WO2009099279A2 - 리튬 이차 전지 및 이의 제조 방법 - Google Patents
리튬 이차 전지 및 이의 제조 방법 Download PDFInfo
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- WO2009099279A2 WO2009099279A2 PCT/KR2009/000379 KR2009000379W WO2009099279A2 WO 2009099279 A2 WO2009099279 A2 WO 2009099279A2 KR 2009000379 W KR2009000379 W KR 2009000379W WO 2009099279 A2 WO2009099279 A2 WO 2009099279A2
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- Prior art keywords
- electrode
- secondary battery
- lithium secondary
- electrode tab
- active material
- Prior art date
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 113
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 35
- 239000011149 active material Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims description 24
- 238000004804 winding Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 20
- 239000007774 positive electrode material Substances 0.000 description 19
- 239000007773 negative electrode material Substances 0.000 description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 239000002002 slurry Substances 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 8
- 239000010949 copper Substances 0.000 description 8
- 238000003466 welding Methods 0.000 description 7
- 239000003792 electrolyte Substances 0.000 description 6
- 229910052759 nickel Inorganic materials 0.000 description 6
- 238000003487 electrochemical reaction Methods 0.000 description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000020169 heat generation Effects 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 description 2
- 239000006183 anode active material Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- MYWGVEGHKGKUMM-UHFFFAOYSA-N carbonic acid;ethene Chemical compound C=C.C=C.OC(O)=O MYWGVEGHKGKUMM-UHFFFAOYSA-N 0.000 description 2
- 239000006182 cathode active material Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011244 liquid electrolyte Substances 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 229910021382 natural graphite Inorganic materials 0.000 description 2
- 229920000131 polyvinylidene Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000314 transition metal oxide Inorganic materials 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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
- 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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- 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
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/49114—Electric battery cell making including adhesively bonding
Definitions
- the present invention relates to a lithium secondary battery, and more particularly, to a lithium secondary battery and a method of manufacturing the same, which can improve characteristics by improving a structure.
- a chemical battery refers to a battery that generates electrical energy by using a chemical reaction.
- the chemical battery may be classified into a primary battery used for single use and a secondary battery that can be repeatedly used because it can be charged and discharged. Due to the advantages that can be used repeatedly, the use of secondary batteries is gradually increasing.
- lithium secondary batteries have high energy density per unit weight, and thus are widely used in electronic communication devices or high-power hybrid vehicles.
- Such a lithium secondary battery is generally formed by including a positive electrode and a negative electrode positioned with a separator interposed therebetween, a positive electrode tab and a negative electrode tab respectively connected to the positive electrode and the negative electrode.
- the positive electrode tab and the negative electrode tab that is, the electrode tab are connected to the positive electrode and the negative electrode, that is, one end of the electrode, so that a long distance of movement of the current during operation of the lithium secondary battery is long.
- the distance between the other end of the electrode to which the electrode tab is not connected and the electrode tab corresponds to approximately the entire length of the electrode.
- a long moving distance of the current may cause a problem such as high temperature discharge characteristics, and a high temperature of the lithium secondary battery due to heat generated by the current movement.
- the present invention was devised to solve the above problems, and an object of the present invention is to provide a lithium secondary battery and a method for manufacturing the same, which can reduce the moving distance of current to improve high rate discharge characteristics and minimize temperature increase during operation. There is.
- a lithium secondary battery includes a first current collector and a first active material pattern formed on the first current collector and having first symmetrical shapes with a first central plain portion interposed therebetween. electrode; A second electrode having a second current collector and second active material patterns formed on the second current collector and symmetrically formed with a second central plain portion interposed therebetween; A first electrode tab connected to the first central uncoated portion; And a second electrode tab connected to the second central uncoated portion.
- the active material patterns substantially involved in the electro-chemical reaction are symmetrically formed and the electrode tabs are connected between them, the moving distance of the current can be reduced. Accordingly, it is possible to improve the high rate discharge characteristics can be applied to a battery that requires a large output, it is possible to improve the reliability of the battery by minimizing the heat generated by the movement of the current.
- the distance between the positive electrode and the negative electrode can be minimized, thereby improving the high rate discharge characteristics of the battery and minimizing the heat generation problem. Can be.
- an electrode having a central plain portion can be easily manufactured by cutting a current collector so that a plurality of active material patterns formed at regular intervals are provided. That is, according to the method for manufacturing a lithium secondary battery according to the present invention, a lithium secondary battery capable of improving high rate discharge characteristics and exothermic characteristics can be manufactured with high productivity.
- FIG. 1 is a perspective view illustrating a lithium secondary battery according to an embodiment of the present invention.
- FIG. 2 is a plan view of the lithium secondary battery of FIG. 1 unfolded and showing a positive electrode to which a positive electrode tab is connected.
- FIG. 3 is a plan view illustrating the negative electrode to which the negative electrode tab is connected in the lithium secondary battery of FIG. 1.
- FIG. 4 is a cross-sectional view taken along line III-III ′ of the lithium secondary battery of FIG. 1.
- FIG. 5 is a flowchart illustrating steps of a method of manufacturing a lithium secondary battery according to an embodiment of the present invention.
- 6 (a) to 6 (c) are views showing the process of the electrode manufacturing step of FIG.
- FIG. 7 illustrates a process of attaching an electrode tab of FIG. 5.
- FIG 8 is a graph showing the relationship between the battery voltage and the discharge capacity when the discharge rate is 20 CmA and 25 CmA in the lithium secondary battery according to the experimental example and the lithium secondary battery according to the comparative example, respectively.
- FIG. 9 is a graph showing the relationship between the temperature increase of the lithium secondary battery according to the discharge capacity when the discharge rate is 20 CmA and 25 CmA in the lithium secondary battery according to the experimental example and the lithium secondary battery according to the comparative example, respectively.
- FIG 10 is a graph showing the relationship between the discharge capacity according to the discharge rate in the lithium secondary battery according to the experimental example and the lithium secondary battery according to the comparative example.
- FIG 11 is a graph showing the relationship between the temperature increase of the lithium secondary battery according to the discharge rate in the lithium secondary battery according to the experimental example and the lithium secondary battery according to the comparative example.
- a lithium secondary battery includes: a first electrode having a first current collector and first active material patterns formed on the first current collector and symmetrically formed with a first central plain portion interposed therebetween; A second electrode having a second current collector and second active material patterns formed on the second current collector and symmetrically formed with a second central plain portion interposed therebetween; A first electrode tab connected to the first central uncoated portion; And a second electrode tab connected to the second central uncoated portion.
- the center line passing through the center in the longitudinal direction of the first electrode may be located in the first central plain part, and the center line passing through the center in the longitudinal direction of the second electrode may be located in the second central plain part.
- the A1 and the B1 are 0.4 ⁇ B1 / A1 ⁇ 0.6 The condition of can be satisfied.
- the A2 and the B2 are 0.4 ⁇ B2 / A2 ⁇ 0.6 The condition of can be satisfied.
- Two first active material patterns may be provided and they may be formed identically to each other, and two second active material patterns may be provided and they may be identically formed to each other.
- the first electrode and the second electrode are wound together with the separator interposed therebetween, and when viewed in a cross-sectional view of the lithium secondary battery, the first electrode tab and the second electrode tab refer to the thickness center line of the lithium secondary battery. Can be located on the same side.
- the first electrode and the second electrode are wound with a separator interposed therebetween, and when viewed in a cross-sectional view of the lithium secondary battery, the first electrode tab and the second electrode tab are spaced apart from each other in the width direction of the lithium secondary battery. Can be formed.
- the method of manufacturing a lithium secondary battery according to the present invention the electrode manufacturing step of manufacturing the first electrode and the second electrode; And attaching a first electrode tab to the first electrode and attaching a second electrode tab to the second electrode.
- the electrode manufacturing step may include preparing a current collector body; Forming a plurality of active material patterns by applying active materials to the current collector body at equal intervals; And cutting the current collector body such that the plurality of active material patterns are provided to form a plurality of electrodes having a central uncoated portion between the active material patterns.
- the first electrode tab may be attached to the central uncoated portion of the first electrode and the second electrode tab may be attached to the central uncoated portion of the second electrode.
- the conditions A1 and B1 are 0.4 ⁇ B1 / A1 ⁇ 0.6. Can be satisfied.
- the A2 and the B2 are 0.4 ⁇ B2 / A2 ⁇ 0.6 The condition of can be satisfied.
- the method may further include winding the first electrode and the second electrode with the separator interposed therebetween.
- the first electrode tab and the second electrode tab may be located on the same side based on the thickness center line of the lithium secondary battery.
- the first electrode tab and the second electrode tab When viewed in a cross-section of the lithium secondary battery, the first electrode tab and the second electrode tab may be formed spaced apart from each other in the width direction of the lithium secondary battery.
- FIG. 1 is a perspective view illustrating a lithium secondary battery according to an embodiment of the present invention.
- a lithium secondary battery includes a first electrode 22 (cathode electrode, hereinafter referred to as “anode”) and a second electrode wound together with a separator 12 interposed therebetween.
- (24) anode electrode, hereinafter referred to as “cathode ")
- first electrode tab 32 (hereinafter referred to as " anode tab ") connected to the positive electrode 22, and second electrode connected to the negative electrode 24
- An electrode group including an electrode tab 34 hereeinafter referred to as a "cathode tab” and a case (not shown) for accommodating the electrode group are configured.
- the electrolyte may be charged inside the case in a liquid state, and the separator may serve as an electrolyte.
- the electrolyte may be filled into the case in a liquid state, and then a polymerizable component may be added to finally form an electrolyte in a polymer state.
- the positive electrode 22, the positive electrode tab 32, the negative electrode 24, and the negative electrode tab 34 of the lithium secondary battery according to the present exemplary embodiment will be described in detail as follows.
- FIG. 2 is a plan view showing the positive electrode 22 to which the positive electrode tab 32 is connected in the lithium secondary battery of FIG. 1
- FIG. 3 is the negative electrode 24 to which the negative electrode tab 34 is connected in the lithium secondary battery of FIG. 1.
- Is a plan view showing the expanded view. 4 is a cross-sectional view taken along line III-III 'of FIG. 1.
- the positive electrode 22 includes a first current collector 22a (hereinafter, referred to as a "positive current collector") made of a conductive material and an active material on at least one surface of the positive electrode current collector 22a. It comprises the 1st active material pattern 22b (henceforth a "positive electrode active material pattern”) apply
- the cathode current collector 22a may be made of aluminum, and the cathode active material pattern 22b may be made of a lithium-based transition metal oxide.
- the present invention is not limited thereto, and the positive electrode current collector 22a and the positive electrode active material pattern 22b may be formed of a material other than the above-described materials, which is also within the scope of the present invention.
- the positive electrode active material patterns 22b are symmetrically formed with the first center uncoated portion 22c (hereinafter, referred to as “anode center uncoated portion”) that is a portion where the positive electrode active material is not coated, and the positive electrode center The positive electrode tab 32 is connected to the uncoated portion 22c.
- the positive electrode tab 32 may be made of, for example, aluminum. However, the present invention is not limited thereto, and the positive electrode tab 32 may be made of a material other than aluminum.
- the positive electrode tab 32 may be attached to the positive electrode 22 by various methods such as ultrasonic wave, resistance, or laser welding.
- the positive electrode active material patterns 22b substantially involved in the electrochemical reaction of the battery are symmetrically formed with the positive electrode middle uncoated portion 22c interposed therebetween, and the positive electrode tab at the positive electrode central uncoated portion 22c. Since 32 is connected, it is possible to reduce the moving distance of the electric current by the electrochemical reaction.
- the maximum moving distance of the current in the present embodiment is the distance from one end to which the positive electrode tab is connected to the other end to which the positive electrode tab is not connected, and corresponds approximately to the total length of the positive electrode.
- the maximum moving distance of the current is the distance from the central plain portion 22c to which the positive electrode tab 32 is connected to one end of the positive electrode 22.
- the moving distance of the current can be significantly reduced compared to the prior art. Accordingly, it is possible to improve the high rate discharge characteristics of the lithium secondary battery and to minimize the temperature increase of the lithium secondary battery that may occur due to the movement of the current.
- the center line L1 passing through the center in the longitudinal direction of the positive electrode 22 is the positive electrode center uncoated portion so that the positive electrode active material patterns 22b substantially involved in the electro-chemical reaction of the battery may have a large area. It is preferable to locate at (22c). In the case where the center line L1 is located at a portion other than the positive electrode central plain portion 22c, the smaller area of both sides of the positive electrode central solid portion 22c is referred to in order to form the positive electrode active material patterns 22b symmetrically. Since the positive electrode active material patterns 22b must be formed, the area of the positive electrode active material patterns 22b is relatively narrow.
- the positive electrode tab 32 connected to the positive electrode center uncoated portion 22c satisfies the following expression (1) and is connected to the positive electrode 22.
- A1 is the length of the anode 22 and B1 is the distance between one end 22d in the longitudinal direction of the anode 22 and the center of the anode tab 32.
- the two positive electrode active material patterns 22b are formed to be the same. This will be described in more detail later.
- forming the same does not mean only that the positive electrode active material patterns 22b are exactly the same, and includes a case in which the positive active material patterns 22b may be determined to be substantially the same in consideration of tolerances that may occur in the manufacturing process. .
- the cathode 24 since the cathode 24 has a structure substantially the same as or similar to that of the anode 22 except for the material constituting the same, the cathode 24 may be the same as or similar to that of the anode 22. An extremely similar structure is briefly described. Since the negative electrode tab 34 also has a structure substantially the same as or similar to that of the positive electrode tab 32 except for the material constituting the same, the structure identical or similar to the positive electrode tab 32 will be briefly described.
- the negative electrode 24 includes a second current collector 24a (hereinafter referred to as a “negative current collector”) made of a conductive material and a second active material formed on at least one surface of the negative electrode current collector 24a.
- Patterns 24b (hereinafter referred to as " cathode active material pattern ").
- the negative electrode current collector 24a may be formed of, for example, copper, and the negative electrode active material pattern 24b may be formed of a carbon-based material.
- the present invention is not limited thereto, and the negative electrode current collector 24a and the negative electrode active material pattern 24b may be made of a material other than the above-described material, which is also within the scope of the present invention.
- the negative electrode active material patterns 24b are symmetrically formed with a second center uncoated portion 24c (hereinafter referred to as a "cathode center uncoated portion") that is a portion where the negative electrode active material is not coated, and the negative electrode center
- the negative electrode tab 34 is connected to the uncoated portion 24c.
- the negative electrode tab 34 may be made of nickel, copper, or nickel plated copper, for example. However, the present invention is not limited thereto, and the negative electrode tab 34 may be made of other materials.
- the negative electrode tab 34 may be attached to the negative electrode 24 by various methods such as ultrasonic wave, resistance, or laser welding.
- the negative electrode tab 34 is connected to the negative electrode central uncoated portion 24c, thereby reducing the moving distance of the current due to the electrochemical reaction. Accordingly, it is possible to improve high rate discharge characteristics and to minimize heat generation that may occur due to the movement of current.
- the center line L2 passing through the center in the longitudinal direction of the negative electrode 24 is located at the negative electrode central uncoated portion 24c, and the negative electrode tab 34 connected to the negative electrode central uncoated portion 24c is It is preferable to be connected to the cathode 24 by satisfying the following expression (2).
- A2 is the length of the cathode 24 and B2 is the distance between one end 24d in the longitudinal direction of the cathode 24 and the center of the cathode tab 34.
- the two negative electrode active material patterns 24b are preferably formed to be the same.
- forming the same does not mean that the anode active material patterns 24b are not exactly the same, and includes a case in which the anode active material patterns 24b may be determined to be substantially the same in consideration of tolerances that may occur in the manufacturing process. .
- the positive electrode tab 32 is connected to the positive electrode center uncoated portion 22c and the negative electrode tab 34 is connected to the negative electrode central uncoated portion 24c, so that current flows in both the positive electrode 22 and the negative electrode 24.
- the distance can be minimized. Accordingly, it is more advantageous to improve the high rate discharge characteristics of the lithium secondary battery and to suppress the temperature increase.
- the positive electrode tab 32 and the negative electrode tab 34 are positioned on the same side of the lithium secondary battery based on the thickness center line L3 of the lithium secondary battery. .
- the positive electrode tab 32 and the negative electrode tab 34 are formed to be spaced apart from each other in the width direction of the electrode group when viewed in a cross-sectional view of the lithium secondary battery, so that the positive electrode tab 32 and the negative electrode tab 34 are not electrically shorted.
- the present invention is not limited thereto, and the positive electrode tab and the negative electrode tab may be variously modified according to the structure of the battery, such as being positioned at different sides with respect to the thickness center line of the lithium secondary battery, which is also within the scope of the present invention. .
- FIG. 5 is a flowchart illustrating steps of a method of manufacturing a lithium secondary battery according to an embodiment of the present invention.
- an electrode manufacturing step (ST10) of manufacturing a positive electrode and a negative electrode an electrode tab attaching step (ST20) of attaching a positive electrode tab to a positive electrode and a negative electrode tab to a negative electrode, a separator
- FIGS. 6A to 6C are views illustrating a process of the electrode manufacturing step ST10 of FIG. 5, and FIG. 7 is a diagram showing a process of the electrode tab attaching step ST20 of FIG. 5. .
- an electrode 20 in which an active material pattern is formed on a current collector that is, a positive electrode (reference numeral 22 of FIG. 2) and a negative electrode (refer to FIG. 3).
- Reference numeral 24 is prepared. Since the electrode manufacturing step ST10 is substantially the same as the positive electrode and the negative electrode except for the constituent materials of the current collector and the active material, the electrode 20 will be collectively described together.
- a current collector body 20a ' is prepared.
- the collector main body 20a ' which consists of aluminum may be prepared as an example, and when the negative electrode is manufactured, the collector main body 20a' which consists of copper may be prepared as an example.
- a plurality of active material patterns 20b are formed by applying an active material to the current collector body 20a 'in the same pattern at equal intervals.
- Carbon-based materials may be used as the negative electrode active material, and lithium-based transition metal oxides may be used as the positive electrode active material.
- the present invention is not limited to a specific active material coating method, and various active material coating methods capable of forming active material patterns may be used.
- the current collector main body (reference numeral 20a 'of FIG. 6B) is the same so that two active material patterns 20b are provided in each current collector 20a. ) Is cut to form a plurality of electrodes 20 having a central uncoated portion 20c. Since the active material patterns 20b are formed in the current collector main body 20a 'in the same pattern at the same interval, the two active material patterns 20b are symmetrical with the center plain portion 20c interposed therebetween. Is formed.
- the active material patterns 20b are formed in the same manner at regular intervals, and the electrode 20 is formed by cutting the current collector main body 20a 'such that the plurality of active material patterns 20b are provided. Accordingly, it is possible to continue using the existing equipment, there is no burden of cost increase due to the replacement of the equipment and can manufacture the electrode 20 in a simple process.
- the positive electrode tab (reference numeral 32 of FIG. 2) is attached to the positive electrode (reference numeral 22 of FIG. 2) and the negative electrode tab (reference numeral 24 of FIG. 3) is attached to the positive electrode (reference numeral 24 of FIG. 3).
- Attach reference numeral 34 The electrode tab attaching step (refer to ST20 of FIG. 5, hereinafter same) is substantially the same as the positive electrode tab and the negative electrode tab except for the constituent material of the positive electrode tab and the negative electrode tab.
- the electrode tab 30 is attached to the central uncoated portion 20c positioned between the two active material patterns 20b by welding or the like.
- an electrode tab made of aluminum may be used as the positive electrode tab, and the electrode tab made of nickel, copper, or nickel plated copper may be used as the negative electrode tab.
- the positive electrode tab and the negative electrode tab may be connected while satisfying the above-described conditions of Equations 1 and 2, respectively (see FIGS. 2 and 3).
- the positive electrode reference numeral 22 of FIG. 1, hereinafter identical
- the negative electrode reference numeral 24 of FIG. 1, hereinafter identical
- a separator reference numeral 12 of FIG. 1
- the positive electrode tab (reference numeral 32 of FIG. 1, hereinafter same) and the negative electrode tab (reference numeral 34 of FIG. 1, hereinafter identical) are not shorted to each other.
- the positive electrode tab 32 and the negative electrode tab 34 of the lithium secondary battery are positioned on the same side with respect to the thickness centerline of the lithium secondary battery, and the positive electrode tab 32 and the negative electrode tab 34 are formed. ) May be spaced apart from each other in the width direction of the lithium secondary battery.
- the positions of the positive electrode tab 32 and the negative electrode tab 34 after the winding are calculated in advance to form the positive electrode tab 32 and the negative electrode tab 34 at appropriate positions, and then the positive electrode 22 and the negative electrode 24 are formed.
- the method of winding up can be used.
- the electrode group 10 can be inserted into a case (not shown) and sealed to complete the manufacture of the battery.
- a slurry was prepared by mixing LiCoO 2 as a positive electrode active material, polyvinylidene pullulite (PVDF) as a binder, and carbon black as a conductive agent, and then mixing N-methylpyrrolidone (NMP) thereto.
- PVDF polyvinylidene pullulite
- NMP N-methylpyrrolidone
- a plurality of slurry was applied to one surface of the positive electrode current collector body made of aluminum foil at regular intervals, and the slurry was applied to the other surface at regular intervals to form a plurality of positive electrode active material patterns.
- the N-methylallyrrolidone was dried to complete volatilization and then roll pressed.
- the positive electrode current collector body was cut to form a positive electrode having two positive electrode active material patterns each formed therebetween, and a positive electrode center uncoated portion was formed between the positive electrode active material patterns.
- a positive electrode tab made of aluminum was attached to the positive electrode central uncoated portion by laser welding.
- Natural graphite as a negative electrode active material, styrene butadiene rubber (SBR) and carboxymethyl cellulose (CMC) as a binder, and then mixed with water to prepare a slurry.
- SBR styrene butadiene rubber
- CMC carboxymethyl cellulose
- a plurality of slurries were applied to one surface of the negative electrode current collector body made of copper foil at regular intervals, and the slurry was applied to the other surface at regular intervals to form a plurality of negative electrode active material patterns.
- the solvent, water, was dried to completely volatilize and roll rolled.
- the negative electrode current collector main body was cut to form a negative electrode having two negative electrode active material patterns, each having a negative electrode central uncoated portion between the negative electrode active material patterns.
- the negative electrode tab in which nickel was plated on the copper surface was attached to the negative electrode central plain part by laser welding.
- the positive electrode with the positive electrode tab and the negative electrode with the negative electrode tab were wound around the separator, inserted into a pouch-type case, and an electrolyte was injected to prepare a battery.
- an electrolyte solution a liquid electrolyte solution in which LiPF 6 was added to a mixed solution of ethylene carbonate and diethylene carbonate was used.
- a slurry was prepared by mixing LiCoO 2 as a positive electrode active material, polyvinylidene pullulite as a binder, and carbon black as a conductive agent, and then mixing N-methylpyrrolidone thereto.
- the slurry was applied to both sides of the positive electrode current collector body made of aluminum foil, and then dried to completely volatilize N-methylpyrrolidone, and then roll-pressed.
- the positive electrode current collector main body was cut so that the positive electrode active material patterns were each provided on the positive electrode.
- a positive electrode tab made of aluminum was attached to one end of the positive electrode current collector by laser welding.
- Natural graphite as a negative electrode active material, styrene butadiene rubber and carboxymethyl cellulose as a binder, and then mixed with water to prepare a slurry.
- a slurry was applied to both surfaces of the negative electrode current collector body made of copper foil to form a plurality of negative electrode active material patterns.
- the solvent, water, was dried to completely volatilize and roll rolled.
- the negative electrode current collector body was cut so that each of the negative electrode active material patterns was provided on the negative electrode.
- a negative electrode tab plated with nickel on a copper surface was attached by laser welding.
- the positive electrode with the positive electrode tab and the negative electrode with the negative electrode tab were wound around the separator, inserted into a pouch-type case, and an electrolyte was injected to prepare a battery.
- an electrolyte solution a liquid electrolyte solution in which LiPF 6 was added to a mixed solution of ethylene carbonate and diethylene carbonate was used.
- the battery voltage according to the discharge capacity was measured and shown in FIG. 8.
- the discharge capacity of the lithium secondary battery according to the experimental example is about 96%, whereas the discharge capacity of the lithium secondary battery according to the comparative example is only about 70%. Can be.
- the discharge rate is 25 CmA, it can be seen that the discharge capacity of the lithium secondary battery according to the experimental example reaches approximately 92%, while the discharge capacity of the lithium secondary battery according to the comparative example does not reach 40%.
- the lithium secondary battery according to the experimental example has a very excellent discharge capacity as compared to the lithium secondary battery according to the comparative example, and it can be seen that this difference is greater at high rate discharge.
- the discharge capacity according to the discharge rate was measured and shown in FIG. 10. Referring to Figure 10, it can be seen that the high rate discharge characteristics of the lithium secondary battery according to the experimental example is superior to the lithium secondary battery according to the comparative example.
- the discharge capacity of the lithium secondary battery according to the experimental example is almost 100%, whereas the discharge capacity of the lithium secondary battery according to the comparative example is about 90%.
- the discharge capacity of the lithium secondary battery according to the experimental example was about 96%, whereas the lithium secondary battery according to the comparative example had only about 70% discharge capacity. From these results, it can be seen that the comparative example has a sharp drop in discharge capacity at high rate discharge, whereas the lithium secondary battery according to the experimental example has excellent discharge capacity even at high rate discharge.
- the lithium secondary battery according to the comparative example is shown to have a low temperature increase at a discharge rate exceeding 20 CmA, since the current flow time becomes very short as the discharge rate increases. It's just what appears.
- the discharge time exceeds 20 CmA, and since the operating time of the actual battery is very short, the increase in the temperature of the battery is shown to be small. In this case, the battery temperature will increase rapidly.
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Abstract
Description
Claims (14)
- 제1 집전체, 및 상기 제1 집전체에 형성되며 제1 중앙 무지부를 사이에 두고 대칭 형성되는 제1 활물질 패턴들을 구비하는 제1 전극;제2 집전체, 및 상기 제2 집전체에 형성되며 제2 중앙 무지부를 사이에 두고 대칭 형성되는 제2 활물질 패턴들을 구비하는 제2 전극;상기 제1 중앙 무지부에 접속되는 제1 전극 탭; 및상기 제2 중앙 무지부에 접속되는 제2 전극 탭을 포함하는 리튬 이차 전지.
- 제1항에 있어서,상기 제1 전극의 길이 방향에서의 중심을 지나는 중심선이 상기 제1 중앙 무지부에 위치하고,상기 제2 전극의 길이 방향에서의 중심을 지나는 중심선이 상기 제2 중앙 무지부에 위치하는 리튬 이차 전지.
- 제1항에 있어서,상기 제1 전극의 길이를 A1, 상기 제1 전극의 길이 방향에서의 일 단부와 상기 제1 전극 탭의 중심 사이의 거리를 B1이라 할 때, 상기 A1 및 상기 B1이 다음의 조건을 만족하는 리튬 이차 전지.0.4 < B1/A1 < 0.6
- 제1항에 있어서,상기 제2 전극의 길이를 A2, 상기 제2 전극의 길이 방향에서의 일 단부와 상기 제2 전극 탭의 중심 사이의 거리를 B2이라 할 때, 상기 A2 및 상기 B2가 다음의 조건을 만족하는 리튬 이차 전지.0.4 < B2/A2 < 0.6
- 제1항에 있어서,상기 제1 활물질 패턴들이 두 개 구비되며 이들이 서로 동일하게 형성되고,상기 제2 활물질 패턴들이 두 개 구비되며 이들이 서로 동일하게 형성되는 리튬 이차 전지.
- 제1항에 있어서,상기 제1 전극과 상기 제2 전극이 세퍼레이터를 사이에 두고 함께 권취되며,상기 리튬 이차 전지의 횡단면으로 볼 때, 상기 제1 전극 탭과 상기 제2 전극 탭이 상기 리튬 이차 전지의 두께 중심선을 기준으로 동일한 쪽에 위치하는 리튬 이차 전지.
- 제1항에 있어서,상기 제1 전극과 상기 제2 전극이 세퍼레이터를 사이에 두고 함께 권취되며,상기 리튬 이차 전지의 횡단면으로 볼 때, 상기 제1 전극 탭과 상기 제2 전극 탭이 상기 리튬 이차 전지의 너비 방향으로 서로 이격되어 형성되는 리튬 이차 전지.
- 제1 전극 및 제2 전극을 제조하는 전극 제조 단계; 및 상기 제1 전극에 제1 전극 탭을 부착하고 상기 제2 전극에 제2 전극 탭을 부착하는 전극 탭 부착 단계를 포함하는 리튬 이차 전지의 제조 방법에 있어서,상기 전극 제조 단계는,집전체 본체를 준비하는 단계;상기 집전체 본체에 간격을 두고 서로 동일하게 활물질을 도포하여 복수의 활물질 패턴들을 형성하는 단계; 및상기 활물질 패턴들이 복수로 구비되도록 상기 집전체 본체를 절단하여 상기 활물질 패턴들 사이에 중앙 무지부가 형성된 복수의 전극을 형성하는 단계를 포함하는 리튬 이차 전지의 제조 방법.
- 제8항에 있어서,상기 전극 탭 부착 단계에서는, 상기 제1 전극 탭을 상기 제1 전극의 중앙 무지부에 부착하고 상기 제2 전극 탭을 상기 제2 전극의 중앙 무지부에 부착하는 리튬 이차 전지의 제조 방법.
- 제8항에 있어서,상기 제1 전극의 길이를 A1, 상기 제1 전극의 길이 방향에서의 일 단부와 상기 제1 전극 탭의 중심 사이의 거리를 B1라 할 때, 상기 A1 및 상기 B1가 다음의 조건을 만족하는 리튬 이차 전지의 제조 방법.0.4 < B1/A1 < 0.6
- 제8항에 있어서,상기 제2 전극의 길이를 A2, 상기 제2 전극의 길이 방향에서의 일 단부와 상기 제2 전극 탭의 중심 사이의 거리를 B2이라 할 때, 상기 A2 및 상기 B2이 다음의 조건을 만족하는 리튬 이차 전지의 제조 방법.0.4 < B2/A2 < 0.6
- 제8항에 있어서,상기 전극 탭 부착 단계 이후에, 세퍼레이터를 사이에 두고 상기 제1 전극과 상기 제2 전극을 권취하는 단계를 더 포함하는 리튬 이차 전지의 제조 방법.
- 제8항에 있어서,상기 리튬 이차 전지의 횡단면으로 볼 때, 상기 제1 전극 탭과 상기 제2 전극 탭이 상기 리튬 이차 전지의 두께 중심선을 기준으로 동일한 쪽에 위치하는 리튬 이차 전지의 제조 방법.
- 제8항에 있어서,상기 리튬 이차 전지의 횡단면으로 볼 때, 상기 제1 전극 탭과 상기 제2 전극 탭이 상기 리튬 이차 전지의 너비 방향으로 서로 이격되어 형성되는 리튬 이차 전지의 제조 방법.
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EP09708721A EP2249425A4 (en) | 2008-02-05 | 2009-01-23 | LITHIUM SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME |
US12/865,798 US20110104539A1 (en) | 2008-02-05 | 2009-01-23 | Lithium secondary battery and manufacturing method for same |
JP2010544883A JP2011511412A (ja) | 2008-02-05 | 2009-01-23 | リチウム二次電池及びその製造方法 |
CN2009801042174A CN101939873A (zh) | 2008-02-05 | 2009-01-23 | 锂二次电池及其制造方法 |
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CN102082288A (zh) * | 2009-11-30 | 2011-06-01 | 比亚迪股份有限公司 | 一种锂离子二次电池及其制造方法 |
CN103081205A (zh) * | 2010-08-27 | 2013-05-01 | 株式会社Lg化学 | 线缆型二次电池 |
CN102487150A (zh) * | 2010-12-03 | 2012-06-06 | 比亚迪股份有限公司 | 电池电芯的卷绕方法及装置 |
Also Published As
Publication number | Publication date |
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EP2249425A2 (en) | 2010-11-10 |
KR101192056B1 (ko) | 2012-10-17 |
EP2249425A4 (en) | 2012-12-05 |
KR20090085966A (ko) | 2009-08-10 |
US20110104539A1 (en) | 2011-05-05 |
WO2009099279A3 (ko) | 2009-10-29 |
CN101939873A (zh) | 2011-01-05 |
JP2011511412A (ja) | 2011-04-07 |
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