KR20240019450A - Electric component box for automobile manufactured by inject - Google Patents

Abstract

The automotive electrical parts box according to an embodiment of the present invention is made of plastic manufactured through injection molding.
In addition, it is a plastic material manufactured through injection molding for a housing with an open upper surface.
A top cover covering the opening surface of the housing, a base cover seated on the bottom surface of the housing, a set of electrical components seated on the top surface of the base cover, and formed on at least the inner peripheral surface of the housing and the back surface of the top cover, electromagnetic waves Includes a plating layer that shields.

Description

Automotive electrical component box manufactured through injection molding {ELECTRIC COMPONENT BOX FOR AUTOMOBILE MANUFACTURED BY INJECT}

The present invention relates to an automotive electrical parts box manufactured through injection molding.

Recently, the development of technology for electric vehicles that run using electricity, a green energy, has been rapidly advancing. Most electric vehicles include a motor that generates rotational force, a battery that supplies power to the motor, an inverter that controls the rotation speed of the motor, a battery charger for charging electricity to the battery, and a low-voltage direct current converter for the vehicle ( Includes LDC (Low voltage DC/DC Converter).

The above-mentioned electrical components not only generate a lot of heat during operation, but also generate a lot of electromagnetic waves or noise that affects the operation of other electrical components. To solve this problem, a structure in which the electric components are accommodated in an electric component box equipped with an air-cooled or water-cooled heat dissipation structure and a shielding function that satisfies EMC (Electro Magnetic Compatibility) by shielding EMI electromagnetic waves is adopted.

Figure 1 is an exploded perspective view showing a conventional electrical component box for an electric vehicle.

Referring to FIG. 1, a conventional electrical component box 1 for an electric vehicle includes a bottom cover 2 provided with a cooling passage on the upper surface, and is fixed to the upper surface of the bottom cover 2 and has various electrical components inside. A housing (3) for receiving, a top cover (4) covering the open upper surface of the housing (3), and an upper sealer ( 6) and a lower sealer (5) that is inserted into the contact area between the bottom cover (2) and the housing (3) and performs a waterproof function.

A conventional electrical component box configured as described above adopts a water-cooled cooling method, and a cooling passage through which coolant flows is formed by the bottom cover 2 on the outer bottom surface of the housing 3.

In addition, for electromagnetic wave shielding, the housing 3 and top cover 4 are formed of cold rolled plate cold commercia (SPCC) or aluminum steel sheet, showing strengths in terms of cooling efficiency and EMC stability.

However, in the case of such conventional electrical box products, as the housing that shields the electrical components is molded from a metal material containing iron or aluminum, the weight of the electrical component box increases and manufacturing cost competitiveness is reduced. Furthermore, as the weight of the electrical component box increases, the vehicle's own weight also increases, causing the problem of increased electrical energy consumption.

The present invention was proposed to improve the above problems, and its purpose is to provide an electrical component box for an electric vehicle whose weight is reduced while cooling efficiency and electromagnetic wave shielding function remain the same or improve.

An automotive electrical parts box according to an embodiment of the present invention for achieving the above object includes a housing made of plastic manufactured through injection molding and having an open upper surface; A top cover made of plastic manufactured through injection molding and covering the opening surface of the housing; a base cover mounted on the bottom of the housing; A set of electrical components mounted on the upper surface of the base cover; and a plating layer formed on at least an inner peripheral surface of the housing and a rear surface of the top cover to shield electromagnetic waves.

According to the implementation of the present invention having the above configuration, the following effects are achieved.

First, some components of the electrical component box are molded using injection molded plastic materials, which has the effect of reducing the weight of the electrical component box.

Second, by plating the surface of the electrical component box with nickel or chrome to shield electromagnetic waves, there is an advantage in that the electromagnetic wave shielding function remains the same or can exhibit better shielding performance.

Third, by forming the cooling passage inside the housing of the electrical component box, not only does the thickness of the electrical component box decrease, but there is also a possibility that coolant may leak outside the electrical component box and corrode other parts of the vehicle or cause an electrical short. There is an advantage to lowering this.

Hereinafter, an electrical component box for automobiles, especially electric vehicles, according to an embodiment of the present invention will be described in detail with reference to the drawings.

Figure 2 is an external perspective view of an electrical component box according to an embodiment of the present invention, Figure 3 is an exploded perspective view of the electrical component box, Figure 4 is a bottom view of the base cover provided in the electrical component box, and Figure 5 is a bottom view of the base cover provided in the electrical component box. It is a longitudinal cross-sectional view taken along II-I' of FIG. 2, and FIG. 6 is a longitudinal cross-sectional view taken along II-II' of FIG. 2.

2 to 6, the electrical component box 10 according to an embodiment of the present invention may include an inverter, an LDC, or an On-Board Charger (OBC).

In detail, the electrical component box 10 includes a housing 11 that forms an outer shape and has an open top, a top cover 12 that covers the top opening of the housing 11, and any one of the housing 11. A power-in connector (18) mounted on the side, and the housing (1)

1), a power out connector 17 and a signal connector 19 mounted on the other side, a set of electrical components 13 accommodated inside the housing 11, and a set of electrical components 13 on which the set of electrical components 13 is seated. Base cover (14), the top cover (12) and housing (1)

1) a first sealer (15) surrounding the contact surface to provide a waterproof function, and a second sealer (15) to provide a waterproof function by interfering with the contact surface of the base cover (14) and the housing (11). Includes sealer (16).

An in-connector hole 114 for mounting the power-in connector 18 is formed on one side of the housing 11, and an out-connector hole 116 for mounting the power-out connector 17 on the other side. A signal connector hole 115 into which the signal connector 17 is mounted is formed. The signal connector hole 115 may be formed on either one side or the other side of the housing 11.

Additionally, a cooling passage 111 through which coolant flows forms a winding meander line on the bottom surface of the housing 11. In addition, a coolant inlet port 112 through which coolant flows in and a coolant outlet port 113 through which coolant is discharged are formed on the side of the housing 11. In addition, the coolant inlet port 112 and the coolant outlet port 113 communicate with the inlet and outlet portions of the cooling passage 111, respectively. Accordingly, the coolant flowing in through the coolant inlet port 112 flows along the cooling passage 111 and cools the electric component set 13 mounted on the upper surface of the base cover 14. Here, a method of increasing heat exchange efficiency may be to position electrical components with a relatively high heat generation amount at a point close to the inlet of the cooling passage 111, and electrical components with a relatively low heat generation amount to be located at a point close to the outlet part. there is.

In addition, the second sealer 16 is seated along the upper outer line of the cooling passage 111, and the base cover 14 is seated thereon, so that the cooling water flowing along the cooling passage 111 flows into the vestibule. Prevents leakage toward the parts set (13). In addition, the first sealer 15 is seated along the upper edge of the housing 111, and the top cover 12 is seated on it, preventing water or foreign substances from entering the housing 11 from the outside. block it

In addition, the base cover 14 includes a cover body 141 that covers the cooling passage 111, and a rear surface of the cover body 141, specifically a portion corresponding to the inner space of the cooling passage 111. A plurality of cooling fins 142 protrude. The plurality of cooling fins 142 are formed to be round along the shape of the cooling passage 111 when the base cover 14 is seated. In addition, the plurality of cooling fins 142 are spaced apart at regular intervals and perform heat exchange by heat conduction with the coolant flowing along the cooling passage. That is, heat generated from the electrical component set 13 is transferred to the coolant through the cooling fins 142.

In addition, the electrical component set 13 includes a switching element 131 including an IGBT (Insulated Gate Bipolar mode Transistor) that switches DC voltage and outputs it as a three-phase alternating current voltage, and one side of the upper surface of the base cover 14. It includes a DC link cap that is mounted on and stabilizes the input voltage and reduces noise of the switching element, and a power PCB, as well as various other electrical components that are not described.

Meanwhile, the housing 11 and the top cover 12 can be molded from a light plastic material through plastic injection molding using plastic resin. Since the housing 11 and the top cover 12 are made of plastic material, they have the advantage of superior weight and cost competitiveness compared to the existing case where they are molded from iron or aluminum materials. However, when the housing 11 and the top cover 12 are made of plastic material, there is a problem in that they cannot effectively shield electromagnetic waves generated from the electric component set 13.

In order to solve this problem, at least the inner peripheral surface of the housing 11 and the rear surface of the top cover 12 are plated with nickel or chrome. Electromagnetic waves emitted from the electrical component set 13 can be effectively shielded by the nickel or chrome plating treatment. The minimum thickness of the plating layer may be 15 micrometers for copper (Cu) plating, 10 micrometers for nickel, and 0.2 micrometers for chrome plating, and the maximum thickness may be 20 micrometers for copper (Cu) plating, 15 micrometers for nickel plating, and 0.3 micrometers for chrome plating. It could be meters. Copper, nickel, and chrome plating layers may be formed sequentially within the above maximum and minimum thickness ranges.

In addition, in the case of the existing electrical component box, the cooling passage and cooling fins are formed protruding from the outer bottom surface of the housing, and the bottom opening of the cooling passage is shielded by a separate bottom cover, so the electrical component box is protected. There was a problem that the thickness had to increase. Furthermore, a problem occurred where coolant leaked from the cooling passage and corroded other parts of the vehicle. However, in the case of the present invention, the cooling passage 111 is formed on the inner bottom surface of the housing, and the upper surface of the cooling passage 111 is shielded by the base cover 14. In addition, since the open upper surface of the cooling passage 111 faces upward when the electrical component box 10 is mounted in the vehicle, there is an advantage in that the phenomenon of coolant leaking into the upper surface of the cooling passage is eliminated.

Additionally, in the case of the existing electrical component box, the cooling passage is formed on the outer bottom of the housing, and a separate plate on which the electrical components are seated is located on the inner bottom of the housing, which has the disadvantage of low cooling efficiency. However, in the case of the present invention, since the base cover 14 is seated on the upper surface of the cooling passage and the electrical component set 13 is seated on the upper surface of the base cover 14, there is an advantage in that heat exchange efficiency is increased. That is, since the heat emitted from the electrical component set 13 passes only through the base cover 14, heat exchange occurs directly with the coolant, thereby significantly increasing heat exchange efficiency compared to the conventional double bottom structure.

In addition, since the material of the base cover 14 is aluminum, cold rolled steel, or other types of metal plates that can shield electromagnetic waves and have high thermal conductivity, the housing covered by the base cover 14 ( 1 There is no need for separate plating treatment on the bottom part of 1). Therefore, there is an effect of reducing plating processing costs.

Claims (10)

A housing made of plastic manufactured through injection molding and having an open upper surface;
A top cover made of plastic manufactured through injection molding and covering the opening surface of the housing; a base cover mounted on the bottom of the housing;
A set of electrical components mounted on the upper surface of the base cover; and
An automotive electrical component box manufactured through injection molding including a plating layer formed on at least an inner peripheral surface of the housing and a rear surface of the top cover to shield electromagnetic waves. According to claim 1,
The plating layer is a metal plating layer in which either or both chromium and nickel are applied to a copper (Cu) plating layer. An automotive electrical component box manufactured through injection molding. According to claim 2,
An automotive electrical parts box manufactured through injection molding, characterized in that the thickness of the copper plating layer is in the range of 15 micrometers to 20 micrometers. According to claim 3,
An automotive electrical parts box manufactured through injection molding, characterized in that the thickness of the nickel plating layer is in the range of 10 micrometers to 15 micrometers. According to claim 3 or 4,
An automotive electrical parts box manufactured through injection molding, characterized in that the thickness of the chrome plating layer is in the range of 0.2 micrometer to 0.3 micrometer. According to claim 1,
A cooling passage is formed at a predetermined depth on the inner bottom surface of the housing and has an open upper surface,
An automotive electrical parts box manufactured through injection molding, characterized in that the opening surface of the cooling passage is shielded by the base cover. According to claim 6,
An automotive electrical parts box manufactured through injection molding, wherein the base cover is a metal plate containing aluminum or iron with high thermal conductivity. The method of claim 7, wherein the base cover:
A cover body that shields the cooling passage,
An automotive electrical parts box manufactured through injection molding including a plurality of cooling fins protruding from the bottom of the cover body and placed on the cooling passage. According to claim 6,
An automotive electronic parts box manufactured through injection molding, further comprising a sealer placed along the outer line of the cooling passage and pressed by the base cover. According to claim 1,
An automotive electronic parts box manufactured through injection molding, further comprising a sealer placed along an edge of the housing and compressed by the top cover.