Battery loading structure

Abstract

To provide a battery loading structure which can suppress vibration of a vehicle body and improve impact resistance performance at the time of collision.SOLUTION: A vehicle 10 includes a coupling part 30 between a vehicle body 12 constituting a skeleton of the vehicle 10 and a battery case 24 loaded at a lower side of a floor panel 20 of the vehicle 10 where an elastic member 60 lies between a first coupling member 40 connected to the vehicle body 12 side and a second coupling member 42 connected to the battery case 24 side. Thereby, the battery case 24 that is a heavy load works as a dynamic damper to suppress vibration of the vehicle body 12. A projection 50 projected from the second coupling member 42 is arranged at a first interstice G between the first coupling member 40 and the second coupling member 42. Load that is inputted into the vehicle body 12 is rapidly transmitted through the projection 50 to the battery case 24 side to be capable of distributing the load so that impact resistance performance at the time of collision can be improved.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] Patent Document 1 discloses that an elastic support member is provided between the battery device and the vehicle body, and the battery device is elastically supported on the vehicle body, so that the battery device functions as a dynamic damper to suppress vibrations of the vehicle body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-014384 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, from the viewpoint of improving impact resistance during a collision, it is desirable to quickly transmit the load input to the vehicle body during a collision to the battery case side to disperse the load; however, in Patent Document 1, because the battery device is elastically supported relative to the vehicle body, there is room for improvement in terms of ensuring a rapid load transmission path.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a battery mounting structure that can suppress vibration of the vehicle body and improve impact resistance performance in the event of a collision. [Means for solving the problem]

[0006] The battery mounting structure of claim 1 comprises a body that forms the skeleton of a vehicle, a battery case that is connected to the body and mounted under the floor of the vehicle, a first connecting member that is connected to the body at the connection between the body and the battery case, a second connecting member that is connected to the battery case and is attached with a predetermined gap from the first connecting member, an elastic member that is disposed in the gap and is interposed between the first connecting member and the second connecting member, and a protrusion that protrudes into the gap from one of the first connecting member and the second connecting member.

[0007] In the battery mounting structure according to claim 1, at the joint between the body constituting the vehicle framework and the battery case mounted under the floor of the vehicle, an elastic member is interposed between the first connecting member connected to the body side and the second connecting member connected to the battery case side, so that the battery case, which is a heavy object, functions as a dynamic damper to suppress vibration of the body.

[0008] In addition, a protrusion protruding from one of the first and second connecting members is provided in the gap provided between the first and second connecting members. Therefore, the load input to the body can be quickly transmitted to the battery case side via the protrusion to disperse the load, thereby improving impact resistance during a collision.

[0009] The battery mounting structure of claim 2 is the same as claim 1, and further has a support member extending from the side of the battery case toward the body, and the second connecting member is connected to the battery case via the support member.

[0010] In the battery mounting structure according to claim 2, the battery case and the second connecting member are connected via a support member extending from the side of the battery case toward the body. This allows the connecting portion between the body and the battery case to be disposed on the side of the battery case, and the mounting space for the battery case can be reduced in the vehicle height direction compared to a configuration in which the battery case is elastically supported from the lower side of the vehicle. As a result, the space efficiency of the lower part of the vehicle is improved, and it becomes easier to expand the vehicle interior space provided above the floor and ensure the height of the bottom surface of the vehicle body.

[0011] The battery mounting structure of claim 3 is the same as claim 2, wherein the support member has a first support portion arranged on the vehicle outer side relative to the second connecting member, and a second support portion arranged on the vehicle inner side relative to the second connecting member.

[0012] In the battery mounting structure according to claim 3, the support member has a first support part arranged on the vehicle outer side relative to the second connecting member, and a second support part arranged on the vehicle inner side relative to the second connecting member. This allows a load input to the vehicle lower part to be quickly transmitted to the battery case side via the first support part, thereby improving impact resistance during a collision.

[0013] The battery mounting structure according to claim 4 is the same as any one of claims 1 to 3, wherein a tip of the protrusion is provided spaced apart from the opposing surface.

[0014] In the battery mounting structure according to claim 4, the tip of the protrusion is provided away from the opposing surface, so that the tip of the protrusion does not interfere with the opposing surface when the body and the battery case vibrate, thereby making it possible to suppress the generation of abnormal noise caused by contact between the protrusion and the opposing surface when the body and the battery case vibrate.

[0015] The battery mounting structure of claim 5 is, in any one of claims 1 to 3, wherein the first connecting member and the second connecting member are formed in a cylindrical shape with the axial direction being in the vertical direction of the vehicle, the first connecting member is inserted inside the second connecting member, and the elastic member has a first elastic portion arranged on one axial side of the protrusion, and a second elastic portion arranged on the other axial side of the protrusion.

[0016] In the battery mounting structure according to claim 5, the first and second joining members are formed in a tubular shape with the vehicle vertical direction as the axial direction, and the first joining member is inserted inside the second joining member. Also, the elastic member has a first elastic portion arranged on one side of the axial direction with respect to the protruding portion, and a second elastic portion arranged on the other side of the axial direction. This makes it possible to stabilize vibration in the vehicle vertical direction (gravity direction) using the weight of the battery case. Effect of the Invention

[0017] As described above, the battery mounting structure according to the present invention can suppress vibration of the vehicle body and improve impact resistance during a collision. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic diagram of a body of a vehicle according to an embodiment, viewed from a vehicle width direction. [Diagram 2] 4 is a schematic view of a joint between a body of a vehicle and a battery case according to an embodiment, as viewed from below the vehicle. FIG. [Diagram 3] 3 is a cross-sectional view showing a state cut along line III-III in FIG. 2. [Figure 4] 3 is an enlarged cross-sectional view showing a first joining member and a second joining member according to the embodiment. FIG. [Diagram 5] FIG. 11 is a cross-sectional view showing a first connecting member and a second connecting member according to a first modified example. [Figure 6] 13 is a cross-sectional view showing a second joining member according to a second modified example. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] A vehicle 10 equipped with a battery mounting structure according to an embodiment will be described with reference to the drawings. In each drawing, the arrow UP indicates the upper side in the vertical direction of the vehicle, the arrow FR indicates the front side in the longitudinal direction of the vehicle, and the arrow LH indicates the left side in the width direction of the vehicle. In the following description, the vertical direction and the left-right direction respectively mean the up-down direction in the vertical direction of the vehicle and the left-right direction in the width direction of the vehicle.

[0020] (Body) 1 is a schematic diagram of a body 12 constituting the framework of a vehicle 10, as viewed from the vehicle width direction. As shown in this figure, the body 12 includes rockers 14 constituting the framework of the lower part of the vehicle. The rockers 14 are formed in the shape of hollow beams extending in the vehicle front-rear direction, and are arranged in pairs with a gap in between in the vehicle width direction.

[0021] The rocker 14 is composed of a rocker outer 16 made of sheet metal and arranged on the outer side in the vehicle width direction, and a rocker inner 18 made of sheet metal and arranged on the inner side in the vehicle width direction with respect to the rocker outer 16. As shown in Fig. 3, the rocker outer 16 has a generally hat-shaped cross section that opens to the inner side in the vehicle width direction, and flanges are formed at the upper end and the lower end of the rocker outer 16. The rocker inner 18 has a generally hat-shaped cross section that opens to the outer side in the vehicle width direction, and flanges are formed at the upper end and the lower end of the rocker inner 18. The rocker 14 is formed by overlapping the rocker outer 16 and the rocker inner 18 in the vehicle width direction, and joining the flanges at the upper end and the flanges at the lower end by welding or the like. As a result, the rocker 14 is configured to form a rectangular closed cross-section by an upper wall portion 14A that forms the upper surface, a lower wall portion 14B that forms the lower surface, an outer wall portion 14C that connects the outer ends of the upper wall portion 14A and the lower wall portion 14B, and an inner wall portion 14D that connects the inner ends of the upper wall portion 14A and the lower wall portion 14B.

[0022] (Floor panel) A metal floor panel 20 is disposed inside the pair of left and right rockers 14. The floor panel 20 extends in the vehicle front-rear direction and width direction and constitutes the floor of the vehicle compartment. The outer periphery of the floor panel 20 is joined by welding or the like to the upper wall portions 14A of the left and right rockers 14 and to a cross member (not shown) that spans between the rockers 14.

[0023] (Battery case) A battery case 24 housing a plurality of secondary batteries is mounted below the floor panel 20. The battery case 24 is formed in a flat rectangular box shape and extends in the vehicle front-rear direction and the vehicle width direction. As shown in FIG. 3, the battery case 24 is composed of a box-shaped lower case 26 that opens toward the upper side of the vehicle and a box-shaped upper case 28 that opens toward the lower side of the vehicle. The battery case 24 is formed by joining the outer periphery of the lower case 26 and the outer periphery of the upper case 28 in the vertical direction of the vehicle. The lower case 26 and the upper case 28 can be composed of sheet metal, laminate film, or the like.

[0024] (joint part) 1, the outer periphery of the battery case 24 is connected to the body 12 via a plurality of connecting portions 30. In this embodiment, as an example, connecting portions 30 are provided on the front and rear ends of each rocker 14 in the vehicle longitudinal direction, and the battery case 24 is connected to the rocker 14 at a total of four locations.

[0025] 2 shows a connection portion 30 that connects the locker 14 and the battery case 24 located on the left side of the vehicle 10, as viewed from below the vehicle. As shown in this figure, the locker 14 and the battery case 24 are connected in the vehicle width direction via a long support member 32.

[0026] As shown in FIG. 3, the support member 32 is formed in a hollow beam shape and extends in the vehicle width direction.

[0027] An end of the support member 32 on the inner side in the vehicle width direction is joined to one end of the bracket 22 extending from the battery case 24 by using a bolt 38 and a nut 39. The other end of the bracket 22 is joined to the bottom wall portion 24A that constitutes the lower surface of the battery case 24. In this state, the support member 32 is disposed opposite the side wall portion 24B of the battery case 24, and the support member 32 extends from the side of the battery case 24 toward the locker 14.

[0028] The outer end of the support member 32 in the vehicle width direction is connected to the lower wall portion 14B of the rocker 14 via a first connecting member 40, a second connecting member 42, and an elastic member 60. In this state, the bottom wall portion 24A of the battery case 24 is set at a position lower than the height of the lower wall portion 14B of the rocker 14.

[0029] The first connecting member 40 is connected to the lower wall portion 14B of the rocker 14 by using a bolt 44 and a nut 45. The first connecting member 40 is a metallic tubular member whose axial direction is the vertical direction of the vehicle, and can be formed, for example, by a cylindrical collar.

[0030] 4, a bolt 44 is inserted into the first connecting member 40 from the lower side of the vehicle. The tip of the bolt 44 is inserted into a bolt hole 48 formed in the lower wall portion 14B of the rocker 14 and is configured to be screwed into a nut 45 welded around the bolt hole 48.

[0031] The second connecting member 42 is connected to the battery case 24 via the support member 32. The second connecting member 42 is a metallic tubular member whose axial direction is the vertical direction of the vehicle, and can be configured, for example, as a cylindrical collar having a larger diameter than the first connecting member. The axial length of the second connecting member 42 is set to be shorter than that of the first connecting member 40.

[0032] The second connecting member 42 is attached to the first connecting member 40 with a first gap G1 provided therebetween by inserting the first connecting member 40 inside.

[0033] The second connecting member 42 also has a protrusion 50 provided at the middle portion in the axial direction. The protrusion 50 is provided to protrude from the inner peripheral surface of the second connecting member 42 into the first gap G1. The protrusion 50 is disposed with a tip 50A close to the first connecting member 40. The tip 50A of the protrusion 50 is spaced from the opposing surface (outer peripheral surface) of the first connecting member 40, and a second gap G2 is provided between the tip 50A of the protrusion 50 and the first connecting member 40.

[0034] The protruding portion 50 may be formed in a ring shape or in an island shape. When the protruding portion 50 is formed in an island shape, a plurality of the protruding portions 50 may be arranged along the circumferential direction of the second connecting member 42.

[0035] The second connecting member 42 is inserted into a through-hole 52 formed in the support member 32. The through-hole 52 is a through-hole that penetrates the support member 32 in the vehicle up-down direction. With the second connecting member 42 inserted into the through-hole 52, a portion of the outer circumferential surface is connected to the support member 32 by welding or the like. In this way, the second supporting member 32 is connected to the battery case 24 via the supporting member 32.

[0036] The support member 32 has a first support portion 34 arranged on the vehicle outer side relative to the second connecting member 42, and a second support portion 36 arranged on the vehicle inner side relative to the second connecting member 42. Here, the second support portion 36 arranged between the second connecting member 42 and the battery case 24 has higher rigidity than the first support portion 34.

[0037] Here, the support member 32 will be described in detail. The support member 32 has a rectangular closed cross section in a direction perpendicular to the extension direction (vehicle front-rear direction). Further, a plate-shaped first reinforcing portion 32C that connects the upper surface portion 32A and the lower surface portion 32B in the up-down direction is provided inside the support member 32. A plurality of first reinforcing portions 32C are provided inside the support member 32 along the extension direction, and the inside of the support member 32 is divided into a plurality of spaces. Therefore, the cross section of the support member 32 along the extension direction forms a lattice shape. Further, inside the support member 32, a plurality of second reinforcing portions 32D are provided to connect adjacent first reinforcing portions 32C. The second reinforcing portions 32D are plate-shaped members that connect the upper and lower ends of adjacent first reinforcing portions 32C, and increase the rigidity of the closed cross section formed by the upper surface portion 32A, the lower surface portion 32B, and the first reinforcing portions 32C. The second reinforcing portions 32D are formed only in the second support portion 36 of the support member 32. Thus, in the support member 32, the rigidity of the second support portion 36 is higher than that of the first support portion 34.

[0038] When a load is input to the first support portion 34 of the support member 32 due to a side collision of the vehicle 10 or the like, the load is transmitted to the battery case 24 via the first support portion 34, the second connecting member 42, and the second support portion 36. At this time, in the first support portion 34, the closed cross section formed by the upper surface portion 32A, the lower surface portion 32B, and the first reinforcing portion 32C deforms to absorb the impact. On the other hand, in the second support portion 36, the deformation of the closed cross section formed by the upper surface portion 32A, the lower surface portion 32B, and the first reinforcing portion 32C is suppressed by the second reinforcing portion 32D. As a result, the load is quickly transmitted from the second support portion 36 to the battery case 24, dispersing the load and suppressing deformation of the rocker 14 toward the interior of the vehicle.

[0039] As shown in FIG. 4, an elastic member 60 is disposed in a first gap G1 provided between the first connecting member 40 and the second connecting member .

[0040] The elastic member 60 is composed of a first elastic portion 62 arranged on one axial side (upper side of the vehicle) of the protruding portion 50 of the second connecting member 42, and a second elastic portion 64 arranged on the other axial side (lower side of the vehicle) of the protruding portion 50. The first elastic portion 62 and the second elastic portion 64 can be composed of, for example, cylindrical bushings made of an elastic material such as rubber, and are arranged symmetrically in the axial direction with the protruding portion 50 as the center.

[0041] The first elastic portion 62 is interposed between the first connecting member 40 and the second connecting member 42 in the first gap G1 formed on the upper side of the protrusion 50, and an axial end portion thereof covers a part of the upper surface of the second connecting member 42. The second elastic portion 64 is interposed between the first connecting member 40 and the second connecting member 42 in the first gap G1 formed on the lower side of the protrusion 50, and an axial end portion thereof covers a part of the upper surface of the second connecting member 42. The first elastic portion 62 and the second elastic portion 64 are configured to elastically deform in response to the axial displacement of the second connecting member 42.

[0042] (Action and Effects) With the configuration described above, in this embodiment, the battery case 24 mounted under the floor of the vehicle 10 is elastically supported by the body 12 via the joints 30. Therefore, the battery case 24, which is a heavy object, functions as a dynamic damper, and can suppress vibration of the body 12 when the vehicle 10 is traveling.

[0043] Specifically, an elastic member 60 is interposed between a first connecting member 40 connected to the body 12 side and a second connecting member 42 connected to the battery case 24 side, and the elastic member 60 functions as a spring member having a predetermined spring constant.

[0044] The relationship between the vibration frequency f [Hz] of the dynamic damper, which has the battery case 24 as its mass, the mass M [kg] of the battery case 24, and the spring constant K [N / m] of the elastic member 60 can be expressed by the following equation (1). (Formula 1) JPEG2025017842000002.jpg1751

[0045] Here, the vibration characteristics at the time of resonance of the body 12 have a peak frequency [Hz] corresponding to the peak of the vibration level [dB]. Therefore, in a dynamic damper in which the battery case 24 is a mass body, the spring constant K [N / m] of the elastic member 60 is set according to the mass M [kg] of the battery case 24 so that the frequency f [Hz] of the battery case 24 is equivalent to the peak frequency, thereby improving the vibration absorption effect of the bending vibration of the body 12.

[0046] In this embodiment, a protrusion 50 protruding from the second connecting member 42 is provided in the gap provided between the first connecting member 40 and the second connecting member 42. Therefore, the load input to the body 12 (rocker 14) can be quickly transmitted to the battery case 24 side via the protrusion 50 and dispersed, thereby improving impact resistance during a collision.

[0047] In this embodiment, the battery case 24 and the second connecting member 42 are connected via a support member 32 extending from the side of the battery case 24 toward the body 12. This allows the connecting portion 30 between the body 12 and the battery case 24 to be disposed on the side of the battery case 24, and the mounting space for the battery case 24 can be reduced in the vehicle height direction compared to a configuration in which the battery case 24 is elastically supported from the lower side of the vehicle. As a result, the space efficiency of the lower part of the vehicle is improved, and it becomes easier to expand the passenger compartment space provided on the floor panel 20 and ensure the height of the bottom surface of the vehicle body.

[0048] Furthermore, in this embodiment, the support member 32 has a first support portion 34 arranged on the vehicle outer side relative to the second connecting member 42, and a second support portion 36 arranged on the vehicle inner side relative to the second connecting member 42. This allows a load input to the lower part of the vehicle to be quickly transmitted to the battery case 24 side via the first support portion 34, improving impact resistance during a collision.

[0049] 3, in this embodiment, the battery case 24, the support member 32, the second connecting member 42, the protrusion 50 and the first connecting member 40 are arranged side by side in the vehicle width direction at a predetermined height position in the vehicle up-down direction. This improves the impact resistance performance in a side collision of the vehicle.

[0050] In addition, in this embodiment, the tip of the protrusion 50 is provided away from the opposing surface, so that the tip of the protrusion 50 does not interfere with the opposing surface when the body 12 and the battery case 24 vibrate. This makes it possible to suppress the generation of abnormal noise caused by contact between the protrusion 50 and the opposing surface when the body 12 and the battery case 24 vibrate.

[0051] Additionally, the elastic member 60 is not disposed in the second gap G2 provided between the protrusion 50 and the opposing surface. Therefore, when the load at the time of a collision is transmitted from the first connecting member 40 to the second connecting member 42, the tip of the protrusion 50 directly contacts the opposing surface. This allows the load to be transmitted through the contact surfaces in a metal-to-metal touch state, making it difficult for the contact surfaces to shift, and improving the efficiency of load transmission.

[0052] In this embodiment, the first connecting member 40 and the second connecting member 42 are formed in a tubular shape with the axial direction being the vehicle up-down direction, and the elastic member 60 has a first elastic portion 62 arranged on one side in the axial direction with respect to the protruding portion 50 and a second elastic portion 64 arranged on the other side in the axial direction. This makes it possible to stabilize vibrations in the vehicle up-down direction (gravity direction) that utilize the weight of the battery case 24.

[0053] [About modified examples] Although the battery mounting structure according to the embodiment has been described above, the present invention is not limited to the configuration described in the above embodiment. Each configuration of the above embodiment can be appropriately modified without departing from the gist of the invention.

[0054] (First Modification) For example, in the above embodiment, the protrusion 50 is configured to protrude from the second connecting member 42 into the first gap G1, but the present invention is not limited to this. As shown in Fig. 5, the protrusion 50 may be configured to protrude from the first connecting member 40 into the first gap G1. In this first modified example, the protrusion 50 is provided such that a tip 50A is spaced apart from the opposing surface (inner circumferential surface) of the second connecting member .

[0055] (Second Modification) In the above embodiment, the protrusion 50 is provided at the axial middle portion of the second coupling member 42, but the present invention is not limited to this. As shown in Fig. 6, the protrusion 50 may be provided at the axial end portion of the second coupling member 42. In the second modified example, a protrusion 50 is provided at the lower end in the axial direction of the second connecting member 42, and an elastic member 60 is disposed above the protrusion 50. Although not shown, a protrusion 50 may be provided on the upper end of the second connecting member 42 in the axial direction, and the elastic member 60 may be disposed below the protrusion 50.

[0056] In the above embodiment, the battery case 24 is elastically supported at the joint 30 between the rocker 14 and the battery case 24, but this is not limited to the above. The configuration of the joint 30 in the above embodiment can be applied to a joint between a frame member under the vehicle and a battery case. For example, it may be applied to a joint between a cross member extending in the vehicle width direction and a battery case.

[0057] In the above embodiment, the first connecting member 40 and the body 12 are connected with bolts and nuts, but they may be connected by welding. In addition, the battery case 24 and the support member 32 are connected via a bracket, but the present invention is not limited to this. For example, an end of the support member 32 in the extending direction may be connected to the side wall portion 24B of the battery case 24 by welding. In addition, for example, the upper surface of the support member 32 may be connected to a flange provided with a joint between the lower case 26 and the upper case 28 of the battery case 24 by bolts and nuts. [Explanation of symbols]

[0058] 10 Vehicles 12 Body 20 Floor panel (vehicle floor) 24 Battery case 30 Joint 32 Support member 34 1st support part 36 Second support part 40 First connecting member 42 Second connecting member 50 Protrusion 60 Elastic member 62 First elastic part 64 Second elastic part G1 1st gap (gap)

Claims

1. A body that constitutes the framework of the vehicle; a battery case coupled to the body and mounted under a floor of the vehicle; a first connecting member connected to the body at a connecting portion between the body and the battery case; a second connecting member connected to the battery case and attached to the first connecting member with a predetermined gap therebetween; an elastic member disposed in the gap and interposed between the first connecting member and the second connecting member; a protrusion provided so as to protrude into the gap from one of the first connecting member and the second connecting member; A battery mounting structure having the above structure.

2. The battery case further includes a support member extending from a side of the battery case toward the body, The second connecting member is connected to the battery case via the support member. The battery mounting structure according to claim 1 .

3. The support member is a first support portion disposed on an outer side of the vehicle with respect to the second connecting member; and a second support portion disposed on the vehicle inner side with respect to the second connecting member. The battery mounting structure according to claim 2 .

4. The protruding portion has a tip spaced apart from the opposing surface. The battery mounting structure according to any one of claims 1 to 3.

5. The first connecting member and the second connecting member are formed in a cylindrical shape with an axial direction extending in the vehicle up-down direction, The first connecting member is inserted inside the second connecting member, The elastic member is a first elastic portion disposed on one axial side of the protruding portion; A second elastic portion is disposed on the other axial side of the protruding portion. The battery mounting structure according to any one of claims 1 to 3.

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