EP-4738417-A1 - INTERRUPTER, POWER DISTRIBUTION DEVICE, AND VEHICLE

EP4738417A1EP 4738417 A1EP4738417 A1EP 4738417A1EP-4738417-A1

Abstract

An interrupter, a power distribution device, and a vehicle are provided, and relate to the field of interrupter technologies. The interrupter includes: a base having an arc chute; a sealing cover, disposed on one side of an opening of the arc chute, where the sealing cover has a first channel that passes through a thickness direction of the sealing cover, and the first channel communicates with the opening of the arc chute; a current-carrying copper busbar, where the current-carrying copper busbar is disposed in parallel with the sealing cover, the current-carrying copper busbar passes through the sealing cover in a direction perpendicular to the thickness direction of the sealing cover, a sealed structure in which a boss and a clamping slot are matched is formed between the sealing cover and the current-carrying copper busbar, a part that is of the current-carrying copper busbar and that is located in the first channel includes a thinned part, and a thickness of the thinned part is less than a thickness of another part of the current-carrying copper busbar; and a piston, where the piston is at least partially accommodated in the first channel, and a projection of the piston in the thickness direction of the sealing cover at least partially overlaps with the thinned part. In the interrupter provided in this application, the sealed structure in which the boss and the clamping slot are matched is formed between the sealing cover and the current-carrying copper busbar, so that gas tightness of the interrupter can be improved.

Inventors

ZHOU, XUDONG
RAN, XIAOKE
GONG, Yawen
Zhao, Fugao
ZHANG, Xiufeng
CHEN, Taixian
LIU, Yanbo
HUANG, JIAJUN

Assignees

Huawei Digital Power Technologies Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20251030

Claims (15)

An interrupter, comprising: a base having an arc chute; a sealing cover, disposed on one side of an opening of the arc chute, wherein the sealing cover has a first channel that passes through a thickness direction of the sealing cover, and the first channel communicates with the opening of the arc chute; a current-carrying busbar, wherein the current-carrying busbar is disposed in parallel with the sealing cover, the current-carrying busbar passes through the sealing cover in a direction perpendicular to the thickness direction of the sealing cover, a sealed structure in which a boss and a clamping slot are matched is formed between the sealing cover and the current-carrying busbar, a part that is of the current-carrying busbar and that is located in the first channel comprises a thinned part, and a thickness of the thinned part is less than a thickness of another part of the current-carrying busbar; and a piston, wherein the piston is at least partially accommodated in the first channel, and a projection of the piston in the thickness direction of the sealing cover at least partially overlaps with the thinned part.
The interrupter according to claim 1, wherein the clamping slot is located on a side that is of the current-carrying busbar and that faces away from the base, and the boss is disposed on the sealing cover and extends into the clamping slot from the side that is of the current-carrying busbar and that faces away from the base.
The interrupter according to claim 1 or 2, wherein the boss comprises a first through hole, the first through hole communicates with the first channel, and a projection of the first through hole in the thickness direction of the sealing cover at least partially overlaps with the thinned part.
The interrupter according to claim 3, wherein an edge of the first through hole is fitted against an outer wall surface of the piston.
The interrupter according to any one of claims 1 to 4, wherein the sealing cover comprises a sealing upper cover and a sealing lower cover, the sealing upper cover, the sealing lower cover, and the base are connected in sequence, an accommodation groove is disposed between the sealing upper cover and the sealing lower cover, and the accommodation groove is configured to enclose the current-carrying busbar.
The interrupter according to claim 5, wherein the sealing upper cover is provided with a first raised rib, and the sealing lower cover is provided with a first groove; and/or the sealing lower cover is provided with a first raised rib, and the sealing upper cover is provided with a first groove; and the first raised rib is inserted into the first groove, and the first raised rib is located on two sides of the current-carrying busbar.
The interrupter according to claim 5 or 6, wherein the sealing upper cover is provided with the first through hole, the sealing lower cover is provided with a second through hole, the first through hole and the second through hole communicate to form a part of the first channel, and on one side or two sides of the current-carrying busbar in a width direction of the current-carrying busbar, there is a spacing between the current-carrying busbar and each of the edge of the first through hole and an edge of the second through hole.
The interrupter according to claim 7, wherein in an extension direction of the current-carrying busbar, a length of a projection overlapping part between the second through hole and the current-carrying busbar in the thickness direction of the sealing cover is greater than a length of a projection overlapping part between the first through hole and the current-carrying busbar in the thickness direction of the sealing cover.
The interrupter according to claim 7 or 8, wherein a bendable groove is disposed on a side that is of the current-carrying busbar and that faces the base, and a projection of the bendable groove completely falls into a projection of the second through hole in the thickness direction of the sealing cover.
The interrupter according to any one of claims 1 to 4, wherein the first channel comprises a first subchannel and a second subchannel, the first subchannel is located on the side that is of the current-carrying busbar and that faces away from the base, and the second subchannel is located on a side that is of the current-carrying busbar and that is close to the base; and in an extension direction of the current-carrying busbar, a length of a projection overlapping part between the second subchannel and the current-carrying busbar in the thickness direction of the sealing cover is greater than a length of a projection overlapping part between the first subchannel and the current-carrying busbar in the thickness direction of the sealing cover.
The interrupter according to any one of claims 1 to 4, wherein on one side or two sides of the current-carrying busbar in a width direction of the current-carrying busbar, there is a spacing between a side wall of the first channel and the current-carrying busbar.
The interrupter according to any one of claims 1 to 11, wherein the interrupter further comprises a top cover, and the top cover is located on a side that is of the sealing cover and that faces away from the base; the sealing cover is provided with a second raised rib, and the top cover is provided with a second groove; and/or the sealing cover is provided with a second groove, and the top cover is provided with a second raised rib; the second raised rib is disposed around a periphery of an opening edge of the first channel; and the second raised rib is located in the second groove.
The interrupter according to claim 12, wherein there is a third raised rib on the sealing cover, and the base is provided with a third groove; and/or the sealing cover is provided with a third groove, and the base is provided with a third raised rib; the third raised rib is disposed around the periphery of the opening edge of the first channel; and the third raised rib is located in the third groove.
A power distribution device, comprising a connector and the interrupter according to any one of claims 1 to 13, wherein the connector is configured to be electrically connected to a power supply, and the interrupter is electrically connected between the connector and the power supply.
A vehicle, comprising a power supply and the power distribution device according to claim 14, wherein the power supply is electrically connected to the power distribution device, and the interrupter is electrically connected between the connector and the power supply.

Description

TECHNICAL FIELD This application relates to the field of interrupter technologies, and in particular, to an interrupter, a power distribution device, and a vehicle. BACKGROUND An interrupter is an electronic element configured to connect or disconnect a current in one or more circuits. The interrupter can be used in a power system, to protect safe operation of the power system. When the circuit is overloaded or short-circuited or has another fault, the interrupter can automatically switch to a disconnected state to disconnect the current in the circuit, thereby playing a protection role. A piston is disposed in the interrupter. When the current is abnormal, a high-speed movement of the piston is triggered, so that the piston breaks a current-carrying copper busbar to disconnect the circuit. After the current-carrying copper busbar is fractured, an arc and a high-temperature free gas are generated at a fracture part. When the piston breaks the current-carrying copper busbar and enters an arc chute, if gas tightness between the current-carrying copper busbar and the sealing cover is poor, a high-temperature free gas in the arc chute spreads to the current-carrying copper busbar, and free electrons and ions in the gas increase conductivity between current-carrying copper busbars obtained through fracture, thereby reducing insulation performance between the current-carrying copper busbars obtained through fracture. Consequently, voltage breakdown occurs between fracture openings of the current-carrying copper busbars, and finally, the interrupter is damaged or even the entire power system is faulty. SUMMARY This application provides an interrupter, a power distribution device, and a vehicle, to improve gas tightness of the interrupter. According to a first aspect, this application provides an interrupter, including: a base having an arc chute; a sealing cover, disposed on one side of an opening of the arc chute, where the sealing cover has a first channel that passes through a thickness direction of the sealing cover, and the first channel communicates with the opening of the arc chute; a current-carrying copper busbar, where the current-carrying copper busbar is disposed in parallel with the sealing cover, the current-carrying copper busbar passes through the sealing cover in a direction perpendicular to the thickness direction of the sealing cover, a sealed structure in which a boss and a clamping slot are matched is formed between the sealing cover and the current-carrying copper busbar, a part that is of the current-carrying copper busbar and that is located in the first channel includes a thinned part, and a thickness of the thinned part is less than a thickness of another part of the current-carrying copper busbar; and a piston, where the piston is at least partially accommodated in the first channel, and a projection of the piston in the thickness direction of the sealing cover at least partially overlaps with the thinned part. The sealed structure in which the boss and the clamping slot are matched is formed between the sealing cover and the current-carrying copper busbar that are provided in this application. The boss may be located in the clamping slot, so that a first contact surface of the sealing cover can be hermetically fitted against a second contact surface of the current-carrying copper busbar. Through a hermetic connection between the boss and the clamping slot, better sealing between the current-carrying copper busbar and the sealing cover can be implemented. In this application, there is good gas tightness between the current-carrying copper busbar and the sealing cover, so that a high-temperature free gas in the arc chute can be prevented from spreading to the current-carrying copper busbar. Therefore, the interrupter can quickly disconnect a current, to protect safe operation of the power system. In a possible implementation, the clamping slot is located on a side that is of the current-carrying copper busbar and that faces away from the base, and the boss is disposed on the sealing cover and extends into the clamping slot from the side that is of the current-carrying copper busbar and that faces away from the base. The current-carrying copper busbar includes a connecting part and a bendable part. A surface of the bendable part in a negative Z direction and a surface of the connecting part in the negative Z direction are located on a same plane. A part of the bendable part in the first channel is the thinned part, and the thickness of the thinned part is less than a thickness of the connecting part. Therefore, a clamping slot is formed between the thinned part and the connecting part. The clamping slot is located on a side of the thinned part in a positive Z direction, and the boss is located on the sealing cover and extends into the clamping slot in the negative Z direction. Through matching between the boss and the clamping slot, the sealing cover is fastened to the current-carrying cop