Vacuum circuit breaker and fuel cell engine system of vehicle

Abstract

The utility model provides a vacuum circuit breaker and a fuel cell engine system of a vehicle. The vacuum circuit breaker (100) is used for a fuel cell engine system of a vehicle, the vacuum circuit breaker (100) comprises at least two circuit breaker bodies (1) and a synchronizing mechanism (2) connected with the at least two circuit breaker bodies (1), a circuit breaker cavity (11) of each circuit breaker body (1) is arranged to be a vacuum cavity, and the synchronizing mechanism (2) is connected with the at least two circuit breaker bodies (1). The synchronizing mechanism (2) is respectively connected with the moving contacts (12) of the at least two circuit breaker bodies (1) and can synchronously drive the moving contacts (12) to move relative to the static contacts (13) of the circuit breaker bodies (1) so as to contact or leave the static contacts (13). Another means is provided for protecting components in the circuit, and the requirement for the pre-charging function is omitted.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle-mounted circuit breakers, and in particular, to a vacuum circuit breaker and a fuel cell engine system for a vehicle. Background Art

[0002] In a power transfer unit (PTU), contactors, switches, circuit breakers, or relays are typically used to connect and disconnect line current. A circuit breaker typically consists of a housing, a contact system, an operating mechanism, an arc extinguishing system, and a tripping system. When the circuit is operating normally, the circuit breaker is closed, and current flows through the circuit breaker's contacts (contact system). When a short circuit, overload, or other abnormal condition occurs in the circuit, the protective device within the circuit breaker detects the abnormal current flow. At this point, the tripping mechanism is triggered, causing the circuit breaker to quickly cut off power. The arc extinguishing system primarily operates during the arcing period when the circuit breaker's contacts are open.

[0003] Before opening and closing the line, it is necessary to implement pre-charging at both ends of the line to reduce arcing. Both high-voltage and low-voltage pre-charging require pre-charging circuits as additional circuits and coordination of software modules.

[0004] In this regard, the pre-charge function has strict requirements on voltage and current. Both high-voltage and low-voltage pre-charges require a certain amount of time to achieve this function. Utility Model Content

[0005] According to various aspects, the present disclosure aims to provide another means to protect components in a circuit and eliminate the need for a pre-charge function.

[0006] Furthermore, the present disclosure aims to solve or at least alleviate one or more problems existing in the prior art.

[0007] The present disclosure solves the above-mentioned problems by providing a vacuum circuit breaker and a fuel cell engine system for a vehicle. Specifically, according to one aspect of the present disclosure, there are provided:

[0008] A vacuum circuit breaker for a fuel cell engine system of a vehicle, wherein the vacuum circuit breaker includes at least two circuit breaker bodies and a synchronization mechanism connecting the at least two circuit breaker bodies, the circuit breaker cavities of the circuit breaker bodies being configured as vacuum cavities, and the synchronization mechanism being respectively connected to the movable contacts of the at least two circuit breaker bodies and capable of synchronously driving the movable contacts to move relative to the stationary contacts of the circuit breaker bodies to contact or separate from the stationary contacts.

[0009] According to another aspect of the present disclosure, the present disclosure provides a fuel cell engine system for a vehicle, wherein the fuel cell engine system includes any one of the above-mentioned vacuum circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and other features of the present disclosure will become apparent with reference to the accompanying drawings, in which:

[0011] Figure 1 shows a front view of a vacuum circuit breaker according to the present disclosure;

[0012] Figure 2 shows a side view of a vacuum circuit breaker according to the present disclosure;

[0013] Figure 3 shows a perspective view of a vacuum circuit breaker according to the present disclosure; and

[0014] Figure 4 A hydrogen fuel cell high-voltage DC-DC circuit diagram of a fuel cell engine system for a vehicle according to the present disclosure is shown. DETAILED DESCRIPTION

[0015] It is easy to understand that according to the technical solution of the present disclosure, without changing the essential spirit of the present disclosure, a person skilled in the art can propose a variety of interchangeable structural methods and implementation methods. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present disclosure and should not be regarded as the entire disclosure or as a limitation or restriction of the technical solution of the present disclosure.

[0016] The terms "up," "down," "left," "right," "front," "back," "front," "back," "top," and "bottom" mentioned or potentially mentioned in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may vary depending on their location or usage. Therefore, these or other directional terms should not be interpreted as restrictive. In addition, the terms "first," "second," "third," and similar expressions are used only for descriptive and distinguishing purposes and should not be understood to indicate or imply the relative importance of the corresponding components.

[0017] refer to Figures 1 to 3 ,in, Figure 1 shows a front view of a vacuum circuit breaker according to the present disclosure; Figure 2 shows a side view of a vacuum circuit breaker according to the present disclosure; and Figure 3 A perspective view of a vacuum circuit breaker according to the present disclosure is shown.

[0018] The vacuum circuit breaker 100 is used in a fuel cell engine system of a vehicle, wherein the vacuum circuit breaker 100 includes at least two circuit breaker bodies 1 and a synchronization mechanism 2 connecting the at least two circuit breaker bodies 1. The circuit breaker cavity 11 of the circuit breaker body 1 is configured as a vacuum cavity. The synchronization mechanism 2 is respectively connected to the movable contacts 12 of the at least two circuit breaker bodies 1 and can synchronously drive the movable contacts 12 to move relative to the static contacts 13 of the circuit breaker bodies 1 to contact or separate from the static contacts 13.

[0019] It should be understood that a vacuum circuit breaker is a component used for circuit switching, which realizes circuit switching through the contact and non-contact (separation) of the moving contact and the static contact, wherein the contact is the part of the contact used for actual contact. For example, the moving contact and the static contact are connected through the contact of the moving contact and the static contact respectively, and in the process from connection to disconnection, the moving contact moves as a whole, so that its moving contact moves away from the static contact of the static contact, realizing separation and disconnection. For example, when the moving contact and the static contact switch from contact to separation, an arc may be generated. The cavity of the vacuum circuit breaker is a vacuum cavity, that is, it uses vacuum as the arc extinguishing medium, and has a strong arc extinguishing ability, so it can quickly extinguish the arc, which plays a good protective role for circuit components. The use of vacuum circuit breakers eliminates the need for corresponding pre-charging circuits and software modules required in solutions such as relays, saving design time and running time. In addition, vacuum circuit breakers can give circuits a short-circuit impedance capability of kiloamperes. This is because, on the one hand, the vacuum in the circuit breaker cavity has strong insulation properties. The vacuum circuit breaker uses vacuum as an arc extinguishing and insulating medium, and the contact gap has high dielectric strength in a vacuum state. On the other hand, the vacuum circuit breaker uses vacuum diffusion arc extinguishing and has a high current-interrupting capability. Whenever a breakdown occurs between the contacts, it has the same breaking capacity as when the circuit breaker is open, so it can effectively deal with short-circuit situations. Therefore, the use of vacuum circuit breakers provides a possibility that even if there is a kiloampere current in the event of a short circuit, the contacts can still separate and interrupt the current, effectively protecting the components in the circuit.

[0020] In particular, vacuum circuit breakers use vacuum as an arc extinguishing medium, which has several significant advantages over other gases (such as nitrogen, hydrogen, and SF6 gas) as arc extinguishing media. For example, vacuum has a very high dielectric strength, and arc products (charged particles and metal vapor) have a very high diffusion rate in a rarefied gas, so that the dielectric strength of the contact gap can be quickly restored; due to the strong arc extinguishing ability of vacuum circuit breakers, the required contact opening distance during the breaking process is relatively small, which helps to reduce mechanical wear and thus extend mechanical life. Although filling the above-mentioned other gases for arc extinguishing can also achieve a certain effect, it may require a larger contact opening distance to ensure the complete extinction of the arc, which may increase mechanical wear; there are no flammable or explosive media in vacuum circuit breakers, so there is no risk of explosion and fire caused by media leakage, while the use of other gases may cause some safety hazards. For example, hydrogen is flammable and explosive, and SF6 gas can cause a greenhouse effect.

[0021] This design also uses a synchronization mechanism to synchronously control the moving contacts of the two circuit breaker bodies, thereby enabling synchronous control of the circuit's on-off state at two locations. Therefore, this technical solution can more comprehensively protect the components in the circuit and is particularly well-suited for circuits such as on-board fuel cell engine systems that involve bipolarity and have strict requirements for the synchronization of circuit on-off. Otherwise, if, for example, one vacuum circuit breaker is disconnected while the other is still connected, the components in the circuit on the side of the still-connected vacuum circuit breaker will be subject to a large short-circuit current, resulting in a higher risk of damage. If necessary, more vacuum circuit breakers can be provided, distributed in different locations along the circuit, depending on the circuit design or application requirements.

[0022] Regarding the connection and disconnection mechanism of the vacuum circuit breaker, in some embodiments of the present disclosure, the circuit breaker body 1 includes a guide spring, which is sleeved on the moving contact 12 and abuts against the inner wall of the circuit breaker cavity 11. When the moving contact 12 is not subjected to the force of the synchronization mechanism 2, the moving contact 12 contacts the static contact 13 due to the spring force of the guide spring.

[0023] It can be seen that the vacuum state provides a self-closing force for the vacuum circuit breaker. When the moving contact is pulled by the synchronization mechanism, the moving contact can overcome the self-closing force of the vacuum chamber and move, and compress the guide spring. When the synchronization mechanism is released, the moving contact moves axially upward (for example, Figure 1From a different perspective, the guide spring eventually contacts the static contact, closing the circuit. To this end, this technical solution arranges the guide spring to abut between the moving contact and the circuit breaker cavity, thereby resetting the moving contact. Those skilled in the art can flexibly adjust the guide spring's size, shape (torsion spring or straight spring), quantity, series-parallel connection, and material to meet varying spring force requirements.

[0024] The guide spring also plays a guiding role in the movement of the moving contact. The guide spring, through its arrangement on the moving contact and the spring force generated, can limit and compensate the movement of the moving contact, guide the moving contact in the correct direction, such as axial movement, to reduce or avoid radial deviation. In particular, one end of the guide spring is fixedly connected to the inner wall of the cavity, and the other end can slide against the end of the moving contact. Therefore, when the moving contact is offset (for example, due to radial offset when the synchronous mechanism drives the moving contact), the guide spring still maintains its original position and can, for example, compensate for the offset of the moving contact through the spring force when the moving contact is not affected by the synchronous mechanism and performs a reset movement, guiding the moving contact to maintain the correct direction of movement. To this end, the upper end of the moving contact can be designed to be T-shaped, for example, and the guide spring can slide against the end face of the T-shaped structure.

[0025] It's clear that various methods can be used to design a synchronization mechanism to synchronize the movement of the moving contacts, including mechanical and electromagnetic methods. The former synchronizes the movement of various components through mechanical structures such as connecting rods and gears. This design approach is simple and reliable. The latter utilizes the principle of electromagnetic force, controlling the magnitude and direction of the current to synchronize the movement of various components. This approach offers fast response speeds and high synchronization accuracy, making it suitable for non-contact applications.

[0026] This article takes a mechanical synchronization mechanism as an example for explanation. Specifically, the synchronization mechanism 2 includes a driving member 21 and a transmission member 22, wherein the transmission member 22 is fixedly connected to the moving contact 12, and the driving member 21 is connected to the transmission member 22 and is used to drive the transmission member 22 to move.

[0027] It can be seen that the synchronous driving of the moving contact is achieved by driving the transmission member as the driven member through the driving member as the driving member, and then the driving force is transmitted to the moving contact by the transmission member. This design form has high precision, reliability, and response speed, and the energy loss on the power transmission path is small, which makes the entire system have high stability. At the same time, the entire mechanical structure is simplified, and the manufacturing and maintenance costs are reduced. The specific coordination method of the driving member and the transmission member can be a mobile driving method. For example, the driving member is constructed in the form of a telescopic rod, and its telescopic movement drives the transmission member to perform corresponding feed or retraction movement, thereby controlling the synchronous movement of multiple moving contacts.

[0028] The specific cooperation mode of the driving member and the transmission member can also be a rotation driving mode, wherein the driving member 21 is configured as a rotating shaft. Thus, the rotational motion of the driving member as the rotating shaft is converted into the linear motion of the transmission member, thereby driving the moving contact to make corresponding movements, thereby realizing the contact or separation between the moving contact and the static contact. By converting the rotational motion into the linear motion design, the flexibility and compactness of the system are improved, the efficiency and accuracy of the motion transmission are maintained, and the implementation and maintenance costs are also controllable. In terms of quantity, for example, there can be one driving member or rotating shaft and two transmission members, both of which are connected to the driving member. Thus, the synchronous operation of the two transmission members or the two circuit breaker bodies can be realized through one driving member.

[0029] For example, in some embodiments of the present disclosure, a support 211 is constructed on the rotating shaft, one end of the transmission member 22 is arranged between the supports 211, and the synchronization mechanism 2 also includes a pin 23, which passes through the one end of the transmission member 22 and the support 211, so that the support 211 and the transmission member 22 can be connected in relative rotation.

[0030] To this end, it is understood that both the support and the end of the transmission member are provided with openings for the pin to pass through. The support is illustratively constructed to have a substantially triangular cross-section, which provides strong stability, high load capacity, and ease of processing and installation while saving materials. The end of the transmission member is illustratively designed to be substantially cubic or rectangular, which is easy to process, has good stability, is easy to install, and is easy to maintain. In addition, the coordination of the pin, support, and transmission member adopted in this technical solution, through this ingenious connection design, not only improves the flexibility and reliability of motion transmission and conversion, but also simplifies the installation and maintenance process, improves transmission efficiency, and has good adaptability and versatility. For example, the use of a pin as a connecting member not only achieves the function of supporting relative rotation, but also enhances the motion and structural stability between the support and the transmission member through physical connection, helps to reduce loosening or falling off due to vibration or external forces, and improves the reliability and durability of the entire synchronization mechanism. It also facilitates installation and disassembly. When maintenance or component replacement is required, the support and transmission member can be easily separated by removing the pin, reducing the complexity and cost of maintenance.

[0031] The present disclosure also provides a special design for the transmission member. Specifically, the transmission member 22 is constructed with an shed structure 221, and the shed structure 221 is constructed as an insulator.

[0032] First, it should be noted that the shed structure can be understood as an umbrella-like structural design, characterized by outward expansion from the main body to form one or more umbrella-like sections, presenting an umbrella-like raised structure. In the context of mechanical or electrical equipment, shed structures are often used for insulation, protection, or to increase surface area. In this technical solution, the shed structure is constructed as an insulator, which can increase creepage distance. Specifically, the shed structure improves voltage tolerance by increasing the surface path length (which can be understood as creepage distance). The longer discharge path along the insulation surface can also help reduce the density and energy of the discharge current, thereby improving the electrical strength of the vacuum circuit breaker, ensuring safe and stable operation of the circuit. Based on safety performance requirements, those skilled in the art can flexibly and adaptably adjust the number, maximum diameter, axial length, and other characteristics of the shed structures. Furthermore, as an insulator, the shed structure can be made of, for example, one or more materials such as plastic, rubber, glass, ceramic, and mica.

[0033] from Figures 1 to 3 It can also be seen that the circuit breaker body 1 includes busbars 14 respectively provided at both ends of the circuit breaker cavity 11 and electrically connected to the moving contact 12 and the static contact 13 , respectively. The busbars 14 are used to be connected to the fuel cell engine system.

[0034] The busbars are, for example, copper busbars, which have excellent electrical conductivity, are stable and durable, and are economical and cost-effective. In addition, the busbars can be designed in various shapes, such as an L-shaped structure, so that they can be easily connected to the corresponding system or its circuit while maintaining the compactness of the entire vacuum circuit breaker. Figure 4 This will be explained separately.

[0035] In terms of the assembly of the busbar, it is feasible that the vacuum circuit breaker 100 further includes a threaded fastener 5, the busbar 14 (upper busbar) at the static contact 13 is connected to the static contact 13 via the threaded fastener 5, and the transmission member 22 penetrates into the busbar 14 (lower busbar) at the moving contact 12 and the moving contact 12 and is threadedly connected to the moving contact 12.

[0036] To this end, it is understood that the busbar, moving contact, and static contact may be provided with grooves or openings for the installation of threaded fasteners or transmission members. Threaded fasteners include, for example, bolts, screws, and the like. This technical solution takes into account that the static contact is stationary during operation after assembly. Therefore, a threaded connection is utilized, which has the characteristics of secure connection, easy assembly and disassembly, strong load-bearing capacity, economy and practicality, and is easy to standardize and serialize. Depending on the size of the vacuum circuit breaker and the size of the corresponding accommodation space provided for the upper busbar and static contact, the threaded fastener may specifically be an M8 locking screw with a nominal diameter of 8 mm. The transmission member and the moving contact may also be threadedly connected. In some other embodiments, the transmission member on the moving contact side may also be constructed as a latch structure, for example, by achieving a rigid fixed connection through interference fit with the moving contact, thereby simplifying the structural design and assembly process while ensuring the secureness and stability of the connection, thereby driving the moving contact to advance or retract.

[0037] In terms of control of vacuum circuit breaker, combined with Figure 1 and Figure 3 It can be seen that the vacuum circuit breaker 100 further includes a controller 3 , which is connected to the synchronization mechanism 2 . The controller 3 is configured to control the synchronization mechanism 2 in response to a command signal from a fuel cell control unit of the vehicle.

[0038] It should be noted that while the controller is shown in a box shape in the figure, this is merely illustrative and does not constrain its shape or form. Depending on the actual situation, a controller should broadly encompass various devices or components that perform a control function, such as a circuit board assembly. To this end, the controller may also include or be configured with a motor to mechanically cooperate with a synchronization mechanism, such as a rotating shaft, thereby controlling the rotating shaft to rotate when desired.

[0039] It can be understood that the fuel cell control unit, namely FCCU (Fuel Cell Control Unit), in fuel cell electric vehicles, is responsible for the overall process control of the fuel cell system, covering communication and monitoring, energy management, system control, fault diagnosis and processing, as well as safety and reliability, to ensure the safe and efficient operation of the vehicle.

[0040] In this example, the controller of the vacuum circuit breaker uses the command signal issued by the fuel cell control unit to control the synchronization mechanism accordingly to connect or disconnect the vacuum circuit breaker, thereby achieving circuit control of the fuel cell engine system. Specifically, for example, the fuel cell control unit can collect data including the temperature of the fuel cell stack, the temperature of the cooling system, the pressure of the hydrogen supply system, the pressure of the air handling system, the hydrogen flow rate, the air flow rate, the humidity of the air handling system, the vehicle speed, the accelerator pedal position, the brake pedal position, and fault signals of the fuel cell engine system, such as sensor faults and actuator faults. The corresponding control instructions are sent to the controller to control the opening and closing of the vacuum circuit breaker or adjust the voltage and current of the high-voltage circuit.

[0041] It is also understandable that, for safety reasons, the controller 3 is configured with an interlock protector for interlocking the fuel cell engine system with the controller 3. Specifically, "interlock" is a safety protection mechanism for ensuring the coordinated operation and safe isolation between the fuel cell engine system (e.g., its fuel cell high-voltage DC-DC circuit) and the controller (e.g., its internal low-voltage control circuit). For example, in cases such as system failure, disconnection, signal error, maintenance operation, etc., the interlock protector can trigger the protection mechanism to cut off the electrical or signal connection between the fuel cell engine system and the controller to prevent potential danger or damage; under normal working conditions, the interlock protector ensures that the information flow between the fuel cell engine system and the controller is unimpeded to achieve precise control and coordination.

[0042] The present disclosure does not impose any particular restrictions on the specific design of the interlock protector. For example, the interlock protector includes: a sensor for monitoring connection status, current, voltage, and other parameters; a logic processing unit responsible for receiving signals from the sensor and making judgments and decisions based on preset logic rules, so that if any abnormality is detected (such as a disconnection, excessive current, abnormal voltage, etc.), the interlock logic unit will trigger the protection mechanism; and an actuator for cutting off or restoring the electrical or signal connection between the fuel cell engine system and the controller under the instruction of the interlock logic unit.

[0043] exist Figure 1 and Figure 3 It can also be clearly seen that the vacuum circuit breaker 100 further includes an indicator 4, which is provided on the synchronization mechanism 2. When the moving contact 12 is in contact with the static contact 13, the indicator 4 presents a first state. When the moving contact 12 leaves the static contact 13, the indicator 4 presents a second state different from the first state.

[0044] It can be seen that the indicator can reflect whether the moving contact and the static contact are in contact or spaced apart by presenting the first state or the second state, and further reflect the on-off status of the circuit where the vacuum circuit breaker is located. To this end, it can be understood that the vacuum circuit breaker has a package or shell, which can accommodate most of the components of the vacuum circuit breaker for protection, and only exposes components such as busbars that need to be connected to the outside of the shell. Therefore, in order to intuitively display the on-off status of the vacuum circuit breaker, the present technical solution designs an indicator, and the shell has a corresponding structure such as an observation window or opening, so that relevant personnel can observe the status of the indicator through the corresponding structure.

[0045] There is no particular limitation on the specific design of the indicator. It can be formed by two marks of two different colors, shapes or sizes as shown in the figure, and one of the marks is displayed to the outside according to the movement of the synchronization mechanism (such as the rotating shaft), thereby reflecting the on-off state of the vacuum circuit breaker. The indicator can also present different states by means of a digital display screen or by other means such as sound signals. In this example, the indicator has two rectangular marks, red and green, and is set on the rotating shaft and displays one of the marks to the outside as the rotating shaft rotates. In this way, the state of the vacuum circuit breaker can be effectively indicated with a simple design. Among them, the red mark can correspond to the on state, and the green mark can correspond to the off state.

[0046] Combine Figure 4 , which shows a hydrogen fuel cell high-voltage DC-DC circuit diagram of a fuel cell engine system for a vehicle according to the present disclosure.

[0047] According to another aspect of the present disclosure, the present disclosure also relates to a fuel cell engine system for a vehicle, wherein the fuel cell engine system includes any of the aforementioned vacuum circuit breakers 100. Thus, the fuel cell engine system for a vehicle of the present disclosure can inherit various embodiments and corresponding technical effects of vacuum circuit breakers, which will not be elaborated here.

[0048] However, it should be mentioned that the fuel cell engine system includes an electric drive part and an electric control part, wherein the electric control part includes the aforementioned fuel cell control unit, and the electric drive part includes a hydrogen fuel cell high-voltage DC-DC circuit, which is used to output electrical energy to the drive motor, which in turn drives the vehicle.

[0049] It is feasible that the fuel cell engine system includes a hydrogen fuel cell high-voltage DC-DC circuit 1000, the hydrogen fuel cell high-voltage DC-DC circuit 1000 includes a hydrogen fuel cell 1001, a DC-DC circuit 1002 and a high-voltage battery 1003, and the vacuum circuit breaker 100 is arranged on the DC-DC circuit 1002 and is respectively connected to the positive terminal 10031 and the negative terminal 10032 of the high-voltage battery 1003.

[0050] Among them, the DC (Direct Current)-DC circuit (also known as a high-power DC-DC circuit for fuel cell vehicles) can achieve DC voltage conversion of different voltage levels by adopting switching power supply technology, thereby improving the overall stability and reliability of the system. For example, it can convert the wide voltage range (such as 200V to 1100V) output of the fuel cell stack (i.e., hydrogen fuel cell) into stable DC power (such as 800V) for use by high-voltage batteries (such as lithium batteries). The DC-DC circuit can optimize the matching degree between the fuel cell and the high-voltage battery, reduce energy loss during the conversion process, improve the energy utilization rate of the entire vehicle, and prevent high-voltage electricity from damaging sensitive equipment by isolating the fuel cell and the high-voltage battery, thereby ensuring the safe operation of the vehicle. In addition, by setting up a vacuum circuit breaker, it can directly control the on and off of the entire DC-DC circuit, thereby achieving effective protection for the entire circuit.

[0051] It should be understood that all the above preferred embodiments are illustrative rather than restrictive, and that various modifications or variations made by those skilled in the art to the above-described specific embodiments under the concept of the present disclosure should be within the legal protection scope of the present disclosure.

Claims

1. A vacuum circuit breaker (100) for a fuel cell engine system of a vehicle, characterized in that: The vacuum circuit breaker (100) comprises at least two circuit breaker bodies (1) and a synchronization mechanism (2) connecting the at least two circuit breaker bodies (1); the circuit breaker cavity (11) of the circuit breaker body (1) is configured as a vacuum cavity; the synchronization mechanism (2) is respectively connected to the moving contacts (12) of the at least two circuit breaker bodies (1) and is capable of synchronously driving the moving contacts (12) to move relative to the static contacts (13) of the circuit breaker body (1) so as to contact or leave the static contacts (13).

2. The vacuum circuit breaker (100) according to claim 1, characterized in that The synchronization mechanism (2) comprises a driving member (21) and a transmission member (22), wherein the transmission member (22) is fixedly connected to the moving contact (12), and the driving member (21) is connected to the transmission member (22) and is used to drive the transmission member (22) to move.

3. The vacuum circuit breaker (100) according to claim 2, characterized in that The driving member (21) is configured as a rotation shaft.

4. The vacuum circuit breaker (100) according to claim 3, characterized in that A support (211) is constructed on the rotating shaft, and one end of the transmission member (22) is arranged between the supports (211). The synchronization mechanism (2) also includes a latch (23), and the latch (23) passes through the one end of the transmission member (22) and the support (211), so that the support (211) and the transmission member (22) can be connected in a relatively rotatable manner.

5. The vacuum circuit breaker (100) according to claim 2, characterized in that The transmission member (22) is configured with an umbrella skirt structure (221), and the umbrella skirt structure (221) is configured as an insulator.

6. The vacuum circuit breaker (100) according to claim 3, characterized in that The circuit breaker body (1) comprises busbars (14) respectively arranged at two ends of the circuit breaker cavity (11) and respectively electrically connected to the moving contact (12) and the static contact (13); the busbars (14) are used to be connected to the fuel cell engine system.

7. The vacuum circuit breaker (100) according to claim 1, characterized in that The circuit breaker body (1) includes a guide spring, which is sleeved on the movable contact (12) and abuts against the inner wall of the circuit breaker cavity (11). When the movable contact (12) is not subjected to the force of the synchronization mechanism (2), the movable contact (12) contacts the static contact (13) due to the spring force of the guide spring.

8. The vacuum circuit breaker (100) according to claim 1, characterized in that The vacuum circuit breaker (100) further includes a controller (3) connected to the synchronization mechanism (2), and the controller (3) is configured to control the synchronization mechanism (2) in response to a command signal from a fuel cell control unit of the vehicle.

9. The vacuum circuit breaker (100) according to claim 8, characterized in that The controller (3) is configured with an interlock protector for interlocking the fuel cell engine system with the controller (3).

10. The vacuum circuit breaker (100) according to claim 1, characterized in that The vacuum circuit breaker (100) further comprises an indicator (4), wherein the indicator (4) is arranged on the synchronization mechanism (2); when the moving contact (12) is in contact with the static contact (13), the indicator (4) presents a first state; and when the moving contact (12) is away from the static contact (13), the indicator (4) presents a second state different from the first state.

11. The vacuum circuit breaker (100) according to claim 6, characterized in that The vacuum circuit breaker (100) further includes a threaded fastener (5), the busbar (14) at the static contact (13) is connected to the static contact (13) via the threaded fastener (5), and the transmission member (22) penetrates the busbar (14) at the moving contact (12) and the moving contact (12) and is threadedly connected to the moving contact (12).

12. A fuel cell engine system for a vehicle, characterized in that: The fuel cell engine system comprises a vacuum circuit breaker (100) according to any one of claims 1 to 11.

13. The fuel cell engine system for a vehicle according to claim 12, wherein: The fuel cell engine system comprises a hydrogen fuel cell high-voltage DC-DC circuit (1000), wherein the hydrogen fuel cell high-voltage DC-DC circuit (1000) comprises a hydrogen fuel cell (1001), a DC-DC circuit (1002), and a high-voltage battery (1003); the vacuum circuit breaker (100) is arranged on the DC-DC circuit (1002) and is respectively connected to a positive terminal (10031) and a negative terminal (10032) of the high-voltage battery (1003).

Images