JP2020082945A - Structure of vehicle with power storage device - Google Patents

Abstract

To provide a structure of a vehicle with a power storage device capable of improving protection performance of the power storage device against a side collision of the vehicle while properly preventing or suppressing rise in production cost and weight.SOLUTION: A structure A of a vehicle with a power storage device includes a cross member 4A at at least one of a vehicle front side neighborhood position of the power storage device 2 and a vehicle rear side neighborhood position. An area at an outer end of the cross member 4A in the vehicle width direction is a widening part Sa width of which is larger than that of a general area Sb at a center part in the vehicle width direction. The widening part Sa includes an inclined plane 41 width of which becomes larger from a boundary part P1 with the general area Sb to outside in the vehicle width direction. The boundary part P1 is constituted to be at the outside of the vehicle width direction compared with the power storage device 2. A side member 5 is arranged underneath the widening part Sa so that an inner end part 5a in the vehicle width direction is positioned under the inclined plane 41.SELECTED DRAWING: Figure 3

Description

The present invention relates to a structure of a vehicle equipped with a power storage device suitable for mounting a battery such as a lithium-ion secondary battery or other power storage devices in various vehicles such as hybrid vehicles and electric vehicles.

As a specific example of the structure of a vehicle equipped with a power storage device, there is one described in Patent Document 1.
In the structure described in the document, a battery as a power storage device is mounted on the floor below the vehicle rear seat. A cross member extending in the vehicle width direction is provided near the vehicle front side of the battery on the floor portion. On the other hand, a pair of left and right side members extending in the vehicle front-rear direction is provided in the vehicle width direction outer region, and the cross member is bridged between the pair of side members. It is set.
With such a configuration, the battery can be mounted on the vehicle space-efficiently by utilizing the space below the vehicle rear seat. In addition, since the cross member enhances the rigidity in the vicinity of the battery mounting area, when the vehicle suffers a side collision, the collision load is received by the cross member to suppress the shock received by the battery, It is also possible to obtain a damage suppressing action.

However, in the above-mentioned prior art, there is still room for improvement as described below.

In a vehicle equipped with a power storage device, it is required to have excellent battery protection performance in the event of a side collision of the vehicle. On the other hand, in the cross member according to the above-mentioned conventional technique, the outer end in the vehicle width direction is formed to have a smaller size than the central portion in the vehicle width direction, and is fixed to the side member. Therefore, when a side collision of the vehicle occurs, the outer end portion of the cross member in the vehicle width direction may be relatively easily compressed and deformed, and the vehicle side portion such as the side door may greatly enter the vehicle interior. .. As a type of side collision of a vehicle, there is a pole side collision in which a pole-shaped barrier and a vehicle side portion collide with each other. In this case, the vehicle side portion is more likely to enter the vehicle compartment, and the impact received by the battery is It gets even bigger.
As a means for preventing such a situation, it is conceivable to increase the wall thickness or increase the size of the cross member or the side member and increase the vehicle body rigidity in the peripheral portion of the battery. However, simply adopting such a means not only raises the manufacturing cost, but also causes problems such as an increase in weight.

JP, 2011-126439, A

The present invention has been devised under the circumstances as described above, and while appropriately preventing or suppressing problems such as an increase in manufacturing cost and an increase in weight, a power storage device for a side collision of a vehicle is provided. It is an object of the present invention to provide a structure of a vehicle equipped with a power storage device capable of improving the protection performance of the above.

In order to solve the above problems, the present invention takes the following technical means.

A structure of a vehicle equipped with a power storage device provided by the present invention includes a power storage device mounted on a floor portion of a vehicle, at least one of a position near a vehicle front side and a position near a vehicle rear side of the power storage device, and A power storage device including: a cross member extending in the vehicle width direction; and a side member provided below the floor portion so as to be positioned on the vehicle width direction outer side of the vehicle and extending in the vehicle front-rear direction. In the structure of the mounted vehicle, a region of the cross member near the outer end in the vehicle width direction is a widened portion having a width larger than a general region near the center of the cross member in the vehicle width direction. The boundary portion includes an inclined surface portion that inclines so that the width increases as it advances outward in the vehicle width direction from the boundary portion, and the boundary portion is located outward of the power storage device in the vehicle width direction. The side member is arranged below the widened portion such that an inner end portion of the side member in the vehicle width direction is located below the inclined surface portion.

With such a configuration, the following effects can be obtained.
First, it is possible to improve the protection performance of the power storage device against the side collision of the vehicle.
To be more specific, first, the region of the cross member closer to the outer end in the vehicle width direction is formed as a widened portion, and its rigidity is increased, and since it is provided so as to overlap the side member, a side collision of the vehicle occurs. In the initial stage of the side impact in the case of occurrence of a collision, even if the collision load is large, it can be effectively received by the widening portion, and the collision energy is appropriately absorbed by the compression deformation of the widening portion or the like. be able to. Further, since the widened portion of the cross member includes a predetermined inclined surface portion located on the outer side in the vehicle width direction with respect to the power storage device, and the inner end portion of the side member in the vehicle width direction is located below the inclined surface portion. In the middle and late stages of a side collision of a vehicle, the cross member can be accurately bent and deformed at a position on the vehicle width direction outer side than the power storage device. As a result, the collision energy can be more appropriately absorbed. As a result, even if the side collision of the vehicle is, for example, a pole side collision and a large collision load is input to the vehicle side portion, the vehicle side portion is prevented from largely entering the vehicle interior, and the power storage device is It is possible to appropriately prevent or suppress a large impact and improve the protection performance of the power storage device.
Secondly, according to the present invention, the widening portion is partially provided on the cross member, and the positional relationship between the widening portion and the side member is set to a predetermined state, whereby the power storage device protection performance in the event of a side collision of the vehicle is achieved. The cross member does not need to be thickened or increased in size over its entire length. Further, it is not necessary to additionally provide a dedicated member for increasing the rigidity of the peripheral portion of the power storage device. Therefore, it is possible to suppress an increase in manufacturing cost and appropriately reduce the weight of the vehicle.

Other features and advantages of the present invention will become more apparent from the following description of the embodiments of the invention with reference to the accompanying drawings.

FIG. 1 is a partially cutaway perspective view showing an example of the structure of a vehicle equipped with a power storage device according to the present invention. FIG. 2 is a sectional view of a main part of II-II in FIG. 1. FIG. 3 is a sectional view taken along the line III-III in FIG. 1. FIG. 4 is an operation explanatory view of the structure shown in FIG. 3. It is an important section sectional view showing other examples of the present invention. It is a partial fracture main part perspective view showing other examples of the present invention.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

A structure A of a vehicle equipped with a power storage device shown in FIGS. 1 and 2 includes a battery 2 (an example of the power storage device) mounted on a floor portion 1 of a vehicle interior of a vehicle V, a pedestal frame 3 for rear seat configuration, a front side and a rear side. It has side cross members 4A, 4B and a pair of left and right side members 5. In FIG. 1, reference numeral 18 indicates a side door, and reference numeral 19 indicates a rear wheel.
In the present embodiment, the cross member 4A is provided with the widened portion Sa described later.

The vehicle V to which the structure A of the present embodiment is applied is, for example, a hybrid vehicle or an electric vehicle. The battery 2 is a battery for driving the vehicle V, and is, for example, a lithium ion secondary battery or a nickel hydrogen secondary battery.

In FIG. 2, the floor part 1 is configured using a floor panel material. In the present embodiment, the step portion 10 is provided on the floor portion 1, the vehicle front side of the step portion 10 is the front floor panel portion 1a, and the vehicle rear side of the step portion 10 and the step portion 10 is the rear floor panel portion 1b. Is. The step portion 10 is a portion whose front portion is higher than the front floor panel portion 1a by an appropriate height, and basically, the height is gradually increased toward the vehicle rear side. It includes the inclined part. However, the step portion 10 is provided with a partially flattened portion, and the battery 2 is mounted at this portion.

The pedestal frame 3 is for constructing a bench-type rear seat, and the pedestal body portion 30 for mounting the seat cushion 8 and a seat back (not shown) includes a front support leg portion 31, a rear fixing portion 32, and the like. It is a structure that is fixedly supported by utilizing it. The pedestal body 30 is made of, for example, a round pipe material and is located above the battery 2. The lower portion of the front support leg portion 31 is connected to the front cross member 4A. A portion of the floor portion 1 where the rear fixing portion 32 is provided is reinforced by a rear cross member 4B. The rear cross member 4B is located near the vehicle rear side of the battery 2 and extends in the vehicle width direction.

The front cross member 4A is provided so as to be located near the vehicle front side of the battery 2 and extends in the vehicle width direction. In the present embodiment, the cross member 4A has a substantially L-shaped cross section having an upper wall portion 40a and an upright wall portion 40b, and is arranged above the floor portion 1 so as to reinforce the front end portion of the step portion 10 of the floor portion 1. And is joined to the floor portion 1. Further, the cross member 4A is set so as to form a bridge between the pair of left and right rockers 6 located at the lower portions of both side portions of the vehicle, and is joined to the pair of rockers 6. As shown in FIG. 3, the rocker 6 is composed of a rocker inner 6a whose upper and lower parts are joined to each other, a rocker outer 6b, and a rocker reinforcement 6c arranged inside thereof, and extends in the vehicle front-rear direction. There is.

In FIG. 3, an area near the outer end of the cross member 4A in the vehicle width direction is a widened portion Sa, and the vertical width La of the widened portion Sa is smaller than the vertical width Lb of the general area Sb near the center in the vehicle width direction. large. However, in the widened portion Sa, the vertical width La is not constant over the entire length region and includes the width changed portion Sa'. The width changing portion Sa′ is an inclined surface portion 41 in which the upper wall portion 40a is inclined so that the vertical width thereof increases as it goes from the boundary portion P1 between the general area Sb and the widening portion Sa to the outer side in the vehicle width direction. Is a part provided with. The boundary portion P1 is a rigid breaking point that becomes a starting point for bending and deforming the cross member 4A so that the widened portion Sa rotates upward when the cross member 4A receives a large load of a predetermined amount or more from the outside in the vehicle width direction. Equivalent to.

The pair of left and right side members 5 is, for example, a hat-shaped member in cross section, is provided on the lower side of the floor portion 1 so as to be positioned on both outer sides in the vehicle width direction of the vehicle V, and extends in the vehicle front-rear direction. There is. Each side member 5 is located below the widened portion Sa, and the inner end portion 5a in the vehicle width direction of each side member 5 is located below the inclined surface portion 41. A boundary portion of the floor portion 1 between a portion of the side member 5 to which the vehicle width direction inner end portion 5a is joined and an adjacent portion on the inner side in the vehicle width direction (a portion not joined to the side member 5). P2 is a portion that can function as a rigidity breaking point that is a starting point of bending deformation of the floor portion 1 when a large load is applied from the outer side in the vehicle width direction. The outer end portion side of the widened portion Sa is set so as to extend beyond the side member 5 to the outer side in the vehicle width direction.

Next, the operation of the structure A of the vehicle equipped with the power storage device will be described.

When a pole side collision occurs as one mode of the side collision of the vehicle V, first, in the initial stage of the collision, the collision load F is input from the pole-shaped barrier 90 as shown in FIG. A portion of the widened portion Sa of the cross member 4A near the outer end is compressed and deformed. The widened portion Sa of the cross member 4A has a vertical width La that is larger than the vertical width Lb of the general region Sb and has increased rigidity, so that it is possible to effectively receive a large collision load F at the initial stage of the collision. is there. Collision energy is absorbed by the above-described compressive deformation of the widened portion Sa and the rocker 6.

In the middle/latter period of the side collision of the pole of the vehicle V, the cross member 4A starts from a boundary P1 between the widened portion Sa and the general area Sb or a portion (boundary portion P2) outside the boundary P1 in the vehicle width direction. As indicated by the arrow Na in FIG. 4, the widened portion Sa is bent and deformed so as to rise. This is because, as described above, when there is a load input from the outside in the vehicle width direction, the boundary portion P1 becomes a rigid breakpoint in the cross member 4A, and the boundary portion P2 becomes in the floor portion 1. This is a rigid break point, and this boundary portion P2 is based on being located below the inclined surface portion 41 of the widened portion Sa. When the cross member 4A undergoes the bending deformation as described above, this further absorbs the collision energy.

As described above, according to this embodiment, the collision energy can be appropriately absorbed not only in the initial stage of the side collision of the pole but also in the middle/late stages, and the deformation of each part such as the cross member 4A and the floor part 1 can be prevented. The displacement can be performed in a region outside the battery 2 in the vehicle width direction. Therefore, it is possible to appropriately prevent or suppress the battery 2 from receiving a large impact, and the battery 2 can have excellent protection performance.

In the present embodiment, the widening portion Sa is partially provided on the cross member 4A, and the positional relationship between the widening portion Sa and the side member 5 is set to a predetermined state, whereby the protection performance of the battery 2 is improved. It is a thing. It is not necessary to thicken or increase the entire length of the cross member 4A, and it is not necessary to separately use a dedicated member for increasing the strength of the peripheral portion of the battery 2. Therefore, it is possible to appropriately suppress an increase in manufacturing cost of the vehicle V, an increase in weight, and the like.

5 and 6 show another embodiment of the present invention. In these figures, elements that are the same as or similar to those in the above-described embodiment are assigned the same reference numerals as those in the above-described embodiment, and redundant description is omitted.

In the embodiment shown in FIG. 5, a boundary portion P2 between the vehicle width direction inner end portion 5a of the side member 5 of the floor portion 1 and a portion adjacent thereto is defined by the general area Sb of the cross member 4A and the widened portion Sa. It is located just below the boundary P1.
As described above, since the boundary portions P1 and P2 both function as rigidity breaking points, according to the present embodiment, the boundary of the cross member 4A is defined in the middle/late period when a side collision of the vehicle V occurs. Accurate bending is further ensured at the position of the portion P1, that is, at a position outside the battery 2 in the vehicle width direction.

In the embodiment shown in FIG. 6, the front-rear width La′ of the widened portion Sa of the cross member 4A is made larger than the front-rear width Lb′ of the general region Sb, and the vertical width between the widened portion Sa and the general region Sb is It is almost the same. The inclined surface portion 41 is inclined in a plan view.
Even in this embodiment, as in the case of the previous embodiment, at the time of a side collision of the vehicle V, the action intended by the present invention can be obtained. As understood from the present embodiment and the previous embodiment, the width of the widened portion in the present invention is not limited to the vertical width and may be the front-back width or the like.

The present invention is not limited to the contents of the above-mentioned embodiment. The specific configuration of each part of the structure of the vehicle equipped with the power storage device according to the present invention can be variously changed in design within the scope intended by the present invention.

In the above-described embodiment, the front cross member 4A located near the vehicle front side of the battery 2 is provided with the widening portion Sa, but instead of or in addition to this, for example, the vehicle of the battery 2 is provided. The rear cross member 4B located in the vicinity of the rear side or another cross member provided separately from the rear cross member 4B may be provided with the widened portion. When a cross member having a widened portion is provided near the vehicle front side of the battery 2, this cross member may be provided at a position different from the cross member 4A described above.
The location where the battery is mounted is not limited to the lower region of the rear seat and is not limited.
The power storage device in the present invention includes not only a battery but also a capacitor and the like.
Preferably, the structure of the power storage device-equipped vehicle intended by the present invention is provided corresponding to both left and right sides of the vehicle, but the structure of the power storage device-equipped vehicle intended by the present invention is provided only on one side of the vehicle. Even if it exists, it is included in the technical scope of the present invention.

A Structure of vehicle equipped with power storage device P1 Boundary portion Sa Wide portion Sb General area V Vehicle 1 Floor portion 2 Battery (power storage device)
4A Cross member 5 Side member 5a Vehicle width direction inner end (of side member)

Claims (1)

A power storage device mounted on the floor of the vehicle,
A cross member that is provided in at least one of a vehicle front side vicinity position and a vehicle rear side vicinity position of this power storage device and extends in the vehicle width direction;
A side member that is provided on the lower side of the floor portion so as to be positioned on the vehicle width direction outer side of the vehicle and that extends in the vehicle front-rear direction;
A structure of a vehicle equipped with a power storage device, comprising:
The region of the cross member closer to the vehicle width direction outer end is a widened portion having a width larger than the general region of the cross member closer to the center of the vehicle width direction,
The widened portion includes an inclined surface portion that is inclined so that the width increases from the boundary portion with the general area toward the vehicle width direction outward side, and the boundary portion has a vehicle width larger than that of the power storage device. It is configured to be located on the outer side in the direction,
A structure of a vehicle equipped with a power storage device, wherein the side member is arranged below the widened portion such that an inner end portion in the vehicle width direction of the side member is located below the inclined surface portion.

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