JP6308023B2 - Vehicle battery mounting structure - Google Patents

Description

  The present invention relates to a battery mounting structure for a vehicle that can reduce damage to a battery accompanying deformation of the frame structure even when the frame structure is deformed due to an accident or the like.

  An electric vehicle or a hybrid vehicle equipped with a gasoline drive mechanism and an electric motor is equipped with a battery for storing electric power for traveling. In many cases, a battery for traveling is stored in a battery case and fixed to a frame structure of a vehicle by attaching bolts or the like. The battery is thin and wide in the front, rear, left, and right directions so that the minimum ground clearance of the vehicle is not lowered and sufficient capacity is obtained.

  On the other hand, in the frame structure of the vehicle, when the accident occurs, the frame structure is deformed into a predetermined shape to absorb the collision energy, and at the same time, the vehicle body space is secured and the passenger is protected to promote the deformation. Is provided.

JP 2009-83597 A

  If the battery is attached to the frame structure behind the deformation promoting part across the deformation promoting part, the battery may be deformed and damaged together with the frame structure when the frame structural body is deformed by the deformation promoting part.

  An object of the present invention is to provide a battery mounting structure for a vehicle that can reduce the damage of the battery even when the frame structure is deformed by the deformation promoting portion due to an accident or the like.

  In order to solve the above-described problems, the present invention has a vehicle battery mounting structure configured as follows. The vehicle battery mounting structure includes a vehicle running battery and a connecting member that couples the running battery to a frame structure that forms a skeleton member of the vehicle. The frame structure includes a side member extending in the front-rear direction of the vehicle and a cross member extending in the vehicle width direction, and the side member is set to have a rigidity against deformation lower than that of other parts of the side member. A deformation promoting portion.

  The battery for traveling is provided across the deformation promoting portion in the side view of the vehicle, and one end of the connecting member is a first attachment portion of the frame structure located in front of the deformation promoting portion. The other end of the connecting member is attached to a second attachment portion of the traveling battery located behind the deformation promoting portion and below the first attachment portion.

  According to the present invention, damage to the battery can be reduced even when the frame structure is deformed by the deformation promoting portion due to the occurrence of an accident or the like.

1 is a partially transparent perspective view showing a vehicle including a battery mounting structure according to an embodiment of the present invention. The perspective view which shows the frame structure provided with the battery attachment structure, and a battery unit. The side view which shows the same frame structure and a battery unit. The perspective view which shows the frame structure and a battery unit. The side view which shows the connection member of the frame structure and a battery unit. The side view which shows the same frame structure and a battery unit. The perspective view which shows the frame structure and battery unit of other embodiment. The side view which shows the frame structure and battery unit of other embodiment.

<First embodiment>
A battery mounting structure for a vehicle according to a first embodiment of the present invention will be described. FIG. 1 is a perspective view of a vehicle 10 having the battery mounting structure of the first embodiment, showing the outer shape of the vehicle 10 with phantom lines. FIG. 2 is a perspective view showing the frame structure 20 and the battery unit 22 obliquely from above. FIG. 3 is a side view showing the frame structure 20 and the battery unit 22 from the side.

  FIG. 4 is a perspective view showing the frame structure 20 and the battery unit 22 from the obliquely lower rear side. FIG. 5 is a side view showing a connecting member 66 that connects the frame structure 20 and the battery unit 22. FIG. 6 is a side view showing the state in which the side member 24 is bent at the deformation promoting portion H from the side.

  As shown in FIG. 1, the vehicle 10 includes a frame structure 20 below, and includes a floor panel 11, left and right side doors 12, a windshield 13, a ceiling panel 14, and a rear door 15 on the upper surface of the frame structure 20. It is a box-type passenger car.

  A front wheel 16 is provided in front of the vehicle 10, and a rear wheel 17 and a driving electric motor are provided in the rear, respectively. Further, the vehicle 10 includes a battery unit 22 below the frame structure 20.

  A vehicle interior space 30 of the vehicle 10 is formed in the upper portion of the frame structure 20 by a floor panel 11, left and right side doors 12, a windshield 13, a ceiling panel 14, a rear door 15, and the like. Inside the passenger compartment 30 are seats for a capacity and equipment necessary for driving operation. Note that the configuration of the vehicle is not limited to this.

  The electric motor is provided behind the vehicle 10, and the drive shaft is connected to the rear wheel 17. As will be described later, the battery unit 22 includes a battery therein and is fixed to the frame structure 20. The electric motor is connected to the battery unit 22 via a control device (ECU (Electric Control Unit)), and drives the rear wheel 17 with electric power supplied from the battery unit 22 in accordance with the operation of the driver. Let it run.

  The electric motor may be provided on the front wheel 16 or on both the front wheel 16 and the rear wheel 17. Further, the vehicle 10 may be a so-called hybrid vehicle including an electric motor and an internal combustion engine using gasoline or the like as fuel.

  As shown in FIG. 2, the frame structure 20 includes a side member 24 that extends along the front-rear direction of the vehicle 10, and a cross member 26 that is provided to intersect the side member 24. A pair of side members 24 are provided on the left and right sides with an appropriate interval.

  The pair of side members 24 includes a first extending part 31, a second extending part 34, and an inclined part 32 extending obliquely. The 1st extension part 31 is the 1st extension part said by a claim, and the 2nd extension part 34 is the 2nd extension part.

  The first extending part 31 extends from the front of the vehicle 10 through the lower part of the passenger compartment space 30 to the rear part of the vehicle. The first extending portion 31 is connected to the inclined portion 32 at the rear end (first connecting portion 25). The inclined portion 32 extends obliquely upward toward the rear, and is connected to the second extending portion 34 at the rear end (second connection portion 27) of the inclined portion 32. In addition, the 1st connection part 25 is a 1st connection part said by a claim, and the 2nd connection part 27 is the 2nd connection part.

  The second extending portion 34 extends rearward from the rear end of the inclined portion 32, and a curved portion 28 is formed by the inclined portion 32 and the second extending portion 34 so as to avoid the rear wheel 17. A cross member 26 is provided between the left and right side members 24.

  As shown in FIG. 2, the cross member 26 includes a first cross member 26 a, a second cross member 26 b, and a third cross member 26 c from the front of the vehicle 10. The cross members 26a and the like are provided along the lateral width direction of the vehicle 10 and integrally connect the left and right side members 24.

  A front wheel 16 is provided in front of the frame structure 20 as shown in FIG. 1 via a front wheel suspension mechanism. The front wheels 16 are steered via a steering mechanism by a driver's steering operation.

  A rear wheel 17 is provided behind the frame structure 20 via a rear wheel suspension mechanism 40. The rear wheel suspension mechanism 40 includes an impact buffer 42, a spring 44, and a trailing arm 46. The trailing arm 46 is rotatably attached to a fixture 48 provided on the side member 24 at the tip end. The left and right trailing arms 46 are connected at the rear part of the trailing arm 46.

  The rear wheel 17 is attached to the rear end of the trailing arm 46 via a hub 53. The shock absorber 42 and the spring 44 are provided between the trailing arm 46 and the frame structure 20 or the floor panel 11. The rear wheel suspension mechanism of the rear wheel 17 is not limited to the above example.

  Furthermore, as shown in FIGS. 2 and 3, the side member 24 is provided with a deformation promoting portion H at a second connection portion 27 that is an intersection of the inclined portion 32 and the second extending portion 34. The deformation promoting portion H is formed by denting the surface of the side member 24, so that the rigidity of the deformation promoting portion H with respect to the deformation of the side member 24 is any position of the side member 24 other than the deformation promoting portion H. It is set so as to be smaller than the rigidity.

  For example, when the vehicle 10 is collided with another vehicle from the rear, the deformation promoting unit H operates as follows. When another vehicle collides with the vehicle 10, the pressing force applied to the side member 24 gradually increases. In the side member 24, since the rigidity at the deformation promoting portion H is lower than the rigidity at any position of the side member 24, the limit on the pressing force reaches the earliest in the deformation promoting portion H. When the pressing force further increases beyond the limit value of the deformation promoting portion H, the side member 24 is deformed by the deformation promoting portion H. FIG. 6 shows a state where the side member 24 is deformed. As shown in FIG. 6, in the side member 24, a portion behind the deformation promoting portion H (hereinafter referred to as “variable portion F”) bends with the deformation promoting portion H as a bending point.

  The deformation promoting portion H is provided behind the rear seat of the vehicle 10, that is, behind the rear end of the passenger compartment space 30. As a result, even if an accident or the like occurs in the vehicle 10 and the side member 24 bends at the deformation promoting portion H, the passenger compartment 30 is secured for the passenger.

  The first cross member 26a, the second cross member 26b, and the third cross member 26c described above are all connected to the side member 24 at a position in front of the deformation promoting portion H. The position in front of the deformation promoting portion H means, for example, a plane along the lateral width direction of the vehicle 10 including a vertical line passing through the deformation promoting portion H in a state where the vehicle 10 is placed horizontally. Is used as a reference plane.

  The deformation promoting portion H is not limited to the above example, and may be provided at another position of the side member 24 or may be provided at a place other than the side member 24. Further, the deformation promoting portion H is not only provided with a recess in the side member 24, but the width of the side member 24 is partially narrowed, a hole is provided in the side member 24, or a shape in which stress is concentrated, etc. It may be formed by a method. A battery unit 22 is attached to the lower part of the frame structure 20 so as to straddle the deformation promoting portion H.

  As shown in FIG. 3, the battery unit 22 includes a battery 50 and a battery case 52 that houses the battery 50 therein. The battery 50 is a collection of a predetermined number of single batteries (with an output voltage of about 1 to several volts), and stores electric power for driving the vehicle 10 by driving the electric motor. The battery case 52 includes a storage tray 54 and a cover 56 that covers the storage tray 54. The storage tray 54 is a metal container having an open top surface, and has a capacity for storing the battery 50 and sufficient rigidity to hold the stored battery 50. The cover 56 is made of, for example, resin, and includes an assembly portion for assembling the blower, an outside air inlet, and an outlet. The cover 56 is watertightly attached to the upper part of the storage tray 54 that stores the batteries 50.

  In addition, when referring to a battery, there are both a case where it indicates a single battery and a case where it indicates a battery 50 in which a predetermined number of single batteries are gathered, and further includes a case where it indicates a battery unit 22. Therefore, the case where the battery is damaged includes not only the case where the single battery is damaged, but also the case where the battery unit 22 including the battery case 52 is damaged.

  Five girder members 60 are provided in the lower part of the battery unit 22. The girder member 60 includes a first girder member 60a, a second girder member 60b, a third girder member 60c, a fourth girder member 60d, and a fifth girder member 60e in order from the front of the battery unit 22, and in the lateral width direction of the vehicle 10 Are provided substantially parallel to each other.

  Each girder member 60 is a metal plate-like member, has sufficient rigidity to support the battery unit 22, and is fixed to the lower surface of the storage tray 54 as shown in FIG. 4. Further, in the girder member 60, both end portions of the girder member 60 protrude from the left and right side walls of the storage tray 54, and the protruding portions are formed as attachment pieces 62 of the battery unit 22.

  Each mounting piece 62 is formed with a bolt hole, and the first mounting piece 62a to the fourth mounting piece 62d of the first girder member 60a to the fourth girder member 60d are bolt holes as shown in FIG. It is fixed to the lower surface of the first extending portion 31 of the side member 24 with a threaded bolt. The first mounting piece 62a to the fourth mounting piece 62d are all attached to a portion (hereinafter, referred to as “fixed portion G”) positioned in front of the deformation promoting portion H of the side member 24. The fixed portion G is a portion that is less affected by deformation even when the side member 24 is deformed by the deformation promoting portion H.

  The fifth attachment piece 62e of the fifth girder member 60e is located behind the position of the deformation promoting portion H in a side view of the vehicle 10. As shown in FIG. 5, a connecting member 66 is attached to the fifth attachment piece 62e of the fifth girder member 60e.

  The connecting member 66 is a metal plate member having a predetermined strength. One end of the connecting member 66 in the front-rear direction of the vehicle 10, that is, the front end 66b is fixed to the rear side wall of the third cross member 26c with a screw. As described above, the third cross member 26c is connected to a position in front of the deformation promoting portion H of the left and right side members 24, that is, the fixed portion G, as described above. Here, the first attachment portion referred to in the claims corresponds to the rear side wall of the third cross member 26c to which the front end portion 66b is attached. Further, the first attachment portion is located behind the first connection portion 25.

  Further, the connecting member 66 has a rear end portion 66a which is the other end attached to a fifth attachment piece 62e which is a second attachment portion. The fifth attachment piece 62e, which is the second attachment portion, is located behind the deformation promoting portion H, that is, the second connection portion 27, and below the attachment portion of the third cross member 26c, which is the first attachment portion. positioned. The rear end portion 66a and the fifth attachment piece 62e are fastened with bolts. The connecting member 66 extends obliquely upward and forward from the rear end portion 66 a, and a line connecting the rear end portion 66 a and the front end portion 66 b is set in parallel with the front-rear direction of the vehicle 10.

  Thus, in the battery unit 22, the first mounting piece 62 a to the fourth mounting piece 62 d are fixed to the fixing portion G of the side member 24, and the fifth mounting piece 62 e is connected to the third cross member via the connecting member 66. 26c, and thus attached to the frame structure 20.

  Next, the operation and effect of the vehicle 10 provided with the battery mounting structure of the present embodiment will be described. As described above, the battery unit 22 fixes the four girder members 60 of the first girder member 60a to the fourth girder member 60d to the side member 24 and the fifth cross member 60e via the connecting member 66 to the third cross. It is fixedly attached to the member 26c.

  Thereby, the battery unit 22 is securely attached to the frame structure 20 of the vehicle 10. Since the battery unit 22 is thin and widely formed in the front, rear, left, and right, the vehicle 10 has a minimum ground clearance and a sufficient battery capacity for traveling.

  Since the battery unit 22 is attached to the frame structure 20 with bolts, the battery unit 22 is removed from the frame structure 20 and repaired, including the removal of the connecting member 66 in the event of a failure in the battery unit 22. Alternatively, the battery unit 22 can be replaced with, for example, another battery unit. In addition, since the connecting member 66 is provided along the front-rear direction of the vehicle 10, the rear portion of the battery unit 22 can be reliably held against a force along the front-rear direction such as acceleration or deceleration of the vehicle 10. .

  Furthermore, it is assumed that the vehicle 10 is bumped back by another vehicle and the side member 24 is bent at the deformation promoting portion H. Then, as shown in FIG. 6, in the side member 24, the variable portion F of the side member 24 bends upward with the deformation promoting portion H as a bending point. On the other hand, even when the side member 24 is bent at the deformation promoting portion H, the fixing portion G of the side member 24 positioned in front of the deformation promoting portion H is not greatly deformed. Further, since the third cross member 26c is also attached to the fixed portion G of the side member 24, it is hardly affected by the bending of the variable portion F.

  Therefore, in the battery unit 22, even if the side member 24 is bent at the deformation promoting portion H due to the rear collision, the first girder member 60a to the fourth girder member 60d of the battery unit 22 are all of the side member 24. Since the fifth girder member 60e is fixed to the third cross member 26c via the connecting member 66, it is almost affected by the deformation of the side member 24. Absent.

  Therefore, even if the vehicle 10 is rearwardly bumped and the side member 24 is deformed by the deformation promoting portion H, basically, any of the first girder members 60a to 60e of the battery unit 22 is almost the same. Do not move. Therefore, even when the frame structure 20 is bent at the deformation promoting portion H due to an accident, the vehicle 10 is hardly affected by the battery unit 22 and can prevent the battery 50 housed in the battery case 52 from being damaged. . Even when the side member 24 is deformed in either the left or right direction, since the connecting member 66 is provided along the front-rear direction of the vehicle 10, the influence on the battery unit 22 can be reduced.

  Moreover, since the side member 24 bends in the deformation | transformation acceleration | stimulation part H at the time of the accident occurrence of the vehicle 10, while absorbing impact energy, the vehicle interior space 30 is ensured and the damage of the passenger | crew of the vehicle 10 can be reduced as much as possible.

<Second Embodiment>
Next, the battery mounting structure of 2nd Embodiment is demonstrated. FIG. 7 shows a battery mounting structure for a vehicle according to the second embodiment. FIG. 7 is a perspective view showing the frame structure 20 and the battery unit 22 from the obliquely lower rear side. In addition, about the battery attachment structure of the vehicle of 2nd Embodiment, the same code | symbol is attached | subjected about the member same as the battery attachment structure of the vehicle of 1st Embodiment, and description is abbreviate | omitted.

  On the lower surface of the battery unit 22, a first girder member 60a to a fifth girder member 60e are provided in order from the front. The fifth girder member 60e provided at the rearmost side of the battery unit 22 is disposed behind the deformation promoting portion H.

  Each of the first girder member 60a to the fourth girder member 60d is fixed to the fixing portion G in front of the deformation promoting portion H of the side member 24 with a bolt, as in the first embodiment. A rear end portion 67a of the connecting member 67 is fixed to the fifth attachment piece 62e of the fifth girder member 60e.

  The connecting member 67 extends forward from a rear end portion 67a fixed to the fifth mounting piece 62e, and the front end portion 67b is attached to the side surface of the inclined portion 32 of the side member 24 by a bolt. The front end portion 67b is fixed to the front side of the deformation promoting portion H of the side member 24, that is, the fixed portion G.

  According to the battery mounting structure of the second embodiment, since the front end portion 67b of the connecting member 67 is fixed to the fixing portion G of the side member 24, even when the side member 24 is bent by the deformation promoting portion H, the battery unit. 22 is not affected by deformation and can prevent damage to the battery 50 as much as possible. Furthermore, since the connecting member 67 is provided obliquely with respect to the front-rear direction of the vehicle, the battery unit 22 can be securely held, and can cope with vibrations that sway in the lateral width direction of the vehicle 10. .

  FIG. 8 shows another example of the deformation promoting portion H. The deformation promoting portion H is provided to face the inclined portion 32 of the side member 24. According to this example, for example, when a rear-end collision occurs, the inclined portion 32, that is, the side member 24 is deformed at the position of the deformation promoting portion H shown in FIG. As described above, the deformation promoting portion H is not limited to the above-described position of the frame structure 20, and may be provided at any position other than the second connection portion 27 and further other than the inclined portion 32.

  In addition, all the said embodiment is an illustration and can be changed suitably. For example, in the first and second embodiments, the connecting member 66 and the like are attached to the fifth girder member 60e of the battery unit 22 and connected to the fixed portion G of the frame structure 20, but the plurality of girder members 60 promote deformation. In the case of being behind the portion H, each girder member 60 behind the deformation promoting portion H is connected to the frame structure 20 ahead of the deformation promoting portion H directly or using a connecting member or the like.

  Further, the shape in which the frame structure 20 is deformed with the deformation promoting portion H as a bending point is not limited to the shape described above, and may be another shape. Further, the deformation promoting part H may be provided at an arbitrary position corresponding to each vehicle. Furthermore, when a plurality of deformation promoting portions having different limit stiffness values are provided in the frame structure, the battery unit and the frame structure may be connected according to the set position of the deformation promoting portion.

  Furthermore, a rigid weakening portion may be provided in the connecting member 66 or the like, or the rigidity of the fixing portion that fixes the connecting member 66 or the like and the frame structure 20 may be weakened. As a result, when a stress greater than an allowable value is applied to the battery unit 22 due to the deformation of the frame structure 20, the weakened portion or the like provided in the connecting member 66 breaks, and the frame structure 20, the battery unit 22, and the like. May be released so that the deformation of the frame structure 20 does not affect the battery unit 22.

  The present invention can be used for a vehicle in which a battery for traveling is mounted on a frame.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Floor panel, 12 ... Side door, 13 ... Windshield, 14 ... Ceiling panel, 15 ... Rear door, 16 ... Front wheel, 17 ... Rear wheel, 20 ... Frame structure, 22 ... Battery unit, 24 ... Side 25, 1st connection part, 26 ... Cross member, 26c ... 3rd cross member, 27 ... 2nd connection part, 28 ... Curve part, 30 ... Car interior space, 31 ... 1st extension part, 32 ... Inclination 34, second extending portion, 40 ... rear wheel suspension mechanism, 42 ... shock absorber, 46 ... trailing arm, 48 ... fitting, 50 ... battery, 52 ... battery case, 53 ... hub, 54 ... storage Tray, 56 ... cover, 60 ... girder member, 60e ... fifth girder member, 62 ... mounting piece, 62e ... fifth mounting piece, 66, 67 ... connecting member, 66a ... rear end, 66b ... front end, H ... Deformation promoting part, F ... variable part G ... fixed portion.

Claims (5)

A battery for running the vehicle;
A connecting member that connects the traveling battery to a frame structure that forms a skeleton member of the vehicle,
The frame structure includes a side member extending in the front-rear direction of the vehicle, and a cross member extending in the vehicle width direction,
The side member has a deformation promoting portion whose rigidity against deformation is set lower than the rigidity of other parts of the side member,
The traveling battery is provided across the deformation promoting portion in the side view of the vehicle,
One end of the connection member is attached to a first attachment portion of the frame structure located in front of the deformation promoting portion, and the other end of the connection member is behind the deformation promotion portion and the first attachment portion. It is attached to the 2nd attachment part of the said battery for driving | running | working located further downward. The battery attachment structure of the vehicle characterized by the above-mentioned. The side member includes a first extension part, a second extension part positioned rearward and above the first extension part, and a first end serving as a rear end of the first extension part. And an inclined portion that is connected to the second connecting portion that is connected to the connecting portion of the second extending portion and serves as a front end of the second extending portion,
The deformation promoting part is formed in the second connection part or the inclined part,
The first attachment part is located behind the first connection part and ahead of the deformation promoting part, and the second attachment part is located behind the second connection part. The battery mounting structure for a vehicle according to claim 1. The vehicle battery mounting structure according to claim 1 or 2, wherein the first mounting portion to which the one end of the connecting member is mounted is provided on the cross member. The battery for traveling has a girder member extending in the vehicle width direction on the lower surface,
4. The vehicle battery mounting structure according to claim 1, wherein the second mounting portion to which the other end of the connecting member is mounted is provided on the beam member. 5. The battery mounting structure for a vehicle according to any one of claims 1 to 4, wherein the deformation promoting portion is provided behind a rear end of a vehicle interior space of the vehicle.

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