WO2024058235A1 - Power storage device - Google Patents

Power storage device Download PDF

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Publication number
WO2024058235A1
WO2024058235A1 PCT/JP2023/033467 JP2023033467W WO2024058235A1 WO 2024058235 A1 WO2024058235 A1 WO 2024058235A1 JP 2023033467 W JP2023033467 W JP 2023033467W WO 2024058235 A1 WO2024058235 A1 WO 2024058235A1
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WO
WIPO (PCT)
Prior art keywords
power storage
storage element
element unit
exterior body
axis direction
Prior art date
Application number
PCT/JP2023/033467
Other languages
French (fr)
Japanese (ja)
Inventor
博人 伊吹
惣一 坂口
Original Assignee
株式会社Ｇｓユアサ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社Ｇｓユアサ filed Critical 株式会社Ｇｓユアサ
Publication of WO2024058235A1 publication Critical patent/WO2024058235A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/271—Lids or covers for the racks or secondary casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs

Definitions

  • the present invention relates to a power storage device that includes a power storage element unit having one or more power storage elements and an exterior body.
  • the secondary battery pack disclosed in Patent Document 1 includes an exterior case having an openable and closable lid, and a plurality of single cells housed in the exterior case.
  • the lid body is provided with a fixture that protrudes toward the inside of the outer case and presses the outer surface of the unit cell to fix the unit cell to the outer case.
  • the conventional secondary battery pack described above employs a structure in which the fixture is arranged on the lid so that its lower end surface is pressed against the upper surface of the single cell. Therefore, due to the existence of a tolerance in the vertical length of the fixture and/or the existence of a tolerance in the height of the unit cell, the force with which the fixture presses the unit cell becomes insufficient or excessive. there is a possibility.
  • the present invention was made by the inventor of the present invention newly paying attention to the above-mentioned problem, and an object of the present invention is to provide a power storage device in which the stability of the position of a power storage element unit inside an exterior body is improved. .
  • a power storage device includes a power storage element unit having one or more power storage elements, and an exterior body that houses the power storage element unit, and a wall portion of the exterior body in a first direction and a power storage element unit that accommodates the power storage element unit.
  • a first member connected to at least one of the wall portion and the power storage element unit is disposed between the power storage unit and the power storage element unit, and the power storage element unit further faces the first member in the first direction.
  • the first member has a fusion portion provided at an end in the first direction.
  • a power storage device includes a power storage element unit having one or more power storage elements, and an exterior body that houses the power storage element unit, and a wall portion of the exterior body in a first direction and a power storage element unit that accommodates the power storage element unit.
  • a first member is disposed between the unit and the first member, and the first member and the wall portion are connected by a fusion portion provided at an end of the first member in the first direction. .
  • the present invention it is possible to provide a power storage device in which the stability of the position of the power storage element unit inside the exterior body is improved.
  • FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment.
  • FIG. 2 is an exploded perspective view of the power storage device according to the embodiment.
  • FIG. 3 is an exploded perspective view of the power storage element unit according to the embodiment.
  • FIG. 4 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to the embodiment.
  • FIG. 5 is a bottom view of the lid of the exterior body according to the embodiment.
  • FIG. 6 is a top view of a bus bar holder, which is an example of the second member according to the embodiment.
  • FIG. 7 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to Modification 1 of the embodiment.
  • FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment.
  • FIG. 2 is an exploded perspective view of the power storage device according to the embodiment.
  • FIG. 3 is an exploded perspective view of the power storage element unit according to the embodiment.
  • FIG. 4 is
  • FIG. 8 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to Modification 2 of the embodiment.
  • FIG. 9 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to Modification 3 of the embodiment.
  • FIG. 10 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to Modification 4 of the embodiment.
  • FIG. 11 is a sectional view showing the configuration of a power storage device including a first member disposed between a side wall of an exterior body and a power storage element unit.
  • a power storage device includes a power storage element unit having one or more power storage elements, and an exterior body housing the power storage element unit, and a wall portion of the exterior body in a first direction
  • a first member connected to at least one of the wall and the power storage element unit is arranged between the power storage element unit and the power storage element unit, and the power storage element unit is further connected to the first member and the first direction.
  • the first member has a fusion portion provided at an end in the first direction.
  • the first member disposed between the wall of the exterior body and the power storage element unit restricts at least the movement of the power storage element unit in the direction toward the wall. Furthermore, a melting section is provided at the end of the first member.
  • the end of the first member facing the wall of the exterior body or the power storage element unit is once melted and then cooled along the connection target (wall or second member).
  • a molten part, which is a solidified part can be formed.
  • the position or shape of the fusion part is formed according to the position or shape of the connection target (wall part or second member). Therefore, for example, the first member can be arranged so as to effectively limit movement of the power storage element unit while absorbing tolerances of the power storage element unit or the first member. Thereby, the stability of the position of the power storage element unit inside the exterior body can be improved.
  • the first member and at least one of the wall portion and the second member may be welded at the melting portion.
  • the first member and at least one of the wall portion of the exterior body and the power storage element unit are fixed by welding. Therefore, the first member can restrict not only the movement of the power storage element unit in the direction approaching the wall (one side in the first direction) but also the movement in the direction perpendicular to the first direction.
  • the one or more power storage elements are a plurality of power storage elements arranged in a second direction orthogonal to the first direction, and the At least a portion of the second member is located between the plurality of power storage elements and the wall in the first direction, and two or more of the plurality of power storage elements in the second direction
  • the power storage element may be arranged over the power storage element.
  • the first member is arranged between the second member, which is arranged across two or more power storage elements such as a bus bar holder included in the power storage element unit, and the wall of the exterior body. Therefore, movement of two or more power storage elements can be restricted by one first member. Thereby, the movement of each of the plurality of power storage elements included in the power storage element unit can be efficiently restricted using a relatively small number of first members. This is advantageous in simplifying the structure for improving the stability of the position of a power storage element unit having a plurality of power storage elements.
  • three or more first members distributed and arranged within a plane orthogonal to the first direction are arranged between the wall of the exterior body and the second member.
  • the positions of the two or more power storage elements in the first direction are restricted in a well-balanced manner within the space of the exterior body.
  • the exterior body includes an exterior body body having an opening large enough to allow insertion of the energy storage element unit, and the opening and a lid that closes the lid, and the wall portion may be a part of the lid.
  • the first member can be placed from above the power storage element unit. Therefore, for example, the work of arranging the first member that involves the formation of the melted portion can be performed with high precision.
  • a power storage device includes a power storage element unit having one or more power storage elements, and an exterior body housing the power storage element unit, and a wall portion of the exterior body in a first direction
  • a first member is disposed between the power storage element unit and the first member and the wall portion are connected by a fused portion provided at an end of the first member in the first direction. It may be said that it has been done.
  • the first member disposed between the wall of the exterior body and the power storage element unit restricts at least the movement of the power storage element unit in the direction toward the wall. Furthermore, the wall portion of the exterior body and the first member are connected by a fused portion. That is, when assembling the power storage device, a melted portion is formed, which is a portion that cools and hardens along the wall after the end of the first member facing the wall of the exterior body is once melted. Thereby, the position or shape of the fusion zone is formed according to the position or shape of the wall. Therefore, for example, the first member can be arranged so as to effectively restrict movement of the power storage element unit while absorbing tolerances of the power storage element unit and/or the first member. Thereby, the stability of the position of the power storage element unit inside the exterior body can be improved.
  • the longitudinal direction of the exterior body of the power storage device or the direction in which the short sides of one power storage element face each other is defined as the X-axis direction.
  • the lateral direction of the exterior body of the power storage device or the direction in which a plurality of power storage elements are arranged is defined as the Y-axis direction.
  • the direction in which the exterior body and the lid are lined up or the vertical direction in the exterior body of the power storage device is defined as the Z-axis direction.
  • These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in this embodiment). Note that depending on the mode of use, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below.
  • the X-axis plus direction indicates the arrow direction of the X-axis
  • the X-axis minus direction indicates the opposite direction to the X-axis plus direction.
  • X-axis direction it means both directions or either direction parallel to the X-axis.
  • FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment.
  • FIG. 2 is an exploded perspective view of power storage device 1 according to the embodiment.
  • FIG. 2 shows a state in which the lid 120 of the exterior body 10 is separated from the exterior body 110 and the power storage element unit 15 is exposed.
  • FIG. 3 is an exploded perspective view of the power storage element unit 15 according to the embodiment.
  • the power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment.
  • the rectangular parallelepiped here is a hexahedron in which all sides are rectangular or square.
  • the power storage device 1 is, for example, a battery module (battery assembly) used for power storage, power supply, or the like.
  • the power storage device 1 is used for driving or starting an engine of a moving object such as a car, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. It is used as a battery etc.
  • Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles.
  • Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor.
  • the power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.
  • power storage device 1 includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses power storage element unit 15.
  • the power storage device 1 includes electrical equipment such as a circuit board, a relay, and a connector that monitors or controls the charging state and discharging state of the power storage element 20, and an electrical connection between the electrical equipment and the power storage element 20. Although it may be provided with electric wires etc. connected to, illustration and explanation of these are omitted.
  • the exterior body 10 is a substantially rectangular parallelepiped-shaped (box-shaped) container (module case) that constitutes the outer shell of the power storage device 1 .
  • the exterior body 10 is a member that protects the power storage element unit 15 from impacts and the like.
  • the exterior body 10 is made of, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET), etc.
  • the material forming the exterior body 10 is not limited to the above resin, and metals such as iron or aluminum alloy may be employed as the material forming the exterior body 10.
  • the exterior body 10 has an exterior body body 110 that accommodates the power storage element unit 15, and a lid body 120 that closes the opening 111 of the exterior body body 110.
  • the exterior body 110 is a bottomed rectangular cylindrical housing in which an opening 111 (see FIG. 2) is formed with a size into which the power storage element unit 15 can be inserted.
  • the exterior main body 110 has a pair of side walls 112 facing each other in the Y-axis direction, a pair of side walls 113 facing each other in the X-axis direction, and a bottom wall part not shown in FIG. 2. .
  • the lid 120 is a rectangular member that closes the opening 111 of the exterior main body 110, and in this embodiment has a rectangular cylindrical shape with a bottom. Specifically, the lid 120 includes a pair of side walls 122 facing each other in the Y-axis direction, a pair of side walls 123 facing each other in the X-axis direction, and a wall 125 forming the top wall of the exterior body 10. has. As shown in FIGS. 1 and 2, the lid body 120 is provided with a positive external terminal 91 and a negative external terminal 92. External terminals 91 and 92 are electrically connected to one or more power storage elements 20 included in power storage element unit 15 . Power storage device 1 charges electricity from the outside via these external terminals 91 and 92, and discharges electricity to the outside.
  • the external terminals 91 and 92 are made of, for example, a conductive member made of metal such as aluminum or aluminum alloy.
  • the power storage element unit 15 has one or more power storage elements 20.
  • power storage element unit 15 includes four power storage elements 20. More specifically, the power storage element unit 15 includes a power storage element row 25, a busbar holder 51, and a plurality of busbars 60.
  • the power storage element row 25 includes four power storage elements 20 arranged in the Y-axis direction, and spacers 70 arranged at each end in the Y-axis direction.
  • the Y-axis direction is an example of the second direction.
  • the pair of spacers 70 are, for example, members called "end spacers" or "end holders.” Spacer 70 is a member that protects and/or holds power storage element 20 adjacent to spacer 70 .
  • Bus bar holder 51 is an example of second member 50, and in this embodiment is an insulating member made of an insulating material such as resin.
  • the busbar holder 51 has a plurality of busbar openings 59 (see FIG. 3) that determine the position of the busbar 60 by placing the busbar 60 therein.
  • Examples of the material for forming the spacer 70 and the bus bar holder 51 include resins such as PP, PC, or PE that can be used as the material for the exterior body 10.
  • Each of the spacer 70 and the bus bar holder 51 may be formed by applying insulation treatment (resin coating, etc.) to the surface of a metal base material.
  • the power storage element unit 15 includes an inter-cell spacer or an inter-cell holder arranged between two adjacent power storage elements 20, an insulating film arranged along the power storage elements 20, and a power storage element row. 25 in the Y-axis direction, but illustrations and explanations of these are omitted.
  • the power storage element 20 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, it is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. .
  • the power storage elements 20 have a flat rectangular parallelepiped (prismatic) shape, and in this embodiment, four power storage elements 20 are arranged in the Y-axis direction as described above.
  • the power storage element 20 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor.
  • the power storage element 20 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it.
  • Power storage element 20 may be a battery using a solid electrolyte.
  • the power storage element 20 may be a pouch type power storage element.
  • the shape of the power storage element 20 is not limited to the above-mentioned rectangular shape, and may be other shapes such as a polygonal columnar shape, a cylindrical shape, an elliptical columnar shape, an elongated columnar shape, etc.
  • the power storage element 20 includes a metal container 21.
  • the container 21 is a rectangular case having a pair of long sides 21a facing each other, a pair of short sides 21b facing each other, and a bottom face 21d. Inside the container 21, an electrode body, a current collector, an electrolytic solution, etc. are housed.
  • each of the plurality of power storage elements 20 is arranged in a line in the Y-axis direction with the long side surface 21a facing the Y-axis direction (the short side surface 21b being parallel to the Y-axis direction). .
  • the lid plate 21c of the container 21 is provided with metal electrode terminals 22 (a positive electrode terminal and a negative electrode terminal) that are electrically connected to an electrode body inside the container 21.
  • the electrode terminal 22 is arranged to protrude upward (in the Z-axis positive direction) from the lid plate 21c of the container 21.
  • the lid plate 21c of the container 21 is further provided with a gas discharge valve 23 for discharging the internal gas to the outside when the internal pressure of the container 21 increases excessively.
  • the bus bar 60 is a plate-shaped member that is placed on at least one power storage element 20 while being held by the bus bar holder 51 and connected to the electrode terminal 22 of the at least one power storage element 20 .
  • the bus bar 60 is made of a conductive member made of metal, such as copper, copper alloy, aluminum, or aluminum alloy. As shown in FIGS. 2 and 3, in this embodiment, three bus bars 60 are used to connect power storage elements 20 in series.
  • a bus bar 60b is connected to the positive electrode (total positive terminal) of a group of 20 power storage elements 20 that are made up of four power storage elements 20 connected in series. All positive terminals of the 20 groups of power storage elements are electrically connected to an external terminal 91 via a bus bar 60b.
  • a bus bar 60a is connected to the positive and negative electrodes (total negative terminals) of the 20 groups of power storage elements. All negative terminals of the 20 groups of power storage elements are electrically connected to an external terminal 92 via a bus bar 60a.
  • the power storage device 1 having such a basic configuration, inside the exterior body 10 there is a power storage device not shown in FIGS. Some materials are provided.
  • the power storage device 1 employs a structure in which movement of the power storage element unit 15 is restricted by this first member. The configuration of the first member and its surroundings according to the present embodiment will be described below with reference to FIGS. 4 to 6.
  • FIG. 4 is a cross-sectional perspective view showing the configuration of the first member 80 and its surroundings according to the embodiment.
  • a cross section of a portion of power storage device 1 taken along the YZ plane passing through line IV-IV in FIG. 3 is shown in a perspective view.
  • FIG. 5 is a bottom view of the lid 120 of the exterior body 10 according to the embodiment.
  • the end of the first member 80 in the negative Z-axis direction, before being melted, is labeled with a symbol "85" indicating a melted portion.
  • FIG. 6 is a top view of the bus bar holder 51, which is an example of the second member 50 according to the embodiment.
  • FIG. 5 is a top view of the bus bar holder 51, which is an example of the second member 50 according to the embodiment.
  • the range of the facing portion 55 that is the portion facing the first member 80 in the bus bar holder 51 is represented by a hatched area, and the approximate area of the power storage element 20 hidden by the bus bar holder 51 is shown.
  • the outline is represented by a broken line.
  • power storage device 1 includes a first member 80 disposed between wall portion 125 of exterior body 10 and power storage element unit 15.
  • first member 80 is provided in power storage device 1 as a structure integrated with lid 120 having wall portion 125.
  • the first member 80 is connected to the side wall 122 and wall 125 of the lid 120, and in FIG. 4, the boundary between the first member 80 and the side wall 122 and wall 125 is indicated by a broken line. It is expressed as.
  • the first member 80 has a melting part 85 provided at the end in the Z-axis direction.
  • the Z-axis direction is an example of the first direction.
  • the first direction is the direction in which the wall portion 125 of the exterior body 10 and the power storage element unit 15 are lined up. That is, the first member 80 is arranged between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction. Therefore, the first direction is the direction in which the wall portion 125 of the exterior body 10 and the first member 180 are lined up, and also the direction in which the first member 180 and the power storage element unit 15 are lined up.
  • the first member 80 is provided with a melting portion 85 at the end facing the bus bar holder 51, which is the second member 50, that is, at the end in the negative Z-axis direction.
  • Melted portion 85 is a portion that is melted during assembly of power storage device 1 and then cooled and solidified. Therefore, as shown in FIG. 4, the melted portion 85 is formed in a shape along the opposing portion 55 at the position of the opposing portion 55 of the bus bar holder 51.
  • the opposing portion 55 is a portion formed by the bus bar holder 51, and is a portion facing the first member 80 in the Z-axis direction.
  • first member 80 be integrated with the lid body 120, and a member separate from the exterior body 10 may be arranged as the first member 80. Furthermore, the position of the melting portion 85 in the first member 80 is not necessarily at the end facing the bus bar holder 51, but rather at the end of the first member 80 facing the wall 125 of the exterior body 10. A section 85 may also be provided.
  • the power storage device 1 includes the power storage element unit 15 having one or more power storage elements 20 and the exterior body 10 that houses the power storage element unit 15.
  • a first member 80 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction).
  • the power storage element unit 15 further includes a second member 50 (bus bar holder 51 in this embodiment) that forms a facing portion 55 that faces the first member 80 in the Z-axis direction.
  • the first member 80 has a melting part 85 provided at an end in the Z-axis direction.
  • the first member 80 disposed between the wall 125 of the exterior body 10 and the power storage element unit 15 moves the power storage element unit 15 at least in the direction approaching the wall 125 of the power storage element unit 15 (Z-axis positive direction). ) movement is restricted. Furthermore, a melting section 85 is provided at the end of the first member 80. That is, when assembling the power storage device 1, after the end of the first member 80 is once melted, the melted part 85, which is a cooled and solidified part, is formed along the connection target (wall part 125 or bus bar holder 51). can. Thereby, the position or shape of the melted part 85 is formed according to the position or shape of the connection target (wall part 125 or bus bar holder 51).
  • the first member 80 is arranged with respect to the power storage element unit 15 so as to effectively limit the movement of the power storage element unit 15 while absorbing the tolerance of the power storage element unit 15 and/or the first member 80. can. That is, the force with which the first member 80 presses the power storage element unit 15 is unlikely to be insufficient or excessive. In this way, according to the power storage device 1 according to the present embodiment, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
  • the first member 80 is connected to the wall portion 125 of the exterior body 10, and the fused portion 85 is formed at the end of the first member 80 facing the bus bar holder 51. It is provided. As a result, the melted portion 85 is formed in a shape along the opposing portion 55 at the position of the opposing portion 55 of the bus bar holder 51 . More specifically, the first member 80 is connected to two walls (the wall 125 and the side wall 122 in FIG. 2) of the lid 120 that extend in directions that intersect with each other. Therefore, when pressing the melted end of the first member 80 against the bus bar holder 51, the first member 80 can easily maintain a posture parallel to the Z-axis direction. In other words, the first member 80 is unlikely to be deformed (bending or distorting) due to external force during pressing. As a result, the fused portion 85 of the first member 80 can be formed with high precision.
  • the first member 80 and the bus bar holder 51 are welded together at the welded portion 85.
  • the first member 80 is fixed to the power storage element unit 15 by welding. Therefore, the first member 80 can restrict not only the movement of the power storage element unit 15 in the direction approaching the wall portion 125 (the positive Z-axis direction) but also the movement in the direction orthogonal to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
  • the method of welding the first member 80 and the bus bar holder 51 there is no particular limitation on the method of welding the first member 80 and the bus bar holder 51.
  • methods employed for the welding include thermal welding, ultrasonic welding, and laser welding.
  • thermal welding the end portion of the first member 80 is melted by external heat, cooled and solidified, thereby forming a fused portion 85 that welds the end portion and the bus bar holder 51 together.
  • heat sealing may be employed. Heat sealing is a method of welding parts together using heat without using adhesives.
  • ultrasonic welding the end of the first member 80 is melted by frictional heat generated by ultrasonic vibration, and then cooled and solidified to form a fused portion 85 that welds the end and the bus bar holder 51 together.
  • the end of the first member 80 is melted by irradiation with a laser beam, and then cooled and solidified to form a fused portion 85 that welds the end to the bus bar holder 51 .
  • a chemical method may also be adopted as a method for welding the first member 80 and the bus bar holder 51. For example, by melting the end of the first member 80 using a solvent such as dichloromethane and then solidifying it, the melted portion 85 that welds the end and the bus bar holder 51 is formed.
  • the melted portion 85 When the melted portion 85 is formed by any of the various methods described above, at least a portion of the facing portion 55 of the second member 50 (busbar holder 51) may also be melted. That is, the first member 80 and the facing portion 55 of the bus bar holder 51 may be melted together at the melting portion 85 .
  • the melted portion 85 may include a portion of the bus bar holder 51 that is melted by the heat generated during the formation of the melted portion 85 . It is advantageous that the fused portion 85 includes a portion of the bus bar holder 51 from the viewpoint of improving the bonding strength between the first member 80 and the bus bar holder 51 in the fused portion 85. However, it is not essential that the fused portion 85 include a portion of the busbar holder 51.
  • the fused portion 85 may be formed along the unevenness of the surface of the facing portion 55 of the bus bar holder 51, so that the fused portion 85 may be joined to the bus bar holder 51. Even if the surface of the opposing portion 55 is a flat surface without irregularities, the melted portion 85 is formed in a shape along the plane at the position of the plane in the Z-axis direction. Therefore, the first member 80 can restrict at least the movement of the bus bar holder 51 in the Z-axis plus direction.
  • the melting part 85 be in contact with the busbar holder 51.
  • a gap may be formed between the bus bar holder 51 and the melted portion 85 due to contraction of the melted portion 85 as it cools and hardens.
  • the end portion of the first member 80 where the melting portion 85 is provided is located close to the bus bar holder 51 and facing the bus bar holder 51 in the Z-axis direction. Movement in the Z-axis plus direction can be restricted.
  • the fused portion 85 is in contact with the bus bar holder 51, and the fused portion 85 is welded to the bus bar holder 51. It is even more preferable.
  • the power storage element unit 15 included in the power storage device 1 includes a plurality of power storage elements 20, as shown in FIG. That is, the one or more power storage elements 20 included in the power storage device 1 are a plurality of power storage elements 20 arranged in line in the Y-axis direction orthogonal to the Z-axis direction. At least a portion of the bus bar holder 51 is located between the plurality of power storage elements 20 and the wall portion 125 in the Z-axis direction, and is located between two or more of the power storage elements 20 among the plurality of power storage elements 20 in the Y-axis direction. It is located throughout.
  • the bus bar holder 51 of the power storage element unit 15 is arranged across two or more power storage elements 20, and the bus bar holder 51 and the wall portion 125 of the exterior body 10 are connected to each other.
  • a first member 80 is arranged in between. Therefore, movement of two or more power storage elements 20 can be restricted by one first member 80. Thereby, the movement of each of the plurality of power storage elements 20 included in the power storage element unit 15 can be efficiently restricted by a relatively small number of first members 80. This is advantageous in simplifying the structure for improving the stability of the position of the power storage element unit 15 having the plurality of power storage elements 20.
  • three or more first members 80 are arranged between the wall portion 125 and the bus bar holder 51, as shown in FIG. .
  • Each of the three or more first members 80 is arranged at a position that does not overlap with each other when viewed from the Z-axis direction.
  • three or more first members 80 that are distributed and arranged within a plane perpendicular to the Z-axis direction are arranged between the wall portion 125 of the exterior body 10 and the bus bar holder 51.
  • the positions of the two or more power storage elements 20 in the Z-axis direction are restricted in a well-balanced manner within the space of the exterior body 10.
  • three or more first members 80 can be arranged so as to absorb the inclination.
  • the three or more first members 80 included in the power storage device 1 include three first members 80 that are not aligned on the same straight line in the XY plane.
  • At least two first members 80 may be arranged at positions that overlap with each other when viewed from the Z-axis direction. For example, if a tapered protrusion is provided on the wall 125 as the first member, even if a portion of the root portions (portions connected to the wall 125) of the two first members overlap, good. In this case, when viewed from the Z-axis direction, the two first members appear to overlap. However, the tip portions (the ends facing the power storage element unit 15) of the two first members are separated. Therefore, a fused portion can be formed at the tip portions of each of the two first members. That is, each of the two first members can restrict movement of the power storage element unit 15 independently of each other.
  • first members 80a to 80e which are five first members 80, are arranged, and each of the first members 80a to 80e 85 (any one of 85a to 85e). These first members 80a to 80e are distributed along the inner surfaces of the side walls 122 and 123 of the lid 120.
  • the bus bar holder 51 which is the second member 50
  • five opposing parts 55 are arranged at positions facing the first members 80a to 80e in the Z-axis direction.
  • the opposing portions 55a to 55e are distributed and arranged along the periphery of the bus bar holder 51, which is formed into a substantially rectangular shape when viewed from the Z-axis direction. That is, the bus bar holder 51 is restricted in its movement in the Z-axis plus direction by the first member 80 at each of the dispersed positions on its peripheral edge.
  • each of the melted parts 85a to 85e is welded to the opposing part 55 (any one of 55a to 55e) located at a position facing the melted part 85 in the Z-axis direction.
  • the bus bar holder 51 is fixed to the five first members 80, and as a result, the stability of the position of the bus bar holder 51 is further improved. That is, the stability of the position of the power storage element unit 15 including the bus bar holder 51 inside the exterior body 10 is further improved.
  • the first member 80 is arranged between the wall portion 125 of the lid 120 and the power storage element unit 15. That is, the exterior body 10 includes an exterior body body 110 having an opening 111 large enough to allow the power storage element unit 15 to be inserted therein, and a lid 120 that closes the opening 111 .
  • the wall portion 125 is a part of the lid body 120.
  • the first member 80 is placed from above the power storage element unit 15 through the opening 111. It can be carried out. Therefore, the work of arranging the first member 80 that involves the formation of the melted portion 85 can be performed with high precision.
  • the opening 111 of the exterior body main body 110 has a convex portion that protrudes toward the inside of the opening 111 when viewed from the Z-axis direction, and a portion of which is the power storage element unit 15 when viewed from the Z-axis direction. Overlapping convex portions may be arranged. Even if such a convex portion is disposed in the opening 111, the convex portion deforms or moves when the power storage element unit 15 is inserted into the opening 110, so that the power storage element unit 15 is disposed in the opening 110. It is sufficient if it can pass 110.
  • the convex portion may be a guide portion that guides movement of the power storage element unit 15.
  • a convex portion or the like may be arranged in the opening 111 that may apparently obstruct insertion of the power storage element unit 15 into the opening 111 . Even in this case, if the power storage element unit 15 can be accommodated inside the exterior body 110 through the opening 111, the opening 111 should be of a size that allows the power storage element unit 15 to be inserted. opening 111''.
  • the bus bar holder which is the second member 50, of the first member 80 is 51 can be placed. Therefore, when joining the lid 120 and the exterior body 110 by welding, the lower ends of the pair of side walls 122 and the pair of side walls 123 (see FIGS. 2 and 4) of the lid 120 are melted, and one or more The melting of the lower end of the first member 80 can be performed in a series of work steps. Thereby, the power storage device 1 in which the stability of the position of the power storage element unit 15 is improved can be efficiently manufactured.
  • the power storage device 1 has been described above, focusing on the configuration of the first member 80 and its surroundings.
  • the configuration of first member 80 and its surroundings in power storage device 1 may be different from the configuration shown in FIGS. 4 to 6. Therefore, a modified example of the configuration of the first member 80 and its surroundings will be described below, focusing on the differences from the above embodiment.
  • FIG. 7 is a sectional view showing the configuration of the first member 80 and its surroundings according to Modification 1 of the embodiment.
  • the position of the cross section in FIG. 7 corresponds to the position of the cross section in FIG. 4. This also applies to FIGS. 8 to 11, which will be described later.
  • a power storage device 1a includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15.
  • a first member 80 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction).
  • the power storage element unit 15 further includes a second member 50 that forms a facing portion 75 that faces the first member 80 in the Z-axis direction.
  • the first member 80 has a melting part 85 provided at an end in the Z-axis direction.
  • the second member 50 having the facing portion 75 is a spacer 70, and in this point, the power storage device 1a according to the present modification differs from the power storage device 1 according to the embodiment. That is, in this modification, the power storage element unit 15 does not need to have the bus bar holder 51.
  • the melting portion 85 of the first member 80 is provided at a position facing the end of the spacer 70 in the Z-axis plus direction.
  • the spacer 70 has a facing portion 75 that faces the first member 80 in the Z-axis direction. Therefore, the position and shape of the melting part 85 are formed according to the position and shape of the opposing part 75.
  • the first member 80 directly restricts the movement of the spacer 70 at least in the Z-axis positive direction, and the force with which the first member 80 presses the spacer 70 in the Z-axis negative direction is unlikely to become insufficient. , and is unlikely to become excessive.
  • the power storage element unit 15 including the spacer 70 is restricted from moving at least in the positive Z-axis direction.
  • spacer 70 has an upper wall portion 71 located in the positive Z-axis direction of power storage element 20 adjacent to spacer 70 . Therefore, by restricting the movement of the spacer 70 in the Z-axis plus direction, at least the movement of the power storage element 20 adjacent to the spacer 70 in the Z-axis plus direction is restricted. This contributes to improving the stability of the position of the power storage element unit 15. In this way, according to the power storage device 1a according to the present modification, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
  • the first member 80 is welded to the spacer 70 at a welded portion 85 that the first member 80 has.
  • the first member 80 can restrict not only the movement of the power storage element unit 15 in the positive Z-axis direction but also the movement in the direction perpendicular to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
  • FIG. 8 is a sectional view showing the configuration of a first member 180 and its surroundings according to a second modification of the embodiment.
  • a power storage device 1b according to this modification includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15.
  • a first member 180 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction).
  • the power storage element unit 15 further includes a second member 50 that forms a facing portion 55b that faces the first member 180 in the Z-axis direction.
  • the second member 50 according to this modification is a bus bar holder 51.
  • the first member 180 has a melting part 185 provided at an end in the Z-axis direction. These configurations are common to power storage device 1 according to the embodiment.
  • the opposing portion 55b which is the portion of the busbar holder 51 that faces the first member 180, serves as a virtual boundary surface (indicated by a broken line in FIG. 8) between the first member 180 and the busbar holder 51. stipulated.
  • the first member 180 is integrally provided with the bus bar holder 51, which is the second member 50. That is, the first member 180 is provided continuously from the bus bar holder 51, and the melting portion 185 is located at a position facing the wall portion 125.
  • power storage device 1b according to this modification differs from power storage device 1 according to the embodiment.
  • the power storage device 1b includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15.
  • a first member 180 is arranged between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction).
  • the first member 180 and the wall portion 125 are connected by a fusion portion 185 provided at an end of the first member 180 in the Z-axis direction.
  • the end of the first member 180 in the Z-axis direction is a range from the tip of the first member 180 on one side in the Z-axis direction to 1 ⁇ 3 of the total length of the first member 180 in the Z-axis direction.
  • the melting part 185 is provided at the end of the first member 180 that is connected to the bus bar holder 51 in advance, and which faces the wall part 125. Therefore, the position and shape of the melting part 185 are formed according to the position and shape of the wall part 125. Thereby, the force with which the first member 180 presses the bus bar holder 51 in the negative direction of the Z-axis is unlikely to be insufficient or excessive. As a result, according to the power storage device 1b including the first member 180, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
  • the first member 180 and the wall portion 125 of the exterior body 10 are welded together at a welded portion 185 that the first member 180 has.
  • the first member 180 can restrict not only the movement of the power storage element unit 15 in the positive Z-axis direction but also the movement in the direction perpendicular to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
  • FIG. 9 is a sectional view showing the configuration of a first member 280 and its surroundings according to a third modification of the embodiment.
  • a power storage device 1c according to this modification includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15.
  • a first member 280 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction).
  • the power storage element unit 15 further includes a second member 50 that forms a facing portion 55 that faces the first member 280 in the Z-axis direction.
  • the second member 50 according to this modification is a bus bar holder 51.
  • the first member 280 has a melting part provided at an end in the Z-axis direction.
  • the first member 280 has melted parts at both ends in the Z-axis direction, and in this point, the power storage device 1c according to the present modification is different from the power storage device 1 according to the embodiment. different.
  • the first member 280 is a member separate from the bus bar holder 51, which is the second member 50, and the wall portion 125 of the exterior body 10.
  • the material forming the first member 280 include resins such as PP, PC, and PE that can be used as the material for the exterior body 10.
  • the first member 280 has a melted portion 285a at the end in the negative Z-axis direction, that is, at the end facing the bus bar holder 51.
  • the first member 280 has a melted portion 285b at the end in the positive Z-axis direction, that is, at the end facing the wall 125. Therefore, the melted portion 285a is formed in a position and shape corresponding to the facing portion 55 of the bus bar holder 51. Further, the melting portion 285b is formed in a position and shape corresponding to the position and shape of the wall portion 125. Thereby, the force with which the first member 280 presses the bus bar holder 51 in the negative direction of the Z-axis is unlikely to be insufficient or excessive. As a result, according to the power storage device 1c including the first member 280, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
  • the first member 280 and the bus bar holder 51 of the power storage element unit 15 are welded together at a welded portion 285a that the first member 280 has. Furthermore, the first member 280 and the wall portion 125 of the exterior body 10 are welded together at a welded portion 285b that the first member 280 has.
  • the first member 280 can restrict not only the movement of the power storage element unit 15 in the positive Z-axis direction but also the movement in the direction perpendicular to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
  • FIG. 10 is a sectional view showing the configuration of a first member 380 and its surroundings according to a fourth modification of the embodiment.
  • a power storage device 1d according to this modification includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15.
  • a first member 380 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction).
  • the power storage element unit 15 further includes a second member 50 that forms a facing portion 55d that faces the first member 380 in the Z-axis direction.
  • the second member 50 according to this modification is a bus bar holder 51.
  • the first member 380 has a melting part 385 provided at an end in the Z-axis direction.
  • the bus bar holder 51 which is the second member 50, has a protrusion 480 that protrudes in the Z-axis plus direction, and the end (tip) of the protrusion 480 in the Z-axis plus direction allows the bus bar holder 51 to be connected to the opposing part. 55d is formed.
  • power storage device 1d according to the present modification differs from power storage device 1 according to the embodiment. More specifically, in this modification, the first member 380 is provided integrally with the wall portion 125 of the exterior body 10, and the first member 380 is a protrusion provided integrally with the bus bar holder 51, which is the second member 50. A melting portion 385 is provided at a position facing the portion 480 in the Z-axis direction.
  • the melting portion 385 is formed in a position and shape corresponding to the facing portion 55d of the bus bar holder 51. Therefore, the force with which the first member 380 presses the bus bar holder 51 in the negative direction of the Z-axis is unlikely to be insufficient or excessive. As a result, according to the power storage device 1d including the first member 380, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
  • the first member 380 and the protruding portion 480 of the bus bar holder 51 are welded together at a welded portion 385 that the first member 380 has.
  • the first member 380 can restrict not only the movement of the power storage element unit 15 in the positive Z-axis direction but also the movement in the direction perpendicular to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
  • the first member 380 shown in FIG. 10 does not have to be integrated with the wall portion 125 of the exterior body 10.
  • the first member 380 may be arranged between the wall 125 and the power storage element unit 15 by connecting a member separate from the wall 125 to the wall 125 by welding, adhesion, or the like.
  • the protruding portion 480 does not need to be integrated with the bus bar holder 51, which is the second member 50.
  • a member separate from the bus bar holder 51 may be connected to the wall portion 125 by welding, adhesive, or the like. Even in this case, the protrusion 480 of the bus bar holder 51 that is connected to the first member 380 at the melting part 385 can be realized by the member.
  • protrusion 480 is first member 480d disposed between wall 125 of exterior body 10 and power storage element unit 15. That is, it can be explained that the first member 480d is provided integrally with the bus bar holder 51, and the wall portion 125 of the exterior body 10 has a protrusion portion 380d that protrudes in the negative direction of the Z-axis. In this configuration, the first member 480d has a fused portion 485 at a position facing the protruding portion 380d, which is a part of the wall portion 125 of the exterior body 10, in the Z-axis direction.
  • the melted portion 485 is formed in a position and shape corresponding to the end of the protruding portion 380d in the Z-axis minus direction. Therefore, the force with which the first member 480d presses the bus bar holder 51 in the negative direction of the Z-axis is unlikely to be insufficient or excessive. As a result, the stability of the position of power storage element unit 15 inside exterior body 10 is improved.
  • the ratio of the lengths of the protruding portion 480 and the first member 380 in the Z-axis direction there is no particular limitation on the ratio of the lengths of the protruding portion 480 and the first member 380 in the Z-axis direction.
  • One of the protrusion 480 and the first member 380 may be longer than the other.
  • the widths of the protruding portion 480 and the first member 380 in the Y-axis direction or the X-axis direction there is no particular limitation on the ratio of these widths.
  • One of the protrusion 480 and the first member 380 may have a wider width than the other.
  • the width of the protrusion 480 is larger than the width of the first member 380 in the Y-axis direction, even if the protrusion 480 and the first member 380 are misaligned, during thermal welding (for example, heat sealing) Since the positional deviation can be tolerated, the protrusion 480 and the first member 380 can be joined more easily.
  • thermal welding for example, heat sealing
  • the power storage device 1 includes five first members 80 as shown in FIG. 5 .
  • power storage device 1 only needs to include at least one first member 80 . That is, one first member 80 is disposed between the second member 50 and the wall portion 125, and the fused portion 85 is provided at at least one of both ends of the first member 80 in the Z-axis direction. It is sufficient if it is provided. As a result, movement of the power storage element unit 15 at least in the Z-axis plus direction is restricted by the one first member 80 . Furthermore, since the one first member 80 has the melted portion 85, the force that presses the second member 50 in the negative Z-axis direction is unlikely to be insufficient or excessive.
  • the shape of the first member 80 when viewed from the negative Z-axis direction does not need to be the shape shown in FIG. 5.
  • the shape of the portion of the first member 80 that forms the melted portion 85 may be a polygon other than a rectangle such as a triangle, or may be an ellipse or an ellipse. You can.
  • the widths of the first members 80a, 80b, 80d, and 80e in the X-axis direction and the Y-axis direction in FIG. 5 do not need to be the widths shown in FIG.
  • the first member 80 having a width approximately equal to the width in the X-axis direction of the power storage element row 25 may be arranged inside at least one of the pair of side wall portions 122.
  • a first member 80 having a width approximately equal to the width of the power storage element row 25 (see FIGS. 2 and 3) in the Y-axis direction may be arranged inside at least one of the pair of side wall portions 123.
  • the elongated first member 80 when the elongated first member 80 is disposed between the wall portion 125 and the second member 50 in the direction orthogonal to the Z-axis direction, only a part of the first member 80 in the longitudinal direction is disposed in the direction perpendicular to the Z-axis direction. It is conceivable that the first member 80 is connected to the second member 50, or that the force with which the first member 80 presses the second member 50 is concentrated in a portion in the longitudinal direction. However, in the first member 80 according to the embodiment described above, the melting portion 85 is provided at the end facing the second member 50. Therefore, the first member 80 can be easily connected to the second member 50 over the entire length in the longitudinal direction, and the force for pressing the second member 50 is unlikely to be concentrated on a part in the longitudinal direction.
  • FIG. 11 is a cross-sectional view showing the configuration of a power storage device 1e including a first member 580 disposed between the side wall portion 112 of the exterior body 10 and the power storage element unit 15. Power storage device 1e will be explained as follows.
  • a first member 580 connected to at least one of the side wall 112 and the power storage element unit 15 is provided between the wall (side wall 112) of the exterior body 10e in the Y-axis direction and the power storage element unit 15. is located.
  • the power storage element unit 15 further includes a second member 50 (spacer 70) that forms a facing portion 55e that faces the first member 580 in the Z-axis direction.
  • the first member 580 has a melting portion 585 provided at an end in the Z-axis direction.
  • the Y-axis direction is an example of the first direction.
  • the first member 580 restricts at least the movement of the power storage element unit 15 in the direction approaching the side wall portion 112 (Y-axis positive direction). Further, by providing the melting portion 585 at the end of the first member 580 facing the spacer 70, the melting portion 85 is formed along the position or shape of the spacer 70. As a result, the force (force in the negative direction of the Y-axis) exerted by the first member 580 to press down the power storage element unit 15 is unlikely to be insufficient or excessive. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10e is improved.
  • the second member 50 that forms a portion of the power storage element unit 15 that faces the first member 580 in the Y-axis direction may be the bus bar holder 51 instead of the spacer 70.
  • the first member 580 may be arranged between the wall portion of the exterior body 10e (the side wall portion 113, see FIG. 2) and the power storage element unit 15 in the X-axis direction, which is another example of the first direction.
  • an inter-cell holder or an insulating film (not shown) included in the power storage element unit 15 may function as the second member 50 that forms a portion facing the first member 580 in the X-axis direction.
  • the exterior body 10e When the first member 580 is disposed between the wall portion (side wall portion 112 or 113) of the exterior body 10e and the power storage element unit 15 in the Y-axis direction or the X-axis direction, the exterior body 10e has the wall portion 125.
  • the lid 120 may not be provided. That is, the exterior body 10e may be composed of only the exterior body body 110.
  • the first member 280 shown in FIG. 9, the first member 380 and the protrusion part 480 shown in FIG. 10 are similar to the first member 580 shown in FIG. It may be arranged between the wall portion (side wall portion 112 or 113) and the power storage element unit 15.
  • the second member 50 on the opposite side of the wall portion 125 of the exterior body 10 with the first member 80 in between is not limited to the bus bar holder 51 or the spacer 70.
  • an inner lid or an electrical component tray disposed between the power storage element array 25 and the wall portion 125 of the exterior body 10 may be disposed as the second member 50 that is directly pressed by the first member 80.
  • An inter-cell holder that holds at least two power storage elements 20 lined up in the Y-axis direction may be employed as the second member 50.
  • a plurality of second members 50 forming a portion facing the first member 80 in the Z-axis direction may be arranged with respect to one first member 80.
  • one first member 80 may collectively press a plurality of second members 50 located at opposing positions in the Z-axis direction. Also by this, the movement of each of the plurality of power storage elements 20 included in the power storage element unit 15 can be efficiently restricted by a relatively small number of first members 80.
  • the direction in which the plurality of power storage elements 20 included in the power storage element unit 15 are arranged is not limited to the Y-axis direction.
  • the plurality of power storage elements 20 may be arranged in the X-axis direction or in the Z-axis direction.
  • the shape of the exterior body 10 does not need to be a substantially rectangular parallelepiped shape (box shape).
  • the first member may be disposed inside an exterior body that includes a cylindrical exterior body body with one end closed and a lid body that is circular in plan view and closes a circular opening. Even in this case, by disposing the first member having the melting part at the end between a part of the circular lid body and the power storage element unit housed in the exterior body, Movement of the power storage element unit is restricted. Furthermore, the force with which the power storage element unit is pressed by the first member is unlikely to be insufficient or excessive.
  • the exterior body 10 does not need to have a structure that seals the inside.
  • one or more through holes may be provided in a wall such as the side wall 112.
  • a structure formed by combining a plurality of rod-shaped members (frames) may be employed as the exterior body that houses the power storage element unit 15.
  • the present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.
  • Second member 51 Bus bar holder 55, 55a, 55b, 55c, 55d, 55e, 55f, 75 Opposing part 70 Spacer 71 Upper wall portion 80, 80a, 80b, 80c, 80d, 80e, 180, 280, 380, 480d, 580 First member 85, 85a, 85b, 85c, 85d, 85e, 185, 285a, 285b, 385, 485 , 585 melting part 110 exterior main body 111 opening 112, 113, 122, 123 side wall 120 lid 125 wall 380d, 480 protrusion

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  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

This power storage device is provided with: a power storage element unit which comprises one or more power storage elements; and an outer package which contains the power storage element unit. A first member is arranged between a wall part of the outer package and the power storage element unit in a first direction, while being connected to at least one of the wall part and the power storage element unit. The power storage element unit additionally comprises a second member which forms a facing part where the second member faces the first member in the first direction. The first member has a melt part which is provided at an end in the first direction.

Description

蓄電装置Power storage device
　本発明は、１以上の蓄電素子を有する蓄電素子ユニットと外装体とを備える蓄電装置に関する。 The present invention relates to a power storage device that includes a power storage element unit having one or more power storage elements and an exterior body.
　特許文献１に開示された二次電池パックは、開閉可能な蓋体を有する外装ケースと、この外装ケースに収容される複数の単セルとを備える。蓋体には、外装ケースの内部側へ突出し、かつ単セルの外面を押さえ付けることによって当該単セルを外装ケースに固定する固定具が設けられている。 The secondary battery pack disclosed in Patent Document 1 includes an exterior case having an openable and closable lid, and a plurality of single cells housed in the exterior case. The lid body is provided with a fixture that protrudes toward the inside of the outer case and presses the outer surface of the unit cell to fix the unit cell to the outer case.
特開２０１５－２２９０９号公報Japanese Patent Application Publication No. 2015-22909
　上記従来の二次電池パックでは、固定具を、その下端面が単セルの上面に押し付けられるように蓋体に配置する構造が採用されている。従って、固定具の上下方向の長さについての公差の存在、または／及び、単セルの高さについての公差の存在に起因して、固定具が単セルを押さえる力が不十分または過大となる可能性がある。 The conventional secondary battery pack described above employs a structure in which the fixture is arranged on the lid so that its lower end surface is pressed against the upper surface of the single cell. Therefore, due to the existence of a tolerance in the vertical length of the fixture and/or the existence of a tolerance in the height of the unit cell, the force with which the fixture presses the unit cell becomes insufficient or excessive. there is a possibility.
　本発明は、本願発明者が上記課題に新たに着目することによってなされたものであり、外装体の内部における蓄電素子ユニットの位置の安定性が向上された蓄電装置を提供することを目的とする。 The present invention was made by the inventor of the present invention newly paying attention to the above-mentioned problem, and an object of the present invention is to provide a power storage device in which the stability of the position of a power storage element unit inside an exterior body is improved. .
　本発明の一態様に係る蓄電装置は、１以上の蓄電素子を有する蓄電素子ユニットと、前記蓄電素子ユニットを収容する外装体とを備え、第一方向における前記外装体の壁部と前記蓄電素子ユニットとの間には、前記壁部及び前記蓄電素子ユニットの少なくとも一方に接続された第一部材が配置されており、前記蓄電素子ユニットはさらに、前記第一部材と前記第一方向で対向する部分を形成する第二部材を有し、前記第一部材は、前記第一方向の端部に設けられた溶融部を有する。 A power storage device according to one aspect of the present invention includes a power storage element unit having one or more power storage elements, and an exterior body that houses the power storage element unit, and a wall portion of the exterior body in a first direction and a power storage element unit that accommodates the power storage element unit. A first member connected to at least one of the wall portion and the power storage element unit is disposed between the power storage unit and the power storage element unit, and the power storage element unit further faces the first member in the first direction. The first member has a fusion portion provided at an end in the first direction.
　本発明の一態様に係る蓄電装置は、１以上の蓄電素子を有する蓄電素子ユニットと、前記蓄電素子ユニットを収容する外装体とを備え、第一方向における前記外装体の壁部と前記蓄電素子ユニットとの間には、第一部材が配置されており、前記第一部材と前記壁部とは、前記第一部材の前記第一方向の端部に設けられた溶融部で接続されている。 A power storage device according to one aspect of the present invention includes a power storage element unit having one or more power storage elements, and an exterior body that houses the power storage element unit, and a wall portion of the exterior body in a first direction and a power storage element unit that accommodates the power storage element unit. A first member is disposed between the unit and the first member, and the first member and the wall portion are connected by a fusion portion provided at an end of the first member in the first direction. .
　本発明によれば、外装体の内部における蓄電素子ユニットの位置の安定性が向上された蓄電装置を提供することができる。 According to the present invention, it is possible to provide a power storage device in which the stability of the position of the power storage element unit inside the exterior body is improved.
図１は、実施の形態に係る蓄電装置の外観を示す斜視図である。FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. 図２は、実施の形態に係る蓄電装置の分解斜視図である。FIG. 2 is an exploded perspective view of the power storage device according to the embodiment. 図３は、実施の形態に係る蓄電素子ユニットの分解斜視図である。FIG. 3 is an exploded perspective view of the power storage element unit according to the embodiment. 図４は、実施の形態に係る第一部材及びその周辺の構成を示す断面斜視図である。FIG. 4 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to the embodiment. 図５は、実施の形態に係る外装体の蓋体の底面図である。FIG. 5 is a bottom view of the lid of the exterior body according to the embodiment. 図６は、実施の形態に係る第二部材の一例であるバスバーホルダの上面図である。FIG. 6 is a top view of a bus bar holder, which is an example of the second member according to the embodiment. 図７は、実施の形態の変形例１に係る第一部材及びその周辺の構成を示す断面斜視図である。FIG. 7 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to Modification 1 of the embodiment. 図８は、実施の形態の変形例２に係る第一部材及びその周辺の構成を示す断面斜視図である。FIG. 8 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to Modification 2 of the embodiment. 図９は、実施の形態の変形例３に係る第一部材及びその周辺の構成を示す断面斜視図である。FIG. 9 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to Modification 3 of the embodiment. 図１０は、実施の形態の変形例４に係る第一部材及びその周辺の構成を示す断面斜視図である。FIG. 10 is a cross-sectional perspective view showing the configuration of the first member and its surroundings according to Modification 4 of the embodiment. 図１１は、外装体の側壁部と蓄電素子ユニットとの間に配置された第一部材を備える蓄電装置の構成を示す断面図である。FIG. 11 is a sectional view showing the configuration of a power storage device including a first member disposed between a side wall of an exterior body and a power storage element unit.
　（１）本発明の一態様に係る蓄電装置は、１以上の蓄電素子を有する蓄電素子ユニットと、前記蓄電素子ユニットを収容する外装体とを備え、第一方向における前記外装体の壁部と前記蓄電素子ユニットとの間には、前記壁部及び前記蓄電素子ユニットの少なくとも一方に接続された第一部材が配置されており、前記蓄電素子ユニットはさらに、前記第一部材と前記第一方向で対向する部分を形成する第二部材を有し、前記第一部材は、前記第一方向の端部に設けられた溶融部を有する。 (1) A power storage device according to one aspect of the present invention includes a power storage element unit having one or more power storage elements, and an exterior body housing the power storage element unit, and a wall portion of the exterior body in a first direction A first member connected to at least one of the wall and the power storage element unit is arranged between the power storage element unit and the power storage element unit, and the power storage element unit is further connected to the first member and the first direction. The first member has a fusion portion provided at an end in the first direction.
　この構成によれば、外装体の壁部と蓄電素子ユニットとの間に配置された第一部材により、少なくとも、蓄電素子ユニットの当該壁部に近づく方向の移動が制限される。さらに、第一部材の端部には溶融部が設けられている。つまり、蓄電装置の組み立て時において、第一部材における、外装体の壁部または蓄電素子ユニットに対向する端部を一旦溶融させた後に、接続対象物（壁部または第二部材）に沿って冷え固まった部分である溶融部を形成できる。これにより、溶融部の位置または形状は、接続対象物（壁部または第二部材）の位置または形状に応じて形成される。従って、例えば蓄電素子ユニットまたは第一部材の公差を吸収しつつ、第一部材を、蓄電素子ユニットの移動を効果的に制限するように配置できる。これにより、外装体の内部における蓄電素子ユニットの位置の安定性を向上することができる。 According to this configuration, the first member disposed between the wall of the exterior body and the power storage element unit restricts at least the movement of the power storage element unit in the direction toward the wall. Furthermore, a melting section is provided at the end of the first member. In other words, when assembling a power storage device, the end of the first member facing the wall of the exterior body or the power storage element unit is once melted and then cooled along the connection target (wall or second member). A molten part, which is a solidified part, can be formed. Thereby, the position or shape of the fusion part is formed according to the position or shape of the connection target (wall part or second member). Therefore, for example, the first member can be arranged so as to effectively limit movement of the power storage element unit while absorbing tolerances of the power storage element unit or the first member. Thereby, the stability of the position of the power storage element unit inside the exterior body can be improved.
　（２）上記（１）に記載の蓄電装置において、前記第一部材と、前記壁部及び前記第二部材の少なくとも一方とは、前記溶融部において溶着されている、としてもよい。 (2) In the power storage device according to (1) above, the first member and at least one of the wall portion and the second member may be welded at the melting portion.
　この構成によれば、第一部材と、外装体の壁部及び蓄電素子ユニットの少なくとも一方とは溶着によって固定されている。従って、第一部材は、蓄電素子ユニットの、当該壁部に近づく方向（第一方向の一方側）への移動だけでなく第一方向に直交する方向の移動も制限できる。 According to this configuration, the first member and at least one of the wall portion of the exterior body and the power storage element unit are fixed by welding. Therefore, the first member can restrict not only the movement of the power storage element unit in the direction approaching the wall (one side in the first direction) but also the movement in the direction perpendicular to the first direction.
　（３）上記（１）または（２）に記載の蓄電装置において、前記１以上の蓄電素子は、前記第一方向と直交する第二方向に並んで配置された複数の蓄電素子であり、前記第二部材の少なくとも一部は、前記第一方向において前記複数の前記蓄電素子と前記壁部との間に位置し、かつ、前記第二方向において、前記複数の前記蓄電素子のうちの２以上の前記蓄電素子に亘って配置されている、としてもよい。 (3) In the power storage device according to (1) or (2) above, the one or more power storage elements are a plurality of power storage elements arranged in a second direction orthogonal to the first direction, and the At least a portion of the second member is located between the plurality of power storage elements and the wall in the first direction, and two or more of the plurality of power storage elements in the second direction The power storage element may be arranged over the power storage element.
　この構成によれば、蓄電素子ユニットが有するバスバーホルダのような２以上の蓄電素子に亘って配置される第二部材と、外装体の壁部との間に第一部材とが配置される。従って、１つの第一部材で２以上の蓄電素子の移動を制限することができる。これにより、蓄電素子ユニットが有する複数の蓄電素子それぞれの移動を、比較的に少ない数の第一部材で、効率よく制限できる。このことは、複数の蓄電素子を有する蓄電素子ユニットの位置の安定性を向上させるための構造の簡素化に有利である。 According to this configuration, the first member is arranged between the second member, which is arranged across two or more power storage elements such as a bus bar holder included in the power storage element unit, and the wall of the exterior body. Therefore, movement of two or more power storage elements can be restricted by one first member. Thereby, the movement of each of the plurality of power storage elements included in the power storage element unit can be efficiently restricted using a relatively small number of first members. This is advantageous in simplifying the structure for improving the stability of the position of a power storage element unit having a plurality of power storage elements.
　（４）上記（３）に記載の蓄電装置において、前記壁部と前記第二部材との間には、３以上の前記第一部材が配置されており、前記３以上の前記第一部材のそれぞれは、前記第一方向から見た場合に互いに重複しない位置に配置されている、としてもよい。 (4) In the power storage device according to (3) above, three or more of the first members are arranged between the wall and the second member, and the three or more of the first members are arranged between the wall and the second member. Each of them may be arranged at a position that does not overlap with each other when viewed from the first direction.
　この構成によれば、第一方向に直交する平面内で分散して配置される３以上の第一部材が、外装体の壁部と第二部材との間に配置される。これにより、２以上の蓄電素子の第一方向の位置が、外装体の空間内でバランスよく制限される。 According to this configuration, three or more first members distributed and arranged within a plane orthogonal to the first direction are arranged between the wall of the exterior body and the second member. Thereby, the positions of the two or more power storage elements in the first direction are restricted in a well-balanced manner within the space of the exterior body.
　（５）上記（１）～（４）のいずれかひとつに記載の蓄電装置において、前記外装体は、前記蓄電素子ユニットが挿入可能な大きさの開口部を有する外装体本体と、前記開口部を塞ぐ蓋体とを有し、前記壁部は前記蓋体の一部である、としてもよい。 (5) In the power storage device according to any one of (1) to (4) above, the exterior body includes an exterior body body having an opening large enough to allow insertion of the energy storage element unit, and the opening and a lid that closes the lid, and the wall portion may be a part of the lid.
　この構成によれば、例えば上方に開口する開口部を有する外装体本体に蓄電素子ユニットを収容した後に、蓄電素子ユニットの上から第一部材の配置作業を行うことができる。従って、例えば、溶融部の形成を伴う第一部材の配置作業を精度よく行うことができる。 According to this configuration, for example, after the power storage element unit is housed in the exterior body body having an opening that opens upward, the first member can be placed from above the power storage element unit. Therefore, for example, the work of arranging the first member that involves the formation of the melted portion can be performed with high precision.
　（６）本発明の一態様に係る蓄電装置は、１以上の蓄電素子を有する蓄電素子ユニットと、前記蓄電素子ユニットを収容する外装体とを備え、第一方向における前記外装体の壁部と前記蓄電素子ユニットとの間には、第一部材が配置されており、前記第一部材と前記壁部とは、前記第一部材の前記第一方向の端部に設けられた溶融部で接続されている、としてもよい。 (6) A power storage device according to one aspect of the present invention includes a power storage element unit having one or more power storage elements, and an exterior body housing the power storage element unit, and a wall portion of the exterior body in a first direction A first member is disposed between the power storage element unit and the first member and the wall portion are connected by a fused portion provided at an end of the first member in the first direction. It may be said that it has been done.
　この構成によれば、外装体の壁部と蓄電素子ユニットとの間に配置された第一部材により、少なくとも、蓄電素子ユニットの当該壁部に近づく方向への移動が制限される。さらに、外装体の壁部と第一部材とは溶融部によって接続されている。つまり、蓄電装置の組み立て時において、第一部材における、外装体の壁部に対向する端部を一旦溶融させた後に壁部に沿って冷え固まった部分である溶融部が形成される。これにより、溶融部の位置または形状は、当該壁部の位置または形状に応じて形成される。従って、例えば蓄電素子ユニットまたは／及び第一部材の公差を吸収しつつ、第一部材を、蓄電素子ユニットの移動を効果的に制限するように配置できる。これにより、外装体の内部における蓄電素子ユニットの位置の安定性を向上することができる。 According to this configuration, the first member disposed between the wall of the exterior body and the power storage element unit restricts at least the movement of the power storage element unit in the direction toward the wall. Furthermore, the wall portion of the exterior body and the first member are connected by a fused portion. That is, when assembling the power storage device, a melted portion is formed, which is a portion that cools and hardens along the wall after the end of the first member facing the wall of the exterior body is once melted. Thereby, the position or shape of the fusion zone is formed according to the position or shape of the wall. Therefore, for example, the first member can be arranged so as to effectively restrict movement of the power storage element unit while absorbing tolerances of the power storage element unit and/or the first member. Thereby, the stability of the position of the power storage element unit inside the exterior body can be improved.
　以下、図面を参照しながら、本発明の実施の形態（その変形例も含む）に係る蓄電装置について説明する。なお、以下で説明する実施の形態は、いずれも包括的または具体的な例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態、製造工程、製造工程の順序などは、一例であり、本発明を限定する主旨ではない。また、各図において、寸法等は厳密に図示したものではない。さらに、各図において、同一または同様な構成要素については同じ符号を付している。 Hereinafter, a power storage device according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. Note that the embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing steps, order of manufacturing steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention. Further, in each figure, dimensions etc. are not strictly illustrated. Furthermore, in each figure, the same or similar components are designated by the same reference numerals.
　以下の説明及び図面中において、蓄電装置の外装体の長手方向、または、１つの蓄電素子の短側面の対向方向を、Ｘ軸方向と定義する。蓄電装置の外装体の短手方向、または、複数の蓄電素子の並び方向を、Ｙ軸方向と定義する。蓄電装置の外装体における外装体本体と蓋体との並び方向、または、上下方向を、Ｚ軸方向と定義する。これらＸ軸方向、Ｙ軸方向及びＺ軸方向は、互いに交差（本実施の形態では直交）する方向である。なお、使用態様によってはＺ軸方向が上下方向にならない場合も考えられるが、以下では説明の便宜のため、Ｚ軸方向を上下方向として説明する。 In the following description and drawings, the longitudinal direction of the exterior body of the power storage device or the direction in which the short sides of one power storage element face each other is defined as the X-axis direction. The lateral direction of the exterior body of the power storage device or the direction in which a plurality of power storage elements are arranged is defined as the Y-axis direction. The direction in which the exterior body and the lid are lined up or the vertical direction in the exterior body of the power storage device is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (orthogonal in this embodiment). Note that depending on the mode of use, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below.
　以下の説明において、例えば、Ｘ軸プラス方向とは、Ｘ軸の矢印方向を示し、Ｘ軸マイナス方向とは、Ｘ軸プラス方向とは反対方向を示す。Ｙ軸方向及びＺ軸方向についても同様である。単に「Ｘ軸方向」という場合は、Ｘ軸に平行な双方向またはいずれか一方の方向を意味する。Ｙ軸及びＺ軸に関する用語についても同様である。 In the following description, for example, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the opposite direction to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction. When simply referred to as "X-axis direction", it means both directions or either direction parallel to the X-axis. The same applies to the terms related to the Y axis and the Z axis.
　さらに、平行及び直交などの、相対的な方向または姿勢を示す表現は、厳密には、その方向または姿勢ではない場合も含む。例えば、２つの方向が直交している、とは、当該２つの方向が完全に直交していることを意味するだけでなく、実質的に直交していること、すなわち、例えば数％程度の差異を含むことも意味する。以下の説明において、「絶縁」と表現する場合、「電気的な絶縁」を意味する。 Furthermore, expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where the directions or orientations are not strictly speaking. For example, when two directions are orthogonal, it does not only mean that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, there is a difference of only a few percent, for example. It also means to include. In the following description, when the expression "insulation" is used, it means "electrical insulation".
　（実施の形態）
　［１．蓄電装置の全般的な説明］
　まず、図１～図３を用いて、実施の形態に係る蓄電装置１の全般的な説明を行う。図１は、実施の形態に係る蓄電装置１の外観を示す斜視図である。図２は、実施の形態に係る蓄電装置１の分解斜視図である。図２では、外装体１０の蓋体１２０を、外装体本体１１０から分離して、蓄電素子ユニット１５を露出させた状態が図示されている。図３は、実施の形態に係る蓄電素子ユニット１５の分解斜視図である。 (Embodiment)
[1. General explanation of power storage device]
First, a general description of a power storage device 1 according to an embodiment will be given using FIGS. 1 to 3. FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment. FIG. 2 is an exploded perspective view of power storage device 1 according to the embodiment. FIG. 2 shows a state in which the lid 120 of the exterior body 10 is separated from the exterior body 110 and the power storage element unit 15 is exposed. FIG. 3 is an exploded perspective view of the power storage element unit 15 according to the embodiment.
　蓄電装置１は、外部からの電気を充電し、また外部へ電気を放電することができる装置であり、本実施の形態では、略直方体形状を有している。なお、ここでいう直方体とは、すべての面が長方形または正方形で構成された六面体である。蓄電装置１は、例えば、電力貯蔵用途または電源用途等に使用される電池モジュール（組電池）である。具体的には、蓄電装置１は、例えば、自動車、自動二輪車、ウォータークラフト、船舶、スノーモービル、農業機械、建設機械、または、電気鉄道用の鉄道車両等の移動体の駆動用またはエンジン始動用等のバッテリ等として用いられる。上記の自動車としては、電気自動車（ＥＶ）、ハイブリッド電気自動車（ＨＥＶ）、プラグインハイブリッド電気自動車（ＰＨＥＶ）及び化石燃料（ガソリン、軽油、液化天然ガス等）自動車が例示される。上記の電気鉄道用の鉄道車両としては、電車、モノレール、リニアモーターカー、並びに、ディーゼル機関及び電気モーターの両方を備えるハイブリッド電車が例示される。蓄電装置１は、家庭用または事業用等に使用される定置用のバッテリ等としても用いることができる。 The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment. Note that the rectangular parallelepiped here is a hexahedron in which all sides are rectangular or square. The power storage device 1 is, for example, a battery module (battery assembly) used for power storage, power supply, or the like. Specifically, the power storage device 1 is used for driving or starting an engine of a moving object such as a car, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. It is used as a battery etc. Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles. Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor. The power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.
　図１～図３に示すように、本実施の形態に係る蓄電装置１は、１以上の蓄電素子２０を有する蓄電素子ユニット１５と、蓄電素子ユニット１５を収容する外装体１０とを備える。蓄電装置１は、上記の構成要素の他、蓄電素子２０の充電状態及び放電状態等を監視または制御する回路基板、リレー及びコネクタ等の電気機器、並びに、電気機器と蓄電素子２０とを電気的に接続する電線等を備え得るが、これらの図示及び説明は省略する。 As shown in FIGS. 1 to 3, power storage device 1 according to the present embodiment includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses power storage element unit 15. In addition to the above-mentioned components, the power storage device 1 includes electrical equipment such as a circuit board, a relay, and a connector that monitors or controls the charging state and discharging state of the power storage element 20, and an electrical connection between the electrical equipment and the power storage element 20. Although it may be provided with electric wires etc. connected to, illustration and explanation of these are omitted.
　外装体１０は、蓄電装置１の外殻を構成する略直方体形状（箱状）の容器（モジュールケース）である。つまり、外装体１０は、蓄電素子ユニット１５を衝撃などから保護する部材である。外装体１０は、例えば、ポリカーボネート（ＰＣ）、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリスチレン（ＰＳ）、ポリフェニレンサルファイド樹脂（ＰＰＳ）、ポリフェニレンエーテル（ＰＰＥ（変性ＰＰＥを含む））、ポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル（ＰＦＡ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエーテルサルフォン（ＰＥＳ）、ポリアミド（ＰＡ）、ＡＢＳ樹脂、若しくは、それらの複合材料等の絶縁部材等により形成されている。外装体１０を形成する材料は上記樹脂には限定されず、鉄またはアルミニウム合金などの金属が、外装体１０を形成する材料として採用され得る。 The exterior body 10 is a substantially rectangular parallelepiped-shaped (box-shaped) container (module case) that constitutes the outer shell of the power storage device 1 . In other words, the exterior body 10 is a member that protects the power storage element unit 15 from impacts and the like. The exterior body 10 is made of, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET), etc. ), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), polyamide (PA), It is formed of an insulating member such as ABS resin or a composite material thereof. The material forming the exterior body 10 is not limited to the above resin, and metals such as iron or aluminum alloy may be employed as the material forming the exterior body 10.
　外装体１０は、蓄電素子ユニット１５を収容する外装体本体１１０と、外装体本体１１０の開口部１１１を塞ぐ蓋体１２０とを有する。外装体本体１１０は、蓄電素子ユニット１５が挿入可能な大きさの開口部１１１（図２参照）が形成された有底矩形筒状のハウジングである。具体的には、外装体本体１１０は、Ｙ軸方向で対向する一対の側壁部１１２と、Ｘ軸方向で対向する一対の側壁部１１３と、図２で表されていない底壁部とを有する。 The exterior body 10 has an exterior body body 110 that accommodates the power storage element unit 15, and a lid body 120 that closes the opening 111 of the exterior body body 110. The exterior body 110 is a bottomed rectangular cylindrical housing in which an opening 111 (see FIG. 2) is formed with a size into which the power storage element unit 15 can be inserted. Specifically, the exterior main body 110 has a pair of side walls 112 facing each other in the Y-axis direction, a pair of side walls 113 facing each other in the X-axis direction, and a bottom wall part not shown in FIG. 2. .
　蓋体１２０は、外装体本体１１０の開口部１１１を閉塞する矩形状の部材であり、本実施の形態では有底矩形筒状の形状を有している。具体的には、蓋体１２０は、Ｙ軸方向で対向する一対の側壁部１２２と、Ｘ軸方向で対向する一対の側壁部１２３と、外装体１０の天壁部を形成する壁部１２５とを有する。蓋体１２０には、図１及び図２に示すように、正極の外部端子９１及び負極の外部端子９２が配置されている。外部端子９１及び９２は、蓄電素子ユニット１５が有する１以上の蓄電素子２０と電気的に接続されている。蓄電装置１は、これら外部端子９１及び９２を介して、外部からの電気を充電し、また外部へ電気を放電する。外部端子９１及び９２は、例えば、アルミニウム、アルミニウム合金等の金属製の導電部材で形成されている。 The lid 120 is a rectangular member that closes the opening 111 of the exterior main body 110, and in this embodiment has a rectangular cylindrical shape with a bottom. Specifically, the lid 120 includes a pair of side walls 122 facing each other in the Y-axis direction, a pair of side walls 123 facing each other in the X-axis direction, and a wall 125 forming the top wall of the exterior body 10. has. As shown in FIGS. 1 and 2, the lid body 120 is provided with a positive external terminal 91 and a negative external terminal 92. External terminals 91 and 92 are electrically connected to one or more power storage elements 20 included in power storage element unit 15 . Power storage device 1 charges electricity from the outside via these external terminals 91 and 92, and discharges electricity to the outside. The external terminals 91 and 92 are made of, for example, a conductive member made of metal such as aluminum or aluminum alloy.
　蓄電素子ユニット１５は、１以上の蓄電素子２０を有する。本実施の形態では、蓄電素子ユニット１５には４個の蓄電素子２０が含まれている。より具体的には、蓄電素子ユニット１５は、蓄電素子列２５と、バスバーホルダ５１と、複数のバスバー６０とを有する。蓄電素子列２５は、Ｙ軸方向に並べられた４個の蓄電素子２０と、Ｙ軸方向の両端部のそれぞれに配置されたスペーサ７０とを含む。Ｙ軸方向は第二方向の一例である。一対のスペーサ７０は、例えば「エンドスペーサ」または「エンドホルダ」と呼ばれる部材である。スペーサ７０は、スペーサ７０に隣り合う蓄電素子２０を保護または／及び保持する部材である。バスバーホルダ５１は、第二部材５０の一例であり、本実施の形態では、樹脂等の絶縁材料で形成された絶縁部材である。バスバーホルダ５１は、バスバー６０が配置されることで当該バスバー６０の位置を決めるバスバー用開口部５９（図３参照）を複数有している。 The power storage element unit 15 has one or more power storage elements 20. In this embodiment, power storage element unit 15 includes four power storage elements 20. More specifically, the power storage element unit 15 includes a power storage element row 25, a busbar holder 51, and a plurality of busbars 60. The power storage element row 25 includes four power storage elements 20 arranged in the Y-axis direction, and spacers 70 arranged at each end in the Y-axis direction. The Y-axis direction is an example of the second direction. The pair of spacers 70 are, for example, members called "end spacers" or "end holders." Spacer 70 is a member that protects and/or holds power storage element 20 adjacent to spacer 70 . Bus bar holder 51 is an example of second member 50, and in this embodiment is an insulating member made of an insulating material such as resin. The busbar holder 51 has a plurality of busbar openings 59 (see FIG. 3) that determine the position of the busbar 60 by placing the busbar 60 therein.
　スペーサ７０及びバスバーホルダ５１を形成する材料としては、外装体１０の材料として採用され得るＰＰ、ＰＣ、またはＰＥ等の樹脂が例示される。スペーサ７０及びバスバーホルダ５１のそれぞれは、金属製の基材の表面に絶縁処理（樹脂コーティング等）が施されることで形成されてもよい。 Examples of the material for forming the spacer 70 and the bus bar holder 51 include resins such as PP, PC, or PE that can be used as the material for the exterior body 10. Each of the spacer 70 and the bus bar holder 51 may be formed by applying insulation treatment (resin coating, etc.) to the surface of a metal base material.
　蓄電素子ユニット１５は、上記構成要素の他、隣り合う２つの蓄電素子２０の間に配置されるセル間スペーサまたはセル間ホルダ、蓄電素子２０に沿って配置される絶縁フィルム、及び、蓄電素子列２５をＹ軸方向で拘束する拘束部材等を備え得るが、これらの図示及び説明は省略する。 In addition to the above-mentioned components, the power storage element unit 15 includes an inter-cell spacer or an inter-cell holder arranged between two adjacent power storage elements 20, an insulating film arranged along the power storage elements 20, and a power storage element row. 25 in the Y-axis direction, but illustrations and explanations of these are omitted.
　蓄電素子２０は、電気を充電し、また、電気を放電することのできる二次電池（単電池）であり、より具体的には、リチウムイオン二次電池などの非水電解質二次電池である。蓄電素子２０は、扁平な直方体形状（角形）の形状を有しており、本実施の形態では、上述のように、４個の蓄電素子２０がＹ軸方向に配列されている。 The power storage element 20 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, it is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage elements 20 have a flat rectangular parallelepiped (prismatic) shape, and in this embodiment, four power storage elements 20 are arranged in the Y-axis direction as described above.
　蓄電素子２０は、非水電解質二次電池には限定されず、非水電解質二次電池以外の二次電池であってもよいし、キャパシタであってもよい。蓄電素子２０は、二次電池ではなく、使用者が充電をしなくても蓄えられている電気を使用できる一次電池であってもよい。蓄電素子２０は、固体電解質を用いた電池であってもよい。蓄電素子２０は、パウチタイプの蓄電素子であってもよい。蓄電素子２０の形状は、上記角形には限定されず、それ以外の多角柱形状、円柱形状、楕円柱形状、長円柱形状等であってもよい。 The power storage element 20 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor. The power storage element 20 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it. Power storage element 20 may be a battery using a solid electrolyte. The power storage element 20 may be a pouch type power storage element. The shape of the power storage element 20 is not limited to the above-mentioned rectangular shape, and may be other shapes such as a polygonal columnar shape, a cylindrical shape, an elliptical columnar shape, an elongated columnar shape, etc.
　本実施の形態では、蓄電素子２０は、金属製の容器２１を備える。容器２１は、互いに対向する一対の長側面２１ａと、互いに対向する一対の短側面２１ｂと、底面２１ｄとを有する角形のケースである。容器２１の内部には、電極体、集電体、及び電解液等が収容されている。本実施の形態では、複数の蓄電素子２０のそれぞれは、長側面２１ａがＹ軸方向に向く姿勢（短側面２１ｂがＹ軸方向に平行な姿勢）で、Ｙ軸方向に一列に並べられている。 In this embodiment, the power storage element 20 includes a metal container 21. The container 21 is a rectangular case having a pair of long sides 21a facing each other, a pair of short sides 21b facing each other, and a bottom face 21d. Inside the container 21, an electrode body, a current collector, an electrolytic solution, etc. are housed. In this embodiment, each of the plurality of power storage elements 20 is arranged in a line in the Y-axis direction with the long side surface 21a facing the Y-axis direction (the short side surface 21b being parallel to the Y-axis direction). .
　容器２１の蓋板２１ｃには、容器２１の内部の電極体と電気的に接続された金属製の電極端子２２（正極端子及び負極端子）が設けられている。電極端子２２は、容器２１の蓋板２１ｃから、上方（Ｚ軸プラス方向）に向けて突出して配置されている。容器２１の蓋板２１ｃにはさらに、容器２１の内圧が過度に上昇した場合に内部のガスを外部に排出するためのガス排出弁２３が設けられている。 The lid plate 21c of the container 21 is provided with metal electrode terminals 22 (a positive electrode terminal and a negative electrode terminal) that are electrically connected to an electrode body inside the container 21. The electrode terminal 22 is arranged to protrude upward (in the Z-axis positive direction) from the lid plate 21c of the container 21. The lid plate 21c of the container 21 is further provided with a gas discharge valve 23 for discharging the internal gas to the outside when the internal pressure of the container 21 increases excessively.
　バスバー６０は、バスバーホルダ５１に保持された状態で、少なくとも１つの蓄電素子２０上に配置され、当該少なくとも１つの蓄電素子２０の電極端子２２に接続される板状部材である。バスバー６０は、例えば、銅、銅合金、アルミニウム、アルミニウム合金等の金属製の導電部材で形成されている。図２及び図３に示されるように、本実施の形態では、３つのバスバー６０を用いて、蓄電素子２０が直列に接続されている。直列に接続された４つの蓄電素子２０からなる蓄電素子２０群の正極（総プラス端子）には、バスバー６０ｂが接合されている。蓄電素子２０群の総プラス端子は、バスバー６０ｂを介して外部端子９１と電気的に接続されている。蓄電素子２０群の正極の負極（総マイナス端子）には、バスバー６０ａが接合されている。蓄電素子２０群の総マイナス端子は、バスバー６０ａを介して外部端子９２と電気的に接続されている。 The bus bar 60 is a plate-shaped member that is placed on at least one power storage element 20 while being held by the bus bar holder 51 and connected to the electrode terminal 22 of the at least one power storage element 20 . The bus bar 60 is made of a conductive member made of metal, such as copper, copper alloy, aluminum, or aluminum alloy. As shown in FIGS. 2 and 3, in this embodiment, three bus bars 60 are used to connect power storage elements 20 in series. A bus bar 60b is connected to the positive electrode (total positive terminal) of a group of 20 power storage elements 20 that are made up of four power storage elements 20 connected in series. All positive terminals of the 20 groups of power storage elements are electrically connected to an external terminal 91 via a bus bar 60b. A bus bar 60a is connected to the positive and negative electrodes (total negative terminals) of the 20 groups of power storage elements. All negative terminals of the 20 groups of power storage elements are electrically connected to an external terminal 92 via a bus bar 60a.
　このような基本構成を有する蓄電装置１において、外装体１０の内部には、蓄電素子ユニット１５と外装体１０の壁部との間に配置された、図１～図３に表されていない第一部材が備えられている。蓄電装置１では、この第一部材によって蓄電素子ユニット１５の移動を制限する構造が採用されている。以下、図４～図６を参照しながら、本実施の形態に係る第一部材及びその周辺の構成について説明する。 In the power storage device 1 having such a basic configuration, inside the exterior body 10 there is a power storage device not shown in FIGS. Some materials are provided. The power storage device 1 employs a structure in which movement of the power storage element unit 15 is restricted by this first member. The configuration of the first member and its surroundings according to the present embodiment will be described below with reference to FIGS. 4 to 6.
　［２．第一部材及びその周辺の構成について］
　図４は、実施の形態に係る第一部材８０及びその周辺の構成を示す断面斜視図である。図４では、図３のＩＶ－ＩＶ線を通るＹＺ平面における蓄電装置１の一部の断面が斜視図で表されている。図５は、実施の形態に係る外装体１０の蓋体１２０の底面図である。図５では、説明の便宜上、第一部材８０のＺ軸マイナス方向の端部であって、溶融される前の端部に、溶融部を示す符号“８５”が付されている。図６は、実施の形態に係る第二部材５０の一例であるバスバーホルダ５１の上面図である。図６では、バスバーホルダ５１における、第一部材８０に対向する部分である対向部５５の範囲が斜線を付した領域で表されており、バスバーホルダ５１によって隠されている蓄電素子２０のおおよその外形が破線で表されている。 [2. Regarding the configuration of the first member and its surroundings]
FIG. 4 is a cross-sectional perspective view showing the configuration of the first member 80 and its surroundings according to the embodiment. In FIG. 4, a cross section of a portion of power storage device 1 taken along the YZ plane passing through line IV-IV in FIG. 3 is shown in a perspective view. FIG. 5 is a bottom view of the lid 120 of the exterior body 10 according to the embodiment. In FIG. 5, for convenience of explanation, the end of the first member 80 in the negative Z-axis direction, before being melted, is labeled with a symbol "85" indicating a melted portion. FIG. 6 is a top view of the bus bar holder 51, which is an example of the second member 50 according to the embodiment. In FIG. 6 , the range of the facing portion 55 that is the portion facing the first member 80 in the bus bar holder 51 is represented by a hatched area, and the approximate area of the power storage element 20 hidden by the bus bar holder 51 is shown. The outline is represented by a broken line.
　図４に示すように、蓄電装置１は、外装体１０の壁部１２５と、蓄電素子ユニット１５との間に配置された第一部材８０を備えている。本実施の形態では、第一部材８０は壁部１２５を有する蓋体１２０と一体の構造物として蓄電装置１に備えられている。具体的には、第一部材８０は、蓋体１２０の側壁部１２２及び壁部１２５に接続されており、図４では、第一部材８０と、側壁部１２２及び壁部１２５との境界が破線で表されている。 As shown in FIG. 4, power storage device 1 includes a first member 80 disposed between wall portion 125 of exterior body 10 and power storage element unit 15. In the present embodiment, first member 80 is provided in power storage device 1 as a structure integrated with lid 120 having wall portion 125. Specifically, the first member 80 is connected to the side wall 122 and wall 125 of the lid 120, and in FIG. 4, the boundary between the first member 80 and the side wall 122 and wall 125 is indicated by a broken line. It is expressed as.
　第一部材８０は、Ｚ軸方向の端部に設けられた溶融部８５を有している。Ｚ軸方向は第一方向の一例である。第一方向は、外装体１０の壁部１２５と蓄電素子ユニット１５との並び方向である。すなわち、第一部材８０は、第一方向において外装体１０の壁部１２５と蓄電素子ユニット１５との間に配置されている。従って、第一方向は、外装体１０の壁部１２５と第一部材１８０との並び方向であり、第一部材１８０と蓄電素子ユニット１５との並び方向でもある。 The first member 80 has a melting part 85 provided at the end in the Z-axis direction. The Z-axis direction is an example of the first direction. The first direction is the direction in which the wall portion 125 of the exterior body 10 and the power storage element unit 15 are lined up. That is, the first member 80 is arranged between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction. Therefore, the first direction is the direction in which the wall portion 125 of the exterior body 10 and the first member 180 are lined up, and also the direction in which the first member 180 and the power storage element unit 15 are lined up.
　本実施の形態では、第一部材８０は、第二部材５０であるバスバーホルダ５１に対向する端部、すなわち、Ｚ軸マイナス方向の端部に溶融部８５が設けられている。溶融部８５は、蓄電装置１の組み立て時において溶融され、その後に冷え固まった部分である。そのため、図４に示すように、溶融部８５は、バスバーホルダ５１の対向部５５の位置において、対向部５５に沿った形状に形成される。対向部５５は、バスバーホルダ５１により形成された部分であり、第一部材８０とＺ軸方向で対向する部分である。 In the present embodiment, the first member 80 is provided with a melting portion 85 at the end facing the bus bar holder 51, which is the second member 50, that is, at the end in the negative Z-axis direction. Melted portion 85 is a portion that is melted during assembly of power storage device 1 and then cooled and solidified. Therefore, as shown in FIG. 4, the melted portion 85 is formed in a shape along the opposing portion 55 at the position of the opposing portion 55 of the bus bar holder 51. The opposing portion 55 is a portion formed by the bus bar holder 51, and is a portion facing the first member 80 in the Z-axis direction.
　なお、第一部材８０が蓋体１２０と一体であることは必須ではなく、外装体１０とは別体の部材が第一部材８０として配置されてもよい。さらに、第一部材８０における溶融部８５の位置は、バスバーホルダ５１に対向する端部であることは必須ではなく、第一部材８０における、外装体１０の壁部１２５に対向する端部に溶融部８５が設けられてもよい。これらの構成例については、実施の形態の変形例１～４として後述する。 Note that it is not essential that the first member 80 be integrated with the lid body 120, and a member separate from the exterior body 10 may be arranged as the first member 80. Furthermore, the position of the melting portion 85 in the first member 80 is not necessarily at the end facing the bus bar holder 51, but rather at the end of the first member 80 facing the wall 125 of the exterior body 10. A section 85 may also be provided. These configuration examples will be described later as Modifications 1 to 4 of the embodiment.
　このように、本実施の形態に係る蓄電装置１は、１以上の蓄電素子２０を有する蓄電素子ユニット１５と、蓄電素子ユニット１５を収容する外装体１０とを備える。第一方向（Ｚ軸方向）における外装体１０の壁部１２５と蓄電素子ユニット１５との間には、壁部１２５及び蓄電素子ユニット１５の少なくとも一方に接続された第一部材８０が配置されている。蓄電素子ユニット１５はさらに、第一部材８０とＺ軸方向で対向する部分である対向部５５を形成する第二部材５０（本実施の形態ではバスバーホルダ５１）を有する。第一部材８０は、Ｚ軸方向の端部に設けられた溶融部８５を有する。 As described above, the power storage device 1 according to the present embodiment includes the power storage element unit 15 having one or more power storage elements 20 and the exterior body 10 that houses the power storage element unit 15. A first member 80 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction). There is. The power storage element unit 15 further includes a second member 50 (bus bar holder 51 in this embodiment) that forms a facing portion 55 that faces the first member 80 in the Z-axis direction. The first member 80 has a melting part 85 provided at an end in the Z-axis direction.
　この構成によれば、外装体１０の壁部１２５と蓄電素子ユニット１５との間に配置された第一部材８０により、少なくとも、蓄電素子ユニット１５の当該壁部１２５に近づく方向（Ｚ軸プラス方向）への移動が制限される。さらに、第一部材８０の端部には溶融部８５が設けられている。つまり、蓄電装置１の組み立て時において、第一部材８０の端部を一旦溶融させた後に、接続対象物（壁部１２５またはバスバーホルダ５１）に沿って冷え固まった部分である溶融部８５を形成できる。これにより、溶融部８５の位置または形状は、接続対象物（壁部１２５またはバスバーホルダ５１）の位置または形状に応じて形成される。従って、例えば蓄電素子ユニット１５または／及び第一部材８０の公差を吸収しつつ、第一部材８０を、蓄電素子ユニット１５の移動を効果的に制限するように、蓄電素子ユニット１５に対して配置できる。すなわち、第一部材８０による蓄電素子ユニット１５を押さえる力が不十分となり難く、かつ、過大にもなり難い。このように、本実施の形態に係る蓄電装置１によれば、外装体１０の内部における蓄電素子ユニット１５の位置の安定性が向上される。 According to this configuration, the first member 80 disposed between the wall 125 of the exterior body 10 and the power storage element unit 15 moves the power storage element unit 15 at least in the direction approaching the wall 125 of the power storage element unit 15 (Z-axis positive direction). ) movement is restricted. Furthermore, a melting section 85 is provided at the end of the first member 80. That is, when assembling the power storage device 1, after the end of the first member 80 is once melted, the melted part 85, which is a cooled and solidified part, is formed along the connection target (wall part 125 or bus bar holder 51). can. Thereby, the position or shape of the melted part 85 is formed according to the position or shape of the connection target (wall part 125 or bus bar holder 51). Therefore, for example, the first member 80 is arranged with respect to the power storage element unit 15 so as to effectively limit the movement of the power storage element unit 15 while absorbing the tolerance of the power storage element unit 15 and/or the first member 80. can. That is, the force with which the first member 80 presses the power storage element unit 15 is unlikely to be insufficient or excessive. In this way, according to the power storage device 1 according to the present embodiment, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
　より具体的には、本実施の形態では、第一部材８０は、外装体１０の壁部１２５と接続されており、第一部材８０の、バスバーホルダ５１に対向する端部に溶融部８５が設けられている。その結果、溶融部８５は、バスバーホルダ５１の対向部５５の位置において、対向部５５に沿った形状に形成されている。より詳細には、第一部材８０は、蓋体１２０の互いに交差する方向に広がる２つの壁部（図２では壁部１２５及び側壁部１２２）に接続されている。そのため、第一部材８０の溶融された端部をバスバーホルダ５１に押し当てる際に、第一部材８０がＺ軸方向に平行な姿勢を維持しやすい。つまり、押し当てる際の外力による第一部材８０の変形（撓みまたは歪みなど）が生じ難い。その結果、第一部材８０の溶融部８５を精度よく形成できる。 More specifically, in this embodiment, the first member 80 is connected to the wall portion 125 of the exterior body 10, and the fused portion 85 is formed at the end of the first member 80 facing the bus bar holder 51. It is provided. As a result, the melted portion 85 is formed in a shape along the opposing portion 55 at the position of the opposing portion 55 of the bus bar holder 51 . More specifically, the first member 80 is connected to two walls (the wall 125 and the side wall 122 in FIG. 2) of the lid 120 that extend in directions that intersect with each other. Therefore, when pressing the melted end of the first member 80 against the bus bar holder 51, the first member 80 can easily maintain a posture parallel to the Z-axis direction. In other words, the first member 80 is unlikely to be deformed (bending or distorting) due to external force during pressing. As a result, the fused portion 85 of the first member 80 can be formed with high precision.
　本実施の形態では、第一部材８０とバスバーホルダ５１とは、溶融部８５において溶着されている。 In this embodiment, the first member 80 and the bus bar holder 51 are welded together at the welded portion 85.
　つまり、第一部材８０は、溶着によって蓄電素子ユニット１５に固定されている。従って、第一部材８０は、蓄電素子ユニット１５の、壁部１２５に近づく方向（Ｚ軸プラス方向）への移動だけでなくＺ軸方向に直交する方向の移動も制限できる。従って、外装体１０の内部における蓄電素子ユニット１５の位置の安定性がさらに向上する。 In other words, the first member 80 is fixed to the power storage element unit 15 by welding. Therefore, the first member 80 can restrict not only the movement of the power storage element unit 15 in the direction approaching the wall portion 125 (the positive Z-axis direction) but also the movement in the direction orthogonal to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
　第一部材８０とバスバーホルダ５１との溶着の手法に特に限定はない。当該溶着に採用される手法としては、熱溶着、超音波溶着、及びレーザ溶着が例示される。熱溶着では、第一部材８０の端部を外部からの熱で溶融させて冷え固まらせることで、当該端部とバスバーホルダ５１とを溶着する溶融部８５が形成される。熱溶着としては、例えばヒートシールを採用してもよい。ヒートシールとは、接着剤を使用せず熱によって部材間を溶着する手法である。超音波溶着では、第一部材８０の端部を超音波振動による摩擦熱によって溶融させて冷え固まらせることで、当該端部とバスバーホルダ５１とを溶着する溶融部８５が形成される。レーザ溶着では、第一部材８０の端部を、レーザ光の照射によって溶融させて冷え固まらせることで、当該端部とバスバーホルダ５１とを溶着する溶融部８５が形成される。第一部材８０とバスバーホルダ５１との溶着の手法としては、化学的な手法も採用され得る。例えば、第一部材８０の端部を、ジクロロメタンなどの溶剤を用いて溶融させた後に固化させることで、当該端部とバスバーホルダ５１とを溶着する溶融部８５が形成される。 There is no particular limitation on the method of welding the first member 80 and the bus bar holder 51. Examples of methods employed for the welding include thermal welding, ultrasonic welding, and laser welding. In thermal welding, the end portion of the first member 80 is melted by external heat, cooled and solidified, thereby forming a fused portion 85 that welds the end portion and the bus bar holder 51 together. As the thermal welding, for example, heat sealing may be employed. Heat sealing is a method of welding parts together using heat without using adhesives. In ultrasonic welding, the end of the first member 80 is melted by frictional heat generated by ultrasonic vibration, and then cooled and solidified to form a fused portion 85 that welds the end and the bus bar holder 51 together. In laser welding, the end of the first member 80 is melted by irradiation with a laser beam, and then cooled and solidified to form a fused portion 85 that welds the end to the bus bar holder 51 . A chemical method may also be adopted as a method for welding the first member 80 and the bus bar holder 51. For example, by melting the end of the first member 80 using a solvent such as dichloromethane and then solidifying it, the melted portion 85 that welds the end and the bus bar holder 51 is formed.
　上記のような各種の手法のいずれかで溶融部８５が形成される場合、第二部材５０（バスバーホルダ５１）の対向部５５の少なくとも一部も溶融する場合がある。すなわち、第一部材８０と、バスバーホルダ５１の対向部５５とは、溶融部８５において互いに溶け合わされる場合がある。この場合、溶融部８５は、バスバーホルダ５１の一部分であって溶融部８５の形成の際の熱で溶融した一部分を含み得る。溶融部８５がバスバーホルダ５１の一部分を含むことは、溶融部８５における第一部材８０とバスバーホルダ５１との接合強度の向上の観点から有利である。しかしながら、溶融部８５がバスバーホルダ５１の一部分を含むことは必須ではない。例えば、バスバーホルダ５１の融点が第一部材８０の融点よりも高いことに起因し、溶融部８５がバスバーホルダ５１の一部分を含まない場合を想定する。この場合、例えば、バスバーホルダ５１の対向部５５の表面の凹凸に沿って溶融部８５が形成されることで、溶融部８５がバスバーホルダ５１に接合された状態になり得る。対向部５５の表面が凹凸のない平面である場合であっても、溶融部８５は、Ｚ軸方向における当該平面の位置において当該平面に沿った形状に形成される。そのため、第一部材８０は、少なくとも、バスバーホルダ５１のＺ軸プラス方向への移動を制限できる。これら溶融部８５に関する補足事項は、バスバーホルダ５１における少なくとも対向部５５の部分が金属で形成されている場合にも適用される。 When the melted portion 85 is formed by any of the various methods described above, at least a portion of the facing portion 55 of the second member 50 (busbar holder 51) may also be melted. That is, the first member 80 and the facing portion 55 of the bus bar holder 51 may be melted together at the melting portion 85 . In this case, the melted portion 85 may include a portion of the bus bar holder 51 that is melted by the heat generated during the formation of the melted portion 85 . It is advantageous that the fused portion 85 includes a portion of the bus bar holder 51 from the viewpoint of improving the bonding strength between the first member 80 and the bus bar holder 51 in the fused portion 85. However, it is not essential that the fused portion 85 include a portion of the busbar holder 51. For example, assume that the melting point of the busbar holder 51 is higher than the melting point of the first member 80, so that the melted portion 85 does not include a portion of the busbar holder 51. In this case, for example, the fused portion 85 may be formed along the unevenness of the surface of the facing portion 55 of the bus bar holder 51, so that the fused portion 85 may be joined to the bus bar holder 51. Even if the surface of the opposing portion 55 is a flat surface without irregularities, the melted portion 85 is formed in a shape along the plane at the position of the plane in the Z-axis direction. Therefore, the first member 80 can restrict at least the movement of the bus bar holder 51 in the Z-axis plus direction. These supplementary notes regarding the fused portion 85 also apply to the case where at least the opposing portion 55 of the bus bar holder 51 is formed of metal.
　溶融部８５が、バスバーホルダ５１と接触していることは必須ではない。例えば、溶融部８５が冷え固まる際に収縮すること等に起因して、バスバーホルダ５１と溶融部８５との間に隙間が形成される可能性がある。この場合であっても、第一部材８０の溶融部８５が設けられた端部は、バスバーホルダ５１に近接し、かつ、Ｚ軸方向で対向した位置にあるため、少なくとも、蓄電素子ユニット１５のＺ軸プラス方向への移動を制限できる。ただし、蓄電素子ユニット１５の位置の安定性をさらに向上させる、という観点からは、溶融部８５がバスバーホルダ５１に接触した状態であることが好ましく、溶融部８５がバスバーホルダ５１に溶着していることがさらに好ましい。 It is not essential that the melting part 85 be in contact with the busbar holder 51. For example, a gap may be formed between the bus bar holder 51 and the melted portion 85 due to contraction of the melted portion 85 as it cools and hardens. Even in this case, the end portion of the first member 80 where the melting portion 85 is provided is located close to the bus bar holder 51 and facing the bus bar holder 51 in the Z-axis direction. Movement in the Z-axis plus direction can be restricted. However, from the viewpoint of further improving the stability of the position of the power storage element unit 15, it is preferable that the fused portion 85 is in contact with the bus bar holder 51, and the fused portion 85 is welded to the bus bar holder 51. It is even more preferable.
　本実施の形態において、蓄電装置１が備える蓄電素子ユニット１５は、図３に示されるように、複数の蓄電素子２０を有している。すなわち、蓄電装置１が備える１以上の蓄電素子２０は、Ｚ軸方向と直交するＹ軸方向に並んで配置された複数の蓄電素子２０である。バスバーホルダ５１の少なくとも一部は、Ｚ軸方向において複数の蓄電素子２０と壁部１２５との間に位置し、かつ、Ｙ軸方向において、複数の蓄電素子２０のうちの２以上の蓄電素子２０に亘って配置されている。 In this embodiment, the power storage element unit 15 included in the power storage device 1 includes a plurality of power storage elements 20, as shown in FIG. That is, the one or more power storage elements 20 included in the power storage device 1 are a plurality of power storage elements 20 arranged in line in the Y-axis direction orthogonal to the Z-axis direction. At least a portion of the bus bar holder 51 is located between the plurality of power storage elements 20 and the wall portion 125 in the Z-axis direction, and is located between two or more of the power storage elements 20 among the plurality of power storage elements 20 in the Y-axis direction. It is located throughout.
　このように、本実施の形態では、蓄電素子ユニット１５が有するバスバーホルダ５１は、２以上の蓄電素子２０に亘って配置されており、かつ、バスバーホルダ５１と外装体１０の壁部１２５との間に第一部材８０が配置される。従って、１つの第一部材８０で２以上の蓄電素子２０の移動を制限することができる。これにより、蓄電素子ユニット１５が有する複数の蓄電素子２０それぞれの移動を、比較的に少ない数の第一部材８０で、効率よく制限できる。このことは、複数の蓄電素子２０を有する蓄電素子ユニット１５の位置の安定性を向上させるための構造の簡素化に有利である。 As described above, in the present embodiment, the bus bar holder 51 of the power storage element unit 15 is arranged across two or more power storage elements 20, and the bus bar holder 51 and the wall portion 125 of the exterior body 10 are connected to each other. A first member 80 is arranged in between. Therefore, movement of two or more power storage elements 20 can be restricted by one first member 80. Thereby, the movement of each of the plurality of power storage elements 20 included in the power storage element unit 15 can be efficiently restricted by a relatively small number of first members 80. This is advantageous in simplifying the structure for improving the stability of the position of the power storage element unit 15 having the plurality of power storage elements 20.
　より具体的には、本実施の形態に係る蓄電装置１では、壁部１２５とバスバーホルダ５１との間には、図５に示されるように、３以上の第一部材８０が配置されている。３以上の第一部材８０のそれぞれは、Ｚ軸方向から見た場合に互いに重複しない位置に配置されている。 More specifically, in the power storage device 1 according to the present embodiment, three or more first members 80 are arranged between the wall portion 125 and the bus bar holder 51, as shown in FIG. . Each of the three or more first members 80 is arranged at a position that does not overlap with each other when viewed from the Z-axis direction.
　この構成によれば、Ｚ軸方向に直交する平面内で分散して配置される３以上の第一部材８０が、外装体１０の壁部１２５とバスバーホルダ５１との間に配置される。これにより、２以上の蓄電素子２０のＺ軸方向の位置が、外装体１０の空間内でバランスよく制限される。例えば２以上の蓄電素子２０のＺ軸方向のサイズの公差により、バスバーホルダ５１がＸＹ平面に対して傾いている場合であっても、３以上の第一部材８０のそれぞれの端部には溶融部８５が設けられているため、当該傾きを吸収するように３以上の第一部材８０を配置できる。具体的には、蓄電装置１が備える３以上の第一部材８０は、ＸＹ平面内で同一直線上に並ばない３つの第一部材８０を含んでいる。つまり、蓄電素子ユニット１５は、少なくとも、ＸＹ平面内で同一直線上に並ばない３か所においてＺ軸プラス方向への移動が制限される。これにより、外装体１０の内部における蓄電素子ユニット１５の姿勢の安定性がより確実に向上する。 According to this configuration, three or more first members 80 that are distributed and arranged within a plane perpendicular to the Z-axis direction are arranged between the wall portion 125 of the exterior body 10 and the bus bar holder 51. Thereby, the positions of the two or more power storage elements 20 in the Z-axis direction are restricted in a well-balanced manner within the space of the exterior body 10. For example, even when the bus bar holder 51 is inclined with respect to the Since the portion 85 is provided, three or more first members 80 can be arranged so as to absorb the inclination. Specifically, the three or more first members 80 included in the power storage device 1 include three first members 80 that are not aligned on the same straight line in the XY plane. That is, movement of the power storage element unit 15 in the Z-axis plus direction is restricted at least at three locations that are not aligned on the same straight line in the XY plane. Thereby, the stability of the posture of the power storage element unit 15 inside the exterior body 10 is improved more reliably.
　蓄電装置１が複数の第一部材８０を備える場合、少なくとも２つの第一部材８０は、Ｚ軸方向から見た場合に互いに重複する位置に配置されていてもよい。例えば、先細り形状の突起が第一部材として壁部１２５に設けられている場合、２つの第一部材それぞれの根元部分（壁部１２５に接続されている部分）の一部が重複していてもよい。この場合、Ｚ軸方向から見た場合、当該２つの第一部材は重複して見える。しかし、当該２つの第一部材それぞれの先端部分（蓄電素子ユニット１５に対向する端部）は分離している。従って、当該２つの第一部材それぞれの先端部分に溶融部を形成できる。つまり、当該２つの第一部材のそれぞれは、互いに独立して、蓄電素子ユニット１５の移動を制限できる。 When power storage device 1 includes a plurality of first members 80, at least two first members 80 may be arranged at positions that overlap with each other when viewed from the Z-axis direction. For example, if a tapered protrusion is provided on the wall 125 as the first member, even if a portion of the root portions (portions connected to the wall 125) of the two first members overlap, good. In this case, when viewed from the Z-axis direction, the two first members appear to overlap. However, the tip portions (the ends facing the power storage element unit 15) of the two first members are separated. Therefore, a fused portion can be formed at the tip portions of each of the two first members. That is, each of the two first members can restrict movement of the power storage element unit 15 independently of each other.
　より詳細には、本実施の形態では、図５に示すように、５つの第一部材８０である第一部材８０ａ～８０ｅが配置されており、第一部材８０ａ～８０ｅのそれぞれは、溶融部８５（８５ａ～８５ｅのいずれか）を有している。これら第一部材８０ａ～８０ｅは、蓋体１２０の側壁部１２２及び１２３の内面に沿うように分散して配置されている。第二部材５０であるバスバーホルダ５１には、第一部材８０ａ～８０ｅにＺ軸方向で対向する位置に、５つの対向部５５（対向部５５ａ～５５ｅ）が配置される。対向部５５ａ～５５ｅは、Ｚ軸方向から見た場合に略矩形状に形成されたバスバーホルダ５１の周縁部に沿って分散して配置されている。すなわち、バスバーホルダ５１は、その周縁部における分散した位置のそれぞれにおいて、第一部材８０によるＺ軸プラス方向への移動の制限を受ける。 More specifically, in this embodiment, as shown in FIG. 5, first members 80a to 80e, which are five first members 80, are arranged, and each of the first members 80a to 80e 85 (any one of 85a to 85e). These first members 80a to 80e are distributed along the inner surfaces of the side walls 122 and 123 of the lid 120. In the bus bar holder 51, which is the second member 50, five opposing parts 55 (opposing parts 55a to 55e) are arranged at positions facing the first members 80a to 80e in the Z-axis direction. The opposing portions 55a to 55e are distributed and arranged along the periphery of the bus bar holder 51, which is formed into a substantially rectangular shape when viewed from the Z-axis direction. That is, the bus bar holder 51 is restricted in its movement in the Z-axis plus direction by the first member 80 at each of the dispersed positions on its peripheral edge.
　これにより、バスバーホルダ５１のＸＹ平面に対する姿勢の安定性がさらに向上する。より好ましくは、溶融部８５ａ～８５ｅのそれぞれは、当該溶融部８５とＺ軸方向で対向する位置にある対向部５５（５５ａ～５５ｅのいずれか）に溶着している。これにより、バスバーホルダ５１は、５つの第一部材８０に固定された状態となり、その結果、バスバーホルダ５１の位置の安定性がさらに向上する。すなわち、バスバーホルダ５１を備える蓄電素子ユニット１５の、外装体１０の内部における位置の安定性がさらに向上する。 This further improves the stability of the posture of the bus bar holder 51 with respect to the XY plane. More preferably, each of the melted parts 85a to 85e is welded to the opposing part 55 (any one of 55a to 55e) located at a position facing the melted part 85 in the Z-axis direction. Thereby, the bus bar holder 51 is fixed to the five first members 80, and as a result, the stability of the position of the bus bar holder 51 is further improved. That is, the stability of the position of the power storage element unit 15 including the bus bar holder 51 inside the exterior body 10 is further improved.
　本実施の形態では、第一部材８０の配置位置は、蓋体１２０が有する壁部１２５と蓄電素子ユニット１５との間である。つまり、外装体１０は、蓄電素子ユニット１５が挿入可能な大きさの開口部１１１を有する外装体本体１１０と、開口部１１１を塞ぐ蓋体１２０とを有する。壁部１２５は蓋体１２０の一部である。 In the present embodiment, the first member 80 is arranged between the wall portion 125 of the lid 120 and the power storage element unit 15. That is, the exterior body 10 includes an exterior body body 110 having an opening 111 large enough to allow the power storage element unit 15 to be inserted therein, and a lid 120 that closes the opening 111 . The wall portion 125 is a part of the lid body 120.
　この構成によれば、上方に開口する開口部１１１を有する外装体本体１１０に蓄電素子ユニット１５を収容した後に、蓄電素子ユニット１５の上から開口部１１１を介して第一部材８０の配置作業を行うことができる。従って、溶融部８５の形成を伴う第一部材８０の配置作業を精度よく行うことができる。 According to this configuration, after the power storage element unit 15 is housed in the exterior body main body 110 having the opening 111 that opens upward, the first member 80 is placed from above the power storage element unit 15 through the opening 111. It can be carried out. Therefore, the work of arranging the first member 80 that involves the formation of the melted portion 85 can be performed with high precision.
　外装体本体１１０の開口部１１１に、Ｚ軸方向から見た場合に開口部１１１の内部に向けて突出する凸部であって、Ｚ軸方向から見た場合に一部が蓄電素子ユニット１５と重なる凸部が配置されていてもよい。このような凸部が開口部１１１に配置されている場合であっても、蓄電素子ユニット１５の開口部１１０への挿入時に、凸部が変形または移動することで、蓄電素子ユニット１５が開口部１１０を通過できればよい。当該凸部は、蓄電素子ユニット１５の移動を案内するガイド部であってもよい。つまり、開口部１１１に、見かけ上、蓄電素子ユニット１５の開口部１１１への挿入を阻害し得る凸部等が配置されていてもよい。この場合であっても、蓄電素子ユニット１５を、開口部１１１を介して外装体本体１１０の内部に収容できるのであれば、その開口部１１１は、「蓄電素子ユニット１５が挿入可能な大きさの開口部１１１」である。 The opening 111 of the exterior body main body 110 has a convex portion that protrudes toward the inside of the opening 111 when viewed from the Z-axis direction, and a portion of which is the power storage element unit 15 when viewed from the Z-axis direction. Overlapping convex portions may be arranged. Even if such a convex portion is disposed in the opening 111, the convex portion deforms or moves when the power storage element unit 15 is inserted into the opening 110, so that the power storage element unit 15 is disposed in the opening 110. It is sufficient if it can pass 110. The convex portion may be a guide portion that guides movement of the power storage element unit 15. That is, a convex portion or the like may be arranged in the opening 111 that may apparently obstruct insertion of the power storage element unit 15 into the opening 111 . Even in this case, if the power storage element unit 15 can be accommodated inside the exterior body 110 through the opening 111, the opening 111 should be of a size that allows the power storage element unit 15 to be inserted. opening 111''.
　本実施の形態では、第一部材８０は蓋体１２０に一体化されているため、蓋体１２０と外装体本体１１０との接合作業とともに、第一部材８０の、第二部材５０であるバスバーホルダ５１に対する配置作業を行うことができる。従って、蓋体１２０と外装体本体１１０とを溶着により接合する場合、蓋体１２０の一対の側壁部１２２及び一対の側壁部１２３（図２及び図４参照）の下端部の溶融と、１以上の第一部材８０の下端部の溶融とを、一連の作業工程で行うことができる。これにより、蓄電素子ユニット１５の位置の安定性が向上された蓄電装置１を効率よく製造できる。 In this embodiment, since the first member 80 is integrated with the lid body 120, the bus bar holder, which is the second member 50, of the first member 80 is 51 can be placed. Therefore, when joining the lid 120 and the exterior body 110 by welding, the lower ends of the pair of side walls 122 and the pair of side walls 123 (see FIGS. 2 and 4) of the lid 120 are melted, and one or more The melting of the lower end of the first member 80 can be performed in a series of work steps. Thereby, the power storage device 1 in which the stability of the position of the power storage element unit 15 is improved can be efficiently manufactured.
　以上、実施の形態に係る蓄電装置１について、第一部材８０及びその周辺の構成を中心に説明した。しかし、蓄電装置１における第一部材８０及びその周辺の構成は、図４～図６に示される構成とは異なっていてもよい。そこで、以下に、第一部材８０及びその周辺の構成についての変形例を、上記実施の形態との差分を中心に説明する。 The power storage device 1 according to the embodiment has been described above, focusing on the configuration of the first member 80 and its surroundings. However, the configuration of first member 80 and its surroundings in power storage device 1 may be different from the configuration shown in FIGS. 4 to 6. Therefore, a modified example of the configuration of the first member 80 and its surroundings will be described below, focusing on the differences from the above embodiment.
　［３－１．変形例１］
　図７は、実施の形態の変形例１に係る第一部材８０及びその周辺の構成を示す断面図である。図７における断面の位置は、図４における断面の位置に準ずる。このことは、後述する図８～図１１についても適用される。 [3-1. Modification example 1]
FIG. 7 is a sectional view showing the configuration of the first member 80 and its surroundings according to Modification 1 of the embodiment. The position of the cross section in FIG. 7 corresponds to the position of the cross section in FIG. 4. This also applies to FIGS. 8 to 11, which will be described later.
　本変形例に係る蓄電装置１ａは、１以上の蓄電素子２０を有する蓄電素子ユニット１５と、蓄電素子ユニット１５を収容する外装体１０とを備える。第一方向（Ｚ軸方向）における外装体１０の壁部１２５と蓄電素子ユニット１５との間には、壁部１２５及び蓄電素子ユニット１５の少なくとも一方に接続された第一部材８０が配置されている。蓄電素子ユニット１５はさらに、第一部材８０とＺ軸方向で対向する部分である対向部７５を形成する第二部材５０を有する。第一部材８０は、Ｚ軸方向の端部に設けられた溶融部８５を有する。これらの構成は、実施の形態に係る蓄電装置１と共通する。 A power storage device 1a according to this modification includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15. A first member 80 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction). There is. The power storage element unit 15 further includes a second member 50 that forms a facing portion 75 that faces the first member 80 in the Z-axis direction. The first member 80 has a melting part 85 provided at an end in the Z-axis direction. These configurations are common to power storage device 1 according to the embodiment.
　本変形例では、対向部７５を有する第二部材５０はスペーサ７０であり、この点で、本変形例に係る蓄電装置１ａは、実施の形態に係る蓄電装置１とは異なる。すなわち、本変形例において、蓄電素子ユニット１５はバスバーホルダ５１を有しなくてもよい。 In this modification, the second member 50 having the facing portion 75 is a spacer 70, and in this point, the power storage device 1a according to the present modification differs from the power storage device 1 according to the embodiment. That is, in this modification, the power storage element unit 15 does not need to have the bus bar holder 51.
　より具体的には、本変形例において、第一部材８０の溶融部８５は、スペーサ７０のＺ軸プラス方向の端部に対向する位置に設けられている。スペーサ７０は、第一部材８０とＺ軸方向で対向する対向部７５を有する。従って、溶融部８５の位置及び形状は、対向部７５の位置及び形状に応じて形成されている。これにより、第一部材８０は、直接的には、スペーサ７０の少なくともＺ軸プラス方向への移動を制限し、第一部材８０がスペーサ７０をＺ軸マイナス方向に押さえる力は不十分になり難く、かつ、過大にもなり難い。その結果、スペーサ７０を含む蓄電素子ユニット１５は、少なくともＺ軸プラス方向への移動が制限される。より具体的には、スペーサ７０は、スペーサ７０と隣り合う蓄電素子２０のＺ軸プラス方向に位置する上壁部７１を有している。そのため、スペーサ７０のＺ軸プラス方向への移動が制限されることで、少なくともスペーサ７０に隣り合う蓄電素子２０のＺ軸プラス方向への移動が制限される。このことは、蓄電素子ユニット１５の位置の安定性の向上に寄与する。このように、本変形例に係る蓄電装置１ａによれば、外装体１０の内部における蓄電素子ユニット１５の位置の安定性が向上される。 More specifically, in this modification, the melting portion 85 of the first member 80 is provided at a position facing the end of the spacer 70 in the Z-axis plus direction. The spacer 70 has a facing portion 75 that faces the first member 80 in the Z-axis direction. Therefore, the position and shape of the melting part 85 are formed according to the position and shape of the opposing part 75. As a result, the first member 80 directly restricts the movement of the spacer 70 at least in the Z-axis positive direction, and the force with which the first member 80 presses the spacer 70 in the Z-axis negative direction is unlikely to become insufficient. , and is unlikely to become excessive. As a result, the power storage element unit 15 including the spacer 70 is restricted from moving at least in the positive Z-axis direction. More specifically, spacer 70 has an upper wall portion 71 located in the positive Z-axis direction of power storage element 20 adjacent to spacer 70 . Therefore, by restricting the movement of the spacer 70 in the Z-axis plus direction, at least the movement of the power storage element 20 adjacent to the spacer 70 in the Z-axis plus direction is restricted. This contributes to improving the stability of the position of the power storage element unit 15. In this way, according to the power storage device 1a according to the present modification, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
　好ましくは、第一部材８０は、第一部材８０が有する溶融部８５においてスペーサ７０と溶着されている。これにより、第一部材８０は、蓄電素子ユニット１５の、Ｚ軸プラス方向への移動だけでなく、Ｚ軸方向に直交する方向の移動も制限できる。従って、外装体１０の内部における蓄電素子ユニット１５の位置の安定性がさらに向上する。 Preferably, the first member 80 is welded to the spacer 70 at a welded portion 85 that the first member 80 has. Thereby, the first member 80 can restrict not only the movement of the power storage element unit 15 in the positive Z-axis direction but also the movement in the direction perpendicular to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
　［３－２．変形例２］
　図８は、実施の形態の変形例２に係る第一部材１８０及びその周辺の構成を示す断面図である。本変形例に係る蓄電装置１ｂは、１以上の蓄電素子２０を有する蓄電素子ユニット１５と、蓄電素子ユニット１５を収容する外装体１０とを備える。第一方向（Ｚ軸方向）における外装体１０の壁部１２５と蓄電素子ユニット１５との間には、壁部１２５及び蓄電素子ユニット１５の少なくとも一方に接続された第一部材１８０が配置されている。蓄電素子ユニット１５はさらに、第一部材１８０とＺ軸方向で対向する部分である対向部５５ｂを形成する第二部材５０を有する。本変形例に係る第二部材５０はバスバーホルダ５１である。第一部材１８０は、Ｚ軸方向の端部に設けられた溶融部１８５を有する。これらの構成は、実施の形態に係る蓄電装置１と共通する。なお、本変形例において、バスバーホルダ５１における第一部材１８０と対向する部分である対向部５５ｂは、第一部材１８０とバスバーホルダ５１との仮想的な境界面（図８では破線で表示）として規定される。 [3-2. Modification 2]
FIG. 8 is a sectional view showing the configuration of a first member 180 and its surroundings according to a second modification of the embodiment. A power storage device 1b according to this modification includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15. A first member 180 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction). There is. The power storage element unit 15 further includes a second member 50 that forms a facing portion 55b that faces the first member 180 in the Z-axis direction. The second member 50 according to this modification is a bus bar holder 51. The first member 180 has a melting part 185 provided at an end in the Z-axis direction. These configurations are common to power storage device 1 according to the embodiment. In this modification, the opposing portion 55b, which is the portion of the busbar holder 51 that faces the first member 180, serves as a virtual boundary surface (indicated by a broken line in FIG. 8) between the first member 180 and the busbar holder 51. stipulated.
　本変形例では、第一部材１８０は、第二部材５０であるバスバーホルダ５１に一体に設けられている。つまり、第一部材１８０はバスバーホルダ５１から連続して設けられており、かつ、溶融部１８５は壁部１２５に対向する位置にある。これらの点で、本変形例に係る蓄電装置１ｂは、実施の形態に係る蓄電装置１とは異なる。 In this modification, the first member 180 is integrally provided with the bus bar holder 51, which is the second member 50. That is, the first member 180 is provided continuously from the bus bar holder 51, and the melting portion 185 is located at a position facing the wall portion 125. In these points, power storage device 1b according to this modification differs from power storage device 1 according to the embodiment.
　すなわち、本変形例に係る蓄電装置１ｂは、１以上の蓄電素子２０を有する蓄電素子ユニット１５と、蓄電素子ユニット１５を収容する外装体１０とを備える。第一方向（Ｚ軸方向）における外装体１０の壁部１２５と蓄電素子ユニット１５との間には、第一部材１８０が配置されている。第一部材１８０と壁部１２５とは、第一部材１８０のＺ軸方向の端部に設けられた溶融部１８５で接続されている。第一部材１８０のＺ軸方向の端部とは、第一部材１８０のＺ軸方向の一方側の先端から、第一部材１８０のＺ軸方向の全長の１／３の範囲である。 That is, the power storage device 1b according to this modification includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15. A first member 180 is arranged between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction). The first member 180 and the wall portion 125 are connected by a fusion portion 185 provided at an end of the first member 180 in the Z-axis direction. The end of the first member 180 in the Z-axis direction is a range from the tip of the first member 180 on one side in the Z-axis direction to ⅓ of the total length of the first member 180 in the Z-axis direction.
　このように、本変形例では、バスバーホルダ５１に予め接続されている第一部材１８０の、壁部１２５に対向する端部に溶融部１８５が設けられている。従って、溶融部１８５の位置及び形状は、壁部１２５の位置及び形状に応じて形成されている。これにより、第一部材１８０がバスバーホルダ５１をＺ軸マイナス方向に押さえる力は不十分になり難く、かつ、過大にもなり難い。その結果、第一部材１８０を備える蓄電装置１ｂによれば、外装体１０の内部における蓄電素子ユニット１５の位置の安定性が向上される。 As described above, in this modification, the melting part 185 is provided at the end of the first member 180 that is connected to the bus bar holder 51 in advance, and which faces the wall part 125. Therefore, the position and shape of the melting part 185 are formed according to the position and shape of the wall part 125. Thereby, the force with which the first member 180 presses the bus bar holder 51 in the negative direction of the Z-axis is unlikely to be insufficient or excessive. As a result, according to the power storage device 1b including the first member 180, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
　好ましくは、第一部材１８０と外装体１０の壁部１２５とは、第一部材１８０が有する溶融部１８５において溶着されている。これにより、第一部材１８０は、蓄電素子ユニット１５の、Ｚ軸プラス方向への移動だけでなく、Ｚ軸方向に直交する方向の移動も制限できる。従って、外装体１０の内部における蓄電素子ユニット１５の位置の安定性がさらに向上する。 Preferably, the first member 180 and the wall portion 125 of the exterior body 10 are welded together at a welded portion 185 that the first member 180 has. Thereby, the first member 180 can restrict not only the movement of the power storage element unit 15 in the positive Z-axis direction but also the movement in the direction perpendicular to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
　［３－３．変形例３］
　図９は、実施の形態の変形例３に係る第一部材２８０及びその周辺の構成を示す断面図である。本変形例に係る蓄電装置１ｃは、１以上の蓄電素子２０を有する蓄電素子ユニット１５と、蓄電素子ユニット１５を収容する外装体１０とを備える。第一方向（Ｚ軸方向）における外装体１０の壁部１２５と蓄電素子ユニット１５との間には、壁部１２５及び蓄電素子ユニット１５の少なくとも一方に接続された第一部材２８０が配置されている。蓄電素子ユニット１５はさらに、第一部材２８０とＺ軸方向で対向する部分である対向部５５を形成する第二部材５０を有する。本変形例に係る第二部材５０はバスバーホルダ５１である。第一部材２８０は、Ｚ軸方向の端部に設けられた溶融部を有する。これらの構成は、実施の形態に係る蓄電装置１と共通する。 [3-3. Modification 3]
FIG. 9 is a sectional view showing the configuration of a first member 280 and its surroundings according to a third modification of the embodiment. A power storage device 1c according to this modification includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15. A first member 280 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction). There is. The power storage element unit 15 further includes a second member 50 that forms a facing portion 55 that faces the first member 280 in the Z-axis direction. The second member 50 according to this modification is a bus bar holder 51. The first member 280 has a melting part provided at an end in the Z-axis direction. These configurations are common to power storage device 1 according to the embodiment.
　本変形例では、第一部材２８０は、Ｚ軸方向の両端部に溶融部を有しており、この点で、本変形例に係る蓄電装置１ｃは、実施の形態に係る蓄電装置１とは異なる。具体的には、本変形例において、第一部材２８０は、第二部材５０であるバスバーホルダ５１、及び、外装体１０の壁部１２５のそれぞれとは別体の部材である。第一部材２８０を形成する材料としては、外装体１０の材料として採用され得るＰＰ、ＰＣ、またはＰＥ等の樹脂が例示される。第一部材２８０は、Ｚ軸マイナス方向の端部、つまり、バスバーホルダ５１と対向する端部に溶融部２８５ａを有する。第一部材２８０は、Ｚ軸プラス方向の端部、つまり、壁部１２５と対向する端部に溶融部２８５ｂを有する。従って、溶融部２８５ａは、バスバーホルダ５１の対向部５５に応じた位置及び形状に形成されている。さらに、溶融部２８５ｂは、壁部１２５の位置及び形状に応じた位置及び形状に形成されている。これにより、第一部材２８０がバスバーホルダ５１をＺ軸マイナス方向に押さえる力は不十分になり難く、かつ、過大にもなり難い。その結果、第一部材２８０を備える蓄電装置１ｃによれば、外装体１０の内部における蓄電素子ユニット１５の位置の安定性が向上される。 In this modification, the first member 280 has melted parts at both ends in the Z-axis direction, and in this point, the power storage device 1c according to the present modification is different from the power storage device 1 according to the embodiment. different. Specifically, in this modification, the first member 280 is a member separate from the bus bar holder 51, which is the second member 50, and the wall portion 125 of the exterior body 10. Examples of the material forming the first member 280 include resins such as PP, PC, and PE that can be used as the material for the exterior body 10. The first member 280 has a melted portion 285a at the end in the negative Z-axis direction, that is, at the end facing the bus bar holder 51. The first member 280 has a melted portion 285b at the end in the positive Z-axis direction, that is, at the end facing the wall 125. Therefore, the melted portion 285a is formed in a position and shape corresponding to the facing portion 55 of the bus bar holder 51. Further, the melting portion 285b is formed in a position and shape corresponding to the position and shape of the wall portion 125. Thereby, the force with which the first member 280 presses the bus bar holder 51 in the negative direction of the Z-axis is unlikely to be insufficient or excessive. As a result, according to the power storage device 1c including the first member 280, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
　好ましくは、第一部材２８０と蓄電素子ユニット１５のバスバーホルダ５１とは、第一部材２８０が有する溶融部２８５ａにおいて溶着されている。さらに、第一部材２８０と外装体１０の壁部１２５とは、第一部材２８０が有する溶融部２８５ｂにおいて、溶着されている。これにより、第一部材２８０は、蓄電素子ユニット１５の、Ｚ軸プラス方向への移動だけでなく、Ｚ軸方向に直交する方向の移動も制限できる。従って、外装体１０の内部における蓄電素子ユニット１５の位置の安定性がさらに向上する。 Preferably, the first member 280 and the bus bar holder 51 of the power storage element unit 15 are welded together at a welded portion 285a that the first member 280 has. Furthermore, the first member 280 and the wall portion 125 of the exterior body 10 are welded together at a welded portion 285b that the first member 280 has. Thereby, the first member 280 can restrict not only the movement of the power storage element unit 15 in the positive Z-axis direction but also the movement in the direction perpendicular to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
　［３－４．変形例４］
　図１０は、実施の形態の変形例４に係る第一部材３８０及びその周辺の構成を示す断面図である。本変形例に係る蓄電装置１ｄは、１以上の蓄電素子２０を有する蓄電素子ユニット１５と、蓄電素子ユニット１５を収容する外装体１０とを備える。第一方向（Ｚ軸方向）における外装体１０の壁部１２５と蓄電素子ユニット１５との間には、壁部１２５及び蓄電素子ユニット１５の少なくとも一方に接続された第一部材３８０が配置されている。蓄電素子ユニット１５はさらに、第一部材３８０とＺ軸方向で対向する部分である対向部５５ｄを形成する第二部材５０を有する。本変形例に係る第二部材５０はバスバーホルダ５１である。第一部材３８０は、Ｚ軸方向の端部に設けられた溶融部３８５を有する。これらの構成は、実施の形態に係る蓄電装置１と共通する。 [3-4. Modification example 4]
FIG. 10 is a sectional view showing the configuration of a first member 380 and its surroundings according to a fourth modification of the embodiment. A power storage device 1d according to this modification includes a power storage element unit 15 having one or more power storage elements 20, and an exterior body 10 that houses the power storage element unit 15. A first member 380 connected to at least one of the wall portion 125 and the power storage element unit 15 is disposed between the wall portion 125 of the exterior body 10 and the power storage element unit 15 in the first direction (Z-axis direction). There is. The power storage element unit 15 further includes a second member 50 that forms a facing portion 55d that faces the first member 380 in the Z-axis direction. The second member 50 according to this modification is a bus bar holder 51. The first member 380 has a melting part 385 provided at an end in the Z-axis direction. These configurations are common to power storage device 1 according to the embodiment.
　本変形例では、第二部材５０であるバスバーホルダ５１は、Ｚ軸プラス方向に突出する突出部４８０を有しており、突出部４８０のＺ軸プラス方向の端部（先端部）によって対向部５５ｄが形成されている。この点で、本変形例に係る蓄電装置１ｄは、実施の形態に係る蓄電装置１とは異なる。より具体的には、本変形例では、第一部材３８０は、外装体１０の壁部１２５に一体に設けられており、かつ、第二部材５０であるバスバーホルダ５１に一体に設けられた突出部４８０とＺ軸方向で対向する位置に溶融部３８５が設けられている。従って、溶融部３８５は、バスバーホルダ５１の対向部５５ｄに応じた位置及び形状に形成されている。これにより、第一部材３８０がバスバーホルダ５１をＺ軸マイナス方向に押さえる力は、不十分になり難く、かつ、過大にもなり難い。その結果、第一部材３８０を備える蓄電装置１ｄによれば、外装体１０の内部における蓄電素子ユニット１５の位置の安定性が向上される。 In this modification, the bus bar holder 51, which is the second member 50, has a protrusion 480 that protrudes in the Z-axis plus direction, and the end (tip) of the protrusion 480 in the Z-axis plus direction allows the bus bar holder 51 to be connected to the opposing part. 55d is formed. In this point, power storage device 1d according to the present modification differs from power storage device 1 according to the embodiment. More specifically, in this modification, the first member 380 is provided integrally with the wall portion 125 of the exterior body 10, and the first member 380 is a protrusion provided integrally with the bus bar holder 51, which is the second member 50. A melting portion 385 is provided at a position facing the portion 480 in the Z-axis direction. Therefore, the melting portion 385 is formed in a position and shape corresponding to the facing portion 55d of the bus bar holder 51. Thereby, the force with which the first member 380 presses the bus bar holder 51 in the negative direction of the Z-axis is unlikely to be insufficient or excessive. As a result, according to the power storage device 1d including the first member 380, the stability of the position of the power storage element unit 15 inside the exterior body 10 is improved.
　好ましくは、第一部材３８０とバスバーホルダ５１の突出部４８０とは、第一部材３８０が有する溶融部３８５において溶着されている。これにより、第一部材３８０は、蓄電素子ユニット１５の、Ｚ軸プラス方向への移動だけでなく、Ｚ軸方向に直交する方向の移動も制限できる。従って、外装体１０の内部における蓄電素子ユニット１５の位置の安定性がさらに向上する。 Preferably, the first member 380 and the protruding portion 480 of the bus bar holder 51 are welded together at a welded portion 385 that the first member 380 has. Thereby, the first member 380 can restrict not only the movement of the power storage element unit 15 in the positive Z-axis direction but also the movement in the direction perpendicular to the Z-axis direction. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10 is further improved.
　図１０に示す第一部材３８０は、外装体１０の壁部１２５と一体でなくてもよい。例えば壁部１２５とは別体の部材が、溶着または接着等によって壁部１２５に接続されることで、壁部１２５と蓄電素子ユニット１５との間に第一部材３８０が配置されてもよい。第一部材３８０が壁部１２５と一体であるか別体であるかに関わらず、突出部４８０は、第二部材５０であるバスバーホルダ５１と一体でなくてもよい。例えばバスバーホルダ５１とは別体の部材が、壁部１２５に溶着または接着等によって接続されてもよい。この場合であっても、当該部材によって、バスバーホルダ５１が有する突出部４８０であって、第一部材３８０と溶融部３８５において接続された突出部４８０を実現できる。 The first member 380 shown in FIG. 10 does not have to be integrated with the wall portion 125 of the exterior body 10. For example, the first member 380 may be arranged between the wall 125 and the power storage element unit 15 by connecting a member separate from the wall 125 to the wall 125 by welding, adhesion, or the like. Regardless of whether the first member 380 is integrated with the wall portion 125 or separate, the protruding portion 480 does not need to be integrated with the bus bar holder 51, which is the second member 50. For example, a member separate from the bus bar holder 51 may be connected to the wall portion 125 by welding, adhesive, or the like. Even in this case, the protrusion 480 of the bus bar holder 51 that is connected to the first member 380 at the melting part 385 can be realized by the member.
　図１０に示される蓄電装置１ｄの構成において、突出部４８０が、外装体１０の壁部１２５と蓄電素子ユニット１５との間に配置された第一部材４８０ｄである、ということもできる。すなわち、第一部材４８０ｄはバスバーホルダ５１に一体に設けられており、かつ、外装体１０の壁部１２５は、Ｚ軸マイナス方向に突出する突出部３８０ｄを有する、と説明できる。この構成において、第一部材４８０ｄは、外装体１０の壁部１２５の一部である突出部３８０ｄとＺ軸方向で対向する位置に、溶融部４８５を有している。従って、溶融部４８５は、突出部３８０ｄのＺ軸マイナス方向の端部に応じた位置及び形状に形成されている。これにより、第一部材４８０ｄがバスバーホルダ５１をＺ軸マイナス方向に押さえる力は不十分になり難く、かつ、過大にもなり難い。その結果、外装体１０の内部における蓄電素子ユニット１５の位置の安定性が向上される。 In the configuration of power storage device 1d shown in FIG. 10, it can also be said that protrusion 480 is first member 480d disposed between wall 125 of exterior body 10 and power storage element unit 15. That is, it can be explained that the first member 480d is provided integrally with the bus bar holder 51, and the wall portion 125 of the exterior body 10 has a protrusion portion 380d that protrudes in the negative direction of the Z-axis. In this configuration, the first member 480d has a fused portion 485 at a position facing the protruding portion 380d, which is a part of the wall portion 125 of the exterior body 10, in the Z-axis direction. Therefore, the melted portion 485 is formed in a position and shape corresponding to the end of the protruding portion 380d in the Z-axis minus direction. Thereby, the force with which the first member 480d presses the bus bar holder 51 in the negative direction of the Z-axis is unlikely to be insufficient or excessive. As a result, the stability of the position of power storage element unit 15 inside exterior body 10 is improved.
　突出部４８０及び第一部材３８０それぞれのＺ軸方向の長さの比に特に限定はない。突出部４８０及び第一部材３８０の一方が他方よりも長くてもよい。突出部４８０及び第一部材３８０それぞれのＹ軸方向またはＸ軸方向の幅についても、これら幅の比に特に限定はない。突出部４８０及び第一部材３８０の一方の幅が他方の幅より広くてもよい。例えば、Ｙ軸方向において、突出部４８０の幅が第一部材３８０の幅よりも大きい場合、突出部４８０と第一部材３８０との位置がずれていたとしても、熱溶着（例えばヒートシール）時にその位置のずれを許容することができるため、突出部４８０と第一部材３８０との接合がより容易となる。これらの突出部４８０及び第一部材３８０のサイズに関する補足事項は、突出部４８０が「第一部材４８０ｄ」であり、かつ、第一部材３８０が「突出部３８０ｄ」である場合についても適宜適用される。 There is no particular limitation on the ratio of the lengths of the protruding portion 480 and the first member 380 in the Z-axis direction. One of the protrusion 480 and the first member 380 may be longer than the other. Regarding the widths of the protruding portion 480 and the first member 380 in the Y-axis direction or the X-axis direction, there is no particular limitation on the ratio of these widths. One of the protrusion 480 and the first member 380 may have a wider width than the other. For example, if the width of the protrusion 480 is larger than the width of the first member 380 in the Y-axis direction, even if the protrusion 480 and the first member 380 are misaligned, during thermal welding (for example, heat sealing) Since the positional deviation can be tolerated, the protrusion 480 and the first member 380 can be joined more easily. These supplementary matters regarding the sizes of the protruding portion 480 and the first member 380 are also applied appropriately when the protruding portion 480 is the “first member 480d” and the first member 380 is the “protruding portion 380d”. Ru.
　［４．変形例］
　以上、本発明の実施の形態及びその変形例に係る蓄電装置について説明したが、本発明は、これら実施の形態及び変形例に限定されるものではない。つまり、今回開示された実施の形態は、全ての点で例示であって制限的なものではなく、本発明の範囲には、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれる。 [4. Modified example]
Although the power storage devices according to the embodiments of the present invention and their modifications have been described above, the present invention is not limited to these embodiments and modifications. In other words, the embodiments disclosed this time are illustrative in all respects and are not restrictive, and the scope of the present invention includes all changes within the meaning and scope equivalent to the scope of the claims. included.
　実施の形態１に係る蓄電装置１は、図５に示すように５つの第一部材８０を備えるとした。しかし、蓄電装置１は、少なくとも１つの第一部材８０を備えればよい。つまり、１つの第一部材８０が、第二部材５０と壁部１２５との間に配置され、かつ、第一部材８０のＺ軸方向の両端部の内の少なくとも一方の端部に溶融部８５が設けられていればよい。これにより、蓄電素子ユニット１５の、少なくともＺ軸プラス方向への移動は、当該１つの第一部材８０によって制限される。さらに、当該１つの第一部材８０が溶融部８５を有することで、第二部材５０をＺ軸マイナス方向に押さえる力は、不十分になり難く、かつ、過大にもなり難い。 The power storage device 1 according to the first embodiment includes five first members 80 as shown in FIG. 5 . However, power storage device 1 only needs to include at least one first member 80 . That is, one first member 80 is disposed between the second member 50 and the wall portion 125, and the fused portion 85 is provided at at least one of both ends of the first member 80 in the Z-axis direction. It is sufficient if it is provided. As a result, movement of the power storage element unit 15 at least in the Z-axis plus direction is restricted by the one first member 80 . Furthermore, since the one first member 80 has the melted portion 85, the force that presses the second member 50 in the negative Z-axis direction is unlikely to be insufficient or excessive.
　第一部材８０の、Ｚ軸マイナス方向から見た場合の形状は、図５に示す形状である必要はない。例えば、第一部材８０の、溶融部８５を形成する部分（Ｚ軸マイナス方向の端部）の形状は、三角形等の矩形以外の多角形であってもよく、楕円形または長円形等であってもよい。 The shape of the first member 80 when viewed from the negative Z-axis direction does not need to be the shape shown in FIG. 5. For example, the shape of the portion of the first member 80 that forms the melted portion 85 (the end in the negative Z-axis direction) may be a polygon other than a rectangle such as a triangle, or may be an ellipse or an ellipse. You can.
　図５における、第一部材８０ａ，８０ｂ、８０ｄ、及び８０ｅの、Ｘ軸方向の幅及びＹ軸方向の幅は、図５に示される幅である必要はない。例えば、一対の側壁部１２２の少なくとも一方の内側に、蓄電素子列２５（図２、３参照）のＸ軸方向の幅とほぼ等しい幅の第一部材８０が配置されてもよい。一対の側壁部１２３の少なくとも一方の内側に、蓄電素子列２５（図２、３参照）のＹ軸方向の幅とほぼ等しい幅の第一部材８０が配置されてもよい。このように、Ｚ軸方向と直交する方向に長尺状の第一部材８０を壁部１２５と第二部材５０との間に配置した場合、第一部材８０の長手方向の一部のみが第二部材５０に接続されること、または、第一部材８０が第二部材５０を押さえる力が、当該長手方向の一部に集中することが考えられる。しかしながら、上記実施の形態に係る第一部材８０では、第二部材５０に対向する端部に溶融部８５が設けられている。従って、第一部材８０は、長手方向の全域において第二部材５０と接続しやすく、かつ、第二部材５０を押さえる力の当該長手方向の一部への集中が生じ難い。 The widths of the first members 80a, 80b, 80d, and 80e in the X-axis direction and the Y-axis direction in FIG. 5 do not need to be the widths shown in FIG. For example, the first member 80 having a width approximately equal to the width in the X-axis direction of the power storage element row 25 (see FIGS. 2 and 3) may be arranged inside at least one of the pair of side wall portions 122. A first member 80 having a width approximately equal to the width of the power storage element row 25 (see FIGS. 2 and 3) in the Y-axis direction may be arranged inside at least one of the pair of side wall portions 123. In this way, when the elongated first member 80 is disposed between the wall portion 125 and the second member 50 in the direction orthogonal to the Z-axis direction, only a part of the first member 80 in the longitudinal direction is disposed in the direction perpendicular to the Z-axis direction. It is conceivable that the first member 80 is connected to the second member 50, or that the force with which the first member 80 presses the second member 50 is concentrated in a portion in the longitudinal direction. However, in the first member 80 according to the embodiment described above, the melting portion 85 is provided at the end facing the second member 50. Therefore, the first member 80 can be easily connected to the second member 50 over the entire length in the longitudinal direction, and the force for pressing the second member 50 is unlikely to be concentrated on a part in the longitudinal direction.
　第一部材８０を挟んで蓄電素子ユニット１５とは反対側の壁部１２５は、蓋体１２０の一部である必要はない。例えば、図１１に示すように、蓄電素子ユニット１５のＹ軸プラス方向に位置する側壁部１１２（図４参照）が、第一部材８０を挟んで蓄電素子ユニット１５とは反対側の「壁部」であってもよく、かつ、第二部材５０はスペーサ７０であってもよい。図１１は、外装体１０の側壁部１１２と蓄電素子ユニット１５との間に配置された第一部材５８０を備える蓄電装置１ｅの構成を示す断面図である。蓄電装置１ｅは以下のように説明される。 The wall portion 125 on the opposite side of the power storage element unit 15 with the first member 80 in between does not need to be a part of the lid body 120. For example, as shown in FIG. 11, a side wall portion 112 (see FIG. 4) located in the Y-axis positive direction of the power storage element unit 15 is a "wall portion" on the opposite side of the power storage element unit 15 with the first member 80 in between. ”, and the second member 50 may be the spacer 70. FIG. 11 is a cross-sectional view showing the configuration of a power storage device 1e including a first member 580 disposed between the side wall portion 112 of the exterior body 10 and the power storage element unit 15. Power storage device 1e will be explained as follows.
　蓄電装置１において、Ｙ軸方向における外装体１０ｅの壁部（側壁部１１２）と蓄電素子ユニット１５との間には、側壁部１１２及び蓄電素子ユニット１５の少なくとも一方に接続された第一部材５８０が配置されている。蓄電素子ユニット１５はさらに、第一部材５８０とＺ軸方向で対向する部分である対向部５５ｅを形成する第二部材５０（スペーサ７０）を有する。第一部材５８０は、Ｚ軸方向の端部に設けられた溶融部５８５を有する。図１１に示す蓄電装置１ｅにおいて、Ｙ軸方向は第一方向の一例である。 In the power storage device 1, a first member 580 connected to at least one of the side wall 112 and the power storage element unit 15 is provided between the wall (side wall 112) of the exterior body 10e in the Y-axis direction and the power storage element unit 15. is located. The power storage element unit 15 further includes a second member 50 (spacer 70) that forms a facing portion 55e that faces the first member 580 in the Z-axis direction. The first member 580 has a melting portion 585 provided at an end in the Z-axis direction. In power storage device 1e shown in FIG. 11, the Y-axis direction is an example of the first direction.
　このように構成された場合であっても、第一部材５８０により、少なくとも、蓄電素子ユニット１５の側壁部１１２に近づく方向（Ｙ軸プラス方向）への移動が制限される。さらに、溶融部５８５が、第一部材５８０の、スペーサ７０に対向する端部に設けられていることで、溶融部８５が、スペーサ７０の位置または形状に沿って形成される。その結果、第一部材５８０による蓄電素子ユニット１５を押さえる力（Ｙ軸マイナス方向の力）が不十分となり難く、かつ、過大にもなり難い。従って、外装体１０ｅの内部における蓄電素子ユニット１５の位置の安定性が向上される。 Even with this configuration, the first member 580 restricts at least the movement of the power storage element unit 15 in the direction approaching the side wall portion 112 (Y-axis positive direction). Further, by providing the melting portion 585 at the end of the first member 580 facing the spacer 70, the melting portion 85 is formed along the position or shape of the spacer 70. As a result, the force (force in the negative direction of the Y-axis) exerted by the first member 580 to press down the power storage element unit 15 is unlikely to be insufficient or excessive. Therefore, the stability of the position of power storage element unit 15 inside exterior body 10e is improved.
　蓄電素子ユニット１５における、第一部材５８０とＹ軸方向で対向する部分を形成する第二部材５０は、スペーサ７０ではなくバスバーホルダ５１であってもよい。第一部材５８０は、第一方向の別の一例であるＸ軸方向における外装体１０ｅの壁部（側壁部１１３、図２参照）と蓄電素子ユニット１５との間に配置されてもよい。この場合、蓄電素子ユニット１５が有する、図示しないセル間ホルダまたは絶縁フィルムが、第一部材５８０とＸ軸方向で対向する部分を形成する第二部材５０として機能してもよい。 The second member 50 that forms a portion of the power storage element unit 15 that faces the first member 580 in the Y-axis direction may be the bus bar holder 51 instead of the spacer 70. The first member 580 may be arranged between the wall portion of the exterior body 10e (the side wall portion 113, see FIG. 2) and the power storage element unit 15 in the X-axis direction, which is another example of the first direction. In this case, an inter-cell holder or an insulating film (not shown) included in the power storage element unit 15 may function as the second member 50 that forms a portion facing the first member 580 in the X-axis direction.
　Ｙ軸方向またはＸ軸方向における外装体１０ｅの壁部（側壁部１１２または１１３）と蓄電素子ユニット１５との間に第一部材５８０が配置される場合、外装体１０ｅは、壁部１２５を有する蓋体１２０を備えなくてもよい。つまり、外装体１０ｅは、外装体本体１１０のみで構成されてもよい。 When the first member 580 is disposed between the wall portion (side wall portion 112 or 113) of the exterior body 10e and the power storage element unit 15 in the Y-axis direction or the X-axis direction, the exterior body 10e has the wall portion 125. The lid 120 may not be provided. That is, the exterior body 10e may be composed of only the exterior body body 110.
　図９に示す第一部材２８０、並びに、図１０に示す第一部材３８０及び突出部４８０が、図１１に示す第一部材５８０と同じように、Ｙ軸方向またはＸ軸方向における外装体１０の壁部（側壁部１１２または１１３）と蓄電素子ユニット１５との間に配置されてもよい。 The first member 280 shown in FIG. 9, the first member 380 and the protrusion part 480 shown in FIG. 10 are similar to the first member 580 shown in FIG. It may be arranged between the wall portion (side wall portion 112 or 113) and the power storage element unit 15.
　第一部材８０を挟んで外装体１０の壁部１２５とは反対側の第二部材５０は、バスバーホルダ５１またはスペーサ７０には限定されない。例えば、蓄電素子列２５と外装体１０の壁部１２５との間に配置される中蓋または電装品トレーが、第一部材８０に直接的に押さえられる第二部材５０として配置されてもよい。Ｙ軸方向に並ぶ少なくとも２つの蓄電素子２０を保持するセル間ホルダが、第二部材５０として採用されてもよい。これにより、蓄電素子ユニット１５が有する複数の蓄電素子２０それぞれの移動を、比較的に少ない数の第一部材８０で効率よく制限できる。 The second member 50 on the opposite side of the wall portion 125 of the exterior body 10 with the first member 80 in between is not limited to the bus bar holder 51 or the spacer 70. For example, an inner lid or an electrical component tray disposed between the power storage element array 25 and the wall portion 125 of the exterior body 10 may be disposed as the second member 50 that is directly pressed by the first member 80. An inter-cell holder that holds at least two power storage elements 20 lined up in the Y-axis direction may be employed as the second member 50. Thereby, the movement of each of the plurality of power storage elements 20 included in the power storage element unit 15 can be efficiently restricted by a relatively small number of first members 80.
　第一部材８０とＺ軸方向で対向する部分を形成する第二部材５０は、１つの第一部材８０に対して複数配置されてもよい。言い換えると、１つの第一部材８０が、Ｚ軸方向で対向する位置にある複数の第二部材５０を一括して押さえてもよい。このことによっても、蓄電素子ユニット１５が有する複数の蓄電素子２０それぞれの移動を、比較的に少ない数の第一部材８０で、効率よく制限できる。 A plurality of second members 50 forming a portion facing the first member 80 in the Z-axis direction may be arranged with respect to one first member 80. In other words, one first member 80 may collectively press a plurality of second members 50 located at opposing positions in the Z-axis direction. Also by this, the movement of each of the plurality of power storage elements 20 included in the power storage element unit 15 can be efficiently restricted by a relatively small number of first members 80.
　蓄電素子ユニット１５が有する複数の蓄電素子２０の並び方向は、Ｙ軸方向には限定されない。複数の蓄電素子２０は、Ｘ軸方向に並べられてもよく、Ｚ軸方向に並べられてもよい。いずれの場合であっても、外装体１０の壁部１２５と蓄電素子ユニット１５との間に第一部材８０を配置することで、蓄電素子ユニット１５の位置の安定性の向上効果を得ることができる。このことは、Ｙ軸方向またはＸ軸方向において蓄電素子ユニット１５と第一部材５８０（図１１参照）とが並ぶ場合においても同じである。 The direction in which the plurality of power storage elements 20 included in the power storage element unit 15 are arranged is not limited to the Y-axis direction. The plurality of power storage elements 20 may be arranged in the X-axis direction or in the Z-axis direction. In either case, by arranging the first member 80 between the wall portion 125 of the exterior body 10 and the power storage element unit 15, it is possible to obtain the effect of improving the stability of the position of the power storage element unit 15. can. This also applies when power storage element unit 15 and first member 580 (see FIG. 11) are lined up in the Y-axis direction or the X-axis direction.
　外装体１０の形状は略直方体形状（箱状）である必要はない。例えば、一端が閉じられた円筒状の外装体本体と、円形の開口部を塞ぐ、平面視で円形状の蓋体で構成された外装体の内部に第一部材が配置されてもよい。この場合であっても、円形状の蓋体の一部と、外装体に収容された蓄電素子ユニットとの間に、端部に溶融部が設けられた第一部材が配置されることで、蓄電素子ユニットの移動が制限される。さらに、第一部材による蓄電素子ユニットを押さえる力が不十分となり難く、かつ、過大にもなり難い。 The shape of the exterior body 10 does not need to be a substantially rectangular parallelepiped shape (box shape). For example, the first member may be disposed inside an exterior body that includes a cylindrical exterior body body with one end closed and a lid body that is circular in plan view and closes a circular opening. Even in this case, by disposing the first member having the melting part at the end between a part of the circular lid body and the power storage element unit housed in the exterior body, Movement of the power storage element unit is restricted. Furthermore, the force with which the power storage element unit is pressed by the first member is unlikely to be insufficient or excessive.
　外装体１０は、内部を密封する構造である必要はない。例えば、側壁部１１２等の壁部に１以上の貫通孔（開口部）が設けられていてもよい。複数の棒状部材（フレーム）が組み合わされることで形成された構造体が、蓄電素子ユニット１５を収容する外装体として採用されてもよい。 The exterior body 10 does not need to have a structure that seals the inside. For example, one or more through holes (openings) may be provided in a wall such as the side wall 112. A structure formed by combining a plurality of rod-shaped members (frames) may be employed as the exterior body that houses the power storage element unit 15.
　上記の、実施の形態に係る蓄電装置１についての各種の補足事項は、図７～図１０に示す、変形例１～４に係る蓄電装置１ａ～１ｄのそれぞれに適宜採用されてもよい。上記実施の形態及びその変形例に含まれる構成要素を任意に組み合わせて構築される形態も、本発明の範囲内に含まれる。 The various supplementary matters regarding power storage device 1 according to the embodiment described above may be appropriately adopted in each of power storage devices 1a to 1d according to Modifications 1 to 4 shown in FIGS. 7 to 10. Embodiments constructed by arbitrarily combining the components included in the above embodiments and their modifications are also included within the scope of the present invention.
　本発明は、リチウムイオン二次電池などの蓄電素子を備えた蓄電装置に適用できる。 The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.
　　　１、１ａ、１ｂ、１ｃ、１ｄ、１ｅ　蓄電装置
　　１０、１０ｅ　外装体
　　１５　蓄電素子ユニット
　　２０　蓄電素子
　　５０　第二部材
　　５１　バスバーホルダ
　　５５、５５ａ、５５ｂ、５５ｃ、５５ｄ、５５ｅ、５５ｆ、７５　対向部
　　７０　スペーサ
　　７１　上壁部
　　８０、８０ａ、８０ｂ、８０ｃ、８０ｄ、８０ｅ、１８０、２８０、３８０、４８０ｄ、５８０　第一部材
　　８５、８５ａ、８５ｂ、８５ｃ、８５ｄ、８５ｅ、１８５、２８５ａ、２８５ｂ、３８５、４８５、５８５　溶融部
　１１０　外装体本体
　１１１　開口部
　１１２、１１３、１２２、１２３　側壁部
　１２０　蓋体
　１２５　壁部
　３８０ｄ、４８０　突出部 1, 1a, 1b, 1c, 1d, 1e Power storage device 10, 10e Exterior body 15 Power storage element unit 20 Power storage element 50 Second member 51 Bus bar holder 55, 55a, 55b, 55c, 55d, 55e, 55f, 75 Opposing part 70 Spacer 71 Upper wall portion 80, 80a, 80b, 80c, 80d, 80e, 180, 280, 380, 480d, 580 First member 85, 85a, 85b, 85c, 85d, 85e, 185, 285a, 285b, 385, 485 , 585 melting part 110 exterior main body 111 opening 112, 113, 122, 123 side wall 120 lid 125 wall 380d, 480 protrusion

Claims (6)

  1. 　１以上の蓄電素子を有する蓄電素子ユニットと、
    　前記蓄電素子ユニットを収容する外装体とを備え、
    　第一方向における前記外装体の壁部と前記蓄電素子ユニットとの間には、前記壁部及び前記蓄電素子ユニットの少なくとも一方に接続された第一部材が配置されており、
    　前記蓄電素子ユニットはさらに、前記第一部材と前記第一方向で対向する部分を形成する第二部材を有し、
    　前記第一部材は、前記第一方向の端部に設けられた溶融部を有する、
    　蓄電装置。     a power storage element unit having one or more power storage elements;
    an exterior body that houses the electricity storage element unit,
    A first member connected to at least one of the wall and the power storage element unit is disposed between the wall of the exterior body and the power storage element unit in the first direction,
    The electricity storage element unit further includes a second member forming a portion facing the first member in the first direction,
    The first member has a melting part provided at an end in the first direction.
    Power storage device.
  2. 　前記第一部材と、前記壁部及び前記第二部材の少なくとも一方とは、前記溶融部において溶着されている、
    　請求項１記載の蓄電装置。     The first member and at least one of the wall portion and the second member are welded at the melting portion.
    The power storage device according to claim 1.
  3. 　前記１以上の蓄電素子は、前記第一方向と直交する第二方向に並んで配置された複数の蓄電素子であり、
    　前記第二部材の少なくとも一部は、前記第一方向において前記複数の前記蓄電素子と前記壁部との間に位置し、かつ、前記第二方向において、前記複数の前記蓄電素子のうちの２以上の前記蓄電素子に亘って配置されている、
    　請求項１または２記載の蓄電装置。     The one or more power storage elements are a plurality of power storage elements arranged in a second direction orthogonal to the first direction,
    At least a portion of the second member is located between the plurality of power storage elements and the wall in the first direction, and two of the plurality of power storage elements are located in the second direction. Arranged over the above-mentioned electricity storage elements,
    The power storage device according to claim 1 or 2.
  4. 　前記壁部と前記第二部材との間には、３以上の前記第一部材が配置されており、
    　前記３以上の前記第一部材のそれぞれは、前記第一方向から見た場合に互いに重複しない位置に配置されている、
    　請求項３記載の蓄電装置。     Three or more of the first members are arranged between the wall portion and the second member,
    Each of the three or more first members is arranged at a position that does not overlap with each other when viewed from the first direction,
    The power storage device according to claim 3.
  5. 　前記外装体は、前記蓄電素子ユニットが挿入可能な大きさの開口部を有する外装体本体と、前記開口部を塞ぐ蓋体とを有し、
    　前記壁部は前記蓋体の一部である、
    　請求項１または２記載の蓄電装置。     The exterior body includes an exterior body body having an opening large enough to allow insertion of the electricity storage element unit, and a lid body that closes the opening,
    the wall portion is a part of the lid body;
    The power storage device according to claim 1 or 2.
  6. 　１以上の蓄電素子を有する蓄電素子ユニットと、
    　前記蓄電素子ユニットを収容する外装体とを備え、
    　第一方向における前記外装体の壁部と前記蓄電素子ユニットとの間には、第一部材が配置されており、
    　前記第一部材と前記壁部とは、前記第一部材の前記第一方向の端部に設けられた溶融部で接続されている、
    　蓄電装置。     a power storage element unit having one or more power storage elements;
    an exterior body that houses the electricity storage element unit;
    A first member is disposed between the wall of the exterior body and the power storage element unit in the first direction,
    The first member and the wall portion are connected by a fusion portion provided at an end portion of the first member in the first direction.
    Power storage device.
PCT/JP2023/033467 2022-09-16 2023-09-14 Power storage device WO2024058235A1 (en)

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Citations (5)

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JP2015022909A (en) * 2013-07-19 2015-02-02 住友電気工業株式会社 Secondary battery pack and mobile body including the same, and method for fixing secondary battery
WO2019181501A1 (en) * 2018-03-23 2019-09-26 株式会社Ｇｓユアサ Power storage device
CN111933859A (en) * 2020-09-16 2020-11-13 杭州途视信息技术有限公司 Device for preventing lithium battery from spontaneous combustion
JP2021009786A (en) * 2019-06-28 2021-01-28 三洋電機株式会社 Power supply device, electric vehicle and power storage device having the power supply device, battery cell unit, method for manufacturing power supply device
WO2021059948A1 (en) * 2019-09-24 2021-04-01 株式会社Ｇｓユアサ Electrical storage device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015022909A (en) * 2013-07-19 2015-02-02 住友電気工業株式会社 Secondary battery pack and mobile body including the same, and method for fixing secondary battery
WO2019181501A1 (en) * 2018-03-23 2019-09-26 株式会社Ｇｓユアサ Power storage device
JP2021009786A (en) * 2019-06-28 2021-01-28 三洋電機株式会社 Power supply device, electric vehicle and power storage device having the power supply device, battery cell unit, method for manufacturing power supply device
WO2021059948A1 (en) * 2019-09-24 2021-04-01 株式会社Ｇｓユアサ Electrical storage device
CN111933859A (en) * 2020-09-16 2020-11-13 杭州途视信息技术有限公司 Device for preventing lithium battery from spontaneous combustion

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