CN114649626B - Electromagnetic wave shielding structure for vehicle - Google Patents

Abstract

An electromagnetic wave shielding structure for a vehicle comprises: a battery pack including a plurality of battery stacks, each battery stack allowing a unidirectional current to flow through; and a maintenance connector that cuts off the output of the battery pack by being unplugged from the battery pack. The maintenance connector is disposed above at least one of the plurality of battery stacks, allowing a current to flow in a direction opposite to the direction of the current flowing through at least one battery stack located below.

Description

Electromagnetic wave shielding structure of vehicles

Technical Field

The present invention relates to an electromagnetic wave shielding structure of a vehicle for shielding electromagnetic waves radiated from a battery pack mounted on the vehicle.

Background technique

In the past, it is known that the battery housing of electric vehicles and the like is provided with a function of shielding electromagnetic waves. Japanese Patent Publication No. 2012-186125 shows that an electromagnetic wave shielding sheet is provided on the lid of a resin battery housing. As the electromagnetic wave shielding sheet, there can be cited an electromagnetic wave shielding sheet that is provided with conductivity by combining a conductive metal with a plastic sheet.

Here, the battery of an electric vehicle or the like has a large power and requires a large number of battery cells. Therefore, a battery pack is used, which includes a battery stack composed of a plurality of battery cells and a plurality of such battery stacks connected and accommodated in a casing.

In addition, when inspecting and repairing a vehicle, it is necessary to disconnect the high-voltage battery output from other components, and most battery packs are equipped with a maintenance connector. The maintenance connector is a plug that cuts off the output of the battery pack by pulling it out of the battery pack. The maintenance connector needs to be configured to be safe and easy to operate when necessary, for example, sometimes protruding from the floor of the vehicle and covered with a cover. Thus, it is usually protected by a cover, and the cover can be removed for operation when necessary.

Summary of the invention

In the maintenance plug as described above, a battery current normally flows. Since a high frequency is superimposed on the battery current, electromagnetic waves are also radiated from the maintenance plug, and thus this shielding measure is necessary.

The electromagnetic wave shielding structure of the vehicle of the present invention comprises: a battery pack, including a plurality of battery stacks, each battery stack allowing a unidirectional current to flow through; and a maintenance plug, which cuts off the output of the battery pack by being unplugged from the battery pack, wherein the maintenance plug is arranged above at least one battery stack among the plurality of battery stacks, allowing a current to flow in a direction opposite to the direction of the current flowing through the at least one battery stack located below.

Preferably, the plurality of battery stacks include a first battery stack and a second battery stack adjacent to each other and through which current flows in a first direction, and the maintenance connector is disposed above the first battery stack and the second battery stack and through which current flows in a second direction opposite to the first direction.

Preferably, the plurality of battery stacks include a first battery stack for current to flow in a first direction and a second battery stack for current to flow in a second direction, and the maintenance connector is disposed above the first battery stacks for current to flow in a second direction opposite to the first direction.

Preferably, the battery pack is arranged outside the vehicle compartment below a floor panel of the vehicle compartment, and the maintenance connector is arranged above the floor panel or in an opening provided in the floor panel.

According to the present invention, the radiated electromagnetic waves from the maintenance connector can be effectively shielded.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinafter, features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described with reference to the accompanying drawings, wherein like reference numerals denote like elements, and wherein:

FIG. 1 is a diagram showing a schematic internal structure of a battery pack 10 .

FIG. 2 is a schematic diagram for explaining the maintenance connector 40 , where (a) of FIG. 2 shows a disconnected state and (b) of FIG. 2 shows a connected state.

FIG. 3 is a diagram showing the arrangement state of the maintenance connector.

4 is a diagram showing the direction of current in the battery stack 20 and the maintenance connector 40 , wherein FIG4( a ) is a schematic plan view and FIG4( b ) is a schematic cross-sectional view taken along line XX of FIG4( a ).

FIG. 5 is a diagram showing another configuration example, where FIG. 5( a ) is a schematic plan view, and FIG. 5( b ) is a schematic cross-sectional view taken along the line YY of FIG. 5( a ).

Detailed ways

Hereinafter, embodiments of the present invention will be described based on the drawings. It should be noted that the present invention is not limited to the embodiments described here.

[Battery Pack Composition]

FIG. 1 is a diagram showing a schematic internal structure of a battery pack 10. In this figure, the cover is removed to show the inside of the battery pack 10. It should be noted that the battery current refers to the discharge current, which is simply referred to as the current below. In addition, in the figure, the direction of the current is indicated by a dotted arrow.

The shell 12 is a rectangular parallelepiped as a whole, and becomes tapered on the left side of the figure. When mounted on a vehicle, for example, the tapered portion is located at the front, and the front of the figure is located above the vehicle. The front side of the shell 12 is tapered in the left-right direction, and the bottom surface is also facing forward and obliquely upward, and the space 12a on the front side of the shell 12 becomes relatively narrow. In this space 12a, a battery control unit 14 is arranged as a circuit block for controlling the charging and discharging of the battery. In addition, the space 12b on the rear side of the shell 12 is a rectangular parallelepiped and is relatively wide, and a plurality of battery stacks 20 are accommodated therein. It should be noted that the upper surface of the shell 12 is a plane, and a cover is arranged here.

The cable 16 for charging and discharging the battery pack 10 is connected to the battery stack 20 via the battery control unit 14. In this example, the plurality of battery stacks 20 are four rows, and they are connected in series. In the figure, the current flows from left to right in the first battery stack 20 from the top, from right to left in the third battery stack 20, from left to right in the second battery stack 20, and from right to left in the fourth battery stack 20. Therefore, the left side of the first battery stack 20 is the negative terminal, and the left side of the fourth battery stack 20 is the positive terminal.

A maintenance plug 40 is disposed on the path of current from the first battery stack 20 to the third battery stack 20 . The maintenance plug 40 is located above the first battery stack 20 and the second battery stack 20 and supplies current from right to left in the figure.

[Maintenance connector]

FIG2 is a schematic diagram for explaining the maintenance plug 40, where (a) of FIG2 shows a disconnected state, and (b) of FIG2 shows a connected state. The maintenance plug 40 is used in pair with the socket 46. That is, by inserting the maintenance plug 40 into the socket 46, the battery pack 10 is in a connected state, and by removing the maintenance plug 40 from the socket 46, the battery pack 10 is in a disconnected state.

The maintenance connector 40 is composed of a resin base 42 and a U-shaped line 44, and the two ends 44a, 44b of the line 44 protrude from the base 42. The socket 46 is arranged in the middle of the wiring (connection wiring of the first battery stack 20 and the third battery stack 20) in the battery pack 10, and has receiving ports 46a, 46b for receiving the two ends 44a, 44b of the maintenance connector 40. And, by inserting the two ends 44a, 44b into the receiving ports 46a, 46b, the battery pack 10 is connected through the maintenance connector 40, and by pulling the two ends 44a, 44b out from the receiving ports 46a, 46b, the battery pack is disconnected through the maintenance connector 40.

FIG. 3 is a diagram showing the configuration state of the maintenance connector 40. An opening is provided at the position of the maintenance connector 40 of the cover 18 of the housing 12. A floor panel 52 constituting the floor of the vehicle compartment is located on the cover 18, and an opening is also provided at a position corresponding to the opening of the cover of the floor panel 52, and the two openings are integrated to form an opening 50. Furthermore, the maintenance connector 40 protrudes from the opening 50 toward the vehicle compartment side. In addition, the interior material 56 is configured to cover the upper portion of the maintenance connector 40.

The direction of the current in the U-shaped line 48 of the maintenance plug connector 40 is the same as the direction of the current shown in FIG1. It should be noted that the maintenance plug connector 40 is operated by grasping the base 42. The socket 46 is fixed to the housing 12 or the like by appropriate means. In addition, a locking unit or the like is preferably provided for the engagement between the maintenance plug connector 40 and the socket 46.

[Reduction of radiated magnetic field]

FIG. 4 is a diagram showing the direction of the current of the battery stack 20 and the maintenance plug 40, FIG. 4 (a) is a schematic diagram of a top view, and FIG. 4 (b) is a schematic diagram of the XX section of FIG. 4 (a). In this way, in the two battery stacks 20, the current flows in the same direction, and a radiation magnetic field is generated by the high frequency superimposed on the current. Here, the maintenance plug 40 is located above the middle of the two battery stacks 20, and the current flows in the opposite direction to the two battery stacks 20. Therefore, the high frequency superimposed here is also phase-reversed, so the magnetic field radiated from the maintenance plug 40 is offset by the magnetic field radiated from the two battery stacks 20. In particular, the maintenance plug 40 is located above the middle of the two battery stacks 20, so the radiation magnetic field from the two battery stacks 20 is easy to go around the side and top of the maintenance plug 40, which can effectively offset the radiation magnetic field from the maintenance plug 40 toward the side and top.

As described above, according to the present embodiment, the radiated magnetic field from the maintenance connector 40 , that is, the radiated electromagnetic wave can be reduced by the radiated magnetic field from the two battery stacks 20 .

[Other configuration examples]

FIG5 is a diagram showing another configuration example, FIG5(a) is a schematic top view, and FIG5(b) is a schematic cross-sectional view taken along the line Y-Y of FIG5(a). In this example, a maintenance plug 40 is arranged above a battery stack 20, and the direction of the current is opposite to that of the battery stack 20. Thus, the radiated magnetic field from the maintenance plug 40 can be reduced.

Claims (4)

1. An electromagnetic wave shielding structure for a vehicle, comprising:

a battery pack including a plurality of battery stacks, each of the battery stacks being configured to flow unidirectional current therethrough; and

a maintenance plug for cutting off the output of the battery pack by pulling out the plug from the battery pack,

the maintenance plug is arranged above at least one cell stack in the plurality of cell stacks and is used for allowing current to flow in the direction opposite to the current flowing through the at least one cell stack below.

2. The electromagnetic wave shielding structure of a vehicle according to claim 1, wherein,

the plurality of stacks includes a first stack and a second stack adjacent to each other and through which a current in a first direction flows,

the maintenance plug connector is arranged above the first battery stack and the second battery stack and used for allowing current in a second direction opposite to the first direction to flow.

3. The electromagnetic wave shielding structure of a vehicle according to claim 1, wherein,

the plurality of stacks includes a first stack through which current in a first direction flows and a second stack through which current in a second direction flows,

the maintenance plug connector is arranged above the first battery stacks and used for allowing current in a second direction opposite to the first direction to flow.

4. The electromagnetic wave shielding structure of a vehicle according to any one of claims 1 to 3, wherein,

the battery pack is disposed outside the carriage below a floor panel of the carriage, and the maintenance plug is disposed above the floor panel or in an opening provided in the floor panel.