JP2013112166A - Installation structure of battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation structure of a battery pack of a hybrid vehicle and an electric automobile for arranging a battery between side members.SOLUTION: The installation structure of the battery pack includes a first bracket 3 of applying bends of a plurality of upward projection shapes and a second bracket 8 of applying bends of a plurality of upward recessed shapes to positions corresponding to the bends of the first bracket 3, a plurality of closed cross sections are formed by joining a part applied with the bends of the projection shapes of the first bracket 3 and a part applied with the bend of the second bracket 8 in the vertical direction, and an insertion hole of a battery pack installing bolt 5 is formed between the plurality of closed cross sections.

Description

The present invention relates to a battery pack mounting structure used for an electric vehicle and a hybrid vehicle, and more particularly to a battery pack mounting structure that has a high rigidity and can prevent loosening of mounting bolts due to road surface interference or the like.

Battery packs used for electric vehicles and hybrid vehicles are usually attached to side members and cross members. For example, in Patent Document 1, in order to attach a battery pack to a side member, a bracket is joined to a mounting portion of a cross member so as to prevent a downward U-shaped bracket opening from being opened. .

However, the closed section (closed space) formed by the flat plate and the bracket has a small cross-sectional area, and since the head of the mounting bolt is located on the closed section, it is necessary to provide an opening in the bracket. There is a problem. Further, when the lower surface is a flat plate, the end of the mounting bolt inevitably protrudes downward from the flat plate, and therefore the mounting bolt may be loosened or the mounting portion may be damaged due to road surface interference. Furthermore, if the mounting bolt protrudes downward, the under cover cannot be attached to the flat plate, so that it is necessary to provide a dedicated bracket.

Japanese Patent No. 4386131

The present invention was created in view of the above circumstances, and a bracket for arranging a battery pack of an electric vehicle or a hybrid vehicle between side members can be formed with a highly rigid structure and road surface interference. It is an object of the present invention to provide a battery pack mounting structure that can prevent loosening of mounting bolts due to, for example, and can directly mount an under cover.

In order to achieve the above object, the present invention provides a battery pack mounting structure for a hybrid vehicle or an electric vehicle in which a battery is disposed between side members. The mounting structure of the battery pack includes a first bracket that is bent in a plurality of upward convex shapes, and a second bracket that is bent in a plurality of upward concave shapes at positions corresponding to the bending processing of the first brackets. A plurality of closed cross sections are formed by joining the bent portion of the convex shape of the first bracket and the bent portion of the second bracket in the vertical direction. An insertion hole for the battery pack mounting bolt is formed between the closed cross sections.

According to the battery pack mounting structure of the present invention, the first bracket has a plurality of portions bent into an upward convex shape (that is, a concave shape having an opening downward), and the second bracket has an upward concave shape (that is, downward) There are a plurality of portions bent into a convex shape. The bent portion of the first bracket and the bent portion of the second bracket are positioned and joined so that their openings face each other. By this joining, a plurality of closed cross sections are formed at the bent portions of the first bracket and the second bracket.

Therefore, in the battery pack mounting structure, since the flat plate is not joined to the lower surface of the first bracket as in the prior art, the upwardly concave second bracket is joined as described above, so that a plurality of large closed cross sections are provided. As a result, the rigidity of the entire mounting structure is increased. Further, since the mounting bolt insertion hole is provided in the space formed between the closed cross sections (that is, the downward concave space), a structure in which the lower end (bolt head) of the mounting bolt does not protrude is formed. It is possible to prevent the mounting bolts from loosening due to stone hitting or road surface interference. Further, since the lower end of the mounting bolt does not protrude, the bolt can be directly fastened to the second bracket when the under cover is attached, so that it is not necessary to prepare a bracket for attaching the under cover separately, and the number of parts can be reduced.

In other words, according to the present invention, the bracket for arranging the battery pack of the electric vehicle or the hybrid vehicle between the side members can be formed with a highly rigid structure. In addition, with this battery pack mounting structure, loosening of mounting bolts due to stone contact, road surface interference, etc. can be prevented without additional protection, etc., and the under cover can be directly mounted without providing a dedicated bracket. An increase in the number of points can be suppressed, and as a result, an increase in weight and an increase in cost can be suppressed.

The perspective view of an example of the battery pack 1 is shown. The bottom view of the battery pack 1 of FIG. 1 is shown. It is sectional drawing which shows the attachment structure of the conventional battery pack. It is sectional drawing which shows one Embodiment of the attachment structure of the battery pack of this invention.

Next, a battery pack mounting structure according to an embodiment of the present invention will be described in detail with reference to the drawings. Prior to the description of the battery pack mounting structure, an outline of the battery pack and the conventional battery pack mounting structure will be described.

≪Configuration of battery pack and conventional battery pack mounting structure≫
FIG. 1 shows a perspective view of an example of the battery pack 1, and FIG. 2 is a bottom view of the battery pack 1 of FIG. The battery pack 1 is a so-called battery unit that includes a battery and its associated device, and its outer shell (container body) is usually made of resin or metal. The battery pack 1 is disposed between side members of a vehicle (not illustrated, but the arrangement location image is shown by the dashed lines A and B in FIG. 1). Actually, the battery pack 1 is attached to a cross member 2 provided vertically between the side members on the bottom surface.

3 is a cross-sectional view of a portion surrounded by a dotted line A in FIG. 2 as viewed from the vehicle width direction (the lower side of the drawing in FIG. 2).
Reference numeral 1a denotes an outer shell 1a of the battery pack 1, and the battery pack 1 is provided with a mounting plate 1b at the bottom of the outer shell 1a. The battery pack 1 is attached to the cross member 2 by the attachment plate 1b. The cross member 2 is generally composed of a bracket 3 and a flat plate 4. The bracket 3 is bent at a plurality of locations. Referring to the left half of FIG. 3, round portions 3a, 3b, 3c, and 3d having substantially right angles are formed by bending, thereby forming an upward convex bent portion 3e. Similarly, the right side of FIG. 3 has an upward convex bent portion 3f. The attachment plate 1b of the battery pack 1 is joined by bending portions 3e and 3f. Further, the flat plate 4 is joined to the flat portions 3g, 3h, etc. of the bracket 3.

The bracket 3 and the mounting plate 1b are joined together, and the bracket 3 and the flat plate 4 are joined with the outer shell 1a, the mounting plate 1b, the bracket 3 and the flat plate 4 being sequentially stacked in the vertical direction. This is done by fastening 6. The mounting bolts 5 are respectively fastened with nuts 6 through the holes 1c of the outer shell 1a and the mounting plate 1b, the holes 3i of the bracket 3 and the holes 4 of the flat plate, which are provided at positions where they are viewed in the vertical direction. . A bolt head (bolt head) 5 a is the lower end of the mounting bolt 5, and the mounting bolt 5 is fastened with a nut 6 inside the outer shell 1 a. A sleeve-shaped guide member 7 extending in the vertical direction is provided in the gap between the bracket 3 and the flat plate 4, and the legs of the mounting bolts 5 penetrate the inside of the guide member 7. This increases the vertical strength during fastening.

In the case of such a conventional battery pack mounting structure, except for the guide member 7, the rigidity is merely increased around the bent bracket 3, and there is a problem that the strength of the entire mounting structure is small. . Further, in this mounting structure, since the bottom surface is the flat plate 4, the bolt head 5 a protrudes as the lowermost end, and whenever there is road surface interference or a stone hit, an impact is directly applied to the bolt head 5 a, so And the nut 6 may be loosened. Further, when the bolt head 5a protrudes, the bolt head 5a becomes an obstacle even if an under cover is further attached under the flat plate 5. Therefore, it is necessary to prepare a separate bracket and attach the under cover through the bracket. There is also a problem.

<< Embodiment of Battery Pack Mounting Structure of the Present Invention >>
Next, a specific configuration example of the battery pack mounting structure of the present invention will be described in comparison with the conventional battery pack mounting structure. In the description of the battery pack mounting structure, the same members as those shown in FIGS. 1 to 3 are given the same reference numerals. In addition, since the battery pack 1 to be mounted in the battery pack mounting structure is common in the past, the description in FIGS. 1 to 2 can be generally applied to the battery pack mounting structure. Therefore, the description is omitted here, and the battery pack mounting structure of FIG. 4 that can be compared with the battery pack mounting structure of FIG. 3 will be described.

4 is a cross-sectional view of the portion enclosed by the dotted line A in FIG. 2 as viewed from the vehicle width direction (the lower side of the drawing in FIG. 2), like FIG.
The battery pack 1 is attached to the cross member 2 by the attachment plate 1b. The cross member 2 is generally composed of a first bracket 3 and a second bracket 8. The first bracket 3 is bent at a plurality of locations. Referring to the left half of FIG. 4, rounded portions 3a, 3b, 3c, and 3d having substantially right angles are formed by bending, thereby forming an upward convex bent portion 3e. Similarly, the right side of FIG. 4 has an upward convex bent portion 3f. The attachment plate 1b of the battery pack 1 is joined by bending portions 3e and 3f.

Further, the second bracket 8 is bent at a plurality of locations like the first bracket 3 unlike the flat plate 4 in FIG. Referring to the left half of FIG. 4, round portions 8a, 8b, 8c, and 8d having substantially right angles are formed by bending, thereby forming an upward concave bent portion 8e. Similarly, the right side of FIG. 4 has an upward concave bent portion 8f. The flat portions 3g, 3h, etc. of the first bracket 3 are joined to the corresponding flat portions 8a, 8h, etc. of the second bracket 8, respectively. Further, the upward convex bent portion 3e of the first bracket 3 is positioned at the position of the upward concave shape 8e of the second bracket 8. The two bent portions 3e and 8e are positioned at positions where the respective openings face each other, and both the openings are combined to have one closed cross section (closed space).

In joining the first bracket 3 and the mounting plate 1b, and joining the first bracket 3 and the second bracket 8, the outer shell 1a, the mounting plate 1b, the first bracket 3 and the second bracket 4 are stacked in order in the vertical direction. In this state, the mounting bolt 5 and the nut 6 are fastened. The mounting bolts 5 are nuts that pass through the holes 1c of the outer shell 1a and the mounting plate 1b, the holes 3i of the first bracket 3, and the holes 8i of the second bracket 8, which are provided at positions that are sequentially viewed in the vertical direction. 6 is fastened. The bolt 5 (bolt head) 5a is the lower end of the mounting bolt 5 and is fastened with a nut 6 inside the outer shell 1a. A sleeve-shaped guide member 7 extending in the vertical direction is provided in the gap between the first bracket 3 and the second bracket 8, and the legs of the mounting bolt 5 penetrate the inside of the guide member 7 as shown in FIG. It is the same.

When such an attachment structure is adopted, the plurality of closed cross sections formed by bending the first bracket 3 and the second bracket 8 significantly increase the rigidity and increase the strength as compared with the attachment structure of FIG. As is clear from FIG. 4, the bolt head 5 a of the mounting bolt 5 is disposed on the inner side (above the dotted line C) of the flat portions 8 e and 8 f which are the lowermost surfaces of the second bracket 8. Therefore, since the impact is not directly applied to the bolt head 5a, it is possible to prevent the loosening of the bolt due to road surface interference or stone contact, which has been a problem in the past.

Further, consider a case where an under cover (not shown) is attached to the second bracket 8. In the conventional battery pack mounting structure shown in FIG. 3, since the bolt head 5a protrudes downward, the under cover cannot be directly joined to the flat plate 4, and a separate bracket is required. In the illustrated battery pack mounting structure, since the bolt head 5a is disposed above the flat portions 8e and 8f of the second bracket 8, the under cover can be mounted at the position of the dotted line C, and a separate bracket is prepared. Without under cover can be attached directly.

The embodiment and the concept of the battery pack mounting structure of the present invention have been described above, but the present invention is not limited to this, and does not depart from the spirit and teaching described in the claims and the description. Those skilled in the art will understand that other variations and modifications can be obtained within the scope.

1 battery pack 2 cross member 3 first bracket 4 flat plate 5 mounting bolt 6 nut 7 guide member 8 second bracket 9 bolt

Claims (1)

In the mounting structure of a battery pack of a hybrid vehicle or an electric vehicle in which a battery is disposed between side members,
A first bracket that is bent in a plurality of upwardly convex shapes;
A second bracket that is bent in a plurality of upward concave shapes at a position corresponding to the bending of the first bracket;
A plurality of closed cross-sections are formed by joining the bent portion of the convex shape of the first bracket and the bent portion of the second bracket in the vertical direction, and between the closed cross-sections. The battery pack mounting structure is characterized in that an insertion hole for a battery pack mounting bolt is formed in the battery pack mounting hole.