JP2021030966A - Exhaust flow passage structure - Google Patents

Abstract

To provide an exhaust flow passage structure capable of reducing costs of a cooling component of a power storage device.SOLUTION: An exhaust flow passage structure is an exhaust flow passage structure of cooling exhaust air of a power storage device 2 disposed in a cabin C of an electric vehicle 1 and includes: a rear cross member 23 which partitions the cabin C from a cargo chamber L and extends in a vehicle width direction; an exhaust space defined by at least the rear cross member 23; and an exhaust duct 50 which guides exhaust air from the power storage device 2. The exhaust duct 50 is connected to the exhaust space.SELECTED DRAWING: Figure 1

Description

The present invention relates to an exhaust flow path structure.

Conventionally, an electric vehicle such as a hybrid vehicle is equipped with a power storage device including a battery module and a control device housed in a case. The battery module and control device are heating elements, and the performance of the battery may deteriorate in a high temperature environment. Therefore, a structure has been proposed in which air is introduced from the cabin into the power storage device to cool the battery module and the control device (see, for example, Patent Document 1).

By the way, an exhaust duct for guiding cooling air exhausted from the power storage device (hereinafter referred to as cooling exhaust air of the power storage device) is connected to the power storage device. In the cooling structure described in Patent Document 1, the exhaust duct extending from the power storage device extends rearward along the wheel house from the side of the seat back of the rear seat, and can be exhausted between the vehicle body and the trunk side lining behind the wheel house. Is formed in.

Japanese Unexamined Patent Publication No. 2015-209116

However, in a vehicle whose specifications have been determined as a gasoline vehicle, the space for arranging the exhaust duct connected to the power storage device is not considered. Therefore, if the body parts and interior parts are shared between the electric vehicle and the gasoline vehicle, it may be necessary to arrange the exhaust duct in the vacant space. As a result, the exhaust duct becomes long, and the cost of the cooling component of the power storage device may increase.

Therefore, the present invention provides an exhaust flow path structure capable of reducing the cost of cooling components of a power storage device.

The exhaust flow path structure of the present invention is the power storage device (for example, the power storage device 2 in the embodiment) arranged in the cabin (for example, the cabin C in the embodiment) of the electric vehicle (for example, the electric vehicle 1 in the embodiment). A cross member (for example, the rear cross member 23 in the embodiment) that is an exhaust flow path structure for cooling exhaust air and that separates the cabin from the luggage compartment (for example, the luggage compartment L in the embodiment) and extends in the vehicle width direction. And at least an exhaust space defined by the cross member (for example, the exhaust space E in the embodiment) and an exhaust duct for guiding the exhaust air from the power storage device (for example, the exhaust duct 50 in the embodiment). The exhaust duct is connected to the exhaust space.

According to the present invention, since the cooling exhaust air of the power storage device can be discharged into the vehicle interior by using the cross member which is a part of the body, the length of the exhaust duct can be shortened. Therefore, the cost of the cooling component of the power storage device can be reduced. Further, by shortening the length of the exhaust duct, the volume of at least one of the cabin and the luggage compartment can be increased. Further, since the cross member extends in the vehicle width direction, the cooling exhaust air of the power storage device can be discharged to various positions through the exhaust space. Therefore, improvement of air-conditioning commercial value and improvement of exhaust pressure loss can be expected.

The exhaust flow path structure may include an exhaust flow path (for example, the exhaust flow path P in the embodiment) that communicates the exhaust space with the space under the luggage compartment.

According to the present invention, the cooling exhaust air of the power storage device can be discharged into the space under the luggage compartment. Therefore, the discomfort can be suppressed by exhausting the air to a position away from the occupant (particularly the head).

In the exhaust flow path structure, a floor panel (for example, the floor panel 10 in the embodiment) that is arranged below the cross member and defines the exhaust space together with the cross member is provided, and the exhaust flow path is the exhaust flow path. It may be formed in the gap between the cross member and the floor panel.

According to the present invention, since the exhaust flow path is formed in the gap between the cross member which is a part of the body and the floor panel, exhaust can be performed without adding a new duct.

In the exhaust flow path structure, the exhaust flow path is formed on the lower surface of the cross member, is recessed upward, and has an upper recess (for example, the upper recess 26 in the embodiment) extending in the front-rear direction of the vehicle, and the floor panel. It may be formed on the upper surface of the vehicle and recessed downward, and may be defined by a lower recess (for example, the lower recess 17 in the embodiment) extending in the front-rear direction at a position facing the upper recess.

According to the present invention, since a gap is formed between the upper recess and the lower recess, the exhaust flow path can be easily formed. Further, as compared with the configuration in which the recess is formed only on one of the lower surface of the cross member and the upper surface of the floor panel, the bending amount of the cross member and the floor panel can be reduced in order to secure the required opening cross-sectional area. The exhaust flow path structure can be easily produced.

In the above exhaust flow path structure, a plurality of the exhaust flow paths may be provided.

According to the present invention, the cooling exhaust air of the power storage device introduced in the exhaust space can be dispersed and discharged in the space under the luggage compartment. Therefore, the wind speed of the exhaust gas in the space under the luggage compartment can be reduced, and the generation of wind noise in the space under the luggage compartment can be suppressed.

In the exhaust flow path structure, a lid (for example, the lid 4 in the embodiment) that closes the space under the luggage compartment from above is provided, and the opening end of the exhaust flow path on the space side under the luggage compartment is the said. It may be covered from above by the lid.

According to the present invention, the lid can regulate the immediate rise of the exhaust gas discharged from the exhaust flow path. Therefore, the cooling exhaust air of the power storage device can be reliably discharged to the space under the luggage compartment.

In the exhaust flow path structure, the upper portion of the opening end of the exhaust flow path on the space side under the luggage compartment may be bent toward the upper portion of the space under the luggage compartment.

According to the present invention, since the cross-sectional area of the flow path in the exhaust flow path increases from the upstream side to the downstream side at the opening end, the wind speed of the exhaust can be reduced at the opening end, and the wind noise in the space under the luggage compartment can be reduced. Occurrence can be suppressed.

In the above exhaust flow path structure, the power storage device may be arranged below the rear seat.

According to the present invention, since the exhaust location from the exhaust flow path and the installation location of the power storage device are different, it is possible to suppress the influence of heat reception on the power storage device due to the exhaust gas.

In the exhaust flow path structure, a patch (for example, patch 28 in the embodiment) that is arranged inside the cross member and suppresses the upward flow of the exhaust air from the power storage device may be provided.

According to the present invention, it is possible to suppress an increase in exhaust air in the cross member. Thereby, for example, in a configuration in which the cross member extends upward and opens on the side portion in the vehicle width direction, it is possible to suppress the cooling exhaust air of the power storage device from being discharged near the head of the occupant. Therefore, discomfort can be suppressed.

According to the present invention, it is possible to provide an exhaust flow path structure capable of reducing the cost of cooling components of a power storage device.

It is a perspective view which looked at the body of the electric vehicle of embodiment from the front. It is a perspective view which looked at the body of the electric vehicle of embodiment from the rear. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is a perspective view which shows the IV part of FIG. 1 enlarged. It is sectional drawing in the VV line of FIG. It is a figure which shows the flow of the cooling exhaust air in the exhaust flow path structure of an embodiment. It is a figure which shows the flow of the cooling exhaust air in the exhaust flow path structure of an embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. Then, the duplicate description of those configurations may be omitted. Further, the directions such as front-rear, up-down, left-right, etc. in the following description are the same as the directions in the vehicle described below. That is, the vertical direction coincides with the vertical direction, and the horizontal direction coincides with the vehicle width direction. Further, in the drawings used in the following description, the arrow UP indicates the upper side, the arrow FR indicates the front side, and the arrow LH indicates the left side.

FIG. 1 is a perspective view of the vehicle body of the electric vehicle of the embodiment as viewed from the front. FIG. 2 is a perspective view of the vehicle body of the electric vehicle of the embodiment as viewed from the rear. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. Note that the lid 4 is not shown in FIG.
As shown in FIGS. 1 to 3, in the electric vehicle 1 of the embodiment, the power storage device 2 arranged in the cabin C and the cooling exhaust air of the power storage device 2 are supplied to the space S (under the luggage compartment) in the tire accommodating portion 15. The exhaust flow path structure that leads to the space) is provided. The exhaust flow path structure includes a rear cross member 23 extending in the vehicle width direction, a floor panel 10 arranged below the rear cross member 23, and an exhaust space E defined by the rear cross member 23 and the floor panel 10. The lid 4 that closes the space S in the tire accommodating portion 15 from above, the exhaust flow path P that communicates the exhaust space E and the space S in the tire accommodating portion 15, and the cooling exhaust air of the power storage device 2 are exhausted in the exhaust space E. It is provided with an exhaust duct 50 leading to the exhaust space E and a patch 28 for regulating the flow of air in the exhaust space E. Hereinafter, the cooling exhaust air of the power storage device 2 may be simply referred to as a cooling exhaust air.

As shown in FIG. 1, the power storage device 2 is used as a power source for the electric vehicle 1. The power storage device 2 has a case 2a, a battery module and a PCU housed in the case 2a. The case 2a is formed in a rectangular parallelepiped shape and is arranged on the floor panel 10. The battery module includes a plurality of battery cells. The PCU includes, for example, an inverter, a DC-DC converter, an ECU, and the like.

The rear cross member 23 and the floor panel 10 are included in the body 3 of the electric vehicle 1. The body 3 of the electric vehicle 1 includes left and right rear frames 19 and a rear wheel house 21 in addition to the rear cross member 23 and the floor panel 10.

The floor panel 10 includes a rear floor panel 11 located below the rear seat (not shown) and a spare tire pan 14 located behind the rear floor panel 11. The rear floor panel 11 is formed with an accommodating portion 12 for accommodating the power storage device 2. The accommodating portion 12 is formed so that the upper surface of the rear floor panel 11 is recessed downward. The rear floor panel 11 is joined to a front floor panel (not shown) at the front end portion.

As shown in FIG. 2, the spare tire pan 14 is joined to the rear end edge of the rear floor panel 11. Specifically, the front end portion of the spare tire pan 14 is joined to the rear end portion of the rear floor panel 11 so as to overlap from above at the joint portion with the rear floor panel 11. A tire accommodating portion 15 for accommodating a spare tire is formed in the central portion of the spare tire pan 14. The tire accommodating portion 15 is formed so that the upper surface of the spare tire pan 14 is recessed downward. The space S in the tire accommodating portion 15 is closed from above by the removable lid 4 (see FIG. 1). The upper part of the lid 4 is the luggage compartment L.

As shown in FIG. 1, the rear frame 19 extends in the front-rear direction on both sides of the rear portion of the vehicle. For example, the rear frame 19 is formed in a hollow shape by bending the side portion of the floor panel 10 in the vehicle width direction in a crank shape and joining an outer member (not shown) to the bent side portion from below. ..

The rear wheel house 21 defines the rear wheel tire house. The rear wheel house 21 projects upward from the rear floor panel 11. The rear wheel house 21 is arranged over both the cabin C and the luggage compartment L. The rear wheel house 21 is joined to the side edge of the rear floor panel 11 in the vehicle width direction on the outer side of the rear frame 19 in the vehicle width direction. In the luggage compartment L, the spare tire pan 14 overlaps the rear wheel house 21 from the inside in the vehicle width direction. (See Fig. 2)

The rear cross member 23 is connected to the left and right rear frames 19. The rear cross member 23 is arranged in front of the joint portion between the rear floor panel 11 and the spare tire pan 14. The rear cross member 23 projects upward from the upper surface of the floor panel 10 between the left and right rear wheel houses 21 to partition the cabin C and the luggage compartment L. The rear cross member 23 includes a main body portion 30 extending in the vehicle width direction at least between the left and right rear frames 19, and gussets 40 rising from both ends of the main body portion 30.

As shown in FIG. 3, the main body 30 is formed in a U-shape in cross section. Specifically, the main body portion 30 includes an upper wall 31, a front wall 32, a rear wall 33, a front flange 34, and a rear flange 35. The upper wall 31 forms the upper part of the main body portion 30. The upper wall 31 is located above the rear floor panel 11. The upper wall 31 extends substantially horizontally. The front wall 32 extends downward and forward from the entire front edge of the upper wall 31. The entire lower end edge of the front wall 32 is close to the upper surface of the rear floor panel 11. The rear wall 33 extends downward and rearward from the entire trailing edge of the upper wall 31. The entire lower edge of the rear wall 33 is close to the upper surface of the rear floor panel 11. The front flange 34 projects forward from the lower end edge of the front wall 32 along the upper surface of the rear floor panel 11. The front flange 34 is airtightly joined to the upper surface of the rear floor panel 11. The rear flange 35 projects rearward from the lower end edge of the rear wall 33 along the upper surface of the rear floor panel 11. The rear flange 35 is joined to the upper surface of the rear floor panel 11 while avoiding the lower recess 17 and the upper recess 26 described later. At least the rear end of the rear flange 35 is covered from above by the lid 4.

As shown in FIG. 1, the pair of gussets 40 are joined to both ends of the main body 30 in the vehicle width direction. Specifically, each gusset 40 is joined to the end portion of the main body portion 30 so as to overlap from the outside at the joint portion with the main body portion 30. The pair of gussets 40 extend across the rear frame 19 so as to extend the main body 30. The pair of gussets 40 extend outward in the vehicle width direction from the joint with the main body 30, and further extend upward along the rear wheel house 21.

As shown in FIGS. 1 and 2, each gusset 40 is formed in a U-shape in cross section. Specifically, each gusset 40 includes a front and rear wall 41, a front upper and lower wall 42, and a rear upper and lower wall 43. The front and rear walls 41 are joined to the upper wall 31 of the main body portion 30. The front and rear walls 41 extend outward and upward in the vehicle width direction from the joint with the upper wall 31, and then extend upward in a state of being spaced apart from the rear wheel house 21 in the vehicle width direction. The entire front and rear walls 41 extend in the front-rear direction. The front upper and lower walls 42 are joined to the front wall 32 of the main body 30. The front upper and lower walls 42 extend downward from the front edge of the front and rear walls 41 and outward in the vehicle width direction. The entire lower end edge of the front upper and lower walls 42 is airtightly joined to the upper surface of the rear floor panel 11. The outer edge of the front upper and lower walls 42 in the vehicle width direction is airtightly joined to the side surface of the rear wheel house 21 facing inward in the vehicle width direction. The rear upper and lower walls 43 are joined to the rear wall 33 of the main body portion 30. The rear upper and lower walls 43 extend downward from the rear edge of the front and rear walls 41 and outward in the vehicle width direction. The entire lower end edge of the rear upper and lower walls 43 is close to the upper surface of the rear floor panel 11 and is connected to the spare tire pan 14. The outer edge of the rear upper and lower walls 43 in the vehicle width direction is close to the side surface of the rear wheel house 21 facing inward in the vehicle width direction and is connected to the spare tire pan 14.

The rear cross member 23 formed by the main body 30 and the pair of gussets 40 has a U-shaped cross section that opens downward and outward in the vehicle width direction as a whole and is closed by the floor panel 10 and the rear wheel house 21. Has been done. At least a part of the space defined by the rear cross member 23 is an exhaust space E (see FIG. 3). In the present embodiment, the exhaust space E is a space defined by the rear cross member 23 and the floor panel 10. The space defined by the rear cross member 23 and the rear wheel house 21 communicates with the space where the seatbelt retractor for the rear seat is installed through the upper end portion of the gusset 40.

FIG. 4 is an enlarged perspective view showing the IV portion of FIG. 1. Note that FIG. 4 shows a state in which the exhaust duct 50 is removed.
As shown in FIG. 4, the rear cross member 23 is formed with an opening 24 to which the exhaust duct 50 is connected. The opening 24 communicates the outside of the rear cross member 23 with the exhaust space E. The opening 24 is open forward. The opening 24 is formed at the end of the rear cross member 23 in the vehicle width direction. In this embodiment, the opening 24 is formed in the gusset 40 above the rear frame 19 on the right side. The opening 24 is formed in a rectangular shape with the longitudinal direction along the vertical direction when viewed from the front so as to extend along the rear wheel house 21.

FIG. 5 is a cross-sectional view taken along the line VV of FIG.
As shown in FIGS. 2 and 5, the exhaust flow path P is formed in the gap between the rear cross member 23 and the floor panel 10. Specifically, the exhaust flow path P is formed in the gap between the rear flange 35 of the main body 30 of the rear cross member 23 and the rear floor panel 11. The exhaust flow path P is defined by an upper recess 26 formed on the lower surface of the rear cross member 23 and a lower recess 17 formed on the upper surface of the floor panel 10.

A plurality of upper recesses 26 are provided on the lower surface of the rear flange 35. Each upper recess 26 extends in the front-rear direction. The plurality of upper recesses 26 are arranged in the vehicle width direction. The front end of each upper recess 26 is open forward. As a result, the inside of each upper recess 26 communicates with the exhaust space E (see also FIG. 3). The rear end of each upper recess 26 is open rearward. Since the lid 4 overlaps the rear end portion of the rear flange 35 from above, the inside of each upper recess 26 communicates with the space S in the tire accommodating portion 15 of the spare tire pan 14. The depths of the plurality of upper recesses 26 coincide with each other.

The number of lower recesses 17 is provided on the upper surface of the floor panel 10 in the same number as the number of upper recesses 26. Each lower recess 17 extends in the front-rear direction. The plurality of lower recesses 17 are formed in at least a region of the upper surface of the floor panel 10 facing the rear flange 35. In the present embodiment, the plurality of lower recesses 17 are formed on the upper surface of the rear floor panel 11. The plurality of lower recesses 17 are formed at the same positions as the plurality of upper recesses 26 in the vehicle width direction. The front end of each lower recess 17 is open forward. As a result, the inside of each lower recess 17 communicates with the exhaust space E (see also FIG. 3). Each lower recess 17 extends rearward from the opposite upper recess 26. The inside of each lower recess 17 communicates with the space S in the tire accommodating portion 15 of the spare tire pan 14. The depths of the plurality of lower recesses 17 coincide with each other, for example, the depths of the upper recess 26.

A plurality of exhaust flow paths P defined by the upper recess 26 and the lower recess 17 are provided and arranged in the vehicle width direction. The dimensions of the exhaust flow path P in the vehicle width direction do not have to be the same for all the exhaust flow paths P, and are appropriately set for each exhaust flow path P. All the exhaust flow paths P are arranged closer to the center of the vehicle width than the opening 24 in the vehicle width direction.

As shown in FIG. 3, the upper portion of the opening end (rear end) on the space S side in the tire accommodating portion 15 in the exhaust flow path P is bent toward the upper portion of the space S in the tire accommodating portion 15. Specifically, the rear end portion of the rear flange 35 of the main body portion 30 of the rear cross member 23 is bent rearward and upward so as to be separated from the upper surface of the rear floor panel 11. As a result, the cross-sectional area of the exhaust flow path P gradually increases from the upstream side to the downstream side at the opening end (rear end) on the space S side in the tire accommodating portion 15.

As shown in FIG. 1, the exhaust duct 50 is connected to the case 2a of the power storage device 2. Cooling exhaust air flows through the exhaust duct 50. The exhaust duct 50 extends below the rear seats from the upper surface of the case 2a. The exhaust duct 50 extends from the end (right end in this embodiment) of the case 2a on the same side as the opening 24 (see FIG. 4) of the rear cross member 23 with respect to the vehicle width center of the electric vehicle 1. .. The exhaust duct 50 passes above the rear frame 19 and extends rearward. The rear end of the exhaust duct 50 is connected to the opening 24 of the rear cross member 23. The rear end portion of the exhaust duct 50 may be formed so as to open inward in the vehicle width direction inside the rear cross member 23.

The patch 28 is arranged inside the rear cross member 23. The patch 28 is arranged on the side opposite to the exhaust flow path P with respect to the opening 24. The patch 28 is arranged so as to fill the space between the rear cross member 23 and the rear wheel house 21 on the upper end side of the gusset 40 with respect to the opening 24 of the rear cross member 23. As a result, the patch 28 defines an upstream end portion in the exhaust space E.

Next, the operation of the exhaust flow path structure having the above configuration will be described with reference to FIGS. 6 and 7.
The air that has cooled the battery module or the like in the case 2a of the power storage device 2 is discharged into the exhaust duct 50 as cooling exhaust by a blower fan or the like (not shown). The cooling exhaust air discharged to the exhaust duct 50 is guided to the exhaust space E through the opening 24 (see FIG. 4) of the rear cross member 23.

Here, all the exhaust flow paths P communicating with the exhaust space E are arranged closer to the center of the vehicle width than the opening 24. Further, the patch 28 is arranged on the upper end side of the gusset 40 with respect to the opening 24. Therefore, the cooling exhaust air that has flowed into the exhaust space E from the opening 24 is suppressed from flowing upward by the patch 28, and flows inward in the vehicle width direction toward the plurality of exhaust flow paths P. Then, the cooling exhaust air in the exhaust space E is discharged to the space S in the tire accommodating portion 15 through the plurality of exhaust flow paths P.

As described above, the exhaust flow path structure of the present embodiment is the exhaust flow path structure of the cooling exhaust air of the power storage device 2 arranged in the cabin C of the electric vehicle 1, and is the exhaust flow path structure of the cabin C and the luggage compartment L. A rear cross member 23 extending in the vehicle width direction, an exhaust space E defined by the rear cross member 23 and the floor panel 10, and an exhaust duct 50 for guiding exhaust air from the power storage device 2 are provided. .. The exhaust duct 50 is connected to the exhaust space E.
According to this configuration, since the cooling exhaust air of the power storage device 2 can be discharged into the vehicle interior by using the rear cross member 23 which is a part of the body 3, the length of the exhaust duct 50 can be shortened. Therefore, the cost of the cooling component of the power storage device 2 can be reduced. Further, by shortening the length of the exhaust duct 50, the volume of at least one of the cabin C and the luggage compartment L can be increased. Further, since the rear cross member 23 extends in the vehicle width direction, the cooling exhaust air of the power storage device 2 can be discharged to various positions through the exhaust space E. Therefore, improvement of air-conditioning commercial value and improvement of exhaust pressure loss can be expected.

Further, the exhaust flow path structure includes an exhaust flow path P that communicates the exhaust space E with the space S (space under the luggage compartment) in the tire accommodating portion 15.
According to this configuration, the cooling exhaust air of the power storage device 2 can be discharged to the space S in the tire accommodating portion 15. Therefore, the discomfort can be suppressed by exhausting the air to a position away from the occupant (particularly the head).

Further, the exhaust flow path structure is arranged below the rear cross member 23, and includes a floor panel 10 that defines the exhaust space E together with the rear cross member 23. The exhaust flow path P is formed in the gap between the rear cross member 23 and the floor panel 10.
According to this configuration, the exhaust flow path P is formed in the gap between the rear cross member 23, which is a part of the body, and the floor panel 10, so that exhaust can be performed without adding a new duct.

Further, the exhaust flow path P is formed on the lower surface of the rear cross member 23 and is recessed upward and extends in the front-rear direction, and the exhaust flow path P is formed on the upper surface of the floor panel 10 and is recessed downward and faces the upper recess 26. It is defined by a lower recess 17 extending in the front-rear direction at the position where it is to be.
According to this configuration, since a gap is formed between the upper recess 26 and the lower recess 17, the exhaust flow path P can be easily formed. Further, as compared with the configuration in which the recess is formed only on one of the lower surface of the rear cross member and the upper surface of the floor panel, the bending amount of the rear cross member 23 and the floor panel 10 is increased in order to secure the required opening cross-sectional area. Since it can be made smaller, the exhaust flow path structure can be easily produced.

Further, since a plurality of exhaust flow paths P are provided, the cooling exhaust air of the power storage device 2 introduced in the exhaust space E can be dispersed and exhausted in the space S in the tire accommodating portion 15. Therefore, the wind speed of the exhaust gas in the space S in the tire accommodating portion 15 can be reduced, and the generation of wind noise in the space S in the tire accommodating portion 15 can be suppressed. Further, the load related to the gap between the rear cross member 23 and the floor panel 10 is dispersed in the plurality of exhaust flow paths P, and the gap can be prevented from being blocked.

Further, the exhaust flow path structure includes a lid 4 that closes the space S in the tire accommodating portion 15 from above. The open end on the space S side in the tire accommodating portion 15 in the exhaust flow path P is covered from above by the lid 4.
According to this configuration, the lid 4 can regulate that the exhaust gas discharged from the exhaust flow path P rises immediately. Therefore, the cooling exhaust air of the power storage device 2 can be reliably discharged to the space S in the tire accommodating portion 15.

Further, the upper portion of the opening end on the space S side in the tire accommodating portion 15 in the exhaust flow path P is bent toward the upper portion of the space S in the tire accommodating portion 15.
According to this configuration, the cross-sectional area of the flow path in the exhaust flow path P increases from the upstream side to the downstream side at the opening end. Therefore, the wind speed of the exhaust gas can be reduced at the opening end, and the generation of wind noise in the space S in the tire accommodating portion 15 can be suppressed.

Further, the power storage device 2 is arranged below the rear seat.
According to this configuration, since the exhaust location from the exhaust flow path P and the installation location of the power storage device 2 are different, it is possible to suppress the influence of heat reception on the power storage device 2 by the exhaust gas.

Further, the exhaust flow path structure is arranged inside the rear cross member 23, and includes a patch 28 that suppresses the upward flow of the exhaust air from the power storage device 2.
According to this configuration, it is possible to suppress an increase in exhaust air in the rear cross member 23. Thereby, for example, in a configuration in which the rear cross member extends upward and opens on the side portion in the vehicle width direction, it is possible to suppress the cooling exhaust air of the power storage device 2 from being discharged near the head of the occupant. Therefore, discomfort can be suppressed.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in the above embodiment, the opening 24 is formed at the end of the rear cross member 23 in the vehicle width direction, and the exhaust duct 50 extends from the end of the case 2a of the power storage device 2 on the same side as the opening 24. It is out. However, the positions of the openings of the rear cross member and the exhaust duct are not limited to this. For example, an opening may be formed in the middle portion of the rear cross member in the vehicle width direction, and the exhaust duct may extend from the case of the power storage device at the same position as the opening in the vehicle width direction.

Further, in the above embodiment, the exhaust space E is defined by the rear cross member 23 and the floor panel 10. However, the configuration of the exhaust space is not limited to this. For example, the rear cross member may have a closed cross-sectional structure by itself, and the exhaust space may be defined only by the rear cross member.

Further, in the above embodiment, the exhaust flow path P is defined by the upper recess 26 of the rear cross member 23 and the lower recess 17 of the rear floor panel 11, but the present invention is not limited to this. The exhaust flow path may be defined by the upper recess 26 of the rear cross member 23 and the flat upper surface of the rear floor panel, or by the flat lower surface of the rear cross member and the lower recess 17 of the rear floor panel 11. It may have been.

Further, in the above embodiment, the exhaust space E is defined by the rear cross member 23, but the same effect can be obtained by using, for example, a closed space formed of the sheet metal of the vehicle body as the exhaust space. ..

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention.

1 ... Electric vehicle 2 ... Power storage device 4 ... Lid 10 ... Floor panel 17 ... Lower recess 23 ... Rear cross member (cross member) 26 ... Upper recess 28 ... Patch 50 ... Exhaust duct C ... Cabin E ... Exhaust space L ... Luggage compartment P ... Exhaust flow path S ... Space (space under the luggage compartment)

Claims (9)

It is an exhaust flow path structure for the cooling exhaust of the power storage device arranged in the cabin of the electric vehicle.
A cross member that separates the cabin from the luggage compartment and extends in the vehicle width direction,
At least the exhaust space defined by the cross member,
An exhaust duct that guides the exhaust air from the power storage device,
With
The exhaust duct is connected to the exhaust space.
The exhaust flow path structure is characterized by this. An exhaust flow path for communicating the exhaust space and the space under the luggage compartment is provided.
The exhaust flow path structure according to claim 1. A floor panel arranged below the cross member and defining the exhaust space together with the cross member is provided.
The exhaust flow path is formed in a gap between the cross member and the floor panel.
2. The exhaust flow path structure according to claim 2. The exhaust flow path is
An upper recess formed on the lower surface of the cross member and recessed upward and extending in the front-rear direction of the vehicle,
A lower recess formed on the upper surface of the floor panel and recessed downward, and a lower recess extending in the front-rear direction at a position facing the upper recess.
Is defined by,
The exhaust flow path structure according to claim 3, wherein the exhaust flow path structure is characterized by this. A plurality of the exhaust flow paths are provided.
The exhaust flow path structure according to any one of claims 2 to 4, wherein the exhaust flow path structure is characterized in that. A lid that closes the space under the luggage compartment from above is provided.
The space-side opening end under the luggage compartment in the exhaust flow path is covered from above by the lid.
The exhaust flow path structure according to any one of claims 2 to 5, wherein the exhaust flow path structure is characterized in that. The upper part of the space-side opening end under the luggage compartment in the exhaust flow path is bent toward the upper part of the space under the luggage compartment.
The exhaust flow path structure according to any one of claims 2 to 6, wherein the exhaust flow path structure is characterized in that. The power storage device is located below the rear seats.
The exhaust flow path structure according to any one of claims 1 to 7, wherein the exhaust flow path structure is characterized in that. A patch that is arranged inside the cross member and that suppresses the upward flow of the exhaust air from the power storage device is provided.
The exhaust flow path structure according to any one of claims 1 to 8, wherein the exhaust flow path structure is characterized in that.

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