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WO2014065637A1 - Appareil de coupure de prise de cellule dans une batterie au lithium secondaire et bloc-batterie comprenant celui-ci - Google Patents

Appareil de coupure de prise de cellule dans une batterie au lithium secondaire et bloc-batterie comprenant celui-ci Download PDF

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Publication number
WO2014065637A1
WO2014065637A1 PCT/KR2013/009607 KR2013009607W WO2014065637A1 WO 2014065637 A1 WO2014065637 A1 WO 2014065637A1 KR 2013009607 W KR2013009607 W KR 2013009607W WO 2014065637 A1 WO2014065637 A1 WO 2014065637A1
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WO
WIPO (PCT)
Prior art keywords
slider
cell
cutting
battery
unit
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
Application number
PCT/KR2013/009607
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English (en)
Korean (ko)
Inventor
이태구
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SK Innovation Co Ltd
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SK Innovation Co Ltd
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Filing date
Publication date
Application filed by SK Innovation Co Ltd filed Critical SK Innovation Co Ltd
Publication of WO2014065637A1 publication Critical patent/WO2014065637A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • 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
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • 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
    • 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
    • H01M50/579—Devices or arrangements for the interruption of current in response to shock
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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 cell tab cutting apparatus of a lithium secondary battery and a battery pack having the same.
  • Secondary batteries have been widely applied to a variety of portable electronic devices, such as smart phones, to electric vehicles in recent years, and their performance has been greatly improved through continuous research and development. Recently developed secondary batteries have a higher operating voltage and a higher energy density than conventional batteries.
  • the electrode active material when left in a high temperature environment or above a certain temperature, the electrode active material is activated in an unstable state, and suddenly reacts with the electrolyte to swell and explode.
  • the possibility of explosion and ignition of the lithium ion battery depends on the state of charge of the secondary battery. The more charged it is, the more likely it is to explode and ignite.
  • Swelling is a phenomenon in which a lithium ion battery swells and explodes. This swelling phenomenon occurs when the separator is damaged inside the cell due to overcharging of the lithium ion battery, as well as overdischarge or external shock.
  • a so-called protection circuit for connecting an active element called a PTC (Positive Temperature Coefficiency resistor) to the anode side in series and causing the internal resistance of the PTC to block input current during overcharging may be applied. It was.
  • the PTC suppresses the flow of current flowing into the secondary battery and prevents the battery from being charged any more, and only blocks the input current when the temperature of the secondary battery increases during overcharging. For example, it is not possible to protect a secondary battery when an already charged secondary battery is exposed to high temperature, overdischarged, or when an internal shock is damaged due to an external shock.
  • the present invention has been made to solve the above problems, and when the unit battery cell starts to swell, by cutting the cell tab using the swelling force, the overcharge and overdischarge as well as the explosion of the secondary battery due to the impact from the outside It is an object of the present invention to provide a cell tab cutting device for a lithium secondary battery and a battery pack having the same, which can easily solve the risk of ignition and, in particular, the configuration of a mechanism for cutting a cell tab is simple and there is no fear of failure. .
  • the cell tab cutting device of a lithium secondary battery of the present invention for achieving the above object is a state of being mounted on one side of a battery pack comprising a plurality of unit battery cells are packed side by side in a casing, the swell of the unit battery cell
  • the displacement member is; It is installed to be rotatable in the casing of the battery pack through the rotating shaft, and extends to one side of the unit battery cell is characterized in that the rotating member rotates around the rotating shaft when the unit battery cell swells.
  • the cutting unit A guide member fixed to the side of the cell tab and having a guide groove extending in the width direction of the cell tab, a slider movable along the guide groove while being supported by the guide member, and fixed to the slider and sliding of the slider It characterized in that it comprises a cutter for cutting the cell tab while passing the cell tab in the width direction during the movement, and slider driving means for slidingly moving the slider.
  • the slider driving means It is a compression coil spring that moves in the compressed state and the slider to move the slider during the rotation of the rotating member, the rotating member;
  • the stopper which is located on the travel path of the slider, suppresses the movement of the slider and exits the travel path when the rotating member is rotated by the swelling phenomenon, so that the slider slides under the expansion force of the spring. Characterized in that provided.
  • a locking groove is formed at a portion opposite to the cutter of the slider, and the stopper is characterized in that the movement of the slider is blocked while being fitted in the locking groove.
  • the casing may include a cover configured to openably cover an input / output unit in which the power input / output terminals of the battery pack are collected, and the rotation member may be rotatably installed on one side of the cover.
  • the rotating shaft of the rotating member may further include a support spring for elastically supporting the rotating member toward the unit battery cell.
  • the cutter is characterized in that it is fixed perpendicular to one side of the slider and inclined in the direction of movement of the slider.
  • the cutter It is fixed to one side of the slider and is rotatably supported by a support bracket providing a support force, characterized in that it takes the form of a disk.
  • a casing for accommodating the cell module and including a cover to openly cover the power terminal;
  • a displacement member rotatably installed at one side of the cover and extended to one side of the unit battery cell to be rotated by being pushed by a unit battery cell that swells in a thickness direction when a swelling phenomenon occurs; It is disposed on the side of the cell tab provided in the unit battery cell, characterized in that it comprises a cutting unit for cutting the cell tab by following the rotation of the displacement member.
  • the displacement member is;
  • the rotating shaft is installed to be rotatable on the cover and is characterized in that the rotating member extending to one side of the unit battery cell.
  • the cutting unit A guide member fixed to the side of the cell tab and having a guide groove extending in the width direction of the cell tab, a slider movable along the guide groove while being supported by the guide member, and fixed to the slider and sliding of the slider It characterized in that it comprises a cutter for cutting the cell tab while passing the cell tab in the width direction during the movement, and slider driving means for slidingly moving the slider.
  • the slider driving means It is a compression coil spring that moves in the compressed state and the slider to move the slider during the rotation of the rotating member, the rotating member;
  • the stopper which is located on the movement path of the slider and suppresses the movement of the slider and exits from the movement path when the rotating member is rotated by the swelling phenomenon, causes the slider to slide under the expansion force of the spring. Characterized in that provided.
  • the engaging groove is formed on the opposite side of the cutter of the slider, the stopper is characterized in that it is fitted into the hook groove to block the movement of the slider.
  • the rotating shaft of the rotating member may include a support spring for elastically supporting the rotating member toward the unit battery cell.
  • the cutter is fixed to one side of the slider vertically characterized in that it takes the form inclined in the direction of movement of the slider.
  • the cutter It is fixed to one side of the slider and is rotatably supported by a support bracket providing a support force, characterized in that it takes the form of a disk.
  • the risk of explosion and ignition of the secondary battery due to the impact from the battery can be easily solved.
  • the configuration of the mechanism for cutting the cell tab is simple and there is no fear of failure, and thus the reliability is high.
  • FIG. 1 is an exploded perspective view showing a cell tab cutting apparatus and a battery pack having the same of a lithium secondary battery according to an embodiment of the present invention.
  • FIG. 2 is a view for explaining the operation of the rotating member shown in FIG.
  • FIG. 3 is an exploded perspective view illustrating the cutting unit illustrated in FIG. 1.
  • FIG. 4 and 5 are exploded perspective views illustrating the structure of the cutting unit shown in FIG.
  • FIG. 6A through 6F are views sequentially showing a state in which cell tabs are cut by the cell tab cutting apparatus illustrated in FIG. 1.
  • FIG. 7 and 8 are views showing a cutter of another method that can be applied to the cutting unit.
  • FIG. 1 is an exploded perspective view illustrating a cell tab cutting device and a battery pack 11 having the same of a lithium secondary battery according to an embodiment of the present invention.
  • each cell module 13 is electrically connected to the outside through a terminal 13a while accommodating a plurality of unit battery cells (not shown).
  • the portion where the terminals 13a of the cell module 13 are collected is covered by the cover 15d as the input / output unit 19.
  • the cell module 15 accommodates a plurality of pouch-type unit battery cells and is connected to the outside through the terminal 13a.
  • the battery pack 11 is a package of a plurality of cell modules 15 in the casing (15).
  • the terminals 13a of the cell modules 15 are concentrated to form the input / output unit 19.
  • the casing 15 may include an upper case member 15a positioned above the cell module 13, a lower case member 15b disposed below the cell module 13, and the upper and lower case members 15. Located between the 15a, 15b and the side plate (15c) in contact with the cell module 13, and the cover (15d).
  • the cover 15d is part of the casing 15, and is wrapped and protected to open and close the input / output unit 19 in a state fixed to the upper and lower case members 15a and 15b.
  • the side plate 15c interviews the outer surface of the cell module located on the outside of the plurality of cell modules (13).
  • the side plate 15c is a metal plate plastically deformed by external force, for example, when the unit battery cell swells and expands in the thickness direction due to a swelling phenomenon, the side plate 15c is deformed by being pushed in the arrow Z direction.
  • the cell tab cutting device of the present embodiment uses a physical force when the side plate 15c is pushed in the direction of the arrow Z.
  • the cell tab 33 of the unit battery cell interviewed on the inner side surface of one side plate 15c is exposed to the input / output unit 19 side.
  • the cell tab 33 is a portion electrically connected to an external circuit, and is a portion to be cut by a cutter to be described later (when swelling occurs). When the cell tab 33 is cut, the external circuit and the battery pack 11 are electrically disconnected.
  • the rotating member 25 and the stopper 29 is rotatably installed on the cover (15d) and the cutting portion fixed to the side of the cell tab 33 ( 31).
  • the cutting unit 31 is fixed to the casing 15, and a separate bracket (not shown) may be applied to the cutting unit 31 so that the cutting unit 31 may be fixed at the position.
  • Two hinge portions 23 are formed on one side of the cover 15d so that the pivot member 25 can be rotatably installed.
  • the hinge portion 23 has a support hole 23a and supports the pivot shaft 25a of the pivot member 25 to be rotatable.
  • the rotation member 25 is a member that covers the cutting portion 31 while being supported by the hinge portion 23 and is in close contact with a part of the outer side surface of the side plate 15c. Since the rotating member 25 is in close contact with the outer surface of the side plate 15c in this manner, when the side plate 15c swells in the arrow z direction due to swelling, it is pushed in the same direction to center the rotating shaft 25a. Rotate to work.
  • a support spring 27 is further provided on the pivot shaft 25a so that the pivot member 25 can always be in close contact with the side plate 15c.
  • the support spring 27 is a torsion spring biased in the direction in which both ends are lifted.
  • the support spring 27 is wrapped in the rotational shaft 25a, and one end of the support spring 27 is formed in the spring support groove 23b formed in the cover 15d. The end is fixed to the spring support groove 25b provided in the rotation member 25. Due to the action of the support spring 27, the rotating member 25 is always in close contact with the side plate (15c) elastically.
  • the rotating member 25 is provided with a through hole 25c into which the stopper 29 is fitted.
  • the through hole 25c is a rectangular hole and has a stepped portion for supporting the head portion 29b of the stopper 29 on its inward surface.
  • the stopper 29 restrains upward movement of the slider 31b of the cutting portion 31 (when the rotation member 25 is in close contact with the side plate 15c) while being fitted into the through hole 25c. Element. When the rotating member 25 is pushed away from the cutting part 31 in the direction of arrow Z, no further restraining force is provided to the slider 31b. This will be described later.
  • the stopper 29 acts as a bar, and includes a head part 29b inserted into and fixed to the through hole 25c and a bar part 29a extending integrally with the head part 29b.
  • the latch portion 29a is inserted into the locking groove 31c of the slider 31b to be described later, and serves to restrain the slider 31b from moving up and down. As long as this function can be performed, the shape of the stopper 29 may vary.
  • the cutting portion 31 is vertically extended to the guide member 31a of the rectangular frame shape to provide a moving space (31f in FIG. 3) therein, and to the moving space 31f of the guide member 31a.
  • a slider 31b installed and slidable up and down and having a cutter (31k in FIG. 5) on one side, and a spring 31e elastically supporting the slider 31b to the upper portion in the drawing are configured.
  • the guide member 31a is fixed to the side of the cell tab 33 using various supporting brackets (not shown), and the slider 31b sliding along the moving space 31f moves the cell tab 33. Pass in the width direction. Detailed description of the guide member 31a will be described later.
  • FIG. 2A and 2B are diagrams for explaining the operation of the rotating member 25 shown in FIG.
  • the rotating member 25 is fitted to one side of the cover 15d so as to be rotatable.
  • the rotating shaft 25a of the rotating member 25 is supported by the hinge portion 23 so that the rotating member 25 can rotate in the direction of arrow b and the opposite direction.
  • the pivot member 25 is always elastically supported in the direction of arrow a as shown in FIG. It is elastically in contact with the side plate 15c.
  • FIG. 3 is an exploded perspective view illustrating the cutting unit illustrated in FIG. 1.
  • a cutting part 31 is provided on the side of the cell tab 33.
  • the cutting part 31 may include a guide member 31a extending in the width direction of the cell tab 33 and having a guide groove 31d formed on an inward surface thereof, and a cell tab (inside the guide member 31a). It consists of the slider 31b which slides in the width direction of 33. As shown in FIG.
  • FIG. 4 and 5 are exploded perspective views showing the structure of the cutting unit 31 shown in FIG. 3 in more detail.
  • the cutting portion 31 has a guide member 31a having a rectangular frame shape extending vertically, and side side protrusions 31g of both sides are inserted into the guide groove 31d of the guide member 31a.
  • a slider 31b slidable along the guide groove 31d, a cutter 31k fixed to one side of the slider 31b, and a spring 31e elastically supporting the slider 31b upwards.
  • a rectangular locking groove 31c is formed on the opposite side of the cutter 31k.
  • the locking groove 31c is a hole into which the latch portion 29a of the stopper 29 is fitted.
  • FIG. 6A through 6F are views sequentially showing a state in which cell tabs are cut by the cell tab cutting apparatus illustrated in FIG. 1.
  • FIG. 6A shows a steady state before swelling occurs.
  • the rotating member 25 stands by in the state in which the side plate 15c is in close contact.
  • the slider 31b of the cutting part 31 provided in the inside of the said rotation member 25 is pressed down by the stopper 29, lowering as much as possible, and a spring is compressed.
  • the cutter 31m shown in FIG. 7 is a disk cutter.
  • the cutter 31m is rotatably provided on one side of the slider 31b by the support bracket 31n.
  • the cutter 31m rotates when the slider 31b rises and passes through the cell tab 33 in the width direction, and cuts the cutting target portion of the cell tab 33.
  • the cutter 31p shown in FIG. 8 takes the form of a V-shaped blade. By applying the blade in the V-shape in this way, the cell tab 33 is cut in place without cutting back when cutting.
  • the shape of the cutter can be changed depending on the embodiment.
  • the cell tab cutting device which is configured as described above, cuts the cell tab 33 through mechanical means during swelling of the unit battery cell, and the cutting is very quick and accurate.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

La présente invention concerne un appareil de coupure d'une prise de cellule dans une batterie au lithium secondaire, et un bloc-batterie comprenant celui-ci. L'appareil de coupure est attaché sur un côté d'un bloc-batterie comprenant une pluralité de cellules de batterie d'unité empaquetées en ligne dans un boîtier, et coupe la prise de cellule de la cellule de batterie d'unité lorsque le phénomène de gonflement de celle-ci se produit, l'appareil de coupure comprenant : un élément de dislocation, qui s'étend vers un côté de la cellule de batterie d'unité, la position duquel est changée en étant poussée par le gonflement, dans la direction de la largeur, de la cellule d'unité de batterie ; et une unité de coupure, disposée sur le côté de la prise de cellule, pour couper la prise de cellule lorsque l'élément de dislocation est disloqué. Un appareil de coupure d'une prise de cellule dans une batterie au lithium secondaire et un bloc-batterie comprenant celui-ci selon la présente invention, telle que décrite ci-dessus, peuvent aborder simplement, en plus d'une surcharge et d'une surdécharge, les dangers d'explosion et d'allumage de la batterie secondaire par un impact externe par coupure des prises de cellule lorsque les cellules de batterie d'unité commencent à gonfler par utilisation de la force associée au gonflage de celles-ci, et comme le dispositif de coupure de la prise de cellule possède une construction simple et aucune raison de dysfonctionner, la fiabilité de celui-ci est élevée.
PCT/KR2013/009607 2012-10-26 2013-10-25 Appareil de coupure de prise de cellule dans une batterie au lithium secondaire et bloc-batterie comprenant celui-ci Ceased WO2014065637A1 (fr)

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KR1020120119858A KR101965398B1 (ko) 2012-10-26 2012-10-26 리튬이차전지의 셀 탭 커팅장치 및 이를 갖는 전지팩
KR10-2012-0119858 2012-10-26

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DE102015214094A1 (de) * 2015-07-24 2017-01-26 Bayerische Motoren Werke Aktiengesellschaft Mechanische Notabschaltvorrichtung für eine stromführende Leitung in einem Kraftfahrzeug und Kraftfahrzeug mit einer solchen Notabschaltvorrichtung
CN107196008A (zh) * 2017-06-01 2017-09-22 金山电化工业（惠州）有限公司 一种电池组拆卸机构
EP3512008A4 (fr) * 2017-07-06 2019-10-02 LG Chem, Ltd. Module de batterie et bloc-batterie, et véhicule les comprenant

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KR102364159B1 (ko) * 2017-08-01 2022-02-18 주식회사 엘지에너지솔루션 전극 탭 절단 장치를 포함하는 파우치형 이차전지
KR102203250B1 (ko) * 2017-11-29 2021-01-13 주식회사 엘지화학 엔드 프레임을 구비한 배터리 모듈
KR102494847B1 (ko) 2021-04-02 2023-02-06 주식회사 원익피앤이 이차전지 셀의 테라스 커팅장치 및 커팅방법

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