WO2010023869A1 - 二次電池の製造方法及び二次電池 - Google Patents
二次電池の製造方法及び二次電池 Download PDFInfo
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- WO2010023869A1 WO2010023869A1 PCT/JP2009/004070 JP2009004070W WO2010023869A1 WO 2010023869 A1 WO2010023869 A1 WO 2010023869A1 JP 2009004070 W JP2009004070 W JP 2009004070W WO 2010023869 A1 WO2010023869 A1 WO 2010023869A1
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- current collector
- plate
- collector plate
- electrode plate
- secondary battery
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
-
- 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
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49204—Contact or terminal manufacturing
- Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
- Y10T29/4921—Contact or terminal manufacturing by assembling plural parts with bonding
- Y10T29/49211—Contact or terminal manufacturing by assembling plural parts with bonding of fused material
Definitions
- the present invention relates to a method for manufacturing a secondary battery having a so-called tabless structure electrode group, a current collector plate used in the manufacturing method, and a secondary battery having a tabless structure electrode group.
- the electrode group of the tabless structure in which the end portions in the width direction of the positive electrode plate and the negative electrode plate are respectively joined to the current collector plate is suitable for large current discharge because the electrical resistance can be reduced, but the end portions of the positive electrode plate and the negative electrode plate Must be securely bonded to each current collector plate.
- FIG. 16A and 16B are diagrams showing the configuration of an electrode group having a tabless structure described in Patent Document 1.
- FIG. 16A is a cross-sectional view of the current collector plate 60
- FIG. 16B is a positive electrode plate (or negative electrode plate) 61. It is sectional drawing of the state which joined the edge part of this to the current collecting plate 60.
- FIG. 16A is a cross-sectional view of the current collector plate 60
- FIG. 16B is a positive electrode plate (or negative electrode plate) 61. It is sectional drawing of the state which joined the edge part of this to the current collecting plate 60.
- a plurality of grooves 60a are formed on the surface of the current collector plate 60.
- a positive electrode plate (or negative electrode plate) 61 by inserting the edge part of the positive electrode plate (or negative electrode plate) 61 in this groove part 60a, and melting the periphery of each groove part 60a, a positive electrode plate (or negative electrode plate) The end of 61 is joined to the current collector plate 60.
- the end portion of the positive electrode plate (or negative electrode plate) 61 is welded in a state where the end portion of the positive electrode plate (or negative electrode plate) 61 is embedded in the metal that is the material of the current collector plate 60 at the junction 62 with the current collector plate 60.
- the end of the (or negative electrode plate) 61 can be reliably joined to the current collector plate 60.
- the groove 60 a must be formed in the current collector plate 60 in accordance with the arrangement of the positive electrode plate (or negative electrode plate) 61. Further, an alignment technique for inserting the end portion of the positive electrode plate (or negative electrode plate) 61 into the groove 60a is required. As a result, there is a problem that the manufacturing process becomes complicated and the manufacturing cost increases.
- Patent Document 2 describes a method in which such alignment is unnecessary and an end portion of a positive electrode plate (or a negative electrode plate) is joined to a current collector plate by a simple method.
- FIG. 17 is a cross-sectional view showing the configuration of the secondary battery described in Patent Document 2.
- the end portions 71 a and 72 a of the positive electrode plate 71 and the negative electrode plate 72 protruding in opposite directions from the separator 73 are joined to the current collector plates 70 and 74.
- the end portions 71 a and 72 a of the positive electrode plate 71 and the negative electrode plate 72 are pressed against the current collecting plates 70 and 74 to form flat portions, and the flat portions are brought into contact with the current collecting plates 70 and 74. Because it is in contact and welded, alignment is not required.
- the current collectors constituting the positive electrode plate 71 and the negative electrode plate 72 are made thin (for example, the film thickness is 20 ⁇ m or less), the mechanical strength of the thin foil itself is lowered. Even if the end portions 71a and 72a of the negative electrode plate 71 and the negative electrode plate 72 are pressed, it becomes difficult to form a flat portion that is bent uniformly.
- Patent Documents 3 and 4 describe a technique capable of joining the end of a positive electrode plate or a negative electrode plate to the current collector plate even if the current collector constituting the positive electrode plate or the negative electrode plate is thinned. ing.
- FIG. 18 is a perspective view showing the configuration of the current collector plate described in Patent Document 3.
- FIG. 18 a first convex portion 80 a and a second convex portion 80 b that protrude in opposite directions are formed on the surface of a flat plate-shaped current collector plate 80. Then, with the end portion of the positive electrode plate (or negative electrode plate) 81 in contact with the second convex portion 80b, the first convex portion 80a and the current collector are irradiated with energy. By melting a part of the main body of the plate 80 and the second convex portion 80 b, the end of the positive electrode plate (or negative electrode plate) 81 can be joined to the current collector plate 80.
- the current collector plate 80 is melted by the melted member of the current collector plate 80 by simply contacting the end of the positive electrode plate (or negative electrode plate) 80 with the second convex portion 80b of the current collector plate 80. Therefore, even if the current collector constituting the positive electrode plate (or negative electrode plate) 81 is made thin and the mechanical strength is weakened, the positive electrode plate ( Alternatively, the end of the negative electrode plate 81 can be joined to the current collector plate 80.
- FIG. 19 is a perspective view showing the configuration of the current collector described in Patent Document 4.
- the current collector plate 90 has a waveform 90 a and a groove 90 b that penetrates in the thickness direction.
- the end of the positive electrode plate (or negative electrode plate) 91 can be joined to the current collector plate 90. it can.
- the current collector plate 90 itself can be joined to the current collector plate 90 by a molten member by simply converging the end of the positive electrode plate (or negative electrode plate) 91 to the waveform 90a.
- the current collector constituting the plate (or negative electrode plate) 91 is made thin and the mechanical strength is weakened, the end of the positive electrode plate (or negative electrode plate) 91 is not applied to the current collector without applying a load. It can be joined to the current collector plate 90.
- the present invention has been made in view of such problems, and a main object thereof is to provide a secondary battery including an electrode group in which end portions of a positive electrode plate and a negative electrode plate are stably bonded to a current collector plate. is there.
- the method for manufacturing a secondary battery according to one aspect of the present invention is such that at least one of the positive electrode plate and the negative electrode plate protrudes from the porous insulating layer, and the positive electrode plate and the negative electrode plate are porous insulating layers.
- a step (a) of preparing an electrode group disposed via a step, a step (b) of preparing a current collector plate having a plurality of protrusions having apexes formed on one main surface, and a porous insulating layer The step (c) of contacting the end of the protruding electrode plate with the other main surface of the current collector plate, and melting the protruding portion by arc discharge toward the apex of the protruding portion, and melting the protruding portion
- step (b) a pair of protrusions is further formed on the other main surface of the current collector plate, and the protrusions formed on one main surface of the current collector plate are
- step (c) the end of the electrode plate is converged between the pair of protrusions and is brought into contact with the other main surface of the current collector plate. The end portion of the electrode plate converged between the pair of protrusions and the current collector plate are welded by the molten member in which the protruding portion is melted.
- the end portions of the positive electrode plate and the negative electrode plate are securely connected by melting the end portion of the electrode plate converged between the pair of protrusion portions and the protrusion portion positioned between the pair of protrusion portions. Can be joined to a current collector plate.
- the top of the protrusion acts as an antenna, and arc discharge is generated toward the top of the protrusion.
- the route through which the welding current by arc discharge flows can be reliably ensured in the protruding portion to be melted, so that only the protruding portion can be accurately melted. Accordingly, it is possible to provide a secondary battery including an electrode group in which the end portions of the positive electrode plate and the negative electrode plate are stably joined to the current collector plate without heat damage to the electrode group and the separator.
- FIG. It is the figure which showed the structure of the electrode group of the conventional tabless structure, (a) is sectional drawing of a current collecting plate, (b) is a cross section of the state which joined the edge part of the positive electrode plate (or negative electrode plate) to the current collecting plate.
- FIG. It is sectional drawing which showed the structure of the conventional secondary battery. It is the perspective view which showed the structure of the conventional current collection board. It is the perspective view which showed the structure of the conventional current collection board.
- FIG. 1 to 3 are diagrams showing a method for manufacturing a secondary battery according to an embodiment of the present invention.
- FIG. 1 is a diagram schematically illustrating the configuration of the electrode group 4, where (a) is a plan view of the positive electrode plate 1, (b) is a plan view of the negative electrode plate 2, and (c) is a perspective view of the electrode group 4.
- It is. 2A and 2B are diagrams schematically showing the configuration of the current collector plate 10.
- FIG. 2A is a perspective view of the current collector plate 10
- FIG. 2B is a cross-sectional view taken along line IIb-IIb shown in FIG. is there.
- FIGS. 3A to 3C are cross-sectional views schematically showing the process of joining the electrode group 4 to the current collector plate 10.
- the positive electrode will be described as an example when the polarity is not particularly limited.
- the positive electrode plate 1 and the negative electrode plate 2 are in a state where the end portions 1a and 2a of the positive electrode plate 1 and the negative electrode plate 2 protrude from the porous insulating layer (not shown), respectively.
- An electrode group 4 arranged via a porous insulating layer is prepared.
- the end portion 1a of the positive electrode plate 1 is an uncoated portion where the positive electrode mixture layer 1b is not formed, and the end portion 2a of the negative electrode plate 2 is the same as that shown in FIG. ), The uncoated portion where the negative electrode mixture layer 2b is not formed.
- a current collector plate 10 having a plurality of protrusions 11 having apexes on the surface (one main surface) is prepared.
- the protrusion part 11 has a vertex
- the shape in particular will not be limited.
- the protrusion part 11 which has a vertex may have a cavity part inside.
- the some protrusion part 11 which has a vertex is formed radially on one main surface of the current collecting plate 10. As shown in FIG.
- the hole 10a is provided in the center of the current collecting plate 10, after the electrode group joined to the current collecting plate 10 is stored in the battery case, the electrolyte can be easily injected from the hole 10a. it can.
- the end 1 a of the positive electrode plate 1 protruding from the porous insulating layer (not shown) is brought into contact with the other main surface of the current collector plate 10.
- the edge part 1a of the positive electrode plate 1 is converged in the vicinity of the site
- the protrusion 11 is melted by arc discharge toward the apex of the protrusion 11.
- the electrode rod 13 is brought close to the projecting portion 11 whose periphery is an inert gas atmosphere 14, and a high voltage is applied between the electrode rod 13 and the current collector plate 10, whereby the projecting portion 11 Arc discharge occurs toward the apex.
- the protrusion 11 can be melted by controlling the welding current 15.
- the arc discharge is generated toward the protruding tip in the vicinity of the electrode rod 13. Therefore, even if the position of the electrode bar 13 is slightly deviated from the protruding portion 11, the top of the protruding portion 11 acts as an antenna for arc discharge, so that arc discharge can be reliably generated toward the protruding portion 11.
- the melted melting member 12 of the projecting portion 11 having the apex flows through the center of the projecting portion 11 and covers the end 1 a of the positive electrode plate 1.
- the end portion 1 a and the current collector plate 10 can be welded at the joint portion 19.
- the protrusion 11 having the apex on one main surface of the current collector plate 10, the route through which the welding current flows by arc discharge can be reliably ensured in the protrusion to be melted. Therefore, only the protruding portion can be melted with high accuracy. Accordingly, it is possible to stably join the end portions of the positive electrode plate and the negative electrode plate to the current collector plate without causing thermal damage to the electrode group or separator under the current collector plate.
- TIG TungstensInert Gas
- FIG. 4 is a cross-sectional view schematically showing the configuration of the secondary battery in the present embodiment.
- an electrode group 4 in which the end 1 a of the positive electrode plate 1 and the end 2 a of the negative electrode plate 2 are welded to the positive current collector 10 and the negative current collector 20, respectively, by the above-described method, Contained with electrolyte.
- the positive electrode current collector plate 10 is connected to the sealing plate 7 via the positive electrode lead 6, and the negative electrode current collector plate 20 is connected to the bottom surface of the battery case 5.
- the opening of the battery case 5 is sealed by a sealing plate 7 having a gasket 8 at the periphery.
- the current collector plate 10 is usually a circular one as shown in FIG. 2 (a).
- the notch part 10b may be provided in the current collector plate 10 other than the region where the projecting part 11 is formed. Thereby, after accommodating the electrode group joined to the current collector plate 10 in the battery case, the electrolytic solution can be easily injected from the notch 10b.
- the projecting portion 11 having the apex formed on the current collector plate 10 can be formed integrally with the current collector plate 10 by pressing, forging, or the like. It can also be formed by the method shown in FIG.
- the projecting portion 11 shown in FIG. 6A is formed by cutting and raising the surface of the current collector plate 10 with a blade or the like.
- the protrusion 11 shown in FIG. 6B is formed by extrusion.
- the protrusion 11 shown in FIG. 6C is formed by fitting a metal material having a melting point lower than that of the current collector plate 10 into a through hole formed in the current collector plate 10.
- the material of the positive electrode current collector plate 10 is aluminum, an aluminum alloy, a nickel-plated steel plate, nickel, or a nickel alloy, an aluminum alloy braze, a silver braze, a nickel braze, or the like can be used as the material of the protruding portion 11.
- an aluminum alloy braze, a silver braze, a nickel braze, or the like can be used as the material of the protruding portion 11.
- copper, copper alloy, nickel-plated steel plate, nickel, nickel alloy as the material of the negative electrode current collector plate 20 phosphorous copper solder, copper solder, nickel solder or the like can be used as the material of the protruding portion 11.
- FIG. 7 is a cross-sectional view showing a method for converging the end 1a of the positive electrode plate 1 in the vicinity of the portion where the protruding portion 11 is formed.
- a pair of protrusions 21 are formed on the back surface (other main surface) of the current collector plate 10, and the protrusions formed on the surface (one main surface) of the current collector plate 10. 11 is located between the pair of protrusions 21.
- the end portion 1a of the positive electrode plate 1 is brought into contact with the current collector plate 10 configured as described above, the end portion 1a of the positive electrode plate 1 is guided by the side walls of the pair of protrusions 21 to form a pair of protrusions. Converge between 21.
- the projection 11 when the projection 11 is melted by arc discharge toward the apex of the projection 11, the projection 11 having the apex is located between the pair of projections 21.
- the end portion 1a of the positive electrode plate 1 and the current collector plate 10 converged in the meantime are welded by the melted molten member of the protruding portion 11. Thereby, the edge part 1a of the positive electrode plate 1 converged between the pair of protrusions 21 can be reliably bonded to the current collector plate 10.
- FIG. 8 is a plan view showing the configuration of such a current collector plate 10.
- the pair of protrusions 21 projecting downward in the drawing) are formed radially on the back surface of the current collector plate 10. Further, the protrusions 11 (protruding above the paper surface) are radially formed on the surface of the current collector plate 10 between the pair of protrusions 21.
- the protrusion 11 having the apex is positioned between the pair of protrusions 21, but is not necessarily limited thereto. Two or more protrusions 11 having apexes may be formed between the pair of protrusions 21. Further, the protrusion 11 and the pair of protrusions 21 are not necessarily required to have the same size and shape, and may be appropriately determined depending on a required joining mode. Further, the distance between the pair of protrusions 21 is not particularly limited. For example, there may be an interval that can restrain about 3 to 15 end portions 1a of the positive electrode plate 1.
- the “vertex” in the present invention means that the tip is sharp enough to act as an antenna during arc discharge, and does not necessarily need to be sharp, and the tip is rounded. Also included.
- FIG. 9A is cross-sectional views showing an example of a method for manufacturing the current collector plate 10 shown in FIG.
- a punch 22 for forming the protrusion 11 is disposed on the back surface of the flat current collector plate 10, and a pair of protrusions 21 are formed on the surface of the current collector plate 10.
- a punch 23 is arranged. Then, by pressing the punch 22 and the pair of punches 23 in the direction of the arrows in the drawing to bend the current collector plate 10, the protruding portion 11 and the pair of pairs as shown in FIG.
- the protrusion 21 can be formed integrally with the current collector plate 10.
- FIG. 10 is a cross-sectional view showing the configuration of the current collector plate 10 in which the protrusion 11 and the pair of protrusions 21 are formed by casting. In this case, as shown in FIG. 10, unlike the case of forming by bending, no cavity is formed inside the protrusion 11 and inside the pair of protrusions 21.
- FIG. 11 is a cross-sectional view showing another method for converging the end 1a of the positive electrode plate 1 in the vicinity of the portion where the protrusion 11 is formed.
- a groove 16 for converging the end 1a of the positive electrode plate 1 is formed on the back surface of the current collector plate 10 (the surface opposite to the surface on which the protruding portions 11 are formed).
- the groove 16 forms a groove 16 for converging the end 1a of the positive electrode plate 1 by pressing a blade by pressing, or converges the end 1a of the positive electrode 1 by cutting by lathe processing. Therefore, the groove 16 can be formed.
- the end 1a of the positive electrode plate 1 can be converged by fitting into the groove 16.
- FIG. 12 is a perspective view showing a configuration of the electrode group 4 and the current collector plate 30 in which the positive electrode plate 1 and the negative electrode plate 2 are stacked with the porous insulating layer 3 interposed therebetween.
- the electrode group 4 stacked in this manner is accommodated in a rectangular battery case to constitute a rectangular secondary battery.
- the current collector plate 30 has a rectangular shape that is substantially the same as the outer shape of the battery case, and on the surface of the current collector plate 30, along the direction in which the positive electrode plate 1 and the negative electrode plate 2 are laminated, A plurality of protrusions 11 are formed.
- FIG. 13 is a perspective view showing a configuration of a flat electrode group 4 and a current collector plate 50 in which the positive electrode plate 1 and the negative electrode plate 2 are wound through the porous insulating layer 3.
- the flat electrode group 4 wound in this manner is accommodated in a rectangular battery case to constitute a rectangular secondary battery.
- the current collector plate 50 has an elliptical shape, and a plurality of protrusions 11 are formed on the surface of the current collector plate 50 along the long direction and / or the short direction.
- FIG. 14 is a plan view showing the arrangement of the protrusions 11 formed on the current collector plate.
- FIG. 14A is joined to the wound cylindrical electrode group 4 (see FIG. 1C).
- the current collector plate 10, (b) is joined to the stacked electrode group 4 (see FIG. 12), and the current collector plate 30, (c) is joined to the electrode group 4 wound in a flat shape.
- sequence of the protrusion part 11 each formed in the board 50 is shown.
- the protrusions 11 are preferably formed radially.
- the end portion 1 a of the positive electrode plate 1 is substantially orthogonal to all the protruding portions 11. Therefore, by melting the protrusion 11, the end 1 a of the positive electrode plate 1 can be reliably joined to the current collector plate 10.
- the protrusion 11 is formed along the stacking direction of the positive electrode plate 1 and the negative electrode plate 2. Is preferred. In this case, since the end portion 1a of the positive electrode plate 1 is substantially orthogonal to all the protruding portions 11, the end portion 1a of the positive electrode plate 1 is reliably bonded to the current collector plate 10 by melting the protruding portions 11. be able to.
- the protruding portion 11 is formed along the long direction and the short direction. Is preferred. In this case, since the end portion 1a of the positive electrode plate 1 is substantially orthogonal to all the protruding portions 11, the end portion 1a of the positive electrode plate 1 is reliably bonded to the current collector plate 10 by melting the protruding portions 11. be able to.
- the present invention can be applied to a secondary battery, and may be applied to a lithium ion secondary battery described in Examples described later, or may be applied to a nickel hydride storage battery. Examples in which the present invention is applied to a lithium ion secondary battery will be described below.
- Example 1 (1) Production of positive electrode plate First, 85 parts by weight of lithium cobaltate powder is prepared as a positive electrode active material, 10 parts by weight of carbon powder is prepared as a conductive material, and 5 polyvinylidene fluoride (PVdF) is used as a binder. A weight part was prepared. And the prepared positive electrode active material, the electrically conductive material, and the binder were mixed, and the positive electrode mixture coating material was produced.
- PVdF polyvinylidene fluoride
- the positive electrode mixture paint was applied to both surfaces of a positive electrode current collector made of aluminum foil having a thickness of 15 ⁇ m and a width of 56 mm, and the positive electrode mixture paint was dried. Thereafter, the positive electrode mixture layer 1b coated with the positive electrode mixture paint was rolled to produce a positive electrode plate 1 having a thickness of 150 ⁇ m. At this time, the width of the positive electrode mixture layer 1b was 50 mm, and the width of the uncoated portion 1a of the positive electrode mixture was 6 mm.
- the negative electrode mixture paint was applied to both sides of a copper foil negative electrode collector having a thickness of 10 ⁇ m and a width of 57 mm, and the negative electrode mixture paint was dried. Thereafter, the negative electrode mixture layer 2b coated with the negative electrode mixture paint was rolled to produce a negative electrode plate 2 having a thickness of 160 ⁇ m. At this time, the width of the negative electrode mixture layer 2b was 52 mm, and the width of the uncoated portion 2a of the negative electrode mixture was 5 mm.
- this aluminum plate was punched out with a press to form a hole 10a having a diameter of 7 mm in the center of the disk.
- the diameter of the aluminum plate was 30 mm. Thereby, the positive electrode current collector plate 10 was produced.
- the TIG welding conditions were such that when the positive electrode current collector plate 10 was joined, the current value was 150 A and the welding time was 50 ms.
- the current value was 100 A and the welding time was 50 ms.
- ethylene carbonate and ethyl methyl carbonate are prepared by mixing at a volume ratio of 1: 1, and dissolved in a solute of lithium hexafluorophosphate (LiPF 6 ) in this non-aqueous solvent.
- LiPF 6 lithium hexafluorophosphate
- Example 2 (1) Production of positive electrode plate First, 85 parts by weight of lithium cobaltate powder is prepared as a positive electrode active material, 10 parts by weight of carbon powder is prepared as a conductive material, and 5 weights of polyvinylidene fluoride (PVdF) is used as a binder. A part was prepared. And the prepared positive electrode active material, the electrically conductive material, and the binder were mixed, and the positive electrode mixture coating material was produced.
- PVdF polyvinylidene fluoride
- the positive electrode mixture paint was applied to both surfaces of a positive electrode current collector made of aluminum foil having a thickness of 15 ⁇ m and a width of 83 mm. After drying the positive electrode mixture paint, the positive electrode mixture layer 1b was rolled to produce a positive electrode plate 1 having a thickness of 83 ⁇ m. At this time, the width of the positive electrode mixture layer 1b was 77 mm, and the width of the uncoated portion 1a of the positive electrode mixture was 6 mm.
- the negative electrode mixture paint was applied to both surfaces of a negative electrode current collector of copper foil having a thickness of 10 ⁇ m and a width of 85 mm. After drying of the negative electrode mixture paint, the negative electrode mixture layer 2b was rolled to obtain a thickness of A negative electrode plate 2 having a thickness of 100 ⁇ m was produced. At this time, the width of the negative electrode mixture layer was 80 mm, and the width of the uncoated portion 2a of the negative electrode mixture was 5 mm.
- the separator 3 was disposed between the positive electrode plate 1 and the negative electrode plate 2. Then, the positive electrode plate 1, the negative electrode plate 2, and the separator 3 were laminated
- a negative electrode current collector plate 20 made of a copper plate having a thickness of 0.6 mm was produced.
- the current value is 150 A
- the welding time is 50 ms
- the current value is 100 A
- the welding time was 50 ms.
- the negative electrode current collector plate 20 was resistance-welded to a flat plate to be the bottom plate 9 of the battery case 5 and accommodated in the battery case 5. Thereafter, the bottom plate 9 was laser welded to the battery case 5 to seal the bottom of the battery case 5. Similarly, the positive electrode current collector plate 10 was laser welded to the sealing plate 7, and the positive electrode lead 6 was folded and accommodated in the battery case 5.
- the sealing plate 7 was laser welded to the battery case 5, and the sealing plate 7 was attached to the upper opening of the battery case 5. At this time, a liquid injection hole was formed in the sealing plate 7, but the liquid injection hole was not sealed.
- non-aqueous solvent ethylene carbonate and ethyl methyl carbonate were mixed at a volume ratio of 1: 1. Then, the non-aqueous solvent, by dissolving lithium hexafluorophosphate (LiPF 6), to prepare a nonaqueous electrolyte.
- LiPF 6 lithium hexafluorophosphate
- a nonaqueous electrolyte was injected into the battery case 5 from the liquid injection hole, and then the liquid injection hole was sealed.
- a prismatic lithium ion secondary battery (sample 2) having a thickness of 10 mm, a width of 58 mm, and a height of 100 mm was produced.
- the battery capacity of Sample 2 at this time was 2600 mAh.
- Comparative Example 1 a lithium ion secondary battery shown in FIG. 17 was produced.
- a positive electrode plate 71 and a negative electrode plate 72 having the same specifications as in Example 1 were wound through a separator 73 to produce an electrode group. Then, the edge part (uncoated part) 71a of the positive electrode plate 71 and the edge part 72a (uncoated part) of the negative electrode plate 72 were each pressed in the winding axis direction, and the flat surface was formed.
- the flat surface formed at the end 71a of the positive electrode plate 71 is brought into contact with the positive electrode current collector plate 70 made of aluminum and having a thickness of 0.5 mm and a diameter of 24 mm, and the flat surface is collected by TIG welding. Welded to plate 70.
- the flat surface formed at the end portion 72a of the negative electrode plate 72 is brought into contact with a negative electrode current collector plate 74 made of copper having a thickness of 0.3 mm and a diameter of 24 mm, and the flat surface is then collected by TIG welding. Welded to the electric plate 74.
- Example 3 A cylindrical lithium ion secondary battery (sample 3) was produced in the same manner as in Example 1 using the current collecting structure produced by the above method.
- Comparative Example 2 In Comparative Example 2, a lithium ion secondary battery shown in FIG. 19 was produced.
- an aluminum plate having a thickness of 0.5 mm, a width of 8 mm, and a length of 55 mm is pressed to form a substantially V-shaped crest 90a having a height of 1 mm and an angle of 120 ° with each other by 2 mm. Were formed in parallel with each other on the surface of the aluminum plate.
- a positive electrode current collector plate 90 having a groove portion 90b was prepared by cutting out a part in the width direction.
- a negative electrode current collector plate made of a copper plate having a thickness of 0.3 mm was produced.
- Example 4 Using the positive electrode current collector plate 90 and the negative electrode current collector plate produced by the above method, a square lithium ion secondary battery (sample 4) was produced in the same manner as in Example 2.
- the tensile strength was 50 N or more.
- the tensile strength was 10 N or less, and the joint portion was broken.
- the tensile strength was 10 N or less, and the joint was broken.
- the average output current (I) was calculated from the measured internal resistance (R) of each sample.
- R resistance
- I (current) V (voltage)
- the present invention has been described with reference to an embodiment, such a description is not a limitation and, of course, various modifications are possible.
- the example in which the electrode group of the prismatic lithium ion secondary battery is housed in a prismatic battery case having a laminated structure and opened on both sides has been described, but the electrode group wound in a flat shape or a folded shape A group of electrodes stacked on each other may be used.
- a lithium ion secondary battery may be manufactured by housing the electrode group in a flat bottomed battery case having an opening only on one side.
- a secondary battery having a current collecting structure suitable for large current discharge for example, a driving power source for a power tool or an electric vehicle that requires high output, a large-capacity backup power source, It can be applied to a power source for power storage.
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Abstract
Description
(実施例1)
(1)正極板の作製
まず、正極活物質として、コバルト酸リチウム粉末を85重量部用意し、導電材として、炭素粉末を10重量部用意し、結着材としてポリフッ化ビニリデン(PVdF)を5重量部用意した。そして、用意した正極活物質、導電材および結着材を混合して、正極合剤塗料を作製した。
まず、負極活物質として、人造黒鉛粉末を95重量部用意し、結着材としてPVdFを5重量部用意した。そして、負極活物質および結着材を混合して、負極合剤塗料を作製した。
正極合剤層1bと負極合剤層2bとの間に、幅が53mm、厚みが25μmのポリプロピレン樹脂製の微多孔フイルムよりなるセパレータ3を挟んだ。その後、正極板1、負極板2およびセパレータ3を渦巻状に巻回して電極群4を作製した。
厚みが0.8mmであるアルミニウム板をプレス加工した。これにより、アルミニウム板を円盤状に成形するとともに、高さが0.5mm、中心角が60°の断面略V字状の突出部11を、アルミニウム板の径方向において、互いに3mm間隔を開けて形成した。
電極群4の端面に、正極集電板10及び負極集電板20をそれぞれ当接させ、TIG溶接により、正極板1の端部(未塗工部)1aを正極集電板10に溶接させ、負極板2の端部(未塗工部)2aを負極集電板20に溶接させた。これにより、集電構造を作製した。
上記のように作製した集電構造を、片側のみ開口した円筒形の電池ケース5に挿入した。その後、負極集電板20を電池ケース5に抵抗溶接した後、絶縁板を間に配して、アルミニウム製の正極リード6を介して正極集電板10と封口板7とを電池ケース5にレーザ溶接した。
(実施例2)
(1)正極板の作製
まず、正極活物質として、コバルト酸リチウム粉末を85重量部用意し、導電材として炭素粉末を10重量部用意し、結着材としてポリフッ化ビニリデン(PVdF)を5重量部用意した。そして、用意した正極活物質と導電材と結着材とを混合させて、正極合剤塗料を作製した。
まず、負極活物質として、人造黒鉛粉末を95重量部用意し、結着材としてPVdFを5重量部用意した。そして、用意した負極活物質および結着材を混合し、負極合剤塗料を作製した。
幅が81mm、厚みが25μmのポリプロピレン樹脂製微多孔フイルムを用意し、セパレータ3とした。そして、そのセパレータ3を、正極板1と負極板2との間に配置した。その後、正極板1、負極板2およびセパレータ3を積層して、電極群4を作製した。
厚みが0.8mm、幅が8mm、長さが55mmのアルミニウム板を、プレス加工し、これにより、高さが0.5mm、中心角の角度が60°である断面略V字状の突出部11を、アルミニウム板の面上に形成した。このようにして、正極集電板10を作製した。
電極群4の端面に、正極集電板10及び負極集電板20をそれぞれ当接させ、TIG溶接により、正極板1の端部(未塗工部)1aを正極集電板10に溶接させ、負極板2の端部(未塗工部)2aを負極集電板20に溶接させた。これにより、集電構造を作製した。
両側が開口した角形の電池ケースを用意した。そして、図15に示すように、正極集電板10及び負極集電板20をそれぞれ開口から突出させた状態で、作製した集電構造を電池ケース5内に配置した。
比較例1では、図17に記載のリチウムイオン二次電池を作製した。
比較例2では、図19に記載のリチウムイオン二次電池を作製した。
作製したリチウムイオン二次電池の電池ケースから電極群を取り出して、接合部を視認により観察した。観察した結果を表1に示す。
先ほどと同じく作製したリチウムイオン二次電池の電池ケースから電極群を取り出して、電極板を視認により観察した。観察した結果を表1に示す。
各サンプルから5個ずつ抜き取って、JIS Z2241に基づいて接合部における引張強度を測定した。具体的には、引っ張り試験機の一方に電極群を保持させ、引っ張り試験機の他方に集電板を保持させた状態で、一定の速度で引っ張り試験機の軸方向(電極群と集電端子板とが互いに離れる方向)に双方を引っ張り、接合部が破壊したときの荷重を引張強度とした。その測定結果を表1に示す。
各サンプルに対して、内部抵抗を測定した。具体的には、まず、各サンプルに対して、1250mAの定電流で4.2Vまで充電した後、1250mAの定電流で3.0Vまで放電する充放電サイクルを3回繰り返した。次に、1kHzの交流を印加して、二次電池の内部抵抗を測定した。その測定結果を表1に示す。
1a 正極板の端部(未塗工部)
1b 正極合剤層
2 負極板
2a 負極板の端部(未塗工部)
2b 負極合剤層
3 セパレータ(多孔質絶縁層)
4 電極群
5 電池ケース
6 正極リード
7 封口板
8 ガスケット
9 底板
10 正極集電板
10a 孔
10b 切欠き部
11 突出部
12 溶融部材
13 電極棒
15 溶接電流
16 溝
19 接合部
20 負極集電板
21 突起部
22、23 パンチ
30、50 集電板
Claims (14)
- 正極板及び負極板が多孔質絶縁層を介して配置された電極群を備えた二次電池の製造方法であって、
前記正極板及び負極板の少なくとも一方の極板の端部が、前記多孔質絶縁層から突出した状態で、前記正極板及び負極板が前記多孔質絶縁層を介して配置された電極群を準備する工程(a)と、
一の主面に、頂点を有する突出部が複数形成された集電板を準備する工程(b)と、
前記多孔質絶縁層から突出した前記極板の端部を、前記集電板の他の主面に当接する工程(c)と、
前記突出部の頂点に向けてアーク放電することによって前記突出部を溶融させ、該突出部の溶融した溶融部材により、前記極板端部と前記集電板とを溶接する工程(d)と
を含む、二次電池の製造方法。 - 前記工程(b)で準備される前記集電板は、該集電板の他の主面に、一対の突起部がさらに形成されており、前記集電板の一の主面に形成された前記突出部は、前記一対の突起部の間に位置しており、
前記工程(c)において、前記極板の端部は、前記一対の突起部間に収束されて前記集電板の他の主面に当接され、
前記工程(d)において、前記一対の突起部間に収束された前記極板の端部と前記集電板とが、前記突出部の溶融した溶融部材により溶接される、請求項1に記載の二次電池の製造方法。 - 前記工程(b)で準備される前記集電板において、前記突出部は、円錐形状または角錐形状をなしている、請求項1に記載の二次電池の製造方法。
- 前記工程(b)で準備される前記集電板において、前記複数の突出部は、前記集電板の一の主面上を、放射状に形成されている、請求項1に記載の二次電池の製造方法。
- 前記工程(b)で準備される前記集電板において、前記突出部は、平板からなる前記集電板をプレス加工することによって、該集電板と一体的に形成されている、請求項1に記載の二次電池の製造方法。
- 前記工程(b)で準備される前記集電板において、前記突出部及び前記一対の突起部は、平板からなる前記集電板をプレス加工することによって、該集電板と一体的に形成されている、請求項2に記載の二次電池の製造方法。
- 前記工程(b)で準備される前記集電板において、前記突出部は、その内側に空洞部を有している、請求項1に記載の二次電池の製造方法。
- 前記工程(b)で準備される前記集電板において、前記突出部は、前記集電板の材料よりも融点の低い金属材料からなる、請求項1に記載の二次電池の製造方法。
- 前記工程(a)で準備される前記電極群において、正極板及び負極板の少なくとも一方の極板の端部は、合剤層が形成されていない未塗工部である、請求項1に記載の二次電池の製造方法。
- 請求項1~9の何れかに記載の二次電池の製造方法に使用される集電板であって、
前記集電板の一の主面に、頂点を有する突出部が複数形成されている、集電板。 - 前記集電板の他の主面に、一対の突起部がさらに形成されており、
前記突出部は、前記一対の突起部の間に形成されている、請求項10に記載の集電板。 - 前記突出部は、円錐形状または角錐形状をなしている、請求項10に記載の集電板。
- 請求項1~9の何れかに記載の方法により製造された二次電池であって、
正極板及び負極板の少なくとも一方の極板の端部が、多孔質絶縁層から突出し、該突出した極板の端部が、集電板の他の主面に当接した状態で、該集電板に溶接されており、
前記極板の端部は、前記集電板の一の主面に形成された頂点を有する突出部が、該頂点に向けてなされたアーク放電により溶融した溶融部材により、前記集電板に溶接されている、二次電池。 - 前記集電板の他の主面に、一対の突起部がさらに形成されており、
前記極板の端部は、前記一対の突起部間に収束された状態で、前記一対の突起部間に形成された前記突出部が溶融した溶融部材により、前記集電板に溶接されている、請求項13に記載の二次電池。
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CN110048065A (zh) * | 2018-01-17 | 2019-07-23 | 三洋电机株式会社 | 二次电池及其制造方法 |
CN110048065B (zh) * | 2018-01-17 | 2022-12-02 | 三洋电机株式会社 | 二次电池及其制造方法 |
CN115090985A (zh) * | 2022-03-24 | 2022-09-23 | 东莞锂威能源科技有限公司 | 一种聚合物锂电池组制造方法及其设备 |
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CN102124592A (zh) | 2011-07-13 |
KR20110042039A (ko) | 2011-04-22 |
US20110086258A1 (en) | 2011-04-14 |
JP5137918B2 (ja) | 2013-02-06 |
JP2010108916A (ja) | 2010-05-13 |
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