WO2006135183A1 - Batterie secondaire au lithium ayant un fil d'anode et un fil de cathode faisant saillie d'une poche dans des directions opposees - Google Patents

Batterie secondaire au lithium ayant un fil d'anode et un fil de cathode faisant saillie d'une poche dans des directions opposees Download PDF

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Publication number
WO2006135183A1
WO2006135183A1 PCT/KR2006/002246 KR2006002246W WO2006135183A1 WO 2006135183 A1 WO2006135183 A1 WO 2006135183A1 KR 2006002246 W KR2006002246 W KR 2006002246W WO 2006135183 A1 WO2006135183 A1 WO 2006135183A1
Authority
WO
WIPO (PCT)
Prior art keywords
cathode
anode
lead
secondary battery
lithium secondary
Prior art date
Application number
PCT/KR2006/002246
Other languages
English (en)
Inventor
Whanjin Roh
Seongwoo Park
Byung Su Jung
Original Assignee
Enerland Co., Ltd.
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 Enerland Co., Ltd. filed Critical Enerland Co., Ltd.
Publication of WO2006135183A1 publication Critical patent/WO2006135183A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or 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
    • H01M50/10—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
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag 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
    • H01M50/547—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
    • H01M50/557—Plate-shaped terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a lithium secondary battery, more specifically, to a lithium secondary battery having an anode lead and a cathode lead oppositely projected from a pouch.
  • the present invention relates to a method for fabricating the lithium secondary battery.
  • a battery is a device to convert chemical energy of chemicals into electrical energy through electrochemical reaction, and is classified into two categories: a primary battery and a secondary battery.
  • a lithium secondary battery is the most important one, because it has the highest voltage and the largest energy density among existing batteries.
  • the lithium secondary battery is used in a field of electronic appliances such as mobile phones and notebooks.
  • the lithium secondary battery according to the method is fabricated by successively depositing a grid-type anode current collector 111, a matrix- film type anode 112, a matrix-film type separator 113, a matrix-film type cathode 114 and a grid-type cathode current collector 115, followed by laminating the members to integrate them, and folding the laminated members in a zig-zag fashion.
  • the lithium secondary battery prepared from the method comprises the electrode in a form of a continuous, integrated sheet, such that it can be called as a continuous type lithium secondary battery.
  • the continuous type lithium secondary battery has an advantage that it does not require tap treatment due to the use of continuous sheet- like electrode. But it suffers from the damage to the electrodes in the folding process because an electrode active material is detached at the folded position.
  • KR 309,604, 336,396 and 2002-93781 disclose examples in which a plurality of anode plates and a plurality of cathode plates are used.
  • each of the anode plates and each of the cathode plates are alternatively stacked such that the lithium secondary battery obtained from the method can be called as a stacked lithium secondary battery.
  • the stacked lithium secondary battery does not involve the damage to the electrode plate in the folding process.
  • Fig. 6 is a perspective view showing the conventional stacked lithium secondary battery. With regard to the arrangement of the electrodes on a separator to prepare the stacked lithium secondary battery shown in Fig.
  • the conventional lithium secondary battery 1' comprises an anode lead 30a' and a cathode lead 30b' that are projected from a pouch 20 in the same direction.
  • unexplained reference numeral 22' is a cavity for housing an electrode assembly. Investigation on heat distribution on the electrode plate at the charge and discharge of the lithium secondary battery revealed that the heat distribution on the electrode plate is dependent upon the distance from the lead. Specifically, it was observed that as the distance from the lead is farther, the heat is lower. To the contrary, as the distance from the lead is shorter, the heat is higher.
  • the anode lead 30a' and the cathode lead 30b' projected at the same side reinforces the uneven heat distribution.
  • uneven heat distribution is even reinforced and the position at the near to the lead (or electrode tap) undergoes much heat.
  • the electronic appliance is currently even smaller. This restricts installation of the anode lead 30a' and the cathode lead 30b' at the same side.
  • each of the anode lead 30a' or the cathode lead 30b' has a width of 5 10 mm. Therefore, the anode lead 30a' and the cathode lead 30b' positioned in the same side requires at least 10 mm width. Therefore, in this case, a lithium secondary battery with less than 10 mm width is not practical. Disclosure of Invention Technical Problem
  • An object of the present invention is to provide a lithium secondary battery that does not involve uneven heat distribution during charge and discharge.
  • Another object of the present invention is to provide a lithium secondary battery that does not substantially involve limitation on the width of the battery by a width of the lead.
  • a lithium secondary battery comprising: a rechargeable electrode assembly, a pouch equipped with a cavity into which the rechargeable electrode assembly is accommodated, an anode lead and a cathode lead that deliver current generated from the rechargeable electrode assembly to an outer circuit, wherein the anode lead and the cathode lead are oppositely projected from the pouch based on the electrode assembly.
  • the rechargeable electrode assembly is comprised of a plurality of anode plates and a plurality of cathode plates in which each of the anode plates has one anode tap and each of the cathode plates has one cathode tap, and each of the anode plates and each of the cathode plates are alternatively arranged to each other and separated by a separator.
  • the separator is successively folded in a fixed one direction.
  • the lithium secondary battery having an anode lead and a cathode lead oppositely projected from a pouch provides the following advantages.
  • the lithium secondary battery of the present invention solves uneven or unbalanced heat distribution during charge/discharge of the battery. Inside the lithium secondary battery, uniform or balanced heat distribution is accomplished. This increases the safety of the battery. Specifically, this reduces the danger of explosion of the battery that may be caused by excessive heat unbalance.
  • the width of the lithium secondary battery of the present invention is not restricted by the presence of the lead. This facilitates fabrication of even smaller sized batteries. Further, when the width of the lithium secondary battery was set to a certain value, the lithium secondary battery of the present invention can accommodate even larger lead than the conventional ones. This ensures much enhanced flow of the current. The lithium secondary battery with higher capacity and higher output can be obtainable.
  • the lead can be positioned at the center of the electrode plate. This simplifies arrangement of the electrode plate on the separator.
  • the conventional lithium secondary battery has the anode lead and the cathode lead on the same side. In the case, each of the anode plate (or the cathode plate) should have two different configurations on the separator. To the contrary, the lithium secondary battery of the present invention makes it possible to be arranged as only one configuration.
  • FIG. 1 is a perspective view showing a preferred embodiment of the lithium secondary battery, in accordance with the present invention.
  • FIG. 2 is a cross-sectional view showing a preferred embodiment of the lithium secondary battery, in accordance with the present invention.
  • FIG. 3 is a resolved cross-sectional view showing a preferred embodiment of the lithium secondary battery, in accordance with the present invention.
  • FIG. 4 is a perspective view showing a preferred embodiment of the electrode assembly used for the lithium secondary battery of the present invention.
  • FIG. 5 is a cross-sectional view showing a conventional continuous type lithium secondary battery.
  • FIG. 6 is a perspective view showing a typical conventional lithium secondary battery. Mode for the Invention
  • Fig. 1 is a perspective view showing a preferred embodiment of the lithium secondary battery, in accordance with the present invention.
  • Fig. 2 is a cross-sectional view showing a preferred embodiment of the lithium secondary battery, in accordance with the present invention.
  • Fig. 3 is a resolved cross-sectional view showing a preferred embodiment of the lithium secondary battery, in accordance with the present invention.
  • the lithium secondary battery of the present invention 1 comprises a pouch 20 having a cavity 22, an electrode assembly 10 accommodated into the cavity 22, an anode lead 30a and a cathode lead 30b oppositely projected from the pouch 20 base on the electrode assembly 10.
  • the electrode assembly 10 is comprised of a plurality of anode plates
  • each of the anode plates 12a has only one anode tap 16a
  • each of the cathode plates 12b has only one cathode tap 16b.
  • the anode taps 16a of the anode plates 12a are overlapping one another and the cathode taps 16b of the cathode plates 12b are also overlapping one another, as specifically exemplified in Fig. 4.
  • the anode taps 16a and cathode taps 16b overlapping one another are each independently subjected to tap treatment, and then integrated each independently. Details of the tap treatment are described in Korean published patent No. 2003-95519 and Korean patent application No. 2004-82841.
  • an anode lead 30a and a cathode lead 30b are each independently connected to deliver current from the electrode assembly 10 to an outer circuit or to charge the electrode assembly 10 with aid of an outer power source.
  • the most important distinguishing point of the present invention is that the anode lead 30a and cathode lead 30b are positioned in parallel with the anode taps 16a and the cathode taps 16b and projected oppositely from the pouch 20 based on the electrode assembly 10. This arrangement avoids the uneven heat distribution during charge and discharge of the battery. As mentioned in the description of the prior art, the heat distribution is proportional to the distance from the lead. With the anode lead 30a and cathode lead 30b oppositely projected from the pouch 20, the uneven heat distribution on the anode plate 12a and the cathode plate 12b is offset, thereby relieving the uneven heat distribution on the electrode assembly 10.
  • each of the anode lead 30a and cathode lead 30b has a width of 5 mm.
  • the lithium secondary battery 1' should have at least above 10 mm width. Generally, it requires 13 mm width. According to the present invention, however, the battery having 6 mm width satisfies such a condition. Therefore, the width of the battery is not substantially limited by the anode lead 30a and the cathode lead 30b.
  • the electrode plate (12a, 12b) may be cut into a rectangular or circular shape, provided that the electrode plate (12a, 12b) has only one tap (16a, 16b).
  • the shape of the electrode plate (12a, 12b) can be changed according to the desired form of the final electrochemical cell.
  • the rectangular battery is typically used in PDA or mobile phone.
  • the electrode plate (12a, 12b) is manufactured by coating an electrode active material (a cathode active material or an anode active material) onto a current collector. Regarding energy density, double-sided coating is preferable.
  • Preferred cathode and anode active materials are exemplified in US Patent Nos. 5,837,015, 5,635,151 and 5,501,548.
  • a lithium transition metal oxide capable of intercalation/deintercalation of lithium ion such as LiCoO 2 , LiMn 2 O 4 ,
  • LiNiO 2 or LiMnO 2 can be mentioned as a cathode active material.
  • an anode active material a material capable of intercalation/deintercalation of lithium ion, such as lithium metal, lithium alloy, carbon and graphite, can be mentioned.
  • the anode active material is carbon or graphite.
  • the cathode or anode active material is dispersed into a suitable solvent, coated onto the surface of the current collector, and cut into a desired size to form the anode plate 12a or the cathode plate 12b, respectively.
  • the electrode active material may be coated on one surface of the current collector. Preferably, it is coated on both surfaces of the current collector. Double-sided coating provides an increased discharge capacity per unit volume.
  • preferred examples of the current collector please refer toUS Patent Nos. 5,837,015, 5,635,151 and 5,501,548, which are incorporated herein by reference. According to the specific embodiment of the present invention, an aluminum thin plate and a copper thin plate were used as a cathode and anode current collector, respectively.
  • the electrode active material is, in general, coated on the surface of the current collector, in combination with a current conductive material that increases conductivity of the electrochemical cell and a binder that adheres both the electrode active material and the current conductive material to the current collector.
  • a current conductive material that increases conductivity of the electrochemical cell
  • a binder that adheres both the electrode active material and the current conductive material to the current collector.
  • the separator 14 has a role to prevent a direct electrical contact of the anode plate
  • porous polyolefin films such as a polyethylene film or a polypropylene film, porous polyvinylidene fluoride films, porous hexapropylene fluoride films and porous polyethylene oxide films.
  • the polyethylene film is being widely used in the art.
  • the separator 14 is successively folded in a fixed one direction. This increases the characteristics of the battery through tight fastening of the separator 14.
  • the separator 14 may be folded in a zig-zag fashion, as described in KR 309,604 and 336,396, and JP H09-320637. However, the separator 14 is preferably folded in a fixed one direction, as shown in Fig. 4.
  • the electrode assembly 10 with the anode lead 30a and the cathode lead 30b oppositely projected and extended in parallel from the taps (12a, 12b) is inserted into the cavity 22 of the pouch 20.
  • An electrolyte solution is injected into the cavity 22 and the pouch 20 is sealed.
  • heat-fused sheet may be additionally used, as shown in KR 274,867.
  • unexplained reference numeral 50 is sealant.
  • the method reduces the scale of an facility required for adhering electrode plates and enables to efficiently utilize a working space, because the anode plates as well as the cathode plates are neighboring one another such that the portion to which the electrode plates are adhered can be reduced as much as 1/2, compared with KR 309,604, KR 336,396 and KR published patent 2002-93781.
  • the lithium secondary battery fabricated by the method according to the present invention has highly enhanced charge/discharge characteristics because of stable interface by tight fastening of the separator sandwiched between the anode plate and the cathode plate during successive folding. And, the battery has no danger of an electrical short due to a complete separation between an anode plate and a cathode plate by a separator.

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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)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne une batterie secondaire au lithium ayant un fil d'anode et un fil de cathode faisant saillie d'une poche dans des directions opposées. La batterie secondaire au lithium comprend a) un ensemble d'électrodes rechargeables contenant une pluralité de plaques d'anode et une pluralité de plaques de cathode dans lesquelles chacune des plaques d'anode possède une prise d'anode et chacune des plaques de cathode possède une prise de cathode, et chacune des plaques d'anode et chacune des plaques de cathode sont disposées de manière alternée l'une par rapport à l'autre et séparées par un séparateur; b) une poche équipée d'une cavité dans laquelle l'ensemble d'électrodes rechargeables est logé; et c) un fil d'anode et un fil de cathode qui acheminent le courant généré depuis l'ensemble d'électrodes rechargeables vers un circuit externe, le fil d'anode et le fil de cathode faisant saillie de la poche dans des directions opposées par rapport à l'ensemble d'électrodes et étant parallèles à la prise d'anode et à la prise de cathode. La batterie secondaire au lithium offre divers avantages comme la simplicité de traitement des prises et la distribution thermique équilibrée. En outre, la largeur de la batterie n'est pas sensiblement limitée par la présence du fil.
PCT/KR2006/002246 2005-06-13 2006-06-13 Batterie secondaire au lithium ayant un fil d'anode et un fil de cathode faisant saillie d'une poche dans des directions opposees WO2006135183A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20-2005-0016825U KR200394701Y1 (ko) 2005-06-13 2005-06-13 음극리드와 양극리드가 파우치의 반대면에 돌출된리튬이차전지
KR20-2005-0016825 2005-06-13

Publications (1)

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WO2006135183A1 true WO2006135183A1 (fr) 2006-12-21

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WO (1) WO2006135183A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10468638B2 (en) 2013-11-27 2019-11-05 Lg Chem, Ltd. Method for forming a pouch for a secondary battery

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100858416B1 (ko) * 2006-04-03 2008-09-11 주식회사 엘지화학 안전성이 향상된 리튬 이차전지
KR101106428B1 (ko) 2009-12-01 2012-01-18 삼성에스디아이 주식회사 이차 전지

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5162172A (en) * 1990-12-14 1992-11-10 Arch Development Corporation Bipolar battery
US6136466A (en) * 1995-05-25 2000-10-24 Wilson Greatbatch Ltd. Prismatic high rate cell
US20030148174A1 (en) * 2002-02-06 2003-08-07 Samsung Sdi Co., Ltd. Battery unit, lithium polymer battery using the same, and method for manufacturing lithium polymer battery
US6713987B2 (en) * 2002-02-28 2004-03-30 Front Edge Technology, Inc. Rechargeable battery having permeable anode current collector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5162172A (en) * 1990-12-14 1992-11-10 Arch Development Corporation Bipolar battery
US6136466A (en) * 1995-05-25 2000-10-24 Wilson Greatbatch Ltd. Prismatic high rate cell
US20030148174A1 (en) * 2002-02-06 2003-08-07 Samsung Sdi Co., Ltd. Battery unit, lithium polymer battery using the same, and method for manufacturing lithium polymer battery
US6713987B2 (en) * 2002-02-28 2004-03-30 Front Edge Technology, Inc. Rechargeable battery having permeable anode current collector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10468638B2 (en) 2013-11-27 2019-11-05 Lg Chem, Ltd. Method for forming a pouch for a secondary battery

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Publication number Publication date
KR200394701Y1 (ko) 2005-09-05

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