JP2021170513A - Battery cell and assembly battery using the same - Google Patents

Battery cell and assembly battery using the same Download PDF

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JP2021170513A
JP2021170513A JP2020073883A JP2020073883A JP2021170513A JP 2021170513 A JP2021170513 A JP 2021170513A JP 2020073883 A JP2020073883 A JP 2020073883A JP 2020073883 A JP2020073883 A JP 2020073883A JP 2021170513 A JP2021170513 A JP 2021170513A
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battery
battery cell
expansion
power storage
storage element
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JP7331765B2 (en
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亨 井上
Toru Inoue
秀世 森田
Hideyo Morita
雄司 上原
Yuji Uehara
紀男 小山
Norio Koyama
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TDK Corp
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TDK 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

Abstract

To provide a battery cell and a battery pack which have an excellent burning prevention property.SOLUTION: A battery cell 3 includes: a power storage element 12; a storage unit 4 for storing the power storage element 12; an electrode terminal 6 connected to the power storage element, the electrode terminal being drawn to the outside of the storage unit 4; and an expansion unit 10 connected to the storage unit 4 in the inside. Gas generated from the power storage element 12 at heat generation flows into the expansion unit 10 and makes the expansion unit 10 expand so that the distance between battery cells 3 increases. A large heat discharge route can be thus formed and the burning prevention property is improved.SELECTED DRAWING: Figure 3

Description

本発明は、類焼防止性に優れた電池セル及びこれを用いた組電池に関する。 The present invention relates to a battery cell having excellent fire-prevention properties and an assembled battery using the same.

近年、携帯電話やパソコン等の電子機器のコードレス化が急速に進んでおり、これらの駆動用電源として、小型、軽量で高エネルギー密度を有する二次電池の利用が高まっている。このような状況下において、充放電容量が大きく、高エネルギー密度を有するリチウムイオン二次電池が注目されている。 In recent years, the cordless operation of electronic devices such as mobile phones and personal computers has rapidly progressed, and the use of small, lightweight, and high energy density secondary batteries is increasing as a power source for driving these devices. Under such circumstances, a lithium ion secondary battery having a large charge / discharge capacity and a high energy density has attracted attention.

また、使用用途の電圧又は電流量に応じて、複数の電池セルを直列又は並列に接続し供給電圧又は電流量を所望の値に設定して使用する場合がある。複数の電池を直列又は並列に接続する方法として、バスバーにより端子を接続する方法がある。 Further, depending on the voltage or current amount of the intended use, a plurality of battery cells may be connected in series or in parallel, and the supply voltage or current amount may be set to a desired value for use. As a method of connecting a plurality of batteries in series or in parallel, there is a method of connecting terminals by a bus bar.

特開２０１９−１４００８２号公報Japanese Unexamined Patent Publication No. 2019-14802 国際公開ＷＯ２０１９／１５１０３６号公報International Publication WO2019 / 151036

リチウムイオン二次電池として、複数のリチウムイオン二次電池セルを組み合わせてなる組電池が考案されている。しかし、リチウムイオン二次電池においては、電解液の酸化等による発熱、金属リチウムの析出等による短絡などに起因して電池セルが発熱し、燃焼ガスが発生する場合があり、他の電池セルへの類焼を防止するための類焼防止構造が必要となる。 As a lithium ion secondary battery, an assembled battery formed by combining a plurality of lithium ion secondary battery cells has been devised. However, in a lithium ion secondary battery, the battery cell may generate heat due to heat generation due to oxidation of the electrolytic solution, short circuit due to precipitation of metallic lithium, etc., and combustion gas may be generated. A fire-fighting prevention structure is required to prevent fire-fighting.

本発明は、上記課題に鑑みてなされたものであり、その目的は、類焼防止性に優れた電池セル及びこれを用いた組電池を提供することである。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a battery cell having excellent fire-prevention properties and an assembled battery using the same.

本発明による電池セルは、蓄電要素と、蓄電要素を内部に格納する格納部と、蓄電要素に接続され、格納部の外に引き出された電極端子と、格納部と連通する膨張部とを備えることを特徴とする。また、本発明において、格納部及び膨張部はラミネートフィルムにより構成されていても構わない。また、格納部及び膨張部の内部は気密に構成されていても構わない。 The battery cell according to the present invention includes a power storage element, a storage unit that stores the power storage element inside, an electrode terminal that is connected to the power storage element and is drawn out of the storage unit, and an expansion unit that communicates with the storage unit. It is characterized by that. Further, in the present invention, the storage portion and the expansion portion may be made of a laminated film. Further, the inside of the storage portion and the expansion portion may be airtightly configured.

本発明によれば、発熱時に蓄電要素から発生するガスによって、膨張部が膨張することにより電池セル間距離が大きくなる。これによって、放熱経路が形成されることにより組電池の冷却効果が向上するため、類焼防止性を向上させることが可能となる。 According to the present invention, the gas generated from the power storage element during heat generation causes the expansion portion to expand, so that the distance between the battery cells increases. As a result, the heat dissipation path is formed to improve the cooling effect of the assembled battery, so that it is possible to improve the fire-prevention property.

本発明において、膨張部と格納部の間には、蓄電要素の発熱によりガスが発生した場合に、格納部の内部圧力の上昇により外れる仮留め部が設けられていても構わない。これによれば、発熱時に蓄電要素から発生するガスにより、格納部の内部圧力が所定の圧力まで高くなった場合に仮留めが外れて、ガスが勢いよく膨張部に流入する。これにより、膨張部が勢いよく膨張して電池セル間距離がより大きくなり、放熱経路をより大きく形成することができる。これにより組電池の冷却効果が向上するため、類焼防止性を向上させることが可能となる。 In the present invention, a temporary fastening portion may be provided between the expansion portion and the storage portion, which is released by an increase in the internal pressure of the storage portion when gas is generated due to heat generation of the power storage element. According to this, when the internal pressure of the storage portion rises to a predetermined pressure due to the gas generated from the power storage element during heat generation, the temporary fastening is released and the gas vigorously flows into the expansion portion. As a result, the expansion portion expands vigorously, the distance between the battery cells becomes larger, and the heat dissipation path can be formed larger. As a result, the cooling effect of the assembled battery is improved, so that it is possible to improve the fire-prevention property.

本発明において、膨張部には、膨張部の所定の領域が溶着される面溶着部が設けられていても構わない。これによれば、膨張部の膨張部分を小さくすることで、より少ないガス量により膨張部の膨張量を大きくすることができる。このため、より少ないガス量で電池セル間距離を大きくすることが可能となる。従って、放熱経路をより大きく形成することにより組電池の冷却効果が向上するため、類焼防止性を向上させることが可能となる。 In the present invention, the expansion portion may be provided with a surface welding portion into which a predetermined region of the expansion portion is welded. According to this, by reducing the expanded portion of the expanded portion, the expanded amount of the expanded portion can be increased with a smaller amount of gas. Therefore, it is possible to increase the distance between the battery cells with a smaller amount of gas. Therefore, by forming the heat dissipation path larger, the cooling effect of the assembled battery is improved, and it is possible to improve the fire-prevention property.

本発明による組電池は、上記の電池セルを並べて組み合わせたものであって、膨張部はいずれかの隣接する電池セルの間に配置されていることを特徴とする。本発明によれば、発熱時に蓄電要素から発生するガスによって、膨張部が膨張することにより電池セル間距離が大きくなり、放熱経路を形成することができる。これにより、組電池の冷却効果が向上するため、類焼防止性を向上させることが可能となる。 The assembled battery according to the present invention is a combination of the above battery cells arranged side by side, and is characterized in that an expansion portion is arranged between any adjacent battery cells. According to the present invention, the gas generated from the power storage element during heat generation causes the expansion portion to expand, so that the distance between the battery cells increases, and a heat dissipation path can be formed. As a result, the cooling effect of the assembled battery is improved, so that it is possible to improve the fire-prevention property.

このように、本発明によれば、類焼防止性に優れた電池セル及び組電池を提供することができる。 As described above, according to the present invention, it is possible to provide a battery cell and an assembled battery having excellent fire-prevention properties.

図１は、本発明の第１実施形態による電池セル３及び組電池１の外観の概略を示す斜視図である。FIG. 1 is a perspective view showing an outline of the appearance of the battery cell 3 and the assembled battery 1 according to the first embodiment of the present invention. 図２は、本発明の第１実施形態による電池セル３の配列状態の概略構成を示す側面図である。FIG. 2 is a side view showing a schematic configuration of an arrangement state of the battery cells 3 according to the first embodiment of the present invention. 図３は、本発明の第１実施形態による電池セル３の配列状態の概略構成を示す側面図であり、発熱によるガス発生時の状況の概略を示す図である。FIG. 3 is a side view showing a schematic configuration of an arrangement state of the battery cells 3 according to the first embodiment of the present invention, and is a diagram showing an outline of a situation when gas is generated due to heat generation. 図４は、本発明の第２実施形態による電池セル１４の外観の概略を示す斜視図である。FIG. 4 is a perspective view showing an outline of the appearance of the battery cell 14 according to the second embodiment of the present invention. 図５は、本発明の第３実施形態による電池セル１８の外観の概略を示す斜視図である。FIG. 5 is a perspective view showing an outline of the appearance of the battery cell 18 according to the third embodiment of the present invention.

以下、添付図面を参照しながら、本発明の好ましい実施形態について詳細に説明する。なお、以下の説明において、すでに説明した部材と同様の部材には同様の符号又は名称を付し、その説明については省略する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same members as those already described will be given the same reference numerals or names, and the description thereof will be omitted.

（第１実施形態）
第１実施形態に係る電池セル３及びこれを用いた組電池１について、図１から図３を参照して説明する。図１は、本発明の第１実施形態による電池セル３及びこれを用いた組電池１の外観の概略を示す斜視図である。図２は、本発明の第１実施形態による電池セル３の配列状態の概略構成を示す側面図である。図３は、本発明の第１実施形態による電池セル３の配列状態の概略構成を示す側面図であり、発熱によるガス発生時の状況の概略を示す図である。 (First Embodiment)
The battery cell 3 according to the first embodiment and the assembled battery 1 using the battery cell 3 will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing an outline of the appearance of the battery cell 3 according to the first embodiment of the present invention and the assembled battery 1 using the same. FIG. 2 is a side view showing a schematic configuration of an arrangement state of the battery cells 3 according to the first embodiment of the present invention. FIG. 3 is a side view showing a schematic configuration of an arrangement state of the battery cells 3 according to the first embodiment of the present invention, and is a diagram showing an outline of a situation when gas is generated due to heat generation.

図１に示すように、組電池１は、複数の電池セル３を組み合わせて並べて配置されたものであり、バスバー２ａにより電池セル３が並列又は直列となるように接続されて構成されている。電池セル３は、例えばリチウムイオン電池セルである。図２に示すように、電池セル３は、内部空洞の格納部４及び膨張部１０を備えている。格納部４の内部には、図示しない電極シート、電解質、及びセパレータ等を含む蓄電要素１２が格納されている。 As shown in FIG. 1, the assembled battery 1 is a combination of a plurality of battery cells 3 arranged side by side, and is configured by connecting the battery cells 3 in parallel or in series by a bus bar 2a. The battery cell 3 is, for example, a lithium ion battery cell. As shown in FIG. 2, the battery cell 3 includes a storage portion 4 and an expansion portion 10 of an internal cavity. Inside the storage unit 4, a power storage element 12 including an electrode sheet, an electrolyte, a separator and the like (not shown) is stored.

電池セル３には、蓄電要素１２に接続された電極端子６が設けられており、格納部４の外に引き出されている。電極端子６の一方は正極、他方は負極となる。バスバー２ａは例えば金属銅で構成されており、基板２上に固定されている。基板２及びバスバー２ａは、電極端子６を装着するための端子差し込み口２ｂを備えている。電池セル３を組み合わせて組電池１を構成する際には、電極端子６をバスバー２ａの端子差し込み口２ｂに差し込むことにより複数の電池セル３を電気的に接続する。 The battery cell 3 is provided with an electrode terminal 6 connected to the power storage element 12, and is pulled out of the storage unit 4. One of the electrode terminals 6 is a positive electrode and the other is a negative electrode. The bus bar 2a is made of, for example, metallic copper and is fixed on the substrate 2. The substrate 2 and the bus bar 2a are provided with a terminal insertion port 2b for mounting the electrode terminal 6. When the battery cells 3 are combined to form the assembled battery 1, the plurality of battery cells 3 are electrically connected by inserting the electrode terminals 6 into the terminal insertion ports 2b of the bus bar 2a.

格納部４及び膨張部１０はラミネートフィルムで構成されている。ラミネートフィルムは、複数のフィルムを積層させたフィルムであり、例えば、金属フィルムの両面上に樹脂フィルムを積層させたものを用いることができる。ラミネートフィルムは電池セル３の外装、すなわち、格納部４及び膨張部１０の外装となる。 The storage portion 4 and the expansion portion 10 are made of a laminated film. The laminated film is a film in which a plurality of films are laminated, and for example, a film in which a resin film is laminated on both sides of a metal film can be used. The laminated film serves as the exterior of the battery cell 3, that is, the exterior of the storage portion 4 and the expansion portion 10.

実施形態に係る電池セル３では、格納部４と膨張部１０とを、ラミネートフィルムにより一体的に形成している。格納部４と膨張部１０は、内部空間が連通するように構成されている。膨張部１０は、ラミネートフィルムの端部において封止部１１が形成されており、ラミネートフィルムを溶着して内部が気密になるように閉じられている。このようにして、相互に連通する格納部４及び膨張部１０の内部空間は密閉されている。複数の電池セル３を並列させて組電池１を構成する際には、ラミネートフィルムを電池セル３の下端部で上方向に折り曲げ、膨張部１０がいずれかの隣接する電池セル３の間に配置されるように構成している。 In the battery cell 3 according to the embodiment, the storage portion 4 and the expansion portion 10 are integrally formed by a laminated film. The storage portion 4 and the expansion portion 10 are configured so that the internal spaces communicate with each other. The expansion portion 10 has a sealing portion 11 formed at the end of the laminated film, and is closed so that the inside is airtight by welding the laminated film. In this way, the internal spaces of the storage portion 4 and the expansion portion 10 communicating with each other are sealed. When a plurality of battery cells 3 are arranged in parallel to form an assembled battery 1, the laminated film is bent upward at the lower end of the battery cells 3 and the expansion portion 10 is arranged between any adjacent battery cells 3. It is configured to be done.

電池セル３内の蓄電要素１２が発熱した場合には、図３に示すように、格納部４内部で発生したガスは、格納部４の内部空間から、膨張部１０の内部空間に流入する。これにより、膨張部１０は膨張する。膨張部１０は、隣接する電池セル３の間に配置されているため、膨張部１０が膨張すると、電池セル３を押し退け、隣接する電池セル３の間の距離である電池セル間距離Ｄが大きくなる。電池セル間距離Ｄが大きくなることで、隣接する電池セル３の間に放熱経路を形成することができる。これにより組電池１の冷却効果が向上し、発熱が抑制されるため、他の電池セル３への類焼が防止される。 When the power storage element 12 in the battery cell 3 generates heat, as shown in FIG. 3, the gas generated inside the storage unit 4 flows into the internal space of the expansion unit 10 from the internal space of the storage unit 4. As a result, the expansion portion 10 expands. Since the expansion unit 10 is arranged between the adjacent battery cells 3, when the expansion unit 10 expands, the battery cell 3 is pushed away, and the distance D between the battery cells, which is the distance between the adjacent battery cells 3, is large. Become. By increasing the distance D between the battery cells, a heat dissipation path can be formed between the adjacent battery cells 3. As a result, the cooling effect of the assembled battery 1 is improved and heat generation is suppressed, so that burning to other battery cells 3 is prevented.

第１実施形態に係る組電池１及び電池セル３によれば以下の効果を得る。 According to the assembled battery 1 and the battery cell 3 according to the first embodiment, the following effects are obtained.

第１実施形態に係る電池セル３は、電極シート、電解質、及びセパレータを含む蓄電要素１２と、蓄電要素１２を内部に格納する格納部４と、電極シートに接続し、格納部４の外に引き出された電極端子６と、内部が格納部４と連通する膨張部１０とを備えている。また、格納部４及び膨張部１０はラミネートフィルムにより構成されている。また、格納部４及び膨張部１０の内部は気密に構成されている。第１実施形態に係る組電池１は、複数の電池セル３を並べて組み合わせたものであって、膨張部１０はいずれかの隣接する電池セル３の間に配置されている。 The battery cell 3 according to the first embodiment is connected to a power storage element 12 including an electrode sheet, an electrolyte, and a separator, a storage unit 4 for storing the power storage element 12 inside, and an electrode sheet, and is connected to the outside of the storage unit 4. It includes a pulled-out electrode terminal 6 and an expansion portion 10 whose inside communicates with the storage portion 4. Further, the storage portion 4 and the expansion portion 10 are made of a laminated film. Further, the insides of the storage portion 4 and the expansion portion 10 are airtightly configured. The assembled battery 1 according to the first embodiment is a combination of a plurality of battery cells 3 arranged side by side, and the expansion portion 10 is arranged between any adjacent battery cells 3.

上記実施形態によれば、発熱時に電池セル３内の蓄電要素１２から発生するガスによって、膨張部１０が膨張することにより電池セル間距離Ｄが大きくなり、電池セル３間に放熱経路を形成することができる。これにより、組電池１の冷却効果が向上するため、類焼を防止することが可能となる。 According to the above embodiment, the gas generated from the power storage element 12 in the battery cell 3 during heat generation causes the expansion portion 10 to expand, thereby increasing the distance D between the battery cells and forming a heat dissipation path between the battery cells 3. be able to. As a result, the cooling effect of the assembled battery 1 is improved, and it is possible to prevent burning.

（第２実施形態）
第２実施形態に係る電池セル１４について、図４を参照して説明する。 (Second Embodiment)
The battery cell 14 according to the second embodiment will be described with reference to FIG.

図４に示すように、第２実施形態に係る電池セル１４は、格納部１５及び膨張部１６を備えている。第２実施形態においては、格納部１５と膨張部１６との間に、仮留め部１７が設けられている。仮留め部１７は、電池セル１４の外装を構成するラミネートフィルムを溶着することにより構成されている。仮留め部１７は、格納部１５の内部に格納される蓄電要素の発熱によりガスが発生した場合に、格納部１５の内部圧力が所定の圧力に上昇した場合に外れる程度の強度で溶着されている。 As shown in FIG. 4, the battery cell 14 according to the second embodiment includes a storage unit 15 and an expansion unit 16. In the second embodiment, a temporary fastening portion 17 is provided between the storage portion 15 and the expansion portion 16. The temporary fastening portion 17 is formed by welding a laminate film constituting the exterior of the battery cell 14. The temporary fastening portion 17 is welded with such a strength that it will come off when the internal pressure of the storage portion 15 rises to a predetermined pressure when gas is generated due to the heat generation of the power storage element stored inside the storage portion 15. There is.

これによれば、発熱時に格納部１５内の蓄電要素から発生するガスにより、格納部１５の内部圧力が所定の圧力まで上昇した場合に仮留めが外れて、ガスが勢いよく膨張部１６に流入する。これにより、膨張部１６が勢いよく膨張し、電池セル間距離Ｄがより大きくなるため、電池セル１４間の放熱経路をより大きく形成することができる。これにより、組電池１の冷却効果が向上するため、優れた類焼防止効果を得る。 According to this, when the internal pressure of the storage unit 15 rises to a predetermined pressure due to the gas generated from the power storage element in the storage unit 15 during heat generation, the temporary fastening is released and the gas flows into the expansion unit 16 vigorously. do. As a result, the expansion portion 16 expands vigorously and the distance D between the battery cells becomes larger, so that the heat dissipation path between the battery cells 14 can be formed larger. As a result, the cooling effect of the assembled battery 1 is improved, so that an excellent burning prevention effect can be obtained.

（第３実施形態）
第３実施形態に係る電池セル１８について、図５を参照して説明する。 (Third Embodiment)
The battery cell 18 according to the third embodiment will be described with reference to FIG.

図５に示すように、第２実施形態に係る電池セル１８は、格納部１９、及び膨張部２０を備えている。膨張部２０には、図５において左右に配置される第１膨張部２０ａ、及び、第２膨張部２０ｂが設けられている。格納部１９と、膨張部２０ａ、２０ｂの内部は連通している。膨張部２０の中央であって、第１膨張部２０ａと第２膨張部２０ｂとの間には、面溶着部２０ｃが設けられている。面溶着部２０ｃは、電池セル３の外装を構成するラミネートフィルムの所定の領域が全面的に溶着されたものであり、面溶着部２０ｃにはガスは流入することなく、溶着状態が保持される。従って、第１膨張部２０ａ及び第２膨張部２０ｂの内部に流入させることができるガス量は、第１実施形態に係る膨張部１０に比べて、より少ないガス量により膨張させることが可能となる。 As shown in FIG. 5, the battery cell 18 according to the second embodiment includes a storage unit 19 and an expansion unit 20. The expansion portion 20 is provided with a first expansion portion 20a and a second expansion portion 20b arranged on the left and right in FIG. The storage portion 19 and the insides of the expansion portions 20a and 20b communicate with each other. A surface welding portion 20c is provided in the center of the expansion portion 20 between the first expansion portion 20a and the second expansion portion 20b. The surface-welded portion 20c is formed by completely welding a predetermined region of the laminate film constituting the exterior of the battery cell 3, and the welded state is maintained without gas flowing into the surface-welded portion 20c. .. Therefore, the amount of gas that can flow into the inside of the first expansion portion 20a and the second expansion portion 20b can be expanded with a smaller amount of gas as compared with the expansion portion 10 according to the first embodiment. ..

これによれば、膨張部２０に面溶着部２０ｃを設けることで、膨張部分である第１膨張部２０ａと第２膨張部２０ｂを小さく構成することができる。これにより、より少ないガス量により膨張部２０の膨張量を大きくできるため、より少ないガス量で電池セル間距離Ｄを大きくすることが可能となる。このため、放熱経路をより大きく形成することにより類焼を防止する効果を向上させることが可能となる。 According to this, by providing the surface welding portion 20c in the expansion portion 20, the first expansion portion 20a and the second expansion portion 20b, which are the expansion portions, can be made smaller. As a result, the expansion amount of the expansion portion 20 can be increased with a smaller amount of gas, so that the distance D between the battery cells can be increased with a smaller amount of gas. Therefore, it is possible to improve the effect of preventing burning by forming a larger heat dissipation path.

以上、本発明の好ましい実施形態について説明したが、本発明は、上記の実施形態に限定されることなく、本発明の主旨を逸脱しない範囲で種々の変更が可能であり、それらも本発明の範囲内に包含されるものであることはいうまでもない。 Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention, and these are also the present invention. Needless to say, it is included in the range.

Ｄ 電池セル間距離
１ 組電池
２ 基板
２ａ バスバー
２ｂ 端子差し込み口
３、１４、１８ 電池セル
４、１５、１９ 格納部
６ 電極端子
１０、１６、２０ 膨張部
１１ 封止部
１２ 蓄電要素
１７ 仮留め部
２０ａ 第１膨張部
２０ｂ 第２膨張部
２０ｃ 面溶着部 D Distance between battery cells 1 set Battery 2 Board 2a Bus bar 2b Terminal insertion port 3, 14, 18 Battery cell 4, 15, 19 Storage part 6 Electrode terminal 10, 16, 20 Expansion part 11 Sealing part 12 Storage element 17 Temporary fastening Part 20a First expansion part 20b Second expansion part 20c Surface welding part

Claims (6)

蓄電要素と、
前記蓄電要素を内部に格納する格納部と、
前記蓄電要素に接続され、前記格納部の外に引き出された電極端子と、
内部が前記格納部と連通する膨張部と、を備えることを特徴とする電池セル。 Power storage element and
A storage unit that stores the power storage element inside,
An electrode terminal connected to the power storage element and pulled out of the storage unit,
A battery cell including an expansion portion whose inside communicates with the storage portion. 前記格納部及び前記膨張部はラミネートフィルムにより構成されていることを特徴とする請求項１に記載の電池セル。 The battery cell according to claim 1, wherein the storage portion and the expansion portion are made of a laminated film. 前記格納部及び前記膨張部の内部は気密に構成されていることを特徴とする請求項１又は２に記載の電池セル。 The battery cell according to claim 1 or 2, wherein the inside of the storage portion and the expansion portion is airtightly configured. 前記膨張部と前記格納部の間には、前記蓄電要素の発熱によりガスが発生した場合に、前記格納部の内部圧力の上昇により外れる仮留め部が設けられていることを特徴とする請求項１乃至３のいずれか一項に記載の電池セル。 The claim is characterized in that a temporary fastening portion is provided between the expansion portion and the storage portion, which is released by an increase in the internal pressure of the storage portion when gas is generated due to heat generation of the power storage element. The battery cell according to any one of 1 to 3. 前記膨張部には、前記膨張部の所定の領域が溶着される面溶着部が設けられていることを特徴とする請求項１乃至３のいずれか一項に記載の電池セル。 The battery cell according to any one of claims 1 to 3, wherein the expanded portion is provided with a surface welded portion into which a predetermined region of the expanded portion is welded. 請求項１乃至５のいずれか一項に記載の複数の電池セルを並べて組み合わせた組電池であって、前記膨張部はいずれかの隣接する前記電池セルの間に配置されていることを特徴とする組電池。 An assembled battery in which a plurality of battery cells according to any one of claims 1 to 5 are arranged side by side, and the expansion portion is arranged between any adjacent battery cells. Assembled battery.
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