USRE43241E1 - Electrode assembly for secondary battery and method for fabricating the same - Google Patents

Electrode assembly for secondary battery and method for fabricating the same Download PDF

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Publication number
USRE43241E1
USRE43241E1 US12/885,019 US88501910A USRE43241E US RE43241 E1 USRE43241 E1 US RE43241E1 US 88501910 A US88501910 A US 88501910A US RE43241 E USRE43241 E US RE43241E
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United States
Prior art keywords
positive
separator
negative
electrode
turns
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Expired - Lifetime
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US12/885,019
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Chang-seob Kim
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Samsung SDI Co Ltd
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Samsung SDI Co Ltd
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Priority to US12/885,019 priority Critical patent/USRE43241E1/en
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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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M2010/4292—Aspects relating to capacity ratio of electrodes/electrolyte or anode/cathode
    • 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

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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)
  • Battery Electrode And Active Subsutance (AREA)
  • Cell Separators (AREA)

Abstract

A roll electrode assembly of a secondary battery includes a positive electrode rolled having a plurality of turns, a negative electrode rolled having a plurality of turns, and first and second separators each rolled to have a plurality of turns. Each turn of the first separator is disposed between each outer surface of the turns of the negative electrode and each inner surface of the turns of the positive electrode. Each turn of the second separator is disposed between each outer surface of the turns of the positive electrode and each inner surface of the turns of the negative electrode. The thickness of the second separator is thinner than that of the first separator.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a secondary battery and, more particularly, to an electrode assembly of a secondary battery, which is designed to enhance battery safety, and a method for making the same.
2. Description of Prior Art
A secondary battery comprises an electrode assembly disposed within a can containing an electrolyte. The electrode assembly comprises positive and negative electrodes on which positive and negative active materials are deposited respectively. Therefore, the charging and discharging of the second battery is realized by the physical and chemical reactions occurring between active materials and the electrolyte.
In such a secondary battery, a capacity ratio of the negative active material to the positive active material (N/P ratio) is usually maintained within a range of 1.2-1.4 to obtain a reserve for sufficient absorption of ions released from the positive electrode into the negative electrode.
If the N/P ratio is less than 1, a metal oxide material is precipitated within the secondary battery or the electrolyte may leak since ions discharged from the positive electrode cannot be completely absorbed into the negative electrode. This result results in the deterioration of the charging and discharging performance or in the explosion of the battery by increased internal pressure.
Secondary batteries are classified into several types depending on their shape: a cylindrical type, a package type and a prism type. For example, the prism type secondary battery, since the electrode assembly is rolled having an oval section, it is very difficult to provide the suitable N/P ratio throughout the entire surface of the electrode assembly.
This will be described more in detail with reference to FIGS. 1-5.
FIG. 1 shows a conventional prism type secondary battery.
The conventional prism type secondary battery comprises a can 4, a roll electrode assembly 2 disposed within the can 4, and a cap assembly 6 close-tightly closely and tightly mounted on an upper end of the can 4.
Rolling a group of plates makes the roll electrode assembly 2. That is, a separator plate, a negative electrode plate, another separator plate, and a positive electrode plate are, in this order, stacked to provide a group of stacked plates. The plate group is then rolled into the roll electrode assembly as shown in FIG. 2.
The cross section of the roll electrode assembly 2 is track-shaped so that it can be inserted into the prismatic rectangular can 4. As shown in FIG. 2, the roll electrode assembly 2 comprises positive and negative electrodes 2a and 2b, and separators 2c disposed between the positive and negative electrodes 2a and 2b. The track-shaped roll electrode assembly 2 has a straight section St and a curved section C.
The N/P ratio is determined depending on which electrode is disposed on the outer surface of the separator 2c. That is, when the curved section “C” of the roll electrode assembly 2 is unrolled in a flat state, as shown in FIG. 3 5, there is a length difference ΔL between the positive and negative electrodes 2a and 2b.
Therefore, a difference between the amount of the positive active material and the amount of the negative active material can be obtained according to the following equation:
A=ΔLXT
where,
    • A is the difference between the amount of the positive active material and the amount of the negative active material;
    • ΔL is the length difference between the positive and negative electrodes; and
    • T is a thickness of the active material of the electrode.
The difference between the amount of the negative and positive active material causes variations in the capacity ratio difference between the amount of negative active material and positive active material, respectively, of the negative and positive electrodes located adjacent to each other with the separator disposed there between. That is, a region C where the N/P ratio is less than 1 appears on the roll electrode assembly 2 as shown in FIG. 4.
In the region C, the capacity of the positive electrode 2a is larger than that of the negative electrode 2b, as shown in FIG. 5. Therefore, the ions released from the positive electrode 2a are not be completely absorbed into the negative electrode 2b but precipitated as a metal oxide material 32 on a surface of the negative electrode 2b.
However, in the conventional battery, since the thickness of the separator 2c is uniform, the precipitated metal oxide material 10 continues to grow, then may penetrate the separator 2c, and contact the positive electrode 2a as charging and discharging are repeated. This may cause the battery to explode, deteriorating the safety of the secondary battery.
SUMMARY OF THE INVENTION
Therefore, the present invention has been made in an effort to solve the above-described problems of the conventional secondary battery.
It is an objective of the present invention to provide an electrode assembly for a secondary battery in which any hazardous problems, which may occur by the precipitation of the metal oxide, can be prevented, thereby improving safety of the secondary battery.
To achieve the above objective, the present invention provides a roll electrode assembly of a secondary battery including a positive electrode, a negative electrode, and first and second separators rolled into a plurality of turns.
The first separator is disposed between outer surface of the turns of the negative electrode and inner surface of the turns of the positive electrode. The second separator is disposed between outer surface of the turns of the positive electrode and inner surface of the turns of the negative electrode. The thickness of the second separator is less than that of the first separator.
Preferably, the thickness of the first separator is 2-3 times that of the second separator.
More preferably, the thickness of the first separator is about 30-45 μm, while the thickness of the second separator is about 15-23 μm.
When the roll electrode assembly is for a prism type battery, thus having, in a cross section, a straight portion and a curved portion, the thickness of the first and second separators are equal in the straight portion.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention, and, together with the description, serve to explain the principles of the invention:
FIG. 1 is a side sectional view of a conventional secondary battery taken from FIG. 1 of Applicant's U.S. Pat. No. 6,258,478 issued on 10 Jul. 2001, where an electrode assembly according to a preferred embodiment of the present invention can be employed;
FIG. 2 is a plane view of a conventional electrode assembly;
FIG. 3 is an enlarged view illustrating a curved portion of a roll electrode assembly according to a preferred embodiment of the present invention;
FIG. 4 is a view illustrating an unrolled state of a roll electrode assembly according to a preferred embodiment of the present invention; and
FIG. 5 is a view illustrating an unrolled state of a conventional roll electrode assembly.
 DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Reference will now be made in detail to the present preferred embodiment of the invention, an example of which is illustrated in the accompanying drawing.
FIG. 3 shows a curved portion of a roll electrode assembly according to a preferred embodiment of the present invention.
The roll electrode assembly of the present invention is made by rolling a group of plates.
That is, the group of plates comprises a negative electrode 2b, first and second separators 2cc and 2c disposed on opposite surfaces of the negative electrode 2b, and a positive electrode 2a.
As a feature of the present invention, the thickness of the first separator 2cc is different from that of the second separator 2c.
Describing more in detail, in the roll electrode assembly, the first separator 2cc is disposed between the outer surface of the negative electrode 2b and the inner surface of the positive electrode 2a. The second separator 2c is disposed between the inner surface of the negative electrode 2b and the outer surface of the positive electrode 2a.
Therefore, as described above, in the curved portion of the roll electrode assembly, the adjacent negative and positive electrodes 2b and 2a, between which the first separator 2cc is disposed, has the N/P ratio less than 1. Accordingly, the first separator 2cc is designed to be greater than the second separator 2c.
That is, in the unrolled state of the roll electrode assembly as shown in FIG. 4, the first and second separators 2cc and 2c, which have a different thickness, are alternately disposed between the positive and negative electrodes 2a and 2b. Particularly, it is shown that the thickness of the first separator 2cc is greater than that of the second separator 2c. The thickness of the first separator is 2-3 times that of the second separator. More preferably, the thickness of the first separator is about 30-45 μm, while the thickness of the second separator is about 15-23 μm.
In the straight portion St of the roll electrode assembly which has no portion having the a N/P ratio less than 1, the thickness of the first separator 2cc may be equal to that of the second separator 2c.
Accordingly, the cross-sectional distance cut between adjacent positive and negative electrode electrodes where the N/P ratio is less than 1 becomes longer due to the thicker separator 2cc. As the result, even when the metal oxide material is precipitated and is grown due to the length difference in local length between the positive and negative electrodes at the curved portion of the roll electrode assembly, the precipitated metal oxide material can not penetrate the separator 2cc and make contact with the positive electrode, thereby preventing the a short circuit and an explosion of the battery.
It is to be understood that the form of the invention shown and described is to be taken as exemplary, presently preferred embodiments. Various modifications and changes may be made without departing from the sprit and scope of the invention as set forth in the claims. It is intended that the following claims be interpreted to embrace all such modifications and changes.
For example, the concept of the present invention may be applied to cylindrical type batteries that also have the N/P ratio less than 1 between the positive and negative electrodes.

Claims (11)

What is claimed is:
1. A roll electrode assembly of a secondary battery, comprising:
a positive electrode deposited with a positive active material;
a negative electrode deposited with a negative active material and adjacent to the positive electrode; and
successive turns of a separator disposed between the positive and negative electrodes, the successive turns having alternately different thicknesses,
wherein, the adjacent positive and negative electrodes have variable negative-to-positive active material ratio capacity ratios, and a thickness of the separator disposed between a portion of the adjacent positive and negative electrodes where the negative-to-positive active material capacity ratio is less than 1 is greater than that a thickness of the other another portion where the capacity ratio is higher than 1.
2. A roll electrode assembly of a secondary battery, comprising:
a positive electrode rolled having a plurality of turns;
a negative electrode rolled having a plurality of turns, each turn of the negative electrode being adjacent to each turn of the positive electrode; and
first and second separators each rolled to have a plurality of turns, each turn of the first separator being disposed between each outer surface of the turns of the negative electrode and each inner surface of the turns of the positive electrode, and each turn of the second separator being disposed between each outer surface of the turns of the positive electrode and each inner surface of the turns of the negative electrode,
wherein the thickness of the first separator is greater than that of the second separator, and
wherein when the roll electrode assembly is for a battery having, in a cross section, a straight portion and a curved portion, with the thickness of the first and the second separators equal in the straight portion.
3. The roll electrode assembly of claim 2 wherein the thickness of the first separator is 2-3 times that of the second separator.
4. The roll electrode assembly of claim 2 wherein the thickness of the first separator is about 30-45 μm.
5. The roll electrode assembly of claim 2 wherein the thickness of the second separator about 15-23 μm.
6. A roll electrode assembly of a secondary battery, comprising:
a positive electrode deposited with a positive active material;
a negative electrode deposited with a negative active material and adjacent to the positive electrode;
a first separator disposed between the positive and negative electrodes; and
a second separator disposed between the positive and negative electrodes, wherein,;
the adjacent positive and negative electrodes have having variable negative-to-positive active material ratio capacity ratios, and the first and second separators having different thicknesses, with a thickness of the first separator disposed between a portion of the adjacent positive and negative electrodes where the negative-to-positive active material capacity ratio is less than 1 is being greater than that of a thickness of the second separator disposed between a portion of the adjacent positive and negative electrodes where the negative-to-positive active material capacity ratio is higher than 1.
7. The roll electrode assembly of claim 6 wherein the thickness of the first separator is 2-3 times that of the second separator.
8. The roll electrode assembly of claim 6 wherein the thickness of the first separator is about 30-45 μm.
9. The roll electrode assembly of claim 6 wherein the thickness of the second separator is about 15-23 μm.
10. A roll electrode assembly of a secondary battery, comprising:
a positive electrode rolled into a plurality of turns;
a negative electrode rolled into a plurality of turns, each turn of the negative electrode being adjacent to each turn of the positive electrode; and
first and second separators each rolled to have a plurality of turns, each turn of the first separator being disposed between a corresponding neighboring outer surface of the turns of the negative electrode and a corresponding neighboring inner surface of the turns of the positive electrode, and each turn of the second separator being disposed between a corresponding neighboring outer surface of the turns of the positive electrode and a corresponding neighboring inner surface of the turns of the negative electrode;
a thickness of the first separator being greater than a thickness of the second separator in a curved portion of a cross-section of the secondary battery, and the thicknesses of the first and the second separators being equal in a straight portion of the cross-section of the secondary battery.
11. A roll electrode assembly of a secondary battery, comprising:
a positive electrode deposited with a positive active material;
a negative electrode deposited with a negative active material neighboring the positive electrode;
a first separator disposed between the positive and negative electrodes; and
a second separator disposed between the positive and negative electrodes;
adjacent positive and negative electrodes having variable negative-to-positive active material capacity ratios, and the first and the second separators having different thicknesses alternately positioned between the positive and negative electrodes, with a thickness of the first separator disposed between a portion of the adjacent positive and negative electrodes where the negative-to-positive active material capacity ratio is less than 1 being greater than a thickness of the second separator disposed between a portion of the adjacent positive and negative electrodes where the negative-to-positive active material capacity ratio is higher than 1; and
the thicknesses of the first and the second separators being equal in a straight portion of a cross-section of the secondary battery.
US12/885,019 1998-09-03 2010-09-17 Electrode assembly for secondary battery and method for fabricating the same Expired - Lifetime USRE43241E1 (en)

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KR98-36259 1998-09-03
KR1019980036259A KR100274895B1 (en) 1998-09-03 1998-09-03 Manufacturing method of secondary battery
US09/292,483 US6329097B1 (en) 1998-09-03 1999-04-15 Electrode assembly for secondary battery and method for fabricating the same
US12/885,019 USRE43241E1 (en) 1998-09-03 2010-09-17 Electrode assembly for secondary battery and method for fabricating the same

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US20150340731A1 (en) * 2014-05-21 2015-11-26 Samsung Sdi Co., Ltd. Electrode structure and lithium battery including the same
US10263290B2 (en) 2014-07-23 2019-04-16 Sanyo Electric Co., Ltd. Nonaqueous electrolyte secondary battery

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KR100322100B1 (en) * 1999-12-08 2002-02-06 김순택 Sealed battery
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JP2004171999A (en) * 2002-11-21 2004-06-17 Hitachi Maxell Ltd Nonaqueous electrolyte secondary battery
JP4404612B2 (en) * 2002-11-29 2010-01-27 三洋電機株式会社 Nonaqueous electrolyte secondary battery
JP4439226B2 (en) * 2003-09-11 2010-03-24 日立マクセル株式会社 Nonaqueous electrolyte secondary battery
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JP4803201B2 (en) * 2008-04-04 2011-10-26 トヨタ自動車株式会社 Winding type battery and method of manufacturing winding type battery
US20100178556A1 (en) * 2009-01-15 2010-07-15 Veselin Manev Negative electrode for lithium ion battery
JP2011238375A (en) * 2010-05-06 2011-11-24 Hitachi Vehicle Energy Ltd Secondary battery and method for manufacturing the same
KR101385732B1 (en) * 2012-11-22 2014-04-17 주식회사 엘지화학 Electrode assembly composed of electrode units with equal lengths and different widths, battery cell and device including the same
US9837682B1 (en) 2016-08-29 2017-12-05 Microsoft Technology Licensing, Llc Variable layer thickness in curved battery cell
KR102509516B1 (en) * 2019-05-03 2023-03-13 주식회사 엘지에너지솔루션 Electrode assembly and manufacturing method thereof
FR3105599A1 (en) * 2019-12-20 2021-06-25 Commissariat A L'energie Atomique Et Aux Energies Alternatives M-ION TYPE COIL ACCUMULATOR

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US20150340731A1 (en) * 2014-05-21 2015-11-26 Samsung Sdi Co., Ltd. Electrode structure and lithium battery including the same
US10263290B2 (en) 2014-07-23 2019-04-16 Sanyo Electric Co., Ltd. Nonaqueous electrolyte secondary battery

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KR100274895B1 (en) 2000-12-15
JP2000082484A (en) 2000-03-21
JP4603108B2 (en) 2010-12-22
KR20000018603A (en) 2000-04-06
US6329097B1 (en) 2001-12-11

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