WO2024080846A1 - Ensemble électrode et batterie secondaire le comprenant - Google Patents

Ensemble électrode et batterie secondaire le comprenant Download PDF

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Publication number
WO2024080846A1
WO2024080846A1 PCT/KR2023/015881 KR2023015881W WO2024080846A1 WO 2024080846 A1 WO2024080846 A1 WO 2024080846A1 KR 2023015881 W KR2023015881 W KR 2023015881W WO 2024080846 A1 WO2024080846 A1 WO 2024080846A1
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WO
WIPO (PCT)
Prior art keywords
electrode
electrode sheet
electrode assembly
sheet
cover
Prior art date
Application number
PCT/KR2023/015881
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English (en)
Korean (ko)
Inventor
박지성
Original Assignee
주식회사 엘지에너지솔루션
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 주식회사 엘지에너지솔루션 filed Critical 주식회사 엘지에너지솔루션
Priority claimed from KR1020230137082A external-priority patent/KR20240052706A/ko
Publication of WO2024080846A1 publication Critical patent/WO2024080846A1/fr

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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
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means

Definitions

  • the present invention relates to an electrode assembly and a secondary battery including the same.
  • Batteries that store electrical energy can generally be divided into primary batteries and secondary batteries.
  • Primary batteries are disposable consumable batteries
  • secondary batteries are rechargeable batteries manufactured using materials in which oxidation and reduction processes between current and materials can be repeated. That is, when a reduction reaction is performed on the material by current, the power is charged, and when an oxidation reaction is performed on the material, the power is discharged. As this charging and discharging is repeatedly performed, electricity is generated.
  • secondary batteries include cylindrical batteries in which the electrode assembly is built in a cylindrical metal can, square batteries in which the electrode assembly is built in a square metal can, and batteries in which the electrode assembly is built in a pouch-shaped case made of aluminum laminate sheet. It can be classified as a pouch-type battery, etc.
  • the cylindrical battery may have a jelly-roll-shaped electrode assembly in which the anode, cathode, and separator are wound together and placed inside the case.
  • FIG. 1 is a cross-sectional view schematically showing the cross section of a modified conventional electrode assembly 1
  • FIG. 2 is a side view schematically showing the cathode 2 constituting the conventional electrode assembly 1.
  • the electrode assembly 1 included in a conventional cylindrical secondary battery may have a structure in which a positive electrode, a negative electrode, and a separator are wound together. At this time, based on the state in which the electrode assembly 1 is wound, the positive electrode may be wound later than the negative electrode so that one end of the positive electrode is disposed outward from the center than the one end of the negative electrode.
  • the shape of the electrode assembly 1 may be deformed due to the empty space formed in the center of a conventional secondary battery depending on use.
  • the shape of the electrode assembly 1 of a conventional cylindrical secondary battery was most deformed mainly at the positive electrode end. Therefore, there was a problem in which the deformed anode end damaged the adjacent separator. In addition, as a result, short circuits, etc. occurred, and there were problems of reduced lifespan and performance deterioration of the secondary battery.
  • the negative electrode 2 included in the electrode assembly 1 of a conventional cylindrical secondary battery may have a shape in which a negative electrode tab is arranged in a substantially plate-shaped rectangular parallelepiped.
  • a tape may be attached to one end.
  • the tape may refer to an insulating tape for insulation.
  • the tape can play a role such as securing insulation performance and protecting the negative electrode tab. Therefore, the conventional cathode 2 did not have a structure to prevent the problem of the anode end being deformed due to use of a secondary battery damaging the adjacent separator.
  • the present invention was developed to solve the above problems.
  • the object of the present invention is to provide an electrode assembly that can improve safety and performance by preventing damage to adjacent separators due to deformation of the end of the positive electrode, and a secondary battery including the same. It is done.
  • the electrode assembly according to the present invention has a structure in which a first electrode sheet, a second electrode sheet, and a separator disposed between the first electrode sheet and the second electrode sheet are wound together, the first electrode sheet comprising: It is disposed at a certain distance from one end of the second electrode sheet in the winding direction and may include a deformation portion that protrudes toward the center based on the wound state.
  • the first electrode sheet is disposed at one end and may further include an uncoated portion in the form of an electrode tab provided on one side of the current collector and a holding portion in the form of an active material applied to both sides of the current collector.
  • the second electrode sheet may be placed in a position facing the holding portion of the first electrode sheet with the separator therebetween.
  • the deformable portion may be arranged to have a gap between the electrode tab and the holding portion in the uncoated portion.
  • the first electrode sheet further includes a cover portion attached to the uncoated portion, and the cover portion may have thermosetting properties.
  • the cover portion may be attached to be wound at least once.
  • the cover portion may have a thickness of 40 ⁇ m or more and 100 ⁇ m or less.
  • the cover part may include a first cover part attached to one surface of the uncoated area and covering a portion of the electrode tab, and a second cover part attached to the other surface of the uncoated area.
  • the first cover part may be attached to a length smaller than the length of the second cover part.
  • the first electrode sheet further includes a fixing part attached to a side of the deformation part opposite to the direction in which the deformation part protrudes, and the fixing part may have thermosetting properties.
  • the deformed portion may have a curved shape while maintaining a constant radius of curvature.
  • the deformed portion may have a radius of curvature of 0.05 mm or more and 0.8 mm or less.
  • the first electrode sheet may induce the degree of deformation of the deformable portion to increase as the usage time increases.
  • the secondary battery according to the present invention includes an electrode assembly having a structure in which a first electrode sheet, a second electrode sheet, and a separator disposed between the first electrode sheet and the second electrode sheet are wound together, and an exterior unit for accommodating the electrode assembly therein.
  • the first electrode sheet is disposed at a certain distance from one end of the second electrode sheet, and may include a deformed portion that protrudes toward the center based on the wound state.
  • the electrode assembly according to the present invention has a structure in which a first electrode sheet, a second electrode sheet, and a separator disposed between the first electrode sheet and the second electrode sheet are wound together, the first electrode sheet comprising: It is disposed at a certain distance from one end of the second electrode sheet in the winding direction and may include a deformation portion that protrudes toward the center based on the wound state.
  • the deformable portion is deformed, thereby suppressing deformation near the end of the anode, thereby preventing damage to the adjacent separator.
  • the safety and performance of the secondary battery including the electrode assembly can be improved.
  • FIG. 1 is a cross-sectional view schematically showing a cross-section of a modified conventional electrode assembly.
  • Figure 2 is a side view schematically showing a cathode constituting a conventional electrode assembly.
  • Figure 3 is a cross-sectional view schematically showing the wound electrode assembly according to Example 1 of the present invention.
  • Figure 4 is an exploded view schematically showing the electrode assembly according to Example 1 of the present invention before being wound.
  • Figure 5 is a side view schematically showing the first electrode sheet according to Example 1 of the present invention.
  • Figure 6 is a side view schematically showing the first electrode sheet according to Example 2 of the present invention.
  • the present invention provides an electrode assembly 10 as Example 1.
  • Figure 3 is a cross-sectional view schematically showing the wound electrode assembly 10 according to Example 1 of the present invention.
  • Figure 4 is an exploded view schematically showing the electrode assembly 10 according to Example 1 of the present invention before being wound
  • Figure 5 is an exploded view showing the first electrode sheet 100 according to Example 1 of the present invention. This is a schematic side view.
  • the electrode assembly 10 according to Example 1 of the present invention can be used to manufacture secondary batteries.
  • the electrode assembly 10 may refer to an electrode assembly having a wound structure
  • the secondary battery may refer to a cylindrical secondary battery.
  • the electrode assembly 10 may include a first electrode sheet 100, a second electrode sheet 200, and a separator 300.
  • the electrode assembly 10 has a separator 300 disposed between the first electrode sheet 100 and the second electrode sheet 200, and the first electrode sheet 100 and the second electrode sheet 200 ) and the separator 300 may have a structure wound together.
  • the first electrode sheet 100 may refer to a negative electrode sheet
  • the second electrode sheet 200 may refer to a positive electrode sheet.
  • the conventional electrode assembly 1 had a problem in which deformation near one end of the positive electrode sheet became worse as the secondary battery was used. Therefore, as an example of a configuration for preventing deformation near one end of the positive electrode sheet, the first electrode sheet 100 of the electrode assembly 10 according to Example 1 of the present invention may include a deformable portion 130. You can.
  • the deformable portion 130 of the first electrode sheet 100 is disposed at a certain distance from one end of the second electrode sheet 200, and may have a shape that protrudes toward the center based on the wound state. Specifically, the deformation portion 130 of the first electrode sheet 100 may be disposed at a certain distance from one end of the second electrode sheet 200 in the winding direction. The deformation part 130 may serve to first deform one end of the second electrode sheet 200 so that it is not deformed.
  • the first electrode sheet 100 according to Example 1 of the present invention can induce the degree of deformation of the deformable portion 130 to increase as the usage time of the secondary battery increases. Referring to FIG.
  • the deformable portion 130 is disposed at a position spaced apart from one end of the second electrode sheet 200 in the winding direction.
  • the degree of deformation continues to increase in the deformed portion. That is, as the usage time increases, the deformation of the electrode assembly 10 may become more severe in the deformed portion.
  • the deformation near one end of the second electrode sheet 200 increases mainly due to the use of the secondary battery, and the separator 300 adjacent to the one end of the deformed second electrode sheet 200 This may be damaged.
  • the first electrode sheet 100 of the electrode assembly 10 according to Example 1 of the present invention is arranged to be spaced a certain distance from one end of the second electrode sheet 200 in the winding direction, so that the second electrode sheet 200 ) can induce deformation of other parts other than one end to become worse, and deformation near one end of the second electrode sheet 200 can be prevented. This prevents the separator from being damaged and prevents additional problems, such as short circuits, from occurring due to damage to the separator.
  • the shape of the deformable portion 130 of the first electrode sheet 100 may vary, but the deformable portion 130 according to Example 1 of the present invention may have a curved shape while maintaining a constant radius of curvature. Specifically, the deformable portion 130 may have a substantially semicircular shape. Preferably, the radius of curvature of the deformable portion 130 may be 0.05 mm or more and 0.8 mm or less.
  • the electrode assembly 10 included inside the cylindrical secondary battery may have a wound jelly-roll shape.
  • the roughly sheet-shaped first electrode sheet 100, second electrode sheet 200, and separator 300 may be wound together.
  • a roughly cylindrical core may be placed inside for winding.
  • the deformable part 130 has a roughly semicircular shape
  • the deformed part 130 can be formed through a relatively simple process by using a core.
  • the deformable portion 130 may be formed by pressing the portion of the first electrode sheet 100 at the position where the deformed portion 130 is to be formed with the core. This is just one example of forming the deformation portion 130, and the deformation portion 130 may be formed through other methods.
  • the deformable portion 130 having a substantially semicircular shape may be formed on the first electrode sheet 100 using a cylindrical rod other than the core.
  • the deformation portion 130 does not need to be formed too large so as not to interfere with winding. This is because if the radius of curvature of the deformable portion 130 becomes too large, problems may occur in the winding process to form the electrode assembly 10.
  • the deformable portion 130 may be formed to have a radius of curvature that is approximately half or less of the radius of the rod.
  • the preferred radius of curvature of the deformed portion 130 considering the winding form, may be approximately 0.8 mm or less.
  • the radius of curvature of the deformed part 130 which has a substantially semicircular shape, may be approximately 0.05 mm or more.
  • the first electrode sheet 100 of the electrode assembly 10 according to Example 1 of the present invention may include an uncoated portion 110 and a holding portion 120.
  • the uncoated portion 110 of the first electrode sheet 100 is disposed at one end, and may have a shape in which an electrode tab 103 is provided on one side of the current collector 101, and the holding portion 120 may have the active material 102 applied to both sides of the current collector 101. More specifically, a portion of the current collector 101 to which the active material 102 is not applied may become the uncoated portion 110, and a portion to which the active material 102 is applied may become the holding portion 120.
  • the current collector 101 may be a substantially thin plate-shaped negative electrode current collector and may contain copper (Cu).
  • the second electrode sheet 200 of the electrode assembly 10 includes the holding portion 120 of the first electrode sheet 100 with the separator 300 interposed therebetween. It can be placed in a face-to-face position. Specifically, the first electrode sheet 100 may begin to be wound first, and then the second electrode sheet 200 may be wound together.
  • the separator may be disposed between the first electrode sheet 100 and the second electrode sheet 200 to separate the first electrode sheet 100 and the second electrode sheet 200.
  • the separator 300 may be additionally disposed during the winding process.
  • the first electrode sheet 100 according to Example 1 of the present invention may further include a cover portion 140.
  • the cover portion 140 may be attached to the uncoated portion 110 of the first electrode sheet 100 and may have thermosetting properties.
  • the cover portion 140 may be a thermosetting tape.
  • Thermosetting can mean the property of hardening when heat is applied.
  • the cover portion 140 of the first electrode sheet 100 may have a thickness of approximately 40 ⁇ m or more and 100 ⁇ m or less.
  • the cover part 140 may be a thermosetting tape.
  • the cover part 140 having a thickness of 40 ⁇ m or more and 100 ⁇ m or less can be a thermosetting tape that can be obtained relatively easily.
  • a process of forming a center hole with a hot object may be performed to form an empty space in the center.
  • the cover portion 140 which has thermosetting properties, may be hardened by the heat transmitted in this process.
  • the cover portion 140 may be made of a material that begins to harden around approximately 100 degrees.
  • the heat-hardened cover portion 140 not only suppresses deformation of one end of the second electrode sheet 200, but also suppresses deformation of the electrode assembly 10 itself by reinforcing its rigidity.
  • the cover portion 140 may be formed by being attached from one end of the first electrode sheet 100, or may be formed by being attached from a point approximately 3 to 4 mm away from the end for process efficiency.
  • the cover portion 140 of the first electrode sheet 100 includes the first cover portion 141 and the second cover portion 141. It may include a cover portion 142.
  • the first cover portion 141 may be attached to one side of the uncoated portion 110 to cover a portion of the electrode tab 103, and the second cover portion 142 may be attached to the other side of the uncoated portion 110. .
  • the first cover portion 141 and the second cover portion 142 may be attached to both sides of the current collector 101 with the current collector 101 interposed therebetween.
  • the first cover part 141 may be attached to the current collector 101 by a length smaller than the length of the second cover part 142.
  • the degree to which the cover part 140 suppresses deformation of the electrode assembly 10 can be strengthened.
  • the cover portion 140 of the first electrode sheet 100 according to Example 1 of the present invention can be attached to be wound at least once. there is. That is, in the wound state, the uncoated portion 110 of the first electrode sheet 100 may be wound one or more times.
  • the deformable part 130 is a part that induces deformation of the second electrode sheet 200 instead of deforming one end of the second electrode sheet 200, the cover part 140 may not be attached. Accordingly, the deformation part 130 according to the first embodiment of the present invention may be disposed between the uncoated part 110 and the holding part 120 so that the cover part 140 is easily attached only to the uncoated part 110. Specifically, referring to FIG. 5 , the first electrode sheet 100 may be arranged in the order of the uncoated portion 110, the deformed portion 130, and the holding portion 120 from one end.
  • the portion on which the active material 102 is not applied, excluding the deformed portion 130 is expressed as the uncoated portion 110.
  • the deformed portion 130 may be a part of the uncoated portion 110. That is, the deformation portion 130 may be formed at an end of the uncoated portion 110 adjacent to the holding portion 120 . Accordingly, the deformable portion 130 may be disposed between the electrode tab 103 and the holding portion 120 in the uncoated portion 110 to have a gap between the electrode tab 103 and the holding portion 120 .
  • the electrode assembly 10 according to Example 1 of the present invention suppresses deformation near the end of the second electrode sheet 200 by allowing the deformable portion 130 to deform as the usage time of the secondary battery increases, thereby preventing the adjacent separator from deforming. (300) can be prevented from being damaged. Additionally, by preventing damage to the separator 300, the safety and performance of the secondary battery including the electrode assembly 10 can be improved.
  • a secondary battery with improved safety and performance can be manufactured by housing the electrode assembly 10 according to Example 1 of the present invention in a wound state inside an exterior part.
  • the secondary battery may be a cylindrical secondary battery, and the exterior portion may have a substantially cylindrical can shape.
  • the present invention provides an electrode assembly including a first electrode sheet 100' of a different type as Example 2.
  • the first electrode sheet 100' of the electrode assembly according to Example 2 of the present invention may be different from the first electrode sheet 100 according to Example 1 in the presence or absence of a fixing part 150, etc.
  • Figure 6 is a side view schematically showing the first electrode sheet 100' according to Example 2 of the present invention.
  • the first electrode sheet 100' of the electrode assembly according to Example 2 of the present invention may further include a fixing part 150 attached to the deformable part 130'.
  • the fixing part 150 may be attached to the side opposite to the deformation part 130' in the direction in which the deformation part 130' protrudes, and may have thermosetting properties like the cover part 140.
  • the fixing part 150 may be a thermosetting tape.
  • the fixing part 150 may have a thickness of approximately 40 ⁇ m or more and 100 ⁇ m or less, like the cover part 140 described above.
  • the fixing part 150 may be hardened by heat transmitted in the process of forming a center hole with a hot object to form an empty space in the center during the manufacturing process of the electrode assembly.
  • the fixing part 150 may be made of a material that begins to harden around approximately 100 degrees.
  • the fixing part 150 may be attached to the concave surface of the deformable part 130'. Accordingly, the electrode assembly according to the second embodiment of the present invention includes the fixing part 150 and can induce deformation of the deformable part 130' to proceed in the direction toward the convex surface.
  • the convex surface to which the fixing part 150 is not attached has a relatively identical shape compared to the concave other surface to which the fixing part 150 is attached.
  • the fixing force that can maintain may become weak. Therefore, the first electrode sheet can be relatively efficiently induced to deform in the direction of one surface to which the deformable portion 130' is not attached.

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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)
  • Secondary Cells (AREA)
  • Cell Separators (AREA)

Abstract

La présente invention supprime la déformation à proximité de l'extrémité d'une électrode positive en permettant à une partie déformable de se déformer à mesure que le temps d'utilisation d'une batterie secondaire augmente, ce qui permet d'éviter d'endommager un séparateur adjacent. Un ensemble électrode selon la présente invention a une structure dans laquelle une première feuille d'électrode, une seconde feuille d'électrode et un séparateur disposé entre la première feuille d'électrode et la seconde feuille d'électrode sont enroulés ensemble, la première feuille d'électrode étant espacée d'une extrémité de la seconde feuille d'électrode dans la direction d'enroulement par une certaine distance et pouvant comprendre une partie déformable faisant saillie vers le centre sur la base de l'état enroulé.
PCT/KR2023/015881 2022-10-14 2023-10-13 Ensemble électrode et batterie secondaire le comprenant WO2024080846A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2022-0132752 2022-10-14
KR20220132752 2022-10-14
KR10-2023-0137082 2023-10-13
KR1020230137082A KR20240052706A (ko) 2022-10-14 2023-10-13 전극 조립체 및 이를 포함하는 이차 전지

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WO2024080846A1 true WO2024080846A1 (fr) 2024-04-18

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PCT/KR2023/015881 WO2024080846A1 (fr) 2022-10-14 2023-10-13 Ensemble électrode et batterie secondaire le comprenant

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WO (1) WO2024080846A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070000799A (ko) * 2005-06-28 2007-01-03 삼성에스디아이 주식회사 전극 조립체 및 이를 구비하는 리튬 이온 이차 전지
KR20200039278A (ko) * 2018-10-05 2020-04-16 주식회사 엘지화학 이차전지
CN111213278A (zh) * 2017-10-27 2020-05-29 三洋电机株式会社 非水电解质二次电池的制造方法
KR20200086932A (ko) * 2019-01-10 2020-07-20 주식회사 엘지화학 전극조립체와 그 전극조립체의 제조 방법과 그 전극조립체를 내장한 이차전지
KR20220092101A (ko) * 2020-12-24 2022-07-01 주식회사 엘지에너지솔루션 이차전지 및 이의 제조 방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070000799A (ko) * 2005-06-28 2007-01-03 삼성에스디아이 주식회사 전극 조립체 및 이를 구비하는 리튬 이온 이차 전지
CN111213278A (zh) * 2017-10-27 2020-05-29 三洋电机株式会社 非水电解质二次电池的制造方法
KR20200039278A (ko) * 2018-10-05 2020-04-16 주식회사 엘지화학 이차전지
KR20200086932A (ko) * 2019-01-10 2020-07-20 주식회사 엘지화학 전극조립체와 그 전극조립체의 제조 방법과 그 전극조립체를 내장한 이차전지
KR20220092101A (ko) * 2020-12-24 2022-07-01 주식회사 엘지에너지솔루션 이차전지 및 이의 제조 방법

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