Power battery bottom protection plate with sandwich structure

Abstract

A power battery bottom protection plate of a sandwich structure comprises a supporting layer, the front face and the back face of the supporting layer are each provided with a continuous PET composite long fiber layer in an adhesive mode through a modified adhesive film, the density of the supporting layer ranges from 0.07 g / cm < 3 > to 7.85 g / cm < 3 >, and the density of the continuous PET composite long fiber layers ranges from 0.1 g / cm < 3 > to 0.6 g / cm < 3 >. The continuous PET composite long fiber layer is formed by hot-pressing and bonding continuous PET composite long fibers, each continuous PET composite long fiber comprises a PET fiber core and a low-melting-point PET skin layer, and the PET fiber core is wrapped in the low-melting-point PET skin layer. The power battery has the beneficial effects that the impact resistance and the corrosion resistance are good, and the supporting layer can play a buffering role to reduce a part of impact force, so that the continuous PET composite long fiber layer on the reverse side of the supporting layer is protected from being broken by heavy objects, and the power battery is protected from being damaged; and the weight of the power battery bottom protection plate is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile parts, especially to a power battery bottom guard plate of sandwich structure. BACKGROUND

[0002] The power battery bottom guard plate is installed at the bottom of the electric vehicle, and the main function of the power battery bottom guard plate is to protect the power battery pack of the vehicle from invasion of foreign matters such as stones, water and sand, and the bottom guard plate also needs to have the performance requirements of fire resistance and corrosion resistance.

[0003] There are two conventional schemes for the power battery bottom guard plate at present.

[0004] ①1.0mm steel plate + fireproof coating scheme, the size of a complete power battery bottom guard plate is about 2200*1400mm, i.e. 3m 2 , the density of the steel plate is about 7.85g / cm 3 , so the weight of the steel plate is about 24.178kg; the density of the fireproof spraying material is about 1.78g / cm 3 , so the weight of the product with a thickness of 1mm is about 5.482kg; therefore, the weight of a complete power battery bottom guard plate is 29.66kg. On the other hand, the adhesion between the fireproof spraying material and the steel plate is poor, and the coating is easy to peel off, fall off and break, so that the steel plate is exposed to the external environment and corroded.

[0005] ②3.0-8.0mm aluminum alloy scheme, the size of a complete power battery bottom guard plate is about 2200*1400mm, i.e. 3m 2 , the density of the aluminum alloy is about 2.7g / cm 3 , so the weight of the aluminum alloy is about 24.948kg-66.528kg, and therefore the weight of the entire product is high, and on the other hand, the oxide film on the surface of the aluminum alloy is easy to break, so that the metal is exposed to the external environment and corroded.

[0006] Therefore, the power battery bottom guard plate of the prior art electric vehicle is heavy in overall weight and easy to corrode. INVENTION CONTENTS

[0007] The utility model aims at overcoming the above problems existing in the prior art, and provides a power battery bottom guard plate of sandwich structure.

[0008] In order to achieve the above technical purposes and effects, the utility model realizes the following technical scheme:

[0009] The utility model provides a power battery bottom guard plate of sandwich structure, including support layer, the positive and negative two sides of support layer respectively through the modified adhesive film bonding one layer density is continuous PET composite long fiber layer, the density of support layer is 0.07~7.85g / cm3, the density of continuous PET composite long fiber layer is 0.1-0.6g / cm3;Continuous PET composite long fiber layer is formed by continuous PET composite long fiber hot pressing bonding, and the continuous PET composite long fiber includes PET fiber core and low melting point PET skin layer, and the PET fiber core is wrapped in the low melting point PET skin layer.

[0010] One preferable mode is that the thickness of the support layer is 0.8mm-8mm, and the support layer is one of polypropylene honeycomb board, polypropylene round hole board, aluminum honeycomb board, polyethylene terephthalate foam board, polyurethane foam board and steel plate.

[0011] Another preferable mode is that the density of the support layer is 0.07-1.35g / cm3, and the thickness of the support layer is 4mm-8mm. The support layer is one of polypropylene honeycomb board, polypropylene round hole board, aluminum honeycomb board, polyethylene terephthalate foam board and polyurethane foam board.

[0012] The continuous PET composite long fibers are arranged in a wave shape, or arranged in a horizontal and vertical cross shape, or arranged in disorder.

[0013] The thickness of the continuous PET composite long fiber layer on the front and back of the support layer is the same, or the thickness of the continuous PET composite long fiber layer on the front of the support layer is greater than that on the back of the support layer, or the thickness of the continuous PET composite long fiber layer on the front of the support layer is less than that on the back of the support layer.

[0014] The thickness of the continuous PET composite long fiber layer is 0.8mm-2mm.

[0015] One preferable mode is that the density of the continuous PET composite long fiber layer is 0.1-0.6g / cm3.

[0016] The utility model discloses the beneficial effect is:

[0017] 1, the appearance surface uses the continuous PET composite long fiber layer of skin-core structure, and through the control forming temperature makes low melting point PET skin layer melt and plays the bonding effect, and the PET fiber core does not melt and plays the reinforcing effect, so as to realize the impact resistance and corrosion resistance;

[0018] 2. Utilizing the characteristics of the sandwich structure, an impact-resistant support layer is set between the two continuous PET composite long fiber layers. When a heavy object impacts the continuous PET composite long fiber layer on the front side of the support layer, the support layer can play a buffering role to reduce part of the impact force, thereby protecting the continuous PET composite long fiber layer on the back side of the support layer from being broken by the heavy object and protecting the power battery from damage.

[0019] 3. The support layer uses a continuous PET composite long fiber layer with a density of 0.1-0.6 g / cm³ on both sides, which is only 5.56% to 33.71% of the density of fire-retardant coatings in the prior art, thereby reducing the weight of the power battery bottom protection plate. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the bottom guard plate of the power battery in Embodiment 1 of this utility model;

[0022] Figure 2 This is a schematic diagram of the continuous PET composite long fiber structure in Embodiment 1 of this utility model;

[0023] Explanation of the labels in the diagram: 1. Support layer; 2. Modified film; 3. Continuous PET composite long fiber layer; 4. PET fiber core; 5. Low melting point PET skin layer; 6. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 and Figure 2 The first embodiment shown is a sandwich structure power battery bottom cover plate, including a support layer 1, and a continuous PET composite long fiber layer 3 is bonded to both sides of the support layer 1 by a modified adhesive film 2.

[0026] The support layer 1 is an aluminum honeycomb panel. At this time, the density of the support layer 1 is 0.07 g / cm³, and the thickness of the support layer 1 is 8 mm.

[0027] The continuous PET composite long fiber layer 3 on both sides of the support layer 1 has the same thickness. The thickness of the continuous PET composite long fiber layer 3 is 2 mm, and the density of the continuous PET composite long fiber layer 3 is 0.6 g / cm³.

[0028] The continuous PET composite long fiber layer 3 is formed by hot pressing and bonding of continuous PET composite long fibers 4, and the continuous PET composite long fibers 4 are arranged in a cross pattern.

[0029] The continuous PET composite long fiber 4 comprises a PET fiber core 5 and a low-melting-point PET skin layer 6, and the PET fiber core 5 is wrapped in the low-melting-point PET skin layer 6. When the continuous PET composite long fiber 4 is hot pressed, the low-melting-point PET skin layer 6 is bonded together.

[0030] According to the size of a complete power battery bottom guard plate of 2200*1400mm, the weight of the power battery bottom guard plate in the first embodiment is 9.1168kg, so the weight of the power battery bottom guard plate in the first embodiment is much lower than the weight of the steel plate plus fireproof coating scheme and the weight of the aluminum alloy scheme in the prior art, achieving the goal of reducing the weight of the power battery bottom guard plate.

[0031] In the second embodiment, a sandwich structure power battery bottom guard plate comprises a support layer, and the front and back surfaces of the support layer are respectively bonded with a continuous PET composite long fiber layer through a modified adhesive film.

[0032] The support layer is a steel plate, and the density of the support layer 1 is 7.85g / cm3, and the thickness of the support layer is 0.8mm.

[0033] The thickness of the continuous PET composite long fiber layer on the front surface of the support layer is greater than the thickness of the continuous PET composite long fiber layer on the back surface of the support layer, and the thickness of the continuous PET composite long fiber layer on the front surface of the support layer is 2mm, and the thickness of the continuous PET composite long fiber layer on the back surface of the support layer is 1.5mm. The density of the continuous PET composite long fiber layer is 0.1g / cm3.

[0034] The continuous PET composite long fiber layer is formed by hot pressing and bonding of continuous PET composite long fibers, and the continuous PET composite long fibers are arranged in a wave shape.

[0035] The continuous PET composite long fiber comprises a PET fiber core and a low-melting-point PET skin layer, and the PET fiber core is wrapped in the low-melting-point PET skin layer.

[0036] According to the size of a complete power battery bottom guard plate of 2200*1400mm, the weight of the power battery bottom guard plate in the second embodiment is 20.4204kg, so the weight of the power battery bottom guard plate in the second embodiment is lower than the weight of the steel plate plus fireproof coating scheme and the weight of the aluminum alloy scheme in the prior art, achieving the goal of reducing the weight of the power battery bottom guard plate.

[0037] In the third embodiment, a sandwich structure power battery bottom guard plate comprises a support layer, and the front and back surfaces of the support layer are respectively bonded with a continuous PET composite long fiber layer through a modified adhesive film.

[0038] The support layer is a polyethylene terephthalate foamed sheet, the density of the support layer is 1.35 g / cm3, and the thickness of the support layer is 4 mm.

[0039] The continuous PET composite long fiber layer is formed by hot pressing and bonding of continuous PET composite long fibers, and the continuous PET composite long fibers are arranged in disorder.

[0040] The thickness of the continuous PET composite long fiber layer on the front surface of the support layer is less than that on the back surface of the support layer, the thickness of the continuous PET composite long fiber layer on the front surface of the support layer is 0.8 mm, the thickness of the continuous PET composite long fiber layer on the front surface of the support layer is 1 mm, and the density of the continuous PET composite long fiber layer is 0.5 g / cm3.

[0041] The continuous PET composite long fiber comprises a PET fiber core and a low-melting-point PET skin layer, and the PET fiber core is wrapped in the low-melting-point PET skin layer.

[0042] According to the size of the complete power battery bottom guard plate of 2200*1400 mm, the weight of the power battery bottom guard plate in this embodiment is 19.404 kg, so the weight of the power battery bottom guard plate in this embodiment is lower than that of the existing technology using a steel plate with a fireproof coating scheme and an aluminum alloy scheme, and the target of reducing the weight of the power battery bottom guard plate is achieved.

[0043] In embodiment four, a sandwich structure power battery bottom guard plate comprises a support layer, and the front and back surfaces of the support layer are respectively bonded with a continuous PET composite long fiber layer through a modified adhesive film.

[0044] The support layer is a polypropylene round hole plate, the density of the support layer is 0.92 g / cm3, and the thickness of the support layer is 5 mm.

[0045] The continuous PET composite long fiber layer is formed by hot pressing and bonding of continuous PET composite long fibers, and the continuous PET composite long fibers are arranged in disorder.

[0046] The thickness of the continuous PET composite long fiber layer on the front surface of the support layer is greater than that on the back surface of the support layer, the thickness of the continuous PET composite long fiber layer on the front surface of the support layer is 1.5 mm, the thickness of the continuous PET composite long fiber layer on the front surface of the support layer is 1 mm, and the density of the continuous PET composite long fiber layer is 0.4 g / cm3.

[0047] The continuous PET composite long fiber comprises a PET fiber core and a low-melting-point PET skin layer, and the PET fiber core is wrapped in the low-melting-point PET skin layer.

[0048] According to the size of the complete power battery bottom guard plate being 2200*1400mm, the weight of the power battery bottom guard plate in the third embodiment is 17.248kg, so the weight of the power battery bottom guard plate in the fourth embodiment is lower than the weight of the scheme of using the steel plate with the fireproof coating and the weight of the aluminum alloy scheme in the prior art, and the target of reducing the weight of the power battery bottom guard plate is achieved.

[0049] In addition to the four embodiments of the plate material, the support layer can also select a polypropylene honeycomb plate or a polyurethane foaming plate.

[0050] The basic principle, main features and advantages of the utility model are shown and described above. The skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the claimed utility model.

Claims

1. A sandwich-structured bottom cover for a power battery, characterized in that: The support layer is adhered to a continuous PET composite long fiber layer with a density of 0.1-0.6 g / cm3 on both sides by a modified adhesive film, the density of the support layer is 0.07-7.85 g / cm3, and the continuous PET composite long fiber layer is formed by hot pressing and adhering continuous PET composite long fibers.

2. The power battery bottom guard plate according to claim 1, characterized in that: The thickness of the support layer is 0.8-8 mm, and the support layer is one of a polypropylene honeycomb board, a polypropylene round hole board, an aluminum honeycomb board, a polyethylene terephthalate foam board, a polyurethane foam board, and a steel plate.

3. The power battery bottom guard plate according to claim 1, characterized in that: The density of the support layer is 0.07-1.35 g / cm3, the thickness of the support layer is 4-8 mm, and the support layer is one of a polypropylene honeycomb board, a polypropylene round hole board, an aluminum honeycomb board, a polyethylene terephthalate foam board, and a polyurethane foam board.

4. The power battery underguard according to claim 1, characterized in that: The continuous PET composite long fibers are arranged in a wave shape, or arranged in a horizontal and vertical cross shape, or arranged in disorder.

5. The power battery underguard according to claim 1, characterized in that: The thickness of the continuous PET composite long fiber layer on the front and back sides of the support layer is the same, or the thickness of the continuous PET composite long fiber layer on the front side of the support layer is greater than that on the back side of the support layer, or the thickness of the continuous PET composite long fiber layer on the front side of the support layer is less than that on the back side of the support layer.

6. The power battery underguard according to claim 1, characterized in that: The thickness of the continuous PET composite long fiber layer is 0.8-2 mm.

7. The power battery underguard according to claim 1, characterized in that: The density of the continuous PET composite long fiber layer is 0.1-0.6 g / cm3.

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