WO2014188774A1 - Laminated-type secondary battery manufacturing method and manufacturing device - Google Patents

Laminated-type secondary battery manufacturing method and manufacturing device Download PDF

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Publication number
WO2014188774A1
WO2014188774A1 PCT/JP2014/058176 JP2014058176W WO2014188774A1 WO 2014188774 A1 WO2014188774 A1 WO 2014188774A1 JP 2014058176 W JP2014058176 W JP 2014058176W WO 2014188774 A1 WO2014188774 A1 WO 2014188774A1
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WIPO (PCT)
Prior art keywords
heat
lead terminal
welding
insulating material
secondary battery
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PCT/JP2014/058176
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French (fr)
Japanese (ja)
Inventor
大樹 藤原
泰元 金
松岡　孝
橋本　靜生
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日産自動車株式会社
富士インパルス株式会社
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Priority to JP2015518132A priority Critical patent/JP6019224B2/en
Publication of WO2014188774A1 publication Critical patent/WO2014188774A1/en

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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
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
    • H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
    • H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
    • H01M50/1245—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure characterised by the external coating on the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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

Definitions

  • the present invention relates to a method and apparatus for manufacturing a secondary battery called a laminate type or a thin type.
  • a laminated pack type (thin type) secondary battery represented by a lithium ion secondary battery a laminate type in which a battery element (power generation element) including a positive electrode, a negative electrode, and an electrolyte as electrodes is used as an exterior body.
  • the lead terminals surrounded by the outer film and electrically connected to the current collectors of the positive electrode and the negative electrode are led out of the outer film, and the peripheral edge of the outer film is formed into, for example, a rectangular bag by heat welding. Sealing or sealing treatment is performed to ensure airtightness as a battery and prevent leakage of the electrolyte inside.
  • covered the front and back both surfaces of the aluminum foil with the resin film, for example is used as the said exterior film.
  • Patent Document 1 As a specific means for performing heat welding on the exterior film, for example, as described in Patent Document 1, a so-called hot plate type pressure treatment that is always heated by incorporating a heat transfer heater is used. The outer peripheral film is sandwiched from both the front and back surfaces by the pressure jig, and heat welding is performed.
  • the present invention has been made paying attention to such a problem, and in particular, when performing thermal welding on the side portion of the exterior film from which the lead terminal is led out, by making the welding temperature uniform, it is possible to prevent thermal welding failure. It is intended to suppress the occurrence.
  • the present invention in applying heat welding by pressing and restraining the peripheral portion of the exterior film with a heat welding jig provided with a heater on the contact surface side with the exterior film, in the portion corresponding to the terminal portion of the electrode, The heat welding is performed with a heat insulating material interposed between the jig body of the heat welding jig and the heater.
  • the welding temperature can be made uniform between the portion where the terminal portion of the electrode is led out and the portion where the electrode terminal portion is not, and the occurrence of poor heat welding can be suppressed.
  • a highly reliable sealing or sealing process can be performed on the exterior film of the secondary battery.
  • FIG. 1 is a perspective view showing a schematic structure of a laminated lithium ion secondary battery applied to the practice of the present invention.
  • FIG. 2 is an exploded perspective view of the laminated lithium ion secondary battery shown in FIG. 1.
  • FIG. 2 is a diagram showing a heat welding apparatus as an embodiment of a manufacturing apparatus for a laminate type secondary battery according to the present invention, and is an enlarged cross-sectional explanatory view taken along line AA of FIG. It is the figure which expanded the left half part of FIG. 3, (A) is sectional drawing which shows the state from which the upper and lower heat welding jigs have separated, (B) is the upper and lower heat welding jigs approaching, and laminated film Sectional drawing which shows the state restrained by pressure.
  • FIG. 5 is an enlarged cross-sectional view taken along line BB in FIG.
  • FIG. 5 is an enlarged sectional view taken along the line CC in FIG.
  • FIG. 1 shows a lithium ion secondary battery (hereinafter, referred to as a laminate type secondary battery).
  • FIG. 2 shows an exploded perspective view of the schematic structure of the battery. This battery is used, for example, as a unit cell or a single battery of a lithium ion battery for an electric vehicle.
  • a lead terminal (positive electrode terminal portion) 2 as a positive electrode terminal and a lead terminal (negative electrode portion) 3 as a negative electrode terminal are led out to the outside.
  • the film is housed and sealed by a rectangular laminated film outer package 4 composed of two upper and lower laminated films 4a and 4b as an outer film.
  • the four circumferences of the laminate film outer package 4 are hermetically sealed or sealed by heat welding.
  • the four-round heat welded portion is denoted by reference numeral 6.
  • a battery element including a positive electrode and a negative electrode as electrodes, a separator, and an electrolyte solution is surrounded by a laminate film outer package 4, and each positive electrode and negative electrode current collector is enclosed.
  • the lead terminals 2 and 3 that are electrically connected are led out to the outside of the laminate film outer package 4, and the periphery of the laminate film outer package 4 is sealed or sealed in a rectangular bag shape by heat welding, for example. As a result, the airtightness of the battery 1 is secured.
  • the two upper and lower laminate films 4a and 4b forming the laminate film outer package 4 for example, a composite structure in which both front and back surfaces of an aluminum foil are covered with a heat-welding resin film is used.
  • both the lead terminals 2 and 3 are sometimes referred to as electrode tabs, and the positive lead terminal 2 is made of aluminum, for example, while the negative lead terminal 3 is Copper one is used.
  • Both lead terminals 2 and 3 are preliminarily subjected to a predetermined surface treatment, and are covered with a resin layer 7 (see FIG. 4) having heat welding properties and insulation properties.
  • FIG. 3 shows an enlarged cross-sectional view taken along line AA in FIG.
  • FIG. 4 shows an enlarged view of the portion corresponding to the lead terminal 2 on the positive electrode side in the left half of FIG. 5 and 6 are enlarged sectional views taken along lines AA and BB in FIG.
  • the thermal welding apparatus is mainly composed of a lower thermal welding jig 9 and an upper thermal welding jig 10 which are arranged to face each other so as to approach and separate from each other.
  • Both of the heat welding jigs 9 and 10 are made of, for example, stainless steel, and a portion that performs heat welding extends in the longitudinal direction of the heat welding portion 6 (see FIG. 1) of the laminate film exterior body 4 in a plan view.
  • the width dimension is set to be slightly larger than the width dimension of the heat-welded portion 6 of the laminate film outer package 4.
  • the upper and lower laminate films 4a and 4b to be the laminate film outer package 4 surrounding the laminate 5 in FIG. 2 are supported by a support member (not shown).
  • the lower thermal welding jig 9 and the upper thermal welding jig 10 are moved closer to each other, and the upper and lower laminate films 4a and 4b are pressure-restrained from above and below to apply the thermal welding to the corresponding part.
  • the laminate film exterior body 4 is finished.
  • the portion between the upper and lower laminate films 4 a and 4 b of the laminate film outer package 4 between the upper and lower laminate films 4 a and 4 b is directly welded. Since the positive lead terminal 2 is interposed and the laminate films 4a and 4b and the positive lead terminal 2 are thermally welded to each other, the thickness is inevitably different. Occurrence is inevitable. In order to cope with this step, the pressure restraining surfaces 9a and 10a, which are the contact surfaces with the laminate films 4a and 4b, of the upper and lower heat welding jigs 9 and 10 also have predetermined steps. .
  • the lower heat welding jig 9 includes a ribbon-shaped heater 13 along the longitudinal direction as an impulse-type heater through a glass tape 12 having electrical insulation and heat resistance on the upper surface of a stainless steel jig main body 11. It is pasted. Further, a heat-resistant fluororesin tape 14 is attached to the surface of the heater 13 to prevent the laminate film 4b from sticking. And the part corresponding to the lead terminal 2 on the positive electrode side of the pressure restraining surface 9a of the lower heat welding jig 9 which becomes the contact surface with the laminate film 4b at the time of heat welding corresponds to the step described above. Therefore, a concave portion 9b is formed.
  • a portion of the jig main body 11 of the lower heat welding jig 9 on the back side of the heater 13 and corresponding to the lead terminal 2 on the positive electrode side has a notch having a shape such as a concave shape. 9c is formed, and a heat insulating material 15 is fitted into the notch 9c. And the recessed part 9b used as a part of pressurization restraint surface 9a of the lower heat welding jig
  • tool 9 is formed in the upper surface of this heat insulating material 15. As shown in FIG.
  • the material of the heat insulating material 15 is a heat-resistant resin or rubber material.
  • the resin fully aromatic polyester, aromatic polyamide, poimide, polyethersulfone, polyamideimide, polybenzimidazole, polyether ether ketone (PEEK) are used.
  • the heat insulating material 15 is an elastic member having appropriate elasticity at the same time. Or the thing made from a fluororubber shall be used.
  • the upper thermal welding jig 10 is an inverted version of the lower thermal welding jig 9, and therefore the lower thermal welding jig 9 is the lower thermal welding jig 9.
  • the same reference numerals are given to the parts common to and the detailed description thereof will be omitted.
  • the ribbon-shaped heater 13 as the impulse-type heater described above is heated by instantaneously applying a low voltage / high current to generate heat and heating / melting the laminate films 4a and 4b as objects. Therefore, after the energization is completed, the pressure is maintained for a predetermined time and the cooling is performed.
  • the upper and lower heat welding jigs 9 and 10 are separated from each other, and the laminate 5 shown in FIG.
  • the two upper and lower laminate films 4a and 4b to be the surrounding laminate film outer package 4 are supported by a support member (not shown), and the parts to be thermally welded of these laminate films 4a and 4b are vertically heat welded jigs 9. , 10 to position.
  • the lower heat welding jig 9 and the upper heat welding jig 9 Together with the jig 10 the upper and lower laminate films 4 a and 4 b are pressed and restrained from above and below as shown in FIG. And in this pressurization restraint state, it impulse-energizes to each heater 13 and heat-welds.
  • the conventional so-called hot plate type heater requires about 13 seconds to complete the welding, whereas the impulse type heater 13 as described above completes the thermal welding in about 4 seconds.
  • the upper and lower two laminated films 4a and 4b are different from the part where the upper and lower laminated films 4a and 4b are directly heat-sealed. Since the lead terminal 2 is sandwiched between them, and the heat capacity of the lead terminal 2 itself is relatively large, part of the heat applied for heat welding escapes to the lead terminal 2 side, The temperature for welding at the site will be relatively low. On the other hand, except for the special feature that the heat capacity of the lead terminal 2 is large as described above, if attention is paid to the heat holding performance at the relevant part, each of the heaters 13 of the upper and lower heat welding jigs 9, 10.
  • the heat insulating material 15 is interposed on the back side and the portion corresponding to the lead terminal 2, for the heat insulating effect of the heat insulating material 15, in the heat welding portion in the portion corresponding to the lead terminal 2,
  • the heat transfer from each heater 13 to the jig body 11 side of the upper and lower heat welding jigs 9 and 10 can be suppressed, and the welding temperature can be kept relatively high.
  • the heat insulating material 15 is provided on the back side of the heater 13. Since it does not exist, a part of the heat escapes from the heater 13 to the jig body 11 side of the upper and lower heat welding jigs 9 and 10, and the temperature for welding at the part becomes relatively low. become.
  • the heat insulating material 15 makes it possible to maintain a high amount of heat at the portion, and as a result, the lead terminal
  • the welding temperature can be made substantially uniform between the portion corresponding to 2 and the portion not. Thereby, generation
  • the heat insulating material 15 is an elastic member such as silicone rubber or fluorine rubber having appropriate elasticity, it corresponds to the heat insulating material 15 among the pressure restraining surfaces 9a, 10a of the upper and lower heat welding jigs 9, 10.
  • the portion to be attached has good followability to the laminate films 4a and 4b between which the lead terminal 2 is sandwiched, and between the lead terminal 2 and the laminate films 4a and 4b or between the laminate films 4a and 4b and the upper and lower heat welding jigs 9,
  • the generation of a gap between the ten pressure restraint surfaces 9a and 10a can be suppressed, and more uniform heat welding can be performed. Therefore, this also improves the reliability of sealing or sealing treatment of the laminate film outer package 4.
  • FIG. 4 The description so far has been made based on FIG. 4 in which the portion corresponding to the lead terminal 2 on the positive electrode side in FIG. 3 is enlarged, but corresponds to the lead terminal 3 on the negative electrode side in FIG.
  • the structure and behavior of the part are basically the same as those in FIG.
  • the lead terminal 2 on the positive electrode side in FIG. 3 is made of aluminum, whereas the lead terminal 3 on the negative electrode side is made of copper. Then, copper (thermal conductivity: 386 W ⁇ m) used in the lead terminal 3 on the negative electrode side rather than aluminum (thermal conductivity: 237 W ⁇ m ⁇ 1 K ⁇ 1 ) used in the lead terminal 2 on the positive electrode side. -1 K -1 ) has a higher thermal conductivity.
  • the copper lead terminal 3 on the negative electrode side is larger than the thermal conductivity of the heat insulating material 15 corresponding to the aluminum lead terminal 2 on the positive electrode side. It is assumed that the thermal conductivity of the heat insulating material 15 corresponding to the above is set low in advance. Specifically, is the thickness dimension H in the vertical direction of the heat insulating material 15 in the portion corresponding to the negative lead terminal 3 larger than that of the heat insulating material 15 in the portion corresponding to the positive lead terminal 2? Alternatively, the material of the heat insulating material 15 corresponding to the negative lead terminal 3 is made to have a lower thermal conductivity than that of the heat insulating material 15 corresponding to the positive lead terminal 2.
  • the portions corresponding to the positive-side lead terminal 2 and the portion corresponding to the negative-side lead terminal 3 are simultaneously heat-welded by the common upper and lower heat-welding jigs 9 and 10, Since the copper used for the lead terminal 3 on the negative electrode side has higher thermal conductivity, the portion corresponding to the lead terminal 3 on the negative electrode side tends to have a lower welding temperature.
  • the negative electrode by increasing the thickness dimension of the heat insulating material 15 in the portion corresponding to the lead terminal 3 on the negative electrode side as described above or by making the thermal conductivity of the heat insulating material 15 low in advance, the negative electrode
  • the heat transfer from the portion corresponding to the lead terminal 3 on the side to the main body 11 side of the upper and lower heat welding jigs 9 and 10 can be made slow, resulting in the lead terminal 3 on the negative electrode side. It is possible to increase the welding temperature at the portion to be applied.
  • the impulse type heater 13 is used as an embodiment here, it is not limited as long as it is an apparatus that heat-welds four sides of the laminate film exterior body by heating.
  • the heat insulating material 15 should just have a heat conductivity lower than the stainless steel jig

Abstract

A lead terminal (2) on the positive electrode side and upper and lower laminated films (4a, 4b) that becomes a laminated film outer packaging body (4) are pressurized and constrained by upper and lower welding jigs (9, 10) and thermally welded by impulse heaters (13) of the respective welding jigs (9, 10). A heat insulating material (15) is provided in a portion located on the rear surface side of each of the heaters (13) and corresponding to the lead terminal (2), thereby preventing heat from escaping to the side of a jig main body (11) to keep the temperature of a thermal welding region in the portion corresponding to the lead terminal (2) relatively high. This makes it possible to make the welding temperature uniform at a side portion of the laminated films (4a, 4b), from which the lead terminal (2) is led out, and thereby prevent the occurrence of a thermal welding failure.

Description

ラミネート型二次電池の製造方法および製造装置Manufacturing method and manufacturing apparatus for laminate type secondary battery
　本発明は、ラミネート型または薄型と称される二次電池の製造方法と製造装置に関する。 The present invention relates to a method and apparatus for manufacturing a secondary battery called a laminate type or a thin type.
　リチウムイオン二次電池に代表されるようなラミネートパック型（薄型）の二次電池にあっては、電極である正極や負極および電解液を含む電池要素（発電要素）を外装体となるラミネートタイプの外装フィルムで包囲し、正極および負極の各集電体に電気的に接続されたリード端子を外装フィルムの外部に導出させた上で、外装フィルムの周縁部を熱溶着により例えば矩形袋状に封止または封口処理を施し、もって電池としての気密性を確保して、内部の電解液の漏れ出しを防ぐ構造となっている。なお、上記外装フィルムとしては、例えばアルミニウム箔の表裏両面を樹脂フィルムで被覆した構造のものが用いられる。 In a laminated pack type (thin type) secondary battery represented by a lithium ion secondary battery, a laminate type in which a battery element (power generation element) including a positive electrode, a negative electrode, and an electrolyte as electrodes is used as an exterior body. The lead terminals surrounded by the outer film and electrically connected to the current collectors of the positive electrode and the negative electrode are led out of the outer film, and the peripheral edge of the outer film is formed into, for example, a rectangular bag by heat welding. Sealing or sealing treatment is performed to ensure airtightness as a battery and prevent leakage of the electrolyte inside. In addition, as the said exterior film, the thing of the structure which coat | covered the front and back both surfaces of the aluminum foil with the resin film, for example is used.
　そして、外装フィルムに熱溶着を施す具体的手段としては、例えば特許文献１に記載されているように、伝熱ヒータが内蔵されていることで常時加熱されているいわゆる熱板方式の加圧治具を用い、外装フィルムの周縁部を上記加圧治具で表裏両面から挟み込んで熱溶着を施すようにしている。 As a specific means for performing heat welding on the exterior film, for example, as described in Patent Document 1, a so-called hot plate type pressure treatment that is always heated by incorporating a heat transfer heater is used. The outer peripheral film is sandwiched from both the front and back surfaces by the pressure jig, and heat welding is performed.
　上記のような二次電池の外装フィルムの熱溶着に際して、電極のリード端子が導出している辺部に着目した場合、電極のリード端子が導出している部分では外装フィルムとリード端子とが熱溶着することになるのに対して、それ以外の部分では外装フィルム同士が熱溶着することになり、両者で熱移動の挙動が異なるため、常に加熱されている加圧治具を押し付けただけではリード端子部分で熱溶着不良または封止不良が発生しやすい。これは、リード端子が導出している部分では、熱溶着のための熱がリード端子そのものに余分に移動してしまい、実際に溶着にあずかる部分の温度が低下してしまうことが原因と考えられる。 When heat-sealing the outer film of the secondary battery as described above, when focusing on the side portion where the lead terminal of the electrode is led out, the outer film and the lead terminal are heated in the portion where the lead terminal of the electrode is led out. While it will be welded, the exterior films will be thermally welded in other parts, and the behavior of heat transfer will be different between them, so just pressing the pressure jig that is always heated Thermal welding failure or sealing failure is likely to occur at the lead terminal portion. This is considered to be caused by the fact that the heat for heat welding is excessively transferred to the lead terminal itself in the portion where the lead terminal is led out, and the temperature of the portion actually involved in the welding is lowered. .
特開２００１－７６６９０号公報JP 2001-76690 A
　本発明はこのような課題に着目してなされたものであり、とりわけ外装フィルムのうちリード端子が導出している辺部に熱溶着を施すに際して、溶着温度を均一化することで熱溶着不良の発生を抑制しようとするものである。 The present invention has been made paying attention to such a problem, and in particular, when performing thermal welding on the side portion of the exterior film from which the lead terminal is led out, by making the welding temperature uniform, it is possible to prevent thermal welding failure. It is intended to suppress the occurrence.
　そこで、本発明では、外装フィルムとの接触面側にのヒータを備えた熱溶着治具により外装フィルムの周縁部を加圧拘束して熱溶着を施すにあたり、電極の端子部に対応する部分では、熱溶着治具の治具本体とヒータとの間に断熱材を介装した状態で熱溶着を施すようにしたものである。 Therefore, in the present invention, in applying heat welding by pressing and restraining the peripheral portion of the exterior film with a heat welding jig provided with a heater on the contact surface side with the exterior film, in the portion corresponding to the terminal portion of the electrode, The heat welding is performed with a heat insulating material interposed between the jig body of the heat welding jig and the heater.
　本発明によれば、断熱材による断熱効果によって、電極の端子部が導出している部分とそうでない部分とで溶着温度を均一化することができ、熱溶着不良の発生を抑制して、二次電池の外装フィルムについて信頼性の高い封止または封口処理を行うことができる。 According to the present invention, due to the heat insulating effect of the heat insulating material, the welding temperature can be made uniform between the portion where the terminal portion of the electrode is led out and the portion where the electrode terminal portion is not, and the occurrence of poor heat welding can be suppressed. A highly reliable sealing or sealing process can be performed on the exterior film of the secondary battery.
本発明の実施に適用されるラミネート型リチウムイオン二次電池の概略構造を示す斜視図。1 is a perspective view showing a schematic structure of a laminated lithium ion secondary battery applied to the practice of the present invention. 図１に示したラミネート型リチウムイオン二次電池の分解斜視図。FIG. 2 is an exploded perspective view of the laminated lithium ion secondary battery shown in FIG. 1. 本発明に係るラミネート型二次電池の製造装置の実施の形態として熱溶着装置を示す図で、図１のＡ－Ａ線に沿った拡大断面説明図。FIG. 2 is a diagram showing a heat welding apparatus as an embodiment of a manufacturing apparatus for a laminate type secondary battery according to the present invention, and is an enlarged cross-sectional explanatory view taken along line AA of FIG. 図３の左半部を拡大した図で、（Ａ）は上下の熱溶着治具が離間している状態を示す断面図、（Ｂ）は上下の熱溶着治具が接近してラミネートフィルムを加圧拘束した状態を示す断面図。It is the figure which expanded the left half part of FIG. 3, (A) is sectional drawing which shows the state from which the upper and lower heat welding jigs have separated, (B) is the upper and lower heat welding jigs approaching, and laminated film Sectional drawing which shows the state restrained by pressure. 図４の（Ｂ）のＢ－Ｂ線に沿った拡大断面図。FIG. 5 is an enlarged cross-sectional view taken along line BB in FIG. 図４の（Ｂ）のＣ－Ｃ線に沿った拡大断面図。FIG. 5 is an enlarged sectional view taken along the line CC in FIG.
　図１～６は本発明に係るラミネート型二次電池の製造方法を実施するためのより具体的な形態を示し、特に図１はラミネート型二次電池の一例としてリチウムイオン二次電池（以下、単に「電池」という。）の概略構造を、図２はその分解斜視図をそれぞれ示している。この電池は、例えば電気自動車用のリチウムイオンバッテリの単位セルまたは単電池として用いられる。 1 to 6 show a more specific form for carrying out the method for manufacturing a laminate type secondary battery according to the present invention. In particular, FIG. 1 shows a lithium ion secondary battery (hereinafter, referred to as a laminate type secondary battery). FIG. 2 shows an exploded perspective view of the schematic structure of the battery. This battery is used, for example, as a unit cell or a single battery of a lithium ion battery for an electric vehicle.
　図１，２に示すように、電池１は、正極側の電極端子としてのリード端子（正極端子部）２と負極側の電極端子としてのリード端子（負極端子部）３とが外部に導出された状態で外装フィルムとしての上下二枚のラミネートフィルム４ａ，４ｂからなる矩形状のラミネートフィルム外装体４にて収納密閉されている。ラミネートフィルム外装体４の内部には、電池要素（発電要素）である電極としての正極と負極およびそれら両者の間に介在するセパレータとを複数組積層してなる積層体５が電解液とともに収容されていて、ラミネートフィルム外装体４の四周が熱溶着により気密に封止または封口処理が施されている。なお、四周の熱溶着部を符号６で示す。 As shown in FIGS. 1 and 2, in the battery 1, a lead terminal (positive electrode terminal portion) 2 as a positive electrode terminal and a lead terminal (negative electrode portion) 3 as a negative electrode terminal are led out to the outside. In this state, the film is housed and sealed by a rectangular laminated film outer package 4 composed of two upper and lower laminated films 4a and 4b as an outer film. Inside the laminate film outer package 4 is accommodated together with an electrolyte a laminate 5 formed by laminating a plurality of sets of positive and negative electrodes as electrodes that are battery elements (power generation elements) and separators interposed therebetween. In addition, the four circumferences of the laminate film outer package 4 are hermetically sealed or sealed by heat welding. The four-round heat welded portion is denoted by reference numeral 6.
　すなわち、図１，２に示した電池１にあっては、電極である正極や負極、セパレータおよび電解液を含む電池要素をラミネートフィルム外装体４で包囲し、正極および負極の各集電体に電気的に接続されたそれぞれのリード端子２，３をラミネートフィルム外装体４の外部に導出させた上で、ラミネートフィルム外装体４の周縁部を熱溶着により例えば矩形袋状に封止または封口処理を施すことで、電池１としての気密性を確保してある。なお、ラミネートフィルム外装体４を形成している上下二枚のラミネートフィルム４ａ，４ｂとしては、例えばアルミニウム箔の表裏両面を熱溶着性樹脂フィルムで被覆した複合構造のものが使用される。 That is, in the battery 1 shown in FIGS. 1 and 2, a battery element including a positive electrode and a negative electrode as electrodes, a separator, and an electrolyte solution is surrounded by a laminate film outer package 4, and each positive electrode and negative electrode current collector is enclosed. The lead terminals 2 and 3 that are electrically connected are led out to the outside of the laminate film outer package 4, and the periphery of the laminate film outer package 4 is sealed or sealed in a rectangular bag shape by heat welding, for example. As a result, the airtightness of the battery 1 is secured. As the two upper and lower laminate films 4a and 4b forming the laminate film outer package 4, for example, a composite structure in which both front and back surfaces of an aluminum foil are covered with a heat-welding resin film is used.
　そして、矩形状のラミネートフィルム外装体４のうち共通の一辺部から正極側のリード端子２と負極側のリード端子３とが共に外部に導出されている。この場合において、双方のリード端子２，３は電極タブと称されることがあるほか、正極側のリード端子２としては例えばアルミニウム製のものが使用され、他方、負極側のリード端子３としては銅製のものが使用される。また、双方のリード端子２，３は予め所定の表面処理が施された上で、熱溶着性および絶縁性のある樹脂層７（図４参照）で被覆されている。 And, the lead terminal 2 on the positive electrode side and the lead terminal 3 on the negative electrode side are both led out from one common side of the rectangular laminated film outer package 4. In this case, both the lead terminals 2 and 3 are sometimes referred to as electrode tabs, and the positive lead terminal 2 is made of aluminum, for example, while the negative lead terminal 3 is Copper one is used. Both lead terminals 2 and 3 are preliminarily subjected to a predetermined surface treatment, and are covered with a resin layer 7 (see FIG. 4) having heat welding properties and insulation properties.
　矩形状のラミネートフィルム外装体４における四辺部の熱溶着は熱溶着装置により例えば数工程に分けて行われ、熱溶着時における図１のＡ－Ａ線に沿う拡大断面図を図３に示していて、図３における左半部の正極側のリード端子２相当部を拡大したものを図４に示している。また、図４のＡ－Ａ線およびＢ－Ｂ線に沿ったそれぞれの拡大断面図を図５，６に示している。 The four sides of the rectangular laminate film outer package 4 are welded by, for example, several processes using a heat welding apparatus. FIG. 3 shows an enlarged cross-sectional view taken along line AA in FIG. FIG. 4 shows an enlarged view of the portion corresponding to the lead terminal 2 on the positive electrode side in the left half of FIG. 5 and 6 are enlarged sectional views taken along lines AA and BB in FIG.
　図５，６から明らかなように、図２の積層体５の一部を形成している複数枚の正極８の延長部同士を重ね合わせた上で、当該重合部８ａを正極７側のリード端子２に溶接にて接続してある。なお、この構造は負極とその負極側のリード端子３との関係についても基本的に同様であり、これらの構造は図２では図示省略している。 As is apparent from FIGS. 5 and 6, the overlapping portions of the plurality of positive electrodes 8 forming a part of the laminate 5 in FIG. It is connected to the terminal 2 by welding. This structure is basically the same for the relationship between the negative electrode and the lead terminal 3 on the negative electrode side, and these structures are not shown in FIG.
　図４に示すように、熱溶着装置は、互いに接近離間可能に対向配置された下側の熱溶着治具９と上側の熱溶着治具１０とを主要素として構成されている。双方の熱溶着治具９，１０は例えばステンレス製のものであり、熱溶着を司る部分が平面視ではラミネートフィルム外装体４の熱溶着部６（図１参照）の長手方向に延び、且つ図５，６に示すように幅寸法がラミネートフィルム外装体４の熱溶着部６の幅寸法よりもわずかに大きい寸法に設定されている。 As shown in FIG. 4, the thermal welding apparatus is mainly composed of a lower thermal welding jig 9 and an upper thermal welding jig 10 which are arranged to face each other so as to approach and separate from each other. Both of the heat welding jigs 9 and 10 are made of, for example, stainless steel, and a portion that performs heat welding extends in the longitudinal direction of the heat welding portion 6 (see FIG. 1) of the laminate film exterior body 4 in a plan view. As shown in FIGS. 5 and 6, the width dimension is set to be slightly larger than the width dimension of the heat-welded portion 6 of the laminate film outer package 4.
　そして、図２の積層体５を包囲するラミネートフィルム外装体４となるべき上下二枚のラミネートフィルム４ａ，４ｂを図示外の支持部材で支えた状態で、図４の（Ｂ）に示すように、下側の熱溶着治具９と上側の熱溶着治具１０とを接近動作させて、上下二枚のラミネートフィルム４ａ，４ｂを上下から加圧拘束することで該当部位に熱溶着を施し、もってラミネートフィルム外装体４として仕上げられることになる。 As shown in FIG. 4B, the upper and lower laminate films 4a and 4b to be the laminate film outer package 4 surrounding the laminate 5 in FIG. 2 are supported by a support member (not shown). The lower thermal welding jig 9 and the upper thermal welding jig 10 are moved closer to each other, and the upper and lower laminate films 4a and 4b are pressure-restrained from above and below to apply the thermal welding to the corresponding part. Thus, the laminate film exterior body 4 is finished.
　ここで、図４から明らかなように、ラミネートフィルム外装体４のうち上下二枚のラミネートフィルム４ａ，４ｂ同士が直接熱溶着される部分と、上下二枚のラミネートフィルム４ａ，４ｂ同士の間に正極側のリード端子２が介在していてそれらのラミネートフィルム４ａ，４ｂと正極側のリード端子２とが熱溶着される部分とでは、必然的に厚みが異なるため、両者の境界部分では段差の発生が不可避となる。この段差に対応するために、上下双方の熱溶着治具９，１０のうちラミネートフィルム４ａ，４ｂとの接触面となる加圧拘束面９ａ，１０ａも所定の段差を有したものとなっている。 Here, as is apparent from FIG. 4, the portion between the upper and lower laminate films 4 a and 4 b of the laminate film outer package 4 between the upper and lower laminate films 4 a and 4 b is directly welded. Since the positive lead terminal 2 is interposed and the laminate films 4a and 4b and the positive lead terminal 2 are thermally welded to each other, the thickness is inevitably different. Occurrence is inevitable. In order to cope with this step, the pressure restraining surfaces 9a and 10a, which are the contact surfaces with the laminate films 4a and 4b, of the upper and lower heat welding jigs 9 and 10 also have predetermined steps. .
　下側の熱溶着治具９は、ステンレス製の治具本体１１の上面に電気絶縁性および耐熱性のあるガラステープ１２を介してインパルス式のヒータとしてリボン状のヒータ１３を長手方向に沿って貼り付けたものである。さらに、ヒータ１３の表面にはラミネートフィルム４ｂの貼り付き防止のために耐熱性のあるフッ素樹脂製のテープ１４を貼り付けてある。そして、熱溶着時にラミネートフィルム４ｂとの接触面となる下側の熱溶着治具９の加圧拘束面９ａのうち正極側のリード端子２に対応する部分では、先に述べた段差に対応するために凹状部９ｂを形成してある。 The lower heat welding jig 9 includes a ribbon-shaped heater 13 along the longitudinal direction as an impulse-type heater through a glass tape 12 having electrical insulation and heat resistance on the upper surface of a stainless steel jig main body 11. It is pasted. Further, a heat-resistant fluororesin tape 14 is attached to the surface of the heater 13 to prevent the laminate film 4b from sticking. And the part corresponding to the lead terminal 2 on the positive electrode side of the pressure restraining surface 9a of the lower heat welding jig 9 which becomes the contact surface with the laminate film 4b at the time of heat welding corresponds to the step described above. Therefore, a concave portion 9b is formed.
　より詳しくは、下側の熱溶着治具９の治具本体１１のうちヒータ１３の背面側であって且つ正極側のリード端子２に対応する部分には、凹状に切除した如き形状の切欠部９ｃを形成してあり、この切欠部９ｃに断熱材１５を嵌合させてある。そして、この断熱材１５の上面に下側の熱溶着治具９の加圧拘束面９ａの一部となる凹状部９ｂを形成してある。断熱材１５の材質としては耐熱性のある樹脂またはゴム材料とする。樹脂として、全芳香ポリエステル、芳香族ポリアミド、ポイミド、ポリエーテルサルフォン、ポリアミドイミド、ポリベンゾイミダゾール、ポリエーテル・エーテルケトン（ＰＥＥＫ）を用いるものとする。特にラミネートフィルム４ａ，４ｂに挟まれたリード端子２に対する形状追従性の面では、断熱材１５が同時に適度な弾性を有した弾性部材であることが望ましく、この場合には断熱材１５としてシリコーンゴムあるいはフッ素ゴム製のものを用いるものとする。 More specifically, a portion of the jig main body 11 of the lower heat welding jig 9 on the back side of the heater 13 and corresponding to the lead terminal 2 on the positive electrode side has a notch having a shape such as a concave shape. 9c is formed, and a heat insulating material 15 is fitted into the notch 9c. And the recessed part 9b used as a part of pressurization restraint surface 9a of the lower heat welding jig | tool 9 is formed in the upper surface of this heat insulating material 15. As shown in FIG. The material of the heat insulating material 15 is a heat-resistant resin or rubber material. As the resin, fully aromatic polyester, aromatic polyamide, poimide, polyethersulfone, polyamideimide, polybenzimidazole, polyether ether ketone (PEEK) are used. In particular, in terms of shape followability with respect to the lead terminal 2 sandwiched between the laminate films 4a and 4b, it is desirable that the heat insulating material 15 is an elastic member having appropriate elasticity at the same time. Or the thing made from a fluororubber shall be used.
　ここで、上側の熱溶着治具１０は下側の熱溶着治具９の上下を反転させたものと理解することができるから、上側の熱溶着治具１０について下側の熱溶着治具９と共通する部分には同一符号を付して、その詳細な説明は省略するものとする。 Here, it can be understood that the upper thermal welding jig 10 is an inverted version of the lower thermal welding jig 9, and therefore the lower thermal welding jig 9 is the lower thermal welding jig 9. The same reference numerals are given to the parts common to and the detailed description thereof will be omitted.
　また、先に述べたインパルス式のヒータとしてのリボン状のヒータ１３は、瞬間的に低電圧・高電流を流して発熱させ、対象物であるラミネートフィルム４ａ，４ｂを加熱・溶融させることで溶着するものであり、通電完了後も所定時間だけ加圧状態のままとして冷却させることになる。 Also, the ribbon-shaped heater 13 as the impulse-type heater described above is heated by instantaneously applying a low voltage / high current to generate heat and heating / melting the laminate films 4a and 4b as objects. Therefore, after the energization is completed, the pressure is maintained for a predetermined time and the cooling is performed.
　したがって、このように構成された熱溶着装置では、図４の（Ａ）に示すように、上下の熱溶着治具９，１０が相互に離間している状態で、図２の積層体５を包囲するラミネートフィルム外装体４となるべき上下二枚のラミネートフィルム４ａ，４ｂを図示外の支持部材で支えて、これらのラミネートフィルム４ａ，４ｂのうち熱溶着対象部位を上下の熱溶着治具９，１０に対して位置決めする。 Therefore, in the heat welding apparatus configured as described above, as shown in FIG. 4A, the upper and lower heat welding jigs 9 and 10 are separated from each other, and the laminate 5 shown in FIG. The two upper and lower laminate films 4a and 4b to be the surrounding laminate film outer package 4 are supported by a support member (not shown), and the parts to be thermally welded of these laminate films 4a and 4b are vertically heat welded jigs 9. , 10 to position.
　ラミネートフィルム外装体４となるべき上下二枚のラミネートフィルム４ａ，４ｂと上下の熱溶着治具９，１０との相対位置決めがなされたならば、下側の熱溶着治具９と上側の熱溶着治具１０とを共に接近動作させて、図４の（Ｂ）に示すように上下二枚のラミネートフィルム４ａ，４ｂを上下から加圧拘束する。そして、この加圧拘束状態のままでそれぞれのヒータ１３にインパルス通電して熱溶着を施す。なお、従来のいわゆる熱板方式のヒータでは溶着完了までに１３秒程度を要するのに対して、上記のようなインパルス方式のヒータ１３では４秒程度で熱溶着が完了する。 If the relative positioning between the upper and lower laminate films 4a and 4b and the upper and lower heat welding jigs 9 and 10 to be the laminate film outer package 4 is made, the lower heat welding jig 9 and the upper heat welding jig 9 Together with the jig 10, the upper and lower laminate films 4 a and 4 b are pressed and restrained from above and below as shown in FIG. And in this pressurization restraint state, it impulse-energizes to each heater 13 and heat-welds. The conventional so-called hot plate type heater requires about 13 seconds to complete the welding, whereas the impulse type heater 13 as described above completes the thermal welding in about 4 seconds.
　この場合において、図４の（Ｂ）のリード端子２に対応する部分では、上下二枚のラミネートフィルム４ａ，４ｂ同士が直接熱溶着される部分とは異なり、上下二枚のラミネートフィルム４ａ，４ｂ同士の間にリード端子２が挾まれていて、リード端子２自体の熱容量が相対的に大きいことから、熱溶着のために投与された熱の一部がリード端子２側に逃げてしまい、当該部位での溶着のための温度が相対的に低くなってしまうことになる。その一方で、上記のようなリード端子２の熱容量が大きいという特殊性を除き、当該部位での熱の保有性能に着目すれば、上下の熱溶着治具９，１０のうちそれぞれのヒータ１３の背面側であって且つリード端子２に相当する部分に断熱材１５を介在させてあることで、その断熱材１５の断熱効果のために、リード端子２に相当する部分での熱溶着部位では、各ヒータ１３から上下の熱溶着治具９，１０の治具本体１１側への熱の移動を抑制して、相対的に溶着温度を高く維持することができる。 In this case, in the part corresponding to the lead terminal 2 in FIG. 4B, the upper and lower two laminated films 4a and 4b are different from the part where the upper and lower laminated films 4a and 4b are directly heat-sealed. Since the lead terminal 2 is sandwiched between them, and the heat capacity of the lead terminal 2 itself is relatively large, part of the heat applied for heat welding escapes to the lead terminal 2 side, The temperature for welding at the site will be relatively low. On the other hand, except for the special feature that the heat capacity of the lead terminal 2 is large as described above, if attention is paid to the heat holding performance at the relevant part, each of the heaters 13 of the upper and lower heat welding jigs 9, 10. Because the heat insulating material 15 is interposed on the back side and the portion corresponding to the lead terminal 2, for the heat insulating effect of the heat insulating material 15, in the heat welding portion in the portion corresponding to the lead terminal 2, The heat transfer from each heater 13 to the jig body 11 side of the upper and lower heat welding jigs 9 and 10 can be suppressed, and the welding temperature can be kept relatively high.
　そして、図４の（Ｂ）のリード端子２に対応する部分以外の部分、すなわち上下二枚のラミネートフィルム４ａ，４ｂ同士が直接熱溶着される部分では、ヒータ１３の背面側に断熱材１５が存在しないため、ヒータ１３から上下の熱溶着治具９，１０の治具本体１１側へ熱の一部が逃げてしまい、当該部位での溶着のための温度が相対的に低くなってしまうことになる。 Then, in a portion other than the portion corresponding to the lead terminal 2 in FIG. 4B, that is, in a portion where the two upper and lower laminate films 4 a and 4 b are directly heat welded, the heat insulating material 15 is provided on the back side of the heater 13. Since it does not exist, a part of the heat escapes from the heater 13 to the jig body 11 side of the upper and lower heat welding jigs 9 and 10, and the temperature for welding at the part becomes relatively low. become.
　このことは、図４の（Ｂ）において、リード端子２に対応する部分において当該リード端子２側に逃げてしまう熱量と、リード端子２が介在することなく上下二枚のラミネートフィルム４ａ，４ｂ同士が直接熱溶着される部分から上下の熱溶着治具９，１０の治具本体１１側へ逃げてしまう熱量とがほぼ相殺されてしまうか、あるいはリード端子２に対応する部分において当該リード端子２側に逃げてしまう熱量の方が小さいことを意味する。 This is because, in FIG. 4B, the amount of heat that escapes to the lead terminal 2 side at the portion corresponding to the lead terminal 2, and the two upper and lower laminate films 4a and 4b without the lead terminal 2 interposed therebetween. The amount of heat that escapes to the jig body 11 side of the upper and lower heat welding jigs 9 and 10 from the part where the heat welding is directly welded is almost offset or the lead terminal 2 in the part corresponding to the lead terminal 2. It means that the amount of heat that escapes to the side is smaller.
　そのため、リード端子２に対応する部分において当該リード端子２側に逃げてしまう熱量があっても、断熱材１５があることによって、当該部位での熱量を高く維持することができ、結果としてリード端子２に対応する部分とそうでない部分とで溶着温度をほぼ均一化することができる。これにより、リード端子２に対応する部分での熱溶着不良の発生を抑制して、ラミネートフィルム外装体４の封止または封口処理の信頼性が向上することになる。 Therefore, even if there is an amount of heat that escapes to the lead terminal 2 side in a portion corresponding to the lead terminal 2, the heat insulating material 15 makes it possible to maintain a high amount of heat at the portion, and as a result, the lead terminal The welding temperature can be made substantially uniform between the portion corresponding to 2 and the portion not. Thereby, generation | occurrence | production of the heat-welding defect in the part corresponding to the lead terminal 2 is suppressed, and the reliability of the sealing or sealing process of the laminate film exterior body 4 improves.
　加えて、断熱材１５が適度な弾性を有したシリコーンゴムあるいはフッ素ゴム等の弾性部材であるため、上下の熱溶着治具９，１０の加圧拘束面９ａ，１０ａのうち断熱材１５に相当する部分はリード端子２が挟まれたラミネートフィルム４ａ，４ｂへの追従性が良く、リード端子２とラミネートフィルム４ａ，４ｂとの間、あるいはラミネートフィルム４ａ，４ｂと上下の熱溶着治具９，１０の加圧拘束面９ａ，１０ａの間での隙間の発生を抑制して、より均一な熱溶着を施すことができる。そのため、これによってもまた、ラミネートフィルム外装体４の封止または封口処理の信頼性が向上することになる。 In addition, since the heat insulating material 15 is an elastic member such as silicone rubber or fluorine rubber having appropriate elasticity, it corresponds to the heat insulating material 15 among the pressure restraining surfaces 9a, 10a of the upper and lower heat welding jigs 9, 10. The portion to be attached has good followability to the laminate films 4a and 4b between which the lead terminal 2 is sandwiched, and between the lead terminal 2 and the laminate films 4a and 4b or between the laminate films 4a and 4b and the upper and lower heat welding jigs 9, The generation of a gap between the ten pressure restraint surfaces 9a and 10a can be suppressed, and more uniform heat welding can be performed. Therefore, this also improves the reliability of sealing or sealing treatment of the laminate film outer package 4.
　なお、ここまでは、図３の正極側のリード端子２相当部を拡大した図４に基づいて説明したが、正極側のリード端子２に近接している図３の負極側のリード端子３相当部においても、その構造および挙動は図４のものと基本的に同様である。 The description so far has been made based on FIG. 4 in which the portion corresponding to the lead terminal 2 on the positive electrode side in FIG. 3 is enlarged, but corresponds to the lead terminal 3 on the negative electrode side in FIG. The structure and behavior of the part are basically the same as those in FIG.
　その一方、図３の正極側のリード端子２がアルミニウム製のものであるのに対して、負極側のリード端子３は銅製のものである。そして、正極側のリード端子２に使われているアルミニウム（熱伝導率：２３７Ｗ・ｍ-1Ｋ-1）よりも負極側のリード端子３に使われている銅（熱伝導率：３８６Ｗ・ｍ-1Ｋ-1）の方が熱伝導率が高いという特性がある。 On the other hand, the lead terminal 2 on the positive electrode side in FIG. 3 is made of aluminum, whereas the lead terminal 3 on the negative electrode side is made of copper. Then, copper (thermal conductivity: 386 W · m) used in the lead terminal 3 on the negative electrode side rather than aluminum (thermal conductivity: 237 W · m −1 K −1 ) used in the lead terminal 2 on the positive electrode side. -1 K -1 ) has a higher thermal conductivity.
　そこで、双方のリード端子２，３同士の材質の違いを考慮し、正極側のアルミニウム製のリード端子２に相当する部分の断熱材１５の熱伝導率よりも、負極側の銅製のリード端子３に相当する部分の断熱材１５の熱伝導率を予め低く設定しておくものとする。具体的には、負極側のリード端子３に相当する部分の断熱材１５の上下方向での厚み寸法Ｈを、正極側のリード端子２に相当する部分の断熱材１５のそれよりも大きくするか、あるいは負極側のリード端子３に相当する部分の断熱材１５の材質を、正極側のリード端子２に相当する部分の断熱材１５のそれよりも熱伝導率の低いものとしておく。 Therefore, considering the difference in material between the lead terminals 2 and 3, the copper lead terminal 3 on the negative electrode side is larger than the thermal conductivity of the heat insulating material 15 corresponding to the aluminum lead terminal 2 on the positive electrode side. It is assumed that the thermal conductivity of the heat insulating material 15 corresponding to the above is set low in advance. Specifically, is the thickness dimension H in the vertical direction of the heat insulating material 15 in the portion corresponding to the negative lead terminal 3 larger than that of the heat insulating material 15 in the portion corresponding to the positive lead terminal 2? Alternatively, the material of the heat insulating material 15 corresponding to the negative lead terminal 3 is made to have a lower thermal conductivity than that of the heat insulating material 15 corresponding to the positive lead terminal 2.
　したがって、正極側のリード端子２に相当する部分と負極側のリード端子３に相当する部分とに対して、共通の上下の熱溶着治具９，１０にて同時に熱溶着を施した場合に、負極側のリード端子３に使われている銅の方が熱伝導率が高いので、負極側のリード端子３に相当する部分の方が溶着温度が低くなる傾向にある。その一方で、上記のように負極側のリード端子３に相当する部分の断熱材１５の厚み寸法を予め大きくしたり、あるいはその断熱材１５の熱伝導率を予め低いものとしておくことにより、負極側のリード端子３に相当する部分から上下の熱溶着治具９，１０の本体部１１側への熱の移動を緩慢なものとすることができて、結果として負極側のリード端子３に相当する部分での溶着温度を高くすることができる。 Accordingly, when the portions corresponding to the positive-side lead terminal 2 and the portion corresponding to the negative-side lead terminal 3 are simultaneously heat-welded by the common upper and lower heat- welding jigs 9 and 10, Since the copper used for the lead terminal 3 on the negative electrode side has higher thermal conductivity, the portion corresponding to the lead terminal 3 on the negative electrode side tends to have a lower welding temperature. On the other hand, by increasing the thickness dimension of the heat insulating material 15 in the portion corresponding to the lead terminal 3 on the negative electrode side as described above or by making the thermal conductivity of the heat insulating material 15 low in advance, the negative electrode The heat transfer from the portion corresponding to the lead terminal 3 on the side to the main body 11 side of the upper and lower heat welding jigs 9 and 10 can be made slow, resulting in the lead terminal 3 on the negative electrode side. It is possible to increase the welding temperature at the portion to be applied.
　なお、ここでは、インパルス式のヒータ１３を実施の形態として使用しているが、ラミネートフィルム外装体における四辺部を加熱により熱溶着する装置であれば、その限りではない。また、断熱材１５はステンレス製の治具本体よりも熱伝導率が低いものであればよい。 In addition, although the impulse type heater 13 is used as an embodiment here, it is not limited as long as it is an apparatus that heat-welds four sides of the laminate film exterior body by heating. Moreover, the heat insulating material 15 should just have a heat conductivity lower than the stainless steel jig | tool main body.

Claims (6)

  1. 　電極を含む電池要素を外装フィルムに収納し、電極の端子部を外装フィルムの外部に導出させた上で外装フィルムの周縁部を熱溶着により封止するようにしたラミネート型二次電池の製造方法において、
    　上記外装フィルムとの接触面側にヒータを備えた熱溶着治具により外装フィルムの周縁部を加圧拘束して熱溶着処理を施すにあたり、
    　上記電極の端子部に対応する部分では、熱溶着治具の治具本体とヒータとの間に断熱材を介装した状態で熱溶着処理を施すようにしたラミネート型二次電池の製造方法。     A method for manufacturing a laminate type secondary battery in which a battery element including an electrode is housed in an exterior film, and a terminal portion of the electrode is led out of the exterior film, and a peripheral portion of the exterior film is sealed by thermal welding. In
    In performing heat welding treatment by pressurizing and restraining the peripheral portion of the outer film with a heat welding jig equipped with a heater on the contact surface side with the outer film,
    A method for manufacturing a laminate type secondary battery, wherein a portion corresponding to the terminal portion of the electrode is subjected to a heat welding process with a heat insulating material interposed between a jig body of a heat welding jig and a heater.
  2. 　上記断熱材が弾性部材である請求項１に記載のラミネート型二次電池の製造方法。 The method for manufacturing a laminated secondary battery according to claim 1, wherein the heat insulating material is an elastic member.
  3. 　上記電極として正極と負極を有していて、正極の端子部に対応する部分の断熱材よりも負極の端子部に対応する部分の断熱材の方が熱伝導率が低いものとなっている請求項２に記載のラミネート型二次電池の製造方法。 The electrode has a positive electrode and a negative electrode, and the heat insulating material corresponding to the terminal portion of the negative electrode has a lower thermal conductivity than the heat insulating material corresponding to the terminal portion of the positive electrode. Item 3. A method for producing a laminate type secondary battery according to Item 2.
  4. 　電極を含む電池要素を外装フィルムに収納し、電極の端子部を外装フィルムの外部に導出させた上で外装フィルムの周縁部を熱溶着により封止するようにしたラミネート型二次電池の製造装置において、
    　上記外装フィルムとの接触面側にヒータを備えた熱溶着治具により外装フィルムの周縁部を加圧拘束して熱溶着処理を施すようになっていて、
    　上記電極の端子部に対応する部分では、熱溶着治具の治具本体とヒータとの間に断熱材を介装してあるラミネート型二次電池の製造装置。     An apparatus for manufacturing a laminate type secondary battery in which a battery element including an electrode is housed in an exterior film, a terminal portion of the electrode is led out of the exterior film, and a peripheral portion of the exterior film is sealed by thermal welding. In
    The outer peripheral film is subjected to thermal welding treatment by pressurizing and restraining the peripheral portion of the outer film with a heat welding jig provided with a heater on the contact surface side with the outer film,
    An apparatus for manufacturing a laminated secondary battery, wherein a heat insulating material is interposed between a jig body of a heat welding jig and a heater at a portion corresponding to the terminal portion of the electrode.
  5. 　上記断熱材が弾性部材である請求項４に記載のラミネート型二次電池の製造装置。 The apparatus for manufacturing a laminated secondary battery according to claim 4, wherein the heat insulating material is an elastic member.
  6. 　上記電極として正極と負極を有していて、正極の端子部に対応する部分の断熱材よりも負極の端子部に対応する部分の断熱材の方が熱伝導率が低いものである請求項５に記載のラミネート型二次電池の製造装置。 6. The electrode has a positive electrode and a negative electrode, and the heat insulating material corresponding to the terminal portion of the negative electrode has a lower thermal conductivity than the heat insulating material corresponding to the terminal portion of the positive electrode. An apparatus for producing a laminated secondary battery according to 1.
PCT/JP2014/058176 2013-05-23 2014-03-25 Laminated-type secondary battery manufacturing method and manufacturing device WO2014188774A1 (en)

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