Polyimide film cold-pressed composite busbar for automobile capacitor and preparation method of polyimide film cold-pressed composite busbar

Abstract

The invention provides a polyimide film cold-pressed composite busbar for an automobile capacitor and a preparation method of the polyimide film cold-pressed composite busbar. The composite busbar comprises an upper busbar unit and a lower busbar unit, wherein the upper busbar unit comprises an L-shaped upper busbar and an upper busbar insulating film, the L-shaped upper busbar comprises an upper busbar vertical plate and an upper busbar horizontal plate, the upper busbar insulating film is attached to the inner side of the upper busbar vertical plate; the lower busbar unit comprises an L-shaped lower busbar and a lower busbar insulating film, the L-shaped lower busbar comprises a lower busbar vertical plate and a lower busbar horizontal plate, the lower busbar vertical plate comprises a lower busbar positioning plate and a connecting plate which are located on the upper side, and the lower busbar insulating film is attached to the inner side of the lower busbar positioning plate; and the upper busbar insulating film and the lower busbar insulating film are both made of polyimide. The composite busbar provided by the invention solves the problems of insufficient high-temperature-resistant grade, insufficient high-voltage-resistant grade, insufficient wear resistance, early failure and the like in the prior art.

Description

technical field [0001] The invention belongs to an electrical connection part between power modules, in particular to a polyimide film cold-pressed composite busbar for automobile capacitors and a preparation method thereof. Background technique [0002] Composite busbars, also known as laminated busbars, generally include conductive layers, insulating layers, and necessary positioning and bonding parts. It is a multi-layer composite structure. The connection bar uses a composite busbar, which can reduce the parasitic inductance of the circuit, protect switching devices (such as IGBT) from reverse voltage breakdown, and reduce EMI electromagnetic interference in the circuit. At the same time, it can improve system heat dissipation and assembly connections. It is widely used in the field of power conversion. [0003] In the material design and selection of traditional composite busbars, the conductive layer is generally made of copper (such as T2) or aluminum alloy (such as ...

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Problems solved by technology

[0003] In the material design and selection of traditional composite busbars, the conductive layer is generally made of copper (such as T2) or aluminum alloy (such as 1060), and the insulating layer is generally made of polyester film (such as PET) or Nomex paper (NOMEX). The material is generally made of acrylic hot melt adhesive, and the price of the material is relatively low, but in some fields, there are problems such as insufficient high temperature resistance, insufficient high pressure resistance, insufficient wear resistance, etc., especially in the application of electric vehicles, there is a risk of early failure

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