DE102021104334A1 - Connection element, pressure vessel assembly and motor vehicle - Google Patents

Abstract

According to the invention, the technology disclosed here relates to a connection element 30 for a pressure vessel 20, with two line connections 31, 32 being present at the same distance from a connecting means 25 in order to enable connection lines 50, 60 to be routed in a straight line. The technology disclosed here also relates to a pressure vessel assembly 10 with alternatingly arranged connection elements 30. The technology disclosed here also relates to a motor vehicle having at least one such pressure vessel assembly 10.

Description

The technology disclosed here relates to a connection element for a pressure vessel, a pressure vessel assembly and a motor vehicle with such a pressure vessel assembly.

Pressure vessels are typically used to store gaseous fuel in automobiles and other mobile units. Pressure vessels can be combined in pressure vessel assemblies, which can be installed in suitable installation spaces. Such a pressure vessel assembly typically includes multiple pressure vessels. Optimizing pressure vessel assemblies to criteria such as fire safety and compactness has been shown to make sense for use in automobiles or other units.

It is a preferred object of the technology disclosed herein to mitigate or obviate at least one disadvantage of a previously known solution or to propose an alternative solution. In particular, it is a preferred object of the technology disclosed herein to provide a connector for a simpler construction and/or an optimized pressure vessel assembly. Further advantageous objects can arise from the beneficial effects of the technology disclosed herein. The objects are solved by the subject matter of the independent patent claims. The dependent claims represent preferred embodiments.

The technology disclosed here relates to a connection element for a pressure vessel, comprising (i) a first line connection for a connection line, (ii) a second line connection for a connection line, (iii) a connecting means for mechanical connection to a pressure vessel, and (iv) a container connection , which is fluidly connected to an interior of the pressure vessel when the connecting means is connected to a pressure vessel. The first line connection, the second line connection and the container connection are fluidically connected to one another within the connection element. The first line connection and the second line connection are expediently at the same distance from the connecting means.

By means of such a connecting element, it is possible to provide a rectilinear connection of a plurality of pressure vessels arranged parallel to one another in that respective sections of connecting lines are connected between the connecting elements. This allows a particularly simple and also compact design.

The connection element can in particular be an element which is fastened to a pressure vessel with its connecting means. For example, this can be a screw connection, i.e. the connection element or a part of it is screwed onto the pressure vessel, with a mechanical connection being formed. The mechanical connection can thus also be referred to as attachment. The container connection is in particular the connection which establishes a fluidic connection to the interior of the pressure container. The line connectors fluidly connect to the respective port lines when the port lines are connected thereto. According to a simple embodiment, the line connections and the container connection can be connected to one another within the connection element without any further components in between. In particular, they can be connected to one another without a valve, so that there is no element that regulates or significantly impedes the flow between the line connections and the container connection. This can be used, for example, in an embodiment in which a common tank shut-off valve is used for several pressure vessels. However, there can also be other elements between the line connections and the container connection and/or between the line connections, for example controllable valves or non-return valves, which will be discussed in more detail below. In particular, the two line connections can be fluidically connected to one another directly and/or without a valve.

By using the same spacing of connecting means, the first line connection and the second line connection are designed in such a way that several pressure vessels arranged next to one another, of the same type and arranged along a line can be connected to one another with connection lines which lie together on a straight line. In particular, the line connections can point to the side for this purpose, ie in particular rotated by 90° with respect to the container connection and/or a pressure container longitudinal axis of a connected pressure container. A distance from the next point on the connecting means can be defined as the distance from the connecting means, for example, points along the circumference of a screw connection being able to be used, for example. For example, the distance from the first line connection to the connection means can be measured at the point on the connection means that is closest to the first line connection, and the distance from the second line connection to the connection means can be measured at the point of the connection means the one closest to the second line connection. However, a distance to a central point of the connecting means can also be measured.

The first line connection and the second line connection are preferably at the same distance from the pressure vessel when the connecting means is connected to a pressure vessel. This can also ensure in a preferred manner that a straight connection is possible by means of connecting lines lying along a straight line. The distance can be measured in particular along a longitudinal axis of the pressure vessel.

The first line connection and the second line connection can in particular be arranged opposite one another on the connection element. In particular, they can be offset from one another by 180° with respect to a longitudinal axis, which can be identical to an axis of the container connection, for example.

The first line connection and the second line connection can in particular be connected to one another in a straight line. This allows a particularly low-resistance flow of gaseous fuel between the two line connections. However, other designs are also possible here.

The connecting means can in particular be designed as a thread or have a thread. This allows the connection element to be screwed or screwed onto a pressure vessel, which enables a simple and reliable connection to a pressure vessel.

A connection between the first line connection and the second line connection can in particular have a larger cross section than a connection between the line connections and the container connection. As a result, the cross-section between the line connections is increased even further, and the resistance to gaseous fuel flowing through is further reduced. This enables even more efficient refueling and extraction of gaseous fuel.

The connection element can in particular have a tank shut-off valve which is fluidically connected between the line connections and the container connection. The tank shut-off valve can in particular be electrically and/or mechanically switchable so that the connection can be released and interrupted in a controlled manner.

The connecting element can have a non-return valve which is fluidically connected between the line connections and the container connection and whose passage direction points towards the container connection. This can function as a refueling valve, since in the event of excess pressure in the connecting lines, pressure equalization to the pressure vessel is automatically made possible, so that refueling takes place. Pressure fluctuations can also be automatically compensated for in this way.

The connection element can have a thermal pressure relief device which is fluidically connected to the container connection. As a result, gaseous fuel can be automatically discharged from the interior of the pressure vessel in the event that the temperature is too high, in particular due to a fire. This can increase security.

According to a further, fundamentally functionally independent aspect, the technology disclosed here relates to a pressure vessel assembly comprising a plurality of pressure vessels which are arranged parallel to one another. Each pressure vessel has a connection element at one longitudinal end. The connection elements are arranged on all or at least some of the pressure vessels at alternating longitudinal ends.

By means of such a pressure vessel assembly, for example, the accessibility of the connection elements can be improved. Other advantages can also be achieved, which will be discussed in more detail below.

The parallelism of the pressure vessels can relate in particular to their longitudinal axes. The connection elements can be designed, for example, as described herein with reference to a connection element. However, the connecting elements can also be designed in other ways.

An alternating arrangement of the connecting elements is understood to mean in particular that in the case of a pressure vessel the connecting element is arranged on a longitudinal end pointing in one direction and in the case of an immediately adjacent pressure vessel the connecting element is arranged on a longitudinal end pointing in another direction, etc. The two directions can in particular be opposite to each other by 180°.

Particularly preferably, the connection elements can be arranged alternately in all pressure vessels, which means in particular that the connection element is always arranged on the same longitudinal end in the next but one pressure vessel.

The pressure vessel assembly can in particular have a first connecting line and a second connecting line, the first connecting line connecting connecting elements at first longitudinal ends of the pressure vessels and the second connecting line connecting connecting elements at second longitudinal ends of the pressure vessels. The second longitudinal ends are in particular arranged opposite to the first longitudinal ends. By using two such separate connection lines, the mass flow can be distributed over two connection lines, so that an even better flow is possible. In particular, the connection line can be a line that is used both for refueling and for removal. In principle, however, two such connecting lines can also be present on each side if separate refueling and removal lines are to be used.

The connection elements can be designed in particular for the direct fluidic connection of the connection lines with interior spaces of the pressure vessels. A direct fluidic connection can mean, in particular, that there is no element that regulates or significantly impedes the flow between the connection line and the interior of the pressure vessel. This can be used particularly advantageously if a common tank shut-off valve is to be used for a number of pressure vessels or also for all pressure vessels.

The pressure vessel assembly can in particular have one or more common tank shut-off valves and/or one or more check valves with the passage direction directed toward the interior of the pressure vessel, which are fluidically connected to a number of pressure vessels via at least one connecting line. This makes it possible to use a common tank shut-off valve and/or a common non-return valve for refuelling, with the effort being able to be saved.

According to one embodiment, a tank shut-off valve and/or a non-return valve is arranged in each connection element with the passage direction directed toward the interior of the pressure vessel, which is fluidically connected between the interior of the pressure vessel and the connection line. As a result, an embodiment can be realized in which no common tank shut-off valve and/or no common check valve is used for refueling, but corresponding valves are provided separately for each pressure vessel.

The first connection line and the second connection line can be fluidically connected to one another, in particular at one or two connection points. A connection point is basically sufficient to ensure a sufficient fluid flow, so that, for example, mass flows can be combined and/or separated at this connection point. The use of a second connection point makes it possible to design the two connection lines in a continuous annular manner in terms of fluidity, which enables even better pressure equalization. For example, one can speak of a bypass with regard to a section that connects one of the connection lines to the second connection point and would not be absolutely necessary for pressure equalization, but improves the mass flow.

The pressure vessels can have a pressure relief device, in particular at a longitudinal end opposite the connection element. This can increase security. In particular, it can be a thermal pressure relief device. By arranging the pressure relief device opposite to the connection element, a particularly compact design can be achieved since the pressure relief device does not have to be accommodated in the connection element. Due to the alternating arrangement of the connection elements, the pressure relief devices are also arranged alternately in this design. This makes it possible for respective pressure relief devices to be present on both sides or on both longitudinal ends, which are triggered, for example, in the event of a fire. So if a fire slowly spreads over the expansion of the pressure vessel assembly, there are respective pressure relief devices on both longitudinal ends of the pressure vessel, which are triggered and thus ensure that gaseous fuel is released in good time. Any cooling effect due to escaping gaseous fuel, for example hydrogen, will have a lesser effect due to the greater distance between the pressure relief devices. This leads to a faster triggering of the pressure relief devices and thus to an increase in safety.

The technology disclosed herein further relates to a motor vehicle comprising at least one pressure vessel assembly as described herein. With regard to the pressure vessel assembly, all of the versions described herein can be used.

A pressure vessel or a pressure vessel system as described herein can be used in particular for a motor vehicle (for example passenger cars, motorcycles, commercial vehicles). The pressure vessel assembly is used for storage of fuel which is gaseous under ambient conditions. The pressure vessel assembly can be used, for example, in a motor vehicle that is operated with compressed (also called Compressed Natural Gas or CNG) or liquefied (also called Liquid Natural Gas or LNG) natural gas or with hydrogen. The pressure vessel assembly is typically fluidly connected to at least one energy converter, such as a fuel cell or gas powered internal combustion engine, configured to convert the chemical energy of the fuel into other forms of energy.

Such a pressure vessel assembly comprises a plurality of pressure vessels, in particular designed as a composite overwrapped pressure vessel. The pressure vessel can be, for example, a cryogenic pressure vessel or a high-pressure gas vessel. High-pressure gas tanks are designed to permanently store fuel at ambient temperatures at a nominal operating pressure (also known as nominal working pressure or NWP) of at least 350 bar overpressure (= excess pressure compared to atmospheric pressure) or at least 700 bar overpressure. A cryogenic pressure vessel is suitable for storing the fuel at the aforementioned operating pressures even at temperatures that are significantly (for example more than 50 K or more than 100 K) below the operating temperature of the motor vehicle.

In particular, the pressure vessel assembly can combine several pressure vessels. You can form these with supporting, fastening and/or protective elements (e.g. protective shields, shields, barrier layers, covers, coatings, wrappings, etc.) into a permanently connected unit that can be installed in the underfloor area below the passenger compartment in particular. The longitudinal axes of the pressure vessels can run parallel to one another in the installed position and/or individual pressure vessels can each have a length-to-diameter ratio of between 4 and 200, preferably between 5 and 100, and particularly preferably between 6 and 50.

A tank shut-off valve can in particular be an electrically actuable and normally closed shut-off valve which is set up in particular to shut off the pressure vessel assembly or a distributor pipe from the other fuel-carrying lines of a fuel supply system leading to the energy converter. This shut-off valve has the function of an on-tank valve of a conventional pressure vessel. Only one normally closed shut-off valve is expediently provided. In Regulation (EU) No. 406/2010 of the Commission of April 26, 2010 for the implementation of Regulation (EC) No. 79/2009 of the European Parliament and Council on the type approval of hydrogen-powered motor vehicles, such a tank shut-off valve is also referred to as the first valve.

Generally, depressurization is the act of reducing the pressure in a pressure vessel as a result of an event. In particular, the event is not the intended removal to supply an energy converter, but in particular an accident. The pressure relief usually begins with the at least partial opening of a valve and/or a bursting element which is directly fluidly connected to the pressure vessel.

The pressure relief can preferably be done by at least one pressure relief device. If an incident occurs due to a malfunction of another component and/or due to an external thermal and/or mechanical effect (e.g. accident, local flame, etc.), the pressure relief device is set up to reduce the pressure in the pressure vessel system, in particular in at least one pressure vessel to reduce. The pressure relief device is fluidly connected to the at least one pressure vessel. The pressure relief device can expediently be set up to allow a fuel withdrawal mass flow for the pressure relief of the pressure vessel which is greater (for example at least by a factor of 1.5, 2, 5, 10, 100 or higher) than the maximum fuel withdrawal mass flow through the withdrawal path to at least one Energy converter (usually through a tank shut-off valve). The at least one pressure relief device is generally not used for filling the pressure vessel system and/or for removing fuel to provide energy in the motor vehicle during operation without a malfunction.

The pressure relief device can in particular be a thermally activatable pressure relief device. The thermally activatable pressure relief device, also called Thermal Pressure Relief Device (=TPRD) or thermal fuse, is usually provided adjacent to the pressure vessel. When exposed to heat (e.g. from flames), the TPRD releases the fuel stored in the pressure vessel into the environment. The pressure relief device releases the fuel as soon as the trigger temperature of the TPRD is exceeded (= is thermally activated). It can also be provided trigger lines. Such a system for thermal pressure relief is for example in the German patent application with the publication number DE 10 2015 222 252 A1 shown.

In other words, changing the layout to alternate side orientation of the tank valves can result in TPRDs being located on both sides of the flat accumulator. If the scenario of a slow fire starting on one side of a flat storage tank occurs, the TPRDs on the side that burned first will trigger. The escaping hydrogen ignites and burns, which leads to a significantly increased speed of spread of the fire. The area around the TPRDs on the respective other side is thus ignited earlier and these are therefore also triggered earlier than would be the case with a structure according to the prior art. This typically represents an optimization with regard to the design case "slow fire spread". Another advantage is that the hydrogen flowing out of a TPRD cools its immediate surroundings (expansion cooling). The directly adjacent TPRD that would be affected is on the opposite side in this setup. The effect will not take effect for this TPRD. The structure can be used for tanks installed both lengthwise and crosswise in the vehicle.

Another aspect is described below, which is functionally independent of the other aspects, but can be combined with them. This relates to a breakaway coupling that can be installed in a pipe, connecting line or other line that carries gaseous fuel. The function of the breakaway coupling can correspond in particular to a check valve or a valve which is pressed open and kept open when a line is screwed on or when a line is otherwise fastened. For example, with a correspondingly robust design of the connecting lines and elements as well as the tank-side components, the breakaway coupling is designed as a predetermined breaking point and can fail, for example, when external forces act in front of the connecting line or connecting line. As a result, the non-return valve or valve is no longer kept open and automatically closes the remaining part of a line, which can lead to a pressure vessel, for example. As a result, compressed gas can no longer escape from the container, for example.

Depending on the structure of a tank assembly or a pressure tank assembly, a two-sided breakaway coupling can also be installed, which also prevents gas from escaping from the otherwise open line section. Thus, if the breakaway coupling breaks off, a line can be closed at both points. Alternatively, it is also possible, for example, to install classic non-return valves at suitable points in a container assembly or a pressure container assembly.

With such a breakaway coupling, the installation of pipe rupture protection in the form of an excessive flow valve (EFV) can be avoided. If a thermal pressure relief device is triggered due to a mass flow that is then too high, this would prevent other pressure vessels from being emptied than the pressure vessel on which the triggering thermal pressure relief device is installed. By doing without such an excessive flow valve, the shared use of thermal pressure relief devices for a plurality of pressure vessels and/or a related redundancy can be ensured. As already mentioned, the breakaway coupling only triggers if the line breaks, but not at a very high mass flow.

• 1: eine Druckbehälterbaugruppe,
• 2: ein Anschlusselement,
• 3: eine weitere Druckbehälterbaugruppe,
• 4: ein weiteres Anschlusselement, und
• 5: noch ein weiteres Anschlusselement.

The technology disclosed here will now be described with reference to the figures. show:

• 1 : a pressure vessel assembly,
• 2 : a connecting element,
• 3 : another pressure vessel assembly,
• 4 : another connecting element, and
• 5 : yet another connecting element.

1 shows purely schematically a pressure vessel assembly 10 according to an embodiment. In the present case, the pressure vessel assembly 10 has seven pressure vessels 20 arranged next to one another, these pressure vessels 20 being arranged directly adjacent to one another and with parallel longitudinal axes.

Each pressure vessel 20 has a first longitudinal end 21 and a second longitudinal end 22 . The first longitudinal ends 21 are in the plane of the paper 1 arranged on top and lie side by side. The second longitudinal ends 22 are in the plane of the paper 1 arranged at the bottom and are also next to each other. As shown, the pressure vessels 20 are alternately slightly offset from one another, with a uniform arrangement with longitudinal ends 21, 22 lying on a respective line also being possible.

A respective connection element 30 is arranged at the top at the longitudinal end 21 of each second pressure vessel 20 . A thermal pressure relief device 40 is arranged at each opposite longitudinal end 22 . The same applies to the second longitudinal ends 22, a respective connecting element 30 and a thermal pressure relief device 40 being arranged opposite each other on the underside of each second pressure vessel 20 as well. The connection elements 30 located at the top are connected to a first connection line 50 . The below lie ing connecting elements 30 are connected to a second connecting line 60 . The second connection line 60 is connected to the first connection line 50 at a first connection point 51 and a second connection point 52 . The second connection line 60 is thus designed in such a way that it forms a ring circuit together with part of the first connection line 50 . For this purpose, the second connection line 60 has a bypass section 65, which is shown in dashed lines. This bypass section 65 is not absolutely necessary for the pure functionality since pressure equalization is also possible without this bypass section 65 . However, it improves the flow and thus ensures better functionality.

At the in 1 In the embodiment shown, for example, each connection element 30 can be designed as shown in FIG 2 is shown. Each connection element 30 has a line connection 31 for connecting the connection line 50 , 60 . Starting from this line connection 31, the circuit branches internally to a tank shut-off valve 34 and a check valve 35. The tank shut-off valve 34 can be switched electrically, so that a flow can be selectively released or blocked. In particular, this enables gaseous fuel to be removed from the respective pressure vessel 20. The non-return valve 35 opens automatically when the pressure in the connection line 50, 60 is higher than that in the interior of the pressure vessel 20. This is particularly relevant for refueling processes, as this makes it easier Way gaseous fuel can flow into the pressure vessel 20.

The connecting element 30 also has a thermal pressure relief device 36 which is connected to a relief outlet 37 . In particular, the relief outlet 37 may be routed down the vehicle where escaping gaseous fuel is typically best vented.

In such an embodiment, each pressure vessel 20 has two pressure relief devices 40, 36, which can thus ensure a particularly high level of safety. However, one of these two pressure relief devices can also be dispensed with, for example, so that only one pressure relief device per pressure container 20 is used.

The first connection line 50 can in the case of the execution of 1 for example lead directly to a pressure reducer and / or a consumer for the gaseous fuel. Additional valves are no longer required here.

3 shows a pressure vessel group 10 according to a second embodiment. In contrast to the execution of 1 connection elements 30 are used, which have no independent functionality, but merely connect the respective connection line 50, 60 to the interior of the pressure vessel 20, without an element controlling or significantly limiting the flow being present. Accordingly, a common check valve 70 and a common tank shut-off valve 75 are present in this embodiment. These are connected to the first connecting line 50 and enable joint refueling and removal of gaseous fuel from the pressure vessels 20.

Also in contrast to 1 20 respective temperature sensors 45 are arranged within the pressure vessel. The temperature inside the respective pressure vessel 20 can thus be measured. This feature is functionally independent and can also be used in other designs.

Also in contrast to the execution of 1 the connecting lines 50, 60 are subdivided and only extend between the connecting elements 30 from one connecting element 30 to the next connecting element 30. In other words, the fluid flows of the connecting lines 50, 60 partially pass through the connecting elements 30. The connection lines 50, 60 can thus be carried out straight and do not need as in the execution of 1 respective terminals pointing away from the terminal members 30. As a result, a particularly simple and compact design can be achieved.

4 shows a connecting element 30 which can be used with such a straight design of connecting lines. As shown, this also has a second line connection 32 in addition to a first line connection 31 . A first connection line piece 55 is schematically connected to the first line connection 31 . A second connection line piece 56 is also connected to the second line connection 32 . The first and second connecting line pieces 55, 56 are shown in FIG 3 Part of the first connection line 50.

Regarding the tank shut-off valve 34, the check valve 35, the thermal pressure relief device 36 and the relief outlet 37, refer to the description of FIG 2 referred. An excessive flow valve 38 and a filter 39 are also present. Furthermore, in front of the container connection 33 there is also a manually operated connected bare valve 41, with which a shutdown, for example, for service, assembly or decommissioning is possible.

The connection element 30 also has a connecting means 25 which is arranged surrounding the container connection 33 . The connecting means 25 is only shown schematically here and is designed as a ring, for example, which has an internal thread. This internal thread is not shown, but can be used to screw the connection element 30 onto a pressure vessel 20 .

As shown, the first line connection 31 and the second line connection 32 are at the same distance from the connecting means 25. This enables the straight design of the connection lines 50, 60 already described.

5 shows a connection element 30 according to a further embodiment. Most of the in 4 components shown are dispensed with, so that the connecting element 30 is considerably simplified. Only a thermal pressure relief device 36 and the associated relief outlet 37 are present. A temperature sensor 45 is also located towards the interior of the pressure vessel 20.

When executing 5 the two line connections 31, 32 and the container connection 33 are directly fluidly connected to one another. There is no valve or other element controlling or significantly impeding the flow. As a result, this version is particularly suitable for the in 3 Illustrated embodiment of a pressure vessel assembly 10 in which common refueling and tank isolation valves are used. However, a combination of such designs is also possible.

For reasons of legibility, the expression “at least one” has been partially omitted for the sake of simplicity. If a feature of the technology disclosed here is described in the singular or indefinitely (e.g. the/a pressure vessel, the/a line, etc.), the plurality thereof should also be disclosed at the same time (e.g. the at least one pressure vessel, the at least one line , Etc.).

The foregoing description of the present invention is for illustrative purposes only and not for the purpose of limiting the invention. Various changes and modifications can be made within the scope of the invention without departing from the scope of the invention and its equivalents.

Reference List

10

pressure vessel assembly

20

pressure vessel

21

first longitudinal end

22

second longitudinal end

25

lanyard

30

connection element

31

first line connection

32

second line connection

33

container connection

34

tank shut-off valve

35

check valve

36

thermal pressure relief device

37

relief outlet

38

Excess flow valve

39

filter

40

thermal pressure relief device

41

manually operated valve

45

temperature sensor

50

first connection line

51

first connection point

52

second connection point

55

first piece of connecting cable

56

second piece of connecting cable

60

second connection line

65

bypass section

70

check valve

75

tank shut-off valve

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 406/2010 [0031]
• EP 79/2009 [0031]
• DE 102015222252 A1 [0034]

Claims (16)

Connection element (30) for a pressure vessel (20), comprising - a first line connection (31) for a connection line (50, 60), - a second line connection (32) for a connecting line (50, 60), - a connecting means (25) for mechanical connection to a pressure vessel (20), and - a tank port (33) which is fluidically connected to an interior of the pressure tank (20) when the connecting means (25) is connected to a pressure tank (20), the first line port (31), the second line port (32) and the container connection (33) is fluidically connected to one another within the connection element (30), and wherein the first line connection (31) and the second line connection (32) are at the same distance from the connecting means (25). Connection element (30) after claim 1 , wherein the first line connection (31) and the second line connection (32) have an equal distance from the pressure vessel (20) when the connecting means (25) is connected to a pressure vessel (20). Connection element (30) after claim 1 or 2 , wherein the first line connection (31) and the second line connection (32) are arranged opposite to one another on the connecting element (30). Connection element (30) according to one of the preceding claims, wherein the first line connection (31) and the second line connection (32) are connected to one another in a straight line. Connection element (30) according to one of the preceding claims, wherein the connecting means (25) is designed as a thread or has a thread. Connection element (30) according to one of the preceding claims, wherein a connection between the first line connection (31) and the second line connection (32) has a larger cross section than a connection between the line connections and the container connection (33). Connection element (30) according to any one of the preceding claims, wherein the connection element (30) further comprises one or more of the following components: - a tank shut-off valve (34) which is fluidically connected between the line connections (31, 32) and the tank connection (33), - a check valve (35) which is fluidically connected between the line connections (31, 32) and the container connection (33) and whose flow direction points towards the container connection (33), - a thermal pressure relief device (36) which is fluidically connected to the container connection (33), - A temperature sensor (45) facing towards the interior of the pressure vessel (20) when the connecting means (25) is connected to a pressure vessel (20). pressure vessel assembly (10), - comprising a plurality of pressure vessels (20) which are arranged parallel to one another, each pressure vessel (20) having a connection element (30) at one longitudinal end (21, 22), and the connection elements (30) in all or at least some of the pressure vessels (20) are arranged at alternating longitudinal ends (21, 22). pressure vessel assembly (10). claim 8 , Wherein the connection elements (30) according to one of Claims 1 until 7 are trained. pressure vessel assembly (10). claim 8 or 9 , which has a first connecting line (50) and a second connecting line (60), the first connecting line (50) connecting connecting elements (30) at first longitudinal ends (21) of the pressure vessels (20) and the second connecting line (60) connecting connecting elements (30 ) connects the pressure vessel (20) at second longitudinal ends (22), the second longitudinal ends (22) being arranged opposite to the first longitudinal ends (21). pressure vessel assembly (10). claim 10 , wherein the connection elements (30) for direct fluidic connection of the connection lines (50, 60) are formed with interiors of the pressure vessel (20). pressure vessel assembly (10). claim 11 , which has one or more common tank shut-off valves (75) and/or one or more check valves (70) with the passage direction directed toward the interior of the pressure tank (20), which is fluidically connected to a number of pressure tanks (20) via at least one connecting line (50, 60). are connected. pressure vessel assembly (10). claim 10 , wherein a tank shut-off valve (34) and/or a non-return valve (35) with the passage direction pointing towards the interior of the pressure vessel (20) is arranged in each connection element (30) and fluidically between the interior of the pressure vessel (20) and the connection line (50 , 60) is connected. Pressure vessel assembly (10) according to any one of Claims 10 until 13 , wherein the first connecting line (50) and the second connecting line (60) are fluidically connected to one another at one or two connection points (51, 52). Pressure vessel assembly (10) according to any one of Claims 8 until 14 wherein the pressure vessels (20) have a thermal pressure relief device (40) on a longitudinal end (21, 22) opposite the connection element (30). Motor vehicle, comprising at least one pressure vessel assembly (10) according to one of Claims 8 until 15 .

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