WO2021230536A1 - 이차전지 - Google Patents
이차전지 Download PDFInfo
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- WO2021230536A1 WO2021230536A1 PCT/KR2021/005323 KR2021005323W WO2021230536A1 WO 2021230536 A1 WO2021230536 A1 WO 2021230536A1 KR 2021005323 W KR2021005323 W KR 2021005323W WO 2021230536 A1 WO2021230536 A1 WO 2021230536A1
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- gas
- collection space
- secondary battery
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- discharge unit
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- FESRYVBBESMTNR-UHFFFAOYSA-N NCCCC1CC1 Chemical compound NCCCC1CC1 FESRYVBBESMTNR-UHFFFAOYSA-N 0.000 description 1
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/394—Gas-pervious parts or elements
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/317—Re-sealable arrangements
- H01M50/325—Re-sealable arrangements comprising deformable valve members, e.g. elastic or flexible valve members
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/004—CO or CO2
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—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
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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
- H01M50/30—Arrangements for facilitating escape of gases
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/317—Re-sealable arrangements
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/383—Flame arresting or ignition-preventing means
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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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/392—Arrangements for facilitating escape of gases with means for neutralising or absorbing electrolyte; with means for preventing leakage of electrolyte through vent holes
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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
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a secondary battery.
- Secondary batteries unlike primary batteries, are rechargeable, and have been widely researched and developed in recent years due to their small size and large capacity. As technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing.
- the secondary battery is classified into a coin-type battery, a cylindrical battery, a prismatic battery, and a pouch-type battery according to the shape of the battery case.
- the secondary battery accommodates an electrode assembly and an electrolyte.
- an electrode assembly mounted inside a battery case is a charging/discharging power generating element having a stacked structure of electrodes and a separator.
- the electrode assembly is a sheet-type sheet-type electrode assembly coated with an active material, with a separator interposed between the positive electrode and the negative electrode, and is a jelly-roll type, and a stack type in which a plurality of positive and negative electrodes are sequentially stacked with a separator interposed therebetween. , and stacked unit cells can be roughly classified into a stack/folding type in which a long-length separation film is wound.
- a conventional pouch-type battery is configured in a form in which an electrode assembly is accommodated in a pouch.
- the pouch when charging and discharging, the pouch swells and contracts repeatedly due to gas generation. At this time, if the generated gas is left in the pouch, it causes a decrease in battery performance and a change in volume, which has a problem in that it adversely affects the surrounding cells and structures.
- the generated gas exceeds the accommodating limit of the pouch, the gas bursts into a structurally weak part and a leaky vent phenomenon occurs.
- Patent Document 1 Korean Patent Laid-Open No. 10-2014-0015647
- One aspect of the present invention is to provide a secondary battery having a gas pocket part to collect internal gas and to discharge the collected gas.
- a secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked, and a battery case in which the electrode assembly is accommodated, wherein the battery case includes a first gas in which the internal gas of the battery case is collected.
- a collection space is formed, and a first gas pocket part provided with a first exhaust part for discharging gas located in the first collection space is provided, and a second collection part for collecting gas discharged from the first exhaust part of the first gas pocket part.
- a space may be formed and a second gas pocket portion having a second discharge portion through which the gas located in the second collection space is discharged to the outside may be included.
- the battery pack according to the embodiment of the present invention may be a battery pack including the secondary battery according to the embodiment of the present invention.
- the present invention it is possible to stably secure a large amount of space in which the internal gas is collected by providing a double gas pocket in which the internal gas is collected, and the external air and the internal air of the battery may not be directly connected.
- the gas contained in the gas pocket portion can be easily discharged, thereby preventing gas from bursting into a structurally weak portion of the battery case. This prevents leakage of electrolyte, thereby prolonging the life of the battery.
- FIG. 1 is a cross-sectional view showing a secondary battery according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a secondary battery according to an embodiment of the present invention.
- FIG 3 is a plan view illustrating first and second discharge units of a secondary battery according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional view illustrating a closed state at first and second discharge units of a secondary battery according to an embodiment of the present invention.
- FIG. 5 is a cross-sectional view illustrating an open state at first and second discharge units of a secondary battery according to an embodiment of the present invention.
- FIG. 6 is a cross-sectional view showing a secondary battery according to another embodiment of the present invention.
- FIG. 7 is a plan view illustrating first and second discharge units of a secondary battery according to another embodiment of the present invention.
- FIG. 8 is a cross-sectional view illustrating a closed state at first and second discharge units of a secondary battery according to another embodiment of the present invention.
- FIG. 9 is a cross-sectional view illustrating an open state at first and second discharge units of a secondary battery according to another embodiment of the present invention.
- FIG. 1 is a cross-sectional view illustrating a secondary battery according to an embodiment of the present invention
- FIG. 2 is a cross-sectional view showing a secondary battery according to an embodiment of the present invention.
- the secondary battery S1 includes an electrode assembly 200 and a battery case 100 in which the electrode assembly 200 is accommodated, and the battery case 100 ) is the first gas pocket unit 120 and the second collection space 131 provided with the first discharge unit 122 through which the first collection space 121 is formed and the gas is discharged, and the gas is discharged.
- It includes a second gas pocket unit 130 having a discharge unit 132 .
- the secondary battery S1 may further include a gas sensor 150 for measuring whether gas is generated or a gas component, and air pressure sensors 160 and 170 for measuring air pressure.
- the electrode assembly 200 is a power generating element capable of charging and discharging, and electrodes and separators may be alternately stacked.
- the electrode tab 250 and the electrode lead 300 provided at the end of the electrode assembly 200 may be connected to connect the electrode assembly 200 to an external device.
- the electrode 230 may include an anode 210 and a cathode 220 .
- the electrode assembly 200 may have a structure in which the positive electrode 210 / the separator 240 / the negative electrode 220 are alternately stacked.
- the electrode lead 300 may include a positive electrode lead connected to the positive electrode tab provided at the end of the positive electrode 210 and a negative electrode lead connected to the negative electrode tab provided at the end of the negative electrode 220 .
- the positive electrode 210 may include a positive electrode current collector and a positive electrode active material stacked on the positive electrode current collector.
- the positive electrode current collector may be made of an aluminum foil.
- the positive active material may be formed of lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or a compound or mixture containing at least one of them.
- the negative electrode 220 may include a negative electrode current collector and an anode active material laminated on the negative electrode current collector.
- the negative electrode current collector may be made of, for example, a foil made of a copper (Cu) material.
- the negative active material may be a compound or mixture including a graphite-based material.
- the separator 240 is made of an insulating material to electrically insulate between the anode 210 and the cathode 220 .
- the separator 240 may be formed of a polyolefin-based resin film such as polyethylene or polypropylene having microporosity.
- the battery case 100 may accommodate the electrode assembly 200 .
- a first collecting space 121 is formed, a first gas pocket unit 120 having a first discharge unit 122 and a second collecting space 131 are formed, and a second discharge unit ( and a second gas pocket unit 130 provided with 132 .
- the battery case 100 may further include a body 110 in which the receiving part 111 in which the electrode assembly 200 is accommodated is formed.
- the first gas pocket unit 120 has a first collection space 121 in which the internal gas of the battery case 100 is collected, and a first discharge unit in which the gas located in the first collection space 121 is discharged ( 122) may be provided.
- first gas pocket part 120 may extend to the side of the body 110 so that the receiving part 111 and the first collecting space 121 are connected to each other.
- first gas pocket part 120 may be located at an end side of the body 110 in which the electrode lead 300 is located.
- the first gas pocket part 120 may be respectively located on both end sides of the body 110 .
- the first discharge part 122 is located on the first through-hole 123 passing between the first collection space 121 and the second collection space 131 to control the opening and closing of the first through-hole 123 . can do.
- the second gas pocket unit 130 has a second collection space 131 in which the gas discharged from the first discharge unit 122 of the first gas pocket unit 120 is collected, and the second collection space 131 is formed.
- a second discharge unit 132 through which the gas located in the gas is discharged to the outside may be provided.
- the second gas pocket part 130 may be provided above the first gas pocket part 120 so that the second collection space 131 and the first collection space 121 are connected to the first through hole 123 therebetween. have.
- the second discharge part 132 is located on the second through-hole 133 passing between the second collection space 131 and the outside of the battery case 100 to control the opening and closing of the second through-hole 133 . can do.
- first through hole 123 and the second through hole 133 may be provided at positions that do not face each other with respect to the direction in which the gas is discharged.
- first through-hole 123 and the second through-hole 133 may be located at positions that do not face each other in the vertical direction.
- FIG. 3 is a plan view illustrating first and second discharge units of a secondary battery according to an embodiment of the present invention
- FIG. 4 is a closed state at the first and second discharge units of the secondary battery according to an embodiment of the present invention. It is a cross-sectional view
- FIG. 5 is a cross-sectional view showing an open state in the first and second discharge units of the secondary battery according to an embodiment of the present invention.
- the first discharge part 122 and the second discharge part 132 are formed with a first cut-out 122c and a second cut-out 132c, and are formed of an elastic material. , when the pressure is greater than or equal to a predetermined pressure, the first cut-out 122c and the second cut-out 132c may be opened to open the first through-hole 123 and the second through-hole 133 .
- the elastic material may be formed of at least one of silicone, spantex, fluoroelastomer, ethylene, propylene rubber (EPR), styrene, butadiene rubber (SBR), and butyl rubber (PIB).
- the opening pressures of the first discharge unit 122 and the second discharge unit 132 may be different from each other.
- the first discharge part 122 and the second discharge part 132 are formed of a material having a different degree of elasticity from each other, so that the opening pressure of the first discharge part 122 and the second discharge part 132 is different from each other. It may be provided so that there is Accordingly, it is possible to prevent the first discharge unit 122 and the second discharge unit 132 from being opened at the same time, thereby preventing direct contact between the air outside the battery and the air inside the battery.
- the opening pressure of the first discharge unit 122 may be greater than the opening pressure of the second discharge unit 132 . Accordingly, the gas may be easily discharged to the second discharge unit 132 through the first discharge unit 122 .
- the first cutout 122c and the second cutout 132c may be formed of 2 to 4 cutout lines 122a, 122b, 132a, and 132b.
- the first cut-out 122c and the second cut-out 132c may be formed as cross-shaped (“+”) cut-out lines 122a, 122b, 132a, and 132b.
- the first cut-out 122c and the second cut-out 132c have a first through-hole 123 and The second through hole 133 may be closed.
- the first cut-out 122c and the second cut-out 132c are connected to the cut-out lines 122a, 122b, and 132a. , 132b), the first through-hole 123 and the second through-hole 133 may be opened.
- the gas sensor 150 may be provided inside the second gas pocket unit 130 to measure whether gas is generated or a gas component in the second collection space 131 .
- a specific gas of the second gas pocket unit 130 may be detected through the gas sensor 150 , so that an alarm for a specific purpose may be possible.
- the gas sensor 150 may detect the generation of carbon dioxide (CO 2 ).
- the gas sensor 150 may generate at least one of a notification signal, a notification sound, and a notification light when gas is generated.
- the gas sensor 150 may generate at least one of a notification signal, a notification sound, and a notification light.
- the gas sensor 150 may include a notification speaker and a notification LED to generate a notification sound and a notification light.
- the gas sensor 150 may be connected to a monitoring device to transmit a generated notification signal.
- the air pressure sensors 160 and 170 may be provided inside at least one of the first gas pocket part 120 and the second gas pocket part 130 to measure the air pressure.
- the air pressure sensors 160 and 170 may be located in the first gas pocket part 120 and the second gas pocket part 130 to measure the air pressure of the first collection space 121 and the second collection space 131 . .
- the air pressure sensors 160 and 170 may generate, for example, at least one of a notification sound or a notification light when the measured air pressure measurement value is greater than or equal to a predetermined pressure.
- the air pressure sensors 160 and 170 may transmit the measured air pressure measurement value to the monitoring device as another example.
- the monitoring device may be, for example, a battery management system (BMS).
- BMS battery management system
- the secondary battery S1 according to an embodiment of the present invention configured as described above includes a first gas pocket part 120 and a second gas pocket part 130 for collecting and discharging gas, and the internal gas is collected. A large amount of space can be stably secured, and the internal gas can be discharged so that the air outside the battery and the air inside the battery are not directly connected.
- first discharge unit 122 and a second discharge unit 132 are formed in the first gas pocket unit 120 and the second gas pocket unit 130 to discharge gas when the pressure is higher than a predetermined pressure, respectively,
- the gas accommodated in the first gas pocket part 120 and the second gas pocket part 130 may be easily discharged, thereby extending the life of the battery.
- the gas sensor 150 By positioning the gas sensor 150 inside the second gas pocket unit 130 , it is possible to measure whether gas is generated or a gas component in the second collection space 131 .
- FIG. 6 is a cross-sectional view showing a secondary battery according to another embodiment of the present invention
- FIG. 7 is a plan view showing first and second discharge units of the secondary battery according to another embodiment of the present invention
- FIG. 8 is another embodiment of the present invention.
- 9 is a cross-sectional view showing a closed state at the first and second discharge units of the secondary battery according to the example
- FIG. 9 is a cross-sectional view showing the opened state at the first and second discharge units of the secondary battery according to another embodiment of the present invention.
- the secondary battery S2 according to another embodiment of the present invention includes an electrode assembly 200 and a battery case 100 accommodating the electrode assembly 200 , and the battery case 100 .
- ) is the first gas pocket unit 120 and the second collection space 131 provided with the first discharge unit 1122 through which the first collection space 121 is formed and the gas is discharged, and the gas is discharged.
- It includes a second gas pocket unit 130 having a discharge unit 132 .
- the secondary battery S2 may further include a gas sensor 150 for measuring whether gas is generated or a gas component, and air pressure sensors 160 and 170 for measuring air pressure.
- the secondary battery S2 has cut-out lines 1122a, 1122b, and 1132a of the first and second discharge parts 1122 and 1132 when compared to the secondary battery according to the embodiment of the present invention described above. , 1132b) there is a difference in that the adhesive liquids 1122d and 1132d are further positioned. Accordingly, in another embodiment of the present secondary battery S2 , the content overlapping with the embodiment of the above-described secondary battery will be omitted or briefly described, and the differences will be mainly described.
- the battery case 100 may accommodate the electrode assembly 200 .
- a first collecting space 121 is formed, a first gas pocket unit 120 having a first discharge unit 1122 and a second collecting space 131 are formed, and a second discharge unit ( and a second gas pocket unit 130 provided with 132 .
- the battery case 100 may further include a body 110 in which the receiving part 111 in which the electrode assembly 200 is accommodated is formed.
- the first gas pocket unit 120 has a first collection space 121 in which the internal gas of the battery case 100 is collected, and a first discharge unit in which the gas located in the first collection space 121 is discharged ( 1122) may be provided.
- the first gas pocket part 120 may extend to the side of the body 110 so that the receiving part 111 and the first collecting space 121 are connected to each other.
- a second collection space 131 in which gas discharged from the first discharge unit 1122 of the first gas pocket unit 120 is collected is formed, and the second collection space 131 is formed.
- a second discharge unit 132 through which the gas located in the gas is discharged to the outside may be provided.
- the second gas pocket part 130 may be provided above the first gas pocket part 120 so that the second collection space 131 and the first collection space 121 are connected to each other through the first through hole.
- the first discharge part 1122 may be positioned on the first through hole passing between the first collecting space 121 and the second collecting space 131 to control opening and closing of the first through hole.
- the second discharge part 132 may be positioned on a second through hole passing between the second collection space 131 and the outside of the battery case 100 to control opening and closing of the second through hole.
- the first discharge part 1122 and the second discharge part 132 have a first cutout 1122c and a second cutout 1132c, are formed of an elastic material, and are formed of a first cutout when the pressure is greater than or equal to a predetermined pressure.
- the 1122c and the second cutout 1132c may be opened to open the first through-hole and the second through-hole.
- the first cutout 1122c and the second cutout 1132c may be formed by 2 to 4 cutout lines 1122a, 1122b, 1132a, and 1132b.
- the first cut-out 1122c and the second cut-out 1132c may be formed as cut-out lines 1122a, 1122b, 1132a, and 1132b in a cross (“+”) shape.
- the opening pressures of the first discharge unit 1122 and the second discharge unit 132 may be different from each other.
- the first discharge unit 1122 and the second discharge unit 132 are formed of a material having a different elasticity from each other, and the opening pressure of the first discharge unit 1122 and the second discharge unit 132 is different from each other. It may be provided so that there is In this case, the opening pressure of the first discharge unit 1122 may be greater than the opening pressure of the second discharge unit 132 .
- the first discharge part 1122 and the second discharge part 132 further include adhesive solutions 1122d and 1132d positioned on the first cutout 1122c and the second cutout 1132c, The portion 1122c and the second cutout 1132c are additionally sealed, and the first cutout 1122c and the second cutout 1132c are opened when the first cutout 1122c and the second cutout 1132c are opened by gas pressure. The adhesive force sealing the cutout 1132c may be released.
- first cutout 1122c and the second cutout 1132c are more tightly sealed through the adhesive liquids 1122d and 1132d, and the first cutout 1122c and the second cutout 1122c of the first discharge part 1122 are sealed. It is possible to more effectively prevent gas and electrolyte from leaking under a predetermined pressure or less between the second cutouts 1132c of the second discharge part 132 .
- a plurality of secondary batteries having the above configuration may be electrically connected to configure a battery pack.
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- Combustion & Propulsion (AREA)
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- Gas Exhaust Devices For Batteries (AREA)
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- Sealing Battery Cases Or Jackets (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
Description
Claims (15)
- 전극 및 분리막이 교대로 적층된 전극 조립체; 및상기 전극 조립체가 수용되는 전지 케이스를 포함하고,상기 전지 케이스는,상기 전지 케이스의 내부 가스가 포집되는 제1 포집 공간이 형성되고, 상기 제1 포집 공간에 위치된 가스가 배출되는 제1 배출부가 구비된 제1 가스 포켓부; 및상기 제1 가스 포켓부의 제1 배출부에서 배출되는 가스가 포집되는 제2 포집 공간이 형성되고, 상기 제2 포집 공간에 위치된 가스가 외부로 배출되는 제2 배출부가 구비된 제2 가스 포켓부를 포함하는 이차전지.
- 청구항 1에 있어서,상기 제1 배출부는 상기 제1 포집 공간과 상기 제2 포집 공간 사이를 관통하는 제1 관통홀 상에 위치되어, 상기 제1 관통홀의 개폐를 단속하고,상기 제2 배출부는 상기 제2 포집 공간과 상기 전지 케이스의 외부 사이를 관통하는 제2 관통홀 상에 위치되어, 상기 제2 관통홀의 개폐를 단속하는 이차전지.
- 청구항 2에 있어서,상기 전지 케이스는 상기 전극 조립체가 수용되는 수용부가 형성된 몸체를 포함하고,상기 제1 가스 포켓부는 상기 수용부와 상기 제1 포집 공간이 연결되도록 상기 몸체의 측면으로 연장되고,상기 제2 가스 포켓부는 상기 제2 포집 공간과 상기 제1 포집 공간이 상기 제1 관통홀을 사이로 연결되도록 상기 제1 가스 포켓부의 상부에 구비되는 이차전지.
- 청구항 2에 있어서,상기 제1 배출부는 및 상기 제2 배출부는 제1 절개부 및 제2 절개부가 형성되고, 탄성재질로 형성되어, 소정 압력 이상일 때 상기 제1 절개부 및 상기 제2 절개부가 벌어지며 상기 제1 관통홀 및 상기 제2 관통홀을 개방시키는 이차전지.
- 청구항 4에 있어서,상기 제1 절개부 및 상기 제2 절개부는 2~4개의 절개 라인으로 형성되는 이차전지.
- 청구항 4에 있어서,상기 제1 절개부 및 상기 제2 절개부 는 열십자("+") 형태의 절개 라인으로 형성되는 이차전지.
- 청구항 4에 있어서,상기 제1 배출부 및 상기 제2 배출부는 상기 제1 절개부 및 상기 제2 절개부 상에 위치되는 점착액을 더 포함하여, 상기 제1 절개부 및 상기 제2 절개부를 추가적으로 밀봉하고, 상기 제1 절개부 및 상기 제2 절개부가 가스 압력에 의해 벌어질 때 상기 제1 절개부 및 상기 제2 절개부를 밀봉하는 점착력이 해제되는 이차전지.
- 청구항 2에 있어서,상기 제1 배출부 및 상기 제2 배출부의 개방압력은 상호 차이가 있도록 구비되는 이차전지.
- 청구항 2에 있어서,상기 제1 배출부 및 상기 제2 배출부는 서로 탄성도가 차이나는 재질로 형성되어, 상기 제1 배출부 및 상기 제2 배출부의 개방압력은 상호 차이가 있도록 구비되는 이차전지.
- 청구항 8에 있어서,상기 제1 배출부의 개방압력은 상기 제2 배출부의 개방압력 보다 크게 구비되는 이차전지.
- 청구항 1에 있어서,상기 제2 가스 포켓부의 내부에 구비되어 상기 제2 포집 공간에서의 가스 발생 여부 또는 가스 성분을 측정하는 가스센서를 더 포함하는 이차전지.
- 청구항 11에 있어서,상기 가스센서는 이산화탄소(CO2)의 발생을 감지하는 이차전지.
- 청구항 11에 있어서,상기 가스센서는 가스 발생 시 알림 신호, 알림음, 또는 알림광 중 적어도 어느 하나 이상을 발생시키는 이차전지.
- 청구항 1에 있어서,상기 제1 가스 포켓부 또는 상기 제2 가스 포켓부 중에서 적어도 어느 하나 이상의 내부에 구비되어 공기압을 측정하는 공기압 센서를 더 포함하는 이차전지.
- 청구항 1 내지 청구항 14 중 어느 한 항에 기재된 이차전지를 포함하는 전지팩.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
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| CN202180029026.7A CN115428247B (zh) | 2020-05-13 | 2021-04-27 | 二次电池 |
| EP25221561.1A EP4707795A2 (en) | 2020-05-13 | 2021-04-27 | Secondary battery |
| CN202311783401.4A CN117937036A (zh) | 2020-05-13 | 2021-04-27 | 二次电池 |
| EP21803818.0A EP4131613B1 (en) | 2020-05-13 | 2021-04-27 | Secondary battery |
| JP2022541680A JP7463524B2 (ja) | 2020-05-13 | 2021-04-27 | 二次電池 |
| US17/921,466 US20230178843A1 (en) | 2020-05-13 | 2021-04-27 | Secondary Battery |
| ES21803818T ES3063943T3 (en) | 2020-05-13 | 2021-04-27 | Secondary battery |
| JP2024049704A JP7715866B2 (ja) | 2020-05-13 | 2024-03-26 | 二次電池 |
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| KR1020200057375A KR102807656B1 (ko) | 2020-05-13 | 2020-05-13 | 이차전지 |
| KR10-2020-0057375 | 2020-05-13 |
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| US (1) | US20230178843A1 (ko) |
| EP (2) | EP4707795A2 (ko) |
| JP (2) | JP7463524B2 (ko) |
| KR (1) | KR102807656B1 (ko) |
| CN (2) | CN115428247B (ko) |
| ES (1) | ES3063943T3 (ko) |
| WO (1) | WO2021230536A1 (ko) |
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| EP4490507A1 (en) * | 2022-03-10 | 2025-01-15 | Lyten, Inc. | Battery safety system for detecting analytes |
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| KR20240108650A (ko) * | 2023-01-02 | 2024-07-09 | 주식회사 엘지에너지솔루션 | 파우치형 이차전지 |
| CN116914364A (zh) * | 2023-08-31 | 2023-10-20 | 吉林大学 | 电池安全阀、电池和电池模组以及产气方法 |
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| EP4632915A4 (en) * | 2022-12-23 | 2026-04-22 | Lg Energy Solution Ltd | RECHARGEABLE BATTERY |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2024071572A (ja) | 2024-05-24 |
| JP7715866B2 (ja) | 2025-07-30 |
| CN117937036A (zh) | 2024-04-26 |
| JP7463524B2 (ja) | 2024-04-08 |
| ES3063943T3 (en) | 2026-04-21 |
| KR102807656B1 (ko) | 2025-05-14 |
| EP4131613A4 (en) | 2024-09-04 |
| CN115428247A (zh) | 2022-12-02 |
| CN115428247B (zh) | 2024-01-09 |
| EP4131613B1 (en) | 2026-01-21 |
| US20230178843A1 (en) | 2023-06-08 |
| JP2023509497A (ja) | 2023-03-08 |
| EP4707795A2 (en) | 2026-03-11 |
| EP4131613A1 (en) | 2023-02-08 |
| KR20210139082A (ko) | 2021-11-22 |
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