tdo edge guide device for lithium battery diaphragm production line

Abstract

The invention belongs to the field of production equipment of lithium battery diaphragms, and particularly relates to a TDO (Transverse Direction Oriented) edge guide device for a production line of a lithium battery diaphragm. The device comprises supporting plates and pressing plates, wherein gaps between plate surfaces of the supporting plates and the pressing plates form channels for allowing the edges of the lithium battery diaphragm to travel; each pressing plate and each supporting plate which are mutually matched serve as an edge guide unit; the two edge guide units are arranged on the two side edges of the lithium battery diaphragm respectively, and arranged near clamping ends of chain clamps of transverse drawing machines behind a guide roll; the pressing plates are fixed at upper housings of the transverse drawing machines by fixing racks; the fixing racks comprise fixed bases and stretching arms; articulated shafts of the stretching arms and the fixed bases are arranged parallel to a travel direction of the lithium battery diaphragm; and limiting tables for limiting articulation motion ranges of the stretching arms are arranged on the fixed bases. After equipment is put into testing, a transverse tensile fracture rate of the diaphragm is reduced linearly; production is stable; the cost waste and the labor intensity of personnel caused by diaphragm fracture are reduced effectively; and an effect is very considerable.

Description

technical field [0001] The invention belongs to the field of lithium battery diaphragm production equipment, and in particular relates to a TDO edge guide device used in a lithium battery diaphragm production line. Background technique [0002] TDO (transverse direction oriented), also known as transverse stretching, is a process in biaxially stretched films; in the field of lithium battery separator production, biaxial stretching is widely used. Two-way stretching method, that is, after the polymer melt leaves the die, it needs to be stretched longitudinally and stretched transversely to meet the process requirements. During the transverse stretching process, chain clamps are needed to effectively clamp the film edges on both sides of the diaphragm. Due to the soft nature of the lithium battery diaphragm, when the diaphragm is clamped by the chain clamp, it is easily curled at the edge of the film due to the influence of external wind force and the design of the clamp. Pe...

AI Technical Summary

Problems solved by technology

Therefore, there is a certain distance between the guide roller and the nip of the chain clip, and the distance is generally at least 8cm. When the diaphragm passes through the guide roller and enters the area before the nip, the film edges on both sides will still curl. , flanging and other phenomena, which in turn lead to tearing and breaking of the diaphragm when it is thermally stretched in the horizontal stretching box

However, there is a narrow triangular area between the guide roller and the closed front part of the chain clip, which cannot accommodate larger auxiliary tools such as edge guides and pressure rollers to achieve continuous film edge flattening, and this narrow triangular area becomes The high-incidence area where the film edge is wrinkled and curled will increase the production cost

How to develop an edge guide part with a simple and reasonable structure to solve the defect that the film edge at the above-mentioned triangular area cannot be effectively smoothed, and ensure the smoothness of the diaphragm entering the nip is a technical problem to be solved urgently by those skilled in the art

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