Method and system for filling a fluid container

Abstract

The present invention relates to a method (V) for filling a fluid container (1), in particular a fluid container for a fuel cell, comprising the steps of: providing (V1) a pressure chamber (2) having a pressure chamber internal space (4); arranging (V2) the fluid container (1) inside the pressure chamber internal space (4) such that the volume chamber (3) of the fluid container (1) is fluidically connected to the pressure chamber internal space (4); evacuating (V3) the pressure chamber internal space (4) first of all down to a target negative pressure such that a negative pressure difference is formed in the pressure chamber internal space (4) with respect to the volume chamber (3) for fluid coupling; and filling (V5) the fluid container (1) by introducing a fluid into the volume chamber (3).

Description

[Technical Field]

[0001] The present invention relates to a method for filling a fluid enclosure, particularly a fluid enclosure for operating a hydrogen-operated fuel cell, and to a system for filling a fluid enclosure for operating a hydrogen-operated fuel cell. [Background technology]

[0002] A fuel cell is a galvanic cell that converts the energy of a chemical reaction between a continuously supplied fuel and an oxidant into electrical energy. Thus, a fuel cell is not an energy storage device, but rather an energy converter that is supplied with fuel (energy in a chemically bound form). However, a complete fuel cell system may also include a fuel storage device. Such fuel cells are commonly known and therefore require no further description.

[0003] When such fuel cells are operated, the chemical bond energy of the fuel is directly converted into electricity. Conventional fuel cells use hydrogen as the reactant gas, among other things. Because the chemical purity or concentration of the hydrogen is crucial in this case, fuel cell manufacturers have strict specifications for the purity or concentration of the hydrogen. To achieve these specifications, the hydrogen container is typically first vacuumed to release any gases contained therein, and then filled with hydrogen from a hydrogen tank system.

[0004] For weight reasons, current hydrogen containers are usually made of composite materials and include a core of synthetic material, especially polyamide or polyethylene, with an inner wall layer, the so-called inner liner, which prevents hydrogen from diffusing out of the container. Due to this construction, lightweight containers, especially those made of composite materials, cannot be placed under vacuum without damage, as the inner liner, intended to meet its specified permeability limit, would collapse and be damaged. For this reason, the so-called alternating pressure flushing method is often used for these non-vacuum-compatible containers. In this method, gaseous nitrogen is forced into a sealed container to replace the oxygen in the container. Subsequently, hydrogen is alternately filled in, and the resulting mixture is emptied into the atmosphere. During blowing, the gas previously contained in the container escapes first. The process, consisting of the steps of closing, blowing in, opening, and blowing out, is continued until the desired concentration is reached.

[0005] However, the alternating pressure flushing method has a very long process time due to the multiple steps of completely filling and emptying the tank system with hydrogen, and also involves a large gas consumption since the gas used cannot be recycled or reused since it is contaminated as a result of the nitrogen introduction. Summary of the Invention

[0006] Against this background, it is an object of the present invention to provide an improved method, in particular a method that saves resources.

[0007] This object is achieved according to the present invention by a method having the features of claim 1 and / or by a system having the features of claim 12.

[0008] According to a first aspect of the present invention, there is provided a method for filling a fluid container, in particular a fluid container for operating a hydrogen-powered fuel cell. The method according to the present invention comprises the following steps: providing a pressure chamber having a pressure chamber interior; placing a fluid container inside the pressure chamber interior such that the receiving space of the fluid container is fluidly connected to the pressure chamber interior; evacuating the pressure chamber interior to a target negative pressure such that this fluid coupling creates a negative pressure difference between the pressure chamber interior and the receiving space; and filling the fluid container by introducing a fluid into the receiving space.

[0009] According to a second aspect of the present invention, there is provided a system for filling a fluid container for operating a hydrogen-operated fuel cell, in particular for carrying out the method according to the present invention. The system according to the present invention comprises a pressure chamber having a pressure chamber interior embodied as a fluid-tight seal, and a fluid container, the fluid container being arranged inside the pressure chamber interior and the containing space of the fluid container being fluidly connected to the pressure chamber interior. The system according to the present invention further comprises a compressor device embodied to generate a negative pressure difference inside the pressure chamber relative to the containing space, the system being embodied to carry out the method according to the present invention.

[0010] The idea behind the present invention is to create a controlled, compact atmosphere in which the fluid container is placed, where the pressure can be intentionally controlled and a pressure difference is established between the outside and the inside of the fluid container. This pressure difference is set so as to prevent damage to the inner liner of the fluid container. Advantageously, the fluid container is first evacuated in such a way that a negative pressure difference or underpressure is generated in the space surrounding the fluid container relative to the storage space of the fluid container, causing the fluid located in the storage space to flow into that space. In this case, a negative pressure difference can also be generated in the pressure chamber compared to the ambient atmosphere surrounding the pressure chamber. Subsequently, once a target negative pressure is reached in which the storage space contains a vacuum or only a predetermined acceptable residual substance, the storage space of the fluid container is filled with any uncontaminated fluid as a result of the fluid previously contained in the storage space. According to the present invention, the space surrounding the fluid container is embodied as a pressure chamber, i.e., a closed system with an adjustable pressure ratio. The pressure chamber seals the interior of the pressure chamber airtight, i.e., fluid-tight against the environment.

[0011] Advantageous embodiments and developments are evident from the further dependent claims and also from the description with reference to the figures in the drawings.

[0012] According to one embodiment of the method, the fluid container has an inner liner designed to hermetically seal the fluid container's storage space from its exterior. The inner liner corresponds to the inner layer of the fluid container made of a composite material, in particular a composite gas bottle, and forms a thin-walled barrier layer to reduce gas diffusion through the fluid container's wall. Therefore, it is also possible to use a fluid container material that is not fully hermetic due to its material properties or processing form, but has other suitable properties. For example, the weight of the fluid container can be reduced as a result, or thermal and / or electrical conductivity can be enhanced or reduced. In addition, the inner liner can be equipped with a valve.

[0013] According to a further embodiment, after the exhaust step, the method further includes a step of switching from an exhaust state, in which fluid exchange between the accommodating space of the fluid container and the interior of the pressure chamber, to a filling state, in which fluid exchange between the accommodating space of the fluid container and a fluid tank fluidically connected to the accommodating space, is possible. In this case, it will be clear to those skilled in the art that in each state, fluid exchange according to the other state is prevented. That is, in the exhaust state, fluid exchange between the accommodating space of the fluid container and the interior of the pressure chamber is possible, but fluid exchange between the accommodating space of the fluid container and the fluid tank is not possible. In the filling state, the opposite is consequently true. In this case, the switching can be automated, specifically by a control device, or controlled by a user.

[0014] However, the present invention is not limited to the above-mentioned state, and may include, for example, a transport state in which the storage space is fluidically isolated from the outside. The switching is performed, for example, by a variable multi-port valve fluidly connected to the fluid container.

[0015] According to a further embodiment of the method, fluid exchange between the receiving space of the fluid container and the interior of the pressure chamber is at least temporarily prevented during the evacuation step, thereby temporarily increasing the pressure difference between the receiving space and the interior of the pressure chamber. Fluid exchange can be prevented, for example, by a closing element at the outlet of the fluid container. In this way, damage to the inner liner can be prevented by slowing down pressure changes in the receiving space or maintaining a predetermined minimum pressure difference.

[0016] According to a further embodiment of the method, the target negative pressure is generated by using a compressor device, which is fluidly coupled to the pressure chamber and is embodied to generate a negative pressure difference or negative pressure inside the pressure chamber compared to the ambient atmosphere surrounding the pressure chamber, and which is embodied as a vacuum pump. As a result, evacuation can be performed more reliably within the predetermined process parameters.

[0017] According to a further embodiment, the method further comprises the step of reducing the negative pressure difference inside the pressure chamber compared to the ambient atmosphere surrounding the pressure chamber until the pressure inside the pressure chamber corresponds to the pressure of the ambient atmosphere, thus ensuring that the pressure increase inside the pressure chamber occurs in a controlled manner and that the device placed therein is not damaged.

[0018] According to one development, the step of reducing the negative pressure difference is carried out during the step of filling the fluid container, and the pressure inside the pressure chamber is always at most the pressure of the receiving space. Thus, the method as a whole can be accelerated, since the two steps are carried out in parallel in time.

[0019] According to a further embodiment of the method, the negative pressure difference is corrected in the evacuation step when a target negative pressure of at most 0.5 bar abs is reached, which allows an appropriate vacuum to be created in the receiving space so that residual substances in the receiving space do not interfere with the desired purity of the subsequently filled fluid.

[0020] According to a further embodiment, the method is used for the initial filling of a fluid container. In the case of a fluid container that has already been filled with the same fluid before, the residual overpressure of the fluid container relative to the ambient atmosphere is usually left as it is so that moisture and / or foreign gases do not penetrate into the containing space as a result of the residual overpressure during refilling. This is not the case for a previously unfilled fluid container, which is why such a fluid container may contain moisture and / or foreign gases, generally air, which must first be reduced during the initial filling.

[0021] According to a further embodiment of the method, the fluid is introduced into the accommodating space from a fluid tank containing hydrogen and fluidly connected to the accommodating space. The hydrogen is used as a reactant gas for generating electrical energy, particularly in a fuel cell. In this case, the hydrogen is required to have a purity of at least 99.9% by volume, particularly at least 99.99% by volume.

[0022] According to a further embodiment of the method, the fluid container is a type IV container. Type IV containers are particularly used in fuel cells. These containers are made of, for example, CFRP composite materials, and are therefore lighter than conventional containers made of steel or light metals.

[0023] According to one embodiment of the system, the fluid container has an inner liner embodied to hermetically seal the receiving space of the fluid container from the outside. In this way, the fluid container can be made of a material that is lighter than conventional airtight materials, but does not have the necessary permeability and therefore could not hermetically seal the receiving space without the inner liner.

[0024] According to a further embodiment, the system further includes a fluid tank that can be fluidly connected to the storage space to introduce a fluid into the storage space. The fluid tank can be located either inside or outside the pressure chamber. Additionally, the fluid tank can contain, for example, industrial gases such as acetylene, argon, hydrocarbons, oxygen, nitrogen, hydrogen, or carbon dioxide, compressed air, or similar fluids, which can be contained in the fluid tank in gaseous and / or liquid condensed states. Therefore, the fluid tank can have an insulating device and / or a cooling device depending on the appropriate storage conditions of the fluid.

[0025] According to a further development, the system further comprises a variable multiport valve fluidly connected to the fluid container and configured to switch from an exhaust state, in which fluid exchange between the accommodating space of the fluid container and the interior of the pressure chamber, is possible, to a filling state, in which fluid exchange between the accommodating space of the fluid container and the fluid tank is possible. In this case, the multiport valve in each state prevents fluid exchange in each other state. That is, in the exhaust state, fluid exchange between the accommodating space of the fluid container and the interior of the pressure chamber is possible, but fluid exchange between the accommodating space of the fluid container and the fluid tank is prevented. In the filling state, the opposite is consequently true. In this case, as an example, the variable multiport valve can be electronically coupled to the control device.

[0026] However, the present invention is not limited to multiport valves that are only capable of setting the above-mentioned states, but rather the multiport valve may also include further settings, for example, where the receiving space is fluidly isolated from the outside and / or is provided with a pressure sensor.

[0027] Additionally, the interior of the pressure chamber is dimensioned so that, for example, a person can enter it through a lockable door and stand upright within it.

[0028] In addition, the pressure chamber can optionally have connections and / or electronic coupling devices for fluidly connecting the interior of the pressure chamber to the environment, whereby, for example, devices arranged inside the pressure chamber can be controlled / energized from the outside. As a result, the pressure chamber can be compactly dimensioned, since in particular supply devices such as fluid tanks, control devices, etc. can be provided outside the pressure chamber and nevertheless be led inside the pressure chamber, which is closed during operation. However, in any case, the supply devices mentioned above by way of example can also be arranged inside the pressure chamber.

[0029] The fluid containers can be selectively placed inside the pressure chamber either manually, automatically, or semi-automatically. For example, one or more fluid containers can be stored on a transport device and transported inside the pressure chamber using the transport device.

[0030] If multiple fluid containers are arranged inside the pressure chamber, their storage spaces can in each case be fluidly connected to the pressure chamber interior independently of one another or at least partially together. The fluid connection between the storage spaces and the pressure chamber interior can be provided, for example, via a hose line arrangement, the hose of which is particularly embodied as a dimensionally stable hose. Alternatively or additionally, the fluid connection can be provided via a pipeline system. A negative pressure difference or underpressure in the pressure chamber interior relative to the storage space causes the fluid to flow from the storage space to the pressure chamber interior. Since the storage space does not have a fluid inlet, the storage space is evacuated as long as the underpressure difference remains.

[0031] The target negative pressure is measured, for example, by a barometer, specifically a digital barometer, a mercury barometer, a tube barometer, etc. The measurement is selectively displayed graphically, textually, or in a mixed form. Additionally, the barometer may be electronically coupled to the controller and transmit the measurement to the controller for monitoring / adjusting the target negative pressure.

[0032] Where possible, the above-described embodiments and developments can be combined with one another as desired.

[0033] Further possible embodiments, developments and implementations of the invention also include combinations not explicitly mentioned of the features of the invention that are explained above or below with reference to the exemplary embodiments, in particular those skilled in the art will add individual aspects as improvements or additions to the respective basic form of the invention.

[0034] The invention will now be explained in more detail with reference to exemplary embodiments shown in the schematic diagrams of the drawings. [Brief explanation of the drawings]

[0035] [Figure 1] 1 illustrates a flowchart of a method for filling a fluid container, according to an illustrative embodiment. [Figure 2]1 shows a schematic diagram of a system for filling a fluid container, according to a further exemplary embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0036] The accompanying drawings are intended to provide a further understanding of embodiments of the present invention. They illustrate embodiments and are used in conjunction with the description to explain the principles and concepts of the present invention. Other embodiments and many of the advantages mentioned arise with reference to the drawings. Elements of the drawings are not necessarily shown to scale relative to each other.

[0037] In the figures of the drawings, identical, functionally identical and identically acting elements, features and components are in each case given the same reference characters unless otherwise stated.

[0038] The term pressure in the sense of the present invention means absolute pressure, which by definition is the pressure relative to zero pressure in empty space / vacuum.

[0039] In the context of the present invention, the inner liner is the core of the fluid container, which forms the inner barrier layer of the fluid container and is made of a composite material, in particular to ensure a specific permeability of the fluid container and to provide airtightness. Materials such as steel, stainless steel, aluminum or plastic are used for this thin barrier layer.

[0040] A vacuum in the sense of the present invention is a gas-filled (air-filled) space in which the pressure is lower than that of the surrounding atmosphere. The following applies: the fewer atoms present in a confined space, the purer the vacuum. It is not possible to generate a completely pure vacuum on Earth using the technical means available to date. Depending on the pressure level, a distinction is made between rough vacuum, fine vacuum, high vacuum and ultra-high vacuum (maximum vacuum).

[0041] 1 shows a flow chart of a method V for filling a fluid container 1. This method V is used, for example, for the initial filling of the fluid container 1.

[0042] 1 is a so-called type IV container made of a composite material used in fuel cells, and has an inner liner that hermetically seals the storage space 3 of the fluid container 1 from the outside.

[0043] According to the invention, the method V comprises a step V1 of providing a pressure chamber 2 having a pressure chamber interior 4. In an exemplary manner, the pressure chamber 2 essentially corresponds to a so-called vacuum chamber with a closable access door. Optionally, the pressure chamber 2 may also have several access doors or openings. Such a pressure chamber 2 may furthermore be embodied as being essentially curved, so as to advantageously be able to withstand mechanical loads resulting from a pressure difference with respect to the ambient atmosphere. However, this does not exclude regions of the pressure chamber 2 being embodied as linear sections. In this case, the pressure chamber interior 4 has a height of approximately 2 m to approximately 4 m, and may be embodied as a height of 5 m. 2 ~200m 2 range, especially 10m 2 ~100m 2 It has a base area in the range of

[0044] Furthermore, the method V includes a step V2 of placing the fluid container 1 inside the pressure chamber interior 4 such that the receiving space 3 of the fluid container 1 is fluidly connected to the pressure chamber interior 4. The fluid container 1 is, for example, in this case, placed on a transport trolley having rollers. Thus, the transport trolley can be conveniently pushed into the pressure chamber interior 4 from the outside while the fluid container 1 is placed on the transport trolley. In addition, a variable multi-port valve 7 is fixed to the fluid container 1 in an exemplary manner.

[0045] The method V further comprises a step V3 of evacuating the pressure chamber 4 to a target negative pressure. The evacuation V3 is performed in this case so that a negative pressure difference is initially generated in the pressure chamber 4 relative to the accommodation space 3 by fluid coupling. The desired target negative pressure is generated, for example, by using a compressor device 6, which is preferably embodied as a vacuum pump. According to the example of FIG. 1, the evacuation step V3 is performed / maintained until the desired target negative pressure of up to 0.5 bar abs, in particular in the range of 0.48 bar abs to 0.4 bar abs, is reached. Once the desired target negative pressure is reached, the discharge rate of the compressor device 6 is adjusted so that the negative pressure difference in the pressure chamber 4 relative to the accommodation space 3 is further corrected.

[0046] Also, for example, at the start of the exhaust step V3, fluid exchange between the accommodation space 3 of the fluid container 1 and the pressure chamber interior 4 is not possible. As a result, in the initial stage of the exhaust step V3, the pressure difference between the accommodation space 3 and the pressure chamber interior 4 is large. This makes it possible to apply internal pressure to the inner liner at an early stage, and furthermore, by measuring and monitoring the internal pressure in the accommodation space 3, it is possible to perform a leak test on the inner liner.

[0047] 1 further comprises, after the evacuation step V3, an optional step V4 of switching from an evacuation state, in which fluid exchange is possible between the accommodating space 3 of the fluid container 1 and the pressure chamber interior 4, to a filling state, in which fluid exchange is possible between the accommodating space 3 of the fluid container 1 and a fluid tank 5 fluidly connected to the accommodating space. For example, a control device controls the switching V4, which control device particularly uses for this purpose the pressure in the pressure chamber interior 4 and the pressure in the accommodating space 3. In this case, the control device e.g. sends a corresponding control signal to the variable multiport valve 7 in a wired and / or wireless manner.

[0048] Method V also includes step V5 of filling fluid container 1 by introducing a fluid into accommodating space 3. For example, the fluid is hydrogen having a purity of at least 99.99% by volume, which is introduced into accommodating space 3 from a fluid tank 5 fluidly connected to accommodating space 3.

[0049] Method V optionally further comprises step V6 of reducing the negative pressure difference inside pressure chamber 4 compared to the ambient atmosphere surrounding pressure chamber 2 until the pressure inside pressure chamber 4 corresponds to the pressure of the ambient atmosphere. Specifically, step V6 of reducing the negative pressure difference is performed during step V5 of filling fluid container 1. In this case, the pressure inside pressure chamber 4 always includes at most the pressure of the containing space 3, thereby avoiding damage to the inner liner.

[0050] FIG. 2 shows in an exemplary manner a schematic diagram of a system 10 for filling a fluid container 1 .

[0051] In accordance with the present invention, system 10 comprises a fluid container 1, a pressure chamber 2, and a compressor device 6. Additionally, system 10 shown in an exemplary manner includes an optional fluid tank 5 and an optional variable multi-port valve 7.

[0052] The pressure chamber 2 includes a pressure chamber interior 4 that is embodied to be fluid-tight. In an exemplary manner, the pressure chamber 2 is embodied as essentially cylindrical. The pressure chamber 2 further has at least one access door. In this case, the pressure chamber interior 4 has an internal height of about 2 m to about 4 m, and a width of 5 m. 2 ~200m 2 range, especially 10m 2 ~100m 2 In addition, the pressure chamber 2 according to the example of FIG. 2 can be combined with the features of the pressure chamber 2 according to the example of FIG.

[0053] The fluid container 1 is disposed inside the pressure chamber 4. The containing space 3 of the fluid container 1 can be fluidly connected to the pressure chamber 4. In one example, the fluid container 1 has an outlet opening 8 that extends into the pressure chamber 4 and can be closed. In the example of FIG. 2, the fluid container 1 is made of steel or a steel alloy.

[0054] The compressor device 6 is, for example, arranged outside the pressure chamber 2 and fluidly coupled to the pressure chamber 2. The compressor device 6 is further configured to generate a negative pressure difference in the pressure chamber interior 4 relative to the accommodating space 3. Alternatively or additionally, the compressor device 6 is configured to generate a negative pressure in the pressure chamber interior 4 compared to the ambient atmosphere surrounding the pressure chamber 2.

[0055] The fluid tank 5 may, for example, be arranged outside the pressure chamber 2 and fluidly connected to the accommodating space 2. In this case, the fluid tank 5 is, for example, fluidly connected to the accommodating space 3 via a hose line arrangement 9, the hose of which is, for example, embodied as a dimensionally stable hose. Alternatively or additionally, the fluid tank 5 may be connected to the accommodating space 3 via a pipeline system. Furthermore, the fluid tank 5 is embodied to introduce a fluid into the accommodating space 3.

[0056] 2, the variable multiport valve 7 is, by way of example, fluidly connected to multiple fluid containers 1 and can be switched between an exhaust state and a filling state. In the exhaust state, fluid exchange is possible between the storage space 3 of the fluid container 1 and the pressure chamber interior 4. In the filling state, fluid exchange is possible between the storage space 3 of the fluid container 1 and the fluid tank 5.

[0057] By way of example, the fluid is liquid hydrogen, which is stored in the fluid tank 5 at approximately 200 bar to 300 bar, and in a filled state, the liquid container 1 has a direction of flow into the storage space 3 as a result of the pressure difference relative to the storage space 3.

[0058] In accordance with the present invention, the system 10 shown in FIG. 2 is embodied to perform method V according to the example of FIG. 1, or to perform according to method V, which is not described in detail but includes at least the essential method features of the present invention.

[0059] Although the present invention has been fully described above based on preferred exemplary embodiments, it is not limited thereto and can be modified in various ways. [Explanation of symbols]

[0060] 1 Fluid container 2. Pressure chamber 3. Containment space 4. Inside the pressure chamber 5 Fluid Tanks 6 Compressor unit 7 Multiport valve 8 outlet opening 9 Hose line device 10 Systems V method V1 Provide V2 Place V3 Exhaust V4 Switch V5 Fill V6 Reduce

Claims

1. A method (V) for filling a fluid container (1), comprising: a step (V1) of providing a pressure chamber (2) having a pressure chamber interior (4); a step (V2) of placing the fluid container (1) inside the pressure chamber interior (4) such that the receiving space (3) of the fluid container (1) is fluidly connected to the pressure chamber interior (4); a step (V3) of evacuating the pressure chamber interior (4) to a target negative pressure so that a negative pressure difference is first generated in the pressure chamber interior (4) relative to the accommodation space (3) by fluid coupling, wherein during the evacuating step (V3), fluid exchange between the accommodation space (3) of the fluid container (1) and the pressure chamber interior (4) is at least temporarily prevented so that the pressure difference between the accommodation space (3) and the pressure chamber interior (4) temporarily increases; a step (V4) of switching from an exhaust state in which fluid exchange between the accommodating space (3) of the fluid container (1) and the inside of the pressure chamber (4) is possible to a filling state in which fluid exchange between the accommodating space (3) of the fluid container (1) and a fluid tank (5) fluidly connected to the accommodating space is possible; and a step (V5) of filling the fluid container (1) by introducing a fluid into the receiving space (3).

2. 2. The method according to claim 1, characterized in that the fluid container (1) comprises an inner liner embodied to hermetically seal the receiving space (3) of the fluid container (1) against its exterior.

3. 3. The method according to claim 1 or 2, characterized in that the target negative pressure is generated by means of a compressor device (6).

4. Further steps, namely:

3. The method according to claim 1 or 2, characterized by a step (V6) of reducing the negative pressure difference inside the pressure chamber (4) compared to the ambient atmosphere surrounding the pressure chamber (2) until the pressure inside the pressure chamber (4) corresponds to the pressure of the ambient atmosphere.

5. 5. The method according to claim 4, characterized in that the step (V6) of reducing the negative pressure difference is performed during the step (V5) of filling the fluid container (1), and the pressure inside the pressure chamber (4) always includes at most the pressure of the accommodating space (3).

6. 3. The method according to claim 1 or 2, characterized in that the negative pressure difference is corrected in the evacuating step (V3) when the target negative pressure of at most 0.5 bar abs is reached.

7. 3. The method according to claim 1 or 2, characterized in that the method (V) is used for the initial filling of the fluid container (1).

8. 3. The method according to claim 1 or claim 2, characterized in that the fluid contains hydrogen and is introduced into the accommodating space (3) from a fluid tank (5) fluidly connected to the accommodating space (3).

9. 3. The method according to claim 1 or claim 2, characterized in that the fluid container (1) is a type IV container.

10. A system (10) for filling a fluid container for operating a hydrogen-operated fuel cell, comprising: a pressure chamber (2) including a fluid-tight pressure chamber interior (4); a fluid container (1) disposed inside the pressure chamber (4), and an accommodating space (3) of the fluid container (1) being fluidically connected to the pressure chamber (4); a compressor device (6) configured to generate a negative pressure difference between the storage space (3) and the pressure chamber (4), a fluid tank (5) fluidly connectable to the receiving space (3) for introducing a fluid into the receiving space (3); The system is provided with a variable multi-port valve (7) that is fluidly connected to the fluid container (1) and is configured to switch from an exhaust state in which fluid exchange is possible between the accommodating space (3) of the fluid container (1) and the inside of the pressure chamber (4) to a filling state in which fluid exchange is possible between the accommodating space (3) of the fluid container (1) and the fluid tank (5).

11. 11. The system according to claim 10, characterized in that the fluid container (1) comprises an inner liner embodied to hermetically seal the receiving space (3) of the fluid container (1) against its exterior.

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