WO2013047515A1 - Batterie secondaire à électrolyte non aqueux - Google Patents

Batterie secondaire à électrolyte non aqueux Download PDF

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Publication number
WO2013047515A1
WO2013047515A1 PCT/JP2012/074549 JP2012074549W WO2013047515A1 WO 2013047515 A1 WO2013047515 A1 WO 2013047515A1 JP 2012074549 W JP2012074549 W JP 2012074549W WO 2013047515 A1 WO2013047515 A1 WO 2013047515A1
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Prior art keywords
negative electrode
positive electrode
electrode
active material
winding start
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PCT/JP2012/074549
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English (en)
Japanese (ja)
Inventor
吉田　聡司
卓弥 森本
吉久三 宮本
大下　竜司
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三洋電機株式会社
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Publication of WO2013047515A1 publication Critical patent/WO2013047515A1/fr

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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
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a non-aqueous electrolyte secondary battery.
  • Non-aqueous electrolyte secondary batteries represented by lithium-ion batteries are used in a wide variety of applications, including power supplies for portable devices, power supplies for electric tools and electric vehicles, power supplies for backups, and the like.
  • lithium-containing transition metal oxides such as lithium cobaltate, lithium nickelate, and lithium manganate capable of reversibly occluding and releasing lithium ions are used as the positive electrode active material.
  • the positive electrode active material is mixed with a binder, a conductive agent, and the like, applied onto a metal foil such as an aluminum foil as a positive electrode core, and processed into a positive electrode plate.
  • the negative electrode active material carbonaceous materials such as natural graphite, artificial graphite and coke, and oxides and alloy materials such as silicon and oxides thereof are used.
  • the negative electrode active material is mixed with a binder or the like, applied onto a metal foil such as a copper foil as a negative electrode core, processed into a negative electrode plate, and used.
  • the positive electrode plate and the negative electrode plate are processed to a predetermined size, form an electrode body through a resin microporous separator such as polyethylene, and are housed and sealed together with the electrolyte.
  • a resin microporous separator such as polyethylene
  • a bottomed rectangular parallelepiped metal exterior can and a laminate sheet were used in order to increase the degree of freedom of design of the portable device in which the battery is accommodated.
  • a pouch exterior is used. Therefore, the external appearance of a battery using such an exterior body is a rectangular parallelepiped shape or a flat shape.
  • the electrode body accommodated in such an exterior body is processed into a flat shape according to the shape of the exterior body.
  • the electrode body having such a shape is manufactured by a method in which a long electrode plate is wound together with a separator and then formed into a flat shape (Patent Document 1), or a method in which a plate electrode plate is laminated in a multilayer with a separator. .
  • Patent Document 1 a method in which a plate electrode plate is laminated in a multilayer with a separator.
  • Patent Document 1 the thickness of the electrode body is adjusted by adjusting the active material coating start position on the electrode plate, the tab attachment position (hereinafter sometimes referred to as a winding layout), and the like in the wound electrode body. Propose to reduce.
  • the inventors of the present invention produced electrode bodies with various winding layouts and charged / discharged a battery using the same. Even when the thickness of the electrode body before charging / discharging the battery was thin, charging / discharging As a result of repeating the above, a battery with an increased degree of battery thickness expansion was produced.
  • the battery swelling may be caused by distortion in the wound state of the electrode body, but if the distortion occurs, the electrode reaction may be hindered, leading to deterioration of various battery characteristics such as charge / discharge cycle characteristics. is there.
  • An object of the present invention is to solve the above-mentioned problems and to provide a nonaqueous electrolyte secondary battery that can suppress an increase in battery thickness even when a charge / discharge cycle is repeated in a nonaqueous electrolyte secondary battery including a flat wound electrode body. It is to provide.
  • the non-aqueous electrolyte secondary battery of the present invention includes a strip-shaped positive electrode in which a negative electrode active material layer is formed on a positive electrode core, and a negative electrode active material layer on a negative electrode core.
  • a strip-shaped negative electrode comprising a flat electrode body wound around a central axis via a separator, a non-aqueous electrolyte, a positive electrode external terminal and a negative electrode external terminal, and the electrode body and the non-aqueous electrolyte are
  • a nonaqueous electrolyte secondary battery including a packaged outer body, wherein a flat electrode body has a pair of flat surfaces in which a cross section cut by a plane perpendicular to the central axis is composed of one flat portion and the other flat portion And a pair of curved parts composed of one curved part and the other curved part connected to both ends thereof, one curved part, the other flat part, the other curved part counterclockwise about the central axis It is an oval shape arranged in the order of one curved part, including the central axis and orthogonal to the flat part
  • the negative plane is defined as the central plane
  • the negative electrode has a negative electrode winding start end portion that is the other flat portion and is between one curved portion
  • the positive electrode has a winding start end part of the positive electrode on the other flat part between the center plane and the other curved part, and the other curved part from the winding start end part of the positive electrode
  • the negative electrode winding start section is opposed on the outer peripheral side
  • the positive electrode core body is There is a positive electrode winding start section that is exposed on the surface, and further, there is a positive electrode active material layer double-sided formation portion on which the positive electrode active material layer is formed on both surfaces of the positive electrode core in the direction of one curved portion.
  • the boundary between the section and the positive electrode active material layer double-sided formation part is formed at a position that does not overlap with the boundary between the negative electrode active material layer single-sided formation part and the negative electrode active material double-sided formation part.
  • the negative electrode tab is attached between the winding start end of the negative electrode and the central plane, and the positive electrode is attached to the positive electrode between the central plane and the other curved portion in the positive electrode winding start section.
  • One end of the negative electrode tab and one end of the positive electrode tab both protrude from one end surface of the electrode body and are electrically connected to external terminals of the same polarity, respectively, and the other end surface of the negative electrode tab and the other end surface of the electrode body The other end of the positive electrode tab and the other end of the electrode body The minimum length with the surface is the same.
  • the flat portion is a portion in which electrodes and separators are laminated in a straight line, and the curved portion is laminated in an arc shape.
  • the one bent portion and the other bent portion of the electrode body indicate a bent portion on one side and a bent portion on the other side with respect to the central plane.
  • the one flat part and the other flat part of the electrode body include a central axis and indicate a flat part on one side and a flat part on the other side with respect to a virtual plane orthogonal to the central plane. .
  • the shortest length between the other end of the negative electrode tab and the other end surface of the electrode body is equal to the shortest length between the other end of the positive electrode tab and the other end surface of the electrode body. It is not limited to the same, and even if designed with the same length, there is a possibility that the electrode plate may be shifted depending on the winding state. Therefore, an error of about 10% is included in the length on the negative electrode side and the positive electrode side. If the error is up to that point, the effect of the present invention is obtained.
  • the winding start end of the positive electrode can exist between the center plane and the other curved portion.
  • the negative electrode has negative electrode active material layers formed on both sides of the negative electrode core up to the end of winding, and the end of winding of the negative electrode is one curved portion of the electrode body. be able to.
  • the outermost periphery of the electrode body is a positive electrode core, and the winding end portion of the positive electrode is in one flat portion or the other curved portion, and the positive electrode winding start section It can be made not to overlap with the positive electrode active material layer.
  • the shortest length between the other end of the negative electrode tab and the positive electrode tab and the other end surface of the electrode body is 10 which is the shortest length between the one end surface and the other end surface of the electrode body. Up to 90%.
  • the electrode body of a non-aqueous electrolyte secondary battery as in the above-described invention, it is possible to provide a non-aqueous electrolyte battery that can suppress battery swelling due to a charge / discharge cycle.
  • FIG. 1 is an external view of a nonaqueous electrolyte secondary battery according to the present invention. It is a perspective view of the electrode body with a sealing body used for the nonaqueous electrolyte secondary battery which concerns on this invention.
  • 1 is a cross-sectional view of an electrode body used in Example 1.
  • FIG. FIG. 4A is a cross-sectional view of the electrode body winding start portion
  • FIG. 4B is a plan view of the electrode body.
  • FIG. 5 (a) is sectional drawing of an electrode body winding start part
  • FIG.5 (b) is a top view of an electrode body.
  • FIG. 5 (a) is sectional drawing of an electrode body winding start part
  • FIG.5 (b) is a top view of an electrode body.
  • FIG. 5 (a) is sectional drawing of an electrode body winding start part
  • FIG.5 (b) is a top view of an electrode body.
  • FIG. 5 (a) is sectional drawing of an electrode body winding start part
  • FIG. 6 (a) is sectional drawing of an electrode body winding start part
  • FIG.6 (b) is a top view of an electrode body. It is a figure which shows the electrode body used for the comparative example 3
  • FIG. 7 (a) is sectional drawing of an electrode body winding start part
  • FIG.7 (b) is a top view of an electrode body.
  • FIG. 1 is an external view of a rectangular sealed battery according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing a state in which the negative electrode tab and the positive electrode tab are led out from the electrode body housed in the rectangular sealed battery of FIG. 1 and the negative electrode tab is connected to the negative electrode external terminal of the sealing body.
  • a nonaqueous electrolyte secondary battery 10 As shown in FIG. 1, a nonaqueous electrolyte secondary battery 10 according to the present invention has an opening of an outer casing 11 (hereinafter referred to as an outer casing) made of a bottomed and rectangular parallelepiped cylindrical aluminum alloy.
  • the sealing body 12 is sealed.
  • the sealing body 12 includes a negative electrode external terminal 121, a sealing plug 122 that seals the injection hole for introducing the electrolyte into the outer can 11, and a safety valve that cleaves and releases the pressure when the battery internal pressure becomes abnormally high. 123.
  • the negative electrode external terminal 121 is electrically insulated from the sealing body 12 having the polarity of the positive electrode, as will be described later.
  • a negative electrode tab 153 and a positive electrode tab 163 are led out from one end surface 131 of the electrode body 13, and the negative electrode tab 153 is welded to a component electrically connected to the negative electrode external terminal 121 of the sealing body 12. Thereafter, the electrode body 13 is inserted into the outer can 11. At this time, the positive electrode tab 163 is sandwiched between the opening of the outer can 11 and the peripheral edge of the sealing body 12.
  • the fitting portion of the outer can 11 and the sealing body 12 is welded together with the positive electrode tab 163 by laser welding. Accordingly, since the portion other than the negative electrode external terminal 121 of the outer can 11 and the sealing body 12 has a positive polarity, it functions as a positive electrode external terminal.
  • ⁇ Preparation of positive electrode plate 95 parts by mass of lithium cobaltate (LiCoO 2 ) and 5 parts by mass of a carbon material as a conductive agent are mixed, and 95 parts by mass of this mixture and 5 parts by mass of polyvinylidene fluoride as a binder are mixed with N-methyl-2-
  • a positive electrode mixture slurry was prepared by dispersing in pyrrolidone (NMP). This slurry was uniformly applied to both surfaces of a positive electrode core made of an aluminum foil having a thickness of 13 ⁇ m to be a positive electrode core by a doctor blade method.
  • the slurry was not applied to the positive electrode core that is the winding start section or the portion that is to be positioned on the outer periphery of the electrode body, and the aluminum foil was exposed. Thereafter, the slurry applied to the aluminum foil was dried by heating to produce a dry electrode plate having an active material layer formed on the aluminum foil. The dried electrode plate was compressed with a roller press, cut into a predetermined size, and a positive electrode tab was attached to the positive electrode core in the winding start section to produce a positive electrode plate.
  • Graphite as a negative electrode active material, styrene butadiene rubber as a binder, and carboxymethyl cellulose as a viscosity modifier were mixed at 95: 2: 3 (mass ratio), and the mixture was dispersed in water to prepare a slurry.
  • This slurry was uniformly applied on both surfaces of a copper foil having a thickness of 8 ⁇ m serving as a negative electrode core by a doctor blade method. At this time, the slurry was not applied to the negative electrode core used as the winding start section, and the copper foil was exposed. Then, the slurry apply
  • the positive electrode plate, the negative electrode plate, and a separator made of a polyethylene microporous film are wound into a cylindrical shape using a winder so that the positive electrode plate and the negative electrode plate are insulated by the separator, and the end of the winding is an adhesive tape. Fixed with 135. Then, it shape
  • One end side 1531 of the negative electrode tab 153 led out from the electrode body 13 is welded to a part electrically connected to the sealing body 12 and the negative electrode external terminal 121, and the electrode body 13 is accommodated in the outer can 11 and the outer can 11 The opening and the sealing body 12 were fitted.
  • one end side 1631 of the positive electrode tab 163 was sandwiched between the opening of the outer can 11 and the sealing body 12, and the fitting portion of the opening of the outer can 11 and the sealing body 12 was laser welded together with the positive electrode tab 163.
  • a predetermined amount of the electrolyte was injected from a liquid injection hole (not shown) and sealed with a sealing plug 122. In this way, a nonaqueous electrolyte secondary battery having a design capacity of 1240 mAh and a height of 56 mm, a width of 44 mm, and a thickness of 4.2 mm was produced.
  • a battery having the following specifications was assembled using the above-described method for manufacturing a non-aqueous electrolyte secondary battery.
  • symbol is used for the same components by an Example and a comparative example.
  • FIG. 3 and FIG. 4A show the winding layout of Example 1 in the cross-sectional view of the electrode body. In these figures, the illustration of the separator is omitted.
  • FIG. 4A shows only the electrode body winding start portion. From the winding start end portion 151 to the first bent portion (the other bent portion 22 of the electrode body) of the portion where the negative electrode 15 starts to be wound, there is a negative electrode winding start section in which the negative electrode active material layer is not formed on both surfaces of the negative electrode core 152. Provided. Then, a negative electrode tab 153 made of nickel having a thickness of 0.1 mm and a width of 3 mm was attached by eyelet caulking.
  • the negative electrode tab may be attached to the negative electrode core by using a welding method such as ultrasonic welding or spot welding.
  • the negative electrode winding start end portion 151 and the negative electrode tab 153 are disposed so as to be the other flat portion 32 of the electrode body and between the one bent portion 21 of the electrode body and the central plane 50.
  • the third curved portion passes through one flat portion 31 of the electrode body, the second curved portion (one curved portion 21 of the electrode body), and the other flat portion 32.
  • the negative electrode active material was formed only on the outside of the winding of the negative electrode core.
  • the negative electrode active material layer was formed on both surfaces of the negative electrode core until the winding end part 154 of the negative electrode ahead. That is, the winding start section of only the negative electrode core and the boundary 155 of the single-sided formation portion of the negative electrode active material layer and the boundary 156 of the single-sided formation portion and double-sided formation portion of the negative electrode active material layer were arranged in the other curved portion 22.
  • the boundary 156 was set at a position that did not overlap with the boundary 165 between the positive electrode winding start section and the positive electrode active material layer double-sided forming portion, which will be described later. And the winding end part 154 of the negative electrode was disposed on one curved part 21 of the electrode body.
  • the winding start end portion 161 where the winding of the positive electrode 16 starts is disposed between the central plane 50 and the other curved portion 22 of the electrode body.
  • the positive electrode core 162 passes from the winding start end 161 of the positive electrode through the first curved portion (the other curved portion 22 of the electrode body) to one flat portion 31 of the electrode body to the central plane 50.
  • the positive electrode active material layer was not provided on both sides of the positive electrode, and a positive electrode winding start section was provided.
  • a positive electrode tab 163 made of an aluminum alloy having a thickness of 0.03 mm and a width of 6 mm was attached to the winding start section of the positive electrode by ultrasonic welding.
  • an eyelet caulking method can be used in addition to various welding methods.
  • the winding start section of the positive electrode was arranged so as to be on the outer peripheral side of the winding start section of the negative electrode 15 when the negative electrode 15 was wound.
  • the boundary 165 between the positive electrode winding start section and the positive electrode active material layer is disposed on one flat portion, the position is close so as not to overlap the boundary between the negative electrode winding start section and the negative electrode active material layer double-sided forming portion 156 ( If the distance is about 1 to 4 mm, the battery capacity can be increased.
  • a positive electrode active material layer was formed on both sides of the positive electrode core body from the positive electrode winding start section to the positive electrode winding end portion 164, that is, in the positive electrode winding end direction.
  • the outermost periphery of the electrode body is a positive electrode core body, and the positive electrode winding end portion 164 and the positive electrode core body on the front periphery are fixed with an adhesive tape 135. At this time, the winding end portion 164 of the positive electrode was disposed between the one flat portion 31 and the other curved portion 22 of the electrode body.
  • the section which goes back from the winding end part 164 of the positive electrode, the other curved part 22, the other flat part 32 and the one curved part 21, does not provide the positive electrode active material layer on both surfaces of the positive electrode core, Further, in the section up to about one round before, the positive electrode active material layer was provided only on the surface facing the negative electrode active material layer. That is, the boundary 166 between only the positive electrode core at the outermost periphery of the electrode body and the single-sided formation part of the positive-electrode active material layer, and the boundary 167 between the single-sided and double-sided formation part of the positive electrode active material layer It was arranged at the boundary with the flat part.
  • the boundary between the portion where the negative electrode active material layer or the positive electrode active material layer is formed and the core body exposed portion is positioned due to the shift generated in the process of applying the active material layer or the shift generated in the winding process of the electrode body May shift. If this deviation is within about 2 mm, it does not significantly affect the thickness of the electrode body, and is allowed.
  • the attachment position of the negative electrode tab and the positive electrode tab to the electrode body of the battery which concerns on FIG. 4 at Example 1 is shown.
  • the other end 1532 of the negative electrode tab and the other end 1632 of the positive electrode tab were attached at positions where the shortest length from the other end surface 136 of the electrode body was 15 mm.
  • a resin adhesive tape can be attached to the negative electrode tab 153 or the positive electrode tab 163 in order to prevent short circuit or interference with other components.
  • the electrode body was prepared as described above, and the nonaqueous electrolyte secondary battery using this electrode body was designated as the battery of Example 1.
  • Comparative Example 1 As shown in FIG. 5, the boundary 155 between the winding start section of the negative electrode and the portion where the negative electrode active material layer is formed only on one side of the negative electrode core, and the single-sided formation part of the negative electrode active material layer approximately one round ahead An electrode body was fabricated in the same manner as in Example 1 except that the boundary 156 with the double-sided formation portion was disposed on the other flat portion 32 of the electrode body. A non-aqueous electrolyte secondary battery using this electrode body was used as a battery of Comparative Example 1.
  • Comparative Example 2 As shown in FIG. 6, an electrode body was fabricated in the same manner as in Example 1 except that the shortest length between the other end 1532 of the positive electrode tab and the other end surface 136 of the electrode body was set to 35 mm. A non-aqueous electrolyte secondary battery using this electrode body was used as a battery of Comparative Example 2.
  • this electrode body had no positive electrode winding start section, and positive electrode active material layers were formed on both surfaces of the positive electrode core body 162 from the positive electrode winding start end portion 161.
  • the electrode body was produced like Example 1 except having made the shortest length from the other end 1632 of a positive electrode tab and the other end surface of an electrode body into 35 mm.
  • a non-aqueous electrolyte secondary battery using this electrode body was used as a battery of Comparative Example 3.
  • Table 1 shows the test results of the above examples and comparative examples.
  • Table 1 shows the following.
  • Example 1 which is an embodiment of the present invention, Comparative Example 1 in which the boundary between the negative electrode core and the negative electrode active material layer is located in a flat portion instead of a curved portion of the electrode body, and from the end of the tab and the end face of the electrode body
  • Comparative Example 2 having different lengths of the negative electrode and the positive electrode is compared, there is almost no difference in the battery thickness at the initial stage immediately after the battery is assembled.
  • the battery thickness of Example 1 was the smallest after the charge / discharge cycle was repeated 500 times.
  • both the boundary position of the negative electrode active material layer and the balance of the lengths of the negative electrode tab and the positive electrode tab from the end surface of the electrode body both affect the swelling of the battery thickness. That is, it can be estimated that the winding layout of the battery of Example 1 has a structure in which distortion is less likely to accumulate than that of the comparative example battery.
  • the boundary between the negative electrode core and the negative electrode active material layer is located in a flat portion instead of a curved portion of the electrode body, and the length from the end of the negative electrode tab and the end surface of the electrode body is different from that of the positive electrode tab.
  • the battery thickness is larger in the initial stage immediately after the battery is assembled, as compared with Example 1 and other comparative examples. It has become.
  • the length between the end of the negative electrode tab or the positive electrode tab and the end face of the electrode body is 15 mm. Regardless of the length of the tab to be performed, the effect of the present invention is achieved. However, if it is too short, the connection between the tab and the electrode plate becomes weak, and the resistance value of the battery may increase. If it is too long, the tab may come into contact with the opposite pole due to an external load such as a drop impact. Therefore, the shortest length between the other end of the negative electrode tab and the positive electrode tab and the other end surface of the electrode body is preferably 10 to 90% of the shortest length between the one end surface 131 and the other end surface 136 of the electrode body.
  • the winding start end of the positive electrode may be between the center plane and one of the curved portions of the electrode body, but the winding start section of the positive electrode becomes long and the facing length with the winding start section of the negative electrode becomes large. Therefore, the probability of occurrence of a short circuit may increase. It is preferable that the winding start end portion of the positive electrode is located between the center plane and the other curved portion of the electrode body because the probability of a short circuit is considered to decrease.
  • the end of winding end of the negative electrode is located at one curved portion of the electrode body in consideration of the balance of stacking of electrodes and separators in the flat portion.
  • the boundary between the positive electrode winding start section and the positive electrode active material layer and the positive electrode winding end end portion do not overlap in consideration of the balance of stacking of electrodes and separators.
  • a mixed cathode active material of hexagonal lithium cobaltate and lithium nickel manganese cobaltate which is a lithium transition metal composite oxide is used as the cathode, but only lithium cobaltate is used as the cathode active material.
  • lithium nickelate or lithium manganate may be used.
  • the transition metal of the lithium transition metal composite oxide may be replaced with another element, or another element simple substance or compound may be added to the lithium transition metal composite oxide.
  • graphite is used as the negative electrode active material, but other carbon materials such as coke can be used. Moreover, silicon, its oxide, an alloy type, and an oxide type negative electrode active material can also be used.
  • the separator is made of polyethylene and has micropores, but may be made of polyolefin other than polyethylene such as polypropylene. It is also possible to use a resin microporous membrane other than polyolefin.
  • the nonaqueous electrolyte secondary battery in which the swelling of the battery is suppressed even after the charge / discharge cycle can be provided, the industrial applicability is great.
  • Nonaqueous electrolyte secondary battery 11 Exterior body (exterior can) 12 Sealing body 13 Electrode body 133, 134, 135 Adhesive tape 136 The other end face 14 of the electrode body 15 Central axis 15 Negative electrode 151 Negative winding start end 152 Negative electrode core 153 Negative electrode tab 1531 One end 1532 of the negative electrode tab The other end of the negative electrode tab 154 Negative electrode winding end portion 155 Boundary 156 between negative electrode winding start section and single-sided formation portion of negative electrode active material layer 156 Boundary between single-sided formation portion and double-sided formation portion of negative electrode active material layer 16 Positive electrode 161 Positive electrode winding start end portion 162 Positive electrode core 163 Positive electrode tab 1631 Positive electrode tab one end 1632 Positive electrode tab other end 164 Positive electrode winding end portion 165 166 Boundary between positive electrode winding start section and double-sided formation portion of positive electrode active material layer Boundary 167 with single-sided portion of material layer Boundary 21 between double-sided formed portion and single-sided

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Abstract

La présente invention vise à fournir une batterie secondaire à électrolyte non aqueux dans laquelle est supprimée une augmentation de l'épaisseur de batterie, laquelle augmentation dépend du cycle de charge/décharge. A cet effet, selon la présente invention, un corps d'électrode enroulé plat reçu dans une batterie secondaire à électrolyte non aqueux est configuré de telle sorte que : une languette d'électrode négative et une languette d'électrode positive sont placées à une partie où l'enroulement du corps d'électrode débute ; une couche de matière active d'électrode négative sur la première surface extérieure de l'enroulement d'électrode négative débute au premier coin depuis l'extrémité de début d'enroulement d'électrode négative, et la couche de matière active d'électrode négative sur la surface restante débute après approximativement un tour ; et lorsque le corps d'électrode est observé dans une vue en plan, les hauteurs des extrémités côté plaque de pôle à la fois de la languette d'électrode positive et de la languette d'électrode négative depuis le côté inférieur de bac du corps d'électrode sont sensiblement égales.
PCT/JP2012/074549 2011-09-30 2012-09-25 Batterie secondaire à électrolyte non aqueux WO2013047515A1 (fr)

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JP2011-216903 2011-09-30
JP2011216903 2011-09-30

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WO2013047515A1 true WO2013047515A1 (fr) 2013-04-04

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CN107546420A (zh) * 2016-06-24 2018-01-05 宁德时代新能源科技股份有限公司 卷绕式电芯
CN113767497A (zh) * 2019-04-25 2021-12-07 株式会社村田制作所 二次电池
CN114388984A (zh) * 2020-10-22 2022-04-22 泰星能源解决方案有限公司 电池
WO2022105530A1 (fr) * 2020-11-20 2022-05-27 京东方科技集团股份有限公司 Cellule enroulée, structure de batterie, dispositif d'affichage flexible et dispositif de pressage à chaud
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CN107546420A (zh) * 2016-06-24 2018-01-05 宁德时代新能源科技股份有限公司 卷绕式电芯
CN107546420B (zh) * 2016-06-24 2024-04-12 宁德时代新能源科技股份有限公司 卷绕式电芯
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