Power battery bottom plate, power battery pack and vehicle

Abstract

The embodiment of the utility model relates to a power battery bottom plate, a power battery pack and a vehicle. The power battery bottom plate comprises a supporting layer, a buffer energy absorption part and a packaging layer, the supporting layer is provided with a first surface and a second surface which are opposite, the supporting layer is further provided with a plurality of supporting holes, and the supporting holes penetrate through the first surface. And the buffering energy-absorbing part is accommodated in the plurality of supporting holes. The packaging layer is arranged on the surface of the supporting layer to seal the supporting hole. The power battery bottom plate has the advantage of light weight.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a power battery base plate. Background Art

[0002] Generally, the main function of the power battery bottom guard plate of an electric vehicle is to protect the power battery pack of the vehicle from the invasion of foreign objects (stones, water, mud, sand and other foreign objects). At the same time, the bottom guard plate also needs to meet the performance requirements of fire resistance and impact resistance.

[0003] The bottom guard plate material needs to have high impact resistance and certain fire resistance. Based on the above requirements, most traditional power battery bottom guard plates choose a one-piece solid steel plate and a coating structure. The thickness of the one-piece solid steel plate determines the bottom protection performance of the power battery bottom guard plate. The overall weight of the power battery bottom guard plate of electric vehicles in the prior art is heavy, which is not conducive to product lightweighting. Utility Model Content

[0004] Embodiments of the present application provide a power battery base plate, a power battery pack, and a vehicle.

[0005] In the first aspect, the embodiment of the present application provides a power battery bottom plate, including a support layer, a buffer energy absorption part and an encapsulation layer. The support layer has a first surface and a second surface opposite to each other, and the support layer is also provided with a plurality of support holes, and the support holes penetrate the first surface. The buffer energy absorption part is accommodated in the plurality of support holes. The encapsulation layer is arranged on the surface of the support layer to close the support holes.

[0006] In some optional examples, the support layer includes at least one of the following structures: an aluminum honeycomb panel, a polypropylene honeycomb panel, and a polypropylene porous panel.

[0007] In some optional examples, the thickness of the support layer is greater than or equal to 5 mm and less than or equal to 12 mm.

[0008] In some optional examples, the support layer includes an aluminum honeycomb panel, and the wall thickness of the honeycomb unit of the aluminum honeycomb panel is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0009] In some optional examples, the support layer includes a plurality of aluminum honeycomb panels, and the plurality of aluminum honeycomb panels are stacked along the radial direction of the support hole.

[0010] In some optional examples, the support layer further includes a support aluminum plate, and the support aluminum plate is disposed between two adjacent aluminum honeycomb panels.

[0011] In some optional examples, the buffering and energy absorbing part includes at least one of the following structures: a polystyrene foam filler, a polyurethane foam filler, a polyethylene foam filler, and a hard polyurethane foam filler.

[0012] In some optional examples, the buffer energy-absorbing portion is filled in the support hole to form an energy-absorbing support layer together with the support layer.

[0013] In some optional examples, the support hole also passes through the second surface, and two packaging layers are provided, and the two packaging layers are respectively provided on the first surface and the second surface to close the support hole.

[0014] In some optional examples, the packaging layer is a glass fiber board, and the glass fiber board is connected to the support layer through a hot pressing process.

[0015] In some optional examples, the thickness of the fiberglass board is greater than or equal to 1 mm and less than or equal to 3 mm.

[0016] In a second aspect, an embodiment of the present application further provides a power battery pack, comprising a box body, a power battery base plate of any one of the above items, and a battery module, wherein the power battery base plate is arranged in the box body of the buffer energy absorption part, and the battery module is arranged in the box body of the buffer energy absorption part and is located on the power battery base plate of the buffer energy absorption part.

[0017] In a third aspect, an embodiment of the present application further provides a vehicle, comprising a vehicle body and the above-mentioned power battery pack, wherein the power battery pack is disposed in the vehicle body.

[0018] Compared with the prior art, in the power battery bottom plate provided by the embodiment of the present application, the setting of the support holes enables the support layer to have good supporting capacity and can be responsible for the transmission of rigid energy well. The buffering energy-absorbing part is accommodated in the support hole, which greatly improves the energy absorption effect of the power battery bottom plate, and can also play a buffering role under gravity impact, further enhancing protection. The encapsulation layer is arranged on the surface of the support layer, which further improves the structural strength of the power battery bottom plate. The power battery bottom plate provided by the embodiment of the present application combines the buffering energy-absorbing part with the support layer with support holes, which significantly improves the protection performance of the power battery bottom plate. Compared with the traditional power battery bottom plate using steel plates, under the energy absorption requirements required by the same protection level, the power battery bottom plate provided by the embodiment of the present application has a lighter weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the structure of a transportation vehicle provided in one embodiment of the present application.

[0021] Figure 2It is a simplified structural schematic diagram of a power battery pack provided in one embodiment of the present application.

[0022] Figure 3 It is a structural schematic diagram of a power battery base plate provided in one embodiment of the present application.

[0023] Figure 4 yes Figure 3 Schematic diagram of the exploded structure of the power battery base plate shown.

[0024] Figure 5 yes Figure 3 A schematic cross-sectional structure diagram of another embodiment of the support layer of the power battery bottom plate is shown.

[0025] Figure 6 yes Figure 3 A schematic cross-sectional structure diagram of another embodiment of the support layer of the power battery bottom plate is shown.

[0026] Figure 7 yes Figure 3 The cross-sectional structure diagram of the support layer of the power battery bottom plate is shown.

[0027] Figure numbers: 100, power battery bottom plate; 10, support layer; 12, first surface; 13, support hole; 14, second surface; 16, aluminum honeycomb panel; 18, support aluminum plate; 30, buffer energy absorption part; 32, energy absorption support layer; 50, packaging layer; 52, fiberglass board; 200, power battery pack; 201, box; 203, battery module; 300, vehicle; 301, vehicle body; 303, chassis. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present application, 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 only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0029] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. The specification and claims do not use differences in names as a way to distinguish components, but use differences in components' functions as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to"; "substantially" means that those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0030] Please also see Figure 1 and Figure 2 The embodiment of the present application provides a power battery pack 200 and a vehicle 300 equipped with the power battery pack 200. The present specification does not limit the specific type of the vehicle 300. For example, the vehicle 300 may be an airplane, a flying car, or a car. In the present embodiment, the vehicle 300 is a car.

[0031] This specification does not limit the specific structure of the vehicle 300. As an example, the vehicle 300 may include a body 301, a chassis 303 and the above-mentioned power battery pack 200. The chassis 303 is arranged on a side of the body 301 close to the parking platform when the body 301 is parked, and the power battery pack 200 may be arranged on the chassis 303.

[0032] In this embodiment, the power battery pack 200 may include a box body 201, a power battery bottom plate 100, and a plurality of battery modules 203. The power battery bottom plate 100 is placed at the bottom of the box body 201, and the plurality of battery modules 203 are accommodated in the battery box 10 and placed on the power battery bottom plate 100. The box body 201 and the power battery bottom plate 100 provide protection for the battery modules 203, and the box body 201 may be implemented in the form of sheet metal or profiles.

[0033] Please also see Figure 3 and Figure 4 In this embodiment, the power battery bottom plate 100 may include a support layer 10, a buffering energy absorbing portion 30, and an encapsulation layer 50. The support layer 10 has a first surface 12 and a second surface 14 opposite to each other. The support layer 10 may also be provided with support holes 13, and the support holes 13 penetrate the first surface 12 along the thickness direction of the support layer 10. The buffering energy absorbing portion 30 is accommodated in a plurality of support holes 13. The encapsulation layer 50 is disposed on the first surface 12 of the support layer 10 to close the support holes 13.

[0034] The setting of the support hole 13 makes the whole plate of the support layer 10 lighter than the solid metal plate, which is conducive to the lightweight of the product. At the same time, it has high strength and rigidity, and can be responsible for the transmission of rigid energy well. The buffer energy absorption part 30 is accommodated in the support hole 13, which greatly improves the energy absorption effect of the power battery bottom plate 100, and can also play a buffering role under gravity impact, further enhancing protection; the encapsulation layer 50 is arranged on the surface of the support layer 10, which further improves the structural strength of the power battery bottom plate 100. The power battery bottom plate 100 provided in the embodiment of the present application combines the buffer energy absorption part 30 with the support layer 10 with the support hole 13, which significantly improves the protection performance of the power battery bottom plate 100. Compared with the traditional power battery bottom plate using steel plate, under the energy absorption requirements required by the same protection level, the power battery bottom plate 100 provided in the embodiment of the present application has lighter weight and better protection performance.

[0035] In the description of the present application, it should be understood that terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", and "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only used to simplify the description of the present application and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0036] This specification does not limit the specific structure of the support layer 10. For example, the support layer 10 may include at least one of the following structures: aluminum honeycomb panels, polypropylene honeycomb panels, and polypropylene perforated panels. Among them, the aluminum honeycomb panels have the advantages of light weight, high strength, good corrosion resistance, long life, and high plasticity. The polypropylene honeycomb panel also has the advantages of light weight and high strength, and also has good sound insulation, heat preservation, and heat insulation performance. In this embodiment, the support layer 10 includes an aluminum honeycomb panel 16, and the support hole 13 is a hexagonal honeycomb hole of each honeycomb unit on the aluminum honeycomb panel 16. The radial direction of the honeycomb hole (support hole 13) can extend along the thickness direction of the aluminum honeycomb panel 16 to buffer and absorb the energy that impacts the aluminum honeycomb panel 16 in the thickness direction; the radial direction of the honeycomb hole (support hole 13) can also extend in a direction inclined relative to the thickness direction of the aluminum honeycomb panel 16 to buffer and absorb impacts in more directions.

[0037] The aluminum honeycomb panel 16 has a honeycomb structure, which makes the overall panel lighter than a solid metal panel, and has higher strength and rigidity. In order to achieve the lightweight goal of the power battery bottom plate 100 while ensuring the structural strength of the aluminum honeycomb panel 16, in this embodiment, the wall thickness of the honeycomb unit of the aluminum honeycomb panel 16 is greater than or equal to 0.1 mm and less than or equal to 0.3 mm. For example, the wall thickness of the honeycomb unit of the aluminum honeycomb panel 16 can be 0.1 mm, 0.2 mm, 0.3 mm, etc.

[0038] In order to further improve the support strength of the support layer 10, in this embodiment, the thickness of the support layer 10 is set to be greater than or equal to 5 mm and less than or equal to 12 mm. For example, the thickness of the support layer 10 can be 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, etc. This specification does not limit the specific thickness of the support layer 10. In actual applications, the thickness of the support layer 10 can be adjusted according to the actual power battery product.

[0039] In practical applications, in order to achieve the required thickness of the support layer 10, an aluminum honeycomb panel 16 with the same thickness can be directly processed, or multiple aluminum honeycomb panels 16 can be stacked to achieve the required thickness. In this embodiment, the support layer 10 includes an aluminum honeycomb panel 16, the first surface 12 and the second surface 14 of the support layer 10 are the opposite sides of the aluminum honeycomb panel 16, and the support holes 13 penetrate the first surface 12 and the second surface 14 along the thickness direction of the aluminum honeycomb panel 16.

[0040] In some embodiments, please also refer to Figure 4 and Figure 5 , the support layer 10 may include a plurality of aluminum honeycomb panels 16, and the plurality of aluminum honeycomb panels 16 are stacked along the radial direction of the support hole 13, that is, the plurality of aluminum honeycomb panels 16 are stacked in sequence along their own thickness direction. This specification does not limit the thickness of each of the plurality of aluminum honeycomb panels 16, and the thickness of the plurality of aluminum honeycomb panels 16 may be the same or different. The first surface 12 and the second surface 14 of the support layer 10 are the side surfaces of the top and bottom aluminum honeycomb panels 16 facing away from other aluminum honeycomb panels 16 after the plurality of aluminum honeycomb panels 16 are stacked. The honeycomb holes of the plurality of aluminum honeycomb panels 16 may be aligned to form the support holes 13 of the support layer 10, and the support holes 13 pass through the first surface 12 and the second surface 14 along the thickness direction of the aluminum honeycomb panels 16. The honeycomb holes of the plurality of aluminum honeycomb panels 16 may also not be aligned to form staggered support holes 13 in the thickness direction.

[0041] In the present application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] Please also see Figure 4 and Figure 6The support layer 10 may further include a support aluminum plate 18. The present specification does not limit the specific position of the support aluminum plate 18. For example, when the number of the aluminum honeycomb panel 16 is one, the number of the support aluminum plate 18 may also be one, and it may be arranged on one side surface of the aluminum honeycomb panel 16. At this time, the side of the support aluminum plate 18 facing away from the aluminum honeycomb panel 16 forms the second surface 14, and the side of the aluminum honeycomb panel 16 facing away from the support aluminum plate 18 forms the first surface 12, and the support hole 13 passes through the first surface 12. When the support layer 10 includes a plurality of aluminum honeycomb panels 16, if the number of the support aluminum plate 18 is set to one, the support aluminum plate 18 may also be arranged on one side surface of the top or bottom aluminum honeycomb panel 16 facing away from other aluminum honeycomb panels 16; if the number of the support aluminum plates 18 is set to multiple, the multiple support aluminum plates 18 may be arranged between two adjacent aluminum honeycomb panels 16 among the multiple aluminum honeycomb panels 16. At this time, the first surface 12 and the second surface 14 of the support layer 10 are the side surfaces of the top and bottom aluminum honeycomb panels 16 facing away from other aluminum honeycomb panels 16 after the multiple aluminum honeycomb panels 16 are stacked. The support holes 13 form multiple channels under the separation of the multiple support aluminum plates 18, and the two ends of the support holes 13 respectively penetrate the first surface 12 and the second surface 14. The support aluminum plates 18 and the aluminum honeycomb panels 16 can be connected together by riveting or welding, and the connection is firm, which greatly improves the structural strength of the support layer 10 and makes it have higher compressive resistance.

[0043] Please also see Figure 4 and Figure 7 In this embodiment, the buffering energy absorbing part 30 is filled in the supporting hole 13 of the supporting layer 10. The present specification does not limit the specific structure of the buffering energy absorbing part 30. The buffering energy absorbing part 30 may include at least one of the following structures: a polystyrene foam filler, a polyurethane foam filler, a polyethylene foam filler, and a hard polyurethane foam filler. The buffering energy absorbing part 30 is made of energy absorbing foam material, which has the characteristics of light weight, good buffering performance, good plasticity and recyclability. The buffering energy absorbing part 30 is filled in the supporting hole 13 to form an energy absorbing supporting layer 32 together with the supporting layer 10.

[0044] During processing, the liquid material of the buffering energy absorbing part 30 is injected into the supporting hole 13 of the aluminum honeycomb panel 16. The liquid material of the buffering energy absorbing part 30 will foam under a specific temperature and environment. After foaming, the material is fully filled in the supporting hole 13 to form a block-filled energy absorbing part 30, so that the aluminum honeycomb panel 16 and the buffering energy absorbing part 30 form a whole, that is, an energy absorbing support layer 32 with high strength, rigidity and good energy absorption capacity is formed. In order to facilitate the control of the thickness of the energy absorbing support layer 32, during the processing, the material exceeding the first surface 12 and the second surface 14 of the buffering energy absorbing part 30 after foaming is completed will be cut and removed. The buffering energy absorbing part 30 is a foaming energy absorbing material. In actual applications, when the buffering energy absorbing part 30 is compressed and deformed, the energy absorption effect of the power battery bottom plate 100 is greatly improved without increasing the space occupied in the thickness direction.

[0045] The encapsulation layer 50 is arranged on one side of the support layer 10, and is used to improve the structural strength of the power battery bottom plate 100. This specification does not limit the number of encapsulation layers 50, and the number of encapsulation layers 50 can be one or two. If the support hole 13 only passes through the first surface 12 of the support layer 10, the number of encapsulation layers 50 can be set to one, and one encapsulation layer 50 is arranged on the first surface 12 to close the support hole 13. In this embodiment, the support hole 13 passes through the first surface 12 and the second surface 14, and the number of encapsulation layers 50 is set to two, and the two encapsulation layers 50 are respectively arranged on the first surface 12 and the second surface 14 to close the support hole 13.

[0046] This specification does not limit the specific structure of the encapsulation layer 50. For example, the encapsulation layer 50 can be a polypropylene board or a glass fiber board. In the present embodiment, the encapsulation layer 50 is a glass fiber board 52. The glass fiber board 52 has the characteristics of high strength, high elastic coefficient and light weight, and has good insulation performance. The glass fiber board 52 can maintain its good performance in a high temperature and humid environment, and can also be cut, drilled, bent and other processing as needed to meet the needs of various complex shapes and sizes. In the present embodiment, the glass fiber board 52 is connected to the support layer 10 by a hot pressing process. The two layers of glass fiber board 52 further improve the support strength and structural stability of the power battery bottom plate 100. In the present embodiment, the thickness of the glass fiber board 52 is greater than or equal to 1 mm and less than or equal to 3 mm. For example, the thickness of the glass fiber board 52 can be 1 mm, 2 mm, 3 mm, etc.

[0047] In this application, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" 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; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be internal communication between two elements, or it can be only surface contact. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] The energy-absorbing support layer 32 is sandwiched between two layers of glass fiber boards 52. When a heavy object impacts the glass fiber board 52 on one side, the energy-absorbing support layer 32 having a plurality of support holes 13 and a buffering energy-absorbing portion 30 filled in each support hole 13 plays a role of buffering and energy absorption, reducing a part of the impact force, thereby protecting the glass fiber board 52 on the other side from being broken by the heavy object and protecting the power battery from being damaged.

[0049] In the power battery bottom plate 100 provided in the embodiment of the present application, the setting of the support hole 13 enables the support layer 10 to have good support capacity and can be responsible for the transmission of rigid energy. The buffering energy-absorbing part 30 is accommodated in the support hole 13, which greatly improves the energy absorption effect of the power battery bottom plate 100. The encapsulation layer 50 is arranged on the surface of the support layer 10, which further improves the structural strength of the power battery bottom plate 100. The energy-absorbing support layer 32 is sandwiched between two layers of fiberglass boards 52. When a heavy object impacts the fiberglass board 52 on one side, the energy-absorbing support layer 32 with multiple support holes 13 and the buffering energy-absorbing part 30 filled in each support hole 13 plays a role in buffering and energy absorption, reducing part of the impact force, thereby protecting the fiberglass board 52 on the other side from being broken by the heavy object and protecting the power battery from damage.

[0050] The power battery bottom plate 100 provided in the embodiment of the present application combines the buffer energy absorption part 30 and the support layer 10 with the support hole 13, which significantly improves the protection performance of the power battery bottom plate 100. Compared with the traditional power battery bottom plate using steel plates, under the energy absorption requirements required by the same protection level, the power battery bottom plate 100 provided in the embodiment of the present application has a lighter weight and better protection performance.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A power battery bottom plate, characterized in that: include: A support layer, wherein the support layer has a first surface and a second surface opposite to each other, and the support layer is further provided with a plurality of support holes, wherein the support holes penetrate through the first surface; A buffering and energy absorbing part is accommodated in the plurality of supporting holes; as well as The encapsulation layer is disposed on the surface of the support layer to close the support hole.

2. The power battery bottom plate according to claim 1, characterized in that: The support layer includes at least one of the following structures: an aluminum honeycomb panel, a polypropylene honeycomb panel, and a polypropylene perforated panel.

3. The power battery bottom plate according to claim 1, characterized in that: The thickness of the support layer is greater than or equal to 5 mm and less than or equal to 12 mm.

4. The power battery bottom plate according to claim 1, characterized in that: The support layer includes an aluminum honeycomb panel, and the wall thickness of the honeycomb unit of the aluminum honeycomb panel is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

5. The power battery bottom plate according to claim 1, characterized in that: The support layer includes a plurality of aluminum honeycomb panels, and the plurality of aluminum honeycomb panels are stacked along the radial direction of the support hole.

6. The power battery bottom plate according to claim 5, characterized in that: The supporting layer also includes a supporting aluminum plate, and the supporting aluminum plate is arranged between two adjacent aluminum honeycomb panels.

7. The power battery bottom plate according to claim 1, characterized in that: The buffering energy absorbing part includes at least one of the following structures: a polystyrene foam filler, a polyurethane foam filler, a polyethylene foam filler, and a hard polyurethane foam filler.

8. The power battery bottom plate according to claim 7, characterized in that: The buffer energy absorbing portion is filled in the support hole to form an energy absorbing support layer together with the support layer.

9. The power battery bottom plate according to any one of claims 1 to 8, characterized in that: The supporting hole also passes through the second surface. Two packaging layers are provided. The two packaging layers are respectively provided on the first surface and the second surface to close the supporting hole.

10. The power battery bottom plate according to any one of claims 1 to 8, characterized in that: The packaging layer is a glass fiber board, and the glass fiber board is connected to the supporting layer through a hot pressing process.

11. The power battery bottom plate according to claim 10, characterized in that: The thickness of the glass fiber board is greater than or equal to 1 mm and less than or equal to 3 mm.

12. A power battery pack, characterized in that: include: Box; The power battery bottom plate according to any one of claims 1 to 11, arranged in the box; as well as The battery module is arranged in the box and located on the power battery bottom plate.

13. A means of transport, characterized in that: include: Car body, and The power battery pack as claimed in claim 12, wherein the power battery pack is disposed in the vehicle body.

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