WO2014068740A1 - Unité de cellule - Google Patents

Unité de cellule Download PDF

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Publication number
WO2014068740A1
WO2014068740A1 PCT/JP2012/078277 JP2012078277W WO2014068740A1 WO 2014068740 A1 WO2014068740 A1 WO 2014068740A1 JP 2012078277 W JP2012078277 W JP 2012078277W WO 2014068740 A1 WO2014068740 A1 WO 2014068740A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode terminal
negative electrode
positive electrode
battery
unit
Prior art date
Application number
PCT/JP2012/078277
Other languages
English (en)
Japanese (ja)
Inventor
尚貴 木村
心 ▲高▼橋
玲緒 小林
栄二 關
Original Assignee
株式会社 日立製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社 日立製作所 filed Critical 株式会社 日立製作所
Priority to PCT/JP2012/078277 priority Critical patent/WO2014068740A1/fr
Publication of WO2014068740A1 publication Critical patent/WO2014068740A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the bus bar is a metal, which causes an increase in weight and cost.
  • the present invention provides battery units that can be connected in series or in parallel without using a bus bar and without using joining or welding with fasteners such as bolts.
  • a battery unit in which a plurality of unit cells including a battery can accommodating a positive electrode, a negative electrode, and a separator, and a positive electrode terminal and a negative electrode terminal protruding from the battery case are stacked and electrically connected to each other
  • the positive electrode terminal and the negative electrode terminal of the unit cells arranged are in contact with each other by a plane perpendicular to the stacking direction of the unit cells, forming a terminal contact portion, and the plurality of unit cells
  • the present invention can provide a low cost and lightweight battery unit. Problems, configurations, and effects other than those described above will be apparent from the description of the embodiments below.
  • FIG. 1 shows a perspective view of the appearance of the unit cell 25. As shown in FIG. 1
  • the unit cell 25 includes a battery can 6 and a battery lid 12.
  • the winding group 3 is housed in the battery can 6, and the upper opening of the battery can is sealed by the battery lid 12.
  • the battery lid 12 is welded to the battery can 6 by laser welding, and the battery can 6 and the battery lid 12 constitute a battery case.
  • the battery cover 6 is provided with a positive electrode terminal 19 and a negative electrode terminal 20. The winding group 3 is charged via the positive electrode terminal 19 and the negative electrode terminal 20, and power is supplied to the external load.
  • a pressure release valve 17 is integrally provided on the battery lid 12, and when the pressure in the battery container rises, the pressure release valve 17 is opened to discharge gas from the inside, and the pressure in the battery container is reduced. Thereby, the safety of the unit cell 25 is secured.
  • the positive electrode terminal 19 and the negative electrode terminal 20 have terminal structures directed in different directions in the thickness direction of the battery.
  • FIG. 2 is an exploded perspective view of a prismatic secondary battery according to the present embodiment.
  • the cells 25 are respectively connected to the positive and negative electrode current collectors 9 and 10 connected to the winding group 8 and penetrate the battery cover 12 in a state of being electrically insulated by the gasket 11 and the insulating ring 13
  • Other electrolytes include, for example, ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, ⁇ -butyrolactone, ⁇ -valerolactone, methyl acetate, ethyl acetate, methyl propionate, tetrahydrofuran, 2 -Methyltetrahydrofuran, 1,2-dimethoxyethane, 1-ethoxy-2-methoxyethane, 3-methyltetrahydrofuran, 1,2-dioxane, 1,3-dioxane, 1,4-dioxane, 1,3-dioxolane, 2
  • Non-aqueous solvents selected from at least one or more selected from, for example, LiPF 6 , LiBF 4
  • FIG. 3 is an exploded perspective view of the winding group 8.
  • the strip-shaped positive electrode 3 and the strip-shaped negative electrode 5 are wound via the strip-shaped two separators 4.
  • the positive electrode uncoated portion 2 and the negative electrode uncoated portion 1 are wound in an oval shape in cross section so as to be positioned on both end surfaces of the wound group.
  • the uncoated parts 1 and 2 are arranged on the opposite side to each other.
  • the positive electrode 3 constituting the winding group 8 has an aluminum foil as a positive electrode current collector foil. On both sides of the aluminum foil, Li Ni 1/3 Co 1/3 Mn 1/3 O 2 of lithium-containing transition metal double oxide was used as a positive electrode active material. Besides, various lithium transition metal complex oxides can be used for the positive electrode active material of the lithium ion secondary battery. For example, it is possible to replace part of Ni, Co, Mn, and the like of the positive electrode active material such as lithium nickelate, lithium cobaltate, and lithium manganate with one or more transition metals.
  • a conductive material of a carbon material and a binder (binder) of polyvinylidene fluoride hereinafter abbreviated as PVDF
  • the negative electrode active material mixture other than the negative electrode active material, acetylene black or graphite was used as a conductive material, and a PVDF binder was further used.
  • the viscosity is adjusted with a dispersion solvent such as NMP.
  • the width (length in the direction of WH) of the coated portion of the negative electrode active material mixture is such that the coated portion of the positive electrode active material mixture protrudes from the coated portion of the negative electrode active material mixture in the longitudinal direction of the wound group In order to prevent this, the width is set to be longer than the width of the coated portion of the positive electrode active material mixture.
  • FIG. 4 is an external appearance perspective view of the battery unit.
  • a battery unit can be configured by stacking a plurality of unit cells 25 each having a rectangular case.
  • the shape of the terminal for stacking the unit cells 25 is not particularly limited, but a shape such as a crank type (chair type) or an L shape can be used.
  • a crank-type terminal having a larger number of bends as shown in FIGS. 1 and 4 rather than simply making it L-shaped, it is possible to withstand a change in size or a positional deviation due to a stress in the stacking direction.
  • the shape of the terminal is a crank type.
  • the L-shaped shape has the advantage of being easy to manufacture.
  • the terminals connected in series are in contact with each other perpendicularly to the stacking direction of the unit cells 25 and in parallel to the stacking surface.
  • the contact surface of the terminal contact portion 28 formed by the contact between the positive electrode terminal 19 and the negative electrode terminal 20 is preferably a surface parallel to the lamination surface of the unit cell. This is because when the terminals connected in series have a plane perpendicular to the stacking direction of the unit cells and parallel to the stacking surface of the unit cells, the stress in the stacking direction caused by the stacking of the unit cells 25 This is because the terminal 19 and the negative electrode terminal 20 can be crimped together, which is structurally efficient in manufacturing. Moreover, it is because fixation of the insulating block 21 mentioned later becomes easy, and productivity improves.
  • FIG. 5 is an external appearance perspective view of the battery unit having the insulating block 21.
  • a terminal contact portion 28 in which the positive electrode terminal 19 and the negative electrode terminal 20 are combined is formed between the cells 25.
  • the contact between the positive electrode terminal 19 and the negative electrode terminal 20 is assisted.
  • the positive electrode terminal 19 and the negative electrode terminal 20 can be pressure-bonded by the external stress 24 in the thickness direction of the unit cell 25, and the contact between the positive electrode terminal 19 and the negative electrode terminal 20 can be made reliable.
  • the external stress 24 can be generated, for example, by putting the battery unit of FIG. 5 in a case and tightening it from the outside, or by providing a fastener and tightening.
  • the external stress 24 is preferably within a range that can be handled by securing the battery unit, and is preferably 1 kPa or more and 10 MPa or less. In particular, 0.1 MPa or more and 2 MPa or less is the most preferable.
  • bonded is the terminals mutually connected at least in series or parallelly, single cells may also be crimped
  • metal blocks 22 and 23 can be provided on the positive electrode terminal 19 and the negative electrode terminal 20 of the outermost cell 25 respectively.
  • the insulating block 21, the metal blocks 22 and 23, and the positive and negative electrode terminals 19 and 20 can be integrated and connected in series by the external stress 24.
  • the insulating block 21 is not particularly limited as long as it is an insulator, but a material excellent in heat dissipation, for example, a resin such as insulating epoxy or silicone, a metal oxide such as alumina or magnesium oxide, or these oxides or insulators It is preferable to use an insulating metal such as a metal coated with a conductive resin or the like, a Peltier element, or the like.
  • a material excellent in heat dissipation for the insulating block 21 the heat generated inside the unit cell 25 and transferred to the terminal portion can be efficiently dissipated from the insulating block 21.
  • a refrigerant can be disposed to further circulate the refrigerant.
  • a space is formed by the insulating block near the pressure release valve 17 of the battery unit.
  • the insulating block can be used as a gas discharge path.
  • a voltage detection mechanism may be provided in the insulating block, and a voltage monitor of single cells connected in series may be installed.
  • Negative electrode uncoated portion 2 Positive electrode uncoated portion 3: Positive electrode 4: Separator 5: Negative electrode 6: Battery can 7: Insulating sheet 8: Winding group 9: Positive electrode current collector plate 10: Negative electrode current collector plate 11: Gasket 12: Battery cover 13: Insulating ring 14: Positive electrode rivet 15: Negative electrode rivet 16: Liquid injection plug 17: Pressure release valve 18: Liquid injection port 19: Positive electrode terminal 20: Negative electrode terminal 21: Insulating block 22: Outermost single cell Positive electrode side metal block 23: outermost single cell negative electrode side metal block 24: external stress 25: single cell 26: battery unit A in which four single cells are connected in series 27: Battery unit B in which four single cells are connected in series 28: Terminal contact portion

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention se rapporte à une unité de cellule qui peut être raccordée en série ou en parallèle sans utiliser une barre omnibus et sans soudure ou liaison à l'aide d'un outil de fixation tel qu'un boulon. La caractéristique de la présente invention est, par exemple, la suivante. La présente invention porte sur une unité de cellule dans laquelle une pluralité de cellules individuelles comprenant un boîtier de cellule qui contient une électrode positive, une électrode négative et un séparateur ainsi qu'une borne d'électrode positive et une borne d'électrode négative qui font saillie du boîtier de cellule, sont empilées et électriquement raccordées les unes aux autres ; la borne d'électrode positive et la borne d'électrode négative des cellules individuelles qui sont agencées de façon adjacente les unes aux autres, étant en contact l'une avec l'autre au niveau d'une surface perpendiculaire à la direction dans laquelle sont empilées les cellules individuelles, ce qui forme une partie de contact de borne ; un bloc isolant étant agencé entre une pluralité de parties de connexion de borne formées par l'empilement d'une pluralité de cellules individuelles ; et le bloc isolant étant en contact avec les parties de connexion de borne. La présente invention peut, de ce fait, fournir une unité de cellule bon marché et légère.
PCT/JP2012/078277 2012-11-01 2012-11-01 Unité de cellule WO2014068740A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/078277 WO2014068740A1 (fr) 2012-11-01 2012-11-01 Unité de cellule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/078277 WO2014068740A1 (fr) 2012-11-01 2012-11-01 Unité de cellule

Publications (1)

Publication Number Publication Date
WO2014068740A1 true WO2014068740A1 (fr) 2014-05-08

Family

ID=50626706

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/078277 WO2014068740A1 (fr) 2012-11-01 2012-11-01 Unité de cellule

Country Status (1)

Country Link
WO (1) WO2014068740A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110291658A (zh) * 2017-02-03 2019-09-27 罗伯特·博世有限公司 电池单元和电池模块
CN110429234A (zh) * 2019-07-05 2019-11-08 恒大新能源科技集团有限公司 一种无汇流排电池模组结构及组装方法
CN110537268A (zh) * 2017-04-20 2019-12-03 A123系统有限责任公司 电池触片配置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006210312A (ja) * 2004-10-26 2006-08-10 Nissan Motor Co Ltd 組電池
JP2008146943A (ja) * 2006-12-07 2008-06-26 Nissan Motor Co Ltd 組電池およびその製造方法
JP2008147047A (ja) * 2006-12-11 2008-06-26 Nissan Motor Co Ltd 電池モジュール
JP2010282767A (ja) * 2009-06-03 2010-12-16 Honda Motor Co Ltd 組電池モジュール

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006210312A (ja) * 2004-10-26 2006-08-10 Nissan Motor Co Ltd 組電池
JP2008146943A (ja) * 2006-12-07 2008-06-26 Nissan Motor Co Ltd 組電池およびその製造方法
JP2008147047A (ja) * 2006-12-11 2008-06-26 Nissan Motor Co Ltd 電池モジュール
JP2010282767A (ja) * 2009-06-03 2010-12-16 Honda Motor Co Ltd 組電池モジュール

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110291658A (zh) * 2017-02-03 2019-09-27 罗伯特·博世有限公司 电池单元和电池模块
CN110537268A (zh) * 2017-04-20 2019-12-03 A123系统有限责任公司 电池触片配置
CN110537268B (zh) * 2017-04-20 2023-04-04 A123系统有限责任公司 电池触片配置
CN110429234A (zh) * 2019-07-05 2019-11-08 恒大新能源科技集团有限公司 一种无汇流排电池模组结构及组装方法

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