WO2013002496A2 - 절연부재가 장착된 이차전지 - Google Patents
절연부재가 장착된 이차전지 Download PDFInfo
- Publication number
- WO2013002496A2 WO2013002496A2 PCT/KR2012/004386 KR2012004386W WO2013002496A2 WO 2013002496 A2 WO2013002496 A2 WO 2013002496A2 KR 2012004386 W KR2012004386 W KR 2012004386W WO 2013002496 A2 WO2013002496 A2 WO 2013002496A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- secondary battery
- insulating member
- fine pores
- battery
- polymer resin
- Prior art date
Links
- 239000012212 insulator Substances 0.000 title abstract 4
- 239000011148 porous material Substances 0.000 claims abstract description 29
- 239000003792 electrolyte Substances 0.000 claims abstract description 23
- 235000015110 jellies Nutrition 0.000 claims abstract description 8
- 239000008274 jelly Substances 0.000 claims abstract description 8
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 18
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 18
- -1 polyethylene Polymers 0.000 claims description 16
- 239000004745 nonwoven fabric Substances 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 239000002952 polymeric resin Substances 0.000 claims description 10
- 229920003002 synthetic resin Polymers 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 8
- 239000002759 woven fabric Substances 0.000 claims description 8
- 238000004049 embossing Methods 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 229920001748 polybutylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims description 2
- 229920003051 synthetic elastomer Polymers 0.000 claims description 2
- 239000005061 synthetic rubber Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 229920002223 polystyrene Polymers 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 5
- 239000011324 bead Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 17
- 238000005470 impregnation Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910001111 Fine metal Inorganic materials 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000010294 electrolyte impregnation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
-
- 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
-
- 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
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/463—Separators, membranes or diaphragms characterised by their shape
- H01M50/469—Separators, membranes or diaphragms characterised by their shape tubular or cylindrical
-
- 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
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
-
- 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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to a secondary battery, and more particularly, a secondary battery having a structure in which a jelly-roll having a cathode / separation membrane / cathode structure is mounted in a cylindrical battery case, and having a plate-like structure mounted on an upper end of the jelly-roll.
- the insulating member has openings perforated on the insulating member for gas discharge and penetration of the electrode terminals, fine pores having a size that allows the electrolyte to pass through and does not pass foreign matter, and transversely on one or both sides of the insulating member.
- the present invention relates to a secondary battery including strip-shaped or bead-shaped protrusions formed in a direction and / or a longitudinal direction.
- lithium secondary batteries with high energy density, high operating voltage, and excellent storage and life characteristics are used for various mobile devices as well as various electronic products. It is widely used as an energy source.
- the electrode assembly embedded in the battery case is a power generator capable of charging and discharging composed of a laminated structure of a positive electrode, a separator, and a negative electrode, a jelly-roll type wound through a separator between a long sheet type anode and an anode coated with an active material, and A plurality of positive and negative electrodes of a predetermined size are classified into a stack type in which a separator is sequentially stacked, and a stack / fold type which is a composite structure of a jelly-roll type and a stack type.
- the jelly-roll type electrode assembly has advantages of easy manufacturing and high energy density per weight.
- FIG. 1 a structure of a conventional cylindrical secondary battery is shown in FIG. 1, and an insulating member generally used in the cylindrical secondary battery is schematically illustrated in FIGS. 2 and 3 as a plan view.
- the cylindrical secondary battery 100 accommodates the jelly-roll type (winding type) electrode assembly 120 in the battery case 130 and injects the electrolyte solution into the battery case 130.
- the electrode assembly 120 has a structure in which a cathode 121, a cathode 122, and a separator 123 are interposed therebetween, and then wound in a rounded shape, and at its core (center of jelly-roll), a cylindrical center pin ( 150) is inserted.
- the center pin 150 is generally made of a metal material to impart a predetermined strength, and has a hollow cylindrical structure in which a plate is rounded.
- the center pin 150 acts as a passage for fixing and supporting the electrode assembly and for discharging gas generated by internal reaction during charging and discharging and operation.
- the upper surface of the electrode assembly 120 is mounted with a plate-shaped insulating member 180a, the gas can be discharged and the positive electrode tab 142 of the electrode assembly 120 is a cap plate of the cap assembly 140
- An opening 181a is formed at the center thereof to communicate with the through hole 151 of the center pin 150.
- the insulating member 180a positioned at the top of the jelly-roll is a structure that blocks a path through which the electrolyte penetrates into the battery during the battery pouring process. Therefore, since the electrolyte penetrates into the battery only through the opening 181a communicating with the center pin 150 and the portion where the insulating member 180a is not located, a lot of time is required for the pouring process and as a result, the productivity is increased. Have problems falling
- a structure in which a plurality of through holes 182b are formed around the opening 181b in some insulating members 180b may be proposed.
- conductive impurity particles such as metal powder generated during manufacturing and / or assembling of the cap assembly 140 and the battery case 130 may be formed through the through holes 182b formed in the insulating member 180b. Inflow to 120 may result in a short circuit or a drawback that significantly degrades the battery life characteristics.
- the present invention aims to solve the problems of the prior art as described above and the technical problem that has been requested from the past.
- An object of the present invention is to provide a secondary battery having a structure that can improve the permeability of the electrolyte by the insulating member of the novel structure and improve the safety, performance and manufacturing processability of the battery.
- a secondary battery according to the present invention for achieving the above object is a secondary battery having a structure in which a jelly-roll of a cathode / separation membrane / cathode structure is mounted in a cylindrical battery case, and an insulating member having a plate-like structure at an upper end of the jelly-roll.
- Fine pores having a size that allows the electrolyte to pass through and does not pass foreign matter
- Strip-shaped or bead-shaped protrusions formed in one side or both sides of the insulating member in the transverse direction and / or the longitudinal direction;
- Consists of a structure comprising a.
- a cylindrical secondary battery inserts a jelly roll into a cylindrical can, mounts an insulating member on the top of the jelly roll, and then passes through a beading process to fix the jelly roll.
- This beading process is performed by applying pressure in the vertical direction while indenting the outer circumferential surface of the cylindrical can using metal.
- fine metal pieces are generated. As these fine metal pieces enter the cell, they cause a short circuit. Therefore, the insulating member should be able to smoothly inject the electrolyte without passing foreign matter such as the fine metal pieces.
- the cylindrical secondary battery by the insulating member of the above structure mounted on the top of the jelly-roll, the electrolyte can penetrate over the entire surface of the insulating member when the electrolyte is injected, so that the main liquidity is greatly improved, relatively large
- the occurrence of shorts can be prevented as compared with the insulating member of the prior art including through holes of diameter, which is very preferable. This can be confirmed by the experimental results described later.
- the strip-shaped or bead-shaped protrusions may be formed by compressing portions other than the protrusions, and because of this structure, the mechanical rigidity of the insulating member may be improved.
- the inventors of the present application confirmed that by forming the protrusions as described above, it is possible to ensure the desired mechanical rigidity while maintaining the porosity.
- the protrusions as described above, it is possible to increase the surface friction force. That is, in the manufacturing process of the cylindrical battery, in the beading process for fixing the jelly-roll after mounting the insulating member, if the frictional force of the insulating member is too small, preventing the problem of damaging the penetrated electrode terminal while rotating the insulating member can do.
- the insulating member is not particularly limited as long as it is an insulating material, and may be formed of various materials.
- the insulating member may be formed of an electrically insulating polymer resin or an electrically insulating polymer composite.
- the polymer resin may be polyethylene (PE), poly It may be at least one selected from the group consisting of propylene (PP), polybutylene (PB), polystyrene (PS), polyethylene terephthalate (PET), natural rubber and synthetic rubber.
- the micro-pores as described above, have a size that allows the electrolyte to pass through when the electrolyte is injected while providing an electrically insulating state which is a function of the insulating member.
- the diameter of the micropores may range from 1 ⁇ m to 100 ⁇ m.
- the fine pores may be formed over the entire surface of the insulating member at equal intervals.
- the same spacing between each other also refers to the spacing between pores that are perforated on the insulating member.
- the insulating member according to the present invention may be made in various forms.
- the insulating member may be formed of a molded body of a polymer resin or a polymer composite, and may have a structure in which fine pores are perforated through the molded body.
- the insulating member may have a structure in which long fibers of the polymer resin or the polymer composite form micropores and form a woven fabric.
- the insulating member may have a structure in which short fibers of the polymer resin or the polymer composite form micropores and form a nonwoven fabric.
- the permeation of the electrolyte may be relatively disadvantageous compared to the form of the nonwoven fabric or the woven fabric due to the surface tension and the restoring force of the perforated portion, and the gas discharge may be relatively lowered.
- the warpage phenomenon warping phenomenon caused when the extrusion sheet is formed does not occur, there is a relatively excellent processability advantage.
- the short fibers may be partially bonded by, for example, needle punching, heat fusion, or an adhesive to form a nonwoven fabric.
- Nonwoven fabrics consist of fibers that are entangled without orientation. These fibers may be partially joined by needle punching, heat fusion, or adhesives so that they can be fixed in an entangled form.
- the protrusions may be checkered while crossing in the transverse and longitudinal directions.
- the protrusions may be checkered while crossing in the transverse and longitudinal directions.
- there may be a difference in mechanical stiffness according to the directionality it may be preferable to be configured in a checkered shape while crossing in the transverse direction and the longitudinal direction as described above.
- the protrusions may be shaped to form an embossed structure on the front surface of the insulating member.
- embossing structure it is possible to increase the mechanical rigidity and the surface friction force.
- the embossing structure may have a form in which a portion that is not thermally fused forms a protrusion by thermally fusion a portion of the insulating member.
- Each of the protrusions and the heat-sealed portion may be of an island type or a continuous shape.
- the insulating member is made of a non-woven fabric of short fibers
- the bonding sites are distributed by heat fusion at equal intervals on the front surface of the insulating member, the partition wall shape of the heat-welded between the bonding sites It may be a structure in which the protrusions are located.
- the thickness of the insulating member has a size of 0.1 mm to 0.5 mm. If the thickness of the insulating member is too thin, it may be difficult to sufficiently exhibit the original electrical insulating function of the insulating member, on the contrary, if the thickness of the insulating member is too thick, the battery capacity is reduced by causing the size of jelly-roll in the battery case of the same standard. Therefore, it is not preferable.
- the secondary battery according to the present invention may be preferably applied to a lithium secondary battery prepared by impregnating a lithium-containing electrolyte in the jelly-roll.
- the present invention can also provide a device including the secondary battery as a power source.
- the device according to the present invention can be preferably used in electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles and power storage devices, etc. in consideration of excellent life characteristics and safety, as well as mobile devices such as mobile phones and portable computers.
- FIG. 1 is a schematic cross-sectional view of a cylindrical secondary battery
- FIG. 2 is a plan view of an insulating member used in the secondary battery of FIG. 1;
- FIG. 3 is a plan view of another type of insulating member used in the secondary battery of FIG. 1;
- FIG. 4 is a plan view of an insulating member according to one embodiment of the present invention.
- FIG. 5 is a perspective view of an insulating member according to an embodiment of the present invention.
- FIG. 4 is a schematic plan view of an insulating member according to an embodiment of the present invention
- FIG. 5 is a perspective view of an insulating member according to an embodiment of the present invention.
- the secondary battery 100 includes a jelly roll 120 having a structure of a cathode 121, a separator 123, and a cathode 122 mounted on a cylindrical battery case 130.
- a jelly roll 120 having a structure of a cathode 121, a separator 123, and a cathode 122 mounted on a cylindrical battery case 130.
- an insulating member 180c having a plate-like structure is mounted on the upper end of the jelly-roll 120.
- the insulating member 180c is made of polyethylene terephthalate (PET) having a thickness of about 0.4 mm, an opening 181c is perforated on one side, and a plurality of pores 182c having a diameter of 10 to 30 ⁇ m are spaced at the same interval from each other. It is formed over the whole surface of the insulating member 180c, and the intaglio embossing 183 structure is comprised in the longitudinal direction and the lateral direction, and forms the protrusion part corresponding to continuous anode embossing.
- PET polyethylene terephthalate
- the electrolyte penetrates over the entire surface of the insulating member 180c by the plurality of micropores 182c, the liquid injection property is greatly improved, and short generation can be prevented.
- the mechanical rigidity of the insulating member may be increased and the surface frictional force may be increased to improve processability.
- PET Polyethylene terephthalate
- a 6 mm wide, 2.5 mm vertical opening is perforated on one side, a number of fine pores having a diameter of 1 to 30 ⁇ m They were uniformly distributed over the entire surface at uniform intervals of about 10 to 30 ⁇ m, and an insulated embossed structure was formed in a pattern to prepare an insulating member. Then, the insulating member is mounted on the jelly-roll top of the structure in which the anode / separation membrane / cathode is wound by the center pin, and fine metal powders generally generated in the battery assembly process are placed on the insulating member. In the state, a cylindrical secondary battery of 18650 standard (diameter 18 mm, length 65 mm) was produced.
- an insulating member and a secondary battery were produced in the same manner as in Example 1.
- Example 1 Using a polyethylene terephthalate (PET) woven fabric that forms fine pores of 15 ⁇ m as a material of the insulating member, an insulating member having a negative embossed structure in a pattern was formed. Except for using the insulating member, a secondary battery was manufactured in the same manner as in Example 1.
- PET polyethylene terephthalate
- Example 1 Using a polyethylene terephthalate (PET) nonwoven fabric having fine pores of 15 mu m on average as a raw material of the insulating member, an insulating member having a negative embossed structure in a pattern was formed. Except for using the insulating member, a secondary battery was manufactured in the same manner as in Example 1.
- PET polyethylene terephthalate
- an insulating member and a secondary battery were manufactured in the same manner as in Example 1.
- an insulating member and a secondary battery were manufactured in the same manner as in Example 1.
- An insulating member and a secondary battery were manufactured in the same manner as in Example 1, except that a plurality of micropores having a diameter of 150 ⁇ m were uniformly distributed on the entire surface at uniform intervals of about 120 ⁇ m.
- An insulating member and a secondary battery were manufactured in the same manner as in Comparative Example 1, except that polyethylene terephthalate (PET) woven fabric which did not form fine pores was used as a material of the insulating member.
- PET polyethylene terephthalate
- cap assembly was welded to the open top of the secondary battery manufactured as described above, and each produced 10 pieces, and the charging and discharging experiment was conducted to check whether the short circuit occurred, and the results are shown in Table 1 below.
- the batteries of Examples 1 to 5 of the present invention can be confirmed that the impregnation time of the electrolyte is significantly shorter than the comparative example 1 or 4. That is, it can be seen that the electrolyte has effectively passed through the plurality of micropores formed in the insulating member.
- the battery of Comparative Example 2 has improved impregnation compared to the battery of Comparative Example 1, the short circuit rate is relatively large, and the battery of Comparative Example 3 also shows the impregnation similar to that of Examples 1 and 2, but the short circuit rate is relatively You can see the largeness. This was confirmed to be due to the passage of the metal powder through the relatively large pores causing a short circuit inside the jelly-roll.
- the battery of Comparative Example 1 shows a higher short-circuit rate than the batteries of Examples 1 and 2, although the fine pores as in Examples 1 and 2 are not perforated in the insulating member attached thereto. give.
- This high short-circuit rate while the metal powders on the micropores in the cells of Examples 1 and 2, the movement is suppressed, whereas in the battery of Comparative Example 1 is free to move on the smooth surface of the insulating member, opening or insulation It is thought to be due to the movement to the jelly-roll through the outer peripheral surface of the member.
- the battery of Example 3 only differs from Example 1 in the material of the sheet, and its impregnation and short-circuit rate show almost the same performance.
- the batteries of Examples 4 and 5 using a coarse woven fabric and a nonwoven fabric are impregnated with an electrolyte solution compared to Comparative Examples 1, 4, or 5 because of the fine pores formed in the tissue itself without undergoing separate micropores. You can see that the time is significantly reduced.
- the battery of Comparative Example 5 shows a finely improved impregnation time compared to the battery of Comparative Example 1 using a PET sheet by using a woven fabric that does not form micropores in the tissue itself, but compared to the Examples impregnation performance It can be confirmed that this is lowered.
- the secondary battery according to the present invention includes an insulating member having fine pores formed on the front surface and having protrusions formed thereon, thereby preventing the occurrence of a short circuit and allowing electrolyte to permeate through the insulating member. There is an effect that can greatly improve the safety, performance and life characteristics of the battery and manufacturing processability of the battery.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Cell Separators (AREA)
- Filling, Topping-Up Batteries (AREA)
Abstract
Description
Claims (16)
- 양극/분리막/음극 구조의 젤리-롤이 원통형 전지케이스에 장착되어 있는 구조의 이차전지로서, 상기 젤리-롤의 상단에 탑재되는 판상 구조의 절연부재는,가스 배출 및 전극단자의 관통을 위해 절연부재 상에 천공되어 있는 개구;전해액을 통과시키고 이물(異物)을 통과시키지 않는 크기를 가진 미세 기공들; 및절연부재의 일면 또는 양면에서 횡방향 및/또는 종방향으로 형성되어 있는 스트립 형상 또는 비드 형상의 돌기부들;을 포함하고 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 절연부재는 전기절연성 고분자 수지 또는 전기절연성 고분자 복합체로 이루어진 것을 특징으로 하는 이차전지.
- 제 2 항에 있어서, 상기 고분자 수지는 폴리에틸렌, 폴리프로필렌, 폴리부티렌, 폴리스틸렌, 폴리에틸렌 테레프탈레이트, 천연고무 및 합성고무로 이루어진 군에서 선택되는 하나 이상인 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 미세 기공들의 직경은 1 ㎛ 내지 100 ㎛의 범위에 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 미세 기공들은 상호 동일한 간격으로 절연부재의 전면에 걸쳐 형성되어 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 절연부재는 고분자 수지 또는 고분자 복합체의 성형체로 이루어져 있고, 상기 성형체를 관통하여 미세 기공들이 천공되어 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 절연부재는 고분자 수지 또는 고분자 복합체의 장섬유들이 미세 기공들을 형성하면서 직포 형태를 이루고 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 절연부재는 고분자 수지 또는 고분자 복합체의 단섬유들이 미세 기공들을 형성하면서 부직포 형태를 이루고 있는 것을 특징으로 하는 이차전지.
- 제 8 항에 있어서, 상기 단섬유들은 니들 펀칭, 열융착 또는 접착제에 의해 부분 결합되어 부직포 형태를 이루고 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 돌기부들은 횡방향과 종방향으로 교차하면서 체크 무늬를 이루고 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 돌기부들은 절연부재의 전면에 엠보싱 구조를 형성하고 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 절연부재는 단섬유들의 부직포 형태로 이루어져 있고, 절연부재의 전면에 등간격으로 열융착에 의한 결합 부위들이 분포되어 있으며, 상기 결합 부위들 사이에 미열융착된 격벽 형상의 돌기부들이 위치해 있는 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 절연부재의 두께는 0.1 mm 내지 0.5 mm 크기인 것을 특징으로 하는 이차전지.
- 제 1 항에 있어서, 상기 전지는 리튬 이차전지인 것을 특징으로 하는 이차전지.
- 제 1 항 내지 제 14 항 중 어느 하나에 따른 이차전지를 전원으로 포함하는 것을 특징으로 하는 디바이스.
- 제 15 항에 있어서, 상기 디바이스는 휴대폰, 휴대용 컴퓨터, 전기자동차, 하이브리드 전기자동차, 플러그-인 하이브리드 전기자동차, 및 전력저장장치로부터 선택되는 것을 특징으로 하는 디바이스.
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CN201280030143.6A CN103782436B (zh) | 2011-06-30 | 2012-06-04 | 包括绝缘体的二次电池 |
EP12805102.6A EP2706604B1 (en) | 2011-06-30 | 2012-06-04 | Secondary battery provided with insulator |
US14/127,443 US9299967B2 (en) | 2011-06-30 | 2012-06-04 | Secondary battery comprising insulator |
JP2014515714A JP5730442B2 (ja) | 2011-06-30 | 2012-06-04 | 絶縁部材が装着された二次電池 |
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JP (1) | JP5730442B2 (ko) |
KR (1) | KR101300585B1 (ko) |
CN (1) | CN103782436B (ko) |
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KR102176432B1 (ko) * | 2017-02-13 | 2020-11-09 | 주식회사 엘지화학 | 원통형 이차 전지 절연부재 |
WO2019146926A1 (ko) * | 2018-01-29 | 2019-08-01 | 주식회사 엘지화학 | 이차 전지 및 이차 전지용 절연판 |
KR102268405B1 (ko) | 2018-01-29 | 2021-06-24 | 주식회사 엘지에너지솔루션 | 이차 전지용 절연판 및 그의 제조 방법 |
KR102595153B1 (ko) | 2019-03-20 | 2023-10-27 | 주식회사 엘지에너지솔루션 | 이차전지용 절연판 및 그 절연판을 포함하는 이차전지 |
KR20240132869A (ko) * | 2023-02-27 | 2024-09-04 | 삼성에스디아이 주식회사 | 이차 전지 |
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US11152638B2 (en) | 2017-06-02 | 2021-10-19 | Lg Chem, Ltd. | Secondary battery |
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EP2706604A2 (en) | 2014-03-12 |
JP2014523610A (ja) | 2014-09-11 |
EP2706604B1 (en) | 2016-09-14 |
EP2706604A4 (en) | 2014-06-04 |
US9299967B2 (en) | 2016-03-29 |
TW201301634A (zh) | 2013-01-01 |
US20140186670A1 (en) | 2014-07-03 |
CN103782436A (zh) | 2014-05-07 |
KR101300585B1 (ko) | 2013-08-27 |
TWI520414B (zh) | 2016-02-01 |
KR20130004074A (ko) | 2013-01-09 |
JP5730442B2 (ja) | 2015-06-10 |
WO2013002496A3 (ko) | 2013-04-04 |
CN103782436B (zh) | 2016-08-17 |
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