WO2022010256A1 - 가스 배출을 위한 가스 배출부를 포함하는 이차전지 및 이차전지 제조방법 - Google Patents
가스 배출을 위한 가스 배출부를 포함하는 이차전지 및 이차전지 제조방법 Download PDFInfo
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- WO2022010256A1 WO2022010256A1 PCT/KR2021/008647 KR2021008647W WO2022010256A1 WO 2022010256 A1 WO2022010256 A1 WO 2022010256A1 KR 2021008647 W KR2021008647 W KR 2021008647W WO 2022010256 A1 WO2022010256 A1 WO 2022010256A1
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- WO
- WIPO (PCT)
- Prior art keywords
- gas
- secondary battery
- pouch
- gas discharge
- electrode assembly
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007599 discharging Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 40
- -1 polypropylene Polymers 0.000 claims description 52
- 239000000463 material Substances 0.000 claims description 43
- 239000004743 Polypropylene Substances 0.000 claims description 28
- 229920001155 polypropylene Polymers 0.000 claims description 28
- 230000035699 permeability Effects 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000004698 Polyethylene Substances 0.000 claims description 15
- 229920000573 polyethylene Polymers 0.000 claims description 15
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 15
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 15
- 230000035515 penetration Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 5
- 238000010943 off-gassing Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 104
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000011358 absorbing material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000007500 overflow downdraw method Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007764 slot die coating Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
Images
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
- H01M50/10—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
-
- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
- H01M50/141—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against humidity
-
- 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a secondary battery including a gas exhaust filter and a method for manufacturing a secondary battery, and more particularly, includes a case having a gas exhaust part capable of selectively exhausting internal gas while blocking moisture inflow into the secondary battery It relates to a secondary battery and a secondary battery manufacturing method.
- a pouch-type secondary battery is generally formed by forming an aluminum laminate sheet to form an accommodating part, and then accommodating an electrode assembly including a positive electrode, a separator, and a negative electrode in the accommodating part.
- the aluminum laminate sheet is easily deformable and can be manufactured in various shapes to form a pouch-type secondary battery suitable for various electronic devices.
- the aluminum laminate sheet is lightweight unlike the conventional cylindrical secondary battery or prismatic secondary battery, there is an advantage in that the energy density per weight of the pouch-type secondary battery can be improved.
- FIG. 1 is a perspective view of a pouch-type secondary battery according to the prior art.
- a pouch-type secondary battery according to the prior art includes an electrode assembly 10 from which an electrode lead 11 protrudes, and a case 20 having an accommodating part 21 for accommodating the electrode assembly 10 .
- the periphery of the accommodating part 21 is sealed to form a sealing part 22 .
- the sealing part 22 is formed so that materials existing inside the pouch-type secondary battery do not react with external air, a separate member for removing gas generated inside the storage part does not exist.
- a gas removing material is placed therein to remove gas, or a gas storage part is provided separately in addition to the storage part.
- a substance that removes gas is placed, the efficiency of the battery is reduced by interfering with the operation of the pouch-type secondary battery. There is a problem with this decreasing.
- Patent Document 1 a hydrogen permeable material is formed on at least a part of the metal tab leads exposed to the outside of the exterior material, and the hydrogen permeable material is continuously present from the inside to the outside of the exterior material.
- the hydrogen permeable material is used to prevent moisture from penetrating into the battery, which may interfere with the operation of the battery, and has a disadvantage in that gas other than hydrogen cannot be efficiently discharged.
- the electrode lead is formed in a porous structure, and a gas absorbing material is coated on the inner surface of the pores of the electrode lead, but there is a fear that the gas absorbing material acts as a resistance to reduce the efficiency of the entire battery.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2014-212034
- Patent Document 2 Republic of Korea Patent Publication No. 2017-0082239
- a gas discharge unit for selectively discharging only gas is placed in the sealing part of the pouch-type secondary battery to efficiently discharge gas without infiltration of moisture from the outside to maintain battery performance while improving safety.
- an object of the present invention is to provide a method for manufacturing a secondary battery having a low battery defect rate while facilitating gas discharge because the case is well sealed by providing a method of sealing the gas discharge unit, the case, and the electrode lead together.
- a secondary battery according to the present invention for solving the above problems includes a housing unit for accommodating an electrode assembly, a sealing unit formed by sealing the periphery of the receiving unit, and one end of the sealing unit is in contact with the receiving unit and the other end is outside. It may include a pouch-type case having a gas discharge unit that selectively discharges only gas by contact.
- the gas discharging unit may be made of a gas discharging material having a gas permeability greater than a water permeability.
- the outgassing material may have a moisture penetration rate of 50 ppm or less for one year.
- the outgassing material may be polypropylene (PP), polytetrafluoroethylene (PTFE), polyethylene (PE), polyethylene tetraphthalate (PET), or a mixture thereof.
- PP polypropylene
- PTFE polytetrafluoroethylene
- PE polyethylene
- PET polyethylene tetraphthalate
- the thickness of the gas discharge part may be 100 ⁇ m or more and 600 ⁇ m or less.
- the gas discharge part may surround the electrode lead protruding to the outside from the electrode assembly.
- the pouch-type case may include a laminate sheet, and the gas discharge part and the laminate sheet contact part may be coated with polypropylene.
- the secondary battery according to the present invention comprises the pouch-type case and the electrode assembly.
- the present invention comprises the steps of (S1) applying a gas-discharging material having a gas permeability greater than a water permeability to at least a portion of the electrode lead surface of the electrode assembly; and (S2) accommodating the electrode assembly in a receiving unit inside a pouch-type case provided with a gas discharge unit and sealing the electrode assembly.
- the gas-discharge material may include polypropylene (PP), polytetrafluoroethylene (PTFE), polyethylene (PE), polyethylene tetraphthalate (PET), or a mixture thereof.
- PP polypropylene
- PTFE polytetrafluoroethylene
- PE polyethylene
- PET polyethylene tetraphthalate
- the gas-discharge material and the pouch-type case may be combined by thermal fusion at least once to 10 times.
- the gas discharge unit may undergo a surface modification process.
- the thickness of the gas discharge part may be 100 ⁇ m or more and 600 ⁇ m or less.
- one or two or more non-conflicting configurations among the above configurations may be selected and combined.
- the secondary battery according to the present invention includes a gas discharge unit that selectively discharges only gas, thereby efficiently discharging internal gas, thereby improving safety while maintaining performance of the secondary battery.
- the secondary battery since the secondary battery has a small amount of permeation of moisture inside the battery, and safety is maintained even when a large amount of electrode assembly is accommodated therein compared to a conventional battery, the performance and lifespan characteristics of the battery are improved.
- sealing force is also improved, thereby reducing the battery defect rate and reducing the cost of manufacturing the secondary battery.
- FIG. 1 is a perspective view of a pouch-type secondary battery according to the prior art.
- FIG. 2 is a perspective view of a pouch-type secondary battery according to the present invention.
- FIG 3 is a cross-sectional view according to the first embodiment of the pouch-type secondary battery according to the present invention.
- FIG. 4 is a cross-sectional view according to the second embodiment of the pouch-type secondary battery according to the present invention.
- 5 is a graph comparing the moisture permeability when the polypropylene is used in the gas outlet according to the present invention and when the gas outlet is not provided.
- FIG. 6 is a graph comparing the gas permeability when polypropylene is used in the gas outlet according to the present invention and when the gas outlet is not provided.
- FIG. 2 is a perspective view of a pouch-type secondary battery according to the present invention.
- the pouch-type secondary battery according to the present invention includes an electrode assembly 100 from which an electrode lead 110 protrudes, a housing 210 accommodating the electrode assembly 100, and a periphery of the accommodating part 210 .
- a case ( 200) is included.
- the electrode assembly 100 is a jelly-roll-type assembly having a structure in which a separator is interposed between a long sheet-shaped positive electrode and a negative electrode and then wound up, or a unit of a structure in which a rectangular positive electrode and a negative electrode are stacked with a separator interposed therebetween.
- a stacked assembly consisting of cells, a stack-folding assembly in which unit cells are wound by a long separation film, or a lamination-stacking assembly in which unit cells are stacked with a separator interposed therebetween and attached to each other, etc. can be done, but is not limited thereto.
- the electrode assembly according to the present invention preferably has a stack-folding type, lamination-stack type structure in which physical stress is minimal when forming a curved module.
- the electrode lead 110 may have a structure in which the positive electrode tab and the negative electrode tab of the electrode assembly 100 are electrically connected to each other and then exposed to the outside of the case, and the electrode lead 110 is directly connected without the positive electrode tab and the negative electrode tab. It may have a structure connecting the outside of the electrode assembly 100 and the case 200, but is not limited thereto. Since the secondary battery as described above corresponds to generally known configurations, a more detailed description thereof will be omitted.
- the case 200 typically has a laminate sheet structure of an inner layer/metal layer/outer layer. Since the inner layer is in direct contact with the electrode assembly, it must have insulation and electrolyte resistance, and for sealing with the outside, the sealing property, that is, the sealing portion where the inner layers are thermally bonded to each other must have excellent thermal bonding strength.
- the material of the inner layer may be selected from polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, polybutylene, etc., polyurethane resins and polyimide resins having excellent chemical resistance and good sealing properties, but is not limited thereto, Polypropylene excellent in mechanical properties such as tensile strength, rigidity, surface hardness, and impact resistance and chemical resistance is the most preferable.
- the metal layer in contact with the inner layer corresponds to a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside.
- an outer layer is provided on the other side of the metal layer, and this outer layer can be made of a heat-resistant polymer with excellent tensile strength, moisture permeability and air permeability prevention so as to secure heat resistance and chemical resistance while protecting the electrode assembly.
- a heat-resistant polymer with excellent tensile strength, moisture permeability and air permeability prevention so as to secure heat resistance and chemical resistance while protecting the electrode assembly.
- nylon or polyethylene terephthalate may be used, but is not limited thereto.
- the accommodating part 210 may be formed in both the upper and lower portions of the case 200 , or may exist only in either one of the upper and lower portions. At this time, it may be more preferable to exist only in either the upper or lower part because it can reduce the surplus space of the terrace part.
- the case 200 seals the outer surface of the accommodating part 210 to prevent substances in the accommodating part 210 from being discharged to the outside.
- the sealing portion 220 formed by sealing is bent in the direction of the receiving portion 210 to improve the energy density of the battery module.
- the terrace portion from which the electrode lead 110 protrudes in one direction or in both directions among the sealing portion 220 protrudes from the receiving portion 210 .
- the gas discharge part 230 may be located in the sealing part 220 .
- the gas discharge part 230 may be present in any part of the sealing part 220 .
- the gas discharge unit 230 may be disposed at a portion where the electrode lead 100 is present as shown in FIG. 2 .
- FIG 3 is a cross-sectional view according to the first embodiment of the pouch-type secondary battery according to the present invention.
- a material constituting the gas discharge unit 230 is applied to the sealing unit 220 of the case 200 , that is, a laminate sheet to the electrode lead 110 . may be combined with Through such a structure, a gas discharge passage may be secured while increasing the coupling force between the gas discharge unit 230 and the sealing unit 220 .
- FIG. 4 is a cross-sectional view showing a second embodiment of the pouch-type secondary battery according to the present invention.
- a material constituting the gas discharge unit 230 is coated on the surface of the electrode lead 110 and bonded thereto, and then this is applied to the case 200 .
- a form combined with is also possible. This may reduce a space that may be formed of the electrode lead 110 , that is, an unsealed portion, while enabling smooth movement of the gas discharged through the gas discharge unit 230 .
- the gas discharge part 230 may serve to couple the electrode lead 100 and the sealing part 220 between the electrode lead 100 and the sealing part 220 .
- the gas discharge unit 230 includes the case 200 made of a laminate sheet, that is, the inner layer 221 of the sealing unit 220 including the outer layer 221 , the metal layer 222 , and the inner layer 221 , and In order to increase the bonding force of the gas discharge unit 230, the gas penetrating unit 231 located on the electrode lead 110 facing surface and the coating unit 232 for improving bonding strength on the inner layer 22 facing surface may be provided.
- the gas penetrating unit 231 located on the electrode lead 110 facing surface and the coating unit 232 for improving bonding strength on the inner layer 22 facing surface may be provided.
- the gas penetrating part 231 may include at least one of fluorine-based, olefin-based, acrylic-based polymer and ceramic, and is attached to the lead metal bonding surface for MAH (Maleic) adhesion performance with the lower lead metal. anhydride) treatment or other chemical treatment capable of forming -OH (hydroxyl) groups. This is advantageous in improving the bonding strength of the two materials to be bonded.
- the gas penetrating portion 231 may include a layer including pores for gas permeation in a horizontal direction.
- the coating part 232 may be directly coated on the gas exhaust part 230 or may be coated on the inner layer 221 to be coupled to the gas exhaust part 230 .
- a material having high bonding strength between the material constituting the gas discharge unit 230 and the material constituting the inner layer 221 may be used.
- the coating part 232 may be made of a polypropylene material.
- the thickness of the coating portion 232 may be 50 ⁇ m to 500 ⁇ m. When the coating part 232 is fused with the pouch, the thickness may be reduced by heat and pressure, and if it is too thin, there is a risk that the sealing strength may be reduced.
- the presence of the coating part 232 makes it possible to better seal between the sealing part 220 and the electrode lead 110 .
- the gas discharge unit 230 may be made of a gas discharge material that is stable under the secondary battery operating condition and has a gas permeability greater than a water permeability.
- a gas-discharge material a material having a moisture penetration rate of 50 ppm or less for one year may be used.
- the outgassing material may be, for example, polypropylene, polytetrafluoroethylene, polyethylene, polyethylene tetraphthalate, or a mixture thereof.
- the polypropylene, polyvinylidene difluoride, polytetrafluoroethylene, polyethylene, polyethylene tetraphthalate, or a mixture thereof has a characteristic that can suppress moisture penetration while discharging gases such as carbon dioxide, methane, ethane, It is possible to ensure that the operation of the battery can be stably maintained while discharging the gas mainly generated by the lithium-ion battery.
- polypropylene, polyvinylidene difluoride, etc. which has a high bonding strength with the laminate sheet and is easy to seal than other materials.
- the thickness of the gas permeable part 230 may be 100 ⁇ m or more and 600 ⁇ m or less.
- the amount of gas passing through the gas transmission part 230 is limited, so that a desired gas discharge effect may not be obtained, and when the gas transmission part 230 exceeds 600 ⁇ m Since the gas permeation part 230 is too thick, the thickness of the secondary battery may be increased, and a desired sealing force may not be obtained.
- the secondary battery according to the present invention comprises the steps of (S1) applying a gas-discharge material having a gas permeability greater than water permeability to at least a portion of the electrode lead surface of the electrode assembly, and (S2) the number of inside the case made of a laminate sheet for the electrode assembly It may include a step of sealing after receiving the payment.
- step (S1) a gas-discharge material may be applied to the case instead of the electrode lead surface. Its position may be changed according to the bonding force and sealing force of the gas emitting material.
- outgassing material examples include polypropylene (PP), polytetrafluoroethylene (PTFE), polyethylene (PE), polyethylene tetraphthalate (PET), or a mixture thereof, of which polypropylene is the electrode lead.
- PP polypropylene
- PTFE polytetrafluoroethylene
- PE polyethylene
- PET polyethylene tetraphthalate
- the bonding force between the case and the laminate sheet is high, so it can be placed in any part of the sealing part of the case, but in the case of polytetrafluoroethylene, a lot of time and high temperature are required for sealing, so that the above It is preferable that the electrode lead is disposed in a portion through which the overall sealing force of the secondary battery is not reduced.
- the gas exhaust material and the case may be combined by thermal fusion at least once to 10 times.
- the number and time of thermal fusion may vary depending on the characteristics of the gas-discharging material and the bonding force between the electrode lead and the case.
- the thermal fusion method may be a method of pressing with a force of 1kg/mm to 100kg/mm while applying heat of 150°C to 250°C. When pressurized at a temperature higher than the above temperature, the electrode assembly and the case may be damaged, and when fused at a temperature lower than the above, the adhesive material may not melt properly.
- the thermal fusion method may be performed using a laser in addition to a method using heat.
- a laminate sheet or electrode lead used as a case may be immersed in a solution made of a gas-discharge material to be coated.
- the dipping method may be exemplified by spin coating, slot-die coating, doctor blading, bar coating, dipping process, and the like.
- the gas discharge unit may be subjected to a surface modification process in order to increase bonding force with the electrode lead or the case.
- the surface modification process may be performed using UV curing or plasma.
- the thickness of the gas outlet may be 100 ⁇ m or more and 600 ⁇ m or less.
- the thickness of the gas discharge part is too thin, it is difficult to smoothly discharge gas and moisture penetrates, whereas when the thickness of the gas discharge part is too thick, moisture penetration is easy due to the thickness of the gas discharge part, thereby reducing the performance of the battery Because.
- a dummy cell without an electrode and a separator was formed in the shape according to the first embodiment of the present invention. At this time, the gas outlet was coated with polypropylene having a thickness of 100 ⁇ m.
- Moisture permeation of the dummy cell is measured by accelerating the rate of water permeation in a high-temperature and high-humidity environment, and after accelerated storage, a portion of the solution in the sealed container is extracted and titrated using a titrator.
- samples were placed in a chamber set at high temperature and high humidity (60° C., RH 90%) and the change in water penetration was measured for one week.
- the moisture content penetrating into the secondary battery was measured by increasing the concentration of HF formed according to the reaction of the electrolyte.
- 0.1 g of HF in the secondary battery corresponds to 500 ppm permeation of water (H 2 O) for 10 years.
- FIG. 5 is a graph comparing moisture permeability when polypropylene is used in the gas outlet according to the present invention and when the gas outlet is not provided.
- the moisture permeation rate of Experimental Example 1 (Ex. 1) and Experimental Example 2 (Ex. 2) according to the present invention is not as good as that of Comparative Example 1 (Comp.Ex. 1). This is due to the nature of the pouch-type case that is not sealed, and some moisture may penetrate.
- Comparative Example 1 Comparative Example 1
- polypropylene PP
- polytetrafluoroethylene PTFE
- PE polyethylene
- PET polyethylene tetraphthalate
- PP polypropylene
- PTFE polytetrafluoroethylene
- PE polyethylene
- PET polyethylene tetraphthalate
- the pressure change inside the pouch-type secondary battery in which polypropylene (Second Experimental Example 1, Ex.1) of 100 ⁇ m thick was placed in the gas outlet according to the present invention was measured for 24 hours.
- the inside of the pouch-type secondary battery was artificially injected with carbon dioxide gas generated a lot in the secondary battery from the outside. At this time, about 0.0161 atm of carbon dioxide gas was injected for 20 hours.
- FIG. 6 is a graph comparing the gas permeability when 100 ⁇ m thick polypropylene is used in the gas outlet according to the present invention and when the gas outlet is not provided.
- FIG. 7 in the case of the second experimental example 1 (Ex.1), it can be seen that the pressure inside the pouch-type secondary battery was reduced because the gas was discharged more than that of the second comparative example 1 (Comp.Ex.1).
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
Description
Claims (13)
- 전극조립체를 수납하는 수납부, 상기 수납부 주변을 밀봉하여 형성된 밀봉부 및 상기 밀봉부에서 일단은 상기 수납부에 접촉하고 타단은 외부에 접촉하여 가스만을 선택적으로 배출하는 가스 배출부를 구비한 파우치형 케이스.
- 제1항에 있어서,상기 가스 배출부는 가스 투과도가 수분 투과도보다 큰 가스배출 물질로 이루어진 것을 특징으로 하는 파우치형 케이스.
- 제2항에 있어서,상기 가스배출 물질은 1년간 50ppm 이하의 수분 침투율을 가지는 것을 특징으로 하는 파우치형 케이스.
- 제3항에 있어서,상기 가스 배출 물질은 폴리프로필렌(PP), 폴리테트라플루오로에틸렌(PTFE), 폴리에틸렌(PE), 폴리에틸렌 테트라프탈레이트(PET) 또는 이들의 혼합물인 것을 포함하는 파우치형 케이스.
- 제1항에 있어서,상기 가스 배출부의 두께는 100㎛ 이상 600㎛ 이하인 것을 특징으로 하는 파우치형 케이스.
- 제1항에 있어서,상기 가스 배출부는 상기 전극조립체에서 외부로 돌출되어 있는 전극 리드를 감싸는 것을 특징으로 하는 파우치형 케이스.
- 제1항에 있어서,파우치형 케이스는 라미네이트 시트를 포함하여 이루어져 있고,상기 가스 배출부와 상기 라미네이트 시트 접촉부가 폴리프로필렌으로 코팅되어 있는 것을 특징으로 하는 파우치형 케이스.
- 제1항 내지 제7항 중 어느 한 항에 따른 파우치형 케이스; 및전극조립체;를 포함하는 이차전지.
- (S1) 전극조립체의 전극 리드 표면 중 적어도 일부에 수분 투과도보다 가스 투과도가 큰 가스배출 물질을 도포하는 단계; 및(S2) 상기 전극조립체를 가스 배출부가 구비된 파우치형 케이스 내부의 수납부에 수납 후 밀봉하는 단계;를 포함하는 이차전지 제조방법.
- 제9항에 있어서,상기 가스배출 물질은 폴리프로필렌(PP), 폴리테트라플루오로에틸렌(PTFE), 폴리에틸렌(PE), 폴리에틸렌 테트라프탈레이트(PET) 또는 이들의 혼합물인 것을 포함하는 이차전지 제조방법.
- 제9항에 있어서,상기 (S2) 단계에서 상기 가스배출 물질과 상기 파우치형 케이스는 적어도 1회 내지 10회의 열융착에 의해 결합되는 것을 특징으로 하는 이차전지 제조방법.
- 제9항에 있어서,상기 가스 배출부는 표면 개질 과정을 거치는 것을 특징으로 하는 이차전지 제조방법.
- 제9항에 있어서,상기 가스 배출부의 두께는 100㎛ 이상 600㎛ 이하인 것을 특징으로 하는 이차전지 제조방법.
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JP2022560124A JP2023521312A (ja) | 2020-07-10 | 2021-07-07 | ガス排出のためのガス排出部を含む二次電池及び二次電池の製造方法 |
US18/011,735 US20230318133A1 (en) | 2020-07-10 | 2021-07-07 | Secondary Battery Including Gas Discharge Portion Configured to Discharge Gas and Secondary Battery Manufacturing Method |
CN202180017921.7A CN115210947A (zh) | 2020-07-10 | 2021-07-07 | 包括用于排气的气体排出部分的二次电池及制造二次电池的方法 |
EP21837012.0A EP4131614A4 (en) | 2020-07-10 | 2021-07-07 | SECONDARY BATTERY COMPRISING A GAS DISCHARGE PART FOR GAS DISCHARGE AND METHOD FOR MANUFACTURING SECONDARY BATTERY |
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KR1020210078634A KR20220007511A (ko) | 2020-07-10 | 2021-06-17 | 가스 배출을 위한 가스 배출부를 포함하는 이차전지 및 이차전지 제조방법 |
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