Branch gas supply fuel cell and fuel cell control method

Abstract

The invention discloses a branch gas supply fuel cell and a fuel cell control method, and the branch gas supply fuel cell comprises an external gas inlet pipeline which is used for introducing fuel gas and oxygen; the electric pile is in pluggable connection with an external air inlet pipeline, and the electric pile is used for outputting electric energy after the fuel and the oxygen are subjected to a chemical reaction; the external gas outlet pipeline is in pluggable connection with the electric pile, and the external gas outlet pipeline is used for discharging waste gas generated after chemical reaction of the electric pile; the control circuit is connected with the electric pile, and the control circuit is used for adjusting the output voltage of the electric pile to a target voltage value when receiving the voltage control signal; the control circuit is further used for adjusting the output voltage of the electric pile to a preset voltage value when it is detected that the voltage of the electric pile is abnormal. According to the invention, the problem that circuit control and air passage control cannot be accurately carried out when the stack of the fuel cell is abnormal is solved.

Description

Technical Field

[0001] The invention relates to the field of fuel cells, and in particular to a fuel cell with branch gas supply and a fuel cell control method. Background Art

[0002] Solid Oxide Fuel Cells (SOFCs) are an efficient power generation device that directly converts the chemical energy of fuel into electrical energy, and have become an important research direction in the field of new energy technology. In order to meet the voltage and power requirements in actual use, SOFCs usually require multiple single cells to be connected in series to form a stack. However, the traditional series design has obvious defects, that is, when a single cell fails, the entire stack may not work properly, or when an abnormality occurs in a single cell, the circuit control and airway control cannot be accurately performed, which will affect the overall reliability and service life of the system. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a fuel cell with branch gas supply and a fuel cell control method to solve the problem that circuit control and airway control cannot be accurately performed when an abnormal situation occurs in the fuel cell stack.

[0004] The technical solution of the present invention is as follows:

[0005] The present invention provides a fuel cell with branch gas supply, comprising:

[0006] An external air intake pipeline, wherein the external air intake pipeline is used to introduce fuel gas and oxygen;

[0007] A fuel cell stack is pluggably connected to the external air intake pipe, and the fuel cell stack is used to output electrical energy after a chemical reaction between fuel and oxygen;

[0008] An external gas outlet pipe, the external gas outlet pipe is pluggably connected to the battery stack, and the external gas outlet pipe is used to discharge the waste gas generated after the battery stack undergoes a chemical reaction;

[0009] A control circuit is connected to the fuel cell stack, and the control circuit is used to adjust the output voltage of the fuel cell stack to a target voltage value when a voltage control signal is received; the control circuit is also used to adjust the output voltage of the fuel cell stack to a preset voltage value when a voltage abnormality of the fuel cell stack is detected.

[0010] Optionally, the battery stack includes:

[0011] A battery layer, wherein the battery layer comprises a plurality of connectors and a plurality of battery cells, wherein the plurality of connectors and the plurality of battery cells are connected in series alternately, and a battery cell and the connectors on both sides of the battery cell constitute a single battery;

[0012] End plates are arranged on both sides of the battery layer through screw connection;

[0013] The battery layer also includes a fuel inlet plug, an oxygen inlet plug, a fuel outlet plug and an oxygen outlet plug. The fuel inlet plug is provided with a battery fuel inlet, the oxygen inlet plug is provided with a battery oxygen inlet, the fuel outlet plug is provided with a battery fuel outlet, and the oxygen outlet plug is provided with a battery oxygen outlet. The fuel inlet plugs, fuel outlet plugs, oxygen inlet plugs and oxygen outlet plugs on adjacent single cells are staggered in the horizontal direction to form two columns of fuel inlet plugs, two columns of fuel outlet plugs, two columns of oxygen inlet plugs and two columns of oxygen outlet plugs.

[0014] Optionally, the external air intake duct comprises:

[0015] An air intake duct body, which is pluggably connected to the battery layer;

[0016] A fuel intake pipe connected to the intake pipe body, the fuel intake pipe is used to introduce fuel gas and output it to the battery layer through the intake pipe body;

[0017] an oxygen intake pipe connected to the intake pipe body, the oxygen intake pipe being used to introduce oxygen and output it to the battery layer through the intake pipe body;

[0018] The external air outlet duct comprises:

[0019] An air outlet duct body is pluggably connected to the battery layer;

[0020] A fuel outlet pipe is connected to the outlet pipe body, and the waste gas generated after the single cell performs a chemical reaction on the fuel is discharged through the outlet pipe body and the fuel outlet pipe in sequence;

[0021] The oxygen outlet pipe is connected to the outlet pipe body, and the waste gas generated after the single cell performs a chemical reaction on oxygen is discharged through the outlet pipe body and the oxygen outlet pipe in sequence.

[0022] Optionally, the fuel intake pipeline comprises:

[0023] A fuel intake main pipeline, used to introduce fuel gas;

[0024] A fuel intake branch pipe, one end of which is connected to the fuel intake main pipe, and the other end of which is connected to the intake pipe body;

[0025] The oxygen intake pipeline comprises:

[0026] An oxygen inlet main pipe is used to introduce oxygen;

[0027] An oxygen intake branch pipe, one end of which is connected to the oxygen intake main pipe, and the other end of which is connected to the intake pipe body.

[0028] Optionally, the air intake pipe body is provided with a fuel branch pipe interface, an oxygen branch pipe interface, a fuel intake interface, and an oxygen intake interface, the fuel branch pipe interface is used to connect the fuel intake branch pipe, the oxygen branch pipe interface is used to connect the oxygen intake branch pipe, the fuel intake interface is used to connect the fuel intake plug, and the oxygen intake interface is used to connect the oxygen intake plug; the air outlet pipe body is provided with a fuel outlet interface and an oxygen outlet interface, the fuel outlet interface is used to connect the fuel outlet plug, and the oxygen outlet interface is used to connect the oxygen outlet plug.

[0029] Optionally, the fuel cell with branch gas supply further comprises:

[0030] A plurality of flow valves are correspondingly arranged on the fuel intake main pipeline and the oxygen intake main pipeline, wherein the flow valve is used to open the passage of the fuel intake main pipeline or the oxygen intake main pipeline when opening, and the flow valve is also used to open the passage of the fuel intake main pipeline or the oxygen intake main pipeline when opening;

[0031] A plurality of solenoid valves are correspondingly arranged on the fuel intake branch pipe and the oxygen intake branch pipe, wherein the solenoid valve is used to open the passage of the fuel intake branch pipe or the oxygen intake branch pipe when being opened, and the solenoid valve is also used to open the passage of the fuel intake branch pipe or the oxygen intake branch pipe when being opened;

[0032] A plurality of preheating devices are correspondingly arranged on the fuel intake branch pipe and the oxygen intake branch pipe.

[0033] Optionally, the control circuit includes:

[0034] A plurality of voltmeters, used for one-to-one detection of the voltages of the plurality of single batteries, and outputting corresponding voltage detection signals;

[0035] A plurality of relays connected one-to-one with the plurality of single batteries;

[0036] Gas sensor, used for fuel gas concentration in the fuel cell, and outputs corresponding gas concentration detection signal;

[0037] buzzer;

[0038] Indicator lights;

[0039] A microcontroller, wherein the input end of the microcontroller is connected to the output ends of the plurality of voltmeters, the input end of the microcontroller is also connected to the output end of the gas sensor, the output end of the microcontroller is connected to the controlled end of the relay, and the output end of the microcontroller is also connected to the controlled end of the buzzer, the controlled end of the indicator light, the controlled ends of the plurality of flow valves, and the controlled ends of the plurality of solenoid valves;

[0040] The microcontroller is used to control the relay connected to the single cell with abnormal voltage to short-circuit the single cell with abnormal voltage, and control the solenoid valves on the fuel intake branch pipe and the oxygen intake branch pipe connected to the single cell with abnormal voltage to disconnect when it is determined that the voltage of any single cell is abnormal according to the voltage detection signals output by the multiple voltmeters; the microcontroller is also used to control the operation of multiple flow valves or multiple relays to adjust the output voltage of the battery stack to a target voltage value when receiving a voltage control signal; the microcontroller is also used to control the disconnection of multiple flow valves and the operation of the buzzer and the indicator light when it is determined that the fuel gas concentration in the fuel cell exceeds a preset concentration value according to the gas concentration detection signal output by the gas sensor.

[0041] The present invention also provides a fuel cell control method applied to the fuel cell with branch gas supply as described above, comprising the following steps:

[0042] Obtaining voltage control signals and voltage detection signals of the battery stack;

[0043] adjusting the output voltage of the battery stack to a target voltage value according to a voltage control signal;

[0044] When it is determined according to the voltage detection signal that the voltage of the battery stack is abnormal, the output voltage of the battery stack is adjusted to a preset voltage value.

[0045] Optionally, the step of adjusting the output voltage of the battery stack to a target voltage value according to the voltage control signal specifically includes:

[0046] Controlling the operation of a plurality of the flow valves or controlling the operation of a plurality of the relays;

[0047] The step of adjusting the output voltage of the battery stack to a preset voltage value when it is determined according to the voltage detection signal that the voltage of the battery stack is abnormal specifically includes:

[0048] When it is determined that the voltage of any single battery is abnormal according to the voltage detection signal, the relay connected to the single battery with abnormal voltage is controlled to short-circuit the single battery with abnormal voltage, and the solenoid valves on the fuel intake branch pipe and the oxygen intake branch pipe connected to the single battery with abnormal voltage are controlled to be disconnected.

[0049] Optionally, the fuel cell control method further comprises the following steps:

[0050] Obtaining gas concentration detection signals;

[0051] When it is determined according to the gas concentration detection signal that the fuel gas concentration in the fuel cell exceeds a preset concentration value, the plurality of flow valves are controlled to be disconnected.

[0052] The technical solution of the present invention is composed of an external air intake pipe, a stack, an external air outlet pipe and a control circuit, wherein the external air intake pipe can introduce fuel gas and oxygen; the stack is pluggable connected to the external air intake pipe, and the stack can output electrical energy after chemical reaction of the fuel and oxygen introduced by the external air intake pipe, thereby supplying power to electrical devices; the external air outlet pipe is also pluggable connected to the stack, and the external air outlet pipe can discharge the waste gas generated after the chemical reaction of the stack; the control circuit is connected to the stack, and the control circuit can adjust the output voltage of the stack to the target voltage value when receiving the voltage control signal output by the external device; the control circuit can also adjust the output voltage of the stack to a preset voltage value when the voltage of the stack is detected to be abnormal. In this way, the present solution can control the introduction and discharge of fuel gas and oxygen through the external air intake pipe and the external air outlet pipe, and control the output voltage of the stack through the control circuit, thereby solving the problem that the circuit control and airway control cannot be accurately performed when the stack of the fuel cell is abnormal. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0054] Figure 1 It is a structural schematic diagram of an embodiment of a fuel cell with branch gas supply according to the present invention.

[0055] Figure 2 It is a partial cross-sectional view of the structure of the main body of the external air intake pipeline in the fuel cell with branch air supply of the present invention.

[0056] Figure 3 It is a partial cutaway view of the main structure of the external gas outlet pipeline in the fuel cell with branch gas supply of the present invention.

[0057] Figure 4 It is a structural diagram of the air inlet side of the battery layer in the fuel cell with branch air supply of the present invention.

[0058] Figure 5 It is a structural diagram of the gas outlet side of the battery layer in the fuel cell with branch gas supply of the present invention.

[0059] Figure 6 It is a structural explosion diagram of the battery layer in the fuel cell with branch gas supply of the present invention.

[0060] Figure 7 It is a connection diagram of the control circuit in the fuel cell with branch gas supply of the present invention.

[0061] Figure 8 It is a schematic diagram of functional modules of an embodiment of a fuel cell with branch gas supply according to the present invention.

[0062] Fig. 9 It is a flow chart of the method steps of one embodiment of the fuel cell control method of the present invention.

[0063] Description of the accompanying drawings: 1. External air inlet pipe; 101. Fuel air inlet interface; 102. Oxygen air inlet interface; 103. Fuel branch pipe interface; 104. Oxygen branch pipe interface; 105. Air inlet pipe body; 2. External air outlet pipe; 201. Fuel air outlet interface; 202. Oxygen air outlet interface; 203. Air outlet pipe body; 3. Battery layer; 301. Fuel air inlet plug; 302. Oxygen air inlet plug; 303. Fuel air outlet plug; 304. Oxygen air outlet plug; 305. Battery fuel air inlet; 306. Battery oxygen air inlet; 3 07. Battery fuel outlet; 308. Battery oxygen outlet; 309. Connector; 310. Battery cell; 4. End plate; 5. Fuel air inlet main pipe; 6. Fuel air inlet branch pipe; 7. Oxygen air inlet main pipe; 8. Oxygen air inlet branch pipe; 9. Fuel air outlet pipe; 10. Oxygen air outlet pipe; 11. Flow valve; 12. Solenoid valve; 13. Preheating device; 14. Screw; 15. Nut; 16. Voltmeter; 17. Relay; 18. Flow meter; 19. Gas sensor; 20. Microcontroller; 21. Buzzer; 22. Indicator light. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0065] In the embodiments and the scope of the patent application, unless the text specifically defines the article, "a", "an", "the" and "the" may also include plural forms. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used 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 at least one of the features.

[0066] It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when an element is said to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can also be intermediate elements. In addition, the "connection" or "coupling" used herein can include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0067] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0068] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0069] Solid Oxide Fuel Cells (SOFCs) are an efficient power generation device that directly converts the chemical energy of fuel into electrical energy, and have become an important research direction in the field of new energy technology. In order to meet the voltage and power requirements in actual use, SOFCs usually require multiple single cells to be connected in series to form a stack. However, the traditional series design has obvious defects, that is, when a single cell fails, the entire stack may not work properly, or when an abnormality occurs in a single cell, the circuit control and airway control cannot be accurately performed, which will affect the overall reliability and service life of the system.

[0070] In order to solve the above problems, the present invention provides a fuel cell with branch gas supply.

[0071] Reference Figures 1 to 8 In one embodiment, a fuel cell with branch gas supply includes:

[0072] An external air intake pipeline 1, wherein the external air intake pipeline 1 is used to introduce fuel gas and oxygen;

[0073] A fuel cell stack is pluggably connected to the external air intake pipe 1, and the fuel cell stack is used to output electrical energy after a chemical reaction between fuel and oxygen;

[0074] An external gas outlet pipe 2, the external gas outlet pipe 2 is pluggably connected to the battery stack, and the external gas outlet pipe 2 is used to discharge the waste gas generated after the battery stack undergoes a chemical reaction;

[0075] A control circuit is connected to the fuel cell stack, and the control circuit is used to adjust the output voltage of the fuel cell stack to a target voltage value when a voltage control signal is received; the control circuit is also used to adjust the output voltage of the fuel cell stack to a preset voltage value when a voltage abnormality of the fuel cell stack is detected.

[0076] In this embodiment, the battery stack can be composed of multiple single cells. A single cell refers to a single battery unit, which can be composed of an anode, a cathode and an electrolyte. The working principle of a single cell is based on redox reaction. The fuel (such as hydrogen) is oxidized at the anode to produce electrons and hydrogen ions. The hydrogen ions migrate to the cathode through the electrolyte and react with the oxidant (such as oxygen) at the cathode to generate water and electrons. The electrons flow from the anode to the cathode through the external circuit to form a current to power the external electrical device. The external air inlet pipe 1 can be used to introduce the reaction gas required for the fuel cell. In this embodiment, fuel gas and oxygen are introduced. The specific reaction gas can be set according to the actual situation; the external air outlet pipe 2 is used to discharge the waste gas generated after the chemical reaction of multiple single cells in the battery stack, or to discharge the excess unreacted gas, which can help maintain the appropriate pressure inside the fuel cell and avoid excessive or low pressure from affecting the performance of the fuel cell. In some cases, the design of the external air outlet pipe 2 can also take away the heat generated during the reaction, thereby playing a cooling role.

[0077] The control circuit can be composed of a controller and a voltage detection device. The voltage detection device can be used to detect the voltage values ​​of multiple cells in the stack and output corresponding electrical signals to the controller. When the controller detects that the voltage of any cell in the stack is abnormal according to the electrical signal output by the voltage detection device, it determines that the voltage of the stack is abnormal. At this time, the controller can adjust the output voltage of the stack to a preset voltage value; for example, the memory in the controller stores a preset voltage value, which is the target output voltage value of the fuel cell. When the output voltage of the stack is lower than the target output voltage value of the fuel cell, the controller needs to adjust the output voltage of the stack to the preset voltage value, which can be specifically to increase the overall flow rate of the reaction gas entering the fuel cell and increase the output voltage value of the fuel cell. In another case, in order to ensure the life of the cells in the stack, when the voltage value of a cell is detected to be abnormal, the cell is short-circuited so as not to affect the normal operation of the other cells in the stack; and the cell is no longer reacted with gas; the overall flow rate of the reaction gas can also be reduced so that the reaction gas entering the other cells remains basically unchanged, the output electrical parameters of the cells are maintained basically unchanged, and fuel can also be saved.

[0078] Furthermore, the control circuit can also be connected to an external device, receive a voltage control signal output by the external device, and adjust the output voltage of the fuel cell to a target voltage value. For example, the current output voltage of the fuel cell is 5V, and the output voltage of the fuel cell needs to be adjusted to 10V according to the voltage signal output by the external device. At this time, the control circuit can increase the overall flow rate of the reaction gas entering the fuel cell, thereby increasing the output voltage value of the fuel cell.

[0079] The technical solution of the present invention is composed of an external air intake pipe 1, a stack, an external air outlet pipe 2 and a control circuit, wherein the external air intake pipe 1 can introduce fuel gas and oxygen; the stack is pluggable connected to the external air intake pipe 1, and the stack can output electrical energy after chemical reaction of the fuel and oxygen introduced by the external air intake pipe 1, thereby supplying power to electrical devices; the external air outlet pipe 2 is also pluggable connected to the stack, and the external air outlet pipe 2 can discharge the waste gas generated after the chemical reaction of the stack; the control circuit is connected to the stack, and the control circuit can adjust the output voltage of the stack to the target voltage value when receiving the voltage control signal output by the external device; the control circuit can also adjust the output voltage of the stack to a preset voltage value when the voltage of the stack is detected to be abnormal. In this way, the present solution can control the introduction and discharge of fuel gas and oxygen through the external air intake pipe 1 and the external air outlet pipe 2, and control the output voltage of the stack through the control circuit, thereby solving the problem that the circuit control and airway control cannot be accurately performed when the stack of the fuel cell is abnormal.

[0080] Reference Figures 1 to 8 In one embodiment, the battery stack includes:

[0081] A battery layer 3, wherein the battery layer 3 comprises a plurality of connectors 309 and a plurality of battery cells 310, wherein the plurality of connectors 309 and the plurality of battery cells 310 are connected in series alternately, and one battery cell 310 and the connectors 309 on both sides of the battery cell 310 constitute a single battery;

[0082] End plates 4 are connected to both sides of the battery layer 3 through screws 14;

[0083] The battery layer 3 also includes a fuel inlet plug 301, an oxygen inlet plug 302, a fuel outlet plug 303 and an oxygen outlet plug 304. The fuel inlet plug 301 is provided with a battery fuel inlet port 305, the oxygen inlet plug 302 is provided with a battery oxygen inlet port 306, the fuel outlet plug 303 is provided with a battery fuel outlet port 307, and the oxygen outlet plug 304 is provided with a battery oxygen outlet port 308. The fuel inlet plugs 301, fuel outlet plugs 303, oxygen inlet plugs 302 and oxygen outlet plugs 304 on adjacent single cells are staggered in the horizontal direction to form two columns of fuel inlet plugs 301, two columns of fuel outlet plugs 303, two columns of oxygen inlet plugs 302 and two columns of oxygen outlet plugs 304.

[0084] In this embodiment, the battery stack is composed of a battery layer 3 and an end plate 4, wherein the battery layer 3 can be composed of a connector 309 and a battery cell 310 alternately connected in series, and a battery cell 310 and the connectors 309 on both sides of the battery cell 310 can constitute a single battery; the end plates 4 are installed on both sides of the battery layer 3, and the end plates 4 on both sides are connected by screws 14 to tighten the battery layer 3, and then the screws 14 are fixed by nuts 15; the fastened battery layer 3 is connected to the external air inlet pipe 1 and the external air outlet pipe 2 by plugging and unplugging; the battery layer 3 can be connected to the corresponding sockets on the external air duct by setting a plurality of fuel inlet plugs 301, fuel outlet plugs 303, oxygen inlet plugs 302 and oxygen outlet plugs 304, thereby forming a pluggable connection, and the specific number of plugs and plug sizes can be designed according to actual conditions. The battery fuel inlet 305 provided on the fuel inlet plug 301, the battery fuel outlet 307 provided on the fuel outlet plug 303, the battery oxygen inlet 306 provided on the oxygen inlet plug 302, and the battery oxygen outlet 308 provided on the oxygen outlet plug 304 are used to introduce fuel and oxygen, and discharge fuel and oxygen to the external airway, respectively. Through the above structure, the reaction gas can be introduced from the side, and each single cell can be supplied with gas independently. Multiple inlets and outlets can also be designed to correspond to multiple single cells, and it can also avoid the situation where one inlet or outlet is blocked, resulting in the inability to introduce or discharge gas. For example, one single cell corresponds to one inlet and outlet, and one single cell can also correspond to multiple inlets and outlets. The number of inlets corresponding to the specific single cell can be set according to actual conditions and user needs. Furthermore, the fuel inlet plug 301, oxygen inlet plug 302, fuel outlet plug 303, and oxygen outlet plug 304 on the single cell in the battery layer 3 can be located at the same height; the fuel inlet plug 301, fuel outlet plug 303, oxygen inlet plug 302, and oxygen outlet plug 304 of adjacent single cells can be staggered in the horizontal direction to form two columns of fuel inlet plugs 301, two columns of fuel outlet plugs 303, two columns of oxygen inlet plugs 302, and two columns of oxygen outlet plugs 304, so that the battery layer 3 can still maintain a compact stacking layout to reduce space occupancy while achieving local air supply control of the single cell.

[0085] Reference Figures 1 to 8 In one embodiment, the external air intake duct 1 comprises:

[0086] The air intake duct body 105 is pluggably connected to the battery layer 3;

[0087] A fuel air intake pipeline connected to the air intake pipeline body 105, the fuel air intake pipeline is used to introduce fuel gas and output it to the battery layer 3 through the air intake pipeline body 105;

[0088] An oxygen intake pipe connected to the intake pipe body 105, the oxygen intake pipe is used to introduce oxygen and output it to the battery layer 3 through the intake pipe body 105;

[0089] The external air outlet pipe 2 comprises:

[0090] The air outlet duct body 203 is pluggably connected to the battery layer 3;

[0091] The fuel outlet pipe 9 is connected to the outlet pipe body 203, and the waste gas generated after the single cell performs a chemical reaction on the fuel is discharged through the outlet pipe body 203 and the fuel outlet pipe 9 in sequence;

[0092] The oxygen outlet pipe 10 is connected to the outlet pipe body 203 , and the waste gas generated after the single cell performs a chemical reaction on oxygen is discharged through the outlet pipe body 203 and the oxygen outlet pipe 10 in sequence.

[0093] In this embodiment, the external air inlet pipe 1 can be composed of an air inlet pipe body 105, a fuel air inlet pipe and an oxygen air inlet pipe, and the external air outlet pipe 2 can be composed of an air outlet pipe body 203, a fuel air outlet pipe 9 and an oxygen air outlet pipe 10. By setting the above-mentioned multiple pipes, the fuel gas can be output to the multiple single cells in the battery layer 3 through the fuel air inlet pipe and the air inlet pipe body 105; and the exhaust gas generated by the chemical reaction of the single cell with the fuel can be discharged through the air outlet pipe body 203 and the fuel air outlet pipe 9 in sequence; oxygen can also be output to the single cell through the oxygen air inlet pipe and the air inlet pipe body 105, and the exhaust gas generated by the chemical reaction of the single cell with oxygen can be discharged through the air outlet pipe body 203 and the oxygen air outlet pipe 10 in sequence, so that the reaction gas and the exhaust gas will not be mixed.

[0094] Reference Figures 1 to 8 In one embodiment, the fuel intake pipe comprises:

[0095] A fuel intake main pipeline 5, used for introducing fuel gas;

[0096] A fuel intake branch pipe 6, one end of which is connected to the fuel intake main pipe 5, and the other end of which is connected to the intake pipe body 105;

[0097] The oxygen intake pipeline comprises:

[0098] An oxygen inlet main pipe 7, used for introducing oxygen;

[0099] An oxygen intake branch pipe 8 , one end of which is connected to the oxygen intake main pipe 7 , and the other end of which is connected to the intake pipe main body 105 .

[0100] In this embodiment, the fuel intake pipeline can be composed of a fuel intake main pipeline 5 and a fuel intake branch pipeline 6, and the oxygen intake pipeline can be composed of an oxygen intake main pipeline 7 and an oxygen intake branch pipeline 8. The fuel intake pipeline is divided into multiple pipelines, and solenoid valves 12 can be designed on different pipelines to control the conduction or disconnection of the pipelines, thereby improving the control ability of the entire pipeline. Furthermore, the fuel intake main pipeline 5 and the oxygen intake main pipeline 7 can be arranged on both sides of the airway body, respectively, to reduce the probability of oxygen and fuel cross-talk.

[0101] Reference Figures 1 to 8 In one embodiment, the air intake pipe body 105 is provided with a fuel branch pipe interface 103, an oxygen branch pipe interface 104, a fuel intake interface 101, and an oxygen intake interface 102, the fuel branch pipe interface 103 is used to connect the fuel intake branch pipe 6, the oxygen branch pipe interface 104 is used to connect the oxygen intake branch pipe 8, the fuel intake interface 101 is used to connect the fuel intake plug 301, and the oxygen intake interface 102 is used to connect the oxygen intake plug 302; the air outlet pipe body 203 is provided with a fuel outlet interface 201 and an oxygen outlet interface 202, the fuel outlet interface 201 is used to connect the fuel outlet plug 303, and the oxygen outlet interface 202 is used to connect the oxygen outlet plug 304.

[0102] In this embodiment, the single battery and multiple interfaces on the airway body are connected by plugging and unplugging; and the fuel inlet interface 101, oxygen inlet interface 102, fuel branch pipe interface 103, and oxygen branch pipe interface 104 on the external air inlet pipe 1 can also adopt an arrangement corresponding to the fuel inlet plug 301 and oxygen inlet plug 302 in the above-mentioned embodiment; the fuel outlet interface 201 and oxygen outlet interface 202 on the external air outlet pipe 2 can adopt an arrangement corresponding to the fuel outlet plug 303 and oxygen outlet plug 304 in the above-mentioned embodiment.

[0103] Reference Figures 1 to 8 In one embodiment, the fuel cell with branch gas supply further comprises:

[0104] A plurality of flow valves 11 are correspondingly arranged on the fuel intake main pipeline 5 and the oxygen intake main pipeline 7. The flow valves 11 are used to open the passage of the fuel intake main pipeline 5 or the oxygen intake main pipeline 7 when opening, and the flow valves 11 are also used to open the passage of the fuel intake main pipeline 5 or the oxygen intake main pipeline 7 when opening;

[0105] A plurality of solenoid valves 12 are correspondingly arranged on the fuel intake branch pipe 6 and the oxygen intake branch pipe 8. The solenoid valves 12 are used to open the passage of the fuel intake branch pipe 6 or the oxygen intake branch pipe 8 when being opened, and the solenoid valves 12 are also used to open the passage of the fuel intake branch pipe 6 or the oxygen intake branch pipe 8 when being opened;

[0106] A plurality of preheating devices 13 are correspondingly arranged on the fuel intake branch pipe 6 and the oxygen intake branch pipe 8 .

[0107] In this embodiment, flow valves 11 are provided on the fuel intake main pipeline 5 and the oxygen intake main pipeline 7 to control the flow of the entire pipeline; and solenoid valves 12 are provided on the fuel intake branch pipeline 6 and the oxygen intake branch pipeline 8 to control the reaction gases entering the multiple cells in the stack. In addition, the preheating device 13 provided on the fuel intake branch pipeline 6 and the oxygen intake branch pipeline 8 can preheat the fuel and oxygen to facilitate the chemical reaction of the fuel and oxygen in the cell. The preheating device 13 can be a heating device with a heating function such as an air preheater. Furthermore, the solenoid valve 12 can be provided before the preheating device 13 to avoid the higher technical requirements of the hot gas on the solenoid valve 12 and reduce the difficulty of operating the solenoid valve 12.

[0108] Reference Figures 1 to 8 In one embodiment, the control circuit comprises:

[0109] A plurality of voltmeters 16, used for one-to-one detection of the voltages of the plurality of single cells, and outputting corresponding voltage detection signals;

[0110] A plurality of relays 17, connected one-to-one with the plurality of single batteries;

[0111] The gas sensor 19 is used to detect the fuel gas concentration in the fuel cell and output a corresponding gas concentration detection signal;

[0112] Buzzer 21;

[0113] Indicator light 22;

[0114] A microcontroller 20, wherein the input end of the microcontroller 20 is connected to the output ends of the plurality of voltmeters 16, the input end of the microcontroller 20 is also connected to the output end of the gas sensor 19, the output end of the microcontroller 20 is connected to the controlled end of the relay 17, and the output end of the microcontroller 20 is also connected to the controlled end of the buzzer 21, the controlled end of the indicator light 22, the controlled ends of the plurality of flow valves 11, and the controlled ends of the plurality of solenoid valves 12;

[0115] The microcontroller 20 is used to control the relay 17 connected to the single cell with abnormal voltage to short-circuit the single cell with abnormal voltage, and control the solenoid valve 12 on the fuel intake branch pipe 6 and the oxygen intake branch pipe 8 connected to the single cell with abnormal voltage to disconnect when the voltage of any single cell is determined to be abnormal according to the voltage detection signal output by the multiple voltmeters 16; the microcontroller 20 is also used to control the operation of the multiple flow valves 11 or the multiple relays 17 when receiving a voltage control signal, so as to adjust the output voltage of the fuel cell stack to a target voltage value; the microcontroller 20 is also used to control the disconnection of the multiple flow valves 11 and control the operation of the buzzer 21 and the indicator light 22 when it is determined that the fuel gas concentration in the fuel cell exceeds a preset concentration value according to the gas concentration detection signal output by the gas sensor 19.

[0116] In this embodiment, the control circuit can be composed of multiple voltmeters 16, multiple relays 17, gas sensors 19, buzzers 21, indicator lights 22 and microcontrollers 20. The voltmeter 16 can detect the voltage of a single cell, or other voltage detection devices can be used to detect the voltage of a single cell; the relay 17 can be used to control the short circuit of a single cell. The microcontroller 20 can be a digital signal processor (DSP), a programmable logic device (PLD), a microprocessor, an MCU or other electronic components; the gas sensor 19 is a sensor that can detect and measure changes in gas concentration. In this way, when the microcontroller 20 detects that the voltage of any single cell is abnormal, it can control the relay 17 to short-circuit the single cell with abnormal voltage, and control the solenoid valve 12 on the fuel intake branch pipe 6 and the oxygen intake branch pipe 8 connected to the single cell with abnormal voltage to disconnect, so that no reactive gas enters the single cell. The microcontroller 20 can also receive a voltage control signal output by an external device, and control the operation of multiple flow valves 11 or control the operation of multiple relays 17 according to the voltage control signal to adjust the output voltage of the battery stack to a target voltage value. By controlling the flow valve 11 through the microcontroller 20, the flow of the reaction gas entering the single cell can be controlled to adjust the output voltage and power; and by closing the relay 17 through the microcontroller 20 and closing the solenoid valve 12 corresponding to the closed relay 17 to control the number of single cells actually connected in the load circuit, the output voltage and power can also be adjusted; when it is necessary to actively adjust the output voltage or power of the battery stack, the output electrical parameters of the battery stack can be adjusted according to the active control method to meet the voltage and power requirements of the external electrical appliances; the external device can be a Bluetooth or computer device, etc. It should be noted that in this embodiment, the control sequence for the flow valve 11 control and the relay 17 control is to control the flow valve 11 first, and when the output voltage and power need to be further adjusted, the relay 17 is controlled to control the number of single cells. In addition, the microcontroller 20 can also determine the fuel gas concentration in the environment based on the gas concentration detection signal output by the gas sensor 19. When the fuel gas concentration exceeds the safe range, the airway can be cut off in time and an alarm can be sounded through the buzzer 21, and the indicator light 22 can be controlled to work to serve as a prompt. The alarm sound of the buzzer 21 and the color and flashing frequency of the indicator light 22 can be set according to actual conditions and user needs.

[0117] Through the branch gas supply fuel cell structure and circuit described in the above embodiments, local control of the circuit and airway of any single cell in the stack can be achieved without increasing the space occupied too much; the voltage of the single cell is monitored, and the circuit and airway of the abnormal single cell are adjusted in time, so as to protect the stack, that is, when a small number of single cells of the stack are damaged, its external output voltage and power are not greatly affected; by controlling the reaction gas flow supply of the single cell and the actual number of single cells connected in the circuit, the output electrical parameters of the stack can be adjusted to meet the different power requirements of external electrical appliances; the fuel gas concentration in the environment is monitored by the gas sensitive sensor 19, and when the fuel gas concentration exceeds the safe range, the airway is cut off in time and an alarm is sounded through the buzzer 21; the branch gas supply fuel cell of the present invention enhances the safety and reliability of the stack, and enhances the robustness of the stack under adverse working conditions; at the same time, the stack structure of the present invention is compactly arranged, and still has the advantage of saving space when controlling the branch gas supply of the single cell.

[0118] The present invention also provides a fuel cell control method applied to the fuel cell with branch gas supply as described above.

[0119] Reference Fig. 9 In one embodiment, the fuel cell control method comprises the following steps:

[0120] S100, obtaining a voltage control signal and a voltage detection signal of a battery stack;

[0121] S200, adjusting the output voltage of the battery stack to a target voltage value according to a voltage control signal;

[0122] S300, when it is determined according to a voltage detection signal that the voltage of the battery stack is abnormal, adjusting the output voltage of the battery stack to a preset voltage value.

[0123] In this embodiment, the voltage control signal output by the external device and the voltage detection signal of the stack can be obtained, and the voltage detection signal can be output by the voltage detection device. According to the voltage control signal output by the external device, the output voltage of the fuel cell can be adjusted to the target voltage value. For example, the output voltage of the fuel cell is currently 5V. According to the voltage signal output by the external device, the output voltage of the fuel cell needs to be adjusted to 10V. At this time, the overall flow rate of the reaction gas entering the fuel cell can be increased, thereby increasing the output voltage value of the fuel cell. When it is determined according to the voltage detection signal that the voltage of any single cell in the stack is abnormal, it can be determined that the voltage of the stack is abnormal. At this time, the output voltage of the stack can be adjusted to a preset voltage value; for example, a preset voltage value is stored in the memory, which is the target output voltage value of the fuel cell. When the output voltage of the stack is lower than the target output voltage value of the fuel cell, the output voltage of the stack needs to be adjusted to the preset voltage value. Specifically, the overall flow rate of the reaction gas entering the fuel cell can be increased to increase the output voltage value of the fuel cell. In another case, in order to ensure the normal operation of the battery stack as a whole, when an abnormal voltage value of a single cell is detected, the single cell is short-circuited so as not to affect the operation of other normal single cells in the battery stack; and no reaction gas will enter the single cell; the overall flow rate of the reaction gas can also be reduced so that the reaction gas entering the remaining single cells remains basically unchanged, maintaining the output electrical parameters of the single cell basically unchanged, and also saving fuel.

[0124] In one embodiment, the step of adjusting the output voltage of the stack to a target voltage value according to the voltage control signal specifically includes:

[0125] Controlling the operation of the plurality of flow valves 11 or the plurality of relays 17;

[0126] The step of adjusting the output voltage of the battery stack to a preset voltage value when it is determined according to the voltage detection signal that the voltage of the battery stack is abnormal specifically includes:

[0127] When it is determined that the voltage of any single cell is abnormal according to the voltage detection signal, the relay 17 connected to the single cell with abnormal voltage is controlled to short-circuit the single cell with abnormal voltage, and the solenoid valve 12 on the fuel intake branch pipe 6 and the oxygen intake branch pipe 8 connected to the single cell with abnormal voltage is controlled to be disconnected.

[0128] In this embodiment, the control flow valve 11 can control the flow of the reaction gas into the single cell, and adjust the output voltage and power; and the microcontroller 20 closes the relay 17 and closes the electromagnetic valve 12 corresponding to the closed relay 17 to control the number of single cells actually connected in the load circuit, and the output voltage and power can also be adjusted; when the output voltage or power of the battery stack needs to be actively adjusted, the output electrical parameters of the battery stack can be adjusted according to the active control method to meet the voltage and power requirements of the external electrical appliances; in this embodiment, the control sequence of the flow valve 11 control and the relay 17 control is to control the flow valve 11 first, and when the output voltage and power need to be further adjusted, the relay 17 is controlled to control the number of single cells. In addition, when the voltage of any single cell is detected to be abnormal, the relay 17 can be controlled to short-circuit the single cell with abnormal voltage, and then the electromagnetic valve 12 on the fuel intake branch pipe 6 and the oxygen intake branch pipe 8 connected to the single cell with abnormal voltage is disconnected, so that the single cell no longer has reaction gas entering, thereby protecting the battery stack.

[0129] In one embodiment, the fuel cell control method further comprises the following steps:

[0130] Obtaining gas concentration detection signals;

[0131] When it is determined according to the gas concentration detection signal that the fuel gas concentration in the fuel cell exceeds a preset concentration value, the plurality of flow valves 11 are controlled to be disconnected.

[0132] In this embodiment, the fuel gas concentration in the environment can be determined based on the gas concentration detection signal output by the gas sensor 19. When the fuel gas concentration exceeds the safe range, multiple flow valves 11 can be controlled to disconnect, thereby cutting off the airway; at the same time, an alarm can be sounded through the buzzer 21, and the indicator light 22 can be controlled to work to serve as a prompt. The alarm sound of the buzzer 21 and the color and flashing frequency of the indicator light 22 can be set according to actual conditions and user needs.

[0133] In order to better illustrate the technical concept of the present invention, the following Figures 1 to 9 The working principle of the present invention is described:

[0134] When the fuel cell with branch gas supply is working, the control circuit works, the flow valve 11 and the solenoid valve 12 are in the connected state, the relay 17 is in the disconnected state, and then the preheating device 13 is turned on; the fuel and oxygen are used as the reaction gas; the microcontroller 20 controls the overall flow of the reaction gas according to the number of relays 17 that are turned on; the fuel is introduced from the fuel intake main pipeline 5, passes through the flow meter 18 and the flow valve 11 in sequence, and then enters the fuel intake branch pipeline 6. After the fuel passes through the solenoid valve 12 on the fuel intake branch pipeline 6, it enters the preheating device 13 for preheating, and then enters the single cell through the gas channel body. After the reaction inside the single cell, the remaining gas and exhaust gas pass through the gas channel body. , and discharged through the fuel outlet pipe 9; oxygen is introduced from the oxygen intake main pipe 7, passes through the flow meter 18 and the flow valve 11 in sequence, and then enters the oxygen intake branch pipe 8. The fuel passes through the solenoid valve 12 on the oxygen intake branch pipe 8 and enters the preheating device 13 for preheating, and then enters the single cell through the airway body. After the reaction inside the single cell, the remaining gas and exhaust gas pass through the airway body and are discharged through the oxygen outlet pipe; the fuel cell converts the chemical energy of the reaction gas into electrical energy, thereby supplying power to external electrical appliances; wherein the flow meter 18 can be set on the fuel intake main pipe 5 and the oxygen intake main pipe 7 to measure the flow rate of the fluid (liquid or gas).

[0135] The microcontroller 20 can obtain the signals of the voltmeter 16 and the gas sensor 19 in real time; when the reading of the voltmeter 16 is detected to be abnormal, the relay 17 of the single cell corresponding to the voltmeter 16 is closed, so that the single cell is short-circuited, thereby not affecting the operation of the remaining single cells in the fuel cell stack; at the same time, the solenoid valve 12 of the single cell corresponding to the voltmeter 16 is closed, so that no fuel enters the single cell; under the control of the microcontroller 20, the flow valve 11 reduces the overall flow of the reaction gas according to the number of closed relays 17 so that the reaction gas entering the remaining single cells remains basically unchanged, and the output electrical parameters of the single cell are maintained basically unchanged; when the microcontroller 20 detects that the concentration of fuel gas in the fuel cell exceeds the preset concentration value according to the signal output by the gas sensor 19, the flow valve 11 is immediately closed, and the buzzer 21 and the indicator light 22 are controlled to sound an alarm.

[0136] In addition, when the output voltage or power of the battery stack needs to be actively adjusted, the number of single cells actually connected in the load circuit can be controlled by relay 17, and the flow rate of the reaction gas can be controlled by flow valve 11 to adjust the output voltage and power to meet the voltage and power requirements of external electrical appliances.

[0137] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A fuel cell with branch gas supply, characterized in that: include: An external air intake pipeline, wherein the external air intake pipeline is used to introduce fuel gas and oxygen; A fuel cell stack is pluggably connected to the external air intake pipe, and the fuel cell stack is used to output electrical energy after a chemical reaction between fuel and oxygen; An external gas outlet pipe, the external gas outlet pipe is pluggably connected to the battery stack, and the external gas outlet pipe is used to discharge the waste gas generated after the battery stack undergoes a chemical reaction; A control circuit connected to the battery stack, wherein the control circuit is used to adjust the output voltage of the battery stack to a target voltage value when receiving a voltage control signal; The control circuit is also used to adjust the output voltage of the battery stack to a preset voltage value when an abnormal voltage of the battery stack is detected.

2. The fuel cell with branch gas supply as claimed in claim 1, characterized in that: The battery stack comprises: A battery layer, wherein the battery layer comprises a plurality of connectors and a plurality of battery cells, wherein the plurality of connectors and the plurality of battery cells are connected in series alternately, and a battery cell and the connectors on both sides of the battery cell constitute a single battery; End plates are arranged on both sides of the battery layer through screw connection; The battery layer also includes a fuel inlet plug, an oxygen inlet plug, a fuel outlet plug and an oxygen outlet plug. The fuel inlet plug is provided with a battery fuel inlet, the oxygen inlet plug is provided with a battery oxygen inlet, the fuel outlet plug is provided with a battery fuel outlet, and the oxygen outlet plug is provided with a battery oxygen outlet. The fuel inlet plugs, fuel outlet plugs, oxygen inlet plugs and oxygen outlet plugs on adjacent single cells are staggered in the horizontal direction to form two columns of fuel inlet plugs, two columns of fuel outlet plugs, two columns of oxygen inlet plugs and two columns of oxygen outlet plugs.

3. The fuel cell with branch gas supply as claimed in claim 2, characterized in that: The external air intake duct comprises: An air intake duct body, which is pluggably connected to the battery layer; A fuel intake pipe connected to the intake pipe body, the fuel intake pipe is used to introduce fuel gas and output it to the battery layer through the intake pipe body; an oxygen intake pipe connected to the intake pipe body, the oxygen intake pipe being used to introduce oxygen and output it to the battery layer through the intake pipe body; The external air outlet duct comprises: An air outlet duct body is pluggably connected to the battery layer; A fuel outlet pipe is connected to the outlet pipe body, and the waste gas generated after the single cell performs a chemical reaction on the fuel is discharged through the outlet pipe body and the fuel outlet pipe in sequence; The oxygen outlet pipe is connected to the outlet pipe body, and the waste gas generated after the single cell performs a chemical reaction on oxygen is discharged through the outlet pipe body and the oxygen outlet pipe in sequence.

4. The fuel cell with branch gas supply as claimed in claim 3, characterized in that: The fuel intake pipeline comprises: A fuel intake main pipeline, used to introduce fuel gas; A fuel intake branch pipe, one end of which is connected to the fuel intake main pipe, and the other end of which is connected to the intake pipe body; The oxygen intake pipeline comprises: An oxygen inlet main pipe is used to introduce oxygen; An oxygen intake branch pipe, one end of which is connected to the oxygen intake main pipe, and the other end of which is connected to the intake pipe body.

5. The fuel cell with branch gas supply as claimed in claim 4, characterized in that: The air intake pipe body is provided with a fuel branch pipe interface, an oxygen branch pipe interface, a fuel intake interface, and an oxygen intake interface. The fuel branch pipe interface is used to connect the fuel intake branch pipe, the oxygen branch pipe interface is used to connect the oxygen intake branch pipe, the fuel intake interface is used to connect the fuel intake plug, and the oxygen intake interface is used to connect the oxygen intake plug; the air outlet pipe body is provided with a fuel outlet interface and an oxygen outlet interface. The fuel outlet interface is used to connect the fuel outlet plug, and the oxygen outlet interface is used to connect the oxygen outlet plug.

6. The fuel cell with branch gas supply as claimed in claim 4, characterized in that: The fuel cell with branch gas supply also includes: A plurality of flow valves are correspondingly arranged on the fuel intake main pipeline and the oxygen intake main pipeline, wherein the flow valve is used to open the passage of the fuel intake main pipeline or the oxygen intake main pipeline when opening, and the flow valve is also used to open the passage of the fuel intake main pipeline or the oxygen intake main pipeline when opening; A plurality of solenoid valves are correspondingly arranged on the fuel intake branch pipe and the oxygen intake branch pipe, wherein the solenoid valve is used to open the passage of the fuel intake branch pipe or the oxygen intake branch pipe when being opened, and the solenoid valve is also used to open the passage of the fuel intake branch pipe or the oxygen intake branch pipe when being opened; A plurality of preheating devices are correspondingly arranged on the fuel intake branch pipe and the oxygen intake branch pipe.

7. The fuel cell with branch gas supply as claimed in claim 6, characterized in that: The control circuit comprises: A plurality of voltmeters, used for one-to-one detection of the voltages of the plurality of single batteries, and outputting corresponding voltage detection signals; A plurality of relays connected one-to-one with the plurality of single batteries; Gas sensor, used for fuel gas concentration in the fuel cell, and outputs corresponding gas concentration detection signal; buzzer; Indicator lights; A microcontroller, wherein the input end of the microcontroller is connected to the output ends of the plurality of voltmeters, the input end of the microcontroller is also connected to the output end of the gas sensor, the output end of the microcontroller is connected to the controlled end of the relay, and the output end of the microcontroller is also connected to the controlled end of the buzzer, the controlled end of the indicator light, the controlled ends of the plurality of flow valves, and the controlled ends of the plurality of solenoid valves; The microcontroller is used to control the relay connected to the single cell with abnormal voltage to short-circuit the single cell with abnormal voltage, and control the solenoid valves on the fuel intake branch pipe and the oxygen intake branch pipe connected to the single cell with abnormal voltage to disconnect when it is determined that the voltage of any single cell is abnormal according to the voltage detection signals output by the multiple voltmeters; the microcontroller is also used to control the operation of multiple flow valves or multiple relays to adjust the output voltage of the battery stack to a target voltage value when receiving a voltage control signal; the microcontroller is also used to control the disconnection of multiple flow valves and the operation of the buzzer and the indicator light when it is determined that the fuel gas concentration in the fuel cell exceeds a preset concentration value according to the gas concentration detection signal output by the gas sensor.

8. A fuel cell control method applied to a fuel cell with branch gas supply as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Obtaining voltage control signals and voltage detection signals of the battery stack; adjusting the output voltage of the battery stack to a target voltage value according to a voltage control signal; When it is determined according to the voltage detection signal that the voltage of the battery stack is abnormal, the output voltage of the battery stack is adjusted to a preset voltage value.

9. The fuel cell control method according to claim 8, characterized in that: The step of adjusting the output voltage of the stack to a target voltage value according to the voltage control signal specifically includes: Controlling the operation of a plurality of the flow valves or controlling the operation of a plurality of the relays; The step of adjusting the output voltage of the battery stack to a preset voltage value when it is determined according to the voltage detection signal that the voltage of the battery stack is abnormal specifically includes: When it is determined that the voltage of any single battery is abnormal according to the voltage detection signal, the relay connected to the single battery with abnormal voltage is controlled to short-circuit the single battery with abnormal voltage, and the solenoid valves on the fuel intake branch pipe and the oxygen intake branch pipe connected to the single battery with abnormal voltage are controlled to be disconnected.

10. The fuel cell control method according to claim 8, characterized in that: The following steps are also included: Obtaining gas concentration detection signals; When it is determined according to the gas concentration detection signal that the fuel gas concentration in the fuel cell exceeds a preset concentration value, the plurality of flow valves are controlled to be disconnected.

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