Tank system and method for monitoring the seality of a tank system

Abstract

The proposed invention relates to a tank system (100) for supplying a consumer (115) with a fluid, the tank system (100) comprising: at least one tank (101); a system isolation valve (107); a mechanically controlled pressure regulator (111), the system isolation valve (107) being fluidically connected to the pressure regulator (111) via a system line (113), the at least one tank (101) comprising a tank valve (103), the tank valve (103) being fluidically connected to the system isolation valve (107) via a tank line (109); a tank line sensor (109) arranged on the tank line (105); a system pipeline sensor (117) arranged on the system pipeline (113); and a calculation unit (119).

Description

Technical Field

[0001] The claimed invention relates to a tank system, a fuel cell system and a method for monitoring the leak tightness of a tank system according to the appended claims. Background Art

[0002] Tank systems with high-pressure storage, such as those used to supply fuel cell systems with hydrogen, typically comprise a system isolation valve which separates the high-pressure region from the medium-pressure region of the respective tank system.

[0003] The mechanical pressure regulator is arranged between the system isolation valve and the consumer and is used to regulate the pressure at which the fluid is delivered from the corresponding high-pressure reservoir to the consumer.

[0004] In order to be able to use the system isolation valve as a redundant shut-off valve, it is necessary to monitor the tightness of the system isolation valve. Summary of the Invention

[0005] The present invention provides a tank system, a fuel cell system, and a method for monitoring the leak tightness of a tank system. Further features and details of the invention can be derived from the corresponding dependent claims, the description, and the drawings. Features and details described in connection with the method according to the invention naturally also relate to the tank system according to the invention or the fuel cell system according to the invention, and vice versa. Therefore, reference is always made to the disclosure of the various inventive aspects.

[0006] The proposed invention aims in particular to provide a reliable tank system.

[0007] Thus, according to a first aspect of the proposed invention, a tank system for supplying a fluid to a consumer is proposed.

[0008] The proposed tank system comprises: at least one tank; a system isolation valve; a mechanically controlled pressure regulator, wherein the system isolation valve is fluidically connected to the pressure regulator via an intermediate line, wherein at least one tank comprises a tank valve, wherein the tank valve is fluidically connected to the system isolation valve via a tank line; and a computing unit.

[0009] The computing unit is electrically connected to the tank valves and the system isolation valve and is configured to, in a first step, initially close the tank valve of at least one tank during the flow of fluid from the tank system to the consumer, and to subsequently close the system isolation valve in a second step, so that a tank pressure in the at least one tank is greater than a tank line pressure in the tank line, and the tank line pressure is greater than a system line pressure in the system line, and the pressure regulator is opened to fluidically connect the intermediate line in an intermediate region between the system isolation valve and the pressure regulator to the supply line between the pressure regulator and the consumer.

[0010] The calculation unit is further configured to infer a first fluid mass in an area before the system isolation valve at a first point in time based on a first tank line temperature and a pressure in the tank line determined at the first point in time, and to infer a first fluid mass in an area after the system isolation valve at the first point in time based on a system line temperature and a pressure in the system line determined at the first point in time.

[0011] The calculation unit is further configured to infer a second fluid mass in the region upstream of the system isolation valve at the second time point based on the second tank line temperature and the pressure in the tank line determined at the second time point, and to infer a second fluid mass in the region downstream of the system isolation valve at the second time point based on the second system line temperature and the pressure in the system line determined at the second time point, and to monitor the tightness of the tank system based on a change in the first fluid mass in the region upstream of the system isolation valve relative to the second fluid mass in the region upstream of the system isolation valve and / or based on a change in the first fluid mass in the region downstream of the system isolation valve relative to the second fluid mass in the region downstream of the system isolation valve.

[0012] In the context of the present invention, a computing unit is to be understood as a computer, a processor, a sub-processor, a controller or any other programmable circuit.

[0013] In the context of the present invention, the area before the system isolation valve is understood to be the area arranged before the system isolation valve in the flow direction of the fluid flowing out of the tank, in particular the area between the tank and the system isolation valve. Correspondingly, in the context of the present invention, the area after the system isolation valve is understood to be the area arranged after the system isolation valve in the flow direction of the fluid flowing out of the tank, in particular the area between the system isolation valve and the consumer.

[0014] In the context of the present invention, the second point in time is to be understood as a point in time that is temporally subsequent to the first point in time.

[0015] The proposed invention is based on a tank system comprising electrically controlled valves, namely, tank valves of the respective tank and system isolation valves. Accordingly, the tank valve or valves and the system isolation valve can be controlled or regulated by a computing unit provided according to the invention. To this end, the valves are connected to the computing unit, for example, via a wired interface.

[0016] In order to monitor the tightness of the proposed tank system, the computing unit performs the following process, wherein, during the time when a consumer takes or delivers fluid from the tank system, the tank valve is initially closed in a first step, so that a pressure difference is formed in the tank line between the tank and the consumer or the system isolation valve, because the consumer removes fluid mass from the tank line and the pressure in the tank line decreases.

[0017] Subsequently, i.e., temporally after the first step, the system isolation valve is closed in a second step, resulting in a pressure difference between the area upstream of the system isolation valve and the area downstream of the system isolation valve. This is because the consumer removes fluid mass from the area downstream of the system isolation valve, and the pressure in the area downstream of the system isolation valve decreases. Accordingly, after the second step, a state is established in the tank system in which the tank pressure in the tank is greater than the tank line pressure in the tank line, and the tank line pressure is greater than the system line pressure in the system line in the area downstream of the system isolation valve. The pressure regulator opens to fluidically connect the intermediate line in the intermediate area between the system isolation valve and the pressure regulator to the supply line between the pressure regulator and the consumer. This means that, due to the second step, the pressure regulator remains open even after the consumer is shut down or deactivated.

[0018] By performing the first and second steps, different pressures are set in at least the area before the system isolation valve and the area after the system isolation valve in the storage tank system, and these areas are isolated from each other. Accordingly, if the system isolation valve is properly closed or sealed, the pressure curve in the area before the system isolation valve can be evaluated independently of the pressure curve in the area after the system isolation valve.

[0019] In order to monitor the change in the tightness of the tank system over time, it is provided that: at a first point in time, in particular after a consumer has been deactivated, a pressure in the area upstream of the system isolation valve is ascertained by means of a tank line sensor arranged in the area upstream of the system isolation valve, a first fluid mass in the area upstream of the system isolation valve is inferred based on this pressure at the first point in time, and the first fluid mass in the area upstream of the system isolation valve is compared with a second fluid mass in the area upstream of the system isolation valve, which second fluid mass is determined by means of the pressure ascertained by the tank line sensor at the second point in time.

[0020] It can be provided that the calculation unit is configured to mathematically associate the measurement value obtained by the tank pipeline sensor with the temperature in the tank system and the predetermined volume of the area before the system isolation valve to determine the fluid mass in the area before the system isolation valve, and to mathematically associate the measurement value obtained by the system pipeline sensor with the temperature in the tank system and the predetermined volume of the area after the system isolation valve to determine the fluid mass in the area after the system isolation valve.

[0021] To determine the temperature in the tank system, temperature sensors in the tank system may be used, in particular in the respective tank or in the surroundings of the tank system, and / or a mathematical model of the tank system may be used.

[0022] By comparing a first fluid mass in the area upstream of the system isolation valve with a second fluid mass in the area upstream of the system isolation valve, a change in the fluid mass in the area upstream of the system isolation valve over time can be inferred, so that if, for example, the second fluid mass in the area upstream of the system isolation valve is less than the first fluid mass in the area upstream of the system isolation valve, a leak in the area upstream of the system isolation valve can be reliably detected.

[0023] By comparing the second fluid mass in the area behind the system isolation valve with the first fluid mass in the area behind the system isolation valve, the change in the fluid mass in the area behind the system isolation valve over time can be inferred, so that if, for example, the second fluid mass in the area behind the system isolation valve is less than the first fluid mass in the area behind the system isolation valve, a leakage in the area behind the system isolation valve can be reliably identified.

[0024] It can be provided that the calculation unit is configured to output an error message indicating a leakage of the system isolation valve if the mass of the second fluid in the area before the system isolation valve decreases relative to the mass of the first fluid in the area before the system isolation valve, and at the same time the mass of the second fluid in the area after the system isolation valve increases relative to the mass of the first fluid in the area after the system isolation valve.

[0025] If the mass of the second fluid in the area after the system isolation valve increases while the mass of the second fluid in the area before the system isolation valve decreases, it can be assumed that the fluid is flowing from the area before the system isolation valve through the system isolation valve into the area after the system isolation valve in the direction of the pressure drop. Accordingly, it can be concluded that the system isolation valve is leaking or malfunctioning, and a corresponding error message is output.

[0026] It can also be provided that the calculation unit is configured to output an error message indicating a leakage in the area between the tank valve and the system isolation valve if the mass of the second fluid in the area before the system isolation valve decreases relative to the mass of the first fluid in the area before the system isolation valve, and at the same time the mass of the second fluid in the area after the system isolation valve does not increase relative to the mass of the first fluid in the area after the system isolation valve.

[0027] It can also be provided that the calculation unit is configured to output an error message if the second fluid mass in the area before the system isolation valve is greater than the first fluid mass in the area before the system isolation valve, the storage message indicating a leak in the area before the system isolation valve, in particular a leak of at least one tank valve.

[0028] If the mass of the second fluid in the area before the system isolation valve increases relative to the mass of the first fluid in the area before the system isolation valve, that is, if the mass of the fluid in the area before the system isolation valve, in particular the mass of the fluid in the tank line, increases over time, it can be assumed that the fluid flows from the tank into the area before the system isolation valve or into the tank line, which must be caused by at least one leaking tank valve.

[0029] To output the error message, the computing unit can, for example, store the error message in a searchable manner in a memory, for example an error memory, and / or transmit the error message to a display, for example a display screen of a consumer supplied with fluid from the tank system.

[0030] It can also be provided that the computing unit is configured to output a credibility message indicating the sealing of the tank system if the mass of the first fluid in the area before the system isolation valve is equal to the mass of the second fluid in the area before the system isolation valve, and the mass of the first fluid in the area after the system isolation valve is equal to the mass of the second fluid in the area after the system isolation valve.

[0031] If all fluid masses remain constant over time, it can be assumed that there are no leaks in the tank system and a plausibility message can be output.

[0032] It can also be provided that the computing unit includes an interface for communicating with the consumer, and the computing unit is configured to receive a deactivation instruction for deactivating the consumer from the consumer and select a time point for closing the tank valve in response to the deactivation instruction, or receive a time point for closing the tank valve from the consumer.

[0033] In order to utilize the proposed controlled pressure drop in the tank system and to set different pressure zones in the tank system, the consumer must be in a state in which fluid is delivered from the tank system, but its function cannot be disrupted by closing the tank valve and the system isolation valve. This state occurs when the consumer is deactivated, so the point in time for closing the tank valve can be selected based on the deactivation command for deactivating the consumer, for example within a predetermined time range after the deactivation command.

[0034] The time point for closing the system isolation valve may be selected accordingly according to the time point for closing the tank valve and / or according to the deactivation instruction and corresponds to a predetermined time range after the time point for closing the tank valve.

[0035] It can also be provided that the calculation unit is configured to receive information from the consumer about the consumer's expected fluid consumption and select a point in time for closing the system isolation valve in response to the expected fluid consumption, so that the consumer reduces the pressure in the area after the system isolation valve and opens the pressure regulator.

[0036] In order to utilize the fluid consumption of the respective consumers to reduce the pressure in the area downstream of the system isolation valve, a state in which the system isolation valve is closed and the consumers are no longer withdrawing fluid should be avoided. Accordingly, the time point for closing the system isolation valve should be selected such that the remaining amount of fluid still withdrawn by the consumers before deactivating fluid withdrawal corresponds to the mass of fluid in the area downstream of the system isolation valve and upstream of the consumers.

[0037] It may also be provided that the storage tank system is a hydrogen pressure storage tank system, and at least one storage tank is a hydrogen pressure storage tank.

[0038] It can also be provided that the calculation unit is configured to determine the tank line temperature in the tank line with the help of a tank line temperature sensor and / or a mathematical model for determining the tank line temperature, and / or to determine the system line temperature in the system line with the help of a system line temperature sensor and / or a mathematical model for determining the system line temperature.

[0039] According to a second aspect, the proposed invention relates to a fuel cell system.

[0040] The proposed fuel cell system includes a possible embodiment of the proposed tank system, wherein a controller of the fuel cell system is communicatively connected to a processing unit of the tank system.

[0041] In particular, the computing unit of the tank system can be configured to output an error message and / or a plausibility message on a display of the fuel cell system.

[0042] According to a third aspect, the proposed invention relates to a method for monitoring the leak tightness of a tank system.

[0043] The proposed method comprises closing a tank valve of at least one tank of the tank system during a flow of fluid from the tank system to a consumer, closing a system isolation valve after the tank valve is closed so that a tank pressure in the at least one tank is greater than a tank line pressure in the tank line between the at least one tank and the system isolation valve, and the tank line pressure is greater than a system line pressure in the system line in a region downstream of the system isolation valve, and opening a pressure regulator between the system isolation valve and the consumer to fluidically connect an intermediate line in an intermediate region between the system isolation valve and the pressure regulator to a supply line between the pressure regulator and the consumer, determining a first fluid mass in the region upstream of the system isolation valve at a first time based on a first forward flow temperature ascertained for the region upstream of the system isolation valve at the first time, and determining a first fluid mass in the region upstream of the system isolation valve based on a first forward flow temperature ascertained for the region upstream of the system isolation valve at the first time. Determine a second fluid mass in the area before the system isolation valve at the second time point based on a second front flow temperature determined for the area before the system isolation valve at the second time point, determine the first fluid mass in the area after the system isolation valve at the first time point based on a first rear flow temperature determined for the area after the system isolation valve at the first time point, determine the second fluid mass in the area after the system isolation valve at the second time point based on the second rear flow temperature determined for the area after the system isolation valve at the second time point, monitor the tightness of the tank system based on a change in the first fluid mass in the area before the system isolation valve relative to the second fluid mass in the area before the system isolation valve and / or based on a change in the first fluid mass in the area after the system isolation valve relative to the second fluid mass in the area after the system isolation valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Other advantages, features and details of the present invention will be apparent from the following description, in which embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, the features mentioned in the claims and the description may become the key content of the present invention alone or in any combination.

[0045] It shows:

[0046] Figure 1 Schematic diagram of one possible configuration of the proposed tank system;

[0047] Figure 2 A schematic diagram of a possible configuration of the proposed fuel cell system;

[0048] Figure 3 Schematic diagram of one possible configuration of the proposed method. DETAILED DESCRIPTION

[0049] Figure 1 1 shows a storage tank system 100. The storage tank system 100 includes a plurality of storage tanks 101, each of which includes a storage tank valve 103.

[0050] The tank 101 or the tank valve 103 is connected to a system isolation valve 107 in a fluid-conducting manner via a tank line 105 .

[0051] The tank line 105 is provided with not only a tank line sensor 109 , which is configured to detect the pressure within the tank line 105 , but can also selectively detect the temperature.

[0052] Accordingly, the storage tank 101 , the storage tank valve 103 , the storage tank pipeline 105 and the storage tank pipeline sensor 109 constitute an area before the system isolation valve 107 .

[0053] In the region downstream of the system isolation valve 107 , a pressure regulator 111 is arranged, which regulates the pressure in a system line 113 in order to supply fluid to a consumer 115 .

[0054] A system pipeline sensor 117 is arranged on the system pipeline 113 , and the system pipeline sensor is configured to detect the pressure in the system pipeline 113 , and optionally detect the temperature.

[0055] In addition, the tank system 100 also includes a calculation unit 119, which is configured to: in a first step, first close the tank valve 103 while the fluid flows from the tank system 100 to the consumer 115; in a second step, then close the system isolation valve 107, so that the tank pressure in the corresponding tank 101 is greater than the tank line pressure in the tank line 105, and the tank line pressure is greater than the system line pressure in the system line 113, and the pressure regulator 111 is opened, and the intermediate line 121 in the intermediate area between the system isolation valve 107 and the pressure regulator 111 and the supply line 123 between the pressure regulator 111 and the consumer 115 are fluid-guided and connected.

[0056] The calculation unit 119 is further configured to: infer a first fluid mass in the region before the system isolation valve 107 at the first time point based on the measurement value obtained by the tank line sensor 109 at the first time point; and infer a first fluid mass in the region after the system isolation valve 107 at the first time point based on the measurement value obtained by the system line sensor 117 at the first time point; and infer a second fluid mass in the region before the system isolation valve 107 at the second time point based on the measurement value obtained by the tank line sensor 109 at the second time point; and infer a second fluid mass in the region after the system isolation valve 107 at the second time point based on the measurement value obtained by the system line sensor 117 at the second time point; and monitor the sealing of the tank system 101 based on a change in the first fluid mass in the region before the system isolation valve 107 relative to the second fluid mass in the region before the system isolation valve 107, and / or based on a change in the first fluid mass in the region after the system isolation valve 107 relative to the second fluid mass in the region after the system isolation valve 107.

[0057] Optionally, a temperature sensor 125 is arranged on the storage tank 101 for detecting the temperature of the fluid (i.e., particularly hydrogen) stored in the corresponding storage tank 101 and calculating the mass of the fluid in the area before the system isolation valve 107 and / or the area after the system isolation valve 107. To this end, for example, the value determined by the temperature sensor 125 can be fed into a mathematical model of the storage tank system 100.

[0058] Figure 2 The fuel cell system 200 is shown in FIG. The fuel cell system 200 includes a Figure 1 The tank system 100 and the controller 201 are communicatively connected to the computing unit 119 of the tank system 100 .

[0059] Figure 3 A method 300 for monitoring the leak tightness of a storage tank system is shown in FIG.

[0060] The method 300 includes a first closing step 301, in which a tank valve of at least one tank of the tank system is closed while fluid flows from the tank system to the consumer; a second closing step 303, in which, after the tank valve is closed, the system isolation valve is closed so that the tank pressure in at least one tank is greater than the tank line pressure in the tank line between the at least one tank and the system isolation valve, and the tank line pressure is greater than the system line pressure in the system line in the area after the system isolation valve, and the pressure regulator between the system isolation valve and the consumer is opened, and the intermediate line in the intermediate area between the system isolation valve and the pressure regulator is connected to the supply line between the pressure regulator and the consumer in a fluid-conducting manner.

[0061] In addition, the method 300 further includes a first determining step 305, in which a first fluid mass in the area before the system isolation valve at a first time point is determined based on a measurement value obtained by a tank line sensor arranged in the area before the system isolation valve at a first time point and the pressure in the area before the system isolation valve; a second determining step 307, in which a second fluid mass in the area before the system isolation valve at a second time point is determined based on a measurement value obtained by the tank line sensor at a second time point and the pressure in the area before the system isolation valve; and a third determining step 309, in which a second fluid mass in the area before the system isolation valve at a second time point is determined based on a measurement value obtained by a system line sensor arranged in the area after the system isolation valve at a first time point. a fourth determining step 311, in which the second fluid mass in the area after the system isolation valve at the second time point is determined based on the measurement value obtained by the system pipeline sensor at the second time point and the pressure in the area after the system isolation valve; and a monitoring step 313, in which the sealing of the tank system is monitored based on the change of the first fluid mass in the area before the system isolation valve relative to the second fluid mass in the area before the system isolation valve, and / or based on the change of the first fluid mass in the area after the system isolation valve relative to the second fluid mass in the area after the system isolation valve.

[0062] In particular, the third determining step 309 is performed in parallel with the first determining step 305 or is performed immediately after the first determining step 305 .

[0063] In particular, the fourth determining step 311 is performed in parallel with the second determining step 307 or is performed immediately after the second determining step 307 .

Claims

1. A tank system (100) for supplying a fluid to a consumer (115), in, The storage tank system (100) comprises: at least one storage tank (101), Mechanically controlled pressure regulator (111), A system isolation valve (107), wherein the system isolation valve (107) is fluidically connected to the pressure regulator (111) via an intermediate line (121), wherein the at least one storage tank (101) comprises a tank valve (103), wherein the tank valve (103) is fluidically connected to the system isolation valve (107) via a tank line (105), and a calculation unit (119), wherein the calculation unit (119) is electrically connected to the tank valve (103) and the system isolation valve (107), Wherein, the computing unit (119) is configured to: In a first step, during the flow of fluid from the tank system (100) to the consumer (115), the tank valve (103) of the at least one tank (101) is first closed, and In a second step, the system isolation valve (107) is then closed, so that the tank pressure in the at least one storage tank (101) is greater than the tank line pressure in the tank line (105), and the tank line pressure is greater than the system line pressure in the system line (113), and the pressure regulator (111) is opened to connect the intermediate line (121) in the intermediate area between the system isolation valve (107) and the pressure regulator (111) to the supply line (123) between the pressure regulator (111) and the consumer (115) in a fluid-conducting manner, and Wherein, the computing unit (119) is further configured to: Based on a first tank line temperature and a pressure in the tank line (105) ascertained at a first time, a first fluid mass in a region upstream of the system isolation valve (107) at the first time is inferred, and based on a first system line temperature and a pressure in the system line (113) ascertained at the first time, a first fluid mass in a region downstream of the system isolation valve (107) at the first time is inferred, Wherein, the computing unit (119) is further configured to: Based on a second tank line temperature and pressure in the tank line determined at a second time, a second fluid mass in a region upstream of the system isolation valve (107) at the second time is inferred, and based on a second system line temperature and pressure in the system line (113) determined at the second time, a second fluid mass in a region downstream of the system isolation valve (107) at the second time is inferred, The sealing performance of the tank system (100) is monitored based on a change in the mass of the first fluid in the area before the system isolation valve (107) relative to the mass of the second fluid in the area before the system isolation valve (107), and / or based on a change in the mass of the first fluid in the area after the system isolation valve (107) relative to the mass of the second fluid in the area after the system isolation valve (107).

2. The storage tank system (100) according to claim 1, It is characterized by: The calculation unit (119) is configured to output an error message indicating a leakage of the system isolation valve (107) if the second fluid mass in the area before the system isolation valve (107) decreases relative to the first fluid mass in the area before the system isolation valve (107) and at the same time the second fluid mass in the area after the system isolation valve (107) increases relative to the first fluid mass in the area after the system isolation valve (107).

3. The storage tank system (100) according to claim 1 or 2, It is characterized by: The calculation unit (119) is configured to output an error message indicating a leakage in the area between the tank valve (103) and the system isolation valve (107) if the second fluid mass in the area before the system isolation valve (107) decreases relative to the first fluid mass in the area before the system isolation valve (107) and the second fluid mass in the area after the system isolation valve (107) does not increase relative to the first fluid mass in the area after the system isolation valve (107).

4. The tank system (100) according to any one of the preceding claims, It is characterized by: The calculation unit (119) is configured to output an error message indicating that at least one tank valve (103) is leaking into the area before the system isolation valve (107) if the second fluid mass in the area before the system isolation valve (107) is greater than the first fluid mass in the area before the system isolation valve (107).

5. The tank system (100) according to any one of the preceding claims, It is characterized by: The calculation unit (119) is configured to output an error message indicating a leakage in the area after the system isolation valve (107) if the second fluid mass in the area after the system isolation valve (107) is less than the first fluid mass in the area after the system isolation valve (107).

6. The tank system (100) according to any one of the preceding claims, It is characterized by: The calculation unit (119) is configured to output a credibility message indicating the tightness of the tank system (100) if the first fluid mass in the area before the system isolation valve (107) is equal to the second fluid mass in the area before the system isolation valve (107), and the first fluid mass in the area after the system isolation valve (107) is equal to the second fluid mass in the area after the system isolation valve (107).

7. The tank system (100) according to any one of the preceding claims, It is characterized by: The calculation unit (119) is configured to mathematically correlate the measurement value obtained by the tank line sensor (109) with the temperature in the tank system (100) and the predetermined volume of the area before the system isolation valve (107) to determine the fluid mass in the area before the system isolation valve (107), and to mathematically correlate the measurement value obtained by the system line sensor (117) with the temperature in the tank system (100) and the predetermined volume of the area after the system isolation valve (107) to determine the fluid mass in the area after the system isolation valve (107).

8. The tank system (100) according to any one of the preceding claims, It is characterized by: The computing unit (119) comprises an interface for communicating with the consumer (115), and the computing unit (119) is configured to: receiving a deactivation instruction from the consumer (115) for deactivating the consumer (115), and / or, selecting a time point for closing the tank valve (103) in response to the deactivation instruction, or receiving a time point for closing the tank valve (103) from the consumer (115).

9. The tank system (100) according to any one of the preceding claims, It is characterized by: The calculation unit (119) is configured to receive information about an expected fluid consumption of the consumer (115) from the consumer (115) and select a point in time for closing the system isolation valve (107) in response to the expected fluid consumption, so that the consumer (115) reduces the pressure in the area after the system isolation valve (107) and opens the pressure regulator (111).

10. The tank system (100) according to any one of the preceding claims, It is characterized by: The storage tank system (100) is a hydrogen pressure storage tank system, and the at least one storage tank (101) is a hydrogen pressure storage tank.

11. The tank system (100) according to any one of the preceding claims, It is characterized by: The calculation unit is configured to determine the tank line temperature in the tank line (105) by means of the tank line temperature sensor and / or a mathematical model for determining the tank line temperature, and / or The system line temperature in the system line (113) is ascertained by means of a system line temperature sensor and / or a mathematical model for ascertaining the system line temperature.

12. A fuel cell system (200) for energy conversion, in, The fuel cell system (200) comprises the tank system (100) according to any one of claims 1 to 11, wherein a controller (201) of the fuel cell system (200) is communicatively connected to the computing unit (119) of the tank system (100).

13. A method (300) for monitoring the tightness of a storage tank system (100), in, The method (300) comprises: closing (301) a tank valve (103) of at least one tank (101) of the tank system (100) during the flow of fluid from the tank system (100) to a consumer (115), After the tank valve (103) is closed, the system isolation valve (107) is closed (303) so that the tank pressure in the at least one tank (101) is greater than the tank line pressure in the tank line (105) between the at least one tank (101) and the system isolation valve (107), and the tank line pressure is greater than the system line pressure in the system line (113) in the area after the system isolation valve (107), and the pressure regulator (111) between the system isolation valve (107) and the consumer (115) is opened in order to connect the intermediate line (121) in the intermediate area between the system isolation valve (107) and the pressure regulator (111) to the supply line (123) between the pressure regulator (111) and the consumer (115) in a fluid-conducting manner, determining (305) a first fluid mass in the region upstream of the system isolation valve (107) at the first point in time based on a first forward flow temperature determined for the region upstream of the system isolation valve (107) and a pressure in the region upstream of the system isolation valve, determining (307) a second fluid mass in the region upstream of the system isolation valve (107) at the second time point based on a second forward flow temperature determined for the region upstream of the system isolation valve (107) at the second time point and the pressure in the region upstream of the system isolation valve, determining (309) a first fluid mass in the region after the system isolation valve (107) at the first point in time based on a first downstream temperature determined for the region after the system isolation valve (107) and the pressure in the region after the system isolation valve, determining (311) a second fluid mass in the region after the system isolation valve (107) at the second time point based on a second downstream temperature determined for the region after the system isolation valve (107) at the second time point and a pressure in the region before the system isolation valve, The sealing of the tank system (100) is monitored (313) based on a change in the mass of the first fluid in the area before the system isolation valve (107) relative to the mass of the second fluid in the area before the system isolation valve (107), and / or based on a change in the mass of the first fluid in the area after the system isolation valve (107) relative to the mass of the second fluid in the area after the system isolation valve (107).

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