Battery mounting structure

Abstract

To obtain a battery mounting structure which can achieve collision performance and NV performance of a vehicle.SOLUTION: A battery 16 is coupled to a body 12 by a bracket 46 including at least two members having different rigidities (a high rigid bracket 48 and a lower rigid bracket 50) to achieve collision performance and NV performance of a vehicle 12.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a battery mounting structure. [Background technology]

[0002] Patent Document 1 below discloses technology related to a battery mounting structure for an electric vehicle. In this prior art, a battery case is formed from a resin containing glass fiber, a metal support member is fixed to the bottom of the battery case, and a metal frame is embedded in the wall of the battery case. The battery case is then fixed to a vehicle body member by a metal impact-resistant member.

[0003] In this way, in the above-mentioned prior art, the rigidity of a battery case made of resin can be improved by using metal components in some parts, thereby making it possible to reduce the weight of the battery case and improve the collision resistance of the battery. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-36901 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above prior art, the battery case is connected to a vehicle body member (body side) by a metal impact-resistant member, which allows for improved mounting rigidity of the battery case. By improving the mounting rigidity in this way, it is possible to improve the vehicle's NV performance (such as reducing noise while driving). However, if the impact-resistant member breaks during a vehicle collision, there is a possibility that the battery case will fall off the body.

[0006] Therefore, an object of the present invention is to provide a battery mounting structure that can achieve both the collision performance and NV performance of a vehicle. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the battery mounting structure of the first aspect of the present invention is configured to include a bracket including at least two members having different rigidities, and a battery that is connected to the body via the bracket and mounted on the lower side of a floor panel that forms the floor portion of the body.

[0008] The battery mounting structure of the first aspect includes a bracket and a battery. The bracket includes at least two members with different rigidities, and the battery is connected to the body (vehicle) via the bracket, and the battery is mounted on the lower side of the floor panel.

[0009] In this embodiment, the two components constituting the bracket have different rigidities. Therefore, for convenience, the one of the two components having the relatively higher rigidity will be referred to as the high-rigidity bracket, and the other having the relatively lower rigidity will be referred to as the low-rigidity bracket. By connecting the battery to the body using the bracket, including the high-rigidity bracket, the mounting rigidity of the battery is improved, vibration of the battery itself is suppressed, and the NV performance of the vehicle can be improved.

[0010] On the other hand, in this aspect, since the bracket is composed of at least two members, even if one member breaks, the other member does not break. For example, if the high-rigidity bracket breaks due to a vehicle collision, the low-rigidity bracket is spared from breakage, allowing the battery to be supported by the low-rigidity bracket. This makes it possible to prevent the battery from falling off the body in the event of a vehicle collision.

[0011] In this manner, in the event of a vehicle collision, the low-rigidity bracket can support the battery, and the high-rigidity bracket can bear the collision load until it breaks. In other words, in this embodiment, the high-rigidity bracket can absorb the impact (EA) of a high load, and the high-rigidity bracket can maximize its function as an impact absorbing member of a high load.

[0012] A second aspect of the battery mounting structure of the present invention is a battery mounting structure of the first aspect of the present invention, wherein the high-rigidity bracket having the higher rigidity of the two components and the low-rigidity bracket having the lower rigidity of the two components are configured to overlap when the vehicle is viewed from above.

[0013] In the battery mounting structure of the second aspect, the high-rigidity bracket and the low-rigidity bracket are configured to overlap in a plan view of the vehicle. This allows the bracket to be made more compact in a plan view of the vehicle than when, for example, a high-rigidity bracket is provided on the outer side of the vehicle width direction and a low-rigidity bracket is provided on the inner side of the vehicle width direction. This makes it possible to avoid interference with other components disposed below the floor panel.

[0014] A battery mounting structure of a third aspect according to the present invention is the battery mounting structure of the second aspect according to the present invention, wherein the low-rigidity bracket is arranged above the high-rigidity bracket in the vehicle vertical direction.

[0015] In the third aspect of the battery mounting structure, a low-rigidity bracket is provided above the high-rigidity bracket in the vertical direction of the vehicle, so that even if the high-rigidity bracket breaks, the broken high-rigidity bracket will not fall onto the low-rigidity bracket.

[0016] A fourth aspect of the battery mounting structure of the present invention is a battery mounting structure of the second or third aspect of the present invention, in which the low-rigidity bracket is formed so that the line length along the distance between the battery and the body is longer than that of the high-rigidity bracket.

[0017] In the battery mounting structure of the fourth aspect, the low-rigidity bracket is formed so that its wire length along the distance between the battery and the body is longer than that of the high-rigidity bracket. In other words, even if the two components constituting the bracket are made of the same material and have the same plate thickness, their rigidity varies depending on their wire length, so the one with the longer wire length is the low-rigidity bracket and the one with the shorter wire length is the high-rigidity bracket. In this aspect, after the high-rigidity bracket breaks, the battery can be supported by the low-rigidity bracket with the longer wire length.

[0018] For example, when a collision load (side impact load) is input to the side of the vehicle due to a side collision of the vehicle (hereinafter referred to as a "vehicle side impact"), a difference in relative movement occurs between the battery and the body. This causes a pulling force to act on the bracket connecting the battery to the body, but in this aspect, the low-rigidity bracket has a longer wire length than the high-rigidity bracket, so even if the high-rigidity bracket breaks, the low-rigidity bracket is spared from breakage, allowing the low-rigidity bracket to support the battery. As a result, this aspect makes it possible to prevent the battery from falling due to the input of the collision load.

[0019] A fifth aspect of the battery mounting structure of the present invention is a battery mounting structure of any one of the second to fourth aspects of the present invention, wherein the high-rigidity bracket is formed flat, and at least a portion of the low-rigidity bracket is formed unevenly along the fore-and-aft direction of the vehicle.

[0020] In the battery mounting structure of the fifth aspect, the high-rigidity bracket is formed in a flat shape. Therefore, a collision load input to the high-rigidity bracket is transmitted along the surface of the high-rigidity bracket. Therefore, in this aspect, a shear force acts on the high-rigidity bracket along the surface of the high-rigidity bracket, and the collision load can be effectively absorbed by almost the entire high-rigidity bracket.

[0021] As a result, in this aspect, the high-rigidity bracket can absorb impacts caused by high loads. Also, in this aspect, by intentionally applying shear force to the high-rigidity bracket, robustness can be achieved in the bracket.

[0022] On the other hand, at least a portion of the low-rigidity bracket is formed with a concave-convex shape along the vehicle longitudinal direction. Therefore, in this aspect, when a tensile load is applied to the low-rigidity bracket, the concave-convex shape is stretched and the low-rigidity bracket is extensible. For example, when a side collision load is applied to the vehicle, a tensile force acts on the bracket due to the difference in relative movement between the battery and the body.

[0023] In this aspect, the low-rigidity bracket has a longer wire length than the high-rigidity bracket, so even if the high-rigidity bracket breaks, the low-rigidity bracket can avoid breaking. Therefore, in this aspect, the battery can be supported by the low-rigidity bracket, and it is possible to prevent the battery from falling due to the input of a collision load.

[0024] A battery mounting structure of a sixth aspect of the present invention is a battery mounting structure of any one of the first to fifth aspects of the present invention, wherein the brackets are provided on the left and right sides of the battery in the vehicle width direction.

[0025] In the sixth aspect of the battery mounting structure, the brackets are provided on the left and right sides of the battery in the vehicle width direction, which makes it possible to suppress vibration of the battery itself compared to when the brackets are provided only in the center of the battery in the vehicle width direction.

[0026] A battery mounting structure according to a seventh aspect of the present invention is the battery mounting structure according to any one of the second to sixth aspects of the present invention, wherein the high-rigidity brackets are formed so as to be connected to each other on the left and right.

[0027] In the battery mounting structure of the seventh aspect, the high-rigidity brackets provided on the left and right sides in the vehicle width direction are connected to each other, thereby improving the rigidity of the high-rigidity brackets. This makes it possible to absorb impacts caused by high loads. Furthermore, in this aspect, the improved rigidity of the high-rigidity brackets improves NV performance.

[0028] The battery mounting structure of an eighth aspect of the present invention is a battery mounting structure of any one of the first to seventh aspects of the present invention, wherein the second connection portion with the body of the bracket is located more inward in the vehicle width direction than the first connection portion with the battery.

[0029] In the battery mounting structure of the eighth aspect, the brackets are connected to the left and right sides of the battery in the vehicle width direction, and the second connection part with the body is located more inward in the vehicle width direction than the first connection part with the battery. In other words, a truss structure can be formed between the battery, bracket, and body, which can improve the connection rigidity between the members and further improve the NV performance. [Effects of the Invention]

[0030] According to the battery mounting structure of the first aspect, it is possible to achieve both the collision performance and the NV performance of the vehicle.

[0031] According to the battery mounting structure of the second aspect, the bracket can be made compact when viewed from above the vehicle.

[0032] According to the battery mounting structure of the third aspect, it is possible to prevent the function of the low-rigidity bracket from being impaired by a broken high-rigidity bracket.

[0033] According to the battery mounting structure of the fourth aspect, even if the high-rigidity bracket breaks, the battery can be supported by the low-rigidity bracket.

[0034] According to the battery mounting structure of the fifth aspect, the high-rigidity bracket can absorb impacts caused by a high load, and the low-rigidity bracket can support the battery even if the high-rigidity bracket breaks.

[0035] According to the battery mounting structure of the sixth aspect, the NV performance can be improved.

[0036] According to the battery mounting structure of the seventh aspect, the rigidity of the bracket is improved, and the NV performance can be improved.

[0037] According to the battery mounting structure of the eighth aspect, the joint rigidity between the members is improved, and the NV performance can be further improved. [Brief explanation of the drawings]

[0038] [Figure 1] 1 is a bottom view showing a vehicle to which a battery mounting structure according to an embodiment of the present invention is applied. [Figure 2] FIG. 2 is an enlarged bottom view showing a main part of the battery mounting structure according to the present embodiment. [Figure 3] 1A and 1B are enlarged cross-sectional views showing a main part of the battery mounting structure according to the present embodiment, in which FIG. 1A is a cross-sectional view before a vehicle collision and FIG. 1B is a cross-sectional view after the vehicle collision. [Figure 4] 5A and 5B are schematic diagrams for explaining the operation of the battery mounting structure according to the present embodiment. [Figure 5] FIG. 5 is a schematic diagram for illustrating a comparative example corresponding to FIG. 4. [Figure 6] This figure shows a vehicle to explain the issues with the battery mounting structure, where (A) is a bottom view before the side collision, (B) is a bottom view after the side collision, and (C) is an enlarged view of a portion of (B). DETAILED DESCRIPTION OF THE INVENTION

[0039] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. For ease of explanation, the arrow UP shown in each drawing indicates the upward direction of the vehicle, the arrow FR indicates the forward direction of the vehicle, and the arrow RH indicates the rightward direction of the vehicle. Furthermore, in the following description, unless otherwise specified, when up / down, front / rear, and left / right directions are mentioned, they refer to up / down in the vertical direction of the vehicle, front / rear in the longitudinal direction of the vehicle, and left / right in the lateral direction of the vehicle (vehicle width direction).

[0040] <Battery mounting structure configuration> First, the configuration of the battery mounting structure 10 according to this embodiment will be described.

[0041] Fig. 1 shows a bottom view of a vehicle 12 to which a battery mounting structure 10 according to this embodiment is applied, and Fig. 2 shows an enlarged bottom view of a main part of the battery mounting structure 10 shown in Fig. 1. As shown in Figs. 1 and 2, the vehicle 12 to which the battery mounting structure 10 according to this embodiment is applied is, for example, an electric vehicle or a fuel cell vehicle that runs on power generated by a power unit, and a battery 16 is mounted below a floor panel 14 that forms the floor of the vehicle interior.

[0042] A pair of left and right rockers 18 extend in the vehicle longitudinal direction on both outer sides of the floor panel 14 in the vehicle width direction, and a cross member 20 extends in the vehicle width direction between the left and right rockers 18 at approximately the center of the rockers 18 in the vehicle longitudinal direction. A central portion 16A and an upper end (not shown) of the battery 16 in the vehicle longitudinal direction is fixed to this cross member 20, and the battery 16 is positioned inside the left and right rockers 18 in the vehicle width direction when viewed from above the vehicle.

[0043] A pair of left and right front side members 22 extend in the vehicle longitudinal direction in front of the battery 16, and a front bumper 24 extends in the vehicle width direction in front of the pair of left and right front side members 22. In addition, a front suspension 30 that supports lower arms 28 connected to front wheels 26 and the like is provided on the pair of left and right front side members 22.

[0044] Furthermore, a connecting member 32 that is connected to the front end of the rocker 18 is provided at the rear end of the pair of left and right front side members 22, and a front end corner 16B of the battery 16 is fixed to the connecting member 32.

[0045] Meanwhile, a pair of left and right rear side members 34 extend in the longitudinal direction of the vehicle behind the battery 16, and a rear bumper 36 extends in the transverse direction of the vehicle behind the pair of left and right rear side members 34. In addition, the pair of left and right rear side members 34 are provided with rear suspensions (not shown) that support lower arms 40 connected to rear wheels 38 and the like.

[0046] Furthermore, a plurality of cross members 42 are fixed between the pair of left and right rear side members 34, and of the plurality of cross members 42, cross member 42A arranged on the battery 16 side is provided with a mounting portion 44 that is substantially rectangular in shape as seen from the bottom of the vehicle, in the center in the vehicle width direction. A bracket 46 is provided between the mounting portion 44 and the battery 16, and the battery 16 is fixed to the mounting portion 44 (on the body 11 side) via the bracket 46.

[0047] In this embodiment, the mounting portion 44 has a substantially rectangular shape when viewed from the bottom of the vehicle, but is not limited to this. For example, although not shown, the mounting portion 44 may be formed of multiple substantially rectangular members extending in the front-to-rear direction of the vehicle.

[0048] (bracket) Here, the bracket 46 in this embodiment will be described.

[0049] In this embodiment, the bracket 46 is configured to include at least two members having different rigidity (a high-rigidity bracket 48 and a low-rigidity bracket 50, which will be described later). Of these two members, the member having a relatively high rigidity is referred to as the high-rigidity bracket 48, and the member having a relatively low rigidity is referred to as the low-rigidity bracket 50. In this embodiment, the high-rigidity bracket 48 and the low-rigidity bracket 50 are made of, for example, a steel plate or an aluminum alloy plate, but the high-rigidity bracket 48 and the low-rigidity bracket 50 may be made of different materials.

[0050] 2 and 3A, the bracket 46 is configured so that the high-rigidity bracket 48 and the low-rigidity bracket 50 overlap in a plan view of the vehicle, with the low-rigidity bracket 50 disposed above the high-rigidity bracket 48. A front end 46A of the bracket 46 is coupled to the rear end 16C of the battery 16, and a rear end 46B of the bracket 46 is coupled to the front end 44A of the mounting portion 44.

[0051] (High-rigidity bracket) First, the high-rigidity bracket 48 in this embodiment will be described.

[0052] 2, the high-rigidity bracket 48 includes a pair of left and right connecting portions 52 that can be connected to both ends of the rear end 16C of the battery 16 in the vehicle width direction, a pair of left and right connecting portions 54 that can be connected to both ends of the front end 44A of the mounting portion 44 on the body 11 side in the vehicle width direction, and a pair of left and right extending portions 56 that connect the connecting portions 52 to the connecting portions 54. Furthermore, the left and right extending portions 56 of the high-rigidity bracket 48 are connected to each other by a connecting portion 58 that extends in the vehicle width direction.

[0053] The mounting portion 44 is provided on the inner side in the vehicle width direction than the battery 16. Therefore, in the high-rigidity bracket 48, an extension portion 56 that connects a joining portion 52 that is joined to the end of the battery 16 in the vehicle width direction and a joining portion 54 that is joined to the end of the mounting portion 44 in the vehicle width direction is inclined inward in the vehicle width direction as it extends rearward in the vehicle fore-and-aft direction.

[0054] 3(A), the battery 16 is disposed below the floor panel 14 (see FIG. 1), and a height difference H is provided between the battery 16 and the body 11. For this reason, the extension portion 56 of the high-rigidity bracket 48 is formed so as to linearly connect the joint portion 52 and the joint portion 54, and the extension portion 56 and the connecting portion 58 are formed so as to incline upward toward the vehicle rear.

[0055] (Low rigidity bracket) Next, the low-rigidity bracket 50 in this embodiment will be described.

[0056] As shown in Figure 2, the low-rigidity bracket 50 is composed of a pair of left and right connecting portions 60 that overlap the pair of left and right connecting portions 52 of the high-rigidity bracket 48, respectively, a pair of left and right connecting portions 62 that overlap the pair of left and right connecting portions 54 of the high-rigidity bracket 48, and a pair of left and right extending portions 64 that connect each connecting portion 60 to each connecting portion 62.

[0057] Furthermore, the extending portion 64 is inclined inward in the vehicle width direction as it extends rearward in the vehicle longitudinal direction, similar to the extending portion 56 of the high-rigidity bracket 48. Furthermore, as shown in Fig. 3(A), the extending portion 64 is formed to be inclined upward in the vehicle as it extends rearward in the vehicle longitudinal direction, and is formed in an uneven (wavy) shape along the vehicle longitudinal direction.

[0058] In this manner, in this embodiment, the low-rigidity bracket 50 is formed in an uneven shape, so that the low-rigidity bracket 50 has a longer line length than the high-rigidity bracket 48, and is therefore less rigid than the high-rigidity bracket 48. In other words, the low-rigidity bracket 50 and the high-rigidity bracket 48 in this embodiment have different rigidities due to, for example, the difference in line length.

[0059] As shown in FIG. 2, the joint portion 52 of the high-rigidity bracket 48 and the joint portion 60 of the low-rigidity bracket 50 are fastened together by a fastening member such as a bolt (not shown) (first joint portion 66), and the joint portion 54 of the high-rigidity bracket 48 and the joint portion 62 of the low-rigidity bracket 50 are fastened together by a fastening member such as a bolt (not shown) (second joint portion 68).

[0060] <Actions and effects of the battery mounting structure> Next, the operation and effects of the battery mounting structure 10 according to this embodiment will be described.

[0061] 1 and 2, in this embodiment, the battery mounting structure 10 includes a bracket 46 and a battery 16. The bracket 46 includes at least two members with different rigidity (a high-rigidity bracket 48 and a low-rigidity bracket 50). The battery 16 is connected to the body 11 via the bracket 46, and the battery 16 is mounted on the lower side of the floor panel 14.

[0062] In this embodiment, the two members constituting the bracket 46 have different rigidities, and therefore the bracket 46 is configured to include a high-rigidity bracket 48 having a relatively high rigidity of the two members, and a low-rigidity bracket 50 having a relatively low rigidity. In this way, by connecting the battery 16 to the body 11 via the bracket 46 including the high-rigidity bracket 48, the mounting rigidity of the battery 16 is improved, vibration of the battery 16 itself is suppressed, and the NV performance of the vehicle 12 can be improved.

[0063] On the other hand, for example, as a comparative example, as shown in Figures 6(A) and (B), when a side impact load (collision load) F is input to the side of the body (vehicle) 100 (a so-called side pole collision), a difference in relative movement occurs between the battery 102 and the mounting portion 104 on the body 100 side. As a result, a pulling force (arrow A) acts on the bracket 106 that connects the battery 102 and the mounting portion 104, and as shown in Figures 6(B) and (C), there is a possibility that the bracket 106 will break (marked with an x). Note that Figure 6(C) is a partial enlarged view showing an enlarged portion A of Figure 6(B).

[0064] 2 and 3(A) is configured to include at least two members with different rigidity, so even if the high-rigidity bracket 48 breaks, the low-rigidity bracket 50 will not break, and the low-rigidity bracket 50 will be able to support the battery 16. As a result, in this embodiment, it is possible to prevent the battery 16 from falling off the body 11 in the event of a collision of the vehicle 12.

[0065] In this manner, in the present embodiment, by enabling the low-rigidity bracket 50 to support the battery 16 during a collision of the vehicle 12, the high-rigidity bracket 48 can receive the collision load F until it breaks. That is, in the present embodiment, EA under high loads is possible for the high-rigidity bracket 48, and the high-rigidity bracket 48 can maximize its function as an impact absorbing member under high loads.

[0066] As described above, in this embodiment, by connecting the battery 16 to the body 11 using a bracket 46 that includes at least two members with different rigidities, it is possible to achieve both collision performance and NV performance of the vehicle 12.

[0067] As a comparative example (not shown), if the bracket 46 is made up of only one member, and this member breaks, the battery 16 will fall off the body 11. Therefore, in the comparative example, it is necessary to prevent the bracket 46 from breaking. Therefore, measures such as increasing the thickness of the bracket 46 can be taken to suppress deformation of the bracket 46 itself.

[0068] In contrast, in this embodiment, even if the high-rigidity bracket 48 breaks, the battery 16 can still be supported by the low-rigidity bracket 50, so the plate thickness of the high-rigidity bracket 48 can be made thinner than in the comparative example, making it possible to reduce the weight of the vehicle 12.

[0069] 2, the high-rigidity bracket 48 and the low-rigidity bracket 50 are configured to overlap in a plan view of the vehicle. For example, as a comparative example (not shown), compared to a case in which the high-rigidity bracket 48 is provided on the outer side in the vehicle width direction and the low-rigidity bracket 50 is provided on the inner side in the vehicle width direction of the bracket 46, it is possible to avoid interference with other components disposed below the floor panel 14. For this reason, in this embodiment, the bracket 46 can be formed compactly in a plan view of the vehicle.

[0070] Furthermore, in this embodiment, as shown in Fig. 3(A), a low-rigidity bracket 50 is provided above the high-rigidity bracket 48 in the vehicle up-down direction. Therefore, as shown in Fig. 3(B), even if the high-rigidity bracket 48 breaks, the broken high-rigidity bracket 48 will not fall onto the low-rigidity bracket 50. In other words, in this embodiment, the function of the low-rigidity bracket 50 is not impaired by a broken high-rigidity bracket 48.

[0071] Furthermore, in this embodiment, the low-rigidity bracket 50 is set so that the line length along the separation distance between the battery 16 and the body 11 is longer than that of the high-rigidity bracket 48. As a result, in this embodiment, after the high-rigidity bracket 48 is broken by the input of the collision load F, the low-rigidity bracket 50 can support the battery 16.

[0072] For example, as described above, when a collision load F is input to the vehicle 100 shown in Fig. 6(B) as a comparative example, a pulling force (arrow A) acts on the bracket 106. In this embodiment, as shown in Fig. 3(A), the low-rigidity bracket 50 has a longer line length than the high-rigidity bracket 48. Therefore, even if the high-rigidity bracket 48 breaks due to the input of the collision load F, as shown in Fig. 3(B), the low-rigidity bracket 50 is prevented from breaking, and the low-rigidity bracket 50 can support the battery 16. As a result, in this embodiment, it is possible to prevent the battery 16 from falling due to the input of the collision load F.

[0073] 3A, in this embodiment, the high-rigidity bracket 48 is formed in a flat shape. Therefore, the collision load F input to the high-rigidity bracket 48 is transmitted along the surface of the high-rigidity bracket 48. Therefore, a shear force acts on the high-rigidity bracket 48 along the shape of the high-rigidity bracket 48, and the collision load F can be effectively absorbed by substantially the entire high-rigidity bracket 48.

[0074] As a result, in this embodiment, impact absorption due to a high load is possible in the high-rigidity bracket 48. Also, in this embodiment, by intentionally applying a shear force to the high-rigidity bracket 48, robustness is obtained in the bracket 46.

[0075] In this embodiment, at least a portion of the low-rigidity bracket 50 is formed with projections and recesses along the vehicle longitudinal direction. Therefore, when a tensile load is input to the low-rigidity bracket 50, the projections and recesses are stretched, making the low-rigidity bracket 50 extensible, as shown in FIG. 3(B).

[0076] As described above, when a collision load F is input to the vehicle 100 shown in Figures 6(B) and (C) as a comparative example, a pulling force (arrow A) acts on the bracket 106 due to the difference in relative movement that occurs between the battery 102 and the body 104.

[0077] In this embodiment, as shown in Fig. 3(A), the low-rigidity bracket 50 has a longer line length than the high-rigidity bracket 48, and therefore, as shown in Fig. 3(B), even if the high-rigidity bracket 48 breaks, the low-rigidity bracket 50 can be prevented from breaking. Therefore, in this embodiment, the low-rigidity bracket 50 can support the battery 16, and it is possible to prevent the battery 16 from falling due to the input of the collision load F.

[0078] That is, in this embodiment, the high-rigidity bracket 48 can absorb the impact caused by a high load, and even if the high-rigidity bracket 48 breaks, the low-rigidity bracket 50 can support the battery 16.

[0079] 1 and 2, in this embodiment, the brackets 46 are joined to the left and right sides of the battery 16 in the vehicle width direction. As a result, although not shown, in this embodiment, vibration of the battery 16 itself can be suppressed compared to when the brackets 46 are joined only to the center of the battery 16 in the vehicle width direction, and the NV performance can be further improved.

[0080] Furthermore, in this embodiment, as shown in FIG. 4, the extension portions 56 provided on the left and right sides of the high-rigidity bracket 48 in the vehicle width direction are connected to each other via a connecting portion 58.

[0081] For example, as a comparative example, in the case of a high-rigidity bracket 110, as shown in FIG. 5, if the connecting portion 58 is not provided for a pair of extension portions 112 provided on the left and right sides in the vehicle width direction, the bracket 116 may follow the vibration of the battery 114 in the vehicle width direction, and may fall over sideways.

[0082] 4, the pair of left and right extension portions 56 are connected via the connecting portion 58, and therefore it is possible to improve rigidity by utilizing the shear force by applying a shear force to the vibration of the battery 16 in the vehicle width direction. As a result, in this embodiment, it is possible to reduce the vibration of the battery 16 in the vehicle width direction, and the NV performance is improved.

[0083] Furthermore, in this embodiment, the brackets 46 are provided on the left and right sides of the battery 16 in the vehicle width direction, and the second joint portion 68 with the body 11 is provided more inward in the vehicle width direction than the first joint portion 66 with the battery 16. In other words, a truss structure can be formed between the battery 16, the brackets 46, and the body 11, which can improve the joint rigidity between the members and further improve the NV performance.

[0084] <Supplementary notes on the above embodiment> 2, in this embodiment, the bracket 46 is composed of a high-rigidity bracket 48 and a low-rigidity bracket 50, which have different rigidities. This embodiment is not limited to this, as it is sufficient that the bracket 46 includes at least two members with different rigidities, and that even if the high-rigidity bracket 48 is broken by the input of a collision load F, the low-rigidity bracket 50 can still support the battery 16. For example, the bracket 46 may be composed of three or more members, including members with rigidity other than the high-rigidity bracket 48 and the low-rigidity bracket 50.

[0085] Furthermore, in the present embodiment, the high-rigidity bracket 48 and the low-rigidity bracket 50 in the bracket 46 are configured to overlap when viewed from above the vehicle. This allows the bracket 46 to be made more compact in the present embodiment, but this is not necessarily limited to this. For example, although not shown, in the bracket 46, the high-rigidity bracket 48 may be provided on the outer side in the vehicle width direction and the low-rigidity bracket 50 may be provided on the inner side in the vehicle width direction in relation to peripheral components.

[0086] 3A, in this embodiment, the low-rigidity bracket 50 is provided above the high-rigidity bracket 48 in the vehicle vertical direction. This prevents a broken high-rigidity bracket 48 from falling onto the low-rigidity bracket 50 in this embodiment, but this is not necessarily limited to this. In other words, depending on the shape of the components, the high-rigidity bracket 48 and the low-rigidity bracket 50 may be arranged upside down.

[0087] 2, in the present embodiment, the pair of left and right extension portions 56 in the high-rigidity bracket 48 are connected via a connecting portion 58. This improves the rigidity of the high-rigidity bracket 48 in the present embodiment, and can further suppress vibration of the battery 16 itself; however, the connecting portion 58 is not necessarily required as long as the rigidity of the high-rigidity bracket 48 can be ensured.

[0088] 3A, the low-rigidity bracket 50 is formed in an uneven shape along the vehicle longitudinal direction, but the uneven shape is not limited to this as long as it is extendable along the vehicle longitudinal direction. Also, the low-rigidity bracket 50 does not necessarily have to be uneven, and may be formed in a curved shape along the vehicle longitudinal direction as long as it can be formed to have a longer linear length than the high-rigidity bracket 48.

[0089] Furthermore, in this embodiment, as shown in FIG. 2, the second connection portion 68 of the bracket 46 with the body 11 is located further inward in the vehicle width direction than the first connection portion 66 with the battery 16, but this is not necessarily limited to this.

[0090] In addition, in this embodiment, the bracket 46 is provided on the rear side of the battery 16, but if a bracket is also provided on the front side of the battery 16, although this is not shown, the bracket 46 may also be applied.

[0091] The above describes one example of the present invention, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0092] 10 Battery mounting structure 11 Body 12 vehicles 14 Floor Panel 16 Battery 44 Mounting part (body) 46 Bracket 48 High-rigidity bracket 50 Low rigidity bracket 66 Joint part (1st joint part) 68 Joint part (second joint part)

Claims

1. a bracket including at least two members having different rigidities; a battery coupled to the body via the bracket and mounted on a lower side of a floor panel constituting a floor portion of the body; a battery mounting structure comprising:

2. 2. The battery mounting structure according to claim 1, wherein the high-rigidity bracket having the higher rigidity and the low-rigidity bracket having the lower rigidity are configured to overlap in a plan view of the vehicle.

3. 3. The battery mounting structure according to claim 2, wherein the low-rigidity bracket is provided above the high-rigidity bracket in the vehicle vertical direction.

4. 3. The battery mounting structure according to claim 2, wherein the low-rigidity bracket is formed so that the linear length along the distance between the battery and the body is longer than that of the high-rigidity bracket.

5. 3. The battery mounting structure according to claim 2, wherein the high-rigidity bracket is formed in a flat shape, and at least a portion of the low-rigidity bracket is formed in an uneven shape along the longitudinal direction of the vehicle.

6. 2. The battery mounting structure according to claim 1, wherein the brackets are provided on the left and right sides of the battery in the vehicle width direction.

7. 3. The battery mounting structure according to claim 2, wherein the high-rigidity bracket is formed so as to be connected to the left and right sides.

8. In the bracket, 2. The battery mounting structure according to claim 1, wherein the second connection portion with the body is located more inward in the vehicle width direction than the first connection portion with the battery.

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