Energy storage device mounting structure

Abstract

To provide a mounting structure for an energy storage device that allows for appropriate setting of the vibration resistance performance of the energy storage device depending on whether low-frequency vibrations or high-frequency vibrations are dominant. [Solution] The present invention provides a mounting structure for a power storage device that uses an anti-vibration mount capable of handling both high-frequency and low-frequency vibrations. The anti-vibration mount is configured to be switchable so that it disables the anti-vibration function for low-frequency vibrations when high-frequency vibrations may occur, and disables the anti-vibration function for high-frequency vibrations when low-frequency vibrations may occur.

Description

Technical Field

[0001] The present invention relates to a mounting structure of a power storage device.

Background Art

[0002] Patent Document 1 discloses a mounting structure of a power storage device that presses the upper surface of the power storage device using an elastic member.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional mounting structure of a power storage device, there is room for improvement in vibration resistance against high-frequency vibration and vibration resistance against low-frequency vibration.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a mounting structure of a power storage device capable of appropriately setting the vibration resistance performance of the power storage device both when low-frequency vibration is dominant and when high-frequency vibration is dominant.

Means for Solving the Problems

[0006] In order to solve the above problems and achieve the object, a mounting structure of a power storage device according to the present invention is a mounting structure of a power storage device using a vibration isolator capable of corresponding to both high-frequency vibration and low-frequency vibration, and the vibration isolator is configured to be switchable so that the vibration isolation function corresponding to the low-frequency vibration is invalidated in a situation where the high-frequency vibration may occur, and the vibration isolation function corresponding to the high-frequency vibration is invalidated in a situation where the low-frequency vibration may occur.

[0007] As a result, the mounting structure for the energy storage device according to the present invention allows for appropriate setting of the vibration resistance performance of the energy storage device in cases where low-frequency vibrations are dominant and cases where high-frequency vibrations are dominant.

[0008] Furthermore, the vibration-damping mount may be reversibly switchable between a vibration-damping function against high-frequency vibrations and a vibration-damping function against low-frequency vibrations.

[0009] This makes it possible to alternately switch the vibration resistance performance of the energy storage device depending on whether high-frequency vibrations are dominant or low-frequency vibrations are dominant.

[0010] Furthermore, the vibration-damping mount may be irreversibly switchable between a vibration-damping function against high-frequency vibrations and a vibration-damping function against low-frequency vibrations.

[0011] This makes it possible to set the optimal vibration resistance performance of the energy storage device for situations where high-frequency vibrations are dominant and situations where low-frequency vibrations are dominant.

[0012] Furthermore, the vibration-damping mount may be configured to switch between a vibration-damping function against high-frequency vibrations and a vibration-damping function against low-frequency vibrations by an external load input to the energy storage device.

[0013] This makes it possible to switch between vibration isolation functions for high-frequency vibrations caused by external load input to the energy storage device and vibration isolation functions for low-frequency vibrations. [Effects of the Invention]

[0014] The present invention provides a mounting structure for an energy storage device that allows for appropriate setting of the vibration resistance performance of the energy storage device depending on whether low-frequency vibrations are dominant or high-frequency vibrations are dominant. [Brief explanation of the drawing]

[0015] [Figure 1]FIG. 1 is an explanatory diagram showing how a battery pack according to Embodiment 1 is mounted on a vehicle. [Figure 2] FIG. 2 is a perspective view showing a schematic configuration of a vibration isolator according to Embodiment 1. [Figure 3] FIG. 3(a) is a cross-sectional view showing the vibration isolator in a vibration-isolating state. FIG. 3(b) is a cross-sectional view showing the vibration isolator in a fastened state. [Figure 4] FIG. 4(a) is a view showing the vibration-isolating state of a vibration isolator according to Embodiment 2. FIG. 4(b) is a view showing the fastened state of the vibration isolator according to Embodiment 2. [Figure 5] FIG. 5(a) is a view showing the vibration-isolating state of a vibration isolator according to Embodiment 3. FIG. 5(b) is a view showing the fastened state of the vibration isolator according to Embodiment 3. [Figure 6] FIG. 6(a) is a view showing the vibration-isolating state of a vibration isolator according to Embodiment 4. FIG. 6(b) is a view showing the fastened state of the vibration isolator according to Embodiment 4. [Figure 7] FIG. 7 is a cross-sectional view showing a schematic configuration of a vibration isolator according to Embodiment 5.

MODE FOR CARRYING OUT THE INVENTION

[0016] (Embodiment 1) Hereinafter, Embodiment 1 of the mounting structure of the power storage device according to the present invention will be described. Note that the present invention is not limited by this embodiment.

[0017] FIG. 1 is an explanatory diagram showing how a battery pack 2 according to Embodiment 1 is mounted on a vehicle 1. The vehicle 1 includes right and left front wheels 10FR, 10FL and right and left rear wheels 10RR, 10RL at its four corners, and mounts a battery pack 2, which is a power storage device, under the floor. The arrows of "front, rear, left, and right" in FIG. 1 are directions defined based on the vehicle 1. Hereinafter, when referring to the front side, the rear side, the right side, and the left side, it means the directions indicated by the arrows of "front, rear, left, and right". Note that the left-right direction of the vehicle 1 may be referred to as the vehicle width direction.

[0018] The battery case 20 of the battery pack 2 is fixed to, for example, the battery holding frame 11 or the like. The vehicle 1 has a structure in which the body and the vehicle body frame are fastened and held, and the battery holding frame 11 is fixed to the vehicle body frame. The fixing between the battery case 20 and the battery holding frame 11 is achieved by four brackets 21FR, 21FL, 21RR, 21RL provided at the four corners of the battery case 20 and four vibration isolators 3FR, 3FL, 3RR, 3RL. In the following description, when the four brackets 21FR, 21FL, 21RR, 21RL are not particularly distinguished, they are simply referred to as brackets 21. Also, in the following description, when the four vibration isolators 3FR, 3FL, 3RR, 3RL are not particularly distinguished, they are simply referred to as vibration isolators 3. The number of vibration isolators 3 is not limited to four as long as the battery pack 2 can be held via the brackets 21.

[0019] The battery pack 2 is fixed to the battery holding frame 11 via four brackets 21FR, 21FL, 21RR, 21RL and four vibration isolators 3FR, 3FL, 3RR, 3RL.

[0020] FIG. 2 is a perspective view showing a schematic configuration of the vibration isolator 3 according to Embodiment 1. The vibration isolator 3 according to Embodiment 1 can reversibly switch between a vibration isolation function for high-frequency vibration and a vibration isolation function for low-frequency vibration.

[0021] The vibration isolator 3 is composed of an upper pedestal 31, a rotating body 32, and a lower pedestal 33. The upper pedestal 31 is a portion to which the bracket 21 connected to the battery case 20 is fixed. The bracket 21 is placed on the upper pedestal 31, and the bracket 21 and the upper pedestal 31 are fastened and fixed by a bolt 41. The lower pedestal 33 is placed on the battery holding frame 11, and the battery holding frame 11 and the lower pedestal 33 are fastened and fixed by bolts 42 and 43. The rotating body 32 is placed on the lower pedestal 33. Also, the upper pedestal 31 is placed on the rotating body 32. And the rotating body 32 is held rotatably between the upper pedestal 31 and the lower pedestal 33 in a state of being sandwiched by the upper pedestal 31 and the lower pedestal 33 in the height direction.

[0022] The rotating body 32 is constructed by sandwiching a plate-shaped vibration-damping rubber 322 between two semi-cylindrical members 321 and 323, which have a semicircular cross-section perpendicular to the axial direction. The semi-cylindrical members 321 and 323 are made of rigid materials such as metal. The vibration-damping rubber 322 is a vibration-damping member made of elastic rubber and is fixed to the two semi-cylindrical members 321 and 323 by adhesive.

[0023] The sliding surface 31a on the lower surface of the upper base 31, on which the outer circumferential surfaces 321a and 323a of the semi-cylindrical members 321 and 323 can slide, is curved along the outer circumferential surface 321a of the semi-cylindrical members 321 and 323. Similarly, the sliding surface 33a on the upper surface of the lower base 33, on which the outer circumferential surfaces 321a and 323a of the semi-cylindrical members 321 and 323 can slide, is curved along the outer circumferential surfaces 321a and 323a of the semi-cylindrical members 321 and 323.

[0024] The rotary drive device 5 comprises a motor 50, which is the drive source, and a pulley 52 connected to the output shaft 51 of the motor 50. The semi-cylindrical member 321 of the rotating body 32 and the pulley 52 are connected by two shaft members 53 in the axial direction of the output shaft 51. Furthermore, the semi-cylindrical member 323 of the rotating body 32 and the pulley 52 are connected by two shaft members 54 in the axial direction of the output shaft 51. The rotating body 32 is configured to be rotatable by the rotary drive device 5 via the two shaft members 53 and the two shaft members 54.

[0025] Figure 3(a) is a cross-sectional view showing the vibration-damping mount 3 in a vibration-damping state. In the orientation of the rotating body 32 of the vibration-damping mount 3 shown in Figure 3(a), the semi-cylindrical members 321 and 323 face each other in the height direction with the vibration-damping rubber 322 in between, the semi-cylindrical member 321 is in contact with the upper base 31, and the semi-cylindrical member 323 is in contact with the lower base 33. As a result, the vibration-damping mount 3 is in a vibration-damping state in which the vibration-damping rubber 322 functions as a vibration-damping member against vibrations in the height direction.

[0026] Figure 3(b) is a cross-sectional view showing the vibration-damping mount 3 in a fastened state. In the orientation of the rotating body 32 of the vibration-damping mount 3 shown in Figure 3(b), the semi-cylindrical members 321 and 323 face each other in the width direction with the vibration-damping rubber 322 in between, and both the semi-cylindrical members 321 and 323 are in contact with the upper base 31 and the lower base 33. Also, in the orientation of the rotating body 32 shown in Figure 3, the vibration-damping rubber 322 is not in contact with either the upper base 31 or the lower base 33. As a result, the battery pack 2 (bracket 21 of the battery case 20) is supported by the two rigid semi-cylindrical members 321 and 323 of the vibration-damping mount 3, and the vibration-damping rubber 322 does not function as a vibration-damping member against vibrations in the height direction.

[0027] The vibration-damping mount 3 according to Embodiment 1 is configured to allow reversible switching between a vibration-damping state and a fastened state by rotating the rotating body 32. The rotating body 32 is switched between the vibration-damping state and the fastened state depending on the conditions in which vibrations may occur. Specifically, in conditions in which high-frequency vibrations may occur, the rotating body 32 is rotated by the rotary drive device 5 to the position of the rotating body 32 as shown in Figure 3(a), and the vibration-damping mount 3 is put into a vibration-damping state. In conditions in which low-frequency vibrations may occur, the rotating body 32 is rotated by the rotary drive device 5 to the position of the rotating body 32 as shown in Figure 3(b), and the vibration-damping mount 3 is put into a fastened state.

[0028] For example, when a vehicle 1 with a battery pack 2 mounted via the vibration-damping mount 3 is being transported at high speed, and high-frequency vibrations may occur, the vibration-damping mount 3 is set to a vibration-damping state to exert damping force. On the other hand, when a vehicle 1 with a battery pack 2 mounted via the vibration-damping mount 3 is moving under its own power, and low-frequency vibrations may occur, the damping force provided by the vibration-damping rubber 322 is unnecessary, so the vibration-damping mount 3 is fastened to suppress the decrease in the resonant frequency due to the damping force.

[0029] Based on the above, the vibration-damping mount 3, which constitutes the mounting structure of the energy storage device according to Embodiment 1, can appropriately set the vibration resistance performance for the battery pack 2 in both situations where high-frequency vibrations may occur (when high-frequency vibrations are dominant) and situations where low-frequency vibrations may occur (when low-frequency vibrations are dominant).

[0030] (Embodiment 2) The following describes Embodiment 2 of the mounting structure for the energy storage device according to the present invention. In this embodiment, explanations similar to those in Embodiment 1 will be omitted as appropriate.

[0031] Figure 4(a) shows the vibration-damping state of the vibration-damping mount 3A according to Embodiment 2. Figure 4(b) shows the fastening state of the vibration-damping mount 3A according to Embodiment 2. The vibration-damping mount 3A according to Embodiment 2 can irreversibly switch between vibration-damping functions for high-frequency vibrations and vibration-damping functions for low-frequency vibrations.

[0032] The vibration-damping mount 3A according to Embodiment 2 is composed of a displacement member 31A, a plurality of elastic members which are coil springs 32A, and a base member 33A, as shown in Figures 4(a) and 4(b). The displacement member 31A has a fixing portion 310A, an arm portion 311A, and an engaging claw portion 312A. The displacement member 31A is the part to which the bracket 21 connected to the battery case 20 is fixed, and is also a part that can be displaced in accordance with vibrations in the height direction of the battery pack 2. The bracket 21 is placed on the fixing portion 310A of the displacement member 31A, and the bracket 21 and the fixing portion 310A of the displacement member 31A are fastened and fixed together by bolts 41.

[0033] The base member 33A has a trapezoidal cross-section guide portion 331A, a shaft portion 332A, and a base portion 333A. The base portion 333A of the base member 33A is placed on the battery holding frame 11 and fastened and fixed to the battery holding frame 11 by a plurality of bolts 42. The fixing portion 310A of the displacement member 31A and the guide portion 331A of the base member 33A are connected in the height direction by a plurality of coil springs 32A. The vibration-damping mount 3A according to embodiment 2 is configured such that the displacement member 31A can be displaced up and down in the height direction relative to the base member 33A by the elastic deformation of the plurality of coil springs 32A in the height direction.

[0034] Furthermore, the displacement member 31A (especially the arm portion 311A) is made of a material (a material that allows deformation) that expands so that the engaging claw portion 312A catches on the engaging portion 3311A of the base member 33A when the battery pack 2 shakes in the height direction.

[0035] In the vibration-damping mount 3A according to Embodiment 2, when a load is applied to the displacement member 31A in the height direction, the multiple coil springs 32A are compressed, causing the displacement member 31A to sink into the base member 33A. When the engaging claw portion 312A reaches below the lower end of the inclined surface 3310A of the base member 33A in the height direction, the engaging claw portion 312A elastically deforms toward the shaft portion 332A side (inward in the width direction). As a result, the engaging claw portion 312A of the displacement member 31A catches and engages with the engaging portion 3311A (lower end face in the height direction) of the base member 33A, restricting the displacement of the displacement member 31A in the height direction. Furthermore, the multiple coil springs 32A are made of a material such that even if the displacement member 31A is displaced in the height direction due to high-frequency vibration, the engaging claw portion 312A will not catch on the engaging portion 3311A, and the engaging claw portion 312A will only catch on the engaging portion 3311A in the event of an external load input such as a large impact.

[0036] For example, in situations where high-frequency vibrations may occur, such as when a vehicle 1 with a battery pack 2 mounted via a vibration-damping mount 3A is transported at high speed, the displacement of the displacement member 31A by multiple coil springs 32A is allowed to exert a damping force. On the other hand, in situations where low-frequency vibrations may occur, such as when a vehicle 1 with a battery pack 2 mounted via a vibration-damping mount 3A is self-propelled, the damping force from multiple coil springs 32A is unnecessary, so the displacement of the displacement member 31A in the height direction is restricted, suppressing the decrease in the resonant frequency due to the damping force.

[0037] First, under conditions where high-frequency vibrations may occur in the battery pack 2, as shown in Figure 4(a), the engaging claw portion 312A of the displacement member 31A and the engaging portion 3311A of the base member 33A are not engaged, and the displacement member 31A moves (displaces) in the height direction within a predetermined range, and the damping force of the multiple coil springs 32A reduces the high-frequency vibrations.

[0038] Then, due to an external load input to the battery pack 2, a force acts that presses the displacement member 31A toward the base member 33A, causing the multiple coil springs 32A to be compressed and the displacement member 31A to move downward in the height direction (towards the base member 33A), as shown in Figure 4(b). The engaging portion 3311A of the base member 33A and the engaging claw portion 312A of the displacement member 31A then engage, restricting the height displacement of the displacement member 31A relative to the base member 33A. As a result, in situations where low-frequency vibrations may occur, the multiple coil springs 32A of the vibration-damping mount 3A are compressed, reducing the damping force (increasing the resonant frequency).

[0039] Based on the above, the vibration-damping mount 3A constituting the mounting structure of the energy storage device according to Embodiment 2 can appropriately set the vibration resistance performance for the battery pack 2 in conditions where high-frequency vibrations may occur (when high-frequency vibrations are dominant) and in conditions where low-frequency vibrations may occur (when low-frequency vibrations are dominant).

[0040] (Embodiment 3) The following describes Embodiment 3 of the mounting structure for the energy storage device according to the present invention. In this embodiment, explanations similar to those in Embodiment 1 will be omitted as appropriate.

[0041] Figure 5(a) shows the vibration-damping state of the vibration-damping mount 3B according to Embodiment 3. Figure 5(b) shows the fastening state of the vibration-damping mount 3B according to Embodiment 3. The vibration-damping mount 3B according to Embodiment 2 is irreversibly switchable between a vibration-damping function against high-frequency vibrations and a vibration-damping function against low-frequency vibrations.

[0042] The vibration-damping mount 3B according to Embodiment 3 is composed of a displacement member 31B, a plurality of elastic members which are coil springs 32B, and a base member 33B, as shown in Figures 5(a) and 5(b). The displacement member 31B has a fixing portion 310B, an arm portion 311B, and an engaging claw portion 312B. The displacement member 31B is the part to which the bracket 21 connected to the battery case 20 is fixed, and is also a part that can be displaced in accordance with vibrations in the height direction of the battery pack 2. The bracket 21 is placed on the fixing portion 310B of the displacement member 31B, and the bracket 21 and the fixing portion 310B of the displacement member 31B are fastened and fixed together by bolts 41.

[0043] The base member 33B has a rectangular cross-section guide portion 331B, a shaft portion 332B, and a base portion 333B. The base portion 333B of the base member 33B is placed on the battery holding frame 11 and fastened and fixed to the battery holding frame 11 by a plurality of bolts 42. The fixing portion 310B of the displacement member 31B and the guide portion 331B of the base member 33B are connected in the height direction by a plurality of coil springs 32B. The vibration-damping mount 3B according to embodiment 3 is configured such that the displacement member 31B can be displaced up and down in the height direction relative to the base member 33B by the elastic deformation of the plurality of coil springs 32B in the height direction.

[0044] In the vibration-damping mount 3B according to Embodiment 3, when a load is applied to the displacement member 31B in the height direction, the multiple coil springs 32B are compressed, causing the displacement member 31B to sink into the base member 33B. When the engaging claw portion 312B reaches below the lower end of the side surface 3310B of the base member 33B in the height direction, the engaging claw portion 312B elastically deforms toward the shaft portion 332B side (inward in the width direction). As a result, the engaging claw portion 312B of the displacement member 31B catches and engages with the engaging portion 3311B (lower end face in the height direction) of the base member 33B, restricting the displacement of the displacement member 31B in the height direction. Furthermore, the multiple coil springs 32B are made of a material such that even if the displacement member 31B is displaced in the height direction due to high-frequency vibration, the engaging claw portion 312B will not catch on the engaging portion 3311B, and the engaging claw portion 312B will only catch on the engaging portion 3311B in the event of an external load input such as a large impact.

[0045] For example, in situations where high-frequency vibrations may occur, such as when a vehicle 1 with a battery pack 2 mounted via a vibration-damping mount 3B is being transported at high speed, the displacement of the displacement member 31B by multiple coil springs 32B is allowed to exert a damping force. On the other hand, in situations where low-frequency vibrations may occur, such as when a vehicle 1 with a battery pack 2 mounted via a vibration-damping mount 3B is self-propelled, the damping force from the multiple coil springs 32B is unnecessary, so the displacement of the displacement member 31B in the height direction is restricted, suppressing the decrease in the resonant frequency due to the damping force.

[0046] First, under conditions where high-frequency vibrations may occur, as shown in Figure 5(a), the engaging claw portion 312B of the displacement member 31B and the engaging portion 3311B of the base member 33B are not engaged, and the displacement member 31B moves (displaces) in the height direction within a predetermined range, and the damping force of the multiple coil springs 32B reduces the high-frequency vibrations.

[0047] Then, due to an external load input to the battery pack 2, a force acts that presses the displacement member 31B toward the base member 33A, causing the multiple coil springs 32B to compress and the displacement member 31B to move downward in the height direction (towards the base member 33B), as shown in Figure 5(b). The engaging claw portion 312B of the displacement member 31B and the engaging portion 3311B of the base member 33B engage, restricting the height displacement of the displacement member 31B relative to the base member 33B. As a result, in situations where low-frequency vibrations may occur, the multiple coil springs 32B of the vibration-damping mount 3B are compressed, reducing the damping force (increasing the resonant frequency).

[0048] Based on the above, the vibration-damping mount 3B constituting the mounting structure of the energy storage device according to Embodiment 3 can appropriately set the vibration resistance performance for the battery pack 2 in conditions where high-frequency vibrations may occur (when high-frequency vibrations are dominant) and in conditions where low-frequency vibrations may occur (when low-frequency vibrations are dominant).

[0049] (Embodiment 4) The fourth embodiment of the mounting structure for the energy storage device according to the present invention will be described below. In this embodiment, explanations similar to those in the first embodiment will be omitted as appropriate.

[0050] Figure 6(a) shows the vibration-damping state of the vibration-damping mount 3C according to Embodiment 4. Figure 6(b) shows the fastening state of the vibration-damping mount 3C according to Embodiment 4. The vibration-damping mount 3C according to Embodiment 4 is irreversibly switchable between vibration-damping functions for high-frequency vibrations and vibration-damping functions for low-frequency vibrations.

[0051] The vibration-damping mount 3C according to Embodiment 4 is composed of a displacement member 31C, a vibration-damping rubber 32C, and a base member 33C, as shown in Figure 6(a). The displacement member 31C is cylindrical and is the part to which the bracket 21 connected to the battery case 20 is fixed, as well as a part that can be displaced in accordance with vibrations in the height direction of the battery pack 2. The bracket 21 is placed on the displacement member 31C, and the bracket 21 and the displacement member 31C are fastened and fixed together by bolts 41. In addition, the displacement member 31C is provided with an engaging claw portion 341C on the periphery of its lower end surface 311C.

[0052] The base member 33C has a cylindrical portion 331C and a pedestal portion 332C. A displacement member 31C is inserted into the hollow interior of the cylindrical portion 331C. The side surface 310C of the displacement member 31C and the inner circumferential surface 3310C of the cylindrical portion 331C are in contact, and the displacement member 31C is configured to be displaceable in the height direction within the cylindrical portion 331C. The inner circumferential surface 3310C of the cylindrical portion 331C is provided with an engaging portion 351C into which the engaging claw portion 341 of the displacement member 31C can catch and engage. The pedestal portion 332C is placed on the battery holding frame 11 and is fastened and fixed to the battery holding frame 11 by a plurality of bolts 42.

[0053] The vibration-damping rubber 32C connects the displacement member 31C and the base portion 332C of the base member 33B in the height direction. In the vibration-damping mount 3C, the vibration-damping rubber 32C is configured to elastically deform in the height direction, allowing the displacement member 31C to be displaced vertically relative to the base member 33C. The vibration-damping rubber 32C is made of a material such that the engaging claw portion 341C does not catch on the engaging portion 351C even when the displacement member 31C is displaced in the height direction due to high-frequency vibrations, and the engaging claw portion 341C only catches on the engaging portion 351C in the event of an external load input such as a large impact. Examples of materials (types) for the vibration-damping rubber 32C include EPDM, silicone rubber, and butyl rubber.

[0054] For example, in situations where high-frequency vibrations may occur, such as when a vehicle 1 with a battery pack 2 mounted via a vibration-damping mount 3C is transported at high speed, the displacement of the displacement member 31C by the vibration-damping rubber 32C is allowed to exert a damping force. On the other hand, in situations where low-frequency vibrations may occur, such as when a vehicle 1 with a battery pack 2 mounted via a vibration-damping mount 3C is self-propelled, the damping force from the vibration-damping rubber 32C is unnecessary, so the displacement of the displacement member 31C in the height direction is restricted, suppressing the decrease in the resonant frequency due to the damping force.

[0055] First, under conditions where high-frequency vibrations may occur in the battery pack 2, as shown in Figure 6(a), the engaging claw portion 341C of the displacement member 31C and the engaging portion 351C of the base member 33C are not engaged, and the displacement member 31C moves (displaces) in the height direction within a predetermined range, and the damping force of the vibration-damping rubber 32C reduces the high-frequency vibrations.

[0056] Then, due to an external load input to the battery pack 2, a force acts that presses the displacement member 31C against the base member 33C, causing the vibration-damping rubber 32C to compress and the displacement member 31C to sink into the base member 33C, as shown in Figure 6(b). The engaging claw portion 341C of the displacement member 31C then overcomes the engaging portion 351C of the base member 33C, and the engaging claw portion 312A catches on the engaging portion 351C and engages, restricting the displacement of the displacement member 31C in the height direction. Furthermore, after the engaging claw portion 341C of the displacement member 31C and the engaging portion 351C of the base member 33C engage, the vibration-damping rubber 32C is compressed, resulting in a smaller thickness and larger cross-sectional area, which increases the spring constant of the vibration-damping rubber 32C.

[0057] Based on the above, in the vibration-damping mount 3C that constitutes the mounting structure of the energy storage device according to Embodiment 4, the vibration resistance performance for the battery pack 2 can be appropriately set in the case where high-frequency vibrations can occur in the battery pack 2 (when high-frequency vibrations are dominant) and in the case where low-frequency vibrations can occur in the battery pack 2 (when low-frequency vibrations are dominant).

[0058] Furthermore, in the vibration-damping mount 3C according to Embodiment 4, when a load is applied, the vibration-damping rubber 32C is compressed and the displacement member 31C is housed in the base member 33C, and the heat conductive member 6 provided on the battery holding frame 11 comes into contact with the battery pack 2. As a result, in the vibration-damping mount 3C according to Embodiment 4, for example, when the vehicle 1 is running and cooling of the battery pack 2 is required, it is possible to cool the battery pack 2 via the heat conductive member 6, and it is no longer necessary to fix the cooler to the battery case 20.

[0059] (Embodiment 5) The following describes Embodiment 5 of the mounting structure for the energy storage device according to the present invention. In this embodiment, explanations similar to those in Embodiment 1 will be omitted as appropriate.

[0060] Figure 7 is a cross-sectional view showing the schematic configuration of the vibration-damping mount 3D according to Embodiment 5. The vibration-damping mount 3D according to Embodiment 5 allows for the reversible modification of the vibration-damping function of the vibration-damping mount 3D by differentiating the displaceable range of the displacement member 31D between a state in which high-frequency vibrations may occur (when high-frequency vibrations are dominant) and a state in which low-frequency vibrations may occur (when low-frequency vibrations are dominant).

[0061] The vibration-damping mount 3D according to Embodiment 5, as shown in Figure 7, is composed of a displacement member 31D, a pair of vibration-damping rubbers 321D and 322D, and a pair of frames 331D and 332D. The displacement member 31D is the part to which the bracket 21 connected to the battery case 20 is fixed, and is also a part that can be displaced in accordance with vibrations in the height direction of the battery pack 2. The displacement member 31D has a cylindrical shaft portion 311D, an upper projection 312D provided on the upper part of the shaft portion 311D in the height direction, and a lower projection 313D provided on the lower part of the shaft portion 311D in the height direction. The bracket 21 is placed on the shaft portion 311D of the displacement member 31D, and the bracket 21 and the shaft portion 311D are fastened and fixed together by bolts 41.

[0062] The pair of frames 331D and 332D are placed on the battery holding frame 11, sandwiching the displacement member 31D in the width direction, and are fastened and fixed to the battery holding frame 11 by a number of bolts 42 and 43. One end of each of the pair of vibration-damping rubbers 321D and 322D is connected in the height direction between the upper projection 312D and the lower projection 313D on the shaft portion 311D of the displacement member 31D. The other end of each of the pair of vibration-damping rubbers 321D and 322D is connected to the pair of frames 331D and 332D.

[0063] The vibration-damping mount 3D according to Embodiment 5 is configured such that the displacement member 31D can be displaced in the height direction relative to a pair of frames 331D and 332D via a pair of vibration-damping rubbers 321D and 322D. The hardness of the pair of vibration-damping rubbers 321D and 322D should be such that the displacement member 31D can be displaced within a range in which the displacement member 31D can come into contact with the upper projection 312D and the lower projection 313D due to a displacement (vibration) above a certain level in the height direction.

[0064] Under conditions where high-frequency vibrations may occur in the battery pack 2, the displacement of the displacement member 31D in the height direction is small, so the vibration-damping rubbers 321D and 322D are displaced (vibrated) vertically only within the range of arrow A in Figure 7. As a result, the spring constant of the entire vibration-damping mount 3D is reduced, and the resonant frequency can be reduced.

[0065] On the other hand, under conditions where low-frequency vibrations may occur in the battery pack 2, the displacement of the displacement member 31D in the height direction is large, causing the vibration-damping rubbers 321D and 322D to come into contact with the upper projection 312D and the lower projection 313D. As a result, the vibration-damping rubbers 321D and 322D are displaced (vibrate) vertically in the height direction within the range of arrow B in Figure 7, and the spring constant of the entire vibration-damping mount 3D increases, thereby raising the resonant frequency.

[0066] The principle of reducing response through vibration isolation is to expand the vibration isolation area by lowering the resonance point of the vibration isolation member. For high-frequency vibrations, it is effective to set the resonance point on the low-frequency side to widen the vibration isolation area. This is achieved by reducing the spring constant of the entire vibration isolation mount 3D and lowering the resonance frequency. For low-frequency vibrations, the available vibration isolation area becomes smaller, so the increase in response due to resonance of the vibration isolation mount 3D may outweigh the reduction in response due to the vibration isolation effect. Therefore, the increase in response due to resonance is suppressed by raising the resonance frequency of the vibration isolation mount 3D (increasing the spring constant).

[0067] In other words, under conditions where high-frequency vibrations may occur in the battery pack 2, the spring constant of the entire vibration-damping mount 3D is reduced to lower the resonant frequency and expand the vibration-damping effect area. On the other hand, under conditions where low-frequency vibrations may occur in the battery pack 2, the spring constant of the entire vibration-damping mount 3D is increased to raise the resonant frequency and suppress the increase in response due to resonance.

[0068] Based on the above, the vibration-damping mount 3D constituting the mounting structure of the energy storage device according to Embodiment 5 can appropriately set the vibration resistance performance for the battery pack 2 in both the case where high-frequency vibrations can occur in the battery pack 2 (when high-frequency vibrations are dominant) and the case where low-frequency vibrations can occur in the battery pack 2 (when low-frequency vibrations are dominant). [Explanation of Symbols]

[0069] 1 vehicle 2 Battery Packs 3, 3A, 3B, 3C, 3D Vibration-damping mount 5. Rotary drive device 6. Heat conductive material 11. Battery holding frame 20 Battery Cases 21FR, 21FL, 21RR, 21RL Bracket 31 Upper pedestal 31a,33a Sliding surface 31A, 31B, 31C, 31D Displacement members 32. Solids of revolution 32A, 32B Coil Springs 32C, 321D, 322, 322D Vibration-damping rubber 33 Lower pedestal 33A, 33B, 33C Base members 41, 42, 43 bolts 50 motors 51 Output shaft 52 Pulley 53,54 Shaft member 310A,310B Fixed part 310C side 311A, 311B Arm section 311C Lower end surface 311D Shaft 312A, 312B, 341C Engagement claw part 312D upper protrusion 313D lower protrusion 321,323 Semi-cylindrical member 321a,323a Outer surface 331A, 331B Guide section 331C Cylindrical section 331D, 332D Frame 332A,332B Shaft 332C, 333A, 333B Base section 3310A Slope 3310B side 3310C inner surface 351C, 3311A, 3311B Engagement part

Claims

1. A mounting structure for an energy storage device using a vibration-damping mount capable of handling both high-frequency and low-frequency vibrations, The vibration-damping mount is configured to be switchable so that it disables the vibration-damping function corresponding to low-frequency vibrations when high-frequency vibrations may occur, and disables the vibration-damping function for high-frequency vibrations when low-frequency vibrations may occur. The mounting structure for the energy storage device.

2. The vibration-damping mount is capable of reversibly switching between a vibration-damping function against high-frequency vibrations and a vibration-damping function against low-frequency vibrations. Mounting structure for the energy storage device according to claim 1.

3. The vibration-damping mount is capable of irreversibly switching between a vibration-damping function against high-frequency vibrations and a vibration-damping function against low-frequency vibrations. Mounting structure for the energy storage device according to claim 1.

4. The vibration-damping mount is configured to be switchable between a vibration-damping function against high-frequency vibrations and a vibration-damping function against low-frequency vibrations, depending on the external load input to the energy storage device. A mounting structure for an energy storage device according to any one of claims 1 to 3.

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