# US 7,745,745 B2 · Housing for a pyromechanical disconnecting device with integrated ignition element

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- Number: US 7,745,745 B2
- Document ID: US7745745B2
- Status: Granted
- Kind: B2
- Application number: 10/835,065
- Filed: 2004-04-30
- Published: 2005-02-17
- Granted: 2010-06-29
- Earliest claimed: 2003-04-30
- Assignees: Delphi Technologies, Inc.
- Inventors: Gerhard Kordel; Jurgen Knauss
- Web page: https://patentgrep.com/patent/US7745745B2

## CPC

- H01H 39/00: Switching devices actuated by an explosion produced within the device and initiated by an electric current
- B23D 15/145: {actuated by explosion}
- B23D 29/002: {for cutting wire or the like}
- F42B 3/006: {Explosive bolts; Explosive actuators (explosive valves F16K13/06; explosive cutting B23D15/145; explosive switches H01H39/00; pyrotechnical actuators F15B15/19)}
- H01H 2039/008: {using the switch for a battery cutoff}
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)
- B23D: PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR (making toothed gears or the like B23F; cutting metal by applying heat locally B23K; arrangements for copying or controlling B23Q)
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)

## Abstract

A pyromechanical disconnecting device, in particular for battery shutoff in a motor vehicle include a housing (1) in which there is arranged a conductor bus (11) that is designed to be severable by a cutting chisel (12) at a predetermined cut point, the cutting chisel being capable of being accelerated by the propellant gases of an ignition element (2). In order to facilitate assembly it is proposed that the housing (1) be extruded around the ignition element (2), which in this way forms one structural unit with the housing (1).

## Claims

### Claim 1

A pyromechanical disconnecting device comprising a housing in which there is arranged a conductor bus that is designed to be severable by a cutting chisel at a predetermined cut point, the cutting chisel being capable of being accelerated by the propellant gases of an ignition element, characterized in that the housing is extruded around the ignition element, which in this way forms one structural unit with the housing.

### Claim 2 (depends on 1)

The pyromechanical disconnecting device according to claim 1, characterized in that the housing is made of an electrically insulating material.

### Claim 3 (depends on 2)

The pyromechanical disconnecting device according to claim 2, characterized in that strength-enhancing fillers such as glass fibers or carbon fibers are arranged in the insulating material.

### Claim 4 (depends on 1)

The pyromechanical disconnecting device according to claim 1, characterized in that the housing is made of a plastic.

### Claim 5 (depends on 1)

The pyromechanical disconnecting device according to claim 1, characterized in that the housing is not extruded around connecting pins of the ignition element for electrical contacting and said pins are arranged in a recess of the housing.

### Claim 6 (depends on 5)

The pyromechanical disconnecting device according to claim 5, characterized in that the connecting pins of the ignition element are insulated from one another.

### Claim 7 (depends on 1)

The pyromechanical disconnecting device according to claim 1, characterized in that an interior of the housing has a peripheral recess in the region of the ignition element for attaching the cutting chisel.

### Claim 8 (depends on 7)

The pyromechanical disconnecting device according to claim 7, characterized in that there is arranged in the peripheral recess, one the side facing toward the ignition element, a peripheral groove in which a seal ring is accommodated.

### Claim 9

A battery shut off in a motor vehicle comprising a housing in which there is arranged a conductor bus that is designed to be severable by a cutting chisel at a predetermined cut point, the cutting chisel being capable of being accelerated by the propellant gases of an ignition element, characterized in that the housing is extruded around the ignition element, which in this way forms one structural unit with the housing.