JP7208145B2 - power supply - Google Patents

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JP7208145B2
JP7208145B2 JP2019544516A JP2019544516A JP7208145B2 JP 7208145 B2 JP7208145 B2 JP 7208145B2 JP 2019544516 A JP2019544516 A JP 2019544516A JP 2019544516 A JP2019544516 A JP 2019544516A JP 7208145 B2 JP7208145 B2 JP 7208145B2
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power supply
supply device
heat
resistant sheet
battery
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JPWO2019065169A1 (en
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晴彦 米田
真己 拝野
裕司 岸田
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Sanyo Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/271—Lids or covers for the racks or secondary casings
    • H01M50/273—Lids or covers for the racks or secondary casings characterised by the material
    • H01M50/278—Organic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Battery Mounting, Suspending (AREA)

Description

本発明は、内蔵する電池の熱暴走を防止して高い安全性を確保する電源装置に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device that prevents thermal runaway of a built-in battery to ensure high safety.

大出力で大容量の電源装置は、多数の電池を多段多列に配列して、直列や並列に接続している。この電源装置は、複数の電池を直列に接続して出力電圧を高く、並列に接続して出力電流を大きくしている。この種の電源装置は、電池の熱暴走が安全性を低下させるので、確実に熱暴走を阻止する構造が要求される。多数の電池を内蔵する電源装置として、複数の電池ユニットに分割して組み立てる構造が採用される。この電源装置は、同じ電池ユニットを多量生産してコストダウンでき、さらに、連結する電池ユニットの個数を増加して出力や充放電容量を大きくできる特徴がある。複数の電池ユニットを並べて配置する電源装置は、何れかの電池が熱暴走して、熱暴走が隣の電池に誘発されるのを阻止するために、電池ユニットの間に区画壁を設けている。（特許文献１参照） A large-output, large-capacity power supply device has a large number of batteries arranged in multiple rows and rows and connected in series or in parallel. In this power supply device, a plurality of batteries are connected in series to increase the output voltage, and connected in parallel to increase the output current. Since thermal runaway of the battery lowers the safety of this type of power supply device, a structure that reliably prevents thermal runaway is required. A structure in which a plurality of battery units are divided and assembled is adopted as a power supply device containing a large number of batteries. This power supply device has the characteristic that the same battery unit can be mass-produced to reduce the cost, and the number of connected battery units can be increased to increase the output and charge/discharge capacity. In a power supply device in which a plurality of battery units are arranged side by side, partition walls are provided between the battery units in order to prevent thermal runaway of any battery from inducing thermal runaway in the adjacent battery. . (See Patent Document 1)

特開２０１１－４９０１２号公報Japanese Unexamined Patent Application Publication No. 2011-49012

区画壁で熱暴走の誘発を防止する電源装置の断面図を図６に示している。この電源装置は、中空部１３３のある区画壁１３２で断熱して、熱暴走の誘発を阻止するが、区画壁１３２が電池セル１０１から噴射される高温・高圧の噴出ガスで溶融されると、熱暴走の誘発を確実に阻止できない。とくに、図６に示す電源装置は、区画壁１３２との対向面に、電池セル１０１の排出弁の排出口が配置されるので、開弁する排出弁から高温・高圧の噴出ガスが区画壁１３２に向かって直接に噴射される。噴出ガスは、例えば４００℃以上と極めて高温となることがある。したがって、高い安全性を確保するには、区画壁１３２に極めて高い耐熱特性の高価な材料を使用する必要があって、製造コストが高くなる。さらに、図６の電源装置は、電池セル１０１の端面と区画壁１３２との間にポッティング樹脂１０７を充填しているので、開弁する排出弁からスムーズに噴出ガスを排出できない。ポッティング樹脂１０７と区画壁１３２が、排出弁の排出口を塞いで噴出ガスの排出を阻止しているからである。 FIG. 6 shows a cross-sectional view of a power supply that prevents thermal runaway from being induced by partition walls. This power supply device is insulated by the partition wall 132 having the hollow portion 133 to prevent the induction of thermal runaway. Induction of thermal runaway cannot be reliably prevented. In particular, in the power supply device shown in FIG. 6, since the discharge port of the discharge valve of the battery cell 101 is arranged on the surface facing the partition wall 132, high-temperature and high-pressure ejected gas from the open discharge valve reaches the partition wall 132. sprayed directly toward The ejected gas may become extremely hot, for example, 400° C. or higher. Therefore, in order to ensure high safety, it is necessary to use an expensive material with extremely high heat resistance for the partition wall 132, which increases the manufacturing cost. Furthermore, in the power supply device of FIG. 6, since the potting resin 107 is filled between the end face of the battery cell 101 and the partition wall 132, the ejected gas cannot be discharged smoothly from the open discharge valve. This is because the potting resin 107 and the partition wall 132 block the discharge port of the discharge valve to prevent discharge of the ejected gas.

本発明は、以上の欠点を解決することを目的に開発されたものである。本発明の目的の一は、複数の電池ユニットを対向して配置しながら、電池ユニットに内蔵する電池セル端面の排出弁の排出口から噴出ガスをスムーズに排出し、排出される噴出ガスによる隣の電池の熱暴走の誘発を確実に阻止して、高い安全性を実現する電源装置を提供することにある。
また、本発明の他の目的は、安価な耐熱シートを使用して安価に多量生産しながら、電池の熱暴走の誘発を確実に防止できる電源装置を提供することにある。The present invention has been developed with the aim of solving the above drawbacks. One of the objects of the present invention is to smoothly discharge jetted gas from a discharge port of a discharge valve on the end surface of a battery cell incorporated in a battery unit while arranging a plurality of battery units facing each other, so that the discharged jetted gas causes a flow of gas. To provide a power supply device capable of realizing high safety by surely preventing induction of thermal runaway of a battery.
Another object of the present invention is to provide a power supply device that can reliably prevent the induction of thermal runaway of batteries while using inexpensive heat-resistant sheets for mass production at low cost.

課題を解決するための手段及び発明の効果Means for solving the problem and effects of the invention

本発明の第１の側面に係る電源装置は、設定圧力で開弁する排出弁の開口部を端面に配置してなる複数の電池セルを平行姿勢であって両端を同一平面に配置してなる電池ユニットが、絶縁スペースを介して前記電池セルの端面を対向して配置して、前記絶縁スペースに排出弁の排出口を配置してなる電池集合体を備え、前記絶縁スペースの中間に、前記排出弁の排出口から排出される噴出ガスで溶融されない耐熱シートが前記電池セルの端面と平行な姿勢で配置され、さらに、前記耐熱シートの両面に噴出ガスの排気チャンバーを設けている。 A power supply device according to a first aspect of the present invention is formed by arranging a plurality of battery cells arranged parallel to each other and having both ends on the same plane. A battery unit comprises a battery assembly in which the end faces of the battery cells are arranged facing each other with an insulating space interposed therebetween, and a discharge port of a discharge valve is arranged in the insulating space; A heat-resistant sheet that is not melted by the ejected gas discharged from the exhaust port of the exhaust valve is arranged parallel to the end faces of the battery cells, and an exhaust chamber for the ejected gas is provided on both sides of the heat-resistant sheet.

以上の電源装置は、複数の電池ユニットを対向して配置しながら、電池ユニットに内蔵する電池セル端面の排出弁の排出口から噴出ガスをスムーズに排出し、さらに排出される噴出ガスによる隣の電池セルの熱暴走の誘発を確実に阻止して、高い安全性を実現する特徴がある。それは、以上の電源装置が、両側に電池ユニットを配置している絶縁スペースの中間に、排出弁の排出口から排出される噴出ガスで溶融されない耐熱シートを電池セルの端面と平行な姿勢で配置して、耐熱シートの両面に噴出ガスの排気チャンバーを設けているからである。 In the power supply device described above, while arranging a plurality of battery units facing each other, the ejected gas is smoothly discharged from the exhaust port of the exhaust valve on the end surface of the battery cell incorporated in the battery unit, and the discharged ejected gas causes the next door to move. It has the characteristic of reliably preventing the induction of thermal runaway of the battery cell and realizing high safety. In the above power supply, in the middle of the insulating space where the battery units are arranged on both sides, a heat-resistant sheet that is not melted by the gas ejected from the discharge port of the discharge valve is placed in a posture parallel to the end face of the battery cell. This is because exhaust chambers for ejected gas are provided on both sides of the heat-resistant sheet.

また、以上の電源装置は、安価な耐熱シートを使用して安価に多量生産できる構造としながら、電池セルの熱暴走の誘発を確実に防止できる特徴がある。それは、以上の電源装置が、電池ユニット間の絶縁スペースの中間に耐熱シートを配置して、その両面に排気チャンバーを設けて、排出弁の排出口から噴射される噴出ガスを排気チャンバーに排出するからである。 In addition, the above-described power supply device has a feature of being able to reliably prevent induction of thermal runaway of the battery cells while having a structure that can be mass-produced at low cost by using an inexpensive heat-resistant sheet. The above power supply device has a heat-resistant sheet placed in the middle of the insulating space between the battery units, and an exhaust chamber is provided on both sides of the sheet, and the gas ejected from the exhaust port of the exhaust valve is discharged into the exhaust chamber. It is from.

また、第２の側面に係る電源装置によれば、上記構成に加えて、前記耐熱シートを耐熱紙とすることができる。 Moreover, according to the power supply device according to the second aspect, in addition to the above configuration, the heat-resistant sheet can be heat-resistant paper.

さらに、第３の側面に係る電源装置によれば、上記何れかの構成に加えて、前記耐熱シートの耐熱温度を５００℃以上とすることができる。 Furthermore, according to the power supply device according to the third aspect, in addition to any one of the above configurations, the heat resistant temperature of the heat resistant sheet can be set to 500° C. or higher.

さらに、第４の側面に係る電源装置によれば、上記何れかの構成に加えて、前記耐熱シートを、排出される噴出ガスで変形する可撓性シートとすることができる。 Furthermore, according to the power supply device according to the fourth aspect, in addition to any one of the above configurations, the heat-resistant sheet can be a flexible sheet that is deformed by the ejected gas.

さらに、第５の側面に係る電源装置によれば、上記何れかの構成に加えて、前記耐熱シートの両側に、前記絶縁スペースの外周部に沿う形状の閉塞カバーを配置して、該耐熱シートと前記電池ユニットとの間に前記排気チャンバーを形成することができる。 Furthermore, according to the power supply device according to the fifth aspect, in addition to any one of the above configurations, closing covers having a shape along the outer periphery of the insulating space are arranged on both sides of the heat-resistant sheet, and the heat-resistant sheet and the battery unit.

さらに、第６の側面に係る電源装置によれば、上記構成に加えて、前記閉塞カバーが、前記絶縁スペースの外周部を閉塞する外周枠部を有し、前記外周枠部の内側に排気チャンバーを設けて、前記排気チャンバーに前記排出弁の排出口を開口することができる。 Furthermore, according to the power supply device according to the sixth aspect, in addition to the above configuration, the closing cover has an outer peripheral frame portion that closes the outer peripheral portion of the insulating space, and the exhaust chamber is provided inside the outer peripheral frame portion. may be provided to open the exhaust port of the exhaust valve to the exhaust chamber.

さらに、第７の側面に係る電源装置によれば、上記何れかの構成に加えて、さらに、前記電池集合体に密着してなるポッティング樹脂を備えると共に、前記絶縁スペースに電池セルの排出弁の排出口を塞ぐ閉塞カバーを配置することができる。前記閉塞カバーは、前記電池セルの排出弁から排出される噴出ガスで溶融する独立気泡を有する絶縁材の発泡体とし、前記閉塞カバーで前記ポッティング樹脂の前記排出弁の開口部への流入を阻止し、かつ前記排出弁からの噴出ガスで溶融されて噴出ガスを通過させることができる。 Furthermore, according to the power supply device according to the seventh aspect, in addition to any one of the above configurations, it further includes a potting resin that is in close contact with the battery assembly, and a discharge valve for the battery cells in the insulating space. A blocking cover can be arranged to block the outlet. The closing cover is a foamed insulating material having closed cells that are melted by the gas ejected from the discharge valve of the battery cell, and the closing cover prevents the potting resin from flowing into the opening of the discharge valve. and melted by the gas ejected from the discharge valve to allow the ejected gas to pass through.

さらに、第８の側面に係る電源装置によれば、上記構成に加えて、前記閉塞カバーが、前記絶縁スペースの外周部を閉塞する外周枠部を有し、前記ポッティング樹脂を前記外周枠部の外側に充填すると共に、前記外周枠部の内側に排気チャンバーを設けて、前記排気チャンバーに前記排出弁の排出口が開口することができる。 Furthermore, according to the power supply device according to the eighth aspect, in addition to the above configuration, the closing cover has an outer peripheral frame portion that closes the outer peripheral portion of the insulating space, and the potting resin is applied to the outer peripheral frame portion. In addition to filling the outside, an exhaust chamber can be provided inside the outer peripheral frame, and the exhaust port of the exhaust valve can be opened to the exhaust chamber.

さらに、第９の側面に係る電源装置によれば、上記何れかの構成に加えて、前記閉塞カバーをゴム状弾性体の絶縁材とすることができる。 Furthermore, according to the power supply device according to the ninth aspect, in addition to any one of the above configurations, the closing cover can be made of a rubber-like elastic insulating material.

さらに、第１０の側面に係る電源装置によれば、上記何れかの構成に加えて、前記閉塞カバーを、前記耐熱シートと前記電池ユニットとの間に挟んで配置することができる。 Furthermore, according to the power supply device according to the tenth aspect, in addition to any one of the above configurations, the blocking cover can be sandwiched between the heat-resistant sheet and the battery unit.

さらに、第１１の側面に係る電源装置によれば、上記何れかの構成に加えて、前記閉塞カバーを、合成ゴムと軟質プラスチックの何れかの発泡体とすることができる。 Furthermore, according to the power supply device according to the eleventh aspect, in addition to any one of the configurations described above, the closing cover can be made of synthetic rubber or soft plastic foam.

さらに、第１２の側面に係る電源装置によれば、上記何れかの構成に加えて、前記耐熱シートの表面に絶縁シートを積層し、前記耐熱シートと、前記耐熱シートの両面に配置している閉塞カバーとを前記絶縁シートで一体構造に連結することができる。 Further, according to the power supply device according to the twelfth aspect, in addition to any one of the above configurations, an insulating sheet is laminated on the surface of the heat-resistant sheet and arranged on both sides of the heat-resistant sheet and the heat-resistant sheet. The closing cover can be connected to an integral structure by the insulating sheet.

本発明の一実施形態に係る電源装置を示す垂直断面図である。1 is a vertical sectional view showing a power supply device according to one embodiment of the present invention; FIG. 図１の電源装置の要部拡大断面図である。2 is an enlarged cross-sectional view of a main part of the power supply device of FIG. 1; FIG. 図１の電源装置のＩＩＩ－ＩＩＩ線断面図である。2 is a cross-sectional view of the power supply device of FIG. 1 taken along line III-III. FIG. 図１の電源装置の電池集合体の分解斜視図である。2 is an exploded perspective view of a battery assembly of the power supply device of FIG. 1; FIG. 図４に示す閉塞カバーの分解斜視図である。FIG. 5 is an exploded perspective view of the blocking cover shown in FIG. 4; 従来の電源装置の断面図である。1 is a cross-sectional view of a conventional power supply device; FIG.

以下、本発明の実施の形態を図面に基づいて説明する。ただし、以下に示す実施の形態は、本発明の技術思想を具体化するための構成を例示するものであって、本発明は以下のものに特定されない。また、特許請求の範囲に示される部材を、実施の形態の部材に特定するものでは決してない。特に実施の形態に記載されている構成部材の寸法、材質、形状、その相対的配置等は、特に特定的な記載がない限りは、本発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。なお、各図面が示す部材の大きさや位置関係等は、説明を明確にするため誇張していることがある。さらに以下の説明において、同一の名称、符号については同一もしくは同質の部材を示しており、詳細説明を適宜省略する。さらに、本発明を構成する各要素は、複数の要素を同一の部材で構成して一の部材で複数の要素を兼用する態様としてもよいし、逆に一の部材の機能を複数の部材で分担して実現することもできる。また、一部の実施例、実施形態において説明された内容は、他の実施例、実施形態等に利用可能なものもある。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below are examples of configurations for embodying the technical idea of the present invention, and the present invention is not limited to the following. In addition, the members shown in the claims are by no means specified as the members of the embodiment. In particular, the dimensions, materials, shapes, relative arrangements, etc. of the constituent members described in the embodiment are not intended to limit the scope of the present invention, and are merely It is only an illustrative example. Note that the sizes and positional relationships of members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same names and symbols indicate the same or homogeneous members, and detailed description thereof will be omitted as appropriate. Furthermore, each of the elements constituting the present invention may be configured with the same member so that a single member may serve as a plurality of elements, or conversely, the function of one member may be performed by a plurality of members. It can also be realized by sharing. Also, the contents described in some of the examples and embodiments can also be used in other examples and embodiments.

以下に示す電源装置は、主として、モータのみで走行する電気自動車や電動カートなどの電動車両の駆動用電源に適用する例を説明する。なお本発明の電源装置を、エンジンとモータの両方で走行するハイブリッド車に使用したり、電動車両以外の大出力が要求される用途、例えば家庭用、工場用の蓄電装置等に使用してもよい。
（実施形態１）The power supply device shown below is mainly applied to a power source for driving an electric vehicle such as an electric vehicle or an electric cart that runs only by a motor. The power supply device of the present invention can be used in a hybrid vehicle that runs on both an engine and a motor, or in applications that require a large output other than electric vehicles, such as power storage devices for households and factories. good.
(Embodiment 1)

図１～図３に示す電源装置１００は、外装ケース９に電池集合体４０を内蔵している。電池集合体４０は、一対の電池ユニット４０Ａを備えており、一対の電池ユニット４０Ａを対向位置（図１において左右）に配置して連結している。
（電池ユニット４０Ａ）A power supply device 100 shown in FIGS. 1 to 3 has a battery assembly 40 built in an exterior case 9 . The battery assembly 40 includes a pair of battery units 40A, and the pair of battery units 40A are arranged and connected to opposite positions (right and left in FIG. 1).
(Battery unit 40A)

電池ユニット４０Ａは、図１及び図４に示すように、複数の二次電池セル１を平行姿勢に並べて、両端を同一平面に配置して、両端の端部電極１３にリード板４５を接続している。電池集合体４０は、対向位置に配置する一対の電池ユニット４０Ａを二次電池セル１の軸方向に並べて配置すると共に、一対の電池ユニット４０Ａの間に絶縁スペース６を設けている。各々の電池ユニット４０Ａは、図２の拡大断面図に示すように、絶縁スペース６の対向位置に端部電極１３を配置している。
（二次電池セル１）In the battery unit 40A, as shown in FIGS. 1 and 4, a plurality of secondary battery cells 1 are arranged in parallel, both ends are arranged on the same plane, and lead plates 45 are connected to the end electrodes 13 at both ends. ing. In the battery assembly 40, a pair of battery units 40A arranged at opposing positions are arranged side by side in the axial direction of the secondary battery cell 1, and an insulating space 6 is provided between the pair of battery units 40A. Each battery unit 40A has an end electrode 13 located opposite the insulating space 6, as shown in the enlarged cross-sectional view of FIG.
(Secondary battery cell 1)

二次電池セル１は、設定圧力で開弁する排出弁の排出口（図示せず）を端面に設けている。二次電池セル１は両端に端部電極１３を設けている。この二次電池セル１は、アルミニウム等の金属製外装缶の開口部を封口板で気密に密閉して、封口板に凸部電極を設けて第１の端部電極１３Ａとし、外装缶の底面を第２の端部電極１３Ｂとしている。排出弁の排出口は、凸部電極側に設けられ、あるいは外装缶の底面に設けられる。 The secondary battery cell 1 is provided with a discharge port (not shown) of a discharge valve that opens at a set pressure on the end face. The secondary battery cell 1 is provided with end electrodes 13 at both ends. In this secondary battery cell 1, the opening of a metal can made of aluminum or the like is airtightly sealed with a sealing plate, and a convex electrode is provided on the sealing plate to form a first end electrode 13A. is used as the second end electrode 13B. The discharge port of the discharge valve is provided on the convex electrode side or on the bottom surface of the outer can.

二次電池セル１は、円筒形電池のリチウムイオン電池である。リチウムイオン電池は、大きさや重量に対する容量が大きく、電源装置１００のトータル容量を大きくできる。ただし、本発明の電源装置は、二次電池セルをリチウムイオン電池には特定しない。二次電池セルには、充電できる他の二次電池が使用できる。また、図１の電源装置１００は、二次電池セル１を円筒形電池とするが、二次電池セルには角形電池も使用できる。各々の二次電池セル１は、その両端の端部電極１３にリード板４５を溶接して、隣接する二次電池セル１を直列又は並列に接続している。
（電池ホルダ４４）The secondary battery cell 1 is a cylindrical lithium ion battery. A lithium ion battery has a large capacity relative to its size and weight, and can increase the total capacity of the power supply device 100 . However, in the power supply device of the present invention, the secondary battery cells are not specified as lithium ion batteries. Other rechargeable secondary batteries can be used as the secondary battery cells. Moreover, although the power supply device 100 of FIG. 1 uses a cylindrical battery as the secondary battery cell 1, a prismatic battery can also be used as the secondary battery cell. Adjacent secondary battery cells 1 are connected in series or in parallel by welding lead plates 45 to the end electrodes 13 at both ends of each secondary battery cell 1 .
(battery holder 44)

二次電池セル１は、図４に示すように、電池ホルダ４４で定位置に配置している。電池ホルダ４４はプラスチック等の絶縁材を成形して制作される。図の電池ホルダ４４は、すべての二次電池セル１を平行な姿勢で定位置に配置している。電池ホルダ４４で定位置に配置される二次電池セル１は、その両端にリード板４５を溶接するので、各々の端部に溶接されるリード板４５を同一面に位置するように、各々の二次電池セル１をその両端部がほぼ同一面に位置するように、電池ホルダ４４に配置している。 The secondary battery cell 1 is placed in a fixed position with a battery holder 44 as shown in FIG. The battery holder 44 is manufactured by molding an insulating material such as plastic. In the illustrated battery holder 44, all the secondary battery cells 1 are arranged in a fixed position in a parallel posture. Since the lead plate 45 is welded to both ends of the secondary battery cell 1 placed in a fixed position by the battery holder 44, each lead plate 45 welded to each end is positioned on the same plane. The secondary battery cell 1 is arranged in the battery holder 44 so that both ends thereof are positioned substantially on the same plane.

電池ホルダ４４は、二次電池セル１を挿入して定位置に配置する挿入部４４Ａを設けている。図の電源装置１００は、二次電池セル１を円筒形電池とするので、挿入部４４Ａを円柱状としている。電池ホルダ４４は、プラスチックを筒状に成形して内側に挿入部４４Ａを設けている。挿入部４４Ａは、電池端部を露出させる開口部４４Ｂを両端に設けている。開口部４４Ｂは、挿入部４４Ａに挿入される二次電池セル１の端部を挿入部４４Ａから外部に露出させる。開口部４４Ｂに露出される二次電池セル１の端面は、端部電極１３となってここにリード板４５が溶接して固定される。 The battery holder 44 is provided with an insertion portion 44A into which the secondary battery cell 1 is inserted and arranged at a fixed position. In the illustrated power supply device 100, the secondary battery cell 1 is a cylindrical battery, so the insertion portion 44A is cylindrical. The battery holder 44 is formed by molding plastic into a cylindrical shape and has an insertion portion 44A inside. The insertion portion 44A has openings 44B at both ends thereof for exposing battery ends. The opening 44B exposes the end of the secondary battery cell 1 inserted into the insertion portion 44A from the insertion portion 44A. The end face of the secondary battery cell 1 exposed to the opening 44B serves as the end electrode 13, and the lead plate 45 is welded and fixed here.

図１に示すように、一対の電池ユニット４０Ａの間に絶縁スペース６を設けて、絶縁スペース６の両側に二次電池セル１の端面を配置する電池集合体４０は、排出弁の排出口が絶縁スペース６に配置される。排出弁が開弁すると、排出口から排出される高温の噴出ガスが対向する電池ユニット４０Ａの端面に向かって噴射される。対向位置にある二次電池セル１の対向面に噴射される高温の噴出ガスは、二次電池セル１の熱暴走を誘発する原因となる。図１の電源装置１００は、絶縁スペース６の中間に耐熱シート６４を配置している。
（耐熱シート６４）As shown in FIG. 1, a battery assembly 40 in which an insulating space 6 is provided between a pair of battery units 40A and the end surfaces of secondary battery cells 1 are arranged on both sides of the insulating space 6 has a discharge port of a discharge valve. It is arranged in the insulating space 6 . When the discharge valve opens, the high-temperature jetted gas discharged from the discharge port is jetted toward the facing end face of the battery unit 40A. The high-temperature ejected gas jetted to the facing surface of the secondary battery cell 1 at the facing position causes thermal runaway of the secondary battery cell 1 . The power supply device 100 of FIG. 1 has a heat-resistant sheet 64 arranged in the middle of the insulating space 6 .
(Heat resistant sheet 64)

耐熱シート６４は、排出弁から排出される噴出ガスで溶融されない耐熱温度の絶縁シートで、たとえば難燃処理した耐熱紙である。ただ、耐熱シート６４には、耐熱紙に代わって噴出ガスで溶融されない無機繊維をシート状に集合した紙や不織布、あるいは、無機材を薄いシート状に結合した無機シート等も使用できる。これ等の耐熱シート６４は薄くできるので、耐熱シート６４が絶縁スペース６の実質容積を減少することなく絶縁スペース６を広くして噴出ガスをスムーズに排出できる特徴がある。絶縁性の耐熱シート６４は、両面に配置される二次電池セル１の端面やリード板４５を絶縁状態に配置できる。ただ、耐熱シートは必ずしも絶縁材とする必要はない。それは、耐熱シートの表面に絶縁シートを積層して表面を絶縁できるからである。ただし、耐熱シートを絶縁材としてその表面に絶縁材を積層する構造は、耐熱シートによる絶縁性をさらに向上できる。 The heat-resistant sheet 64 is an insulating sheet having a heat-resistant temperature that is not melted by the gas discharged from the discharge valve, such as flame-retardant heat-resistant paper. However, the heat-resistant sheet 64 can be replaced with paper or non-woven fabric in which inorganic fibers that are not melted by the ejected gas are aggregated in a sheet form, or an inorganic sheet in which inorganic materials are combined in a thin sheet form, or the like. Since these heat-resistant sheets 64 can be made thin, there is a feature that the heat-resistant sheets 64 can widen the insulating space 6 without reducing the actual volume of the insulating space 6 and smoothly discharge the ejected gas. The insulating heat-resistant sheet 64 can insulate the end surfaces of the secondary battery cells 1 and the lead plates 45 arranged on both sides. However, the heat-resistant sheet does not necessarily have to be an insulating material. This is because the surface can be insulated by laminating an insulating sheet on the surface of the heat-resistant sheet. However, a structure in which a heat-resistant sheet is used as an insulating material and an insulating material is laminated on the surface thereof can further improve the insulating properties of the heat-resistant sheet.

耐熱シート６４は、二次電池セル１の端面と平行な姿勢で配置される。図の電源装置１００は、絶縁スペース６の中間に耐熱シート６４を配置して、耐熱シート６４の両面には噴出ガスの排気チャンバー６３を設けている。絶縁スペース６の中間に耐熱シート６３を配置するために、図１～図５の電源装置１００は、耐熱シート６４の両側に絶縁スペースの外周部に沿う形状の閉塞カバー６１を配置し、この閉塞カバー６１を耐熱シート６４と電池ユニット４０Ａとの間に介在させている。図の閉塞カバー６１は、絶縁スペース６の外周部に沿う形状の外周枠部６２を有している。電源装置１００は、この形状の閉塞カバー６１を電池ユニット４０の対向面４０ａと耐熱シート６４との間に配置することで、耐熱シート６４を電池ユニット４０の対向面４０ａから離間する状態で配置して、耐熱シート６４と電池ユニット４０の対向面４０ａとの間であって外周枠部６２の内側に排気チャンバー６３を設けている。 The heat-resistant sheet 64 is arranged parallel to the end faces of the secondary battery cells 1 . In the illustrated power supply device 100, a heat-resistant sheet 64 is placed in the middle of the insulating space 6, and exhaust chambers 63 for jetting gas are provided on both sides of the heat-resistant sheet 64. FIG. In order to arrange the heat-resistant sheet 63 in the middle of the insulating space 6, the power supply device 100 of FIGS. A cover 61 is interposed between the heat-resistant sheet 64 and the battery unit 40A. The illustrated closing cover 61 has an outer peripheral frame portion 62 shaped along the outer peripheral portion of the insulating space 6 . In the power supply device 100, the blocking cover 61 having this shape is arranged between the facing surface 40a of the battery unit 40 and the heat-resistant sheet 64, so that the heat-resistant sheet 64 is arranged in a state separated from the facing surface 40a of the battery unit 40. An exhaust chamber 63 is provided inside the outer peripheral frame portion 62 between the heat-resistant sheet 64 and the facing surface 40 a of the battery unit 40 .

このように、耐熱シート６４の両面に排気チャンバー６３を設けている絶縁スペース６は、噴出ガスをスムーズに抵抗なく排気チャンバー６３に排出できる。また、この構造の絶縁スペース６は、噴出ガスを排気チャンバー６３で拡散して耐熱シート６４に吹き付けるので、噴出ガスによる耐熱シート６４の熱損傷を少なくして、対向位置にある二次電池セル１の熱暴走の誘発をより効果的に阻止できる。さらに耐熱シート６４に要求される強度と耐熱特性を低下して、耐熱シート６４のコストを低減できる。さらにまた、耐熱シート６４の表面に吹き付けられる噴出ガスを排気チャンバー６３で両側に分散させるので、噴出ガスを少ない排気抵抗でスムーズに絶縁スペース６に排出できる特徴も実現する。このことは、内圧が異常に上昇した二次電池セル１の圧力を速やかに低下して、内圧上昇による外装缶の破裂などの弊害を有効に防止できる。 Thus, the insulating space 6 in which the exhaust chambers 63 are provided on both sides of the heat-resistant sheet 64 can smoothly discharge the ejected gas to the exhaust chambers 63 without resistance. In addition, in the insulating space 6 of this structure, the ejected gas is diffused in the exhaust chamber 63 and blown to the heat-resistant sheet 64, so that the heat-resistant sheet 64 is less thermally damaged by the ejected gas, and the secondary battery cell 1 located at the opposite position is reduced. can more effectively prevent the induction of thermal runaway. Furthermore, the strength and heat resistance required for the heat resistant sheet 64 are lowered, and the cost of the heat resistant sheet 64 can be reduced. Furthermore, since the ejected gas blown onto the surface of the heat-resistant sheet 64 is dispersed on both sides by the exhaust chamber 63, the feature that the ejected gas can be smoothly discharged to the insulating space 6 with little exhaust resistance is realized. As a result, the pressure of the secondary battery cell 1 whose internal pressure has abnormally increased can be quickly reduced, and it is possible to effectively prevent damage such as bursting of the outer can due to the internal pressure increase.

さらに、耐熱シート６４は、排出される噴出ガスで変形する可撓性シートとしている。この耐熱シート６４は、噴射される噴出ガスの圧力で変形して、噴出ガスが排出される一方の排気チャンバー６３の容積を増加できるので、排出弁の排出口から排気チャンバー６３により少ない抵抗で噴出ガスをスムーズに排出して、二次電池セル１の内圧上昇による破壊を効果的に防止してより高い安全性を確保できる特徴がある。
（ポッティング樹脂７）Furthermore, the heat-resistant sheet 64 is a flexible sheet that is deformed by the ejected gas. The heat-resistant sheet 64 is deformed by the pressure of the ejected gas, and can increase the volume of the exhaust chamber 63 through which the ejected gas is discharged. It is characterized by smoothly discharging gas and effectively preventing destruction due to an increase in the internal pressure of the secondary battery cell 1, thereby ensuring a higher level of safety.
(Potting resin 7)

電源装置１００は、二次電池セル１の表面や電池ホルダ４４にポッティング樹脂７を密着させ、二次電池セル１の放熱特性を向上している。電池集合体４０は、ポッティング樹脂７に密着されて、二次電池セル１の熱エネルギーをポッティング樹脂７に伝導して放熱する。ポッティング樹脂７は、電池表面に直接に密着し、あるいは電池ホルダ４４やリード板４５を介して二次電池セル１に密着されて二次電池セル１の熱を放熱する。ポッティング樹脂７は、たとえば、電池集合体４０を防水袋７５に入れ、防水袋７５に未硬化で液状のポッティング樹脂７を充填し、ポッティング樹脂７を硬化させて電池集合体４０に密着状態となる。ただし、本発明は、ポッティング樹脂７を電池集合体４０の二次電池セル１や電池ホルダ４４等に密着する構造や方法を特定するものでないので、電池集合体を外装ケースに入れてポッティング樹脂を外装ケースに充填して密着することができ、また、ポッティング樹脂を充填するスペースを電池ホルダに設け、あるいは又ポッティング樹脂を充填する筐体に電池集合体を入れて充填することもできる。ポッティング樹脂７は、電池集合体４０の電池表面などに密着する熱伝導面積を広くして、二次電池セル１を効果的に放熱できる。未硬化のポッティング樹脂７は液状で、充填されて狭い隙間にも浸入するので、二次電池セル１の端面に溶接しているリード板４５の開口部や二次電池セル１との隙間から浸入して二次電池セル１の表面に密着される。 In the power supply device 100 , the potting resin 7 is adhered to the surface of the secondary battery cell 1 and the battery holder 44 to improve the heat dissipation characteristics of the secondary battery cell 1 . The battery assembly 40 is in close contact with the potting resin 7 and conducts the thermal energy of the secondary battery cells 1 to the potting resin 7 to dissipate the heat. The potting resin 7 is in direct contact with the surface of the battery, or in contact with the secondary battery cell 1 via the battery holder 44 or the lead plate 45 to dissipate the heat of the secondary battery cell 1 . For potting resin 7 , for example, battery assembly 40 is placed in waterproof bag 75 , waterproof bag 75 is filled with uncured liquid potting resin 7 , and potting resin 7 is hardened to be in close contact with battery assembly 40 . . However, the present invention does not specify a structure or method for adhering the potting resin 7 to the secondary battery cell 1 of the battery assembly 40, the battery holder 44, or the like. The battery holder can be provided with a space to be filled with the potting resin, or the battery assembly can be placed in a housing to be filled with the potting resin. The potting resin 7 widens the heat-conducting area that is in close contact with the battery surface of the battery assembly 40 , and can effectively dissipate the heat from the secondary battery cell 1 . The uncured potting resin 7 is in a liquid state and enters even narrow gaps when filled. Then, it is brought into close contact with the surface of the secondary battery cell 1 .

この電源装置１００は、未硬化で液状のポッティング樹脂７を充填する工程で、絶縁スペース６にポッティング樹脂７が流入すると、排出弁の排出口をポッティング樹脂７が塞いで噴出ガスの排出を阻害する。ポッティング樹脂７が排出口から電池内部に浸入すると、排出弁の正常な動作が阻害される。二次電池セル１は、内圧が異常に高くなると排出弁を開いて二次電池セル１の破裂を防止するので、噴出ガスをスムーズに排出できない構造は、高い安全性は確保できない。
（閉塞カバー６１）In the power supply device 100, when the potting resin 7 flows into the insulating space 6, the potting resin 7 blocks the discharge port of the discharge valve in the process of filling the uncured liquid potting resin 7, thereby inhibiting the discharge of the ejected gas. . If the potting resin 7 enters the inside of the battery through the discharge port, normal operation of the discharge valve is hindered. When the internal pressure of the secondary battery cell 1 becomes abnormally high, the discharge valve is opened to prevent the secondary battery cell 1 from rupturing.
(Blocking cover 61)

電源装置１００は、ポッティング樹脂７が排出弁の排出口を閉塞しないように、絶縁スペース６に閉塞カバー６１を配置している。電源装置１００の閉塞カバー６１は、図１～図５に示すように、絶縁スペース６の外周部を閉塞する外周枠部６２を有し、この外周枠部６２でポッティング樹脂７の絶縁スペース６への注入を阻止して、ポッティング樹脂７を外周枠部６２の外側に充填して、外周枠部６２の内側に排気チャンバー６３を設けて、排気チャンバー６３に排出弁の排出口を露出させている。外周枠部６２は、絶縁スペース６の外周縁部に沿って伸びる形状で、電池ユニット４０Ａの端面に隙間なく密着して、絶縁スペース６にポッティング樹脂７が流入するのを阻止している。この構造の閉塞カバー６１は、外周枠部６２の内側に大容積の排気チャンバー６３を設けて、ここに噴出ガスを噴射できるので、噴出ガスをスムーズに排出できる特徴がある。それは、大容積の排気チャンバー６３は、排出弁の排出口から噴射される噴出ガスによる内圧上昇が緩慢で排気抵抗の上昇勾配を緩やかにできるからである。 The power supply device 100 has a blocking cover 61 arranged in the insulating space 6 so that the potting resin 7 does not block the discharge port of the discharge valve. As shown in FIGS. 1 to 5, the closing cover 61 of the power supply device 100 has an outer peripheral frame portion 62 that closes the outer peripheral portion of the insulating space 6. The outer peripheral frame portion 62 allows the potting resin 7 to reach the insulating space 6. is blocked, the potting resin 7 is filled outside the outer peripheral frame portion 62, an exhaust chamber 63 is provided inside the outer peripheral frame portion 62, and the exhaust port of the exhaust valve is exposed in the exhaust chamber 63. . The outer peripheral frame portion 62 has a shape extending along the outer peripheral edge of the insulating space 6 , and tightly adheres to the end surface of the battery unit 40</b>A to prevent the potting resin 7 from flowing into the insulating space 6 . The blocking cover 61 having this structure has a large-capacity exhaust chamber 63 provided inside the outer peripheral frame portion 62, into which the ejected gas can be ejected, so that the ejected gas can be discharged smoothly. This is because the large-capacity exhaust chamber 63 causes a gradual increase in internal pressure due to the gas ejected from the exhaust port of the exhaust valve, so that the slope of increase in exhaust resistance can be moderated.

閉塞カバー６１は、排出弁から排出される噴出ガスで溶融する独立気泡を有する絶縁材の発泡体で成形される。噴出ガスで溶融される閉塞カバー６１の溶融温度は、たとえば１００℃以上であって５００℃以下、好ましくは２００℃以上であって４００℃以下とする。溶融温度の低い閉塞カバー６１は、噴出ガスで速やかに溶融して噴出ガスを絶縁スペース６の外部に排出し、溶融温度の高い閉塞カバー６１は、使用状態において確実に絶縁スペース６を閉塞できる。閉塞カバー６１の溶融温度が低すぎると、電池温度で溶融し、あるいは変形し、また高すぎると噴出ガスで速やかに溶融できなくなる。したがって、閉塞カバー６１の溶融温度は、噴出ガスでは速やかに溶融し、かつ噴出ガスが噴射されない状態では変形したり溶融しない温度特性を考慮して、先述の範囲に設定される。 The closing cover 61 is formed of an insulating foam having closed cells that are melted by the gas discharged from the discharge valve. The melting temperature of the closing cover 61 melted by the ejected gas is, for example, 100° C. or higher and 500° C. or lower, preferably 200° C. or higher and 400° C. or lower. The closing cover 61 with a low melting temperature melts quickly with the ejected gas and discharges the ejected gas to the outside of the insulating space 6, while the closing cover 61 with a high melting temperature can reliably close the insulating space 6 in use. If the melting temperature of the blocking cover 61 is too low, it will melt or deform at the battery temperature. Therefore, the melting temperature of the blocking cover 61 is set within the range described above, taking into consideration the temperature characteristics of the closing cover 61, which melts quickly with the ejected gas and does not deform or melt when the ejected gas is not injected.

噴出ガスで溶融する閉塞カバー６１は、液状のポッティング樹脂７を充填する工程では溶融されずにポッティング樹脂７の絶縁スペース６への流入を阻止し、開弁した排出弁から噴射される高温の噴出ガスで溶融される。溶融された閉塞カバー６１は絶縁スペース６を外部に開放して、流入される噴出ガスを図２及び図３の矢印で示すように、絶縁スペース６から排出する。絶縁材の閉塞カバー６１は、電池ユニット４０Ａの端部電極１３側に密着して、絶縁スペース６を閉塞できる。とくに、端部電極１３側には金属板のリード板４５を配置しているので、絶縁材の閉塞カバー６１はリード板４５に密着して、リード板４５を短絡することなく絶縁スペース６を閉塞できる。さらに、独立気泡を有する発泡体の閉塞カバー６１は、単位体積に対する重量が小さく、密度が低くできるので、高温の噴出ガスで速やかに溶融されて、噴出ガスを絶縁スペース６から速やかに外部に排出できる特徴がある。さらに発泡体の閉塞カバー６１は、成形時の発泡倍率をコントロールしてより低比重化できるので、噴出ガスによる溶融時間を極めて短縮することができる。 The closing cover 61 melted by the jetting gas is not melted in the process of filling the liquid potting resin 7 and prevents the potting resin 7 from flowing into the insulating space 6, thereby preventing the high-temperature jetting from the opened discharge valve. It is melted by gas. The closed cover 61 that has been melted opens the insulating space 6 to the outside and discharges the injected gas from the insulating space 6 as indicated by the arrows in FIGS. 2 and 3 . A closing cover 61 made of an insulating material can close the insulating space 6 by closely contacting the end electrode 13 side of the battery unit 40A. In particular, since the lead plate 45 made of a metal plate is arranged on the end electrode 13 side, the closing cover 61 made of an insulating material adheres to the lead plate 45 and closes the insulating space 6 without short-circuiting the lead plate 45 . can. Furthermore, since the block cover 61 made of foam having closed cells has a small weight per unit volume and a low density, it is quickly melted by the high-temperature ejected gas, and the ejected gas is quickly discharged from the insulating space 6 to the outside. There are features that can Furthermore, since the closing cover 61 made of foam can be made to have a lower specific gravity by controlling the foaming ratio at the time of molding, it is possible to greatly shorten the melting time by the ejected gas.

閉塞カバー６１は、ゴム状弾性体の発泡体で成形している。ゴム状弾性体の閉塞カバー６１は、たとえば合成ゴム発泡体や軟質のプラスチック発泡体で成形される。合成ゴム発泡体はプロピレンゴムが使用できる。軟質のプラスチック発泡体には、たとえば軟質ウレタン発泡体が使用できる。ゴム状弾性体の閉塞カバー６１は、一対の電池ユニット４０Ａの間に配置し、両側の電池ユニット４０Ａで押圧し、圧縮される状態に弾性変形させることで、電池ユニット４０Ａの対向面４０ａに密着する。電池ユニット４０Ａの対向面４０ａに密着する閉塞カバー６１は、絶縁スペース６に注入される液状のポッティング樹脂７が絶縁スペース６に浸入するのを確実に阻止できる特徴がある。とくに、絶縁スペース６との対向面４０ａにリード板４５を固定している電池ユニット４０Ａは、リード板４５によって対向面４０ａに凹凸や隙間ができるが、弾性変形して密着する閉塞カバー６１は、凹凸を吸収し、隙間を閉塞してポッティング樹脂７の絶縁スペース６への浸入を確実に阻止できる特徴がある。さらに、独立気泡を有する発泡体からなるゴム状弾性体の閉塞カバー６１は、無数の気泡でより柔軟化されて変形できる自由度が大きくなり、凹凸のある電池ユニット４０Ａの対向面４０ａに隙間なく密着し、また隙間を閉塞して絶縁スペース６へのポッティング樹脂７の流入をより確実に阻止できる特徴がある。さらに、ゴム状弾性体の発泡体からなる閉塞カバー６１は、弾性変形して電池ユニット４０Ａの対向面４０ａに密着する状態で、電池ユニット４０Ａの対向面４０ａの押圧力を小さくできる。したがって、電池ユニット４０Ａの対向面４０ａに密着しながら、電池ユニット４０Ａに無理な応力を作用させることなく、絶縁スペース６を確実に閉塞できる特徴がある。 The blocking cover 61 is molded from a rubber-like elastic foam. The rubber-like elastic blocking cover 61 is made of synthetic rubber foam or soft plastic foam, for example. Propylene rubber can be used as the synthetic rubber foam. A soft plastic foam can be, for example, a soft urethane foam. The closing cover 61 made of a rubber-like elastic material is placed between the pair of battery units 40A, pressed by the battery units 40A on both sides, and elastically deformed into a compressed state, thereby closely contacting the facing surfaces 40a of the battery units 40A. do. The closing cover 61 that is in close contact with the facing surface 40 a of the battery unit 40 A has the characteristic that it can reliably prevent the liquid potting resin 7 injected into the insulating space 6 from entering the insulating space 6 . In particular, in the battery unit 40A in which the lead plate 45 is fixed to the facing surface 40a with the insulating space 6, the lead plate 45 creates irregularities and gaps on the facing surface 40a. It has the characteristic of being able to absorb unevenness and close gaps to reliably prevent the potting resin 7 from entering the insulating space 6 . Further, the rubber-like elastic blocking cover 61 made of a foam having closed cells is made more flexible by the numerous cells, and has a greater degree of freedom in deformation, so that it is possible to cover the facing surface 40a of the uneven battery unit 40A without gaps. It has a feature that it can more reliably prevent the potting resin 7 from flowing into the insulating space 6 by closely contacting and closing the gap. Furthermore, the blocking cover 61 made of rubber-like elastic foam can reduce the pressing force on the facing surface 40a of the battery unit 40A in a state of being elastically deformed and in close contact with the facing surface 40a of the battery unit 40A. Therefore, there is a feature that the insulating space 6 can be reliably closed without exerting excessive stress on the battery unit 40A while adhering to the facing surface 40a of the battery unit 40A.

ただ、本発明の電源装置は、閉塞カバー６１を必ずしもゴム状弾性体で成形する必要はない。それは、閉塞カバー６１と電池ユニット４０Ａの対向面４０ａとの間に弾性変形するパッキンを配置し、あるいはシール材を塗布して、閉塞カバー６１を電池ユニット４０Ａの対向面４０ａに隙間なく密着することができるからである。 However, in the power supply device of the present invention, the blocking cover 61 does not necessarily have to be made of a rubber-like elastic material. That is, an elastically deformable packing is arranged between the blocking cover 61 and the facing surface 40a of the battery unit 40A, or a sealing material is applied so that the blocking cover 61 is tightly attached to the facing surface 40a of the battery unit 40A. This is because

図２、図４、及び図５の電源装置１００は、閉塞カバー６１の外周枠部６２の表面と耐熱シート６４の表面とに絶縁シート６５を積層している。絶縁シート６５はプラスチック製で、耐熱シート６４の両面に閉塞カバー６１を配置して、耐熱シート６４と両側の閉塞カバー６１とを一体構造に連結して、絶縁スペース６に配設される板状の絶縁スペーサ６０としている。絶縁スペーサ６０は、一対の電池ユニット４０Ａに間に挟む状態で配置されて、閉塞カバー６１と耐熱シート６４とを絶縁スペース６の定位置に配置する。したがって、この構造は組み立て工程を簡単にして能率よく多量生産して、耐熱シート６４と閉塞カバー６１とを正確な位置に配置できる特徴がある。 2, 4, and 5, the insulating sheet 65 is laminated on the surface of the outer peripheral frame portion 62 of the blocking cover 61 and the surface of the heat-resistant sheet 64. As shown in FIG. The insulating sheet 65 is made of plastic, and the blocking covers 61 are arranged on both sides of the heat-resistant sheet 64 . is an insulating spacer 60 of . The insulating spacer 60 is arranged in a state sandwiched between the pair of battery units 40</b>A, and arranges the blocking cover 61 and the heat-resistant sheet 64 at fixed positions in the insulating space 6 . Therefore, this structure is characterized by simplifying the assembly process, efficiently mass-producing, and arranging the heat-resistant sheet 64 and the closing cover 61 at accurate positions.

図１～図３の電源装置１００は、閉塞カバー６１に外周枠部６２を設けて、外周枠部６２の内側に排気チャンバー６３を設けているが、閉塞カバー６１はこの形状に特定するものでない。たとえば、図示しないが、閉塞カバーは、二次電池セルの排出弁の排出口との対向面に凹部を設けた板状の発泡体に成形し、あるいは、絶縁スペースに隙間なく配設されて、排気チャンバーを設けない板状に成形して排出弁の排出口を塞ぐこともできる。これ等の形状の閉塞カバー６１は、発泡体の発泡倍率を高くして閉塞カバー内部の空隙率を高くし、また溶融温度を低くして高温の噴出ガスによる溶融時間を短縮して、絶縁スペースに噴射される噴出ガスを速やかに外部に排出する。 In the power supply device 100 of FIGS. 1 to 3, the closing cover 61 is provided with the outer peripheral frame portion 62, and the exhaust chamber 63 is provided inside the outer peripheral frame portion 62, but the closing cover 61 is not limited to this shape. . For example, although not shown, the blocking cover is molded into a plate-like foam having a concave portion on the surface facing the discharge port of the discharge valve of the secondary battery cell, or is disposed in the insulating space without gaps, It is also possible to block the discharge port of the discharge valve by molding it into a plate-like shape without an exhaust chamber. The blocking cover 61 having such a shape increases the expansion ratio of the foam to increase the porosity inside the blocking cover, and also lowers the melting temperature to shorten the melting time by the high temperature jet gas, thereby reducing the insulating space. quickly discharges the ejected gas to the outside.

本発明の電源装置は、内蔵する二次電池セルの熱暴走の誘発を防止して高い安全性が要求される用途に便利に使用される。 INDUSTRIAL APPLICABILITY The power supply device of the present invention can be conveniently used in applications requiring high safety by preventing induction of thermal runaway of built-in secondary battery cells.

１００…電源装置
１…二次電池セル
６…絶縁スペース
７…ポッティング樹脂
９…外装ケース
１３…端部電極
１３Ａ…第１の端部電極
１３Ｂ…第２の端部電極
４０…電池集合体
４０Ａ…電池ユニット
４０ａ…対向面
４４…電池ホルダ
４４Ａ…挿入部
４４Ｂ…開口部
４５…リード板
６０…絶縁スペーサ
６１…閉塞カバー
６２…外周枠部
６３…排気チャンバー
６４…耐熱シート
６５…絶縁シート
７５…防水袋
１０１…電池セル
１３２…区画壁
１３３…中空部
１０７…ポッティング樹脂
DESCRIPTION OF SYMBOLS 100... Power supply device 1... Secondary battery cell 6... Insulation space 7... Potting resin 9... Outer case 13... End electrode 13A... First end electrode 13B... Second end electrode 40... Battery assembly 40A... Battery unit 40a Opposing surface 44 Battery holder 44A Insertion part 44B Opening 45 Lead plate 60 Insulating spacer 61 Closing cover 62 Peripheral frame 63 Exhaust chamber 64 Heat-resistant sheet 65 Insulating sheet 75 Waterproof Bag 101 Battery cell 132 Partition wall 133 Hollow part 107 Potting resin

Claims (11)

設定圧力で開弁する排出弁の開口部を端面に配置してなる複数の電池セルを平行姿勢であって両端を同一平面に配置してなる電池ユニットが、絶縁スペースを介して前記電池セルの端面を対向して配置して、前記絶縁スペースに排出弁の排出口を配置してなる電池集合体を備え、
前記絶縁スペースの中間に、前記排出弁の排出口から排出される噴出ガスで溶融されない耐熱シートが前記電池セルの端面と平行な姿勢で配置され、
さらに、前記耐熱シートの両面に噴出ガスの排気チャンバーを設けてなり、
前記耐熱シートが、排出される噴出ガスで変形する可撓性シートとしてなることを特徴とする電源装置。 A battery unit in which a plurality of battery cells, each of which has an opening of a discharge valve that opens at a set pressure and is arranged on the end face thereof, is arranged in parallel and both ends are arranged on the same plane. A battery assembly in which the end faces are arranged to face each other and the discharge port of the discharge valve is arranged in the insulating space,
A heat-resistant sheet that is not melted by the ejected gas discharged from the discharge port of the discharge valve is arranged in the middle of the insulating space in a posture parallel to the end surface of the battery cell,
Furthermore, an exhaust chamber for ejecting gas is provided on both sides of the heat-resistant sheet ,
A power supply device , wherein the heat-resistant sheet is a flexible sheet that is deformed by the ejected gas . 請求項１に記載される電源装置であって、
前記耐熱シートの両側に、前記絶縁スペースの外周部に沿う枠形状の閉塞カバーを配置して、該耐熱シートと前記電池ユニットとの間に前記排気チャンバーを形成してなる電源装置。 A power supply device according to claim 1,
A power supply device comprising a frame-shaped closing cover arranged along the outer periphery of the insulating space on both sides of the heat-resistant sheet, and forming the exhaust chamber between the heat-resistant sheet and the battery unit. 請求項２に記載される電源装置であって、
前記閉塞カバーが、前記絶縁スペースの外周部を閉塞する外周枠部を有し、前記外周枠部の内側に排気チャンバーが設けられ、前記排気チャンバーに前記排出弁の排出口が開口されてなることを特徴とする電源装置。 A power supply device according to claim 2 ,
The closing cover has an outer peripheral frame portion that closes the outer peripheral portion of the insulating space, an exhaust chamber is provided inside the outer peripheral frame portion, and an exhaust port of the exhaust valve is opened in the exhaust chamber. A power supply, characterized by: 設定圧力で開弁する排出弁の開口部を端面に配置してなる複数の電池セルを平行姿勢であって両端を同一平面に配置してなる電池ユニットが、絶縁スペースを介して前記電池セルの端面を対向して配置して、前記絶縁スペースに排出弁の排出口を配置してなる電池集合体を備え、
前記絶縁スペースの中間に、前記排出弁の排出口から排出される噴出ガスで溶融されない耐熱シートが前記電池セルの端面と平行な姿勢で配置され、
さらに、前記耐熱シートの両面に噴出ガスの排気チャンバーを設けてなり、
前記電池集合体に密着してなるポッティング樹脂を備えると共に、
前記絶縁スペースに電池セルの排出弁の排出口を塞ぐ閉塞カバーが配置され、
前記閉塞カバーが前記電池セルの排出弁から排出される噴出ガスで溶融する独立気泡を有する絶縁材の発泡体で、
前記閉塞カバーが、前記ポッティング樹脂の前記排出弁の開口部への流入を阻止し、かつ前記排出弁からの噴出ガスで溶融して噴出ガスを通過させるようにしてなることを特徴とする電源装置。 A battery unit in which a plurality of battery cells, each of which has an opening of a discharge valve that opens at a set pressure and is arranged on the end face thereof, is arranged in parallel and both ends are arranged on the same plane. A battery assembly in which the end faces are arranged to face each other and the discharge port of the discharge valve is arranged in the insulating space,
A heat-resistant sheet that is not melted by the ejected gas discharged from the discharge port of the discharge valve is arranged in the middle of the insulating space in a posture parallel to the end surface of the battery cell,
Furthermore, an exhaust chamber for ejecting gas is provided on both sides of the heat-resistant sheet,
A potting resin is provided in close contact with the battery assembly,
A blocking cover is disposed in the insulating space to block the discharge port of the discharge valve of the battery cell,
The closing cover is an insulating foam having closed cells that are melted by the gas ejected from the discharge valve of the battery cell,
The power supply device is characterized in that the blocking cover prevents the potting resin from flowing into the opening of the discharge valve and is melted by the gas discharged from the discharge valve to allow the discharged gas to pass through. . 請求項４に記載される電源装置であって、
前記閉塞カバーが、前記絶縁スペースの外周部を閉塞する外周枠部を有し、前記ポッティング樹脂が前記外周枠部の外側に充填されると共に、前記外周枠部の内側に排気チャンバーが設けられ、前記排気チャンバーに前記排出弁の排出口が開口されてなることを特徴とする電源装置。 A power supply device according to claim 4 ,
The closing cover has an outer peripheral frame portion that closes the outer peripheral portion of the insulating space, the potting resin is filled outside the outer peripheral frame portion, and an exhaust chamber is provided inside the outer peripheral frame portion, A power supply device, wherein an exhaust port of the exhaust valve is opened in the exhaust chamber. 請求項２ないし５のいずれかに記載される電源装置であって、
前記閉塞カバーがゴム状弾性体の絶縁材としてなることを特徴とする電源装置。 The power supply device according to any one of claims 2 to 5 ,
A power supply device, wherein the closing cover is an insulating material made of a rubber-like elastic material. 請求項２ないし６のいずれかに記載される電源装置であって、
前記閉塞カバーが、前記耐熱シートと前記電池ユニットとの間に挟まれて配置されてなることを特徴とする電源装置。 The power supply device according to any one of claims 2 to 6 ,
A power supply device, wherein the closing cover is sandwiched between the heat-resistant sheet and the battery unit. 請求項２ないし７のいずれかに記載される電源装置であって、
前記閉塞カバーが、合成ゴムと軟質プラスチックの何れかの発泡体であることを特徴とする電源装置。 The power supply device according to any one of claims 2 to 7 ,
A power supply device, wherein the closing cover is a synthetic rubber or soft plastic foam. 請求項２ないし８のいずれかに記載される電源装置であって、
前記耐熱シートの表面に絶縁シートが積層され、前記絶縁シートが前記耐熱シートと、前記耐熱シートの両面に配置している閉塞カバーとを一体構造に連結してなることを特徴とする電源装置。 The power supply device according to any one of claims 2 to 8 ,
A power supply device, wherein an insulating sheet is laminated on the surface of the heat-resistant sheet, and the insulating sheet connects the heat-resistant sheet and closing covers arranged on both sides of the heat-resistant sheet in an integrated structure. 請求項１ないし９のいずれかに記載される電源装置であって、
前記耐熱シートが耐熱紙であることを特徴とする電源装置。 The power supply device according to any one of claims 1 to 9 ,
A power supply device, wherein the heat-resistant sheet is heat-resistant paper. 請求項１ないし１０のいずれかに記載される電源装置であって、
前記耐熱シートの耐熱温度が５００℃以上であることを特徴とする電源装置。 A power supply device according to any one of claims 1 to 10 ,
A power supply device, wherein the heat-resistant sheet has a heat-resistant temperature of 500° C. or more.
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