WO2018079165A1 - Batterie secondaire empilée et son procédé de production - Google Patents

Batterie secondaire empilée et son procédé de production Download PDF

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Publication number
WO2018079165A1
WO2018079165A1 PCT/JP2017/034857 JP2017034857W WO2018079165A1 WO 2018079165 A1 WO2018079165 A1 WO 2018079165A1 JP 2017034857 W JP2017034857 W JP 2017034857W WO 2018079165 A1 WO2018079165 A1 WO 2018079165A1
Authority
WO
WIPO (PCT)
Prior art keywords
positive electrode
negative electrode
battery
electrode tab
bus bar
Prior art date
Application number
PCT/JP2017/034857
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English (en)
Japanese (ja)
Inventor
竜治 河野
繁貴 坪内
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
Publication of WO2018079165A1 publication Critical patent/WO2018079165A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a stacked secondary battery and a method for manufacturing the same.
  • Patent Literature 1 As a technique for connecting stacked battery cells in series.
  • the assembled battery 50 includes a plurality of battery cells 20A to 20D connected in series.
  • the electrode tab 25a from the battery cell 20A is joined to the upper surface of the bus bar 41, and the electrode tab 25b from the battery cell 20B is joined to the side surface of the bus bar.
  • the bus bar 41 is joined to one electrode tab 25a in the state of the battery cell 20 alone.
  • a technique is disclosed in which the electrode tab 25b and the side surface of the bus bar are joined in a state where the battery cells with bus bars are overlapped.
  • An object of the present invention is to reduce the volume loss of a stacked secondary battery.
  • the battery unit has a plurality of battery units and bus bars, the battery unit has a positive electrode, a negative electrode, and an electrolyte layer, the positive electrode has a positive electrode tab, the negative electrode has a negative electrode tab, and the positive electrode tabs and the negative electrode in the battery unit The tabs are joined together, and the electrode body composed of the positive electrode, the electrolyte layer, and the negative electrode is laminated to form a parallel connection in the battery unit, the plurality of battery units are laminated, and the plurality of battery units are connected in series.
  • One positive electrode tab and the other negative electrode tab of the battery units adjacent in the stacking direction have a joint with the bus bar, and the positive tab and the joint of the bus bar and the negative tab and the joint of the bus bar are in the stacking direction. Stacked secondary batteries that are lined up.
  • the volume loss of the stacked secondary battery can be reduced.
  • FIG. 1 is a schematic diagram of a stacked secondary battery according to an embodiment of the present invention. It is a schematic diagram of the battery unit which concerns on one Embodiment of this invention. It is a schematic diagram of the battery unit which concerns on one Embodiment of this invention. It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention. It is a manufacturing process of the laminated type secondary battery which concerns on one Embodiment of this invention.
  • FIG. 1 is a schematic view of a stacked secondary battery according to an embodiment of the present invention.
  • the stacked secondary battery 2000 includes a plurality of battery units 1000 and a bus bar 600.
  • the plurality of battery units 1000 are stacked.
  • Each of the plurality of battery units 1000 includes a negative electrode tab 154 and a positive electrode tab 254.
  • the direction in which the plurality of battery units 1000 are stacked is defined as the stacking direction, and the direction in the vertical plane in the stacking direction is defined as the in-plane direction.
  • the negative electrode tab 154 of one battery unit 1000 and the positive electrode tab 254 of the other battery unit 1000 are ultrasonically bonded together with the bus bar 600, and the negative electrode tab 154, the bus bar 600, and the positive electrode tab.
  • the plurality of battery units 1000 are electrically connected in series in the stacking direction by H.254.
  • the positive electrode tab 254 or the negative electrode tab 154 may be referred to as an electrode tab.
  • the plurality of battery units 1000 are housed in the case 3000.
  • a connection terminal 4000 is formed above the uppermost battery unit 1000 of the plurality of battery units 1000.
  • a connection terminal is also formed below the lowermost battery unit 1000 of the plurality of battery units 1000 (not shown), and the uppermost connection terminal 4000 of a certain stacked secondary battery 2000 and another stacked secondary battery. Adjacent stacked secondary batteries 2000 can be connected in series by connecting the lowermost connection terminals of the battery 2000.
  • the positive electrode tab of the uppermost battery unit 1000 is ultrasonically bonded to an aluminum alloy connection plate 5000 disposed above the uppermost battery unit 1000.
  • the negative electrode tab of the lowermost battery unit 1000 among the plurality of battery units 1000 is ultrasonically bonded to a copper alloy connection plate 6000 disposed below the lowermost battery unit 1000.
  • FIG. 2 is a schematic diagram of a battery unit according to an embodiment of the present invention.
  • the battery unit 1000 is configured by wrapping a laminated body of a plurality of electrode bodies 400 in an exterior body 500.
  • the outer periphery of the electrode body 400 is covered with the exterior body 500 that is an insulating member.
  • the exterior body 500 may be a resin box provided with an opening for accommodating a laminated body of a plurality of electrode bodies 400 as shown in FIG. 2, or may be one in which an insulating film is circulated.
  • FIG. 3 is a schematic diagram of a battery unit according to an embodiment of the present invention.
  • the battery unit 1000 includes a positive electrode 250, an electrolyte layer 300, and a negative electrode 150.
  • the positive electrode 250 or the negative electrode 150 may be referred to as an electrode.
  • the positive electrode 250 has a positive electrode mixture layer 251 and two positive electrode current collectors 252.
  • the positive electrode mixture layer 251 is formed on both surfaces of the positive electrode current collector 252.
  • the negative electrode 150 includes a negative electrode mixture layer 151 and a negative electrode current collector 152.
  • the negative electrode mixture layer 151 is formed on both surfaces of the negative electrode current collector 152.
  • the positive electrode 250, the electrolyte layer 300, and the negative electrode 150 are laminated
  • a plurality of electrode bodies 400 are stacked, and the positive electrode current collectors 252 and the negative electrode current collectors 152 in the electrode bodies 400 are connected to each other, so that the battery unit 1000 is electrically connected in parallel.
  • a plurality of electrode bodies 400 are stacked to form a battery unit 1000.
  • the positive electrode mixture layer 251 contains at least a positive electrode active material capable of inserting and extracting Li.
  • the positive electrode active material include LiCo composite oxides, LiNi composite oxides, LiMn composite oxides, Li—Co—Ni—Mn composite oxides, LiFeP composite oxides, and the like.
  • a solid electrolyte for ensuring ionic conductivity may be included.
  • the material contained in the positive electrode mixture layer 251 is dissolved in a solvent to form a slurry, which is applied onto the positive electrode current collector 252.
  • the coating method is not particularly limited, and for example, a conventional method such as a doctor blade method, a dipping method, or a spray method can be used.
  • the positive electrode mixture layer 251 is formed through a drying process for removing the solvent and a pressing step for ensuring electron conductivity and ion conductivity in the positive electrode mixture layer 251.
  • the positive electrode current collector 252 has a positive electrode coating part 253 and a positive electrode tab 254.
  • a positive electrode mixture layer 251 is formed on the positive electrode coating portion 253.
  • the positive electrode mixture layer 251 is not formed on the positive electrode tab 254.
  • the positive electrode tab 254 is arranged to take out the generated electricity to the outside, and protrudes from one side of the positive electrode 250. In FIG. 3, the positive electrode tab 254 protrudes in the same direction as a negative electrode tab 154 described later. Since the positive electrode tab 254 and the negative electrode tab 154 protrude in the same direction, the area occupied by the positive electrode tab 254 and the negative electrode tab 154 in the battery unit 1000 can be reduced, and the energy density of the battery unit 1000 can be improved.
  • Each positive electrode tab 254 in the battery unit 1000 is overlapped when the battery unit 1000 is viewed from the stacking direction.
  • the plurality of positive electrode tabs 254 in the battery unit 1000 are bonded by, for example, ultrasonic bonding.
  • other battery units 1000 do not interfere with each other during ultrasonic bonding.
  • the connection reliability is high.
  • a plurality of positive electrode tabs 254 in adjacent battery units 1000 are overlapped when the battery units 1000 are viewed from the stacking direction.
  • the plurality of positive electrode tabs 254 in the adjacent battery units 1000 (or the plurality of positive electrode tabs 254 and the plurality of negative electrode tabs 154) are overlapped when the battery unit 1000 is viewed from the stacking direction, whereby the battery unit 1000 is made of resin.
  • each battery unit 1000 can be stored in the same resin molded body.
  • the positive electrode current collector 252 an aluminum foil, an aluminum perforated foil having a hole diameter of 0.1 to 10 mm, an expanded metal, a foamed aluminum plate, or the like is used.
  • the material stainless steel, titanium, or the like can be applied in addition to aluminum.
  • the thickness of the positive electrode current collector 252 is preferably 10 nm to 1 mm. From the viewpoint of achieving both the energy density of the all solid state battery and the mechanical strength of the electrode, about 1 to 100 ⁇ m is desirable.
  • the negative electrode mixture layer 151 contains at least a negative electrode active material capable of inserting and extracting Li.
  • the negative electrode active material include carbon-based materials such as natural graphite, soft carbon, and amorphous carbon, Si metal, Si alloy, lithium titanate, and lithium metal.
  • a conductive material responsible for electronic conductivity in the negative electrode mixture layer 151, a binder for ensuring adhesion between the materials in the negative electrode mixture layer 151, and further in the negative electrode mixture layer 151 A solid electrolyte for ensuring ionic conductivity may be included.
  • the material contained in the negative electrode mixture layer 151 is dissolved in a solvent to form a slurry, which is coated on the negative electrode current collector 152.
  • the coating method is not particularly limited, and for example, a conventional method such as a doctor blade method, a dipping method, or a spray method can be used. Thereafter, the negative electrode mixture layer 151 is formed through a drying process for removing the solvent and a pressing process for ensuring the electron conductivity and ion conductivity in the negative electrode mixture layer 151.
  • the negative electrode current collector 152 has a negative electrode coating part 153 and a negative electrode tab 154.
  • the configurations of the negative electrode coating portion 153 and the negative electrode tab 154 are substantially the same as the configurations of the positive electrode coating portion 253 and the positive electrode tab 254.
  • the negative electrode current collector 152 a copper foil, a copper perforated foil having a hole diameter of 0.1 to 10 mm, an expanded metal, a foamed copper plate, or the like is used. In addition to copper, stainless steel, titanium, nickel, or the like can be applied.
  • the thickness of the negative electrode current collector 152 is preferably 10 nm to 1 mm. From the viewpoint of achieving both the energy density of the all solid state battery and the mechanical strength of the electrode, about 1 to 100 ⁇ m is desirable.
  • the electrolyte layer 300 includes a solid electrolyte.
  • solid electrolytes include organic compounds such as sulfides such as Li 10 Ge 2 PS 12 and Li 2 S—P 2 S 5 , oxides such as Li—La—Zr—O, ionic liquids and room temperature molten salts. Examples thereof include materials that do not exhibit fluidity within the operating temperature range of an all-solid battery, such as a polymer type supported on inorganic particles, a semi-solid electrolyte, and the like.
  • the electrolyte layer 300 is formed by compressing powder, mixing with a binder, applying a slurryed solid electrolyte layer to a release material, or impregnating a carrier.
  • the thickness of the electrolyte layer 300 is several nanometers to several millimeters from the viewpoint of ensuring the energy density of the all-solid-state battery and ensuring electronic insulation.
  • FIG. 4 and 5 are a part of the manufacturing process of the laminated secondary battery according to the embodiment of the present invention.
  • FIG. 5 is a diagram of the stacked secondary battery after ultrasonic bonding in FIG. 4 and 5, the bus bar 600 is formed on the negative electrode tab 154 and the positive electrode tab 254.
  • the negative electrode tab 154 and the positive electrode tab 254 are not in contact with each other in the in-plane direction, and the negative electrode tab 154 and the bus bar 600, and the positive electrode tab 254 and the bus bar 600 are in contact with each other in the stacking direction.
  • the bus bar 600 is supported by the anvil 610, and the horn 620 is brought close to the contact portion between the positive electrode tab 254 and the bus bar 600, and the horn 620 is vibrated with ultrasonic waves to join the positive electrode tab 254 and the bus bar 600
  • the contact portion between the negative electrode tab 154 and the bus bar 600 is brought close to the horn 620, and the horn 620 is vibrated with ultrasonic waves to join the negative electrode tab 154 and the bus bar 600 together.
  • all the electrode bodies 400 can be unified into the comparatively same shape. Further, by connecting the battery units 1000 in series via the bus bar 600, the productivity of the stacked secondary battery 2000 can be improved as compared with the case where the current collectors are stacked and bundled.
  • the number of joints between the positive electrode tab 254 and the bus bar 600 and the number of joints between the negative electrode tab 154 and the bus bar 600 are two, but may be one.
  • optimum ultrasonic welding for each of the negative electrode tab 154 and the positive electrode tab 254 can be controlled.
  • the bus bar 600 aluminum, an aluminum alloy, copper, a copper alloy, a clad material of aluminum and copper, or the like can be used.
  • a clad material of aluminum and copper as the bus bar 600, the above-described optimum ultrasonic welding can be controlled.
  • the bus bar 600 is formed on the negative electrode tab 154 and the positive electrode tab 254, but the bus bar 600 may be formed below the negative electrode tab 154 and the positive electrode tab 254.
  • the bus bar 600 is formed on the negative electrode tab 154 and the positive electrode tab 254, when one battery unit 1000 of the battery units 1000 connected in series is reversed and stacked on the other battery unit 1000, the in-plane direction In this case, the bus bar 600 is formed between the electrode tab and the battery unit 1000. Thereby, the bus bar 600 can prevent a short circuit when the electrode tab contacts the battery unit 1000.
  • FIGS. 6E and 6F are the same as FIGS. 6A and 6B. As described above, three battery units 1000 connected in series are stacked as shown in FIG. By repeating the steps of FIG. 6A to FIG. 6F, the multilayer secondary battery 2000 of FIG. 1 is configured.
  • the connecting portion of the negative electrode tab 154 and the bus bar 600 and the connecting portion of the positive electrode tab 254 and the bus bar 600 are arranged in the stacking direction. Therefore, compared with the case where two connection parts are formed in the upper surface and side surface of a bus bar, the dead space by an electrode tab can be made small and the volume loss of the laminated type secondary battery 2000 can be made small.
  • Electrode layer 400 Electrode layer 500 Exterior body 600 Bus bar 610 Anvil 620 Horn 1000 Battery unit 2000 Multilayer secondary battery 3000 Case 4000 Connection terminal 5000 Connection plate 6000 Connection plate

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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)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

L'invention concerne une batterie secondaire empilée dans laquelle : chaque électrode positive a une languette d'électrode positive; chaque électrode négative a une languette d'électrode négative; une connexion parallèle est établie dans une unité de batterie par liaison de languettes d'électrode positive l'une à l'autre et par liaison de languettes d'électrode négative l'une à l'autre dans l'unité de batterie, et par empilement de corps d'électrode, chacun d'entre eux étant composé d'une électrode positive, d'une couche d'électrolyte et d'une électrode négative; une pluralité d'unités de batterie sont empilées; la pluralité d'unités de batterie sont connectées en série; la languette d'électrode positive de l'une des unités de batterie adjacente l'une à l'autre dans la direction d'empilement et la languette d'électrode négative de l'autre ont des parties liées à une barre omnibus; et la partie où la languette d'électrode positive et la barre omnibus sont liées l'une à l'autre et la partie où la languette d'électrode négative et la barre omnibus sont liées l'une à l'autre sont adjacentes l'une à l'autre dans la direction d'empilement.
PCT/JP2017/034857 2016-10-26 2017-09-27 Batterie secondaire empilée et son procédé de production WO2018079165A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-209162 2016-10-26
JP2016209162A JP2020024778A (ja) 2016-10-26 2016-10-26 積層型二次電池及びその製造方法

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WO2018079165A1 true WO2018079165A1 (fr) 2018-05-03

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112582663A (zh) * 2019-09-12 2021-03-30 太阳诱电株式会社 全固体电池和电池组件
CN115101897A (zh) * 2021-03-05 2022-09-23 本田技研工业株式会社 电池模块
WO2022199152A1 (fr) * 2021-03-23 2022-09-29 宁德时代新能源科技股份有限公司 Ensemble électrode, cellule de batterie, batterie et dispositif de consommation d'énergie

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009519565A (ja) * 2005-12-14 2009-05-14 アヴェスター リミティッド パートナーシップ 電気化学バッテリー及びその製造方法
JP2011060623A (ja) * 2009-09-11 2011-03-24 Sanyo Electric Co Ltd 組電池
WO2013051138A1 (fr) * 2011-10-06 2013-04-11 トヨタ自動車株式会社 Batterie assemblée et procédé de production pour batterie assemblée
JP2013140707A (ja) * 2012-01-04 2013-07-18 Hitachi Ltd 電池モジュール及びその製造方法
JP2016115601A (ja) * 2014-12-17 2016-06-23 日立オートモティブシステムズ株式会社 蓄電モジュール

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009519565A (ja) * 2005-12-14 2009-05-14 アヴェスター リミティッド パートナーシップ 電気化学バッテリー及びその製造方法
JP2011060623A (ja) * 2009-09-11 2011-03-24 Sanyo Electric Co Ltd 組電池
WO2013051138A1 (fr) * 2011-10-06 2013-04-11 トヨタ自動車株式会社 Batterie assemblée et procédé de production pour batterie assemblée
JP2013140707A (ja) * 2012-01-04 2013-07-18 Hitachi Ltd 電池モジュール及びその製造方法
JP2016115601A (ja) * 2014-12-17 2016-06-23 日立オートモティブシステムズ株式会社 蓄電モジュール

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112582663A (zh) * 2019-09-12 2021-03-30 太阳诱电株式会社 全固体电池和电池组件
CN115101897A (zh) * 2021-03-05 2022-09-23 本田技研工业株式会社 电池模块
CN115101897B (zh) * 2021-03-05 2024-05-24 本田技研工业株式会社 电池模块
WO2022199152A1 (fr) * 2021-03-23 2022-09-29 宁德时代新能源科技股份有限公司 Ensemble électrode, cellule de batterie, batterie et dispositif de consommation d'énergie

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