Mass production method of automobile composite material battery box sandwich structure

Abstract

The invention discloses a mass production method of an automobile composite material battery box sandwich structure. By using high-performance fiber fabric and reasonable structural layer laying design, the light weight of a battery box body can be realized to a great extent; meanwhile, when an upper pressing plate and a lower pressing plate of a composite material are molded, a sandwich layer, afireproof layer and / or an electromagnetic shielding layer, rapid curing resin and the high-performance fiber fabric are combined to be cured and molded at one time, so that better flame-retarding, fireproof and heat-insulation effects and good electromagnetic shielding performance are realized; a one-time rapid curing and molding manner is adopted through a wet-process mould pressing process, so that the takt time is short and process steps are simplified; the requirements on the light weight of the battery box body, the fireproof performance of the battery box and the electromagnetic shielding performance are met and the production cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of automobile battery boxes, and in particular relates to a mass production method of a sandwich structure of an automobile composite material battery box. Background technique [0002] With the continuous growth of the electric vehicle market and the continuous improvement of the safety and energy density ratio requirements of the battery system, higher requirements are put forward for the lightweight and fireproof performance of the battery box. It is difficult for a single material to meet the requirements of light weight of the car and thermal runaway fire prevention of the battery box at the same time. For example, metal materials do not meet the requirements of lightweight, while aluminum alloy and glass fiber SMC materials are difficult to meet the requirements of thermal runaway with a single material. In order to solve the box components that meet the requirements of both lightweight and thermal run...

AI Technical Summary

Problems solved by technology

The original single material is difficult to meet the requirements of light weight of the car and fire prevention of thermal runaway of the battery box at the same time

For example, metal materials do not meet the requirements of lightweight, while aluminum alloy and glass fiber SMC materials are difficult to meet the requirements of thermal runaway with a single material. In order to solve the box components that meet the requirements of both lightweight and thermal runaway fire protection, it is necessary to select materials and implement processes. Taking into account these two requirements; on the other hand, the implementation process is also more complicated, often requires secondary molding or higher molding temperature, such as the way of adding coating on the surface of the component will also have the risk of easy peeling, therefore, not only brings Higher energy consumption, cost, longer takt time, and the risk of stable performance, and it is also difficult to meet product mass production tact and cost requirements to cope with the growing market supply demand

[0003] Electromagnetic wave interference is also an important hidden danger of electric vehicle driving safety.

Although the traditional metal battery box material can meet the electromagnetic shielding performance, its structure is heavy and does not meet the lightweight requirements of new energy vehicles

Although the pure composite material battery box is more in line with the demand for lightweight in structure, its material does not have sufficient electromagnetic shielding, so there is a risk of electromagnetic interference between the battery system and other electrical systems; moreover, the existing The composite material battery box with electromagnetic shielding function basically uses a certain metal electromagnetic shielding layer to give the structure a certain electromagnetic shielding effect. On the one hand, the weight of the metal electromagnetic shielding layer is greater than that of composite materials. On the other hand, Especially for the liquid molding process of composite materials, it is easy to have the problem of resin infiltration, which leads to the appearance of defects and affects the yield of products

Furthermore, the existing battery boxes of composite materials with electromagnetic shielding function basically use metal electromagnetic shielding layers combined with conventional composite material molding processes. On the one hand, the weight of metal electromagnetic shielding layers is relatively large, which affects the The lightweight of the product; on the one hand, it is easy to have the problem of metal and resin infiltration, which leads to defects and affects the yield of the product; on the other hand, the conventional composite material molding process requires a long molding time, usually >30min, which is difficult to meet Takt requirements for mass production

[0004] In addition, in terms of the structure of the composite battery box, especially for larger-sized battery boxes, the overall rigidity is not easy to meet the extrusion requirements, and blindly increasing the stiffness by increasing the thickness of the laminated composite material will directly lead to weight loss. increase, which greatly affects the effect of structural lightweight