Whole vehicle grounding device, vehicle body and train

Abstract

The utility model discloses a whole vehicle grounding device, a vehicle body and a train, and relates to the technical field of rail transit. A chassis grounding grid of the whole vehicle grounding device is arranged on the lower side of a chassis of the composite vehicle body; the roof grounding grid is arranged on the inner surface of the roof of the composite vehicle body; the side wall grounding grid is arranged on the inner surface of the side wall of the composite vehicle body; wherein the chassis grounding grid, the side wall grounding grid and the roof grounding grid are modularly assembled, the roof grounding grid and the side wall grounding grid are connected through a conduction structure, the side wall grounding grid and the chassis grounding grid are connected through a conduction structure, the chassis grounding grid is connected with the grounding structure, and the chassis grounding grid, the side wall grounding grid and the roof grounding grid form a three-dimensional grounding grid. According to the whole vehicle grounding device, a three-dimensional grounding network is formed through the architecture mode of first local grounding and then overall grounding, the problems of complex process and difficult maintenance caused by the fact that a traditional grounding device is pre-buried in a vehicle body are effectively solved, and the whole vehicle grounding performance and maintenance convenience are improved.

Description

Technical Field

[0001] This application relates to the field of rail transit technology, and in particular to a vehicle grounding device, a vehicle body, and a train. Background Technology

[0002] With the continuous development of rail transit technology, the electrical systems of vehicles are becoming increasingly complex, and the requirements for the vehicle's grounding device are also becoming more stringent. The grounding device is a crucial component in ensuring the safe and stable operation of the vehicle's electrical system. It connects electrical equipment to the ground, forming an effective current loop to prevent electrical faults and safety accidents. Traditional vehicle grounding devices typically employ pre-embedded or locally installed methods, placing the grounding device inside the vehicle body or at specific locations to achieve the function of grounding protection.

[0003] However, the pre-embedded grounding devices used in existing technologies have a significant technical problem: during the production of vehicle body parts, the grounding device needs to be pre-embedded inside the vehicle body. This approach is not only complex in its manufacturing process but also damages the internal structure of the vehicle body parts, indirectly affecting the vehicle's strength. Furthermore, when the grounding device fails, repairs are extremely difficult, requiring damage to vehicle body parts. This not only increases maintenance costs but may also lead to further damage to the vehicle's structure, affecting its service life and safety. Utility Model Content

[0004] The purpose of this application is to provide a vehicle grounding device that forms a three-dimensional grounding network through a partial-to-overall architecture. This effectively solves the problems of complex manufacturing processes and difficult maintenance caused by pre-embedding traditional grounding devices inside the vehicle body, thereby improving the overall grounding performance and maintenance convenience of the vehicle. Another purpose of this application is to provide a vehicle body and train.

[0005] To achieve the above objectives, this application provides a vehicle grounding device, comprising:

[0006] The underframe grounding grid is installed on the underside of the composite material vehicle body's underframe.

[0007] A roof-mounted grounding grid is installed on the inner surface of the roof of a composite material vehicle body;

[0008] The side wall grounding grid is installed on the inner surface of the side wall of the composite material vehicle body;

[0009] The chassis grounding grid, the side wall grounding grid, and the roof grounding grid are modularly assembled. The roof grounding grid is connected to the side wall grounding grid through a conductive structure. The side wall grounding grid is connected to the chassis grounding grid through a conductive structure. The chassis grounding grid is connected to a grounding structure. The chassis grounding grid, the side wall grounding grid, and the roof grounding grid constitute a three-dimensional grounding network.

[0010] In some embodiments, the number of sidewall grounding grids is two sets, which are respectively disposed on the inner surfaces of the two sidewalls of the composite material vehicle body;

[0011] The two sides of the roof grounding grid are respectively connected to the upper ends of the two sets of side wall grounding grids, and the two sides of the underframe grounding grid are respectively connected to the lower ends of the two sets of side wall grounding grids.

[0012] The three-dimensional grounding network is a cage-shaped grounding network.

[0013] In some embodiments, at least one of the underframe grounding grid, the roof grounding grid, and the side wall grounding grid includes a metal busbar, the metal busbar being provided with a connector structure for connection to the conductive structure.

[0014] In some embodiments, at least one of the underframe grounding grid, the roof grounding grid, and the sidewall grounding grid is composed of multiple sections of the metal strip spliced ​​together.

[0015] In some embodiments, the connector structure includes bolt holes, and the metal bars are connected to each other and to the conductive structure by bolt crimping.

[0016] In some embodiments, the metal strip is provided with weight-reducing holes, the diameter of which is equal to the diameter of the bolt holes, and the weight-reducing holes and the bolt holes are distributed along the length of the metal strip.

[0017] In some embodiments, at least one of the underframe grounding grid, the roof grounding grid, and the sidewall grounding grid is connected to the composite material vehicle body by bolting or riveting.

[0018] In some embodiments, the grounding structure includes at least one of a grounding nut, a grounding base, and a grounding terminal; and / or,

[0019] The conductive structure includes a soft grounding wire.

[0020] This application also provides a vehicle body, including the aforementioned vehicle grounding device.

[0021] This application also provides a train, including the aforementioned car body.

[0022] Compared to the aforementioned background technology, the vehicle grounding device provided in this application includes a chassis grounding grid, a roof grounding grid, and a side wall grounding grid. The chassis grounding grid is disposed on the underside of the chassis of the composite material vehicle body; the roof grounding grid is disposed on the inner surface of the roof of the composite material vehicle body; and the side wall grounding grid is disposed on the inner surface of the side wall of the composite material vehicle body. The chassis grounding grid, side wall grounding grid, and roof grounding grid are modularly assembled. The roof grounding grid and the side wall grounding grid are connected through a conductive structure, the side wall grounding grid and the chassis grounding grid are connected through a conductive structure, and the chassis grounding grid is connected to a grounding structure. The chassis grounding grid, side wall grounding grid, and roof grounding grid constitute a three-dimensional grounding network.

[0023] In traditional vehicle grounding systems, the grounding equipment is typically embedded within the vehicle body during manufacturing. This not only complicates the manufacturing process, requiring space to be reserved within the vehicle structure for precise installation of the grounding device, but also makes repairs extremely difficult if the grounding device malfunctions, often necessitating structural damage. This increases repair costs and may compromise the integrity and strength of the vehicle body. To address these issues, this application provides a novel vehicle grounding system that employs a modular assembly approach, placing the underframe grounding grid, roof grounding grid, and side wall grounding grids in different locations within the vehicle body.

[0024] Specifically, the underframe grounding grid is installed on the underside of the composite material vehicle body's underframe, the roof grounding grid is installed on the inner surface of the roof, and the side wall grounding grids are installed on the inner surface of the side walls. This layout allows each grounding grid to be installed independently, simplifying the installation process and avoiding complex pre-embedding work inside the vehicle body. Through a conductive structure, the roof grounding grid is connected to the side wall grounding grid, the side wall grounding grid is connected to the underframe grounding grid, and finally the underframe grounding grid is connected to the grounding structure, forming a complete three-dimensional grounding network. This three-dimensional grounding network not only covers multiple key areas of the vehicle body, improving the overall grounding performance, but also, because each grounding grid is an independent module, allows for direct operation on the corresponding module during maintenance or replacement without damaging the vehicle body structure, greatly improving the convenience and efficiency of maintenance.

[0025] Based on the above structural and process descriptions, it can be seen that the vehicle grounding device has at least the following beneficial effects: the vehicle grounding device forms a three-dimensional grounding network through a local-to-overall architecture, which effectively solves the problems of complex processes and difficult maintenance caused by the pre-embedding of traditional grounding devices inside the vehicle body, and improves the grounding performance and maintenance convenience of the whole vehicle. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 A schematic diagram of the vehicle grounding device provided in the embodiments of this application;

[0028] Figure 2 A schematic diagram of the base frame grounding grid provided in an embodiment of this application;

[0029] Figure 3 A schematic diagram of the roof grounding grid provided in an embodiment of this application;

[0030] Figure 4 A schematic diagram of the sidewall grounding grid provided in an embodiment of this application;

[0031] Figure 5 This is a schematic diagram of the crimping of the base frame grounding grid provided in the embodiments of this application;

[0032] Figure 6 This is a schematic diagram of the crimping of the roof grounding grid provided in an embodiment of this application;

[0033] Figure 7 This is a schematic diagram showing the connection between the base frame grounding grid and the side wall grounding grid provided in an embodiment of this application;

[0034] Figure 8 This is a schematic diagram showing the connection between the roof grounding grid and the side wall grounding grid provided in an embodiment of this application.

[0035] in:

[0036] Vehicle grounding device 100

[0037] 1. Underframe grounding grid; 2. Roof grounding grid; 3. Side wall grounding grid; 4. Conductive structure; 5. Metal busbar.

[0038] Underframe 01, roof 02, side wall 03. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Please refer to Figures 1 to 4 ,in, Figure 1 This is a schematic diagram of the vehicle grounding device provided in the embodiments of this application. Figure 2 This is a schematic diagram of the base frame grounding grid provided in an embodiment of this application. Figure 3 This is a schematic diagram of the roof grounding grid provided in an embodiment of this application. Figure 4 This is a schematic diagram of the sidewall grounding grid provided in an embodiment of this application.

[0042] Composite material vehicle bodies generally refer to vehicle body structures manufactured using composite materials. These materials are widely used in the manufacture of modern vehicles due to their lightweight, high strength, and corrosion resistance. In composite material vehicle bodies, the roof, side walls, and floor typically utilize composite materials to improve the overall performance of the vehicle.

[0043] In a first specific embodiment, the vehicle grounding device 100 provided in this application includes a chassis grounding grid 1, a roof grounding grid 2, and a side wall grounding grid 3. The chassis grounding grid 1 is disposed on the underside of the chassis 01 of the composite material vehicle body; the roof grounding grid 2 is disposed on the inner surface of the roof 02 of the composite material vehicle body; and the side wall grounding grid 3 is disposed on the inner surface of the side wall 03 of the composite material vehicle body. The chassis grounding grid 1, the side wall grounding grid 3, and the roof grounding grid 2 are modularly assembled. The roof grounding grid 2 and the side wall grounding grid 3 are connected through a conductive structure 4. The side wall grounding grid 3 and the chassis grounding grid 1 are connected through a conductive structure 4. The chassis grounding grid 1 is connected to a grounding structure. The chassis grounding grid 1, the side wall grounding grid 3, and the roof grounding grid 2 constitute a three-dimensional grounding network.

[0044] In traditional vehicle grounding systems 100, the grounding equipment is typically embedded inside the vehicle body during manufacturing. This not only complicates the manufacturing process, requiring space to be reserved within the vehicle structure for precise installation of the grounding device, but also makes repairs extremely difficult if the grounding device malfunctions, often necessitating structural damage. This increases repair costs and may compromise the integrity and strength of the vehicle body. To address these issues, this application provides a novel vehicle grounding system 100 that employs a modular assembly approach, with the underframe grounding grid 1, roof grounding grid 2, and side wall grounding grid 3 respectively positioned at different locations within the vehicle body.

[0045] Specifically, the underframe grounding grid 1 is installed on the underside of the underframe 01 of the composite material vehicle body, the roof grounding grid 2 is installed on the inner surface of the roof 02, and the side wall grounding grid 3 is installed on the inner surface of the side wall 03. This layout allows each grounding grid to be installed independently, simplifying the installation process and avoiding complex pre-embedding work inside the vehicle body. Through the conductive structure 4, the roof grounding grid 2 is connected to the side wall grounding grid 3, the side wall grounding grid 3 is connected to the underframe grounding grid 1, and finally the underframe grounding grid 1 is connected to the grounding structure, forming a complete three-dimensional grounding network. This three-dimensional grounding network not only covers multiple key areas of the vehicle body, improving the overall grounding performance of the vehicle, but also, because each grounding grid is an independent module, when maintenance or replacement is required, the corresponding module can be operated directly without damaging the vehicle body structure, greatly improving the convenience and efficiency of maintenance.

[0046] Based on the above structural and process descriptions, it can be seen that the vehicle grounding device 100 has at least the following beneficial effects: The vehicle grounding device 100 forms a three-dimensional grounding network through a local-to-overall architecture, which effectively solves the problems of complex processes and difficult maintenance caused by the traditional grounding device being pre-embedded inside the vehicle body, and improves the grounding performance and maintenance convenience of the whole vehicle.

[0047] In some embodiments, the number of side wall grounding grids 3 is two sets, which are respectively set on the inner surfaces of the two side walls 03 of the composite material vehicle body;

[0048] The two sides of the roof grounding grid 2 are respectively connected to the upper ends of the two sets of side wall grounding grids 3, and the two sides of the underframe grounding grid 1 are respectively connected to the lower ends of the two sets of side wall grounding grids 3.

[0049] The three-dimensional grounding network is a cage-like grounding network.

[0050] In this embodiment, the side wall grounding grid 3 of the vehicle grounding device 100 is designed as two sets, each set being installed on the inner surface of the two side walls 03 of the composite material vehicle body. This layout ensures that the electrical equipment on both sides of the vehicle body can obtain good grounding protection, improving the coverage and uniformity of the grounding device.

[0051] The roof grounding grid 2 is connected to the upper ends of the two sets of side wall grounding grids 3 via conductive structures 4 on both sides, while the underframe grounding grid 1 is connected to the lower ends of the two sets of side wall grounding grids 3 via conductive structures 4 on both sides. This connection method allows the roof grounding grid 2, side wall grounding grids 3, and underframe grounding grid 1 to form a complete grounding loop, enhancing the conductivity and stability of the entire grounding network.

[0052] Ultimately, these grounding grids together form a three-dimensional cage-like grounding network. The cage-like structure, similar to a three-dimensional cage, effectively covers multiple critical areas of the vehicle body, allowing current to flow smoothly in all directions. This structure not only improves the conductivity of the entire vehicle's grounding system 100%, but also enhances the reliability and stability of the grounding network, ensuring the safe and stable operation of the electrical system and reducing the probability of electrical faults.

[0053] Please refer to Figures 5 to 8 ,in, Figure 5 This is a schematic diagram of the crimping of the base frame grounding grid provided in an embodiment of this application. Figure 6 This is a schematic diagram of the crimping of the roof grounding grid provided in an embodiment of this application. Figure 7 This is a schematic diagram showing the connection between the base frame grounding grid and the side wall grounding grid provided in an embodiment of this application. Figure 8 This is a schematic diagram showing the connection between the roof grounding grid and the side wall grounding grid provided in an embodiment of this application.

[0054] In some embodiments, at least one of the underframe grounding grid 1, the roof grounding grid 2, and the side wall grounding grid 3 includes a metal busbar 5, which is provided with a connector structure for connection to the conductive structure 4.

[0055] In this embodiment, the metal busbar 5 is an important component, meaning that it can be used to form one or more of the underframe grounding network 1, the roof grounding network 2, and the side wall grounding network 3. For example, the underframe grounding network 1, the roof grounding network 2, and the side wall grounding network 3 can all be composed of the metal busbar 5.

[0056] The use of metal busbar 5 provides the grounding grid with good conductivity and structural stability, enabling it to effectively guide the current through metal busbar 5 and conductive structure 4 to the grounding structure, thereby achieving grounding protection for the entire grounding network.

[0057] The connector structure on the metal busbar 5 allows for easy connection to other grounding grids or conductive structures 4, enhancing the overall performance and reliability of the grounding device. This design enables the grounding grid to better adapt to different installation environments and requirements, providing a flexible grounding solution.

[0058] In some cases, metal busbar 5 is made of aluminum, providing excellent grounding performance for the entire vehicle. The grounding protection of the entire vehicle grounding system is achieved through the conductive paths between the aluminum busbars. The connection between the underframe grounding grid 1 and the grounding structure can be achieved by welding the aluminum busbars to the grounding base.

[0059] In some embodiments, at least one of the underframe grounding grid 1, the roof grounding grid 2, and the side wall grounding grid 3 is composed of multiple metal strips 5 spliced ​​together.

[0060] In this embodiment, this design allows the grounding grid to be flexibly adjusted according to the specific structure and spatial layout of the vehicle body. For example, in certain areas of the vehicle body, due to space constraints or interference from other structures, it may be impossible to construct a grounding grid using a single continuous metal strip 5. In this case, by dividing the metal strip 5 into multiple segments and splicing them together, this problem can be effectively solved, ensuring that the grounding grid can cover all critical parts of the vehicle body. In addition, this splicing design simplifies the installation process, because each segment of the metal strip 5 can be installed and positioned independently, and finally connected through the conductive structure 4, making the installation of the grounding grid in complex vehicle body structures easier and more efficient.

[0061] When a section of metal busbar 5 in the grounding grid is damaged or needs replacement, only that section needs maintenance, without disassembling and replacing the entire grounding grid. This localized maintenance method significantly reduces maintenance costs and time, and improves the maintainability of the grounding device. Simultaneously, the multi-section metal busbar 5 splicing design enhances the adaptability of the grounding grid, allowing it to better adapt to changes in the shape and structure of the vehicle body. For example, in curved or irregular parts of the vehicle body, or in areas where equipment inside the vehicle interferes, good grounding coverage can be achieved by altering the structure of the grounding grid, such as adjusting the splicing method of the metal busbar 5, maintaining the connectivity of the grounding grid, and ensuring the stability and reliability of the entire vehicle grounding system.

[0062] In some embodiments, the connector structure includes bolt holes, and the metal bars 5 are connected to each other and to the conductive structure 4 by bolt crimping.

[0063] In this embodiment, the bolt holes, as part of the joint structure, provide reliable connection points for the connection between the metal busbars 5. Through bolt crimping, the metal busbars 5 can be tightly connected together to form a robust grounding network. This connection method not only ensures the conductivity between the metal busbars 5 but also has high mechanical strength, capable of withstanding certain mechanical stress, thus guaranteeing the stability of the grounding network during vehicle operation.

[0064] Furthermore, bolt crimping offers excellent maintainability. When the grounding grid needs inspection or replacement, the metal busbar 5 can be quickly separated by removing the bolts, facilitating maintenance personnel's operation. This design makes the grounding device more flexible and convenient during installation, maintenance, and replacement, improving the reliability and maintainability of the entire vehicle's grounding system.

[0065] In some embodiments, the metal strip 5 is provided with weight reduction holes, the diameter of which is equal to the diameter of the bolt holes, and the weight reduction holes and bolt holes are distributed along the length of the metal strip 5.

[0066] In this embodiment, the weight reduction hole can effectively reduce the weight of the metal busbar 5, thereby reducing the weight of the entire grounding device, which is of positive significance for the lightweight design of the vehicle.

[0067] Meanwhile, because its hole diameter is equal to that of the bolt hole, it ensures that the weight-reducing hole can be used as a bolt hole when needed, realizing the connection between metal strips 5 or the connection with the conductive structure 4. This functional interchangeability makes the metal strip 5 more flexible during installation, and can be adaptively adjusted according to the actual situation of the vehicle body's internal structure to meet different installation requirements.

[0068] In some embodiments, at least one of the underframe grounding grid 1, the roof grounding grid 2, and the side wall grounding grid 3 is connected to the composite material vehicle body by bolting or riveting.

[0069] In this embodiment, this connection method ensures that the metal strip 5 is firmly fixed to the vehicle body. Bolting and riveting are both mechanical connection methods with high connection strength and stability, which can effectively fix the metal strip 5 to the chassis 01, roof 02 and side wall 03 of the vehicle body, making it less likely to shift or fall off during vehicle operation.

[0070] This connection method establishes good electrical contact between the metal busbar 5 and the vehicle body, ensuring the conductivity and grounding effect of the grounding network. Furthermore, bolting and riveting offer good adaptability, allowing adjustments based on the specific structure and material properties of the vehicle body to meet the needs of different vehicle models and installation environments. This design makes the grounding device more reliable and stable during installation, improving the safety and reliability of the entire vehicle grounding system.

[0071] In some embodiments, the grounding structure includes at least one of a grounding nut, a grounding base, and a grounding terminal.

[0072] In this embodiment, taking the underframe grounding grid 1, which is composed of multiple metal busbars 5, as an example, the metal busbars 5 of this grounding grid serve as busbars, playing a crucial role in collecting and distributing current. To achieve connection with external grounding systems, grounding nuts or grounding seats can be welded to the metal busbars 5 nearby. These grounding elements provide reliable connection points, enabling the underframe grounding grid 1 to effectively connect with other grounding equipment on the vehicle or grounding facilities on the ground. Furthermore, studs can be pressed onto the metal busbars 5 to connect grounding terminals, further enhancing the connection flexibility and stability of the grounding network. Through these grounding structures, the underframe grounding grid 1 can effectively guide current to the ground, ensuring the safe and stable operation of the entire vehicle grounding system.

[0073] In some embodiments, the conductive structure 4 includes a soft grounding wire.

[0074] In this embodiment, the use of a soft grounding wire not only ensures the conductivity continuity of the grounding network but also adapts to vibrations and displacements that may occur during vehicle operation, enhancing the stability and reliability of the grounding system. Through this design, the vehicle grounding device can effectively collect and conduct current from various parts to the ground, ensuring the safe and stable operation of the vehicle's electrical system.

[0075] This application also provides a vehicle body, including the aforementioned vehicle grounding device 100.

[0076] In this embodiment, this application provides a vehicle body, specifically a composite material vehicle body, including a chassis 01, a roof 02, and side walls 03. This composite material vehicle body has advantages such as lightweight, high strength, and good corrosion resistance, but it also places higher demands on electrical grounding. Therefore, the aforementioned whole-vehicle grounding device 100 is integrated into the vehicle body, forming a complete network structure within the composite material vehicle body. The whole-vehicle grounding device 100 uses segmented, spliced ​​aluminum busbars on the chassis 01, roof 02, and side walls 03, with welded grounding bases. The aluminum busbars are bolted together to form a cage-like grounding network. After the vehicle body is assembled, the metal busbars on the components are connected by flexible grounding wires to form a three-dimensional grounding network. This design allows the grounding device to effectively cover all critical parts of the vehicle body, providing reliable grounding protection for electrical equipment on the vehicle body, ensuring the safe and stable operation of the electrical system, and also improving the overall electrical performance and reliability of the vehicle body.

[0077] This application also provides a train, including the aforementioned car body.

[0078] In this embodiment, the train, by employing a car body including a whole-vehicle grounding device 100, possesses excellent electrical and safety performance. The complete network structure formed by the whole-vehicle grounding device 100 within the composite material car body ensures stable grounding of all electrical equipment during train operation, effectively preventing electrical faults and improving the train's operational safety and reliability. Furthermore, the lightweight design of the composite material car body also contributes to improving the train's energy efficiency and operational efficiency, reducing energy consumption and operating costs. By combining an advanced whole-vehicle grounding device with a composite material car body, the train of this application exhibits significant advantages in electrical safety, structural strength, and energy conservation and environmental protection, meeting the demands of modern rail transit for high efficiency, safety, and environmental friendliness.

[0079] It should be noted that many of the components mentioned in this application are general standard parts or components known to those skilled in the art, and their structure and principle can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0080] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0081] The above provides a detailed description of the vehicle grounding device, vehicle body, and train provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A vehicle grounding device, characterized in that, include: The underframe grounding grid is installed on the underside of the composite material vehicle body's underframe. A roof-mounted grounding grid is installed on the inner surface of the roof of a composite material vehicle body; The side wall grounding grid is installed on the inner surface of the side wall of the composite material vehicle body; The chassis grounding grid, the side wall grounding grid, and the roof grounding grid are modularly assembled. The roof grounding grid is connected to the side wall grounding grid through a conductive structure. The side wall grounding grid is connected to the chassis grounding grid through a conductive structure. The chassis grounding grid is connected to a grounding structure. The chassis grounding grid, the side wall grounding grid, and the roof grounding grid constitute a three-dimensional grounding network.

2. The vehicle grounding device according to claim 1, characterized in that, The number of sidewall grounding grids is two sets, which are respectively set on the inner surfaces of the two sidewalls of the composite material vehicle body; The two sides of the roof grounding grid are respectively connected to the upper ends of the two sets of side wall grounding grids, and the two sides of the underframe grounding grid are respectively connected to the lower ends of the two sets of side wall grounding grids. The three-dimensional grounding network is a cage-shaped grounding network.

3. The vehicle grounding device according to claim 1, characterized in that, At least one of the underframe grounding grid, the roof grounding grid, and the side wall grounding grid includes a metal busbar, the metal busbar being provided with a connector structure for connecting to the conductive structure.

4. The vehicle grounding device according to claim 3, characterized in that, At least one of the underframe grounding grid, the roof grounding grid, and the side wall grounding grid is composed of multiple sections of the aforementioned metal strips spliced ​​together.

5. The vehicle grounding device according to claim 3, characterized in that, The joint structure includes bolt holes, and the metal bars are connected to each other and to the conductive structure by bolt pressing.

6. The vehicle grounding device according to claim 5, characterized in that, The metal strip is provided with weight-reducing holes, the diameter of which is equal to the diameter of the bolt holes, and the weight-reducing holes and the bolt holes are distributed along the length of the metal strip.

7. The vehicle grounding device according to claim 1, characterized in that, At least one of the underframe grounding grid, the roof grounding grid, and the side wall grounding grid is connected to the composite material vehicle body by bolting or riveting.

8. The vehicle grounding device according to claim 1, characterized in that, The grounding structure includes at least one of a grounding nut, a grounding base, and a grounding terminal; and / or, The conductive structure includes a soft grounding wire.

9. A vehicle body, characterized in that, Includes the vehicle grounding device as described in any one of claims 1 to 8.

10. A train, characterized in that, Includes the vehicle body as described in claim 9.

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