Fuel tank valve and method for operating the fuel tank valve

Abstract

A fuel tank valve (1) for filling and / or discharging a pressure tank, the pressure tank having a tank interior (6) containing fuel and a temperature sensor device (8), the temperature sensor device (8) being incorporated into the fuel tank valve (1) and projecting into the tank interior to monitor the temperature of the fuel therein, the temperature sensor device being attached to a valve housing body (10) and connected to an electrical conducting device (20), the electrical conducting device (20) having at least one longitudinally elongated electrical conductor, the longitudinally elongated electrical conductor extending longitudinally through a longitudinally elongated connecting passage (23) in the valve housing body, the longitudinally elongated electrical conductor being made of an electrically conductive material different from the material from which the valve housing body is made, the longitudinally elongated electrical conductor being positively connected to at least one elongated transmitting body within at least one axial section.

Description

[Technical Field]

[0001] The present invention relates to a fuel tank valve for filling and / or discharging a pressure tank, the pressure tank having a tank interior containing fuel and a temperature sensor device integrated into the fuel tank valve and projecting into the tank interior to monitor the temperature of the fuel therein, the temperature sensor device being attached to a valve housing body and connected to an electrical conductor device having at least one elongated electrical conductor extending longitudinally through an elongated connecting passage in the valve housing body, the elongated electrical conductor being made of an electrically conductive material different from the material from which the valve housing body is made. The present invention also relates to a method for operating such a fuel tank valve in a fuel cell system. [Background technology]

[0002] Patent document 1 discloses an apparatus for storing compressed gas, for example hydrogen or natural gas, which comprises a storage line to which at least one compressed gas container is connected, and in which a safety solenoid valve, also called a shut-off valve, is integrated. Patent document 2 discloses a tank apparatus for storing a gaseous medium, in particular hydrogen, which comprises a valve device and a tank, the valve device having a valve housing including a movable, operating control valve element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] German Patent Application Publication No. 102020201172 [Patent Document 2] German Patent Application Publication No. 102018221602 Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to improve the fuel tank valve according to the preamble of claim 1 in terms of functionality and / or manufacturing technology. [Means for solving the problem]

[0005] The above-mentioned object is achieved by a fuel tank valve for filling and / or discharging a pressure tank, the pressure tank having a tank interior for containing fuel and a temperature sensor device, the temperature sensor device being integrated into the fuel tank valve and projecting into the tank interior to measure the temperature of the fuel therein, the temperature sensor device being attached to a valve housing body and connected to an electrical conducting device, the electrical conducting device having at least one elongated electrical conductor extending longitudinally through an elongated connecting passage in the valve housing body and made of an electrically conductive material different from the material from which the valve housing body is made, the longitudinal electrical conductor being form-fittingly connected to at least one elongated transmitting body within at least one axial section. The longitudinal electrical conductor is made, for example, of a lead frame. The material from which the longitudinal electrical conductor is made is preferably bronze. The longitudinal electrical conductor may have a rectangular cross section. The elongated electrical conductor may, however, have an approximately circular cross-section. The connecting passage may likewise have a rectangular or approximately circular cross-section. At least one elongated electrical conductor, for example, has an outer cross-section that substantially corresponds to the inner cross-section of the connecting passage provided in the valve housing body. Sufficient play should be provided in the connecting passage between the elongated electrical conductor and the valve housing body, so that the elongated electrical conductor can expand unhindered within the valve housing body under temperature influences. A positive-fit connection between the elongated electrical conductor and the elongated electrical conductor ensures that longitudinal forces are transmitted from the elongated electrical conductor to the conductor. The positive connection between the elongated electrical conductor and the elongated electrical conductor ensures that the expansion of the elongated electrical conductor in the longitudinal direction is approximately equal to the expansion of the valve housing body. The term "longitudinal" refers to the longitudinal extension of the elongated electrical conductor. The elongated electrical conductor and the connecting passage provided in the valve housing extend in the same longitudinal direction. The electrical conducting device preferably has two electrical conductors which preferably extend generally parallel to one another through a connecting passage in the valve housing body.In this case, the two longitudinal electrical conductors are preferably arranged coaxially within the connecting passage. To prevent undesired short circuits between the electrical conductors and undesired ground connections between the electrical conductors and the valve housing body, the electrical conductors are sufficiently spaced apart from one another and from the valve housing body within the connecting passage. Compliance with these distances is also preferably ensured by at least one elongated transmission body, in which the two electrical conductors are embedded together in their respective axial sections but sufficiently spaced apart from one another. The elongated transmission body is preferably made of a plastic material, with which the elongated electrical conductors, preferably both elongated electrical conductors, are enveloped in their respective axial sections during injection molding of the elongated transmission body.

[0006] A preferred embodiment of the fuel tank valve is characterized in that the elongated electrical conductor has at least two flared portions spaced apart from one another in the longitudinal direction, the flared portions being embedded in the extensional transmission body. This ensures a stable, positively-fitting connection between the elongated electrical conductor and the extensional transmission body in a simple manner. The elongated electrical conductor preferably has at least two flared portions extending in opposite directions from the elongated electrical conductor. Particularly advantageously, the elongated electrical conductor has two pairs of flared portions, each pair having two flared portions extending in opposite directions from the elongated electrical conductor, the flared portions being spaced apart from one another in the axial direction. The extensional transmission body, for example, has the form of a substantially right circular cylinder arranged with clearance in a longitudinal bore forming a connecting passage in the valve housing body.

[0007] Another preferred embodiment of the fuel tank valve is characterized in that the elongated electrical conductor is positively connected in at least two axial sections to one elastic transmission body, which is arranged with clearance in the connecting passage of the valve housing body. Through the size, number, shape, and material properties of the elastic transmission bodies, the different elongations of the elongated electrical conductor or conductors and the valve housing body can be very effectively adjusted and matched to one another. This makes it possible, in particular, for there to be no significant difference in the elongation of the elongated electrical conductor or conductors and the valve housing body, even during strong temperature fluctuations.

[0008] Another preferred embodiment of the fuel tank valve is characterized in that the elongated electrical conductor has a clearance between the two extensible transmission bodies, and in the clearance, the elongated electrical conductor is arranged in the connecting passage at a sufficient insulating distance from the valve housing body. If the two elongated electrical conductors extend through both extensible transmission bodies, they are also arranged at a sufficient insulating distance relative to each other. The clearance between the two extensible transmission bodies advantageously prevents the elongated electrical conductor from contacting the valve housing body and causing an undesirable high temperature rise. However, the clearance has a smaller axial dimension than the extensible transmission bodies. This ensures that the elongated electrical conductor exerts its desired elongational transmission function from the valve housing body to the desired extent.

[0009] Another preferred embodiment of the fuel tank valve is characterized in that the end of the elongated electrical conductor facing the tank interior is positively connected to a retaining body, which is force-lockingly and additionally positively connected to the valve housing body in the connecting passage so that the retaining body cannot move any further into the connecting passage. The retaining body provides a kind of fixed bearing for the end of the elongated electrical conductor facing the tank interior. This ensures that the electrical connection of the elongated electrical conductor to the temperature sensor device is stable even at different temperatures in the tank interior.

[0010] Another preferred embodiment of the fuel tank valve is characterized in that the end of the elongated electrical conductor facing away from the tank interior is electrically connected to a connecting line by a plug connection. The connecting line is used, for example, to connect the elongated electrical conductor arranged in the connecting passage to a terminal connector arranged outside the pressure tank. The plug connection provides a type of free bearing, which simplifies the manufacture of the fuel tank valve, in particular the connection of a temperature sensor device integrated into the fuel tank valve to a terminal connector attached to the valve housing on the outside. The claimed combination of the electrical conducting device with at least one, preferably multiple, elongated transmission bodies ensures that the electrical contact within the plug connection between the elongated electrical conductor and the connecting line is not impaired by differential elongation under the influence of temperature.

[0011] Another preferred embodiment of the fuel tank valve is characterized in that the longitudinal electrical conductor and the one or more extensible transmission bodies are selected and designed with respect to their cross-sections, moduli of elasticity and temperature expansion coefficients, as well as their number, shape, and size, so that the longitudinal electrical conductor does not expand differently in its longitudinal direction than the valve housing body at different operating temperatures, or so that the expansion does not impair the function of the plug connection provided at the end of the longitudinal electrical conductor facing away from the tank interior. "Not impairing" particularly means that the longitudinal electrical conductor may indeed expand differently from the valve housing body, within acceptable tolerances, in some cases, but this does not impair the function of the plug connection. The different expansions under temperature influence can be represented by a spring model and calculated using corresponding expansion equations. The calculations can be checked, for example, by the finite element method.

[0012] Another preferred embodiment of the fuel tank valve is characterized in that the longitudinal electrical conductor is made of a bronze material, the valve housing body is made of an aluminum material, and the one or more extension transmission bodies are made of a plastic material. The bronze material is preferably an alloy containing copper and tin. The aluminum material is preferably an alloy containing aluminum and magnesium. The plastic material is preferably a thermoplastic plastic material, in particular a polyester, such as polybutylene terephthalate. These materials, in this combination, have proven particularly advantageous for the claimed application.

[0013] In a method for operating the aforementioned fuel tank valve in a fuel cell system at different operating temperatures, the above-mentioned object is alternatively or additionally achieved by causing the longitudinal electrical conductor to elongate at different operating temperatures in a manner that is the same or similar to the valve housing body in the longitudinal direction of the longitudinal electrical conductor, within an acceptable tolerance range. The same or similar elongation is ensured by one or more elongation transmitting bodies.

[0014] The invention also relates to a fuel cell system, possibly comprising at least one pressure tank equipped with at least one fuel tank valve as described above.

[0015] The present invention further relates to an extension transmission body, an elongated electrical conductor and / or a valve housing body for the aforementioned fuel tank valve. These listed components can be addressed separately.

[0016] Further advantages, features and details of the invention can be seen from the following description, in which different exemplary embodiments are explained in detail with reference to the drawings. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective vertical cross-sectional view of a fuel tank valve incorporating a temperature sensor device; [Figure 2]FIG. 2 is an enlarged view of one of the contact areas shown in FIG. [Figure 3] 3 is a perspective view of the contact area shown in FIG. 2, including only one longitudinal electrical conductor. [Figure 4] 1 is an enlarged view of the electrical connection between the temperature sensor device and an electrical conducting device having two longitudinal electrical conductors. [Figure 5] FIG. 5 is an enlarged view of an excerpt from FIG. 4 including only one longitudinal electrical conductor. [Figure 6] 1 is a schematic diagram of a conventional fuel cell system as disclosed in DE 10 2020 208 038 A1. [Figure 7] 2 is an enlarged view of the line section shown in FIG. 1, including one longitudinal electrical conductor. [Figure 8] FIG. 8 is an enlarged view of an excerpt from FIG. 7 to illustrate the calculation of the differential elongation in the longitudinal direction under the influence of temperature. [Figure 9] A surrogate model with four springs for different elongations under the influence of temperature. DETAILED DESCRIPTION OF THE INVENTION

[0018] 6 shows a schematic diagram of a conventional fuel cell system 101. The fuel cell system 101 has an anode pathway 104 that connects a hydrogen tank 128 to the anode 112 of the fuel cell stack 120. At least two valves 132, 134 are disposed within the anode pathway 104.

[0019] The first valve 132 is configured as an isolation or shut-off valve 132. The shut-off valve 132 is open during operation of the fuel cell system 101. When the fuel cell system 101 is shut down, the shut-off valve 132 is closed so that hydrogen can no longer flow from the hydrogen tank 128 to the anode 112.

[0020] The second valve 134 is configured as an HGI valve 134 and is capable of metering the amount of hydrogen required to the anode 112 depending on the operating state of the fuel cell stack 120 at that time.

[0021] A connecting line 108 is disposed between the first valve 132 and the second valve 134. A sensor 110 is present in the connecting line 108 and is capable of determining the pressure in the connecting line 108.

[0022] Hydrogen is often stored at high pressure in a hydrogen tank 128. To reduce this pressure, a pressure regulator 130 may be present between the hydrogen tank 128 and a first valve 132, which reduces the pressure before the hydrogen flows to an HGI valve 134 or to the anode 112. The pressure at the inlet of the first valve 132, which is equal to the tank pressure or reduced by the pressure regulator 130, is referred to as the supply pressure.

[0023] The fuel cell system 101 further includes a cathode gas supply line 115 that supplies air to the cathode 116 of the fuel cell stack 120 , and a cathode gas discharge line 117 that conducts spent air and off-gas from the fuel cell stack 120 .

[0024] During operation of the fuel cell system 101, hydrogen is supplied to the anode passage 104 via a hydrogen tank 128, a first valve 132, and a second valve 134 to the anode 112. Because hydrogen is supplied to the anode 112 in stoichiometric excess for performance and component protection reasons, unconsumed hydrogen is returned via the anode gas return line 114 and re-introduced into the anode passage 104 at the hydrogen return point 122.

[0025] A recirculation pump 142 and additional valves and components may be located within the anode gas return guide line 114 .

[0026] During the fuel cell reaction, nitrogen diffuses from the cathode 116 to the anode 112 and collects in the anode passage 104 via the anode gas return guide line 114, increasing its proportion, so that the nitrogen collected in the anode passage 104 must be removed from the fuel cell system 101 from time to time.

[0027] This can be done here via a purge valve 141, which is arranged in the anode gas return guide line 114. In order to drain excess water from the anode 112 or the anode passage 104, a water separator, a water reservoir and a drain valve may also be arranged in the anode gas return guide line 114, but these are not essential to the invention and are therefore not explicitly shown in the drawings.

[0028] The fuel cell system 101 includes a measurement device that checks at least one of the valves 132, 134. The measurement device includes a sensor 110 that determines a measurement value identifying the current pressure at any location in the connecting line 108 of the anode path 104. In an alternative embodiment, the sensor 110 may additionally determine the current temperature of the gas at this location.

[0029] The sensor 110 is connected by wire or wirelessly to a control unit 111, which allows the measurement values, in particular pressure and / or temperature values, to be captured and evaluated by the method according to the invention to check for leaks in the first valve (shut-off valve) 132 or the second valve (HGI valve) 134.

[0030] The control unit 111 is also connected to other components of the fuel cell system 101. The control unit 111 may have connections to the first valve 132 and / or the second valve 134 so that it can know when the first valve 132 and the second valve 134 are open and closed and factor this into the leak rate calculation.

[0031] Fig. 1 shows a perspective vertical cross-sectional view of a fuel tank valve 1. The fuel tank valve 1 is, for example, a pressure regulating valve such as that assigned to a hydrogen tank 128 in a fuel cell system 101 shown in Fig. 6. Since the hydrogen in the hydrogen tank 128 may be pressurized to a high pressure, for example, up to 700 bar, the hydrogen tank 128 may also be referred to as a pressure tank 128.

[0032] When the fuel tank valve 1 is used in a fuel cell system that operates using hydrogen as fuel, the fuel tank valve 1 may also be called a hydrogen tank valve 1. The fuel tank valve 1 may also be called a tank valve for short. Via the fuel tank valve 1, hydrogen can be removed from a pressure tank. For this purpose, the fuel tank valve 1 is provided with, for example, two fluid ports 2 and 3.

[0033] Depending on the configuration, the pressure tank can also be filled with fuel, in particular hydrogen, via the hydrogen tank valve or fuel tank valve 1. For this purpose, the hydrogen tank valve 1 may be equipped with further fluid ports.

[0034] The fuel tank valve 1 advantageously comprises a plurality of valves. The valves combined in the fuel tank valve 1 are, for example, manually operable valves that allow for the release of pressure from the tank. An air vent valve may also be integrated into the fuel tank valve 1. The pressure regulating valve is, for example, configured as a shut-off valve, which is also called a shut-off valve in English. This shut-off valve is operated electromagnetically.

[0035] Advantageously, at least one sensor device is also integrated into the fuel tank valve 1. This sensor device can be a pressure sensor. At least one temperature sensor device 8 is also integrated into the fuel tank valve 1. The temperature sensor device 8 extends with a sensor body 16 into the tank interior 6 of the pressure tank. An ejector 5 also extends into the tank interior 6 of the pressure tank.

[0036] The fuel tank valve 1 has an electric terminal 4. The electric terminal 4 has a terminal connector 7, and via the electric terminal 4, electric and / or electronic devices provided in the fuel tank valve 1, such as a magnet assembly of a pressure regulating valve or a temperature sensor device 8, can be supplied with power and / or electronically controlled.

[0037] The fuel tank valve 1 comprises a valve housing body 10 made of aluminum material. A connecting passage 23 is provided in the valve housing body 10 for electrical contact with the temperature sensor device 8. In the illustrated embodiment, the connecting passage 23 is configured as a hole with a circular cross section. The connecting passage 23 has a longitudinal axis which coincides with the longitudinal axis of the temperature sensor device 8 and extends vertically in FIG. 1 .

[0038] At the upper end as viewed in Fig. 1, a contact area 9 for the electrical conductor device 20 is arranged. This contact area 9 is used to make the electrical connection of the electrical conductor device 20 to the terminal connector 7. At the lower end as viewed in Fig. 1, the electrical conductor device 20 is electrically connected to the temperature sensor device 8 at a contact area 24.

[0039] 2 shows that in the contact area 9, the two conductors 21, 22 of the electrical conductor device 20 are inserted into the contact forks 17, 18. The contact forks 17, 18 are formed at the lower ends, as viewed in FIG. 2, of two connecting conductors 27, 28. The connecting conductors 27, 28 are used for electrical connection to the terminal connector 7. The contact forks 17, 18 form plug connections 12, 13, which serve as a kind of free bearing for the two electrical conductors 21, 22 of the electrical conductor device 20. To accommodate the plug connections 12, 13, the connecting passage 23 has an enlarged cavity 19 at its upper end, as viewed in FIG. 2, of the connecting passage 23.

[0040] 3, it can be seen that both the conductor 22 and the connecting conductor 28 with the contact fork 18 have a substantially rectangular cross section. The conductors 21, 22 and the connecting conductors 27, 28 are made from a bronze material which has good electrical conductivity.

[0041] FIG. 4 shows an enlarged longitudinal section of the contact area 24. In the contact area 24, the two conductors 21, 22 of the electrical conductor 20 are connected to the sensor wires 51, 52. This electrical connection is formed, for example, by two form-locking and material-locking connections 53, 54. The temperature sensor device 8 has a sensor housing body 55, which is firmly connected to the valve body 10 via a sealing device 56. By means of the form-locking and material-locking connections 53, 54, the contact area 24 forms a kind of fixed bearing for the electrical conductor 20. It can be seen in FIG. 4 that the sensor housing body 55 is supported by a shoulder 57 on the shoulder 11 of the valve housing body 10.

[0042] 5 shows that the form-locking and material-locking connection 54 between the sensor line 52 and the conductor 22 is arranged in the holding body 30. The holding body 30 is made of a plastic material. The form-locking and material-locking connection 53 is, for example, enclosed by the plastic material when the holding body 30 is formed by injection molding this plastic material. The holding body 30 is press-fit into the connecting passage 23 and is additionally fixed axially by a step 58 provided in the connecting passage 23 of the valve housing body 10. This ensures that the holding body 30 cannot move upwards in the connecting passage 23 as viewed in FIG. 5.

[0043] FIG. 7 shows a longitudinal section of only the line section 14 containing the electrical conductor 22 of the electrical conduction device 20 shown in FIG. 1. At different temperatures, the conductor 22, made of bronze material, stretches differently in the line section 14 between the fixed bearing-like contact area 24 and the free bearing-like contact area 9 than the valve housing body 10, made of aluminum material. To prevent this different longitudinal stretching of the conductor 22, which is undesirable in terms of the electrical contact at the contact areas 9 and 24, the conductor 22 is embedded in seven elongation transfer bodies 31-37 in seven axial sections. The number seven relates to the illustrated embodiment. Depending on the configuration, the use of more or fewer elongation transfer bodies may be advantageous.

[0044] The extension bodies 31 to 37 are made of a plastic material, and the conductor 22 is enveloped in the corresponding axial section by this plastic material when the extension bodies 31 to 37 are injection molded. To better anchor the conductor 22 within the extension bodies 31 to 37, the conductor 22 has four protruding portions 25, 26; 65, 66 for each extension body 31 to 37. The protruding portions 25, 26; 65, 66 are arranged in pairs and extend from the conductor 22 in opposite directions.

[0045] 7, it can be seen that one play section 41 to 46 is provided between each pair of longitudinally adjacent elongation transmitting bodies 31, 32; 32, 33; 33, 34; 34, 35; 35, 36; 36, 37. In the play sections 41 to 46, the conductor 22 is not enclosed by the injection-molded plastic material.

[0046] 8 and 9 show how the thermal expansion of the conductor 22 can be approximately matched to the thermal expansion of the valve body 10 by the multiple injection-molded enclosure of the expansion bodies 31-37. The double-headed arrow 61 indicates the diameter of the expansion body 31, which is disposed with play in the connecting passage 23. The double-headed arrow 62 indicates the expansion length between the projections 25, 26 and the projections 65, 66 in the expansion body 31. The double-headed arrow 63 indicates the total length of the line section 14.

[0047] Figure 9 shows a representation of the thermal elongation in the form of a spring model with four springs 71, 72, 73 and 74. Spring 71 represents the valve housing body 10. Arrow 75 indicates the elongation of the valve housing body 10. Spring 72 represents the conductor 22 made of bronze material. Spring 73 represents the elongation transmission body 31 made of plastic material. Spring 74 represents the play section between the two elongation transmission bodies.

[0048] The springs 71-74 are summarized in terms of their stiffness and longitudinal expansion coefficient. Spring 72, which represents a bronze conductor, and spring 73, which represents a plastic strain transmitter, are connected in parallel. Arrow 76 indicates the joint strain of this parallel circuit of 72-73. Arrow 77 indicates the strain of spring 74, which represents the play section, and is connected in series with the parallel circuit of 72 and 73.

[0049] Dimensional arrows 78 and 79 indicate the differential elongation, in particular between the elongation 75 of the valve housing body 10 and the elongation shown in Figure 9 by arrows 76 and 77. The guide element elongation of the axial section of the conductor surrounded by the injection-molded elongation transfer body is calculated and checked, for example, using the finite element method. [Explanation of symbols]

[0050] 1 Fuel tank valves, hydrogen tank valves 2,3 Fluid Ports 4 Electrical Terminal 5 Ejector 6 Tank interior 7 Terminal Connector 8 Temperature sensor device 9 Contact area 10 Valve housing body 11 Step section 12,13 Plug-in connection 14 Line Section 16 Sensor body 17,18 Contact fork 19 voids 20 Electrical Conduction Devices 21,22 Conductor 23 Connecting Passage 24 Contact area 25,26 Protruding part 27,28 Connecting conductor 30 Holding body 31~37 Extension transmission body 41~46 Play area 51,52 Sensor wire 53,54 Geometric and material joints 55 Sensor housing body 56 Sealing device 57,58 Stepped section 61 Double arrow, diameter of extension transmitting body 31 62 Double arrow, extension length between overhangs 25, 26 and overhangs 65, 66 63 Double arrow, total length of line section 14 65,66 Protruding part 71 Spring, valve housing body 10 72 Springs, conductors 22 73 Springs, extension transmission bodies 31 74 Spring, play section between two extension transmitting bodies 75 Arrow, elongation of valve housing body 10 76 Arrow, joint extension 77 Arrow, extension of spring 74 78,79 Dimension arrows, differential expansion 101 Fuel Cell System 104 Anode Path 108 Connection Lines 110 Sensors 111 control unit 112 Anode 114 Anode gas return guide line 115 Cathode gas supply line 116 cathode 117 Cathode gas discharge line 120 fuel cell stack 122 Hydrogen return guide 128 Hydrogen tanks, pressure tanks 130 Pressure Regulating Valve 132 First valve, isolation valve, shutoff valve 134 Second valve, HGI valve 141 Purge valve 142 Recirculation Pump

Claims

1. A fuel tank valve (1) for filling and / or discharging a pressure tank (128), the pressure tank (128) having a tank chamber (6) for containing fuel and a temperature sensor device (8), the temperature sensor device (8) being incorporated in the fuel tank valve (1) and projecting into the tank chamber (6) to detect the temperature of the fuel in the tank chamber (6), the temperature sensor device (8) being attached to a valve housing body (10) and electrically conducting the valve housing body (10) is connected to a conducting device (20), the conducting device (20) having at least one longitudinally elongated electrical conductor (21, 22), the longitudinally elongated electrical conductor (21, 22) extending longitudinally through a longitudinally elongated connecting passage (23) in the valve housing body (10), the longitudinally elongated electrical conductor (21, 22) being made of an electrically conductive material, the electrically conductive material being different from the material from which the valve housing body (10) is made. In the fuel tank valve (1), The longitudinal electrical conductor (21, 22) is connected in a form-locking manner to at least one elongation transmitting body (31-37) in at least one axial section. A fuel tank valve.

2. 2. The fuel tank valve according to claim 1, wherein the longitudinal electrical conductor (21, 22) has at least two protruding portions (25, 26) spaced apart from each other in the longitudinal direction, and the protruding portions (25, 26) are embedded in the extension transmitting body (31-37).

3. 3. The fuel tank valve according to claim 1, wherein the longitudinal electrical conductors (21, 22) are connected in a form-locking manner to one respective extensional transmission body (31-37) in at least two axial sections, and the extensional transmission bodies (31-37) are arranged with play in the connecting passage (23) of the valve housing body (10).

4. 4. The fuel tank valve according to claim 1, wherein the longitudinal electrical conductors (21, 22) have a play section (41-46) between two extension transmission bodies (31-37), and in the play section (41-46), the longitudinal electrical conductors (21, 22) are arranged in the connecting passage (23) with a sufficient insulating distance from the valve housing body (10).

5. 5. A fuel tank valve according to claim 1, wherein the ends of the elongated electrical conductors (21, 22) facing the tank interior (6) are connected in a form-locking manner to a holding body (30), which is connected in a force-locking manner within the connecting channel (23) and additionally in a form-locking manner to the valve housing body (10) so that the holding body (30) cannot move further inside the connecting channel (23).

6. 6. A fuel tank valve according to claim 1, wherein the ends of the longitudinal electrical conductors (21, 22) facing away from the tank interior (6) are electrically connected to connecting lines (27, 28) by means of plug connections (12).

7. 7. A fuel tank valve according to claim 6, characterized in that the elongated electrical conductors (21, 22) and the elongated body / body (31-37) are selected and designed with respect to their cross-sections, moduli of elasticity and temperature expansion coefficients, as well as their number, shape and size, in such a way that the elongated electrical conductors (21, 22) do not expand differently from the valve housing body (10) in the longitudinal direction of the elongated electrical conductors (21, 22) at different operating temperatures or in such a way that the elongated electrical conductors (21, 22) expand without impairing the function of the plug connection (12) provided at the end of the elongated electrical conductors (21, 22) facing away from the tank interior (6).

8. 8. The fuel tank valve according to claim 1, wherein the longitudinal electrical conductors (21, 22) are made of a bronze material, the valve housing body (10) is made of an aluminum material, and the one or more extension transmission bodies (31-37) are made of a plastic material.

9. A method for operating a fuel tank valve (1) in a fuel cell system (101) at different operating temperatures, comprising: the longitudinal electrical conductors (21, 22) have the same or similar elongation as the valve housing body (10) in the longitudinal direction of the longitudinal electrical conductors (21, 22), within acceptable tolerances, at different operating temperatures; 10. A method for operating a fuel tank valve, comprising:

10. An extension transmission body (31-37), longitudinal electrical conductor (21, 22) and / or valve housing body (10) for a fuel tank valve (1) according to any one of claims 1 to 8.

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