The core tip: the new energy car uses carbon fiber composite material instead of aluminum alloy and other metal materials to make battery box. The main purpose is to complete lighter self weight on the premise of improving function: carbon fiber composite material is used for new energy automobile and new energy car to replace aluminum alloy and other metal materials to make battery box, The main purpose is to complete lighter self weight on the premise of progressive function: the battery box of new energy car should not only have enough bearing capacity, but also reduce vibration, corrosion resistance and service life as much as possible under the vehicle condition, so as to reduce the weight of light vehicle body, reduce energy consumption and extend the driving time. To satisfy these demands, on the one hand, it depends on the advantages of the raw materials of carbon fiber composites, on the other hand, it depends on reasonable process plans. The properties of carbon fiber and matrix resin materials vary greatly. The function along the fiber direction and the vertical fiber direction in the single layer composite layer also change greatly, which will constitute the orthogonal anisotropy function. The mechanical parameters of the composite are influenced by many factors, which include the planning and manufacture of the carbon fiber composite.
The layout of carbon fiber composite material for battery box of new energy car is similar to that of laminated plate in principle, which includes: the laying viewpoint, number of layers and the order of laying of each fiber layer. Reasonable lay plan can play the function advantage of carbon fiber composite and ensure the lightweight application of products. For example, in the process of driving new energy cars, the battery box will be subject to the vibration in three directions, i.e. horizontal, vertical and vertical. Choosing different laying plans can change the natural frequency of the battery box, and selecting the appropriate lay plan can also prevent resonance. When manufacturing carbon fiber composite battery box for new energy car, Wuxi Zhishang new material will determine the best lay plan for a specific product by comparing different laying direction, different share of layer and different thickness of layer. In this process, the following aspects will be considered to optimize the layout plan.
The fiber path of battery box of new energy car corresponds to the main stress: when carbon fiber prepreg is selected for laying, the prepreg needs to be cut and then laid again. In the operation process, even if the carbon fiber path cannot be laid thoroughly, the most recent treatment should be carried out according to the holding route. Generally speaking, 45 ° The aspirational fiber route is 45 ° Stress direction, 90 ° The aspirational fiber route is 90 ° Direction of stress. That is, the fiber path of a certain layer should be consistent with the main stress of this layer.
The carbon fiber battery box of new energy car adjusts the laying plan according to specific needs: in different plans, Wuxi Zhishang new materials found that the laying method and view point of view of the carbon fiber composite have certain influence on the structure function. 0 °、± forty-five °、 ninety ° It is a common view of the layer, and ± forty-five ° The addition of the layer in the overall share will enhance the mode and stability of the battery box; Although the influence of the laying order on the mode quantity of the battery box is limited, it has a significant influence on the maximum stress value, especially when 0 ° Fiber ratio at the outermost side ± forty-five ° The fiber had more obvious influence on the outermost side; Symmetrical layer is helpful to improve the natural frequency of the battery box. The carbon fiber layer method on the outer layer of the battery box has a great influence on the stress value of the box. With the addition of the thickness of the layer, the stability function of the battery box will be improved.
