Method and electronic device for operating and / or fueling a compressed gas supply system

Abstract

The invention relates to a method for operating and / or fueling a compressed gas supply system (34) having at least two compressed gas tanks (15, 16, 17, 18, 19) which are attached to an anode path (2) of a fuel cell system (1). In order to increase the thermal safety during the operation and / or during the fueling of the compressed gas supply system (34), valve devices (21, 22, 23, 24, 25) associated with the compressed gas tanks (15, 16, 17, 18, 19) are individually controlled by a control device, for each of the compressed gas tanks (15, 16, 17, 18, 19), the valve devices (21, 22, 23, 24, 25) are individually controlled by a control unit. The valve devices (21, 22, 23, 24, 25) comprise a filling path with an actively switchable filling valve and an unloading path with an actively switchable unloading valve, the control device is connected with a sensor device in the sensor aspect, and the sensor device comprises at least one sensor which detects the current temperature in the corresponding valve device (21, 22, 23, 24, 25).

Description

Technical Field

[0001] The invention relates to a method for operating and / or refueling a compressed gas supply system having at least two compressed gas tanks attached to the anode path of a fuel cell system. The invention also relates to an electronic device, in particular a control unit for a vehicle, in particular a control unit for a fuel cell vehicle. Background Art

[0002] From German laid-open patent application DE 10 2020 206 230 A1, a method for initial adjustment of a fuel cell of a fuel cell stack of a fuel cell vehicle is known, wherein the fuel cell can be controlled by means of a control unit of the fuel cell stack, wherein the fuel cell is initially adjusted at least partially or completely by means of the control unit. From German laid-open patent application DE 10 2020 212 077 A1, a method for operating a fuel cell system is known, in which method hydrogen is taken from a hydrogen storage device and supplied via an anode path of an anode of a fuel cell stack, and in which method the mass flow of hydrogen is predetermined by a hydrogen metering valve arranged in the anode path, wherein the pressure is variably adjusted independently of the mass flow by means of a controllable pressure reducer arranged in the anode path upstream of the hydrogen metering valve, wherein the pressure is adjusted as a function of at least one current condition, in particular as a function of the ambient temperature, the time of the last refueling process, the filling level in the hydrogen storage device, the calibrated pressure after the pressure reducer, the pressure in the anode, the pressure in the cathode and / or the supplied hydrogen mass flow. A similar method for operating a fuel cell system is known from German laid-open patent application DE 10 2020 210 300 A1, in which hydrogen removed from a compressed gas container is thermally conditioned by means of a heat exchanger arranged in the anode path. Summary of the invention

[0003] The object of the present invention is to simplify or improve the operation and / or refueling of a compressed gas supply system having at least two compressed gas tanks attached to the anode path of a fuel cell system.

[0004] In a method for operating and / or refueling a compressed gas supply system having at least two compressed gas tanks attached to the anode path of a fuel cell system, the object is solved in the following manner: the valve devices assigned to the compressed gas tanks are individually controlled by a control device, for each of the compressed gas tanks, the valve device comprises a filling path with an actively switchable filling valve and an unloading path with an actively switchable unloading valve, the control device being connected to a sensor device in terms of sensors, the sensor device comprising at least one sensor, the at least one sensor detecting the current temperature in the corresponding valve device. The method is used, for example, in a fuel cell system comprising a hydrogen-based fuel cell, in which hydrogen is converted into electrical energy with the aid of oxygen. The electrical energy thus provided is used in mobile applications, for example in an electric motor of a vehicle for driving. However, the method claimed can also be applied in an internal combustion engine system, in which hydrogen is used for combustion. Each of the compressed gas tanks can be filled and emptied individually by means of an actively switchable valve. On the one hand, this provides a huge advantage when refueling the compressed gas tank in the compressed gas supply system at a corresponding refueling station (e.g., a hydrogen filling station). On the other hand, when the compressed gas supply system is in operation and when the motor vehicle equipped with the compressed gas supply system is parked, the compressed gas contained in the compressed gas tank, especially hydrogen, can be transported between the individual compressed gas tanks as needed. Therefore, on the one hand, time can be saved when refueling. Also compared with the conventional compressed gas supply system, a single compressed gas tank can be filled with more compressed gas if necessary. In addition, when necessary, a single compressed gas tank can also be operated at the minimum limit pressure, because when necessary, a single compressed gas tank can be quickly and simply separated from the compressed gas supply system for a certain time and connected by closing the actively switchable valve. In the valve device respectively assigned to the individual compressed gas tank, not only the temperature is detected by means of a sensor device (the sensor device advantageously includes a plurality of sensors). Advantageously, other fluid operation data are also detected in the corresponding valve device with the sensor device, such as the pressure at the branching point in the valve device and / or the mass flow through the corresponding valve device when filling or emptying the compressed gas tank. The control unit is equipped with a suitable software product in order to process the signals of the sensors of the sensor arrangement and to actuate the switching valves, ie the actively switchable filling valve and the actively switchable unloading valve, respectively and individually.

[0005] A preferred embodiment of the method is characterized in that the control device is equipped with a data set product, which contains reference data and / or limit data of the fluid, by means of which the valve device is controlled according to the current temperature detected in the valve device during the refueling process of the compressed gas supply system and / or during operation, so that the compressed gas tank temperature detected in the same way in the compressed gas tank is kept below the first limit temperature. The reference data and / or limit data of the fluid include at least one limit temperature, preferably a plurality of different limit temperatures, a temperature characteristic curve and / or a temperature composite characteristic curve. The compressed gas tank temperature is detected in all compressed gas tanks with a suitable sensor. The temperature detection in the valve device can advantageously detect the temperature of the hydrogen in the corresponding filling path and unloading path. Therefore, in combination with the compressed gas tank temperature detected in the same way, the most effective temperature control or temperature regulation is achieved not only during the refueling of the compressed gas supply system but also during operation.

[0006] Another preferred embodiment of the method is characterized in that the control unit is equipped with a data set product, which contains reference data and / or limit data of the fluid, with the help of which the valve device is controlled according to the current temperature detected in the valve device during the refueling process and / or operation of the compressed gas supply system, so that, as soon as the second limit temperature is reached in the relevant compressed gas tank, the increase in the temperature of the individual compressed gas tank in one of the compressed gas tanks is limited by the control of the corresponding valve device. For the limitation of the temperature of the individual compressed gas tank by controlling the corresponding valve device, the English term derating can also be used. Derating means in particular to reduce, decrease or lower. The use of two limit temperatures can further improve the temperature control or temperature regulation during the operation of the compressed gas supply system and also during refueling.

[0007] Another preferred embodiment of the method is characterized in that the filling path of the compressed gas tank, whose detected compressed gas tank temperature is below a first limit value, is opened by a filling valve in a corresponding valve device in order to meet a predetermined safety requirement. For example, the safety requirement includes reaching a legally predetermined safety value during operation of the compressed gas supply system. If the predetermined safety value is reached, the filling path of the compressed gas tank is blocked again.

[0008] Another preferred embodiment of the method is characterized in that at least one discharge path of the compressed gas tank is opened by a discharge valve in the corresponding valve device in order to discharge heat introduced into the corresponding compressed gas tank from the outside in a targeted manner from the compressed gas tank. This can further increase the safety during operation of the compressed gas supply system and / or during refueling thereof. As soon as sufficient heat has been discharged, the discharge path of the corresponding compressed gas tank is blocked again.

[0009] Another preferred embodiment of the method is characterized in that the filling path and / or the unloading path of the valve device is controlled in a targeted manner by the control device in order to adjust the compressed gas tank temperature in the compressed gas tank over time. A correspondingly optimized removal strategy from the individual compressed gas tanks achieves the desired limitation of the temperature in the compressed gas tank in a simple manner. As a result, predefined safety requirements can be easily met.

[0010] Another preferred embodiment of the method is characterized in that, if the compressed gas tanks have different internal tank pressures during refueling, after the filling valves have been actuated, the compressed gas tanks are refueled in cascade via non-return valves in the filling paths of the associated valve devices. Advantageously, the relevant compressed gas tank is only filled if the internal tank pressure in the compressed gas tank is exceeded during refueling. This can effectively increase the efficiency during refueling.

[0011] Another preferred embodiment of the method is characterized in that compressed gas tanks with different storage volumes are refueled not simultaneously but in a time-staggered manner via the respectively assigned filling paths, wherein the filling path of the compressed gas tank with the larger storage volume is opened by the control device before the filling path of the compressed gas tank with the smaller storage volume in time. In the case of two compressed gas tanks of different sizes, for example, the larger compressed gas tank is filled first. In the case of multiple larger compressed gas tanks, these larger compressed gas tanks are advantageously filled in a cascade manner before the smaller compressed gas tanks are filled. If during the refueling process, the compressed gas tank temperature in the compressed gas tank exceeds the limit temperature, the filling process of the corresponding compressed gas tank can be easily interrupted, while the other compressed gas tanks will only continue to be filled.

[0012] Another preferred embodiment of the method is characterized in that the compressed gas is moved in a targeted manner between the compressed gas tanks by means of the associated valve device in order to carry out an internal balancing in the compressed gas supply system. Here, the control is also advantageously carried out by the control unit. By moving the compressed gas between the compressed gas tanks, an intelligent operating strategy and / or refueling strategy is implemented on the control unit, for example with the aid of artificial intelligence. Before the limit temperature is reached, for example, the filling process of the relevant compressed gas tank can be delayed in a targeted manner.

[0013] If necessary, the invention also relates to a compressed gas supply system having at least two compressed gas tanks attached to the anode path of a fuel cell system, wherein the compressed gas tanks are each provided with a valve device having a filling path and a discharge path, in which an actively switchable filling valve is arranged, and in which an actively switchable discharge valve is arranged. In this case, due to the required paths and actively switchable valves in the valve device, higher production costs are intentionally tolerated.

[0014] A preferred embodiment of the compressed gas supply system is characterized in that the filling path and the unloading path in the valve device are connected fluidically in parallel between the tank interior space and the branching of the corresponding compressed gas tank. It is thus achieved in a simple manner that each of the compressed gas tanks can be filled individually via a filling path with an actively switchable filling valve. Each of the compressed gas tanks can be unloaded individually via an unloading path with a switchable unloading valve. Therefore, the compressed gas supply system can operate more efficiently than conventional compressed gas supply systems not only when refueling but also when operating under extreme environmental conditions (especially ambient temperature).

[0015] Another preferred embodiment of the compressed gas supply system is characterized in that the filling valve is arranged in the filling path between a branch and a nonreturn valve, which is blocked in the direction of the filling valve, wherein in the discharge path the nonreturn valve is arranged between the discharge valve and the branch, which is blocked in the direction of the discharge valve. This prevents malfunctions during operation of the compressed gas supply system.

[0016] Another preferred embodiment of the compressed gas supply system is characterized in that a valve device with a filling path, a filling valve, a discharge path, a discharge valve and a bifurcation is integrated in a valve block, which is installed on a corresponding compressed gas tank. In addition to the components mentioned, the valve block includes other components that are partly legally required, such as a check valve, a filter, a sensor and particularly advantageously a pressure limiter. The valve block is preferably installed on the end of the corresponding compressed gas tank. For manufacturing technical reasons, the valve block is preferably manufactured independently of the compressed gas tank. For example, the valve block is screwed into the opening of the compressed gas tank. In order to seal between the valve block and the compressed gas tank, a simple sealing ring, such as an O-ring, can be used. By integrating an actively switchable valve in the valve block, the combination of the valve device claimed and a conventional compressed gas tank can be realized in a simple manner.

[0017] Another preferred embodiment of the compressed gas supply system is characterized in that the filling valve and the unloading valve are designed as electromagnetically actuable 2 / 2-way valves. The 2 / 2-way valves have a closed position and an open position, in which the corresponding path is open. The two valves are preferably tensioned in their respective closed positions, in which the passage of the fluid through the respective path is interrupted. The valves can be opened by electromagnetic actuation. This increases safety during operation of the compressed gas supply system.

[0018] Another preferred embodiment of the compressed gas supply system is characterized in that the filling valve and the unloading valve are connected to a control device in terms of control, and the control device is connected to a sensor device in terms of sensors, which includes at least one sensor that can detect operating data of the fluid such as pressure, temperature and / or mass flow at the branching point. As a result, a comfortable regulation of the temperature, pressure and / or filling level in the corresponding compressed gas tank is achieved in a simple manner. Advantageously, a data set is stored in the control device, which contains corresponding reference data and / or limit data for pressure, temperature and / or mass flow.

[0019] In the method for operating the aforementioned compressed gas supply system, the above-described object is achieved alternatively or additionally in that the filling valve and the unloading valve are individually controlled by a control device according to the operating data of the fluid detected by the sensor device. As a result, individual compressed gas tanks can be filled and emptied individually when necessary. On the one hand, this brings advantages when refueling the compressed gas tanks of the compressed gas supply system. In addition, it brings obvious advantages during the operation of the compressed gas supply system.

[0020] A preferred embodiment of the method is characterized in that the filling valve and the unloading valve are individually controlled by the control unit so that the compressed gas tanks are not filled and / or emptied uniformly. It is particularly advantageous if the compressed gas supply system contains compressed gas tanks of different sizes and / or also compressed gas tanks that are exposed to different environmental conditions, in particular ambient temperatures, in the installed state. This can be due, for example, to the fact that the individual compressed gas tanks are arranged more externally in or on the motor vehicle, which can lead to these compressed gas tanks heating up more quickly under strong sunlight than compressed gas tanks that are still arranged in the vehicle interior.

[0021] The invention also relates to an electronic device, preferably a control device of a vehicle, in particular a control device of a fuel cell vehicle, which is configured to implement the above-described method. The electronic device can be used to individually control the valve devices of individual compressed gas tanks. This allows for a comfortable adjustment of the filling level, temperature and / or pressure in the individual compressed gas tanks in a compressed gas supply system.

[0022] If necessary, the invention also relates to a valve device, in particular a valve block, a filling valve, a relief valve, a sensor device, a sensor, a non-return valve and / or a compressed gas tank for the aforementioned compressed gas supply system. The mentioned parts can be handled separately. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Further advantages, features and details of the invention emerge from the following description, in which various exemplary embodiments are explained in detail with reference to the drawings.

[0024] It shows:

[0025] Figure 1 a schematic representation of a compressed gas supply system with a total of five compressed gas tanks, which are filled at a hydrogen filling station, wherein each of the compressed gas tanks is equipped with a valve device, which comprises a filling path with an actively switchable filling valve and an unloading path with an actively switchable unloading valve; and

[0026] Figure 2 In the form of a fluid circuit diagram from Figure 1 One of the valve devices. DETAILED DESCRIPTION

[0027] exist Figure 1 , a hydrogen filling station 40 is schematically depicted. Arrows 38 indicate that a motor vehicle (not shown in greater detail) having a fuel cell system 1 is refueled with hydrogen at the hydrogen filling station 40 .

[0028] The fuel cell system 1 comprises a fuel cell stack (not shown in greater detail) having fuel cells, each of which comprises an anode to which hydrogen is supplied via an anode path 2. The design and function of such fuel cell systems are known per se.

[0029] A check valve 3, a filter 4, a pressure sensor 5, a temperature sensor 6, a temperature sensor 8, a further pressure sensor 9, a further filter 10, a pressure reducer 11, a further filter 12 and a check valve 13 are arranged in the anode path 2. A flow branch 7 is provided between the temperature sensor 6 and the temperature sensor 8. A header 14 opens into the anode path 2 at the flow branch 7.

[0030] A total of five compressed gas tanks 15, 16, 17, 18 and 19 of the compressed gas supply system 34 are fluidically connected to the manifold 14. The compressed gas tanks 15 to 19 are partially of different sizes. The compressed gas tanks 15 to 17 are approximately of the same size, but are larger than the two compressed gas tanks 18, 19, which are also of the same size.

[0031] Compressed gas tanks 15 to 19 are located in Figure 1 The left end is provided with valve devices 21 to 25 respectively. Figure 1 At the middle right end, the compressed gas tanks 15 to 19 are each equipped with a valve device 26 to 30. The compressed gas tanks 15 to 19 are connected to the manifold 20 via the valve devices 26 to 30. The manifold 20 is used, for example, to manually empty the compressed gas tanks 15 to 19. The valve devices 26 to 30 are then embodied as tank drain valves.

[0032] The valve devices 21 to 25 are all designed identically and are referred to below. Figure 2 According to Figure 1 The valve device 21 at the left end of the compressed gas tank 15 is described in detail. The valve device 21 is connected to the manifold 14 via a joint pipe or a connecting pipe 31. Figure 2 In FIG. 2 , the tank interior space, which is designated by 64 , of the compressed gas tank 15 can be connected to the collecting pipe 14 and the anode path 2 via a valve device 21 .

[0033] The valve device 21 is integrated into a valve block 50, which is Figure 2 The compressed gas tank 15, which is designed as a gas cylinder, is installed as shown in FIG. Figure 2 On the upper end of the middle.

[0034] exist Figure 2 The upper middle portion schematically shows a hydrogen filling station 40 with a refueling path 38, which is symbolically indicated by arrows. The hydrogen filling station 40 can be connected to a control device 43 via an infrared interface 41 and a control tube 42. Figure 1 In the fuel cell system 1 shown in FIG. 1 , a control unit 43 is associated with the compressed gas supply system 34 and the fuel cell system 1 in the fuel cell vehicle.

[0035] Hydrogen refueling station 40 Figure 2 Outlined above. Figure 2 The compressed gas tank 15 implemented as a gas cylinder is outlined in the lower middle. Figure 2 The tank interior space 64 of the compressed gas tank 15 is connected to the emptying path 61, the filling path 65 and the unloading path 70. The three paths 61, 65 and 70 extend through the valve block 50.

[0036] exist Figure 2 In the middle top, the connection pipe 31 is connected to the valve block 50 at the connection point 52. The connection pipe 51 extends from the connection point 52 to the fluid branch 53 in the valve block 50. The connection pipe 51 is preferably implemented as a connecting channel in the valve block 50. For simplicity, all fluid connections are referred to as pipes below. However, in the valve block 50, all pipes are preferably implemented as bores.

[0037] An optional hydraulic resistor in the form of a throttle valve is provided in the connecting pipe 51. A filter 57 is arranged between the hydraulic resistor 56 and the branch 53. From the branch 53, an emptying path 61 is provided, which leads to the tank interior 64. In the emptying path 61, two valves 62 and 63 are connected in series. The valve 62 is a manual emptying valve or drain valve. If necessary, for example, when it is shut down at the end of its service life, the compressed gas tank 15 can be manually emptied via the valve 62.

[0038] The valve 63 is a heat-activated pressure relief valve. The tank interior 64 can be relieved via the valve 63. A manually operable shut-off valve 58 is arranged between the branch 53 and the branch 54. The manually operable shut-off valve 58 serves to safely lock the compressed gas tank 15, for example during maintenance.

[0039] From branch 54, a sensor line 59 is derived, via which operating data such as pressure, temperature and / or fluid mass flow are detected by means of a sensor device 60 during operation of the pressure supply system at branch 54 in valve block 50. Connecting pipe 51, which originates from branch 52, leads to branch 55, from which a filling path 65 originates and to which a discharge path 70 leads.

[0040] A filling valve 66 and a non-return valve 67 are connected in series in the filling path 65. The non-return valve 67 opens in the direction of the tank interior 64 and closes in the direction of the filling valve 66. The filling path 65 runs from the branch 55 parallel to the discharge path 70.

[0041] In the unloading path 70, a check valve 71, an unloading valve 72, a filter 73 and a flow limiter 74 are connected in series. The check valve 71 is locked in the direction of the unloading valve 72 and opens in the direction of the branch 55. The flow limiter 74 is used to limit leakage in the event of an undesired pipe disconnection.

[0042] The filling valve 66 and the unloading valve 72 are designed as two-way valves with an open position and a closed position. The two valves 66 and 72 are electromagnetically actuated and are connected to the control device 43 in terms of control. As indicated by the spring symbol, the two valves 66 and 72 are prestressed in their respective closed positions. The sensor device 60 is also connected to the control device 43 in terms of sensor or control. Figure 2 In FIG. 7 , the control line or signal line or sensor line 76 is drawn with a dashed line.

[0043] The control unit 43 is equipped with software that processes the sensor signals detected by the sensor device 60 during operation of the compressed gas supply system 34. For example, the temperature, pressure, mass flow, flow direction and possibly other measured variables are detected at the branch 54 in the valve block 50 by the sensors of the sensor device 60.

[0044] The compressed gas tanks 15 to 19 are individually controlled by the control unit 43 so that the compressed gas tanks 15 to 19 are filled and / or emptied in a non-uniform manner. For this purpose, the filling valve 66 and the unloading valve 72 are actively controlled by the control unit 43. In this way, the individual compressed gas tanks 15 to 19 can be emptied at the permissible operating system limit pressure, while at least one of the compressed gas tanks 15 to 19 remains charged with the permissible operating system limit pressure. Thus, a defined amount of compressed gas, in particular hydrogen, can be maintained in the compressed gas tank that is emptied at the permissible operating system limit pressure, which can then be used to adjust the fuel cell system 1 during system startup.

[0045] The operation of the compressed gas supply system 34 and the fuel cell system 1 at different tank internal pressures is also possible by actively opening the filling path 65 via the filling valve 66 by means of the control unit 43. Depending on the operating mode of the vehicle equipped with the fuel cell system 1 and the compressed gas supply system 34 (e.g. driving operation, parking, refueling), the switching valves 66 and 72 are controlled individually.

[0046] By means of targeted temporal regulation or control of the pressure and / or temperature of the individual compressed gas tanks 15 to 19, a pressure drop below the limit pressure determined by the system is advantageously achieved. This drop is particularly advantageous when the system is started, when the system is pre-filled with compressed gas tanks at low pressure (i.e., filled with hydrogen or adjusted with hydrogen for operation). This adjustment can be carried out until a very low residual pressure is reached. This increases the effective range of the system.

[0047] The claimed method makes it possible to achieve targeted, time-dependent regulation or control of the compressed gas tank temperature by means of an optimized strategy derived from the individual compressed gas tanks. The compressed gas tank temperature in the individual compressed gas tanks can thus be limited in order to increase operational safety. By means of actively switchable valves, a rise in the compressed gas tank temperature can be promptly responded to by means of derating.

[0048] If the compressed gas tanks have different pressures during refueling, the nonreturn valve 67 in the filling path 65 provides cascade refueling after the filling valve 66 is switched on. The relevant compressed gas tank is only filled when the current pressure in the relevant compressed gas tank is exceeded during refueling.

Claims

1. A method for operating and / or refueling a compressed gas supply system (34), the compressed gas supply system having at least two compressed gas tanks (15, 16, 17, 18, 19) being attached to the anode path (2) of a fuel cell system (1), characterized in that The valve devices (21, 22, 23, 24, 25) assigned to the compressed gas tanks (15, 16, 17, 18, 19) are individually controlled by a control unit (43), for each of the compressed gas tanks (15, 16, 17, 18, 19), the valve device comprising a filling path (65) with an actively switchable filling valve (66) and a discharge path (70) with an actively switchable discharge valve (72), the control unit being connected to a sensor device (60) in terms of sensors, the sensor device comprising at least one sensor, the at least one sensor detecting the current temperature in the corresponding valve device (21, 22, 23, 24, 25).

2. The method according to claim 1, characterized in that The control unit (43) is equipped with a data set product, which contains reference data and / or limit data of the fluid. With the help of the reference data and / or limit data of the fluid, the valve device (21, 22, 23, 24, 25) is controlled according to the current temperature detected in the valve device (21, 22, 23, 24, 25) during the refueling process and / or operation of the compressed gas supply system (34), so that the compressed gas tank temperature also detected in the compressed gas tank (15, 16, 17, 18, 19) is kept below a first limit temperature.

3. The method according to claim 2, characterized in that The control unit (43) is equipped with a data set product, which contains reference data and / or limit data of the fluid, with the help of which the valve device (21, 22, 23, 24, 25) is controlled according to the current temperature detected in the valve device (21, 22, 23, 24, 25) during the refueling process and / or in operation of the compressed gas supply system (34), so that as soon as a second limit temperature is reached in the relevant compressed gas tank (15, 16, 17, 18, 19), the increase in the temperature of an individual compressed gas tank in one of the compressed gas tanks (15, 16, 17, 18, 19) is limited by controlling the corresponding valve device (21, 22, 23, 24, 25).

4. The method according to claim 2 or 3, characterized in that The filling path (65) of the compressed gas tank (15, 16, 17, 18, 19) whose detected compressed gas tank temperature lies below the first limit value is opened by means of a filling valve (66) in the corresponding valve device (21, 22, 23, 24, 25) in order to meet predetermined safety requirements.

5. The method according to any one of claims 2 to 4, characterized in that At least one unloading path (70) of a compressed gas tank (15, 16, 17, 18, 19) is opened by means of the unloading valve (72) in the corresponding valve device (21, 22, 23, 24, 25) in order to discharge heat introduced into the corresponding compressed gas tank (15, 16, 17, 18, 19) from the outside in a targeted manner from the compressed gas tank (15, 16, 17, 18, 19).

6. The method according to any one of the preceding claims, characterized in that The filling path (65) and / or the unloading path (70) of the valve device (21, 22, 23, 24, 25) is controlled in a targeted manner by the control unit (43) in order to adjust the compressed gas tank temperature in the compressed gas tank (15, 16, 17, 18, 19) over time.

7. The method according to any one of the preceding claims, characterized in that If the compressed gas tanks (15, 16, 17, 18, 19) have different internal tank pressures during refueling, the compressed gas tanks (15, 16, 17, 18, 19) are refueled in cascade manner via non-return valves (67) in the filling paths (65) of the associated valve devices (21, 22, 23, 24, 25) after the filling valves (66) have been actuated.

8. The method according to any one of the preceding claims, characterized in that Compressed gas tanks (15, 16, 17, 18, 19) with different storage volumes are filled with fuel not simultaneously but in a time-staggered manner via respectively assigned filling paths (65), wherein the filling path of the compressed gas tank (26, 27, 28) with the larger storage volume is opened by the control unit (43) before the filling path (65) of the compressed gas tank (29, 30) with the smaller storage volume.

9. The method according to any one of the preceding claims, characterized in that Compressed gas is moved in a targeted manner between the compressed gas tanks (15, 16, 17, 18, 19) via associated valve devices (21, 22, 23, 24, 25) in order to carry out internal balancing in the compressed gas supply system (34).

10. An electronic device, preferably a control unit (43) of a vehicle, in particular a control unit (43) of a fuel cell vehicle, which is configured to carry out the method according to any one of the preceding claims.

Images