WO2014003474A1 - Battery pack - Google Patents

Battery pack Download PDF

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Publication number
WO2014003474A1
WO2014003474A1 PCT/KR2013/005738 KR2013005738W WO2014003474A1 WO 2014003474 A1 WO2014003474 A1 WO 2014003474A1 KR 2013005738 W KR2013005738 W KR 2013005738W WO 2014003474 A1 WO2014003474 A1 WO 2014003474A1
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WO
WIPO (PCT)
Prior art keywords
gas
electrode assembly
battery
battery pack
connection mold
Prior art date
Application number
PCT/KR2013/005738
Other languages
French (fr)
Inventor
Tae Il Kim
Kwan Yong Kim
Original Assignee
Sk Innovation 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 Sk Innovation Co.,Ltd. filed Critical Sk Innovation Co.,Ltd.
Publication of WO2014003474A1 publication Critical patent/WO2014003474A1/en

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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
    • H01M50/30—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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • 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
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/557—Plate-shaped terminals
    • 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 battery pack, and more particularly, to a battery pack capable of increasing safety and improving a riding environment by efficiently discharging gas generated from a unit battery.
  • a chargeable/dischargeable secondary battery has been recently and widely used as an energy source of a wireless mobile device.
  • the secondary battery has been prominent as a power source of an electric vehicle (EV), a hybrid electric vehicle (HEV), and the like, that have been suggested as a scheme for solving air pollution of an existing gasoline vehicle, diesel vehicle, and the like using a fossil fuel.
  • EV electric vehicle
  • HEV hybrid electric vehicle
  • Small-sized mobile devices use one or more battery cells per one device.
  • medium and large-sized devices such as a vehicle and the like, use a medium and large-sized battery pack as a unit battery in which a plurality of battery cells are electrically interconnected.
  • the medium and large-sized battery packs are preferably manufactured to have a size and weight as small as possible
  • the medium and large-sized battery packs may be stacked with a high degree of integration and a square type battery, a pouch type battery, and the like having a small weight in terms of capacity are widely used as the battery cell of the medium and large-sized battery packs.
  • the pouch type battery having a small weight, low possibility of leaking an electrolyte, and chief manufacturing cost has particularly attracted attention.
  • the above-mentioned inner gas contains toxic ingredients such as carbon monoxide and the like.
  • the gas discharged from the battery cell and a refrigerant flowing in the battery pack are mixed, cooling efficiency is decreased and a problem in terms of safety is caused.
  • the inner gas generated from the battery cell is introduced into a riding space during a circulation of the refrigerant, thereby making it possible to cause injury to a human body.
  • US Patent Laid-Open Publication No. 2011-0104527 (laid-open published on May 5, 2011, entitled: SECONDARY BATTERY HAVING SEALING PORTION OF NOVEL STRUCTURE) discloses a secondary battery in which an exhaustion guide sealing part having a structure in which a width becomes narrow from an inner side direction of a sealing part to an outer side direction thereof is formed so that sealing force may be preferentially released and high-pressure gas may be discharged to the outside when the high-pressure gas in the battery cell is generated at the sealing part on an outer peripheral surface of an electrode assembly receiving part of an electrode case.
  • An object of the present invention is to provide a battery pack capable of increasing safety and improving a riding environment by efficiently discharging gas generated from a unit battery.
  • a battery pack includes: a plurality of stacked battery modules received in a battery pack case, including: a first electrode assembly and a second electrode assembly having electrode tabs including an anode tab and a cathode tab formed to be extended from an anode plate and a cathode plate and sealed by a pouch so that the electrode tab is exposed to the outside; a battery case having one side opened in a height direction so that the first electrode assembly and the second electrode assembly are received therein; a connection mold inserted between the electrode tabs of the first electrode assembly and the second electrode assembly and the pouch to thereby connect a plurality of terminals formed on one side to the electrode tabs, and including a gas collection part formed so as to be penetrated in a height direction; and an upper cap coupled to the connection mold at the opened side of the battery case and having a gas discharging part formed therein communicating with the gas collection part; and a gas guide pipe formed to be extended in a length direction so as to be communicated with the gas discharging part of the battery
  • the battery module may have a structure in the connection mold that a gas discharging pipe is protrudedly formed at one side in a height direction of a region in which the gas collection part is formed, and the gas discharging part is formed to be hollowed at a location corresponding to the gas discharging pipe of the upper cap.
  • the gas guide pipe may have an insertion hole formed therein so that the gas discharging pipe is insertedly coupled to the insertion hole.
  • the gas guide pipe may have a gas discharging pipe protrudedly formed therefrom so as to be insertedly coupled to the gas collection part.
  • a battery pack includes: a plurality of stacked battery modules received in a battery pack case, including: a first electrode assembly and a second electrode assembly having electrode tabs including an anode tab and a cathode tab formed to be extended from an anode plate and a cathode plate and sealed by a pouch so that the electrode tab is exposed to the outside; a battery case having one side opened in a height direction so that the first electrode assembly and the second electrode assembly are received therein; a first connection mold inserted between the electrode tabs of the first electrode assembly and the second electrode assembly and the pouch and including a gas channel formed so as to be penetrated in a height direction; a second connection mold coupled to the first connection mold at one side positioned in a direction opposite to the direction in which the first connection mold is inserted between the electrode tabs, having a plurality of terminals formed on one side so as to be connected to the electrode tabs, and including a gas collection part formed so as to be communicated with the gas channel; and an upper cap coupled
  • the battery module may have a structure in the second connection mold that a gas discharging pipe is protrudedly formed at one side in a height direction of a region in which the gas collection part is formed, and the gas discharging part is formed to be hollowed at a location corresponding to the gas discharging pipe of the upper cap.
  • the gas guide pipe may have an insertion hole formed therein so that the gas discharging pipe is insertedly coupled to the insertion hole.
  • the gas guide pipe may have a gas discharging pipe protrudedly formed therefrom so as to be insertedly coupled to the gas collection part.
  • the battery pack according to the embodiment of the present invention relates to a battery pack capable of increasing safety and improving a riding environment by efficiently discharging gas generated from a unit battery.
  • the battery pack according to the embodiment of the present invention has the electrode assembly firmly fixed in the battery case to thereby improve the safety, and has the battery cells fixed in a compact case to thereby make better utilize a space and to easily perform electrical connection between the electrode tabs of the battery cell.
  • FIG.1 is a perspective view showing a battery pack according to an embodiment of the present invention.
  • FIG.2 is a perspective view showing an electrode assembly according to an embodiment of the present invention.
  • FIG.3 is an exploded perspective view showing a battery module of the battery pack according to the embodiment of the present invention.
  • FIG.4 is a perspective view showing the battery module of FIG.3;
  • FIG.5 is a cross-sectional view taken along a direction a-a’ of FIG.4;
  • FIG.6 is an exploded perspective view of the battery pack showing a form in which the battery module of FIG. 4 and a gas guide pipe are coupled to each other;
  • FIG.7 is a cross-sectional view taken along a direction b-b’ of FIG.1;
  • FIG.8 is an exploded perspective view showing a form in which another battery module and the gas flow pipe are coupled to each other according to the embodiment of the present invention.
  • FIG.9 is a cross-sectional view taken along a direction c-c’ of FIG.8;
  • FIG.10 is an exploded perspective view showing a battery module of another battery pack according to the embodiment of the present invention.
  • FIG.11 is an exploded perspective view showing a first connection mold and a second connection mold of FIG. 10;
  • FIG.12 is a cross-sectional view taken along a direction d-d’ of FIG. 10.
  • FIG. 1 is a perspective view showing a battery pack according to an embodiment of the present invention
  • FIG. 2 is a perspective view showing an electrode assembly according to an embodiment of the present invention
  • FIG. 3 is an exploded perspective view showing a battery module of the battery pack according to the embodiment of the present invention
  • FIG. 4 is a perspective view showing the battery module of FIG. 3
  • FIG. 5 is a cross-sectional view taken along a direction a-a’ of FIG. 4
  • FIG. 6 is an exploded perspective view of the battery pack showing a form in which the battery module of FIG. 4 and a gas flow pipe are coupled to each other
  • FIG. 7 is a cross-sectional view taken along a direction b-b’ of FIG. 1, FIG.
  • FIG. 8 is an exploded perspective view showing a form in which another battery module and the gas flow pipe are coupled to each other according to the embodiment of the present invention
  • FIG. 9 is a cross-sectional view taken along a direction c-c’ of FIG. 8
  • FIG. 10 is an exploded perspective view showing a battery module of another battery pack according to the embodiment of the present invention
  • FIG. 11 is an exploded perspective view showing a first connection mold and a second connection mold of FIG. 10
  • FIG. 12 is a cross-sectional view taken along a direction d-d’ of FIG. 10.
  • a battery pack 1 has a plurality of stacked battery modules 10 received in a battery pack case 2, wherein the battery module 10 is formed to mainly include a first electrode assembly 110, a second electrode assembly 120, a battery case 300, a connection mold 500, and an upper cap 400.
  • the first electrode assembly 110 and the second electrode assembly 120 is formed so that an anode tab 210 is formed to be extended from an anode plate, a cathode tab 220 is formed to be extended from a cathode plate, and an electrode tab 200 including the anode tab 210 and the cathode tab 220 is sealed by a pouch 130 to be exposed to the outside.
  • first electrode assembly 110 and the second electrode assembly 120 are stacked in parallel with each other so that the electrode tabs 200 face each other and the electrode tab 200 of the first electrode assembly 110 and the electrode tab 200 of the second electrode assembly 120 are spaced apart from each other by a predetermined distance without being in contact with each other by thicknesses of the anode plate and the cathode plate 142.
  • the battery case 300 is formed so that an upper side or both sides thereof is opened in a height direction and the first electrode assembly 110 and the second electrode assembly 120 which are stacked are inserted into and received in the battery case 300.
  • the battery case 300 may be formed by a metal plate having a thin thickness of 0.1mm to 1.0mm and may be formed so as to easily adhere the first electrode assembly 110 and the second electrode assembly 120 received in the case to each other by having a form in which a central portion of both sides in a width direction is inwardly recessed or having a plurality of grooves formed to be inwardly recessed.
  • the battery module 10 may be formed to further include a lower cap closing a lower side of the battery case 300.
  • the lower cap may be formed in a form in which an interior thereof is hollowed and an upper side thereof is opened and may be coupled so that the lower side of the battery case 300 is inserted into the hollowed inner region, thereby making it possible to close the lower side of the battery case.
  • the battery case 300 may be formed to be shorter than the first electrode assembly 110 and the second electrode assembly 120 so that the electrode tab200 may be protruded to an upper side in a state in which the first electrode assembly 110 and the second electrode assembly 120 are received in the battery case 300.
  • connection mold 500 is inserted between the electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130, and is formed so that a plurality of terminals 510 formed on one side are connected to the electrode tab 200.
  • connection mold 500 is formed so that the gas generated from the first electrode assembly 110 and the second electrode assembly120 is collected in a gas collection part 560 by including the gas collection part 560 formed to be penetrated in a height direction.
  • the terminals 510 are electrically connected to the electrode tab 200 by welding.
  • connection mold 500 since the connection mold 500 is inserted between the facing electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130, it presses the electrode tabs 200 in a width direction of the connection mold 500 to be easily welded to the terminals 510, serves to fix the terminals 510 connected to the electrode tabs 200, and discharges the gas generated from the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130 to the outside through the gas collection part 560.
  • the battery module 10 applies a hotmelt, an adhesive, or the like to a space between the pouches 130 of the first electrode assembly 110 and the second electrode assembly 120 before the connection mold 500 is inserted thereinto and may then insert and fix the connection mold 500 thereinto.
  • the upper cap400 is formed so that an interior thereof is hollowed and the lower side thereof is opened, and is coupled to an upper side of the connection mold 500 after the connection mold 500 is inserted and coupled between the first electrode assembly 110 and the second electrode assembly 120.
  • the upper cap 400 is coupled to the battery case 300 while enclosing some regions on upper sides of the first electrode assembly 110 and the second electrode assembly 120 from the outside.
  • the upper cap 400 has a gas discharging part communicating with the gas collection part 560, formed at a location corresponding to a location at which the gas collection part 560 is formed and includes a cutting part formed by hollowing regions corresponding to locations at which the terminals 510 are formed so that the terminals 510 of the connection mold 500 are exposed to the outside.
  • the first electrode assembly 110 and the second electrode assembly 120 have a structure that the pouches 130 of a side at which the electrode tab200 is formed may be closely adhered by the connection mold 500 and the battery case 300.
  • the battery module 10 has a structure that the pouch 130 and the electrode tab 200 are strongly adhered to each other by pressurizing an outerside of a predetermined region of an upper portion of the pouch 130 having the electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 formed thereon in the width direction from both sides by the connection mold 500 and the battery case 300 and the gas generated from an inner portion of the first electrode assembly 110 and the second electrode assembly 120 may be collected only into the gas collection part 560 while not being leaked into the pouch 130 of the side at which the electrode tab 200 is formed.
  • the pouch 130 is pressurized in the width direction also by the upper cap 400 coupled to the outside of the battery case 300 and may be closely adhered to the electrode tab 200.
  • the battery pack 1 according to the embodiment of the present invention has a configuration that a plurality of battery modules 10 having characteristics as described above are stacked and are received in the battery pack case 2 and a gas flow pipe is formed to be extended in a length direction of the battery pack 1 so as to be communicated with the gas discharging part formed on the upper cap 400 and the gas collection part 560 of the connection mold 500.
  • the battery module 10 has a structure in the connection mold 500 that a gas discharging pipe 570 is protrudedly formed at an upper side of a region in which the gas collection part 560 is formed, and the gas discharging part may be formed to be hollowed at the location corresponding to the gas discharging pipe 570 of the upper cap 400.
  • a gas guide pipe 4 may be provided with an insertion hole 5 so that the gas discharging pipe 570 is insertedly coupled to the insertion hole 5.
  • the gas discharging pipe 570 may be inserted into the gas discharging part in a state in which the connection mold 500 and the upper cap 400 are coupled to each other to thereby be protruded toward the upper side, and may be insertedly coupled to the insertion hole 5 of the gas guide pipe 4 to thereby discharge the gas to an inner portion of the gas guide pipe 4.
  • the gas guide pipe 4 may be provided with the gas discharging pipe 570 to be protruded therefrom, such that the gas discharging pipe 570 is insertedly coupled to the gas collection part 560.
  • the battery pack 1 is formed so that the gas generated from the unit battery, that is, the first electrode assembly 110 and the second electrode assembly 120 is discharged to the gas flow pipe through the gas collection part 560, thereby making it possible to improve safety by preventing explosion of the battery and to efficiently improve a riding environment by causing the gas not to affect passengers riding in the vehicle
  • the battery pack 1 according to the embodiment of the present invention is formed in a compact structure, thereby making it possible to rapidly discharge the gas generated from the unit battery by a swelling phenomenon to a designated external path, that is, the gas collection part 560.
  • a battery pack 1 may be formed so that a battery module 10 includes a first electrode assembly 110, a second electrode assembly 120, a battery case 300, a first connection mold 500a, a second connection mold 500b, and an upper cap 400.
  • the first connection mold 500a is inserted between the electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130, and includes a gas channel formed to be penetrated in the height direction.
  • the second connection mold 500b is coupled to the first connection mold 500a at an upper side of the first connection mold 500a, has a plurality of terminals 510 formed on an upper side thereof connected to the electrode tab 200, and includes the gas collection part 560 formed to be communicated with the gas channel.
  • the first connection mold 500a may be formed so that a predetermined region of both sides is recessed inwardly in a width direction thereof to thereby form a gas discharging groove 550 and the gas discharging groove 550 is communicated with the gas collection part 560 when being coupled to the second connection mold 500b.
  • the gas discharging groove 550 formed at the central portion of both sides in the width direction of the first connection mold 500a is disposed between the anode tab 210 and the cathode tab 220, and serves as a gas flow passage so that the gas may be discharged through the pouch 130 disposed between the anode tab 210 and the cathode tab 220 and may be moved to the gas collection part 560.
  • the first connection mold 500a has a structure that hollow parts 520 having opened upper surfaces are formed at both sides in a length direction around the gas discharging groove 550 and coupling holes 521 having a predetermined region hollowed are formed at both sides in a width direction of the hollow part 520
  • the second connection mold 500b has a structure that hooks 540 inserted into the hollow parts 520 of the first connection mold 500a to be clip-coupled to the coupling holes 521 may be protrudedly formed at both sides of a lower side around the gas collection part 560.
  • the first connection mold 500a is insertedly fixed between the electrode tab 200 of the first electrode assembly 110 and the electrode tab200 of the second electrode assembly 120 and may be then press-fitted with the second connection mold 500b at the upper side thereof.
  • the battery module 10 as described above is easily fixed between the first electrode assembly 110 and the second electrode assembly 120 as compared to the case in which the connection mold 500 is integrally formed in the battery module 10 shown in FIG. 3.
  • the first connection mold 500a is inserted and fixed therebetween and the second connection mold 500b is coupled to the first connection mold 500a, thereby making it possible to significantly improve assembly performance.
  • the second connection mold 500b has a configuration that guides 541 protruded so as to contact with both sides in the length direction of the hollow parts 520 are formed to be protruded at both sides in the length direction in which the hooks 540 are formed, such that when the hook 540 is inserted into the hollow part 520 of the first connection mold 500a, there is no need to separately align the location of the hook 540 so as to be inserted and clip-coupled to the coupling hole 521, thereby making it possible to simply couple the second connection mold 500b to the first connection mold 500a.
  • the first connection mold 500a has fixed blades 530 formed to be protruded at both sides of the width direction thereof or both sides of the length direction thereof, such that when the first connection mold 500a is inserted between the first electrode assembly 110 and the second electrode assembly 120, it is put on the pouch 130 which is upper side edge portions of the first electrode assembly 110 and the second electrode assembly 120.
  • the first connection mold 500a may easily maintain horizontality with the first electrode assembly 110 and the second electrode assembly 120 and may maintain a constant inserted depth, such that the electrode tab200 may be coupled to the terminals 510 formed on the second connection mold 500b at exact locations.
  • the battery module 10 has a structure in the second connection mold 500b that a gas discharging pipe 570 is protrudedly formed at one side in a height direction of a region in which the gas collection part 560 is formed, and the gas discharging part may be formed to be hollowed at the location corresponding to the gas discharging pipe 570 of the upper cap 400.
  • a gas guide pipe 4 may be provided with an insertion hole 5 so that the gas discharging pipe 570 is insertedly coupled thereto, such that the gas discharging pipe 570 coupled to the upper cap 400 to be exposed to the upper side of the gas discharging part may be inserted into the insertion hole 5.
  • the battery module 10 has a structure that the gas collection part 560 and the gas discharging part of the second connection mold 500b are formed in a hollowed hole state and the gas discharging pipe 570 is formed to be protruded from the gas guide pipe 4 and is coupled to the gas collection part 560.
  • the order of coupling the battery pack 1 according to the embodiment of the present invention will be described with reference to FIG. 1.
  • the plurality of battery modules 10 in the assembled state are stacked on and inserted into the battery pack case 2, the battery module 10 is fixed in the battery pack case 2 by finishing edges of both sides of an upper side of the battery pack case with side cases 3, the gas discharging pipe 570 protruded upwardly of each battery module 10 is insertedly fixed to the insertion hole 5 formed at the gas guide pipe 4.
  • the gas guide pipe 4 may be welded to be fixed to the gas discharging pipe 570, as needed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Battery Mounting, Suspending (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

The present invention relates to a battery pack, and more particularly, to a battery pack capable of increasing safety and improving a riding environment by efficiently discharging gas generated from a unit battery.

Description

BATTERY PACK
The present invention relates to a battery pack, and more particularly, to a battery pack capable of increasing safety and improving a riding environment by efficiently discharging gas generated from a unit battery.
A chargeable/dischargeable secondary battery has been recently and widely used as an energy source of a wireless mobile device.
In addition, the secondary battery has been prominent as a power source of an electric vehicle (EV), a hybrid electric vehicle (HEV), and the like, that have been suggested as a scheme for solving air pollution of an existing gasoline vehicle, diesel vehicle, and the like using a fossil fuel.
Small-sized mobile devices use one or more battery cells per one device. In contrast, due to necessity of high output and large capacity, medium and large-sized devices such as a vehicle and the like, use a medium and large-sized battery pack as a unit battery in which a plurality of battery cells are electrically interconnected.
Since the medium and large-sized battery packs are preferably manufactured to have a size and weight as small as possible, the medium and large-sized battery packs may be stacked with a high degree of integration and a square type battery, a pouch type battery, and the like having a small weight in terms of capacity are widely used as the battery cell of the medium and large-sized battery packs. Among others, the pouch type battery having a small weight, low possibility of leaking an electrolyte, and chief manufacturing cost has particularly attracted attention.
Meanwhile, when the above-mentioned secondary battery is exposed to a high-temperature environment or an inner circuit short is generated in a battery cell due to malfunction, or the like, a decomposition reaction of an electrolyte occurs at an interface of a cathode, such that a large amount of gas is generated. As a result, when inner pressure is increased, a battery case becomes broken, such that the gas is discharged to the outside of the battery cell.
In general, the above-mentioned inner gas contains toxic ingredients such as carbon monoxide and the like. When the gas discharged from the battery cell and a refrigerant flowing in the battery pack are mixed, cooling efficiency is decreased and a problem in terms of safety is caused.
For example, in a case of a vehicle, the inner gas generated from the battery cell is introduced into a riding space during a circulation of the refrigerant, thereby making it possible to cause injury to a human body.
US Patent Laid-Open Publication No. 2011-0104527 (laid-open published on May 5, 2011, entitled: SECONDARY BATTERY HAVING SEALING PORTION OF NOVEL STRUCTURE) discloses a secondary battery in which an exhaustion guide sealing part having a structure in which a width becomes narrow from an inner side direction of a sealing part to an outer side direction thereof is formed so that sealing force may be preferentially released and high-pressure gas may be discharged to the outside when the high-pressure gas in the battery cell is generated at the sealing part on an outer peripheral surface of an electrode assembly receiving part of an electrode case.
However, even using the above-mentioned method, the problem of discharging the gas generated by the decomposition reaction of the electrolyte may not be satisfactorily solved. Therefore, the technology development for a battery module or the battery pack capable of easily discharging the gas generated from the unit battery has been still demanded.
An object of the present invention is to provide a battery pack capable of increasing safety and improving a riding environment by efficiently discharging gas generated from a unit battery.
In one general aspect, a battery pack includes: a plurality of stacked battery modules received in a battery pack case, including: a first electrode assembly and a second electrode assembly having electrode tabs including an anode tab and a cathode tab formed to be extended from an anode plate and a cathode plate and sealed by a pouch so that the electrode tab is exposed to the outside; a battery case having one side opened in a height direction so that the first electrode assembly and the second electrode assembly are received therein; a connection mold inserted between the electrode tabs of the first electrode assembly and the second electrode assembly and the pouch to thereby connect a plurality of terminals formed on one side to the electrode tabs, and including a gas collection part formed so as to be penetrated in a height direction; and an upper cap coupled to the connection mold at the opened side of the battery case and having a gas discharging part formed therein communicating with the gas collection part; and a gas guide pipe formed to be extended in a length direction so as to be communicated with the gas discharging part of the battery module.
The battery module may have a structure in the connection mold that a gas discharging pipe is protrudedly formed at one side in a height direction of a region in which the gas collection part is formed, and the gas discharging part is formed to be hollowed at a location corresponding to the gas discharging pipe of the upper cap.
The gas guide pipe may have an insertion hole formed therein so that the gas discharging pipe is insertedly coupled to the insertion hole.
The gas guide pipe may have a gas discharging pipe protrudedly formed therefrom so as to be insertedly coupled to the gas collection part.
In anther general aspect, a battery pack includes: a plurality of stacked battery modules received in a battery pack case, including: a first electrode assembly and a second electrode assembly having electrode tabs including an anode tab and a cathode tab formed to be extended from an anode plate and a cathode plate and sealed by a pouch so that the electrode tab is exposed to the outside; a battery case having one side opened in a height direction so that the first electrode assembly and the second electrode assembly are received therein; a first connection mold inserted between the electrode tabs of the first electrode assembly and the second electrode assembly and the pouch and including a gas channel formed so as to be penetrated in a height direction; a second connection mold coupled to the first connection mold at one side positioned in a direction opposite to the direction in which the first connection mold is inserted between the electrode tabs, having a plurality of terminals formed on one side so as to be connected to the electrode tabs, and including a gas collection part formed so as to be communicated with the gas channel; and an upper cap coupled to the second connection mold at the opened side of the battery case and having a gas discharging part formed therein communicating with the gas collection part; and a gas guide pipe formed to be extended in a length direction so as to be communicated with the gas discharging part of the battery module.
The battery module may have a structure in the second connection mold that a gas discharging pipe is protrudedly formed at one side in a height direction of a region in which the gas collection part is formed, and the gas discharging part is formed to be hollowed at a location corresponding to the gas discharging pipe of the upper cap.
The gas guide pipe may have an insertion hole formed therein so that the gas discharging pipe is insertedly coupled to the insertion hole.
The gas guide pipe may have a gas discharging pipe protrudedly formed therefrom so as to be insertedly coupled to the gas collection part.
The battery pack according to the embodiment of the present invention relates to a battery pack capable of increasing safety and improving a riding environment by efficiently discharging gas generated from a unit battery.
In addition, the battery pack according to the embodiment of the present invention has the electrode assembly firmly fixed in the battery case to thereby improve the safety, and has the battery cells fixed in a compact case to thereby make better utilize a space and to easily perform electrical connection between the electrode tabs of the battery cell.
The above and other objects, features and advantages of the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which:
FIG.1 is a perspective view showing a battery pack according to an embodiment of the present invention;
FIG.2 is a perspective view showing an electrode assembly according to an embodiment of the present invention;
FIG.3 is an exploded perspective view showing a battery module of the battery pack according to the embodiment of the present invention;
FIG.4 is a perspective view showing the battery module of FIG.3;
FIG.5 is a cross-sectional view taken along a direction a-a’ of FIG.4;
FIG.6 is an exploded perspective view of the battery pack showing a form in which the battery module of FIG. 4 and a gas guide pipe are coupled to each other;
FIG.7 is a cross-sectional view taken along a direction b-b’ of FIG.1;
FIG.8 is an exploded perspective view showing a form in which another battery module and the gas flow pipe are coupled to each other according to the embodiment of the present invention;
FIG.9 is a cross-sectional view taken along a direction c-c’ of FIG.8;
FIG.10 is an exploded perspective view showing a battery module of another battery pack according to the embodiment of the present invention;
FIG.11 is an exploded perspective view showing a first connection mold and a second connection mold of FIG. 10; and
FIG.12 is a cross-sectional view taken along a direction d-d’ of FIG. 10.
Hereinafter, a battery pack according to an embodiment of the present invention having the above-mentioned characteristics will be described in more detail with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a battery pack according to an embodiment of the present invention, FIG. 2 is a perspective view showing an electrode assembly according to an embodiment of the present invention, FIG. 3 is an exploded perspective view showing a battery module of the battery pack according to the embodiment of the present invention, FIG. 4 is a perspective view showing the battery module of FIG. 3, FIG. 5 is a cross-sectional view taken along a direction a-a’ of FIG. 4, FIG. 6 is an exploded perspective view of the battery pack showing a form in which the battery module of FIG. 4 and a gas flow pipe are coupled to each other, FIG. 7 is a cross-sectional view taken along a direction b-b’ of FIG. 1, FIG. 8 is an exploded perspective view showing a form in which another battery module and the gas flow pipe are coupled to each other according to the embodiment of the present invention, FIG. 9 is a cross-sectional view taken along a direction c-c’ of FIG. 8, FIG. 10 is an exploded perspective view showing a battery module of another battery pack according to the embodiment of the present invention, FIG. 11 is an exploded perspective view showing a first connection mold and a second connection mold of FIG. 10, and FIG. 12 is a cross-sectional view taken along a direction d-d’ of FIG. 10.
A battery pack 1 according to an embodiment of the present invention has a plurality of stacked battery modules 10 received in a battery pack case 2, wherein the battery module 10 is formed to mainly include a first electrode assembly 110, a second electrode assembly 120, a battery case 300, a connection mold 500, and an upper cap 400.
As shown in FIG. 2, the first electrode assembly 110 and the second electrode assembly 120 is formed so that an anode tab 210 is formed to be extended from an anode plate, a cathode tab 220 is formed to be extended from a cathode plate, and an electrode tab 200 including the anode tab 210 and the cathode tab 220 is sealed by a pouch 130 to be exposed to the outside.
In this case, the first electrode assembly 110 and the second electrode assembly 120 are stacked in parallel with each other so that the electrode tabs 200 face each other and the electrode tab 200 of the first electrode assembly 110 and the electrode tab 200 of the second electrode assembly 120 are spaced apart from each other by a predetermined distance without being in contact with each other by thicknesses of the anode plate and the cathode plate 142.
As shown in FIG. 3, the battery case 300 is formed so that an upper side or both sides thereof is opened in a height direction and the first electrode assembly 110 and the second electrode assembly 120 which are stacked are inserted into and received in the battery case 300.
The battery case 300 may be formed by a metal plate having a thin thickness of 0.1mm to 1.0mm and may be formed so as to easily adhere the first electrode assembly 110 and the second electrode assembly 120 received in the case to each other by having a form in which a central portion of both sides in a width direction is inwardly recessed or having a plurality of grooves formed to be inwardly recessed.
In the case in which both sides of the battery case 300 are formed to be opened, the battery module 10 may be formed to further include a lower cap closing a lower side of the battery case 300.
The lower cap may be formed in a form in which an interior thereof is hollowed and an upper side thereof is opened and may be coupled so that the lower side of the battery case 300 is inserted into the hollowed inner region, thereby making it possible to close the lower side of the battery case.
The battery case 300 may be formed to be shorter than the first electrode assembly 110 and the second electrode assembly 120 so that the electrode tab200 may be protruded to an upper side in a state in which the first electrode assembly 110 and the second electrode assembly 120 are received in the battery case 300.
The connection mold 500 is inserted between the electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130, and is formed so that a plurality of terminals 510 formed on one side are connected to the electrode tab 200.
In addition, the connection mold 500 is formed so that the gas generated from the first electrode assembly 110 and the second electrode assembly120 is collected in a gas collection part 560 by including the gas collection part 560 formed to be penetrated in a height direction.
In this case, in a state in which the connection mold 500 is inserted between the electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130, the terminals 510 are electrically connected to the electrode tab 200 by welding.
That is, since the connection mold 500 is inserted between the facing electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130, it presses the electrode tabs 200 in a width direction of the connection mold 500 to be easily welded to the terminals 510, serves to fix the terminals 510 connected to the electrode tabs 200, and discharges the gas generated from the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130 to the outside through the gas collection part 560.
Meanwhile, the battery module 10 applies a hotmelt, an adhesive, or the like to a space between the pouches 130 of the first electrode assembly 110 and the second electrode assembly 120 before the connection mold 500 is inserted thereinto and may then insert and fix the connection mold 500 thereinto.
The upper cap400 is formed so that an interior thereof is hollowed and the lower side thereof is opened, and is coupled to an upper side of the connection mold 500 after the connection mold 500 is inserted and coupled between the first electrode assembly 110 and the second electrode assembly 120.
In this case, the upper cap 400 is coupled to the battery case 300 while enclosing some regions on upper sides of the first electrode assembly 110 and the second electrode assembly 120 from the outside.
In addition, the upper cap 400 has a gas discharging part communicating with the gas collection part 560, formed at a location corresponding to a location at which the gas collection part 560 is formed and includes a cutting part formed by hollowing regions corresponding to locations at which the terminals 510 are formed so that the terminals 510 of the connection mold 500 are exposed to the outside.
The first electrode assembly 110 and the second electrode assembly 120 have a structure that the pouches 130 of a side at which the electrode tab200 is formed may be closely adhered by the connection mold 500 and the battery case 300.
That is, the battery module 10 has a structure that the pouch 130 and the electrode tab 200 are strongly adhered to each other by pressurizing an outerside of a predetermined region of an upper portion of the pouch 130 having the electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 formed thereon in the width direction from both sides by the connection mold 500 and the battery case 300 and the gas generated from an inner portion of the first electrode assembly 110 and the second electrode assembly 120 may be collected only into the gas collection part 560 while not being leaked into the pouch 130 of the side at which the electrode tab 200 is formed.
Likewise, the pouch 130 is pressurized in the width direction also by the upper cap 400 coupled to the outside of the battery case 300 and may be closely adhered to the electrode tab 200.
Particularly, the battery pack 1according to the embodiment of the present invention has a configuration that a plurality of battery modules 10 having characteristics as described above are stacked and are received in the battery pack case 2 and a gas flow pipe is formed to be extended in a length direction of the battery pack 1 so as to be communicated with the gas discharging part formed on the upper cap 400 and the gas collection part 560 of the connection mold 500.
As shown in FIGS. 6 and 7, the battery module 10 has a structure in the connection mold 500 that a gas discharging pipe 570 is protrudedly formed at an upper side of a region in which the gas collection part 560 is formed, and the gas discharging part may be formed to be hollowed at the location corresponding to the gas discharging pipe 570 of the upper cap 400.
In this case, a gas guide pipe 4 may be provided with an insertion hole 5 so that the gas discharging pipe 570 is insertedly coupled to the insertion hole 5.
Therefore, the gas discharging pipe 570 may be inserted into the gas discharging part in a state in which the connection mold 500 and the upper cap 400 are coupled to each other to thereby be protruded toward the upper side, and may be insertedly coupled to the insertion hole 5 of the gas guide pipe 4 to thereby discharge the gas to an inner portion of the gas guide pipe 4.
In addition, as shown in FIGS. 8 and 9, the gas guide pipe 4 may be provided with the gas discharging pipe 570 to be protruded therefrom, such that the gas discharging pipe 570 is insertedly coupled to the gas collection part 560.
Therefore, the battery pack 1 according to the embodiment of the present invention is formed so that the gas generated from the unit battery, that is, the first electrode assembly 110 and the second electrode assembly 120 is discharged to the gas flow pipe through the gas collection part 560, thereby making it possible to improve safety by preventing explosion of the battery and to efficiently improve a riding environment by causing the gas not to affect passengers riding in the vehicle
In other words, the battery pack 1 according to the embodiment of the present invention is formed in a compact structure, thereby making it possible to rapidly discharge the gas generated from the unit battery by a swelling phenomenon to a designated external path, that is, the gas collection part 560.
Meanwhile, as shown in FIG. 10, a battery pack 1 according to an embodiment of the present invention may be formed so that a battery module 10 includes a first electrode assembly 110, a second electrode assembly 120, a battery case 300, a first connection mold 500a, a second connection mold 500b, and an upper cap 400.
The first connection mold 500a is inserted between the electrode tabs 200 of the first electrode assembly 110 and the second electrode assembly 120 and the pouch 130, and includes a gas channel formed to be penetrated in the height direction.
The second connection mold 500b is coupled to the first connection mold 500a at an upper side of the first connection mold 500a, has a plurality of terminals 510 formed on an upper side thereof connected to the electrode tab 200, and includes the gas collection part 560 formed to be communicated with the gas channel.
In this case, the first connection mold 500a may be formed so that a predetermined region of both sides is recessed inwardly in a width direction thereof to thereby form a gas discharging groove 550 and the gas discharging groove 550 is communicated with the gas collection part 560 when being coupled to the second connection mold 500b.
That is, as shown in FIGS. 11 and 12, the gas discharging groove 550 formed at the central portion of both sides in the width direction of the first connection mold 500a is disposed between the anode tab 210 and the cathode tab 220, and serves as a gas flow passage so that the gas may be discharged through the pouch 130 disposed between the anode tab 210 and the cathode tab 220 and may be moved to the gas collection part 560.
Here, the first connection mold 500a has a structure that hollow parts 520 having opened upper surfaces are formed at both sides in a length direction around the gas discharging groove 550 and coupling holes 521 having a predetermined region hollowed are formed at both sides in a width direction of the hollow part 520, and the second connection mold 500b has a structure that hooks 540 inserted into the hollow parts 520 of the first connection mold 500a to be clip-coupled to the coupling holes 521 may be protrudedly formed at both sides of a lower side around the gas collection part 560.
Therefore, the first connection mold 500a is insertedly fixed between the electrode tab 200 of the first electrode assembly 110 and the electrode tab200 of the second electrode assembly 120 and may be then press-fitted with the second connection mold 500b at the upper side thereof.
The battery module 10 as described above is easily fixed between the first electrode assembly 110 and the second electrode assembly 120 as compared to the case in which the connection mold 500 is integrally formed in the battery module 10 shown in FIG. 3. In addition, after the hotmelt, the adhesive, or the like is applied between the first electrode assembly 110 and the second electrode assembly 120, the first connection mold 500a is inserted and fixed therebetween and the second connection mold 500b is coupled to the first connection mold 500a, thereby making it possible to significantly improve assembly performance.
In this case, the second connection mold 500b has a configuration that guides 541 protruded so as to contact with both sides in the length direction of the hollow parts 520 are formed to be protruded at both sides in the length direction in which the hooks 540 are formed, such that when the hook 540 is inserted into the hollow part 520 of the first connection mold 500a, there is no need to separately align the location of the hook 540 so as to be inserted and clip-coupled to the coupling hole 521, thereby making it possible to simply couple the second connection mold 500b to the first connection mold 500a.
The first connection mold 500a has fixed blades 530 formed to be protruded at both sides of the width direction thereof or both sides of the length direction thereof, such that when the first connection mold 500a is inserted between the first electrode assembly 110 and the second electrode assembly 120, it is put on the pouch 130 which is upper side edge portions of the first electrode assembly 110 and the second electrode assembly 120.
Therefore, the first connection mold 500a may easily maintain horizontality with the first electrode assembly 110 and the second electrode assembly 120 and may maintain a constant inserted depth, such that the electrode tab200 may be coupled to the terminals 510 formed on the second connection mold 500b at exact locations.
Meanwhile, the battery module 10 has a structure in the second connection mold 500b that a gas discharging pipe 570 is protrudedly formed at one side in a height direction of a region in which the gas collection part 560 is formed, and the gas discharging part may be formed to be hollowed at the location corresponding to the gas discharging pipe 570 of the upper cap 400.
In this case, a gas guide pipe 4 may be provided with an insertion hole 5 so that the gas discharging pipe 570 is insertedly coupled thereto, such that the gas discharging pipe 570 coupled to the upper cap 400 to be exposed to the upper side of the gas discharging part may be inserted into the insertion hole 5.
In addition, the battery module 10 has a structure that the gas collection part 560 and the gas discharging part of the second connection mold 500b are formed in a hollowed hole state and the gas discharging pipe 570 is formed to be protruded from the gas guide pipe 4 and is coupled to the gas collection part 560.
The order of coupling the battery pack 1 according to the embodiment of the present invention will be described with reference to FIG. 1. First, the plurality of battery modules 10 in the assembled state are stacked on and inserted into the battery pack case 2, the battery module 10 is fixed in the battery pack case 2 by finishing edges of both sides of an upper side of the battery pack case with side cases 3, the gas discharging pipe 570 protruded upwardly of each battery module 10 is insertedly fixed to the insertion hole 5 formed at the gas guide pipe 4.
The gas guide pipe 4 may be welded to be fixed to the gas discharging pipe 570, as needed.
The present invention is not limited to the above-mentioned exemplary embodiments but may be variously applied, and may be variously modified by those skilled in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims.

Claims (8)

  1. A battery pack, comprising:
    a plurality of stacked battery modules received in a battery pack case, including:
    a first electrode assembly and a second electrode assembly having electrode tabs including an anode tab and a cathode tab formed to be extended from an anode plate and a cathode plate and sealed by a pouch so that the electrode tab is exposed to the outside;
    a battery case having one side opened in a height direction so that the first electrode assembly and the second electrode assembly are received therein;
    a connection mold inserted between the electrode tabs of the first electrode assembly and the second electrode assembly and the pouch to thereby connect a plurality of terminals formed on one side to the electrode tabs, and including a gas collection part formed so as to be penetrated in a height direction; and
    an upper cap coupled to the connection mold at the opened side of the battery case and having a gas discharging part formed therein communicating with the gas collection part; and
    a gas guide pipe formed to be extended in a length direction so as to be communicated with the gas discharging part of the battery module.
  2. The battery pack of claim 1, wherein the battery module has a structure in the connection mold that a gas discharging pipe is protrudedly formed at one side in a height direction of a region in which the gas collection part is formed, and the gas discharging part is formed to be hollowed at a location corresponding to the gas discharging pipe of the upper cap.
  3. The battery pack of claim 2, wherein the gas guide pipe has an insertion hole formed therein so that the gas discharging pipe is insertedly coupled to the insertion hole.
  4. The battery pack of claim 1, wherein the gas guide pipe has a gas discharging pipe protrudedly formed therefrom so as to be insertedly coupled to the gas collection part.
  5. A battery pack, comprising:
    a plurality of stacked battery modules received in a battery pack case, including:
    a first electrode assembly and a second electrode assembly having electrode tabs including an anode tab and a cathode tab formed to be extended from an anode plate and an anode plate and sealed by a pouch so that the electrode tab is exposed to the outside;
    a battery case having one side opened in a height direction so that the first electrode assembly and the second electrode assembly are received therein;
    a first connection mold inserted between the electrode tabs of the first electrode assembly and the second electrode assembly and the pouch and including a gas channel formed so as to be penetrated in a height direction;
    a second connection mold coupled to the first connection mold at one side positioned in a direction opposite to the direction in which the first connection mold is inserted between the electrode tabs, having a plurality of terminals formed on one side so as to be connected to the electrode tabs, and including a gas collection part formed so as to be communicated with the gas channel; and
    an upper cap coupled to the second connection mold at the opened side of the battery case and having a gas discharging part formed therein communicating with the gas collection part; and
    a gas guide pipe formed to be extended in a length direction so as to be communicated with the gas discharging part of the battery module.
  6. The battery pack of claim 5, wherein the battery module has a structure in the second connection mold that a gas discharging pipe is protrudedly formed at one side in a height direction of a region in which the gas collection part is formed, and the gas discharging part is formed to be hollowed at a location corresponding to the gas discharging pipe of the upper cap.
  7. The battery pack of claim 6, wherein the gas guide pipe has an insertion hole formed therein so that the gas discharging pipe is insertedly coupled to the insertion hole.
  8. The battery pack of claim 5, wherein the gas guide pipe has a gas discharging pipe protrudedly formed therefrom so as to be insertedly coupled to the gas collection part.
PCT/KR2013/005738 2012-06-28 2013-06-28 Battery pack WO2014003474A1 (en)

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