WO2014050770A1 - 蓄電装置及び蓄電モジュール - Google Patents
蓄電装置及び蓄電モジュール Download PDFInfo
- Publication number
- WO2014050770A1 WO2014050770A1 PCT/JP2013/075598 JP2013075598W WO2014050770A1 WO 2014050770 A1 WO2014050770 A1 WO 2014050770A1 JP 2013075598 W JP2013075598 W JP 2013075598W WO 2014050770 A1 WO2014050770 A1 WO 2014050770A1
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- WIPO (PCT)
- Prior art keywords
- case
- electrode terminal
- power storage
- positive electrode
- cylindrical portion
- Prior art date
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- 230000005611 electricity Effects 0.000 title claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 239000011888 foil Substances 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- -1 nickel metal hydride Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
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- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/561—Hollow metallic terminals, e.g. terminal bushings
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/514—Methods for interconnecting adjacent batteries or cells
- H01M50/517—Methods for interconnecting adjacent batteries or cells by fixing means, e.g. screws, rivets or bolts
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a power storage device and a power storage module.
- Such a secondary battery has an electrode assembly including a positive electrode, a negative electrode, and a separator laminated in layers (see, for example, Patent Document 1).
- the separator insulates between the positive electrode and the negative electrode.
- the secondary battery described in Patent Document 1 includes an electrode terminal that transmits and receives electricity to and from the electrode.
- the electrode terminal has a disk part housed inside the case and a rod-shaped part extending from the disk part.
- the rod-shaped portion of the electrode terminal protrudes outside the case through a through hole formed in the case.
- the external thread part is formed in the outer surface of the rod-shaped part of an electrode terminal. The nut is screwed onto the male screw portion of the electrode terminal, whereby the electrode terminal is fastened and fixed to the case.
- the electrode terminals of a plurality of secondary batteries are electrically connected by a bus bar. It may be used as an assembled battery connected in series or in parallel.
- a female screw portion is formed on the tip end surface of the rod-shaped portion of the electrode terminal, and a bolt is screwed to the female screw portion, thereby fastening the bus bar between the bolt and the electrode terminal. It is possible to do.
- the electrode terminal when the bolt is screwed into the female screw portion of the electrode terminal, the electrode terminal may rotate so as to be rotated with the bolt based on the rotational torque transmitted from the bolt to the electrode terminal. Then, when the electrode terminal is rotated so as to be rotated around the bolt, the tightening force of the electrode terminal with respect to the case may decrease due to loosening of the nut with respect to the electrode terminal.
- An object of the present invention is to provide a power storage device and a power storage module that can suppress a decrease in fastening force of an electrode terminal to a case.
- a power storage device includes a case, an electrode assembly housed in the case, and an electrode terminal that transmits and receives electricity between the electrode assembly.
- the electrode terminal includes a cylindrical portion having a portion protruding to the outside of the case.
- the outer peripheral surface of the cylindrical part has a male screw part into which a nut for fastening the electrode terminal to the case is screwed from the outside of the case.
- the inner peripheral surface of the cylindrical portion has a female screw portion whose screw direction is opposite to that of the male screw portion.
- FIG. 1 is a partially broken perspective view of a secondary battery according to an embodiment of the present invention.
- FIG. 4 is an exploded perspective view of the positive terminal portion of FIG. 3.
- the perspective view of the assembled battery containing the secondary battery of FIG. The principal part expanded sectional view of the positive electrode terminal part by which the bus-bar was fastened.
- a secondary battery 10 as a power storage device includes a case 11 having a flat and substantially rectangular parallelepiped shape as a whole.
- the case 11 includes a main body member 12 having a flat rectangular box shape and a lid member 13 having a rectangular flat plate shape that closes the opening 12 a of the main body member 12.
- the main body member 12 and the lid member 13 are both made of metal (for example, stainless steel or aluminum).
- the secondary battery 10 of this embodiment is a lithium ion secondary battery.
- the case 11 accommodates an electrode assembly 18 in which a positive electrode 15 and a negative electrode 16 are laminated so as to form a layer with a separator 17 interposed therebetween.
- the electrode assembly 18 is accommodated in the case 11 while being covered with an insulating member (not shown).
- an electrolytic solution is injected into the case 11.
- the positive electrode 15 includes a positive electrode metal foil 15a having a rectangular sheet shape, and a positive electrode active material layer 15b formed by a positive electrode active material applied to both surfaces of the positive electrode metal foil 15a. Yes. Moreover, the positive electrode 15 has the uncoated part 15c in which the positive electrode active material is not apply
- the negative electrode 16 includes a negative electrode metal foil 16a having a rectangular sheet shape, and a negative electrode active material layer 16b formed of a negative electrode active material applied to both surfaces of the negative electrode metal foil 16a. Moreover, the negative electrode 16 has the uncoated part 16c in which the negative electrode active material is not apply
- the positive electrode 15 is laminated in a certain direction so that the positive electrode tab 15e overlaps
- the negative electrode 16 is laminated in a certain direction so that the negative electrode tab 16e overlaps.
- the positive electrode 15 and the negative electrode 16 are laminated such that the positive electrode tab 15e of the positive electrode 15 and the negative electrode tab 16e of the negative electrode 16 do not overlap.
- a plurality of positive electrode tabs 15e are collected at one end in the stacking direction of the electrode assembly 18 and stacked in a layered manner to constitute a positive electrode tab group 20.
- the positive electrode tab group 20 is electrically connected to a positive electrode terminal 23 as an electrode terminal via a positive electrode conductive member 21 (see FIG. 3).
- the positive terminal 23 constitutes a positive terminal 22.
- the plurality of negative electrode tabs 16e are collected at one end in the stacking direction of the electrode assembly 18 and stacked in a layered manner to constitute the negative electrode tab group 24.
- the negative electrode tab group 24 is electrically connected to a negative electrode terminal 27 as an electrode terminal via a negative electrode conductive member (not shown).
- the negative terminal 27 constitutes the negative terminal portion 26.
- the positive terminal 23 and the negative terminal 27 exchange electricity with the electrode assembly 18.
- the configuration of the positive terminal portion 22 is the same as that of the positive electrode terminal portion 22.
- the positive electrode terminal 23 has a substantially rectangular parallelepiped base portion 42 joined to the positive electrode conductive member 21 and an end surface 42 a opposite to the end surface 42 a joined to the positive electrode conductive member 21 at the base portion 42. And a cylindrical tubular portion 43 protruding from the end face 42b of the first cylindrical member.
- a male screw portion 44 whose screw direction is the counterclockwise direction is formed over the entire region in the protruding direction of the cylindrical portion 43.
- a female screw portion 46 whose screw direction is a clockwise direction is formed over the entire region in the protruding direction of the cylindrical portion 43. That is, the screw direction of the male screw portion 44 and the screw direction of the female screw portion 46 are opposite to each other.
- a circular through hole 50 that communicates the inside and the outside of the case 11 is formed at a portion corresponding to the positive electrode terminal 23 in the case 11.
- the diameter of the through hole 50 is set slightly larger than the outer diameter of the cylindrical portion 43 of the positive electrode terminal 23.
- the cylindrical portion 43 of the positive terminal 23 is inserted into the through hole 50 from the inside of the case 11 to the outside. Therefore, a part of the cylindrical portion 43 of the positive electrode terminal 23 protrudes outside the case 11 through the through hole 50.
- an O-ring 51 made of an elastic material is interposed between the base portion 42 of the positive electrode terminal 23 and the inner surface of the case 11.
- the O-ring 51 is fitted to the cylindrical portion 43 of the positive electrode terminal 23 from the outside.
- the O-ring 51 is in contact with the inner surface of the case 11 so as to surround the through hole 50 of the case 11 through which the cylindrical portion 43 of the positive electrode terminal 23 is inserted.
- the O-ring 51 has insulating properties, and is interposed between the base portion 42 of the positive electrode terminal 23 and the case 11 to insulate both members.
- a washer 53 made of an insulating material having a through hole 52 penetrating in the thickness direction is fitted into the cylindrical portion 43 of the positive electrode terminal 23 protruding from the through hole 50 of the case 11 from the outside.
- An annular convex portion 54 is formed on the end surface 53 a of the washer 53 that contacts the outer surface of the case 11 along the edge of the through hole 52.
- the convex part 54 of the washer 53 enters the gap between the cylindrical part 43 of the positive electrode terminal 23 and the hole edge of the through hole 50 of the case 11, so that the cylindrical part 43 of the positive electrode terminal 23 and the case 11.
- the two members are insulated from each other.
- a hexagonal nut 56 as a metal nut having a female screw portion 55 whose screw direction is counterclockwise is screwed into the male screw portion 44 of the cylindrical portion 43 of the positive electrode terminal 23.
- the hexagon nut 56 is in contact with the outer surface of the case 11 via a washer 53 in the protruding direction of the cylindrical portion 43 of the positive electrode terminal 23.
- the protruding amount L1 of the cylindrical portion 43 of the positive terminal 23 from the through hole 50 of the case 11 is larger than the sum of the thickness L2 of the washer 53 and the thickness L3 of the hexagon nut 56. Therefore, the tip end surface of the cylindrical portion 43 of the positive electrode terminal 23 protrudes from the end surface 56 b opposite to the end surface 56 a that contacts the washer 53 in the hexagon nut 56.
- the method for assembling the negative electrode terminal portion 26 to the case 11 is the same as the method for assembling the positive electrode terminal portion 22 to the case 11.
- the hexagon nut 56 comes into close contact with the washer 53 interposed between the outer surface of the case 11.
- the hexagon nut 56 is further screwed into the cylindrical portion 43 of the positive electrode terminal 23
- the cylindrical portion 43 of the positive electrode terminal 23 is moved in the direction toward the outside of the case 11 by the screwed hexagon nut 56. Be energized.
- the base 42 of the positive electrode terminal 23 is pressed against and closely contacts the inner surface of the case 11 via the O-ring 51, whereby the positive electrode terminal 23 is fastened to the case 11.
- the O-ring 51 interposed between the base portion 42 of the positive electrode terminal 23 and the inner surface of the case 11 is pressed against and closely contacts the inner surface of the case 11 by the base portion 42 of the positive electrode terminal 23. Then, the inside of the case 11 is sealed in a liquid-tight manner by closing the through hole 50 of the case 11 through which the cylindrical portion 43 of the positive electrode terminal 23 is inserted with the O-ring 51.
- the plurality of secondary batteries 10 constitute an assembled battery 61 as a power storage module mounted on the vehicle 60 by being connected to each other.
- the positive electrode terminal 23 constituting the positive electrode terminal portion 22 of each secondary battery 10 is connected to the negative electrode terminal 27 of the adjacent secondary battery 10 via a bus bar 70 as a terminal connection member.
- the negative electrode terminal 27 constituting the negative electrode terminal portion 26 of each secondary battery 10 is connected to the positive electrode terminal 23 of the adjacent secondary battery 10 via a bus bar 70 as a terminal connection member.
- the through hole 72 that penetrates in the thickness direction of the bus bar 70 is overlaid on the inner peripheral surface of the cylindrical portion 43 of the positive electrode terminal 23.
- the shaft portion 73 of the bolt 71 is inserted into the through hole 72 of the bus bar 70.
- the shaft 71 of the bolt 71 is inserted inside the cylindrical portion 43 of the positive electrode terminal 23, and the bolt 71 rotates in the clockwise direction that is the screw direction of the male screw portion 63.
- the male screw part 63 of the bolt 71 is screwed into the female screw part 46 formed on the inner peripheral surface of the cylindrical part 43.
- rotational torque acts clockwise from the male threaded portion 63 of the bolt 71 through the female threaded portion 46 to the positive terminal 23.
- the hexagon nut 56 is firmly adhered to the washer 53 interposed between the case 11 and the friction force in the circumferential direction around the cylindrical portion 43. Therefore, even if the positive terminal 23 tries to rotate based on the rotational torque acting from the bolt 71, the hexagon nut 56 is restricted from rotating in the circumferential direction around the cylindrical portion 43 together with the positive terminal 23. Is done.
- the hexagon nut 56 rotates relative to the positive electrode terminal 23 in the counterclockwise direction opposite to the clockwise direction that is the rotation direction of the positive electrode terminal 23.
- the hexagon nut 56 functions as a detent that restricts the positive electrode terminal 23 from rotating around the bolt 71 in the clockwise direction. Therefore, when the bolt 71 is screwed to the positive terminal 23 whose rotation is restricted by the hexagon nut 56, the bus bar 70 is firmly fastened to the cylindrical portion 43 of the positive terminal 23 by the bolt 71.
- the cylindrical portion 43 of the positive electrode terminal 23 is further urged in a direction toward the outside of the case 11 by the screwed hexagon nut 56. Therefore, the O-ring 51 interposed between the base portion 42 of the positive electrode terminal 23 and the inner surface of the case 11 is more firmly pressed against the inner surface of the case 11 by the base portion 42 of the positive electrode terminal 23 and comes into close contact therewith.
- the screw direction of the male screw portion 44 provided in the cylindrical portion 43 of both terminals 23 and 27 and the screw direction of the female screw portion 46 are opposite to each other. Therefore, when the bolt 71 is screwed from the outside of the case 11 to the female thread portion 46 of the cylindrical portion 43 of both the terminals 23 and 27, when both the terminals 23 and 27 try to rotate with the bolt 71, The hexagon nut tends to rotate relative to the terminals 23 and 27 in the direction opposite to the rotation direction of the terminals 23 and 27. As a result, rotational torque acts in the tightening direction from the hexagon nut 56 to the male threaded portions 44 of the terminals 23 and 27.
- the bolts 71 are screwed into the female screw portions 46 of the cylindrical portions 43 of the terminals 23 and 27 whose rotations are restricted by the hexagon nut 56, whereby the cylindrical portions 43 and the bolts of the terminals 23 and 27 are bolted.
- the bus bar 70 can be firmly fastened to the 71.
- the bus bar 70 is fastened by the bolt 71 to the cylindrical portion 43 of the both terminals 23 and 27 whose rotation is restricted by the hexagon nut 56. Therefore, even if an oxide film with low conductivity is formed on the tip surface of the cylindrical portion 43 in contact with the bus bar 70 at both terminals 23 and 27, the oxide film is scraped off and removed by the bus bar 70. Therefore, the electrical resistance at the contact interface between the cylindrical portion 43 of both terminals 23 and 27 and the bus bar 70 can be further reduced.
- the tip surfaces of the cylindrical portions 43 of the terminals 23 and 27 may be positioned at the same height as the end surface 56 b of the hexagon nut 56.
- both terminals 23 and 27 not only conduct electricity to the bus bar 70 through the contact interface between the tubular portion 43 and the bus bar 70, but also pass through the hexagon nut 56. Electricity is conducted to the bus bar 70. Therefore, the electrical resistance between the terminals 23 and 27 and the bus bar 70 can be reduced.
- the cylindrical portions 43 of the terminals 23 and 27 may be configured such that the screw direction of the male screw portion 44 is a clockwise direction and the screw direction of the female screw portion 46 is a counterclockwise direction.
- the cylindrical portion 43 of both terminals 23, 27 does not form the male screw portion 44 at the base end side portion accommodated in the case 11, and the cylindrical portion 43 of both terminals 23, 27 has the cylindrical portion 43.
- the male screw portion 44 may be formed only at the tip side portion protruding from the through hole 50.
- the tubular portions 43 of the terminals 23 and 27 do not necessarily have to be hollow in the entire protruding direction.
- the cylindrical part 43 of both the terminals 23 and 27 may be comprised in the bottomed cylindrical shape from which the upper part makes a hollow shape from the middle position of the protrusion direction.
- the nut screwed into the male thread portion 44 of the cylindrical portion 43 of both terminals 23 and 27 is not limited to the hexagon nut 56, and a nut having an arbitrary shape can be adopted.
- the member screwed into the female thread portion 46 of the cylindrical portion 43 of both terminals 23 and 27 is not limited to the bolt 71 for fastening the bus bar 70 to the cylindrical portion 43 of both terminals 23 and 27.
- the external terminal may be screwed to the female thread portion 46 of the cylindrical portion 43 of both terminals 23 and 27.
- the present invention is embodied in the laminated secondary battery 10, but the present invention is embodied in a wound secondary battery in which a belt-like positive electrode and a belt-like negative electrode are wound and laminated in layers. Also good.
- the vehicle 60 on which the assembled battery 61 of the embodiment is mounted may be an automobile or an industrial vehicle.
- the secondary battery 10 is a lithium ion secondary battery, but is not limited thereto, and may be another secondary battery such as nickel metal hydride.
- the power storage device is not limited to the secondary battery 10 and may be a capacitor such as an electric double layer capacitor or a lithium ion capacitor.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Mounting, Suspending (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
図1に示すように、蓄電装置としての二次電池10は、全体として扁平な略直方体状をなすケース11を備えている。ケース11は、扁平な矩形箱状をなす本体部材12と、本体部材12の開口部12aを閉塞する矩形平板状をなす蓋部材13とを含む。本体部材12及び蓋部材13は、何れも金属(例えばステンレスやアルミニウム)によって構成されている。なお、本実施形態の二次電池10は、リチウムイオン二次電池である。
図3及び図4に示すように、正極端子23は、正極導電部材21に対して接合される略直方体状の基部42と、基部42において正極導電部材21に接合される端面42aとは反対側の端面42bから突出した円筒状の筒状部43とを有している。
図5に示すように、複数の二次電池10は、互いに接続されることで車両60に搭載される蓄電モジュールとしての組電池61を構成する。組電池61を構成する場合、各二次電池10の正極端子部22を構成する正極端子23は隣り合う二次電池10の負極端子27に端子接続部材としてのバスバー70を介して接続される。各二次電池10の負極端子部26を構成する負極端子27は隣り合う二次電池10の正極端子23に端子接続部材としてのバスバー70を介して接続される。そして、本実施形態の二次電池10では、両端子部22,26がケース11に対して組み付けられた状態で、両端子部22,26を構成する両端子23,27の筒状部43の雌ねじ部46に締結用のボルト71をそれぞれ螺合させることにより、両端子23,27の筒状部43とバスバー70とが締結固定される。
(1)両端子23,27の筒状部43に設けられた雄ねじ部44のねじ方向と雌ねじ部46のねじ方向とが逆回りとなっている。そのため、両端子23,27の筒状部43の雌ねじ部46に対してケース11の外部からボルト71を螺合させる場合に、両端子23,27がボルト71に連れ回って回転しようとすると、六角ナットが両端子23,27に対して両端子23,27の回動方向とは反対方向に相対回動しようとする。その結果、六角ナット56から両端子23,27の雄ねじ部44に対して締め付け方向に回転トルクが作用する。したがって、両端子23,27の筒状部43に対する六角ナット56の締め付けが緩むことが抑制されるため、ケース11に対する両端子23,27の締結力が低下することを抑制できる。また、この場合、両端子23,27の基部42とケース11との間でOリング51が六角ナット56によって強固に締結されるため、ケース11の内部のシール性を信頼性良く確保することができる。
実施形態において、図7に示すように、両端子23,27の筒状部43の先端面が六角ナット56の端面56bと同一の高さに位置してもよい。
実施形態において、両端子23,27の筒状部43においてケース11に収容される基端側の部位に雄ねじ部44を形成することなく、両端子23,27の筒状部43においてケース11の貫通孔50から突出する先端側の部位にのみ雄ねじ部44を形成してもよい。
実施形態において、両端子23,27の筒状部43の雌ねじ部46に螺合する部材は、両端子23,27の筒状部43に対してバスバー70を締結するためのボルト71に限定されない。例えば、外部端子を両端子23,27の筒状部43の雌ねじ部46に対して螺合させてもよい。
実施形態の組電池61を搭載する車両60は、自動車でも良いし、産業用車両でも良い。
蓄電装置は、二次電池10に限らず、例えば、電気二重層キャパシタやリチウムイオンキャパシタ等のようなキャパシタであってもよい。
Claims (6)
- ケースと、
前記ケースに収容された電極組立体と、
前記電極組立体との間で電気を授受する電極端子であって、該電極端子は前記ケースの外側に突出する部位を有する筒状部を含む、前記電極端子と、を備え、
前記筒状部の外周面は、前記ケースに対して前記電極端子を締結させるナットが前記ケースの外側から螺合される雄ねじ部を有しており、
前記筒状部の内周面は、前記雄ねじ部とはねじ方向が逆回りの雌ねじ部を有する蓄電装置。 - 前記電極端子には、当該電極端子と前記電極組立体とを電気的に接続する導電部材が接合されている請求項1に記載の蓄電装置。
- 前記雄ねじ部のねじ方向が左回り方向であり、前記雌ねじ部のねじ方向が右回り方向である請求項1又は請求項2に記載の蓄電装置。
- 前記蓄電装置は、二次電池である請求項1~請求項3のうち何れか一項に記載の蓄電装置。
- 請求項1~請求項4のうち何れか一項に記載の蓄電装置を複数接続して構成した蓄電モジュールであって、
前記筒状部の前記雌ねじ部に螺合されたボルトと、
前記筒状部において前記ケースから突出した先端面と前記ボルトとの間に締結され、複数の前記蓄電装置にそれぞれ設けられる前記電極端子同士と電気的に接続された端子接続部材と
を更に備える蓄電モジュール。 - 前記筒状部の先端面は、前記筒状部の突出方向において前記ナットにおける前記ケースに接する端面とは反対側の端面よりも前記ケースから突出している請求項5に記載の蓄電モジュール。
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CN201380050075.4A CN104662710A (zh) | 2012-09-28 | 2013-09-23 | 蓄电装置及蓄电模块 |
DE112013004775.6T DE112013004775B4 (de) | 2012-09-28 | 2013-09-23 | Elektrische Speichervorrichtung und elektrisches Speichermodul |
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JP2014102898A (ja) * | 2012-11-16 | 2014-06-05 | Toyota Industries Corp | 蓄電装置 |
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DE102017108564A1 (de) * | 2017-04-21 | 2018-10-25 | Federal-Mogul Sealing Systems Gmbh | Verliersicherung und montagehilfe für ein abschirmblech |
DE112019004177T5 (de) * | 2018-08-22 | 2021-05-20 | Kabushiki Kaisha Toyota Jidoshokki | Energiespeichermodul und Herstellungsverfahren eines Energiespeichermoduls |
JPWO2020129154A1 (ja) * | 2018-12-18 | 2021-10-28 | 昭和電工マテリアルズ株式会社 | ブッシュ、鉛蓄電池及び組電池 |
DE102019213897A1 (de) * | 2019-09-11 | 2021-03-11 | Robert Bosch Gmbh | Deckelbaugruppe eines Batteriezellengehäuses, Verfahren zu deren Herstellung und Verwendung einer solchen |
US10948221B1 (en) * | 2020-07-30 | 2021-03-16 | Hecto Group, Llc | System for cooling an object or a space with an endothermic salt solution and a distillation membrane |
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US20150228959A1 (en) | 2015-08-13 |
CN104662710A (zh) | 2015-05-27 |
DE112013004775T5 (de) | 2015-08-27 |
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