JP4617679B2 - Laminated battery - Google Patents

Laminated battery Download PDF

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JP4617679B2
JP4617679B2 JP2004031498A JP2004031498A JP4617679B2 JP 4617679 B2 JP4617679 B2 JP 4617679B2 JP 2004031498 A JP2004031498 A JP 2004031498A JP 2004031498 A JP2004031498 A JP 2004031498A JP 4617679 B2 JP4617679 B2 JP 4617679B2
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guide
gas
battery
laminate
welded
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JP2005222872A (en
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俊一 増田
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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

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Description

本発明は，ラミネート外装体に挿入されたラミネート電池に関する。さらに詳細には，リチウム電池等の二次電池の電極体をラミネート外装体に挿入して，その外周が溶着されたラミネート電池に関するものである。   The present invention relates to a laminate battery inserted into a laminate outer package. More specifically, the present invention relates to a laminate battery in which an electrode body of a secondary battery such as a lithium battery is inserted into a laminate outer package and its outer periphery is welded.

従来より，ラミネートフィルムを外装体として溶着密閉された薄型軽量の二次電池が使用されている。この二次電池では，過充電・短絡等の異常時には，内部に多量のガスが発生して内圧が上昇する場合がある。また，使用環境温度の大きな変化によっても内圧が上昇する場合がある。ラミネートフィルム自体は強度の大きいものでないため，安全性を考慮した考案がなされている（例えば，特許文献１，特許文献２参照。）。特許文献１に記載の電池では，側壁の一方に貫通孔と弁板とで構成される安全弁機構が設けられている。また，特許文献２に記載の電池では，ラミネート外装体と電極体との間に補強部材が設けられている。   Conventionally, a thin and lightweight secondary battery welded and sealed using a laminate film as an exterior body has been used. In this secondary battery, when an abnormality such as overcharge or short circuit occurs, a large amount of gas is generated inside and the internal pressure may increase. Also, the internal pressure may increase due to a large change in the operating environment temperature. Since the laminate film itself is not high in strength, it has been devised in consideration of safety (for example, see Patent Document 1 and Patent Document 2). In the battery described in Patent Document 1, a safety valve mechanism including a through hole and a valve plate is provided on one side wall. In the battery described in Patent Document 2, a reinforcing member is provided between the laminate outer package and the electrode assembly.

このような安全機構にもかかわらず内圧が上昇しすぎた場合のために，一般に，ラミネート電池では，異常時に発生ガスを排出するためのガス排出部が設けられている。これは，例えば周囲の溶着をわざと弱くした部分であり，内圧が上昇しすぎた場合にはこの部分の溶着がはがれてガスを外部に逃がすためのものである。この発生ガスは，人体や他の装置にとって有害である場合があるため，ガス排出部に対応させて排気ダクト等を設け，安全な位置へとガスを導くのである。これによって，それ以外の部分に排出ガスが流れ込むことを防止している。
特開平６−２２３７９６号公報（第４−５頁） 特開２００１−２８３７９８号公報（第３頁） In general, the laminate battery is provided with a gas discharge portion for discharging generated gas when an abnormality occurs in order to prevent the internal pressure from increasing excessively despite such a safety mechanism. This is, for example, a part where the surrounding welding is intentionally weakened, and when the internal pressure rises too much, this part is peeled off to release the gas to the outside. Since this generated gas may be harmful to the human body or other devices, an exhaust duct or the like is provided in correspondence with the gas discharge part to guide the gas to a safe position. This prevents the exhaust gas from flowing into other parts.
JP-A-6-223796 (page 4-5) JP 2001-283798 A (page 3)

しかしながら，前記のラミネート電池においては，あらかじめ設定されたガス排出部以外の場所からガスが排出されるおそれがあるという問題点があった。このような電池に用いられるラミネートフィルムは，厚さ１００μｍ程度で，そのうち金属箔部分が５０μｍ程度のものが多い。このようなフィルムでは，形状の自由度が大きく軽量であるという利点があるが，その一方で変形しやすいという問題点もある。特に，電池製作時，電池組付け時や使用時等に力が加わることによって変形しやすい。そのように変形した履歴を持つ部分では，疲労や応力腐食によって強度が低下する場合があり，そのため，予定したガス排出部以外に，より強度の低い部分ができてしまうことがあった。また，一般に溶着強度はバラツキが大きく，ガス排出部として設定されている部分以外にも溶着が弱い部分ができてしまうことがある。これらの理由からガス排出部以外の部分が最も弱くなると，異常時等に内圧が上昇した場合にその部分が破損するおそれがあった。さらには，そこから意図しない方へガスが流れ出すおそれがあるという問題点があった。   However, the laminate battery has a problem in that gas may be discharged from a place other than a preset gas discharge portion. A laminate film used for such a battery has a thickness of about 100 μm, and a metal foil portion of which is often about 50 μm. Such a film has the advantage that the degree of freedom in shape is large and lightweight, but there is also a problem that it is easily deformed. In particular, it easily deforms when a force is applied during battery production, battery assembly, or use. In such a deformed portion, the strength may be reduced due to fatigue or stress corrosion, and therefore, a lower strength portion may be formed in addition to the planned gas discharge portion. In general, the welding strength varies widely, and there may be a portion where welding is weak in addition to the portion set as the gas discharge portion. For these reasons, when the part other than the gas discharge part becomes weakest, the part may be damaged when the internal pressure rises during an abnormality. Furthermore, there is a problem that gas may flow out to an unintended direction.

本発明は，前記した従来のラミネート電池が有する問題点を解決するためになされたものである。すなわちその課題とするところは，電池内部で発生したガスをあらかじめ設定されたガス排出部から確実に排出するようにしたラミネート電池を提供することにある。   The present invention has been made to solve the problems of the conventional laminate battery described above. That is, an object of the present invention is to provide a laminated battery in which gas generated inside the battery is surely discharged from a preset gas discharge portion.

この課題の解決を目的としてなされた本発明のラミネート電池は，発電要素と，発電要素に接続された両極端子と，発電要素を包むラミネートフィルムとを有し，ラミネートフィルムの縁辺部が溶着されて溶着部をなし，溶着部の一部にガス排出部が設けられるとともに両極端子が溶着部から突出しているラミネート電池であって，発電要素の周囲に配置されるとともに，発電要素の縁辺との間に，ガス排出部につながるガス流路を形成するガイド部材を有し，ガイド部材は，発電要素とともにラミネートフィルムに包まれているものである。 Laminate battery solutions present invention made for the purpose of this problem has a power generating element, a double-pole terminal connected to the power generating element and a laminate film wrapping the power generating element, edge portions of the laminate film is welded No welding portion Te, a laminate battery in which both poles terminals protrudes from the welded portion with the gas discharging portion is provided in a part of the welded portion, while being disposed around the power generating element, and edges of the power generating element A guide member for forming a gas flow path connected to the gas discharge portion is provided between the two, and the guide member is wrapped in a laminate film together with the power generation element.

本発明のラミネート電池は，ラミネートフィルムが発電要素を包んでその縁辺部が溶着されたものであり，その溶着部の一部にガス排出部が設けられる。さらに，本発明では，発電要素の周囲に配置され，ラミネートフィルムに包まれたガイド部材を有しているので，発電要素から排出されたガスの圧力は，ガイド部材によって受けられる。さらに，ガイド部材と発電要素の縁辺との間に，ガス排出部につながるガス流路が形成されているので，排出ガスはそのガス流路を通ってガス排出部へと導かれる。従って，電池内部で発生したガスをあらかじめ設定されたガス排出部から確実に排出するようにしたラミネート電池となっている。   In the laminated battery of the present invention, the laminated film encloses the power generation element and the edge thereof is welded, and a gas discharge part is provided in a part of the welded part. Furthermore, in this invention, since it has the guide member arrange | positioned around the power generation element and wrapped in the laminate film, the pressure of the gas discharged | emitted from the power generation element is received by the guide member. Furthermore, since the gas flow path connected to the gas discharge section is formed between the guide member and the edge of the power generation element, the exhaust gas is guided to the gas discharge section through the gas flow path. Therefore, the laminated battery is configured such that the gas generated inside the battery is reliably discharged from a preset gas discharge portion.

さらに本発明では，ガイド部材は，ガス排出部の箇所を除いて発電要素の周囲の全周にわたって設けられている。
このため，ガイド部材はガス排出部以外の全周において圧力を受けることができる。その一方で，ガイド部材はガス排出部には設けられないので，ガス排出部に導かれたガスの圧力はガイドによって受けられることはない。従って，ガス排出部では溶着部によって圧力が受けられ，この部分が真っ先に破壊されるので，ガスの排出路となる。 Further, in the present invention, the guide member, that provided over the entire circumference of the periphery of the power generating element except where the gas outlet portion.
For this reason , a guide member can receive a pressure in the perimeter other than a gas discharge part. On the other hand, since the guide member is not provided in the gas discharge portion, the pressure of the gas guided to the gas discharge portion is not received by the guide. Therefore, in the gas discharge part, pressure is received by the welding part, and this part is destroyed first, so that it becomes a gas discharge path.

さらに本発明では，ガイド部材は，発電要素に向かって開いたガス流路部と，その外側の背部とを有し，溶着部では，ラミネートフィルムがガイド部材の背部にも溶着されていることが望ましい。
このようにすれば，背部によってガイド部材はラミネートフィルムに溶着されて固定される。従って，ラミネートフィルム内部で移動したり発電要素に傷を付けたりするおそれはない。さらに，ガイド部材の背部とラミネートフィルムとの間には空間がほとんどできないので，ガイド部材の背部にガスが回り込むことはほとんどなく，ガイド部材の外側がガス流路となることはない。 Furthermore, in the present invention, the guide member has a gas flow path portion that opens toward the power generation element and a back portion outside the gas flow passage portion, and in the weld portion, the laminate film is also welded to the back portion of the guide member. desirable.
In this way, the guide member is welded and fixed to the laminate film by the back portion. Therefore, there is no risk of moving inside the laminate film or scratching the power generating element. Furthermore, since there is almost no space between the back portion of the guide member and the laminate film, gas hardly wraps around the back portion of the guide member, and the outside of the guide member does not become a gas flow path.

さらに本発明では，ガイド部材は，ラミネートフィルムより剛性の高い部材であることが望ましい。
このようにすれば，ラミネートフィルムより先にガイド部材が破壊されることはないので，圧力を受けることができる。 Furthermore, in the present invention, the guide member is preferably a member having higher rigidity than the laminate film.
By doing so, the guide member is not broken prior to the laminate film, so that pressure can be applied.

本発明のラミネート電池によれば，電池内部で発生したガスをあらかじめ設定されたガス排出部から確実に排出するようにできる。   According to the laminate battery of the present invention, the gas generated inside the battery can be reliably discharged from a preset gas discharge portion.

以下，本発明を具体化した最良の形態について，添付図面を参照しつつ詳細に説明する。本形態は，リチウム電池等の二次電池をラミネートフィルムに封入したラミネート電池である。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode for embodying the present invention will be described in detail with reference to the accompanying drawings. This embodiment is a laminate battery in which a secondary battery such as a lithium battery is enclosed in a laminate film.

本形態のラミネート電池１は，図１に示すように，電極体１１と，その電極体１１から突出した両極端子１２，１３とを有し，これらがラミネートフィルム１４に包まれている。電極体１１は，両極シートにセパレータを挟んで捲回され，扁平状に形成されたものであり，発電要素に相当する。電極体１１の両極シートには，両極端子１２，１３がそれぞれ接続されている。また，両極端子１２，１３はラミネートフィルム１４からも突出している。ラミネートフィルム１４は，金属箔の両面に樹脂がコーティングされたものであり，熱溶着によって周囲が密封されている。これらの構成はラミネート電池としては一般的なものである。   As shown in FIG. 1, the laminate battery 1 of this embodiment includes an electrode body 11 and bipolar terminals 12 and 13 protruding from the electrode body 11, and these are wrapped in a laminate film 14. The electrode body 11 is wound in a flat shape by sandwiching a separator between bipolar sheets, and corresponds to a power generation element. Bipolar terminals 12 and 13 are connected to the bipolar sheets of the electrode body 11, respectively. Further, the bipolar terminals 12 and 13 also protrude from the laminate film 14. The laminate film 14 has a metal foil coated with resin on both sides, and the periphery is sealed by heat welding. These configurations are common for laminated batteries.

本形態のラミネート電池１では，さらに，電極体１１を取り巻くガイド１５を備え，電極体１１とともにラミネートフィルム１４によって密封されている。このガイド１５は略長方形の枠形状であり，図２に示すように，内周方向に向かって開いた断面Ｙ字型に形成されている。図２は，図１のＡ−Ａ断面図である。これらの図に示すように，ガイド１５は，電極体１１に向かって開いたガス流路部１５ａとその外側の背部１５ｂとを有している。また，ガイド１５は，ポリプロピレン（ＰＰ）等の強度の高い樹脂製であり，ラミネートフィルム１４に比較して非常に厚い材質で形成されている。従って，ガイド１５はラミネートフィルム１４に比較して剛性の高い部材である。   The laminate battery 1 of the present embodiment further includes a guide 15 surrounding the electrode body 11 and is sealed with a laminate film 14 together with the electrode body 11. The guide 15 has a substantially rectangular frame shape, and is formed in a Y-shaped cross section that opens toward the inner circumferential direction as shown in FIG. 2 is a cross-sectional view taken along the line AA in FIG. As shown in these drawings, the guide 15 has a gas flow path portion 15 a that opens toward the electrode body 11 and a back portion 15 b outside thereof. The guide 15 is made of a resin having high strength such as polypropylene (PP), and is formed of a material that is very thick compared to the laminate film 14. Therefore, the guide 15 is a member having higher rigidity than the laminate film 14.

ガイド１５のガス流路部１５ａの内周は電極体１１の外周よりやや大きく，密封された状態でガイド１５と電極体１１とが密接しない程度にされている。そのため，電極体１１からガスが発生した場合に，この隙間がガス流路となる。また，ガイド１５の背部１５ｂは，ラミネートフィルム１４に挟まれて，ともに溶着されている。これによって，ガイド１５は固定され，ラミネートフィルム１４の内部で移動することはない。さらに，この溶着によってガイド１５の外周側には隙間がほとんどなくなる。従って，ガス流路となるのはガイド１５の内周側のみであり，外周側はガス流路とならない。   The inner circumference of the gas flow path portion 15a of the guide 15 is slightly larger than the outer circumference of the electrode body 11 so that the guide 15 and the electrode body 11 are not in close contact with each other in a sealed state. Therefore, when gas is generated from the electrode body 11, this gap becomes a gas flow path. Further, the back portion 15b of the guide 15 is sandwiched between the laminate films 14 and welded together. As a result, the guide 15 is fixed and does not move inside the laminate film 14. Furthermore, this welding almost eliminates the gap on the outer peripheral side of the guide 15. Therefore, the gas flow path is only on the inner peripheral side of the guide 15, and the outer peripheral side is not a gas flow path.

さらに，ガイド１５には，図１に示すように，図中上辺の一部に外周へ向かって狭くなる台形状に切り取られた排出用開口部２１が設けられている。また，ガイド１５のうち両極端子１２，１３の位置に相当する部分には，図３と図４に示すように，Ｙ字の１片が欠けた切り欠き部２２，２２が形成されている。図４は，図３のＢ−Ｂ断面図である。このラミネート電池１を製造する際には，ガイド１５の図３中手前側に両極端子１２，１３を有する電極体１１を重ねる。これにより，両極端子１２，１３は，切り欠き部２２の背部１５ｂに重なって外側へ出される。すなわち，ガイド１５は排出用開口部２１を除いて，電極体１１の周囲の全周にわたって設けられている。   Further, as shown in FIG. 1, the guide 15 is provided with a discharge opening 21 cut out in a trapezoidal shape that becomes narrower toward the outer periphery at a part of the upper side in the drawing. Further, as shown in FIGS. 3 and 4, notches 22 and 22 with one Y-shaped piece missing are formed in the portion of the guide 15 corresponding to the positions of the bipolar terminals 12 and 13. 4 is a cross-sectional view taken along line BB in FIG. When the laminated battery 1 is manufactured, the electrode body 11 having the bipolar terminals 12 and 13 is stacked on the front side of the guide 15 in FIG. As a result, the bipolar terminals 12 and 13 are overlapped with the back portion 15b of the notch portion 22 and are taken out to the outside. That is, the guide 15 is provided over the entire circumference around the electrode body 11 except for the discharge opening 21.

あるいは，ガイド１５から両極端子１２，１３を外部へ通すための構成は，他のものとしてもよい。
例えば，図５に示すように，３ピース構成としてもよい。すなわち，両極端子１２，１３の幅に相当する分の隙間２３，２３が設けられているのである。この場合には，この隙間２３の位置に両極端子１２，１３が来るように，電極体１１の周囲にガイド１５のそれぞれのピースを配置させることができる。
またあるいは，図６とそのＣ−Ｃ断面である図７に示すように，両極端子１２，１３の位置に相当する位置のＹ字の分岐部に貫通孔２４，２４を設けてもよい。この場合は，両極端子１２，１３は，その先端部がこれらの貫通孔２４，２４を通り抜けることにより，外部へ出されることができる。 Alternatively, the configuration for passing the bipolar terminals 12 and 13 from the guide 15 to the outside may be other.
For example, as shown in FIG. 5, it is good also as a 3 piece structure. That is, gaps 23 and 23 corresponding to the widths of the bipolar terminals 12 and 13 are provided. In this case, each piece of the guide 15 can be arranged around the electrode body 11 so that the bipolar terminals 12 and 13 come to the position of the gap 23.
Alternatively, as shown in FIG. 6 and FIG. 7 which is a CC cross section thereof, the through holes 24 and 24 may be provided in the Y-shaped branch portions at positions corresponding to the positions of the bipolar terminals 12 and 13. In this case, the bipolar terminals 12 and 13 can be brought out to the outside by their tip portions passing through these through holes 24 and 24.

このラミネート電池１は，このようにしてガイド１５と電極体１１とを組み合わせ，その両面からラミネートフィルム１４で挟んでその周囲が溶着されたものである。このとき，ガイド１５の背部１５ｂもラミネートフィルム１４とともに溶着されるので，溶着範囲は，図８に斜線で示す溶着部１６となる。このとき，排出用開口部２１の外部に，溶着幅や溶着時温度等により溶着強度の低い弱溶着部１７を設けてもよい。あるいは，その部分を溶着しないようにしてもよい。   In this laminated battery 1, the guide 15 and the electrode body 11 are combined in this way, and the periphery is welded by sandwiching the laminated film 14 from both sides. At this time, since the back portion 15b of the guide 15 is also welded together with the laminate film 14, the welding range is a welding portion 16 indicated by hatching in FIG. At this time, a weak weld portion 17 having a low welding strength may be provided outside the discharge opening 21 due to the welding width, the welding temperature, or the like. Alternatively, the portion may not be welded.

このように製作されたラミネート電池１では，過充電・短絡等の異常によって電極体１１の内部にガスが発生した場合，そのガスによって内圧が上がり，ラミネートフィルム１４が膨らむ。ここで，本形態のラミネート電池１にはガイド１５が挿入されているので，ガイド１５によってこの内圧が受け止められる。従って，ガイド１５のある部分では溶着部１６に直接大きな力が加わることはない。一方，このガイド１５の無い部分，すなわち排出用開口部２１の部分では，ラミネートフィルム１４の溶着部（例えば，弱溶着部１７）にガスによる内圧が直接加わることとなる。そのため，内圧が非常に大きくなり，ラミネートフィルム１４の変形だけでは対応できなくなった場合には，弱溶着部１７が最初に破壊され，ここからガスが排出される。   In the laminated battery 1 manufactured in this way, when gas is generated inside the electrode body 11 due to an abnormality such as overcharge or short circuit, the internal pressure increases due to the gas, and the laminate film 14 expands. Here, since the guide 15 is inserted in the laminated battery 1 of this embodiment, the internal pressure is received by the guide 15. Therefore, a large force is not directly applied to the welded portion 16 at a portion where the guide 15 is present. On the other hand, in the portion where the guide 15 is not provided, that is, the portion of the discharge opening 21, the internal pressure due to the gas is directly applied to the welded portion (for example, the weak welded portion 17) of the laminate film 14. Therefore, when the internal pressure becomes very large and cannot be dealt with only by the deformation of the laminate film 14, the weakly welded portion 17 is first destroyed, and gas is discharged therefrom.

さらに，ガイド１５と電極体１１との間にはわずかに隙間が設けられているので，電極体１１で発生したガスはその隙間を通って容易に導かれ，破壊された弱溶着部１７から外部へ排出される。すなわち，この隙間がガス流路として作用する。また，ガイド１５の外周側には隙間がないので，ガス流路として作用するのは，ガイド１５と電極体１１との間の隙間のみである。そこで，この排出用開口部２１の外側部分（例えば，弱溶着部１７）をあらかじめガス排出部として，その外部に近接してダクト等の排気設備を設けておけばよい。一般に，このラミネート電池１の使用時には，図１中上方が鉛直上方に配置されるので，ラミネート電池１の内部で発生したガスは弱溶着部１７からスムーズに排出され，安全に処理される。また，ラミネート電池１の製作時には，この排出用開口部２１が電解液の注液口となる。   Further, since a slight gap is provided between the guide 15 and the electrode body 11, the gas generated in the electrode body 11 is easily guided through the gap, and is broken from the weak welded portion 17 to the outside. Is discharged. That is, this gap acts as a gas flow path. Further, since there is no gap on the outer peripheral side of the guide 15, only the gap between the guide 15 and the electrode body 11 acts as a gas flow path. In view of this, an outer portion of the discharge opening 21 (for example, the weak welded portion 17) may be used as a gas discharge portion in advance, and an exhaust facility such as a duct may be provided near the outside. In general, when the laminate battery 1 is used, the upper portion in FIG. 1 is arranged vertically upward, so that the gas generated inside the laminate battery 1 is smoothly discharged from the weak welding portion 17 and processed safely. Further, when the laminated battery 1 is manufactured, the discharge opening 21 serves as an electrolyte injection port.

以上詳細に説明したように，本形態のラミネート電池１によれば，電極体１１の周囲にガイド１５を設けたので溶着部分への応力負荷を防止でき，そのガイド１５に排出用開口部２１を形成したので，排出用開口部２１の外部を確実に最も弱い部分とすることができる。従って，排出用開口部２１の外部をガス排出部としてあらかじめ設定すれば，発生ガスをガス排出部へ的確に導くことができる。さらに，排出用開口部２１の外部の溶着を弱くすれば，さらに確実なガス排出部となる。従って，電池内部で発生したガスをあらかじめ設定されたガス排出部から確実に排出するようにしたラミネート電池１となっている。   As described above in detail, according to the laminated battery 1 of the present embodiment, the guide 15 is provided around the electrode body 11, so that stress load on the welded portion can be prevented, and the discharge opening 21 is provided in the guide 15. Since it is formed, the outside of the discharge opening 21 can be surely made the weakest part. Therefore, if the outside of the discharge opening 21 is set in advance as a gas discharge portion, the generated gas can be accurately guided to the gas discharge portion. Furthermore, if the welding outside the discharge opening 21 is weakened, a more reliable gas discharge portion can be obtained. Therefore, the laminated battery 1 is configured such that the gas generated inside the battery is reliably discharged from a preset gas discharge portion.

次に，本発明を実施した実施例について説明する。以下の手順によって実施例のラミネート電池１を製作し，別に製作した比較例とともに過充電試験を実施した。本発明のラミネート電池１の製作手順を説明する。   Next, examples in which the present invention is implemented will be described. The laminate battery 1 of the example was manufactured according to the following procedure, and an overcharge test was performed together with a comparative example manufactured separately. A manufacturing procedure of the laminated battery 1 of the present invention will be described.

まず，正極材料として，ＬｉＭｎＯ2と５ｗｔ％の炭素粉末をノルマル−２−ピロリドン（ＮＭＰ）にて混合した後，ポリフッ化ビニリデン（ＰＶｄＦ）をＬｉＭｎＯ2に対して２ｗｔ％添加して正極ペーストを製作した。この正極ペーストを厚さ１０μｍのアルミニウム箔上に塗布し，乾燥させて正極電極を製作した。 First, as a positive electrode material, LiMnO 2 and 5 wt% carbon powder were mixed with normal-2-pyrrolidone (NMP), and then 2 wt% of polyvinylidene fluoride (PVdF) was added to LiMnO 2 to produce a positive electrode paste. did. This positive electrode paste was applied onto an aluminum foil having a thickness of 10 μm and dried to produce a positive electrode.

次に，負極材料として，炭素粉末をＮＭＰにて混合し，ＰＶｄＦを２ｗｔ％添加して負極ペーストを製作した。この負極ペーストを厚さ１０μｍの銅箔上に塗布し，乾燥させて負極電極を製作した。   Next, as a negative electrode material, carbon powder was mixed with NMP, and 2 wt% of PVdF was added to prepare a negative electrode paste. This negative electrode paste was applied onto a copper foil having a thickness of 10 μm and dried to produce a negative electrode.

これらの正極電極と負極電極との間に厚さ２５μｍの多孔質ポリエチレン製セパレータを挟み，扁平状に巻き取って電極体１１を製作した。
次に，電極体１１にの正極電極と負極電極とに両極端子１２，１３をそれぞれ超音波溶接にて接合した。 A porous polyethylene separator having a thickness of 25 μm was sandwiched between the positive electrode and the negative electrode, and wound into a flat shape to produce an electrode body 11.
Next, the bipolar terminals 12 and 13 were joined to the positive electrode and the negative electrode of the electrode body 11 by ultrasonic welding, respectively.

次に，電極体１１の周囲に，ＰＰ製のガイド１５を配置した。ここでは，図５に示した３ピースに形成されたタイプのガイド１５を使用した。
そして，Ａｌ層４０μｍ，溶着層（ＰＰ）５０μｍ，表面層（ＰＥＴ）３０μｍの積層構造を持つラミネートフィルム１４によって，これらを両側から包み，熱溶着器にて上辺（ガイド１５の排出用開口部２１が設けられている辺）を除く３辺を熱溶着した。 Next, a PP guide 15 was disposed around the electrode body 11. Here, the guide 15 of the type formed in 3 pieces shown in FIG. 5 was used.
Then, these are wrapped from both sides by a laminate film 14 having a laminated structure of an Al layer 40 μm, a weld layer (PP) 50 μm, and a surface layer (PET) 30 μm, and the upper side (discharge opening 21 of the guide 15 is formed by a heat welder. The three sides except for the side where is provided are thermally welded.

さらに，ＬｉＰＦ6を塩として１ｍｏｌ％添加したエチレンカーボネート／ジエチルカーボネート電解液（比率１：１）を電極体１１に含浸させた。その後，ラミネートフィルム１４の上辺を熱溶着してラミネート電池１を完成させた。このとき，ガス排出部に相当する位置（弱溶着部１７）の熱溶着は，他の部分に比較してやや弱い溶着状態とした。 Further, the electrode body 11 was impregnated with an ethylene carbonate / diethyl carbonate electrolytic solution (ratio 1: 1) added with 1 mol% of LiPF 6 as a salt. Thereafter, the upper side of the laminate film 14 was thermally welded to complete the laminate battery 1. At this time, the thermal welding at the position corresponding to the gas discharge portion (weak welding portion 17) was slightly weaker than the other portions.

また，比較例として，ガイド１５を有しない点以外は全く同じ電池を製作した。比較例においても，同様の位置範囲の溶着をやや弱くした。   As a comparative example, the same battery was manufactured except that the guide 15 was not provided. In the comparative example, the welding in the same position range was slightly weakened.

これらの実施例と比較例とをそれぞれ１０例ずつ製作し，全てに対して同じ条件で過充電試験を実施して，発生ガスが排出された箇所を調べた。本発明の実施例では，１０例の全てが予定されたガス排出部（排出用開口部２１の外側）から排出された。
一方，比較例では，１０例のうち４例のみが予定されたガス排出部から排出された。その他のうち５例では，ガス排出部以外の溶着部がはがれて排出され，１例ではラミネートフィルム１４自体が破損して排出された。
従って，本発明のラミネート電池１によれば，電池内部で発生したガスはあらかじめ設定されたガス排出部から排出されたといえる。 Ten examples of each of these examples and comparative examples were manufactured, and overcharge tests were performed on all of them under the same conditions, and the locations where the generated gas was discharged were examined. In the embodiment of the present invention, all 10 cases were discharged from the scheduled gas discharge portion (outside the discharge opening 21).
On the other hand, in the comparative example, only 4 cases out of 10 cases were discharged from the scheduled gas discharge section. In the other five cases, the welded portion other than the gas discharge portion was peeled off and discharged, and in one example, the laminate film 14 itself was broken and discharged.
Therefore, according to the laminated battery 1 of the present invention, it can be said that the gas generated inside the battery is discharged from a preset gas discharge portion.

なお，本形態は単なる例示にすぎず，本発明を何ら限定するものではない。したがって本発明は当然に，その要旨を逸脱しない範囲内で種々の改良，変形が可能である。
例えば，ガイド１５の断面形状はＹ字に限らず，Ｕ字＋脚形状や，半円＋脚形状としてもよい。また，脚部は必ずしも全周になくてもよい。
また例えば，ガイド１５の角部は丸く形成すれば，さらに好ましい。
また例えば，排出用開口部２１は必ずしも斜め形状の開口で無くてもよい。全体に同一な幅の開口としてもよい。また，排出用開口部２１の配置についてもこれに限るものではないが，一般には，使用時に上方となる位置が望ましい。
また例えば，両極端子１２，１３の位置や形状はこれに限らない。両極端子１２，１３の配置に対応させて，ガイド１５の隙間２２，切り欠き部２３，貫通孔２４等を設定すればよい。 In addition, this form is only a mere illustration and does not limit this invention at all. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
For example, the cross-sectional shape of the guide 15 is not limited to the Y shape, and may be a U shape + leg shape or a semicircle + leg shape. Further, the leg portion does not necessarily have to be on the entire circumference.
For example, it is more preferable if the corners of the guide 15 are formed round.
Further, for example, the discharge opening 21 is not necessarily an oblique opening. It is good also as an opening of the same width as a whole. Further, the arrangement of the discharge opening 21 is not limited to this, but in general, the upper position during use is desirable.
For example, the positions and shapes of the bipolar terminals 12 and 13 are not limited to this. Corresponding to the arrangement of the bipolar terminals 12 and 13, the gap 22, the notch 23, the through hole 24, etc. of the guide 15 may be set.

また例えば，本実施例では，ガス排出部に相当する構成を，他の部分と比較してやや弱い溶着状態とした弱溶着部１７で形成したが，必ずしも弱溶着部１７を形成する必要はない。ガイド１５を設けるだけで排出用開口部２１に電池内部で発生したガスの圧力が集中するので，ガス排出部を他の部分と同等の溶着状態として形成しても，確実にガス排出部を破断し，ガスを電池外部へ排出することができる。なお，この場合には，弱溶着部１７を形成するための工程を削減することができる。   Further, for example, in this embodiment, the configuration corresponding to the gas discharge portion is formed by the weak weld portion 17 that is slightly weaker than the other portions, but the weak weld portion 17 is not necessarily formed. Since the pressure of the gas generated inside the battery is concentrated in the discharge opening 21 simply by providing the guide 15, even if the gas discharge portion is formed in a welded state equivalent to other portions, the gas discharge portion is reliably broken. Gas can be discharged outside the battery. In this case, the process for forming the weak welded portion 17 can be reduced.

本形態に係るラミネート電池の概略を示す正面図である。It is a front view which shows the outline of the laminated battery which concerns on this form. ラミネート電池の概略を示す断面図である。It is sectional drawing which shows the outline of a laminated battery. ラミネート電池に挿入されるガイドを示す正面図である。It is a front view which shows the guide inserted in a laminate battery. ガイドを示す断面図である。It is sectional drawing which shows a guide. ラミネート電池に挿入されるガイドを示す正面図である。It is a front view which shows the guide inserted in a laminate battery. ラミネート電池に挿入されるガイドを示す正面図である。It is a front view which shows the guide inserted in a laminate battery. ガイドを示す断面図である。It is sectional drawing which shows a guide. ラミネート電池の溶着部分を示す説明図である。It is explanatory drawing which shows the welding part of a laminate battery.

符号の説明Explanation of symbols

１ ラミネート電池
１１ 電極体（発電要素）
１２，１３ 両極端子（電極）
１４ ラミネートフィルム
１５ ガイド（ガイド部材）
１５ａ ガス流路部
１５ｂ 背部
１６ 溶着部
１７ 弱溶着部（ガス排出部） 1 Laminated battery 11 Electrode body (power generation element)
12, 13 Bipolar terminal (electrode)
14 Laminate film 15 Guide (guide member)
15a Gas flow path part 15b Back part 16 Welding part 17 Welding part (gas discharge part)

Claims (3)

発電要素と，前記発電要素に接続された両極端子と，前記発電要素を包むラミネートフィルムとを有し，前記ラミネートフィルムの縁辺部が溶着されて溶着部をなし，前記溶着部の一部にガス排出部が設けられるとともに前記両極端子が前記溶着部から突出しているラミネート電池において，
前記発電要素の周囲に前記ガス排出部の箇所を除いて全周にわたって配置されるとともに，前記発電要素の縁辺との間に，前記ガス排出部につながるガス流路を形成するガイド部材を有し，
前記ガイド部材は，前記発電要素とともに前記ラミネートフィルムに包まれていることを特徴とするラミネート電池。 A power generating element, a double-pole terminal connected to the power generating element, the wrap power generating element and a laminate film, without the welded portion edge portion is welded of the laminate film, a portion of the weld portion in the laminate battery, wherein with gas outlet is provided with two electrode terminals protruding from the welding portion,
A guide member that is disposed around the power generation element except for the gas discharge portion, and that forms a gas flow path connected to the gas discharge portion between the power generation element and an edge. ,
The laminated battery, wherein the guide member is wrapped in the laminated film together with the power generation element. 請求項１に記載するラミネート電池において，
前記ガイド部材は，前記発電要素に向かって開いたガス流路部と，その外側の背部とを有し，
前記溶着部では，前記ラミネートフィルムが前記ガイド部材の背部にも溶着されていることを特徴とするラミネート電池。 The laminated battery according to claim 1 ,
The guide member has a gas flow path portion that opens toward the power generation element, and a back portion on the outside thereof,
In the welding portion, the laminated film is also welded to the back portion of the guide member. 請求項１または請求項２に記載するラミネート電池において，
前記ガイド部材は，前記ラミネートフィルムより剛性の高い部材であることを特徴とするラミネート電池。 In the laminate battery according to claim 1 or 2 ,
The laminated battery according to claim 1, wherein the guide member is a member having higher rigidity than the laminated film.
JP2004031498A 2004-02-09 2004-02-09 Laminated battery Expired - Fee Related JP4617679B2 (en)

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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005096412A1 (en) * 2004-03-31 2005-10-13 Nec Lamilion Energy, Ltd. Electrical device with film covering, frame member, and housing system for electrical device with film covering
JP2007087922A (en) * 2005-03-04 2007-04-05 Toyota Motor Corp Film package energy storage device
JP5175453B2 (en) * 2006-05-25 2013-04-03 日本電気株式会社 Film exterior electrical device
KR100876455B1 (en) 2006-07-31 2008-12-29 주식회사 엘지화학 Pouch type secondary battery with unsealed surplus
JP5011928B2 (en) * 2006-10-03 2012-08-29 株式会社Ｇｓユアサ battery
JP5987336B2 (en) 2011-03-25 2016-09-07 日本電気株式会社 Secondary battery
KR101602466B1 (en) * 2012-11-28 2016-03-10 주식회사 엘지화학 Pouch type secondary battery and method for manufacturing the same
JP6245468B2 (en) * 2013-09-12 2017-12-13 住友金属鉱山株式会社 Nonaqueous electrolyte secondary battery laminate cell and laminate cell holder for evolved gas evaluation
US10014497B2 (en) 2014-02-14 2018-07-03 Lg Chem, Ltd. Pouch-type secondary battery including sealed part having recess
KR20170050926A (en) * 2015-11-02 2017-05-11 주식회사 엘지화학 A secondary battery, secondary battery charging system and secondary battery production method to prevent battery cell swelling by detecting a displacement of gas venting unit
CN205406573U (en) * 2016-03-02 2016-07-27 宁德时代新能源科技股份有限公司 Soft packet of secondary cell casing
JP7459774B2 (en) 2020-11-30 2024-04-02 株式会社豊田自動織機 Energy storage cells and energy storage devices

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000277066A (en) * 1999-03-29 2000-10-06 Japan Storage Battery Co Ltd Non-aqueous electrolyte secondary battery
JP2001325926A (en) * 2000-05-15 2001-11-22 Awa Eng Co Manufacturing method of battery with laminated sheet as outer package case
JP2004055171A (en) * 2002-07-16 2004-02-19 Nec Corp Film armor body, its manufacturing method, and film armored battery

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000277066A (en) * 1999-03-29 2000-10-06 Japan Storage Battery Co Ltd Non-aqueous electrolyte secondary battery
JP2001325926A (en) * 2000-05-15 2001-11-22 Awa Eng Co Manufacturing method of battery with laminated sheet as outer package case
JP2004055171A (en) * 2002-07-16 2004-02-19 Nec Corp Film armor body, its manufacturing method, and film armored battery

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