Fuel cell multi-stack integration device

Abstract

The utility model relates to a fuel cell multi-stack integrated device, which comprises a stack assembly, a plurality of fuel cells, a plurality of fuel cells and a plurality of fuel cells, the air inlet valve plate is provided with an air inlet flow channel, a hydrogen inlet flow channel and a heat-conducting medium flow channel which are arranged at intervals; the air inlet flow channel comprises an air confluence inlet, an air inlet main flow channel and a plurality of air inlet branch flow channels which are communicated in sequence, and the air flow in the air inlet branch flow channels can be adjusted; the hydrogen inlet flow channel comprises a hydrogen confluence inlet, a hydrogen inlet main flow channel and a plurality of hydrogen inlet branch flow channels which are communicated in sequence, and the hydrogen flow in the hydrogen inlet branch flow channels is adjustable; the heat-conducting medium flow channel comprises a heat-conducting medium confluence inlet, a heat-conducting medium liquid inlet main flow channel and a plurality of heat-conducting medium liquid inlet branch flow channels which are communicated in sequence. Therefore, the fuel cell multi-stack integration device disclosed by the utility model has the advantages of being high in integration, convenient to disassemble and assemble and convenient to adjust the air inflow.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, concretely relates to a fuel cell multi -stack integrated device. BACKGROUND

[0002] Fuel cell power generation system is used in more and more scenes due to the advantages of clean and high efficiency, and the technology is also more and more mature, and the power generation efficiency and volume power density are improved. High-temperature fuel cell is limited by the uniformity of internal heat transfer and mass transfer distribution, and the power level of a single stack is generally not more than 10kW, which is difficult to meet the requirements of high-power application. In order to realize high-power output, multiple stacks need to be integrated. The existing fuel cell stack is connected through external pipeline during integration, which has low integration degree, complex structure and is troublesome to disassemble and maintain, and is not conducive to large-scale popularization and application. And high-temperature fuel cell has its own problems in multi-stack integration due to its high-temperature operating characteristics. First, the stack expands in the high-temperature environment, and the impact of this part needs to be considered additionally. Second, when the number of parallel stacks increases, the stack gas distribution is complex, and uneven gas flow of each stack will affect the working state of the stack, and in severe cases, it will affect the service life of the stack. At the same time, the low gas inlet pressure of high-temperature fuel cell increases the complexity of gas control. Third, the influence of high-temperature environment on end plate structure, moving parts and sensors needs to be considered. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art is solved to some extent. To this end, the embodiment of the utility model provides a fuel cell multi-stack integrated device.

[0004] The fuel cell multi-stack integrated device provided by the embodiment of the utility model comprises:

[0005] The stack assembly comprises a plurality of cell stacks, and each of the plurality of cell stacks is provided with an air inlet, a hydrogen inlet and a heat-conducting medium inlet at a first end portion in a first direction.

[0006] The gas inlet valve plate has a thickness direction being the first direction, and the gas inlet valve plate is adjacent to the first end portion of the cell stack in the first direction. The gas inlet valve plate has an air inlet flow channel, a hydrogen inlet flow channel and a heat-conducting medium flow channel arranged at intervals.

[0007] The air inlet flow channel comprises an air converging inlet, an air inlet main flow channel and a plurality of air inlet branch flow channels connected in sequence. The plurality of air inlet branch flow channels are in one-to-one correspondence with the air inlets of the plurality of cell stacks. The air flow in the air inlet branch flow channel is adjustable.

[0008] The hydrogen gas inlet flow channel comprises a hydrogen gas converging inlet, a hydrogen gas inlet main flow channel and a plurality of hydrogen gas inlet branch flow channels connected in sequence, the plurality of hydrogen gas inlet branch flow channels are in one-to-one correspondence with the hydrogen gas inlets of the plurality of battery stacks, and the hydrogen gas flow in the hydrogen gas inlet branch flow channel is adjustable.

[0009] The heat-conducting medium flow channel comprises a heat-conducting medium converging inlet, a heat-conducting medium inlet main flow channel and a plurality of heat-conducting medium inlet branch flow channels connected in sequence, and the plurality of heat-conducting medium inlet branch flow channels are in one-to-one correspondence with the heat-conducting medium inlets of the plurality of battery stacks.

[0010] Therefore, the fuel cell multi-stack integrated device has the advantages of high integration, easy disassembly and adjustment of the air inlet amount.

[0011] In some embodiments, the plurality of battery stacks of the stack assembly are arranged side by side in a second direction;

[0012] The length direction of the air inlet main flow channel is a second direction, the width direction of the air inlet main flow channel is a third direction, the plurality of air inlet branch flow channels are arranged at intervals in the second direction, and any two of the first direction, the second direction and the third direction are perpendicular to each other;

[0013] The length direction of the hydrogen gas inlet main flow channel is a second direction, and the width direction of the hydrogen gas inlet main flow channel is a third direction, and the plurality of hydrogen gas inlet branch flow channels are arranged at intervals in the second direction;

[0014] Each of the air inlet branch flow channels and each of the hydrogen gas inlet branch flow channels has a flow regulating member matched therewith.

[0015] In some embodiments, the air inlet main flow channel is a rectangular groove, and the width of the air inlet main flow channel is greater than or equal to 40 mm;

[0016] The air inlet branch flow channel is in communication with the air inlet main flow channel and the air inlet at both ends in the third direction;

[0017] The flow regulating member in the air inlet branch flow channel is located at the middle position of the air inlet branch flow channel in the third direction;

[0018] The hydrogen gas inlet main flow channel is a rectangular groove, and the width of the hydrogen gas inlet main flow channel is greater than or equal to 40 mm;

[0019] The hydrogen gas inlet branch flow channel is in communication with the hydrogen gas inlet main flow channel and the hydrogen gas inlet at both ends in the third direction;

[0020] The flow regulating member in the hydrogen gas intake branch flow channel is located at a middle position of the hydrogen gas intake branch flow channel in the third direction.

[0021] In some embodiments, the cross-sectional outer periphery profile of the air intake branch flow channel and the hydrogen gas intake branch flow channel is circular, the flow regulating member in the air intake branch flow channel and the hydrogen gas intake branch flow channel is a butterfly valve, the butterfly valve driver of the butterfly valve is arranged on the intake valve plate, and the butterfly valve disc of the butterfly valve is located in the corresponding air intake branch flow channel or hydrogen gas intake branch flow channel.

[0022] In some embodiments, the cross-sectional outer periphery profile of the air intake branch flow channel and the hydrogen gas intake branch flow channel is rectangular, the flow regulating member in the air intake branch flow channel and the hydrogen gas intake branch flow channel is a diaphragm valve, the diaphragm valve driver of the diaphragm valve is arranged on the intake valve plate, and the diaphragm membrane of the diaphragm valve is located in the corresponding air intake branch flow channel or hydrogen gas intake branch flow channel.

[0023] In some embodiments, the intake valve plate comprises an intake cover plate and an intake base plate, and the thickness direction of the intake cover plate and the intake base plate is the first direction.

[0024] The air confluence inlet, the hydrogen gas confluence inlet, and the heat conducting medium confluence inlet are arranged on the intake cover plate.

[0025] The intake cover plate and the intake base plate are connected to define the air intake main flow channel, the air intake branch flow channel, the hydrogen gas intake main flow channel, the hydrogen gas intake branch flow channel, the heat conducting medium liquid inlet main flow channel, and the heat conducting medium liquid inlet branch flow channel.

[0026] In some embodiments, a sealing member is arranged between the intake cover plate and the intake base plate, and the sealing member is used to seal the air intake main flow channel, the air intake branch flow channel, the hydrogen gas intake main flow channel, the hydrogen gas intake branch flow channel, the heat conducting medium liquid inlet main flow channel, and the heat conducting medium liquid inlet branch flow channel.

[0027] In some embodiments, the outer side of the air intake main flow channel, the air intake branch flow channel, the hydrogen gas intake main flow channel, the hydrogen gas intake branch flow channel, the heat conducting medium liquid inlet main flow channel, and the heat conducting medium liquid inlet branch flow channel is provided with a sealing groove, and the sealing member is arranged in the sealing groove.

[0028] In some embodiments, each of the plurality of battery stacks is provided with an air outlet, a hydrogen gas outlet, and a heat conducting medium outlet at the second end in the first direction.

[0029] The exhaust valve plate is provided at one end of the stack assembly in the first direction away from the air inlet valve plate, a thickness direction of the exhaust valve plate is the first direction, the exhaust valve plate is adjacent to the second end of the battery stack in the first direction, and the exhaust valve plate has air outlet flow channels, hydrogen outlet flow channels, and heat-conducting medium flow channels arranged at intervals;

[0030] The air outlet flow channels include air collecting outlets, air outlet main flow channels, and a plurality of air outlet branch flow channels connected in sequence, and the plurality of air outlet branch flow channels are in one-to-one correspondence with the air outlets of the plurality of battery stacks;

[0031] The hydrogen outlet flow channels include hydrogen collecting outlets, hydrogen outlet main flow channels, and a plurality of hydrogen outlet branch flow channels connected in sequence, and the plurality of hydrogen outlet branch flow channels are in one-to-one correspondence with the hydrogen outlets of the plurality of battery stacks;

[0032] The heat-conducting medium flow channels include heat-conducting medium collecting outlets, heat-conducting medium outlet liquid main flow channels, and a plurality of heat-conducting medium outlet liquid branch flow channels connected in sequence, and the plurality of heat-conducting medium outlet liquid branch flow channels are in one-to-one correspondence with the heat-conducting medium outlets of the plurality of battery stacks.

[0033] In some embodiments, the exhaust valve plate includes an exhaust base plate and an exhaust cover plate, and the thickness directions of the exhaust cover plate and the exhaust base plate are both the first direction;

[0034] The air collecting outlets, the hydrogen collecting outlets, and the heat-conducting medium collecting outlets are formed in the exhaust cover plate;

[0035] The exhaust cover plate and the exhaust base plate are connected to define the air outlet main flow channels, the air outlet branch flow channels, the hydrogen outlet main flow channels, the hydrogen outlet branch flow channels, the heat-conducting medium outlet liquid main flow channels, and the heat-conducting medium outlet liquid branch flow channels;

[0036] The stack assembly includes six battery stacks;

[0037] The inlet of the battery stack, the outlet of the battery stack, the outlet of the air inlet valve plate, and the inlet of the exhaust valve plate are all provided with threads;

[0038] The outlet of the air inlet valve plate and the inlet of the battery stack are communicated through a threaded sleeve and a connecting pipe;

[0039] The outlet of the battery stack and the inlet of the exhaust valve plate are communicated through a threaded sleeve and a connecting pipe. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1is a schematic view of a fuel cell multi-stack integrated device according to an embodiment of the present application.

[0041] Figure 2 is a schematic view of a gas inlet base plate according to an embodiment of the present application.

[0042] Figure 3 is a schematic view of a branch flow channel provided with a butterfly valve according to an embodiment of the present application.

[0043] Figure 4 is a schematic view of a branch flow channel provided with a diaphragm valve according to an embodiment of the present application.

[0044] Reference signs:

[0045] 1, gas inlet valve plate, 11, gas cover plate, 111, butterfly valve driver, 112, heat transfer medium confluence inlet, 113, air confluence inlet, 114, hydrogen confluence inlet, 115, butterfly valve disc, 116, diaphragm valve driver, 117, diaphragm valve diaphragm, 12, gas inlet base plate, 121, sealing groove, 122, hydrogen gas inlet main flow channel, 123, hydrogen gas inlet branch flow channel, 124, air inlet main flow channel, 125, air inlet branch flow channel, 126, heat transfer medium liquid inlet main flow channel, 127, heat transfer medium liquid inlet branch flow channel;

[0046] 2, stack assembly, 21, cell stack, 22, connecting pipe;

[0047] 3, exhaust valve plate, 31, exhaust base plate, 32, exhaust cover plate. DETAILED DESCRIPTION

[0048] The embodiments of the present application are described in detail below, examples of which are shown in the drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0049] A fuel cell multi-stack integrated device according to an embodiment of the present application is described below with reference to the drawings. As shown in Figures 1 to 4 , the fuel cell multi-stack integrated device according to an embodiment of the present application comprises a gas inlet valve plate 1 and a stack assembly 2.

[0050] The stack assembly 2 comprises a plurality of cell stacks 21, and each of the plurality of cell stacks 21 is provided with an air inlet, a hydrogen inlet and a heat transfer medium inlet at a first end portion in a first direction. Specifically, the plurality of cell stacks 21 of the stack assembly 2 are arranged side by side in a second direction. The stack assembly 2 comprises six cell stacks 21. The first direction can be a left-right direction, and the second direction can be an up-down direction. For example, the left end portion of the cell stack 21 is provided with an air inlet, a hydrogen inlet and a heat transfer medium inlet, and the six cell stacks 21 of the stack assembly 2 are arranged side by side in the up-down direction.

[0051] As shown in Figures 1 to 4 the thickness direction of the air inlet valve plate 1 is the first direction, the air inlet valve plate 1 is adjacent to the first end of the battery stack 21 in the first direction, and the air inlet valve plate 1 has air inlet flow channels, hydrogen inlet flow channels, and heat-conducting medium flow channels arranged at intervals. For example, the thickness direction of the air inlet valve plate 1 is the left-right direction, and the air inlet valve plate 1 is adjacent to the left end of the battery stack 21.

[0052] The air inlet flow channel includes an air inlet manifold inlet 113, an air inlet main flow channel 124, and a plurality of air inlet branch flow channels 125 connected in sequence. The plurality of air inlet branch flow channels 125 are in one-to-one correspondence with the air inlets of the plurality of battery stacks 21. In this way, air can pass into the air inlets of the plurality of battery stacks 21 in sequence through the air inlet manifold inlet 113, the air inlet main flow channel 124, and the plurality of air inlet branch flow channels 125, thereby providing air for the plurality of battery stacks 21.

[0053] The hydrogen inlet flow channel includes a hydrogen inlet manifold inlet 114, a hydrogen inlet main flow channel 122, and a plurality of hydrogen inlet branch flow channels 123 connected in sequence. The plurality of hydrogen inlet branch flow channels 123 are in one-to-one correspondence with the hydrogen inlets of the plurality of battery stacks 21. In this way, hydrogen can pass into the hydrogen inlets of the plurality of battery stacks 21 in sequence through the hydrogen inlet manifold inlet 114, the hydrogen inlet main flow channel 122, and the plurality of hydrogen inlet branch flow channels 123, thereby providing hydrogen for the plurality of battery stacks 21.

[0054] The air flow in the air inlet branch flow channel 125 can be adjusted, so that the amount of air passing into each battery stack 21 can be adjusted. The hydrogen flow in the hydrogen inlet branch flow channel 123 can be adjusted, so that the amount of hydrogen passing into each battery stack 21 can be adjusted. The amount of air and the amount of hydrogen passing into each battery stack 21 can be adjusted to adjust the output voltage of each battery stack 21.

[0055] The heat-conducting medium flow channel includes a heat-conducting medium manifold inlet 112, a heat-conducting medium inlet main flow channel 126, and a plurality of heat-conducting medium inlet branch flow channels 127 connected in sequence, and the plurality of heat-conducting medium inlet branch flow channels 127 are in one-to-one correspondence with the heat-conducting medium inlets of the plurality of battery stacks 21. In this way, heat-conducting medium can pass into the heat-conducting medium inlets of the plurality of battery stacks 21 in sequence through the heat-conducting medium manifold inlet 112, the heat-conducting medium inlet main flow channel 126, and the plurality of heat-conducting medium inlet branch flow channels 127, thereby providing heat-conducting medium inlets for the plurality of battery stacks 21. For example, the heat-conducting medium is heat-conducting oil.

[0056] As shown in Figure 2As shown, in some embodiments, the length direction of the air intake main flow channel 124 is the second direction, the width direction of the air intake main flow channel 124 is the third direction, and the plurality of air intake branch flow channels 125 are arranged at intervals in the second direction. Any two of the first direction, the second direction, and the third direction are perpendicular to each other. Specifically, the air intake main flow channel 124 is a rectangular groove, and the width of the air intake main flow channel 124 is greater than or equal to 40 mm. The air intake branch flow channels 125 are respectively communicated with the air intake main flow channel 124 and the air inlet at both ends in the third direction.

[0057] The third direction can be the front-rear direction. For example, the length direction of the air intake main flow channel 124 is the up-down direction, the width direction of the air intake main flow channel 124 is the front-rear direction, and the width of the air intake main flow channel 124 is 40 mm. The plurality of air intake branch flow channels 125 are arranged at intervals in the up-down direction, and the air intake branch flow channels 125 are respectively communicated with the air intake main flow channel 124 and the air inlet of the battery stack 21 at both ends in the front-rear direction.

[0058] The length direction of the hydrogen intake main flow channel 122 is the second direction, and the width direction of the hydrogen intake main flow channel 122 is the third direction. The plurality of hydrogen intake branch flow channels 123 are arranged at intervals in the second direction. Specifically, the hydrogen intake main flow channel 122 is a rectangular groove, and the width of the hydrogen intake main flow channel 122 is greater than or equal to 40 mm. The hydrogen intake branch flow channels 123 are respectively communicated with the hydrogen intake main flow channel 122 and the hydrogen inlet at both ends in the third direction. For example, the length direction of the hydrogen intake main flow channel 122 is the up-down direction, the width direction of the hydrogen intake main flow channel 122 is the front-rear direction, and the width of the hydrogen intake main flow channel 122 is 40 mm. The plurality of hydrogen intake branch flow channels 123 are arranged at intervals in the up-down direction, and the hydrogen intake branch flow channels 123 are respectively communicated with the hydrogen intake main flow channel 122 and the hydrogen inlet of the battery stack 21 at both ends in the front-rear direction.

[0059] Each air intake branch flow channel 125 and each hydrogen intake branch flow channel 123 has a flow regulating member matched therewith. Specifically, the flow regulating member in the air intake branch flow channel 125 is located at the middle position of the air intake branch flow channel 125 in the third direction. The flow regulating member in the hydrogen intake branch flow channel 123 is located at the middle position of the hydrogen intake branch flow channel 123 in the third direction. For example, the flow regulating member is a butterfly valve or a diaphragm valve.

[0060] As shown, in some embodiments, the length direction of the air intake main flow channel 124 is the second direction, the width direction of the air intake main flow channel 124 is the third direction, and the plurality of air intake branch flow channels 125 are arranged at intervals in the second direction. Any two of the first direction, the second direction, and the third direction are perpendicular to each other. Specifically, the air intake main flow channel 124 is a rectangular groove, and the width of the air intake main flow channel 124 is greater than or equal to 40 mm. The air intake branch flow channels 125 are respectively communicated with the air intake main flow channel 124 and the air inlet at both ends in the third direction. Figures 1 to 4As shown, in some embodiments, the air inlet valve plate 1 comprises an air inlet cover plate 11 and an air inlet base plate 12, and the thickness direction of the air inlet cover plate 11 and the air inlet base plate 12 is the first direction. The air converging inlet 113, the hydrogen converging inlet 114 and the heat conducting medium converging inlet 112 are arranged on the air inlet cover plate 11. The air inlet cover plate 11 and the air inlet base plate 12 are connected to define an air inlet main flow channel 124, an air inlet branch flow channel 125, a hydrogen inlet main flow channel 122, a hydrogen inlet branch flow channel 123, a heat conducting medium inlet main flow channel 126 and a heat conducting medium inlet branch flow channel 127. For example, half of each of the air inlet main flow channel 124, the air inlet branch flow channel 125, the hydrogen inlet main flow channel 122, the hydrogen inlet branch flow channel 123, the heat conducting medium inlet main flow channel 126 and the heat conducting medium inlet branch flow channel 127 is arranged on the air inlet cover plate 11, and the other half is arranged on the air inlet base plate 12. The outlets of the air inlet branch flow channel 125, the hydrogen inlet branch flow channel 123 and the heat conducting medium inlet branch flow channel 127 pass through the air inlet base plate 12.

[0061] In some embodiments, a sealing member is arranged between the air inlet cover plate 11 and the air inlet base plate 12, and the sealing member is used to seal the air inlet main flow channel 124, the air inlet branch flow channel 125, the hydrogen inlet main flow channel 122, the hydrogen inlet branch flow channel 123, the heat conducting medium inlet main flow channel 126 and the heat conducting medium inlet branch flow channel 127. Specifically, the outer side of each of the air inlet main flow channel 124, the air inlet branch flow channel 125, the hydrogen inlet main flow channel 122, the hydrogen inlet branch flow channel 123, the heat conducting medium inlet main flow channel 126 and the heat conducting medium inlet branch flow channel 127 is provided with a sealing groove 121, and the sealing member is arranged in the sealing groove 121. For example, a fluororubber sealing ring is selected to seal the hydrogen inlet main flow channel 122, the hydrogen inlet branch flow channel 123, the heat conducting medium inlet main flow channel 126 and the heat conducting medium inlet branch flow channel 127. For the air inlet main flow channel 124 and the air inlet branch flow channel 125, a flexible polytetrafluoroethylene gasket is selected for sealing.

[0062] As shown, Figure 3As shown, in some embodiments, the outer periphery of the cross-section of the air intake branch channel 125 and the hydrogen intake branch channel 123 are both circular, and the flow regulating element in the air intake branch channel 125 and the hydrogen intake branch channel 123 is a butterfly valve. The butterfly valve actuator 111 is provided on the intake valve plate 1, and the butterfly valve disc 115 is located in the corresponding air intake branch channel 125 or hydrogen intake branch channel 123. Specifically, after the intake cover plate 11 and the intake base plate 12 are fastened together, a circular flow channel is formed, and the inner diameter of the formed flow channel is 20 mm. The butterfly valve actuator 111 is installed on the intake cover plate 11, and the bottom of the butterfly valve actuator 111 is connected to the butterfly valve disc 115. The disc diameter is 19 cm, and when rotated, the flow rate of the air intake branch channel 125 and the hydrogen intake branch channel 123 can be regulated. During system operation, the intake pressure of air and hydrogen can be measured by pressure sensors integrated within the butterfly valve actuator 111. Simultaneously, the peripheral system continuously measures the output voltage of each fuel cell stack. The controller has a pre-calibrated operating voltage range for the fuel cell stack 21 under different load currents. When the voltage of a fuel cell stack 21 is detected to be lower than the lower limit of the operating range, the butterfly valve disc 115 will be driven to flip, increasing the intake passage and improving the intake conditions of hydrogen and air into the fuel cell stack. This enhances the consistency of the fuel cell stack's operating characteristics.

[0063] like Figure 4 As shown, in some embodiments, the outer perimeter of the cross-section of the air intake branch channel 125 and the hydrogen intake branch channel 123 are both rectangular, and the flow regulating element in the air intake branch channel 125 and the hydrogen intake branch channel 123 is a diaphragm valve. The diaphragm valve actuator 116 of the diaphragm valve is provided on the intake valve plate 1, and the diaphragm valve diaphragm 117 of the diaphragm valve is located in the corresponding air intake branch channel 125 or hydrogen intake branch channel 123. Specifically, after the intake cover plate 11 and the intake base plate 12 are fastened, a square groove is formed, and the groove size is 10mm*20mm. The diaphragm valve actuator 116 is installed on the intake cover plate 11. When it is necessary to adjust the intake flow rate, the diaphragm valve diaphragm 117 opens and closes to adjust the intake volume.

[0064] In some embodiments, each of the plurality of battery stacks 21 has an air outlet, a hydrogen outlet, and a heat transfer medium outlet at its second end in a first direction.

[0065] The battery stack assembly 2 has an exhaust valve plate 3 at one end facing away from the air inlet valve plate 1 in the first direction. The thickness direction of the exhaust valve plate 3 is the first direction. The exhaust valve plate 3 is adjacent to the second end of the battery stack 21 in the first direction. The exhaust valve plate 3 has an air outlet channel, a hydrogen outlet channel and a heat transfer medium channel that are spaced apart.

[0066] The air outlet flow channel comprises an air confluence outlet, an air outlet main flow channel and a plurality of air outlet branch flow channels in sequence, and the plurality of air outlet branch flow channels are in one-to-one correspondence with the air outlets of the plurality of battery stacks 21. In this way, the air discharged from the air outlets of the plurality of battery stacks 21 can be sequentially introduced into the plurality of air outlet branch flow channels, the air outlet main flow channel and the air confluence outlet and then discharged.

[0067] The hydrogen outlet flow channel comprises a hydrogen confluence outlet, a hydrogen outlet main flow channel and a plurality of hydrogen outlet branch flow channels in sequence, and the plurality of hydrogen outlet branch flow channels are in one-to-one correspondence with the hydrogen outlets of the plurality of battery stacks 21. In this way, the hydrogen discharged from the hydrogen outlets of the plurality of battery stacks 21 can be sequentially introduced into the plurality of hydrogen outlet branch flow channels, the hydrogen outlet main flow channel and the hydrogen confluence outlet and then discharged.

[0068] The heat-conducting medium outlet flow channel comprises a heat-conducting medium confluence outlet, a heat-conducting medium outlet main flow channel and a plurality of heat-conducting medium outlet branch flow channels in sequence, and the plurality of heat-conducting medium outlet branch flow channels are in one-to-one correspondence with the heat-conducting medium outlets of the plurality of battery stacks 21. In this way, the heat-conducting medium discharged from the heat-conducting medium outlets of the plurality of battery stacks 21 can be sequentially introduced into the plurality of heat-conducting medium outlet branch flow channels, the heat-conducting medium outlet main flow channel and the heat-conducting medium confluence outlet and then discharged.

[0069] In some embodiments, the exhaust valve plate 3 comprises an exhaust base plate 31 and an exhaust cover plate 32, and the thickness directions of the exhaust cover plate 32 and the exhaust base plate 31 are both the first direction. The air confluence outlet, the hydrogen confluence outlet and the heat-conducting medium confluence outlet are arranged on the exhaust cover plate 32. The exhaust cover plate 32 and the exhaust base plate 31 are connected to define the air outlet main flow channel, the air outlet branch flow channel, the hydrogen outlet main flow channel, the hydrogen outlet branch flow channel, the heat-conducting medium outlet main flow channel and the heat-conducting medium outlet branch flow channel. Specifically, the design idea and structure of the exhaust valve plate 3 are similar to those of the intake valve plate 1 for exhaust. For example, the intake valve plate 1 and the exhaust valve plate 3 can be made of aluminum alloy, polytetrafluoroethylene, stainless steel or the like.

[0070] In some embodiments, the inlet of the battery stack 21, the outlet of the battery stack 21, the outlet of the air inlet valve plate 1 and the inlet of the air outlet valve plate 3 are all provided with threads. The outlet of the air inlet valve plate 1 and the inlet of the battery stack 21 are communicated through a threaded sleeve and a connecting pipe 22. The outlet of the battery stack 21 and the inlet of the air outlet valve plate 3 are communicated through a threaded sleeve and a connecting pipe 22. Specifically, the inlet of the battery stack 21 includes an air inlet, a hydrogen inlet and a heat conducting medium inlet, and the outlet of the battery stack 21 includes an air outlet, a hydrogen outlet and a heat conducting medium outlet. The outlet of the air inlet valve plate 1 includes the outlets of the air inlet flow channel, the hydrogen inlet flow channel and the heat conducting medium flow channel, and the inlet of the air outlet valve plate 3 includes the inlets of the air outlet flow channel, the hydrogen outlet flow channel and the heat conducting medium flow channel. The threads are provided at the inlet of the battery stack 21, the outlet of the battery stack 21, the outlet of the air inlet valve plate 1 and the inlet of the air outlet valve plate 3, so that the connecting pipe 22 can be communicated with the corresponding inlet and outlet through the threaded sleeves at both ends of the connecting pipe 22, and each battery stack 21 is connected with the air inlet valve plate 1 and the air outlet valve plate 3 through the connecting pipe 22 (a pipe sealing piece), the pipe sealing piece is wrapped around the connecting pipe 22 and the threaded sleeves on both sides, and the threaded sleeves are fastened on the threaded holes of the end plate of the battery stack 21, the air inlet valve plate 1 and the air outlet valve plate 3, respectively. Therefore, the air, hydrogen and heat conducting medium of the fuel cell multi-stack integrated device according to the embodiment of the utility model are conveniently transported.

[0071] The fuel cell multi-stack integrated device according to the embodiment of the utility model is provided with the air inlet valve plate 1 and the air outlet valve plate 3, and the air inlet valve plate 1 and the air outlet valve plate 3 are located on the two sides of the stack assembly 2 in the first direction, the air inlet valve plate 1 can simultaneously provide air, hydrogen and heat conducting medium for multiple battery stacks 21, and the air outlet valve plate 3 can accept the air, hydrogen and heat conducting medium discharged by the multiple battery stacks 21. The structural integration and the consistency of the equipment when multiple stacks are connected in parallel can be greatly improved, a large number of pipe joints, elbow welding, valve body disassembly and the like are reduced, more parallel operation and operation state control of the battery stacks 21 are realized, and a very complex air inlet and outlet pipeline does not need to be constructed. The convenience and standardization of the integration of the battery stacks 21 are improved.

[0072] The flow channel inside the inlet valve plate can realize the preliminary distribution of the gas. However, due to the different distances from the main flow channel connector to the inlets of the branch flow channels, the flow resistance is different, and under the low inlet pressure of the high-temperature fuel cell stack, the flow distribution may be uneven. To solve this problem, the fuel cell multi-stack integrated device according to the embodiment of the present application is provided with a flow regulating member matched with each air inlet branch flow channel 125 and each hydrogen inlet branch flow channel 123, so as to regulate the flow. The fuel cell multi-stack integrated device according to the embodiment of the present application is provided with an inlet pressure sensor and a stack voltage sensor of each cell stack 21 outside the stack assembly 2, which can monitor the inlet pressure and the stack voltage of the cell stack 21 in real time during the operation of the cell stack 21, and the operating pressure of the fuel cell multi-stack integrated device according to the embodiment of the present application is lower than 0.1 Mpa. If the voltage drops too fast or the inlet pressure is too low during the load, the opening of the flow regulating member will be increased, and the inlet flow of the single stack will be increased. Thus, the flow distribution of air and hydrogen is realized, the cell stack 21 is ensured to work in the high-efficiency range, and the service life of the cell stack 21 is prolonged.

[0073] Therefore, the fuel cell multi-stack integrated device according to the embodiment of the present application has the advantages of high integration, easy disassembly and adjustment of the inlet flow.

[0074] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0075] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0076] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0077] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0078] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0079] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. The ordinary skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A fuel cell multi-stack integrated device, characterized by comprising: The application relates to a fuel cell multi-stack integrated device. The device comprises: a stack assembly comprising a plurality of cell stacks, each of the plurality of cell stacks being provided with an air inlet, a hydrogen inlet and a heat conducting medium inlet at a first end thereof in a first direction; an air inlet valve plate, a thickness direction of the air inlet valve plate being the first direction, the air inlet valve plate being adjacent to the first end of the cell stacks in the first direction, the air inlet valve plate being provided with an air inlet flow channel, a hydrogen inlet flow channel and a heat conducting medium flow channel at intervals; the air inlet flow channel comprises an air inlet manifold, an air inlet main flow channel and a plurality of air inlet branch flow channels connected in sequence, the plurality of air inlet branch flow channels being in one-to-one correspondence with the air inlets of the plurality of cell stacks, and air flow in the air inlet branch flow channels being adjustable; the hydrogen inlet flow channel comprises a hydrogen inlet manifold, a hydrogen inlet main flow channel and a plurality of hydrogen inlet branch flow channels connected in sequence, the plurality of hydrogen inlet branch flow channels being in one-to-one correspondence with the hydrogen inlets of the plurality of cell stacks, and hydrogen flow in the hydrogen inlet branch flow channels being adjustable; the heat conducting medium flow channel comprises a heat conducting medium manifold, a heat conducting medium inlet main flow channel and a plurality of heat conducting medium inlet branch flow channels connected in sequence, the plurality of heat conducting medium inlet branch flow channels being in one-to-one correspondence with the heat conducting medium inlets of the plurality of cell stacks.

2. The fuel cell multi-stack integrated device according to claim 1, wherein: the plurality of cell stacks of the stack assembly are arranged in parallel in a second direction; a length direction of the air inlet main flow channel is the second direction, a width direction of the air inlet main flow channel is a third direction, and the plurality of air inlet branch flow channels are arranged at intervals in the second direction, any two of the first direction, the second direction and the third direction being perpendicular to each other; a length direction of the hydrogen inlet main flow channel is the second direction, a width direction of the hydrogen inlet main flow channel is the third direction, and the plurality of hydrogen inlet branch flow channels are arranged at intervals in the second direction; each of the air inlet branch flow channels and each of the hydrogen inlet branch flow channels is provided with a flow adjusting member.

3. The fuel cell multi-stack integrated device according to claim 2, wherein: the air inlet main flow channel is a rectangular groove, and a width of the air inlet main flow channel is greater than or equal to 40 mm; the air inlet branch flow channel is in communication with the air inlet main flow channel and the air inlet at two ends thereof in the third direction; the flow adjusting member in the air inlet branch flow channel is located at a middle position of the air inlet branch flow channel in the third direction; the hydrogen inlet main flow channel is a rectangular groove, and a width of the hydrogen inlet main flow channel is greater than or equal to 40 mm; the hydrogen inlet branch flow channel is in communication with the hydrogen inlet main flow channel and the hydrogen inlet at two ends thereof in the third direction; the flow adjusting member in the hydrogen inlet branch flow channel is located at a middle position of the hydrogen inlet branch flow channel in the third direction.

4. The fuel cell multi-stack integrated device according to claim 2, characterized by The cross-sectional outer periphery profile of the air intake branch flow channel and the hydrogen intake branch flow channel is circular, the flow regulating member in the air intake branch flow channel and the hydrogen intake branch flow channel is a butterfly valve, the butterfly valve driver of the butterfly valve is arranged on the intake valve plate, and the butterfly valve disc of the butterfly valve is located in the corresponding air intake branch flow channel or hydrogen intake branch flow channel.

5. The fuel cell multi-stack integrated device according to claim 2, characterized by The cross-sectional outer periphery profile of the air intake branch flow channel and the hydrogen intake branch flow channel is rectangular, the flow regulating member in the air intake branch flow channel and the hydrogen intake branch flow channel is a diaphragm valve, the diaphragm valve driver of the diaphragm valve is arranged on the intake valve plate, and the diaphragm membrane of the diaphragm valve is located in the corresponding air intake branch flow channel or hydrogen intake branch flow channel. 6.The fuel cell multi-stack integrated device according to claim 1, characterized in that, The intake valve plate comprises an intake cover plate and an intake base plate, and the thickness direction of the intake cover plate and the intake base plate is the first direction; The air confluence inlet, the hydrogen confluence inlet and the heat conduction medium confluence inlet are arranged on the intake cover plate; The intake cover plate and the intake base plate are connected to define the air intake main flow channel, the air intake branch flow channel, the hydrogen intake main flow channel, the hydrogen intake branch flow channel, the heat conduction medium liquid inlet main flow channel and the heat conduction medium liquid inlet branch flow channel.

7. The fuel cell multi-stack integrated device according to claim 6, characterized by A sealing member is arranged between the intake cover plate and the intake base plate, and the sealing member is used to seal the air intake main flow channel, the air intake branch flow channel, the hydrogen intake main flow channel, the hydrogen intake branch flow channel, the heat conduction medium liquid inlet main flow channel and the heat conduction medium liquid inlet branch flow channel.

8. The fuel cell multi-stack integrated device according to claim 7, characterized by The outer side of the air intake main flow channel, the air intake branch flow channel, the hydrogen intake main flow channel, the hydrogen intake branch flow channel, the heat conduction medium liquid inlet main flow channel and the heat conduction medium liquid inlet branch flow channel is provided with a sealing groove, and the sealing member is arranged in the sealing groove. 9.The fuel cell multi-stack integrated device according to any one of claims 1-8, characterized in that, Each of the plurality of cell stacks is provided with an air outlet, a hydrogen outlet and a heat conduction medium outlet at a second end in the first direction; The exhaust valve plate is arranged at one end of the stack assembly away from the intake valve plate in the first direction, the thickness direction of the exhaust valve plate is the first direction, the exhaust valve plate is adjacent to the second end of the cell stack in the first direction, and the exhaust valve plate has an air exhaust flow channel, a hydrogen exhaust flow channel and a heat conduction medium flow channel arranged at intervals; The air exhaust flow channel comprises an air confluence outlet, an air exhaust main flow channel and a plurality of air exhaust branch flow channels connected in sequence, and the plurality of air exhaust branch flow channels are in one-to-one correspondence with the air outlets of the plurality of cell stacks; The hydrogen exhaust flow channel comprises a hydrogen confluence outlet, a hydrogen exhaust main flow channel and a plurality of hydrogen exhaust branch flow channels connected in sequence, and the plurality of hydrogen exhaust branch flow channels are in one-to-one correspondence with the hydrogen outlets of the plurality of cell stacks; The heat-conducting medium flow channel comprises a heat-conducting medium confluence outlet, a heat-conducting medium outlet main flow channel and a plurality of heat-conducting medium outlet branch flow channels in sequence, and the plurality of heat-conducting medium outlet branch flow channels are in one-to-one correspondence with the heat-conducting medium outlets of the plurality of battery stacks.

10. The fuel cell multi-stack integrated device according to claim 9, wherein, The exhaust valve plate comprises an exhaust base plate and an exhaust cover plate, and the thickness direction of the exhaust cover plate and the exhaust base plate is the first direction; The air confluence outlet, the hydrogen confluence outlet and the heat-conducting medium confluence outlet are arranged on the exhaust cover plate; The exhaust cover plate and the exhaust base plate are connected to define the air outlet main flow channel, the air outlet branch flow channel, the hydrogen outlet main flow channel, the hydrogen outlet branch flow channel, the heat-conducting medium outlet main flow channel and the heat-conducting medium outlet branch flow channel; The stack assembly comprises six battery stacks; The inlet of the battery stack, the outlet of the battery stack, the outlet of the air valve plate and the inlet of the exhaust valve plate are all provided with threads; The outlet of the air valve plate and the inlet of the battery stack are communicated through a threaded sleeve and a connecting pipe; The outlet of the battery stack and the inlet of the exhaust valve plate are communicated through a threaded sleeve and a connecting pipe.

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