JP2002034123A - Conductors for high-voltage electrical junction box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a leakage current between bus-bars to which different voltages are applied in an electrical junction box. SOLUTION: A high-voltage of 42 V is applied to conductors by a power supply. The conductors, to which the high voltage is applied, are made of a metal with Cu as the main component containing Zn and Mg or/and Fe to obtain leakage-resistant properties. The content of Cu is 60-65 wt.%, the content of Zn is 0.1-35 wt.%, the content of Mg is 0.01-1.0 wt.% and the content of Fe is 0.01-1.0 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive material used for a high-voltage electrical junction box mounted on a motor vehicle.

[0002]

2. Description of the Related Art Conventionally, a passenger car of an internal combustion engine generally has one battery with a rated voltage of 12 V and a maximum voltage of 14 V, and a voltage of a maximum of 14 V is supplied from the battery to a circuit such as a bus bar in an electric connection box. The power is distributed by the internal circuit of the electric connection box, and the electric components mounted on the vehicle are controlled and the signals are transmitted and received through the electric wires connected to the internal circuit. In some cases, a rated voltage of 24 V and a maximum voltage of 28 V are applied to the track.

In recent years, the number of electrical components mounted on automobiles has increased rapidly, and the amount of current supplied to one electrical component tends to increase. For example, the power required to drive a fan has conventionally been 130 watts. However, in recent years it has been 260 watts. Further, an intake / exhaust device for an engine requiring a high voltage such as 36 V, an electric power steering, etc. are rated 1
It cannot be operated with a 2V battery power supply, and is therefore operated mechanically by the driving force of the engine.

[0004] As described above, the diameter of the electric wire is increased as the required current amount of the single electric component is increased, and the number of electric wires is increased due to the rapid increase of the electric component. . As a result, the weight of electric wires routed to the vehicle increases. Also, as in the case of the above-mentioned solenoid valve for engine intake and exhaust, the required power is large, so that it cannot be operated with a power supply from a battery, and if it is operated mechanically, fine control of intake and exhaust cannot be performed, and fuel efficiency also deteriorates. As a result, it is not environmentally preferable. Therefore, it is preferable that the intake / exhaust device or the like which has been conventionally operated by a mechanical cam be electrically driven by a power source from a battery as much as possible.

[0005] In view of the above, in a car, a voltage of up to 14 V from a generally mounted battery is used,
By increasing the voltage so that a voltage higher than the voltage can be applied, the required current amount can be reduced, and accordingly, the wire diameter can be reduced and the wire bundle (wire harness) can be reduced, and the wire weight can be reduced. Can be planned. In addition, the above-described suction arrangement device and power steering, which have conventionally been operated mechanically or hydraulically, can be electrically controlled, thereby enabling fine control of the intake and exhaust systems, improving fuel efficiency, and improving the environment. be able to.

[0006]

As described above, it is preferable to apply a high voltage of about 42 V to the electric power steering, the engine intake / exhaust device, the fan, etc., which require a large amount of electric power, while the signal system and relay of the electric parts are preferably applied. In general passenger cars, the coil and the like have the same rated power of 12 V (maximum voltage of 14
V).

Accordingly, a circuit in which a low voltage of a maximum voltage of 14 V is applied to a circuit of an electric junction box for distributing power,
When a circuit to which a high voltage of about V is applied is provided, a leakage current due to a potential difference is likely to occur. In addition, when water infiltration occurs, there is a problem that a leak current easily occurs even between circuits to which a high voltage of 42 V is applied.

Conventionally, as a material for forming a terminal such as a bus bar or a relay terminal constituting an internal circuit of an electric junction box, a second-class copper alloy (60% by weight of copper, 40% by weight of zinc) is used for the bus bar. First class copper alloy (copper 70% by weight, zinc 3
0% by weight). According to an experiment conducted by the inventor, when voltages of 14 V and 42 V were applied to a pair of bus bars formed of the second type copper alloy, a leak current was easily generated. Further, when voltages of 14 V and 42 V were applied between the terminals formed of the first type copper alloy, a leak current was easily generated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to prevent the occurrence of leakage current when a circuit to which a low voltage is applied and a circuit to which a high voltage is applied are provided. I have.

[0010]

In order to solve the above-mentioned problems, a conductive material used in an electric junction box mounted on an internal combustion engine type automobile, wherein a high voltage of a maximum voltage of 42 V from a power supply is applied to the conductive material. On the other hand, the conductive material to which the high voltage is applied includes Zn in copper as a main component,
Provided is a conductive material containing Mg and / or Fe and used for a high-voltage electrical junction box formed of a metal material having leak resistance.

As described above, the point that Zn is contained together with Cu as a main component is the same as the conventional one, but it is also necessary to further contain either Mg or Fe, or Mg and Fe. To increase leak resistance.

The metal material contains 60 to 65% by weight of Cu,
Zn is 0.1 to 35% by weight, Mg is 0.01 to 1.0% by weight, Fe is 0.01 to 1.0% by weight, and the rest is Cu.

The content of Mg and Fe is 0.01% by weight.
If it is less than 1, leakage resistance cannot be improved.
If it exceeds 0% by weight, there is a problem that conductivity, which is another performance, is remarkably reduced. If the total content of Mg and Fe exceeds 2% by weight, there is a problem that the conductivity is reduced. If the total content is less than 0.01, the leak resistance cannot be improved.

A bus bar and / or a relay terminal constituting an internal circuit of the electric junction box, a wire terminal terminal in a connector accommodated in a connector accommodating portion formed in the electric junction box, and an accommodating in a relay accommodating portion. Terminals of the relay, fuse terminals housed in the fuse housing part, and the like.

As described above, by adding Mg or / and Fe having leak resistance to a copper alloy containing Cu as a main component and containing Zn, which is excellent in conductivity, it is formed from the metal material. A conductive material such as a bus bar having excellent leak resistance can be obtained.

Therefore, even when the bus bar to which the voltage of 14 V is applied and the bus bar to which the voltage of 42 V is applied are arranged adjacent to each other, or when the bus bars to which the voltage of 42 V is applied are arranged adjacent to each other, water intrusion occurs. Also in this case, generation of a leak current can be suppressed. As a result, even if a low-voltage busbar to which a voltage of up to 14 V is applied and a high-voltage busbar to which a voltage of 42 V is applied are arranged in one electric junction box, generation of a leak current can be suppressed. Can be.

The reason why the high voltage is set to 42 V is as follows.
If the voltage is raised to more than 50V near V, it is dangerous if touched by mistake. Further, as a result of the present inventor fitting the terminal connected to the electric wire terminal to the tab of the bus bar and applying a high voltage to the bus bar and performing a salt water immersion experiment, even if the voltage is increased to 42 V, the electric component to be energized is easily melted. No loss occurred. Specifically, the voltage was applied continuously at 42 V for 8 hours, and then the application was stopped for 16 hours. Even if this was repeated twice, no ignition or melting phenomenon occurred, and melting occurred at the third time. Therefore, it has been confirmed from a normal use condition of an automobile that there is no problem even when a high voltage of 42 V is applied.

The voltage of 42 V can be easily increased to 42 V by using three commonly used batteries of rated voltage 12 V (maximum voltage 14 V) connected in series. It goes without saying that one battery with a maximum voltage of 42 V may be provided.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. First, as schematically shown in FIG.
A general passenger car to which the present invention is applied is an internal combustion engine type automobile using an engine E mounted in an engine room X for running and power generation, and a low-voltage battery 1 and a high-voltage battery 2 are provided in the engine room X. It is equipped with. The low-voltage battery 1 is a single battery having a rated voltage of 12 V and a maximum voltage of 14 V, which are widely used. The high-voltage battery 2 includes three batteries 2a, 2b, and 2c each having a rated voltage of 12 V similar to the above-described battery.
Are connected in series to have a maximum voltage of 42V. It goes without saying that one battery with a maximum voltage of 42 V may be used.

The low-voltage battery 1 is connected to a low-voltage bus bar 10 housed in an electric junction box 3 composed of a junction box mounted on the indoor side Y (in some cases, in an engine room) to connect to a low-voltage (maximum voltage). 12V). The high-voltage battery 2 is connected to a high-voltage bus bar 11 housed in the electric junction box 3 to apply a high voltage (a maximum voltage of 42 V).

As shown in FIG. 2, the electric connection box 3
The low-voltage bus bar 10 and the high-voltage bus bar 11 are fixed on one insulating plate 12 with a gap of 1 mm to 30 mm.

The busbars 10 and 11 have a Cu content of 60 to
65% by weight, 0.1 to 35% by weight of Zn, 0.0% of Mg
It is formed of a metal material containing copper as a main component and having a content of 1 to 1.0% by weight and 0.01 to 1.0% by weight of Fe. That is, a metal plate made of the metal material is punched, and then the tab 10
a and 11a are formed by bending.

Also, the relay terminals 20, 21 which are fitted adjacent to the tabs 10a, 11a are also formed of the above-mentioned metal material.

As described above, when the low-voltage bus bar 10 and the high-voltage bus bar 11 are arranged adjacent to each other, it is possible to reduce the occurrence of a leak current between these bus bars 10 and 11. Also, when the tabs 10a and 11a of the bus bars 10 and 11 are arranged adjacent to each other and the relay terminals 20 and 21 are fitted to these tabs, the tabs 10a and 1a
1a, it is possible to make it difficult to generate a leak current between 20 and 21.

When a terminal fitting connected to the wire end is connected to the relay terminals 20, 21 or a terminal of a fuse or a relay is directly connected to the relay terminals 20, 21 or the tabs 10a, 11a. Figure 4
(A) As shown in (B) and (C), a terminal metal fitting 30, a terminal 31 of a relay, and a terminal 32 of a fuse to be connected to a wire end.
Are formed of the above-mentioned metal material having excellent leak resistance.

The above embodiment relates to a general passenger car equipped with a 12V rated battery. Even in a passenger car, a maximum voltage of 28V is applied to the bus bar, and in a truck, a maximum voltage of 28V is applied to the bus bar. In this case, the bus bar to which a voltage of 28 V is applied is referred to as the low-voltage bus bar, and the bus bar to which a voltage of 42 V is applied is referred to as the high-voltage bus bar. Has been placed.

[0027]

As is apparent from the above description, according to the present invention, in order to reduce the amount of current and to prevent the wire from becoming thinner and the wire harness from becoming too large, the pressure is increased to a maximum of 1.
A low-voltage busbar to which a voltage of 4 V is applied, and a maximum of 42
When a high-voltage busbar to which a voltage of V is applied is housed in an electrical junction box, the busbar to which these different voltages are applied is formed of a metal material having excellent leak resistance. The generation of a leak current during the period can be suppressed. In addition, high voltage busbars to which a voltage of 42 V is applied are arranged adjacent to each other, and even when water is generated, since the busbars are formed from a metal material having good leak resistance, generation of a leak current can be suppressed. .

Further, not only the bus bar, but also the relay terminals and terminal fittings used as a circuit in the electric junction box are formed of a metal material having excellent leak resistance. The generation of current can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a circuit to an electric junction box using the conductive material of the present invention.

FIG. 2 is a schematic sectional view showing a state in which a bus bar is housed in the electric connection box shown in FIG.

FIG. 3 is a view showing a state in which the bus bar is arranged on an insulating plate.

FIGS. 4A, 4B, and 4C are diagrams showing other circuit materials.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-voltage battery 2 High-voltage battery 3 Electric connection box 10 Low-voltage bus bar 10a tab 11 High-voltage bus bar 11a tab 12 Insulating plate 20, 21 Relay terminal 30 Terminal fitting 31 Relay terminal 32 Fuse terminal

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Nobuhide Kato 1-14 Nishisuehiro-cho, Yokkaichi-shi, Mie F-term in Sumitomo Wiring Systems Co., Ltd. 5E077 BB11 BB18 EE29 JJ18 5G361 BA03 BB03

Claims (4)

[Claims] 1. A conductive material used in an electric junction box mounted on an internal combustion engine type vehicle, wherein a high voltage of a maximum voltage of 42 V is applied from a power source to the conductive material, and the high voltage is applied. The conductive material is a conductive material used for a high-voltage electrical junction box made of a metal material having leak resistance, in which Cu as a main component contains Zn and Mg or / and Fe is contained. 2. The metal material contains Zn in an amount of 0.1 to 35% by weight, Mg in an amount of 0.01 to 1.0% by weight, and Fe in an amount of 0.01 to 1.0% by weight.
2. The conductive material used in a high-voltage electrical junction box according to claim 1, wherein 1.0% by weight and the remainder are Cu. 3. The conductive material according to claim 1, wherein the conductive material comprises a bus bar constituting an internal circuit of the electric connection box. 4. The relay according to claim 1, wherein the conductive material is a relay terminal forming an internal circuit of the electric connection box, a wire terminal terminal in a connector housed in a connector housing formed in the electric connection box, and a relay housed in a relay housing. The conductive material used in the high-voltage electric connection box according to any one of claims 1 to 3, wherein the terminal is a terminal of a fuse and / or a terminal of a fuse accommodated in the fuse accommodating portion.