Battery pack sealing cover and power battery

Abstract

The present application relates to the technical field of new energy, and discloses a battery pack sealing cover and a power battery. The battery pack sealing cover comprises a first continuous fiber reinforced composite plate, a heat insulation layer, a buffer layer, and a second continuous fiber reinforced composite plate which are sequentially stacked. The first continuous fiber reinforced composite plate comprises n1 layers of first continuous fiber reinforced resin sheets which are sequentially stacked in the thickness direction of the first continuous fiber reinforced composite plate; and the second continuous fiber reinforced composite plate comprises n2 layers of second continuous fiber reinforced resin sheets which are sequentially stacked in the thickness direction of the second continuous fiber reinforced composite plate. The battery pack sealing cover provided in the present application not only has light weight, high strength, and good insulativity, but also can realize more excellent fire resistance and thermal barrier performance by providing the heat insulation layer. In the present application, the buffer layer is provided between the heat insulation layer and the second continuous fiber reinforced composite plate, so that the impact energy can be effectively absorbed, improving the impact resistance of the sealing cover.

Description

Battery pack sealing cover and power battery Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a battery pack sealing cover and a power battery. Background Art

[0002] New energy vehicles are developing rapidly, and technology has advanced by leaps and bounds in recent years. Among them, the structural form of power battery packs is also constantly evolving. Existing technologies usually use metal sealing covers or plastic sealing covers to seal power battery packs. Metal sealing covers, such as steel sealing covers and aluminum sealing covers, are heavy, costly, and not insulating; plastic sealing covers are receiving more and more attention due to their advantages of insulation and light weight. However, most of the existing plastic sealing covers are single-layer PP (polypropylene) structures or single-layer short glass fiber reinforced thermoplastic materials (such as LFT-D) board structures. Sealing covers of this type of structure have the defects of significantly low impact resistance and poor thermal barrier properties, and cannot effectively deal with the problem of battery pack combustion caused by thermal runaway, or even the spread of fire.

[0003] Therefore, it is very necessary to design a battery pack sealing cover with good thermal barrier performance and excellent impact resistance.

[0004] Application Contents

[0005] The purpose of this application is to overcome the shortcomings of the existing technology and provide a battery pack sealing cover and a power battery. The battery pack sealing cover has the advantages of light weight, high strength, good insulation, and also has excellent thermal barrier performance and impact resistance.

[0006] To achieve the above objectives, the technical solutions adopted in this application are:

[0007] In the first aspect, the present application provides a battery pack sealing cover, comprising a first continuous fiber reinforced composite plate, a thermal insulation layer, a buffer layer and a second continuous fiber reinforced composite plate stacked in sequence; the thickness ratio of the thermal insulation layer to the buffer layer is 1:(1-60); the first continuous fiber reinforced composite plate comprises n1 layers of first continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, where n1 is an integer greater than or equal to 1; the second continuous fiber reinforced composite plate comprises n2 layers of second continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, where n2 is an integer greater than or equal to 1.

[0008] As a preferred embodiment of the present application, when n1 and n2 are each an integer greater than or equal to 2, the angle between the continuous fibers in two adjacent layers of the first continuous fiber reinforced resin sheet and the angle between the continuous fibers in two adjacent layers of the second continuous fiber reinforced resin sheet are each independently 0-90°.

[0009] As a preferred embodiment of the present application, when n1 is an integer greater than or equal to 2, the first continuous fiber-reinforced resin sheet has a different first lay-up angle, and when n2 is an integer greater than or equal to 2, the second continuous fiber-reinforced resin sheet has a different second lay-up angle, and the first lay-up angle and the second lay-up angle are each independently greater than -90° and less than or equal to 90°.

[0010] As a preferred embodiment of the present application, the thickness ratio of the thermal insulation layer to the buffer layer is 1:(6-12).

[0011] As a preferred embodiment of the present application, the thickness of the first continuous fiber reinforced resin sheet and the thickness of the second continuous fiber reinforced resin sheet are each independently 0.1-0.5 mm.

[0012] As a preferred embodiment of the present application, the thickness of the first continuous fiber reinforced composite material plate and the thickness of the second continuous fiber reinforced composite material plate are each independently 0.5-3 mm.

[0013] As a preferred embodiment of the present application, n1 is an integer of 3-10, and n2 is an integer of 3-10.

[0014] As a preferred embodiment of the present application, the thermal insulation layer is glass fiber cloth or asbestos cloth.

[0015] As a preferred embodiment of the present application, the thickness of the thermal insulation layer is 0.1-1 mm.

[0016] As a preferred embodiment of the present application, the buffer layer is a honeycomb core or a glass fiber mat reinforced thermoplastic composite material plate.

[0017] As a preferred embodiment of the present application, the thickness of the buffer layer is 1-6 mm.

[0018] As a preferred embodiment of the present application, a first adhesive layer is provided between the thermal insulation layer and the buffer layer, and a second adhesive layer is provided between the thermal insulation layer and the first continuous fiber reinforced composite material plate.

[0019] As a preferred embodiment of the present application, the battery pack sealing cover is a plate-like structure or a structure with one end open and a hollow interior.

[0020] In a second aspect, the present application provides a power battery comprising a tray, a battery pack, and a battery pack sealing cover as described in the first aspect, wherein the tray and the battery pack sealing cover are combined to form a battery pack having a battery accommodating space, and the battery pack is disposed in the accommodating space of the battery pack.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) The battery pack sealing cover provided in this application is not only light in weight, high in strength, and has good insulation properties, but also can achieve more excellent fire resistance and heat barrier properties by providing a heat insulation layer;

[0023] (2) The present application provides a buffer layer between the thermal insulation layer and the second continuous fiber reinforced composite material plate, which can effectively absorb impact energy and improve the impact resistance of the sealing cover;

[0024] (3) The battery pack sealing cover provided in this application is suitable for new energy power batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a schematic diagram of the layered structure of a battery pack sealing cover provided in one embodiment of the present application;

[0026] FIG2 is an overall structural diagram of a battery pack sealing cover provided in one embodiment of the present application;

[0027] FIG3 is a schematic diagram of the ply angle provided in this application.

[0028] In the figure, 1-insulation layer, 2-buffer layer, 3-first continuous fiber reinforced composite material plate, 4-second continuous fiber reinforced composite material plate, 5-first adhesive layer, 6-second adhesive layer. DETAILED DESCRIPTION

[0029] 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 part of the embodiments of this application, not all of them. Based on the embodiments of 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.

[0030] Referring to Figures 1-2, the present application provides a battery pack sealing cover, including a first continuous fiber reinforced composite plate 3, an insulation layer 1, a buffer layer 2 and a second continuous fiber reinforced composite plate 4 stacked in sequence; the first continuous fiber reinforced composite plate 3 includes n1 layers of first continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, for example, the direction Z shown in Figure 1, where n1 is an integer greater than or equal to 1; the second continuous fiber reinforced composite plate 4 includes n2 layers of second continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, for example, the direction Z shown in Figure 1, where n2 is an integer greater than or equal to 1.

[0031] Based on the above technical solution, the battery pack sealing cover provided by the present application is not only light in weight, high in strength, and has good insulation properties, but also can achieve more excellent fire resistance and heat barrier properties by setting a thermal insulation layer 1; the present application sets a buffer layer 2 between the thermal insulation layer 1 and the second continuous fiber reinforced composite material plate 4, which can effectively absorb impact energy, thereby improving the impact resistance of the sealing cover.

[0032] The thickness ratio of the thermal insulation layer 1 and the buffer layer 2 is 1:(1-60), and more preferably 1:(6-12). The present application controls the thickness ratio of the thermal insulation layer 1 and the buffer layer 2 within the above range, which can ensure excellent fire resistance while ensuring that the material has a relatively low thickness and weight. On the one hand, the buffer layer 2 can effectively play a role in impact resistance. The thicker the buffer layer 2, the better the impact resistance, but a thicker buffer layer 2 will cause the battery pack sealing cover to be thicker and heavier as a whole, which is not conducive to the requirement of lightweight automobiles; on the other hand, the thermal insulation layer 1 can avoid or delay thermal runaway or burn-through problems caused by heat convergence; the thicker the thermal insulation layer 1, the better the fire resistance, but when the overall thickness of the product remains unchanged, a thicker thermal insulation layer 1 will sacrifice some impact resistance. Therefore, controlling the thickness ratio of the thermal insulation layer 1 and the buffer layer 2 within the range of 1:(1-60) can effectively balance the impact resistance and fire resistance of the battery pack sealing cover. By controlling the thickness ratio of the thermal insulation layer 1 and the buffer layer 2 within the range of 1:(6-12), the comprehensive performance of the impact resistance and fire resistance of the battery pack sealing cover is better.

[0033] In one embodiment, when n1 and n2 are each an integer greater than or equal to 2, the angle between the continuous fibers in two adjacent layers of the first continuous fiber-reinforced resin sheet and the angle between the continuous fibers in two adjacent layers of the second continuous fiber-reinforced resin sheet are each independently 0-90°, for example, 0°, 30°, 45°, 60°, 90°, or a range consisting of any two of these values.

[0034] In one embodiment, when n1 is an integer greater than or equal to 2, the continuous fibers in the first continuous fiber reinforced resin sheet adopt different lay-up angles, and when n2 is an integer greater than or equal to 2, the continuous fibers in the second continuous fiber reinforced resin sheet adopt different second lay-up angles, and the first lay-up angle and the second lay-up angle are each independently -45° to 90°. Such lay-up angles enable the laminated first continuous fiber reinforced composite material plate and the second continuous fiber reinforced composite material plate to more effectively absorb external energy, effectively improve the shear resistance between each layer, and further improve the impact resistance of the battery pack sealing cover.

[0035] In one embodiment, the thickness of the first continuous fiber reinforced resin sheet and the thickness of the second continuous fiber reinforced resin sheet are each independently 0.1-0.5 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or a range consisting of any two values ​​therein.

[0036] In one embodiment, the thickness of the first continuous fiber reinforced composite plate 3 and the thickness of the second continuous fiber reinforced composite plate 4 are each independently 0.5-3 mm, for example, they can be 0.5 mm, 0.6 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, or a range consisting of any two of these values.

[0037] In one embodiment, n1 is an integer from 3 to 10, and n2 is an integer from 3 to 10.

[0038] In the present application, the thickness of the first continuous fiber reinforced composite plate 3 and the thickness of the second continuous fiber reinforced composite plate 4 are controlled to be 0.5-3 mm, and n1 is set to an integer of 3-10 and n2 is set to an integer of 3-10, which can effectively improve the impact resistance of the sealing cover.

[0039] In one embodiment, the total thickness of the sealing cover is 2-10 mm.

[0040] In one embodiment, the heat insulation layer 1 is glass fiber cloth or asbestos cloth.

[0041] In one embodiment, the thickness of the thermal insulation layer 1 is 0.1-1 mm, for example, 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1 mm, or a range consisting of any two values ​​therein.

[0042] This application uses glass fiber cloth or asbestos cloth of appropriate thickness as the insulation layer, which not only has good thermal insulation performance, but also has the advantages of corrosion resistance, high temperature resistance, and non-combustibility, which can enable the sealing cover to achieve more excellent fire resistance and heat barrier performance.

[0043] In one embodiment, the thickness of the buffer layer 2 is 1-6 mm, for example, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, or a range consisting of any two values ​​therein.

[0044] In one embodiment, the buffer layer 2 is a honeycomb core or a glass fiber mat reinforced thermoplastic composite material panel.

[0045] Specifically, the thickness of the honeycomb core is 1-6 mm; the thickness of the glass fiber mat reinforced thermoplastic composite material plate is 3-6 mm.

[0046] In one embodiment, a first adhesive layer 5 is provided between the heat insulating layer 1 and the buffer layer 2 , and the thickness of the first adhesive layer 5 is 0.1-0.3 mm.

[0047] In one embodiment, a second adhesive layer 6 is provided between the thermal insulation layer 1 and the first continuous fiber reinforced composite material plate 3 , and the thickness of the second adhesive layer 6 is 0.1-0.3 mm.

[0048] In one embodiment, the battery pack sealing cover is a plate-shaped structure, or a structure with one end open and a hollow interior.

[0049] In the present application, the first continuous fiber reinforced resin sheet and the second continuous fiber reinforced resin sheet are each independently composited by continuous fibers and resin through an existing melt impregnation process, and the mass fraction of the continuous fibers in the first continuous fiber reinforced resin sheet and the mass fraction of the continuous fibers in the second continuous fiber reinforced resin sheet are each independently 30-70%, for example, it can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, or a range consisting of any two of these values.

[0050] The present application limits the contents of continuous fibers and resin in the continuous fiber reinforced resin sheet, so that the continuous fiber reinforced resin sheet has the advantages of light weight and high strength.

[0051] Specifically, the continuous fibers in the first continuous fiber reinforced resin sheet and the continuous fibers in the second continuous fiber reinforced resin sheet are independently continuous glass fibers, continuous unidirectional carbon fibers, continuous unidirectional aramid fibers, continuous unidirectional basalt fibers or continuous unidirectional silicon carbide fibers.

[0052] Specifically, the resin in the first continuous fiber reinforced resin sheet and the resin in the second continuous fiber reinforced resin sheet are independently flame retardant polypropylene resin, non-flame retardant polypropylene resin, polyethylene, polystyrene, polycarbonate or polyamide.

[0053] Specifically, the buffer layer is a honeycomb core, and the honeycomb core is any one of homopolymer polypropylene resin, copolymer polypropylene resin and maleic anhydride graft copolymer polypropylene resin.

[0054] Specifically, each layer of the battery pack sealing cover is formed by an existing hot pressing process.

[0055] The present application also provides a power battery, comprising a tray, a battery pack and a battery pack sealing cover as described in the present application, wherein the tray and the battery pack sealing cover are combined to form a battery pack having a battery accommodating space, and the battery pack is arranged in the accommodating space of the battery pack.

[0056] The following examples are provided to facilitate understanding of the present application. These examples are not provided to limit the scope of the claims.

[0057] Example 1

[0058] 1-2 , this embodiment provides a battery pack sealing cover, including a first continuous fiber reinforced composite material plate 3, a heat insulation layer 1, a buffer layer 2, and a second continuous fiber reinforced composite material plate 4 stacked sequentially in the Z direction;

[0059] The first continuous fiber-reinforced composite material plate 3 includes n1 layers of first continuous fiber-reinforced resin sheets stacked sequentially along its thickness direction, i.e., the Z direction, where n1 = 3. The thickness of the first continuous fiber-reinforced resin sheet is 0.3 mm. With the horizontal X-axis (such as the X-axis in FIG. 3 ) as a reference, 0° indicates that the direction of the continuous fibers of the first continuous fiber-reinforced resin sheet is parallel to the X-axis. In this embodiment, the continuous fibers of the three layers of the first continuous fiber-reinforced resin sheet are laid at a ply angle of 0° / 90° / 0°.

[0060] The second continuous fiber-reinforced composite material plate 4 includes n2 layers of second continuous fiber-reinforced resin sheets stacked sequentially along its thickness direction, i.e., the Z direction, where n2 = 3. The thickness of the second continuous fiber-reinforced resin sheet is 0.3 mm. With the horizontal X-axis (such as the direction of the X-axis in FIG. 3 ) as a reference, 0° indicates that the direction of the continuous fibers of the second continuous fiber-reinforced resin sheet is parallel to the X-axis. In this embodiment, the continuous fibers of the three layers of the second continuous fiber-reinforced resin sheet are laid at a ply angle of 0° / 90° / 0°.

[0061] The thermal insulation layer 1 is glass fiber cloth, and the thickness of the thermal insulation layer 1 is 0.5 mm; the buffer layer 2 is glass fiber felt, and the thickness of the buffer layer 2 is 6 mm; a first adhesive layer 5 is provided between the thermal insulation layer 1 and the buffer layer 2, and the thickness of the first adhesive layer 5 is 0.1 mm; a second adhesive layer 6 is provided between the thermal insulation layer 1 and the first continuous fiber reinforced composite material plate 3, and the thickness of the second adhesive layer 6 is 0.1 mm;

[0062] The first continuous fiber reinforced resin sheet and the second continuous fiber reinforced resin sheet are both composited by continuous glass fiber and flame retardant polypropylene resin through the existing melt impregnation process. The mass fraction of the continuous glass fiber in the first continuous fiber reinforced resin sheet is 60%, and the mass fraction of the continuous glass fiber in the second continuous fiber reinforced resin sheet is 60%.

[0063] Example 2

[0064] This embodiment provides a battery pack sealing cover. The difference between this embodiment and embodiment 1 is that:

[0065] In this embodiment, n1=10, the thickness of the first continuous fiber-reinforced resin sheet is 0.15 mm, and the ply angles are 0° / 90° / 45° / -45° / 0° / 0° / -45° / 45° / 90° / 0°, where 0° indicates that the direction of the continuous fibers of the first continuous fiber-reinforced resin sheet is parallel to the X-axis;

[0066] n2=10, the thickness of the second continuous fiber-reinforced resin sheet is 0.15 mm, and the ply angles are 0° / 90° / 45° / -45° / 0° / 0° / -45° / 45° / 90° / 0°, where 0° indicates that the direction of the continuous fibers of the second continuous fiber-reinforced resin sheet is parallel to the X-axis;

[0067] The thermal insulation layer 1 is glass fiber cloth, and the thickness of the thermal insulation layer 1 is 0.1 mm; the buffer layer 2 is a glass fiber mat reinforced thermoplastic composite material board, and the thickness of the buffer layer 2 is 6 mm; a first adhesive layer 5 is provided between the thermal insulation layer 1 and the buffer layer 2, and the thickness of the first adhesive layer 5 is 0.1 mm; a second adhesive layer 6 is provided between the thermal insulation layer 1 and the second continuous fiber reinforced composite material board 4, and the thickness of the second adhesive layer 6 is 0.1 mm;

[0068] The mass fraction of the continuous glass fibers in the first continuous fiber reinforced resin sheet is 65%, and the mass fraction of the continuous glass fibers in the second continuous fiber reinforced resin sheet is 65%.

[0069] Example 3

[0070] This embodiment provides a battery pack sealing cover. The difference between this embodiment and embodiment 1 is that:

[0071] In this embodiment, the thickness of the first continuous fiber reinforced resin sheet is 0.5 mm;

[0072] The thickness of the second continuous fiber reinforced resin sheet is 0.5 mm;

[0073] The heat insulation layer 1 is asbestos cloth, and the thickness of the heat insulation layer 1 is 0.5 mm; the buffer layer 2 is a honeycomb core, and the thickness of the buffer layer 2 is 3 mm.

[0074] Example 4

[0075] This embodiment provides a battery pack sealing cover. The difference between this embodiment and embodiment 1 is that:

[0076] In this embodiment, the first continuous fiber-reinforced composite material panel 3 includes n1 layers of first continuous fiber-reinforced resin sheets stacked sequentially along its thickness direction, where n1 = 5. The thickness of the first continuous fiber-reinforced resin sheet is 0.1 mm. With the horizontal X-axis (such as the X-axis in FIG. 3 ) as the reference, 0° indicates that the direction of the continuous fibers of the first continuous fiber-reinforced resin sheet is parallel to the X-axis. In this embodiment, the continuous fibers of the five layers of the first continuous fiber-reinforced resin sheet are laid at ply angles of 0° / 90° / 45° / -45° / 0°.

[0077] The second continuous fiber-reinforced composite material plate 4 includes n2 layers of second continuous fiber-reinforced resin sheets stacked sequentially along its thickness direction, where n2 = 5. The thickness of the second continuous fiber-reinforced resin sheet is 0.1 mm. With respect to the horizontal X-axis (e.g., the X-axis in FIG. 3 ), 0° indicates that the continuous fibers of the second continuous fiber-reinforced resin sheet are parallel to the X-axis. In this embodiment, the continuous fibers of the five layers of the second continuous fiber-reinforced resin sheet are laid at ply angles of 0° / 90° / 45° / -45° / 0°.

[0078] The thickness of the thermal insulation layer is 0.1 mm, and the thickness of the buffer layer is 1 mm.

[0079] Performance Testing

[0080] The sealing cover of the above embodiment was subjected to the following performance tests:

[0081] (1) Insulation test:

[0082] The volume resistivity of the sealing cover material is tested according to the national standard GB / T 31838.2-2019, and the test condition is an electrification time of 60s.

[0083] (2) Impact resistance test:

[0084] According to ASTM D7136 / D7136M-20, the seal cap samples were tested for penetration and maximum indentation depth when subjected to a 300J impact energy. Test conditions: hammer diameter 25mm, hammer weight 30kg, height 1m.

[0085] (3) Fire resistance test:

[0086] The prepared sealing cover sample was placed under a 1200°C flame and burned for 5 minutes, and the sealing cover sample was observed to see if it was burned through.

[0087] The test results are shown in Table 1 below.

[0088] Table 1

[0089] As can be seen from Table 1, the material provided in this application has excellent insulation, impact resistance and thermal barrier properties, and is suitable for new energy power batteries.

[0090] In this application, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Furthermore, when a range refers to a range of integer values, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed in this application should be understood to include any and all subranges subsumed therein.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0092] In the description of this application, it should be understood that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0093] Unless otherwise specified, the materials used in this application are commercially available materials.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A battery pack sealing cover, characterized in that: It includes a first continuous fiber reinforced composite material plate, a thermal insulation layer, a buffer layer and a second continuous fiber reinforced composite material plate stacked in sequence; the thickness ratio of the thermal insulation layer to the buffer layer is 1:(1-60); the first continuous fiber reinforced composite material plate includes n1 layers of first continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, n1 is an integer greater than or equal to 1; the second continuous fiber reinforced composite material plate includes n2 layers of second continuous fiber reinforced resin sheets stacked in sequence along its thickness direction, n2 is an integer greater than or equal to 1.

2. The battery pack sealing cover according to claim 1, wherein: When n1 and n2 are each an integer greater than or equal to 2, the angle between the continuous fibers in two adjacent first continuous fiber reinforced resin sheets and the angle between the continuous fibers in two adjacent second continuous fiber reinforced resin sheets are each independently 0-90°.

3. The battery pack sealing cover according to claim 1, wherein: When n1 is an integer greater than or equal to 2, the continuous fibers in the first continuous fiber-reinforced resin sheet adopt different first lay-up angles, and when n2 is an integer greater than or equal to 2, the continuous fibers in the second continuous fiber-reinforced resin sheet adopt different second lay-up angles, and the first lay-up angle and the second lay-up angle are each independently -45° to 90°.

4. The battery pack sealing cover according to claim 1, wherein: The thickness of the first continuous fiber reinforced resin sheet and the thickness of the second continuous fiber reinforced resin sheet are each independently 0.1-0.5 mm; the thickness of the first continuous fiber reinforced composite material plate and the second continuous fiber reinforced composite plate are each independently 0.5-3 mm.

5. The battery pack sealing cover according to claim 1, wherein: The thickness ratio of the heat insulation layer to the buffer layer is 1:(6-12).

6. The battery pack sealing cover according to claim 1, wherein: n1 is an integer from 3 to 10, and n2 is an integer from 3 to 10.

7. The battery pack sealing cover according to claim 1, wherein: The heat insulation layer is glass fiber cloth or asbestos cloth, and the thickness of the heat insulation layer is 0.1-1 mm.

8. The battery pack sealing cover according to claim 1, wherein: The buffer layer is a honeycomb core or a glass fiber mat reinforced thermoplastic composite material plate; the thickness of the buffer layer is 1-6 mm.

9. The battery pack sealing cover according to claim 1, wherein: A first adhesive layer is provided between the thermal insulation layer and the buffer layer, and a second adhesive layer is provided between the thermal insulation layer and the first continuous fiber reinforced composite material plate.

10. The battery pack sealing cover according to claim 8, wherein: The battery pack sealing cover is a plate-shaped structure or a structure with one end open and a hollow interior.

11. A power battery, characterized in that: The battery pack comprises a tray, a battery pack and a battery pack sealing cover as described in any one of claims 1 to 10, wherein the tray and the battery pack sealing cover are combined to form a battery pack having a battery accommodating space, and the battery pack is arranged in the accommodating space of the battery pack.

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