WO2011036737A1 - 電池の製造方法 - Google Patents
電池の製造方法 Download PDFInfo
- Publication number
- WO2011036737A1 WO2011036737A1 PCT/JP2009/004937 JP2009004937W WO2011036737A1 WO 2011036737 A1 WO2011036737 A1 WO 2011036737A1 JP 2009004937 W JP2009004937 W JP 2009004937W WO 2011036737 A1 WO2011036737 A1 WO 2011036737A1
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- WIPO (PCT)
- Prior art keywords
- mixture
- foil
- electrode body
- winding
- battery
- Prior art date
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Classifications
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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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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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
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound 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
- H01M10/04—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
- H01M10/052—Li-accumulators
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/34—Gastight accumulators
- H01M10/345—Gastight metal hydride accumulators
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
Definitions
- the present invention relates to a battery manufacturing method, and more particularly to a technique for manufacturing a battery including an electrode body formed as a wound body.
- a battery such as a lithium secondary battery configured in a cylindrical shape
- a battery such as a lithium secondary battery configured in a cylindrical shape
- the electrode body functions as a charging / discharging element of the battery by impregnating the electrolytic solution while being accommodated in the exterior.
- Electrode terminals are provided on the outer periphery of the exterior. The electrode terminal is connected to the electrode body via a current collector plate, a lead terminal, and the like, and is a path for electrically connecting the inside of the battery (electrode body) and the outside.
- An electrode mixture is coated on each of the positive electrode foil and the negative electrode foil constituting the electrode body, and the positive electrode foil and the negative electrode foil are so arranged that the coated portions of the foils overlap with each other through a separator. As it is turned, it is wound so that the uncoated parts of each foil protrude in opposite directions. That is, the uncoated portions of the positive foil and the negative foil are disposed so as to protrude from the winding surface toward both sides, and a plurality of uncoated portions having different wraparounds are disposed in the radial direction of the electrode body. Yes.
- the uncoated part in a state protruding from the winding surface as described above functions as a current collecting part of the electrode body, and is joined to the current collecting plate at such a part.
- Patent Document 1 a current collector plate having a plurality of recesses capable of accommodating a bundle of current collectors is used to accommodate an electrode body in an exterior, and the current collector plate is brought into contact from above the electrode body. The structure which weld-joins a current collecting plate and an electrode body in the state is disclosed.
- An object of the present invention is to provide a battery manufacturing method capable of collecting foil by applying a current collector portion with high quality and easily.
- the battery manufacturing method includes a separator comprising a positive electrode foil having a positive electrode mixture coated on a part of a surface and a negative electrode foil having a negative electrode mixture coated on a part of a surface.
- a battery comprising an electrode body formed by winding in a state where the electrode body is stacked, and when winding the electrode body, at least one of the positive electrode foil and the negative electrode foil A plurality of sheets having different circulations are collected in the radial direction of the electrode body of the mixture uncoated portion by applying the mixture to the uncoated portion of the mixture.
- the uncoated portion is pressed while moving the back-and-forth movement using the kashing roll configured to be movable back and forth with respect to the winding shaft of the electrode body. By doing so, it is preferable to apply crease so that the foil collection of the mixture uncoated part is performed periodically.
- the crease roll moves forward and backward according to the change in the radial thickness accompanying the winding of the electrode body and the crease cycle.
- the crease roll is disposed at a position close to the winding axis and can directly press the electrode body during winding.
- the crease roll has a conical shape with the tip side of the mixture uncoated portion as a bottom surface.
- the battery manufacturing method of the present invention it is possible to easily and high-quality the current collecting part by applying the squeezed foil.
- FIG. 1 It is a schematic diagram which shows the battery manufactured by the manufacturing method of the battery of this invention. It is a figure which shows the electrode body contained in a battery, (a) shows the perspective view of an electrode body, (b) shows sectional drawing of an electrode body. It is a perspective view which shows the current collecting plate connected to an electrode body. It is a figure which shows the structure of a current collecting plate, (a) shows a top view, (b) shows the AA line end surface enlarged view. It is a figure which shows the joining form of the current collection part of an electrode body, and a current collection plate. It is a figure which shows the winding process of the electrode element which comprises an electrode body. It is a figure which shows the press by a caulking roll.
- the battery 10 is configured as a secondary battery such as a lithium ion battery or a nickel metal hydride battery.
- the battery 10 is a cylindrical battery, and includes a cylindrical exterior 20 and an electrode body 30 accommodated in the exterior 20.
- the electrode body 30 is electrically connected to a positive terminal 41 and a negative terminal 42 which are electrical connection paths with the outside.
- the exterior 20 is a cylindrical container made of metal such as aluminum, and accommodates the electrode body 30 therein.
- a positive electrode terminal 41 protrudes outward from one end of the exterior 20 and a negative electrode terminal 42 is provided at the other end.
- the electrode body 30 is a cylindrical ridge formed by laminating a positive foil 31 and a negative foil 32 with a separator 33 interposed therebetween and winding a plurality of times around the core 34 as a central axis. It is a round body.
- the positive electrode foil 31 is a current collector foil made of metal such as aluminum, and a positive electrode mixture which is an electrode material containing an active material is coated on a part of the surface.
- the negative electrode foil 32 is a current collector foil made of metal such as copper, and a negative electrode mixture which is an electrode material containing an active material is coated on a part of the surface.
- the separator 33 is a porous thin film made of polyethylene, polypropylene, polyolefin, or the like, and is interposed between the positive electrode foil 31 and the negative electrode foil 32 to prevent direct contact thereof.
- the core 34 is a resin member having insulation properties such as polypropylene.
- the winding core 34 has a rod shape and is used as a winding shaft when the electrode body 30 is wound.
- the positive electrode foil 31 and the negative electrode foil 32 are wound so that the portions coated with the mixture are overlapped via the separator 33, and the mixture is applied. It is wound so that the mixture uncoated portions 35 and 36 which are not parts protrude in opposite directions.
- a plurality of mixture-uncoated portions 35 having different radii in the radial direction are arranged at one end in the axial direction of the electrode body 30 (upper end in FIG. 2B), and the other end in the axial direction (FIG. 2B).
- a plurality of mixture uncoated portions 36 having different laps in the radial direction are arranged on the lower end portion of the plate.
- the unmixed portions 35 and 36 are portions that function as current collectors of the current collector foils 31 and 32, and are joined to the current collector plates 37 and 38 (see FIG. 3).
- the current collecting plates 37 and 38 are connected to the terminals 41 and 42 via lead terminals (not shown). In this manner, the electrode body 30 and the terminals 41 and 42 are electrically connected, and the terminals 41 and 42 function as an electrical connection path with the outside of the battery 10.
- the configuration of the current collector plates 37 and 38 and the form of joining between the current collector plates 37 and 38 and the unmixed portions 35 and 36 will be described. Since the current collector plates 37 and 38 have the same configuration, the current collector plate 37 joined to the positive electrode mixture uncoated portion 35 will be described in detail, and the negative electrode mixture uncoated portion 36 will be described. Detailed description of the current collector plate 38 to be joined to and the detailed description of the joining form of the current collector plate 38 and the unmixed portion 36 are omitted.
- the current collector plate 37 is a metal member extending in a straight line, and includes a through-hole 37a and a plurality of (in the drawing, three in one direction from the central portion, Three) holes 37b, 37b... Are provided on the opposite direction side.
- the through hole 37 a is a hole having a diameter through which the winding core 34 can penetrate, and is disposed at the center of the current collector plate 37. That is, the holes 37b are arranged symmetrically around the through hole 37a.
- the hole portion 37b includes a slit portion 37c that opens linearly, and clamping portions 37d and 37d that form the slit portion 37c.
- the slit portion 37c is an opening formed at a predetermined interval, and is formed in a straight line in a direction orthogonal to the extending direction of the current collector plate 37 (see FIG. 4A).
- the sandwiching portions 37d and 37d have a shape that extends toward one side in the thickness direction (lower side in the drawing) of the current collector plate 37 and bends toward the opposite side (upper side in the drawing) at the end portion. Have. That is, each clamping part 37d is formed by bending at two locations, the base end part and the middle part.
- a plurality of bundles 35a formed in this manner are formed by collecting a plurality of sheets having different laps in the radial direction of the mixture uncoated portion 35 as one bundle 35a. It inserts in each slit part 37c.
- the sandwiching portions 37d and 37d apply a sandwiching force to the bundle 35a of the mixture uncoated portion 35 inserted into the slit portion 37c, and closely contact the collected mixture uncoated portion 35.
- the mixture uncoated portion 35 inserted into the slit portion 37c, that is, with the mixture uncoated portion 35 inserted into the holes 37b, 37b,.
- the part 35 is joined to the current collector plate 37.
- the joining is appropriately performed by, for example, laser welding or brazing.
- the mixture uncoated portion 35 collected in the plurality of bundles 35a, 35a,... Is further adhered by being inserted into the slit portion 37c, and there is no gap between the laps. Are joined to the holes 37b, 37b.
- the number of holes 37b, 37b,... Of the current collector plate 37 that becomes the joint between the current collector plate 37 and the unmixed portion 35 is not limited to six in the present embodiment. It can be set in consideration of the man-hour at the time of joining, the joining form with the electrode body 30, and the like. For example, when the number of the holes 37b is small, the number of bonding steps can be reduced to improve the working efficiency, and when the number of the holes 37b is large, the bonding quality between the electrode body 30 and the current collector plate 37 can be improved.
- the width of the slit portion 37c of the hole portion 37b provided in the current collector plate 37 is set in consideration of the thickness of the unmixed portion 35 and the like.
- the mixture uncoated portion 35 which is a current collecting portion of the electrode body 30 is joined to the current collecting plate 37 in a state where the mixture is collected in a plurality of bundles 35a, 35a. That is, a process of collecting the mixture uncoated portion 35 into the plurality of bundles 35a, 35a,.
- a process of collecting foil after winding an electrode body has been performed.
- the foil collection after winding may cause problems such as damage or breakage of the current collection foil, and high-precision foil collection work is necessary.
- this embodiment provides a battery manufacturing method including a winding step of winding the electrode body 30 and simultaneously collecting the foil.
- a manufacturing process for manufacturing the battery 10 will be described with reference to FIGS.
- the electrode body 30 is formed by winding the positive electrode foil 31, the negative electrode foil 32, and the separator 33, which are electrode elements constituting the electrode body 30, around the core 34.
- the electrode body 30 formed in the winding process and the winding process is housed in the exterior 20 and includes appropriate lower processes such as an assembling process for assembling the battery 10.
- the positive electrode foil 31, the separator 33, the negative electrode foil 32, and the separator 33 are arranged in this order from the winding core 34 side (winding center side).
- the ends of the foil 32 and the separators 33 and 33 are fixed to the outer peripheral surface of the core 34.
- the electrode body 30 wound around the winding core 34 as a central axis is formed with the fixed portion as a starting point of lamination of each electrode element.
- the mixture uncoated portions 35 and 36 of the positive electrode foil 31 and the negative electrode foil 32 are wound while maintaining a state of protruding in opposite directions. The position is adjusted.
- the mixture uncoated portions 35 and 36 are wound so as to protrude to the opposite side of the core 34 in the axial direction.
- the electrode elements 31, 32, and 33 are wound around the core 34 using the kneading rolls 50 and 50, and at the same time, the mixture is not applied.
- the working parts 35 and 36 are crushed and the mixture uncoated parts 35 and 36 are collected into a plurality of bundles 35a, 35a,..., Bundles 36a, 36a, respectively.
- the caulking roll 50 is in a position close to the core 34 and is the starting point of lamination of the electrode elements 31, 32, 33 (where the electrode elements 31, 32, 33 are fixed on the outer periphery of the core 34). It is arranged on the diagonal side.
- the caulking roll 50 can move back and forth with respect to the core 34 and moves linearly in the radial direction of the core 34.
- the movement of the caulking roll 50 is controlled by a moving device that linearly moves back and forth, a control device that controls the operation of the moving device and controls the form of the caulking.
- the wrinkle roll 50 changes its position relative to the center of the core 34 so as to come into contact with the intermediate portion of the mixture uncoated portions 35 and 36 in the winding axis direction, and to the core 34 side (the shaft Press in the direction of the heart). Thereby, the mixture uncoated portions 35 and 36 are deformed so as to be inclined in the axial direction. In this way, the mixture uncoated portions 35 and 36 are pressed toward the core 34 by the caulking roll 50 to pressurize the mixture uncoated portions 35 and 36 in the axial direction, and have a predetermined inclined shape. This deformation is referred to as “intimidation on the unmixed portions 35 and 36”. As shown in FIG.
- the uncoated material portions 35 and 36 are subjected to squeezing by a squeezing roll 50 and collected into a plurality of bundles 35 a, 35 a, 36 a, 36 a.
- the mixture uncoated parts 35 and 36 are grouped into a group for each of a plurality of laps (in the figure, a group of five laps) counted from the inner side of the winding, and are spaced apart from each other. Is collected in multiple groups.
- the foil collection of the mixture uncoated portions 35 and 36 is periodically performed.
- a plurality of foil collecting portions (bundles 35a, 35a,..., And bundles 36a, 36a,...) Having a fixed period are formed in the mixture uncoated portions 35, 36. Is done.
- the joining form such as the number and shape of the holes provided in the current collecting plates 37 and 38.
- the kneading roll 50 is moved relative to the core 34 as described above, and desired kneading is performed on the mixture uncoated portions 35 and 36 as described above. So that it is controlled. At this time, as the electrode elements 31, 32, and 33 are wound, the diameter of the electrode body 30 that is a wound body increases (curve indicated by a broken line in FIG. 9). On the other hand, the kneading roll 50 needs to be brought into contact with and pressed against the mixture uncoated portions 35 and 36 so that the mixture uncoated portions 35 and 36 satisfy a desired foil collecting form (see FIG. 9 is a curve indicated by a chain line).
- the movement control of the bracing roll 50 is set in consideration of the winding thickness of the electrode body 30 (curve shown by a solid line in FIG. 9). That is, the position of the caulking roll 50 is set such that the distance (a) is taken up when the outer peripheral surface of the core 34 facing the caulking roll 50 is set to the zero point and the distance (a) from the zero point is controlled. Is controlled so as to satisfy a function of synthesizing the time change of the thickness (time change of the distance between the outer circumferential surface of the wound body and the core 34) and the time change related to the crease cycle.
- the positive electrode foil 31, the negative electrode foil 32, and the separators 33 and 33 are wound in a laminated state, and at the same time, the mixture uncoated portions 35 and 36 are collected. Yes.
- a step of collecting the foil after winding becomes unnecessary, and a foil collecting that is not affected by the manufacturing error of the current collecting foil, the winding error or the like becomes possible. Therefore, it is possible to easily collect the foils by applying the high quality to the unmixed parts 35 and 36 which are current collectors.
- the caulking roll 50 is controlled so that the distance (a) to and from the winding core 34 approaches / separates in accordance with the change in the winding thickness of the electrode body 30 around the winding core 34.
- size of the habit of mixture uncoated parts 35 and 36 can be controlled with high precision, and a desired hauling form can be obtained easily. Therefore, the bonding quality between the unmixed portions 35 and 36 and the current collecting plates 37 and 38 can be improved, and the product quality of the battery 10 can be secured.
- the caulking roll 50 has the outer peripheral surface of the winding core 34 as a zero point, and moves forward and backward from the zero point in the radial direction. That is, the brazing roll 50 is disposed at a position close to the winding core 34, and can be deformed by directly pressing the mixture uncoated portions 35 and 36 during winding. According to this, since the state which presses in the same location over several turns is continued with respect to the site
- the caulking roll 50 is not applied to the uncoated portions 35 and 36 of the electrode elements 31 and 32 before reaching the core 34, not at a position close to the core 34. Can be brought into contact with each other, and in such a case, there is an advantage that the axial center side and the opposite side can be attached in both directions.
- the kneading roll 50 has a conical shape with the tip portions of the mixture uncoated portions 35 and 36 as bottom surfaces. That is, the caulking roll 50 is formed in a conical shape (or a truncated cone shape) having a large diameter from the base end portion to the distal end portion of the mixture uncoated portions 35 and 36, and the mixture uncoated portion
- the axial pressing force applied to the distal ends of the portions 35 and 36 is configured to be larger than the pressing force applied to the proximal end portion. According to this, the mixture uncoated portions 35 and 36 can be deformed into a natural inclined shape, and the external force applied to the mixture coated portions of the positive electrode foil 31 and the negative electrode foil 32 can be minimized. . Therefore, the current collecting part of the electrode body 30 can be collected with high accuracy.
- a spherical shape in consideration of easiness of manufacture, etc., a spherical shape (see FIG. 11 (a)) and a cylindrical shape (see FIG. 11 (b)). It is also possible to apply any configuration that can apply a radial pressing force to the mixture uncoated portions 35 and 36 during winding.
- the positive electrode foil 31, the negative electrode foil 32, and the separators 33 and 33 formed as long objects are stacked and wound around the core 34.
- the positive electrode foil 31, the negative electrode foil 32, and the separators 33 and 33 are laminated
- the process of forming a laminated body, and the process of winding the said laminated body on the core 34 integrally are included. There may be a plurality of steps, and in such a case, the accuracy in stacking can be improved.
- the caulking roll 50 may be disposed on the upstream side of the core 34. In such a case, the caulking roll 50 can be caulked in both the axial direction of the core 34 and the opposite direction. It can be easily realized.
- the present invention can be applied to a method of manufacturing a cylindrical battery, and is particularly suitable for a technique for attaching a current collecting portion of an electrode body with high accuracy and collecting foil.
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Abstract
Description
外装の外周には、電極端子が設けられる。電極端子は、集電板、リード端子等を介して電極体と接続されており、電池内部(電極体)と外部とを電気的に接続する経路である。
上記のように捲回面から突出した状態の未塗工部は、電極体の集電部として機能し、係る部位において集電板と接合される。
例えば、特許文献1には、集電部の束を収容可能な凹部を複数有する集電板を用いて、電極体を外装内に収容し、前記集電板を電極体の上方から接触させた状態で、集電板と電極体とを溶接接合する構成が開示されている。このように、集電板を正極箔又は負極箔の未塗工部の束に接触させることで、重力を利用して当該未塗工部を集電板の凹部内に集箔することが可能となる。そして、複数の未塗工部を束ねた状態で接合することにより、接合面積を大きくすることができ、強度を担保できる。
図1に示すように、電池10は、円筒型の電池であり、円筒状の外装20、外装20内に収容される電極体30を具備する。電極体30は、外部との電気的な接続経路である正極端子41及び負極端子42と電気的に接続される。
正極箔31は、アルミニウム等の金属製の集電箔であり、表面の一部に活物質を含む電極材料である正極合剤が塗工されている。負極箔32は、銅等の金属製の集電箔であり、表面の一部に活物質を含む電極材料である負極合剤が塗工されている。セパレータ33は、ポリエチレン、ポリプロピレン、ポリオレフィン等からなる多孔性薄膜であり、正極箔31と負極箔32との間に介装され、これらの直接的な接触を防止する。
また、巻芯34は、ポリプロピレン等の絶縁性を有する樹脂製の部材である。巻芯34は、棒形状を有し、電極体30を捲回する際に捲回軸として用いられる。
合剤未塗工部35・36は、各集電箔31・32の集電部として機能する部位であり、集電板37・38と接合される(図3参照)。集電板37・38は、図示せぬリード端子等を介して、各端子41・42と接続されている。このようにして、電極体30と各端子41・42とが電気的に接続され、各端子41・42が電池10の外部との電気的な接続経路として機能する。
貫通孔37aは、巻芯34が貫通可能な径を有する孔であり、集電板37の中央部に配置される。つまり、孔部37b・・・は、貫通孔37aを中心として対称に配置されている。
スリット部37cは、所定の間隔に形成される開口であり、集電板37の延在方向と直交する方向に直線状に形成される(図4(a)参照)。
挟持部37d・37dは、集電板37の厚み方向一側(図示において下側)に向けて延出され、端部において延出方向と反対側(図示において上側)に向けて曲げられる形状を有する。つまり、各挟持部37dは、基端部及び中途部の二箇所にて曲げ加工を施すことによって形成される。
これにより、挟持部37d・37d間に挿入される部材の厚みがスリット部37cの幅よりも大きい場合に挟持部37d・37dに外力が加わって弾性変形が生じ、係る弾性変形に伴ってスリット部37cに挿入される部材に挟持力が付与される。
以上のように、複数の束35a・35a・・・に集箔された合剤未塗工部35は、スリット部37c内に挿入されることでさらに密着し、各周回間の隙間がない状態で孔部37b・37b・・・に接合される。
例えば、孔部37bの個数が少ない場合は、接合工数を削減して作業効率を向上でき、孔部37bの個数が多い場合は、電極体30と集電板37との接合品質を向上できる。
また、集電板37に設けられる孔部37bのスリット部37cの幅は、合剤未塗工部35の厚み等を考慮して設定される。
従来の電池の製造方法では、電極体を捲回した後に集箔する工程が行われていた。しかしながら、捲回後の集箔では、集電箔を傷付ける、又は破損する等の不具合が生じる虞があり、高精度での集箔作業が必要であった。
以下では、図6~図9を参照して、電池10を製造する製造工程について説明する。
電池10の製造工程は、電極体30を構成する電極要素である正極箔31、負極箔32、及び、セパレータ33を積層しつつ、巻芯34を中心として捲回して電極体30を形成する捲回工程、及び、捲回工程にて形成された電極体30を外装20内に収容し、電池10を組み立てる組立工程等の適宜の下工程を含む。
このとき、正極箔31及び負極箔32の合剤未塗工部35・36が互いに反対方向に突出した状態を保ちつつ捲回されるように、各電極要素31・32・33の軸方向における位置が調整される。なお、合剤未塗工部35・36が巻芯34の軸方向反対側に突出するように捲回される。
くせ付けロール50は、巻芯34に近接した位置であって、各電極要素31・32・33の積層始点(巻芯34の外周において、各電極要素31・32・33が固定される箇所)の対角側に配置されている。くせ付けロール50は、巻芯34に対して進退移動可能であり、巻芯34の径方向に向けて直線的に移動する。
このくせ付けロール50の移動は、直線的に進退移動する移動装置、当該移動装置の動作を制御し、くせ付けの形態を制御する制御装置等によって制御されている。
図8に示すように、合剤未塗工部35・36は、くせ付けロール50によってくせ付けが行われ複数の束35a・35a・・・、36a・36a・・・に集箔される。詳細には、合剤未塗工部35・36は、捲回内側から数えて複数周回ごとの一群(図示においては、五周ごとの一群)にまとめられて、群ごとに間隔を空けた状態で複数群に集箔される。言い換えれば、くせ付けロール50を巻芯34に対して進退移動させつつ合剤未塗工部35・36を押圧することによって、合剤未塗工部35・36の集箔が周期的に行われるくせ付けが施され、その結果、合剤未塗工部35・36には一定周期を有する複数の集箔部(束35a・35a・・・、及び束36a・36a・・・)が形成される。
このとき、各電極要素31・32・33が捲回されるにつれて、これらの捲回体である電極体30の径が大きくなる(図9に破線で示す曲線)。これに対して、合剤未塗工部35・36が所望の集箔形態を満足するように、くせ付けロール50を合剤未塗工部35・36に接触・押圧させる必要がある(図9に鎖線で示す曲線)。
これにより、捲回後に集箔する工程が不要となり、集電箔の製造誤差、捲回誤差等に左右されない集箔が可能となる。
従って、集電部である合剤未塗工部35・36に対して容易、かつ、高品質にくせ付けを施して集箔することが可能となる。
これにより、合剤未塗工部35・36のくせの大きさを高精度に制御でき、所望のくせ付け形態を容易に得ることができる。
従って、合剤未塗工部35・36と集電板37・38との接合品質を向上でき、電池10の製品品質を担保できる。
これによれば、くせ付けロール50により集箔部の一群に含まれる部位に対して、複数周回に亘って同一箇所にて押圧する状態が連続するため、一群の内側に位置する合剤未塗工部35・36を確実に押圧することができ、くせ付けの精度を向上できる。
これによれば、合剤未塗工部35・36を自然な傾斜形状に変形することができ、正極箔31及び負極箔32の合剤塗工部に加わる外力を最小限に留めることができる。従って、電極体30の集電部を精度良く集箔できる。
また、くせ付けロール50を巻芯34より上流側に配置しても良く、係る場合には、巻芯34の軸心方向とその反対方向の両方向にくせ付けを施すことが可能となり、所望のくせ付けを容易に実現できる。
Claims (5)
- 表面の一部に正極合剤が塗工された正極箔と、表面の一部に負極合剤が塗工された負極箔とをセパレータを介して積層した状態で捲回することにより形成される電極体を具備する電池を製造する方法であって、
前記電極体を捲回する際に、前記正極箔と前記負極箔との少なくとも一方における合剤の未塗工部にくせ付けを施すことによって、前記合剤未塗工部の前記電極体の径方向に周回の異なる複数枚を集箔する電池の製造方法。 - 前記電極体の捲回軸に対して進退移動可能に構成されるくせ付けロールを用いて、
前記くせ付けロールを進退移動させつつ前記合剤未塗工部を押圧することによって、前記合剤未塗工部の集箔が周期的に行われるようにくせ付けを施す請求項1に記載の電池の製造方法。 - 前記くせ付けロールは、前記電極体の捲回に伴う径方向の厚みの変化及び前記くせ付けの周期に応じて進退移動する請求項2に記載の電池の製造方法。
- 前記くせ付けロールは、前記捲回軸に対して近接した位置に配置され、捲回途中の前記電極体を直接押圧可能である請求項2又は3に記載の電池の製造方法。
- 前記くせ付けロールは、前記合剤未塗工部の先端側を底面とする円錐形状を有する請求項2~4の何れか一項に記載の電池の製造方法。
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KR1020127010189A KR101321260B1 (ko) | 2009-09-28 | 2009-09-28 | 전지의 제조 방법 |
PCT/JP2009/004937 WO2011036737A1 (ja) | 2009-09-28 | 2009-09-28 | 電池の製造方法 |
JP2011532818A JP5392352B2 (ja) | 2009-09-28 | 2009-09-28 | 電池の製造方法 |
CN200980161662.4A CN102576849B (zh) | 2009-09-28 | 2009-09-28 | 电池的制造方法 |
US13/497,848 US20120180308A1 (en) | 2009-09-28 | 2009-09-28 | Battery fabrication method |
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JP6439872B2 (ja) * | 2015-07-15 | 2018-12-19 | 日産自動車株式会社 | 輸送用ロール状電極、および輸送用ロール状電極の製造方法 |
JP6870591B2 (ja) * | 2017-11-24 | 2021-05-12 | トヨタ自動車株式会社 | 捲回電極体の製造方法 |
WO2021024734A1 (ja) * | 2019-08-08 | 2021-02-11 | 株式会社村田製作所 | 二次電池、電池パック、電子機器、電動工具及び電動車両 |
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JPH10261441A (ja) * | 1997-03-18 | 1998-09-29 | Japan Storage Battery Co Ltd | 非水電解質二次電池 |
JP2008066075A (ja) * | 2006-09-06 | 2008-03-21 | Hitachi Ltd | 非水電解質二次電池 |
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JPH10261441A (ja) * | 1997-03-18 | 1998-09-29 | Japan Storage Battery Co Ltd | 非水電解質二次電池 |
JP2008066075A (ja) * | 2006-09-06 | 2008-03-21 | Hitachi Ltd | 非水電解質二次電池 |
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