Hydrogen bottle and health monitoring method thereof

Abstract

The invention discloses a hydrogen bottle and a health monitoring method thereof. A weakening belt is arranged at a specific position of a bottle body, first sensors are arranged outside an inner container layer and between a carbon fiber winding layer and a protective layer respectively to detect stress-strain values, and second sensors are arranged to measure carbon fiber quality. The monitoring method comprises the following steps: performing standard pressure charging and discharging circulation on a qualified hydrogen cylinder, detecting a stress-strain value by a sensor I, detecting the carbon fiber quality by a sensor II if the stress-strain value exceeds an early-warning value I, triggering an alarm and reducing the charging and discharging pressure if the stress-strain value is lower than an early-warning value II, and repeating detection until reminding and stopping. By presetting a weakening zone, utilizing double sensors to perform double real-time monitoring on regional stress strain and carbon fiber quality, comparing threshold values to trigger multi-stage early warning and dynamically adjusting charging and discharging circulation, the problems of difficulty in defect monitoring and extensive life prediction of a traditional hydrogen cylinder are solved, and support is provided for safe and efficient use of a high-pressure hydrogen storage container.

Description

Technical Field

[0001] The present invention belongs to the field of new energy technology, and particularly relates to a hydrogen bottle and a health monitoring method thereof. Background Art

[0002] Hydrogen energy is a clean, green, low-carbon, and environmentally friendly renewable secondary energy source, playing a vital role in energy supply in society and daily life. In recent years, hydrogen has been widely used in automotive powertrains. High-purity hydrogen generates electricity and heat through electrocatalytic reactions within fuel cells. The electricity is used to drive the vehicle, and the heat can be used for passenger compartment heating, among other purposes. Due to its low physical density, hydrogen storage requires significant storage space and material costs. Under normal conditions, hydrogen for automotive fuel cells is typically stored in 35MPa or 70MPa carbon fiber hydrogen cylinders. Controlling the opening and closing of the cylinder valve and pressure reducing valve allows for effective control of the hydrogen supply. However, under special operating conditions, particularly extreme conditions such as vibration, impact, and collision, the storage safety of hydrogen cylinders has been a significant constraint on the industry's commercial development. Therefore, strict lifespan monitoring of hydrogen cylinders is essential during their use to minimize safety risks.

[0003] In order to realize the health monitoring of hydrogen cylinder groups in related technologies, related technologies such as CN207622711U, CN207622711U and CN115218114B provide online detection of cylinders through the gas pressure value inside the cylinders and the real-time sealing pressure value, and ultrasonic detection of the cylinders by the slide-driven inspection trolley on the outside of the cylinders, and the integrity detection of the entire cylinder is realized by using the circular track and the linear drive motor. Although health monitoring can be realized to a certain extent, there are still problems such as uncertain defect location, difficulty in timely detection and large-area monitoring, insufficient data monitoring accuracy, and few detection points, which cannot achieve full coverage. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydrogen bottle and a health monitoring method thereof to solve the problems in the prior art.

[0005] To this end, the present invention provides a hydrogen bottle, comprising: a bottle body, wherein a weakened zone is provided at a specific position of the bottle body, wherein the weakened zone is the weakest position area of ​​the bottle body designed to concentrate defects for facilitating health monitoring;

[0006] The bottle body comprises an inner liner layer, a carbon fiber winding layer is provided on the outside of the inner liner layer, and a protective layer is provided on the outside of the carbon fiber winding layer;

[0007] Sensor 1, the sensor 1 is arranged on the outside of the liner layer and distributed throughout the weakened zone area, and the sensor 1 is used to detect stress and strain values ​​at corresponding positions;

[0008] Sensor 2, the sensor 2 is arranged between the carbon fiber winding layer and the protective layer, and the sensor 2 is distributed in the entire weakened zone area, the sensor 1 is electrically connected to the sensor 2, and the sensor 2 is used to measure the quality of the carbon fiber.

[0009] As a further description of the above technical solution, the specific position is the head transition area of ​​the bottle body.

[0010] As a further description of the above technical solution, the weakened zone is an annular weakened zone, and the design strength of the weakened zone is 95%-98% of the average design strength of the bottle body.

[0011] As a further description of the above technical solution, the number of carbon fiber winding layers in the weakened zone area is smaller than the number of carbon fiber winding layers in the non-weakened zone area of ​​the bottle body.

[0012] As a further description of the above technical solution, there is a deviation between the winding angle of the carbon fiber winding layer in the weakened zone area and the winding angle of the carbon fiber winding layer in the non-weakened zone area of ​​the bottle body.

[0013] As a further description of the above technical solution, the winding angle deviation is ±10°.

[0014] As a further description of the above technical solution, the width of the weakened zone is 1%-3% of the diameter of the bottle body.

[0015] As a further description of the above technical solution, the sensor 1 is a flexible circuit board, and a strain gauge is integrated on the circuit board;

[0016] The second sensor is an optical fiber sensor.

[0017] A method for monitoring the health of a hydrogen bottle is also provided, comprising the following steps:

[0018] S100: Qualified hydrogen cylinders are put into use and are charged and discharged under standard pressure;

[0019] S200, sensor 1 detects the stress and strain value of the weakened zone and determines whether the stress and strain value is greater than a preset warning value 1. If so, the process proceeds to step S300, otherwise, the process remains at step S100;

[0020] S300, sensor 2 measures whether the carbon fiber mass is less than the preset warning value 2, if so, proceed to step S400, if not, keep in step S100;

[0021] At S400, the instrument will sound an alarm and remind you to lower the maximum pressure of the hydrogen cylinder charging and discharging cycle, and then perform the charging and discharging cycle at the current maximum pressure;

[0022] S500, repeat steps S200-S400 until the hydrogen bottle is reminded to stop using.

[0023] As a further description of the above technical solution, in step S500, the maximum pressure of the charging and discharging cycle decreases at a preset gradient, and at different maximum pressures of the charging and discharging cycle, the instrument displays different alarm information.

[0024] Beneficial effects:

[0025] 1. The present invention provides a hydrogen bottle and a health monitoring method thereof. By presetting a weakened zone on the hydrogen bottle, the weakened zone serves as the weakest design strength area on the hydrogen bottle, which can concentrate defects for easy detection. At the same time, stress and strain sensors and optical fiber sensors are distributed at multiple points on the weakened zone to perform dual real-time detection of the regional stress and strain values ​​of the weakened zone and the carbon fiber quality. Based on the comparison of the detection data with the preset threshold value, a multi-level warning is triggered, and the hydrogen bottle charging and discharging cycle is dynamically adjusted, thereby solving the problems of difficult defect monitoring and rough life prediction of traditional hydrogen bottles, and providing technical support for the safe and efficient use of high-pressure hydrogen storage containers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is an axial cross-sectional view of the hydrogen bottle provided by the present invention.

[0028] Figure 2 This is a top view of the hydrogen bottle provided by the present invention.

[0029] Figure 3 This is a cross-sectional view of the weakened zone area of ​​the hydrogen bottle provided by the present invention.

[0030] Figure 4 This is an enlarged cross-sectional view of the weakened zone area of ​​the hydrogen bottle provided by the present invention.

[0031] Figure 5 This is a flow chart of the hydrogen bottle health monitoring method provided by the present invention.

[0032] Figure 6 This is a specific flow chart of the hydrogen bottle health monitoring method provided by the present invention.

[0033] In the figure: 1. Bottle body; 2. Carbon fiber wrapping layer; 3. Protective layer; 4. Sensor 1; 5. Sensor 2; 6. Weakened strip; 7. Inner liner layer. DETAILED DESCRIPTION

[0034] The present invention may be more readily understood by referring to the following detailed description of preferred embodiments of the present invention and the included Examples. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. In the event of a conflict, the definitions in this specification shall prevail.

[0035] The present invention provides a hydrogen bottle and a health monitoring method thereof, which solves the problems in the prior art of difficulty in detecting the defective position of the hydrogen bottle, resulting in hydrogen bottle failure affecting vehicle safety, and the difficulty and high cost of global layout when using external monitoring devices for monitoring. At the same time, the existing detection cannot provide comprehensive coverage, resulting in the uncontrollable service life of the hydrogen bottle and the inability to effectively predict the risks of hydrogen bottle use.

[0036] The technical concept of the present invention is to preset a weakened zone on the hydrogen bottle. The weakened zone is the weakest area in the design strength on the hydrogen bottle, which can concentrate defects for easy detection. At the same time, stress and strain sensors and optical fiber sensors are distributed at multiple points on the weakened zone to perform dual real-time detection of the regional stress and strain values ​​of the weakened zone and the carbon fiber quality. Based on the comparison of the detection data with the preset threshold, multi-level warnings are triggered, and the hydrogen bottle charging and discharging cycle is dynamically adjusted, which solves the problems of difficult defect monitoring and rough life prediction of traditional hydrogen bottles, and provides technical support for the safe and efficient use of high-pressure hydrogen storage containers.

[0037] like Figure 1 As shown, a hydrogen bottle comprises: a bottle body 1, a weakened zone 6 is provided at a specific position of the bottle body 1, and the weakened zone 6 is the weakest position area of ​​the bottle body 1 designed for concentrating defects for the convenience of health monitoring; it can be understood that since the weakened zone 6 is the weakest position of the bottle body 1, when the hydrogen bottle appears, it will be concentrated at the position of the weakened zone 6. By providing a detection unit on the weakened zone 6, it is easier to detect defects at a defined defect position.

[0038] The bottle body 1 includes an inner liner layer 7, a carbon fiber winding layer 2 is provided on the outside of the inner liner layer 7, and a protective layer 3 is provided on the outside of the carbon fiber winding layer 2. The protective layer 3 is a glass fiber winding protective layer 3, which can effectively protect the carbon fiber winding layer 2;

[0039] Sensor 1 4, optionally, sensor 1 4 is a stress and strain sensor, the sensor 1 4 is arranged on the outside of the liner layer 7, and the sensor 1 4 is distributed throughout the weakened zone 6, and the sensor 1 4 is used to detect the stress and strain value of the corresponding position;

[0040] Sensor 2 5, optionally, sensor 2 5 is a fiber optic sensor, the sensor 2 is arranged between the carbon fiber winding layer 2 and the protective layer 3, and the sensor 2 5 is distributed in the entire weakened zone 6 area, the sensor 1 4 is electrically connected to the sensor 2, and the sensor 2 5 is used to measure the quality of the carbon fiber.

[0041] In summary, by arranging the outside of the carbon fiber winding layer 2 corresponding to the weakened zone 6 of the hydrogen bottle, a distributed multi-point arrangement scheme is adopted to cover the range of the weakened zone 6, the quality status of the carbon fiber is monitored in real time, and a dual parameter judgment is formed with the stress and strain sensor to accurately identify the health of the hydrogen bottle structure.

[0042] Optionally, the weakened zone 6 is located at the specific location of the bottle body 1's head transition zone. Specifically, due to its geometric discontinuity, the head transition zone generates stress concentration under internal pressure, making it a structurally weak and vulnerable area. Placing the weakened zone 6 at this location can leverage its inherent stress concentration properties, causing potential defects of the hydrogen bottle (such as fatigue damage and structural deformation) to manifest preferentially in this area. In other feasible embodiments, the weakened zone 6 can also be located at the base of the bottle body 1's mouth.

[0043] Alternatively, as Figure 2 As shown by the dashed line, the weakened zone 6 is an annular weakened zone 6, and its design strength is 95%-98% of the average design strength of the bottle body 1. The number of carbon fiber winding layers 2 in the weakened zone 6 area is less than that in the area of ​​the bottle body 1 without the weakened zone 6. Furthermore, the winding angle of the carbon fiber winding layers 2 in the weakened zone 6 area deviates from that in the area of ​​the bottle body 1 without the weakened zone 6, for example, by ±10°. This ensures that the design strength of the weakened zone 6 is at the weakest point of the hydrogen bottle body 1, concentrating defects at the weakened zone 6.

[0044] Optionally, the width of the weakened zone 6 is 1%-3% of the diameter of the bottle body 1 to prevent the strength of the entire hydrogen bottle from being affected due to the width of the weakened zone 6 being too wide.

[0045] Optionally, sensor 1 4 is a flexible circuit board with strain gauges integrated thereon. Specifically, the strain gauges integrated on the flexible circuit board are embedded in the outer side of the inner liner corresponding to the weakened zone 6, and are fully bonded and arranged in the entire weakened zone 6 area;

[0046] The second sensor 5 is a fiber optic sensor. Specifically, a distributed fiber optic sensor is arranged outside the carbon fiber winding layer 2 corresponding to the weakened zone 6. A distributed multi-point arrangement scheme is adopted to cover the carbon fiber monitoring within the weakened zone 6.

[0047] Through a large number of pressure alternating tests and combined with actual hydrogen bottle usage scenarios, the hydrogen bottle full life cycle health management strategy is developed, as shown in the figure. After monitoring the health status of the hydrogen bottle, actual feedback is given to the hydrogen bottle console, and the goal of long-life use of the hydrogen bottle is achieved by recommending the hydrogen bottle inflation pressure.

[0048] A hydrogen bottle health monitoring method is also provided, and the specific steps include:

[0049] S100: Qualified hydrogen cylinders are put into use and are charged and discharged under standard pressure;

[0050] S200, sensor 1 4 detects the stress and strain value of the weakened zone 6, and determines whether the stress and strain value is greater than the preset warning value 1. If so, the process proceeds to step S300, otherwise, the process remains at step S100;

[0051] S300, sensor 2 5 measures whether the carbon fiber mass is less than the preset warning value 2, if so, proceed to step S400, if not, keep in step S100;

[0052] At S400, the instrument will sound an alarm and remind you to lower the maximum pressure of the hydrogen cylinder charging and discharging cycle, and then perform the charging and discharging cycle at the current maximum pressure;

[0053] S500, repeat steps S200-S400 until the hydrogen bottle is reminded to stop using. At the same time, in step S500, the maximum pressure of the charging and discharging cycle decreases at a preset gradient. At the same time, at different maximum pressures of the charging and discharging cycle, the instrument displays different alarm information.

[0054] In summary, during the use of hydrogen cylinders, stress and strain values ​​and carbon fiber quality are continuously monitored. When any parameter exceeds the corresponding warning threshold, the maximum pressure of the charge and discharge cycle is reduced, and the cycle detection is restarted. If the threshold is still not met under the red warning, the hydrogen cylinder is determined to be out of use. By detecting the different health states of the hydrogen cylinder and adjusting the filling pressure of the hydrogen cylinder in a timely manner, the service life of the hydrogen cylinder can be extended, which can greatly reduce the cost of using the hydrogen cylinder.

[0055] Optionally, in one embodiment, the specific steps of the hydrogen bottle health monitoring method include:

[0056] S100: Qualified hydrogen cylinders are put into use and enter the hydrogen cylinder charging and discharging cycle under standard pressure;

[0057] S200, real-time detection of stress and strain sensors;

[0058] S300, comparing the stress and strain value with the warning value 1. If the stress and strain value exceeds the warning value 1, the distributed optical fiber sensor measurement is enabled. If the stress and strain value does not exceed the warning value 1, the process continues with S100.

[0059] S400, distributed fiber optic sensor measurement;

[0060] S500, the fiber optic sensor measures the carbon fiber mass and compares it with the target value 1. If it is less than the target value 1, the process proceeds to the next state. If it exceeds the target value 1, the process proceeds to S100.

[0061] S600, the instrument displays a blue warning for the hydrogen tank, reminding you to adjust the hydrogen tank filling pressure to 90% of the standard value;

[0062] S700, comparing the stress and strain value with the warning value 2. If the stress and strain value exceeds the warning value 2, the distributed optical fiber sensor measurement is enabled. If the stress and strain value does not exceed the warning value, the process continues with S600.

[0063] S800, distributed fiber optic sensor measurement;

[0064] S900, the fiber optic sensor measures the carbon fiber mass and compares it with the target value 2. If it is less than the target value 2, the process proceeds to the next state. If it exceeds the target value, the process proceeds to S600.

[0065] S1000, the instrument displays a yellow warning for the hydrogen tank, reminding you to adjust the hydrogen tank filling pressure to 80% of the standard value;

[0066] S1100, the stress and strain value is compared with the warning value 3. If it exceeds the warning value 3, the distributed optical fiber sensor measurement is enabled. If it does not exceed the warning value, the process continues with S1000;

[0067] S1200, distributed fiber optic sensor measurement;

[0068] S1300, the fiber optic sensor measures the carbon fiber mass and compares it with the target value 3. If it is less than the target value 3, the process proceeds to the next state. If it exceeds the target value, the process proceeds to S1000.

[0069] S1400, the instrument displays an orange warning for the hydrogen tank, reminding you to adjust the hydrogen tank filling pressure to 70% of the standard value;

[0070] S1500: Compare the stress and strain values ​​with the warning value 4. If the stress and strain values ​​exceed the warning value 4, the distributed optical fiber sensor measurement is enabled. If the stress and strain values ​​do not exceed the warning value 4, the process proceeds to S1400.

[0071] S1600, distributed fiber optic sensor measurement;

[0072] S1700, the fiber optic sensor measures the carbon fiber mass and compares it with the target value 4. If it is less than the target value 4, the process proceeds to the next state. If it exceeds the target value, the process continues to S1400.

[0073] S1800, the instrument displays a red warning for the hydrogen tank, reminding you to adjust the hydrogen tank filling pressure to 50% of the standard value;

[0074] S1900, The hydrogen bottle has reached the end of its life and should be discontinued.

[0075] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydrogen bottle, characterized in that: include: The bottle body is provided with a weakened zone at a specific position of the bottle body. The weakened zone is the weakest position area of ​​the bottle body designed to concentrate defects for health monitoring; The bottle body comprises an inner liner layer, a carbon fiber winding layer is provided on the outside of the inner liner layer, and a protective layer is provided on the outside of the carbon fiber winding layer; Sensor 1, the sensor 1 is arranged on the outside of the liner layer and distributed throughout the weakened zone area, and the sensor 1 is used to detect stress and strain values ​​at corresponding positions; Sensor 2, the sensor 2 is arranged between the carbon fiber winding layer and the protective layer, and the sensor 2 is distributed in the entire weakened zone area, the sensor 1 is electrically connected to the sensor 2, and the sensor 2 is used to measure the quality of the carbon fiber.

2. The hydrogen bottle according to claim 1, characterized in that: The specific position is the transition area of ​​the bottle head.

3. The hydrogen bottle according to claim 1, characterized in that: The weakened zone is an annular weakened zone, and the design strength of the weakened zone is 95%-98% of the average design strength of the bottle body.

4. The hydrogen bottle according to claim 1, characterized in that: The number of carbon fiber winding layers in the weakened zone area is smaller than the number of carbon fiber winding layers in the non-weakened zone area of ​​the bottle body.

5. The hydrogen bottle according to claim 1, characterized in that: There is a deviation between the winding angle of the carbon fiber winding layer in the weakened zone area and the winding angle of the carbon fiber winding layer in the non-weakened zone area of ​​the bottle body.

6. The hydrogen bottle according to claim 5, characterized in that: The winding angle deviation is ±10°.

7. The hydrogen bottle according to claim 1, characterized in that: The width of the weakened zone is 1%-3% of the diameter of the bottle body.

8. The hydrogen bottle according to claim 1, characterized in that: The first sensor is a flexible circuit board with a strain gauge integrated thereon; The second sensor is an optical fiber sensor.

9. A method for monitoring the health of a hydrogen bottle, characterized in that the steps include: S100: Qualified hydrogen cylinders are put into use and are charged and discharged under standard pressure; S200, sensor 1 detects the stress and strain value of the weakened zone and determines whether the stress and strain value is greater than a preset warning value 1. If so, the process proceeds to step S300, otherwise, the process remains at step S100; S300, sensor 2 measures whether the carbon fiber mass is less than the preset warning value 2, if so, proceed to step S400, if not, keep in step S100; At S400, the instrument will sound an alarm and remind you to lower the maximum pressure of the hydrogen cylinder charging and discharging cycle, and then perform the charging and discharging cycle at the current maximum pressure; S500, repeat steps S200-S400 until the hydrogen bottle is reminded to stop using.

10. The hydrogen bottle health monitoring method according to claim 9, characterized in that: In step S500, the maximum pressure of the charge and discharge cycle decreases at a preset gradient, and at different maximum pressures of the charge and discharge cycle, the instrument displays different alarm information.

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