JP2017132368A - Battery mount structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery mount structure for a vehicle, capable of appropriately preventing a risk for a battery mounted under a seat cushion part of a vehicle seat, to be damaged at an accident such as a front collision of the vehicle, while suppressing disadvantages such as increase in weight and a manufacturing cost.SOLUTION: A battery mount structure A comprises: a battery 3 mounted on a floor 2 so as to be arranged under a seat cushion part 50 of a vehicle seat 5. A rigidity break point 6 is provided in an area surrounding a battery mount area 20 of the floor 2, so that the floor 2 can be deformed to cause the battery mount area 20 to descend when a downward load of a predetermined amount or greater is applied from the vehicle seat 5 side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle battery mounting structure applied when a battery such as a lithium ion secondary battery is mounted on a vehicle such as a so-called hybrid vehicle or electric vehicle.

As a specific example of a vehicle battery mounting structure, there is a structure described in Patent Document 1.
In the structure described in this document, a space is formed under the seat cushion portion of the vehicle seat, and a battery is disposed on the space and mounted on the floor in the vehicle interior. According to such a configuration, the battery can be mounted on the vehicle in a space efficient manner by effectively using the lower space of the vehicle seat.

  However, the prior art still has room for improvement as described below.

That is, the battery needs to be protected from damage. When the battery is, for example, a lithium ion secondary battery, there is a possibility that heat generation, ignition, or explosion may occur due to damage.
On the other hand, in the prior art, since the battery is disposed under the seat cushion portion of the vehicle seat, when the seat cushion portion is deformed to be lowered due to a downward load, the seat cushion portion Or the member which supports this seat cushion part may hit a battery strongly, and there exists a possibility of giving an impact to a battery. For example, the following cases apply. That is, when a frontal collision of the vehicle occurs, there is a case in which a passenger seated on the rear seat assumes a forward leaning posture and the center of gravity of the passenger is rapidly displaced toward the front side of the vehicle. When such a phenomenon occurs, the load is concentrated on the front part of the seat cushion part. For example, the support part that supports the seat cushion part causes buckling deformation, and the seat cushion part is lowered forward. There is a possibility that the support portion or the seat cushion portion may strongly hit the upper portion of the battery. When the vehicle seat is a bench seat and a plurality of occupants are seated, the total weight of the occupants increases, so the above-described fear is more likely to occur, and the battery is more likely to be damaged.

  One means for eliminating such a concern is to increase the thickness of the support portion of the seat cushion portion so that the seat cushion portion is not easily deformed even when the seat cushion portion receives a considerably large load. Thus, means for increasing the rigidity can be considered. However, when such a means is adopted, there is a disadvantage in that the weight is increased and the manufacturing cost is increased.

JP2013-112210A

  The present invention has been conceived under the circumstances as described above, and a battery mounted under a seat cushion portion of a vehicle seat is suppressed while suppressing an increase in weight, an increase in manufacturing cost, and the like. An object of the present invention is to provide a battery mounting structure for a vehicle that can appropriately prevent the possibility of damage during a frontal collision of the vehicle.

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

  A vehicle battery mounting structure provided by the present invention is mounted on a vehicle seat mounted on a floor in a vehicle compartment and on the floor so as to be positioned under a seat cushion portion of the vehicle seat. A battery mounting structure for a vehicle, wherein when a downward load of a predetermined magnitude or more is input from the vehicle seat side to a position surrounding the battery mounting area of the floor, It is characterized in that a rigid breakpoint is provided that enables the floor to be deformed so that the battery mounting area is lowered.

According to such a configuration, the following effects can be obtained.
First, a large load is generated to cause the seat cushion portion to be deformed downwardly due to, for example, an abrupt movement of the center of gravity of the occupant at the time of a frontal collision of the vehicle or other reasons, and this load is generated on the floor in the passenger compartment. If the load is greater than or equal to a predetermined value, the battery mounting area on the floor is lowered. As described above, when the battery mounting area is lowered and the battery is sunk downward, even if the seat cushion part is deformed to be in a front lowering state, the seat cushion part or a member that supports the seat cushion part is not provided. Strong collision with the battery is appropriately prevented or suppressed. As a result, it is possible to suitably prevent damage to the battery.
Secondly, as a means for obtaining the above-described effect, a rigid break point is provided on the floor in the passenger compartment. Such a rigid break point is relatively easy when, for example, pressing the floor. It is possible to form, and productivity is good. Further, the rigidity break point does not cause a significant increase in weight. On the other hand, according to the present invention, it is necessary to increase the rigidity of the seat cushion portion by, for example, considerably increasing the thickness of the support portion of the seat cushion portion so that the seat cushion portion is not easily deformed when subjected to a large downward load. Can be eliminated or reduced. Accordingly, it is possible to suitably reduce the overall weight and the manufacturing cost.

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

(A) is a partially omitted principal part perspective view which shows an example of the battery mounting structure of the vehicle which concerns on this invention, (b) is II sectional drawing of (a). It is principal part sectional drawing explaining the effect | action of the structure shown in FIG. (A), (b) is principal part sectional drawing which shows the other example of a rigid break point.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
In the drawing, an arrow Fr indicates the front of the vehicle, an arrow W indicates the vehicle width direction, and an arrow Up indicates the upper side in the vehicle height direction.

  A vehicle battery mounting structure A shown in FIG. 1 includes a vehicle seat 5 having a battery 3 mounted on a floor 2 in a passenger compartment 1, a seat placing table 4, a seat cushion portion 50, and a seat back portion 51 (see FIG. 1). (Omitted in (a)) and a rigid break point 6 provided on the floor 2. The vehicle seat 5 is, for example, a bench-type rear seat. In addition, the code | symbol 90 of Fig.1 (a) has shown the door opening part opened and closed by a side door (not shown).

The seat mounting table 4 is a table for mounting and supporting the seat cushion portion 50 of the vehicle seat 5. The seat mounting table 4 is formed by, for example, welding a plurality of pipe members, and has an upper frame portion 40, a front of the upper frame portion 40. And a plurality of support leg portions 41 that hang downward from the section, and a front lower portion 42 that connects lower portions of the plurality of support leg portions 41. The floor 2 is divided into first and second floor portions 2a and 2b connected to the front and rear via an upright wall portion 2c that generates a level difference, and the front lower portion 42 and the upper frame portion 40 of the sheet placing table 4 are separated. The rear portion is fixed to the first and second floor portions 2a and 2b by means such as bolting. The upper frame portion 40 has a substantially horizontal frame shape, and the seat cushion portion 50 is placed and fixed on this portion.

  The seat mounting table 4 is formed so that a side sectional view is substantially L-shaped, and a space S is formed below the seat cushion portion 50 (strictly below the upper frame portion 40). Yes. The battery 3 is disposed in the space S and is fixed to the first floor 2a by means such as bolting. The vehicle to which the battery mounting structure A of the present embodiment is applied is a so-called hybrid vehicle or electric vehicle, and the battery 3 is, for example, a lithium ion secondary battery. Although not shown in the drawings, a cover member is appropriately provided to conceal the battery 3 and protect it so that the battery 3 is not exposed in front of or on the side of the space S. The seat cushion portion 50 can be used as the cover member.

  As will be described later, the rigid break point 6 of the floor 2 is deformed so as to lower the battery mounting area 20 of the floor 2 when a downward load of a predetermined size or more is input to the first floor portion 2a. It is a part of. Here, the “predetermined size” is a value smaller than a downward load that causes the support leg portion 41 of the sheet mounting table 4 to buckle and deform (battery mounted before the support leg portion 41 is greatly buckled and deformed). The area 20 needs to be lowered). The rigidity break point 6 is a portion whose rigidity is relatively lower than other general portions of the first floor portion 2a. In the present embodiment, the rigidity break point 6 has a substantially semicircular arc shape or a substantially U shape in a sectional view. It is a concave bead that is formed in a concave shape on the upper surface and protrudes downward, and has a smaller thickness than other general portions. Further, the rigid break point 6 is provided at a position surrounding the battery mounting region 20, and is substantially U-shaped in a plan view in which the first rigid break point 6a and the pair of second rigid break points 6b are connected. It is said that. The first rigid break point 6a is located in front of the vehicle 3 with respect to the battery 3 and the front lower portion 42 of the seat mounting table 4 and has a straight line shape in plan view extending in the vehicle width direction. The pair of second rigid break points 6b are linear in plan view extending from both longitudinal ends of the first rigid break point 6a to the vehicle rear side, and the vehicle width direction of the front lower portion 42 of the battery 3 and the seat mounting table 4 Located on both sides.

  Next, the operation of the above-described vehicle battery mounting structure A will be described.

  First, in a state where an occupant is seated on the vehicle seat 5, for example, a frontal collision of the vehicle occurs, and the occupant leans forward and the center of gravity of the occupant is rapidly displaced toward the front of the vehicle. As a result, a force may be generated that tends to deform the seat cushion portion 50 in a front-down manner. In such a case, if the downward load W acting on the floor 2 is greater than or equal to a predetermined value, the rigid break point 6 is deformed so as to extend downward or obliquely downward as shown in FIG. As a result, the area surrounded by the rigid break point 6 in the first floor portion 2a is lowered, and the battery mounting area 20 is lowered. In addition, the location which supports the front side lower part 42 of the sheet | seat mounting base 4 also falls among the 1st floor parts 2a.

  When the operation as described above is caused, unlike the case where the front portion of the sheet mounting table 4 is deformed and lowered while the battery 3 is fixed, the upper frame portion 40 of the sheet mounting table 4 strongly collides with the battery 3. Doing it is properly avoided. Therefore, it is possible to accurately prevent the battery 3 from being damaged. The rear portion of the upper frame portion 40 of the sheet placement table 4 is fixed to the second floor portion 2b, and the sheet placement table 4 is lowered so as to rotate around the fixed portion or its vicinity, and thus rigid. The lowering operation of the battery mounting region 20 based on the deformation of the break point 6 can be performed more smoothly.

  According to the present embodiment, the battery 3 is prevented from being damaged by simple means such as providing the rigid break point 6 on the floor 2. For this reason, productivity is good and manufacturing cost can be reduced. Further, there is almost no increase in weight, which is suitable for reducing the weight of the vehicle.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the vehicle battery mounting structure according to the present invention can be varied in design in various ways within the intended scope of the present invention.

  In the present invention, for example, as shown in FIG. 3 (a), when the rigid break point 6 is formed as a concave bead, there is a difference in height between two areas 2c and 2d on the floor 2 sandwiching the rigid break point 6. It can be set as the provided structure. Among the areas 2c and 2d, a battery is mounted on the area 2d side (the same applies to FIG. 3B described later). According to such a configuration, the substantial dimension of the rigid break point 6 can be lengthened, and when the region 2d of the floor 2 descends in response to the load Wa as shown by the phantom line in FIG. Can be increased.

The rigid break point 6 shown in FIG. 3 (b) is formed as an inclined standing wall that causes a height difference in the two regions 2c and 2d of the floor 2, and the bent portions 60a and 60b are fragile portions. ing. When a load Wa greater than a predetermined value is received, the bent portions 60a and 60b are deformed as indicated by phantom lines in the figure, and the region 2d can be appropriately lowered.
In addition to the above, the rigid break point in the present invention can be formed as a thin-walled portion forming region, a through-hole forming region, or the like. In short, it may be provided as a portion for deforming the floor so that the battery mounting area descends when a downward load of a predetermined size or more is input from the vehicle seat side. The rigid break point is provided at a position surrounding the battery mounting area on the floor, but it can be understood from the above-described embodiment that the rigidity break point may not be provided so as to surround the entire circumference of the battery mounting area.

  The vehicle seat is not limited to the bench type, and may be another seat such as a front seat instead of the rear seat. Furthermore, unlike the embodiment described above, the vehicle seat can be installed on a flat floor having no height difference. The specific type and size of the battery are not limited.

A Vehicle battery mounting structure 1 Car compartment 2 Floor 20 Battery mounting area (of floor)
3 Battery 4 Seat mounting table 5 Vehicle seat 50 Seat cushion 6 Rigid break point

Claims (1)

A vehicle seat mounted on the floor in the passenger compartment;
A battery mounted on the floor so as to be positioned under the seat cushion portion of the vehicle seat;
A vehicle battery mounting structure comprising:
Rigidity that enables deformation of the floor so that the battery mounting area descends at a position surrounding the battery mounting area of the floor when a downward load of a predetermined size or more is input from the vehicle seat side. A battery mounting structure for a vehicle, characterized in that a break point is provided.

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