Capacitor for connecting IGBTs in parallel and manufacturing process and application method thereof

Abstract

The invention provides a capacitor for connecting IGBTs in parallel and a manufacturing process and an application method thereof. The capacitor comprises a core injection molding assembly, a negativeelectrode copper bar, a positive electrode copper bar and a shell, wherein the core injection molding assembly includes an injection molding body and a plurality of capacitor film cores which are arranged in an array and penetrate through the injection molding body; the positive electrode copper bar and the negative electrode copper bar are not contacted; and the shell is formed by injection molding after the positive electrode copper bar and the negative electrode copper bar are connected to the core injection molding assembly. The manufacturing process comprises the steps of arranging a plurality of capacitor film cores in an array and then carrying out low-pressure injection molding to form an integrated core injection molding assembly; acquiring a positive electrode copper bar and a negative electrode copper bar by adopting stamping molding; welding the positive electrode copper bar and the negative electrode copper bar to the core injection molding assembly; placing the welded core injection molding assembly, the positive electrode copper bar and the negative electrode copper bar into an injection molding mold for fine positioning, and performing high-pressure injection molding; and compounding the positive and negative copper bars, the capacitor core and the plastic shell into a whole through the integrated injection molding process. The capacitor has the advantages of good shock resistance, good heat conductivity and small volume and mass.

Description

technical field [0001] The invention relates to the technical field of control of new energy vehicles, in particular to a capacitor used for parallel connection of IGBTs. Background technique [0002] At present, in the motor drive system of the drive motor of new energy vehicles, the inverter (power electronic controller PEU) is used to control and adjust the speed of the drive motor. Electricity, as the current input to drive the motor. [0003] The inverter is mainly composed of DC input components, DC input filters, DC bus capacitors, power modules, AC output components, control modules, coolers, etc. Among them, the DC bus capacitor is the core component of the inverter. At present, most of the busbar capacitors used in new energy vehicle inverters use film capacitors. [0004] The general process of the current film capacitor manufacturing process is as follows: the positive and negative terminal copper bars of the capacitor are stamped first, and then welded with t...

AI Technical Summary

Problems solved by technology

[0006] When IGBT modules are used in parallel, unreasonable design of drive and DC bus capacitors, etc., may cause heavy or light current unevenness between modules

Seriously, it will lead to a single module current overload, which will cause shutdown

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