Power storage module

Abstract

This electricity storage module is provided with: at least one cylindrical electricity storage device (60); and a lower holder (11) that holds the power storage device (60) in the axial direction (Z) of the power storage device (60), the lower holder (11) having: a main body (12) that includes a housing section (12A) that holds the power storage device (60); and an outer peripheral section (13) that surrounds the main body (12) with a gap (14) provided between the main body (12) and the outer peripheral section (13), and when a direction orthogonal to an axial direction (Z) of the electricity storage device (60) is defined as a direction (Y) and a direction orthogonal to both the axial direction and the direction (Y) is defined as a direction (X), a shock-absorbing section is provided in a gap (14A) located between the main body (12) and the outer peripheral section (13) in the direction (Y) of the gap (14).

Description

Technical Field

[0001] The present invention relates to an electricity storage module, and more particularly to a structure of a holder for holding an electricity storage device. Background Art

[0002] The power storage module is used as a power source having a plurality of power storage devices. In addition, the power storage module is sometimes mounted on a vehicle. In a vehicle-mounted power storage module, when an impact load is applied, for example, during a side collision of the vehicle, there is a risk that the load is applied to the power storage device, causing the power storage device to deform, thereby making the power storage device unsafe. For example, Patent Document 1 discloses a technology in which, during a side collision of the vehicle, a retaining member is broken by a recessed shape provided on the retaining member, thereby preventing the load from being applied to the power storage device.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-156320 Summary of the invention

[0006] Furthermore, in a vehicle-mounted 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.

[0007] Therefore, an object of the present invention is to provide a power storage module capable of reducing the load applied to a power storage device when an impact load is applied.

[0008] The present invention provides an electricity storage module, characterized in that the electricity storage module comprises: at least one cylindrical electricity storage device; and a retaining member that retains the electricity storage device along the axial direction of the electricity storage device, the retaining member having: a main body that includes a storage portion that retains the electricity storage device; and a peripheral portion that surrounds the main body with a gap between the main body and the peripheral portion, and when a direction orthogonal to the axial direction of the electricity storage device is set as a first direction and a direction orthogonal to both the axial direction and the first direction is set as a second direction, an impact buffer portion is provided in a first gap in the gap that is located between the main body and the peripheral portion in the first direction.

[0009] According to the power storage module of the present invention, it is possible to reduce the load applied to the power storage device when an impact load is applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view showing the power storage module according to the first embodiment.

[0011] Figure 2 It is a plan view showing the power storage module according to the first embodiment.

[0012] Figure 3It is a schematic diagram showing an electricity storage device.

[0013] Figure 4A It is a top view showing the functions and effects of the electricity storage module of the first embodiment.

[0014] Figure 4B It is showing Figure 4A The subsequent top view of.

[0015] Figure 4C It is showing Figure 4B The subsequent top view of.

[0016] Figure 5 It is a perspective view showing the electricity storage module of the second embodiment.

[0017] Figure 6 It is a top view showing the electricity storage module of the second embodiment.

[0018] Fig. 7A It is a top view showing the functions and effects of the electricity storage module of the second embodiment.

[0019] Figure 7B It is showing Fig. 7A The subsequent top view of.

[0020] Figure 7C It is showing Figure 7B The subsequent top view of.

[0021] Figure 8 It is a perspective view showing the electricity storage module of the third embodiment.

[0022] Fig. 9 It is a top view showing the electricity storage module of the third embodiment.

[0023] Fig. 10A It is a top view showing the functions and effects of the electricity storage module of the third embodiment.

[0024] Fig. 10B It is showing Fig. 10A The subsequent top view of.

[0025] Fig. 10C It is showing Fig. 10B The subsequent top view of.

[0026] Fig.11 It is a perspective view showing the lower holding member of the fourth embodiment.

[0027] Fig.12 It is a top view showing the pole crush pusher (Japanese: ポール圧壊押子) of the fourth embodiment.

[0028] Fig.13It is a plan view showing the operation and effects of the power storage module according to the fourth embodiment.

[0029] Fig.14 It is a plan view showing a battery pack according to a fourth embodiment.

[0030] Fig.15 It is a top cross-sectional view of a vehicle showing a fourth embodiment.

[0031] Fig.16 yes Fig.15 AA section view.

[0032] Fig.17 It is a perspective view showing a lower holder according to a fifth embodiment.

[0033] Fig.18 It is a plan view showing the operation and effects of the power storage module according to the fifth embodiment. DETAILED DESCRIPTION

[0034] <0. Overview of implementation>

[0035] In the following description, specific shapes, materials, directions, numerical values, etc. are illustrative for easy understanding of the present invention and can be appropriately changed according to the application, purpose, specification, etc.

[0036] Five embodiments of the power storage module are described below. The power storage module of each embodiment has a different structure of the lower retainer. According to the power storage module, the load applied to the power storage device when an impact load is applied can be reduced, which will be described in detail later.

[0037] Hereinafter, in each embodiment, the same reference numerals are used for the components identical to those in other embodiments. In addition, in each embodiment, corresponding components marked with reference numerals different from those in other embodiments are deemed to be identical to those in other embodiments unless otherwise specified.

[0038] In the following description, the axial direction of a cylindrical power storage device described later in the power storage module is referred to as the vertical direction Z, the direction orthogonal to the vertical direction Z is referred to as the direction Y, and the direction orthogonal to both the vertical direction Z and the direction Y is referred to as the direction X.

[0039] 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. In addition, the power storage module is not limited to being mounted on an electric vehicle, and can also be used as a power source for electric devices driven by motors, such as electric tools, electric assisted bicycles, electric motorcycles, electric wheelchairs, electric tricycles, and electric scooters. In addition, the use of the power storage module is not limited, and can also be used as a power source for various electrical devices used indoors and outdoors, such as cleaners, wireless devices, lighting devices, digital cameras, and video cameras.

[0040] The power storage module of each embodiment may be provided in a power storage pack. A power storage pack is a power source provided in the body of an electric vehicle and having a plurality of power storage modules arranged inside a casing. In addition, the power storage module of each embodiment may also be provided in the body of the vehicle.

[0041] <1-1. Configuration of power storage module according to first embodiment>

[0042] use Figure 1 to Figure 4C The structure of the power storage module 10 according to the first embodiment will be described.

[0043] like Figure 1 and Figure 2 As shown, the power storage module 10 includes a plurality of cylindrical power storage devices 60 , an upper holder 9 that holds the upper sides of the plurality of power storage devices 60 in the vertical direction Z, and a lower holder 11 that holds the lower sides of the plurality of power storage devices 60 .

[0044] Alternatively, in consideration of safety, multiple power storage devices 60 may be filled most densely into the power storage module 10, 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 may be arranged such that six power storage devices 60 surround one power storage device 60 (or arranged in a staggered manner).

[0045] like Figure 3 As shown, in this example, a cylindrical lithium-ion secondary battery is used for the power storage device 60, but a nickel-hydrogen battery, a capacitor, etc. may also be used. The power storage device 60 includes, for example, an electrode group 64 formed by winding a strip-shaped positive electrode 61 and a strip-shaped negative electrode 62 with a strip-shaped separator 63 interposed therebetween; a cylindrical outer can 65 that houses the electrode group 64 together with an electrolyte; a sealing body 66 that seals the opening of the outer can 65 in a state of insulating the opening of the outer can 65; 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 arranged between the outer periphery of the sealing body 66 and the inner peripheral surface of the opening of the outer can 65.

[0046] An annular groove 65A is formed on the outer peripheral surface of the outer can 65 on the side of the opening. The groove 65A is formed as an annular convex portion on the inner peripheral surface of the outer can 65. The gasket 69 and the sealing body 66 are arranged on the annular convex portion in the outer can 65. In addition, the opening end of the outer can 65 is caulked in a manner that it is tilted toward the inside of the outer can 65 with the gasket 69 arranged on the inner peripheral side. The sealing body 66 is clamped in the axial direction by the caulked opening end and the convex portion through the gasket 69, thereby closing the opening of the outer can 65.

[0047] A current interrupting device (CID) or a vent valve that ruptures when the pressure in the outer can 65 reaches a predetermined pressure or more may be provided in the sealing body 66. In addition, 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 convex portion (groove portion 65A). When the insulating plate 70 is provided, the positive lead 67 may extend through the through hole formed in the insulating plate 70. The negative lead 68 may extend through the through hole formed in the insulating plate 70 or extend around the insulating plate 70. In the power storage device 60, as described above, the positive terminal may be configured as the top surface of the sealing body 66, and the negative terminal may be configured as the shoulder portion of the outer can 65 that is clamped.

[0048] Again Figure 1 and Figure 2 As shown, the upper holder 9 holds the upper sides of the plurality of power storage devices 60 as described above. The upper holder 9 is formed of, for example, a thermoplastic resin. Thermoplastic resins are roughly divided into general-purpose plastics and engineering plastics, and polyethylene, polypropylene, polyamide, ABS, etc. can be used.

[0049] The lower holder 11 as a holder holds the lower sides of the plurality of power storage devices 60 as described above. 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 parts of the plurality of power storage devices 60. The lower holder 11 is formed of, for example, a thermoplastic resin, similarly to the upper holder 9.

[0050] The lower holder 11 includes 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 body 12 with a gap 14 between the main body 12. In the lower holder 11 of the present embodiment, two main bodies 12 are arranged in the direction X, but the present invention is not limited thereto. Three or more main bodies 12 may be arranged in the direction X, and two or more main bodies 12 may be arranged in the direction Y.

[0051] The main body 12 is formed in a substantially rectangular shape when viewed from the up-down direction Z, and all corners thereof are formed in arc shapes. The main body 12 is formed with a storage portion 12A for storing a plurality of power storage devices 60. The storage portion 12A is formed in a circular shape when viewed from the up-down direction Z. The middle portion and the lower portion of the power storage device 60 are fitted into the storage portion 12A.

[0052] The peripheral portion 13 is formed to surround the main body 12 with a gap 14 between the main body 12 as described above. The peripheral portion 13 is formed into a rectangular cylindrical shape when viewed from the up-down direction Z. For the peripheral portion 13 of the present embodiment, since two main bodies 12 are arranged in the direction X, the peripheral portion 13 is formed into a rectangular frame with the direction X as the length direction when viewed from the up-down direction Z. The length of the peripheral portion 13 in the up-down direction Z is substantially the same as the length of the main body 12 in the up-down direction Z. In addition, in the present embodiment, the peripheral portion 13 is a cylindrical wall, but is not limited to this. For example, the peripheral portion 13 may also be a plurality of walls extending along the direction X and arranged to sandwich the main body 12 in the direction Y.

[0053] The outer peripheral portion 13 has a plurality of fastening portions 13A arranged in the direction X. For example, a fastening portion 13A for fastening the lower retainer 11 to the power storage group (not shown) is formed at a position of the outer peripheral portion 13 corresponding to the corner of the main body 12. Six fastening portions 13A are formed in the outer peripheral portion 13. The lower retainer 11 of the present embodiment is fastened and fixed to the power storage group by a fixing member such as a bolt. In addition, the lower retainer 11 can also be fastened and fixed to the body of the vehicle by a fixing member such as a bolt. The fastening portion 13A can be cylindrical, and has an internal thread portion with thread teeth formed on the inner peripheral surface to be fastened with a bolt with high rigidity. The internal thread portion becomes a member with high rigidity so as to withstand the fastening of the bolt. Therefore, the fastening portion 13A becomes a portion with particularly high rigidity in the outer peripheral portion 13. In addition, the fastening portion 13A is fastened and fixed to the member or body of the power storage group as described above, and therefore, it is particularly difficult to be displaced in the power storage module 10.

[0054] As described above, the gap 14 is a gap portion formed between the main body 12 and the outer peripheral portion 13. The gap 14 includes a first gap 14A, a second gap 14B, and a third gap 14C, each of which will be described in detail later.

[0055] The gap 14A as the first gap is formed between the main body 12 and the peripheral portion 13 in the direction Y. According to the gap 14A, when an impact load is applied from one side of the peripheral portion 13 in the direction Y during a side collision of a vehicle (or electronic device), the gap 14A on the other side becomes a retreat margin portion of the main body 12, which will be described in detail later. Therefore, the main body 12 can move to the other side in the direction Y in the peripheral portion 13. A support portion 15 described in detail later is formed in the gap 14A.

[0056] A plurality of support portions 15 connect a plurality of second connection portions of the main body 12 arranged in the direction X to the first connection portion of the peripheral portion 13 when viewed from the up-down direction Z. More specifically, the support portions 15 extend obliquely in a manner intersecting the direction Y and are connected to a portion of the peripheral portion 13 that is opposite to 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 up-down direction Z. In addition, the support portions 15 are respectively provided at both ends of the Y direction relative to the main body 12. In addition, adjacent support portions 15 may be integrated with each other or may be respectively connected to different first connection portions. The length of the support portion 15 in the up-down direction Z is substantially the same as the length of the main body 12 and the peripheral portion 13 in the up-down direction Z. In addition, the support portion 15 may also be formed in the gap 14B. However, the above-mentioned lengths in the up-down direction Z may also be different.

[0057] According to the support portion 15, 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 impact load can be dispersed from the outer peripheral portion 13 to the main body 12. In addition, the impact load can be dispersed to both ends of the main body 12 in the direction X where the power storage device 60 is not arranged, so that the main body 12 can be pushed in the direction Y without applying a load to the power storage device 60.

[0058] The gap 14B as the second gap is formed between the main body 12 and the outer peripheral portion 13 in the direction X. The gap 14B is formed so that 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 inside the outer peripheral portion 13 toward the other side in the direction Y. A fragile portion 16 described in detail later is formed in the gap 14B.

[0059] The fragile portion 16 as the second fragile portion connects the main body 12 and the outer peripheral portion 13 in the direction X. When the main body 12 attempts to move relative to the outer peripheral portion 13 in the direction Y, if a predetermined stress or more is generated, the fragile portion 16 breaks.

[0060] The gap 14C as the third gap is formed between the main body 12 and the adjacent main body 12. The gap 14C is formed so that 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 inside the outer peripheral portion 13 toward the other side in the direction Y. The fragile portion 17 described in detail later is formed in the gap 14C.

[0061] The fragile portion 17 as the third fragile portion connects the main body 12 and the main body 12 in the direction X. When the main body 12 attempts to move relative to the main body 12 in the direction Y, if a predetermined stress or more is generated, the fragile portion 17 breaks.

[0062] In the present invention, a side collision of a vehicle (or electronic device) equipped with the power storage module 10 is assumed. Therefore, a collision test in the direction Y is performed on the power storage module 10 using a column crushing push piece P. Figure 4A As shown, the impact load is applied to the power storage module 10 from one side in the direction Y by the column crushing pusher P.

[0063] At this time, an impact load acts on one side of the outer peripheral portion 13 of the lower retainer 11 in the direction Y. Under the action of this load, the outer peripheral portion 13 is pushed, the support portion 15 is pushed by the outer peripheral portion 13, and the two end portions of the main body 12 in the direction X are pushed by the support portions 15 respectively.

[0064] In addition, a first fragile portion that is weaker than the support portion 15 is provided at a portion of the outer peripheral portion 13 that is located between the first connecting portion and the fastening portion 13A in the direction X. Figure 4B As shown, under the impact load of the column crushing the push piece P, the peripheral portion 13 breaks at the first fragile portion. In addition, as described above, since the end of the main body 12 in the direction X is pushed, the main body 12 moves to the other side in the direction Y. Since the main body 12 moves to the other side in the direction Y, the fragile portions 16 and 17 break, and the peripheral portion 13 on the other side in the direction Y breaks at the first fragile portion. At this time, for the main body 12, since the gap 14A on the other side in the direction Y has a retreat margin, it is possible to prevent the main body 12 from being crushed by the impact load. And, as Figure 4C As shown, the support portion 15 is broken.

[0065] According to the power storage module 10, even when an impact load is applied, the impact load can be absorbed by the lower retainer 11 by the two-stage rupture formed by the rupture of the outer peripheral portion 13 and the rupture of the support portion 15, and the provision of the gap 14A to ensure the escape margin of the main body 12, thereby reducing the load applied to the power storage device 60. As a result, the load-bearing capacity of the power storage module 10 can be improved.

[0066] <2-1. Configuration of power storage module according to second embodiment>

[0067] use Figure 5 to Figure 7C The structure of the power storage module 20 according to the second embodiment will be described.

[0068] like Figure 5 and Figure 6 As shown, the power storage module 20 includes a plurality of cylindrical power storage devices 60, an upper retainer 9 that holds the upper sides of the plurality of power storage devices 60 in the up-down direction Z, and a lower retainer 21 that serves as a retainer that holds the lower sides of the plurality of power storage devices 60. The power storage devices 60 and the upper retainer 9 have the same structure as in the first embodiment, and therefore description thereof will be omitted.

[0069] The lower holder 21 as a holder holds the lower sides of the plurality of power storage devices 60 as described above. 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 parts of the plurality of power storage devices 60. The lower holder 21 is formed of, for example, a thermoplastic resin, similarly to the upper holder 9.

[0070] The lower holder 21 includes a plurality of main bodies 22 that respectively hold a plurality of power storage devices 60, and an outer peripheral portion 23 that surrounds the main body 22 with a gap 24 between the main body 22. In the lower holder 21 of the present embodiment, two main bodies 22 are arranged in the direction X, but the present invention is not limited thereto. Three or more main bodies 22 may be arranged in the direction X, and two or more main bodies 22 may be arranged in the direction Y.

[0071] The main body 22 is formed in a substantially rectangular shape when viewed from the up-down direction Z, and all corners thereof are formed in arc shapes. The main body 22 is formed with a storage portion 22A for storing a plurality of power storage devices 60. The storage portion 22A is formed in a circular shape when viewed from the up-down direction Z. The middle portion and the lower portion of the power storage device 60 are fitted into the storage portion 22A.

[0072] The peripheral portion 23 is formed to surround the main body 22 with a gap 24 between the main body 22 as described above. The peripheral portion 23 is formed into a rectangular cylindrical shape when viewed from the up-down direction Z. For the peripheral portion 23 of the present embodiment, since two main bodies 22 are arranged in the direction X, the peripheral portion 23 is formed into a rectangular frame with the direction X as the length direction when viewed from the up-down direction Z. The length of the peripheral portion 23 in the up-down direction Z is substantially the same as the length of the main body 22 in the up-down direction Z. In addition, in the present embodiment, the peripheral portion 23 is a cylindrical wall, but is not limited to this. For example, the peripheral portion 23 may also be a plurality of walls extending along the direction X and arranged to sandwich the main body 22 in the direction Y.

[0073] The outer peripheral portion 23 has a plurality of fastening portions 23A arranged in the direction X. For example, a fastening portion 23A for fastening the lower retainer 21 to the power storage group (not shown) is formed at a position of the outer peripheral portion 23 corresponding to the corner of the main body 22. Six fastening portions 23A are formed in the outer peripheral portion 23. The lower retainer 21 of the present embodiment is fastened and fixed to the power storage group by a fixing member such as a bolt. In addition, the lower retainer 21 can also be fastened and fixed to the body of the vehicle by a fixing member such as a bolt. The fastening portion 23A can be cylindrical, and has an internal thread portion with thread teeth formed on the inner peripheral surface to be fastened with a bolt with high rigidity. The internal thread portion becomes a member with high rigidity so as to withstand the fastening of the bolt. Therefore, the fastening portion 23A becomes a part with particularly high rigidity in the outer peripheral portion 23. In addition, the fastening portion is fastened and fixed to the member or body of the power storage group as described above, and therefore, it is particularly difficult to be displaced in the power storage module 20.

[0074] The portion of the outer peripheral portion 23 along the direction X is composed of a member capable of suppressing buffering and vibration, for example, a first leaf spring 28. The first leaf spring 28 is plate-shaped and is formed of a metal plate such as iron, stainless steel, copper, etc., and has a spring characteristic greater than or equal to a predetermined value. In addition, the first leaf spring 28 and the second leaf spring 29 can be fixed to each other at the first connecting portion by a clamp or the like.

[0075] As described above, the gap 24 is a gap portion formed between the main body 22 and the outer peripheral portion 23. The gap 24 includes a first gap 24A, a second gap 24B, and a third gap 24C, which are described in detail below.

[0076] The gap 24A as the first gap is formed between the main body 22 and the outer peripheral portion 23 in the direction Y. According to the gap 24A, when an impact load is applied from one side of the outer peripheral portion 23 in the direction Y during a vehicle collision, the gap 24A on the other side becomes a retreat margin portion of the main body 22, which will be described in detail later. Therefore, the main body 22 can move to the other side in the direction Y in the outer peripheral portion 23. A second leaf spring 29 described in detail later is formed in the gap 24A.

[0077] The second leaf spring 29 is plate-shaped and is formed of a metal plate such as iron, stainless steel, copper, etc., and has a spring characteristic greater than or equal to a predetermined value. The second leaf spring 29 is, for example, composed of a V-shaped plate protruding toward the outer peripheral portion 23. However, the second leaf spring 29 may also have a flat surface at the first connecting portion connected to the first leaf spring 28. The second leaf spring 29 is connected to a pair of second connecting portions of the main body 22 arranged along the direction X. More specifically, the second leaf spring 29 connects the end portions of the main body 22 in the direction X when viewed from the up-down direction Z and the portion of the outer peripheral portion 23 that is opposite to the central portion of the main body 22 in the direction X. In other words, the second leaf spring 29 forms a truss structure when viewed from the up-down direction Z. The length of the second leaf spring 29 in the up-down direction Z is substantially the same as the length of the main body 22 and the outer peripheral portion 23 in the up-down direction Z. However, the above-mentioned lengths in the up-down direction Z may also be different.

[0078] According to the second leaf spring 29, 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 impact load can be absorbed, which will be described later. In addition, the impact load can be dispersed to the second connecting portion of the main body 22 arranged in the direction X where the power storage device 60 is not arranged, so that the main body 22 can be pushed in the direction Y without applying a load to the power storage device 60.

[0079] Furthermore, the present invention is not limited to the present embodiment, and the first leaf spring 28 may be formed in a portion along the direction Y in the outer peripheral portion 23 , and the second leaf spring 29 may be provided in the gap 24B.

[0080] The gap 24B as the second gap is formed between the main body 22 and the outer peripheral portion 23 in the direction X. The gap 24B is formed so that 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 inside the outer peripheral portion 23 toward the other side in the direction Y. A fragile portion 26 described in detail later is formed in the gap 24B.

[0081] The fragile portion 26 as the second fragile portion connects the main body 22 and the outer peripheral portion 23 in the direction X. When the main body 22 attempts to move relative to the outer peripheral portion 23 in the direction Y, if a predetermined stress or more is generated, the fragile portion 26 breaks.

[0082] The gap 24C as the third gap is formed between the main body 22 and the adjacent main body 22. The gap 24C is formed so that 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 inside the outer peripheral portion 23 toward the other side in the direction Y. The fragile portion 27 described in detail later is formed in the gap 24C.

[0083] The fragile portion 27 as the third fragile portion connects the main body 22 and the main body 22 in the direction X. When the main body 22 attempts to move relative to the main body 22 in the direction Y, if a predetermined stress or more is generated, the fragile portion 27 breaks.

[0084] In the present invention, a side collision of a vehicle (or electronic device) equipped with the power storage module 20 is assumed. Therefore, a collision test in the direction Y is performed on the power storage module 20 using a column crushing push piece P. Fig. 7A As shown, the impact load is applied to the power storage module 20 from one side in the direction Y by the column crushing pusher P.

[0085] At this time, an impact load acts on one side of the outer peripheral portion 23 of the lower retainer 21 in the direction Y. Under the action of this load, the first leaf spring 28 is pushed, the second leaf spring 29 is pushed by the first leaf spring 28, and the second connection portion of the main body 22 is pushed by the second leaf spring 29.

[0086] In addition, a first fragile portion that is weaker than the second leaf spring 29 is provided at a portion of the outer peripheral portion 23 located between the first connecting portion and the fastening portion 23A in the direction X. Figure 7B As shown, under the impact load of the column crushing the push piece P, the outer peripheral portion 23 breaks at the first fragile portion. In addition, as described above, since the second connecting portion of the main body 22 is pushed, the main body 22 moves to the other side of the direction Y. Since the main body 22 moves to the other side of the direction Y, the fragile portions 26 and 27 break, and the first fragile portion of the outer peripheral portion 23 on the other side of the direction Y breaks. At this time, for the main body 22, since the gap 24A on the other side of the direction Y has a retreat margin, the main body 22 will not be crushed by the impact load. And, as Figure 7C As shown, the second leaf spring 29 is deformed and bent.

[0087] According to the power storage module 20, even when an impact load is applied, the impact load can be absorbed by the lower retainer 21 due to the breakage of the first leaf spring from the outer peripheral portion 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 the escape margin of the main body 22, thereby reducing the load applied to the power storage device 60. As a result, the load-bearing capacity of the power storage module 20 can be improved.

[0088] <3-1. Configuration of Power Storage Module According to Third Embodiment>

[0089] use Figure 8 to Figure 10C The structure of the power storage module 30 according to the third embodiment will be described.

[0090] like Figure 8 and Fig. 9As shown, the power storage module 30 includes a plurality of cylindrical power storage devices 60, an upper retainer 9 that holds the upper sides of the plurality of power storage devices 60 in the up-down direction Z, and a lower retainer 31 that serves as a retainer that holds the lower sides of the plurality of power storage devices 60. The power storage devices 60 and the upper retainer 9 have the same structure as in the first embodiment, and therefore description thereof is omitted.

[0091] The lower retainer 31 as a retainer holds the lower sides of the plurality of power storage devices 60 as described above. The length of the lower retainer 31 in the vertical direction Z is sufficiently longer than the length of the upper retainer 9 in the vertical direction Z. Therefore, the lower retainer 31 holds the middle and lower parts of the plurality of power storage devices 60. The lower retainer 31 is formed of, for example, a thermoplastic resin, similarly to the upper retainer 9.

[0092] The lower holder 31 includes 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 body 32 with a gap 34 between the main body 32. In the lower holder 31 of the present embodiment, two main bodies 32 are arranged in the direction X, but the present invention is not limited thereto. Three or more main bodies 32 may be arranged in the direction X, and two or more main bodies 32 may be arranged in the direction Y.

[0093] The main body 32 is formed in a substantially rectangular shape when viewed from the up-down direction Z, and all corners thereof are formed in arc shapes. The main body 32 is formed with a storage portion 32A for storing a plurality of power storage devices 60. The storage portion 32A is formed in a circular shape when viewed from the up-down direction Z. The middle portion and the lower portion of the power storage device 60 are fitted into the storage portion 32A.

[0094] The peripheral portion 33 is formed to surround the main body 32 with a gap 34 between the main body 32 as described above. The peripheral portion 33 is formed into a rectangular cylindrical shape when viewed from the up-down direction Z. For the peripheral portion 33 of the present embodiment, since two main bodies 32 are arranged in the direction X, the peripheral portion 33 is formed into a rectangular frame with the direction X as the length direction when viewed from the up-down direction Z. The length of the peripheral portion 33 in the up-down direction Z is substantially the same as the length of the main body 32 in the up-down direction Z. In addition, in the present embodiment, the peripheral portion 33 is a cylindrical wall, but is not limited to this. For example, the peripheral portion 33 may also be a plurality of walls extending along the direction X and arranged to sandwich the main body 32 in the direction Y.

[0095] The outer peripheral portion 33 has a plurality of fastening portions 33A arranged in the direction X. For example, a fastening portion 33A for fastening the lower retainer 31 to the power storage group (not shown) is formed at a position of the outer peripheral portion 33 corresponding to the corner of the main body 32. Six fastening portions 33A are formed in the outer peripheral portion 33. The lower retainer 31 of this embodiment is fastened and fixed to the power storage group by a fixing member such as a bolt. In addition, the lower retainer 31 can also be fastened and fixed to the body of the vehicle by a fixing member such as a bolt. The fastening portion 33A can be cylindrical, and has an internal thread portion with thread teeth formed on the inner peripheral surface to be fastened with a bolt with high rigidity. The internal thread portion becomes a member with high rigidity so as to withstand the fastening of the bolt. Therefore, the fastening portion 33A becomes a part with particularly high rigidity in the outer peripheral portion 33. In addition, the fastening portion is fastened and fixed to the member or body of the power storage group as described above, and therefore, it is particularly difficult to be displaced in the power storage module 30.

[0096] As described above, the gap 34 is a gap portion formed between the main body 32 and the outer peripheral portion 33. The gap 34 includes a first gap 34A, a second gap 34B, and a third gap 34C, which are described in detail below.

[0097] The gap 34A as the first gap is formed between the main body 32 and the outer peripheral portion 33 in the direction Y. According to the gap 34A, when an impact load is applied from one side of the outer peripheral portion 33 in the direction Y during a collision of a vehicle (or an electronic device), the gap 34A on the other side becomes a retreat margin portion of the main body 32, which will be described in detail later. Therefore, the main body 32 can move to the other side in the direction Y within the outer peripheral portion 33. An arch-shaped leaf spring 35 described in detail later is provided in the gap 34A.

[0098] The leaf spring 35 is plate-shaped and is formed of a metal plate such as iron, stainless steel, copper, etc., and has a spring characteristic that is greater than or equal to a predetermined value. The leaf spring 35 is formed into an arch shape that bulges outward in the direction Y when viewed from the up-down direction Z. The two ends of the leaf spring 35 in the direction X are respectively fixed to a plurality of second connecting portions of the main body 32 arranged in the direction X. In addition, the leaf spring 35 can abut against and push the first connecting portion. The length of the leaf spring 35 in the up-down direction Z is substantially the same as the length of the main body 32 and the peripheral portion 33 in the up-down direction Z. In addition, the leaf spring 35 can also be provided in the second gap 34B. However, the lengths in the up-down direction Z can also be different.

[0099] According to the leaf spring 35, 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 impact load can be absorbed. In addition, the impact load can be dispersed to the second connection portion of the main body 32 arranged in the direction X where the power storage device 60 is not arranged, so that the main body 32 can be pushed in the direction Y without applying the impact load to the power storage device 60.

[0100] The gap 34B as the second gap is formed between the main body 32 and the outer peripheral portion 33 in the direction X. The gap 34B is formed so that 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 inside the outer peripheral portion 33 toward the other side in the direction Y. A fragile portion 36 described in detail later is formed in the gap 34B.

[0101] The fragile portion 36 as the second fragile portion connects the main body 32 and the outer peripheral portion 33 in the direction X. When the main body 32 attempts to move relative to the outer peripheral portion 33 in the direction Y, if a predetermined stress or more is generated, the fragile portion 36 breaks.

[0102] A gap 34C as a third gap is formed between the main body 32 and the main body 32. The gap 34C is formed so that 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 inside the outer peripheral portion 33 toward the other side in the direction Y. A fragile portion 37 described in detail later is formed in the gap 34C.

[0103] The fragile portion 37 as the third fragile portion connects the main body 32 and the main body 32 in the direction X. When the main body 32 attempts to move relative to the main body 32 in the direction Y, if a predetermined stress or more is generated, the fragile portion 37 breaks.

[0104] In the present invention, a side collision of a vehicle (or electronic device) equipped with the power storage module 30 is assumed. Therefore, a collision test in the direction Y is performed on the power storage module 30 using a column crushing push piece P. Fig. 10A As shown, the impact load is applied to the power storage module 30 from one side in the direction Y by the column crushing pusher P.

[0105] At this time, an impact load acts on the right side of the outer peripheral portion 33 of the lower retainer 31 in the direction Y. Under the action of this load, the outer peripheral portion 33 is pushed, the leaf spring 35 is pushed by the outer peripheral portion 33, and the two end portions of the main body 32 in the direction X are pushed by the leaf spring 35.

[0106] In addition, a first fragile portion that is weaker than the leaf spring 35 is provided at a portion of the outer peripheral portion 33 that is located between the first connecting portion and the fastening portion 33A in the direction X. Fig. 10BAs shown, under the impact load of the column crushing the push piece P, the peripheral portion 33 breaks at the first fragile portion. In addition, as described above, since the end of the main body 32 in the direction X is pushed, the main body 32 moves to the other side in the direction Y. Since the main body 32 moves to the other side in the direction Y, the fragile portion 36 and the fragile portion 37 break, and the peripheral portion 33 on the left side in the direction Y breaks at the first fragile portion. At this time, for the main body 32, since the gap 34A on the left side in the direction Y has a retreat margin, it is possible to prevent the main body 32 from being crushed by the impact load. And, as Fig. 10C As shown, the leaf spring 35 is deformed and bent.

[0107] According to the power storage module 30, even when an impact load is applied, the impact load can be absorbed by the lower retainer 31 by the fracture of the outer peripheral portion 33, the elastic force of the leaf spring 35, and the provision of the gap 34A to ensure the escape margin of the main body 32, thereby reducing the load applied to the power storage device 60. As a result, the load-bearing capacity of the power storage module 30 can be improved.

[0108] <4-1. Configuration of Power Storage Module According to Fourth Embodiment>

[0109] use Fig.11 and Fig.12 The structure of the power storage module according to the fourth embodiment will be described.

[0110] The power storage module includes a plurality of cylindrical power storage devices 60 (see Figure 3 ), upper retainers for respectively retaining the upper sides of the plurality of power storage devices in the vertical direction Z, and lower retainers 41 as retainers for respectively retaining the lower sides of the plurality of power storage devices 60. Since the power storage devices 60 and the upper retainers have the same structure as in the first embodiment, their description is omitted.

[0111] like Fig.11 As shown in FIG. 1 , the lower retainer 41 as a retainer respectively retains the lower sides of the plurality of power storage devices 60 as described above. The length of the lower retainer 41 in the vertical direction Z is sufficiently longer than the length of the upper retainer in the vertical direction Z. Therefore, the lower retainer 41 respectively retains the middle and lower parts of the plurality of power storage devices 60. The lower retainer 41 is formed of, for example, a thermoplastic resin, similarly to the upper retainer.

[0112] The lower holder 41 is formed in a substantially rectangular shape when viewed from the vertical direction Z. The lower holder 41 has a housing portion 42A for housing a plurality of power storage devices. The housing portion 42A is formed in a circular shape when viewed from the vertical direction Z. The middle portion and the lower portion of the power storage device 60 are fitted into the housing portion 42A.

[0113] A plurality of fastening portions 43A arranged along the direction X for fastening the lower retaining member 41 to the power storage group (not shown) are formed at the end portion in the direction Y of the lower retaining member 41. In addition, a plurality of fastening portions 43A may also be formed at the end portion in the direction X of the lower retaining member 41. The lower retaining member 41 of the present embodiment is fastened and fixed to the power storage group by a fixing member such as a bolt. In addition, the lower retaining member 41 may also be fastened and fixed to the body of the vehicle by a fixing member such as a bolt. The fastening portion 43A is formed as a semicircular convex portion protruding toward the outside of the direction Y when viewed from the up-down direction Z. The fastening portion 43A may be cylindrical, and has an internal thread portion formed with thread teeth on the inner circumferential surface to be fastened with a bolt having a high rigidity, and the internal thread portion becomes a member having a high rigidity so as to withstand the fastening of the bolt. Therefore, the fastening portion 43A becomes a particularly high rigidity portion in the lower retaining member 41. Furthermore, since the fastening portion is fastened and fixed to the member of the power storage group or the vehicle body as described above, it is particularly difficult to be displaced in the power storage module of the present embodiment.

[0114] That is, the distance between the fastening portion 43A and the power storage device (first power storage device) adjacent to the fastening portion 43A is longer than the distance between the power storage device and the power storage device (second power storage device) adjacent to the power storage device. That is, the above-mentioned storage portion 42A is not formed near the fastening portion 43A. In other words, the power storage device 60 is not arranged near the fastening portion 43A. More specifically, the storage portion 42A is not formed within a range where the distance from the fastening portion 43A in the direction Y is within the diameter of the power storage device 60. 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 larger than the diameter of the power storage device 60.

[0115] By setting the above structure, when an impact load is applied to the fastening portion 43A from one side of the direction Y during a side collision of the vehicle (or electronic device), the impact load acting on the power storage device 60 can be reduced because the power storage device 60 is not arranged near the fastening portion 43A.

[0116] The fastening portion 43A is formed at a position outside the housing portion 42A in the direction Y. More specifically, the housing portion 42A is formed at a position inside the head portion of the fixing tool at the fastening portion 43A in the direction Y.

[0117] like Fig.12 As shown, the interval S1 between adjacent fastening portions 43A in the direction X is determined based on the radius R of the column crushing pusher P when assuming that the column crushing pusher P collides from the direction Y. Specifically, when the radius of the hole of the fastening portion 43A is set to r, the interval S1 between the fastening portions 43A in the direction X is determined by the following formula.

[0118] [Mathematical formula 1]

[0119] S1=2(r 2 +2Rr) 0.5

[0120] With the above configuration, when the column crushing pusher P collides from one side in the direction Y, the column crushing pusher P can be prevented from entering by the fixing member fastened to the fastening portion 43A and the fixing member fastened to the fastening portion 43A.

[0121] In the present invention, a side collision of a vehicle (or electronic device) equipped with a power storage module is assumed. Therefore, a collision test in direction Y is performed on the power storage module using a column crushing push piece P. Fig.13 As shown, the impact load is applied to the power storage module from the right side in the direction Y by the column crushing push piece P.

[0122] For example, when the column crushing push piece P collides with the fastening portion 43A, since the power storage device 60 is not arranged near the fastening portion 43A, the impact load acting on the power storage device 60 can be reduced. In addition, when the column crushing push piece P collides with the portion between the fastening portions 43A and the fastening portions 43A, since the interval S1 between the fastening portions 43A and the fastening portions 43A is determined as described above, the column crushing push piece P can be prevented from entering by the fixing member fastened to the fastening portion 43 and the fixing member fastened to the fastening portion 43A, and the impact load acting on the power storage device 60 can be reduced.

[0123] According to the power storage module, even when an impact load acts upon a side collision of the vehicle, the load acting on the power storage device 60 can be reduced. Thus, the load-bearing property of the power storage module can be improved.

[0124] <4-2. Configuration of Power Storage Pack According to Fourth Embodiment>

[0125] use Fig.14 The structure of the power storage pack 140 according to the fourth embodiment will be described.

[0126] like Fig.14 As shown, the power storage group 140 includes: a plurality of power storage modules, and the plurality of power storage modules use a lower holder 41 to hold a plurality of cylindrical power storage devices 60 (see Figure 3 ) and a housing 141 in which a plurality of power storage modules are arranged. Since the power storage device 60 has the same structure as that of the first embodiment, the description thereof will be omitted.

[0127] The housing 141 is formed into a rectangular shape when viewed from the vertical direction Z. The housing 141 is preferably formed of 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 power storage pack 140 of this embodiment is fastened to the vehicle body by a fastener such as a bolt. The fastening portion 143A is formed into a semicircular convex portion protruding toward the outside of the direction Y when viewed from the vertical direction Z.

[0128] The interval S2 between the adjacent fastening parts 143A in the direction X is determined based on the radius R of the column crushing pusher P when the column-shaped column crushing pusher P collides from the direction Y. Specifically, when the radius of the hole of the fastening part 143A is set to r, the interval S2 is determined by the following formula (refer to Fig.12 ).

[0129] [Mathematical formula 2]

[0130] S2=2(r 2 +2Rr) 0.5

[0131] With the above configuration, when the column crushing push piece P collides from one side in the direction Y, the fixing piece fastened to the fastening portion 143A and the fixing piece fastened to the fastening portion 143A can prevent the column crushing push piece P from entering. This can reduce the impact load acting on the power storage device 60.

[0132] <4-3. Structure of vehicle according to fourth embodiment>

[0133] use Fig.15 and Fig.16 The structure of a vehicle 240 according to the fourth embodiment will be described.

[0134] like Fig.15 and Fig.16 As shown, a vehicle 240 includes a plurality of cylindrical power storage devices 60, a holder 241 for holding each of the plurality of power storage devices 60, an exhaust passage 245 provided on the upper portion of the holder 241, a heat exchange member 246 for cooling the power storage devices 60, and a heat conductor 247 for thermally connecting the plurality of power storage devices 60 and the heat exchange member 243. The power storage devices 60 have the same structure as that of the first embodiment, and therefore description thereof will be omitted.

[0135] The holder 241 will be described in detail later. When the power storage device 60 is abnormal, the exhaust passage 245 exhausts the gas in the power storage device 60 to the outside. The exhaust passage 245 has an exhaust port (not shown) that communicates with the outside of the vehicle 240.

[0136] The heat exchange member 246 is disposed inside the holder 241 and is a member for cooling the lower end of the power storage device 60. The heat exchange member 246 of this embodiment can be a plate-shaped metal having thermal conductivity, but can also be a water cooling pipe, an air cooling fin, a refrigerant cooling pipe, a plate heater, a sheet heater, etc.

[0137] The heat conductor 247 is a member that 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. A fluid having viscosity and a gel-like fluid that solidifies after a predetermined time can be used for the heat conductor 247. In this example, a material containing metal oxide (e.g., aluminum oxide, zinc oxide), metal nitride (e.g., aluminum nitride, boron nitride), metal oxynitride (e.g., aluminum oxynitride), etc. in silicon as a two-component solidifying material is used for the heat conductor 247.

[0138] like Fig.15 As shown, the holder 241 is formed of, for example, a thermoplastic resin. The holder 241 is formed with a storage portion 242A for storing a plurality of power storage devices 60. The storage portion 242A is formed in a circular shape when viewed from the up-down direction Z. The power storage device 60 is fitted into the storage portion 242A. The storage portion 242A formed at the end in the direction Y is formed in a manner that a predetermined gap is provided between the storage portion 242A and the end in the direction Y of the holder 241.

[0139] With the above configuration, when an impact load is applied from one side in the direction Y during a side collision of the vehicle, the impact load acting on the power storage device 60 can be reduced.

[0140] A plurality of fastening portions 243A for fastening the holder 241 to the vehicle body of the vehicle 240 are formed at the end portions of the holder 241 in the direction Y. The holder 241 of the present embodiment is fastened and fixed to the vehicle body by fasteners such as bolts.

[0141] The interval S3 between the adjacent fastening parts 243A in the direction X is determined based on the radius R of the column crushing pusher P when the column-shaped column crushing pusher P collides from the direction Y. Specifically, when the radius of the hole of the fastening part 243A is set to r, the interval S3 is determined by the following formula (refer to Fig.12 ).

[0142] [Mathematical formula 3]

[0143] S3=2(r 2 +2Rr) 0.5

[0144] With the above configuration, when the column crushing push piece P collides from one side in the direction Y, the fixing piece fastened to the fastening portion 243A and the fixing piece fastened to the fastening portion 243A can prevent the column crushing push piece P from entering. This can reduce the impact load acting on the power storage device 60.

[0145] <5-1. Configuration of power storage module according to fifth embodiment>

[0146] use Fig.17 The structure of the power storage module according to the fifth embodiment will be described.

[0147] like Fig.17 As shown, the power storage module includes a plurality of cylindrical power storage devices 60 (see Figure 3 ), upper retainers (not shown) for respectively retaining the upper sides of the plurality of power storage devices 60 in the up-down direction Z, and lower retainers 51 as retainers for respectively retaining the lower sides of the plurality of power storage devices 60. The power storage devices 60 and the upper retainers have the same structure as in the first embodiment, and therefore their description is omitted.

[0148] The lower retainer 51 as a retainer holds the lower sides of the plurality of power storage devices 60 as described above. The length of the lower retainer 51 in the vertical direction Z is sufficiently longer than the length of the upper retainer 9 in the vertical direction Z. Therefore, the lower retainer 51 holds the middle and lower parts of the plurality of power storage devices 60. The lower retainer 51 is formed of, for example, a thermoplastic resin, similarly to the upper retainer.

[0149] The lower holder 51 is formed in a substantially rectangular shape when viewed from the vertical direction Z. The lower holder 51 has a housing portion 52A for housing a plurality of power storage devices 60. The housing portion 52A is formed in a circular shape when viewed from the vertical direction Z. The middle portion and the lower portion of the power storage device 60 are fitted into the housing portion 52A.

[0150] A plurality of fastening portions 53A for fastening the lower retainer 51 to the power pack (not shown) are formed at the end portion of the lower retainer 51 in the direction Y. In addition, a plurality of fastening portions 53A may be formed at the end portion of the lower retainer 51 in the direction X. The lower retainer 51 of this embodiment is fastened to the power pack by a fastener such as a bolt. In addition, the lower retainer 51 may also be fastened to the body of the vehicle by a fastener such as a bolt. The fastening portion 53A is formed as a semicircular convex portion protruding toward the outside of the direction Y when viewed from the up-down direction Z.

[0151] The fastening portion 53A is formed at a position outside the housing portion 52A in the direction Y. More specifically, the housing portion 52A is formed at a position inside the head portion of the fixing tool at the fastening portion 53A in the direction Y.

[0152] A reinforcing plate 54 is provided at a position in the direction X of the lower retainer 51 where the fastening portion 53A is formed. The reinforcing plate 54 protrudes from the storage portion 52A in the direction Y and is made of a material having higher rigidity than the lower retainer 51. The reinforcing plate 54 is made of, for example, metal and is preferably formed integrally with the lower retainer 51 by insert molding when the lower retainer 51 is formed. The length of the reinforcing plate 54 in the direction Y and the length in the up-down direction Z are preferably substantially the same as the length of the lower retainer 51 in the direction Y and the length in the up-down direction Z. However, the length in the up-down direction Z may be different. In addition, the position of the reinforcing plate 54 is not limited to the above position. The reinforcing plate 54 may be located at a position different from the fastening portion 53A in the direction X as long as it protrudes from the fastening portion 53A in the direction Y.

[0153] The interval S4 between the adjacent fastening portions 53A in the direction X is determined based on the radius R of the column crushing pusher P when assuming that the column-shaped column crushing pusher P collides from the direction Y. Specifically, when the radius of the hole of the fastening portion 53A is set to r, the interval S4 is determined by the following formula.

[0154] [Formula 4]

[0155] S4=2(r 2 +2Rr) 0.5

[0156] With the above configuration, when the column crushing pusher P collides from one side in the direction Y, the column crushing pusher P can be prevented from entering by the fixing member fastened to the fastening portion 53A and the fixing member fastened to the fastening portion 53A.

[0157] In the present invention, a side collision of a vehicle (or electronic device) is assumed. Therefore, a collision test in direction Y is performed on the power storage module using a column crushing push piece P. Fig.18 As shown, the impact load is applied to the power storage module from the right side in the direction Y by the column crushing push piece P.

[0158] For example, when the column crushing push piece 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 power storage device 60 is small. In addition, when the column crushing push piece P collides with the portion between the fastening portion 53A and the fastening portion 53A, since the interval S4 between the fastening portions 53A is determined as described above, the column crushing push piece P can be prevented from entering by the fixing member fastened to the fastening portion 53A and the fixing member fastened to the fastening portion 53A.

[0159] According to the power storage module, even when an impact load acts upon a side collision of the vehicle, the load acting on the power storage device 60 can be reduced. Thus, the load-bearing property of the power storage module can be improved.

[0160] In addition, the present invention is not limited to the above-described embodiment and its modified examples, and it goes without saying that various changes and improvements can be made within the scope of the matters described in the claims of the present application.

[0161] Description of Reference Numerals

[0162] 9. Upper retainer; 10. Power storage module; 11. Lower retainer (retainer); 12. Main body; 12A. Accommodation portion; 13. Peripheral portion; 13A. Fastening portion; 14. Gap; 14A. Gap (first gap); 14B. Gap (second gap); 14C. Gap (third gap); 15. Support portion; 16. Fragile portion (second fragile portion); 17. Fragile portion (third fragile portion); 20. Power storage module; 21. Lower retainer (retainer); 22. Main body; 22A, storage part; 23, peripheral part; 23A, fastening part; 24, gap; 24A, gap (first gap); 24B, gap (second gap); 24C, gap (third gap); 26, fragile part (second fragile part); 27, fragile part (third fragile part); 28, first leaf spring; 29, second leaf spring; 30, power storage module; 31, lower retainer (retainer); 32, main body; 32A, storage part; 33, peripheral part; 33A, fastening part; 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 retainer (retainer); 42A, storage portion; 43A, fastening portion; 51, lower retainer (retainer); 52A, storage portion; 53A, fastening portion; 54, reinforcing plate; 60, power storage device; 61, positive electrode; 62, negative electrode; 63, Spacer; 64, electrode group; 65, outer can; 65A, groove; 66, sealing body; 67, positive lead; 68, negative lead; 69, gasket; 70, insulating plate; 140, storage group; 141, shell; 143A, fastening part; 144, heat exchange member; 240, vehicle; 241, retaining member; 241A, fastening part; 242A, storage part; 243, heat exchange member; 245, exhaust channel; 246, heat exchange member; 247, thermal conductor.

Claims

1. A power storage module, wherein: The power storage module has: at least one cylindrical power storage device; and a retainer that retains the power storage device in an axial direction of the power storage device, The retaining member has: a main body including a storage portion for holding the power storage device; and an outer peripheral portion, which surrounds the main body with a gap between the outer peripheral portion and the main body, When a direction perpendicular to the axial direction of the power storage device is set as a first direction and a direction perpendicular to both the axial direction and the first direction is set as a second direction, an impact buffer portion is provided in a first gap in the gap located between the main body and the outer peripheral portion in the first direction.

2. The power storage module according to claim 1, wherein: The shock absorbing portion includes a plurality of supporting portions that respectively connect the first connecting portion of the outer peripheral portion to a plurality of second connecting portions of the main body that are arranged in the axial direction of the power storage device and in the second direction.

3. The power storage module according to claim 2, wherein: The plurality of support portions extend obliquely so as to intersect with the first direction.

4. The power storage module according to claim 2 or 3, wherein: A plurality of fastening parts for fastening the retainer are formed on the outer peripheral part, The plurality of fastening parts are arranged in a row in the second direction, The first connection portion is provided between a pair of adjacent fastening portions among the plurality of fastening portions.

5. The power storage module according to claim 4, wherein: A first fragile portion is provided between one of the pair of adjacent fastening portions and the first connecting portion.

6. The power storage module according to any one of claims 2 to 5, wherein: A second fragile portion connecting the outer peripheral portion and the main body is formed in a second gap located between the main body and the outer peripheral portion in the second direction among the gaps.

7. The power storage module according to any one of claims 2 to 6, wherein: The retaining member has a plurality of the main bodies, The plurality of bodies are arranged in the second direction with a third gap between them. A third fragile portion connecting the main bodies to each other is formed in the third gap.

8. The power storage module according to any one of claims 2 to 7, wherein: The outer peripheral portion is cylindrical.

9. The power storage module according to claim 1, wherein: The impact buffer portion comprises: a first leaf spring constituting a portion of the outer peripheral portion along the second direction; and The second leaf spring connects the first leaf spring and a pair of second connection portions of the main body arranged in the second direction.

10. The power storage module according to claim 9, wherein: A plurality of fastening portions arranged along the second direction for fastening the retainer are formed on the outer peripheral portion. The first leaf spring is disposed between a pair of mutually adjacent fastening portions among the plurality of fastening portions and is connected to the pair of fastening portions.

11. The power storage module according to claim 9 or 10, wherein: The first leaf spring and the second leaf spring are connected at a first connection portion. A first fragile portion is formed at a portion of the first leaf spring located between the first connecting portion and one of the pair of fastening portions.

12. The power storage module according to any one of claims 9 to 11, wherein: A second fragile portion connecting the outer peripheral portion and the main body is formed in a second gap located between the main body and the outer peripheral portion in the second direction among the gaps.

13. The power storage module according to any one of claims 9 to 12, wherein: The retaining member has a plurality of the main bodies, The plurality of bodies are arranged in the second direction with a third gap between them. A third fragile portion connecting the main bodies to each other is formed in the third gap.

14. The power storage module according to any one of claims 9 to 13, wherein: The outer peripheral portion is cylindrical.

15. The power storage module according to claim 1, wherein: The shock absorbing portion includes an arched leaf spring connected to a first connecting portion of the outer peripheral portion and a pair of second connecting portions of the main body arranged in the second direction of the power storage device.

16. The power storage module according to claim 15, wherein: A plurality of fastening portions arranged along the second direction for fastening the retainer are formed on the outer peripheral portion. The first connection portion is provided between a pair of adjacent fastening portions among the plurality of fastening portions.

17. The power storage module according to claim 16, wherein: A first fragile portion is provided between one of the pair of adjacent fastening portions and the first connecting portion.

18. The power storage module according to any one of claims 15 to 17, wherein: A second fragile portion connecting the outer peripheral portion and the main body is formed in a second gap located between the main body and the outer peripheral portion in the second direction among the gaps.

19. The power storage module according to any one of claims 15 to 18, wherein: The retaining member has a plurality of the main bodies, The plurality of bodies are arranged in the second direction with a third gap between them. A third fragile portion connecting the main bodies to each other is formed in the third gap.

20. The power storage module according to any one of claims 15 to 19, wherein: The outer peripheral portion is cylindrical.

21. The power storage module according to any one of claims 15 to 20, wherein: The leaf spring contacts the outer peripheral portion at the first connection portion.

Images