WO2013168260A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2013168260A1
WO2013168260A1 PCT/JP2012/062012 JP2012062012W WO2013168260A1 WO 2013168260 A1 WO2013168260 A1 WO 2013168260A1 JP 2012062012 W JP2012062012 W JP 2012062012W WO 2013168260 A1 WO2013168260 A1 WO 2013168260A1
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WO
WIPO (PCT)
Prior art keywords
positive electrode
collector plate
current collector
negative electrode
battery
Prior art date
Application number
PCT/JP2012/062012
Other languages
English (en)
Japanese (ja)
Inventor
青田　欣也
佐々木　孝
Original Assignee
日立ビークルエナジー株式会社
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 日立ビークルエナジー株式会社 filed Critical 日立ビークルエナジー株式会社
Priority to JP2014514306A priority Critical patent/JPWO2013168260A1/ja
Priority to PCT/JP2012/062012 priority patent/WO2013168260A1/fr
Publication of WO2013168260A1 publication Critical patent/WO2013168260A1/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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/75—Wires, rods or strips
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • 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
    • H01M50/562—Terminals 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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • 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 secondary battery.
  • a wound electrode group in which a positive electrode foil coated with a positive electrode active material and a negative electrode foil coated with a negative electrode active material are wound in a flat shape via a separator;
  • a container in which the wound electrode group is accommodated, a lid for sealing the container, a positive electrode terminal and a negative electrode terminal provided on the lid, and a positive electrode foil and a positive electrode terminal of the wound electrode group are electrically connected.
  • the positive electrode current collector plate supported by the lid and the negative electrode current collector plate electrically connected to the negative electrode foil and the negative electrode terminal of the wound electrode group and supported by the lid are provided.
  • the positive electrode current collector plate is disposed between the can and the flat outer peripheral surface of the positive electrode foil of the positive electrode active material uncoated portion of the wound electrode group and the can, and the negative electrode current collector plate is the negative electrode active material uncoated portion of the wound electrode group It is known to arrange between the flat outer peripheral surface of the negative electrode foil and the can (see Patent Document 1).
  • the secondary battery according to the first aspect of the present invention is a wound electrode in which a positive electrode foil coated with a positive electrode active material and a negative electrode foil coated with a negative electrode active material are wound in a flat shape through a separator.
  • a positive electrode current collector plate electrically connected to the terminal and supported by the battery lid; and a negative electrode current collector electrically connected to the negative electrode foil of the wound electrode group and the negative electrode external terminal and supported by the battery lid And an electric board.
  • the positive electrode current collector plate is bifurcated from the fixed portion supported by the battery lid toward the bottom surface of the battery case, and the positive electrode first current collector plate and the positive electrode second current collector plate extend along the inner surface of the battery case respectively. And at least a positive electrode first current collector plate is formed with a thin portion, and a positive electrode current collector plate is sandwiched between a thin portion of the positive electrode first current collector plate and a positive electrode second current collector plate.
  • the positive electrode foil is electrically connected.
  • the electrical resistance of the secondary battery due to the charge and discharge current can be reduced without reducing the capacity of the battery.
  • FIG. 1 is an external view of a secondary battery (battery) according to a first embodiment.
  • FIG. 2 is a view showing an internal structure of a secondary battery.
  • FIG. 3 is an exploded view showing the configuration of the positive electrode terminal.
  • FIG. 4 is a view of the positive electrode current collector plate as seen from the negative electrode side.
  • FIG. 5 is a perspective view of the positive electrode terminal fixed to the battery cover. 6 is an AB cross-sectional view of FIG. 5;
  • FIG. 7 is a perspective view of a lid assembly in which a positive electrode terminal and a negative electrode terminal are attached to a battery lid.
  • FIG. 8 is a configuration diagram of a wound electrode group.
  • FIG. 9 is a perspective view for explaining connection between a wound electrode group and a current collector plate.
  • FIG. 10 is a view showing a cross section during ultrasonic bonding of the positive electrode side uncoated portion of the wound electrode group and the current collector;
  • FIG. 11 is a view showing a cross section of a bonded portion between a positive electrode side uncoated portion of a wound electrode group and a current collector;
  • FIG. 12 is a perspective view of a positive electrode current collector of the second embodiment.
  • FIG. 13 is a view of the positive electrode current collector plate from the negative electrode side.
  • FIG. 14 is a perspective view of a lid assembly according to a third embodiment.
  • FIG. 15 is a perspective view of a lid assembly according to a fourth embodiment.
  • FIG. 1 is a view showing the appearance of a secondary battery according to the first embodiment.
  • the prismatic secondary battery 100 includes a battery case configured of a battery can 52 and a battery lid 6.
  • the material of the battery can 52 and the battery cover 6 is aluminum or an aluminum alloy.
  • FIG. 2 is a view showing an internal structure of the battery 100.
  • the wound electrode group 30 is accommodated in the battery can 52.
  • the battery can 52 has a pair of wide surfaces 52a, a pair of narrow surfaces 52b, and a bottom surface 52c, and is formed in a rectangular box shape whose upper surface is opened.
  • the wound electrode group 30 is accommodated in the battery can 52 in a state of being covered by an insulating case (not shown). That is, the battery can 52 is a container for accommodating the wound electrode group 30.
  • the material of the insulating case is an insulating resin such as polypropylene. Thereby, the inner surface of the battery can 52 and the wound electrode group 30 are electrically insulated.
  • the battery cover 6 has a rectangular flat plate shape, and is welded so as to close the opening of the battery can 52 to seal the battery can 52.
  • a positive electrode external terminal 1P and a negative electrode external terminal electrically connected to the positive electrode 36 and the negative electrode 37 of the wound electrode group 30 via the positive electrode current collector plate 8 and the negative electrode current collector plate 20, respectively. 1N is provided.
  • the battery cover 6 is provided with a liquid injection hole 25 for injecting an electrolytic solution, and a gas discharge valve 26 which is cleaved when the pressure in the battery container rises and reaches a predetermined pressure. . After the electrolytic solution is injected into the battery can 52, the injection hole 25 is sealed by the injection plug 53 (FIG. 1).
  • FIG. 3 is an exploded perspective view showing the configuration of the positive electrode external terminal 1P and the positive electrode current collector plate 8.
  • the positive electrode external terminal 1P and the positive electrode current collector plate 8 are fixed to the battery cover 6 by the gasket 5 and the insulating spacer 7 as described later.
  • the positive electrode external terminal 1P is composed of a bolt portion 2, a flange portion 3 and a shaft portion 4.
  • the negative electrode external terminal 1N and the negative electrode current collector plate 20 are similarly fixed to the battery cover 6, but the structure of the negative electrode current collector plate 20 is different from that of the positive electrode current collector plate 8.
  • FIG. 4 is a view of the positive electrode current collector plate 8 as viewed from the negative electrode 37 side.
  • the positive electrode current collector plate 8 has a fixed portion 9 extending along the bottom surface of the battery lid 6 and a positive electrode first current collector bifurcated downward from the battery can from both ends of the fixed portion 9 in the battery can thickness direction.
  • a plate 10 and a positive electrode second current collector plate 11 are provided.
  • An upper parallel portion UP which is bent toward the battery can bottom surface from both ends of the fixed portion 9 and extends in parallel with the inner surface of the battery can, each of the positive electrode first current collector plate 10 and the positive electrode second current collector plate 11;
  • An inclined portion IC bent obliquely toward the inside of the battery can from the lower end of the upper parallel portion UP, and a lower parallel portion bent from the lower end of the inclined portion IC toward the bottom of the battery can and extending parallel to the inner surface of the battery can And LP.
  • the lower parallel portion LP of the positive electrode first current collector plate 10 is a portion to be welded to the positive electrode 36, and the lower parallel portion LP is formed thinner than the upper parallel portion UP.
  • the lower parallel portion LP of the positive electrode first current collector plate 10 is referred to as a positive electrode first current collector plate thin portion 12.
  • FIG. 5 is an assembled perspective view of the positive electrode external terminal 1P fixed to the battery cover 6 and the positive electrode current collector plate 8, and FIG. 6 is a sectional view taken along the line AB of FIG. Is shown.
  • the shaft portion 4 of the positive electrode external terminal 1P is inserted through the through holes of the gasket 5, the battery cover 6, the insulating spacer 7, and the fixing portion 9.
  • a caulking portion 13 is formed by caulking the tip of the shaft portion 4 inserted into the through holes of the respective portions.
  • the positive electrode external terminal 1 P, the gasket 5, the insulating spacer 7 and the positive electrode current collector plate 8 are fixed to the battery cover 6 by the caulking portion 13.
  • the material of the positive electrode current collector plate 8 and the positive electrode external terminal 1P is aluminum or an aluminum alloy, and the material of the gasket 5 and the insulating spacer 7 is resin. Therefore, the positive electrode external terminal 1P, the positive electrode current collector plate 8 and the battery cover 6 are insulated.
  • FIG. 7 is a perspective view of a lid assembly in which the positive electrode external terminal 1P and the positive electrode current collector plate 8 and the negative electrode external terminal 1N and the negative electrode current collector plate 20 are attached to the battery cover 6.
  • the negative electrode external terminal 1N and the negative electrode current collector plate 20 are fixed to the battery cover 6 through the gasket 5 and the insulating spacer 7 by caulking a shaft portion (not shown) of the negative electrode external terminal 1N. It is fixed in an insulated state.
  • the material of the negative electrode current collector plate 20 and the negative electrode external terminal 1N is copper or a copper alloy.
  • FIG. 8 is a view showing the configuration of the wound electrode group 30.
  • the wound electrode group 30, which is a storage element has a laminated structure by winding the long positive electrode foil 34 and the negative electrode foil 31 in a flat shape with the separator 33 interposed.
  • a positive electrode active material mixture layer 35 coated with a positive electrode active material mixture in which a binder (binder) is mixed with a positive electrode active material is provided on both surfaces of the positive electrode foil 34.
  • a negative electrode active material mixture layer 32 coated with a negative electrode active material mixture in which a binder (binder) is mixed with a negative electrode active material is provided on both surfaces of the negative electrode foil 31. Charging and discharging are performed between the positive electrode active material and the negative electrode active material.
  • the positive electrode foil 34 is, for example, an aluminum foil with a thickness of 30 ⁇ m
  • the negative electrode foil 31 is, for example, a copper foil with a thickness of 20 ⁇ m.
  • the material of the separator 33 is, for example, a porous polyethylene resin.
  • a positive electrode foil 34 coated with a positive electrode active material mixture layer 35 is referred to as a positive electrode 36 and a negative electrode foil 35 coated with a negative electrode active material mixture layer 32 is referred to as a negative electrode 37.
  • each end of the wound electrode group 30 in the width direction has the positive electrode active material mixture layer 35 not formed on the positive electrode side uncoated portion 34 a (exposed portion of the positive electrode foil 34 Of the negative electrode side uncoated part 31a (exposed part of the negative electrode foil 35) where the negative electrode active material mixture layer 32 is not formed is laminated.
  • the laminate of the positive electrode side uncoated portion 34a and the laminate of the negative electrode side uncoated portion 31a are respectively crushed in advance, and the positive electrode current collector plate 8 and the negative electrode current collector plate 20 are connected by ultrasonic bonding.
  • connection between the positive electrode 36 of the wound electrode group 30 and the positive electrode current collector plate 8 and the connection between the negative electrode 37 of the wound electrode group 30 and the negative electrode current collector plate 20 are performed as follows.
  • the positive electrode first current collector plate 10 is deformed so as to be separated from the positive electrode second current collector plate 11, and between the positive electrode first current collector plate 10 and the positive electrode second current collector plate 11.
  • the positive electrode side uncoated portion 34 a of the wound electrode group 30 is inserted.
  • transformation of the positive electrode 1st current collection board 10 at this time it is desirable that it is a deformation
  • the negative electrode current collector plate 20 of the wound electrode group 30 and the negative electrode side uncoated portion 31a are opposed to each other.
  • FIG. 2 is a figure which shows the state after connecting the positive electrode 1st and 2nd current collection plates 10 and 11 and the positive electrode side uncoated part 34a of the winding electrode group 30.
  • FIG. 10 is a view showing a cross section during ultrasonic bonding of the positive electrode side uncoated portion 34 a of the wound electrode group 30 and the current collectors 10 (thin portions 12), 11.
  • FIG. 11 is a figure which shows the cross section of the junction part of the positive electrode side uncoated part 34a of the winding electrode group 30, and the current collection board 10 (thin part 12), 11.
  • Ultrasonic bonding is performed by sandwiching the thin portion 12 of the positive electrode first current collector plate 10, the positive electrode foil 34, and the positive electrode second current collector plate 11 between the stator 50 and the vibrator 51 and vibrating the vibrator 51. , Ultrasonic bonding portion 40.
  • the positive electrode second current collector plate 11 with which the stator 50 abuts be thicker. This is because the positive electrode second current collector plate 11 is fixed by the stator 50 so as not to move by the vibration of the vibrator 51 at the time of ultrasonic bonding. That is, it is preferable to make the positive electrode second current collector plate 11 thicker than the positive electrode first current collector plate thin portion 12.
  • the thickness of positive electrode first current collector plate 10 is 1.0 mm, for example, the thickness of positive electrode first current collector plate thin portion 12 is 0.2 mm, for example, positive electrode second current collector
  • the thickness of the plate 11 is 1.0 mm. Therefore, the positive electrode first current collector plate 10 is thinned from 1.0 mm to 0.2 mm in the positive electrode first current collector plate thin portion 12. For example, the positive electrode first current collector plate 10 is pressed to obtain the positive electrode first current collector plate thin portion 12.
  • Negative electrode current collector plate 20 is formed to have the same plate thickness of, for example, 1.0 mm as the thickness of positive electrode first current collector plate 10.
  • battery 100 configured as above, when current flows through charge / discharge current through positive electrode external terminal 1 P, positive electrode current collector plate 8, negative electrode external terminal 1 N, and negative electrode current collector plate 20.
  • the electrical resistance can be reduced by increasing the cross sectional area of the current collectors 8 and 20.
  • the width of the current collectors 8 and 20 is increased in order to increase the cross-sectional area of the current collectors 8 and 20, it is necessary to widen the width of the positive electrode uncoated portion 34a and the negative electrode uncoated portion 31a.
  • the width of the battery 100 is defined by the battery can 52, the coating width of the active material mixture layers 35 and 32 must be reduced, and the battery capacity is reduced.
  • the current collectors 8 and 20 in order to increase the cross-sectional area of the current collectors 8 and 20, it is conceivable to make the current collectors 8 and 20 thicker. However, if the current collector plates 8 and 20 are too thick, the coating thickness of the active material mixture layers 35 and 32 is reduced to secure the distance between the wound electrode group 30 and the inner surface of the battery can 52 and winding is performed. The electrode group 30 has to be made thin, and the battery capacity is reduced. Therefore, the cross-sectional areas and cross-sectional shapes of the current collectors 8 and 20 have appropriate ranges. Further, as described above, in ultrasonic bonding, the friction is larger on the vibrator 51 side than on the stator 50 side, and the amount of heat generation is also large.
  • the bonding portion In order to increase the temperature of the bonding portion, it is desirable to thin only the vicinity of the ultrasonic bonding portion 40 in the positive electrode first current collector plate 10 in contact with the vibrator 51. This can increase the bonding strength. On the other hand, since the positive electrode second current collector plate 11 is the side in contact with the stator 50 in ultrasonic bonding, the bonding temperature is not affected even if it is thick.
  • the positive electrode current collector plate 8 When the material of the positive electrode current collector plate 8 is aluminum or an aluminum alloy and the material of the negative electrode current collector plate 20 is copper or a copper alloy as in the present embodiment, the positive electrode current collector plate 8 having higher electric resistance. It is particularly effective to form the positive electrode first current collector thin-walled portion 12.
  • winding is performed while reducing the electric resistance of the secondary battery 100 due to charge and discharge current without reducing the battery capacity and without increasing the size of the battery.
  • the secondary battery which can connect the electrode group 30 and the positive electrode current collecting plate 8 favorably can be provided.
  • FIG. 12 is a perspective view of the positive electrode current collector plate 60 of the second embodiment
  • FIG. 13 is a view of the positive electrode current collector plate 60 as viewed from the negative electrode 37 side.
  • the positive electrode current collector plate 60 of the second embodiment includes a fixing portion 61, a positive electrode first current collector plate 64 branched from both ends of the fixed portion 61, and a positive electrode second current collector plate 62.
  • the positive electrode first current collector plate thin portion 65 is formed in the portion in contact with the positive electrode 36 of the positive electrode first current collector plate 64, and in the portion in contact with the positive electrode 36 of the positive electrode second current collector plate 62.
  • the positive electrode second current collector plate thin portion 63 is formed.
  • the positive electrode first current collector plate 64 is deformed and opened relative to the positive electrode second current collector plate 62, and the positive electrode first current collector plate 64 is opened.
  • the positive electrode side uncoated portion 34 a is sandwiched between the first and second positive electrode current collector plates 62, and the positive electrode current collector plates 62 and 64 are ultrasonically welded to the positive electrode 36.
  • the secondary battery can be enlarged without reducing the battery capacity. It is possible to provide a secondary battery capable of favorably connecting the wound electrode group 30 and the positive electrode current collector plate 60 while further reducing the electrical resistance of the secondary battery 100 due to charge and discharge current without causing the
  • a third embodiment of a secondary battery according to the present invention will be described with reference to FIG.
  • the same components as in the first embodiment will be assigned the same reference numerals and differences will be mainly described.
  • the points that are not particularly described are the same as in the first embodiment.
  • the thin portion similar to the positive electrode first current collector plate thin portion 12 is formed not only on the positive electrode current collector plate 8 but also on the negative electrode current collector plate 20. It is different from the form.
  • FIG. 14 is a perspective view of a lid assembly in which the positive electrode external terminal 1P and the negative electrode external terminal 1N are attached to the battery lid 6 of the third embodiment.
  • the negative electrode current collector plate 20 of the third embodiment includes the fixing portion 27, the negative electrode first current collector plate 22 bifurcated from both ends of the fixed portion 27, and the negative electrode second current collector plate 23 There is.
  • a negative electrode first current collector plate thin portion 21 is formed in a portion in contact with the negative electrode 37 of the negative electrode first current collector plate 22.
  • the charge / discharge current flows through the first and second positive current collectors 10 and 11 and the first and second current collectors 22 and 23 which are bifurcated.
  • the wound electrode group 30 and the positive electrode current collector plate 8 are provided while further reducing the electrical resistance of the secondary battery 100 due to charge and discharge current without lowering the battery capacity and without causing the secondary battery to be enlarged.
  • the secondary battery which can be connected favorably with the negative electrode current collector plate 20 can be provided.
  • a fourth embodiment of the secondary battery according to the present invention will be described with reference to FIG.
  • the same components as those in the first to third embodiments will be assigned the same reference numerals and differences will be mainly described. Points that are not particularly described are the same as in the first to third embodiments.
  • the second current collector plate 92 differs from the first to third embodiments in that thin portions are formed respectively.
  • FIG. 15 is a perspective view of a lid assembly in which the positive electrode external terminal 1P and the negative electrode external terminal 1N are attached to the battery lid 6 of the fourth embodiment.
  • the positive electrode current collector plate 60 of the fourth embodiment is the same as the positive electrode current collector plate 60 of the second embodiment.
  • the negative electrode current collector plate 90 according to the fourth embodiment includes a fixed portion 91, a negative electrode first current collector plate 94 branched from both ends of the fixed portion 91, and a negative electrode second current collector plate 92. There is.
  • a negative first current collector thin portion 95 is formed in a portion in contact with the negative electrode 37 of the first negative current collector plate 94, and a portion in contact with the negative electrode 37 of the second negative current collector plate 92.
  • the negative electrode second current collector plate thin portion 93 is formed.
  • the wound electrode is further reduced without decreasing the battery capacity and without increasing the size of the secondary battery while further reducing the electric resistance of the secondary battery 100 due to the charge and discharge current. It is possible to provide a secondary battery in which the group 30, the positive electrode current collector plate 60 and the negative electrode current collector plate 90 can be connected more favorably.
  • the thin portion 12 of the positive first electrode current collector plate 10 is formed by thinning the entire lower parallel portion LP of the positive electrode first current collector plate 10.
  • a region to be ultrasonically welded for example, FIG. Only the area indicated by hatching may be thinned.
  • the partial region of the bottom surface side of the battery can be thinned instead of the entire lower parallel portion LP.
  • the modification of this thin-walled part is the same as in the case where the thin-walled part is formed on the positive electrode second current collector plate 11. The same applies to the case where a thin portion is formed on the negative electrode current collector plates 20, 60, 90.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

La batterie secondaire de l'invention est équipée : d'un réceptacle de batterie dans lequel est admis un groupe d'électrodes enroulées présentant une feuille d'électrode positive sur laquelle une matière active d'électrode positive est appliquée, et une feuille d'électrode négative sur laquelle une matière active d'électrode négative est appliquée, enroulées à plat avec un séparateur pour intermédiaire ; d'un couvercle de batterie scellant le réceptacle de batterie ; d'une borne de partie externe d'électrode positive ainsi que d'une borne de partie externe d'électrode négative agencée sur le couvercle de batterie ; d'une plaque de collecteur d'électrode positive qui tout en étant électriquement connectée à la borne de partie externe d'électrode positive et à la feuille d'électrode positive du groupe d'électrodes enroulées, est maintenue par le couvercle de batterie ; et d'une plaque de collecteur d'électrode négative qui tout en étant électriquement connectée à la borne de partie externe d'électrode négative et à la feuille d'électrode négative du groupe d'électrodes enroulées, est maintenue par le couvercle de batterie. La plaque de collecteur d'électrode positive possède une première plaque de collecteur d'électrode positive ainsi qu'une seconde plaque de collecteur d'électrode positive bifurquant depuis une partie fixe maintenue par le couvercle de batterie vers la face fond du réceptacle de batterie, et se prolongeant individuellement suivant une face interne du réceptacle de batterie. Une partie épaisse est formée au moins sur la première plaque de collecteur d'électrode positive, et la plaque de collecteur d'électrode positive est électriquement connectée à la feuille d'électrode positive laquelle est enserrée entre la partie épaisse de la première plaque de collecteur d'électrode positive et la seconde plaque de collecteur d'électrode positive.
PCT/JP2012/062012 2012-05-10 2012-05-10 Batterie secondaire WO2013168260A1 (fr)

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WO2017159760A1 (fr) * 2016-03-17 2017-09-21 株式会社Ｇｓユアサ Élément de stockage d'électricité et procédé de fabrication d'élément de stockage d'électricité
JP2021111587A (ja) * 2020-01-15 2021-08-02 トヨタ自動車株式会社 二次電池
JPWO2021171334A1 (fr) * 2020-02-25 2021-09-02

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CN106688123A (zh) * 2014-09-26 2017-05-17 日立汽车系统株式会社 矩形二次电池
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JP2021111587A (ja) * 2020-01-15 2021-08-02 トヨタ自動車株式会社 二次電池
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WO2021171334A1 (fr) * 2020-02-25 2021-09-02 株式会社 東芝 Fil de connexion et batterie

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