WO2022163054A1

WO2022163054A1 - Vehicle structure body

Info

Publication number: WO2022163054A1
Application number: PCT/JP2021/040888
Authority: WO
Inventors: 良樹柏木; 穣八木
Original assignee: 帝人株式会社
Priority date: 2021-01-26
Filing date: 2021-11-05
Publication date: 2022-08-04
Also published as: JP2024069728A

Abstract

This invention provides a vehicle structure body comprising a battery cover which is arranged in a lower portion of a vehicle body of a vehicle, a floor panel which forms a lower portion of a cabin, and side sills, wherein at least 80% of a projected area S1 of the battery cover also serves as the floor panel, wherein the battery cover is made of fiber reinforced plastic containing reinforcing fibers and resin, and wherein the battery cover is adhered to the side sills. Accordingly, most of the floor panel is replaced with the battery cover so that the weight of the vehicle is reduced and the effect of reducing cost is increased.

Description

vehicle structure

TECHNICAL FIELD The present invention relates to a vehicle structure in which a battery cover arranged in the lower center portion of the vehicle also serves as a floor panel forming the lower portion of the passenger compartment, and the battery cover relates to fiber-reinforced plastic containing reinforcing fibers and resin. be.

In electric vehicles, the on-board battery occupies a considerable amount of weight and installation space, so many studies have been conducted on its structure.

Patent Document 1 provides a battery pack structure for a vehicle, which has a pack structure in which the floor panel also serves as a battery cover, and which suppresses the intrusion of rainwater and mud.

Patent Document 2 describes a vehicle center floor structure in which the battery upper case is integrally connected to the vehicle center floor, thereby reducing the weight and manufacturing cost.

Japanese Patent Application Laid-Open No. 2019-081435 Japanese Patent Application Laid-Open No. 2020-172245

However, when the battery pack structure described in Patent Document 1 is used, since the floor panel serves as a battery cover, quality assurance of the airtightness and watertightness of the battery mounting portion can only be performed while the vehicle is being assembled. Quality control at factories is more difficult than before.

In addition, in the vehicle center floor structure described in Patent Document 2, the part where the battery cover functions as the floor panel is near the center of the floor panel, so the effects of weight reduction and cost reduction are limited.

Therefore, in view of the problems of the prior art, the object of the present invention is to provide a vehicle structure that reduces the weight and cost of the vehicle by replacing most of the floor panel with a battery cover.

As a result of intensive studies, the inventors of the present invention have found that the above problems can be solved by means shown below, and have completed the present invention.
1. A vehicle structure having a battery cover disposed under the vehicle body of the vehicle, a floor panel forming the lower part of the vehicle interior, and a side sill,
At least 80% of the projected area S1 of the battery cover also serves as the floor panel,
The vehicle structure body, wherein the battery cover is made of fiber-reinforced plastic containing reinforcing fibers and resin, and the battery cover is adhered to the side sill.
2. 2. The vehicle structure according to 1, wherein the battery cover forms a groove in the vehicle width direction, and the upper cross member is inserted into the groove.
3. 3. The vehicle structure according to 2 above, wherein a cross section of the upper cross member when viewed in the vehicle width direction has a hat shape that protrudes downward, and the protrusion is inserted into the groove.
4. 4. The vehicle structure according to any one of 2 or 3, wherein the upper cross member is joined to the side sill.
5. A groove is formed in the battery cover in the vehicle width direction, and an upper cross member is arranged along the groove. 2. The vehicle structure according to 1 above.
6. 6. The vehicle structure according to 5, wherein the upper cross member is joined to the side sill.
7. 7. The vehicle structure according to any one of 1 to 6 above, wherein the battery cover is made of fiber-reinforced plastic integrally molded using a sheet molding compound.
8. 8. The vehicle structure according to any one of 1 to 7, wherein the battery cover is adhered to the side sill using a urethane-based adhesive.
9. 9. The vehicle structure according to any one of 1 to 8 above, wherein 90% or more of the projected area S1 of the battery cover also serves as a floor panel forming a lower portion of the vehicle compartment.
10. A method for manufacturing a vehicle structure having a battery cover disposed under a vehicle body of a vehicle, a floor panel forming a lower portion of a vehicle interior, and a side sill, comprising:
At least 80% of the projected area S1 of the battery cover also serves as the floor panel,
The battery cover is made of fiber-reinforced plastic containing reinforcing fibers and resin,
gluing the battery cover to the side sill after pre-bonding the upper cross member to the side sill;
A method for manufacturing a vehicle structure.

In the vehicle structure of the present invention, the battery cover disposed at the bottom of the vehicle body occupies most of the floor panel forming the bottom of the vehicle interior, so the vehicle can be made lighter and less expensive. It has a reduction effect. Furthermore, since the battery cover is glued to the side sills, the side sills have the function of ensuring watertightness, making the most of the space under the floor and securing the battery installation space. This eliminates the need for the weatherstripe described in Patent Document 2, thereby reducing weight and manufacturing costs.

FIG. 2 is an exploded perspective schematic diagram showing an example of a battery box; The perspective schematic diagram which shows an example of a battery tray. A cross-sectional schematic diagram of an example of a battery tray (cross section 202-202 in FIG. 2, cross section where there is no stud bolt base). A cross-sectional schematic diagram of an example of a battery tray (cross section 203-203 in FIG. 2, cross section where there is a stud bolt base). The cross-sectional schematic diagram of an example of a battery tray. The schematic diagram which shows an example of the vehicle structure using a battery cover. (a) A schematic diagram showing a section 601-601 in FIG. (b) Schematic view of (a) enlarged so that the lower cross member can be observed (observed where the ribs are not provided). (c) is a schematic diagram enlarging (a) so that the lower cross member and ribs can be observed. The schematic diagram which looked at an example of the battery cover from the inside. The schematic diagram which showed the direction which a battery tray bends easily. FIG. 2 is a schematic diagram showing an example of a vehicle structure having a protective wall under the battery tray; FIG. 4 is a schematic diagram showing an example of bonding between a battery cover and a battery tray, and a side sill; A model showing that the battery cover forms a groove in the vehicle width direction, and the cross section of the upper cross member when observed in the vehicle width direction is a hat shape that projects downward, and the projection is inserted into the groove. figure. The battery cover forms a groove in the vehicle width direction, and the upper cross member is arranged along the groove. When viewed in the vehicle width direction, the cross section of the upper cross member has a hat shape that is convex upward. A schematic diagram showing a certain thing.

EMBODIMENT OF THE INVENTION Below, although embodiment of this invention is described using drawing, this invention is not restricted to these.
A vehicle structure of the present invention has a battery cover arranged in the lower part of the vehicle body of the vehicle, a floor panel forming the lower part of the passenger compartment, and side sills.
In the vehicle structure of the present invention, since the battery cover and the side sill are joined by adhesion, they are excellent in watertightness. In addition, since at least 80% of the projected area S1 of the battery cover also serves as the floor panel, the weight is excellent and the cost reduction effect is large.
FIG. 11 shows an example of the vehicle structure of the present invention. In FIG. 11, the battery cover 102 and the side sill 1101 are adhered.
INDUSTRIAL APPLICABILITY The vehicle structure of the present invention can be used as a member for constructing a vehicle, and can be used for manufacturing a vehicle.
A vehicle manufactured using the vehicle structure of the present invention includes the vehicle structure of the present invention.

[Battery box]
A battery box 101 arranged in the lower center portion of the vehicle body shown in FIG. 1 includes a battery cover 102 and a battery tray 105 . The battery box 101 is for storing a battery 103 for driving the vehicle.

The battery box 101 may include an energy absorbing member 108 for absorbing impact energy and a cooling mechanism 104 for temperature control. Also, the lower cross member 701 may be inserted into the battery tray 105 .

[Battery cover and floor panel]
A vehicle structure of the present invention is a vehicle structure in which a battery cover disposed under a vehicle body of the vehicle also serves as a floor panel forming a lower portion of a vehicle interior, and the projected area S1 of the battery cover is at least 80%. also serves as a floor panel forming the lower part of the passenger compartment.

It is preferable that 85% or more of the projected area S1 of the battery cover also serves as a floor panel forming the lower part of the passenger compartment, and at least 90% of the projected area S1 of the battery cover also serves as the floor panel forming the lower part of the passenger compartment. More preferably, at least 95% of the projected area S1 of the battery cover also serves as a floor panel forming the lower part of the passenger compartment.

By using the battery cover as the floor panel that forms the lower part of the vehicle compartment, the weight and manufacturing cost of the floor panel can be reduced. In particular, at least 80% of the projected area S1 of the battery cover doubles as the floor panel forming the lower part of the passenger compartment, eliminating the need for a conventional metal floor panel. Most preferably, all floor panels other than the upper cross member are formed by battery covers.

The projected area S1 of the battery cover refers to the area of the battery cover when projected from the vertical direction of the vehicle.
When at least 80% of the projected area S1 of the battery cover also serves as the floor panel, the remaining 20% or less may not form the floor panel.

When viewed from the floor panel side, at least 80% of the projected area S2 of the floor panel is preferably formed by the battery cover, and more preferably at least 90% of the projected area S2 of the floor panel is formed by the battery cover. More preferably, at least 95% of the projected area S2 of the floor panel is formed by the battery cover. When at least 80% of the projected area S2 of the floor panel is formed by the battery cover, the remaining 20% or less is preferably formed by other parts.

[Battery cover: adhesion to side sill]
The battery cover of the present invention is adhered to the side sill. As a result, the side sills have the function of ensuring watertightness, making the most of the space under the floor and securing the battery installation space. A state in which the battery cover 102 is adhered to the side sill 1101 is shown at 1102 in FIG.

　When attaching the battery cover to the side sill, it is preferable to use a urethane-based adhesive. The front side of the floor panel should be glued to the dash panel or the like. In the case of a vehicle body having a rear floor panel under the rear seat or under the trunk, the floor panel of the present invention preferably refers to the center floor panel, and the back of the center floor panel may be adhered to the rear floor panel or the like.

[Battery cover and upper cross member]
In the vehicle structure of the present invention, the battery cover 102 preferably forms a groove in the vehicle width direction, and the upper cross member (1201 in FIG. 12) is preferably inserted into the groove (FIG. 12). A "cross" means a member whose longitudinal direction is the vehicle width direction (the Y-axis direction in FIG. 1).

The shape of the upper cross member is not particularly limited, but when the cross section of the upper cross member is observed from the vehicle width direction (the Y-axis direction in FIG. 2), the cross-sectional shape is T-shaped, L-shaped, or a combination thereof. good too.

It is preferable that the cross-section of the upper cross member when viewed in the vehicle width direction has a hat shape that is downwardly convex, and that the convex is inserted into the groove (Fig. 12). The term "inserted" means to be provided by inserting, but the insertion does not have to be completely inserted, and a part of the protrusion may be inserted. Also, the top of the inserted upper cross member and the bottom of the groove of the battery cover may or may not be in contact with each other. If the apex of the inserted upper cross member and the bottom of the groove in the battery cover do not contact each other, it is possible to avoid hitting noise between the upper cross member and the battery cover during running. Also, the configuration of FIG. 12 allows the upper cross member to be installed below the vehicle body. When a seat is attached to the upper cross member, the upper cross member can be installed downward, and the seat can be installed downward in the vehicle body, creating a space above the passenger's head.

On the contrary, the battery cover forms a groove in the vehicle width direction, and the upper cross member (1201 in FIG. 13) is arranged along the groove, and the cross section of the upper cross member when observed in the vehicle width direction is It may have a hat shape that is convex upward (FIG. 13). This creates a space 1301 in FIG. 13, which contributes to an improvement in structural rigidity. Here, "along the groove" does not need to be completely along, but may be substantially along.

[Upper cross member: Joint]
The upper cross member is preferably joined to the side sill, more preferably directly fastened to the side sill. By pre-joining the upper cross member to the side sill, which is the body frame, it becomes easier to produce even without a floor. In other words, it is preferable to retrofit the battery box to the vehicle body frame in which the upper cross member is joined to the side sill.

　The upper cross member should preferably be joined to the battery cover, and should be adhered with an adhesive. The bonding area is indicated at 1202 in FIG. 12 and 1302 in FIG. 13, for example. Adhesion eliminates the need to make a hole in the battery cover 102 compared to fastening, improving airtightness.

[Upper cross member: material]
The upper cross member is preferably metal or continuous fiber reinforced composite. When using a continuous fiber reinforced composite material, the fibers are preferably oriented in the vehicle width direction (the Y-axis direction in FIG. 1). The metal may be an alloy.

[Upper cross member: thickness]
The thickness of the upper cross member is preferably 0.5 mm or more and 6.0 mm, preferably 1.0 mm or more and 5.0 mm or less, and preferably 1.0 mm or more and 4.0 mm or less.

[Fiber-reinforced plastic]
The battery cover 102 is made of fiber-reinforced plastic containing reinforcing fibers and resin. Similarly, the battery tray 105 is also preferably made of fiber-reinforced plastic containing reinforcing fibers and resin. The reinforcing fibers contained in the battery cover 102 or the battery tray 105 and the fiber-reinforced plastics used will be described in detail below.

1. Reinforcing Fibers The reinforcing fibers contained in the fiber-reinforced plastic are not particularly limited, but are preferably one or more reinforcing fibers selected from the group consisting of carbon fibers, glass fibers, aramid fibers, boron fibers, and basalt fibers. More preferably, the reinforcing fibers are glass fibers. When glass fibers are used as reinforcing fibers, the average fiber diameter of the glass fibers is preferably 1 μm to 50 μm, more preferably 5 μm to 20 μm. When the average fiber diameter is large, the impregnation of the resin into the fibers becomes easy, and when the average fiber diameter is below the upper limit, moldability and workability become good.

2. Discontinuous Fibers Preferably, the reinforcing fibers comprise discontinuous fibers. When discontinuous fibers are used, shapeability is improved compared to fiber-reinforced plastics using only continuous fibers, making it easier to produce complex molded articles.

3. Weight Average Fiber Length of Reinforcing Fiber The weight average fiber length of the reinforcing fiber is preferably 1 mm or more, more preferably 1 mm or more and 100 mm or less, still more preferably 1 mm to 70 mm, and even more preferably 1 mm to 50 mm.

In recent years, on-vehicle batteries have become larger, with the vertical and horizontal dimensions of the battery box becoming 1m x 1m or 1.5m x 1.5m. If the weight-average fiber length is 1 mm or more, it is easy to ensure mechanical properties for storing a large battery even when such a large battery box is produced. If the weight-average fiber length of the reinforcing fibers in the battery tray of the present invention is 1 mm or more, it becomes easy to impart structural rigidity to the battery tray itself.

In addition, in fiber-reinforced plastics produced by injection molding, the weight-average fiber length of reinforcing fibers is about 0.1 to 0.3 mm. Therefore, when the weight average fiber length of the reinforcing fibers is 1 mm or more and 100 mm or less, it is preferable to produce the fiber reinforced plastic by press molding.

It is preferable to set the weight average fiber length of the reinforcing fibers to 100 mm or less because it has excellent fluidity.

In the present invention, discontinuous reinforcing fibers having different fiber lengths may be used together. In other words, the discontinuous reinforcing fibers used in the present invention may have a single peak or multiple peaks in the weight-average fiber length distribution.

4. Fiber Volume Ratio The fiber volume ratio Vf of the reinforcing fibers is not particularly limited, but is preferably 20 to 70%, more preferably 25 to 60%, and even more preferably 30 to 55%. The fiber volume ratio (Vf unit: volume %) is the ratio of the volume of the reinforcing fiber to the total volume including not only the reinforcing fiber and the matrix resin but also other additives.

5. Resin In the present invention, the type of resin is not particularly limited, and thermosetting resins and thermoplastic resins are used. When a thermosetting resin is used, it is preferably an unsaturated polyester resin, vinyl ester resin, epoxy resin, or phenol resin. As the resin, one type may be used alone, or two or more types may be used in combination.

6. Other Agents In the fiber reinforced resin used in the present invention, various fibrous or non-fibrous fillers of organic fibers or inorganic fibers, inorganic fillers, flame retardants, and UV-resistant agents are contained within a range that does not impair the purpose of the present invention. , stabilizers, release agents, pigments, softeners, plasticizers, surfactants and the like.
When using a thermosetting resin, it may contain a thickener, a curing agent, a polymerization initiator, a polymerization inhibitor, and the like.
As the additive, one type may be used alone, or two or more types may be used in combination.

7. Integral molding Fiber-reinforced plastic is integrally molded. Integral molding means that it is molded continuously without joints and is not molded by joining separate members. . In such integral molding, a fiber-reinforced plastic is produced by one-time molding, and is preferably realized by press molding. A sheet molding compound (sometimes referred to as SMC) may be used for integral molding to create a fiber-reinforced plastic.

Because it is created by integral molding, separate parts can be processed as one part, making it possible to reduce the unit price of parts. In addition, the number of assembling processes is reduced, and the reduction in the number of parts also enables a reduction in inventory costs.

8. Minimum thickness of fiber-reinforced plastic In the present invention, the minimum thickness of the fiber-reinforced plastic is preferably 1.0 mm or more and less than 5 mm, more preferably 1.5 mm or more and less than 5 mm, further preferably 2 mm or more and less than 5 mm, and 3 mm or more. Less than 5 mm is even more preferred. If it is less than 5 mm, it is preferable from the viewpoint of weight reduction of the battery box. When the thickness of the fiber-reinforced plastic is 1.0 mm or more, the battery temperature is less likely to be affected by the outside air temperature.

For battery trays, preferably the minimum thickness of the fiber-reinforced plastic is 2 mm or more and less than 5 mm, more preferably 3 mm or more and less than 5 mm.
For battery covers, preferably the minimum thickness of the fiber-reinforced plastic is between 1 mm and 4 mm, more preferably between 1 mm and 3 mm.

9. Sheet Molding Compound The fiber-reinforced plastic of the present invention is preferably formed by molding a sheet molding compound (sometimes referred to as SMC) using reinforcing fibers. Due to its high moldability, sheet molding compounds can be easily molded into complex shapes such as battery trays and battery covers.

That is, it is possible to manufacture a battery tray having an uneven shape by molding a sheet molding compound to manufacture fiber-reinforced plastic. Sheet molding compounds have higher fluidity and formability than continuous fibers, and can easily form ribs and bosses.

As a fiber-reinforced plastic using a sheet molding compound (SMC), a sheet molding compound manufactured by Continental Structural Plastics (sometimes abbreviated as CSP) can be used.

[Battery tray]
The vehicle structure preferably includes a battery tray made of fiber-reinforced plastic containing reinforcing fibers and resin, and the battery tray preferably satisfies the following configuration.
(1) a first bottom surface portion, a peripheral wall erected on the outer periphery of the first bottom surface portion, a first inner wall connected to the first bottom surface portion, a second inner wall connected to the first bottom surface portion, and the A second bottom surface part connected to both the first inner wall and the second inner wall and raised from the first bottom surface part,
(2) the first bottom surface portion, the peripheral wall, the first inner wall, the second inner wall, and the second bottom surface portion are made of integrally molded fiber-reinforced plastic;
(3) A concave portion extending in the vehicle width direction is formed by the first inner wall, the second inner wall portion, and the second bottom portion.

A detailed description will be given below using the reference numerals drawn in the drawings.
The battery tray 105 includes a first bottom surface portion 303 and a peripheral wall 205 erected on the outer periphery of the first bottom surface portion 303 . In addition, a first inner wall 206 connected to the first bottom surface portion 303, a second inner wall 207 connected to the first bottom surface portion 303, and a second inner wall 207 connected to both the first inner wall 206 and the second inner wall 207 It has a second bottom surface portion 301 raised from one bottom surface portion.
The first bottom surface portion 303, the peripheral wall 205, the first inner wall 206, the second inner wall 207, and the second bottom surface portion 301 are made of integrally molded fiber reinforced plastic.
In this way, since the internal dividing wall 107 is formed by the first internal wall 206 and the second internal wall 207, even if the internal dividing wall is formed high from the bottom surface, the wall including the reinforcing fibers up to the tip can be easily manufactured. .

[Flange]
The battery tray 105 comprises, for example, a flange 402 shown in FIG. The flange of the battery tray 105 can be used when tightening together with the battery cover 102 and the energy absorbing member 108 .
The battery cover 102, the battery tray 105, and preferably the energy absorbing member 108 can be fastened together. FIG. 6 shows the fastened state.

[First bottom part]
The bottom surface of the first bottom surface portion 303 is the bottom surface of the battery tray 105 . A battery may be placed on the upper surface of the first bottom surface portion 303, or a space may be provided between the battery and the first bottom surface portion, and a cooling mechanism 104 and a ventilation mechanism may be provided. Moreover, the first bottom surface portion does not need to be a perfect flat plate shape, and may be corrugated like a corrugated shape, or may have a curved surface.

[Surrounding wall]
The peripheral wall 205 is erected on the outer circumference of the first bottom surface portion 303 and is preferably formed continuously with the surface of the first bottom surface portion 303 .

[First inner wall and second inner wall]
The first inner wall 206 connects with the first bottom portion 303 . The first bottom portion 303 is bent and connected to the first inner wall 206 . The first bottom surface portion 303 is continuously connected to the first inner wall 206, and the first bottom surface portion 303 and the first inner wall 206 are seamlessly integrally formed.

Similarly, the second inner wall 207 connects with the first bottom surface portion 303 . The first bottom portion 303 is bent and connected to the second inner wall 207 . The first bottom surface portion 303 is continuously connected to the second inner wall 207, and the first bottom surface portion 303 and the second inner wall 207 are seamlessly integrally formed. If fiber reinforced plastic is used, it can be easily seamlessly molded integrally.

It is preferable that the first inner wall portion 206 is connected to the first bottom surface portion 303 while crossing the first bottom surface portion 303 . Similarly, the second inner wall 207 is preferably connected to the first bottom surface portion 303 while intersecting from the first bottom surface portion 303 . Here, “intersect” means a state in which the first bottom surface portion 303 intersects with the first inner wall portion 206 and the second inner wall portion 207 in a two-dimensional plane for cross-sectional observation of the battery tray. .

[Internal dividing wall]
The first inner wall 206 and the second inner wall 207 form the inner dividing wall 107 shown in FIG. 1 that divides the interior of the battery tray 105 . There may be two or more such internal dividing walls 107 . In FIGS. 1 and 2, the internal dividing walls 107 are formed in the Y-axis direction and extend four in all. It is preferable that the X-axis in FIGS. 1 and 2 is the axle direction (the traveling direction of the vehicle), and the Y-axis is the vehicle width direction.

[Stud bolt stand]
The battery tray 105 may include stud bolt mounts 407 connected to both the first inner wall 206 and the second inner wall 207 and raised from the first bottom surface portion 303 . The stud bolt base 407 is made of fiber-reinforced plastic integrally formed with the first bottom surface portion 303 , the peripheral wall 205 , the first inner wall 206 , the second inner wall 207 and the second bottom surface portion 301 . The stat bolt mount 407 preferably connects to both the first inner wall 206 and the second inner wall 207 and is raised from the first bottom portion 303 . The first inner wall portion 206 and the second inner wall portion 207 may be connected via a stud bolt base 407 .

In other words, the battery tray 105 includes the flange 402, the first bottom surface portion 303, the peripheral wall 205 erected on the outer periphery of the first bottom surface portion 303, the first inner wall 206 connected to the first bottom surface portion 303, the first bottom surface portion A second inner wall 207 connected to 303 and a stud bolt mount 407 connected to both the first inner wall 206 and the second inner wall 207 and raised from the first bottom portion 303 are preferably provided.

When the battery tray 105 is provided with the stud bolt base 407, there is no need to provide it as a separate part. Since the battery tray 105, which is a component of the battery box 101, is made of integrally molded fiber-reinforced plastic, the stud bolt base 407 is provided at the same time as the molding of the fiber-reinforced plastic is completed.

[Integrated molding]
The first bottom surface portion 303, the peripheral wall 205, the first inner wall 206, the second inner wall 207, and the second bottom surface portion 301 are made of integrally molded fiber reinforced plastic. In a preferred form, a stud bolt mount 407 for fixing the battery can also be integrally molded, and further flange 402, first bottom part 303, peripheral wall 205, first inner wall 206, second inner wall 207, and stud bolt mount 407. is made of integrally molded fiber reinforced plastic.

Here, integral molding means that these are continuously molded without joints, and are not molded by joining separate members. In such integral molding, a fiber-reinforced plastic is produced by one-time molding, and is preferably realized by press molding. A sheet molding compound (sometimes referred to as SMC) may be used for integral molding to create a fiber-reinforced plastic.

[Second bottom part]
The first inner wall 206 and the second inner wall 207 are also connected via the second bottom surface portion 301, and the second bottom surface portion 301 is raised by the first inner wall 206 and the second inner wall 207. is preferred. In other words, the first inner wall portion 206 and the second inner wall portion 207 form the inner dividing wall 107 , and the second bottom portion 301 is the top bottom portion of the inner dividing wall 107 .

FIG. 3 is a cross-sectional view taken along line 202-202 of FIG. ing.
Since FIG. 3 is a sectional view of a place where it is not necessary to provide the stud bolt insertion hole 412, the stud bolt base 407 is not drawn.
The opposite surface of the second bottom surface portion 301 may be covered with a metal cover 304 to improve rigidity.

[Height of the second bottom part]
A height h1 from the first bottom surface to the flange and a height h3 from the first bottom surface to the top surface of the second bottom surface are preferably h1×0.3<h3<h1×2.0. The heights of h1 and h3 are illustrated in FIG. If the second bottom surface is a curved surface, etc., measure the length that maximizes h3.

If h1×0.3<h3, the height of the internal dividing wall is high, so the battery (103) can be held stably. The lower limit of h3 is more preferably h1×0.5<h3, still more preferably h1×0.6<h3, and even more preferably h1×0.7<h3.

The upper limit of h3 is more preferably h3<h1×1.8, still more preferably h3<h1×1.5, even more preferably h3<h1×1.2, and most preferably h3<h1×1.0.

[Lower cross member]
In the vehicle structure of the present invention, a lower cross member (reference numeral 701) may be inserted into the battery tray 105 as shown in FIG. In this specification, the cross member inserted into the battery tray 105 is referred to as a lower cross member to distinguish it from the upper cross member arranged on the battery cover.

In the vehicle structure of the present invention, the floor panel that has been used conventionally can be eliminated by having the battery cover also serve as the floor panel. At this time, the impact absorbing power from the side surface is lowered. To compensate for this, it is preferable to use a lower cross member.

As shown in FIG. 7, the lower cross member is preferably inserted into the recess 208 shown in FIG. 2 of the battery tray 105 and extends in the vehicle width direction. The term "cross" means a member whose longitudinal direction is the vehicle width direction (the Y-axis direction in FIG. 1).

[Lower cross member: Arrangement]
Specifically, the first inner wall 206, the second inner wall portion 207, and the second bottom surface portion 301 form a recess 208 extending in the vehicle width direction. Preferably, member 701 is inserted. The recess 208 forms a spatial region 313 surrounded by the first inner wall 206 , the second inner wall 206 and the second bottom portion 301 . The lower cross member can be inserted into at least one of the recesses provided in the battery tray by utilizing the flexibility of the shape of the battery tray integrally molded of fiber-reinforced plastic.

After inserting the lower cross member 701 into the recess 208 , it is preferable to have a space 703 between it and the second bottom surface portion 301 . By having the space 703 , it is possible to avoid hitting sounds caused by the lower cross member 701 and the battery tray 105 .

It is preferable that a plurality of lower cross members 701 exist, and the first inner wall 206, the second inner wall portion 207, and the second bottom surface portion 301 allow the lower cross members 701 to be positioned at two or more locations in the recess 208 extending in the vehicle width direction. is inserted. It is even more preferable if all recesses 208 are filled with lower cross members.

The lower cross member 701 preferably extends in the vehicle width direction of the battery tray 105, and as shown in FIG. 2, extends from one end of the battery tray 105 in the vehicle width direction to the opposite end. Good.

[Lower cross member: shape]
The shape of the lower cross member is not particularly limited, but when the cross section of the lower cross member is observed from the vehicle width direction (the Y-axis direction in FIG. 2), the cross-sectional shape is T-shaped, L-shaped, or a combination thereof. good too. The lower cross member is bent in a convex shape along a concave portion 208 formed by the first inner wall 206, the second inner wall portion 207, and the second bottom surface portion 301 so as to extend in the vehicle width direction. is preferred. In other words, when the cross section of the vehicle structure is observed in the vehicle lateral direction, it is preferable that the lower cross member is bent to form an upward protrusion and is inserted into the recess 208 . FIG. 7 illustrates a curved lower cross member 701 . It is preferable that the lower cross member 701 is bent in a convex shape along the concave portion 208 by pressing a flat metal plate. Here, "along the concave portion" does not need to be completely along, but may be substantially along.

When observing the cross section of the vehicle structure from the vehicle width direction, a closed cross-sectional structure 703 as shown in FIG. preferably formed. In order to avoid hitting sound between the lower cross member 701 and the second bottom surface 301 , it is preferable that the convex height of the lower cross member 701 is set so as not to contact the second bottom surface 301 .

[Lower cross member: Mitsugo]
Lower cross member 701 preferably extends in the vehicle width direction and is fitted into recess 208 . At this time, the lower cross member 701 preferably has a convex shape as shown in FIG. That is, it is preferable that the convex portion of the lower cross member 701 is fitted with the concave portion 208 extending in the vehicle width direction by means of the first inner wall 206, the second inner wall portion 207, and the second bottom surface portion 301. .

[Lower cross member: joining]
The lower cross member 701 is preferably joined to the first bottom surface portion 303, and may be adhered with an adhesive. Adhesion eliminates the need to make a hole in the battery tray 105 and improves airtightness compared to fastening.

By inserting the lower cross member into the battery tray 105 and joining it to the battery tray, when the side of the vehicle receives an impact, the structural rigidity of the battery tray can be used in addition to the vehicle body.

[Lower cross member: material]
Lower cross member 701 is preferably a metal or continuous fiber reinforced composite. When using a continuous fiber reinforced composite material, the fibers are preferably oriented in the vehicle width direction (the Y-axis direction in FIG. 2). The metal may be an alloy.

[Lower cross member: thickness]
The thickness of the lower cross member 701 is preferably 0.5 mm or more and 6.0 mm or less, preferably 1.0 mm or more and 5.0 mm or less, and preferably 1.0 mm or more and 4.0 mm or less.

[Effect of lower cross member arrangement]
The battery tray 105 includes a recess 208 that defines a spatial region 313 surrounded by the first inner wall 206 , the second inner wall 207 and the second bottom surface 301 . Due to the recess 208, the battery tray 105 tends to bend in the vertical direction. The bending in the vertical direction is, more specifically, the bending in the direction of the arrow 901 in FIG. 9, which is the bending of the end portion of the battery tray 105 in the longitudinal direction of the vehicle.

By inserting the lower cross member 701 into the recessed portion 208 of the battery tray 105 and joining the first bottom surface portion 303 and the lower cross member 701, bending in the vertical direction (direction of arrow 901 in FIG. 9) due to vibration can be controlled. If the lower cross member 701 extends in the vehicle width direction and is fitted and joined to the recess 208, this bending can be further controlled.

[Ribs on recess of battery tray]
As shown in FIG. 7C, the vehicle structure of the present invention preferably has a rib 702 integrally formed with the battery tray 105 in at least one portion of the recess 208 . In other words, it is preferable to provide a rib 702 in at least one location of the recessed portion 208 extending in the vehicle width direction by the first inner wall 206, the second inner wall portion 207, and the second bottom surface portion 301. . More preferably, the rib 702 is intermittently provided with a plurality of ribs in the extending recess 208 in the extending direction. Note that FIG. 7C depicts a portion of the concave portion of the battery tray 105 with the rib 702 , but FIG. 7B depicts a portion of the concave portion of the battery tray 105 without the rib 702 .

The thickness of the rib 702 in the concave portion 208 of the battery tray 105 is preferably 1 mm or more and 4 mm or less, more preferably 2.5 mm or more and 3 mm. The height of the rib 702 is preferably 10 mm or more and 30 mm or less. The thickness of the rib 702 is the length in the Y-axis direction in FIG. 7, and the height of the rib 702 is the length in the Z-axis direction in FIG.
By providing the rib 702 in the concave portion 208 of the battery tray 105, bending in the vertical direction (the direction of the arrow 901 in FIG. 9) due to vibration can be controlled.

[Natural frequency of primary mode of battery tray]
It is preferable that the primary mode natural frequency of the battery tray 105 is 25 Hz or more. Since the natural frequency of the vehicle body is generally 25 Hz or less, it is preferable to design so as not to resonate with the vehicle body. The natural frequency of the primary mode of the battery tray 105 is more preferably 30 Hz or higher, still more preferably 35 Hz or higher, and even more preferably 40 Hz or higher.

More specifically, it is preferable that at least one portion of the concave portion 208 is provided with a rib 702 that is integrally formed with the battery tray 105, and that the natural frequency of the primary mode of the battery tray 105 is 25 Hz or higher. Since the battery tray 105 has the concave portion 208, the natural frequency of the primary mode can be easily set to 25 Hz or higher. , can more easily be 25 Hz or higher.

It is preferable that the rib 702 and the lower cross member 701 do not contact each other and that there is a space between them. By not contacting each other, it is possible to avoid hitting noise between the rib 702 and the lower cross member 701 .

Note that when focusing only on vibration control, there is no problem even without the lower cross member 701, so the following invention will be described as the battery tray 105 in which the lower cross member 701 is removed from the vehicle structure of the present invention.

[Battery tray with ribs]
The battery tray 105 preferably satisfies the following configuration.
(1) First bottom surface portion 303, peripheral wall 205 erected on outer periphery of first bottom surface portion 303, first inner wall 206 connected to first bottom surface portion 303, second inner wall connected to first bottom surface portion 303 207, and a second bottom portion 301 connected to both the first inner wall 206 and the second inner wall 207 and raised from the first bottom portion 303;
(2) The first bottom surface portion 303, the peripheral wall 205, the first inner wall 206, the second inner wall 207, and the second bottom surface portion 301 are formed of integrally molded fiber reinforced plastic,
(3) The first inner wall 206, the second inner wall portion 207, and the second bottom surface portion 301 form a recessed portion 208 extending in the vehicle width direction,
(4) At least one portion of the concave portion 208 is provided with a rib integrally formed with the battery tray 105 .

[angle]
The angle between the first bottom surface portion 303 and the first inner wall 206 is exemplified by α in FIG. The angle between the first bottom surface portion 303 and the second inner wall 207 is exemplified by β in FIG.
The angle α between the first bottom surface portion 303 and the first inner wall 206 and the angle β between the first bottom surface portion 303 and the second inner wall 207 are preferably 90 degrees or more and 135 degrees or less. When the angle is 90 degrees or more, it becomes easy to remove from the mold during molding. On the contrary, if the angle is 135 degrees or less, even if the shape of the battery 103 is a rectangular parallelepiped or a cube, the first inner wall 206 and the second inner wall 207 are not bent to the battery 103. easier to match with the shape of

In other words, if the angle α between the first bottom surface portion 303 and the first inner wall 206 and the angle β between the first bottom surface portion 303 and the second inner wall 207 are 90 degrees or more and 135 degrees or less, the unit The size of the battery 103 can be increased relative to the battery tray 105 per volume.

The angle α formed between the first bottom surface portion 303 and the first inner wall 206 and the angle β formed between the first bottom surface portion 303 and the second inner wall 207 are more preferably 90 degrees or more and 120 degrees or less, and more preferably 90 degrees or more and 100 degrees. degree or less is more preferable.

The cross section of the battery tray 105 should be observed to measure the angle α between the first bottom surface portion 303 and the first inner wall 206 and the angle β between the first bottom surface portion 303 and the second inner wall 207 . The direction of cross-sectional observation is preferably a direction perpendicular to the first inner wall 206 or the second inner wall 207 (for example, cross-sectional observation in FIG. 4).

When observing the cross section, if the first bottom surface portion 303, the first inner wall 206, or the second inner wall 207 has a curved shape, draw a tangent line to the curve, measure the angle with the tangent line, and measure the maximum angle The angle α and the angle β are calculated by averaging the two points, ie, the location where the angle is the minimum angle and the location where the angle is the minimum angle.

[Stud bolt and stud bolt base]
The battery tray 105 of the present invention preferably has a stud bolt base 407 with stud bolts 409 for attaching battery brackets. The first inner wall 206 and the second inner wall 207 are connected via the stud bolt base 407 . In other words, it is preferable to have stud bolt mounts 407 at various points on the top of the internal dividing wall 208 .
Further, the stud bolt base 407 preferably has a non-through insertion hole 412 into which the stud bolt 409 is inserted.

The stud bolt 409 is a bolt with threaded portions at both ends, and one end is screwed into the insertion hole of the stud bolt base 407 . A battery bracket 411 for fixing the battery is fastened on the opposite side. The shape of the stud bolt 409 is not particularly limited.

The thickness t1 of the stud bolt base 407 shown in FIG. 5 and the thickness t2 of the second bottom surface portion 301 shown in FIG. 3 are preferably t2<t1. In other words, the thickness of the top portion 201 of the internal dividing wall 208 formed by the first internal wall portion 206 and the second internal wall 207 has an uneven thickness structure in the Y-axis direction (vehicle width direction). (It is preferable that the thickness of the portion where the stud bolt 409 is inserted is greater than the thickness of the other portions). The top portion 201 preferably has a repeated structure of the stud bolt base 407 and the second bottom portion 301 . By designing the thickness t2 of the second bottom portion to be thinner than the thickness t1 (also referred to as the wall thickness) of the stud bolt base, the weight of the battery tray 105 can be reduced. t2×0.8<t1 is more preferable, and t2×0.5<t1 is even more preferable.

The flange 402, the first bottom surface portion 303, the peripheral wall 205, the first inner wall 206, the second inner wall 207, the stud bolt base 407, and the second bottom surface portion 301 are integrally formed of fiber reinforced plastic.

[Through hole for fixing the battery]
In the case of a conventional battery tray, in order to fasten the battery to the battery tray, it was necessary to provide a through hole in the battery tray and fix the battery bracket there.
In a preferred embodiment of the present invention, the stud bolt base 407 is made of fiber-reinforced plastic integrally molded with the battery tray 105, and has a thick uneven thickness structure. That is, through holes for fixing the battery 103 can be eliminated from the first inner wall 206 , the second inner wall 207 , the first bottom surface portion 303 , and the stud bolt base 407 . By not providing such a through-hole, the airtightness of the battery box 101 can be improved, the humidity inside the battery box 101 can be stabilized, and the life of the battery can be extended. Also, it is preferable that the peripheral wall 205 does not have a through hole for fixing the battery 103 .

[Height of stud bolt base]
The height h1 from the first bottom surface portion 303 to the flange 402 and the height h2 from the first bottom surface portion 303 to the top surface of the stud bolt base 407 satisfy h1×0.3<h2<h1×2.0. is preferred.

Since the first bottom surface portion 303 has a thickness, the height h1 is measured based on the center of the first bottom surface portion 303 in the vertical direction. When the first bottom surface portion 303 is wavy like a corrugated shape or has a curved surface, the length at which h2 becomes the maximum is measured and defined as h2.
The heights of h1 and h2 are illustrated in FIG.

If h1×0.3<h2, the position of the stud bolt base 407 is higher than the first bottom surface portion 303, so the position of the stud bolt 409 for attaching the battery bracket 411 can be higher. As a result, the fixing position of the battery bracket 411 for fixing the battery becomes higher, so the length of the battery bracket 411 can be shortened. Since the battery bracket 411 is usually made of metal such as aluminum, shortening it can contribute to weight reduction.

The lower limit of h2 is more preferably h1×0.5<h2, still more preferably h1×0.6<h2, and even more preferably h1×0.7<h2.

The upper limit of h2 is more preferably h2<h1×1.8, still more preferably h2<h1×1.5, even more preferably h2<h1×1.2, and most preferably h2<h1×1.0.

If h1×0.3<h2<h1×2.0, as shown in FIG. growing. If this space area 313 is large, it becomes easy to insert the lower cross member 701 even if the stud bolt base 407 is provided.

The relationship between the height h2 from the first bottom surface portion 303 to the top surface of the stud bolt base 407 and the height h3 from the first bottom surface portion 303 to the top surface of the second bottom surface portion 301 is h2×0.8<h3< It is preferably h1×1.2, more preferably h2×0.9<h3<h1×1.1, and even more preferably h2 and h3 are the same.

[Ribs and bosses for fixing the battery]
A rib or boss for fixing the battery 103 is preferably provided on the upper surface of the first bottom surface portion 303 of the battery tray 105 . The upper surface of the first bottom surface portion is the surface on which the batteries are placed on the battery tray 105 . The bottom surface is the opposite surface of the top surface. The ribs or bosses preferably fix the wiring and the cooling mechanism 104 as well as the battery.
Here, "fixing" means restraining movement of the battery, and does not mean complete fixing.

The rib height hr is preferably hb×0.3<hr, more preferably hb×0.5<hr, with respect to the battery height hb. More specifically, the rib height hr is preferably 20 to 70 mm, more preferably 30 to 60 mm, even more preferably 40 to 50 mm. Within this range, the rigidity of the battery tray 105 can be improved.

Also, the ribs or bosses for fixing the battery are preferably integrally molded as fiber-reinforced plastic. By providing ribs or bosses integrally with the fiber reinforced plastic, the fixation of the battery can be easily strengthened.

[Shape of first inner wall and second inner wall]
1. Conforming to Battery Shape At least one of the first inner wall 206 or the second inner wall 207 preferably has a shape that conforms to the shape of the battery. More preferably, the first inner wall 206 and the second inner wall 207 have a shape that follows the shape of the battery. In other words, it is more preferable that the internal dividing wall 208 has a shape that follows the shape of the battery.

The following shape means designing the shape of the first inner wall 206 or the second inner wall 207 along the shape of the battery. Alternatively, the second inner wall 207 becomes a straight wall.

Also, for one battery, a first inner wall and a second inner wall may be provided so as to follow the shape of the battery (along the periphery of the battery). By providing an internal dividing wall (formed by the first internal wall and the second internal wall) for each battery, even if a problem such as combustion occurs in one battery, the effect will not reach the other batteries. preferable. In FIG. 2, the first inner wall (206) and the second inner wall (207) are drawn only in the vehicle width direction (Y-axis direction in FIG. 2), but in the running direction (X-axis direction in FIG. 2). May be extended.

2. Attachment to Lower Body The battery tray 105 in the present invention is attached to the lower body of the electric vehicle, and preferably has a first inner wall 206 and a second inner wall 207 along the vehicle width direction. By designing in this way, the lower cross member can be easily installed in the vehicle width direction.

Here, the vehicle width direction is, for example, the Y-axis direction in FIG. 1, which is the vehicle width direction. It is also called the left-right direction of the vehicle body. For example, in FIG. 1, an internal dividing wall 107, which is a first internal wall and a second internal wall, extends in the vehicle width direction.

[Dispersion of discontinuous fibers in boundary region]
Discontinuous fibers are continuously dispersed in boundary regions between the first bottom surface portion 303 and the first inner wall 206, the first bottom surface portion 303 and the second inner wall 207, and the first bottom surface portion 303 and the peripheral wall 205. is preferred.

Since the first bottom surface portion 303, the peripheral wall 205, the first inner wall 206, and the second inner wall 207 are integrally formed of fiber-reinforced plastic, discontinuous fibers can be easily and continuously dispersed in the boundary region.

"The reinforcing fibers are continuously dispersed in the boundary region" means that they are continuously dispersed in at least a part of the boundary region, and need not be continuously dispersed in the entire boundary region.

In the boundary area, if the reinforcing fibers are continuously dispersed in the in-plane direction, the mechanical properties of the boundary area are improved compared to conventional ones.

If partition walls corresponding to the first inner wall portion 206 and the second inner wall portion 207 were attached as separate parts without integrally molding the battery tray 105 , fastening with the first bottom surface portion 303 was required.
However, if the internal dividing wall is attached as a separate part without integral molding, the fastening force with the first bottom surface portion 303 will inevitably become low and unstable.

[Curvature radius of inner corner]
In the boundary area between the first bottom surface portion 303 and the peripheral wall 205, it is preferable to form an inner corner portion with a curvature radius of 1 mm or more and 10 mm or less. A more preferable radius of curvature is 1 mm or more and 7 mm or less, and a further preferable radius of curvature is 2 mm or more and 4 mm or less.

The inner corner portion in the boundary area between the first bottom surface portion 303 and the peripheral wall 205 is exemplified by R501 in FIG.

Also in the boundary region between the first bottom surface portion 303 and the first inner wall 206, it is preferable to form an inner corner portion with a radius of curvature of 1 mm or more and 10 mm or less. The inner corner portion at the boundary region between the first bottom surface portion 303 and the first inner wall 206 is illustrated by R520 in FIG. A more preferable radius of curvature is 1 mm or more and 7 mm or less, and a further preferable radius of curvature is 2 mm or more and 4 mm or less.

Also in the boundary area between the first bottom surface portion 303 and the second inner wall 207, it is preferable to form an inner corner portion with a curvature radius of 1 mm or more and 10 mm or less. The inner corner portion in the boundary area between the first bottom surface portion 303 and the second inner wall 207 is exemplified by R530 in FIG. A more preferable radius of curvature is 1 mm or more and 7 mm or less, and a further preferable radius of curvature is 2 mm or more and 4 mm or less.

[Curvature radius of outer corner]
In the boundary area between the first bottom surface portion 303 and the peripheral wall 205, it is preferable to form an outer corner portion with a curvature radius of 2 mm or more and 11 mm or less. A more preferable radius of curvature is 2 mm or more and 8 mm or less, and a further preferable radius of curvature is 3 mm or more and 7 mm or less.

The outer corner portion in the boundary area between the first bottom surface portion 303 and the peripheral wall 205 is exemplified by R502 in FIG.

Also in the boundary area between the first bottom surface portion 303 and the first inner wall 206, it is preferable to form an outer corner portion with a radius of curvature of 2 mm or more and 11 mm or less. The outer corner portion in the boundary area between the first bottom surface portion 303 and the first inner wall 206 is illustrated by R521 in FIG. A more preferable radius of curvature is 2 mm or more and 8 mm or less, and a further preferable radius of curvature is 3 mm or more and 7 mm or less.

Also in the boundary region between the first bottom surface portion 303 and the second inner wall 207, it is preferable to form an outer corner portion with a radius of curvature of 2 mm or more and 11 mm or less. The outer corner portion in the boundary area between the first bottom surface portion 303 and the second inner wall 207 is illustrated by R531 in FIG. A more preferable radius of curvature is 2 mm or more and 8 mm or less, and a further preferable radius of curvature is 3 mm or more and 7 mm or less.
It is preferable that the radius of curvature of the outer corner is larger than that of the inner corner.

[Energy absorbing member]
The vehicle structure of the present invention preferably includes an energy absorbing member 108 which is a member capable of absorbing energy outside the peripheral wall of the battery tray 105 .

The size of the battery box 101 is increasing year by year due to the increase in the amount of batteries installed in automobiles. The length of the battery box 101 in the vehicle width direction is often 70% or more, and sometimes 80% or more, of the width of the automobile. Therefore, when a large battery box 101 is mounted on the lower part of the vehicle, a larger load than before is input to the battery box 101 at the time of a collision. Therefore, it is preferable to have an energy absorbing structure to protect the battery itself.

The energy absorbing member 108 is preferably provided to absorb energy from the vehicle width direction, and is preferably provided along the outer side of the peripheral wall in the longitudinal direction of the vehicle body.

The lower cross member 701 may be joined with the energy absorbing member 108. As a result, when one side of the vehicle receives an impact, in addition to the energy absorbing member on the side receiving the impact, the energy absorbing member on the side opposite to the side receiving the impact can also contribute to absorption of the impact energy. .

[protective wall]
A protective wall may be provided under the battery tray.
1. Specifically, it is as follows.
A vehicle structure comprising a battery tray and a protective wall provided under the battery tray, wherein the battery tray and the protective wall are each made of fiber-reinforced plastic, and the protective wall is fastened to the battery tray at least one point. A vehicle structure that is fastened by a rod, and in which an insertion hole for fastening is formed integrally with a battery tray.
An example of a protective wall is shown at 1001 in FIG. A fastening rod is 1002 in FIG. 10, and an insertion hole is 1003 in FIG.

2. Insertion Hole It is preferable that an insertion base (1004 in FIG. 10) projecting from the battery tray toward the protective wall is provided, and the insertion hole is arranged inside the insertion base.
3. Shock Mitigation Material It is preferable to place a shock mitigation material (1005 in FIG. 10) between the battery tray and the protective wall. Further, it is more preferable that the shock absorbing material is a honeycomb structure. By providing such a shock absorbing material, the shock resistance from the lower part of the vehicle is improved.
4. Rectifier plate The protective wall is preferably made of fiber-reinforced plastic integrally provided with the rectifier plate, and the rectifier plate is preferably provided on the lower side of the protective wall. By providing the current plate, the air resistance is reduced and the running stability of the vehicle is improved.
5. Electromagnetic Wave Shielding Layer It is preferable to provide an electromagnetic wave shielding layer between the protective wall and the battery tray. More specifically, it is preferable to provide an electromagnetic wave shielding layer on the upper surface of the protective wall. In this case, it is preferable to arrange the shock absorbing material above the electromagnetic wave shielding layer.

6. Protective wall material 6.1
The protective wall may be fiber-reinforced plastic obtained by molding a sheet molding compound containing reinforcing fibers and a thermosetting resin.
6.2
The protective wall may be made of fiber-reinforced plastic obtained by molding a composite material containing reinforcing fiber and thermoplastic resin.
7. Thickness of Protective Wall It is preferably 1 mm or more, more preferably 3 mm or more, and even more preferably 5 mm or more.

[Manufacturing method of vehicle structure]
The vehicle structure manufacturing method of the present invention comprises:
A method for manufacturing a vehicle structure having a battery cover disposed under a vehicle body of a vehicle, a floor panel forming a lower portion of a vehicle interior, and a side sill, comprising:
At least 80% of the projected area S1 of the battery cover also serves as the floor panel,
The battery cover is made of fiber-reinforced plastic containing reinforcing fibers and resin,
gluing the battery cover to the side sill after pre-bonding the upper cross member to the side sill;
A method for manufacturing a vehicle structure.

The vehicle structure of the present invention can be used, for example, as a member that constitutes an electric vehicle.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application (Japanese Patent Application No. 2021-010466) filed on January 26, 2021, the contents of which are incorporated herein by reference.

101: Battery box 102: Battery cover 103: Battery 104: Temperature control system (cooling mechanism)
105: Battery tray 106: Reinforcing frame 107: Internal dividing wall formed by first inner wall and second inner wall 108: Energy absorbing member (member capable of absorbing energy)
201: top portion of internal dividing wall 205: peripheral wall 206: first internal wall 207: second internal wall 208: recess extending in vehicle width direction 301: second bottom surface portion 303: first bottom surface portion 304: metal cover 313 : Spatial region 402 surrounded by the first inner wall, second inner wall, and second bottom surface (or stud bolt base): Flange 407: Stud bolt base 408: Upper surface of stud bolt base 409: Stud bolt 411: Battery bracket 412: Insertion hole α: Angle between first bottom surface and first inner wall β: Angle between first bottom surface and second inner wall h1: Height from first bottom surface to flange h2: First Height h3 from the bottom surface to the top surface of the stud bolt base: Height from the first bottom surface to the top surface of the second bottom surface R501: Inner corner R502 in the boundary area between the first bottom surface and the peripheral wall: First bottom surface and peripheral wall outer corner R520: inner corner R521 in the boundary area between the first bottom surface and the first inner wall: outer corner R530 in the boundary area between the first bottom surface and the first inner wall: the first bottom Inner corner portion R531 in the boundary region between the part and the second inner wall: Outer corner portion in the boundary region between the first bottom face portion and the second inner wall 701: Lower cross member 702: Rib 703: When the lower cross member is inserted into the recess A space 802 between the lower cross member and the second bottom surface part: rib 1001: protective wall 1002: fastening rod 1003: insertion hole 1004: insertion base 1005: shock absorbing material t1: thickness t2 of stud bolt base 407: Thickness 1101 of the second bottom portion 301: Side sill 1102: Appearance of the battery cover being adhered to the side sill 1201: Upper cross member 1202: Joint region between the upper cross member and the battery cover 1301: Along the groove of the battery cover A space 1302 created by arranging a hat-shaped upper cross member that is convex upward: a joint area between the upper cross member and the battery cover.

Claims

A vehicle structure having a battery cover disposed under the vehicle body of the vehicle, a floor panel forming the lower part of the vehicle interior, and a side sill,
At least 80% of the projected area S1 of the battery cover also serves as the floor panel,
The vehicle structure body, wherein the battery cover is made of fiber-reinforced plastic containing reinforcing fibers and resin, and the battery cover is adhered to the side sill.
The vehicle structure according to claim 1, wherein the battery cover forms a groove in the vehicle width direction, and the upper cross member is inserted into the groove.
The vehicle structure according to claim 2, wherein a cross section of the upper cross member when viewed in the vehicle width direction has a hat shape that is downwardly convex, and the convex is inserted into the groove.
The vehicle structure according to any one of claims 2 and 3, wherein the upper cross member is joined to the side sill.
A groove is formed in the battery cover in the vehicle width direction, and an upper cross member is arranged along the groove. The vehicle structure according to claim 1, wherein:
The vehicle structure according to claim 5, wherein said upper cross member is joined to said side sill.
The vehicle structure according to any one of claims 1 to 6, wherein the battery cover is fiber reinforced plastic integrally molded using a sheet molding compound.
The vehicle structure according to any one of claims 1 to 7, wherein the battery cover is adhered to the side sill using a urethane-based adhesive.
The vehicle structure according to any one of claims 1 to 8, wherein 90% or more of the projected area S1 of the battery cover also serves as a floor panel forming the lower part of the vehicle compartment.
A method for manufacturing a vehicle structure having a battery cover disposed under a vehicle body of a vehicle, a floor panel forming a lower portion of a vehicle interior, and a side sill, comprising:
At least 80% of the projected area S1 of the battery cover also serves as the floor panel,
The battery cover is made of fiber-reinforced plastic containing reinforcing fibers and resin,
gluing the battery cover to the side sill after pre-bonding the upper cross member to the side sill;
A method for manufacturing a vehicle structure.