Protective plate for battery pack, battery pack and vehicle

Abstract

The present disclosure discloses a protective plate for a battery pack, a battery pack, and a vehicle. The protective plate comprises a first fiber-resin composite layer, a metal layer, and a buffer layer sequentially laminated.

Description

Technology Field

[0001] Cross-reference regarding related applications

[0002] The present disclosure claims priority to Chinese patent application No. 202220240991.0, filed on January 28, 2022, with the title of the invention "Protective plate for battery pack, battery pack and vehicle," the entirety of which is incorporated herein by reference.

[0003] field

[0004] The present disclosure relates to the field of new energy technology, and more specifically to a protective plate for a battery pack, a battery pack, and a vehicle. Background Technology

[0005] Electric vehicles in China have made rapid progress in recent years due to increasing demands for energy conservation and environmental protection. Unlike traditional fuel-powered vehicles, power batteries are a critical component of electric vehicles. As carriers for power batteries, increasingly stringent requirements are being placed on the safety, mechanical performance, and lightweighting of power battery housings.

[0006] Currently, battery housings are primarily made of metal materials. To reduce the weight of the vehicle body, battery housings are generally constructed from aluminum. However, due to the low rigidity of aluminum, if stones or other sharp objects generated by the new energy vehicle strike the bottom of the battery pack while driving, there is a risk of the housing breaking and failing to adequately protect the battery pack, leading to failure and even risks of fire and explosion. Therefore, protective plates are typically installed on the bottom of the battery pack to enhance its safety performance.

[0007] In conventional technology, protective plates are often prepared from steel, aluminum, and other metal materials. However, protective plates made of metal materials are difficult to process for corrosion protection and their surfaces corrode easily, making it difficult to meet current requirements during use.

[0008] The purpose of the present disclosure is to provide a protective plate for a battery pack, a battery pack, and a vehicle.

[0009] In a first aspect of the present disclosure, a protective plate for a battery pack is provided. The protective plate comprises a first fiber-resin composite layer, a metal layer, and a buffer layer that are sequentially laminated.

[0010] In some embodiments, the protective plate further comprises a second fiber-resin composite layer, and the second fiber-resin composite layer is arranged on the side of the buffer layer facing away from the metal layer.

[0011] In some embodiments, the thickness of the first fiber-resin composite layer is in the range of 0.3 mm to 1.0 mm, the thickness of the metal layer is in the range of 0.6 mm to 1.2 mm, the thickness of the buffer layer is in the range of 6 mm to 12 mm, and the thickness of the second fiber-resin composite layer is in the range of 0.5 mm to 1.0 mm.

[0012] In some embodiments, the thickness of the protective plate is in the range of 7 mm to 15 mm.

[0013] In some embodiments, the first adhesive layer is arranged between the first fiber-resin composite layer and the metal layer, and the thickness of the first adhesive layer is in the range of 0.1 mm to 0.3 mm.

[0014] In some embodiments, the second adhesive layer is arranged between the metal layer and the buffer layer, wherein the thickness of the second adhesive layer is in the range of 0.1 mm to 0.3 mm.

[0015] In some embodiments, the third adhesive layer is arranged between the buffer layer and the second fiber-resin composite layer, wherein the thickness of the third adhesive layer is in the range of 0.1 mm to 0.3 mm.

[0016] In some embodiments, the buffer layer and the metal layer are connected by a molten component. The metal layer has a connecting hole, one end of the molten component is positioned within the connecting hole and connected to the inner wall of the connecting hole, and the other end of the molten component is connected to the buffer layer.

[0017] In some embodiments, the recess is arranged on the side of the buffer layer and faces the metal layer, and the metal layer is located within the recess.

[0018] 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, and the buffer layer has a third dimension in the longitudinal direction of the protective plate, the first dimension is smaller than the second dimension, and the first dimension is smaller than the third dimension; and / or

[0019] 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, and 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.

[0020] In some embodiments, the protective plate further comprises a second fiber-resin composite layer, the second fiber-resin composite layer being arranged on the side of the buffer layer facing away from the metal layer. The second fiber-resin composite layer has a seventh dimension in the longitudinal direction of the protective plate, the seventh dimension being the same as 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 the same as the eighth dimension.

[0021] 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.

[0022] In some embodiments, the protective plate has a length dimension of L mm. In the longitudinal direction of the protective plate, there exists a first distance between the edge of the metal layer and the edge of the first fiber-resin composite layer, and the dimension of the first distance is L*(3% to 8%) mm;

[0023] There is a second distance between the edge of the metal layer and the edge of the buffer layer, and the dimension of the second distance is L*(3% to 8%)mm.

[0024] In some embodiments, the protective plate has a width dimension of W mm. In the width direction of the protective plate, there exists a third distance between the edge of the metal layer and the edge of the first fiber-resin composite layer, and the dimension of the third distance is W * (2% to 12%) mm;

[0025] There is a fourth distance between the edge of the metal layer and the edge of the buffer layer, and the dimension of the fourth distance is W*(2% to 12%)mm.

[0026] In some embodiments, the first fiber-resin composite layer comprises a fiber and a resin, the fiber is at least one of carbon fiber, glass fiber and aramid fiber, and the resin is at least one of epoxy resin, phenolic resin, polypropylene resin and nylon resin.

[0027] In some embodiments, the buffer layer has a honeycomb structure, the hole size of the honeycomb structure is in the range of 6 mm to 10 mm, and the hole wall dimension of the honeycomb structure is in the range of 0.3 mm to 0.8 mm; or the buffer layer has a foam structure.

[0028] In a second aspect of the present disclosure, a battery pack is provided. The battery pack comprises a tray and a protective plate according to a first aspect, wherein the protective plate is mounted on the tray.

[0029] In a third aspect of the present disclosure, a vehicle comprising a battery pack according to a second aspect is provided.

[0030] One technical effect of the present disclosure is that a protective plate according to the present disclosure comprises a first fiber-resin composite layer, a metal layer, and a buffer layer sequentially laminated, wherein the metal layer is positioned between the first fiber-resin composite layer and the buffer layer to prevent corrosion of the metal layer of the protective plate.

[0031] In the protective plate of the present disclosure, a first fiber-resin composite layer and a metal layer are laminated. The plastic deformation capability of the metal layer can effectively compensate for the brittle fracture of the first fiber-resin composite layer itself, thereby significantly improving the external impact resistance of the protective plate. Additionally, the cushioning layer has good cushioning and energy absorption performance. Therefore, the protective plate of the present disclosure possesses both impact resistance and structural rigidity, thereby extending the lifespan of the protective plate.

[0032] Further features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure described with reference to the drawings. Brief explanation of the drawing

[0033] The accompanying drawings, which constitute part of this specification, illustrate embodiments of the present disclosure and are used together with the specification to explain the principles of the present disclosure. FIG. 1 is a schematic structural diagram of a battery pack according to the present disclosure. FIG. 2 is a schematic structural diagram of a battery tray and a protective plate according to the present disclosure. FIG. 3 is a first schematic structural diagram of a protective plate according to the present disclosure. FIG. 4 is a second schematic structural diagram of a protective plate according to the present disclosure. FIG. 5 is a schematic structural diagram of a protective plate according to the present disclosure. Specific details for implementing the invention

[0034] Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the attached drawings. Unless specifically otherwise specified, the relative arrangement of components and steps, numerical expressions, and numerical values ​​described in the embodiments do not limit the scope of the present disclosure.

[0035] The following description of at least one exemplary embodiment is merely illustrative and does not constitute any limitation to the disclosure and its application or use in any way.

[0036] Technologies and devices known to a person skilled in the art may not be discussed in detail, but where appropriate, technologies and devices should be taken into account as part of this specification.

[0037] In all examples illustrated and discussed in this specification, any specific value should be interpreted merely as exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0038] It should be noted that in the following drawings, similar reference numerals and letters represent similar items. Therefore, once an item is defined in one drawing, it does not need to be described further in subsequent drawings.

[0039] The present disclosure provides a protective plate (1) for a battery pack, as illustrated in FIG. 1. The protective plate (1) has a structure in which a first fiber-resin composite layer (11), a metal layer (12), and a buffer layer (13) are sequentially laminated.

[0040] In an embodiment of the present disclosure, the protective plate (1) comprises a first fiber-resin composite layer (11), a metal layer (12), and a buffer layer (13), wherein the metal layer (12) is positioned between the first fiber-resin composite layer (11) and the buffer layer (13). The first fiber-resin composite layer (11) has a composite sheet structure containing fiber and resin materials. The first fiber-resin composite layer (11) functions as a 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 disclosure has good corrosion resistance and can also increase the scratch and impact resistance of the surface of the metal layer (12). The first fiber-resin composite layer (11) of the present disclosure is composed of a composite material of fiber and resin, which ensures the strength and rigidity of the protective plate (1).

[0041] In an embodiment of the present disclosure, the first fiber-resin composite layer (11) and the metal layer (12) are laminated together. For example, the first fiber-resin composite layer (11) and the metal layer (12) may be laminated directly together, or the first fiber-resin composite layer (11) and the metal layer (12) may be laminated together with the help of an interlayer material. For example, the first fiber-resin composite layer (11) and the metal layer (12) are described below as being laminated together by a first adhesive layer (15). The first adhesive layer (15) functions as an intermediate material. In the embodiments of the present application, the plastic deformation capability of the metal layer (12) can effectively compensate for the brittle fracture of the first fiber-resin composite layer (11) itself, thereby significantly improving the external impact resistance of the protective plate (1). Additionally, the first fiber-resin composite layer (11) is arranged on the surface of the metal layer (12) to prevent the metal layer (12) from easily corroding. For example, the metal layer (12) may be made of steel, aluminum, titanium alloy, etc. In some embodiments, the metal layer (12) is a steel plate.

[0042] In an embodiment of the present disclosure, the buffer layer (13) and the metal layer (12) are laminated together. For example, the buffer layer (13) and the metal layer (12) may be laminated together directly, or the buffer layer (13) and the metal layer (12) may be laminated together with the help of an interlayer material. For example, the buffer layer (13) and the metal layer (12) are described below as being laminated together by a second adhesive layer (16). The second adhesive layer (16) functions as an intermediate material. During use, when the protective plate (1) is subjected to impact, the buffer layer (13) has good cushioning ability, so the buffer layer (13) can absorb the force applied to the protective plate during impact, and thus the protective plate (1) has good cushioning and energy absorption performance. In particular, the stiffness of the buffer layer (13) is less than that of the metal layer (12). That is, when the metal layer (12) and the buffer layer (13) are subjected to impact with the same force, the deformation of the metal layer (12) is smaller. Therefore, since the metal layer (12) has greater structural strength, it can prevent global deformation caused by excessive deformation of the bottom of the protective plate (1), thereby improving the structural stability of the protective plate (1). The buffer layer (13) has low rigidity and can absorb more impact energy transmitted from the metal layer (12) through self-deformation, thereby suppressing the speed of impact energy transmission and mitigating the impact on the protective plate (1). After the protective plate (1) is impacted, overall structural stability can be ensured and impact energy can be effectively absorbed, thereby improving the structural stability of the protective plate (1) and extending the lifespan of the protective plate (1). Additionally, the buffer layer (13) can be placed on a different surface of the metal layer (12) to prevent the surface of the metal layer (12) from easily corroding.

[0043] In one embodiment, as illustrated in FIGS. 2 to 5, the protective plate (1) further comprises a second fiber-resin composite layer (14). The second fiber-resin composite layer (14) is arranged on the side of the buffer layer (13) facing away from the metal layer (12).

[0044] In one embodiment of the present disclosure, the second fiber-resin composite layer (14) is arranged on the buffer layer (13) and extends away from the metal layer (12). For example, the protective plate (1) comprises a first fiber-resin composite layer (11), a metal layer (12), a buffer layer (13), and a second fiber-resin composite layer (14) that are sequentially stacked. In the present disclosure, the second fiber-resin composite layer (14) is additionally arranged to further enhance the structural rigidity of the protective plate (1).

[0045] In one embodiment, both the first fiber-resin composite layer (11) and the second fiber-resin composite layer (14) comprise fiber and resin materials, wherein the fiber material accounts for 50% to 60% by weight of the fiber-resin composite layer and the resin material accounts for 35% to 50% by weight of the fiber-resin composite layer. In this embodiment, the fiber material and the resin material of the first fiber-resin composite layer (11) and the second fiber-resin composite layer (14) are defined so that both the first fiber-resin composite layer (11) and the second fiber-resin composite layer (14) have integrated characteristics such as lightweightness, impact resistance, and impact resistance.

[0046] In one embodiment, as shown in FIGS. 2 to 5, the thickness of the first fiber-resin composite layer (11) is in the range of 0.3 mm to 1.0 mm, the thickness of the metal layer (12) is in the range of 0.6 mm to 1.2 mm, the thickness of the buffer layer (13) is in the range of 6 mm to 12 mm, and the thickness of the second fiber-resin composite layer (14) is in the range of 0.5 mm to 1.0 mm.

[0047] 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 defined to reduce the thickness of the protective plate (1) as much as possible and enhance the lightweighting effect while satisfying the structural strength, rigidity, and impact resistance of the protective plate (1). The protective plate (1) is applied to the battery pack (2) to reduce the overall height space of the battery pack (2).

[0048] In the relevant technology, the protective plate is a metal protective plate. To prevent corrosion of the metal protective plate, a coating is arranged on the surface of the metal protective plate. The thickness of the coating formed on the metal surface is generally in the range of 1.5 mm to 3.0 mm. In this embodiment, to achieve a lightweight design and reduce the overall thickness of the protective plate (1), a first fiber-resin composite layer (11) is arranged on the surface of the metal layer (12), and the thickness of the first fiber-resin composite layer (11) is in the range of 0.3 mm to 1.0 mm. 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.

[0049] In this embodiment, the thickness of the metal layer (12) is defined to reduce the thickness of the metal layer (12) as much as possible while satisfying the structural strength of the protective layer (1). For example, the thickness of the metal layer (12) is 0.6 mm, 0.8 mm, 1 mm, or 1.2 mm.

[0050] In this embodiment, the thickness of the buffer layer (13) is defined to reduce the thickness of the buffer layer (13) as much as possible while 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.

[0051] In one embodiment, the thickness of the protective plate (1) is in the range of 7 mm to 15 mm.

[0052] In this embodiment, the total thickness of the protective plate (1) is defined to ensure the rigidity and strength of the protective plate (1) during a collision or impact and to prevent bending of the protective plate (1) while satisfying the lightweight design of the protective plate.

[0053] In one embodiment, as shown in FIGS. 3 to 5, a first adhesive layer (15) is arranged between the first fiber-resin composite layer (11) and the metal layer (12), and the thickness of the first adhesive layer (15) is in the range of 0.1 mm to 0.3 mm.

[0054] In one embodiment, the second adhesive layer (16) is arranged between the metal layer (12) and the buffer layer (13), and the thickness of the second adhesive layer (16) is in the range of 0.1 mm to 0.3 mm.

[0055] In a specific embodiment, as illustrated in FIG. 3, adjacent layers of the first fiber-resin composite layer (11), metal layer (12), and buffer layer (13) are bonded by an adhesive to form a protective plate (1). For example, a first adhesive layer (15) is arranged 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 arranged 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 the first adhesive layer (15) and the second adhesive layer (16) may be of different types of adhesive layers. For example, the first adhesive layer (15) is a hot-melt adhesive film that is melted by a heating and pressurizing means to bond the first fiber-resin composite layer (11) and the metal layer (12) together. Alternatively, the first adhesive layer (15) is a coated adhesive layer, and the first fiber-resin composite layer (11) and the metal layer (12) are directly bonded by the coated adhesive layer. The second adhesive layer (16) is a hot-melt adhesive film that is melted by a heating and pressurizing means to bond the buffer layer (13) and the metal layer (12) together. Alternatively, the second adhesive layer (16) is a coated adhesive layer, and the buffer layer (13) and the metal layer (12) are directly bonded by the coated adhesive layer.

[0056] The thickness of the first adhesive layer (15) and the second adhesive layer (16) is specified to avoid excessive thickness of the protective plate (1). 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 in the range of 0.1 mm to 0.3 mm, and optionally, the thickness of the first adhesive layer (15) is in the range of 0.15 mm to 0.2 mm. The thickness of the second adhesive layer (16) is in the range of 0.1 mm to 0.3 mm, and optionally, the thickness of the second adhesive layer (16) is in the range of 0.15 mm to 0.2 mm.

[0057] In one embodiment of the present disclosure, the connection mode between the thicknesses of the first fiber-resin composite layer (11), the metal layer (12), and the buffer layer (13) is defined to improve the reliability of the connection between adjacent layers and to prevent the breakage of the protective plate (1) during use.

[0058] In one embodiment, the third adhesive layer is arranged between the buffer layer (13) and the second fiber-resin composite layer (14), and the thickness of the third adhesive layer is in the range of 0.1 mm to 0.3 mm.

[0059] In one embodiment of the present 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 that is melted by a heating and pressurizing means to bond the second fiber-resin composite layer (14) and the buffer layer together. Alternatively, the third adhesive layer is a coated adhesive layer, and the second fiber-resin composite layer (14) and the buffer layer (13) are directly bonded by the coated adhesive layer. The thickness of the third adhesive layer is in the range of 0.1 mm to 0.3 mm, and optionally, the thickness of the third adhesive layer is in the range of 0.15 mm to 0.2 mm.

[0060] In one embodiment, as illustrated in FIG. 4, the buffer layer (13) and the metal layer (12) are connected by a molten component. The metal layer (12) has a connecting hole (20), one end of the molten component is positioned within the connecting hole (20) and connected to the inner wall of the connecting hole (20), and the other end of the molten component is connected to the buffer layer (13). Alternatively,

[0061] A recess (17) is arranged on one side of the buffer layer (13) toward the metal layer (12), and the metal layer (12) is located within the recess (17).

[0062] In a specific embodiment, as illustrated in FIG. 3, the first fiber-resin composite layer (11) and the metal layer (12) are bonded by a first adhesive layer (15). For example, the first adhesive layer (15) is a hot-melt adhesive film that is melted by a heating and pressurizing means to bond the first fiber-resin composite layer (11) and the metal layer (12) together. Alternatively, the first fiber-resin composite layer (11) and the metal layer (12) are bonded together by a coated adhesive layer.

[0063] As illustrated in FIG. 4, the metal layer (12) and the buffer layer (13) are not bonded by an adhesive layer, but one or more molten components are arranged between the metal layer (12) and the buffer layer (13), and the metal layer (12) and the buffer layer (13) are connected by the molten components. For example, the molten components may be distributed along the circumferential direction of the metal layer (12) and the buffer layer (13), the molten components may be distributed diagonally between the metal layer (12) and the buffer layer (13), or the molten components may be distributed in an array between the metal layer (12) and the buffer layer (13). In this embodiment, the limit posts (18) arranged in the metal layer (12) and the buffer layer (13) are made into a molten state by hot pressing to form the molten components.

[0064] In particular, the buffer layer (13) is arranged together with the limit post (18), and the metal layer (12) is provided with a connecting hole (20) that matches the limit post (18). The limit post (18) is fitted into the connecting hole (20). That is, one end of the limit post (18) is fixed on the buffer layer (13), and the other end of the limit post (18) is fixed to the metal layer (12) by the connecting hole (20). The limit post (18) is melted by a hot pressing process to form a molten component. The metal layer (12) and the buffer layer (13) are connected by the molten component (i.e., the molten limit post (18)). One end of the molten component is inserted into the connecting hole (20) to fix one end of the molten component to the metal layer (12) and the other end of the molten component to the buffer layer (13), thereby improving the connection strength between the metal layer (12) and the buffer layer (13). For example, the limit post (18) is a plastic post. For example, the buffer layer (13) has a honeycomb structure. As shown in FIG. 4, one end of the limit post (18) is fixed in the hole of the honeycomb structure.

[0065] In another specific embodiment, as illustrated in FIG. 5, a first adhesive layer (15) is arranged 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 arranged 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). In this embodiment, to further improve the connection strength between the metal layer (12) and the buffer layer (13), a recess (17) is formed in the buffer layer (13), and the metal layer (12) is positioned within the recess (17). When the metal layer (12) is embedded in the recess (17), the metal layer (12) and the buffer layer (13) are initially fixed through the recess (17). After initial fixation, the second adhesive layer (16) placed between the metal layer (12) and the buffer layer (13) is melted by a heating and pressurizing means to bond the metal layer (12) and the buffer layer (13) together. This further improves the connection strength between the metal layer (12) and the buffer layer (13) that are bonded together.

[0066] In one embodiment, as illustrated in FIGS. 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), and the buffer layer (13) has a third dimension in the longitudinal direction of the protective plate (1), wherein the first dimension is smaller than the second dimension and the first dimension is smaller than the third dimension; and / or

[0067] 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), wherein the fourth dimension is smaller than the fifth dimension and the fourth dimension is smaller than the sixth dimension.

[0068] In this embodiment, the metal layer (12) is positioned between the first fiber-resin composite layer (11) and the buffer layer (13), and the length and width dimensions of the metal layer (12) are defined to prevent corrosion of the metal layer (12).

[0069] In particular, in the longitudinal direction of the protective plate (1) (as shown in FIG. 3, the direction indicated by arrow a), 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).

[0070] In the width direction of the protective plate (1) (as shown in FIG. 3, the direction indicated by arrow b), 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 of ​​the metal layer (12) is smaller than the surface area of ​​the first fiber-resin composite layer (11), and the surface area of ​​the metal layer (12) is smaller than the surface area of ​​the buffer layer (13).

[0071] Since the surface area of ​​the metal layer (12) is smaller than the surface area of ​​the first fiber-resin composite layer (11) and the surface area of ​​the metal layer (12) is smaller than the surface area of ​​the buffer layer (13), in the process of forming the protective plate (1), a part of the first fiber-resin composite layer (11) is laminated with the metal layer (12), and another part of the first fiber-resin composite layer (11) is laminated with 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 surface corrosion of the metal layer (12).

[0072] In one embodiment, the second fiber-resin composite layer (14) has a seventh dimension in the longitudinal direction of the protective plate (1), and the seventh dimension is the same as 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), and the fifth dimension is the same as the eighth dimension.

[0073] In an embodiment of the present disclosure, if 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), 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 part of the first fiber-resin composite layer (11) will be laminated with the metal layer (12), and another part of the first fiber-resin composite layer (11) will be laminated with the second fiber-resin composite layer (14), so the metal layer (12) is wrapped to prevent corrosion of the metal layer (12).

[0074] Also, 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.

[0075] 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 defined so that each surface of the metal layer (12) is not exposed to the outside and each surface of the metal layer (12) is not corroded, 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 defined.

[0076] In the absence of the second fiber-resin composite layer (14), optionally, the length dimension of the first fiber-resin composite layer (11) is the same as the length dimension of the buffer layer (13), and the width dimension of the first fiber-resin composite layer (11) is the same as the width dimension of the buffer layer (13). In this case, a portion of the first fiber-resin composite layer (11) will be laminated with the metal layer (12), and another portion of the first fiber-resin composite layer (11) will be laminated with the buffer layer (13).

[0077] In the case where a second fiber-resin composite layer (14) is present, the length dimension of the first fiber-resin composite layer (11) is greater than the length dimension of the buffer layer (13), the width dimension of the first fiber-resin composite layer (11) is greater than the width dimension of the buffer layer (13), the length dimension of the first fiber-resin composite layer (11) is equal to the length dimension of the second fiber-resin composite layer (14), and the width dimension of the first fiber-resin composite layer (11) is equal to the width dimension of the second fiber-resin composite layer (14). In this case, a part of the first fiber-resin composite layer (11) will be laminated with the metal layer (12), and another part of the first fiber-resin composite layer (11) will be laminated with the second fiber-resin composite layer (14).

[0078] In one embodiment, the protective plate (1) has a length dimension of L mm. In the longitudinal direction (L) 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), and the dimension of the first distance is L* (3% to 8%) mm.

[0079] 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 L*(3% to 8%)mm.

[0080] The protective plate (1) has a width dimension of W mm. 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), and the dimension of the third distance is W * (2% to 12%) mm.

[0081] 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 W*(2% to 12%)mm.

[0082] In this embodiment, along 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, and the second edge and the fourth edge are located on the same side. A first distance exists between the first edge of the metal layer (12) and the third edge of the first fiber-resin composite layer (11), and the dimension of the first distance is L*(3% to 8%)mm. Alternatively, a first distance exists between the second edge of the metal layer (12) and the fourth edge of the first fiber-resin composite layer (11), and the dimension of the first distance is L*(3% to 8%)mm.

[0083] Likewise, along 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, and the second edge and the sixth edge are located on the same side. A second distance exists between the first edge and the fifth edge, and a second distance exists between the second edge and the sixth edge.

[0084] 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, the first distance is defined to exist 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 L*(3% to 8%) mm. The second distance is defined to exist between the edge of the metal layer (12) and the edge of the buffer layer (13), and the dimension of the second distance is L*(3% to 8%) mm. In this way, the metal layer (12) is positioned between the first fiber-resin composite layer (11) and the buffer layer (13) to prevent corrosion of the surface of the metal layer (12) arranged along the longitudinal direction of the protective plate (1). Additionally, 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 arranged in the longitudinal edge region of the protective plate (1). In this embodiment, by defining the first distance and the second distance within this range, the structural strength of the edge region of the protective plate (1) is improved.

[0085] 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, and the eighth edge and the tenth edge are located on the same side. A third distance exists between the seventh edge and the ninth edge, and a third distance exists between the eighth edge and the tenth edge.

[0086] Likewise, in the width direction of the protective plate (1), the buffer layer (13) has a 11th edge and a 12th edge. The 7th edge and the 11th edge are located on the same side, and the 8th edge and the 12th edge are located on the same side. A fourth distance exists between the 7th edge and the 11th edge, and a fourth distance exists between the 8th edge and the 12th edge.

[0087] 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, a third distance is defined to exist 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 W*(2% to 12%)mm. A fourth distance is defined to exist between the edge of the metal layer (12) and the edge of the buffer layer (13), and the dimension of the fourth distance is W*(2% to 12%)mm. In this way, the metal layer (12) is positioned between the first fiber-resin composite layer (11) and the buffer layer (13) to prevent corrosion of the surface of the metal layer (12) arranged along the width direction of the protective plate (1). In addition, the metal layer (12) is not arranged in the edge region in the width direction of the protective plate (1). In this embodiment, by defining the third distance and the fourth distance within this range, the structural strength of the edge region of the protective plate (1) is improved.

[0088] For example, the dimension of the first distance may be L*(3% to 5%)mm or L*(5% to 8%)mm, the dimension of the second distance may be L*(3% to 5%)mm or L*(5% to 8%)mm, the dimension of the third distance may be W*(2% to 10%)mm or W*(3% to 12%)mm, and the dimension of the fourth distance may be W*(2% to 10%)mm or W*(3% to 12%)mm.

[0089] In one embodiment, the first fiber-resin composite layer (11) comprises a fiber and a resin, wherein the fiber is at least one of carbon fiber, glass fiber and aramid fiber, and the resin is at least one of epoxy resin, phenolic resin, polypropylene resin and nylon resin.

[0090] In this embodiment, the type of fiber and the type of resin of the first fiber-resin composite layer (11) are specified 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.

[0091] In one embodiment, the buffer layer (13) has a honeycomb structure (19), wherein the hole size of the honeycomb structure (19) is in the range of 6 mm to 10 mm and the hole wall dimension of the honeycomb structure (19) is in the range of 0.3 mm to 0.8 mm; or the buffer layer (13) has a foam structure.

[0092] In this embodiment, the honeycomb structure (19) of the buffer layer is defined so that the buffer layer (13) can have better buffering and energy absorption performance, and in particular, the spatial size and hole wall dimensions of the honeycomb structure are defined.

[0093] Additionally, the cushioning layer (13) may be made of aluminum and the honeycomb structure may be formed on an aluminum plate; or the cushioning layer (13) may be made of polypropylene and the honeycomb structure may be formed on a polypropylene board (PP board) to improve the impact resistance of the protective plate (1) and improve the overall rigidity of the protective plate (1).

[0094] In an optional embodiment, the buffer layer (13) may have a foam structure so that the buffer layer (13) has the function of buffering and absorbing energy.

[0095] In a second embodiment of the present disclosure, a battery pack (2) is provided. The battery pack (2) includes a tray (21) and a protective plate according to the first embodiment, wherein the protective plate (1) is mounted on the tray (21).

[0096] In this embodiment, a battery pack (2) is provided. The battery pack (2) includes a protective plate (1) of the present disclosure. The protective plate (1) is mounted on a tray (21) of the battery pack (2). The protective plate (1) functions to protect the battery module (2), thereby improving the safety performance of the battery pack (2). As illustrated in FIG. 1, the battery pack (2) includes a sealing cover (23), a battery core (22), a tray (21), and a protective plate (1). The sealing cover (23) and the tray (21) define a space for accommodating the battery core (22). The protective plate (1) is arranged on the outside of the tray (21), and the protective plate (1) is connected to the bottom of the tray (21).

[0097] In a third aspect of the present disclosure, a vehicle comprising a battery pack (2) according to a second aspect is provided.

[0098] In this embodiment, a vehicle is provided that includes a battery pack (2) and a load connected to the battery pack. The load includes, but is not limited to, a converter and an air conditioner compressor. When the battery pack (2) is used in a vehicle, the safety of the battery pack (2) is ensured, and the safety of the vehicle during driving is improved.

[0099] In the above embodiments, the differences between the various embodiments are primarily described. Unless inconsistent, different optimal features of the various embodiments may be combined to form a more preferred embodiment, which will not be described in detail herein for the sake of brevity.

[0100] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art should understand that the foregoing examples are provided merely for illustrative purposes and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that modifications may be made to the foregoing embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims. Explanation of the symbols

[0101] 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. Recess; 18. Limit post; 19. Honeycomb structure; 20. Connecting hole; 2. Battery pack; 21. Tray; 22. Battery core; 23. Sealed cover.

Claims

Claim 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) sequentially stacked, wherein the protective plate (1) further comprises a second fiber-resin composite layer (14), wherein the second fiber-resin composite layer (14) is positioned on the side of the buffer layer (13) facing away from the metal layer (12). Claim 2 delete Claim 3 A protective plate (1) according to claim 1, wherein the thickness of the first fiber-resin composite layer (11) is in the range of 0.3 mm to 1.0 mm, the thickness of the metal layer (12) is in the range of 0.6 mm to 1.2 mm, the thickness of the buffer layer (13) is in the range of 6 mm to 12 mm, and the thickness of the second fiber-resin composite layer (14) is in the range of 0.5 mm to 1.0 mm. Claim 4 In claim 1, the thickness of the protective plate (1) is in the range of 7 mm to 15 mm. Claim 5 A protective plate (1), wherein, in claim 1, a first adhesive layer (15) is arranged between the first fiber-resin composite layer (11) and the metal layer (12), and the thickness of the first adhesive layer (15) is in the range of 0.1 mm to 0.3 mm; and / or a second adhesive layer (16) is arranged between the metal layer (12) and the buffer layer (13), and the thickness of the second adhesive layer (16) is in the range of 0.1 mm to 0.3 mm. Claim 6 A protective plate (1), wherein, in claim 1, 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 in the range of 0.1 mm to 0.3 mm. Claim 7 In claim 1, the buffer layer (13) and the metal layer (12) are connected by a molten component, and a connecting hole (20) is formed in the metal layer (12), and one end of the molten component is positioned in the connecting hole (20) and connected to the inner wall of the connecting hole (20), and the other end of the molten component is connected to the buffer layer (13); or a recess (17) facing the metal layer (12) is arranged on one side of the buffer layer (13), and the metal layer (12) is positioned within the recess (17), a protective plate (1). Claim 8 In claim 1, 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, and 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, the protective plate (1). Claim 9 In claim 8, 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, protective plate (1). Claim 10 In claim 8 or 9, the protective plate (1) further comprises a second fiber-resin composite layer (14), said second fiber-resin composite layer (14) arranged on the side of the buffer layer (13) facing away from the metal layer (12), said second fiber-resin composite layer (14) has a seventh dimension in the longitudinal direction of the protective plate (1), said seventh dimension being the same as said second dimension; and / or said second fiber-resin composite layer (14) has an eighth dimension in the width direction of the protective plate (1), said fifth dimension being the same as said eighth dimension, the protective plate (1). Claim 11 In claim 1, the protective plate (1) has a length dimension of L mm in the longitudinal direction of the protective plate (1), and a first distance is provided 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 is L * (3% to 8%) mm; a second distance is provided between the edge of the metal layer (12) and the edge of the buffer layer (13), the dimension of the second distance is L * (3% to 8%) mm; and / or the protective plate (1) has a width dimension of W mm in the width direction of the protective plate (1), and a third distance is provided 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% to 12%) mm; A protective plate (1), wherein a fourth distance is provided between the edge of the metal layer (12) and the edge of the buffer layer (13), and the dimension of the fourth distance is W*(2% to 12%)mm. Claim 12 In claim 1, the first fiber-resin composite layer (11) comprises fibers and resins, wherein the fibers are at least one of carbon fibers, glass fibers, and aramid fibers, and the resins are at least one of epoxy resin, phenolic resin, polypropylene resin, and nylon resin, a protective plate (1). Claim 13 In claim 1, the buffer layer (13) has a honeycomb structure (19), the hole size of the honeycomb structure (19) is in the range of 6 mm to 10 mm, and the hole wall dimension of the honeycomb structure (19) is in the range of 0.3 mm to 0.8 mm; or the buffer layer (13) has a foam structure, a protective plate (1). Claim 14 A battery pack (2) comprising a tray (21) and a protective plate (1) according to claim 1, wherein the protective plate (1) is mounted on the tray (21). Claim 15 A vehicle comprising a battery pack (2) according to claim 14 and a load connected to said battery pack (2).

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