Automatic compression molding process for power battery upper box of composite material

Abstract

The invention discloses an automatic compression molding process for a power battery upper box of a composite material. The automatic compression molding process comprises the following steps that 100, epoxy resin continuous glass fiber prepreg of a rapid curing system is selected as a raw material of the power battery upper box; 200, the raw material is preformed through a nylon profiling prefabricated mold so as to obtain a pre-shaped product; and 300, the pre-shaped product is mechanically and automatically transferred to an aluminum mold to finish compression molding. According to the process, mechanical arm automatic transfer of a prepreg preform is realized, the production efficiency is better improved, mass production is realized, no ejection mechanism is designed for the aluminum mold, the mold cost can be greatly reduced, the mold cost under the same product is only 30% of that of a steel mold, the processing period of the aluminum mold is only 30% of that of the steel mold, and the production period of an enterprise is greatly shortened. After being damaged, the aluminum mold can be rapidly repaired again through machining and surface lowering, and the actual use cost andthe maintenance cost are reduced.

Description

technical field [0001] The invention relates to the technical field of power battery production, in particular to an automatic compression molding process for a power battery upper case made of composite materials. Background technique [0002] At present, the composite material upper box of the new energy vehicle power battery mostly adopts the molding process. The existing process plan is mold + core mold for rapid molding. The core mold is a thin-walled structure of about 10mm. The specific method is to fix the mold to the press equipment. The mold is raised to the molding temperature, and the epoxy resin glass fiber prepreg is cut into slices according to the drawings, and the sheets are laid on the mandrel according to the order and technical requirements, and then the mandrel is transferred to the mold by the manipulator, and pressurized and solidified Finally, the core mold is removed, and the product is taken out after the external temperature is cooled. [0003] (1...

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Problems solved by technology

[0003] (1) The existing mold is made of steel, and the heating method is through the profiling hot runner in the mold. Most of the upper box products have a three-dimensional structure. The profiling hot runner heating scheme cannot ensure the temperature uniformity of the mold surface. Therefore, in order to ensure product quality, Need to extend the overall molding time to more than 10min

[0004] (2) Epoxy resin glass fiber prepreg is easy to stick and deform at room temperature, and the manipulator cannot transfer it directly, so the core mold transfer scheme is used, but the core mold is designed to be thinner in order to ensure thermal conductivity, so in The life of the mandrel is short in long-term use

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