Insulating adhesive film for laminated bus bar and laminated bus bar

Abstract

The invention relates to an insulating adhesive film for a laminated bus bar. The insulating adhesive film comprises an insulating film layer, and a hardened or semi-hardened adhesion agent layer which coats on the insulating film layer, wherein the thickness of the insulating film layer is 0.025-0.50mm; the thickness of the adhesion agent layer is 0.010-0.1mm; the formula of the adhesion agent layer comprises the following raw materials by weight percent: 20-50% of saturated polyester resin A, 5-30% of saturated polyester resin B, 2-20% of epoxy resin, 1-10% of isocyanate, 20-70% of a fire retardant and 0.05-5% of a dispersing agent; the limiting viscosity of the saturated polyester resin A is 0.2-1.2dl/g; the glass transition temperature Tg is -40 DEG C to 50 DEG C; the limiting viscosity of the saturated polyester resin B is 0.2-1.2dl/g; the glass transition temperature Tg is 51 DEG C to 100 DEG C; and the number-average molecular weight of epoxy resin is 500-70,000. The adhesion agent layer of the insulating adhesive film has the characteristics of after-tack resistance, insulativity, good fire resistance and the like, and has the characteristics of high adhesion with a metal plate, excellent bending processability, cold and hot shock resistance and the like after the laminated bus bar is prepared.

Description

technical field [0001] The invention relates to an insulating adhesive film for a laminated busbar and a laminated busbar made of the insulating adhesive film. Background technique [0002] Laminated-Busbar refers to a high-efficiency solution for connecting components or sub-modules of converters or drives. It distributes power from one component to another or from the input side to the output side of a high power module. Widely used in electric locomotives, elevators, large traction machines, wind power and photovoltaic inverters, etc. [0003] Laminated bus bar: Its structure is to stack two or more layers of copper bars together. The layers of the copper plate layer are electrically isolated with insulating materials, and the conductive layer and the insulating layer are pressed into a whole through related processes. Its advantage is that the connecting wire is made into a flat section, which increases the surface area of ​​the conductive layer under the same current ...

AI Technical Summary

Problems solved by technology

[0005] The existing insulating adhesive film mainly has insufficient bonding strength with metal, poor high and low temperature impact resistance, and is not conducive to bending processing (the adhesive layer and the metal plate are prone to delamination during processing, or the substrate cracks)

Insufficient flame retardant performance, not up to VTM-0 (UL-94 standard)

The environmental protection performance is not up to standard and cannot pass ROHS certification

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