Hydrogen fuel cell, waist collapse detection system, waist collapse detection method and engineering machinery
By arranging the waist-slump detection protrusions in the conductive housing of the hydrogen fuel cell, the changes in insulation resistance value of the stack assembly are monitored in real time, and the high cost and low timeliness of waist-slump detection in the prior art are solved, and efficient and safe waist-slump detection and prediction are achieved.
Patent Information
- Application Number
- CN202510643426.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-19
- Publication Date
- 2025-07-18
AI Technical Summary
In the prior art, the waist-slump detection of hydrogen fuel cells requires dismantling modules for destructive testing, resulting in high operation and maintenance costs, poor timeliness and the inability to predict the risk of waist-slump, especially for high-power long stacks.
A waist-deep detection protrusion is arranged in the conductive housing of the hydrogen fuel cell, and the waist-deep collapse condition is judged by detecting the change in the insulation resistance value of the stack assembly, and the insulation monitoring module and control module are used to achieve real-time monitoring and shutdown protection.
The problem of waist collapse can be detected without disassembling the hydrogen fuel cell, improve detection efficiency, reduce maintenance costs, and predict the risk of structural failure in a timely manner to avoid catastrophic failures.
Smart Images
Figure CN120341319A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of new energy technologies, and particularly relates to a hydrogen fuel cell, a collapse detection system, a detection method, and construction machinery. Background Art
[0002] As an efficient clean energy conversion device, a hydrogen fuel cell stack realizes high-voltage output through a series structure of multiple battery units. It is usually composed of core components such as membrane electrodes, bipolar plates, and seals, and adopts a modular structure formed by a current collector plate, an end plate, and a screw / steel belt encapsulation process, with a protective conductive housing configured externally to meet the requirements of waterproof and dustproof. With the development of high-power stacks towards high unit density and long axial dimensions, the axial collapse (waist collapse) phenomenon caused by the attenuation of the encapsulation pre-tightening force, material creep, and external vibration and impact inside the stack becomes increasingly significant. This deformation not only causes an imbalance in the pressure distribution at the contact interface between the bipolar plate and the membrane electrode, leading to safety hazards such as hydrogen leakage and coolant leakage, but also results in performance degradation problems such as an increase in contact resistance and uneven current density distribution, severely restricting the service life of the stack and the reliability of the system.
[0003] Existing technologies mostly focus on the optimized design of the encapsulation structure, such as improving the stiffness of the end plate or optimizing the layout of fasteners. Although it can delay the occurrence of waist collapse, it cannot fundamentally eliminate it. Since the stack is completely encapsulated inside a closed conductive housing, traditional detection methods require disassembling the module for destructive testing, which has defects such as high operation and maintenance costs and poor timeliness. Especially for high-power long stacks, there is a lack of effective detection means, which further leads to the inability to predict the risk of structural failure and may cause catastrophic failures under sudden working conditions. Summary of the Invention
[0004] The purpose of this application is to provide a hydrogen fuel cell, a collapse detection system, a detection method, and construction machinery, which are used to solve the problems of high operation and maintenance costs, poor timeliness, and inability to predict the waist collapse risk in the prior art for the waist collapse problem of fuel cells that require disassembly and detection.
[0005] To achieve the above purpose, in the first aspect of this application, a hydrogen fuel cell is provided, including:
[0006] A conductive housing;
[0007] A stack assembly, arranged inside the conductive housing, and both ends of the stack assembly in its own length direction are respectively installed on the inner side wall of the conductive housing through end plates;
[0008] Current collector plates, one current collector plate is respectively provided at both ends of the stack assembly in its own length direction, and one end of the current collector plate extends outside the conductive housing and is in insulating cooperation with the conductive housing;
[0009] The collapse detection protrusion is arranged on the bottom wall of the conductive housing and forms an electrical connection with the conductive housing; the collapse detection protrusion is arranged below corresponding to the middle region of the stack assembly; and / or, the collapse detection protrusion is arranged in the middle region of the stack assembly and on the side facing the bottom wall of the conductive housing, and the collapse detection protrusion forms an electrical connection with the corresponding electrode plate in the stack assembly.
[0010] As a further improvement of the above technical solution:
[0011] In some possible implementation manners, define the height of the collapse detection protrusion as h, the distance from the middle region of the stack assembly to the bottom wall of the conductive housing as L1, and the maximum allowable collapse amount of the middle region of the stack assembly as L2;
[0012] Wherein, h satisfies: h≥L1 - L2.
[0013] In some possible implementation manners, the top of the collapse detection protrusion is used to form a point contact, surface contact or line contact fit with the stack assembly.
[0014] In some possible implementation manners, the collapse detection protrusion is a conductive material part, and the conductive material part includes a metal conductive material part or a non-metal conductive material part;
[0015] Wherein, the metal conductive material part includes an aluminum alloy material, a copper material, a brass material, a silver material, a nickel alloy material or a titanium alloy material;
[0016] The non-metal conductive material part includes a carbon fiber composite material, a conductive polymer material, a graphite material, a metal matrix composite material or a conductive ceramic material.
[0017] In some possible implementation manners, the collapse detection protrusion is arranged on the bottom wall of the conductive housing;
[0018] Wherein, the collapse detection protrusion is connected to the bottom wall of the conductive housing by welding, screw connection or is an integral structure.
[0019] In some possible implementation manners, the collapse detection protrusion is arranged on the stack assembly;
[0020] Wherein, the collapse detection protrusion and the corresponding electrode plate in the stack assembly are of an integral structure.
[0021] The second aspect of the present application provides a collapse detection system, including an insulation monitoring module, a control module and a hydrogen fuel cell provided according to the first aspect above;
[0022] The insulation monitoring module is electrically connected to the conductive housing and the current collector plate, and is used to detect the change in the insulation resistance value of the stack assembly in real time;
[0023] The control module is configured to send a collapse signal and a power supply stop signal when the insulation resistance value of the stack assembly is less than a first preset safety value.
[0024] A third aspect of the present application provides a collapse detection method, which applies the collapse detection system provided in the second aspect above. The collapse detection method includes:
[0025] Detect the change in the insulation resistance value of the stack assembly in real time through the insulation monitoring module;
[0026] When the insulation resistance value of the stack assembly is less than a first preset safety value, send a collapse signal and a power supply stop signal.
[0027] As a further improvement of the above technical solution:
[0028] In some possible implementation manners, the collapse detection method further includes:
[0029] Detect the insulation resistance value of the stack assembly before starting the hydrogen fuel cell;
[0030] When the insulation resistance value of the stack assembly is less than a second preset safety value, send a collapse signal and a start-up stop signal, where the second preset safety value is greater than or equal to the first preset safety value.
[0031] A fourth aspect of the present application further provides a construction machinery, including the collapse detection system provided in the second aspect above.
[0032] Compared with the prior art, the hydrogen fuel cell, collapse detection system, detection method and construction machinery provided by the present application at least include the following beneficial effects:
[0033] The hydrogen fuel cell provided by the present application arranges collapse detection protrusions in the conductive housing. When the stack assembly collapses, the middle area of the stack assembly will protrude towards the bottom wall of the conductive housing. When the protrusion of the middle area of the stack assembly reaches a certain degree, electrical conduction is achieved between the stack assembly and the conductive housing through the collapse detection protrusions. At this time, the circuit formed by the stack assembly and the current collector plates of the positive and negative electrodes is disconnected, resulting in a sharp drop in the insulation resistance value of the stack assembly. In this way, it is possible to judge whether the hydrogen fuel cell has a collapse problem by detecting the change in the insulation resistance value of the stack assembly, so there is no need to disassemble the hydrogen fuel cell, which greatly improves the detection efficiency and reduces the maintenance cost.
[0034] Applied in the slumping detection system, the insulation resistance value change of the stack assembly is detected in real time through the insulation monitoring module. When the insulation resistance value of the stack assembly is less than the first preset safety value, a slumping signal and a power supply stop signal are issued. In this way, the slumping condition of the hydrogen fuel cell during use can be monitored in real time, and thus the risk of structural failure can be predicted in time to avoid catastrophic failures.
[0035] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation to the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts. In the drawings:
[0037] Figure 1 FIG. 12 is a schematic structural diagram of a hydrogen fuel cell when the stack assembly is not slumped according to Embodiment 1 of the present application;
[0038] Figure 2 FIG. 16 is a schematic structural diagram of a first hydrogen fuel cell with the stack assembly in a slumped state inside according to Embodiment 1 of the present application;
[0039] Figure 3 FIG. 20 is a schematic structural diagram of a second hydrogen fuel cell with the stack assembly in a slumped state inside according to Embodiment 1 of the present application;
[0040] Figure 4 FIG. 24 is a schematic structural diagram of a third hydrogen fuel cell with the stack assembly in a slumped state inside according to Embodiment 1 of the present application;
[0041] Figure 5 FIG. 28 is a schematic structural diagram of a fourth hydrogen fuel cell with the stack assembly in a slumped state inside according to Embodiment 1 of the present application;
[0042] Figure 6 FIG. 32 is a schematic structural diagram of a fifth hydrogen fuel cell with the stack assembly in a slumped state inside according to Embodiment 1 of the present application;
[0043] Figure 7 FIG. 36 is a schematic structural diagram of a hydrogen fuel cell when the stack assembly is not slumped according to Embodiment 2 of the present application;
[0044] Figure 8 FIG. 40 is another schematic structural diagram of a hydrogen fuel cell when the stack assembly is not slumped according to Embodiment 2 of the present application;
[0045] Figure 9 This is a schematic structural diagram of the first internal stack assembly of the hydrogen fuel cell provided in the second embodiment of the present application in a waist-collapsed state;
[0046] Figure 10 This is a schematic structural diagram of one of the electrode plates in the battery unit in the middle region of the stack assembly provided in the second embodiment of the present application;
[0047] Figure 11 This is a schematic structural diagram of another electrode plate provided in the second embodiment of the present application;
[0048] Figure 12 This is a schematic structural diagram of yet another electrode plate provided in the second embodiment of the present application.
[0049] Explanation of reference numerals
[0050] 100, stack assembly; 110, electrode plate; 200, current collector plate; 300, end plate; 310, insulating partition; 400, conductive housing; 500, waist-collapse detection protrusion. Detailed implementation manners
[0051] The following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application.
[0052] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with exemplary embodiments.
[0053] Embodiment 1
[0054] Please refer to Figure 1 and Figure 2 , this embodiment provides a hydrogen fuel cell, which can be applied to construction machinery.
[0055] The hydrogen fuel cell provided in this embodiment includes: a conductive housing 400, a stack assembly 100, a current collector plate 200, and a waist-collapse detection protrusion 500. Among them, the conductive housing 400 is a conductive metal component, and an accommodation space for accommodating the stack assembly 100, the current collector plate 200, and the waist-collapse detection protrusion 500 is provided inside the conductive housing 400.
[0056] The stack assembly 100 is arranged inside the conductive housing 400. The two ends of the stack assembly 100 in its own length direction are respectively installed on the inner side walls of the conductive housing 400 through end plates 300. One current collector plate 200 is provided at each of the two ends of the stack assembly 100 in its own length direction. One end of the current collector plate 200 extends outside the conductive housing 400 and is insulated from the conductive housing 400. Insulation is achieved by providing an insulating member between the current collector plate 200 and the conductive housing 400 to prevent the current collector plate 200 from being electrically connected to the conductive housing 400.
[0057] In this embodiment, the collapse detection protrusion 500 is arranged on the bottom wall of the conductive shell 400 and forms a conductive connection with the conductive shell 400. In other words, current transmission can be achieved between the collapse detection protrusion 500 and the conductive shell 400, that is, it is conductive, and can be directly connected (for example, the two are in direct abutment contact) or indirectly connected (for example, connected by a wire); wherein, the collapse detection protrusion 500 is arranged at the bottom corresponding to the middle area of the battery stack assembly 100.
[0058] It should be noted that as the number and length of the battery stack increase, the battery stack will inevitably collapse due to the attenuation of the battery stack packaging force and the vibration impact, and the greater the power of the battery stack and the longer the length, the more serious the collapse. Normally, when the battery stack assembly 100 collapses, the overall displacement of the battery stack assembly 100 is generally parabolic, wherein the position of the maximum absolute displacement occurs in the middle area of the battery stack assembly 100, and at this time the middle area of the battery stack assembly 100 bulges toward the bottom wall of the conductive shell. Therefore, the collapse detection protrusion 500 is arranged below corresponding to the middle area of the battery stack assembly 100, so that the collapse can be better detected.
[0059] In some embodiments, in order to further improve the insulation between the battery stack assembly 100 and the conductive shell 400 , an insulating partition 310 is provided on a side of the end plate 300 close to the battery stack assembly 100 for insulation isolation.
[0060] Further, the height of the collapse detection protrusion 500 is defined as h, the distance between the middle area of the battery stack assembly 100 and the bottom wall of the conductive housing 400 is defined as L1, and the maximum collapse amount allowed in the middle area of the battery stack assembly 100 is defined as L2. Wherein, h satisfies: h≥L1-L2.
[0061] It can be seen from this that if the current collapse amount of the stack assembly 100 inside the hydrogen fuel cell is L3, when L3<L1-h, the battery cells in the middle area of the stack assembly 100 will not contact the collapse detection protrusion 500, and the hydrogen fuel cell can work normally at this time; when L3≥L1-h, the battery cells in the middle area of the stack assembly 100 contact the collapse detection protrusion 500, and at this time the stack assembly 100 is connected (electrically conductive) to the conductive shell 400 through the collapse detection protrusion 500, thereby causing the insulation resistance between the stack assembly 100 and the conductive shell 400 to drop sharply, thereby causing the stack assembly 100 to collapse through the decrease in insulation resistance, and the degree of collapse has reached the maximum critical level, and an emergency shutdown is required to repair and replace the hydrogen fuel cell.
[0062] Optionally, the waist collapse detection protrusion 500 is made of conductive materials such as aluminum alloy.
[0063] Please also read Figure 3 , Figure 4, Figure 5 and Figure 6 , in some embodiments, the top of the waist-collapse detection protrusion 500 is used to form a point contact, surface contact or line contact fit with the stack assembly 100.
[0064] Optionally, the top shape of the waist-collapse detection protrusion 500 is set to a tip shape, a spherical shape, a spherical segment shape or a planar shape. In this embodiment, the cross-sectional shape of the waist-collapse detection protrusion 500 shows examples of a rectangle, a triangle, a trapezoid and a T-shape. It should be understood that the above are only examples and do not limit the protection scope of the present application.
[0065] It can be understood that setting the top of the waist-collapse detection protrusion 500 to a planar shape is beneficial to increasing the number of contacts and the contact area with the battery cells on the stack assembly 100 during waist collapse, thereby improving the sensitivity of detection.
[0066] In some embodiments, the waist-collapse detection protrusion 500 is made of a conductive material, and the conductive material includes a metal-based conductive material or a non-metal-based conductive material.
[0067] Among them, the metal-based conductive material includes aluminum alloy material, copper material, brass material, silver material, nickel alloy material or titanium alloy material; the non-metal-based conductive material includes carbon fiber composite material, conductive polymer material, graphite material, metal matrix composite material or conductive ceramic material. It should be understood that the above are only examples and do not limit the protection scope of the present application.
[0068] In some embodiments, the waist-collapse detection protrusion 500 is welded to, screwed to or integrally formed with the bottom wall of the conductive housing 400 (such as stamping or integral casting). It should be understood that the above are only examples and do not limit the protection scope of the present application.
[0069] The hydrogen fuel cell provided in this embodiment arranges the waist-collapse detection protrusion 500 inside the conductive housing 400. After the stack assembly 100 collapses, the middle area of the stack assembly 100 will bulge towards the bottom wall of the conductive housing 400. When the bulge of the middle area of the stack assembly 100 reaches a certain degree, electrical conduction is achieved between the stack assembly 100 and the conductive housing 400 through the waist-collapse detection protrusion 500. At this time, the circuit formed by the stack assembly 100 and the current collectors 200 of the positive and negative electrodes is disconnected, resulting in a sharp drop in the insulation resistance value of the stack assembly 100. In this way, it is possible to judge whether the hydrogen fuel cell has a waist-collapse problem by detecting the change in the insulation resistance value of the stack assembly 100, so there is no need to disassemble the hydrogen fuel cell, greatly improving the detection efficiency and reducing the maintenance cost. Moreover, the hydrogen fuel cell provided in this embodiment only adds the waist-collapse detection protrusion 500 on the bottom wall of the conductive housing 400 to achieve waist-collapse detection, with a simple structure and low cost.
[0070] Embodiment 2
[0071] See also Figure 7 and Figure 8 , this embodiment provides a hydrogen fuel cell that can be used in engineering machinery.
[0072] The hydrogen fuel cell provided in this embodiment includes: a conductive shell 400, a stack assembly 100, a current collecting plate 200 and a collapse detection protrusion 500. The conductive shell 400 is a conductive metal material, and a space for accommodating the stack assembly 100, the current collecting plate 200 and the collapse detection protrusion 500 is provided inside the conductive shell 400.
[0073] The stack assembly 100 is arranged in the conductive housing 400, and the two ends of the stack assembly 100 in the length direction are respectively mounted on the inner wall of the conductive housing 400 through the end plates 300. A current collecting plate 200 is respectively provided at the two ends of the stack assembly 100 in the length direction, and one end of the current collecting plate 200 extends outside the conductive housing 400 and is insulated from the conductive housing 400. An insulating member is provided between the current collecting plate 200 and the conductive housing 400 for insulation to prevent the current collecting plate 200 from being conductive to the conductive housing 400.
[0074] See also Figure 7 , Figure 8 and Figure 9 In this embodiment, the waist collapse detection protrusion 500 is arranged in the middle area of the battery stack assembly 100 and is located on the side facing the bottom wall of the conductive shell 400. The waist collapse detection protrusion 500 forms a conductive connection with the corresponding electrode plate 110 in the battery stack assembly 100. Specifically, the waist collapse detection protrusion 500 is provided on at least one battery cell located in the middle area of the battery stack assembly 100.
[0075] It should be noted that as the number and length of the battery stack increase, the battery stack will inevitably collapse due to the attenuation of the battery stack packaging force and the vibration impact, and the greater the power of the battery stack and the longer the length, the more serious the collapse. Normally, when the battery stack assembly 100 collapses, the overall displacement of the battery stack assembly 100 is generally parabolic, wherein the position of the maximum absolute displacement occurs in the middle area of the battery stack assembly 100, and at this time, the middle area of the battery stack assembly 100 protrudes toward the bottom wall of the conductive shell. Therefore, the collapse detection protrusion 500 is arranged in the middle area of the battery stack assembly 100 and is located on the side facing the bottom wall of the conductive shell 400, so as to better detect the collapse.
[0076] Further, define the height of the lumbar collapse detection protrusion 500 as h, the distance from the middle region of the stack assembly 100 to the bottom wall of the conductive housing 400 as L1, and the maximum allowable lumbar collapse amount of the middle region of the stack assembly 100 as L2. Among them, h satisfies: h ≥ L1 - L2.
[0077] It can be seen that if the current lumbar collapse amount of the stack assembly 100 inside the hydrogen fuel cell is L3, when L3 < L1 - h, the lumbar collapse detection protrusion 500 in the middle region of the stack assembly 100 will not contact the bottom wall of the conductive housing 400, and at this time, the hydrogen fuel cell can work normally; when L3 ≥ L1 - h, the lumbar collapse detection protrusion 500 on the battery cells in the middle region of the stack assembly 100 contacts the bottom wall of the conductive housing 400. At this time, the battery cells of the stack assembly 100 are conducted (electrically conducted) with the conductive housing 400 through the lumbar collapse detection protrusion 500, resulting in a sharp drop in the insulation resistance value between the stack assembly 100 and the conductive housing 400. Thus, it is judged through the drop in the insulation resistance value and it is reminded that the stack assembly 100 may have a lumbar collapse, and the degree of lumbar collapse has reached the maximum critical level, and emergency shutdown is required to repair and replace the hydrogen fuel cell.
[0078] Optionally, the lumbar collapse detection protrusion 500 and the electrode plate 110 in the battery cell are of an integral structure, such as a stamping or machining integral structure. It should be understood that the above is only an example and does not limit the protection scope of the present application.
[0079] In some embodiments, the top of the lumbar collapse detection protrusion 500 is used to form a point contact, surface contact or line contact fit with the bottom wall of the conductive housing 400.
[0080] Please refer to Figure 10 、 Figure 11 and Figure 12 , optionally, the top shape of the lumbar collapse detection protrusion 500 is set to a tip shape, spherical shape, spherical segment shape or planar shape. In this embodiment, the side view shape of the lumbar collapse detection protrusion 500 shows examples of a rectangle, trapezoid and semi-circle. It should be understood that the above is only an example and does not limit the protection scope of the present application.
[0081] It can be understood that setting the top of the lumbar collapse detection protrusion 500 to a planar shape is beneficial to increasing the contact area during lumbar collapse and improving sensitivity.
[0082] In some embodiments, the hydrogen fuel cell solutions provided in the above-mentioned Embodiment 1 and Embodiment 2 can be combined. That is to say, a lumbar collapse detection protrusion 500 is provided on the side of the battery cell facing the bottom wall of the conductive housing 400, and at the same time, a lumbar collapse detection protrusion 500 is also provided on the bottom wall of the conductive housing 400 in a corresponding position. Among them, the sum of the heights of the two corresponding lumbar collapse detection protrusions 500 is h, and h also satisfies: h ≥ L1 - L2.
[0083] In this embodiment, the hydrogen fuel cell provided is equipped with a waist-collapse detection protrusion 500 on the battery cells in the middle region of the stack assembly 100. When the stack assembly 100 experiences waist-collapse, the middle region of the stack assembly 100 will bulge towards the bottom wall of the conductive housing 400. When the bulge in the middle region of the stack assembly 100 reaches a certain degree, electrical conduction is achieved between the stack assembly 100 and the conductive housing 400 through the waist-collapse detection protrusion 500. At this time, the circuit formed by the stack assembly 100 and the current collectors 200 of the positive and negative electrodes is disconnected, resulting in a sharp drop in the insulation resistance value of the stack assembly 100. In this way, it is possible to determine whether the hydrogen fuel cell has a waist-collapse problem by detecting the change in the insulation resistance value of the stack assembly 100, thus eliminating the need to disassemble the hydrogen fuel cell, greatly improving the detection efficiency and reducing the maintenance cost. Moreover, the hydrogen fuel cell provided in this embodiment only needs to be equipped with a waist-collapse detection protrusion 500 on the battery cells in the middle region of the stack assembly 100 to achieve waist-collapse detection, with a simple structure and low cost.
[0084] Embodiment Three
[0085] Please refer to Figures 1 to 12 , this embodiment provides a waist-collapse detection system, especially a waist-collapse detection system suitable for hydrogen fuel cells. Among them, the waist-collapse detection system can be applied to construction machinery.
[0086] The waist-collapse detection system provided in this embodiment includes an insulation monitoring module, a control module, and a hydrogen fuel cell provided according to Embodiment One or Embodiment Two.
[0087] The insulation monitoring module is electrically connected to the conductive housing 400 and the current collector 200, and is used to detect the change in the insulation resistance value of the stack assembly 100 in real time.
[0088] The control module is configured to issue a waist-collapse signal and a power supply stop signal when the insulation resistance value of the stack assembly 100 is less than a first preset safety value.
[0089] Optionally, the control module includes a PLC controller.
[0090] In some embodiments, the insulation monitoring module can measure the change in the insulation resistance value of the stack assembly 100 using the voltage-current method. Specifically as follows:
[0091] Apply a test signal: Apply a known low-voltage DC or AC test voltage U (usually a non-system voltage, such as 5 - 50V, to avoid interfering with the main circuit) between the conductive housing 400 and the current collector 200.
[0092] Measure the leakage current: Measure the leakage current I generated between the two using a high-precision sensor.
[0093] Calculate the insulation resistance: According to Ohm's law \(R = U / I\), calculate the insulation resistance value. The lower the resistance value, the poorer the insulation performance.
[0094] In some other embodiments, the insulation monitoring module can measure the change in the insulation resistance value of the stack assembly 100 by using the bridge balance method. Specifically as follows:
[0095] Construct a bridge circuit: Connect the conductive housing 400 and the current collector plate 200 to two arms of the bridge, and adjust the known resistance to balance the bridge.
[0096] Detect the unbalance signal: When the insulation resistance changes, the bridge becomes unbalanced and a voltage difference signal is generated.
[0097] Dynamically adjust and calculate: Dynamically calculate the change in the insulation resistance according to the degree of unbalance.
[0098] It should be understood that the above two principles for measuring the change in the insulation resistance value of the stack assembly 100 in the insulation monitoring module are only for illustrative purposes and do not limit the protection scope of this application.
[0099] Compared with the prior art, the collapse detection system provided in this embodiment can detect the change in the insulation resistance value of the stack assembly 100 in real time through the insulation monitoring module. When the insulation resistance value of the stack assembly 100 is less than the first preset safety value, a collapse signal and a power-off signal are sent. In this way, the collapse situation of the hydrogen fuel cell during use can be monitored in real time, and thus the risk of structural failure can be predicted in time to avoid catastrophic failures. There is no need to disassemble the hydrogen fuel cell for detection, which improves the maintenance efficiency and ensures the safety of the equipment.
[0100] Furthermore, this embodiment also provides a collapse detection method that applies the above-provided collapse detection system. Among them, the collapse detection method includes the following steps:
[0101] Real-time detect the change in the insulation resistance value of the conductive housing 400 through the insulation monitoring module;
[0102] When the insulation resistance value of the conductive housing 400 is less than the first preset safety value, send a collapse signal and a power-off signal. This is to remind the operator to stop the machine and perform maintenance on the hydrogen fuel cell to ensure the safety of the equipment.
[0103] In this embodiment, the collapse detection method further includes:
[0104] Detect the insulation resistance value of the conductive housing 400 before starting the hydrogen fuel cell;
[0105] When the insulation resistance value of the conductive housing 400 is less than the second preset safety value, send a collapse signal and a start-up stop signal, where the second preset safety value is greater than or equal to the first preset safety value to further improve the safety before starting the machine.
[0106] In this way, self-check of the hydrogen fuel cell is realized before starting the device, ensuring that the hydrogen fuel cell is in a normal state and providing safety guarantee for the subsequent normal operation of the device.
[0107] Furthermore, this embodiment also provides a construction machinery. The construction machinery includes the waist collapse detection system provided above.
[0108] It should be noted that in this application, unless otherwise stated, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.
[0109] In the description of this application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0110] In this application, unless otherwise clearly specified and limited, the terms "install", "connect", "connection", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0111] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0112] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.
Claims
1. A hydrogen fuel cell, characterized in that, Comprising: A conductive housing (400); A stack assembly (100) arranged within the conductive housing (400), with both ends of the stack assembly (100) in its longitudinal direction being respectively mounted on the inner sidewall of the conductive housing (400) through end plates (300); Current collector plates (200), with one current collector plate (200) being respectively provided at both ends of the stack assembly (100) in its longitudinal direction, and one end of the current collector plate (200) extending outside the conductive housing (400) and being in insulating fit with the conductive housing (400); A waist-collapse detection protrusion (500) arranged on the bottom wall of the conductive housing (400) and forming a conductive connection with the conductive housing (400); The waist-collapse detection protrusion (500) is arranged below corresponding to the middle region of the stack assembly (100); and / or, the waist-collapse detection protrusion (500) is arranged in the middle region of the stack assembly (100) and on the side facing the bottom wall of the conductive housing (400), and the waist-collapse detection protrusion (500) forms a conductive connection with the corresponding electrode plate (110) in the stack assembly (100).
2. The hydrogen fuel cell according to claim 1, characterized in that, Define the height of the waist-collapse detection protrusion (500) as h, the distance from the middle region of the stack assembly (100) to the bottom wall of the conductive housing (400) as L1, and the maximum allowable waist-collapse amount of the middle region of the stack assembly (100) as L2; Wherein, h satisfies: h ≥ L1 - L2.
3. The hydrogen fuel cell according to claim 1, wherein The top of the waist-collapse detection protrusion (500) is used to form point contact, surface contact or line contact fit with the stack assembly (100).
4. The hydrogen fuel cell according to claim 1, wherein The waist-collapse detection protrusion (500) is a component made of conductive material, and the component made of conductive material includes a component made of metal conductive material or a component made of non-metal conductive material; Wherein, the component made of metal conductive material includes an aluminum alloy material, a copper material, a brass material, a silver material, a nickel alloy material or a titanium alloy material; The component made of non-metal conductive material includes a carbon fiber composite material, a conductive polymer material, a graphite material, a metal matrix composite material or a conductive ceramic material.
5. The hydrogen fuel cell according to any one of claims 1-4, characterized in that, The waist-collapse detection protrusion (500) is arranged on the bottom wall of the conductive housing (400); Wherein, the waist-collapse detection protrusion (500) is connected to the bottom wall of the conductive housing (400) by welding, screw connection or is an integral structure.
6. The hydrogen fuel cell according to any one of claims 1-4, characterized in that, The waist-collapse detection protrusion (500) is arranged on the stack assembly (100); Wherein, the waist-collapse detection protrusion (500) and the corresponding electrode plate (110) in the stack assembly (100) are an integral structure.
7. A lumbar collapse detection system, characterized in that, Comprising an insulation monitoring module, a control module and a hydrogen fuel cell according to any one of claims 1 - 6; The insulation monitoring module is electrically connected to the conductive housing (400) and the current collector plate (200), and is used to detect the change of the insulation resistance value of the stack assembly (100) in real time; The control module is configured to send a waist-collapse signal and a power supply stop signal when the insulation resistance value of the stack assembly (100) is less than a first preset safety value.
8. A method for detecting a collapsed waist, characterized in that, The collapse detection system according to claim 7 is applied, and the collapse detection method includes: The insulation resistance value change of the stack assembly (100) is detected in real time through the insulation monitoring module; When the insulation resistance value of the stack assembly (100) is less than the first preset safety value, a collapse signal and a power supply stop signal are issued.
9. The slouch detection method according to claim 8, wherein The collapse detection method further includes: Before the hydrogen fuel cell is started, the insulation resistance value of the stack assembly (100) is detected; When the insulation resistance value of the stack assembly (100) is less than the second preset safety value, a collapse signal and a start-up stop signal are issued, where the second preset safety value is greater than or equal to the first preset safety value.
10. An engineering machinery, characterized in that, It includes the collapse detection system according to claim 7.