A composite guard plate and battery pack housing assembly

Abstract

This application discloses a composite protective plate and a battery pack housing assembly, belonging to the field of battery pack technology. The composite protective plate includes a first surface layer and a second surface layer. The first surface layer is stacked with a second main body. The second surface layer includes a second main body, a second bent portion, and a second connecting portion. The second connecting portion contacts the side of the first surface layer opposite to the second main body. The second bent portion is connected to the second main body and the second connecting portion, respectively. The composite protective plate includes a first surface layer and a second surface layer along its thickness direction, thereby forming a composite layered structure, which is beneficial to improving the protective performance of the composite protective plate. The second surface layer includes a second main body, a second bent portion, and a second connecting portion. The second connecting portion contacts the side of the first surface layer opposite to the second main body. The second bent portion is connected to the second main body and the second connecting portion, respectively, improving the overall connection stability of the composite protective plate and preventing interlayer separation.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to a composite protective plate and a battery pack housing assembly. Background Technology

[0002] In new energy vehicles, the power battery pack is typically located at the bottom of the vehicle. To reduce the risk of damage to the battery pack from road stones, scrapes, and impacts from foreign objects, a protective plate is usually installed at the bottom of the battery compartment. The protective plate can be made of metal plates or a composite structure formed by multiple layers of plates.

[0003] However, some composite structures have poor overall integrity. During vehicle use, composite protective panels typically need to withstand vibration loads, impact loads, and bottom scratches for extended periods, which can easily lead to delamination or structural damage, thus affecting the overall structural stability and protective effect of the composite protective panel. Summary of the Invention

[0004] This application provides a composite protective plate and a battery pack housing assembly to solve the technical problem that the composite structure has poor integrity and is prone to delamination or structural damage.

[0005] According to a first aspect of this application, a composite protective panel is provided, the composite protective panel comprising a first surface layer and a second surface layer; The second surface layer includes a second main body, a second bent portion, and a second connecting portion. The first surface layer is stacked on top of the second main body. The second bent portion is connected to the second main body and the second connecting portion, respectively. The second connecting portion is connected to the side of the first surface layer opposite to the second main body.

[0006] In some embodiments, the first surface layer includes a first body, a first bent portion, and a first connecting portion, wherein the first connecting portion is closer to the second surface layer than the first body, and the first bent portion is connected to the first body and the first connecting portion, respectively. The second connecting portion is fitted to the side of the first connecting portion away from the second main body, the end of the second connecting portion away from the second bending portion is in contact with the first bending portion, and the surface of the second connecting portion away from the first connecting portion is on the same plane as the surface of the first main body adjacent to the second connecting portion away from the intermediate layer.

[0007] In some embodiments, the composite protective panel further includes an intermediate layer disposed between the first surface layer and the second body; The intermediate layer includes a core portion and a peripheral portion, the peripheral portion surrounding the core portion, and at least a portion of the peripheral portion being located between the first connecting portion and the second main body; The thickness of the core is greater than the thickness of the outer periphery.

[0008] In some embodiments, the core portion includes a honeycomb panel; the peripheral portion includes a honeycomb compacted panel.

[0009] In some embodiments, the intermediate layer further includes a transition portion disposed between the peripheral portion and the core portion, the transition portion being connected to the peripheral portion and the core portion respectively, and the thickness of the transition portion being greater than the thickness of the peripheral portion and less than the thickness of the core portion.

[0010] In some embodiments, the core portion further includes a reinforcing plate located on the side of the honeycomb panel closer to the second body.

[0011] In some embodiments, the composite protective panel further includes an intermediate layer disposed between the first main body and the second main body; The intermediate layer includes a metal plate, and the orthographic projection of the metal plate is offset from the orthographic projection of the first connecting part within the projection surface of the composite protective plate.

[0012] In some embodiments, both the first surface layer and the second surface layer comprise a polypropylene self-reinforcing composite material.

[0013] In some embodiments, an adhesive layer is provided between the first surface layer and the intermediate layer, and between the second surface layer and the intermediate layer.

[0014] According to a second aspect of this application, a battery pack housing assembly is provided, including a battery housing, a composite protective plate provided in the first aspect of this application, and a fastener; The composite protective plate is disposed at the bottom of the battery box and is connected to the battery box via the fastener; The fastener is located in the area corresponding to the second connection part. The fastener includes a bolt and a nut. The nut is fixedly installed at the bottom of the battery box. The bolt passes through the composite protective plate and is connected to the nut. The bolt includes a screw and a nut. The screw includes a first segment and a second segment arranged sequentially along the axial direction. The second segment is connected to the nut and passes through the composite protective plate. The cross-sectional area of ​​the second segment is larger than the cross-sectional area of ​​the first segment and smaller than the cross-sectional area of ​​the nut. The nut is provided with a limiting part at its end near the composite protective plate, and the limiting part is located between the battery box and the composite protective plate.

[0015] In the composite protective plate of this application embodiment, the composite protective plate includes a first surface layer and a second surface layer along the thickness direction, thereby forming a composite layered structure, which is beneficial to improving the protective performance of the composite protective plate. The second surface layer includes a second main body, a second bent portion and a second connecting portion. The second connecting portion contacts the side of the first surface layer opposite to the second main body, and the second bent portion is connected to the second main body and the second connecting portion respectively, thereby improving the overall connection stability of the composite protective plate and preventing interlayer separation.

[0016] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0018] Figure 1 This is a schematic diagram of the structure of the composite protective plate provided in some embodiments of this application; Figure 2 yes Figure 1 Enlarged view of the structure at point A in the image; Figure 3 yes Figure 2 Enlarged view of the structure at point B in the image; Figure 4 This is a schematic diagram of the structure of the composite protective plate provided in some other embodiments of this application; Figure 5 yes Figure 4 Enlarged view of the structure at point C in the image; Figure 6 This is a schematic diagram of the structure of the composite protective plate provided in some embodiments of this application; Figure 7 yes Figure 6 Enlarged view of the structure at point D in the image; Figure 8 This is a schematic diagram of the structure of the battery pack housing assembly provided in some embodiments of this application; Figure 9 This is a schematic diagram showing the connection between the battery box and the composite protective plate provided in some embodiments of this application.

[0019] Explanation of reference numerals in the attached figures: 100. Composite protective panel; 110. First surface layer; 111. First main body; 112. First bending section; 113. First connecting section; 120. Second surface layer; 121. Second main body; 122. Second bending section; 123. Second connecting section; 130. Intermediate layer; 131. Core section; 1311. Honeycomb panel; 1312. Reinforcing plate; 132. Outer perimeter section; 1321. Honeycomb compacted plate; 133. Transition section; 134. Metal plate; 140. Adhesive layer; 200. Battery housing; 300, fastener; 310, bolt; 311, screw; 3111, first rod segment; 3112, second rod segment; 312, nut; 320, nut; 321, limiting part. Detailed Implementation

[0020] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0021] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] In new energy vehicles, the power battery pack is typically located at the bottom of the vehicle. To reduce the risk of damage to the battery pack from road stones, scrapes, and impacts from foreign objects, a protective plate is usually installed at the bottom of the battery compartment. The protective plate can be made of metal plates or a composite structure formed by multiple layers of plates.

[0025] However, some composite structures have poor overall integrity. During vehicle use, composite protective panels typically need to withstand vibration loads, impact loads, and bottom scratches for extended periods, which can easily lead to delamination or structural damage, thus affecting the overall structural stability and protective effect of the composite protective panel.

[0026] Furthermore, commonly used protective plates are mostly made of a composite of steel plates and cushioning material layers. While this type of protective plate can meet the needs of protection and cushioning to a certain extent, it is generally thicker and heavier, which is not conducive to the lightweight design of new energy vehicles, thus affecting the vehicle's range and market competitiveness. At the same time, the material system used in this type of protective plate is also difficult to simultaneously meet the requirements of lightweight, impact resistance, and corrosion resistance.

[0027] This application provides a composite protective plate; please refer to [link / reference]. Figures 1 to 3The composite protective panel 100 includes a first surface layer 110 and a second surface layer 120. The first surface layer 110 is stacked with the second main body 121. The second surface layer 120 includes the second main body 121, a second bending portion 122, and a second connecting portion 123. The second connecting portion 123 contacts the side of the first surface layer 110 away from the second main body 121. The second bending portion 122 is connected to the second main body 121 and the second connecting portion 123 respectively.

[0028] In this embodiment, the composite protective plate 100 includes a first surface layer 110 and a second surface layer 120 along its thickness direction, thereby forming a composite layered structure, which is beneficial to improving the protective performance of the composite protective plate 100. The second surface layer 120 includes a second main body 121, a second bending portion 122, and a second connecting portion 123. The second connecting portion 123 contacts the side of the first surface layer 110 opposite to the second main body 121. The second bending portion 122 is connected to the second main body 121 and the second connecting portion 123 respectively, improving the overall connection stability of the composite protective plate 100 and preventing interlayer separation.

[0029] In some embodiments, please refer to Figure 3 The second bending portion 122 is disposed around the outer edge of the second body 121, and the second bending portion 122 bends and extends toward the first surface layer 110. The second connecting portion 123 is disposed parallel to the second body 121. The edge region of the second body 121, the second bending portion 122, and the second connecting portion 123 together define an accommodating space. The edge region of the first surface layer 110 is located within the accommodating space, so that the first surface layer 110 and the second surface layer 120 form a stable connection. That is, the second connecting portion 123 is located on the side of the first surface layer 110 away from the second body 121 and is connected to the first surface layer 110.

[0030] The thickness of the second main body 121 is 1mm to 2mm, which ensures that the second main body 121 has a certain structural strength while taking into account the need for lightweight.

[0031] The second main body 121, the second bending portion 122, and the second connecting portion 123 are made of the same material and have the same thickness, and are integrally formed, which helps to improve the overall continuity of the second surface layer 120 and the connection reliability between the second main body 121, the second bending portion 122, and the second connecting portion 123.

[0032] In some embodiments, please refer to Figure 3The first surface layer 110 includes a first main body 111, a first bent portion 112, and a first connecting portion 113. The first connecting portion 113 is closer to the second surface layer 120 than the first main body 111. The first bent portion 112 is connected to both the first main body 111 and the first connecting portion 113. The second connecting portion 123 is fitted to the side of the first connecting portion 113 away from the second main body 121. The end of the second connecting portion 123 away from the second bent portion 122 is in contact with the first bent portion 112. The surface of the second connecting portion 123 away from the first connecting portion 113 is on the same plane as the surface of the first main body 111 adjacent to the second connecting portion 123 away from the intermediate layer 130. The first surface layer 110 and the second surface layer 120 fit together at the edge, which can improve the connection stability between the two and help improve the structural strength of the edge area of ​​the composite protective plate 100. The surface of the second connecting part 123 that is away from the first connecting part 113 is on the same plane as the surface of a partially adjacent part of the first main body 111, which can ensure that the surface of the connection is flat.

[0033] The first bending portion 112 is disposed around the outer edge of the first body 111, and extends in a bending direction toward the second body 121. The first connecting portion 113 is disposed parallel to the second body 121, and is located within an accommodating space defined by the edge region of the second body 121, the second bending portion 122, and the second connecting portion 123. The end of the second connecting portion 123 away from the second bending portion 122 is fitted with the first bending portion 112, so that the surface of the second connecting portion 123 facing away from the first connecting portion 113 abuts with the surface of the adjacent portion of the first body 111, thereby forming a continuous and flat outer surface.

[0034] The thickness of the first main body 111 is 1mm to 2mm, which ensures that the first main body 111 has a certain structural strength while taking into account the need for lightweight.

[0035] The first main body 111, the first bent portion 112, and the first connecting portion 113 are made of the same material, have the same thickness, and are integrally formed, which helps to improve the overall continuity of the first surface layer 110 and the connection reliability between the first main body 111, the first bent portion 112, and the first connecting portion 113.

[0036] In some embodiments, please refer to Figure 1 The composite protective panel 100 also includes an intermediate layer 130, which is disposed between the first surface layer 110 and the second main body 121. By providing the intermediate layer 130, the overall structural strength of the composite protective panel 100 can be improved.

[0037] In some examples, please refer to Figure 3The first connecting portion 113 and the second main body 121 are spaced apart to form a space between them for accommodating the intermediate layer 130. At this time, at least a portion of the intermediate layer 130 is located between the first connecting portion 113 and the second main body 121, and the thickness of the intermediate layer 130 at this location is reduced relative to the thickness of the intermediate layer 130 in other areas of the composite protective plate 100. Retaining the intermediate layer 130 in the edge region can improve the structural support of the composite protective plate 100 in the edge region.

[0038] In other examples, the first connecting portion 113 is fitted to the second body 121 without forming a gap between them; that is, no intermediate layer 130 is provided between the first connecting portion 113 and the second body 121. Eliminating the intermediate layer 130 in the edge region simplifies the structure of the composite protective panel 100 in the edge region and facilitates lightweight structural design.

[0039] In some embodiments, please refer to Figure 2 The intermediate layer 130 includes a core portion 131 and a peripheral portion 132. The peripheral portion 132 surrounds the core portion 131, and at least a portion of the peripheral portion 132 is located between the first connecting portion 113 and the second main body 121. The thickness of the core portion 131 is greater than the thickness of the peripheral portion 132, thereby providing greater structural support in the core region and making the structure of the peripheral region more suitable for the arrangement of edge connections.

[0040] The core portion 131 has the same thickness at all points, and the outer portion 132 has the same thickness at all points. There is a thickness difference between the core portion 131 and the outer portion 132, and the composite protective plate 100 also forms a corresponding thickness difference in the areas corresponding to the core portion 131 and the outer portion 132, and the thickness variation trend of the composite protective plate 100 is consistent with the thickness variation trend of the intermediate layer 130.

[0041] The thickness variation of the intermediate layer 130 is mainly observed on the side closest to the first main body 111. The first main body 111 itself is a plate-like structure with a uniform thickness, but the position of the first main body 111 along the thickness direction varies accordingly with the thickness variation of the intermediate layer 130 in different regions to accommodate the thickness difference between the core portion 131 and the outer portion 132. Therefore, the overall thickness variation of the composite protective plate 100 is mainly observed on the side where the first main body 111 is located. In contrast, the side of the intermediate layer 130 closest to the second main body 121 is flat, and the second main body 121 is a flat plate structure with a uniform thickness, thus forming a flat surface on the side where the composite protective plate 100 is located.

[0042] The core component 131 includes a honeycomb panel 1311 to provide better structural support while also meeting lightweight requirements. Exemplarily, the honeycomb panel 1311 can have a cell diameter of 2mm to 5mm, a porosity of 85% to 90%, a cell shape of hexagonal or circular, a cell wall thickness of 0.1mm to 0.3mm, and a density of 60kg / m³. 3 ~150kg / m 3 .

[0043] The outer perimeter 132 includes a honeycomb compacted plate 1321, which is integrally set with the honeycomb panel 1311. This helps to improve the continuity of the overall structure of the intermediate layer 130 and improve the connection reliability between the outer perimeter 132 and the core 131.

[0044] In some embodiments, please refer to Figure 2 The intermediate layer 130 also includes a transition portion 133 disposed between the outer portion 132 and the core portion 131. The transition portion 133 is connected to the outer portion 132 and the core portion 131 respectively. The thickness of the transition portion 133 is greater than the thickness of the outer portion 132 and less than the thickness of the core portion 131, so that the intermediate layer 130 forms a smooth transition between the outer portion 132 and the core portion 131, thereby improving the continuity of the overall structure of the intermediate layer 130.

[0045] In some embodiments, the transition portion 133 includes a semi-compressed honeycomb panel, the degree of compaction of which is lower than that of the compacted honeycomb panel 1321 of the outer perimeter portion 132, so that the thickness of the transition portion 133 is greater than the thickness of the outer perimeter portion 132 but less than the thickness of the core portion 131. The core portion 131, the transition portion 133, and the outer perimeter portion 132 are integrally disposed, which is beneficial to improving the continuity and integrity of the overall structure of the intermediate layer 130, and also beneficial to improving the connection strength between the core portion 131, the transition portion 133, and the outer perimeter portion 132.

[0046] The thickness of the transition portion 133 gradually decreases from the side closer to the core portion 131 to the side closer to the outer portion 132, so as to form a thickness transition between the core portion 131 and the outer portion 132, which helps to mitigate the thickness change between the core portion 131 and the outer portion 132.

[0047] When the intermediate layer 130 adopts only a honeycomb structure, the maximum thickness of the intermediate layer 130 is 5 mm to 10 mm, which is beneficial to ensure that the intermediate layer 130 has a certain structural support capacity while taking into account the lightweight requirements.

[0048] Specifically, when the intermediate layer 130 adopts only a honeycomb structure, the maximum thickness of the intermediate layer 130 is any one or any two of the following: 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, and 10mm.

[0049] In some embodiments, please refer to Figure 4 and Figure 5 The core 131 also includes a reinforcing plate 1312, which is located on the side of the honeycomb panel 1311 near the second main body 121 and is in contact with the second main body 121. By providing the reinforcing plate 1312, the structural strength of the corresponding area of ​​the core 131 can be improved, thereby improving the protective capability of the corresponding area of ​​the composite protective panel 100.

[0050] The reinforcing plate 1312 can be made of aluminum plate, while the honeycomb plate 1311, the honeycomb compacted plate 1321, and the semi-compacted honeycomb plate can be made of polypropylene honeycomb material (PP honeycomb material). Aluminum plate is beneficial for providing structural support in the corresponding area, while PP honeycomb material is beneficial for reducing the weight of the intermediate layer 130, thus balancing the requirements of structural strength and lightweighting.

[0051] Within the projection plane of the second main body 121, the orthographic projection of the reinforcing plate 1312 is located within the orthographic projection range of the honeycomb plate 1311, that is, the reinforcing plate 1312 is disposed within the area where the honeycomb plate 1311 is located.

[0052] When the intermediate layer 130 adopts a honeycomb structure and a reinforcing plate 1312 composite form, the maximum thickness of the intermediate layer 130 is 6mm to 19mm, which is beneficial to ensure that the intermediate layer 130 has good structural support capabilities while taking into account the requirements of lightweighting.

[0053] Specifically, when the intermediate layer 130 adopts a composite form of honeycomb structure and reinforcing plate 1312, the maximum thickness of the intermediate layer 130 is any one or any two of the following: 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, and 19mm.

[0054] In other embodiments, please refer to Figure 6 and Figure 7 The composite protective panel 100 also includes an intermediate layer 130, which is disposed between the first main body 111 and the second main body 121. By providing the intermediate layer 130, the overall structural strength of the composite protective panel 100 can be improved.

[0055] The intermediate layer 130 includes a metal plate 134. Within the projection plane of the composite protective plate 100, the orthographic projection of the metal plate 134 is offset from the orthographic projection of the first connecting part 113, thereby reserving space for the arrangement of the first connecting part 113 and reducing the risk of interference between the metal plate 134 and the first connecting part 113.

[0056] The outer edge of the metal plate 134 is in contact with the first connecting part 113, so that the first connecting part 113 and the metal plate 134 are connected. The two work together to continuously cover the second main body 121, which helps to improve the structural strength of the composite protective plate 100.

[0057] In this embodiment, the composite protective plate 100 has a uniform thickness throughout, and no intermediate layer 130 is provided between the first connecting part 113 and the second main body 121, which helps to simplify the structure of the composite protective plate 100 and simplify the processing technology.

[0058] The metal plate 134 can be made of steel or aluminum to ensure the structural strength of the composite protective plate 100.

[0059] When the intermediate layer 130 uses only metal plate 134, if the metal plate 134 is made of steel, the thickness of the steel plate can be 0.5mm to 1.2mm, and the steel plate grade can be DP590, DP780, DP980, or DP1180. If the metal plate 134 is made of aluminum, the thickness of the aluminum plate can be 0.5mm to 2.5mm, and the aluminum plate can be 5-series or 6-series aluminum.

[0060] In some embodiments, both the first surface layer 110 and the second surface layer 120 comprise self-reinforced polypropylene (SRPP). Self-reinforced polypropylene refers to a composite material in which both the reinforcing phase and the matrix are polypropylene systems; for example, SRPP material can be composed of polypropylene fibers (PP fibers) and polypropylene resin (PP resin). Using SRPP to fabricate the first surface layer 110 and the second surface layer 120 helps reduce the overall weight of the composite protective panel 100 and improves its impact resistance, recyclability, and corrosion resistance.

[0061] More specifically, PP fibers can be used in twill weave fabrics with a fiber areal density of 100 g / m². 2 ~120g / m 2 The melt index of PP resin is 5 g / 10 min ~ 10 g / 10 min, which was measured under test conditions of 230 degrees Celsius and 2.16 kg load.

[0062] In some embodiments, an adhesive layer 140 is provided between the first surface layer 110 and the intermediate layer 130, and between the second surface layer 120 and the intermediate layer 130. The adhesive layer 140 may be formed of a hot melt adhesive film, thereby achieving a stable connection between the first surface layer 110, the second surface layer 120 and the intermediate layer 130.

[0063] The thickness of the adhesive layer 140 can be 0.1mm to 0.3mm.

[0064] An adhesive layer 140 may also be provided between the first connecting part 113 and the second connecting part 123 to improve the connection stability between the two.

[0065] Secondly, embodiments of this application provide a battery pack housing assembly; please refer to [link to relevant documentation]. Figure 8 and Figure 9 The battery pack housing assembly includes a battery box 200, a composite protective plate 100 provided in the first aspect of this application, and a fastener 300. The composite protective plate 100 is disposed at the bottom of the battery box 200 and connected to the battery box 200 via the fastener 300. The fastener 300 is located in the area corresponding to the second connecting portion 123, and includes a bolt 310 and a nut 320. The nut 320 is fixedly disposed at the bottom of the battery box 200, and the bolt 310 passes through the composite protective plate 100 and is connected to the nut 320. A limiting portion 321 is provided at the end of the nut 320 near the composite protective plate 100, and the limiting portion 321 is located between the battery box 200 and the composite protective plate 100.

[0066] In this embodiment, the composite protective plate 100 is disposed at the bottom of the battery box 200 to protect the battery box 200, and the fastener 300 is used to achieve a stable connection between the composite protective plate 100 and the battery box 200. Since the intermediate layer 130 of the composite protective plate 100 has thickness differences in different areas, and the surface of the composite protective plate 100 facing the battery box 200 has different heights in different areas, when the thickness of the composite protective plate 100 varies, the limiting part 321 is provided to limit the gap between the battery box 200 and the composite protective plate 100, avoiding interference between the battery box 200 and the higher areas of the composite protective plate 100, which helps to improve the assembly stability between the two.

[0067] Nut 320 can be a rivet nut.

[0068] The first main body 111 is positioned closer to the battery box 200 than the second main body 121, so that the thickness variation of the composite protective plate 100 is mainly reflected on the side closer to the battery box 200, giving the battery pack housing assembly a relatively flat shape after assembly.

[0069] The limiting part 321 is continuously arranged around the nut 320 in the circumferential direction. The length of the limiting part 321 in the thickness direction of the composite protective plate 100 is not less than the difference between the maximum thickness and the minimum thickness of the composite protective plate 100, so as to avoid interference between the battery box 200 and the higher area of ​​the composite protective plate 100.

[0070] In some embodiments, the bolt 310 includes a screw 311 and a nut 312. The nut 312 is connected to the screw 311 and is located on the side of the composite protective plate 100 away from the battery box 200. The nut 312 can limit the movement of the screw 311 in the direction toward the battery box 200, thereby preventing the screw 311 from extending excessively into the battery box 200.

[0071] In some embodiments, the screw 311 includes a first segment 3111 and a second segment 3112 arranged sequentially along the axial direction of the screw 311. The second segment 3112 is connected to the nut 312 and passes through the composite protective plate 100. The cross-sectional area of ​​the second segment 3112 is larger than that of the first segment 3111, and smaller than that of the nut 312. Here, "cross-section" refers to a section perpendicular to the axial direction of the screw 311. In other words, the orthographic projection of the first segment 3111 onto the surface of the nut 312 lies within the orthographic projection range of the second segment 3112 onto the surface of the nut 312. This helps to improve the local load-bearing capacity of the corresponding area of ​​the composite protective plate 100, disperse local stress, and reduce torque attenuation after the bolt 310 is tightened. The orthographic projection of the second segment 3112 onto the surface of the nut 312 lies within the contour of the nut 312 to maintain the limiting function of the nut 312.

[0072] In some embodiments, the two ends of the second rod segment 3112 extend from opposite sides of the surface of the composite protective plate 100 along the axial direction of the screw 311, with each extension amount being 0.02mm to 0.3mm. Through this arrangement, during the installation of the composite protective plate 100, the second rod segment 3112 can preferentially contact the limiting part 321 and primarily bear the connection load, rather than the composite protective plate 100 primarily bearing the connection load. This helps reduce torque attenuation after the bolt 310 is tightened due to deformation, creep, etc., of the composite protective plate 100. The second rod segment 3112 can also cooperate with the limiting part 321 to limit excessive movement of the screw 311 towards the battery box 200, preventing the screw 311 from excessively extending into the battery box 200. Simultaneously, the second rod segment 3112 can also provide support at the connection point of the composite protective plate 100, helping to ensure that the composite protective plate 100 maintains a predetermined thickness at the connection point, thereby ensuring the structural stability of the connection area.

[0073] The battery pack housing assembly has all the beneficial effects of the aforementioned composite protective plate 100, which will not be repeated here.

[0074] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0075] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0076] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A composite armor panel, characterized by, The composite protective panel (100) includes a first surface layer (110) and a second surface layer (120). The second surface layer (120) includes a second main body (121), a second bent portion (122), and a second connecting portion (123). The first surface layer (110) is stacked with the second main body (121). The second bent portion (122) is connected to the second main body (121) and the second connecting portion (123) respectively. The second connecting portion (123) is connected to the side of the first surface layer (110) away from the second main body (121).

2. The composite armor panel of claim 1, wherein, The first surface layer (110) includes a first body (111), a first bending portion (112) and a first connecting portion (113). The first connecting portion (113) is closer to the second surface layer (120) than the first body (111). The first bending portion (112) is connected to the first body (111) and the first connecting portion (113) respectively. The second connecting portion (123) is fitted to the side of the first connecting portion (113) away from the second main body (121). The end of the second connecting portion (123) away from the second bending portion (122) is in contact with the first bending portion (112). The surface of the second connecting portion (123) away from the first connecting portion (113) is on the same plane as the surface of the first main body (111) adjacent to the second connecting portion (123) away from the intermediate layer (130).

3. The composite protective plate according to claim 2, characterized in that, The composite protective panel (100) further includes an intermediate layer (130), which is disposed between the first surface layer (110) and the second main body (121); The intermediate layer (130) includes a core portion (131) and a peripheral portion (132), the peripheral portion (132) surrounding the core portion (131), and at least a portion of the peripheral portion (132) being located between the first connecting portion (113) and the second main body (121); The thickness of the core portion (131) is greater than the thickness of the peripheral portion (132).

4. The composite protective plate according to claim 3, characterized in that, The core (131) includes a honeycomb panel (1311); the peripheral (132) includes a honeycomb compacted panel (1321).

5. The composite protective plate (100) according to claim 3, characterized in that, The intermediate layer (130) further includes a transition portion (133) disposed between the peripheral portion (132) and the core portion (131). The transition portion (133) is connected to the peripheral portion (132) and the core portion (131) respectively. The thickness of the transition portion (133) is greater than the thickness of the peripheral portion (132) and less than the thickness of the core portion (131).

6. The composite protective plate according to claim 4, characterized in that, The core (131) also includes a reinforcing plate (1312) located on the side of the honeycomb panel (1311) near the second body (121).

7. The composite protective plate according to claim 2, characterized in that, The composite protective panel (100) further includes an intermediate layer (130), which is disposed between the first main body (111) and the second main body (121); The intermediate layer (130) includes a metal plate (134), and the orthographic projection of the metal plate (134) is offset from the orthographic projection of the first connecting part (113) within the projection surface of the composite protective plate (100).

8. The composite protective plate according to claim 1, characterized in that, Both the first surface layer (110) and the second surface layer (120) comprise a polypropylene self-reinforcing composite material.

9. The composite protective plate according to claim 1, characterized in that, An adhesive layer (140) is provided between the first surface layer (110) and the intermediate layer (130), and between the second surface layer (120) and the intermediate layer (130).

10. A battery pack housing assembly, characterized in that, It includes a battery housing (200), a composite protective plate (100) as described in any one of claims 1 to 9, and a fastener (300). The composite protective plate (100) is disposed at the bottom of the battery box (200) and is connected to the battery box (200) through the fastener (300); The fastener (300) is located in the area corresponding to the second connecting part (123). The fastener (300) includes a bolt (310) and a nut (320). The nut (320) is fixedly disposed at the bottom of the battery box (200). The bolt (310) passes through the composite protective plate (100) and is connected to the nut (320). The bolt (310) includes a screw (311) and a nut (312). The screw (311) includes a first rod segment (3111) and a second rod segment (3112) arranged sequentially along the axial direction. The second rod segment (3112) is connected to the nut (312). The second rod segment (3112) passes through the composite protective plate (100). The cross-sectional area of ​​the second rod segment (3112) is larger than the cross-sectional area of ​​the first rod segment (3111) and smaller than the cross-sectional area of ​​the nut (312). The nut (320) is provided with a limiting part (321) near the end of the composite protective plate (100), and the limiting part (321) is located between the battery box (200) and the composite protective plate (100).

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