JPWO2011061931A1 - Power storage device - Google Patents

Power storage device Download PDF

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JPWO2011061931A1
JPWO2011061931A1 JP2011541811A JP2011541811A JPWO2011061931A1 JP WO2011061931 A1 JPWO2011061931 A1 JP WO2011061931A1 JP 2011541811 A JP2011541811 A JP 2011541811A JP 2011541811 A JP2011541811 A JP 2011541811A JP WO2011061931 A1 JPWO2011061931 A1 JP WO2011061931A1
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power storage
heat radiating
radiating plate
groove portion
storage device
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JP5529164B2 (en
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阿久津　進
進 阿久津
木村　正良
正良 木村
柴田　和己
和己 柴田
智宏 塚本
智宏 塚本
崇史 冨永
崇史 冨永
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Honda Motor Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/0003—Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/14—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors
    • H01G11/18—Arrangements or processes for adjusting or protecting hybrid or EDL capacitors against thermal overloads, e.g. heating, cooling or ventilating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/80—Gaskets; Sealings
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H01M10/6555—Rods or plates arranged between the cells
    • 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
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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

Abstract

必要以上に大型することなく、十分な放熱効果を得ることが可能な蓄電装置を提供すること。平板状の蓄電セル２０、２０を複数積層して外装ケース１１に収容した蓄電装置１０において、蓄電セル２０を、この蓄電セル２０よりも大きい一対の第一放熱板３１及び第二放熱板３２でそれぞれ挟持するとともに、外装ケース１１の内面に、第一放熱板３１及び第二放熱板３２がそれぞれ差し込まれる深溝部１７及び浅溝部１６を形成し、これら深溝部１７及び浅溝部１６には、第一放熱板３１及び第二放熱板３２と外装ケース１１との間に熱伝導性を有する樹脂材１９を充填したことを特徴とする。To provide a power storage device capable of obtaining a sufficient heat dissipation effect without being larger than necessary. In the power storage device 10 in which a plurality of flat storage cells 20, 20 are stacked and accommodated in the outer case 11, the storage cell 20 is composed of a pair of first heat radiating plate 31 and second heat radiating plate 32 that are larger than the power storage cell 20. The deep groove portion 17 and the shallow groove portion 16 into which the first heat radiating plate 31 and the second heat radiating plate 32 are respectively inserted are formed on the inner surface of the outer case 11. A resin material 19 having thermal conductivity is filled between the one heat radiating plate 31 and the second heat radiating plate 32 and the outer case 11.

Description

本発明は、平板状の蓄電セルを複数積層して形成された蓄電装置に関する。   The present invention relates to a power storage device formed by stacking a plurality of flat storage cells.

一般に、電動車両等に搭載される蓄電装置として、フィルム材の周縁部を封止して平板状の蓄電セル（例えば、リチウムイオン二次電池等）を複数積層して外装ケースに収容したものが知られている。この種の蓄電装置では、蓄電セルの温度が上昇すると劣化を招いてしまう。このため、従来、温度上昇を抑える冷却構造として、積層される複数の蓄電セル間に放熱板を挟み込むことにより、蓄電セルの熱を放熱板から外気に放出し、蓄電セル温度の過度な上昇を抑制するようにしたものが提案されている。(例えば、特許文献１参照)。また、外装ケース内に樹脂材を充填し、樹脂材によって個々の蓄電セルを覆うことにより、外部からの熱や蓄電セルの熱を樹脂材に吸収させる構造が提案されている。(例えば、特許文献２参照)。さらに、金属板からなる放熱板を挟み込んだ状態で複数の蓄電セルを積層し、金属板の側面をペルチェ素子に接触させることにより蓄電セルを冷却させる構造が提案されている。(例えば、特許文献３参照)。   In general, as a power storage device mounted on an electric vehicle or the like, a device in which a peripheral portion of a film material is sealed and a plurality of flat storage cells (for example, lithium ion secondary batteries) are stacked and accommodated in an outer case. Are known. In this type of power storage device, deterioration occurs when the temperature of the power storage cell increases. For this reason, conventionally, as a cooling structure that suppresses the rise in temperature, by sandwiching a heat sink between a plurality of stacked power storage cells, the heat of the power storage cell is released from the heat sink to the outside air, and the power storage cell temperature is excessively increased. What has been suppressed is proposed. (For example, refer to Patent Document 1). In addition, a structure has been proposed in which a resin material is filled in an outer case, and each power storage cell is covered with the resin material so that heat from the outside or heat of the power storage cell is absorbed by the resin material. (For example, refer to Patent Document 2). Further, a structure has been proposed in which a plurality of power storage cells are stacked with a heat dissipation plate made of a metal plate sandwiched therebetween, and the side surfaces of the metal plate are brought into contact with a Peltier element to cool the power storage cell. (For example, refer to Patent Document 3).

特開２００４−３１２８１号公報Japanese Patent Laid-Open No. 2004-3281 特開２００８−３００６９２号公報JP 2008-300692 A 特開２００５−２２２６９９号公報JP 2005-222699 A

しかし、特許文献１に記載されたものでは、放熱板を外装ケースの外部に突出させる構造となっており、蓄電装置が大型化してしまう。また、特許文献２に記載されたものでは、充填された樹脂材に蓄電セルの熱を吸収させるため、外装ケース内に樹脂材を注入する大きな空間が必要であり、外装ケース、すなわち蓄電装置が大型化する。更に、この特許文献２に記載のものでは、樹脂材に吸収された熱を大気に放出する放熱部材を蓄電装置の端部に設けているため、蓄電セル間の温度差や温度勾配が生じ、例えば、リチウムイオン電池を使用する場合には、温度勾配の発生により電池の出力容量が低下するといった問題がある。
また、特許文献３に記載されたものでは、ペルチェ素子を使用するため、電力消費が発生することに加え、装置構成が煩雑になり蓄電装置の大型化、高コスト化を招くといった問題がある。However, the one described in Patent Document 1 has a structure in which the heat radiating plate protrudes to the outside of the exterior case, and the power storage device is increased in size. Moreover, in what was described in patent document 2, in order for the resin material with which it was filled to absorb the heat | fever of an electrical storage cell, the large space which inject | pours a resin material into an exterior case is required, and an exterior case, ie, an electrical storage apparatus, Increase in size. Furthermore, in the thing of this patent document 2, since the thermal radiation member which discharge | releases the heat | fever absorbed by the resin material to air | atmosphere is provided in the edge part of an electrical storage apparatus, the temperature difference and temperature gradient between electrical storage cells arise, For example, when using a lithium ion battery, there exists a problem that the output capacity of a battery falls by generation | occurrence | production of a temperature gradient.
In addition, since the Peltier element is used in the device described in Patent Document 3, there is a problem that, in addition to power consumption, the device configuration is complicated and the power storage device is increased in size and cost.

そこで、本発明は、上述した事情に鑑みてなされたものであり、必要以上に大型することなく、十分な放熱効果を得ることが可能な蓄電装置を提供することを目的とする。   Therefore, the present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a power storage device that can obtain a sufficient heat dissipation effect without being unnecessarily large.

ところで、この種の蓄電装置では、例えば、電池を誤使用等した場合に、電解液や活物質の分解により蓄電セルのフィルム材内でガスが発生し、このガスがフィルム材内に蓄積されることがある。この場合、フィルム材は周囲を接着等によって封止されているため、このままでは蓄積されたガスが排出されず内圧が上昇する。このガスを排出するための安全弁を設けることも考えられるが構成が煩雑となる問題がある。   By the way, in this type of power storage device, for example, when the battery is misused, gas is generated in the film material of the power storage cell due to decomposition of the electrolytic solution and the active material, and this gas is accumulated in the film material. Sometimes. In this case, since the periphery of the film material is sealed by adhesion or the like, the accumulated gas is not discharged without increasing the internal pressure. Although it is conceivable to provide a safety valve for discharging this gas, there is a problem that the configuration becomes complicated.

そこで、本発明は、上述した事情に鑑みてなされたものであり、簡単な構成で蓄電セル内の内圧の上昇を解消することができる蓄電装置を提供することを目的とする。   Therefore, the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a power storage device that can eliminate an increase in internal pressure in a power storage cell with a simple configuration.

上述課題を解決するため、本発明は、平板状の蓄電セルを複数積層して外装ケースに収容した蓄電装置において、前記蓄電セルを、この蓄電セルよりも大きい一対の放熱板で挟持するとともに、前記外装ケースの内面に、前記放熱板が差し込まれる溝部を形成し、この溝部には、前記放熱板と前記外装ケースとの間に熱伝導性を有する樹脂材を充填したことを特徴とする。   In order to solve the above-described problem, the present invention is a power storage device in which a plurality of flat storage cells are stacked and accommodated in an outer case, and the storage cells are sandwiched between a pair of heat dissipation plates larger than the storage cells, A groove portion into which the heat radiating plate is inserted is formed on the inner surface of the outer case, and the groove portion is filled with a resin material having thermal conductivity between the heat radiating plate and the outer case.

この構成によれば、蓄電セルを、この蓄電セルよりも大きい一対の放熱板で挟持するとともに、外装ケースの内面に、放熱板が差し込まれる溝部を形成し、この溝部には、放熱板と外装ケースとの間に熱伝導性を有する樹脂材を充填したため、蓄電セルで発生した熱を放熱板及び樹脂材を介して、外装ケースに伝達することができ、蓄電セルを効果的に冷却することができる。また、外装ケースの内面に放熱板が差し込まれる溝部を形成し、この溝部に樹脂材を充填しているため、外装ケースと樹脂材との接触面積を大きく確保することができ、外装ケースの大型化を防止できる。   According to this configuration, the power storage cell is sandwiched between a pair of heat dissipation plates larger than the power storage cell, and a groove portion into which the heat dissipation plate is inserted is formed on the inner surface of the exterior case. Since the resin material having thermal conductivity is filled with the case, the heat generated in the storage cell can be transferred to the outer case through the heat sink and the resin material, and the storage cell is effectively cooled. Can do. In addition, since the groove portion into which the heat sink is inserted is formed on the inner surface of the outer case, and the groove portion is filled with the resin material, a large contact area between the outer case and the resin material can be secured, and the outer case has a large size. Can be prevented.

この構成において、前記一対の放熱板は、第一放熱板とこの第一放熱板よりも小さい第二放熱板とを備え、前記外装ケースの内面には、前記第二放熱板が差し込まれる浅溝部と、この浅溝部よりも深く形成され、前記第一放熱板が差し込まれる深溝部とが交互に形成されている構成としても良い。この構成によれば、浅溝部及び深溝部の深さに適合するように第一放熱板及び第二放熱板を差し込むことにより、蓄電セルの組み付けを容易にすることができ、誤って組み付けることを防止できる。   In this configuration, the pair of heat radiating plates includes a first heat radiating plate and a second heat radiating plate smaller than the first heat radiating plate, and a shallow groove portion into which the second heat radiating plate is inserted on the inner surface of the exterior case. And it is good also as a structure formed deeper than this shallow groove part, and the deep groove part in which said 1st heat sink is inserted alternately. According to this configuration, by inserting the first heat radiating plate and the second heat radiating plate so as to conform to the depth of the shallow groove portion and the deep groove portion, it is possible to facilitate the assembly of the storage cell, and to assemble it incorrectly. Can be prevented.

また、前記深溝部と前記浅溝部との幅の比を、前記深溝部に対向する第一放熱板の面積と、前記浅溝部に対向する第二放熱板の面積との比と略同一とした構成としても良い。この構成によれば、浅溝部及び深溝部における樹脂材の熱抵抗を略同一とすることができ、各蓄電セル間の温度差や温度勾配を抑制することができるため、蓄電装置の出力容量の低下を防止できる。   Further, the ratio of the width of the deep groove portion to the shallow groove portion is substantially the same as the ratio of the area of the first heat radiating plate facing the deep groove portion and the area of the second heat radiating plate facing the shallow groove portion. It is good also as a structure. According to this configuration, the thermal resistance of the resin material in the shallow groove portion and the deep groove portion can be made substantially the same, and a temperature difference and a temperature gradient between the storage cells can be suppressed. Decline can be prevented.

また、上述課題を解決するため、本発明は、フィルム材の周縁部を封止して平板状に形成された複数の蓄電セルを備え、これら蓄電セルを積層して外装ケースに収容した蓄電装置において、前記蓄電セルをそれぞれ一対の放熱板で挟持し、これら放熱板の間に硬化性樹脂材を配置して前記フィルム材の周縁部の一部を除く他の部分を保持するとともに、前記周縁部の一部に対応する前記放熱板間に通気性を有する発泡弾性体を介装して当該周縁部の一部を保持したことを特徴とする。
この構成によれば、硬化性樹脂材よりも発泡弾性材の方が、フィルム材の周縁部を固定する力が弱いため、フィルム材内の内圧が上昇した場合には、この内圧によって発泡樹脂材が変形し、当該発泡樹脂材を通して蓄電セル内で発生したガスを外部に解放することができるため、簡単な構成で信頼性の高い蓄電装置を得ることができる。In order to solve the above-mentioned problem, the present invention includes a plurality of power storage cells formed in a flat plate shape by sealing a peripheral portion of a film material, and a power storage device in which these power storage cells are stacked and accommodated in an outer case In this case, each of the electricity storage cells is sandwiched between a pair of heat sinks, a curable resin material is disposed between the heat sinks, and the other part of the film material excluding a part of the peripheral part is held. A part of the peripheral edge is held by interposing a foamed elastic body having air permeability between the heat radiating plates corresponding to a part.
According to this configuration, the foamed elastic material is weaker than the curable resin material in fixing the peripheral edge of the film material. Since the gas generated in the electricity storage cell can be released to the outside through the foamed resin material, a highly reliable electricity storage device can be obtained with a simple configuration.

この構成において、前記放熱板には、前記フィルム材の周縁部の一部に対向する位置に通気孔が形成され、この通気孔は、隣接する他の放熱板の通気孔を介して、外装ケースに設けられた孔部に連通している構成としても良い。この構成によれば、蓄電セル内で発生したガスを、放熱板の通気孔を通じて速やかに外装ケースの外部に排出することができる。   In this configuration, the heat radiating plate is formed with a vent hole at a position facing a part of the peripheral edge of the film material, and the vent hole is formed through the vent hole of another adjacent radiating plate. It is good also as a structure connected to the hole provided in. According to this configuration, the gas generated in the storage cell can be quickly discharged out of the outer case through the vent hole of the heat sink.

また、前記フィルム材の周縁部の一部は、側面視で前記通気孔とオーバーラップするように配置されている構成としても良い。特に、周縁部の一部を通気孔の略半分の高さ位置に配置することにより、発泡弾性体による封止力の大きさと、通気孔の通気開口の確保との両立を図ることができる。   Moreover, it is good also as a structure arrange | positioned so that a part of peripheral part of the said film material may overlap with the said air vent in a side view. In particular, by arranging a part of the peripheral edge at a height position that is substantially half of the vent hole, it is possible to achieve both the magnitude of the sealing force by the foamed elastic body and the securing of the vent opening of the vent hole.

また、前記蓄電セルは、正極タブ及び負極タブを備え、前記発泡弾性体は前記正極タブ及び負極タブと並べて配置される構成としても良い。この構成によれば、発泡弾性体が、正極タブ及び負極タブへの接続作業を邪魔することはなく、さらに、蓄電セルが必要以上に大きくなることが防止されるため、蓄電装置の小型化を図ることができる。   The power storage cell may include a positive electrode tab and a negative electrode tab, and the foamed elastic body may be arranged side by side with the positive electrode tab and the negative electrode tab. According to this configuration, the foamed elastic body does not interfere with the connection work to the positive electrode tab and the negative electrode tab, and further, the storage cell is prevented from becoming unnecessarily large. Can be planned.

本発明によれば、蓄電セルを、この蓄電セルよりも大きい一対の放熱板で挟持するとともに、外装ケースの内面に、放熱板が差し込まれる溝部を形成し、この溝部には、放熱板と外装ケースとの間に熱伝導性を有する樹脂材を充填したため、蓄電セルで発生した熱を放熱板及び樹脂材を介して、外装ケースに伝達することができ、蓄電セルを効果的に冷却することができる。また、外装ケースの内面に放熱板が差し込まれる溝部を形成し、この溝部に樹脂材を充填しているため、外装ケースと樹脂材との接触面積を大きく確保することができ、外装ケースの大型化を防止できる。
また、本発明によれば、一対の放熱板は、第一放熱板とこの第一放熱板よりも小さい第二放熱板とを備え、前記外装ケースの内面には、前記第二放熱板が差し込まれる浅溝部と、この浅溝部よりも深く形成され、前記第一放熱板が差し込まれる深溝部とが交互に形成されているため、浅溝部及び深溝部の深さに適合するように第一放熱板及び第二放熱板を差し込むことにより、蓄電セルの組み付けを容易にすることができ、誤って組み付けることを防止できる。
また、本発明によれば、深溝部と浅溝部との幅の比を、深溝部に対向する第一放熱板の面積と、浅溝部に対向する第二放熱板の面積との比と略同一としたため、浅溝部及び深溝部における樹脂材の熱抵抗を略同一とすることができ、各蓄電セル間の温度差や温度勾配を抑制することができるため、蓄電装置の出力容量の低下を防止できる。According to the present invention, the energy storage cell is sandwiched between a pair of heat dissipation plates larger than the energy storage cell, and a groove portion into which the heat dissipation plate is inserted is formed on the inner surface of the exterior case. Since the resin material having thermal conductivity is filled with the case, the heat generated in the storage cell can be transferred to the outer case through the heat sink and the resin material, and the storage cell is effectively cooled. Can do. In addition, since the groove portion into which the heat sink is inserted is formed on the inner surface of the outer case, and the groove portion is filled with the resin material, a large contact area between the outer case and the resin material can be secured, and the outer case has a large size. Can be prevented.
According to the present invention, the pair of heat sinks includes a first heat sink and a second heat sink smaller than the first heat sink, and the second heat sink is inserted into the inner surface of the exterior case. Since the shallow groove portion and the deep groove portion formed deeper than the shallow groove portion and into which the first heat radiating plate is inserted are alternately formed, the first heat dissipation is adapted to the depth of the shallow groove portion and the deep groove portion. By inserting the plate and the second heat radiating plate, it is possible to facilitate the assembly of the storage cell, and to prevent the erroneous assembly.
Further, according to the present invention, the ratio of the width of the deep groove portion to the shallow groove portion is substantially the same as the ratio of the area of the first heat radiating plate facing the deep groove portion and the area of the second heat radiating plate facing the shallow groove portion. Therefore, the thermal resistance of the resin material in the shallow groove portion and the deep groove portion can be made substantially the same, and the temperature difference and temperature gradient between the respective storage cells can be suppressed, thereby preventing the output capacity of the power storage device from decreasing. it can.

本発明によれば、フィルム材の周縁部を封止して平板状に形成された複数の蓄電セルを備え、これら蓄電セルを積層して外装ケースに収容した蓄電装置において、前記蓄電セルをそれぞれ一対の放熱板で挟持し、これら放熱板の間に硬化性樹脂材を配置して前記フィルム材の周縁部の一部を除く他の部分を保持するとともに、前記周縁部の一部に対応する前記放熱板間に通気性を有する発泡弾性体を介装して当該周縁部の一部を保持したため、フィルム材内の内圧が上昇した場合には、この内圧によって発泡樹脂材が変形し、当該発泡樹脂材を通して蓄電セル内で発生したガスを外部に解放することができるため、簡単な構成で信頼性の高い蓄電装置を得ることができる。
また、本発明によれば、放熱板には、周縁部の一部に対向する位置に通気孔が形成され、この通気孔は、隣接する他の放熱板の通気孔を介して、外装ケースに設けられた孔部に連通しているため、蓄電セル内で発生したガスを、放熱板の通気孔を通じて速やかに外装ケースの外部に排出することができる。
また、本発明によれば、蓄電セルは、正極タブ及び負極タブを備え、発泡弾性体は正極タブ及び負極タブと並べて配置されるため、発泡弾性体が、正極タブ及び負極タブへの接続作業を邪魔することはなく、さらに、蓄電セルが必要以上に大きくなることが防止されるため、蓄電装置の小型化を図ることができる。According to the present invention, in a power storage device that includes a plurality of power storage cells that are formed in a flat plate shape by sealing the peripheral edge of a film material, the power storage cells are stacked and accommodated in an outer case. A pair of heat radiating plates is sandwiched between the heat radiating plates, and a curable resin material is disposed between the heat radiating plates to hold the other part except for a part of the peripheral part of the film material, and the heat dissipation corresponding to a part of the peripheral part. Since a part of the peripheral part is held by interposing a foamed elastic body between the plates, when the internal pressure in the film material rises, the foamed resin material is deformed by the internal pressure, and the foamed resin Since the gas generated in the power storage cell can be released to the outside through the material, a highly reliable power storage device can be obtained with a simple configuration.
Further, according to the present invention, the heat radiating plate is formed with a vent hole at a position facing a part of the peripheral edge, and the vent hole is formed in the outer case via the vent hole of another adjacent radiating plate. Since it communicates with the provided hole, the gas generated in the storage cell can be quickly discharged out of the outer case through the vent hole of the heat sink.
According to the present invention, the storage cell includes the positive electrode tab and the negative electrode tab, and the foamed elastic body is arranged side by side with the positive electrode tab and the negative electrode tab, so that the foamed elastic body is connected to the positive electrode tab and the negative electrode tab. The power storage cell is prevented from becoming unnecessarily large, and the power storage device can be downsized.

本実施形態に係る蓄電装置を示す図であり、図１Ａは蓄電装置の正面図、図１Ｂは蓄電装置の下面図である。It is a figure which shows the electrical storage apparatus which concerns on this embodiment, FIG. 1A is a front view of an electrical storage apparatus, and FIG. 1B is a bottom view of an electrical storage apparatus. 蓄電セルを放熱板とともに示す図であり、図２Ａは蓄電セル及び放熱板の正面図、図２Ｂは図２ＡのＢ−Ｂ断面図、図２Ｃは背面図、図２Ｄは下面図、図２Ｅは、図２ＡのＥ−Ｅ断面図である。FIG. 2A is a front view of the storage cell and the heat sink, FIG. 2B is a cross-sectional view taken along the line BB of FIG. 2A, FIG. 2C is a rear view, FIG. 2D is a bottom view, and FIG. It is EE sectional drawing of FIG. 2A. 蓄電セルの正面図である。It is a front view of an electrical storage cell. 蓄電セルと外装ケースとの組み付け状態を示す図である。It is a figure which shows the assembly | attachment state of an electrical storage cell and an exterior case. 蓄電セルの内圧が解放された際の状態を示す図である。It is a figure which shows the state when the internal pressure of an electrical storage cell is released. 別の実施形態にかかる蓄電装置の正面図である。It is a front view of the electrical storage apparatus concerning another embodiment.

以下、本発明の一実施形態を添付した図面を参照して説明する。図１は、本実施形態に係る蓄電装置を示す図であり、図１Ａは蓄電装置の正面図、図１Ｂは蓄電装置の側面図である。以下の説明中、蓄電装置に関する上下、高さ及び幅といった方向の記載は図１Ａを基準とした方向に従う。
蓄電装置１０は、図１Ａに示すように、外装ケース１１と、この外装ケース１１内に収容される複数（本実施形態では１２個）の蓄電セル２０、２０・・・とを備える。これら複数の蓄電セル２０は、図示しないバスバー等を介して直列に接続されており、モジュール化される蓄電装置１０の高電圧化が図られている。
外装ケース１１は、例えば、アルミニウム等の軽量で熱伝導率の高い金属により、矩形形状に形成されており、正面に複数の蓄電セル２０を収容するための開口１２が形成されている。また、外装ケース１１は、図１Ａ及び図１Ｂに示すように、開口１２の周囲にフランジ１３を備え、このフランジ１３の四隅に形成された孔部１４を介して電動二輪車等の車両に固定される。また、外装ケース１１の上面及び下面には、幅方向の略中央であって、フランジ１３よりも開口１２側に、外装ケース１１の内側と外側とを連通する連通孔１５が形成されている。Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram illustrating a power storage device according to the present embodiment. FIG. 1A is a front view of the power storage device, and FIG. 1B is a side view of the power storage device. In the following description, descriptions of directions such as up and down, height, and width related to the power storage device follow the directions based on FIG. 1A.
As shown in FIG. 1A, the power storage device 10 includes an outer case 11 and a plurality (twelve in this embodiment) of power storage cells 20, 20... Accommodated in the outer case 11. The plurality of power storage cells 20 are connected in series via a bus bar or the like (not shown), so that the voltage of the power storage device 10 to be modularized is increased.
The outer case 11 is formed in a rectangular shape with a light metal having high thermal conductivity, such as aluminum, and an opening 12 for accommodating a plurality of storage cells 20 is formed in the front. Further, as shown in FIGS. 1A and 1B, the outer case 11 includes a flange 13 around the opening 12 and is fixed to a vehicle such as an electric motorcycle through holes 14 formed at four corners of the flange 13. The Further, on the upper and lower surfaces of the outer case 11, a communication hole 15 is formed at the approximate center in the width direction and closer to the opening 12 than the flange 13 to communicate the inner side and the outer side of the outer case 11.

蓄電セル２０は、図２Ａに示すように、大きさの異なる２枚の金属（例えば、アルミニウム）製の第一放熱板３１及び第二放熱板３２で挟持されて構成される。これら第一放熱板３１及び第二放熱板３２は、蓄電セル２０で発生した熱を放熱するためのものであり、蓄電セル２０よりも大きく形成され、第一放熱板３１は、第二放熱板３２よりも大きく形成されている。これにより、蓄電セル２０の周囲には、図２Ｂ、図２Ｄ及び図２Ｅに示すように、第一放熱板３１及び第二放熱板３２により囲まれた空間３５〜３８が形成され、この空間３５〜３８が後述する樹脂材１９が充填される際の流路Ｘとなる。
本構成では、各蓄電セル２０は、図１Ａに示すように、第一放熱板３１、３１同士、第二放熱板３２、３２同士が対向するように、高さ方向（垂直方向）に積層され、これら積層された蓄電セル２０が外装ケース１１内に収容されている。ここで、蓄電セル２０と外装ケース１１との間には弾性部材３４が介装され、蓄電セル２０の位置決めを行っている。この弾性部材３４は、通気性を有する発泡樹脂材であり、本実施形態では、日東電工株式会社製のエプトシーラー（登録商標）が採用されている。As shown in FIG. 2A, the storage cell 20 is configured to be sandwiched between two first and second heat radiating plates 31 and 32 made of two different metals (for example, aluminum). The first heat radiating plate 31 and the second heat radiating plate 32 are for radiating heat generated in the power storage cell 20, and are formed larger than the power storage cell 20, and the first heat radiating plate 31 is a second heat radiating plate. It is formed larger than 32. As a result, as shown in FIGS. 2B, 2D, and 2E, spaces 35 to 38 surrounded by the first heat radiating plate 31 and the second heat radiating plate 32 are formed around the energy storage cell 20. ˜38 becomes the flow path X when the resin material 19 described later is filled.
In this configuration, as shown in FIG. 1A, each storage cell 20 is stacked in the height direction (vertical direction) so that the first heat radiating plates 31, 31 and the second heat radiating plates 32, 32 face each other. These stacked storage cells 20 are accommodated in the outer case 11. Here, an elastic member 34 is interposed between the electricity storage cell 20 and the exterior case 11 to position the electricity storage cell 20. The elastic member 34 is a foamed resin material having air permeability, and in this embodiment, EPT SEALER (registered trademark) manufactured by Nitto Denko Corporation is employed.

外装ケース１１の内面には、深さが異なる浅溝部１６と深溝部１７とが形成されている。深溝部１７は、第一放熱板３１が差し込まれるための溝であり、この第一放熱板３１に対応する深さに形成されている。浅溝部１６は、第二放熱板３２が差し込まれるための溝であり、この第二放熱板３２に対応する深さに形成され、第一放熱板３１を差し込むことができないようになっている。これら浅溝部１６及び深溝部１７は、外装ケース１１の内面に高さ方向に交互に形成されているため、これら溝の深さに適合するように蓄電セル２０、第一放熱板３１及び第二放熱板３２を差し込むことにより、蓄電セル２０の組み付けを容易にすることができ、誤って組み付けることを防止することができる。   A shallow groove portion 16 and a deep groove portion 17 having different depths are formed on the inner surface of the outer case 11. The deep groove portion 17 is a groove into which the first heat radiating plate 31 is inserted, and is formed at a depth corresponding to the first heat radiating plate 31. The shallow groove portion 16 is a groove into which the second heat radiating plate 32 is inserted, and is formed to a depth corresponding to the second heat radiating plate 32 so that the first heat radiating plate 31 cannot be inserted. Since the shallow groove portions 16 and the deep groove portions 17 are alternately formed in the height direction on the inner surface of the outer case 11, the storage cell 20, the first heat dissipation plate 31, and the second heat sink are adapted to match the depth of these grooves. By inserting the heat radiating plate 32, the assembly of the storage cell 20 can be facilitated, and the assembly can be prevented from being mistaken.

また、蓄電装置１０は、外装ケース１１の内面と蓄電セル２０との空隙に熱硬化性を有する樹脂材１９が充填（ポッティング）されている。この樹脂材１９は、第一放熱板３１及び第二放熱板３２と外装ケース１１とを熱的に連結するものであり、熱伝導性の高いものが望ましく、本実施形態ではウレタン樹脂が採用されている。この構成では、蓄電セル２０で発生した熱は、第一放熱板３１及び第二放熱板３２に伝わり、これら第一放熱板３１及び第二放熱板３２から樹脂材１９を介して外装ケース１１に伝熱される。
外装ケース１１は、この外装ケース１１が配置される雰囲気の温度により冷却されるため、蓄電セル２０から外装ケース１１への熱伝導が促進され、蓄電セル２０を効果的に冷却することができる。なお、蓄電装置１０の外装ケース１１を、電動二輪車等の車両における走行風が当たる個所に設けるとより冷却効果を高めることが可能となる。
樹脂材１９の充填は、外装ケース１１の一端側に設けられた浅溝部１６及び深溝部１７から樹脂材１９を供給することにより行われる。この供給された樹脂材１９は、図２Ｂ及び図２Ｄに示すように、第一放熱板３１と第二放熱板３２との間に形成される空間３５〜３７を通じて、蓄電セル２０と外装ケース１１との空隙の隅々にまで充填される。なお、樹脂材１９の粘度が高い場合には、外装ケース１１の他端側を真空引きすることにより、早急に樹脂材１９の充填を行なうことができる。
本構成では、外装ケース１１の内面に各放熱板３１、３２が差し込まれる溝部１６、１７を形成し、この溝部１６、１７に樹脂材１９を充填しているため、外装ケース１１と樹脂材１９との接触面積を大きく確保することができ、外装ケース１１の大型化を防止できる。In the power storage device 10, a resin material 19 having thermosetting properties is filled (potted) in the gap between the inner surface of the outer case 11 and the power storage cell 20. The resin material 19 thermally connects the first heat radiating plate 31 and the second heat radiating plate 32 and the outer case 11, and is preferably a material having high thermal conductivity. In this embodiment, urethane resin is adopted. ing. In this configuration, the heat generated in the electricity storage cell 20 is transmitted to the first heat radiating plate 31 and the second heat radiating plate 32, and from the first heat radiating plate 31 and the second heat radiating plate 32 to the exterior case 11 through the resin material 19. Heat is transferred.
Since the outer case 11 is cooled by the temperature of the atmosphere in which the outer case 11 is disposed, heat conduction from the storage cell 20 to the outer case 11 is promoted, and the storage cell 20 can be effectively cooled. In addition, if the outer case 11 of the power storage device 10 is provided at a location where a traveling wind hits a vehicle such as an electric motorcycle, the cooling effect can be further enhanced.
The resin material 19 is filled by supplying the resin material 19 from the shallow groove portion 16 and the deep groove portion 17 provided on one end side of the outer case 11. As shown in FIGS. 2B and 2D, the supplied resin material 19 passes through the spaces 35 to 37 formed between the first heat radiating plate 31 and the second heat radiating plate 32, and the storage cell 20 and the outer case 11. Fills every corner of the gap. When the viscosity of the resin material 19 is high, the resin material 19 can be quickly filled by evacuating the other end of the outer case 11.
In this configuration, the groove portions 16 and 17 into which the heat dissipation plates 31 and 32 are inserted are formed on the inner surface of the outer case 11, and the groove portions 16 and 17 are filled with the resin material 19. A large contact area can be secured, and an increase in the size of the outer case 11 can be prevented.

蓄電セル２０は、図３に示すように、一対のラミネートフィルム（フィルム材）２１を備え、このラミネートフィルム２１の膨出部２４内には正極タブ２２及び負極タブ２３に接続される電極ユニットと電解液（いずれも不図示）とが収容されている。
このラミネートフィルム２１の周縁部は、それぞれ接着剤（例えば、ホットメルト）によって封止され、図３における紙面上の両側縁部２５、２６と下縁部２７とがそれぞれ折り返されている。なお、本実施形態では、ラミネートフィルム２１の両側縁部２５、２６と下縁部２７とをそれぞれ折り返しているが、これら各縁部を折り返さない構成としても良いことは勿論である。また、ラミネートフィルム２１の紙面上の上縁部２８は、正極タブ２２及び負極タブ２３が延出した状態で接着剤（例えば、ホットメルト）によって封止され、折り返されてはいない。
ラミネートフィルム２１の周縁部は、第一放熱板３１と第二放熱板３２との間に配置される上記した樹脂材１９及び弾性部材（発泡弾性体）３３によって保持されている。具体的には、ラミネートフィルム２１の両側縁部２５、２６及び下縁部２７は、上記した空間３５〜３７に充填される樹脂材１９によって保持され、この樹脂材１９が硬化することにより固着される。
また、ラミネートフィルム２１の上縁部２８のうち、上記した正極タブ２２及び負極タブ２３が位置する両端側は、図２Ｅに示す空間３８に充填される樹脂材１９によって保持され、この樹脂材１９が硬化することにより固着される。
一方、上縁部（周縁部）２８の中間部（一部）２８Ａには、樹脂材１９が充填されることはなく、この中間部２８Ａは弾性部材（発泡弾性体）３３によって保持されている。具体的には、図２Ａ及び図２Ｃに示すように、第一放熱板３１及び第二放熱板３２は、第一放熱板３１及び第二放熱板３２の端部から蓄電セル２０の正極タブ２２及び負極タブ２３側に延びる延出片３１Ａ、３２Ａを備え、これら延出片３１Ａ、３２Ａ間には、弾性部材（発泡弾性体）３３がラミネートフィルム２１の電池傾斜部２４Ａにかかるように介装されている。これにより、弾性部材３３と第一放熱板３１との間に上記した中間部２８Ａが挟まれることにより、この中間部２８Ａは弾性部材３３の付勢力で保持される。この弾性部材３３は、通気性を有する発泡樹脂材であり、本実施形態では、上記した弾性部材３４と同様にエプトシーラーが採用されている。As shown in FIG. 3, the storage cell 20 includes a pair of laminate films (film materials) 21, and an electrode unit connected to the positive electrode tab 22 and the negative electrode tab 23 is provided in the bulging portion 24 of the laminate film 21. An electrolytic solution (both not shown) is accommodated.
The peripheral edge of the laminate film 21 is sealed with an adhesive (for example, hot melt), and both side edges 25 and 26 and the lower edge 27 on the paper surface in FIG. 3 are folded back. In the present embodiment, the side edges 25 and 26 and the lower edge 27 of the laminate film 21 are folded back, but it is needless to say that these edges may not be folded. Further, the upper edge portion 28 on the paper surface of the laminate film 21 is sealed with an adhesive (for example, hot melt) in a state where the positive electrode tab 22 and the negative electrode tab 23 are extended, and is not folded back.
The peripheral edge of the laminate film 21 is held by the resin material 19 and the elastic member (foamed elastic body) 33 arranged between the first heat radiating plate 31 and the second heat radiating plate 32. Specifically, the side edges 25 and 26 and the lower edge 27 of the laminate film 21 are held by the resin material 19 filled in the spaces 35 to 37 described above, and are fixed when the resin material 19 is cured. The
Also, both end sides of the upper edge portion 28 of the laminate film 21 where the positive electrode tab 22 and the negative electrode tab 23 are positioned are held by the resin material 19 filled in the space 38 shown in FIG. Is fixed by curing.
On the other hand, the intermediate part (part) 28A of the upper edge part (peripheral part) 28 is not filled with the resin material 19, and the intermediate part 28A is held by an elastic member (foamed elastic body) 33. . Specifically, as shown in FIGS. 2A and 2C, the first heat radiating plate 31 and the second heat radiating plate 32 are connected to the positive electrode tab 22 of the storage cell 20 from the end portions of the first heat radiating plate 31 and the second heat radiating plate 32. And extending pieces 31A, 32A extending toward the negative electrode tab 23 side, and an elastic member (foamed elastic body) 33 is interposed between the extending pieces 31A, 32A so as to cover the battery inclined portion 24A of the laminate film 21. Has been. As a result, the intermediate portion 28 </ b> A described above is sandwiched between the elastic member 33 and the first heat radiating plate 31, whereby the intermediate portion 28 </ b> A is held by the urging force of the elastic member 33. The elastic member 33 is a foamed resin material having air permeability. In the present embodiment, an ept sealer is employed in the same manner as the elastic member 34 described above.

第一放熱板３１及び第二放熱板３２の延出片３１Ａ、３２Ａには、それぞれ通気孔３１Ｂ、３２Ｂが形成され、これら通気孔３１Ｂ、３２Ｂは、外装ケース１１に設けられた連通孔１５、１５の延長線上に設けられている。このため、各通気孔３１Ｂ、３２Ｂ、弾性部材３３、３４及び連通孔１５を介して、蓄電セル２０の中間部２８Ａと外装ケース１１の外側空間とが連通される。
また、延出片３１Ａ、３２Ａは、図２Ａに示すように、正極タブ２２及び負極タブ２３と重ならない位置（例えば、正極タブ２２と負極タブ２３との間）に設けられ、これら正極タブ２２及び負極タブ２３と略同じ高さに形成されている。このため、延出片３１Ａ、３２Ａ及び弾性部材３３が、正極タブ２２及び負極タブ２３の接続作業を邪魔することはなく、さらに、蓄電セル２０が必要以上に大きくなることが防止されるため、蓄電装置１０の小型化を図ることができる。The extending pieces 31A and 32A of the first heat radiating plate 31 and the second heat radiating plate 32 are formed with vent holes 31B and 32B, respectively, and the vent holes 31B and 32B are connected to the communication holes 15 provided in the outer case 11, respectively. 15 extension lines are provided. Therefore, the intermediate portion 28 </ b> A of the storage cell 20 and the outer space of the outer case 11 are communicated with each other through the vent holes 31 </ b> B and 32 </ b> B, the elastic members 33 and 34, and the communication hole 15.
Further, as shown in FIG. 2A, the extension pieces 31A and 32A are provided at positions that do not overlap the positive electrode tab 22 and the negative electrode tab 23 (for example, between the positive electrode tab 22 and the negative electrode tab 23). And it is formed in the substantially same height as the negative electrode tab 23. For this reason, the extending pieces 31A, 32A and the elastic member 33 do not disturb the connection work of the positive electrode tab 22 and the negative electrode tab 23, and further, the storage cell 20 is prevented from becoming unnecessarily large. The power storage device 10 can be downsized.

図４は、蓄電セル２０と外装ケース１１との組み付け状態を示す図である。
上述のように、外装ケース１１の内面には、浅溝部１６及び深溝部１７が設けられており、これら浅溝部１６、深溝部１７には、樹脂材１９を介して、それぞれ第二放熱板３２、第一放熱板３１が配置されている。ここで、樹脂材１９の熱抵抗θは、樹脂材１９の厚さＬに比例し、伝熱面積Ｓ（放熱板と溝部との対向面積）に反比例することが判明している。
θ＝Ｌ／ｋＳ（ｋは比例定数）
本構成では、深溝部１７での伝熱面積Ｓ１は、浅溝部１６での伝熱面積Ｓ２に比べて大きいため、深溝部１７の幅を浅溝部１６の幅よりも大きく形成している。具体的には、樹脂材１９の厚さＬ１、Ｌ２の比が深溝部１７での伝熱面積Ｓ１と浅溝部１６での伝熱面積Ｓ２との比と略同一になるように設定されている。
Ｌ１：Ｌ２≒Ｓ１：Ｓ２
これによれば、深溝部１７における樹脂材１９の厚さＬ１を浅溝部１６における樹脂材１９の厚さＬ２に比べて十分に大きく形成することができるため、浅溝部１６及び深溝部１７における樹脂材１９の熱抵抗θを略同一に設計することができるため、各蓄電セル２０間の温度差や温度勾配を抑制することができ、蓄電装置の出力容量の低下を防止できる。FIG. 4 is a diagram showing an assembled state of the storage cell 20 and the outer case 11.
As described above, the shallow groove portion 16 and the deep groove portion 17 are provided on the inner surface of the outer case 11, and the second heat radiating plate 32 is respectively provided in the shallow groove portion 16 and the deep groove portion 17 via the resin material 19. The 1st heat sink 31 is arrange | positioned. Here, it has been found that the thermal resistance θ of the resin material 19 is proportional to the thickness L of the resin material 19 and inversely proportional to the heat transfer area S (opposite area between the heat radiating plate and the groove).
θ = L / kS (k is a proportional constant)
In this configuration, since the heat transfer area S1 in the deep groove portion 17 is larger than the heat transfer area S2 in the shallow groove portion 16, the width of the deep groove portion 17 is formed larger than the width of the shallow groove portion 16. Specifically, the ratio of the thicknesses L1 and L2 of the resin material 19 is set to be substantially the same as the ratio of the heat transfer area S1 in the deep groove portion 17 and the heat transfer area S2 in the shallow groove portion 16. .
L1: L2≈S1: S2
According to this, since the thickness L1 of the resin material 19 in the deep groove portion 17 can be formed sufficiently larger than the thickness L2 of the resin material 19 in the shallow groove portion 16, the resin in the shallow groove portion 16 and the deep groove portion 17 can be formed. Since the thermal resistance θ of the material 19 can be designed to be substantially the same, a temperature difference or a temperature gradient between the storage cells 20 can be suppressed, and a decrease in the output capacity of the storage device can be prevented.

図５は、蓄電セルの内圧が解放された際の状態を示す図である。
上述したように、ラミネートフィルム２１の上縁部２８の中間部２８Ａは、第一放熱板３１と第二放熱板３２との間に介装された弾性部材３３の付勢力によって保持されている。本実施形態では、ラミネートフィルム２１の上縁部２８の中間部２８Ａは、図５に示すように、通気孔３１Ｂとオーバーラップするように配置されている。具体的には、中間部２８Ａが通気孔３１Ｂの略半分の高さ位置に配置されている。
ラミネートフィルム２１の上縁部２８の中間部２８Ａが通気孔３１Ｂ全体を覆うように配置すると、弾性部材３４による中間部２８Ａの保持力が向上する一方、通気孔３１Ｂの開口面積が減少し、速やかなガスの排出が実現できない。
また、中間部２８Ａを通気孔３１Ｂの略半分の高さ位置よりも低い位置に配置すると、通気孔３１Ｂの開口面積が増加するが、弾性部材３３と中間部２８Ａとの接触面積が減少するため、十分な保持力を実現できない。このため、本実施形態では、中間部２８Ａを通気孔３１Ｂの略半分の高さ位置に配置することにより、弾性部材３４による保持力の大きさと、通気孔３１Ｂの開口面積の大きさとの両立を図っている。FIG. 5 is a diagram illustrating a state when the internal pressure of the storage cell is released.
As described above, the intermediate portion 28 </ b> A of the upper edge portion 28 of the laminate film 21 is held by the urging force of the elastic member 33 interposed between the first heat radiating plate 31 and the second heat radiating plate 32. In the present embodiment, the intermediate portion 28A of the upper edge portion 28 of the laminate film 21 is disposed so as to overlap with the vent hole 31B as shown in FIG. Specifically, the intermediate portion 28A is disposed at a height position substantially half of the vent hole 31B.
When the intermediate portion 28A of the upper edge portion 28 of the laminate film 21 is disposed so as to cover the entire vent hole 31B, the holding force of the intermediate portion 28A by the elastic member 34 is improved, while the opening area of the vent hole 31B is reduced, and the Gas emissions cannot be realized.
Further, if the intermediate portion 28A is disposed at a position lower than the half of the height of the vent hole 31B, the opening area of the vent hole 31B increases, but the contact area between the elastic member 33 and the intermediate portion 28A decreases. Unable to achieve sufficient holding power. For this reason, in the present embodiment, by arranging the intermediate portion 28A at a height position that is substantially half of the vent hole 31B, both the magnitude of the holding force by the elastic member 34 and the magnitude of the opening area of the vent hole 31B can be achieved. I am trying.

蓄電セル２０の内圧が接着剤の接着力及び弾性部材３３の付勢力よりも上昇した場合には、この内圧によって弾性部材３３が変形するとともに、中間部２８Ａにおけるラミネートフィルム２１の封止が解除される。これによれば、蓄電セル２０内のガスは、通気孔３１Ｂ、３２Ｂ、弾性部材３３、３４及び連通孔１５を通じて、外装ケース１１の外部に排出される。このため、蓄電セル２０をそれぞれ第一放熱板３１及び第二放熱板３２で挟持し、これら放熱板３１、３２の間に硬化性を有する樹脂材１９を配置してラミネートフィルム２１の両側縁部２５，２６、下縁部２７及び上縁部２８の両端側を保持するとともに、この上縁部２８の中間部２８Ａに対応する放熱板３１、３２間に通気性を有する弾性部材３３を介装して当該中間部２８Ａを保持するといった簡単な構成で、蓄電セル２０内で発生したガスを外部に解放することができ、信頼性の高い蓄電装置１０を得ることができる。   When the internal pressure of the storage cell 20 is higher than the adhesive force of the adhesive and the biasing force of the elastic member 33, the elastic member 33 is deformed by the internal pressure and the sealing of the laminate film 21 in the intermediate portion 28A is released. The According to this, the gas in the storage cell 20 is discharged to the outside of the outer case 11 through the vent holes 31B and 32B, the elastic members 33 and 34, and the communication hole 15. Therefore, the storage cell 20 is sandwiched between the first heat radiating plate 31 and the second heat radiating plate 32, and the curable resin material 19 is disposed between the heat radiating plates 31 and 32, so that both side edges of the laminate film 21 are disposed. 25, 26, the lower edge portion 27, and the upper edge portion 28 are held at both ends, and an elastic member 33 having air permeability is interposed between the heat radiation plates 31 and 32 corresponding to the intermediate portion 28A of the upper edge portion 28. Thus, the gas generated in the power storage cell 20 can be released to the outside with a simple configuration such as holding the intermediate portion 28A, and the highly reliable power storage device 10 can be obtained.

以上、説明したように、本実施形態によれば、蓄電セル２０を、この蓄電セル２０よりも大きい一対の第一放熱板３１、第二放熱板３２でそれぞれ挟持するとともに、外装ケース１１の内面に、第一放熱板３１、第二放熱板３２が差し込まれる深溝部１７及び浅溝部１６を形成し、これら深溝部１７及び浅溝部１６には、第一放熱板３１及び第二放熱板３２と外装ケース１１との間に熱伝導性を有する樹脂材１９を充填したため、蓄電セル２０で発生した熱を各第一放熱板３１、第二放熱板３２及び樹脂材１９を介して、外装ケース１１に伝達することができ、蓄電セル２０を効果的に冷却することができる。また、外装ケース１１の内面に第一放熱板３１及び第二放熱板３２がそれぞれ差し込まれる深溝部１７及び浅溝部１６を形成し、これら深溝部１７及び浅溝部１６に樹脂材１９を充填しているため、外装ケース１１と樹脂材１９との接触面積を大きく確保することができ、外装ケース１１の大型化を防止できる。   As described above, according to the present embodiment, the power storage cell 20 is sandwiched between the pair of first heat radiating plate 31 and second heat radiating plate 32 that are larger than the power storage cell 20, and the inner surface of the exterior case 11. In addition, a deep groove portion 17 and a shallow groove portion 16 into which the first heat radiating plate 31 and the second heat radiating plate 32 are inserted are formed. In the deep groove portion 17 and the shallow groove portion 16, the first heat radiating plate 31 and the second heat radiating plate 32 Since the resin material 19 having thermal conductivity is filled between the outer case 11 and the outer case 11, the heat generated in the storage cell 20 is transferred to the outer case 11 via the first heat radiating plate 31, the second heat radiating plate 32, and the resin material 19. The power storage cell 20 can be effectively cooled. Further, the deep groove portion 17 and the shallow groove portion 16 into which the first heat radiating plate 31 and the second heat radiating plate 32 are respectively inserted are formed on the inner surface of the exterior case 11, and the resin material 19 is filled in the deep groove portion 17 and the shallow groove portion 16 Therefore, a large contact area between the outer case 11 and the resin material 19 can be secured, and an increase in the size of the outer case 11 can be prevented.

また、本実施形態によれば、第一放熱板３１とこの第一放熱板３１よりも小さい第二放熱板３２とを備え、外装ケース１１の内面には、第二放熱板３２が差し込まれる浅溝部１６と、この浅溝部１６よりも深く形成され、第一放熱板３１が差し込まれる深溝部１７とが交互に形成されているため、これら浅溝部１６及び深溝部１７の深さに適合するように第一放熱板３１及び第二放熱板３２を差し込むことにより、蓄電セル２０の組み付けを容易にすることができ、誤って組み付けることを防止できる。   Moreover, according to this embodiment, the 1st heat sink 31 and the 2nd heat sink 32 smaller than this 1st heat sink 31 are provided, and the 2nd heat sink 32 is inserted in the inner surface of the exterior case 11. Since the groove portions 16 and the deep groove portions 17 formed deeper than the shallow groove portions 16 and into which the first heat radiating plates 31 are inserted are alternately formed, the depths of the shallow groove portions 16 and the deep groove portions 17 are adapted. By inserting the first heat radiating plate 31 and the second heat radiating plate 32, it is possible to facilitate the assembly of the storage cell 20, and to prevent the erroneous assembly.

また、本実施形態によれば、深溝部１７と浅溝部１６との幅の比を、深溝部１７に対向する第一放熱板３１の面積Ｓ１と、浅溝部１６に対向する第二放熱板３２の面積Ｓ２との比と略同一としたため、これら浅溝部１６及び深溝部１７における樹脂材１９の熱抵抗を略同一とすることができ、各蓄電セル２０間の温度差や温度勾配を抑制することができるため、蓄電装置１０の出力容量の低下を防止できる。   Further, according to the present embodiment, the width ratio between the deep groove portion 17 and the shallow groove portion 16 is set such that the area S1 of the first heat radiating plate 31 facing the deep groove portion 17 and the second heat radiating plate 32 facing the shallow groove portion 16. Therefore, the thermal resistance of the resin material 19 in the shallow groove portion 16 and the deep groove portion 17 can be made substantially the same, and the temperature difference and the temperature gradient between the storage cells 20 are suppressed. Therefore, a decrease in the output capacity of the power storage device 10 can be prevented.

また、本実施形態によれば、第一放熱板３１及び第二放熱板３２には、ラミネートフィルム２１の上縁部２８の中間部２８Ａに対向する位置に通気孔３１Ｂ、３２Ｂが形成され、この通気孔３１Ｂ、３２Ｂは、隣接する他の放熱板の通気孔３１Ｂ、３２Ｂを介して、外装ケース１１に設けられた連通孔１５に連通しているため、蓄電セル２０内で発生したガスを、通気孔３１Ｂ、３２Ｂを通じて速やかに外装ケース１１の外部に排出することができる。   Further, according to the present embodiment, the first heat radiating plate 31 and the second heat radiating plate 32 are formed with the air holes 31B and 32B at positions facing the intermediate portion 28A of the upper edge portion 28 of the laminate film 21, The ventilation holes 31B and 32B communicate with the communication holes 15 provided in the outer case 11 through the ventilation holes 31B and 32B of other adjacent heat sinks. The air can be quickly discharged to the outside of the outer case 11 through the vent holes 31B and 32B.

また、本実施形態によれば、蓄電セル２０は、正極タブ２２及び負極タブ２３を備え、弾性部材３３が介装される延出片３１Ａ、３２Ａは、正極タブ２２及び負極タブ２３と並べて配置されるため、これら延出片３１Ａ、３２Ａ及び弾性部材３３が、正極タブ２２及び負極タブ２３への接続作業を邪魔することはなく、さらに、蓄電セル２０が必要以上に大きくなることが防止されるため、蓄電装置１０の小型化を図ることができる。   Further, according to the present embodiment, the storage cell 20 includes the positive electrode tab 22 and the negative electrode tab 23, and the extended pieces 31 </ b> A and 32 </ b> A on which the elastic member 33 is interposed are arranged side by side with the positive electrode tab 22 and the negative electrode tab 23. Therefore, the extending pieces 31A, 32A and the elastic member 33 do not interfere with the connection work to the positive electrode tab 22 and the negative electrode tab 23, and further, the storage cell 20 is prevented from becoming larger than necessary. Therefore, the power storage device 10 can be downsized.

次に、別の実施形態について説明する。図６は、この別の実施形態にかかる蓄電装置の正面図である。この別の実施形態において、上記した実施形態と同一の構成については、同一の符号を付して説明を省略する。また、蓄電装置に関する上下、幅といった方向の記載は図６を基準とした方向に従う。
一般に、浅溝部１６及び深溝部１７に充填される樹脂材１９は、金属製の放熱板３１、３２に比べて熱伝導性が低いため、浅溝部１６及び深溝部１７の幅を大きくとると、樹脂材１９の厚さＬ１、Ｌ２がその分大きくなり、蓄電セル２０の放熱性が低下する。
このため、この実施形態では、図６に示すように、外装ケース１１内の下部には、この外装ケース１１と第一放熱板３１との間に弾性部材１３４が介装されている。この弾性部材１３４は、上記した弾性部材３４と同様に、通気性を有する発泡樹脂材（エプトシーラー（登録商標））で形成され、第一放熱板３１及び第二放熱板３２をそれぞれ、深溝部１７及び浅溝部１６の上方の壁面１７Ａ、１６Ａに直接接触させた状態で蓄電セル２０の位置決めを行っている。そして、上記した状態で深溝部１７及び浅溝部１６に樹脂材１９が充填されている。Next, another embodiment will be described. FIG. 6 is a front view of a power storage device according to another embodiment. In this other embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted. In addition, descriptions of directions such as up and down and width regarding the power storage device follow the directions with reference to FIG.
In general, since the resin material 19 filled in the shallow groove portion 16 and the deep groove portion 17 has lower thermal conductivity than the metal heat sinks 31 and 32, the width of the shallow groove portion 16 and the deep groove portion 17 is increased. The thicknesses L <b> 1 and L <b> 2 of the resin material 19 increase accordingly, and the heat dissipation of the storage cell 20 decreases.
For this reason, in this embodiment, as shown in FIG. 6, an elastic member 134 is interposed between the outer case 11 and the first heat radiating plate 31 at the lower part in the outer case 11. Similar to the elastic member 34 described above, the elastic member 134 is formed of a foamed resin material (Eptosealer (registered trademark)) having air permeability, and the first heat radiating plate 31 and the second heat radiating plate 32 are respectively connected to the deep groove portion 17. And the electrical storage cell 20 is positioned in the state which contacted the wall surface 17A, 16A above the shallow groove part 16 directly. In the above-described state, the deep groove portion 17 and the shallow groove portion 16 are filled with the resin material 19.

この構成によれば、第一放熱板３１及び第二放熱板３２の一部を、直接、外装ケース１１の深溝部１７及び浅溝部１６の一方の壁面に接触させることができるため、各蓄電セル２０から発せられた熱量を第一放熱板３１及び第二放熱板３２を介して速やかに外装ケース１１に伝達することができ、放熱性の向上を図ることができる。また、この実施形態では、最上段の第一放熱板３１と外装ケース１１との間には、ゴムシート１３５が配置されており、当該第一放熱板３１と外装ケース１１との過剰な熱伝達を防止している。このゴムシート１３５の厚みは、最上段の第一放熱板３１から放出される熱量と、他の放熱板から放出される熱量とが略同一となる厚みとするのが好ましい。
なお、この別の実施形態では、弾性部材１３４は、蓄電セル２０と略同一幅を有して一体に形成されていたが、これに限るものではなく、例えば、蓄電セル２０の幅方向に３分割し、当該蓄電セル２０の中央部及び両端部にそれぞれ配置しても構わない。また、この別の実施形態では、弾性部材１３４を外装ケース１１内の下部に配置し、ゴムシート１３５を外装ケース１１内の上部に配置しているが、第一放熱板３１及び第二放熱板３２を、それぞれ深溝部１７及び浅溝部１６の一方の壁面に直接接触させることができれば、弾性部材１３４を外装ケース１１内の上部に配置して、第一放熱板３１及び第二放熱板３２を、それぞれ深溝部１７及び浅溝部１６の下方の壁面に直接接触させる構成としても良いことは勿論である。According to this configuration, a part of the first heat radiating plate 31 and the second heat radiating plate 32 can be brought into direct contact with one wall surface of the deep groove portion 17 and the shallow groove portion 16 of the outer case 11. The amount of heat generated from 20 can be quickly transmitted to the outer case 11 via the first heat radiating plate 31 and the second heat radiating plate 32, and the heat dissipation can be improved. In this embodiment, a rubber sheet 135 is disposed between the uppermost first heat radiating plate 31 and the outer case 11, and excessive heat transfer between the first heat radiating plate 31 and the outer case 11 is performed. Is preventing. The thickness of the rubber sheet 135 is preferably set so that the amount of heat released from the uppermost first heat radiating plate 31 is substantially the same as the amount of heat released from other heat radiating plates.
In this alternative embodiment, the elastic member 134 is formed integrally with the power storage cell 20 having substantially the same width. However, the elastic member 134 is not limited to this. For example, the elastic member 134 is 3 in the width direction of the power storage cell 20. You may divide | segment and arrange | position at the center part and the both ends of the said electrical storage cell 20, respectively. In this other embodiment, the elastic member 134 is disposed in the lower part of the outer case 11 and the rubber sheet 135 is disposed in the upper part of the outer case 11. 32 can be brought into direct contact with one wall surface of each of the deep groove portion 17 and the shallow groove portion 16, the elastic member 134 is disposed on the upper portion in the outer case 11, and the first heat radiating plate 31 and the second heat radiating plate 32 are disposed. Of course, it is also possible to adopt a configuration in which each of the deep groove portion 17 and the shallow groove portion 16 is in direct contact with the lower wall surface.

ところで、上記した蓄電装置１０では、外装ケース１１内に積層された複数の蓄電セル２０の内、中央部に配置された蓄電セル２０の温度が上昇しやすい傾向にある。この場合には、外装ケース１１内の中央部に配置される蓄電セル２０を挟持する放熱板の厚みを、当該外装ケース１１内の上部または下部に配置される蓄電セル２０を挟持する放熱板よりも厚く形成することもできる。この構成では、放熱板の厚みを厚くすることにより、外装ケース１１内の中央部に配置される蓄電セル２０の熱伝導性が向上し、積層された各蓄電セル２０の温度の均一化を図ることができる。   By the way, in the above-described power storage device 10, among the plurality of power storage cells 20 stacked in the outer case 11, the temperature of the power storage cell 20 disposed in the central portion tends to increase easily. In this case, the thickness of the heat radiating plate that sandwiches the power storage cell 20 disposed in the center of the outer case 11 is set to be larger than that of the heat radiating plate that sandwiches the power storage cell 20 disposed in the upper or lower portion of the outer case 11. It can also be formed thick. In this configuration, by increasing the thickness of the heat radiating plate, the thermal conductivity of the power storage cells 20 arranged in the central portion in the outer case 11 is improved, and the temperature of the stacked power storage cells 20 is made uniform. be able to.

１０ 蓄電装置
１１ 外装ケース
１５ 連通孔（孔部）
１６ 浅溝部
１７ 深溝部
１９ 樹脂材
２０ 蓄電セル
２１ ラミネートフィルム（フィルム材）
２２ 正極タブ
２３ 負極タブ
２８ 上縁部（周縁部）
２８Ａ 中間部（一部）
３１ 第一放熱板
３１Ａ 延出片
３１Ｂ 通気孔
３２ 第二放熱板
３２Ａ 延出片
３２Ｂ 通気孔
３３ 弾性部材（発泡弾性体）10 Power Storage Device 11 Exterior Case 15 Communication Hole (Hole)
16 Shallow groove portion 17 Deep groove portion 19 Resin material 20 Storage cell 21 Laminate film (film material)
22 Positive electrode tab 23 Negative electrode tab 28 Upper edge part (peripheral part)
28A Middle part (part)
31 1st heat sink 31A extension piece 31B vent hole 32 2nd heat sink 32A extension piece 32B vent hole 33 elastic member (foaming elastic body)

Claims (7)

平板状の蓄電セルを複数積層して外装ケースに収容した蓄電装置において、
前記蓄電セルを、この蓄電セルよりも大きい一対の放熱板で挟持するとともに、前記外装ケースの内面に、前記放熱板が差し込まれる溝部を形成し、この溝部には、前記放熱板と前記外装ケースとの間に熱伝導性を有する封止材を充填したことを特徴とする蓄電装置。In a power storage device in which a plurality of flat storage cells are stacked and accommodated in an outer case,
The power storage cell is sandwiched between a pair of heat sinks larger than the power storage cell, and a groove portion into which the heat sink plate is inserted is formed on the inner surface of the outer case, and the heat sink and the outer case are formed in the groove portion. A power storage device characterized by being filled with a sealing material having thermal conductivity. 前記一対の放熱板は、第一放熱板とこの第一放熱板よりも小さい第二放熱板とを備え、前記外装ケースの内面には、前記第二放熱板が差し込まれる浅溝部と、この浅溝部よりも深く形成され、前記第一放熱板が差し込まれる深溝部とが交互に形成されていることを特徴とする請求項１に記載の蓄電装置。   The pair of heat radiating plates includes a first heat radiating plate and a second heat radiating plate smaller than the first heat radiating plate, and a shallow groove portion into which the second heat radiating plate is inserted and an inner surface of the outer case. 2. The power storage device according to claim 1, wherein the power storage device is formed so as to be deeper than the groove and alternately formed with the deep groove into which the first heat radiating plate is inserted. 前記深溝部と前記浅溝部との幅の比を、前記深溝部に対向する第一放熱板の面積と、前記浅溝部に対向する第二放熱板の面積との比と略同一としたことを特徴とする請求項２に記載の蓄電装置。   The ratio of the width of the deep groove portion to the shallow groove portion is substantially the same as the ratio of the area of the first heat radiating plate facing the deep groove portion and the area of the second heat radiating plate facing the shallow groove portion. The power storage device according to claim 2. フィルム材の周縁部を封止して平板状に形成された複数の蓄電セルを備え、これら蓄電セルを積層して外装ケースに収容した蓄電装置において、
前記蓄電セルをそれぞれ一対の放熱板で挟持し、これら放熱板の間に硬化性樹脂材を配置して前記フィルム材の周縁部の一部を除く他の部分を保持するとともに、前記周縁部の一部に対応する前記放熱板間に通気性を有する発泡弾性体を介装して当該周縁部の一部を保持したことを特徴とする蓄電装置。In a power storage device including a plurality of power storage cells formed in a flat plate shape by sealing a peripheral portion of a film material, and laminating these power storage cells and accommodated in an outer case,
Each of the power storage cells is sandwiched between a pair of heat radiating plates, a curable resin material is disposed between the heat radiating plates, and other portions except for a part of the peripheral portion of the film material are held, and a part of the peripheral portion A power storage device characterized in that a part of the peripheral edge is held by interposing a foamed elastic body having air permeability between the heat radiating plates corresponding to. 前記放熱板には、前記フィルム材の周縁部の一部に対向する位置に通気孔が形成され、この通気孔は、隣接する他の放熱板の通気孔を介して、外装ケースに設けられた孔部に連通していることを特徴とする請求項４に記載の蓄電装置。   The heat radiating plate is formed with a vent hole at a position facing a part of the peripheral edge of the film material, and the vent hole is provided in the exterior case via a vent hole of another adjacent radiating plate. The power storage device according to claim 4, wherein the power storage device communicates with the hole. 前記フィルム材の周縁部の一部は、側面視で前記通気孔とオーバーラップするように配置されていることを特徴とする請求項５に記載の蓄電装置。   6. The power storage device according to claim 5, wherein a part of a peripheral portion of the film material is disposed so as to overlap the vent hole in a side view. 前記蓄電セルは、正極タブ及び負極タブを備え、前記発泡弾性体は前記正極タブ及び負極タブと並べて配置されることを特徴とする請求項４乃至６のいずれかに記載の蓄電装置。   The power storage device according to claim 4, wherein the power storage cell includes a positive electrode tab and a negative electrode tab, and the foamed elastic body is arranged side by side with the positive electrode tab and the negative electrode tab.
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