Fuel cell liquid supply pipeline and liquid supply method

Abstract

The invention discloses a fuel cell liquid supply pipeline and a liquid supply method, and solves the technical problem that the arrangement of a high-power electric pile liquid supply pipeline in the prior art affects the performance test of an electric pile. The fuel cell liquid supply pipe comprises a purging subsystem, at least one liquid supply subsystem and a liquid discharge pipeline, each liquid supply subsystem comprises a liquid supply source and a liquid supply pipeline, the liquid supply pipeline is provided with an in-pile safety valve and an electromagnetic valve, the in-pile safety valve is provided with an inlet, a first outlet and a second outlet, and the electromagnetic valve is communicated with a liquid inlet of an electric pile of a fuel cell; the purging subsystem comprises a purging gas source, a purging pipeline and an exhaust pipeline, and the other end of the purging pipeline is communicated with a liquid inlet of the electric pile; and the other end of the exhaust pipeline is communicated with the outside. According to the fuel cell liquid supply system, the liquid supply subsystems of multiple stacks can be connected, various tests of the fuel cell can be carried out, and the test accuracy is further improved under the condition that the liquid supply uniformity of cooling liquid of each electric pile entering the liquid inlet of the electric pile is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of fuel cells, and specifically relates to a fuel cell liquid supply pipeline and a liquid supply method. Background Art

[0002] With the increasing concern about environmental issues, fuel cells, as an efficient clean energy conversion technology, are becoming increasingly important. In the commercialization process of fuel cells, the performance testing of the stack has become a key link. As the core part of the fuel cell system, the reliability and efficiency of mass production testing of the stack are crucial to the development of the entire industry chain.

[0003] In the development of small and medium-power multi-stack fuel cells, a single stack can usually meet the requirements, because the amount of liquid inlet is not large and there are not many connecting pipelines. The layout of the liquid inlet pipeline at the front end of the stack has a relatively small impact on the performance of the stack, so the design and manufacturing process is relatively simple. However, for megawatt-level and super-high-power stacks, the situation is completely different, and multiple single stacks are required in parallel. Because there are many pipelines, it is impossible to ensure the uniformity of the distribution of the liquid inlet pipeline of each stack. Therefore, the layout of the front-end pipeline has a greater impact on the performance of the stack. Summary of the invention

[0004] In order to solve the current technical problem that the layout of the liquid supply pipeline of a high-power fuel cell stack will affect the performance test of the fuel cell stack, the present application provides a fuel cell liquid supply pipeline and a liquid supply method.

[0005] In a first aspect of the present application, a fuel cell liquid supply system is provided, comprising:

[0006] at least one liquid supply subsystem, the liquid supply subsystem comprising a liquid supply source and a liquid supply pipeline connected to the liquid supply source, the liquid supply pipeline being provided with a stack entry safety valve and a solenoid valve connected thereto, the stack entry safety valve being provided with an inlet connected to the liquid supply source, a first outlet connected to the solenoid valve, and a second outlet connected to the outside, the solenoid valve being connected to a liquid inlet of the fuel cell stack;

[0007] A purge subsystem, comprising a purge gas source, a purge pipeline and an exhaust pipeline both connected to the purge gas source, wherein the other end of the purge pipeline is connected to the liquid inlet of the stack, and the connection point is located downstream of the solenoid valve; the other end of the exhaust pipeline is connected to the outside;

[0008] The number of liquid discharge pipelines is the same as that of the liquid supply subsystems, one end of which is connected to the liquid outlet of the battery stack and the other end of which is connected to the outside.

[0009] In some embodiments, a first valve and a first check valve are connected between the purge gas source and the purge pipeline, and between the purge gas source and the exhaust pipeline;

[0010] A second valve is connected between the purge pipeline and the liquid inlet of the fuel cell stack;

[0011] A third valve is connected between the exhaust pipe and the outside world;

[0012] A fourth valve is provided between the liquid discharge pipeline and the outside.

[0013] In some embodiments, the pipeline connecting the liquid supply source and the liquid supply pipeline is provided with a second one-way valve, a fifth valve, a pressure reducing valve, a flow regulating valve, a flow meter, the stack entry safety valve, the solenoid valve and a sixth valve which are connected in sequence;

[0014] A third one-way valve is connected between the second outlet of the stack entry safety valve and a pipeline connected to the outside.

[0015] In some embodiments, the fuel cell liquid supply system further includes a circulation loop, the inlet of the circulation loop is connected to the liquid outlet of the fuel cell stack, the outlet of the circulation loop is connected to the liquid inlet of the fuel cell stack, and the connection point is located downstream of the solenoid valve.

[0016] In some embodiments, the circulation loop is provided with a self-circulating safety valve and a heat dissipation device in communication with each other in sequence;

[0017] The self-circulating safety valve is provided with an inlet connected to the liquid outlet of the battery stack, a third outlet connected to the heat dissipation device, and a fourth outlet connected to the outside.

[0018] In some embodiments, the fuel cell liquid supply system is applied to a fuel cell comprising a plurality of fuel cell stacks, and the number of the liquid supply subsystems is the same as the number of the fuel cell stacks;

[0019] The fuel cell liquid supply system further includes a self-compensating tube. The self-compensating tube in the liquid supply subsystem is communicated with the liquid supply pipeline and is connected in parallel to the inlet of the stack safety valve.

[0020] In some embodiments, the pipe body of the pipeline of the fuel cell liquid supply system includes a soft pipe and a hard pipe.

[0021] In some embodiments, the diameter of the purge pipeline is 1 / 10 to 1 / 8 of the diameter of the coolant pipeline;

[0022] At the connection point between the purge pipeline and the liquid supply pipeline, the gas pressure of the purge pipeline is greater than the liquid pressure in the liquid supply pipeline.

[0023] In a second aspect of the present application, a liquid supply method based on the above-mentioned fuel cell liquid supply system is provided, comprising the following steps:

[0024] In response to the test simulation stack startup signal, the purge pipeline and the exhaust pipeline are closed, the liquid supply pipeline is opened, and the cooling liquid provided by the liquid supply source enters the stack through the first outlet of the safety valve and the solenoid valve, and the cooling system of the stack starts to work;

[0025] In response to a test simulation stack shutdown signal, the liquid supply pipeline is closed, and the liquid discharge pipeline of the stack is opened, and the purge gas provided by the purge gas source enters the stack through the purge pipeline and the liquid supply pipeline, so as to purge the coolant inside the stack and discharge it through the liquid discharge pipeline;

[0026] After the purge is completed, the purge pipeline and the drain pipeline are closed.

[0027] In some embodiments, when the fuel cell liquid supply system includes a self-compensating tube, the liquid supply method includes the following steps:

[0028] In response to the test simulation stack startup signal, the exhaust pipeline and the purge pipeline are closed, the liquid supply pipeline and the self-compensation tube are opened, and the cooling liquid provided by the liquid supply source enters the stack through the first outlet of the stack entry safety valve and the solenoid valve, and the cooling system of the stack starts to work;

[0029] In response to a test simulation stack shutdown signal, the liquid supply pipeline is closed, and the liquid discharge pipeline of the stack is opened, and the purge gas provided by the purge gas source enters the stack through the purge pipeline and the liquid supply pipeline, so as to purge the coolant inside the stack and discharge it through the liquid discharge pipeline;

[0030] After the purge is completed, the purge pipeline and the drain pipeline are closed.

[0031] According to one or more embodiments of the present application, a fuel cell liquid supply pipeline and a liquid supply method are provided. The fuel cell liquid supply pipe includes a purge subsystem, at least one liquid supply subsystem and a liquid discharge pipeline with the same number as the liquid supply subsystem. The liquid supply subsystem includes a liquid supply source and a liquid supply pipeline connected to the liquid supply source. The liquid supply pipeline is provided with a stack entry safety valve and a solenoid valve connected to each other. The stack entry safety valve is provided with an inlet connected to the liquid supply source, a first outlet connected to the solenoid valve and a second outlet connected to the outside world. The solenoid valve is connected to a liquid inlet of a fuel cell stack. The purge subsystem includes a purge gas source and a purge pipeline and an exhaust pipeline both connected to the purge gas source. The other end of the purge pipeline is connected to the liquid inlet of the stack, and the connection point is located downstream of the solenoid valve. The other end of the exhaust pipeline is connected to the outside world. One end of the liquid discharge pipeline is connected to the liquid outlet of the stack, and the other end is connected to the outside world.

[0032] The present application provides at least one liquid supply subsystem. In the case of a single fuel cell stack, only one liquid supply subsystem may be required; in the case of multiple fuel cells, the same number of liquid supply subsystems as the stacks may be provided to meet the layout requirements of the liquid supply pipelines of multiple fuel cells. By setting a stack safety valve in the liquid supply pipeline, the liquid can be discharged to the outside when the pressure of the liquid supply source entering the stack is too high, avoiding the influence of excessive pressure on the liquid inlet of the stack. The solenoid valve can respond to the signal of the liquid in the stack. If the capacity of the coolant in the stack is too small, the liquid inlet of the stack can be replenished by opening the solenoid valve; if the capacity of the coolant in the stack meets the demand, the liquid supply to the liquid inlet of the stack can be stopped by closing the solenoid valve. That is, the pressure of the liquid inlet of the stack can be adjusted to a stable value through the stack safety valve, so as to improve the uniformity of the liquid supply of each stack and avoid the influence of the layout of the front-end pipeline on the performance test of the stack.

[0033] In addition, in response to the test simulation stack startup signal, the exhaust pipeline and the purge pipeline are closed, the liquid supply pipeline is opened, and the cooling liquid provided by the liquid supply source enters the stack through the first outlet of the stack safety valve and the solenoid valve, and the cooling system of the stack starts to work; in response to the test simulation stack shutdown signal, the liquid supply pipeline is closed, the drain pipeline of the stack is opened, and the purge gas provided by the purge gas source enters the stack through the purge pipeline and the liquid supply pipeline to purge the coolant inside the stack and discharge it through the drain pipeline; after the purge is completed, the purge gas source and the drain pipeline are closed. The present application can connect the liquid supply subsystems of multiple stacks to perform various tests on fuel cells, and further improve the accuracy of the test while improving the uniformity of the liquid supply of each stack coolant entering the liquid inlet of the stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic structural diagram of a fuel cell fluid supply system in one or more embodiments of the present application is shown.

[0035] Figure 2 Shows Figure 1 A schematic diagram of the structure of a fuel cell fluid supply system with multiple stacks;

[0036] Figure 3 Shows Figure 2 Schematic diagram of the structure of the liquid supply subsystem and discharge pipeline of the fuel cell stack a.

[0037] Figure 4 Shows Figure 2 Schematic diagram of the structure of the liquid supply subsystem and discharge pipeline of the fuel cell stack b.

[0038] Figure 5 Shows Figure 2 Schematic diagram of the structure of the liquid supply subsystem and discharge pipeline of the fuel cell stack c.

[0039] Figure 6 Shows Figure 2 Schematic diagram of the structure of the liquid supply subsystem and discharge pipeline of the fuel cell stack d.

[0040] Figure 7 Shows Figure 2 Schematic diagram of the structure of the liquid supply subsystem and discharge pipeline of the fuel cell stack e.

[0041] Description of reference numerals: 100 - fuel cell liquid supply system, 110 - liquid supply subsystem, 111 - liquid supply source, 112 - liquid supply pipeline, 1121 - second one-way valve, 1122 - fifth valve, 1123 - pressure reducing valve, 1124 - flow regulating valve, 1125 - flow meter, 1126 - stack entry safety valve, 11261 - third one-way valve, 1127 - solenoid valve, 1128 - sixth valve; 120 - blow Sweeping subsystem, 121-purge gas source, 122-purge pipeline, 1221-second valve, 123-exhaust pipeline, 1231-third valve, 124-first valve, 125-first one-way valve; 130-drain pipeline, 131-fourth valve; 140-circulation loop, 141-self-circulation safety valve, 142-heat dissipation device, 143-fourth one-way valve; 150-self-compensating tube; 200-fuel cell stack. DETAILED DESCRIPTION

[0042] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0043] See also Figure 1 and attached Figure 2In a first aspect of the present application, a fuel cell liquid supply system is provided. The fuel cell liquid supply system 100 includes a purge subsystem 120, at least one liquid supply subsystem 110, and a number of drain pipes 130 equal to the number of the liquid supply subsystems 110. The liquid supply subsystem 110 includes a liquid supply source 111 and a liquid supply pipe 112 connected to the liquid supply source 111. The liquid supply pipe 112 is provided with a stack entry safety valve 1126 and a solenoid valve 1127 connected to each other. The stack entry safety valve 1126 is provided with an inlet connected to the liquid supply source 111, an inlet connected to the solenoid valve 1127, and a discharge pipe 130 connected to the liquid supply subsystem 110. The solenoid valve 1127 is connected to the liquid inlet of the fuel cell stack 200; the purge subsystem 120 includes a purge gas source 121 and a purge pipeline 122 and an exhaust pipeline 123 which are both connected to the purge gas source 121, the other end of the purge pipeline 122 is connected to the liquid inlet of the fuel cell stack 200, and the connection point is located downstream of the solenoid valve 1127, and the other end of the exhaust pipeline 123 is connected to the outside world; one end of the drain pipeline 130 is connected to the liquid outlet of the fuel cell stack 200, and the other end is connected to the outside world.

[0044] As attached Figure 1 and attached Figure 2 As shown, the liquid supply subsystem 110 includes a coolant subsystem, which is used to provide coolant for the fuel cell to maintain the fuel cell operating at a suitable temperature. Before entering the liquid inlet of the fuel cell stack 200, a stack safety valve 1126 and a solenoid valve 1127 are provided in the liquid supply pipeline 112, which can ensure the stability of the pressure entering the liquid inlet of the fuel cell stack 200. The stack safety valve 1126 can send the coolant that meets the requirements into the liquid inlet of the stack 200 through the first outlet, and the stack safety valve 1126 can discharge the excess coolant through the second outlet to ensure that the liquid inlet pressure of the fuel cell meets the requirements, thereby ensuring the performance of the fuel cell stack 200. In some embodiments, the liquid source of the liquid supply source 111 is filtered and the first stage of decompression is connected to the pipeline of the embodiment of the present application.

[0045] As attached Figure 1 and attached Figure 2 As shown, the purge gas source 121 in the purge subsystem 120 can be nitrogen or an inert gas. By connecting the purge pipeline 122 with the liquid supply pipeline 112, the liquid supply pipeline 112 can be purged after the battery stack 200 is shut down. The purge gas in the purge pipeline 122 purges the liquid supply pipeline 112 and the coolant inside the battery stack 200 to prevent the coolant of the battery stack 200 from accumulating and overflowing in the battery stack 200 after the battery stack 200 is disassembled after the test is completed.

[0046] As attached Figure 1 and attached Figure 2As shown, one end of the drain pipe 130 is connected to the liquid outlet of the battery stack 200, and the other end is connected to the outside. The purge gas in the purge pipe 122 purges the coolant in the liquid supply pipe 112 and the battery stack 200, and the coolant can be discharged directly to avoid remaining in the battery stack 200.

[0047] The liquid supply subsystem of the present application may be single or multiple, that is, it can meet the needs of a single stack or multiple stacks of fuel cells.

[0048] Therefore, in the case of a single fuel cell stack, only one liquid supply subsystem 110 may be required. In the case of multiple fuel cells, the same number of liquid supply subsystems 110 as the stack 200 may be provided to meet the layout requirements of the liquid supply pipelines 112 of multiple fuel cells. By setting a stack safety valve 1126 in the liquid supply pipeline 112, when the pressure of the liquid supply source 111 entering the stack is too high, it can be discharged to the outside to avoid the influence of excessive pressure on the liquid inlet of the stack 200. The solenoid valve 1127 can respond to the signal of the liquid in the stack 200. If the capacity of the coolant in the stack 200 is too small, the liquid inlet of the stack 200 can be replenished by opening the solenoid valve 1127; if the capacity of the coolant in the stack 200 meets the demand, the liquid supply to the liquid inlet of the stack 200 can be stopped by closing the solenoid valve 1127.

[0049] In addition, in response to the test simulation battery stack 200 startup signal, the exhaust line 123 and the purge line 122 are closed, and the liquid supply line 112 is opened. The cooling liquid provided by the liquid supply source 111 enters the battery stack 200 through the first outlet of the inlet safety valve 1126 and the solenoid valve 1127, and the cooling system of the battery stack 200 starts to work; in response to the test simulation battery stack 200 shutdown signal, the liquid supply line 112 is closed, and the drain line 130 of the battery stack 200 is opened. The purge gas provided by the purge gas source 121 enters the battery stack 200 through the purge line 122 and the liquid supply line 112 to purge the coolant inside the battery stack 200 and discharge it through the drain line 130; after the purge is completed, the purge gas source 121 and the drain line 130 are closed. The present application can connect multiple stacks of liquid supply subsystems 110 to perform various tests on the fuel cell, thereby improving the accuracy of the test while ensuring that the pressure of the coolant entering the liquid inlet of each stack 200 is the same.

[0050] As attached Figure 1 and attached Figure 2As shown, in some embodiments, a first valve 124 and a first non-return valve 125 are connected between the purge gas source 121 and the purge pipeline 122, as well as between the purge gas source 121 and the exhaust pipeline 123; the first valve 124 can be a manual valve or an electric valve; the first non-return valve 125 ensures that the purge gas of the purge gas source 121 flows in one direction along the purge pipeline 122 or the exhaust pipeline 123, and prevents the gas from flowing in the opposite direction. The gas of the purge gas source 121 can enter the purge pipeline 122 through the first valve 124 and the first non-return valve 125. After the purge is completed, the residual gas in the pipeline can be discharged to the atmosphere through the exhaust pipeline 123.

[0051] As attached Figure 1 and attached Figure 2 As shown, in some embodiments, a second valve 1221 is connected between the purge line 122 and the liquid inlet of the fuel cell stack 200, and the second valve 1221 can be a manual valve or an electric valve; when the fuel cell stack 200 is shut down, the second valve 1221 can be opened to purge the liquid inlet of the fuel cell stack 200, thereby purging the coolant in the fuel cell stack 200 to the outside, so as to prevent the coolant from remaining inside the fuel cell stack 200 after the fuel cell stack 200 is shut down.

[0052] As attached Figure 1 and attached Figure 2 As shown, in some embodiments, a third valve 1231 is connected between the exhaust pipeline 123 and the outside; the third valve 1231 can be a manual valve or an electric valve; after the purge is completed, the residual gas in the pipeline can be discharged into the atmosphere by opening the third valve 1231.

[0053] As attached Figure 1 and attached Figure 2 As shown, in some embodiments, a fourth valve 131 is connected between the drain line 130 and the outside. The fourth valve 131 can be a manual valve or an electric valve; when the purge gas in the purge line 122 purges the coolant inside the stack 200, the coolant can be directly discharged by opening the fourth valve 131 to avoid remaining in the stack 200.

[0054] As attached Figure 1 and attached Figure 2As shown, in some embodiments, the pipeline connecting the liquid supply source 111 and the liquid supply pipeline 112 is provided with a second one-way valve 1121, a fifth valve 1122, a pressure reducing valve 1123, a flow regulating valve 1124, a flow meter 1125, a stacking safety valve 1126, a solenoid valve 1127 and a sixth valve 1128 which are connected in sequence. The second one-way valve 1121 prevents the liquid in the liquid supply pipeline 112 from flowing back into the liquid supply source 111 when the pressure at the liquid supply end is too low; the fifth valve 1122 can be a manual valve or an electric valve. Opening the fifth valve 1122 can allow the coolant from the liquid supply source 111 to flow into the liquid supply pipeline 112; the pressure reducing valve 1123 can reduce the liquid pressure in the liquid supply pipeline 112 to ensure the stability of the liquid pressure in the liquid supply pipeline 112. The pressure reducing valve 1123 is provided with a display, and the liquid pressure in the liquid supply pipeline 112 can be determined by the display, and then the liquid pressure in the liquid supply pipeline 112 is adjusted by the pressure reducing valve 1123 to ensure that the liquid pressure in the liquid supply pipeline 112 meets the pressure requirement of the liquid in the liquid supply pipeline 112. The flow regulating valve 1124 can control the flow of the liquid by adjusting the opening of the flow regulating valve 1124 to meet the specific requirements of the system for the flow. The flow meter 1125 can measure the speed and flow of the fluid flowing in the pipeline, thereby realizing accurate control and monitoring of the fluid system. The stack safety valve 1126 is an automatic valve. When the pressure of the liquid supply line 112 at the liquid inlet of the fuel cell stack 200 exceeds the set safety value, the second outlet of the stack safety valve 1126 automatically opens to release the pressure to prevent the danger caused by excessive liquid pressure, thereby protecting the safety of the liquid supply line 112 and the fuel cell. When the pressure of the liquid supply line 112 drops to a safe level, the second outlet of the stack safety valve 1126 will automatically close to prevent the medium from continuing to be discharged, ensuring that the liquid in the liquid supply line 112 can be passed into the liquid inlet of the fuel cell stack 200 at an appropriate pressure.

[0055] Therefore, in response to the test simulation stack 200 startup signal, the exhaust pipeline 123 and the purge pipeline 122 are closed, and the liquid supply pipeline 112 is opened, that is, the second one-way valve 1121, the fifth valve 1122, the pressure reducing valve 1123, the flow regulating valve 1124, the flow meter 1125, the stack entry safety valve 1126, the solenoid valve 1127 and the sixth valve 1128 are all opened, and the cooling liquid provided by the liquid supply source 111 enters the liquid inlet of the stack 200 through the second one-way valve 1121, the fifth valve 1122, the pressure reducing valve 1123, the flow regulating valve 1124, the flow meter 1125, the stack entry safety valve 1126, the solenoid valve 1127 and the sixth valve 1128, and the cooling system of the stack 200 starts to work.

[0056] As attached Figure 1 and attached Figure 2As shown, in some embodiments, a third one-way valve 11261 is connected between the second outlet of the stack safety valve 1126 and the pipeline connected to the outside. The third one-way valve 11261 prevents liquid from flowing back into the second outlet of the stack safety valve 1126. The liquid at the second outlet of the stack safety valve 1126 can be discharged in time.

[0057] In some embodiments, the fuel cell liquid supply system 100 further includes a circulation loop 140, the inlet of the circulation loop 140 is connected to the liquid outlet of the fuel cell stack 200, the outlet of the circulation loop 140 is connected to the liquid inlet of the fuel cell stack 200, and the connection point is located downstream of the solenoid valve 1127. The circulation loop 140 can cool down and recycle the liquid at the liquid outlet of the fuel cell stack 200.

[0058] As attached Figure 1 and attached Figure 2 As shown, in some embodiments, the circulation loop 140 is provided with a self-circulating safety valve 141 and a heat sink 142 in communication in sequence; the self-circulating safety valve 141 is provided with an inlet connected to the liquid outlet of the fuel cell stack 200, a third outlet connected to the heat sink 142, and a fourth outlet connected to the outside. The heat sink 142 includes a radiator and a water pump. The heat sink 142 of the present application can refer to the heat sink 142 of the prior art, and the present application does not describe it in detail. The self-circulating safety valve 141 is an automatic valve. When the pressure of the supply circulation loop 140 exceeds the set safety value, the fourth outlet of the self-circulating safety valve 141 automatically opens to release the pressure to prevent the liquid pressure from being too high and causing danger, thereby protecting the safety of the circulation loop 140 and the fuel cell. When the pressure of the circulation loop 140 is reduced to a safe level, the fourth outlet of the self-circulating safety valve 141 will automatically close to prevent the medium from continuing to be discharged, so as to ensure that the liquid in the circulation loop 140 can enter the circulation loop 140 at a suitable pressure. In some embodiments, the pipeline connecting the self-circulating safety valve 141 and the outside is further provided with a fourth one-way valve 143, which prevents the liquid from flowing back into the fourth outlet of the self-circulating safety valve 141. The liquid at the fourth outlet of the self-circulating safety valve 141 can be discharged in time.

[0059] As attached Figure 2 As shown, in some embodiments, the fuel cell liquid supply system is applied to a fuel cell comprising multiple fuel cell stacks 200, and the number of liquid supply subsystems 110 is the same as the number of fuel cell stacks 200; in the case of a single fuel cell stack, only one liquid supply subsystem 110 may be required, and in the case of multiple fuel cell stacks, the same number of liquid supply subsystems 110 as the fuel cell stacks 200 may be provided to meet the layout requirements of the liquid supply pipelines 112 of the multiple fuel cell stacks.

[0060] As attached Figure 2As shown, in some embodiments, the fuel cell fluid supply system is applied to a fuel cell comprising a plurality of fuel cell stacks 200 , and the number of fluid supply subsystems 110 is the same as the number of fuel cell stacks 200 , for example, if there are five fuel cell stacks 200 , there are five fluid supply subsystems 110 .

[0061] As attached Figure 2 As shown, in some embodiments, the fuel cell liquid supply system 100 further includes a self-compensating tube 150, and the self-compensating tube 150 in the liquid supply subsystem 110 is connected to the liquid supply pipeline 112 and connected in parallel to the inlet of the stack safety valve 1126. In some embodiments, the self-compensating tube 150 of the liquid supply subsystem 110 can connect the liquid supply pipeline 112 in each battery stack 200 in the liquid supply subsystem 110 at the inlet of the stack safety valve 1126. For example, if five battery stacks 200 are connected in parallel, the self-compensating tube 150 is connected to the liquid supply pipelines 112 of the five liquid supply subsystems 110. It is further ensured that the pressure of the liquid supply pipeline 112 of each liquid supply subsystem 110 is equal before entering the stack, and the flow of each single stack is automatically compensated. Before entering the stack, some of the liquid supply pipelines 112 may have slightly higher pressures, while others may have slightly lower pressures. By connecting the self-compensating pipe 150 to the liquid supply pipelines 112 of the five liquid supply subsystems 110, the liquid in the liquid supply pipeline 112 with slightly higher pressure will automatically flow into the liquid supply pipeline 112 with slightly lower pressure, thereby automatically compensating for the liquid inlet flow of each single stack, and to a certain extent, fine-tuning the pressure before entering the stack, thereby ensuring that the pressures of the liquid supply pipelines 112 of each liquid supply subsystem 110 are equal before entering the stack.

[0062] As attached Figure 1 and attached Figure 2 As shown, in some embodiments, the pipe body of the pipeline of the fuel cell liquid supply system 100 includes a hose and a hard pipe. For example: the liquid supply pipeline 112 of the multi-fuel stack 200, the pipe body upstream of the pressure reducing valve 1123 can be a hose, and the pipe body downstream of the pressure reducing valve 1123 can be a hard pipe. The length and turning angle of the pipe body downstream of the corresponding pressure reducing valve 1123 of each liquid supply subsystem 110 are the same, ensuring that the pressure of each liquid supply subsystem 110 after pressure reduction will not change significantly. If a hose is used, the pressure after pressure reduction may change according to the change in the position of the hose, thereby failing to ensure the pressure before entering the stack.

[0063] As attached Figure 1 and attached Figure 2As shown, in other embodiments, a hose can be used upstream of the connection point where the purge line 122 is connected to the liquid supply line 112. The connection between the purge line 122 and the liquid supply line 112 is mainly used to purge the liquid after the battery stack 200 is shut down, and the changes in pressure and flow rate will not be considered. A hose is used upstream of the connection point where the purge line 122 is connected to the liquid supply line 112 to facilitate the connection of more pipelines. In addition, the connection of the hose needs to ensure that the connection between the pipelines is not knotted. Ensure the smoothness of the pipeline connection.

[0064] As attached Figure 1 and attached Figure 2 As shown, in some embodiments, the diameter of the purge line 122 is 1 / 10 to 1 / 8 of the diameter of the coolant line, and the diameter of the purge line 122 can be 1 / 10, 1 / 9 or 1 / 8 of the diameter of the coolant line; at the connection between the purge line 122 and the liquid supply line 112, the gas pressure of the purge line 122 is greater than the liquid pressure in the liquid supply line 112, ensuring that the gas pressure of the purge line 122 can purge and discharge the liquid in the liquid supply line 112 connected to the purge line 122. After the battery stack 200 is shut down, the liquid in the battery stack 200 is purged in time to prevent the coolant from flowing back into the purge line 122. In some embodiments, the position of the purge line 122 is higher than that of the liquid supply line 112.

[0065] In a second aspect of the present application, a liquid supply method based on the above-mentioned fuel cell liquid supply system 100 is provided, comprising the following steps:

[0066] In response to the test simulation stack 200 startup signal, the exhaust pipeline 123 and the purge pipeline 122 are closed, the liquid supply pipeline 112 is opened, and the cooling liquid provided by the liquid supply source 111 enters the stack 200 through the first outlet of the safety valve and the solenoid valve 1127, and the cooling system of the stack 200 starts to work;

[0067] In response to the shutdown signal of the test simulation stack 200, the liquid supply pipeline 112 is closed, and the drain pipeline 130 of the stack 200 is opened, and the purge gas provided by the purge gas source 121 enters the stack 200 through the purge pipeline 122 and the liquid supply pipeline 112, so as to purge the coolant inside the stack 200 and discharge it through the drain pipeline 130;

[0068] After the purge is completed, the purge gas source 121 and the drain pipe 130 are closed.

[0069] In some embodiments, when the fuel cell liquid supply system 100 includes the self-compensating tube 150, the liquid supply method includes the following steps:

[0070] In response to the test simulation stack 200 startup signal, the exhaust pipeline 123 and the purge pipeline 122 are closed, the liquid supply pipeline 112 and the self-compensation pipe 150 are opened, and the cooling liquid provided by the liquid supply source 111 enters the stack 200 through the first outlet of the stack safety valve 1126 and the solenoid valve 1127, and the cooling system of the stack 200 starts to work; for example: if 5 stacks 200 are connected in parallel, the self-compensation pipe 150 is connected to the liquid supply pipelines 112 of the 5 liquid supply subsystems 110. It is further ensured that the pressure of the liquid supply pipeline 112 of each liquid supply subsystem 110 is equal before entering the stack, and the flow of each single stack is automatically compensated. Before entering the stack, some of the liquid supply pipelines 112 may have slightly higher pressures, while others may have slightly lower pressures. By connecting the self-compensating pipe 150 to the liquid supply pipelines 112 of the five liquid supply subsystems 110, the liquid in the liquid supply pipeline 112 with slightly higher pressure will automatically flow into the liquid supply pipeline 112 with slightly lower pressure, thereby automatically compensating for the liquid inlet flow of each single stack, and to a certain extent, fine-tuning the pressure before entering the stack, thereby ensuring that the pressures of the liquid supply pipelines 112 of each liquid supply subsystem 110 are equal before entering the stack.

[0071] In response to the shutdown signal of the test simulation stack 200, the liquid supply pipeline 112 is closed, and the drain pipeline 130 of the stack 200 is opened, and the purge gas provided by the purge gas source 121 enters the stack 200 through the purge pipeline 122 and the liquid supply pipeline 112, so as to purge the coolant inside the stack 200 and discharge it through the drain pipeline 130;

[0072] After the purge is completed, the purge gas source 121 and the drain pipe 130 are closed.

[0073] As attached Figure 2 , Attachment Figure 3 , Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 and attached Figure 7 As shown, this embodiment takes five single-stack high-power fuel cell stacks 200, namely single stack a, single stack b, single stack c, single stack d and single stack e, the liquid supply subsystem 110 is a coolant subsystem, and the gas of the purge gas source 121 is nitrogen as an example for explanation. The liquid supply pipeline 112, the purge pipeline 122 and the exhaust pipeline 123 have all been considered for sealing, and all the one-way valves are normally open, that is, the first one-way valve 125, the second one-way valve 1121, the third one-way valve 11261, and the fourth one-way valve 143 are all normally open.

[0074] In response to the test simulation stack 200 startup signal, the exhaust pipeline 123 and the purge pipeline 122 are closed, the liquid supply pipeline 112 and the self-compensation tube 150 are opened, and the cooling liquid provided by the liquid supply source 111 enters the stack 200 through the first outlet of the stack safety valve 1126 and the solenoid valve 1127, and the cooling system of the stack 200 starts to work; the first valve 124 and the third valve 1231 of the purge pipeline 122 are closed, and the second valve a1221, the second valve b1221, the second valve c1221, and the second valve d122 connected to the single stack by nitrogen are closed. 1 and the second valve e1221, close the fourth valve a131, the fourth valve b131, the fourth valve c131, the fourth valve d131 and the fourth valve e131 of each single stack discharge pipeline 130, and then open the fifth valve a1122, the fifth valve b1122, the fifth valve c1122, the fifth valve d1122 and the fifth valve e1122 of each single stack continuous liquid supply end, and open the sixth valve a1128, the sixth valve b1128, the sixth valve c1128, the sixth valve d1128 and the sixth valve e1128 before the single stack. Then start the relevant performance test of the fuel cell multi-stack.

[0075] In response to the shutdown signal of the test simulation fuel cell 200, the liquid supply pipeline 112 is closed, and the drain pipeline 130 of the fuel cell 200 is opened. The purge gas provided by the purge gas source 121 enters the fuel cell 200 through the purge pipeline 122 and the liquid supply pipeline 112 to purge the coolant inside the fuel cell 200 and discharge it through the drain pipeline 130; after the test is completed, the purge is performed, and the fifth valve a1122, the fifth valve b1122, the fifth valve c1122, the fifth valve d1122 and the fifth valve e1122 of each single stack connected to the liquid supply end are closed, and the sixth valve a1128, the sixth valve b1128, the sixth valve c1128, the sixth valve d1128 and the sixth valve e1128 in front of each single stack are closed. Open the fourth valve a131, the fourth valve b131, the fourth valve c131, the fourth valve d131 and the fourth valve e131 of the liquid discharge pipeline 130 of each single stack, then open the first valve 124 of the purge pipeline 122, and the second valve a1221, the second valve b1221, the second valve c1221, the second valve d1221 and the second valve e1221 of the nitrogen connecting each single stack, and then start purging.

[0076] After the purge is completed, the purge gas source 121 and the liquid discharge pipeline 130 are closed. After the purge is completed, the first valve 124 of the purge pipeline 122, the second valve a1221, the second valve b1221, the second valve c1221, the second valve d1221 and the second valve e1221 of the nitrogen connected to each single stack are closed in sequence, and the fourth valve a131, the fourth valve b131, the fourth valve c131, the fourth valve d131 and the fourth valve e131 of the liquid discharge pipe of each single stack are closed; the third valve 1231 is opened to discharge the gas in the pipeline to the outside, and then the third valve 1231 is closed.

[0077] The liquid supply pipeline 112 and the liquid supply method in the embodiment of the present application can be applied to the relevant tests of the liquid supply system 100 of the fuel cell stack 200, and can also be applied to the maintenance of the vehicle stack 200. If back pressure is required in the test, a back pressure valve can be added to the rear pipeline of the stack 200 outlet. This application will not be described in detail.

[0078] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0079] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element 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 application.

[0080] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0081] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0082] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A fuel cell liquid supply system, characterized in that: include: at least one liquid supply subsystem, the liquid supply subsystem comprising a liquid supply source and a liquid supply pipeline connected to the liquid supply source, the liquid supply pipeline being provided with a stack entry safety valve and a solenoid valve connected thereto, the stack entry safety valve being provided with an inlet connected to the liquid supply source, a first outlet connected to the solenoid valve, and a second outlet connected to the outside, the solenoid valve being connected to a liquid inlet of the fuel cell stack; A purge subsystem, comprising a purge gas source, a purge pipeline and an exhaust pipeline both connected to the purge gas source, wherein the other end of the purge pipeline is connected to the liquid inlet of the stack, and the connection point is located downstream of the solenoid valve; the other end of the exhaust pipeline is connected to the outside; The number of liquid discharge pipelines is the same as that of the liquid supply subsystems, one end of which is connected to the liquid outlet of the battery stack and the other end of which is connected to the outside.

2. The fuel cell liquid supply system according to claim 1, characterized in that: A first valve and a first check valve are connected between the purge gas source and the purge pipeline, and between the purge gas source and the exhaust pipeline; A second valve is connected between the purge pipeline and the liquid inlet of the fuel cell stack; A third valve is connected between the exhaust pipe and the outside world; A fourth valve is provided between the liquid discharge pipeline and the outside.

3. The fuel cell liquid supply system according to claim 1, characterized in that: The pipeline connecting the liquid supply source and the liquid supply pipeline is provided with a second one-way valve, a fifth valve, a pressure reducing valve, a flow regulating valve, a flow meter, the stack entry safety valve, the solenoid valve and a sixth valve which are connected in sequence; A third one-way valve is connected between the second outlet of the stack entry safety valve and a pipeline connected to the outside.

4. The fuel cell liquid supply system according to any one of claims 1 to 3, characterized in that: The fuel cell liquid supply system also includes a circulation loop, the inlet of the circulation loop is connected to the liquid outlet of the fuel cell stack, the outlet of the circulation loop is connected to the liquid inlet of the fuel cell stack, and the connection point is located downstream of the solenoid valve.

5. The fuel cell liquid supply system according to claim 4, characterized in that: The circulation loop is provided with a self-circulating safety valve and a heat dissipation device which are connected in sequence; The self-circulating safety valve is provided with an inlet connected to the liquid outlet of the battery stack, a third outlet connected to the heat dissipation device, and a fourth outlet connected to the outside.

6. The fuel cell liquid supply system according to any one of claims 1 to 3, characterized in that: The fuel cell liquid supply system is applied to a fuel cell comprising a plurality of fuel cell stacks, and the number of the liquid supply subsystems is the same as the number of the fuel cell stacks; The fuel cell liquid supply system further includes a self-compensating tube. The self-compensating tube in the liquid supply subsystem is communicated with the liquid supply pipeline and is connected in parallel to the inlet of the stack safety valve.

7. The fuel cell liquid supply system according to any one of claims 1 to 3, characterized in that: The pipe body of the pipeline of the fuel cell liquid supply system includes a soft pipe and a hard pipe.

8. The fuel cell liquid supply system according to any one of claims 1 to 3, characterized in that: The diameter of the purge pipeline is 1 / 10 to 1 / 8 of the diameter of the coolant pipeline; At the connection point between the purge pipeline and the liquid supply pipeline, the gas pressure of the purge pipeline is greater than the liquid pressure in the liquid supply pipeline.

9. A liquid supply method for a fuel cell liquid supply system according to any one of claims 1 to 8, characterized in that: The steps include: In response to the test simulation stack startup signal, the purge pipeline and the exhaust pipeline are closed, the liquid supply pipeline is opened, and the cooling liquid provided by the liquid supply source enters the stack through the first outlet of the safety valve and the solenoid valve, and the cooling system of the stack starts to work; In response to a test simulation stack shutdown signal, the liquid supply pipeline is closed, and the liquid discharge pipeline of the stack is opened, and the purge gas provided by the purge gas source enters the stack through the purge pipeline and the liquid supply pipeline, so as to purge the coolant inside the stack and discharge it through the liquid discharge pipeline; After the purge is completed, the purge pipeline and the drain pipeline are closed.

10. The liquid supply method of a fuel cell liquid supply system according to claim 9, characterized in that: In the case where the fuel cell liquid supply system includes a self-compensating tube, the liquid supply method includes the following steps: In response to the test simulation stack startup signal, the exhaust pipeline and the purge pipeline are closed, the liquid supply pipeline and the self-compensation tube are opened, and the cooling liquid provided by the liquid supply source enters the stack through the first outlet of the stack entry safety valve and the solenoid valve, and the cooling system of the stack starts to work; In response to a test simulation stack shutdown signal, the liquid supply pipeline is closed, and the liquid discharge pipeline of the stack is opened, and the purge gas provided by the purge gas source enters the stack through the purge pipeline and the liquid supply pipeline, so as to purge the coolant inside the stack and discharge it through the liquid discharge pipeline; After the purge is completed, the purge pipeline and the drain pipeline are closed.

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