Power electronic capacitor for low-inductance light caseless vehicle

Abstract

Provided is a power electronic capacitor for a low-inductance light caseless vehicle. The capacitor comprises a first multi-terminal electrode assembly (1), a second multi-terminal electrode assembly (4), a soft polyester material envelope (2) and a capacitor rolling core (3) fixed in the soft polyester material envelope (2). The capacitor is characterized in that the first multi-terminal electrode assembly (1) and the second multi-terminal electrode assembly (4) are provided with filler circulation holes (17) respectively; the capacitor also comprises a first connection gold spraying layer part (8), a second connection gold spraying layer part (11), a first electrode leading-out end (6), a second electrode leading-out end (9), a first middle conductive belt (7) and a second middle conductive belt (10); the second middle conductive belt (10) is arranged on the outer side of the capacitor rolling core (3); and an insulation layer (5) is arranged between the second middle conductive belt (11) and the capacitor rolling core (3). In this way, self-inductance of the capacitor is reduced, heat dissipation of the capacitor is facilitated, reliability of the capacitor is improved and cost is reduced.

Description

technical field [0001] The invention relates to a power electronic capacitor for vehicles, in particular to the structure of a low-inductance, light-weight and caseless power electronic capacitor for vehicles. In the international patent classification table, the classification can belong to H01G4 / 224 and H01G4 / 228. Background technique [0002] At present, electric vehicles on the market generally use vehicle power electronic capacitors in accordance with GB / T25121-2010 "Rail Transit Locomotive and Rolling Stock Equipment Power Electronic Capacitors". Its capacitor winding core adopts non-inductive winding, and the self-inductance of each winding core is extremely small, so the self-inductance of the capacitor mainly depends on the self-inductance of the electrodes. The electrodes of this capacitor are traditionally drawn out using copper braids or copper strips, and since the capacitor has only two poles, only two copper strips (or copper braided strips) are drawn out as e...

AI Technical Summary

Problems solved by technology

Using such a packaging method, due to the high density of the hard resin and the plastic casing, the volume and weight of the capacitor itself will become larger, which is unfavorable for the electric vehicle for the purpose of carrying people and objects

Moreover, under the conditions of high temperature and severe vibration, the capacitor is prone to cracking and separation between the plastic shell and the hard resin material encapsulation layer, and the hard resin material encapsulation layer and the capacitor core.

In addition, the thermal conductivity of the plastic shell is also poor, and the shell will slow down the heat dissipation of the capacitor itself, causing the internal temperature of the capacitor to rise too fast and too high, further affecting the service life of the capacitor

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