JLab/Cambridge, Exh. 1008, p. 1
`JLab/Cambridge v. Varta, 2020-01212
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`JLab/Cambridge, Exh. 1008, p. 2
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`(51) Int. Cl.7
`H01G 9/155
`(21) Application No.
`(22) Filing Date
`(71) Applicant
`
`(72) Inventors
`
`(19) Korea Intellectual Property Office (KR)
`(12) Laid-open Patent Gazette (A)
`
`Laid-open Patent Tuk2003-0087316
`
`(11) Laid-open No.
`(43) Laid-open Date
`
`Tuk2003-0087316
`11/14/2003
`
`10-2002-0025330
`05/08/2002
`Comatech Co., Ltd.
`Kyunggi Venture Building, 10th Floor, 1017 Ingye-dong, Paldal-gu, Suwon-si, Kyunggi-do
`
`FTEC Co., Ltd.
`58-63 Yongsoo-ri, Jungnam-myon, Hwasung-gun, Kyunggi-do
`
`KWON, Kyeong Tae
`Gumgang Villa A-101, 91-16 Wonpyung-ri, Maisong-myon, Hwasung-si, Kyunggi-do
`
`YOON, Cheol Hoon
`Dong-A Apt. 1212 Cheon-ri, Idong-myon, Yongin-si, Kyunggi-do
`
`LEE, Yong Ok
`Hansol Lease Apt. 102-1411, 627-1 Choeup-ri, Paiksa-myun, Cheon-si, Kyunggi-do
`
`HUR, Jin Woo
`77 Seoho-dong, Tongyoung-si, Kyungsangnam-do
`
`ROH, Kwang Chul
`228-11 Galhyun-2-dong, Eunpyung-gu, Seoul
`
`CHUNG, Se Il
`Hyundai 3rd Apt. 302-1103, Geoyeo-dong, Songpa-gu, Seoul
`
`YOON, Hang Sik
`
`(74) Agent
`Request for Examination: Yes
`(54) Coin-Type Electric Double Layer Capacitor and Its Manufacturing Method
`
`Abstract
`
`The present invention relates to a coin-type electric double layer capacitor and its manufacturing method and particularly to the
`coin-type electric double layer capacitor in which components of a unit cell and unit cells are sturdily coupled and its
`manufacturing method. In the present invention the coin-type electric double layer capacitor is comprised by laminating 4 to 6
`unit cells, each consisting of metal cases (20) (20’) having plates (21) (21’) and extended side walls (22) (22’) therefrom,
`polarized electrodes (10) (10’) that are fixed and completed inside the metal cases (20) (20’), a separator (30) laminated in-
`between the polarized electrodes (10) (10’), and a gasket (40), wherein the metal cases (20) (20’) and polarized electrodes (10)
`(10’) are welded by laser under the condition that their centers coincide with each other, and in-between the unit cells (50) a
`fixing member having a disc shaped substrate (61) and a cylindrical coupling part formed by extending therefrom is interposed
`and then welded by laser and coupled under the condition that centers of the metal cases (20) (22’) and fixing member (60)
`coincide with each other, and its manufacturing method is provided. Accordingly, the present invention affords stable coupling
`physically as well as electrically without any eccentricity phenomenon or complicated processes so that it has excellent coupling
`capability and particularly exhibits superior electrical performance without damaging the polarized electrode.
`
`Representative Diagram
`
`
`
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`JLab/Cambridge, Exh. 1008, p. 3
`JLab/Cambridge v. Varta, 2020-01212
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`Laid-open Patent Tuk2003-0087316
`
`
`Fig. 3
`
`Keywords
`
`coin, electric double layer, capacitor, unit cell, electrode, laser, welding
`
`
`Specification
`
`
`Brief Description of the Drawings
`
`Fig. 1 is a partially exploded cross-sectional oblique diagram showing the unit cell of the conventional coin-type electric double
`layer capacitor.
`
`Fig. 2a is an oblique diagram showing the configuration course for the unit cell of a coin-type electric double layer capacitor of
`the prior art.
`
`Fig. 2b is an oblique diagram showing the configuration course for the unit cell of another coin-type electric double layer
`capacitor of the prior art.
`
`Fig. 3 is a cross-sectional diagram of the coin-type electric double layer capacitor according to the present invention.
`
`Fig. 4 is a cross-sectional diagram showing a preferred example of the polarized electrode applied to the present invention.
`
`Fig. 5a to Fig. 5c are cross-sectional diagrams of the configuration intended to describe the manufacturing method of the coin-
`type electric double layer capacitor according to the present invention.
`
`* Description of reference numbers for key pacts of the drawings *
`
`10, 10: polarized electrode 12, 12’: metal current collector
`
`12a: recessed part 14, 14’: powder activated carbon slurry
`
`20, 20’: metal case 20, 21’: plate
`
`22, 22’: side wall 30: separator
`
`40: gasket 50: unit cell
`
`60: fixing member 61: substrate
`
`62: coupling part 70, 70’: terminal
`
`80: cladding R: laser beam
`
`
`Detailed Description of the Invention
`
`
`Objective of the Invention
`
`Technology to Which the Invention Belongs and Available Art of the Field
`
`
`
`
`The present invention relates to a coin-type electric double layer capacitor and its manufacturing method and more specifically to
`the coin-type electric double layer capacitor in which a metal case and a polarized electrode are welded by laser under the
`condition that their centers coincide with each other to configure a unit cell, and a fixing member is interposed in-between such
`unit cells and welded by laser to afford excellent electrical performance and electrically stable coupling and its manufacturing
`method.
`
`Recently, in addition to advancement of electronic devices, home appliances industrial devices and the like, development of high
`end, small-size and light-weight electronic parts are being promoted. Accordingly there is a demand for multi-functional parts as
`
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`JLab/Cambridge, Exh. 1008, p. 4
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`Laid-open Patent Tuk2003-0087316
`
` a
`
` result of diversification of electronic parts. One such example is combination of the functions of a secondary battery and a
`capacitor, wherein use of the electric double layer capacitor utilizing the electrostatic charge phenomenon which occurs in the
`electric double layer formed at different interfaces is increasing day by day.
`Because the electric double layer capacitor is not accompanied by any chemical reactions unlike batteries, its extent of
`deterioration caused by repeated charging and discharging operations is very small. Therefore, the electric double layer capacitor
`is a device not requiring maintenance and used for a wide range of applications including the backup power supply for memory
`devices in particular.
`Such electric double layer capacitor is completed after 2 ~ 6 unit cells, each comprising two electrodes (polarized electrodes) of
`anode and cathode into which electrolyte in liquid state or solid state is impregnated, a separator made of a porous material which
`enables only ionic conduction between the two electrode and promotes insulation and short circuit prevention, a gasket which
`prevents leakage of an electrolyte and promotes insulation and short circuit prevention, and metal cases for anode and cathode
`which package them are laminated in series and then two terminals for anode and cathode are combined.
`While the unit cell of the electric double layer capacitor has various shapes, as shown in Fig. 1, the anode and cathode polarized
`electrodes (5) (5’) are fixed and completed to inner faces of the anode and cathode metal cases (4) (4’) having disc-shaped plates
`(2) (2’) and cylindrical side walls (3) (3’) formed by being extended therefrom, that is, inner faces of the plates (2) (2’), a
`separator (6) is interposed between the two electrodes (5) (5’) for ionic conduction and insulation, and a gasket (7) is provided for
`insulation and short circuit prevention between the anode and cathode components and for preventing leakage of an electrolyte
`impregnated into the electrodes (5) (5’) and pressurization is carried out as the above components are built in to form a coin-
`shaped unit cell (1). After 2 to 6 such unit cells (1) are laminated and anode and cathode terminals are fastened, coating is carried
`out with an insulating cladding to complete the coin-type electric double layer capacitor.
`After the polarized electrodes (5) (5’) are coupled inside the metal cases (4) (4’) as in the above, electrical energy delivered
`outside of the unit cell (1) to the metal cases (4) (4’) is delivered to the polarized electrodes (5) (5’). Accordingly, electrical
`conductivity must be excellent between the two components and they must be completely coupled. If complete coupling is not
`achieved, such electrical performance as electrostatic capacity, internal resistance and leakage current tends to deteriorate.
`Furthermore, the center of the metal cases (4) (4’) must coincide with the center of the polarized electrodes (5) (5’). If the centers
`do not coincide with each other, electrical performance of the electric double layer capacitor deteriorates.
`In the past in configuring the all (1) of such coin-type electric double layer capacitor, the polarized electrodes (5) (5’) that were
`coupled to the metal cases (4) (4’) were prepared with a powder activated carbon material on a sheet of solid state, prepared by
`fixing powder activated carbon slurry on a metal current collector or prepared as an activated carbon sheet of fibers, and fixing
`and coupling was carried out by such method that an adhesive or welding was used inside the metal cases (4) (4’).
`For example, as shown in Fig. 2a, an active electrode material prepared by mixing powder activated carbon, binder and
`conductive additive was prepared on a sheet of a solid state, the polarized electrode (5) (5’) which was cut from the sheet into a
`disc shape, and a liquid conductive adhesive (8) such as carbon paste or conductive polymer was applied inside the metal case,
`that is, inside the plate (2) (2’) before adhesion under pressure was carried out for fixing and coupling. However, such coupling
`method in which an adhesive (8) is used has the shortcoming of low productivity and complicated processes due to addition of a
`drying process. In particular, the problem of coupling failure occurred in which the adhered polarized electrode (5) (5’) was
`easily separated from the metal case (4) (4’) by quenching following high temperature drying or external shock. In addition, as
`the outer diameter of the polarized electrode (5) (5’) is generally formed to be smaller than the inner diameter of the metal case (4)
`(4’), the phenomenon in which the polarized electrode (5) (5’) drifts to one direction by surface tension of the adhesive (8), that is,
`the phenomenon of eccentricity is likely to take place so that the center of the metal case (4) (4’) does not coincide with the
`polarized electrode (5) (5’), which results in the problem of deteriorating electrical performance.
`In addition, to describe another configuration of the prior art referring to Fig. 2b, in configuring the polarized electrode (5) (5’),
`powder activated carbon slurry (5b) was coated on a metal current collector (5a) in the form of aluminum foil and then drying
`and rolling pressurization processes were performed to prepare the polarized electrode (5) (5’), or the metal (5a) such as
`aluminum (Al), nickel (Ni) or titanium (Ti) was plasma-sprayed on the surface of the fiber activated carbon sheet (5b) for
`preparation. In Fig. 2b the metal current collector and metal which were welded and coupled to the metal case (4) (4’) were
`identically indicated with the reference numeral 5a, and the powder activated carbon slurry and fiber activated carbon sheet fixed
`on their surfaces were indicated with the reference numeral 5b. In the past the polarized electrode (5) (5’) thus prepared was cut
`into a disc shape and coupled to the metal case (4) (4’) by spot welding using the (+) welding terminal (9a) and (-) welding
`terminal (9b). However, because the spot welding is based on the mode in which resistance heat generated by applying
`mechanical pressure and current is used to fuse a pressurized area, it has such problems that the electrode (5) (5’) is easily
`damaged by resulting shock and its electrical performance is deteriorated. That is, because spot welding, as shown in Fig. 1b,
`requires the welding terminals to be grounded to the metal case (4) (4’) and polarized electrode (5) (5’), the electrode (5) (5’) is
`changed by shock from the welding terminal (9a) grounded to the polarized electrode (5) (5’).
`Moreover, the polarized electrode (5) (5’) of the fiber activated carbon sheet also has problems in that its material is expensive
`and that the method of spraying a metal for adhesion requires addition of a process for spraying a metallic material, which results
`in a complicated overall process. Expensive equipment required for spraying a metallic material also presents a problem.
`In addition, when 2 ~ 6 of the coin-type unit cells (1) configured as above were laminated to carry out coupling in-between the
`
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`JLab/Cambridge, Exh. 1008, p. 5
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`unit cells (1) in the past, a welding terminal (9a) (9b) was ground to each of the anode metal case (4) and cathode metal case (4’)
`and spot welding was carried out for coupling, which resulted in the problems with damages on the polarized electrode (5) (5’)
`and processes.
`Technical Objective of the Invention
`
`Laid-open Patent Tuk2003-0087316
`
`
`The present invention was conceived to solve the problems described above, and the objective of the present invention is to
`provide the coin-type electric double layer capacitor having excellent coupling capability and electrical performance in which
`such problems resulting from using a conventional adhesive or the coupling method of spot welding are solved and components
`comprising a unit cell and a unit cell are sturdily coupled by coinciding their centers, and its manufacturing method.
`
`In particular, the present invention is intended to provide the coin-type electric double layer capacitor having excellent electrical
`performance by sturdily coupling a polarized electrode to a metal current collector so that the electrode may not be damaged or
`result in the phenomenon of eccentricity and its manufacturing method.
`
`The objective of the present invention above is to provide the coin-type electric double layer capacitor wherein a unit cell
`comprises anode and cathode metal cases having a disc-shaped plate and a cylindrical side wall extended and formed therefrom;
`anode and cathode polarized electrodes which are fixed and coupled inside the metal case, a separator which is laminated in-
`between the polarized electrodes for ionic conduction and insulation, and a gasket which is built in to provide insulation, prevent
`short circuit, and prevent leakage of an electrolyte which is impregnated into the electrodes, and 2 ~ 6 of the unit cells are
`laminated to couple terminals and coated with an insulating cladding.
`
`And the objective is achieved to configure the unit cell by laser welding the metal case and polarized electrode under the
`condition that their centers coincide with each other and then to carry out laser welding after interposing a fixing member in-
`between the unit cells.
`
`
`Configuration and Action of the Invention
`
`
`In the following the present invention is described in detail referring to the drawings attached.
`
`Fig. 3 is a cross-sectional diagram of the coin-type electric double layer capacitor according to the present invention, Fig. 4 is a
`cross-sectional diagram showing a preferred example of the polarized electrode applied to the present invention, and Fig. 5a to
`Fig. 5c are cross-sectional diagrams of configuration intended to describe the manufacturing method of the coin-type electric
`double layer capacitor according to the present invention.
`
`As shown in Fig. 3, the present invention provides a coin-type electric double layer capacitor wherein polarized electrodes (10)
`(10’) are welded by laser to the inner surface of metal cases (20) (20’) having disc-shaped plates (21) (21’) and cylindrical side
`walls (22) (22’) formed by extending therefrom under the condition in which their center are made to coincide to configure a unit
`cell (50), 2 to 6 of the unit cells (50) are laminated and coupled but a fixing member (60) having a disc-shaped substrate (61) and
`a cylindrical coupling part (62) formed by extending therefrom is interposed in-between the unit cells (50), and the metal case (20)
`(20’) and the fixing member (60) are welded by laser and coupled, and its manufacturing method.
`
`In addition, an anode terminal (70) and a cathode terminal (70’) are respectively welded by laser to the anode metal case (20) of
`the top unit cell (50) and the cathode metal case (20’) of the bottom unit cell (50), and an insulating cladding (80) is coated in the
`outer circumference of such two unit cells (50).
`
`Furthermore, in the unit cell (50) are built in a separator (30) made with a porous material which enables ionic conduction of the
`anode polarized electrode (10) and cathode polarized electrode (10’) only and affords insulation and short circuit prevention and
`a gasket (40) made with a plastic material which affords insulation and short circuit prevention of the anode component (10) (20)
`and the cathode component (10’) (20’) and prevents leakage of an electrolyte which is impregnated into the polarized electrodes
`(10) (10’).
`
`Fig. 3 show the coin-type electric double layer capacitor formed by lamination of two unit cells (50), but three or more and a
`plurality of unit cells (50) may be laminated for the configuration according to the present invention.
`
`Therefore, the present invention has such characteristics wherein the metal cases (20) (20’) and the polarized electrode (10) (10’)
`are welded by laser under the condition in which their centers coincide with each other to configure a unit cell (50), a structure
`further comprising a fixing member (60) is used and the unit cell (60) and the fixing member (60) are welded by laser to carry out
`coupling in-between such unit cells (50), and terminals (70) (70’) are welded by laser on the top and bottom of the unit cell (50)
`and coupled so that components comprising the capacitor may be physically, and electrically coupled with stability.
`
`The polarized electrode (10) (10’) was prepared by coating and then fixing powder activated carbon slurry (14) (14’) on the metal
`current collector (12) (12’) in a foil form. That is, the powder activated carbon slurry (14) (14’) which is prepared by mixing
`binder and conductive additive with powder activated carbon is coated on a metal current collector (12) (12’) using a roll coater
`or knife coater and then dried before a heated roll is used to perform a pressurization process and then impregnation in an
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`Laid-open Patent Tuk2003-0087316
`
`electrolyte solution is carried out to prepare the polarized electrode (10) (10’). At this time, an etching foil furnished with a
`number of recessed parts (12a) which are formed by etching or pitting the surface on which powder activated carbon slurry (14)
`(14’) is fixed is preferably used for the metal current collector (12) (12’) comprising the polarized electrode (10) (10’) as shown
`in Fig 4. Such etching foil increases the contact surface area between the powder activated carbon slurry (14) (14’) and the metal
`current collector (12) (12’) due to its recessed parts (12a) to improve on the electrical conductivity between the components and
`couple the two components more sturdily if a rolling pressurization process is performed. Furthermore, since the active electrode
`material of the powder activated carbon slurry is filled more per unit volume of the polarized electrode (10) (10’), the unit cell
`(50) may become slim while the same electrostatic capacity is afforded.
`
`It is preferred that the fixing member (60) is formed with the same material as that of the metal case (20) (20’) which is coupled
`thereto by laser welding and then coupled. As a result, metal to metal contact of the same material takes place so that electrical
`conductivity becomes excellent and the coupling capability of laser welding also becomes superior. For the materials of such
`fixing member and metal case (20) (20’) SUS alloy, Al, Ni, Ta or Ti metals may be used. In addition, when the fixing member
`(60) is formed, the inner diameter of its cylindrical coupling part (62) is made to be identical to the outer diameter of the
`cylindrical side wall (22’) in of the cathode metal case (20’). Accordingly, the coupling part (62) and side wall (22’) are closely
`pressed to each other so that coupling capability and contact area increases and that a unit cell (50) to be inserted inside the fixing
`member (60) naturally becomes the center of the fixing member (60).
`
`It is also preferred to use the metal current collector (12) (12’) whose material is the same as that of the metal case (20) (20’).
`This also achieves contact by the same material so that excellent electrical performance and coupling capability may be promoted.
`
`In general, aluminum is used a lot for the material of the metal current collector (12) (12’) and the SUS alloys including SUS304
`and SUS316 are used a lot for the material of the metal case (20) (20’). If aluminum is used for the material of the metal current
`collector (12) (12’) and SUS alloy is used for the metal case (20) (20’), the inner face of the metal case (20) (20’) may be coated
`with aluminum and used, which prevents formation of the spontaneous electric potential difference of the metal to enable
`enhancement of coupling capability during welding between the metal case (20) (20’) and the metal current collector (12) (12’).
`
`The course of manufacturing for the present invention as in the above is described as follows referring to Fig. 5a to Fig. 5c.
`
`As shown in Fig. 5a, an anode polarized electrode (10) is located on the inner face of an anode metal case (20) so that their
`centers coincide with each other, and then a laser beam is injected from outside the metal case (20). Accordingly, a plate (21)
`inner face of the metal case (20) is coupled with the metal current collector (12) of the polarized electrode (10) to complete an
`anode component (10) (20). In addition, a cathode polarized electrode (10’) is coupled with the cathode metal case (20’)
`identically as in the above to complete a cathode component (10’) (20’). Since such laser welding does not generate electric
`shock unlike the conventional spot welding and has a narrow range of thermal effect, the polarized electrode allows sturdy
`coupling of the metal case (20) (20’) with the polarized electrode (10) (10’) without damaging the polarized electrode (10) (10’).
`
`Subsequently, as shown in Fig. 5b, a separator (30) is interposed between the anode polarized electrode (10) and the cathode
`polarized electrode (10’) and an electrolyte is impregnated into the polarized electrodes (10) (10’). Further, a gasket (40) is
`placed into the inner circumference of the cathode metal case (20’) and then curling is carried out to have centers of the anode
`and cathode metal cases (20) (20’) coincide with each other to configure a unit cell (50) with the built-in gasket (40).
`
`On the top of the unit cell (50) configured as above, that is, on the outer face of the anode metal case (20), as shown in Fig. 5b, is
`located a fixing member (60) and then a laser beam (R) is injected onto a substrate (61) from an inner side of the fixing member
`(60). At this time the center of the fixing member (60) is made to coincide with the center of the unit cell (50).
`
`Further, as shown in Fig. 5c, another unit cell (50) is inserted into the fixing member (60) and then a laser beam (R) is injected
`from outside the coupling part (62) of the fixing member (60) to weld a side wall (22’) of the cathode metal case (20’) with the
`coupling part (62). Since the inner diameter of the coupling part (62) is identical to the outer diameter of the side wall (22’) at this
`time as described previously, their centers coincide with each other naturally by insertion and fitting so that coupling takes place.
`
`While the number of welding points made by laser welding in each of the above steps may have a multiple number depending
`upon the diameter of a unit cell (50), it was shown by experimental consideration of the present inventors that excellent coupling
`capability was available even with 2 welding points in case of the unit cell (50) of 8 ~ 15 mm in diameter.
`
`Subsequently, as shown in Fig. 5c, an anode terminal (70) and a cathode terminal (70’) are respectively welded to the anode
`metal case (20) of a top unit cell (50) and the cathode metal case (20’) of a bottom unit cell (50). In addition, when an insulating
`cladding (80) is covered on outer circumference of the top and bottom unit cells (50), as shown in Fig. 3, a coin-type electric
`double layer capacitor is completed in which two unit cells (50) are laminated.
`
`Effects of the Invention
`
`
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`JLab/Cambridge, Exh. 1008, p. 7
`JLab/Cambridge v. Varta, 2020-01212
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`

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`
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`Laid-open Patent Tuk2003-0087316
`
`Therefore, the present invention provides the coin-type electric double layer capacitor wherein components configuring a unit
`cell (50) and a unit cell (50) are welded by laser to afford study coupling without any eccentricity phenomenon or complicated
`processes, particularly excellent electrical performance without any damages on the polarized electrode (10) (10’) unlike
`conventional spot welding, and stable coupling physically and electrically.
`
`In addition, in the present invention the metal current collector (12) (12’) comprising the polarized electrode (10) (10’), metal
`case (20) (20’) and fixing member (60) are made with the same material and then welded by laser, and an etching foil is used for
`the metal current collector (12) (12’) so that it exhibits excellent coupling capability and electrical performance.
`
`
`
`(57) Claims
`
`Claim 1.
`A coin-type electric double layer capacitor in which 2 ~ 6 unit cells (50) each comprising anode and cathode metal cases (20)
`(20’) having disc-shaped plates (21) (21’) and cylindrical side walls (22) (22’) formed by extending therefrom, anode and
`cathode polarized electrodes (10) (10’) which are fixed inside the metal cases (20) (20’) and coupled and formed by fixing
`powder activated carbon slurry (14) (14’) on metal current collectors (12) (12’), a separator (30) laminate in-between the
`polarized electrodes (10) (10’), and a gasket (40) are laminated to couple with terminals (70) (70’) and then covered with an
`insulating cladding (80), wherein
`
`the unit cell (50) is welded by laser under the condition that centers of the metal cases (20) (20’) and polarized electrodes (10)
`(10’) coincide with each other, a fixing member (60) having a disc-shaped substrate (61) and a cylindrical coupling part (62)
`formed by extending therefrom is interposed in-between the unit cells (50) under the condition that center of the metal cases (20)
`(20’) and fixing member (60) coincide with each other and then terminals (70) (70’) are welded by laser to top and bottom unit
`cells (50) and coupled.
`
`Claim 2.
`The coin-type electric double layer capacitor recited in Claim 1, wherein the metal current collector (12) (12’) is an etching foil in
`which a number of recessed parts (12a) are furnished on the face fixed with powder activated carbon slurry (14) (14’).
`
`Claim 3.
`The coin-type electric double layer capacitor recited in Claim 1 or Claim 2, wherein the metal current collector (12) (12’), metal
`case (20) (20’) and fixing member (60) are made of the same material.
`
`Claim 4.
`A method of manufacturing a coin-type electric double layer capacitor in which 2 ~ 3 unit cells (50), each comprising anode and
`cathode metal cases (20) (20’) having disc-shaped plates (21) (21’) and cylindrical side walls (22) (22’) formed by extending
`therefrom, anode and cathode polarized electrodes (10) (10’) which are fixed inside the metal cases (20) (20’) and coupled and
`formed by fixing powder activated carbon slurry (14) (14’) on metal current collectors (12) (12’), a separator (30) laminate in-
`between the polarized electrodes (10) (10’), and a gasket (40) are laminated, comprising
`
` a
`
` step in which centers of the metal case (20) (20’) and polarized electrodes (10) (10’) are made to coincide with each other, and
`a laser beam (R) is injected from outside the metal case (20) (20’) to couple the metal case (20) (20’) with the polarized electrode
`(10) (10’).
`
`a step in which the separator (30) is interposed in-between the polarized electrodes (10) (10’), and an electrolyte is impregnated
`into the polarized electrodes (10) (10’), the gasket (40) is built in on inner circumference of the cathode metal case (20), and
`curling is carried out under the condition that centers of the anode component (10) (20) and cathode component (10’) (20’)
`coincide with each other to configure a unit cell (50),
`
`a step in which a fixing member (60) is located on the top face of the unit cell (50) so that the centers coincide with each other,
`and a laser beam (R) is injected onto a substrate (61) from the inner side of the fixing member (60) to couple the unit cell (50)
`with the fixing member (60),
`
`a step in which another unit cell (50) is inserted inside the fixing member (60) and a laser beam (R) is injected outside the
`coupling part (62) of the fixing member (60) to couple the unit cell (50) with the fixing member (60), and
`
`a step in which terminals (70) (70’) are welded by laser to the top and bottom unit cells (50) for coupling.
`
`
`
`Drawings
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`JLab/Cambridge, Exh. 1008, p. 8
`JLab/Cambridge v. Varta, 2020-01212
`
`

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`Laid-open Patent Tuk2003-0087316
`
`Fig. 1
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`Fig. 2a
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`Fig. 2b
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`JLab/Cambridge, Exh. 1008, p. 9
`JLab/Cambridge v. Varta, 2020-01212
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`Laid-open Patent Tuk2003-0087316
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`Fig. 3
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`Fig. 4
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`Fig. 5a
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`JLab/Cambridge, Exh. 1008, p. 10
`JLab/Cambridge v. Varta, 2020-01212
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`Laid-open Patent Tuk2003-0087316
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`Fig. 5b
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`Fig. 5c
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`JLab/Cambridge, Exh. 1008, p. 11
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`JLab/Cambridge, Exh. 1008, p. 12
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`(51) 。Int. Cl.7
`H01G 9/155
`(21) 출원번호
`(22) 출원일자
`(71) 출원인
`
`(72) 발명자
`
`공개특허 특2003-0087316
`
`((19)대한민국특허청(KR)
`(12) 공개특허공보(A)
`(11) 공개번호
`(43) 공개일자
`
`특2003-0087316
`2003년11월14일
`
`10-2002-0025330
`2002년05월08일
`(주)카마텍
`경기도 수원시 팔달구 인계동 1017 경기벤처빌딩 10층
`(주)에프텍
`경기도 화성군 정남면 용수리 58-63
`
`권경태
`경기도 화성시 매송면 원평리 91-16번지 금강빌라 A동 101호
`
`윤철훈
`경기도 용인시 이동면 천리 동아아파트 1212호
`
`이용욱
`경기도 이천시 백사면 조읍리 627-1 한솔임대아파트 102동 1411호
`
`허진우
`경상남도 통영시 서호동 77번지
`
`노광철
`서울특별시 은평구 갈현2동 228-11번지
`
`정세일
`서울특별시 송파구 거여동 현대3차아파트 302동 1103호
`
`윤항식
`
`(74) 대리인
`심사청구 : 있음
`(54) 코인형 전기이중층 커패시터 및 그 제조방법
`
`요약
`본 발명은 코인형 전기이중층 커패시터 및 그 제조방법에 관한 것으로, 특히 단위셀의 구성요소 및 단위셀 간을 견고
`하게 결합시킨 코인형 전기이중층 커패시터 및 그 제조방법에 관한 것이다. 본 발명은 플레이트(21)(21')와 이로부터
`연장된 측벽(22)(22')을 갖는 금속 케이스(20)(20')와, 상기 금속 케이스(20)(20')에 내부에 고정 결합되는 분극성 전
`극(10)(10')과, 상기 분극성 전극(10)(10') 사이에 적층된 세퍼레이터(30)와, 가스킷(40)으로 구성한 단위셀(50)을 2
`~6개 적층하여 이루어지는 코인형 전기이중층 커패시터에 있어서, 상기 단위셀(50)의 금속 케이스(20)(20')와 분극
`성 전극(10)(10')이 중심이 일치된 상태에서 레이저 용접되고, 단위셀(50)의 사이에는 원반 형상의 기판(61)과 이로
`부터 연장되어 형성된 원통형의 결합부(62)를 가지는 고정부재(60)가 개재되어 금속 케이스(20)(22')와 고정부재(60
`)를 중심이 일치시킨 상태에서 레이저 용접되어 결합된 코인형 전기이중층 커패시터 및 그 제조방법을 제공한다. 이
`에 따라, 본 발명은 편심 현상이나 공정의 복잡함이 없이 물리적으로 그리고 전기적으로 안정되게 결합되어 우수한
`결합력을 가지며, 특히 분극성 전극의 손상이 없어 우수한 전기적 성능을 발휘한다.
`
`대표도
`
`- 1 -
`
`JLab/Cambridge, Exh. 1008, p. 13
`JLab/Cambridge v. Varta, 2020-01212
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`

`

`공개특허 특2003-0087316
`
`도 3
`
`색인어
`코인, 전기이중층, 커패시터, 단위셀, 전극, 레이저, 용접
`
`명세서
`
`도면의 간단한 설명
`도 1은 종래의 코인형 전기이중층 커패시터의 단위셀을 보인 일부 절개 단면 사시도.
`도 2a는 종래 기술의 코인형 전기이중층 커패시터의 단위셀의 구성 과정을 보인 사시도.
`도 2b는 종래 기술의 다른 전기이중층 커패시터의 단위셀의 구성 과정을 보인 단면도.
`도 3은 본 발명에 따른 코인형 전기이중층 커패시터의 단면도.
`도 4는 본 발명에 적용되는 분극성 전극의 바람직한 실시 예를 보인 단면도.
`도 5a 내지 도 5c는 본 발명에 따른 코인형 전기이중층 커패시터의 제조방법을 설명하기 위한 구성 단면도.
`* 도면의 주요부분에 대한 부호의 설명 *
`10,10': 분극성 전극 12,12': 금속 집전체
`12a: 요홈부 14,14': 분말 활성탄 슬러리
`20,20': 금속 케이스 21,21': 플레이트
`22,22': 측벽 30: 세퍼레이터
`40: 가스킷 50: 단위셀
`60: 고정부재 61: 기판
`62: 결합부 70,70': 단자
`80: 피복재 R: 레이저 빔
`
`발명의 상세한 설명
`
`발명의 목적
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`발명이 속하는 기술 및 그 분야의 종래기술
`본 발명은 코인형 전기이중층 커패시터 및 그 제조방법에 관한 것으로, 보다 상세하게는 금속 케이스와 분극성 전극
`을 중심이 일치시킨 상태에서 레이저 용접하여 단위셀을 구성하고, 이러한 단위셀 사이에 고정부재를 개재하여 레이
`저 용접함으로써 전기적 성능이 우수하고, 물리적으로 그리고 전기적으로 안정되게 결합된 코인형 전기이중층 커패
`시터 및 그 제조방법에 관한 것이다.
`최근에 전자기기, 가전제품 및 산업기기 등의 발전과 더불어 전자부품이 고급화, 소형화 및 경량화되고 있으며 이에
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`- 2 -
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`JLab/Cambridge, Exh. 1008, p. 14
`JLab/Cambridge v. Varta, 2020-01212
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`

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`공개특허 특2003-0087316
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`따라 전자부품의 다양화에 따른 부품의 다기능화도 요구되고 있다. 그 한가지의 예로써 2차 전지와 커패시터의 기능
`을 합친 것으로 서로 다른 계면에 형성된 전기이중층에서 발생하는 정전하 현상을 이용한 전기이중층 커패시터(Elect
`ric Double Layer Capacitor)의 사용이 날로 증가하고 있다.
`전기이중층 커패시터는 전지와는 달리 화학반응을 수반하지 않기 때문에, 충전 및 방전 동작의 반복으로 인한 열화가
`매우 작다. 따라서, 전기이중층 커패시 터는 보수가 필요 없는 소자로서 주로 기억소자용 백업 전원 등으로 광범위하
`게 사