i, Eric Vance, hereby declare:
`
`”that l possess advanced knowledge ofthe Japanese and English languages. l have 5 gears of professional
`tra nslafion experience and 5 hold a Bachelor of Arts degree in Japanese and a Bachelor of Science degree
`in Physiology. 1 have 2.5 years of professional translation experience and training with a dedicated
`patent translation firm that specializes in chemical, electrical, optical, mechanical, and other technical
`
`fields. I hold a lLPT N1 Certification in lapanese linguistics.
`
`The attached japanese into English translation has been translated by me and to the best of my
`knowledge and belief, it is a true and accurate translation of5P2m7—294111A, with publication date
`November 8, 21387.
`
`I declare that all statemen‘s made above of my own knowledge are true and that all statements made
`on information and belief are believed to be true. I have been warned and understand that willful false
`
`statements and the like are punishable by fine or imprisonment, or both, under § 1901 of Title 18 of the
`United States Code-
`
`I declare under penalty of perjury that the foregoing is true and correct.
`
`Executed on June 12, 2020 in South lordan, Utah.
`
`5;?“
`
`Eric Vance
`
`Stateor UT Countyol Salt Lelia tic-Until
`Subscribed and sworn to (or affirmed) before me on this
`
`ll'%yd 00M
`20 ‘20 by
`" c Vance
`tomemmebasis
`
`
`)
`
`olsatisfactoryevidenceto
`eperson()whoappearedbeforeme.
`NotaryrSignature
`020% git/434
`May 26, 2014
`
`MERCEDES ANNTIOMETTE KELLEY
`arm:
`a” ‘3 Notary Public State of Utah
`a Comm. No 712186
`v
`‘* _
`__5 My Commission Expires on
`
`
`
`Notary Com mission Expiry
`
`JLab/Cambridge, Exh. 1006, p. 1
`
`JLab/Cambridge, Exh. 1006, p. 1
`
`

`

`
`
`
`
`JP 2007-294111 A November 8, 2007
`
`(19) Japan Patent Office (JP)
`
`
`
`(12) JAPANESE UNEXAMINED PATENT APPLICATION PUBLICATION (A)
`(11) Patent Application
`
`Publication No. JP 2007-294111
`(P2007-294111A)
`November 8, 2007 (Heisei 11)
`(43) Publication Date:
`
`
`Theme Code (Reference)
`10/04
` W
`5H011
`2/34
` B
`5H028
`2/02
` G
`5H043
`
`
`
`
`
`(Total 13 pages)
`OL
`Total No. of Claims: 6
`(71) Applicant
`000003539
`
`Toshiba Battery Co., Ltd.
`
`2-2-15 Sotokanda, Chiyoda-ku,
`
`Tokyo-to
`(74) Agent
`100058479
`
`Takehiko Suzue,
`
`Patent Attorney
`(74) Agent
`100091351
`
`Akira Kono,
`
`Patent Attorney
`(74) Agent
`100088683
`
`Makoto Nakamura,
`
`Patent Attorney
`(74) Agent
`100108855
`
`Masatoshi Kurata,
`
`Patent Attorney
`(74) Agent
`100075672
`
`Takashi Mine,
`
`Patent Attorney
`(74) Agent
`100109830
`
`Toshihiro Fukuhara,
`
`Patent Attorney
`Continued on final page
`
`
`
`
`
`(51) Int. Cl.
`(2006.01)
`10/04
`
`H01M
`(2006.01)
`2/34
`
`H01M
`(2006.01)
`2/02
`
`H01M
`
`
`
`
`
`Examination Request: Not Yet
`(21) Application No.
`JP 2006-116981
`(22) Date of Filing
`April 20, 2008
`
`(Heisei 18)
`
`
`FI
`H01M
`H01M
`H01M
`
`
`
`
`FIG. 1
`
`(54) [Title of Invention] SMALL BATTERY
`
`(57) [Abstract]
`[Problem] To provide a small battery capable of
`improving heavy load characteristics without impairing
`productivity.
`[Solution] A small battery provided with a container and
`a flat electrode group in which a laminate containing a
`positive electrode 1 and a negative electrode 2 is spirally
`wound, the flat electrode group being stored in the
`container, wherein the flat electrode group is integrated
`with a winding axis core 7 by spirally winding the laminate
`while at least one of the positive electrode 1 and the
`negative electrode 2 is fixed to the winding axis core 7.
`[Selected Drawing]
`FIG. 1
`
`
`JLab/Cambridge, Exh. 1006, p. 2
`
`

`

`
`
`(2)
`
`JP 2007-294111 A November 8, 2007
`
`[Scope of Patent Claims]
`[Claim 1]
`
`A small battery comprising a container and a flat electrode group in which a laminate containing a
`positive electrode and a negative electrode is spirally wound, the flat electrode group being stored in the container,
`
`wherein the flat electrode group is integrated with a winding axis core by spirally winding the laminate
`while at least one of the positive electrode and the negative electrode is fixed to the winding axis core.
`[Claim 2
`
`The small battery according to claim 1, wherein the container comprises a positive electrode case
`doubling as a positive electrode terminal, a negative electrode case doubling as a negative electrode terminal,
`and an insulation gasket interposed between the positive electrode case and the negative electrode case, and a
`seal of the container is created by caulking performed on the positive electrode case or the negative electrode
`case.
`[Claim 3]
`
`The small battery according to claim 2, further comprising:
`
`a positive electrode terminal part disposed between the positive electrode case and one end face of the
`electrode group;
`
`a negative electrode terminal part disposed between the negative electrode case and another end face of
`the electrode group;
`
`a positive electrode lead part for ensuring continuity between the positive electrode terminal part and
`the positive electrode, the positive electrode lead part being integrated with the winding axis core; and
`
`a negative electrode lead part for ensuring continuity between the negative electrode terminal part and
`the negative electrode, the negative electrode lead part being integrated with the winding axis core.
`[Claim 4]
`
`The small battery according to claim 3, wherein an insulating member is disposed between the positive
`electrode case and the one end face of the electrode group, between the negative electrode case and the other end
`face of the electrode group, or both.
`[Claim 5]
`
`The small battery according to claim 2, further comprising:
`
`a first insulating member fixed to one end of the winding axis core so as to cover one end face of the
`electrode group;
`
`a second insulating member fixed to another end of the winding axis core so as to cover another end
`face of the electrode group;
`
`a positive electrode terminal part disposed between an inner face of the positive electrode case and the
`first insulating member;
`
`a negative electrode terminal part disposed between an inner face of the negative electrode case and the
`second insulating member;
`
`a positive electrode lead part for ensuring continuity between the positive electrode terminal part and
`the positive electrode, the positive electrode lead part being integrated with the winding axis core; and
`
`a negative electrode lead part for ensuring continuity between the negative electrode terminal part and
`the negative electrode, the negative electrode lead part being integrated with the winding axis core.
`[Claim 6]
`
`The small battery according to any one of claims 1 to 5, being a coin or button cell.
`[Detailed Description of the Invention]
`[Technical Field]
`[0001]
`The present invention relates to a small battery provided with a winding electrode group (for example,
`
`a button cell or a coin cell).
`[Background Art]
`[0002]
`The spread of mobile electronic/communication devices such as small video cameras, mobile phones,
`
`PDAs, and laptops is remarkable, rechargeable batteries such as lithium-ion rechargeable batteries and nickel-
`metal hydride rechargeable batteries have been applied thereto as power sources, and development for size
`reduction and capacity increase has been performed to a great extent.
`[0003]
`
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`JLab/Cambridge, Exh. 1006, p. 3
`
`

`

`
`
`(3)
`
`JP 2007-294111 A November 8, 2007
`
`In addition to the trend of further size reduction of mobile devices, rechargeable batteries are required
`
`as power sources for devices for which size reduction as wristwatches is necessary, and small rechargeable
`batteries such as button cells and coin cells have come to be applied to uses of backup power supplies for SRAM
`and RTC, for which discharge is performed at a light load wherein the discharge current is about a few μA to a
`few dozen μA, and main power supplies for wristwatches not requiring battery replacement.
`[0004]
`That illustrated in FIG. 10 is a typical structure for these small rechargeable batteries such as button
`
`cells and coin cells. That is, an object wherein a positive electrode case 21 doubling as a positive electrode
`terminal and a metal negative electrode case 22 doubling as a negative electrode are caulked together via an
`insulation gasket 23 is used as a hermetically sealed container. One each of a tablet-shaped positive electrode 24
`and negative electrode 25 having diameters smaller than the diameter of an opening of the insulation gasket 23
`are stored within this hermetically sealed container. A separator 26 impregnated with an electrolytic solution is
`interposed between the positive electrode 24 and the negative electrode 25.
`[0005]
`Because such small rechargeable batteries such as button cells and coin cells have simple structures,
`
`they have excellent mass producibility and the characteristic of being capable of size reduction.
`[0006]
`However, small rechargeable batteries such as button cells and coin cells that have the structure
`
`indicated above have insufficient properties when discharging at high current, which is required for the main
`power sources of small mobile devices, and they are not suited as main power sources of small mobile devices.
`[0007]
`Meanwhile, due to size reduction of mobile devices such as small video cameras, mobile phones, PDAs,
`
`and laptops, size reduction is also necessary for lithium-ion rechargeable batteries, nickel-hydride rechargeable
`batteries, and the like, which have been used as main power sources (for example cited documents 1 and 2). A
`method for manufacturing lithium-ion rechargeable batteries and nickel-metal hydride rechargeable batteries
`will be briefly described. First, an active material layer is applied or filled on a current collector composed of a
`metal foil or a metal net to form electrodes. After welding current-collecting tab terminals to the formed
`electrodes, these electrodes are wound or laminated to form an electrode group. Additionally, the current
`collecting tab terminals taken out from the electrode group are bent in a complicated manner and welded to a
`safety element, an electrode pin, an electrode can, and the like to manufacture a battery. Manufacture of these
`rechargeable batteries requires such complicated manufacturing steps, and the work is complicated. Furthermore,
`in order to prevent short-circuiting of the tab terminals, it is necessary to provide a space or part within the
`battery or to incorporate many parts such as safety elements within the battery. Therefore, size reduction is
`extremely difficult for these rechargeable batteries, and the limit has currently substantially been reached.
`[Cited Document 1] JP H11-345626 A
`[Cited Document 2] JP H11-354150 A
`[Disclosure of Invention]
`[Problem to Be Solved by Invention]
`[0008]
`An object of the present invention is to improve heavy load characteristics of small batteries such as
`
`button cells and coin cells without impairing productivity.
`[Means for Solving Problem]
`[0009]
`The small battery according to the present invention is a small battery provided with a container and a
`
`flat electrode group in which a laminate containing a positive electrode and a negative electrode is spirally wound,
`the flat electrode group being stored in the container,
`
`wherein the flat electrode group is integrated with a winding axis core by spirally winding the laminate
`while at least one of the positive electrode and the negative electrode is fixed to the winding axis core.
`[0010]
`Here, flat electrode group means an electrode group having a structure wherein the height of the
`
`electrode group in the winding axis core direction is smaller than the size in the direction perpendicular to the
`winding axis.
`[Effect of Invention]
`[0011]
`
`
`According to the present invention, it is possible to provide a small battery capable of improving
`
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`30
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`JLab/Cambridge, Exh. 1006, p. 4
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`

`

`
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`(4)
`
`JP 2007-294111 A November 8, 2007
`
`heavy load characteristics without impairing productivity.
`[Best Mode for Carrying out Invention]
`[0012]
`As a result of repeated research relating to improvement of heavy load characteristics of small batteries, the
`
`present inventors have discovered a method for safely, and with high productivity, storing a wound electrode group
`within a case of a small battery such as a button cell or a coin cell. Thereby, heavy load characteristics have been
`dramatically improved compared to conventional small batteries.
`[0013]
`That is, it was found that by using a container having a sealed structure in which a metal negative electrode
`
`case doubling as a negative electrode terminal and a positive electrode case doubling as a positive electrode terminal
`are fitted via an insulation gasket, and furthermore which is caulked by caulking the positive electrode case or negative
`electrode case, and by storing in the container an electrode group having a laminate including a positive electrode and
`a negative electrode wound in a spiral, it is possible to provide a small battery having excellent heavy load
`characteristics.
`[0014]
`Winding a thin positive electrode and negative electrode via a separator in lithium-ion rechargeable batteries
`
`and nickel-metal hydride rechargeable batteries, which are used as main power sources for small mobile devices,
`enables enlargement of the counter-electrode area of the negative electrode and the positive electrode and extraction
`of high current. However, as described above, the manufacturing process is complicated, and the number of parts is
`extremely high for the sake of ensuring safety and the like. Thus, it was thought that it was impossible to store the
`electrode group structure within a small battery such as a button cell or a coin cell.
`[0015]
`Therefore, the present inventors attempted to change the approach away from conventional art, and by
`
`incorporating at least a winding axis core into the electrode group structure, and as needed, an insulation plate and
`contacting terminals between electrodes and external terminals, enabled efficient storage of an electrode group in
`which a positive electrode, a negative electrode, and a separator are wound in a few layers to a few dozen layers within
`a case of a small battery such as a button cell or a coin cell while preserving the benefits of safety and excellent
`productivity.
`[0016]
`
`[0017]
`First, when winding a positive electrode and a negative electrode in a spiral via a separator, by incorporating
`
`the winding axis core into the electrode group while being integrated with the negative electrode and/or the positive
`electrode, it was possible to manufacture a wound electrode group capable of being housed in a case of a small battery
`such as a button cell or a coin cell. It is desirable that the winding axis core or a part of a base part thereof be formed
`from an insulating material such as polyethylene, polypropylene resin, glass, or ceramic.
`[0018]
`Next, connection between the electrode group and the metal cases doubling as external terminals will be
`
`described. For comparatively large lithium-ion rechargeable batteries such as cylindrical or prismatic, the tab terminals
`are welded to a center part of the electrode group or the winding member, and after bending this, it is welded to a
`safety element or sealing pin, and current collection is performed. However, productivity is poor because the bending
`process is complicated. Thus, it was possible to simplify the structure by installing a terminal on the winding axis core
`to be incorporated into the electrode group to connect the electrode and the metal case doubling as an external terminal.
`The method for connecting the electrode to this terminal includes crimping, welding such as resistance welding and
`ultrasonic welding, bonding such as with a conductive adhesive, and the like, but it is not particularly limited.
`Additionally, the method of connecting this terminal to the metal case doubling as an external terminal includes
`welding such as resistance welding and ultrasonic welding, bonding such as with a conductive adhesive, contact
`between the terminal and the battery case, and the like, but it is not particularly limited. However, for current collection
`by contact, it is desirable to improve current collection properties using a metal net, metal powder, carbon filler,
`conductive paint, or the like.
`[0019]
`Next, it is desirable to establish an insulating member between the electrode group and the battery case to
`
`prevent short-circuiting. The insulating member is not particularly limited insofar as the insulating properties are
`maintained, but an insulating plate made of polyethylene or polypropylene resin, a film made of PET or polyimide, or
`the like can be used. The insulating member may be disposed between the positive electrode case and the electrode
`
`
`
`The present inventors will describe below how the present invention was realized.
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`JLab/Cambridge, Exh. 1006, p. 5
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`

`

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`(5)
`
`JP 2007-294111 A November 8, 2007
`
`group, between the negative electrode case and the electrode group, or both.
`[0020]
`Furthermore, this insulating member may be integrated with the winding axis core. As the structural
`
`stability of the electrode group is improved by integrating the insulating member and the winding axis core, it is
`desirable to integrate the insulating member and the winding axis core.
`[0021]
`Next, for the electrodes, both the positive and negative electrodes may use a conventional granule
`
`mixture molding method or a method for filling a mixture on a metal substrate such as a metal net or nickel foam,
`but from the viewpoint that it is easy to produce thin electrodes, the slurry mixture may be applied to a metal
`foil and dried, and furthermore, this may be used after rolling. When using an electrode coated with a mixture
`layer containing an active substance on a metal foil as described above, it is preferable in terms of volumetric
`efficiency that the electrodes used within the electrode group are those in which an active substance layer is
`formed on both surfaces of the metal foil. To facilitate connection for the portion connected to the terminal on
`one side of the electrode group, among electrode components, it is particularly preferable to expose metal foil.
`Concerning this, an electrode on which an active substance is formed on only this portion and only one face may
`be used, or the active substance layer may be removed only on one side after the active substance layer is formed
`on both sides.
`[0022]
`Next, the main point of the present battery is a battery structure that includes electrodes. The positive
`
`electrode active substance is not limited, and any substance, such as metal oxides such as MnO2, V2O5, Nb2O5,
`LiTi2O4, Li4Ti5O12, LiFe2O4, lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium nickel
`manganese oxide, lithium nickel cobalt oxide, lithium cobalt manganese oxide, and lithium nickel cobalt
`manganese oxide, inorganic compounds such as fluorinated graphite and FeS2, or organic compounds such as
`polyaniline and polyacene structures, can be adopted. However, among these, lithium cobalt oxide, lithium
`nickel oxide, lithium manganate, a mixture thereof, or a lithium-containing oxide in which a part of these
`elements is replaced with another metal element is more preferable because of high operating potential and
`excellent cycle characteristics, and in a small rechargeable battery which may be used for a long period of time,
`lithium cobalt oxide is further preferable because it has a high capacity, low reactivity with an electrolytic
`solution and water, and is chemically stable.
`[0023]
`Next, the negative electrode active material of the present battery is not limited, and any, such as metallic
`
`lithium, lithium alloys such as Li-Al, Li-In, Li-Si, Li-Si, Li-Ge, Li-Bi, and Li-Pb, organic compounds such as
`polyacene structures, carbonaceous materials capable of occluding and releasing lithium, oxides such as Nb2O5,
`LiTi2O4, Li4Ti5O12, and Li-containing silicon oxides, and Li-containing nitrides, can be adopted. Carbonaceous
`materials capable of occluding and releasing Li are preferable because of excellent cycle characteristics, a low
`operating potential, and a high capacity, and particularly, even toward to the end of discharge, carbonaceous
`materials having a developed graphite structure such as natural graphite, artificial graphite, expanded graphite,
`a mesophase pitch fired body, or a mesophase pitch fiber fired body are more preferable because the decrease in
`battery operating voltage is low.
`[0024]
`[Examples]
`
`Examples of the present invention will be described in detail below with reference to drawings.
`[0025]
`(Example 1)
`
`A cross-sectional view of a battery of example 1 is illustrated in FIG. 1. A production method of the
`battery of example 1 will be described below.
`[0026]
`First, 5 parts by weight of acetylene black and 5 parts by weight of graphite powder were added as a
`
`conductive agent and 5 parts by weight of polyvinylidene fluoride was added as a binder to 100 parts by weight
`of LiCoO2, and the mixture was diluted using N-methylpyrrolidone and mixed to obtain a positive electrode
`mixture in a slurry form. Next, this positive electrode mixture was coated on one surface of a 0.02 mm-thick
`aluminum foil, serving as a positive electrode current collector, by the doctor blade method and dried to form a
`positive electrode active substance-containing layer on the aluminum foil surface. Following this, coating and
`drying were repeated until the coating film thickness of the positive electrode active substance-containing layer
`was 0.13 mm on both sides to prepare, as illustrated in FIG. 2, a positive electrode 1 having a positive electrode
`
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`JLab/Cambridge, Exh. 1006, p. 6
`
`

`

`
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`(6)
`
`JP 2007-294111 A November 8, 2007
`
`active substance-containing layer 1b laminated on both surfaces of a positive electrode current collector 1a. Next, a 2
`mm portion of the positive electrode active substance-containing layer was removed from both ends of the positive
`electrode 1, exposing the aluminum layer to form a current-carrying part 1c, and thereby obtaining a positive electrode
`plate cut into a length 3.3 mm in width, 150 mm in length, and 0.13 mm in thickness.
`[0027]
`Next, 2.5 parts by weight each of styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) were
`
`added as a binder to 100 parts by weight of a graphitized mesophase pitch carbon fiber powder, and this mixture was
`diluted using ion-exchanged water and mixed to obtain a negative electrode mixture in a slurry form. Coating and
`drying of the obtained negative electrode mixture on a copper foil with a thickness of 0.02 mm, serving as a negative
`electrode current collector, were repeated in the same manner as the positive electrode so that the thickness of the
`negative electrode active substance-containing layer was 0.12 mm to prepare, as illustrated in FIG. 3, a negative
`electrode 2 having a negative electrode active substance-containing layer 2b laminated on both surfaces of a negative
`electrode current collector 2a. Next, a 2 mm portion of the negative electrode active substance-containing layer was
`removed from both ends of the negative electrode 2, exposing the copper layer to form a current-carrying part 2c, and
`thereby preparing a negative electrode plate cut into a length 3.3 mm in width, 150 mm in length, and 0.12 mm in
`thickness.
`[0028]
`Next, positive and negative electrode terminals having the structures illustrated in FIGS. 4 and 5 were
`
`prepared. FIG. 4(a) is a side surface view of a positive electrode terminal when viewed from a slit side, and FIG. 4(b)
`is a plan view of the positive electrode terminal. The positive electrode terminal 4 has a disc-shaped positive electrode
`terminal plate 4a (positive electrode terminal part), a bar-shaped terminal connection part 4b (positive electrode lead
`part) electrically connected to the positive electrode terminal plate 4a, and a slit 4c formed on the terminal connection
`part 4b. This positive electrode terminal 4 is formed, for example, from aluminum. Meanwhile, FIG. 5(a) is a plan
`view of a negative electrode terminal, and FIG. 5(b) is a side surface view of the negative electrode terminal when
`viewed from a slit side. The negative electrode terminal 5 has a disc-shaped negative electrode terminal plate 5a
`(negative electrode terminal part), a bar-shaped terminal connection part 5b (negative lead part) electrically connected
`to the negative electrode terminal plate 5a, and a slit 5c formed on the terminal connection part 5b. This negative
`electrode terminal 5 is formed, for example, from stainless steel.
`[0029]
`As illustrated in FIG. 6, after the current-carrying part 1c of the positive electrode 1 was inserted into the slit
`
`4c in the terminal connection part 4b of the positive electrode terminal 4, pressure was applied to the terminal
`connection part 4b from the outside, and the current-carrying part 1c was crimped to the terminal connection part 4b.
`Furthermore, after the current-carrying part 2c of the negative electrode 2 was inserted into the slit 5c in the terminal
`connection part 5b of the negative electrode terminal 5, pressure was applied to the terminal connection part 5b from
`the outside, and the current-carrying part 2c was crimped to the terminal connection part 5b.
`[0030]
`Next, a terminal to which an electrode is connected was integrated with a winding member illustrated in FIG.
`
`7. FIG. 7(a) is a plan view of a winding member 6 when viewed from the top, (b) is a side surface view of the winding
`member 6, and (c) is a plan view of the winding member 6 when viewed from the bottom. The winding member 6, as
`illustrated in FIG. 7, is provided with a winding axis core 7, and insulation plates 8 and 9 (first and second insulating
`members) integrated with the upper end and lower end of the winding axis core 7. The winding axis core 7, as
`illustrated in FIG. 7(a), has a notch part 7a into which the terminal connection part 5b of the negative electrode terminal
`5 is fitted. Furthermore, the winding axis core 7, as illustrated in FIG. 7(c), is provided with a notch part 7b into which
`the terminal connection part 4b of the positive electrode terminal 4 is fitted at a position opposite to the notch part 7a.
`As illustrated in FIG. 7(b) and (c), a circular groove part 9a for accommodating the positive electrode terminal plate
`4a is formed on the insulation plate 9, as the first insulating member. Furthermore, a slit 9b is also formed on the
`insulation plate 9 so as to communicate with the notch part 7b of the winding axis core 7. Meanwhile, as illustrated in
`FIG. 7(a) and (b), a circular groove part 8a for accommodating the negative electrode terminal plate 5a is formed on
`the insulation plate 8, as the second insulating member. Furthermore, a slit 8b is also formed on the insulation plate 8
`so as to communicate with the notch part 7a of the winding axis core 7.
`[0031]
`Next, the winding member 6 and the positive and negative electrode terminals 4 and 5 are integrated. That
`
`is, as illustrated in FIG. 8, the terminal connection part 4b of the positive electrode terminal 4 was inserted into the
`notch part 7b of the winding axis core 7, and the positive electrode terminal plate 4a was disposed in the notch part 9a
`of the insulation plate 9. Furthermore, the terminal connection part 5b of the negative electrode terminal 5 was inserted
`into the notch part 7a of the winding axis core 7, and the negative electrode terminal plate 5a was disposed in the
`groove part 8a of the insulation plate 8. As a result of having inserted the terminal connection parts 4b and 5b into the
`
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`JLab/Cambridge, Exh. 1006, p. 7
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`(7)
`
`JP 2007-294111 A November 8, 2007
`
`notch parts 7a and 7b of the winding axis core 7, the shape of the winding axis core 7 becomes cylindrical.
`[0032]
`One sheet each of a separator 3 composed of a polyethylene microporous film having a width of 3.5 m and a
`
`thickness of 22 μm was sandwiched and fixed between the winding axis core 7 and the positive electrode 1, and between
`the winding axis core 7 and the negative electrode 2, respectively, and the positive electrode 1 and the negative electrode 2
`were spirally wound via the separator 3, thereby preparing a flat electrode group wherein the height of the electrode group
`in the winding axis direction is smaller than its size in the direction perpendicular to the winding axis. A cross-sectional
`view of the electrode group is illustrated in FIG. 9. As illustrated in FIG. 9, the winding axis core 7 wherein the terminal
`connection part 4b (positive electrode lead part) of the positive electrode terminal 4 and the terminal connection part 5b
`(negative electrode lead part) of the negative electrode terminal 5 are integrated is located at the center portion of the wound
`electrode group in which the positive electrode 1 and the negative electrode 2 are spirally wound with the separator 3
`interposed. The insulation plate 8, as the second insulating member, is disposed on the top surface of the wound electrode
`group. The negative electrode terminal plate 5a (negative electrode terminal part) integrated with the terminal connection
`part 5b is disposed on the insulation plate 8. Furthermore, the insulation plate 9, as the first insulating member, is disposed
`on the bottom surface of the wound electrode group. The positive electrode terminal plate 4a (positive electrode terminal
`part) integrated with the terminal connection part 4b is laminated on the insulation plate 9.
`[0033]
`A metal container 11 (formed from, for example, stainless steel such as SUS304) with a bottomed cylindrical shape
`
`and having a reverse part 10 with an open end folded back to the outside was prepared as a negative electrode case doubling
`as a negative electrode terminal. A ring-shaped insulation gasket 12 was fitted into the reverse part 10 of this negative
`electrode case 11. The electrode group was inserted into the negative electrode case 11 so that the negative electrode terminal
`plate 5a thereof was in contact with the inner surface of the negative electrode case 11, and the negative electrode terminal
`plate 5a and the negative electrode case 11 were resistance-welded.
`[0034]
`An aluminum container 13 having a bottomed cylindrical shape was prepared as a positive electrode case doubling
`
`as a positive electrode terminal. The electrode group was inserted into this positive electrode case 13 so that the positive
`electrode terminal plate 4a thereof was in contact with the inner surface of the positive electrode case 13, and the positive
`electrode terminal plate 4a and the positive electrode case 13 were resistance-welded.
`[0035]
`After drying the product obtained by welding the electrode group, the negative electrode case, and the positive
`
`electrode case at 85℃ for 12 hours, a non-aqueous electrolyte solution in which LiBF4 was dissolved as a supporting salt at
`a ratio of 1.5 mol/L was poured into a solvent in which ethylene carbonate and γ-butyl lactone were mixed at a ratio of 1:2
`by volume. After fitting the positive electrode case 13 to the negative electrode case 11, it was turned upside down, and the
`positive electrode case 13 was sealed by implementing swaging to prepare a small button cell rechargeable battery of
`
`example 1 having a thickness of 5.3 mm and a diameter of ⌀ 12 mm.
`
`[0036]
`(Example 2)
`
`Similar to example 1 up to the preparation of the electrode group, a conductive paint in which fine graphite particles
`were dispersed was coated on a portion where the electrode groups contact on the inner surface of the negative electrode
`case and the positive electrode case without implementing welding of the negative electrode terminal and the negative
`electrode case and welding of the positive electrode terminal and the positive electrode case in the electrode group.
`[0037]
`After drying the prepared electrode group at 85℃ for 12 hours, the electrode group was disposed so that the
`
`negative electrode terminal plate of the electrode group was in contact with the inner bottom surface of the negative electrode
`case, which was coated with conductive paint, integrated with the insulation gasket. A non-aqueous electrolyte prepared by
`dissolving LiBF4 as a supporting salt at a ratio of 1.5 mol/L in a solvent obtained by mixing ethylene