JP2023019486A - Battery pack mounting structure - Google Patents

Abstract

To provide a battery pack mounting structure which can reduce influence on a cabin space and can secure a space for arranging a component below a floor part.SOLUTION: A battery pack 50 is mounted on a battery pack mounting structure 20 above a rear floor panel 14. The battery pack includes a battery module 56, an electrical component 57, and a cooling fan. The battery module is extended in a vehicle width direction. The electrical component controls a battery module. The cooling fan cools the battery module and the electrical component. Furthermore, the battery pack is formed to recess upward so that a thickness in a vertical direction decreases toward a vehicle front part along the floor panel.SELECTED DRAWING: Figure 4

Description

The present invention relates to a battery pack mounting structure.

In recent years, from the viewpoint of the negative impact on the global environment, the practical application of technologies that reduce the burden on the environment, such as by reducing _CO2 emissions, has been promoted, for example, by equipping vehicles with battery packs to electrify them. .
Here, as a battery pack mounting structure to be mounted on a vehicle, there is known one in which a battery pack is mounted under a front seat (first row seat) (see, for example, Patent Document 1). Also, as a conventional battery pack mounting structure, a structure in which a battery pack is mounted in a luggage compartment (vehicle compartment) is known (see, for example, Patent Document 2).

In these battery pack mounting structures, for example, the battery pack is formed in a substantially rectangular parallelepiped shape, and parts are laid out (arranged) in the battery pack. The component group includes, for example, a battery module for high-voltage equipment (hereinafter also referred to as a battery module), a cooling fan, a control device (ECU: Electronic Control Unit), an air duct, and the like. That is, in the battery pack, the high-voltage device battery module and the control device are integrated.

WO2017/110138 WO2016/125388

Here, in order to further reduce the burden on the environment by reducing _CO2 emissions, for example, vehicles with small interior space such as mini cars and ultra-compact cars (hereinafter sometimes referred to as small vehicles) are also electrified. It is desirable to In this case, for example, it is conceivable to mount a battery pack of conventional size/shape having a battery module for high-voltage equipment in the luggage compartment. As a result, the floor of the passenger compartment becomes higher, which greatly affects the space of the passenger compartment (hereinafter also referred to as the passenger compartment space).
If the impact on the vehicle interior space becomes large in this way, it is conceivable that, for example, variation in changing the posture of the rear seats (second-row seats) is limited. Variations for changing the posture of the rear seat include, for example, sliding movement of the seat, reclining movement of the seatback, and dive-down movement of the seat to flatten the rear seat and the floor.

In this way, it is conceivable that convenience and livability will be limited by electrification of small vehicles in particular. Therefore, there is a demand for the practical application of technology for electrifying a vehicle, improving convenience, and ensuring an improvement in comfort of the vehicle.
In addition, when electrifying a small vehicle, it is difficult to secure a space for arranging (laying out) parts below the floor (floor panel).
Furthermore, when electrifying a small vehicle, it is difficult to secure space for arranging (laying out) parts under the floor (floor panel). .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery pack mounting structure that can reduce the impact on the vehicle interior space and secure a space for arranging components under the floor.

In order to solve the above problems, the present invention proposes the following means.
(1) In the battery pack mounting structure according to the present invention, a battery pack (for example, according to the embodiment) is installed in a recess (for example, the floor storage recess 19 according to the embodiment) formed in a floor panel (for example, the rear floor panel 14 according to the embodiment). A battery pack mounting structure (for example, the battery pack mounting structure 20 of the embodiment) in which a battery pack 50) is mounted from above, wherein the battery pack is a battery module extending in the vehicle width direction (for example, the a battery module 56), at least one electrical component that controls the battery module (eg, the electrical component 57 of the embodiment), and a cooling fan that cools the battery module and the electrical component (eg, the cooling fan 58 of the embodiment). ), and further, the battery pack is formed so as to be recessed upward so that the thickness in the vertical direction becomes thinner toward the front of the vehicle along the floor panel.

According to this configuration, the battery pack (specifically, the bottom surface) is formed so as to be recessed upward along the floor panel toward the front of the vehicle, and the thickness of the battery pack becomes thinner toward the front of the vehicle. bottom. Therefore, the height of the battery pack (specifically, the upper surface) can be adjusted. As a result, the height of the battery pack can be suppressed to reduce the impact on the vehicle interior space, and the comfort of the vehicle can be improved.
Further, by forming the battery pack to be recessed upward, the floor panel (that is, the floor) can be formed to protrude upward toward the front of the vehicle. As a result, a space for arranging the parts (hereinafter also referred to as an arrangement space) can be secured under the floor panel.

Here, the electrical components provided in the battery module include a high-voltage junction board, a battery ECU, a DC/DC converter, and the like.
A high-voltage junction board is, for example, a device that supplies electricity from a driving battery module housed in a battery pack to a driving motor. The battery ECU is, for example, a battery management unit that controls discharging and charging between a driving battery module and a driving motor. A DC/DC converter is a device that converts each electronic device provided in a battery pack into a voltage that can operate and stabilizes the converted voltage.
Also, the parts arranged below the floor panel include, for example, a cross member, a power transmission device, and the like.

(2) In the battery pack, the middle section (for example, the middle section of the pack in the embodiment) is thinner in the vertical direction than the rear section (for example, the battery storage section 62 in the embodiment) of the battery pack. portion 84), and a cross member (for example, the first rear cross member 15 of the embodiment) extending in the vehicle width direction may be arranged below the intermediate step portion.

According to this configuration, in the battery pack, the thickness of the middle stage is made thinner than that of the rear stage.
Therefore, a space in which the rear cross member can be arranged can be secured below the middle section (battery pack) without projecting the middle section (battery pack) toward the passenger compartment. A cross member is placed in this space.
As a result, the battery pack can be favorably protected by the cross member while reducing the influence of the cross member on the vehicle interior space.

(3) A power transmission device (for example, the power transmission device 18 of the embodiment) may be arranged below the cross member.

According to this configuration, the middle portion of the battery pack is formed to be thin. Therefore, it is possible to secure a large space in the passenger compartment and to secure a large space (arrangement space) below the floor panel. This allows the power transmission device to be arranged in the space below the floor panel.
Therefore, for example, when the battery pack is mounted at the rear of the vehicle, the battery pack mounting structure can be applied to a four-wheel drive vehicle by arranging a power transmission device for driving the rear wheels in the space below the lower panel. .

(4) The battery module is housed behind the battery pack in the vehicle, the electrical component overlaps the battery module when viewed from the vehicle front-rear direction, and is thinner than the battery module in the vertical direction. good too.

According to this configuration, the electrical component overlaps (overlaps) the battery module when viewed from the vehicle front-rear direction, and the thickness of the electrical component is made thinner than that of the battery module.
Here, the floor panel is formed to protrude upward toward the front of the vehicle. Therefore, by making the electrical components thinner than the battery module, the battery pack is horizontally arranged in a state where the battery pack is arranged along the floor panel. As a result, the height of the battery pack can be suppressed to reduce the impact on the vehicle interior space, and the comfort of the vehicle can be improved.

(5) The battery pack accommodates the electrical components (for example, the battery ECU 91 and the high-voltage junction board 92 of the embodiment) in a state extended toward the front of the vehicle, and an inflow portion ( For example, the inflow portion 63 of the embodiment) accommodates the electrical component (for example, the DC/DC converter 93 of the embodiment) in a state of communicating with the inflow portion and extending toward the front of the vehicle. and an outflow portion (for example, the outflow portion 64 in the embodiment) that flows out from the inside, the inflow portion is formed at the front end portion in front of the vehicle, and the inside of the inflow portion and the vehicle compartment (for example, the It has a first opening (for example, the first opening 81 in the embodiment) that communicates with the vehicle interior 38), and the outflow portion is formed at a front end portion in front of the vehicle, and the inside of the outflow portion and the vehicle It may have a second opening (for example, the second opening 82 in the embodiment) that communicates with the chamber.

According to this configuration, the battery pack is provided with the inflow portion and the outflow portion extending toward the front of the vehicle, and the electrical equipment is accommodated in the inflow portion and the outflow portion. Therefore, the electrical components can be arranged in front of the vehicle from the battery module. As a result, the thickness of the battery pack can be kept thin.
Also, the first opening is formed in the inflow portion to allow communication between the inside of the inflow portion and the vehicle compartment. Furthermore, a second opening is formed in the outflow portion to allow communication between the inside of the outflow portion and the vehicle compartment. In addition, the outflow is communicated with the inflow. Therefore, the fluid (specifically, air) in the passenger compartment can be sucked into the inflow portion through the first opening, and the sucked fluid can be guided to the outflow portion. Furthermore, the fluid guided to the outflow portion can be discharged into the vehicle compartment through the second opening. Thereby, the electrical equipment can be arranged in the inflow and outflow paths of the battery pack. Therefore, the electrical equipment housed in the inflow portion and the outflow portion can be cooled by the fluid sucked from the vehicle compartment.

(6) A pair of first slide rails (for example, , the first slide rail 52 of the embodiment) and a second seat (for example, the right rear seat 23 of the embodiment) provided above the outflow portion, and are spaced apart in the vehicle width direction in the vehicle front-rear direction. a pair of extending second slide rails (e.g., second slide rails 54 of the embodiment), wherein the inflow portion is disposed between the pair of first slide rails, and the outflow portion is located between the pair of first slide rails; It may be arranged between the second slide rails.

Here, the pair of first slide rails and the pair of second slide rails are members having high strength and rigidity that support the first seat and the second seat so as to be movable in the longitudinal direction of the vehicle body.
Therefore, in this configuration, the inflow portion is arranged between the pair of first slide rails, and the outflow portion is arranged between the pair of second slide rails. Accordingly, the pair of first slide rails and the pair of second slide rails can more preferably protect the battery pack.
In particular, when the battery pack is mounted at the rear of the vehicle, the impact load input due to a rear-end collision is supported by the pair of first slide rails and the pair of second slide rails, making the inflow and outflow portions more suitable from the impact load. can be protected.

ADVANTAGE OF THE INVENTION According to this invention, the influence on vehicle interior space can be made small, and the space which arrange|positions components below a floor can be ensured.

1 is a perspective view showing a vehicle equipped with a battery pack mounting structure according to an embodiment of the invention; FIG. 1 is a plan view showing a vehicle having a battery pack mounting structure according to an embodiment; FIG. 1 is an exploded perspective view showing a vehicle having a battery pack mounting structure according to an embodiment; FIG. 1 is a cross-sectional view showing a state in which a vehicle equipped with a battery pack mounting structure according to an embodiment is broken at an inflow portion of a battery pack; FIG. It is a top view which shows the state which removed the pack cover from the battery pack of embodiment, and broke a part. It is a perspective view which shows the state which fracture|ruptured some battery packs of embodiment. It is a top view which shows the state which disassembled the battery pack of embodiment. 1 is a cross-sectional view showing a state in which a vehicle equipped with a battery pack mounting structure according to an embodiment is broken at an outflow portion of a battery pack; FIG.

A battery pack mounting structure according to an embodiment of the present invention will be described below with reference to the drawings. In the drawings below, the arrow FR indicates the front of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow LH indicates the left side of the vehicle. In the embodiment, an example in which the battery pack mounting structure is provided in the rear part of the vehicle will be described as an example, but as another example, the battery pack mounting structure may be provided in other parts of the vehicle such as the front part of the vehicle.

As shown in FIGS. 1 to 3, a vehicle 10 includes a left rear frame 12 and a right rear frame 13, a rear floor panel (floor panel) 14, a first rear cross member (cross member) 15, and a second rear cross. It has a member 16 , a power transmission device 18 , a battery pack mounting structure 20 , a left rear seat (first seat) 22 and a right rear seat (second seat) 23 .

The left rear frame 12 is provided on the left outer side in the vehicle width direction in the lower portion of the rear portion of the vehicle body, and extends from the rear end portion of the left side sill 25 toward the rear of the vehicle. The right rear frame 13 is provided on the right outer side in the vehicle width direction in the lower portion of the rear portion of the vehicle body, and extends from the rear end portion of the right side sill 26 toward the rear of the vehicle.
The left rear frame 12 and the right rear frame 13 are, for example, high-rigidity frame members that constitute part of the vehicle body frame by being formed with a hollow closed cross section. The left side sill 25 and the right side sill 26 are, for example, high-rigidity frame members that form part of the vehicle body frame by being formed with a hollow closed cross section.

As shown in FIGS. 3 and 4, the rear floor panel 14 is provided between the left rear frame 12 and the right rear frame 13. As shown in FIGS. The rear floor panel 14 has a left joint portion 31 , a right joint portion 32 , a floor surface portion 33 , a front floor portion 34 , a middle floor portion 35 , and a rear floor portion 36 .
The left joint portion 31 is joined to the upper surface of the left rear frame 12 . The right joint portion 32 is joined to the upper surface of the right rear frame 13 . The floor surface portion 33 is arranged in front of the vehicle with respect to a pair of first slide rails 52 and a pair of second slide rails 54 , which will be described later, and forms a floor surface of the passenger compartment 38 .

The rear floor portion 36 is formed at a portion of the rear floor panel 14 behind the vehicle. The rear floor portion 36 is recessed downward to a relatively large extent with respect to the floor surface portion 33 and formed flat and horizontal. The middle floor portion 35 extends continuously forward of the vehicle from the rear floor portion 36 . The middle floor portion 35 is formed flat and horizontal while being disposed above the rear floor portion 36 . The front floor portion 34 extends continuously forward of the vehicle from the middle floor portion 35 toward the floor surface portion 33 . The front floor portion 34 is formed flat and horizontal while protruding upward with respect to the middle floor portion 35 and the floor surface portion 33 .

Therefore, the rear floor panel 14 is formed to protrude upward from the rear floor portion 36 to the front floor portion 34 via the middle floor portion 35 toward the front of the vehicle. As a result, a relatively large space 39 (hereinafter also referred to as "arrangement space 39") can be secured below the rear floor panel 14 (that is, the floor).
Further, the rear floor panel 14 is formed with a floor storage recess (recess) 19 recessed downward by a middle floor portion 35 and a rear floor portion 36 . A middle pack portion 84 and a battery storage portion (rear pack portion) 62 of the battery pack 50 to be described later are stored in the floor storage recess 19 .

The first rear cross member 15 extends in the vehicle width direction along the lower surface of the middle floor portion 35, for example. The first rear cross member 15 has a left end portion 15a joined to the lower end portion of the left rear frame 12 and a right end portion 15b joined to the lower end portion of the right rear frame 13 . The first rear cross member 15 is formed with a first U-shaped cross-sectional portion 41 , a first front flange 42 and a first rear flange 43 to have a hat-shaped cross section.
The first rear cross member 15 has a first front flange 42 and a first rear flange 43 joined to the lower surface of the middle floor portion 35 . Therefore, the first rear cross member 15 is a member having high strength and rigidity formed with a closed cross-section together with the middle floor portion 35 .
A power transmission device 18 is arranged below the first rear cross member 15 . The reason for disposing the power transmission device 18 below the first rear cross member 15 will be described later in detail.

For example, the second rear cross member 16 extends in the vehicle width direction while being provided across the lower surface of the floor surface portion 33 and the lower surface of the front floor portion 34 . The second rear cross member 16 has a left end portion 16 a joined to the lower end portion of the left rear frame 12 and a right end portion 16 b joined to the lower end portion of the right rear frame 13 . The second rear cross member 16 is formed with a second U-shaped cross-sectional portion 45, a second front flange 46, and a second rear flange 47 to have a hat-shaped cross section.
The second rear cross member 16 has a second front flange 46 joined to the lower surface of the floor portion 33 and a second rear flange 47 joined to the lower surface of the front floor portion 34 . Therefore, the second rear cross member 16 is a member with high strength and rigidity formed with a closed cross-section together with the floor portion 33 and the floor front step portion 34 .

The battery pack mounting structure 20 is arranged above the rear floor panel 14 . The battery pack mounting structure 20 includes a battery pack 50, a pack support frame 51, a pair of first slide rails 52 (see also FIG. 2), and a pair of second slide rails 54 (see FIG. 2).
Pack support frame 51 extends in the vehicle width direction by bridging battery pack 50 over the upper surface of left rear frame 12 and the upper surface of right rear frame 13 . The battery pack 50 is supported by the pack support frame 51 . Thereby, the battery pack 50 is supported by the upper surface of the left rear frame 12 and the upper surface of the right rear frame 13 via the pack support frame 51 and is mounted (arranged) above the rear floor panel 14 .

As shown in FIGS. 4 to 6 , the battery pack 50 includes a pack housing 55 , battery modules 56 , electrical components 57 , cooling fans 58 and cooling ducts 59 . The pack housing 55 is formed in a U shape in a plan view by the battery storage portion 62, the inflow portion 63, and the outflow portion 64. As shown in FIG. The battery housing portion 62, the inflow portion 63, and the outflow portion 64 will be described later in detail.

The pack housing 55 includes a pack case 65 having a stepped bottom and a pack cover 66 having a substantially flat top. The pack case 65 includes, for example, a pair of front walls 71 , a pair of lower surface front step portions 72 , a pair of first inclined walls 73 , a pair of lower surface middle step portions 74 , a second inclined wall 75 , and a lower surface rear step portion 76 . and a rear wall 77 .
Hereinafter, the pair of front walls 71, the pair of lower surface front steps 72, the pair of first inclined walls 73, and the pair of lower surface middle steps 74 are referred to as the front walls 71, the lower surface front steps 72, the first inclined walls 73, and the lower surface middle steps. It may also be abbreviated as part 74 .

The lower surface rear stage portion 76 is arranged substantially horizontally along the floor rear stage portion 36 above the floor rear stage portion 36 in the floor storage recess 19 .
The lower surface middle step portion 74 is arranged so as to be recessed upward with respect to the lower surface rear step portion 76 in front of the lower surface rear step portion 76 with respect to the vehicle. The lower surface middle step portion 74 is formed continuously with the lower surface rear step portion 76 via the second inclined wall 75 . The lower surface middle section 74 is arranged substantially horizontally along the floor middle section 35 above the floor middle section 35 in the floor storage recess 19 .
The lower surface front step portion 72 is arranged so as to be recessed upward with respect to the lower surface middle step portion 74 in front of the lower surface middle step portion 74 with respect to the vehicle. The lower surface front step portion 72 is formed continuously with the lower surface middle step portion 74 via the first inclined wall 73 . The lower surface front step portion 72 is arranged substantially horizontally along the floor front step portion 34 above the floor front step portion 34 .

That is, the battery pack 50 is mounted from above in a floor storage recess 19 formed in the rear floor panel 14 . In addition, the pack case 65 has a lower surface rear stage portion 76, a lower surface intermediate stage portion 74, and a lower surface front stage portion 72 toward the front of the vehicle. Further, the rear floor panel 14 has a rear floor portion 36, a middle floor portion 35, and a front floor portion 34 facing forward of the vehicle. Further, the stepped portions 76, 74, 72 of the pack case 65 are formed so as to gradually recess upward along the stepped portions 36, 35, 34 of the rear floor panel 14 toward the front of the vehicle. .

The pack case 65 has an opening at the upper end. The opening of the pack case 65 is covered with a pack cover 66 from above.
The pack cover 66 is formed flat and arranged substantially horizontally when attached to the opening of the pack case 65 . The pack case 65 and the pack cover 66 form a generally sealed pack housing 55 .

In addition, as described above, the pack housing 55 is formed in a U shape in a plan view by the battery housing portion 62, the inflow portion 63, and the outflow portion 64. As shown in FIG.
The rear part 66 a of the pack cover 66 and the rear part 76 of the lower surface of the pack case 65 form a rear part of the battery storage part 62 . The battery storage section 62 is located in the rear portion of the pack housing 55 in the vehicle body. The battery storage portion 62 has a vertical thickness set to T1 so as to store (arrange) a battery module 56, which will be described later, and extends in the vehicle width direction.

The inflow portion 63 extends from the left end portion of the battery storage portion 62 toward the front of the vehicle and communicates with the battery storage portion 62 . The inflow portion 63 has a first inflow portion 63a and a second inflow portion 63b. The first inflow portion 63a extends from the left end portion of the battery storage portion 62 toward the front of the vehicle. The first inflow portion 63a has a thickness T2 in the vertical direction so that a part of the electrical component 57 (high-voltage junction board 92), which will be described later, can be accommodated (arranged). The thickness T2 of the first inflow portion 63a is set thinner than the thickness T1 of the battery storage portion 62 .

The second inflow portion 63b extends forward of the vehicle from the front end portion of the second inflow portion 63b. The second inflow portion 63b has a thickness of T3 in the vertical direction so that part of the electrical component 57 (battery ECU 91), which will be described later, can be accommodated (arranged). The thickness T3 of the second inflow portion 63b is set thinner than the thickness T2 of the first inflow portion 63a.
The second inflow portion 63b has a first opening 81 formed at a front end portion in front of the vehicle. For example, the first opening 81 communicates between the vehicle interior 38 and the inside of the second inflow portion 63b (that is, the inflow portion 63) by opening downward.

The outflow portion 64 extends toward the front of the vehicle from the right end portion of the battery storage portion 62 and communicates with the inflow portion 63 via the battery storage portion 62 . The outflow portion 64 has a first outflow portion 64a and a second outflow portion 64b. The first outflow portion 64a extends from the right end portion of the battery storage portion 62 toward the front of the vehicle. The first outflow portion 64a has a thickness of T2 in the vertical direction so that a cooling fan 58, which will be described later, can be housed (arranged). The thickness T2 of the first outflow portion 64a is set thinner than the thickness T1 of the battery housing portion 62 .

The second outflow portion 64b extends forward of the vehicle from the front end portion of the second outflow portion 64b. The second outflow portion 64b has a thickness of T3 in the vertical direction so that part of the electrical component 57 (battery ECU 93), which will be described later, can be accommodated (arranged). The thickness T3 of the second outflow portion 64b is set thinner than the thickness T2 of the first outflow portion 64a.
The second outflow portion 64b has a second opening 82 formed at the front end portion in front of the vehicle. For example, the second opening 82 communicates between the compartment 38 and the inside of the second outflow portion 64b (that is, the outflow portion 64) by opening downward.

The first inflow portion 63 a and the first outflow portion 64 a form a pack middle portion (middle portion) 84 of the pack housing 55 by the center portion 66 b of the pack cover 66 and the lower surface middle portion 74 of the pack case 65 . The middle pack portion 84 is set to have a thickness T2 so as to be thinner than the thickness T1 of the battery housing portion 62 (the rear portion of the pack). The lower surface middle section 74 of the pack middle section 84 is arranged along the floor middle section 35 of the floor storage recess 19 .

The second inflow portion 63 b and the second outflow portion 64 b form a pack front step portion 85 of the pack housing 55 with the front portion 66 c of the pack cover 66 and the lower front step portion 72 of the pack case 65 . The pack front stage portion 85 is set to have a thickness T3 so as to be thinner than the thickness T2 of the pack front stage portion 85 . The lower surface front step portion 72 of the pack front step portion 85 is arranged along the floor front step portion 34 of the rear floor panel 14 .
Further, the lower surface rear part 76 of the battery storage part 62 (pack rear part) is arranged along the floor rear part 36 of the floor storage recess 19 .

That is, the pack housing 55 (that is, the battery pack 50) is formed such that its bottom surface is recessed upward so that the thickness in the vertical direction becomes thinner toward the front of the vehicle along the rear floor panel 14 . Therefore, the thickness of the battery pack 50 can be made thinner toward the front of the vehicle. Thereby, the height of the battery pack 50 (specifically, the upper surface) can be adjusted. Therefore, the height of the battery pack 50 can be suppressed to reduce the impact on the space of the passenger compartment 38 (hereinafter also referred to as the passenger compartment space), and the comfort of the vehicle 10 can be improved.

Further, by forming the bottom surface of the battery pack 50 to be recessed upward, the rear floor panel 14 protrudes upward toward the front of the vehicle from the rear floor section 36 to the front floor section 34 via the middle floor section 35. can be formed to Thereby, an arrangement space 39 for arranging components can be secured under the rear floor panel 14 (that is, the floor).
The parts arranged below the rear floor panel 14 include, for example, the first rear cross member 15 and the power transmission device 18 .

A pack housing 55 houses a battery module 56 , electrical components 57 , a cooling fan 58 , and a cooling duct 59 .
The battery module 56 is, for example, a driving battery module. The battery module 56 extends in the vehicle width direction while being housed in the battery housing portion 62 at the rear of the vehicle in the pack housing 55 . The battery storage portion 62 is set to have a thickness T1 so that the battery module 56 can be stored therein. The battery module 56 is, for example, formed into a rectangular body by stacking a plurality of batteries in the vehicle width direction, and is stored in the battery storage section 62 facing the vehicle width direction.

The electrical components 57 include, for example, a battery ECU 91 (hereinafter also referred to as ECU 91), a high voltage junction board 92 (hereinafter also referred to as J/B 92), and a DC/DC converter 93. At least one electrical component 57 may be provided.

The ECU 91 is arranged, for example, along the front portion 66c and the lower surface front portion 72 of the pack cover 66 inside the second inflow portion 63b. The ECU 91 is, for example, a battery management unit that controls discharging and charging between the drive battery module 56 and a drive motor (not shown).
The J/B 92 is arranged, for example, along the central portion 66b and the lower surface middle portion 74 of the pack cover 66 inside the first inflow portion 63a. The J/B 92 is, for example, a device that supplies electricity from the driving battery module 56 housed in the battery housing section 62 to the driving motor.
The ECU 91 and the J/B 92 are arranged so as to overlap the battery module 56 when viewed in the vehicle front-rear direction. Further, the ECU 91 and the J/B 92 are set thinner in the vertical direction than the thickness of the battery module 56 .

The DC/DC converter 93 is arranged, for example, along the front portion 66c of the pack cover 66 and the lower surface front step portion 72 inside the second outflow portion 64b. The DC/DC converter 93 converts each electronic device (specifically, the ECU 91 and the J/B 92) provided in the inflow part 63 of the pack housing 55 into a voltage that can operate, and stabilizes the converted voltage. Equipment.
The DC/DC converter 93 is arranged so as to overlap (overlap) the battery module 56 when viewed from the vehicle front-rear direction. Furthermore, the DC/DC converter 93 is set thinner in the vertical direction than the thickness of the battery module 56 .

The cooling fan 58 is arranged, for example, along the central portion 66b and the lower surface intermediate portion 74 of the pack cover 66 inside the first outflow portion 64a. The cooling fan 58 is arranged so as to overlap the battery module 56 when viewed from the vehicle front-rear direction. Furthermore, the cooling fan 58 is set thinner in the vertical direction than the thickness of the battery module 56 .
Cooling fan 58 operates to cool battery module 56 , ECU 91 , J/B 92 and DC/DC converter 93 . An example of cooling the battery module 56, the ECU 91, the J/B 92, and the DC/DC converter 93 will be described later in detail.

Thus, the battery pack 50 is provided with an inflow portion 63 and an outflow portion 64 extending toward the front of the vehicle. Further, the inflow portion 63 accommodates an ECU 91 and a J/B 92 . Further, the outflow portion 64 accommodates the DC/DC converter 93 and the cooling fan 58 . Therefore, the ECU 91 and J/B 92, the DC/DC converter 93 and the cooling fan 58 can be arranged in front of the vehicle from the battery module 56. FIG. Thereby, the thickness of the battery pack 50 can be kept thin.

The ECU 91 and the J/B 92 of the inflow portion 63 overlap the battery module 56 when viewed from the vehicle front-rear direction, and are set thinner than the battery module 56 . Furthermore, the DC/DC converter 93 and the cooling fan 58 of the outflow portion 64 overlap the battery module 56 when viewed from the front-rear direction of the vehicle, and are set thinner than the battery module 56 .
Here, the rear floor panel 14 is formed to protrude upward toward the front of the vehicle. Therefore, the battery pack 50 can be horizontally arranged in a state where the battery pack 50 is arranged along the rear floor panel 14 . As a result, the height of the battery pack 50 can be suppressed to reduce the impact on the vehicle interior space, and the comfort of the vehicle 10 can be improved.

The cooling fan 58 has an intake port provided at the bottom, and an exhaust port 58a opened to the inside of the second outflow portion 64b. The intake port opens into a cooling duct 59 (described later) of the first outflow portion 64a. A partition wall 95 is provided at the boundary between the first outflow portion 64a and the second outflow portion 64b. The partition wall 95 partitions the boundary between the first outflow portion 64a and the second outflow portion 64b, and has an open portion facing the discharge port 58a. Therefore, the discharge port 58a opens to the second outflow portion 64b and communicates with the second opening portion 82 via the second outflow portion 64b.

As shown in FIGS. 7 and 8, the cooling duct 59 is provided in the battery storage section 62, the second inclined wall 75, and the first outflow section 64a. The second slanted wall 75 is a slanted wall that connects the rear lower surface portion 76 of the battery housing portion 62 and the middle lower surface portion 74 of the first outflow portion 64a.
The cooling ducts 59 are arranged, for example, at the lower rear stage portion 76 and the rear end portions of the battery modules 56 inside the battery housing portion 62 . In addition, the cooling duct 59 has a suction opening, for example, behind the battery module 56 . Further, the cooling duct 59 is arranged in the lower surface middle stage portion 74 inside the first outflow portion 64 a and below the cooling fan 58 . The cooling duct 59 has a discharge port 59 a opening toward the intake port of the cooling fan 58 .

As shown in FIGS. 3, 4 and 8, below the lower middle step portion 74 of the first outflow portion 64a and the lower middle step portion 74 of the first inflow portion 63a (that is, the lower middle step portion 74 of the pack case 65), The first rear cross member 15 is arranged to extend in the vehicle width direction. Specifically, the first rear cross member 15 has a first front flange 42 and a first rear flange 43 joined to the lower surface of the middle floor portion 35 .

Here, in the battery pack 50, the thickness T2 of the pack middle stage portion 84 is set thinner than the pack rear stage portion (battery housing portion 62). That is, the lower middle step portion 74 of the pack case 65 (the lower middle step portion 74 of the first outflow portion 64a and the lower middle step portion 74 of the first inflow portion 63a) is recessed upward with respect to the lower rear step portion 76 of the pack case 65. is formed in
Therefore, the middle floor portion 35 of the rear floor panel 14 can be formed so as to be recessed upward with respect to the rear floor portion 36 . As a result, a large arrangement space 39 can be secured below the middle floor portion 35 without causing the middle pack portion 84 (battery pack 50 ) to protrude toward the vehicle interior 38 . The first rear cross member 15 is arranged in this arrangement space 39 . Therefore, the battery pack 50 can be preferably protected by the first rear cross member 15 while reducing the influence of the battery pack 50 on the space of the vehicle interior 38 .

A power transmission device 18 for driving the rear wheels, for example, is arranged below the first rear cross member 15 . Here, a large arrangement space 39 is ensured below the middle floor portion 35 . Therefore, the power transmission device 18 can be arranged below the first rear cross member 15 . That is, it becomes possible to arrange the power transmission device 18 in the arrangement space 39 of the rear floor panel 14 . The power transmission device 18 drives the left and right rear wheels 97 .
Therefore, for example, when the battery pack 50 is mounted at the rear of the vehicle, the battery pack mounting structure is also applicable to a vehicle configured for four-wheel drive by arranging the power transmission device 18 for driving the rear wheels in the arrangement space 39 of the rear floor panel 14. 20 can be adapted (applied).

As shown in FIGS. 2, 4, and 8, above the battery pack 50, a pair of first slide rails 52 and a pair of second slide rails 54 are provided.
The pair of first slide rails 52 are provided on the left side of the vehicle 10 and above the inflow portion 63 . Of the pair of first slide rails 52 , the left outer first slide rail 52 is supported by the second rear cross member 16 via the floor surface portion 33 of the rear floor panel 14 , for example, at the front end portion 52 a thereof. The left outer first slide rail 52 is provided along the left rear frame 12, for example.

Of the pair of first slide rails 52 , the left center first slide rail 52 is supported by the second rear cross member 16 via the floor surface portion 33 of the rear floor panel 14 , for example, at the front end portion 52 a thereof. Further, the rear part 52b of the first slide rail 52 on the left center side is supported by the seat rail support portion 98, for example.
The seat rail support portion 98 is arranged between the first inflow portion 63a and the first outflow portion 64a. The seat rail support portion 98 is supported from above by the central portion 15c of the first rear cross member 15 in the vehicle width direction.

That is, the pair of first slide rails 52 extends in the vehicle front-rear direction with a gap in the vehicle width direction. An inflow portion 63 is arranged between the pair of first slide rails 52 .
A left rear seat 22 (see FIG. 1) is supported by the pair of first slide rails 52 so as to be movable in the longitudinal direction of the vehicle. In this state, the left rear seat 22 is provided above the inflow portion 63 .

The pair of second slide rails 54 are provided on the right side of the vehicle 10 and above the outflow portion 64 . Of the pair of second slide rails 54 , the right outer second slide rail 54 is supported by the second rear cross member 16 via the floor portion 33 of the rear floor panel 14 , for example, at the front end portion 54 a thereof. The right outer second slide rail 54 is provided along the right rear frame 13 .
Of the pair of second slide rails 54 , the second slide rail 54 on the right center side is supported by the second rear cross member 16 via the floor surface portion 33 of the rear floor panel 14 at its front end portion 54 a , for example. The second slide rail 54 on the right center side is supported by the seat rail support portion 98 at the rear portion 54b, for example.

That is, the pair of second slide rails 54 extends in the vehicle front-rear direction with a gap in the vehicle width direction. An outflow portion 64 is arranged between the pair of second slide rails 54 .
A right rear seat 23 (see FIG. 1) is supported by the pair of second slide rails 54 so as to be movable in the longitudinal direction of the vehicle. In this state, the right rear seat 23 is provided above the outflow portion 64 .

Here, the pair of first slide rails 52 are members having high strength and rigidity that support the left rear seat 22 so as to be movable in the longitudinal direction of the vehicle body. Therefore, by disposing the inflow portion 63 between the pair of first slide rails 52 , the battery pack 50 (specifically, the inflow portion 63 ) can be more preferably protected by the pair of first slide rails 52 .
Also, the pair of second slide rails 54 are members having high strength and rigidity that support the right rear seat 23 so as to be movable in the longitudinal direction of the vehicle body. Therefore, by disposing the outflow portion 64 between the pair of second slide rails 54 , the battery pack 50 (specifically, the outflow portion 64 ) can be more preferably protected by the pair of second slide rails 54 .

In particular, when the battery pack 50 is mounted at the rear of the vehicle as in the embodiment, the impact load input due to a rear collision can be supported by the pair of first slide rails 52 and the pair of second slide rails 54 . As a result, the inflow portion 63 and the outflow portion 64 can be better protected from impact loads by the pair of first slide rails 52 and the pair of second slide rails 54 .

Next, an example of cooling the battery module 56 of the battery pack 50, the ECU 91, the J/B 92, and the DC/DC converter 93 will be described with reference to FIGS. 5 and 8. FIG.
As shown in FIGS. 5 and 8, by driving the cooling fan 58, the air (fluid) in the cooling duct 59 is sucked through the outlet 59a of the cooling duct 59 and the intake port. The cooling fan 58 discharges the sucked air from the outlet 58a to the second outlet 64b. Here, the second outflow portion 64b is separated from the first outflow portion 64a by a partition wall 95 . Therefore, the air discharged from the outlet 58a of the cooling fan 58 to the second outflow portion 64b is guided to the second opening 82 without returning to the first outflow portion 64a. (indoor space) can be reliably discharged as shown by arrow A.

The air in the cooling duct 59 is sucked into the cooling fan 58 , so that the air in the battery storage section 62 is sucked into the cooling duct 59 through the suction port of the cooling duct 59 as indicated by an arrow B. The air in the battery storage portion 62 is sucked into the cooling duct 59, thereby guiding the air in the first inflow portion 63a into the battery storage portion 62 as indicated by an arrow C. As shown in FIG. By guiding the air in the first inflow portion 63a into the battery storage portion 62, the air in the second inflow portion 63b is guided into the first inflow portion 63a as indicated by an arrow D. By guiding the air in the second inflow portion 63b into the first inflow portion 63a, the air in the vehicle compartment space is guided into the second inflow portion 63b through the first opening 81 as indicated by an arrow E.

In this way, by driving the cooling fan 58, the air in the passenger compartment space is sucked into the inflow portion 63 from the first opening 81, and the sucked air is guided to the battery storage portion 62 and the outflow portion 64 ( inflow). Furthermore, the air guided to the outflow portion 64 can be discharged into the vehicle interior space through the second opening portion 82 .
As a result, the ECU 91 and the J/B 92 housed inside the inflow portion 63 can be cooled by the air sucked from the indoor space. Also, the battery module 56 housed inside the battery housing portion 62 (cooling duct 59 ) can be cooled by the air introduced from the inflow portion 63 . Furthermore, the DC/DC converter 93 housed inside the outflow portion 64 can be cooled by the air guided from the battery housing portion 62 (cooling duct 59).

The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

10 vehicle 14 rear floor panel (floor panel)
15 1st rear cross member (cross member)
18 Power transmission device 19 Storage recess (recess)
20 Battery pack mounting structure 22 Left rear seat (first seat)
23 Right rear seat (second seat)
38 Vehicle interior 50 Battery pack 52 First slide rail 54 Second slide rail 56 Battery module 57 Electrical component 58 Cooling fan 62 Battery storage (latter stage, pack rear stage)
63 Inflow part 64 Outflow part 81 First opening 82 Second opening 84 Pack middle part (middle part)
91 Battery ECU (ECU)
92 high voltage junction board (J/B)
93 DC/DC converter

Claims (6)

A battery pack mounting structure in which a battery pack is mounted from above in a recess formed in a floor panel,
The battery pack is
a battery module extending in the vehicle width direction;
at least one electrical component that controls the battery module;
a cooling fan that cools the battery module and the electrical components,
Furthermore, the battery pack is
It is formed so as to be recessed upward so that the thickness in the vertical direction becomes thinner toward the front of the vehicle along the floor panel.
A battery pack mounting structure characterized by: The battery pack is
The battery pack has a middle stage portion that is thinner in the vertical direction than a rear stage portion at the rear of the vehicle,
A cross member extending in the vehicle width direction is arranged below the middle section.
The battery pack mounting structure according to claim 1, characterized in that: A power transmission device is arranged below the cross member,
The battery pack mounting structure according to claim 2, characterized in that: The battery module is housed behind the battery pack in the vehicle,
The electrical component is
overlaps the battery module when viewed from the front-rear direction of the vehicle, and is thinner than the battery module in the vertical direction;
The battery pack mounting structure according to any one of claims 1 to 3, characterized in that: The battery pack is
an inflow portion that accommodates the electrical components in a state of being extended toward the front of the vehicle and that allows fluid to flow into the interior;
an outflow part that is communicated with the inflow part and that accommodates the electrical components in a state of being extended toward the front of the vehicle and that allows the fluid to flow out from the inside;
The inflow part is
Having a first opening formed at a front end portion in front of the vehicle and communicating between the inside of the inflow portion and the vehicle compartment,
The outflow part is
A second opening formed at a front end portion in front of the vehicle and communicating between the inside of the outflow portion and the vehicle compartment,
The battery pack mounting structure according to any one of claims 1 to 4, characterized in that: a pair of first slide rails supporting a first seat provided above the inflow portion and extending in the vehicle front-rear direction with a gap in the vehicle width direction;
a pair of second slide rails supporting a second seat provided above the outflow portion and extending in the vehicle front-rear direction with a gap in the vehicle width direction;
The inflow portion is arranged between the pair of first slide rails,
The outflow portion is arranged between the pair of second slide rails,
The battery pack mounting structure according to claim 5, characterized in that:

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