A combined bottom guard plate

Abstract

The utility model provides a combined bottom guard plate for the protection of the external box loaded with the battery cell, and the bottom guard plate comprises a substrate and an edge gasket which are independent of each other, the substrate comprises a bearing surface facing the external box, at least part of the edge area of the bearing surface is provided with a first connecting piece for connecting the edge gasket, and the edge gasket is protruded towards the external box relative to the bearing surface and used for bearing and fixing the external box above the edge area of the bearing surface. The utility model combines the special-shaped structure bottom guard plate by reasonably designing the structure and the connecting mode of each unit, reduces the production cost and improves the production efficiency while ensuring the protection quality of the bottom guard plate.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery protection, specifically to a combined bottom protection plate. Background Technology

[0002] With the rapid development of new energy technologies, especially the widespread adoption of electric vehicles and renewable energy storage systems, efficient and reliable energy storage systems have become crucial. Traditional battery underbody protection plates for new energy vehicles are generally made of metal or thermosetting composite materials, manufactured through stamping or molding. Metal underbody protection plates suffer from drawbacks such as complex processes, high cost, low protective performance, and heavy weight, while thermosetting composite underbody protection plates have disadvantages including poor environmental friendliness, slow production cycle, high overall cost, and space occupation by the battery pack. Thermoplastic composite underbody protection plates combine the performance of both metal and thermosetting materials, offering advantages such as good overall protective performance, high cost-effectiveness, environmental friendliness, and fast production cycle, thus becoming the development trend for underbody protection plates in new energy vehicles.

[0003] The mainstream molding path for existing thermoplastic composite bottom panels is: production of flat steel-plastic composite panels—baking—molding—product punching, that is, achieving the special shape and structure of the bottom panel through hot pressing. However, this method has extremely high equipment requirements, with corresponding hardware investments often reaching millions, and the molding cycle is long and the production cycle is slow, resulting in high overall costs.

[0004] Therefore, a bottom protection plate solution is needed to solve this problem. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a combined bottom protection plate, the specific technical solution of which is as follows:

[0006] A combined bottom protective plate for protecting an external enclosure containing battery cells, the bottom protective plate comprising a base plate and edge pads, the base plate including a bearing surface facing the external enclosure; at least a portion of the edge region of the bearing surface is provided with a first connector for connecting the edge pads;

[0007] The edge pad protrudes outward from the bearing surface relative to the outer housing, and is used to support and fix the outer housing in the edge area of ​​the bearing surface.

[0008] In some specific embodiments, the bottom protective plate further includes a mounting pad independent of the substrate, and a second connector for connecting the mounting pad is provided on the non-edge area of ​​the bearing surface;

[0009] The mounting pad protrudes towards the outer casing relative to the bearing surface, and is used to match the structure of the outer casing and support the outer casing in the non-edge area of ​​the bearing surface.

[0010] In some specific embodiments, the connection method of the first connector and / or the second connector includes adhesive connection, injection molding connection, mechanical connection, and welding connection.

[0011] In some specific embodiments, the thickness of the substrate is 1-5 mm.

[0012] In some specific embodiments, the mounting pad and the edge pad have the same or different protrusion heights relative to the bearing surface.

[0013] In some specific embodiments, the protrusion height of the mounting pad relative to the bearing surface does not exceed 25mm.

[0014] In some specific embodiments, the protrusion height of the edge pad relative to the bearing surface does not exceed 25mm.

[0015] In some specific embodiments, the mounting pads and / or the edge pads are made of thermosetting composite materials, thermoplastic composite materials, or metal materials.

[0016] In some specific embodiments, the edge pads are distributed around the edge of the bearing surface.

[0017] In some specific embodiments, the substrate includes a metal plate, a pre-coated metal plate, or a thermoplastic composite plate.

[0018] This utility model has at least the following beneficial effects:

[0019] This invention proposes a modular bottom protector. By rationally designing the structure and connection methods of each unit, an irregularly shaped bottom protector is created. This ensures the protective quality of the bottom protector while reducing production costs and improving production efficiency. The modular manufacturing process eliminates the need for heavy-asset equipment such as ovens, molds, and large presses required by traditional hot-pressing processes, reducing costs associated with equipment purchase, maintenance, and site occupancy, and avoiding the high financial burden of equipment investment. Furthermore, the modular process offers high structural feasibility, fast production cycle, and high processing efficiency, enabling the production of more products per unit time, further reducing production costs. Compared to bottom protectors manufactured using traditional hot-pressing processes, this design offers a significant cost advantage. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the bottom protective plate provided by this utility model;

[0022] Figure 2 A schematic diagram of the structure of the substrate provided by this utility model;

[0023] Figure 3 A schematic diagram of the edge gasket provided by this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the mounting pad provided by this utility model;

[0025] Figure 5 A schematic diagram of the structure of region A provided by this utility model;

[0026] Figure 6 This is a schematic diagram illustrating the fit between the bottom protective plate and the battery cell provided by this utility model.

[0027] Figure label:

[0028] 1-Substrate; 2-Edge pad; 3-Hanging pad; 4-First connector; 5-Second connector; 6-Outer housing; 7-Battery cell. Detailed Implementation

[0029] Various embodiments of the present invention will be described more fully below. The present invention may have various embodiments, and adjustments and changes may be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present invention to the specific embodiments disclosed herein, but rather the present invention should be understood to cover all adjustments, equivalents, and / or alternatives falling within the spirit and scope of the various embodiments of the present invention.

[0030] In the following, the terms “comprising” or “may include”, which may be used in various embodiments of the present invention, indicate the presence of the disclosed functions, operations, or elements, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the present invention, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or the possibility of adding one or more combinations of features, numbers, steps, operations, elements, components, or combinations of the foregoing.

[0031] In various embodiments of this utility model, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0032] The terms used in the various embodiments of this utility model (such as "first," "second," etc.) may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above terms do not limit the order and / or importance of the elements. The above terms are only used for the purpose of distinguishing one element from other elements. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of this utility model, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0033] It should be noted that, in this utility model, unless otherwise explicitly specified and defined, terms such as "installation," "connection," and "fixation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Please refer to Figures 1 to 5 This utility model provides a combined bottom protective plate for protecting an outer casing containing battery cells. The load-bearing relationship between the outer casing containing battery cells and the bottom protective plate is shown in the attached figure. Figure 6 As shown. The specific solution is as follows:

[0035] A modular bottom protective plate is used to protect the outer casing 6 containing the battery cells. The bottom protective plate includes independent base plates 1 and edge pads 2, as shown in the attached diagram. Figure 1 As shown. In some embodiments, the bottom cover plate also includes a mounting pad 3 independent of the substrate 1. The mounting pad 3 is suitable for battery cells with special bottom structures, such as uneven bottoms. To match the uneven bottom structure of the battery cell, the outer casing 6 is also designed to have an uneven bottom surface structure. In this case, the mounting pad 3 can be provided on the bearing surface. The mounting pad 3 is responsible for bearing the uneven bottom surface of the outer casing 6.

[0036] This application divides the bottom cover plate into several independent units according to its structure. These independent unit structures, each with a specific shape and size, are then assembled into the target bottom cover plate product in a certain way. Specifically, the base plate 1 includes a bearing surface facing the outer housing 6; at least a portion of the edges of the base plate 1 are provided with a first connector 4 for connecting the edge pad 2, and the bearing surface is provided with a second connector 5 for connecting the mounting pad 3; the mounting pad 3 protrudes relative to the bearing surface towards the outer housing 6, matching the structure of the outer housing 6 and bearing the outer housing 6 in the non-edge area of ​​the bearing surface; the edge pad 2 protrudes relative to the bearing surface towards the outer housing 6, bearing and fixing the outer housing 6 in the non-edge area of ​​the bearing surface. In this application, the edge pad 2 and the mounting pad 3 cooperate to create a certain space between the outer housing 6 and the bearing surface, effectively replacing the bearing surface to bear the outer housing. The edge pad 2 supports (or bears) the outer housing 6 at the edge of the bearing surface, while the mounting pad 3 serves to bear and support the outer housing 6 in the middle.

[0037] The substrate 1 is the base part of the bottom protective plate and has a bearing surface facing the outer casing 6. The structure of the substrate 1 is shown in the attached figure. Figure 2 As shown. In some specific embodiments, the thickness of the substrate 1 is 1-5mm, which controls costs while ensuring the protective performance of the bottom protective plate. If the substrate 1 is too thin, it may not be able to effectively protect the battery cell 7 and is easily damaged when subjected to external impact, making it difficult to meet the protection requirements for the battery cell 7; while if the substrate 1 is too thick, although it can improve the protective performance, it will increase material costs and increase the overall weight of the bottom protective plate. In addition, this thickness range is compatible with other components of the bottom protective plate (such as edge pads 2 and mounting pads 3) and the external housing 6 and battery cell 7. From the perspective of overall structural stability, a suitable thickness of the substrate 1 can ensure that the components are tightly connected and form a stable protective structure.

[0038] In some embodiments, the substrate 1 includes a metal plate, a pre-coated metal plate, or a thermoplastic composite plate, and may be made of materials such as metal, PCM, PP plate, LFT-D, SMC, etc.

[0039] Metal materials typically possess high strength, good thermal and electrical conductivity, and excellent impact resistance. PCM (Pre-coated Metal Sheet) is a sheet material with an organic coating pre-coated onto the surface of a metal substrate 1. It combines the strength of metal with the decorative and corrosion-resistant properties of organic coatings. The coating can be customized with different colors and textures to achieve a good appearance for the bottom cover. PP sheet is made of polypropylene resin and is lightweight, corrosion-resistant, has good insulation, and high chemical stability. It can buffer external impacts to a certain extent, reducing the impact on the battery cell 7. LFT-D is a sheet material produced by online mixing and direct molding of long fibers (such as glass fiber and carbon fiber) with thermoplastic resin during the molding process. It has high strength, modulus, and good fatigue resistance. The reinforcement of the fibers significantly improves the mechanical properties of the sheet. SMC (Sheet Molding Compound) is a sheet molding material composed of resin, fiber reinforcement materials, fillers, and additives. It has high strength, rigidity, and good heat and corrosion resistance.

[0040] Preferably, the substrate 1 is made of thermoplastic composite material, such as short fiber reinforced thermoplastic composite material, long fiber reinforced thermoplastic composite material, continuous fiber reinforced thermoplastic composite material, etc. Thermoplastic composite materials have good comprehensive performance, possessing good strength, toughness, and plasticity, which can meet the mechanical performance requirements of the bottom protective plate for protecting the battery cell 7, protecting the battery cell 7 under different working environments. Furthermore, they are environmentally friendly, with a relatively environmentally friendly production process, fast production cycle, improved production efficiency, and reduced costs.

[0041] In this application, to avoid direct contact between the substrate 1 and the external housing 6, and to provide sufficient assembly space for the battery cell 7, raised structures are provided in both the edge and non-edge areas of the substrate 1. The raised structures in the edge areas are edge pads 2, and the raised structures in the non-edge areas are mounting pads 3. The different positions of the two types of pads, through the cooperation between the edge and non-edge areas, enhance the stability of the space formed between the substrate 1 and the external housing 6.

[0042] The structure of edge gasket 2 is shown in the attached figure. Figure 3As shown, the edge pad 2 is independent of the substrate 1, and its connection position is at least part of the edge of the substrate 1, achieved through the first connector 4. This connection method ensures that the edge pad 2 and the substrate 1 can be stably combined, and the first connector 4 has various connection methods, including adhesive connection, injection molding connection, mechanical connection, welding connection, etc., which can be flexibly selected according to actual production needs and product performance requirements to ensure the reliability of the connection. The edge pad 2 protrudes from the bearing surface towards the outer housing 6 and is provided with a third connector for connecting to the outer housing 6. The function of the edge pad 2 is to cooperate with the outer housing 6. In practical applications, this protruding structure of the edge pad 2 can cooperate with the outer housing 6 to create a specific housing space for the battery cell 7, which protects the battery cell 7 and also optimizes the overall structural layout. Furthermore, the edge pad 2 can be distributed around the edge of the bearing surface. This surrounding design can form a continuous protective structure along the entire edge of the substrate 1, effectively blocking external foreign objects and protecting the battery cell 7 in all directions. In addition, it can extend in all directions relative to the bearing surface. The extended design increases the contact area between the edge gasket 2 and the outer housing 6, enhances connection stability, and improves the protective effect.

[0043] The edge gasket 2 is equipped with a third connector for connecting the outer housing 6. This design allows the bottom cover plate to be detachably connected to the outer housing 6. Furthermore, the presence of the edge gasket 2 facilitates the disassembly and assembly of the bottom cover plate and the outer housing 6 during installation and maintenance, improving operational convenience. The structure of the outer housing 6 mounted on the edge gasket 2 is shown in the attached figure. Figure 6 As shown. The third connector includes mounting holes on the edge gasket 2 and connecting parts (such as threaded connections, snap-fit ​​connections, etc.) that can be installed into the mounting holes, facilitating the disassembly and assembly of the bottom guard plate and the outer housing 6.

[0044] The mounting pad 3 is also independent of the substrate 1 and is connected to the substrate 1 via a second connector 5 disposed on the bearing surface. The structure of the mounting pad 3 is shown in the attached figure. Figure 4 As shown, it protrudes from the outer casing 6 relative to the bearing surface. Its design purpose is to match the structure of the outer casing 6, thereby better supporting the outer casing 6 and further enhancing the support and protection of the battery cell 7.

[0045] The mounting pad 3 is connected to the substrate 1 via a second connector 5 disposed on the bearing surface of the substrate 1. The second connector 5 can be connected in various ways, including adhesive bonding, injection molding, mechanical bonding, and welding. Different connection methods are suitable for different production scenarios and material properties. For example, adhesive bonding is relatively simple to operate and is suitable for situations where the connection strength requirement is not extremely high and the material is suitable for bonding; mechanical bonding is easy to disassemble, facilitating later maintenance and replacement; welding provides high strength and ensures the stability of the connection.

[0046] The mounting pad 3 protrudes from the outer casing 6 relative to the bearing surface of the substrate 1. This protrusion design is for precise matching of the structure of the outer casing 6. In practical applications, different models and specifications of battery cells 7 have different shape characteristics, and the outer casing 6 also has corresponding shape characteristics. The protruding shape and height of the mounting pad 3 can be customized according to the specific needs of the battery cell 7 to achieve a perfect fit with the outer casing 6. The protruding mounting pad 3 design better adapts to the shape of the battery cell 7 and the outer casing 6 without increasing the overall volume of the bottom protective plate, thus improving space utilization.

[0047] The edge gasket 2 and the mounting gasket 3 can be made of the same or different materials. A wide range of materials can be selected for both gaskets, including thermosetting composites, thermoplastic composites, or metals. Thermosetting composites have high strength and rigidity, and their shape is stable after curing, providing reliable support and protection for the bottom guard plate edges. Thermoplastic composites have good overall performance, combining strength, toughness, and plasticity, and are environmentally friendly and have high production efficiency. Metals have good thermal and electrical conductivity, as well as high strength and impact resistance, effectively protecting the battery cell 7 from external impacts and compression, but they are relatively heavy. Different materials are suitable for different operating environments and performance requirements, and can be selected according to actual conditions.

[0048] In some specific embodiments, the mounting pad 3 and the edge pad 2 have the same or different protrusion heights relative to the bearing surface. The protrusion height can be selected according to actual needs.

[0049] In some specific embodiments, the protrusion height of the mounting pad 3 relative to the bearing surface does not exceed 25mm. The protrusion height of the mounting pad 3 must match the outer contour and installation requirements of the outer casing 6 to ensure that the outer casing 6, which contains the battery cells 7, can be stably placed on the bottom protective plate, avoiding unstable installation and shaking of the battery cells 7 due to excessively high or low protrusion, which could affect their normal operation or even damage them.

[0050] In some specific embodiments, the protrusion height of the edge pad 2 relative to the bearing surface does not exceed 25mm. The 25mm limit ensures that the space can fully accommodate the battery cell 7 without being too high, thus avoiding wasted space or interference with other components, and ensuring the compactness and stability of the entire battery system.

[0051] During the manufacturing process, keeping the protrusion height to no more than 25mm simplifies the production process and controls costs. For the processing of the mounting pad 3 and the edge pad 2, excessively high protrusions may require more complex molds and processing techniques, increasing production difficulty and costs. For example, during injection molding or compression molding, excessively high protrusions may lead to uneven material flow, resulting in defects such as insufficient material or deformation, requiring higher technical requirements and cost investment to ensure product quality. Limiting the protrusion height to within 25mm allows for the use of more conventional and mature production processes, improving production efficiency, reducing scrap rates, and thus effectively controlling production costs.

[0052] In some specific embodiments, the edge pad 2 extends outwards relative to the bearing surface. This outward extension significantly increases the connection area with the outer casing 6. When the edge pad 2 is connected to the outer casing 6 via a third connector, the larger connection area means more connection points can be arranged, resulting in a more robust connection. Simultaneously, this extended design helps improve the overall structural strength of the bottom cover. When the outer casing 6, containing the battery cells 7, is placed on the substrate 1, its weight generates pressure. The outward extension of the edge pad 2 can distribute this pressure more evenly across the entire edge area, preventing excessive localized pressure on the edges of the substrate 1, which could lead to deformation or damage. Furthermore, the outward extension design of the edge pad 2 increases the flexibility and versatility of the bottom cover in terms of installation, allowing for better adaptation to different sizes of outer casing 6.

[0053] In some specific embodiments, edge pads 2 are distributed around the edge of the substrate 1, as shown in the attached figure. Figure 1 and 3 As shown, the complete surrounding distribution creates a continuous and uninterrupted protective barrier around the edge of the substrate 1, effectively blocking foreign objects and enhancing the protection of the battery cell 7, thus ensuring the stability and safety of the battery system. Furthermore, the surrounding distribution makes the connection between the edge pad 2 and the outer casing 6 more stable and uniform. Because the edge pad 2 has a third connector for connecting to the outer casing 6, the complete surrounding layout ensures that the connection points are evenly distributed around the edge of the substrate 1, better dispersing the force between the casing 6 and the bottom protective plate. During production, this surrounding design facilitates manufacturing using standardized production processes and molds. Whether through injection molding, stamping, or other processing methods, the edge pad 2 can be manufactured with relative precision, improving production efficiency and product quality consistency. In the installation phase, the complete surrounding edge pad 2 also reduces installation difficulty, allowing installers to more easily align and fix the bottom protective plate to the outer casing 6, reducing installation errors and improving installation efficiency.

[0054] The first connector 4 is disposed at least part of the edge of the substrate 1 and is a key component for realizing the combination of the substrate 1 and the edge pad 2, ensuring a stable connection between the two, thereby ensuring the stability of the overall structure of the bottom cover plate.

[0055] The second connector 5 is located on the bearing surface of the substrate 1 and is used to accurately install the mounting pad 3 on the substrate 1. It also works in conjunction with the substrate 1 to complete the bearing task of the external housing 6.

[0056] A third connector is provided on the edge gasket 2, which is used to connect the outer housing 6. Through this connector, the bottom guard plate can be tightly connected to the outer housing 6 to form a complete protective structure, safely housing the outer housing 6 inside.

[0057] The first connector 4 and the second connector 5 combine the independent substrate 1, mounting pad 3, and edge pad 2 together, including mechanical connection structures, adhesive connection structures, injection molding connection structures, and welding connection structures. For example, a structural adhesive with high adhesive strength is selected and applied to the connection surface between the substrate 1 and the pad. After curing, a strong adhesive layer is formed, which constitutes the first connector 4 and the second connector 5. Alternatively, after the substrate 1 and the pad are molded separately, a secondary injection molding process is used to inject new plastic into the connection area between the two to achieve connection. The injected plastic constitutes the first connector 4 and the second connector 5. Alternatively, mutually cooperating snap-fit ​​structures, such as protrusions and grooves, are provided on the substrate 1 and the pad respectively. During installation, the snap-fits are aligned and pressed to make them interlock.

[0058] For example, the first connector 4 and the second connector 5 include mounting holes formed on the substrate 1 and connecting components (such as bolts, rivets, etc.) that can be installed into the mounting holes. The mounting holes are shown in the attached diagram. Figure 5 As shown. Whether using mechanical drilling, stamping, or die forming, there are mature technologies and equipment available. Compared to injection-molded bottom plates, the method of creating mounting holes eliminates the need for complex molds, reducing pre-production mold development costs and time, and improving production efficiency. The mounting hole design offers good compatibility, allowing connection to edge gaskets 2 and mounting gaskets 3 made of various materials and in various forms. Whether the gasket is made of thermosetting composite materials, thermoplastic composite materials, or metal, as long as matching holes are created at the appropriate locations, it can be connected using suitable connecting components.

[0059] This invention proposes a modular bottom protector. By rationally designing the structure and connection methods of each unit, an irregularly shaped bottom protector is created. This ensures the protective quality of the bottom protector while reducing production costs and improving production efficiency. The modular manufacturing process eliminates the need for heavy-asset equipment such as ovens, molds, and large presses required by traditional hot-pressing processes, reducing costs associated with equipment purchase, maintenance, and site occupancy, and avoiding the high financial burden of equipment investment. Furthermore, the modular process offers high structural feasibility, fast production cycle, and high processing efficiency, enabling the production of more products per unit time, further reducing production costs. Compared to bottom protectors manufactured using traditional hot-pressing processes, this design offers a significant cost advantage.

[0060] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this utility model.

[0061] Those skilled in the art will understand that the modules in the apparatus of the implementation scenario can be distributed within the apparatus of the implementation scenario as described, or they can be located in one or more apparatuses different from this implementation scenario, with corresponding changes. The modules of the above-described implementation scenario can be combined into one module, or they can be further divided into multiple sub-modules.

[0062] The serial numbers of the above-mentioned utility models are for descriptive purposes only and do not represent the superiority or inferiority of the implementation scenarios.

[0063] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A modular bottom protective plate, characterized in that, For protecting an external enclosure containing battery cells, the bottom protective plate includes an independent base plate and edge pads, the base plate including a bearing surface facing the external enclosure; at least a portion of the edge region of the bearing surface is provided with a first connector for connecting the edge pads; The edge pad protrudes outward from the bearing surface relative to the outer housing, and is used to support and fix the outer housing in the edge area of ​​the bearing surface.

2. The bottom protective plate according to claim 1, characterized in that, The bottom protective plate also includes a mounting pad independent of the substrate, and a second connector for connecting the mounting pad is provided on the non-edge area of ​​the bearing surface; The mounting pad protrudes towards the outer casing relative to the bearing surface, and is used to match the structure of the outer casing and support the outer casing in the non-edge area of ​​the bearing surface.

3. The bottom protective plate according to claim 2, characterized in that, The connection methods of the first connector and / or the second connector include adhesive connection, injection molding connection, mechanical connection, and welding connection.

4. The bottom protective plate according to claim 1, characterized in that, The thickness of the substrate is 1-5 mm.

5. The bottom protective plate according to claim 2, characterized in that, The mounting pad and the edge pad may have the same or different protrusion heights relative to the bearing surface.

6. The bottom protective plate according to claim 2, characterized in that, The protrusion height of the mounting pad relative to the bearing surface shall not exceed 25mm.

7. The bottom protective plate according to claim 1, characterized in that, The protrusion height of the edge pad relative to the bearing surface does not exceed 25mm.

8. The bottom protective plate according to claim 2, characterized in that, The materials of the mounting pads and / or the edge pads include thermosetting composite materials, thermoplastic composite materials, or metal materials.

9. The bottom protective plate according to claim 1, characterized in that, The edge pads are distributed around the edge of the bearing surface.

10. The bottom protective plate according to claim 1, characterized in that, The substrate includes a metal plate, a pre-coated metal plate, or a thermoplastic composite plate.

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