# US 2025/0157768 A1 · Electric circuit breaker device

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- Number: US 2025/0157768 A1
- Document ID: US20250157768A1
- Status: Published application
- Kind: A1
- Application number: 18/838,694
- Filed: 2022-09-26
- Published: 2025-05-15
- Earliest claimed: 2022-02-15
- Assignees: Daicel Corporation
- Applicants: Daicel Corporation
- Inventors: Katsuhisa FUJITOU; Ryouta KOUSHIMA
- Web page: https://patentgrep.com/patent/US20250157768A1

## CPC

- H01H 39/006: {Opening by severing a conductor}
- H01H 3/60: Mechanical arrangements for preventing or damping vibration or shock
- H01H 9/302: {wherein arc-extinguishing gas is evolved from stationary parts}
- 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)

## Abstract

An electric circuit breaker device includes: an igniter provided in a housing; a projectile formed in the housing and disposed in an accommodating space extending in one direction; a conductor piece provided in the housing and forming a part of an electric circuit, the conductor piece having a cutoff portion; and an impact absorbing member disposed in an arc-extinguishing region of the accommodating space, the arc-extinguishing region being located on a side opposite to the projectile across the cutoff portion prior to actuation of the igniter and being configured to receive the cutoff portion cut off by the projectile, the impact absorbing member being formed from a resin material that is modified by heat accompanying actuation of the igniter, the impact absorbing member having flexibility, and being configured to absorb an impact in a case where the cutoff portion having been cut off collides.

## Claims

### Claim 1

An electric circuit breaker device comprising:
an igniter provided in a housing;
a projectile formed in the housing and disposed in an accommodating space extending in one direction, the projectile configured to be projected along the accommodating space by energy received from the igniter,
a conductor piece provided in the housing and forming a part of an electric circuit, the conductor piece having, as a part of the conductor piece, a cutoff portion configured to be cut off by the projectile moving due to energy received from the igniter, the cutoff portion being disposed crossing the accommodating space; and
an impact absorbing member disposed in an arc-extinguishing region of the accommodating space, the arc-extinguishing region being located on a side opposite to the projectile across the cutoff portion prior to actuation of the igniter and being configured to receive the cutoff portion cut off by the projectile, the impact absorbing member being formed from a resin material that is modified by heat accompanying actuation of the igniter, the impact absorbing member having flexibility, and being configured to absorb impact in a case where the cutoff portion having been cut off collides.

### Claim 2 (depends on 1)

The electric circuit breaker device according to claim 1, further comprising a coolant material disposed in the accommodating space.

### Claim 3 (depends on 2)

The electric circuit breaker device according to claim 2, wherein the impact absorbing member is disposed inside the coolant material.

### Claim 4 (depends on 2)

The electric circuit breaker device according to claim 2, wherein the impact absorbing member is disposed between the housing defining the arc-extinguishing region and the coolant material.

### Claim 5 (depends on 1)

The electric circuit breaker device according to claim 1, wherein the impact absorbing member is disposed in a ring shape or an arc shape along an inner wall surface of the housing.

### Claim 6 (depends on 1)

The electric circuit breaker device according to claim 1, wherein the impact absorbing member is a synthetic resin containing silicone.

### Claim 7 (depends on 2)

The electric circuit breaker device according to claim 2, wherein the impact absorbing member is disposed in a ring shape or an arc shape along an inner wall surface of the housing.

### Claim 8 (depends on 3)

The electric circuit breaker device according to claim 3, wherein the impact absorbing member is disposed in a ring shape or an arc shape along an inner wall surface of the housing.

### Claim 9 (depends on 4)

The electric circuit breaker device according to claim 4, wherein the impact absorbing member is disposed in a ring shape or an arc shape along an inner wall surface of the housing.

### Claim 10 (depends on 2)

The electric circuit breaker device according to claim 2, wherein the impact absorbing member is a synthetic resin containing silicone.

### Claim 11 (depends on 3)

The electric circuit breaker device according to claim 3, wherein the impact absorbing member is a synthetic resin containing silicone.

### Claim 12 (depends on 4)

The electric circuit breaker device according to claim 4, wherein the impact absorbing member is a synthetic resin containing silicone.