WO2018101634A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2018101634A1
WO2018101634A1 PCT/KR2017/012640 KR2017012640W WO2018101634A1 WO 2018101634 A1 WO2018101634 A1 WO 2018101634A1 KR 2017012640 W KR2017012640 W KR 2017012640W WO 2018101634 A1 WO2018101634 A1 WO 2018101634A1
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WO
WIPO (PCT)
Prior art keywords
cap plate
terminal
secondary battery
electrode
insulating
Prior art date
Application number
PCT/KR2017/012640
Other languages
French (fr)
Korean (ko)
Inventor
이은중
원희연
유대형
Original Assignee
삼성에스디아이주식회사
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 삼성에스디아이주식회사 filed Critical 삼성에스디아이주식회사
Priority to CN201780073741.4A priority Critical patent/CN110024201B/en
Publication of WO2018101634A1 publication Critical patent/WO2018101634A1/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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the 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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • 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
    • H01M50/562—Terminals characterised by the 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • 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

  • Embodiments of the present invention relate to a secondary battery.
  • Secondary batteries unlike primary batteries that cannot be charged, mean batteries that can be repeatedly charged and discharged, and have been applied to various technical fields throughout the industry. In addition, as technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing.
  • the secondary battery may be used in a form in which a single battery or a plurality of batteries are electrically connected according to the type of electronic device used therein, and may be connected to a protection circuit module for preventing overcharge, overcurrent, etc. of the secondary battery.
  • a protection circuit module for preventing overcharge, overcurrent, etc. of the secondary battery.
  • poor connection or the like may occur due to changes in the shape of the terminal during the manufacturing process of the secondary battery.
  • Embodiments of the present invention provide a secondary battery capable of preventing the shape of the terminal from changing during the manufacturing process of the secondary battery.
  • cans An electrode assembly housed inside the can; A cap plate for sealing the can; And a first terminal disposed on the cap plate and electrically connected to the cap plate, wherein the first terminal extends from the first part and is parallel to the cap plate and extends from the first part.
  • the shape of the terminal may be prevented from changing during the manufacturing process of the secondary battery.
  • the scope of the present invention is not limited by these effects.
  • FIG. 1 is a perspective view schematically illustrating a rechargeable battery according to an exemplary embodiment of the present invention.
  • FIG. 2 is an exploded perspective view schematically illustrating the rechargeable battery of FIG. 1.
  • FIG. 3 is a perspective view schematically illustrating an example of a first terminal of the rechargeable battery of FIG. 1.
  • FIG. 4 is a perspective view schematically illustrating a coupling state of a secondary battery and a protection circuit module of FIG. 1.
  • FIG. 5 is a perspective view schematically illustrating a modification of the first terminal of FIG. 3.
  • FIG. 6 is a perspective view schematically illustrating another example of the first terminal of the rechargeable battery of FIG. 1.
  • FIG. 7 is a schematic cross-sectional view taken along line II ′ of FIG. 6.
  • Secondary battery cans; An electrode assembly housed inside the can; A cap plate for sealing the can; And a first terminal disposed on the cap plate and electrically connected to the cap plate, wherein the first terminal extends from the first part and is parallel to the cap plate and extends from the first part.
  • the second part may extend in a direction different from the longitudinal direction of the first part.
  • a first bent groove may be formed at a boundary between the first area and the second area.
  • the reinforcement part may be a folding part in which an edge located at an opposite side to the second part among the edges of the first part parallel to the longitudinal direction of the cap plate is folded onto the first part.
  • the shortest distance between the end of the folded portion and the welding portion may be 0.5mm to 1mm.
  • the width of the folded portion perpendicular to the longitudinal direction of the cap plate may be 0.4mm to 0.7mm.
  • the weld part may include a pair of weld parts spaced apart from each other, and the first part may include a slit penetrating the first part between the pair of weld parts.
  • the distance between the pair of welds and the slit may be 0.5mm to 1mm, respectively.
  • the reinforcement part may be a ridge in which a part of the first part protrudes convexly in a direction opposite to the cap plate.
  • the height of the ridge may be greater than the thickness of the first part, and may be less than twice the thickness of the first part.
  • the first terminal and the cap plate are formed of different materials
  • the secondary battery includes a coupling piece formed of the same material as the first terminal between the first terminal and the cap plate. It may further include.
  • the cap plate may include an electrode pin electrically connected to the electrode assembly, and the secondary battery may include a second terminal disposed on the cap plate and spaced apart from the first terminal, and the cap plate;
  • the electronic device may further include a first insulating tape between the second terminals.
  • the first insulating tape may include a first insulating portion covering an area of the cap plate overlapping the second terminal, and a continuous portion of the four insulating sides of the can. It may include a second insulating portion and a third insulating portion respectively covering some of the two sides facing each other.
  • the secondary battery may further include a second insulating tape disposed between the first insulating portion and the second terminal.
  • the thickness of the second insulating tape may be thicker than the thickness of the first insulating tape.
  • the second terminal may include a first electrode tab connected to the electrode pin, a second electrode tab spaced apart from the first electrode tab along a length direction of the cap plate, and the first electrode.
  • the display device may include a temperature element disposed between the tab and the second electrode tab and connected to the first electrode tab and the second electrode tab.
  • the secondary battery may further include a fixing member covering the second terminal and fixing the second terminal.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are only used to distinguish one component from another.
  • FIG. 1 is a perspective view schematically illustrating a rechargeable battery according to an exemplary embodiment of the present invention
  • FIG. 2 is an exploded perspective view schematically illustrating a rechargeable battery of FIG. 1
  • FIG. 3 is a view of a first terminal of the rechargeable battery of FIG. 1.
  • 4 is a perspective view schematically illustrating an example
  • FIG. 4 is a perspective view schematically illustrating a coupling state of a secondary battery and a protection circuit module of FIG. 1.
  • a secondary battery 1 may include a bare cell B, a first terminal 30, a second terminal 40, and a first insulating tape 50. ), A second insulating tape 60, and a fixing member 70.
  • the bare cell B is a rechargeable secondary battery, for example, may be configured as a lithium-ion battery.
  • the bare cell B includes a can 10 including an opening, an electrode assembly 12 accommodated inside the can 10 through the opening of the can 10, and a cap plate 20 sealing the opening of the can 10. ) May be included.
  • the can 10 may be made of a metallic material in the shape of a substantially hexahedron having one side open.
  • can 10 may be made of aluminum or an aluminum alloy.
  • An electrolyte may be accommodated together with the electrode assembly 12 in the can 10.
  • the electrode assembly 12 may include a first electrode plate and a second electrode plate coated with the electrode active material, and a separator interposed therebetween.
  • the first electrode plate and the second electrode plate have different polarities.
  • the electrode assembly 12 may be manufactured by winding the first electrode plate, the separator, and the second electrode plate sequentially to be stacked in a jellyroll form.
  • the electrode assembly 12 may be a laminate in which the first electrode plate, the separator, and the second electrode plate are sequentially stacked.
  • the opening can be sealed by the cap plate 20.
  • the cap plate 20 may be made of a metallic material such as aluminum or an aluminum alloy. The part where the cap plate 20 and the can 10 contact each other may be joined by laser welding or the like.
  • the cap plate 20 may include an electrode pin 21.
  • the electrode pin 21 may be electrically connected to the electrode assembly 12 through the cap plate 20 and may protrude along the direction away from the cap plate 20.
  • the first electrode plate of the electrode assembly 12 is connected to the electrode pin 21
  • the second electrode plate of the electrode assembly 12 is electrically connected to the cap plate 20, and the electrode pin 21
  • the cap plate 20 may have different polarities. Therefore, a gasket 23 may be provided between the electrode pin 21 and the cap plate 20 to prevent a short circuit between the electrode pin 21 and the cap plate 20.
  • the cap plate 20 and the can 10 may have the same polarity.
  • the electrode pin 21 may have the polarity of the negative electrode
  • the can 10 and the cap plate 20 may have the polarity of the positive electrode.
  • the first terminal 30 may be disposed on the partial region 20a of the cap plate 20, and the second terminal 40 may be disposed on the other region 20b of the cap plate 20. In an embodiment, the first terminal 30 and the second terminal 40 may be disposed opposite to each other with respect to the electrode pin 21.
  • the first terminal 30 and the cap plate 20 may include different materials.
  • the cap plate 20 may be formed of aluminum or an aluminum alloy, and the first terminal 30 may be formed of nickel.
  • the coupling piece 22 may be further included on the cap plate 20.
  • the coupling piece 22 may be made of the same material as the first terminal 30.
  • the first terminal 30 and the second terminal 40 may electrically connect the secondary battery 1 to the protection circuit module.
  • the first and second terminals 30 and 40 are welded to the connection ends 110 formed on the circuit board 100 of the protection circuit module, respectively, so that the secondary battery 1 is a protection circuit. It can be electrically connected to the module.
  • One or more secondary batteries 1 may be electrically connected to the protection circuit module, and the overcharge, overdischarge, overcurrent, short circuit, reverse voltage, etc. of the secondary battery 1 may be prevented from the circuit board 100 of the protection circuit module.
  • a plurality of devices may be mounted.
  • the first terminal 30 includes a first part 31 parallel to the cap plate 20, a second part 32 extending from the first part 31 and bent relative to the first part 31, and a first part 31. It may include a reinforcing portion formed on one part (31).
  • the second part 32 may extend from the first part 31 in a direction different from the length direction of the first part 31. For example, the second part 32 may extend in a direction perpendicular to the longitudinal direction of the first part 31.
  • the first part 31 is a first part S1 which is an area connected to the second part 32 and a first part S1 which is adjacent to the first area S1 and is welded with the cap plate 20. It may include a second area (S2), wherein the bending position of the second part 32 is determined at the boundary between the first area (S1) and the second area (S2) and the bending of the second part 32 is easy.
  • the first bent groove G1 may be formed.
  • the reinforcement part formed in the first part 31 is continuously formed over the first area S1 and the second area S2, so that the shape of the first terminal 30 is changed during the manufacturing process of the secondary battery 1. It can prevent the change.
  • the reinforcing part of the edges of the first part 31 parallel to the longitudinal direction of the cap plate 20, the edge located on the side opposite to the second part 32 is folded on the first part 31. (33).
  • the first terminal 30 After the first terminal 30 is fixed on the cap plate 20 by a jig or the like, a welding rod is brought into contact with the welding portion W of the second region S2 to perform welding on the cap plate 20. Are welded. After the welding is completed, the jig fixing the first terminal 30 is removed. At this time, since the first terminal 30 has a thin thickness of about 0.1T, the first region 30 may be formed by a magnet or the like included in the jig. As S1) is easily heard, bending or the like may occur in the first part 31. In particular, since the width of the first part 31 is minimized in the region where the first bending groove G1 is formed, the first region S1 based on the imaginary line BL formed along the first bending groove G1. ) May be bent or bent upwards, whereby the position of the second part 32 is not aligned with the connection end 110 formed on the circuit board 100 of the protection circuit module, and thus the position is displaced. ), Welding defects may occur.
  • the first region S1 can be prevented from bending or bending upward based on the imaginary line BL. Alignment between the second part 32 and the connection end 110 may be maintained to improve manufacturing efficiency of the module including the secondary battery 1.
  • the first distance (D1) between the end of the folded portion 33 and the welding portion (W) may be 0.5mm to 1mm.
  • the first distance D1 refers to the shortest distance measured from the end of the folded portion 33 to the outermost region of the weld portion W in a direction perpendicular to the longitudinal direction of the cap plate 20.
  • the welding rod When the first distance D1 is larger than 1 mm, the welding rod is positioned close to the edge of the first part 31 on which the fold portion 33 is formed, or close to the edge of the opposite side, or over-welded and welded. Poor welding, such as burn, may occur.
  • the first distance D1 is smaller than 0.5 mm, a large amount of reactive current flows to the folded portion 33 having reduced resistance due to an increase in thickness, thereby reducing the welding efficiency, and the folded portion 33 ) And the electrode can be in contact with each other, thereby also causing a poor welding.
  • the width L of the folded portion 33 perpendicular to the longitudinal direction of the cap plate 20 may be 0.4 mm to 0.7 mm.
  • the width L of the folded portion 33 is larger than 0.7 mm, as the distance between the tip of the folded portion 33 and the welding rod becomes closer during welding, the likelihood of welding failure due to an increase in reactive current increases.
  • the width L of the folded portion 33 is smaller than 0.4 mm, it is difficult to form the folded portion 33 and it is difficult to effectively prevent the first region S1 from bending or bending upward.
  • the second terminal 40 is disposed on the cap plate 20 and may be electrically connected to the electrode pin 21.
  • the second terminal 40 has a first electrode tab 41 connected to the electrode pin 21 and a second electrode tab 42 spaced apart from the first electrode tab 41 along the length of the cap plate 20.
  • a temperature element 45 positioned between the first and second electrode tabs 41 and 42. Both ends 45a and 45b of the temperature element 45 may be connected to the first electrode tab 41 and the second electrode tab 42 by welding or the like, respectively.
  • the second electrode tab 42 includes a first part 42a parallel to the cap plate 20, a second part 42b extending from and bent from the first part 42a, and the first part 42a. May include a second bending groove G2.
  • the second bending groove G2 may be formed at a position where the second part 42b extends to determine the bending position of the second part 42b and to facilitate bending of the second part 42b.
  • the second part 42b may be connected to the connection end 110 formed on the circuit board 100 of the protection circuit module through welding or the like.
  • the first insulating tape 50 may be disposed between the second terminal 40 and the cap plate 20 to prevent a short circuit between the second terminal 40 and the outer surface of the bare cell B.
  • the first insulation tape 50 may include a first insulation portion 51 and a first insulation portion 51 that cover another region 20b of the cap plate 20 overlapping the second terminal 40. And a second insulator 52 and a third insulator 53 which are continuous with each other and cover some of the two sides 11 facing each other among the four sides of the can 10. .
  • the inner surface of the first insulating tape 50 facing the bare cell (B) may have an adhesive force and may be attached to the cap plate 20 and the can 10.
  • the first insulating tape 50 may be made of a thin polyethyleneterephthalate (PET) film having a thin thickness to prevent an increase in the thickness of the secondary battery 1.
  • PET polyethyleneterephthalate
  • the second insulating tape 60 may be disposed between the first insulating portion 51 and the second terminal 40 of the first insulating tape 50.
  • the second insulating tape 60 may be formed thicker than the first insulating tape 50. Therefore, the second terminal 40 and the like prevent the occurrence of the tear in the first insulating portion 51, and even if the tear occurs in the first insulating portion 51, the second terminal 40 and the cap plate ( 20) Short circuit can be prevented from occurring.
  • the second insulating tape 60 may include an adhesive material provided on at least one of a surface facing the first insulating tape 50 and a surface facing the second terminal 40.
  • the second insulating tape 60 may be a single-sided adhesive tape having an adhesive force on a surface facing the first insulating tape 50.
  • the second insulating tape 60 is a double-sided adhesive tape having an adhesive force on both a surface facing the first insulating tape 50 and a surface facing the second terminal 40. May be).
  • the fixing member 70 may cover the second terminal 40 to prevent the second terminal 40 from being separated or dropped from the bare cell B.
  • the first electrode tab 41 of the second terminal 40 may be coupled to the bare cell B while being directly welded to the electrode pin 21, but the position of the second electrode tab 42 is fixed. It may not be. Therefore, the fixing member 70 is disposed to cover the second terminal 40, so that the second terminal 40 is removed from the bare cell B or the second terminal 40 moves to move the outside of the bare cell B. Short circuits and the like can be prevented.
  • the fixing member 70 may have a shape similar to that of the first insulating tape 50.
  • the fixing member 70 is formed in a portion covering the first terminal 30 and continuously, and overlaps with the second insulating portion 52 and the third insulating portion 53 of the first insulating tape 50. It may include an end.
  • the fixing member 70 may be a plastic injection molding or an adhesive tape. For example, when the fixing member 70 is an adhesive tape, an increase in thickness of the secondary battery 1 may be minimized.
  • FIG. 5 is a perspective view schematically illustrating a modification of the first terminal of FIG. 3.
  • first terminal 30B of FIG. 5 has the same basic configuration as that of the first terminal 30 shown in FIG. 3 and described with reference to FIG. 3, only the differences will be described below.
  • the first part 31 of the first terminal 30B may include a slit 34 passing through the first part 31 between a pair of welded portions W spaced apart from each other. have.
  • the slit 34 may extend larger than the diameter of the weld portion W in a direction perpendicular to the length direction of the cap plate 20 of FIG. 2.
  • the slit 34 reduces the leakage current flowing through the first part 31 when performing electrical resistance welding between the pair of welds W.
  • the vertical width of the slit 34 passing through the center of the slit 34 may be 1 mm to 3 mm, and the horizontal width of the slit 34 may be 0.5 mm to 1 mm, but is not limited thereto.
  • the second distance D2 between the pair of welding portions W and the slits 34 may be 0.5 mm to 1 mm, respectively. If the second distance D2 is greater than 1 mm, the welding efficiency may decrease as the distance between the pair of welds W increases, and if the second distance D2 is smaller than 0.5 mm, the slit ( 34) contact with welding rod may lead to over-welding and bursting.
  • FIG. 6 is a perspective view schematically illustrating another example of the first terminal of the rechargeable battery of FIG. 1, and FIG. 7 is a cross-sectional view schematically illustrating a cross-sectional view taken along line II ′ of FIG. 6.
  • the first terminal 30C extends from the first part 31, the second part 32 extending from the first part 31 and bent relative to the first part 31, and It may include a reinforcing portion formed on the first part 31.
  • the second part 31 may extend in a direction perpendicular to the longitudinal direction of the first part 31.
  • the first part 31 may include a first region S1, which is an area connected to the second part 32, and a second region S2, which is adjacent to the first area S1, wherein the reinforcement part is formed in the first part S1. It may be continuously formed over the first region S1 and the second region S2.
  • a first bending groove G1 for determining the bending position of the second part 32 and facilitating bending of the second part 32 is provided. Can be formed.
  • the reinforcement part may be a ridge 35 in which a part of the first part 31 is convexly protruded in an upward direction, that is, in a direction opposite to the cap plate 20 of FIG. 2.
  • the first region S1 opens the first bent groove G1. It is possible to more effectively prevent the phenomenon of bending or bending in an upward direction based on the virtual line BL formed accordingly.
  • the height T2 of the ridge 35 is larger than the thickness T1 of the first part 31.
  • the height of the ridge 35 means the length measured from the bottom of the first part 31 to the highest point of the ridge 35.
  • the ridge 35 may form a part of the first part 31 by a drawing process, wherein the height T2 of the ridge 35 is equal to the thickness T1 of the first part 31.
  • tearing may occur in the ridge 35, and the height T2 of the ridge 35 may be formed to be less than twice the thickness T1 of the first part 31. .

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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)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

Disclosed in one embodiment of the present invention is a secondary battery comprising: a can; an electrode assembly accommodated in the can; a cap plate for sealing the can; and a first terminal located on the cap plate and electrically connected to the cap plate, wherein the first terminal includes a first part parallel to the cap plate, a second part extending from the first part and bent with respect to the first part, and a reinforcement part formed on the first part, the first part includes a first region connected to the second part, and a second region which is adjacent to the first region and in which a welded part welded with the cap plate is located, and the reinforcement part continuously formed over the first region and the second region.

Description

이차 전지Secondary battery
본 발명의 실시예들은, 이차 전지에 관한 것이다.Embodiments of the present invention relate to a secondary battery.
이차 전지는 충전이 불가능한 일차 전지와는 달리, 반복적인 충전 및 방전이 가능한 전지를 의미하는 것으로서, 산업 전반에 걸친 다양한 기술분야에 적용되고 있다. 또한, 모바일 기기에 대한 기술 개발과 수요가 증가함에 따라 에너지원으로서의 이차 전지의 수요가 급격히 증가하고 있다.Secondary batteries, unlike primary batteries that cannot be charged, mean batteries that can be repeatedly charged and discharged, and have been applied to various technical fields throughout the industry. In addition, as technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing.
이차 전지는 그것이 사용되는 전자 기기의 종류에 따라 단일 전지 또는 다수의 전지들이 전기적으로 연결된 형태로 사용될 수 있으며, 이차 전지의 과충전, 과전류 등을 방지하는 보호회로모듈 등과 연결될 수 있다. 그러나, 이차 전지의 제조 공정 중 단자의 형상이 변하는 등에 의해 접속 불량 등이 발생할 수 있다.The secondary battery may be used in a form in which a single battery or a plurality of batteries are electrically connected according to the type of electronic device used therein, and may be connected to a protection circuit module for preventing overcharge, overcurrent, etc. of the secondary battery. However, poor connection or the like may occur due to changes in the shape of the terminal during the manufacturing process of the secondary battery.
본 발명의 실시예들은, 이차 전지의 제조 공정 중 단자의 형상이 변하는 것을 방지할 수 있는 이차 전지를 제공한다.Embodiments of the present invention provide a secondary battery capable of preventing the shape of the terminal from changing during the manufacturing process of the secondary battery.
본 발명의 일 실시예는, 캔; 상기 캔의 내부에 수용된 전극 조립체; 상기 캔을 밀봉하는 캡 플레이트; 및 상기 캡 플레이트 상에 위치하고, 상기 캡 플레이트와 전기적으로 연결된 제1 단자;를 포함하고, 상기 제1 단자는, 상기 캡 플레이트와 나란한 제1 파트, 상기 제1 파트로부터 연장되고 상기 제1 파트에 대하여 절곡된 제2 파트, 및 상기 제1 파트 상에 형성된 보강부를 포함하고, 상기 제1 파트는, 상기 제2 파트와 연결된 제1 영역, 상기 제1 영역과 인접하고 상기 캡 플레이트와 용접된 용접부가 위치하는 제2 영역을 포함하며, 상기 보강부는 상기 제1 영역과 상기 제2 영역에 걸쳐 연속적으로 형성된 이차 전지를 개시한다.One embodiment of the present invention, cans; An electrode assembly housed inside the can; A cap plate for sealing the can; And a first terminal disposed on the cap plate and electrically connected to the cap plate, wherein the first terminal extends from the first part and is parallel to the cap plate and extends from the first part. A second part bent relative to the first part, and a reinforcement part formed on the first part, wherein the first part includes a first area connected to the second part, a weld part adjacent to the first area and welded to the cap plate; And a second region in which the reinforcement portion is formed, and the secondary battery is continuously formed over the first region and the second region.
본 발명의 실시예들에 의하면, 이차 전지의 제조 공정 중 단자의 형상이 변하는 것이 방지될 수 있다. 물론 이러한 효과에 의해 본 발명의 범위가 한정되는 것은 아니다.According to embodiments of the present invention, the shape of the terminal may be prevented from changing during the manufacturing process of the secondary battery. Of course, the scope of the present invention is not limited by these effects.
도 1은 본 발명의 일 실시예에 따른 이차 전지를 개략적으로 도시한 사시도이다.1 is a perspective view schematically illustrating a rechargeable battery according to an exemplary embodiment of the present invention.
도 2는 도 1의 이차 전지를 개략적으로 도시한 분해 사시도이다.FIG. 2 is an exploded perspective view schematically illustrating the rechargeable battery of FIG. 1.
도 3은 도 1의 이차 전지의 제1 단자의 일 예를 개략적으로 도시한 사시도이다.3 is a perspective view schematically illustrating an example of a first terminal of the rechargeable battery of FIG. 1.
도 4는 도 1의 이차 전지와 보호회로모듈의 결합 상태를 개략적으로 도시한 사시도이다.4 is a perspective view schematically illustrating a coupling state of a secondary battery and a protection circuit module of FIG. 1.
도 5는 도 3의 제1 단자의 변형예를 개략적으로 도시한 사시도이다.FIG. 5 is a perspective view schematically illustrating a modification of the first terminal of FIG. 3.
도 6은 도 1의 이차 전지의 제1 단자의 다른 예를 개략적으로 도시한 사시도이다.6 is a perspective view schematically illustrating another example of the first terminal of the rechargeable battery of FIG. 1.
도 7은 도 6의 I-I' 단면을 개략적으로 도시한 단면도이다.FIG. 7 is a schematic cross-sectional view taken along line II ′ of FIG. 6.
본 발명의 일 실시예에 따른 이차 전지는, 캔; 상기 캔의 내부에 수용된 전극 조립체; 상기 캔을 밀봉하는 캡 플레이트; 및 상기 캡 플레이트 상에 위치하고, 상기 캡 플레이트와 전기적으로 연결된 제1 단자;를 포함하고, 상기 제1 단자는, 상기 캡 플레이트와 나란한 제1 파트, 상기 제1 파트로부터 연장되고 상기 제1 파트에 대하여 절곡된 제2 파트, 및 상기 제1 파트 상에 형성된 보강부를 포함하고, 상기 제1 파트는, 상기 제2 파트와 연결된 제1 영역, 상기 제1 영역과 인접하고 상기 캡 플레이트와 용접된 용접부가 위치하는 제2 영역을 포함하며, 상기 보강부는 상기 제1 영역과 상기 제2 영역에 걸쳐 연속적으로 형성될 수 있다.Secondary battery according to an embodiment of the present invention, cans; An electrode assembly housed inside the can; A cap plate for sealing the can; And a first terminal disposed on the cap plate and electrically connected to the cap plate, wherein the first terminal extends from the first part and is parallel to the cap plate and extends from the first part. A second part bent relative to the first part, and a reinforcement part formed on the first part, wherein the first part includes a first area connected to the second part, a weld part adjacent to the first area and welded to the cap plate; And a second area in which the reinforcement part is continuously formed over the first area and the second area.
본 실시예에 있어서, 상기 제2 파트는 상기 제1 파트의 길이 방향과 상이한 방향으로 연장될 수 있다.In the present embodiment, the second part may extend in a direction different from the longitudinal direction of the first part.
본 실시예에 있어서, 상기 제1 영역과 상기 제2 영역의 경계에는 제1 절곡 홈이 형성될 수 있다.In the present exemplary embodiment, a first bent groove may be formed at a boundary between the first area and the second area.
본 실시예에 있어서, 상기 보강부는 상기 캡 플레이트의 길이 방향과 나란한 상기 제1 파트의 가장자리들 중, 상기 제2 파트와 반대측에 위치하는 가장자리가 상기 제1 파트 상으로 접힌 접힘부일 수 있다.In the present exemplary embodiment, the reinforcement part may be a folding part in which an edge located at an opposite side to the second part among the edges of the first part parallel to the longitudinal direction of the cap plate is folded onto the first part.
본 실시예에 있어서, 상기 접힘부의 끝단과 상기 용접부 간의 최단 거리는 0.5㎜ 내지 1㎜일 수 있다.In this embodiment, the shortest distance between the end of the folded portion and the welding portion may be 0.5mm to 1mm.
본 실시예에 있어서, 상기 캡 플레이트의 길이 방향과 수직한 상기 접힘부의 폭은 0.4㎜ 내지 0.7㎜일 수 있다.In this embodiment, the width of the folded portion perpendicular to the longitudinal direction of the cap plate may be 0.4mm to 0.7mm.
본 실시예에 있어서, 상기 용접부는 서로 이격된 한 쌍의 용접부들을 포함하고, 상기 제1 파트는 상기 한 쌍의 용접부들 사이에 상기 제1 파트를 관통하는 슬릿을 포함할 수 있다.In the present exemplary embodiment, the weld part may include a pair of weld parts spaced apart from each other, and the first part may include a slit penetrating the first part between the pair of weld parts.
본 실시예에 있어서, 상기 한 쌍의 용접부들과 상기 슬릿 간의 거리는 각각 0.5㎜ 내지 1㎜일 수 있다.In this embodiment, the distance between the pair of welds and the slit may be 0.5mm to 1mm, respectively.
본 실시예에 있어서, 상기 보강부는, 상기 제1 파트의 일부가 상기 캡 플레이트와 반대 방향으로 볼록하게 돌출된 융기부일 수 있다.In the present exemplary embodiment, the reinforcement part may be a ridge in which a part of the first part protrudes convexly in a direction opposite to the cap plate.
본 실시예에 있어서, 상기 융기부의 높이는 상기 제1 파트의 두께보다 크고, 상기 제1 파트의 두께의 2배 이하일 수 있다.In the present embodiment, the height of the ridge may be greater than the thickness of the first part, and may be less than twice the thickness of the first part.
본 실시예에 있어서, 상기 제1 단자와 상기 캡 플레이트는 서로 상이한 재질로 형성되고, 상기 이차 전지는, 상기 제1 단자와 상기 캡 플레이트 사이에, 상기 제1 단자와 동일한 재질로 형성된 결합편을 더 포함할 수 있다.In the present exemplary embodiment, the first terminal and the cap plate are formed of different materials, and the secondary battery includes a coupling piece formed of the same material as the first terminal between the first terminal and the cap plate. It may further include.
본 실시예에 있어서, 상기 캡 플레이트는 상기 전극 조립체와 전기적으로 연결된 전극핀을 포함하고, 상기 이차 전지는, 상기 캡 플레이트 상에 위치하고 상기 제1 단자와 이격된 제2 단자 및, 상기 캡 플레이트와 상기 제2 단자 사이의 제1 절연 테이프를 더 포함할 수 있다.The cap plate may include an electrode pin electrically connected to the electrode assembly, and the secondary battery may include a second terminal disposed on the cap plate and spaced apart from the first terminal, and the cap plate; The electronic device may further include a first insulating tape between the second terminals.
본 실시예에 있어서, 상기 제1 절연 테이프는, 상기 제2 단자와 중첩하는 상기 캡 플레이트의 영역을 커버하는 제1 절연부, 상기 제1 절연부와 연속적으로 이루어지고 상기 캔의 네 개의 측면 중 서로 대향하는 두 개의 측면들 중 일부를 각각 커버하는 제2 절연부와 제3 절연부를 포함할 수 있다.In the present embodiment, the first insulating tape may include a first insulating portion covering an area of the cap plate overlapping the second terminal, and a continuous portion of the four insulating sides of the can. It may include a second insulating portion and a third insulating portion respectively covering some of the two sides facing each other.
본 실시예에 있어서, 상기 이차 전지는, 상기 제1 절연부와 상기 제2 단자 사이에 배치된 제2 절연 테이프를 더 포함할 수 있다.In the present embodiment, the secondary battery may further include a second insulating tape disposed between the first insulating portion and the second terminal.
본 실시예에 있어서, 상기 제2 절연 테이프의 두께는 상기 제1 절연 테이프의 두께보다 두꺼울 수 있다.In the present embodiment, the thickness of the second insulating tape may be thicker than the thickness of the first insulating tape.
본 실시예에 있어서, 상기 제2 단자는, 상기 전극핀과 접속하는 제1 전극 탭, 상기 캡 플레이트의 길이 방향을 따라 상기 제1 전극 탭과 상호 이격된 제2 전극 탭, 및 상기 제1 전극 탭과 상기 제2 전극 탭 사이에 위치하고, 상기 제1 전극 탭 및 상기 제2 전극 탭과 접속된 온도 소자를 포함할 수 있다.In the present exemplary embodiment, the second terminal may include a first electrode tab connected to the electrode pin, a second electrode tab spaced apart from the first electrode tab along a length direction of the cap plate, and the first electrode. The display device may include a temperature element disposed between the tab and the second electrode tab and connected to the first electrode tab and the second electrode tab.
본 실시예에 있어서, 상기 이차 전지는, 상기 제2 단자를 커버하며 상기 제2 단자를 고정시키는 고정 부재를 더 포함할 수 있다.In the present embodiment, the secondary battery may further include a fixing member covering the second terminal and fixing the second terminal.
전술한 것 외의 다른 측면, 특징, 이점이 이하의 도면, 특허청구범위 및 발명의 상세한 설명으로부터 명확해질 것이다.Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.
본 발명은 다양한 변환을 가할 수 있고 여러 가지 실시예를 가질 수 있는 바, 특정 실시예들을 도면에 예시하고 상세한 설명에 상세하게 설명하고자 한다. 그러나, 이는 본 발명을 특정한 실시 형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변환, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다. 본 발명을 설명함에 있어서 관련된 공지 기술에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우 그 상세한 설명을 생략한다. As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.
제1, 제2 등의 용어는 다양한 구성요소들을 설명하는데 사용될 수 있지만, 구성요소들은 용어들에 의해 한정되어서는 안 된다. 용어들은 하나의 구성요소를 다른 구성요소로부터 구별하는 목적으로만 사용된다.Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are only used to distinguish one component from another.
본 출원에서 사용한 용어는 단지 특정한 실시예를 설명하기 위해 사용된 것으로, 본 발명을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. 또한 각 도면에서, 구성요소는 설명의 편의 및 명확성을 위하여 과장되거나 생략되거나 또는 개략적으로 도시되었으며, 각 구성요소의 크기는 실제크기를 전적으로 반영하는 것은 아니다.The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In addition, in each drawing, components are exaggerated, omitted, or schematically illustrated for convenience and clarity of description, and the size of each component does not entirely reflect the actual size.
각 구성요소의 설명에 있어서, 상(on)에 또는 하(under)에 형성되는 것으로 기재되는 경우에 있어, 상(on)과 하(under)는 직접 또는 다른 구성요소를 개재하여 형성되는 것을 모두 포함하며, 상(on) 및 하(under)에 대한 기준은 도면을 기준으로 설명한다.In the description of each component, when described as being formed on or under, both on and under are formed either directly or through other components. And on and under criteria will be described with reference to the drawings.
이하, 본 발명의 실시 예를 첨부도면을 참조하여 상세히 설명하기로 하며, 첨부 도면을 참조하여 설명함에 있어, 동일하거나 대응하는 구성 요소는 동일한 도면번호를 부여하고 이에 대한 중복되는 설명은 생략하기로 한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, and in the following description with reference to the accompanying drawings, the same or corresponding components will be given the same reference numerals and redundant description thereof will be omitted. do.
도 1은 본 발명의 일 실시예에 따른 이차 전지를 개략적으로 도시한 사시도, 도 2는 도 1의 이차 전지를 개략적으로 도시한 분해 사시도, 도 3은 도 1의 이차 전지의 제1 단자의 일 예를 개략적으로 도시한 사시도, 그리고 도 4는 도 1의 이차 전지와 보호회로모듈의 결합 상태를 개략적으로 도시한 사시도이다.1 is a perspective view schematically illustrating a rechargeable battery according to an exemplary embodiment of the present invention, FIG. 2 is an exploded perspective view schematically illustrating a rechargeable battery of FIG. 1, and FIG. 3 is a view of a first terminal of the rechargeable battery of FIG. 1. 4 is a perspective view schematically illustrating an example, and FIG. 4 is a perspective view schematically illustrating a coupling state of a secondary battery and a protection circuit module of FIG. 1.
도 1 내지 도 4를 참조하면, 본 발명의 일 실시예에 다른 이차 전지(1)는, 베어 셀(B), 제1 단자(30), 제2 단자(40), 제1 절연 테이프(50), 제2 절연 테이프(60), 및 고정 부재(70)를 포함할 수 있다.1 to 4, a secondary battery 1 according to an embodiment of the present invention may include a bare cell B, a first terminal 30, a second terminal 40, and a first insulating tape 50. ), A second insulating tape 60, and a fixing member 70.
베어 셀(B)은 재충전이 가능한 이차 전지로서 일 예로, 리튬-이온 전지로 구성될 수 있다. 베어 셀(B)은 개구를 포함하는 캔(10), 캔(10)의 개구를 통해 캔(10)의 내부에 수용된 전극 조립체(12) 및 캔(10)의 개구를 밀폐하는 캡 플레이트(20)를 포함할 수 있다.The bare cell B is a rechargeable secondary battery, for example, may be configured as a lithium-ion battery. The bare cell B includes a can 10 including an opening, an electrode assembly 12 accommodated inside the can 10 through the opening of the can 10, and a cap plate 20 sealing the opening of the can 10. ) May be included.
캔(10)은 일 측면이 개방된 대략 육면체의 형상으로, 금속성 소재로 제작될 수 있다. 예컨대, 캔(10)은 알루미늄 또는 알루미늄 합금으로 제작될 수 있다. 캔(10)의 내부에는 전극 조립체(12)와 함께 전해질이 수용될 수 있다.The can 10 may be made of a metallic material in the shape of a substantially hexahedron having one side open. For example, can 10 may be made of aluminum or an aluminum alloy. An electrolyte may be accommodated together with the electrode assembly 12 in the can 10.
전극 조립체(12)는 전극 활물질이 도포된 제1 전극판과 제2 전극판, 및 이들 사이에 개재된 세퍼레이터를 포함할 수 있다. 제1 전극판과 제2 전극판은 서로 다른 극성을 갖는다. 전극 조립체(12)는, 일 예로, 제1 전극판, 세퍼레이터 및 제2 전극판이 순차적으로 적층된 후 젤리롤 형태가 되도록 권취하여 제작될 수 있다. 다른 예로, 전극 조립체(12)는, 제1 전극판, 세퍼레이터 및 제2 전극판이 순차적으로 적층된 적층체일 수 있다.The electrode assembly 12 may include a first electrode plate and a second electrode plate coated with the electrode active material, and a separator interposed therebetween. The first electrode plate and the second electrode plate have different polarities. For example, the electrode assembly 12 may be manufactured by winding the first electrode plate, the separator, and the second electrode plate sequentially to be stacked in a jellyroll form. As another example, the electrode assembly 12 may be a laminate in which the first electrode plate, the separator, and the second electrode plate are sequentially stacked.
전극 조립체(12)가 개구를 통해서 캔(10)에 수용되면, 개구는 캡 플레이트(20)에 의해 밀봉될 수 있다. 캡 플레이트(20)는 캔(10)과 마찬가지로 알루미늄 또는, 알루미늄 합금과 같은 금속성 소재로 제작될 수 있다. 캡 플레이트(20)와 캔(10)이 접하는 부분은 레이저 용접 등에 의해 접합될 수 있다.Once the electrode assembly 12 is received in the can 10 through the opening, the opening can be sealed by the cap plate 20. Like the can 10, the cap plate 20 may be made of a metallic material such as aluminum or an aluminum alloy. The part where the cap plate 20 and the can 10 contact each other may be joined by laser welding or the like.
캡 플레이트(20)는 전극핀(21)을 포함할 수 있다. 전극핀(21)은 캡 플레이트(20)를 관통하여 전극 조립체(12)와 전기적으로 연결되고, 캡 플레이트(20)로부터 멀어지는 방향을 따라 돌출될 수 있다. 한편, 전극 조립체(12)의 제1 전극판은 전극핀(21)과 연결되고, 전극 조립체(12)의 제2 전극판은 캡 플레이트(20)와 전기적으로 연결되어, 전극핀(21)과 캡 플레이트(20)는 서로 다른 극성을 가질 수 있다. 따라서, 전극핀(21)과 캡 플레이트(20) 간의 단락을 방지하기 위하여 전극핀(21)과 캡 플레이트(20) 사이에는 가스켓(23)이 구비될 수 있다. 한편, 캡 플레이트(20)와 캔(10)은 동일한 극성을 가질 수 있다. 예컨대, 전극핀(21)은 음극의 극성을 가질 수 있고, 캔(10) 및 캡 플레이트(20)는 양극의 극성을 가질 수 있다. The cap plate 20 may include an electrode pin 21. The electrode pin 21 may be electrically connected to the electrode assembly 12 through the cap plate 20 and may protrude along the direction away from the cap plate 20. On the other hand, the first electrode plate of the electrode assembly 12 is connected to the electrode pin 21, the second electrode plate of the electrode assembly 12 is electrically connected to the cap plate 20, and the electrode pin 21 The cap plate 20 may have different polarities. Therefore, a gasket 23 may be provided between the electrode pin 21 and the cap plate 20 to prevent a short circuit between the electrode pin 21 and the cap plate 20. Meanwhile, the cap plate 20 and the can 10 may have the same polarity. For example, the electrode pin 21 may have the polarity of the negative electrode, and the can 10 and the cap plate 20 may have the polarity of the positive electrode.
제1 단자(30)는 캡 플레이트(20)의 일부 영역(20a) 상에 배치되며, 제2 단자(40)는 캡 플레이트(20)의 다른 영역(20b) 상에 배치될 수 있다. 일 실시예로서, 제1 단자(30)와 제2 단자(40)는 전극핀(21)을 중심으로 서로 반대편에 배치될 수 있다.The first terminal 30 may be disposed on the partial region 20a of the cap plate 20, and the second terminal 40 may be disposed on the other region 20b of the cap plate 20. In an embodiment, the first terminal 30 and the second terminal 40 may be disposed opposite to each other with respect to the electrode pin 21.
제1 단자(30)와 캡 플레이트(20)는 서로 다른 재질을 포함할 수 있다. 예컨대, 캡 플레이트(20)는 알루미늄 또는 알루미늄 합금으로 형성될 수 있고, 제1 단자(30)는 니켈로 형성될 수 있다. 이때, 이종(異種)소재로 제작되는 제1 단자(30)와 캡 플레이트(20) 간의 용접성을 향상시키기 위하여, 캡 플레이트(20) 상에는 결합편(22)이 더 포함될 수 있다. 일 예로, 결합편(22)은 제1 단자(30)와 동일한 소재로 제작될 수 있다.The first terminal 30 and the cap plate 20 may include different materials. For example, the cap plate 20 may be formed of aluminum or an aluminum alloy, and the first terminal 30 may be formed of nickel. At this time, in order to improve the weldability between the first terminal 30 and the cap plate 20 made of a dissimilar material, the coupling piece 22 may be further included on the cap plate 20. For example, the coupling piece 22 may be made of the same material as the first terminal 30.
제1 단자(30)와 제2 단자(40)는 이차 전지(1)를 보호회로모듈에 전기적으로 연결시킬 수 있다. 예컨대, 도 4에 도시하는 바와 같이, 제1, 2 단자(30, 40)는 보호회로모듈의 회로 기판(100)에 형성된 접속단(110)에 각각 용접되어, 이차 전지(1)는 보호회로모듈에 전기적으로 연결될 수 있다. 보호회로모듈에는 1개 이상의 이차 전지(1)가 전기적으로 연결될 수 있으며, 보호회로모듈의 회로 기판(100)에는 이차 전지(1)의 과충전, 과방전, 과전류, 단락, 역전압 등을 방지하기 위한 복수의 소자 들이 실장될 수 있다. The first terminal 30 and the second terminal 40 may electrically connect the secondary battery 1 to the protection circuit module. For example, as shown in FIG. 4, the first and second terminals 30 and 40 are welded to the connection ends 110 formed on the circuit board 100 of the protection circuit module, respectively, so that the secondary battery 1 is a protection circuit. It can be electrically connected to the module. One or more secondary batteries 1 may be electrically connected to the protection circuit module, and the overcharge, overdischarge, overcurrent, short circuit, reverse voltage, etc. of the secondary battery 1 may be prevented from the circuit board 100 of the protection circuit module. A plurality of devices may be mounted.
제1 단자(30)는 캡 플레이트(20)와 평행한 제1 파트(31), 제1 파트(31)으로부터 연장되고 제1 파트(31)에 대하여 절곡된 제2 파트(32), 및 제1 파트(31) 상에 형성된 보강부를 포함할 수 있다. 제2 파트(32)는 제1 파트(31)의 길이 방향과 상이한 방향으로 제1 파트(31)로부터 연장될 수 있다. 일 예로, 제2 파트(32)는 제1 파트(31)의 길이 방향과 수직한 방향으로 연장될 수 있다.The first terminal 30 includes a first part 31 parallel to the cap plate 20, a second part 32 extending from the first part 31 and bent relative to the first part 31, and a first part 31. It may include a reinforcing portion formed on one part (31). The second part 32 may extend from the first part 31 in a direction different from the length direction of the first part 31. For example, the second part 32 may extend in a direction perpendicular to the longitudinal direction of the first part 31.
제1 파트(31)는, 제2 파트(32)와 연결된 영역인 제1 영역(S1) 및 제1 영역(S1)과 인접하고 캡 플레이트(20)와 용접된 용접부(W)가 위치하는 제2 영역(S2)을 포함할 수 있는데, 이때 제1 영역(S1)과 제2 영역(S2) 경계에는 제2 파트(32)의 절곡 위치를 결정하고 제2 파트(32)의 절곡을 용이하게 하기 위한 제1 절곡홈(G1)이 형성될 수 있다. The first part 31 is a first part S1 which is an area connected to the second part 32 and a first part S1 which is adjacent to the first area S1 and is welded with the cap plate 20. It may include a second area (S2), wherein the bending position of the second part 32 is determined at the boundary between the first area (S1) and the second area (S2) and the bending of the second part 32 is easy. The first bent groove G1 may be formed.
또한, 제1 파트(31)에 형성된 보강부는 제1 영역(S1)과 제2 영역(S2)에 걸쳐 연속적으로 형성되어, 이차 전지(1)의 제조 공정 중에 제1 단자(30)의 형상이 변하는 것을 방지할 수 있다. 일 예로, 보강부는 캡 플레이트(20)의 길이 방향과 나란한 제1 파트(31)의 가장자리들 중, 제2 파트(32)와 반대측에 위치하는 가장자리가 제1 파트(31) 상으로 접힌 접힘부(33)일 수 있다. In addition, the reinforcement part formed in the first part 31 is continuously formed over the first area S1 and the second area S2, so that the shape of the first terminal 30 is changed during the manufacturing process of the secondary battery 1. It can prevent the change. For example, the reinforcing part of the edges of the first part 31 parallel to the longitudinal direction of the cap plate 20, the edge located on the side opposite to the second part 32 is folded on the first part 31. (33).
제1 단자(30)는 지그 등에 의해 캡 플레이트(20) 상에 위치가 고정된 후, 제2 영역(S2)의 용접부(W)에 용접봉이 접하여 용접을 수행함으로써, 캡 플레이트(20) 상에 용접된다. 용접이 완료된 후에는 제1 단자(30)를 고정하던 지그가 제거되는데, 이때, 제1 단자(30)는 약 0.1T 정도의 얇은 두께를 가지므로, 지그에 포함된 자석 등에 의해 제1 영역(S1)이 쉽게 들림으로써, 제1 파트(31)에 굴곡 등이 발생할 수 있다. 특히, 제1 절곡홈(G1)이 형성된 영역에서 제1 파트(31)의 폭이 최소가 되므로, 제1 절곡홈(G1)을 따라 형성되는 가상선(BL)을 기준으로 제1 영역(S1)이 상부 방향으로 휘어지거나 꺾일 수 있으며, 이에 의해 제2 파트(32)의 위치가 보호회로모듈의 회로 기판(100)에 형성된 접속단(110)과 정렬되지 않고 위치가 틀어져, 접속단(110)과의 용접시 용접 불량 등이 발생할 수 있다. After the first terminal 30 is fixed on the cap plate 20 by a jig or the like, a welding rod is brought into contact with the welding portion W of the second region S2 to perform welding on the cap plate 20. Are welded. After the welding is completed, the jig fixing the first terminal 30 is removed. At this time, since the first terminal 30 has a thin thickness of about 0.1T, the first region 30 may be formed by a magnet or the like included in the jig. As S1) is easily heard, bending or the like may occur in the first part 31. In particular, since the width of the first part 31 is minimized in the region where the first bending groove G1 is formed, the first region S1 based on the imaginary line BL formed along the first bending groove G1. ) May be bent or bent upwards, whereby the position of the second part 32 is not aligned with the connection end 110 formed on the circuit board 100 of the protection circuit module, and thus the position is displaced. ), Welding defects may occur.
그러나, 제1 파트(31)의 가장자리에 접힘부(33)가 형성된 경우는, 가상선(BL)을 기준으로 제1 영역(S1)이 상부 방향으로 휘어지거나 꺾이는 것을 방지할 수 있으며, 이에 의해 제2 파트(32)와 접속단(110) 간의 정렬이 유지되어 이차 전지(1)를 포함하는 모듈의 제조 효율이 향상될 수 있다.However, when the folded portion 33 is formed at the edge of the first part 31, the first region S1 can be prevented from bending or bending upward based on the imaginary line BL. Alignment between the second part 32 and the connection end 110 may be maintained to improve manufacturing efficiency of the module including the secondary battery 1.
한편, 접힘부(33)의 끝단과 용접부(W) 간의 제1 거리(D1)는 0.5㎜ 내지 1㎜일 수 있다. 여기서 제1 거리(D1)는 캡 플레이트(20)의 길이 방향과 수직한 방향으로, 접힘부(33)의 끝단에서부터 용접부(W)의 최외곽 영역까지 측정된 최단 거리를 의미한다.On the other hand, the first distance (D1) between the end of the folded portion 33 and the welding portion (W) may be 0.5mm to 1mm. The first distance D1 refers to the shortest distance measured from the end of the folded portion 33 to the outermost region of the weld portion W in a direction perpendicular to the longitudinal direction of the cap plate 20.
상기 제1 거리(D1)가 1㎜ 보다 크면, 용접봉의 위치가 접힘부(33)가 형성된 제1 파트(31)의 가장자리와 반대측의 가장자리에 근접하거나, 반대측의 가장자리와 접함으로써 과용접, 용접 터짐, Burn 등의 용접 불량이 발생할 수 있다. 반면에, 상기 제1 거리(D1)가 0.5㎜ 보다 작으면, 두께의 증가에 의해 상대적으로 저항이 감소된 접힘부(33)로 무효 전류가 많이 흐르게 되어 용접 효율이 감소하며, 접힘부(33)와 용접봉이 맞닿을 수 있고 이에 의해 역시 용접 불량이 발생할 수 있다.When the first distance D1 is larger than 1 mm, the welding rod is positioned close to the edge of the first part 31 on which the fold portion 33 is formed, or close to the edge of the opposite side, or over-welded and welded. Poor welding, such as burn, may occur. On the other hand, if the first distance D1 is smaller than 0.5 mm, a large amount of reactive current flows to the folded portion 33 having reduced resistance due to an increase in thickness, thereby reducing the welding efficiency, and the folded portion 33 ) And the electrode can be in contact with each other, thereby also causing a poor welding.
또한, 캡 플레이트(20)의 길이 방향과 수직한 접힘부(33)의 폭(L)은 0.4㎜ 내지 0.7㎜일 수 있다. 접힘부(33)의 폭(L)이 0.7㎜ 보다 커지면, 용접시 접힘부(33)의 끝단과 용접봉 간의 거리가 가까워 짐에 따라, 무효 전류의 증가 등에 의해 용접 불량이 발생할 가능성이 증가한다. 반면에, 접힘부(33)의 폭(L)이 0.4㎜ 보다 작으면, 접힘부(33)를 형성하기 곤란해지고 제1 영역(S1)이 상부 방향으로 휘어지거나 꺾이는 것을 효과적으로 방지하기 어렵다. In addition, the width L of the folded portion 33 perpendicular to the longitudinal direction of the cap plate 20 may be 0.4 mm to 0.7 mm. When the width L of the folded portion 33 is larger than 0.7 mm, as the distance between the tip of the folded portion 33 and the welding rod becomes closer during welding, the likelihood of welding failure due to an increase in reactive current increases. On the other hand, when the width L of the folded portion 33 is smaller than 0.4 mm, it is difficult to form the folded portion 33 and it is difficult to effectively prevent the first region S1 from bending or bending upward.
제2 단자(40)는 캡 플레이트(20) 상에 배치되며, 전극핀(21)과 전기적으로 연결될 수 있다. 제2 단자(40)는 전극핀(21)과 접속하는 제1 전극 탭(41), 캡 플레이트(20)의 길이 방향을 따라 제1 전극 탭(41)과 상호 이격된 제2 전극 탭(42), 및 제1, 2 전극 탭(41, 42) 사이에 위치하는 온도 소자(45)를 포함할 수 있다. 온도 소자(45)의 양 단(45a, 45b)은 각각 제1 전극 탭(41) 및 제2 전극 탭(42)과 용접 등의 의해 접속될 수 있다. The second terminal 40 is disposed on the cap plate 20 and may be electrically connected to the electrode pin 21. The second terminal 40 has a first electrode tab 41 connected to the electrode pin 21 and a second electrode tab 42 spaced apart from the first electrode tab 41 along the length of the cap plate 20. ) And a temperature element 45 positioned between the first and second electrode tabs 41 and 42. Both ends 45a and 45b of the temperature element 45 may be connected to the first electrode tab 41 and the second electrode tab 42 by welding or the like, respectively.
제2 전극 탭(42)은 캡 플레이트(20)와 평행한 제1 파트(42a), 제1 파트(42a)로부터 연장되어 절곡된 제2 파트(42b)를 포함하며, 제1 파트(42a)는 제2 절곡홈(G2)을 포함할 수 있다. 제2 절곡홈(G2)은 제2 파트(42b)가 연장되는 위치에 형성되어 제2 파트(42b)의 절곡 위치를 결정하고 제2 파트(42b)의 절곡을 용이하게 할 수 있다. 제2 파트(42b)는 보호회로모듈의 회로 기판(100)에 형성된 접속단(110)과 용접 등을 통해 접속될 수 있다.The second electrode tab 42 includes a first part 42a parallel to the cap plate 20, a second part 42b extending from and bent from the first part 42a, and the first part 42a. May include a second bending groove G2. The second bending groove G2 may be formed at a position where the second part 42b extends to determine the bending position of the second part 42b and to facilitate bending of the second part 42b. The second part 42b may be connected to the connection end 110 formed on the circuit board 100 of the protection circuit module through welding or the like.
제1 절연 테이프(50)는 제2 단자(40)와 캡 플레이트(20) 사이에 배치되어, 제2 단자(40)와 베어 셀(B)의 외측면 간의 단락을 방지할 수 있다.The first insulating tape 50 may be disposed between the second terminal 40 and the cap plate 20 to prevent a short circuit between the second terminal 40 and the outer surface of the bare cell B. FIG.
일 예로, 제1 절연 테이프(50)는, 제2 단자(40)와 중첩되는 캡 플레이트(20)의 다른 영역(20b)을 커버하는 제1 절연부(51), 제1 절연부(51)와 연속적으로 이루어지고 캔(10)의 네 개의 측면 중 서로 대향하는 두 개의 측면(11)들 중 일부를 각각 커버하는 제2 절연부(52)와 제3 절연부(53)를 포함할 수 있다. 한편, 베어 셀(B)과 마주하는 제1 절연 테이프(50)의 내측면은 접착력을 가져 캡 플레이트(20) 및 캔(10)에 부착될 수 있다. 이와 같은 제1 절연 테이프(50)는 이차 전지(1)의 두께 증가를 방지하기 위하여, 얇은 두께를 가지는 폴리에틸렌테레프탈레이트(thin polyethyleneterephthalate (PET)) 필름 등으로 제작될 수 있다.For example, the first insulation tape 50 may include a first insulation portion 51 and a first insulation portion 51 that cover another region 20b of the cap plate 20 overlapping the second terminal 40. And a second insulator 52 and a third insulator 53 which are continuous with each other and cover some of the two sides 11 facing each other among the four sides of the can 10. . On the other hand, the inner surface of the first insulating tape 50 facing the bare cell (B) may have an adhesive force and may be attached to the cap plate 20 and the can 10. The first insulating tape 50 may be made of a thin polyethyleneterephthalate (PET) film having a thin thickness to prevent an increase in the thickness of the secondary battery 1.
제2 절연 테이프(60)는 제1 절연 테이프(50)의 제1 절연부(51)와 제2 단자(40) 사이에 배치될 수 있다. 제2 절연 테이프(60)는 제1 절연 테이프(50) 보다 두껍게 형성될 수 있다. 따라서, 제2 단자(40) 등에 의해 제1 절연부(51)에 찢어짐 등이 발생하는 것을 방지하고, 제1 절연부(51)에 찢어짐 등이 발생 하더라도 제2 단자(40)와 캡 플레이트(20) 간에 단락이 발생하는 것을 방지할 수 있다. The second insulating tape 60 may be disposed between the first insulating portion 51 and the second terminal 40 of the first insulating tape 50. The second insulating tape 60 may be formed thicker than the first insulating tape 50. Therefore, the second terminal 40 and the like prevent the occurrence of the tear in the first insulating portion 51, and even if the tear occurs in the first insulating portion 51, the second terminal 40 and the cap plate ( 20) Short circuit can be prevented from occurring.
제2 절연 테이프(60)는 제1 절연 테이프(50)를 향하는 면과 제2 단자(40)를 향하는 면 중 적어도 어느 하나에 구비된 접착 물질을 포함할 수 있다. 일 실시예로, 제2 절연 테이프(60)는 제1 절연 테이프(50)와 마주보는 면이 접착력을 갖는 단면 접착 테이프일 수 있다. 또 다른 실시예로, 제2 절연 테이프(60)는 제1 절연 테이프(50)와 마주보는 면과 제2 단자(40)와 마주보는 면이 모두 접착력을 갖는 양면 접착 테이프(double-sided adhesive tape)일 수 있다.The second insulating tape 60 may include an adhesive material provided on at least one of a surface facing the first insulating tape 50 and a surface facing the second terminal 40. In an embodiment, the second insulating tape 60 may be a single-sided adhesive tape having an adhesive force on a surface facing the first insulating tape 50. In another embodiment, the second insulating tape 60 is a double-sided adhesive tape having an adhesive force on both a surface facing the first insulating tape 50 and a surface facing the second terminal 40. May be).
고정 부재(70)는 베어 셀(B)로부터 제2 단자(40)가 분리 또는 탈락되는 것을 방지하도록 제2 단자(40)를 커버할 수 있다. 구체적으로, 제2 단자(40)의 제1 전극 탭(41)은 전극핀(21)에 직접 용접되면서 베어 셀(B)과 결합될 수 있으나, 제2 전극 탭(42)은 그 위치가 고정되지 않을 수 있다. 따라서, 고정 부재(70)가 제2 단자(40)를 커버하도록 배치됨으로써, 제2 단자(40)가 베어 셀(B)로부터 탈락되거나 제2 단자(40)가 움직이면서 베어 셀(B)의 외측면 등과 단락되는 것을 방지할 수 있다. The fixing member 70 may cover the second terminal 40 to prevent the second terminal 40 from being separated or dropped from the bare cell B. Specifically, the first electrode tab 41 of the second terminal 40 may be coupled to the bare cell B while being directly welded to the electrode pin 21, but the position of the second electrode tab 42 is fixed. It may not be. Therefore, the fixing member 70 is disposed to cover the second terminal 40, so that the second terminal 40 is removed from the bare cell B or the second terminal 40 moves to move the outside of the bare cell B. Short circuits and the like can be prevented.
고정 부재(70)는 제1 절연 테이프(50)와 유사한 형상을 가질 수 있다. 고정 부재(70)는 제1 단자(30)를 커버하는 부분과 이와 연속적으로 형성되고, 제1 절연 테이프(50)의 제2 절연부(52) 및 제3 절연부(53)와 중첩하는 양 단부를 포함할 수 있다. 고정 부재(70)는 플라스틱 사출물이나 접착 테이프일 수 있다. 일 예로, 고정 부재(70)가 접착 테이프인 경우, 이차 전지(1)의 두께 증가를 최소화할 수 있다.The fixing member 70 may have a shape similar to that of the first insulating tape 50. The fixing member 70 is formed in a portion covering the first terminal 30 and continuously, and overlaps with the second insulating portion 52 and the third insulating portion 53 of the first insulating tape 50. It may include an end. The fixing member 70 may be a plastic injection molding or an adhesive tape. For example, when the fixing member 70 is an adhesive tape, an increase in thickness of the secondary battery 1 may be minimized.
도 5는 도 3의 제1 단자의 변형예를 개략적으로 도시한 사시도이다.FIG. 5 is a perspective view schematically illustrating a modification of the first terminal of FIG. 3.
도 5의 제1 단자(30B)는 도 3에서 도시하고 설명한 제1 단자(도 3의 30)와 기본적인 구성이 동일하므로, 이하에서는 차이점만을 설명하도록 한다.Since the first terminal 30B of FIG. 5 has the same basic configuration as that of the first terminal 30 shown in FIG. 3 and described with reference to FIG. 3, only the differences will be described below.
도 5를 참조하면, 제1 단자(30B)의 제1 파트(31)는 서로 이격된 한 쌍의 용접부(W)들 사이에 제1 파트(31)를 관통하는 슬릿(34)을 포함할 수 있다. 슬릿(34)은 캡 플레이트(도 2의 20)의 길이 방향과 수직한 방향으로 용접부(W)의 지름보다 크게 연장될 수 있다.Referring to FIG. 5, the first part 31 of the first terminal 30B may include a slit 34 passing through the first part 31 between a pair of welded portions W spaced apart from each other. have. The slit 34 may extend larger than the diameter of the weld portion W in a direction perpendicular to the length direction of the cap plate 20 of FIG. 2.
슬릿(34)은 한 쌍의 용접부(W)들 사이에 전기 저항 용접을 실시할 때, 제1 파트(31)를 통해 흐르는 누설 전류를 감소시킨다. 즉, 한 쌍의 용접부(W)들 사이에 슬릿(34)이 형성됨으로써, 제1 파트(31)를 통해 흐르는 누설 전류의 경로가 길어지게 되는바, 누설 전류의 크기가 작아지고, 이에 의해 용접성이 향상될 수 있으며, 누설전류로 인한 터짐이나 그을음을 효과적으로 방지할 수 있다. 일 예로, 슬릿(34)의 중심을 지나는 슬릿(34)의 세로 폭은 1㎜ 내지 3㎜, 슬릿(34)의 가로 폭은 0.5㎜ 내지 1㎜일 수 있으나, 이에 한정되는 것은 아니다. The slit 34 reduces the leakage current flowing through the first part 31 when performing electrical resistance welding between the pair of welds W. FIG. That is, by forming the slit 34 between the pair of welding portions (W), the path of the leakage current flowing through the first part 31 is long, the magnitude of the leakage current is reduced, thereby weldability This can be improved and effectively prevents bursting or sooting due to leakage current. For example, the vertical width of the slit 34 passing through the center of the slit 34 may be 1 mm to 3 mm, and the horizontal width of the slit 34 may be 0.5 mm to 1 mm, but is not limited thereto.
한편, 한 쌍의 용접부(W)들과 슬릿(34) 간의 제2 거리(D2)는 각각 0.5㎜ 내지 1㎜일 수 있다. 제2 거리(D2)가 1㎜ 보다 크면, 한 쌍의 용접부(W)들 사이의 거리가 증가함에 따라 용접 효율이 감소할 수 있고, 제2 거리(D2)가 0.5㎜ 보다 작으면, 슬릿(34)과 용접봉이 맞닿아 과용접, 터짐 등의 불량이 발생할 수 있다.Meanwhile, the second distance D2 between the pair of welding portions W and the slits 34 may be 0.5 mm to 1 mm, respectively. If the second distance D2 is greater than 1 mm, the welding efficiency may decrease as the distance between the pair of welds W increases, and if the second distance D2 is smaller than 0.5 mm, the slit ( 34) contact with welding rod may lead to over-welding and bursting.
도 6은 도 1의 이차 전지의 제1 단자의 다른 예를 개략적으로 도시한 사시도이고, 도 7은 도 6의 I-I' 단면을 개략적으로 도시한 단면도이다.6 is a perspective view schematically illustrating another example of the first terminal of the rechargeable battery of FIG. 1, and FIG. 7 is a cross-sectional view schematically illustrating a cross-sectional view taken along line II ′ of FIG. 6.
도 6 및 도 7을 참조하면, 제1 단자(30C)는 제1 파트(31), 제1 파트(31)로부터 연장되고 제1 파트(31)에 대하여 절곡된 제2 파트(32), 및 제1 파트(31) 상에 형성된 보강부를 포함할 수 있다. 제2 파트(31)는 일 예로, 제1 파트(31)의 길이 방향과 수직한 방향으로 연장될 수 있다.6 and 7, the first terminal 30C extends from the first part 31, the second part 32 extending from the first part 31 and bent relative to the first part 31, and It may include a reinforcing portion formed on the first part 31. For example, the second part 31 may extend in a direction perpendicular to the longitudinal direction of the first part 31.
제1 파트(31)는, 제2 파트(32)와 연결된 영역인 제1 영역(S1) 및 제1 영역(S1)과 인접하는 제2 영역(S2)을 포함할 수 있는데, 이때 보강부는 제1 영역(S1)과 제2 영역(S2)에 걸쳐 연속적으로 형성될 수 있다. 또한, 제1 영역(S1)과 제2 영역(S2) 경계에는 제2 파트(32)의 절곡 위치를 결정하고 제2 파트(32)의 절곡을 용이하게 하기 위한 제1 절곡홈(G1)이 형성될 수 있다. The first part 31 may include a first region S1, which is an area connected to the second part 32, and a second region S2, which is adjacent to the first area S1, wherein the reinforcement part is formed in the first part S1. It may be continuously formed over the first region S1 and the second region S2. In addition, at the boundary between the first area S1 and the second area S2, a first bending groove G1 for determining the bending position of the second part 32 and facilitating bending of the second part 32 is provided. Can be formed.
일 예로, 보강부는 제1 파트(31)의 일부가 상측 방향 즉, 캡 플레이트(도 2의 20)와 반대 방향으로 볼록하게 돌출된 융기부(35)일 수 있다. 융기부(35)가 캡 플레이트(도 2의 20)를 향하도록 돌출된 경우와 비교할 때, 융기부(35)가 상측으로 돌출되면, 제1 영역(S1)이 제1 절곡홈(G1)을 따라 형성되는 가상선(BL)을 기준으로 상부 방향으로 휘어지거나 꺾이는 현상을 더욱 효과적으로 방지할 수 있다.For example, the reinforcement part may be a ridge 35 in which a part of the first part 31 is convexly protruded in an upward direction, that is, in a direction opposite to the cap plate 20 of FIG. 2. Compared to the case where the ridge 35 protrudes toward the cap plate 20 (FIG. 2), when the ridge 35 protrudes upward, the first region S1 opens the first bent groove G1. It is possible to more effectively prevent the phenomenon of bending or bending in an upward direction based on the virtual line BL formed accordingly.
즉, 융기부(35)가 상측으로 돌출되므로, 융기부(35)의 높이(T2)는 제1 파트(31)의 두께(T1)보다 크게 형성된다. 융기부(35)의 높이는 제1 파트(31)의 저면에서부터 융기부(35)의 가장 높은 지점 까지 측정한 길이를 의미한다. 한편, 융기부(35)는 제1 파트(31)의 일부를 드로잉 가공 공정에 의해 형성할 수 있는데, 융기부(35)의 높이(T2)가 제1 파트(31)의 두께(T1)의 2배 보다 커지면, 융기부(35)에 찢어짐 등이 발생할 수 있는바, 융기부(35)의 높이(T2)는 제1 파트(31)의 두께(T1)의 2배 이하로 형성될 수 있다. That is, since the ridge 35 protrudes upward, the height T2 of the ridge 35 is larger than the thickness T1 of the first part 31. The height of the ridge 35 means the length measured from the bottom of the first part 31 to the highest point of the ridge 35. On the other hand, the ridge 35 may form a part of the first part 31 by a drawing process, wherein the height T2 of the ridge 35 is equal to the thickness T1 of the first part 31. When larger than 2 times, tearing may occur in the ridge 35, and the height T2 of the ridge 35 may be formed to be less than twice the thickness T1 of the first part 31. .
이상에서는 도면에 도시된 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 당해 기술 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 다른 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호 범위는 첨부된 특허청구범위의 기술적 사상에 의하여 정해져야 할 것이다.Although the above description has been made with reference to the exemplary embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (17)

  1. 캔;Cans;
    상기 캔의 내부에 수용된 전극 조립체;An electrode assembly housed inside the can;
    상기 캔을 밀봉하는 캡 플레이트; 및A cap plate for sealing the can; And
    상기 캡 플레이트 상에 위치하고, 상기 캡 플레이트와 전기적으로 연결된 제1 단자;를 포함하고,A first terminal disposed on the cap plate and electrically connected to the cap plate;
    상기 제1 단자는, 상기 캡 플레이트와 나란한 제1 파트, 상기 제1 파트로부터 연장되고 상기 제1 파트에 대하여 절곡된 제2 파트, 및 상기 제1 파트 상에 형성된 보강부를 포함하고,The first terminal includes a first part parallel to the cap plate, a second part extending from the first part and bent relative to the first part, and a reinforcement part formed on the first part,
    상기 제1 파트는, 상기 제2 파트와 연결된 제1 영역, 상기 제1 영역과 인접하고 상기 캡 플레이트와 용접된 용접부가 위치하는 제2 영역을 포함하며,The first part may include a first area connected to the second part, a second area adjacent to the first area, and a welding part welded to the cap plate is located.
    상기 보강부는 상기 제1 영역과 상기 제2 영역에 걸쳐 연속적으로 형성된 이차 전지.The reinforcement part is a secondary battery continuously formed over the first area and the second area.
  2. 제1항에 있어서,The method of claim 1,
    상기 제2 파트는 상기 제1 파트의 길이 방향과 상이한 방향으로 연장된 이차 전지.The second part extends in a direction different from a length direction of the first part.
  3. 제2항에 있어서,The method of claim 2,
    상기 제1 영역과 상기 제2 영역의 경계에는 제1 절곡 홈이 형성된 이차 전지.A secondary battery having a first bent groove formed at a boundary between the first region and the second region.
  4. 제2항에 있어서,The method of claim 2,
    상기 보강부는 상기 캡 플레이트의 길이 방향과 나란한 상기 제1 파트의 가장자리들 중, 상기 제2 파트와 반대측에 위치하는 가장자리가 상기 제1 파트 상으로 접힌 접힘부인 이차 전지.The reinforcement part is a secondary battery of the edges of the first part parallel to the longitudinal direction of the cap plate, the edge located on the side opposite to the second part is a folded part folded on the first part.
  5. 제4항에 있어서,The method of claim 4, wherein
    상기 접힘부의 끝단과 상기 용접부 간의 최단 거리는 0.5㎜ 내지 1㎜인 이차 전지.The shortest distance between the end of the folded portion and the welding portion is 0.5mm to 1mm.
  6. 제4항에 있어서,The method of claim 4, wherein
    상기 캡 플레이트의 길이 방향과 수직한 상기 접힘부의 폭은 0.4㎜ 내지 0.7㎜인 이차 전지.A secondary battery having a width of the folded portion perpendicular to the longitudinal direction of the cap plate is 0.4mm to 0.7mm.
  7. 제4항에 있어서,The method of claim 4, wherein
    상기 용접부는 서로 이격된 한 쌍의 용접부들을 포함하고, The weld includes a pair of welds spaced apart from each other,
    상기 제1 파트는 상기 한 쌍의 용접부들 사이에 상기 제1 파트를 관통하는 슬릿을 포함하는 이차 전지.The first part includes a slit penetrating the first part between the pair of welding parts.
  8. 제7항에 있어서,The method of claim 7, wherein
    상기 한 쌍의 용접부들과 상기 슬릿 간의 거리는 각각 0.5㎜ 내지 1㎜인 이차 전지.The secondary battery has a distance between the pair of welding parts and the slit, respectively, 0.5 mm to 1 mm.
  9. 제2항에 있어서,The method of claim 2,
    상기 보강부는, 상기 제1 파트의 일부가 상기 캡 플레이트와 반대 방향으로 볼록하게 돌출된 융기부인 이차 전지.The reinforcement part is a secondary battery in which a part of the first part is a raised part protrudingly convex in a direction opposite to the cap plate.
  10. 제9항에 있어서,The method of claim 9,
    상기 융기부의 높이는 상기 제1 파트의 두께보다 크고, 상기 제1 파트의 두께의 2배 이하인 이차 전지.The height of the ridge is greater than the thickness of the first part, the secondary battery is less than twice the thickness of the first part.
  11. 제1항에 있어서,The method of claim 1,
    상기 제1 단자와 상기 캡 플레이트는 서로 상이한 재질로 형성되고,The first terminal and the cap plate is formed of a different material from each other,
    상기 이차 전지는, 상기 제1 단자와 상기 캡 플레이트 사이에, 상기 제1 단자와 동일한 재질로 형성된 결합편을 더 포함하는 이차 전지.The secondary battery further includes a coupling piece formed of the same material as the first terminal between the first terminal and the cap plate.
  12. 제1항에 있어서, The method of claim 1,
    상기 캡 플레이트는 상기 전극 조립체와 전기적으로 연결된 전극핀을 포함하고, The cap plate includes an electrode pin electrically connected to the electrode assembly,
    상기 이차 전지는, 상기 캡 플레이트 상에 위치하고 상기 제1 단자와 이격된 제2 단자 및, 상기 캡 플레이트와 상기 제2 단자 사이의 제1 절연 테이프를 더 포함하는 이차 전지.The secondary battery further includes a second terminal disposed on the cap plate and spaced apart from the first terminal, and a first insulating tape between the cap plate and the second terminal.
  13. 제12항에 있어서,The method of claim 12,
    상기 제1 절연 테이프는, 상기 제2 단자와 중첩하는 상기 캡 플레이트의 영역을 커버하는 제1 절연부, 상기 제1 절연부와 연속적으로 이루어지고 상기 캔의 네 개의 측면 중 서로 대향하는 두 개의 측면들 중 일부를 각각 커버하는 제2 절연부와 제3 절연부를 포함하는 이차 전지.The first insulating tape may include a first insulating part covering an area of the cap plate overlapping the second terminal, and two side surfaces which are continuously formed with the first insulating part and which face each other among four sides of the can. A secondary battery comprising a second insulating portion and a third insulating portion respectively covering some of them.
  14. 제13항에 있어서,The method of claim 13,
    상기 이차 전지는, 상기 제1 절연부와 상기 제2 단자 사이에 배치된 제2 절연 테이프를 더 포함하는 이차 전지.The secondary battery further includes a second insulating tape disposed between the first insulating portion and the second terminal.
  15. 제14항에 있어서,The method of claim 14,
    상기 제2 절연 테이프의 두께는 상기 제1 절연 테이프의 두께보다 두꺼운 이차 전지.The thickness of the second insulating tape is a secondary battery thicker than the thickness of the first insulating tape.
  16. 제12항에 있어서,The method of claim 12,
    상기 제2 단자는, 상기 전극핀과 접속하는 제1 전극 탭, 상기 캡 플레이트의 길이 방향을 따라 상기 제1 전극 탭과 상호 이격된 제2 전극 탭, 및 상기 제1 전극 탭과 상기 제2 전극 탭 사이에 위치하고, 상기 제1 전극 탭 및 상기 제2 전극 탭과 접속된 온도 소자를 포함하는 이차 전지.The second terminal may include a first electrode tab connected to the electrode pin, a second electrode tab spaced apart from the first electrode tab along a length direction of the cap plate, and the first electrode tab and the second electrode. A secondary battery comprising a temperature element disposed between the tabs and connected to the first electrode tab and the second electrode tab.
  17. 제12항에 있어서,The method of claim 12,
    상기 이차 전지는, 상기 제2 단자를 커버하며 상기 제2 단자를 고정시키는 고정 부재를 더 포함하는 이차 전지.The secondary battery further includes a fixing member covering the second terminal and fixing the second terminal.
PCT/KR2017/012640 2016-11-29 2017-11-09 Secondary battery WO2018101634A1 (en)

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