JP2008166030A - Manufacturing method of spiral electrode body, and manufacturing method of closed battery using this - Google Patents
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- JP2008166030A JP2008166030A JP2006351903A JP2006351903A JP2008166030A JP 2008166030 A JP2008166030 A JP 2008166030A JP 2006351903 A JP2006351903 A JP 2006351903A JP 2006351903 A JP2006351903 A JP 2006351903A JP 2008166030 A JP2008166030 A JP 2008166030A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000004804 winding Methods 0.000 claims abstract description 41
- 238000010079 rubber tapping Methods 0.000 claims abstract description 23
- 239000011149 active material Substances 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 27
- 238000003466 welding Methods 0.000 claims description 19
- 238000010894 electron beam technology Methods 0.000 claims description 2
- 239000011162 core material Substances 0.000 description 30
- 238000005516 engineering process Methods 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011889 copper foil Substances 0.000 description 5
- 239000007773 negative electrode material Substances 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 230000001678 irradiating effect Effects 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
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Classifications
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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
-
- 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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- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
本発明は、渦巻電極体の製造方法およびこれを用いた密閉型電池の製造方法に関し、より詳しくは渦巻電極体の電気接続方式に関する。 The present invention relates to a method of manufacturing a spiral electrode body and a method of manufacturing a sealed battery using the same, and more particularly to an electrical connection method of the spiral electrode body.
今日、携帯電話、ノートパソコン等の移動情報端末の高機能化・小型化および軽量化が急速に進展している。これらの端末の駆動電源として、高いエネルギー密度を有し、高容量であるリチウムイオン二次電池に代表される非水電解質二次電池が広く利用されている。 Today, mobile information terminals such as mobile phones and laptop computers are rapidly becoming more functional, smaller, and lighter. As a driving power source for these terminals, non-aqueous electrolyte secondary batteries represented by lithium ion secondary batteries having high energy density and high capacity are widely used.
特に帯状の電極芯体(集電体)に、正負活物質を塗着した正負極をセパレータを介して巻回してなる渦巻電極体を用いた電池は、ハイレート放電が必要とされる用途において広く使用されている。ニッケルカドニウム電池などのアルカリ蓄電池では、ハイレート放電を行うために、電極の巻取体の巻回軸方向端縁面に集電板が溶接されるものがある。ところが、リチウムイオン電池の電極芯体には、柔らかく且つ数十μm以下の非常に薄い材料が用いられているため(例えば、銅箔、アルミニウム箔)、電極芯体と集電板とを直接溶接することが困難である。渦巻電極体の側面をクランプして溶接する方法も考えられるが、巻き圧を充分に高めることができないので、巻きズレが生じてしまい、この方法においても電極芯体と集電板とを直接溶接することが困難である。 In particular, a battery using a spiral electrode body obtained by winding a positive and negative electrode coated with a positive and negative active material on a strip-shaped electrode core (current collector) through a separator is widely used in applications that require high-rate discharge. in use. Some alkaline storage batteries, such as nickel cadmium batteries, have a current collector plate welded to an end surface in the winding axis direction of an electrode winding body in order to perform high-rate discharge. However, since the electrode core of a lithium ion battery is made of a soft and very thin material of several tens of μm or less (for example, copper foil, aluminum foil), the electrode core and the current collector plate are directly welded. Difficult to do. A method of clamping and welding the side surface of the spiral electrode body is also conceivable, but the winding pressure cannot be increased sufficiently, resulting in winding displacement. Difficult to do.
このようなことから、従来の電池においては、電極芯体の一部に集電タブを取り付け、このタブと集電板とを溶接固定していたが、この種の電池は、車椅子や電動工具の駆動電源など起動時に大出力を必要とする用途での利用が拡大しており、これらの用途においては特にハイレート放電特性に優れた電池が求められる。然るに、従来のタブ集電方式では短時に大電流を取り出し難いという問題がある。 For this reason, in the conventional battery, a current collecting tab is attached to a part of the electrode core, and the tab and the current collecting plate are fixed by welding, but this type of battery is used for a wheelchair or a power tool. The use in applications that require high output at the time of startup, such as drive power supplies, is expanding, and in these applications, batteries that are particularly excellent in high-rate discharge characteristics are required. However, the conventional tab current collecting system has a problem that it is difficult to extract a large current in a short time.
ここで、電池の集電方法に関する技術としては、下記特許文献1〜10が挙げられる。 Here, the following patent documents 1-10 are mentioned as a technique regarding the current collection method of a battery.
特許文献1は、極板群の両端に極板の集電体をそれぞれ突出させ、その突出部を押圧して集電体自身によって平坦部を形成し、この平坦部に集電板を接合する技術であり、この技術によると、集電効率を高くでき、充放電時の温度上昇を小さくできるとされる。 In Patent Document 1, the current collectors of the electrode plates are protruded from both ends of the electrode plate group, the protrusions are pressed to form a flat portion by the current collector itself, and the current collector plate is joined to the flat portion. According to this technology, the current collection efficiency can be increased, and the temperature rise during charging and discharging can be reduced.
特許文献2は、渦巻状電極群の正極板端縁の芯体露出部あるいは負極板端縁の芯体露出部のうちの少なくとも一方の芯体露出部を折り曲げる技術であり、この技術によると、高率放電特性を高めることができるとされる。 Patent Document 2 is a technique for bending at least one core exposed part of the core exposed part of the positive electrode plate edge or the core exposed part of the negative electrode plate edge of the spiral electrode group. According to this technique, It is said that the high rate discharge characteristics can be improved.
特許文献3は、ゼリーロール状に巻き込まれた積層電極の両側端部からそれぞれ外方に向かって第1の電極と第2の電極とをそれぞれ突出させ、側端面に互いに平行な一対のスリットを形成し、そのスリットに仕切られた部分の電極を折り曲げて、積層電極の側端面よりも内方位置に電極面を形成し、この電極面に集電タブを接続する技術であり、この技術によると、集電能力を向上させることができるとされる。 In Patent Document 3, a first electrode and a second electrode are respectively projected outward from both side end portions of a laminated electrode wound in a jelly roll shape, and a pair of slits parallel to each other are formed on the side end surfaces. This is a technique for forming an electrode surface at a position inward of the side end face of the laminated electrode by bending the electrode of the portion partitioned by the slit, and connecting a current collecting tab to this electrode face. It is said that the current collecting ability can be improved.
特許文献4は、負極の面方向端部および正極の面方向端部のうちの一方に設けられた屈曲部を形成し、この屈曲部を集電板に対して面接触させる技術であり、この技術によると、負極および正極に負極集電板および正極集電板をより確実且つ簡単に接続できるとされる。 Patent Document 4 is a technique of forming a bent portion provided at one of the surface direction end of the negative electrode and the surface direction end of the positive electrode, and bringing the bent portion into surface contact with the current collector plate. According to the technology, the negative electrode current collector plate and the positive electrode current collector plate can be more reliably and easily connected to the negative electrode and the positive electrode.
特許文献5は、負極の面方向端縁および前記正極の面方向端縁のうちの一方に折曲部を設ける技術であり、この技術によると、負極および正極の短絡を生じにくくできるとされる。 Patent Document 5 is a technique of providing a bent portion at one of the edge in the surface direction of the negative electrode and the edge in the surface direction of the positive electrode. According to this technique, it is difficult to cause a short circuit between the negative electrode and the positive electrode. .
特許文献6は、電極体の上面および下面の少なくとも一方に、正極板および負極板のいずれかの芯材露出部を突出させ、この突出部の先端自身によって平坦部が形成し、この平坦部に集電板を接合する技術であり、この技術によると、ラフユースにあっても安定して優れた集電特性が得られるとされる。 In Patent Document 6, at least one of an upper surface and a lower surface of an electrode body is made to protrude a core material exposed portion of either a positive electrode plate or a negative electrode plate, and a flat portion is formed by the tip of the protruding portion itself. It is a technology for joining current collector plates, and according to this technology, it is said that stable current collecting characteristics can be obtained even in rough use.
特許文献7は、極板群の巻回幅方向に突出した正極側帯状集電部および/または負極側帯状集電部が、巻回軸心から放射状の配置で形成された切り込みまたは切欠きによって複数の接続片に分割され、且つ各接続片が巻回軸心に向け直角に折り曲げられ、この各接続片と集電体とを接合する技術であり、この技術によると、優れた耐落下特性が得られるとされる。 Patent Document 7 discloses that the positive electrode side band-shaped current collector and / or the negative electrode side band-shaped current collector protruding in the winding width direction of the electrode plate group are formed by notches or notches formed in a radial arrangement from the winding axis. It is divided into a plurality of connection pieces, and each connection piece is bent at right angles toward the winding axis, and this connection piece is joined to the current collector. According to this technology, excellent drop resistance characteristics Is obtained.
特許文献8は、セパレータの負極側が、電極群の中心方向に折り曲げられ、かつフレキシブルな基体を有する負極板が負極側端面の一部に、活物質がほとんど存在しない電極端部を有し、該電極端部の少なくとも一部を、折り曲げられた該セパレータから露出させ、該電極端部の露出している部分を、負極側集電板を介して、或いは直接、電池端子或いは電槽と電気的に接続した電極群を用いる技術であり、この技術によると、極板からの活物質脱落による短絡を防止できるとされる。 In Patent Document 8, the negative electrode side of the separator is bent in the center direction of the electrode group, and the negative electrode plate having a flexible base has an electrode end portion in which almost no active material exists on a part of the negative electrode side end surface, At least a part of the electrode end is exposed from the folded separator, and the exposed part of the electrode end is electrically connected to the battery terminal or the battery case through the negative current collector plate or directly. According to this technique, it is said that it is possible to prevent a short circuit due to the active material falling off the electrode plate.
特許文献9は、正極板及び/又は負極板の集電体(電極芯体、以下同様)は、その幅方向の一方端側に活物質が塗着されない集電体露出部を形成し、集電体露出部はその幅方向の活物質塗着端からセパレータの幅と略同一位置に至るまでの部位を絶縁被覆し、前記極板群に形成したとき端部から突出した集電体露出部を押圧して折り曲げ形成された溶接面に集電板を溶接する技術であり、この技術によると、集電部と集電板との電気的な接続が安定で、しかも集電体と集電板との溶接強度を十分確保できるとされる。 Patent Document 9 discloses that a current collector (electrode core, hereinafter the same) of a positive electrode plate and / or a negative electrode plate forms a current collector exposed portion to which an active material is not applied on one end side in the width direction. The current-exposed portion is a current-exposed portion that protrudes from the end when it is formed on the electrode plate group by insulatingly covering a portion from the active material coating end in the width direction to the position substantially the same as the width of the separator. Is a technology that welds the current collector plate to the welded surface that is bent by pressing, and according to this technology, the electrical connection between the current collector and the current collector plate is stable, and the current collector and the current collector are It is said that sufficient welding strength with the plate can be secured.
特許文献10は、帯状の集電体に活物質が塗着された正極板と、帯状の集電体に活物質が塗着された負極板との間に帯状のセパレータを配して巻回した極板群の上下両端面に集電体が突出するように構成し、巻回した最外周部位を除く他の部位を押圧して平坦部位を作成し、平坦部位に集電体を溶接した後に、最外周部位を集電体に溶接する技術であり、この技術によると、集電体と集電板との間の接合強度及び電流容量を向上できるとされる。 In Patent Document 10, a strip-shaped separator is disposed between a positive electrode plate in which an active material is applied to a strip-shaped current collector and a negative electrode plate in which an active material is applied to a strip-shaped current collector. The current collector is constructed so that the current collector protrudes from the upper and lower end faces of the electrode plate group, and other parts except the outermost wound part are pressed to create a flat part, and the current collector is welded to the flat part. Later, it is a technique of welding the outermost peripheral part to the current collector, and according to this technique, the joint strength and current capacity between the current collector and the current collector plate can be improved.
これらの技術では、集電体を折り曲げる必要があるが、薄く柔らかい集電体に力を加えて折り曲げようとすると、集電体の変形、破損により、平坦部位を作製できず、巻取体に集電板を良好な状態で溶接できないおそれがある。 With these technologies, it is necessary to bend the current collector. However, if you try to fold the current collector by applying force to a thin and soft current collector, the flat part cannot be produced due to deformation or breakage of the current collector. There is a risk that the current collector plate cannot be welded in good condition.
本発明は、上記に鑑みなされたものであって、ハイレート放電特性に優れた電池を製造することのできる渦巻電極体の製造方法およびこれを用いた電池の製造方法を提供することを目的とする。 This invention is made in view of the above, Comprising: It aims at providing the manufacturing method of the spiral electrode body which can manufacture the battery excellent in the high-rate discharge characteristic, and the manufacturing method of a battery using the same. .
上記課題を解決するための渦巻電極体の製造方法にかかる本発明は、帯状の電極芯体に活物質が塗着されてなる第1電極と、前記第1電極とは極性の異なる電極であって帯状の電極芯体に活物が塗着されてなる第2電極と、をセパレータを介して巻回して渦巻電極体となす渦巻電極体の製造方法において、前記第1電極の幅方向の少なくとも一方縁に活物質の塗着されていない芯体露出部が形成されており、当該第1電極とセパレータと第2電極とを、当該第1電極の芯体露出部をセパレータ幅を超えて幅方向前方に突出させた状態で重ね合わせ、前記三者を長手方向に巻回して、一方面に前記第1電極の芯体露出部が突出した巻取体を作製する巻取体作製ステップと、前記巻取体をその軸方向に上下運動させ、前記一方面をタッピングすることにより、突出した芯体露出部を巻取体の本体側に折り曲げて、前記一方面を平坦にするタッピングステップと、を備えることを特徴とする。 The present invention according to the method of manufacturing a spiral electrode body for solving the above-described problems is a first electrode in which an active material is applied to a strip-shaped electrode core and an electrode having a different polarity from the first electrode. In the method of manufacturing a spiral electrode body in which a second electrode having an active material coated on a strip-shaped electrode core is wound through a separator to form a spiral electrode body, at least in the width direction of the first electrode A core exposed portion not coated with an active material is formed on one edge, and the first electrode, the separator, and the second electrode are connected to each other, and the core exposed portion of the first electrode extends beyond the separator width. A winding body producing step of producing a winding body in which the core body exposed portion of the first electrode is projected on one surface by overlapping the three members in a longitudinal direction and winding the three members in the longitudinal direction; The winding body is moved up and down in the axial direction, and the one surface is tapped. And by, by bending the substrate exposed portion protruding body of the winding body, characterized in that it comprises a tapping step of flattening said one side.
この構成では、タッピング法を用いるタッピングステップを有するが、タッピング法によると巻取体の一方面の全面(軸方向に直交する面の全面)に均等で適度な強さの力(電極体の自重による力)を作用させることができるので、前記一方面に突出させた第1電極の芯体露出部が、破断することなく、渦巻電極体の軸方向に略直交する方向に折り曲げられ巻取体の軸方向に広がった形状が形成される。この平坦面では、第1電極の芯体が占める面積(通電可能面積)が飛躍的に拡大する。したがって、この平坦面に電池集電板を当接させた場合、良好な状態で集電板を巻取体に溶接ができ、両者の接触面積が大きくなり、集電効率が高まるので、ハイレート放電特性が顕著に向上することになる。 In this configuration, there is a tapping step using a tapping method, but according to the tapping method, a force of equal and moderate strength (self-weight of the electrode body) is applied to the entire surface of one surface of the winding body (the entire surface orthogonal to the axial direction). Therefore, the core exposed portion of the first electrode protruded from the one surface is bent in a direction substantially perpendicular to the axial direction of the spiral electrode body without breaking, and the wound body A shape extending in the axial direction is formed. On this flat surface, the area occupied by the core of the first electrode (area that can be energized) increases dramatically. Therefore, when the battery current collector plate is brought into contact with this flat surface, the current collector plate can be welded to the winding body in a good state, the contact area between the two is increased, and the current collection efficiency is increased. The characteristics are remarkably improved.
上記構成において、前記第2電極にも幅方向の少なくとも一方縁に活物質の塗着されていない芯体露出部が形成されており、前記巻取体作製ステップは、一方面に前記第1電極の芯体露出部がセパレータ幅を超えて突出し、且つ他方面に前記第2電極の芯体露出部がセパレータ幅を超えて突出した巻取体を作製するステップであり、前記タッピングステップは、前記一方面および他方面に芯体露出部が突出した巻取体を、その軸方向に上下運動させ、前記一方面および他方面をタッピングするステップである構成とすることができる。 The said structure WHEREIN: The core exposed part which the active material is not applied to at least one edge of the width direction is formed also in the said 2nd electrode, The said winding body preparation step is a said 1st electrode on one surface. The core exposed portion of the second electrode protrudes beyond the separator width, and the core exposed portion of the second electrode protrudes beyond the separator width on the other surface, and the tapping step includes the step of The winding body in which the core body exposed portion protrudes from the one surface and the other surface can be moved up and down in the axial direction to tapping the one surface and the other surface.
この方法を用いると、第2電極にも平坦面を形成することができ、両極で集電効率が高まるので、さらにハイレート放電特性を向上できる。 When this method is used, a flat surface can be formed also on the second electrode, and the current collection efficiency is increased at both electrodes, so that the high-rate discharge characteristics can be further improved.
上記構成において、前記巻取体作製ステップの前に、巻取体作製ステップで使用する第1電極の芯体露出部に折り曲げ線を形成する折り曲げ線形成ステップを更に備える構成とすることができる。 The said structure WHEREIN: It can be set as the structure further provided with the fold line formation step which forms a fold line in the core body exposed part of the 1st electrode used at a wound body preparation step before the said winding body preparation step.
この方法を用いると、タッピングステップにおいて円滑に折り曲げ線を基軸として集電体が電池中央方向側に折れ曲がるので、電気接続するのに好都合な平坦面を形成できる。 When this method is used, the current collector is smoothly bent toward the center of the battery in the tapping step with the fold line as a base axis, so that a flat surface convenient for electrical connection can be formed.
上記構成において、前記巻取体作製ステップの後、前記タッピングステップの前に、前記芯体露出部の突出した巻取体に巻取体外周から芯体露出部中心に向かう圧力を作用させ、芯体露出部に複数の溝を放射線状に形成する折り曲げ補助溝形成ステップを更に備える構成とすることができる。 In the above configuration, after the winding body preparation step and before the tapping step, a pressure from the outer periphery of the winding body toward the center of the core body exposed part is applied to the winding body from which the core body exposed part protrudes, It can be set as the structure further provided with the bending auxiliary groove formation step which forms a some groove | channel in a body exposure part radially.
この方法を用いると、タッピングによる折れ曲がり方向が、巻取体外周から中心に向かう圧力で変形させた方向に誘導されるため、円滑に電気接続するのに好都合な平坦面を形成できる。この折り曲げ補助溝は、3本以上であることが好ましく、より好ましくは4本以上とする。 When this method is used, the bending direction due to tapping is induced in the direction deformed by the pressure from the outer periphery of the winding body toward the center, and thus a flat surface convenient for smooth electrical connection can be formed. The number of bending assist grooves is preferably 3 or more, more preferably 4 or more.
上記課題を解決するための電池の製造方法にかかる本発明は、上記に記載の方法により得られた渦巻電極体の前記一方面に、前記渦巻電極体から電流を取り出す集電板を溶接することを特徴とする。 The present invention relating to a method for manufacturing a battery for solving the above-mentioned problems is to weld a current collecting plate for taking out current from the spiral electrode body to the one surface of the spiral electrode body obtained by the method described above. It is characterized by.
この構成によると、渦巻電極体の平坦面は、従来のタブよりも電気接続に利用し得る接触面積が格段に大きいので、電池の集電板との接触面積を飛躍的に増大させることができ、これによりハイレート放電特性が顕著に向上する。 According to this configuration, since the contact area that can be used for electrical connection is much larger than the conventional tab, the flat surface of the spiral electrode body can dramatically increase the contact area with the current collector plate of the battery. This significantly improves the high rate discharge characteristics.
この溶接としては、抵抗溶接、超音波溶接、又は高エネルギー線による溶接を用いることができ、前記高エネルギー線による溶接としては、レーザ光又は電子ビームを用いることができる。 As this welding, resistance welding, ultrasonic welding, or welding with a high energy beam can be used. As the welding with the high energy beam, a laser beam or an electron beam can be used.
以上説明したように、本発明によると、簡単な方法で渦巻電極体と集電板を良好な状態で溶接でき、ハイレート放電特性に優れた電池を歩留まりよく製造することができる。 As described above, according to the present invention, the spiral electrode body and the current collector plate can be welded in a good state by a simple method, and a battery excellent in high rate discharge characteristics can be manufactured with a high yield.
以下に、本発明を実施するための最良の形態を、図面を用いて詳細に説明する。図1は渦巻電極体を作製するステップを示す説明図であり、図2はタッピング工程を示す説明図であり、図3は電極体と集電板との溶接工程を示す図である。 The best mode for carrying out the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing steps for producing a spiral electrode body, FIG. 2 is an explanatory view showing a tapping process, and FIG. 3 is a view showing a welding process between the electrode body and a current collector plate.
(巻取体作製ステップ)
図1(a)に示すように、幅方向の少なくとも一方縁に活物質の塗着されていない芯体露出部が形成されている負極(第1電極)に、ローラーを用いて折り曲げ線を形成する。この後、図1(b)に示すように、負極とセパレータと正極とを、負極の芯体露出部をセパレータ幅を超えて幅方向前方に突出させた状態で重ね合わせ、この三者を長手方向に巻回して、一方面に負極の芯体露出部が突出した巻取体を作製する(図1(c)参照)。
(Winding body production step)
As shown in FIG. 1A, a fold line is formed by using a roller on a negative electrode (first electrode) in which a core exposed portion not coated with an active material is formed on at least one edge in the width direction. To do. Thereafter, as shown in FIG. 1 (b), the negative electrode, the separator, and the positive electrode are overlapped with the core exposed portion of the negative electrode protruding beyond the separator width forward in the width direction. It winds in the direction and produces a wound body in which the core exposed portion of the negative electrode protrudes on one surface (see FIG. 1C).
(折り曲げ補助溝形成ステップ)
この後、芯体露出部の突出した巻取体の一方面に、巻取体外周から中心に向かう圧力を作用させ、前記一方面に複数の溝を放射線状に形成する(図2(b)、(c)参照)。
(Bending auxiliary groove forming step)
Thereafter, a pressure from the outer periphery of the winding body toward the center is applied to one surface of the winding body from which the core body exposed portion protrudes, and a plurality of grooves are formed radially on the one surface (FIG. 2B). (See (c)).
(タッピングステップ)
この後、高さ約20mmの高さからタッピングを50回程度行う。(図2(d)参照)、放射状の折り曲げ補助溝を設けている為、一方面から突出した負極芯体が径方向外側には屈折せず、全体が略均等に逐次径方向内側に向けて折り曲がるように塑性変形されることになり、多少の皺を生じさせながらも全体として平坦な平坦面が形成されることになる。これにより渦巻電極体が完成する(図2(e)参照)。
(Tapping step)
Thereafter, tapping is performed about 50 times from a height of about 20 mm. (Refer to FIG. 2 (d).) Since the radial bending auxiliary groove is provided, the negative electrode core protruding from one surface is not refracted radially outward, and the whole is directed almost uniformly toward the radially inner side. It will be plastically deformed so that it will be bent, and a flat surface will be formed as a whole while producing some wrinkles. Thereby, the spiral electrode body is completed (see FIG. 2E).
この後、図3に示すように、当該渦巻電極体の平坦面と集電板とを溶接する。この後、当該電極体を電池缶内に挿入し、集電板と電池缶とをレーザ溶接し、その後電解液を注液し、開口部を封口して、電池が完成する。 Thereafter, as shown in FIG. 3, the flat surface of the spiral electrode body and the current collector plate are welded. Thereafter, the electrode body is inserted into the battery can, the current collector plate and the battery can are laser welded, the electrolyte is then injected, the opening is sealed, and the battery is completed.
(実施例)
以下に、実施例を参照して、本発明をより具体的に説明する。
(Example)
Hereinafter, the present invention will be described more specifically with reference to examples.
(正極の作製)
コバルト酸リチウムからなる正極活物質と、炭素からなる導電剤と、ポリビニリデンフルオライドからなる結着剤と、N−メチルピロリドンと、を混合して正極活物質スラリーを調整した。この正極活物質スラリーを、厚み15μmのアルミ箔から成る正極集電体の両面に塗布し、乾燥、圧延して、正極材料層が形成されたL2050mm×W50mm×T0.09mmの寸法の正極板を得た。
(Preparation of positive electrode)
A positive electrode active material slurry made of lithium cobalt oxide was prepared by mixing a conductive agent made of carbon, a binder made of polyvinylidene fluoride, and N-methylpyrrolidone. The positive electrode active material slurry was applied to both surfaces of a positive electrode current collector made of an aluminum foil having a thickness of 15 μm, dried and rolled to obtain a positive electrode plate having a size of L2050 mm × W50 mm × T 0.09 mm on which a positive electrode material layer was formed. Obtained.
(負極の作製)
人造黒鉛からなる負極活物質と、ポリビニリデンフルオライドからなる結着剤と、N−メチルピロリドンと、を混合して負極活物質スラリーを調整した。この負極活物質スラリーを、厚み10μmの銅箔から成る負極芯体の両面に一側縁部に幅7mmの非塗工部を残した状態で塗布し、乾燥、圧延して、負極材料層が形成されたL2150mm×W60mm×T0.08mmの寸法の負極板を得た。この後、図1(a)に示すようにローラーで折り曲げ基線を形成した。
(Preparation of negative electrode)
A negative electrode active material slurry made of artificial graphite, a binder made of polyvinylidene fluoride, and N-methylpyrrolidone were mixed. This negative electrode active material slurry was applied to both sides of a negative electrode core made of a copper foil having a thickness of 10 μm, leaving a non-coated portion with a width of 7 mm on one side edge, dried and rolled, and the negative electrode material layer was A formed negative electrode plate having dimensions of L2150 mm × W60 mm × T0.08 mm was obtained. Thereafter, a bent base line was formed with a roller as shown in FIG.
(巻取体作製ステップ)
上記正極板、負極板を、微多孔ポリエチレンフィルムから成る厚さ22μmのセパレータを介して互いに対向された状態(図1(b)参照)に配置し、巻回して巻取体を作製した。
(Winding body production step)
The positive electrode plate and the negative electrode plate were placed in a state of facing each other (see FIG. 1B) with a separator made of a microporous polyethylene film having a thickness of 22 μm (see FIG. 1B), and wound to prepare a wound body.
(折り曲げ補助溝形成ステップ)
図2(b)、(c)に示すように、芯体露出部の突出した巻取体の一方面に巻取体外周から中心に向かう圧力を作用させ、8本の折り曲げ補助溝を放射線状に形成した。
(Bending auxiliary groove forming step)
As shown in FIGS. 2 (b) and 2 (c), pressure toward the center from the outer periphery of the winding body is applied to one surface of the winding body from which the core exposed portion protrudes, and the eight folding auxiliary grooves are formed in a radial pattern. Formed.
(タッピングステップ)
この後、電極体を電極体より径が1mm程度大きい筒状の治具に入れ、高さ20mmの位置から50回タッピングを行った(図2(d)参照)。これにより、負極集電板が塑性変形され、平坦面が形成された(図2(e)参照)。
(Tapping step)
Thereafter, the electrode body was put into a cylindrical jig having a diameter about 1 mm larger than the electrode body, and tapping was performed 50 times from a position having a height of 20 mm (see FIG. 2D). Thereby, the negative electrode current collector plate was plastically deformed to form a flat surface (see FIG. 2E).
(溶接)
図3に示すように、平坦面を形成した渦巻電極体の平坦面を集電板に押し付けるように、治具で配置して両者を圧接させた状態で、集電板の表面の複数箇所を中心部から外周まで放射状にレーザビームを照射することによって集電板と平坦部をレーザ溶接した。溶接条件は以下のとおり。
(welding)
As shown in FIG. 3, in a state where the flat surface of the spiral electrode body on which the flat surface is formed is pressed against the current collector plate so as to press the flat surface, a plurality of locations on the surface of the current collector plate are arranged. The current collector plate and the flat portion were laser welded by irradiating a laser beam radially from the center to the outer periphery. The welding conditions are as follows.
セパレータがズレることのない力で、集電板と圧接し、KATAOKA製KLY−HP300βのYAGレーザを用いて、周波数150Hz、パルスレーザ出力1.0kW、加工速度200mm/Sにて溶接。 The separator is pressed with a force that does not shift, and is welded at a frequency of 150 Hz, a pulse laser output of 1.0 kW, and a machining speed of 200 mm / S using a KAGOKA KLY-HP300β YAG laser.
(電池の組み立て)
この集電板を接合した仕掛品を電池缶内に挿入後、外装缶、電池蓋と溶接し、電解液とともに収容して真空含浸させ、電池蓋で密閉することにより、リチウムイオン二次電池を作製した。
(Battery assembly)
After the work-in-process with the current collector plate joined is inserted into the battery can, it is welded to the outer can and the battery lid, stored with the electrolyte, vacuum impregnated, and sealed with the battery lid. Produced.
(比較例)
上記折り曲げ補助溝形成ステップおよびタッピングを行わなかったこと以外は、実施例と同様にして比較例にかかる電池を作製した。
(Comparative example)
A battery according to a comparative example was fabricated in the same manner as in the example except that the bending auxiliary groove forming step and tapping were not performed.
評価としては、外観確認後、集電板を引っ張り剥がして、集電板の状態、銅箔(負極集電体)の集電板への残存を確認した。また、断面を切断して、溶接状態を確認した。この結果を下記表1に示す。 As the evaluation, after the appearance was confirmed, the current collector plate was pulled and peeled to confirm the state of the current collector plate and the remaining copper foil (negative electrode current collector) on the current collector plate. Moreover, the cross section was cut | disconnected and the welding state was confirmed. The results are shown in Table 1 below.
上記表1から、実施例ではすべての電池において銅箔の集電板への残存がおきているのに対し、比較例ではすべてにおいて集電板の焦げ、穴開きが発生し、溶接箇所の銅箔残存もバラツキが生じていることがわかる。 From Table 1 above, the copper foil remains on the current collector plate in all the batteries in the examples, whereas in the comparative example, the current collector plate is burnt and perforated in all of the batteries. It can be seen that the remaining foil also varies.
このことは、次のように考えられる。実施例では、タッピングにより平坦面を形成しているため、集電体と集電板とが確実に溶接される。このため、集電板を引き剥がすと、溶接された集電体が集電板に残存する。他方、比較例では、平坦面が形成されていないため、集電体と集電板との溶接が十分に行われず、集電板の焦げ、穴開きが発生し、溶接箇所の銅箔残存もバラツキが生じる。 This is considered as follows. In the embodiment, since the flat surface is formed by tapping, the current collector and the current collector plate are reliably welded. For this reason, when the current collector plate is peeled off, the welded current collector remains on the current collector plate. On the other hand, in the comparative example, since the flat surface is not formed, the current collector and the current collector plate are not sufficiently welded, the current collector plate is burnt, the perforation occurs, and the copper foil remaining at the welded portion also remains. Variations occur.
また、実施例では、平坦面が形成されているので、確実に当該平坦面と集電板とが溶接される。他方、比較例では、渦巻電極体と集電板とが十分に溶接されないため、レーザ照射により溶けた集電板が電極体の極板間の隙間に落ちて、焦げや穴開きが生じる。 In the embodiment, since the flat surface is formed, the flat surface and the current collector plate are reliably welded. On the other hand, in the comparative example, since the spiral electrode body and the current collector plate are not sufficiently welded, the current collector plate melted by the laser irradiation falls into the gap between the electrode plates of the electrode body, causing charring and perforation.
以上のことから、本発明の製造方法では、集電体と集電板との安定した溶接が可能となり、電池性能、品質と生産性の向上に効果的であることが分かる。 From the above, it can be seen that the manufacturing method of the present invention enables stable welding between the current collector and the current collector plate, and is effective in improving battery performance, quality and productivity.
なお、上記実施例では負極を折り曲げたが、正極を折り曲げる構成であってもよく、両者ともに折り曲げる構造であってもよい。また、本発明は、渦巻電極体を備える電池すべてに応用が可能であり、一次電池でもよく、二次電池でもよい。 In addition, although the negative electrode was bent in the said Example, the structure which bends a positive electrode may be sufficient and the structure which both bends may be sufficient. In addition, the present invention can be applied to all batteries including a spiral electrode body, and may be a primary battery or a secondary battery.
以上説明したように、本発明によると、ハイレート放電特性に優れた電池を低コストで提供できるので、産業上の意義は大きい。 As described above, according to the present invention, a battery excellent in high-rate discharge characteristics can be provided at a low cost, and thus has great industrial significance.
Claims (7)
前記第1電極の幅方向の少なくとも一方縁に活物質の塗着されていない芯体露出部が形成されており、
当該第1電極とセパレータと第2電極とを、当該第1電極の芯体露出部をセパレータ幅を超えて幅方向前方に突出させた状態で重ね合わせ、前記三者を長手方向に巻回して、一方面に前記第1電極の芯体露出部が突出した巻取体を作製する巻取体作製ステップと、
前記巻取体をその軸方向に上下運動させ、前記一方面をタッピングすることにより、突出した芯体露出部を巻取体の本体側に折り曲げて、前記一方面を平坦にするタッピングステップと、
を備えることを特徴とする渦巻電極体の製造方法。 A first electrode in which an active material is applied to a band-shaped electrode core; and a second electrode in which the first electrode is an electrode having a different polarity and the active material is applied to a band-shaped electrode core; In the method of manufacturing a spiral electrode body that is wound through a separator to form a spiral electrode body,
A core exposed portion not coated with an active material is formed on at least one edge in the width direction of the first electrode,
The first electrode, the separator, and the second electrode are overlapped with the core exposed portion of the first electrode protruding forward in the width direction beyond the separator width, and the three parties are wound in the longitudinal direction. A winding body manufacturing step for manufacturing a winding body in which the core exposed portion of the first electrode protrudes on one surface;
A tapping step in which the winding body is moved up and down in the axial direction, and the one surface is tapped to bend the protruding core body exposed portion to the main body side of the winding body to flatten the one surface;
A process for producing a spiral electrode body, comprising:
前記第2電極にも幅方向の少なくとも一方縁に活物質の塗着されていない芯体露出部が形成されており、
前記巻取体作製ステップは、一方面に前記第1電極の芯体露出部がセパレータ幅を超えて突出し、且つ他方面に前記第2電極の芯体露出部がセパレータ幅を超えて突出した巻取体を作製するステップであり、
前記タッピングステップは、前記一方面および他方面に芯体露出部が突出した巻取体を、その軸方向に上下運動させ、前記一方面および他方面をタッピングするステップである、
ことを特徴とすることを特徴とする渦巻電極体の製造方法。 In the manufacturing method of the spiral electrode body according to claim 1,
A core exposed portion not coated with an active material is formed on at least one edge in the width direction also in the second electrode,
In the winding body manufacturing step, the core body exposed portion of the first electrode protrudes beyond the separator width on one side, and the core body exposed portion of the second electrode protrudes beyond the separator width on the other side. A step of making a body,
The tapping step is a step of tapping the one surface and the other surface by vertically moving the winding body in which the core body exposed portion protrudes from the one surface and the other surface in the axial direction.
A method of manufacturing a spiral electrode body, characterized in that
前記巻取体作製ステップの前に、巻取体作製ステップで使用する芯体露出部に折り曲げ線を形成する折り曲げ線形成ステップを更に備える、
ことを特徴とする渦巻電極体の製造方法。 In the manufacturing method of the spiral electrode body according to claim 1 or claim 2,
Before the winding body manufacturing step, further comprising a fold line forming step of forming a fold line in the core exposed portion used in the winding body manufacturing step,
A method of manufacturing a spiral electrode body.
前記巻取体作製ステップの後、前記タッピングステップの前に、前記芯体露出部の突出した巻取体の前記芯体露出部に巻取体外周から前記芯体露出部中心に向かう圧力を作用させ、前記芯体露出部に複数の溝を放射線状に形成する折り曲げ補助溝形成ステップを更に備える、
ことを特徴とする渦巻電極体の製造方法。 In the manufacturing method of the spiral electrode body according to claim 1 or claim 2,
After the winding body manufacturing step and before the tapping step, a pressure from the outer periphery of the winding body toward the center of the core body exposed portion acts on the core body exposed portion of the winding body from which the core body exposed portion protrudes. And further comprising a bending auxiliary groove forming step for forming a plurality of grooves radially in the core exposed portion,
A method of manufacturing a spiral electrode body.
ことを特徴とする密閉型電池の製造方法。 A current collector plate for taking out current from the spiral electrode body is welded to the core body exposed portion of the spiral electrode body obtained by the method according to any one of claims 1 to 4.
A method for producing a sealed battery, comprising:
前記溶接が、抵抗溶接、超音波溶接、又は高エネルギー線による溶接である、
ことを特徴とする密閉型電池の製造方法。 In the manufacturing method of the sealed battery according to claim 5,
The welding is resistance welding, ultrasonic welding, or welding with high energy rays.
A method for producing a sealed battery, comprising:
前記高エネルギー線が、レーザ光又は電子ビームである、
ことを特徴とする密閉型電池の製造方法。 In the manufacturing method of the sealed battery according to claim 6,
The high energy beam is a laser beam or an electron beam;
A method for producing a sealed battery, comprising:
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