WO2023068876A1 - 캡 어셈블리 및 이를 포함하는 이차 전지 - Google Patents
캡 어셈블리 및 이를 포함하는 이차 전지 Download PDFInfo
- Publication number
- WO2023068876A1 WO2023068876A1 PCT/KR2022/016172 KR2022016172W WO2023068876A1 WO 2023068876 A1 WO2023068876 A1 WO 2023068876A1 KR 2022016172 W KR2022016172 W KR 2022016172W WO 2023068876 A1 WO2023068876 A1 WO 2023068876A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- safety vent
- cap assembly
- kgf
- cap
- secondary battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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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
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
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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
Definitions
- the present invention relates to a cap assembly and a secondary battery including the cap assembly. Specifically, the present invention relates to a cylindrical secondary battery capable of effectively absorbing external pressure due to a difference in physical properties between a safety vent and a current interrupting device.
- the secondary battery is classified into a cylindrical battery and a prismatic battery in which the battery assembly is embedded in a cylindrical or prismatic metal can, and a pouch-type battery in which the battery assembly is embedded in a pouch-type case made of an aluminum laminate sheet. .
- a cylindrical secondary battery generally has a structure in which a top cap is coupled to an upper portion of a battery can and a safety vent is provided at a lower portion of the top cap.
- a top cap is coupled to an upper portion of a battery can and a safety vent is provided at a lower portion of the top cap.
- the cylindrical secondary battery is equipped with a safety vent and a current interrupt device (CID) as a safety device.
- CID current interrupt device
- the cylindrical secondary battery In the stability test of the cylindrical secondary battery, after placing the cylindrical secondary battery between pressure plates, the cylindrical secondary battery is physically deformed by applying pressure. Since the stability test changes the overall shape of the cylindrical secondary battery, the cap assembly is also severely deformed.
- an object of the present invention is to provide a cap assembly in which a safety vent and a current interruption device are made of materials having different physical properties, and a secondary battery including the cap assembly.
- An exemplary embodiment of the present invention is a cap assembly having one side opened and coupled to an upper portion of a can accommodating a battery assembly therein, the cap assembly comprising: a top cap coupled to the upper portion of the can; a safety vent positioned below the top cap and coupled to an end of the top cap, and a current interruption element positioned below the safety vent and at least partially in contact with the safety vent, the current interruption element comprising:
- a cylindrical secondary battery including a material having a lower hardness than the safety vent is provided.
- the safety vent provides a cylindrical secondary battery including aluminum or an aluminum alloy.
- the safety vent provides a cylindrical secondary battery provided at an angle of 0° to 30° with the current interruption device.
- a cap assembly and a secondary battery including the cap assembly according to an exemplary embodiment of the present invention include a safety vent and a current cut-off device having different physical properties to effectively absorb external pressure and prevent deformation due to external pressure.
- FIG. 1 is a cross-sectional view showing a conventional cap assembly.
- FIG. 2 is a cross-sectional view of a cylindrical secondary battery according to an exemplary embodiment of the present invention.
- FIG 3 is a cross-sectional view of a cap assembly according to an exemplary embodiment of the present invention.
- the cylindrical secondary battery 100 may include a battery assembly 10, a can 20, and a cap assembly 30 (Cap Assembly).
- the battery assembly 10 is a power generating device capable of charging and discharging with a laminated structure of an anode/separator/cathode, and may include a jelly-roll structure in which a separator is interposed and wound between a long sheet-type cathode and anode coated with an active material. there is.
- a first insulating plate (not shown) and a second insulating plate (not shown) may be positioned above and below the battery assembly 10 , respectively.
- the first insulating plate may insulate between the battery assembly 10 and the cap assembly 30
- the second insulating plate may insulate between the battery assembly 10 and the lower portion of the can 20 .
- the battery assembly 10 may further include a center pin (not shown) at the center.
- the center pin may prevent the battery assembly 10 wound in a jelly-roll form from unwinding and may serve as a passage for gas inside the cylindrical secondary battery 100 .
- the can 20 may have a cylindrical structure with a space formed therein.
- a battery assembly 10 including an electrode and a separator and an electrolyte solution (not shown) may be accommodated in the inner space of the can 20 .
- One side of the can 20 may have an open structure, and the other side may have a sealed structure.
- one side and the other side of the can 20 mean the ends located at the top and bottom along the direction of gravity or the central axis of the can 20 .
- a beading portion 21 folded toward the center of the cylindrical secondary battery 100 may be provided on one side of the open can 20 .
- the can 20 may include a crimping unit 22 above the beading unit 21 . That is, the crimping part 22 may be located on the uppermost side of the can 20 .
- the can 20 may be made of a lightweight conductive metal material such as aluminum or aluminum alloy.
- FIG. 3 is a cross-sectional view showing a cap assembly 30 according to an exemplary embodiment of the present invention.
- the cap assembly 30 may be coupled to an upper portion of the can 20 and may include a top cap 31 , a safety vent 32 , and a current blocking device 33 .
- the top cap 31 protrudes from the top of the cap assembly 30 and may function as an electrode terminal to be electrically connected to the outside.
- the top cap 31 may be coupled to the top of the can 20 . That is, the top cap 31 may be combined with the crimping part 22 located at the top of the can 20 .
- a gasket 40 may be included between the crimping part 22 and the top cap 31 .
- the gasket 40 may increase the sealing force of the can 20 .
- the safety vent 32 may be located below the top cap 31 and coupled to an end of the top cap 31 .
- the safety vent 32 may be in contact with the end of the top gap 31 for a predetermined length, and a portion excluding the contact length may be spaced apart from the top cap 31 by a predetermined distance.
- the safety vent 32 may have an increased distance from the top cap 31 toward the center from an end portion contacting the top cap 31 .
- the end may mean a position corresponding to the position of the crimping part 22 or the gasket 40 .
- the safety vent 32 may have an end perpendicular to the axial direction of the can 20 . At this time. Like the safety vent 32 , the top cap 31 may be provided perpendicular to the axial direction of the can 20 . That is, the safety vent 32 and the top cap 31 may be positioned horizontally.
- the safety vent 32 may be provided in a form in which an end portion is bent to cover an outer circumferential surface of the top cap 32 .
- the safety vent 32 may be provided by being bent at least once. A recessed central portion 32a in which the center of the safety vent 32 is depressed, and an edge portion 32c coupled to an end portion of the top cap 31, that is, a region where the top cap 31 is coupled to the can 20 and a venting portion 32b connecting the indented central portion 32a and the rim portion 32c. Also, the safety vent 32 may include one or more notches 32d between the indented central portion 32a and the rim portion 32c.
- the safety vent 32 may be provided with two notches 32d at a portion not in contact with the top cap 31 . That is, the safety vent 32 may be bent by the notch 32d, and the center of the safety vent 32 may be depressed to form a recessed central portion 32a.
- the safety vent 32 may have a venting portion 32b connecting the rim portion 32c contacting the top cap 31 and the recessed central portion 32a.
- the notch 32d may be provided in a contact area between the bent portion 32b and the recessed central portion 32a and a contact area between the bent portion 32b and the edge portion 32c.
- the venting portion 32b of the safety vent 32 may be inclined, and the lower surface of the venting portion 32b has an angle of 0° to 30° with the upper or lower surface of the edge portion 32c of the safety vent 32 ( ⁇ ) may have a slope.
- the edge portion 32c of the safety vent 32 can be positioned in parallel with the CID filter 33b to be described later, the lower surface of the venting portion 32b is at an angle of 0° to 30° with the upper surface of the CID filter 33b. It may be provided at an angle of °.
- the venting portion 32b has an inclination of more than 30° with respect to the CID filter 33b, the recessed central portion 32a of the safety vent 32 moves toward the top cap 31 during the stability test of the cylindrical secondary battery 100. As it is deformed, a short circuit and shape deformation of the cap assembly 30 may occur.
- the current cut-off device 33 is located below the safety vent 32 and may come into contact with at least a portion of the safety vent 32 .
- the current blocking element 33 may include a central portion 33a protruding toward the safety vent 32 and a CID filter unit 33b positioned outside the central portion. Accordingly, in the cap assembly 30, the central portion 33a of the current interrupting element 33 and the recessed central portion 32a of the safety vent 32 may come into contact with each other.
- the CID gasket 50 may be provided at the end of the CID filter unit 33b.
- the CID gasket 50 can prevent the safety vent 32 from coming into contact with a portion other than the central portion 33a of the current blocking device 33 .
- the current blocking element 33 may include a material having a lower hardness than the safety vent 32 .
- the hardness of the current blocking element 33 is high, the deformation of the shape of the current blocking element 33 is minimized by a stability test or external pressure, so that it penetrates the CID gasket 50 and contacts the beading part 21, thereby increasing the possibility of ignition. there is a problem.
- the safety vent 32 may include a material having high hardness in order to reduce a shape deformation rate by an external pressure. That is, the safety vent 32 has a low shape deformation rate even under external pressure, and thus can reduce the overall deformation rate of the top cap 31 .
- the safety vent 32 according to the present invention is formed in a shape with a recessed center, when external pressure is applied to the cylindrical secondary battery 100, the recessed central portion of the safety vent 32 moves toward the current interruption device 33. can be transformed into
- the safety vent 32 applies pressure to the current cut-off element 33 by deformation of the shape.
- the current cut-off element 33 is made of a soft material and receives a large pressure from the safety vent 32. Therefore, The shape deformation rate of the current blocking element 33 may be increased.
- the safety vent 32 may include aluminum or an aluminum alloy. In one embodiment, when the safety vent 32 is an aluminum alloy, it may be an aluminum-manganese-based alloy. For example, the safety vent 32 may include 85% to 98% by weight of aluminum, 7% by weight or less of manganese, 5% by weight or less of iron, and 5% by weight or less of silicon.
- the aluminum content in the aluminum alloy exceeds 98% by weight, ductility is increased and the shape of the cap assembly 30 is deformed by external pressure, causing ignition or thermal runaway of the cylindrical secondary battery 100 to occur.
- the safety vent 32 may have a hardness of 15 Kgf/mm 2 to 35 Kgf/mm 2 , preferably a hardness of 20 Kgf/mm 2 to 30 Kgf/mm 2 .
- the safety vent 32 may have a yield strength of 1 Kgf/mm 2 to 5 Kgf/mm 2 , preferably a yield strength of 2 Kgf/mm 2 to 4 Kgf/mm 2 .
- the safety vent 32 may have an elongation of 35% to 45%, preferably 35% to 40%.
- the current blocking element 33 may include an aluminum material. More specifically, the current blocking element 33 may include an aluminum material having a purity of 90% or more. If the purity of aluminum of the current interruption element 33 is less than 90%, the hardness of the current interruption element 33 may increase and the shape deformation rate may increase due to external pressure.
- the current blocking element 33 may have a hardness of 10 Kgf/mm 2 to 30 Kgf/mm 2 , preferably a hardness of 15 Kgf/mm 2 to 25 Kgf/mm 2 .
- the current blocking element 33 may have a yield strength of 2 Kgf/mm 2 to 6 Kgf/mm 2 , preferably a hardness of 3 Kgf/mm 2 to 4 Kgf/mm 2 .
- the current blocking element 33 may have an elongation of 25% to 35%, preferably 25% to 30%.
- the yield strength and elongation of the safety vent and current interrupter were measured using a tensile tester in accordance with KS B 0802 (standard tensile test method for metallic materials) for the safety vent and current interrupter specimens.
- the current blocking device specimen was measured using a hardness tester in accordance with KS B 0805.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (11)
- 일측이 개구되고, 이차 전지 캔의 상부에 결합되는 캡 어셈블리에 있어서,상기 캡 어셈블리는상기 캔의 상부와 결합하는 탑 캡;상기 탑 캡의 하측에 위치되고, 상기 탑 캡의 끝 단부와 결합되는 안전 벤트 및상기 안전 벤트 하측에 위치되고, 상기 안전 벤트와 적어도 일부가 접촉되는 전류차단소자를 포함하고,상기 전류차단소자는 상기 안전 벤트보다 경도가 낮은 재료를 포함하는 캡 어셈블리.
- 청구항 1에 있어서, 상기 안전 벤트는 알루미늄 또는 알루미늄 합금을 포함하는 캡 어셈블리.
- 청구항 2에 있어서, 상기 안전 벤트는 알루미늄 85 중량% 내지 98 중량%, 망간 0 중량% 내지 7 중량% 이하, 철 0 중량% 내지 5 중량% 이하 및 실리콘 0 중량% 내지 5 중량% 이하를 포함하는 캡 어셈블리.
- 청구항 1에 있어서, 상기 전류차단소자는 알루미늄 소재를 포함하는 캡 어셈블리.
- 청구항 4에 있어서, 상기 전류차단소자는 순도 90% 이상의 알루미늄 소재를 포함하는 캡 어셈블리.
- 청구항 1에 있어서, 상기 안전 벤트는 경도가 15 Kgf/㎜2 내지 35 Kgf/㎜2인 것인 캡 어셈블리.
- 청구항 1에 있어서, 상기 전류차단소자는 경도가 10 Kgf/㎜2 내지 30 Kgf/㎜2인 것인 캡 어셈블리.
- 청구항 1에 있어서, 상기 안전 벤트는 항복 강도가 1 Kgf/㎜2 내지 5 Kgf/㎜2이고,상기 전류차단소자는 항복 강도가 2 Kgf/㎜2 내지 6 Kgf/㎜2인 캡 어셈블리.
- 청구항 1에 있어서, 상기 안전 벤트는 연신율이 25% 내지 35%이고,상기 전류차단소자는 연신율이 35% 내지 45%인 캡 어셈블리.
- 청구항 1에 있어서, 상기 안전 벤트는 중앙이 함몰된 만입형 중앙부, 상기 탑 캡의 끝 단부와 결합되는 테두리부 및 상기 만입형 중앙부와 상기 단부를 연결하는 벤팅부를 포함하고,상기 만입형 중앙부와 상기 테두리부 사이 노치가 포함되고,상기 벤팅부의 하면은 상기 테두리부의 상면과 0°내지 30°의 각도로 이루어지는 캡 어셈블리.
- 다수의 전극 및 분리막이 교대로 적층된 전지 조립체;일측이 개구되고, 내부에 상기 전지 조립체를 거치하는 캔 및청구항 1 내지 10 중 한 항에 따른 캡 어셈블리를 포함하는 이차 전지.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2023541373A JP7754431B2 (ja) | 2021-10-22 | 2022-10-21 | キャップアセンブリおよびそれを含む二次電池 |
| US18/271,201 US20240014504A1 (en) | 2021-10-22 | 2022-10-21 | Cap assembly and secondary battery comprising same |
| EP22884098.9A EP4258458A4 (en) | 2021-10-22 | 2022-10-21 | Cap assembly and secondary battery comprising same |
| CN202280009384.6A CN116686150A (zh) | 2021-10-22 | 2022-10-21 | 盖组件以及包括该盖组件的二次电池 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020210141748A KR20230057686A (ko) | 2021-10-22 | 2021-10-22 | 캡 어셈블리 및 이를 포함하는 이차 전지 |
| KR10-2021-0141748 | 2021-10-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023068876A1 true WO2023068876A1 (ko) | 2023-04-27 |
Family
ID=86059517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2022/016172 Ceased WO2023068876A1 (ko) | 2021-10-22 | 2022-10-21 | 캡 어셈블리 및 이를 포함하는 이차 전지 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20240014504A1 (ko) |
| EP (1) | EP4258458A4 (ko) |
| JP (1) | JP7754431B2 (ko) |
| KR (1) | KR20230057686A (ko) |
| CN (1) | CN116686150A (ko) |
| WO (1) | WO2023068876A1 (ko) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4262002A4 (en) * | 2020-12-14 | 2025-03-05 | Samsung SDI Co., Ltd. | CYLINDRICAL SECONDARY BATTERY |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025199386A1 (en) * | 2024-03-21 | 2025-09-25 | Novelis Inc. | Current interrupt device including high strength and high recycled content aluminum alloy |
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2021
- 2021-10-22 KR KR1020210141748A patent/KR20230057686A/ko active Pending
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2022
- 2022-10-21 US US18/271,201 patent/US20240014504A1/en active Pending
- 2022-10-21 JP JP2023541373A patent/JP7754431B2/ja active Active
- 2022-10-21 CN CN202280009384.6A patent/CN116686150A/zh active Pending
- 2022-10-21 EP EP22884098.9A patent/EP4258458A4/en active Pending
- 2022-10-21 WO PCT/KR2022/016172 patent/WO2023068876A1/ko not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100997043B1 (ko) * | 2006-10-23 | 2010-11-29 | 주식회사 엘지화학 | 누액 차단에 의해 안전성이 향상된 캡 어셈블리 및 이를포함하고 있는 원통형 이차전지 |
| KR20100039853A (ko) * | 2007-06-22 | 2010-04-16 | 보스톤-파워, 인크. | 리튬-이온 전지에 대한 cid 보유 장치 |
| KR20100041472A (ko) * | 2008-10-14 | 2010-04-22 | 주식회사 엘지화학 | 안전성이 향상된 캡 어셈블리 및 이를 포함하고 있는 원통형 이차전지 |
| KR20100096981A (ko) * | 2009-02-25 | 2010-09-02 | 삼성에스디아이 주식회사 | 이차 전지 |
| KR20200067897A (ko) * | 2017-12-13 | 2020-06-12 | 삼성에스디아이 주식회사 | 원통형 리튬 이온 이차 전지 |
| KR20210141748A (ko) | 2019-12-11 | 2021-11-23 | 노보 노르디스크 에이/에스 | 신규한 인슐린 유사체 및 이의 용도 |
Non-Patent Citations (1)
| Title |
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| See also references of EP4258458A4 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4262002A4 (en) * | 2020-12-14 | 2025-03-05 | Samsung SDI Co., Ltd. | CYLINDRICAL SECONDARY BATTERY |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4258458A1 (en) | 2023-10-11 |
| EP4258458A4 (en) | 2025-03-12 |
| CN116686150A (zh) | 2023-09-01 |
| JP7754431B2 (ja) | 2025-10-15 |
| JP2024502596A (ja) | 2024-01-22 |
| US20240014504A1 (en) | 2024-01-11 |
| KR20230057686A (ko) | 2023-05-02 |
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