High voltage electric line cutter device

Patent metadata

Field	Value
Publication number	US-11081303-B2
Application number	US-202016814950-A
Country	US
Kind code	B2
Filing date	Mar 10, 2020
Priority date	Oct 11, 2017
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

An electric line cutter device for high voltage busbars has a two-part housing, a piston, an igniter and a busbar. The upper housing includes a cylinder, cuboid or prism chamber. The lower housing also includes a cylinder, cuboid or prism chamber. The piston is contained inside one of either the upper housing chamber or the lower housing chamber. Upon igniting the igniter, the piston breaks a portion of the busbar moving the piston and the portion of the busbar into the opposite chamber thereby stopping the electric current flow. The piston is at least partially formed as an insulator to prevent electric discharge. The piston design together with chamber design includes integrated “squeeze areas” and “blow channels” for the appearing arc. A channel system outside or from inside the piston allow the pyro gases to push the arc plasma into a filter system to cool down the gases.

First claim

What is claimed is:

1. An electric line cutter device comprising:
a first housing with a first housing chamber;
a second housing with a second housing chamber, the second housing coupled to the first housing;
a piston disposed within the first housing chamber, the piston having an end portion and a side portion;
an igniter for driving the piston from the first housing chamber to the second housing chamber; and
a busbar rigidly held between the first and second housings and spanning across the first and second housing chambers,
wherein, upon activating the igniter, the end portion of the piston impacts and breaks the busbar and moves a broken portion of the busbar into an end position of the second housing chamber, and
wherein the side portion of the piston lies flush against a wall of the second housing chamber to hinder or block an electric arc when the piston is at the end position,
wherein one of the first or second housings define at least one vent passage extending from the first or second housing chamber, respectively, to an area exterior to the one of the first or second housings, and
wherein the side portion of the piston at least partially defines at least one blow out channel to guide a gas generated by the igniter to the at least one vent passage.

2. The electric line cutter device of claim 1 wherein the piston comprises a non-electrically conductive material.

3. The electric line cutter device of claim 1 wherein the first and second housings comprise a non-electrically conductive material.

4. The electric line cutter device of claim 1 wherein the first and second housings are removably coupled to each other by one or more fasteners.

5. The electric line cutter device of claim 4 wherein the busbar is rigidly coupled by a compression force between the first and second housings on two opposed sides of the first and second housings.

6. The electric line cutter device of claim 5 wherein the busbar has two stub ends extending radially outwardly from the first and second housings, each of the stub ends configured to be attached to electrical wiring or cable to complete a circuit.

7. The electric line cutter device of claim 6 wherein the busbar, when broken, remains rigidly coupled at the two opposed sides of the first and second housing at the stub ends of the busbar.

8. The electric line cutter device of claim 1 wherein the busbar defines a pair of fracture locations, each fracture location including a groove defined by a side of the busbar adjacent to the piston, the fracture locations being configured to break upon an impact from the piston.

9. The electric line cutter device of claim 1 wherein the igniter is electrically activatable by a signal from an Electronic Control Unit (ECU).

10. The electric line cutter device of claim 1 wherein the electric line cutter device is included in a vehicle capable of generating high voltages.

11. The electric line cutter device of claim 10 wherein the electric line cutter device is activatable by an Airbag Electronic Control Unit in the event of a vehicle crash.

12. The electric line cutter device of claim 1 wherein the igniter is a pyrotechnic device and further comprises a propellant charged squib.

13. The electric line cutter device of claim 1 further comprising at least one filter in the at least one vent passage.

14. The electric line cutter device of claim 13 wherein the at least one filter comprises a high temperature resistant material.

15. The electric line cutter device of claim 13 wherein the at least one filter comprises metal, steel, or woven steel.

16. The electric line cutter device of claim 1 wherein the at least one blow out channel is defined between the piston and the first housing prior to activating the igniter.

Assignees

• Key Safety Systems Inc

Inventors

• Volkmann Matthias
• Pieruch Martin
• Struss Heiko
• Mauthofer Alois

Classifications

• B23D15/145 Primary

  actuated by explosion · CPC title

• B60L3/04

  Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H) · CPC title

• H01H9/342

  Venting arrangements for arc chutes · CPC title

• H01H2039/008

  using the switch for a battery cutoff · CPC title

• B23D15/14

  actuated by fluid or gas pressure · CPC title