Electric automobile

The present invention relates to an electric vehicle that is driven by a battery-powered motor.

It is known that an electric vehicle powered by a battery generates electromagnetic waves from, for example, a motor or a current control circuit. Electromagnetic waves generated in electric vehicles may affect various electric parts mounted on the vehicle body. Therefore, it is desirable to take electromagnetic shield measures for electrical components that may be affected by electromagnetic waves or electrical components that are sources of electromagnetic waves.

For example, as a measure against electromagnetic shielding of a battery case, as described in Patent Document 1 below, it has been proposed to apply an electromagnetic shielding coating having an effect of reflecting electromagnetic waves to the surface of the battery case.<patcit num="1"><text>Japanese Unexamined Patent Publication No. 8-186390</text></patcit>

<p> When the electromagnetic shield paint is applied to the surface of the battery case or the like as in Patent Document 1, in addition to the electromagnetic shield paint itself being expensive, a step of applying the paint and a step of drying the paint are required. Not only is it time consuming to take measures against electromagnetic shielding, but it is also extremely expensive.</p><p> In order to reduce the amount of electromagnetic shield paint used, it is conceivable to apply the electromagnetic shield paint only around the electrical components to be shielded inside the battery case. Alternatively, it is conceivable to arrange an electromagnetic shield member such as an iron plate inside the battery case. However, providing such a conductive member inside the battery case is not preferable because it creates a factor of an electrical short circuit in a narrow space inside the battery case in a high voltage atmosphere. ..</p><p> Therefore, an object of the present invention is to provide an electric vehicle capable of relatively easily shielding electromagnetic waves with respect to a battery unit mounted on a vehicle body.</p>

<p> The electric vehicle of the present invention includes a frame structure including a pair of left and right metal side members arranged at a lower portion of a vehicle body, a metal floor panel provided on the frame structure, and a lower surface side of the floor panel. It has a battery case arranged between a pair of side members, and a battery module and an electric component electrically connected to the battery module are housed inside the battery case, and the upper side of the electric component is formed by the floor panel. Electromagnetically shielded battery unit and<u style="single">A metal girder member arranged under the battery case and extending in the width direction of the vehicle body, an insert member including a metal plate embedded in a resin constituting the battery case, and an insert member provided on the metal plate. Embedded nut and</u>Arranged on the front side of the vehicle body with respect to the electric parts<u style="single">Has the metal plate</u>The front electromagnetic shield and the electrical components are located on the rear side of the vehicle body.<u style="single">Has the metal plate</u>The rear electromagnetic shield portion, the lower electromagnetic shield portion arranged on the lower surface side of the battery case, and the lower electromagnetic shield portion.<u style="single">It is an electric vehicle provided at both ends of the girder member and having a fastening portion fixed to the battery case by the embedded nut and a bolt, and the fastening portion is fixed to the side member by a bolt.</u></p><p> In one embodiment of the present invention, the front electromagnetic shield portion and the rear electromagnetic shield portion are each composed of a metal insert member embedded inside a resin constituting the battery case.</p><p> Further, an undercover that covers the battery case from below may be arranged below the battery case, and the lower electromagnetic shield portion may be configured by a shield member provided on the undercover.</p><p> In the present invention, a metal girder member extending in the width direction of the vehicle body is provided on the lower side of the battery case, both ends of the girder member are supported by the pair of side members, and the lower side is supported by the girder member. The shield member that comprises the electromagnetic shield portion and is provided on the undercover does not have to be provided at a position that overlaps with the metal girder member when viewed from above the vehicle body.</p>

<p> According to the present invention, it is possible to prevent an electric component built in a battery unit or the like arranged under the floor panel of an electric vehicle from being affected by electromagnetic waves. In addition, it is possible to prevent electromagnetic waves generated from the battery unit from affecting surrounding electrical components and the like.</p>

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. FIG. 1 shows an example of the electric vehicle 10. The electric vehicle 10 includes a traveling motor 12 and a charging device 13 arranged at the rear of the vehicle body 11, a battery unit 14 arranged under the floor of the vehicle body 11, and the like. A heat exchange unit 15 for heating and cooling is arranged at the front of the vehicle body 11.

The front wheels 20 of the automobile 10 are supported by the vehicle body 11 by a front suspension (not shown). The rear wheel 21 is supported by the vehicle body 11 by a rear suspension (not shown). An example of a rear suspension is a trailing arm type rear suspension.

FIG. 2 shows a frame structure 30 forming a skeleton of the lower part of the vehicle body 11 and a battery unit 14 attached to the frame structure 30. The frame structure 30 includes a pair of left and right side members 31, 32 extending in the front-rear direction of the vehicle body 11, and cross members 33, 34, 35 extending in the width direction of the vehicle body 11. The cross members 33, 34, 35 are fixed in place on the side members 31, 32 by welding. The side members 31, 32 and the cross members 33, 34, 35 are both made of metal (eg steel). That is, the side members 31 and 32 also function as electromagnetic shields for blocking electromagnetic waves from the left and right sides of the battery unit 14.

Suspension arm support brackets 40 and 41 are provided at the rear of the side members 31 and 32. The suspension arm support brackets 40 and 41 are fixed by welding to the predetermined positions of the side members 31 and 32, respectively. A pivot portion 42 is provided on the suspension arm support brackets 40 and 41. The front end portion of the trailing arm is attached to these pivot portions 42.

As shown in FIG. 3, the battery unit 14 includes a battery case 50. The battery case 50 includes a tray member 51 located on the lower side and a cover member 52 located on the upper side. A front battery housing portion 55 is formed in the front half portion of the battery case 50. A rear battery housing portion 56 is formed in the latter half of the battery case 50. A central battery storage unit 57, an electric circuit storage unit 58, and the like are formed between the front battery storage unit 55 and the rear battery storage unit 56.

The battery modules 60 (only a part of which is shown by a two-dot chain line in FIG. 3) are housed in the battery housings 55, 56, and 57, respectively. An example of the battery module 60 is one in which a plurality of cells made of a lithium ion battery are connected in series.

The electric circuit storage unit 58 houses electric components 61 (partially shown in FIGS. 3 and 7) that control the monitor and control for detecting the state of the battery module 60. The electrical component 61 is electrically connected to the battery module 60. Since the electric component 61 may be affected by electromagnetic waves, electromagnetic shield measures described later are taken.

As shown in FIG. 4, the battery unit 14 is arranged on the lower surface side of the steel floor panel 70 having an electromagnetic shielding effect. The floor panel 70 magnetically shields the upper side of the electrical component 61. That is, the floor panel 70 also functions as an upper electromagnetic shield portion for blocking electromagnetic waves from above the battery unit 14. The floor panel 70 also functions as a shield that prevents electromagnetic waves generated from the battery unit 14 from going upward. The floor panel 70 extends in the front-rear direction and the width direction of the vehicle body 11 to form the floor portion of the vehicle body 11.

The floor panel 70 is fixed to a predetermined position of the frame structure 30 including the side members 31, 32 by welding. The front seat 71 (shown in FIG. 1) and the rear seat 72 are arranged above the floor panel 70. The front battery compartment 55 of the battery unit 14 is arranged below the front seat 71. The rear battery housing portion 56 of the battery unit 14 is arranged below the rear seat 72. The recess 70a of the floor panel 70 formed between the front battery compartment 55 and the rear battery compartment 56 is located near the foot space of the occupant seated on the rear seat 72.

The tray member 51 is a molded product obtained by inserting a reinforcing metal insert member 200 (shown in FIG. 7) into an integrally molded synthetic resin, and is molded into a box shape with an open upper surface side. There is. The synthetic resin, which is the material of the tray member 51, is reinforced by, for example, fibers. A cover mounting surface 80 (shown in FIG. 3) is formed on the peripheral edge of the upper surface of the tray member 51. The cover mounting surface 80 is continuous over the entire circumference of the tray member 51. A waterproof sealing material 81 is provided on the cover mounting surface 80.

As shown in FIG. 7, the insert member 200 includes three metal plates 200a, 200b, 200c located on the front side of the tray member 51 and three metal plates 200d, 200e located on the rear side of the tray member 51. , 200f and is included. These metal plates 200a to 200f are made of a metal material having an electromagnetic shielding effect and high bending rigidity, for example, a steel plate.

The metal plates 200a, 200b, and 200c located on the front side are embedded at positions corresponding to the front side and the left and right sides of the front side battery storage portion 55 of the tray member 51, respectively. A pair of left and right reinforcing plates 201 extending rearward are provided at both ends of the metal plate 200a in the center of the front side. These reinforcing plates 201 are provided inside the resin constituting the partition wall 51a of the tray member 51. These metal plates 200a, 200b, and 200c have a function of reinforcing the peripheral wall of the tray member 51. The metal plate 200a in the center of the front side also functions as a front electromagnetic shield portion located on the front side of the vehicle body with respect to the electric component 61.

A plurality of holes 202 are formed in these reinforcing plates 201 in order to improve the bite with the resin constituting the partition wall 51a. Further, each metal plate 200a, 200b, 200c is provided with an embedded nut 203 protruding in the horizontal direction, an anchor bolt 204 protruding upward, and a nut portion 205 having a screw hole.

The metal plates 200d, 200e, and 200f on the rear side are embedded at positions corresponding to the rear side and the left and right sides of the rear battery storage portion 56 of the tray member 51, respectively. Anchor bolts 206 projecting upward and nut portions 207 having screw holes are provided on the upper surfaces of the metal plates 200d, 200e, and 200f. Embedded nuts 208 protruding in the horizontal direction are fixed to a pair of left and right metal plates 200e and 200f. These metal plates 200d, 200e, 200f have a function of reinforcing the peripheral wall of the tray member 51.

The metal plate 200d at the center of the rear side also functions as a rear electromagnetic shield portion located on the rear side of the vehicle body with respect to the electric component 61. In addition, in order to enhance the electromagnetic shield effect on the front and rear of the electric component 61, electromagnetic shield members such as metal mesh may be provided on the front wall and the rear wall of the battery case 50, respectively. Further, in order to enhance the electromagnetic shield effect on both the left and right sides of the battery case 50, electromagnetic shield members such as metal mesh may be provided on the left and right side walls of the battery case 50, respectively.

The cover member 52 is made of an integrally molded product of synthetic resin reinforced with fibers. An opening 85 for a service plug and a cooling air inlet 86 are formed in the front portion of the cover member 52. A bellows-shaped rubber boot 87 is attached to the opening 85 for the service plug. A bellows-shaped rubber boot 88 is also attached to the cooling air inlet 86. On the upper surface of the cover member 52, a bypass flow path portion 90 for allowing a part of the cooling air to flow, a cooling fan accommodating portion 91, and the like are provided.

A flange portion 95 is formed on the peripheral edge portion of the cover member 52. The flange portion 95 is continuous over the entire circumference of the cover member 52. A metal rear metal plate (not shown) for preventing rear collision is arranged on the rear surface of the cover member 52. This rear-side metal plate is fixed to the tray member 51 together with the flange portion 95 of the cover member 52, and can function as a rear-side electromagnetic shield portion.

The flange portion 95 of the cover member 52 is placed on the cover mounting surface 80 of the tray member 51. Then, the tray member 51 and the cover member 52 are watertightly fixed to each other via the sealing material 81 by the bolt 96 or the nut 97 shown in FIG.

A plurality of (for example, four) girder members 101, 102, 103, 104 are provided on the lower surface side of the tray member 51. As shown in FIGS. 3 and 5, the girder members 101, 102, 103, 104 have girder bodies 111, 112, 113, 114 extending in the width direction of the vehicle body 11, respectively.

Fastening portions 121 and 122 are provided at both ends of the first girder body 111 from the front. Fastening portions 123 and 124 are provided at both ends of the second girder body 112 from the front. Fastening portions 125 and 126 are provided at both ends of the third girder body 113 from the front. Fastening portions 127 and 128 are provided at both ends of the fourth (rearmost) girder body 112 from the front. A pair of left and right front support members 130 and 131 are provided at the front end of the battery unit 14.

The girder members 101, 102, 103, 104 are made of a metal material (for example, a steel plate) that has sufficient strength to support the load of the battery unit 14 and has an effect of shielding electromagnetic waves. That is, the girder members 101, 102, 103, 104 also function as a lower electromagnetic shield portion for blocking electromagnetic waves from below the battery unit 14.

Bolt insertion holes 143 (shown in FIGS. 2 and 3) penetrating in the vertical direction are formed in each of the fastening portions 121 and 122 provided at both ends of the first girder member 101 from the front. The side members 31, 32 are provided with battery unit mounting portions 145, 146 provided with nut members at positions facing the fastening portions 121, 122. The first bolt 147 (shown in FIGS. 2 and 4) is inserted into the bolt insertion hole 143 from the lower side of the fastening portions 121 and 122, and this bolt 147 is screwed into the nut member of the battery unit mounting portions 145 and 146 and tightened. The fastening portions 121 and 122 of the girder member 101 are fixed to the side members 31 and 32.

Bolt insertion holes 153 (shown in FIGS. 2 and 3) penetrating in the vertical direction are formed in each of the fastening portions 123 and 124 provided at both ends of the second girder member 102 from the front. The side members 31, 32 are provided with battery unit mounting portions 155, 156 provided with nut members at positions facing the fastening portions 123, 124. From the underside of the fastening portions 123, 124, insert the bolt 157 (shown in FIGS. 2 and 4) into the bolt insertion hole 153, and screw the bolt 157 into the nut member of the battery unit mounting portions 155, 156 to tighten it. The fastening portions 123, 124 of the girder member 102 of the above are fixed to the side members 31, 32.

Bolt insertion holes 163 (shown in FIGS. 2 and 3) penetrating in the vertical direction are formed in each of the fastening portions 125 and 126 provided at both ends of the third girder member 103 from the front. As shown in FIGS. 4 and 5, the load transmitting members 170, 171 are fixed to the side members 31, 32 by bolts 172. These load transmitting members 170, 171 are provided above the fastening portions 125, 126 of the third girder member 103 from the front. One load transmission member 170 is welded to one suspension arm support bracket 40. The other load transmitting member 171 is welded to the other suspension arm support bracket 41.

That is, the load transmission members 170, 171 are coupled to the side members 31, 32 and the suspension arm support brackets 40, 41. These load transmitting members 170 and 171 form a part of the frame structure 30. The load transmitting members 170,171 are provided with battery unit mounting portions 175,176 provided with nut members.

By inserting the bolt 177 into the bolt insertion hole 163 from the lower side of the fastening portion 125,126 and screwing and tightening the bolt 177 into the nut member of the battery unit mounting portion 175,176, the fastening portion 125,126 of the third girder member 103 is released. , Fixed to side members 31, 32 via load transfer members 170, 171.

Bolt insertion holes 193 (shown in FIGS. 2 and 3) penetrating in the vertical direction are formed in each of the fastening portions 127 and 128 of the fourth girder member 104 from the front. The side members 31 and 32 are provided with extension brackets 194 and 195 at positions facing the fastening portions 127 and 128. The extension brackets 194 and 195 extend below the kick-up portions 31b and 32b of the side members 31 and 32. Extension brackets 194,195 form part of the frame structure 30. These extension brackets 194 and 195 are provided with battery unit mounting portions 196 and 197 provided with nut members.

Insert bolts 198 (shown in FIGS. 2 and 4) into the bolt insertion holes 193 from below the fastening portions 127 and 128, and screw the bolts 198 into the nut members of the battery unit mounting portions 196 and 197 of the extension brackets 194 and 195 to tighten them. As a result, the fastening portions 127,128 of the fourth girder member 104 are fixed to the side members 31, 32 via the extension brackets 194, 195.

As shown in FIG. 4, the lower surfaces of the girder members 101, 102, 103, 104 are located on the same plane L extending in the horizontal direction along the flat lower surface of the tray member 51. The first and second girder members 101, 102 are directly fixed to the battery unit mounting portions 145, 146, 155, 156 provided in the horizontal portions 31a, 32a of the side members 31, 32.

The third girder member 103 and the fourth girder member 104 are fixed to the battery unit mounting portions 175, 176, 196, 197 provided below the kick-up portions 31b, 32b of the side members 31, 32. That is, the third and fourth girder members 103 and 104 are offset below the kick-up portions 31b and 32b. Therefore, the third girder member 103 is fixed to the battery unit mounting portions 175,176 via the load transmitting members 170,171 having a thickness in the vertical direction. The fourth girder member 104 is fixed to the battery unit mounting portions 196,197 by extension brackets 194,195 extending downward from the kickup portions 31b, 32b.

The front support members 130 and 131 located at the front end of the battery unit 14 project to the front of the first girder member 101 from the front. The front support members 130 and 131 are coupled to the girder member 101. As shown in FIG. 2, the fastening portions 210 and 211 provided on the front support members 130 and 131 are fixed to the battery unit mounting portions 213 and 214 of the cross member 33 by bolts 212.

As described above, in the electric vehicle 10 of the present embodiment, the girder members 101, 102, 103, 104 are provided between the left and right side members 31, 32, and the side members 31, 32 are connected to each other by these girder members 101, 102, 103, 104. Therefore, the girder members 101, 102, 103, 104 of the battery unit 14 can function as rigid members corresponding to the cross members.

Further, the load transmission members 170,171 are fixed to the spension arm support brackets 40,41, and the lateral load input to the suspension arm support brackets 40,41 is input to the girder member 103 via the load transmission members 170,171. ..

Therefore, even if the cross member is not arranged near the suspension arm support brackets 40 and 41, the rigidity near the suspension arm support brackets 40 and 41 can be increased by the girder member 103, and the steering stability and riding comfort are improved. To do. In other words, a part of the large battery unit 14 can be arranged in the space between the pair of left and right suspension arm support brackets 40 and 41. Therefore, a large battery unit 14 can be mounted, and the mileage of the electric vehicle can be extended.

As shown in FIGS. 1 and 4 to 7, the undercover 400 is arranged below the battery unit 14. The upper surface of the undercover 400 faces the lower surface of the girder members 101, 102, 103, 104. An example of the material for the undercover 400 is a synthetic resin reinforced with glass fiber. The undercover 400 is divided into, for example, a first half 400a and a second half 400b, and by connecting these first half 400a and the second half 400b, one undercover 400 is formed. In addition, the undercover may be integrated over the entire length.

In this undercover 400, after the battery unit 14 is fixed to the frame structure 30 by the bolts 147,157,177,198,212, at least one of the frame structure 30 and the girder members 101,102,103,104 is provided from the lower side of the vehicle body 11 by bolts 401 (shown in FIG. 6). It is fixed to the part.

The total length of the undercover 400 is larger than the total length of the battery unit 14. That is, the undercover 400 has a length sufficient to cover the front end 50a to the rear end 50b of the battery case 50. The width of the undercover 400 is larger than the width of the battery unit 14.

As shown in FIGS. 5 and 6, the undercover 400 is arranged between the pair of left and right side members 31, 32. The front portion of the undercover 400 is fixed to the front cross member 33a by the bolt 401. The central portion of the undercover 400 is fixed to the girder members 101, 102, 103, 104 and the tray member 51. The rear portion of the undercover 400 is fixed by bolts 401 to a bracket (not shown) provided on the rear cross member 35a (shown in FIG. 6). The undercover 400 has an area sufficient to cover the entire bottom surface of the battery unit 14 when viewed from below the vehicle body 11.

Since the undercover 400 has an open rear side, the metal plates 200d, 200e, 200f embedded in the rear part of the tray member 51 and the rear side metal plate arranged on the rear surface of the cover member 52. As a countermeasure against electromagnetic shielding on the rear side of the battery unit 14.

The undercover 400 covers the lower part of the bolts 147,157,177,198,212. Therefore, even if the bolts 147,157,177,198,212 should come off, these bolts will fall on the undercover 400, and the bolts will come off due to the sound of the bolts hitting the undercover 400 or the sound of the bolts rolling while driving. It is possible to know.

On the peripheral edge of the undercover 400, a component fall prevention wall 402 (shown in FIGS. 1 and 4) having a convex shape is formed. It is preferable that the component fall prevention wall 402 is provided at a position where at least the bolts 147, 157, 177, 198, 212 can be prevented from rolling down from the top of the undercover 400 on the entire circumference of the undercover 400. Parts such as bolts that have fallen on the undercover 400 are retained inside the undercover 400 by the component fall prevention wall 402, so that parts such as bolts are prevented from falling on the road.

As shown in FIG. 1, the undercover 400 is provided with a shield member 405 having an electromagnetic shielding effect. An example of the shield member 405 is a metal mesh formed by braiding metal wires in a mesh pattern.

The shield member 405 has a function of protecting the electrical component 61 (shown in FIGS. 3 and 6) housed inside the battery case 50 from electromagnetic waves. In particular, the shield member 405 of the undercover 400 can prevent electromagnetic waves generated from the motor 12 and the like from reaching the battery case 50 from the lower side of the vehicle body 11. That is, the undercover 400 provided with the shield member 405 also functions as a lower electromagnetic shield portion for blocking electromagnetic waves from below the battery unit 14.

If an electrical component that generates electromagnetic waves is placed between the floor panel 70 and the undercover 400, the electromagnetic waves generated by this electrical component are located above the floor panel 70. Electronic devices (for example, radios, electronic clocks, navigation systems, etc.) Etc.) can be avoided.

The shield member 405 provided on the undercover 400 (schematically shown in FIG. 1) is provided on the undercover 400 according to the strength of the electromagnetic wave reaching the battery case 50 from the lower side of the vehicle body 11 and the area covered by the electromagnetic wave. It may be provided only in a part. Further, when the electromagnetic wave is weak enough to cause no problem in practical use, it is not necessary to provide the shield member 405 on the undercover 400.

As shown in FIGS. 2, 5, and 6, the frame structure 30 is provided with protector members 410 and 411 that function as battery unit protection means. In the present embodiment, the protector members 410,411 and the undercover 400 constitute a battery unit protecting means.

The protector members 410 and 411 are attached to the lower surfaces of the side members 31 and 32 by bolts 412. The protector members 410 and 411 are attached to the front portion of the side members 31, 32, that is, a portion where the width between the side members 31 and 32 narrows toward the front wheel 20. Therefore, the protector members 410 and 411 are located inside the pair of left and right front wheels when viewed from the front of the vehicle body 11. Moreover, the undercover 400 is connected behind the protector members 410 and 411.

Inclined surfaces 410a, 411a are formed on the front portion of the protector members 410, 411. These inclined surfaces 410a and 411a are shaped like a "sled" that is inclined so as to increase from the rear side to the front side of the side members 31 and 32. The convex portion of the road surface that collides with the protector members 410,411 from the front side of the vehicle body 11 during traveling is guided to the rear of the protector members 410,411 along the inclined surfaces 410a, 411a.

The inclined surfaces 410a and 411a are located on the front side of the front end 50a of the battery case 50. The lower surfaces of the protector members 410 and 411 project below the side members 31 and 32. The lower surfaces of the protector members 410 and 411 are located below the lower surface of the front end 50a of the battery case 50. The lower surfaces of the protector members 410 and 411 project downward from the lower surface of the undercover 400.

In this way, the pair of left and right protector members 410,411 are fixed to the highly rigid side members 31,32. Further, a highly rigid girder member 101, 102, 103, 104 is arranged on the undercover 400 behind the protector members 410,411.

When the automobile 10 tries to pass through a large convex portion such as a step, it is assumed that the convex portion of the road surface hits the vicinity of the tip 400c of the undercover 400, for example, depending on the situation. In that case, the cross member 33a arranged near the tip 400c of the undercover 400 receives the load of the collision, and the convex portion of the road surface is guided to the rear side of the vehicle body 11 along the undercover 400. Therefore, it is possible to prevent the convex portion of the road surface from hitting the battery unit 14.

Depending on the driving situation, it is assumed that the convex portion of the road surface collides with at least one of the protector members 410 and 411. In that case, the inclined surfaces 410a, 411a of the protector members 410, 411 ride on the convex portion of the road surface and head toward the rear of the vehicle body 11. In this case, the inclined surfaces 410a, 411a of the protector members 410, 411 perform a function corresponding to a "sled", so that the convex portion of the road surface that hits the inclined surfaces 410a, 411a is guided toward the undercover 400. Therefore, it is possible to prevent the convex portion of the road surface from directly hitting the battery unit 14.

Highly rigid girder members 101, 102, 103, 104 are lined up on the undercover 400 from the front to the rear of the vehicle body 11. These girder members 101, 102, 103, 104 are arranged behind the protector members 410, 411. Therefore, the undercover 400 can exert great strength against an external force input from the lower side. Therefore, the convex portion of the road surface in contact with the undercover 400 can be guided to the rear of the vehicle body 11 along the undercover 400. In this way, damage to the battery unit 14 can be prevented. The undercover 400 also has the effect of rectifying the air flow generated on the lower surface side of the vehicle body 11 during traveling, and can reduce the air resistance during traveling.

In the electric vehicle 10 of the present embodiment, the battery unit 14 is arranged below the metal floor panel 70. This floor panel 70 functions as an upper electromagnetic shield portion. The battery unit 14 is arranged between the left and right metal side members 31 and 32. That is, steel side members 31 and 32 having an effect of shielding electromagnetic waves are arranged on the left and right sides of the electric circuit storage portion 58. These side members 31 and 32 function as electromagnetic shields on both the left and right sides of the battery unit 14. In addition, the cross members 33, 34, 35 can also function as electromagnetic shields.

Moreover, below the battery case 50, there are metal girder members 101, 102, 103, 104 that function as a lower electromagnetic shield portion. Further, the front and rear metal plates 200a and 200b of the insert member 200 embedded in the resin constituting the battery case 50 function as a front electromagnetic shield portion and a rear electromagnetic shield portion, respectively.

Further below the battery case 50, there is an undercover 400 with electromagnetic shield measures such as a shield member 405. When metal girder members 101 to 104 are present above the undercover 400, the girder members 101 to 104 exert an electromagnetic shielding effect, so that the electromagnetic shielding measures provided on the undercover 400 can be reduced or omitted. is there. That is, the shield member 405 may not be provided at a position overlapping the girder members 101 to 104 when viewed from above the vehicle body 11.

By providing the electromagnetic wave shielding means described above, it is possible to prevent the electric component 61 inside the battery case 50 from being affected by the electromagnetic wave without applying the electromagnetic wave shielding paint to the battery case 50. Further, even if an electromagnetic wave is generated inside the battery case 50, it is possible to prevent the electromagnetic wave from being emitted to the outside of the battery case 50. According to the electromagnetic shield portion of the present embodiment, it is not necessary to arrange the conductive member for the electromagnetic shield on the inner surface of the battery case 50 in an exposed state, so that the conductive member for the electromagnetic shield does not cause a short circuit and is safe. is there.

Although the electric vehicle in which the traveling motor is mounted on the rear portion of the vehicle body has been described in the above embodiment, the present invention can also be applied to the electric vehicle in which the traveling motor is arranged on the front portion of the vehicle body. Further, in carrying out the present invention, the structure and arrangement of the constituent elements of the present invention, including the side member, the floor panel, the motor, the battery unit, the front electromagnetic shield portion, the rear electromagnetic shield portion, and the lower electromagnetic shield portion, are appropriately arranged. Needless to say, it can be changed to.

<figref num="1">FIG. 3 is a perspective view of an electric vehicle, a battery unit, and an undercover according to an embodiment of the present invention.</figref><figref num="2">The perspective view of the frame structure and the battery unit of the electric vehicle shown in FIG.</figref><figref num="3">A perspective view of the battery case and girder member of the battery unit shown in FIG.</figref><figref num="4">Side view of the frame structure and battery unit of the electric vehicle shown in FIG.</figref><figref num="5">Top view of the frame structure and battery unit of the electric vehicle shown in FIG. 1.</figref><figref num="6">A perspective view of the frame structure and undercover of the electric vehicle shown in FIG. 1 as viewed from below.</figref><figref num="7">The perspective view of the insert member embedded in the tray member of the battery case shown in FIG.</figref>

Code description

10 ... electric car 11 ... Body 14 ... Battery unit 30 ... frame structure 31,32 ... Side members 50 ... Battery case 70 ... floor panel 101,102,103,104 ... Girder member (lower electromagnetic shield) 200 ... insert member 200a, 200b, 200c ... Metal plate (front electromagnetic shield) 200d, 200e, 200f ... Metal plate (rear electromagnetic shield) 400 ... undercover 405 ... Shield member (lower electromagnetic shield)