JP2009187768A - Nonaqueous electrolyte battery and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery that prevents tension and extension or wrinkle and twist of electrode terminals taken out of a battery element having a lamination structure, while improving the space efficiency. <P>SOLUTION: A battery element is manufactured by folding an electrode terminals 3a and 3d that are electrically connected with each other with a required sag held beforehand in the approximately U-shaped form, and is packed with a film-like package. Such a sag is given an optimal U-shaped bending form by U-shaped bending so that the electrode terminal may be in the approximately U-shaped form by moving a plate-like member vertically to the electrode terminal to form a bending part and then by moving a roller 22 along the electrode terminal in the direction opposite to the plate-like member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a nonaqueous electrolyte battery and a method for manufacturing the same, and more particularly to a nonaqueous electrolyte battery having a laminated structure and a method for manufacturing the same.

  In recent years, electronic devices such as mobile phones and notebook personal computers have become cordless and portable, and thin, small, and lightweight portable electronic devices have been developed one after another. In addition, the amount of power used is increasing due to diversification of devices and functions, and there is an increasing demand for higher capacity and weight reduction of batteries, which are energy sources for these electronic devices. Therefore, in order to meet this demand, various proposals have been made regarding laminated nonaqueous electrolyte batteries, particularly lithium ion secondary batteries using lithium ion doping / undoping.

  For example, a stacked battery in which a plurality of positive electrodes and negative electrodes are alternately stacked via separators is used. In such a battery, a plurality of positive electrodes having a positive electrode active material layer provided on both sides of a positive electrode current collector and a plurality of negative electrodes having a negative electrode active material layer provided on both sides of a negative electrode current collector are separators. The battery is charged and discharged by passing lithium ions through the separator.

  From one side of such a positive electrode, for example, a positive electrode terminal formed integrally with the positive electrode current collector is drawn out. Similarly, a negative electrode terminal formed integrally with the negative electrode current collector is drawn out from one side of the negative electrode.

  In a nonaqueous electrolyte battery having a battery element having a stacked structure, it is necessary to connect a plurality of positive electrode terminals drawn from a plurality of positive electrodes together by a method such as ultrasonic welding. Similarly, a plurality of negative terminals are connected together. Thereafter, the connected positive electrode terminal and negative electrode terminal are bent, and the tip portions of the positive electrode terminal and the negative electrode terminal are connected to a circuit board on which an electronic component such as a protection circuit is mounted, a lead connected to the protection circuit, or the like.

  Conventionally, a positive electrode terminal and a negative electrode terminal (hereinafter referred to as electrode terminals as appropriate) have been used to connect the electrode terminals together and to bend and fold the electrode terminals to increase the space efficiency. For example, as shown in side views in FIGS. 15A to 15C, the other negative terminals 112 b to 112 d are combined with the negative terminal 112 a drawn from the negative electrode 102 disposed on the bottom surface of the stacked battery element 100. Then, the negative terminals 112a to 112d and the lead member 114 disposed in contact with, for example, the negative terminal 112d are fixed by, for example, ultrasonic welding.

  Then, the lead member 114 is bent, and the fixed negative terminals 112a to 112d are bent using the point F in FIG. 15B as a fulcrum.

  16A to 16C, the negative terminals 112a to 112d may be bent while moving the fulcrum F of FIG. 16B to the fulcrum F ′ of FIG. 16C.

  Although not shown in FIGS. 15A to 15C and FIGS. 16A to 16C, the positive terminal is fixed and bent to another lead member in the same manner as the negative terminals 12a to 12d.

Patent Document 1 below describes a stacked lithium ion battery in which electrode terminals are fixed by other methods.
JP 2007-234466 A

  In Patent Document 1, as shown in FIG. 17A, a plurality of positive electrodes 101 and negative electrodes 102 are alternately stacked via separators 103, and then the stacked portions of the electrodes are curved as shown in FIG. 17B. Thereby, the one end of the positive electrode 101 and the negative electrode 102 is arrange | positioned so that it may shift | deviate little by little. Then, as shown in FIG. 17C, a plurality of positive terminals (not shown) drawn from the positive electrode 101 and a plurality of negative terminals 112 drawn from the negative electrode 102 are fixed together. At this time, the negative terminal 112 is fixed together with other lead members 114, for example. Similarly, the positive terminal is bonded to the lead member 114. Subsequently, the curved laminated portion is returned to a flat plate shape, and the negative electrode terminal 112 bonded to the lead member 114 is bent into a predetermined shape.

  These laminated battery elements are packaged with a film-like packaging material such as a laminated film, for example, and the periphery of the laminated battery element is sealed to form a nonaqueous electrolyte battery.

  However, in the nonaqueous electrolyte battery using the method described in FIG. 15 and FIG. 16, after the electrode terminals are fixed together so as to extend in a direction parallel to the electrodes, the fixed portions of the electrode terminals are perpendicular to the electrodes. The quality of the electrode terminal is deteriorated by bending the electrode terminal. That is, in the method of fixing the fulcrum F shown in FIG. 15, the electrode terminal on the bent outer peripheral side is greatly pulled or stretched. Further, in the method of moving the fulcrum F to the fulcrum F ′ shown in FIG. 16, the electrode terminal is not pulled or stretched, but the electrode terminal on the bent inner peripheral side is wrinkled or twisted.

  In Patent Document 1 described above, it is necessary to bend the positive electrode 101 and the negative electrode 102 in which the active material layer is formed on the current collector. For this reason, the active material layer is rubbed or stretched mainly at the curved portions of the positive electrode 101 and the negative electrode 102, and the active material layer is peeled off and peeled off from the current collector. There is a possibility that the positive electrode 101 and the negative electrode 102 may be short-circuited due to the material layer breaking through the separator.

  When the method of Patent Document 1 is used, it is possible to bend the electrode terminal without applying a tensile stress to the electrode terminal, but there is a gap between the bent portion of the electrode terminal and the laminate in which the electrodes are laminated. This is undesirable in terms of space efficiency. In addition, an electrode terminal having a predetermined length is connected to the lead member 114 such that the tip is substantially at the same position. For this reason, it is not preferable that the electrode terminal fixing part is brought close to the laminated body in order to improve the space efficiency, because a part of the electrode terminal is projected in the laminated body thickness direction.

  In such a non-aqueous electrolyte battery, for example, as the number of the positive electrode 101 and the negative electrode 102 stacked for increasing the capacity or discharging a large current is increased, the quality of the electrode terminal or the like is liable to occur.

  Accordingly, an object of the present invention is to provide a non-aqueous electrolyte battery that can be bent and improve space efficiency without causing poor quality of the electrode terminal and a decrease in battery safety, and a method for manufacturing the same. And

  In order to solve the above-described problems, the first invention provides a positive electrode in which a positive electrode active material layer is formed on both sides of a positive electrode current collector, and a negative electrode active material in which a negative electrode active material layer is formed on both sides of the negative electrode current collector. In a non-aqueous electrolyte battery in which battery elements alternately stacked with separators are covered with an exterior material, each of the battery elements is electrically connected to a plurality of positive electrode current collectors, and each tip portion is substantially the same as the surface of the positive electrode. A plurality of positive terminals fixed to each other in a state in which a large slack is formed on the bent portion at the bent portion when aligned in a parallel direction, and a plurality of negative current collectors are electrically connected to each other, and a tip portion Are arranged in a direction substantially parallel to the surface of the negative electrode, and a plurality of negative terminals fixed to each other in a state where a large slack is formed in the bent portion on the bent outer peripheral side, and the positive electrode terminal and the negative electrode terminal are , Each so that the cross-section is substantially U-shaped Gerare Te is a non-aqueous electrolyte battery, characterized by U-shaped bent portion is formed.

  In the non-aqueous electrolyte battery described above, it is preferable that the curvatures of the opposing surfaces of two adjacent positive electrode terminals are substantially equal in the U-shaped bent portion.

  Further, the positive electrode terminal and the positive electrode current collector are preferably configured integrally, and the negative electrode terminal and the negative electrode current collector are preferably configured integrally.

  It is preferable that the positive electrode terminal and the negative electrode terminal are electrically connected to the first lead member and the second lead member, respectively, and are connected by resistance welding, ultrasonic welding, clamp fixing, or caulking.

  Moreover, it is preferable that the above-mentioned exterior material is film-shaped exterior materials, such as a laminate film, at the point which the volume efficiency of a nonaqueous electrolyte battery improves.

  In addition, the second invention is a positive electrode in which a positive electrode active material layer is formed on both surfaces of a positive electrode current collector formed integrally with a positive electrode terminal, and a negative electrode active material layer on both surfaces of a negative electrode current collector formed integrally with a negative electrode terminal. Laminating step of alternately laminating negative electrodes formed with a separator, a first U-bending step of bending each of the plurality of positive and negative electrode terminals into a substantially U-shaped cross section, and a substantially U-shaped The positive terminal is deformed into a substantially L shape so that the tip of the positive terminal bent to be substantially parallel to the positive electrode, and a first sagging that increases toward the outer periphery of the bent portion of the positive terminal is provided. A positive electrode terminal cutting step of cutting and aligning the tip portions of the plurality of positive electrode terminals while maintaining the first slack, and the negative electrode terminals are substantially parallel to the negative electrode so that the tip portions of the negative electrode terminals bent into a substantially U shape are substantially parallel to the negative electrode. Deformed into an L shape, negative electrode end A negative terminal cutting step of providing a second sagging that increases as it goes toward the outer periphery of the bending at the bent portion, and trimming the tips of the plurality of negative terminals while holding the second sagging, and the tip of the positive terminal A connecting step for electrically connecting the first lead member and the second lead member to the first lead member and the second lead member, respectively, and bending the first lead member and the second lead member in desired directions, respectively. A non-aqueous electrolyte battery manufacturing method comprising: a lead member bending step; and a second U-bending step of deforming a positive electrode terminal and a negative electrode terminal to form a U-shaped bent portion again.

  In the first U-shaped bending step, the plate-shaped member is moved perpendicularly to the positive electrode terminal or the negative electrode terminal, the plate-shaped member is moved to a predetermined position to form a bent portion on the positive electrode terminal or the negative electrode terminal, It is preferable that the roller is moved in the direction opposite to the moving direction of the plate member along the bending outer peripheral side of the positive electrode terminal or the negative electrode terminal to bend the positive electrode terminal or the negative electrode terminal into a substantially U-shaped cross section.

  Further, in the connecting step, it is preferable to perform connection while maintaining the first sag and the second sag respectively.

  In the connecting step, it is preferable that the tip portion of the positive electrode terminal and the tip portion of the negative electrode terminal are fixed to the first lead member and the second lead member by resistance welding or ultrasonic welding.

  According to the present invention, the space efficiency in the electrode terminal lead-out portion and the prevention of wrinkles and kinking of the electrode terminal can be compatible, and the reliability of the nonaqueous electrolyte battery can be improved.

(1-1) Configuration of Nonaqueous Electrolyte Battery Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following, in the nonaqueous electrolyte battery or battery element, the lead-out sides of the positive electrode terminal and the negative electrode terminal are the top portion, the side facing the top portion is the bottom portion, and the side portion sandwiched between the top portion and the bottom portion is the side portion. Is referred to as appropriate.

  FIG. 1A is a schematic diagram showing an external appearance of a lithium ion secondary battery (hereinafter appropriately referred to as a secondary battery) 1 which is a nonaqueous electrolyte battery according to an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a configuration of a battery 1. FIG. FIG. 1B shows a configuration when the bottom surface and top surface of the secondary battery 1 shown in FIG. 1A are reversed. In the secondary battery 1, the battery element 10 is packaged with a laminate film 6 that is an exterior material. FIG. 2 is a schematic diagram showing in detail the configuration of the top portion of the battery element 10 accommodated in the nonaqueous electrolyte battery 1. 3A and 3B are perspective views showing the structures of the positive electrode 11 and the negative electrode 12 constituting the battery element 10.

[Battery element]
As shown in FIG. 2, the battery element 10 has a stacked type in which a substantially rectangular positive electrode 11 and a substantially rectangular negative electrode 12 arranged to face the positive electrode 11 are alternately stacked via separators 13. For example, a gel electrolyte layer (not shown) may be formed on both surfaces of the positive electrode 11 and the negative electrode 12.

  Further, from the battery element 10, a positive electrode terminal 2 electrically connected to each of the plurality of positive electrodes 11 and a negative electrode terminal 3 electrically connected to each of the plurality of negative electrodes 12 are drawn out. The plurality of positive electrode terminals 2 and negative electrode terminals 3 are fixed to the positive electrode lead 4a and the negative electrode lead 4b by resistance welding, ultrasonic welding or the like, respectively. It is configured to be bent so as to be substantially U-shaped. The positive electrode terminal 2 and the negative electrode terminal 3 are bent into a U shape with appropriate slack at the bent portion.

  Hereinafter, a battery element 10 in which three positive electrodes 11 and four negative electrodes 12 are alternately stacked via separators 13 will be described.

  The positive electrode terminal 2 has a very small gap between the lead portion extending from the positive electrode 11 to the U-shaped bent portion and the tip portion extending from the U-shaped bent portion to the tip of the positive electrode terminal 2, for example, 1 mm or less. be able to. By using the configuration and the manufacturing method of the present invention, even when the gap between the lead portion and the tip portion is reduced as described above, a part of the positive electrode terminal 2 is in the thickness direction of the battery element 10. It is possible to prevent the positive electrode terminal 2 from being pulled and stretched and stretched, or wrinkled and twisted.

  Such a battery element 10 is packaged with a laminate film 6 as an exterior material, and the positive electrode lead 4 a and the negative electrode lead 4 b connected to the positive electrode terminal 2 and the negative electrode terminal 3, respectively, are sealed portions of the laminate film 6. To the outside of the battery. As shown in FIG. 1B, a recess 7 is formed in the first region 6A of the laminate film 6 by, for example, drawing in advance. The battery element 10 is accommodated in the recess 7. Then, the second region 6B of the laminate film 6 that is continuous with the first region is disposed so as to cover the opening of the recess 7, and the periphery of the opening of the recess 7 is bonded by thermal fusion or the like. Is done. The positive electrode lead 4 a and the negative electrode lead 4 b connected to the positive electrode terminal 2 and the negative electrode terminal 3, respectively, are led out from the sealing portion of the laminate film 6. The regions of the positive electrode lead 4a and the negative electrode lead 4b that are in contact with the laminate film 6 are covered with, for example, adhesion films 5a and 5b in order to improve the adhesion between the positive electrode lead 4a and the negative electrode lead 4b and the laminate film 6, respectively. .

[Positive electrode]
FIG. 3A shows the configuration of the positive electrode 11. The positive electrode 11 includes a substantially rectangular positive electrode current collector 11b and a positive electrode active material layer 11a formed on both surfaces of the positive electrode current collector 11b. The positive electrode current collector 11b is a metal foil made of, for example, aluminum (Al). From one side of the positive electrode 11, for example, a positive electrode terminal 2 formed integrally with the positive electrode current collector 11b is drawn out.

  Moreover, the positive electrode terminal 2 of another component may be connected to the positive electrode collector 11b. In such a case, the positive electrode terminal 2 is not limited to the metal foil as described above, and a conductive material or the like can also be used.

  Here, the positive electrode 11 shown in FIG. 3A is a schematic diagram for illustrating the configuration of the positive electrode current collector 11b and the positive electrode terminal 2 formed integrally with the positive electrode current collector 11b. A positive electrode active material layer 11a is formed over the entire surface of the positive electrode current collector 11b.

The positive electrode active material layer 11a includes, for example, a positive electrode active material, a conductive agent, and a binder. As the positive electrode active material, mainly Li _x MO ₂ (wherein M represents one or more transition metals, x is different depending on the charge / discharge state of the battery, and is usually 0.05 or more and 1.10 or less). A composite oxide of lithium and a transition metal is used. As a transition metal constituting the lithium composite oxide, cobalt (Co), nickel (Ni), manganese (Mn), or the like is used.

Specific examples of such a lithium composite oxide include lithium cobaltate (LiCoO ₂ ), lithium nickelate (LiNiO ₂ ), and lithium manganate (LiMn ₂ O ₄ ). A solid solution in which a part of the transition metal element is substituted with another element can also be used. Examples thereof include nickel cobalt composite lithium oxide (LiNi _0.5 Co _0.5 O ₂ , LiNi _0.8 Co _0.2 O _2, etc.). These lithium composite oxides can generate a high voltage and have an excellent energy density.

Further, as the positive electrode active material, LiM _y PO ₄ (wherein M represents one or more transition metals, y is different depending on the charge / discharge state of the battery, and is usually 0 or more and 1 or less), A lithium phosphate compound of lithium and a transition metal can also be used. As the transition metal constituting the lithium phosphate compound, iron (Fe), cobalt (Co), nickel (Ni), manganese (Mn), or the like is used.

As such a lithium phosphate compound, specifically, lithium iron phosphate (LiFePO ₄ ) or a part of iron of lithium iron phosphate is cobalt (Co), nickel (Ni) for structural stability or the like. Examples thereof include compounds substituted with other elements such as manganese (Mn).

  Such a lithium composite oxide and a lithium phosphate compound can generate a high voltage and become a positive electrode active material excellent in energy density.

Furthermore, TiS _2, MoS _2, may be used NbSe _2, V ₂ O no lithium metal sulfides such as ₅ or metal oxide as a cathode active material. As the positive electrode active material, a mixture of a plurality of these materials may be used.

  As the conductive agent, for example, a carbon material such as carbon black or graphite is used. As the binder, for example, polyvinylidene fluoride (PVdF), polytetrafluoroethylene (PTFE), or the like is used.

[Negative electrode]
FIG. 3B shows the configuration of the negative electrode 12. The negative electrode 12 includes, for example, a negative electrode current collector 12b whose outer dimension is several mm larger than the positive electrode current collector 11b, and a negative electrode active material layer 12a formed on both surfaces of the negative electrode current collector 12b. The negative electrode current collector 12b is a metal foil made of, for example, copper (Cu), nickel (Ni), stainless steel (SUS), or the like. From one side of the negative electrode 12, a negative electrode terminal 3 molded integrally with the negative electrode current collector 12b is drawn.

  Moreover, the negative electrode terminal 3 of another component may be connected to the negative electrode collector 12b. In such a case, the negative electrode terminal 3 is not limited to the metal foil as described above, and a conductive material or the like can also be used.

  The negative electrode current collector 12b needs to have good electrochemical stability, electrical conductivity, and mechanical strength. Since the negative electrode 12 is exposed to a highly reducing atmosphere, many metals including aluminum (Al) form an alloy with lithium (Li) and become powdery. For this reason, it is necessary to use a metal material that does not cause alloying. Examples of such a metal material include copper (Cu), nickel (Ni), and stainless steel (SUS). In particular, copper (Cu) is preferable because it has high electrical conductivity and high flexibility.

  The negative electrode active material layer 12a includes, for example, a negative electrode active material, a conductive agent, and a binder. As the negative electrode active material, lithium metal, a lithium alloy, a carbon material that can be doped / undoped with lithium, or a composite material of a metal material and a carbon material is used. Specific examples of carbon materials that can be doped / dedoped with lithium include non-graphitizable carbon, graphitizable carbon, graphite, pyrolytic carbons, cokes, glassy carbons, and organic polymer compound firing. Body, carbon fiber or activated carbon. Among these, examples of coke include pitch coke, needle coke, and petroleum coke. An organic polymer compound fired body refers to a carbonized material obtained by firing a polymer material such as phenol resin or furan resin at an appropriate temperature, and part of it is non-graphitizable carbon or graphitizable carbon. Some are classified as: In addition, examples of the polymer material include polyacetylene and polypyrrole.

  Among such negative electrode materials capable of inserting and extracting lithium (Li), those having a charge / discharge potential relatively close to lithium metal are preferable. This is because the lower the charge / discharge potential of the negative electrode 12, the easier the battery has a higher energy density. Among these, a carbon material is preferable because a change in crystal structure that occurs during charge / discharge is very small, a high charge / discharge capacity can be obtained, and good cycle characteristics can be obtained. In particular, graphite is preferable because it has a high electrochemical equivalent and can provide a high energy density. Moreover, non-graphitizable carbon is preferable because excellent cycle characteristics can be obtained.

  Examples of the negative electrode material capable of inserting and extracting lithium (Li) include lithium metal alone, a metal element or metalloid element simple substance, alloy or compound capable of forming an alloy with lithium (Li). These are preferable because a high energy density can be obtained, and in particular, when used together with a carbon material, a high energy density can be obtained and excellent cycle characteristics can be obtained, and therefore, it is more preferable. Note that in this specification, alloys include those composed of one or more metal elements and one or more metalloid elements in addition to those composed of two or more metal elements. The structures include solid solutions, eutectics (eutectic mixtures), intermetallic compounds, or those in which two or more of them coexist.

Examples of such metal elements or metalloid elements include tin (Sn), lead (Pb), aluminum (Al), indium (In), silicon (Si), zinc (Zn), antimony (Sb), and bismuth. (Bi), cadmium (Cd), magnesium (Mg), boron (B), gallium (Ga), germanium (Ge), arsenic (As), silver (Ag), zirconium (Zr), yttrium (Y) or hafnium (Hf). These alloys or compounds, for example, those represented by the chemical formula Ma _f Mb _g Li _h or formula Ma _s Mc _t Md _u,. In these chemical formulas, Ma represents at least one of a metal element and a metalloid element capable of forming an alloy with lithium, Mb represents at least one of a metal element and a metalloid element other than lithium and Ma, Mc represents at least one of nonmetallic elements, and Md represents at least one of metallic elements and metalloid elements other than Ma. The values of f, g, h, s, t, and u are f> 0, g ≧ 0, h ≧ 0, s> 0, t> 0, and u ≧ 0, respectively.

  Among these, a simple substance, alloy or compound of Group 4B metal element or semimetal element in the short-period type periodic table is preferable, and silicon (Si) or tin (Sn), or an alloy or compound thereof is particularly preferable. These may be crystalline or amorphous.

Examples of the anode material capable of inserting and extracting lithium further include other metal compounds such as oxide, sulfide, or lithium nitride such as LiN ₃ . Examples of the oxide include MnO ₂ , V ₂ O ₅ , V ₆ O _{13 and the} like. In addition, examples of oxides that have a relatively low potential and can occlude and release lithium include iron oxide, ruthenium oxide, molybdenum oxide, tungsten oxide, titanium oxide, and tin oxide. Examples of the sulfide include NiS and MoS.

  In particular, natural graphite and artificial graphite and other graphites are rich in chemical stability and can repeatedly and stably undergo lithium ion deinsertion reactions, and are easily available industrially. Widely used.

  As materials other than carbon, various kinds of metals and semi-metals can be used. For example, magnesium (Mg), boron (B), aluminum (Al), gallium capable of forming an alloy with lithium can be used. (Ga), indium (In), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), bismuth (Bi), cadmium (Cd), silver (Ag), zinc (Zn), hafnium (Hf), zirconium (Zr), yttrium (Y), palladium (Pd), platinum (Pt), and alloys thereof. These may be crystalline or amorphous.

Further, lithium doped as the dedoping can material, may be used polyacetylene, an oxide of _2, such as polymers and SnO polypyrrole.

  Examples of the binder include a fluorine polymer compound such as polyvinylidene fluoride (PVdF), or a synthetic rubber such as styrene butadiene rubber (SBR) or ethylene propylene diene rubber (EPDR). Moreover, the polymer which contains the repeating unit derived from vinylidene fluoride (VdF) as a component is preferable. This is because the stability in the secondary battery is high. Examples of such a polymer include vinylidene fluoride-hexafluoropropylene (HFP) copolymer, vinylidene fluoride-tetrafluoroethylene (TFE) copolymer, and the like. As the binder, one kind may be used alone, or two or more kinds may be mixed and used.

[Positive lead and negative lead]
The positive electrode lead 4a connected to the positive electrode terminal 2 and the negative electrode lead 4b connected to the negative electrode terminal 3 include, for example, a circuit having a positive electrode terminal 2 and a negative electrode terminal 3, a contact portion for connecting to an electronic device, a protection circuit, and the like. Relay with a substrate (not shown). The positive electrode lead 4a is made of the same material as the positive electrode terminal 2 such as aluminum (Al). The negative electrode lead 4b is made of the same material as the negative electrode terminal 3, such as copper (Cu), nickel (Ni), or stainless steel (SUS).

[Adhesion film]
The adhesion films 5a and 5b provided on the positive electrode lead 4a and the negative electrode lead 4b are made of a resin material excellent in adhesiveness with the metal material constituting the positive electrode lead 4a and the negative electrode lead 4b. Examples of such a resin material include modified polymers such as acid-modified polypropylene (PP).

[Separator]
The separator 13 is composed of, for example, a porous film made of a polyolefin resin material such as polypropylene (PP) or polyethylene (PE), or a porous film made of an inorganic material such as a ceramic nonwoven fabric. A structure in which the porous films are laminated may be used. Among these, porous films of polyethylene (PE) and polypropylene (PP) are most effective.

[Electrolytes]
As the electrolyte, an electrolyte salt and a non-aqueous solvent that are generally used in lithium ion secondary batteries can be used. Specific examples of the non-aqueous solvent include ethylene carbonate (EC), propylene carbonate (PC), γ-butyrolactone, dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), dipropyl carbonate ( DPC), ethylpropyl carbonate (EPC), or a solvent in which hydrogen of these carbonates is substituted with halogen. One of these solvents may be used alone, or a plurality of these solvents may be mixed with a predetermined composition.

As the electrolyte salt, one that dissolves in the non-aqueous solvent is used, and a combination of a cation and an anion is used. As the cation, an alkali metal or an alkaline earth metal is used. As the anion, Cl ⁻ , Br ⁻ , I ⁻ , SCN ⁻ , ClO ₄ ⁻ , BF ₄ ⁻ , PF ₆ ⁻ , CF ₃ SO ₃ ^{− and the} like are used. Specifically, lithium hexafluorophosphate (LiPF ₆ ), lithium tetrafluoroborate (LiBF ₄ ), bis (trifluoromethanesulfonyl) imide lithium (LiN (CF ₃ SO ₂ ) ₂ ), bis (pentafluoro Ethanesulfonyl) imidolithium (LiN (C ₂ F ₅ SO ₂ ) ₂ ) lithium perchlorate (LiClO ₄ ) and the like. The electrolyte salt concentration is not a problem as long as it can be dissolved in the above solvent, but the lithium ion concentration is in the range of 0.4 mol / kg or more and 2.0 mol / kg or less with respect to the nonaqueous solvent. preferable.

  In the case of using a polymer electrolyte, a polymer electrolyte is obtained by incorporating a gel polymer electrolyte solution obtained by mixing a nonaqueous solvent and an electrolyte salt into a matrix polymer. The matrix polymer has a property compatible with a non-aqueous solvent. As such a matrix polymer, silicon gel, acrylic gel, acrylonitrile gel, polyphosphazene modified polymer, polyethylene oxide, polypropylene oxide, and their composite polymers, cross-linked polymers, modified polymers, and the like are used. Further, as a fluorine-based polymer, polyvinylidene fluoride (PVdF), a copolymer containing vinylidene fluoride (VdF) and hexafluoropropylene (HFP) as repeating units, vinylidene fluoride (VdF) and trifluoroethylene (TFE). And a polymer such as a copolymer having a repeating unit. Such a polymer may be used individually by 1 type, and may mix and use 2 or more types.

[Laminate film]
As shown in FIG. 4, the laminate film 6 used as the exterior material is formed of a multilayer film having moisture resistance and insulating properties, in which an outer resin layer 6b and an inner resin layer 6c are formed on both surfaces of the metal foil 6a, respectively. . Nylon (Ny) or polyethylene terephthalate (PET) is used for the outer resin layer 6b because of its beautiful appearance, toughness, and flexibility. The metal foil 6a plays the most important role in preventing moisture, oxygen, and light from entering, and protecting the battery element that is the contents. Aluminum (Al) is light because of its lightness, extensibility, price, and ease of processing. Is most often used. The inner resin layer 6c is a part that melts and fuses with heat or ultrasonic waves, and a polyolefin resin material, for example, unstretched polypropylene (CPP) is often used.

  In general, the thickness of the separator is preferably 5 μm or more and 50 μm or less, more preferably 5 μm or more and 20 μm or less. If the separator is too thick, the amount of the active material filled decreases, the battery capacity decreases, and the ionic conductivity decreases and the current characteristics deteriorate. On the other hand, if it is too thin, the mechanical strength of the film will decrease, and both positive and negative electrodes will be shorted or broken by foreign matter.

(1-2) Method for Manufacturing Nonaqueous Electrolyte Battery The nonaqueous electrolyte battery 1 as described above can be manufactured by the following steps.

[Production of positive electrode]
First, for example, a positive electrode active material, low crystalline carbon, a conductive agent, and a binder are mixed to prepare a positive electrode mixture, and this positive electrode mixture is dispersed in a solvent such as N-methylpyrrolidone. A positive electrode mixture slurry is obtained. Subsequently, the positive electrode mixture slurry is applied to both surfaces of the positive electrode current collector 11b and the solvent is dried. Then, the positive electrode active material layer 11a is formed by compression molding using a roll press or the like, and the positive electrode 11 is manufactured. At this time, it is assumed that the positive electrode current collector 11b has the positive electrode terminal 2 formed integrally.

[Production of negative electrode]
Further, for example, a negative electrode active material and a binder are mixed to prepare a negative electrode mixture, and the negative electrode mixture is dispersed in a solvent such as N-methylpyrrolidone to obtain a negative electrode mixture slurry. Subsequently, the negative electrode mixture slurry is applied to the negative electrode current collector 12b and the solvent is dried. Then, the negative electrode active material layer 12a is formed by compression molding using a roll press or the like, and the negative electrode 12 is manufactured. At this time, it is assumed that the negative electrode current collector 12b is integrally formed with the negative electrode terminal 2 similarly to the positive electrode current collector 11b.

[Lamination process]
Next, the positive electrode 11 and the negative electrode 12 are alternately overlapped with each other through the separator 13 so that, for example, the negative electrode 12, the separator 13, the positive electrode 11, the separator 13, the negative electrode 12. A number of positive electrodes 11 and negative electrodes 12 are stacked. Then, it fixes in the state pressed so that the positive electrode 11, the negative electrode 12, and the separator 13 might contact | adhere, and the laminated electrode body 10a is produced. For fixing, a fixing member (not shown) such as an adhesive tape is used. The fixing members are provided, for example, on both side portions and the bottom portion of the laminated electrode body 10a. In the case of using a gel electrolyte, a gel electrolyte layer is formed on both surfaces of the positive electrode 11 and the negative electrode 12 and then laminated through the separator 13.

[First U-shaped bending process]
Subsequently, the plurality of positive electrode terminals 2 drawn from the laminated positive electrode 11 and the plurality of negative electrode terminals 3 drawn from the laminated negative electrode 12 are bent so as to have a substantially U-shaped cross section. The first U-shaped bending step is a step for giving the positive electrode terminal 2 and the negative electrode terminal 3 in advance an optimal U-shaped bending shape. By providing an optimal U-shaped bent shape in advance, the positive electrode terminal 2 and the negative electrode terminal are formed when the positive electrode terminal 2 and the negative electrode terminal 3 connected to the positive electrode lead 4a and the negative electrode lead 4b are bent later to form a U-shaped bent portion. 3 can be prevented from being subjected to stress such as tensile stress.

  FIG. 5 is a side view for explaining the U-bending process of the negative electrode terminal 3. In FIG. 5 and subsequent figures, the four negative terminals in the figure will be described as negative terminals 3a to 3d as appropriate. Moreover, below, each process is demonstrated about the negative electrode terminals 3a thru | or 3d.

  First, as shown in FIG. 5A, the laminated electrode body 10a is disposed on the work set base 20a having the U-shaped bending thin plate 21. The U-shaped bending thin plate 21 protrudes from the work set base 20a by an amount slightly smaller than the thickness of the laminated electrode body 10a, specifically, by an amount smaller by at least the total thickness of the plurality of negative electrode terminals 3a to 3d. Is installed. By setting it as such a structure, since the bending outer periphery side of the negative electrode terminal 3d is located in the range of the thickness of the laminated electrode body 10a, it is possible to prevent an increase in the thickness of the nonaqueous electrolyte battery 1 and appearance defects. it can.

  Subsequently, as shown in FIG. 5B, the laminated electrode body 10a is lowered or the work set base 20a is raised. At this time, since the space efficiency of the nonaqueous electrolyte battery 1 is improved as the gap between the laminated electrode body 10a and the U-shaped bending thin plate 21 is smaller, for example, the gap between the laminated electrode body 10a and the U-shaped bending thin plate 21 is gradually increased. To be smaller.

  As shown in FIG. 5C, after the laminated electrode body 10a is placed on the work set base 20a and a bent portion is formed in the negative electrode terminal 3, the roller 22 is lowered as shown in FIGS. 3 is bent into a U-shape.

  The U-shaped bending thin plate 21 preferably has a thickness of 1 mm or less, for example, about 0.5 mm. For the U-shaped bending thin plate 21, a material having a strength necessary for forming a bent shape in the plurality of positive electrode terminals 2 or negative electrode terminals 3 can be used even with such a thin plate. The strength required for the U-shaped bending thin plate 21 varies depending on the number of stacked positive electrodes 11 and negative electrodes 12, the hardness of materials used for the positive electrode terminals 2 and the negative electrode terminals 3, and the like. The thinner the U-bending thin plate 21 is, the smaller the curvature of the innermost bending negative electrode terminal 3a can be, and the smaller the space required for bending the negative electrode terminal 3, the better. As the U-shaped bending thin plate 21, for example, stainless steel (SUS), a reinforced plastic material, a plated steel material, or the like can be used.

[Electrode terminal cutting process]
Next, the tip of the negative electrode terminal 3 on which the U-shaped bent portion is formed is trimmed. In the electrode terminal cutting step, a U-shaped bent portion having an optimal shape is formed in advance, and excess portions of the positive electrode terminal 2 and the negative electrode terminal 3 are cut in accordance with the U-shaped bent shape. FIG. 6 is a side view for explaining the cutting process of the negative electrode terminal 3.

  As shown in FIG. 6A, the upper surface and the bottom surface of the laminated electrode body 10a in which the U-shaped bent portion is formed in the first U-shaped bending step are reversed, and the work set base 20b having the current collector slack escape portion 23 is provided. The laminated electrode body 10a is fixed to the substrate.

  Next, as shown in FIG. 6B, the tip portion from the U-shaped bent portion of the negative electrode terminals 3a to 3d formed with the U-shaped bent portion to the tip thereof is substantially L-shaped along the work set base 20b. Deform the tip. At this time, by maintaining the shape necessary for forming the U-shaped bent portion again, a larger sag is generated in the negative electrode terminal 3d on the outer peripheral side of the bending. When such slack enters the current collector slack escape portion 23 of the work set base 20b, the negative terminals 3a to 3d can be deformed without stress. In addition, you may make it deform | transform the negative electrode terminals 3a thru | or 3d in the state which fixed the front-end | tip part of the negative electrode terminals 3a thru | or 3d.

  Subsequently, as shown in FIG. 6C, after the negative electrode terminals 3a to 3d are pressed against the work set base 20b by the current collector presser 24, for example, along the current collector presser 24 as shown in FIGS. 6D and 6E. The tips of the negative terminals 3a to 3d are cut and aligned with the cutting blade 25 provided as described above. The locations where the negative terminals 3a to 3d are cut are such that the ends of the negative terminals 3a to 3d are positioned within the thickness range of the laminated electrode body 10a when U-bending is performed again later. At least the surplus is cut off.

[Connection process]
Subsequently, the negative terminals 3a to 3d are connected to the negative lead 4b. In the connecting step, the positive electrode terminal 2 and the negative electrode terminal 3, and the positive electrode lead 4a and the negative electrode lead 4b are fixed while maintaining the optimum U-shaped bent shape formed in the first U-shaped bending step. Thereby, the positive electrode terminal 2 and the positive electrode lead 4a, and the negative electrode terminal 3 and the negative electrode lead 4b are electrically connected. FIG. 7 is a side view for explaining a connection process between the negative terminals 3a to 3d and the negative lead 4b.

  As shown in FIG. 7A, the upper surface and the bottom surface of the laminated electrode body 10a obtained by cutting off the excess tip of the negative terminals 3a to 3d in the electrode terminal cutting step are reversed again. Next, as shown in FIG. 7B, the laminated electrode body 10 a is fixed on the work set base 20 c having the current collector formation maintaining plate 26. The tip of the current collector formation maintaining plate 26 is located on the inner periphery side of the negative electrode terminal 3a so as to maintain the bent shape of the negative electrode terminals 3a to 3d and to generate, for example, ultrasonic vibration generated from the fixing device. Prevent the influence of external factors.

  Subsequently, as shown in FIG. 7C, the negative electrode terminals 3a to 3d and the negative electrode lead 4b are fixed, for example, by ultrasonic welding. For the ultrasonic welding, for example, an anvil 27a provided at the lower part of the negative terminals 3a to 3d and a horn 27b provided at the upper part of the negative terminals 3a to 3d are used. Negative terminals 3a to 3d are set in advance on the anvil 27a, the horn 27b is lowered, and the negative terminals 3a to 3d and the negative electrode lead 4b are held between the anvil 27a and the horn 27b. The anvil 27a and the horn 27b apply ultrasonic vibration to the negative terminals 3a to 3d and the negative lead 4b. Thereby, the negative terminals 3a to 3d and the negative lead 4b are fixed to each other.

[Lead bending process]
Next, the negative electrode lead 4b fixed to the negative electrode terminals 3a to 3d is bent into a predetermined shape. FIG. 8 is a side view for explaining the lead bending process of the negative electrode lead 4b.

  As shown in FIG. 8A, a work set having a current collector slack escape portion 23 by reversing the top and bottom surfaces of the laminated electrode body 10a to which the negative electrode terminals 3a to 3d and the negative electrode lead 4b are fixed in the connecting step. The laminated electrode body 10a is fixed on the table 20d. The connecting portion between the negative terminals 3a to 3d and the negative lead 4b is placed on the lead folding table 28a.

  Subsequently, as shown in FIG. 8B, the connecting portion between the negative electrode terminals 3a to 3d and the negative electrode lead 4b is pressed by the block 28b, and the roller 29 is lowered as shown in FIG. The negative electrode lead 4b protruding from 28b is bent.

[Second U-bending step]
Subsequently, as shown in FIG. 8D, the connection portion between the negative electrode terminals 3 a to 3 d and the negative electrode lead 4 b is bent by 90 ° to produce the battery element 10. In the second U-shaped bending step, the positive electrode lead 4a and the negative electrode lead 4b are respectively formed on the positive electrode terminal 2 and the negative electrode terminal 3 along the U-shaped bending shape formed in advance in the first U-shaped bending step. To do.

  At this time, in the portion having the curvature of the U-time bent portion, it is preferable that the curvature on the outer side of the negative electrode terminal 3a and the curvature on the inner side of the negative electrode terminal 3b adjacent to the negative electrode terminal 3a are substantially equal. Moreover, it is preferable that the curvature of the negative electrode terminal 3b on the outer side of bending and the curvature of the inner side of the negative electrode terminal 3c adjacent to the negative electrode terminal 3b are substantially equal. Furthermore, it is preferable that the curvature of the negative electrode terminal 3c on the outside of the bend and the curvature of the negative electrode terminal 3d adjacent to the negative electrode terminal 3c be substantially the same. The bending innermost negative electrode terminal 3a preferably has a bent inner shape formed along the shape of the U-shaped bending thin plate.

  In other words, in the U-shaped bent portion, it is preferable that the curvatures of the opposing surfaces of two adjacent negative electrode terminals are substantially equal. Thereby, in the part from the U-shaped bending part of a negative electrode terminal to a front-end | tip, a useless gap | interval does not arise between negative electrode terminals, and it leads to the improvement of space efficiency.

  In the above-described process, only the positive terminals 2a to 2d are described, but the negative terminal 3 can be bent in a U-shape by using the same method.

[Exterior process]
The battery element 10 manufactured as described above is packaged with an exterior material such as a laminate film 6 as shown in FIG. 1B. At this time, the adhesive films 5a and 5b are provided in the respective regions of the positive electrode leads 4a and 4b with which the laminate film 6 comes into contact when the laminate film 6 is packaged.

  Thereafter, the battery element 10 is accommodated in the recess 7 of the laminate film 6 formed by deep drawing, the laminate film 6 is folded back so as to cover the opening of the recess 7, and the outer peripheral portion of the recess 7 is bonded by heat fusion or the like. And seal. Thereby, the nonaqueous electrolyte battery 1 is obtained. In the case of using the electrolytic solution, one side of the outer peripheral portion of the concave portion 7 is left to be welded by heat fusion or the like, and the electrolytic solution is injected from one side of the unwelded portion, and then this one side is thermally welded and sealed. Stop. The laminate film 6 may be of a folded shape as shown in FIG. 1, and is sandwiched from above and below the battery element 10 by two laminate films, and the periphery of the battery element 10 is heat-sealed and sealed. May be.

  In the nonaqueous electrolyte battery 1 thus manufactured, the U-shaped bent portions of the positive electrode terminal 2 and the negative electrode terminal 3 maintain the optimal bent shape of the U-shaped bent portion obtained by the first U-shaped bending step. is doing. For this reason, it is possible to improve the space efficiency without causing excessive stress, wrinkles, or kinks in the U-shaped bent portions of the positive electrode terminal 2 and the negative electrode terminal 3.

  The fixed portion of the negative electrode lead 4b is not limited to the above example. For example, as shown in FIG. 9, the positive electrode lead 4 a and the negative electrode lead 4 b may be fixed from the bent outer peripheral side positive electrode terminal 2 and negative electrode terminal 3 side instead of the bent inner peripheral side positive electrode terminal 2 and negative electrode terminal 3. . In this case, as shown in FIGS. 10A to 10C, the negative electrode lead 4b is disposed so as to face the negative electrode terminal 3d and the negative electrode terminals 3a to 3d and the negative electrode lead 4b are fixed, and then the method shown in FIG. The negative electrode lead 4b is bent using, for example. Then, the U-shaped bent portion can be formed by deforming the fixing portion of the negative electrode terminals 3a to 3d and the negative electrode lead 4b by 90 °.

  Further, the positive electrode lead 4a and the negative electrode lead 4b may be fixed as shown in FIG. In this case, as shown in FIGS. 12A and 12B, for example, the negative electrode lead 4b bent in advance in a substantially L shape is disposed so as to face the negative electrode terminal 3d, and the negative electrode terminals 3a to 3d and the negative electrode lead 4b are fixed. After that, the U-shaped bent portion can be formed by deforming the fixing portion between the negative electrode terminals 3a to 3d and the negative electrode lead 4b by 90 °.

  9 and FIG. 11, the positive electrode lead 4a can form a U-shaped bent portion by the same method as the negative electrode lead 4b.

  The connection between the positive electrode terminal 2 and the positive electrode lead 4a and the connection between the negative electrode terminal 3 and the negative electrode lead 4b are not limited to the above-described adhesion by ultrasonic welding or resistance welding. For example, as shown in FIGS. 13A to 13B, the positive electrode terminal 2 and the positive electrode lead 4a or the negative electrode terminal 3 and the negative electrode lead 4b can be electrically connected using the clamping members 30a and 30b made of a metal plate or the like. it can. When the clamping member 30b is used, for example, as shown in FIG. 13B, the negative terminals 3a to 3d and the negative lead 4b are sandwiched between the clamping members 30b and clamped to fix the negative terminals 3a to 3d and the negative lead 4b. Can be electrically connected. The positive electrode terminal 2 and the positive electrode lead 4a can be connected using the clamping member 30a in the same manner.

  14A to 14B, the positive electrode terminal 2 and the positive electrode lead 4a or the negative electrode terminal 3 and the negative electrode lead 4b may be fixed by caulking. In this case, for example, a caulking needle (not shown) can be pierced from the positive electrode lead 4a and negative electrode lead 4b side, and burrs formed on the surfaces of the positive electrode terminal 2 and the negative electrode terminal 3 can be pressed and connected.

  Although one embodiment of the present invention has been specifically described above, the present invention is not limited to the above-described embodiment, and various modifications based on the technical idea of the present invention are possible.

  For example, the battery manufacturing method described in the above embodiment is an example for producing the nonaqueous electrolyte battery of the present invention. After the electrode terminal has slack necessary for U-bending in advance, the electrode terminal Other methods may be used as long as it is possible to form a U-shaped bent portion by bending.

It is a basic diagram which shows the example of 1 structure of the nonaqueous electrolyte battery concerning this invention. It is an approximate line figure showing an example of 1 composition of an electrode terminal pulled out from a battery element used for a nonaqueous electrolyte battery concerning this invention. It is a basic diagram which shows one structural example of the positive electrode and negative electrode which are used for the nonaqueous electrolyte battery concerning this invention. It is sectional drawing which shows one structural example of the film-form exterior material used for the nonaqueous electrolyte battery concerning this invention. It is a basic diagram which shows the bending part formation method of an electrode terminal. It is a basic diagram which shows the bending part formation method of an electrode terminal. It is a basic diagram which shows the bending part formation method of an electrode terminal. It is a basic diagram which shows the bending part formation method of an electrode terminal. It is a basic diagram which shows the other structural example of the electrode terminal pulled out from the battery element used for the nonaqueous electrolyte battery concerning this invention. It is a basic diagram which shows the bending part formation method of another electrode terminal. It is a basic diagram which shows the other structural example of the electrode terminal pulled out from the battery element used for the nonaqueous electrolyte battery concerning this invention. It is a basic diagram which shows the bending part formation method of another electrode terminal. It is a basic diagram which shows the other connection method of an electrode terminal and an electrode lead. It is a basic diagram which shows the other connection method of an electrode terminal and an electrode lead. It is a basic diagram which shows the example of a conventional structure of the electrode terminal pulled out from a battery element. It is a basic diagram which shows the example of a conventional structure of the electrode terminal pulled out from a battery element. It is a basic diagram which shows the example of a conventional structure of the electrode terminal pulled out from a battery element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Nonaqueous electrolyte battery 2 ... Positive electrode terminal 3, 3a, 3b, 3c, 3d ... Negative electrode terminal 4a ... Positive electrode lead 4b ... Negative electrode lead 5a, 5b ... Adhesion film 6. ··· Laminated film 7 ··· Recessed portion 10 ··· Battery element 10a ··· Laminated electrode body 11 ··· Positive electrode 11a · · · Positive electrode active material layer 11b · · · Positive electrode current collector 12 · · · Negative electrode 12a ··· Negative electrode active material layer 12b ··· Negative electrode current collector 13 ··· Separator 20a, 20b, 20c, 20d ··· Work set table 21 ··· U-bending thin plate 22 · 29 · · · Roller 23 · · · ·················································································································· Folding table 28b ... Block 30 a, 30b ... clamping member

Claims (13)

A battery element in which a positive electrode in which a positive electrode active material layer is formed on both sides of a positive electrode current collector and a negative electrode active material layer in which a negative electrode active material layer is formed on both sides of a negative electrode current collector are alternately stacked via separators In a non-aqueous electrolyte battery covered with an exterior material,
Each of the positive current collectors is electrically connected to each other, and when the tip portions are aligned in a direction substantially parallel to the surface of the positive electrode, the bent portions are formed with a large slack in the bent outer peripheral side. A plurality of fixed positive terminals,
Each of the plurality of negative electrode current collectors is electrically connected, and the tip portions are aligned in a direction substantially parallel to the surface of the negative electrode. A plurality of fixed negative electrode terminals,
The non-aqueous electrolyte battery, wherein the positive electrode terminal and the negative electrode terminal are respectively bent so as to have a substantially U-shaped cross section to form a U-shaped bent portion. In the U-shaped bend,
2. The nonaqueous electrolyte battery according to claim 1, wherein curvatures of opposing surfaces of the two adjacent positive electrode terminals and the two adjacent negative electrode terminals are substantially equal. The nonaqueous electrolyte battery according to claim 1, wherein the positive electrode terminal and the positive electrode current collector are integrally formed. The nonaqueous electrolyte battery according to claim 1, wherein the negative electrode terminal and the negative electrode current collector are integrally formed. The nonaqueous electrolyte battery according to claim 1, wherein the positive electrode terminal and the negative electrode terminal are electrically connected to a first lead member and a second lead member, respectively. 6. The nonaqueous electrolyte battery according to claim 5, wherein the positive electrode terminal, the negative electrode terminal, the first lead member, and the second lead member are fixed to each other by resistance welding or ultrasonic welding. . 6. The nonaqueous electrolyte battery according to claim 5, wherein the positive terminal, the negative terminal, the first lead member, and the second lead member are clamped and fixed, respectively. 6. The nonaqueous electrolyte battery according to claim 5, wherein the positive electrode terminal, the negative electrode terminal, the first lead member, and the second lead member are respectively connected by caulking. The nonaqueous electrolyte battery according to claim 1, wherein the exterior material is a film-shaped exterior material. A positive electrode having a positive electrode active material layer formed on both sides of a positive electrode current collector formed integrally with a positive electrode terminal, and a negative electrode having a negative electrode active material layer formed on both sides of a negative electrode current collector formed integrally with a negative electrode terminal, Laminating step of alternately laminating through,
A first U-bending step of bending each of the plurality of positive terminals and the negative terminals into a substantially U-shaped cross section;
The positive terminal is deformed into a substantially L shape so that the tip of the positive terminal bent into a substantially U shape is substantially parallel to the positive electrode, and becomes larger toward the outer periphery side of the bent portion of the positive terminal. A positive terminal cutting step of providing a first sagging and trimming the tips of the positive terminals while holding the first sagging;
The negative electrode terminal is deformed into a substantially L shape so that the tip portion of the negative electrode terminal bent into a substantially U shape is substantially parallel to the negative electrode, and becomes larger as it goes to the bending outer periphery side at the bent portion of the negative electrode terminal. A negative terminal cutting step of providing a second sagging, and trimming the tips of the negative terminals while holding the second sagging,
A connecting step of electrically connecting the tip portion of the positive electrode terminal and the tip portion of the negative electrode terminal, and the first lead member and the second lead member, respectively;
A lead member bending step of bending the first lead member and the second lead member in respective desired directions;
A method for producing a nonaqueous electrolyte battery, comprising: a second U-bending step in which the positive electrode terminal and the negative electrode terminal are deformed to form a U-shaped bent portion again. In the first U-bending step,
Moving the plate member perpendicular to the positive electrode terminal or the negative electrode terminal, moving the plate member to a predetermined position to form a bent portion in the positive electrode terminal or the negative electrode terminal;
A roller is moved along a bending outer peripheral side of the positive electrode terminal or the negative electrode terminal in a direction opposite to the moving direction of the plate-like member to bend the positive electrode terminal or the negative electrode terminal into a substantially U-shaped cross section. The manufacturing method of the nonaqueous electrolyte battery of Claim 10. In the connection process,
The non-aqueous solution according to claim 10, wherein the tip portion of the positive electrode terminal and the tip portion of the negative electrode terminal are fixed to the first lead member and the second lead member by resistance welding or ultrasonic welding. Manufacturing method of electrolyte battery. In the connection process,
The method for manufacturing a nonaqueous electrolyte battery according to claim 10, wherein the connection is performed while maintaining the first sag and the second sag respectively.

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