accumulator pack

Abstract

The present application provides a kind of electric storage package, the electric storage package is equipped with shell, the shell is equipped with the sheet with air permeability, the electric storage package can be properly prevented the attachment of moisture to the sheet.In the electric storage package disclosed here, the shell (600) has: main body portion (610) with bottom surface (610a) and bottom surface cover (640) covering the lower side of the bottom surface (610a) of main body portion (610).There is an opening (612H), a vent (EO) and a recess (611) on the lower side of the bottom surface (610a) of main body portion (610).The opening (612) is covered by the sheet (612M) with air permeability.The vent (EO) is arranged at a position away from the opening (612H) in the outer periphery of the bottom surface (610a).The recess (611) reaches the vent (EO) from the opening (612H).The bottom surface cover (640) has at least one through hole (616) in the area where the recess (611) is formed, from the opening (612) to the vent (EO).

Description

Technical Field

[0001] This disclosure relates to battery packs. Background Technology

[0002] Japanese Patent Application Publication No. 2017-152164 discloses an energy storage device comprising an outer casing and an energy storage element housed inside the outer casing. The outer casing is described as having a vent chamber that connects the interior and exterior of the outer casing.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-152164 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, for example, if the outer casing (housing) gets wet from rain, moisture can sometimes seep into the interior of the outer casing from the ventilation chamber. To address this, the inventors considered incorporating a sheet into the outer casing that is breathable and allows air to be introduced from the outside to adjust the pressure difference between the inside and outside of the outer casing. However, according to the inventors' research, moisture that has penetrated into the outer casing may adhere to this sheet. This could reduce the sheet's functionality, which is undesirable. Therefore, there is a need to develop a technology that can appropriately prevent moisture from adhering to the sheet.

[0008] Methods for solving problems

[0009] The disclosed battery pack includes multiple energy storage devices and a housing having a receiving space for accommodating the multiple energy storage devices. The housing includes a main body portion having a bottom surface and a bottom cover covering the lower side of the bottom surface of the main body portion. On the lower side of the bottom surface of the main body portion, there is an opening, a vent, and a recess. The opening is formed at a predetermined position and is covered by a breathable sheet. The vent is located at a position away from the opening on the outer periphery of the bottom surface. The recess extends from the opening to the vent. The bottom cover overlaps at the periphery of the recess. Furthermore, the bottom cover has at least one through hole in the area where the recess is formed, extending from the opening to the vent. According to this disclosure, a battery pack can be provided that includes a housing with a breathable sheet, which can appropriately prevent water from adhering to the sheet. Attached Figure Description

[0010] Figure 1 This is a perspective view schematically illustrating one embodiment of a battery pack.

[0011] Figure 2 It is a schematic representation Figure 1 A 3D view of the energy storage module.

[0012] Figure 3 It is a schematic three-dimensional diagram representing an energy storage device.

[0013] Figure 4 Viewed from the bottom cover side Figure 1 A schematic diagram of the casing.

[0014] Figure 5 Is to make Figure 4 The diagram shows the bottom cover being made transparent, thus making the structure directly beneath the protective cover visible.

[0015] Figure 6 yes Figure 5 Sectional view along line VI-VI.

[0016] Figure 7 This is a schematic diagram illustrating the through hole in other embodiments.

[0017] Explanation of reference numerals in the attached figures

[0018] 100 Storage devices

[0019] 200 spacers

[0020] 300 Restricted Organizations

[0021] 500 energy storage module

[0022] 600 housing

[0023] 610 Main Body

[0024] 611 Recessed part for exhaust (recessed part)

[0025] 612 Atmospheric Connection Part

[0026] 612M film

[0027] 612H First opening (opening)

[0028] 613 Refrigerant recess

[0029] 614 Second Opening

[0030] 615 Protective Cover

[0031] 616 Through Hole

[0032] 620 Upper Surface Cover

[0033] Fasteners for 615F, 630, and 650

[0034] 640 bottom cover

[0035] 660 seal

[0036] EO vent

[0037] FP refrigerant flow path

[0038] FI Inflow

[0039] FO Outflow Department

[0040] EP exhaust flow path

[0041] 800 battery pack. Detailed Implementation

[0042] Hereinafter, preferred embodiments of the technology disclosed herein will be described with appropriate reference to the accompanying drawings. Matters other than those specifically mentioned in this specification and necessary for implementing the technology disclosed herein (e.g., the general structure and manufacturing process of a battery pack not characterized by the technology disclosed herein) can be understood by those skilled in the art based on prior art. The technology disclosed herein can be implemented based on the content disclosed in this specification and common technical knowledge in the field. In this specification and the claims, the expression "A~B" indicating scope means "A or more and B or less." Furthermore, the expression "A~B" includes both "more than A" and "less than B."

[0043] Figure 1 This is a perspective view schematically illustrating one embodiment of a battery pack 800. It should be noted that in the following figures, reference numerals F, Rr, L, R, U, and D represent front, rear, left, right, top, and bottom, respectively, and reference numerals X, Y, and Z represent a first direction, a second direction orthogonal to the first direction, and a third direction orthogonal to both the first and second directions, respectively. The first direction X is the arrangement direction of the battery storage devices described later. However, these are merely directions for ease of explanation and do not limit the arrangement of the battery modules or battery pack. Furthermore, in the following figures, components and parts that perform the same function are labeled with the same reference numerals, and sometimes repeated descriptions are omitted or simplified.

[0044] like Figure 1 As shown, the energy storage pack 800 of this embodiment includes a plurality of energy storage modules 500 and a housing 600. The housing 600 is a frame that houses the plurality of energy storage modules 500. The material of the housing 600 can be the same as conventionally used materials and is not particularly limited. The housing 600 is preferably made of metal, and more preferably of aluminum, aluminum alloy, iron, iron alloy, stainless steel, etc. The housing 600 of this embodiment has a main body 610, an upper surface cover 620, and a bottom surface cover 640.

[0045] Here, the main body 610 has a bottom surface 610a (see reference). Figure 5 The main body 610 is a bottomed, cylindrical (box-shaped) part with an opening facing the bottom surface 610a. Here, the main body 610 is a casting formed by casting. The upper surface cover 620 is a component that seals the opening of the main body 610. The upper surface cover 620 constitutes the first surface of the housing 600 in the third direction Z (…). Figure 1 The main body 610 and the upper surface cover 620 are fastened together at multiple fastening parts 630 provided on the outer edge of the housing 600, forming an integral unit. The main body 610 and the upper surface cover 620 divide the housing 600 into a receiving space 600A (first space). Multiple energy storage modules 500 are housed in the receiving space 600A.

[0046] The bottom cover 640 covers the bottom surface 610a of the main body 610 from the lower side (outer surface side) (see reference). Figure 5 The bottom cover 640 is arranged facing the bottom surface 610a. Here, the bottom cover 640 is a plate-shaped component. The bottom cover 640 constitutes the second surface of the housing 600 in the third direction Z. Figure 1 The main body 610 and the bottom cover 640 are fastened together at multiple fastening parts 650 provided on the outer edge of the housing 600, etc., and are thus integrated. Details will be described later. Between the bottom surface 610a of the main body 610 and the bottom cover 640, an exhaust path EP (second space, see below) is provided for discharging gas generated from the energy storage module 500 in the housing space 600A (first space) of the housing 600. Figure 5 ) and the refrigerant flow path FP (third space, reference) for refrigerant circulation. Figure 5 ).

[0047] like Figure 1 As shown, the housing 600 is provided with a vent EO, an inlet FI, and an outlet FO. The vent EO is for the exhaust flow path EP (refer to...) Figure 5 The portion that communicates with the outside of the housing 600 (external air). Here, there are multiple vents EO (specifically two). Here, the multiple vents EO are located in the first direction X ( Figure 1 They are spaced apart on the front and rear sides. For example... Figure 5 As shown, multiple vents EO are located at positions on the outer periphery of the bottom surface 610a that are away from the first opening 612H.

[0048] Inlet section FI and refrigerant flow path FP (reference) Figure 5 The inflow section FI is the part that allows refrigerant to flow from the outside of the housing 600 into the refrigerant flow path FP. Here, the inflow section FI is located on the side of the housing 600 (specifically, the main body 610). Figure 1(YZ side). The inlet FI is located on the side intersecting with the upper surface cover 620 and / or the bottom surface cover 640. It should be noted that, as the refrigerant, any refrigerant known to be suitable for this purpose can be used without particular limitation. As an example, liquids such as cooling water can be cited.

[0049] Outlet FO and refrigerant flow path FP (reference) Figure 5 The refrigerant outlet FO is a portion that allows the refrigerant flowing in the refrigerant flow path FP to flow out of the housing 600. Here, the outlet FO is located on the side of the housing 600 (specifically, the main body 610). Figure 1 (YZ surface). Here, the outlet FO is provided on the same surface of the housing 600 as the inlet FI. The outlet FO is provided on the surface that intersects with the upper surface cover 620 and / or the bottom surface cover 640.

[0050] like Figure 1 As shown, here, there are multiple (specifically three) energy storage modules 500, arranged along the second direction Y in the receiving space 600A of the housing 600. It should be noted that the number and arrangement of the energy storage modules 500 are not particularly limited. For example, there may be multiple energy storage modules 500 other than three, or even just one. Furthermore, the energy storage modules 500 may also be arranged along the first direction X. Additionally, the structure of the energy storage modules 500 is not particularly limited and can be the same as conventional ones.

[0051] Figure 2 This is a schematic perspective view of the energy storage module 500. The energy storage module 500 of this embodiment includes a plurality of energy storage devices 100 arranged along an arrangement direction X and spacers 200 arranged between adjacent energy storage devices 100 in the arrangement direction X. The energy storage module 500 also includes a limiting mechanism 300 configured to apply a predetermined limiting load to the plurality of energy storage devices 100 from the arrangement direction X. Thus, the plurality of energy storage devices 100 are integrally held together.

[0052] The spacer 200 is a component used to separate the multiple energy storage devices 100. The spacer 200 is preferably an insulating component. Here, the spacers 200 are respectively disposed between the multiple energy storage devices 100 in the arrangement direction X. That is, in the energy storage module 500, the energy storage devices 100 and the spacers 200 are arranged alternately in the arrangement direction X. However, the spacers 200 are not essential and may be omitted in other embodiments.

[0053] The energy storage device 100 is a device capable of repeated charging and discharging. It should be noted that, in this specification, "energy storage device" includes the concepts of secondary batteries such as lithium-ion batteries and nickel-metal hydride batteries, as well as capacitors such as lithium-ion capacitors, pseudocapacitive capacitors, and double-layer capacitors.

[0054] Multiple energy storage devices 100 are arranged along the arrangement direction X (the thickness direction of the energy storage device 100). In this embodiment, the even-numbered energy storage device 100 in the arrangement direction X is configured in a state where it is rotated 180° relative to the odd-numbered energy storage device 100 in the arrangement direction X (reversed state). Here, the multiple energy storage devices 100 have the same shape and size. However, the shape, size, number, etc. of the multiple energy storage devices 100 constituting the energy storage module 500 are not limited to this. Figure 2 The method can be changed appropriately.

[0055] Figure 3 This is a 3D view of the energy storage device 100. (For example...) Figure 3 As shown, the energy storage device 100 is a flat, square shape. The energy storage device 100 is a square secondary battery. The energy storage device 100 of this embodiment includes a battery casing 10, electrode bodies (not shown), and an electrolyte. Here, the energy storage device 100 is a non-aqueous electrolyte secondary battery, specifically a lithium-ion secondary battery.

[0056] The battery casing 10 is a container that houses the electrodes and the electrolyte. For example... Figure 3 As shown, the battery casing 10 has a flat, rectangular (square) shape. The material of the battery casing 10 can be the same as conventionally used materials, and there is no particular limitation. The battery casing 10 is preferably made of metal, and more preferably of aluminum, aluminum alloy, iron, iron alloy, stainless steel, etc. Here, the battery casing 10 includes a casing body 12 with an opening and a sealing plate 14 (cover) for sealing the opening.

[0057] Here, the main body 12 of the housing is a bottomed rectangular tube. The main body 12 of the housing includes: a generally rectangular lower surface 12a having a long side and a short side; a pair of long side surfaces 12b extending from the long side of the lower surface 12a and facing each other; and a pair of short side surfaces 12c extending from the short side of the lower surface 12a and facing each other. The lower surface 12a is the surface facing the bottom cover 640 of the housing 600. The long side surfaces 12b are the surfaces orthogonal to the arrangement direction X. Here, the long side surfaces 12b are the surfaces facing (more specifically, abutting) the spacer 200. It should be noted that in this specification, "generally rectangular" includes not only a perfect rectangle, but also shapes such as those where the corners connecting the long and short sides of the rectangle are R-shaped (rounded corners), or shapes with cutouts at the corners.

[0058] The electrode body and electrolyte are housed inside the main body 12. The electrode body has a positive electrode and a negative electrode. The electrolyte is typically a non-aqueous electrolyte containing a non-aqueous solvent and a supporting electrolyte (electrolyte salt). Since the electrode body and electrolyte can be the same as before, detailed description is omitted here.

[0059] like Figure 3As shown, the sealing plate 14 is generally rectangular when viewed from above. The sealing plate 14 is a plate-shaped component extending along the XY plane. The sealing plate 14 is mounted on the opening of the housing body 12. The sealing plate 14 is the surface facing the upper surface cover 620 of the housing 600. The battery housing 10 is integrated by joining (preferably welding) the sealing plate 14 to the periphery of the opening of the housing body 12. The battery housing 10 is hermetically sealed (sealed).

[0060] The sealing plate 14 is provided with an injection hole 15, a gas discharge valve 17, a positive terminal 30, and a negative terminal 40. The injection hole 15 is used to inject electrolyte into the battery housing 10 after the sealing plate 14 is assembled to the housing body 12. The injection hole 15 is sealed by the sealing member 16 after the electrolyte is injected. The gas discharge valve 17 is configured to break when gas is generated inside the battery housing 10 and the internal pressure of the battery housing 10 reaches or exceeds a predetermined value due to the generated gas. As a result, the gas generated inside the battery housing 10 is discharged to the outside of the battery housing 10 via the gas discharge valve 17, specifically to the receiving space 600A of the housing 600.

[0061] The positive terminal 30 and the negative terminal 40 are respectively disposed at the two ends of the sealing plate 14 in the second direction Y. The positive terminal 30 is electrically connected to the positive electrode of the electrode body inside the housing body 12. The negative terminal 40 is electrically connected to the negative electrode of the electrode body inside the housing body 12.

[0062] A busbar is attached to the positive terminal 30 and the negative terminal 40 to electrically connect the multiple energy storage devices 100 to each other. In this embodiment, in two adjacent energy storage devices 100 in the arrangement direction X, the positive terminal 30 of one energy storage device 100 is electrically connected to the negative terminal 40 of the other energy storage device 100 via the busbar. Thus, the multiple energy storage devices 100 are electrically connected in series. However, the connection method of the multiple energy storage devices 100 is not limited to series connection; for example, it can also be parallel connection or multiple series and multiple parallel connection, etc.

[0063] Here, Figure 4 Viewed from the bottom cover 640 side Figure 1 A schematic diagram of the casing at 600°. Figure 5 Is to make Figure 4 The bottom cover 640 is made transparent, and the structure directly below the protective cover 615 is visualized. Figure 6 yes Figure 5 Sectional view along line VI-VI.

[0064] like Figure 5 As shown, when viewed from above, the bottom surface 610a of the main body 610 is divided into one side located in the second direction Y ( Figure 5 The exhaust area AE on the upper side and the other side located in the second direction Y ( Figure 5The refrigerant region AF is located on the lower side of the exhaust region AE. The exhaust region AE and the refrigerant region AF are arranged to be adjacent in the second direction Y.

[0065] In the exhaust region AE located on the right side of the second direction Y, such as Figure 5 As shown, an exhaust flow path EP is provided between the bottom surface 610a of the main body 610 of the housing 600 and the bottom cover 640. Figure 5 As shown, the exhaust flow path EP communicates with the outside of the housing 600 via multiple vents EO. On the lower side (D side in the Z direction) of the bottom surface 610a of the main body 610, there is a first opening 612H, which is formed at a predetermined position and covered by a breathable sheet 612M described later. The exhaust flow path EP communicates with the receiving space 600A (first space) of the housing 600 via an atmospheric connection 612. The exhaust flow path EP is a hollow portion, constituting an exhaust flow path from the atmospheric connection 612 to the vents EO. Furthermore, in the exhaust region AE, the bottom surface 610a of the main body 610 has an exhaust recess 611 and an atmospheric connection 612 on the side facing the bottom cover 640.

[0066] like Figure 5 As shown, the exhaust recess 611 extends linearly along the first direction X. Figure 6 As shown, the exhaust recess 611 is recessed towards the side away from the bottom cover 640 (the receiving space 600A side of the housing 600). The exhaust recess 611 is a recessed portion that extends from the first opening 612H to the vent EO. ​​Here, the exhaust recess 611 is approximately U-shaped in cross-section. The bottom cover 640 overlaps with the periphery of the exhaust recess 611. The exhaust recess 611 and the bottom cover 640 together define the exhaust flow path EP. The exhaust recess 611 (or the exhaust flow path EP) is preferably positioned, at least partially, in a location that does not overlap with the plurality of energy storage devices 100 when viewed from above.

[0067] like Figure 6 As shown, the atmospheric communication portion 612 is configured to maintain a predetermined pressure (typically atmospheric pressure) within the housing space 600A (first space) of the housing 600. The atmospheric communication portion 612 has a first opening 612H (communication hole) and a sheet 612M (so-called breathable membrane) that blocks the first opening 612H. The first opening 612H is provided to penetrate the bottom surface 610a of the housing 600 in the third direction Z, communicating the housing space 600A of the housing 600 with the exhaust flow path EP.

[0068] Sheet 612M is a breathable membrane-like component. Sheet 612M is typically a porous membrane with tiny pores. Sheet 612M is preferably made of resin. Preferred examples of resin materials constituting sheet 612M include fluoropolymers such as polytetrafluoroethylene, polyolefin resins such as polyethylene and polypropylene, and polyester resins. Sheet 612M may be composed of only one of these resins or of two or more. More specifically, porous membranes made of polytetrafluoroethylene, polyethylene, polypropylene, and polyester nonwoven fabrics can be used as sheet 612M. Here, sheet 612M is configured to allow gases such as air to pass through while blocking liquids such as moisture from passing through. Thus, the intrusion of moisture into the receiving space 600A is suppressed. Although not particularly limited, the thickness of sheet 612M is, for example, 1 mm to 10 mm, preferably 1 mm to 5 mm.

[0069] like Figure 5 As shown, the top view of sheet 612M is approximately rectangular. The corners of sheet 612M connecting the long and short sides of the rectangle have an R-shaped (rounded) shape. It should be noted that in other embodiments, the top view of sheet 612M can be various shapes such as rectangle, circle, ellipse, triangle, trapezoid, etc.

[0070] Here, the plate 612M is configured such that when the gas discharge valve 17 of the energy storage device 100 breaks, allowing gas to be discharged into the receiving space 600A, the internal pressure of the receiving space 600A breaks when the discharged gas reaches or exceeds a predetermined value. When the plate 612M breaks, causing the first opening 612H to open, the gas discharged from the energy storage device 100 flows into the exhaust flow path EP through the first opening 612H. The gas flowing into the exhaust flow path EP is discharged from the vent EO to the outside of the housing 600. In this way, gas is discharged from the receiving space 600A of the housing 600.

[0071] like Figure 5 , Figure 6 As shown, the bottom cover 640 has a second opening 614. Additionally, a protective cover 615 is mounted on the periphery of the second opening 614 to cover it. The protective cover 615 is, for example, a plate-like component made of metal.

[0072] The sheet 612M and the protective cover 615 can be installed sequentially after the leak check described below. Specifically, first, an air leak detector is inserted into the second opening 614. Next, the air outlet of the air leak detector is installed in the first opening 612H to apply air to the inside of the housing 600. Then, by monitoring the pressure change applied inside the housing 600, a leak is checked for. Then, if no leak is confirmed, the sheet 612M is attached to the periphery of the first opening 612H, and then the protective cover 615 is installed at the periphery of the second opening 614. It should be noted that the attachment of the sheet 612M to the second opening 614 can be done, for example, with a resin adhesive. In addition, the installation of the protective cover 615 can be done, for example, by fastening it to the bottom cover 640 using multiple fasteners 615F. In this way, the sheet 612M and the protective cover 615 can be installed.

[0073] However, for example, if the housing 600 is wetted by rain, moisture may sometimes seep into the exhaust path EP through the vent EO. ​​Additionally, the interior of the housing 600 is at a higher temperature than the exterior due to the operation of the energy storage device 100, thus sometimes creating a negative pressure inside the housing 600. In this case, moisture that has seeped into the exhaust path EP may adhere to the plate 612M. The plate 612M is breathable, allowing air to be introduced from the outside to adjust the pressure difference between the interior and exterior of the housing 600, but this function may be reduced due to moisture adhesion, which is undesirable. Furthermore, if adjusting the pressure difference becomes difficult, a load is applied to the fixing portion of the plate 612M, and the plate 612M may also break. Therefore, the inventors conceived of forming the through hole 616 described below.

[0074] like Figure 5 As shown, in this embodiment, the through hole 616 exists in the region where the exhaust recess 611 is formed, extending from the first opening 612H to the vent EO. ​​Furthermore, the through hole 616 traverses the exhaust recess 611 from the location where the first opening 612H is formed to the vent EO. ​​Specifically, the through hole 616 is configured to extend from the vent EO side (… Figure 5 (R side in the Y direction) to the side opposite to the vent EO ( Figure 5 The L side in the Y direction) crosses the exhaust recess 611.

[0075] like Figure 5As shown, in this embodiment, the through hole 616 is approximately rectangular when viewed from the opening. Here, the corners of the through hole 616 connecting the long and short sides of the rectangle have an R-shaped (rounded) shape. The ratio of the length of the short side to the length of the long side of the through hole 616 can be, for example, 1:2 to 1:10, or 1:5 to 1:10. The size of the through hole 616 is preferably set appropriately according to the size of the venting recess 611, etc. In one embodiment, the length of the short side of the through hole 616 is 1mm to 10mm, or 1mm to 5mm. In another embodiment, the length of the long side of the through hole 616 is 2mm to 20mm, or 5mm to 15mm. It should be noted that in other embodiments, the shape of the through hole 616 when viewed from the opening can be various shapes such as rectangle, circle, ellipse, triangle, trapezoid, etc.

[0076] like Figure 5 As shown, in this embodiment, there are two through holes 616. Here, one through hole 616 is positioned on each side, separated by the first opening 612H. It should be noted that in other embodiments, the number of through holes 616 can be multiple (other than two), or it can be one.

[0077] The through hole 616 can be formed, for example, by punching the bottom cover 640. Alternatively, the through hole 616 can also be formed, for example, by laser processing the bottom cover 640.

[0078] In the refrigerant region AF located on the other side (left side) of the second direction Y, such as Figure 5 As shown, a refrigerant flow path FP for refrigerant flow and a sealing member 660 attached to the bottom surface 610a and the bottom cover 640 of the main body 610 of the housing 600 are provided between them. Figure 5 As shown, the refrigerant flow path FP is a hollow section that forms the flow path of the refrigerant from the inlet section FI to the outlet section FO.

[0079] like Figure 5As shown, the refrigerant recess 613 is recessed towards the side away from the bottom cover 640 (the receiving space 600A side of the housing 600). Here, the refrigerant recess 613 is approximately U-shaped in cross-section. Here, the depth of the refrigerant recess 613 (the maximum length of the recess from the outer side of the bottom surface 610a towards the third direction Z; the same applies below) is deeper than the exhaust recess 611. The refrigerant recess 613, together with the bottom cover 640, divides the refrigerant flow path FP. The refrigerant recess 613 (or refrigerant flow path FP) is preferably at least partially provided in a position facing the receiving space 600A that houses the plurality of energy storage devices 100. The refrigerant recess 613 (refrigerant flow path FP) is preferably at least partially provided in a position overlapping with each of the plurality of energy storage devices 100 in top view. By allowing the refrigerant to flow directly below the plurality of energy storage devices 100, efficient cooling can be achieved.

[0080] like Figure 5 As shown, the refrigerant recesses 613 are respectively arranged in a roughly U-shape directly below each of the multiple energy storage modules 500. Figure 5 In the example, a roughly U-shaped first portion P1 is provided directly below the first energy storage module 500, a roughly U-shaped second portion P2 is provided directly below the second energy storage module 500, and a roughly U-shaped third portion P3 is provided directly below the third energy storage module 500. The first to third portions P1 to P3 each have a pair of straight portions Ps extending along a first direction X and a curved portion Pf connecting the pair of straight portions Ps. The first portions P1 to the third portions P3 are interconnected via a connecting portion Pc that is configured in a roughly U-shape. Figure 5 As shown by the middle arrow, the refrigerant flowing from the inlet section FI into the refrigerant flow path FP flows through the first part P1, the second part P2 and the third part P3 in sequence, and then flows out from the outlet section FO to the outside of the housing 600.

[0081] As described above, the energy storage pack 800 of this embodiment includes a plurality of energy storage devices 100 and a housing 600 having a housing space 600A for accommodating the plurality of energy storage devices 100. The housing 600 includes a main body portion 610 having a bottom surface 610a and a bottom cover 640 covering the lower side of the bottom surface 610a of the main body portion 610. On the lower side of the bottom surface 610a of the main body portion 610, there is an opening (here, a first opening 612H), a vent EO, and a recess (here, an exhaust recess 611). The first opening 612H is formed at a predetermined position and is covered by a breathable sheet 612M. The vent EO is provided at a position away from the first opening 612H in the outer periphery of the bottom surface 610a. The exhaust recess 611 is a recess from the first opening 612H to the vent EO. ​​The bottom cover 640 overlaps at the periphery of the exhaust recess 611. In this embodiment, the battery pack 800 has at least one through hole 616 in the region where the venting recess 611 is formed, extending from the first opening 612H to the vent EO. ​​According to this structure, moisture entering the venting recess 611 from the vent EO is discharged through the through hole 616, thus preventing moisture from adhering to the sheet 612M covering the first opening 612H. This effectively prevents moisture from adhering to the sheet 612M. Furthermore, the through hole 616 can be formed more easily (with less time) than the bottom cover 640, making it preferable from a cost perspective.

[0082] As described above, in the battery pack 800 of this embodiment, the through hole 616 traverses the venting recess 611, which extends from the position where the first opening 612H is formed, to the vent EO. ​​According to this structure, moisture entering the venting recess 611 is more reliably discharged through the through hole 616 before reaching the plate 612M. Therefore, moisture entering the venting recess 611 is less likely to reach the plate 612M covering the first opening 612H, which is preferable.

[0083] As described above, in the battery pack 800 of this embodiment, the through hole 616 has a generally rectangular shape when viewed from the opening. According to this structure, moisture entering the venting recess 611 can easily be discharged through the through hole 616. That is, the drainage performance of the through hole 616 with this shape is particularly excellent. Therefore, moisture entering the venting recess 611 is unlikely to reach the sheet 612M covering the first opening 612H, which is therefore preferable.

[0084] As described above, in the battery pack 800 of this embodiment, the sheet 612M is composed of at least one of fluoropolymer, polyolefin resin, and polyester resin. Moisture tends to adhere particularly easily to the sheet 612M made of the above-mentioned materials. Therefore, the battery pack 800 equipped with this sheet 612M is suitable as an application of the technology disclosed herein.

[0085] The battery pack 800 disclosed herein can be used for various purposes, such as being appropriately used as a power source (drive power supply) for motors mounted in vehicles such as passenger cars and trucks. There are no particular limitations on the type of vehicle; examples include plug-in hybrid electric vehicles (PHEVs), hybrid electric vehicles (HEVs), and battery electric vehicles (BEVs).

[0086] The preferred embodiments of the present invention have been described above, but these embodiments are merely examples. The present invention can also be implemented in various other ways. The present invention can be implemented based on the content disclosed in this specification and common technical knowledge in the field. The technology described in the claims includes technologies obtained by various modifications and alterations to the embodiments illustrated above.

[0087] For example, Figure 7 This is a schematic diagram illustrating the through hole 716 in other embodiments. For example... Figure 7 As shown, in this embodiment, the through-hole 716 has a circular shape when viewed from the opening. According to this structure, since the through-holes 716 are distributed, the reduction in the rigidity of the bottom cover 640 can be more appropriately suppressed. Figure 7 As shown, in this embodiment, there are 14 through holes 716. Here, 7 through holes 716 are provided on each side, separated by the first opening 612H. On the other hand, in other embodiments, the number of through holes 716 can be multiples other than 14, or it can be a single through hole. Furthermore, in this embodiment, the number of through holes 716 is set to be the same on both sides, but in other embodiments, it can be different. The through holes 716 can be formed, for example, using the same method as the through holes 616 described above.

[0088] For example, in the above embodiment, the battery pack 800 houses multiple energy storage devices 100 as an energy storage module 500, but it is not limited to this. In other embodiments, the battery pack 800 may also be a so-called cell-to-pack structure that directly houses multiple energy storage devices 100 without constituting an energy storage module 500.

[0089] As described above, the specific methods of the technology disclosed herein can be exemplified by the methods described in the following items.

[0090] Item 1:

[0091] A battery storage pack, wherein the battery storage pack comprises:

[0092] Multiple energy storage devices; and

[0093] The housing has a receiving space for accommodating the plurality of energy storage devices.

[0094] The housing has:

[0095] The main body portion, said main body portion having a bottom surface; and

[0096] A bottom cover, which covers the lower side of the bottom surface of the main body.

[0097] On the lower side of the bottom surface of the main body, there are openings, vents, and recesses.

[0098] The opening is formed at a predetermined location and is covered by a breathable sheet.

[0099] The vent is located at a position on the outer periphery of the bottom surface, away from the opening.

[0100] The recess extends from the opening to the vent.

[0101] The bottom surface overlaps at the periphery of the recess.

[0102] The bottom cover has at least one through hole in the region where the recess is formed, extending from the opening to the vent.

[0103] Item 2:

[0104] According to item 1, the energy storage pack has the through hole extending through the recess from the location where the opening is formed to the vent.

[0105] Item 3:

[0106] According to item 1 or 2, the energy storage pack wherein the through hole has a generally rectangular shape when viewed from the opening.

[0107] Item 4:

[0108] According to any one of claims 1 to 3, the battery pack is composed of at least one selected from fluororesin, polyolefin resin and polyester resin.

Claims

1. A battery storage pack, wherein, The battery pack includes: Multiple energy storage devices; and The housing has a receiving space for accommodating the plurality of energy storage devices. The housing has: The main body portion, said main body portion having a bottom surface; and A bottom cover, which covers the lower side of the bottom surface of the main body. On the lower side of the bottom surface of the main body, there are openings, vents, and recesses. The opening is formed at a predetermined location and is covered by a breathable sheet. The vent is located at a position on the outer periphery of the bottom surface, away from the opening. The recess extends from the opening to the vent. The bottom surface overlaps at the periphery of the recess. The bottom cover has at least one through hole in the region where the recess is formed, extending from the opening to the vent.

2. The energy storage pack as described in claim 1, wherein, The through hole extends transversely through the recess from the location where the opening is formed to the vent.

3. The energy storage pack as described in claim 1 or 2, wherein, The through hole is roughly rectangular in shape when viewed from the opening.

4. The energy storage pack as described in claim 1 or 2, wherein, The sheet is composed of at least one selected from fluororesins, polyolefin resins, and polyester resins.

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