Battery protection plate

Abstract

A battery protection plate, comprising a first continuous fiber reinforced resin layer, a fiber reinforced resin layer, and a second continuous fiber reinforced resin layer which are sequentially stacked. A metal plate and a foam layer are present between the first continuous fiber reinforced resin layer and the fiber reinforced resin layer; the fiber reinforced resin layer is a short fiber reinforced resin layer or a fiber mat reinforced resin layer; and the thickness ratio of the metal plate, the foam layer, and the fiber reinforced resin layer is (0.25-5):(0.6-8):(1-12). The fiber reinforced resin layer and the foam layer provided in the battery protection plate can achieve an excellent buffering and energy absorption effect, further improving the impact resistance of the battery protection plate. When the battery protection plate is in use, the applied stress can be evenly distributed, and no excessively high or low local impact force is caused, thereby preventing breakage or failure of the battery protection plate. In addition, the fiber reinforced resin layer and the foam layer can also achieve a weight reduction effect, thereby achieving a lightweight and high-strength technical effect.

Description

Battery protection plate Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a battery protection plate. Background Art

[0002] The protective plate is a supporting component of the power battery box of a new energy vehicle. It is installed on the lower part of the vehicle body and is used to protect the battery box from damage when it is hit or squeezed by the outside world. At present, the protective plates of automobiles are mainly made of metal or alloy materials, but the protective plates made of these materials are heavy, which will greatly reduce the battery's range; moreover, since the chassis (protective plate) is often in contact with rain, oil, etc., the metal parts are constantly corroded, which will bring safety hazards. In addition, the protective plate of the car can also be made of thermoplastic composite materials. However, the ductility of thermoplastic composite materials is poor, and they cannot protect the battery well when facing the impact of stones and sharp objects.

[0003] Patent CN217788632 U discloses a battery protection floor, comprising an upper fiber-reinforced resin layer, a metal plate, and a lower fiber-reinforced resin layer. This floor combines thermoplastic composites with metal materials, leveraging the advantages of each. Its application in electric vehicle battery vehicles represents an industry innovation, but its impact resistance still needs improvement.

[0004] Patent CN108545159A discloses a gradient pressure-resistant, impact-resistant, and energy-absorbing covering layer, comprising an energy-absorbing layer unit; the energy-absorbing layer unit comprises a rubber box body, a plastic foam energy absorber, and an intermediate panel. The covering layer end panels comprise a nylon composite layer with a thickness of 2 to 3 mm, the intermediate panel comprises a rubber skin with a thickness of 3 to 4 mm, and the plastic foam energy absorber comprises metal foam or polymer foam. This combination of materials achieves pressure-resistant, impact-resistant, and energy-absorbing properties, but fails to meet the requirements of lightweight design.

[0005] In view of this, this application is filed.

[0006] Utility Model Content

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a battery protection plate, which has the advantages of being lightweight, collision-resistant and impact-resistant.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A battery protection plate comprises a first continuous fiber reinforced resin layer, a fiber reinforced resin layer and a second continuous fiber reinforced resin layer stacked in sequence;

[0010] A metal plate and a foam layer are included between the first continuous fiber reinforced resin layer and the fiber reinforced resin layer;

[0011] The fiber-reinforced resin layer is a short fiber-reinforced resin layer or a fiber felt-reinforced resin layer;

[0012] The thickness ratio of the metal plate, the foam layer and the fiber-reinforced resin layer is (0.3-6): (0.6-8): (1-12).

[0013] Preferably, the thickness of the first continuous fiber reinforced resin layer is 0.1 to 1.5 mm.

[0014] Preferably, the thickness of the second continuous fiber reinforced resin layer is 0.1 to 1.5 mm.

[0015] Preferably, the fiber reinforced resin layer has a thickness of 1 to 12 mm and a gram weight of 400 to 1600 g / m 2 .

[0016] Preferably, the length of the short fibers in the short fiber reinforced resin layer is 10 to 70 mm.

[0017] Preferably, the thickness of the foam layer is 0.8 to 6 mm.

[0018] Preferably, the fiber-reinforced resin layer is made of glass mat reinforced thermoplastics (GMT).

[0019] Preferably, the metal plate is adjacent to the first continuous fiber reinforced resin layer, and the foam layer is adjacent to the fiber reinforced resin layer.

[0020] Preferably, the metal plate is adjacent to the fiber-reinforced resin layer, and the foam layer is adjacent to the first continuous fiber-reinforced resin layer.

[0021] Preferably, the metal plate includes a substrate and a coating located on at least one surface of the substrate; the substrate is selected from any one or more of iron, iron alloy, aluminum, aluminum alloy, magnesium, magnesium alloy, copper, copper alloy, titanium, titanium alloy, nickel and nickel alloy, and the coating is a zinc coating, a zinc-iron alloy coating or a zinc-magnesium alloy coating.

[0022] Preferably, the thickness of the substrate is 0.25-5 mm, and the surface roughness Ra of the substrate is 0.3-1.2 μm.

[0023] Preferably, the thickness of the coating is 0.05 to 0.5 mm.

[0024] Preferably, a resin film is provided between the second continuous fiber reinforced resin layer and the fiber reinforced resin layer, and the thickness of the resin film is 0.08 to 1 mm.

[0025] Preferably, the battery protection plate further includes a buffer layer, the material of the buffer layer is a rubber polymer, a thermoplastic elastomer or a resin polymer, and the buffer layer is arranged on the side of the first continuous fiber reinforced resin layer away from the metal plate.

[0026] Preferably, the buffer layer is made of thermoplastic vulcanizate (TPV).

[0027] Preferably, the thickness of the buffer layer is 0.4 to 2.5 mm.

[0028] Preferably, the total thickness of the battery protection plate is 2.1 to 33.6 mm.

[0029] The beneficial effects of the present invention are as follows: (1) The present invention uses the first continuous fiber reinforced resin layer and the second continuous fiber reinforced resin layer as the upper and lower layers (i.e., inner and outer protective layers) of the battery protective plate, respectively, which can not only effectively improve the impact resistance and corrosion resistance of the battery protective plate, but also effectively reduce weight, thereby achieving the technical effect of light weight and high strength, and avoiding the bottom of the battery protective plate from being penetrated; the metal plate arranged between the first continuous fiber reinforced resin layer and the fiber reinforced resin layer further enhances the rigidity and strength of the battery protective plate, thereby further improving the impact resistance of the protective plate. (2) The fiber reinforced resin layer, foam layer and metal plate arranged in the present invention can play an excellent buffering and energy absorption role, further improving the impact resistance of the protective plate. When the battery protective plate is used, the stress it is subjected to can be evenly dispersed, and will not cause local impact force to be too high or local impact force to be too low, thereby preventing the protective plate from breaking and failing. Moreover, the fiber reinforced resin layer and foam layer can hinder air circulation, achieving an excellent noise reduction effect. In addition, the fiber reinforced resin layer and foam layer can also play a weight reduction effect, achieving the technical effect of light weight and high strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a schematic structural diagram of an embodiment of a battery protection plate of the present invention.

[0031] FIG2 is a schematic structural diagram of another embodiment of a battery protection plate of the present invention.

[0032] FIG3 is a schematic structural diagram of the metal plate in the battery protection plate of the present invention.

[0033] FIG4 is another schematic diagram of the structure of the metal plate in the battery protection plate of the present invention.

[0034] FIG5 is another structural schematic diagram of the metal plate in the battery protection plate of the present invention.

[0035] FIG6 is a schematic structural diagram of another embodiment of a battery protection plate of the present invention.

[0036] FIG7 is a schematic structural diagram of another embodiment of a battery protection plate of the present invention.

[0037] FIG8 is a schematic structural diagram of another embodiment of a battery protection plate of the present invention.

[0038] Markings in the figure: 1. first continuous fiber reinforced resin layer; 2. metal plate; 21. substrate; 22. coating; 3. foam layer; 4. fiber reinforced resin layer; 5. second continuous fiber reinforced resin layer; 6. resin film; 7. buffer layer. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] In this application, when referring to a numerical interval, unless otherwise specified, the numerical interval is a continuous interval, including the minimum and maximum values ​​at both ends of the numerical interval and every value between the minimum and the maximum value. Furthermore, when the numerical interval represents an integer, it includes every integer between the minimum and the maximum value of the numerical interval. In addition, when a feature or characteristic is described in multiple numerical intervals, the multiple numerical intervals can be combined. In other words, unless otherwise specified, the ranges of all numerical intervals disclosed herein should be understood to include any and all subranges therein.

[0041] Unless otherwise specified, the components or raw materials used in the examples and comparative examples of the present invention are all commercially available raw materials, and the components or raw materials used in each parallel experiment are all of the same kind.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0043] Referring to FIG1 , the present invention provides a battery protection plate, comprising a first continuous fiber-reinforced resin layer 1, a fiber-reinforced resin layer 4, and a second continuous fiber-reinforced resin layer 5 stacked in sequence;

[0044] A metal plate 2 and a foam layer 3 are included between the first continuous fiber reinforced resin layer 1 and the fiber reinforced resin layer 4;

[0045] The fiber-reinforced resin layer 4 is a short fiber-reinforced resin layer or a fiber felt-reinforced resin layer;

[0046] The thickness ratio of the metal plate 2, the foam layer 3, and the fiber-reinforced resin layer 4 is (0.3-6): (0.6-8): (1-12).

[0047] The present invention uses the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 as the upper and lower layers (i.e., inner and outer protective layers) of the battery protective plate, respectively, which can not only effectively improve the impact resistance and corrosion resistance of the battery protective plate, but also effectively reduce the weight, thereby achieving the technical effect of light weight and high strength, and avoiding the bottom of the battery protective plate from being penetrated; the metal plate 2 arranged between the first continuous fiber reinforced resin layer and the fiber reinforced resin layer further enhances the rigidity and strength of the protective plate, thereby further improving the impact resistance of the protective plate.

[0048] The present invention creatively arranges a continuous fiber reinforced resin layer 4, a foam layer 3 and a metal plate 2, and controls the thickness ratio of the continuous fiber reinforced resin layer 4, the foam layer 3 and the metal plate 2, which can play an excellent role in buffering and absorbing energy, further improving the impact resistance of the protective plate. When the battery protective plate is used, the stress it is subjected to can be evenly dispersed, and will not cause the local impact force to be too high or the local impact force to be too low, thereby preventing the protective plate from breaking and failing. Moreover, the fiber reinforced resin layer 4 and the foam layer 3 can hinder air circulation, achieving an excellent noise reduction effect. In addition, the fiber reinforced resin layer 4 and the foam layer 3 can also achieve the effect of weight reduction, achieving the technical effect of light weight and high strength.

[0049] In one embodiment, the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 are both composited by continuous fibers and resin through a melt impregnation process, wherein the mass percentage of the continuous fibers in the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 is 30-80%, for example, it can be 30%, 35%, 40%, 50%, 60%, 70%, 75%, 80%, or a range consisting of any two values ​​therein. Preferably, the mass percentage of the continuous fibers in the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 is 35-75%. By limiting the content of the fiber material and the resin in the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5, the present invention makes the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 have the advantages of being lightweight, collision-resistant, and impact-resistant.

[0050] In one embodiment, the thickness of the first continuous fiber reinforced resin layer 1 is 0.1 to 1.5 mm, for example, it can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm or a range consisting of any two of these values.

[0051] In one embodiment, the thickness of the first continuous fiber reinforced resin layer 1 is 0.15 to 1.2 mm. In one embodiment, the width of the first continuous fiber reinforced resin layer 1 is tailored according to actual product requirements. Preferably, the width of the first continuous fiber reinforced resin layer 1 is 20 to 1500 mm, for example, it can be 20 mm, 25 mm, 30 mm, 50 mm, 100 mm, 200 mm, 400 mm, 800 mm, 1000 mm, 1200 mm, 1400 mm, 1470 mm, 1500 mm, or a range consisting of any two values ​​therein. In one embodiment, the width of the first continuous fiber reinforced resin layer 1 is 25 to 1470 mm.

[0052] In one embodiment, the thickness of the second continuous fiber reinforced resin layer 5 is 0.1 to 1.5 mm, for example, it can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm or a range consisting of any two of these values.

[0053] In one embodiment, the thickness of the first continuous fiber reinforced resin layer 1 is 0.15-1.2 mm.

[0054] In one embodiment, the width of the second continuous fiber-reinforced resin layer 5 is tailored according to actual product requirements. Preferably, the width of the second continuous fiber-reinforced resin layer 5 is 20 to 1500 mm, for example, 20 mm, 25 mm, 30 mm, 50 mm, 100 mm, 200 mm, 400 mm, 800 mm, 1000 mm, 1200 mm, 1400 mm, 1470 mm, 1500 mm, or a range consisting of any two of these values.

[0055] In one embodiment, the width of the second continuous fiber reinforced resin layer 5 is 25 to 1470 mm.

[0056] The present invention controls the thickness and width of the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 so that the battery protection plate not only has excellent anti-collision and impact resistance but also has the advantage of being lightweight.

[0057] In one embodiment, the resins in the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 are independently any one of modified or unmodified polyethylene, modified or unmodified polypropylene, modified or unmodified polystyrene, modified or unmodified polycarbonate, modified or unmodified polyamide, modified or unmodified polyethylene recycled material, modified or unmodified polypropylene recycled material, modified or unmodified polystyrene recycled material, modified or unmodified polycarbonate recycled material, and modified or unmodified polyamide recycled material.

[0058] In one embodiment, the continuous fibers in the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 are independently continuous glass fibers, continuous carbon fibers, continuous aramid fibers, continuous basalt fibers or continuous silicon carbide fibers.

[0059] In one embodiment, the types of resin and continuous fibers in the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 may be the same or different.

[0060] In one embodiment, the first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 are made of the same resin material. The first continuous fiber reinforced resin layer 1 and the second continuous fiber reinforced resin layer 5 use the same resin material, which can effectively improve the overall compatibility and further improve the impact resistance of the battery protection plate.

[0061] In one embodiment, the fiber reinforced resin layer 4 has a thickness of 1 to 12 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 12 mm or a range consisting of any two values ​​therein.

[0062] In one embodiment, the fiber-reinforced resin layer 4 has a thickness of 2 to 10 mm.

[0063] In one embodiment, the fiber reinforced resin layer 4 has a gram weight of 400 to 1600 g / m 2 , for example, it can be 400g / m 2 , 500g / m 2 , 600g / m 2 , 800g / m 2 , 1000g / m 2 , 1200g / m 2 , 1400g / m 2 , 1500g / m 2 , 1600g / m 2 Or a range consisting of any two values.

[0064] When the fiber-reinforced resin layer 4 has such a weight and thickness, it can provide excellent energy-absorbing performance, thereby further improving the impact resistance of the battery protection plate. When the battery protection plate is used, the stress it is subjected to can be evenly distributed, preventing localized excessive or insufficient impact forces, thereby preventing the battery protection plate from breaking or failing.

[0065] In one embodiment, the resins in the fiber-reinforced resin layer 4 and the second continuous fiber-reinforced resin layer 5 may be the same resin material or different resin materials.

[0066] In one embodiment, the fiber-reinforced resin layer 4 and the second continuous fiber-reinforced resin layer 5 are made of the same resin material. Using the same resin material for the fiber-reinforced resin layer 4 and the second continuous fiber-reinforced resin layer 5 can effectively improve overall compatibility and further enhance the impact resistance of the battery shield.

[0067] In one embodiment, the short fiber reinforced resin layer is composed of short fibers and resin, wherein the mass percentage of short fibers in the short fiber reinforced resin layer is 30 to 60%, for example, it can be 30%, 40%, 50%, 60% or a range consisting of any two values ​​therein.

[0068] In one embodiment, the length of the short fibers in the short fiber reinforced resin layer is 10 to 70 mm, for example, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm or a range consisting of any two values ​​therein.

[0069] In one embodiment, the short fibers in the short fiber reinforced resin layer are short glass fibers.

[0070] The molding process of the short fiber reinforced resin layer includes the following steps: preparing two layers of resin films, evenly placing short fibers between the two layers of resin films, and performing hot pressing and composite molding by a molding machine to obtain the short fiber reinforced resin layer.

[0071] In one embodiment, the resin in the short fiber reinforced resin layer is any one of modified or unmodified polyethylene, modified or unmodified polypropylene, modified or unmodified polystyrene, modified or unmodified polycarbonate, modified or unmodified polyamide, modified or unmodified polyethylene recycled material, modified or unmodified polypropylene recycled material, modified or unmodified polystyrene recycled material, modified or unmodified polycarbonate recycled material, and modified or unmodified polyamide recycled material.

[0072] In one embodiment, the fiber felt reinforced resin layer is composed of fiber felt and resin, wherein the mass percentage of the fiber felt in the fiber felt reinforced resin layer is 30 to 60%, for example, it can be 30%, 40%, 50%, 60%, 70% or a range consisting of any two of these values.

[0073] In one embodiment, the fiber mat in the fiber mat reinforced resin layer is glass fiber mat, carbon fiber mat or basalt fiber mat.

[0074] The molding process of the fiber mat reinforced resin layer comprises the following steps: preparing two layers of resin films, evenly placing the fiber mat between the two layers of resin films, and performing hot pressing and composite molding by a molding machine to obtain a short fiber reinforced resin layer.

[0075] In one embodiment, the resin in the fiber felt reinforced resin layer is any one of modified or unmodified polyethylene, modified or unmodified polypropylene, modified or unmodified polystyrene, modified or unmodified polycarbonate, modified or unmodified polyamide, modified or unmodified polyethylene recycled material, modified or unmodified polypropylene recycled material, modified or unmodified polystyrene recycled material, modified or unmodified polycarbonate recycled material, and modified or unmodified polyamide recycled material.

[0076] The present invention limits the content of fiber material and resin in the fiber-reinforced resin layer 4, so that the fiber-reinforced resin layer 4 has the advantages of being lightweight, collision-resistant and impact-resistant.

[0077] In one embodiment, the foam layer has a thickness of 0.8 to 6 mm, for example, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or a range consisting of any two values ​​thereof.

[0078] In one embodiment, the thickness of the foam layer is 1 to 5 mm, which ensures the cushioning performance of the foam layer while not affecting the assembly of the battery protection plate due to the excessive thickness of the foam layer.

[0079] In one embodiment, the foam layer is made of polyethylene foam plastic, polystyrene foam plastic, polyurethane foam plastic, polyvinyl chloride foam material or polyethylene terephthalate foam material.

[0080] In one embodiment, the fiber-reinforced resin layer is made of GMT material.

[0081] The GMT material is a composite material with a thermoplastic resin as its matrix and glass fiber mat or glass fiber as its reinforcing framework. The GMT material can replace traditional metal components, thereby reducing vehicle weight and lowering costs. The GMT material also enables the battery shield to be lightweight, collision-resistant, and impact-resistant, as the GMT material can evenly transfer and distribute the stress applied to the battery shield. In one embodiment, the mass percentage of the glass fiber mat or glass fiber in the GMT material is 30% to 60%, for example, 30%, 40%, 50%, 60%, 70%, or a range consisting of any two of these values.

[0082] In one embodiment, the thermoplastic resin in the GMT material is any one of modified or unmodified polyethylene, modified or unmodified polypropylene, modified or unmodified polystyrene, modified or unmodified polycarbonate, modified or unmodified polyamide, modified or unmodified polyethylene recycled material, modified or unmodified polypropylene recycled material, modified or unmodified polystyrene recycled material, modified or unmodified polycarbonate recycled material, and modified or unmodified polyamide recycled material.

[0083] In one embodiment, the length of the glass fiber in the GMT material is 10-70 mm, for example, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, or a range consisting of any two values ​​therein.

[0084] In one embodiment, as shown in FIG. 1 , the metal plate 2 is adjacent to the first continuous fiber reinforced resin layer 1 , and the foam layer 3 is adjacent to the fiber reinforced resin layer 4 .

[0085] In one embodiment, as shown in FIG. 2 , the metal plate 2 is adjacent to the fiber-reinforced resin layer 4 , and the foam layer 3 is adjacent to the first continuous fiber-reinforced resin layer 1 .

[0086] The structure of the battery protection plate shown in Figures 1 and 2 shows that in the present invention, the positional relationship between the metal plate 2 and the foam layer 3 can be interchangeable, that is, the metal plate 2 can be located above the foam layer 3 or below the foam layer 3.

[0087] The features of the present invention will be further described below with the metal plate 2 being located below the foam layer 3 .

[0088] Please refer to Figures 3 to 5 , the metal plate 2 includes a substrate 21 and a coating 22 located on at least one surface of the substrate; the substrate 21 is selected from any one or more of iron, iron alloy, aluminum, aluminum alloy, magnesium, magnesium alloy, copper, copper alloy, titanium, titanium alloy, nickel and nickel alloy, and the coating 22 is a zinc coating, a zinc-iron alloy coating or a zinc-magnesium alloy coating.

[0089] It should be noted that the substrate 21 includes two opposing surfaces in the thickness direction, namely a first surface and a second surface, and the coating 22 is provided on at least one surface of the substrate 21. It should be understood by those skilled in the art that the coating 22 can be provided on the first surface, the second surface, or both, and can be selected based on actual needs. It should be noted that the aforementioned "surface" can be the entire area of ​​the first surface and / or the second surface, or a partial area of ​​the first surface and / or the second surface. This application does not specifically limit this, as long as the purpose of this application can be achieved.

[0090] In one embodiment, the substrate 21 is a steel plate, a steel strip or an aluminum plate.

[0091] In one embodiment, the mass percentage of zinc in the coating 22 is 10-100%, for example, it can be 10%, 20%, 50%, 80%, 100% or a range consisting of any two values ​​therein.

[0092] In one embodiment, the thickness of the substrate 21 is 0.25-5 mm, for example, 0.25 mm, 0.28 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, or a range consisting of any two values ​​therein.

[0093] In one embodiment, the thickness of the substrate 21 is 0.28-4 mm.

[0094] In one embodiment, the surface roughness Ra of the substrate 21 is 0.3-1.2 μm, for example, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1.0 μm, 1.1 μm, 1.2 μm or a range consisting of any two of these values.

[0095] In one embodiment, the mass percentage of zinc in the zinc-iron alloy coating and / or the zinc-magnesium alloy coating is 10% to 90%, for example, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or a range consisting of any two values ​​therein.

[0096] In one embodiment, the thickness of the coating 22 is 0.05-0.5 mm, for example, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or a range consisting of any two values ​​thereof.

[0097] In one embodiment, the steel plate or steel strip has a yield strength of 100 MPa to 1200 MPa, a tensile strength of 200 MPa to 1400 MPa, and an elongation at break of 1% to 40%.

[0098] The battery protection plate adopts the metal plate 2 of the above structure, which further enhances the rigidity and strength of the battery protection plate, thereby further improving the impact resistance of the battery protection plate. Moreover, the metal plate 2 can achieve excellent buffering and noise reduction effects.

[0099] Referring to Figure 6 , in one embodiment, a resin film 6 is provided between the second continuous fiber-reinforced resin layer 5 and the fiber-reinforced resin layer 4. The thickness of the resin film 6 is 0.08 to 1 mm, for example, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, or a range consisting of any two of these values. Providing the resin film 6 between the second continuous fiber-reinforced resin layer 5 and the fiber-reinforced resin layer 4 effectively improves the adhesion between the fiber-reinforced resin layer 4 and the second continuous fiber-reinforced resin layer 5.

[0100] In one embodiment, the resin of the resin film 6 is any one of modified or unmodified polyethylene, modified or unmodified polypropylene, modified or unmodified polystyrene, modified or unmodified polycarbonate, modified or unmodified polyamide, modified or unmodified polyethylene recycled material, modified or unmodified polypropylene recycled material, modified or unmodified polystyrene recycled material, modified or unmodified polycarbonate recycled material, and modified or unmodified polyamide recycled material.

[0101] In one embodiment, the resin of the resin film 6 may be the same as or different from the resin of the fiber-reinforced resin layer 4 and the second continuous fiber-reinforced resin layer 5 .

[0102] In one embodiment, the resin film 6, the fiber-reinforced resin layer 4, and the second continuous fiber-reinforced resin layer 5 are made of the same resin. Using the same resin for the resin film 6, the fiber-reinforced resin layer 4, and the second continuous fiber-reinforced resin layer 5 can effectively improve overall compatibility and further enhance the impact resistance of the battery shield.

[0103] As shown in Figure 7, based on the battery protection plate shown in Figure 1, the battery protection plate can also include a buffer layer 7, the material of the buffer layer 7 is a rubber polymer, a thermoplastic elastomer or a resin polymer, and the buffer layer 7 is arranged on the side of the first continuous fiber reinforced resin layer 1 away from the metal plate 2.

[0104] As shown in Figure 8, based on the battery protection plate shown in Figure 6, the battery protection plate can also include a buffer layer 7, the material of the buffer layer 7 is a rubber polymer, a thermoplastic elastomer or a resin polymer, and the buffer layer 7 is arranged on the side of the first continuous fiber reinforced resin layer 1 away from the metal plate 2.

[0105] When the battery protection plate is subjected to external forces, the buffer layer 7 absorbs energy by deforming and rupturing, thereby achieving better stress transfer. Furthermore, the buffer layer 7 not only effectively protects the first continuous fiber-reinforced resin layer 1, effectively improving the battery protection plate's impact and corrosion resistance, but also effectively reduces weight, achieving a lightweight and high-strength technical effect, and preventing the bottom of the battery protection plate from being penetrated.

[0106] In one embodiment, the rubber polymer is styrene-butadiene rubber, nitrile rubber, chlorinated nitrile rubber, polybutadiene rubber, chloroprene rubber, butyl rubber, isoprene rubber, acrylic rubber, fluororubber, EPDM rubber, EPDM rubber, chlorosulfonated polyethylene rubber, thermoplastic vulcanizate or polyester rubber.

[0107] In one embodiment, the thermoplastic elastomer is a styrene-butylene-styrene block copolymer, a hydrogenated styrene-butylene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, or a hydrogenated ethylene-isoprene-styrene block copolymer.

[0108] In one embodiment, the resin polymer is polyethylene-olefin copolymer, polyurethane, silicone, polystyrene, polyvinylidene fluoride, polyvinyl fluoride, polytetrafluoroethylene, polychlorotrifluoroethylene, polyhexafluoropropylene, polyperfluoroethylene propylene, polyhexafluoropropylene, poly(vinylidene fluoride-hexafluoropropylene), polyethylene, polypropylene, polyvinyl alcohol, polyvinyl butyral, polybutene, polyisobutylene, polyisoprene, polyphenylene ether, polyvinyl chloride or ethylene vinyl acetate.

[0109] In one embodiment, the buffer layer is made of TPV material.

[0110] It should be noted that the TPV material is composed of a blend of PP resin and vulcanized rubber particles, where the rubber particles range in size from 1 to 70 microns, the hardness of the TPV material ranges from 50 to 85A, and the thickness of the buffer layer ranges from 0.4 to 2.5 mm. To achieve a gradient buffering effect, TPV single-layer sheets of varying hardness can be combined to form multiple interfaces.

[0111] In one embodiment, the thickness of the buffer layer 7 is 0.4-2.5 mm, for example, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, or a range consisting of any two values ​​therein.

[0112] In one embodiment, the buffer layer 7 has a thickness of 0.5 to 2 mm.

[0113] In one embodiment, each layer of the battery protection plate is formed by hot pressing.

[0114] The following examples are provided to facilitate understanding of the present invention. These examples are not provided to limit the scope of the claims.

[0115] Example 1-8 to Comparative Example 1-4

[0116] The structural layers and thicknesses of the battery protection plates of Examples 1-8 and Comparative Examples 1-4 are shown in Table 1, respectively.

[0117] The structural diagram of the battery protection plate of Examples 1 to 4 is shown in FIG1 .

[0118] The structural diagram of the battery protection plate of Example 5 is shown in FIG6 .

[0119] The structural diagram of the battery protection plate of Examples 6 to 8 is shown in FIG7 .

[0120] The only difference between Comparative Example 1 and Example 1 is that the foam layer 3 and the fiber-reinforced resin layer 4 are not provided in the battery protection plate.

[0121] The only difference between Comparative Example 2 and Example 1 is that the foam layer 3 is not provided in the battery protection plate.

[0122] The only difference between Comparative Example 3 and Example 1 is that the fiber-reinforced resin layer 4 is not provided in the battery protection plate.

[0123] The only difference between Comparative Example 4 and Example 6 is that the foam layer 3, the fiber-reinforced resin layer 4, and the resin film 6 are not provided in the battery protection plate.

[0124] The only difference between Examples 1-8 and Comparative Examples 1-4 is that the thickness of each layer in the battery protection plate is different, while the types and proportions of materials used in each layer are the same.

[0125] The first continuous fiber reinforced resin layer 1 in the battery protection plates of Examples 1 to 8 and Comparative Examples 1 to 4 is continuous glass fiber reinforced polypropylene, and the mass percentage of continuous glass fiber in the continuous glass fiber reinforced polypropylene layer is 65 wt.%.

[0126] The base plates of the metal plates 2 in the battery protection plates of Examples 1 to 8 and Comparative Examples 1 to 4 are all steel plates, and the coatings are all zinc coatings.

[0127] The material of the foam layer 3 in the battery protection plates of Examples 1 to 8 and Comparative Example 3 is polyurethane foam plastic.

[0128] The fiber-reinforced resin layer 4 in the battery protection plates of Examples 1 to 8 and Comparative Example 2 is made of GMT material. The mass percentage of the glass fiber in the GMT material is 40%, and the length of the glass fiber in the GMT is 40 mm.

[0129] The second continuous fiber reinforced resin layer 5 in the battery protection plates of Examples 1 to 8 and Comparative Examples 1 to 5 is all made of continuous glass fiber reinforced polypropylene, and the mass percentage of the continuous glass fiber in the continuous glass fiber reinforced polypropylene is 65 wt.%.

[0130] The resin films 6 in the battery protection plates of Examples 5 to 8 were all made of polypropylene.

[0131] The buffer layers 7 in the battery protection plates of Examples 6 to 8 and Comparative Example 4 are all made of TPV material.

[0132] Table 1 Structural layers and thicknesses of battery protection plates of Examples 1-8 and Comparative Examples 1-4

[0133] Performance Testing

[0134] Referring to ASTM D7136 "Standard Test Method for Damage Resistance of Fiber-Reinforced Polymer Composites to Drop Hammer Impact Events", the drop hammer impact force E of the battery protection plates of Examples 1-8 and Comparative Examples 1-4 was tested. The diameter of the impact head was 16 mm, and the drop hammer impact force E was calculated according to the formula E = H * m * g, where H is the drop height of the impact head, m is the weight of the impact head, m = 30 kg, and g is the acceleration due to gravity, g = 9.8 m / s 2 , the test results are shown in Table 2.

[0135] Table 2 Drop hammer impact force E of battery protection plates of Examples 1-8 and Comparative Examples 1-4

[0136] As can be seen from Table 1, the present invention effectively improves the impact resistance of the battery protection plate by providing a continuous fiber reinforced resin layer 4, a foam layer 3 and a metal plate 2, and further improves the impact resistance of the battery protection plate by providing a buffer layer 7.

[0137] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A battery protection plate, characterized in that: It comprises a first continuous fiber reinforced resin layer, a fiber reinforced resin layer and a second continuous fiber reinforced resin layer which are stacked in sequence; A metal plate and a foam layer are included between the first continuous fiber reinforced resin layer and the fiber reinforced resin layer; The fiber-reinforced resin layer is a short fiber-reinforced resin layer or a fiber felt-reinforced resin layer; The thickness ratio of the metal plate, the foam layer and the fiber-reinforced resin layer is (0.3-6): (0.6-8): (1-12).

2. The battery protection plate according to claim 1, characterized in that: The thickness of the first continuous fiber reinforced resin layer is 0.1 to 1.5 mm; and / or The thickness of the second continuous fiber reinforced resin layer is 0.1 to 1.5 mm.

3. The battery protection plate according to claim 1, characterized in that: The fiber-reinforced resin layer has a thickness of 1 to 12 mm and a gram weight of 400 to 1600 g / m 2 and / or The length of the short fibers in the short fiber reinforced resin layer is 10 to 70 mm; and / or The thickness of the foam layer is 0.8-6 mm.

4. The battery protection plate according to claim 1, characterized in that: The fiber-reinforced resin layer is made of GMT material.

5. The battery protection plate according to claim 1, characterized in that: The metal plate is adjacent to the first continuous fiber reinforced resin layer, and the foam layer is adjacent to the fiber reinforced resin layer; or The metal plate is adjacent to the fiber-reinforced resin layer, and the foam layer is adjacent to the first continuous fiber-reinforced resin layer.

6. The battery protection plate according to claim 1, characterized in that: The metal plate includes a substrate and a coating located on at least one surface of the substrate; the substrate is selected from any one or more of iron, iron alloy, aluminum, aluminum alloy, magnesium, magnesium alloy, copper, copper alloy, titanium, titanium alloy, and nickel-nickel alloy, and the coating is a zinc coating, a zinc-iron alloy coating, or a zinc-magnesium alloy coating.

7. The battery protection plate according to claim 6, characterized in that: The thickness of the substrate is 0.25 to 5 mm, and the roughness Ra of the substrate surface is 0.3 to 1.2 μm; and / or The thickness of the coating is 0.05 to 0.5 mm.

8. The battery protection plate according to claim 1, characterized in that: A resin film is provided between the second continuous fiber reinforced resin layer and the fiber reinforced resin layer, and the thickness of the resin film is 0.08 to 1.0 mm.

9. The battery protection plate according to claim 1, characterized in that: The battery protection plate further includes a buffer layer, the material of the buffer layer is a rubber polymer, a thermoplastic elastomer or a resin polymer, and the buffer layer is arranged on a side of the first continuous fiber reinforced resin layer away from the metal plate.

10. The battery protection plate according to claim 9, characterized in that: The buffer layer is made of TPV material.

Images