A multi-layer structure composite material battery box for vehicle

Abstract

The utility model discloses a kind of multi-layer structure composite material battery box for vehicle, including box upper cover, support strip and lower box, the lower box is three-layer laminated structure, it is first composite material layer, foaming layer and second composite material layer in order from box inside to box outside;The support strip includes main support strip and connecting strip, main support strip is two in longitudinal embedding installation in the top surface both sides edge of first composite material layer, connecting strip is transversely arranged between two main support strips, and is transversely embedded in installation in the top surface middle part of first composite material layer;The reinforcing layer of corrugated structure is set in the top surface both ends of first composite material layer.The utility model is composed of different three kinds of materials by sandwich sandwich structure, can change the material composition of product wide range, change performance, improve strength, reduce overall weight;Lower box and the dovetail structure of support strip can change product local material distribution, increase overall strength.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery box technology, specifically to a multi-layer composite material vehicle battery box. Background Technology

[0002] Currently, most automotive battery boxes have high requirements for mechanical strength and flame retardant performance, and are generally made of metal. However, battery boxes made of composite materials have the following problems: 1) They are too heavy, and the strength of composite materials is too weak to meet automotive standards; 2) To meet flame retardant requirements, the strength of the material will be correspondingly reduced, and it is difficult to satisfy both strength and flame retardant performance at the same time. Utility Model Content

[0003] The purpose of this invention is to provide a high-strength, lightweight, multi-layer composite material battery box for automobiles.

[0004] To achieve the above objectives, this utility model is specifically implemented through the following technical solution:

[0005] A multi-layer composite material automotive battery box includes a top cover, support strips, and a lower box. The lower box has a three-layer stacked structure, consisting of a first composite material layer, a foam layer, and a second composite material layer from the inside to the outside. The support strips include main support strips and connecting strips. The main support strips are two longitudinally embedded along the two sides of the top surface of the first composite material layer. The connecting strips are laterally positioned between the two main support strips and laterally embedded in the middle of the top surface of the first composite material layer. Dovetail tenons are provided at the bottom of the connecting strips, the sides of the main support strips, and the bottom of the main support strips, and the dovetail tenons are embedded within the first composite material layer.

[0006] The top surface of the first composite material layer is provided with a corrugated bottom reinforcement layer at both ends; the bottom reinforcement layer is a three-layer structure, which includes a prepreg material layer on the top surface, a spring steel wire mesh in the middle and an SMC composite material layer on the bottom surface; the total thickness of the bottom reinforcement layer 4 is 3-8mm.

[0007] Furthermore, the support strip is made of a material with a tensile strength of 400 MPa or higher.

[0008] Furthermore, the support strip is made of epoxy resin composite material or metal material.

[0009] Furthermore, the first composite material layer is made of SMC composite material.

[0010] Furthermore, the outer edges of the first composite material layer of the lower housing are provided with protruding vehicle body connecting parts, and at least three sets of connecting holes are opened on each side of the vehicle body connecting part. The vehicle body connecting part is set with a corrugated structure along the connecting holes inward.

[0011] Furthermore, the second composite material layer is made of STM polyurethane composite material.

[0012] This invention utilizes a sandwich structure composed of three different materials, which can alter the material composition of the product over a wide range, changing its performance, increasing strength, and reducing overall weight. The inner layer ensures flame retardancy, airtightness, strength, and component installation; the outer layer ensures strength, wind resistance and noise reduction, and puncture resistance; the middle layer ensures overall structural stability and a certain degree of thermal insulation. The dovetail joint structure between the lower housing and the support strip can change the local material distribution of the product, increasing overall strength; the radial corrugated structure of the body connection can solve the structural strength problem at the lifting lug position, resulting in a lightweight and high-strength product. Attached Figure Description

[0013] Figure 1 This is an exploded view of the overall structure of this utility model.

[0014] In the diagram, 1-box top cover; 2-support strip; 21-main support strip; 22-connecting strip; 23-dovetail tenon structure; 3-lower box; 31-first composite material layer; 32-foaming layer; 33-second composite material layer; 4-bottom reinforcing layer; 5-vehicle body connection part; 51-connecting hole. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0018] like Figure 1As shown, this utility model discloses a multi-layer composite material automotive battery box, comprising an upper cover 1, a support strip 2, and a lower box 3. The upper cover 1 and the lower box 3 are sealed at their edges by sealing rings and then connected by bolts. The lower box 3 has a three-layer stacked structure, consisting of a first composite material layer 31, a foam layer 32, and a second composite material layer 33 from the inside of the box to the outside. These layers can be composed of three different materials, allowing for a wide range of changes in the material composition, altering performance, increasing strength, and reducing overall weight. The foam layer 32 ensures overall structural stability and provides a certain degree of thermal insulation.

[0019] The support strip 2 includes a main support strip 21 and a connecting strip 22. The main support strip 21 consists of two longitudinally embedded strips along the two sides of the top surface of the first composite material layer 31. The connecting strip 22 is horizontally positioned between the two main support strips 21 and is horizontally embedded in the middle of the top surface of the first composite material layer 31. The support strip 2 is formed first and then placed on the lower box 3 in the mold for molding together. After molding, the support strip 2 is inverted and will not come out.

[0020] To improve the structural strength of the lower battery box 3, a corrugated bottom reinforcing layer 4 is provided at both ends of the top surface of the first composite material layer 31. Preferably, the bottom reinforcing layer 4 has a three-layer structure, including a prepreg material layer on the top surface, a spring steel wire mesh in the middle, and an SMC composite material layer on the bottom surface. The total thickness of the bottom reinforcing layer is 3-8 mm; the spring steel wire mesh uses 65Mn spring steel wire with a wire diameter of 0.9 mm. The bottom reinforcing layer 4 has a corrugated, uneven shape to enhance the stress in this direction. The prepreg material and SMC are integrally formed to further enhance the strength at this location. Preferably, the support strip 2 is made of a material with a tensile strength of 400 MPa or higher, and the support strip 2 provides overall structural support for the lower battery box 3. More preferably, the support strip 2 is made of epoxy resin composite material or metal material.

[0021] Preferably, dovetail tenon structures 23 are provided at the bottom of the connecting strip 22, the side and bottom of the main support strip 21. The dovetail tenon structures are embedded in the first composite material layer 31, so that the support strip 2 and the first composite material layer 31 are firmly connected, preventing them from coming out, and making the connection between the two materials tighter.

[0022] Preferably, the first composite material layer 31 is made of SMC composite material. SMC composite material has the advantages of being lightweight and high-strength, which enables the first composite material layer 31 to have the functions of good flame retardancy, good air tightness, high strength, and reliable component installation.

[0023] Preferably, the outer edges of the first composite material layer 31 of the lower housing 3 are provided with a vehicle body connection part 5 protruding from both sides. At least three sets of connection holes 51 are opened on each side of the vehicle body connection part 5. The vehicle body connection part 5 is set with a corrugated structure along the connection holes inward. The structure of the vehicle body connection part 5 is safe and reliable. The corrugated structure can improve the structural strength of the connection position and achieve the effect of light weight and high strength.

[0024] Preferably, the second composite material layer is made of STM polyurethane composite material, and the second composite material layer 33 has high strength, wind resistance and noise reduction, and puncture resistance. While being lightweight, the STM polyurethane composite material also has the characteristics of high strength and high toughness, ensuring sufficient mechanical properties for the lower housing.

[0025] The specific embodiments described herein are merely illustrative of the invention and are not intended to limit it. Those skilled in the art can make modifications to these embodiments without contributing any inventive step after reading this specification, but such modifications are protected by patent law as long as they fall within the scope of the claims of this invention.

Claims

1. A multi-layer composite material automotive battery box, characterized in that, The enclosure includes a top cover (1), support strips (2), and a lower enclosure (3). The lower enclosure is a three-layer stacked structure, consisting of a first composite material layer (31), a foam layer (32), and a second composite material layer (33) from the inside of the enclosure to the outside. The support strips include main support strips (21) and connecting strips (22). The main support strips are two longitudinally embedded and installed on both sides of the top surface of the first composite material layer. The connecting strips are at least one transversely arranged between the two main support strips, with their bottoms embedded and installed in the middle of the top surface of the first composite material layer. The bottom of the connecting strips, the sides of the main support strips, and the bottom of the main support strips are all provided with dovetail tenon structures (23), which are embedded in the first composite material layer. The top surface of the first composite material layer is provided with a corrugated bottom reinforcement layer (4) at both ends. The bottom reinforcement layer is a three-layer structure, which includes a prepreg material layer on the top surface, a spring steel wire mesh in the middle and an SMC composite material layer on the bottom surface. The total thickness of the bottom reinforcing layer is 3-8 mm.

2. The multi-layer composite material automotive battery box according to claim 1, characterized in that, The support bar is made of a material with a tensile strength of 400 MPa or higher.

3. The multi-layer composite material automotive battery box according to claim 1, characterized in that, The support strip is made of epoxy resin composite material or metal material.

4. The multi-layer composite material automotive battery box according to claim 1, characterized in that, The first composite material layer is made of SMC composite material.

5. The multi-layer composite material automotive battery box according to claim 1, characterized in that, The first composite material layer of the lower box has a protruding vehicle body connection part (5) on both sides of the outer edge. At least three sets of connection holes (51) are opened on each side of the vehicle body connection part. The vehicle body connection part is set as a corrugated structure along the connection holes inward.

6. The multi-layer composite material automotive battery box according to claim 1, characterized in that, The second composite material layer is made of STM polyurethane composite material.

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