JP7508813B2 - Battery pack - Google Patents

Description

The present invention relates to a battery pack.

Vehicles such as automobiles may be equipped with a battery pack that includes multiple battery modules, and the power of this battery pack may be supplied to a motor for driving. A conventional battery pack is described in Patent Document 1. The battery pack described in Patent Document 1 ensures both a crushable stroke in the event of a side collision and sufficient battery capacity by arranging a portion of at least one of the intake duct and exhaust duct at the end of the battery pack in the vehicle width direction.

JP 2013-067335 A

However, in the battery pack described in Patent Document 1, if the duct is manufactured as a long, integrated structure, there is a risk that the workability of assembling the duct into the battery case may decrease. On the other hand, if the duct is a split structure, there is a risk that the connection between the split ducts may come loose due to vehicle vibrations, etc.

The present invention was made in light of the above-mentioned circumstances, and aims to provide a battery pack that can improve the workability of assembling an air duct to a battery case and prevent the connections between the ducts from coming loose.

The present invention relates to a battery pack including a battery module, an air supply duct that supplies air to the battery module, and a battery case that houses the battery module and the air supply duct, the air supply duct having a side duct extending in a vehicle front-rear direction between the battery module and the battery case, a vehicle body mount portion for mounting the battery case to a vehicle body and a duct support portion for supporting the side duct are provided on a side wall of the battery case, and a duct attachment portion connected to the duct support portion is provided on the side duct,
The side duct comprises a first duct having a first opening at its downstream end, and a second duct having a second opening at its upstream end and connected to the first duct so that the first opening and the second opening are opposed to each other in the vehicle width direction and communicate with each other, and is characterized in that the first opening and the second opening are connected in a state of being opposed to each other in the vehicle width direction and communicate with each other, and the first opening, the second opening and the duct mounting portion are arranged to overlap the vehicle body mount portion in the vehicle width direction.

In this way, the present invention can provide a battery pack that can improve the workability of assembling the air duct to the battery case and prevent the connections between the ducts from coming loose.

FIG. 1 is a bottom view of a floor panel and a battery pack of a vehicle equipped with a battery pack according to an embodiment of the present invention. FIG. 2 is an enlarged plan view of the dashed line portion of FIG. 3 is a cross-sectional view of the battery pack shown in FIG. 2 taken along the line III-III. 4 is a cross-sectional view taken along the line IV-IV of the battery pack shown in FIG. 2. FIG. 5 is a cross-sectional view taken along the line VV of the battery pack shown in FIG. 2. FIG. 6 is a cross-sectional view taken along the line VI-VI of the battery pack shown in FIG. FIG. 7 is a left side view of a battery pack according to one embodiment of the present invention. 8 is a cross-sectional view of the battery pack shown in FIG. 7 taken along the line IIX-IIX. 9 is a cross-sectional view taken along the line IX-IX of the battery pack shown in FIG. 2. FIG. FIG. 10 is an enlarged view of the first duct and the second duct in the cross-sectional view taken along the arrows in FIG.

A battery pack according to one embodiment of the present invention includes a battery module, an air duct that sends air to the battery module, and a battery case that houses the battery module and the air duct. The air duct has a side duct that extends in the front-rear direction of the vehicle between the battery module and the battery case. A vehicle body mount for attaching the battery case to the vehicle body and a duct support for supporting the side duct are provided on the side wall of the battery case. A duct attachment part connected to the duct support part is provided on the side duct. The side duct includes a first duct having a first opening at its downstream end and a second duct having a second opening at its upstream end and connected to the first duct so that the first opening and the second opening are in communication with each other. The first opening, the second opening, and the duct attachment part are arranged to overlap the vehicle body mount part in the vehicle width direction. As a result, the battery pack according to one embodiment of the present invention can improve the workability of assembling the air duct to the battery case, and can suppress the connection part between the ducts from coming loose.

The following describes a battery pack according to an embodiment of the present invention with reference to the drawings. In Figs. 1 to 10, the up, down, front, back, left and right directions refer to the up, down, front, back, left and right directions of the battery pack when installed in a vehicle, the direction perpendicular to the front and back direction of the vehicle is the left and right direction, and the height direction of the battery pack is the up and down direction.

Figures 1 to 10 are diagrams showing a battery pack according to one embodiment of the present invention.

First, the configuration will be described. In FIG. 1, a vehicle 1 has a vehicle body 2. The vehicle body 2 has a pair of left and right side members 11 and a floor panel 2A connected to the pair of side members 11. A floor tunnel 2B extending in the front-rear direction of the vehicle is formed in the center of the floor panel 2A in the vehicle width direction.

A battery pack 20 is disposed under the floor panel 2A. The battery pack 20 supplies power to a motor (not shown) of the vehicle 1. The battery pack 20 is disposed between a pair of side members 11.

2 and 5, the battery pack 20 includes a battery module group 60 consisting of a plurality of battery modules 61 arranged in the vehicle front-rear direction and vehicle width direction, and a blower fan 55 (see FIG. 4) arranged above the rear of the battery module group 60. A battery module 62 (see FIG. 5) having a similar configuration to the battery module 61 is provided behind the battery module group 60. The blower fan 55 is arranged above the battery module 62.

The battery pack 20 also includes an air duct 70 that sends air from the blower fan 55 to the battery module 61, and a battery case 21 that houses the battery module 61, the blower fan 55, and the air duct 70. The air duct 70 is arranged along the outer periphery of the battery module group 60.

In FIG. 3, the battery case 21 is composed of a lower case 40 and an upper case 30. The battery case 21 is integrated by fastening a flange portion 41 formed on the outer edge of the lower case 40 to a flange portion 31 formed on the outer edge of the upper case 30.

Multiple battery modules 61 are fixed to the lower case 40. The lower case 40 covers the bottom and side surfaces of the multiple battery modules 61. The upper case 30 covers the top surfaces of the multiple battery modules 61 while closing the lower case 40 from above.

In FIG. 2, the air supply duct 70 has an upstream duct member 71, an intermediate duct member 72, and a second duct 73.

The upstream duct member 71 is formed in a T-shape overall and is disposed above the rear of the battery module group 60. The upstream duct member 71 is provided with a blower fan connection portion 71A, which extends in the vehicle front-rear direction and is connected at its rear end to the blower fan 55 (see FIG. 4). The upstream duct member 71 has a branch portion 71B, which is provided at the front end of the blower fan connection portion 71A and extends in the vehicle width direction. The branch portion 71B branches out to the left and right in the vehicle width direction and extends along the rear of the battery module group 60.

The intermediate duct member 72 is connected to the downstream end of the branch portion 71B of the upstream duct member 71. The intermediate duct member 72 has a vehicle width direction extension portion 72A that extends toward the outside in the vehicle width direction, a bent portion 72B that bends toward the front of the vehicle at the vehicle width direction end of the vehicle width direction extension portion 72A, and a first duct 72C that extends toward the front of the vehicle from the bent portion 72B. The first duct 72C extends along the gap between the battery module 61 and the battery case 21. The first duct 72C extends forward along the side wall 42 of the battery case 21.

The upstream end of the second duct 73 is connected to the downstream end of the first duct 72C. The second duct 73 is arranged to pass along the side of the battery module group 60 and extends along the gap between the battery module group 60 and the battery case 21.

The downstream end of the second duct 73 (not shown) is disposed inside the battery module group 60 and supplies air to the multiple battery modules 61.

In Figures 2 and 3, the first duct 72C and the second duct 73 form a side duct 75. The side duct 75 extends in the front-rear direction of the vehicle between the battery module 61 and the battery case 21.

A vehicle body mount 22 for mounting the battery case 21 to the vehicle body 2 is provided on the side wall 42 of the battery case 21. A duct support 80B for supporting the side duct 75 is also provided on the side wall 42 of the battery case 21. The duct support 80B extends toward the inside (right) in the vehicle width direction.

The side duct 75 is provided with a duct mounting portion 80A, which is connected to the duct support portion 80B. More specifically, the duct mounting portion 80A is connected to the duct support portion 80B in a fitting manner at the connection portion 80.

In FIG. 4, the first duct 72C has a first opening 72F at its downstream end 72E. The second duct 73 has a second opening 73B at its upstream end and is connected to the first duct 72C so that the first opening 72F and the second opening 73B are in communication with each other. The first opening 72F, the second opening 73B, and the duct attachment portion 80A are arranged to overlap the vehicle body mount portion 22 in the vehicle width direction. In other words, the first opening 72F, the second opening 73B, and the duct attachment portion 80A are arranged in a position facing the vehicle body mount portion 22 in the vehicle width direction.

8, the upstream end (rear end) of the first opening 72F of the first duct 72C is located upstream of the rear end surface 61A of the battery module 61 located further forward of the vehicle than the vehicle width direction extension portion 72A. Therefore, the vehicle width direction extension portion 72A can be arranged closer to the battery module 61 located further forward of the vehicle than the vehicle width direction extension portion 72A, and the first duct 72C can be shortened and the rigidity of the first duct 72C can be increased. As a result, when the worker connects the first duct 72C and the second duct 73, the worker connects the first duct 72C, which is difficult to deform, to the second duct 73 while deforming the vehicle width direction extension portion 72A, so that the worker can stably connect the first duct 72C and the second duct 73. Therefore, the worker's work efficiency can be improved.

In FIG. 8, the first opening 72F and the second opening 73B are formed along the vehicle longitudinal direction. Here, the first opening 72F and the second opening 73B are formed along the vehicle longitudinal direction, meaning that the opening surfaces of the first opening 72F and the second opening 73B are arranged on a plane (vertical plane in this embodiment) extending in the vehicle longitudinal direction. In addition, the first opening 72F of the first duct 72C is formed to face the inside of the vehicle width direction, and the second opening 73B of the second duct 73 is formed to face the outside of the vehicle width direction. Therefore, the first duct 72C and the second duct 73 are connected by moving relatively in the vehicle width direction. In this embodiment, after the process of attaching the battery module 61, the second duct 73, etc. to the battery case 21, the first duct 72C is connected to the second duct 73. In FIG. 2, the first duct 72C is assembled to the second duct 73 from the outside of the vehicle width direction.

2 and 5, the first duct 72C has an inclined portion 72D on the outer surface of the downstream end 72E in the vehicle width direction. The inclined portion 72D is inclined so that it approaches the inner side in the vehicle width direction from the right as it approaches the downstream side. In other words, the inclined portion 72D is inclined so that the dimension in the vehicle width direction becomes smaller as it approaches the downstream side. Here, the inclined portion 72D is the portion in the range from the part where the dimension in the vehicle width direction of the downstream end 72E of the first duct 72C starts to become smaller to the tip end (front end) of the downstream end 72E.

The first duct 72C has a first extension 81A that extends from the inclined portion 72D in the vehicle front-rear direction, and the first extension 81A is connected to the duct mounting portion 80A via the vertical wall portion 80C.

In FIG. 4, the dimension L2 of the first opening 72F in the vehicle front-rear direction is set to be larger than the dimension L1 in the vehicle up-down direction. Note that in FIG. 4, the first opening 72F of the first duct 72C is shown by a virtual line.

In FIG. 2, the air duct 70 has a second extension 82B, which extends from the upstream end 73A of the second duct 73 in the opposite direction to the first extension 81A in the vehicle front-rear direction. Here, the upstream end 73A of the second duct 73 is the end of the second duct 73 that is connected to the downstream end 72E of the first duct 72C.

The air duct 70 has a third extension 81B, which extends from the second duct 73 in the vehicle width direction and overlaps with the first extension 81A in the vehicle up-down direction. The air duct 70 has a fourth extension 82A, which extends from the first duct 72C in the vehicle width direction and overlaps with the second extension 82B in the vehicle up-down direction.

The air duct 70 also includes a first mounting portion 81, which is the connection portion between the first extension portion 81A and the third extension portion 81B, and a second mounting portion 82, which is the connection portion between the second extension portion 82B and the fourth extension portion 82A. When viewed from above the vehicle, an imaginary line L connecting the first mounting portion 81 and the second mounting portion 82 passes through the first opening 72F. In this manner, in this embodiment, the first mounting portion 81 and the second mounting portion 82 are disposed to face each other across the first opening 72F.

2, 3, and 7, the vehicle body mount portion 22 has a pair of vertical wall portions 22B that extend in the vehicle width direction and are connected to the outer surfaces of the side walls 42 of the battery case 21, an upper wall portion 22A that connects the portions of the upper ends of the pair of vertical wall portions 22B that are close to the side walls 42 of the battery case 21, and a connecting vertical wall portion 22C that connects the portions of the upper ends of the pair of vertical wall portions 22B that are far from the side walls 42 of the battery case 21. The duct attachment portion 80A is provided in an area that faces the connecting vertical wall portions 22C in the vehicle width direction and is located between the pair of vertical wall portions 22B in the vehicle front-rear direction.

In FIG. 10, the downstream end 72E of the first duct 72C has a curved portion 72G that curves closer to the first opening 72F as it approaches the lower part of the vehicle, and the first extension portion 81A is connected to the lower end of the curved portion 72G.

In Figures 4 and 5, the first mounting portion 81 and the second mounting portion 82 are located at different positions in the vertical direction of the vehicle. In this embodiment, the second mounting portion 82 is located at the same position in the vertical direction as the position of the upper surface of the second duct 73 as shown in Figure 4, and the first mounting portion 81 is located at the same position in the vertical direction as the position of the lower surface of the first duct 72C as shown in Figure 5.

6 and 7, the first duct 72C has a bent portion 72H that bends from a direction that is inclined so as to approach the lower side of the vehicle toward the downstream side to a direction parallel to the second duct 73. The fourth extension portion 82A extends from the bent portion 72H.

As described above, in the battery pack 20 of this embodiment, the air duct 70 has a side duct 75 extending in the vehicle front-rear direction between the battery module 61 and the battery case 21. The side wall 42 of the battery case 21 is provided with a vehicle body mount 22 for mounting the battery case 21 to the vehicle body, and a duct support 80B for supporting the side duct 75. The side duct 75 is provided with a duct attachment 80A connected to the duct support 80B, and the side duct 75 includes a first duct 72C having a first opening 72F at its downstream end 72E, and a second duct 73 having a second opening 73B at its upstream end and connected to the first duct 72C so that the first opening 72F and the second opening 73B are in communication with each other. The first opening 72F, the second opening 73B, and the duct attachment 80A are arranged to overlap the vehicle body mount 22 in the vehicle width direction.

With this configuration, the side duct 75 of the air supply duct 70 has a divided structure consisting of the first duct 72C and the second duct 73, which improves the workability of installing the side duct 75 on the vehicle body using a work vehicle compared to when the side duct 75 is installed on the vehicle body all at once as an integrated structure.

In addition, since the vehicle body mount section 22 is a section that has high rigidity and can suppress vibration, by arranging the first opening 72F and the duct mounting section 80A so that they overlap with the vehicle body mount section 22 in the vehicle width direction, it is possible to suppress vibration of the duct mounting section 80A that supports the side duct 75, and to suppress the connection between the first duct 72C and the second duct 73 from being released due to vehicle vibration.

As a result, the workability of assembling the air duct 70 to the battery case 21 can be improved, and the connections between the ducts can be prevented from coming loose.

In the battery pack 20 of this embodiment, the first opening 72F is formed along the vehicle front-rear direction and facing inward in the vehicle width direction. The first duct 72C is assembled to the second duct 73 from the outside in the vehicle width direction.

This configuration allows the first duct 72C to be assembled to the second duct 73 from the outside of the battery case 21 in the vehicle width direction, improving the ease of assembly of the first duct 72C compared to, for example, assembling the first duct 72C from the front-rear direction of the vehicle.

In the battery pack 20 of this embodiment, the downstream end 72E of the first duct 72C has an inclined portion 72D on the outer surface in the vehicle width direction that is inclined so as to approach the inner side in the vehicle width direction as it approaches the downstream side. The inclined portion 72D is inclined so that the dimension in the vehicle width direction becomes smaller as it approaches the downstream side. The first duct 72C has a first extension portion 81A that extends from the inclined portion 72D in the vehicle front-rear direction, and this first extension portion 81A is connected to the duct mounting portion 80A.

With this configuration, the base end of the first extension 81A is connected to both the inclined portion 72D of the first duct 72C and the tip end of the downstream end 72E, so that the area of the connection portion of the first extension 81A to the first duct 72C can be enlarged, and the first extension 81A can be firmly connected to the first duct 72C.

In addition, by connecting the first extension portion 81A to the duct mounting portion 80A, which is supported by the battery case 21 and therefore is less susceptible to vibration, the vibration of the first duct 72C can be suppressed, and the connection between the first duct 72C and the second duct 73 can be prevented from being released due to vibration.

In addition, because the first duct 72C has the inclined portion 72D, the air flowing through the first duct 72C can be guided by the inner surface of the inclined portion 72D to flow toward the first opening 72F and the second duct 73. This makes it possible to suppress pressure loss at the connection between the first duct 72C and the second duct 73.

In the battery pack 20 of this embodiment, the first opening 72F has a dimension L2 in the vehicle front-rear direction that is greater than the dimension L1 in the vehicle up-down direction.

With this configuration, the dimension L2 of the first opening 72F in the vehicle longitudinal direction is set to be larger than the dimension L1 in the vehicle vertical direction, so that air can flow unimpeded from the first duct 72C through the first opening 72F to the second duct 73 in the side duct 75 extending in the vehicle longitudinal direction.

In addition, since the dimension of the first opening 72F in the vehicle front-rear direction can be increased, the contact area of the connection between the first duct 72C and the second duct 73 can be increased, and the first duct 72C and the second duct 73 can be firmly connected. In addition, since the duct mounting portion 80A is provided on the second duct 73 and the first opening 72F of the first duct 72C is located near the duct mounting portion 80A, the first extension portion 81A is connected to the duct mounting portion 80A, so that the portion of the first opening 72F of the first duct 72C can be firmly supported by the duct mounting portion 80A via the first extension portion 81A. Therefore, the vibration of the first opening 72F due to vehicle vibration can be reduced, and the connection between the first duct 72C and the second duct 73 can be prevented from being released.

In the battery pack 20 of this embodiment, the air duct 70 includes a second extension 82B extending from the upstream end 73A of the second duct 73 in the opposite direction to the first extension 81A in the vehicle front-rear direction, a third extension 81B extending from the second duct 73 in the vehicle width direction and overlapping with the first extension 81A in the vehicle vertical direction, and a fourth extension 82A extending from the first duct 72C in the vehicle width direction and overlapping with the second extension 82B in the vehicle vertical direction. The air duct 70 also includes a first attachment 81 which is a connection site between the first extension 81A and the third extension 81B, and a second attachment 82 which is a connection site between the second extension 82B and the fourth extension 82A. When the battery pack 20 is viewed from above the vehicle, the virtual line L connecting the first attachment 81 and the second attachment 82 passes through the first opening 72F.

With this configuration, the first duct 72C and the second duct 73 are connected in a state where the first extension 81A and the third extension 81B, and the second extension 82B and the fourth extension 82A are respectively stacked in the vertical direction of the vehicle. The first duct 72C and the second duct 73 are also connected in a direction different from the vehicle width direction, which is the direction in which they move away from each other. This makes it possible to prevent the connection between the first duct 72C and the second duct 73 from being released due to vibration.

When viewed from above the vehicle, the first mounting portion 81 and the second mounting portion 82 are disposed at different positions in the vehicle width direction, sandwiching the first opening 72F between them. Therefore, when a load acts on the connection between the first duct 72C and the second duct 73, the portion of the first opening 72F close to the first mounting portion 81 and the portion close to the second mounting portion 82 move in a direction toward each other as one moves away from the other. This makes it possible to strengthen the connection between the first duct 72C and the second duct 73. Therefore, vibration of the first duct 72C and the second duct 73 can be suppressed.

In the battery pack 20 of this embodiment, the vehicle body mount portion 22 has a pair of vertical wall portions 22B that extend in the vehicle width direction and are connected to the outer surfaces of the side walls 42 of the battery case 21, an upper wall portion 22A that connects the portions of the upper ends of the pair of vertical wall portions 22B that are close to the side walls 42 of the battery case 21, and a connecting vertical wall portion 22C that connects the portions of the upper ends of the pair of vertical wall portions 22B that are far from the side walls 42 of the battery case 21. The duct attachment portion 80A is provided in an area that faces the connecting vertical wall portions 22C in the vehicle width direction and is located between the pair of vertical wall portions 22B in the vehicle front-rear direction.

With this configuration, the portion of the side wall 42 of the battery case 21 where the duct mounting portion 80A is provided via the duct support portion 80B can be reinforced by the vehicle body mount portion 22, which is firmly constructed by the connecting vertical wall portion 22C and the pair of vertical wall portions 22B. This further reduces vibration of the duct mounting portion 80A, and allows the first duct 72C and the second duct 73 to be more firmly connected.

In the battery pack 20 of this embodiment, the downstream end 72E of the first duct 72C has a curved portion 72G that curves closer to the first opening 72F as it approaches the lower part of the vehicle. The first extension portion 81A is connected to the lower end of the curved portion 72G.

With this configuration, the first extension 81A can contact and connect to the curved portion 72G at the lower end of the curved portion 72G with a contact area larger than the thickness of the curved portion 72G, so the first extension 81A can be more firmly connected to the first duct 72C. This makes it possible to suppress vibration of the first duct 72C and to suppress the connection between the first duct 72C and the second duct 73 from being released.

In the battery pack 20 of this embodiment, the first mounting portion 81 and the second mounting portion 82 are located at different positions in the vertical direction of the vehicle.

With this configuration, when a load acts on the first opening 72F of the side duct 75, when one of the portions of the connection between the first duct 72C and the second duct 73 close to the first mounting portion 81 and the portion close to the second mounting portion 82 moves away from each other, the other moves toward each other. This makes it possible to prevent the connection between the connection between the first duct 72C and the second duct 73 from being disconnected.

In this embodiment, one of the first mounting portion 81 and the second mounting portion 82 is disposed near the upper end of the connection portion between the first duct 72C and the second duct 73, and the other is disposed near the lower end of the connection portion between the first duct 72C and the second duct 73. Therefore, when a tensile force acts on the first mounting portion 81 side of the connection portion, this force acts as a compressive force on the second mounting portion 82 side of the connection portion, and it is possible to prevent a tensile force from acting on the entire connection portion between the first duct 72C and the second duct 73, causing the connection portion to be disconnected.

In the battery pack 20 of this embodiment, the first duct 72C has a bent portion 72H that bends from a direction that is inclined so as to approach the bottom of the vehicle toward the downstream side to a direction parallel to the second duct 73. The fourth extension portion 82A extends from the bent portion 72H.

This configuration allows the fourth extension portion 82A to be firmly established, thereby allowing the second attachment portion 82 to be formed firmly, and further prevents the connection between the first duct 72C and the second duct 73 from being released.

Although an embodiment of the present invention has been disclosed, it is apparent that modifications may be made by one of ordinary skill in the art without departing from the scope of the present invention. All such modifications and equivalents are intended to be included in the following claims.

1...vehicle, 2...vehicle body, 20...battery pack, 21...battery case, 22...vehicle body mount, 22A...upper wall, 22B...vertical wall, 22C...connecting vertical wall, 42...side wall, 61...battery module, 70...air duct, 72C...first duct, 72D...inclined portion, 72E...downstream end, 72F...first opening, 72G...curved portion, 72H...bent portion, 73... .Second duct, 73A...upstream end, 73B...second opening, 75...side duct, 80A...duct mounting part, 80B...duct support part, 81...first mounting part, 81A...first extension part (extension part), 81B...third extension part, 82...second mounting part, 82A...fourth extension part, 82B...second extension part, L...virtual line, L1...dimension (vehicle vertical dimension), L2...dimension (vehicle longitudinal dimension)

Claims (9)

A battery module;
An air duct for supplying air to the battery module;
A battery pack including a battery case that houses the battery module and the air blower duct,
the air blower duct has a side duct extending in a front-rear direction of the vehicle between the battery module and the battery case,
A vehicle body mount portion for attaching the battery case to a vehicle body and a duct support portion for supporting the side duct are provided on a side wall of the battery case,
A duct mounting portion connected to the duct support portion is provided on the side duct,
the side duct includes a first duct having a first opening at a downstream end thereof, and a second duct having a second opening at an upstream end thereof and connected to the first duct such that the first opening and the second opening are opposed to each other in a vehicle width direction and communicate with each other,
The first opening and the second opening are connected in a state of communicating with each other in a vehicle width direction,
The battery pack according to claim 1, wherein the first opening, the second opening, and the duct attachment portion are arranged to overlap the vehicle body mount portion in a vehicle width direction. The first opening is formed along a vehicle front-rear direction and facing inward in a vehicle width direction,
The battery pack according to claim 1 , wherein the second opening is formed along a vehicle front-rear direction and facing outward in a vehicle width direction. a downstream end portion of the first duct, on a surface on an outer side in the vehicle width direction, having an inclined portion inclined so as to approach an inner side in the vehicle width direction toward a downstream side;
The first duct has an extension portion extending in a vehicle front-rear direction from the inclined portion,
3. The battery pack according to claim 2, wherein the extension portion is connected to the duct mounting portion. The first opening has a dimension in a vehicle front-rear direction larger than a dimension in a vehicle up-down direction,
The duct attachment portion is provided on the second duct,
4. The battery pack according to claim 3, wherein the first opening is located near the duct attachment portion. an end of the second duct connected to a downstream end of the first duct is defined as an upstream end;
When the extension portion is a first extension portion,
The air duct is
a second extension portion extending from an upstream end portion of the second duct in an opposite direction to the first extension portion in the vehicle front-rear direction;
a third extension portion extending from the second duct in a vehicle width direction and overlapping with the first extension portion in a vehicle up-down direction;
a fourth extension portion extending from the first duct in a vehicle width direction and overlapping with the second extension portion in a vehicle up-down direction;
a first attachment portion which is a connection portion between the first extension portion and the third extension portion;
a second attachment portion which is a connection portion between the second extension portion and the fourth extension portion,
4. The battery pack according to claim 3, wherein, when viewed from above the vehicle, an imaginary line connecting the first mounting portion and the second mounting portion passes through the first opening. The vehicle body mount portion is
A pair of vertical wall portions extending in a vehicle width direction and connected to outer surfaces of the side walls of the battery case;
an upper wall portion connecting portions of upper ends of the pair of vertical wall portions close to side walls of the battery case;
a connecting vertical wall portion connecting portions of the pair of vertical wall portions at upper ends thereof that are far from the side walls of the battery case,
6. The battery pack according to claim 1, wherein the duct mounting portion is provided in an area facing the connecting vertical wall portion in the vehicle width direction and between a pair of the vertical wall portions in the vehicle front-rear direction. a downstream end of the first duct has a curved portion that curves toward the first opening toward a lower portion of the vehicle,
6. The battery pack according to claim 3, wherein the extension portion is connected to a lower end of the curved portion. The battery pack according to claim 5, characterized in that the first mounting portion and the second mounting portion are positioned differently in the vertical direction of the vehicle. the first duct has a bent portion that bends so as to change direction from a direction inclined so as to approach a vehicle lower side toward a downstream side to a direction parallel to the second duct,
The battery pack according to claim 5 , wherein the fourth extension portion extends from the bent portion.

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