Forming die head of battery barrier film

Abstract

The invention particularly refers to a forming die head of a battery barrier film, and belongs to the technical field of extrusion forming dies. The forming die head comprises an upper die and a lowerdie. The upper die and the lower die are each provided with a row of heating sticks in the longitudinal direction. A die cavity formed after die assembly of the upper die and the lower die is an extrusion flow channel. The extrusion flow channel is divided into a preheating section, a material extrusion section and a discharge section. The preheating section is in a flat shape, located on the middle portion of the die cavity, extends to the two sides of the die cavity and communicates with a feed port. The preheating section and the feed port form a T shape. Flow blocking sticks are obliquelyarranged on the end face of the upper die and extend to the exterior of the portion, on the material extrusion section, of the cavity. Coarse tuning sticks are arranged on the end face of the lower die and extend to the exterior of the portion, on the discharge section, of the cavity. Fine tuning sticks are obliquely arranged on the end face of the upper die and extend to a discharge port. By means of extrusion forming of the die head, the barrier film of the required thickness can be directly produced, the fussy sheet casting and stretching process is reduced, and the production efficiency is greatly improved; and the barrier film forming precision is high, and the rejection rate is low.

Description

technical field [0001] The invention belongs to the technical field of extrusion molding dies, in particular to a forming die head of a battery barrier film. Background technique [0002] The barrier film is located between the positive and negative electrodes, and its main function is to separate the active materials of the positive and negative electrodes to prevent the short circuit of the two electrodes due to contact; in addition, during the electrochemical reaction, it can maintain the necessary electrolyte and form a channel for ion movement. The material of the diaphragm is non-conductive, and different types of batteries use different diaphragms. [0003] However, the existing barrier film production process is relatively complicated, and the main steps include batching, extrusion, casting, longitudinal stretching and transverse stretching to produce the required barrier film. The main reason for the complexity of the process is that in the step of extrusion moldin...

AI Technical Summary

Problems solved by technology

[0003] However, the existing barrier film production process is relatively complicated. The main steps include batching, extrusion, casting, longitudinal stretching and transverse stretching to produce the required barrier film.

The main reason for the complexity of the process is that in the step of extrusion molding, the structure and precision of the mold cannot meet the requirements, and it is impossible to directly extrude a thin barrier film

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