Power storage module

Abstract

This power storage module comprises at least one cylindrical power storage device (60), and a lower holder (11) that holds the power storage device (60) in the axial direction (Z). The lower holder (11) includes a body (12) which includes a container portion (12A) that holds the power storage device (60), and an outer peripheral portion (13) that surrounds the body (12) with a gap (14) provided from the body (12). If a direction orthogonal to the axis direction (Z) of the power storage device (60) is a direction (Y), and a direction orthogonal to both the axial direction and the direction (Y) is a direction (X), the gap (14) includes a gap (14A) between the body (12) and the outer peripheral portion (13) in the direction (Y), in which gap (14A) a shock absorbing portion is provided.

Description

Energy storage module

[0001] The present disclosure relates to an electricity storage module, and in particular to a holder structure for holding an electricity storage device.

[0002] An electric storage module is used as a power source equipped with a plurality of electric storage devices. The electric storage module may be mounted on a vehicle. In an electric storage module mounted on a vehicle, if an impact load is applied, for example, during a side collision of the vehicle, the load may be applied to the electric storage devices, causing the electric storage devices to deform and become unsafe. For example, Patent Document 1 discloses a technology in which a recessed shape provided in a holder breaks the holder during a side collision of the vehicle, thereby preventing the load from being applied to the electric storage devices.

[0003] JP 2015-156320 A

[0004] However, in an on-board power storage module, there is still room for improvement in reducing the load applied to the power storage device when an impact load is applied.

[0005] Therefore, an object of the present disclosure is to provide an electricity storage module that can reduce the load applied to an electricity storage device when an impact load is applied.

[0006] The energy storage module according to the present disclosure comprises at least one cylindrical energy storage device and a holder that holds the energy storage device in the axial direction, the holder having a main body including a storage section that holds the energy storage device, and an outer peripheral portion that surrounds the main body with a gap between it and the main body, and is characterized in that when a direction perpendicular to the axial direction of the energy storage device is defined as a first direction and a direction perpendicular to the axial direction and the first direction is defined as a second direction, an impact buffer portion is provided in the first gap between the main body and the outer peripheral portion in the first direction of the gap.

[0007] According to the power storage module of the present disclosure, it is possible to reduce the load applied to the power storage device when an impact load is applied.

[0008] 15A is a perspective view showing the energy storage module of the first embodiment. FIG. 15B is a plan view showing the energy storage module of the first embodiment. FIG. 15C is a schematic view showing an energy storage device. FIG. 15D is a plan view showing the operation and effect of the energy storage module of the first embodiment. FIG. 15E is a plan view showing a continuation of FIG. 4A. FIG. 15F is a plan view showing a continuation of FIG. 4B. FIG. 15C is a perspective view showing the energy storage module of the second embodiment. FIG. 15D is a plan view showing the operation and effect of the energy storage module of the second embodiment. FIG. 15E is a plan view showing a continuation of FIG. 7A. FIG. 15F is a plan view showing a continuation of FIG. 7B. FIG. 15C is a perspective view showing the energy storage module of the third embodiment. FIG. 15D is a plan view showing the operation and effect of the energy storage module of the third embodiment. FIG. 15E is a plan view showing a continuation of FIG. 10A. FIG. 15F is a plan view showing a continuation of FIG. 10B. FIG. 15F is a perspective view showing the lower holder of the fourth embodiment. FIG. 15C is a plan view showing the pole crushing pusher of the fourth embodiment. FIG. 15D is a plan view showing the operation and effect of the energy storage module of the fourth embodiment. FIG. 15E is a plan view showing the battery pack of the fourth embodiment. FIG. 15F is a plan sectional view showing the vehicle of the fourth embodiment. FIG. 15F is a sectional view taken along line AA of FIG. 15. FIG. 15C is a perspective view showing the lower holder of the fifth embodiment. FIG. 13 is a plan view illustrating the operation and effect of the energy storage module according to the fifth embodiment.

[0009] <0. Overview of the Embodiments> An example of an embodiment of the present disclosure will be described in detail below. In the following description, specific shapes, materials, directions, numerical values, etc. are examples to facilitate understanding of the present disclosure and can be changed as appropriate depending on the application, purpose, specifications, etc.

[0010] Five embodiments of the energy storage module are described below. Each energy storage module has a different lower holder structure. The energy storage module can reduce the load applied to the energy storage device when an impact load is applied, as will be described in detail later.

[0011] In the following description, the same reference numerals will be used in each embodiment for the same components as those in other embodiments. Furthermore, in each embodiment, corresponding components that are assigned reference numerals different from those in other embodiments will be considered to be the same as those in other embodiments unless otherwise specified.

[0012] In the following, the axial direction of the cylindrical energy storage device described later in relation to the energy storage module will be referred to as the vertical direction Z, the direction perpendicular to the vertical direction Z as direction Y, and the direction perpendicular to the vertical direction Z and direction Y as direction X.

[0013] The power storage module of each embodiment is mounted on an electric vehicle as a power source for a motor that drives the electric vehicle. Note that the power storage module is not limited to being mounted on an electric vehicle, and may be used as a power source for motor-driven electric devices such as power tools, power-assisted bicycles, electric motorcycles, electric wheelchairs, electric tricycles, and electric carts. Furthermore, the use of the power storage module is not limited, and it may be used as a power source for various electric devices used indoors and outdoors, such as vacuum cleaners, radios, lighting devices, digital cameras, and video cameras.

[0014] The power storage module of each embodiment may be provided in a power storage pack. The power storage pack is a power source provided in the body of an electric vehicle and has a housing in which a plurality of power storage modules are arranged. Furthermore, the power storage module of each embodiment may be provided in the body of the vehicle.

[0015] 1-1. Configuration of the Energy Storage Module of the First Embodiment The configuration of the energy storage module 10 of the first embodiment will be described with reference to FIGS. 1 to 4C.

[0016] As shown in Figures 1 and 2, the storage module 10 includes a plurality of cylindrical storage devices 60, an upper holder 9 that holds the upper sides of each of the storage devices 60 in the vertical direction Z, and a lower holder 11 that holds the lower sides of each of the storage devices 60.

[0017] The plurality of power storage devices 60 may be packed as densely as possible within the power storage module 10 while taking safety into consideration, and adjacent power storage devices 60 may be arranged substantially close to each other. For example, in a plan view, the power storage devices 60 are arranged such that six power storage devices 60 surround one power storage device 60 (or arranged in a staggered pattern).

[0018] 3 , a cylindrical lithium-ion secondary battery is used as the power storage device 60 in this example, but a nickel-metal hydride battery, a capacitor, or the like may also be used. The power storage device 60 includes an electrode group 64, for example, in which a strip-shaped positive electrode 61 and a strip-shaped negative electrode 62 are wound with a strip-shaped separator 63 interposed therebetween, a cylindrical outer can 65 that accommodates the electrode group 64 together with an electrolyte solution, a sealing body 66 that seals the opening of the outer can 65 in an insulated state, a foil-shaped positive electrode lead 67 that electrically connects the positive electrode 61 and the sealing body 66, and a negative electrode lead 68 that electrically connects the negative electrode 62 and the outer can 65. An insulating gasket 69 may be disposed between the outer periphery of the sealing body 66 and the inner circumferential surface of the opening of the outer can 65.

[0019] An annular groove 65A is formed on the outer peripheral surface of the outer can 65, on the opening side. This groove 65A is formed as an annular protrusion on the inner peripheral surface of the outer can 65. The gasket 69 and sealing body 66 are disposed on this annular protrusion within the outer can 65. Furthermore, the opening end of the outer can 65 is crimped so that it tilts toward the inside of the outer can 65, with the gasket 69 disposed on the inner peripheral side. The crimped opening end and the protrusion sandwich the sealing body 66 in the axial direction via the gasket 69, thereby sealing the opening of the outer can 65.

[0020] The sealing body 66 may be provided with a current interrupter (CID) or an exhaust valve that ruptures when the pressure inside the outer can 65 reaches or exceeds a predetermined level. Furthermore, an insulating plate 70 for insulating the electrode group 64 from the outer can 65 may be provided between the electrode group 64 and the bottom of the outer can 65 or between the electrode group 64 and the protrusion (groove 65A). When the insulating plate 70 is provided, the positive electrode lead 67 may extend through a through-hole formed in the insulating plate 70. The negative electrode lead 68 may extend through a through-hole formed in the insulating plate 70 or may extend by bypassing the insulating plate 70. In the energy storage device 60, as described above, the positive electrode terminal may be provided on the top surface of the sealing body 66, and the negative electrode terminal may be provided on the crimped shoulder of the outer can 65.

[0021] 1 and 2 again, the upper holder 9 holds the upper sides of the plurality of power storage devices 60 as described above. The upper holder 9 is made of, for example, a thermoplastic resin. Thermoplastic resins are broadly classified into general-purpose plastics and engineering plastics, and examples thereof include polyethylene, polypropylene, polyamide, and ABS.

[0022] As described above, the lower holder 11 serving as a holder holds the lower sides of the plurality of power storage devices 60. The length of the lower holder 11 in the vertical direction Z is sufficiently longer than the length of the upper holder 9 in the vertical direction Z. Therefore, the lower holder 11 holds the middle and lower portions of the plurality of power storage devices 60. Like the upper holder 9, the lower holder 11 is formed of, for example, a thermoplastic resin.

[0023] The lower holder 11 has a plurality of main bodies 12 that respectively hold a plurality of power storage devices 60, and an outer peripheral portion 13 that surrounds the main bodies 12 with gaps 14 provided therebetween. In the lower holder 11 of this embodiment, two main bodies 12 are arranged side by side in the direction X, but this is not limiting. Three or more main bodies 12 may be arranged side by side in the direction X, or two or more main bodies 12 may be arranged side by side in the direction Y.

[0024] The main body 12 is formed in a substantially rectangular shape when viewed in the vertical direction Z, with all corners formed in an arc shape. The main body 12 is formed with accommodation sections 12A that accommodate the plurality of power storage devices 60, respectively. The accommodation sections 12A are formed in a circular shape when viewed in the vertical direction Z. Middle and lower sections of the power storage devices 60 are fitted into the accommodation sections 12A.

[0025] As described above, the outer peripheral portion 13 is formed to surround the main body 12 with the gap 14 provided. The outer peripheral portion 13 is formed in a rectangular cylindrical shape when viewed from the vertical direction Z. In this embodiment, the two main bodies 12 are arranged side by side in the direction X, so the outer peripheral portion 13 is formed in a rectangular frame shape with the direction X as the longitudinal direction when viewed from the vertical direction Z. The length of the outer peripheral portion 13 in the vertical direction Z is approximately the same as the length of the main body 12 in the vertical direction Z. Note that in this embodiment, the outer peripheral portion 13 is a cylindrical wall, but is not limited to this. For example, the outer peripheral portion 13 may be a plurality of walls that extend in the direction X and are arranged in the direction Y on either side of the main body 12.

[0026] The outer circumferential portion 13 has a plurality of fastening portions 13A arranged in the direction X. For example, fastening portions 13A for fastening the lower holder 11 to an electricity storage pack (not shown) are formed in positions of the outer circumferential portion 13 corresponding to corners of the main body 12. Six fastening portions 13A are formed in the outer circumferential portion 13. In this embodiment, the lower holder 11 is fastened to the electricity storage pack with fasteners such as bolts. The lower holder 11 may also be fastened to the body of a vehicle with fasteners such as bolts. The fastening portions 13A are cylindrical and may have female threads formed on their inner circumferential surfaces to be fastened with highly rigid bolts. The female threads are made of a highly rigid member that can withstand fastening of the bolts. Therefore, the fastening portions 13A are particularly rigid portions of the outer circumferential portion 13. Furthermore, because the fastening portions 13A are fastened to the components of the electricity storage pack or the vehicle body as described above, they are particularly resistant to displacement within the electricity storage module 10.

[0027] As described above, the gap 14 is a gap portion formed between the main body 12 and the outer periphery 13. The gap 14 includes a gap 14A as a first gap, a gap 14B as a second gap, and a gap 14C as a third gap, each of which will be described in detail later.

[0028] Gap 14A, which serves as a first gap, is formed between main body 12 and outer periphery 13 in direction Y. As will be described in detail later, when an impact load is applied from one side of outer periphery 13 in direction Y during a side collision of a vehicle (or electronic device), gap 14A on the other side serves as a clearance for main body 12. This allows main body 12 to move to the other side in direction Y within outer periphery 13. A support portion 15, which will be described in detail later, is formed in gap 14A.

[0029] The multiple support portions 15 connect each of the multiple second connection portions aligned in the direction X of the main body 12 to the first connection portion of the outer peripheral portion 13 when viewed from the vertical direction Z. More specifically, each support portion 15 extends at an angle so as to intersect with the direction Y, connecting the portion of the outer peripheral portion 13 facing the central portion of the main body 12 in the direction X. In other words, the support portions 15 form a truss structure when viewed from the vertical direction Z. Furthermore, the support portions 15 are provided at both ends of the main body 12 in the Y direction. Note that adjacent support portions 15 may be integrated with each other or may be connected to different first connection portions. The vertical length of the support portion 15 is approximately the same as the vertical length of the main body 12 and the outer peripheral portion 13. Note that the support portions 15 may be formed in the voids 14B. However, the above-mentioned vertical lengths in the Z direction may be different.

[0030] When an impact load is applied from one side of the outer circumferential portion 13 in the direction Y during a side collision of the vehicle, the support portion 15 can distribute the impact load from the outer circumferential portion 13 to the main body 12. The impact load can be distributed to both ends of the main body 12 in the direction X where the power storage device 60 is not disposed, and the main body 12 can be pressed in the direction Y without applying a load to the power storage device 60.

[0031] A gap 14B as a second gap is formed between the main body 12 and the outer periphery 13 in the direction X. By forming the gap 14B, when an impact load is applied from one side of the outer periphery 13 in the direction Y during a side collision of the vehicle, the main body 12 can slide to the other side in the direction Y within the outer periphery 13. A weak portion 16, the details of which will be described later, is formed in the gap 14B.

[0032] The second fragile portion 16 connects the main body 12 and the outer periphery 13 in the direction X. When the main body 12 attempts to move in the direction Y relative to the outer periphery 13, the fragile portion 16 breaks if a predetermined or greater stress is generated.

[0033] A gap 14C as a third gap is formed between the main body 12 and an adjacent main body 12. By forming the gap 14C, when an impact load is applied from one side of the outer peripheral portion 13 in the direction Y during a side collision of the vehicle, the main body 12 can slide to the other side in the direction Y within the outer peripheral portion 13. A weak portion 17, the details of which will be described later, is formed in the gap 14C.

[0034] The fragile portion 17, which serves as a third fragile portion, connects the main body 12 to the main body 12 in the direction X. Furthermore, when the main body 12 attempts to move in the direction Y relative to the main body 12, the fragile portion 17 breaks if a predetermined or greater stress is generated.

[0035] This disclosure assumes a side collision of a vehicle (or electronic device) equipped with an energy storage module 10. Therefore, a collision test in direction Y is performed on the energy storage module 10 using a pole crushing plunger P. As shown in Fig. 4A , an impact load is applied to the energy storage module 10 from one side in direction Y using the pole crushing plunger P.

[0036] At this time, an impact load acts on one side of the outer periphery 13 of the lower holder 11 in the direction Y, and the outer periphery 13 is pressed by the action of this load, and the support portion 15 is pressed by the outer periphery 13, and both ends of the main body 12 in the direction X are pressed by the support portion 15.

[0037] Furthermore, a first weak portion weaker than the support portion 15 is provided in the outer peripheral portion 13 between the first connection portion and the fastening portion 13A in the X direction. As shown in FIG. 4B , the outer peripheral portion 13 breaks at the first weak portion due to the impact load of the pole crushing plunger P. Furthermore, as described above, the end of the main body 12 in the X direction is pressed, causing the main body 12 to move to the other side in the Y direction. As the main body 12 moves to the other side in the Y direction, the weak portions 16 and 17 break, and the outer peripheral portion 13 on the other side in the Y direction breaks at the first weak portion. At this time, the main body 12 is prevented from being crushed by the impact load because there is clearance in the gap 14A on the other side in the Y direction. Furthermore, as shown in FIG. 4C , the support portion 15 breaks.

[0038] According to the energy storage module 10, even when an impact load is applied, the energy storage module 10 breaks in two stages, by breaking the outer periphery 13 and the support portion 15, and by providing the gap 14A to ensure a clearance portion for the main body 12, so that the impact load is absorbed by the lower holder 11 and the load acting on the energy storage device 60 is reduced. This makes it possible to increase the load resistance of the energy storage module 10.

[0039] 2-1. Configuration of Power Storage Module of Second Embodiment The configuration of the power storage module 20 of the second embodiment will be described with reference to FIGS. 5 to 7C.

[0040] 5 and 6 , the energy storage module 20 includes a plurality of cylindrical energy storage devices 60, upper holders 9 that hold the upper sides of the plurality of energy storage devices 60 in the up-down direction Z, and lower holders 21 that hold the lower sides of the plurality of energy storage devices 60. The energy storage devices 60 and the upper holders 9 have the same configuration as in the first embodiment, and therefore a description thereof will be omitted.

[0041] As described above, the lower holder 21 serving as a holder holds the lower sides of the plurality of power storage devices 60. The length of the lower holder 21 in the vertical direction Z is sufficiently longer than the length of the upper holder 9 in the vertical direction Z. Therefore, the lower holder 21 holds the middle and lower portions of the plurality of power storage devices 60. Like the upper holder 9, the lower holder 21 is formed of, for example, a thermoplastic resin.

[0042] The lower holder 21 has a plurality of main bodies 22 that respectively hold a plurality of power storage devices 60, and an outer periphery 23 that surrounds the main bodies 22 with gaps 24 provided therebetween. In the lower holder 21 of this embodiment, two main bodies 22 are arranged side by side in the direction X, but this is not limiting. Three or more main bodies 22 may be arranged side by side in the direction X, or two or more main bodies 22 may be arranged side by side in the direction Y.

[0043] The main body 22 is formed in a substantially rectangular shape when viewed in the vertical direction Z, with all corners formed in an arc shape. The main body 22 is formed with accommodation sections 22A that accommodate each of the multiple power storage devices 60. The accommodation sections 22A are formed in a circular shape when viewed in the vertical direction Z. Middle and lower sections of the power storage devices 60 are fitted into the accommodation sections 22A.

[0044] As described above, the outer peripheral portion 23 is formed to surround the main body 22 with the gap 24 provided. The outer peripheral portion 23 is formed in a rectangular cylindrical shape when viewed in the vertical direction Z. In this embodiment, the two main bodies 22 are arranged side by side in the direction X, so the outer peripheral portion 23 is formed in a rectangular frame shape with the direction X as the longitudinal direction when viewed in the vertical direction Z. The length of the outer peripheral portion 23 in the vertical direction Z is approximately the same as the length of the main body 22 in the vertical direction Z. Note that in this embodiment, the outer peripheral portion 23 is a cylindrical wall, but is not limited to this. For example, the outer peripheral portion 23 may be a plurality of walls that extend in the direction X and are arranged in the direction Y on either side of the main body 22.

[0045] The outer circumferential portion 23 has a plurality of fastening portions 23A aligned in the direction X. For example, fastening portions 23A for fastening the lower holder 21 to an electricity storage pack (not shown) are formed at positions of the outer circumferential portion 23 corresponding to corners of the main body 22. Six fastening portions 23A are formed on the outer circumferential portion 23. In this embodiment, the lower holder 21 is fastened to the electricity storage pack with fasteners such as bolts. The lower holder 21 may also be fastened to the body of a vehicle with fasteners such as bolts. The fastening portions 23A are cylindrical and may have female threads formed on their inner circumferential surfaces to be fastened with highly rigid bolts. The female threads are made of a highly rigid member that can withstand fastening of the bolts. Therefore, the fastening portions 23A are particularly rigid portions of the outer circumferential portion 23. Furthermore, because these fastening portions are fastened to the components of the electricity storage pack or the vehicle body as described above, they are particularly resistant to displacement within the electricity storage module 20.

[0046] The portion of the outer periphery 23 along the direction X is made of a material capable of cushioning and suppressing vibration, such as a first leaf spring 28. The first leaf spring 28 is plate-shaped and made of a metal plate such as iron, stainless steel, or copper, and has a predetermined or higher spring characteristic. The first leaf spring 28 and the second leaf spring 29 may be fixed to each other at the first connecting portion using a clip or the like.

[0047] As described above, the gap 24 is a gap portion formed between the main body 22 and the outer periphery 23. The gap 24 includes a gap 24A as a first gap, a gap 24B as a second gap, and a gap 24C as a third gap, each of which will be described in detail later.

[0048] A gap 24A as a first gap is formed between the main body 22 and the outer periphery 23 in the direction Y. As will be described in detail later, when an impact load is applied from one side of the outer periphery 23 in the direction Y during a vehicle collision, the gap 24A on the other side serves as a clearance for the main body 22. This allows the main body 22 to move to the other side in the direction Y within the outer periphery 23. A second leaf spring 29, which will be described in detail later, is formed in the gap 24A.

[0049] The second leaf springs 29 are plate-shaped and made of metal, such as iron, stainless steel, or copper, and have a predetermined spring characteristic. The second leaf springs 29 are, for example, V-shaped plates protruding toward the outer periphery 23. However, the second leaf springs 29 may have a flat surface at the first connection portions connecting to the first leaf springs 28. The second leaf springs 29 are connected to a pair of second connection portions aligned in the X direction on the main body 22. More specifically, the second leaf springs 29 connect the X-direction ends of the main body 22 to the X-direction center of the outer periphery 23 when viewed from the vertical direction Z. In other words, the second leaf springs 29 form a truss structure when viewed from the vertical direction Z. The vertical length of the second leaf springs 29 in the Z direction is approximately the same as the vertical length of the main body 22 and the outer periphery 23. However, the vertical lengths of the second leaf springs 29 in the Z direction may be different.

[0050] As will be described in detail later, the second leaf spring 29 can absorb an impact load that is applied from one side of the outer circumferential portion 23 in the Y direction during a vehicle side collision. Furthermore, the impact load can be dispersed to the second connection portion of the main body 22 that is aligned in the X direction and where the power storage device 60 is not disposed, thereby pressing the main body 22 in the Y direction without applying a load to the power storage device 60.

[0051] It should be noted that, without being limited to this embodiment, the first leaf spring 28 may be formed in a portion of the outer peripheral portion 23 along the direction Y, and the second leaf spring 29 may be provided in the gap 24B.

[0052] A gap 24B as a second gap is formed between the main body 22 and the outer periphery 23 in the direction X. By forming the gap 24B, when an impact load is applied from one side of the outer periphery 23 in the direction Y during a side collision of the vehicle, the main body 22 can slide to the other side in the direction Y within the outer periphery 23. A weak portion 26, the details of which will be described later, is formed in the gap 24B.

[0053] The second fragile portion 26 connects the main body 22 and the outer periphery 23 in the direction X. When the main body 22 attempts to move in the direction Y relative to the outer periphery 23, the fragile portion 26 breaks if a predetermined or greater stress is generated.

[0054] A gap 24C as a third gap is formed between the main body 22 and an adjacent main body 22. By forming the gap 24C, when an impact load is applied from one side of the outer peripheral portion 23 in the direction Y during a side collision of the vehicle, the main body 22 can slide to the other side in the direction Y within the outer peripheral portion 23. A weak portion 27, the details of which will be described later, is formed in the gap 24C.

[0055] The fragile portion 27 serving as the third fragile portion connects the main body 22 to the main body 22 in the direction X. Furthermore, when the main body 22 attempts to move in the direction Y relative to the main body 22, the fragile portion 27 breaks if a predetermined or greater stress is generated.

[0056] This disclosure assumes a side collision of a vehicle (or electronic device) equipped with an energy storage module 20. Therefore, a collision test in direction Y is performed on the energy storage module 20 using a pole crushing plunger P. As shown in Fig. 7A , an impact load is applied to the energy storage module 20 from one side in direction Y using the pole crushing plunger P.

[0057] At this time, an impact load acts on one side of the outer periphery 23 of the lower holder 21 in the direction Y, and the first leaf spring 28 is pressed by the action of this load, which presses the second leaf spring 29, and the second leaf spring 29 presses the second connection portion of the main body 22.

[0058] Furthermore, a first weak portion weaker than the second leaf spring 29 is provided in the outer peripheral portion 23 between the first connection portion and the fastening portion 23A in the direction X. As shown in FIG. 7B , the outer peripheral portion 23 breaks at the first weak portion due to the impact load of the pole crushing plunger P. Furthermore, as described above, the second connection portion of the main body 22 is pressed, causing the main body 22 to move to the other side in the direction Y. As the main body 22 moves to the other side in the direction Y, the weak portions 26 and 27 break, and the first weak portion of the outer peripheral portion 23 on the other side in the direction Y breaks. At this time, the main body 22 is not crushed by the impact load because there is clearance in the gap 24A on the other side in the direction Y. Furthermore, as shown in FIG. 7C , the second leaf spring 29 deforms and bends.

[0059] According to the energy storage module 20, even when an impact load is applied, the impact load is absorbed by the lower holder 21 by breaking the first leaf spring from the outer periphery 23, the elastic force of the first leaf spring 28 and the second leaf spring 29, and the provision of the gap 24A to ensure a clearance portion for the main body 22, thereby reducing the load acting on the energy storage device 60. This makes it possible to increase the load resistance of the energy storage module 20.

[0060] 3-1. Configuration of Power Storage Module of Third Embodiment The configuration of the power storage module 30 of the third embodiment will be described with reference to FIGS. 8 to 10C.

[0061] 8 and 9 , the energy storage module 30 includes a plurality of cylindrical energy storage devices 60, upper holders 9 that hold the upper sides of the plurality of energy storage devices 60 in the up-down direction Z, and lower holders 31 that hold the lower sides of the plurality of energy storage devices 60. The energy storage devices 60 and the upper holders 9 have the same configuration as in the first embodiment, and therefore will not be described here.

[0062] As described above, the lower holder 31 serving as a holder holds the lower sides of the plurality of power storage devices 60. The length of the lower holder 31 in the vertical direction Z is sufficiently longer than the length of the upper holder 9 in the vertical direction Z. Therefore, the lower holder 31 holds the middle and lower portions of the plurality of power storage devices 60. Like the upper holder 9, the lower holder 31 is formed of, for example, a thermoplastic resin.

[0063] The lower holder 31 has a plurality of main bodies 32 that respectively hold a plurality of power storage devices 60, and an outer peripheral portion 33 that surrounds the main bodies 32 with a gap 34 provided therebetween. In the lower holder 31 of this embodiment, two main bodies 32 are arranged side by side in the direction X, but this is not limiting. Three or more main bodies 32 may be arranged side by side in the direction X, or two or more main bodies 32 may be arranged side by side in the direction Y.

[0064] The main body 32 is formed in a substantially rectangular shape when viewed in the vertical direction Z, with all corners formed in an arc shape. The main body 32 is formed with accommodation sections 32A that accommodate each of the multiple power storage devices 60. The accommodation sections 32A are formed in a circular shape when viewed in the vertical direction Z. Middle and lower sections of the power storage devices 60 are fitted into the accommodation sections 32A.

[0065] As described above, the outer peripheral portion 33 is formed to surround the main body 32 with the gap 34 provided. The outer peripheral portion 33 is formed in a rectangular cylindrical shape when viewed in the vertical direction Z. In this embodiment, the two main bodies 32 are arranged side by side in the direction X, so the outer peripheral portion 33 is formed in a rectangular frame shape with the direction X as the longitudinal direction when viewed in the vertical direction Z. The length of the outer peripheral portion 33 in the vertical direction Z is approximately the same as the length of the main body 32 in the vertical direction Z. Note that in this embodiment, the outer peripheral portion 33 is a cylindrical wall, but is not limited to this. For example, the outer peripheral portion 33 may be a plurality of walls that extend in the direction X and are arranged in the direction Y on either side of the main body 32.

[0066] The outer peripheral portion 33 has a plurality of fastening portions 33A aligned in the direction X. For example, fastening portions 33A for fastening the lower holder 31 to an electricity storage pack (not shown) are formed at positions of the outer peripheral portion 33 corresponding to corners of the main body 32. Six fastening portions 33A are formed on the outer peripheral portion 33. The lower holder 31 of this embodiment is fastened to the electricity storage pack with fasteners such as bolts. Note that the lower holder 31 may also be fastened to the body of a vehicle with fasteners such as bolts. The fastening portions 33A are cylindrical and may have female threads formed on their inner circumferential surfaces so as to be fastened with highly rigid bolts. This female thread is made of a member with high rigidity to withstand fastening of the bolts. Therefore, the fastening portions 33A are particularly rigid portions of the outer peripheral portion 33. Furthermore, because these fastening portions are fastened to the members of the electricity storage pack or the vehicle body as described above, they are particularly resistant to displacement within the electricity storage module 30.

[0067] As described above, the gap 34 is a gap portion formed between the main body 32 and the outer periphery 33. The gap 34 includes a gap 34A as a first gap, a gap 34B as a second gap, and a gap 34C as a third gap, each of which will be described in detail later.

[0068] Gap 34A, which serves as a first gap, is formed between main body 32 and outer periphery 33 in direction Y. As will be described in detail later, when an impact load is applied from one side of outer periphery 33 in direction Y during a vehicle (or electronic device) collision, gap 34A on the other side serves as a clearance for main body 32. This allows main body 32 to move to the other side in direction Y within outer periphery 33. An arch-shaped leaf spring 35, which will be described in detail later, is provided in gap 34A.

[0069] The leaf spring 35 is plate-shaped and formed from a metal plate such as iron, stainless steel, or copper, and has a predetermined spring characteristic or higher. The leaf spring 35 is formed in an arch shape that bulges outward in the direction Y when viewed from the vertical direction Z. Both ends of the leaf spring 35 in the direction X are fixed to a plurality of second connection portions arranged in the direction X of the main body 32. The leaf spring 35 may abut against the first connection portions and press against the first connection portions. The length of the leaf spring 35 in the vertical direction Z is approximately the same as the length of the main body 32 and the outer peripheral portion 33 in the vertical direction Z. The leaf spring 35 may be provided in the second gap 34B. However, the above-mentioned lengths in the vertical direction Z may be different.

[0070] The leaf spring 35 can absorb an impact load applied from one side of the outer peripheral portion 33 in the Y direction during a side collision of the vehicle. Furthermore, the impact load can be dispersed to the second connection portion of the main body 32 arranged in the X direction where the power storage device 60 is not disposed, thereby pressing the main body 32 in the Y direction without applying the impact load to the power storage device 60.

[0071] A gap 34B as a second gap is formed between the main body 32 and the outer periphery 33 in the direction X. By forming the gap 34B, when an impact load is applied from one side of the outer periphery 33 in the direction Y during a side collision of the vehicle, the main body 32 can slide to the other side in the direction Y within the outer periphery 33. A weak portion 36, the details of which will be described later, is formed in the gap 34B.

[0072] The second fragile portion 36 connects the main body 32 and the outer periphery 33 in the direction X. When the main body 32 attempts to move in the direction Y relative to the outer periphery 33, the fragile portion 36 breaks if a predetermined or greater stress is generated.

[0073] A gap 34C as a third gap is formed between the main bodies 32. By forming the gap 34C, when an impact load is applied from one side of the outer peripheral portion 33 in the direction Y during a side collision of the vehicle, the main body 32 can slide to the other side in the direction Y within the outer peripheral portion 33. A weak portion 37, the details of which will be described later, is formed in the gap 34C.

[0074] The fragile portion 37 serving as a third fragile portion connects the main body 32 to the main body 32 in the direction X. Furthermore, when the main body 32 attempts to move in the direction Y relative to the main body 32, the fragile portion 37 breaks if a predetermined or greater stress is generated.

[0075] This disclosure assumes a side collision of a vehicle (or electronic device) equipped with an energy storage module 30. Therefore, a collision test in direction Y is conducted on the energy storage module 30 using a pole crushing plunger P. As shown in Fig. 10A , an impact load is applied to the energy storage module 30 from one side in direction Y using the pole crushing plunger P.

[0076] At this time, an impact load acts on the right side of the outer periphery 33 of the lower holder 31 in the direction Y, and the outer periphery 33 is pressed by the load, which presses the leaf spring 35, and the leaf spring 35 presses both ends of the main body 32 in the direction X.

[0077] Furthermore, a first weak portion weaker than the leaf spring 35 is provided in the outer peripheral portion 33 between the first connection portion and the fastening portion 33A in the X direction. As shown in FIG. 10B , the outer peripheral portion 33 breaks at the first weak portion due to the impact load of the pole crushing plunger P. Furthermore, as described above, the end of the main body 32 in the X direction is pressed, causing the main body 32 to move to the other side in the Y direction. As the main body 32 moves to the other side in the Y direction, the weak portions 36 and 37 break, and the outer peripheral portion 33 on the left side in the Y direction breaks at the first weak portion. At this time, the main body 32 has clearance in the gap 34A on the left side in the Y direction, preventing it from being crushed by the impact load. Furthermore, as shown in FIG. 10C , the leaf spring 35 deforms and bends.

[0078] According to the energy storage module 30, even when an impact load is applied, the impact load can be absorbed by the lower holder 31 by breaking the outer circumferential portion 33, by the elastic force of the leaf spring 35, and by providing the gap 34A to ensure a clearance portion of the main body 32, thereby reducing the load acting on the energy storage device 60. This makes it possible to increase the load resistance of the energy storage module 30.

[0079] 4-1. Configuration of the Power Storage Module of the Fourth Embodiment The configuration of the power storage module of the fourth embodiment will be described with reference to FIGS. 11 and 12. FIG.

[0080] The energy storage module includes a plurality of cylindrical energy storage devices 60 (see FIG. 3), upper holders that hold the upper sides of the plurality of energy storage devices in the up-down direction Z, and lower holders 41 that hold the lower sides of the plurality of energy storage devices 60. The energy storage devices 60 and the upper holders have the same configuration as in the first embodiment, and therefore a description thereof will be omitted.

[0081] 11 , the lower holder 41 serving as a holder holds the lower sides of the plurality of power storage devices 60 as described above. The length of the lower holder 41 in the vertical direction Z is sufficiently longer than the length of the upper holder in the vertical direction Z. Therefore, the lower holder 41 holds the middle and lower portions of the plurality of power storage devices 60. The lower holder 41 is formed of, for example, a thermoplastic resin, similar to the upper holder.

[0082] The lower holder 41 is formed in a substantially rectangular shape when viewed in the vertical direction Z. The lower holder 41 is formed with accommodation portions 42A that accommodate the plurality of power storage devices, respectively. The accommodation portions 42A are formed in a circular shape when viewed in the vertical direction Z. The middle and lower portions of the power storage devices 60 are fitted into the accommodation portions 42A.

[0083] A plurality of fastening portions 43A are formed at the end of the lower holder 41 in the direction Y, and are aligned in the direction X for fastening the lower holder 41 to an electricity storage pack (not shown). Note that a plurality of fastening portions 43A may also be formed at the end of the lower holder 41 in the direction X. The lower holder 41 of this embodiment is fastened to the electricity storage pack with fasteners such as bolts. Note that the lower holder 41 may also be fastened to the vehicle body with fasteners such as bolts. The fastening portions 43A are formed as semicircular convex portions that protrude outward in the direction Y when viewed from the vertical direction Z. The fastening portions 43A are cylindrical and may have a female screw portion with a thread formed on the inner circumferential surface to be fastened with a highly rigid bolt. This female screw portion is made of a member with high rigidity to withstand fastening of the bolt. Therefore, the fastening portions 43A are particularly rigid portions of the lower holder 41. Furthermore, because these fastening portions are fastened to the components of the electricity storage pack or the vehicle body as described above, they are particularly resistant to displacement among the electricity storage module of this embodiment.

[0084] In other words, the distance between the fastening portion 43A and the adjacent power storage device (first power storage device) is longer than the distance between this power storage device and the power storage device (second power storage device) adjacent to this power storage device. In other words, the above-mentioned storage portion 42A is not formed near the fastening portion 43A. In other words, the power storage device 60 is not disposed near the fastening portion 43A. More specifically, the storage portion 42A is not formed within a range from the fastening portion 43A to within the diameter of the power storage device 60 in the direction Y. In other words, the distance between the center of the fastening portion 43A and the center of the adjacent storage portion 42A is formed to be greater than the diameter of the power storage device 60.

[0085] With the above configuration, when an impact load is applied to the fastening portion 43A from one side in direction Y during a side collision of a vehicle (or electronic device), the impact load acting on the storage device 60 can be reduced because the storage device 60 is not positioned near the fastening portion 43A.

[0086] The fastening portion 43A is formed further outward than the accommodating portion 42A in the direction Y. More specifically, the accommodating portion 42A is formed further inward than the head of the fixing tool in the fastening portion 43A in the direction Y.

[0087] As shown in FIG. 12, the distance S between adjacent fastening portions 43A in the direction X is １ is determined based on the radius R of the pole crushing plunger P when it is assumed that the pole crushing plunger P will collide from the direction Y. Specifically, the spacing S of the fastening portions 43A in the direction X is １ is determined by the following formula, where r is the radius of the hole of the fastening portion 43A.

[0088]

[0089] With the above configuration, when the pole crushing pusher P collides from one side in direction Y, the pole crushing pusher P is prevented from entering by the fixing devices fastened at the fastening portions 43A and the fixing devices fastened at the fastening portions 43A.

[0090] This disclosure assumes a side collision of a vehicle (or electronic device) equipped with an energy storage module. Therefore, a collision test in direction Y is conducted on the energy storage module using a pole crushing plunger P. As shown in Fig. 13 , an impact load is applied to the energy storage module from the right side in direction Y using the pole crushing plunger P.

[0091] For example, when the pole crushing pusher P collides with the fastening portion 43A, the electricity storage device 60 is not disposed near the fastening portion 43A, so that it is possible to reduce the impact load acting on the electricity storage device 60. Also, when the pole crushing pusher P collides with the fastening portion 43A between the fastening portions 43A, the distance S between the fastening portions 43A is reduced. １Since is determined as described above, the fasteners fastened at fastening portion 43 and the fasteners fastened at fastening portion 43A prevent the pole crushing pusher P from entering, thereby reducing the impact load acting on the storage device 60.

[0092] According to the electricity storage module, even when an impact load is applied during a side collision of the vehicle, the load acting on the electricity storage device 60 can be reduced, thereby increasing the load resistance of the electricity storage module.

[0093] 4-2. Configuration of Electricity Storage Pack of Fourth Embodiment The configuration of an electricity storage pack 140 of the fourth embodiment will be described with reference to FIG.

[0094] 14, the electricity storage pack 140 includes a plurality of electricity storage modules in which a plurality of cylindrical electricity storage devices 60 (see FIG. 3) are held by a lower holder 41, and a housing 141 in which the plurality of electricity storage modules are arranged. The electricity storage devices 60 have the same configuration as in the first embodiment, and therefore a description thereof will be omitted.

[0095] The housing 141 is formed in a rectangular shape when viewed in the vertical direction Z. The housing 141 is preferably formed from a flame-retardant resin. A plurality of fastening portions 143A for fastening the housing 141 to the vehicle body are formed at the end of the housing 141 in the direction Y. The electricity storage pack 140 of this embodiment is fastened to the vehicle body with fasteners such as bolts. The fastening portions 143A are formed in semicircular convex portions that protrude outward in the direction Y when viewed in the vertical direction Z.

[0096] The distance S between adjacent fastening portions 143A in the direction X ２ is determined based on the radius R of the pole crushing plunger P when it is assumed that the pole crushing plunger P collides from the direction Y. Specifically, the interval S ２ is determined by the following formula (see FIG. 12), where r is the radius of the hole of the fastening portion 143A.

[0097]

[0098] With the above configuration, when the pole crushing pusher P collides from one side in the direction Y, the entrance of the pole crushing pusher P is blocked by the fasteners fastened at the fastening portions 143A and the fasteners fastened at the fastening portions 143A. This reduces the impact load acting on the electricity storage device 60.

[0099] 4-3. Configuration of Vehicle of Fourth Embodiment The configuration of a vehicle 240 of the fourth embodiment will be described with reference to FIGS. 15 and 16. FIG.

[0100] 15 and 16 , a vehicle 240 includes a plurality of cylindrical power storage devices 60, holders 241 that hold the plurality of power storage devices 60, exhaust ducts 245 provided on the upper parts of the holders 241, heat exchange members 246 that cool the power storage devices 60, and thermally conductive materials 247 that thermally connect the plurality of power storage devices 60 and the heat exchange members 243. The power storage devices 60 have the same configuration as in the first embodiment, and therefore a description thereof will be omitted.

[0101] The holder 241 will be described in detail later. The exhaust duct 245 exhausts gas from the inside of the power storage device 60 to the outside in the event of an abnormality in the power storage device 60. The exhaust duct 245 has an exhaust port (not shown) that communicates with the outside of the vehicle 240.

[0102] The heat exchange member 246 is disposed inside the holder 241 and cools the lower end of the power storage device 60. In this embodiment, the heat exchange member 246 is made of a thermally conductive plate-shaped metal, but may be a water-cooled pipe, an air-cooled fin, a refrigerant-cooled pipe, a panel heater, a seat heater, or the like.

[0103] The thermally conductive material 247 is interposed between the power storage device 60 and the heat exchange member 246 and thermally connects the power storage device 60 and the heat exchange member 246. The thermally conductive material 247 is a viscous fluid, and is a gel-like material that hardens after a predetermined time has passed. In this example, the thermally conductive material 247 is a two-component hardening material made of silicon containing a metal oxide (e.g., aluminum oxide, zinc oxide), a metal nitride (e.g., aluminum nitride, boron nitride), a metal oxynitride (e.g., aluminum oxynitride), or the like.

[0104] 15 , the holder 241 is made of, for example, a thermoplastic resin. The holder 241 is formed with accommodation portions 242A that accommodate the plurality of power storage devices 60, respectively. The accommodation portions 242A are formed in a circular shape when viewed from the vertical direction Z. The power storage devices 60 are fitted into the accommodation portions 242A. The accommodation portions 242A formed at the end in the direction Y are formed with a predetermined distance from the end of the holder 241 in the direction Y.

[0105] With the above configuration, when an impact load is applied from one side in direction Y during a side collision of the vehicle, the impact load acting on the power storage device 60 can be reduced.

[0106] A plurality of fastening portions 243A are formed at the end of the holder 241 in the direction Y for fastening the holder 241 to the body of the vehicle 240. The holder 241 of this embodiment is fastened to the body with fasteners such as bolts.

[0107] The distance S between adjacent fastening portions 243A in the direction X ３ is determined based on the radius R of the pole crushing plunger P when it is assumed that the pole crushing plunger P collides from the direction Y. Specifically, the interval S ３ is determined by the following formula (see FIG. 12), where r is the radius of the hole of the fastening portion 243A.

[0108]

[0109] With the above configuration, when the pole crushing pusher P collides from one side in the direction Y, the fasteners fastened at the fastening portions 243A and the fasteners fastened at the fastening portions 243A prevent the pole crushing pusher P from entering. This reduces the impact load acting on the electricity storage device 60.

[0110] 5-1. Configuration of the Power Storage Module of the Fifth Embodiment The configuration of the power storage module of the fifth embodiment will be described with reference to FIG.

[0111] 17, the energy storage module includes a plurality of cylindrical energy storage devices 60 (see FIG. 3), upper holders (not shown) that hold the upper sides of the plurality of energy storage devices 60 in the up-down direction Z, and lower holders 51 that hold the lower sides of the plurality of energy storage devices 60. The energy storage devices 60 and the upper holders have the same configuration as in the first embodiment, and therefore a description thereof will be omitted.

[0112] As described above, the lower holder 51 serves as a holder and holds the lower sides of the plurality of power storage devices 60. The length of the lower holder 51 in the vertical direction Z is sufficiently longer than the length of the upper holder 9 in the vertical direction Z. Therefore, the lower holder 51 holds the middle and lower parts of the plurality of power storage devices 60. The lower holder 51 is formed of, for example, a thermoplastic resin, similar to the upper holder.

[0113] The lower holder 51 is formed in a substantially rectangular shape when viewed in the vertical direction Z. The lower holder 51 is formed with accommodation portions 52A that accommodate the plurality of power storage devices 60, respectively. The accommodation portions 52A are formed in a circular shape when viewed in the vertical direction Z. The middle and lower portions of the power storage devices 60 are fitted into the accommodation portions 52A.

[0114] A plurality of fastening portions 53A for fastening the lower holder 51 to an electricity storage pack (not shown) are formed at an end of the lower holder 51 in the direction Y. Note that a plurality of fastening portions 53A may also be formed at an end of the lower holder 51 in the direction X. The lower holder 51 of this embodiment is fastened to the electricity storage pack with fasteners such as bolts. Note that the lower holder 51 may also be fastened to the body of the vehicle with fasteners such as bolts. The fastening portions 53A are formed as semicircular convex portions that protrude outward in the direction Y when viewed from the vertical direction Z.

[0115] The fastening portion 53A is formed further outward than the accommodating portion 52A in the direction Y. More specifically, the accommodating portion 52A is formed further inward than the head of the fixing tool in the fastening portion 53A in the direction Y.

[0116] A reinforcing plate 54 protrudes in the Y direction beyond the accommodation portion 52A and is made of a material having higher rigidity than the lower holder 51 at a position where the fastening portion 53A in the X direction of the lower holder 51 is formed. The reinforcing plate 54 is preferably made of, for example, metal and is formed integrally with the lower holder 51 by insert molding when the lower holder 51 is molded. The length of the reinforcing plate 54 in the Y direction and the vertical direction Z is preferably approximately the same as the length of the lower holder 51 in the Y direction and the vertical direction Z. However, the lengths in the vertical direction Z do not have to be the same. Furthermore, the position of the reinforcing plate 54 is not limited to the above, and it may be located at a position different from the fastening portion 53A in the X direction as long as it protrudes beyond the fastening portion 53A in the Y direction.

[0117] The distance S between adjacent fastening portions 53A in the direction X ４ is determined based on the radius R of the pole crushing plunger P when it is assumed that the pole crushing plunger P collides from the direction Y. Specifically, the interval S ４ is determined by the following formula, where r is the radius of the hole of the fastening portion 53A.

[0118]

[0119] With the above configuration, when the pole crushing pusher P collides from one side in direction Y, the pole crushing pusher P is prevented from entering by the fixing devices fastened at the fastening portions 53A and the fixing devices fastened at the fastening portions 53A.

[0120] This disclosure assumes a side collision of a vehicle (or electronic device). Therefore, a collision test in direction Y is conducted on the energy storage module using a pole crushing plunger P. As shown in Fig. 18 , an impact load is applied to the energy storage module from the right side in direction Y using the pole crushing plunger P.

[0121] For example, when the pole crushing pusher P collides with the fastening portion 53A, since the reinforcing plate 54 is provided along the direction Y of the fastening portion 53A, the strength of the portion where the fastening portion 53A is formed in the direction X is improved, and the impact load acting on the electricity storage device 60 is small. Also, when the pole crushing pusher P collides between the fastening portions 53A, the interval S between the fastening portions 53A is reduced.４ Since the distance between the pole crushing plunger P and the fastening portion 53A is determined as described above, the pole crushing plunger P is prevented from entering by the fastening device fastened at the fastening portion 53A and the fastening device fastened at the fastening portion 53A.

[0122] According to the electricity storage module, even when an impact load is applied during a side collision of the vehicle, the load acting on the electricity storage device 60 can be reduced, thereby increasing the load resistance of the electricity storage module.

[0123] It should be noted that the present disclosure is not limited to the above-described embodiments and their variations, and it goes without saying that various modifications and improvements are possible within the scope of the matters described in the claims of the present application.

[0124] 9 Upper holder, 10 Energy storage module, 11 Lower holder (holder), 12 Main body, 12A Storage section, 13 Outer periphery, 13A Fastening section, 14 Gap, 14A Gap (first gap), 14B Gap (second gap), 14C Gap (third gap), 15 Support section, 16 Weak section (second weak section), 17 Weak section (third weak section), 20 Energy storage module, 21 Lower holder (holder), 22 Main body, 22A Storage section, 23 Outer periphery, 23A Fastening section, 24 Gap, 24A Gap (first gap), 24B Gap (second gap), 24C Gap (third gap), 26 Weak section (second weak section), 27 Weak section (third weak section), 28 First leaf spring, 29 Second leaf spring, 30 REFERENCE SIGNS LIST, 31 lower holder (holder), 32 main body, 32A accommodation portion, 33 outer periphery, 33A fastening portion, 34 gap, 34A gap (first gap), 34B gap (second gap), 34C gap (third gap), 35 leaf spring, 36 fragile portion (second fragile portion), 37 fragile portion (third fragile portion), 41 lower holder (holder), 42A accommodation portion, 43A fastening portion, 51 lower holder (holder), 52A accommodation portion, 53A fastening portion, 54 reinforcing plate, 60 electricity storage device, 61 positive electrode, 62 negative electrode, 63 separator, 64 electrode group, 65 outer can, 65A groove portion, 66 sealing body, 67 positive electrode lead, 68 negative electrode lead, 69 gasket, 70 insulating plate, 140 Electricity storage pack, 141 housing, 143A fastening portion, 144 heat exchange member, 240 vehicle, 241 holder, 241A fastening portion, 242A accommodation portion, 243 heat exchange member, 245 exhaust duct, 246 heat exchange member, 247 heat conductive material

Claims

1. At least one cylindrical storage device; A holder for holding the electricity storage device in an axial direction; Equipped with the holder has a main body including a housing portion that holds the power storage device, and an outer periphery that surrounds the main body with a gap provided between the main body and the outer periphery; When a direction perpendicular to an axial direction of the power storage device is defined as a first direction, and a direction perpendicular to the axial direction and the first direction is defined as a second direction, a shock absorbing portion is provided in a first gap between the main body and the outer circumferential portion in the first direction. Energy storage module.

2. The energy storage module according to claim 1 , The shock absorbing portion includes a plurality of support portions that respectively connect a first connection portion of the outer circumferential portion and a plurality of second connection portions of the main body that are arranged in the axial direction of the power storage device and in the second direction, Energy storage module.

3. The storage module according to claim 2, Each of the plurality of support portions extends at an angle so as to intersect with the first direction. Energy storage module.

4. The storage module according to claim 3, A plurality of fastening portions for fastening the holder are formed on the outer periphery, The plurality of fastening portions are arranged side by side in the second direction, The first connection portion is provided between a pair of adjacent fastening portions among the plurality of fastening portions. Energy storage module.

5. The storage module according to claim 4, A first weak portion is provided between one of the pair of adjacent fastening portions and the first connection portion. Energy storage module.

6. The storage module according to claim 2, A second weak portion connecting the outer circumferential portion and the main body is formed in a second gap between the main body and the outer circumferential portion in the second direction among the gaps. Energy storage module.

7. The storage module according to claim 2, The holder has a plurality of the bodies, The plurality of bodies are arranged side by side in the second direction with a third gap provided therebetween, A third weak portion connecting the main bodies to each other is formed in the third gap. Energy storage module.

8. The energy storage module according to any one of claims 2 to 7, The outer periphery is cylindrical. Energy storage module.

9. The energy storage module according to claim 1 , The shock absorbing portion includes a first leaf spring constituting a portion of the outer circumferential portion along the second direction, and a second leaf spring connecting the first leaf spring to a pair of second connection portions of the main body arranged in the second direction, Energy storage module.

10. The energy storage module according to claim 9, A plurality of fastening portions for fastening the holder are formed on the outer circumferential portion and are arranged in the second direction, and the first leaf spring is disposed between a pair of adjacent fastening portions among the plurality of fastening portions and is connected to the pair of fastening portions. Energy storage module.

11. The energy storage module according to claim 9, The first leaf spring and the second leaf spring are connected to each other at a first connecting portion, In the first leaf spring, a first weak portion is formed between the first connecting portion and one of the pair of fastening portions. Energy storage module.

12. The energy storage module according to claim 9, A second weak portion connecting the outer circumferential portion and the main body is formed in a second gap between the main body and the outer circumferential portion in the second direction among the gaps. Energy storage module.

13. The energy storage module according to claim 9, The holder has a plurality of the bodies, The plurality of bodies are arranged side by side in the second direction with a third gap provided therebetween, A third weak portion connecting the main bodies to each other is formed in the third gap. Energy storage module.

14. The energy storage module according to any one of claims 9 to 13, The outer periphery is cylindrical. Energy storage module.

15. The energy storage module according to claim 1 , The shock absorbing portion includes an arch-shaped leaf spring connected to a first connection portion of the outer circumferential portion and a pair of second connection portions of the power storage device of the main body arranged in the second direction, Energy storage module.

16. The energy storage module according to claim 15, A plurality of fastening portions for fastening the holders arranged in the second direction are formed in the outer circumferential portion, The first connection portion is provided between a pair of adjacent fastening portions among the plurality of fastening portions. Energy storage module.

17. The energy storage module according to claim 16, A first weak portion is provided between one of the pair of adjacent fastening portions and the first connection portion. Energy storage module.

18. The energy storage module according to claim 15, A second weak portion connecting the outer circumferential portion and the main body is formed in a second gap between the main body and the outer circumferential portion in the second direction among the gaps. Energy storage module.

19. The energy storage module according to claim 15, The holder has a plurality of the bodies, The plurality of bodies are arranged side by side in the second direction with a third gap provided therebetween, A third weak portion connecting the main bodies to each other is formed in the third gap. Energy storage module.

20. The energy storage module according to claim 15, The outer periphery is cylindrical. Energy storage module.

21. The energy storage module according to any one of claims 15 to 20, The leaf spring abuts against the outer circumferential portion at the first connection portion. Energy storage module.