WO2011040297A1 - Electric storage device assembly structure and electric storage device unit structure - Google Patents

Electric storage device assembly structure and electric storage device unit structure Download PDF

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Publication number
WO2011040297A1
WO2011040297A1 PCT/JP2010/066372 JP2010066372W WO2011040297A1 WO 2011040297 A1 WO2011040297 A1 WO 2011040297A1 JP 2010066372 W JP2010066372 W JP 2010066372W WO 2011040297 A1 WO2011040297 A1 WO 2011040297A1
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WO
WIPO (PCT)
Prior art keywords
connection terminal
storage device
electrode connection
positive electrode
assembly structure
Prior art date
Application number
PCT/JP2010/066372
Other languages
French (fr)
Japanese (ja)
Inventor
一博 阿部
康浩 玉谷
Original Assignee
株式会社 村田製作所
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Filing date
Publication date
Application filed by 株式会社 村田製作所 filed Critical 株式会社 村田製作所
Priority to JP2011534208A priority Critical patent/JPWO2011040297A1/en
Publication of WO2011040297A1 publication Critical patent/WO2011040297A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
    • H01G11/12—Stacked hybrid or EDL capacitors
    • 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
    • H01M50/296—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by terminals of battery packs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • 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
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch 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
    • H01M50/273—Lids or covers for the racks or secondary casings characterised by the material
    • H01M50/276—Inorganic material
    • 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
    • H01M50/291—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 characterised by their shape
    • 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
    • H01M50/293—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 characterised by the material
    • 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
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides 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
    • 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
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • 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 generally relates to an electricity storage device unit structure and an electricity storage device assembly structure, and specifically, a lithium ion secondary battery, a lithium secondary battery, a polymer secondary battery, an organic radical battery, an all-solid battery, A power storage device assembly structure configured by electrically connecting a plurality of power storage devices that house a power storage element such as an electric double layer capacitor using a flexible outer packaging member, and the power storage device assembly structure
  • the present invention relates to individual power storage device unit structures.
  • an electricity storage device such as a lithium ion secondary battery
  • portable electronic devices such as portable telephones, notebook computers and digital cameras
  • power source for automobiles and other motors there are increasing demands for downsizing, weight reduction, and thickness reduction.
  • power supply applications it is required to increase the capacity of power storage devices in accordance with the diversification of usage modes and usage conditions of electronic devices and motors.
  • a power storage device assembly structure is known in which a plurality of power storage devices are connected in series and / or in parallel to form a unit.
  • Patent Document 1 A cell module which is an example of such a power storage device assembly structure is disclosed in Japanese Patent No. 3912201 (hereinafter referred to as Patent Document 1). As shown in FIG. 1, FIG. 2, and FIG. 4 of Patent Document 1, in this cell module, a plurality of both tab-type cells having a sheet-like positive electrode terminal 1b and a negative electrode terminal 1c are arranged in series, By connecting each terminal to the substantially plate-like bus bars 2A and 2B respectively arranged in the terminal extending direction, one cell unit is configured. A plurality of the cell units are stacked and disposed so that the bus bars 2A and 2B having different polarities face each other, thereby forming a cell module.
  • the cell module passes through through holes formed in the bus bars 2A and 2B of each cell unit and penetrating in the stacking direction of the cell units and through holes of the plurality of bus bars 2A and 2B arranged in the stacking direction.
  • Rods 3A, 3B, and 3C as positioning members for positioning 2B at a predetermined position with respect to a direction orthogonal to the stacking direction.
  • the positioning member includes a rod 3A as a conductive columnar member that electrically connects bus bars 2A and 2B set at the same potential adjacent in the stacking direction, and bus bars set at different potentials adjacent in the stacking direction. It is formed by alternately connecting rods 3B and 3C as insulating columnar members that are electrically insulated in the stacking direction.
  • the plurality of cell units are connected in series by a rod 3A as a conductive columnar member. In the cell module disclosed in Patent Document 1, the bus bars 2A and 2B of each cell unit are fixed to the rod 3A by welding.
  • JP 2006-19075 A discloses an assembled battery in which flat batteries are stacked in the thickness direction as an example of a power storage device assembly structure.
  • a flat battery an electrode tab drawn out in the length direction from the main body of the flat battery is extended in a width direction intersecting the length direction and is bent from a fold line along the length direction.
  • a bent joint that can be folded in the thickness direction of the battery and is joined to an electrode tab of an adjacent flat battery is provided.
  • flat batteries that are adjacent in the stacking direction are electrically connected to each other by joining their bent joints. Note that the bent joints are joined by ultrasonic welding.
  • the rod 3A as a conductive columnar member is used to electrically connect the substantially plate-shaped bus bars 2A and 2B of each cell unit. ing.
  • the bus bars 2A and 2B are fixed to the rod 3A by welding. Thereby, the substantially plate-like bus bar 2A and the bus bar 2B of each cell unit are electrically connected via the columnar rod 3A. For this reason, the electrical contact resistance between the connected cell units becomes high. Therefore, there is a problem that current collection resistance is large in the cell module as an assembled battery.
  • an object of the present invention is to provide a power storage device assembly structure capable of reducing current collection resistance and easily connecting power storage devices, and each power storage constituting the power storage device assembly structure.
  • a device unit structure is provided.
  • An electrical storage device assembly structure is an electrical storage device assembly structure configured by electrically connecting a plurality of electrical storage devices, and includes a plurality of electrical storage device unit structures and a plurality of electrical storage device unit structures And a connecting member for electrically connecting the body.
  • a power storage device unit structure includes a flexible outer packaging member that houses a power storage element, a positive electrode connection terminal and a negative electrode connection terminal that are electrically connected to the power storage element and led out from the outer packaging member, and a positive electrode connection And an external connection terminal electrically connected to each of the negative electrode connection terminal and the negative electrode connection terminal.
  • the external connection terminal has a connection plane extending in a direction intersecting with the main planes of the positive connection terminal and the negative connection terminal, and is connected to the connection member at the connection plane of the external connection terminal.
  • the external connection terminal of each electricity storage device unit structure intersects the main plane of the positive electrode connection terminal and the negative electrode connection terminal. It connects with a connection member in the connection plane extended in the direction to do. For this reason, the connection plane of the external connection terminal of each power storage device unit structure can be brought into contact with the connection member by surface contact. Thereby, the electrical contact resistance between the electrical storage devices connected can be reduced, ie, the electrical connectivity between electrical storage devices can be improved. Therefore, it is possible to reduce the current collection resistance in the power storage device assembly structure.
  • the external connection terminal and the connecting member of each electricity storage device unit structure can be fixed using a mechanical fixing means. For this reason, since the operation
  • the external connection terminal and the connecting member of each power storage device unit structure can be fixed using a mechanical fixing means, the connection is re-executed when the power storage device unit structure is connected by mistake. be able to.
  • the external connection terminal and the connecting member of each power storage device unit structure can be fixed using mechanical fixing means, only the required number of power storage device unit structures constituting the power storage device assembly structure can be obtained. You can connect them all at once.
  • the connecting member is preferably connected in series and / or in parallel by stacking a plurality of energy storage device unit structures in the thickness direction.
  • a plurality of power storage device unit structures can be connected at the shortest distance using a connecting member, and the current collection resistance can be reduced.
  • the connecting member connects the external connection terminals with a detachable fixing means.
  • the fixing means is preferably one type selected from the group consisting of bolts / nuts, screws and pins.
  • the external connection terminal has a connecting plane formed by bending a plate-like material.
  • the external connection terminal By forming the external connection terminal from the integral plate-like material in this way, it is possible to further reduce the electrical contact resistance between the connected electricity storage devices, that is, the electrical connectivity between the electricity storage devices. It can be improved further.
  • the external connection terminal has a larger thickness than the positive electrode connection terminal and the negative electrode connection terminal.
  • the rigidity can be improved as compared with the case where the relatively thin positive electrode connection terminals and the negative electrode connection terminals are directly connected to each other.
  • the external connection terminals have connection planes disposed on both sides of the positive electrode connection terminal and the negative electrode connection terminal.
  • each of the positive electrode connection terminal and the negative electrode connection terminal and the external connection terminal are electrically connected by laser welding.
  • each of the positive electrode connection terminal and the negative electrode connection terminal can be reliably connected to the external connection terminal.
  • the electricity storage device unit structure includes a container member that houses the outer packaging member, the positive electrode connection terminal, and the negative electrode connection terminal, and the external connection terminal is led out from the container member. Preferably it is.
  • the external connection terminal is supported for every electrical storage device unit structure. be able to.
  • the container member preferably includes a synthetic resin frame member and a metal lid member.
  • the heat dissipation of the electricity storage device unit structure can be improved.
  • the lid member includes an upper lid member and a lower lid member, and the upper lid member and the lower lid member engage with each other to cover at least a part of the frame member.
  • the container member has an insulating property
  • the outer packaging member includes an inner surface layer made of at least a thermoplastic resin, and a metal layer disposed on the outer side of the inner surface layer. It is preferable that the power storage element is sealed by thermally welding the layers. At this time, it is preferable that the positive electrode connection terminal and the negative electrode connection terminal are led out to the outside from the heat-welded inner surface layer.
  • Structuring in this way makes it possible to supplement the outer insulation of the electricity storage element with the container member with respect to the outer packaging member.
  • the positive electrode connecting terminal and the negative electrode connecting terminal are led out from the outer peripheral edge of the outer packaging member in a direction facing each other.
  • the power storage device unit structure includes a relay member that electrically connects the positive electrode connection terminal and the external connection terminal.
  • a curved portion is formed at the connection portion between the positive electrode connection terminal and the relay member.
  • This configuration can relieve stress when undesired external stress, heat shock, or the like is applied to the connection portion.
  • an ultrasonic weld is formed in the curved portion.
  • a power storage device unit structure includes a flexible outer packaging member that houses a power storage element, and a positive electrode connection terminal and a negative electrode connection that are electrically connected to the power storage element and led out from the outer packaging member.
  • the external connection terminal has a connection plane extending in a direction intersecting with the main plane of the positive electrode connection terminal and the negative electrode connection terminal and electrically connected to the external terminal.
  • the electricity storage device can be easily electrically connected to the external terminal by the external connection terminal.
  • the electricity storage device assembly structure of the present invention it is possible to reduce the current collecting resistance and easily connect the electricity storage devices. Moreover, according to the electricity storage device unit structure of the present invention, the electricity storage device can be easily electrically connected to the external terminal by the external connection terminal.
  • FIG. 4 is a partial cross-sectional view illustrating a connection state between an outer packaging member, a positive electrode connection terminal, a negative electrode connection terminal, and an external connection terminal in the unit battery illustrated in FIG. 3.
  • a battery pack 1 which is one embodiment of the electricity storage device assembly structure of the present invention is a unit battery (laminated secondary battery) which is one embodiment of the electricity storage device unit structure.
  • a unit battery laminated secondary battery
  • eight 10 are stacked and electrically connected to each other.
  • four unit cells 10 located in the upper stage are connected in series by the connecting member 20 (four straight lines) to form a set of battery groups, and the four unit batteries 10 located in the lower stage
  • Another set of battery groups is configured by being connected in series by the connecting member 20 (4 series).
  • the battery pack 1 as an assembled battery is comprised by these two sets of battery groups being connected in parallel by the connection member 20 (2 parallel).
  • the unit batteries 10 positioned at the uppermost and lowermost stages of the battery pack 1 are connected to the external positive terminal, and the two unit batteries 10 positioned at the center of the battery pack 1 are connected to the external negative terminal.
  • the eight unit batteries 10 stacked are fixed as the unit battery connecting member 30 using, for example, bolts 31 and nuts 32. In this way, by stacking the eight unit batteries 10 in the thickness direction of the unit battery 10, the battery pack 1 including the unit batteries 10 connected in series and parallel in four series and two parallels is completed.
  • each connection member 20 is connected to each external connection terminal 16.
  • Fixed to. Examples of the fastening member 21 that is a detachable fixing means include bolts (nuts), screws, pins, and the like.
  • the unit battery 10 includes a container member 17.
  • the container member 17 includes a frame member 171 made of synthetic resin and a lid member 172 made of metal. As will be described later, the container member 17 accommodates an outer packaging member, a positive electrode connection terminal, and a negative electrode connection terminal. External connection terminals 16 are led out from both ends of the container member 17 to the outside.
  • a flexible outer packaging member 12 is placed on a member in which a lower frame member 171b, a lower lid member 172b, and an external connection terminal 16 are integrated.
  • the outer packaging member 12 accommodates the battery element 11 as a power storage element.
  • a positive electrode connection terminal 13 (positive electrode tab) and a negative electrode connection terminal 14 (negative electrode tab) are electrically connected to the battery element 11 and led out from the outer packaging member 12.
  • a relay member 15 is electrically connected to the positive electrode connection terminal 13.
  • An upper frame member 171 a having an opening (space portion) 175 is placed on the outer packet member 12 configured as described above. Then, the upper lid member 172a is placed on the upper frame member 171a.
  • the frame member 171 (FIG.
  • the lid member 172 (FIG. 2) includes an upper frame member 171a and a lower frame member 171b.
  • the lid member 172 (FIG. 2) includes an upper lid member 172a and a lower lid member 172b.
  • the upper lid member 172a and the lower lid member 172b are engaged with each other, and a rivet 179 (see FIG. 7) is formed in the through hole 177 formed in the side portion of the upper lid member 172a and the through hole 178 formed in the side portion of the lower lid member 172b. 2) is inserted.
  • the lid member 172 is fixed so as to cover a part of the frame member 171. Since the container member 17 (FIG. 2) configured in this manner includes the synthetic resin frame member 171, the container member 17 (FIG. 2) is insulative with respect to the outer packet member 12.
  • electrode terminal holding portions 173 are disposed at both ends of the lower frame member 171b made of synthetic resin.
  • a metal external connection terminal 16 is built in the electrode terminal holding portion 173.
  • the connection plane 161 of the external connection terminal 16 is led out to the outside of the electrode terminal holding part 173 and exposed, and the electrode terminal connection plane 162 is exposed in the recess of the electrode terminal holding part 173.
  • An opening (space part) 175 is formed at the center of the lower frame member 171b, and an outer member holding part 174 made of a frame-like part surrounding the opening 175 is formed.
  • a metal lower lid member 172b is integrated and fixed under the lower frame member 171b. Thereby, as shown in FIG.
  • the main plane of the lower lid member 172 b is exposed from the opening 175.
  • a through hole 176 is formed in the flat portion of the electrode terminal holding portion 173, and a through hole 176a is formed in the flat portion of the lower lid member 172b.
  • the unit battery 10 is fixed by inserting the bolt 31 (FIG. 1) into the through holes 176 and 176a and fastening with the nut 32.
  • a through hole 163 is formed in the connecting plane 161 of the external connection terminal 16.
  • the flexible outer packaging member 12 accommodates the battery element 11.
  • the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are electrically connected to the battery element 11 and led out from the outer packaging member 12.
  • An external connection terminal 16 is electrically connected to each of the positive electrode connection terminal 13 and the negative electrode connection terminal 14.
  • a relay member 15 (joint tab) is provided so as to electrically connect between the positive electrode connection terminal 13 and the external connection terminal 16.
  • a curved portion 151 is formed at the connecting portion.
  • the external connection terminal 16 intersects with the main plane 131 of the positive electrode connection terminal 13 or the relay member 15 (direction orthogonal in this embodiment) and intersects with the main plane 141 of the negative electrode connection terminal 14.
  • the connecting plane 161 extends in the orthogonal direction.
  • the relay member 15 is connected to the electrode terminal connection plane 162 of the external connection terminal 16 on the positive electrode side, and the negative electrode connection terminal 14 is connected to the electrode terminal connection plane 162 of the external connection terminal 16 on the negative electrode side.
  • the unit battery 10 includes a battery element 11, an outer packaging member 12 that houses the battery element 11, a thin plate-like positive electrode connection terminal 13 and a negative electrode connection terminal 14 that are led out from the outer peripheral edge of the outer packaging member 12 to face each other.
  • the length dimension of the outer packaging member 12 is 160 mm
  • the width dimension is 80 mm
  • the thickness dimension is 5 mm.
  • the length dimension, the width dimension, and the thickness dimension of the outer packaging member 12 are not limited to the above dimensions.
  • the external connection terminal 16 is made of copper or a copper alloy and has a plate-like form of 1 mm thicker than the positive electrode connection terminal 13 and the negative electrode connection terminal 14 (thickness 0.2 mm). It is formed to be smaller than 12 dimensions in the width direction.
  • the external connection terminal 16 is electrically connected to the positive electrode connection terminal 13 and the negative electrode connection terminal 14 by laser welding at a substantially central portion thereof. Then, both end portions of the external connection terminal 16 are bent in a direction substantially orthogonal to the substantially central portion, thereby connecting each plane in a direction orthogonal to the main plane of the positive connection terminal 13 and the negative connection terminal 14. 161 is formed.
  • the connecting member 20 is made of copper or a copper alloy, has a plate shape similar to that of the external connection terminal 16, and is formed to have a length dimension capable of connecting adjacent external connection terminals 16. For example, when a plurality of unit cells 10 are connected in series, the external connection terminals 16 connected to the opposite poles of the two adjacent unit cells 10 are connected. On the other hand, when a plurality of unit cells 10 are connected in parallel, the external connection terminals 16 connected to the same pole of two or more adjacent unit cells 10 are connected.
  • the connecting plane 161 of the external connection terminal 16 and the connecting member 20 each have a through hole and are firmly connected by bolts and nuts.
  • the container member 17 includes a frame member 171 and a lid member 172.
  • the frame member 171 is made of synthetic resin and has a rectangular shape in plan view.
  • An outer packaging member holding part 174 to be placed and an opening part 175 at the center part are formed.
  • the electrode terminal holding portion 173 is provided with the external connection terminal 16, and the exposed substantially central portion of the external connection terminal 16 and the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are laser-welded as described above.
  • the connection plane 161 of the external connection terminal 16 is provided so as to protrude from the electrode terminal holding portion 173 to the outside.
  • the unit battery connecting member 30 includes a bolt 31 and a nut 32, is formed in the flat portion of the electrode terminal holding portion 173, and is inserted into through holes 176 provided at the four corners of the lower frame member 171b, whereby a plurality of unit batteries are provided. 10 are connected in the stacking direction.
  • the lid member 172 is made of aluminum or an aluminum alloy, and has an upper lid member 172a and a lower lid member 172b each having a U-shaped cross section.
  • the rivets 179 are inserted into the through holes 177 and 178 on the side portions of the upper lid member 172a and the lower lid member 172b, and are caulked together.
  • the upper lid member 172a and the lower lid member 172b are fixed.
  • An insulating tape (not shown) is affixed to.
  • the aluminum upper lid member 172a and the lower lid member 172b also serve as a heat sink.
  • a gap may be provided without bringing the upper surface of the outer packet member 12 into contact with the upper lid member 172a.
  • the lower main surface of the outer packet member 12 and the lower lid member 172b are bonded with an adhesive.
  • the thickness of the electrode terminal holding portion 173 (FIG. 2) on which the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are placed is larger than the thickness of the side portion of the lid member 172, the upper lid member 172 a of the adjacent unit battery 10.
  • a gap is formed between the lower lid member 172b and the lower lid member 172b.
  • a relay member 15 is connected to the positive electrode connection terminal 13 in order to improve electrical connectivity with the external connection terminal 16.
  • the relay member 15 is joined to the positive electrode connection terminal 13 by ultrasonic welding.
  • the relay member 15 is formed with a curved portion 151 at the ultrasonic welding portion.
  • stress relaxation is possible in the case of undesired external stress or heat shock.
  • the bending portion 151 is likely to be broken first when intense stress is applied, so that the battery element 11 can be prevented from being internally short-circuited.
  • one end portion of the relay member 15 is laser welded to the external connection terminal 16 fixed to the frame member 171, so that the shape of the curved portion 151 is normally stabilized, and therefore, the stress relaxation is excellent.
  • the positive electrode connection terminal 13 and the negative electrode connection terminal 14 may be led out from the outer peripheral edge of the outer packaging member 12 in the same direction.
  • only one end portion of the external connection terminal 16 is bent in a direction substantially orthogonal to each other, and a connecting plane is formed in a direction orthogonal to the main planes 131 and 141 of the positive connection terminal 13 and the negative connection terminal 14. 161 may be formed.
  • the material of the positive electrode connection terminal 13 is not limited to aluminum or an aluminum alloy, but may be a simple substance or an alloy such as nickel, iron, or stainless steel.
  • the thickness of the positive electrode connection terminal 13 may be about 0.1 to 1.0 mm.
  • the material of the negative electrode connection terminal 14 is not limited to copper or a copper alloy, but may be a simple substance or an alloy such as nickel, aluminum, iron, and stainless steel.
  • the thickness of the negative electrode connection terminal 14 may be about 0.1 to 1.0 mm.
  • the relay member 15 is not necessarily required, and may be provided as necessary. Further, the curved portion 151 of the relay member 15 is not necessarily required, and may be provided as necessary.
  • the material of the relay member 15 is copper or a copper alloy, but is not limited thereto, and a base material made of aluminum or an aluminum alloy with Ni plating may be used. In this case, Sn plating may be performed instead of Ni plating.
  • the bending portion 151 is not limited to the positive electrode side, and may be provided on the negative electrode side. The bending portion 151 may be provided on both the positive electrode side and the negative electrode side.
  • the material of the external connection terminal 16 is not limited to copper or a copper alloy, but may be a simple substance or an alloy such as nickel, aluminum, iron, and stainless steel. Ni plating or Sn plating may be applied as necessary.
  • the thickness of the external connection terminal 16 may be about 0.2 mm to 3 mm, and may be the same thickness as the positive electrode connection terminal 13 and the negative electrode connection terminal 14.
  • the external connection terminal 16 is electrically connected to the positive electrode connection terminal 13 and the negative electrode connection terminal 14 by laser welding, but may be connected by resistance welding or the like.
  • the material of the connecting member 20 is not limited to copper or copper alloy, but may be simple substance or alloy such as nickel, aluminum, iron, and stainless steel.
  • the connecting plane 161 of the external connection terminal 16 and the connecting member 20 may be connected not only by bolts and nuts but also by rivets, studs, screws, pins, or the like.
  • the container member 17 is composed of a synthetic resin frame member 171 and an aluminum lid member 172, but a synthetic resin lid member 172 may be used.
  • the frame member 171 and the lid member 172 may be made of synthetic resin and integrated.
  • Either one of the upper lid member 172a and the lower lid member 172b may be made of aluminum.
  • the material of the lid member 172 is not limited to aluminum or an aluminum alloy, and may be a simple substance or an alloy such as nickel, aluminum, iron, and stainless steel.
  • the shapes of the upper lid member 172a and the lower lid member 172b constituting the lid member 172 are not limited to the U-shaped cross section, and either one may be U-shaped in cross section, or each may be flat.
  • the frame member 171, the upper lid member 172a, and the lower lid member 172b may be formed so as to be engaged with each other.
  • the opening 175 at the center of the frame member 171 is not always necessary, and the center may also be covered with synthetic resin.
  • the gap between the upper lid member 172a and the lower lid member 172b of the adjacent unit cells 10 is not necessarily required.
  • the unit battery connecting member 30 is not always necessary.
  • the unit cells 10 may be connected by rivets, studs, screws, pins, etc. without being connected by the bolts 31 and the nuts 32.
  • the concave and convex portions are formed in the electrode terminal holding portion 173 or the outer packaging member holding portion 174 of the frame member 171, and the adjacent unit cells 10 are stacked, the concave portions of the electrode terminal holding portion 173 or the outer packaging member holding portion 174
  • the unit cells 10 may be connected in the stacking direction by fitting the protrusions to each other.
  • the number of series / parallel numbers of the unit batteries 10 in the battery pack 1 is arbitrarily set according to the use of the battery pack 1 and the voltage of the unit battery 10.
  • the stacking direction of the unit batteries 10 is in a direction orthogonal to the mounting surface of the battery pack 1, in other words, the direction in which the main plane of the unit battery 10 is parallel to the mounting surface of the battery pack 1.
  • a plurality of unit cells 10 are stacked vertically, and the stacking direction is parallel to the mounting surface of the battery pack 1, in other words, the main plane of the unit battery 10 is the mounting surface of the battery pack 1.
  • a plurality of unit cells 10 may be horizontally stacked (standing) in a direction orthogonal to the vertical direction.
  • the battery pack 1 is provided with a protection circuit as necessary in an assembled battery in which eight unit batteries 10 configured in a 4-by-2 configuration are stacked, and the total positive terminal and the total negative terminal of the assembled battery are externally provided. Used by connecting to a terminal.
  • the battery pack 1 is used as a power source for electric / electronic devices and motors that require a large current.
  • the battery pack 1 is used for HEV (hybrid vehicle), PHEV (plug-in hybrid vehicle), EV (electric vehicle), power storage, electric tool, electric assist bicycle, electric motorcycle, UPS (uninterruptible power supply). Power supply), AGV (automatic guided vehicle), construction equipment such as a forklift, engine starter, portable power supply, portable information terminal, and the like.
  • the external connection terminals 16 of the unit cells 10 are the main plane 131 of the positive electrode connection terminals 13 and the negative electrode connection terminals 14, It is connected to the connecting member 20 by a connecting plane 161 extending in a direction intersecting with 141.
  • the connecting plane 161 of the external connection terminal 16 of each unit battery 10 can be brought into contact with the connecting member 20 by surface contact.
  • the electrical contact resistance between the unit cells 10 to be connected can be reduced, that is, the electrical connectivity between the unit cells 10 can be improved. Therefore, the current collecting resistance can be reduced in the battery pack 1.
  • the external connection terminal 16 and the connecting member 20 of each unit battery 10 can be fixed using a mechanical fixing means. For this reason, since the operation
  • the connecting member 20 connects the plurality of unit cells 10 in the thickness direction to connect them in series and / or in parallel, thereby using the connecting member 20 and the plurality of unit cells 10 at the shortest distance. Can be connected, and the current collecting resistance can be reduced.
  • the connecting member 20 connects the external connection terminal 16 with the detachable fastening member 21, so that when the unit battery 10 is erroneously connected, the connection is easily performed again. be able to.
  • the defective unit battery 10 can be easily replaced.
  • the fastening member 21 is preferably a kind selected from the group consisting of bolts / nuts, screws and pins.
  • the external connection terminal 16 has a connection plane 161 formed by bending a plate-like material.
  • the electrical contact resistance between the unit cells 10 to be connected can be further reduced, that is, the electrical connection between the unit cells 10. Connectivity can be further improved.
  • the external connection terminal 16 has a larger thickness than the positive electrode connection terminal 13 and the negative electrode connection terminal 14, so that the relatively thin positive electrode connection terminals 13 are relatively thin with each other. Rigidity can be improved rather than connecting the connection terminals 14 directly.
  • the external connection terminal 16 has two connection planes 161 arranged on both sides of the positive electrode connection terminal 13 and the negative electrode connection terminal 14, thereby The contact area with the connecting member 20 can be further increased.
  • each of the positive electrode connection terminal 13 and the negative electrode connection terminal 14 and the external connection terminal 16 are electrically connected by laser welding, so that a relatively thick positive electrode connection terminal. Even when 13 and the negative electrode connection terminal 14 are used, each of the positive electrode connection terminal 13 and the negative electrode connection terminal 14 and the external connection terminal 16 can be reliably connected.
  • the unit battery 10 includes a container member 17 that houses the outer packaging member 12, the positive electrode connection terminal 13, and the negative electrode connection terminal 14, and the external connection terminal 16 is led out from the container member 17.
  • the container member 17 includes a frame member 171 made of synthetic resin and a lid member 172 made of metal.
  • the metal lid member 172 the heat dissipation of the unit battery 10 can be improved.
  • the lid member 172 includes an upper lid member 172a and a lower lid member 172b, and the upper lid member 172a and the lower lid member 172b are configured to cover at least a part of the frame member 171 by being engaged with each other.
  • the mechanical strength of the container member 17 can be improved, and the sealing performance can also be improved.
  • the container member 17 has an insulating property
  • the outer packaging member 12 includes at least an inner surface layer made of a thermoplastic resin and a metal layer disposed outside the inner surface layer
  • the power storage element is configured to be sealed by heat welding.
  • the insulation of the battery element 11 with respect to the outside is given to the container member 17 with respect to the outer packaging member 12. It can be complemented with.
  • the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are led out from the outer peripheral edge of the outer packaging member 12 in a direction facing each other, so that the positive electrode connection terminal 13 and the negative electrode are connected in the same direction.
  • the connection terminal 14 is derived, the current collecting resistance can be reduced because the width of the terminal can be easily increased.
  • the heat dissipation is better when the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are led out in the opposite direction. Since it is high, high input / output is possible and safety can be improved.
  • the unit battery 10 includes the relay member 15 that electrically connects the positive electrode connection terminal 13 and the external connection terminal 16, so that the positive electrode connection terminal 13 and the external connection terminal are connected.
  • the electrical connectivity with the terminal 16 can be improved.
  • the curved portion 151 is formed in the connection portion between the positive electrode connection terminal 13 and the relay member 15, so that stress can be relieved when undesired external stress or heat shock is applied to the connection portion. can do. Further, in this case, since the ultrasonic welding portion is formed on the bending portion 151, the bending portion 151 is likely to be broken first when an excessive stress is applied to the bending portion 151. Can be prevented.
  • the unit battery 10 includes a flexible outer packaging member 12 that houses the battery element 11, and a positive electrode that is electrically connected to the battery element 11 and led out from the outer packaging member 12.
  • a connection terminal 13 and a negative electrode connection terminal 14, and an external connection terminal 16 electrically connected to each of the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are provided.
  • the unit battery 10 can be easily electrically connected to the external terminal by the external connection terminal 16.
  • a lithium ion secondary battery which is an example of a laminated secondary battery, encloses and seals a laminated body constituting the battery element 11, a laminated body, and a non-aqueous electrolyte (not shown).
  • a positive electrode connection terminal 13 (positive electrode tab) and a negative electrode connection terminal 14 which are connected to the laminated body via the outer packaging member 12 and the current collector of the laminated body and led out from the outer peripheral edge of the outer packaging member 12 to face each other. (Negative electrode tab).
  • the outer packaging member 12 is positioned on the inner surface side facing the laminate, and includes an inner surface layer made of a synthetic resin, an outer surface layer made of a synthetic resin positioned outside the lithium ion secondary battery, and an inner surface layer and an outer surface layer. It is formed of a single film composed of an intermediate layer made of a metal, that is, a laminate film having a three-layer structure.
  • the inner surface layer is made of polypropylene which is a heat-sealable thermoplastic resin and has a thickness of 30 to 120 ⁇ m.
  • the intermediate layer is made of an aluminum foil or an aluminum alloy foil, and has a thickness of 30 to 50 ⁇ m.
  • the outer surface layer is made of nylon (registered trademark) and has a thickness of 20 to 40 ⁇ m.
  • the outer packaging member 12 configured in this manner is a material that is easily deformed and has flexibility.
  • the laminate film may be provided with an adhesive layer such as urethane between the layers as necessary.
  • the lid member 172 serves as an outer surface layer.
  • the inner layer and the intermediate layer (metal layer) have a two-layer structure. You may comprise a laminate film.
  • the outer packaging member 12 is sealed by, for example, overlapping the edges of two laminated films and thermally welding (heat-sealing) the four sides. Note that one laminate film may be folded in half and heat-welded on three sides.
  • the positive electrode connecting terminal 13 and the negative electrode connecting terminal 14 have a rectangular shape with a relatively bendable thickness of 0.2 mm.
  • the positive electrode connecting terminal 13 is made of aluminum or an aluminum alloy and is used for negative electrode connection.
  • the terminal 14 is made of copper or a copper alloy.
  • the laminate accommodated in the outer packaging member 12 includes a plurality of strip-shaped positive electrodes, a plurality of strip-shaped negative electrodes, and a separator disposed so as to be interposed between the positive electrodes and the negative electrodes.
  • Each of the plurality of positive electrodes and each of the plurality of negative electrodes are alternately stacked with a separator interposed therebetween.
  • the separator a plurality of strip-shaped separators may be used, or one long separator may be used by folding into ninety-nine folds.
  • the electrode body may be a wound body in which a long positive electrode, a long negative electrode, and a long separator are wound in a flat shape.
  • the positive electrode is configured by forming a positive electrode mixture layer containing a positive electrode active material on both surfaces of the current collector, excluding the end on the side connected to the positive electrode connection terminal 13.
  • the negative electrode is configured by forming a negative electrode mixture layer containing a negative electrode active material on both surfaces of the current collector, except for the end portion on the side connected to the negative electrode connection terminal 14.
  • a positive electrode slurry obtained by kneading a positive electrode active material, a binder and, if necessary, a conductive additive in an organic solvent is uniformly applied on both surfaces of an aluminum foil current collector. After drying, the positive electrode mixture layer is produced on both sides of the current collector by pressing.
  • a negative electrode slurry obtained by kneading a negative electrode active material, a binder and, if necessary, a conductive additive in an organic solvent is uniformly applied on both sides of a current collector made of copper foil. After drying, the negative electrode mixture layer is produced on both sides of the current collector by pressing.
  • binder contained in the positive electrode mixture layer and the negative electrode mixture layer a known binder that is usually used in the positive electrode mixture and the negative electrode mixture of a lithium ion secondary battery can be used. Furthermore, well-known additives, such as a conductive support agent and an oxide, can be added to a positive mix layer and a negative mix layer.
  • a metal sulfide or oxide such as TiS 2 , MoS 2 , NbSe 2 , V 2 O 5 can be used as the positive electrode active material.
  • LiM x O 2 as a positive electrode active material of a lithium ion secondary battery (wherein M represents one or more transition metals, x is different depending on the charge / discharge state of the battery, and is usually 0.05 or more and 1.10 or less.
  • an olivine-based material such as LiFePO 4 may be used.
  • These lithium composite oxides can generate a high voltage and become a positive electrode active material having an excellent energy density.
  • a plurality of these positive electrode active materials may be used in combination.
  • carbon materials such as non-graphitizable carbon materials and graphite materials can be used.
  • carbon materials such as pyrolytic carbons, cokes, graphites, glassy carbon fibers, organic polymer compound fired bodies, carbon fibers, and activated carbon can be used.
  • the cokes include pitch coke, needle coke, and petroleum coke.
  • said organic polymer compound fired body means what carbonized by baking a phenol resin, furan resin, etc. at a suitable temperature.
  • materials that can be doped and dedoped with lithium include polymers such as polyacetylene and polypyrrole, Sn oxides such as SnO 2 , Sn and Si alloys such as Sn 5 Cu 6 and SiMg 2 It is also possible to use a ceramic oxide such as Li 4 Ti 5 O 12 (lithium titanate). In order to produce a negative electrode, a plurality of these negative electrode active materials may be used in combination.
  • the separator is not particularly limited, and conventionally known separators such as polyolefins such as polypropylene and polyethylene, and nonwoven fabrics such as cellulose, polyethylene terephthalate, and natural fiber pulp can be used.
  • the separator is not limited by its name, and a solid electrolyte or gel electrolyte having a function (role) as a separator may be used instead of the separator.
  • a separator containing an inorganic material such as alumina or zirconia may be used.
  • One separator may be interposed between the positive electrode and the negative electrode, or a plurality of separators may be interposed. The material of the plurality of separators may be the same or different.
  • the nonaqueous electrolytic solution is prepared by dissolving an electrolyte in a nonaqueous solvent.
  • the electrolyte for example, a solution obtained by dissolving LiPF 6 in a nonaqueous solvent at a concentration of 1.0 mol / L is used.
  • an electrolyte other than LiPF 6 lithium salts such as LiBF 4 , LiAsF 6 , LiClO 4 , LiCF 3 SO 3 , LiN (SO 2 CF 3 ) 2 , LiC (SO 2 CF 3 ) 3 , LiAlCl 4 , LiSiF 6 are used. Can be mentioned.
  • LiPF 6 or LiBF 4 is used as the electrolyte.
  • Such an electrolyte is preferably used by being dissolved in a non-aqueous solvent at a concentration of 0.1 mol / L to 3.0 mol / L, and is preferably dissolved at a concentration of 0.5 mol / L to 2.0 mol / L. More preferably, it is used.
  • the non-aqueous solvent for example, a mixture of propylene carbonate, ethylene carbonate and diethyl carbonate in a volume ratio of 5 to 20:20 to 30:60 to 70 is used.
  • non-aqueous solvents include: cyclic carbonates such as propylene carbonate and ethylene carbonate; chain carbonates such as diethyl carbonate and dimethyl carbonate; carboxylic acid esters such as methyl propionate and methyl butyrate; ⁇ -butyllactone, sulfolane, Ethers such as 2-methyltetrahydrofuran and dimethoxyethane can be used.
  • These non-aqueous solvents may be used alone or in combination of two or more. Among these, it is preferable from the point of oxidation stability to use carbonate ester as a non-aqueous solvent. Moreover, you may add various additives to a non-aqueous electrolyte as needed.
  • the electricity storage device assembly structure of the present invention it is possible to reduce the current collecting resistance and easily connect the electricity storage devices. Moreover, according to the electricity storage device unit structure of the present invention, the electricity storage device can be easily electrically connected to the external terminal by the external connection terminal. Therefore, the present invention uses a flexible outer packaging member for power storage elements such as a lithium ion secondary battery, a lithium secondary battery, a polymer secondary battery, an organic radical battery, an all-solid battery, and an electric double layer capacitor. This is useful for electrically connecting a plurality of power storage devices to be accommodated.
  • power storage elements such as a lithium ion secondary battery, a lithium secondary battery, a polymer secondary battery, an organic radical battery, an all-solid battery, and an electric double layer capacitor. This is useful for electrically connecting a plurality of power storage devices to be accommodated.

Abstract

Provided are an electric storage device unit structure comprising a flexible outer packing member that holds an electric storage element, a positive electrode connection terminal and a negative electrode connection terminal which are connected to the electric storage element and led out to the outside from the outer packing member, and an external connection terminal connected to said terminals, and an electric storage device assembly structure configured by connecting a plurality of electric storage device unit structures. Conventional electric storage device assembly structures have problems including the high contact resistance between electric storage device unit structures, increased electric collection resistance in the assembly structure, and a complicated operation when electric storage device unit structures are connected to each other. In order to solve the above problems, disclosed is a battery pack (1) provided with a plurality of unit batteries (10), and a coupling member (20) for electrically coupling the plurality of unit batteries, wherein an external connection terminal (16) has a coupling plane extending in the direction crossing principal planes of a positive electrode connection terminal and a negative electrode connection terminal and is coupled to the coupling member by the coupling plane.

Description

蓄電デバイス組立構造体と蓄電デバイス単位構造体Storage device assembly structure and storage device unit structure
　本発明は、一般的には蓄電デバイス単位構造体と蓄電デバイス組立構造体に関し、特定的には、リチウムイオン二次電池、リチウム二次電池、ポリマー二次電池、有機ラジカル電池、全固体電池、電気二重層キャパシタなどの蓄電要素を、可撓性を有する外包部材を用いて収容する蓄電デバイスを複数個、電気的に接続して構成される蓄電デバイス組立構造体とその蓄電デバイス組立構造体を構成する個々の蓄電デバイス単位構造体に関するものである。 The present invention generally relates to an electricity storage device unit structure and an electricity storage device assembly structure, and specifically, a lithium ion secondary battery, a lithium secondary battery, a polymer secondary battery, an organic radical battery, an all-solid battery, A power storage device assembly structure configured by electrically connecting a plurality of power storage devices that house a power storage element such as an electric double layer capacitor using a flexible outer packaging member, and the power storage device assembly structure The present invention relates to individual power storage device unit structures.
　従来から、たとえば、リチウムイオン二次電池等の蓄電デバイスに関しては、携帯用電話機、ノートパソコン、デジタルカメラ等の携帯用電子機器の電源や、近年では自動車その他のモータの電力原に用いられることに伴って、小型化、軽量化、薄型化等の要求が高まっている。また、電源用途としては、電子機器やモータの使用態様や使用条件の多様化に伴って、蓄電デバイスの大容量化が求められている。この大容量化の一つの手段として、複数個の蓄電デバイスを直列および／または並列に接続して組み合わせてユニット化した蓄電デバイス組立構造体が知られている。 Conventionally, for example, regarding an electricity storage device such as a lithium ion secondary battery, it is used as a power source for portable electronic devices such as portable telephones, notebook computers and digital cameras, and in recent years as a power source for automobiles and other motors. Along with this, there are increasing demands for downsizing, weight reduction, and thickness reduction. In addition, as power supply applications, it is required to increase the capacity of power storage devices in accordance with the diversification of usage modes and usage conditions of electronic devices and motors. As one means for increasing the capacity, a power storage device assembly structure is known in which a plurality of power storage devices are connected in series and / or in parallel to form a unit.
　このような蓄電デバイス組立構造体の一例であるセルモジュールが、特許第３９１２２０１号公報（以下、特許文献１という）に開示されている。特許文献１の図１、図２および図４に示すように、このセルモジュールでは、シート状の正極端子１ｂおよび負極端子１ｃを有する複数の両タブ型セルを直列に配置し、同一極側の各端子を、端子伸延方向に各々配設された略板状のバスバー２Ａ、２Ｂに接続することにより、一つのセルユニットを構成する。このセルユニットを極性の異なるバスバー２Ａ、２Ｂ同士が対向するように複数積層配設することにより、セルモジュールを構成する。セルモジュールは、各セルユニットのバスバー２Ａ、２Ｂに形成された、セルユニットの積層方向に貫通する貫通孔と、積層方向に並んだ複数のバスバー２Ａ、２Ｂの貫通孔を貫通して、バスバー２Ａ、２Ｂを積層方向に直交する方向に対して所定位置に位置決めする位置決め部材としてのロッド３Ａ、３Ｂ、３Ｃとを備える。位置決め部材は、積層方向に隣接した同電位に設定されるバスバー２Ａ、２Ｂ同士を電気的に接続する導電性柱状部材としてのロッド３Ａと、積層方向に隣接した異なる電位に設定されるバスバー同士を電気的に絶縁する絶縁性柱状部材としてのロッド３Ｂ、３Ｃとを積層方向に交互に接続して形成されている。複数のセルユニットは、導電性柱状部材としてのロッド３Ａによって直列に接続されている。なお、特許文献１に開示されたセルモジュールでは、各セルユニットのバスバー２Ａ、２Ｂは、溶接により、ロッド３Ａに固定されている。 A cell module which is an example of such a power storage device assembly structure is disclosed in Japanese Patent No. 3912201 (hereinafter referred to as Patent Document 1). As shown in FIG. 1, FIG. 2, and FIG. 4 of Patent Document 1, in this cell module, a plurality of both tab-type cells having a sheet-like positive electrode terminal 1b and a negative electrode terminal 1c are arranged in series, By connecting each terminal to the substantially plate-like bus bars 2A and 2B respectively arranged in the terminal extending direction, one cell unit is configured. A plurality of the cell units are stacked and disposed so that the bus bars 2A and 2B having different polarities face each other, thereby forming a cell module. The cell module passes through through holes formed in the bus bars 2A and 2B of each cell unit and penetrating in the stacking direction of the cell units and through holes of the plurality of bus bars 2A and 2B arranged in the stacking direction. Rods 3A, 3B, and 3C as positioning members for positioning 2B at a predetermined position with respect to a direction orthogonal to the stacking direction. The positioning member includes a rod 3A as a conductive columnar member that electrically connects bus bars 2A and 2B set at the same potential adjacent in the stacking direction, and bus bars set at different potentials adjacent in the stacking direction. It is formed by alternately connecting rods 3B and 3C as insulating columnar members that are electrically insulated in the stacking direction. The plurality of cell units are connected in series by a rod 3A as a conductive columnar member. In the cell module disclosed in Patent Document 1, the bus bars 2A and 2B of each cell unit are fixed to the rod 3A by welding.
　また、特開２００６－１９０７５号公報（以下、特許文献２という）には、蓄電デバイス組立構造体の一例として、扁平型電池をその厚み方向に積層してなる組電池が開示されている。扁平型電池においては、扁平型電池の本体からその長さ方向に引き出されている電極タブには、当該長さ方向に対して交差する幅方向に伸延し長さ方向に沿う折り曲げ線から当該扁平型電池の厚み方向に折り曲げることができ、隣接する扁平型電池の電極タブと接合される折曲接合部が設けられている。組電池においては、積層方向に隣接する扁平型電池同士は、それぞれの折曲接合部同士が接合されることによって電気的に接続されている。なお、折曲接合部同士は、超音波溶着によって接合されている。 In addition, JP 2006-19075 A (hereinafter referred to as Patent Document 2) discloses an assembled battery in which flat batteries are stacked in the thickness direction as an example of a power storage device assembly structure. In a flat battery, an electrode tab drawn out in the length direction from the main body of the flat battery is extended in a width direction intersecting the length direction and is bent from a fold line along the length direction. A bent joint that can be folded in the thickness direction of the battery and is joined to an electrode tab of an adjacent flat battery is provided. In an assembled battery, flat batteries that are adjacent in the stacking direction are electrically connected to each other by joining their bent joints. Note that the bent joints are joined by ultrasonic welding.
特許第３９１２２０１号公報Japanese Patent No. 3912201 特開２００６－１９０７５号公報JP 2006-19075 A
　特許文献１に開示された蓄電デバイス組立構造体としてのセルモジュールでは、各セルユニットの略板状のバスバー２Ａ、２Ｂ同士を電気的に接続するために導電性柱状部材としてのロッド３Ａが用いられている。バスバー２Ａ、２Ｂは、溶接により、ロッド３Ａに固定されている。これにより、各セルユニットの略板状のバスバー２Ａとバスバー２Ｂとが柱状のロッド３Ａを介して電気的に接続されている。このため、接続されるセルユニット間の電気的な接触抵抗が高くなる。したがって、組電池としてのセルモジュールにおいて集電抵抗が大きいという問題がある。 In the cell module as the power storage device assembly structure disclosed in Patent Document 1, the rod 3A as a conductive columnar member is used to electrically connect the substantially plate-shaped bus bars 2A and 2B of each cell unit. ing. The bus bars 2A and 2B are fixed to the rod 3A by welding. Thereby, the substantially plate-like bus bar 2A and the bus bar 2B of each cell unit are electrically connected via the columnar rod 3A. For this reason, the electrical contact resistance between the connected cell units becomes high. Therefore, there is a problem that current collection resistance is large in the cell module as an assembled battery.
　また、特許文献２に開示された蓄電デバイス組立構造体としての組電池では、扁平型電池同士を電気的に接続するために、各扁平型電池において電極タブを折り曲げることにより、折曲接合部が形成されている。積層方向に隣接する扁平型電池同士は、それぞれの折曲接合部同士が超音波溶着によって接合されることによって電気的に接続されている。このため、扁平型電池同士を接続するための作業が煩雑であり、作業性が悪いので、接続作業が困難である。また、各扁平型電池の電極タブの折曲接合部同士が超音波溶着されているので、扁平型電池を誤って接続した場合に接続のやり直しをすることができないという問題がある。さらに、各扁平型電池の電極タブの折曲接合部同士が超音波溶着されているので、電池を１個ずつ重ねて接続作業をする必要がある。このため、組電池を構成する電池を必要個数だけ重ねて一度に接続することが困難である。 Moreover, in the assembled battery as an electrical storage device assembly structure disclosed in Patent Document 2, in order to electrically connect the flat batteries to each other, by bending the electrode tab in each flat battery, the bent joint portion is formed. Is formed. The flat batteries that are adjacent to each other in the stacking direction are electrically connected to each other by joining the respective bent joints by ultrasonic welding. For this reason, the operation | work for connecting flat type | mold batteries is complicated, and workability | operativity is bad, Therefore Connection work is difficult. In addition, since the bent joints of the electrode tabs of each flat battery are ultrasonically welded together, there is a problem that the connection cannot be redone if the flat battery is connected by mistake. Further, since the bent joints of the electrode tabs of each flat battery are ultrasonically welded, it is necessary to perform connection work by stacking the batteries one by one. For this reason, it is difficult to connect a necessary number of batteries constituting the assembled battery at once.
　そこで、本発明の目的は、集電抵抗を低減させることができるとともに、蓄電デバイス同士の接続を容易に行うことが可能な蓄電デバイス組立構造体とその蓄電デバイス組立構造体を構成する個々の蓄電デバイス単位構造体を提供することである。 Accordingly, an object of the present invention is to provide a power storage device assembly structure capable of reducing current collection resistance and easily connecting power storage devices, and each power storage constituting the power storage device assembly structure. A device unit structure is provided.
　本発明に従った蓄電デバイス組立構造体は、複数の蓄電デバイスを電気的に接続して構成される蓄電デバイス組立構造体であって、複数の蓄電デバイス単位構造体と、複数の蓄電デバイス単位構造体を電気的に連結する連結部材とを備える。蓄電デバイス単位構造体が、蓄電要素を収容する可撓性の外包部材と、蓄電要素に電気的に接続されて外包部材から外側に導出された正極接続用端子および負極接続用端子と、正極接続用端子および負極接続用端子のそれぞれに電気的に接続された外部接続用端子とを含む。外部接続用端子が、正極接続用端子および負極接続用端子の主平面と交差する方向に延在する連結平面を有し、かつ、外部接続用端子の連結平面にて連結部材と連結される。 An electrical storage device assembly structure according to the present invention is an electrical storage device assembly structure configured by electrically connecting a plurality of electrical storage devices, and includes a plurality of electrical storage device unit structures and a plurality of electrical storage device unit structures And a connecting member for electrically connecting the body. A power storage device unit structure includes a flexible outer packaging member that houses a power storage element, a positive electrode connection terminal and a negative electrode connection terminal that are electrically connected to the power storage element and led out from the outer packaging member, and a positive electrode connection And an external connection terminal electrically connected to each of the negative electrode connection terminal and the negative electrode connection terminal. The external connection terminal has a connection plane extending in a direction intersecting with the main planes of the positive connection terminal and the negative connection terminal, and is connected to the connection member at the connection plane of the external connection terminal.
　本発明の蓄電デバイス組立構造体では、複数の蓄電デバイスを電気的に接続するために、各蓄電デバイス単位構造体の外部接続用端子が、正極接続用端子および負極接続用端子の主平面と交差する方向に延在する連結平面にて連結部材に連結される。このため、各蓄電デバイス単位構造体の外部接続用端子の連結平面を面接触により連結部材に接触させることができる。これにより、接続される蓄電デバイス間の電気的な接触抵抗を低減させることができ、すなわち、蓄電デバイス間の電気的接続性を向上させることができる。したがって、蓄電デバイス組立構造体において集電抵抗を低減させることが可能になる。 In the electricity storage device assembly structure of the present invention, in order to electrically connect a plurality of electricity storage devices, the external connection terminal of each electricity storage device unit structure intersects the main plane of the positive electrode connection terminal and the negative electrode connection terminal. It connects with a connection member in the connection plane extended in the direction to do. For this reason, the connection plane of the external connection terminal of each power storage device unit structure can be brought into contact with the connection member by surface contact. Thereby, the electrical contact resistance between the electrical storage devices connected can be reduced, ie, the electrical connectivity between electrical storage devices can be improved. Therefore, it is possible to reduce the current collection resistance in the power storage device assembly structure.
　また、本発明の蓄電デバイス組立構造体では、各蓄電デバイス単位構造体の外部接続用端子と連結部材とを、機械的固定手段を用いて固着させることができる。このため、蓄電デバイス単位構造体同士を接続するための作業を容易に行うことができるので、作業性が良好である。また、各蓄電デバイス単位構造体の外部接続用端子と連結部材とを、機械的固定手段を用いて固着させることができるので、蓄電デバイス単位構造体を誤って接続した場合に接続のやり直しをすることができる。さらに、各蓄電デバイス単位構造体の外部接続用端子と連結部材とを、機械的固定手段を用いて固着させることができるので、蓄電デバイス組立構造体を構成する蓄電デバイス単位構造体を必要個数だけ重ねて一度に接続することができる。 Further, in the electricity storage device assembly structure of the present invention, the external connection terminal and the connecting member of each electricity storage device unit structure can be fixed using a mechanical fixing means. For this reason, since the operation | work for connecting electrical storage device unit structures can be performed easily, workability | operativity is favorable. In addition, since the external connection terminal and the connecting member of each power storage device unit structure can be fixed using a mechanical fixing means, the connection is re-executed when the power storage device unit structure is connected by mistake. be able to. Furthermore, since the external connection terminal and the connecting member of each power storage device unit structure can be fixed using mechanical fixing means, only the required number of power storage device unit structures constituting the power storage device assembly structure can be obtained. You can connect them all at once.
　本発明の蓄電デバイス組立構造体において、連結部材が、複数の蓄電デバイス単位構造体を厚み方向に積み重ねることにより直列および／または並列に連結することが好ましい。 In the electricity storage device assembly structure of the present invention, the connecting member is preferably connected in series and / or in parallel by stacking a plurality of energy storage device unit structures in the thickness direction.
　このように構成することにより、連結部材を用いて最短距離で複数の蓄電デバイス単位構造体を連結することができ、集電抵抗を低減させることが可能となる。 With this configuration, a plurality of power storage device unit structures can be connected at the shortest distance using a connecting member, and the current collection resistance can be reduced.
　また、本発明の蓄電デバイス組立構造体において、連結部材が、取り外し可能な固定手段で外部接続用端子を連結することが好ましい。 Moreover, in the electricity storage device assembly structure of the present invention, it is preferable that the connecting member connects the external connection terminals with a detachable fixing means.
　このように構成することにより、蓄電デバイス単位構造体を誤って接続した場合に接続のやり直しを容易に行うことができる。また、蓄電デバイス組立構造体において、不良の蓄電デバイス単位構造体を容易に交換することができる。 By configuring in this way, reconnection can be easily performed when the power storage device unit structure is erroneously connected. Further, in the power storage device assembly structure, a defective power storage device unit structure can be easily replaced.
　上記の場合、固定手段が、ボルト・ナット、ネジおよびピンからなる群より選ばれた一種であることが好ましい。 In the above case, the fixing means is preferably one type selected from the group consisting of bolts / nuts, screws and pins.
　さらに、本発明の蓄電デバイス組立構造体において、外部接続用端子が、板状材を折り曲げることにより形成された連結平面を有することが好ましい。 Furthermore, in the electricity storage device assembly structure of the present invention, it is preferable that the external connection terminal has a connecting plane formed by bending a plate-like material.
　このように一体の板状材から外部接続用端子を形成することにより、接続される蓄電デバイス間の電気的な接触抵抗をさらに低減させることができ、すなわち、蓄電デバイス間の電気的接続性をより向上させることができる。 By forming the external connection terminal from the integral plate-like material in this way, it is possible to further reduce the electrical contact resistance between the connected electricity storage devices, that is, the electrical connectivity between the electricity storage devices. It can be improved further.
　本発明の蓄電デバイス組立構造体において、外部接続用端子が、正極接続用端子および負極接続用端子よりも大きい厚みを有することが好ましい。 In the electricity storage device assembly structure of the present invention, it is preferable that the external connection terminal has a larger thickness than the positive electrode connection terminal and the negative electrode connection terminal.
　このように構成することにより、比較的薄い正極用接続用端子同士、負極接続用端子同士を直接接続するよりも剛性を向上させることができる。 With this configuration, the rigidity can be improved as compared with the case where the relatively thin positive electrode connection terminals and the negative electrode connection terminals are directly connected to each other.
　本発明の蓄電デバイス組立構造体において、外部接続用端子が、正極接続用端子および負極接続用端子のそれぞれの両側に配置された連結平面を有することが好ましい。 In the electricity storage device assembly structure of the present invention, it is preferable that the external connection terminals have connection planes disposed on both sides of the positive electrode connection terminal and the negative electrode connection terminal.
　このように構成することにより、外部接続用端子と連結部材との接触面積をより大きくすることができる。 By configuring in this way, the contact area between the external connection terminal and the connecting member can be further increased.
　本発明の蓄電デバイス組立構造体において、正極接続用端子および負極接続用端子のそれぞれと外部接続用端子とは、レーザー溶接によって電気的に接続されていることが好ましい。 In the electricity storage device assembly structure of the present invention, it is preferable that each of the positive electrode connection terminal and the negative electrode connection terminal and the external connection terminal are electrically connected by laser welding.
　このように構成することにより、厚い正極接続用端子と負極接続用端子を用いた場合でも、正極接続用端子および負極接続用端子のそれぞれと外部接続用端子とを確実に接続することができる。 With this configuration, even when a thick positive electrode connection terminal and negative electrode connection terminal are used, each of the positive electrode connection terminal and the negative electrode connection terminal can be reliably connected to the external connection terminal.
　本発明の蓄電デバイス組立構造体において、蓄電デバイス単位構造体が、外包部材と正極接続用端子および負極接続用端子を収容する容器部材を含み、外部接続用端子が容器部材から外側に導出されていることが好ましい。 In the electricity storage device assembly structure of the present invention, the electricity storage device unit structure includes a container member that houses the outer packaging member, the positive electrode connection terminal, and the negative electrode connection terminal, and the external connection terminal is led out from the container member. Preferably it is.
　このように構成することにより、蓄電要素を収容する外包部材と正極接続用端子および負極接続用端子をより強固に保持することができるとともに、外部接続用端子を蓄電デバイス単位構造体ごとに支持することができる。 By comprising in this way, while being able to hold | maintain the outer packaging member which accommodates an electrical storage element, the positive electrode connection terminal, and the negative electrode connection terminal more firmly, the external connection terminal is supported for every electrical storage device unit structure. be able to.
　上記の場合、容器部材が、合成樹脂製のフレーム部材と、金属製の蓋部材とを含むことが好ましい。 In the above case, the container member preferably includes a synthetic resin frame member and a metal lid member.
　このように金属製の蓋部材を用いることにより、蓄電デバイス単位構造体の放熱性を向上させることができる。 Thus, by using a metal lid member, the heat dissipation of the electricity storage device unit structure can be improved.
　上記の場合、蓋部材が上蓋部材と下蓋部材とを含み、上蓋部材と下蓋部材とが互いに係合することによりフレーム部材の少なくとも一部を覆うように構成されていることが好ましい。 In the above case, it is preferable that the lid member includes an upper lid member and a lower lid member, and the upper lid member and the lower lid member engage with each other to cover at least a part of the frame member.
　このように構成することにより、容器部材の機械的強度を向上させることができ、シール性も向上させることができる。 By configuring in this way, the mechanical strength of the container member can be improved, and the sealing performance can also be improved.
　本発明の蓄電デバイス組立構造体において、上記の容器部材が絶縁性を有し、外包部材が、少なくとも熱可塑性樹脂からなる内面層と、内面層の外側に配置される金属層とを含み、内面層を熱溶着することにより蓄電要素が封止されるように構成されていることが好ましい。このとき、正極接続用端子および負極接続用端子が熱溶着された内面層から外側に導出されていることが好ましい。 In the electricity storage device assembly structure of the present invention, the container member has an insulating property, and the outer packaging member includes an inner surface layer made of at least a thermoplastic resin, and a metal layer disposed on the outer side of the inner surface layer. It is preferable that the power storage element is sealed by thermally welding the layers. At this time, it is preferable that the positive electrode connection terminal and the negative electrode connection terminal are led out to the outside from the heat-welded inner surface layer.
　このように構成することにより、蓄電要素の外部に対する絶縁性を、外包部材に対して容器部材で補完することができる。 Structuring in this way makes it possible to supplement the outer insulation of the electricity storage element with the container member with respect to the outer packaging member.
　本発明の蓄電デバイス組立構造体において、正極接続用端子および負極接続用端子が、外包部材の外周縁から互いに対向する方向に導出されていることが好ましい。 In the electricity storage device assembly structure of the present invention, it is preferable that the positive electrode connecting terminal and the negative electrode connecting terminal are led out from the outer peripheral edge of the outer packaging member in a direction facing each other.
　このように構成することにより、同一方向に正極接続用端子と負極接続用端子が導出される場合に比べて、端子の幅を大きくしやすいため、集電抵抗を小さくすることができる。また、同一方向に正極接続用端子と負極接続用端子が導出される場合に比べて、互いに対向する方向に正極接続用端子と負極接続用端子が導出される方が放熱性が高いため、高入出力が可能で安全性を高めることができる。 By configuring in this way, it is easy to increase the width of the terminal compared to the case where the positive electrode connecting terminal and the negative electrode connecting terminal are led out in the same direction, so that the current collecting resistance can be reduced. In addition, compared to the case where the positive electrode connecting terminal and the negative electrode connecting terminal are led out in the same direction, the heat dissipation is higher when the positive electrode connecting terminal and the negative electrode connecting terminal are led out in the opposite direction. Input / output is possible and safety can be improved.
　本発明の蓄電デバイス組立構造体において、蓄電デバイス単位構造体が、正極接続用端子と外部接続用端子との間を電気的に接続する中継部材を含むことが好ましい。 In the power storage device assembly structure of the present invention, it is preferable that the power storage device unit structure includes a relay member that electrically connects the positive electrode connection terminal and the external connection terminal.
　このように構成することにより、正極接続用端子と外部接続用端子との電気的接続性を向上させることができる。 By configuring in this way, the electrical connectivity between the positive connection terminal and the external connection terminal can be improved.
　上記の場合、正極接続用端子と中継部材との接続部分には湾曲部が形成されていることが好ましい。 In the above case, it is preferable that a curved portion is formed at the connection portion between the positive electrode connection terminal and the relay member.
　このように構成することにより、不所望な外部応力やヒートショックなどが接続部分に加えられた場合に応力を緩和することができる。 This configuration can relieve stress when undesired external stress, heat shock, or the like is applied to the connection portion.
　上記の場合、湾曲部に超音波溶着部が形成されていることが好ましい。 In the above case, it is preferable that an ultrasonic weld is formed in the curved portion.
　このように構成することにより、湾曲部に過大な応力が加えられた場合に湾曲部が先に破断されやすいため、蓄電デバイスが内部短絡してしまうのを防止することができる。 With this configuration, when an excessive stress is applied to the bending portion, the bending portion is easily broken first, so that it is possible to prevent the electric storage device from being internally short-circuited.
　本発明に従った蓄電デバイス単位構造体は、蓄電要素を収容する可撓性の外包部材と、蓄電要素に電気的に接続されて外包部材から外側に導出された正極接続用端子および負極接続用端子と、正極接続用端子および負極接続用端子のそれぞれに電気的に接続された外部接続用端子とを備える。外部接続用端子が、正極接続用端子および負極接続用端子の主平面と交差する方向に延在し、かつ、外部端子と電気的に接続される接続平面を有する。 A power storage device unit structure according to the present invention includes a flexible outer packaging member that houses a power storage element, and a positive electrode connection terminal and a negative electrode connection that are electrically connected to the power storage element and led out from the outer packaging member. A terminal and an external connection terminal electrically connected to each of the positive electrode connection terminal and the negative electrode connection terminal. The external connection terminal has a connection plane extending in a direction intersecting with the main plane of the positive electrode connection terminal and the negative electrode connection terminal and electrically connected to the external terminal.
　本発明の蓄電デバイス単位構造体では、外部接続用端子によって蓄電デバイスを外部端子と電気的に容易に接続することができる。 In the electricity storage device unit structure of the present invention, the electricity storage device can be easily electrically connected to the external terminal by the external connection terminal.
　本発明の蓄電デバイス組立構造体によれば、集電抵抗を低減させることができるとともに、蓄電デバイス同士の接続を容易に行うことが可能になる。また、本発明の蓄電デバイス単位構造体によれば、外部接続用端子によって蓄電デバイスを外部端子と電気的に容易に接続することが可能になる。 According to the electricity storage device assembly structure of the present invention, it is possible to reduce the current collecting resistance and easily connect the electricity storage devices. Moreover, according to the electricity storage device unit structure of the present invention, the electricity storage device can be easily electrically connected to the external terminal by the external connection terminal.
本発明の蓄電デバイス組立構造体の一つの実施の形態である電池パックを示す側面図である。It is a side view which shows the battery pack which is one embodiment of the electrical storage device assembly structure of this invention. 本発明の蓄電デバイス単位構造体の一つの実施の形態として、図１の電池パックを構成する一つの単位電池を示す側面図である。It is a side view which shows one unit battery which comprises the battery pack of FIG. 1 as one Embodiment of the electrical storage device unit structure of this invention. 図２の単位電池を分解して示す分解斜視図である。It is a disassembled perspective view which decomposes | disassembles and shows the unit battery of FIG. 図２の単位電池を構成する一つの部材として、下フレーム部材と下蓋部材と外部接続用端子が一体化された部材を示す平面図である。It is a top view which shows the member by which the lower frame member, the lower cover member, and the external connection terminal were integrated as one member which comprises the unit battery of FIG. 図４の部材を分解して示す分解斜視図である。It is a disassembled perspective view which decomposes | disassembles and shows the member of FIG. 図３に示す単位電池において、外包部材と正極接続用端子および負極接続用端子と外部接続用端子との接続状態を示す部分断面図である。FIG. 4 is a partial cross-sectional view illustrating a connection state between an outer packaging member, a positive electrode connection terminal, a negative electrode connection terminal, and an external connection terminal in the unit battery illustrated in FIG. 3.
　以下、本発明の一つの実施の形態を図面に基づいて説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
　図１に示すように、本発明の蓄電デバイス組立構造体の一つの実施の形態である電池パック１は、蓄電デバイス単位構造体の一つの実施の形態である単位電池（ラミネート型二次電池）１０を、たとえば８個積み重ねて相互に電気的に接続して構成される。図１にて上段に位置する４個の単位電池１０が連結部材２０によって直列に接続されること（４直）により１組の電池群が構成され、下段に位置する４個の単位電池１０が連結部材２０によって直列に接続されること（４直）により別の１組の電池群が構成されている。そして、これら２組の電池群が連結部材２０によって並列に接続されること（２並）により組電池としての電池パック１が構成されている。電池パック１の最上段と最下段に位置する単位電池１０が外部正極端子に接続され、電池パック１の中央部に位置する２個の単位電池１０が外部負極端子に接続されている。積み重ねられた８個の単位電池１０は、単位電池連結部材３０として、たとえば、ボルト３１とナット３２を用いて固定される。このようにして、８個の単位電池１０を単位電池１０の厚み方向に積層することによって、４直２並の直列および並列に連結された単位電池１０からなる電池パック１が完成する。 As shown in FIG. 1, a battery pack 1 which is one embodiment of the electricity storage device assembly structure of the present invention is a unit battery (laminated secondary battery) which is one embodiment of the electricity storage device unit structure. For example, eight 10 are stacked and electrically connected to each other. In FIG. 1, four unit cells 10 located in the upper stage are connected in series by the connecting member 20 (four straight lines) to form a set of battery groups, and the four unit batteries 10 located in the lower stage Another set of battery groups is configured by being connected in series by the connecting member 20 (4 series). And the battery pack 1 as an assembled battery is comprised by these two sets of battery groups being connected in parallel by the connection member 20 (2 parallel). The unit batteries 10 positioned at the uppermost and lowermost stages of the battery pack 1 are connected to the external positive terminal, and the two unit batteries 10 positioned at the center of the battery pack 1 are connected to the external negative terminal. The eight unit batteries 10 stacked are fixed as the unit battery connecting member 30 using, for example, bolts 31 and nuts 32. In this way, by stacking the eight unit batteries 10 in the thickness direction of the unit battery 10, the battery pack 1 including the unit batteries 10 connected in series and parallel in four series and two parallels is completed.
　図１と図２に示すように、各単位電池１０の両端部には、正極接続用端子（図示せず）および負極接続用端子（図示せず）のそれぞれに電気的に接続された外部接続用端子１６が設けられている。各外部接続用端子１６の連結平面１６１には貫通孔１６３が形成されている。各連結部材２０に形成された貫通孔と、各外部接続用端子１６の貫通孔１６３とに通じるように締結部材２１を挿入して締結することにより、各連結部材２０が各外部接続用端子１６に固定される。取り外し可能な固定手段である締結部材２１としては、ボルト（ナット）、ネジ、ピン等が挙げられる。 As shown in FIGS. 1 and 2, external connection electrically connected to each of a positive electrode connection terminal (not shown) and a negative electrode connection terminal (not shown) is provided at both ends of each unit battery 10. A terminal 16 is provided. A through hole 163 is formed in the connecting plane 161 of each external connection terminal 16. By inserting and fastening the fastening member 21 so as to communicate with the through hole formed in each connection member 20 and the through hole 163 of each external connection terminal 16, each connection member 20 is connected to each external connection terminal 16. Fixed to. Examples of the fastening member 21 that is a detachable fixing means include bolts (nuts), screws, pins, and the like.
　図２に示すように、単位電池１０は容器部材１７を備える。容器部材１７は合成樹脂製のフレーム部材１７１と金属製の蓋部材１７２とから構成される。容器部材１７は、後述するが、外包部材と正極接続用端子および負極接続用端子とを収容する。外部接続用端子１６が、容器部材１７の両端部から外側に導出されている。 As shown in FIG. 2, the unit battery 10 includes a container member 17. The container member 17 includes a frame member 171 made of synthetic resin and a lid member 172 made of metal. As will be described later, the container member 17 accommodates an outer packaging member, a positive electrode connection terminal, and a negative electrode connection terminal. External connection terminals 16 are led out from both ends of the container member 17 to the outside.
　図３に示すように、単位電池１０は、下フレーム部材１７１ｂと下蓋部材１７２ｂと外部接続用端子１６が一体化された部材の上に、可撓性の外包部材１２が載置される。外包部材１２が蓄電要素としての電池要素１１を収容している。正極接続用端子１３（正極タブ）および負極接続用端子１４（負極タブ）が、電池要素１１に電気的に接続されて外包部材１２から外側に導出されている。正極接続用端子１３には中継部材１５が電気的に接続されている。このように構成された外包部材１２の上に、開口部（空間部）１７５を有する上フレーム部材１７１ａが被せられる。そして、上蓋部材１７２ａが上フレーム部材１７１ａの上に被せられる。フレーム部材１７１（図２）は、上フレーム部材１７１ａと下フレーム部材１７１ｂとから構成される。蓋部材１７２（図２）は、上蓋部材１７２ａと下蓋部材１７２ｂとから構成される。上蓋部材１７２ａと下蓋部材１７２ｂとを互いに係合させて、上蓋部材１７２ａの側部に形成された貫通孔１７７と、下蓋部材１７２ｂの側部に形成された貫通孔１７８にリベット１７９（図２）を挿入する。これにより、フレーム部材１７１の一部を覆うように蓋部材１７２が固定される。このようにして構成される容器部材１７（図２）は、合成樹脂製のフレーム部材１７１を含むので、外包部材１２に対して絶縁性を有する。 As shown in FIG. 3, in the unit battery 10, a flexible outer packaging member 12 is placed on a member in which a lower frame member 171b, a lower lid member 172b, and an external connection terminal 16 are integrated. The outer packaging member 12 accommodates the battery element 11 as a power storage element. A positive electrode connection terminal 13 (positive electrode tab) and a negative electrode connection terminal 14 (negative electrode tab) are electrically connected to the battery element 11 and led out from the outer packaging member 12. A relay member 15 is electrically connected to the positive electrode connection terminal 13. An upper frame member 171 a having an opening (space portion) 175 is placed on the outer packet member 12 configured as described above. Then, the upper lid member 172a is placed on the upper frame member 171a. The frame member 171 (FIG. 2) includes an upper frame member 171a and a lower frame member 171b. The lid member 172 (FIG. 2) includes an upper lid member 172a and a lower lid member 172b. The upper lid member 172a and the lower lid member 172b are engaged with each other, and a rivet 179 (see FIG. 7) is formed in the through hole 177 formed in the side portion of the upper lid member 172a and the through hole 178 formed in the side portion of the lower lid member 172b. 2) is inserted. Thereby, the lid member 172 is fixed so as to cover a part of the frame member 171. Since the container member 17 (FIG. 2) configured in this manner includes the synthetic resin frame member 171, the container member 17 (FIG. 2) is insulative with respect to the outer packet member 12.
　図４と図５に示すように、合成樹脂製の下フレーム部材１７１ｂの両端部には電極端子保持部１７３が配置されている。電極端子保持部１７３に金属製の外部接続用端子１６が内蔵されている。図４に示すように、外部接続用端子１６の連結平面１６１が電極端子保持部１７３の外側に導出されて露出し、電極端子接続平面１６２が電極端子保持部１７３の凹部にて露出している。下フレーム部材１７１ｂの中央部には開口部（空間部）１７５が形成され、開口部１７５を囲む枠状部からなる外包部材保持部１７４が形成されている。下フレーム部材１７１ｂの下には金属製の下蓋部材１７２ｂが一体化されて固着されている。これにより、図４に示すように下蓋部材１７２ｂの主平面が開口部１７５から露出している。電極端子保持部１７３の平面部には貫通孔１７６が形成され、下蓋部材１７２ｂの平面部には貫通孔１７６ａが形成されている。これらの貫通孔１７６、１７６ａにボルト３１（図１）が挿入されてナット３２で締結されることにより、単位電池１０が固定される。外部接続用端子１６の連結平面１６１には貫通孔１６３が形成されている。この貫通孔１６３に締結部材２１（図１）が挿入されて固定されることにより、連結部材２０が外部接続用端子１６を相互に連結して固定される。 As shown in FIGS. 4 and 5, electrode terminal holding portions 173 are disposed at both ends of the lower frame member 171b made of synthetic resin. A metal external connection terminal 16 is built in the electrode terminal holding portion 173. As shown in FIG. 4, the connection plane 161 of the external connection terminal 16 is led out to the outside of the electrode terminal holding part 173 and exposed, and the electrode terminal connection plane 162 is exposed in the recess of the electrode terminal holding part 173. . An opening (space part) 175 is formed at the center of the lower frame member 171b, and an outer member holding part 174 made of a frame-like part surrounding the opening 175 is formed. A metal lower lid member 172b is integrated and fixed under the lower frame member 171b. Thereby, as shown in FIG. 4, the main plane of the lower lid member 172 b is exposed from the opening 175. A through hole 176 is formed in the flat portion of the electrode terminal holding portion 173, and a through hole 176a is formed in the flat portion of the lower lid member 172b. The unit battery 10 is fixed by inserting the bolt 31 (FIG. 1) into the through holes 176 and 176a and fastening with the nut 32. A through hole 163 is formed in the connecting plane 161 of the external connection terminal 16. When the fastening member 21 (FIG. 1) is inserted and fixed in the through-hole 163, the connecting member 20 is fixed by connecting the external connection terminals 16 to each other.
　図６に示すように、可撓性の外包部材１２が電池要素１１を収容している。正極接続用端子１３および負極接続用端子１４は、電池要素１１に電気的に接続されて外包部材１２から外側に導出されている。正極接続用端子１３および負極接続用端子１４のそれぞれに外部接続用端子１６が電気的に接続されている。正極接続用端子１３と外部接続用端子１６との間を電気的に接続するように中継部材１５（継ぎタブ）が設けられている。その接続部分には湾曲部１５１が形成されている。外部接続用端子１６は、正極接続用端子１３または中継部材１５の主平面１３１と交差する方向（この実施形態では直交する方向）に、また、負極接続用端子１４の主平面１４１と交差する方向（この実施形態では直交する方向）に、延在する連結平面１６１を有する。正極側では中継部材１５が外部接続用端子１６の電極端子接続平面１６２に接続され、負極側では負極接続用端子１４が外部接続用端子１６の電極端子接続平面１６２に接続されている。 As shown in FIG. 6, the flexible outer packaging member 12 accommodates the battery element 11. The positive electrode connection terminal 13 and the negative electrode connection terminal 14 are electrically connected to the battery element 11 and led out from the outer packaging member 12. An external connection terminal 16 is electrically connected to each of the positive electrode connection terminal 13 and the negative electrode connection terminal 14. A relay member 15 (joint tab) is provided so as to electrically connect between the positive electrode connection terminal 13 and the external connection terminal 16. A curved portion 151 is formed at the connecting portion. The external connection terminal 16 intersects with the main plane 131 of the positive electrode connection terminal 13 or the relay member 15 (direction orthogonal in this embodiment) and intersects with the main plane 141 of the negative electrode connection terminal 14. In the present embodiment, the connecting plane 161 extends in the orthogonal direction. The relay member 15 is connected to the electrode terminal connection plane 162 of the external connection terminal 16 on the positive electrode side, and the negative electrode connection terminal 14 is connected to the electrode terminal connection plane 162 of the external connection terminal 16 on the negative electrode side.
　以下、図１～図６を参照して、各部材の構成について、より詳細に説明する。 Hereinafter, the configuration of each member will be described in more detail with reference to FIGS.
　単位電池１０は、電池要素１１と、電池要素１１を収容する外包部材１２と、外包部材１２の外周縁から互いに対向する方向に導出された薄板状の正極接続用端子１３、負極接続用端子１４とを備える。たとえば、外包部材１２の長さ寸法は１６０ｍｍ、幅寸法は８０ｍｍ、厚み寸法は５ｍｍである。なお、外包部材１２の長さ寸法、幅寸法、厚み寸法は上記の寸法に限定されない。 The unit battery 10 includes a battery element 11, an outer packaging member 12 that houses the battery element 11, a thin plate-like positive electrode connection terminal 13 and a negative electrode connection terminal 14 that are led out from the outer peripheral edge of the outer packaging member 12 to face each other. With. For example, the length dimension of the outer packaging member 12 is 160 mm, the width dimension is 80 mm, and the thickness dimension is 5 mm. In addition, the length dimension, the width dimension, and the thickness dimension of the outer packaging member 12 are not limited to the above dimensions.
　外部接続用端子１６は、銅または銅合金からなり、正極接続用端子１３、負極接続用端子１４（厚み０．２ｍｍ）よりも分厚い１ｍｍの板状の形態を有し、長さ寸法は外包部材１２の幅方向の寸法よりも小さくなるように形成されている。また、外部接続用端子１６は、その略中央部において正極接続用端子１３、負極接続用端子１４とレーザー溶接により電気的に接続される。そして、外部接続用端子１６の両端部は、略中央部に対して略直交する方向に折り曲げられることによって、正極接続用端子１３、負極接続用端子１４の主平面と直交する方向にそれぞれ連結平面１６１を形成する。 The external connection terminal 16 is made of copper or a copper alloy and has a plate-like form of 1 mm thicker than the positive electrode connection terminal 13 and the negative electrode connection terminal 14 (thickness 0.2 mm). It is formed to be smaller than 12 dimensions in the width direction. The external connection terminal 16 is electrically connected to the positive electrode connection terminal 13 and the negative electrode connection terminal 14 by laser welding at a substantially central portion thereof. Then, both end portions of the external connection terminal 16 are bent in a direction substantially orthogonal to the substantially central portion, thereby connecting each plane in a direction orthogonal to the main plane of the positive connection terminal 13 and the negative connection terminal 14. 161 is formed.
　連結部材２０は、銅または銅合金からなり、外部接続用端子１６と同様の板状の形態を有し、隣接する外部接続用端子１６を連結可能な長さ寸法に形成されている。たとえば、複数の単位電池１０を直列接続する場合には、隣接する２個の単位電池１０の反対極に接続された外部接続用端子１６同士を接続する。一方、複数の単位電池１０を並列接続する場合には、隣接する２個以上の単位電池１０の同一極に接続された外部接続用端子１６同士を接続する。外部接続用端子１６の連結平面１６１と連結部材２０は、それぞれ貫通孔を有しており、ボルト・ナットによって強固に連結される。 The connecting member 20 is made of copper or a copper alloy, has a plate shape similar to that of the external connection terminal 16, and is formed to have a length dimension capable of connecting adjacent external connection terminals 16. For example, when a plurality of unit cells 10 are connected in series, the external connection terminals 16 connected to the opposite poles of the two adjacent unit cells 10 are connected. On the other hand, when a plurality of unit cells 10 are connected in parallel, the external connection terminals 16 connected to the same pole of two or more adjacent unit cells 10 are connected. The connecting plane 161 of the external connection terminal 16 and the connecting member 20 each have a through hole and are firmly connected by bolts and nuts.
　各単位電池１０は、容器部材１７に収容される。容器部材１７は、フレーム部材１７１と蓋部材１７２とを備える。フレーム部材１７１は、合成樹脂からなり、平面視で矩形状を有し、正極接続用端子１３、負極接続用端子１４が載置される電極端子保持部１７３と、外包部材１２の周縁部が載置される外包部材保持部１７４と、中央部の開口部１７５とが形成されている。外包部材１２の周縁部が外包部材保持部１７４に載置されることによって、外包部材１２の側端部と蓋部材１７２との絶縁性が確保される（後述するラミネートフィルムの熱溶着部から、金属からなる中間層が露出する場合がある）。電極端子保持部１７３には、外部接続用端子１６が設けられており、露出した外部接続用端子１６の略中央部と正極接続用端子１３、負極接続用端子１４とが上述したようにレーザー溶接にて電気的に接続されるとともに、外部接続用端子１６の連結平面１６１が電極端子保持部１７３から外部へ突出するように設けられる。 Each unit battery 10 is accommodated in a container member 17. The container member 17 includes a frame member 171 and a lid member 172. The frame member 171 is made of synthetic resin and has a rectangular shape in plan view. The electrode terminal holding portion 173 on which the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are placed, and the peripheral portion of the outer packaging member 12 are placed. An outer packaging member holding part 174 to be placed and an opening part 175 at the center part are formed. By placing the peripheral edge of the outer packaging member 12 on the outer packaging member holding portion 174, insulation between the side end portion of the outer packaging member 12 and the lid member 172 is ensured (from a heat-welded portion of a laminate film described later, An intermediate layer made of metal may be exposed). The electrode terminal holding portion 173 is provided with the external connection terminal 16, and the exposed substantially central portion of the external connection terminal 16 and the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are laser-welded as described above. The connection plane 161 of the external connection terminal 16 is provided so as to protrude from the electrode terminal holding portion 173 to the outside.
　単位電池連結部材３０は、ボルト３１とナット３２からなり、電極端子保持部１７３の平面部に形成され、下フレーム部材１７１ｂの四隅に設けられた貫通孔１７６に挿通することによって、複数の単位電池１０が積層方向に連結される。 The unit battery connecting member 30 includes a bolt 31 and a nut 32, is formed in the flat portion of the electrode terminal holding portion 173, and is inserted into through holes 176 provided at the four corners of the lower frame member 171b, whereby a plurality of unit batteries are provided. 10 are connected in the stacking direction.
　蓋部材１７２は、アルミニウムまたはアルミニウム合金からなり、それぞれ断面がコの字状の上蓋部材１７２ａおよび下蓋部材１７２ｂを有する。上蓋部材１７２ａと下蓋部材１７２ｂとでフレーム部材１７１の開口部１７５を覆うとともに、上蓋部材１７２ａと下蓋部材１７２ｂの側部においてリベット１７９が貫通孔１７７、１７８に挿入されて互いにかしめられることにより上蓋部材１７２ａと下蓋部材１７２ｂとが固定される。蓋部材１７２の内部でリベット１７９の端部が外包部材１２の側端部と接触して短絡しないように、外包部材１２の側端部においてリベット１７９の挿入位置に対応する箇所１２１（図３）に絶縁テープ（図示せず）が貼り付けられる。 The lid member 172 is made of aluminum or an aluminum alloy, and has an upper lid member 172a and a lower lid member 172b each having a U-shaped cross section. By covering the opening 175 of the frame member 171 with the upper lid member 172a and the lower lid member 172b, the rivets 179 are inserted into the through holes 177 and 178 on the side portions of the upper lid member 172a and the lower lid member 172b, and are caulked together. The upper lid member 172a and the lower lid member 172b are fixed. A location 121 corresponding to the insertion position of the rivet 179 at the side end of the outer packaging member 12 so that the end of the rivet 179 contacts the side end of the outer packaging member 12 and does not short-circuit inside the lid member 172 (FIG. 3). An insulating tape (not shown) is affixed to.
　外包部材１２の上下の主平面（図３）は、上蓋部材１７２ａおよび下蓋部材１７２ｂのそれぞれに当接しているので、アルミニウム製の上蓋部材１７２ａおよび下蓋部材１７２ｂが放熱板の役割も果たす。外包部材１２の上面と上蓋部材１７２ａを当接させずに隙間を設けてもよい。なお、外包部材１２の下側の主平面と下蓋部材１７２ｂとは、接着剤で接着されている。 Since the upper and lower main planes (FIG. 3) of the outer packaging member 12 are in contact with the upper lid member 172a and the lower lid member 172b, the aluminum upper lid member 172a and the lower lid member 172b also serve as a heat sink. A gap may be provided without bringing the upper surface of the outer packet member 12 into contact with the upper lid member 172a. The lower main surface of the outer packet member 12 and the lower lid member 172b are bonded with an adhesive.
　正極接続用端子１３、負極接続用端子１４が載置される電極端子保持部１７３（図２）の厚みは、蓋部材１７２の側部の厚みより大きいため、隣接する単位電池１０の上蓋部材１７２ａと下蓋部材１７２ｂとの間に隙間が形成される。これにより、通気性が増し、放熱性が向上する。 Since the thickness of the electrode terminal holding portion 173 (FIG. 2) on which the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are placed is larger than the thickness of the side portion of the lid member 172, the upper lid member 172 a of the adjacent unit battery 10. A gap is formed between the lower lid member 172b and the lower lid member 172b. Thereby, air permeability increases and heat dissipation improves.
　また、正極接続用端子１３には、外部接続用端子１６との電気的接続性を向上させるために、中継部材１５が接続される。中継部材１５は正極接続用端子１３と超音波溶着によって接合される。さらに、中継部材１５はその超音波溶着部分において湾曲部１５１が形成される。これにより、不所望な外部応力やヒートショックなどの場合に応力緩和が可能となる。超音波溶着部分に湾曲部１５１を設けることにより、激しい応力が加えられた場合に湾曲部１５１が先に破断されやすいため、電池要素１１が内部短絡してしまうのを防止することができる。また、中継部材１５の一方端部は、フレーム部材１７１に固定された外部接続用端子１６とレーザー溶接されることにより、通常は湾曲部１５１の形状を安定させるので、応力緩和に優れる。 Also, a relay member 15 is connected to the positive electrode connection terminal 13 in order to improve electrical connectivity with the external connection terminal 16. The relay member 15 is joined to the positive electrode connection terminal 13 by ultrasonic welding. Further, the relay member 15 is formed with a curved portion 151 at the ultrasonic welding portion. As a result, stress relaxation is possible in the case of undesired external stress or heat shock. By providing the bending portion 151 at the ultrasonic welding portion, the bending portion 151 is likely to be broken first when intense stress is applied, so that the battery element 11 can be prevented from being internally short-circuited. Further, one end portion of the relay member 15 is laser welded to the external connection terminal 16 fixed to the frame member 171, so that the shape of the curved portion 151 is normally stabilized, and therefore, the stress relaxation is excellent.
　正極接続用端子１３、負極接続用端子１４は、外包部材１２の外周縁から同一方向に導出されてもよい。この場合には、たとえば、外部接続用端子１６の一方端部だけを略直交する方向に折り曲げて、正極接続用端子１３、負極接続用端子１４の主平面１３１、１４１と直交する方向に連結平面１６１を形成すればよい。 The positive electrode connection terminal 13 and the negative electrode connection terminal 14 may be led out from the outer peripheral edge of the outer packaging member 12 in the same direction. In this case, for example, only one end portion of the external connection terminal 16 is bent in a direction substantially orthogonal to each other, and a connecting plane is formed in a direction orthogonal to the main planes 131 and 141 of the positive connection terminal 13 and the negative connection terminal 14. 161 may be formed.
　正極接続用端子１３の材質は、アルミニウムまたはアルミニウム合金に限らず、ニッケル、鉄、ステンレスなどの単体または合金でもよい。正極接続用端子１３の厚みは０．１～１．０ｍｍくらいであればよい。 The material of the positive electrode connection terminal 13 is not limited to aluminum or an aluminum alloy, but may be a simple substance or an alloy such as nickel, iron, or stainless steel. The thickness of the positive electrode connection terminal 13 may be about 0.1 to 1.0 mm.
　負極接続用端子１４の材質は、銅または銅合金に限らず、ニッケル、アルミニウム、鉄、ステンレスなどの単体または合金でもよい。負極接続用端子１４の厚みは０．１～１．０ｍｍくらいであればよい。 The material of the negative electrode connection terminal 14 is not limited to copper or a copper alloy, but may be a simple substance or an alloy such as nickel, aluminum, iron, and stainless steel. The thickness of the negative electrode connection terminal 14 may be about 0.1 to 1.0 mm.
　中継部材１５は必ずしも必要ではなく、必要に応じて設ければよい。また、中継部材１５の湾曲部１５１も必ずしも必要ではなく、必要に応じて設ければよい。中継部材１５の材質としては、銅または銅合金が用いられるが、それに限らず、アルミニウムまたはアルミニウム合金からなる基材にＮｉめっきを施したものを用いてもよい。この場合、Ｎｉめっきの代わりにＳｎめっきを施してもよい。湾曲部１５１は正極側に限らず、負極側に設けてもよい。湾曲部１５１は正極側、負極側両方に設けてもよい。 The relay member 15 is not necessarily required, and may be provided as necessary. Further, the curved portion 151 of the relay member 15 is not necessarily required, and may be provided as necessary. The material of the relay member 15 is copper or a copper alloy, but is not limited thereto, and a base material made of aluminum or an aluminum alloy with Ni plating may be used. In this case, Sn plating may be performed instead of Ni plating. The bending portion 151 is not limited to the positive electrode side, and may be provided on the negative electrode side. The bending portion 151 may be provided on both the positive electrode side and the negative electrode side.
　外部接続用端子１６の材質は、銅または銅合金に限らず、ニッケル、アルミニウム、鉄、ステンレスなどの単体または合金でもよい。必要に応じてＮｉめっきやＳｎめっきを施してもよい。外部接続用端子１６の厚みは、０．２ｍｍ～３ｍｍくらいであればよく、正極接続用端子１３、負極接続用端子１４と同じ厚みでもよい。外部接続用端子１６は、正極接続用端子１３、負極接続用端子１４とレーザー溶接により電気的に接続されているが、抵抗溶接などで接続されてもよい。 The material of the external connection terminal 16 is not limited to copper or a copper alloy, but may be a simple substance or an alloy such as nickel, aluminum, iron, and stainless steel. Ni plating or Sn plating may be applied as necessary. The thickness of the external connection terminal 16 may be about 0.2 mm to 3 mm, and may be the same thickness as the positive electrode connection terminal 13 and the negative electrode connection terminal 14. The external connection terminal 16 is electrically connected to the positive electrode connection terminal 13 and the negative electrode connection terminal 14 by laser welding, but may be connected by resistance welding or the like.
　連結部材２０の材質は、銅または銅合金に限らず、ニッケル、アルミニウム、鉄、ステンレスなどの単体または合金でもよい。外部接続用端子１６の連結平面１６１と連結部材２０とは、ボルト・ナットによる連結だけでなく、リベット、スタッド、ネジ、ピンなどで連結してもよい。 The material of the connecting member 20 is not limited to copper or copper alloy, but may be simple substance or alloy such as nickel, aluminum, iron, and stainless steel. The connecting plane 161 of the external connection terminal 16 and the connecting member 20 may be connected not only by bolts and nuts but also by rivets, studs, screws, pins, or the like.
　容器部材１７は、合成樹脂製のフレーム部材１７１とアルミニウム製の蓋部材１７２とから構成されているが、合成樹脂製の蓋部材１７２を用いてもよい。フレーム部材１７１と蓋部材１７２とが合成樹脂製で一体化されたものを採用してもよい。上蓋部材１７２ａと下蓋部材１７２ｂのいずれか一方をアルミニウム製にしてもよい。蓋部材１７２の材質は、アルミニウムまたはアルミニウム合金に限らず、ニッケル、アルミニウム、鉄、ステンレス鋼などの単体または合金でもよい。蓋部材１７２を構成する上蓋部材１７２ａと下蓋部材１７２ｂの形状は、それぞれが断面コの字状に限らず、いずれかが断面コの字状でもよいし、それぞれが平板状でもよい。フレーム部材１７１と上蓋部材１７２ａと下蓋部材１７２ｂのそれぞれとが係合するように形成されればよい。フレーム部材１７１の中央部の開口部１７５は、必ずしも必要ではなく、中央部も合成樹脂で覆われていてもよい。 The container member 17 is composed of a synthetic resin frame member 171 and an aluminum lid member 172, but a synthetic resin lid member 172 may be used. The frame member 171 and the lid member 172 may be made of synthetic resin and integrated. Either one of the upper lid member 172a and the lower lid member 172b may be made of aluminum. The material of the lid member 172 is not limited to aluminum or an aluminum alloy, and may be a simple substance or an alloy such as nickel, aluminum, iron, and stainless steel. The shapes of the upper lid member 172a and the lower lid member 172b constituting the lid member 172 are not limited to the U-shaped cross section, and either one may be U-shaped in cross section, or each may be flat. The frame member 171, the upper lid member 172a, and the lower lid member 172b may be formed so as to be engaged with each other. The opening 175 at the center of the frame member 171 is not always necessary, and the center may also be covered with synthetic resin.
　隣接する単位電池１０の上蓋部材１７２ａと下蓋部材１７２ｂとの間の隙間は必ずしも必要ではない。単位電池連結部材３０は、必ずしも必要ではない。また、単位電池１０をボルト３１とナット３２によって連結しないで、リベット、スタッド、ネジ、ピンなどで連結してもよい。フレーム部材１７１の電極端子保持部１７３または外包部材保持部１７４に凹部と凸部とを形成し、隣接する単位電池１０を積み重ねたときに、電極端子保持部１７３または外包部材保持部１７４の凹部と凸部とが互いに嵌合することにより、単位電池１０同士が積層方向に連結されてもよい。 The gap between the upper lid member 172a and the lower lid member 172b of the adjacent unit cells 10 is not necessarily required. The unit battery connecting member 30 is not always necessary. Further, the unit cells 10 may be connected by rivets, studs, screws, pins, etc. without being connected by the bolts 31 and the nuts 32. When the concave and convex portions are formed in the electrode terminal holding portion 173 or the outer packaging member holding portion 174 of the frame member 171, and the adjacent unit cells 10 are stacked, the concave portions of the electrode terminal holding portion 173 or the outer packaging member holding portion 174 The unit cells 10 may be connected in the stacking direction by fitting the protrusions to each other.
　電池パック１における単位電池１０の直列数／並列数は、電池パック１の用途や単位電池１０の電圧に応じて任意に設定される。電池パック１では、単位電池１０の積み重ね方向が電池パック１の載置面に対して直交する方向に、いいかえれば、単位電池１０の主平面が電池パック１の載置面に対して平行な方向に、複数の単位電池１０が縦積みされているが、積み重ね方向が電池パック１の載置面に対して平行な方向に、いいかえれば、単位電池１０の主平面が電池パック１の載置面に対して直交する方向に、複数の単位電池１０が横積み（立置き）されてもよい。 The number of series / parallel numbers of the unit batteries 10 in the battery pack 1 is arbitrarily set according to the use of the battery pack 1 and the voltage of the unit battery 10. In the battery pack 1, the stacking direction of the unit batteries 10 is in a direction orthogonal to the mounting surface of the battery pack 1, in other words, the direction in which the main plane of the unit battery 10 is parallel to the mounting surface of the battery pack 1. In addition, a plurality of unit cells 10 are stacked vertically, and the stacking direction is parallel to the mounting surface of the battery pack 1, in other words, the main plane of the unit battery 10 is the mounting surface of the battery pack 1. A plurality of unit cells 10 may be horizontally stacked (standing) in a direction orthogonal to the vertical direction.
　なお、電池パック１は、４直２並に構成された８個の単位電池１０が積層された組電池に、必要に応じて保護回路を設け、組電池の総プラス端子と総マイナス端子を外部端子に接続することにより使用される。電池パック１は、大電流を必要とする電気・電子機器やモータ等の電源に用いられる。具体的には、電池パック１の用途としては、ＨＥＶ（ハイブリッド自動車）、ＰＨＥＶ（プラグインハイブリッド自動車）、ＥＶ（電気自動車）、電力貯蔵、電動工具、電動アシスト自転車、電動バイク、ＵＰＳ（無停電電源）、ＡＧＶ（自動搬送車）、フォークリフトなどの建機、エンジンスターター、ポータブル電源、携帯用情報端末などが挙げられる。 In addition, the battery pack 1 is provided with a protection circuit as necessary in an assembled battery in which eight unit batteries 10 configured in a 4-by-2 configuration are stacked, and the total positive terminal and the total negative terminal of the assembled battery are externally provided. Used by connecting to a terminal. The battery pack 1 is used as a power source for electric / electronic devices and motors that require a large current. Specifically, the battery pack 1 is used for HEV (hybrid vehicle), PHEV (plug-in hybrid vehicle), EV (electric vehicle), power storage, electric tool, electric assist bicycle, electric motorcycle, UPS (uninterruptible power supply). Power supply), AGV (automatic guided vehicle), construction equipment such as a forklift, engine starter, portable power supply, portable information terminal, and the like.
　以上のように構成される電池パック１によれば、要約すれば、次のような作用効果を得ることができる。 According to the battery pack 1 configured as described above, in summary, the following operational effects can be obtained.
　本発明の電池パック１では、複数の単位電池１０を電気的に接続するために、各単位電池１０の外部接続用端子１６が、正極接続用端子１３および負極接続用端子１４の主平面１３１、１４１と交差する方向に延在する連結平面１６１にて連結部材２０に連結される。このため、各単位電池１０の外部接続用端子１６の連結平面１６１を面接触により連結部材２０に接触させることができる。これにより、接続される単位電池１０間の電気的な接触抵抗を低減させることができ、すなわち、単位電池１０間の電気的接続性を向上させることができる。したがって、電池パック１において集電抵抗を低減させることが可能になる。 In the battery pack 1 of the present invention, in order to electrically connect a plurality of unit cells 10, the external connection terminals 16 of the unit cells 10 are the main plane 131 of the positive electrode connection terminals 13 and the negative electrode connection terminals 14, It is connected to the connecting member 20 by a connecting plane 161 extending in a direction intersecting with 141. For this reason, the connecting plane 161 of the external connection terminal 16 of each unit battery 10 can be brought into contact with the connecting member 20 by surface contact. Thereby, the electrical contact resistance between the unit cells 10 to be connected can be reduced, that is, the electrical connectivity between the unit cells 10 can be improved. Therefore, the current collecting resistance can be reduced in the battery pack 1.
　また、本発明の電池パック１では、各単位電池１０の外部接続用端子１６と連結部材２０とを、機械的固定手段を用いて固着させることができる。このため、単位電池１０同士を接続するための作業を容易に行うことができるので、作業性が良好である。また、各単位電池１０の外部接続用端子１６と連結部材２０とを、機械的固定手段を用いて固着させることができるので、単位電池１０を誤って接続した場合に接続のやり直しをすることができる。さらに、各単位電池１０の外部接続用端子１６と連結部材２０とを、機械的固定手段を用いて固着させることができるので、電池パック１を構成する単位電池１０を必要個数だけ重ねて一度に接続することができる。 Further, in the battery pack 1 of the present invention, the external connection terminal 16 and the connecting member 20 of each unit battery 10 can be fixed using a mechanical fixing means. For this reason, since the operation | work for connecting unit batteries 10 can be performed easily, workability | operativity is favorable. In addition, since the external connection terminal 16 and the connecting member 20 of each unit battery 10 can be fixed using a mechanical fixing means, when the unit battery 10 is mistakenly connected, the connection can be performed again. it can. Furthermore, since the external connection terminal 16 and the connecting member 20 of each unit battery 10 can be fixed using a mechanical fixing means, the necessary number of unit batteries 10 constituting the battery pack 1 are stacked at a time. Can be connected.
　本発明の電池パック１において、連結部材２０が、複数の単位電池１０を厚み方向に積み重ねることにより直列および／または並列に連結することにより、連結部材２０を用いて最短距離で複数の単位電池１０を連結することができ、集電抵抗を低減させることが可能となる。 In the battery pack 1 of the present invention, the connecting member 20 connects the plurality of unit cells 10 in the thickness direction to connect them in series and / or in parallel, thereby using the connecting member 20 and the plurality of unit cells 10 at the shortest distance. Can be connected, and the current collecting resistance can be reduced.
　また、本発明の電池パック１において、連結部材２０が、取り外し可能な締結部材２１で外部接続用端子１６を連結することにより、単位電池１０を誤って接続した場合に接続のやり直しを容易に行うことができる。また、電池パック１において、不良の単位電池１０を容易に交換することができる。この場合、締結部材２１が、ボルト・ナット、ネジおよびピンからなる群より選ばれた一種であることが好ましい。 Further, in the battery pack 1 of the present invention, the connecting member 20 connects the external connection terminal 16 with the detachable fastening member 21, so that when the unit battery 10 is erroneously connected, the connection is easily performed again. be able to. Moreover, in the battery pack 1, the defective unit battery 10 can be easily replaced. In this case, the fastening member 21 is preferably a kind selected from the group consisting of bolts / nuts, screws and pins.
　さらに、本発明の電池パック１において、外部接続用端子１６が、板状材を折り曲げることにより形成された連結平面１６１を有する。このように一体の板状材から外部接続用端子１６を形成することにより、接続される単位電池１０間の電気的な接触抵抗をさらに低減させることができ、すなわち、単位電池１０間の電気的接続性をより向上させることができる。 Furthermore, in the battery pack 1 of the present invention, the external connection terminal 16 has a connection plane 161 formed by bending a plate-like material. Thus, by forming the external connection terminals 16 from an integral plate-like material, the electrical contact resistance between the unit cells 10 to be connected can be further reduced, that is, the electrical connection between the unit cells 10. Connectivity can be further improved.
　本発明の電池パック１において、外部接続用端子１６が、正極接続用端子１３および負極接続用端子１４よりも大きい厚みを有することにより、比較的薄い正極用接続用端子１３同士、比較的薄い負極接続用端子１４同士を直接接続するよりも剛性を向上させることができる。 In the battery pack 1 of the present invention, the external connection terminal 16 has a larger thickness than the positive electrode connection terminal 13 and the negative electrode connection terminal 14, so that the relatively thin positive electrode connection terminals 13 are relatively thin with each other. Rigidity can be improved rather than connecting the connection terminals 14 directly.
　本発明の電池パック１において、外部接続用端子１６が、正極接続用端子１３および負極接続用端子１４のそれぞれの両側に配置された二つの連結平面１６１を有することにより、外部接続用端子１６と連結部材２０との接触面積をより大きくすることができる。 In the battery pack 1 of the present invention, the external connection terminal 16 has two connection planes 161 arranged on both sides of the positive electrode connection terminal 13 and the negative electrode connection terminal 14, thereby The contact area with the connecting member 20 can be further increased.
　本発明の電池パック１において、正極接続用端子１３および負極接続用端子１４のそれぞれと外部接続用端子１６とは、レーザー溶接によって電気的に接続されていることにより、比較的分厚い正極接続用端子１３と負極接続用端子１４を用いた場合でも、正極接続用端子１３および負極接続用端子１４のそれぞれと外部接続用端子１６とを確実に接続することができる。 In the battery pack 1 of the present invention, each of the positive electrode connection terminal 13 and the negative electrode connection terminal 14 and the external connection terminal 16 are electrically connected by laser welding, so that a relatively thick positive electrode connection terminal. Even when 13 and the negative electrode connection terminal 14 are used, each of the positive electrode connection terminal 13 and the negative electrode connection terminal 14 and the external connection terminal 16 can be reliably connected.
　本発明の電池パック１において、単位電池１０が、外包部材１２と正極接続用端子１３および負極接続用端子１４を収容する容器部材１７を含み、外部接続用端子１６が容器部材１７から外側に導出されていることにより、電池要素１１を収容する外包部材１２と正極接続用端子１３および負極接続用端子１４をより強固に保持することができるとともに、外部接続用端子１６を単位電池１０ごとに支持することができる。この場合、容器部材１７が、合成樹脂製のフレーム部材１７１と、金属製の蓋部材１７２とを含む。このように金属製の蓋部材１７２を用いることにより、単位電池１０の放熱性を向上させることができる。さらにこの場合、蓋部材１７２が上蓋部材１７２ａと下蓋部材１７２ｂとを含み、上蓋部材１７２ａと下蓋部材１７２ｂとが互いに係合することによりフレーム部材１７１の少なくとも一部を覆うように構成されていることにより、容器部材１７の機械的強度を向上させることができ、シール性も向上させることができる。 In the battery pack 1 of the present invention, the unit battery 10 includes a container member 17 that houses the outer packaging member 12, the positive electrode connection terminal 13, and the negative electrode connection terminal 14, and the external connection terminal 16 is led out from the container member 17. As a result, the outer packaging member 12, the positive electrode connection terminal 13, and the negative electrode connection terminal 14 that accommodate the battery element 11 can be more firmly held, and the external connection terminal 16 is supported for each unit battery 10. can do. In this case, the container member 17 includes a frame member 171 made of synthetic resin and a lid member 172 made of metal. Thus, by using the metal lid member 172, the heat dissipation of the unit battery 10 can be improved. Further, in this case, the lid member 172 includes an upper lid member 172a and a lower lid member 172b, and the upper lid member 172a and the lower lid member 172b are configured to cover at least a part of the frame member 171 by being engaged with each other. As a result, the mechanical strength of the container member 17 can be improved, and the sealing performance can also be improved.
　本発明の電池パック１において、容器部材１７が絶縁性を有し、外包部材１２が、少なくとも熱可塑性樹脂からなる内面層と、内面層の外側に配置される金属層とを含み、内面層を熱溶着することにより蓄電要素が封止されるように構成されている。このとき、正極接続用端子１３および負極接続用端子１４が熱溶着された内面層から外側に導出されていることにより、電池要素１１の外部に対する絶縁性を、外包部材１２に対して容器部材１７で補完することができる。 In the battery pack 1 of the present invention, the container member 17 has an insulating property, and the outer packaging member 12 includes at least an inner surface layer made of a thermoplastic resin and a metal layer disposed outside the inner surface layer, The power storage element is configured to be sealed by heat welding. At this time, since the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are led out from the heat-welded inner surface layer, the insulation of the battery element 11 with respect to the outside is given to the container member 17 with respect to the outer packaging member 12. It can be complemented with.
　本発明の電池パック１において、正極接続用端子１３および負極接続用端子１４が、外包部材１２の外周縁から互いに対向する方向に導出されていることにより、同一方向に正極接続用端子１３と負極接続用端子１４が導出される場合に比べて、端子の幅を大きくしやすいため、集電抵抗を小さくすることができる。また、同一方向に正極接続用端子１３と負極接続用端子１４が導出される場合に比べて、互いに対向する方向に正極接続用端子１３と負極接続用端子１４が導出される方が放熱性が高いため、高入出力が可能で安全性を高めることができる。 In the battery pack 1 of the present invention, the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are led out from the outer peripheral edge of the outer packaging member 12 in a direction facing each other, so that the positive electrode connection terminal 13 and the negative electrode are connected in the same direction. Compared to the case where the connection terminal 14 is derived, the current collecting resistance can be reduced because the width of the terminal can be easily increased. Further, compared to the case where the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are led out in the same direction, the heat dissipation is better when the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are led out in the opposite direction. Since it is high, high input / output is possible and safety can be improved.
　本発明の電池パック１において、単位電池１０が、正極接続用端子１３と外部接続用端子１６との間を電気的に接続する中継部材１５を含むことにより、正極接続用端子１３と外部接続用端子１６との電気的接続性を向上させることができる。この場合、正極接続用端子１３と中継部材１５との接続部分には湾曲部１５１が形成されていることにより、不所望な外部応力やヒートショックなどが接続部分に加えられた場合に応力を緩和することができる。さらにこの場合、湾曲部１５１に超音波溶着部が形成されていることにより、湾曲部１５１に過大な応力が加えられた場合に湾曲部１５１が先に破断されやすいため、電池要素１１が内部短絡してしまうのを防止することができる。 In the battery pack 1 of the present invention, the unit battery 10 includes the relay member 15 that electrically connects the positive electrode connection terminal 13 and the external connection terminal 16, so that the positive electrode connection terminal 13 and the external connection terminal are connected. The electrical connectivity with the terminal 16 can be improved. In this case, the curved portion 151 is formed in the connection portion between the positive electrode connection terminal 13 and the relay member 15, so that stress can be relieved when undesired external stress or heat shock is applied to the connection portion. can do. Further, in this case, since the ultrasonic welding portion is formed on the bending portion 151, the bending portion 151 is likely to be broken first when an excessive stress is applied to the bending portion 151. Can be prevented.
　本発明の別の局面によれば、単位電池１０は、電池要素１１を収容する可撓性の外包部材１２と、電池要素１１に電気的に接続されて外包部材１２から外側に導出された正極接続用端子１３および負極接続用端子１４と、正極接続用端子１３および負極接続用端子１４のそれぞれに電気的に接続された外部接続用端子１６とを備える。外部接続用端子１６が、正極接続用端子１３および負極接続用端子１４の主平面１３１、１４１と交差する方向に延在し、かつ、外部端子と電気的に接続される接続平面（連結平面）１６１を有する。この単位電池１０では、外部接続用端子１６によって単位電池１０を外部端子と電気的に容易に接続することができる。 According to another aspect of the present invention, the unit battery 10 includes a flexible outer packaging member 12 that houses the battery element 11, and a positive electrode that is electrically connected to the battery element 11 and led out from the outer packaging member 12. A connection terminal 13 and a negative electrode connection terminal 14, and an external connection terminal 16 electrically connected to each of the positive electrode connection terminal 13 and the negative electrode connection terminal 14 are provided. A connection plane (connection plane) in which the external connection terminal 16 extends in a direction intersecting with the main planes 131 and 141 of the positive electrode connection terminal 13 and the negative electrode connection terminal 14 and is electrically connected to the external terminal. 161. In the unit battery 10, the unit battery 10 can be easily electrically connected to the external terminal by the external connection terminal 16.
　次に、本発明の電池パック１（図１）の構造が適用される単位電池１０の具体的な構成について説明する。 Next, a specific configuration of the unit battery 10 to which the structure of the battery pack 1 (FIG. 1) of the present invention is applied will be described.
　図６に示すように、ラミネート型二次電池の一例であるリチウムイオン二次電池は、電池要素１１を構成する積層体と、積層体と図示しない非水電解液とを収容して封止する外包部材１２と、積層体の集電部を介して積層体に接続されて外包部材１２の外周縁から互いに対向する方向に導出された正極接続用端子１３（正極タブ）および負極接続用端子１４（負極タブ）とから構成される。 As shown in FIG. 6, a lithium ion secondary battery, which is an example of a laminated secondary battery, encloses and seals a laminated body constituting the battery element 11, a laminated body, and a non-aqueous electrolyte (not shown). A positive electrode connection terminal 13 (positive electrode tab) and a negative electrode connection terminal 14 which are connected to the laminated body via the outer packaging member 12 and the current collector of the laminated body and led out from the outer peripheral edge of the outer packaging member 12 to face each other. (Negative electrode tab).
　外包部材１２は、積層体に面する内面側に位置づけられ、合成樹脂からなる内面層と、リチウムイオン二次電池の外側に位置づけられた合成樹脂からなる外面層と、内面層と外面層との間に介在し、金属からなる中間層とから構成される単一のフィルム、すなわち、三層構造のラミネートフィルムで形成されている。内面層は、一例として、ヒートシール可能な熱可塑性樹脂であるポリプロピレンからなり、厚みが３０～１２０μｍである。中間層は、一例として、アルミニウム箔またはアルミニウム合金箔からなり、厚みが３０～５０μｍである。外面層は、一例として、ナイロン（登録商標）からなり、厚みが２０～４０μｍである。このように構成された外包部材１２は、容易に変形しやすい材料であり、可撓性を有する。なお、ラミネートフィルムは必要に応じて層間にウレタン等の接着層を設けてもよい。また、特に本発明においては合成樹脂製の蓋部材１７２を用いた場合には蓋部材１７２が外面層の役割を果たすため、その場合には内面層と中間層（金属層）の二層構造でラミネートフィルムを構成してもよい。図３と図６に示すように、外包部材１２は、たとえば、２枚のラミネートフィルムの縁部を重ね合わせて四方を熱溶着（ヒートシール）することによって封止される。なお、１枚のラミネートフィルムを二つ折りして三方を熱溶着してもよい。 The outer packaging member 12 is positioned on the inner surface side facing the laminate, and includes an inner surface layer made of a synthetic resin, an outer surface layer made of a synthetic resin positioned outside the lithium ion secondary battery, and an inner surface layer and an outer surface layer. It is formed of a single film composed of an intermediate layer made of a metal, that is, a laminate film having a three-layer structure. For example, the inner surface layer is made of polypropylene which is a heat-sealable thermoplastic resin and has a thickness of 30 to 120 μm. For example, the intermediate layer is made of an aluminum foil or an aluminum alloy foil, and has a thickness of 30 to 50 μm. For example, the outer surface layer is made of nylon (registered trademark) and has a thickness of 20 to 40 μm. The outer packaging member 12 configured in this manner is a material that is easily deformed and has flexibility. The laminate film may be provided with an adhesive layer such as urethane between the layers as necessary. In particular, in the present invention, when a synthetic resin lid member 172 is used, the lid member 172 serves as an outer surface layer. In this case, the inner layer and the intermediate layer (metal layer) have a two-layer structure. You may comprise a laminate film. As shown in FIGS. 3 and 6, the outer packaging member 12 is sealed by, for example, overlapping the edges of two laminated films and thermally welding (heat-sealing) the four sides. Note that one laminate film may be folded in half and heat-welded on three sides.
　正極接続用端子１３および負極接続用端子１４は、比較的湾曲可能な厚み０．２ｍｍの薄板状であって矩形状を有し、正極接続用端子１３はアルミニウムまたはアルミニウム合金からなり、負極接続用端子１４は銅または銅合金からなる。 The positive electrode connecting terminal 13 and the negative electrode connecting terminal 14 have a rectangular shape with a relatively bendable thickness of 0.2 mm. The positive electrode connecting terminal 13 is made of aluminum or an aluminum alloy and is used for negative electrode connection. The terminal 14 is made of copper or a copper alloy.
　外包部材１２に収容される積層体は、短冊状の複数の正極と、短冊状の複数の負極と、正極と負極との間に介在するように配置されたセパレータとを含む。複数の正極の各々と複数の負極の各々がセパレータを間に介在して交互に積層されている。セパレータは、短冊状の複数のセパレータを用いてもよいし、一つの長尺状のセパレータを九十九折りにして用いてもよい。また、電極体としては、長尺状の正極、長尺状の負極、および長尺状のセパレータを偏平状に巻回された巻回体でもよい。 The laminate accommodated in the outer packaging member 12 includes a plurality of strip-shaped positive electrodes, a plurality of strip-shaped negative electrodes, and a separator disposed so as to be interposed between the positive electrodes and the negative electrodes. Each of the plurality of positive electrodes and each of the plurality of negative electrodes are alternately stacked with a separator interposed therebetween. As the separator, a plurality of strip-shaped separators may be used, or one long separator may be used by folding into ninety-nine folds. Further, the electrode body may be a wound body in which a long positive electrode, a long negative electrode, and a long separator are wound in a flat shape.
　正極は、正極接続用端子１３に接続される側の端部を除いて、正極活物質を含む正極合材層が集電体の両面上に形成されることによって構成される。負極は、負極接続用端子１４に接続される側の端部を除いて、負極活物質を含む負極合材層が集電体の両面上に形成されることによって構成される。 The positive electrode is configured by forming a positive electrode mixture layer containing a positive electrode active material on both surfaces of the current collector, excluding the end on the side connected to the positive electrode connection terminal 13. The negative electrode is configured by forming a negative electrode mixture layer containing a negative electrode active material on both surfaces of the current collector, except for the end portion on the side connected to the negative electrode connection terminal 14.
　たとえば、正極は、正極活物質と結着剤と必要に応じて導電助剤とを有機溶媒中で混錬してなる正極スラリーを、アルミニウム箔からなる集電体の両面上に均一に塗布し、乾燥した後、プレス加工することにより、正極合材層が集電体の両面上に作製される。また、負極は、負極活物質と結着剤と必要に応じて導電助剤とを有機溶媒中で混錬してなる負極スラリーを、銅箔からなる集電体の両面上に均一に塗布し、乾燥した後、プレス加工することにより、負極合材層が集電体の両面上に作製される。 For example, for a positive electrode, a positive electrode slurry obtained by kneading a positive electrode active material, a binder and, if necessary, a conductive additive in an organic solvent is uniformly applied on both surfaces of an aluminum foil current collector. After drying, the positive electrode mixture layer is produced on both sides of the current collector by pressing. For the negative electrode, a negative electrode slurry obtained by kneading a negative electrode active material, a binder and, if necessary, a conductive additive in an organic solvent is uniformly applied on both sides of a current collector made of copper foil. After drying, the negative electrode mixture layer is produced on both sides of the current collector by pressing.
　正極合材層および負極合材層に含有される結着剤としては、通常、リチウムイオン二次電池の正極合材および負極合材に用いられている公知の結着剤を用いることができ、さらに正極合材層および負極合材層には、導電助剤や酸化物等、公知の添加剤を添加することができる。 As the binder contained in the positive electrode mixture layer and the negative electrode mixture layer, a known binder that is usually used in the positive electrode mixture and the negative electrode mixture of a lithium ion secondary battery can be used. Furthermore, well-known additives, such as a conductive support agent and an oxide, can be added to a positive mix layer and a negative mix layer.
　単位電池１０がリチウムイオン二次電池を構成する場合、正極活物質としては、ＴｉＳ2、ＭｏＳ2、ＮｂＳｅ2、Ｖ2Ｏ5等の金属硫化物または酸化物を使用することができる。また、リチウムイオン二次電池の正極活物質としてＬｉＭxＯ2（化学式中、Ｍは一種以上の遷移金属を表し、ｘは電池の充放電状態によって異なり、通常０．０５以上、１．１０以下である）を主体とするリチウム複合酸化物等を使用することができる。このリチウム複合酸化物を構成する遷移金属Ｍとしては、Ｃｏ、Ｎｉ、Ｍｎ等が好ましい。このようなリチウム複合酸化物の具体例としてはＬｉＣｏＯ2、ＬｉＮｉＯ2、ＬｉＮｉyＣｏ1-yＯ2（化学式中、０＜ｙ＜１である）、Ｌｉ1+a（ＮｉxＣｏyＭｎz）Ｏ2-b（化学式中、－０．１＜ａ＜０．２、ｘ＋ｙ＋ｚ＝１、－０．１＜ｂ＜０．１）、ＬｉＭｎ2Ｏ4等を挙げることができる。またＬｉＦｅＰＯ4といったオリビン系材料でもよい。 When the unit battery 10 constitutes a lithium ion secondary battery, a metal sulfide or oxide such as TiS 2 , MoS 2 , NbSe 2 , V 2 O 5 can be used as the positive electrode active material. LiM x O 2 as a positive electrode active material of a lithium ion secondary battery (wherein M represents one or more transition metals, x is different depending on the charge / discharge state of the battery, and is usually 0.05 or more and 1.10 or less. Lithium composite oxide mainly composed of As the transition metal M constituting this lithium composite oxide, Co, Ni, Mn and the like are preferable. Specific examples of such a lithium composite oxide include LiCoO 2 , LiNiO 2 , LiNi y Co 1-y O 2 (where 0 <y <1), Li 1 + a (Ni x Co y Mn z ) O 2-b (in the chemical formula, −0.1 <a <0.2, x + y + z = 1, −0.1 <b <0.1), LiMn 2 O 4 and the like. Alternatively, an olivine-based material such as LiFePO 4 may be used.
　これらのリチウム複合酸化物は、高電圧を発生でき、エネルギー密度が優れた正極活物質となる。正極を作製するために、これらの正極活物質の複数種をあわせて使用してもよい。 These lithium composite oxides can generate a high voltage and become a positive electrode active material having an excellent energy density. In order to produce the positive electrode, a plurality of these positive electrode active materials may be used in combination.
　負極活物質としては、難黒鉛化炭素系材料やグラファイト系材料等の炭素材料を使用することができる。具体的には、熱分解炭素類、コークス類、黒鉛類、ガラス状炭素繊維、有機高分子化合物焼成体、炭素繊維、活性炭等の炭素材料を使用することができる。上記のコークス類には、ピッチコークス、ニードルコークス、石油コークス等がある。また、上記の有機高分子化合物焼成体とは、フェノール樹脂、フラン樹脂等を適当な温度で焼成して炭素化したものをいう。上述した炭素材料のほか、リチウムをドープ、脱ドープできる材料としては、ポリアセチレン、ポリピロール等の高分子や、ＳｎＯ2などのＳｎ酸化物系や、Ｓｎ5Ｃｕ6やＳｉＭｇ2などのＳｎ、Ｓｉ合金系や、Ｌｉ4Ｔｉ5Ｏ12（チタン酸リチウム）等のセラミック酸化物を使用することもできる。負極を作製するために、これらの負極活物質の複数種をあわせて使用してもよい。 As the negative electrode active material, carbon materials such as non-graphitizable carbon materials and graphite materials can be used. Specifically, carbon materials such as pyrolytic carbons, cokes, graphites, glassy carbon fibers, organic polymer compound fired bodies, carbon fibers, and activated carbon can be used. Examples of the cokes include pitch coke, needle coke, and petroleum coke. Moreover, said organic polymer compound fired body means what carbonized by baking a phenol resin, furan resin, etc. at a suitable temperature. In addition to the carbon materials described above, materials that can be doped and dedoped with lithium include polymers such as polyacetylene and polypyrrole, Sn oxides such as SnO 2 , Sn and Si alloys such as Sn 5 Cu 6 and SiMg 2 It is also possible to use a ceramic oxide such as Li 4 Ti 5 O 12 (lithium titanate). In order to produce a negative electrode, a plurality of these negative electrode active materials may be used in combination.
　セパレータとしては、特に限定されるべきものではなく、ポリプロピレン、ポリエチレンなどのポリオレフィンや、セルロース、ポリエチレンテレフタレート、天然繊維パルプなどの不織布といった従来から公知のものを用いることができる。なお、本発明においては、セパレータは、その名称によって限定されるべきものではなく、セパレータの代わりにセパレータとしての機能（役割）を有するような固体電解質やゲル状電解質を用いてもよい。また、アルミナやジルコニアなどの無機材料を含有させたセパレータを用いてもよい。また、正極と負極との間に一枚のセパレータを介在させてもよいし、複数枚のセパレータを介在させてもよい。複数枚のセパレータの材質は同種でも異種でもよい。 The separator is not particularly limited, and conventionally known separators such as polyolefins such as polypropylene and polyethylene, and nonwoven fabrics such as cellulose, polyethylene terephthalate, and natural fiber pulp can be used. In the present invention, the separator is not limited by its name, and a solid electrolyte or gel electrolyte having a function (role) as a separator may be used instead of the separator. Further, a separator containing an inorganic material such as alumina or zirconia may be used. One separator may be interposed between the positive electrode and the negative electrode, or a plurality of separators may be interposed. The material of the plurality of separators may be the same or different.
　非水電解液は、電解質を非水溶媒に溶解して調製される。電解質としては、たとえば、非水溶媒中にＬｉＰＦ6を１．０ｍｏｌ／Ｌの濃度で溶解したものが使用される。ＬｉＰＦ6以外の電解質としては、ＬｉＢＦ4、ＬｉＡｓＦ6、ＬｉＣｌＯ4、ＬｉＣＦ3ＳＯ3、ＬｉＮ（ＳＯ2ＣＦ3）2、ＬｉＣ（ＳＯ2ＣＦ3）3、ＬｉＡｌＣｌ4、ＬｉＳｉＦ6等のリチウム塩を挙げることができる。これらの中でも、電解質として特にＬｉＰＦ6、ＬｉＢＦ4を用いることが酸化安定性の点から望ましい。このような電解質は、非水溶媒中に、０．１ｍｏｌ／Ｌ～３．０ｍｏｌ／Ｌの濃度で溶解されて用いられることが好ましく、０．５ｍｏｌ／Ｌ～２．０ｍｏｌ／Ｌの濃度で溶解されて用いられることがさらに好ましい。非水溶媒としては、たとえば、炭酸プロピレンと炭酸エチレンと炭酸ジエチルとを体積比で５～２０：２０～３０：６０～７０の割合で混合したものが使用される。その他の非水溶媒としては、炭酸プロピレン、炭酸エチレン等の環状炭酸エステル；炭酸ジエチル、炭酸ジメチル等の鎖状炭酸エステル；プロピオン酸メチル、酪酸メチル等のカルボン酸エステル；γ－ブチルラクトン、スルホラン、２－メチルテトラヒドロフラン、ジメトキシエタン等のエーテル類等を使用することができる。これらの非水溶媒は単独で使用してもよく、複数種を混合して使用してもよい。これらの中でも、非水溶媒として特に炭酸エステルを用いることが酸化安定性の点から好ましい。また、非水電解液には必要に応じて種々の添加剤を添加してもよい。 The nonaqueous electrolytic solution is prepared by dissolving an electrolyte in a nonaqueous solvent. As the electrolyte, for example, a solution obtained by dissolving LiPF 6 in a nonaqueous solvent at a concentration of 1.0 mol / L is used. As an electrolyte other than LiPF 6 , lithium salts such as LiBF 4 , LiAsF 6 , LiClO 4 , LiCF 3 SO 3 , LiN (SO 2 CF 3 ) 2 , LiC (SO 2 CF 3 ) 3 , LiAlCl 4 , LiSiF 6 are used. Can be mentioned. Among these, it is preferable from the viewpoint of oxidation stability that LiPF 6 or LiBF 4 is used as the electrolyte. Such an electrolyte is preferably used by being dissolved in a non-aqueous solvent at a concentration of 0.1 mol / L to 3.0 mol / L, and is preferably dissolved at a concentration of 0.5 mol / L to 2.0 mol / L. More preferably, it is used. As the non-aqueous solvent, for example, a mixture of propylene carbonate, ethylene carbonate and diethyl carbonate in a volume ratio of 5 to 20:20 to 30:60 to 70 is used. Other non-aqueous solvents include: cyclic carbonates such as propylene carbonate and ethylene carbonate; chain carbonates such as diethyl carbonate and dimethyl carbonate; carboxylic acid esters such as methyl propionate and methyl butyrate; γ-butyllactone, sulfolane, Ethers such as 2-methyltetrahydrofuran and dimethoxyethane can be used. These non-aqueous solvents may be used alone or in combination of two or more. Among these, it is preferable from the point of oxidation stability to use carbonate ester as a non-aqueous solvent. Moreover, you may add various additives to a non-aqueous electrolyte as needed.
　今回開示された実施の形態はすべての点で例示であって制限的なものではないと考慮されるべきである。本発明の範囲は以上の実施の形態ではなく、特許請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての修正と変形を含むものであることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above embodiments but by the scope of the claims, and is intended to include all modifications and variations within the meaning and scope equivalent to the scope of the claims.
　本発明の蓄電デバイス組立構造体によれば、集電抵抗を低減させることができるとともに、蓄電デバイス同士の接続を容易に行うことが可能になる。また、本発明の蓄電デバイス単位構造体によれば、外部接続用端子によって蓄電デバイスを外部端子と電気的に容易に接続することが可能になる。したがって、本発明は、リチウムイオン二次電池、リチウム二次電池、ポリマー二次電池、有機ラジカル電池、全固体電池、電気二重層キャパシタなどの蓄電要素を、可撓性を有する外包部材を用いて収容する蓄電デバイスを複数個、電気的に接続して構成するのに有用である。 According to the electricity storage device assembly structure of the present invention, it is possible to reduce the current collecting resistance and easily connect the electricity storage devices. Moreover, according to the electricity storage device unit structure of the present invention, the electricity storage device can be easily electrically connected to the external terminal by the external connection terminal. Therefore, the present invention uses a flexible outer packaging member for power storage elements such as a lithium ion secondary battery, a lithium secondary battery, a polymer secondary battery, an organic radical battery, an all-solid battery, and an electric double layer capacitor. This is useful for electrically connecting a plurality of power storage devices to be accommodated.
　１：電池パック、１０：単位電池、１１：電池要素、１２：外包部材、１３：正極接続用端子、１４：負極接続用端子、１５：中継部材、１５１：湾曲部、１６：外部接続用端子、１７：容器部材、２０：連結部材、２１：締結部材、１６１：連結平面、１７１：フレーム部材、１７２：蓋部材、１７２ａ：上蓋部材、１７２ｂ：下蓋部材。

                                                                                 1: battery pack, 10: unit battery, 11: battery element, 12: outer packaging member, 13: positive electrode connection terminal, 14: negative electrode connection terminal, 15: relay member, 151: curved portion, 16: external connection terminal , 17: container member, 20: coupling member, 21: fastening member, 161: coupling plane, 171: frame member, 172: lid member, 172a: upper lid member, 172b: lower lid member.

Claims (17)

  1. 　複数の蓄電デバイスを電気的に接続して構成される蓄電デバイス組立構造体であって、
    　複数の蓄電デバイス単位構造体と、
    　前記複数の蓄電デバイス単位構造体を電気的に連結する連結部材とを備え、
    　前記蓄電デバイス単位構造体が、
    　蓄電要素を収容する可撓性の外包部材と、
    　前記蓄電要素に電気的に接続されて前記外包部材から外側に導出された正極接続用端子および負極接続用端子と、
    　前記正極接続用端子および前記負極接続用端子のそれぞれに電気的に接続された外部接続用端子とを含み、
    　前記外部接続用端子が、前記正極接続用端子および前記負極接続用端子の主平面と交差する方向に延在する連結平面を有し、かつ、前記外部接続用端子の連結平面にて前記連結部材と連結される、蓄電デバイス組立構造体。     An electrical storage device assembly structure configured by electrically connecting a plurality of electrical storage devices,
    A plurality of power storage device unit structures;
    A connecting member that electrically connects the plurality of power storage device unit structures,
    The electricity storage device unit structure is
    A flexible outer member that houses the electricity storage element;
    A positive connection terminal and a negative connection terminal electrically connected to the power storage element and led out from the outer packaging member;
    An external connection terminal electrically connected to each of the positive electrode connection terminal and the negative electrode connection terminal;
    The external connection terminal has a connection plane extending in a direction intersecting with a main plane of the positive connection terminal and the negative connection terminal, and the connection member is connected to the connection plane of the external connection terminal. An electricity storage device assembly structure coupled to the device.
  2. 　前記連結部材が、前記複数の蓄電デバイス単位構造体を厚み方向に積み重ねることにより直列および／または並列に連結する、請求項１に記載の蓄電デバイス組立構造体。 2. The power storage device assembly structure according to claim 1, wherein the connection member connects the plurality of power storage device unit structures in a thickness direction to connect them in series and / or in parallel.
  3. 　前記連結部材が、取り外し可能な固定手段で前記外部接続用端子を連結する、請求項１または請求項２に記載の蓄電デバイス組立構造体。 The electric storage device assembly structure according to claim 1 or 2, wherein the connecting member connects the external connection terminals with a detachable fixing means.
  4. 　前記固定手段が、ボルト・ナット、ネジおよびピンからなる群より選ばれた一種である、請求項３に記載の蓄電デバイス組立構造体。 The electric storage device assembly structure according to claim 3, wherein the fixing means is a kind selected from the group consisting of bolts, nuts, screws, and pins.
  5. 　前記外部接続用端子が、板状材を折り曲げることにより形成された前記連結平面を有する、請求項１から請求項４までのいずれか１項に記載の蓄電デバイス組立構造体。 The electrical storage device assembly structure according to any one of claims 1 to 4, wherein the external connection terminal has the connecting plane formed by bending a plate-like material.
  6. 　前記外部接続用端子が、前記正極接続用端子および前記負極接続用端子よりも大きい厚みを有する、請求項１から請求項５までのいずれか１項に記載の蓄電デバイス組立構造体。 The electric storage device assembly structure according to any one of claims 1 to 5, wherein the external connection terminal has a larger thickness than the positive electrode connection terminal and the negative electrode connection terminal.
  7. 　前記外部接続用端子が、前記正極接続用端子および前記負極接続用端子のそれぞれの両側に配置された前記連結平面を有する、請求項１から請求項６までのいずれか１項に記載の蓄電デバイス組立構造体。 The power storage device according to any one of claims 1 to 6, wherein the external connection terminal has the connection plane disposed on both sides of the positive electrode connection terminal and the negative electrode connection terminal. Assembly structure.
  8. 　前記正極接続用端子および前記負極接続用端子のそれぞれと前記外部接続用端子とは、レーザー溶接によって電気的に接続されている、請求項１から請求項７までのいずれか１項に記載の蓄電デバイス組立構造体。 The electrical storage according to any one of claims 1 to 7, wherein each of the positive electrode connection terminal and the negative electrode connection terminal and the external connection terminal are electrically connected by laser welding. Device assembly structure.
  9. 　前記蓄電デバイス単位構造体が、前記外包部材と前記正極接続用端子および前記負極接続用端子を収容する容器部材を含み、前記外部接続用端子が前記容器部材から外側に導出されている、請求項１から請求項８までのいずれか１項に記載の蓄電デバイス組立構造体。 The power storage device unit structure includes a container member that accommodates the outer packaging member, the positive electrode connection terminal, and the negative electrode connection terminal, and the external connection terminal is led out from the container member. The electrical storage device assembly structure according to any one of claims 1 to 8.
  10. 　前記容器部材が、合成樹脂製のフレーム部材と、金属製の蓋部材とを含む、請求項９に記載の蓄電デバイス組立構造体。 The electrical storage device assembly structure according to claim 9, wherein the container member includes a frame member made of synthetic resin and a metal lid member.
  11. 　前記蓋部材が上蓋部材と下蓋部材とを含み、前記上蓋部材と前記下蓋部材とが互いに係合することにより前記フレーム部材の少なくとも一部を覆うように構成されている、請求項１０に記載の蓄電デバイス組立構造体。 The cover member includes an upper cover member and a lower cover member, and the upper cover member and the lower cover member are configured to cover at least a part of the frame member by engaging with each other. The electricity storage device assembly structure described.
  12. 　前記容器部材が絶縁性を有し、
    　前記外包部材が、少なくとも熱可塑性樹脂からなる内面層と、前記内面層の外側に配置される金属層とを含み、前記内面層を熱溶着することにより前記蓄電要素が封止されるように構成されており、
    　前記正極接続用端子および前記負極接続用端子が前記熱溶着された前記内面層から外側に導出されている、請求項９に記載の蓄電デバイス組立構造体。     The container member has insulating properties;
    The outer packaging member includes at least an inner surface layer made of a thermoplastic resin and a metal layer disposed outside the inner surface layer, and the power storage element is sealed by thermally welding the inner surface layer. Has been
    The electrical storage device assembly structure according to claim 9, wherein the positive electrode connection terminal and the negative electrode connection terminal are led out from the thermally welded inner surface layer.
  13. 　前記正極接続用端子および前記負極接続用端子が、前記外包部材の外周縁から互いに対向する方向に導出されている、請求項１から請求項１２までのいずれか１項に記載の蓄電デバイス組立構造体。 The power storage device assembly structure according to any one of claims 1 to 12, wherein the positive electrode connection terminal and the negative electrode connection terminal are led out from an outer peripheral edge of the outer packaging member in a direction facing each other. body.
  14. 　前記蓄電デバイス単位構造体が、
    　前記正極接続用端子と前記外部接続用端子との間を電気的に接続する中継部材を含む、請求項１から請求項１３までのいずれか１項に記載の蓄電デバイス組立構造体。     The electricity storage device unit structure is
    The power storage device assembly structure according to any one of claims 1 to 13, further comprising a relay member that electrically connects the positive electrode connection terminal and the external connection terminal.
  15. 　前記正極接続用端子と前記中継部材との接続部分には湾曲部が形成されている、請求項１４に記載の蓄電デバイス組立構造体。 The power storage device assembly structure according to claim 14, wherein a curved portion is formed at a connection portion between the positive electrode connection terminal and the relay member.
  16. 　前記湾曲部に超音波溶着部が形成されている、請求項１５に記載の蓄電デバイス組立構造体。 The electrical storage device assembly structure according to claim 15, wherein an ultrasonic weld is formed in the curved portion.
  17. 　蓄電要素を収容する可撓性の外包部材と、
    　前記蓄電要素に電気的に接続されて前記外包部材から外側に導出された正極接続用端子および負極接続用端子と、
    　前記正極接続用端子および前記負極接続用端子のそれぞれに電気的に接続された外部接続用端子とを備え、
    　前記外部接続用端子が、前記正極接続用端子および前記負極接続用端子の主平面と交差する方向に延在し、かつ、外部端子と電気的に接続される接続平面を有する、蓄電デバイス単位構造体。
                                                                                         A flexible outer member that houses the electricity storage element;
    A positive connection terminal and a negative connection terminal electrically connected to the power storage element and led out from the outer packaging member;
    An external connection terminal electrically connected to each of the positive electrode connection terminal and the negative electrode connection terminal;
    The electric storage device unit structure, wherein the external connection terminal has a connection plane extending in a direction intersecting with a main plane of the positive electrode connection terminal and the negative electrode connection terminal and electrically connected to the external terminal body.
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