Protective plate, battery pack and vehicle

Abstract

The utility model provides a protection plate, a battery pack and a vehicle, and relates to the field of battery pack protection. The protection plate comprises a first fiber reinforced resin layer, a metal honeycomb layer, a second fiber reinforced resin layer, a metal plate and a PVC coating which are arranged in a stacked mode. The protection plate has the advantages of light weight, small thickness, better impact resistance, better thermal runaway performance and the like, not only can be used as the protection plate at the bottom of the battery pack to protect a battery assembly and preserve heat, but also can enhance the overall rigidity of a vehicle when the battery pack comprising the protection plate is used in the vehicle, and the service life of the vehicle is prolonged. The stability and safety of the vehicle in the running process are improved, and meanwhile the lightweight design is beneficial to improving the energy utilization efficiency, reducing energy consumption and increasing the endurance mileage of the vehicle.

Description

Technical Field

[0001] This application relates to the field of battery pack protection, and more particularly, to a protection plate, a battery pack, and a vehicle. Background Art

[0002] With the occurrence of safety incidents caused by the breakdown of some battery bottoms and the attention of the country and the industry to battery safety, currently, major new energy vehicle manufacturers are researching protection solutions for the battery bottoms.

[0003] Currently, new energy vehicles on the market have added protection plates for the safety protection of the battery bottoms. However, the protection plates on the market currently have problems such as heavy weight, large thickness, poor anti-impact effect, and large required reserved space. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a protection plate, a battery pack, and a vehicle. The protection plate takes into account light weight, thin thickness, good anti-impact effect, good thermal runaway performance, etc. It can not only serve as a protection plate at the bottom of the battery pack to protect the battery components and keep warm, but also when the battery pack including it is used in a vehicle, it can improve the stability and safety of the vehicle during driving.

[0005] In a first aspect, the embodiments of this application provide a protection plate, which includes a first fiber-reinforced resin layer, a metal honeycomb layer, a second fiber-reinforced resin layer, a metal plate, and a PVC coating that are stacked.

[0006] The protection plate provided by this application takes into account light weight, thin thickness, good anti-impact effect, good thermal runaway performance, etc. It can not only serve as a protection plate at the bottom of the battery pack to bear the role of resisting impact deformation, prevent external impact force from directly acting on the battery cell components of the battery pack, and play a role in protecting the battery components and keeping warm, but also when the battery pack including the above protection plate is used in a vehicle, it can enhance the overall stiffness of the vehicle, improve the stability and safety of the vehicle during driving. At the same time, the lightweight design also helps to improve energy utilization efficiency, reduce energy consumption, and increase the vehicle's cruising range.

[0007] In a possible implementation, the thickness of the metal honeycomb layer is 2-4 times the total thickness of the first fiber-reinforced resin layer and the second fiber-reinforced resin layer.

[0008] In the above implementation process, by controlling the ratio of the thickness of the metal honeycomb layer to the total thickness of the first fiber-reinforced resin layer and the second fiber-reinforced resin layer within the above range, it is beneficial for the protection plate to take into account high impact resistance strength, toughness, corrosion resistance, etc.

[0009] In a possible implementation, the thickness of the metal honeycomb layer is 4 - 8 mm, and the total thickness of the first fiber-reinforced resin layer and the second fiber-reinforced resin layer is 2 - 3 mm.

[0010] In the above implementation process, the metal honeycomb layer with an appropriate thickness, as well as the first fiber-reinforced resin layer and the second fiber-reinforced resin layer, can not only ensure that the metal honeycomb layer can fully play the role of buffering and dispersing external forces, effectively reduce the weight of the overall protection plate, but also help improve the flame retardancy and thermal runaway prevention performance of the protection plate.

[0011] In a possible implementation, the thickness of the first fiber-reinforced resin layer is the same as that of the second fiber-reinforced resin layer.

[0012] In the above implementation process, the setting with the same thickness is beneficial to improving the performance of the protection plate.

[0013] In a possible implementation, the metal plate is a steel plate, and a galvanized layer, a zinc-iron alloy galvanized layer or an electrophoretic paint protective layer is provided on the outer surface of the steel plate.

[0014] In the above implementation process, the above setting is beneficial to improving the protection effect of the protective layer on the battery pack.

[0015] In a possible implementation, the thickness of the metal plate is 1 - 1.5 mm.

[0016] In the above implementation process, controlling the thickness of the metal plate within the above range is beneficial for it to play a good supporting role and bear part of the impact / squeezing force brought by foreign objects such as stones.

[0017] In a possible implementation, the thickness of the PVC coating is 1 - 1.5 mm.

[0018] In the above implementation process, controlling the thickness of the PVC coating within the above range has a good anti-stone impact effect.

[0019] In a possible implementation, the metal honeycomb layer is an aluminum honeycomb layer.

[0020] In the above implementation process, the aluminum honeycomb layer not only has a lower density, which is beneficial to ensuring the lightweight of the overall protection plate, but also has good mechanical strength.

[0021] In a second aspect, an embodiment of the present application provides a battery pack, which includes: a battery cell assembly, a tray, and the protection plate provided in the first aspect of the present application. The tray supports the battery cell assembly, the protection plate is installed on the side of the tray facing away from the battery cell assembly, and the first fiber-reinforced resin layer is located on the side of the metal plate close to the tray.

[0022] In a third aspect, an embodiment of the present application provides a vehicle, which is equipped with the battery pack provided in the second aspect of the present application or the protective plate provided in the first aspect. Description of the Drawings

[0023] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the protective plate provided by the present application.

[0025] Reference numerals: 100 - protective plate; 11 - first fiber - reinforced resin layer; 12 - metal honeycomb layer; 13 - second fiber - reinforced resin layer; 14 - metal plate; 15 - PVC coating. Detailed Embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0028] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of the present application, it should be noted that the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0031] A vehicle is provided with a protective plate. The protective plate can be part of the battery pack or directly part of the vehicle chassis. When it is part of the vehicle chassis, the aerodynamic performance of the vehicle can be improved through shape design, reducing wind resistance, thereby indirectly improving the energy efficiency and endurance of the vehicle.

[0032] In some embodiments, the protective plate is part of the battery pack. Specifically, the vehicle is equipped with a battery pack, and the battery pack can be fixed to the bottom of the vehicle body using the battery pack.

[0033] Among them, the battery pack can include a tray, a battery cell assembly installed on the tray, and a protective plate. The tray supports the battery cell assembly. The protective plate is installed on the side of the tray facing away from the battery cell assembly, that is, the protective plate is installed below the tray. When the vehicle is in motion and the bottom of the vehicle body is impacted and squeezed by hard objects such as stones, the protective plate located at the bottom of the battery pack can bear the role of resisting impact deformation, preventing the external impact force from directly acting on the battery cell assembly of the battery pack, and playing a role in protecting the battery.

[0034] Please refer to Figure 1 , the protective plate 100 includes a first fiber-reinforced resin layer 11, a metal honeycomb layer 12, a second fiber-reinforced resin layer 13, a metal plate 14, and a PVC coating 15 which are stacked.

[0035] It should be noted that when the protective plate 100 is installed on the tray at the bottom of the battery pack, the first fiber-reinforced resin layer 11 is located on the side of the metal plate 14 close to the tray.

[0036] Among them, the metal honeycomb layer 12 not only has the advantages of light weight, high stiffness, and high fire protection level. Therefore, introducing it can greatly reduce the weight and thickness of the overall protective plate 100 and improve the fire protection level. At the same time, the metal honeycomb layer 12 can withstand the transverse shear force of the protective plate 100, and the metal honeycomb layer 12 has the characteristics of stable buffer load, strong and controllable absorption ability, which can improve the ability of the protective plate 100 to resist impact deformation and improve the utilization rate of the reserved buffer space at the bottom of the battery pack tray.

[0037] The first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 are attached to both sides of the metal honeycomb layer 12 and can withstand the tensile and compressive stresses distributed on two opposite outer surfaces when the protective plate 100 is bent. This arrangement enables the protective plate 100 to have the advantages of light weight and high strength, and also has a good heat insulation function, effectively maintaining the temperature of the battery pack constant. Combined with the metal plate 14, it can give full play to the anti-impact performance advantage, and has the advantages of simple structure, high assembly efficiency, excellent anti-impact ability, good heat insulation performance, significant weight reduction, protection of key vehicle components, improvement of safety, and extension of vehicle service life, etc.

[0038] It can be understood that the first fiber-reinforced resin layer 11 is stably connected to the metal honeycomb layer 12 through the resin therein. Similarly, the second fiber-reinforced resin layer 13 is stably connected to the metal honeycomb layer 12 through the resin therein.

[0039] The metal plate 14 has the functions of anti-impact and support, and can effectively improve the anti-impact ability of the protective plate 100. The PVC coating 15 can effectively resist stone impact. Therefore, the composite layer of the first fiber-reinforced resin layer 11, the metal honeycomb layer 12, and the second fiber-reinforced resin layer 13 is arranged on the side of the metal plate 14 close to the tray, and the PVC coating 15 is located on the side of the metal plate 14 away from the tray. It not only has the functions of flame retardancy and prevention of thermal runaway, but also takes into account a better service life and excellent anti-impact effect. At the same time, through the introduction of the first fiber-reinforced resin layer 11, the metal honeycomb layer 12, the second fiber-reinforced resin layer 13, and the PVC coating 15, it is beneficial for the protective plate 100 to take into account the advantages of light weight and thin thickness on the premise of excellent anti-impact effect, improve the utilization rate of the buffer space under the tray of the battery pack, optimize the energy density of the battery pack by improving the utilization rate of the buffer space under the tray, not only increase the cruising range, reduce the vehicle cost, but also optimize the interior space layout of the vehicle, make the passenger compartment more spacious, and improve the riding comfort.

[0040] In summary, the protective plate 100 provided by the present application takes into account the advantages of light weight, thin thickness, good anti-impact effect, and good thermal runaway performance, etc. It can not only act as a protective plate 100 at the bottom of the battery pack to bear the role of resisting impact deformation, avoid the direct action of external impact force on the battery cell components of the battery pack, and play the role of protecting the battery components and heat insulation, but also when the battery pack including the above-mentioned protective plate 100 is used in a vehicle, it can enhance the overall stiffness of the vehicle, improve the stability and safety of the vehicle during driving, and at the same time, the lightweight design also helps to improve the energy utilization efficiency, reduce energy consumption, and increase the vehicle cruising range.

[0041] Among them, the composition components of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 independently include reinforcing fibers and resin, thus ensuring the stiffness and toughness of the protection plate 100. Among them, the reinforcing fibers include one or more of glass fibers or carbon fibers, etc. The resin may include, but is not limited to, one or more of polypropylene resin, nylon resin, phenolic resin, epoxy resin, polyurethane, etc.

[0042] Exemplarily, the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 can independently be a glass fiber-reinforced resin layer or a carbon fiber-reinforced resin layer.

[0043] That is to say, the components of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 can be the same or different.

[0044] In some embodiments, both the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 are glass fiber-reinforced polyurethane layers.

[0045] In this application, the metal honeycomb layer 12 has a plurality of through holes, and the plurality of through holes can be formed into a honeycomb structure. Among them, the cross-section of each through hole can be a polygon such as a hexagon or a triangle, or a circle. Exemplarily, the density of the metal honeycomb layer 12 can be 0.1-0.33 g / cm 3 . The metal honeycomb layer 12 with a lower density is beneficial to ensuring the light weight of the overall protection plate 100, as well as the excellent energy absorption characteristics and mechanical strength of the metal honeycomb layer 12.

[0046] In some embodiments of this application, the metal honeycomb layer 12 can specifically be an aluminum honeycomb layer. It not only has a lower density, which is beneficial to ensuring the light weight of the overall protection plate 100, but also has good mechanical strength.

[0047] In some embodiments of this application, the thickness of the metal honeycomb layer 12 is 2-4 times the total thickness of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13.

[0048] By controlling the ratio of the thickness of the metal honeycomb layer 12 to the total thickness of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 within the above range, it is beneficial for the protection plate 100 to balance high impact resistance strength, toughness, corrosion resistance, etc.

[0049] Exemplarily, the thickness of the metal honeycomb layer 12 is any value among 2.0, 2.3, 2.5, 2.8, 3.0, 3.3, 3.5, 3.8, 4.0 times the total thickness of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 or between any two values.

[0050] In some embodiments, the thickness of the metal honeycomb layer 12 is 4-8 mm, and the total thickness of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 is 2-3 mm.

[0051] The metal honeycomb layer 12 with an appropriate thickness, as well as the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13, can not only ensure that the metal honeycomb layer 12 can fully play the role of buffering and dispersing external forces, effectively reduce the weight of the overall protection plate 100, but also help improve the flame retardancy and thermal runaway prevention performance of the protection plate 100.

[0052] Exemplarily, the total thickness of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 is any value among 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3.0 mm or between any two values.

[0053] Exemplarily, the thickness of the metal honeycomb layer 12 is any value among 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, 6.5 mm, 7.0 mm, 8.0 mm or between any two values.

[0054] In some embodiments, the total thickness of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 is 2 mm. At this time, the corresponding thickness of the metal honeycomb layer 12 is 4-8 mm. At this time, the total thickness of the first fiber-reinforced resin layer 11, the metal honeycomb layer 12, and the second fiber-reinforced resin layer 13 is 6-10 mm.

[0055] Among them, the thicknesses of the first fiber-reinforced resin layer 11 and the second fiber-reinforced resin layer 13 can be the same or different. The thickness of the first fiber-reinforced resin layer 11 can be greater than or less than the thickness of the second fiber-reinforced resin layer 13.

[0056] Please refer to Figure 1 , in some embodiments, the thickness of the first fiber-reinforced resin layer 11 is the same as the thickness of the second fiber-reinforced resin layer 13.

[0057] The setting method with the same thickness is beneficial to uniform force on both sides and helps improve the performance of the protection plate 100.

[0058] The material of the metal plate 14 may include, but is not limited to, at least one of aluminum, aluminum alloy, magnesium, magnesium alloy, and steel.

[0059] In some embodiments, the metal plate 14 is a steel plate, and a galvanized layer, a zinc-iron alloy galvanized layer, or an electrophoretic paint protection layer is provided on the outer surface of the steel plate.

[0060] Compared with other metal materials, using a steel plate as the metal plate 14 has better tensile strength and elongation, can meet the requirements of impact resistance, and is conducive to improving the protection of the battery pack.

[0061] A galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protective layer is provided on the outer surface of the steel plate to improve the corrosion resistance of the steel plate. When the second fiber-reinforced resin layer 13 or the PVC coating 15 is damaged, the galvanic cell effect formed by the galvanized layer or the galvanized iron alloy layer and the steel plate causes the galvanized layer or the galvanized iron alloy layer to corrode preferentially to the steel plate, thereby protecting the steel plate, and the electrophoretic paint protective layer has good adhesion and can effectively isolate the steel plate from the external environment.

[0062] In some embodiments, the thickness of the metal plate 14 is 1 - 1.5 mm.

[0063] Controlling the thickness of the metal plate 14 within the above range is beneficial for it to play a good supporting role and bear part of the impact / squeezing force brought by foreign objects such as stones.

[0064] Exemplarily, the thickness of the metal plate 14 is any value of 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm or between any two values.

[0065] The PVC coating 15 is obtained by coating the metal plate 14 with PVC paint, which can effectively resist stone impact. And the PVC coating 15 can stably adhere to the metal plate 14, which is beneficial to extending the stone impact resistance performance and the service life of the protection plate 100.

[0066] In some embodiments, the thickness of the PVC coating 15 is 1 - 1.5 mm.

[0067] Controlling the thickness of the PVC coating 15 within the above range has a good stone impact resistance effect.

[0068] Exemplarily, the thickness of the PVC coating 15 is any value of 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm or between any two values.

[0069] In summary, the protection plate provided by the present application takes into account features such as light weight, thin thickness, good impact resistance effect and good thermal runaway performance. It can not only serve as the protection plate at the bottom of the battery pack to bear the role of resisting impact deformation, avoid the direct action of external impact force on the battery cell assembly of the battery pack, and play a role in protecting the battery assembly and heat preservation, but also when the battery pack including the above protection plate is used in a vehicle, it can enhance the overall stiffness of the vehicle and improve the stability and safety of the vehicle during driving.

[0070] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A protective plate, characterized in that: The invention comprises a first fiber-reinforced resin layer, a metal honeycomb layer, a second fiber-reinforced resin layer, a metal plate and a PVC coating layer which are stacked.

2. The protective plate according to claim 1, characterized in that: The thickness of the metal honeycomb layer is 2-4 times the total thickness of the first fiber-reinforced resin layer and the second fiber-reinforced resin layer.

3. The protective plate according to claim 2, characterized in that: The thickness of the metal honeycomb layer is 4-8 mm, and the total thickness of the first fiber-reinforced resin layer and the second fiber-reinforced resin layer is 2-3 mm.

4. The protective plate according to claim 1, characterized in that: The thickness of the first fiber-reinforced resin layer is the same as the thickness of the second fiber-reinforced resin layer.

5. The protective plate according to claim 1, characterized in that: The metal plate is a steel plate, and the outer surface of the steel plate is provided with a galvanized layer, a galvanized iron alloy layer or an electrophoretic paint protective layer.

6. The protective plate according to claim 1, characterized in that: The thickness of the metal plate is 1-1.5 mm.

7. The protective plate according to claim 1, characterized in that: The thickness of the PVC coating is 1-1.5 mm.

8. The protective plate according to claim 1, characterized in that: The metal honeycomb layer is an aluminum honeycomb layer.

9. A battery pack, characterized in that: The battery pack includes: a battery cell assembly, a tray and a protective plate as described in any one of claims 1-8, the tray supports the battery cell assembly, the protective plate is installed on a side of the tray away from the battery cell assembly, and the first fiber reinforced resin layer is located on a side of the metal plate close to the tray.

10. A vehicle, characterized in that: The vehicle is provided with a battery pack as claimed in claim 9 or a protective plate as claimed in any one of claims 1 to 8.

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