JP3880916B2 - Body mounting structure of power storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body mounting structure for a power storage device.
[0002]
[Prior art]
Some vehicles having a driving motor, such as a hybrid vehicle and an electric vehicle, are equipped with a high-voltage driving power storage device to drive the driving motor (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 11-195437
[Problems to be solved by the invention]
By the way, since the high-voltage power storage device as described above is relatively large, when the power storage device is mounted, for example, the vehicle interior can be erected along the rear seat on the rear side of the rear seat. It is necessary to ensure space efficiency. When performing such an arrangement, it is possible to adopt a structure in which the power storage device main body is supported on the support plate and this support plate is fixed to the vehicle body side via the mounting bracket, but in that case, the mounting bracket and the support plate are In addition to supporting the power storage device body, it is necessary to receive the force applied in the event of a vehicle collision. For this purpose, it is necessary to use a high-strength material or a thick plate as the mounting bracket and the support plate, which causes an increase in cost and weight.
[0005]
Therefore, an object of the present invention is to provide a vehicle body mounting structure for a power storage device that can suppress an increase in cost and can be reduced in weight.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that a pair of upper and lower support plates (for example, the bus bar plate 30 in the embodiment) supporting the power storage device body (for example, the assembled battery 52 in the embodiment) The mounting brackets are held in contact with and separated from the front and rear sides , and the upper pair of mounting brackets (for example, the mounting brackets 54 and 55 in the embodiment) have upper cross members (for example, the rear pillar cross in the embodiment). A pair of upper mounting portions (for example, mounting portions 24a and 24b in the embodiment ) to be attached to the member 14) are integrally formed, and fixed so that the upper pair of mounting portions overlap each other from a state in which the support plate is sandwiched. to one, it mounted in a pair of mounting brackets (e.g. the embodiment of the lower bracket 27a in a pair of mounting portions (e.g. the embodiment of the install them lower the floor cross member 10) in the lower cross member (e.g. embodiment the 56, 57), 27b) are integrally formed, the support plate The upper and lower mounting brackets (for example, the mounting bracket 54 in the embodiment) on the opposite side of the power storage device main body of the support plate are fixed so that the pair of mounting portions on the lower side of the previous period overlap each other. , 56) are connected to each other via a unit box (for example, the exterior box 60 in the embodiment).
[0007]
Thus, a pair of mounting brackets that support the upper part of the support plate are sandwiched between the support plates and are fixed to the upper cross member, and a pair of mounting brackets that support the lower part of the support plate. Since the support plate is sandwiched and fixed to the lower cross member, it is possible to receive the force applied in the event of a vehicle collision without using a high-strength material or a thick plate as the mounting bracket. . In addition, since the upper and lower mounting brackets on the opposite side to the power storage device body of the support plate are connected via the unit box, the support plate is reinforced by the connected upper and lower mounting brackets and the unit box. As a result, the force applied at the time of the vehicle collision can be received without using a high-strength material or a thick plate as the support plate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A vehicle body mounting structure for a power storage device according to an embodiment of the present invention will be described below with reference to the drawings. In the following description, front, rear, left and right are front, rear, left and right with respect to the vehicle traveling direction.
[0009]
The vehicle body mounting structure of the power storage device of the present embodiment is applied to an automobile that drives a travel drive motor with a high-voltage power supply, specifically, a hybrid vehicle. In this hybrid vehicle, when an electric power is supplied from a high-voltage traveling power storage device having a built-in power storage device body such as a capacitor of a DC power supply to a traveling drive motor, the inverter converts the direct current to alternating current, and the vehicle motion When a part of the energy is stored in the power storage device via the driving motor, the inverter converts the alternating current into a direct current and stores it.
[0010]
As shown in FIGS. 1 to 3, the front portion of the rear floor 1 is stepped on the front side downward, and a rear edge portion of a floor panel (not shown) is joined to the front edge portion of the rear floor 1. ing. A rear frame 2 is joined to the lower surfaces of both sides of the rear floor 1 along the longitudinal direction of the vehicle body, and a cross-sectional structure surrounded by the rear frame 2 and the rear floor 1 forms a vehicle body skeleton K1.
[0011]
A cross member 4 having an L-shaped cross section is joined to the back side of the stepped portion 3 at the front portion of the rear floor 1 so as to straddle the rear frame 2 along the vehicle width direction, and is surrounded by the cross member 4 and the rear floor 1. The cross-sectional structure portion constitutes the vehicle body skeleton portion K2.
[0012]
A reinforce 5 having a substantially L-shaped cross section made of a plate material thicker than the rear floor 1 is provided on the stepped portion 3 so as to cover the stepped portion 3 from above in the vehicle width direction so as to straddle the arrangement portion of the rear frame 2. It is provided along and is joined to the rear floor 1 by welding. The cross member 4 is reinforced by the reinforcement 5. Two front mounting holes 7 for the rear seat 6 are provided on the upper surface of the reinforcement 5 corresponding to each rear seat 6.
[0013]
As shown in FIGS. 2 and 3, an inner panel 9 of a wheel house is joined to the flange portions 8 on both sides of the rear floor 1 to form a wheel house together with an outer panel (not shown).
[0014]
A floor cross member 10 having a U-shaped cross-section is joined to the upper surface of the rear floor 1 between the inner panels 9 of the wheel house behind the reinforcement 5 so as to straddle the rear frame 2 in the vehicle width direction. A closed cross-section structure portion advantageous in strength is formed at this portion. A rear mounting hole 11 of the rear seat 6 is provided at a position corresponding to the front mounting hole 7 on the upper surface of the floor cross member 10.
[0015]
A rear seat 6 indicated by a chain line in FIG. 1 is fixed to a front mounting hole 7 of the rear seat 6 of the reinforcement 5 and a rear mounting hole 11 of the rear seat 6 of the floor cross member 10. Here, on the floor cross member 10, lower anchors 12 that support a child seat (not shown) are attached to each rear seat 6 at two locations. The lower anchor 12 is composed of an anchor bracket 12a and an annular member 12b joined to the floor cross member 10.
[0016]
A rear pillar cross member 14 having a closed cross-sectional structure is provided along the vehicle width direction at the upper rear of the rear seat 6. The rear pillar cross member 14 is formed by joining a front side member 15 and a rear side member 16 having an L-shaped cross section, and both end portions are formed to be inclined slightly downward. As shown in FIG. 3, upper anchors 21 are respectively attached to the rear surfaces of the rear pillar cross members 14 corresponding to the lower anchors 12 and 12 of the child seat.
[0017]
Each end portion of the rear pillar cross member 14 is joined to an inner panel (not shown) of the rear fender, and the upper portion of the bracket 18 is fixed to the end portions by bolts 17. The lower portion of the bracket 18 is connected to the wheel house. The damper base 41 is connected and fixed by a bolt 20 via a reinforcing plate 19.
[0018]
And in this embodiment, it has a pair of electrical storage apparatuses 23 for supplying electric power to the driving motor.
[0019]
As shown in FIG. 4, each power storage device 23 includes a battery pack (power storage device main body) 52 in which a plurality of unit cells 51 each made of a power storage element such as a capacitor, which are single-sided and double-sided, are connected by a bus bar (not shown). A bus bar plate (support plate) 30 made of an insulating material such as a soft resin that supports the assembled battery 52 on the both-side electrode extraction side, and an exterior box 29 attached to the bus bar plate 30 so as to cover the assembled battery 52 And a control unit 53 that is disposed on the opposite side of the battery pack 52 of the bus bar plate 30 and controls charging / power feeding and the like of the battery pack 52. Here, the bus bar plate 30 and the exterior box 29 constitute a case 22 that houses and protects the assembled battery 52. As shown in FIG. 5, in the unit cell 51, the screw member 72 inserted from the front side into the front plate 71 is screwed into the mounting hole 70 formed in the bus bar plate 30 from the rear side. By being combined, the bus bar plate 30 is fixed.
[0020]
As shown in FIG. 4, each power storage device 23 is attached to the vehicle body side with the bus bar plate 30 on the front side and the assembled battery 52 and the exterior box 29 on the rear side. At this time, in each power storage device 23, as shown in FIG. 4, the upper mounting portions 24 provided in the right and left direction as shown in FIG. It is fixed to the rear surface of the upper rear pillar cross member 14 with bolts 25. Further, as shown in FIG. 2, each power storage device 23 includes a plurality of lower mounting portions 27 provided in the left and right direction at the lower end portion of each bus bar plate 30. 4 is fixed to the mounting seat 26 shown in FIG. Here, in this state, the pair of power storage devices 23 are juxtaposed in the vehicle width direction with the upper portion being slightly rearward and standing obliquely. As a result, the power storage device 23 is located on the back side of the rear seat 6 and is not visible from the front side.
[0021]
Each upper mounting portion 24 is composed of a pair of front and rear mounting portions 24a and 24b whose mounting sides to the rear pillar cross member 14 overlap each other. These mounting portions 24a and 24b are fastened and fastened to the bus bar plate 30 with bolts 13 with the upper end portion of the bus bar plate 30 being sandwiched from both the front and rear sides. At this time, the mounting portion 24 a contacts the front surface of the bus bar plate 30, and the mounting portion 24 b contacts the rear surface of the bus bar plate 30. As shown in FIG. 2, a plurality of mounting portions 24 a in the left-right direction provided on the same bus bar plate 30, specifically, two mounting portions 24 a are formed integrally with one mounting bracket 54, and are shown in FIG. 3. As described above, a plurality of mounting portions 24 b in the left-right direction provided on the same bus bar plate 30, specifically, two mounting portions 24 b are integrally formed on one mounting bracket 55.
[0022]
As shown in FIG. 4, each lower mounting portion 27 is similarly configured by a pair of front and rear mounting portions 27 a and 27 b that overlap each other on the mounting side to the floor cross member 10. These mounting portions 27a and 27b are fastened and fastened to the bus bar plate 30 with bolts 13 in a state where the lower end portion of the bus bar plate 30 is sandwiched from both front and rear sides. At this time, the mounting portion 27 a contacts the front surface of the bus bar plate 30, and the mounting portion 27 b contacts the rear surface of the bus bar plate 30. Also on the lower side, as shown in FIG. 2, a plurality of mounting portions 27 a in the left-right direction that are attached to the same bus bar plate 30, specifically, two mounting portions 27 a are integrally formed with one mounting bracket 56. Although not shown in the drawing, a plurality of mounting portions 27b in the left and right direction, specifically, two mounting portions 27b that are mounted on the same bus bar plate 30 are also integrally formed with one mounting bracket 57.
[0023]
As shown in FIG. 2, each control unit 53 provided on the front surface of each bus bar plate 30 has an exterior box (unit box) 60 for protecting built-in components (not shown) composed of electrical components. The box 60 is integrally formed with a plurality of mounting portions 61 and two mounting portions 62 in the left-right direction in the upper and lower directions. Here, the exterior box 60 is a rigid structure made of aluminum or the like.
[0024]
Of the mounting brackets 54 to 57, the upper and lower mounting brackets 54, 56 disposed on the opposite side, that is, the front side of the assembled battery 52 of the bus bar plate 30 are connected via the exterior box 60 of the control unit 53. .
[0025]
That is, the front and upper mounting bracket 54 attached to one bus bar plate 30 extends further downward than the fastening position of the bolt 13 as shown in FIG. 4, and this extension tip side is shown in FIG. A plurality of specifically two mounting portions 61 on the upper side of the exterior box 60 attached to the same bus bar plate 30 are connected to the plurality of specifically mounting portions 64 by bolts 65. Further, the front and lower mounting brackets 56 attached to the same bus bar plate 30 extend further upward than the fastening position of the bolt 13 as shown in FIG. 4, and a plurality of the mounting brackets 56 shown in FIG. Specifically, a plurality of attachment portions 62 on the lower side of the exterior box 60 attached to the same bus bar plate 30 are connected to two attachment portions 67 by bolts 68.
[0026]
The front and upper mounting brackets 54 and 56 attached to the other bus bar plate 30 and the front and lower mounting brackets 56 are similarly connected to the exterior box 60 attached to the same bus bar plate 30.
[0027]
As shown in FIG. 3, an intake duct 33 for cooling air communicating with the inside of the case 22 is provided above each power storage device 23, that is, above each case 22. On the other hand, an exhaust duct 32 communicating with the inside of the case 22 is provided below each power storage device 23, that is, below each case 22. Furthermore, a duct cover 50 is provided at the upper part of both power storage devices 23, that is, at the upper part of both cases 22 so as to cover the left and right intake ducts 33.
[0028]
Each exhaust duct 32 extends toward the rear of the vehicle body on the rear floor 1 while being inclined to the side away from each other, and an exhaust port 35 that opens into the vehicle interior opens upward at the extended tip side. . A suction fan (not shown) is provided inside each exhaust port 35. The exhaust duct 32 is fixed to the rear floor 1 by fixing the bracket 36 provided in the exhaust duct 32 to the bracket 37 provided on the rear floor 1. When the suction fan is driven, the air in the exhaust duct 32, the case 22 and the intake duct 33 is sucked out and exhausted from the exhaust port 35 of the exhaust duct 32 into the vehicle interior. The assembled battery 52 inside is cooled.
[0029]
According to the vehicle body mounting structure of the power storage device of the present embodiment described above, the mounting brackets 54 and 55 that support the upper portion of the bus bar plate 30 sandwich the bus bar plate 30 in pairs as shown in FIG. The structure is fixed to the upper rear pillar cross member 14 and the mounting brackets 56 and 57 for supporting the lower portion of the bus bar plate 30 sandwich the bus bar plate 30 with these pairs. Since it is fixed to the cross member 10, the force applied at the time of a vehicle collision can be received without using high-strength materials or thick plates as the mounting brackets 54 to 57. In addition, since the upper and lower mounting brackets 54 and 56 on the opposite side to the assembled battery 52 of the bus bar plate 30 are connected via the exterior box 60 made of a rigid body of the control unit 53, these connected upper and lower mounting brackets. The bus bar plate 30 is reinforced by the 54 and 56 and the exterior box 60. As a result, even if a high-strength material or a thick plate is not used as the bus bar plate 30, the force applied at the time of the vehicle collision can be received. it can. Therefore, an increase in cost can be suppressed and weight reduction can be achieved. In addition, since it is not necessary to surround the power storage device 23 with a rigid body, space efficiency can be improved. Note that the impact can be absorbed by bending the mounting brackets 54 to 57 at the time of a vehicle collision.
[0030]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the mounting bracket that supports the upper portion of the support plate has a structure that sandwiches the support plate in a pair and is fixed to the upper cross member. Since the mounting bracket that supports the lower part of the support plate is a structure that sandwiches the support plate in a pair and is fixed to the lower cross member, a high-strength material or thick plate is not used as the mounting bracket However, the force applied at the time of a vehicle collision can be received. In addition, since the upper and lower mounting brackets on the opposite side to the power storage device body of the support plate are connected via the unit box, the support plate is reinforced by the connected upper and lower mounting brackets and the unit box. As a result, the force applied at the time of the vehicle collision can be received without using a high-strength material or a thick plate as the support plate. Therefore, an increase in cost can be suppressed and weight reduction can be achieved. In addition, since it is not necessary to surround the power storage device body with a rigid body, space efficiency can be improved. In addition, when the vehicle body collides, the mounting bracket bends so that the impact can be absorbed.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a vehicle body mounting structure of a power storage device according to an embodiment of the present invention.
FIG. 2 is a front perspective view showing a vehicle body mounting structure for a power storage device according to an embodiment of the present invention.
FIG. 3 is a rear perspective view showing a vehicle body mounting structure for a power storage device according to an embodiment of the present invention.
FIG. 4 is a side sectional view showing a main part of a vehicle body mounting structure for a power storage device according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a state in which a unit cell is attached to a bus bar plate in a vehicle body attachment structure of a power storage device according to an embodiment of the present invention.
[Explanation of symbols]
10 Floor cross member (cross member)
14 Rear pillar cross member (cross member)
23 Power storage device 30 Bus bar plate (support plate)
52 Battery pack (Power storage device body)
54 to 57 Mounting bracket 60 Exterior box (unit box)

Claims (1)

The upper and lower support plates that support the power storage device main body are held in contact with each other with a pair of mounting brackets apart from the front and rear sides , and the upper pair of mounting brackets are attached to the upper cross member . mounting portion is integrally formed, the support plate while fixed to each other overlap with the pair of mounting portions of the upper from the clamping state, to install them into the cross members of the lower to the pair of mounting brackets of the lower bottom A pair of mounting portions on the side are integrally formed, and are fixed so as to overlap each other at the pair of mounting portions on the lower side from the state of sandwiching the support plate , and further, the opposite side of the power storage device body of the support plate A vehicle body mounting structure for a power storage device, wherein upper and lower mounting brackets are connected via a unit box.

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