Abstract: An electric connection box according to the present invention can include a circuit board having a first surface capable of mounting an electronic component, and a second surface defining a non-mounting surface, a case housing the circuit board, the circuit board oriented in a substantially vertical direction, a vertical inner wall surface of the case formed opposite the non-mounting surface of said circuit board, the vertical inner wall and the non-mounting surface of said circuit board defining a substantially vertical air ventilation path, a suction port positioned in the case and in communication with the ventilation path, an exhaust port positioned in the case above said suction port and in communication with the ventilation path, and a heat generating component in communication with the ventilation path.

Abstract: It is an object to effectively reduce minute clearances generated between a heat radiating member and a vehicle body and ensure good cooling performance while avoiding the occurrence of impact and noise caused by the vibration of a vehicle. A circuit unit U is mounted such that an outer surface 11B of the heat radiating member 10 to which the circuit body 30 is fixed faces a body surface S of the vehicle with a clearance. Preferably, the mounting part 12 fixed to the body of the vehicle is extended, the surface 13 of the mounting part 12 which is in contact with the body is positioned to be substantially parallel to the outer surface 11B of the heat radiating member and a step is provided in both surfaces 13, 11B. In a mounted state, the body and the outer surface 11B of the heat radiating member are facing each other in a substantially parallel state and a clearance is formed between the body and the outer surface of the heat radiating member over the entire area excluding the mounting part 12.

Abstract: There is provided a circuit structure in which a control circuit is formed on the upper surface of an insulating plate 14 by control busbars 15, and a power circuit is formed on the lower surface of the insulating plate 14 by power busbars 18. By this configuration, the circuit structure can be made small in size as compared with the case where the control circuit and the power circuit are formed on separate circuit boards. Also, the insulating plate 14 is formed with an opening 23, and a power busbar 18 is positioned over the opening 23. In the opening 23, a terminal 25B of a relay 16 is positioned, and is connected to the power busbar 18. Thereby, the connecting work process can be simplified as compared with the case where the power circuit and the terminal 25B of the relay 16 are connected to each other, for example, by a jumper wire.

Abstract: An electric connection box according to one aspect of the present invention can include conductive members on a circuit board, a case accommodating the circuit board, a ventilation path formed in the case and through which air can flow in a vertical direction, a suction port formed in the case to be in communication with the ventilation path, an exhaust port formed in the case to be in communication with the ventilation path, the exhaust port positioned above the suction port, cooled portions positioned on the conductive members and positioned in the ventilation path so as to allow air to flow in the vertical direction between conductive members, and heat generating components connected to the cooled portions of the conductive members.

Abstract: One aspect of the present invention can include an electric connection box having a circuit board, a case inside of which said circuit board is housed, a plurality of fitting depressions capable of being fitted with an external electrical component, positioned on a side wall of the case opposing a board surface of the circuit board. Further, an air path inside of said case is defined by the plurality of fitting depressions positioned as an arrayed side by side with a spacing in between, and the air path circulates the air up and down between the plurality of fitting depressions, and an inlet positioned in the case and in communication with the air path, an exhaust outlet is positioned in the case in communication with the air path and positioned above said inlet, and a heat generating component is positioned in the air path.

Abstract: There is provided a circuit structure in which a control circuit is formed on the upper surface of an insulating plate 14 by control busbars 15, and a power circuit is formed on the lower surface of the insulating plate 14 by power busbars 18. By this configuration, the circuit structure can be made small in size as compared with the case where the control circuit and the power circuit are formed on separate circuit boards. Also, the insulating plate 14 is formed with an opening 23, and a power busbar 18 is positioned over the opening 23. In the opening 23, a terminal 25B of a relay 16 is positioned, and is connected to the power busbar 18. Thereby, the connecting work process can be simplified as compared with the case where the power circuit and the terminal 25B of the relay 16 are connected to each other, for example, by a jumper wire.

Abstract: An electric connection box according to the present invention can include a circuit board having a first surface capable of mounting an electronic component, and a second surface defining a non-mounting surface, a case vertically housing the circuit board, an air ventilation path extending between the non-mounting surface of the circuit board and an inner wall surface of the case by opposing the non-mounting surface of the circuit board to the inner wall surface in the case, a suction port positioned in the case and in communication with the ventilation path, an exhaust port positioned in the case above said suction port and in communication with the ventilation path, and a heat generating component in communication with the ventilation path.

Abstract: One aspect of the present invention can include an electric connection box having a circuit board, a case inside of which said circuit board is housed, a plurality of fitting depressions capable of being fitted with an external electrical component, positioned on a side wall of the case opposing a board surface of the circuit board. Further, an air path inside of said case is defined by the plurality of fitting depressions positioned as an arrayed side by side with a spacing in between, and the air path circulates the air up and down between the plurality of fitting depressions, and an inlet positioned in the case and in communication with the air path, an exhaust outlet is positioned in the case in communication with the air path and positioned above said inlet, and a heat generating component is positioned in the air path.

Abstract: An electric connection box according to one aspect of the present invention can include conductive members on a circuit board, a case accommodating the circuit board, a ventilation path formed in the case and through which air can flow in a vertical direction, a suction port formed in the case to be in communication with the ventilation path, an exhaust port formed in the case to be in communication with the ventilation path, the exhaust port positioned above the suction port, cooled portions positioned on the conductive members and positioned in the ventilation path so as to allow air to flow in the vertical direction between conductive members, and heat generating components connected to the cooled portions of the conductive members.