Power battery protection plate, battery pack comprising same and vehicle

Abstract

The utility model relates to a power battery protection plate, and a battery pack and a vehicle comprising the same. The protection plate sequentially comprises a first surface layer, a buffer layer, a first adhesive film layer, a metal plate layer, a second adhesive film layer, a honeycomb core layer and a second surface layer from bottom to top. According to the utility model, the multi-structure combination is adopted, so that the bottom guard plate has a gradient energy absorption effect, the shock resistance of the bottom guard plate is improved, and different materials can be combined according to different application scenes to meet different requirements; the thickness of the product has designability, and customized preparation can be achieved according to the requirement of the installation size.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, and in particular to a power battery protection plate, and a battery pack and a vehicle comprising the same. Background Art

[0002] Against the backdrop of increasingly severe global natural resources and oil resources, new energy vehicles, led by electric vehicles, have begun to emerge. Compared with traditional fuel vehicles, they use electricity and do not produce carbon monoxide, carbon dioxide and other gases that are harmful to the environment, thus reducing environmental pollution. The protective plate is installed at the bottom of the vehicle body and is the bearing part of the power battery box of the new energy vehicle. It is used to protect the battery box from damage when it is hit or squeezed by the outside world. At present, the protective plate of the car is mainly made of metal alloy materials, but the weight is large, which greatly reduces the battery's mileage; moreover, the chassis is often in contact with rain, oil, etc., which will cause continuous corrosion of metal parts and bring safety hazards. Continuous fiber reinforced thermoplastic composites have been widely used in many fields such as automobile industry, aerospace, military industry, electronics, etc. due to their light weight, high stiffness, high toughness, and recyclability; however, in the face of the impact of stones and sharp objects, pure thermoplastic composites have poor ductility and cannot protect the battery well. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a power battery protection plate, and a battery pack and a vehicle comprising the same.

[0004] The technical solution adopted by the utility model to solve its technical problems is: to provide a power battery protection plate, the protection plate includes a buffer layer, a honeycomb core layer and a metal plate layer located between the buffer layer and the honeycomb core layer, wherein one or more first adhesive film layers are arranged between the honeycomb core layer and the metal plate layer; one or more second adhesive film layers are arranged between the buffer layer and the metal plate layer, wherein the thickness of the first adhesive film layer or the second adhesive film layer is less than the thickness of the metal layer.

[0005] The buffer layer is far away from the battery layer and closer to the ground, while the honeycomb core layer is close to the battery layer.

[0006] The protective plate comprises a surface layer; wherein the surface layer comprises a first surface layer and / or a second surface layer; wherein the first surface layer is the upper layer of the protective plate, and the second surface layer is the lower layer of the protective plate.

[0007] The first surface layer is arranged on the upper surface of the honeycomb core layer; the second surface layer is arranged on the lower surface of the buffer layer.

[0008] The first surface layer is close to the battery surface layer, and the second surface layer is far away from the battery surface layer and closer to the ground.

[0009] The surface layer is one or more layers of continuous fiber reinforced thermoplastic resin composite material.

[0010] The continuous fiber reinforced thermoplastic resin composite material layer is composited by continuous fiber and thermoplastic resin through a melt impregnation process, the content of continuous fiber is 35% to 75%, the thickness range is 0.15mm to 0.55mm, and the width is 25mm to 1470mm. The continuous fiber reinforced thermoplastic resin composite material layer solves the problems of heavy weight, corrosion resistance, poor designability, and difficult processing technology of a single metal material; it truly realizes the effective combination of different materials, overcomes certain weaknesses of a single material, and makes up for its "short board", and the product has good processing performance and strong designability.

[0011] The buffer layer comprises a sawtooth structure, cavities are randomly distributed in the buffer layer, and the cavities are filled with granular materials.

[0012] The buffer layer is designed with a serrated structure and cavities are randomly distributed in the buffer layer. The cavities are filled with granular materials, so that when the protective plate is impacted by the outside world, the stress can be deflected, thereby expanding the stress propagation path, achieving better energy absorption effect, and greatly improving the impact resistance of the protective plate.

[0013] The size of the particles is 1-70 microns; the particles are rubber particles.

[0014] The buffer layer containing a sawtooth structure means that a sawtooth structure is provided on the upper surface and / or the lower surface of the buffer layer.

[0015] The hardness of the buffer layer is 50-80A, and the thickness is 0.5-2mm. The buffer layer within this hardness range has good compressive resistance, and can reduce the change in the thickness of the buffer layer during hot pressing and laminating; within this thickness range, the overall thickness of the protective plate is ensured to be small and has high impact resistance.

[0016] The buffer layer material is at least one of TPV, TPU and TPE.

[0017] The first adhesive film layer and the second adhesive film layer are used to make the metal plate layer bond better with the honeycomb core layer and the buffer layer respectively.

[0018] The gram weight of the first adhesive film layer and / or the second adhesive film layer is 60-150gsm. If the gram weight is too low, the bonding effect between the metal plate layer and the honeycomb core and the buffer layer will be affected. If the gram weight is too high, the weight of the product will be increased and the bonding effect will not be further improved.

[0019] The thickness of the first adhesive film layer and the second adhesive film layer may be the same or different.

[0020] The first adhesive film and / or the second adhesive film is a PP adhesive film.

[0021] By using PP adhesive film, the buffer layer and the metal plate layer, and the honeycomb core layer and the metal plate layer all have good bonding properties.

[0022] The thickness of the metal plate is 0.28 mm to 4.0 mm.

[0023] Furthermore, the metal plate layer material is a steel plate, an aluminum alloy plate, a cold-rolled plate, or a galvanized plate. For example, the aluminum alloy plate refers to an aluminum alloy plate containing a metal Mg-Si system.

[0024] The bulk density of the honeycomb core layer is 40 kg / m 3 ~150kg / m 3 , thickness is 5mm-25mm.

[0025] The utility model provides a battery pack, comprising a tray and a protective plate as described in any one of the items, wherein the protective plate is mounted on the tray.

[0026] A vehicle of the utility model comprises a battery pack and any one of the power battery protection plates arranged below the battery pack.

[0027] Beneficial Effects

[0028] Due to the adoption of the above-mentioned technical scheme, compared with the prior art, the utility model has the following advantages and positive effects: the utility model adopts a combination of multiple structures to enable the bottom guard plate to have a gradient energy absorption effect (when the bottom of the bottom guard plate is impacted, the second surface layer absorbs part of the impact energy through fiber breakage and cracking of the thermoplastic resin, and then the buffer layer absorbs part of the impact energy through deformation and tearing, and then absorbs energy through the interface stratification between the film and the metal plate, and then absorbs energy through the breakage of the steel plate, and then absorbs energy through the extrusion deformation of the honeycomb core, and finally absorbs energy through the breakage of the first surface layer fibers and the cracking of the thermoplastic resin), thereby improving the impact resistance of the bottom guard plate, and different materials can be combined according to different application scenarios to meet different needs; the thickness of the product is designable, and customized preparation can be achieved according to the requirements of the installation size. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 1 is a schematic diagram of the structure of the utility model; wherein 1 is a first surface layer, 2 is a honeycomb core layer, 3 is a metal plate layer, 4 is a buffer layer, 5 is a second surface layer, 6 is a first adhesive film layer, and 7 is a second adhesive film layer;

[0030] Figure 2 Schematic diagram of the buffer layer structure; 4-1 is a cavity, and 4-2 is a particle. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0032] The embodiment of the utility model relates to a power battery protection plate which comprises in sequence: a first surface layer 1, a honeycomb core layer 2, a first adhesive film layer 6, a metal plate layer 3, a second adhesive film layer 7, a buffer layer 4, and a second surface layer 5.

[0033] The first surface layer 1 is close to the battery surface layer, and the second surface layer is far away from the battery surface layer and closer to the ground.

[0034] The buffer layer contains a serrated structure, which improves the impact resistance of the material and reduces the deformation. The buffer layer is randomly distributed with cavities filled with granular materials, and the energy absorption capacity of the material is improved by physical toughening. Optionally, if the buffer layer contains a serrated structure, the upper surface of the buffer layer can be provided with a serrated structure, the lower surface can be provided with a serrated structure, or both the upper and lower surfaces can be provided with a serrated structure. The first adhesive film layer and the second adhesive film layer are used to make the steel plate better bonded to the honeycomb core layer and the buffer layer respectively. The honeycomb core layer improves the overall stiffness and anti-buffering performance of the material, and the compressibility of the honeycomb core layer and the buffer layer expands the adaptability of the parts.

[0035] In the protective plate of the specific embodiments of the utility model, in some specific embodiments, the materials of the first surface layer 1 and the second surface layer 5 are both continuous fiber reinforced thermoplastic resin composite materials, and the continuous fiber reinforced thermoplastic resin composite surface layer and the metal plate layer are combined to avoid some performance shortcomings brought about by a single material.

[0036] In some specific embodiments of the protective plate of the utility model, cavities are randomly distributed in the buffer layer 4, and the cavities are filled with granular materials, the size of the particles can be 1-70 microns; the particles are rubber particles.

[0037] The hardness of the buffer layer 4 may be 50-80A, and the thickness may be 0.5-2 mm. For example, the thickness of the buffer layer 4 may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm or 2 mm.

[0038] In the protective plate of the specific embodiments of the utility model, in some specific embodiments, the weight of the first film layer 6 and the second film layer 7 is 60-150gsm. For example, the weight of the film layer is 60gsm, 70gsm, 80gsm, 90gsm, 100gsm, 110gsm, 120gsm, 130gsm, 140gsm or 150gsm, etc., to ensure the bonding and lightweight effects.

[0039] In some embodiments of the protective plate of the utility model, the first adhesive film layer 6 is one or more layers. Specifically, the first adhesive film layer can be 1 layer, 2 layers, 3 layers or 4 layers.

[0040] In the protective plate of the specific embodiment of the utility model, in some specific embodiments, the second adhesive film layer 7 is one or more layers. Specifically, the second adhesive film layer can be 1 layer, 2 layers, 3 layers or 4 layers.

[0041] The thickness of the first adhesive film layer and the second adhesive film layer may be the same or different.

[0042] In the protective plate of the specific embodiment of the utility model, in some specific embodiments, the first film layer 6 and the second film layer 7 can be selected as PP film, and the "steel-plastic combination" of materials is achieved through the first PP film layer and the second PP film layer, which realizes the lightweight of the product and meets the high performance requirements.

[0043] The protective plate of the specific embodiment of the utility model, in some specific embodiments, the material of the metal plate layer 3 is a steel plate or an aluminum alloy plate;

[0044] In the protective plate of the specific embodiment of the utility model, in some specific embodiments, the thickness of the metal plate layer 3 can be 0.28mm~4.0mm; for example, the thickness of the metal plate layer can be 0.28mm, 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm or 4mm, etc.

[0045] In the protective plate of the specific embodiment of the utility model, in some specific embodiments, the bulk density of the honeycomb core layer 2 is 40 kg / m 3 ~150kg / m 3 The thickness can be 5mm-25mm. For example, the thickness of the honeycomb core layer can be 5mm, 10mm, 15mm, 20mm or 25mm, etc.

[0046] Comparative Example 1

[0047] The power battery protection plate includes, from bottom to top, the first surface layer 1, the honeycomb core layer 2, the first adhesive film layer 6, the metal plate layer 3, the buffer layer 4, and the second surface layer 5. The first surface layer 1 is close to the battery surface layer, and the second surface layer is far away from the battery surface layer and closer to the ground.

[0048] Due to the absence of the second adhesive film layer, the buffer layer and the metal plate layer cannot bond together after being composited, resulting in delamination. There is a risk of falling during the driving of the vehicle.

[0049] Comparative Example 2

[0050] The power battery protection plate includes, from bottom to top, the first surface layer 1, the honeycomb core layer 2, the metal plate layer 3, the second adhesive film layer 7, the buffer layer 4, and the second surface layer 5. The first surface layer 1 is close to the battery surface layer, and the second surface layer is far away from the battery surface layer and closer to the ground.

[0051] Due to the absence of the first adhesive film layer, the honeycomb core and the metal plate layer cannot be bonded after being composited, resulting in delamination. The impact resistance of the bottom guard plate is poor, and the steel guard cannot be fixed, which also poses a risk of falling.

[0052] Comparative Example 3

[0053] The power battery protection plate includes: a first surface layer 1, a honeycomb core layer 2, a first adhesive film layer 6, a metal plate layer 3, a second adhesive film layer 7, a buffer layer 4, and a second surface layer 5. The first surface layer 1 is close to the battery surface layer, and the second surface layer is far away from the battery surface layer and closer to the ground.

[0054] Among them, only the thickness of the first adhesive film layer is greater than the metal plate layer, which not only increases the thickness of the bottom guard plate, but also makes it more likely that the internal part of the PP adhesive film layer will be damaged, resulting in poor bonding performance between the metal plate and the honeycomb core.

[0055] Among them, only the thickness of the second film layer is greater than that of the metal plate layer, which not only increases the thickness of the bottom guard plate, but also makes it more likely that the internal part of the PP film layer will be damaged, resulting in poor bonding performance between the metal plate and the buffer layer.

[0056] Comparative Example 4

[0057] The power battery protection plate is from bottom to top: the power battery protection plate includes: the first surface layer 1, the honeycomb core layer 2, the first adhesive film layer 6, the metal plate layer 3, the second adhesive film layer 7, the buffer layer 4, and the second surface layer 5. The first surface layer is far away from the battery surface layer and closer to the ground; the second surface layer 1 is close to the battery surface layer. As a result, the bottom guard plate cannot play a good role in protecting the battery, because there is no buffer layer to absorb a large amount of impact energy, causing the metal plate to break and produce a large deformation, and there is a risk of sharp metal objects piercing the battery.

Claims

1. A power battery protection plate, characterized in that: The protective plate includes a buffer layer, a honeycomb core layer and a metal plate layer located between the buffer layer and the honeycomb core layer, wherein one or more first adhesive film layers are provided between the honeycomb core layer and the metal plate layer; one or more second adhesive film layers are provided between the buffer layer and the metal plate layer, wherein the thickness of the first adhesive film layer or the second adhesive film layer is less than the thickness of the metal plate layer; wherein the buffer layer is far away from the battery layer and closer to the ground; and the honeycomb core layer is close to the battery layer.

2. The power battery protection plate according to claim 1, characterized in that: The protective plate includes a surface layer; the surface layer includes a first surface layer and / or a second surface layer; wherein the first surface layer is the upper layer of the protective plate, and the second surface layer is the lower layer of the protective plate.

3. The power battery protection plate according to claim 2, characterized in that: The surface layer is one or more layers of continuous fiber reinforced thermoplastic resin composite material.

4. The power battery protection plate according to claim 1, characterized in that: The buffer layer comprises a sawtooth structure, cavities are randomly distributed in the buffer layer, and the cavities are filled with granular materials.

5. The power battery protection plate according to claim 4, characterized in that: The size of the particles is 1-70 microns; The particles are rubber particles.

6. The power battery protection plate according to claim 4, characterized in that: The buffer layer containing a sawtooth structure means that a sawtooth structure is provided on the upper surface and / or the lower surface of the buffer layer.

7. The power battery protection plate according to claim 1, characterized in that: The buffer layer has a hardness of 50-80A and a thickness of 0.5-2mm.

8. The power battery protection plate according to any one of claims 4 to 7, characterized in that: The buffer layer material is at least one of TPV, TPU and TPE.

9. The power battery protection plate according to claim 1, characterized in that: The first adhesive film layer and / or the second adhesive film layer has a grammage of 60-150 gsm; the first adhesive film and / or the second adhesive film is a PP adhesive film.

10. The power battery protection plate according to claim 1, characterized in that: The thickness of the metal plate is 0.28 mm to 4.0 mm.

11. The power battery protection plate according to claim 1, characterized in that: The bulk density of the honeycomb core layer is 40 kg / m 3 ~150kg / m 3 , thickness is 5mm-25mm.

12. A battery pack, characterized in that: The battery pack comprises a tray and a protective plate as described in any one of claims 1 to 11, wherein the protective plate is mounted on the tray.

13. A vehicle, characterized in that: It comprises a battery pack and a power battery protection plate as described in any one of claims 1 to 11 and arranged below the battery pack.

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