Protective plate and new energy battery pack

Abstract

The utility model relates to a protection plate and a new energy battery pack, and belongs to the technical field of new energy. The protection plate comprises a first surface layer, a metal layer, a fiber felt and a second surface layer which are sequentially arranged, the first surface layer comprises a first fiber reinforced resin layer and a second fiber reinforced resin layer which are sequentially arranged, and the first fiber reinforced resin layer comprises N1 layers of continuous fiber reinforced resin sheets which are sequentially stacked in the thickness direction of the first fiber reinforced resin layer; the second fiber reinforced resin layer comprises N2 layers of continuous fiber reinforced resin sheets which are sequentially stacked in the thickness direction of the second fiber reinforced resin layer, and N1 and N2 are independently integers not less than 1. According to the utility model, the first surface layer, the fiber felt, the metal layer and the second surface layer are stacked in sequence, so that the protection plate is lighter than an existing metal protection plate with a single structure, has the advantages of high rigidity, impact resistance, high energy absorption and high plasticity, and can effectively protect the new energy battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a protective plate and a new energy battery pack. Background Art

[0002] New energy vehicles integrate the research and development of advanced materials and the manufacturing of high-precision parts. As the core part of new energy vehicles, new energy batteries need to develop in the direction of higher performance, higher safety and more environmental protection. The battery pack of existing new energy vehicles is set on the frame through a tray. In order to improve the safety performance of the battery pack, a protective plate is usually set on the tray. However, the protective plates commonly used in the prior art have the defects of unreasonable structural design and poor protection effect. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a protective plate for a new energy battery pack, and a new energy battery pack.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] In a first aspect, the utility model provides a protective plate, comprising a first surface layer, a metal layer, a fiber felt and a second surface layer arranged in sequence, the first surface layer comprising a first fiber-reinforced resin layer and a second fiber-reinforced resin layer arranged in sequence, the first fiber-reinforced resin layer comprising N1 layers of continuous fiber-reinforced resin sheets sequentially stacked along its thickness direction, the second fiber-reinforced resin layer comprising N2 layers of continuous fiber-reinforced resin sheets sequentially stacked along its thickness direction, N1 and N2 are each independently an integer not less than 1, and the ply structure of the continuous fiber-reinforced resin sheets in the first fiber-reinforced resin layer is symmetrical to the ply structure of the continuous fiber-reinforced resin sheets in the second fiber-reinforced resin layer;

[0006] The first surface layer further includes a third fiber-reinforced resin layer, the third fiber-reinforced resin layer is disposed between the first fiber-reinforced resin layer and the second fiber-reinforced resin layer, the third fiber-reinforced resin layer includes N3 layers of continuous fiber-reinforced resin sheets sequentially stacked along the thickness direction thereof, N3 being an integer not less than 1;

[0007] The second surface layer has the same structure as the first surface layer and is symmetrically arranged.

[0008] The utility model stacks the first surface layer, the metal layer and the fiber felt in sequence, which not only makes the protective plate lighter than the existing single-structure metal protective plate, but also has the advantages of high rigidity, impact resistance, high energy absorption and high plasticity, and can effectively protect the new energy battery pack.

[0009] As a preferred embodiment of the present utility model, N3 is an integer not less than 2, the xth layer of continuous fiber reinforced resin sheet and the N3-x+1th layer of continuous fiber reinforced resin sheet in the third fiber reinforced resin layer are symmetrically layered, x is an integer, and 1≤x≤N3 / 2; the N3 layers of continuous fiber reinforced resin sheets in the third fiber reinforced resin layer are symmetrically layered from the middle to both sides.

[0010] As a preferred embodiment of the present invention, the thickness of the continuous fiber reinforced resin sheet is 0.15 to 0.5 mm.

[0011] As a preferred embodiment of the present invention, in the first surface layer, the total number of layers of the continuous fiber reinforced resin sheet is 5 to 20 layers.

[0012] As a preferred embodiment of the present utility model, the first surface layer and the metal layer are connected by a first adhesive film, and the thickness of the first adhesive film is 0.05-0.5 mm.

[0013] As a preferred embodiment of the present invention, the fiber felt and the metal layer are connected via a second adhesive film, and the thickness of the second adhesive film is 0.05-0.5 mm.

[0014] As a preferred embodiment of the utility model, a first functional layer is provided on the side of the first surface layer away from the metal layer, and the first functional layer is a film layer or a non-woven fabric layer; the thickness of the first functional layer is 0.05-0.5 mm.

[0015] As a preferred embodiment of the present utility model, the second surface layer is connected to the fiber felt via a third adhesive film, and the thickness of the third adhesive film is 0.05-0.5 mm.

[0016] Furthermore, a second functional layer is provided on the side of the second surface layer facing away from the fiber felt, and the second functional layer is a film layer or a non-woven fabric layer; the thickness of the second functional layer is 0.05-0.5 mm.

[0017] As a preferred embodiment of the present invention, the thickness of the fiber felt is 1 to 10 mm.

[0018] As a preferred embodiment of the present invention, the thickness of the metal layer is 0.5 to 2 mm.

[0019] In a second aspect, the utility model provides a new energy battery pack, comprising a tray and the protective plate as described in the first aspect, wherein the protective plate is arranged on the tray.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The protective plate provided by the utility model has a reasonable structural design, and the first surface layer, fiber felt, metal layer and second surface layer are arranged in sequence, which not only makes the protective plate lighter than the existing single-structure metal protective plate, but also has the advantages of high rigidity, impact resistance, high energy absorption and high plasticity, and can effectively protect the new energy battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a protective plate provided in one embodiment of the utility model;

[0023] Figure 2 A schematic diagram of the structure of the first surface layer provided in one embodiment of the utility model;

[0024] Figure 3 A schematic structural diagram of a protective plate provided in another embodiment of the utility model.

[0025] In the figure, 1-first surface layer, 11-first fiber reinforced resin layer, 12-second fiber reinforced resin layer, 13-third fiber reinforced resin layer, 2-metal layer, 3-fiber felt, 4-second surface layer, 5-first adhesive film, 6-second adhesive film, 7-third adhesive film, 8-first functional layer, 9-second functional layer. DETAILED DESCRIPTION

[0026] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0027] like Figures 1-2 As shown, the utility model provides a protective plate, comprising a first surface layer 1, a metal layer 2, a fiber felt 3 and a second surface layer 4 stacked in sequence; the second surface layer 4 has the same structure as the first surface layer 1 and is symmetrically arranged.

[0028] The first surface layer 1 includes a first fiber reinforced resin layer 11 and a second fiber reinforced resin layer 12 which are arranged in sequence, the second fiber reinforced resin layer 12 is arranged between the first fiber reinforced resin layer 11 and the metal layer 2, the first fiber reinforced resin layer 11 includes N1 layers of continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, the second fiber reinforced resin layer 12 includes N2 layers of continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, N1 and N2 are each independently an integer not less than 1, and the ply structure of the continuous fiber reinforced resin sheets in the first fiber reinforced resin layer 11 is symmetrical to the ply structure of the continuous fiber reinforced resin sheets in the second fiber reinforced resin layer 12.

[0029] The utility model stacks the first surface layer 1, the metal layer 2, the fiber felt 3 and the second surface layer 4 in sequence, which not only makes the protective plate lighter than the existing single-structure metal protective plate, but also makes the protective plate have the advantages of high rigidity, impact resistance, high energy absorption and high plasticity, and can effectively protect the new energy battery pack.

[0030] This symmetrically arranged ply structure can effectively improve the uniformity of the surface layer strength, improve the anti-warping performance of the protective plate, and make the protective plate less likely to warp during use.

[0031] For example, when the ply angle of the first fiber reinforced resin layer 11 is 0° / 90° / 45°, the ply angle of the second fiber reinforced resin layer 12 may be 45° / 90° / 0°.

[0032] The inventors have found that in the first fiber-reinforced resin layer 11, the glass fibers in any two adjacent continuous fiber-reinforced resin sheets have different laying angles; in the second fiber-reinforced resin layer 12, the glass fibers in any two adjacent continuous fiber-reinforced resin sheets have different laying angles. Meeting the above conditions can further improve the anti-warping performance of the protective plate.

[0033] like Figure 3 As shown, the first surface layer 1 also includes a third fiber reinforced resin layer 13, the third fiber reinforced resin layer 13 is arranged between the first fiber reinforced resin layer 11 and the second fiber reinforced resin layer 12, and the third fiber reinforced resin layer 13 includes N3 layers of continuous fiber reinforced resin sheets sequentially stacked along its thickness direction, and N3 is an integer not less than 2. The preparation method of the first surface layer 1 includes: firstly sequentially stacking N1 layers of continuous fiber reinforced resin sheets of the first fiber reinforced resin layer 11, then sequentially stacking N3 layers of continuous fiber reinforced resin sheets of the third fiber reinforced resin layer 13, and then sequentially stacking N2 layers of continuous fiber reinforced resin sheets of the second fiber reinforced resin layer 12, and finally hot pressing the three fiber reinforced resin layers to obtain the first surface layer 1.

[0034] Specifically, if N3 is an integer not less than 2, in the third fiber-reinforced resin layer 13, the ply structure of the x-th continuous fiber-reinforced resin sheet is symmetrical to the ply structure of the N3-x+1-th continuous fiber-reinforced resin sheet, x is an integer, and 1≤x≤N3 / 2. This symmetrical ply structure can further improve the uniformity of the surface layer strength, making it less likely for the protective plate to warp during use.

[0035] The inventors have found that in the third fiber reinforced resin layer 13, if N3 is an integer not less than 3, the ply structure of N3 layers of continuous fiber reinforced resin sheets cannot be completely the same. Further preferably, in the third fiber reinforced resin layer 13, the ply angle of the glass fiber in the xth layer of continuous fiber reinforced resin sheet is α1, the ply angle of the glass fiber in the x+1th layer of continuous fiber reinforced resin sheet is α2, and the ply angle of the glass fiber in the x+2th layer of continuous fiber reinforced resin sheet is α3, and at most two ply angles of α1, α2 and α3 have the same value (for example, α1=α2≠α3, or α1≠α2=α3), x is an integer, and 1≤x≤N3-2. Meeting the above conditions can further improve the anti-warping performance of the protective plate.

[0036] In one embodiment of the present invention, in the first surface layer 1, the total number of layers (N1+N2+N3) of the continuous fiber reinforced resin sheet is 5 to 20 layers, for example, it can be 4 layers, 5 layers, 10 layers, 12 layers, 15 layers, 18 layers, 20 layers or a range consisting of any two of the values.

[0037] In the present invention, N3 is preferably 1 to 14 layers, N3 ≥ N1, and N1 = N2.

[0038] In one embodiment of the present invention, in the first fiber reinforced resin layer 11, the second fiber reinforced resin layer 12 and the third fiber reinforced resin layer 13, the thickness of a layer of continuous fiber reinforced resin sheet is 0.15 to 0.5 mm, for example, it can be 0.15 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm or a range consisting of any two of these values.

[0039] The utility model can effectively improve the strength, toughness and rigidity of the protective plate by optimizing the number of layers and the thickness of the continuous fiber reinforced resin sheets in the surface layer, and can effectively improve the impact resistance of the protective plate while achieving the purpose of weight reduction.

[0040] In one embodiment of the present invention, the continuous fiber reinforced resin sheet is made of continuous fibers and resin through an existing melt impregnation process; the content of continuous fibers in the continuous fiber reinforced resin sheet is 50 to 85 wt%, for example, it can be 50%, 60%, 70%, 75%, 80%, 85% or a range consisting of any two of these values.

[0041] In one embodiment of the present invention, the first surface layer 1 and the metal layer 2 are connected via a first adhesive film 5 , and the thickness of the first adhesive film 5 is 0.05-0.5 mm.

[0042] In one embodiment of the present invention, the fiber felt 3 and the metal layer 2 are connected via a second adhesive film 6, and the thickness of the second adhesive film 6 is 0.05-0.5 mm.

[0043] In one embodiment of the present invention, the second surface layer 4 and the fiber felt 3 are connected via a third adhesive film 7, and the thickness of the third adhesive film 7 is 0.05-0.5 mm.

[0044] In one embodiment of the present invention, the thickness of the metal layer 2 is 0.5-2 mm, for example, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm or a range consisting of any two values ​​therein.

[0045] In one embodiment of the present invention, the material of the metal layer 2 is any one of aluminum, aluminum alloy, steel, titanium and titanium alloy.

[0046] In one embodiment of the present invention, the thickness of the fiber felt 3 is 1-10 mm, for example, 1 mm, 2 mm, 4 mm, 6 mm, 7 mm, 8 mm, 10 mm or a range consisting of any two values ​​therein.

[0047] In the present invention, the fiber felt 3 can be polypropylene / glass fiber felt, polypropylene / carbon fiber felt, polypropylene / aramid fiber felt, nylon / glass fiber felt, nylon / carbon fiber felt.

[0048] The utility model optimizes the thickness of the metal layer 2 and the fiber felt 3 so that the material plate is lightweight and has excellent performances of impact resistance, shock absorption and energy absorption.

[0049] In one embodiment of the present invention, Figure 3 As shown, the first surface layer 1 is provided with a first functional layer 8 on the side facing away from the metal layer 2 , and the first functional layer 8 is a film layer or a non-woven fabric layer; the thickness of the first functional layer 8 is 0.05-0.5 mm.

[0050] In one embodiment of the present invention, Figure 3 As shown, the second surface layer 4 is provided with a second functional layer 9 on the side facing away from the fiber felt 3. The second functional layer 9 is a film layer or a non-woven fabric layer. The thickness of the second functional layer is 0.05-0.5 mm.

[0051] In the present invention, the material of the film layer can be polypropylene film.

[0052] In one embodiment of the present invention, each layer of the protective plate is formed by an existing hot pressing process.

[0053] The present invention provides the following embodiments to facilitate understanding of the present invention. The present invention provides these embodiments but is not intended to limit the scope of the claims.

[0054] Example 1

[0055] This embodiment provides a protective plate, and its structure is shown in FIG. Figure 1 and 3 The protective plate includes a first surface layer 1, a first adhesive film 5, a metal layer 2, a second adhesive film 6, a fiber felt 3, a third adhesive film 7 and a second surface layer 4 which are stacked in sequence.

[0056] The thickness of the first adhesive film 5 , the second adhesive film 6 and the third adhesive film 7 are all 0.1 mm.

[0057] The material of the metal layer 2 is high-strength steel 780DP, and the thickness of the metal layer 2 is 1 mm.

[0058] The material of the fiber felt 3 is polypropylene / glass fiber felt (LT-L2-10, 1200 gsm, produced by Jiangsu Langtian Composite Materials Co., Ltd.), and the thickness of the fiber felt 3 is 7 mm.

[0059] The first surface layer 1 is composed of a first fiber reinforced resin layer 11, a third fiber reinforced resin layer 13 and a second fiber reinforced resin layer 12 stacked in sequence, the second fiber reinforced resin layer 12 is arranged between the first fiber reinforced resin layer 11 and the metal layer 2, the first fiber reinforced resin layer 11 is composed of N1 layers of continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, the second fiber reinforced resin layer 12 is composed of N2 layers of continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, the third fiber reinforced resin layer 13 is composed of N3 layers of continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, N1 and N2 are both 3, N3 is 4, that is, the total number of layers of each continuous fiber reinforced resin sheet in the first surface layer 1 is 10 layers; the thickness of each continuous fiber reinforced resin sheet is 0.2mm; the continuous fiber reinforced resin sheet is made of continuous glass fiber and copolymerized polypropylene resin through an existing melt impregnation process, and the content of continuous fiber in the continuous fiber reinforced resin sheet is 75wt%.

[0060] When preparing the first surface layer 1, N1 layers of continuous fiber reinforced resin sheets of the first fiber reinforced resin layer 11 can be stacked in sequence first, and then N3 layers of continuous fiber reinforced resin sheets of the third fiber reinforced resin layer 13 can be stacked in sequence, and then N2 layers of continuous fiber reinforced resin sheets of the second fiber reinforced resin layer 12 can be stacked in sequence, and finally the three fiber reinforced resin layers are hot pressed to obtain the first surface layer 1.

[0061] The continuous glass fibers in the first fiber reinforced layer 11 adopt a 0° / 90° / 45° ply design, the continuous glass fibers in the third fiber reinforced layer 13 adopt a 0° / 90° / 90° / 0° ply design, and the continuous glass fibers in the second fiber reinforced layer 12 adopt a 45° / 90° / 0° ply design. The 0°, 90°, and 45° are ply angles, which refer to the angle between the glass fibers in the continuous fiber reinforced resin sheet and the x-axis of the reference coordinate system.

[0062] The second surface layer 4 has the same structure as the first surface layer 1 and is symmetrically arranged.

[0063] Example 2

[0064] This embodiment provides a protective plate. The difference between this embodiment and Embodiment 1 is that the thickness of the continuous fiber reinforced resin sheet used in this embodiment is 0.15 mm, and the content of continuous fibers in the continuous fiber reinforced resin sheet is 50 wt %.

[0065] The thickness of the first adhesive film 5 , the second adhesive film 6 and the third adhesive film 7 are all 0.05 mm.

[0066] The thickness of the metal layer 2 is 0.5 mm.

[0067] The thickness of the fiber mat 3 is 1 mm.

[0068] Example 3

[0069] This embodiment provides a protective plate. The difference between this embodiment and Embodiment 1 is that the thickness of the continuous fiber reinforced resin sheet used in this embodiment is 0.5 mm, and the content of continuous fibers in the continuous fiber reinforced resin sheet is 85 wt %.

[0070] The thickness of the first adhesive film 5 , the second adhesive film 6 and the third adhesive film 7 are all 0.5 mm.

[0071] The thickness of the metal layer 2 is 2 mm.

[0072] The fiber mat 3 has a thickness of 10 mm.

[0073] Examples 4 to 10 and Comparative Example 1

[0074] Examples 4 to 10 and Comparative Example 1 respectively provide a protective plate. The differences between Examples 4 to 10 and Comparative Example 1 and Example 1 are that in Examples 4 to 10 and Comparative Example 1, N1, N2, N3 and the adopted layer design are as shown in Table 1. If any value of N1, N2, N3 in Table 1 is 0, it means that there is no corresponding fiber reinforced resin layer structure.

[0075] Table 1

[0076]

[0077]

[0078] Comparative Example 2

[0079] The difference between this comparative example and Example 1 is that the second surface layer is not provided in this comparative example.

[0080] Comparative Example 3

[0081] The difference between this comparative example and Example 1 is that the fiber felt and the third adhesive film are not provided in this comparative example, but the first surface layer 1, the first adhesive film 5, the metal layer 2, the second adhesive film 6 and the second surface layer 4 are stacked in sequence.

[0082] Performance Test:

[0083] The protective plates provided in the above embodiments and comparative examples were tested, and the test results are shown in Table 2. The test method is:

[0084] (1) Impact resistance test: Cut the protective plate into 500mm*500mm samples. The test conditions are: 25mm ball head, frontal impact, and the impact energy is 200J, 300J, and 400J respectively. The test operation steps refer to ASTMD7136-D7136M standard;

[0085] (2) Plane warpage: Cut the protective plate into 500 mm*500 mm samples and place them on a marble table. Measure the height between the upper surface of the sample and the marble table (denoted as h). Use a 1 kg weight to press down one corner of the square plate and measure the height between the highest point of the sample warpage and the table (denoted as H). Hh is the plane warpage, expressed in mm.

[0086] Table 2

[0087]

[0088]

[0089] It can be seen from Table 2 that the utility model adopts a surface layer with a symmetrical ply structure and controls the total number of layers of continuous fiber reinforced resin sheets in each surface layer to 5 to 20 layers, which can effectively improve the warping resistance of the protective plate and improve the impact resistance of the protective plate; in Example 7, the number of layers of continuous fiber reinforced resin sheets is too small, and the warping resistance and impact resistance of the protective plate are poor; in Example 9, the ply angles of each continuous fiber reinforced resin sheet are the same, which makes the warping resistance and impact resistance of the protective plate poor.

[0090] It can be seen from Example 8 and Example 10 that the third fiber-reinforced resin layer 13 is a symmetrical layer structure, which makes the protective plate have better anti-warping and impact resistance.

[0091] It can be seen from Example 7 and Comparative Example 1 that the ply structure of the continuous fiber reinforced resin sheet in the first fiber reinforced resin layer 11 is symmetrical with the ply structure of the continuous fiber reinforced resin sheet in the second fiber reinforced resin layer 12, which can effectively improve the warping resistance of the protective plate.

[0092] Compared with Example 1, Comparative Example 2 does not have a second surface layer, and Comparative Example 3 does not have a fiber felt, which reduces the impact resistance of the protective plate and significantly reduces the anti-warping performance.

[0093] It should be understood that in the present invention, the layup angle is determined by establishing transverse and longitudinal coordinate axes in the plane where the substrate is located, with the long side of the substrate as the transverse direction, the transverse side as 0°, and the longitudinal side as 90°, and the angle between the length direction of the continuous fiber and the transverse direction is the layup angle.

[0094] It should be understood that in the description of the present invention, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0095] In the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A protective plate, characterized in that: The invention comprises a first surface layer, a metal layer, a fiber felt and a second surface layer which are arranged in sequence, wherein the first surface layer comprises a first fiber-reinforced resin layer and a second fiber-reinforced resin layer which are arranged in sequence, wherein the first fiber-reinforced resin layer comprises N1 layers of continuous fiber-reinforced resin sheets which are sequentially stacked along its thickness direction, and the second fiber-reinforced resin layer comprises N2 layers of continuous fiber-reinforced resin sheets which are sequentially stacked along its thickness direction, wherein N1 and N2 are each independently an integer not less than 1, and the ply structure of the continuous fiber-reinforced resin sheets in the first fiber-reinforced resin layer is symmetrical to the ply structure of the continuous fiber-reinforced resin sheets in the second fiber-reinforced resin layer; The first surface layer further includes a third fiber-reinforced resin layer, the third fiber-reinforced resin layer is disposed between the first fiber-reinforced resin layer and the second fiber-reinforced resin layer, the third fiber-reinforced resin layer includes N3 layers of continuous fiber-reinforced resin sheets sequentially stacked along the thickness direction thereof, N3 being an integer not less than 1; The second surface layer has the same structure as the first surface layer and is symmetrically arranged.

2. The protective plate according to claim 1, characterized in that: N3 is an integer not less than 2; in the third fiber reinforced resin layer, the ply structure of the xth continuous fiber reinforced resin sheet is symmetrical to the ply structure of the N3-x+1th continuous fiber reinforced resin sheet, x is an integer, and 1≤x≤N3 / 2.

3. The protective plate according to claim 1, characterized in that: The thickness of the continuous fiber reinforced resin sheet is 0.15-0.5 mm; in the first surface layer, the total number of layers of the continuous fiber reinforced resin sheet is 5-20.

4. The protective plate according to claim 1, characterized in that: The first surface layer is connected to the metal layer via a first adhesive film, the fiber felt is connected to the metal layer via a second adhesive film, and a first functional layer is provided on a side of the first surface layer facing away from the metal layer.

5. The protective plate according to claim 4, characterized in that: The first functional layer is a film layer or a non-woven fabric layer; the thickness of the first functional layer is 0.05-0.5 mm.

6. The protective plate according to claim 1, characterized in that: The second surface layer is connected to the fiber mat via a third adhesive film, and a second functional layer is provided on a side of the second surface layer facing away from the fiber mat.

7. The protective plate according to claim 6, characterized in that: The second functional layer is a film layer or a non-woven fabric layer; the thickness of the second functional layer is 0.05-0.5 mm.

8. The protective plate according to claim 1, characterized in that: The fiber felt has a thickness of 1 to 10 mm.

9. The protective plate according to claim 1, characterized in that: The thickness of the metal layer is 0.5-2 mm.

10. A new energy battery pack, characterized in that: The invention comprises a pallet and a protective plate as claimed in any one of claims 1 to 9, wherein the protective plate is arranged on the pallet.

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