Battery pack bottom protection plate, battery pack and vehicle

Abstract

The utility model relates to a battery pack bottom guard plate which comprises a first fiber reinforced polymer layer, a middle layer and a second fiber reinforced polymer layer which are sequentially arranged from top to bottom, and the middle layer comprises a fiber reinforced polymer enclosure frame provided with a matched through hole and a metal plate matched with the matched through hole. The upper side face of the metal plate is combined with the lower side face of the first fiber reinforced polymer layer, the lower side face of the metal plate is combined with the upper side face of the second fiber reinforced polymer layer, and the upper side face of the fiber reinforced polymer enclosure frame and the lower side face of the first fiber reinforced polymer layer are arranged in a contact or clearance mode. The lower side face of the fiber reinforced polymer enclosure frame and the upper side face of the second fiber reinforced polymer layer are arranged in a contact or clearance mode. The utility model further provides a battery pack and a vehicle. The multi-layer composite structure of the battery pack bottom protection plate is optimized, the battery pack bottom protection plate has the advantage of being easy to manufacture, and the structural stability, durability, impact resistance, corrosion resistance and light weight level of the battery pack bottom protection plate are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field, concretely relates to a battery pack bottom guard plate, battery pack and vehicle. BACKGROUND

[0002] The battery pack is as the core part of new energy vehicle, and the bottom protection performance directly influences the service life and safety of new energy vehicle. Part battery pack bottom guard plate adopts single material to make or simple double -deck composite structure, and it is difficult to meet the needs of anticorrosion, impact resistance and light weight simultaneously. Especially under the complex working condition such as severe weather, complex road condition, the bottom of battery pack is vulnerable to stone impact, sand impact and chemical corrosion, can cause the failure of battery pack bottom guard plate, and then the performance and life of battery pack are caused the adverse effect.

[0003] Part battery pack bottom guard plate adopts multilayer composite structure, although it can alleviate the above -mentioned problem to some extent. However, the battery pack bottom guard plate with multilayer composite structure still has the following technical problems:

[0004] The multilayer composite material layers need to be combined with each other, and there is a problem of greater manufacturing difficulty.

[0005] Part battery pack bottom guard plate is provided with metal material layer in multilayer composite structure, and the delamination or even the falling phenomenon is likely to occur between the composite material layer and the metal material layer. Moreover, the more metal material layers set will adversely affect the light weight of the battery pack bottom guard plate.

[0006] The impact resistance of the battery pack bottom guard plate is still insufficient, and it is difficult to effectively absorb and disperse the impact force, resulting in the damage of the bottom structure of the battery pack.

[0007] The corrosion resistance of the battery pack bottom guard plate is still insufficient, especially in the long-term use in high humidity and high salt spray environment, the battery pack bottom guard plate is prone to corrosion. UTILITY MODEL CONTENTS

[0008] The utility model aims at providing a battery pack bottom guard plate, battery pack and vehicle to reduce or eliminate at least one of the above technical problems.

[0009] The utility model discloses a battery pack bottom guard plate, including first fiber reinforced polymer layer, intermediate layer and second fiber reinforced polymer layer from top to bottom are set gradually, the intermediate layer includes the fiber reinforced polymer frame that is provided with the cooperation through -hole and the metal sheet that cooperates with cooperation through -hole, the upper side of metal sheet is combined with the downside of first fiber reinforced polymer layer, the downside of metal sheet is combined with the upside of second fiber reinforced polymer layer, the upside of fiber reinforced polymer frame is contacted or gap setting with the downside of first fiber reinforced polymer layer, the downside of fiber reinforced polymer frame is contacted or gap setting with the upside of second fiber reinforced polymer layer.

[0010] Optionally, the first fiber reinforced polymer layer is provided with a first hole, the fiber reinforced polymer frame is provided with a second hole corresponding to the first hole, and the second fiber reinforced polymer layer is provided with a third hole corresponding to the second hole, and the first hole, the second hole and the third hole constitute a first connecting through hole for connecting with the battery pack body.

[0011] Optionally, the first fiber reinforced polymer layer includes a first flange and a first plate body sunken downward relative to the first flange, the first hole is arranged on the first flange, the fiber reinforced polymer frame includes a second flange and a second plate body sunken downward relative to the second flange, the cooperation through hole is arranged on the second plate body, the second hole is arranged on the second flange, and the second fiber reinforced polymer layer includes a third flange and a third plate body sunken downward relative to the third flange, and the third hole is arranged on the third flange.

[0012] Optionally, the first flange is provided with a first recess sunken downward, the second flange is provided with a second recess matched with the first recess, and the third flange is provided with a third recess matched with the second recess.

[0013] Optionally, the first plate body is provided with a first protrusion protruding upward, the second plate body is provided with a second protrusion matched with the first protrusion, and the third plate body is provided with a third protrusion matched with the second protrusion.

[0014] Optionally, the first plate body is provided with a fourth hole, the second plate body is provided with a fifth hole corresponding to the fourth hole, and the third plate body is provided with a sixth hole corresponding to the fifth hole, and the fourth hole, the fifth hole and the sixth hole constitute a second connecting through hole.

[0015] Optionally, the upper side of the metal plate and the lower side of the first fiber reinforced polymer layer are combined with each other by means of hot-pressing bonding with adhesive film, and the lower side of the metal plate and the upper side of the second fiber reinforced polymer layer are combined with each other by means of hot-pressing bonding with adhesive film.

[0016] Optionally, the metal plate is a steel plate.

[0017] Optionally, the upper side of the first fiber reinforced polymer layer is combined with a metal strip.

[0018] Optionally, the metal strip and the first fiber reinforced polymer layer are combined with each other by means of hot-pressing bonding with adhesive film.

[0019] Optionally, the metal strip is an extrusion molding.

[0020] Optionally, the lower side of the second fiber reinforced polymer layer is covered with an anticorrosive coating, and the anticorrosive coating is a polymer coating.

[0021] The utility model also proposes a battery pack, including battery pack body and above any one described battery pack bottom guard board, the battery pack bottom guard board is fixedly connected in the lower side of battery pack body through fastener, the fastener passes through first fiber reinforced polymer layer, fiber reinforced polymer surrounds frame and second fiber reinforced polymer layer, to fasten the first fiber reinforced polymer layer, fiber reinforced polymer surrounds frame and second fiber reinforced polymer layer and connect on battery pack body.

[0022] The utility model also proposes a vehicle, including above any one described battery pack bottom guard board.

[0023] The utility model optimizes the multilayer composite structure of battery pack bottom guard board, has the characteristics of easy manufacture, improves the structural stability, durability, impact resistance, corrosion resistance and light weight level of battery pack bottom guard board. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 It is the explosion map of battery pack bottom guard board described in part embodiment;

[0025] Fig. 2 It is the partial sectional view of battery pack bottom guard board described in part embodiment;

[0026] Fig. 3 It is the structure schematic diagram of battery pack bottom guard board described in part embodiment.

[0027] In the figure, 1 - first fiber reinforced polymer layer, 2 - metal plate, 3 - fiber reinforced polymer frame, 4 - second fiber reinforced polymer layer, 5 - metal strip, 6 - anticorrosive coating, 101 - first flange, 102 - first plate part, 103 - first convex part, 104 - first hole, 105 - fourth hole, 301 - second flange, 302 - second plate part, 303 - fitting through hole, 304 - second convex part, 401 - third flange, 402 - third plate part, 403 - third convex part. DETAILED DESCRIPTION

[0028] Other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present application. The present application can also be implemented or applied in other different specific embodiments, and various modifications or changes can be made to the details in the present application based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, but not for limiting the protection scope of the present application.

[0029] It should be noted that the drawings provided in the following embodiments only schematically illustrate the basic concept of the present application, and only the components related to the present application are shown in the drawings, but not drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the layout pattern of the components can also be more complex.

[0030] As Figs. 1-3 A battery pack bottom guard plate shown in the figure includes a first fiber reinforced polymer layer 1, an intermediate layer and a second fiber reinforced polymer layer 4 arranged in sequence from top to bottom. The intermediate layer includes a fiber reinforced polymer frame 3 provided with a fitting through hole 303 and a metal plate 2 matched with the fitting through hole 303. The upper side of the metal plate 2 is combined with the lower side of the first fiber reinforced polymer layer 1, and the lower side of the metal plate 2 is combined with the upper side of the second fiber reinforced polymer layer 4. The upper side of the fiber reinforced polymer frame 3 is in contact with or gap arranged with the lower side of the first fiber reinforced polymer layer 1, and the lower side of the fiber reinforced polymer frame 3 is in contact with or gap arranged with the upper side of the second fiber reinforced polymer layer 4.

[0031] With the technical scheme, the metal plate 2 can provide rigid support, enhance the overall strength and impact resistance of the battery pack bottom guard. The first fiber reinforced polymer layer 1 and the second fiber reinforced polymer layer 4 form a sandwich structure, which can improve the corrosion resistance and impact resistance of the battery pack bottom guard. The fiber reinforced polymer frame 3 is arranged on the periphery of the metal plate 2, which protects the periphery of the metal plate 2, reduces the possibility of delamination or even falling between the metal plate 2 and the first fiber reinforced polymer layer 1 and between the metal plate 2 and the second fiber reinforced polymer layer 4, and improves the overall stability and durability of the battery pack bottom guard. Moreover, by arranging the fiber reinforced polymer frame 3, the amount of metal material is reduced, and the lightweight level of the battery pack bottom guard is improved.

[0032] In the above technical scheme, the upper side of the fiber reinforced polymer frame 3 is in contact with or gap arranged with the lower side of the first fiber reinforced polymer layer 1, and the lower side of the fiber reinforced polymer frame 3 is in contact with or gap arranged with the upper side of the second fiber reinforced polymer layer 4, that is, during the manufacture of the battery pack bottom guard, the first fiber reinforced polymer layer 1, the fiber reinforced polymer frame 3 and the second fiber reinforced polymer layer 4 can not be combined together, which can reduce the manufacturing difficulty of the battery pack bottom guard. When the battery pack bottom guard is assembled to the lower side of the battery pack body, the first fiber reinforced polymer layer 1, the fiber reinforced polymer frame 3 and the second fiber reinforced polymer layer 4 are fastened and connected to the battery pack body by using fasteners, that is, the first fiber reinforced polymer layer 1, the fiber reinforced polymer frame 3 and the second fiber reinforced polymer layer 4 are fastened and combined together.

[0033] As a specific example, the first fiber reinforced polymer layer 1 adopts carbon fiber reinforced resin composite material, with a thickness of 1-3mm, for enhancing the impact resistance and corrosion resistance of the battery pack bottom guard. The fiber reinforced polymer frame 3 adopts carbon fiber reinforced resin composite material, with a thickness of 1-2mm, for wrapping around the periphery of the metal plate 2, improving the stability and durability of the battery pack bottom guard. The second fiber reinforced polymer layer 4 adopts carbon fiber reinforced resin composite material, with a thickness of 1-3mm, for enhancing the corrosion resistance and impact resistance of the battery pack bottom guard.

[0034] In some embodiments, the first fiber reinforced polymer layer 1 is provided with a first hole 104, the fiber reinforced polymer frame 3 is provided with a second hole corresponding to the first hole 104, and the second fiber reinforced polymer layer 4 is provided with a third hole corresponding to the second hole, and the first hole 104, the second hole and the third hole constitute a first connecting through hole for connecting with the battery pack body. By using the above technical scheme, the first connecting through hole is used for cooperating with the fastener, which helps to reduce the assembly difficulty of the battery pack bottom guard plate. Moreover, through the cooperation between the metal plate 2 and the matching through hole 303, the position of the fiber reinforced polymer frame 3 can be limited, and the coaxiality of the first hole 104, the second hole and the third hole can be ensured.

[0035] In some embodiments, the first fiber reinforced polymer layer 1 includes a first flange 101 and a first plate body sunken downward relative to the first flange 101, the first hole 104 is arranged on the first flange 101, the fiber reinforced polymer frame 3 includes a second flange 301 and a second plate body sunken downward relative to the second flange 301, the matching through hole 303 is arranged on the second plate body, the second hole is arranged on the second flange 301, and the second fiber reinforced polymer layer 4 includes a third flange 401 and a third plate body sunken downward relative to the third flange 401, and the third hole is arranged on the third flange 401. By using the above technical scheme, by arranging the sunken first plate body, the sunken second plate body and the sunken third plate body, the structural strength of the battery pack bottom guard plate can be improved.

[0036] As a specific example, a plurality of first holes 104 are arranged on the first flange 101, a plurality of second holes are arranged on the second flange 301, and a plurality of third holes are arranged on the third flange 401.

[0037] In some embodiments, the first flange 101 is provided with a first recess sunken downward, the second flange 301 is provided with a second recess matched with the first recess, and the third flange 401 is provided with a third recess matched with the second recess. By using the above technical scheme, the arrangement of the first recess can improve the structural strength of the first flange 101, the arrangement of the second recess can improve the structural strength of the second flange 301, and the arrangement of the third recess can improve the structural strength of the third flange 401. By matching the first recess, the second recess and the third recess with each other, the position of the fiber reinforced polymer frame 3 can be limited.

[0038] In some embodiments, the first plate body is provided with a first protrusion 103 protruding upward, the second plate body is provided with a second protrusion 304 matched with the first protrusion 103, and the third plate body is provided with a third protrusion 403 matched with the second protrusion 304. By adopting the technical scheme, the first protrusion 103 can improve the structural strength of the first plate body, the second protrusion 304 can improve the structural strength of the second plate body, and the third protrusion 403 can improve the structural strength of the third plate body.

[0039] In some embodiments, the first plate body is provided with a fourth hole 105, the second plate body is provided with a fifth hole corresponding to the fourth hole 105, and the third plate body is provided with a sixth hole corresponding to the fifth hole, and the fourth hole 105, the fifth hole and the sixth hole constitute a second connecting through hole. By adopting the technical scheme, the second connecting through hole can be used to connect with the battery pack body, and the first plate body, the second plate body and the third plate body can be fixedly connected on the battery pack body by using a bolt matched with the second connecting through hole.

[0040] As a preferred example, the fourth hole 105 is arranged on the first protrusion 103, the fifth hole is arranged on the second protrusion 304, and the sixth hole is arranged on the third protrusion 403.

[0041] As a preferred example, the first protrusion 103 is a long strip-shaped boss structure with a length extending along the left-right direction, the first protrusion 103 divides the first plate body into two first plate portions 102, the second protrusion 304 is a long strip-shaped boss structure with a length extending along the left-right direction, the second protrusion 304 divides the second plate body into two second plate portions 302, and the third protrusion 403 is a long strip-shaped boss structure with a length extending along the left-right direction, the third protrusion 403 divides the third plate body into two third plate portions 402. Two second plate portions 302 are each provided with a matching through hole 303, and each of the two matching through holes 303 is matched with a metal plate 2, one metal plate 2 is combined between one first plate portion 102 and one third plate portion 402, and the other metal plate 2 is combined between the other first plate portion 102 and the other third plate portion 402. By adopting two metal plates 2 to form an intermediate layer, the characteristics of easy implementation are achieved, and convenience is provided for arranging the second connecting through hole.

[0042] In some embodiments, the upper side of the metal plate 2 and the lower side of the first fiber-reinforced polymer layer 1 are combined with each other by means of hot-pressing bonding of adhesive film, and the lower side of the metal plate 2 and the upper side of the second fiber-reinforced polymer layer 4 are combined with each other by means of hot-pressing bonding of adhesive film. By adopting hot-pressing bonding of adhesive film, firm combination between the first fiber-reinforced polymer layer 1 and the metal plate 2 and between the second fiber-reinforced polymer layer 4 and the metal plate 2 can be ensured.

[0043] In some embodiments, the metal plate 2 is a steel plate, such as a galvanized steel plate. The steel plate can provide sufficient rigid support, and in specific implementations, the thickness of the steel plate is 0.5-1 mm.

[0044] In some embodiments, the upper side of the first fiber-reinforced polymer layer 1 is combined with a metal strip 5. The metal strip 5 is used to provide structural support and connection fixation, and the metal strip 5 can enhance the impact resistance and structural stability of the battery pack bottom guard. In specific implementations, the upper side of the first fiber-reinforced polymer layer 1 can be combined with a plurality of metal strips 5.

[0045] In some embodiments, the lower side of the metal strip 5 is combined with the upper side of the first fiber-reinforced polymer layer 1 by means of hot-press bonding with adhesive film. With the above technical solution, hot-press bonding with adhesive film can ensure the firm combination between the metal strip 5 and the first fiber-reinforced polymer layer 1.

[0046] In some embodiments, the metal strip 5 is an extruded member, which has good mechanical properties and can meet the strengthening requirements of the battery pack bottom guard. For example, the metal strip 5 is an aluminum alloy extruded member. As a specific example, the metal strip 5 is made of high-strength aluminum alloy extrusion, and the thickness is 2-4 mm.

[0047] In some embodiments, the lower side of the second fiber-reinforced polymer layer 4 is covered with a corrosion-resistant coating 6, which is a polymer coating. The polymer coating on the lower side of the second fiber-reinforced polymer layer 4 can provide a layer of corrosion protection and improve the corrosion resistance of the battery pack bottom guard in high-humidity and high-salt-fog environments. In specific implementations, the polymer coating can be an epoxy resin coating or a polyurethane coating, and the thickness is 0.1-0.3 mm.

[0048] In the manufacture of the above-mentioned battery pack bottom guard, hot-press bonding with adhesive film is used between the metal strip 5 and the first fiber-reinforced polymer layer 1, between the metal plate 2 and the first fiber-reinforced polymer layer 1, and between the metal plate 2 and the second fiber-reinforced polymer layer 4. After multi-layer compounding, the whole is bolted to the box body of the battery pack body to form a protective structure on the lower side of the battery pack body.

[0049] The utility model discloses still proposed a kind of battery pack, including battery pack body and the battery pack bottom guard plate described in any one of above, battery pack bottom guard plate is fixedly connected in the downside of battery pack body by fastener, fastener passes through first fiber reinforced polymer layer 1, fiber reinforced polymer surrounding frame 3 and second fiber reinforced polymer layer 4, to first fiber reinforced polymer layer 1, fiber reinforced polymer surrounding frame 3 and second fiber reinforced polymer layer 4 fastening connection on battery pack body.Adopt above-mentioned technical scheme, battery pack bottom guard plate can strengthen the protection of battery pack bottom.Utilize fastener to fasten connection first fiber reinforced polymer layer 1, fiber reinforced polymer surrounding frame 3 and second fiber reinforced polymer layer 4 on battery pack body, reduce the manufacturing difficulty of battery pack bottom guard plate, with the characteristics of easy to realize.

[0050] In specific implementation, fastener can select bolt, and battery pack bottom guard plate is fixedly connected in the downside of the box of battery pack body by multiple bolts.Further, multiple first connecting through holes are provided on battery pack bottom guard plate, and the multiple first connecting through holes are respectively used for cooperating with multiple bolts.

[0051] The utility model discloses still proposed a kind of vehicle, including the battery pack bottom guard plate described in any one of above.

[0052] The above embodiments are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited to this.Equivalent substitution or transformation of the technical personnel in this technical field on the basis of the utility model is all within the protection scope of the utility model.In the description of the present specification, the description of reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics combined with the embodiment or example are contained in at least one embodiment or example of the utility model.In the present specification, the illustrative description of the above terms is not necessarily for the same embodiment or example.Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way.In addition, the technical personnel in this field can combine and combine different embodiments or examples described in the present specification.

[0053] In the description of the utility model, it is understood that the orientation indicated by terms "upper", "lower", "front", "rear", "left", "right" and the like is the orientation represented based on the coordinate system in the accompanying drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. Fig. 1 In the description of the utility model, it is understood that the orientation indicated by terms "upper", "lower", "front", "rear", "left", "right" and the like is the orientation represented based on the coordinate system in the accompanying drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.

Claims

1. A battery pack bottom protective plate, characterized in that, The material includes a first fiber-reinforced polymer layer (1), an intermediate layer, and a second fiber-reinforced polymer layer (4) arranged sequentially from top to bottom. The intermediate layer includes a fiber-reinforced polymer frame (3) with a mating through hole (303) and a metal plate (2) that mates with the mating through hole (303). The upper side of the metal plate (2) is connected to the lower side of the first fiber-reinforced polymer layer (1), and the lower side of the metal plate (2) is connected to the upper side of the second fiber-reinforced polymer layer (4). The upper side of the fiber-reinforced polymer frame (3) is in contact with or has a gap with the lower side of the first fiber-reinforced polymer layer (1), and the lower side of the fiber-reinforced polymer frame (3) is in contact with or has a gap with the upper side of the second fiber-reinforced polymer layer (4).

2. The battery pack bottom protective plate according to claim 1, characterized in that, The first fiber-reinforced polymer layer (1) is provided with a first hole (104), the fiber-reinforced polymer frame (3) is provided with a second hole corresponding to the first hole (104), and the second fiber-reinforced polymer layer (4) is provided with a third hole corresponding to the second hole. The first hole (104), the second hole and the third hole constitute a first connection through hole for connecting with the battery pack body.

3. The battery pack bottom protective plate according to claim 2, characterized in that, The first fiber-reinforced polymer layer (1) includes a first flange edge (101) and a first plate body that is recessed relative to the first flange edge (101), and the first hole (104) is disposed on the first flange edge (101). The fiber-reinforced polymer frame (3) includes a second flange edge (301) and a second plate body that is recessed relative to the second flange edge (301). The mating through hole (303) is disposed on the second plate body, and the second hole is disposed on the second flange edge (301). The second fiber-reinforced polymer layer (4) includes a third flange edge (401) and a third plate body that is recessed relative to the third flange edge (401). The third hole is disposed on the third flange edge (401).

4. The battery pack bottom protective plate according to claim 3, characterized in that, The first flange edge (101) is provided with a first recessed portion that is recessed downwards, the second flange edge (301) is provided with a second recessed portion that matches the first recessed portion, and the third flange edge (401) is provided with a third recessed portion that matches the second recessed portion. And / or, the first plate is provided with an upwardly protruding first protrusion (103), the second plate is provided with a second protrusion (304) that matches the first protrusion (103), and the third plate is provided with a third protrusion (403) that matches the second protrusion (304). And / or, the first plate is provided with a fourth hole (105), the second plate is provided with a fifth hole corresponding to the fourth hole (105), and the third plate is provided with a sixth hole corresponding to the fifth hole. The fourth hole (105), the fifth hole and the sixth hole constitute a second connecting through hole.

5. The battery pack bottom protective plate according to claim 1, characterized in that, The upper side of the metal plate (2) is bonded to the lower side of the first fiber-reinforced polymer layer (1) by means of hot-pressing adhesive film bonding, and the lower side of the metal plate (2) is bonded to the upper side of the second fiber-reinforced polymer layer (4) by means of hot-pressing adhesive film bonding. And / or, the metal plate (2) is a steel plate.

6. The battery pack bottom protective plate according to claim 1, characterized in that, A metal strip (5) is bonded to the upper side of the first fiber-reinforced polymer layer (1).

7. The battery pack bottom protective plate according to claim 6, characterized in that, The metal strip (5) and the first fiber-reinforced polymer layer (1) are bonded together by hot pressing of an adhesive film; And / or, the metal strip (5) is an extruded part.

8. The battery pack bottom protective plate according to claim 1, characterized in that, The lower side of the second fiber-reinforced polymer layer (4) is covered with an anti-corrosion coating (6), which is a polymer coating.

9. A battery pack, characterized in that, The battery pack includes a battery pack body and a battery pack bottom protector as described in any one of claims 1-8. The battery pack bottom protector is fixedly connected to the lower side of the battery pack body by fasteners. The fasteners pass through the first fiber-reinforced polymer layer (1), the fiber-reinforced polymer frame (3), and the second fiber-reinforced polymer layer (4) to securely connect the first fiber-reinforced polymer layer (1), the fiber-reinforced polymer frame (3), and the second fiber-reinforced polymer layer (4) to the battery pack body.

10. A vehicle, characterized in that, Includes the battery pack bottom protection plate as described in any one of claims 1-8.

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