Protective plate for battery pack, battery pack and vehicle

Abstract

The present application discloses a protective plate for a battery pack, a battery pack, and a vehicle. The protective plate includes a first fiber-resin composite layer, a metal layer, and a buffer layer, which are laminated in this order.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application bearing application number 202220240991.0 and title "Protective Plate for Battery Pack, Battery Pack and Vehicle" filed with the State Intellectual Property Office of the People's Republic of China on January 28, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of new energy technology, and more particularly to a protective plate for a battery pack, a battery pack and a vehicle. [Background technology]

[0003] As the demand for energy saving and environmental protection increases, electric vehicles in China have been developing rapidly in recent years. Unlike traditional gasoline vehicles, the traction battery is an important component of electric vehicles. The traction battery case is the carrier of the traction battery, so the demands for safety performance, dynamic performance and weight reduction of the traction battery case are also increasing.

[0004] Most of the conventional battery cases are made of metal materials. In order to reduce the weight of the vehicle body, the battery case is generally made of aluminum material. However, the hardness of aluminum is low, and when a stone or other protrusions picked up by a new energy vehicle while running strike the bottom of the battery pack, the battery case is likely to be damaged and cannot better protect the battery pack, so that the function of the battery pack may be lost, and even the risk of fire, explosion, etc. may occur. Therefore, a protective plate is generally provided at the bottom of the battery pack to improve the safety performance of the battery pack.

[0005] In the prior art, protective plates are generally made of metal materials such as steel and aluminum, but protective plates made of metal materials are difficult to treat for preservation and are prone to surface corrosion, making it difficult to meet current usage needs. Summary of the Invention [Means for solving the problem]

[0006] One object of the present application is to provide a protective plate for a battery pack, a battery pack, and a vehicle.

[0007] A first aspect of the present invention provides a protective plate for a battery pack, which includes a first fiber-resin composite layer, a metal layer, and a buffer layer, which are laminated in order.

[0008] In some embodiments, the faceplate further comprises a second fiber-resin composite layer disposed on a side of the buffer layer away from the metal layer.

[0009] In some embodiments, the first fiber-resin composite layer has a thickness of 0.3 mm to 1.0 mm, the metal layer has a thickness of 0.6 mm to 1.2 mm, the buffer layer has a thickness of 6 mm to 12 mm, and the second fiber-resin composite layer has a thickness of 0.5 mm to 1.0 mm.

[0010] In some embodiments, the protective plate has a thickness of 7 to 15 mm.

[0011] In some embodiments, a first adhesive layer is provided between the first fiber-resin composite layer and the metal layer, and the first adhesive layer has a thickness of 0.1 mm to 0.3 mm.

[0012] In some embodiments, a second adhesive layer is provided between the metal layer and the buffer layer, and the second adhesive layer has a thickness of 0.1 mm to 0.3 mm.

[0013] In some embodiments, a third adhesive layer is provided between the cushioning layer and the second fiber-resin composite layer, the third adhesive layer having a thickness of 0.1 mm to 0.3 mm.

[0014] In some embodiments, the buffer layer and the metal layer are connected via a molten portion, a connection hole is formed in the metal layer, one end of the molten portion is located within the connection hole and is connected to the inner wall of the connection hole, and the other end of the molten portion is connected to the buffer layer.

[0015] In some embodiments, the buffer layer has a groove on a side facing the metal layer, the metal layer being located within the groove.

[0016] In some embodiments, the metal layer has a first dimension in the longitudinal direction of the protective plate, the first fiber-resin composite layer has a second dimension in the longitudinal direction of the protective plate, the buffer layer has a third dimension in the longitudinal direction of the protective plate, the first dimension being smaller than the second dimension and the first dimension being smaller than the third dimension, and / or the metal layer has a fourth dimension in the width direction of the protective plate, the first fiber-resin composite layer has a fifth dimension in the width direction of the protective plate, the buffer layer has a sixth dimension in the width direction of the protective plate, the fourth dimension being smaller than the fifth dimension and the fourth dimension being smaller than the sixth dimension.

[0017] In some embodiments, the protective plate further includes a second fiber-resin composite layer on the side of the buffer layer away from the metal layer, the second fiber-resin composite layer having a seventh dimension in the longitudinal direction of the protective plate, the seventh dimension being equal to the second dimension, and / or the second fiber-resin composite layer having an eighth dimension in the width direction of the protective plate, the fifth dimension being equal to the eighth dimension.

[0018] In some embodiments, the second dimension is greater than or equal to the third dimension and / or the fifth dimension is greater than or equal to the sixth dimension.

[0019] In some embodiments, the protective plate has a length dimension of L mm, a first distance in the longitudinal direction of the protective plate between an edge of the metal layer and an edge of the first fiber-resin composite layer, the dimension of the first distance being L*(3% to 8%) mm, and a second distance between the edge of the metal layer and the edge of the buffer layer, the dimension of the second distance being L*(3% to 8%) mm.

[0020] In some embodiments, the width dimension of the protective plate is W mm, there is a third distance in the width direction of the protective plate between an edge of the metal layer and an edge of the first fiber-resin composite layer, the dimension of the third distance being W*(2% to 12%) mm, and there is a fourth distance between the edge of the metal layer and the edge of the buffer layer, the dimension of the fourth distance being W*(2% to 12%) mm.

[0021] In some embodiments, the first fiber-resin composite layer includes fibers and a resin, the fibers being at least one of carbon fibers, glass fibers, and aramid fibers, and the resin being at least one of epoxy resin, phenolic resin, polypropylene resin, and nylon resin.

[0022] In some embodiments, the buffer layer has a honeycomb structure, the pore size of the honeycomb structure is between 6 mm and 10 mm, the pore wall size of the honeycomb structure is between 0.3 mm and 0.8 mm, or the buffer layer has a foam structure.

[0023] A second aspect of the present invention provides a battery pack, the battery pack including a tray and the protective plate according to the first aspect, the protective plate being attached to the tray.

[0024] A third aspect of the present invention provides a vehicle, the vehicle including the battery pack according to the second aspect. Effect of the Invention

[0025] The present application has the following technical effects: The protective plate of the present application includes a first fiber-resin composite layer, a metal layer, and a buffer layer, which are laminated in order, and the metal layer is located between the first fiber-resin composite layer and the buffer layer, thereby preventing the phenomenon of the metal layer of the protective plate being corroded.

[0026] The first fiber-resin composite layer and the metal layer of the protective plate of the present application are laminated, and the plastic deformation ability of the metal layer can effectively compensate for the brittle fracture of the first fiber-resin composite layer itself, greatly improving the resistance ability of the protective plate to external impacts, and the buffer layer has good buffering and energy absorption effects, so that the protective plate of the present application has both impact resistance and structural rigidity, and extends the service life of the protective plate.

[0027] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application, taken in conjunction with the accompanying drawings.

[0028] The drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the specification, serve to explain the principles of the present application. [Brief description of the drawings]

[0029] [Figure 1] 1 is a schematic diagram of a battery pack according to the present application; [Diagram 2] 1 is a schematic diagram of a battery tray and a protective plate according to the present application. [Diagram 3] 1 is a schematic configuration diagram 1 of a protection plate according to the present application. [Figure 4] FIG. 2 is a schematic configuration diagram 2 of the protection plate according to the present application. [Diagram 5] FIG. 3 is a schematic configuration diagram 3 of a protection plate according to the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Various exemplary embodiments of the present application will be described in detail below with reference to the drawings. Please note that unless otherwise specifically stated, the relative arrangement of parts and steps, formulas and numerical values ​​described in these embodiments do not limit the scope of the present application.

[0031] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the present application and its application or uses.

[0032] Techniques and devices known to those skilled in the art are not discussed in detail, but where appropriate, said techniques and devices should be considered part of the specification.

[0033] In all examples shown and discussed herein, any specific values ​​should be construed as exemplary only and not limiting, and thus other examples of the example embodiments may have different values.

[0034] It should be noted that similar symbols and letters represent similar things in the following drawings, so that once something is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0035] The present application provides a protective plate 1 for a battery pack. As shown in Figures 1 to 5, the protective plate 1 includes a first fiber-resin composite layer 11, a metal layer 12, and a buffer layer 13, which are laminated in this order.

[0036] In the embodiment of the present disclosure, the protective plate 1 includes a first fiber-resin composite layer 11, a metal layer 12, and a buffer layer 13, and the metal layer 12 is located between the first fiber-resin composite layer 11 and the buffer layer 13. The first fiber-resin composite layer 11 is a sheet structure obtained by combining a fiber material and a resin material, and the first fiber-resin composite layer 11 is used as the surface material of the protective plate 1, that is, the first fiber-resin composite layer 11 is the outermost layer of the protective plate 1. The first fiber-resin composite layer 11 of the present application has excellent corrosion resistance and can improve the scratch resistance and impact resistance of the surface of the metal layer 12. The first fiber-resin composite layer 11 of the present application is a composite of a fiber material and a resin composite material, and ensures the strength and rigidity of the protective plate 1.

[0037] In the embodiment of the present disclosure, the first fiber-resin composite layer 11 and the metal layer 12 are laminated. For example, the first fiber-resin composite layer 11 and the metal layer 12 may be laminated directly, or may be laminated through a medium material. Hereinafter, for example, a case where the first fiber-resin composite layer 11 and the metal layer 12 are laminated through a first adhesive layer 15 will be described. The first adhesive layer 15 is a medium material. In the embodiment of the present application, the plastic deformation ability of the metal layer 12 can effectively compensate for the brittle fracture of the first fiber-resin composite layer 11 itself, and greatly improve the resistance ability of the protective plate 1 against external impact. In addition, the first fiber-resin composite layer 11 is provided on one surface of the metal layer 12, thereby avoiding the phenomenon that the metal layer 12 is easily corroded. For example, the material of the metal layer 12 may be steel, aluminum, titanium alloy, etc. In some embodiments, the metal layer 12 is a steel plate.

[0038] In the embodiment of the present disclosure, the buffer layer 13 and the metal layer 12 are laminated, for example, the buffer layer 13 and the metal layer 12 may be laminated directly or through a medium material. Hereinafter, for example, the case where the buffer layer 13 and the metal layer 12 are laminated through the second adhesive layer 16 will be described. The second adhesive layer 16 is a medium material. When the protective plate 1 is hit during use, the buffer layer 13 has good buffering ability, so that it absorbs the acting force when the protective plate is hit, and thus the protective plate 1 has good buffering and energy absorbing properties. Specifically, the rigidity of the buffer layer 13 is smaller than the rigidity of the metal layer 12, that is, when the metal layer 12 and the buffer layer 13 are impacted with the same force, the deformation amount of the metal layer 12 is smaller, so that the metal layer 12 has a greater structural strength, which can prevent the overall deformation caused by the excessive deformation amount of the bottom of the protective plate 1, and improve the structural stability of the protective plate 1. The buffer layer 13 has low rigidity and can further absorb the impact energy transmitted from the metal layer 12 by its own deformation, suppress the transmission speed of the impact energy, and reduce the amount of impact received by the protective plate 1. After the protective plate 1 receives an impact, it can ensure the stability of the entire structure, effectively absorb the impact energy, improve the structural stability of the protective plate 1, and extend the service life of the protective plate 1. In addition, the buffer layer 13 is provided on the other surface of the metal layer 12, thereby avoiding the phenomenon that the surface of the metal layer 12 is easily corroded.

[0039] In one embodiment, as shown in FIGS. 1 to 5, the protective plate 1 further includes a second fiber-resin composite layer 14 provided on the side of the buffer layer 13 remote from the metal layer 12.

[0040] In the embodiment of the present disclosure, the second fiber-resin composite layer 14 is provided on the buffer layer 13, on the opposite side to the metal layer 12. For example, the protective plate 1 includes a first fiber-resin composite layer 11, a metal layer 12, a buffer layer 13, and a second fiber-resin composite layer 14, which are laminated in this order. In the present application, the structural rigidity of the protective plate 1 is further improved by separately providing the second fiber-resin composite layer 14.

[0041] In one embodiment, both the first fiber-resin composite layer 11 and the second fiber-resin composite layer 14 include a fiber material and a resin material, the weight percentage of the fiber material is in the range of 50%-60% of the fiber-resin composite layer, and the weight percentage of the resin material is in the range of 35%-50% of the fiber-resin composite layer. In this embodiment, the fiber material and the resin material in the first fiber-resin composite layer 11 and the second fiber-resin composite layer 14 are limited so that both the first fiber-resin composite layer 11 and the second fiber-resin composite layer 14 have characteristics such as light weight, crash resistance, and impact resistance.

[0042] In one embodiment, as shown in Figures 1 to 5, the first fiber-resin composite layer 11 has a thickness of 0.3 mm to 1.0 mm, the metal layer 12 has a thickness of 0.6 mm to 1.2 mm, the buffer layer 13 has a thickness of 6 mm to 12 mm, and the second fiber-resin composite layer 14 has a thickness of 0.5 mm to 1.0 mm.

[0043] In this embodiment, the thicknesses of the first fiber-resin composite layer 11, the metal layer 12, the buffer layer 13 and the second fiber-resin composite layer 14 are limited, and the thickness of the protective plate 1 is reduced as much as possible on the premise that the requirements for the structural strength, rigidity and impact resistance of the protective plate 1 are satisfied, thereby improving the weight reduction effect. The protective plate 1 is applied to the battery pack 2, thereby reducing the height space of the entire battery pack 2.

[0044] In the prior art, the protective plate is a metal protective plate, and a coating is provided on the surface of the metal protective plate to prevent the metal protective plate from being corroded, and the thickness of the coating formed on the metal surface is generally 1.5 to 3.0 mm. In this embodiment, the first fiber-resin composite layer 11 is provided on one surface of the metal layer 12, and the thickness of the first fiber-resin composite layer 11 is 0.3 mm to 1.0 mm, thereby realizing a further lightweight design and reducing the overall thickness of the protective plate 1. For example, the thickness of the first fiber-resin composite layer 11 is 0.3 mm, 0.5 mm, 0.8 mm, or 1.0 mm.

[0045] In this embodiment, the thickness of the metal layer 12 is limited and reduced as much as possible on the premise of satisfying the structural strength and rigidity of the protective plate 1. For example, the thickness of the metal layer 12 is 0.6 mm, 0.8 mm, 1 mm, or 1.2 mm.

[0046] In this embodiment, the thickness of the buffer layer 13 is limited and reduced as much as possible under the premise of satisfying the buffer performance of the protective plate 1. For example, the thickness of the buffer layer 13 is 6 mm, 8 mm, 10 mm, and 12 mm.

[0047] In one embodiment, the thickness of the protection plate 1 is 7 to 15 mm.

[0048] In this embodiment, the overall thickness of the protective plate 1 is limited, and on the premise of meeting the requirement of lightweight installation of the protective plate, the rigidity and strength of the protective plate 1 is ensured, and the phenomenon that the protective plate 1 is easily bent when subjected to a collision or impact is avoided.

[0049] In one embodiment, as shown in Figures 3 to 5, a first adhesive layer 15 is provided between the first fiber-resin composite layer 11 and the metal layer 12, and the thickness of the first adhesive layer 15 is 0.1 mm to 0.3 mm.

[0050] In one embodiment, a second adhesive layer 16 is provided between the metal layer 12 and the buffer layer 13, and the second adhesive layer 16 has a thickness of 0.1 mm to 0.3 mm.

[0051] In a specific embodiment, as shown in Fig. 3, adjacent layers in the first fiber-resin composite layer 11, the metal layer 12 and the buffer layer 13 are bonded by an adhesive layer to form the protective plate 1. For example, a first adhesive layer 15 is provided between the first fiber-resin composite layer 11 and the metal layer 12, and the first fiber-resin composite layer 11 and the metal layer 12 are bonded by the first adhesive layer 15. A second adhesive layer 16 is provided between the metal layer 12 and the buffer layer 13, and the metal layer 12 and the buffer layer 13 are bonded by the second adhesive layer 16. The first adhesive layer 15 and the second adhesive layer 16 may be the same type of adhesive layer or different types of adhesive layers. For example, the first adhesive layer 15 is a hot melt adhesive film, and the first fiber-resin composite layer 11 and the metal layer 12 are bonded together by melting the hot melt adhesive film using a heating and pressurizing device, or the first adhesive layer 15 is a spray adhesive layer, and the first fiber-resin composite layer 11 and the metal layer 12 are directly bonded together by the spray adhesive layer. The second adhesive layer 16 is a hot melt adhesive film, and the buffer layer 13 and the metal layer 12 are bonded together by melting the hot melt adhesive film using a heating and pressurizing device, or the second adhesive layer 16 is a spray adhesive layer, and the buffer layer 13 and the metal layer 12 are directly bonded together by the spray adhesive layer.

[0052] In order to prevent the thickness of the protective plate 1 from becoming too thick, the thicknesses of the first adhesive layer 15 and the second adhesive layer 16 are limited, and the thicknesses of the first adhesive layer 15 and the second adhesive layer 16 may be the same or different. The thickness of the first adhesive layer 15 is 0.1 mm to 0.3 mm, and preferably 0.15 mm to 0.2 mm. The thickness of the second adhesive layer 16 is 0.1 mm to 0.3 mm, and preferably 0.15 mm to 0.2 mm.

[0053] In the embodiment of the present disclosure, the connection method of the first fiber-resin composite layer 11, the metal layer 12 and the buffer layer 13 is limited to improve the connection reliability between adjacent layers and prevent the protective plate 1 from cracking during use.

[0054] In one embodiment, a third adhesive layer is provided between the buffer layer 13 and the second fiber-resin composite layer 14, and the thickness of the third adhesive layer is 0.1 mm to 0.3 mm.

[0055] In the embodiment of the present disclosure, the buffer layer 13 and the second fiber-resin composite layer 14 are bonded by a third adhesive layer (not shown). For example, the third adhesive layer is a hot melt adhesive film, and the second fiber-resin composite layer 14 and the buffer layer are bonded by melting the hot melt adhesive film using a heating and pressing device, or the third adhesive layer is a spray adhesive layer, and the second fiber-resin composite layer 14 and the buffer layer 13 are directly bonded by the spray adhesive layer. The thickness of the third adhesive layer is 0.1 mm to 0.3 mm, and preferably 0.15 mm to 0.2 mm.

[0056] In one embodiment, as shown in Figure 4, the buffer layer 13 and the metal layer 12 are connected via a molten portion, a connection hole 20 is formed in the metal layer 12, one end of the molten portion is located within the connection hole 20 and connected to the inner wall of the connection hole 20, and the other end of the molten portion is connected to the buffer layer 13; alternatively, a groove 17 is provided on the side of the buffer layer 13 facing the metal layer 12, and the metal layer 12 is located within the groove 17.

[0057] 3, the first fiber-resin composite layer 11 and the metal layer 12 are connected via a first adhesive layer 15. For example, the first adhesive layer 15 is a hot melt adhesive film, and the first fiber-resin composite layer 11 and the metal layer 12 are bonded together by melting the hot melt adhesive film using a heating and pressurizing device. Alternatively, the first fiber-resin composite layer 11 and the metal layer 12 are bonded together by a spray adhesive layer.

[0058] 4, the metal layer 12 and the buffer layer 13 are not connected by an adhesive layer, but one or more molten parts are provided between the metal layer 12 and the buffer layer 13, and the metal layer 12 and the buffer layer 13 are connected through the molten parts. For example, the molten parts may be distributed in the circumferential direction of the metal layer 12 and the buffer layer 13, or the molten parts may be distributed diagonally between the metal layer 12 and the buffer layer 13, or the molten parts may be distributed in an array between the metal layer 12 and the buffer layer 13. In this embodiment, the position limiting posts 18 provided on the metal layer 12 and the buffer layer 13 are brought into a molten state by a hot press method to form the molten parts.

[0059] Specifically, a position limiting post 18 is provided in the buffer layer 13, a connection hole 20 is provided in the metal layer 12 to be aligned with the position limiting post 18, and the position limiting post 18 is fitted into the connection hole 20; that is, one end of the position limiting post 18 is fixed to the buffer layer 13, and the other end of the position limiting post 18 is fixed to the metal layer 12 via the connection hole 20, and the position limiting post 18 is melted by a hot press method to form a molten part. The metal layer 12 and the buffer layer 13 are connected to each other via a molten part (i.e., the position limiting post 18 in a molten state), and one end of the molten part is connected to the connection hole 20, so that one end of the molten part is fixed to the metal layer 12 and the other end of the molten part is fixed to the buffer layer 13, thereby improving the connection strength between the metal layer 12 and the buffer layer 13. For example, the position limiting post 18 is a plastic post. For example, the buffer layer 13 has a honeycomb structure, and one end of the position limiting post 18 is fixed in a hole of the honeycomb structure as shown in FIG. 4.

[0060] In another specific embodiment, as shown in FIG. 5, a first adhesive layer 15 is provided between the first fiber-resin composite layer 11 and the metal layer 12, and the first fiber-resin composite layer 11 and the metal layer 12 are bonded by the first adhesive layer 15. A second adhesive layer 16 is provided between the metal layer 12 and the buffer layer 13, and the metal layer 12 and the buffer layer 13 are bonded by the second adhesive layer 16. In this embodiment, in order to further improve the connection strength between the metal layer 12 and the buffer layer 13, a groove 17 is provided in the buffer layer 13, and the metal layer 12 is located in the groove 17. When the metal layer 12 is fitted into the groove 17, the metal layer 12 and the buffer layer 13 are first preliminarily fixed by the groove 17, and after the preliminarily fixed, the second adhesive layer 16 provided between the metal layer 12 and the buffer layer 13 is melted by a heating and pressing device to bond the metal layer 12 and the buffer layer 13, thereby further improving the connection strength between the metal layer 12 and the buffer layer 13.

[0061] In one embodiment, as shown in Figures 3 to 5, the metal layer 12 has a first dimension in the longitudinal direction of the protective plate 1, the first fiber-resin composite layer 11 has a second dimension in the longitudinal direction of the protective plate 1, the buffer layer 13 has a third dimension in the longitudinal direction of the protective plate 1, the first dimension being smaller than the second dimension and the first dimension being smaller than the third dimension, and / or the metal layer 12 has a fourth dimension in the width direction of the protective plate 1, the first fiber-resin composite layer 11 has a fifth dimension in the width direction of the protective plate 1, the buffer layer 13 has a sixth dimension in the width direction of the protective plate 1, the fourth dimension being smaller than the fifth dimension and the fourth dimension being smaller than the sixth dimension.

[0062] In this embodiment, the metal layer 12 is located between the first fiber-resin composite layer 11 and the buffer layer 13, limiting the length and width dimensions of the metal layer 12 and preventing the metal layer 12 from being corroded.

[0063] Specifically, in the longitudinal direction of the protective plate 1 (see the direction of arrow a in Figure 3), the length dimension of the metal layer 12 is smaller than the length dimension of the first fiber resin composite layer 11, and the length dimension of the metal layer 12 is smaller than the length dimension of the buffer layer 13.

[0064] In the width direction of the protective plate 1 (see the direction of arrow b shown in Figure 3), the width dimension of the metal layer 12 is smaller than the width dimension of the first fiber resin composite layer 11, and the width dimension of the metal layer 12 is smaller than the width dimension of the buffer layer 13, i.e., the surface area of ​​the metal layer 12 is smaller than the surface area of ​​the first fiber resin composite layer 11, and the area of ​​the metal layer 12 is smaller than the surface area of ​​the buffer layer 13.

[0065] Since the surface area of ​​the metal layer 12 is smaller than that of the first fiber-resin composite layer 11, and the area of ​​the metal layer 12 is smaller than the surface area of ​​the buffer layer 13, during the molding of the protective plate 1, a part of the first fiber-resin composite layer 11 is laminated onto the metal layer 12, and another part of the first fiber-resin composite layer 11 is laminated onto the buffer layer 13, so that the metal layer 12 is positioned between the first fiber-resin composite layer 11 and the buffer layer 13, thereby preventing the surface of the metal layer 12 from being corroded.

[0066] In one embodiment, the second fiber-resin composite layer 14 has a seventh dimension in the longitudinal direction of the protective plate 1, the seventh dimension being equal to the second dimension, and / or the second fiber-resin composite layer 14 has an eighth dimension in the width direction of the protective plate 1, the fifth dimension being equal to the eighth dimension.

[0067] In an embodiment of the present disclosure, when the length dimension of the buffer layer 13 is smaller than the length dimension of the first fiber resin composite layer 11, the width dimension of the buffer layer 13 is smaller than the width dimension of the first fiber resin composite layer 11, and at the same time, the length dimension of the second fiber resin composite layer 14 is equal to the length dimension of the first fiber resin composite layer 11, and the width dimension of the second fiber resin composite layer 14 is equal to the width dimension of the first fiber resin composite layer 11, a part of the first fiber resin composite layer 11 is laminated onto the metal layer 12, and another part of the first fiber resin composite layer 11 is laminated onto the second fiber resin composite layer 14, thereby enveloping the metal layer 12 and avoiding the phenomenon of the metal layer 12 being corroded.

[0068] Furthermore, the second dimension is greater than or equal to the third dimension and / or the fifth dimension is greater than or equal to the sixth dimension.

[0069] In this embodiment, the relationship between the length dimension of the first fiber-resin composite layer 11 and the length dimension of the buffer layer 13 is limited, and the relationship between the width dimension of the first fiber-resin composite layer 11 and the width dimension of the buffer layer 13 is limited. By limiting the length and width dimensions of both, none of the surfaces of the metal layer 12 are exposed to the outside and are not corroded.

[0070] When the second fiber-resin composite layer 14 is not included, preferably, the length dimension of the first fiber-resin composite layer 11 is equal to the length dimension of the buffer layer 13, and at the same time, the width dimension of the first fiber-resin composite layer 11 is equal to the width dimension of the buffer layer 13, in which case a portion of the first fiber-resin composite layer 11 is laminated to the metal layer 12, and another portion of the first fiber-resin composite layer 11 is laminated to the buffer layer 13.

[0071] When the second fiber resin composite layer 14 is included, the length dimension of the first fiber resin composite layer 11 is greater than the length dimension of the buffer layer 13, and the width dimension of the first fiber resin composite layer 11 is greater than the width dimension of the buffer layer 13; at the same time, the length dimension of the first fiber resin composite layer 11 and the length dimension of the second fiber resin composite layer 14 are equal, and the width dimension of the first fiber resin composite layer 11 and the width dimension of the second fiber resin composite layer 14 are equal. In this case, a portion of the first fiber resin composite layer 11 is laminated to the metal layer 12, and another portion of the first fiber resin composite layer 11 is laminated to the second fiber resin composite layer 14.

[0072] In one embodiment, the length dimension of the protective plate 1 is L mm, and in the longitudinal direction of the protective plate 1, there is a first distance between the edge of the metal layer 12 and the edge of the first fiber resin composite layer 11, the dimension of the first distance being L*(3% to 8%) mm, and there is a second distance between the edge of the metal layer 12 and the edge of the buffer layer 13, the dimension of the second distance being L*(3% to 8%) mm.

[0073] The width dimension of the protective plate 1 is W mm, and in the width direction of the protective plate 1, there is a third distance between the edge of the metal layer 12 and the edge of the first fiber resin composite layer 11, the dimension of the third distance being W*(2% to 12%) mm, and there is a fourth distance between the edge of the metal layer 12 and the edge of the buffer layer 13, the dimension of the fourth distance being W*(2% to 12%) mm.

[0074] In this embodiment, in the longitudinal direction of the protective plate 1, the metal layer 12 has a first edge and a second edge, the first fiber resin composite layer 11 has a third edge and a fourth edge, the first edge and the third edge are located on the same side, the second edge and the fourth edge are located on the same side, there is a first distance between the first edge of the metal layer 12 and the third edge of the first fiber resin composite layer 11, the dimension of the first distance is L*(3% to 8%) mm, or there is also a first distance between the second edge of the metal layer 12 and the fourth edge of the first fiber resin composite layer 11, the dimension of the first distance is L*(3% to 8%) mm.

[0075] Similarly, in the longitudinal direction of the protective plate 1, the buffer layer 13 has a fifth edge and a sixth edge, the first edge and the fifth edge are located on the same side, the second edge and the sixth edge are located on the same side, there is a second distance between the first edge and the fifth edge, and there is a second distance between the second edge and the sixth edge.

[0076] In this embodiment, the length dimension of the metal layer 12 is smaller than the length dimension of the first fiber-resin composite layer 11 , and the length dimension of the metal layer 12 is smaller than the length dimension of the buffer layer 13 . In this embodiment, there is a first distance between the edge of the metal layer 12 and the edge of the first fiber resin composite layer 11, and the dimension of the first distance is limited to L*(3% to 8%) mm, and there is a second distance between the edge of the metal layer 12 and the edge of the buffer layer 13, and the dimension of the second distance is limited to L*(3% to 8%) mm. By doing so, the metal layer 12 is located between the first fiber resin composite layer 11 and the buffer layer 13, and the surface of the metal layer 12 provided along the longitudinal direction of the protective plate 1 is prevented from being corroded. On the other hand, since the length dimension of the metal layer 12 is smaller than the length dimension of the first fiber resin composite layer 11 and the length dimension of the metal layer 12 is smaller than the length dimension of the buffer layer 13, the metal layer 12 is not provided in the longitudinal edge region of the protective plate 1. In this embodiment, by limiting the first distance and the second distance to within this range, the structural strength of the edge region of the protective plate 1 is improved.

[0077] In this embodiment, in the width direction of the protective plate 1, the metal layer 12 has a seventh edge and an eighth edge, the first fiber-resin composite layer 11 has a ninth edge and a tenth edge, the seventh edge and the ninth edge are located on the same side, the eighth edge and the tenth edge are located on the same side, there is a third distance between the seventh edge and the ninth edge, and there is a third distance between the eighth edge and the tenth edge.

[0078] Similarly, in the width direction of the protective plate 1, the buffer layer 13 has an 11th edge and a 12th edge, the seventh edge and the 11th edge are located on the same side, the eighth edge and the 12th edge are located on the same side, there is a fourth distance between the seventh edge and the 11th edge, and there is a fourth distance between the eighth edge and the 12th edge.

[0079] In this embodiment, the width dimension of the metal layer 12 is smaller than the width dimension of the first fiber-resin composite layer 11, and the width dimension of the metal layer 12 is smaller than the width dimension of the buffer layer 13. In this embodiment, there is a third distance between the edge of the metal layer 12 and the edge of the first fiber-resin composite layer 11, and the dimension of the third distance is limited to W*(2% to 12%) mm, and there is a fourth distance between the edge of the metal layer 12 and the edge of the buffer layer 13, and the dimension of the fourth distance is limited to W*(2% to 12%) mm. By this, the metal layer 12 is located between the first fiber-resin composite layer 11 and the buffer layer 13, and the surface of the metal layer 12 provided along the width direction of the protective plate 1 is prevented from being corroded, while the metal layer 12 is not provided in the edge region in the width direction of the protective plate 1, and in this embodiment, the third distance and the fourth distance are limited within this range, thereby improving the structural strength of the edge region of the protective plate 1.

[0080] For example, the first distance dimension may be L*(3%~5%)mm, L*(5%~8%)mm, the second distance dimension may be L*(3%~5%)mm, L*(5%~8%)mm, the third distance dimension may be W*(2%~10%)mm, W*(3%~12%)mm, and the fourth distance dimension may be W*(2%~10%)mm, W*(3%~12%)mm.

[0081] In one embodiment, the first fiber-resin composite layer 11 includes fibers and resin, the fibers being at least one of carbon fibers, glass fibers, and aramid fibers, and the resin being at least one of epoxy resin, phenolic resin, polypropylene resin, and nylon resin.

[0082] In this embodiment, the type of fiber and the type of resin of the first fiber-resin composite layer 11 are limited to improve the structural strength of the protective plate 1. For example, the first fiber-resin composite layer 11 may be made of glass fiber and epoxy resin.

[0083] In one embodiment, the buffer layer 13 has a honeycomb structure 19, the pore size of the honeycomb structure 19 is 6mm-10mm, and the pore wall size of the honeycomb structure 19 is 0.3mm-0.8mm, or the buffer layer 13 has a foam structure.

[0084] In this embodiment, by limiting the honeycomb structure 19 in the buffer layer, specifically, by limiting the space dimension and pore wall dimension of the honeycomb structure, the buffer layer 13 can have better buffering and energy absorbing functions.

[0085] In addition, aluminum may be used as the material for the buffer layer 13 and a honeycomb structure may be formed on an aluminum plate, or polypropylene may be used as the material for the buffer layer 13 and a honeycomb structure may be formed on a polypropylene plate (PP plate), thereby improving the impact resistance of the protective plate 1 and increasing the rigidity of the entire protective plate 1.

[0086] In one preferred embodiment, the cushioning layer 13 may have a foam structure to provide cushioning and energy absorption.

[0087] A second aspect of the present invention provides a battery pack 2. The battery pack 2 includes a tray 21 and the protective plate according to the first aspect, and the protective plate 1 is attached to the tray 21.

[0088] In this embodiment, a battery pack 2 is provided. The battery pack 2 includes a protective plate 1 of the present application, and the protective plate 1 is attached to a tray 21 of the battery pack 2, and the protective plate 1 serves to protect the battery pack 2 and improve the safety of the battery pack 2. As shown in Fig. 1, the battery pack 2 is composed of a seal cover 23, a cell 22, a tray 21, and the protective plate 1, and a storage space for storing the cell 22 is formed by being surrounded by the seal cover 23 and the tray 21, and the protective plate 1 is provided outside the tray 21 and connected to the bottom of the tray 21.

[0089] A third aspect of the present invention provides a vehicle, the vehicle including the battery pack 2 according to the second aspect.

[0090] In this embodiment, a vehicle is provided, which includes the battery pack 2 and a load connected to the battery pack. The load includes, but is not limited to, an inverter, an air conditioner compressor, etc. The battery pack 2 is applied to the vehicle, which ensures the safety of the battery pack 2 and further improves the safety during driving of the vehicle.

[0091] In the above embodiments, the differences between the embodiments are described with emphasis, and the different optimal features between the embodiments can be combined to form a more preferred embodiment, unless they are contradictory, and for the sake of brevity, the description will be omitted here.

[0092] Although some specific embodiments of the present application have been described in detail with reference to examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is limited by the appended claims. [Explanation of symbols]

[0093] 1 Protective plate 11 First fiber-resin composite layer 12 metal layer 13 Buffer layer 14 Second fiber-resin composite layer 15 First adhesive layer 16 Second adhesive layer 17 Groove 18 Position Restriction Post 19 Honeycomb structure 20 Connection hole 2 Battery pack 21 Tray 22 Cells 23 Seal cover

Claims

1. A protective plate (1) for a battery pack (2), comprising a first fiber-resin composite layer (11), a metal layer (12) and a buffer layer (13), which are laminated in this order.

2. 2. The protective plate (1) according to claim 1, further comprising a second fiber-resin composite layer (14) provided on the side of the buffer layer (13) facing away from the metal layer (12).

3. The protective plate (1) according to claim 2, characterized in that the first fiber-resin composite layer (11) has a thickness of 0.3 mm to 1.0 mm, the metal layer (12) has a thickness of 0.6 mm to 1.2 mm, the buffer layer (13) has a thickness of 6 mm to 12 mm, and the second fiber-resin composite layer (14) has a thickness of 0.5 mm to 1.0 mm.

4. The protective plate (1) according to claim 1, characterized in that the thickness of the protective plate (1) is between 7 and 15 mm.

5. The protective plate (1) according to claim 1, characterized in that a first adhesive layer (15) is provided between the first fiber-resin composite layer (11) and the metal layer (12), the first adhesive layer (15) having a thickness of 0.1 mm to 0.3 mm, and / or a second adhesive layer (16) is provided between the metal layer (12) and the buffer layer (13), the second adhesive layer (16) having a thickness of 0.1 mm to 0.3 mm.

6. The protective plate (1) according to claim 2, characterized in that a third adhesive layer is provided between the buffer layer (13) and the second fiber-resin composite layer (14), and the thickness of the third adhesive layer is 0.1 mm to 0.3 mm.

7. The buffer layer (13) and the metal layer (12) are connected via a molten portion, a connection hole (20) is formed in the metal layer (12), one end of the molten portion is located within the connection hole (20) and is connected to the inner wall of the connection hole (20), and the other end of the molten portion is connected to the buffer layer (13), or 2. The protective plate (1) according to claim 1, characterized in that a groove (17) is provided on the side of the buffer layer (13) facing the metal layer (12), and the metal layer (12) is located within the groove (17).

8. the metal layer (12) has a first dimension in the longitudinal direction of the protective plate (1), the first fiber-resin composite layer (11) has a second dimension in the longitudinal direction of the protective plate (1), the buffer layer (13) has a third dimension in the longitudinal direction of the protective plate (1), the first dimension being smaller than the second dimension, the first dimension being smaller than the third dimension, and / or The protective plate (1) of claim 1, characterized in that the metal layer (12) has a fourth dimension in the width direction of the protective plate (1), the first fiber-resin composite layer (11) has a fifth dimension in the width direction of the protective plate (1), and the buffer layer (13) has a sixth dimension in the width direction of the protective plate (1), the fourth dimension being smaller than the fifth dimension and the fourth dimension being smaller than the sixth dimension.

9. 9. The protective plate (1) according to claim 8, characterized in that the second dimension is greater than or equal to the third dimension and / or the fifth dimension is greater than or equal to the sixth dimension.

10. The protective plate (1) further comprises a second fiber-resin composite layer (14) provided on the side of the buffer layer (13) facing away from the metal layer (12), the second fiber-resin composite layer (14) having a seventh dimension in the longitudinal direction of the protective plate (1), the seventh dimension being equal to the second dimension, and / or the second fiber-resin composite layer (14) having an eighth dimension in the width direction of the protective plate (1), the fifth dimension being equal to the eighth dimension.

11. The length dimension of the protective plate (1) is L mm, in the longitudinal direction of the protective plate (1), there is a first distance between an edge of the metal layer (12) and an edge of the first fiber-resin composite layer (11), the dimension of the first distance being L*(3% to 8%) mm, there is a second distance between the edge of the metal layer (12) and the edge of the buffer layer (13), the dimension of the second distance being L*(3% to 8%) mm, and / or The protective plate (1) of claim 1, characterized in that a width dimension of the protective plate (1) is W mm, a third distance is present between an edge of the metal layer (12) and an edge of the first fiber-resin composite layer (11) in the width direction of the protective plate (1), the dimension of the third distance being W*(2% to 12%) mm, and a fourth distance is present between the edge of the metal layer (12) and an edge of the buffer layer (13), the dimension of the fourth distance being W*(2% to 12%) mm.

12. 2. The protective plate (1) according to claim 1, characterized in that the first fiber-resin composite layer (11) comprises fibers and a resin, the fibers being at least one of carbon fibers, glass fibers, and aramid fibers, and the resin being at least one of epoxy resin, phenolic resin, polypropylene resin, and nylon resin.

13. The buffer layer (13) has a honeycomb structure (19), the pore diameter dimension of the honeycomb structure (19) is 6 mm to 10 mm, and the pore wall dimension of the honeycomb structure (19) is 0.3 mm to 0.8 mm; 2. The protective plate (1) according to claim 1, characterized in that the damping layer (13) has a foam structure.

14. A battery pack (2) comprising a tray (21) and a protective plate (1) according to any one of claims 1 to 13, the protective plate (1) being attached to the tray (21).

15. A vehicle comprising the battery pack (2) according to claim 14 and a load connected to the battery pack (2).

Images