WO2011036960A1 - リチウムイオン2次電池 - Google Patents
リチウムイオン2次電池 Download PDFInfo
- Publication number
- WO2011036960A1 WO2011036960A1 PCT/JP2010/063649 JP2010063649W WO2011036960A1 WO 2011036960 A1 WO2011036960 A1 WO 2011036960A1 JP 2010063649 W JP2010063649 W JP 2010063649W WO 2011036960 A1 WO2011036960 A1 WO 2011036960A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- winding
- negative electrode
- positive electrode
- ion secondary
- lithium ion
- Prior art date
Links
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
- 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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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 wound group structure of a lithium ion secondary battery.
- a lithium ion secondary battery mounted on a hybrid vehicle or an electric vehicle includes a winding group including a positive electrode, a negative electrode, and a separator as a power generation element, and the winding group is immersed in an electrolytic solution.
- the separator holds the electrolytic solution and prevents contact between the positive electrode and the negative electrode and a short circuit.
- the secondary battery of Patent Document 1 has a problem that the battery performance is lowered and the manufacturing cost is increased.
- a sheet-like positive electrode having a positive electrode mixture layer and a sheet-like negative electrode having a negative electrode mixture layer are wound through a separator,
- the end is arranged on the outer peripheral side of the winding group from the positive electrode, and the winding start end of the positive electrode, the winding start end of the negative electrode, the winding end end of the positive electrode, and the winding end of the negative electrode are arcs of the winding group.
- the positive electrode mixture layer is not disposed in the region of the portion, but is disposed in the region of the flat portion of the wound group.
- Negative-electrode mixture layer covering the entire surface of the positive-electrode mixture layer is disposed on the inner and outer peripheral surfaces.
- the lithium ion secondary battery according to the second aspect of the present invention is the lithium ion secondary battery according to claim 1, wherein the winding start end of the positive electrode and the winding end of the positive electrode are mutually opposite in the front and back directions of the flat portion. It is desirable that they are arranged so as not to overlap, and the winding start end of the negative electrode and the winding end of the negative electrode are arranged so as not to overlap each other in the front and back direction of the flat part.
- a lithium ion secondary battery according to a third aspect of the present invention is the lithium ion secondary battery according to claim 1 or 2, wherein the flat portion of the winding portion is separated from the central axis in the thickness direction.
- the positive electrode winding start end portion and the negative electrode winding start end portion are arranged on one inner peripheral side of the upper half flat portion and the lower half flat portion, and the positive electrode winding end end. It is desirable that the winding end ends of the upper part and the negative electrode are arranged on one outer peripheral side of the upper half flat part and the lower half flat part where the positive electrode winding start part and the negative electrode winding start end part are arranged.
- the lithium ion secondary battery according to the fourth aspect of the present invention is the lithium ion secondary battery according to any one of claims 1 to 3, wherein the winding start side portion of the innermost positive electrode in the wound group is The winding start side portion of the innermost negative electrode in the winding group is arranged so as not to overlap the winding end side portion of the outermost negative electrode. It is desirable that
- the lithium ion secondary battery according to the fifth aspect of the present invention is the lithium ion secondary battery according to any one of claims 1 to 4, wherein the winding start side portion of the innermost positive electrode in the wound group is The winding end side portion of the outermost positive electrode and the winding end side portion of the outermost negative electrode are arranged so as not to overlap with each other.
- the lithium ion secondary battery according to the sixth aspect of the present invention is a sheet-like material in which the positive electrode mixture layer is disposed on both surfaces of the metal current collector, and the positive electrode mixture layer is disposed from the winding start end to the winding end end.
- a positive electrode and a negative electrode mixture layer are arranged on both sides of the metal current collector, and the negative electrode mixture layer is interposed between the positive electrode and the negative electrode, and a sheet-like negative electrode arranged from the winding start end to the winding end end.
- a sheet layer in which sheet-like separators are overlapped is wound while being folded back in a substantially arc shape at both ends, and a winding group in which two upper and lower outer surfaces and two inner surfaces facing each outer surface are flat in the center portion.
- the negative electrode winding start end portion is disposed on the inner peripheral side of the wound group from the positive electrode, the negative electrode winding end end portion is disposed on the outer peripheral side of the wound group from the positive electrode, and the positive electrode winding start end portion, the negative electrode
- the winding start end of the positive electrode, the winding end of the positive electrode, and the winding end of the negative electrode Is disposed at a position, the winding start end portion of the negative electrode is disposed from the winding center of the winding group than the winding start end portion of the positive electrode.
- the lithium ion secondary battery according to a seventh aspect of the present invention is the lithium ion secondary battery according to claim 6, wherein the negative electrode composite covering the entire surface of the positive electrode mixture layer on the inner peripheral surface and the outer peripheral surface of the positive electrode mixture layer. It is desirable that a material layer is disposed.
- the lithium ion secondary battery according to an eighth aspect of the present invention is the lithium ion secondary battery according to claim 6 or 7, wherein the winding start end portion of the positive electrode and the winding end end portion of the positive electrode are front and back of the central portion. It is desirable that the winding start end portion of the negative electrode and the winding end end portion of the negative electrode are disposed so as not to overlap each other in the front and back direction of the central portion.
- a lithium ion secondary battery according to a ninth aspect of the present invention is the lithium ion secondary battery according to any one of claims 6 to 8, wherein the positive electrode winding start end, the negative electrode winding start end, and the positive electrode
- the winding end and the winding end of the negative electrode are preferably disposed on one of the inner surfaces at the center of the wound group and on the outer surface facing one of the inner surfaces.
- the lithium ion secondary battery according to a tenth aspect of the present invention is the lithium ion secondary battery according to any one of claims 6 to 9, wherein the winding start side portion of the innermost positive electrode in the wound group is Arranged so as not to overlap the winding end side portion of the outermost negative electrode, and arranged so that the winding start side portion of the innermost negative electrode in the winding group does not overlap the winding end side portion of the outermost front pole It is desirable that The lithium ion secondary battery according to an eleventh aspect of the present invention is the lithium ion secondary battery according to any one of claims 6 to 10, wherein the winding start side portion of the innermost positive electrode in the wound group is The winding end side portion of the outermost positive electrode and the winding end side portion of the outermost negative electrode are arranged so as not to overlap with each other. It is desirable that they are arranged so as not to overlap the end side portion and the winding end side portion of the outermost negative electrode.
- the lithium ion secondary battery of the present invention it is possible to suppress the deposition of lithium dendride on the negative electrode of the wound group that is the power generation element, thereby improving the reliability of the lithium ion secondary battery.
- Examples 7 is a table showing the specifications of positive electrodes and negative electrodes of Examples 1 to 4 and Comparative Examples 1 to 8 of lithium ion secondary batteries according to the present invention.
- a table comparing wound group specifications of Examples 1 to 4 and Comparative Examples 1 to 8. 10 is a table comparing the voltage drop amounts of Examples 1 to 4 and Comparative Examples 1 to 8.
- surface which shows the specification of the positive electrode of the Examples 5 and 6 of the lithium ion secondary battery by this invention, and Comparative Examples 9-14, and a negative electrode.
- the lithium ion secondary batteries of Examples 1 to 8 and Comparative Examples 1 to 14 are the lithium ion secondary batteries shown in FIGS. 9 to 12 except for the detailed configuration of the winding group.
- the lithium ion secondary battery targeted by this specification is, for example, a 5 Ah class battery, and the capacity ratio (negative electrode capacity / positive electrode capacity) is, for example, 1.0 to 1.2.
- the lithium ion secondary battery is configured by storing a wound group 20 as a power generation element shown in FIG. 11 in a battery can 19 while being covered with an insulating bag 18 as shown in FIG.
- the wound group 20 is configured by sequentially laminating a sheet-like separator 21, a sheet-like negative electrode 22, a sheet-like separator 23, and a sheet-like positive electrode 24. ing.
- the negative electrode 22 is cut out longer than the positive electrode 24.
- the wound group 20 is formed with arc-shaped portions having a semicircular cross section on both sides of a flat portion located in the center having a rectangular cross section. It has a flat shape. In this case, both arc-shaped portions have a semicircular shape that is line-symmetric with respect to the flat portion.
- the winding start end 22 ⁇ / b> S of the negative electrode 22 is located on the innermost peripheral side of the wound group 20.
- the winding end 22E of the negative electrode 22 is located on the outermost peripheral side of the wound group 20.
- the winding start end portion 22S of the negative electrode 22 is positioned on the inner side of the winding start end portion 24S of the positive electrode 24, and the winding end end portion 22E of the negative electrode 22 is positioned on the positive electrode 24. It is located outside the winding end 24E.
- the negative electrode 22 covers the whole positive electrode 24.
- the sheet-like separators 21 and 23 are interposed between the positive electrode 24 and the negative electrode 22, and the sheet-like separator 23 disposed on the outer peripheral surface of the negative electrode 22 constitutes the outer peripheral surface of the wound group 20.
- FIG. 11 is an external perspective view for explaining the details of the wound group 20
- FIG. 12 is an external perspective view showing a completed state of the wound group 20.
- the wound group 20 is formed by connecting an arc-shaped portion whose outer peripheral surface is an arc-shaped surface 20T and a flat portion whose outer peripheral surface is a flat surface 20P.
- the wound group 20 will be described in more detail with reference to FIG.
- the positive electrode 24 is a sheet in which the positive electrode mixture layer 5 is provided on both surfaces of a metal current collector, for example, an aluminum foil, in a solid shape from the winding start end 24S to the winding end end 24E.
- a positive electrode uncoated portion 4 to which the positive electrode mixture layer 5 is not applied is formed at one end of the aluminum foil, and is used as a positive electrode current collector.
- the negative electrode 22 is a sheet in which the negative electrode mixture layer 6 is provided on both surfaces of a metal current collector, for example, copper foil, in a solid shape from the winding start end 22S to the winding end end 22E.
- a negative electrode uncoated portion 3 to which the negative electrode mixture layer 6 is not applied is formed at one end of the copper foil, and is used as a negative electrode current collector.
- the positive electrode uncoated portion 4 to which the positive electrode mixture layer 5 is not applied and the negative electrode uncoated portion 3 to which the negative electrode mixture layer 6 is not applied are arranged on the opposite side with respect to the center in the longitudinal direction of the sheet.
- the joint portion 11 of the positive electrode current collector lead portion 9 made of aluminum is connected to the positive electrode uncoated portion 4 of the wound group 20 by ultrasonic welding, and the negative electrode uncoated portion 3 is made of copper.
- the joint 12 of the negative electrode current collector lead 10 is connected by ultrasonic welding.
- the current collecting lead portions 9 and 10 are connected to the positive electrode terminal 13 and the negative electrode terminal 14 mounted on the battery lid 17, respectively, whereby the wound group 20 is supported by the battery lid 17, and the positive electrode terminal 13 and Charging / discharging from the negative electrode terminal 14 becomes possible.
- the liquid injection port 15 is closed by laser welding after the electrolyte injection.
- the battery can 19 is sealed by welding the battery lid 17 to the battery can 19 by laser welding.
- the positive electrode mixture layers in the wound group 20 of Examples 1 to 4 and Comparative Examples 1 to 8 were prepared as follows using LiCoO 2 as the positive electrode active material. That is, a positive electrode active material, graphite as a conductive agent, and polyvinylidene fluoride as a binder were kneaded at a weight ratio of 85: 10: 5 for 30 minutes using a kneader to obtain a positive electrode mixture.
- the positive electrode mixture was coated on both sides of an aluminum foil (substrate) having a thickness of 20 ⁇ m.
- the produced positive electrode 24 and negative electrode 22 were both roll-formed with a press and then vacuum-dried at 100 ° C. for 24 hours. After drying, the positive electrode 24 and the negative electrode 22 are overlapped via the separators 21 and 23, and the winding start end 24S and the winding end end 24E of the positive electrode 24 and the winding start end 22S and the winding end end 22E of the negative electrode 22 are formed.
- the wound group 20 was produced by changing the position for each of the examples and comparative examples.
- the winding group 20 does not use an axis, and the separator is wound four times, the winding start end portion 22S of the negative electrode 22 is located on the innermost circumference of the winding group 20, and the winding end end portion 22E of the negative electrode 22 is the winding group.
- the winding start end portion 22S of the negative electrode 22 is set to the winding start end portion 24S of the positive electrode 24, and the winding end end portion 22E of the negative electrode 22 is set to 0. 0 to the winding end end portion 24E of the positive electrode 24, respectively. It was wound so as to be 5 cm to 1.0 cm long.
- the winding group 20 has an overall size of 70 mm (length) ⁇ 100 mm (axial width) ⁇ 15 mm (thickness).
- the diameter of the outermost arc-shaped surface 20T of the arc-shaped portion of the wound group 20 was 15 mm, and the flat portion was 55 mm (length) ⁇ 100 mm (axial width).
- the winding start end 24S, the winding end end 24E of the positive electrode 24, and the winding of the negative electrode 22 are shown.
- the sheet layers of the separator 21, the negative electrode 22, the separator 23, and the positive electrode 24 in FIG. 10A are placed so that all the end portions of the start end portion 22S and the winding end end portion 22E are positioned within the flat surface 20P region. Turned.
- any of the winding start end 24S and winding end 24E of the positive electrode 24 and the winding start end 22S and winding end 22E of the negative electrode 22 The laminated sheet similar to FIG. 10A was wound so that the end portion or all the end portions were not located in the flat surface 20P region but the arc-shaped portion region.
- the winding start end portion 24S of the positive electrode 24 and the winding start end portion 22S of the negative electrode 22 are in the flat surface 20P region.
- the winding end portion 24E of the positive electrode 24 and the winding end portion 22E of the negative electrode 22 are positioned not in the flat surface 20P region but in the arcuate surface 20T region.
- the winding start end 24S of the positive electrode 24 and the winding start end 22S of the negative electrode 22 are located not in the flat surface 20P region but in the arcuate surface 20T region.
- the portion 24E and the winding end portion 22E of the negative electrode 22 are located in the flat surface 20P region.
- the winding start end 24S and the winding end end 24E of the positive electrode 24 and the winding start end 22S and the winding end 22E of the negative electrode 22 are not all within the flat surface 20P region. , Located in the arcuate surface 20T region. In this case, the length of the positive electrode and the negative electrode is longer in the negative electrode as described above.
- the lithium ion secondary batteries of Examples 1 to 4 and Comparative Examples 1 to 8 were charged for 3 cycles at a charge end voltage of 4.1 V, a discharge end voltage of 2.7 V, and a charge / discharge rate of 1 C (1 hour rate of rated electrical capacity).
- the battery was discharged and stored at 25 ° C. for 20 days at a charge termination voltage of 3.7 V and a charge rate of 1 C, and the voltage drop was measured.
- FIG. 3 shows the test results.
- Comparative Examples 1 to 4 that the voltage drop in Examples 1 to 4 is smaller than the voltage drop in Comparative Examples 1 to 8.
- the position of the winding end portions 24E and 22E is not in the flat surface 20P region, and the voltage drop is 300 to 350 mV.
- Comparative Examples 5 to 6 are cases where the positions of the winding start ends 24S and 22S are not within the flat surface 20P region, and the voltage drop is 200 to 300 mV.
- Comparative Examples 7 and 8 are cases where both the winding end ends 24E and 22E and the winding start ends 24S and 22S are located not in the flat surface 20P region but in the arcuate surface 20T region. This is presumed to be due to the precipitation of lithium dendride at both ends of the electrode.
- Examples 1 to 4 can avoid such a problem. That is, the negative electrode 22 is disposed on the innermost and outermost peripheral surfaces of the wound group 20, and the winding start end 24S of the positive electrode 24, the winding start end 22S of the negative electrode 22, and the winding end of the positive electrode 24 are arranged. By arranging the portion 24E and the winding end portion 22E of the negative electrode 22 in the flat surface 20P region, precipitation of lithium dendride is reduced and internal short circuit is suppressed, so that the voltage drop mV is suppressed to 20 to 25 mV. Can do.
- the lithium ion secondary batteries of Examples 1 to 4 by preventing internal short circuit, the lithium ion secondary battery having higher safety and reliability without causing performance degradation and cost increase. A battery is provided.
- the lithium ion secondary batteries of Examples 5 and 6 shown in FIGS. 9 to 12 were produced in the same manner as the lithium ion secondary batteries of Examples 1 to 4, and the lithium ion secondary batteries were used as Comparative Examples 9 to 14. The lithium ion secondary battery was compared.
- the winding group 20 uses LiNiO 2 as the positive electrode active material and is wound in the same manner as the lithium ion secondary batteries of Examples 1 to 4.
- Group 20 was made.
- the battery capacity ratio (negative electrode capacity / positive electrode capacity) was 1.0 to 1.2.
- the main difference between the wound group 20 of Examples 5 and 6 and the wound group 20 of Examples 1 to 4 is that the former uses LiNiO 2 as the positive electrode active material and the latter uses LiCoO 2 as the positive electrode active material. And the former uses natural graphite as the negative electrode active material, and the latter uses graphite as the negative electrode active material.
- the winding end ends 24E and 22E and the winding start ends 24S and 22S are all set at the position of the flat surface 20P. is doing.
- the difference between the wound groups 20 of Examples 5 and 6 and Comparative Examples 9 to 14 is that the polarity of the electrode forming the winding start end portion at the innermost circumference of the wound group 20 and the outermost circumference of the wound group That is, the polarity of the electrode forming the winding end is positive or negative.
- the lithium ion secondary batteries of Examples 5 and 6 have the poles of the innermost sheet layer forming the winding start end of the wound group 20, It winds so that the pole of the outermost sheet layer which forms the winding end end part of winding group 20 may turn into a negative electrode.
- the winding start end portion 22S of the negative electrode 22 of the wound group 20 is positioned closer to the center of the winding group 20 than the winding start end portion 24S of the positive electrode 24 of the wound group 20.
- the winding end end portion 22E of the negative electrode 22 of the wound group 20 is located closer to the center of the winding group 20 than the winding end portion 24E of the positive electrode 24 of the wound group 20.
- the end portions 22S and 22E of the negative electrode 22 are both longer than the end portions 24S and 24E of the positive electrode 24, and the innermost and outermost surfaces of the wound group 20 are covered with the negative electrode. ing.
- the lithium ion secondary batteries of Comparative Examples 9 to 14 are configured as follows. As illustrated in the schematic diagram column of FIG. 5, in the lithium ion secondary batteries of Comparative Examples 9 and 10, the winding start end portion 22S of the negative electrode 22 is more wound than the winding start end portion 24S of the positive electrode 24. The winding end end 24E of the positive electrode 24 is arranged closer to the center than the winding end end 22E of the negative electrode 22. The pole of the innermost sheet layer on the winding start end side of the wound group 20 is the negative electrode. However, the pole of the outermost sheet layer that forms the winding end of the wound group 20 is the positive electrode.
- the winding start end 24 ⁇ / b> S of the positive electrode 24 is wound more than the winding start end 22 ⁇ / b> S of the negative electrode 22.
- the winding end end 24E of the positive electrode 24 is disposed closer to the center than the winding end end 22E of the negative electrode 22.
- the innermost circumference on the winding start end side of the winding group 20 is the positive electrode 24, and the outermost circumference forming the winding end end of the winding group 20 is also the positive electrode 24.
- the winding start end 24S of the positive electrode 24 is disposed closer to the center of the wound group 20 than the winding start end 22S of the negative electrode 22, and the winding end end of the negative electrode 22 is placed. 22E is disposed closer to the center than the winding end 24E of the positive electrode 24.
- the pole of the innermost sheet layer on the winding start end side of the winding group 20 is the positive electrode 24 and the pole of the outermost sheet layer forming the winding end end of the winding group 20 is the negative electrode 22.
- the lithium ion secondary batteries of Examples 5 and 6 and Comparative Examples 9 to 14 were charged for 3 cycles at a charge end voltage of 4.1 V, a discharge end voltage of 2.7 V, and a charge / discharge rate of 1 C (1 hour rate of the rated electric capacity).
- the battery was discharged and charged and discharged at a charge / discharge rate of 10 CA (1/10 hour rate of rated electrical capacity) at a 60 ° C. charge end voltage of 4.1 V and a discharge end voltage of 2.7 V to obtain a capacity maintenance rate. .
- FIG. 6 shows the test results.
- FIG. 6 shows that the lithium ion secondary batteries of Examples 5 and 6 have less capacity deterioration than the lithium ion secondary batteries of Comparative Examples 9-14.
- the same effects as those of Examples 1 to 4 can be achieved. That is, the negative electrode 22 exists in a sufficient range of the opposing position of the positive electrode 24 at both the winding start end and the winding end end, and the negative electrode alignment is in all of the opposing positions through the separators 21 and 23 of the positive electrode mixture layer. By disposing the material layer 4, the precipitation of lithium dendride is suppressed and the performance of the lithium ion secondary battery can be improved.
- lithium ion secondary batteries of Examples 7 and 8- Similarly to the lithium ion secondary batteries of Examples 1 to 4, lithium ion secondary batteries of Examples 7 and 8 shown in FIGS. 9 to 12 were produced.
- the wound group 20 of Examples 7 and 8 as shown in FIG. 7, LiNi 0.85 Co 0.15 Al 0.05 O 2 is used as the positive electrode active material, and natural graphite is used as the negative electrode active material. is doing.
- the battery capacity ratio (negative electrode capacity / positive electrode capacity) was 1.0 to 1.2.
- the wound group 20 produced did not use the shaft core, and the separator was wound four times to form the winding start ends 24S and 22S and the winding end ends 24E and 22E.
- the (Z, X) coordinates of the XYZ coordinate system shown in FIG. 14A are set to the (Z, X) coordinates of the XYZ coordinate system shown in FIG.
- the Z axis is the central axis in the thickness direction of the wound group 20
- the X axis is the central axis in the length direction of the wound group 20.
- the flat portion of the wound group 20 is composed of an upper half flat portion and a lower half flat portion separated by a Z axis that is a central axis in the thickness direction.
- the lithium ion secondary battery of Example 7 includes a winding start end 24S of the positive electrode 24, a winding start end 22S of the negative electrode 22, a winding end 24E of the positive electrode 24, and a positive electrode. All the winding end portions 22E of 22 are arranged in the flat surface 20P region.
- the winding start end 24S of the positive electrode 24 and the winding start end 22S of the negative electrode 22 are arranged on the innermost periphery of the upper half flat portion, and the winding end end 24E of the positive electrode 24 and the winding end end 22E of the positive electrode 22 are arranged in the upper half. It is arranged on the outermost periphery of the flat part.
- the winding end end 24E of the positive electrode 24 is located on the flat surface 20P just before reaching the position corresponding to the winding start end 24S of the positive electrode 24 and the winding start end 22S of the negative electrode 22 on the outermost periphery of the upper half flat part. ing. That is, the winding start side portion of the positive electrode 24 from the innermost peripheral end of the wound group 20 to the winding start end 24S of the positive electrode 24 is from the outermost peripheral end of the wound group 20 to the winding end end 24E of the positive electrode 24.
- the winding end side portion of the positive electrode 24 and the winding end side portion of the negative electrode 22 from the outermost peripheral end of the winding group 20 to the winding end end portion 22E are arranged so as not to overlap.
- the winding end end portion 22E of the negative electrode 22 is formed on the flat surface 20P before reaching the position corresponding to the winding start end portion 24S of the positive electrode 24 and the winding start end portion 22S of the negative electrode 22 on the outermost periphery of the upper half flat portion. positioned. That is, the winding start side portion of the negative electrode 22 from the innermost peripheral end of the wound group 20 to the winding start end portion 22S of the negative electrode 22 is from the outermost peripheral end of the wound group 20 to the winding end end portion 24E of the positive electrode 24.
- the winding end side portion of the positive electrode 24 and the winding end side portion of the negative electrode 22 from the outermost peripheral end of the winding group 20 to the winding end end portion 22E are arranged so as not to overlap.
- the outermost positive electrode 24 portion and the outermost negative electrode 22 portion in the upper half flat portion are the innermost positive electrode 24 portion and the innermost negative electrode 22 portion in the upper half flat portion, respectively. Does not have an overlapping area.
- All winding end portions 22E of the positive electrode 22 are disposed in the flat surface 20P region.
- the winding start end 24S of the positive electrode 24 and the winding start end 22S of the negative electrode 22 are arranged on the innermost periphery of the upper half flat portion, and the winding end end 24E of the positive electrode 24 and the winding end 22E of the positive electrode 22 are arranged in the upper half. It is arranged on the outermost periphery of the flat part.
- the winding end 24E of the positive electrode 24 has the winding start end 24S of the positive electrode 24 and the negative electrode on the outermost peripheral surface of the upper half flat portion. 22 is arranged at a position of the flat surface 20P beyond the position corresponding to the winding start end portion 22S. That is, the winding start side portion of the positive electrode 24 from the innermost peripheral end of the wound group 20 to the winding start end 24S of the positive electrode 24 is from the outermost peripheral end of the wound group 20 to the winding end end 24E of the positive electrode 24.
- the winding end side portion of the positive electrode 24 and the winding end side portion of the negative electrode 22 from the end of the outermost circumference of the wound group 20 to the winding end end portion 22E of the negative electrode 22 are arranged to overlap each other. Further, the winding end end portion 22E of the negative electrode 22 has a flat surface 20P beyond the position corresponding to the winding start end portion 24S of the positive electrode 24 and the winding start end portion 22S of the negative electrode 22 at the outermost periphery of the upper half flat portion. Placed in position.
- the winding start side portion of the negative electrode 22 from the innermost peripheral end of the wound group 20 to the winding start end portion 22S of the negative electrode 22 is from the outermost peripheral end of the wound group 20 to the winding end end portion 24E of the positive electrode 24.
- the winding end side portion of the positive electrode 24 and the winding end side portion of the negative electrode 22 from the outermost peripheral end of the winding group 20 to the winding end end portion 22E of the negative electrode 22 are partially overlapped.
- the winding start side tip portion of the outermost positive electrode 24 and the outermost negative electrode 22 in the upper half flat portion is the winding end side of the innermost positive electrode 24 and the innermost negative electrode 22 in the upper half flat portion. It overlaps with the tip.
- the thicknesses of the positive electrode 24, the negative electrode 22, and the separator 21 were 100 ⁇ m, 100 ⁇ m, and 40 ⁇ m, respectively.
- the unit of the (Z, X) coordinate in FIG. 8 is mm.
- (20.0.2) indicates a position of 20 mm in the Z coordinate (length direction) and 0.2 mm in the X coordinate (thickness direction).
- Example 7 and 8 shown in FIG. 8 the X coordinates of the winding start end 24S of the positive electrode 24 and the winding start end 22S of the negative electrode 22 are the same.
- the X coordinate of the winding end part 24E of the positive electrode 24 and the winding end part 22E of the negative electrode 22 is 0.3 mm larger in Example 8 than in Example 7, respectively. Since the X coordinate is the thickness of the wound group 20, Example 8 is 0.3 mm thicker than Example 7. That is, in Example 8, the thickness of three separators 21, one positive electrode 24, and one negative electrode 22 is partially increased.
- the lithium ion secondary batteries of Examples 7 and 8 were charged and discharged for 3 cycles at a charge end voltage of 4.1 V, a discharge end voltage of 2.7 V, and a charge / discharge rate of 1 C (1 hour rate of the rated electric capacity).
- the charge / discharge rate of 10 CA (1/10 hour rate of the rated electric capacity) was performed 1000 cycles at a charge end voltage of 4.1 V and a discharge end voltage of 2.7 V.
- Example 7 As a result, as shown in FIG. 8, the capacity retention rate of Example 7 was about 90%, but Example 8 was about 80%. This is because the thick part of the wound group 20 enters the battery can, the distance between the electrodes is shortened, and a part with low resistance is generated, so that current concentrates on the part and the deterioration is accelerated. It is done.
- the winding start end 22S and the winding end end 22E of the negative electrode 22 are the same. They are arranged on the (Z, X) plane or the same ( ⁇ Z, X) plane, and the X coordinate and absolute value of the Z coordinate of the winding end ends 24E and 22E are respectively set to the winding start ends 24S and 22S. It can be seen that it is preferable to set larger values of the absolute values of the X coordinate and the Z coordinate.
- the lithium ion secondary battery according to the present invention includes a winding group in which a sheet-like positive electrode and a sheet-like negative electrode are wound into a flat shape via a separator.
- the wound group is immersed in various electrolytes and stored in a battery can while being insulated.
- the battery can is provided with a positive electrode external terminal connected to the sheet-like positive electrode and a negative electrode external terminal connected to the sheet-like negative electrode, and discharges and charges through the external terminal.
- the winding start end portion and winding end end portion of the positive electrode and the negative electrode are not located at both end arc portions of the winding group, but are located closer to the center of the flat portion.
- the winding start end portion of the negative electrode is disposed on the inner peripheral side of the winding group from the positive electrode, and the winding end end portion of the negative electrode is disposed on the outer peripheral side of the winding group from the positive electrode.
- the negative electrode mixture layer is disposed at all the positions of the positive electrode mixture layer facing each other through the separator by defining the length of the negative electrode and the positive electrode in the longitudinal direction. In other words, in the wound group of lithium ion secondary batteries according to the present invention, the positive electrode is covered with the negative electrode.
- the winding start end of the positive electrode 24 and the winding start end of the negative electrode 22 are arranged on the inner peripheral side of the upper half flat portion, and the winding end of the positive electrode 24 and the winding end of the negative electrode 22 are arranged.
- the part is arranged on the outer peripheral side of the upper half flat part.
- the winding start end portion of the positive electrode 24 and the winding start end portion 22S of the negative electrode 22 are arranged on the inner peripheral side of the lower half flat portion, and the winding end end portion 24E of the positive electrode 24 and the winding end end portion 22S of the negative electrode 22 are You may arrange
- winding start end 24S of the positive electrode 24 and the start end 22S of the negative electrode 22 are arranged on the inner peripheral side of the upper half flat portion, and the winding end end 24E of the positive electrode 24 and the winding end end 22E of the negative electrode 22 are You may arrange
- the winding start end 24S of the positive electrode 24 and the winding start end 22S of the negative electrode 22 are arranged on the inner peripheral side of the lower half flat portion, and the winding end end 24E of the positive electrode 24 and the winding end 22E of the negative electrode 22 are arranged. May be arranged on the outer peripheral side of the upper half flat portion.
- the winding start side tip portion of the innermost negative electrode 22 in the wound group 20 is arranged so as not to overlap the outermost positive electrode 24 and the winding end side tip portion of the negative electrode 22. .
- the winding start side tip portion of the innermost negative electrode 22 in the winding group 20 does not overlap with the winding end side tip portion of the outermost positive electrode 24, but a part thereof does not overlap with the outermost negative electrode 22 portion. You may arrange
- the lithium ion secondary battery according to the present invention is not limited to the above embodiment, and the present invention can also be applied to a lithium ion secondary battery using the following materials.
- a lithium transition metal composite oxide can be used for the positive electrode active material.
- a part of the positive electrode active material such as lithium nickelate or lithium oxide, such as Ni or Co, may be substituted with one or more transition metals.
- the negative electrode active material natural graphite, artificial graphite, non-graphitizable carbon, graphitizable carbon, silicon and other materials capable of occluding and releasing Li can be used.
- the positive electrode mixture and the negative electrode mixture include a binder, a conductive agent, and the like in addition to the active material, but these types and amounts are not limited to the examples.
- electrolyte examples include ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate, ⁇ -butyrolactone, ⁇ -valerolactone, methyl acetate, ethyl acetate, methyl propionate, tetrahydrofuran, and 2-methyl.
- Non-aqueous solvents selected from at least one of 1,3-dioxolane, 4-methyl-1,3-dioxolane and the like include, for example, LiPF6, LiBF4, LiCIO4, LiN (C2F5SO2)
- a known electrolyte used in a battery such as an organic electrolytic solution in which at least one lithium salt selected from 2 or the like is dissolved, a solid electrolyte having lithium ion conductivity, a gel electrolyte, or a molten salt can be used.
- the separator can be a general separator such as polyethylene or polypropylene, or a separator containing or coated with an inorganic substance such as alumina or silica.
- the winding group of the lithium ion secondary battery according to the present invention is applied to all structures having a flat surface and an arc surface, and the presence or absence of the axis of the winding axis does not matter.
- the lithium ion secondary battery of the present invention can be used for all kinds of products such as UPS power supplies and mobile phones other than automobile applications.
- the lithium ion secondary battery of the present invention can be variously modified and applied within the scope of the invention.
- the sheet-like positive electrode having the positive electrode mixture layer and the negative electrode composite can be used.
- a sheet-like negative electrode having a material layer is wound through a separator, and a winding group formed into a flat shape having a flat portion and arc-shaped portions connected to both sides of the flat portion;
- the battery group is accommodated in a state where the rotating group is immersed in an electrolyte, and includes a positive electrode external terminal connected to the sheet-like positive electrode and a negative electrode external terminal connected to the sheet-like negative electrode.
- the start end portion is disposed on the inner peripheral side of the wound group from the positive electrode
- the winding end end portion of the negative electrode is disposed on the outer peripheral side of the wound group from the positive electrode
- the winding start end portion of the positive electrode and the winding start end portion of the negative electrode And the winding end of the positive electrode and the winding end of the negative
- the negative electrode mixture layer covering the entire surface of the positive electrode mixture layer is arranged on the inner peripheral surface and the outer peripheral surface of the positive electrode mixture layer. Anything is acceptable.
- the lithium ion secondary battery of the present invention is a sheet-like positive electrode in which the positive electrode mixture layer is disposed on both surfaces of the metal current collector, and the positive electrode mixture layer is disposed from the winding start end to the winding end end;
- a sheet-like negative electrode in which a negative electrode mixture layer is arranged on both surfaces of a metal current collector, and the negative electrode mixture layer is arranged from a winding start end to a winding end end, and a sheet-like negative electrode interposed between the positive electrode and the negative electrode
- a sheet layer on which the separator is stacked is wound while being folded back in a substantially arc shape at both ends, and includes a winding group in which two upper and lower outer surfaces and two inner surfaces facing each outer surface are flat in the center portion, The winding start end portion of the negative electrode is disposed on the inner peripheral side of the wound group from the positive electrode, and the winding end end portion of the negative electrode is disposed on the outer peripheral side of the wound group from the positive electrode.
- the end, the end of winding of the positive electrode and the end of winding of the negative electrode are positioned corresponding to the flat surface.
- the winding start end portion of the negative electrode is not limited as long as being disposed from the winding center of the winding group than the winding start end portion of the positive electrode.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
本発明の第2の態様によるリチウムイオン2次電池は、請求項1記載のリチウムイオン2次電池において、正極の巻き始め端部と正極の巻き終わり端部とが、平坦部の表裏方向で互いに重ならないように配置され、負極の巻き始め端部と負極の巻き終わり端部とが、平坦部の表裏方向で互いに重ならないように配置されていることが望ましい。
本発明の第3の態様によるリチウムイオン2次電池は、請求項1または2記載のリチウムイオン2次電池において、捲回部の平坦部は、厚さ方向の中心軸を境に分離された上半平坦部と下半平坦部を有し、正極の巻き始め端部および負極の巻き始め端部は上半平坦部および下半平坦部の一方の内周側に配置され、正極の巻き終わり端部および負極の巻き終わり端部は、正極の巻き始め端部および負極の巻き始め端部が配置された上半平坦部および下半平坦部の一方の外周側に配置されていることが望ましい。
本発明の第4の態様によるリチウムイオン2次電池は、請求項1乃至3のいずれか1項に記載のリチウムイオン2次電池において、捲回群における最内周の正極の巻き始め側部分は、最外周の負極の巻き終り側部分に重ならないように配置され、捲回群における最内周の負極の巻き始め側部分は、最外周の負極の巻き終り側部分に重ならないように配置されていることが望ましい。
本発明の第5の態様によるリチウムイオン2次電池は、請求項1乃至4のいずれか1項に記載のリチウムイオン2次電池において、捲回群における最内周の正極の巻き始め側部分は、最外周の正極の巻き終り側部分および最外周の負極の巻き終り側部分に重ならないように配置され、捲回群における最内周の負極の巻き始め側部分は、最外周の正極の巻き終り側部分および最外周の負極の巻き終り側部分に重ならないように配置されていることが望ましい。
本発明の第6の態様によるリチウムイオン2次電池は、正極合材層を金属集電体の両面に配し、正極合材層を巻き始め端部から巻き終わり端部まで配したシート状の正極と、負極合材層を金属集電体の両面に配し、負極合材層を巻き始め端部から巻き終わり端部まで配したシート状の負極と、正極と負極との間に介在するシート状のセパレータとを重ねたシート層を、両端部で略円弧状に折り返しつつ捲回して中央部において上下2つの外面と各外面に対向する2つの内面が平坦面とされた捲回群を備え、負極の巻き始め端部は正極より捲回群の内周側に配置され、負極の巻き終わり端部は正極よりも捲回群の外周側に配置され、正極の巻き始め端部、負極の巻き始め端部、正極の巻き終わり端部および負極の巻き終わり端部は、平坦面に対応する位置に配置され、負極の巻き始め端部は、正極の巻き始め端部よりも捲回群の捲回中心よりに配置されている。
本発明の第7の態様によるリチウムイオン2次電池は、請求項6に記載のリチウムイオン2次電池において、正極合材層の内周面および外周面に正極合材層の全面を覆う負極合材層が配置されていることが望ましい。
本発明の第8の態様によるリチウムイオン2次電池は、請求項6または7に記載のリチウムイオン2次電池において、正極の巻き始め端部と正極の巻き終わり端部とが、中央部の表裏方向で互いに重ならないように配置され、負極の巻き始め端部と負極の巻き終わり端部とが、中央部の表裏方向で互いに重ならないように配置されていることが望ましい。
本発明の第9の態様によるリチウムイオン2次電池は、請求項6乃至8のいずれか1項に記載のリチウムイオン2次電池において、正極の巻き始め端部、負極の巻き始め端部、正極の巻き終わり端部および負極の巻き終わり端部は、捲回群の中央部における内面の一方と、内面の一方に対向する外面に配置されていることが望ましい。
本発明の第10の態様によるリチウムイオン2次電池は、請求項6乃至9のいずれか1項に記載のリチウムイオン2次電池において、捲回群における最内周の正極の巻き始め側部分は、最外周の負極の巻き終り側部分に重ならないように配置され、捲回群における最内周の負極の巻き始め側部分は、最外周の前極の巻き終り側部分に重ならないように配置されていることが望ましい。
本発明の第11の態様によるリチウムイオン2次電池は、請求項6乃至10のいずれか1項に記載のリチウムイオン2次電池において、捲回群における最内周の正極の巻き始め側部分は、最外周の正極の巻き終り側部分および最外周の負極の巻き終り側部分に重ならないように配置され、捲回群における最内周の負極の巻き始め側部分は、最外周の正極の巻き終り側部分および最外周の負極の巻き終り側部分に重ならないように配置されていることが望ましい。
なお、シート状のセパレータ21、23は、正極24と負極22との間に介在し、負極22の外周面に配置されたシート状のセパレータ23が捲回群20の外周面を構成する。
正極24は、正極合材層5を金属集電体、たとえばアルミニウム箔、の両面に、巻き始め端部24Sから巻き終わり端部24Eまでべた状に設けたシートである。アルミニウム箔の一方の端部には正極合材層5が塗布されない正極未塗工部4が形成され、正極集電部として用いられる。負極22は、負極合材層6を金属集電体、たとえば銅箔、の両面に、巻き始め端部22Sから巻き終わり端部22Eまでべた状に設けたシートである。銅箔の一方の端部には負極合材層6が塗布されない負極未塗工部3が形成され、負極集電部として用いられる。正極合材層5が塗布されない正極未塗工部4と負極合材層6が塗布されない負極未塗工部3とは、シートの長手方向の中心に対して反対側に配置されている。
図1に示すように、実施例1~4および比較例1~8の捲回群20における正極合材層は、正極活物質としてLiCoO2を用い、以下のように作製した。
すなわち、正極活物質、導電剤の黒鉛、結着剤のポリフッ化ビニリデンを85:10:5の重量比で混練機を用い、30分間混練し、正極合材を得た。正極合材を厚さ20μmのアルミニウム箔(基板)に両面塗工した。
実施例1~4のリチウムイオン2次電池と同様にして、図9~図12に示す実施例5および6のリチウムイオン2次電池を作製し、このリチウムイオン2次電池を比較例9~14のリチウムイオン2次電池と比較した。
図5の模式図の欄に図示されているように、比較例9、10のリチウムイオン2次電池は、負極22の巻き始め端部22Sが正極24の巻き始め端部24Sよりも捲回群20の中央寄りに配置され、正極24の巻き終わり端部24Eが負極22の巻き終わり端部22Eよりも中央寄りに配置されている。また、捲回群20の巻き始め端部側の最内周のシート層の極が負極である。しかしながら、捲回群20の巻き終わり端部を形成する最外周のシート層の極が正極である。
実施例1~4のリチウムイオン2次電池と同様にして、図9~図12に示す実施例7および8のリチウムイオン2次電池を作製した。なお、実施例7および8の捲回群20では、図7に示すように、正極活物質にLiNi0.85Co0.15Al0.05O2を用い、負極活物質に天然黒鉛を使用している。なお、電池の容量比(負極容量/正極容量)は1.0~1.2とした。
また、負極22の巻き終わり端部22Eは、上半平坦部の最外周において、正極24の巻き始め端部24Sおよび負極22の巻き始め端部22Sに対応する位置に達する手前の平坦面20Pに位置している。すなわち、捲回群20の最内周の末端から負極22の巻き始め端部22Sまでの負極22の巻き始め側部分は、捲回群20の最外周の末端から正極24の巻き終り端部24Eまでの正極24の巻き終り側部分および捲回群20の最外周の末端から負極22の巻き終り端部22Eまでの負極の巻き終り側部分に重ならないように配置されている。
換言すれば、上半平坦部における最外周の正極24の部分および最外周の負極22の部分は、それぞれ、上半平坦部における最内周の正極24の部分および最内周の負極22の部分と重なる領域を有していない。
また、負極22の巻き終わり端部22Eは、上半平坦部の最外周において、正極電極24の巻き始め端部24Sおよび負極22の巻き始め端部22Sに対応する位置を越えた平坦面20Pの位置に配置されている。すなわち、捲回群20の最内周の末端から負極22の巻き始め端部22Sまでの負極22の巻き始め側部分は、捲回群20の最外周の末端から正極24の巻き終り端部24Eまでの正極24の巻き終り側部分および捲回群20の最外周の末端から負極22の巻き終り端部22Eまでの負極の巻き終り側部分に一部に重なって配置されている。
換言すれば、上半平坦部における最外周の正極24および最外周の負極22の巻き始め側先端部分は、上半平坦部における最内周の正極24および最内周の負極22の巻き終り側先端部分と重っている。このため、図14(b)の実施例8のリチウムイオン2次電池は、捲回群20の最内周の巻き始め側先端部分と最外周の巻き終り側先端部分とが重っている分だけ、図14(a)の実施例7のリチウムイオン2次電池よりも厚くなっている。
捲回群20の厚さ、正極24、負極22間の距離を均一化するという効果を奏する。
日本出願特許出願2009年第223152号
Claims (11)
- 正極合材層を有するシート状の正極と、負極合材層を有するシート状の負極とがセパレータを介して捲回され、平坦部と、この平坦部の両側部に連接された円弧状部とを有する扁平形状に形成された捲回群と、
前記捲回群が電解液に浸漬された状態で収容され、前記シート状の正極と接続された正極外部端子と前記シート状の負極と接続された負極外部端子とを備えた電池缶とを備え、
前記負極の巻き始め端部が前記正極より捲回群の内周側に配置され、
前記負極の巻き終わり端部が前記正極よりも前記捲回群の外周側に配置され、
前記正極の巻き始め端部、前記負極の巻き始め端部および前記正極の巻き終わり端部、前記負極の巻き終わり端部が、前記捲回群の前記円弧部の領域内に配置されず、前記捲回群の平坦部の領域内に配置され、
前記正極合材層の内周面および外周面に前記正極合材層の全面を覆う前記負極合材層が配置されているリチウムイオン2次電池。 - 請求項1記載のリチウムイオン2次電池において、前記正極の前記巻き始め端部と前記正極の巻き終わり端部とが、前記平坦部の表裏方向で互いに重ならないように配置され、前記負極の前記巻き始め端部と前記負極の巻き終わり端部とが、前記平坦部の表裏方向で互いに重ならないように配置されているリチウムイオン2次電池。
- 請求項1または2記載のリチウムイオン2次電池において、前記捲回部の平坦部は、厚さ方向の中心軸を境に分離された上半平坦部と下半平坦部を有し、前記正極の巻き始め端部および前記負極の巻き始め端部は前記上半平坦部および前記下半平坦部の一方の内周側に配置され、前記正極の巻き終わり端部および前記負極の巻き終わり端部は、前記正極の巻き始め端部および前記負極の巻き始め端部が配置された前記上半平坦部および前記下半平坦部の前記一方の外周側に配置されているリチウムイオン2次電池。
- 請求項1乃至3のいずれか1項に記載のリチウムイオン2次電池において、前記捲回群における最内周の前記正極の巻き始め側部分は、最外周の前記負極の巻き終り側部分に重ならないように配置され、前記捲回群における最内周の前記負極の巻き始め側部分は、最外周の前記負極の巻き終り側部分に重ならないように配置されているリチウムイオン2次電池。
- 請求項1乃至4のいずれか1項に記載のリチウムイオン2次電池において、前記捲回群における最内周の前記正極の巻き始め側部分は、最外周の前記正極の巻き終り側部分および前記最外周の前記負極の巻き終り側部分に重ならないように配置され、前記捲回群における最内周の前記負極の巻き始め側部分は、最外周の前記正極の巻き終り側部分および最外周の前記負極の巻き終り側部分に重ならないように配置されているリチウムイオン2次電池。
- 正極合材層を金属集電体の両面に配し、前記正極合材層を巻き始め端部から巻き終わり端部まで配したシート状の正極と、負極合材層を金属集電体の両面に配し、前記負極合材層を巻き始め端部から巻き終わり端部まで配したシート状の負極と、前記正極と負極との間に介在するシート状のセパレータとを重ねたシート層を、両端部で略円弧状に折り返しつつ捲回して中央部において上下2つの外面と前記各外面に対向する2つの内面が平坦面とされた捲回群を備え、
前記負極の巻き始め端部は前記正極より捲回群の内周側に配置され、
前記負極の巻き終わり端部は前記正極よりも前記捲回群の外周側に配置され、
前記正極の巻き始め端部、前記負極の巻き始め端部、前記正極の巻き終わり端部および前記負極の巻き終わり端部は、前記平坦面に対応する位置に配置され、
前記負極の巻き始め端部は、前記正極の巻き始め端部よりも前記捲回群の捲回中心よりに配置されているリチウムイオン2次電池。 - 請求項6に記載のリチウムイオン2次電池において、前記正極合材層の内周面および外周面に前記正極合材層の全面を覆う前記負極合材層が配置されているリチウムイオン2次電池。
- 請求項6または7に記載のリチウムイオン2次電池において、前記正極の前記巻き始め端部と前記正極の巻き終わり端部とが、前記中央部の表裏方向で互いに重ならないように配置され、前記負極の前記巻き始め端部と前記負極の巻き終わり端部とが、前記中央部の表裏方向で互いに重ならないように配置されているリチウムイオン2次電池。
- 請求項6乃至8のいずれか1項に記載のリチウムイオン2次電池において、前記正極の巻き始め端部、前記負極の巻き始め端部、前記正極の巻き終わり端部および前記負極の巻き終わり端部は、前記捲回群の中央部における前記内面の一方と、前記内面の一方に対向する前記外面に配置されているリチウムイオン2次電池。
- 請求項6乃至9のいずれか1項に記載のリチウムイオン2次電池において、前記捲回群における最内周の前記正極の巻き始め側部分は、最外周の前記負極の巻き終り側部分に重ならないように配置され、前記捲回群における最内周の前記負極の巻き始め側部分は、最外周の前記負極の巻き終り側部分に重ならないように配置されているリチウムイオン2次電池。
- 請求項6乃至10記載のリチウムイオン2次電池において、前記捲回群における最内周の前記正極の巻き始め側部分は、最外周の前記正極の巻き終り側部分および前記最外周の前記負極の巻き終り側部分に重ならないように配置され、前記捲回群における最内周の前記負極の巻き始め側部分は、最外周の前記正極の巻き終り側部分および最外周の前記負極の巻き終り側部分に重ならないように配置されているリチウムイオン2次電池。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201080036446.XA CN102484285B (zh) | 2009-09-28 | 2010-08-11 | 锂离子二次电池 |
US13/394,909 US20120202097A1 (en) | 2009-09-28 | 2010-08-11 | Lithium ion secondary cell |
JP2011532941A JP5449377B2 (ja) | 2009-09-28 | 2010-08-11 | リチウムイオン2次電池 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-223152 | 2009-09-28 | ||
JP2009223152 | 2009-09-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011036960A1 true WO2011036960A1 (ja) | 2011-03-31 |
Family
ID=43795720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/063649 WO2011036960A1 (ja) | 2009-09-28 | 2010-08-11 | リチウムイオン2次電池 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20120202097A1 (ja) |
JP (1) | JP5449377B2 (ja) |
CN (1) | CN102484285B (ja) |
WO (1) | WO2011036960A1 (ja) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012221828A (ja) * | 2011-04-12 | 2012-11-12 | Toshiba Mitsubishi-Electric Industrial System Corp | 電池の組立システム、電池素子本体の位置決め搬送装置 |
JP2013073768A (ja) * | 2011-09-28 | 2013-04-22 | Gs Yuasa Corp | 蓄電素子 |
JP2015128026A (ja) * | 2013-12-27 | 2015-07-09 | 日立オートモティブシステムズ株式会社 | 角形二次電池 |
JP2017059395A (ja) * | 2015-09-16 | 2017-03-23 | トヨタ自動車株式会社 | リチウムイオン電池 |
JP2019169353A (ja) * | 2018-03-23 | 2019-10-03 | 三洋電機株式会社 | 非水電解質二次電池 |
JP2019179741A (ja) * | 2018-03-30 | 2019-10-17 | 三洋電機株式会社 | 非水電解質二次電池及び非水電解質二次電池の製造方法 |
JP2020077492A (ja) * | 2018-11-06 | 2020-05-21 | トヨタ自動車株式会社 | 非水電解液二次電池 |
JPWO2022019078A1 (ja) * | 2020-07-22 | 2022-01-27 | ||
JP2022127950A (ja) * | 2021-02-22 | 2022-09-01 | プライムプラネットエナジー&ソリューションズ株式会社 | 二次電池および二次電池の製造方法 |
JP2023063138A (ja) * | 2021-10-22 | 2023-05-09 | プライムプラネットエナジー&ソリューションズ株式会社 | 二次電池 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11342588B2 (en) * | 2019-12-16 | 2022-05-24 | Enevate Corporation | Silicon-based energy storage devices with electrolyte containing dihydrofuranone based compound |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0574496A (ja) * | 1991-09-12 | 1993-03-26 | Asahi Chem Ind Co Ltd | 二次電池 |
JP2002008708A (ja) * | 2000-06-20 | 2002-01-11 | Denso Corp | 扁平形状巻回型電極電池 |
JP2003077543A (ja) * | 2001-09-05 | 2003-03-14 | Toshiba Battery Co Ltd | 扁平形非水電解質二次電池 |
JP2003288941A (ja) * | 2002-03-27 | 2003-10-10 | Sanyo Electric Co Ltd | リチウム二次電池 |
JP2007213948A (ja) * | 2006-02-09 | 2007-08-23 | Panasonic Ev Energy Co Ltd | 角型電池用電極群の製造方法および角形電池用電極群 |
JP2007299580A (ja) * | 2006-04-28 | 2007-11-15 | Matsushita Electric Ind Co Ltd | 非水電解質角型二次電池 |
JP2009026705A (ja) * | 2007-07-23 | 2009-02-05 | Toyota Motor Corp | 電池 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5486215A (en) * | 1993-11-19 | 1996-01-23 | Medtronic, Inc. | Electrode assembly and method |
CN1139142C (zh) * | 1997-02-28 | 2004-02-18 | 旭化成株式会社 | 无水二次电池及其制造方法 |
US5958088A (en) * | 1998-03-04 | 1999-09-28 | Duracell, Inc. | Prismatic cell construction |
JP3730491B2 (ja) * | 1999-07-28 | 2006-01-05 | 三菱化学株式会社 | 制御電極表面を有する電池 |
FR2849280B1 (fr) * | 2002-12-23 | 2006-12-22 | Batscap Sa | Procede et dispositif de realisation d'ensembles de stockage d'energie |
JP4743752B2 (ja) * | 2005-04-11 | 2011-08-10 | 日立マクセル株式会社 | リチウムイオン二次電池 |
JP2007335319A (ja) * | 2006-06-16 | 2007-12-27 | Sony Corp | 非水電解質二次電池 |
KR100876271B1 (ko) * | 2007-05-29 | 2008-12-26 | 삼성에스디아이 주식회사 | 리튬 이차 전지 |
-
2010
- 2010-08-11 US US13/394,909 patent/US20120202097A1/en not_active Abandoned
- 2010-08-11 WO PCT/JP2010/063649 patent/WO2011036960A1/ja active Application Filing
- 2010-08-11 JP JP2011532941A patent/JP5449377B2/ja not_active Expired - Fee Related
- 2010-08-11 CN CN201080036446.XA patent/CN102484285B/zh not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0574496A (ja) * | 1991-09-12 | 1993-03-26 | Asahi Chem Ind Co Ltd | 二次電池 |
JP2002008708A (ja) * | 2000-06-20 | 2002-01-11 | Denso Corp | 扁平形状巻回型電極電池 |
JP2003077543A (ja) * | 2001-09-05 | 2003-03-14 | Toshiba Battery Co Ltd | 扁平形非水電解質二次電池 |
JP2003288941A (ja) * | 2002-03-27 | 2003-10-10 | Sanyo Electric Co Ltd | リチウム二次電池 |
JP2007213948A (ja) * | 2006-02-09 | 2007-08-23 | Panasonic Ev Energy Co Ltd | 角型電池用電極群の製造方法および角形電池用電極群 |
JP2007299580A (ja) * | 2006-04-28 | 2007-11-15 | Matsushita Electric Ind Co Ltd | 非水電解質角型二次電池 |
JP2009026705A (ja) * | 2007-07-23 | 2009-02-05 | Toyota Motor Corp | 電池 |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012221828A (ja) * | 2011-04-12 | 2012-11-12 | Toshiba Mitsubishi-Electric Industrial System Corp | 電池の組立システム、電池素子本体の位置決め搬送装置 |
JP2013073768A (ja) * | 2011-09-28 | 2013-04-22 | Gs Yuasa Corp | 蓄電素子 |
JP2015128026A (ja) * | 2013-12-27 | 2015-07-09 | 日立オートモティブシステムズ株式会社 | 角形二次電池 |
JP2017059395A (ja) * | 2015-09-16 | 2017-03-23 | トヨタ自動車株式会社 | リチウムイオン電池 |
JP7109950B2 (ja) | 2018-03-23 | 2022-08-01 | 三洋電機株式会社 | 非水電解質二次電池 |
JP2019169353A (ja) * | 2018-03-23 | 2019-10-03 | 三洋電機株式会社 | 非水電解質二次電池 |
JP2019179741A (ja) * | 2018-03-30 | 2019-10-17 | 三洋電機株式会社 | 非水電解質二次電池及び非水電解質二次電池の製造方法 |
JP7046682B2 (ja) | 2018-03-30 | 2022-04-04 | 三洋電機株式会社 | 非水電解質二次電池及び非水電解質二次電池の製造方法 |
US11387495B2 (en) | 2018-11-06 | 2022-07-12 | Toyota Jidosha Kabushiki Kaisha | Non-aqueous electrolyte secondary battery |
JP2020077492A (ja) * | 2018-11-06 | 2020-05-21 | トヨタ自動車株式会社 | 非水電解液二次電池 |
JP7079414B2 (ja) | 2018-11-06 | 2022-06-02 | トヨタ自動車株式会社 | 非水電解液二次電池 |
WO2022019078A1 (ja) * | 2020-07-22 | 2022-01-27 | 株式会社村田製作所 | 二次電池 |
JPWO2022019078A1 (ja) * | 2020-07-22 | 2022-01-27 | ||
JP7459944B2 (ja) | 2020-07-22 | 2024-04-02 | 株式会社村田製作所 | 二次電池 |
JP2022127950A (ja) * | 2021-02-22 | 2022-09-01 | プライムプラネットエナジー&ソリューションズ株式会社 | 二次電池および二次電池の製造方法 |
JP7412374B2 (ja) | 2021-02-22 | 2024-01-12 | プライムプラネットエナジー&ソリューションズ株式会社 | 二次電池および二次電池の製造方法 |
JP2023063138A (ja) * | 2021-10-22 | 2023-05-09 | プライムプラネットエナジー&ソリューションズ株式会社 | 二次電池 |
JP7389780B2 (ja) | 2021-10-22 | 2023-11-30 | プライムプラネットエナジー&ソリューションズ株式会社 | 二次電池 |
Also Published As
Publication number | Publication date |
---|---|
US20120202097A1 (en) | 2012-08-09 |
JPWO2011036960A1 (ja) | 2013-02-14 |
CN102484285A (zh) | 2012-05-30 |
JP5449377B2 (ja) | 2014-03-19 |
CN102484285B (zh) | 2014-07-23 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5449377B2 (ja) | リチウムイオン2次電池 | |
US10559843B2 (en) | Non-aqueous electrolyte battery, non-aqueous electrolyte battery pack, and vehicle | |
JP4659861B2 (ja) | 扁平型二次電池およびその製造方法 | |
US9614194B2 (en) | Battery | |
JP5618698B2 (ja) | 非水電解質電池 | |
WO2012105362A1 (ja) | 非水電解液二次電池 | |
JP6138436B2 (ja) | 非水電解質二次電池及びその製造方法 | |
JP2013201077A (ja) | 非水電解質二次電池 | |
KR101707335B1 (ko) | 비수 전해액 2차 전지 | |
KR20140091480A (ko) | 축전 소자, 축전 시스템, 및 그 제조 방법 | |
CN112204791A (zh) | 电池及电池包 | |
US8703314B2 (en) | Prismatic battery | |
WO2014050114A1 (ja) | 非水電解質二次電池 | |
JP2014035929A (ja) | 非水電解質二次電池 | |
US20080113260A1 (en) | Prismatic nonaqueous electrolyte secondary battery and method for manufacturing the same | |
JP2010040488A (ja) | 電池 | |
US11456460B2 (en) | Nonaqueous electrolyte secondary battery | |
JP2000277062A (ja) | 薄型電池 | |
WO2013047515A1 (ja) | 非水電解質二次電池 | |
WO2019098056A1 (ja) | リチウムイオン二次電池 | |
JP2006244833A (ja) | リチウム二次電池およびその製造方法 | |
JP7320165B2 (ja) | 二次電池 | |
JP2016085884A (ja) | 電池 | |
KR101917488B1 (ko) | 편평형 이차 전지 | |
JP4270835B2 (ja) | 非水電解質電池 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201080036446.X Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10818636 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011532941 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13394909 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 10818636 Country of ref document: EP Kind code of ref document: A1 |