JP2019091605A - Battery pack protective structure for vehicle - Google Patents

Abstract

To obtain a battery pack protective structure for a vehicle capable of making improvement of a drivable distance and improvement of the protection performance of a battery pack compatible.SOLUTION: A battery pack protective structure 10 includes: a battery pack 12 arranged under a floor of a vehicle; a battery pack frame 14 arranged so as to surround a lateral face of the battery pack 12 and supporting the battery pack 12; a pair of right and left under reinforcements 18 extending in the longitudinal direction of the vehicle on the outside of the vehicle width direction of the battery pack 12 and joined to the battery pack frame 14, respectively; and a brace 16 for coupling one and the other of the outside of the vehicle width direction of the battery pack frame 14 in the vehicle width direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a protection structure of a battery pack mounted on a vehicle.

  Patent Document 1 discloses a vehicle in which a battery pack is mounted at the lower part of a vehicle body. In the structure disclosed in Patent Document 1, a space is provided on the inner side of a rocker panel provided on the outer side of the vehicle. Furthermore, in this space, a structure is provided to disperse part of the collision load toward the upper side of the vehicle at the time of a side collision of the vehicle. According to such a structure, the energy due to the collision can be dispersed to protect the battery pack.

JP, 2013-028191, A

  By the way, in the configuration disclosed in Patent Document 1, it is necessary to secure a sufficient space between the rocker panel and the battery pack for changing the direction of the collision load. In addition, in order to cope with collision loads from both the left and right sides of the vehicle, it is necessary to secure a sufficient space on both the left and right sides of the battery pack.

  On the other hand, securing such a space relatively reduces the space for arranging the battery pack. Generally, a battery pack having a large capacity tends to be large in size. Therefore, in the configuration of Patent Document 1, the size of the battery pack is limited, and the cruising distance of a vehicle traveling using the battery pack tends to be short.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle battery pack protection structure capable of achieving both improvement of the cruising distance and improvement of the protection performance of the battery pack in consideration of the above fact.

  A battery pack protection structure according to the present invention according to claim 1 includes a battery pack disposed under a floor of a vehicle, and a battery pack frame disposed so as to surround a side surface of the battery pack and supporting the battery pack. A pair of left and right under reinforcements that extend in the vehicle longitudinal direction outside the battery pack in the vehicle width direction and are joined to the battery pack frame respectively, and one and the other of the battery pack frame in the vehicle width direction And a brace connected in the vehicle width direction.

  According to the present invention, when a collision from the side of the vehicle occurs, the collision load input to the under-reinforcement is transmitted to the anti-collision side via the battery pack frame and the under brace. Be Thus, the load applied to the battery pack can be reduced by dispersing the collision load input from the side to the anti-collision side bypassing the battery pack.

  Further, by transmitting the collision load in this manner, it is not necessary to provide a space for battery pack protection on the side of the battery pack, and the battery pack can be effectively protected in a small space. As a result, a larger battery pack can be mounted on the vehicle, and the cruising distance can be improved.

  As described above, the battery pack protection structure according to the present invention has an excellent effect that the improvement of the cruising distance and the improvement of the protection performance of the battery pack can be compatible.

It is a perspective view showing a battery pack protection structure concerning this embodiment. It is a perspective view which shows the battery pack in the battery pack protection structure of FIG. It is a perspective view which shows a floor panel, a center panel, and a brace in the battery pack protection structure of FIG. FIG. 2 is a perspective view showing a battery pack frame and an under-reinforcement in the battery pack protection structure of FIG. 1; It is the perspective view which looked at the battery pack protection structure in the battery pack protection structure of FIG. 1 from the vehicle lower side. It is sectional drawing which cut | disconnected a battery pack protection structure which concerns on this embodiment, and some peripheral components of a vehicle by the AA line of FIG.

  Hereinafter, an embodiment of a battery pack protection structure according to the present invention will be described with reference to the drawings. In addition, arrow FR suitably shown by each figure has shown vehicle forward, arrow UP has shown vehicle upper direction, and arrow RH has each shown vehicle right direction. Further, in the following description, when the front, rear, top, bottom, left, and right directions are used unless otherwise specified, the left, right, top, bottom, top, bottom, left, right when traveling in the vehicle vertical direction are indicated.

  First, the battery pack protection structure in the present embodiment is assumed to be disposed between the left and right lockers of the vehicle, that is, below the seat of the vehicle.

  FIG. 1 shows a battery pack protection structure 10 according to the present embodiment as viewed obliquely from above. As shown in this figure, the battery pack 12 to be protected by the battery pack protection structure 10 is disposed under the floor of the vehicle body, that is, on the lower side of the floor panel 20 and the rear floor 30 of the vehicle. In other words, the upper surface of the battery pack 12 is covered by the floor panel 20 and the rear floor 30. Further, on the upper surface of the front of the floor panel 20, a seat mounting and connecting brace 22 (hereinafter referred to as “connecting brace 22” as appropriate) continuous along the vehicle width direction is disposed. A front end of a seat (not shown) is attached.

  FIG. 2 shows the battery pack 12. As shown in FIG. 2, in the battery pack 12 according to the present embodiment, the thickness in the height direction is thin, and the lengths in the front-rear and left-right directions are longer (broad) than the thickness. The battery pack 12 has a rectangular shape on the front side and a polygonal shape having a width slightly smaller on the rear side than the front side in top view. Further, a flange 28 extending outward in the horizontal direction is provided on the side surface of the battery pack 12 along the entire circumference.

  FIG. 6 is a cross-sectional view of battery pack protection structure 10 in a portion corresponding to the cross section AA in FIG. 1 and its peripheral parts. As shown in FIG. 6, the flange 28 is provided on the side surface portion of the battery pack 12 slightly closer to the lower end.

  Returning to FIG. 1, as described above, the floor panel 20 is arranged to cover the upper surface of the front side of the battery pack 12. Further, the front end portion of the floor panel 20 is bent downward and covers the front end side surface of the battery pack 12. Furthermore, the left and right end portions of the floor panel 20 are also bent downward, and respectively cover the front portions of the side surfaces of the battery pack 12. A rectangular projection is provided on the front upper surface portion of the floor panel 20 near the center in the left-right direction.

  As shown in FIG. 6, the end in the vehicle width direction outside of the floor panel 20 described above is joined to the locker 26. The locker 26 is one of the vehicle body frame members whose longitudinal direction is the longitudinal direction of the vehicle, and has a substantially rectangular closed cross-section structure by the rocker outer panel 26A and the rocker inner panel 26B each having a substantially hat-shaped cross section. ing. Further, an under-reinforcement 18 whose longitudinal direction is the longitudinal direction of the vehicle is disposed on the lower surface side in the vicinity of the end portion of the floor panel 20 on the outer side in the vehicle width direction. The under-reinforcement 18 has a cross-sectional shape in which the vehicle upper side is opened as described later, and is joined to the floor panel 20 to form a rectangular closed cross-sectional structure. The under-reinforcement 18 is also one of the vehicle frame members.

  FIG. 4 is a view showing the configuration of the floor panel 20, the rear floor 30, and the connection brace 22. As shown in FIG. As shown in FIG. 4, a rear floor 30 is disposed behind the floor panel 20. The rear floor 30 is disposed to cover the upper surface of the rear side of the battery pack 12. Further, the rear floor 30 has a curved shape such that the rear end side has an arc at the top. The curved portion is separated from the battery pack 12 as it goes to the rear, and moves to the under floor side of the vehicle.

  The connection brace 22 described above is disposed on the upper side of the floor panel 20. The connection brace 22 is disposed along the upper surface of the floor panel 20 near the front. Further, the connection brace 22 is disposed from one end to the other end of the left and right ends of the rear floor 30. Since a rectangular protrusion is provided on the front upper surface of the floor panel 20, the connection brace 22 is also bent along the protrusion.

  Further, as shown in FIG. 6, the connection brace 22 has a hat-shaped cross-sectional shape, and is joined to the upper surface of the floor panel 20 to form a hollow closed cross-section. On the other hand, the connection brace 22 has a larger hollow cross-section at a portion located on the side surface of the battery pack 12 as compared with a portion located on the upper portion of the battery pack 12. Further, the end in the vehicle width direction outer side of the connection brace 22 is joined to the upper inside of the inner locker panel 26B.

  Around the battery pack 12, a battery pack frame 14 configured in a rectangular frame shape in a plan view is disposed. The battery pack frame 14 is disposed along the outer periphery of the side surface of the battery pack 12. As shown in FIG. 3, the battery pack frame 14 includes a front member 40 located in the front, a rear member 44 located in the rear, a side member 42 located on the right side in the vehicle traveling direction, and a left side in the vehicle traveling direction The side members 46 located on the side of the battery pack 12 surround the periphery of the side of the battery pack 12. The battery pack 12 is attached to the battery pack frame 14 on four sides (front, rear, left, and right) of the periphery.

  As shown in FIG. 6, the battery pack frame 14 has a height enough to cover the lower part of the side portions of the battery pack 12. Further, the cross section of the battery pack frame 14 has a hollow closed cross section. Further, the shape of the closed cross section of the battery pack frame 14 is L-shaped, with the upper surface on the outer side in the vehicle width direction being high and the inner upper surface being low.

  Furthermore, at the lower end portion of the battery pack frame 14 on the outer side in the vehicle width direction, a flange 48 extending toward the outer side in the vehicle width direction is provided. The flange 48 is provided around the entire circumference of the battery pack frame 14, and the flange 48 extends in the front of the vehicle in the front member 40 and in the rear of the rear member 44 in the rear.

  A step is provided in the upper part of the inner periphery of the battery pack frame 14. Specifically, a step 49 is provided in which the upper surface on the inner side in the vehicle width direction of the battery pack frame 14 is one step lower than the upper surface on the outer side in the vehicle width direction. In addition, the flange 28 of the battery pack 12 is arrange | positioned through the member which is not shown in figure on the upper surface of this step part 49. As shown in FIG.

  FIG. 3 shows the configuration of the battery pack frame 14 and the under-reinforcement 18 (hereinafter referred to as “reinforcement 18” as appropriate). Under-reinforcements 18 are disposed on top of the left and right side members 42 and 46 of the battery pack frame 14 respectively. The under-reinforcement 18 extends from a portion of the side members 42, 46 of the battery pack frame 14 in the vehicle longitudinal direction along the respective side members 42, 46.

  Ends on the vehicle front side of the under-reinforcement 18 are respectively connected to front side members (not shown) located in front of the vehicle. The under-reinforcement 18 is bent inward in the vehicle width direction near the top of the front member 40 of the battery pack frame 14.

  Further, as shown in FIG. 6, the cross section of the under-reinforcement 18 has an open cross-sectional shape having an opening in the upward direction. Further, the opening of the open cross section is provided with a flange 82 extending outward and inward in the vehicle width direction.

  FIG. 5 is a bottom view of the battery pack protection structure 10 according to the present embodiment. The under reinforcement 18 and the connection brace 22 shown in FIG. 1 are omitted in this drawing. As shown in FIG. 5, a plurality of battery pack under braces 16 (hereinafter appropriately referred to as “under braces 16”) are disposed on the lower surface side of left and right side members 42 and 46 of battery pack frame 14. ing. Each under brace 16 is disposed with the vehicle width direction as the longitudinal direction so as to be bridged between the left and right side members 42 and 46 of the battery pack frame 14. Each under brace 16 is configured as a long member having a hat-shaped cross section, and has a pair of front and rear flanges 68 extending toward the vehicle front side and the vehicle rear side. A battery pack formed in a rectangular frame shape by joining a pair of front and rear flanges 68 located at both ends in the longitudinal direction of the under brace 16 to the lower surface of the flange 48 of the battery pack frame 14 by joining means such as welding. A ladder-like bone is passed through the frame 14 to reinforce the battery pack frame 14 itself, and the supporting surface of the battery pack 12 is reinforced. In the present embodiment, five under braces 16 are disposed at predetermined intervals in the vehicle longitudinal direction. For convenience of explanation, they are referred to as under braces 61, 62, 63, 64, 65 in order from the front of the vehicle.

  In the present embodiment, reinforcing members 24R and 24L are disposed between the under brace 61 disposed on the most front side and the front member 40 of the battery pack frame 14. The reinforcing members 24R and 24L are configured as long members having a hat-shaped cross-sectional shape, and have a pair of left and right flanges 92 extending outward in the vehicle width direction.

  Further, in the present embodiment, the reinforcing members 24R and 24L are also disposed between the under brace 65 installed closest to the rear and the rear member 44 of the battery pack frame 14. The reinforcing members 24R and 24L are configured as long members having a hat-shaped cross section. Further, a flange 92 extending outward in the vehicle width direction is provided at the upper end of the open cross section of the reinforcing members 24R, 24L.

(Action and effect)
Next, the operation and effects of the present embodiment will be described.

  First, the action and effect when the side surface of the vehicle collides will be described using FIG. When the barrier 99 collides with the right side surface of the vehicle, the collision load F is input to the locker 26 on the right side of the vehicle. Thereby, the locker 26 that has received the collision load F is deformed and moved inward in the vehicle width direction. Since the under reinforcement 18 is indirectly joined to the locker 26 via the floor panel 20, a part of the collision load F input to the locker 26 is transmitted to the under reinforcement 18. Since the side members 42 of the battery pack frame 14 are disposed immediately below the under-reinforcement 18 and both are joined by bolting or the like, the collision load F transmitted to the under-reinforcement 18 is on the right side of the vehicle. It will be transmitted to the side member 42. Further, the side member 42 on the right side of the vehicle and the side member 46 on the left side of the vehicle are connected in the vehicle width direction by the under brace 16. For this reason, the collision load F transmitted to the side member 42 on the right side of the vehicle on the collision side is transmitted to the side member 46 on the left side of the vehicle on the collision side via the under brace 16. Thus, the collision load F is dispersed and transmitted from the collision side to the anti-collision side.

  A part of the collision load F transmitted to the under-reinforcement 18 is dispersed to a front side member (not shown) attached to the tip of the under-reinforcement 18. In addition, the other part of the load input to the under-reinforcement 18 is distributed to the front member 40 and the back member 44 of the battery pack frame 14 mounted under the under-reinforcement 18. It is transmitted.

  As described above, according to the battery pack protection structure 10 according to the present embodiment, the collision load F input from the side of the vehicle is dispersed and transmitted from the collision side to the anti-collision side, bypassing the battery pack 12 . As a result, the battery pack 12 is effectively protected from the impact in the side collision. Further, by preventing the battery pack 12 from being deformed or damaged, the safety at the time of a collision of the vehicle is improved.

  According to the configuration according to the present embodiment, components such as the battery pack frame 14, the under reinforcement 18, and the under brace 16 are disposed at positions along the outer periphery of the battery pack 12. According to such a configuration, the battery pack 12 can be effectively protected without providing a large space for deformation of the component due to a collision. By thus omitting the space for deformation of the component, a large space for the battery pack 12 can be secured. By mounting the large battery pack 12, the range in which the vehicle can travel can be extended.

  According to the configuration according to the present embodiment, the battery pack 12 can be effectively protected even in the event of a collision from the front or the rear of the vehicle. In the event of a collision from the front or rear of the vehicle, parts (front or rear suspension member (not shown) etc.) disposed on the front and rear of the battery pack 12 deform and move, and the front member 40 or rear of the battery pack frame 14 Interference (contact) the member 44. Thereby, the front member 40 or the rear member 44 receives a load toward the battery pack 12 inside the vehicle.

  For example, the loaded front member 40 or rear member 44 transfers a part of the load via the side members 42, 46 to the anti-collision rear member 44, bypassing the battery pack 12. Thereby, the load transmitted to the battery pack 12 can be reduced, and deformation and breakage of the battery pack can be prevented.

  Moreover, according to the structure which concerns on this embodiment, the connection brace 22 also has a role which protects the battery pack 12 from the load by a collision. For example, at the time of a side collision of the vehicle, the locker 26 deforms and moves to interfere with the connection brace 22 to transmit the load. In this case, the connection brace 22 distributes the load to the attached sheet and floor panel 20. Furthermore, the connecting brace 22 also disperses part of the load to the anti-collision under-reinforcement and the side members 42, 46 of the battery pack frame, as the under brace 16 does. Thereby, the load transmitted to the battery pack 12 can be reduced.

  As mentioned above, although the battery pack protection structure 10 which concerns on embodiment was demonstrated, of course in the range which does not deviate from the summary of this invention, it can implement in a various aspect. For example, in FIG. 6, the cross section of the under-reinforcement 18 has an open cross-sectional shape, but may have a closed cross-sectional shape. Although the cross sections of the battery pack frame 14 and the connection brace 22 have a closed cross section, they may have an open cross section having an opening in any direction.

  Also, for example, although the battery pack frame 14 is shown as an integral part, it may be a combination of separately provided side members 42 and 46, the front member 40, and the rear member 44. .

DESCRIPTION OF SYMBOLS 10 battery pack protection structure 12 battery pack 14 battery pack frame 16 battery pack under brace (brace)
18 Under Reinforcement 61 Under Brace 62 Under Brace 63 Under Brace 64 Under Brace 65 Under Brace

Claims (1)

A battery pack located under the floor of the vehicle,
A battery pack frame disposed so as to surround the side surface of the battery pack and supporting the battery pack;
A pair of left and right under reinforcements that extend in the vehicle longitudinal direction on the outer side in the vehicle width direction of the battery pack and are joined to the battery pack frame,
A brace that couples one side and the other side in the vehicle width direction of the battery pack frame in the vehicle width direction;
Battery pack protection structure for vehicles equipped with.