# US 2025/0096541 A1 · Electrical junction box

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- Number: US 2025/0096541 A1
- Document ID: US20250096541A1
- Status: Published application
- Kind: A1
- Application number: 18/570,148
- Filed: 2022-06-01
- Published: 2025-03-20
- Earliest claimed: 2021-06-18
- Assignees: Autonetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd.
- Applicants: AutoNetworks Technologies, Ltd.; Sumitomo Wiring Systems, Ltd.; Sumitomo Electric Industries, Ltd.
- Inventors: Tatsuya DAIDOJI; Arinobu NAKAMURA; Heng CAO
- Web page: https://patentgrep.com/patent/US20250096541A1

## CPC

- H02G 3/088: {Dustproof, splashproof, drip-proof, waterproof, or flameproof casings or inlets}
- B60R 16/02: electric {constitutive elements}
- H02G 3/16: structurally associated with support for line-connecting terminals within the box
- H05K 5/02: Details
- H05K 7/06: on insulating boards {, e.g. wiring harnesses (for printed circuits H05K1/18, H05K3/30)}
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

An electrical junction box includes a busbar, a molded resin portion that is insert-molded using the busbar as an insert component, a case that covers the molded resin portion to form a waterproof space, a blocking portion that blocks a first opening of a through hole passing through the molded resin portion, and a waterproofing resin that is filled in the through hole. The through hole is formed between the first holding portion and the second holding portion and the entire periphery of an intermediate portion of the busbar is exposed in the through hole. The blocking portion is a member that is provided separately from the molded resin portion. The waterproofing resin reaches the blocking portion while entirely covering the periphery of the intermediate portion of the busbar.

## Claims

### Claim 1

An electrical junction box comprising:
a busbar;
a molded resin portion that is insert-molded using the busbar as an insert component;
a case that covers the molded resin portion to form a waterproof space;
a blocking portion that blocks a first opening out of a first opening and a second opening of a through hole passing through the molded resin portion; and
a waterproofing resin that is filled in the through hole,
wherein the molded resin portion includes a first holding portion that holds one end portion of the busbar, and a second holding portion that holds the busbar with the other end portion of the busbar being exposed in the waterproof space,
the through hole is formed between the first holding portion and the second holding portion and an entire periphery of an intermediate portion of the busbar is exposed in the through hole,
the blocking portion is a member that is provided separately from the molded resin portion, and
the waterproofing resin reaches the blocking portion while entirely covering the periphery of the intermediate portion of the busbar.

### Claim 2 (depends on 1)

The electrical junction box according to claim 1, wherein the blocking portion is formed in one piece with the case.

### Claim 3 (depends on 1)

The electrical junction box according to claim 1, wherein the blocking portion is welded to a peripheral edge portion of the through hole in the molded resin portion.

### Claim 4 (depends on 1)

The electrical junction box according to claim 1, wherein one of the blocking portion and a peripheral edge portion of the through hole in the molded resin portion is provided with an annular groove and the other is provided with an annular protrusion fitted to the groove.

### Claim 5 (depends on 1)

The electrical junction box according to claim 1, wherein a portion of the blocking portion that serves as a bottom of the through hole enters the through hole.

### Claim 6 (depends on 2)

The electrical junction box according to claim 2, wherein the blocking portion is welded to a peripheral edge portion of the through hole in the molded resin portion.

### Claim 7 (depends on 2)

The electrical junction box according to claim 2, wherein one of the blocking portion and a peripheral edge portion of the through hole in the molded resin portion is provided with an annular groove and the other is provided with an annular protrusion fitted to the groove.

### Claim 8 (depends on 3)

The electrical junction box according to claim 3, wherein one of the blocking portion and a peripheral edge portion of the through hole in the molded resin portion is provided with an annular groove and the other is provided with an annular protrusion fitted to the groove.

### Claim 9 (depends on 2)

The electrical junction box according to claim 2, wherein a portion of the blocking portion that serves as a bottom of the through hole enters the through hole.

### Claim 10 (depends on 3)

The electrical junction box according to claim 3, wherein a portion of the blocking portion that serves as a bottom of the through hole enters the through hole.

### Claim 11 (depends on 4)

The electrical junction box according to claim 4, wherein a portion of the blocking portion that serves as a bottom of the through hole enters the through hole.