Battery pack bottom protection plate and vehicle

Abstract

The utility model relates to the technical field of vehicle parts, and provides a battery pack bottom protection plate and a vehicle, the battery pack bottom protection plate comprises a metal layer, a first composite material layer and a second composite material layer, the metal layer comprises a protection part and a mounting part, the first composite material layer and the second composite material layer are laid on the upper surface and the lower surface of the metal layer respectively and cover the protection part and the installation part, the installation part is arranged along the edge of the protection part and used for being connected with the battery pack, and the strength of a metal material of the protection part is larger than that of a metal material of the installation part. Therefore, the battery pack bottom protection plate is roughly of a layer-by-layer stacked structure of composite material, metal and composite material, and the weight of the battery pack bottom protection plate can be reduced while the safety protection performance of the battery pack bottom protection plate is ensured; moreover, the upper surface and the lower surface of the metal layer are coated with the composite material layer, the risk that the metal layer is rusted can be reduced, electrophoresis and PVC spraying can be omitted, and the purposes of reducing weight and reducing cost are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle parts, and in particular to a battery pack bottom guard plate and a vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the safety of battery packs has received more and more attention from consumers. Among them, the battery pack bottom guard plate plays a vital role in the safety of the battery pack because it can protect the battery pack when the car is scraped or bottomed out to prevent the battery pack from extrusion and deformation, explosion and fire, etc.

[0003] At present, there are two main types of existing battery pack bottom guard plates. One is to use high-strength steel plates as bottom guard plates. Although high-strength steel plates have high strength, they are heavy, which can easily increase the weight and power consumption of the vehicle and reduce the cruising range. The other is to use extruded aluminum alloy or stamped aluminum alloy as the bottom guard plate. The strength of aluminum alloy is relatively low, so thicker materials are usually required to meet the strength requirements and improve the safety protection performance of the bottom guard plate. However, this will increase the weight of the bottom guard plate. In addition, the cost of aluminum alloy is high, which increases the production cost. Utility Model Content

[0004] The problem solved by the utility model is: how to reduce the weight of the bottom guard plate while ensuring the safety protection performance of the bottom guard plate of the battery pack.

[0005] In order to solve the above problems, the utility model provides a battery pack bottom guard plate, including a metal layer, a first composite material layer and a second composite material layer, the metal layer includes a protective part and an installation part, the first composite material layer and the second composite material layer are respectively laid on the upper surface and the lower surface of the metal layer, and cover the protective part and the installation part, the installation part is arranged along the edge of the protective part, and is used to be connected to the battery pack, and the strength of the metal material of the protective part is greater than the strength of the metal material of the installation part.

[0006] Optionally, the metal material of the protection part is high-strength steel, and the metal material of the mounting part is aluminum alloy.

[0007] Optionally, the mounting portion is provided with a mounting hole, and the battery pack bottom guard plate is used to be connected to the battery pack at the mounting hole via fasteners.

[0008] Optionally, the protective portion is provided with a first connection structure, the mounting portion is provided with a second connection structure, and the first connection structure is plug-fitted with the second connection structure.

[0009] Optionally, the first connection structure and the second connection structure are respectively one of a groove and a protrusion.

[0010] Optionally, the thickness of the protective portion is between 0.7 mm and 1.2 mm.

[0011] Optionally, the composite material of the first composite material layer and / or the second composite material layer is a continuous fiber reinforced thermoplastic composite material.

[0012] Optionally, the first composite material layer and / or the second composite material layer comprises a plurality of layers of continuous fiber reinforced thermoplastic prepreg tapes.

[0013] Optionally, the metal layer and the first composite material layer, and / or the metal layer and the second composite material layer are bonded by an adhesive film.

[0014] In order to solve the above problems, the utility model also provides a vehicle, including the battery pack bottom guard plate as described above.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The battery pack bottom guard plate of the utility model can be formed by laying the first composite material layer and the second composite material layer on the upper surface and the lower surface of the metal layer respectively, so that the battery pack bottom guard plate is roughly a layered structure of composite material + metal + composite material. Compared with the prior art using pure steel plate or pure aluminum plate as the battery pack bottom guard plate, the composite material layer has the characteristics of high strength and light weight, so that the battery pack bottom guard plate of the utility model can reduce the weight while ensuring the strength meets the use requirements, thereby ensuring the safety protection performance of the battery pack bottom guard plate while reducing the weight of the battery pack bottom guard plate. Moreover, by covering the protective part and the installation part of the metal layer with the composite material layer, the upper surface and the lower surface of the metal layer are coated with the composite material layer with good anti-corrosion ability, thereby reducing the risk of rusting of the protective part and the installation part of the metal layer, and at the same time, the electrophoresis and spraying PVC treatment processes can be omitted, thereby achieving the purpose of reducing weight and cost. Moreover, compared with the bottom guard plate structure of pure composite materials, since the metal has good flame retardancy, even if a fire occurs, the metal layer can also play a good blocking role, thereby protecting the battery pack. In addition, by setting the strength of the metal material of the protective part located in the middle area of ​​the metal layer to be greater than the strength of the metal material of the mounting part located in the peripheral area of ​​the metal layer, it is ensured that the middle area on the bottom guard plate of the battery pack for mounting the battery pack has a higher strength, thereby being able to better protect the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional view of the bottom guard plate of the battery pack in an embodiment of the present utility model;

[0018] Figure 2This is a schematic diagram of the exploded structure of the bottom guard plate of the battery pack in the embodiment of the utility model;

[0019] Figure 3 This is a schematic structural diagram of the metal layer of the bottom guard plate of the battery pack in an embodiment of the present utility model;

[0020] Figure 4 It is a structural schematic diagram of the protective portion and the mounting portion of the metal layer in the embodiment of the utility model when they are matched through the first connecting structure and the second connecting structure.

[0021] Description of reference numerals:

[0022] 1. Metal layer; 11. Protective part; 111. First connection structure; 12. Mounting part; 121. Second connection structure; 2. First composite material layer; 3. Second composite material layer; 4. Mounting hole; 5. Adhesive film. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] The Z-axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis (i.e., the direction indicated by the arrow) represents the top, and the reverse direction of the Z-axis represents the bottom. It should be noted that the aforementioned Z-axis representation is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0026] Combination Figures 1 to 3 As shown, an embodiment of the utility model provides a battery pack bottom guard plate, including a metal layer 1, a first composite material layer 2 and a second composite material layer 3, the metal layer 1 includes a protective portion 11 and an installation portion 12, the first composite material layer 2 and the second composite material layer 3 are respectively laid on the upper surface and the lower surface of the metal layer 1, and cover the protective portion 11 and the installation portion 12, the installation portion 12 is arranged along the edge of the protective portion 11, and is used to connect with the battery pack, and the strength of the metal material of the protective portion 11 is greater than the strength of the metal material of the installation portion 12.

[0027] Specifically, the metal layer 1 is generally a thin plate structure, the first composite material layer 2 and the second composite material layer 3 are generally also thin plate structures, the first composite material layer 2 and the second composite material layer 3 are laid on the upper surface and the lower surface of the metal layer 1, respectively, and the metal layer 1 and the first composite material layer 2 and the metal layer 1 and the second composite material layer 3 are generally fixedly connected by bonding. In other words, the metal layer 1 is sandwiched between the two composite material layers, so that the battery pack bottom guard plate is roughly a sandwich structure of composite material + metal + composite material, or a layered structure. At this time, the metal layer 1 located in the middle layer does not need to be treated with electrophoresis and spraying PVC (Polyvinyl chloride, polyvinyl chloride, English abbreviation PVC). The protective portion 11 and the mounting portion 12 of the metal layer 1 are different areas of the metal sheet, and the metal materials in different areas of the metal layer 1 are different. For example, since the main body of the battery pack is usually installed in the middle area of ​​the bottom guard plate, and the frame of the battery pack is usually connected to the peripheral area of ​​the bottom guard plate of the battery pack, it is necessary to ensure that the middle area of ​​the bottom guard plate of the battery pack has a higher strength to better protect the battery pack. Therefore, under the same thickness, the strength of the metal material in the middle area of ​​the metal layer 1 needs to be greater than the strength of the metal material in the peripheral area. That is to say, the protective portion 11 located in the middle area of ​​the metal layer 1 is a metal material with higher strength such as high-strength steel, and the mounting portion 12 located in the peripheral area of ​​the metal layer 1 is a metal material with lower strength such as aluminum alloy. The protective portion 11 and the mounting portion 12 are usually connected by means such as plugging, and the mounting portion 12 and the frame of the battery pack are usually fixedly connected by means such as bolting. The mounting portion 12 can be a closed ring structure (such as a full circle) arranged along the edge of the protective portion 11. Figure 1 As shown), it can also be a semi-enclosed structure arranged along a portion of the edge of the protective portion 11, that is, the mounting portion 12 is a non-closed ring structure with a gap, but in actual applications it is usually preferred that the mounting portion 12 is a closed ring structure.

[0028] In this embodiment, the first composite material layer 2 and the second composite material layer 3 can be laid on the upper surface and the lower surface of the metal layer 1 respectively, so that the battery pack bottom guard plate is roughly a layered structure of composite material + metal + composite material. Compared with the use of pure steel plate or pure aluminum plate as the battery pack bottom guard plate in the prior art, the composite material layer has the characteristics of high strength and light weight, so that the battery pack bottom guard plate of this embodiment can reduce the weight while ensuring the strength meets the use requirements, thereby ensuring the safety protection performance of the battery pack bottom guard plate while reducing the weight of the battery pack bottom guard plate. Moreover, by covering the protective part 11 and the installation part 12 of the metal layer 1 with the composite material layer, the upper surface and the lower surface of the metal layer 1 are coated with the composite material layer with good anti-corrosion ability, thereby reducing the risk of rusting of the protective part 11 and the installation part 12 of the metal layer 1. At the same time, the electrophoresis and spraying PVC treatment processes can be omitted, thereby achieving the purpose of reducing weight and reducing costs. Moreover, compared with the bottom guard plate structure of pure composite materials, since metal has good flame retardancy, even if a fire occurs, the metal layer 1 can also play a good blocking role, thereby protecting the battery pack. In addition, by setting the strength of the metal material of the protection part 11 located in the middle area of ​​the metal layer 1 to be greater than the strength of the metal material of the mounting part 12 located in the peripheral area of ​​the metal layer 1, it is ensured that the middle area of ​​the bottom guard plate of the battery pack for mounting the battery pack has a higher strength, thereby better protecting the battery pack.

[0029] Optionally, the metal material of the protection part 11 is high-strength steel, and the metal material of the mounting part 12 is aluminum alloy.

[0030] In this embodiment, the material of the protection part 11 is high-strength steel, that is, the protection part 11 is a high-strength steel plate, and the tensile strength of the high-strength steel is generally between 500MPa and 1500MPa. In practical applications, the high-strength steel is generally preferably HC550 / 980DP. The material of the mounting part 12 is aluminum alloy, that is, the mounting part 12 is an aluminum alloy plate, and 5 series or 6 series aluminum alloy is generally preferred. For example, in one example, the mounting part 12 is a 6063 aluminum alloy plate. In other words, the metal layer 1 is composed of thin plates of two metal materials, that is, the middle area of ​​the metal layer 1 is a high-strength steel plate, the peripheral area of ​​the metal layer 1 is an aluminum alloy plate, and the periphery of the high-strength steel plate is covered by an aluminum alloy plate. Since aluminum alloy has good corrosion resistance and light weight, the periphery of the protective part 11 made of high-strength steel is covered with an aluminum alloy mounting part 12. This can not only ensure the strength of the middle area of ​​the metal layer 1 while reducing the weight of the peripheral area of ​​the metal layer 1, but also reduce the risk of rust in the peripheral area of ​​the metal layer 1, thereby ensuring the stability of the connection between the peripheral area of ​​the metal layer 1 and the frame of the battery pack.

[0031] Optionally, the thickness of the protective portion 11 is between 0.7 mm and 1.2 mm. If the thickness of the high-strength steel plate is designed to be too small, it is easy to reduce the strength of the bottom guard plate of the battery pack, and then it is easy to cause a large deformation when a bottom collision occurs, which has an adverse effect on the battery pack; if the thickness of the high-strength steel plate is designed to be too large, it is easy to increase the weight of the bottom guard plate of the battery pack, which is not convenient for lightweight design. Therefore, in this embodiment, the thickness of the protective portion 11 is set between 0.7 mm and 1.2 mm, so that the protective portion 11 of the bottom guard plate of the battery pack has both high strength and light weight.

[0032] Furthermore, combined with Figure 1 As shown, the thickness of the protection portion 11 and the mounting portion 12 are the same. This arrangement ensures that the battery pack bottom guard plate has a certain flatness, which is convenient for layout and installation.

[0033] Optionally, combined Figure 2 and Figure 3 As shown, the mounting portion 12 is provided with a mounting hole 4, and the battery pack bottom guard plate is used to be connected to the battery pack at the mounting hole 4 through fasteners.

[0034] In this embodiment, mounting holes 4 are usually provided on the first composite material layer 2 and the second composite material layer 3. Thus, during assembly, fasteners such as bolts can be used to sequentially pass through the mounting holes 4 on the first composite material layer 2, the metal layer 1 and the second composite material layer 3 to connect to the bolt holes on the frame of the battery pack, and then fasten with nuts to achieve assembly between the battery pack bottom guard plate and the battery pack.

[0035] Optionally, combined Figure 3 and Figure 4 As shown, the protection portion 11 is provided with a first connection structure 111 , the mounting portion 12 is provided with a second connection structure 121 , and the first connection structure 111 is plug-fitted with the second connection structure 121 .

[0036] In this embodiment, the first connection structure 111 is usually arranged at the edge of the protective part 11, the mounting part 12 is usually a closed ring structure, and the second connection structure 121 is usually arranged at the inner side (i.e., the side of the mounting part 12 facing the protective part 11) edge of the mounting part 12. During assembly, the first connection structure 111 and the second connection structure 121 are usually plugged together in the up and down direction to form the metal layer 1. After being plugged in place, there is usually a gap of, for example, 1 mm between the first connection structure 111 and the second connection structure 121 to ensure smooth assembly of the protective part 11 and the mounting part 12 when there is a manufacturing error or an assembly error. In addition, bonding can be performed at the gap between the first connection structure 111 and the second connection structure 121 to improve the firmness of the connection between the protective part 11 and the mounting part 12. In this way, the assembly of the protective part 11 and the mounting part 12 can be pre-positioned by utilizing the plug-in cooperation of the first connecting structure 111 and the second connecting structure 121, so as to facilitate the subsequent bonding of the two at the gap between the protective part 11 and the mounting part 12, so that the metal layer 1 as a whole presents a flat metal plate, thereby facilitating the bonding of the first composite material layer 2 and the second composite material layer 3 to the upper and lower surfaces of the metal layer 1, respectively, and also can increase the contact area between the protective part 11 and the mounting part 12, thereby increasing the bonding area between the protective part 11 and the mounting part 12 and improving the firmness of the connection.

[0037] Optionally, combined Figure 4 As shown, the first connection structure 111 and the second connection structure 121 are respectively one of a groove and a protrusion.

[0038] In this embodiment, a plurality of grooves may be arranged at intervals on the edge of the protection portion 11, and a plurality of protrusions may be arranged at intervals on the inner edge of the mounting portion 12; a plurality of protrusions may be arranged at intervals on the edge of the protection portion 11, and a plurality of grooves may be arranged at intervals on the inner edge of the mounting portion 12; a plurality of grooves and a plurality of protrusions may be arranged alternately on the edge of the protection portion 11, and a plurality of grooves and a plurality of protrusions may be arranged alternately on the inner edge of the mounting portion 12. The shape of the groove or protrusion may be rectangular, sawtooth, semicircular, or sinusoidal, etc., which is not specifically limited here. In this way, by forming the junction of the protection portion 11 and the mounting portion 12 into a connection structure in which protrusions and grooves are alternately matched, the sudden change in strength and stiffness at the transition area of ​​the metal layer 1 is reduced.

[0039] Optionally, the composite material of the first composite material layer 2 and / or the second composite material layer 3 is a continuous fiber reinforced thermoplastic composite material.

[0040] In this embodiment, the fiber of the continuous fiber reinforced thermoplastic composite material is generally one of carbon fiber, glass fiber and basalt fiber. In practical applications, the glass fiber that is currently more widely used is generally preferred. The resin matrix of the continuous fiber reinforced thermoplastic composite material is generally one of polypropylene (PP for short in English), polyethylene (PE for short in English) and polyamide (PA for short in English). In practical applications, PP is generally preferred. Compared with non-continuous fibers, continuous fibers have higher strength, which can improve the strength of the composite material layer, thereby improving the safety performance of the battery pack bottom guard plate. Moreover, since the continuous fiber reinforced thermoplastic composite material has the advantages of high strength, low density and impact resistance, the continuous fiber reinforced thermoplastic composite material is used as the composite material layer, which can reduce the thickness of the high-strength steel plate in the middle area of ​​the metal layer 1, thereby achieving a lightweight design while ensuring the strength performance of the battery pack bottom guard plate.

[0041] Optionally, the first composite material layer 2 and / or the second composite material layer 3 comprises a plurality of layers of continuous fiber reinforced thermoplastic prepreg tapes.

[0042] In this embodiment, the upper and lower composite material layers of the metal layer 1 are generally formed by laying multiple layers of continuous fiber reinforced resin unidirectional prepreg tapes, wherein the continuous fiber reinforced resin unidirectional prepreg tapes can be laid in layers, and the number of layers is generally 2 to 8 layers, or can be laid side by side, which is not specifically limited here. Preferably, the thickness of the unidirectional prepreg tape is 0.15 to 0.3 mm, and the total thickness of the composite material layer is 0.3 mm to 2.4 mm. Since multiple layers of continuous fiber reinforced thermoplastic prepreg tapes have high wear resistance, the composite material layer is made by laying multiple layers of continuous fiber reinforced thermoplastic prepreg tapes to further improve the strength of the composite material layer, thereby further improving the anti-scratch and bottom supporting capabilities of the battery pack bottom guard plate, and then improving the collision safety performance of the battery pack bottom guard plate.

[0043] Optionally, combined Figure 2 As shown, the metal layer 1 and the first composite material layer 2, and / or the metal layer 1 and the second composite material layer 3 are bonded by means of an adhesive film 5. In this way, the reliability of the connection between the composite material layer and the metal layer 1 can be ensured.

[0044] Furthermore, the material of the adhesive film 5 is similar to the resin matrix of the composite material layer, and is usually preferably PP, PE or PA. In this way, the connection strength between the composite material layer and the metal layer 1 can be improved by utilizing the better compatibility of the same materials.

[0045] Another embodiment of the present invention provides a vehicle, comprising the battery pack bottom guard plate as described above.

[0046] The beneficial effects of the vehicle in this embodiment relative to the prior art are the same as those of the above-mentioned vehicle and will not be described in detail here.

[0047] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A battery pack bottom guard plate, characterized in that: The invention comprises a metal layer (1), a first composite material layer (2) and a second composite material layer (3); the metal layer (1) comprises a protective part (11) and a mounting part (12); the first composite material layer (2) and the second composite material layer (3) are respectively laid on the upper surface and the lower surface of the metal layer (1) and cover the protective part (11) and the mounting part (12); the mounting part (12) is arranged along the edge of the protective part (11) and is used for connecting to a battery pack; and the strength of the metal material of the protective part (11) is greater than the strength of the metal material of the mounting part (12).

2. The battery pack bottom guard plate according to claim 1, characterized in that: The metal material of the protection part (11) is high-strength steel, and the metal material of the mounting part (12) is aluminum alloy.

3. The battery pack bottom guard plate according to claim 1, characterized in that: The mounting portion (12) is provided with a mounting hole (4), and the battery pack bottom guard plate is used to be connected to the battery pack at the mounting hole (4) via a fastener.

4. The battery pack bottom guard plate according to claim 1, characterized in that: The protection portion (11) is provided with a first connection structure (111), the installation portion (12) is provided with a second connection structure (121), and the first connection structure (111) and the second connection structure (121) are plug-fitted.

5. The battery pack bottom guard plate according to claim 4, characterized in that: The first connection structure (111) and the second connection structure (121) are respectively one of a groove and a protrusion.

6. The battery pack bottom guard plate according to claim 2, characterized in that: The thickness of the protective portion (11) is between 0.7 mm and 1.2 mm.

7. The battery pack bottom guard plate according to claim 1, characterized in that: The composite material of the first composite material layer (2) and / or the second composite material layer (3) is a continuous fiber reinforced thermoplastic composite material.

8. The battery pack bottom guard plate according to claim 1, characterized in that: The first composite material layer (2) and / or the second composite material layer (3) comprise multiple layers of continuous fiber reinforced thermoplastic prepreg tapes.

9. The battery pack bottom guard plate according to claim 1, characterized in that: The metal layer (1) and the first composite material layer (2), and / or the metal layer (1) and the second composite material layer (3) are bonded via an adhesive film (5).

10. A vehicle, characterized in that: Comprising a battery pack bottom protective plate as described in any one of claims 1-9.

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