Buffer plate configured for connecting to battery bottom protective plate, and battery pack

Abstract

The present utility model relates to the technical field of new energy vehicle accessories, and more specifically, to a buffer plate configured for connecting to a battery bottom protective plate, and a battery pack. The buffer plate comprises a foam material layer and protective layers which are respectively connected to the upper and lower surfaces of the foam material layer, wherein each protective layer comprises a plurality of continuous fiber-reinforced resin composite material layers, and the projections on the horizontal plane of the fiber lengthwise directions of two adjacent continuous fiber-reinforced resin composite material layers have an included angle therebetween. Because the projections on the horizontal plane of the fiber lengthwise directions of two adjacent continuous fiber-reinforced resin composite material layers have an included angle therebetween, fibers in each continuous fiber-reinforced resin composite material layer form a dense, multi-angle interwoven structure. When the buffer plate is subjected to an external impact, energy can be absorbed by means of interlayer shearing force and delamination, thereby avoiding damage and collapse, and effectively protecting the bottom protective plate and a tray. The battery pack comprises the buffer plate, and therefore has a better impact resistance and waterproof performance.

Description

A buffer plate for connection with a battery bottom protector and a battery pack Technical Field

[0001] This utility model relates to the field of new energy vehicle parts technology, and more specifically, to a buffer plate for connecting with the battery bottom guard plate and a battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle market, the safety performance of new energy electric vehicles has become a focus of consumer attention. The underbody protection plate is a protective structure installed at the bottom of the electric vehicle. Connected to the chassis, it primarily protects critical components such as the battery pack and motor from impacts and damage from external objects. As a crucial component of new energy electric vehicles, the safety of the underbody protection plate directly affects the overall performance of the vehicle and the safety of its passengers.

[0003] Currently, the most common bottom protection plate materials on the market are metal. However, metal materials undergo significant deformation upon impact, which can cause considerable damage to the tray and battery cells. Therefore, a cushioning plate made of foam material is usually added between the bottom protection plate and the tray to improve the impact resistance of the bottom protection plate and reduce damage to the internal structure caused by deformation. However, the structural strength of foam material alone is insufficient. When encountering a hard object that causes significant deformation, the cushioning plate made of foam material alone is prone to collapse and failure, and cannot provide a good cushioning effect.

[0004] Utility Model Content

[0005] To overcome the problem of insufficient strength of the buffer plate used for connection with the car underbody protection plate in the prior art, this utility model provides a buffer plate for connection with the battery underbody protection plate, which can effectively protect the underbody protection plate and the tray.

[0006] Another objective of this invention is to provide a battery pack.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a buffer plate for connecting with the bottom cover plate of a battery, comprising a foamed material layer and a protective layer respectively connected to the upper and lower surfaces of the foamed material layer, wherein the protective layer comprises multiple layers of continuous fiber reinforced resin composite material, and the projections of the fiber length directions of two adjacent layers of continuous fiber reinforced resin composite material on the horizontal plane have an included angle.

[0008] In this invention, protective layers are provided on the upper and lower surfaces of the foamed material layer. These protective layers comprise multiple layers of continuous fiber-reinforced resin composite material. The continuous fiber-reinforced resin composite material layers enhance the structural strength of the foamed material layer and improve the waterproof performance of the buffer plate, effectively protecting the battery pack. Because the projections of the fiber length directions of adjacent continuous fiber-reinforced resin composite material layers onto the horizontal plane form an angle, the fibers in each continuous fiber-reinforced resin composite material layer form a dense structure with multiple angled intersections. When the buffer plate is subjected to external impact, it can absorb energy through the shear force and delamination between the layers, preventing damage and collapse, and effectively protecting the bottom plate and tray.

[0009] Furthermore, the protective layer comprises an even number of continuous fiber reinforced resin composite material layers, each of which is symmetrically arranged along the middle plane of the protective layer; or the protective layer comprises an odd number of continuous fiber reinforced resin composite material layers, each of which is symmetrically arranged along the middle continuous fiber reinforced resin composite material layer.

[0010] In this design, the impact resistance of the buffer plate is further improved by using symmetrically arranged continuous fiber-reinforced resin composite material layers.

[0011] Furthermore, the included angle ranges from 20° to 90°.

[0012] In the above scheme, the included angle between the projections of the fiber length directions of two adjacent continuous fiber reinforced resin composite material layers on the horizontal plane is preferably 20° to 90°, which has good impact resistance.

[0013] Furthermore, the sides of the foamed material layer and the protective layer are also connected to an edge sealing plate, the edge sealing plate comprising a continuous fiber reinforced resin composite material layer.

[0014] In the above solution, the foam material layer can be fully wrapped and protected by the edge sealing board and the protective layer, which improves the waterproof performance and impact resistance of the buffer board.

[0015] Furthermore, an adhesive layer connects the foamed material layer and the protective layer.

[0016] In the above solution, the foam material layer and the protective layer are connected by an adhesive layer to prevent the protective layer from falling off.

[0017] Furthermore, the thickness of the foamed material layer is 2.0 mm to 10.0 mm, and the thickness of the protective layer is 0.15 mm to 0.60 mm.

[0018] Furthermore, the continuous fiber used in the continuous fiber reinforced resin composite layer is at least one of glass fiber, carbon fiber, and aramid fiber; the resin used in the continuous fiber reinforced resin composite layer is at least one of polyethylene, polypropylene, polyamide, acrylonitrile-butadiene-styrene resin, polyvinyl chloride, polystyrene, polyethylene terephthalate, and polycarbonate; and the foaming material of the foaming material layer is at least one of PP, PET, PE, EVA, PVC, and rubber.

[0019] Furthermore, the foamed material layer and the protective layer are joined by heat fusion.

[0020] In the above solution, the connection strength can be improved by hot-melt bonding between the foam material layer and the protective layer.

[0021] Furthermore, the edge banding is connected to the sides of the foam material layer and the protective layer by heat fusion.

[0022] In the above solution, the edge banding board, foam material layer, and protective layer are connected by hot-melt bonding to improve the connection strength.

[0023] Furthermore, the edge sealing plate has an adhesive injection groove on the side facing the foam material layer and the protective layer.

[0024] In the above solution, since the edge banding has an injection groove on one side, when connecting, the adhesive can be applied to the surface of the edge banding and the injection groove can be filled with adhesive. Then, the edge banding is connected to the side of the foam material layer and the protective layer. The edge banding is gently squeezed so that the adhesive in the injection groove seeps into the gap, thus avoiding connection failure due to insufficient adhesive application.

[0025] Furthermore, the upper and lower ends of the edge sealing plate are provided with positioning protrusions extending horizontally toward the protective layer, and the side of the protective layer is provided with positioning recesses corresponding to the positions of the positioning protrusions, and the positioning protrusions and positioning recesses are matched and connected.

[0026] In the above solution, since the two ends of the edge banding are provided with positioning protrusions and the corresponding sides of the protective layer are provided with positioning recesses, the edge banding can be quickly positioned by matching and connecting the positioning protrusions and positioning recesses, so as to facilitate connection, and at the same time play a limiting role in the vertical direction.

[0027] Furthermore, the positioning protrusion has a horizontal positioning surface, a first engaging portion is provided on the horizontal positioning surface, and the positioning recess has a second engaging portion corresponding to the position of the first engaging portion. The first engaging portion and the second engaging portion engage in a vertical direction.

[0028] In the above solution, the first snap-fit ​​part and the second snap-fit ​​part are snapped together in the vertical direction. Since the first snap-fit ​​part is set on the horizontal positioning surface, it can limit the edge sealing plate in the horizontal direction, so that the edge sealing plate can be quickly positioned and snapped onto the side of the foam material layer and the protective layer for connection.

[0029] Furthermore, the first snap-fit ​​part is a snap-fit ​​strip, and the second snap-fit ​​part is a snap-fit ​​groove.

[0030] In the above solution, the interlocking strip and interlocking groove can be used to achieve a longer interlocking length along the edge of the buffer plate, so that the edge sealing plate can be accurately positioned to fit the sides of the foam material layer and the protective layer for connection.

[0031] This utility model also provides a battery pack that uses the buffer plate described in any of the above-mentioned embodiments for connecting the battery bottom protection plate. The buffer plate is connected between the battery bottom protection plate and the tray, which can improve the impact resistance and waterproof performance of the battery pack.

[0032] Compared with the prior art, the beneficial effects of this utility model are:

[0033] 1. The buffer plate of this utility model for connecting with the bottom guard plate of the battery has a protective layer on the upper and lower surfaces of the foamed material layer. The protective layer includes multiple layers of continuous fiber reinforced resin composite material. The continuous fiber reinforced resin composite material layer enhances the structural strength of the foamed material layer and improves the waterproof performance of the buffer plate, thus effectively protecting the battery pack.

[0034] 2. The buffer plate of this utility model, used for connection with the battery bottom cover plate, has an angle between the projections of the fiber length directions of adjacent continuous fiber reinforced resin composite material layers onto the horizontal plane, resulting in a dense structure with multi-angle intersections of the fibers in each continuous fiber reinforced resin composite material layer. When the buffer plate is subjected to external impact, it can absorb energy through the shear force and delamination between layers, avoiding damage and collapse, and effectively protecting the bottom cover plate and tray.

[0035] 3. The buffer plate of this utility model, which is used to connect with the bottom guard plate of the battery, further improves the impact resistance of the buffer plate by setting a symmetrical continuous fiber reinforced resin composite material layer structure.

[0036] 4. The battery pack of this utility model uses the above-mentioned buffer plate connected between the battery bottom protective plate and the tray, which can improve the impact resistance and waterproof performance of the battery pack. Attached Figure Description

[0037] Figure 1 is a cross-sectional view of the buffer plate of this utility model used for connection with the battery bottom guard plate;

[0038] Figure 2 is a schematic diagram of the structure of the continuous fiber reinforced resin composite layer;

[0039] Figure 3 is an exploded view of the protective layer;

[0040] Figure 4 is an enlarged view of section B in Figure 1.

[0041] In the attached diagram: 1. Foamed material layer; 2. Protective layer; 21. Continuous fiber reinforced resin composite material layer; 22. Positioning recess; 23. Second snap-fit ​​part; 3. Adhesive layer; 4. Edge sealing plate; 41. Glue injection groove; 42. Positioning protrusion; 43. First snap-fit ​​part. Embodiments of the present invention

[0042] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0043] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0044] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings:

[0045] Referring to Figure 1, this embodiment discloses a buffer plate for connection with a battery bottom cover plate, including a foam material layer 1 and a protective layer 2 respectively connected to the upper and lower surfaces of the foam material layer 1. The protective layer 2 includes a continuous fiber reinforced resin composite material layer 21.

[0046] The continuous fiber reinforced resin composite layer 21 is obtained by laying continuous fibers in a direction within resin and then cooling it; this preparation method is existing technology. The continuous fiber is at least one of glass fiber, carbon fiber, and aramid fiber, preferably glass fiber, with a content of 55%–75%. The resin is polyethylene, polypropylene, polyamide, or acrylonitrile. butadiene The resin comprises at least one of styrene resin, polyvinyl chloride, polystyrene, polyethylene terephthalate, and polycarbonate. Preferably, the resin is a copolymer polypropylene resin, which has high impact resistance. The copolymer polypropylene resin has a melt index of 40-80 g / 10min at 190°C and 2.16 kg, which allows for good wetting of the resin and fiber, improving the load-bearing capacity of the buffer plate.

[0047] The base resin of the foamed material layer 1 is at least one of the following raw materials: PP, PET, PE, EVA, PVC, and rubber. It is produced through physical foaming or cross-linking foaming, resulting in a large number of fine foam particles in the plastic and rubber, increasing volume and decreasing density. This preparation method is existing technology. Depending on actual needs, the foamed material layer 1 can have a density of 100±30 kg / m³, a thickness of 2.0–10.0 mm, a Rockwell hardness of 80±20, and a compressive strength of 0.1–4.0 MPa.

[0048] Referring to Figures 2 and 3, the protective layer 2 comprises multiple layers of continuous fiber-reinforced resin composite material 21, wherein the projections of the fiber length directions of adjacent layers of continuous fiber-reinforced resin composite material 21 onto the horizontal plane form an angle. The number of continuous fiber-reinforced resin composite material layers 21 can be three, four, five, or six, or more layers may be added depending on the thickness of the product.

[0049] Because the projections of the fiber length directions of two adjacent continuous fiber reinforced resin composite material layers 21 onto the horizontal plane form an angle, the fibers in each continuous fiber reinforced resin composite material layer 21 form a dense structure with multiple angles intersecting. When the buffer plate is subjected to external impact, it can absorb energy through the shear force and delamination between layers, avoiding damage and collapse, and effectively protecting the bottom plate and pallet.

[0050] As shown in Figures 2 and 3, the fiber orientation in the single continuous fiber reinforced resin composite layer 21 is consistent.

[0051] Referring further to Figure 3, the diagram shows an exploded view of the protective layer 2 after its layers have been separated. In an optional embodiment, the protective layer 2 can be divided into six continuous fiber-reinforced resin composite material layers 21, with the six layers divided into upper and lower groups by the central section AA. These two groups are symmetrically arranged along section AA, and each group comprises three continuous fiber-reinforced resin composite material layers 21. In other embodiments, the protective layer 2 may also comprise other numbers of continuous fiber-reinforced resin composite material layers 21, such as three, four, or five layers, stacked sequentially. Preferably, when there are an even number of layers, each continuous fiber-reinforced resin composite material layer 21 can be symmetrically arranged along the middle surface of the protective layer. When there are an odd number of layers, each continuous fiber-reinforced resin composite material layer 21 can be symmetrically arranged along the middle continuous fiber-reinforced resin composite material layer 21.

[0052] For adjacent continuous fiber-reinforced resin composite material layers 21 located in the same group, their fiber directions are intersecting, and their projections in the horizontal plane have an angle, which is preferably in the range of 20° to 90°, so as to have better impact resistance.

[0053] For example, in this embodiment, as shown in Figure 3, the fiber orientation angle between adjacent continuous fiber-reinforced resin composite layers 21 is 90°. In other embodiments, the angle can be selected as 20°, 60°, or other preferred angles.

[0054] Optionally, the foam material layer 1 and the protective layer 2 are joined by heat fusion. Heat fusion is an existing joining process. The joining surfaces of the protective layer 2 and the foam material layer 1 are heated to a molten state, and then the two are brought into contact and cooled to set. Since both the protective layer 2 and the foam material layer 1 contain resin material, they have good adhesion, and heat fusion can effectively connect and fix them, thereby improving the connection strength. In other solutions, the foam material layer 1 and the protective layer 2 can also be joined by an intermediate connecting layer.

[0055] In this design, the sides of the foam material layer 1 and the protective layer 2 are also connected to edge sealing plates 4. Using edge sealing plates 4 for edge sealing allows the edge sealing plates 4 and the protective layer 2 to provide all-around protection for the foam material layer 1, improving the waterproof performance of the buffer plate. The battery bottom protector is mainly used to protect key components such as the battery pack and motor from impacts and damage from external objects. In this embodiment, the buffer plate connects the bottom protector to the tray, which not only improves the battery pack's resistance to impact and deformation but also enhances the waterproof capability of the battery pack's bottom, thereby improving the battery pack's safety. Therefore, the waterproof performance and impact resistance of the buffer plate play a crucial role in the safe use of the battery pack.

[0056] Preferably, the edge banding 4 and the protective layer 2 have the same laminated structure. Both the edge banding 4 and the protective layer 2 are laminated structures of continuous fiber-reinforced resin composite material layers 21, which can improve the overall impact resistance.

[0057] Optionally, the edge banding 4 is joined to the sides of the foam material layer 1 and the protective layer 2 by heat fusion. The heat fusion joining method is the same as that described above and is existing technology. By heat fusion joining the edge banding 4, the connection and fixation can be effectively achieved, thereby improving the overall connection strength. In some other solutions, adhesive bonding can also be used.

[0058] Referring to Figures 1 and 4, an adhesive layer 3 connects the foam material layer 1 and the protective layer 2. The adhesive layer 3 can be a PP film, which facilitates the connection between the foam material layer 1 and the protective layer 2. Furthermore, since the adhesive layer can use the same base resin material as both the foam material layer 1 and the protective layer 2, it exhibits good adhesion and a stable connection, preventing the protective layer 2 from detaching. When the foam material layer 1 and the protective layer 2 are joined using a heat-fusion bonding method, the PP film can further enhance the tightness and stability of the connection.

[0059] Referring to Figures 1 and 4, the edge banding 4 is bonded to the foam material layer 1 and the protective layer 2 using adhesive. An injection groove 41 is provided on the side of the edge banding 4 facing the foam material layer 1 and the protective layer 2. Specifically, the injection groove 41 can be multiple grooves distributed on one side of the edge banding 4, each groove being evenly distributed on its surface to hold liquid adhesive.

[0060] In this solution, since the edge banding plate 4 has an injection groove 41 on one side, when connecting, the adhesive can be applied to the surface of the edge banding plate 4 and the injection groove 41 can be filled with adhesive. Then, the edge banding plate 4 is connected to the side of the foam material layer 1 and the protective layer 2. The edge banding plate 4 is gently squeezed so that the adhesive in the injection groove 41 seeps into the gap, thus avoiding connection failure due to insufficient adhesive application.

[0061] Referring to Figure 4, the top and bottom ends of the edge sealing plate 4 are provided with positioning protrusions 42 extending horizontally toward the protective layer 2. The side of the protective layer 2 is provided with positioning recesses 22 corresponding to the positions of the positioning protrusions 42. The positioning protrusions and positioning recesses 22 are matched and connected. The positioning part can extend in a roughly rectangular shape, and the positioning recess 22 is also a rectangular groove to facilitate positioning and connection.

[0062] In this solution, since the two ends of the edge sealing plate 4 are provided with positioning protrusions 42 and the corresponding side of the protective layer 2 is provided with positioning recesses 22, the edge sealing plate 4 can be quickly positioned by matching and connecting the positioning protrusions 42 and the positioning recesses 22, so as to facilitate connection, and at the same time play a limiting role in the vertical direction.

[0063] Referring to Figure 4, the positioning protrusion 42 has a horizontal positioning surface, a first engaging part 43 is provided on the horizontal positioning surface, and the positioning recess 22 has a second engaging part 23 corresponding to the position of the first engaging part 43. The first engaging part 43 and the second engaging part 23 are engaged in the vertical direction.

[0064] In this solution, the first snap-fit ​​part 43 and the second snap-fit ​​part 23 are snapped together in the vertical direction. Since the first snap-fit ​​part 43 is set on the horizontal positioning surface, it can limit the edge sealing plate 4 in the horizontal direction, so that the edge sealing plate 4 can be quickly positioned and snapped onto the side of the foam material layer 1 and the protective layer 2 for connection.

[0065] Optionally, the first snap-fit ​​portion 43 is a snap-fit ​​strip, and the second snap-fit ​​portion 23 is a snap-fit ​​groove. By snapping together with the snap-fit ​​strip and the snap-fit ​​groove, a longer interlocking length can be achieved along the edge of the buffer plate, allowing the edge sealing plate 4 to be accurately positioned to fit the sides of the foam material layer 1 and the protective layer 2 for connection. In other embodiments, the first snap-fit ​​portion 43 may also consist of multiple snap-fit ​​protrusions that match and snap into the snap-fit ​​groove.

[0066] This solution also discloses a battery pack that uses the aforementioned buffer plate for connecting the battery bottom protection plate. The buffer plate is connected between the bottom protection plate and the bottom tray of the battery, which can improve the battery pack's ability to resist impact and deformation, and also improve the waterproof capability of the bottom of the battery pack, thereby improving the safety of the battery pack during use.

[0067] The following examples and comparative examples provide further illustration:

[0068] Example 1

[0069] The single-layer continuous fiber reinforced resin composite material layer has a thickness of 0.15 mm and a glass fiber content of 70%. The protective layer consists of four layers of continuous fiber reinforced resin composite material, with a fiber angle of 90° between adjacent layers, using a 0° / 90° layup design. The protective layer thickness is 0.60 mm. The foamed board is made of PP material with a density of 100 kg / m3 and a thickness of 3.5 mm. The edge banding has the same structure as the protective layer. The overall thickness is 4.7 mm.

[0070] Example 2

[0071] The difference between this embodiment and Embodiment 1 is that the protective layer consists of two continuous fiber-reinforced resin composite material layers with a total thickness of 4.1 mm.

[0072] Example 3

[0073] The difference between this embodiment and Embodiment 1 is that the fiber angle between two adjacent continuous fiber reinforced resin composite material layers 21 is 45°.

[0074] Example 4

[0075] The difference between this embodiment and Embodiment 1 is that the fiber angle between two adjacent continuous fiber reinforced resin composite material layers 21 is 20°.

[0076] Comparative Example 1

[0077] The difference between this comparative example and Example 1 is that the fiber angle between two adjacent continuous fiber reinforced resin composite material layers 21 is 0°, that is, the fiber directions are arranged in parallel.

[0078] Comparative Example 2

[0079] The difference between this comparative example and Example 1 is that the buffer board is made of pure foam material, specifically PP material with a density of 100 kg / m3 and a thickness of 3.5 mm.

[0080] The experimental items include: water absorption rate, tensile strength, deformation after drop hammer impact, and bending strength test.

[0081] Water absorption test

[0082] I. Prepare samples from Examples 1 to 4, and Comparative Examples 1 and 2, weigh and record the initial weight M1 of each sample. II. Immerse each sample completely in water for a period of time until it no longer absorbs water. III. Remove each sample, gently wipe the surface moisture with absorbent paper, and then weigh it again to obtain the weight M2. IV. Calculate the water absorption rate: (M2 - M1) / M1.

[0083] Tensile strength tests were conducted according to standard GB / T1447-2005; drop hammer impact deformation tests were conducted according to standard ASTM D7136; and flexural strength tests were conducted according to standard GB / T1449-2005. The data obtained from the tests in each embodiment and comparative example are as follows:

[0084]

[0085] As can be seen from the table above, the buffer plates prepared in Examples 1 to 4 all have a water absorption rate of 0.1% or less, a tensile strength of 52 MPa or more, a deformation after drop hammer impact of 20 mm or less, and a bending strength of 20 MPa or more. All performance indicators are higher than those of Comparative Examples 1 and 2.

[0086] Compared with Example 2, Example 1 showed improved tensile and flexural strength, reduced deformation after drop hammer impact, and lower water absorption. This indicates that increasing the number of layers in the continuous fiber reinforced resin composite material has a better effect on improving structural strength and reducing water absorption.

[0087] Compared with Comparative Example 1, Examples 1, 3, and 4 show significantly improved tensile and flexural strengths, reduced deformation after drop hammer impact, and lower water absorption. This indicates that having a certain angle between the projections of the fiber length directions of adjacent layers onto the horizontal plane, compared to parallel arrangement, has a better effect on improving structural strength and reducing water absorption.

[0088] Compared with Comparative Example 2, Example 1 showed significantly improved tensile and flexural strength, significantly reduced deformation after drop hammer impact, and significantly lower water absorption. This indicates that adding a protective layer to the outside of the foamed material can greatly improve structural strength and reduce water absorption.

[0089] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A buffer plate for connection with a battery bottom protector, characterized in that: It includes a foam material layer (1) and a protective layer (2) respectively connected to the upper and lower surfaces of the foam material layer (1). The protective layer (2) includes multiple layers of continuous fiber reinforced resin composite material (21). The projections of the fiber length directions of two adjacent layers of continuous fiber reinforced resin composite material (21) onto the horizontal plane have an angle.

2. The buffer plate for connection with the battery bottom cover plate according to claim 1, characterized in that: The protective layer (2) includes an even number of continuous fiber reinforced resin composite material layers (21), each of the continuous fiber reinforced resin composite material layers (21) being symmetrically arranged along the middle surface of the protective layer (2); or the protective layer (2) includes an odd number of continuous fiber reinforced resin composite material layers (21), each of the continuous fiber reinforced resin composite material layers (21) being symmetrically arranged along the middle continuous fiber reinforced resin composite material layer (21).

3. The buffer plate for connection with the battery bottom cover plate according to claim 1, characterized in that: The included angle ranges from 20° to 90°.

4. The buffer plate for connection with the battery bottom cover plate according to claim 1, characterized in that: The sides of the foam material layer (1) and the protective layer (2) are also connected to a sealing plate (4).

5. The buffer plate for connection with the battery bottom cover plate according to claim 4, characterized in that: The edge banding (4) includes a continuous fiber reinforced resin composite material layer (21).

6. The buffer plate for connection with the battery bottom cover plate according to claim 4, characterized in that: The upper and lower ends of the sealing plate (4) are provided with positioning protrusions (42) extending horizontally toward the protective layer (2), and the side of the protective layer (2) is provided with positioning recesses (22) corresponding to the position of the positioning protrusions (42). The positioning protrusions (42) and the positioning recesses (22) are matched and connected.

7. The buffer plate for connection with the battery bottom cover plate according to claim 4, characterized in that: The foamed material layer (1) and the protective layer (2) are connected by heat fusion, and the edge sealing plate (4) is connected to the side of the foamed material layer (1) and the protective layer (2) by heat fusion.

8. The buffer plate for connection with the battery bottom protection plate according to claim 1, characterized in that: An adhesive layer (3) connects the foam material layer (1) and the protective layer (2).

9. The buffer plate for connection with the battery bottom cover plate according to claim 1, characterized in that: The thickness of the foamed material layer (1) is 2.0 mm to 10.0 mm, and the thickness of the protective layer (2) is 0.15 mm to 0.60 mm.

10. A battery pack, characterized in that: The buffer plate for connection with the battery bottom protection plate is as described in any one of claims 1-9.

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