WO2012132719A1 - 二次電池 - Google Patents
二次電池 Download PDFInfo
- Publication number
- WO2012132719A1 WO2012132719A1 PCT/JP2012/054995 JP2012054995W WO2012132719A1 WO 2012132719 A1 WO2012132719 A1 WO 2012132719A1 JP 2012054995 W JP2012054995 W JP 2012054995W WO 2012132719 A1 WO2012132719 A1 WO 2012132719A1
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- WIPO (PCT)
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- electrode
- current
- current interrupting
- secondary battery
- negative electrode
- Prior art date
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a secondary battery in which an electrode stack having a positive electrode and a negative electrode stacked via a separator is accommodated in an outer package.
- a laminated secondary battery in which an electrode laminate that is laminated with a separator disposed between a positive electrode and a negative electrode is housed in an outer package.
- this type of secondary battery from the viewpoint of battery safety, it is necessary to have a structure that quickly cuts off the current when the external terminals are short-circuited and when overcharged when the battery is charged beyond full charge. It is said that.
- Patent Document 1 Concerning the configuration for cutting off current when overcharged, it has a flat plate-like internal terminal provided inside the exterior body, and a flat plate-like external terminal provided with one end protruding from the inside of the exterior body.
- Patent Document 1 A configuration in which one end of the external terminal is joined to the other end of the external terminal is disclosed in Patent Document 1. In this configuration, when the internal pressure of the exterior body rises due to the gas generated during overcharge, the junction between the internal terminal and the external terminal peels off, thereby interrupting the current.
- Patent Document 2 discloses a configuration in which a fuse structure is provided at an external terminal. In this configuration, the fuse structure is blown by an overcurrent that flows when an external short circuit occurs, thereby interrupting the current.
- the current interruption structure described in Patent Document 2 described above can cope with an overcurrent caused by an external short circuit.
- the current interrupting structure described in Patent Document 2 is a structure in which a large current does not flow during overcharging, so that the fuse structure is not blown and the current cannot be interrupted.
- an object of the present invention is to provide a secondary battery that can solve the problems of the related techniques.
- An example of the object of the present invention is to provide a secondary battery that can enhance the safety of the battery both during external short-circuiting and during overcharging by a single current interrupting element.
- a secondary battery according to the present invention includes an electrode laminate having a positive electrode and a negative electrode laminated via a separator, an exterior body that accommodates the electrode laminate, and one end that is a positive electrode or a negative electrode.
- An electrode terminal having the other end extended to the outside of the exterior body, and a current interrupting unit having a current interrupting element disposed on a current path between the positive electrode or the negative electrode and the electrode terminal; .
- the current interrupting element is connected to the opposing inner surface of the exterior body and breaks when the exterior body expands, and the fusing that is formed across the set of fractured parts and melts when overcurrent flows
- One of the set of broken portions is electrically connected to the electrode terminal, and the other of the set of broken portions is electrically connected to the positive electrode or the negative electrode.
- the single current interrupting element can improve the safety of the battery both at the time of external short circuit and at the time of overcharge.
- FIG. 1 is a perspective plan view showing a stacked secondary battery according to a first embodiment.
- FIG. 2 is a cross-sectional view showing the current interrupting portion of the multilayer secondary battery of the first embodiment along the line AA in FIG. It is a top view which shows the electric current interruption element with which the multilayer secondary battery of 1st Embodiment is provided. It is a figure for demonstrating the manufacturing process of the electric current interruption part in 1st Embodiment. It is a figure for demonstrating the manufacturing process of the electric current interruption part in 1st Embodiment. It is a figure for demonstrating the manufacturing process of the electric current interruption part in 1st Embodiment. It is a figure for demonstrating the manufacturing process of the electric current interruption part in 1st Embodiment. It is a figure for demonstrating the manufacturing process of the electric current interruption part in 1st Embodiment. It is a figure for demonstrating the manufacturing process of the electric current interruption part in 1st Embodiment.
- FIG. 6 is a perspective plan view showing a stacked secondary battery according to a second embodiment. It is a top view which shows the structural example of the electric current interruption element in embodiment. It is a top view which shows the structural example of the electric current interruption element in embodiment. It is a top view which shows the structural example of the electric current interruption element in embodiment. It is a top view which shows the structural example of the electric current interruption element in embodiment. It is a top view which shows the structural example of the electric current interruption element in embodiment.
- FIG. 1 is a perspective plan view of the multilayer secondary battery according to the first embodiment.
- FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 of the current interrupting part of the multilayer secondary battery of the first embodiment.
- the laminated secondary battery 1 of the first embodiment is configured as a lithium ion secondary battery, and a sheet-like positive electrode 3 and a sheet-like negative electrode 4 are separated from each other (not shown). ) Through the electrode stacks 6 alternately stacked.
- the positive electrode 3 has a positive electrode active material formed on at least one surface of the positive electrode current collector foil 12, and the negative electrode 4 has a negative electrode active material formed on at least one surface of the negative electrode current collector foil 13.
- the portion where the positive electrode active material is formed on at least one surface of the positive electrode current collector foil is simply referred to as the positive electrode, and the negative electrode active material is present on at least one surface of the negative electrode current collector foil.
- the formed part is simply called a negative electrode.
- the positive electrode current collector foil and the negative electrode current collector foil have portions where no active material is formed on both surfaces, and a parallel structure is formed by connecting these portions with the same polarity by ultrasonic welding or the like. ing.
- the portions where the active material is not formed on both sides of the positive electrode current collector foil are collectively referred to as the positive electrode current collector foil, and the portions where the negative electrode active material is not formed on both surfaces of the negative electrode current collector foil are collectively referred to. It is simply called a negative electrode current collector foil.
- the stacked secondary battery 1 includes a package 7 that covers the electrode stack 6, one set electrically connected to each of the positive electrode 3 and the negative electrode 4, and the other end extended to the outside of the package 7.
- a positive electrode current collector foil 12 is disposed on the outer edge of the positive electrode 3, and one end of a positive electrode tab 8 is joined to the positive electrode current collector foil 12.
- the negative electrode current collector foil 13 is disposed on the outer edge of the negative electrode 4, and the current interrupting unit 10 extends across the negative electrode current collector foil 13 and the negative electrode tab 9. Is provided.
- the exterior body 7 has a pair of exterior portions 7 b that are opposed to each other with the electrode laminated body 6 accommodated therein.
- the set of exterior portions 7b is made of film-like aluminum, and is formed into a bag shape by forming a welded portion 7a that is welded over the outer periphery thereof.
- the current interrupting unit 10 includes a current interrupting element 11 and a strip-shaped first conductor having one end joined to the negative electrode current collector foil 14 and the other end joined to the current interrupting element 11. 14 and a strip-shaped second conductor 15 having one end joined to the current interrupting element 11 and the other end joined to the negative electrode tab 9.
- FIG. 3 is a plan view of the current interrupting element 11 provided in the multilayer secondary battery 1 of the first embodiment.
- the electric current interruption element 11 is formed in metal foil shape with metal materials, such as aluminum.
- the current interrupting element 11 is formed in a strip shape across a set of breakage portions 16 and a set of breakage portions 15 respectively connected to a set of exterior portions 7 b of the exterior body 7.
- Two fusing parts 17 are provided.
- one of the set of breakage portions 16 is electrically connected to the negative electrode tab 9, and the other of the set of breakage portions 16 is electrically connected to the negative electrode 4.
- the fracture portion 16 is formed in a quadrangular shape and has two cuts 16a extending linearly from two corners adjacent to the fusing portion 17 toward the center.
- the fracture portion 16 mechanically breaks along the cut 16a by moving in a direction in which the pair of exterior portions 7b are separated.
- the ends of the fracture portion 16 are joined to the first and second conductors 14 and 15 using, for example, ultrasonic welding or laser welding.
- the fusing part 17 is integrally formed across the set of fractured parts 16 and has a predetermined width and cross-sectional area that is fused at a desired temperature.
- the fusing portion 17 is insulated by a heat insulating tape 18 as a heat insulating material that protects against heat generated when the ends of the fracture portion 16 are welded to the first and second conductors 14 and 15. Covered.
- the current interrupting element 11 has the fracture portion 16 that operates due to the expansion of the exterior body 7 during overcharging and the fusing portion 17 that operates due to overcurrent when the positive electrode 3 and the negative electrode 4 are short-circuited. is doing.
- the other end of the first conductor 14 is joined to the inner surface of one exterior portion 7 b via a joining plate 19.
- One end of the second conductor 15 is joined to the inner surface of the other exterior part 7 b via a joining plate 19.
- the joining plate 19 is formed larger than the outer shape of the current interrupting element 11 by polypropylene resin, and one surface in the thickness direction is welded to the inner surface of the exterior portion 7b. Further, the other surface of the bonding plate 19 in the thickness direction is welded to the end portions of the first and second conductors 14 and 15 where the rough surfaces are formed.
- the first and second conductors are joined to both ends of the current interrupting element.
- the first and second conductors 14 and 15 correspond to both ends of the current interrupting element 11.
- the portions may be integrally formed.
- the current interrupting unit 10 when the stacked secondary battery 1 is overcharged, gas is generated inside the outer package 7, and the outer package 7 expands. As the exterior body 7 expands, the exterior portion 7b moves in a direction in which the exterior body 7b separates, whereby a tension acts on the fracture portion 16 of the current interrupting element 11. Due to this tension, the pair of breaking portions 16 is quickly broken along the two cuts 16a. Thereby, the energization between the first conductor 14 and the second conductor 15 is interrupted.
- 4A to 4E are views for explaining a manufacturing process of the current interrupting unit 10 in the first embodiment.
- the heat insulating tape 18 is wound around the fusing part 17 of the current interrupting element 11. Subsequently, as shown in FIGS. 4A and 4B, the end portion of the one breaking portion 16 of the current interrupting element 11 is welded and joined to the end portion of the second conductor 15.
- the end portion of the other breakage portion 16 of the current interrupting element 11 is welded and joined to the end portion of the first conductor 14.
- the current interrupting element 11 is disposed between the end of the first conductor 14 and the end of the second conductor 15, and the first conductor 14 and the second conductor 15 and connected.
- the current interrupting part 10 is configured by joining a pair of joining plates 19 to the inner surface of the exterior part 7 b of the exterior body 7.
- the single current interrupt device 11 can be used when an external short circuit occurs. Battery safety during both overcharges can be increased.
- the current can be interrupted only by the single current interrupting element 11 both at the time of external short circuit and at the time of overcharge. For this reason, this embodiment simplifies the structure of the stacked secondary battery 1 and simplifies the manufacturing process, and increases the size of the secondary battery, as compared with a structure using a combination of two types of current interrupting elements. Can be avoided.
- FIG. 5 is a perspective plan view of the stacked secondary battery according to the second embodiment.
- the stacked secondary battery according to the second embodiment is different from the first embodiment in that the current interrupting portion is disposed on the current path between the positive electrode tab and the positive electrode.
- the configuration excluding the position of the current interrupting unit is the same as that in the first embodiment. Therefore, the same reference numerals as those in the first embodiment are used for the same constituent members as those in the first embodiment. The description is omitted.
- the stacked secondary battery 2 of the second embodiment includes a current interrupting unit 20 disposed on a current path between the positive electrode tab and the positive electrode.
- the configuration and operation of the current interrupting unit 20 are the same as those of the current interrupting unit 10 of the first embodiment.
- the external short circuit test and the overcharge test were respectively performed on the stacked secondary batteries 1 and 2 of the first and second embodiments described above.
- the first embodiment in which the current interrupting portion is disposed between the negative electrode and the negative electrode tab and the second embodiment in which the current interrupting portion is disposed between the positive electrode and the positive electrode tab.
- a comparison was made between the example and a comparative example without a current interrupting part.
- An external short circuit test and an overcharge test were performed in the following procedure.
- Table 1 shows the results of the first example, the second example, and the comparative example. As shown in Table 1, in the stacked secondary battery including the current interrupting element, the same effect can be obtained in both the first and second embodiments, compared with the comparative example regardless of the position of the current interrupting element. The battery safety has been improved.
- 6A to 6D are plan views of configuration examples of the current interrupting element in the embodiment.
- the electric current interruption element of another structural example is arrange
- positioned at the electric current interruption part 10 similarly to the above-mentioned electric current interruption element 11 only the difference in the shape of an electric current interruption element is demonstrated.
- the current interrupting element 21 has a set of breakage portions 26 and two fusing portions 27 integrally formed across the set of breakage portions 26.
- the fracture portion 26 is formed in a quadrangular shape and linearly extends from a corner between the two fusing portions 27 toward the corner on the end portion side joined to the first and second conductors 14 and 15. It has two cuts 26a extending.
- the current interruption element 21 differs from the above-described current interruption element 11 in the direction in which the cut 26a extends.
- the current interrupting element 31 has a set of breakage portions 36 and three fusing portions 37 that are integrally formed across the set of breakage portions 36.
- the fracture portion 36 is formed in a quadrangular shape, and has two cuts 36 a extending linearly from two corners adjacent to the fusing portion 37 toward the center.
- the three fusing parts 37 include a plurality of types of fusing parts having different widths. In the three fusing parts 37, the sum of the cross-sectional areas orthogonal to the length direction is equal to the sum of the cross-sectional areas of the two fusing parts 17, 27 of the current interrupting elements 11, 21 described above. As described above, the number of the fusing parts 37 may be appropriately increased or decreased as necessary.
- the current interrupting element 41 has a set of breakage portions 46 and two fusing portions 47 formed across the set of breakage portions 46.
- the fracture portion 46 has two cuts 46 a that continuously extend from the side edge of the band-shaped fusing portion 47.
- the cut 46a is formed such that an end portion on the center side of the break portion 46 is formed in an arc shape.
- the current interrupting element 51 has a set of breakage portions 56 and a single fusing portion 57 that is integrally formed across the set of breakage portions 56.
- the fracture portion 56 has two cuts 56 a that extend continuously from the side edge of the fusing portion 57 and extend linearly toward the center of the fracture portion 56.
- the fusing part 57 is formed in a substantially drum shape in which the width of the central part in the length direction is narrowed, and the fusing position is limited to the central part in the length direction.
- the current interrupting elements 21, 31, 41, 51 configured as described above can operate in the same manner as the current interrupting element 11 described above.
- the shape of the current interrupting element is not limited to the above-described configuration example, and the direction in which the cut extends, the length of the cut, and the shape of the fusing part are as required, such as the structure of the stacked secondary battery. It may be set appropriately.
- rupture part is not limited to the structure which has a cut
- the secondary battery of the embodiment exemplifies a configuration having an electrode laminated body in which a sheet-like positive electrode and a negative electrode are stacked via a separator, but is not limited to this configuration.
- it may be configured to have an electrode laminated body formed by winding a positive electrode and a negative electrode that are laminated via the electrode.
- the sheet-like positive electrode and the negative electrode are connected in parallel, but the present invention can also be applied when connected in series.
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Abstract
Description
図1に、第1の実施形態の積層型二次電池の透視平面図を示す。図2に、第1の実施形態の積層型二次電池の電流遮断部の、図1のA-A線に沿った断面図を示す。
図5に、第2の実施形態の積層型二次電池の透視平面図を示す。第2の実施形態の積層型二次電池は、電流遮断部が、正極タブと正極との電流の経路上に配置されている点が、第1の実施形態と異なっている。なお、第2の実施形態は、電流遮断部の位置を除く構成が第1の実施形態と同一であるので、第1の実施形態と同一の構成部材には第1の実施形態と同一の符号を付して説明を省略する。
(1)電池を満充電状態「DOD(Depth of discharge):0%」にする。
(2)電池の表面温度が「20℃±2℃」になるように温度を安定させる。
(3)電池を「合計0.1Ω未満」の外部抵抗を用いて外部短絡状態にして、1時間連続して短絡状態を継続させる。
(1)電池を放電状態「DOD:100%」にする。
(2)10V-1Cの条件で、充電を2.5時間連続して行う。
Claims (5)
- セパレータを介して積層された正極と負極とを有する電極積層体と、
前記電極積層体を収容する外装体と、
一端が前記正極または前記負極に電気的に接続され、他端が前記外装体の外部に延ばされた電極端子と、
前記正極または前記負極と、前記電極端子との間の電流の経路上に配置された電流遮断素子を有する電流遮断部と、を備え、
前記電流遮断素子は、前記外装体の対向する内面に連結され、前記外装体が膨張したときに破断する一組の破断部と、前記一組の破断部に跨って形成され、過電流が流れたときに溶断する溶断部とを有し、前記一組の破断部の一方が前記電極端子に電気的に接続され、前記一組の破断部の他方が前記正極または前記負極に電気的に接続されている、二次電池。 - 前記電流遮断部は、前記電流遮断素子の一端部と前記正極または前記負極とを連結する第1の導電体と、前記電流遮断素子の他端部と前記電極端子とを連結する第2の導電体と、を有している、請求項1に記載の二次電池。
- 前記電流遮断部は、前記溶断部を覆う断熱材を有している、請求項1または2に記載の二次電池。
- 前記破断部は、外縁部から延びる複数の切れ目を有している、請求項1ないし3のいずれか1項に記載の二次電池。
- 前記電極積層体は、前記セパレータを介して積層された前記正極と前記負極とを巻回してなる請求項1ないし4のいずれか1項に記載の二次電池。
Priority Applications (2)
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US14/001,438 US20130337300A1 (en) | 2011-03-30 | 2012-02-28 | Secondary battery |
CN201280012048.3A CN103415944B (zh) | 2011-03-30 | 2012-02-28 | 二次电池 |
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JP2011075545A JP5704645B2 (ja) | 2011-03-30 | 2011-03-30 | 二次電池 |
JP2011-075545 | 2011-03-30 |
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PCT/JP2012/054995 WO2012132719A1 (ja) | 2011-03-30 | 2012-02-28 | 二次電池 |
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JP (1) | JP5704645B2 (ja) |
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WO (1) | WO2012132719A1 (ja) |
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JP2018513524A (ja) * | 2015-04-22 | 2018-05-24 | エルジー・ケム・リミテッド | 安全性が向上した二次電池 |
JP2018521446A (ja) * | 2015-05-11 | 2018-08-02 | ゴゴロ インク | 可搬型多セル電気エネルギー貯蔵装置用電気コネクタ |
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KR102264635B1 (ko) * | 2017-11-23 | 2021-06-15 | 주식회사 엘지에너지솔루션 | 파우치 형 이차 전지 |
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CN105027326A (zh) * | 2013-09-26 | 2015-11-04 | 株式会社Lg化学 | 二次电池和应用于二次电池的电极引线组件 |
US20160028068A1 (en) * | 2013-09-26 | 2016-01-28 | Lg Chem, Ltd. | Secondary battery and electrode lead assembly applied thereto |
EP2950371A4 (en) * | 2013-09-26 | 2016-09-28 | Lg Chemical Ltd | SECONDARY BATTERY AND ELECTRODE CABLE ASSEMBLY FOR THIS |
US10026949B2 (en) | 2013-09-26 | 2018-07-17 | Lg Chem, Ltd. | Secondary battery and electrode lead assembly applied thereto |
JP2018513524A (ja) * | 2015-04-22 | 2018-05-24 | エルジー・ケム・リミテッド | 安全性が向上した二次電池 |
JP2020064881A (ja) * | 2015-04-22 | 2020-04-23 | エルジー・ケム・リミテッド | 安全性が向上した二次電池 |
JP7045599B2 (ja) | 2015-04-22 | 2022-04-01 | エルジー エナジー ソリューション リミテッド | 安全性が向上した二次電池 |
JP2018521446A (ja) * | 2015-05-11 | 2018-08-02 | ゴゴロ インク | 可搬型多セル電気エネルギー貯蔵装置用電気コネクタ |
US11165123B2 (en) | 2015-05-11 | 2021-11-02 | Gogoro Inc. | Electrical connector positioned in a battery pack |
Also Published As
Publication number | Publication date |
---|---|
US20130337300A1 (en) | 2013-12-19 |
JP2012209204A (ja) | 2012-10-25 |
CN103415944A (zh) | 2013-11-27 |
CN103415944B (zh) | 2016-05-11 |
JP5704645B2 (ja) | 2015-04-22 |
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