High-voltage precharging relay of electric car

Abstract

The invention relates to a high-voltage precharging relay of an electric car. The high-voltage precharging relay comprises a relay main body, a relay housing, an arc extinguishing chamber, a right-opened rectangle support, and a pair of magnets, wherein the relay main body and the arc extinguishing chamber are in insertion assembly; the arc extinguishing chamber and the relay housing are designed as a whole; the right-opened rectangle support is clamped between the relay housing and the relay main body, and the right-opened rectangle support and the arc extinguishing chamber form an empty position for mounting the magnets; the pair of magnets are arranged symmetrically in parallel and are pressed and fixed in the empty positions, and the contact point of the relay main body is positioned within the range between the pair of magnets; a direction perpendicular to the pair of magnets is Y-direction, and the direction of an electric arc is Z-direction, and the direction of arc extinguishing acting force is X-direction, and the X-direction, Y-direction and Z-direction are perpendicular with one another in the three-dimension space. The function of arc extinguishment can be realized, and the relay housing and the arc extinguishing chamber are designed as a whole, so that the production is simpler, and the cost has better advantages.

Description

technical field [0001] The invention relates to a high-voltage pre-charging relay for electric vehicles, belonging to the technical field of high-voltage pre-charging relays. Background technique [0002] Pre-charging management is an essential and important link in new energy vehicles. Its main function is to charge the large capacitor of the motor controller (that is, the inverter) to reduce spark arcing when the contactor contacts, reduce impact, and increase safety. sex. The high-voltage pre-charge relay is turned on to energize the capacitor at the beginning of charging, and the time is very short. When the capacitor is charged, the main relay is closed (the pre-charge relay is disconnected at this time), so it is required to bear a certain load for a short time. At the same time Play a protective role on the main relay. [0003] The existing high-voltage relays, due to the high voltage, often generate strong arcs when they are exposed to electric shocks, causing pote...

AI Technical Summary

Problems solved by technology

[0003] The existing high-voltage relays, due to the high voltage, often generate strong arcs when they are exposed to electric shocks, causing potential safety hazards, and the contacts burn a lot, so arc-extinguishing technology must be used, and the arc-extinguishing method of high-voltage relays generally adopts a closed environment Vacuum or filled with high-pressure gas, the design and process assembly are more complicated, and due to the large current and voltage, the product is relatively large, which consumes materials and materials, and the cost is high. If the pre-charge relay is also designed in this way, the cost will be relatively relatively Therefore, considering the working characteristics of pre-charged relays, how to provide a proposed arc extinguishing chamber structure, which can not only achieve the effect of arc extinguishing, but also simplify the manufacturing process and reduce costs, has become an urgent technical problem in this field.

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