WO2018004144A1 - Secondary battery and manufacturing method therefor - Google Patents

Secondary battery and manufacturing method therefor Download PDF

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Publication number
WO2018004144A1
WO2018004144A1 PCT/KR2017/005966 KR2017005966W WO2018004144A1 WO 2018004144 A1 WO2018004144 A1 WO 2018004144A1 KR 2017005966 W KR2017005966 W KR 2017005966W WO 2018004144 A1 WO2018004144 A1 WO 2018004144A1
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WO
WIPO (PCT)
Prior art keywords
sewing
secondary battery
case
sealing
electrode
Prior art date
Application number
PCT/KR2017/005966
Other languages
French (fr)
Korean (ko)
Inventor
황수지
최용수
김상훈
유형균
이지훈
Original Assignee
주식회사 엘지화학
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 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN201790000363.2U priority Critical patent/CN207938661U/en
Publication of WO2018004144A1 publication Critical patent/WO2018004144A1/en

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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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/197—Sealing members characterised by the material having a layered structure
    • 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
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
    • 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
    • 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 and a method of manufacturing the same, and more particularly, to a secondary battery and a method of manufacturing the same, which prevents venting by increasing the bondability of the pouch sealing part.
  • a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged.
  • Such a secondary battery is widely used in advanced electronic devices such as phones, notebook computers, and camcorders.
  • Such a secondary battery is a jelly-roll type wound by separating a separator between a sheet-shaped cathode and an anode coated with an active material, and a plurality of anodes and cathodes are sequentially stacked in a state where the separator is interposed therebetween. Stacked and stacked unit cells can be roughly classified into a stack / folding type wound with a long length of separation film.
  • the present invention is to provide a secondary battery that can withstand high temperature and high pressure to increase the mechanical strength of the case and a method of manufacturing the same.
  • a secondary battery according to an embodiment of the present invention for achieving the above object is an electrode assembly; And a case in which the electrode assembly is accommodated, and the case may include a receiving part in which the electrode assembly is accommodated, and a sealing part and a sewing part formed on an outer circumferential surface of the receiving part.
  • the sealing part may be formed by heat-sealing the outer circumferential surface of the receiving part, and the sewing part may be formed along the sealing part.
  • the sealing portion may be formed by thermally fusion a portion excluding the edge from the outer circumferential surface of the accommodation portion, and the sewing portion may be formed at the edge on the outer circumferential surface of the accommodation portion.
  • the first electrode lead and the second electrode lead drawn out of the case are coupled to the electrode assembly, and the sewing portion is formed at a portion except for an outer circumferential surface portion of the accommodating portion in which the first electrode lead and the second electrode lead are positioned. Can be.
  • the first electrode lead and the second electrode lead may be coupled to both ends of the electrode assembly to face in opposite directions.
  • the sewing unit may be formed by sewing the outer circumferential surface of the accommodation unit with a sewing thread.
  • the sewing thread may be sewn on the outer circumferential surface of the accommodating portion by sewing any one of a herringbone stitch, a back stitch, and a hemming sitch.
  • the sewing thread may be formed of an inner sewing material and an outer sewing material.
  • the outer sewing material may be formed of a synthetic resin that is melted by heat.
  • the outer sewing material may seal when the outer thread is melted when the outer threaded surface of the accommodating part of the sewing thread is sewn to seal a gap between the sewing thread and the accommodating part.
  • the inner sewing material may have a higher melting point and strength than the outer sewing material.
  • the inner sewing material may be formed of any one of a metal, a polymer material, and a fabric having flexibility.
  • Method of manufacturing a secondary battery according to an embodiment of the present invention having such a configuration is a preparation step (S10) for preparing an electrode assembly;
  • it may include a sewing step (S30) for forming a sewing on the outer peripheral surface of the case.
  • the sealing step (S20) may heat seal the outer circumferential surface of the case to form a sealing part, and the sewing step (S30) may sew along the sealing part to form a sewing part.
  • the sealing step (S20) may form a sealing portion by heat-sealing the portion except the edge on the outer peripheral surface of the case
  • the sewing step (S30) may form a sewing portion by sewing the edge on the outer peripheral surface of the case.
  • the sewing step (S30) may be formed by sewing the outer peripheral surface of the receiving portion with a sewing thread.
  • the sewing thread may be formed of an inner sewing material and an outer sewing material.
  • the outer sewing material may be formed of a synthetic resin that is melted by heat.
  • the inner sewing material may have a higher melting point and strength than the outer sewing material.
  • the sewing step (S30) further comprises a thermal fusion step (S40) for thermally fusion bonding the outer circumferential surface of the case in which the sewing unit is formed
  • the thermal fusion step (S40) is the outer sewing material of the sewing thread formed the sewing unit Melting may seal the gap between the sewing thread and the case.
  • the first electrode, the separator and the second electrode are alternately stacked, and then a first electrode lead is coupled to the first electrode tab of the first electrode, and the second electrode tab of the second electrode is combined.
  • the electrode assembly may be manufactured by bonding a second electrode lead to the second electrode lead.
  • the first electrode lead and the second electrode lead may be coupled to both ends of the electrode assembly so as to face in opposite directions, respectively, and may be drawn out of the case.
  • the sewing step (S30) may form a sewing unit by sewing a portion except the outer peripheral surface of the case in which the first electrode lead and the second electrode lead is located.
  • the present invention has the following effects.
  • the sealing portion and the sealing portion formed on the outer circumferential surface of the case can be formed to overlap or not overlap each other to increase the sealing force of the case, in particular it can effectively prevent the venting.
  • the sealing portion can be formed by heat-sealing the outer peripheral surface of the case to increase the sealing force of the outer peripheral surface of the case.
  • the sewing unit is formed by sewing the outer peripheral surface of the case with a sewing thread can increase the bonding force of the outer peripheral surface of the case can effectively prevent the venting.
  • the sewing thread is formed in a double structure, the outer sewing material is provided with a synthetic resin that is melted by heat to seal the hole formed in the outer peripheral surface of the case through which the sewing thread passes through the melting of the outer sewing material.
  • the sewing thread is formed in a double structure, the inner sewing material is provided to have a higher melting point and strength than the outer sewing material to prevent the inner sewing material is melted during the melting of the outer sewing material, thereby increasing the sewing force of the case Can be.
  • the sewing unit sews a portion other than the outer circumferential surface of the case in which the electrode lead coupled to the electrode assembly is located, thereby preventing the sewing failure due to the strength of the electrode lead in advance.
  • FIG. 1 is a perspective view illustrating a rechargeable battery according to a first exemplary embodiment of the present invention.
  • FIG. 2 is a cross-sectional view taken along the line A-A shown in FIG.
  • FIG. 3 is an enlarged cross-sectional view taken along the line B-B shown in FIG.
  • FIG. 4 is a perspective view illustrating an electrode assembly of a secondary battery according to a first embodiment of the present invention.
  • FIG. 5 is a perspective view illustrating a sewing thread of a secondary battery according to a first embodiment of the present invention
  • FIG. 6 is a cross-sectional view of FIG.
  • FIGS. 7A to 7F are diagrams illustrating the types of stitches that form a sewing unit.
  • FIG. 8 is a flow chart showing a secondary battery manufacturing method according to a first embodiment of the present invention.
  • FIG. 9 is a view showing an electrode assembly preparation step in a secondary battery manufacturing method according to a first embodiment of the present invention.
  • FIG. 10 is a view showing a case sealing step in the method of manufacturing a secondary battery according to a first embodiment of the present invention.
  • FIG. 11 is a view showing a case sewing step in the method of manufacturing a secondary battery according to a first embodiment of the present invention.
  • FIG. 12 is a view showing a sewing unit heat fusion step in the method of manufacturing a secondary battery according to the first embodiment of the present invention.
  • FIG. 13 is a cross-sectional view taken along the line C-C shown in FIG. 12.
  • FIG. 14 is a perspective view illustrating a rechargeable battery according to a second exemplary embodiment of the present invention.
  • 15 is a flowchart illustrating a method of manufacturing a secondary battery according to a second embodiment of the present invention.
  • 16 is a view illustrating a case sealing step in the method of manufacturing a secondary battery according to a second embodiment of the present invention.
  • 17 is a view showing a case sewing step in the method of manufacturing a secondary battery according to a second embodiment of the present invention.
  • FIG. 18 is a view showing a sewing unit heat fusion step in the method of manufacturing a secondary battery according to a second embodiment of the present invention.
  • the secondary battery 100 includes an electrode assembly 110 and a case 120 in which the electrode assembly 110 is accommodated.
  • the electrode assembly 110 has a structure in which a plurality of electrodes having a different polarity and a plurality of separators are alternately stacked.
  • the plurality of electrodes may be a first electrode and a second electrode, and the plurality of separators may be a first separator and a second separator. That is, the electrode assembly 110 may have a structure in which the first electrode, the first separator, the second electrode, and the second separator are alternately stacked.
  • the first electrode tab is formed on the first electrode, and the second electrode tab is formed on the second electrode.
  • the first electrode lead 111 is coupled to the first electrode tab, and the second electrode lead 112 is coupled to the second electrode tab.
  • the first electrode lead 111 and the second electrode lead 112 are drawn out of the case 120, and are coupled to both ends of the electrode assembly 110 to face in opposite directions. That is, the present invention forms a sewing part on the outer circumferential surface of the case 120, and is coupled to one end of the electrode assembly 110 in a state in which the first electrode lead 111 and the second electrode lead 112 face in the same direction. If there is a difficulty in forming a sewing part on the outer peripheral surface of the case 120 between the first electrode lead 111 and the second electrode lead 112, even if the sewing part is formed, the sewing force is weak, and venting can be prevented. Thus, the present invention can obtain the highest efficiency when the first electrode lead 111 and the second electrode lead 112 is applied to the secondary battery facing the opposite direction.
  • the case 120 is formed by coupling the upper case and the lower case with the electrode assembly 110 interposed therebetween, the receiving portion 121 in which the electrode assembly 110 is accommodated, and the receiving portion. It includes a sealing portion 122 formed on the outer peripheral surface of (121).
  • the case 120 receives the electrode assembly 110 in the accommodating part 121, and then seals the accommodating part 121 by forming a sealing part 122 on an outer circumferential surface thereof.
  • the outer circumferential surface of the case 120 is further formed with a sewing unit 130, and the sewing unit 130 may increase the coupling force of the outer circumferential surface of the case 120 and effectively prevent venting to increase safety.
  • the secondary battery 100 further includes a sewing unit 130 together with the sealing unit 122 on the outer circumferential surface of the case 120 as shown in FIG. 1.
  • the sewing unit 130 improves the coupling force of the outer circumferential surface of the case 120, thereby preventing the sealing unit 122 from opening even when the internal pressure of the case 120 increases, thereby effectively preventing venting. It can increase safety.
  • the sewing unit 130 may be formed together with the sealing unit 122 on the outer circumferential surface of the case 120.
  • the outer peripheral surface of the case 120 may be formed so that the sealing portion 122 and the sewing unit 130 overlap. That is, the sealing part 122 is formed by heat-sealing the outer circumferential surface of the accommodating part 121, and the sewing part 130 is formed along the sealing part 122.
  • the sealing part 122 and the sewing part 130 are overlapped on the outer circumferential surface of the case 120 so that the work is possible even if the space of the outer circumferential surface of the case 120 is narrow, in particular, the sealing part 122 and the sewing part ( The area of 130) can be secured as much as possible to increase the sealing force and bonding force.
  • the sewing unit 130 may be formed by sewing the outer circumferential surface of the accommodation unit 121 with the sewing thread 131. That is, referring to FIG. 3, the sewing thread 131 is passed through the upper and lower surfaces of the sealing portion 122 in a zigzag to form the sewing portion 130, thereby increasing the coupling force of the sealing portion 122.
  • the sewing thread 131 may form the sewing part 130 in various shapes and structures according to a method of sewing, or may form two or more sewing parts 130 using two or more sewing threads 131. .
  • the sewing unit 130 may be formed at portions other than the outer circumferential surface portions of the accommodation unit 121 in which the first electrode lead 111 and the second electrode lead 112 are located. That is, since the first electrode lead 111 and the second electrode lead 112 are made of a material having strength, sewing is impossible, and even when sewing, the first electrode lead 111 and the first electrode lead 111 are required. The workability may be improved by forming the portion except the outer circumferential surface portion of the accommodating part 121 where the two electrode leads 112 are located.
  • a hole is formed in the outer circumferential surface of the case 120 in which the sewing thread 131 is sewn, and the sealing force of the sealing part 122 is reduced by this hole.
  • the gap between the hole formed in the outer circumferential surface of the sewing thread 131 and the case 120 may be sealed, thereby increasing the sealing force of the sealing part 122.
  • the sewing thread 131 may be formed of a double structure, that is, an inner sewing material 131a and an outer sewing material 131b, as shown in FIGS. 5 and 6, and an outer sewing material 131b.
  • the inner sewing material 131a has a higher melting point and strength than the outer sewing material 131b, thereby preventing the melting of the inner sewing material 131a and increasing the bondability of the sealing part 122 through high strength. have.
  • the inner sewing material 131a may be provided with a material having flexibility, and in particular, may be any one of a metal, a polymer material, and a fabric.
  • the sewing unit 130 may increase the coupling force of the sealing unit 122, thereby solving the problem that the sealing unit 122 is bent by the internal pressure of the case 120.
  • the sewing thread 131 is formed on the outer circumferential surface of the accommodating part 121 (herringbone stitch, see FIGS. 7A and 7B), stitching (back stitch, see FIGS. 7C and 7D), and hemming sitch (FIGS. 7E and 7E). 7F) may be sewn by sewing. That is, the sewing unit 130 may be formed on the outer circumferential surface of the accommodation unit 121 by sewing in various ways.
  • the secondary battery according to the first embodiment of the present invention may increase safety by including the sealing part 122 and the sewing part 130 on the outer circumferential surface of the case 120.
  • the manufacturing method of the secondary battery according to the first embodiment of the present invention having the configuration as described above is as follows.
  • a preparation step (S10) of preparing the electrode assembly 110 and an electrode assembly 110 of the housing 120 of the case 120 After receiving in the 121, the sealing step (S20) to form a sealing portion 122 by sealing the outer peripheral surface of the case 110, and the sewing step of forming a sewing unit 130 on the outer peripheral surface of the case 120 ( S30).
  • the preparation step S10 prepares the electrode assembly 110 in which the first electrode lead 111 and the second electrode lead 112 are coupled in both directions. That is, in the preparation step S10, after the first electrode, the separator, and the second electrode are alternately stacked, the first electrode lead 111 is coupled to the first electrode tab of the first electrode, and the second electrode The electrode assembly 110 is prepared by bonding the second electrode lead 112 to the second electrode tab.
  • first electrode lead 111 and the second electrode lead 112 are respectively coupled to both ends of the electrode assembly 110 to face in opposite directions.
  • the electrode assembly 110 is accommodated in the accommodating part 121 of the case 120. At this time, the tip of the first electrode lead 111 and the tip of the second electrode lead 112 are positioned to be drawn out of the case 120.
  • the electrode assembly 110 is accommodated in the case 120, and then the outer circumferential surface of the case 120 is heat-sealed to form a sealing portion 122.
  • the sewing step S30 is sewn with the sewing thread 131 along the sealing part 122 of the case 120 to form the sewing part 130, and the sewing part 130 is sealed.
  • the bonding force of the part 122 is increased.
  • the sewing thread 131 is provided with the inner sewing material 131a and the outer sewing material 131b, and the outer sewing material 131b is made of a synthetic resin melted by heat.
  • the inner sewing material 131a has a higher melting point and strength than the outer sewing material 131b.
  • the sewing unit 130 is formed by sewing portions except the outer circumferential surface of the case 120 in which the first electrode lead 111 and the second electrode lead 112 are located. That is, since it is difficult to sew the first electrode lead 111 and the second electrode lead 112 together, the state except the outer circumferential surface of the case 120 having the first electrode lead 111 and the second electrode lead 112 is excluded. By forming the sewing unit 130 to increase the workability.
  • a heat fusion step (S40) of performing heat fusion on the outer circumferential surface of the case 120 in which the sewing unit 130 is formed is further performed.
  • the outer circumferential surface of the case 120, the sewing unit 130 is formed by the heat fusion apparatus. Then, the outer sewing material 131b of the sewing thread 131 forming the sewing unit 130 is melted and flows into the hole of the case 120 formed by the sewing thread 131, thereby forming a hole formed in the case 120. Seal. That is, the gap between the sewing unit 130 and the case 120 may be sealed.
  • the secondary battery 100 when the thermal fusion step S40 is completed, the secondary battery 100 according to the first embodiment in which the sealing unit 122 and the sewing unit 130 are formed may be completed.
  • the secondary battery 100 ′ includes an electrode assembly 110 and a case 120 in which the electrode assembly 110 is accommodated.
  • 120 includes a receiving part 121 in which the electrode assembly 110 is accommodated, a sealing part 122 and a sewing part 130 formed on an outer circumferential surface of the receiving part 121.
  • the secondary battery 100 ′ according to the second embodiment of the present invention may be formed on the outer circumferential surface of the accommodating part so that the sealing part 122 and the sewing part 130 do not overlap each other, and thus the sewing part 130 and It is possible to prevent the sealing force from being weakened when the sealing unit 220 overlaps.
  • the sealing part 122 is formed by thermally fusion a portion excluding the edge from the outer circumferential surface of the accommodating part 121
  • the sewing part 130 is a sewing thread 131 at the edge of the outer circumferential surface of the accommodating part 121. It is formed by sewing.
  • the sealing portion 122 and the sewing portion 130 are formed on the outer circumferential surface of the case 120 to improve the sealing force through the sealing portion 122, and sewing It is possible to simultaneously improve the coupling force of the sealing part 122 through the part 130.
  • a preparation step (S10) of preparing an electrode assembly 110 and an electrode assembly 110 of an accommodating part of a case 120 are provided.
  • the sealing step (S21) to form a sealing portion 122 by sealing the portion except the edge on the outer peripheral surface of the case 110, and the sewing portion 130 on the edge on the outer peripheral surface of the case 120 It includes a sewing step (S31) to form a).
  • the preparation step S10 prepares the electrode assembly 110 in which the first electrode lead 111 and the second electrode lead 112 are combined in both directions.
  • the preparation step (S10) is the same as the preparation step of the secondary battery manufacturing method according to the first embodiment described above, detailed description thereof will be omitted.
  • the electrode assembly 110 is accommodated in the accommodating part 121 of the case 120. At this time, the tip of the first electrode lead 111 and the tip of the second electrode lead 112 are positioned to be drawn out of the case 120.
  • the electrode assembly 110 is accommodated in the case 120, and then a portion of the outer circumferential surface of the case 120 except for the edge is heat-sealed to form a sealing portion 122.
  • the sewing step S31 is sewn with the sewing thread 131 along the edge of the case 120 to form the sewing unit 130.
  • the sewing thread 131 has the same configuration as the sewing thread of the secondary battery manufacturing method according to the first embodiment described above, and thus a detailed description thereof will be omitted.
  • the outer circumferential surface of the case 120 in which the sealing part 122 is not formed is sewn with the sewing thread 131 to form the sewing part 130.
  • a heat fusion step (S41) for further heat-sealing the outer peripheral surface of the case 120, the sewing unit 130 is formed.
  • the outer circumferential surface of the case 120 in which the sewing unit 130 is formed is heat-sealed. Then, the outer sewing material 131b of the sewing thread 131 forming the sewing unit 130 is melted and flows into the hole of the case 120 formed by the sewing thread 131, thereby forming a hole in the case 120. Seal. That is, the gap between the sewing unit 130 and the case 120 may be sealed.
  • the secondary battery 100 according to the second embodiment of the present invention may be formed so as not to overlap the sealing portion 122 and the sewing portion 130 on the outer circumferential surface of the case 120, and thus the sewing portion 130. By this, the weakening of the sealing force of the sealing part 122 can be prevented.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)

Abstract

The present invention relates to a secondary battery, which comprises: an electrode assembly; and a case in which the electrode assembly is received, wherein the case includes a reception portion in which the electrode assembly is received, and a sealing portion and a sewing portion formed on an outer circumferential surface of the reception portion.

Description

이차전지 및 그의 제조방법Secondary Battery and Manufacturing Method Thereof
관련출원과의 상호인용Citation with Related Applications
본 출원은 2016년 06월 27일자 한국특허출원 제10-2016-0080010호에 기초한 우선권의 이익을 주장하며, 해당 한국특허출원의 문헌에 개시된 모든 내용은 본 명세서의 일부로서 포함된다.This application claims the benefit of priority based on Korean Patent Application No. 10-2016-0080010 dated June 27, 2016, and all the contents disclosed in the literature of that Korean patent application are incorporated as part of this specification.
기술분야Technical Field
본 발명은 이차전지 및 그의 제조방법에 관한 것으로서, 특히 파우치 실링부의 결합성을 높여 벤팅(venting)을 방지한 이차전지 및 그의 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery and a method of manufacturing the same, and more particularly, to a secondary battery and a method of manufacturing the same, which prevents venting by increasing the bondability of the pouch sealing part.
일반적으로 이차 전지(secondary battery)는 충전이 불가능한 일차 전지와는 달리 충전 및 방전이 가능한 전지를 말하며, 이러한 이차 전지는 폰, 노트북 컴퓨터 및 캠코더 등의 첨단 전자 기기 분야에서 널리 사용되고 있다.Generally, a secondary battery refers to a battery that can be charged and discharged, unlike a primary battery that cannot be charged. Such a secondary battery is widely used in advanced electronic devices such as phones, notebook computers, and camcorders.
이와 같은 이차전지는 활물질이 도포된 시트형의 양극과 음극 사이에 분리막을 개재(介在)하여 권취한 젤리 롤(Jelly-roll)형, 다수의 양극과 음극을 분리막이 개재된 상태에서 순차적으로 적층한 스택형, 및 스택형의 단위 셀들을 긴 길이의 분리 필름으로 권취한 스택/폴딩형으로 대략 분류할 수 있다.Such a secondary battery is a jelly-roll type wound by separating a separator between a sheet-shaped cathode and an anode coated with an active material, and a plurality of anodes and cathodes are sequentially stacked in a state where the separator is interposed therebetween. Stacked and stacked unit cells can be roughly classified into a stack / folding type wound with a long length of separation film.
본 발명은 케이스의 기계적 강도가 증가되어 고온 및 고압에 견딜 수 있는 이차전지 및 그 제조방법을 제공하기 위한 것이다.The present invention is to provide a secondary battery that can withstand high temperature and high pressure to increase the mechanical strength of the case and a method of manufacturing the same.
상기와 같은 목적을 달성하기 위한 본 발명의 일 실시예에 따른 이차전지는 전극 조립체; 및 상기 전극 조립체가 수용되는 케이스를 포함하며, 상기 케이스는 상기 전극 조립체가 수용되는 수용부와, 상기 수용부의 외주면에 형성되는 실링부 및 재봉부를 포함할 수 있다.A secondary battery according to an embodiment of the present invention for achieving the above object is an electrode assembly; And a case in which the electrode assembly is accommodated, and the case may include a receiving part in which the electrode assembly is accommodated, and a sealing part and a sewing part formed on an outer circumferential surface of the receiving part.
상기 실링부는 상기 수용부의 외주면을 열 융착하여 형성되고, 상기 재봉부는 상기 실링부를 따라 형성될 수 있다.The sealing part may be formed by heat-sealing the outer circumferential surface of the receiving part, and the sewing part may be formed along the sealing part.
상기 실링부는 상기 수용부의 외주면에서 가장자리를 제외한 부분을 열 융착함에 따라 형성되고, 상기 재봉부는 상기 수용부의 외주면에서 상기 가장자리에 형성될 수 있다.The sealing portion may be formed by thermally fusion a portion excluding the edge from the outer circumferential surface of the accommodation portion, and the sewing portion may be formed at the edge on the outer circumferential surface of the accommodation portion.
상기 전극 조립체에는 상기 케이스의 밖으로 인출되는 제1 전극리드와 제2 전극리드가 결합되며, 상기 재봉부는 상기 제1 전극리드와 상기 제2 전극리드가 위치한 상기 수용부의 외주면 부분을 제외한 부분에 형성될 수 있다.The first electrode lead and the second electrode lead drawn out of the case are coupled to the electrode assembly, and the sewing portion is formed at a portion except for an outer circumferential surface portion of the accommodating portion in which the first electrode lead and the second electrode lead are positioned. Can be.
상기 제1 전극리드와 상기 제2 전극리드는 서로 반대방향을 향하도록 상기 전극 조립체의 양 단부에 각각 결합될 수 있다. The first electrode lead and the second electrode lead may be coupled to both ends of the electrode assembly to face in opposite directions.
상기 재봉부는 상기 수용부의 외주면을 재봉실로 재봉하여 형성될 수 있다.The sewing unit may be formed by sewing the outer circumferential surface of the accommodation unit with a sewing thread.
상기 재봉실은 상기 수용부의 외주면에 새발뜨기(herringbone stitch), 박음질(back stitch) 및 감침질(hemming sitch) 중 어느 하나의 바느질로 재봉될 수 있다.The sewing thread may be sewn on the outer circumferential surface of the accommodating portion by sewing any one of a herringbone stitch, a back stitch, and a hemming sitch.
상기 재봉실은 내측 재봉물질과 외측 재봉물질로 형성될 수 있다.The sewing thread may be formed of an inner sewing material and an outer sewing material.
상기 외측 재봉물질은 열에 의해 용융되는 합성수지로 형성될 수 있다.The outer sewing material may be formed of a synthetic resin that is melted by heat.
상기 외측 재봉물질은 상기 재봉실이 재봉된 상기 수용부의 외주면을 열융착할 시 용융되면서 상기 재봉실과 상기 수용부 사이의 틈새를 밀봉할 수 있다.The outer sewing material may seal when the outer thread is melted when the outer threaded surface of the accommodating part of the sewing thread is sewn to seal a gap between the sewing thread and the accommodating part.
상기 내측 재봉물질은 상기 외측 재봉물질 보다 높은 용융점과 강도를 가질 수 있다.The inner sewing material may have a higher melting point and strength than the outer sewing material.
상기 내측 재봉물질은 유연성을 가지는 금속, 고분자 물질 및 직물 중 어느 하나로 형성될 수 있다.The inner sewing material may be formed of any one of a metal, a polymer material, and a fabric having flexibility.
이와 같은 구성을 가진 본 발명의 일 실시예에 따른 이차전지의 제조방법은 전극 조립체를 준비하는 준비단계(S10); 상기 전극 조립체를 케이스의 수용부에 수용한 다음, 상기 케이스의 외주면을 실링하여 실링부를 형성하는 실링단계(S20); 및 상기 케이스의 외주면에 재봉부를 형성하는 재봉단계(S30)를 포함할 수 있다.Method of manufacturing a secondary battery according to an embodiment of the present invention having such a configuration is a preparation step (S10) for preparing an electrode assembly; A sealing step (S20) of accommodating the electrode assembly in the accommodation part of the case and then sealing an outer circumferential surface of the case to form a sealing part; And it may include a sewing step (S30) for forming a sewing on the outer peripheral surface of the case.
상기 실링단계(S20)는 상기 케이스의 외주면을 열 융착하여 실링부를 형성하고, 상기 재봉단계(S30)는 상기 실링부를 따라 재봉하여 재봉부를 형성할 수 있다.The sealing step (S20) may heat seal the outer circumferential surface of the case to form a sealing part, and the sewing step (S30) may sew along the sealing part to form a sewing part.
한편, 상기 실링단계(S20)는 상기 케이스의 외주면에서 가장자리를 제외한 부분을 열 융착하여 실링부를 형성하고, 상기 재봉단계(S30)는 상기 케이스의 외주면에서 가장자리를 재봉하여 재봉부를 형성할 수 있다.On the other hand, the sealing step (S20) may form a sealing portion by heat-sealing the portion except the edge on the outer peripheral surface of the case, the sewing step (S30) may form a sewing portion by sewing the edge on the outer peripheral surface of the case.
상기 재봉단계(S30)는 상기 수용부의 외주면을 재봉실로 재봉하여 형성될 수 있다.The sewing step (S30) may be formed by sewing the outer peripheral surface of the receiving portion with a sewing thread.
상기 재봉실은 내측 재봉물질과 외측 재봉물질로 형성될 수 있다.The sewing thread may be formed of an inner sewing material and an outer sewing material.
상기 외측 재봉물질은 열에 의해 용융되는 합성수지로 형성될 수 있다.The outer sewing material may be formed of a synthetic resin that is melted by heat.
상기 내측 재봉물질은 상기 외측 재봉물질 보다 높은 용융점과 강도를 가질 수 있다.The inner sewing material may have a higher melting point and strength than the outer sewing material.
상기 재봉단계(S30) 후, 상기 재봉부가 형성된 상기 케이스의 외주면을 열 융착하는 열 융착단계(S40)를 더 포함하며, 상기 열 융착 단계(S40)는 상기 재봉부를 형성한 재봉실의 외측 재봉물질을 용융시켜서 상기 재봉실과 상기 케이스 사이의 틈새를 밀봉할 수 있다.After the sewing step (S30), further comprises a thermal fusion step (S40) for thermally fusion bonding the outer circumferential surface of the case in which the sewing unit is formed, the thermal fusion step (S40) is the outer sewing material of the sewing thread formed the sewing unit Melting may seal the gap between the sewing thread and the case.
상기 준비단계(S10)는 제1 전극, 분리막 및 제2 전극이 교대로 적층한 다음, 상기 제1 전극의 제1 전극탭에 제1 전극리드를 결합하고, 상기 제2 전극의 제2 전극탭에 제2 전극리드를 결합하여 전극 조립체를 제조할 수 있다.In the preparing step (S10), the first electrode, the separator and the second electrode are alternately stacked, and then a first electrode lead is coupled to the first electrode tab of the first electrode, and the second electrode tab of the second electrode is combined. The electrode assembly may be manufactured by bonding a second electrode lead to the second electrode lead.
상기 제1 전극리드와 상기 제2 전극리드는 서로 반대방향을 향하도록 상기 전극 조립체의 양 단부에 각각 결합되고, 상기 케이스 밖으로 인출될 수 있다.The first electrode lead and the second electrode lead may be coupled to both ends of the electrode assembly so as to face in opposite directions, respectively, and may be drawn out of the case.
상기 재봉단계(S30)는 상기 제1 전극리드와 상기 제2 전극리드가 위치한 상기 케이스의 외주면을 제외한 부분을 재봉하여 재봉부를 형성할 수 있다.The sewing step (S30) may form a sewing unit by sewing a portion except the outer peripheral surface of the case in which the first electrode lead and the second electrode lead is located.
상기와 같은 구성을 통해 본 발명은 하기와 같은 효과가 있다.Through the above configuration, the present invention has the following effects.
첫째: 전극 조립체가 수용되는 케이스의 외주면에 실링부와 재봉부를 형성함으로서 케이스의 실링력을 높일 수 있고, 특히 벤팅을 효과적으로 방지할 수 있다.First: by forming a sealing part and a sewing part on the outer circumferential surface of the case in which the electrode assembly is accommodated, it is possible to increase the sealing force of the case, and in particular, to prevent the venting.
둘째: 케이스의 외주면에 형성되는 실링부와 실링부은 겹쳐지게 형성하거나 또는 겹쳐지지 않게 각각 형성함으로써 케이스의 실링력을 높일 수 있고, 특히 벤팅을 효과적으로 방지할 수 있다.Second: The sealing portion and the sealing portion formed on the outer circumferential surface of the case can be formed to overlap or not overlap each other to increase the sealing force of the case, in particular it can effectively prevent the venting.
셋째: 실링부는 케이스의 외주면을 열 융착하여 형성함으로써 케이스 외주면의 실링력을 높일 수 있다.Third: The sealing portion can be formed by heat-sealing the outer peripheral surface of the case to increase the sealing force of the outer peripheral surface of the case.
넷째: 재봉부는 케이스의 외주면을 재봉실로 재봉하여 형성함으로써 케이스 외주면의 결합력을 높일 수 있어 벤팅을 효과적으로 방지할 수 있다.Fourth: the sewing unit is formed by sewing the outer peripheral surface of the case with a sewing thread can increase the bonding force of the outer peripheral surface of the case can effectively prevent the venting.
다섯째: 재봉실은 이중구조로 형성하되, 외측 재봉물질은 열에 의해 용융되는 합성수지로 마련함으로써 상기 외측 재봉물질의 용융을 통해 재봉실이 통과하는 케이스의 외주면에 형성되는 구멍을 밀봉할 수 있다.Fifth: The sewing thread is formed in a double structure, the outer sewing material is provided with a synthetic resin that is melted by heat to seal the hole formed in the outer peripheral surface of the case through which the sewing thread passes through the melting of the outer sewing material.
여섯째: 재봉실은 이중구조로 형성하되, 내측 재봉물질은 외측 재봉물질 보다 높은 용융점과 강도를 가지도록 마련함으로써 외측 재봉물질의 용융시 내측 재봉물질이 용융되는 것을 방지하며, 이에 케이스의 재봉력을 높일 수 있다.Sixth: The sewing thread is formed in a double structure, the inner sewing material is provided to have a higher melting point and strength than the outer sewing material to prevent the inner sewing material is melted during the melting of the outer sewing material, thereby increasing the sewing force of the case Can be.
일곱째: 재봉부는 전극조립체에 결합된 전극리드가 위치한 케이스의 외주면을 제외한 부분을 재봉하며, 이에 전극리드의 강도에 의한 재봉불량을 사전에 방지할 수 있다.Seventh: The sewing unit sews a portion other than the outer circumferential surface of the case in which the electrode lead coupled to the electrode assembly is located, thereby preventing the sewing failure due to the strength of the electrode lead in advance.
도 1은 본 발명의 제1 실시예에 따른 이차전지를 도시한 사시도.1 is a perspective view illustrating a rechargeable battery according to a first exemplary embodiment of the present invention.
도 2는 도 1에 표시된 A-A선 단면도.2 is a cross-sectional view taken along the line A-A shown in FIG.
도 3은 도 1에 표시된 B-B선 확대 단면도.3 is an enlarged cross-sectional view taken along the line B-B shown in FIG.
도 4는 본 발명의 제1 실시예에 따른 이차전지의 전극조립체를 도시한 사시도.4 is a perspective view illustrating an electrode assembly of a secondary battery according to a first embodiment of the present invention.
도 5는 본 발명의 제1 실시예에 따른 이차전지의 재봉실을 도시한 사시도.5 is a perspective view illustrating a sewing thread of a secondary battery according to a first embodiment of the present invention;
도 6은 도 5의 단면도.6 is a cross-sectional view of FIG.
도 7a 내지 도 7f는 재봉부를 형성하는 바느질 종류를 나타낸 도면.7A to 7F are diagrams illustrating the types of stitches that form a sewing unit.
도 8은 본 발명의 제1 실시예에 따른 이차전지 제조방법을 나타낸 순서도.8 is a flow chart showing a secondary battery manufacturing method according to a first embodiment of the present invention.
도 9는 본 발명의 제1 실시예에 따른 이차전지 제조방법에서 전극조립체 준비단계를 나타낸 도면.9 is a view showing an electrode assembly preparation step in a secondary battery manufacturing method according to a first embodiment of the present invention.
도 10은 본 발명의 제1 실시예에 따른 이차전지의 제조방법에서 케이스 실링단계를 나타낸 도면.10 is a view showing a case sealing step in the method of manufacturing a secondary battery according to a first embodiment of the present invention.
도 11은 본 발명의 제1 실시예에 따른 이차전지의 제조방법에서 케이스 재봉단계를 나타낸 도면.11 is a view showing a case sewing step in the method of manufacturing a secondary battery according to a first embodiment of the present invention.
도 12는 본 발명의 제1 실시예에 따른 이차전지의 제조방법에서 재봉부 열융착단계를 나타낸 도면.12 is a view showing a sewing unit heat fusion step in the method of manufacturing a secondary battery according to the first embodiment of the present invention.
도 13은 도 12에 표시된 C-C선 단면도.FIG. 13 is a cross-sectional view taken along the line C-C shown in FIG. 12. FIG.
도 14는 본 발명의 제2 실시예에 따른 이차전지를 도시한 사시도.14 is a perspective view illustrating a rechargeable battery according to a second exemplary embodiment of the present invention.
도 15는 본 발명의 제2 실시예에 따른 이차전지 제조방법을 나타낸 순서도.15 is a flowchart illustrating a method of manufacturing a secondary battery according to a second embodiment of the present invention.
도 16은 본 발명의 제2 실시예에 따른 이차전지의 제조방법에서 케이스 실링단계를 나타낸 도면.16 is a view illustrating a case sealing step in the method of manufacturing a secondary battery according to a second embodiment of the present invention.
도 17은 본 발명의 제2 실시예에 따른 이차전지의 제조방법에서 케이스 재봉단계를 나타낸 도면.17 is a view showing a case sewing step in the method of manufacturing a secondary battery according to a second embodiment of the present invention.
도 18은 본 발명의 제2 실시예에 따른 이차전지의 제조방법에서 재봉부 열융착단계를 나타낸 도면.18 is a view showing a sewing unit heat fusion step in the method of manufacturing a secondary battery according to a second embodiment of the present invention.
이하, 첨부한 도면을 참조하여 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 본 발명의 일 실시예를 상세히 설명한다. 그러나 본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다. 그리고 도면에서 본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 유사한 부분에 대해서는 유사한 도면 부호를 붙였다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.
[제1 실시예에 따른 이차전지][Secondary Battery According to First Embodiment]
본 발명의 제1 실시예에 따른 이차전지(100)는 도 1에 도시되어 있는 것과 같이, 전극 조립체(110), 및 전극 조립체(110)가 수용되는 케이스(120)를 포함한다.The secondary battery 100 according to the first embodiment of the present invention, as shown in FIG. 1, includes an electrode assembly 110 and a case 120 in which the electrode assembly 110 is accommodated.
전극조립체Electrode Assembly
전극조립체(110)는 도 4를 참조하면, 서로 다른 극성을 가진 복수의 전극과 복수의 분리막이 교대로 적층되는 구조를 가진다. 여기서 복수의 전극은 제1 전극과 제2 전극이고, 복수의 분리막은 제1 분리막 및 제2 분리막일 수 있다. 즉, 전극조립체(110)는 제1 전극, 제1 분리막, 제2 전극 및 제2 분리막이 교대로 적층되는 구조를 가질 수 있다.Referring to FIG. 4, the electrode assembly 110 has a structure in which a plurality of electrodes having a different polarity and a plurality of separators are alternately stacked. The plurality of electrodes may be a first electrode and a second electrode, and the plurality of separators may be a first separator and a second separator. That is, the electrode assembly 110 may have a structure in which the first electrode, the first separator, the second electrode, and the second separator are alternately stacked.
한편, 제1 전극에는 제1 전극탭이 형성되고, 제2 전극에는 제2 전극탭이 형성된다. 그리고 제1 전극탭에는 제1 전극리드(111)가 결합되고, 제2 전극탭에는 제2 전극리드(112)가 결합된다. The first electrode tab is formed on the first electrode, and the second electrode tab is formed on the second electrode. The first electrode lead 111 is coupled to the first electrode tab, and the second electrode lead 112 is coupled to the second electrode tab.
이때 제1 전극리드(111)과 제2 전극리드(112)는 케이스(120) 밖으로 인출되는데, 서로 반대방향을 향하도록 전극조립체(110)의 양 단부에 각각 결합된다. 즉, 본 발명은 케이스(120)의 외주면에 재봉부를 형성하는 것으로, 제1 전극리드(111)와 제2 전극리드(112)가 같은 방향을 향한 상태로 전극조립체(110)의 일단에 각각 결합될 경우 제1 전극리드(111)와 제2 전극리드(112) 사이의 케이스(120) 외주면에 재봉부를 형성하는데 어려움이 있으며, 재봉부를 형성하더라도 재봉력이 약해 벤팅이 방지할 수 있다. 이에, 본 발명은 제1 전극리드(111)과 제2 전극리드(112)가 서로 반대방향을 향하는 이차전지에 적용할 경우 최고의 효율성을 얻을 수 있다.In this case, the first electrode lead 111 and the second electrode lead 112 are drawn out of the case 120, and are coupled to both ends of the electrode assembly 110 to face in opposite directions. That is, the present invention forms a sewing part on the outer circumferential surface of the case 120, and is coupled to one end of the electrode assembly 110 in a state in which the first electrode lead 111 and the second electrode lead 112 face in the same direction. If there is a difficulty in forming a sewing part on the outer peripheral surface of the case 120 between the first electrode lead 111 and the second electrode lead 112, even if the sewing part is formed, the sewing force is weak, and venting can be prevented. Thus, the present invention can obtain the highest efficiency when the first electrode lead 111 and the second electrode lead 112 is applied to the secondary battery facing the opposite direction.
케이스case
케이스(120)는 도 2를 참조하면, 전극조립체(110)를 사이에 두고 상부 케이스와 하부케이스가 상호 결합되면서 형성되는 것으로, 전극조립체(110)가 수용되는 수용부(121)와, 수용부(121)의 외주면에 형성되는 실링부(122)를 포함한다.Referring to FIG. 2, the case 120 is formed by coupling the upper case and the lower case with the electrode assembly 110 interposed therebetween, the receiving portion 121 in which the electrode assembly 110 is accommodated, and the receiving portion. It includes a sealing portion 122 formed on the outer peripheral surface of (121).
즉, 케이스(120)는 수용부(121)에 전극조립체(110)를 수용한 다음, 외주면에 실링부(122)를 형성하여 수용부(121)를 밀봉한다.That is, the case 120 receives the electrode assembly 110 in the accommodating part 121, and then seals the accommodating part 121 by forming a sealing part 122 on an outer circumferential surface thereof.
여기서 케이스(120)의 외주면에는 재봉부(130)가 더 형성되며, 재봉부(130)는 케이스(120) 외주면의 결합력을 높이고, 벤팅(venting)을 효과적으로 방지하여 안전성을 높일 수 있다.In this case, the outer circumferential surface of the case 120 is further formed with a sewing unit 130, and the sewing unit 130 may increase the coupling force of the outer circumferential surface of the case 120 and effectively prevent venting to increase safety.
즉, 전극조립체(110)의 과충전시 케이스(120)의 내부 압력이 상승하면서 팽창하게 되는데, 이때 케이스(120)의 내부 압력에 의해 실링부(122)가 벌어지면서 벤팅이 발생하는 문제가 있었다. That is, when the internal pressure of the case 120 is increased when the electrode assembly 110 is overcharged, the internal pressure of the case 120 is expanded, and there is a problem that the venting occurs while the sealing part 122 is opened by the internal pressure of the case 120.
이를 방지하기 위해 본 발명의 제1 실시예에 따른 이차전지(100)는 도 1에 도시되어 있는 것과 같이, 케이스(120)의 외주면에 실링부(122)와 함께 재봉부(130)를 더 형성하며, 이 재봉부(130)는 케이스(120) 외주면의 결합력을 향상시킴에 따라 케이스(120)의 내부 압력이 상승하더라도 실링부(122)가 벌어지는 것을 방지하고, 벤팅(venting)을 효과적으로 방지하여 안전성을 높일 수 있다.In order to prevent this, the secondary battery 100 according to the first embodiment of the present invention further includes a sewing unit 130 together with the sealing unit 122 on the outer circumferential surface of the case 120 as shown in FIG. 1. The sewing unit 130 improves the coupling force of the outer circumferential surface of the case 120, thereby preventing the sealing unit 122 from opening even when the internal pressure of the case 120 increases, thereby effectively preventing venting. It can increase safety.
이하, 재봉부를 보다 상세히 설명한다.Hereinafter, the sewing unit will be described in more detail.
재봉부Sewing
재봉부(130)는 도 3을 참조하면, 케이스(120)의 외주면에 실링부(122)와 함께 형성될 수 있다. 특히 케이스(120)의 외주면에는 실링부(122)와 재봉부(130)가 겹쳐지게 형성될 수 있다. 즉, 실링부(122)는 수용부(121)의 외주면을 열 융착하여 형성되고, 재봉부(130)는 실링부(122)를 따라 형성된다.Referring to FIG. 3, the sewing unit 130 may be formed together with the sealing unit 122 on the outer circumferential surface of the case 120. In particular, the outer peripheral surface of the case 120 may be formed so that the sealing portion 122 and the sewing unit 130 overlap. That is, the sealing part 122 is formed by heat-sealing the outer circumferential surface of the accommodating part 121, and the sewing part 130 is formed along the sealing part 122.
이와 같이 케이스(120)의 외주면에 실링부(122)와 재봉부(130)를 겹쳐지게 형성함으로써 케이스(120)의 외주면 공간이 협소하더라도 작업이 가능하고, 특히 실링부(122) 및 재봉부(130)의 면적을 최대한 확보할 수 있어 실링력과 결합력을 높일 수 있다.As such, the sealing part 122 and the sewing part 130 are overlapped on the outer circumferential surface of the case 120 so that the work is possible even if the space of the outer circumferential surface of the case 120 is narrow, in particular, the sealing part 122 and the sewing part ( The area of 130) can be secured as much as possible to increase the sealing force and bonding force.
한편, 재봉부(130)는 수용부(121)의 외주면을 재봉실(131)로 재봉하여 형성될 수 있다. 즉, 도 3을 참조하면, 재봉실(131)을 실링부(122)의 상면과 하면을 지그재그로 통과시켜서 재봉부(130)를 형성하며, 이에 실링부(122)의 결합력을 높일 수 있다. 여기서 재봉실(131)은 재봉하는 방법에 따라 다양한 형태와 구조로 재봉부(130)를 형성할 수도 있고, 2개 이상의 재봉실(131)을 사용하여 2개 이상의 재봉부(130)를 형성할 수도 있다.Meanwhile, the sewing unit 130 may be formed by sewing the outer circumferential surface of the accommodation unit 121 with the sewing thread 131. That is, referring to FIG. 3, the sewing thread 131 is passed through the upper and lower surfaces of the sealing portion 122 in a zigzag to form the sewing portion 130, thereby increasing the coupling force of the sealing portion 122. Here, the sewing thread 131 may form the sewing part 130 in various shapes and structures according to a method of sewing, or may form two or more sewing parts 130 using two or more sewing threads 131. .
한편, 재봉부(130)는 제1 전극리드(111)와 제2 전극리드(112)가 위치한 수용부(121)의 외주면 부분을 제외한 부분에 형성될 수 있다. 즉, 제1 전극리드(111)와 제2 전극리드(112)는 강도를 가진 재질로 마련되기 때문에 재봉이 불가능하며, 재봉을 하더라도 특수 재봉장치가 필요하기 때문에 제1 전극리드(111)와 제2 전극리드(112)가 위치한 수용부(121)의 외주면 부분을 제외한 부분에 형성하여 작업성을 높일 수 있다. Meanwhile, the sewing unit 130 may be formed at portions other than the outer circumferential surface portions of the accommodation unit 121 in which the first electrode lead 111 and the second electrode lead 112 are located. That is, since the first electrode lead 111 and the second electrode lead 112 are made of a material having strength, sewing is impossible, and even when sewing, the first electrode lead 111 and the first electrode lead 111 are required. The workability may be improved by forming the portion except the outer circumferential surface portion of the accommodating part 121 where the two electrode leads 112 are located.
한편, 재봉실(131)이 재봉된 케이스(120)의 외주면에는 구멍이 형성되며, 이 구멍에 의해 실링부(122)의 실링력이 감소되는 문제가 있다. 이와 같은 문제를 방지하기 위해 재봉실(131)과 케이스(120) 외주면에 형성된 구멍 사이의 틈새를 밀봉하고, 이에 실링부(122)의 실링력을 높일 수 있다.On the other hand, a hole is formed in the outer circumferential surface of the case 120 in which the sewing thread 131 is sewn, and the sealing force of the sealing part 122 is reduced by this hole. In order to prevent such a problem, the gap between the hole formed in the outer circumferential surface of the sewing thread 131 and the case 120 may be sealed, thereby increasing the sealing force of the sealing part 122.
일례로, 재봉실(131)은 도 5 및 도 6에 도시되어 있는 것과 같이, 이중 구조, 즉 내측 재봉물질(131a)과 외측 재봉물질(131b)로 형성될 수 있으며, 이 중 외측 재봉물질(131b)은 열에 의해 용융되는 합성수지로 형성된다. 즉, 외측 재봉물질(131b)을 용융시켜서 재봉실(131)과 케이스(120) 외주면에 형성된 구멍 사이를 밀봉할 수 있다.For example, the sewing thread 131 may be formed of a double structure, that is, an inner sewing material 131a and an outer sewing material 131b, as shown in FIGS. 5 and 6, and an outer sewing material 131b. ) Is formed of a synthetic resin that is melted by heat. That is, the outer sewing material 131b may be melted to seal the hole formed in the outer circumferential surface of the sewing thread 131 and the case 120.
보다 상세히 설명하면, 재봉부(130)가 형성된 케이스(120)의 외주면에 열 융착할 시 재봉실(131)의 외측 재봉물질(131b)이 용융되면서 재봉실(131)과 케이스(120) 외주면에 형성된 구멍 사이의 틈새를 밀봉하며, 이에 실링부(122)의 실링력을 높일 수 있다.More specifically, the hole formed in the outer circumferential surface of the sewing thread 131 and the case 120 while the outer sewing material 131b of the sewing thread 131 is melted when heat-sealed to the outer circumferential surface of the case 120 in which the sewing unit 130 is formed. Sealing the gap between, thereby increasing the sealing force of the sealing portion 122.
여기서 내측 재봉물질(131a)은 외측 재봉물질(131b) 보다 높은 용융점과 강도를 가지며, 이에 내측 재봉물질(131a)의 용융을 방지하고, 높은 강도를 통해 실링부(122)의 결합성을 높일 수 있다.Here, the inner sewing material 131a has a higher melting point and strength than the outer sewing material 131b, thereby preventing the melting of the inner sewing material 131a and increasing the bondability of the sealing part 122 through high strength. have.
한편, 내측 재봉물질(131a)은 유연성을 가지는 재질로 마련될 수 있으며, 특히 금속, 고분자 물질 및 직물 중 어느 하나일 수 있다.On the other hand, the inner sewing material 131a may be provided with a material having flexibility, and in particular, may be any one of a metal, a polymer material, and a fabric.
이와 같이 재봉부(130)는 실링부(122)의 결합력을 높일 수 있으며, 이에 케이스(120)의 내부 압력에 의해 실링부(122)가 벤팅되는 문제를 해결할 수 있다.In this way, the sewing unit 130 may increase the coupling force of the sealing unit 122, thereby solving the problem that the sealing unit 122 is bent by the internal pressure of the case 120.
한편 재봉실(131)은 수용부(121)의 외주면에 새발뜨기(herringbone stitch, 도 7a 및 도 7b 참조), 박음질(back stitch, 도 7c 및 도 7d 참조), 및 감침질(hemming sitch, 도 7e 및 도 7f 참조) 중 어느 하나의 바느질로 재봉될 수 있다. 즉, 수용부(121)의 외주면에는 다양한 방법의 바느질로 재봉부(130)를 형성할 수 있다.Meanwhile, the sewing thread 131 is formed on the outer circumferential surface of the accommodating part 121 (herringbone stitch, see FIGS. 7A and 7B), stitching (back stitch, see FIGS. 7C and 7D), and hemming sitch (FIGS. 7E and 7E). 7F) may be sewn by sewing. That is, the sewing unit 130 may be formed on the outer circumferential surface of the accommodation unit 121 by sewing in various ways.
따라서 본 발명의 제1 실시예에 따른 이차전지는 케이스(120)의 외주면에 실링부(122)와 재봉부(130)를 포함함으로써 안전성을 높일 수 있다.Therefore, the secondary battery according to the first embodiment of the present invention may increase safety by including the sealing part 122 and the sewing part 130 on the outer circumferential surface of the case 120.
이하, 상기와 같은 구성을 가지는 본 발명의 제1 실시예에 따른 이차전지의 제조방법을 설명하면 다음과 같다.Hereinafter, the manufacturing method of the secondary battery according to the first embodiment of the present invention having the configuration as described above is as follows.
[제1 실시예에 따른 이차전지 제조방법][Secondary Battery Manufacturing Method According to First Embodiment]
본 발명의 제1 실시예에 따른 이차전지 제조방법은 도 8에 도시되어 있는 것과 같이, 전극 조립체(110)를 준비하는 준비단계(S10), 전극 조립체(110)를 케이스(120)의 수용부(121)에 수용한 다음, 케이스(110)의 외주면을 실링하여 실링부(122)를 형성하는 실링단계(S20), 및 케이스(120)의 외주면에 재봉부(130)를 형성하는 재봉단계(S30)를 포함한다.In the secondary battery manufacturing method according to the first exemplary embodiment of the present invention, as shown in FIG. 8, a preparation step (S10) of preparing the electrode assembly 110 and an electrode assembly 110 of the housing 120 of the case 120. After receiving in the 121, the sealing step (S20) to form a sealing portion 122 by sealing the outer peripheral surface of the case 110, and the sewing step of forming a sewing unit 130 on the outer peripheral surface of the case 120 ( S30).
준비단계Preparation
준비단계(S10)는 도 9에 도시되어 있는 것과 같이, 양쪽 방향으로 제1 전극리드(111)와 제2 전극리드(112)가 결합된 전극조립체(110)를 준비한다. 즉, 준비단계(S10)는 제1 전극, 분리막 및 제2 전극이 교대로 적층한 다음, 상기 제1 전극의 제1 전극탭에 제1 전극리드(111)를 결합하고, 상기 제2 전극의 제2 전극탭에 제2 전극리드(112)를 결합하여 전극 조립체(110)를 준비한다.As shown in FIG. 9, the preparation step S10 prepares the electrode assembly 110 in which the first electrode lead 111 and the second electrode lead 112 are coupled in both directions. That is, in the preparation step S10, after the first electrode, the separator, and the second electrode are alternately stacked, the first electrode lead 111 is coupled to the first electrode tab of the first electrode, and the second electrode The electrode assembly 110 is prepared by bonding the second electrode lead 112 to the second electrode tab.
이때 제1 전극리드(111)와 제2 전극리드(112)는 서로 반대방향을 향하도록 전극조립체(110)의 양 단부에 각각 결합된다.In this case, the first electrode lead 111 and the second electrode lead 112 are respectively coupled to both ends of the electrode assembly 110 to face in opposite directions.
실링단계Sealing stage
실링단계(S20)는 도 10에 도시되어 있는 것과 같이, 전극조립체(110)를 케이스(120)의 수용부(121)에 수용한다. 이때 제1 전극리드(111)의 선단과 제2 전극리드(112)의 선단은 케이스(120)의 밖으로 인출되게 위치한다.In the sealing step S20, as shown in FIG. 10, the electrode assembly 110 is accommodated in the accommodating part 121 of the case 120. At this time, the tip of the first electrode lead 111 and the tip of the second electrode lead 112 are positioned to be drawn out of the case 120.
그리고 전극조립체(110)를 케이스(120)에 수용한 다음, 케이스(120)의 외주면을 열융착하여 실링부(122)를 형성한다.The electrode assembly 110 is accommodated in the case 120, and then the outer circumferential surface of the case 120 is heat-sealed to form a sealing portion 122.
재봉단계Sewing stage
재봉단계(S30)는 도 11에 도시되어 있는 것과 같이, 케이스(120)의 실링부(122)를 따라 재봉실(131)로 재봉하여 재봉부(130)를 형성하며, 재봉부(130)는 실링부(122)의 결합력을 높인다. 한편 재봉실(131)은 내측 재봉물질(131a)과 외측 재봉물질(131b)로 마련되며, 외측 재봉물질(131b)은 열에 의해 용융되는 합성수지로 마련된다. 그리고 내측 재봉물질(131a)은 외측 재봉물질(131b) 보다 높은 용융점과 강도를 가진다.As shown in FIG. 11, the sewing step S30 is sewn with the sewing thread 131 along the sealing part 122 of the case 120 to form the sewing part 130, and the sewing part 130 is sealed. The bonding force of the part 122 is increased. Meanwhile, the sewing thread 131 is provided with the inner sewing material 131a and the outer sewing material 131b, and the outer sewing material 131b is made of a synthetic resin melted by heat. The inner sewing material 131a has a higher melting point and strength than the outer sewing material 131b.
한편, 재봉단계(S30)는 제1 전극리드(111)와 제2 전극리드(112)가 위치한 케이스(120)의 외주면을 제외한 부분을 재봉하여 재봉부(130)를 형성한다. 즉 제1 전극리드(111)와 제2 전극리드(112)를 함께 재봉하기는 어렵기 때문에 제1 전극리드(111)와 제2 전극리드(112)가 있는 케이스(120)의 외주면을 제외한 상태로 재봉부(130)를 형성하여 작업성을 높인다.Meanwhile, in the sewing step S30, the sewing unit 130 is formed by sewing portions except the outer circumferential surface of the case 120 in which the first electrode lead 111 and the second electrode lead 112 are located. That is, since it is difficult to sew the first electrode lead 111 and the second electrode lead 112 together, the state except the outer circumferential surface of the case 120 having the first electrode lead 111 and the second electrode lead 112 is excluded. By forming the sewing unit 130 to increase the workability.
이와 같은 단계가 완료되면, 재봉부(130)가 형성된 케이스(120)의 외주면을 열융착하는 열융착단계(S40)를 더 수행한다.When such a step is completed, a heat fusion step (S40) of performing heat fusion on the outer circumferential surface of the case 120 in which the sewing unit 130 is formed is further performed.
열융착단계Heat Fusion Step
열융착단계(S40)는 도 12 및 도 13에 도시되어 있는 것과 같이, 재봉부(130)가 형성된 케이스(120)의 외주면을 열융착장치로 열융착한다. 그러면 재봉부(130)를 형성한 재봉실(131)의 외측 재봉물질(131b)이 용융되면서 재봉실(131)에 의해 형성되는 케이스(120)의 구멍에 유입되며, 이에 케이스(120)에 형성된 구멍을 밀봉한다. 즉, 재봉부(130)와 케이스(120) 사이의 틈새를 밀봉할 수 있다.In the heat fusion step (S40) as shown in Figure 12 and 13, the outer circumferential surface of the case 120, the sewing unit 130 is formed by the heat fusion apparatus. Then, the outer sewing material 131b of the sewing thread 131 forming the sewing unit 130 is melted and flows into the hole of the case 120 formed by the sewing thread 131, thereby forming a hole formed in the case 120. Seal. That is, the gap between the sewing unit 130 and the case 120 may be sealed.
이와 같이 열융착단계(S40)가 완료되면, 실링부(122)와 재봉부(130)가 형성된 제1 실시예에 따른 이차전지(100)를 완성할 수 있다.As such, when the thermal fusion step S40 is completed, the secondary battery 100 according to the first embodiment in which the sealing unit 122 and the sewing unit 130 are formed may be completed.
이하, 본 발명의 다른 실시예를 설명함에 있어 전술한 제1 실시예와 동일한 구성과 기능을 가지는 구성에 대해서는 동일한 구성부호를 사용하며, 중복되는 설명은 생략한다.Hereinafter, in describing other embodiments of the present invention, components having the same configuration and function as those of the above-described first embodiment will be denoted by the same reference numerals, and redundant descriptions thereof will be omitted.
[제2 실시예에 따른 이차전지][Secondary Battery According to Second Embodiment]
본 발명의 제2 실시예에 따른 이차전지(100')는 도 14에 도시되어 있는 것과 같이, 전극 조립체(110), 및 전극 조립체(110)가 수용되는 케이스(120)를 포함하며, 케이스(120)는 전극 조립체(110)가 수용되는 수용부(121)와, 수용부(121)의 외주면에 형성되는 실링부(122) 및 재봉부(130)를 포함한다.As illustrated in FIG. 14, the secondary battery 100 ′ according to the second embodiment of the present invention includes an electrode assembly 110 and a case 120 in which the electrode assembly 110 is accommodated. 120 includes a receiving part 121 in which the electrode assembly 110 is accommodated, a sealing part 122 and a sewing part 130 formed on an outer circumferential surface of the receiving part 121.
여기서 본 발명의 제2 실시예에 따른 이차전지(100')는 상기 수용부의 외주면에 실링부(122)와 재봉부(130)가 서로 겹치지 않게 각각 형성될 수 있으며, 이에 재봉부(130)와 실링부(220)가 겹쳐지면서 발생하는 실링력 약화를 방지할 수 있다.Here, the secondary battery 100 ′ according to the second embodiment of the present invention may be formed on the outer circumferential surface of the accommodating part so that the sealing part 122 and the sewing part 130 do not overlap each other, and thus the sewing part 130 and It is possible to prevent the sealing force from being weakened when the sealing unit 220 overlaps.
일례로, 실링부(122)는 수용부(121)의 외주면에서 가장자리를 제외한 부분을 열 융착함에 따라 형성되고, 재봉부(130)는 수용부(121)의 외주면에서 가장자리에 재봉실(131)로 재봉하여 형성된다.For example, the sealing part 122 is formed by thermally fusion a portion excluding the edge from the outer circumferential surface of the accommodating part 121, and the sewing part 130 is a sewing thread 131 at the edge of the outer circumferential surface of the accommodating part 121. It is formed by sewing.
따라서 본 발명의 제2 실시예에 따른 이차전지(100)는 케이스(120)의 외주면에 실링부(122)와 재봉부(130)가 형성함으로써 실링부(122)를 통한 실링력 향상과, 재봉부(130)를 통한 실링부(122) 결합력 향상을 동시에 얻을 수 있다.Therefore, in the secondary battery 100 according to the second embodiment of the present invention, the sealing portion 122 and the sewing portion 130 are formed on the outer circumferential surface of the case 120 to improve the sealing force through the sealing portion 122, and sewing It is possible to simultaneously improve the coupling force of the sealing part 122 through the part 130.
이하, 본 발명의 제2 실시예에 따른 이차전지의 제조방법을 설명한다.Hereinafter, a method of manufacturing a secondary battery according to a second embodiment of the present invention will be described.
[제2 실시예에 따른 이차전지 제조방법][Secondary Battery Manufacturing Method According to Second Embodiment]
본 발명의 제2 실시예에 따른 이차전지 제조방법은 도 15에 도시되어 있는 것과 같이, 전극 조립체(110)를 준비하는 준비단계(S10), 전극 조립체(110)를 케이스(120)의 수용부(121)에 수용한 다음, 케이스(110)의 외주면에서 가장자리를 제외한 부분을 실링하여 실링부(122)를 형성하는 실링단계(S21), 및 케이스(120)의 외주면에서 가장자리에 재봉부(130)를 형성하는 재봉단계(S31)를 포함한다.In the secondary battery manufacturing method according to the second exemplary embodiment of the present invention, as shown in FIG. 15, a preparation step (S10) of preparing an electrode assembly 110 and an electrode assembly 110 of an accommodating part of a case 120 are provided. After receiving in the 121, the sealing step (S21) to form a sealing portion 122 by sealing the portion except the edge on the outer peripheral surface of the case 110, and the sewing portion 130 on the edge on the outer peripheral surface of the case 120 It includes a sewing step (S31) to form a).
준비단계Preparation
준비단계(S10)는 양쪽 방향으로 제1 전극리드(111)와 제2 전극리드(112)가 결합된 전극조립체(110)를 준비한다. 한편, 준비단계(S10)는 앞서 설명한 제1 실시예에 따른 이차전지 제조방법의 준비단계와 동일하기에 자세한 설명은 생략한다.The preparation step S10 prepares the electrode assembly 110 in which the first electrode lead 111 and the second electrode lead 112 are combined in both directions. On the other hand, the preparation step (S10) is the same as the preparation step of the secondary battery manufacturing method according to the first embodiment described above, detailed description thereof will be omitted.
실링단계Sealing stage
실링단계(S21)는 도 16에 도시되어 있는 것과 같이, 전극조립체(110)를 케이스(120)의 수용부(121)에 수용한다. 이때 제1 전극리드(111)의 선단과 제2 전극리드(112)의 선단은 케이스(120)의 밖으로 인출되게 위치한다.In the sealing step S21, as shown in FIG. 16, the electrode assembly 110 is accommodated in the accommodating part 121 of the case 120. At this time, the tip of the first electrode lead 111 and the tip of the second electrode lead 112 are positioned to be drawn out of the case 120.
전극조립체(110)를 케이스(120)에 수용한 다음, 케이스(120)의 외주면 중 가장자리를 제외한 부분을 열융착하여 실링부(122)를 형성한다.The electrode assembly 110 is accommodated in the case 120, and then a portion of the outer circumferential surface of the case 120 except for the edge is heat-sealed to form a sealing portion 122.
재봉단계Sewing stage
재봉단계(S31)는 도 17에 도시되어 있는 것과 같이, 케이스(120)의 가장자리를 따라 재봉실(131)로 재봉하여 재봉부(130)를 형성한다. 여기서 재봉실(131)은 앞서 설명한 제1 실시예에 따른 이차전지 제조방법의 재봉실과 동일한 구성을 가지기에 자세한 설명은 생략한다.As shown in FIG. 17, the sewing step S31 is sewn with the sewing thread 131 along the edge of the case 120 to form the sewing unit 130. Here, the sewing thread 131 has the same configuration as the sewing thread of the secondary battery manufacturing method according to the first embodiment described above, and thus a detailed description thereof will be omitted.
즉, 실링부(122)가 형성되지 않은 케이스(120)의 외주면을 재봉실(131)로 재봉하여 재봉부(130)를 형성한다.That is, the outer circumferential surface of the case 120 in which the sealing part 122 is not formed is sewn with the sewing thread 131 to form the sewing part 130.
이와 같은 단계가 완료되면, 재봉부(130)가 형성된 케이스(120)의 외주면을 열융착하는 열융착단계(S41)를 더 수행한다.When such a step is completed, a heat fusion step (S41) for further heat-sealing the outer peripheral surface of the case 120, the sewing unit 130 is formed.
열융착단계Heat Fusion Step
열융착단계(S41)는 도 18에 도시되어 있는 것과 같이, 재봉부(130)가 형성된 케이스(120)의 외주면을 열융착한다. 그러면 재봉부(130)를 형성한 재봉실(131)의 외측 재봉물질(131b)이 용융되면서 재봉실(131)에 의해 형성되는 케이스(120)의 구멍에 유입되며, 이에 케이스(120)에 형성된 구멍을 밀봉한다. 즉, 재봉부(130)와 케이스(120) 사이의 틈새를 밀봉할 수 있다.In the heat fusion step S41, as illustrated in FIG. 18, the outer circumferential surface of the case 120 in which the sewing unit 130 is formed is heat-sealed. Then, the outer sewing material 131b of the sewing thread 131 forming the sewing unit 130 is melted and flows into the hole of the case 120 formed by the sewing thread 131, thereby forming a hole in the case 120. Seal. That is, the gap between the sewing unit 130 and the case 120 may be sealed.
따라서 본 발명의 제2 실시예에 따른 이차전지(100)는 케이스(120)의 외주면에 실링부(122)와 재봉부(130)를 각각 겹쳐지지 않게 형성할 수 있으며, 이에 재봉부(130)에 의해 실링부(122)의 실링력 약화를 방지할 수 있다.Accordingly, the secondary battery 100 according to the second embodiment of the present invention may be formed so as not to overlap the sealing portion 122 and the sewing portion 130 on the outer circumferential surface of the case 120, and thus the sewing portion 130. By this, the weakening of the sealing force of the sealing part 122 can be prevented.
본 발명의 범위는 상기 상세한 설명보다는 후술하는 특허청구범위에 의하여 나타내어지며, 특허청구범위의 의미 및 범위 그리고 그 균등 개념으로부터 도출되는 다양한 실시 형태가 가능하다.The scope of the present invention is shown by the following claims rather than the detailed description, and various embodiments derived from the meaning and scope of the claims and their equivalents are possible.

Claims (23)

  1. 전극 조립체; 및An electrode assembly; And
    상기 전극 조립체가 수용되는 케이스를 포함하며,A case accommodating the electrode assembly;
    상기 케이스는 상기 전극 조립체가 수용되는 수용부와, 상기 수용부의 외주면에 형성되는 실링부 및 재봉부를 포함하는 이차전지.The case includes a receiving part in which the electrode assembly is accommodated, and a sealing part and a sewing part formed on an outer circumferential surface of the receiving part.
  2. 청구항 1에 있어서, The method according to claim 1,
    상기 실링부는 상기 수용부의 외주면을 열 융착하여 형성되고,The sealing portion is formed by thermal fusion of the outer peripheral surface of the receiving portion,
    상기 재봉부는 상기 실링부를 따라 형성되는 이차전지.The sewing unit is a secondary battery formed along the sealing unit.
  3. 청구항 1에 있어서, The method according to claim 1,
    상기 실링부는 상기 수용부의 외주면에서 가장자리를 제외한 부분을 열 융착함에 따라 형성되고,The sealing portion is formed by thermally fusion a portion excluding the edge from the outer peripheral surface of the receiving portion,
    상기 재봉부는 상기 수용부의 외주면에서 상기 가장자리에 형성되는 이차전지.The secondary battery is formed in the edge on the outer peripheral surface of the receiving portion.
  4. 청구항 1에 있어서, The method according to claim 1,
    상기 전극 조립체에는 상기 케이스의 밖으로 인출되는 제1 전극리드와 제2 전극리드가 결합되며,The electrode assembly is coupled to the first electrode lead and the second electrode lead drawn out of the case,
    상기 재봉부는 상기 제1 전극리드와 상기 제2 전극리드가 위치한 상기 수용부의 외주면 부분을 제외한 부분에 형성되는 이차전지.The sewing unit is a secondary battery is formed in a portion other than the outer peripheral surface portion of the receiving portion in which the first electrode lead and the second electrode lead.
  5. 청구항 4에 있어서, The method according to claim 4,
    상기 제1 전극리드와 상기 제2 전극리드는 서로 반대방향을 향하도록 상기 전극 조립체의 양 단부에 각각 결합되는 이차전지. The secondary battery is coupled to both ends of the electrode assembly so that the first electrode lead and the second electrode lead facing each other.
  6. 청구항 1에 있어서, The method according to claim 1,
    상기 재봉부는 상기 수용부의 외주면을 재봉실로 재봉하여 형성되는 이차전지.The sewing unit is a secondary battery formed by sewing the outer peripheral surface of the receiving unit with a sewing thread.
  7. 청구항 6에 있어서, The method according to claim 6,
    상기 재봉실은 상기 수용부의 외주면에 새발뜨기(herringbone stitch), 박음질(back stitch) 및 감침질(hemming sitch) 중 어느 하나의 바느질로 재봉되는 이차전지.The sewing thread is a secondary battery sewn on the outer circumferential surface of the accommodating portion by sewing of any one of a herringbone stitch, a back stitch and a hemming sitch.
  8. 청구항 6에 있어서,The method according to claim 6,
    상기 재봉실은 내측 재봉물질과 외측 재봉물질로 형성되는 이차전지.The sewing thread is a secondary battery formed of an inner sewing material and an outer sewing material.
  9. 청구항 8에 있어서,The method according to claim 8,
    상기 외측 재봉물질은 열에 의해 용융되는 합성수지로 형성되는 이차전지.The outer sewing material is a secondary battery formed of a synthetic resin that is melted by heat.
  10. 청구항 9에 있어서,The method according to claim 9,
    상기 외측 재봉물질은 상기 재봉실이 재봉된 상기 수용부의 외주면을 열융착할 시 용융되면서 상기 재봉실과 상기 수용부 사이의 틈새를 밀봉하는 이차전지. The outer sewing material is a secondary battery for sealing the gap between the sewing thread and the receiving portion while being melted when the sewing thread is heat-sealed the outer peripheral surface of the receiving portion sewn.
  11. 청구항 8에 있어서,The method according to claim 8,
    상기 내측 재봉물질은 상기 외측 재봉물질 보다 높은 용융점과 강도를 가지는 이차전지.The inner sewing material is a secondary battery having a higher melting point and strength than the outer sewing material.
  12. 청구항 8에 있어서,The method according to claim 8,
    상기 내측 재봉물질은 유연성을 가지는 금속, 고분자 물질 및 직물 중 어느 하나로 형성되는 이차전지.The inner sewing material is a secondary battery formed of any one of a metal, a polymer material and a fabric having flexibility.
  13. 전극 조립체를 준비하는 준비단계(S10);A preparation step (S10) of preparing an electrode assembly;
    상기 전극 조립체를 케이스의 수용부에 수용한 다음, 상기 케이스의 외주면을 실링하여 실링부를 형성하는 실링단계(S20); 및 A sealing step (S20) of accommodating the electrode assembly in the accommodation part of the case and then sealing an outer circumferential surface of the case to form a sealing part; And
    상기 케이스의 외주면에 재봉부를 형성하는 재봉단계(S30)를 포함하는 이차전지 제조방법.Secondary battery manufacturing method comprising a sewing step (S30) to form a sewing on the outer peripheral surface of the case.
  14. 청구항 13에 있어서, The method according to claim 13,
    상기 실링단계(S20)는 상기 케이스의 외주면을 열 융착하여 실링부를 형성하고,The sealing step (S20) is formed by heat-sealing the outer peripheral surface of the case to form a sealing portion,
    상기 재봉단계(S30)는 상기 실링부를 따라 재봉하여 재봉부를 형성하는 이차전지 제조방법.The sewing step (S30) is a secondary battery manufacturing method to form a sewing by sewing along the sealing.
  15. 청구항 13에 있어서, The method according to claim 13,
    상기 실링단계(S20)는 상기 케이스의 외주면에서 가장자리를 제외한 부분을 열 융착하여 실링부를 형성하고,The sealing step (S20) is a heat-sealed portion except the edge on the outer peripheral surface of the case to form a sealing portion,
    상기 재봉단계(S30)는 상기 케이스의 외주면에서 가장자리를 재봉하여 재봉부를 형성하는 이차전지 제조방법.The sewing step (S30) is a secondary battery manufacturing method for forming a sewing unit by sewing the edge on the outer peripheral surface of the case.
  16. 청구항 13에 있어서, The method according to claim 13,
    상기 재봉단계(S30)는 상기 수용부의 외주면을 재봉실로 재봉하여 형성되는 이차전지 제조방법.The sewing step (S30) is a secondary battery manufacturing method is formed by sewing the outer peripheral surface of the receiving portion with a sewing thread.
  17. 청구항 16에 있어서, The method according to claim 16,
    상기 재봉실은 내측 재봉물질과 외측 재봉물질로 형성되는 이차전지 제조방법.The sewing thread is a secondary battery manufacturing method formed of an inner sewing material and an outer sewing material.
  18. 청구항 17에 있어서,The method according to claim 17,
    상기 외측 재봉물질은 열에 의해 용융되는 합성수지로 형성되는 이차전지 제조방법.The outer sewing material is a secondary battery manufacturing method formed of a synthetic resin that is melted by heat.
  19. 청구항 18에 있어서,The method according to claim 18,
    상기 내측 재봉물질은 상기 외측 재봉물질 보다 높은 용융점과 강도를 가지는 이차전지 제조방법. The inner sewing material is a secondary battery manufacturing method having a higher melting point and strength than the outer sewing material.
  20. 청구항 13에 있어서,The method according to claim 13,
    상기 재봉단계(S30) 후, 상기 재봉부가 형성된 상기 케이스의 외주면을 열 융착하는 열 융착단계(S40)를 더 포함하며,After the sewing step (S30), further comprises a thermal fusion step (S40) for thermally fusion bonding the outer peripheral surface of the case in which the sewing unit is formed,
    상기 열 융착 단계(S40)는 상기 재봉부를 형성한 재봉실의 외측 재봉물질을 용융시켜서 상기 재봉실과 상기 케이스 사이의 틈새를 밀봉하는 이차전지 제조방법.The thermal fusion step (S40) is a secondary battery manufacturing method for sealing the gap between the sewing thread and the case by melting the outer sewing material of the sewing thread formed the sewing unit.
  21. 청구항 13에 있어서,The method according to claim 13,
    상기 준비단계(S10)는 제1 전극, 분리막 및 제2 전극이 교대로 적층한 다음, 상기 제1 전극의 제1 전극탭에 제1 전극리드를 결합하고, 상기 제2 전극의 제2 전극탭에 제2 전극리드를 결합하여 전극 조립체를 제조하는 이차전지 제조방법. In the preparing step (S10), the first electrode, the separator and the second electrode are alternately stacked, and then a first electrode lead is coupled to the first electrode tab of the first electrode, and the second electrode tab of the second electrode is combined. A secondary battery manufacturing method of manufacturing an electrode assembly by coupling a second electrode lead to.
  22. 청구항 21에 있어서,The method according to claim 21,
    상기 제1 전극리드와 상기 제2 전극리드는 서로 반대방향을 향하도록 상기 전극 조립체의 양 단부에 각각 결합되고, 상기 케이스 밖으로 인출되는 이차전지 제조방법. The first electrode lead and the second electrode lead is coupled to both ends of the electrode assembly so as to face in the opposite direction to each other, the secondary battery manufacturing method is drawn out of the case.
  23. 청구항 21에 있어서,The method according to claim 21,
    상기 재봉단계(S30)는 상기 제1 전극리드와 상기 제2 전극리드가 위치한 상기 케이스의 외주면을 제외한 부분을 재봉하여 재봉부를 형성하는 이차전지 제조방법.The sewing step (S30) is a secondary battery manufacturing method for forming a sewing unit by sewing a portion except the outer peripheral surface of the case where the first electrode lead and the second electrode lead is located.
PCT/KR2017/005966 2016-06-27 2017-06-08 Secondary battery and manufacturing method therefor WO2018004144A1 (en)

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