Battery pack protective plate, 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 the priority of a Chinese patent application with an application number of 202220240991.0 and an application title of "Protection Plate for Battery Pack, Battery Pack and Vehicle", which was filed with the China National Intellectual Property Administration on January 28, 2022, and all of its contents are incorporated herein by reference.

[0002] This application relates to the technical field of new energy, and more specifically, to a protection plate for a battery pack, a battery pack and a vehicle.

Background Art

[0003] With the increasing requirements for energy conservation and environmental protection, in recent years, electric vehicles in China have been developing rapidly. Different from conventional gasoline vehicles, the driving battery is an important component of an electric vehicle. Since the driving battery case is the carrier of the driving battery, the requirements for the safety performance, mechanical performance and weight reduction of the driving 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, generally, the battery case is made of aluminum materials. However, the hardness of aluminum is low. When a stone or other protrusions rolled up by a new energy vehicle during driving impact the bottom of the battery pack, the battery case is likely to be damaged and cannot protect the battery pack better. Therefore, the function of the battery pack may fail, and there may be risks such as ignition and explosion. Therefore, generally, the safety performance of the battery pack is improved by providing a protection plate at the bottom of the battery pack.

[0005] In the prior art, usually, the protection plate is made of metal materials such as steel and aluminum. However, the protection plate made of metal materials is difficult to be subjected to anti - corrosion treatment, and the surface is easily corroded, making it difficult to meet the current usage needs.

Summary of the Invention

[0006] One objective of this application is to provide a protective plate for a battery pack, a battery pack, and a vehicle.

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

[0008] In some embodiments, the protective plate further includes a second fiber-resin composite layer provided on the side of the buffer layer away from the metal layer.

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

[0010] In some embodiments, the thickness of the protective plate is 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 thickness of the first adhesive layer is 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 thickness of the second adhesive layer is 0.1 mm to 0.3 mm.

[0013] In some embodiments, a third adhesive layer is provided between the buffer layer and the second fiber resin composite layer, and the thickness of the third adhesive layer is 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 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, a groove is provided on the side of the buffer layer facing the metal layer, and the metal layer is 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 is smaller than the second dimension, the first dimension is 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 is smaller than the fifth dimension, and the fourth dimension is smaller than the sixth dimension.

[0017] In some embodiments, the protective plate further includes a second fiber-resin composite layer provided on the side of the buffer layer away from the metal layer, wherein the second fiber-resin composite layer has 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 has 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 length of the protective plate is L mm, there is a first distance between the edge of the metal layer and the edge of the first fiber resin composite layer in the longitudinal direction of the protective plate, the dimension of the first distance is L*(3%~8%) mm, and there is a second distance between the edge of the metal layer and the edge of the buffer layer, the dimension of the second distance is L*(3%~8%) mm.

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

[0021] In some embodiments, the first fiber-resin composite layer comprises fibers and a resin, wherein the fibers are at least one of carbon fibers, glass fibers, and aramid fibers, and the resin is 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 diameter of the honeycomb structure is 6 mm to 10 mm, and the pore wall dimensions of the honeycomb structure are 0.3 mm to 0.8 mm, or the buffer layer has a foam structure.

[0023] A second embodiment of the present invention provides a battery pack, the battery pack comprising a tray and a protective plate as described in the first embodiment, wherein the protective plate is attached to the tray.

[0024] A third embodiment of the present invention provides a vehicle, the vehicle including the battery pack described in the second embodiment. [Effects of the Invention]

[0025] The present application has the following technical effects. The protection plate of the present application includes a first fiber resin composite layer, a metal layer, and a buffer layer that are sequentially laminated, and the metal layer is located between the first fiber resin composite layer and the buffer layer, avoiding the phenomenon that the metal layer of the protection plate is corroded.

[0026] The first fiber resin composite layer and the metal layer of the protection 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 protection plate to external impacts. The buffer layer has good buffering and energy absorption effects. The protection plate of the present application has both impact resistance and structural rigidity, extending the service life of the protection plate.

[0027] Hereinafter, by referring to the drawings and describing the exemplary embodiments of the present application in detail, other features and advantages of the present application will become apparent.

[0028] The drawings that form a part of the specification illustrate the embodiments of the present application and interpret the principles of the present application together with the specification.

Brief Description of the Drawings

[0029] [Figure 1] It is a schematic configuration diagram of a battery pack according to the present application. [Figure 2] It is a schematic configuration diagram of a battery tray and a protection plate according to the present application. [Figure 3] It is a schematic configuration diagram 1 of a protection plate according to the present application. [Figure 4] It is a schematic configuration diagram 2 of a protection plate according to the present application. [Figure 5] It is a schematic configuration diagram 3 of a protection plate according to the present application.

Modes for Carrying Out the Invention

[0030] Hereinafter, various exemplary embodiments of the present application will be described in detail while referring to the drawings. It should be noted that unless specifically described otherwise, the relative arrangements, mathematical formulas, and numerical values of the components and steps described in these embodiments do not limit the scope of the present application.

[0031] The following description of at least one exemplary embodiment is illustrative in nature and is not intended to limit the Application or its application or use.

[0032] Although the technology and apparatus known to those skilled in the art have not been discussed in detail, where appropriate, such technology and apparatus should be considered part of the specification.

[0033] In all the examples presented and discussed herein, any specific values ​​should be interpreted as illustrative only and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0034] Furthermore, since similar symbols and letters represent similar items in the following drawings, if something is defined in one drawing, it does not need to be considered again in subsequent drawings.

[0035] This 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 order.

[0036] In the embodiments of this disclosure, the protective plate 1 includes a first fiber-resin composite layer 11, a metal layer 12, and a buffer layer 13, the metal layer 12 being 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 composed of fiber material and resin material, and is used as the surface material of the protective plate 1, i.e., the first fiber-resin composite layer 11 is the outermost layer of the protective plate 1. The first fiber-resin composite layer 11 of this 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 this application is composed of fiber material and resin composite material, ensuring the strength and rigidity of the protective plate 1.

[0037] In the embodiments of this disclosure, a first fiber-resin composite layer 11 and a metal layer 12 are laminated. For example, the first fiber-resin composite layer 11 and the metal layer 12 may be laminated directly, or they may be laminated via a medium material. Below, for example, a case in which the first fiber-resin composite layer 11 and the metal layer 12 are laminated via a first adhesive layer 15 will be described. The first adhesive layer 15 is a medium material. In the embodiments of this application, the plastic deformation capacity of the metal layer 12 effectively compensates for the brittle fracture of the first fiber-resin composite layer 11 itself, and the resistance capacity of the protective plate 1 to external impacts can be greatly improved. In addition, by providing the first fiber-resin composite layer 11 on one surface of the metal layer 12, the phenomenon of the metal layer 12 being easily corroded is avoided. 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 embodiments of this 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 laminated via a medium material. Below, for example, the case in which the buffer layer 13 and the metal layer 12 are laminated via a second adhesive layer 16 will be described. The second adhesive layer 16 is a medium material. When the protective plate 1 is subjected to an impact during use, the buffer layer 13 has good buffering capacity and absorbs the force acting on the protective plate when it is subjected to an impact, thereby the protective plate 1 has good buffering and energy absorption properties. Specifically, the rigidity of the buffer layer 13 is less than the rigidity of the metal layer 12, that is, when the metal layer 12 and the buffer layer 13 are subjected to the same force, the deformation of the metal layer 12 is smaller, and as a result the metal layer 12 has greater structural strength, which prevents overall deformation due to excessive deformation of the bottom of the protective plate 1 and improves the structural stability of the protective plate 1. The buffer layer 13 has low rigidity and, through its own deformation, further absorbs the impact energy transmitted from the metal layer 12, suppressing the transmission speed of the impact energy and reducing the amount of impact received by the protective plate 1. After the protective plate 1 is subjected to impact, it ensures the stability of the entire structure, effectively absorbs the impact energy, improves the structural stability of the protective plate 1, and extends the service life of the protective plate 1. Furthermore, by providing the buffer layer 13 on the other surface of the metal layer 12, the phenomenon of the surface of the metal layer 12 being easily corroded is avoided.

[0039] In one embodiment, as shown in Figures 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 away from the metal layer 12.

[0040] In the embodiments of this disclosure, the second fiber-resin composite layer 14 is provided on the buffer layer 13 and on the side opposite 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 order. The present invention further improves the structural rigidity of the protective plate 1 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 contain fiber material and resin material, with the weight percentage of fiber material ranging from 50% to 60% of the fiber-resin composite layer and the weight percentage of resin material ranging from 35% to 50% of the fiber-resin composite layer. In this embodiment, the fiber material and 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 possess characteristics such as lightness, collision resistance, and impact resistance.

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

[0043] In this embodiment, the thickness of the first fiber-resin composite layer 11, the metal layer 12, the buffer layer 13, and the second fiber-resin composite layer 14 is limited, and the thickness of the protective plate 1 is reduced as much as possible while still meeting the requirements for structural strength, rigidity, and impact resistance of the protective plate 1, thereby improving the weight reduction effect. By applying the protective plate 1 to the battery pack 2, the overall height space of the battery pack 2 is reduced.

[0044] In conventional technology, the protective plate is a metal protective plate, and a coating is provided on the surface of the metal protective plate to prevent corrosion. 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 achieving a further weight reduction 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, and 1.0 mm.

[0045] In this embodiment, the thickness of the metal layer 12 is limited, and the thickness of the metal layer 12 is reduced as much as possible while still 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, and 1.2 mm.

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

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

[0048] In this embodiment, the overall thickness of the protective plate 1 is limited, and while satisfying the requirement for lightweight installation of the protective plate, the rigidity and strength of the protective plate 1 are ensured, and the phenomenon of the protective plate 1 being prone to bending when it is subjected to 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 thickness of the second adhesive layer 16 is 0.1 mm to 0.3 mm.

[0051] In one specific embodiment, as shown in Figure 3, in the first fiber-resin composite layer 11, the metal layer 12, and the buffer layer 13, adjacent layers are bonded together by an adhesive layer to form a 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 together 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 together by the second adhesive layer 16. The first adhesive layer 15 and the second adhesive layer 16 may be of the same type of adhesive layer, or they may be of 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 by melting the hot-melt adhesive film with 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 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 by melting the hot-melt adhesive film with 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 by the spray adhesive layer.

[0052] To prevent 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, preferably 0.15 mm to 0.2 mm. The thickness of the second adhesive layer 16 is 0.1 mm to 0.3 mm, preferably 0.15 mm to 0.2 mm.

[0053] In the embodiments of this 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 reliability of the connections between adjacent layers and to avoid cracking of the protective plate 1 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 embodiments of this disclosure, the buffer layer 13 and the second fiber-resin composite layer 14 are bonded together 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 together by melting the hot-melt adhesive film with a heating and pressurizing 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 together by the spray adhesive layer. The thickness of the third adhesive layer is 0.1 mm to 0.3 mm, 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 inside 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, or 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 inside the groove 17.

[0057] In one specific embodiment, as shown in Figure 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 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 by a spray adhesive layer.

[0058] As shown in Figure 4, the metal layer 12 and the buffer layer 13 are not connected by an adhesive layer, but one or more molten portions are provided between the metal layer 12 and the buffer layer 13, and the metal layer 12 and the buffer layer 13 are connected via the molten portions. For example, the molten portions may be distributed in the circumferential direction of the metal layer 12 and the buffer layer 13, or they may be distributed diagonally between the metal layer 12 and the buffer layer 13, or they 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 melted by a hot press method to form the molten portions.

[0059] Specifically, a position limiting post 18 is provided in the buffer layer 13, and a connection hole 20 is provided in the metal layer 12 to match the position limiting post 18. The position limiting post 18 fits 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. The position limiting post 18 is melted by a hot press method, forming a molten portion. The metal layer 12 and the buffer layer 13 are connected via the molten portion (i.e., the molten position limiting post 18), and one end of the molten portion is connected to the connection hole 20. This fixes one end of the molten portion to the metal layer 12 and the other end of the molten portion to the buffer layer 13, 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 as shown in Figure 4, one end of the position limiting post 18 is fixed in a hole in the honeycomb structure.

[0060] In another specific embodiment, as shown in Figure 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 positioned within 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 pre-fixed by the groove 17, and after pre-fixing, the second adhesive layer 16 provided between the metal layer 12 and the buffer layer 13 is melted by a heating and pressing device, thereby bonding the metal layer 12 and the buffer layer 13 and 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 is smaller than the second dimension, the first dimension is 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 is smaller than the fifth dimension, and the fourth dimension is 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 corrosion of the metal layer 12.

[0063] Specifically, in the longitudinal direction of the protective plate 1 (see the direction of arrow a in Figure 3), the length of the metal layer 12 is smaller than the length of the first fiber-resin composite layer 11, and the length of the metal layer 12 is smaller than the length 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. That is, the surface area dimension 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] Because 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, during the molding of the protective plate 1, a portion of the first fiber-resin composite layer 11 is laminated onto the metal layer 12, and the other portion of the first fiber-resin composite layer 11 is laminated onto the buffer layer 13. As a result, the metal layer 12 is positioned between the first fiber-resin composite layer 11 and the buffer layer 13, preventing corrosion of the surface of the metal layer 12.

[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 the embodiments of this disclosure, if the length dimension of the buffer layer 13 is smaller than the length dimension of the first fiber-resin composite layer 11, and 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, then a portion of the first fiber-resin composite layer 11 is laminated onto the metal layer 12, and the other portion of the first fiber-resin composite layer 11 is laminated onto the second fiber-resin composite layer 14, thereby encasing the metal layer 12 and avoiding the phenomenon of corrosion of the metal layer 12.

[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, by limiting the relationship between the length dimension of the first fiber-resin composite layer 11 and the length dimension of the buffer layer 13, and by limiting the relationship between the width dimension of the first fiber-resin composite layer 11 and the width dimension of the buffer layer 13, and 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] If the second fiber-resin composite layer 14 is not included, preferably the length of the first fiber-resin composite layer 11 is equal to the length of the buffer layer 13, and at the same time, the width of the first fiber-resin composite layer 11 is equal to the width of the buffer layer 13, in which case a portion of the first fiber-resin composite layer 11 is laminated on the metal layer 12, and the other portion of the first fiber-resin composite layer 11 is laminated on the buffer layer 13.

[0071] When a second fiber-resin composite layer 14 is included, the length of the first fiber-resin composite layer 11 is greater than the length of the buffer layer 13, the width of the first fiber-resin composite layer 11 is greater than the width of the buffer layer 13, and at the same time, the length of the first fiber-resin composite layer 11 and the length of the second fiber-resin composite layer 14 are equal, and the width of the first fiber-resin composite layer 11 and the width 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 onto the metal layer 12, and the other portion of the first fiber-resin composite layer 11 is laminated onto the second fiber-resin composite layer 14.

[0072] In one embodiment, the length 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%~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%~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 is W*(2%~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 is W*(2%~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, and 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 which the first distance is L*(3%~8%) mm. Alternatively, 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 which the first distance is L*(3%~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 of the metal layer 12 is smaller than the length of the first fiber resin composite layer 11, and the length of the metal layer 12 is smaller than the length 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%~8%) mm. There is also 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%~8%) mm. This ensures that the metal layer 12 is positioned between the first fiber-resin composite layer 11 and the buffer layer 13, preventing corrosion of the surface of the metal layer 12 provided along the longitudinal direction of the protective plate 1. At the same time, because 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 and second distances to 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, and 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 eleventh edge and a twelfth edge, the seventh edge and the eleventh edge are located on the same side, the eighth edge and the twelfth edge are located on the same side, there is a fourth distance between the seventh edge and the eleventh edge, and there is a fourth distance between the eighth edge and the twelfth 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%~12%) mm. There is also 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%~12%) mm. As a result, the metal layer 12 is positioned between the first fiber-resin composite layer 11 and the buffer layer 13, preventing corrosion of the surface of the metal layer 12 provided along the width direction of the protective plate 1. At the same time, the metal layer 12 is not provided in the edge region in the width direction of the protective plate 1. In this embodiment, by limiting the third and fourth distances to this range, the structural strength of the edge region of the protective plate 1 is improved.

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

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

[0082] In this embodiment, in order to improve the structural strength of the protective plate 1, the type of fiber and resin of the first fiber-resin composite layer 11 are limited. 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 diameter of the honeycomb structure 19 is 6 mm to 10 mm, and the pore wall dimensions of the honeycomb structure 19 are 0.3 mm to 0.8 mm, 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 spatial dimensions and hole wall dimensions of the honeycomb structure, the buffer layer 13 can have better buffering and energy absorption effects.

[0085] Furthermore, 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 overall rigidity of the protective plate 1.

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

[0087] A second embodiment of the present invention provides a battery pack 2, the battery pack 2 comprising a tray 21 and a protective plate as described in the first embodiment, wherein the protective plate 1 is attached to the tray 21.

[0088] This embodiment provides a battery pack 2. The battery pack 2 includes a protective plate 1 of the present invention, which is attached to a tray 21 of the battery pack 2. The protective plate 1 serves to protect the battery pack 2 and improve the safety of the battery pack 2. As shown in Figure 1, the battery pack 2 consists of a seal cover 23, cells 22, a tray 21, and a protective plate 1. A housing space for housing the cells 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 embodiment of the present invention provides a vehicle, the vehicle including the battery pack 2 described in the second embodiment.

[0090] This embodiment provides a vehicle including the battery pack 2 and a load connected to the battery pack. The load includes, but is not limited to, an inverter, an air conditioning compressor, etc. The battery pack 2 is applied to the vehicle, the safety of the battery pack 2 is guaranteed, and the safety of the vehicle while it is in operation is further improved.

[0091] In the above embodiments, the differences between each embodiment are explained in detail. The different optimal features of each embodiment can be combined to form a more preferable embodiment, as long as they are not contradictory. For the sake of brevity, further explanation is omitted here.

[0092] Although several specific embodiments of this application have been described in detail with examples, those skilled in the art should understand that these examples are for illustrative purposes only and do not limit the scope of this application. Those skilled in the art should understand that these embodiments can be modified without departing from the scope and spirit of this application. The scope of this application is limited by the attached 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 grooves 18 Location-Restricted Posts 19 Honeycomb structure 20 connection holes 2 Battery Packs 21 trays 22 cells 23 Seal cover

Claims

1. It includes a first fiber resin composite layer (11), a metal layer (12), and a buffer layer (13) which are arranged in order, The protective plate (1) for a battery pack (2) is characterized in that the buffer layer (13) has a honeycomb structure (19), the hole diameter of the honeycomb structure (19) is 6 mm to 10 mm, and the hole wall dimensions of the honeycomb structure (19) are 0.3 mm to 0.8 mm.

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) away from the metal layer (12).

3. The protective plate (1) according to claim 2, characterized in that the thickness of the first fiber-resin composite layer (11) is 0.3 mm to 1.0 mm, the thickness of the metal layer (12) is 0.6 mm to 1.2 mm, the thickness of the buffer layer (13) is 6 mm to 12 mm, and the thickness of the second fiber-resin composite layer (14) is 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 7 to 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 thickness of the first adhesive layer (15) is 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 thickness of the second adhesive layer (16) is 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. comprising a first fiber resin composite layer (11), a metal layer (12), and a buffer layer (13) arranged in order, The buffer layer (13) and the metal layer (12) are connected via a molten portion, a connecting hole (20) is formed in the metal layer (12), one end of the molten portion is located inside the connecting hole (20) and connected to the inner wall of the connecting hole (20), and the other end of the molten portion is connected to the buffer layer (13), or A protective plate (1) for a battery pack (2) is 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 is smaller than the second dimension, the first dimension is smaller than the third dimension, and / or The protective plate (1) according to 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), the buffer layer (13) has a sixth dimension in the width direction of the protective plate (1), the fourth dimension is smaller than the fifth dimension, and the fourth dimension is smaller than the sixth dimension.

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 includes a second fiber-resin composite layer (14) provided on the side of the buffer layer (13) away from the metal layer (12), wherein 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, as described in claim 8.

11. The length 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 / or, 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) according to claim 1, characterized in that the width dimension of the protective plate (1) is W mm, there is a third distance between the edge of the metal layer (12) and the edge of the first fiber resin composite layer (11) in the width direction of the protective plate (1), the dimension of the third distance is 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 is W* (2% to 12%) mm.

12. The protective plate (1) according to claim 1, characterized in that the first fiber-resin composite layer (11) comprises 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.

13. A battery pack (2) comprising a tray (21) and a protective plate (1) according to any one of claims 1 to 12, wherein the protective plate (1) is attached to the tray (21).

14. A vehicle comprising a battery pack (2) as described in claim 13 and a load connected to the battery pack (2).

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