JP2005056655A - Flat type secondary battery and battery pack - Google Patents

Flat type secondary battery and battery pack Download PDF

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JP2005056655A
JP2005056655A JP2003285346A JP2003285346A JP2005056655A JP 2005056655 A JP2005056655 A JP 2005056655A JP 2003285346 A JP2003285346 A JP 2003285346A JP 2003285346 A JP2003285346 A JP 2003285346A JP 2005056655 A JP2005056655 A JP 2005056655A
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heat
secondary battery
flat
element body
laminate film
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JP4553100B2 (en
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Chika Kanbe
千夏 神部
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NEC Lamilion Energy Ltd
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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
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    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To increase radiation efficiency of a flat type secondary battery and a battery pack. <P>SOLUTION: This flat type laminated film secondary battery has a heat radiation plate 4 made of metal to discharge the heat generated internally by power generating element body 8 outside. The radiation plate 4 is in contact with two sheets of adjacent separators 7 constituting the power generating element body 8 and pinched enabling heat transfer, and installed so that extensions 4a, 4b extend from the side where a positive electrode terminal and a negative electrode terminal of the laminated film do not extend. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、ラミネートフィルムを外装体とする扁平型二次電池および組電池に関し、特に放熱用部材を備えた扁平型二次電池および組電池に関するものである。   The present invention relates to a flat secondary battery and an assembled battery having a laminate film as an outer package, and more particularly to a flat secondary battery and an assembled battery provided with a heat dissipation member.

近年、二次電池を用いた中・大容量バッテリの需要が高まってきている。特に電動自転車を始め電動バイク、電気自動車への用途が高まっており電力的には１００Ｗ〜１０００Ｗの中電力バッテリや１０００Ｗ以上の大電力バッテリが注目を集めている。   In recent years, demand for medium and large capacity batteries using secondary batteries has increased. In particular, applications for electric bicycles, electric motorcycles, and electric vehicles are increasing, and in terms of power, medium power batteries of 100 W to 1000 W and high power batteries of 1000 W or more are attracting attention.

従来は鉛電池やニッケル水素電池を大量に組み合わせた高価で重量密度及び体積密度の低い大型のバッテリが主流であった。しかしながら大電力バッテリの需要が伸びるとともに安価で重量密度及び体積密度の高い、小型で大電力を放電することができるバッテリが望まれてきている。一方、素電池（電池セル）としては高電位タイプのリチウムイオン二次電池が登場し、軽量なラミネートフィルムを外装体とする二次電池が主流になってきている。   Conventionally, high-priced large batteries with a low weight density and volume density, which are a large number of combinations of lead batteries and nickel metal hydride batteries, have been mainstream. However, as the demand for high-power batteries grows, there is a demand for a battery that is inexpensive and has a high weight density and high volume density and that can discharge a large amount of power. On the other hand, as a unit cell (battery cell), a high-potential type lithium ion secondary battery has appeared, and a secondary battery having a lightweight laminate film as an exterior body has become mainstream.

そこでラミネートフィルムを外装体とする軽量かつ大容量のリチウムイオン二次電池を用いた小型軽量の大電力バッテリを早期に開発する必要性が出てきた。   Therefore, there has been a need for early development of a small and light high-power battery using a light-weight and large-capacity lithium ion secondary battery having a laminate film as an outer package.

特に自動車用バッテリには急速充放電特性及び高サイクル寿命が要求されるため、バッテリの低抵抗化、急速充電による発熱問題、バッテリ内部のセルバランス制御、精度の高いサイクル寿命推定回路等、早期に解決すべき課題が多数存在する。例えば、二次電池は充放電時に正極と負極の活物質が膨張、収縮するが、電池の特性および寿命はこの膨張、収縮により影響を受ける。電池缶の場合、充放電時の電池の膨らみを、電池缶によってある程度抑制することができるため、電池の膨らみを抑制するための荷重は少なくて済むが、ラミネート型電池の場合、外装のラミネートフィルムによって電池の膨らみを抑制することは殆どできない。   Especially for automobile batteries, quick charge / discharge characteristics and high cycle life are required, so low resistance of the battery, heat generation problem due to quick charge, cell balance control inside the battery, accurate cycle life estimation circuit, etc. at an early stage There are many issues to be solved. For example, in a secondary battery, the active material of the positive electrode and the negative electrode expands and contracts during charging and discharging, but the characteristics and life of the battery are affected by the expansion and contraction. In the case of battery cans, the battery can during the charging / discharging can be suppressed to some extent by the battery cans, so the load to suppress the battery swelling can be reduced. Therefore, the swelling of the battery can hardly be suppressed.

このような課題に対して、活物質層を形状保持可能な厚みを有し、かつ充放電可能な集電体で挟持することで電池の変形を抑制し、かつ放熱特性も改善する二次電池が開示されている（例えば特許文献１参照）。
特開２００２−３１３３４８号公報 In response to such a problem, the secondary battery has a thickness capable of maintaining the shape of the active material layer, and suppresses deformation of the battery by sandwiching it with a chargeable / dischargeable current collector and improves heat dissipation characteristics. Is disclosed (for example, see Patent Document 1).
JP 2002-313348 A

しかしながら、二次電池内部の発電要素体で発生した熱を集電体で吸熱し、この吸熱した熱を電極および外装体から外部に放熱する構成では、放熱量が十分でない場合がある。また、ラミネートフィルムを外装体とする扁平型二次電池は、ラミネートフィルムが変形しやすいため、組電池として用いる場合、あるいは電池ケースに収納した場合、安定した実装を実現するのが困難な場合があった。   However, in a configuration in which heat generated by the power generation element inside the secondary battery is absorbed by the current collector and the absorbed heat is radiated to the outside from the electrode and the exterior body, the heat radiation amount may not be sufficient. In addition, flat secondary batteries with a laminate film as an outer package are prone to deformation, so when used as an assembled battery or housed in a battery case, it may be difficult to achieve stable mounting. there were.

そこで、本発明は、放熱効率が高められた扁平型二次電池および組電池を提供することを第１の目的とする。   Therefore, a first object of the present invention is to provide a flat secondary battery and an assembled battery with improved heat dissipation efficiency.

また、固定が容易な扁平型二次電池および組電池を提供することを第２の目的とする。   A second object is to provide a flat secondary battery and an assembled battery that can be easily fixed.

上記目的を達成するため、本発明の扁平型二次電池は、活物質が塗布された極板を有する複数の電極体と複数のセパレータとを積層してなる発電要素体と、前記発電要素体を被覆する、可塑性を有し、前記電極体に電気的に接触している電極端子が延出している辺を含む外装材とを有する扁平型二次電池において、
前記発電要素体に対して伝熱可能に接触している少なくとも１つの放熱用部材を有し、前記放熱用部材が、前記外装材の、前記電極端子が延出していない辺から延出していることを特徴とする。 In order to achieve the above object, a flat secondary battery according to the present invention includes a power generation element body formed by laminating a plurality of electrode bodies having an electrode plate coated with an active material and a plurality of separators, and the power generation element body. In a flat type secondary battery having a plasticity and an exterior material including a side extending from an electrode terminal in electrical contact with the electrode body,
It has at least one heat radiating member in contact with the power generating element body so that heat can be transferred, and the heat radiating member extends from a side of the exterior material where the electrode terminal does not extend. It is characterized by that.

上記のとおり、本発明の扁平型二次電池は、発電要素体で発生した熱を放熱する放熱用部材が電極端子の延出していない辺から延出している構造を有するため、電極端子の寸法による制限を受けることなく放熱用部材の放熱面積を確保することができるとともに、放熱用部材が電極端子から離れた位置に設けられることとなるため、電極端子からの放熱の影響を受けにくい。   As described above, the flat secondary battery of the present invention has a structure in which the heat dissipating member that dissipates the heat generated in the power generation element body extends from the side where the electrode terminal does not extend. The heat radiation area of the heat radiating member can be secured without being restricted by the above, and the heat radiating member is provided at a position away from the electrode terminal, so that it is difficult to be affected by the heat radiated from the electrode terminal.

また、本発明の扁平型二次電池は、放熱用部材が、セパレータに伝熱可能に接触しているものであってもよいし、極板に伝熱可能に接触しているものであってもよいし、あるいは、活物質に伝熱可能に接触しているものであってもよい。   In the flat secondary battery of the present invention, the heat radiating member may be in contact with the separator so as to be able to conduct heat, or may be in contact with the electrode plate so as to be able to conduct heat. Alternatively, it may be in contact with the active material so that heat can be transferred.

また、本発明の扁平型二次電池は、放熱用部材が、隣接するセパレータの間、隣接する活物質の間、および隣接する極板の間のいずれかに挟持されているものであってもよい。   In the flat secondary battery of the present invention, the heat dissipation member may be sandwiched between adjacent separators, between adjacent active materials, and between adjacent electrode plates.

また、本発明の扁平型二次電池は、放熱用部材が、発電要素体を挟持して伝熱可能に接触しているものであってもよい。この場合、放熱用部材が発電要素体を最外層側から挟み込んで保持するため、放熱用部材が、発電要素体を外部からの衝撃や振動から保護する保護部材としても機能する。   In the flat secondary battery of the present invention, the heat dissipating member may be in contact with the power generating element body so as to transfer heat. In this case, since the heat dissipating member sandwiches and holds the power generating element body from the outermost layer side, the heat dissipating member also functions as a protective member that protects the power generating element body from external impact and vibration.

また、本発明の扁平型二次電池は、放熱用部材が、金属板からなるものであってもよい。この場合、外装材が変形しやすい本発明の扁平型二次電池において固定保持のための固定部材を別途設けることなく、金属板からなる放熱用部材を固定部材として用いることができる。   In the flat secondary battery of the present invention, the heat dissipation member may be a metal plate. In this case, a heat radiating member made of a metal plate can be used as the fixing member without separately providing a fixing member for fixing and holding in the flat secondary battery of the present invention in which the exterior material is easily deformed.

本発明の組電池は、活物質が塗布された極板を有する電極体とセパレータとを積層してなる発電要素体と、前記電極体に電気的に接続されている電極端子と、前記発電要素体を被覆する可塑性を有する外装材とを有する扁平型二次電池の前記各電極端子を電気的に接続してなる組電池において、前記扁平型二次電池が、本発明の扁平型二次電池であることを特徴とする。   The assembled battery of the present invention includes a power generation element body formed by laminating an electrode body having an electrode plate coated with an active material and a separator, an electrode terminal electrically connected to the electrode body, and the power generation element An assembled battery obtained by electrically connecting the electrode terminals of a flat secondary battery having a plastic packaging material that covers the body, wherein the flat secondary battery is the flat secondary battery of the present invention. It is characterized by being.

上記のとおり本発明の扁平型二次電池による組電池は、発電要素体で発生した熱を放熱する放熱用部材が電極端子の延出していない辺から延出している構造を有するため、電極端子の寸法による制限を受けることなく放熱用部材の放熱面積を確保することができるとともに、放熱用部材が電極端子から離れた位置に設けられることとなるため、電極端子からの放熱の影響を受けにくい。さらには、各電極端子を電気的に接合して組電池化する際にも、電極端子と同じ辺に放熱用部材が設けられているような構成に比べ、放熱用部材の存在に煩わされることなく容易に接合し組電池化することができる。   As described above, the assembled battery using the flat secondary battery according to the present invention has a structure in which the heat radiating member for radiating the heat generated in the power generation element body extends from the side where the electrode terminal does not extend. The heat radiating area of the heat radiating member can be secured without being restricted by the size of the heat radiating member, and the heat radiating member is provided at a position away from the electrode terminal, so that it is not easily affected by heat radiated from the electrode terminal. . Furthermore, even when each electrode terminal is electrically joined to form an assembled battery, it is bothered by the existence of a heat radiating member compared to a configuration in which a heat radiating member is provided on the same side as the electrode terminal. And can be easily joined to form an assembled battery.

また、本発明の組電池は、活物質が塗布された極板を有する電極体とセパレータとを積層してなる発電要素体と、前記電極体に電気的に接続されている電極端子と、前記発電要素体を被覆する可塑性を有する外装材とを有する扁平型二次電池の前記各電極端子を電気的に接続してなる組電池において、金属板からなる放熱用部材を有する本発明の扁平型二次電池であり、前記各扁平型二次電池が前記各放熱用部材を互いに接合して固定保持されていることを特徴とする。   The assembled battery of the present invention includes a power generating element body formed by laminating an electrode body having an electrode plate coated with an active material and a separator, an electrode terminal electrically connected to the electrode body, A flat battery of the present invention having a heat radiating member made of a metal plate in an assembled battery formed by electrically connecting the respective electrode terminals of a flat secondary battery having a plastic packaging material covering a power generating element body. It is a secondary battery, and each of the flat secondary batteries is fixed and held by joining the heat dissipating members to each other.

上記のとおり本発明の扁平型二次電池による組電池は、別途固定部材を設けることなく、金属板からなる放熱用部材を固定部材として各扁平型二次電池どうしを固定することができる。   As described above, the assembled battery using the flat secondary battery according to the present invention can fix the flat secondary batteries to each other by using a heat radiating member made of a metal plate as a fixing member without providing a separate fixing member.

以上説明したように本発明によれば、放熱用部材が電極端子の延出していない辺から延出しているため、電極端子による、寸法的な制限、あるいは放熱の影響を受けにくく、よって、放熱効果を高めることができた。また、金属板からなる放熱用部材を固定部材として用いることで、固定を容易なものとすることができた。   As described above, according to the present invention, since the heat radiation member extends from the side where the electrode terminal does not extend, it is difficult to be affected by dimensional limitation or heat radiation by the electrode terminal. The effect could be enhanced. Moreover, fixing can be made easy by using a heat radiating member made of a metal plate as a fixing member.

次に、本発明の実施の形態について図面を参照して説明する。
（第１の実施形態）
図１〜図３を用いて本実施形態の扁平型ラミネートフィルム二次電池について以下に説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
The flat laminate film secondary battery of this embodiment will be described below with reference to FIGS.

図１は、放熱板を備えた本実施形態の扁平型ラミネートフィルム二次電池の平面図である。本実施形態の扁平型ラミネートフィルム二次電池は、矩形形状の発電要素体が矩形形状のラミネートフィルムに被覆され、その４辺のうちの２辺から正負極の電極が延出した構造を有する。図１（ａ）は、電極が延出していない２辺のうちの片側の辺からのみ放熱板が延出した構成例を示したものであり、図１（ｂ）は、電極が延出していない２辺両側から放熱板が延出した構成例を示したものである。   FIG. 1 is a plan view of a flat laminate film secondary battery of this embodiment provided with a heat sink. The flat laminate film secondary battery of this embodiment has a structure in which a rectangular power generating element body is covered with a rectangular laminate film, and positive and negative electrodes extend from two of the four sides. FIG. 1A shows a configuration example in which the heat sink extends only from one side of the two sides where the electrode does not extend, and FIG. 1B shows that the electrode extends. The example of a structure which the heat sink extended from two sides which are not present is shown.

図２は、本実施形態の扁平型ラミネートフィルム二次電池に用いられる発電要素体の構造を示す模式図である。   FIG. 2 is a schematic diagram showing the structure of a power generation element body used in the flat laminate film secondary battery of this embodiment.

図３は、発電要素体の積層構造を説明するための模式図であり、図３（ａ）は、図１（ａ）に示した、電極の延出していない２辺のうちの片側の辺からのみ放熱板が延出した構成を示す模式図であり、図３（ｂ）は、図１（ｂ）に示した両側の辺から放熱板が延出した構成を示す模式図である。図３（ａ）および図３（ｂ）の各図は、図１（ａ）および図１（ｂ）に示す矢印Ａ方向にみた断面図である。   FIG. 3 is a schematic diagram for explaining the laminated structure of the power generation element body. FIG. 3A is a side on one side of the two sides where the electrode does not extend, as shown in FIG. It is a schematic diagram which shows the structure which the heat sink extended from only, and FIG.3 (b) is a schematic diagram which shows the structure where the heat sink extended from the edge | side of the both sides shown in FIG.1 (b). 3A and 3B are cross-sectional views as viewed in the direction of arrow A shown in FIGS. 1A and 1B.

扁平型ラミネートフィルム二次電池１は、電解液を含浸させたセパレータ７、セパレータ７を介して積層された正極体５および負極体６を有する積層型の発電要素体８と、発電要素体８で発生した熱を外部に放出するため、２枚の隣接するセパレータ７に挟み込まれて保持されている放熱板４と、放熱板４を有する矩形形状の発電要素体８の外装体となる矩形形状のラミネートフィルム９とを有する。   The flat laminate film secondary battery 1 includes a separator 7 impregnated with an electrolytic solution, a laminated power generation element 8 having a positive electrode body 5 and a negative electrode body 6 laminated via the separator 7, and a power generation element body 8. In order to release the generated heat to the outside, the rectangular heat sink 4 sandwiched between two adjacent separators 7 and the rectangular power generation element body 8 having the heat sink 4 are rectangular. And a laminate film 9.

また、本実施形態の扁平型ラミネートフィルム二次電池１は、長さｅ、幅ｆのラミネートフィルム９の辺９ａ、９ｂのそれぞれより正電極端子２および負電極端子３が延出し、図１（ａ）の構成においては辺９ｃのみから放熱板４を延出させ、図１（ｂ）の構成においては辺９ｃおよび辺９ｄから放熱板４を延出させている。すなわち、扁平型ラミネートフィルム二次電池１の外装体であるラミネートフィルム９は、正電極端子２および負電極端子３が延出し、放熱板４が延出していない辺９ａ、９ｂと、放熱板４が延出し、正電極端子２および負電極端子３が延出していない辺９ｃ、辺９ｄを有する。   Further, in the flat laminate film secondary battery 1 of the present embodiment, the positive electrode terminal 2 and the negative electrode terminal 3 extend from the sides 9a and 9b of the laminate film 9 having a length e and a width f, respectively. In the configuration of a), the heat sink 4 is extended only from the side 9c, and in the configuration of FIG. 1B, the heat sink 4 is extended from the side 9c and the side 9d. That is, the laminate film 9 which is an outer package of the flat laminate film secondary battery 1 has sides 9a and 9b in which the positive electrode terminal 2 and the negative electrode terminal 3 extend and the heat sink 4 does not extend, and the heat sink 4 And the positive electrode terminal 2 and the negative electrode terminal 3 have sides 9c and 9d that do not extend.

正極体５は、リチウムイオンを吸蔵・放出するリチウムイオン含有金属酸化物のリチウムマンガン複合酸化物である正極活物質５ａがアルミ箔シート５ｂの両面に塗布されてなるものである。   The positive electrode body 5 is formed by applying a positive electrode active material 5a, which is a lithium manganese composite oxide of a lithium ion-containing metal oxide that occludes / releases lithium ions, to both surfaces of an aluminum foil sheet 5b.

負極体６は、リチウムイオンを吸蔵・放出するハードカーボン系の負極活物質６ａが銅箔シート６ｂの両面に塗布されてなるものである。   The negative electrode body 6 is formed by applying a hard carbon negative electrode active material 6a that occludes / releases lithium ions to both surfaces of a copper foil sheet 6b.

セパレータ７は、多孔性絶縁樹脂薄膜シートからなり、プロピレンカーボネートとメチルエチルカーボネートの非水系溶媒に六フッ化リン酸リチウムを溶解させた電解液を含浸保持する。   The separator 7 is made of a porous insulating resin thin film sheet, and impregnates and holds an electrolytic solution in which lithium hexafluorophosphate is dissolved in a non-aqueous solvent of propylene carbonate and methyl ethyl carbonate.

放熱板４の材質は、アルミニウム、銅、あるいは銅メッキ処理がなされた金属が好適であるが、熱伝導性が高く、使用される電極と電位差を生じて溶出しないような材質であれば、いかなる材料であってもよい。   The material of the heat sink 4 is preferably aluminum, copper, or a metal plated with copper. However, any material can be used as long as it has high thermal conductivity and does not elute due to potential difference with the electrode used. It may be a material.

ラミネートフィルム９は、アルミニウムなどの金属層と熱溶着性の樹脂層とを接着剤層を介して重ね合わせてなるものである。   The laminate film 9 is formed by superposing a metal layer such as aluminum and a heat-welding resin layer via an adhesive layer.

次に、扁平型ラミネートフィルム二次電池１の作製方法について説明する。   Next, a method for producing the flat laminate film secondary battery 1 will be described.

まず、図２に示すように正極体５と負極体６とをセパレータ７を介しながら積層して発電要素体８を形成する。   First, as shown in FIG. 2, the power generating element body 8 is formed by laminating the positive electrode body 5 and the negative electrode body 6 with the separator 7 interposed therebetween.

次いで図３に示すように発電要素体８の正極体５と負極体６の電極の間に２枚の隣接するセパレータ７を介して放熱板４を設ける。すなわち、放熱板４は、正極体５の正極活物質５ａに接触するセパレータ７と、負極体６の負極活物質６ａに接触するセパレータ７とに可能に接触し、挟持される。この際、図１（ａ）に示す、幅ａ、長さｂの放熱板４は、長さｃだけ辺９ｃから延出させて延出部４ａが形成されるようにして２枚のセパレータ７で挟持する。放熱板４は、電解液に対する耐性を有する接着剤によってセパレータ７に接着固定されているものであってもよい。   Next, as shown in FIG. 3, the heat radiating plate 4 is provided between the positive electrode body 5 and the negative electrode body 6 of the power generation element body 8 via two adjacent separators 7. That is, the heat sink 4 is in contact with and sandwiched between the separator 7 that contacts the positive electrode active material 5 a of the positive electrode body 5 and the separator 7 that contacts the negative electrode active material 6 a of the negative electrode body 6. At this time, the heat radiating plate 4 having a width a and a length b shown in FIG. 1A is extended from the side 9c by the length c to form an extended portion 4a, so that two separators 7 are formed. Hold with. The heat radiating plate 4 may be bonded and fixed to the separator 7 with an adhesive having resistance to the electrolytic solution.

次に、正極体５にアルミニウムからなる正電極端子２を、負極体６にニッケルからなる負電極端子３を超音波溶接により取り付ける。   Next, the positive electrode terminal 2 made of aluminum is attached to the positive electrode body 5, and the negative electrode terminal 3 made of nickel is attached to the negative electrode body 6 by ultrasonic welding.

以上のようにして、放熱板４を２枚の隣接するセパレータ７の間に挟持し、正電極端子２および負電極端子３を取り付けた発電要素体８をラミネートフィルム９で包み、例えば、辺９ａ以外の３辺を熱融着封止した後、非水系電解液を注入し、減圧下で完全封止を行って扁平型ラミネートフィルム二次電池１が作製される。   As described above, the heat generating plate 4 is sandwiched between two adjacent separators 7, and the power generating element body 8 to which the positive electrode terminal 2 and the negative electrode terminal 3 are attached is wrapped with the laminate film 9, for example, the side 9a After the other three sides are heat-sealed and sealed, a non-aqueous electrolyte solution is injected, and complete sealing is performed under reduced pressure to produce the flat laminate film secondary battery 1.

なお、図１（ｂ）に示す、辺９ｃおよび辺９ｄの双方から放熱板４が延出した扁平型ラミネートフィルム二次電池１を作製する場合は、放熱板４として、ラミネートフィルム９の幅ｆよりも長い長さｄのものを用い、これを図３（ｂ）に示すように延出部４ａ、４ｂが形成されるようにしてセパレータ７で挟持する。   In addition, when producing the flat laminate film secondary battery 1 in which the heat sink 4 extends from both the sides 9c and 9d shown in FIG. 1B, the width f of the laminate film 9 is used as the heat sink 4. The one having a longer length d is used and is sandwiched between the separators 7 so that the extended portions 4a and 4b are formed as shown in FIG.

また、複数の放熱板４を用いる場合には、例えば、図３（ｃ）に示すように、放熱板４を正極体５と負極体６との間のセパレータ７に挟持して辺９ｃから延出させるとともに、正極体５、負極体６およびセパレータ７からなる層とは異なる層となる正極体５’と負極体６’の間のセパレータ７’に放熱板４を挟持して辺９ｄから延出させる構成とするものであってもよい。図３（ｃ）はセパレータ７に挟持されている放熱板４とセパレータ７’に挟持されている放熱板４とは互いに異なる辺９ｃ、９ｄから延出するように構成されているが、辺９ｃ、９ｄのいずれか一辺から延出させる構成としてもよい。この他、複数の放熱板４を用いる場合には、図３（ｄ）に示すように正極体５、負極体６およびセパレータ７からなるひとつの層に２枚の放熱板４を並べて配置し、辺９ｃおよび辺９ｄの双方から延出させる構成としてもよい。   When a plurality of heat sinks 4 are used, for example, as shown in FIG. 3C, the heat sink 4 is sandwiched between separators 7 between the positive electrode body 5 and the negative electrode body 6 and extends from the side 9c. The heat sink 4 is sandwiched between the positive electrode body 5 ′ and the negative electrode body 6 ′, which is a layer different from the positive electrode body 5, the negative electrode body 6, and the separator 7, and extends from the side 9 d. You may make it the structure made to take out. In FIG. 3C, the heat radiating plate 4 sandwiched between the separators 7 and the heat radiating plate 4 sandwiched between the separators 7 ′ are configured to extend from different sides 9c and 9d. , 9d may be extended from any one side. In addition, when using a plurality of heat sinks 4, as shown in FIG. 3D, two heat sinks 4 are arranged side by side in one layer consisting of a positive electrode body 5, a negative electrode body 6 and a separator 7, It is good also as a structure extended from both sides 9c and 9d.

また、封止性を高めるために、図１（ａ）に示す放熱板４の幅ａを、ラミネートフィルム９の長さｅに対して、ラミネートフィルム９どうしが熱融着される領域９ｅを十分に確保できる寸法とし、辺９ｃ、９ｄの中央部分に配置すると好適である。また、扁平型ラミネートフィルム二次電池１は中央部分に熱がこもる場合が多いため、中央部分にこもった熱を効率よく放熱する意味でも放熱板４を辺９ｃ、９ｄの中央部分に配置するのが好ましい。なお、放熱板４の、ラミネートフィルム９で封止される部分は、熱融着性の良好な樹脂で被覆されているものであってもよい。この場合、放熱面積を確保するために放熱板４の寸法ａを長くとることが可能となる。   Further, in order to improve the sealing performance, the width a of the heat sink 4 shown in FIG. 1A is sufficiently larger than the length e of the laminate film 9, and the region 9e where the laminate films 9 are heat-sealed is sufficient. It is preferable that the dimensions be secured at the center of the sides 9c and 9d. Further, since the flat laminate film secondary battery 1 often accumulates heat in the central portion, the heat radiating plate 4 is disposed in the central portion of the sides 9c and 9d in order to efficiently dissipate the heat accumulated in the central portion. Is preferred. In addition, the part sealed with the laminate film 9 of the heat sink 4 may be coat | covered with resin with favorable heat-fusion property. In this case, the dimension a of the heat radiating plate 4 can be made long in order to secure the heat radiating area.

また、放熱板４の、ラミネートフィルム９から延出している延出部４ａ、４ｂの断面形状は、正弦波形状、三角波形状、矩形形状等の波形状など、平面に比べて放熱面積を大きくすることができる形状であってもよい。なお、扁平型ラミネートフィルム二次電池１を使用する際、扁平型ラミネートフィルム二次電池１を冷却するための冷却風が外部から供給される場合には、冷却風の流れを乱さないように、冷却風の流れ方向には断面形状が実質的に変化していない形状とするのが好適である。   In addition, the cross-sectional shape of the extended portions 4a and 4b extending from the laminate film 9 of the heat radiating plate 4 has a heat radiating area larger than that of a flat surface such as a sine wave shape, a triangular wave shape, or a rectangular shape. The shape which can be used may be sufficient. In addition, when using the flat laminate film secondary battery 1, when cooling air for cooling the flat laminate film secondary battery 1 is supplied from the outside, so as not to disturb the flow of the cooling air, It is preferable that the cross-sectional shape is not substantially changed in the flow direction of the cooling air.

以上の構成の本実施形態の扁平型ラミネートフィルム二次電池１は、充放電時に発電要素体８で発生する熱の大部分は、正電極端子２、負電極端子３、およびラミネートフィルム９の外面に加えて放熱板４より放熱されるため、電極端子および外装体のみから大部分の放熱を行う構成に比べ、放熱量を多くすることができる。   In the flat laminate film secondary battery 1 of the present embodiment having the above-described configuration, most of the heat generated in the power generating element body 8 during charging / discharging is the outer surface of the positive electrode terminal 2, the negative electrode terminal 3, and the laminate film 9. In addition, since heat is radiated from the heat radiating plate 4, the amount of heat radiated can be increased as compared with the configuration in which most of the heat is radiated only from the electrode terminals and the exterior body.

また、本実施形態の扁平型ラミネートフィルム二次電池１は、正電極端子２、負電極端子３が延出している辺９ａ、９ｂ以外の辺９ｃあるいは辺９ｃ、９ｄから放熱板４を延出させ、発熱体となっている正電極端子２および負電極端子３から離れた位置に設けられているため、放熱効率を高めることができる。仮に放熱板４を、正電極端子２あるいは負電極端子３と同じ辺９ａ、９ｂに設けた場合、放熱板４周辺の空気の温度が正電極端子２あるいは負電極端子３からの熱により上昇してしまい、放熱板４からの放熱効率が低下してしまう。しかしながら、本実施形態のように正電極端子２あるいは負電極端子３から離れた位置に設けることで、正電極端子２あるいは負電極端子３による放熱の影響を受けにくくすることができるため、高い放熱効率を得ることができる。   Further, the flat laminate film secondary battery 1 of the present embodiment extends the heat dissipation plate 4 from the side 9c or the sides 9c, 9d other than the sides 9a, 9b from which the positive electrode terminal 2 and the negative electrode terminal 3 extend. In addition, since it is provided at a position away from the positive electrode terminal 2 and the negative electrode terminal 3 which are heating elements, the heat dissipation efficiency can be improved. If the heat radiating plate 4 is provided on the same sides 9 a and 9 b as the positive electrode terminal 2 or the negative electrode terminal 3, the temperature of the air around the heat radiating plate 4 rises due to the heat from the positive electrode terminal 2 or the negative electrode terminal 3. As a result, the heat dissipation efficiency from the heat sink 4 is reduced. However, by providing at a position away from the positive electrode terminal 2 or the negative electrode terminal 3 as in the present embodiment, it is possible to make it less susceptible to the heat radiation by the positive electrode terminal 2 or the negative electrode terminal 3, and thus high heat dissipation. Efficiency can be obtained.

このように、放熱板４により放熱効率が高められることで、発電要素体８にかかる熱負荷が小さくなるので長寿命化も期待できる。   As described above, since the heat dissipation efficiency is enhanced by the heat radiating plate 4, the heat load applied to the power generating element body 8 is reduced, so that a long life can be expected.

また、放熱板４を正電極端子２、負電極端子３が延出している辺９ａ、９ｂ以外の辺９ｃあるいは辺９ｃ、９ｄから延出させているため、正電極端子２、負電極端子３の寸法に影響されることなく、放熱板４の延出部４ａ、４ｂの寸法を設定することができる。これにより、所望の放熱量を確保しやすくなる。   Further, since the heat sink 4 is extended from the side 9c or the sides 9c, 9d other than the sides 9a, 9b from which the positive electrode terminal 2 and the negative electrode terminal 3 extend, the positive electrode terminal 2, the negative electrode terminal 3 The dimensions of the extended portions 4a and 4b of the heat radiating plate 4 can be set without being affected by the dimensions. Thereby, it becomes easy to ensure a desired heat radiation amount.

また、放熱板４は放熱用の部材としてだけでなく固定用の部材として機能させることもできる。例えば、複数の扁平型ラミネートフィルム二次電池１により組電池を構成する場合、互いの放熱板４を接合させることで電池どうしを固定することができる。また、扁平型ラミネートフィルム二次電池１を電池ケースに収納する場合には、電池ケースの壁面と放熱板４とを接合することで、電池ケースに対して扁平型ラミネートフィルム二次電池１を固定することができる。このように、本実施形態によれば、固定のための部材を改めて設けることなく電池どうし、あるいは電池ケースに扁平型ラミネートフィルム二次電池１を固定することができる。
（第２の実施形態）
図４（ａ）、図４（ｂ）に本実施形態の扁平型ラミネートフィルム二次電池における発電要素体の積層構造を説明するための模式図を示す。図４（ａ）は、電極の延出していない２辺のうちの片側の辺からのみ放熱板が延出した構成を示す模式図であり、図４（ｂ）は、両側の辺から放熱板が延出した構成を示す模式図である。 Further, the heat radiating plate 4 can function not only as a heat radiating member but also as a fixing member. For example, when an assembled battery is comprised by the some flat laminate film secondary battery 1, a battery can be fixed by joining the heat sink 4 of each other. When the flat laminate film secondary battery 1 is stored in the battery case, the flat laminate film secondary battery 1 is fixed to the battery case by bonding the wall surface of the battery case and the heat sink 4. can do. Thus, according to this embodiment, the flat laminate film secondary battery 1 can be fixed to each other or to the battery case without providing a fixing member anew.
(Second Embodiment)
4A and 4B are schematic views for explaining the laminated structure of the power generating element body in the flat laminate film secondary battery of the present embodiment. FIG. 4A is a schematic diagram showing a configuration in which the heat radiating plate extends only from one side of the two sides where the electrodes do not extend, and FIG. 4B shows the heat radiating plate from both sides. It is a schematic diagram which shows the structure which extended.

第１の実施形態では、正極体５と負極体６との電極の間の２枚の隣接するセパレータ７で放熱板４を挟持する構成を示したが、本実施形態の扁平型ラミネートフィルム二次電池は、２組の正極体１５の隣接する各正極活物質１５ａが放熱板１４の両面に伝熱可能に接触するようにして放熱板１４を挟持する構成としている。すなわち、本実施形態の発電要素体１８は、基本的には正極体１５と負極体１６とがセパレータ１７を介して交互に積層された構造を有するが、放熱板１４が設けられた層のみ、正極体１５が連続して積層されており、この２組の正極体１５の間に放熱板１４が挟み込まれた構成となっている。   In 1st Embodiment, although the structure which clamps the heat sink 4 with the two adjacent separators 7 between the electrode of the positive electrode body 5 and the negative electrode body 6 was shown, the flat type laminate film secondary of this embodiment is shown. The battery is configured such that each of the adjacent positive electrode active materials 15a of the two sets of positive electrode bodies 15 is in contact with both surfaces of the heat radiating plate 14 so as to be able to transfer heat, and the heat radiating plate 14 is sandwiched. That is, the power generating element body 18 of the present embodiment basically has a structure in which the positive electrode bodies 15 and the negative electrode bodies 16 are alternately stacked via the separators 17, but only the layer provided with the heat sink 14, The positive electrode body 15 is laminated | stacked continuously, and it has the structure by which the heat sink 14 was inserted | pinched between these two sets of positive electrode bodies 15. FIG.

なお、これ以外の基本的な構成は、第１の実施形態に示した扁平型ラミネートフィルム二次電池と同様であるため詳細な説明は省略する。   Since the basic configuration other than this is the same as that of the flat laminate film secondary battery shown in the first embodiment, detailed description thereof is omitted.

本実施形態では２組の正極体１５の各正極活物質１５ａ間に放熱板１４が伝熱可能に接触して挟持される構成を示したが、２組の負極体１６の隣接する各負極活物質１６ａ間に放熱板１４が挟持される構成としてもよい。   In the present embodiment, the configuration in which the heat dissipation plate 14 is sandwiched between the positive electrode active materials 15a of the two sets of positive electrode bodies 15 so as to be capable of transferring heat is shown. The heat dissipation plate 14 may be sandwiched between the substances 16a.

本実施形態も、第１の実施形態と同様に、電極端子が延出している辺以外の辺から放熱板４を延出させているので、電極端子による寸法上の制限を受けず、かつ電極端子からの放熱の影響を受けにくいので放熱効率を高めることができ、よって、発電要素体８にかかる熱負荷が小さくなり、電池の長寿命化を図ることができる。また、第１の実施形態と同様に、本実施形態の放熱板１４も固定部材として用いることができる。
（第３の実施形態）
図５（ａ）、図５（ｂ）に本実施形態の扁平型ラミネートフィルム二次電池における発電要素体の積層構造を説明するための模式図を示す。図５（ａ）は、電極の延出していない２辺のうちの片側の辺からのみ放熱板が延出した構成を示す模式図であり、図５（ｂ）は、両側の辺から放熱板が延出した構成を示す模式図である。 Similarly to the first embodiment, this embodiment also extends the heat dissipation plate 4 from a side other than the side from which the electrode terminal extends, and thus is not subject to dimensional restrictions due to the electrode terminal, and the electrode. Since it is difficult to be affected by the heat radiation from the terminals, the heat radiation efficiency can be increased. Therefore, the thermal load applied to the power generation element body 8 is reduced, and the battery life can be extended. Further, similarly to the first embodiment, the heat sink 14 of the present embodiment can also be used as a fixing member.
(Third embodiment)
5A and 5B are schematic views for explaining the laminated structure of the power generating element body in the flat laminate film secondary battery of the present embodiment. FIG. 5A is a schematic diagram showing a configuration in which the heat radiating plate extends only from one side of the two sides where the electrode does not extend, and FIG. 5B shows the heat radiating plate from both sides. It is a schematic diagram which shows the structure which extended.

本実施形態の扁平型ラミネートフィルム二次電池の発電要素体２８は、アルミ箔シート２５ｂの片面にのみ正極活物質２５ａが塗布された２枚の正極体２５を有しており、これら２枚の隣接する正極体２５を、正極活物質２５ａが塗布されていないアルミ箔シート２５ｂの面２５ｂ’が向かい合うようにして配置し、その間に放熱板２４を挟み込んでいる。すなわち、上述した第２の実施形態の扁平型ラミネートフィルム二次電池は、各正極活物質１５ａが放熱板１４に接触する構成であったが、本実施形態は、２枚の隣接するアルミ箔シート２５ｂが放熱板２４に伝熱可能に接触する構成となっている。   The power generation element body 28 of the flat laminate film secondary battery of the present embodiment has two positive electrode bodies 25 in which the positive electrode active material 25a is applied only on one surface of the aluminum foil sheet 25b. The adjacent positive electrode bodies 25 are arranged so that the surface 25b ′ of the aluminum foil sheet 25b to which the positive electrode active material 25a is not applied face each other, and the heat sink 24 is sandwiched therebetween. That is, the flat laminate film secondary battery of the second embodiment described above has a configuration in which each positive electrode active material 15a is in contact with the heat dissipation plate 14, but this embodiment has two adjacent aluminum foil sheets. 25b is in contact with the heat radiating plate 24 so that heat can be transferred.

本実施形態では正極体２５のアルミ箔シート２５ｂ間に放熱板を挟持する構成を示したが、放熱板が負極体の２枚の隣接する銅箔シート間に伝熱可能に接触して挟持される構成としてもよい。   In the present embodiment, a configuration is shown in which a heat sink is sandwiched between the aluminum foil sheets 25b of the positive electrode body 25, but the heat sink is sandwiched in contact with heat transfer between two adjacent copper foil sheets of the negative electrode body. It is good also as composition to be.

本実施形態も、第１および第２の実施形態と同様に、電極端子が延出している辺以外の辺から放熱板２４を延出させているので、電極端子の寸法による寸法的な制限を受けず、かつ電極端子からの放熱の影響を受けにくいので放熱効率を高めることができ、よって、発電要素体２８にかかる熱負荷が小さくなり、電池の長寿命化を図ることができる。また、上述した各実施形態と同様に、本実施形態の放熱板２４も固定部材として用いることができる。
（第４の実施形態）
図６に本実施形態の扁平型ラミネートフィルム二次電池における発電要素体の積層構造を説明するための模式図を、図７に本実施形態の扁平型ラミネートフィルム二次電池を用いた組電池の外観斜視図をそれぞれ示す。 In the present embodiment, as in the first and second embodiments, the heat radiation plate 24 is extended from a side other than the side from which the electrode terminal is extended. The heat radiation efficiency can be increased because the heat radiation is not affected and the heat radiation from the electrode terminal is not affected. Therefore, the heat load applied to the power generating element body 28 is reduced, and the battery life can be extended. Further, similarly to the above-described embodiments, the heat radiating plate 24 of the present embodiment can also be used as a fixing member.
(Fourth embodiment)
FIG. 6 is a schematic diagram for explaining the laminated structure of the power generating element body in the flat laminate film secondary battery of the present embodiment, and FIG. 7 is an assembled battery using the flat laminate film secondary battery of the present embodiment. An external perspective view is shown respectively.

上述した各実施形態の放熱板は平板形状であり、発電要素体の積層構造内に配置され、セパレータ、正極体、あるいは負極体に挟持されるものを例示したが、本実施形態の放熱板３４は、放熱部３４ｆと、分岐部３４ｅで二股に分岐した第１の吸熱部３４ｃおよび第２の吸熱部３４ｄとを有し、第１の吸熱部３４ｃおよび第２の吸熱部３４ｄにより発電要素体３８を押さえ込むように挟持する構成としている。   Although the heat sink of each embodiment described above has a flat plate shape and is disposed in the laminated structure of the power generation element body and is sandwiched between the separator, the positive electrode body, or the negative electrode body, the heat sink 34 of the present embodiment is exemplified. Has a heat radiating portion 34f and a first heat absorbing portion 34c and a second heat absorbing portion 34d that are bifurcated by a branch portion 34e. The power generating element body is formed by the first heat absorbing portion 34c and the second heat absorbing portion 34d. 38 is configured to be clamped so as to press down.

放熱板３４の第１の吸熱部３４ｃおよび第２の吸熱部３４ｄは、発電要素体３８の最外層となるセパレータ３７ａ、３７ｂに伝熱可能に接触することで、発電要素体３８にて発生した熱を吸熱する。第１の吸熱部３４ｃおよび第２の吸熱部３４ｄに吸熱された熱は、分岐部３４ｅを経由して放熱部３４ｆまで伝わり、ラミネートフィルム３９より延出した放熱部３４ｆから外部に放熱される。   The first heat absorption part 34c and the second heat absorption part 34d of the heat radiating plate 34 are generated in the power generation element body 38 by contacting the separators 37a and 37b, which are the outermost layers of the power generation element body 38, so that heat can be transferred. Absorbs heat. The heat absorbed by the first heat absorbing portion 34c and the second heat absorbing portion 34d is transmitted to the heat radiating portion 34f via the branch portion 34e, and is radiated to the outside from the heat radiating portion 34f extending from the laminate film 39.

また、本実施形態の扁平型ラミネートフィルム二次電池は、放熱板３４が、第１の吸熱部３４ｃおよび第２の吸熱部３４ｄが発電要素体３８の最外層を覆うようにして設けられているため、外部からの衝撃や振動から発電要素体３８を保護する保護部材としても機能する。   Further, in the flat laminate film secondary battery of this embodiment, the heat radiating plate 34 is provided so that the first heat absorbing portion 34 c and the second heat absorbing portion 34 d cover the outermost layer of the power generating element body 38. Therefore, it also functions as a protective member that protects the power generation element body 38 from external impact and vibration.

なお、図６では、第１の吸熱部３４ｃおよび第２の吸熱部３４ｄはセパレータ３７に伝熱可能に接触するようにして設けられているが、発電要素体３８が最外層にセパレータ３７を有しない場合は、正極体のアルミ箔シート、あるいは負極体の銅箔シートに、直接、第１の吸熱部３４ｃおよび第２の吸熱部３４ｄが伝熱可能に接触するようにして設けられているものであってもよい。   In FIG. 6, the first heat absorbing portion 34 c and the second heat absorbing portion 34 d are provided so as to contact the separator 37 so that heat can be transferred, but the power generating element body 38 has the separator 37 in the outermost layer. If not, the first heat absorbing portion 34c and the second heat absorbing portion 34d are provided so as to be in direct contact with the aluminum foil sheet of the positive electrode body or the copper foil sheet of the negative electrode body so that heat can be transferred. It may be.

図７に示す、１０個の扁平型ラミネートフィルム二次電池３１が積み重ねられて構成された組電池５０は、ラミネートフィルム３９の辺３９ｃから放熱板３４の放熱部３４ｆが延出部３４ａとして延出している。なお、図７には、延出部３４ａが片側に配列された構成の組電池５０を一例として示しているが、これに限定されるものでなく、例えば、延出部３４ａが両側に千鳥状に配列する等、組電池５０の利用形態に応じて適宜配列が変更されるものであってもよい。   As shown in FIG. 7, the assembled battery 50 configured by stacking the ten flat laminate film secondary batteries 31 extends from the side 39 c of the laminate film 39 as the extended portion 34 a of the heat radiating portion 34 f of the heat radiating plate 34. ing. In FIG. 7, the assembled battery 50 having the configuration in which the extending portions 34 a are arranged on one side is shown as an example, but the present invention is not limited to this. For example, the extending portions 34 a are staggered on both sides. The arrangement may be appropriately changed according to the usage form of the assembled battery 50, such as the arrangement of

本実施形態も、上述した各実施形態と同様に、電極端子が延出している辺以外の辺から放熱板３４の放熱部３４ｆを延出させているので、電極端子の寸法による寸法的な制限を受けず、かつ電極端子からの放熱の影響を受けにくいので放熱効率を高めることができ、よって、発電要素体３８にかかる熱負荷が小さくなり、電池の長寿命化を図ることができる。また、上述した各実施形態と同様に、本実施形態の放熱板３４も固定部材として用いることができる。   In the present embodiment, similarly to the above-described embodiments, the heat radiation portion 34f of the heat radiating plate 34 is extended from a side other than the side from which the electrode terminal extends, and therefore, the dimensional limitation due to the size of the electrode terminal. Therefore, it is possible to increase the heat dissipation efficiency, and thus the heat load applied to the power generation element body 38 is reduced, and the life of the battery can be extended. Further, similarly to the above-described embodiments, the heat radiating plate 34 of the present embodiment can also be used as a fixing member.

なお、上述した各実施形態は、どのように組み合わせるものであってもよい。例えば、放熱板を第４の実施形態に示したような分岐部と複数の吸熱部とを有するものとし、複数の吸熱部が複数のセパレータ間に挟持されている構成、複数の活物質間に挟持されている構成、複数の極板間に挟持されている構成、またはこれらを組み合わせた構成、さらには、これに加えて、発電要素体の最外層側から挟持させる構成等であってもよい。   Note that the above-described embodiments may be combined in any way. For example, the heat sink has a branch portion and a plurality of heat absorbing portions as shown in the fourth embodiment, and a configuration in which a plurality of heat absorbing portions are sandwiched between a plurality of separators, between a plurality of active materials. A sandwiched configuration, a configuration sandwiched between a plurality of electrode plates, a combination of these, a configuration in which the power generation element body is sandwiched from the outermost layer side, etc. .

次に、本発明の実施例について説明する。なお、以下に示す第１〜第４の実施例の扁平型ラミネートフィルム二次電池は、すべて、放熱板が図１（ｂ）に示される、ラミネートフィルムの両側から延出した構造のものを作製した。また、以下の説明では、上述した各実施形態で用いた符号により説明するものとする。
（第１の実施例）
本実施例では、本発明の第１の実施形態として図１（ｂ）、図３（ｂ）に示した、放熱板４がセパレータ７に挟持され、放熱板４がラミネートフィルム１の辺９ｃ、９ｄの両側から延出した構造の扁平型ラミネートフィルム二次電池を作製した。 Next, examples of the present invention will be described. The flat laminate film secondary batteries of the first to fourth embodiments shown below are all manufactured with a structure in which the heat sink extends from both sides of the laminate film as shown in FIG. did. Moreover, in the following description, it shall be demonstrated with the code | symbol used by each embodiment mentioned above.
(First embodiment)
In this example, as shown in FIG. 1B and FIG. 3B as the first embodiment of the present invention, the heat sink 4 is sandwiched between the separators 7, and the heat sink 4 is the side 9c of the laminate film 1, A flat laminate film secondary battery having a structure extending from both sides of 9d was produced.

正極体５は、リチウムイオンを吸蔵・放出するリチウムイオン含有金属酸化物のリチウムマンガン複合酸化物を正極活物質５ａとして、塗布領域６５ｍｍ×１２０ｍｍ、厚さ７０μｍ程度とし、２０μｍ厚のアルミ箔シート５ｂの両面に塗布したものを用いた。   The positive electrode body 5 includes a lithium manganese composite oxide of a lithium ion-containing metal oxide that occludes / releases lithium ions as a positive electrode active material 5a, an application area of 65 mm × 120 mm, a thickness of about 70 μm, and a 20 μm thick aluminum foil sheet 5b. What was apply | coated to both surfaces of was used.

負極体６は、リチウムイオンを吸蔵・放出するハードカーボン系の負極活物質６ａを、塗布領域７０ｍｍ×１２５ｍｍ、厚さ５０μｍ程度で、１０μｍ厚の銅箔シート６ｂに両面塗布したものを用いた。   As the negative electrode body 6, a hard carbon negative electrode active material 6a that occludes and releases lithium ions was applied on both sides of a 10 μm thick copper foil sheet 6b with a coating area of 70 mm × 125 mm and a thickness of about 50 μm.

セパレータ７としては、寸法７５ｍｍ×１３０ｍｍ、２５μｍ厚の多孔性絶縁樹脂薄膜シートであるポリエチレンフィルムとポリプロピレンフィルムの積層型セパレータを用いた。   As the separator 7, a laminated separator of a polyethylene film and a polypropylene film, which is a porous insulating resin thin film sheet having dimensions of 75 mm × 130 mm and a thickness of 25 μm, was used.

放熱板４としては、１００μｍ厚、寸法ａ×ｄは３０ｍｍ×１１５ｍｍの平板形状でニッケルメッキが施された銅板を用い、延出部４ａ、４ｂの寸法ａ×ｃは３０ｍｍ×５ｍｍとした。   As the heat sink 4, a copper plate having a thickness of 100 μm and a plate shape of 30 mm × 115 mm and nickel plating was used, and the dimensions a × c of the extended portions 4 a and 4 b were 30 mm × 5 mm.

正電極端子２は、１００μｍ厚のアルミニウム板を用い、負電極端子３は、１００μｍ厚のニッケル板を用いた。   The positive electrode terminal 2 was a 100 μm thick aluminum plate, and the negative electrode terminal 3 was a 100 μm thick nickel plate.

外装体となるラミネートフィルム９は、外寸ｆ×ｅが、９５ｍｍ×１６０ｍｍ、アルミ箔を主材とする１００μｍ厚程度のものを用いた。このラミネートフィルム９による熱融着の封止幅は１０ｍｍとした。   As the laminate film 9 serving as an exterior body, an outer dimension f × e of 95 mm × 160 mm and a thickness of about 100 μm mainly composed of an aluminum foil was used. The sealing width of heat sealing by the laminate film 9 was 10 mm.

上述の各部材を第１の実施形態で説明した作製方法にて、セパレータ７間に放熱板４を挟持した扁平型ラミネートフィルム二次電池１を作製した。   The flat laminate film secondary battery 1 in which the heat dissipation plate 4 was sandwiched between the separators 7 was manufactured by the manufacturing method described in the first embodiment for each member described above.

まず、正極体５と負極体６とをセパレータ７を介しながら積層して発電要素体８を形成する。次いで、放熱板４を、２枚の隣接するセパレータ７間にて、ラミネートフィルム１で密封した際に延出部４ａ、４ｂが形成されるように位置決めしてから挟持する。次に、正電極端子２および負電極端子３は、正極体５および負極体６にそれぞれ超音波溶接によりそれぞれ取り付ける。   First, the power generation element body 8 is formed by laminating the positive electrode body 5 and the negative electrode body 6 with the separator 7 interposed therebetween. Next, the heat radiating plate 4 is positioned between the two adjacent separators 7 so that the extended portions 4a and 4b are formed when sealed with the laminate film 1, and then sandwiched. Next, the positive electrode terminal 2 and the negative electrode terminal 3 are respectively attached to the positive electrode body 5 and the negative electrode body 6 by ultrasonic welding.

以上のようにして、放熱板４、正電極端子２および負電極端子３を備えた発電要素体８をラミネートフィルム１で包み、内部にプロピレンカーボネートとメチルエチルカーボネートの非水系溶媒に六フッ化リン酸リチウムを溶解させた電解液を注入し、減圧下で熱融着封止を行って図１（ｂ）、図３（ｂ）に示す形態の二次電池を作製した。
（第２の実施例）
本実施例では、本発明の第２の実施形態として示した図４に示す構造を有する扁平型ラミネートフィルム二次電池を作製した。 As described above, the power generation element body 8 including the heat radiating plate 4, the positive electrode terminal 2, and the negative electrode terminal 3 is wrapped with the laminate film 1, and phosphorus hexafluoride is added to the inside of the non-aqueous solvent of propylene carbonate and methyl ethyl carbonate. An electrolytic solution in which lithium acid was dissolved was injected, and heat fusion sealing was performed under reduced pressure to produce a secondary battery having the form shown in FIGS. 1B and 3B.
(Second embodiment)
In this example, a flat laminate film secondary battery having the structure shown in FIG. 4 shown as the second embodiment of the present invention was produced.

すなわち、２組の正極体１５の各正極活物質１５ａが放熱板１４の両面に接触するようにして放熱板１４を挟持し、図１（ｂ）に示したような、ラミネートフィルム１の辺９ｃ、９ｄの両側から放熱板１４を延出させた構造の扁平型ラミネートフィルム二次電池を作製した。なお、各部材の寸法および材質等は、第１の実施例と同様とした。
（第３の実施例）
本実施例では、本発明の第３の実施形態として示した図５に示す構造を有する扁平型ラミネートフィルム二次電池を作製した。 That is, the positive electrode active material 15a of the two sets of positive electrode bodies 15 sandwiches the heat radiating plate 14 so as to be in contact with both surfaces of the heat radiating plate 14, and the side 9c of the laminate film 1 as shown in FIG. A flat laminate film secondary battery having a structure in which the heat sink 14 is extended from both sides of 9d. The dimensions and materials of each member were the same as in the first example.
(Third embodiment)
In this example, a flat laminate film secondary battery having the structure shown in FIG. 5 shown as the third embodiment of the present invention was produced.

すなわち、２枚の隣接する正極体２５を正極活物質２５ａが塗布されていないアルミ箔シート２５ｂの面２５ｂ’が向かい合うようにして配置し、各アルミ箔シート２５ｂが放熱板２４に接触するようにして放熱板２４を挟み込み、図１（ｂ）に示したような、ラミネートフィルム１の辺９ｃ、９ｄの両側から放熱板２４を延出させた構造の扁平型ラミネートフィルム二次電池を作製した。なお、各部材の寸法および材質等は、第１の実施例と同様とした。
（第４の実施例）
本実施例では、本発明の第４の実施形態として示した図６に示す構造を有する扁平型ラミネートフィルム二次電池を作製した。 That is, two adjacent positive electrode bodies 25 are arranged so that the surface 25b ′ of the aluminum foil sheet 25b not coated with the positive electrode active material 25a faces each other, and each aluminum foil sheet 25b is in contact with the heat radiating plate 24. Then, a flat laminate film secondary battery having a structure in which the heat sink 24 was extended from both sides of the sides 9c and 9d of the laminate film 1 as shown in FIG. The dimensions and materials of each member were the same as in the first example.
(Fourth embodiment)
In this example, a flat laminate film secondary battery having the structure shown in FIG. 6 shown as the fourth embodiment of the present invention was produced.

すなわち、放熱板３４は、放熱部３４ｆと、分岐部３４ｅで二股に分岐した第１の吸熱部３４ｃおよび第２の吸熱部３４ｄとを有し、第１の吸熱部３４ｃおよび第２の吸熱部３４ｄにより発電要素体３８を挟持し、図１（ｂ）に示したような、ラミネートフィルム１の辺９ｃ、９ｄの両側から放熱部３４ｆを延出させた構造の扁平型ラミネートフィルム二次電池を作製した。   In other words, the heat radiating plate 34 includes a heat radiating portion 34f and a first heat absorbing portion 34c and a second heat absorbing portion 34d that are bifurcated by a branching portion 34e, and the first heat absorbing portion 34c and the second heat absorbing portion. A flat laminated film secondary battery having a structure in which the heat generating element 38 is sandwiched between the sides 9c and 9d of the laminate film 1 as shown in FIG. Produced.

第１の吸熱部３４ｃおよび第２の吸熱部３４ｄの寸法は、８０ｍｍ×１３０ｍｍであり、図１（ｂ）に示す延出部４ａ、４ｂとなる部分の寸法ａ×ｃは３０ｍｍ×２０ｍｍとした。なお、その他の各部材の寸法および材質等は、第１の実施例と同様とした。
（比較例）
上述の各実施例との比較のため、放熱板を備えていない、各部材の寸法および材質等が第１の実施例と同様の、図８に示す扁平型ラミネートフィルム二次電池を作製した。
（第１の比較評価）
以上の本発明の第１〜第４の実施例の扁平型ラミネートフィルム二次電池、および比較例で作製した扁平型ラミネートフィルム二次電池を用いて、満充電から１０Ｃ、２０ＣでＳＯＣ０％まで完全放電試験を行った。その際の発熱温度ΔＴ（℃）をセル中央部にて測定した。表１に比較結果を示す。 The dimensions of the first endothermic part 34c and the second endothermic part 34d are 80 mm × 130 mm, and the dimension a × c of the portions to be the extension parts 4a and 4b shown in FIG. 1B is 30 mm × 20 mm. . The dimensions and materials of the other members were the same as in the first example.
(Comparative example)
For comparison with each of the above-described examples, a flat laminate film secondary battery shown in FIG. 8 having no heat sink and having the same dimensions and materials as those of the first example was prepared.
(First comparative evaluation)
Using the flat laminate film secondary battery of the first to fourth embodiments of the present invention described above and the flat laminate film secondary battery produced in the comparative example, the SOC is fully charged from 10 C to 20 C at SOC of 0%. A discharge test was conducted. The exothermic temperature ΔT (° C.) at that time was measured at the center of the cell. Table 1 shows the comparison results.

Figure 2005056655
Figure 2005056655

表１に示すように、第１〜第４の実施例のいずれも、比較例に比べて、完全放電時における発熱温度ΔＴ（℃）を低く抑えることができた。
（第２の比較評価）
第４の実施例の扁平型ラミネートフィルム二次電池を１０個作製し、これらを図７に示した構成の組電池５０にしたものと、第１の比較の扁平型ラミネートフィルム二次電池を１０個作製し、これらを図９に示す構成の組電池１５０にしたものとについて、以下の条件で振動試験を行った。 As shown in Table 1, in all of the first to fourth examples, the heat generation temperature ΔT (° C.) at the time of complete discharge could be kept lower than that of the comparative example.
(Second comparative evaluation)
Ten flat laminate film secondary batteries of the fourth embodiment were produced, and these were used as the assembled battery 50 having the configuration shown in FIG. 7 and 10 flat laminate film secondary batteries of the first comparison. A vibration test was performed on the battery pack 150 that was manufactured individually and made into the assembled battery 150 having the configuration shown in FIG. 9 under the following conditions.

各組電池５０、１５０に印加する振動は、振幅０．８ｍｍ、３０Ｈｚの単振動であり、図７、図９に示すＸ軸方向、Ｙ軸方向およびＺ軸方向の各軸方向にそれぞれ２４０分間印加した。振動試験終了後、各組電池５０、１５０の充放電を行い、評価前後の容量変化を測定した。表２に比較結果を示す。   The vibration applied to each of the assembled batteries 50 and 150 is a simple vibration with an amplitude of 0.8 mm and 30 Hz, and 240 minutes in each of the X-axis direction, the Y-axis direction, and the Z-axis direction shown in FIGS. Applied. After completion of the vibration test, the assembled batteries 50 and 150 were charged and discharged, and the change in capacity before and after the evaluation was measured. Table 2 shows the comparison results.

Figure 2005056655
Figure 2005056655

第１の吸熱部３４ｃおよび第２の吸熱部３４ｄにより発電要素体３８を挟持した構造の第４の実施例の扁平型ラミネートフィルム二次電池の組電池５０は、比較例による組電池１５０に比べて、振動が印加された後においても容量の低下を抑制することができた。   The assembled battery 50 of the flat laminated film secondary battery of the fourth embodiment having a structure in which the power generation element body 38 is sandwiched between the first heat absorbing portion 34c and the second heat absorbing portion 34d is compared with the assembled battery 150 according to the comparative example. Thus, the decrease in capacity can be suppressed even after the vibration is applied.

本発明の第１の実施形態における扁平型ラミネートフィルム二次電池の模式的な平面図である。1 is a schematic plan view of a flat laminate film secondary battery according to a first embodiment of the present invention. 発電要素体の構造を示す模式図である。It is a schematic diagram which shows the structure of an electric power generation element body. 本発明の第１の実施形態における扁平型ラミネートフィルム二次電池の発電要素体の構造を説明するための模式図である。It is a schematic diagram for demonstrating the structure of the electric power generation element body of the flat type laminate film secondary battery in the 1st Embodiment of this invention. 本発明の第２の実施形態における扁平型ラミネートフィルム二次電池の発電要素体の構造を説明するための模式図である。It is a schematic diagram for demonstrating the structure of the electric power generation element body of the flat laminate film secondary battery in the 2nd Embodiment of this invention. 本発明の第３の実施形態における扁平型ラミネートフィルム二次電池の発電要素体の構造を説明するための模式図である。It is a schematic diagram for demonstrating the structure of the electric power generation element body of the flat laminate film secondary battery in the 3rd Embodiment of this invention. 本発明の第４の実施形態における扁平型ラミネートフィルム二次電池の発電要素体の構造を説明するための模式図である。It is a schematic diagram for demonstrating the structure of the electric power generation element body of the flat laminate film secondary battery in the 4th Embodiment of this invention. 本発明の第４の実施形態における扁平型ラミネートフィルム二次電池を用いた組電池の外観斜視図である。It is an external appearance perspective view of the assembled battery using the flat type laminate film secondary battery in the 4th Embodiment of this invention. 放熱板を備えていない、比較例としての扁平型ラミネートフィルム二次電池の模式的な平面図である。It is a typical top view of the flat laminate film secondary battery as a comparative example which is not provided with a heat sink. 図８に示した扁平型ラミネートフィルム二次電池を用いた組電池の一例の外観斜視図である。It is an external appearance perspective view of an example of the assembled battery using the flat laminate film secondary battery shown in FIG.

符号の説明Explanation of symbols

１、１００ 扁平型ラミネートフィルム二次電池
２ 正電極端子
３ 負電極端子
４、１４、２４、３４ 放熱板
４ａ、４ｂ 延出部
５、５’、１５、２５ 正極体
５ａ、１５ａ、２５ａ 正極活物質
５ｂ、１５ａ、２５ａ アルミ箔シート
６、６’１６、 負極体
６ａ、１６ａ 負極活物質
６ｂ、１６ｂ 銅箔シート
７、７’１７、３７ａ、３７ｂ セパレータ
８、１８、２８、３８ 発電要素体
９、３９ ラミネートフィルム
９ａ、９ｂ、９ｃ、９ｄ、３９ｃ 辺
９ｅ 領域
２５ｂ’ 面
３４ｃ 第１の放熱部
３４ｄ 第２の放熱部
３４ｅ 分岐部
３４ｆ 放熱部
５０、１５０ 組電池 DESCRIPTION OF SYMBOLS 1,100 Flat type laminated film secondary battery 2 Positive electrode terminal 3 Negative electrode terminal 4, 14, 24, 34 Heat sink 4a, 4b Extension part 5, 5 ', 15, 25 Positive electrode body 5a, 15a, 25a Positive electrode active Substance 5b, 15a, 25a Aluminum foil sheet 6, 6'16, Negative electrode body 6a, 16a Negative electrode active material 6b, 16b Copper foil sheet 7, 7'17, 37a, 37b Separator 8, 18, 28, 38 Power generation element body 9 , 39 Laminate film 9a, 9b, 9c, 9d, 39c Side 9e Region 25b 'surface 34c First heat radiating portion 34d Second heat radiating portion 34e Branching portion 34f Heat radiating portion 50, 150 Battery pack

Claims (9)

活物質が塗布された極板を有する複数の電極体と複数のセパレータとを積層してなる発電要素体と、前記発電要素体を被覆する、可塑性を有し、前記電極体に電気的に接触している電極端子が延出している辺を含む外装材とを有する扁平型二次電池において、
前記発電要素体に対して伝熱可能に接触している少なくとも１つの放熱用部材を有し、前記放熱用部材が、前記外装材の、前記電極端子が延出していない辺から延出していることを特徴とする扁平型二次電池。 A power generation element body formed by laminating a plurality of electrode bodies each having an electrode plate coated with an active material and a plurality of separators, and covering the power generation element body, having plasticity, and being in electrical contact with the electrode body In the flat type secondary battery having an exterior material including a side where the electrode terminal is extended,
It has at least one heat radiating member in contact with the power generating element body so that heat can be transferred, and the heat radiating member extends from a side of the exterior material where the electrode terminal does not extend. A flat secondary battery characterized by the above. 前記放熱用部材が、前記セパレータに伝熱可能に接触している請求項１に記載の扁平型二次電池。   The flat secondary battery according to claim 1, wherein the heat dissipating member is in contact with the separator so that heat can be transferred. 前記放熱用部材が、前記極板に伝熱可能に接触している請求項１または２に記載の扁平型二次電池。   The flat secondary battery according to claim 1, wherein the heat radiating member is in contact with the electrode plate so that heat can be transferred. 前記放熱用部材が、前記活物質に伝熱可能に接触している請求項１ないし３のいずれか１項に記載の扁平型二次電池。   The flat secondary battery according to any one of claims 1 to 3, wherein the heat radiating member is in contact with the active material so that heat can be transferred. 前記放熱用部材が、隣接する前記セパレータの間、隣接する前記活物質の間、および隣接する前記極板の間のいずれかに挟持されている請求項１ないし４のいずれか１項に記載の扁平型二次電池。   5. The flat mold according to claim 1, wherein the heat dissipating member is sandwiched between adjacent separators, adjacent active materials, and adjacent electrode plates. 6. Secondary battery. 前記放熱用部材が、前記発電要素体を挟持して伝熱可能に接触している、請求項１ないし３のいずれか１項に記載の扁平型二次電池。   4. The flat secondary battery according to claim 1, wherein the heat dissipating member is in contact with the power generation element body so as to transfer heat. 5. 前記放熱用部材が、金属板からなる請求項１ないし６のいずれか１項に記載の扁平型二次電池。   The flat secondary battery according to claim 1, wherein the heat dissipating member is made of a metal plate. 活物質が塗布された極板を有する電極体とセパレータとを積層してなる発電要素体と、前記電極体に電気的に接続されている電極端子と、前記発電要素体を被覆する可塑性を有する外装材とを有する扁平型二次電池の前記各電極端子を電気的に接続してなる組電池において、
前記扁平型二次電池が、請求項１ないし６のいずれか１項に記載の扁平型二次電池であることを特徴とする組電池。 A power generation element body formed by laminating an electrode body having an electrode plate coated with an active material and a separator, an electrode terminal electrically connected to the electrode body, and a plasticity that covers the power generation element body In an assembled battery formed by electrically connecting the electrode terminals of a flat secondary battery having an exterior material,
The assembled battery, wherein the flat secondary battery is the flat secondary battery according to any one of claims 1 to 6. 活物質が塗布された極板を有する電極体とセパレータとを積層してなる発電要素体と、前記電極体に電気的に接続されている電極端子と、前記発電要素体を被覆する可塑性を有する外装材とを有する扁平型二次電池の前記各電極端子を電気的に接続してなる組電池において、
前記扁平型二次電池が、請求項７に記載の扁平型二次電池であり、前記各扁平型二次電池が前記各放熱用部材を互いに接合して固定保持されていることを特徴とする組電池。 A power generation element body formed by laminating an electrode body having an electrode plate coated with an active material and a separator, an electrode terminal electrically connected to the electrode body, and a plasticity that covers the power generation element body In an assembled battery formed by electrically connecting the electrode terminals of a flat secondary battery having an exterior material,
The flat secondary battery is the flat secondary battery according to claim 7, wherein the flat secondary batteries are fixedly held by joining the heat-dissipating members to each other. Assembled battery.
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