JP2023006072A - Support device for vehicle battery pack - Google Patents

Abstract

To improve the mountability of on-vehicle equipment while enhancing the protection performance at a side collision, of a vehicle battery pack, and to suppress the weight increase of a support device.SOLUTION: A support device 1 for a vehicle battery pack 4 includes a battery side bracket 5, frame side brackets 6, and patterned openings 9. The battery side bracket 5 includes opposing plates 51 each opposing respectively battery side surfaces 41 and accommodates the battery pack 4 therein. The frame side bracket 6 connects the battery side bracket 5 and a side rail 21. The patterned opening portion 9 is formed with a plurality of holes 95 in the opposing plate 51 of the battery side bracket 5, an on-vehicle device 10 is mounted on the battery side bracket 5 through the plurality of holes 95, and the plurality of holes 95 is arranged in a predetermined pattern. The opposing plate 51 is made of an extruded material including a cavity 57 inside, and the plurality of holes 95 are provided so as to pass through the opposing plate 51 from the cavity 57 outward in a vehicle width direction.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD This application relates to a support device for supporting a battery pack for a vehicle.

2. Description of the Related Art Conventionally, from the viewpoint of reducing the load on the environment, development of electric vehicles, such as electric vehicles and hybrid vehicles, which run by supplying electric power from a driving battery to a motor has progressed. In recent years, in the field of commercial vehicles such as trucks, electric vehicles have also been developed (see Patent Document 1, for example). In such electric commercial vehicles, application of general-purpose battery packs used in passenger cars is being studied from the viewpoint of cost reduction.

Japanese Patent Application Laid-Open No. 2016-113063

However, since battery packs for passenger cars are assumed to be mounted inside the vehicle body, there is a problem that the load-bearing strength of the housing itself is relatively low. On the other hand, in a commercial vehicle such as a truck, a high impact load may be applied to the battery pack placed below the ladder frame in the event of a side collision, so a support device that supports the battery pack is required to have a high load-bearing strength. be.

In general, in a vehicle equipped with a ladder frame, the space on the side of the ladder frame (outside in the vehicle width direction) between the wheel bases is used as a mounting space for various in-vehicle devices such as low-voltage batteries and side sensors. . On the other hand, when the battery pack is arranged below the ladder frame, the mounting space for the on-vehicle equipment is reduced by the battery pack, so there is a possibility that the mountability of the on-vehicle equipment may deteriorate.

The physical size of the battery pack is determined according to the maximum charging capacity required for the vehicle, the shape of the battery cells, etc., and should be designed to a size that protrudes outward from the ladder frame in the vehicle width direction. There is In this case, considering the side collision safety of the battery pack, in order to increase the rigidity of the support device, a relatively rigid metal such as steel is used, or the thickness of the member covering the battery pack is increased. need arises. As a result, the total weight of the supporting device increases, which may adversely affect the cruising range and load capacity of the electric truck.

This invention was invented in view of the above-mentioned problems, and while improving the protection performance of the vehicle battery pack in the event of a side collision, it improves the mountability of in-vehicle equipment and suppresses the weight increase of the support device. It is an object of the present invention to provide a supporting device for a vehicle battery pack that is capable of

The present invention has been made to solve at least part of the above problems, and can be implemented as the following aspects or application examples.
(1) A vehicle battery pack support device according to this application example is mounted below a side rail that constitutes a ladder frame of a vehicle and has a pair of battery side surfaces facing outward in the vehicle width direction. is located outside the side rail in the vehicle width direction, the battery-side bracket having a facing plate facing the side surface of the battery and housing the vehicle battery pack; A frame-side bracket connecting the battery-side bracket and the side rail and the opposing plate of the battery-side bracket are formed with a plurality of holes arranged in a predetermined pattern, and the in-vehicle device is connected to the vehicle-mounted device through the holes. a patterned opening to be mounted on the battery-side bracket, wherein the facing plate is made of an extruded material having a cavity therein, and the plurality of holes extend through the facing plate from the cavity toward the outside in the vehicle width direction. It is characterized in that it is provided so as to penetrate.

According to such a vehicle battery pack support device, an impact load that is input from the outside in the vehicle width direction at the time of a side collision is input to the vehicle-mounted device before being input to the battery-side bracket. is absorbed by the in-vehicle equipment. Since this reduces the impact load transmitted to the battery side bracket, the impact load transmitted to the vehicle battery pack through the battery side bracket is also reduced. Therefore, it is possible to enhance the protection performance of the vehicle battery pack in the event of a side collision. In addition, the facing plate of the battery-side bracket is provided with a patterned opening having a plurality of holes. As a result, a mounting space for the on-vehicle equipment can be secured and the mountability of the on-vehicle equipment can be improved. Furthermore, since the weight of the battery-side bracket is reduced by the amount of formation of the plurality of holes, an increase in the weight of the support device can be suppressed. In addition, since the opposing plate is made of an aluminum extruded material having a plurality of cavities inside, it is easier to reduce the weight and to form it as compared with the case of using a steel material. In addition, the hollow portion can be made to function as a crushable zone in the event of a side collision, and the initial collision energy can be reduced to prevent deformation and damage of the vehicle battery pack.

According to the present invention, it is possible to improve the mountability of in-vehicle equipment while improving the protection performance of the vehicle battery pack in the event of a side collision, and to suppress the weight increase of the support device.

1 is a perspective view of a supporting device for a vehicle battery pack according to an embodiment; FIG. FIG. 2 is an exploded perspective view for explaining the structure of the supporting device of FIG. 1; 2 is a perspective view of an end cross member of the support device of FIG. 1; FIG. 2A to 2C are side views illustrating patterns of holes formed in the patterned openings of the end cross member in the supporting device of FIG. 1; FIG. FIG. 2 is a left side view illustrating side rails and end cross members in the support device of FIG. 1; FIG. 3 is a cross-sectional view illustrating a method of mounting an in-vehicle device in the support device of FIG. 1; FIG. 3 is a cross-sectional view illustrating a method of mounting an in-vehicle device in the support device of FIG. 1; FIG. 3 is a perspective view showing a modification of the end cross member of FIG. 1; Figure 9 is a cross-sectional view of the end cross member shown in Figure 8;

Embodiments of the present application will be described with reference to the drawings. The following embodiments are merely examples, and are not intended to exclude various modifications and application of techniques not explicitly described in these embodiments. Each configuration of the following embodiments can be modified in various ways without departing from the spirit thereof. Also, they can be selected or combined as needed.

[1. Constitution]
[1-1. overall structure]
As shown in FIG. 1 , a vehicle battery pack support device 1 (hereinafter simply referred to as support device 1 ) according to the present embodiment is mounted on an electric truck (vehicle) 3 having a ladder frame 2 . The electric truck 3 is an electric vehicle (electric vehicle, hybrid vehicle) that runs by supplying electric power of a driving battery pack 4 (vehicle battery pack) to a motor (not shown).

Hereinafter, the front-rear direction of the electric truck 3 is also referred to as the vehicle length direction D1, and the left-right direction of the electric truck 3 is also referred to as the vehicle width direction D2. Moreover, the up-down direction perpendicular to both the front-rear direction and the left-right direction is also referred to as a vehicle height direction D3. In the drawings, the front is indicated by "FR", the rear is indicated by "RR", the left is indicated by "LH", the right is indicated by "RH", the upper is indicated by "UP", and the lower is indicated by "DW". indicated by . 1 shows the lower structure of the electric truck 3, and the upper structure (body) arranged above the ladder frame 2 is omitted.

The ladder frame 2 is a member forming the skeleton of the electric truck 3 and has high rigidity and strength. The ladder frame 2 includes a pair of side rails 21 extending in the vehicle length direction D1 and a plurality of cross members 22 extending in the vehicle width direction D2 and connecting the side rails 21 to each other.
The pair of side rails 21 are arranged apart from each other in the vehicle width direction D2. Each side rail 21 has a pair of plate-like flange portions extending inward in the vehicle width direction D2 from upper and lower edges of plate-like web portions along the vehicle length direction D1 and the vehicle height direction D3. It has a channel shape (U-shaped cross section).
The plurality of cross members 22 are spaced apart from each other in the vehicle length direction D1. Here, two cross members 22 are respectively arranged at two positions, namely a position overlapping the battery pack 4 in the vehicle height direction D3 and a position behind the battery pack 4, respectively.

The battery pack 4 is, for example, a general-purpose high-voltage battery pack used in passenger cars. In the electric truck 3 , the battery pack 4 is mounted below the pair of side rails 21 and protrudes further outward in the vehicle width direction D2 than the side rails 21 . Here, a box-shaped battery pack 4 whose dimension in the vehicle height direction D3 is smaller (thinner) than each dimension in the vehicle length direction D1 and the vehicle width direction D2 is exemplified. However, the shape of the battery pack 4 is not particularly limited.

The battery pack 4 has a pair of battery side surfaces 41 facing outward in the vehicle width direction D2. The pair of battery side surfaces 41 are located outside the pair of side rails 21 in the vehicle width direction D2. More specifically, the right battery side 41 is positioned to the right of the right side rail 21 and the left battery side 41 is positioned to the left of the left side rail 21 .

Since the battery side surface 41 of the battery pack 4 is arranged outside the side rails 21 in the vehicle width direction D2 as described above, the dimension in the vehicle width direction D2 is larger than the distance between the web portions of the side rails 21. Secured. Thereby, the capacity of the battery pack 4 is increased. Moreover, in order to ensure the cruising distance of the electric truck 3, the battery pack 4 is preferably arranged over a wide range of the wheelbase (the distance between the front wheel axle and the rear wheel axle). In a relatively small (relatively short wheelbase) electric truck 3, one battery pack 4 can be arranged over substantially the entire wheelbase. In this case, the front wheels are arranged close to the front of the battery pack 4 , and the rear wheels are arranged close to the rear of the battery pack 4 .

Note that the size of the electric truck 3 and the number of battery packs 4 are not limited to those illustrated in this embodiment. A plurality of battery packs 4 may be arranged side by side in the vehicle length direction D<b>1 on the relatively large electric truck 3 (having a relatively long wheelbase). Also in this case, by arranging a plurality of battery packs 4 over a wide range of the wheelbase, the overall capacity of the battery packs 4 can be increased, and the cruising distance can be ensured.

The support device 1 connects the battery pack 4 to the side rails 21 and supports the battery pack 4 . In other words, the battery pack 4 is supported by the side rails 21 via the support device 1 . In the present embodiment, the support device 1 is symmetrical (plane symmetric) with respect to a vertical plane passing through the center of the vehicle width direction D2 and extending in the vehicle length direction D1 as a plane of symmetry.

The support device 1 includes a battery side bracket 5 that houses the battery pack 4 and a frame side bracket 6 that connects the battery side bracket 5 and the side rails 21 . The battery-side bracket 5 is an outer wall body arranged on the outer periphery of the battery pack 4 and has a function of protecting the battery pack 4 from impact loads. On the other hand, the frame-side bracket 6 extends outward and downward in the vehicle width direction D2 from the side rail 21 and has a function of suspending the battery pack 4 accommodated in the battery-side bracket 5 from the side rail 21 .

The battery-side bracket 5 of this embodiment includes a pair of end cross members 7 arranged outside (left and right) of the battery pack 4 in the vehicle width direction D2, and arranged outside (front and rear) of the battery pack 4 in the vehicle length direction D1. It has a pair of main brackets 8 that are connected to each other. The battery side bracket 5 is arranged so as to surround the battery pack 4 on all four sides with the end cross member 7 and the main bracket 8 .

The pair of end cross members 7 are formed symmetrically with respect to a vertical plane extending in the vehicle length direction D1 through the center in the vehicle width direction D2. The pair of main brackets 8 are also formed symmetrically with respect to each other with respect to a vertical plane passing through the center in the vehicle length direction D1 and extending in the vehicle width direction D2 as a plane of symmetry. As shown in FIG. 2, both the end cross member 7 and the main bracket 8 of this embodiment are made of steel plate and have a channel shape.

The end cross member 7 includes a web portion 71 arranged along the side surface 41 of the battery, and a pair of web portions 71 projecting from the upper edge and the lower edge of the web portion 71 toward the battery pack 4 (inward in the vehicle width direction D2). and a flange portion 72 . In the end cross member 7 of the present embodiment, the web portion 71 is arranged apart from the battery side surface 41 (with a gap), so that a deformation allowance (shock load absorption allowance) at the time of collision is secured. .

The battery-side bracket 5 has a facing plate 51 (opposing portion) that faces the battery side surface 41 . The web portion 71 of the end cross member 7 forms a facing plate 51 facing the battery side surface 41 in the battery side bracket 5 . In this embodiment, the web portion 71 of the end cross member 7 is spaced apart from the battery side surface 41 as described above, so the facing plate 51 is not in contact with the battery side surface 41 . However, the opposing plate 51 (the web portion 71 of the end cross member 7 ) may be arranged in contact with the battery side surface 41 .

The main bracket 8 has a web portion 81 arranged along the front surface 42 or the rear surface 43 of the battery pack 4, and protrudes from the upper edge and lower edge of the web portion 81 toward the battery pack 4 (inward in the vehicle length direction D1). and a pair of flange portions 82 provided. The flange portion 82 of the main bracket 8 is overlaid on the battery pack 4 side (inner side in the vehicle height direction D3) than the flange portion 72 of the end cross member 7, and is attached to a fixture (not shown) or any joining means (welding, adhesion, etc.). is connected to the flange portion 72 of the end cross member 7 via the .

As shown in FIG. 1, the frame side bracket 6 is fixed to the portion where the upper flange portions 72 and 82 of the end cross member 7 and the main bracket 8 overlap. The frame side bracket 6 is also fixed to the web portion of the side rail 21 . Here, an example is shown in which two frame-side brackets 6 are provided on each side of the electric track 3 (outside of each side rail 21 in the vehicle width direction D2) (four in total).

[1-2. Configuration of main parts]
The facing plate 51 (web portion 71 ) of the battery-side bracket 5 is provided with patterned openings 9 . The pattern-shaped opening 9 is a portion in which a plurality of holes 95 arranged in a predetermined pattern are formed, and is a portion to which the vehicle-mounted device 10 is to be attached. Here, the "predetermined pattern" means a pattern including "an arrangement shape of the holes 95 formed by laying plane figures having at least one or more holes 95 without gaps". The "predetermined pattern" includes not only patterns containing periodic array shapes, but also patterns containing non-periodic array shapes.

In any case, various vehicle-mounted devices 10 can be mounted on the battery side bracket 5 through the plurality of holes 95 provided in the patterned opening 9 . The shape of the hole 95 can be arbitrarily set, and may be circular or rectangular, for example. Further, the front edge and the rear edge of the facing plate 51 of the present embodiment can be formed in a half-moon shape notched in a side view, for example, in order to reduce the weight of the battery side bracket 5 . In this case, the patterned openings 9 are arranged within a range sandwiched between the cutouts in the front and rear.

As shown in FIG. 3, the opposing plate 51 (web portion 71) is formed in an extruded shape having a cavity 57 inside. This cavity 57 is formed so as to cover the entire outer end portion of the battery-side bracket 5 (end cross member 7) in the vehicle width direction D2, and functions as a crushable zone in the event of a side collision. The cross-sectional shape of the peripheral wall surrounding the cavity 57 is preferably a closed cross-sectional shape, more preferably a polygonal shape (for example, rectangular or trapezoidal). The extending direction (extrusion direction) of the cavity 57 is the direction along the vehicle length direction D1. The number of cavities 57 may be one or plural. Also, the composition of the opposing plate 51 does not matter, and for example, aluminum alloys, magnesium alloys, steel materials, ceramics, synthetic resins, etc. can be used. The opposing plate 51 of the present embodiment is made of an extruded aluminum alloy material (aluminum extruded material) which is advantageous in formability, weight, and cost.

The plurality of holes 95 described above are provided so as to penetrate the opposing plate 51 from the cavity 57 outward in the vehicle width direction D2. In other words, the plurality of holes 95 are formed in the peripheral wall that surrounds the cavity 57 and that is located outside in the vehicle width direction D2. Further, the vehicle-mounted device 10 attached to the patterned opening 9 via the plurality of holes 95 is arranged outside the cavity 57 in the vehicle width direction D2. Therefore, a cavity 57 is interposed between the vehicle-mounted device 10 and the battery pack 4 . As a result, even if an external force acts on the in-vehicle device 10 at the time of a side collision, the impact is buffered and absorbed by the deformation of the peripheral wall surrounding the cavity 57, and the protection performance of the battery pack 4 is improved.

Inside the cavity 57, a plate 58 to which fasteners (for example, welding bolts 91, welding nuts 94, etc.) for attaching the in-vehicle device 10 are fixed may be inserted. A plurality of plate holes 59 corresponding to the plurality of holes 95 are bored in the plate 58 , and weld bolts 91 and weld nuts 94 are fixed inside the respective plate holes 59 . The horizontal pitch of the plate holes 59 is set to be the same as the horizontal pitch of the holes 95 . By inserting the plate 58 into the cavity 57 so that the centers of the plate holes 59 and 95 are aligned, it is possible to attach nuts, bolts, etc. that are screwed with the weld bolts 91 and weld nuts 94 fixed to the plate 58. easier.

Layouts of the holes 95 provided in the patterned openings 9 are illustrated in FIGS. Axis C1 shown in these drawings is the center line of opposing plate 51 (web portion 71) extending in vehicle height direction D3 in a side view of battery side bracket 5 (end cross member 7), and axis C2 is the center line of the opposing plate 51 (web portion 71) extending in the vehicle length direction D1.

4A and 4B show a plurality of battery-side brackets 5 (end cross members 7) arranged in a planar grid pattern (for example, square grid pattern, rectangular grid pattern, orthorhombic grid pattern, etc.) in a side view. The holes 95 are arranged symmetrically in the horizontal direction and symmetrical in the vertical direction. The pitch of the holes 95 in the vertical direction is, for example, set to be the same as the pitch in the horizontal direction or an integral multiple thereof. In FIG. 4A, a square grid pattern (or rectangular grid pattern) arranged in 6 rows in the horizontal direction and 4 rows in the vertical direction is arranged at a predetermined interval in the vehicle length direction D1 (for example, with a pitch in the horizontal direction). are arranged with the same or integral multiple dimensions). In FIG. 4B, the middle rows (second and third rows from the top) are deleted from the pattern of holes 95 of FIG. 4A, leaving only the top and bottom rows. These layouts are symmetrical about the axis C1 and vertically symmetrical about the axis C2.

FIG. 4C shows a side view of the battery-side bracket 5 (end cross member 7), in which a plurality of holes 95 arranged in an orthorhombic grid are arranged symmetrically about the axis C1. Here, four rows in which holes 95 are arranged in the horizontal direction at predetermined intervals are arranged in the vertical direction. The horizontal positions of the holes 95 are set so as not to coincide with the horizontal positions of the holes 95 included in vertically adjacent rows. For example, the arrangement pattern of the holes 95 is staggered. Also, the pitch in the vertical direction of the holes 95 is set equal to the pitch in the horizontal direction, for example, and the pitch in the diagonal direction is set to a constant value.

In FIG. 5, the arrangement of the holes 95 provided in the patterned opening 9 corresponds to the hole pattern 24 of the side rail 21. As shown in FIG. The web surface 23 of the side rail 21 is formed with a predetermined hole pattern 24 (for example, a planar lattice hole pattern 24). The arrangement pitch (vertical and horizontal pitches) of the holes 95 is set to be the same as the arrangement pitch of the hole pattern 24 or an integral multiple thereof. The layout of the holes 95 of the patterned opening 9 may be completely matched with the hole pattern 24 of the side rail 21, or may be partially matched. Further, the arrangement of the plurality of holes 95 may be set so as to correspond to the hole pattern 24 formed in the portion of the web surface 23 of the side rail 21 located directly above the battery pack 4 . For example, a plurality of holes 95 may be formed in the patterned opening 9 in a layout in which the hole pattern 24 of the side rail 21 is vertically moved downward as it is in the side view of the electric truck 3 . The specific positions and number of holes 95 are not limited to those illustrated above.

As shown in FIGS. 6 and 7, the patterned openings 9 may include weld bolts 91 and weld nuts 94 for attaching the in-vehicle device 10 to the battery side bracket 5 (end cross member 7). 6 shows the plate 58 with weld bolts 91 fixed thereto, and FIG. 7 shows the plate 58 with weld nuts 94 fixed thereto.
As shown in FIG. 6, the weld bolt 91 has a head 92 welded to the plate 58 and a threaded portion 93 projecting outward from the head 92 . Specifically, the weld bolt 91 is welded and fixed to the plate 58 with the screw portion 93 inserted into the plate hole 59 from the inside in the vehicle width direction D2. Further, the plate 58 is attached inside the cavity 57 so that the threaded portion 93 is inserted into the hole 95 from the inside in the vehicle width direction D2.
The threaded portion 93 of the weld bolt 91 is inserted through a through hole (not shown) formed in the in-vehicle device 10 (or its bracket or the like) and then fastened to the nut 14 . Thus, the in-vehicle device 10 is attached to the patterned opening 9 .

A weld nut 94 is welded to the plate 58, as shown in FIG. Specifically, a weld nut 94 is secured to the plate 58 while being coaxially positioned with the plate hole 59 . Also, this plate 58 is inserted inside the cavity 57 so that the centers of the plate holes 59 and holes 95 are aligned.
The weld nut 94 is fastened to the bolt 15 inserted from the outside in the vehicle width direction D2 through a through hole (not shown) formed in the vehicle-mounted device 10 (or its bracket or the like). As a result, the in-vehicle device 10 is attached to the patterned opening 9 including the weld nut 94 . The bolt 15 fastened to the weld nut 94 is set such that the length dimension L of the threaded portion is sufficiently shorter than the inner dimension (gap) S of the cavity 57 (L<S).

The method of mounting the in-vehicle device 10 in the pattern-shaped opening 9 is not limited to the method using the welding bolt 91 and the welding nut 94, and various known methods can be applied. For example, the in-vehicle device 10 may be mounted in the patterned opening 9 by ordinary bolts and nuts (not shown) that are not welded to the plate 58 . Alternatively, some in-vehicle devices 10 may be directly welded to the patterned openings 9 .

As shown in FIG. 1, an in-vehicle device 10 of the present embodiment includes a housing 12 provided with a charging port 11 for supplying power to the battery pack 4 from the outside, and a sensor for detecting an object outside in the vehicle width direction D2. 13. Here, an example in which the housing 12 is mounted in the left patterned opening 9 and the sensor 13 is mounted in the right patterned opening 9 is shown. Both the housing 12 and the sensor 13 are provided so as to protrude outward in the vehicle width direction D2 from the battery side bracket 5 .

The housing 12 is also called a CIB (Charge Inlet Box), and is provided at a predetermined position where the charging port 11 can be accessed from the outside of the electric truck 3 . The charging port 11 in the housing 12 is arranged facing outward in the vehicle width direction D2.
The sensor 13 is, for example, a radar or a camera applied to a technology (so-called blind spot assist) that detects an object existing in the blind spot of the electric truck 3 and informs the driver of it. The sensor 13 is provided at a predetermined position where the blind spot is the detection range.

[2. Action and effect]
(1) According to the support device 1 of the present embodiment, since the battery-side bracket 5 is provided with the pattern-shaped opening 9 for mounting the in-vehicle device 10, an impact load that is input from the outside in the vehicle width direction D2 at the time of a side collision is input to the in-vehicle device 10 before being input to the battery side bracket 5 . Thereby, the initial input of the impact load can be absorbed by the in-vehicle device 10 before it is absorbed by the battery side bracket 5 . As a result, since the impact load transmitted to the battery side bracket 5 can be reduced, the impact load transmitted to the battery pack 4 through the battery side bracket 5 can also be reduced. Therefore, it is possible to improve the protection performance of the battery pack 4 in the event of a side collision.

In addition, in the electric truck 3, the battery pack 4 is mounted below the side rails 21, and the battery side surface 41 is positioned outside the side rails 21 in the vehicle width direction D2, so that the capacity of the battery pack 4 can be increased. On the other hand, since the battery pack 4 protrudes further outward in the vehicle width direction D2 than the side rails 21, the mountability of the in-vehicle device 10 on the side rails 21 may deteriorate. On the other hand, the opposing plate 51 of the battery-side bracket 5 is provided with a patterned opening 9 having a plurality of holes 95 formed therein. As a result, a mounting space for the vehicle-mounted device 10 can be secured outside the battery-side bracket 5, and the mountability of the vehicle-mounted device can be improved. Further, since the weight of the battery side bracket 5 is reduced by the amount of the formation of the plurality of holes 95, an increase in the weight of the support device 1 can be suppressed.

In addition, in the support device 1 of the present embodiment, since the facing plate 51 is made of the aluminum extrusion material having the cavity 57 inside, it is easier to reduce the weight than when steel material is used, for example, and in terms of molding and cost. But it is advantageous. In addition, by providing a plurality of holes 95 so as to pass through the facing plate 51 from the cavity 57 outward in the vehicle width direction D2, the on-vehicle device 10 can be installed at a location outside the cavity 57 in the vehicle width direction D2. can be set to As a result, the cavity 57 can function as a crushable zone in the event of a side collision, reducing initial collision energy and preventing deformation and damage to the battery pack 4 . Furthermore, as shown in FIG. 7, when using a bolt 15 whose length L of the threaded portion is sufficiently smaller than the inner dimension S of the cavity 57, the length of the peripheral wall surrounding the cavity 57 in the vehicle width direction D2 is increased. interference with the bolt 15 is prevented, and the bolt 15 and the battery pack 4 are less likely to come into contact with each other. Therefore, according to the support device 1 of the present embodiment, it is possible to improve the mountability of the in-vehicle device 10 while improving the protection performance of the battery pack 4 in the event of a side collision, and to suppress the weight increase of the support device 1 .

[3. others]
The configuration of the battery-side bracket 5 described above is an example. The battery-side bracket 5 may have at least a shape that has a facing plate 51 facing the battery side surface 41 and accommodates the battery pack 4, and may be formed of members other than the end cross member 7 and the main bracket 8 described above. good.
The configuration, arrangement and number of frame-side brackets 6 are also not limited to the above examples. The same applies to the configuration, arrangement and number of cavities 57 and plates 58 .

FIG. 8 is a perspective view showing a modification of the battery side bracket 5 (end cross member 7), and FIG. 9 is a sectional view thereof. The facing plate 51 (web portion 71) shown in FIGS. 8 and 9 is made of an extruded material having a single cavity 57 therein. The plurality of holes 95 are formed in the outer peripheral wall in the vehicle width direction D<b>2 of the peripheral walls surrounding the cavity 57 . Also, the plate 58 inserted into the cavity 57 is provided with a plurality of plate holes 59 arranged in the same layout as the plurality of holes 95 . Thus, even if the number of the cavity 57 and the plate 58 is one, the same actions and effects as those of the above embodiment can be obtained.

The specific structure of the patterned openings 9 is not limited to the above examples. The patterned openings 9 may include both the weld bolts 91 and the weld nuts 94 or may include structures other than the weld bolts 91 and the weld nuts 94 .
As the in-vehicle device 10 mounted in the pattern-shaped opening 9, various devices mounted on the electric truck 3 can be employed without being limited to the housing 12 and the sensor 13 described above. For example, the in-vehicle device 10 may include a low-voltage battery (not shown) for auxiliary equipment of the electric truck 3 . Even if the vehicle-mounted device 10 includes such a low-voltage battery, the support device 1 and the electric truck 3 can improve the protection performance of the battery pack 4 in the event of a side collision, as in the above embodiment. 10 can be secured.

Specific examples of the other in-vehicle device 10 include a mounting device mounted on the electric truck 3 and an accompanying device for the mounting device. The mounting equipment includes refrigeration equipment, power generation equipment, lighting equipment, water supply equipment, shredder equipment, waste storage equipment, crane equipment, and the like. The accompanying devices include motors, compressors, pumps, wiring materials, piping materials, tool boxes, and the like. By making it possible to mount such a bodywork and auxiliary equipment on the battery-side bracket 5, for example, the same bodywork and auxiliary equipment can be mounted in substantially the same positions as in existing vehicles in which the battery pack 4 is not mounted. It is possible to further improve usability and convenience.

Further, in the existing vehicle, a bodywork device and ancillary devices are attached to the side rail 21 through relatively long brackets. On the other hand, in this embodiment, the mounting device and the auxiliary device are attached to the facing plate 51 (the web portion 71 of the end cross member 7) of the battery side bracket 5 located outside the side rail 21 in the vehicle width direction D2. Therefore, shorter brackets than conventional brackets are sufficient. Therefore, the bracket can be made smaller, the vibration resistance can be improved, and the cost can be reduced.
The application target of the support device 1 is not limited to the electric truck 3 described above. Support device 1 is applicable to various vehicles having ladder frame 2 .

1 Support device (battery pack support device)
2 Ladder frame 3 Electric truck (vehicle)
4 battery pack (vehicle battery pack)
5 Battery side bracket 6 Frame side bracket 7 End cross member 8 Main bracket 9 Pattern-shaped opening 10 In-vehicle device 11 Charging port 12 Housing 13 Sensor 14 Nut 15 Bolt 21 Side rail 22 Cross member 23 Web surface 24 Hole pattern 41 Battery side 42 front surface 43 rear surface 51 opposing plate 57 cavity 58 plate 59 plate hole 71 web portion 72 flange portion 81 web portion 82 flange portion 91 weld bolt 92 head 93 screw portion 94 weld nut 95 hole

Claims (1)

A battery pack for a vehicle, which is mounted below a side rail that constitutes a ladder frame of a vehicle, has a pair of battery side surfaces facing outward in the vehicle width direction, and the battery side surface is positioned outside the side rail in the vehicle width direction. a support device for
a battery-side bracket having a facing plate facing the side surface of the battery and housing the vehicle battery pack;
a frame-side bracket that connects the battery-side bracket and the side rail;
In the opposing plate of the battery-side bracket, a pattern-shaped opening formed with a plurality of holes through which an in-vehicle device is mounted on the battery-side bracket, and in which the plurality of holes are arranged in a predetermined pattern. and including
The opposing plate is made of an extruded material having a cavity inside,
A supporting device for a battery pack for a vehicle, wherein the plurality of holes are provided so as to pass through the facing plate from the cavity toward the outside in the vehicle width direction.

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