JP5617492B2 - Battery mounting structure for vehicles - Google Patents

Description

  The present invention relates to a vehicle battery mounting structure.

  A battery unit mounted on the front side in the vehicle front-rear direction of a motor (drive source) at the rear of the vehicle is known (for example, Patent Document 1). In the technique described in Patent Document 1, a motor that moves forward in the vehicle front-rear direction at the time of a vehicle rear-side collision (rear collision) interferes with the battery case at the rear end in the vehicle front-rear direction of the battery case that houses the battery. The battery protector which suppresses is attached.

JP 2009-87774 A

  However, in the technique described in Patent Document 1, when a member such as a motor that has moved forward in the vehicle front-rear direction collides with the battery protector, the battery protector may be bent and deformed (buckled), and so on. There is room for improvement in order to suppress the motor interference with respect to the motor.

  An object of the present invention is to provide a vehicle battery mounting structure capable of improving the suppression effect of suppressing a member arranged on the rear side in the vehicle longitudinal direction of the battery from interfering with the battery at the time of a vehicle rear surface collision.

The battery mounting structure for a vehicle according to claim 1 is attached to a vehicle under the floor and supports a battery, and is provided in the battery frame, and a longitudinal direction is arranged in the vehicle width direction on the rear side in the vehicle front-rear direction of the battery. And a first rear wall portion provided with a vertical bead extending in the vehicle up-down direction, and a longitudinal direction arranged in the vehicle width direction, overlapping the first rear wall portion from the vehicle front-rear direction rear side. And a second rear wall portion provided with a lateral bead extending in the vehicle width direction, and an intermediate between the stacked first rear wall portion and second rear wall portion in the vehicle width direction. Bulging portions that bulge in a convex shape toward the rear side in the vehicle front-rear direction are provided at the respective portions, and the vertical beads are provided at corners on both sides in the vehicle width direction of the bulging portion in the first rear wall portion, respectively. It has been .

  According to the first aspect of the present invention, the battery frame is provided with the first rear wall portion that is arranged with the longitudinal direction being the vehicle width direction. A second rear wall portion disposed with the longitudinal direction set to the vehicle width direction is overlapped and joined to the first rear wall portion from the rear side in the vehicle front-rear direction. By disposing these first rear wall portion and second rear wall portion on the rear side in the vehicle front-rear direction of the battery, a member (hereinafter referred to as “moving member”) disposed on the rear side in the vehicle front-rear direction of the battery frame at the time of a rear collision. ") May interfere with the battery.

Further, by providing a vertical bead on the first rear wall portion, the bending rigidity (around the axis in the vehicle width direction) of the first rear wall portion is increased. In addition, by providing a lateral bead on the second rear wall, the bending rigidity (around the vehicle vertical axis) of the second rear wall is increased, and the tensile force in the vehicle width direction is increased in the vehicle width direction. It becomes possible to resist while stretching. Therefore, for example, when a moving member that has moved to the front side in the vehicle front-rear direction due to a rear collision collides with the second rear wall portion, the lateral bead is against the tensile force in the vehicle width direction that acts on the second rear wall portion. Resists while extending in the vehicle width direction. Thereby, impact energy is absorbed. Thereafter, when the moving member further moves to the front side in the vehicle front-rear direction, the movement of the moving member to the front side in the vehicle front-rear direction is restricted by the first rear wall portion whose bending rigidity is increased by the vertical bead.

Furthermore, by providing the bulging portion on the first rear wall portion and the second rear wall portion, the moving member easily collides with the corner portion of the bulging portion of the second rear wall portion. In this case, the movement of the moving member in the vehicle front-rear direction is restricted by the corners of the bulging portions of the first rear wall portion and the second rear wall portion. Accordingly, by reinforcing (stiffening) the corner of the bulging portion of the first rear wall portion with the vertical bead, the restriction effect on the movement of the moving member toward the front side in the vehicle front-rear direction is improved. Moreover, the processing cost of the 1st back wall part can be reduced by locally reinforcing the 1st back wall part with a vertical bead.

The vehicle battery mounting structure according to claim 2 is the vehicle battery mounting structure according to claim 1 , wherein the vehicle battery mounting structure is attached to a vehicle body on at least one of the first rear wall portion and the second rear wall portion. Is provided.

According to the invention which concerns on Claim 2 , the vehicle body attaching part provided in at least one of the 1st rear wall part and the 2nd rear wall part is attached to a vehicle body. Thereby, since the collision load acting on the first rear wall portion and the second rear wall portion is transmitted to the vehicle body, the burden load on the first rear wall portion and the second rear wall portion is reduced. Therefore, the thickness of the first rear wall portion and the second rear wall portion can be kept small.

According to a third aspect of the present invention, there is provided the vehicle battery mounting structure according to the first or second aspect , wherein the battery frame extends in the vehicle width direction and connects a pair of left and right rear suspensions. It arrange | positions at the vehicle front-back direction front side of a beam, and the said 1st rear wall part and the said 2nd rear wall part are arrange | positioned between the said battery and the said connection beam.

According to the invention which concerns on Claim 3 , a 1st back wall part and a 2nd back wall part are arrange | positioned between a battery and a connection beam. Therefore, the suppression effect which suppresses that a connection beam interferes with a battery at the time of a rear collision can be improved.

  As described above, according to the vehicle battery mounting structure of the present invention, it is possible to improve the suppression effect of suppressing the member arranged on the rear side in the vehicle front-rear direction of the battery from interfering with the battery at the time of a vehicle rear surface collision. .

It is the side view which looked at the vehicle to which the battery mounting structure for vehicles which concerns on 1st Embodiment of this invention was applied from the vehicle width direction outer side. It is the plane sectional view which looked at the vehicle longitudinal direction rear part of the battery frame concerning a 1st embodiment of the present invention from the vehicle up-and-down direction upper side. It is the perspective view which looked at the 1st board member and the 2nd board member concerning a 1st embodiment of the present invention from the vehicles up-and-down direction upper part back. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. (A) is sectional drawing along the vehicle width direction of the 1st board member which concerns on 1st Embodiment of this invention, (B) is the vehicle up-down direction of the 2nd board member which concerns on 1st Embodiment of this invention. FIG. It is sectional drawing equivalent to FIG. 4 which shows the 1st board member and 2nd board member which concern on 2nd Embodiment of this invention. It is the perspective view which looked at the 1st board member and the 2nd board member concerning a 2nd embodiment of the present invention from the vehicles up-and-down direction upper part back. It is sectional drawing equivalent to FIG. 8 which shows the modification of the 1st board member which concerns on 2nd Embodiment of this invention, and a 2nd board member.

  Hereinafter, a vehicle battery mounting structure according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that the arrow FR shown as appropriate in each figure indicates the front side in the vehicle front-rear direction, the arrow UP indicates the upper side in the vehicle vertical direction, and the arrow RH indicates the vehicle width direction outside (right side).

  First, the vehicle battery mounting structure according to the first embodiment will be described.

  FIG. 1 is a side view showing a vehicle 12 to which a vehicle battery mounting structure 10 according to the present embodiment is applied. FIG. 2 shows a vehicle with a battery frame 16 that supports a battery pack 14 as a battery. The rear part in the front-rear direction is shown by a cross-sectional view.

  As shown in FIG. 1, a vehicle 12 is an electric vehicle that runs using an electric motor (motor, not shown) mounted on the front of the vehicle as a drive source, and a battery in which electric power to be supplied to the electric motor is stored under the floor. A pack 14 is mounted. In this way, the vehicle battery mounting structure 10 according to the present embodiment is mounted on the vehicle 12 in which the battery pack 14 is mounted below the floor of the vehicle 12, in other words, below the floor panel 52 (see FIG. 4) to be described later. Has been applied.

  As shown in FIG. 2, the vehicle battery mounting structure 10 includes a battery frame 16 that supports the battery pack 14 from the lower side in the vehicle vertical direction. The battery pack 14 is a case in which a plurality of rechargeable storage batteries (not shown) are housed in a case. In FIG. 2, the outer shape of the battery pack 14 is indicated by a two-dot chain line. The battery pack 14 is placed on the battery frame 16 and is fixed to the battery frame 16 with bolts or the like (not shown).

  The battery frame 16 includes a pair of left and right battery side members 18 extending in the vehicle front-rear direction and a battery cross member (illustrated) that extends in the vehicle width direction and connects a front end portion and an intermediate portion of the pair of left and right battery side members 18 in the vehicle front-rear direction. A backboard 20 extending in the vehicle width direction and connecting the rear end portions of the pair of left and right battery side members 18 in the vehicle front-rear direction, and connecting the backboard 20 and the battery cross member extending in the vehicle front-rear direction. The battery under member 22 is configured.

An intermediate beam (connection beam) 24 that connects the suspension arms of a pair of left and right rear suspensions (not shown) is disposed on the rear side of the battery frame 16 in the vehicle front-rear direction. In other words, the battery frame 16 is disposed on the front side in the vehicle front-rear direction of the intermediate beam 24 as the moving member. The intermediate beam 24 has an open cross-sectional structure with an inverted V-shaped cross section that is open at the lower side in the vehicle vertical direction.
In FIG. 2, as an example, a state in which the intermediate beam 24 has moved forward in the vehicle front-rear direction with a predetermined angle (intrusion angle) θ with respect to the backboard 20 due to a rear collision or the like is a two-dot chain line. It is shown.

  The backboard 20 is provided at an end of the battery frame 16 on the rear side in the vehicle front-rear direction, and is disposed along the vehicle width direction. The backboard 20 is disposed between the battery pack 14 and the intermediate beam 24 described above, and interference of the intermediate beam 24 with respect to the battery pack 14 is suppressed by the backboard 20.

  As shown in FIG. 3, the backboard 20 includes a first board member 30 as a first rear wall portion and a second board member 40 as a second rear wall portion. A second board member 40 is stacked on the first board member 30 from the rear side in the vehicle front-rear direction, and is appropriately joined by welding or the like. As shown in FIG. 4, the first board member 30 and the second board member 40 are L-shaped metal plates whose cross-sectional shapes viewed from the vehicle width direction are reversed left and right, and the battery pack 14 is rearward in the vehicle front-rear direction. , And lower wall portions 34 and 44 extending from the end of the upright wall portions 32 and 42 to the front side of the vehicle front-rear direction.

As shown in FIG. 3, the vehicle width direction intermediate portions of the standing wall portions 32 and 42 of the first board member 30 and the second board member 40 are rearward in the vehicle front-rear direction with respect to the wall main body portions 32A and 42A. The bulging portions 32B and 42B that bulge in a convex shape are provided. In addition, a pair of left and right bracket mounting portions 46 that are recessed from the wall main body portion 42 </ b> A to the front side in the vehicle front-rear direction are provided at the vehicle width direction outside portion of the standing wall portion 42 of the second board member 40. As shown in FIG. 5, one end of a vehicle body mounting bracket 50 as a vehicle body mounting portion is joined to the bracket mounting portion 46 by welding or the like. The other end of the vehicle body mounting bracket 50 is fastened to a vehicle body side bracket 54 provided on the lower surface of the floor panel 52 of the vehicle body by vehicle body fastening bolts 56 and nuts 58. As a result, the outer side of the backboard 20 in the vehicle width direction is connected to the floor panel 52.
The vehicle body mounting bracket 50 may be provided on the standing wall portion 32 of the first board member 30.

  A mounting bracket 60 provided at the rear end of the battery pack 14 in the longitudinal direction of the battery pack 14 and a collar 62 as a spacer are fastened together with a vehicle body fastening bolt 56 to the vehicle body side bracket 54. Furthermore, the lower wall parts 34 and 44 of the 1st board member 30 and the 2nd board member 40 are couple | bonded by the edge part of the vehicle front-back direction front side, and comprise the closed cross section.

  Here, as shown in FIG. 3, the standing wall portion 32 of the first board member 30 includes a plurality of (in this embodiment, extending in the vehicle vertical direction from the lower end in the vehicle front-rear direction to the upper end of the standing wall portion 32. Four) vertical beads (first beads) 36, 38 are provided. As shown in FIG. 6A, the vertical beads 36 are provided at the corners 32B1 on both sides of the bulging portion 32B in the vehicle width direction, and the cross-sectional shape seen from the vehicle vertical direction protrudes rearward in the vehicle front-rear direction. It is a triangular shape. The vertical bead 38 is provided on the main body 32A on both sides of the bulging portion 32B in the vehicle width direction, and has a trapezoidal shape in which the cross-sectional shape seen from the vehicle width direction is convex rearward in the vehicle front-rear direction. Bending rigidity (around the axis in the vehicle width direction) is imparted to the standing wall portion 32 of the first board member 30 by the vertical beads 36 and 38.

  The arrangement of the vertical beads 36, 38 in the first board member 30 is such that the intermediate beam 24 is at a predetermined angle θ with respect to the backboard 20 in the front-rear direction of the vehicle (in the direction of the arrow FR), as indicated by a two-dot chain line in FIG. The position of the second board member 40 with which the intermediate beam 24 collides is set to a position where it can be supported.

  On the other hand, as shown in FIG. 3, the standing wall portion 42 of the second board member 40 includes a plurality of (two in this embodiment) extending in the vehicle width direction across the wall main body portion 42 </ b> A and the bulging portion 42 </ b> B. A lateral bead (second bead) 48 is provided. That is, the vertical wall 42 of the second board member 40 is provided with a horizontal bead 48 extending in a direction different from the vertical beads 36 and 38 provided on the vertical wall 32 of the first board member 30. Each horizontal bead 48 is provided across at least a pair of left and right bracket mounting portions 46 so as to intersect with the vertical beads 36 and 38 of the first board member 30 when viewed from the vehicle front-rear direction. Further, as shown in FIG. 6 (B), each lateral bead 48 is provided at an interval in the vehicle vertical direction, and a cross-sectional shape viewed from the vehicle width direction is convex rearward in the vehicle front-rear direction. It has a trapezoidal shape. By these lateral beads 48, bending rigidity (around the vehicle vertical axis) is imparted to the standing wall portion 42 of the second board member 40, and toughness (deformation performance) against a tensile force in the longitudinal direction (vehicle width direction). Has been granted.

  Next, the operation of the vehicle battery mounting structure according to the first embodiment will be described.

  As shown in FIG. 2, a backboard 20 is disposed between the battery pack 14 and the intermediate beam 24. The backboard 20 includes a first board member 30 and a second board member 40 that is stacked on the first board member 30 from the rear side in the vehicle front-rear direction. A bulge that bulges to the rear side in the vehicle front-rear direction with respect to the wall main body portions 32A and 42A is provided at the intermediate portion in the vehicle width direction of the standing wall portions 32 and 42 of these first board member 30 and second board member 40. Portions 32B and 42B are provided.

  Therefore, for example, when the intermediate beam 24 moves to the front side in the vehicle front-rear direction (arrow FR direction) with a predetermined angle θ with respect to the backboard 20 due to a rear collision or the like, the angle of the bulging portion 42B in the second board member 40 Colliding with the part 42B1. As a result, as shown by an arrow S in FIG. 4, the bulging portion 42B is tilted forward in the vehicle front-rear direction with the end portion on the vehicle vertical direction lower side as a fulcrum, and the standing wall portion 42 is deformed so as to be twisted as a whole ( Torsional deformation). As a result, a tensile force in the vehicle width direction acts on the standing wall portion 42.

  Here, a plurality of horizontal beads 48 extending in the vehicle width direction are provided on the standing wall portion 42 of the second board member 40. Therefore, when a tensile force in the vehicle width direction acts on the standing wall portion 42, each lateral bead 48 efficiently resists the tensile force while extending in the vehicle width direction. Thereby, impact energy is absorbed.

  When the intermediate beam 24 further moves forward in the front-rear direction of the vehicle, the corner portion 32B1 of the bulge portion 32B of the first board member 30 is rearward in the vehicle front-rear direction due to the corner portion 42B1 of the bulge portion 42B of the second board member 40. Is pressed. Here, a vertical bead 36 is provided at the corner portion 32B1 of the bulging portion 32B of the first board member 30, and the bending rigidity (around the axis in the vehicle width direction) is higher than other portions. Yes. By receiving the intermediate beam 24 at the corner portion 32B1 of the bulging portion 32B, the movement of the intermediate beam 24 to the front side in the vehicle front-rear direction is restricted.

  Furthermore, the vertical bead 38 is provided in wall main-body part 32A of the vehicle width direction both sides of the bulging part 32B. Accordingly, when the intermediate beam 24 further moves forward in the vehicle front-rear direction with rotation, the movement of the intermediate beam 24 in the vehicle front-rear direction front is restricted at two points, the vertical bead 36 and the vertical bead 38.

  As described above, in this embodiment, the impact energy of the intermediate beam 24 is absorbed by the second board member 40 provided with the horizontal beads 48, and then the intermediate is performed by the first board member 30 whose bending rigidity is increased by the vertical beads 36. By receiving the beam 24, the movement of the intermediate beam 24 forward in the vehicle front-rear direction can be restricted. Accordingly, it is possible to avoid the intrusion of the intermediate beam 24 into the battery frame 16 and improve the suppression effect of suppressing the interference of the intermediate beam 24 with the battery pack 14.

  Further, for example, in the configuration in which the vertical bead is provided on the standing wall portion 42 of the second board member 40, the vertical bead is subjected to a collision load of the intermediate beam 24 with a line, and therefore the local folding is likely to occur in the standing wall portion 42. On the other hand, in the configuration in which the vertical beads 36 and 38 are provided on the standing wall portion 32 of the first board member 30 as in the present embodiment, the standing wall portion 32 of the first board member 30 as a whole is the second board member 40. Since the impact load applied to the standing wall portion 42 is received, local bending of the standing wall portion 32 of the first board member 30 is unlikely to occur, and the rigidity of the standing wall portion 32 of the first board member 30 can be further increased.

  Further, the raised wall portions 32 and 42 of the first board member 30 and the second board member 40 are provided with bulging portions 32B and 42B that bulge rearward in the vehicle front-rear direction with respect to the wall main body portions 32A and 42A. By providing the vertical beads 36 and 38 on the corner portion 32B1 of the bulging portion 32B and the wall main body portion 32A of the board member 30, the intermediate beam 24 can be received at two points of the vertical beads 36 and 38, respectively. Therefore, the restriction effect on the forward movement of the intermediate beam 24 in the vehicle front-rear direction is improved.

  Furthermore, the portion where the intermediate beam 24 collides is limited by the bulging portions 32B and 42B, and the standing wall portion 32 is locally reinforced by the vertical beads 36 and 38, thereby reducing the processing cost of the first board member 30. be able to.

  Furthermore, a collision load acting on the first board member 30 and the second board member 40 by attaching the vehicle body mounting bracket 50 provided on the standing wall portion 42 to the second board member 40 to the vehicle body side bracket 54 of the floor panel 52. However, the load on the first board member 30 and the second board member 40 is reduced. Therefore, since the board thickness etc. of the 1st board member 30 and the 2nd board member 40 can be restrained small, cost reduction and weight reduction can be achieved.

  Next, a vehicle battery mounting structure according to the second embodiment will be described. In addition, about the structure similar to 1st Embodiment, a same sign is attached | subjected and description is abbreviate | omitted suitably.

  FIG. 7 shows a backboard 70 according to the second embodiment. The backboard 70 is disposed along the vehicle width direction, and is attached to the rear end of the battery frame 72 in the vehicle front-rear direction. The backboard 70 is disposed between the battery pack 14 and the intermediate beam 24, and the interference of the intermediate beam 24 with the battery pack 14 is suppressed by the backboard 70.

  As shown in FIG. 8, the backboard 70 includes a first board member 80 as a first rear wall portion and a second board member 90 as a second rear wall portion. A second board member 90 is stacked on the first board member 80 from the rear side in the vehicle front-rear direction, and is appropriately joined by welding or the like. The 1st board member 80 and the 2nd board member 90 are comprised by the flat metal plate. The first board member 80 includes a plurality of (two in this embodiment) vertical beads (first beads) 82 extending in the vehicle vertical direction from the lower end to the upper end of the first board member 80 in the vertical direction of the vehicle. Are provided at intervals in the vehicle width direction. Each vertical bead 82 has a trapezoidal shape in which the shape seen from the vehicle vertical direction is convex forward in the vehicle front-rear direction. By these vertical beads 82, bending rigidity (around the axis in the vehicle width direction) is imparted to the first board member 80.

  The second board member 90 is provided with a plurality of (two in the present embodiment) horizontal beads (second beads) 92 extending in the vehicle width direction at intervals in the vehicle vertical direction. That is, the second board member 90 is provided with a horizontal bead 92 extending in a different direction from the vertical bead 82 provided on the first board member 80. Each lateral bead 92 is provided over the entire length in the vehicle width direction, and a cross-sectional shape viewed from the vehicle width direction is a trapezoidal shape that protrudes forward in the vehicle front-rear direction. By these lateral beads 92, the second board member 90 is provided with bending rigidity (around the vehicle vertical axis) and toughness (deformation performance) against the tensile force in the longitudinal direction (vehicle width direction). .

  Further, a plurality of frame mounting portions 84 and 94 projecting downward in the vehicle vertical direction are provided at the ends of the first board member 80 and the second board member 90 on the vehicle vertical direction lower side. These frame attaching portions 84 and 94 are provided at intervals in the vehicle width direction, and are superimposed on the battery rear cross member 74 (see FIG. 7) from the rear side in the vehicle front-rear direction. The battery rear cross member 74 extends in the vehicle width direction and constitutes the rear part of the battery frame 72 in the vehicle front-rear direction. The battery rear cross member 74 and the frame mounting portions 84 and 94 are respectively formed with bolt mounting holes. The battery rear cross member is formed by frame fastening bolts 76 and weld nuts 78 penetrating the bolt mounting holes. Each frame attaching portion 84, 94 is fastened to 74.

  On the other hand, a plurality of vehicle body mounting portions 86 and 96 projecting upward in the vehicle vertical direction are provided at the ends of the first board member 80 and the second board member 90 on the vehicle vertical direction upper side. These vehicle body mounting portions 86 and 96 are provided at intervals in the vehicle width direction, and overlapped with the vehicle body side bracket 55 provided on the floor panel 52 from the rear side in the vehicle front-rear direction. Bolt mounting holes are respectively formed in the vehicle body mounting portions 86 and 96 and the vehicle body side bracket 55, and each of the vehicle body mounting portions 86 and 96 is formed by the vehicle body fastening bolts 64 and the weld nuts 66 that pass through these bolt mounting holes. Is fastened to the vehicle body side bracket 54.

  The vehicle body attachment portions 86 and 96 may be provided on at least one of the first board member 80 and the second board member 90.

  Next, the operation of the vehicle battery mounting structure according to the second embodiment will be described.

  As shown in FIG. 6, a backboard 70 is disposed between the battery pack 14 and the intermediate beam 24. The backboard 70 includes a first board member 80 and a second board member 40 that is stacked on the first board member 80 from the rear side in the vehicle front-rear direction. The first board member 80 is provided with a vertical bead 82, and the second board member 90 is provided with a horizontal bead 92.

  By providing the horizontal bead 92 on the second board member 90 in this manner, the second board member 90 resists the tensile force in the vehicle width direction while extending. Further, by providing the vertical bead 82 on the first board member 80, the bending rigidity (around the axis in the vehicle width direction) of the first board member 80 is increased. Accordingly, when the intermediate beam 24 moved to the front side in the vehicle front-rear direction due to a rear collision or the like collides with the backboard 70, the impact energy is absorbed by the second board member 90, and then the bending rigidity is increased. The board member 80 restricts the movement of the intermediate beam 24 toward the front side in the vehicle front-rear direction. Accordingly, it is possible to avoid the intrusion of the intermediate beam 24 into the battery frame 16 and improve the suppression effect of suppressing the interference of the intermediate beam 24 with the battery pack 14.

  Further, in the present embodiment, the structure of the backboard 70 can be simplified by configuring the backboard 70 and the battery rear cross member 74 that ensures the rigidity of the battery frame 72 in the vehicle width direction as separate bodies. it can. Therefore, the processing cost of the backboard 70 can be reduced. On the other hand, in 1st Embodiment mentioned above, as FIG. 4 shows, the lower wall parts 34 and 44 of the 1st board member 30 and the 2nd board member 40 are the edge parts of each vehicle front-back direction front side. By being combined to form a closed cross section, the rigidity of the battery frame 16 in the vehicle width direction is ensured. In this configuration, the structure of the backboard 70 is complicated, but the number of parts is reduced, so that the assembly cost can be reduced.

  In the present embodiment, the frame attaching portions 84 and 94 (see FIG. 8) are provided at the lower ends of the first board member 80 and the second board member 90 in the vehicle vertical direction. For example, FIG. As in the first embodiment, the first board member 80 and the second board member 90 are formed in an L-shaped cross-section that is reversed left and right, and the battery rear cross member 74 (see FIG. 7) is omitted. It is also possible. In this case, although not shown, the lower wall portions 80A and 90A of the first board member 80 and the second board member 90 may form a closed cross section to ensure rigidity in the vehicle width direction as necessary. In the configuration shown in FIG. 9, three horizontal beads 92 are provided on the second board member 90.

  In the first and second embodiments, a vertical bead is provided on the first board member as the first rear wall portion, and a horizontal bead is provided on the second board member as the second rear wall portion. Not exclusively. The first board member and the second board member only need to be provided with beads extending in different directions. For example, the first board member is provided with a vertical bead and the second board member is inclined with respect to the vehicle width direction. An inclined bead may be provided, or an inclined bead that is inclined with respect to the vehicle width direction so as to intersect with each other may be provided on each of the first board member and the second board member. In this way, by providing beads extending in different directions on the first wall portion and the second wall portion, the first wall portion can be selected according to the shape of the intermediate beam 24 and the angle of penetration of the intermediate beam 24 with respect to the backboards 20 and 70. And the rigidity of a different direction can be provided to each of a 2nd wall part. Thereby, the movement of the intermediate beam 24 to the front side in the vehicle front-rear direction can be restricted. Further, at least a part of the first board member and the second board member may be provided with beads extending in different directions. For example, a vertical bead and a horizontal bead are provided on each of the first board member and the second board member. Both may be provided. Furthermore, the shape, number, and arrangement of the beads can be changed as appropriate.

  Further, the backboard is configured by stacking the two board members of the first board member and the second board member, but the backboard may be configured by stacking three or more board members. Further, for example, when a backboard is configured by stacking three board members, each board member may be provided with a vertical board, a horizontal bead, and a horizontal bead sequentially from the front side in the vehicle front-rear direction. A horizontal bead, a vertical board, and a horizontal bead may be formed in this order. Further, the battery frame may be provided with a plurality of backboards arranged in the vehicle width direction.

  The shape of the battery frame is not limited to the above. The battery frame is not particularly limited as long as it is attached under the floor of the vehicle 12 and can support the battery pack 14. For example, a plurality of longitudinal members may be connected in a lattice shape.

  Furthermore, the first and second embodiments can be applied to, for example, an electric vehicle or a hybrid vehicle in which a battery is mounted on the front side in the vehicle front-rear direction of members such as a motor (drive source) and a frame that supports the motor. is there. Particularly, in the first and second embodiments, like the intermediate beam 24, the second board member 40 is bent or twisted, and the second board member 40 generates a tensile force in the vehicle width direction. It is effective against.

  Although the first and second embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and the first and second embodiments may be used in combination. Needless to say, the present invention can be implemented in various forms without departing from the scope of the invention.

10. Vehicle battery mounting structure 14 Battery pack (battery)
16 Battery frame 24 Intermediate beam (connected beam)
30 First board member (first rear wall)
32B bulging portion 32B1 corner portion 36 vertical bead (first bead)
38 Vertical bead (first bead)
40 Second board member (second rear wall)
42B bulge 48 side bead (second bead)
50 Car body mounting bracket (car body mounting part)
52 Floor panel (car body)
72 battery frame 80 first board member (first rear wall)
82 Vertical bead (first bead)
86 Car body mounting part 90 Second board member (second rear wall part)
96 Car body mounting portion 92 Horizontal bead (second bead)

Claims (3)

A battery frame mounted under the floor of the vehicle and supporting the battery;
A first rear wall provided on the battery frame, disposed on the rear side of the battery in the vehicle longitudinal direction with the longitudinal direction being the vehicle width direction, and provided with a vertical bead extending in the vehicle vertical direction ;
A second rear wall portion that is disposed with the longitudinal direction being the vehicle width direction and is overlapped and joined to the first rear wall portion from the rear side in the vehicle front-rear direction, and provided with a lateral bead extending in the vehicle width direction ;
With
A bulging portion that bulges convexly rearward in the vehicle front-rear direction is provided in the vehicle width direction intermediate portion of the overlapped first rear wall portion and second rear wall portion, respectively.
The vehicle battery mounting structure in which the vertical beads are respectively provided at corners on both sides in the vehicle width direction of the bulge portion in the first rear wall portion . The vehicle battery mounting structure according to claim 1, wherein a vehicle body attachment portion attached to a vehicle body is provided on at least one of the first rear wall portion and the second rear wall portion. The battery frame extends in the vehicle width direction and is disposed on the front side in the vehicle front-rear direction of a connecting beam that connects a pair of left and right rear suspensions,
The vehicle battery mounting structure according to claim 1 or 2, wherein the first rear wall portion and the second rear wall portion are disposed between the battery and the connection beam.

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