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WO2018199438A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2018199438A1
WO2018199438A1 PCT/KR2018/001064 KR2018001064W WO2018199438A1 WO 2018199438 A1 WO2018199438 A1 WO 2018199438A1 KR 2018001064 W KR2018001064 W KR 2018001064W WO 2018199438 A1 WO2018199438 A1 WO 2018199438A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
terminal
connection
secondary battery
cap plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2018/001064
Other languages
English (en)
Korean (ko)
Inventor
장명재
곽승호
변상원
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung SDI Co Ltd
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 Samsung SDI Co Ltd filed Critical Samsung SDI Co Ltd
Publication of WO2018199438A1 publication Critical patent/WO2018199438A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • 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
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • 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
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a secondary battery.
  • a secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged.
  • a secondary battery is used in portable electronic devices such as mobile phones and camcorders. Large capacity batteries with dozens of cells connected are used as motor power sources for electric bicycles, electric scooters, hybrid cars, and electric cars.
  • Secondary batteries are manufactured in various shapes, and typical shapes include square, cylindrical, and pouch types, and an electrode assembly formed between a positive electrode and a negative electrode through a separator, which is an insulator, and an electrolyte together in a case. It is configured to receive and install a cap plate in the case. In addition, an electrode terminal is electrically connected to the electrode assembly, which is exposed or protruded to the outside through the cap plate.
  • the present invention provides a secondary battery capable of improving the welding quality between the safety vent and the connection tab.
  • a secondary battery includes an electrode assembly including a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode; A case accommodating the electrode assembly; A cap plate coupled to an upper portion of the case and electrically connected to the first electrode, and having a safety vent formed at one side thereof; A first electrode terminal formed through the cap plate; And a connection tab for electrically connecting the first electrode terminal and the safety vent, wherein a coupling protrusion is formed at the center of the safety vent, and a coupling hole is formed at the connection tab, to which the coupling protrusion is coupled. do.
  • connection tab and the safety vent may be electrically connected by welding the joint surface of the coupling protrusion and the coupling hole.
  • the safety vent is fixed to the cap plate; A break portion located inside the fixing portion and having a notch formed therein; An inverting part disposed inside the breaking part and formed of a inverting plate concave from the cap plate; And a coupling part disposed above the inversion part and formed thicker than a thickness of the inversion part, and to which the connection tab is coupled.
  • the coupling protrusion may be formed on an upper portion of the coupling portion.
  • connection tab may include a terminal connection part electrically connected to the first electrode terminal; A vent connection electrically connected to the safety vent; And a connection part connecting the terminal connection part and the vent connection part and formed to be inclined.
  • the coupling hole may be formed in the vent connection portion.
  • a notch may be formed in the terminal connection portion.
  • the display device may further include a first terminal plate coupled to the first electrode terminal protruding to an upper portion of the cap plate, and the first terminal plate may have a stepped portion to which the connection tab is coupled.
  • a first collector plate electrically connected to the first electrode wherein the first collector plate comprises: a first connection part connected to a first electrode uncoated part; And a first extension part bent at an upper end of the first connection part and formed in parallel with the cap plate, and one end of the first extension part may protrude upward to form a protrusion electrically connected to the cap plate.
  • a lower insulating member may be formed between the first electrode terminal and the first extension part.
  • a secondary battery according to an embodiment of the present invention includes a safety vent having a coupling protrusion and a connection tab having a coupling hole coupled to the coupling protrusion, and welding the coupling surface between the coupling protrusion and the coupling hole by butt welding. It will be possible to improve. Therefore, the secondary battery according to the present invention can reduce the welding defect, reduce the production cost and improve the reliability of the product.
  • FIG. 1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention.
  • FIG. 2 is a cross-sectional view illustrating a rechargeable battery taken along the line II ′ of FIG. 1.
  • FIG 3 is an enlarged cross-sectional view illustrating a safety vent in a rechargeable battery according to an exemplary embodiment of the present invention.
  • FIG. 4 is a perspective view of a safety vent according to an embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of a safety vent according to an embodiment of the present invention.
  • connection tab 6 is a plan view of a connection tab according to an embodiment of the present invention.
  • FIG. 7 and 8 are cross-sectional views illustrating an operating state of a safety vent in a rechargeable battery according to an exemplary embodiment of the present invention.
  • terms relating to spaces such as “beneath”, “below”, “lower”, “above”, and “upper” may be referred to as an element or Used for easy understanding of the feature and other elements or features. Terms related to this space are for easy understanding of the present invention according to various manufacturing processes or use conditions of the secondary battery, and are not intended to limit the present invention. For example, when the secondary battery of the figure is turned upside down, the element described as “lower” or “below” becomes “top” or “above.” Thus, “bottom” encompasses “top” or “bottom”.
  • FIG. 1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention.
  • FIG. 2 is a cross-sectional view illustrating a rechargeable battery taken along the line II ′ of FIG. 1.
  • 3 is an enlarged cross-sectional view illustrating a safety vent in a rechargeable battery according to an exemplary embodiment of the present invention.
  • 4 is a perspective view of a safety vent according to an embodiment of the present invention.
  • 5 is a cross-sectional view of a safety vent according to an embodiment of the present invention.
  • 6 is a plan view of a connection tab according to an embodiment of the present invention.
  • a secondary battery 100 may include an electrode assembly 110, a first current collecting plate 120, a second current collecting plate 130, and a first electrode terminal ( 140, a second electrode terminal 150, a case 160, a cap assembly 170, a safety vent 180, and a connection tab 190.
  • the electrode assembly 110 includes a first electrode 111, a second electrode 112, and a separator 113 interposed between the first electrode 111 and the second electrode 112.
  • the electrode assembly 110 may be formed by winding a laminate of the first electrode 111, the separator 113, and the second electrode 112 in a jelly-roll form.
  • the first electrode 111 may act as an anode
  • the second electrode 112 may act as a cathode.
  • the first electrode 111 is formed by applying a first electrode active material such as transition metal oxide to a first electrode current collector formed of a metal foil such as aluminum, and the first electrode uncoated portion is an area where the first active material is not coated. (111a).
  • the first electrode uncoated portion 111a serves as a passage for current flow between the first electrode 111 and the outside of the first electrode.
  • the second electrode 112 is formed by applying a second electrode active material such as graphite or carbon to a second electrode current collector formed of a metal foil such as copper or nickel, and is a region in which the second active material is not coated. And the non-coated portion 112a.
  • the second electrode uncoated portion 112a serves as a passage for current flow between the second electrode 112 and the outside of the second electrode.
  • the separator 113 is positioned between the first electrode 111 and the second electrode 112 to prevent a short and to allow movement of lithium ions.
  • the separator 113 may be made of polyethylene, polypropylene, or a composite film of polyethylene and polypropylene.
  • the first collector plate 120 is formed of a conductive material such as aluminum, and is in contact with the first electrode uncoated portion 111a protruding to one end of the electrode assembly 110, thereby electrically contacting the first electrode 111. Is connected.
  • the first current collecting plate 120 includes a first connection part 121 and a first extension part 122.
  • the first connection portion 121 is formed on one side of the electrode assembly 110, and is formed in a plate shape substantially in contact with the first electrode uncoated portion 111a.
  • the first connection portion 121 may be welded to the first electrode uncoated portion 111a.
  • the first extension part 122 is bent at an upper end of the first connection part 121 to extend along a lower portion of the cap plate 171 to be described later.
  • the first extension part 122 is formed in a direction perpendicular to the first connection part 121 and is formed in parallel with the cap plate 171.
  • a protrusion 123 is formed at one end of the first extension part 122, and the protrusion 123 is electrically connected to a lower portion of the cap plate 171.
  • the protrusion 123 may be welded to the cap plate 171 by ultrasonic welding, electric welding, arc welding, or the like. Accordingly, the cap plate 171 is electrically connected to the first electrode 111.
  • the second collector plate 130 is made of a conductive material such as nickel, and is in contact with the second electrode uncoated portion 112a protruding to the other end of the electrode assembly 110, thereby electrically contacting the second electrode 112. Connected.
  • the second collector plate 130 includes a second connection part 131 and a second extension part 132.
  • the second connection portion 131 is formed on the other side of the electrode assembly 110, and is formed in a plate shape substantially in contact with the second electrode uncoated portion 112a.
  • the second connection portion 131 may be welded to the second electrode uncoated portion 112a.
  • the second extension part 132 is bent at an upper end of the second connection part 131 to extend along a lower portion of the cap plate 171.
  • the second extension part 132 is formed in a direction perpendicular to the second connection part 131 and is formed parallel to the cap plate 171.
  • a terminal hole 133 is formed in the second extension part 132, and the second electrode terminal 150 is fitted into the terminal hole 133.
  • the first electrode terminal 140 is formed of a conductive material such as aluminum, and is coupled to the first current collector 120 to be electrically connected to the first electrode 111.
  • the first electrode terminal 140 includes a first terminal body 141 and a first terminal extension 142.
  • the first terminal body 141 passes through the cap plate 171, and an upper portion thereof is riveted to be fixed to the cap plate 171.
  • the first terminal extension part 142 extends in the horizontal direction from the bottom of the first terminal body 141 to be in close contact with the bottom surface of the cap plate 171. The first terminal extension 142 prevents the first terminal body 141 from coming off the cap plate 171.
  • the second electrode terminal 150 is formed of a conductive material such as nickel, and is electrically connected to the second electrode 112 by being combined with the second current collecting plate 130.
  • the second electrode terminal 150 includes a second terminal body 151 and a second terminal extension 152.
  • the second terminal body 151 penetrates through the cap plate 171, and an upper portion thereof is riveted to be fixed to the cap plate 171.
  • the second terminal extension part 152 extends in the horizontal direction from the bottom of the second terminal body 151 to be in close contact with the bottom surface of the cap plate 171.
  • the second terminal extension 152 prevents the second terminal body 151 from coming off the cap plate 151. Meanwhile, a portion of the second terminal body 151 connected to the lower portion of the terminal extension part 152 is inserted into the terminal hole 133 of the second current collecting plate 130 and electrically coupled thereto.
  • the case 160 is formed of a conductive metal such as aluminum, an aluminum alloy, or nickel plated steel, and includes an electrode assembly 110, a first current collector 120, a second current collector 130, and a first electrode terminal.
  • the 140 and the second electrode terminal 150 may have a substantially hexahedral shape in which an opening to which the second electrode terminal 150 is inserted and formed is formed.
  • the case 160 may act as one polarity, for example, an anode.
  • the cap assembly 170 is coupled to the top of the case 160.
  • the cap assembly 170 may include a cap plate 171, a stopper 172, a gasket 173, a first terminal plate 174, a second terminal plate 175, an upper insulating member 176, and a lower portion. Insulation member 177 is included.
  • the cap plate 171 seals the opening of the case 160 and may be formed of the same material as the case 160.
  • the cap plate 171 may be coupled to the case 160 by laser welding.
  • the cap plate 171 may have the same polarity as the case 160.
  • the cap plate 171 is formed with an electrolyte injection hole 171a for injecting an electrolyte and a vent hole 171b in which a safety vent 180 is formed.
  • the vent hole 171b may have a stepped surface 171c to couple the safety vent 180 relatively thinner than the thickness of the cap plate 171.
  • the electrolyte injection hole 171a is sealed with a stopper 172.
  • the gasket 173 is formed of an insulating material between each of the first electrode terminal 140 and the second electrode terminal 150 and the cap plate 171 to form the first electrode terminal 140 and the second electrode terminal 150. Seal between each and the cap plate 171. In addition, the gasket 173 is coupled between each of the first electrode terminal 140 and the second electrode terminal 150 and the cap plate 171 at the bottom of the cap plate 171. The gasket 173 prevents external moisture from penetrating the inside of the secondary battery 100 or prevents the electrolyte solution contained in the secondary battery 100 from flowing out.
  • the first terminal plate 174 and the second terminal plate 175 are coupled to each of the first electrode terminal 140 and the second electrode terminal 150.
  • the upper portions of the first and second electrode terminals 140 and 150 are riveted, respectively.
  • the first and second electrode terminals 140 and 150 are fixed to the first and second terminal plates 174 and 175.
  • the connection tab 190 to be described later is coupled to the first terminal plate 174. Therefore, the first terminal plate 174 is formed with a stepped portion 174a to which the connection tab 190 is coupled.
  • the upper insulating member 176 is positioned between the first and second terminal plates 174 and 175 and the cap plate 171 so that the first electrode terminal 140 and the second electrode terminal 150 are fitted therein, respectively. Is formed.
  • the upper insulating member 176 is in close contact with the cap plate 171 and the gasket 173 through the first and second terminal plates 174 and 175.
  • the upper insulating member 176 insulates the first electrode terminal 140 and the second electrode terminal 150 from the cap plate 171.
  • the lower insulating member 177 is formed between each of the first current collector plate 120 and the second current collector plate 130 and the cap plate 171, and thus the first current collector plate 120 and the second current collector plate 130. The occurrence of unnecessary short circuit between each and the cap plate 171 is prevented.
  • the lower insulating member 177 is formed between the first extension part 122 of the first current collecting plate 120 and the cap plate 171.
  • the lower insulating member 177 is positioned between the first terminal extension part 142 of the first electrode terminal 140 and the first extension part 122 of the first current collecting plate 120. Therefore, the first electrode terminal 140 does not directly contact the first current collecting plate 120 by the lower insulating member 177.
  • the lower insulating member 177 is formed between the second extension part 132 of the second current collecting plate 130 and the cap plate 171.
  • the safety vent 180 is coupled to the vent hole 171b of the cap plate 171. Specifically, the safety vent 180 is coupled across the stepped surface 171c of the vent hole 171b to seal the vent hole 171b.
  • the safety vent 180 is formed of the same material as the cap plate 171 and is electrically connected to the cap plate 171. In addition, the safety vent 180 breaks when the internal pressure of the secondary battery 100 reaches a set breaking pressure due to overcharging or overdischarging, so that the vent hole 171b is opened, and thus the secondary battery 100 is opened. Prevent explosion.
  • the safety vent 180 may include a fixing part 181, a breaking part 182, an inverting part 183, and a coupling part 184.
  • the fixing part 181 is an edge portion of the safety vent 180 and is coupled to the stepped surface 171c of the vent hole 171b.
  • the fixing part 181 may be fixed to the step surface 171c by welding.
  • the breaking part 182 is positioned inside the fixing part 181 and is broken when the internal pressure of the secondary battery 100 is higher than the set breaking pressure. Therefore, the notch 182a is formed on the lower surface of the breaker 182, so that the safety vent 180 may be easily broken.
  • the breaking pressure of the safety vent 180 may be set to the thickness and shape of the breaking part 182 and the concave degree of the inverting part 183.
  • the inverting portion 183 is positioned inside the breaker 182, that is, at the center of the safety vent 180, and is formed to be convex toward the inside of the case 160.
  • the inverting portion 183 is formed of a reversing plate formed concave than the surface of the cap plate 171. Therefore, when the internal pressure of the secondary battery 100 is higher than the set reference pressure, the inverting portion 183 is inverted to be convex upward. In addition, when the internal pressure of the secondary battery 100 is higher than the breaking pressure, the breaking part 182 is broken.
  • a coupling portion 184 having a relatively thick thickness is formed on the upper portion of the inverting portion 183 compared to the thickness of the safety vent 180.
  • a connection tab 190 is coupled to the coupling portion 184 to electrically connect the first electrode terminal 120 to the first electrode 111. Since the coupling part 184 is welded with the connection tab 190, the coupling part 184 has a thickness such that the safety vent 180 is not damaged when the coupling part 184 and the connection tab 190 are welded.
  • a coupling protrusion 184a is formed at an upper portion of the coupling portion 184. The connection tab 190 is fitted to the coupling protrusion 184a, and a joint surface of the coupling protrusion 184a and the connection tab 190 is welded.
  • the thickness of the coupling protrusion 184a protrudes from the thickness of the connection tab 190. Therefore, the connection tab 190 coupled to the coupling protrusion 184a forms the same plane as the upper surface of the coupling protrusion 184a.
  • connection tab 190 is connected between the first terminal plate 174 and the safety vent 180 to electrically connect the first terminal plate 174 and the safety vent 180. Accordingly, the connection tab 190 electrically connects the first electrode terminal 120 to the first electrode 111. Specifically, the first electrode terminal 120 is connected to the first electrode through the first terminal plate 174, the connection tab 190, the safety vent 180, the cap plate 171, and the first current collecting plate 120. 111) is electrically connected.
  • the connection tab 190 may include a terminal connection part 191 electrically connected to the first terminal plate 174, a vent connection part 192 electrically connected to the safety vent 180, and the terminal connection part 191. And a connecting portion 193 for electrically connecting the vent connecting portion 192.
  • the connection tab 190 may be formed of a metal such as aluminum or an aluminum alloy.
  • the terminal connecting portion 191 has a substantially rectangular plate shape, one end of which is electrically connected to the stepped portion 174a of the first terminal plate 174.
  • the terminal connecting portion 191 may be welded to the terminal portion 174a by ultrasonic welding, resistance welding, spot welding, or the like.
  • the vent connection 192 is coupled to and electrically connected to the coupling part 184 of the safety vent 180.
  • a coupling hole 192a is formed in the vent connection part 192, and a coupling protrusion 184a of the coupling part 184 is coupled to the coupling hole 192a.
  • the upper surface of the vent connecting portion 192 and the coupling protrusion 184a forms the same plane. At this time, when the joining surface of the joining protrusion 184a and the joining hole 192a is welded, a part of the joining protrusion 184a and the joining hole 192a around the joining surface are melted and melted.
  • the mechanical coupling strength between the safety vent 180 and the connection tab 190 is improved, and this welding method is called butt welding.
  • Such butt welding improves the welding quality of the coupling part 184 and the connection tab 190.
  • the overlapping welding for placing the connection tab on the upper part of the coupling part and welding the upper part of the connection tab and the lower part of the coupling part is performed, but the overlapping welding tends to have a relatively high defect rate. Therefore, in the present invention, the coupling hole 192a is formed in the connection tab 190 and the coupling protrusion 184a is formed in the safety vent 180, and the coupling protrusion 184a is coupled to the coupling hole 192a. By welding the joint surface, the welding quality can be improved.
  • connection part 193 connects the terminal connection part 191 and the vent connection part 192 and is formed to be inclined. Because the first terminal plate 174 to which the terminal connecting portion 191 is coupled is formed to protrude from the cap plate 171 to have a relatively high height, and the safety vent 180 to which the vent connecting portion 192 is coupled. Is because it is formed concave from the cap plate 171 and the height is relatively low. In addition, the notch 193a is formed at the connection portion 193, and when the safety vent 180 is broken, the connection tab 190 may be broken together.
  • the secondary battery 100 has a safety vent 180 having a coupling protrusion 184a and a connection tab 190 having a coupling hole 192a coupled to the coupling protrusion 184a. ), And by butt welding the coupling surface between the coupling protrusion 184a and the coupling hole 192a, the welding quality can be improved. Therefore, the secondary battery 100 according to the present invention can reduce the welding defect, reduce the production cost and improve the reliability of the product.
  • FIGS. 7 and 8 are cross-sectional views illustrating an operating state of a safety vent in a rechargeable battery according to an exemplary embodiment of the present invention. Referring to FIGS. 7 and 8, a method of operating a safety vent in a rechargeable battery according to an exemplary embodiment will be described.
  • the inverting portion 183 of the safety vent 180 is inverted to be convex upward.
  • the vent connection unit 192 of the connection tab 190 rises upward and the connection unit 193 is formed to be substantially flat.
  • the breaking part 182 of the safety vent 180 is broken to open the vent hole 171b.
  • the notch 182a is formed in the break portion 182, break is easy.
  • the connection tab 190 may be broken together by the notch 193a formed in the connection unit 193.
  • the safety vent 180 is broken, the electrical connection between the cap plate 171 and the first terminal plate 174 is broken, so that the electrical connection between the first electrode terminal 120 and the first electrode 111 is lost. The connection will be lost. Therefore, the current of the secondary battery 100 is cut off.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention concerne une batterie secondaire capable d'améliorer la qualité de soudage entre un évent de sécurité et une languette de connexion. Par exemple, l'invention concerne une batterie secondaire comprenant : un ensemble d'électrodes comprenant une première électrode, une seconde électrode et un séparateur interposé entre la première électrode et la seconde électrode; un boîtier pour recevoir l'ensemble d'électrodes; une plaque de capuchon couplée à la partie supérieure du boîtier, connectée électriquement à la première électrode, et ayant un évent de sécurité formé sur un côté de celui-ci; une première borne d'électrode formée pour passer à travers la plaque de capuchon; et une languette de connexion pour connecter électriquement la première borne d'électrode à l'évent de sécurité, une saillie de couplage étant formée au centre de l'évent de sécurité, et un trou de couplage auquel la saillie de couplage est couplée est formé dans la languette de connexion.
PCT/KR2018/001064 2017-04-25 2018-01-24 Batterie secondaire Ceased WO2018199438A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2017-0053062 2017-04-25
KR1020170053062A KR20180119375A (ko) 2017-04-25 2017-04-25 이차 전지

Publications (1)

Publication Number Publication Date
WO2018199438A1 true WO2018199438A1 (fr) 2018-11-01

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Application Number Title Priority Date Filing Date
PCT/KR2018/001064 Ceased WO2018199438A1 (fr) 2017-04-25 2018-01-24 Batterie secondaire

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KR (1) KR20180119375A (fr)
WO (1) WO2018199438A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220344755A1 (en) * 2021-04-21 2022-10-27 Prime Planet Energy & Solutions, Inc. Power storage module and method of manufacturing same

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