JP6900337B2 - Vibration device and vehicle vibration reproduction device - Google Patents

Description

The present invention relates to a vibration exciter that applies vehicle-mounted vibration to a battery, and a vehicle vibration reproduction device.

Nickel-metal hydride secondary batteries and lithium-ion secondary batteries are used as in-vehicle power sources for electric vehicles, hybrid vehicles, and the like because of their high energy density. Such an in-vehicle secondary battery is required to withstand the vibration applied from the mounted vehicle during traveling, and Patent Document 1 provides an example of a vibration exciting device capable of applying the same vibration as when the vehicle is traveling. Are listed.

The vibration exciter described in Patent Document 1 includes a vibration table (vibration unit) that independently applies vibration to each wheel of a vehicle (passenger car). The vibration table includes a wheel support member that abuts and supports the outer peripheral surface of the wheel of the vehicle from below, a vertical vibration cylinder that applies vertical vibration to the wheel support member, and diagonally downward front and rear on the outer peripheral surface of the wheel of the vehicle. It includes a front-rear contact member that comes into contact with the front-rear contact member and a front-rear vibration cylinder that applies vibration in the front-rear direction to the front-rear contact member.

Japanese Unexamined Patent Publication No. 2007-147394

According to the technique described in Patent Document 1, vibrations in the vertical direction and the front-rear direction are vibrated on the wheels of the vehicle by the vibration table. Then, for example, by vibrating the vehicle, it is possible to perform a vibration test of the secondary battery mounted on the vehicle.

It is also conceivable that the vibration test of the secondary battery is performed by vibrating only the secondary battery. That is, it is conceivable to vibrate the secondary battery by using a vibration device similar to the vibration device described in Patent Document 1 so as to apply vibration similar to the vibration received from the vehicle to the secondary battery. At this time, in the case of a vehicle, if vibration is applied to the wheels on the movable surface, the same vibration as when the vehicle is running is transmitted to the secondary battery. However, it has been found in the research of the present inventor that when the secondary battery is fastened to the movable surface, the secondary battery may be twisted, which does not occur when the vehicle is running, and the situation when the vehicle is running may not be simulated. It was also found that this twist occurs in various modes depending on the running pattern of the simulated vehicle, making it difficult to apply vibration simulating vehicle running to the secondary battery without using the vehicle. ..

The present invention has been made in view of such circumstances, and an object of the present invention is a vibration device and a vehicle capable of appropriately applying vibration for a vibration test generated by a plurality of vibration tables to a secondary battery. The purpose is to provide a vibration reproduction device.

A vibration device that solves the above problems is hung on a plurality of vibration tables, movable surfaces provided on each of the plurality of vibration tables, and the plurality of movable surfaces, and a secondary battery is fastened. The base jig is provided with a control unit for controlling the movement of the movable surface of the vibration table, and the base jig is provided on each of the base portion to which the secondary battery is fastened and the plurality of movable surfaces. On the other hand, the leg portion extends from the base portion so as to come into contact with the movable surface, and the leg portion has a tip that is an end portion on a side away from the base end connected to the base portion. The rigidity of the portion of the leg portion between the tip end and the base end, which is fixed to the movable surface that comes into contact with the leg portion, is set to be lower than the rigidity of the base portion sandwiched between the leg portions.

A vehicle vibration reproduction device that solves the above problems is hung on a plurality of vibration tables, movable surfaces provided on each of the plurality of vibration tables, and the plurality of movable surfaces, and a secondary battery is fastened. The base jig is provided with a control unit that controls the movement of the movable surface of the vibration table so that vibration corresponding to the vibration of the vehicle is applied to the secondary battery. It has a base portion to which a secondary battery is fastened, and a leg portion extending from the base portion so as to abut the movable surface with respect to each of the plurality of movable surfaces. The tip, which is the end on the side away from the base end connected to the base portion, is fixed to the movable surface to which the tip abuts, and the rigidity of the portion between the tip and the base end of the leg portion is the leg portion. It is set lower than the rigidity of the base portion sandwiched between the two.

The present inventors have discovered that the following twists are one of the causes of various twists that occur in a secondary battery fixed to a movable surface of a vibration table, and under specific conditions, in particular. It was found to have a great impact. That is, the movable surface of the vibration table is maintained horizontally with respect to the vertical direction, but the secondary battery fixed to the plurality of vibration tables is generated between the plurality of movable surfaces in addition to the vibration. Twisting occurs due to the height difference.

In this respect, according to this configuration, even if a plurality of steps on the movable surface occur, the leg portion having a lower rigidity than the base portion is elastically deformed in the base jig. As a result, it is possible to prevent the base portion from being twisted due to the step on the movable surface. Therefore, even if the secondary battery is fastened to the base portion, the vibration from the vibration table is transmitted, while the application of twist due to the step on the movable surface of the vibration table is suppressed.

In addition, the base jig maintains appropriate rigidity because the legs are extended to the base, and it is possible to appropriately transmit vibrations at a frequency suitable for vibration tests such as vibrations generated during in-vehicle use. You will also be able to do it.

Therefore, the vibration for the vibration test generated by the plurality of vibration tables can be appropriately applied to the secondary battery.
As a preferred configuration, the base jig includes the base portion and the leg portion integrally.

According to such a configuration, the base portion and the leg portion are integrally formed, so that the handling is easy. Further, if the base portion and the leg portion are made of the same material, the production is easy. For example, if the base jig is metal, the base jig can be manufactured by bending or welding. Even if the same material is used, the rigidity of the legs can be relatively reduced depending on the thickness, length, and structure of the material.

As a preferable configuration, in the base jig, the base portion and the leg portion are composed of separate parts.
According to such a configuration, since the base portion and the leg portion are composed of separate parts, it becomes easy to make the rigidity set for the base portion and the leg portion different. For example, by using metal for the base and resin for the legs, the rigidity of the legs can be set to be relatively low with respect to the base.

As a preferred configuration, the base portion is composed of a frame body and a crosspiece member provided on the frame body.
According to such a configuration, the rigidity of the frame body can be increased by providing the crosspiece member on the frame body. Therefore, the rigidity of the base portion can be increased relative to the leg portion.

As a preferred configuration, the secondary battery is fastened to the crosspiece member.
According to such a configuration, when the secondary battery is fastened to the crosspiece member of the frame body with increased rigidity, the secondary battery may be distorted due to the step on the movable surface of the vibration table. Can be reduced.

As a preferable configuration, the base portion includes a spacer for fastening the secondary battery to at least one of the fastening portions to the vehicle body.
According to such a configuration, the secondary battery can be fixed to the vibration exciter in a state similar to the fastened state in the vehicle.

As a preferred configuration, the secondary battery is subjected to vibration having a frequency of 20 Hz or less.
Vibrations with a frequency of 20 Hz or less cause a large twist in the secondary battery due to the height difference generated between the plurality of movable surfaces. In this respect, according to this configuration, the secondary battery is subjected to vibration of 20 Hz or less from the vibration exciter, but the occurrence of twisting that is particularly large due to the vibration of 20 Hz or less is suppressed. For example, vibrations having a frequency of 0 Hz or higher and 20 Hz or lower are frequencies input from a road surface having irregular irregularities. Therefore, vibrations in this frequency range are transmitted and twisting is suppressed, thereby suppressing the occurrence of twists in the vehicle. Increased vibration reproducibility. Such a frequency range occurs, for example, on a cobblestone road surface, and it is highly necessary to evaluate the effect on the secondary battery.

As a preferred configuration, an acceleration sensor is installed at the fastening portion of the secondary battery, and the control device controls the movement of the movable surface based on the acceleration detected by the acceleration sensor.
According to such a configuration, it is possible to apply the desired vibration to the secondary battery while reducing the influence of the vibration change due to the vibration transmission characteristic of the base jig.

According to the present invention, it is possible to appropriately apply vibration for a vibration test generated by a plurality of vibration tables to a secondary battery.

The schematic diagram which shows the schematic structure about one Embodiment of a vibration exciter. The perspective view which shows the structure of the base jig in the same embodiment. The schematic diagram which shows the example of the vibration reproduced by the vibration exciter in the same embodiment. In the same embodiment, the figure which shows the running state of the vehicle reproduced by the vibration exciter, and the frequency distribution of the vibration generated in the running state. The schematic diagram which shows the relationship between a vibration table and a base jig in the same embodiment. The schematic diagram which shows the relationship between a vibration table and a base jig in the same embodiment. The schematic diagram which shows an example when the rigidity of the whole base jig is the same. A graph showing the relationship between the rigidity of the entire base jig and the magnitude of strain.

An embodiment of the vibration exciter and the vehicle vibration reproduction device will be described with reference to FIGS. 1 to 8. With reference to FIG. 1, the vibration exciter 10 is a device mounted on an electric vehicle or a hybrid vehicle and used for a vibration test of a secondary battery 40 (see FIG. 2) that supplies electric power to an electric motor or the like. The vibration exciter 10 reproduces the vibration applied to the secondary battery 40 mounted (vehicle-mounted) on the vehicle 100 (see FIG. 3) and applies the vibration to the secondary battery 40.

The secondary battery 40 shown in FIG. 2 is a so-called battery pack, and is an assembled battery (not shown) composed of a plurality of battery modules (not shown) closely stacked in the thickness direction in the internal space of the outer housing 41. (Omitted) is housed. The battery module is a rectangular parallelepiped sealed battery, which is a nickel-metal hydride secondary battery or a lithium ion secondary battery.

As shown in FIG. 1, the vibrating device 10 includes a vibrating unit 11 and a control device 12. The vibration unit 11 applies vibration to the secondary battery 40 via the base jigs 30 spanned by the four vibration tables 20. The control device 12 controls the operations of the plurality of exciting tables 20 so as to coordinate with each other so that the vibration corresponding to the vibration of the vehicle 100 is applied to the secondary battery 40.

The vibrating unit 11 reproduces the vibration input from the four points of the road surface GL (see FIG. 4) by the four-wheeled vehicle 100 (see FIG. 3) by coordinating the four vibrating tables 20. Since each of the four vibrating tables 20 has the same configuration, one of them will be described below for convenience of explanation. Since the four vibration tables 20 correspond to the four wheels 110 (see FIG. 3) of "front left", "front right", "rear left", and "rear right", each input is made. When it is necessary to distinguish the positions, the reference numerals are given to the "left front" vibration table 201, the "right front" vibration table 202, the "left rear" vibration table 203, and the "right rear" vibration table 204. Will be explained with. That is, in FIG. 1, the lower part of the paper corresponds to "front", the upper part of the paper corresponds to "rear", the left side of the paper corresponds to "left", and the right side of the paper corresponds to "right".

The vibration table 20 is a three-axis vibration device that can move in three directions while maintaining the horizontality of the movable surface 21 on which the object is placed. The three directions are the front-rear direction, the left-right direction orthogonal to the front-rear direction, and the up-down direction orthogonal to the left-right direction and the front-rear direction. The horizontal is a plane orthogonal to the vertical direction, and is a plane including the front-back direction and the left-right direction. The vibration table 20 includes a front-rear drive device 22 that moves the movable surface 21 in the front-rear direction, a left-right drive device 23 that moves the movable surface 21 in the left-right direction, and a vertical drive device 24 that moves the movable surface 21 in the up-down direction. It has. Further, the horizontality of the movable surface 21 is mechanically maintained. The front-rear drive device 22, the left-right drive device 23, and the up-down drive device 24 are electric motors with a motor drive device (motor driver), and are based on instructions from the control device 12 for forward rotation, reverse rotation, or stop. The rotation shaft is driven, and the rotation of the rotation shaft is converted into a linear motion in the corresponding direction to move the movable surface 21. The vibrating table 20 is supported by a skeleton portion fixed to the floor surface, so that the movable surface 21 moves relative to the floor surface. Further, the four vibration tables 20 have their relative positional relationships fixed by fixing their skeleton portions to the floor surface, while the relative positional relationships of the four movable surfaces 21 are movable. It can be changed according to the movement of the surface 21.

The control device 12 includes a vibration calculation unit 121 that calculates the vibration generated in the vibration table 20, and a vibration data holding unit 124 that holds the vibration data 125.
Further, the control device 12 is connected to each of the four vibration tables 20 by signal lines 141, 142, 143, 144. Each signal line 141, 142, 143, 144 is a signal line that transmits a signal to each drive device 22, 23, 24, respectively. The control device 12 includes a signal output unit 123 that outputs forward rotation, reverse rotation, and stop signals via each signal line to the drive devices 22, 23, and 24, which are signal transmission destinations, including the rotation speed.

The control device 12 is connected to four acceleration sensors 131 to 134 by signal lines, respectively. The control device 12 includes an acceleration acquisition unit 122 that acquires the acceleration detected by each acceleration sensor 131 to 134 to which each signal line is connected via each signal line. The acceleration sensors 131 to 134 are three-axis acceleration sensors capable of detecting acceleration in three directions of the X-axis, the Y-axis, and the Z-axis. The acceleration acquisition unit 122 can acquire accelerations in three directions from each acceleration sensor 131 to 134, and can calculate "pitch", "yaw", and "roll". Further, the acceleration acquisition unit 122 calculates the acceleration in three directions and the "pitch", "yaw", and "roll" at a specific position such as the position of the center of gravity of the secondary battery 40 based on the acquired accelerations at the four points. You may.

The control device 12 includes a microprocessor, and includes an arithmetic unit and a storage unit. The control device 12 exerts a predetermined function by arithmetically processing the program stored in the storage unit by the arithmetic unit. For example, the control device 12 exerts the function of the vibration calculation unit 121 based on the arithmetic processing of the vibration calculation program.

Further, the storage unit is provided with the vibration data holding unit 124 described above, and the vibration data 125 is stored in the vibration data holding unit 124. The vibration data 125 is data corresponding to vibration suitable for the vibration test of the secondary battery 40. The vibration data 125 is, for example, data generated based on the vibration measured by the vehicle 100 or data created so as to correspond to the vehicle vibration. Here, the vibration data 125 is composed of acceleration data, but may be composed of other data as long as the vibration can be reproduced.

The vibration calculation unit 121 calculates the amount of movement of the movable surfaces 21 of the four vibration tables 20 so as to reproduce the vibration data 125 held in the vibration data holding unit 124. More specifically, the vibration calculation unit 121 acquires or generates movement data corresponding to each vibration table 20 from the vibration data 125, and from the movement data of one vibration table 20, in the front-rear direction, the left-right direction, and the up-down direction. Acquire or generate directional data. Then, the control device 12 drives and controls the drive devices 22, 23, 24 based on the direction-specific data corresponding to the drive devices 22, 23, 24.

Further, the vibration calculation unit 121 compares the vibration data based on the acceleration acquired by the acceleration acquisition unit 122 with the vibration data 125 stored in the vibration data holding unit 124, and commands the four vibration tables 20. So-called feedback control that corrects the value can be performed. The vibrating device 10 performs feedback control based on the acceleration acquired from the acceleration sensors 131 to 134 attached to the secondary battery 40 or the base jig 30, thereby performing the vibrating base 20, the base jig 30, and the secondary. The desired vibration can be applied to the secondary battery 40 while reducing the influence of the response characteristics of the battery 40. When the input is four points, it is preferable to use the same number of acceleration sensors 131 to 134. That is, the movement of the movable surface 21 is controlled based on the acceleration detected by the acceleration sensors 131 to 134. It is preferable that these acceleration sensors 131 to 134 are provided at positions where the secondary battery 40 is fastened to the base jig 30.

The vibration calculation unit 121 converts the movement amount based on the calculated direction-specific data into a command value such as a rotation speed, and outputs the signal output unit 123 to the corresponding drive devices 22, 23, 24 of the corresponding vibration table 20. .. The direction-specific data may be, for example, data including frequency and amplitude, velocity information for each sample time, or position information for each sample time.

The base jig 30 will be described with reference to FIG.
The base jig 30 includes a frame portion 31 as a rectangular frame-shaped frame body, and leg portions 32 extending from each corner portion of the frame portion 31. That is, in the base jig 30, the frame portion 31 and the four leg portions 32 are integrally formed.

The frame portion 31 is formed by combining hollow square lumber made of an iron material having a plate thickness of 1.5 mm or more and 5 mm or less. The frame portion 31 is formed in a rectangular shape by combining two vertical members 30a and 30b made of square cylinders extending in the longitudinal direction and two horizontal members 30c and 30d made of square cylinders extending in the longitudinal direction so as to be orthogonal to each other. Has been done. The frame portion 31 is formed by welding vertical members 30a and 30b arranged in parallel in the left-right direction and horizontal members 30c and 30d arranged in parallel in the front-rear direction. The rigidity of the frame portion 31 is ensured by welding orthogonal square cylinders. The base jig 30 of the present embodiment has a rectangular shape in which the length of one side of the frame portion 31 is 700 mm or more and 1500 mm or less.

The frame portion 31 is hung on the two vertical members 30a and 30b at a position sandwiched between the horizontal members 30c and 30d in the middle of each of the vertical members 30a and 30b in the longitudinal direction, and is hung on the horizontal members 30c and 30d. The front crosspiece 361 and the rear crosspiece 362 as a spacer are fixed so as to be parallel to each other. Each of the two crosspiece members 361 and 362 has the same length as the width of the frame portion 31 in the left-right direction, and the side surfaces of the end portions in the left-right direction are overlapped with the side surfaces of the vertical members 30a and 30b, respectively. The overlapped part is welded. The base portion is composed of the frame portion 31 and the two crosspiece members 361 and 362.

The crosspiece member 361 on the front side is a metal square tube, and both ends of the square tube in the longitudinal direction are welded to the vertical members 30a and 30b, respectively. The crosspiece member 361 on the front side reproduces the fixing member of the secondary battery 40 in the vehicle 100. The fastening portions 42L and 42R provided on the lower front side of the secondary battery 40 are fixed to the frame portion 31 via the crosspiece member 361 on the front side. The front crosspiece member 361 has a fastening screw hole formed on the upper surface of the welded height adjusting members 36a and 36b. The fastening portions 42R and 42L of the secondary battery 40 are fastened to the height adjusting members 36a and 36b by screwing bolts into the fastening screw holes.

The rear crosspiece member 362 is a metal box-shaped member whose left-right direction is the longitudinal direction, and both ends of the box in the longitudinal direction are welded to the vertical members 30a and 30b, respectively. Further, in the rear crosspiece member 362, the lower rear portion of the box is welded to the horizontal member 30d. The crosspiece member 362 on the rear side reproduces the fixing member of the secondary battery 40 in the vehicle 100. The fastening portions 43L, 43C, 43R provided on the rear upper side of the secondary battery 40 are members that are fixed to the frame portion 31 via the crosspiece member 362 on the rear side. A screw hole for fastening is formed on the upper surface 37 of the crosspiece member 362 on the rear side. The fastening portions 43L, 43C, 43R of the secondary battery 40 are fastened to the upper surface 37 by screwing bolts into the fastening screw holes.

Accelerometers 131 to 134 are provided at or near the fastening portions 42L, 42R, 43L, 43R to which the secondary battery 40 is fastened to the crosspiece members 361 and 362. As a result, the vibration input to the secondary battery 40 is suitably measured by the acceleration sensors 131 to 134.

Therefore, the frame portion 31 has a rectangular shape composed of two vertical members 30a and 30b and two front and rear horizontal members 30c and 30d, and further two crosspiece members 361 and 362 are connected to the frame portion 31 so that the frame portion 31 has rigidity. Is kept higher.

The leg portion 32 is made of a metal square cylinder, and extends in a direction away from each corner portion of the frame portion 31 or a portion in the vicinity thereof to the frame portion 31. Specifically, the leg portion 32 is made of a hollow square lumber made of an iron material having a plate thickness of 1.5 mm or more and 5 mm or less. The front and rear extending portions of the vertical members 30a and 30b are the leg portions 32, respectively. That is, the portion extended to the front side of the right vertical member 30a is the right front leg portion 32 (322), and the portion extended to the rear side is the right rear leg portion 32 (324). Further, the portion extended to the front side of the left vertical member 30b is the left front leg portion 32 (321), and the portion extended to the rear side is the left rear leg portion 32 (323). Then, the right front leg 32 (322) is fixed to the "right front" vibration table 202, the right rear leg 32 (324) is fixed to the "right rear" vibration table 204, and the left front leg The 32 (321) is fixed to the "left front" vibration table 201, and the left rear leg 32 (323) is fixed to the "left rear" vibration table 203.

The leg portion 32 separates the tip end 32b from the frame portion 31 between the base end 32a connected to the frame portion 31, the tip end 32b fastened to the movable surface 21, and the base end 32a and the tip end 32b. It is provided with an extension portion 32c that allows contact with the movable surface 21. In the present embodiment, each leg portion 32 of the base jig 30 is a longitudinal member having a length from the base end 32a to the tip end 32b of the leg portion 32 of 150 mm or more and 300 mm or less.

The base end 32a is a portion where the leg portion 32 is connected to the vertical members 30a and 30b. The leg portion 32 is bent at an appropriate angle at the position of the base end 32a or a position in the vicinity thereof in order to arrange the tip end 32b at an appropriate position on the movable surface 21. The bent angle is an angle at which the distance between the two tips 32b on the front side and the distance between the two tips 32b on the rear side are wider than the distance between the vertical members 30a and 30b. If the tip 32b can be arranged at an appropriate position on the movable surface 21, the bending angle may be 0 degrees, and the distance between the two tips 32b is larger than the distance between the vertical members 30a and 30b. It may be a narrowing angle.

In the present embodiment, the leg portion 32 is a portion in which the vertical members 30a and 30b are extended in the front direction and the rear direction, respectively, so that the connection strength with the frame portion 31 is maintained high. Further, the rigidity of the base end 32a adjacent to the frame portion 31 and its vicinity is maintained high.

The tip 32b is configured to be fastened to the movable surface 21. The tip 32b has a flange 32f around the end. For example, the tip 32b may have the flange 32f fixed to the movable surface 21 with a bolt or the like, or the flange 32f may be sandwiched between the movable surface 21 and the fixture fixed to the movable surface 21. The tip 32b is fixed to the movable surface 21 with a strength capable of following the movement of the movable surface 21 while deforming the base jig 30 when the movable surface 21 moves.

The extension portion 32c has a predetermined length and separates the tip end 32b from the base end 32a. The extension portion 32c can be elastically deformed at its predetermined length. Since the frame portion 31 is a frame body with a crosspiece, the extension portion 32c is composed of one square cylinder, and therefore has relatively low rigidity in the base jig 30. Therefore, when a twisting force is applied to the base jig 30, the extension portion 32c is elastically deformed according to the twisting force, while the deformation of the frame portion 31 maintained to be higher in rigidity than the extension portion 32c is suppressed. Will be done. By increasing the predetermined length of the extension portion 32c, the relative decrease in rigidity with respect to the frame portion 31 may be increased, or conversely, by shortening the extension portion 32c, the relative decrease in rigidity with respect to the frame portion 31 may be increased. It can be reduced. That is, the rigidity set in the extension portion 32c can be adjusted by changing the predetermined length.

The extension portion 32c includes a portion 32d extending horizontally from the base end 32a and a rising portion 32e protruding from the tip end side of the extending portion 32d in the direction of the movable surface 21 and having the tip end 32b provided. The rising portion 32e is provided so as to project in the vertical direction substantially orthogonal to the direction of the movable surface 21 with respect to the portion 32d extending in the horizontal direction.

That is, the extension portion 32c absorbs the twist generated in the base jig 30 due to the step of the vibration table 20 by the deformation of the portion 32d extending in the horizontal direction and the riser portion 32e, and suppresses the deformation of the frame portion 31. Let me. For example, the portion 32d extending in the horizontal direction is deformed so that the portion away from the base end 32a moves in the vertical direction or the horizontal direction with respect to the horizontal direction. It elastically deforms as the distance increases. Further, the rising portion 32e absorbs a change in the interval generated in the horizontal direction of each leg portion 32 by tilting the portion away from the movable surface 21 in the front-rear direction and the left-right direction with respect to the vertical direction, or extends in the horizontal direction. It follows the bend of the portion 32d.

In such a base jig 30, a force is applied so that the plurality of legs 32 and the frame 31 arranged between them are in contact with the vibration table 20. At this time, the magnitude of the twist of the leg portion 32 and the base portion including the frame portion 31 is compared as the rigidity. That is, if the twist is large, the rigidity is low, and if the twist is small, the rigidity is high. Here, the rigidity of the base portion of the base jig 30 exists, for example, between two adjacent legs 32 of the base jig 30, and all the members that generate the rigidity as the base jig 30. Specifically, it is the rigidity of the vertical member 30a, the vertical member 30b, the horizontal member 30c, and the horizontal member 30d + the crosspiece member 362. For example, if all of the vertical member 30a, the vertical member 30b, the horizontal member 30c, and the horizontal member 30d + the crosspiece member 362 has a smaller twist than the leg portion 32, it can be said that the base portion has higher rigidity than the leg portion 32.

With reference to FIGS. 3 and 4, the vibration for the vibration test that the vibration exciter 10 applies to the secondary battery 40 will be described.
As shown in FIG. 3, the traveling vehicle 100 uses the four wheels 110 in contact with the road surface GL (see FIG. 4) as input points, and the road surface GL (see FIG. 4) is input via these four wheels 110. Is applied to the floor surface 120 of the vehicle body. Therefore, the vibration device 10 provided with the four vibration tables 20 is suitable for generating the same vibration as the traveling vehicle 100.

For example, the traveling vehicle 100 is subjected to vibration in the vertical direction based on the front-back vibration in which the front portion 101 of the vehicle body is relatively above or below the rear portion 102 of the vehicle body. Further, a vibration in the vertical direction is applied to the traveling vehicle 100 based on a left-right swing in which the left side of the vehicle body is relatively above or below the right side of the vehicle body. Such vibration is also applied to the secondary battery 40 fastened to the floor surface 120 of the vehicle 100. Therefore, in the vibration test of the secondary battery 40, the vibration device 10 is set to have the same vibration as the above-mentioned vibration as the vibration data 125, and controls the vibration of the vibration table 20 based on the set vibration data 125. This causes vibration to be applied to the secondary battery 40.

The vibration data 125 set in the vibration exciter 10 will be described with reference to FIG. The vibration data 125 of the vibration exciter 10 is data generated based on the acceleration applied from the floor surface 120 to the secondary battery 40 in the vehicle 100 traveling on the road surface GL, which is input from the wheels 110 of the vehicle 100. .. The road surface GL is intended for a road surface having many fine irregularities. Examples of the road surface GL having many fine irregularities include a cobblestone road surface, an unpaved road surface, and a road surface with deteriorated pavement. Although there is a mechanical spring characteristic between the wheel 110 and the floor surface 120 of the vehicle 100 and between the floor surface 120 and the secondary battery 40, the road surface GL having fine irregularities is changed to the secondary battery 40. As shown in graph L1 of FIG. 4, vibration having a high input acceleration is transmitted in a frequency range having a frequency of 0 Hz or more and 20 Hz or less. That is, as the vibration for the vibration test of the secondary battery 40, a vibration having a frequency of 20 Hz or less and a high input acceleration is preferable. Therefore, as the vibration data 125, data capable of giving vibration as shown in the graph L1 to the secondary battery 40 is set. Further, the vibration of the vehicle 100 tends to have a higher input acceleration because the amplitude is larger as the frequency is lower. Further, since the amplitude is large, the height difference between the adjacent vibration tables 20 in the plurality of vibration tables 20 tends to be large, and the inclination of the secondary battery 40 tends to be large. For example, the maximum value of the amplitude is about 20 mm, and the inclination of the secondary battery 40 is set to be about 1 degree at the maximum.

That is, it is preferable that the base jig 30 has a structure in which the twist of the frame portion 31 can be suppressed to a small extent. In this respect, the base jig 30 of the present embodiment can be configured to suppress the occurrence of twist while transmitting vibration having a frequency of 0 Hz or higher and 20 Hz or lower. At least, the base jig 30 has the above-mentioned preferable configuration when the conditions of the frame portion 31 and the leg portion 32 are as follows. That is, one example of the condition is a rectangular shape in which the length of one side of the frame portion 31 is 700 mm or more and 1500 mm or less, and the length from the base end 32a to the tip end 32b of the leg portion 32 is 150 mm or more and 300 mm. Below, the frame portion 31 and the leg portion 32 are made of a hollow square lumber made of an iron material having a plate thickness of 1.5 mm or more and 5 mm or less.

(Action)
The operation of the base jig 30 when vibration is applied from the vibration table 20 will be described with reference to FIGS. 5 and 6.

FIG. 5 shows the movable surface 21 of the vibration table 20 which is maintained at the same height because it does not vibrate. FIG. 6 shows a movable surface 21 of the vibration table 20 whose height differs due to vibration. Although there are four vibration tables 20, for convenience of explanation, two vibration tables 20 (movable surface 21) when viewed from the right side will be described as an example.

As shown in FIG. 5, when the movable surfaces 21 of the vibration table 202 on the front right and the vibration table 204 on the right rear are at the same height, the leg portion 322 on the right front and the leg on the right rear of the base jig 30. The portion 324 comes into contact with the corresponding movable surface 21 without elastic deformation. Further, each leg portion 32 of the base jig 30 is fastened to the corresponding movable surface 21 when the movable surface 21 of each vibration table 20 is included in the same plane. At this time, each leg 32 is in a no-load state. In the so-called no-load state, each leg portion 32 of the base jig 30 is attached to the frame portion 31 so as to be arranged on the same plane. Further, since each leg portion 32 has no load, the frame portion 31 is not twisted, and the secondary battery 40 to which the fastening portions 42L, 42R, 43L, 43C, 43R are fastened to the frame portion 31 is present. However, there is no distortion.

FIG. 6 shows a state when the base jig 30 and the secondary battery 40 attached to the vibration table 20 are vibrated by the vibration table 20.
Since the vibration table 20 is a three-axis vibrating device, the movable surface 21 moves in the front-rear direction, the left-right direction, and the up-down direction while maintaining the posture with respect to the horizontal direction. At this time, since the distance between the portions where the legs 32 of the two movable surfaces 21 are fixed changes, the base jig 30 absorbs the change in the distance. Elastic deformation occurs in the extension portion 32c between the tip 32b and the tip 32b, which is set to have a lower rigidity than the frame portion 31. For example, when the distance between the two vibration tables 20 changes due to the movement in the front-rear direction or the left-right direction, the relative angle of the two rising portions 32e changes or bends to absorb the change in the distance. Further, when a step is generated in the vibration table 20 in the vertical direction, the twist due to the step is absorbed by the bending of the rising portion 32e and the like, and the tension generated in the vertical direction causes the standing. The raised portion 32e and the horizontally extending portion 32d are absorbed by bending in the direction in which tension is applied. On the other hand, such deformation of the leg portion 32 minimizes twisting of the frame portion 31.

For example, as shown in FIG. 6, when the vibration table 204 at the rear right is relatively lower than the vibration table 202 at the front right, the frame portion 31 is excited by the vibration table 202 at the front right at the rear right. It is tilted so that it is higher than the shaking table 204 side. On the other hand, the tip 32b of the right front leg 322 and the tip 32b of the right rear leg 324 fastened to the movable surface 21 maintain their relative positions with respect to the fastened movable surface 21. Therefore, in the base jig 30, the frame portion 31 is tilted with respect to the tip end 32b of the right front leg portion 322 and the tip end 32b of the right rear leg portion 324 that are maintained horizontal. Therefore, with respect to the horizontal direction, the length of the frame portion 31 is in the horizontal direction with respect to the distance between the tip 32b of the right front leg portion 322 and the tip 32b of the right rear leg portion 324 in which a constant length is maintained. Tension is generated between the two legs 322 and 324 because the component of is shortened. Then, the generated tension is absorbed by the elastic deformation of the leg portion 32, which is set to have a lower rigidity than the frame portion 31. Further, in the vertical direction, a step is formed between the tip 32b of the right front leg 322 and the tip 32b of the right rear leg 324, which are at the same position, and the vertical direction between the two tips 32b. Tension is generated because the distance is increased due to the interval. Then, the generated tension is absorbed by the elastic deformation of the leg portion 32, which is set to have a lower rigidity than the frame portion 31.

In this way, even if the vibration table 20 vibrates, the twist of the frame portion 31 is minimized. Therefore, the secondary battery 40 in which the fastening portions 42L, 42R, 43L, 43C, 43R are fastened to the frame portion 31. Even if there is, the occurrence of distortion due to the twist of the base jig 30 is suppressed. Further, while the occurrence of distortion is suppressed, the leg portion 32 can move at substantially the same speed and acceleration as the movable surface 21, and the amount of elastic deformation of the leg portion 32 is not so large. The base jig 30 can appropriately transmit the test vibration applied from the vibration table 20 to the secondary battery 40.

FIG. 7 describes an example of the base jig 130 that does not have the leg portion 32 having low rigidity.
With reference to FIG. 7, the base jig 130 is made of, for example, a metal plate and has the same rigidity as a whole. The base jig 130 has fixing portions 320 and 340 fixed to the vibration table 20 before and after the mounting portion 310 on which the secondary battery 40 is mounted. Since the base jig 130 has the same rigidity as a whole, the fixing portions 320 and 340 reinforced by the vibration table 20 are hard to be deformed, and the unreinforced mounting portion 310 is easily deformed. Therefore, in such a base jig 130, when the height of the vibration table 204 on the right rear is relatively low with respect to the vibration table 202 on the right front, the fixing portion 320, in order to cope with this step (height difference), The mounting portion 310, which is more easily deformed than the 340, is twisted and elastically deformed. Since the secondary battery 40 to be vibrated is fastened to the mounting portion 310, the deformation generated in the mounting portion 310 is applied to the secondary battery 40, causing distortion in the secondary battery 40. .. That is, the secondary battery 40 is not only vibrated by the vibrating table 20, but also a large strain due to the deformation of the base jig 130 is applied. Therefore, in the vibration test using the base jig 130, a mechanical strain other than the vibration for the test is applied to the secondary battery 40, and there is a concern that this strain affects the vibration test.

With reference to FIG. 8, the strain applied from the base jig 30 to the secondary battery 40 will be described. In each graph of FIG. 8, it is assumed that the length of the secondary battery 40 in the longitudinal direction is 700 mm, the maximum value of the inclination is 1 degree, and the height difference of the adjacent vibration table 20 is 10 mm or less. An example is shown. FIG. 8 shows the strain applied to the secondary battery 40, the graph L51 is the strain applied to the mounted secondary battery 40, and the graph L52 is attached to the base jig 30 of the present embodiment. The strain applied to the secondary battery 40 and the graph L53 show the magnitude of the strain applied to the secondary battery 40 attached to the conventional base jig 130. For example, since the on-board secondary battery 40 vibrates together with the floor surface 120 of the vehicle 100, the occurrence of distortion other than vibration is small. On the other hand, in the conventional base jig 130, a large strain is applied to the secondary battery 40 mounted on the mounting portion 310 which is greatly twisted at a low frequency having a large amplitude. On the other hand, in the base jig 30 of the present embodiment, the leg portion 32 is greatly elastically deformed at a low frequency having a large amplitude, while the twist of the frame portion 31 is suppressed to be small, so that the base jig 30 is fastened to the frame portion 31. The magnitude of the strain applied to the next battery 40 is suppressed.

As described above, according to the vibration exciter and the vehicle vibration reproduction device of the present embodiment, the effects described below can be obtained.
(1) Even if a step is generated on the movable surfaces 21 of the plurality of vibration tables 20, the leg portion 32 having a lower rigidity than the frame portion 31 is elastically deformed in the base jig 30. As a result, it is possible to prevent the frame portion 31 from being twisted due to the step difference of the movable surface 21. Therefore, even in the secondary battery 40 fastened to the frame portion 31, the vibration from the vibration table 20 is transmitted, while the application of twist due to the step on the movable surface 21 of the vibration table 20 is suppressed. Become so.

Further, the base jig 30 maintains appropriate rigidity because the legs 32 are extended to the frame portion 31, and appropriately transmits vibrations having a frequency suitable for a vibration test such as vibrations generated during in-vehicle use. You will also be able to make it.

Therefore, the vibration for the vibration test generated by the plurality of vibration tables can be appropriately applied to the secondary battery 40.
(2) Since the frame portion 31 and the leg portion 32 are integrally formed, handling is easy. Further, if the frame portion 31 and the leg portion 32 are made of the same material such as metal, the production is easy. For example, if the base jig 30 is made of metal, the base jig 30 can be manufactured by bending or welding. Even if the same material is used, the rigidity of the legs can be relatively reduced depending on the thickness, length, and structure of the material.

(3) The rigidity of the frame portion 31 can be increased by providing the frame portion 31 with two crosspiece members 361 and 362. Therefore, the rigidity of the base portion including the frame portion 31 can be increased relative to the leg portion 32.

(4) By fastening the secondary battery 40 to the crosspieces 361 and 362 of the frame portion 31 having increased rigidity, distortion caused by the step of the movable surface 21 of the vibration table 20 is applied to the secondary battery 40. It is possible to reduce the risk of being damaged.

(5) The secondary battery 40 can be fixed to the vibrating device 10 via the crosspiece members 361 and 362 in the same state as in the fastened state in the vehicle 100.
(6) The secondary battery 40 is subjected to vibration of 20 Hz or less from the vibrating device 10, but the occurrence of twisting that is particularly large due to the vibration of 20 Hz or less is suppressed. For example, vibration having a frequency of 0 Hz or more and 20 Hz or less is a frequency input from a road surface GL having irregular irregularities. Therefore, vibration in this frequency range is transmitted and twisting is suppressed. The reproducibility of vehicle vibration is improved. Such a frequency range occurs, for example, on a cobblestone road surface, and it is highly necessary to evaluate the effect on the secondary battery.

(7) The desired vibration can be applied to the secondary battery 40 while reducing the influence of the change in vibration due to the vibration transmission characteristics of the base jig 30.
(Other embodiments)
The above embodiment can also be implemented in the following embodiments.

-In the above embodiment, the case where the rising portion 32e and the horizontally extending portion 32d are substantially orthogonal to each other in the extension portion 32c has been illustrated, but the present invention is not limited to this, and if the frame portion can be fixed to the vibration table, it is not limited to this. The rising portion and the portion extending in the horizontal direction may have an angle other than a substantially right angle, or the extending portion may have an arc shape.

-In the above embodiment, the case where the rigidity set in the extension portion 32c can be adjusted by changing the predetermined length has been illustrated, but the present invention is not limited to this, and the rigidity set in the extension portion can be adjusted by the structure of the extension portion or the extension portion. It may be set according to the material of. For example, the cylinder diameter of the extension portion may be increased, the wall thickness of the cylinder may be increased to increase the rigidity, or conversely, the cylinder diameter may be decreased, or the wall thickness of the cylinder may be reduced to reduce the rigidity. Good.

-In the above embodiment, the case where the front crosspiece member 361 is a square cylinder and the rear crosspiece member 362 is box-shaped has been illustrated. However, the present invention is not limited to this, and as long as the secondary battery can be fixed in the vehicle-mounted posture, both the front and rear crosspieces may be box-shaped, and both the front and rear crosspieces may be angular. It may be a cylinder, or the front crosspiece may be box-shaped and the rear crosspiece may be a square cylinder. Further, as long as the secondary battery can be fixed in the posture of being mounted on the vehicle, the front crosspiece member and the rear crosspiece member may have a shape other than a square cylinder or a box shape.

-In the above embodiment, the case where the secondary battery 40 is fastened to the crosspieces 361 and 362 of the frame portion 31 of the base jig 30 has been illustrated. However, the present invention is not limited to this, and the portion to which the secondary battery is fastened may be plate-shaped or may be a crosspiece as long as the structure is such that the portion to which the secondary battery is fastened can maintain higher rigidity than the legs. The shape may be a combination of plates.

-In the above embodiment, the case where the leg portion 32 is a portion where the vertical members 30a and 30b of the frame portion 31 are extended is illustrated, but the present invention is not limited to this, and the leg portion is a member different from the frame portion. However, it may be combined with the frame portion by welding or the like.

-In the above embodiment, the case where the frame portion 31 and the leg portion 32 are integrally configured in the base jig 30 has been illustrated, but the present invention is not limited to this, and the rigidity of the base jig can be appropriately set. If so, the base portion and the leg portion may be composed of separate parts. For example, the base portion and the leg portion may be combined by fitting the leg portion into the base portion or screwing the leg portion.

Since the base portion and the leg portion are composed of separate parts, it becomes easy to make the rigidity set for the base portion and the leg portion different. For example, by using metal for the base and resin for the legs, the rigidity of the legs can be set to be relatively low with respect to the base.

-In the above embodiment, the frame portion 31 is configured by combining square tubes by welding, but the present invention is not limited to this, and if the two square tubes are connected with high rigidity, the frame portion 31 is not limited to this. It may be a connection by screwing, a connection via a connecting member, or the like.

-In the above embodiment, the case where the frame portion 31 is composed of a square cylinder has been illustrated, but the present invention is not limited to this, and if the frame portion can secure appropriate rigidity, the frame portion is a cylinder or a prism. , A cylinder, a plate-shaped member, or a combination thereof. Further, by changing the member, it is possible to have a characteristic that the frequency is 0 Hz or more and the transmission coefficient of vibration of 20 Hz or less is high. Further, it is also possible to reduce the transmission rate of vibration having a frequency of 30 Hz or more and 40 Hz or less.

-In the above embodiment, the case where the vibrating unit 11 is provided with four vibrating tables 20 has been illustrated, but the present invention is not limited to this, and if the vibration required for the secondary battery test is applied, the vibrating table is used. May be 2 or 3 or 5 or more. If the number of vibration tables is small, coordinated control is easy, while if the number of vibration tables is large, the reproducibility of vehicle vibration and the like can be improved.

-In the above embodiment, the case where the vibration table 20 has three axes has been illustrated, but the present invention is not limited to this, and if it is possible to generate the vibration required for the vibration test, the vibration table has one axis or two. It may be an axis or four or more axes. Even if it is a 6-axis vibration table whose movable surface can be tilted, it is expected that distortion of the secondary battery can be suppressed by using the base jig.

-In the above embodiment, the case where the vibration exciter 10 reproduces the vibration applied to the on-board secondary battery 40 and applies it to the secondary battery 40 has been illustrated. However, the vibration device is not limited to this, and the vibration exciter may reproduce the vibration different from the vibration in the vehicle and apply it to the secondary battery as long as it is the vibration required for the vibration test of the secondary battery. That is, the vibration data may be vibration data different from the vibration in the vehicle. As a result, the applicable range of the vibration exciter can be expanded.

-In the above embodiment, the case where the battery module is a lithium ion secondary battery or a nickel hydrogen secondary battery has been illustrated, but the present invention is not limited to this, and other secondary batteries may be used.
-In the above embodiment, the case where the secondary battery 40 is mounted on an electric vehicle or a hybrid vehicle has been illustrated, but the present invention is not limited to this, and the secondary battery may be mounted on a vehicle such as a gasoline vehicle or a diesel vehicle. .. Further, the secondary battery may be used as a power source for a mobile body or a fixed installation. For example, the application destination of the power source includes a moving body such as a railroad, a ship, an aircraft or a robot, an electric product such as an information processing device, and the like.

10 ... Vibration device, 11 ... Vibration unit, 12 ... Control device, 20 ... Vibration table, 21 ... Movable surface, 22 ... Front and rear drive device, 23 ... Left and right drive device, 24 ... Vertical drive device, 30 ... Base Osamu Jig, 30a, 30b ... Vertical member, 30c, 30d ... Horizontal member, 31 ... Frame part, 32 ... Leg part, 32a ... Base end, 32b ... Tip, 32c ... Extension part, 32d ... Part, 32e ... Standing part, 32f ... Flange, 36a, 36b ... Height adjusting member, 37 ... Top surface, 40 ... Secondary battery, 41 ... External housing, 42L, 42R, 43C, 43L, 43R ... Fastening part, 100 ... Vehicle, 101 ... Front part , 102 ... rear, 110 ... wheels, 120 ... floor surface, 121 ... vibration calculation unit, 122 ... acceleration acquisition unit, 123 ... signal output unit, 124 ... vibration data holding unit, 125 ... vibration data, 130 ... base jig, 131, 132, 133, 134 ... Accelerometer, 141, 142, 143, 144 ... Signal line, 201, 202, 203, 204 ... Vibration table, 310 ... Mounting part, 320 ... Fixed part, 321, 322, 323 ... , 324 ... Legs, 340 ... Fixed parts, 361, 362 ... Rail members, GL ... Road surface.

Claims (9)

With multiple shakers
Movable surfaces provided on each of the plurality of vibration tables and
A base jig that is hung on the plurality of movable surfaces and to which a secondary battery is fastened,
It is provided with a control unit that controls the movement of the movable surface of the vibration table.
The base jig has a base portion to which the secondary battery is fastened, and a leg portion extending from the base portion to abut the movable surface with respect to each of the plurality of movable surfaces. ,
The leg portion is fixed to the movable surface to which the tip end, which is the end portion on the side away from the base end connected to the base portion, abuts.
A vibration exciter in which the rigidity of a portion of the leg portion between the tip end and the base end is set to be lower than the rigidity of the base portion sandwiched between the leg portions. The vibrating device according to claim 1, wherein the base jig is a vibration device in which the base portion and the leg portion are integrally formed. The vibrating device according to claim 1, wherein the base jig is a vibration device in which the base portion and the leg portion are made of separate parts. The vibrating device according to any one of claims 1 to 3, wherein the base portion is composed of a frame body and a crosspiece member provided on the frame body. The vibrating device according to claim 4, wherein the secondary battery is fastened to the crosspiece member. The vibrating device according to claim 4 or 5, wherein the base portion includes a spacer for fastening the secondary battery to at least one of the fastening portions to the vehicle body. The vibrating device according to any one of claims 1 to 6, which imparts vibration having a frequency of 20 Hz or less to the secondary battery. An acceleration sensor is installed at the fastening part of the secondary battery.
The vibrating device according to any one of claims 1 to 7, wherein the control unit controls the movement of the movable surface based on the acceleration detected by the acceleration sensor. With multiple shakers
Movable surfaces provided on each of the plurality of vibration tables and
A base jig that is hung on the plurality of movable surfaces and to which a secondary battery is fastened,
It is provided with a control unit that controls the movement of the movable surface of the vibration table so that vibration corresponding to the vibration of the vehicle is applied to the secondary battery.
The base jig has a base portion to which the secondary battery is fastened, and a leg portion extending from the base portion to abut the movable surface with respect to each of the plurality of movable surfaces. ,
The leg portion is fixed to the movable surface to which the tip end, which is the end portion on the side away from the base end connected to the base portion, abuts.
A vehicle vibration reproducing device in which the rigidity of a portion between the tip end and the base end of the leg portion is set lower than the rigidity of the base portion sandwiched between the leg portions.

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