JP2013071702A - Electromagnetic wave shielding cover for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic wave shielding cover for a vehicle, which is lighter than a conventional one, and can be manufactured at low cost.SOLUTION: A vehicular under cover 10, which forms a portion of a vehicular bottom wall 92, and covers a whole group of battery modules 30 from below. On the upper surface of a cover body 17, a noise shielding sheet 11 is laid which is constituted by an aluminum layer 12 sandwiched between a pair of resin layers 13, 13. On the upper surface of the noise shielding sheet 11, a connection part 20 is exposed which is electrically connected to the aluminum layer 12.

Description

  The present invention relates to an electromagnetic shielding cover for a vehicle that shields electromagnetic waves from a power supply unit of an electric vehicle.

  As a conventional electric vehicle, as shown in FIG. 6, an electric vehicle 1 including a battery module group 3 composed of a plurality of battery cells at the bottom of a vehicle body 2 is known (see, for example, Patent Document 1). In the electric vehicle 1, the metal mesh 5 is laid on the vehicle under cover 4 disposed below the battery module group 3 in order to suppress the influence of electromagnetic wave noise generated from the battery module group 3.

JP 2009-83599 A (Claim 3, [0053])

  However, in the conventional vehicle undercover 4 described above, the metal mesh 5 is heavy, which hinders weight reduction of the vehicle. Further, since the metal mesh 5 is made of stainless steel to prevent corrosion, there is a problem that the manufacturing cost increases.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic wave shield cover for a vehicle that can be manufactured at a lower weight and at a lower cost.

  An electromagnetic shielding cover for a vehicle according to the invention of claim 1 made in view of the above circumstances is an electromagnetic shielding cover for a vehicle that covers a battery module group installed in an electric vehicle, and the electromagnetic shielding cover for a vehicle is made of resin. A sheet fixing with a noise blocking sheet fixed to the cover body on one side of the cover body with a noise blocking sheet with a conductive metal layer sandwiched between a pair of resin layers. And a connecting portion that is provided on the outer surface of the noise shielding sheet and that is conductively connected to the conductive metal layer through the resin layer and that can be conductively connected to the conductive metal mass in the vehicle body of the electric vehicle. Has characteristics.

  Invention of Claim 2 is the electromagnetic wave shield cover for vehicles of Claim 1, in the state penetrated by the plate-shaped terminal metal fitting, the through-hole formed in the plate-shaped terminal metal fitting, and the through-hole formed in the noise shielding sheet. It is characterized in that the connecting portion is constituted by a rivet that is crimped and fixed in a state in which the plate-shaped metal terminal and the conductive metal layer are conductively connected.

  According to a third aspect of the present invention, in the vehicle electromagnetic wave shield cover according to the second aspect, the through hole of the noise blocking sheet has a shape in which a slit is radially expanded from the center thereof, and a plurality of edges at the edge of the through hole are formed. It is characterized in that the projecting piece is pushed out with rivets.

  According to a fourth aspect of the present invention, in the vehicle electromagnetic wave shield cover according to any one of the first to third aspects, the resin layer of the noise blocking sheet and one surface of the cover body are used as the sheet fixing means. It is characterized in that it has a welded part that has been welded.

[Invention of Claim 1]
The electromagnetic wave shielding cover for a vehicle according to the invention of claim 1 has a configuration in which a noise shielding sheet in which a conductive metal layer is sandwiched between a pair of resin layers is laid, compared with a conventional metal mesh, Weight reduction can be achieved. Further, since the conductive metal layer is prevented from being exposed by the pair of resin layers, it is not necessary to use a metal subjected to rust prevention treatment, and the manufacturing can be performed at low cost.

[Invention of claim 2]
According to the invention of claim 2, since the plate-shaped terminal fitting and the noise shielding sheet are sandwiched by the rivets, it is possible to stably connect the plate-shaped terminal fitting and the conductive metal layer.

[Invention of claim 3]
According to the invention of claim 3, since the conductive metal layer exposed on the inner side surface of the through hole and the rivet can be brought into contact with each other, the conductive metal layer and the plate-shaped terminal fitting can be reliably conductively connected.

[Invention of claim 4]
According to the invention of claim 4, it becomes easy to lay the noise blocking sheet on one surface of the resin cover body.

Vehicle under cover and battery module group perspective view Vehicle undercover perspective view Side cross-sectional view of vehicle undercover and battery module group Side cross-sectional view of noise blocking sheet and metal plate Partially enlarged plan view of noise blocking sheet Exploded perspective view of a conventional electric vehicle

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the electric vehicle 90 according to this embodiment includes a plurality of battery modules 31 at the bottom of a vehicle body 91. A plurality of battery modules 31 are arranged in a matrix in the front-rear direction and the left-right direction of the vehicle, and the battery module group 30 is configured by the plurality of battery modules 31. Each battery module 31 includes a battery cell and an electrical component.

  As shown in FIG. 3, the lower side of the battery module group 30 is covered with a vehicle bottom wall 92 facing the road surface. And the part arrange | positioned under the battery module group 30 among the vehicle bottom walls 92 is the vehicle undercover 10 equivalent to the "vehicle electromagnetic wave shield cover" of this invention.

  The vehicle undercover 10 is an injection-molded product of synthetic resin, and includes a container-like cover body 17 having a flat portion 10H having a larger area than the battery module group 30 at the bottom. As shown in FIG. 2, a noise blocking sheet 11 is provided on the upper surface of the flat portion 10 </ b> H, that is, the entire surface facing the battery module group 30. As shown in FIG. 4, the noise blocking sheet 11 has a sandwich structure in which an aluminum layer 12 (thickness of 40 μm or more) is sandwiched between a pair of resin layers 13 (thickness of 20 μm or more).

  Specifically, the resin layer 13 and the cover body 17 are both made of polypropylene resin, and the noise blocking sheet 11 is fixed to the cover body 17 by welding the resin layer 13 to the upper surface of the cover body 17 at a plurality of locations. Yes.

  As shown in FIG. 3, a connection portion 20 for connecting the aluminum layer 12 and the vehicle main body 91 and grounding is exposed on the upper surface of the noise shielding sheet 11. Specifically, as shown in the figure, one end portion of the conductive wire 23 is connected to the connecting portion 20, and the other end portion of the conductive wire 23 is connected to the vehicle main body 91, so that the aluminum layer 12 of the noise shielding sheet 11 is connected. It is possible to take the ground.

  As shown in FIG. 4, the connecting portion 20 is formed on the noise shielding sheet 11 and the metal plate 22 (corresponding to the “plate-shaped terminal fitting” of the present invention) arranged along the upper surface of the noise shielding sheet 11. The eyelet 21 (corresponding to the “rivet” of the present invention) inserted through both the through hole 11A and the through hole 22A formed in the metal plate 22 is configured. The noise blocking sheet 11 and the eyelet 21 are sandwiched between flange portions 21F formed at both ends of the eyelet 21, so that the eyelet 21 and the aluminum layer 12 are fixed in a conductive connection state.

  FIG. 5 shows the noise blocking sheet 11 in a state before the eyelet 21 is inserted. The through-hole 11A of the noise blocking sheet 11 has a shape in which, for example, four slits 15 spread radially from the center of the cross-sectional shape, and a circumscribed circle (circle shown by a one-dot chain line in FIG. ) Is substantially the same as the outer diameter of the shaft 21J of the eyelet 21 (see FIG. 4). When the eyelet 21 is inserted into the through hole 11 </ b> A, the plurality of projecting pieces 16 sandwiched between the adjacent slits 15 are pushed and expanded by the eyelet 21. Thereby, the aluminum layer 12 exposed at the end face of the protruding piece 21 can be brought into contact with the eyelet 21 or the metal plate 22, and the aluminum layer 12 and the metal plate 22 can be reliably connected to each other. Further, the resin layer 13 covering the projecting piece 16 portion is peeled off to expose the aluminum layer 12, so that the conductive connection between the aluminum layer 12 and the metal plate 22 can be further ensured. In addition, as a method of peeling the resin layer 13, cut | disconnecting the surface of the noise interruption sheet | seat 11 with a cutter etc. and excising the resin layer 13 is mentioned, for example.

  The description of the configuration relating to the vehicle undercover 10 of the present embodiment is as described above. In the vehicle undercover 10 according to the present embodiment, a noise blocking sheet 11 having an aluminum layer 12 sandwiched between a pair of resin layers 13 and 13 is laid on the upper surface of the cover main body 17. Compared with a vehicle undercover in which a mesh is laid, the weight can be reduced. In addition, since the aluminum layer 12 is prevented from being exposed by the pair of resin layers 13 and 13, it is not necessary to use a metal subjected to rust prevention treatment, and manufacturing can be performed at low cost.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) In the above embodiment, the number of the slits 15 of the through hole 11A of the noise blocking sheet 11 is four, but may be three or five or more.

  (2) An upper surface protrusion projecting from the upper surface of the cover main body 17 is provided, and the noise blocking sheet 11 is fixed to the cover main body 17 by heat caulking with the upper surface protrusion penetrating the noise blocking sheet 11. Also good.

  Further, heat caulking may be performed in a state where the upper surface protrusion is inserted inside the metal plate 22.

  (3) In the above embodiment, the noise blocking sheet 11 is fixed to the cover body 17 by welding. However, for example, the noise blocking sheet 11 may be fixed by a mechanical means such as a clip, or may be fixed by an adhesive. .

  (4) In the above-described embodiment, the example in which the present invention is applied to the vehicle under cover 10 attached to the lower side of the vehicle has been described.

  Although not included in the technical scope of the present invention, the vehicle electromagnetic wave shield cover of the present invention may be applied to a vehicle undercover of a hybrid vehicle.

10 Vehicle under cover (Electromagnetic wave shield cover for vehicles)
11 Noise blocking sheet 12 Aluminum layer (conductive metal layer)
13 Resin layer 15 Slit 16 Projection piece 17 Cover body 20 Connection part 21 Eyelet 22 Metal plate (Plate-shaped terminal fitting)
30 battery module group 90 electric vehicle 91 vehicle body 92 vehicle bottom wall

Claims (4)

An electromagnetic shielding cover for a vehicle that covers a group of battery modules installed in an electric vehicle,
The vehicle electromagnetic wave shield cover is provided with a noise shielding sheet having a conductive metal layer sandwiched between a pair of resin layers laid on one side of a resin cover body at a portion corresponding to the battery module group,
Sheet fixing means for fixing the noise blocking sheet to the cover body;
A connecting portion that is provided on an outer surface of the noise shielding sheet and that is conductively connected to the conductive metal layer through the resin layer and that can be conductively connected to a conductive metal mass in a vehicle body of the electric vehicle; An electromagnetic shielding cover for vehicles. A plate-shaped terminal fitting;
A rivet that is caulked in a state of being inserted through a through hole formed in the plate-shaped terminal fitting and a through-hole formed in the noise blocking sheet, and is fixed in a state where the plate-shaped terminal fitting and the conductive metal layer are conductively connected. The vehicle electromagnetic wave shield cover according to claim 1, wherein the connection portion is configured as described above.   The through hole of the noise blocking sheet has a shape in which a slit is radially expanded from the center thereof, and a plurality of projecting pieces at the edge of the through hole are spread by the rivet. The electromagnetic wave shield cover for vehicles according to 2.   4. The apparatus according to claim 1, wherein the sheet fixing unit includes a welding portion that welds the resin layer of the noise blocking sheet and one surface of the cover main body. 5. Electromagnetic shielding cover for vehicles.

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