Traction battery protective plate, and battery pack and vehicle including same

Abstract

A traction battery protective plate, and a battery pack and a vehicle including same. The protective plate sequentially comprises, from bottom to top, a first surface layer (1), a buffer layer (4), a first adhesive film layer (6), a metal plate layer (3), a second adhesive film layer (7), a honeycomb core layer (2) and a second surface layer (5). A combination of multiple structures is used, such that the protective plate has the effect of gradient energy absorption, thereby improving impact resistance of the protective plate; different materials can be combined on the basis of different application scenarios so as to meet different requirements; and the thickness of a product has designability, thereby achieving customized preparation on the basis of requirements for mounting dimensions.

Description

A power battery protection plate, a battery pack comprising the same and a vehicle TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially a kind of power battery protection plate, and the battery pack and vehicle comprising it. BACKGROUND

[0002] Under the background of global natural resources and oil resources increasingly grim, new energy vehicles, led by electric vehicles, begin to stand out, compared with traditional fuel vehicles, use electric energy, do not produce carbon monoxide, carbon dioxide and other gases that harm the environment, reduce environmental pollution. The protection plate is installed in the lower part of the vehicle body, and is the bearing of the new energy vehicle power battery box, for protecting the battery box from damage when subjected to external impact, extrusion. At present, the protection plate of the automobile mainly adopts metal alloy material, but the weight is large, which greatly reduces the endurance mileage of the battery. Moreover, the chassis often contacts with rainwater, oil stains and the like, which can cause continuous corrosion of the metal parts and bring safety hazards. Continuous fiber reinforced thermoplastic composite material has been widely used in automobile industry, aerospace, military industry, electronics and many other fields due to its light weight, high stiffness, high toughness, recyclability and the like. However, pure thermoplastic composite material has poor ductility in the face of stone and sharp object impact, and cannot well protect the battery. TECHNICAL PROBLEM

[0003] The utility model solves the technical problem to provide a kind of power battery protection plate, and the battery pack and vehicle comprising it. TECHNICAL SOLUTION

[0004] The utility model solves the technical problem and adopts the technical scheme that provides a kind of power battery protection plate, the protection plate includes buffer layer, honeycomb core layer and the metal plate layer between buffer layer and honeycomb core layer, wherein one or more than one first adhesive film layer is arranged between the honeycomb core layer and the metal plate layer;One or more than one second adhesive film layer is arranged between the buffer layer and the metal plate layer, and 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, and the honeycomb core layer is close to the battery layer.

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

[0007] The first surface layer is arranged on the upper surface of the honeycomb core layer, and 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 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 layers.

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

[0011] The buffer layer contains a sawtooth structure, and the buffer layer randomly contains cavities filled with granular materials.

[0012] The buffer layer contains a sawtooth structure, and the buffer layer randomly contains cavities 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 and achieving better energy absorption effect, 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 sawtooth structure on the upper surface and / or lower surface of the buffer layer is provided with a sawtooth structure.

[0015] The hardness of the buffer layer is 50~80A, and the thickness is 0.5~2mm. The buffer layer in this hardness range has good compression resistance, and when it is hot-pressed and compounded, it can reduce the change of the thickness of the buffer layer; the thickness range ensures that the overall thickness of the protective plate is not large 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 can better bond the metal plate layer and the honeycomb core layer and the buffer layer, respectively.

[0018] The grammage of the first adhesive film layer and / or the second adhesive film layer is 60-150gsm. Too low grammage affects the bonding effect of the metal plate layer and the honeycomb core and the buffer layer, and too high grammage increases the weight of the product, and the bonding effect cannot be further improved.

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

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

[0021] The adoption of the PP adhesive film enables the buffer layer and the metal plate layer and the honeycomb core layer and the metal plate layer to have good bonding performance.

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

[0023] Further, the metal plate layer material is a steel plate, an aluminum alloy plate, a cold-rolled plate, or a galvanized plate, such as an aluminum alloy plate referring 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 -150 kg / m 3 , and the thickness is 5mm-25mm.

[0025] The utility model discloses a battery pack, the battery pack includes the tray and as any one of the protective plate, the protective plate is installed on the tray.

[0026] The utility model discloses a vehicle, including the battery group and being located below the battery group any power battery protective plate. Beneficial effects

[0027] Compared with the prior art, the utility model has the following advantages and positive effects: the utility model adopts the combination of multiple structures, so that the bottom protective plate has the function of gradient energy absorption (when the bottom of the bottom protective plate is impacted, the second surface layer absorbs part of the impact energy through the fracture of the fiber and the cracking of the thermoplastic resin, then the buffer layer absorbs part of the impact energy through deformation and tearing, then the interface between the adhesive film and the metal plate absorbs energy, then the steel plate absorbs energy through fracture, then the honeycomb core absorbs energy through extrusion deformation, and finally the first surface layer absorbs energy through the fracture of the fiber and the cracking of the thermoplastic resin), thereby improving the impact resistance of the bottom protective plate, and different combinations of materials can be made according to different application scenarios to meet different requirements; the thickness of the product is designable, and customized preparation can be realized according to the requirements of the installation size. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is a structural schematic view 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;

[0029] Fig. 2 is a structural schematic view of the buffer layer; wherein 4-1 is a cavity, and 4-2 is a particle. Embodiments of the present application

[0030] The utility model is further explained below in combination with specific embodiments. It should be understood that these embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the claims attached to the present application.

[0031] The embodiment of the utility model relates to a power battery protection plate sequentially comprising: first face layer 1, honeycomb core layer 2, first adhesive film layer 6, metal plate layer 3, second adhesive film layer 7, buffer layer 4, second face layer 5.

[0032] Wherein first face layer 1 is close to battery face layer, and second face layer is far from battery face layer, and closer to ground.

[0033] The buffer layer contains a sawtooth structure, improves the impact resistance of the material, and reduces the deformation amount, and the buffer layer randomly has cavities, and the cavities are filled with granular materials, which improves the energy absorption capacity of the material by physical toughening. Alternatively, the sawtooth structure in the buffer layer can be provided on the upper surface of the buffer layer, the lower surface of the buffer layer or both the upper and lower surfaces of the buffer layer. The first adhesive film layer and the second adhesive film layer function to better bond the steel plate with the honeycomb core layer and the buffer layer. The honeycomb core layer improves the overall stiffness and cushioning resistance of the material, and the compressibility of the honeycomb core layer and the buffer layer expands the adaptability of the parts.

[0034] The protection plate of the embodiment of the utility model, in some specific embodiments, the materials of the first face layer 1 and the second face layer 5 are both continuous fiber reinforced thermoplastic resin composite materials, which combines the continuous fiber reinforced thermoplastic resin composite material face layer and the metal plate layer, avoiding the short board of some performance brought by single material.

[0035] The protection plate of the embodiment of the utility model, in some specific embodiments, the buffer layer 4 randomly has cavities, and the cavities are filled with granular materials, and the size of the granules can be 1-70 microns; the granules are rubber granules.

[0036] The hardness of the buffer layer 4 can be 50~80A, and the thickness can be 0.5~2mm, for example, the thickness of the buffer layer 4 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm or 2 mm, etc.

[0037] The protective plate of the specific embodiment of the utility model, in some specific embodiments, the gram weight of the first adhesive film layer 6 and the second adhesive film layer 7 is 60-150gsm, for example, the gram weight of the adhesive film layer is 60gsm, 70gsm, 80gsm, 90gsm, 100gsm, 110gsm, 120gsm, 130gsm, 140gsm or 150gsm etc., which guarantees the bonding and lightweight effect.

[0038] The protective plate of the specific embodiment of the utility model, in some specific embodiments, the first adhesive film layer 6 is one layer or more than one layer.

[0039] The protective plate of the specific embodiment of the utility model, in some specific embodiments, the second adhesive film layer 7 is one layer or more than one layer.

[0040] The thickness of the first adhesive film layer and the second adhesive film layer can be the same or different.

[0041] The protective plate of the specific embodiment of the utility model, in some specific embodiments, the first adhesive film layer 6 and the second adhesive film layer 7 can select, for example, PP adhesive film, and the first PP adhesive film layer and the second PP adhesive film layer realize the combination of steel and plastic of materials, realize the lightweight of products, and can also meet the requirement of high performance.

[0042] The protective plate of the specific embodiment of the utility model, in some specific embodiments, the material of the metal plate layer 3 is steel plate or aluminum alloy plate.

[0043] 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.

[0044] 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 40kg / m 3 ~150kg / m 3 , and the thickness can be 5mm-25mm; for example, the thickness of the honeycomb core layer can be 5mm, 10mm, 15mm, 20mm or 25mm etc.

[0045] Comparative example 1

[0046] The power battery protection plate from bottom to top in turn: in turn includes: first surface layer 1, honeycomb core layer 2, first adhesive film layer 6, metal plate layer 3, buffer layer 4, second surface layer 5. Wherein the first surface layer 1 is close to the battery surface layer, the second surface layer is far away from the battery surface layer, and is closer to the ground.

[0047] Because there is no second adhesive film layer, the buffer layer and the metal plate layer are not bonded after compounding, resulting in delamination, and there is a risk of falling during vehicle driving.

[0048] Comparative Example 2

[0049] The power battery protection plate from bottom to top in turn: in turn includes: first surface layer 1, honeycomb core layer 2, metal plate layer 3, second adhesive film layer 7, buffer layer 4, second surface layer 5. Wherein the first surface layer 1 is close to the battery surface layer, the second surface layer is far away from the battery surface layer, and is closer to the ground.

[0050] Because there is no first adhesive film layer, the honeycomb core and the metal plate layer cannot be bonded after compounding, resulting in delamination, poor impact resistance of the bottom protection plate, and the steel protection cannot be fixed, which also has a risk of falling.

[0051] Comparative Example 3

[0052] The power battery protection plate in turn includes: first surface layer 1, honeycomb core layer 2, first adhesive film layer 6, metal plate layer 3, second adhesive film layer 7, buffer layer 4, second surface layer 5. Wherein the first surface layer 1 is close to the battery surface layer, the second surface layer is far away from the battery surface layer, and is closer to the ground.

[0053] Wherein only the thickness of the first adhesive film layer is greater than the metal plate layer, not only increases the thickness of the bottom protection plate, but also more easily appears the internal damage of the PP adhesive film layer, resulting in poor adhesion performance of the metal plate and the honeycomb core.

[0054] Wherein only the thickness of the second adhesive film layer is greater than the metal plate layer, not only increases the thickness of the bottom protection plate, but also more easily appears the internal damage of the PP adhesive film layer, resulting in poor adhesion performance of the metal plate and the buffer layer.

[0055] Comparative Example 4

[0056] The power battery protection plate from bottom to top in turn: the power battery protection plate in turn includes: first surface layer 1, honeycomb core layer 2, first adhesive film layer 6, metal plate layer 3, second adhesive film layer 7, buffer layer 4, second surface layer 5. Wherein the first surface layer is far away from the battery surface layer, and is closer to the ground; the second surface layer 1 is close to the battery surface layer. The bottom protection plate cannot play a good role in protecting the battery, because there is no buffer layer to absorb a large amount of impact energy, resulting in rupture of the metal plate and large deformation, and there is a risk of piercing the battery by the metal sharp object.

Claims

1. A protection plate for a power battery, characterized in that, The protective plate comprises a buffer layer, a honeycomb core layer and a metal plate layer 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 plate layer; wherein the buffer layer is far away from the battery layer and closer to the ground; 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 comprises a surface layer; the surface layer comprises a first surface layer and / or a second surface layer; wherein the first surface layer is the upper surface layer of the protective plate, and the second surface layer is the lower surface layer of the protective plate.

3. The power cell guard plate of claim 2, wherein, The surface layer is one or more layers of continuous fiber reinforced thermoplastic resin composite material.

4. The power cell guard plate of claim 1, wherein, The buffer layer contains a serrated structure, and the buffer layer randomly contains cavities filled with granular materials.

5. The power cell guard plate of claim 4, wherein, The size of the particles is 1-70 microns; the particles are rubber particles.

6. The power cell guard plate of claim 4, wherein, The serrated structure of the buffer layer is a serrated structure on the upper surface and / or lower surface of the buffer layer.

7. The power cell guard plate of claim 1, wherein, The hardness of the buffer layer is 50-80A, and the thickness is 0.5-2mm.

8. The protective plate for power batteries according to any one of claims 4-7, characterized in that, The buffer layer material is at least one of TPV, TPU and TPE.

9. The power cell guard plate of claim 1, wherein, The grammage of the first adhesive film layer and / or the second adhesive film layer is 60-150gsm; the first adhesive film and / or the second adhesive film is a PP adhesive film.

10. The power cell guard plate of claim 1, wherein, The thickness of the metal plate is 0.28mm-4.0mm.

11. The power cell guard plate of claim 1, wherein, The bulk density of the honeycomb core is 40 kg / m 3 150 kg / m 3 with a thickness of 5 mm - 25 mm.

12. A battery pack, characterized by, The battery pack comprises a tray and the protective plate according to any one of claims 1-11, and the protective plate is installed on the tray.

13. A vehicle characterized by comprising: The power battery protective plate according to any one of claims 1-11 is arranged below the battery pack.

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