WO2019050180A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2019050180A1
WO2019050180A1 PCT/KR2018/009257 KR2018009257W WO2019050180A1 WO 2019050180 A1 WO2019050180 A1 WO 2019050180A1 KR 2018009257 W KR2018009257 W KR 2018009257W WO 2019050180 A1 WO2019050180 A1 WO 2019050180A1
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WO
WIPO (PCT)
Prior art keywords
plate
electrode
case
terminal
bus bar
Prior art date
Application number
PCT/KR2018/009257
Other languages
French (fr)
Korean (ko)
Inventor
장명재
변상원
Original Assignee
삼성에스디아이(주)
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Filing date
Publication date
Application filed by 삼성에스디아이(주) filed Critical 삼성에스디아이(주)
Publication of WO2019050180A1 publication Critical patent/WO2019050180A1/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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside 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
    • 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
    • H01M50/50—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
    • 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 capable of charging and discharging unlike a primary battery which can not be charged.
  • the secondary battery is used in a portable electronic device such as a mobile phone and a camcorder , And a large-capacity battery of a battery pack unit having dozens of battery packs is widely used as a power source for driving a motor such as a hybrid vehicle.
  • the secondary battery includes an electrode assembly and an electrolyte formed between a positive electrode plate and a negative electrode plate via a separator, which is an insulator, and a cap plate provided in the case.
  • a typical example of the electrode assembly is a jelly-roll type.
  • the electrode assembly of the jelly roll type uses a method in which a solid portion is protruded to the upper side of the electrode assembly and a collector is connected to the upper side.
  • the position of the electrode terminals of the general-purpose secondary battery is located on the upper surface, and the position of the electrode terminals may be located in the lateral direction or in the left-right direction depending on the space constraint or the coupling structure with the electronic device.
  • the present invention provides a secondary battery capable of reducing space in a height direction by moving a bus bar connecting portion electrically connected to an electrode terminal portion to a side surface of a case.
  • the secondary battery according to the present invention includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator formed between the first electrode plate and the second electrode plate; A case having the electrode assembly inserted therein and having a bottom surface and a side extending upward from the bottom surface; A cap plate coupled to an upper portion of the case; A first electrode terminal portion electrically connected to the first electrode plate and formed through the cap plate; And a first bus bar connection part electrically connected to the first electrode terminal part and extending from a top of the cap plate to a side of the case.
  • An insulating portion may be formed between the first bus bar connecting portion, the cap plate, and the side surface of the case.
  • the first electrode terminal portion includes a first current collector electrically connected to the first current collector plate; A first terminal coupled to the first current collector and formed through the cap plate; A terminal plate coupled to an upper portion of the first terminal; And an insulating member formed between the terminal plate and the cap plate.
  • first bus bar connection portion is electrically connected to the terminal plate and extends in the horizontal direction; And a bent portion bent from the extended portion and extending to a lower portion of the case, the bent portion being formed in parallel with the side surface of the case.
  • a second bus bar connection may be further formed between the second bus bar and the side of the case.
  • the cap plate may further include a shorting plate installed on a cap plate disposed below the terminal plate and shorting the cap plate and the terminal plate when the pressure inside the case is greater than a predetermined pressure.
  • the side surface of the case includes a pair of long side surfaces and a pair of short side surfaces connecting the pair of long side surfaces and narrower in area than the pair of long side surfaces, And may be formed parallel to the short side of the pair.
  • the thickness of the pair of short side surfaces may be greater than the thickness of the pair of long side surfaces.
  • the secondary battery according to an embodiment of the present invention is formed by extending the bus bar connecting portion, which is electrically connected to the first terminal and is connected to the bus bar, from the cap plate to the side of the case, thereby reducing the height of the secondary battery, .
  • FIG. 1 is a perspective view illustrating a secondary battery according to an embodiment of the present invention.
  • Fig. 2 is a cross-sectional view showing the line I-I in Fig. 1.
  • FIG 3 is a plan view showing a case in a secondary battery according to an embodiment of the present invention.
  • FIG. 4 is an exploded perspective view showing a coupling relation between the first electrode terminal portion and the bus bar connection portion.
  • FIG. 5 is a perspective view illustrating a secondary battery according to another embodiment of the present invention.
  • FIG. 1 is a perspective view illustrating a secondary battery according to an embodiment of the present invention.
  • Fig. 2 is a cross-sectional view showing the line I-I in Fig. 1.
  • Fig. 3 is a plan view showing a case in a secondary battery according to an embodiment of the present invention.
  • 4 is an exploded perspective view showing a coupling relation between the first electrode terminal portion and the bus bar connection portion.
  • a secondary battery 100 includes an electrode assembly 110, a case 120, a first electrode terminal 130, a second electrode terminal 140, A cap assembly 150, and a bus bar connection 160.
  • FIG. 1 a secondary battery 100 according to an embodiment of the present invention includes an electrode assembly 110, a case 120, a first electrode terminal 130, a second electrode terminal 140, A cap assembly 150, and a bus bar connection 160.
  • the electrode assembly 110 is formed by winding or stacking a stack of a first electrode plate 111, a separator 113, and a second electrode plate 112 which are formed in a thin plate or film shape.
  • the first electrode plate 111 can operate as a cathode
  • the second electrode plate 112 can operate as an anode.
  • the first electrode plate 111 and the second electrode plate 112 may be disposed at different polarities from one another according to the selection of a person skilled in the art.
  • the first electrode plate 111 is formed by applying a first electrode active material such as graphite or carbon to a first electrode current collector formed of a metal foil such as copper or nickel, Electrode uncoated portion 111a.
  • the first electrode non-holding portion 111a protrudes to one side of the electrode assembly 110.
  • the first electrode non-holding portion 111a provides a path for current flow between the first electrode plate 111 and the first electrode plate.
  • the second electrode plate 112 is formed by applying a second electrode active material such as a transition metal oxide to a second electrode current collector formed of a metal foil such as aluminum, And a non-printed portion 112a.
  • the second electrode uncoated portion 112a protrudes to the other side of the electrode assembly 110.
  • the second electrode non-holding portion 112a is a path for current flow between the second electrode plate 112 and the outside of the second electrode plate.
  • the separator 113 is positioned between the first electrode plate 111 and the second electrode plate 112 to prevent short-circuiting and enable movement of lithium ions.
  • the separator 113 may be made of polyethylene, polypropylene or a composite film of polyethylene and polypropylene.
  • the first electrode assembly 110 is housed in the case 120 together with the electrolyte solution.
  • the electrolyte may be a lithium salt such as LiPF 6 or LiBF 4 in an organic solvent such as EC, PC, DEC, EMC and DMC.
  • the electrolytic solution may be liquid, solid or gel-like.
  • the case 120 is formed of a conductive metal such as aluminum, aluminum alloy, or nickel-plated steel, and has a substantially hexahedron shape with an opening through which the electrode assembly 110 can be inserted. 2, the peripheral portion of the cap assembly 150 is substantially opened, although the opening portion is not shown because the case 120 and the cap assembly 150 are shown in a coupled state.
  • the case 120 may function as one polarity, for example, an anode.
  • the inner surface of the case 120 is insulated and insulated from the electrode assembly 110.
  • the case 120 includes a bottom surface 121 and four side surfaces 123 and 124 extending upward from the bottom surface 121.
  • the side surfaces 123 and 124 may include a pair of long side surfaces 123 and a pair of short side surfaces 124.
  • the pair of long side surfaces 123 refers to a side surface having a relatively large cross-sectional area among the four side surfaces 122.
  • the bus bar 170 may be coupled to one of the four side surfaces 123 and 124 by welding and the side surface of the portion where the bus bar 170 is coupled may be thicker than the other side surface .
  • the bus bar 170 may be coupled to the short side 124, and the thickness t1 of the pair of short side surfaces 124 may be greater than the thickness t2 of the pair of long side surfaces 123 (T1 > t2).
  • the thickness of the short side surface 124 is greater than the thickness t3 of the bottom surface 121 (t1 > t3).
  • the thickness of the short side surface 124 is greater than about 2 mm. This is to ensure safety when the bus bar 170 is directly coupled to the short side 124 of the case 120. [ That is, if the thickness of the short side 124 is less than 2 mm when the bus bar 170 is directly welded to the short side 124 of the case 120, the case 120 may be damaged during welding.
  • the first electrode terminal part 130 is formed of a conductive material such as copper or nickel, and is electrically connected to the first electrode plate 111.
  • the first electrode terminal part 130 includes a first current collector 131, a first terminal 132, a terminal plate 133, and an insulating member 134.
  • the first current collector 131 has a first connection part 131a connected to the first electrode non-conductive part 111a and a second connection part 131b bent from the end of the first connection part 131a, And a first extension portion 131b extending from the first extension portion 131b.
  • the first connection part 131a is formed on one side of the electrode assembly 110 and is formed in the form of a plate substantially in contact with the first electrode non-conductive part 111a.
  • the first electrode non-holding portion 111a may be welded to the first connecting portion 131a.
  • the first extension part 131b is bent and extended at an end of the first connection part 131a and is disposed between the upper part of the electrode assembly 110 and the lower part of the cap assembly 150 and is formed in a plate shape .
  • a first terminal hole 131c is formed on one side of the first extension part 131b. The first terminal 132 is inserted into the first terminal hole 131c.
  • the first terminal 132 is formed in a column shape and penetrates through a cap plate 151 to be described later, and protrudes and extends for a predetermined length to an upper portion of the cap plate 151.
  • a flange 132a is formed below the first terminal 132 to prevent the first terminal 132 from being detached from the cap plate 151. [ A region located below the flange 132a at the first terminal 132 is fitted in the first terminal hole 131c.
  • the terminal plate 133 is coupled to the first terminal 132 protruding upward from the cap plate 151.
  • the terminal plate 134 is welded to the first terminal 132 to fix the first terminal 122 to the cap plate 151.
  • the boundary region between the first terminal 132 and the terminal plate 133 is welded to each other.
  • a laser beam is irradiated to a boundary region between the first terminal 132 and the terminal plate 133 exposed above the cap plate 151, and the boundary regions are melted and cooled and welded to each other.
  • an insulating member 134 is formed between the terminal plate 133 and the cap plate 151 to insulate the first terminal 132 from the cap plate 151.
  • a through hole 134a is formed in the insulating member 134 at a position corresponding to the shorting plate 155 so that the shorting plate 155 can be short-circuited to the terminal plate 133.
  • the second electrode terminal part 140 is formed of a conductive material such as aluminum and is electrically connected to the second electrode plate 112.
  • the second electrode terminal part 140 includes a second current collector 141 and a second terminal 142.
  • the second current collector 141 has a second connection portion 141a connected to the second electrode non-conductive portion 112a and a second connection portion 141b bent from the end of the second connection portion 141a, And a second extension 141b extending from the second extension 141b.
  • the second connection part 141a 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 non-conductive part 112a.
  • the second electrode non-holding portion 112a may be welded to the second connecting portion 141a.
  • the second extension portion 141b is bent and extended at an end of the second connection portion 141a and is disposed between the upper portion of the electrode assembly 110 and the lower portion of the cap assembly 150 and is formed in a plate shape .
  • a second terminal hole 141c is formed on one side of the second extension 141b. And the second terminal portion 142 is inserted into the second terminal hole 141c.
  • a fuse hole 141d is formed on the other side of the second extension 141b. The fuse hole 141d is spaced apart from the second terminal hole 141c and is located at a portion adjacent to the second connection portion 141a. The fuse hole 141d functions as a fuse to cut off the flow of current by melting and cutting a region where the fuse hole 141d is formed due to heat generated when a short circuit occurs in the secondary battery and a large current flows.
  • the second terminal 142 is formed in a column shape and is electrically connected to the second current collector 141.
  • a flange 142a is formed under the second terminal 142 so that the second terminal 142 does not come off from the second extension 141b.
  • the second terminal 142 is fitted in the second terminal hole 141c.
  • the upper portion of the second terminal 142 is electrically connected to the lower surface of the cap plate 151 and does not extend upwardly through the cap plate 151.
  • the second terminal 142 may be electrically connected to the lower surface of the cap plate 151 by welding. Accordingly, the cap plate 151 has the same polarity (positive polarity) as the second terminal 142.
  • the case 120 to which the cap plate 151 is coupled also has the same polarity (anode) as the second terminal 142, the anode bus bar 172 or the second bus bar 172 You will be able to connect to anywhere.
  • the second terminal 142 does not protrude to the outside of the cap plate 151, the height of the secondary battery 100 can be reduced. 1, since the case 120 electrically connected to the second terminal 142 has a positive electrode, the second bus bar 172 is connected to the short side 124 of the case 120 The height of the secondary battery 100 can be reduced.
  • the cap assembly 150 is coupled to the upper portion of the case 120.
  • the cap assembly 150 includes a cap plate 151, a gasket 152, a cap 153, a safety vent 154, and a shorting plate 155.
  • the cap plate 151 seals the upper opening of the case 120 and may be formed of the same material as the case 120.
  • the cap plate 151 may be coupled to the case 120 by laser welding.
  • the cap plate 151 is formed with an electrolyte injection hole 151a for injecting an electrolyte solution and a short hole 151c in which a vent hole 151b and a shorting plate 155 for forming a safety vent 154 are formed.
  • the gasket 152 is formed of an insulating material between the first terminal 132 and the cap plate 151 to seal the gap between the first terminal 132 and the cap plate 151. Specifically, the gasket 152 extends downward through the cap plate 151 and is formed to cover the flange portion 132a of the first terminal 132. The gasket 152 prevents external moisture from penetrating the interior of the secondary battery 100 or prevents the electrolyte contained in the secondary battery 100 from flowing out. The gasket 152 also serves to insulate the first terminal 132 from the cap plate 151.
  • the cap 153 seals the electrolyte injection hole 151a of the cap plate 151.
  • the safety vent 154 is installed in the vent hole 151b of the cap plate 151 and is provided with a notch .
  • the shorting plate 155 is disposed in the shorting hole 151c of the cap plate 151 and is located between the insulating member 134 of the second terminal unit 130 and the cap plate 151.
  • the shorting plate 155 may include an inverting plate including a downwardly convex round portion and a rim portion fixed to the cap plate 151. Therefore, the shorting plate 155 is electrically connected to the cap plate 151.
  • the shorting plate 155 is inverted and protrudes upward to contact the terminal plate 133 to cause a short circuit.
  • the shorting plate 155 is reversed when the pressure inside the case 120 is larger than the set pressure, thereby shorting the cap plate 151 and the first terminal 132. If the short circuit is caused, a large current flows and heat is generated. At this time, the region where the fuse hole 141d is formed is melted and cut to function as a fuse, thereby improving the safety of the secondary battery 100.
  • the bus bar connecting part 160 is electrically connected to the first electrode terminal part 130 and is connected to the bus bar 170.
  • the bus bar connecting portion 160 includes a bent portion 162 bent from the extending portion 161 and the extending portion 161.
  • the bus bar connecting portion 160 may be defined as a cathode bus bar connecting portion 160 or a first bus bar connecting portion 160 since the bus bar connecting portion 160 is electrically connected to the first collector plate 111,
  • the extended portion 161 is electrically connected to the terminal plate 133 and extends horizontally from the terminal plate 133.
  • the extended portion 161 is parallel to the cap plate 151 and extends toward the outside of the cap plate 151. That is, the extension portion 161 is coupled to the outside of the terminal plate 133 and is formed in a flat plate shape so as to form the same surface as the terminal plate 133.
  • the extended portion 161 can be electrically connected to the terminal plate 133 by welding the surface on which the terminal plate 133 and the extended portion 161 contact.
  • a portion of the extension 161 may extend over the top of the insulating member 134.
  • the bent portion 162 is bent from the extended portion 161 and extends to the lower portion of the case 120.
  • the bent portion 162 is formed parallel to the short side surface 124 of the case 120.
  • a bus bar 170 may be connected to the bent portion 162.
  • the bus bar 170 connected to the bent portion 162 may be defined as a negative bus bar 171 or a first bus bar 171. Since the case 120 is electrically connected to the second electrode terminal part 140, the anode bus bar 172 or the second bus bar 172 is directly connected to the short side 124 of the case 120 Can be connected.
  • the bus bar 170 may form a single battery pack by connecting a plurality of secondary batteries to each other in series or in parallel.
  • the bus bar 170 may be welded to the bus bar connecting part 160 and the short side 124 of the case 120, respectively. Therefore, the bus bar 170 is formed parallel to the short side surface 124 of the case 120.
  • An insulating portion 165 is formed between the first bus bar connecting portion 160 and the end surface 124 of the cap plate 151 and the case 120 so that the first bus bar connecting portion 160, The cap plate 151 and the case 120 are insulated.
  • the insulating portion 165 is located between the extension portion 161 and the cap plate 151 and between the bent portion 162 and the short side surface 124 of the case 120.
  • the insulating portion 165 is made of an insulating material.
  • the secondary battery 100 includes the bus bar connecting portion 160 electrically connected to the first terminal 132 from the cap plate 151 to the side surface 124 of the case 120
  • the height of the secondary battery 100 can be reduced and the space in the height direction can be reduced.
  • the electrode terminal is to be formed on the side of the case (i.e., the structure in which the cap plate is moved to the side of the case), it is difficult to form a structure such as a safety vent and a short- There was a case.
  • the safety vent 154 and the shorting plate 155 may be connected to the cap plate (not shown) by extending the bus bar connecting portion 160 electrically connected to the first terminal 132 to the side surface 124 of the case 120.
  • 151 and the first terminal 132 is located on the side surface 124 of the case 120. In this case,
  • FIG. 5 is a perspective view illustrating a secondary battery according to another embodiment of the present invention.
  • the secondary battery 200 shown in FIG. 5 is the same as the secondary battery 100 shown in FIG. 1 except that the second bus bar connecting portion 260 is further formed.
  • the second bus bar 172 of the rechargeable battery 200 is not directly connected to the case 120 but includes a separate second bus bar connection part 260, Lt; / RTI >
  • the second bus bar connection part 260 is formed in a substantially rectangular plate shape and is electrically connected to the short side surface 124 of the case 120. Since the second electrode terminal portion 140 is electrically connected to the cap plate 151 and the case 120, the second bus bar connecting portion 260 connected to the short side surface 124 of the case 120 And has the same polarity as the second electrode terminal portion 140, that is, an anode. Accordingly, the second bus bar connecting part 260 may be referred to as a positive bus bar connecting part.
  • a second bus bar 172 is connected to the second bus bar connection part 260.
  • the second bus bar connecting portion 260 is formed on the short side 124 of the case 120 as described above, the short side surface 124 of the case 120 is divided into the long side surface 123 and the bottom surface 121, It is not necessary to form it thick.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

The present invention relates to a secondary battery which has reduced space in the height direction by means of moving a bus bar connection portion, which is electrically connected to an electrode terminal portion, to the lateral side of a case. For example, disclosed is a secondary battery comprising: an electrode assembly which comprises a first electrode plate, a second electrode plate and a separator formed between the first electrode plate and the second electrode plate; a case in which the electrode assembly is inserted and which has a floor surface and a lateral surface extending upward from the floor surface; a cap plate which is coupled to the top part of the case; a first electrode terminal portion which is electrically connected to the first electrode plate and is formed through the cap plate; and a first bus bar connection portion which is electrically connected to the first electrode terminal portion and extends from the top part of the cap plate to the lateral surface of the case.

Description

이차 전지Secondary battery
본 발명은 이차 전지에 관한 것이다.The present invention relates to a secondary battery.
이차 전지(Secondary battery)는 충전이 불가능한 일차 전지와는 달리 충전 및 방전이 가능한 전지로서, 하나의 전지 셀이 팩 형태로 포장된 저용량 전지의 경우 휴대폰 및 캠코더와 같은 휴대가 가능한 소형 전자기기에 사용되고, 전지 팩이 수십 개 연결된 전지 팩 단위의 대용량 전지의 경우 하이브리드 자동차 등의 모터 구동용 전원으로 널리 사용되고 있다. A secondary battery is a battery capable of charging and discharging unlike a primary battery which can not be charged. In the case of a low-capacity battery in which one battery cell is packed, the secondary battery is used in a portable electronic device such as a mobile phone and a camcorder , And a large-capacity battery of a battery pack unit having dozens of battery packs is widely used as a power source for driving a motor such as a hybrid vehicle.
상기 이차 전지는, 양, 음극판 사이에 절연체인 세퍼레이터(separator)를 개재하여 형성된 전극 조립체와 전해액을 케이스에 내장 설치하고, 케이스에 캡 플레이트를 설치하여 구성된다. 여기서, 상기 전극 조립체의 대표적인 예로는 젤리-롤 형태를 들 수 있다. 이러한 젤리 롤 형태의 전극 조립체는 전극 조립체 상부 측면으로 무지부가 돌출되고 상기 상부 측면으로 집전체가 연결되는 방식을 이용한다. The secondary battery includes an electrode assembly and an electrolyte formed between a positive electrode plate and a negative electrode plate via a separator, which is an insulator, and a cap plate provided in the case. A typical example of the electrode assembly is a jelly-roll type. The electrode assembly of the jelly roll type uses a method in which a solid portion is protruded to the upper side of the electrode assembly and a collector is connected to the upper side.
일반적인 구조의 이차전지는 전극 단자들의 위치가 상부면에 위치하는데, 공간 제약이나 전자기기와의 결합 구조에 따라 전극 단자들의 위치를 측면 또는 좌우 방향에 위치해야 하는 경우가 발생한다.The position of the electrode terminals of the general-purpose secondary battery is located on the upper surface, and the position of the electrode terminals may be located in the lateral direction or in the left-right direction depending on the space constraint or the coupling structure with the electronic device.
본 발명은 전극 단자부와 전기적으로 연결된 버스바 연결부를 케이스 측면으로 이동시켜 높이 방향의 공간을 감소시킬 수 있는 이차 전지를 제공한다.The present invention provides a secondary battery capable of reducing space in a height direction by moving a bus bar connecting portion electrically connected to an electrode terminal portion to a side surface of a case.
본 발명에 의한 이차 전지는 제 1 전극판, 제 2 전극판 및 상기 제 1 전극판과 제 2 전극판 사이에 형성된 세퍼레이터로 이루어진 전극 조립체; 상기 전극 조립체가 삽입되며, 바닥면과 상기 바닥면으로부터 상부로 연장된 측면을 갖는 케이스; 상기 케이스의 상부에 결합된 캡 플레이트; 상기 제 1 전극판과 전기적으로 연결되며, 상기 캡 플레이트를 관통하여 형성된 제 1 전극 단자부; 및 상기 제 1 전극 단자부와 전기적으로 연결되며, 상기 캡 플레이트의 상부에서 상기 케이스의 측면으로 연장되어 형성된 제 1 버스바 연결부를 포함하는 것을 특징으로 한다.The secondary battery according to the present invention includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator formed between the first electrode plate and the second electrode plate; A case having the electrode assembly inserted therein and having a bottom surface and a side extending upward from the bottom surface; A cap plate coupled to an upper portion of the case; A first electrode terminal portion electrically connected to the first electrode plate and formed through the cap plate; And a first bus bar connection part electrically connected to the first electrode terminal part and extending from a top of the cap plate to a side of the case.
상기 제 1 버스바 연결부와 상기 캡 플레이트 및 상기 케이스의 측면 사이에는 절연부가 형성될 수 있다.An insulating portion may be formed between the first bus bar connecting portion, the cap plate, and the side surface of the case.
상기 제 1 전극 단자부는 상기 제 1 집전판과 전기적으로 접속된 제 1 집전부; 상기 제 1 집전부와 결합되며, 상기 캡 플레이트를 관통하여 형성된 제 1 단자; 상기 제 1 단자의 상부에 결합된 단자 플레이트; 및 상기 단자 플레이트와 상기 캡 플레이트 사이에 형성된 절연 부재를 포함할 수 있다.The first electrode terminal portion includes a first current collector electrically connected to the first current collector plate; A first terminal coupled to the first current collector and formed through the cap plate; A terminal plate coupled to an upper portion of the first terminal; And an insulating member formed between the terminal plate and the cap plate.
상기 제 1 버스바 연결부는 상기 단자 플레이트에 전기적으로 접속되며 수평 방향으로 연장된 연장부; 및 상기 연장부로부터 절곡되고 상기 케이스의 하부로 연장되어, 상기 케이스의 측면과 평행하게 형성된 절곡부를 포함할 수 있다.Wherein the first bus bar connection portion is electrically connected to the terminal plate and extends in the horizontal direction; And a bent portion bent from the extended portion and extending to a lower portion of the case, the bent portion being formed in parallel with the side surface of the case.
상기 절곡부에 전기적으로 접속된 제 1 버스바를 더 포함할 수 있다.And a first bus bar electrically connected to the bent portion.
상기 제 2 전극판과 전기적으로 연결되며, 상기 캡 플레이트의 하면에 전기적으로 접속된 제 2 전극 단자부와, 상기 케이스의 측면에 전기적으로 접속되고, 상기 제 1 버스바와 이격되어 평행하게 배열된 제 2 버스바를 더 포함할 수 있다.A second electrode terminal portion electrically connected to the second electrode plate and electrically connected to a lower surface of the cap plate; and a second electrode terminal portion electrically connected to a side surface of the case, And may further include a bus bar.
상기 제 2 버스바와 상기 케이스의 측면 사이에는 제 2 버스바 연결부가 더 형성될 수 있다.A second bus bar connection may be further formed between the second bus bar and the side of the case.
상기 단자 플레이트의 하부에 위치한 캡 플레이트에 설치되며, 상기 케이스 내부의 압력이 설정 압력보다 커지면 반전되어 상기 캡 플레이트와 상기 단자 플레이트 사이를 단락시키는 단락 플레이트를 더 포함할 수 있다.The cap plate may further include a shorting plate installed on a cap plate disposed below the terminal plate and shorting the cap plate and the terminal plate when the pressure inside the case is greater than a predetermined pressure.
상기 케이스의 측면은 한 쌍의 장측면과, 상기 한 쌍의 장측면을 연결하며 상기 한 쌍의 장측면에 비해 면적이 좁은 한 쌍의 단측면을 포함하고, 상기 제 1 버스바 연결부는 상기 한 쌍의 단측면과 평행하게 형성될 수 있다.Wherein the side surface of the case includes a pair of long side surfaces and a pair of short side surfaces connecting the pair of long side surfaces and narrower in area than the pair of long side surfaces, And may be formed parallel to the short side of the pair.
상기 한 쌍의 단측면의 두께는 상기 한 쌍의 장측면의 두께보다 두껍게 형성될 수 있다.The thickness of the pair of short side surfaces may be greater than the thickness of the pair of long side surfaces.
본 발명의 일 실시예에 따른 이차 전지는 제 1 단자와 전기적으로 연결되며 버스바가 결합되는 버스바 연결부를 캡 플레이트로부터 케이스의 측면으로 연장시켜 형성함으로써, 이차 전지의 높이를 줄여 높이 방향의 공간을 감소시킬 수 있다.The secondary battery according to an embodiment of the present invention is formed by extending the bus bar connecting portion, which is electrically connected to the first terminal and is connected to the bus bar, from the cap plate to the side of the case, thereby reducing the height of the secondary battery, .
도 1은 본 발명의 일 실시예에 따른 이차 전지를 도시한 사시도이다. 1 is a perspective view illustrating a secondary battery according to an embodiment of the present invention.
도 2는 도 1에서 Ⅰ-Ⅰ선을 도시한 단면도이다. Fig. 2 is a cross-sectional view showing the line I-I in Fig. 1. Fig.
도 3은 본 발명의 일 실시예에 따른 이차 전지에서 케이스를 도시한 평면도이다. 3 is a plan view showing a case in a secondary battery according to an embodiment of the present invention.
도 4는 제 1 전극 단자부와 버스바 연결부의 결합 관계를 도시한 분해 사시도이다.4 is an exploded perspective view showing a coupling relation between the first electrode terminal portion and the bus bar connection portion.
도 5는 본 발명의 다른 실시예에 따른 이차 전지를 도시한 사시도이다.5 is a perspective view illustrating a secondary battery according to another embodiment of the present invention.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 상세히 설명하기로 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명의 실시예들은 당해 기술 분야에서 통상의 지식을 가진 자에게 본 발명을 더욱 완전하게 설명하기 위하여 제공되는 것이며, 하기 실시예는 여러 가지 다른 형태로 변형될 수 있으며, 본 발명의 범위가 하기 실시예에 한정되는 것은 아니다. 오히려, 이들 실시예는 본 개시를 더욱 충실하고 완전하게 하고, 당업자에게 본 발명의 사상을 완전하게 전달하기 위하여 제공되는 것이다.The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, It is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more faithful and complete, and will fully convey the scope of the invention to those skilled in the art.
또한, 이하의 도면에서 각 층의 두께나 크기는 설명의 편의 및 명확성을 위하여 과장 또는 축소된 것이며, 도면상에서 동일 부호는 동일한 요소를 지칭한다. 본 명세서에서 사용된 바와 같이, 용어 "및/또는" 는 해당 열거된 항목 중 어느 하나 및 하나 이상의 모든 조합을 포함한다. In the following drawings, the thickness and the size of each layer are exaggerated or reduced for convenience and clarity of description, and the same reference numerals denote the same elements in the drawings. As used herein, the term " and / or " includes any and all combinations of any of the listed items.
또한, "하부(beneath)", "아래(below)", "낮은(lower)", "상부(above)", "위(upper)"와 같은 공간에 관련된 용어가 도면에 도시된 한 요소 또는 특징과 다른 요소 또는 특징의 용이한 이해를 위해 이용된다. 이러한 공간에 관련된 용어는 이차 전지의 다양한 제조 공정 또는 사용 상태에 따라 본 발명의 용이한 이해를 위한 것이며, 본 발명을 한정하기 위한 것은 아니다. 예를 들어, 도면의 이차 전지가 뒤집어지면, "하부" 또는 "아래"로 설명된 요소는 "상부" 또는 "위에"로 된다. 따라서, "아래"는 "상부" 또는 "아래"를 포괄한다.It is also to be understood that terms related to space such as "beneath", "below", "lower", "above", "upper" And is used for an easy understanding of features and other elements or features. The term related to such a space is for easy understanding of the present invention depending on various manufacturing processes or use states of the secondary battery, and is not intended to limit the present invention. For example, if the secondary cell of the drawing is inverted, the elements described as "lower" or "lower" will be "upper" or "above." Accordingly, " below " includes " upper " or " lower ".
도 1은 본 발명의 일 실시예에 따른 이차 전지를 도시한 사시도이다. 도 2는 도 1에서 Ⅰ-Ⅰ선을 도시한 단면도이다. 도 3은 본 발명의 일 실시예에 따른 이차 전지에서 케이스를 도시한 평면도이다. 도 4는 제 1 전극 단자부와 버스바 연결부의 결합 관계를 도시한 분해 사시도이다. 1 is a perspective view illustrating a secondary battery according to an embodiment of the present invention. Fig. 2 is a cross-sectional view showing the line I-I in Fig. 1. Fig. 3 is a plan view showing a case in a secondary battery according to an embodiment of the present invention. 4 is an exploded perspective view showing a coupling relation between the first electrode terminal portion and the bus bar connection portion.
도 1 내지 도 4를 참조하면, 본 발명의 일 실시예에 따른 이차 전지(100)는 전극 조립체(110), 케이스(120), 제 1 전극 단자부(130), 제 2 전극 단자부(140), 캡 조립체(150) 및 버스바 연결부(160)를 포함한다.1 to 4, a secondary battery 100 according to an embodiment of the present invention includes an electrode assembly 110, a case 120, a first electrode terminal 130, a second electrode terminal 140, A cap assembly 150, and a bus bar connection 160. FIG.
상기 전극 조립체(110)는 얇은 판형 혹은 막형으로 형성된 제 1 전극판(111), 세퍼레이터(113) 및 제 2 전극판(112)의 적층체를 적층체를 권취하거나 겹쳐서 형성한다. 여기서, 제 1 전극판(111)은 음극으로서 동작할 수 있으며, 제 2 전극판(112)은 양극으로서 동작할 수 있다. 물론, 당업자의 선택에 따라 상기 제 1 전극판(111) 및 제 2 전극판(112)은 서로 극성을 달리하여 배치될 수도 있다.The electrode assembly 110 is formed by winding or stacking a stack of a first electrode plate 111, a separator 113, and a second electrode plate 112 which are formed in a thin plate or film shape. Here, the first electrode plate 111 can operate as a cathode, and the second electrode plate 112 can operate as an anode. Of course, the first electrode plate 111 and the second electrode plate 112 may be disposed at different polarities from one another according to the selection of a person skilled in the art.
상기 제 1 전극판(111)은 구리 또는 니켈과 같은 금속 포일로 형성된 제 1 전극 집전체에 흑연 또는 탄소 등의 제 1 전극 활물질을 도포함으로써 형성되며, 제 1 활물질이 도포되지 않는 영역인 제 1 전극 무지부(111a)를 포함한다. 상기 제 1 전극 무지부(111a)는 상기 전극 조립체(110)의 일측으로 돌출된다. 또한, 상기 제 1 전극 무지부(111a)는 제 1 전극판(111)과, 제 1 전극판 외부 간의 전류 흐름의 통로를 제공한다.The first electrode plate 111 is formed by applying a first electrode active material such as graphite or carbon to a first electrode current collector formed of a metal foil such as copper or nickel, Electrode uncoated portion 111a. The first electrode non-holding portion 111a protrudes to one side of the electrode assembly 110. [ In addition, the first electrode non-holding portion 111a provides a path for current flow between the first electrode plate 111 and the first electrode plate.
상기 제 2 전극판(112)은 알루미늄과 같은 금속 포일로 형성된 제 2 전극 집전체에 전이금속산화물 등의 제 2 전극 활물질을 도포함으로써 형성되며, 제 2 전극 활물질이 도포되지 않은 영역인 제 2 전극 무지부(112a)를 포함한다. 상기 제 2 전극 무지부(112a)는 상기 전극 조립체(110)의 타측으로 돌출된다. 또한, 상기 제 2 전극 무지부(112a)는 제 2 전극판(112)과, 제 2 전극판 외부 간의 전류 흐름의 통로가 된다.The second electrode plate 112 is formed by applying a second electrode active material such as a transition metal oxide to a second electrode current collector formed of a metal foil such as aluminum, And a non-printed portion 112a. The second electrode uncoated portion 112a protrudes to the other side of the electrode assembly 110. [ The second electrode non-holding portion 112a is a path for current flow between the second electrode plate 112 and the outside of the second electrode plate.
상기 세퍼레이터(113)는 제 1 전극판(111)과 제 2 전극판(112) 사이에 위치되어 쇼트를 방지하고 리튬 이온의 이동을 가능하게 하는 역할을 한다. 상기 세퍼레이터(113)는 폴리에틸렌이나, 폴리 프로필렌이나, 폴리 에틸렌과 폴리 프로필렌의 복합 필름으로 이루어질 수 있다.The separator 113 is positioned between the first electrode plate 111 and the second electrode plate 112 to prevent short-circuiting and enable movement of lithium ions. The separator 113 may be made of polyethylene, polypropylene or a composite film of polyethylene and polypropylene.
또한, 상기 제 1 전극 조립체(110)는 실질적으로 전해액과 함께 상기 케이스(120)에 수납된다. 상기 전해액은 EC, PC, DEC, EMC, DMC와 같은 유기 용매에 LiPF6, LiBF4와 같은 리튬염으로 이루어질 수 있다. 또한, 상기 전해액은 액체, 고체 또는 겔상일 수 있다. Also, the first electrode assembly 110 is housed in the case 120 together with the electrolyte solution. The electrolyte may be a lithium salt such as LiPF 6 or LiBF 4 in an organic solvent such as EC, PC, DEC, EMC and DMC. In addition, the electrolytic solution may be liquid, solid or gel-like.
상기 케이스(120)는 알루미늄, 알루미늄 합금 또는 니켈이 도금된 스틸과 같은 도전성 금속으로 형성되며, 전극 조립체(110)가 삽입 안착될 수 있는 개구부가 형성된 대략 육면체 형상으로 이루어진다. 도 2에서는, 케이스(120)와 캡 조립체(150)가 결합된 상태로 도시되고 있으므로 개구부가 도시되지 않았지만, 캡 조립체(150)의 둘레 부분이 실질적으로 개방된 부분이다. 여기서, 상기 케이스(120)는 하나의 극성, 예를 들어 양극으로서 작용할 수 있다. 한편, 케이스(120)의 내면은 절연처리되어, 전극 조립체(110)와 절연된다.The case 120 is formed of a conductive metal such as aluminum, aluminum alloy, or nickel-plated steel, and has a substantially hexahedron shape with an opening through which the electrode assembly 110 can be inserted. 2, the peripheral portion of the cap assembly 150 is substantially opened, although the opening portion is not shown because the case 120 and the cap assembly 150 are shown in a coupled state. Here, the case 120 may function as one polarity, for example, an anode. On the other hand, the inner surface of the case 120 is insulated and insulated from the electrode assembly 110.
상기 케이스(120)는 바닥면(121)과, 상기 바닥면(121)으로부터 상부로 연장된 4개의 측면(123,124)을 포함한다. 구체적으로 상기 측면(123,124)은 한 쌍의 장측면(123)과 한 쌍의 단측면(124)을 포함할 수 있다. 여기서, 한 쌍의 장측면(123)은 상기 4개의 측면(122) 중에서 상대적으로 단면적이 넓은 측면을 말한다. 또한, 상기 4개의 측면(123,124) 중 어느 하나에는 용접을 통해 버스바(170)가 결합될 수 있으며, 버스바(170)가 결합되는 부분의 측면은 다른 측면에 비해서 두께를 두껍게 형성할 수 있다. 예를 들어, 상기 버스바(170)는 단측면(124)에 결합될 수 있으며, 상기 한 쌍의 단측면(124)의 두께(t1)는 상기 한 쌍의 장측면(123)의 두께(t2)보다 두껍게 형성된다(t1>t2). 더불어, 상기 단측면(124)의 두께는 상기 바닥면(121)의 두께(t3)보다 두껍게 형성된다(t1>t3). 상기 단측면(124)의 두께는 약 2mm 보다 크게 형성된다. 이는 버스바(170)가 케이스(120)의 단측면(124)에 직접적으로 결합될 때, 안전성을 확보하기 위해서이다. 즉, 버스바(170)가 케이스(120)의 단측면(124)에 직접적으로 용접될 때 단측면(124)의 두께가 2mm보다 작으면 용접 시 케이스(120)가 손상될 수 있기 때문이다. The case 120 includes a bottom surface 121 and four side surfaces 123 and 124 extending upward from the bottom surface 121. Specifically, the side surfaces 123 and 124 may include a pair of long side surfaces 123 and a pair of short side surfaces 124. Here, the pair of long side surfaces 123 refers to a side surface having a relatively large cross-sectional area among the four side surfaces 122. The bus bar 170 may be coupled to one of the four side surfaces 123 and 124 by welding and the side surface of the portion where the bus bar 170 is coupled may be thicker than the other side surface . For example, the bus bar 170 may be coupled to the short side 124, and the thickness t1 of the pair of short side surfaces 124 may be greater than the thickness t2 of the pair of long side surfaces 123 (T1 > t2). In addition, the thickness of the short side surface 124 is greater than the thickness t3 of the bottom surface 121 (t1 > t3). The thickness of the short side surface 124 is greater than about 2 mm. This is to ensure safety when the bus bar 170 is directly coupled to the short side 124 of the case 120. [ That is, if the thickness of the short side 124 is less than 2 mm when the bus bar 170 is directly welded to the short side 124 of the case 120, the case 120 may be damaged during welding.
상기 제 1 전극 단자부(130)는 구리 또는 니켈 등의 도전성 재질로 형성되며, 제 1 전극판(111)과 전기적으로 연결된다. 상기 제 1 전극 단자부(130)는 제 1 집전부(131), 제 1 단자(132), 단자 플레이트(133) 및 절연 부재(134)를 포함한다. The first electrode terminal part 130 is formed of a conductive material such as copper or nickel, and is electrically connected to the first electrode plate 111. The first electrode terminal part 130 includes a first current collector 131, a first terminal 132, a terminal plate 133, and an insulating member 134.
상기 제 1 집전부(131)는 상기 제 1 전극 무지부(111a)와 접속된 제 1 접속부(131a)와, 상기 제 1 접속부(131a)의 단부로부터 절곡되며 상기 상기 전극 조립체(110)의 상부로 연장된 제 1 연장부(131b)를 포함한다. 상기 제 1 접속부(131a)는 상기 전극 조립체(110)의 일측에 형성되며, 제 1 전극 무지부(111a)와 실질적으로 접촉하는 플레이트 형태로 형성된다. 여기서, 상기 제 1 전극 무지부(111a)는 제 1 접속부(131a)에 용접될 수 있다. 상기 제 1 연장부(131b)는 상기 제 1 접속부(131a)의 단부에서 절곡되고 연장되며, 상기 전극 조립체(110)의 상부와 캡 조립체(150)의 하부 사이에 설치되고, 플레이트 형태로 형성된다. 또한, 상기 제 1 연장부(131b)의 일측에는 제 1 단자홀(131c)이 형성된다. 상기 제 1 단자홀(131c)에는 상기 제 1 단자(132)가 끼워져 결합된다. The first current collector 131 has a first connection part 131a connected to the first electrode non-conductive part 111a and a second connection part 131b bent from the end of the first connection part 131a, And a first extension portion 131b extending from the first extension portion 131b. The first connection part 131a is formed on one side of the electrode assembly 110 and is formed in the form of a plate substantially in contact with the first electrode non-conductive part 111a. Here, the first electrode non-holding portion 111a may be welded to the first connecting portion 131a. The first extension part 131b is bent and extended at an end of the first connection part 131a and is disposed between the upper part of the electrode assembly 110 and the lower part of the cap assembly 150 and is formed in a plate shape . A first terminal hole 131c is formed on one side of the first extension part 131b. The first terminal 132 is inserted into the first terminal hole 131c.
상기 제 1 단자(132)는 기둥형으로 형성되며 후술되는 캡 플레이트(151)를 관통하며, 캡 플레이트(151)의 상부로 일정 길이 돌출 및 연장된다. 또한, 상기 제 1 단자(132)의 하부에는 제 1 단자(132)가 캡 플레이트(151)로부터 빠지지 않도록 플랜지(132a)가 형성된다. 상기 제 1 단자(132)에서 플랜지(132a)의 하부에 위치하는 영역은 제 1 단자홀(131c)에 끼워진다.The first terminal 132 is formed in a column shape and penetrates through a cap plate 151 to be described later, and protrudes and extends for a predetermined length to an upper portion of the cap plate 151. A flange 132a is formed below the first terminal 132 to prevent the first terminal 132 from being detached from the cap plate 151. [ A region located below the flange 132a at the first terminal 132 is fitted in the first terminal hole 131c.
상기 단자 플레이트(133)는 캡 플레이트(151)의 상부로 돌출된 제 1 단자(132)에 결합된다. 또한, 상기 단자 플레이트(134)는 제 1 단자(132)에 상호간 용접되어, 제 1 단자(122)를 캡 플레이트(151)에 고정시킨다. 여기서, 제 1 단자(132)와 단자 플레이트(133)의 경계 영역이 상호간 용접된다. 예를 들면, 레이저 빔이 캡 플레이트(151)의 상부로 노출된 제 1 단자(132)와 단자 플레이트(133)의 경계 영역에 조사되어, 상기 경계 영역이 상호간 용융 및 냉각되어 용접된다. 더불어, 상기 단자 플레이트(133)와 상기 캡 플레이트(151) 사이에는 절연 부재(134)가 형성되어, 상기 제 1 단자(132)와 캡 플레이트(151)를 서로 절연시킨다. 또한, 상기 절연 부재(134)에는 후술되는 단락 플레이트(155)와 대응되는 위치에 관통홀(134a)이 형성되어, 단락 플레이트(155)가 단자 플레이트(133)에 단락될 수 있도록 한다. The terminal plate 133 is coupled to the first terminal 132 protruding upward from the cap plate 151. The terminal plate 134 is welded to the first terminal 132 to fix the first terminal 122 to the cap plate 151. Here, the boundary region between the first terminal 132 and the terminal plate 133 is welded to each other. For example, a laser beam is irradiated to a boundary region between the first terminal 132 and the terminal plate 133 exposed above the cap plate 151, and the boundary regions are melted and cooled and welded to each other. In addition, an insulating member 134 is formed between the terminal plate 133 and the cap plate 151 to insulate the first terminal 132 from the cap plate 151. A through hole 134a is formed in the insulating member 134 at a position corresponding to the shorting plate 155 so that the shorting plate 155 can be short-circuited to the terminal plate 133. [
상기 제 2 전극 단자부(140)는 알루미늄 등의 도전성 재질로 형성되며, 제 2 전극판(112)과 전기적으로 연결된다. 상기 제 2 전극 단자부(140)는 제 2 집전부(141) 및 제 2 단자(142)를 포함한다. The second electrode terminal part 140 is formed of a conductive material such as aluminum and is electrically connected to the second electrode plate 112. The second electrode terminal part 140 includes a second current collector 141 and a second terminal 142.
상기 제 2 집전부(141)는 상기 제 2 전극 무지부(112a)와 접속된 제 2 접속부(141a)와, 상기 제 2 접속부(141a)의 단부로부터 절곡되며 상기 상기 전극 조립체(110)의 상부로 연장된 제 2 연장부(141b)를 포함한다. 상기 제 2 접속부(141a)는 상기 전극 조립체(110)의 타측에 형성되며, 제 2 전극 무지부(112a)와 실질적으로 접촉하는 플레이트 형태로 형성된다. 여기서, 상기 제 2 전극 무지부(112a)는 제 2 접속부(141a)에 용접될 수 있다. 상기 제 2 연장부(141b)는 상기 제 2 접속부(141a)의 단부에서 절곡되고 연장되며, 상기 전극 조립체(110)의 상부와 캡 조립체(150)의 하부 사이에 설치되고, 플레이트 형태로 형성된다. 또한, 상기 제 2 연장부(141b)의 일측에는 제 2 단자홀(141c)이 형성된다. 상기 제 2 단자홀(141c)에는 상기 제 2 단자부(142)가 끼워져 결합된다. 또한, 상기 제 2 연장부(141b)의 타측에는 퓨즈홀(141d)이 형성된다. 상기 퓨즈홀(141d)은 상기 제 2 단자홀(141c)과 이격되어 형성되며, 상기 제 2 접속부(141a)와 인접한 부분에 위치한다. 상기 퓨즈홀(141d)은 이차 전지에 단락이 발생하여 큰 전류가 흐를 때 발생한 열에 의해 상기 퓨즈홀(141d)이 형성된 영역이 용융, 절단되어 전류의 흐름을 차단하는 퓨즈 기능을 한다. The second current collector 141 has a second connection portion 141a connected to the second electrode non-conductive portion 112a and a second connection portion 141b bent from the end of the second connection portion 141a, And a second extension 141b extending from the second extension 141b. The second connection part 141a 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 non-conductive part 112a. Here, the second electrode non-holding portion 112a may be welded to the second connecting portion 141a. The second extension portion 141b is bent and extended at an end of the second connection portion 141a and is disposed between the upper portion of the electrode assembly 110 and the lower portion of the cap assembly 150 and is formed in a plate shape . A second terminal hole 141c is formed on one side of the second extension 141b. And the second terminal portion 142 is inserted into the second terminal hole 141c. A fuse hole 141d is formed on the other side of the second extension 141b. The fuse hole 141d is spaced apart from the second terminal hole 141c and is located at a portion adjacent to the second connection portion 141a. The fuse hole 141d functions as a fuse to cut off the flow of current by melting and cutting a region where the fuse hole 141d is formed due to heat generated when a short circuit occurs in the secondary battery and a large current flows.
상기 제 2 단자(142)는 기둥형으로 형성되며 상기 제 2 집전부(141)와 전기적으로 연결된다. 또한, 상기 제 2 단자(142)의 하부에는 플랜지(142a)가 형성되어 상기 제 2 단자(142)가 제 2 연장부(141b)로부터 빠지지 않게 한다. 상기 제 2 단자(142)는 제 2 단자홀(141c)에 끼워진다. 또한, 상기 제 2 단자(142)의 상부는 캡 플레이트(151)의 하면에 전기적으로 접속되며, 캡 플레이트(151)를 관통하여 상부로 연장되지 않는다. 예를 들어, 상기 제 2 단자(142)는 상기 캡 플레이트(151)의 하면에 용접에 의해 전기적으로 접속될 수 있다. 이에 따라, 상기 캡 플레이트(151)는 제 2 단자(142)와 동일한 극성(양극)을 갖게 된다. 더불어, 상기 캡 플레이트(151)가 결합되는 케이스(120)도 제 2 단자(142)와 동일한 극성(양극)을 갖게 되므로, 양극 버스바(172) 또는 제 2 버스바(172)를 케이스의 어느 곳에나 접속할 수 있게 된다. 또한, 제 2 단자(142)가 캡 플레이트(151)의 외부로 돌출되지 않으므로, 이차 전지(100)의 높이를 줄일 수 있는 효과가 있다. 구체적으로, 도 1에 도시된 바와 같이, 제 2 단자(142)와 전기적으로 연결된 케이스(120)가 양극을 띠고 있으므로, 제 2 버스바(172)를 케이스(120)의 단측면(124)에 접속하여 이차 전지(100)의 높이를 줄일 수 있게 된다.The second terminal 142 is formed in a column shape and is electrically connected to the second current collector 141. A flange 142a is formed under the second terminal 142 so that the second terminal 142 does not come off from the second extension 141b. The second terminal 142 is fitted in the second terminal hole 141c. The upper portion of the second terminal 142 is electrically connected to the lower surface of the cap plate 151 and does not extend upwardly through the cap plate 151. For example, the second terminal 142 may be electrically connected to the lower surface of the cap plate 151 by welding. Accordingly, the cap plate 151 has the same polarity (positive polarity) as the second terminal 142. In addition, since the case 120 to which the cap plate 151 is coupled also has the same polarity (anode) as the second terminal 142, the anode bus bar 172 or the second bus bar 172 You will be able to connect to anywhere. In addition, since the second terminal 142 does not protrude to the outside of the cap plate 151, the height of the secondary battery 100 can be reduced. 1, since the case 120 electrically connected to the second terminal 142 has a positive electrode, the second bus bar 172 is connected to the short side 124 of the case 120 The height of the secondary battery 100 can be reduced.
상기 캡 조립체(150)는 상기 케이스(120)의 상부에 결합된다. 상기 캡 조립체(150)는 구체적으로, 캡 플레이트(151), 가스켓(152), 마개(153), 안전 벤트(154) 및 단락 플레이트(155)를 포함한다. The cap assembly 150 is coupled to the upper portion of the case 120. Specifically, the cap assembly 150 includes a cap plate 151, a gasket 152, a cap 153, a safety vent 154, and a shorting plate 155.
상기 캡 플레이트(151)는 케이스(120)의 상단 개구부를 밀봉하며, 케이스(120)와 동일한 재질로 형성될 수 있다. 예를 들면, 상기 캡 플레이트(151)는 레이저 용접 방식으로 상기 케이스(120)에 결합될 수 있다. 상기 캡 플레이트(151)에는 전해액을 주입하는 전해액 주입구(151a)와, 안전 벤트(154)가 형성되는 벤트홀(151b) 및 단락 플레이트(155)가 형성되는 단락홀(151c)이 형성된다. The cap plate 151 seals the upper opening of the case 120 and may be formed of the same material as the case 120. For example, the cap plate 151 may be coupled to the case 120 by laser welding. The cap plate 151 is formed with an electrolyte injection hole 151a for injecting an electrolyte solution and a short hole 151c in which a vent hole 151b and a shorting plate 155 for forming a safety vent 154 are formed.
상기 가스켓(152)은 절연성 재질로 상기 제 1 단자(132)와 캡 플레이트(151) 사이에 형성되어, 제 1 단자(132)와 캡 플레이트(151) 사이를 밀봉시킨다. 구체적으로, 상기 가스켓(152)은 상기 캡 플레이트(151)를 관통하여 하부로 연장되며, 상기 제 1 단자(132)의 플랜지부(132a)를 커버하도록 형성된다. 이러한 가스켓(152)은 외부의 수분이 이차 전지(100)의 내부에 침투하지 못하도록 하거나, 이차 전지(100)의 내부에 수용된 전해액이 외부로 유출되지 못하도록 한다. 또한, 상기 가스켓(152)은 상기 제 1 단자(132)와 캡 플레이트(151) 사이를 절연시키는 역할도 한다.The gasket 152 is formed of an insulating material between the first terminal 132 and the cap plate 151 to seal the gap between the first terminal 132 and the cap plate 151. Specifically, the gasket 152 extends downward through the cap plate 151 and is formed to cover the flange portion 132a of the first terminal 132. The gasket 152 prevents external moisture from penetrating the interior of the secondary battery 100 or prevents the electrolyte contained in the secondary battery 100 from flowing out. The gasket 152 also serves to insulate the first terminal 132 from the cap plate 151.
상기 마개(153)는 캡 플레이트(151)의 전해액 주입구(151a)를 밀봉하며, 안전 벤트(154)는 캡 플레이트(151)의 벤트홀(151b)에 설치되며 설정된 압력에서 개방될 수 있도록 형성된 노치를 포함한다.The cap 153 seals the electrolyte injection hole 151a of the cap plate 151. The safety vent 154 is installed in the vent hole 151b of the cap plate 151 and is provided with a notch .
상기 단락 플레이트(155)는 캡 플레이트(151)의 단락홀(151c)에 설치되며, 제 2 단자부(130)의 절연 부재(134)와 캡 플레이트(151) 사이에 위치한다. 상기 단락 플레이트(155)는 아래로 볼록한 라운드부와, 캡 플레이트(151)에 고정된 테두리부를 포함하는 반전 플레이트로 이루어질 수 있다. 따라서, 상기 단락 플레이트(155)는 상기 캡 플레이트(151)와 전기적으로 연결된다. 또한, 상기 단락 플레이트(155)는 이차 전지(100)에 과충전이 발생하여 내부 압력이 설정 압력보다 커지면 반전되어 위로 볼록하게 돌출되어, 단자 플레이트(133)에 접촉하여 단락을 유발시킨다. 즉, 상기 단락 플레이트(155)는 케이스(120) 내부의 압력이 설정 압력보다 커지면 반전되어, 상기 캡 플레이트(151)와 제 1 단자(132)를 단락시키는 역할을 한다. 상기 단락이 유발되면 큰 전류가 흐르게 되고 열이 발생하며, 이때 퓨즈홀(141d)이 형성된 영역이 용융, 절단되어 되어 퓨즈 기능을 함으로써, 이차 전지(100)의 안전성을 향상시킨다.The shorting plate 155 is disposed in the shorting hole 151c of the cap plate 151 and is located between the insulating member 134 of the second terminal unit 130 and the cap plate 151. [ The shorting plate 155 may include an inverting plate including a downwardly convex round portion and a rim portion fixed to the cap plate 151. Therefore, the shorting plate 155 is electrically connected to the cap plate 151. In addition, when the secondary battery 100 is overcharged and the internal pressure of the secondary battery 100 is higher than the predetermined pressure, the shorting plate 155 is inverted and protrudes upward to contact the terminal plate 133 to cause a short circuit. That is, the shorting plate 155 is reversed when the pressure inside the case 120 is larger than the set pressure, thereby shorting the cap plate 151 and the first terminal 132. If the short circuit is caused, a large current flows and heat is generated. At this time, the region where the fuse hole 141d is formed is melted and cut to function as a fuse, thereby improving the safety of the secondary battery 100.
상기 버스바 연결부(160)는 상기 제 1 전극 단자부(130)와 전기적으로 연결되며, 버스바(170)가 접속되는 부분이다. 상기 버스바 연결부(160)는 연장부(161)와 연장부(161)로부터 절곡된 절곡부(162)를 포함한다. 여기서, 상기 버스바 연결부(160)는 제 1 집전판(111), 즉 음극과 전기적으로 연결되므로, 음극 버스바 연결부(160) 또는 제 1 버스바 연결부(160)라고 정의할 수 있다. The bus bar connecting part 160 is electrically connected to the first electrode terminal part 130 and is connected to the bus bar 170. The bus bar connecting portion 160 includes a bent portion 162 bent from the extending portion 161 and the extending portion 161. The bus bar connecting portion 160 may be defined as a cathode bus bar connecting portion 160 or a first bus bar connecting portion 160 since the bus bar connecting portion 160 is electrically connected to the first collector plate 111,
상기 연장부(161)는 상기 단자 플레이트(133)와 전기적으로 접속되며, 상기 단자 플레이트(133)로부터 수평 방향으로 연장되게 형성된다. 여기서, 상기 연장부(161)는 캡 플레이트(151)와 평행하며, 캡 플레이트(151)의 외측을 향해 연장되도록 형성된다. 즉, 상기 연장부(161)는 상기 단자 플레이트(133)의 외측에 결합되며, 상기 단자 플레이트(133)와 동일한 면을 이루도록 평평한 플레이트 형상으로 형성된다. 이때, 단자 플레이트(133)와 연장부(161)가 접촉하는 면을 용접함으로써, 상기 연장부(161)가 단자 플레이트(133)에 전기적으로 접속될 수 있다. 또한, 상기 연장부(161)의 일부는 상기 절연 부재(134)의 상부에 걸쳐질 수 있다. The extended portion 161 is electrically connected to the terminal plate 133 and extends horizontally from the terminal plate 133. The extended portion 161 is parallel to the cap plate 151 and extends toward the outside of the cap plate 151. That is, the extension portion 161 is coupled to the outside of the terminal plate 133 and is formed in a flat plate shape so as to form the same surface as the terminal plate 133. At this time, the extended portion 161 can be electrically connected to the terminal plate 133 by welding the surface on which the terminal plate 133 and the extended portion 161 contact. In addition, a portion of the extension 161 may extend over the top of the insulating member 134.
상기 절곡부(162)는 상기 연장부(161)로부터 절곡되며 상기 케이스(120)의 하부로 연장된다. 상기 절곡부(162)는 상기 케이스(120)의 단측면(124)과 평행하게 형성된다. 상기 절곡부(162)에는 버스바(170)가 접속될 수 있다. 여기서, 상기 절곡부(162)에 접속되는 버스바(170)는 음극 버스바(171) 또는 제 1 버스바(171)라고 정의될 수 있다. 또한, 상기 케이스(120)는 제 2 전극 단자부(140)와 전기적으로 연결되어 있으므로, 양극 버스바(172) 또는 제 2 버스바(172)는 케이스(120)의 단측면(124)에 직접적으로 접속될 수 있다. 여기서, 버스바(170)는 다수의 이차 전지를 서로 직렬 또는 병렬로 연결시켜 하나의 배터리 팩을 형성할 수 있다. 상기 버스바(170)는 상기 버스바 연결부(160) 및 케이스(120)의 단측면(124)에 각각 용접될 수 있다. 따라서, 상기 버스바(170)는 상기 케이스(120)의 단측면(124)과 평행하게 형성된다. The bent portion 162 is bent from the extended portion 161 and extends to the lower portion of the case 120. The bent portion 162 is formed parallel to the short side surface 124 of the case 120. A bus bar 170 may be connected to the bent portion 162. Here, the bus bar 170 connected to the bent portion 162 may be defined as a negative bus bar 171 or a first bus bar 171. Since the case 120 is electrically connected to the second electrode terminal part 140, the anode bus bar 172 or the second bus bar 172 is directly connected to the short side 124 of the case 120 Can be connected. Here, the bus bar 170 may form a single battery pack by connecting a plurality of secondary batteries to each other in series or in parallel. The bus bar 170 may be welded to the bus bar connecting part 160 and the short side 124 of the case 120, respectively. Therefore, the bus bar 170 is formed parallel to the short side surface 124 of the case 120.
또한, 상기 제 1 버스바 연결부(160)와 상기 캡 플레이트(151) 및 케이스(120)의 단측면(124) 사이에는 절연부(165)가 형성되어, 상기 제 1 버스바 연결부(160)와 캡 플레이트(151) 및 케이스(120) 사이를 절연시킨다. 상기 절연부(165)는 상기 연장부(161)와 캡 플레이트(151) 사이 및 절곡부(162)와 케이스(120)의 단측면(124) 사이에 위치한다. 상기 절연부(165)는 절연성 재질로 이루어진다. An insulating portion 165 is formed between the first bus bar connecting portion 160 and the end surface 124 of the cap plate 151 and the case 120 so that the first bus bar connecting portion 160, The cap plate 151 and the case 120 are insulated. The insulating portion 165 is located between the extension portion 161 and the cap plate 151 and between the bent portion 162 and the short side surface 124 of the case 120. The insulating portion 165 is made of an insulating material.
이와 같이, 본 발명의 일 실시예에 따른 이차 전지(100)는 제 1 단자(132)와 전기적으로 연결된 버스바 연결부(160)를 캡 플레이트(151)로부터 케이스(120)의 측면(124)으로 연장시켜 형성함으로써, 이차 전지(100)의 높이를 줄여 높이 방향의 공간을 감소시킬 수 있다. As described above, the secondary battery 100 according to the embodiment of the present invention includes the bus bar connecting portion 160 electrically connected to the first terminal 132 from the cap plate 151 to the side surface 124 of the case 120 The height of the secondary battery 100 can be reduced and the space in the height direction can be reduced.
또한, 종래에는 전극 단자를 케이스의 측면으로(즉, 캡 플레이트를 케이스의 측면으로 이동시키는 구조) 형성해야 할 때 측면의 좁은 공간 제약 때문에 전극 단자 외에 안전 벤트 및 단락 플레이트 등의 구조물을 형성하지 못하는 경우가 있었다. 그러나, 본 발명은 제 1 단자(132)와 전기적으로 연결된 버스바 연결부(160)를 케이스(120)의 측면(124)으로 연장시킴으로써, 안전 벤트(154)와 단락 플레이트(155)를 캡 플레이트(151)에 형성하면서도 제 1 단자(132)가 케이스(120)의 측면(124)에 위치하는 것과 같은 효과를 볼 수 있다. In addition, conventionally, when the electrode terminal is to be formed on the side of the case (i.e., the structure in which the cap plate is moved to the side of the case), it is difficult to form a structure such as a safety vent and a short- There was a case. The safety vent 154 and the shorting plate 155 may be connected to the cap plate (not shown) by extending the bus bar connecting portion 160 electrically connected to the first terminal 132 to the side surface 124 of the case 120. However, 151 and the first terminal 132 is located on the side surface 124 of the case 120. In this case,
도 5는 본 발명의 다른 실시예에 따른 이차 전지를 도시한 사시도이다.5 is a perspective view illustrating a secondary battery according to another embodiment of the present invention.
도 5에 도시된 이차 전지(200)는 도 1에 도시한 이차 전지(100)에서 제 2 버스바 연결부(260)가 더 형성된 것 외에 나머지 구성요소는 동일하다. The secondary battery 200 shown in FIG. 5 is the same as the secondary battery 100 shown in FIG. 1 except that the second bus bar connecting portion 260 is further formed.
도 5를 참조하면, 본 발명의 다른 실시예에 따른 이차 전지(200)에서 제 2 버스바(172)는 케이스(120)에 직접적으로 접속된 것이 아니라, 별도의 제 2 버스바 연결부(260)를 통해 접속된다. 상기 제 2 버스바 연결부(260)는 대략 사각형의 플레이트 형태로 형성되며, 상기 케이스(120)의 단측면(124)에 전기적으로 접속된다. 여기서, 제 2 전극 단자부(140)가 캡 플레이트(151) 및 케이스(120)에 전기적으로 연결되어 있으므로, 상기 케이스(120)의 단측면(124)에 접속된 제 2 버스바 연결부(260)도 제 2 전극 단자부(140)와 동일한 극성, 즉 양극을 갖는다. 따라서, 상기 제 2 버스바 연결부(260)는 양극 버스바 연결부라고 불리기도 한다. 또한, 상기 제 2 버스바 연결부(260)에는 제 2 버스바(172)가 접속된다. 이와 같이, 케이스(120)의 단측면(124)에 별도의 제 2 버스바 연결부(260)를 형성하면, 케이스(120)의 단측면(124)을 장측면(123) 및 바닥면(121)에 비해 두껍게 형성할 필요가 없게 된다.5, the second bus bar 172 of the rechargeable battery 200 according to another embodiment of the present invention is not directly connected to the case 120 but includes a separate second bus bar connection part 260, Lt; / RTI > The second bus bar connection part 260 is formed in a substantially rectangular plate shape and is electrically connected to the short side surface 124 of the case 120. Since the second electrode terminal portion 140 is electrically connected to the cap plate 151 and the case 120, the second bus bar connecting portion 260 connected to the short side surface 124 of the case 120 And has the same polarity as the second electrode terminal portion 140, that is, an anode. Accordingly, the second bus bar connecting part 260 may be referred to as a positive bus bar connecting part. A second bus bar 172 is connected to the second bus bar connection part 260. When the second bus bar connecting portion 260 is formed on the short side 124 of the case 120 as described above, the short side surface 124 of the case 120 is divided into the long side surface 123 and the bottom surface 121, It is not necessary to form it thick.
이상에서 설명한 것은 본 발명에 의한 이차 전지를 실시하기 위한 하나의 실시예에 불과한 것으로서, 본 발명은 상기한 실시예에 한정되지 않고, 이하의 특허청구범위에서 청구하는 바와 같이 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능한 범위까지 본 발명의 기술적 정신이 있다고 할 것이다.It is to be understood that the present invention is not limited to the above-described embodiments, but may be modified in various ways within the scope of the present invention as set forth in the following claims It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (10)

  1. 제 1 전극판, 제 2 전극판 및 상기 제 1 전극판과 제 2 전극판 사이에 형성된 세퍼레이터로 이루어진 전극 조립체;An electrode assembly comprising a first electrode plate, a second electrode plate, and a separator formed between the first electrode plate and the second electrode plate;
    상기 전극 조립체가 삽입되며, 바닥면과 상기 바닥면으로부터 상부로 연장된 측면을 갖는 케이스;A case having the electrode assembly inserted therein and having a bottom surface and a side extending upward from the bottom surface;
    상기 케이스의 상부에 결합된 캡 플레이트;A cap plate coupled to an upper portion of the case;
    상기 제 1 전극판과 전기적으로 연결되며, 상기 캡 플레이트를 관통하여 형성된 제 1 전극 단자부; 및A first electrode terminal portion electrically connected to the first electrode plate and formed through the cap plate; And
    상기 제 1 전극 단자부와 전기적으로 연결되며, 상기 캡 플레이트의 상부에서 상기 케이스의 측면으로 연장되어 형성된 제 1 버스바 연결부를 포함하는 것을 특징으로 하는 이차 전지.And a first bus bar connection part electrically connected to the first electrode terminal part and extending from a top of the cap plate to a side of the case.
  2. 제 1 항에 있어서,The method according to claim 1,
    상기 제 1 버스바 연결부와 상기 캡 플레이트 및 상기 케이스의 측면 사이에는 절연부가 형성된 것을 특징으로 하는 이차 전지.And an insulating portion is formed between the first bus bar connecting portion and the side surfaces of the cap plate and the case.
  3. 제 1 항에 있어서,The method according to claim 1,
    상기 제 1 전극 단자부는The first electrode terminal portion
    상기 제 1 집전판과 전기적으로 접속된 제 1 집전부;A first current collector electrically connected to the first current collector plate;
    상기 제 1 집전부와 결합되며, 상기 캡 플레이트를 관통하여 형성된 제 1 단자;A first terminal coupled to the first current collector and formed through the cap plate;
    상기 제 1 단자의 상부에 결합된 단자 플레이트; 및A terminal plate coupled to an upper portion of the first terminal; And
    상기 단자 플레이트와 상기 캡 플레이트 사이에 형성된 절연 부재를 포함하는 것을 특징으로 하는 이차 전지.And an insulating member formed between the terminal plate and the cap plate.
  4. 제 3 항에 있어서,The method of claim 3,
    상기 제 1 버스바 연결부는 The first bus bar connection part
    상기 단자 플레이트에 전기적으로 접속되며 수평 방향으로 연장된 연장부; 및An extension extending in the horizontal direction and electrically connected to the terminal plate; And
    상기 연장부로부터 절곡되고 상기 케이스의 하부로 연장되어, 상기 케이스의 측면과 평행하게 형성된 절곡부를 포함하는 것을 특징으로 하는 이차 전지.And a bent portion bent from the extended portion and extending to a lower portion of the case, the bent portion being formed in parallel with a side surface of the case.
  5. 제 4 항에 있어서,5. The method of claim 4,
    상기 절곡부에 전기적으로 접속된 제 1 버스바를 더 포함하는 것을 특징으로 하는 이차 전지.And a first bus bar electrically connected to the bent portion.
  6. 제 5 항에 있어서,6. The method of claim 5,
    상기 제 2 전극판과 전기적으로 연결되며, 상기 캡 플레이트의 하면에 전기적으로 접속된 제 2 전극 단자부와,A second electrode terminal portion electrically connected to the second electrode plate and electrically connected to a lower surface of the cap plate,
    상기 케이스의 측면에 전기적으로 접속되고, 상기 제 1 버스바와 이격되어 평행하게 배열된 제 2 버스바를 더 포함하는 것을 특징으로 하는 이차 전지.And a second bus bar electrically connected to a side surface of the case and arranged in parallel to the first bus bar and spaced apart from the first bus bar.
  7. 제 6 항에 있어서,The method according to claim 6,
    상기 제 2 버스바와 상기 케이스의 측면 사이에는 제 2 버스바 연결부가 더 형성된 것을 특징으로 하는 이차 전지.And a second bus bar connection portion is further formed between the second bus bar and the side surface of the case.
  8. 제 3 항에 있어서,The method of claim 3,
    상기 단자 플레이트의 하부에 위치한 캡 플레이트에 설치되며, 상기 케이스 내부의 압력이 설정 압력보다 커지면 반전되어 상기 캡 플레이트와 상기 단자 플레이트 사이를 단락시키는 단락 플레이트를 더 포함하는 것을 특징으로 하는 이차 전지.Further comprising a shorting plate installed on a cap plate disposed below the terminal plate and shorting the cap plate and the terminal plate when the pressure inside the case is greater than a predetermined pressure.
  9. 제 1 항에 있어서,The method according to claim 1,
    상기 케이스의 측면은 한 쌍의 장측면과, 상기 한 쌍의 장측면을 연결하며 상기 한 쌍의 장측면에 비해 면적이 좁은 한 쌍의 단측면을 포함하고,Wherein the side surface of the case includes a pair of long side surfaces and a pair of short side surfaces connecting the pair of long side surfaces and narrower in area than the pair of long side surfaces,
    상기 제 1 버스바 연결부는 상기 한 쌍의 단측면과 평행하게 형성된 것을 특징으로 하는 이차 전지.And the first bus bar connecting portion is formed parallel to the pair of short side surfaces.
  10. 제 9 항에 있어서,10. The method of claim 9,
    상기 한 쌍의 단측면의 두께는 상기 한 쌍의 장측면의 두께보다 두껍게 형성된 것을 특징으로 하는 이차 전지.Wherein a thickness of the pair of short side surfaces is greater than a thickness of the pair of long side surfaces.
PCT/KR2018/009257 2017-09-07 2018-08-13 Secondary battery WO2019050180A1 (en)

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