JP2009037818A - Battery - Google Patents

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JP2009037818A
JP2009037818A JP2007200254A JP2007200254A JP2009037818A JP 2009037818 A JP2009037818 A JP 2009037818A JP 2007200254 A JP2007200254 A JP 2007200254A JP 2007200254 A JP2007200254 A JP 2007200254A JP 2009037818 A JP2009037818 A JP 2009037818A
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Prior art keywords
battery
electrode body
wound electrode
battery container
wound
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Tomohiro Matsuura
智浩 松浦
Satoru Suzuki
哲 鈴木
Toshimi Kawase
聡美 川瀬
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Toyota Motor Corp
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Toyota Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Gas Exhaust Devices For Batteries (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery which can protect a battery case from a high temperature gas generated at the time of battery abnormality while securing excellently insertion of an electrode unit into the battery case. <P>SOLUTION: The battery 100 is provided with a battery container 40, a wound electrode unit 70 housed in the battery container through an opening part 42 of the battery container, electrode terminals 20A, 20B jointed to end parts 72A, 72B in winding axis direction of the wound electrode unit, and a lid 44 to close the opening part of the battery container. Shield plates 10A, 10B to separate the wound electrode unit and the inner wall of the battery container are arranged between the end faces 73A, 73B in winding axis direction of the wound electrode unit and the inner wall of the battery container opposed to the end faces. The shield plates are formed integrated with the electrode terminals or the lid. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、電池に関する。詳しくは、車両搭載用として好適な電池の構造に関する。   The present invention relates to a battery. Specifically, the present invention relates to a battery structure suitable for mounting on a vehicle.

近年、リチウムイオン電池、ニッケル水素電池その他の二次電池は、車両搭載用電源、或いはパソコンおよび携帯端末の電源として重要性が高まっている。特に、軽量で高エネルギー密度が得られるリチウムイオン電池は、車両搭載用高出力電源として好ましく用いられるものとして期待されている。   In recent years, lithium-ion batteries, nickel-metal hydride batteries, and other secondary batteries have become increasingly important as power sources for vehicles or as power sources for personal computers and portable terminals. In particular, a lithium ion battery that is lightweight and obtains a high energy density is expected to be preferably used as a high-output power source mounted on a vehicle.

ところで、この種の電池においては、電池異常時（例えば変形等による内部短絡や過大電圧による過充電がなされた場合）に電池ケース内の電解液が揮発・分解してガスが発生する場合がある。このガスが外部に放出されずに電池ケース内に留まると、電池内圧が上昇するため、電池ケースが膨張変形し得、電池自体や電池を搭載している機器の破損等を生じる虞がある。したがって、電池異常時に発生した高温ガスを、電池外部へと速やかに排出する方法が求められている。   By the way, in this type of battery, when the battery is abnormal (for example, when internal short circuit due to deformation or overcharge due to excessive voltage), the electrolyte in the battery case may volatilize and decompose to generate gas. . If the gas stays in the battery case without being released to the outside, the internal pressure of the battery rises, so that the battery case may expand and deform, which may cause damage to the battery itself or a device on which the battery is mounted. Therefore, there is a demand for a method for quickly discharging the high temperature gas generated when the battery is abnormal to the outside of the battery.

電池内で発生した高温ガスを外部へと速やかに排出する方法として、電池ケースにガス抜き孔を設け、破裂板で密封して電池内圧上昇時に破裂板が破れ、電池内圧を外部に安全に開放する方法が開示されている。例えば特許文献１には、帯状の正極板と負極板とがセパレータを介して長円渦巻状に捲回してなる渦巻電極群を角型電池ケースに収容し、ガス抜き孔を、渦巻電極群の捲回面を角型電池ケース上に投影した面内に設置した角型密閉式電池が開示されている。この構成によれば、電極群内に発生するガスは捲回方向に沿って電池外へと放出される。
この種の他の従来技術として例えば特許文献２が挙げられる。また、特許文献３には、電池ケースの内周に隔壁部材を設け、そこに渦巻電極体を収納した電池構造が開示されている。
特開平７−２９６７９０号公報 特開２００６−２１００３１号公報 特開２００２−１００３２８号公報 As a method of quickly discharging the high-temperature gas generated in the battery to the outside, a vent hole is provided in the battery case and sealed with a rupture plate. When the internal pressure of the battery rises, the rupture plate is broken and the battery internal pressure is safely released to the outside. A method is disclosed. For example, in Patent Document 1, a spiral electrode group in which a strip-like positive electrode plate and a negative electrode plate are wound in an oval spiral shape through a separator is accommodated in a rectangular battery case, and a gas vent hole is formed in the spiral electrode group. A prismatic sealed battery is disclosed that is installed in a plane in which a winding surface is projected onto a prismatic battery case. According to this configuration, the gas generated in the electrode group is released out of the battery along the winding direction.
For example, Patent Document 2 is cited as another conventional technique of this type. Patent Document 3 discloses a battery structure in which a partition wall member is provided on the inner periphery of a battery case and a spiral electrode body is accommodated therein.
JP-A-7-296790 JP 2006-210031 A JP 2002-100328 A

しかしながら、特許文献１に記載されるように、電池ケース内側側面と渦巻電極群の捲回面とが対向するように配置されている場合、当該捲回面から噴出されたガスが電池ケース内側側面に直接当たることとなる。例えばリチウムイオン電池では、上記のような電池異常時に電極体から発生するガスは非常に高温高圧な状態となっている場合があり、その熱や圧で電池ケースが破損する虞もある。
上記問題を解決するため、電池ケースの内周に隔壁部材を配置し、噴出した高温ガスが電池ケースに直接当たらないように構成することも考えられる。しかし、隔壁部材を配置する分だけ電極体の電池ケースへの挿入性（収容性）が悪化することが懸念される。
本発明は、かかる点に鑑みてなされたものであり、その主な目的は、電極体の電池ケースへの良好な挿入性を確保しつつ、上記のような電池異常時に発生した高温ガスから電池ケースを保護し得る電池を提供することである。 However, as described in Patent Document 1, when the battery case inner side surface and the winding surface of the spiral electrode group are arranged to face each other, the gas ejected from the winding surface is the battery case inner side surface. It will hit directly. For example, in a lithium ion battery, the gas generated from the electrode body when the battery is abnormal as described above may be in a very high temperature and high pressure state, and the battery case may be damaged by the heat or pressure.
In order to solve the above problem, it is also conceivable that a partition member is disposed on the inner periphery of the battery case so that the jetted high temperature gas does not directly hit the battery case. However, there is a concern that the insertion property (accommodability) of the electrode body into the battery case is deteriorated by the amount of the partition member.
The present invention has been made in view of such a point, and the main object of the present invention is to provide a battery from a high-temperature gas generated when the battery is abnormal as described above, while ensuring good insertability of the electrode body into the battery case. It is to provide a battery that can protect the case.

本発明によって提供される電池は、電池容器と、その電池容器の開口部を介して電池容器に収容される捲回電極体と、捲回電極体の捲回軸方向における端部に接合される電極端子と、電池容器の開口部を塞ぐ蓋体とを備えている。そして、上記捲回電極体の捲回軸方向における端面と当該端面に対向する上記電池容器の内壁との間には、当該捲回電極体端面と電池容器内壁とを隔てる遮蔽板が設けられている。ここで、その遮蔽板は、上記電極端子または上記蓋体と一体に形成されていることを特徴とする。   The battery provided by the present invention is joined to the battery container, the wound electrode body accommodated in the battery container through the opening of the battery container, and the end of the wound electrode body in the winding axis direction. An electrode terminal and a lid for closing the opening of the battery container are provided. A shielding plate is provided between the end face of the wound electrode body in the winding axis direction and the inner wall of the battery container facing the end face to separate the wound electrode body end face from the battery container inner wall. Yes. Here, the shielding plate is formed integrally with the electrode terminal or the lid.

このように、捲回電極体の捲回軸方向における端面（即ち開放された捲回巻き口を構成する面）と当該端面に対向する電池容器内壁との間に遮蔽板を介在させることにより、電池異常時に、当該捲回電極体端面から噴出したガスが、対向する電池容器に直接（即ち高温高圧の状態を維持したまま）当たることを回避することができる。このことにより、電池容器の損傷を防止することができる。その結果、所定の品質を長期間維持し得る高信頼性の電池を提供することができる。また、遮蔽板は、電極端子または蓋体と一体に形成されているので、遮蔽板と捲回電極体との位置決めが容易となり、異常時のガス噴出し口となり得る捲回電極体の端面（捲回巻き口）を遮蔽板で確実に覆うことができる。さらに、遮蔽板と捲回電極体との位置合わせを別途行う必要もなく、遮蔽板の配置による電池の製造工程の煩雑化を防止することができる。   Thus, by interposing the shielding plate between the end surface in the winding axis direction of the wound electrode body (that is, the surface constituting the opened wound winding port) and the battery container inner wall facing the end surface, When the battery is abnormal, it can be avoided that the gas ejected from the end face of the wound electrode body directly hits the opposing battery container (that is, while maintaining the high temperature and high pressure state). This can prevent the battery container from being damaged. As a result, a highly reliable battery that can maintain a predetermined quality for a long period of time can be provided. Further, since the shielding plate is formed integrally with the electrode terminal or the lid body, positioning of the shielding plate and the wound electrode body is facilitated, and the end face of the wound electrode body (which can be a gas ejection port at the time of abnormality) It is possible to reliably cover the wound winding opening) with a shielding plate. Furthermore, it is not necessary to separately align the shielding plate and the wound electrode body, and the manufacturing process of the battery due to the arrangement of the shielding plate can be prevented.

なお、上記遮蔽板と捲回電極体との間に隙間ができるように当該遮蔽板が配置されていることが好ましい。遮蔽板と捲回電極体との間に隙間が設けられていることにより、当該隙間を介して捲回電極体内で発生したガスを電極体内部から抜け易くすることができ、捲回電極体の膨張を防止することができる。   In addition, it is preferable that the said shielding board is arrange | positioned so that a clearance gap may be made between the said shielding board and the winding electrode body. By providing a gap between the shielding plate and the wound electrode body, gas generated in the wound electrode body can be easily released from the inside of the electrode body through the gap. Expansion can be prevented.

ここで開示される電池のある好適な一態様において、上記捲回電極体は、上記開口部を介して捲回軸方向と直交する方向に電池容器に収容されていることを特徴とする。即ち、捲回電極体は上記開口部を介して捲回軸方向と垂直方向に電池容器に挿入される。   In a preferable aspect of the battery disclosed herein, the wound electrode body is housed in a battery container in a direction orthogonal to the winding axis direction through the opening. That is, the wound electrode body is inserted into the battery container through the opening in a direction perpendicular to the winding axis direction.

上記構成では、電極端子または蓋体を介して捲回電極体と一体に組み付けられた遮蔽板を、捲回電極体を電池容器に収容する際のガイドとして利用することができる。典型的な一態様では、遮蔽板を電池容器の内壁に沿わせつつ、捲回電極体を電池容器に挿入することにより、捲回電極体の挿入性を良好にすることができる。また、挿入時に捲回電極体と電池容器とが直接干渉して捲回電極体が損傷するリスクを低減することもできる。   In the said structure, the shielding board integrally assembled | attached with the wound electrode body via the electrode terminal or the cover body can be utilized as a guide at the time of accommodating a wound electrode body in a battery container. In a typical embodiment, the insertion property of the wound electrode body can be improved by inserting the wound electrode body into the battery container while keeping the shielding plate along the inner wall of the battery container. In addition, the risk of the wound electrode body being damaged due to direct interference between the wound electrode body and the battery container during insertion can also be reduced.

なお、上記遮蔽板は、樹脂材料やセラミックで構成してよい。これにより、金属製の遮蔽板を用いる場合に比べて、低コスト化、軽量化を図ることができ、また、遮蔽板の形状の自由度を高めることが可能となる。なお、樹脂製の遮蔽板が採用される場合は、通常のインサート成形等によって電極端子または蓋体と容易に一体に形成することができる。   The shielding plate may be made of a resin material or ceramic. Thereby, compared with the case where a metal shielding board is used, cost reduction and weight reduction can be achieved, and it becomes possible to raise the freedom degree of the shape of a shielding board. When a resin shielding plate is employed, it can be easily formed integrally with the electrode terminal or the lid body by ordinary insert molding or the like.

以下、図面を参照しながら、本発明による実施の形態を説明する。以下の図面においては、同じ作用を奏する部材・部位には同じ符号を付して説明している。なお、以下、角形リチウムイオン二次電池１００を例にして本発明の電池の構造について詳細に説明するが、本発明をかかる実施形態に記載されたものに限定することを意図したものではない。また、各図における寸法関係（長さ、幅、厚さ等）は実際の寸法関係を反映するものではない。   Embodiments according to the present invention will be described below with reference to the drawings. In the following drawings, members / parts having the same action are described with the same reference numerals. Hereinafter, the structure of the battery of the present invention will be described in detail by taking the prismatic lithium ion secondary battery 100 as an example, but the present invention is not intended to be limited to the one described in the embodiment. In addition, the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect actual dimensional relationships.

第１の実施形態のリチウムイオン二次電池１００（以下「電池」とも称する）は、従来の電池と同様、典型的には所定の電池構成材料（正負極それぞれの活物質、正負極それぞれの集電体、セパレータ等）を具備する捲回電極体７０と、該捲回電極体７０および適当な電解液を収容する電池容器４０とを備える。   The lithium ion secondary battery 100 (hereinafter also referred to as “battery”) of the first embodiment typically has a predetermined battery constituent material (active material for each positive and negative electrode, collection of each positive and negative electrode), as with a conventional battery. A wound electrode body 70 including an electric body, a separator, and the like, and a battery container 40 that accommodates the wound electrode body 70 and an appropriate electrolytic solution.

一例として図１および図２に示すように、ここで開示されるリチウムイオン二次電池１００は、後述する扁平形状の捲回電極体７０を収容し得る形状（本実施形態では図示するような六面体形状即ち角形）の電池容器４０を備える。電池容器４０の材質（ここではアルミニウム製）は従来の電池で使用されるものと同じであればよく特に制限はない。電池容器４０は、図２に示すように、その一端（この例では上端）に開口部４２を有しており、捲回電極体７０は、開口部４２を介して電池容器４０に収容される。   As an example, as shown in FIGS. 1 and 2, a lithium ion secondary battery 100 disclosed herein has a shape (a hexahedron as illustrated in the present embodiment) that can accommodate a flat wound electrode body 70 described later. A battery container 40 having a shape (ie, a square shape). The material of the battery case 40 (here, made of aluminum) is not particularly limited as long as it is the same as that used in the conventional battery. As shown in FIG. 2, the battery container 40 has an opening 42 at one end (the upper end in this example), and the wound electrode body 70 is accommodated in the battery container 40 through the opening 42. .

本実施形態の捲回電極体７０は、その捲回軸方向が水平方向（図では左右方向）となるように電池容器４０に収容されている。また、電池容器４０の開口部４２は、捲回電極体７０を収容可能な開口面（ここでは略矩形状）を有しており、当該開口面は電池容器４０に収容された状態の捲回電極体７０の捲回軸方向に対して垂直方向（図示した例では鉛直上側の方）に形成されている。そのため、捲回電極体７０を電池容器４０に収容する際、捲回電極体７０は、捲回軸方向に対して垂直方向（図示した例では鉛直下向き）に挿入されることとなる。   The wound electrode body 70 of the present embodiment is accommodated in the battery container 40 so that the winding axis direction is the horizontal direction (left-right direction in the figure). Further, the opening 42 of the battery container 40 has an opening surface (here, substantially rectangular) that can accommodate the wound electrode body 70, and the opening surface is wound in a state of being accommodated in the battery container 40. The electrode body 70 is formed in a direction perpendicular to the winding axis direction (in the illustrated example, the upper side in the vertical direction). Therefore, when the wound electrode body 70 is accommodated in the battery container 40, the wound electrode body 70 is inserted in a direction perpendicular to the winding axis direction (vertically downward in the illustrated example).

電池容器４０の開口部４２は、図１に示すように蓋体４４によって塞がれている。蓋体４４は、電池容器４０と同じ材質で構成されており、この例では金属製（ここではアルミニウム製）である。蓋体４４の中央付近には、電池容器４０の内部で発生したガス抜きのための安全弁６０が従来の電池容器と同様に設けられている。この安全弁６０は、電池容器４０内の圧力が異常に上昇すると安全のために弁体（図示せず）が変形し、該弁体と電池容器４０との間に生じた隙間から内部のガス等が放出されるように構成されている。   The opening 42 of the battery container 40 is closed with a lid 44 as shown in FIG. The lid 44 is made of the same material as that of the battery container 40, and is made of metal (here, made of aluminum) in this example. In the vicinity of the center of the lid 44, a safety valve 60 for venting the gas generated inside the battery container 40 is provided in the same manner as the conventional battery container. The safety valve 60 has a valve body (not shown) that is deformed for safety when the pressure in the battery container 40 rises abnormally, and an internal gas or the like from a gap generated between the valve body and the battery container 40. Is configured to be released.

蓋体４４には、安全弁６０の他にも電極端子（正極端子２０Ａおよび負極端子２０Ｂ）が設けられている。正極端子２０Ａは、捲回電極体７０の正極と電気的に接続しており、負極端子２０Ｂは、捲回電極体７０の負極と電気的に接続している。本実施形態の正極端子２０Ａは、捲回電極体７０の捲回軸方向における一方の端部７２Ａに沿って延びたアルミニウム製の板状部材であり、その下部で端部７２Ａの扁平な表面に接合（ここでは超音波溶接）されている。一方、負極端子２０Ｂは、捲回電極体７０の捲回軸方向における他方の端部７２Ｂ（端部７２Ａの反対側の端部７２Ｂ）に沿って延びた銅製の板状部材であり、その下部で端部７２Ｂの扁平な表面に接合（ここではスポット溶接）されている。   In addition to the safety valve 60, the lid 44 is provided with electrode terminals (the positive terminal 20A and the negative terminal 20B). The positive electrode terminal 20 </ b> A is electrically connected to the positive electrode of the wound electrode body 70, and the negative electrode terminal 20 </ b> B is electrically connected to the negative electrode of the wound electrode body 70. The positive electrode terminal 20A of the present embodiment is an aluminum plate-like member extending along one end portion 72A in the winding axis direction of the wound electrode body 70, and on the flat surface of the end portion 72A at the lower portion thereof. Joined (here, ultrasonic welding). On the other hand, the negative electrode terminal 20B is a copper plate-like member extending along the other end portion 72B (end portion 72B opposite to the end portion 72A) in the winding axis direction of the wound electrode body 70. And joined to the flat surface of the end portion 72B (here, spot welding).

さらに、図３も加えてリチウムイオン二次電池１００の構成について説明する。捲回電極体７０の捲回軸方向における端面（即ち捲回巻き口）７３Ａ、７３Ｂと、対向する電池容器４０の内壁との間には、当該捲回電極体７０と電池容器４０とを隔てる遮蔽板１０Ａ、１０Ｂが配置されている。図示するように、この遮蔽板１０Ａ、１０Ｂは、捲回電極体７０の端面（巻き口）７３Ａ、７３Ｂと、対向する電池容器４０との間で当該端面７３Ａ、７３Ｂを覆うように（換言すれば対向する電池容器４０の内壁側からみて端面（捲回巻き口）７３Ａ、７３Ｂが遮蔽されるように）配置されている。   Further, the configuration of the lithium ion secondary battery 100 will be described with reference to FIG. The wound electrode body 70 and the battery container 40 are separated between end surfaces (that is, wound winding openings) 73A and 73B in the winding axis direction of the wound electrode body 70 and the inner wall of the opposite battery container 40. Shielding plates 10A and 10B are arranged. As shown in the figure, the shielding plates 10A and 10B cover the end surfaces 73A and 73B between the end surfaces (winding openings) 73A and 73B of the wound electrode body 70 and the opposite battery container 40 (in other words, For example, the end faces (winding winding openings) 73A and 73B are arranged as viewed from the inner wall side of the opposite battery container 40.

より具体的に説明する。図３等に示すように、本実施形態の遮蔽板１０Ａ、１０Ｂは、捲回電極体７０の捲回軸方向端面７３Ａ、７３Ｂのほぼ全域を遮蔽するように当該端面７３Ａ、７３Ｂに沿って図面上下方向に延びた略矩形状の板状部材である。遮蔽板１０Ａ、１０Ｂは、捲回電極体７０の捲回軸方向外側であって捲回電極体の端面７３Ａ、７３Ｂに対向するように配置され、これにより捲回電極体の端面７３Ａ、７３Ｂの上端から下端までを外側から覆っている。   This will be described more specifically. As shown in FIG. 3 and the like, the shielding plates 10A and 10B of the present embodiment are drawings along the end surfaces 73A and 73B so as to shield almost the entire region of the winding axis direction end surfaces 73A and 73B of the wound electrode body 70. It is a substantially rectangular plate-like member extending in the vertical direction. The shielding plates 10A and 10B are arranged on the outer side in the winding axis direction of the wound electrode body 70 so as to face the end faces 73A and 73B of the wound electrode body, and thereby the end faces 73A and 73B of the wound electrode body. It covers from the outside from the upper end to the lower end.

また、図３に示すように、本実施形態の遮蔽板１０Ａ、１０Ｂは、捲回電極体７０との間に隙間１２Ａ、１２Ｂを設けて配置されている。図示した例では、隙間１２Ａ、１２Ｂは、捲回電極体７０の端面７３Ａ、７３Ｂに沿って図面上下方向に延びており、当該端面７３Ａ、７３Ｂと遮蔽板１０Ａ、１０Ｂとの間を一定の幅だけ離す（距離を置く）ように形成されている。   Further, as shown in FIG. 3, the shielding plates 10 </ b> A and 10 </ b> B of the present embodiment are disposed with gaps 12 </ b> A and 12 </ b> B provided between the wound electrode bodies 70. In the illustrated example, the gaps 12A and 12B extend in the vertical direction of the drawing along the end surfaces 73A and 73B of the wound electrode body 70, and have a certain width between the end surfaces 73A and 73B and the shielding plates 10A and 10B. It is formed so as to be separated only by a distance.

本実施形態においては、遮蔽板１０Ａ、１０Ｂは、電極端子（正極端子２０Ａおよび負極端子２０Ｂ）と一体に形成されている。具体的には、本実施形態の遮蔽板１０Ａ、１０Ｂは、当該遮蔽板１０Ａ、１０Ｂの一側面からほぼ直角に折り曲がるように立ち上がった連結部２２Ａ、２２Ｂを介して電極端子（正極端子２０Ａおよび負極端子２０Ｂ）と一体に形成されている。即ち、本実施形態では、遮蔽板１０Ａ、１０Ｂの幅広な平面と電極端子２０Ａ、２０Ｂの幅広な平面とはほぼ直交する位置関係で配置される。
このような遮蔽板と電極端子との一体成形は、機械的接合を用いることなく容易に実行することができる。具体的には、図４に示す形状のアルミニウム板に対して曲げ加工を施すことにより、正極端子２０Ａと遮蔽板１０Ａとを一体成形することができる。負極側でも正極側と同様に、所定形状の銅板に曲げ加工を施すことにより負極端子２０Ｂと遮蔽板１０Ｂとを一体に形成することができる。 In the present embodiment, the shielding plates 10A and 10B are formed integrally with the electrode terminals (the positive terminal 20A and the negative terminal 20B). Specifically, the shielding plates 10A and 10B of the present embodiment are connected to the electrode terminals (the positive terminal 20A and the positive terminals 20A and 22B) via the connecting portions 22A and 22B that are bent so as to be bent substantially at right angles from one side surface of the shielding plates 10A and 10B. It is formed integrally with the negative electrode terminal 20B). In other words, in the present embodiment, the wide planes of the shielding plates 10A and 10B and the wide planes of the electrode terminals 20A and 20B are disposed in a substantially perpendicular positional relationship.
Such integral molding of the shielding plate and the electrode terminal can be easily performed without using mechanical joining. Specifically, the positive electrode terminal 20A and the shielding plate 10A can be integrally formed by bending the aluminum plate having the shape shown in FIG. Similarly to the positive electrode side, the negative electrode terminal 20B and the shielding plate 10B can be integrally formed on the negative electrode side by bending a copper plate having a predetermined shape.

上述した電池１００の構成では、電池異常時に、捲回電極体７０の端面７３Ａ、７３Ｂから捲回軸方向外側へ向けて噴出されたガスの一部は遮蔽板１０Ａ，１０Ｂに衝突し、次いで遮蔽板１０Ａ，１０Ｂと捲回電極体７０との隙間１２Ａ、１２Ｂを通って上方に移動しつつ電池容器４０と電極体７０の外周面との間に回り込み、その後、蓋体４４に設けられた安全弁６０を介して電池容器４０の外部へと排出されることとなる。   In the configuration of the battery 100 described above, part of the gas ejected from the end faces 73A and 73B of the wound electrode body 70 toward the outside in the winding axis direction when the battery is abnormal collides with the shielding plates 10A and 10B, and then shields. A safety valve provided on the lid 44 after moving around between the battery container 40 and the outer peripheral surface of the electrode body 70 while moving upward through the gaps 12A, 12B between the plates 10A, 10B and the wound electrode body 70. It is discharged to the outside of the battery container 40 through 60.

このように、捲回電極体７０と電池容器４０との間に遮蔽板１０Ａ，１０Ｂを介在させることにより、噴出したガスが電池容器４０に直接（即ち高温高圧の状態を維持したまま）当たることを回避することができ、電池容器４０の損傷を防止することができる。その結果、高品質で信頼性の高い電池を提供することができる。
また、連結部２２Ａ、２２Ｂを挟んで上記のとおりの位置関係で遮蔽板１０Ａ、１０Ｂと電極端子２０Ａ、２０Ｂとが配置されているため、遮蔽板１０Ａ、１０Ｂに遮られてガスが上部方向に排出される際に電極端子２０Ａ、２０Ｂが障壁とならずにスムーズに上方へのガス移動が実現される。また、当該ガスによる電極端子２０Ａ、２０Ｂの浸食も抑制することができる。 In this way, by interposing the shielding plates 10A and 10B between the wound electrode body 70 and the battery container 40, the ejected gas directly hits the battery container 40 (that is, while maintaining a high temperature and high pressure state). Can be avoided, and damage to the battery container 40 can be prevented. As a result, a high-quality and highly reliable battery can be provided.
Further, since the shielding plates 10A and 10B and the electrode terminals 20A and 20B are arranged in the positional relationship as described above with the coupling portions 22A and 22B interposed therebetween, the gas is blocked by the shielding plates 10A and 10B and the gas is directed upward. When the gas is discharged, the electrode terminals 20A and 20B do not become a barrier, and the upward gas movement is realized smoothly. Moreover, erosion of the electrode terminals 20A and 20B by the gas can also be suppressed.

また、遮蔽板１０Ａ、１０Ｂは、電極端子（正極端子２０Ａおよび負極端子２０Ｂ）と一体に形成されているので、遮蔽板１０Ａ、１０Ｂと捲回電極体７０との位置決めが容易となり、さらには電池異常時にガス噴出し口となる捲回電極体７０の端面（巻き口）７３Ａ、７３Ｂを遮蔽板１０Ａ、１０Ｂで確実に遮蔽することができる。   Further, since the shielding plates 10A and 10B are integrally formed with the electrode terminals (the positive terminal 20A and the negative terminal 20B), the positioning of the shielding plates 10A and 10B and the wound electrode body 70 is facilitated, and further the battery The end surfaces (winding ports) 73A and 73B of the wound electrode body 70 that become gas ejection ports at the time of abnormality can be reliably shielded by the shielding plates 10A and 10B.

さらに、遮蔽板１０Ａ、１０Ｂと捲回電極体７０との間に隙間１２Ａ、１２Ｂを設けることにより、当該隙間１２Ａ、１２Ｂを介して捲回電極体７０内で発生したガスを抜け易くすることができる。これにより、ガス発生に伴う捲回電極体７０の膨張を防止することができる。   Furthermore, by providing the gaps 12A and 12B between the shielding plates 10A and 10B and the wound electrode body 70, it is possible to easily release the gas generated in the wound electrode body 70 through the gaps 12A and 12B. it can. Thereby, the expansion | swelling of the winding electrode body 70 accompanying gas generation can be prevented.

なお、遮蔽板１０Ａ、１０Ｂは、捲回電極体の端面７３Ａ、７３Ｂから噴出したガスを遮蔽し得る形状であればよく、上述した略矩形状に限らず、電池の構成条件（例えば捲回電極体の端面７３Ａ、７３Ｂの形状等）に合わせて適宜好適なものに変更することができる。また、遮蔽板１０Ａ、１０Ｂの材質（本実施形態では正極側がアルミニウム製、負極側が銅製）も、一体成形される電極端子（正極端子２０Ａおよび負極端子２０Ｂ）の材質に応じて適宜変更可能である。   The shielding plates 10A and 10B may have any shape that can shield the gas ejected from the end faces 73A and 73B of the wound electrode body, and are not limited to the above-described substantially rectangular shape, but may include battery configuration conditions (for example, wound electrodes). The shape of the body end faces 73A, 73B, etc.) can be appropriately changed to a suitable one. In addition, the material of the shielding plates 10A and 10B (in this embodiment, the positive electrode side is made of aluminum and the negative electrode side is made of copper) can be appropriately changed according to the material of the integrally formed electrode terminals (the positive electrode terminal 20A and the negative electrode terminal 20B). .

或いは、遮蔽板１０Ａ、１０Ｂを樹脂材料やセラミックで構成してもよい。例えば樹脂製の遮蔽板を用いることにより、金属製の遮蔽板を用いる場合に比べて、低コスト化、軽量化を図ることができ、また、遮蔽板の形状の自由度を高めることが可能となる。なお、樹脂製の遮蔽板を使用する場合には、例えばインサート成形によって遮蔽板１０Ａ、１０Ｂと電極端子（正極端子２０Ａおよび負極端子２０Ｂ）とを一体に形成することができる。耐熱性の高い樹脂材料（例えば、ポリフェニレンサルファイド樹脂（ＰＰＳ））から構成されることが特に好ましい。   Alternatively, the shielding plates 10A and 10B may be made of a resin material or ceramic. For example, by using a resin shielding plate, it is possible to reduce the cost and weight compared to the case of using a metal shielding plate, and to increase the degree of freedom of the shape of the shielding plate. Become. In addition, when using resin-made shielding boards, shielding board 10A, 10B and an electrode terminal (positive electrode terminal 20A and negative electrode terminal 20B) can be integrally formed, for example by insert molding. It is particularly preferable to be made of a resin material having high heat resistance (for example, polyphenylene sulfide resin (PPS)).

また、遮蔽板１０Ａ、１０Ｂと捲回電極体の端面７３Ａ、７３Ｂとの隙間の寸法は、捲回電極体７０内で発生したガスが適当量抜け得る程度であればよく、電池の構成条件（例えば電解液の種類や捲回電極体のサイズ等）に応じて適宜調整することができる。   Further, the dimension of the gap between the shielding plates 10A and 10B and the end faces 73A and 73B of the wound electrode body may be such that an appropriate amount of gas generated in the wound electrode body 70 can escape, and the battery configuration conditions ( For example, it can be suitably adjusted according to the type of the electrolytic solution and the size of the wound electrode body.

なお、本実施形態の遮蔽板１０Ａ、１０Ｂは、電極端子（正極端子２０Ａおよび負極端子２０Ｂ）を介して捲回電極体７０と一体に組み付けられているので、当該遮蔽板１０Ａ、１０Ｂを、捲回電極体７０を電池容器４０に収容する際のガイドとして利用することもできる。即ち、図２及び図３に示すように、両サイドの遮蔽板１０Ａ、１０Ｂを電池容器４０の内壁に沿わせつつ、捲回電極体７０を電池容器４０に挿入することにより、捲回電極体７０の挿入性を良好にすることができる。また、この構成では、挿入時に捲回電極体７０と電池容器４０とが直接干渉（接触）して捲回電極体７０が損傷するリスクを低減することもできる。   In addition, since shielding board 10A, 10B of this embodiment is integrated with the wound electrode body 70 via the electrode terminal (positive electrode terminal 20A and negative electrode terminal 20B), the shielding board 10A, 10B is It can also be used as a guide when the rotating electrode body 70 is accommodated in the battery container 40. That is, as shown in FIGS. 2 and 3, the wound electrode body 70 is inserted into the battery container 40 while the shielding plates 10 </ b> A and 10 </ b> B on both sides are along the inner wall of the battery container 40. The insertion property of 70 can be improved. Also, with this configuration, it is possible to reduce the risk of the wound electrode body 70 being damaged due to direct interference (contact) between the wound electrode body 70 and the battery container 40 during insertion.

続いて、本実施形態の電池１００を構成する各構成材料について言及しながら、電池１００の製造方法について説明する。   Then, the manufacturing method of the battery 100 is demonstrated, mentioning each structural material which comprises the battery 100 of this embodiment.

まず、蓋体４４と電極端子（正極端子２０Ａおよび負極端子２０Ｂ）とを組み付ける。具体的には、電池容器４０の蓋体４４と、正極端子２０Ａおよび負極端子２０Ｂとを用意し、正極端子２０Ａの先端部分を蓋体４４に設けた開口部（図示せず）に貫通させる。同様に、負極端子２０Ｂの先端部分を蓋体４４に設けた開口部（図示せず）に貫通させる。このとき、正極端子２０Ａ及び負極端子２０Ｂと、蓋体４４との間にガスケット（図示せず）を配置することができる。このガスケット（図示せず）によって蓋体４４と正極端子２０Ａおよび負極端子２０Ｂとを絶縁するとともに、電池１００の密閉性を確保することができる。なお、ここで用意される正極端子２０Ａおよび負極端子２０Ｂは、予め曲げ加工によって遮蔽板１０Ａ、１０Ｂが一体に形成されたものである。   First, the lid 44 and the electrode terminals (the positive terminal 20A and the negative terminal 20B) are assembled. Specifically, a lid body 44 of the battery container 40, a positive electrode terminal 20 </ b> A, and a negative electrode terminal 20 </ b> B are prepared, and a tip portion of the positive electrode terminal 20 </ b> A is passed through an opening (not shown) provided in the lid body 44. Similarly, the tip of the negative electrode terminal 20 </ b> B is passed through an opening (not shown) provided in the lid body 44. At this time, a gasket (not shown) can be disposed between the positive electrode terminal 20 </ b> A and the negative electrode terminal 20 </ b> B and the lid body 44. The gasket 44 (not shown) can insulate the lid 44 from the positive electrode terminal 20A and the negative electrode terminal 20B, and ensure the hermeticity of the battery 100. Note that the positive electrode terminal 20A and the negative electrode terminal 20B prepared here are obtained by integrally forming the shielding plates 10A and 10B by bending.

続いて、正極端子２０Ａおよび負極端子２０Ｂを捲回電極体７０に取り付ける。本実施形態に係る捲回電極体７０は、通常のリチウムイオン電池の捲回電極体と同様、シート状正極（以下「正極シート」という。）とシート状負極（以下「負極シート」という。）を計２枚のシート状セパレータ（以下「セパレータシート」という。）と共に積層し、さらに当該正極シートと負極シートとをややずらしつつ捲回し、次いで得られた捲回体を側面方向から押しつぶして拉げさせることによって作製される扁平形状の捲回電極体７０である。   Subsequently, the positive electrode terminal 20 </ b> A and the negative electrode terminal 20 </ b> B are attached to the wound electrode body 70. The wound electrode body 70 according to the present embodiment is a sheet-like positive electrode (hereinafter referred to as “positive electrode sheet”) and a sheet-like negative electrode (hereinafter referred to as “negative electrode sheet”), similarly to the wound electrode body of a normal lithium ion battery. Are laminated together with a total of two sheet-like separators (hereinafter referred to as “separator sheets”), and the positive electrode sheet and the negative electrode sheet are wound with a slight shift, and then the obtained wound body is crushed from the lateral direction. This is a flat wound electrode body 70 produced by bending.

かかる捲回電極体７０の捲回方向に対する横方向において、上記のとおりにややずらしつつ捲回された結果として、正極シートおよび負極シートの端の一部がそれぞれ捲回コア部分（即ち正極シートの正極活物質層形成部分と負極シートの負極活物質層形成部分とセパレータシートとが密に捲回された部分）から外方にはみ出ている。かかる正極側はみ出し部分（即ち捲回電極体７０の端部７２Ａ）および負極側はみ出し部分７２Ｂ（即ち捲回電極体７０の端部７２Ｂ）に正極端子２０Ａおよび負極端子２０Ｂを付設することができる。   As a result of the winding electrode body 70 being wound with a slight shift as described above in the lateral direction with respect to the winding direction, a part of the ends of the positive electrode sheet and the negative electrode sheet are respectively wound core portions (that is, the positive electrode sheet). The positive electrode active material layer forming part, the negative electrode active material layer forming part of the negative electrode sheet, and the separator sheet are closely wound around). The positive electrode terminal 20A and the negative electrode terminal 20B can be attached to the positive electrode side protruding portion (that is, the end portion 72A of the wound electrode body 70) and the negative electrode side protruding portion 72B (that is, the end portion 72B of the wound electrode body 70).

本実施形態では、正極端子２０Ａと正極側はみ出し部分との接合は超音波溶接により行われ、負極端子２０Ｂと負極側はみ出し部分との接合はスポット溶接により行われている。なお、各電極端子と各電極はみ出し部分とは電気的に接続されていればよく、本実施形態のように両者を直接接続してもよいし、他の導電部材を介して接続してもよい。このようにして、蓋体４４と電極端子（正極端子２０Ａおよび負極端子２０Ｂ）と捲回電極体７０とを一体に組み付けることができる（図２の上図および図３の上図）。   In the present embodiment, the joining of the positive electrode terminal 20A and the protruding portion on the positive electrode side is performed by ultrasonic welding, and the bonding between the negative electrode terminal 20B and the protruding portion on the negative electrode side is performed by spot welding. In addition, each electrode terminal and each electrode protrusion part should just be electrically connected, both may be directly connected like this embodiment, and may be connected via another electrically-conductive member. . In this way, the lid body 44, the electrode terminals (the positive terminal 20A and the negative terminal 20B), and the wound electrode body 70 can be assembled together (upper view in FIG. 2 and upper view in FIG. 3).

なお、捲回電極体７０を構成する材料および部材自体は、従来のリチウムイオン電池の電極体と同様でよく、特に制限はない。例えば、正極シートは長尺状の正極集電体の上にリチウムイオン電池用正極活物質層が付与されて形成され得る。正極集電体にはアルミニウム箔（本実施形態）その他の正極に適する金属箔が好適に使用される。正極活物質は従来からリチウムイオン電池に用いられる物質の一種または二種以上を特に限定することなく使用することができる。好適例として、ＬｉＭｎ２Ｏ４、ＬｉＣｏＯ２、ＬｉＮｉＯ２等が挙げられる。例えば、長さ２〜４ｍ（例えば２．７ｍ）、幅８〜１２ｃｍ（例えば１０ｃｍ）、厚さ５〜２０μｍ（例えば１５μｍ）程度のアルミニウム箔を集電体として使用し、その表面の所定領域に常法によってニッケル酸リチウムを主体とするリチウムイオン電池用正極活物質層（例えばニッケル酸リチウム８８質量％、アセチレンブラック１０質量％、ポリテトラフルオロエチレン１質量％、カルボキシメチルセルロース１質量％）を形成することによって好適な正極シートが得られる。 In addition, the material and member itself which comprise the winding electrode body 70 may be the same as that of the electrode body of the conventional lithium ion battery, and there is no restriction | limiting in particular. For example, the positive electrode sheet can be formed by applying a positive electrode active material layer for a lithium ion battery on a long positive electrode current collector. For the positive electrode current collector, an aluminum foil (this embodiment) or other metal foil suitable for the positive electrode is preferably used. As the positive electrode active material, one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation. Preferable examples include LiMn 2 O 4 , LiCoO 2 , LiNiO 2 and the like. For example, an aluminum foil having a length of 2 to 4 m (for example, 2.7 m), a width of 8 to 12 cm (for example, 10 cm), and a thickness of about 5 to 20 μm (for example, 15 μm) is used as a current collector. A positive electrode active material layer for lithium ion batteries mainly composed of lithium nickelate is formed by a conventional method (for example, lithium nickelate 88% by mass, acetylene black 10% by mass, polytetrafluoroethylene 1% by mass, carboxymethylcellulose 1% by mass). Thus, a suitable positive electrode sheet can be obtained.

一方、負極シートは長尺状の負極集電体の上にリチウムイオン電池用負極活物質層が付与されて形成され得る。負極集電体には銅箔（本実施形態）その他の負極に適する金属箔が好適に使用される。負極活物質は従来からリチウムイオン電池に用いられる物質の一種または二種以上を特に限定することなく使用することができる。好適例として、グラファイトカーボン、アモルファスカーボン等の炭素系材料、リチウム含有遷移金属酸化物や遷移金属窒化物等が挙げられる。例えば、長さ２〜４ｍ（例えば２．９ｍ）、幅８〜１２ｃｍ（例えば１０ｃｍ）、厚さ５〜２０μｍ（例えば１０μｍ）程度の銅箔を使用し、その表面の所定領域に常法によって黒鉛を主体とするリチウムイオン電池用負極活物質層（例えば黒鉛９８質量％、スチレンブタジエンラバー１質量％、カルボキシメチルセルロース１質量％）を形成することによって好適な負極シートが得られる。   On the other hand, the negative electrode sheet can be formed by applying a negative electrode active material layer for a lithium ion battery on a long negative electrode current collector. For the negative electrode current collector, a copper foil (this embodiment) or other metal foil suitable for the negative electrode is preferably used. As the negative electrode active material, one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation. Preferable examples include carbon-based materials such as graphite carbon and amorphous carbon, lithium-containing transition metal oxides and transition metal nitrides. For example, a copper foil having a length of 2 to 4 m (for example, 2.9 m), a width of 8 to 12 cm (for example, 10 cm), and a thickness of about 5 to 20 μm (for example, 10 μm) is used. A suitable negative electrode sheet is obtained by forming a negative electrode active material layer for lithium ion batteries (for example, 98% by mass of graphite, 1% by mass of styrene butadiene rubber, 1% by mass of carboxymethyl cellulose).

また、正負極シート間に使用される好適なセパレータシートとしては多孔質ポリオレフィン系樹脂で構成されたものが挙げられる。例えば、長さ２〜４ｍ（例えば３．１ｍ）、幅８〜１２ｃｍ（例えば１１ｃｍ）、厚さ５〜３０μｍ（例えば２５μｍ）程度の合成樹脂製（例えばポリエチレン等のポリオレフィン製）多孔質セパレータシートが好適に使用し得る。なお、電解質として固体電解質若しくはゲル状電解質を使用する場合には、セパレータが不要な場合（即ちこの場合には電解質自体がセパレータとして機能し得る。）があり得る。   Moreover, what was comprised with porous polyolefin resin as a suitable separator sheet used between positive and negative electrode sheets is mentioned. For example, a porous separator sheet made of synthetic resin (for example, made of polyolefin such as polyethylene) having a length of 2 to 4 m (for example, 3.1 m), a width of 8 to 12 cm (for example, 11 cm), and a thickness of about 5 to 30 μm (for example, 25 μm). It can be preferably used. When a solid electrolyte or a gel electrolyte is used as the electrolyte, there may be a case where a separator is unnecessary (that is, in this case, the electrolyte itself can function as a separator).

続いて、電極端子（正極端子２０Ａおよび負極端子２０Ｂ）および蓋体４４と一体に組み付けられた捲回電極体７０を電池容器４０に収容する。このとき、電極端子（正極端子２０Ａおよび負極端子２０Ｂ）を介して捲回電極体７０と一体に組み付けられた遮蔽板１０Ａ、１０Ｂを、電極体挿入用のガイドとして利用することができ、捲回電極体７０の挿入性を良好にすることができる（図２および図３参照）。   Subsequently, the wound electrode body 70 assembled integrally with the electrode terminals (the positive electrode terminal 20 </ b> A and the negative electrode terminal 20 </ b> B) and the lid body 44 is accommodated in the battery container 40. At this time, the shielding plates 10A and 10B assembled integrally with the wound electrode body 70 via the electrode terminals (the positive terminal 20A and the negative terminal 20B) can be used as a guide for inserting the electrode body. The insertability of the electrode body 70 can be improved (see FIGS. 2 and 3).

その後、電池容器４０の上端開口部４２を蓋体４４で塞ぎ、電池容器４０に蓋体４４を載置した状態で蓋体４４の全周を溶接して封止する。   Thereafter, the upper end opening 42 of the battery container 40 is closed with the lid body 44, and the entire circumference of the lid body 44 is welded and sealed in a state where the lid body 44 is placed on the battery container 40.

続けて、容器４０の蓋体４４に形成された注液口（図示せず）から電解液を注入する。本実施形態では、非水溶媒に電解質を溶解した非水電解液を注入している。この電解液を構成する非水溶媒としては、エチレンカーボネート、プロピレンカーボネート、ジメチルカーボネート（ＤＭＣ）、ジエチルカーボネート、エチルメチルカーボネート（ＥＭＣ）、１，２−ジメトキシエタン、１，２−ジエトキシエタン、テトラヒドロフラン、１，３−ジオキソラン等からなる群から選択された一種または二種以上を用いることができる。本実施形態に係る密閉型電池では、ジエチルカーボネートとエチレンカーボネートとの混合溶媒（例えば質量比１：１）を用いている。   Subsequently, an electrolytic solution is injected from a liquid injection port (not shown) formed in the lid 44 of the container 40. In this embodiment, a nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent is injected. Examples of the non-aqueous solvent constituting the electrolyte include ethylene carbonate, propylene carbonate, dimethyl carbonate (DMC), diethyl carbonate, ethyl methyl carbonate (EMC), 1,2-dimethoxyethane, 1,2-diethoxyethane, and tetrahydrofuran. One, two or more selected from the group consisting of 1,3-dioxolane and the like can be used. In the sealed battery according to the present embodiment, a mixed solvent of diethyl carbonate and ethylene carbonate (for example, a mass ratio of 1: 1) is used.

また、この電解液を構成する電解質（支持塩）としては、フッ素を構成元素とする各種リチウム塩から選択される一種または二種以上を用いることができる。例えば、ＬｉＰＦ６，ＬｉＢＦ４，ＬｉＡＳＦ６，ＬｉＣＦ３ＳＯ３，ＬｉＣ４Ｆ９ＳＯ３，ＬｉＮ（ＣＦ３ＳＯ２）２，ＬｉＣ（ＣＦ３ＳＯ２）３等からなる群から選択される一種または二種以上を用いることができる。本実施形態に係る密閉型電池では、電解質としてヘキサフルオロリン酸リチウム（ＬｉＰＦ６）を用いている。その濃度は約１ｍｏｌ／リットルである。 Moreover, as the electrolyte (supporting salt) constituting this electrolytic solution, one or two or more selected from various lithium salts containing fluorine as a constituent element can be used. For example, one type selected from the group consisting of LiPF 6 , LiBF 4 , LiASF 6 , LiCF 3 SO 3 , LiC 4 F 9 SO 3 , LiN (CF 3 SO 2 ) 2 , LiC (CF 3 SO 2 ) 3, or the like Two or more types can be used. In the sealed battery according to the present embodiment, lithium hexafluorophosphate (LiPF 6 ) is used as the electrolyte. Its concentration is about 1 mol / liter.

注液口から上記電解液を注入した後、注液口に封止栓（図示せず）を挿入して封止することによって本実施形態の電池１００は構築される。   The battery 100 of this embodiment is constructed by injecting the electrolytic solution from the injection port and then inserting a sealing plug (not shown) into the injection port and sealing.

次に、図５を参照しながら、本発明の別の一実施形態を説明する。この第２の実施形態では、遮蔽板が蓋体と一体的に形成されている点において上述の電池１００とは異なる。従って、電池１００と同一の構成部材には同一の符号を付し、その重複した説明を省略する。   Next, another embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the battery 100 described above in that the shielding plate is formed integrally with the lid. Therefore, the same components as those of the battery 100 are denoted by the same reference numerals, and redundant description thereof is omitted.

この実施形態の遮蔽板１１Ａ、１１Ｂは、蓋体４５と一体に形成されている。図示した例では、遮蔽板１１Ａ、１１Ｂは、蓋体４５の端部から捲回電極体７０の捲回軸方向端面７３Ａ、７３Ｂに沿って図面下方向に真っ直ぐ延びており、それぞれ捲回電極体の端面７３Ａ、７３Ｂを覆うように形成されている。このように蓋体４５と一体成形された遮蔽板１１Ａ、１１Ｂであっても、電池異常時に発生したガスの遮蔽壁として機能し得、上述した電池１００と同様の作用効果を得ることができる。なお、遮蔽板１１Ａ、１１Ｂを蓋体４５と一体に形成した場合には、当該遮蔽板１１Ａ、１１Ｂの材質は、蓋体４５の材質に応じて適宜変更可能である。捲回電極体７０は、当該捲回電極体７０と電極端子２１Ａ、２１Ｂと蓋体４５とを一体に組み付けた後、電池容器に収容されるので、蓋体４５と一体となった遮蔽板１１Ａ、１１Ｂを、捲回電極体７０を挿入する際のガイドとして利用することも可能である。   The shielding plates 11 </ b> A and 11 </ b> B of this embodiment are formed integrally with the lid body 45. In the illustrated example, the shielding plates 11A and 11B extend straight downward from the end of the lid body 45 along the winding axis direction end faces 73A and 73B of the wound electrode body 70, respectively. Are formed so as to cover the end faces 73A and 73B. Thus, even the shielding plates 11A and 11B integrally formed with the lid 45 can function as a shielding wall for the gas generated when the battery is abnormal, and the same effects as the battery 100 described above can be obtained. When the shielding plates 11A and 11B are formed integrally with the lid 45, the material of the shielding plates 11A and 11B can be changed as appropriate according to the material of the lid 45. Since the wound electrode body 70 is assembled into the battery container after the wound electrode body 70, the electrode terminals 21A and 21B, and the lid body 45 are assembled together, the shielding plate 11A integrated with the lid body 45 is used. 11B can be used as a guide when inserting the wound electrode body 70.

なお、上記のようにして製造した電池１００を所定の方向に複数配列し、当該複数の電池１００をその配列方向に拘束することによって組電池９０を構築することができる。
このようにして構築した組電池９０は、特に自動車等の車両に搭載されるモーター（電動機）用電源として好適に使用し得る。
従って、本発明では、図６に模式的に示すように、本発明の電池（特にはリチウムイオン電池）を単電池として構成された組電池９０を電源として備える車両１（典型的には自動車、特にハイブリッド自動車、電気自動車、燃料電池自動車のような電動機を備える自動車）を提供することができる。 The assembled battery 90 can be constructed by arranging a plurality of the batteries 100 manufactured as described above in a predetermined direction and constraining the plurality of batteries 100 in the arrangement direction.
The assembled battery 90 thus constructed can be suitably used as a power source for a motor (electric motor) mounted on a vehicle such as an automobile.
Therefore, in the present invention, as schematically shown in FIG. 6, a vehicle 1 (typically, an automobile) including a battery pack 90 in which the battery of the present invention (particularly, a lithium ion battery) is configured as a single battery as a power source. In particular, a vehicle including an electric motor such as a hybrid vehicle, an electric vehicle, and a fuel cell vehicle can be provided.

以上、本発明を好適な実施形態により説明してきたが、こうした記述は限定事項ではなく、勿論、種々の改変が可能である。例えば上述した実施形態では、遮蔽板１０Ａ、１０Ｂは、捲回電極体７０の端面７３Ａ、７３Ｂの全体を覆うように形成されている（例えば図２、図３）が、本発明の効果を奏する限りにおいて、捲回電極体７０の端面７３Ａ、７３Ｂが部分的に（一部でもよい）覆われるような形状の遮蔽板、例えばガス噴出が想定されない部分は覆われないような形状の遮蔽板であってもよい。
また、密閉型電池の種類は上述したリチウムイオン電池に限られず、電極体構成材料や電解質が異なる種々の内容の電池、例えばリチウム金属やリチウム合金を負極とするリチウム二次電池、ニッケル水素電池、ニッケルカドミウム電池、或いは電気二重層キャパシタであってもよい。 As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible. For example, in the above-described embodiment, the shielding plates 10A and 10B are formed so as to cover the entire end surfaces 73A and 73B of the wound electrode body 70 (for example, FIG. 2 and FIG. 3). As long as the end faces 73A and 73B of the wound electrode body 70 are partially (or may be partially) covered with a shielding plate, for example, a shielding plate that is not covered with a portion where no gas ejection is assumed. There may be.
Further, the type of sealed battery is not limited to the above-described lithium ion battery, but batteries having various contents with different electrode body constituent materials and electrolytes, for example, lithium secondary batteries having nickel metal or lithium alloy as a negative electrode, nickel metal hydride batteries, It may be a nickel cadmium battery or an electric double layer capacitor.

第１の実施形態に係る電池の外観を模式的に示す斜視図である。It is a perspective view which shows typically the external appearance of the battery which concerns on 1st Embodiment. 第１の実施形態に係る電池の構成を模式的に示す分解斜視図である。It is a disassembled perspective view which shows typically the structure of the battery which concerns on 1st Embodiment. 第１の実施形態に係る電池の構成を模式的に示す分解正面図である。It is an exploded front view showing typically the composition of the battery concerning a 1st embodiment. 遮蔽板および正極端子の構成を説明するための図である。It is a figure for demonstrating the structure of a shielding board and a positive electrode terminal. 第２の実施形態に係る電池の構成を模式的に示す分解正面図である。It is a disassembled front view which shows typically the structure of the battery which concerns on 2nd Embodiment. 本発明の組電池を備えた車両（自動車）を模式的に示す側面図である。It is a side view which shows typically the vehicle (automobile) provided with the assembled battery of this invention.

符号の説明Explanation of symbols

１ 車両
１０Ａ、１０Ｂ、１１Ａ、１１Ｂ 遮蔽板
１２Ａ、１２Ｂ 隙間
２０Ａ 正極端子
２０Ｂ 負極端子
２２Ａ、２２Ｂ 連結部
４０ 電池容器
４２ 開口部
４４、４５ 蓋体
６０ 安全弁
７０ 捲回電極体
７２Ａ、７２Ｂ 端部
７３Ａ，７３Ｂ 端面
９０ 組電池
１００ 電池 DESCRIPTION OF SYMBOLS 1 Vehicle 10A, 10B, 11A, 11B Shielding board 12A, 12B Clearance 20A Positive electrode terminal 20B Negative electrode terminal 22A, 22B Connection part 40 Battery container 42 Opening part 44, 45 Cover body 60 Safety valve 70 Winding electrode body 72A, 72B End part 73A 73B End face 90 Battery pack 100 Battery

Claims (5)

電池容器と、
前記電池容器の開口部を介して前記電池容器に収容される捲回電極体と、
前記捲回電極体の捲回軸方向における端部に接合される電極端子と、
前記電池容器の開口部を塞ぐ蓋体と
を備え、
前記捲回電極体の捲回軸方向における端面と当該端面に対向する前記電池容器の内壁との間には、当該捲回電極体端面と電池容器内壁とを隔てる遮蔽板が配置されており、
前記遮蔽板は、前記電極端子または前記蓋体と一体に形成されていることを特徴とする、電池。 A battery container;
A wound electrode body housed in the battery container via the opening of the battery container;
An electrode terminal joined to an end in the winding axis direction of the wound electrode body;
A lid for closing the opening of the battery container;
Between the end face in the winding axis direction of the wound electrode body and the inner wall of the battery container facing the end face, a shielding plate is disposed to separate the wound electrode body end face and the battery container inner wall,
The battery, wherein the shielding plate is formed integrally with the electrode terminal or the lid. 前記遮蔽板と前記捲回電極体との間には、隙間が設けられていることを特徴とする、請求項１に記載の電池。   The battery according to claim 1, wherein a gap is provided between the shielding plate and the wound electrode body. 前記捲回電極体は、前記開口部を介して捲回軸方向と直交する方向に前記電池容器に収容されていることを特徴とする、請求項１または２に記載の電池。   3. The battery according to claim 1, wherein the wound electrode body is accommodated in the battery container in a direction orthogonal to a winding axis direction through the opening. 前記遮蔽板は、樹脂製であることを特徴とする、請求項１から３の何れか一つに記載の電池。   The battery according to any one of claims 1 to 3, wherein the shielding plate is made of resin. 請求項１から４の何れか一つに記載の電池を備える車両。   A vehicle comprising the battery according to any one of claims 1 to 4.
JP2007200254A 2007-08-01 2007-08-01 Battery Withdrawn JP2009037818A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010282846A (en) * 2009-06-04 2010-12-16 Toyota Motor Corp Secondary battery and method of manufacturing the same
WO2012133775A1 (en) * 2011-03-30 2012-10-04 株式会社Ｇｓユアサ Power storage element
US20130052500A1 (en) * 2011-08-31 2013-02-28 Sanyo Electric Co., Ltd. Prismatic secondary battery
JP2013157085A (en) * 2012-01-26 2013-08-15 Hitachi Vehicle Energy Ltd Secondary battery
US9514895B2 (en) 2010-12-20 2016-12-06 Gs Yuasa International Ltd. Electric storage device having current collector and vehicle having the electric storage device
US10971713B2 (en) 2011-07-01 2021-04-06 Gs Yuasa International Ltd. Electric storage device and spacer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010282846A (en) * 2009-06-04 2010-12-16 Toyota Motor Corp Secondary battery and method of manufacturing the same
US9514895B2 (en) 2010-12-20 2016-12-06 Gs Yuasa International Ltd. Electric storage device having current collector and vehicle having the electric storage device
WO2012133775A1 (en) * 2011-03-30 2012-10-04 株式会社Ｇｓユアサ Power storage element
JP5904203B2 (en) * 2011-03-30 2016-04-13 株式会社Ｇｓユアサ Electricity storage element
US10971713B2 (en) 2011-07-01 2021-04-06 Gs Yuasa International Ltd. Electric storage device and spacer
US20130052500A1 (en) * 2011-08-31 2013-02-28 Sanyo Electric Co., Ltd. Prismatic secondary battery
JP2013157085A (en) * 2012-01-26 2013-08-15 Hitachi Vehicle Energy Ltd Secondary battery

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