceeds, the endothermic reaction causes the temperature of the cell to gradually decrease with the flow direction of the water vapor. The hot spot of temperature was concentrated at the inlet of the fuel gas, the highest temperature was 1071.5K, the lowest point of temperature was concentrated at the upper left and upper right corners, and the lowest temperature was 916.93K. The temperature difference of the fuel electrode was 154.57K and the maximum temperature gradient was 26618K/m.

Fig. 6 shows the temperature distribution of the fuel electrode of the cell when 1073K cathode gas (80% water vapor and 20% hydrogen) and anode gas (air) were introduced in SOEC mode using the connection body of the inclined flow channel of the present invention. Because the cathode and anode gases flow in a diamond-shaped crossing mode, the temperature distribution of the battery is not obviously distinguished by inlet and outlet, hot spots of the temperature are concentrated at the left side edge and the right side edge and are symmetrically distributed, the highest temperature is 1071.9K, the lowest temperature point is concentrated at the middle part of the battery, and the lowest temperature is 1070K. The temperature difference of the fuel electrode was 1.9K and the maximum temperature gradient was 1841.8K/m.

As shown in fig. 7, the maximum temperature difference was reduced by 98% and the maximum temperature gradient was reduced by 93% as compared with the case of using the connection body of the direct current channel, the temperature distribution of the connection body battery using the diagonal current channel was significantly more uniform, the corresponding thermal stress was greatly reduced, and the stability and the service life of the battery could be improved.

The use of a diagonal flow can also improve cell performance. As shown in FIG. 8, when a DC channel is used, the average current density of the battery is 597.61A/m ² When using a diagonal flow, the average current density of the battery was 686.69A/m ² The battery performance is improved by 13%.

The invention adopts the inclined flow channel, solves the problems that the existing connectors are all parallel straight flow channels, only can adopt a forward flow or reverse flow mode, the fuel concentration speed gradually decreases along with the flow in the flow channel, the temperature gradient at the tail part is larger, and local thermal stress is generated to cause the failure of the battery. The cross flow of the invention can reduce the hot spot of the battery, realize more uniform temperature distribution of the battery and improve the performance of the battery. If the cross flow of the electric pile is realized through the straight flow channel, the cross flow can only be realized by rotating each layer of the connecting body by 90 degrees when the electric pile is assembled, but the cross flow can only be realized vertically, and the cross flow can only be realized on a square battery, so that the application range is narrow, the problem that the rectangular battery cannot be packaged can occur, and therefore, the rectangular battery can only adopt a forward flow and a reverse flow mode. The invention can realize the application mode of cross flow by a single connector, has no requirement on the shape of the battery, can be used in square batteries and also can be used in any rectangular batteries, and can popularize the application range of the cross flow. In addition, due to the diamond-shaped crossed structure, not only can the vertical crossing be realized, but also the crossed structure with any angle can be expanded.

Compared with the existing connector, the result obtained through preliminary verification of numerical simulation calculation can prove that the inclined connector has excellent effect on uniform temperature distribution. Meanwhile, the performance of the battery can be improved, and the cooperative reinforcement of the thermoelectric performance of the battery is realized.

Compared with the existing connector improved for improving the temperature distribution of the battery, the connector is simple in structure, the flow channels are mutually parallel inclined flow channels, S-shaped and S-shaped flow channels are avoided, and therefore the risk of vortex and cavity generation of gas at bent angles is avoided. And no secondary air flow is adopted, so that the air quantity used for thermal management can be saved, and the efficiency of the whole battery system is improved.

The invention realizes the synergistic enhancement of the thermoelectric performance of the battery. The cathode gas and the anode gas flow in the rhombic and obliquely crossed mode, the temperature of the air and the temperature of the fuel gas can be interweaved and complemented, the air can keep the temperature difference with the fuel gas at multiple points, the convection heat transfer effect is enhanced, the temperature change caused by the electrochemical reaction can be taken away by the air more timely and in a larger quantity, and therefore, the traditional battery has no gradual rise (SOEC) or decline (SOEC) of the flowing temperature of the fuel gas along with the battery, and the temperature distribution of the battery is uniform. When the temperature distribution of the battery is more uniform, the electrochemical reaction area of high efficiency is larger, and thus the performance of the battery can be improved to some extent.

The invention expands the application range and the cross angle range of the cross manifold. The inclined flow passage connector can adjust the inclination angle, and can divide the rectangle into different flow areas, so that the inclined flow passage connector can be applied to square batteries and can be further expanded to batteries with any rectangle.

The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and various modifications can be made to the above-described embodiment of the present invention. All simple, equivalent changes and modifications made in accordance with the claims and the specification of this application fall within the scope of the patent claims. The present invention is not described in detail in the conventional art.

Claims (10)

1. A connector for a solid oxide fuel cell or an electrolytic cell, the connector comprising a body having an anode face and a cathode face opposite to each other, wherein a plurality of diagonal flow channels through which a gas flows are uniformly notched on the anode face and the cathode face, and the diagonal flow channels on the anode face intersect with the diagonal flow channels on the cathode face, so that the anode gas on the anode face and the cathode gas on the cathode face cross each other, thereby realizing uniform cell temperature distribution.

2. The connector of claim 1, wherein the oblique flow channels of the anode face have an oblique angle complementary to the oblique flow channels of the cathode face.

3. The connector of claim 1, wherein the anode face and the cathode face are formed of symmetrical first and second portions, respectively, and wherein the oblique flow path of the first portion and the oblique flow path of the second portion are axially symmetrical.

4. A connection according to claim 3, wherein the anode gas flows up and left and up right along the diagonal flow at the anode face, the cathode gas flows down and left and right along the diagonal flow at the cathode face, and the directions of flow of the anode gas and the cathode gas exhibit rhombic diagonal intersections.

5. The connector of claim 1, wherein the body has a through air inlet and outlet hole, the inner edge of the air inlet and outlet hole is respectively notched with a current collecting region toward the battery, the current collecting region is notched with a distributing air groove along the periphery of the battery edge and the middle position of the connector, the current collecting region is communicated with the distributing air groove, and two ends of the inclined flow channel are communicated with the distributing air groove.

6. The connector of claim 5, wherein the body forms raised ribs through the notched diagonal flow channels, the catchment areas, and the distribution air slots.

7. The connector of claim 5, wherein the anode face and the cathode face are distributed to include seven distribution air grooves, and two ends of the diagonal flow passage are communicated with four distribution air grooves.

8. The connector of claim 7, wherein the body has eight flow sections.

9. The connector of claim 5, wherein the air inlet and outlet holes comprise an air inlet hole in the middle of one side and two air outlet holes at both ends of the other side.

10. A connector as claimed in claim 9, wherein a baffle is provided at the intersection of part of the gas distribution slots to prevent gas flow from the inlet aperture directly along the gas distribution slots to the outlet aperture.