# US 12,184,046 B2 · Electrical junction box > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,046 B2 - Document ID: US12184046B2 - Status: Granted - Kind: B2 - Application number: 18/264,780 - Filed: 2022-01-26 - Published: 2024-03-28 - Granted: 2024-12-31 - Earliest claimed: 2021-02-12 - Assignees: Sumitomo Wiring Systems, Ltd. - Applicants: Sumitomo Wiring Systems, Ltd. - Inventors: Yuya Yoshimura - Web page: https://patentgrep.com/patent/US12184046B2 ## CPC - B60R 16/02: electric {constitutive elements} - H02B 1/56: Cooling; Ventilation - B60R 16/0238: {Electrical distribution centers} - B60R 16/0239: {Electronic boxes} - H02B 1/20: Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards (installations of bus-bars H02G5/00) - H02B 1/48: Mounting of devices therein - H02G 3/16: structurally associated with support for line-connecting terminals within the box - H05K 7/06: on insulating boards {, e.g. wiring harnesses (for printed circuits H05K1/18, H05K3/30)} - H05K 7/20: Modifications to facilitate cooling, ventilating, or heating - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - H02B: BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract An electrical junction box includes: a case that is insulative; a relay that is attached to the case; a busbar that is connected to a terminal of the relay; and a first heat dissipation member that is connected to the relay so as to be able to transfer heat. The case includes a first case member and a second case member that is coupled to the first case member and that provides a housing space between the first case member and the second case member, the first heat dissipation member includes a first layer portion that is stacked on the first case member within the housing space, and the busbar includes a second layer portion that is stacked on the first case member and the first layer portion outside the case. ## Claims ### Claim 1 An electrical junction box comprising: a case; a relay that is attached to the case; a busbar that is connected to a terminal of the relay; and a first heat dissipation member that is connected to the relay so as to be able to transfer heat, wherein the case includes a first case member and a second case member that is coupled to the first case member and that provides a housing space between the first case member and the second case member, the first heat dissipation member includes a first layer portion that is stacked on the first case member within the housing space, and the busbar includes a second layer portion that is stacked on the first case member and the first layer portion outside the case. ### Claim 2 (depends on 1) The electrical junction box according to claim 1, further comprising: a second heat dissipation member that is provided within the housing space between the first layer portion and the second case member, and is stacked on the first layer portion and the second case member. ### Claim 3 (depends on 2) The electrical junction box according to claim 2, wherein the first heat dissipation member is made of metal, and the second heat dissipation member is made of synthetic resin. ### Claim 4 (depends on 3) The electrical junction box according to claim 3, wherein the first case member or the second case member is provided with a ridge that is resistant to bending deformation. ### Claim 5 (depends on 3) The electrical junction box according to claim 3, wherein the first heat dissipation member is connected to the terminal of the relay. ### Claim 6 (depends on 2) The electrical junction box according to claim 2, wherein the first case member or the second case member is provided with a ridge that is resistant to bending deformation. ### Claim 7 (depends on 6) The electrical junction box according to claim 6, wherein the ridge is formed on a surface that is on the first layer portion-side, of the first case member. ### Claim 8 (depends on 7) The electrical junction box according to claim 7, wherein the case is provided with a protruding portion that protrudes in a second direction that is orthogonal to a first direction in which the first layer portion and the second layer portion are stacked, and the first layer portion of the first heat dissipation member and the second heat dissipation member are provided on the protruding portion, and the ridge extends in the second direction. ### Claim 9 (depends on 7) The electrical junction box according to claim 7, wherein the first heat dissipation member is connected to the terminal of the relay. ### Claim 10 (depends on 6) The electrical junction box according to claim 6, wherein the case is provided with a protruding portion that protrudes in a second direction that is orthogonal to a first direction in which the first layer portion and the second layer portion are stacked, and the first layer portion of the first heat dissipation member and the second heat dissipation member are provided on the protruding portion, and the ridge extends in the second direction. ### Claim 11 (depends on 10) The electrical junction box according to claim 10, wherein the first heat dissipation member is connected to the terminal of the relay. ### Claim 12 (depends on 6) The electrical junction box according to claim 6, wherein the first heat dissipation member is connected to the terminal of the relay. ### Claim 13 (depends on 2) The electrical junction box according to claim 2, wherein the first heat dissipation member is connected to the terminal of the relay. ### Claim 14 (depends on 1) The electrical junction box according to claim 1, wherein the first heat dissipation member is connected to the terminal of the relay. ### Claim 15 (depends on 14) The electrical junction box according to claim 14, wherein the first heat dissipation member and the busbar overlap each other at a position of the terminal of the relay.