Fuel cell, fuel cell system, vehicle and fuel cell performance recovery system

Abstract

The utility model provides a fuel cell, a fuel cell system, a vehicle and a fuel cell performance recovery system.The fuel cell is applied to the field of fuel cells, the fuel cell comprises a cell body and an electric pile arranged in the cell body, and the electric pile comprises a plurality of single cells; each single battery of the plurality of single batteries is provided with an activation switch, the activation switch is used for activating the corresponding single battery, and the activation switch comprises a switch body; the first end and the second end are arranged on the switch body, the first end is connected with the positive electrode of the single battery, and the second end is connected with the negative electrode of the single battery; and the movable connecting piece is arranged on the switch body. According to the application, the activation switches corresponding to the single batteries are connected with the positive and negative electrodes of the single batteries, so that the weak single batteries or weak battery areas are locally activated, the performance recovery of the local areas of the galvanic pile is realized, and the service life of the system is prolonged.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and more specifically, to a fuel cell, a fuel cell system, a vehicle, and a fuel cell performance recovery system in the field of fuel cells, with the invention name Background Art

[0002] A fuel cell is a device that converts chemical energy into electrical energy, mainly composed of an anode, a cathode, and a proton exchange membrane. In a fuel cell, hydrogen undergoes an oxidation reaction at the anode, releasing protons and electrons, while oxygen accepts protons and electrons at the cathode to generate water. The proton exchange membrane is responsible for transferring protons between the anode and the cathode. However, after a fuel cell system operates for a period of time, different degrees of performance degradation will occur, and some performance degradations are reversible and can be restored by changing operating conditions.

[0003] In related technologies, offline activation is used to perform a recovery test on the entire system to achieve unified activation of the entire system. However, it is necessary to disassemble, replace, and then reassemble the entire fuel cell, which is time-consuming and laborious. Summary of the Utility Model

[0004] The present application provides a fuel cell, a fuel cell system, a vehicle, and a fuel cell performance recovery system. This method can perform local activation on weak single cells or weak cell regions according to the activation switch of the single cell, thereby achieving performance recovery of local regions of the stack and improving the lifespan of the system.

[0005] In a first aspect, a fuel cell is provided. The fuel cell includes: a cell body and a stack disposed inside the cell body. The stack includes a plurality of single cells, and an activation switch is provided on each of the plurality of single cells. Both ends of the activation switch are respectively connected to the positive and negative electrodes of the corresponding single cell, and the corresponding single cell is activated by using the activation switch.

[0006] Wherein, the activation switch includes: a switch body; a first end and a second end provided on the switch body, wherein the first end is connected to the positive electrode of the single cell, and the second end is connected to the negative electrode of the single cell; a movable connecting member provided on the switch body.

[0007] Through the above technical solution, an activation switch is provided on each single cell of the stack in the embodiment of the present application. The first end and the second end on the switch body are respectively connected to the positive and negative electrodes of the single cell, so as to control the movable connecting member on the switch body of the corresponding single cell to be connected to the first end or the second end on the switch body according to the activation requirement, thereby activating the corresponding single cell and achieving performance recovery of local regions of the stack and improving the lifespan of the system.

[0008] In combination with the first aspect, in some possible implementation manners, the multiple single cells include the first to the Nth single cells, and the first to the Nth activation switches respectively corresponding to the first to the Nth single cells are used to selectively perform an activation action on at least one of the first to the Nth single cells, where N is a positive integer.

[0009] Through the above technical solution, the embodiment of the present application can selectively perform an activation action on at least one of the first to the Nth single cells by using the first to the Nth activation switches respectively corresponding to the first to the Nth single cells, so as to meet the activation requirements of the single cells, realize the performance recovery of the local area of the stack, and improve the service life of the system.

[0010] In combination with the first aspect, in some possible implementation manners, one end of the movable connecting member of the first activation switch is connected to the positive pole of the DC / DC converter, and the other end of the movable connecting member of the first activation switch is movably connected to the first end or the second end of the first activation switch.

[0011] Through the above technical solution, the embodiment of the present application can determine whether the first single cell participates in activation according to the activation requirements. If it participates in activation, the other end of the movable connecting member of the first activation switch is movably connected to the first end of the first activation switch, otherwise the other end of the movable connecting member is movably connected to the second end of the activation switch to meet the activation requirements of the first single cell.

[0012] In combination with the first aspect, in some possible implementation manners, one end of the movable connecting member of each of the second to the Nth activation switches is connected to the second end of the previous adjacent activation switch.

[0013] Through the above technical solution, in the embodiment of the present application, by connecting one end of the movable connecting member of each of the second to the Nth activation switches to the second end of the previous adjacent activation switch, the required activated single cells can be connected in series according to the activation requirements.

[0014] In combination with the first aspect, in some possible implementation manners, the other end of the movable connecting member of each of the second to the Nth activation switches is movably connected to the first end or the second end of its own activation switch.

[0015] Through the above technical solution, the embodiment of the present application can determine whether the second to the Nth single cells participate in activation according to the activation requirements. If they participate in activation, the corresponding single cells are connected in series to meet the requirements of local activation for weak single cells or weak cell areas, so as to realize the performance recovery of the local area of the stack and improve the service life of the system.

[0016] In combination with the first aspect, in some possible implementation manners, the second end of the Nth activation switch is further connected to the negative pole of the DC / DC converter.

[0017] In combination with the first aspect, in some possible implementation manners, the activation switch is a relay, a thyristor, or a MOS transistor.

[0018] Through the above technical solution, the activation switch in the embodiment of the present application has low cost, can reduce current interference, has low power consumption, and has strong reliability.

[0019] In a second aspect, a fuel cell system is provided, and the system includes: the fuel cell described in the above embodiment; a DC / DC converter connected to the fuel cell; a controller connected to the fuel cell, configured to control the activation action of the single cell corresponding to the fuel cell.

[0020] In a third aspect, a vehicle is provided, including the fuel cell system described in the above embodiment.

[0021] In a fourth aspect, a performance recovery system for a fuel cell is provided, including: the fuel cell described in the above embodiment; a host computer configured to control the activation action of the single cell corresponding to the fuel cell. Description of the Drawings

[0022] Figure 1 is a block diagram of the fuel cell provided by the embodiment of the present application;

[0023] Figure 2 is a structural diagram of the activation switch provided by the embodiment of the present application;

[0024] Figure 3 is a block diagram of the fuel cell system provided by the embodiment of the present application;

[0025] Figure 4 is a schematic diagram of the fuel cell system provided by the embodiment of the present application;

[0026] Figure 5 is a block diagram of the performance recovery system for the fuel cell provided by the embodiment of the present application.

[0027] Description of the Drawings: Battery body 1, stack 2, single cell 3, activation switch 4, switch body 401, first end 402, second end 403, movable connecting member 404, hydrogen pressure regulating valve 501, nitrogen and water discharge solenoid valve 502, first bypass valve 503, second bypass valve 504, first stop valve 505, second stop valve 506, back pressure valve 507, gas-water separator 6, air compressor 7, intercooler 8, humidifier 9, heater 10, thermostat 11, radiator 12, cooling fan 13, coolant water pump 14, evacuation pipeline 15, hydrogen medium-pressure pipeline 16, fuel cell system 30, fuel cell 100, DC / DC converter 200, controller 300, host computer 400, performance recovery system for fuel cell 50. Detailed implementation manners

[0028] The technical solutions in the present application will be clearly and elaborately described below in conjunction with the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B: "and / or" in the text is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

[0029] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0030] Activation refers to the process of changing the surface or molecular state of the fuel cell material by certain means to improve the performance or activity of the fuel cell. Among them, the activation process usually includes the following key functions: humidification: ensuring that the membrane electrode assembly maintains an appropriate water content; removing residual solvents and other impurities in the manufacturing process; removing anions in the catalyst and activating reaction sites.

[0031] Common activation methods include cathode starvation and potentiodynamic cycling. Specifically:

[0032] Cathode starvation: In the cathode starvation stage, by reducing the oxygen supply to the cathode (oxygen electrode), the oxygen on the cathode is insufficient, forcing the battery into a "starvation" state. In this state, the oxygen species (such as O2, OH-, H2O, etc.) on the cathode catalyst surface will decrease, which helps to clean the catalyst surface and improve the effective utilization rate of active sites.

[0033] Potentiodynamic cycling: Potentiodynamic cycling can promote different reactions at different potentials by periodically changing the potential of the battery, thereby improving the activity of the catalyst. By removing the adsorbed substances on the catalyst surface and promoting the redox reaction, the activity and stability of the catalyst can be improved.

[0034] More specifically, low potential stage: At a low potential (such as 0.2V vs. RHE), the adsorbed substances on the catalyst surface can be removed. High potential stage: At a high potential (such as 0.8V vs. RHE), the redox reaction on the catalyst surface can be promoted to improve the catalyst activity. Cycle: The above two stages constitute a cycle, and the number of cycles can be adjusted as needed.

[0035] In practical applications, cathode starvation and potentiodynamic cycling are usually used in combination to improve the activation effect. However, in the related art, offline activation of the entire fuel cell is time-consuming and laborious.

[0036] Therefore, the present application proposes that local activation can be performed on weak single cells or weak cell areas to meet the requirements of regional activation, satisfy the consistency of fuel cells, restore the performance of local areas of the stack, and improve the lifespan of the system.

[0037] Next, the application scenarios or system architectures of the embodiments of the present application will be described.

[0038] Figure 1 It is a block diagram of a fuel cell provided by an embodiment of the present application.

[0039] Exemplarily, as Figure 1 shown, the fuel cell 100 includes: a cell body 1 and a stack 2.

[0040] Among them, as Figure 2 shown, the stack 2 is disposed inside the cell body 1. The stack 2 includes a plurality of single cells 3. An activation switch 4 is provided on each single cell of the plurality of single cells 3. Both ends of the activation switch 4 are respectively connected to the positive and negative electrodes of the corresponding single cell 3, and the corresponding single cell 3 is activated by using the activation switch 4; among them, the activation switch 4 includes: a switch body 401, a first end 402, a second end 403, and a movable connecting member 404.

[0041] Among them, the first end 402 and the second end 403 are respectively disposed on the switch body 401. Among them, the first end 402 is connected to the positive electrode of the single cell 3, and the second end 403 is connected to the negative electrode of the single cell 3; the movable connecting member 404 is disposed on the switch body.

[0042] It can be understood that an activation switch 4 is provided on each single cell 3 of the stack in the embodiment of the present application. The first end 402 and the second end 403 on the switch body 401 are respectively connected to the positive and negative electrodes of the single cell 3, so as to control the connection of the movable connecting member 404 on the switch body 401 of the corresponding single cell 3 to the first end 402 or the second end 403 on the switch body 401 according to the activation requirement, thereby activating the corresponding single cell 3, realizing the performance restoration of the local area of the stack, and improving the lifespan of the system.

[0043] In the embodiment of the present application, the plurality of single cells 3 include the first to the Nth single cells 3, and the first to the Nth activation switches 4 respectively corresponding to the first to the Nth single cells 3 are used to selectively activate at least one of the first to the Nth single cells 3, where N is a positive integer.

[0044] It can be understood that the embodiments of the present application can selectively activate at least one of the first to the Nth single cells 3 by using the first to the Nth activation switches 4 corresponding to the first to the Nth single cells 3 respectively, so as to meet the activation requirements of the single cells, realize the performance recovery of local areas of the stack, and improve the lifespan of the system.

[0045] For example, as Figure 3 shown, the fuel cell stack 2 of the present application is composed of ten single cells 3 numbered CELL1 to CELL10. The present application correspondingly provides activation switches 4 including SW1 to SW10, and the corresponding single cells 3 can be activated by using the activation switches 4 according to actual needs.

[0046] In the embodiments of the present application, as Figure 2 and Figure 4 shown, one end of the movable connecting member 404 of the first activation switch 4 is connected to the positive pole of the DC / DC converter 200, and the other end of the movable connecting member 404 of the first activation switch 4 is movably connected to the first end 402 or the second end 403 of the first activation switch 4.

[0047] It can be understood that the embodiments of the present application can determine whether the first single cell 3 participates in activation according to the activation requirements. If it participates in activation, the other end of the movable connecting member 404 of the first activation switch 4 is movably connected to the first end 402 of the first activation switch 4; otherwise, it is connected to the second end 403 of the first activation switch 4 to meet the activation requirements of the first single cell.

[0048] In the embodiments of the present application, as Figure 2 and Figure 4 shown, one end of the movable connecting member 404 of each of the second to the Nth activation switches 4 is connected to the second end 403 of the previous adjacent activation switch 4, and the other end of the movable connecting member 404 of each of the second to the Nth activation switches 4 is movably connected to the first end 402 or the second end 403 of its own activation switch 4.

[0049] Among them, the second end 403 of the Nth activation switch 4 is also connected to the negative pole of the DC / DC converter 200.

[0050] It can be understood that the embodiments of the present application can determine whether the second to the Nth single cells 3 participate in activation according to the activation requirements. If they participate in activation, the corresponding single cells 3 are connected in series to meet the requirements for local activation of weak single cells or weak cell areas, so as to realize the performance recovery of local areas of the stack and improve the lifespan of the system.

[0051] It should be noted that if all the single cells do not need activation, the connection between the activation switch and the DC / DC converter is disconnected to control that all the single cells do not participate in activation; if there are single cells that need activation, the movable connection end of the movable connection part of the activation switch corresponding to the single cell to be activated is controlled to be connected to the first end of the activation switch.

[0052] For example, if the first single cell, the second single cell, the sixth single cell, the seventh single cell, the ninth single cell, and the tenth single cell participate in activation, one end of the movable connection part of the corresponding first activation switch is connected to the positive pole of the DC / DC converter; the other end is movably connected to the first end of the first activation switch; and one end of the respective movable connection parts of the activation switches corresponding to the second single cell, the sixth single cell, the seventh single cell, the ninth single cell, and the tenth single cell is connected to the second end of the previous adjacent activation switch, and the other end is movably connected to the first ends of the second activation switch, the sixth activation switch, the seventh activation switch, the ninth activation switch, and the tenth activation switch, and the second end of the tenth activation switch is connected to the negative pole of the DC / DC converter.

[0053] In the embodiment of the present application, the activation switch 4 is a relay, a thyristor, or a MOS transistor.

[0054] It can be understood that the activation switch in the embodiment of the present application has a low cost, can reduce current interference, has low power consumption, and high reliability.

[0055] It should be noted that the activation switch 4 is controlled by a host computer and can be a relay, a thyristor, a MOS transistor, or other switches that can achieve electronic control, without specific limitation.

[0056] Specifically, a relay can achieve mechanical isolation, enabling a part of the circuit to be completely isolated from another part, thus avoiding interference caused by direct current flow; it has a high load capacity and can handle relatively high current and voltage levels; it has high reliability, is easy to control, and has versatility.

[0057] A thyristor is a fully solid-state device with almost no loss in the conducting state, so its efficiency is very high; it can complete the switching from the off state to the on state in a very short time and is suitable for applications that require fast response; it has high voltage resistance, small size, and high durability.

[0058] A MOS transistor has a low resistance and small loss in the conducting state and is suitable for low-power applications; its switching speed is very fast, reaching the microsecond or even nanosecond level, and it is suitable for high-frequency circuits; it has a small size, light weight, is easy to drive, and has a low cost.

[0059] In summary, for the fuel cell of the present application, an activation switch is provided on each single cell of the stack, and the activation switch is used to perform an activation action on the corresponding single cell, so as to perform local activation on weak single cells or weak cell areas, thereby realizing performance recovery of local areas of the stack and improving the life of the system.

[0060] Figure 3 It is a schematic block diagram of a fuel cell system provided by an embodiment of the present application.

[0061] Exemplarily, as Figure 3 shown, the fuel cell system 30 includes: a fuel cell 100, a DC / DC converter 200, and a controller 300.

[0062] Among them, the DC / DC converter 200 is connected to the fuel cell 100; the controller 300 is connected to the fuel cell 100 and is used to control the activation action of the single cells corresponding to the fuel cell.

[0063] It can be understood that the embodiment of the present application can use the controller to control the activation action of the single cells corresponding to the fuel cell, so as to perform local activation on weak single cells or weak cell areas, thereby realizing performance recovery of local areas of the stack and improving the life of the system.

[0064] As Figure 4 shown, the fuel cell system further includes: a valve assembly.

[0065] Among them, the valve assembly includes: a hydrogen pressure regulating valve 501, a nitrogen and water discharge solenoid valve 502, a first bypass valve 503, a second bypass valve 504, a first stop valve 505, a second stop valve 506, and a back pressure valve 507. Among them, one end of the hydrogen pressure regulating valve 501 is connected to the fuel cell 100 through a pipeline, and the other end is connected to a hydrogen medium-pressure pipeline 16.

[0066] It can be understood that the valve assembly of the embodiment of the present application can effectively control the hydrogen pressure of the fuel cell system, discharge non-reactive gases and moisture, provide the ability for system maintenance and emergency treatment, and ensure that the system operates in an optimal state.

[0067] Specifically, the hydrogen pressure regulating valve 501 is used to control the hydrogen pressure at the anode inlet of the stack. Usually, in the fuel cell electronic control unit, the opening of the hydrogen injection valve is adjusted by a PID controller to ensure the stability of the hydrogen pressure entering the stack; the nitrogen and water discharge solenoid valve 502 is used to discharge the nitrogen at the anode and the liquid water in the gas-water separator to the tail row.

[0068] The first bypass valve 503 is used to allow air to directly enter the tail exhaust and not enter the fuel cell stack after the valve is opened; the second bypass valve 504 is used to allow air to enter the interior of the fuel cell stack after the valve is opened; the first shut-off valve 505 is used to allow air to enter the cathode of the fuel cell stack for a chemical reaction after the valve is opened; the second shut-off valve 506 is used to allow air to be discharged from the fuel cell stack after the valve is opened; the back pressure valve 507 is used to control the pressure of the cathode of the fuel cell stack by adjusting the opening degree of the valve.

[0069] As Figure 4 shown, the fuel cell system further includes: a gas-water separator 6.

[0070] Wherein, one end of the gas-water separator 6 is connected to the anode of the fuel cell 100, and the other end is connected to the nitrogen and water discharge solenoid valve 502 through a pipeline, and the other end of the nitrogen and water discharge solenoid valve 502 is connected to the exhaust pipeline 15.

[0071] It can be understood that the gas-water separator 6 in the embodiment of the present application separates moisture and other non-reactive gases in hydrogen, improves the system processing efficiency, and improves the performance, reliability, environmental friendliness and safety of the fuel cell system.

[0072] As Figure 4 shown, the fuel cell system further includes: an air compressor 7, an intercooler 8 and a humidifier 9.

[0073] Wherein, one end of the air compressor 7 is connected to the first bypass valve 503 and the second bypass valve 504 through a pipeline, the other end of the second bypass valve 504 is connected to the humidifier 9 through a pipeline, the other end of the humidifier 9 is connected to the first shut-off valve 505 through a pipeline, and the other end of the first shut-off valve 505 is connected to the fuel cell stack 2; the other end of the first bypass valve 503 is connected to the exhaust pipeline 15 and the back pressure valve 507 through a pipeline, the other end of the back pressure valve 507 is connected to the humidifier 9 through a pipeline, and the other end of the humidifier 9 is connected to the second shut-off valve 506.

[0074] It can be understood that in the embodiment of the present application, by increasing the intake pressure with an air compressor, reducing the intake temperature with an intercooler, and controlling the intake humidity with a humidifier, the efficiency and performance of the fuel cell system can be significantly improved.

[0075] Specifically, the air compressor 7 is used to provide air with a suitable stoichiometric ratio for the cathode of the fuel cell stack; the intercooler 8 is used to reduce the temperature of the high-temperature air after supercharging and increase the intake air volume; the humidifier 9 is used to humidify the dry air to ensure the water content of the air entering the fuel cell stack.

[0076] As Figure 4 shown, the fuel cell system further includes: a heater 10, a thermostat 11, a radiator 12, a cooling fan 13 and a coolant water pump 14.

[0077] One end of the thermostat 11 is connected to the fuel cell stack 2, and the other end is connected to the radiator 12. A cooling fan 13 is provided on the radiator 12. One end of the radiator 12 is connected to the heater 10 and the coolant pump 14, and the other end of the coolant pump 14 is connected to the fuel cell stack 2.

[0078] It can be understood that the embodiments of the present application can realize the effective control of the temperature of the fuel cell stack by the combined use of the heater 10, the thermostat 11, the radiator 12 and the coolant pump 14, ensure that it works within the optimal temperature range, improve the working efficiency of the fuel cell, and extend the service life of the fuel cell.

[0079] It should be noted that the heater 10 generates heat using electrical energy to heat the fuel cell system; the thermostat 11 adjusts the circulating water flow distribution by adjusting the valve opening. The radiator 12 effectively dissipates the heat in the coolant into the air to prevent the fuel cell from overheating. The cooling fan 13 is used to cool the radiator. The coolant pump 14 can drive the coolant to circulate in the system to ensure the uniform distribution of the coolant and improve the cooling effect.

[0080] Specifically, the high potential and potential cycle caused by the start-stop condition will inevitably cause the oxidation and dissolution of the catalyst platinum (Pt). The formation of Pt oxide belongs to reversible loss, and the dissolution of Pt into free ions belongs to irreversible loss. Therefore, after the Pt oxidation reaction occurs, it is directly reflected in the decrease of the stack performance. Before Pt dissolves in ionic state, it can be electrochemically reduced through specific operating conditions. Due to the short duration of the cathode starvation activation method and the high performance recovery, it can quickly reduce Pt oxide and improve the activity and utilization rate of the cathode-side catalyst, etc. These advantages are widely used in laboratory tests.

[0081] When the cathode side of the stack is supplied with sufficient gas, the cathode-side catalyst Pt will be oxidized to form oxides, forming an oxide film or particles, thereby reducing the catalytic area and lowering the catalytic activity, resulting in performance degradation; while the present application can promote the reverse reaction by reducing the cathode flow rate, reduce Pt-Ox to Pt, and restore the catalyst activity, thereby achieving performance recovery, i.e., activation, and repeating several times to achieve the activation effect. At the same time, it should be noted that during the starvation process, the voltage is low and the heat generation is high, and the duration should not be too long. The coolant flow rate should be increased in advance to prevent the stack temperature from being too high.

[0082] In summary, the fuel cell system of the present application adjusts the operating states of the various components of the system according to different working conditions, ensures the stable operation of the system under different environmental conditions, guarantees the stability, safety and working efficiency of the fuel cell system, and extends the service life of the fuel cell.

[0083] In addition, the embodiments of the present application also protect a vehicle, which includes the fuel cell system provided by the embodiments of the present application.

[0084] Figure 5 It is a block diagram of a performance recovery system for a fuel cell provided by an embodiment of the present application.

[0085] Exemplarily, as Figure 5 shown, the performance recovery system 50 of the fuel cell may include: a fuel cell 100 and a host computer 400.

[0086] Among them, the host computer 400 is connected to all activation switches 4 of the fuel cell and is used to control the activation actions of the individual cells corresponding to the fuel cell.

[0087] It can be understood that the embodiment of the present application can use the host computer 400 to control the activation actions of the individual cells corresponding to the fuel cell, so as to perform performance recovery on the individual cells to be activated and improve the lifespan of the system.

[0088] It should be noted that the host computer refers to a computer device responsible for monitoring and controlling the lower computer in the control system. The opening and closing of the switches controlled by the host computer in the present application belong to the prior art.

[0089] For example, control is performed through the switch selection on the configuration interface of the host computer 400. Select whether each individual cell 3 is to be activated, and then control the corresponding switch to close. As Figure 4 shown, for example: if activation switches SW1, SW2, SW6, SW7, SW9, and SW10 are selected, the corresponding single cells will participate in the activation, while those not selected will not participate, achieving precise selective repair. And the number of selected single cells must be greater than 1, otherwise the program cannot be executed.

[0090] It should be noted that the system needs to be correctly connected before the process is executed. After connection, the number of cells to be activated needs to be configured first. After selection, the activation method needs to be configured, and then it needs to be executed.

[0091] In summary, for the performance recovery system of the fuel cell of the present application, the host computer is used to control the opening and closing of all activation switches, and control the activation actions of the individual cells with the activation switches turned on, so as to perform performance recovery on the individual cells to be activated and improve the lifespan of the system.

[0092] Through the description of the above embodiments, those skilled in the art can understand that for the convenience and brevity of description, only the above division of each functional module is used as an example for illustration. In practical applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0093] In the embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical or other forms.

[0094] The above content is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A fuel cell, characterized in that, Comprising: A battery body and a stack disposed inside the battery body, wherein The stack includes a plurality of single cells, and an activation switch is provided on each single cell of the plurality of single cells, and the corresponding single cell is activated by using the activation switch; Wherein, the activation switch includes: a switch body; a first end and a second end disposed on the switch body, wherein the first end is connected to the positive electrode of the single cell, and the second end is connected to the negative electrode of the single cell; a movable connecting member disposed on the switch body.

2. The fuel cell according to claim 1, wherein The plurality of single cells include first to Nth single cells, and at least one of the first to Nth single cells is selectively activated by using first to Nth activation switches corresponding to the first to Nth single cells respectively, wherein N is a positive integer.

3. The fuel cell according to claim 2, wherein One end of the movable connecting member of the first activation switch is connected to the positive electrode of the DC / DC converter, and the other end of the movable connecting member of the first activation switch is movably connected to the first end or the second end of the first activation switch.

4. The fuel cell according to claim 2, wherein One end of the movable connecting member of each of the second to Nth activation switches is connected to the second end of the previous adjacent activation switch.

5. The fuel cell according to claim 4, wherein The other end of the movable connecting member of each of the second to Nth activation switches is movably connected to the first end or the second end of its own activation switch.

6. The fuel cell according to claim 2, wherein The second end of the Nth activation switch is also connected to the negative electrode of the DC / DC converter.

7. The fuel cell according to any one of claims 1-6, characterized in that, The activation switch is a relay, a thyristor or a MOS transistor.

8. A fuel cell system, characterized in that, Comprising: The fuel cell according to any one of claims 1-7; A DC / DC converter connected to the fuel cell; A controller connected to the fuel cell, configured to control the activation action of the single cell corresponding to the fuel cell.

9. A vehicle, comprising the fuel cell system according to claim 8.

10. A performance recovery system for a fuel cell, characterized in that, Comprising: The fuel cell according to any one of claims 1-7; A host computer communicating with the fuel cell, configured to control the activation action of the single cell corresponding to the fuel cell.

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