WO2012105362A1 - 非水電解液二次電池 - Google Patents
非水電解液二次電池 Download PDFInfo
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- WO2012105362A1 WO2012105362A1 PCT/JP2012/051397 JP2012051397W WO2012105362A1 WO 2012105362 A1 WO2012105362 A1 WO 2012105362A1 JP 2012051397 W JP2012051397 W JP 2012051397W WO 2012105362 A1 WO2012105362 A1 WO 2012105362A1
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- negative electrode
- electrolyte secondary
- current collecting
- secondary battery
- collecting tab
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a non-aqueous electrolyte secondary battery, and in particular, by reviewing the structure of the current collecting tab of one electrode plate, it has a high capacity and is excellent in safety and reliability even though it does not have a center pin.
- the present invention relates to a non-aqueous electrolyte secondary battery including a cylindrical one having characteristics.
- sealed batteries secondary batteries that can be charged and discharged, such as nickel metal hydride storage batteries and lithium ion secondary batteries, are often used from the viewpoint of economy.
- non-aqueous electrolyte secondary batteries represented by lithium ion secondary batteries are more frequently used because they are lighter and have higher energy density than other secondary batteries.
- rechargeable batteries are in an overcharged state in which current is supplied for longer than usual during charging, when exposed to high temperatures, or when a large current flows due to misuse or failure of equipment used, causing a short circuit. If this occurs, the electrolytic solution decomposes and gas is generated, and the internal pressure of the battery increases due to the generation of this gas. If such overcharge, high temperature exposure, or short circuit condition continues, the battery internal pressure may further increase and become dangerous. For this reason, particularly in the case of non-aqueous electrolyte secondary batteries, a battery having an explosion-proof safety valve has been used in the past.
- a positive electrode plate and a negative electrode plate that are opposed to each other with a separator sandwiched in a battery outer can are mainly used.
- a spirally wound electrode body formed in a shape having a hollow part is disposed, and a cylindrical center pin is disposed in the hollow part of this spirally wound electrode body, which occurs due to an abnormal state such as overcharge.
- the gas is guided to the safety valve through a center pin disposed in the hollow portion of the wound electrode body.
- the pressure generated by the gas generated inside the cylindrical non-aqueous electrolyte secondary battery is applied in the overlapping direction of the positive electrode plate, negative electrode plate, and separator, so the hollow part collapses and blocks the gas passage. It is provided in order not to exist.
- the center pin in a cylindrical non-aqueous electrolyte secondary battery, can be secured in the hollow part of the wound electrode body to ensure safety and reliability during abnormal conditions such as overcharge. If provided, the number of parts increases, resulting in disadvantages in productivity and cost. In addition, in recent years, further increase in battery capacity has been demanded. However, if a center pin is provided, the space for the center pin becomes a dead space, and it is difficult to increase the battery capacity.
- the negative electrode current collector tab is provided as a negative electrode core.
- a cylindrical non-aqueous electrolyte secondary battery having two windings on the winding start side and winding end side is disclosed.
- the current collecting tab provided on the winding end side after the winding electrode body is produced is bent toward the winding center, and the battery outer can
- the three layers of the current collecting tab on the winding start side, the current collecting tab on the winding end side and the battery outer can are welded and electrically connected to each other at the bottom of the inner side
- the example which formed the shape part which has elasticity in the junction part with the battery exterior can of the current collection tab of this is shown.
- Patent Document 2 According to the cylindrical non-aqueous electrolyte secondary battery disclosed in Patent Document 2, the contact area between the innermost electrode and the current collecting tab can be increased. A step of forming the same into the same radius of curvature as the core rod used in the production of the wound electrode body is required. In addition, Patent Document 2 does not suggest any electrical connection by connecting the current collecting tab to the inner bottom portion of the battery outer can.
- the current collecting tab is connected to the core body on both the winding start side and the winding end side of the wound electrode body. Therefore, even if the current collecting tab width is the same as that of the conventional example, two conductive paths between the winding start side of the core body and the battery outer can and between the winding end side of the core body and the battery outer can are secured. Therefore, a cylindrical non-aqueous electrolyte secondary battery with low internal resistance is obtained.
- a shape portion having elasticity is formed at the joining portion of the current collecting tab on the winding start side with the battery outer can, it is used for an electric vehicle (EV), a hybrid electric vehicle (HEV) or a power tool. Even when exposed to shock or vibration, as in the case, it is difficult to cause metal fatigue in the welded part, and it is suppressed that the current collecting tab is detached from the welded part and the internal resistance is increased. Excellent effect.
- the present invention has been made to solve the problems of the prior art as described above. That is, the present invention is to review the structure of the current collecting tab of the wound electrode body, so that it has a high capacity, a cylindrical shape having excellent safety and reliability, although it does not have a center pin. It aims at providing the nonaqueous electrolyte secondary battery containing.
- the non-aqueous electrolyte secondary battery of the present invention is: A positive electrode plate having a positive electrode mixture layer formed on both sides of the positive electrode core and a negative electrode plate having a negative electrode mixture layer formed on both sides of the negative electrode core are wound with a separator interposed therebetween, and the center of the winding shaft Comprising a wound electrode body in which a gap is formed, A core exposed portion is formed on the winding start side of one of the positive electrode plate and the negative electrode plate, and a first current collecting tab is joined to the core exposed portion on the winding start side,
- the wound electrode body is enclosed in a battery outer can together with a non-aqueous electrolyte, and the battery outer can is sealed by a sealing plate,
- the first current collecting tab is bent and joined so as to contact the inner bottom portion of the battery outer can at a position corresponding to the gap portion of the wound electrode body,
- the wound electrode body is formed in a shape in which the gap portion has an arc-shaped portion and a chord portion in plan view
- the first current collecting tab has a linear shape along the string portion of the core exposed portion on the winding start side in a plan view, and is joined to the core exposed portion at the string portion.
- the first current collecting tab joined to the core body exposed portion on one winding start side of the positive electrode plate or the negative electrode plate is on the gap portion side in a plan view. Since it is linear along the string part and joined at this string part, it is placed in the gap even if the wound electrode body is deformed in the radial direction due to gas generation inside the battery. Due to the three-dimensional support of the first current collecting tab, the gap portion can be prevented from being blocked. Therefore, according to the nonaqueous electrolyte secondary battery of the present invention, when the battery is overcharged or exposed to a high temperature, the wound electrode body undergoes a radial change due to gas generation inside the battery.
- the gap portion is not easily blocked, a gas flow path to the safety valve means provided in the non-aqueous electrolyte secondary battery can be secured, so that the non-aqueous electrolyte secondary battery with high safety and reliability can be secured. Can be obtained.
- the non-aqueous electrolyte secondary battery of the present invention since the center pin is not provided in the gap, the battery capacity can be increased accordingly.
- the “plan view” in the present invention refers to a state in which the wound electrode body is viewed from the extending direction of the winding axis of the wound electrode body. It is equivalent to a cross-sectional view cut along a plane perpendicular to
- a safety valve when a safety valve is provided, either a direct formation on the sealing plate, a formation inside the terminal fixed to the sealing plate, or a direct formation on the battery outer can is adopted. can do.
- the nonaqueous electrolyte secondary battery of the present invention can be employed for both a cylindrical type and an elliptical cylindrical type.
- the core rod used when forming the wound electrode body is not a cylindrical one. It can be easily formed by using a columnar body having a shape in which a string is formed in the cross section.
- “joining” in the present invention includes not only “welding” but also “pressure welding”, and “welding” includes resistance welding, ultrasonic welding, laser welding, and electron beam welding.
- the core body exposed portion is formed on the winding start side of the negative electrode plate.
- the negative electrode tab (first current collecting tab) to be joined to the negative electrode core exposed portion one made of nickel or a nickel alloy, a copper-nickel two-layer clad material or a nickel-copper-nickel three-layer clad material should be used.
- the positive electrode current collecting tab (second current collecting tab) is preferably made of aluminum.
- a carbonaceous material such as graphite or amorphous carbon
- a lithium transition metal represented by Li x MO 2 (wherein M is at least one of Co, Ni, and Mn) capable of reversibly occluding and releasing lithium ions.
- a part of the transition metal may be substituted with Zr, Mg, Al or the like.
- examples of the negative electrode active material that can be used in the non-aqueous electrolyte secondary battery of the present invention include carbon raw materials such as graphite, non-graphitizable carbon, and graphitizable carbon, LiTiO 2 , and spinel-type Li 4 Ti 5.
- examples thereof include titanium oxides such as O 12 and TiO 2 , metalloid elements such as silicon and tin, or Sn—Co alloys.
- nonaqueous solvent examples include cyclic carbonates such as ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC), and fluorinated cyclic esters.
- cyclic carbonates such as ethylene carbonate (EC), propylene carbonate (PC), and butylene carbonate (BC)
- fluorinated cyclic esters examples include fluorinated cyclic esters.
- Carbonic acid esters such as ⁇ -butyllactone (BL) and ⁇ -valerolactone (VL), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC), methyl propyl carbonate (MPC) , Chain carbonates such as dibutyl carbonate (DBC), fluorinated chain carbonates, chain carboxylates such as methyl pivalate, ethyl pivalate, methyl isobutyrate, methyl propionate, N, N '-Dimethylformamide, N- Amide compounds such as chill oxazolidinone, sulfur compounds such as sulfolane, etc.
- DMC dimethyl carbonate
- EMC ethyl methyl carbonate
- DEC diethyl carbonate
- MPC methyl propyl carbonate
- Chain carbonates such as dibutyl carbonate (DBC), fluorinated chain carbonates, chain carboxylates such as methyl pivalate
- the non-aqueous electrolyte secondary battery of the present invention is not limited to a liquid one but may be a gelled one.
- a separator used in the non-aqueous electrolyte secondary battery of the present invention a separator made of a microporous film formed from a polyolefin material such as polypropylene or polyethylene can be selected.
- a resin having a low melting point may be mixed, and further, a laminate with a high melting point resin or a resin carrying inorganic particles may be used to obtain heat resistance.
- vinylene carbonate (VC), vinylethyl carbonate (VEC), and succinic anhydride (SUCAH) are further used as a compound for stabilizing the electrode.
- a lithium salt generally used as an electrolyte salt in the nonaqueous electrolyte secondary battery can be used.
- Such lithium salts include LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , LiN (C 2 F 5 SO 2 ) 2 , LiN (CF 3 SO 2 ) (C 4 F 9 SO 2 ), LiC (CF 3 SO 2 ) 3 , LiC (C 2 F 5 SO 2 ) 3 , LiAsF 6 , LiClO 4 , Li 2 B 10 Cl 10 , Li 2 B 12 Cl 12 , and mixtures thereof Illustrated.
- LiPF 6 lithium hexafluorophosphate
- the amount of electrolyte salt dissolved in the non-aqueous solvent is preferably 0.5 to 2.0 mol / L.
- the first current collecting tab has a shape portion having elasticity between the first current collecting tab and the joint portion to the battery outer can.
- the wound electrode is generated by gas generation inside the battery when exposed to overcharge or high temperature. Even when the body changes in the radial direction, not only is the gap not easily blocked, but also the impact when a shock due to dropping, vibration, or the like is applied can be absorbed.
- the non-aqueous electrolyte secondary battery of the present invention since it can withstand the impact applied in the direction of the central axis of the wound electrode body, even if it receives a drop impact, the first The possibility of separation of the joint between the current collecting tab and the battery outer can is greatly reduced and the internal resistance of the battery is difficult to increase, and the non-aqueous electrolyte secondary solution is safer and more reliable. A battery can be obtained.
- shapes such as a bow shape, circular arc shape, a waveform shape, are employable.
- the first current collecting tab is formed of a metal having at least a hardness of HV100 or more.
- the first current collecting tab is formed of a metal having a hardness of HV100 or more, the physical strength of the first current collecting tab is extremely high. It can withstand the change in the radial direction of the wound electrode body and the impact applied in the central axis direction, so that a non-aqueous electrolyte secondary battery with higher safety and reliability can be obtained. Be able to. Note that when the HV is less than 100, the void portion when the wound electrode body undergoes a radial change due to gas generation inside the battery, such as when it is exposed to overcharge or high temperature. This is not preferable because the shape retention ability is lowered.
- a core body exposed portion is also formed on the winding end side of the one electrode plate, and a core body exposed portion on the winding end side of the one electrode plate is 3 current collecting tabs are joined, and the third current collecting tab is bent so as to contact the inner bottom of the battery outer can at a position corresponding to the gap of the wound electrode body, It is preferable that the current collecting tab and the inner bottom portion of the battery outer can are integrally joined together.
- the first current collecting tab is used to place the core exposed portion at the start of winding and the battery outer can.
- the third current collecting tab a total of two conductive paths are secured between the core exposed portion at the end of winding and the battery outer can, so that the non-aqueous electrolyte secondary battery having a smaller internal resistance can be obtained. can get.
- FIG. 1A is a development view of a positive electrode plate used in the nonaqueous electrolyte secondary battery of each example and comparative example
- FIG. 1B is a development view of the negative electrode plate
- FIG. 1C is used in each example.
- FIG. 1D is a plan view of the core rod used in each comparative example.
- 2A is a longitudinal sectional view of the nonaqueous electrolyte secondary battery of Example 1
- FIG. 2B is a sectional view taken along the line IIB-IIB in FIG. 2A
- 3A is a longitudinal sectional view of the nonaqueous electrolyte secondary battery of Example 2
- FIG. 3B is a sectional view taken along line IIIB-IIIB in FIG. 3A.
- FIG. 4A is a longitudinal sectional view of the nonaqueous electrolyte secondary battery of Comparative Example 1
- FIG. 4B is a sectional view taken along the line IVB-IVB of FIG. 4A
- 5A is a longitudinal sectional view of the nonaqueous electrolyte secondary battery of Comparative Example 2
- FIG. 5B is a sectional view taken along the line VB-VB of FIG. 5A.
- FIG. 1A is a development view of the positive electrode plate used in the non-aqueous electrolyte secondary battery of each example and comparative example
- FIG. 1B is a development view of the negative electrode plate
- FIG. 1C is each example.
- FIG. 1D is a plan view of a core rod used in each comparative example.
- the positive electrode plate 11 was produced as follows. First, 90 parts by mass of a positive electrode active material in which nickel cobalt lithium manganate (LiNi 1/3 Co 1/3 Mn 1/3 O 2 ) and a spinel type lithium manganate as a positive electrode active material were mixed at a mass ratio of 1: 1. Then, 5 parts by mass of graphite as a conductive agent and 5 parts by mass of polyvinylidene fluoride (PVdF) as a binder were dispersed in N-methyl-2-pyrrolidone to prepare a positive electrode mixture slurry.
- a positive electrode active material in which nickel cobalt lithium manganate (LiNi 1/3 Co 1/3 Mn 1/3 O 2 ) and a spinel type lithium manganate as a positive electrode active material were mixed at a mass ratio of 1: 1. Then, 5 parts by mass of graphite as a conductive agent and 5 parts by mass of polyvinylidene fluoride (PVdF) as a binder were dispersed in
- the positive electrode mixture slurry is applied to both surfaces of the positive electrode core body 11a made of aluminum foil having a thickness of 20 ⁇ m so that the central portion and the winding end side end portion of the positive electrode core body 11a are exposed. Then, after removing the organic solvent, the roll was pressed so that the thickness of the portion where the positive electrode mixture layer 11d was formed was 100 ⁇ m. Next, a positive electrode current collector tab 11e made of aluminum metal having a width of 3 mm and a thickness of 0.15 mm was attached to the central positive electrode core exposed portion 11b of the positive electrode core 11a by ultrasonic welding to obtain a positive electrode plate 11 (FIG. 1A).
- the negative electrode plate 12 was produced as follows. First, 98% by mass of artificial graphite powder as a negative electrode active material and 1% by mass of carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) as binders were mixed, kneaded by adding water, A mixture slurry was prepared. Next, the negative electrode mixture slurry is applied to both surfaces of the negative electrode core 12a made of copper foil having a thickness of 15 ⁇ m so that both the winding start side end and the winding end side end of the negative electrode core 12a are exposed. Then, it was passed through a dryer and dried, and then rolled using a roll press so that the thickness of the negative electrode mixture layer 12d was 100 ⁇ m.
- CMC carboxymethylcellulose
- SBR styrene-butadiene rubber
- FIG. 1C The shape of the core rod 13A used in Examples 1 and 2 in plan view is shown in FIG. 1C, and the shape of the core rod 13B used in Comparative Examples 1 and 2 in plan view is shown in FIG. 1D.
- the winding was performed such that the negative electrode current collecting tab 12e 1 on the winding start side was in contact with the flat portion 13b of the core bar 13A. That is, the cylindrical wound electrode body 14 of Examples 1 and 2 is formed in a shape in which the gap 18 has an arcuate portion and a chord portion in plan view, and the negative electrode current collecting tab 12e 1 on the winding start side is In a plan view, it is linear along the string portion of the winding start side negative electrode core exposed portion 12b, and is joined to the winding start side negative electrode core exposed portion 12b at the string portion. Further, in both Examples 1 and 2 and Comparative Examples 1 and 2, the length of the winding start side negative electrode core exposed portion 12b located on the innermost peripheral side was set to be one or more rounds of the outer periphery of the gap portion 18. .
- a non-aqueous mixed solvent was prepared so as to be 15% by volume of ethylene carbonate (EC), 10% by volume of propylene carbonate (PC) and 75% by volume of dimethyl carbonate (DMC), and a ratio of 1.0 mol / L of LiPF 6 was added thereto. What was melt
- Insulating plates 15 and 16 having a hole in the center are arranged above and below the wound electrode body 14 produced as described above, and the negative electrode current collecting tab 12e 2 on the winding end side of the negative electrode plate 12 is placed at the tip.
- the negative electrode current collecting tab 12e 1 on the winding start side of the negative electrode plate 12 is attached to the winding inner side surface of the winding start side negative electrode core exposed portion 12b so as to be linear in a plan view, and the tip is attached to the battery exterior. It was bent so as to be parallel to the bottom of the can 17 and overlapped with the tip of the current collecting tab 12e 2 on the winding end side.
- the wound electrode body 14 provided with the negative electrode current collecting tabs 12e 1 and 12e 2 bent in this manner was inserted into the cylindrical battery outer can 17 as shown in FIG. 2A.
- the negative electrode current collecting tabs 12e 1 and 12e 2 were fixed to the inside of the bottom of the battery outer can 17 by resistance welding at the same time.
- the tip of the positive electrode current collecting tab 11e is ultrasonically welded to the positive electrode terminal 20 attached to the insulating sealing plate 19, and the nonaqueous electrolyte is injected into the battery outer can and vacuum-impregnated.
- the nonaqueous electrolyte secondary battery 10A of Example 1 was manufactured by sandwiching the periphery of the plate 19 with the gasket 21 and crimping and fixing the opening end of the battery outer can 17.
- the nonaqueous electrolyte secondary battery 10A of Example 1 had a diameter of 18 mm, a length of 65 mm, and a design capacity of 1250 mAh.
- the non-aqueous electrolyte secondary battery 10B of Example 2 is configured such that the negative electrode current collecting tab 12e 1 on the winding start side used in Example 1 has a bow-shaped portion 12f when the battery is sealed. Is formed by ultrasonic welding to the outer surface of the negative electrode core exposed portion 12b of the innermost negative electrode plate 12, and the other configuration is the non-aqueous electrolyte of the first embodiment. It was produced in the same manner as in the case of the secondary battery 10A.
- the nonaqueous electrolyte secondary battery 10C of Comparative Example 1 has the negative electrode current collecting tab 12e 1 in the negative electrode current collecting tab 12e 1 on the winding start side used in Example 1.
- the contact area between the innermost negative electrode plate 12 and the negative electrode current collecting tab 12e 1 is molded to the same radius of curvature as the core rod 13B (see FIG. 1D) used when the wound electrode body 14 is manufactured. Is made by ultrasonic welding to the wound outer surface of the negative electrode core exposed portion 12b of the innermost negative electrode plate 12, and the other configuration is the non-aqueous electrolyte secondary of Example 1
- the battery 10A was manufactured in the same manner.
- the nonaqueous electrolyte secondary battery 10D of Comparative Example 2 has a length of 60 mm and an outer diameter in the gap 18 of the nonaqueous electrolyte secondary battery 10C of Comparative Example 1.
- a center pin 22 made of a stainless steel hollow pipe having a thickness of 3 mm and a thickness of 0.15 mm was inserted, and other configurations were made in the same manner as in the case of the nonaqueous electrolyte secondary battery 10C of Comparative Example 1.
- the spirally wound electrode body 14 expands in the same direction as the heating direction, that is, acts to reduce the gap 18, but for heating from a direction parallel to the negative electrode current collecting tab 12 e 1 , because they act as a pressing force in the width direction of the anode current collector 12e 1, since it is difficult bending the anode current collector 12e 1, indicates that exhibits an excellent withstand voltage effect, from the direction perpendicular to the negative electrode current collector tabs 12e 1 This shows that the negative electrode current collecting tab 12e 1 is easily bent into a curved shape, so that the improvement of the pressure resistance effect was not observed.
- the non-aqueous electrolyte secondary battery 10B of the second embodiment and also exerts an excellent effect in any of the heating from the heating and perpendicular from a direction parallel to the negative electrode current collector tab 12e 1.
- the negative electrode current collecting tab 12e 1 is formed with a bow-shaped portion 12f, so that the negative electrode current collecting tab 12e 1 bends in a curved shape even when heated from a direction perpendicular to the negative electrode current collecting tab 12e 1. Since it becomes difficult, it seems that the above effect was produced.
- the elastic shape of the current collecting tab is a bowed shape 12f
- an arc shape, a corrugated shape, or the like may be used.
- the negative electrode current collector tab is formed on the winding start side of the negative electrode plate so that the negative electrode plate is on the innermost peripheral side.
- the arrangement of the electrode plates may be reversed, and the positive electrode current collecting tab may be formed on the positive electrode plate so that the winding start side of the positive electrode plate is the innermost peripheral side.
- the charge capacity ratio (negative electrode charge capacity / positive electrode charge capacity) at a portion where the positive electrode plate and the negative electrode plate face each other is generally 1 Since the negative electrode plate is positioned on the innermost peripheral side, the negative electrode plate can be wound so that it is also positioned on the outermost peripheral side. Therefore, the charge capacity ratio of the negative electrode plate can be easily made larger than the charge capacity ratio of the positive electrode plate.
- Nonaqueous electrolyte secondary battery 11 Positive electrode plate 11a: Positive electrode core body 11b: Central side positive electrode core exposed part 11c: End of winding side positive electrode core exposed part 11d: Positive electrode mixture layer 11e: Positive electrode collection collector tabs 12: negative electrode plate 12a: negative electrode substrate 12b: winding start-side negative electrode substrate exposed portion 12c: winding end-side negative electrode substrate exposed portion 12d: the negative electrode mixture layer 12e 1, 12e 2: negative electrode current collector tab 12f: Arc-shaped portion 13: Core rod 14: Winding electrode body 15, 16: Insulating plate 17: Battery outer can 18: Gap portion 19: Sealing plate 20: Positive electrode terminal 21: Gasket 22: Center pin
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Abstract
Description
正極芯体の両面に正極合剤層が形成された正極極板と負極芯体の両面に負極合剤層が形成された負極極板とがセパレータを挟んで巻回され、巻回軸の中心に空隙部が形成された巻回電極体を備え、
前記正極極板及び負極極板の一方の極板の巻き始め側には芯体露出部が形成され、前記巻き始め側の芯体露出部に第1の集電タブが接合され、
前記巻回電極体は非水電解液と共に電池外装缶内に封入され、前記電池外装缶は封口板によって封止され、
前記第1の集電タブが前記巻回電極体の前記空隙部に対応する位置で電池外装缶の内側底部に当接するように折り曲げられて接合され、
前記正極極板及び負極極板の他方の極板に形成された芯体露出部に接合された第2の集電タブが前記封口板に固定された端子に電気的に接続されている非水電解液二次電池において、
前記巻回電極体は平面視で前記空隙部が円弧状部分と弦部分とを有する形状に形成され、
前記第1の集電タブは、平面視で前記巻き始め側の芯体露出部の前記弦部分に沿った直線状とされ、前記弦部分で前記芯体露出部に接合されていることを特徴とする。
正極極板11は次のようにして作製した。まず、正極活物質としてのニッケルコバルトマンガン酸リチウム(LiNi1/3Co1/3Mn1/3O2)とスピネル型マンガン酸リチウムを質量比1:1で混合した正極活物質90質量部と、導電剤としての黒鉛5質量部と結着剤としてのポリビニリデンフルオライド(PVdF)5質量部とをN-メチル-2-ピロリドンに分散させ、正極合剤スラリーを調製した。次に、厚さ20μmのアルミニウム箔からなる正極芯体11aの両面に、正極芯体11aの中央部及び巻き終わり側端部が露出するように、正極合剤スラリーを塗工し、乾燥機内に通して上記有機溶剤を除去した後、ロールプレス機を用いて正極合剤層11dが形成された部分の厚さが100μmとなるように圧延した。次いで、正極芯体11aの中央側正極芯体露出部11bに、幅3mm、厚み0.15mmのアルミニウム金属製の正極集電タブ11eを超音波溶接により取り付け、正極極板11を得た(図1A参照)。
負極極板12は次のようにして作製した。まず、負極活物質としての人造黒鉛粉末98質量%と、結着剤としてのカルボキシメチルセルロース(CMC)及びスチレン-ブタジエンゴム(SBR)をそれぞれ1質量%ずつ混合し、水を加えて混練して負極合剤スラリーを調製した。次に、厚さが15μmの銅箔からなる負極芯体12aの両面に、負極芯体12aの巻き始め側端部及び巻き終わり側端部の両面が露出するように、負極合剤スラリーを塗工し、次いで乾燥機内に通して乾燥した後、ロールプレス機を用いて負極合剤層12dの厚さが100μmとなるように圧延した。
実施例1及び2で用いた芯棒13Aの平面視の形状を図1Cに、比較例1及び2で用いた芯棒13Bの平面視の形状を図1Dに示す。上記のようにして作製された正極極板11と負極極板12と例えばポリエチレン樹脂からなる厚さ22μmの微多孔性セパレータ(図示省略)とを、それぞれ巻き始め側を巻き取り機(図示省略)に取り付けられた芯棒13A又は13Bのスリット13aに差し込んで、芯棒13A又は13Bの回りに巻き付けて巻回し、巻き終わり部に絶縁性の巻き止めテープを取り付けて固定した後、芯棒13A及び13Bを取り除いて、実施例1、2及び比較例1、2の非水電解液二次電池10A~10Dで使用する円筒状巻回電極体14を完成させた。
エチレンカーボネート(EC)15体積%、プロピレンカーボネート(PC)10体積%及びジメチルカーボネート(DMC)75体積%となるように非水混合溶媒を調製し、これにLiPF6を1.0mol/Lの割合となるように溶解したものを非水電解液とした。
上記のようにして作製された巻回電極体14の上下に中央に穴が開けられた絶縁板15及び16を配置し、負極極板12の巻き終わり側の負極集電タブ12e2を先端部が電池外装缶17の底部に平行になるように適切な位置で折り曲げた。また、負極極板12の巻き始め側の負極集電タブ12e1は、巻き始め側負極芯体露出部12bの巻き内側面に平面視で直線状になるように取り付けられ、先端部を電池外装缶17の底部に平行になるようにかつ巻き終わり側の集電タブ12e2の先端部に重畳するように折り曲げた。このように折り曲げられた負極集電タブ12e1及び12e2を備えた巻回電極体14を、図2Aに示したように、円筒状の電池外装缶17内に挿入した。次いで、電池外装缶17の底部の内側に負極集電タブ12e1及び12e2を同時に抵抗溶接することによって固定した。
実施例2の非水電解液二次電池10Bは、図3A及び図3Bに示すように、実施例1で使用した巻き始め側の負極集電タブ12e1を、電池の封口時に弓なり形状部分12fが形成されるように折り曲げて、最内周側の負極極板12の負極芯体露出部12bの巻き外側面に超音波溶接したものであり、その他の構成は実施例1の非水電解液二次電池10Aの場合と同様にして作製した。
比較例1の非水電解液二次電池10Cは、図4A及び図4Bに示したように、実施例1で使用した巻き始め側の負極集電タブ12e1において、負極集電タブ12e1を巻回電極体14の作製時に使用される芯棒13B(図1D参照)と同じ曲率半径に成形加工し、最内周側の負極極板12と負極集電タブ12e1との間の接触面積が大きくなるようにして、最内周側の負極極板12の負極芯体露出部12bの巻き外側面に超音波溶接したものであり、その他の構成は実施例1の非水電解液二次電池10Aの場合と同様にして作製した。
比較例2の非水電解液二次電池10Dは、図5A及び図5Bに示したように、比較例1の非水電解液二次電池10Cの空隙部18内に、長さ60mm、外径3mm、厚さ0.15mmのステンレススチール製の中空パイプからなるセンターピン22を挿入し、その他の構成は比較例1の非水電解液二次電池10Cの場合と同様にして作製した。
上述のようにして作製された実施例1、2及び比較例1、2の非水電解液二次電池10A~10Dのそれぞれ20個ずつ、過充電状態を模するために、充電電流1It=1250mAの低電流で電池電圧が4.25Vとなるまで充電し、電池電圧が4.25Vに達した後は4.25Vの定電圧で電流が1/50It=25mAに成るまで充電した。このように過充電状態とされた各電池の側面に対し、図2Bに示したように、負極集電タブに対して、それぞれ10個については平行な方向から、また、それぞれ10個について垂直な方向から、ブンゼンバーナーを用いて10分間加熱した。そして、それぞれの電池について、破裂状態の有無を視認することにより測定した。結果をまとめて表1に示した。
Claims (4)
- 正極芯体の両面に正極合剤層が形成された正極極板と負極芯体の両面に負極合剤層が形成された負極極板とがセパレータを挟んで巻回され、巻回軸の中心に空隙部が形成された巻回電極体を備え、
前記正極極板及び負極極板の一方の極板の巻き始め側には芯体露出部が形成され、前記巻き始め側の芯体露出部に第1の集電タブが接合され、
前記巻回電極体は非水電解液と共に電池外装缶内に封入され、前記電池外装缶は封口板によって封止され、
前記第1の集電タブが前記巻回電極体の前記空隙部に対応する位置で電池外装缶の内側底部に当接するように折り曲げられて接合され、
前記正極極板及び負極極板の他方の極板に形成された芯体露出部に接合された第2の集電タブが前記封口板に固定された端子に電気的に接続されている非水電解液二次電池において、
前記巻回電極体は平面視で前記空隙部が円弧状部分と弦部分とを有する形状に形成され、
前記第1の集電タブは、平面視で前記巻き始め側の芯体露出部の前記弦部分に沿った直線状とされ、前記弦部分で前記芯体露出部に接合されていることを特徴とする非水電解液二次電池。 - 前記第1の集電タブは、前記電池外装缶への接合部分との間に弾性を有する形状部分を備えていることを特徴とする請求項1に記載の非水電解液二次電池。
- 前記第1の集電タブは、少なくとも硬度がHV100以上の金属によって形成されていることを特徴とする請求項1に記載の非水電解液二次電池。
- 前記一方の極板の巻き終わり側にも芯体露出部が形成され、前記一方の極板の巻き終わり側の芯体露出部に第3の集電タブが接合され、前記第3の集電タブは前記巻回電極体の前記空隙部に対応する位置で前記電池外装缶の内側底部に当接するように折り曲げられ、前記第1の集電タブ及び前記電池外装缶の内側底部と共に一体に接合されていることを特徴とする請求項1~3のいずれかに記載の非水電解液二次電池。
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015017281A (ja) * | 2013-07-08 | 2015-01-29 | 日本発條株式会社 | 導電部材および導電部材の製造方法 |
JP2015017282A (ja) * | 2013-07-08 | 2015-01-29 | 日本発條株式会社 | 積層体および積層体の製造方法 |
KR20160050702A (ko) * | 2014-10-30 | 2016-05-11 | 삼성에스디아이 주식회사 | 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지 |
WO2016098291A1 (ja) * | 2014-12-16 | 2016-06-23 | 三洋電機株式会社 | 円筒形電池 |
US10347897B2 (en) * | 2013-09-27 | 2019-07-09 | Lg Chem, Ltd. | Secondary battery with electrode tab made of copper-nickel alloy |
WO2023163139A1 (ja) * | 2022-02-28 | 2023-08-31 | パナソニックエナジ-株式会社 | 円筒形の非水電解質二次電池 |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5849234B2 (ja) * | 2011-09-14 | 2016-01-27 | パナソニックIpマネジメント株式会社 | 非水電解質二次電池 |
KR20140139181A (ko) * | 2013-05-27 | 2014-12-05 | 삼성에스디아이 주식회사 | 이차 전지 |
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USD772806S1 (en) | 2014-11-26 | 2016-11-29 | Techtronic Industries Co. Ltd. | Battery |
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KR102355109B1 (ko) | 2017-12-21 | 2022-01-25 | 주식회사 엘지에너지솔루션 | 용접용 기둥을 포함하는 원통형 이차전지 |
CN110364768B (zh) * | 2019-06-11 | 2021-05-21 | 温州大学新材料与产业技术研究院 | 一种多卷芯电池制作方法 |
KR20210041454A (ko) * | 2019-10-07 | 2021-04-15 | 주식회사 엘지화학 | 전극조립체 및 그 제조방법 |
CN114447443A (zh) * | 2022-02-11 | 2022-05-06 | 宁德新能源科技有限公司 | 电化学装置、电化学装置的制造方法及用电设备 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006134758A (ja) * | 2004-11-08 | 2006-05-25 | Sony Corp | 二次電池 |
JP2006310283A (ja) * | 2005-04-25 | 2006-11-09 | Samsung Sdi Co Ltd | 円筒状のリチウム二次電池及びその製造方法 |
JP2009170365A (ja) * | 2008-01-18 | 2009-07-30 | Sanyo Electric Co Ltd | 密閉電池 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5786265U (ja) * | 1980-11-14 | 1982-05-27 | ||
JPS6059667A (ja) * | 1983-09-08 | 1985-04-06 | Sanyo Electric Co Ltd | 渦巻電極体の製造方法 |
US5017442A (en) * | 1988-03-19 | 1991-05-21 | Hitachi Maxell, Ltd. | Coiled lithium battery |
JP2764958B2 (ja) * | 1988-11-11 | 1998-06-11 | 松下電器産業株式会社 | 円筒形二次電池 |
US4975095A (en) * | 1989-07-28 | 1990-12-04 | Gates Energy Products, Inc. | Method of winding an electrochemical cell and cell produced by the method |
JP3259995B2 (ja) | 1992-12-24 | 2002-02-25 | 東芝電池株式会社 | 非水電解液電池の製造方法 |
JP3536391B2 (ja) * | 1994-12-19 | 2004-06-07 | ソニー株式会社 | 巻回電極素子体及びその製造方法並びに巻回電極素子体を用いた電池の製造方法 |
JP3379282B2 (ja) * | 1995-05-22 | 2003-02-24 | 松下電器産業株式会社 | 電池用電極体の製造装置および製造方法 |
JP4580620B2 (ja) * | 2002-03-13 | 2010-11-17 | パナソニック株式会社 | 電池に用いる渦巻状電極群の製造方法 |
JP2004349141A (ja) * | 2003-05-23 | 2004-12-09 | Sanyo Electric Co Ltd | 扁平巻回電極体を備えた電池及びその製造方法 |
TWI291778B (en) | 2004-11-08 | 2007-12-21 | Sony Corp | Secondary battery |
JP2006139918A (ja) | 2004-11-10 | 2006-06-01 | Hitachi Maxell Ltd | 筒形非水電解液電池 |
KR100731452B1 (ko) * | 2005-12-29 | 2007-06-21 | 삼성에스디아이 주식회사 | 원통형 전지의 극판 권취장치 및 권취방법 |
JP4968768B2 (ja) | 2006-03-17 | 2012-07-04 | 日立マクセルエナジー株式会社 | 筒形非水電解液電池 |
JP5054419B2 (ja) * | 2006-07-06 | 2012-10-24 | エナックス株式会社 | シート状二次電池 |
-
2012
- 2012-01-24 WO PCT/JP2012/051397 patent/WO2012105362A1/ja active Application Filing
- 2012-01-24 US US13/981,192 patent/US9350042B2/en active Active
- 2012-01-24 JP JP2012555805A patent/JP6058400B2/ja active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006134758A (ja) * | 2004-11-08 | 2006-05-25 | Sony Corp | 二次電池 |
JP2006310283A (ja) * | 2005-04-25 | 2006-11-09 | Samsung Sdi Co Ltd | 円筒状のリチウム二次電池及びその製造方法 |
JP2009170365A (ja) * | 2008-01-18 | 2009-07-30 | Sanyo Electric Co Ltd | 密閉電池 |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015017281A (ja) * | 2013-07-08 | 2015-01-29 | 日本発條株式会社 | 導電部材および導電部材の製造方法 |
JP2015017282A (ja) * | 2013-07-08 | 2015-01-29 | 日本発條株式会社 | 積層体および積層体の製造方法 |
US10347897B2 (en) * | 2013-09-27 | 2019-07-09 | Lg Chem, Ltd. | Secondary battery with electrode tab made of copper-nickel alloy |
KR20160050702A (ko) * | 2014-10-30 | 2016-05-11 | 삼성에스디아이 주식회사 | 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지 |
KR102307979B1 (ko) | 2014-10-30 | 2021-09-30 | 삼성에스디아이 주식회사 | 리튬 이차 전지용 음극 및 이를 포함하는 리튬 이차 전지 |
WO2016098291A1 (ja) * | 2014-12-16 | 2016-06-23 | 三洋電機株式会社 | 円筒形電池 |
JPWO2016098291A1 (ja) * | 2014-12-16 | 2017-09-28 | 三洋電機株式会社 | 円筒形電池 |
US10461304B2 (en) | 2014-12-16 | 2019-10-29 | Sanyo Electric Co., Ltd. | Cylindrical battery |
WO2023163139A1 (ja) * | 2022-02-28 | 2023-08-31 | パナソニックエナジ-株式会社 | 円筒形の非水電解質二次電池 |
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