Junction box to be mounted on motor vehicle

Abstract

The present invention relates to a junction box to be mounted on motor vehicle. The junction box has a casing assembly including an upper casing and a lower casing, a laminated unit including bus bars and insulation plates, and first and second printed circuit boards contained in the casing assembly. The first printed circuit board is used as a higher current circuit having thick-film conductors. The second printed circuit board is used as a middle or lower current circuit having thin-film conductors with thicknesses smaller than those of the thick-film conductors on the first printed circuit board. Board relays are mounted on a part of different peripheral portions on both sides of the first printed circuit board or a part of peripheral portion of either side of the first printed circuit board. The board relays are disposed in the casing assembly to be opposed to a first heat generating element containing space defined between a front side of the first printed circuit board and an inner surface of a top wall of the upper casing, and a second heat generating element containing space defined between a rear side of the first printed circuit board and an inner surface of a bottom wall of the lower casing.

Description

technical field [0001] The present application relates to a junction box to be mounted on a motor vehicle, and more particularly to a junction box which improves the connection position of a plurality of high-current relays which are large in size and are heating elements, thereby reducing wiring box size and take measures against heat generation. Background technique [0002] In connection with the rapid increase in the number of electrical and electronic components to be installed on motor vehicles, it may be required that a junction box mounted on a motor vehicle accommodate multiple printed circuit boards housing electrical and electronic components, as well as higher current relays together with Conventional common laminated unit for busbars and insulation boards. In particular, the higher-current relay, which is a heat-generating component, is inserted and connected to a relay accommodating area provided on the outside of the upper case or the lower case, in considera...

AI Technical Summary

Problems solved by technology

Since the thickness of the wires must be consistent on a single PCB, circuits with higher currents will require larger areas of wires, which prevents small board size reductions

[0009] Also, if a high-current relay having a large heat generation is housed in the case assembly as a board relay, since an internal circuit such as a bus bar, a printed circuit board, or the like is housed in the case assembly, and since it is thermally relatively weak The electrical and electronic components are mounted on the printed circuit board, so there is a problem that the internal circuit will be easily affected by the heat from the board relay

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