JP2019145478A - Power storage device and power storage module - Google Patents

Power storage device and power storage module Download PDF

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JP2019145478A
JP2019145478A JP2018031357A JP2018031357A JP2019145478A JP 2019145478 A JP2019145478 A JP 2019145478A JP 2018031357 A JP2018031357 A JP 2018031357A JP 2018031357 A JP2018031357 A JP 2018031357A JP 2019145478 A JP2019145478 A JP 2019145478A
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storage device
electrode
current collector
collector plate
power storage
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JP7340804B2 (en
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詠子 石井
Eiko Ishii
詠子 石井
俊明 清水
Toshiaki Shimizu
俊明 清水
東吾 遠藤
Togo Endo
東吾 遠藤
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Panasonic Intellectual Property Management Co Ltd
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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
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Abstract

To provide a power storage device capable of reducing resistance.SOLUTION: A power storage device 1 according to the present invention includes a winding body 2, a case 3, and a current collector plate 4. The winding body 2 includes a first electrode 21 and a second electrode 22 wound around the winding axis X, and a first electrode 21 is exposed at the first winding end 24 located at one end in the X direction of the winding axis. The case 3 has a cylindrical shape that houses the winding body 2 and has a bottom portion 30. The current collecting plate 4 is further electrically and mechanically connected to the first electrode 21 at the first winding end 24 and further includes a current collecting plate 4 positioned between the first winding end 24 and the bottom portion 30.SELECTED DRAWING: Figure 1

Description

本開示は、一般に蓄電デバイス及び蓄電モジュールに関し、詳細には、ケース内に巻回体が収容された蓄電デバイスと、この蓄電デバイスを複数含む蓄電モジュールに関する。   The present disclosure generally relates to a power storage device and a power storage module, and more particularly, to a power storage device in which a wound body is accommodated in a case and a power storage module including a plurality of the power storage devices.

従来、巻回された正極部材及び負極部材が含まれる巻回体がケース内に収容された蓄電デバイスが知られている。このような蓄電デバイスとして、リチウムイオン電池（ＬＩＢ：Lithium Ion Battery）等の二次電池、リチウムイオンキャパシタ（ＬＩＣ：LithiumIon Capacitor）、電気二重層キャパシタ（ＥＤＬＣ：Electric Double-Layer Capacitor）等の電気化学デバイスが挙げられる。   Conventionally, an electricity storage device in which a wound body including a wound positive electrode member and negative electrode member is accommodated in a case is known. Such power storage devices include secondary batteries such as lithium ion batteries (LIB), electrochemistry such as lithium ion capacitors (LIC) and electric double layer capacitors (EDLC). Device.

例えば特許文献１には、捲回された正極、負極及びセパレータを含む電極群が、非水電解液とともに有底ケース内に収容された蓄電デバイスが記載されている。特許文献１の蓄電デバイスでは、正極及び負極に棒状のリードタブが一つずつ接続されている。例えば特許文献２には、捲回された第１電極、第２電極及びセパレータを含むコンデンサ素子が、電解液とともに有底円筒状のケース内に収容されることが記載されている。また特許文献２には、コンデンサ素子の一方の端面に露出した第１電極とケース内面とを、ケース外面からのレーザ溶接によって接続することが記載されている。   For example, Patent Document 1 describes an electricity storage device in which an electrode group including a wound positive electrode, negative electrode, and separator is housed in a bottomed case together with a non-aqueous electrolyte. In the electric storage device of Patent Document 1, one rod-like lead tab is connected to each of the positive electrode and the negative electrode. For example, Patent Document 2 describes that a capacitor element including a wound first electrode, a second electrode, and a separator is accommodated in a bottomed cylindrical case together with an electrolytic solution. Patent Document 2 describes that the first electrode exposed on one end face of the capacitor element and the case inner surface are connected by laser welding from the case outer surface.

国際公開第２０１７／１３０８５５号International Publication No. 2017/130855 国際公開第２００７／０６９５３８号International Publication No. 2007/069538

特許文献１に記載の蓄電デバイスでは、リードタブのみを介して電力のやりとりが行われるが、リードタブと正極（又は負極）とが接続されている面積（集電面積）が少ないため、蓄電デバイスの抵抗値が大きくなる傾向があった。また特許文献２の接続方法では、ケース内面と電極との集電面積を確保でき、低抵抗化できるものの、ケース内に電極を収容した状態では、ケース内面と電極との接続が困難であった。   In the power storage device described in Patent Document 1, power is exchanged only through the lead tab, but since the area (current collection area) where the lead tab and the positive electrode (or negative electrode) are connected is small, the resistance of the power storage device There was a tendency for the value to increase. Moreover, in the connection method of patent document 2, although the current collection area of a case inner surface and an electrode can be ensured and resistance can be reduced, in the state which accommodated the electrode in the case, it was difficult to connect a case inner surface and an electrode. .

本開示の目的は、低抵抗化された蓄電デバイスと、それを備える蓄電モジュールとを提供することにある。   An object of the present disclosure is to provide a power storage device with a reduced resistance and a power storage module including the power storage device.

本開示の一態様に係る蓄電デバイスは、巻回体と、ケースと、を備え、集電板を更に備える。前記巻回体は、巻回軸の周囲に巻回された第１電極及び第２電極を含み、前記巻回軸方向の一端に位置する第１巻回端において前記第１電極が露出している。前記ケースは、前記巻回体を収容し、底部を有する筒状である。前記集電板は、前記第１巻回端における前記第１電極と電気的かつ機械的に接続され、かつ、前記第１巻回端と前記底部との間に位置する。   An electricity storage device according to one embodiment of the present disclosure includes a wound body and a case, and further includes a current collector plate. The wound body includes a first electrode and a second electrode wound around a winding shaft, and the first electrode is exposed at a first winding end located at one end in the winding shaft direction. Yes. The case has a cylindrical shape that houses the wound body and has a bottom. The current collector plate is electrically and mechanically connected to the first electrode at the first winding end, and is located between the first winding end and the bottom portion.

本開示の一態様に係る蓄電モジュールは、前記蓄電デバイスを複数含み、複数の前記蓄電デバイスは、導電性を有する導電部材によって電気的かつ機械的に接続されている。   The power storage module according to one embodiment of the present disclosure includes a plurality of the power storage devices, and the plurality of power storage devices are electrically and mechanically connected by a conductive member having conductivity.

本開示には、蓄電デバイス及び蓄電モジュールを低抵抗化できるという利点がある。   The present disclosure has an advantage that the resistance of the power storage device and the power storage module can be reduced.

図１は、本開示の一実施形態に係る蓄電デバイスを示す概略の断面図である。FIG. 1 is a schematic cross-sectional view showing an electricity storage device according to an embodiment of the present disclosure. 図２Ａは、同上の蓄電デバイスが備える巻回体の構成を示す概略の斜視図である。図２Ｂは、図２Ａに示す巻回体の概略の底面図である。FIG. 2A is a schematic perspective view illustrating a configuration of a wound body included in the above electricity storage device. FIG. 2B is a schematic bottom view of the wound body shown in FIG. 2A. 図３は、同上の蓄電デバイスが備える集電板を示す概略の平面図である。FIG. 3 is a schematic plan view showing a current collector plate included in the above electricity storage device. 図４Ａは、同上の蓄電デバイスの一部を拡大した概略の断面図である。図４Ｂは、図４Ａに示す蓄電デバイスの概略の底面図である。図４Ｃは、図４Ａに示す蓄電デバイスの溝が開裂する様子を示す説明図である。FIG. 4A is an enlarged schematic cross-sectional view of a part of the above electricity storage device. 4B is a schematic bottom view of the electricity storage device shown in FIG. 4A. FIG. 4C is an explanatory diagram illustrating a state in which the groove of the electricity storage device illustrated in FIG. 4A is cleaved. 図５Ａは、本開示の一実施形態に係る蓄電モジュールを示す概略の断面図である。図５Ｂは、図５Ａに示す蓄電モジュールの概略の底面図である。FIG. 5A is a schematic cross-sectional view showing a power storage module according to an embodiment of the present disclosure. FIG. 5B is a schematic bottom view of the power storage module shown in FIG. 5A. 図６は、変形例の蓄電モジュールが備える集電板を示す概略の平面図である。FIG. 6 is a schematic plan view showing a current collector plate included in a power storage module according to a modification.

１．概要
本実施形態に係る蓄電デバイス１は、図１及び図２Ａに示すように、巻回体２と、ケース３とを備え、集電板４を更に備える。巻回体２は、巻回軸Ｘの周囲に巻回された第１電極２１及び第２電極２２を含み、巻回軸Ｘ方向の一端に位置する第１巻回端２４において第１電極２１が露出している。ケース３は、巻回体２を収容し、底部３０を有する筒状である。集電板４は、第１巻回端２４における第１電極２１と電気的かつ機械的に接続され、かつ、第１巻回端２４と底部３０との間に位置している。 1. Outline As shown in FIGS. 1 and 2A, the power storage device 1 according to the present embodiment includes a wound body 2 and a case 3, and further includes a current collector plate 4. The wound body 2 includes a first electrode 21 and a second electrode 22 that are wound around the winding axis X, and the first electrode 21 at the first winding end 24 located at one end in the winding axis X direction. Is exposed. The case 3 has a cylindrical shape that houses the wound body 2 and has a bottom portion 30. The current collector plate 4 is electrically and mechanically connected to the first electrode 21 at the first winding end 24, and is located between the first winding end 24 and the bottom portion 30.

本実施形態の蓄電デバイス１では、第１電極２１と電気的に接続されている集電板４を介して電力の授受が行われる。第１巻回端２４で露出している第１電極２１と集電板４とを電気的に接続することにより、第１電極２１と棒状のリードタブとを電気的に接続する場合よりも、集電面積を大きくすることができる。本実施形態では、第１電極２１と集電板４との集電面積を大きくすることにより、蓄電デバイス１を低抵抗化することができる。また集電板４と接続した巻回体２をケース３内に収容しているため、ケース３と巻回体２とを直接接続する場合よりも、接続が容易である。   In the electricity storage device 1 of the present embodiment, power is transferred through the current collector plate 4 that is electrically connected to the first electrode 21. By electrically connecting the first electrode 21 exposed at the first winding end 24 and the current collector plate 4 to each other, the first electrode 21 and the rod-shaped lead tab are more electrically connected than when the first electrode 21 and the rod-shaped lead tab are electrically connected. The electric area can be increased. In the present embodiment, by increasing the current collection area between the first electrode 21 and the current collector plate 4, it is possible to reduce the resistance of the power storage device 1. Further, since the wound body 2 connected to the current collector plate 4 is accommodated in the case 3, the connection is easier than the case where the case 3 and the wound body 2 are directly connected.

２．詳細
以下、本実施形態に係る蓄電デバイス１、及び蓄電デバイス１を含む蓄電モジュールを、図１から図５を参照しながら詳細に説明する。蓄電デバイス１は、上述の通り、巻回体２と、ケース３と、集電板４とを備える。 2. Details Hereinafter, a power storage device 1 according to the present embodiment and a power storage module including the power storage device 1 will be described in detail with reference to FIGS. 1 to 5. The electricity storage device 1 includes the wound body 2, the case 3, and the current collector plate 4 as described above.

２−１．巻回体
図２Ａに示すように、巻回体２は、第１電極２１、第２電極２２、及びセパレータ２３を含む。 2-1. Winding Body As shown in FIG. 2A, the winding body 2 includes a first electrode 21, a second electrode 22, and a separator 23.

第１電極２１は、例えば、導電性のシート材である。シート材の例には、金属箔、金属多孔体、パンチングメタルが含まれる。シート材の厚みは、第１電極２１を巻回できれば、特に限定されない。このため、第１電極２１は、板状であってもよく、フィルム状であってもよい。第１電極２１の材質の例には、銅、銅合金、ニッケル、ステンレス鋼が含まれる。第１電極２１は、例えば、銅箔である。   The first electrode 21 is, for example, a conductive sheet material. Examples of the sheet material include a metal foil, a metal porous body, and a punching metal. The thickness of the sheet material is not particularly limited as long as the first electrode 21 can be wound. For this reason, the first electrode 21 may be plate-shaped or film-shaped. Examples of the material of the first electrode 21 include copper, a copper alloy, nickel, and stainless steel. The first electrode 21 is, for example, a copper foil.

本実施形態の第１電極２１は、その両面に正極材料層２１０が担持されている。正極材料層は、正極活物質を含む。正極活物質は、導電性高分子を含む繊維状又は粒塊状の内芯部と、内芯部の少なくとも一部を覆う繊維状又は粒塊状の表層部と、を有する。   The positive electrode material layer 210 is supported on both surfaces of the first electrode 21 of the present embodiment. The positive electrode material layer includes a positive electrode active material. The positive electrode active material has a fibrous or agglomerated inner core portion containing a conductive polymer, and a fibrous or agglomerated surface layer portion that covers at least a part of the inner core portion.

本実施形態では、図２Ａに示すように、第１電極２１の第１巻回端２４付近においては、第１電極２１が正極材料層２１０を担持しないことが好ましい。これにより、第１巻回端２４において、第１電極２１を露出させることができる。   In the present embodiment, as shown in FIG. 2A, it is preferable that the first electrode 21 does not carry the positive electrode material layer 210 in the vicinity of the first winding end 24 of the first electrode 21. Thereby, the first electrode 21 can be exposed at the first winding end 24.

第２電極２２は、例えば、導電性のシート材である。シート材の例には、金属箔、金属多孔体、パンチングメタルが含まれる。シート材の厚みは、第２電極２２を巻回できれば、特に限定されない。このため、第２電極２２は、板状であってもよく、フィルム状であってもよい。第２電極２２の材質の例には、アルミニウム、アルミニウム合金、ニッケル、チタンが含まれる。第２電極２２は、例えばアルミニウム箔である。   The second electrode 22 is, for example, a conductive sheet material. Examples of the sheet material include a metal foil, a metal porous body, and a punching metal. The thickness of the sheet material is not particularly limited as long as the second electrode 22 can be wound. For this reason, the second electrode 22 may be plate-shaped or film-shaped. Examples of the material of the second electrode 22 include aluminum, an aluminum alloy, nickel, and titanium. The second electrode 22 is, for example, an aluminum foil.

本実施形態の第２電極２２は、その表面に負極材料層２２０が担持されてている。負極材料層２２０は、負極活物質を含む。負極活物質は、例えば、リチウムイオンの吸蔵及び放出を伴う酸化還元反応が進行する物質である。負極活物質の具体例には、炭素材料、金属化合物、合金又はセラミックス材料が含まれる。本実施形態では、巻回体２の巻回軸Ｘ方向の他端に位置する第２巻回端２５付近において、第２電極２２が負極材料層２２０を担持しない。これにより、第２巻回端２５において、第２電極２２を露出させることができる。   The second electrode 22 of the present embodiment has a negative electrode material layer 220 supported on the surface thereof. The negative electrode material layer 220 includes a negative electrode active material. The negative electrode active material is, for example, a material that undergoes a redox reaction that accompanies occlusion and release of lithium ions. Specific examples of the negative electrode active material include a carbon material, a metal compound, an alloy, or a ceramic material. In the present embodiment, the second electrode 22 does not carry the negative electrode material layer 220 in the vicinity of the second winding end 25 located at the other end of the winding body 2 in the winding axis X direction. Thereby, the second electrode 22 can be exposed at the second winding end 25.

セパレータ２３は、例えば、セルロース繊維製の不織布、ガラス繊維製の不織布、ポリオレフィン製の微多孔膜、織布、不織布である。本実施形態のセパレータ２３は、第１セパレータ２３０及び第２セパレータ２３１を含む。第１セパレータ２３０と第２セパレータ２３１は、同じ材質であってもよいし、異なる材質であってもよい。   The separator 23 is, for example, a cellulose fiber nonwoven fabric, a glass fiber nonwoven fabric, a polyolefin microporous membrane, a woven fabric, or a nonwoven fabric. The separator 23 of this embodiment includes a first separator 230 and a second separator 231. The first separator 230 and the second separator 231 may be made of the same material or different materials.

本実施形態の巻回体２では、第１電極２１、第１セパレータ２３０、第２電極２２、及び第２セパレータ２３１がこの順に重ねられ、これらが巻回軸Ｘの周囲に巻かれている。第１電極２１、第１セパレータ２３０、第２電極２２、及び第２セパレータ２３１は、１回のみ捲かれていてもよいが、２回以上巻かれていることが好ましい。本実施形態では、第２電極２２、第１セパレータ２３０、第１電極２１、及び第２セパレータ２３１が円筒状に巻かれ、巻回体２が円筒状であるが、これに限定されない。例えば第２電極２２、第１セパレータ２３０、第１電極２１、及び第２セパレータ２３１が、巻回軸Ｘの周囲に長方形状に巻かれ、巻回体２が長方形状であってもよい。なお、巻回軸Ｘは、第１電極２１、第１セパレータ２３０、第２電極２２、及び第２セパレータ２３１を巻回する際の仮想の中心軸である。   In the wound body 2 of the present embodiment, the first electrode 21, the first separator 230, the second electrode 22, and the second separator 231 are stacked in this order, and these are wound around the winding axis X. The first electrode 21, the first separator 230, the second electrode 22, and the second separator 231 may be wound only once, but are preferably wound twice or more. In the present embodiment, the second electrode 22, the first separator 230, the first electrode 21, and the second separator 231 are wound in a cylindrical shape, and the wound body 2 is in a cylindrical shape. However, the present invention is not limited to this. For example, the second electrode 22, the first separator 230, the first electrode 21, and the second separator 231 may be wound around the winding axis X in a rectangular shape, and the wound body 2 may be rectangular. The winding axis X is a virtual central axis when the first electrode 21, the first separator 230, the second electrode 22, and the second separator 231 are wound.

本実施形態では、図２Ａに示すように、巻回体２の外周面２６に第２セパレータ２３１が設けられている。また図２Ｂに示すように、巻回軸Ｘ方向の一端に位置する第１巻回端２４では、第１電極２１が露出し、かつ、第１電極２１の層が複数形成されている。また巻回軸Ｘ方向の他端に位置する第２巻回端２５では、第２電極２２が露出している。第２電極２２は、後述の端子盤２７が電気的に接続される。。   In the present embodiment, as shown in FIG. 2A, the second separator 231 is provided on the outer peripheral surface 26 of the wound body 2. As shown in FIG. 2B, the first electrode 21 is exposed at the first winding end 24 located at one end in the winding axis X direction, and a plurality of layers of the first electrode 21 are formed. The second electrode 22 is exposed at the second winding end 25 located at the other end in the winding axis X direction. A terminal board 27 described later is electrically connected to the second electrode 22. .

２−２．集電板
集電板４は、導電性の板状の部材である。集電板４は、例えば金属製である。集電板の材質の例にはアルミニウム、銅、ニッケル、鉄、ステンレス等が含まれる。集電板４の厚みは、例えば、０．３ｍｍから０．５ｍｍの範囲内であることが好ましく、０．３５ｍｍから０．４５ｍｍの範囲内であることがより好ましい。この場合、集電板４の強度と加工性とを両立させることができる。 2-2. Current collecting plate The current collecting plate 4 is a conductive plate-like member. The current collector plate 4 is made of metal, for example. Examples of the material of the current collector plate include aluminum, copper, nickel, iron, stainless steel and the like. For example, the thickness of the current collector plate 4 is preferably in the range of 0.3 mm to 0.5 mm, and more preferably in the range of 0.35 mm to 0.45 mm. In this case, both the strength and workability of the current collector plate 4 can be achieved.

集電板４の平面視の形状は、第１巻回端２４の平面視の形状に応じて設計される。本実施形態では、第１巻回端２４の平面視の形状が円状であるため、集電板４の平面視の形状も円状であることが好ましい（図３参照）。集電板４の表面積は、第１巻回端２４の表面積と同じであるか、第１巻回端２４の表面積よりも大きいことが好ましい。この場合、第１巻回端２４の表面における第１電極２１と集電板４とを、電気的かつ機械的に接続しやすい。また後述するように、集電板４とケース３の底部３０とを溶接する場合に、集電板４と底部３０とが接続する面積を大きくすることができる。集電板４は、第１巻回端２４において露出した第１電極２１と電気的かつ機械的に接続されている。集電板４と第１電極２１との接続方法の例には、はんだ、銀ペースト等を用いたろう付け、レーザ溶接等が含まれる。本実施形態では、集電板４と第１電極２１とは、レーザ溶接によって接続することが好ましい。   The shape of the current collector plate 4 in plan view is designed according to the shape of the first winding end 24 in plan view. In the present embodiment, since the shape of the first winding end 24 in plan view is circular, the shape of the current collector plate 4 in plan view is also preferably circular (see FIG. 3). The surface area of the current collector plate 4 is preferably the same as the surface area of the first winding end 24 or larger than the surface area of the first winding end 24. In this case, it is easy to electrically and mechanically connect the first electrode 21 and the current collector plate 4 on the surface of the first winding end 24. Further, as will be described later, when the current collector plate 4 and the bottom portion 30 of the case 3 are welded, the area where the current collector plate 4 and the bottom portion 30 are connected can be increased. The current collector plate 4 is electrically and mechanically connected to the first electrode 21 exposed at the first winding end 24. Examples of a method for connecting the current collector plate 4 and the first electrode 21 include soldering, brazing using a silver paste or the like, laser welding, or the like. In the present embodiment, the current collector plate 4 and the first electrode 21 are preferably connected by laser welding.

本実施形態では、第１巻回端２４において、第１電極２１と集電板４とは第１溶接部４１で電気的かつ機械的に接続されている。集電板４と第１電極２１とをレーザ溶接によって接続している場合には、第１溶接部４１はレーザ溶接の溶接痕に対応する。図３では、第１電極２１の複数の層が点線で示されている。本実施形態では、図３に示すように、第１溶接部４１は、巻回軸Ｘ方向の一方から見て、第１電極２１の複数の層にまたがって線状に延びていることが好ましい。換言すると、第１溶接部４１は、巻回軸Ｘ方向の一方からみて、第１巻回端２４の外周部から中心部へ（或いは中心部から外周部へ）向かう線状であることが好ましい。この場合、集電板４と第１電極２１とが溶接されている箇所を多くすることができ、集電板４と第１電極２１とが接続されている面積（集電面積）が大きくなる。このため、蓄電デバイス１の抵抗値を低くすることができる。さらに集電板４と第１電極２１とを機械的に強固に接続することができる。すなわち集電板４と第１電極２１との溶接強度を向上させることができる。また第１溶接部４１が第１電極２１の複数の層にまたがる線状に伸びていることにより、第１電極２１の複数の層に沿って集電板４と第１電極２１とを溶接する場合よりも、集電板４と第１電極２１とを容易に溶接することができる。また集電板４には、複数の第１溶接部４１が設けられることが好ましい。この場合、集電板４と第１電極２１とが接続されている面積（集電面積）を大きくすることができるため、集電板４と第１電極２１と機械的により強固に接続することができ、かつ、蓄電デバイス１をより低抵抗化することができる。集電板４における第１溶接部４１の数は特に限定されないが、本実施形態の集電板４には、図３に示すように、３つの第１溶接部４１が設けられている。   In the present embodiment, at the first winding end 24, the first electrode 21 and the current collector plate 4 are electrically and mechanically connected by the first welding portion 41. When the current collector plate 4 and the first electrode 21 are connected by laser welding, the first welding portion 41 corresponds to a welding mark of laser welding. In FIG. 3, a plurality of layers of the first electrode 21 are indicated by dotted lines. In the present embodiment, as shown in FIG. 3, it is preferable that the first welding portion 41 extends linearly across a plurality of layers of the first electrode 21 when viewed from one side in the winding axis X direction. . In other words, the first welded portion 41 is preferably linear in the direction of the winding axis X from the outer peripheral portion of the first winding end 24 toward the central portion (or from the central portion to the outer peripheral portion). . In this case, the location where the current collector plate 4 and the first electrode 21 are welded can be increased, and the area (current collection area) where the current collector plate 4 and the first electrode 21 are connected increases. . For this reason, the resistance value of the electrical storage device 1 can be lowered. Furthermore, the current collector plate 4 and the first electrode 21 can be mechanically firmly connected. That is, the welding strength between the current collector plate 4 and the first electrode 21 can be improved. In addition, since the first welding portion 41 extends linearly across the plurality of layers of the first electrode 21, the current collector plate 4 and the first electrode 21 are welded along the plurality of layers of the first electrode 21. The current collector plate 4 and the first electrode 21 can be welded more easily than in the case. The current collector plate 4 is preferably provided with a plurality of first welds 41. In this case, since the area (current collection area) where the current collector plate 4 and the first electrode 21 are connected can be increased, the current collector plate 4 and the first electrode 21 are mechanically connected more firmly. And the resistance of the electricity storage device 1 can be further reduced. Although the number of the 1st welding parts 41 in the current collection board 4 is not specifically limited, As shown in FIG. 3, the three 1st welding parts 41 are provided in the current collection board 4 of this embodiment.

本実施形態の集電板４には、貫通孔４０が設けられている。蓄電デバイス１が充放電を繰り返すことによって、蓄電デバイス１内でガスが発生した場合には、このガスを貫通孔４０に導くことができる。貫通孔４０の直径は、１ｍｍから１０ｍｍの範囲内であることが好ましい。この場合、蓄電デバイス１内で発生したガスを貫通孔４０に導きやすい。貫通孔４０の位置は、特に限定されないが、平面視で集電板４の中心に設けることが好ましい。貫通孔４０は、集電板４における第１溶接部４１が設けられていない部分に設けられることが好ましい。換言すると、第１溶接部４１は、集電板４における貫通孔４０が設けられていない部分に設けることが好ましい。   The current collector plate 4 of the present embodiment is provided with a through hole 40. When the electricity storage device 1 repeats charging and discharging, and gas is generated in the electricity storage device 1, this gas can be guided to the through hole 40. The diameter of the through hole 40 is preferably in the range of 1 mm to 10 mm. In this case, the gas generated in the electricity storage device 1 can be easily guided to the through hole 40. The position of the through hole 40 is not particularly limited, but is preferably provided at the center of the current collector plate 4 in plan view. The through hole 40 is preferably provided in a portion of the current collector plate 4 where the first welded portion 41 is not provided. In other words, the first welded portion 41 is preferably provided in a portion of the current collector plate 4 where the through hole 40 is not provided.

本実施形態の集電板４には、外周部に切欠き４２が設けられている。後述のケース３内に巻回体２及び集電板４を挿入する際、切欠き４２によって、ケース３内での集電板４の向きを把握することができる。これにより、ケース３内で第１溶接部４１がどの向きにあるかを容易に把握することができる。切欠き４２の形状は、特に限定されず、図３に示すように半円状であってもよく、三角形状であってもよく、四角形状であってもよく、線状であってもよい。   The current collector plate 4 of the present embodiment is provided with a notch 42 on the outer periphery. When inserting the wound body 2 and the current collector plate 4 into the case 3 to be described later, the orientation of the current collector plate 4 in the case 3 can be grasped by the notch 42. Thereby, it can be easily grasped in which direction the first welded portion 41 is in the case 3. The shape of the notch 42 is not particularly limited, and may be a semicircular shape, a triangular shape, a quadrangular shape, or a linear shape as shown in FIG. .

２−３．ケース
図４Ａに示すように、ケース３は有底の筒状である。具体的には、ケース３は、底部３０と、底部３０から巻回軸Ｘ方向に沿って立ち上がる側壁部３１とを備える。底部３０の厚みは、特に限定されない。底部３０厚みは、一定であってもよく、部分的に異なっていてもよい。ケース３の材質の例にはアルミニウム、ニッケル、鉄、ステンレス等が含まれる。ケース３の材質は、導電性及び加工性を確保するため、アルミニウムであることが好ましい。ケース３の形状及び大きさは、巻回体２及び集電板４を収容可能であれば特に限定されない。巻回体２及び集電板４がケース３内に収容された状態では、集電板４が、巻回体２の第１巻回端２４と底部３０との間に位置している。 2-3. Case As shown in FIG. 4A, the case 3 has a bottomed cylindrical shape. Specifically, the case 3 includes a bottom 30 and a side wall 31 rising from the bottom 30 along the winding axis X direction. The thickness of the bottom 30 is not particularly limited. The thickness of the bottom 30 may be constant or may be partially different. Examples of the material of the case 3 include aluminum, nickel, iron, stainless steel and the like. The material of the case 3 is preferably aluminum in order to ensure conductivity and workability. The shape and size of the case 3 are not particularly limited as long as the wound body 2 and the current collector plate 4 can be accommodated. In a state where the wound body 2 and the current collector plate 4 are accommodated in the case 3, the current collector plate 4 is located between the first winding end 24 and the bottom 30 of the wound body 2.

本実施形態では、集電板４と底部３０とが電気的に接続されていることが好ましい。集電板４は巻回体２の第１電極２１と電気的に接続されているため、集電板４と底部３０とを電気的に接続することにより、集電板４を介して、底部３０と第１電極２１とを電気的に接続することができる。集電板４と底部３０との電気的な接続は、リード線、銅線、編組線等の線材を使用してもよく、はんだ、銀ぺースト等を用いたろう付け、レーザ溶接等の溶接によって行ってもよい。   In the present embodiment, it is preferable that the current collector plate 4 and the bottom 30 are electrically connected. Since the current collector plate 4 is electrically connected to the first electrode 21 of the wound body 2, the current collector plate 4 and the bottom portion 30 are electrically connected to each other through the current collector plate 4. 30 and the first electrode 21 can be electrically connected. The electrical connection between the current collector plate 4 and the bottom portion 30 may use a wire such as a lead wire, a copper wire, a braided wire, etc. You may go.

本実施形態では、集電板４と底部３０とが機械的に接続されていることが好ましい。集電板４は巻回体２の第１電極２１と機械的に接続されているため、集電板４と底部３０とを機械的に接続することにより、集電板４を介して、底部３０と第１電極２１とを機械的に接続することができる。すなわち、巻回体２及び集電板４がケース３内に収容された状態で、巻回体２及び集電板４をケース３内に固定することができる。集電板４と底部３０との機械的な接続は、接着剤、ねじ止め、かしめ等で行われてもよく、はんだ、銀ペースト等を用いたろう付け、レーザ溶接等の溶接によって行われてもよい。   In the present embodiment, it is preferable that the current collector plate 4 and the bottom 30 are mechanically connected. Since the current collector plate 4 is mechanically connected to the first electrode 21 of the wound body 2, the bottom portion of the current collector plate 4 is mechanically connected to the bottom portion 30 via the current collector plate 4. 30 and the first electrode 21 can be mechanically connected. That is, the wound body 2 and the current collector plate 4 can be fixed in the case 3 while the wound body 2 and the current collector plate 4 are accommodated in the case 3. The mechanical connection between the current collector plate 4 and the bottom 30 may be performed by an adhesive, screwing, caulking, or the like, or may be performed by soldering, brazing using a silver paste, laser welding or the like. Good.

本実施形態では特に、集電板４と底部３０とが電気的かつ機械的に接続されていることが好ましい。具体的には、図４Ｂに示すように、集電板４と底部３０とは、第１溶接部４１とは別の第２溶接部３４で電気的かつ機械的に接続することが好ましい。集電板４と底部３０とを電気的かつ機械的に接続する方法としては、はんだ、銀ぺースト等を用いたろう付け、レーザ溶接等の溶接が特に好ましい。この場合、集電板４と底部３０との電気的な接続と、機械的な接続を同時に行うことができる。集電板４と底部３０とをレーザ溶接によって接続している場合には、第２溶接部３４はレーザー溶接の溶接痕に対応する。図４Ｂでは、第１電極２１、集電板４、及び第１溶接部４１が点線で示されている。本実施形態では、第２溶接部３４は、巻回軸Ｘ方向の一方から見て、第１溶接部４１と重ならない位置にあることが好ましい。第２溶接部３４が第１溶接部４１と重なる位置にあると、集電板４と底部３０との接続強度が低下することがある。これに対して、第２溶接部３４が第１溶接部４１と重ならない位置にあることにより、集電板４と底部３０とを強固に接続することができる。例えば、集電板４と底部３０とをレーザ溶接する際には、集電板４に設けられた切欠き４２の位置に基づいて、巻回軸Ｘ方向の一方から見た第１溶接部４１の位置を推定し、第１溶接部４１と重ならないように集電板４と底部３０とを溶接する。また底部３０には、複数の第２溶接部３４が設けられることが好ましい。この場合、底部３０と集電板４とが接続されている面積が大きくなるため、底部３０と集電板４とをより強固に接続することができる。   In the present embodiment, it is particularly preferable that the current collector plate 4 and the bottom 30 are electrically and mechanically connected. Specifically, as shown in FIG. 4B, it is preferable that the current collector plate 4 and the bottom portion 30 are electrically and mechanically connected by a second welded portion 34 different from the first welded portion 41. As a method of electrically and mechanically connecting the current collector plate 4 and the bottom portion 30, welding such as soldering, brazing using a silver paste or the like, laser welding or the like is particularly preferable. In this case, electrical connection between the current collector plate 4 and the bottom 30 and mechanical connection can be performed simultaneously. When the current collector plate 4 and the bottom portion 30 are connected by laser welding, the second welding portion 34 corresponds to a welding mark of laser welding. In FIG. 4B, the 1st electrode 21, the current collecting plate 4, and the 1st welding part 41 are shown with the dotted line. In this embodiment, it is preferable that the 2nd welding part 34 exists in the position which does not overlap with the 1st welding part 41 seeing from one side of the winding axis X direction. If the second weld 34 is in a position where it overlaps the first weld 41, the connection strength between the current collector plate 4 and the bottom 30 may be reduced. On the other hand, the current collector plate 4 and the bottom 30 can be firmly connected by the second welded portion 34 being in a position where it does not overlap the first welded portion 41. For example, when laser collecting the current collector plate 4 and the bottom portion 30, the first welded portion 41 viewed from one side in the winding axis X direction based on the position of the notch 42 provided in the current collector plate 4. The current collector plate 4 and the bottom portion 30 are welded so as not to overlap the first welded portion 41. Moreover, it is preferable that the bottom part 30 is provided with a plurality of second welds 34. In this case, since the area where the bottom 30 and the current collector plate 4 are connected is increased, the bottom 30 and the current collector 4 can be more firmly connected.

第２溶接部３４の形状は、巻回軸Ｘ方向から見て、第１溶接部４１と重なっていなければ、任意の形状であってよい。特に本実施形態では、第２溶接部３４が、巻回軸Ｘ方向の一方から見て、巻回体２の巻き方向に沿って延びる線状であることが好ましい。換言すると、第２溶接部３４は、第１電極２１の巻き方向に沿って延びる線状であることが好ましい。第１溶接部４１は、第１電極２１の複数の層にまたがる線状であるため、第２溶接部３４が巻回体２の巻き方向に沿って延びる線状であることにより、第１溶接部４１を避けつつ、集電板４と底部３０との溶接面積を確保することができる。また本実施形態では、第２溶接部３４の合計の面積は、第１溶接部４１の合計の面積よりも小さいことが好ましい。すなわち、集電板４と底部３０との溶接面積が、第１電極２１と集電板４との溶接面積よりも、小さいことが好ましい。集電板４が板状の部材であるのに対して、第１電極２１は厚みが薄いシート状の部材である。このため、集電板４と底部３０と間の単位溶接面積あたりの接続強度の方が、第１電極２１と集電板４との間よりも、大きくなる傾向がある。よって、第２溶接部３４の合計の面積を第１溶接部４１の合計の面積よりも小さして、第１電極２１と集電板４との溶接面積を優先的に大きくすることで、第１電極２１と集電板４との接続強度を確保しやすくできる。 本実施形態の底部３０は、開裂可能な溝３５０を有する開放部３５を含むことが好ましい。すなわち開放部３５は、底部３０における溝３５０を含む領域である。蓄電デバイス１が充放電を繰り返すことで蓄電デバイス１内でガスで発生した場合に、図４Ｃに示すように溝３５０が開裂することで、このガスを放出させることができる。図４Ｃにおいては、ガスの流れを矢印で示している。第１巻回端２４で露出した第１電極２１と底部３０とを直接接続する場合には、第１電極２１と底部３０との溶接部の領域を確保する必要があるため、底部３０に開放部３５を設けることは困難である。これに対して本実施形態の蓄電デバイス１では、第１巻回端２４で露出した第１電極２１と集電板４とを接続し、かつ集電板４と底部３０とを接続しているため、底部３０に開放部３５を設けやすい。   The shape of the second welded portion 34 may be an arbitrary shape as long as it does not overlap the first welded portion 41 when viewed from the winding axis X direction. In particular, in the present embodiment, it is preferable that the second welding portion 34 has a linear shape extending along the winding direction of the wound body 2 when viewed from one side in the winding axis X direction. In other words, the second welded portion 34 is preferably a linear shape extending along the winding direction of the first electrode 21. Since the 1st welding part 41 is linear extending over the several layer of the 1st electrode 21, when the 2nd welding part 34 is linear extending along the winding direction of the winding body 2, it is 1st welding. While avoiding the portion 41, a welding area between the current collector plate 4 and the bottom portion 30 can be secured. In the present embodiment, the total area of the second welds 34 is preferably smaller than the total area of the first welds 41. That is, the welding area between the current collector plate 4 and the bottom 30 is preferably smaller than the welding area between the first electrode 21 and the current collector plate 4. The current collecting plate 4 is a plate-like member, whereas the first electrode 21 is a thin sheet-like member. For this reason, the connection strength per unit weld area between the current collector plate 4 and the bottom portion 30 tends to be larger than that between the first electrode 21 and the current collector plate 4. Therefore, the first welded area between the first electrode 21 and the current collector plate 4 is preferentially increased by reducing the total area of the second welds 34 to be smaller than the total area of the first welds 41. The connection strength between the electrode 21 and the current collector plate 4 can be easily secured. The bottom 30 of this embodiment preferably includes an opening 35 having a cleavable groove 350. That is, the open portion 35 is a region including the groove 350 in the bottom portion 30. When the electricity storage device 1 is repeatedly charged and discharged to generate gas in the electricity storage device 1, the groove 350 is cleaved as shown in FIG. 4C so that the gas can be released. In FIG. 4C, the gas flow is indicated by arrows. When the first electrode 21 exposed at the first winding end 24 and the bottom portion 30 are directly connected, it is necessary to secure a region of the welded portion between the first electrode 21 and the bottom portion 30, so that the bottom portion 30 is opened. It is difficult to provide the portion 35. On the other hand, in the electrical storage device 1 of the present embodiment, the first electrode 21 exposed at the first winding end 24 and the current collector plate 4 are connected, and the current collector plate 4 and the bottom portion 30 are connected. Therefore, it is easy to provide the opening portion 35 in the bottom portion 30.

本実施形態では、底部３０における開放部３５の厚みは、底部３０における開放部３５以外の部分の厚みよりも小さいことが好ましい。換言すると、底部３０における開放部３５以外の部分の厚みは、底部３０における開放部３５の厚みよりも大きいことが好ましい。この場合、開放部３５が有する溝３５０を開裂し易くすることができ、蓄電デバイス１内でガスが発生した場合に、このガスをより放出させやすくできる。また蓄電デバイス１内でガスが発生した場合に、ガスの圧力によって、底部３０における開放部３５以外の部分が変形することを抑制することができる。   In the present embodiment, the thickness of the open portion 35 in the bottom portion 30 is preferably smaller than the thickness of the portion other than the open portion 35 in the bottom portion 30. In other words, the thickness of the portion other than the opening portion 35 in the bottom portion 30 is preferably larger than the thickness of the opening portion 35 in the bottom portion 30. In this case, the groove 350 included in the opening portion 35 can be easily cleaved, and when gas is generated in the electricity storage device 1, this gas can be easily released. Further, when gas is generated in the electricity storage device 1, it is possible to suppress deformation of the portion other than the opening portion 35 in the bottom portion 30 due to the pressure of the gas.

また本実施形態では、底部３０において、第２溶接部３４は開放部３５以外の部分に位置していることが好ましい。開放部３５に第２溶接部３４が位置していると、蓄電デバイス１内で発生したガスの圧力で溝３５０が開裂した場合に、集電板４と底部３０との接続が外れることがある。これに対して、第２溶接部３４が開放部３５以外の部分に位置していることにより、ガスの圧力で溝３５０が開裂した場合に、第２溶接部３４における集電板４と底部３０との接続が外れることを抑制することができる。   In the present embodiment, it is preferable that the second welded portion 34 is located at a portion other than the open portion 35 in the bottom portion 30. When the second welded portion 34 is located in the open portion 35, the connection between the current collector plate 4 and the bottom portion 30 may be disconnected when the groove 350 is cleaved by the pressure of gas generated in the electricity storage device 1. . On the other hand, when the second welded portion 34 is located in a portion other than the open portion 35, the current collector plate 4 and the bottom portion 30 in the second welded portion 34 when the groove 350 is cleaved by the gas pressure. Can be prevented from being disconnected.

本実施形態では、底部３０における開放部３５の厚みが、底部３０における開放部３５以外の部分の厚みよりも小さく、かつ、底部３０における開放部３５以外の部分に第２溶接部３４が位置していることが特に好ましい。この場合、第２溶接部３４における集電板４と底部３０との接続が外れることを特に抑制することができる。   In the present embodiment, the thickness of the open portion 35 in the bottom portion 30 is smaller than the thickness of the portion other than the open portion 35 in the bottom portion 30, and the second welded portion 34 is located in a portion other than the open portion 35 in the bottom portion 30. It is particularly preferable. In this case, it is possible to particularly suppress the disconnection between the current collector plate 4 and the bottom portion 30 in the second welded portion 34.

また本実施形態では、開放部３５が、ケース３の内側に向かって凹んでいることが好ましい。換言すると、底部３０に設けられた凹部内に開放部３５が設けられることが好ましい。この場合、底部３０に設けられた凹部内で溝３５０が開裂することができる（図５Ｃ参照）。すなわち、底部３０に設けられた凹部によって、溝３５０が開裂するための空間を確保することができる。   In the present embodiment, it is preferable that the opening 35 is recessed toward the inside of the case 3. In other words, it is preferable that the open portion 35 is provided in the recess provided in the bottom portion 30. In this case, the groove 350 can be cleaved in the recess provided in the bottom 30 (see FIG. 5C). That is, a space for the groove 350 to be cleaved can be secured by the recess provided in the bottom 30.

また本実施形態では、開放部３５の位置と貫通孔４０の位置とは、巻回軸Ｘ方向の一方から見て、重なっていることが好ましい。この場合、蓄電デバイス１内で発生して貫通孔４０に導かれたガスを、開放部３５から放出させやすくすることができる（図４Ｃ参照）。このため、蓄電デバイス１の充放電の繰り返しで発生したガスを、開放部３５から効率よく放出できる。   In the present embodiment, it is preferable that the position of the opening portion 35 and the position of the through hole 40 overlap with each other when viewed from one side in the winding axis X direction. In this case, the gas generated in the electricity storage device 1 and guided to the through hole 40 can be easily released from the opening 35 (see FIG. 4C). For this reason, the gas generated by repeated charging / discharging of the electricity storage device 1 can be efficiently released from the open portion 35.

また本実施形態では、溝３５０が開裂しやすいように、開放部３５は、交差した複数の溝３５０を有することが好ましい。換言すると、開放部３５が複数の溝３５０を有し、かつ、開放部３５が複数の溝３５０が交わる交点があることが好ましい。本実施形態では、複数の溝３５０が「＋」状に交差しているが（図４Ｂ参照）、複数の溝３５０の形状は特に限定されない。また複数の溝３５０の交点と、貫通孔４０の位置とは、巻回軸Ｘ方向の一方から見て、重なっていることが好ましい。この場合、蓄電デバイス１内で発生して貫通孔４０に導かれたガスによって、溝３５０を開裂しやすくできる（図４Ｃ参照）。このため、蓄電デバイス１の充放電の繰り返しで発生したガスを、開放部３５から特に効率よく放出できる。   Moreover, in this embodiment, it is preferable that the open part 35 has a plurality of intersecting grooves 350 so that the grooves 350 are easily cleaved. In other words, it is preferable that the opening portion 35 has a plurality of grooves 350 and the opening portion 35 has an intersection where the plurality of grooves 350 intersect. In the present embodiment, the plurality of grooves 350 intersect in a “+” shape (see FIG. 4B), but the shape of the plurality of grooves 350 is not particularly limited. In addition, it is preferable that the intersection of the plurality of grooves 350 and the position of the through hole 40 overlap each other when viewed from one side in the winding axis X direction. In this case, the groove 350 can be easily cleaved by the gas generated in the electricity storage device 1 and guided to the through hole 40 (see FIG. 4C). For this reason, the gas generated by the repeated charging / discharging of the electricity storage device 1 can be released particularly efficiently from the open portion 35.

本実施形態のケース３は、底部３０と対向する開口部３２を備える（図１参照）。開口部３２の近傍は、内側に向かって絞り加工されている。また本実施形態のケース３では、開口部３２を塞ぐ封口体３３が設けられている。開口部３２の縁は、封口体３３をかしめるようにカール加工されている。封口体３３は、例えばゴム成分を含む弾性材料製である。   The case 3 of the present embodiment includes an opening 32 that faces the bottom 30 (see FIG. 1). The vicinity of the opening 32 is drawn toward the inside. In the case 3 of the present embodiment, a sealing body 33 that closes the opening 32 is provided. The edge of the opening 32 is curled so as to caulk the sealing body 33. The sealing body 33 is made of an elastic material containing a rubber component, for example.

図１Ａに示すように、封口体３３と巻回体２との間には、端子板２７が設けられている。端子板２７は板状の部材である。端子板２７の材質は、導電性の金属であり、例えばアルミニウム、銅、ニッケル、鉄、ステンレスである。端子板２７は、巻回体２側の面に設けられた接続部２７１と、封口体３３側の面に設けられた外部端子部２７０とを含む。本実施形態では、巻回体２の第２巻回端２５において第２電極２２が露出しており、この第２電極２２と接続部２７１とが電気的に接続されている。これにより、第２電極２２と端子板２７とを電気的に接続することができる。また外部端子部２７１は、封口体３３を貫通し、かつ、その先端が外部に露出している。すなわち外部端子部２７１によって、第２電極２２と接続された端子板２７を、外部に露出させることができる。   As shown in FIG. 1A, a terminal plate 27 is provided between the sealing body 33 and the wound body 2. The terminal board 27 is a plate-like member. The material of the terminal plate 27 is a conductive metal, such as aluminum, copper, nickel, iron, or stainless steel. The terminal plate 27 includes a connection portion 271 provided on the surface on the wound body 2 side and an external terminal portion 270 provided on the surface on the sealing body 33 side. In the present embodiment, the second electrode 22 is exposed at the second winding end 25 of the wound body 2, and the second electrode 22 and the connection portion 271 are electrically connected. Thereby, the 2nd electrode 22 and the terminal board 27 can be electrically connected. Further, the external terminal portion 271 penetrates the sealing body 33 and its tip is exposed to the outside. That is, the terminal plate 27 connected to the second electrode 22 can be exposed to the outside by the external terminal portion 271.

２−４．蓄電デバイス
本実施形態の蓄電デバイス１は、例えば、以下のようにして製造することができる。 2-4. Electric storage device The electric storage device 1 of this embodiment can be manufactured as follows, for example.

まず、巻回体２の第１巻回端２４において露出した第１電極２１と、集電板４とを、レーザ溶接によって、電気的かつ機械的に接続する。次に、ケース３の開口部３２からケース３内に、巻回体２及び集電板４を挿入する。次に、ケース３の底部３０と集電板４とをレーザ溶接によって、電気的かつ機械的に接続する。次に、ケース３内に非水電解液を供給する。この非水電解液は、リチウムイオンを伝導性を有し、例えば、リチウム塩と、リチウム塩を溶解させる非水溶媒を含む。次に、開口部３２を封口体３３で塞ぐ。これにより、本実施形態の蓄電デバイス１が製造され得る。   First, the first electrode 21 exposed at the first winding end 24 of the wound body 2 and the current collector plate 4 are electrically and mechanically connected by laser welding. Next, the wound body 2 and the current collector plate 4 are inserted into the case 3 from the opening 32 of the case 3. Next, the bottom 30 of the case 3 and the current collector plate 4 are electrically and mechanically connected by laser welding. Next, a non-aqueous electrolyte is supplied into the case 3. This non-aqueous electrolyte has lithium ion conductivity, and includes, for example, a lithium salt and a non-aqueous solvent that dissolves the lithium salt. Next, the opening 32 is closed with the sealing body 33. Thereby, the electrical storage device 1 of this embodiment can be manufactured.

２−５．蓄電モジュール
本実施形態の蓄電モジュール１００は、図５Ａ及び図５Ｂに示すように、上記蓄電デバイス１を複数含んでいる。蓄電モジュール１００には、３つの蓄電デバイス１が含まれている。３つの蓄電モジュール１００には、第１蓄電デバイス１０１、第２蓄電デバイス１０２、第３蓄電デバイス１０３が含まれる。なお、蓄電モジュール１００に含まれる蓄電デバイス１の数は、２つ以上であれば特に限定されない。複数の蓄電デバイス１は、導電性を有する導電部材１１０によって、電気的かつ機械的に接続されている。導電部材１１０は、導電性を有していれば特に限定されないが、例えば、金属製である。導電部材１１０の材質の例には、銅、真鍮、アルミニウムが含まれる。導電部材１１０は、例えばバスバー（bus bar）である。 2-5. Power Storage Module The power storage module 100 of the present embodiment includes a plurality of the power storage devices 1 as shown in FIGS. 5A and 5B. The power storage module 100 includes three power storage devices 1. The three power storage modules 100 include a first power storage device 101, a second power storage device 102, and a third power storage device 103. The number of power storage devices 1 included in the power storage module 100 is not particularly limited as long as it is two or more. The plurality of power storage devices 1 are electrically and mechanically connected by a conductive member 110 having conductivity. The conductive member 110 is not particularly limited as long as it has conductivity. For example, the conductive member 110 is made of metal. Examples of the material of the conductive member 110 include copper, brass, and aluminum. The conductive member 110 is, for example, a bus bar.

本実施形態の蓄電モジュール１００では、第１蓄電デバイス１０１の底部３０と、第２蓄電デバイス１０２の底部３０とが、導電部材１１０によって、電気的かつ機械的に接続されている。また第２蓄電デバイス１０２の底部３０と、第３蓄電デバイス１０３の底部３０とが、導電部材１１０によって、電気的かつ機械的に接続されている。底部３０は、蓄電デバイス１が備える巻回体２の第１電極２１と電気的に接続されていることから、蓄電モジュール１００では、各蓄電デバイス１の第１電極２１同士を接続している。また図示していないが、各蓄電デバイス１のリード線２７０同士を接続することが好ましい。リード線２７０は蓄電デバイス１が備える巻回体２の第２電極２２と電気的に接続されている。このため、各蓄電デバイス１のリード線２７０同士を接続することにより、各蓄電デバイス１の第２電極２２同士を接続することができる。この場合、蓄電モジュール１００では、第１蓄電デバイス１０１、第２蓄電デバイス１０２、及び第３蓄電デバイス１０３が、並列に接続することができる。   In the power storage module 100 of this embodiment, the bottom 30 of the first power storage device 101 and the bottom 30 of the second power storage device 102 are electrically and mechanically connected by the conductive member 110. Further, the bottom 30 of the second power storage device 102 and the bottom 30 of the third power storage device 103 are electrically and mechanically connected by the conductive member 110. Since the bottom 30 is electrically connected to the first electrode 21 of the wound body 2 included in the power storage device 1, in the power storage module 100, the first electrodes 21 of the power storage devices 1 are connected to each other. Although not shown, it is preferable to connect the lead wires 270 of the electricity storage devices 1 to each other. The lead wire 270 is electrically connected to the second electrode 22 of the wound body 2 included in the electricity storage device 1. For this reason, the 2nd electrodes 22 of each electrical storage device 1 can be connected by connecting the lead wires 270 of each electrical storage device 1 to each other. In this case, in the power storage module 100, the first power storage device 101, the second power storage device 102, and the third power storage device 103 can be connected in parallel.

底部３０と導電部材１１０との接続方法の例には、はんだ、銀ペースト等を用いたろう付け、レーザ溶接等が含まれる。本実施形態では、底部３０と導電部材１１０とを、レーザ溶接によって接続することが好ましい。例えば、一方の蓄電デバイス１の底部３０と導電部材１１０とをレーザ溶接し、さらに他方の蓄電デバイス１の底部３０と導電部材１１０とをレーザ溶接することにより、二つの蓄電デバイス１を電気的かつ機械的に接続することができる。本実施形態では、底部３０における導電部材１１０との溶接箇所（第３溶接部１１１）が、巻回軸Ｘ方向の一方からみて、第１溶接部４１と重ならない位置にあることが好ましい。また第３溶接部１１１は、巻回軸Ｘ方向の一方からみて、第２溶接部３４と重ならない位置にあることが好ましい。第３溶接部１１１と第１溶接部４１と重なる位置にある場合、及び第３溶接部１１１と第２溶接部３４と重なる位置にある場合には、、底部３０と導電部材１１０との接続強度が低下することがある、これに対して、第３溶接部１１１と第１溶接部４１とが重ならない位置にあり、また第３溶接部１１１と第２溶接部３４と重ならない位置にあることにより、底部３０と導電部材１１０との接続強度を十分に確保することができる。また第３溶接部１１１は、底部３０における開放部３５以外の部分にあることが好ましい。本実施形態では、底部３０における開放部３５以外の部分の厚みは、開放部３５の厚みよりも大きいため、第３溶接部１１１が底部３０における開放部３５以外の部分にあることにより、底部３０と導電部材１１０との接続強度を向上させることができる。また本実施形態では、蓄電デバイス１の底部３０に導電部材１１０を設けているため、導電部材１１０の厚みによっても、開放部３５が備える溝３５０が開裂するための空間を確保することができる。   Examples of the connection method between the bottom 30 and the conductive member 110 include soldering, brazing using a silver paste or the like, laser welding, or the like. In the present embodiment, it is preferable to connect the bottom 30 and the conductive member 110 by laser welding. For example, the bottom 30 of one power storage device 1 and the conductive member 110 are laser-welded, and the bottom 30 of the other power storage device 1 and the conductive member 110 are laser-welded, so that the two power storage devices 1 can be electrically and Can be mechanically connected. In the present embodiment, it is preferable that the welded portion (third welded portion 111) with the conductive member 110 in the bottom portion 30 is in a position that does not overlap the first welded portion 41 when viewed from one side in the winding axis X direction. Moreover, it is preferable that the 3rd welding part 111 exists in the position which does not overlap with the 2nd welding part 34 seeing from one side of the winding axis X direction. When it exists in the position which overlaps with the 3rd weld part 111 and the 1st weld part 41, and when it exists in the position which overlaps with the 3rd weld part 111 and the 2nd weld part 34, the connection strength of the bottom part 30 and the electrically-conductive member 110 In contrast, the third welded portion 111 and the first welded portion 41 are not overlapped with each other, and the third welded portion 111 and the second welded portion 34 are not overlapped with each other. As a result, the connection strength between the bottom 30 and the conductive member 110 can be sufficiently secured. Moreover, it is preferable that the 3rd welding part 111 exists in parts other than the open part 35 in the bottom part 30. FIG. In the present embodiment, since the thickness of the portion other than the open portion 35 in the bottom portion 30 is larger than the thickness of the open portion 35, the third welded portion 111 is in a portion other than the open portion 35 in the bottom portion 30. The connection strength between the conductive member 110 and the conductive member 110 can be improved. In the present embodiment, since the conductive member 110 is provided on the bottom 30 of the electricity storage device 1, a space for the groove 350 included in the open portion 35 to be opened can be secured depending on the thickness of the conductive member 110.

３．変形例
上述の実施形態に係る蓄電デバイス１及び蓄電モジュール１００の構成は、あくまで一例である。蓄電デバイス１及び蓄電モジュール１００の構成は、上述の実施形態の構成に限定されない。 3. Modifications The configurations of the power storage device 1 and the power storage module 100 according to the above-described embodiment are merely examples. The configurations of the power storage device 1 and the power storage module 100 are not limited to the configurations of the above-described embodiments.

例えば、蓄電デバイス１は、リチウムイオン電池等の二次電池であってもよく、リチウムイオンキャパシタ、電気二重層キャパシタ等の電気化学デバイスであってもよく、その他の電気化学デバイスであってもよい。   For example, the electricity storage device 1 may be a secondary battery such as a lithium ion battery, may be an electrochemical device such as a lithium ion capacitor or an electric double layer capacitor, or may be another electrochemical device. .

上述の実施系形態に係る蓄電デバイス１が備える巻回体２では、図２Ａに示すように、第１電極２１、セパレータ２３、第２電極２２、及びセパレータ２３がこの順に重ねられているが、これに限定されない。例えば、巻回体２において、第２電極２２、セパレータ２３、第１電極２１、セパレータ２３がこの順に重ねられていてもよい。   In the wound body 2 included in the electricity storage device 1 according to the above-described embodiment, as illustrated in FIG. 2A, the first electrode 21, the separator 23, the second electrode 22, and the separator 23 are stacked in this order. It is not limited to this. For example, in the wound body 2, the second electrode 22, the separator 23, the first electrode 21, and the separator 23 may be stacked in this order.

上述の実施形態に係る蓄電デバイス１では、図３に示すように、第１巻回端２４で露出した第１電極２１と集電板４とが３つの第１溶接部４１で接続されていたが、これに限定されない。例えば、図６に示す変形例の蓄電デバイス１のように、第１巻回端２４で露出した第１電極２１と集電板４とが６つの第１溶接部４１で接続されていてもよい。これら６つの第１溶接部４１は、それぞれ、巻回軸Ｘ方向の一方からみて、第１電極２１の複数の層にまたがって線状に伸びている。   In the electricity storage device 1 according to the above-described embodiment, as illustrated in FIG. 3, the first electrode 21 exposed at the first winding end 24 and the current collector plate 4 are connected by the three first welds 41. However, it is not limited to this. For example, like the power storage device 1 of the modification shown in FIG. 6, the first electrode 21 exposed at the first winding end 24 and the current collector plate 4 may be connected by six first welds 41. . Each of these six first welds 41 extends linearly across a plurality of layers of the first electrode 21 when viewed from one side in the winding axis X direction.

上述の実施形態に係る蓄電デバイス１では、図４Ｂに示すように、底部３０は、「＋」状に交差する複数の溝３５０を備えているが、これに限定されず、「＋」状以外の形状に交差する複数の溝３５０を備えていてもよい。。   In the electricity storage device 1 according to the above-described embodiment, as illustrated in FIG. 4B, the bottom portion 30 includes a plurality of grooves 350 that intersect in a “+” shape, but is not limited thereto, and other than “+” shape There may be a plurality of grooves 350 that intersect the shape. .

上述の実施形態に係る蓄電デバイス１では、図４Ｂに示すように、底部３０が開放部３５を含んでいるが、これに限定されない。例えば、底部３０が開放部３５を含んでいなくてもよい。この場合、底部３０が厚みの大きい部分と厚みが小さい部分とを含まず、底部３０の厚みが一定であってもよい。また底部３０がケース３の内側に凹んだ部分を有さず、底部３０が平坦であってもよい。また集電板４が貫通孔４０を有していなくてもよい。また底部３０と集電板４との第２溶接部３４が、巻回軸Ｘ方向の一方から見て、巻回体２の巻き方向に沿って延びる線状でなくてもよい。例えば、第２溶接部３４が、巻回軸Ｘ方向の一方から見て、第１電極２１の複数の層にまたがって線状に伸びていてもよい。   In the electricity storage device 1 according to the above-described embodiment, as illustrated in FIG. 4B, the bottom portion 30 includes the open portion 35, but is not limited thereto. For example, the bottom portion 30 may not include the opening portion 35. In this case, the bottom 30 may not include a portion having a large thickness and a portion having a small thickness, and the thickness of the bottom 30 may be constant. Moreover, the bottom part 30 may not have a recessed part inside the case 3, and the bottom part 30 may be flat. Further, the current collector plate 4 may not have the through holes 40. Further, the second welded portion 34 between the bottom portion 30 and the current collector plate 4 does not have to be linear extending along the winding direction of the wound body 2 when viewed from one side in the winding axis X direction. For example, the second welding portion 34 may extend linearly across a plurality of layers of the first electrode 21 when viewed from one side in the winding axis X direction.

４．本開示の概要
第１の態様に係る蓄電デバイス（１）は、巻回体（２）と、ケース（３）とを備え、集電板（４）を更に備える。巻回体（２）は、巻回軸（Ｘ）の周囲に巻回された第１電極（２１）及び第２電極（２２）を含み、巻回軸（Ｘ）方向の一端に位置する第１巻回端（２４）において第１電極（２１）が露出している。ケース（３）は、巻回体（２）を収容し、底部（３０）を有する筒状である。集電板（４）は、第１巻回端（２４）における第１電極（２１）と電気的かつ機械的に接続され、かつ、第１巻回端（２４）と底部（３０）との間に位置する。 4). Outline of the Present Disclosure An electric storage device (1) according to a first aspect includes a wound body (2) and a case (3), and further includes a current collector plate (4). The wound body (2) includes a first electrode (21) and a second electrode (22) wound around the winding shaft (X), and is positioned at one end in the winding shaft (X) direction. The first electrode (21) is exposed at the first winding end (24). The case (3) has a cylindrical shape that houses the wound body (2) and has a bottom (30). The current collector plate (4) is electrically and mechanically connected to the first electrode (21) at the first winding end (24), and between the first winding end (24) and the bottom portion (30). Located between.

この構成によれば、第１巻回端（２４）で露出している第１電極（２１）と集電板（４）とを電気的に接続しているため、集電面積を大きくすることができる。第１電極（２１）と集電板（４）との集電面積を大きくすることにより、蓄電デバイス（１）を低抵抗化することができる。また集電板（４）と接続した巻回体（２）をケース（３）内に収容しているため、ケース（３）と巻回体（２）とを直接接続する場合よりも、容易に接続することができる。   According to this configuration, since the first electrode (21) exposed at the first winding end (24) and the current collector plate (4) are electrically connected, the current collection area is increased. Can do. By increasing the current collection area of the first electrode (21) and the current collector plate (4), the electricity storage device (1) can be reduced in resistance. Further, since the wound body (2) connected to the current collector plate (4) is accommodated in the case (3), it is easier than the case where the case (3) and the wound body (2) are directly connected. Can be connected to.

第２の態様に係る蓄電デバイス（１）は、第１の態様において、集電板（４）と底部（３０）とが電気的に接続されている。   In the electricity storage device (1) according to the second aspect, in the first aspect, the current collector plate (4) and the bottom (30) are electrically connected.

この構成によれば、集電板（４）は巻回体（２）の第１電極（２１）と電気的に接続されているため、集電板（４）を介して、底部（３０）と第１電極（２１）とを電気的に接続することができる。   According to this configuration, since the current collector plate (4) is electrically connected to the first electrode (21) of the wound body (2), the bottom portion (30) is interposed via the current collector plate (4). And the first electrode (21) can be electrically connected.

第３の態様に係る蓄電デバイス（１）は、第１又は第２の態様において、集電板（４）と底部（３０）とが機械的に接続されている。   In the electricity storage device (1) according to the third aspect, in the first or second aspect, the current collector plate (4) and the bottom (30) are mechanically connected.

この構成によれば、集電板（４）は巻回体（２）の第１電極（２１）と機械的に接続されているため、集電板（４）を介して、底部（３０）と第１電極（２１）とを機械的に接続することができる。   According to this configuration, since the current collector plate (4) is mechanically connected to the first electrode (21) of the wound body (2), the bottom portion (30) is interposed via the current collector plate (4). And the first electrode (21) can be mechanically connected.

第４の態様に係る蓄電デバイス（１）は、第１から第３のいずれか一の態様において、第１巻回端（２４）において、第１電極（２１）と集電板（４）とは第１溶接部（４１）で電気的かつ機械的に接続されている。第１溶接部（４１）は、巻回軸（Ｘ）方向の一方から見て、第１電極（２１）の複数の層にまたがって線状に伸びている。   The electricity storage device (1) according to the fourth aspect is any one of the first to third aspects, in the first winding end (24), the first electrode (21), the current collector plate (4), Are electrically and mechanically connected at the first weld (41). The first welded portion (41) extends linearly across the plurality of layers of the first electrode (21) when viewed from one side in the winding axis (X) direction.

この構成によれば、集電板（４）と第１電極（２１）との溶接箇所を多くすることができるため、蓄電デバイス（１）の抵抗値を低くできる。さらに集電板（４）と第１電極（２１）とを機械的に強固に接続できる。さらに、第１電極（２１）の複数の層を目視しなくとも、集電板（４）と第１電極（２１）とを容易に溶接することができる。   According to this structure, since the welding location of a current collecting plate (4) and a 1st electrode (21) can be increased, the resistance value of an electrical storage device (1) can be made low. Furthermore, the current collector plate (4) and the first electrode (21) can be mechanically and firmly connected. Furthermore, the current collector plate (4) and the first electrode (21) can be easily welded without visually observing the plurality of layers of the first electrode (21).

第５の態様に係る蓄電デバイス（１）は、第４の態様において、集電板（４）と底部（３０）とは、第１溶接部（４１）とは別の第２溶接部（３４）で電気的かつ機械的に接続されている。第２溶接部（３４）は、巻回軸（Ｘ）方向の一方から見て、第１溶接部（４１）と重ならない位置にある。   In the electric storage device (1) according to the fifth aspect, in the fourth aspect, the current collector plate (4) and the bottom (30) are different from the first weld (41) in the second weld (34). ) Are electrically and mechanically connected. The second welded portion (34) is in a position that does not overlap the first welded portion (41) when viewed from one side in the winding axis (X) direction.

この構成によれば、第２溶接部（３４）が第１溶接部（４１）と重ならない位置にあることにより、集電板（４）と底部（３０）とを機械的に強固に接続することができる。   According to this configuration, the current collector plate (4) and the bottom portion (30) are mechanically and firmly connected to each other because the second welded portion (34) is positioned so as not to overlap the first welded portion (41). be able to.

第６の態様に係る蓄電デバイス（１）は、第５の態様において、第２溶接部（３４）は、巻回軸（Ｘ）方向の一方から見て、巻回体（２）の巻き方向に沿って延びる線状である。   In the electricity storage device (1) according to the sixth aspect, in the fifth aspect, the second welded portion (34) is wound in the winding direction of the wound body (2) when viewed from one side in the winding axis (X) direction. Is a line extending along the line.

この構成によれば、第１溶接部（４１）が第１電極（２１）の複数の層にまたがる線状であり、第２溶接部（３４）が巻回体（２）の巻き方向に沿って延びる線状であるため、第１溶接部（４１）を避けつつ、集電板（４）と底部（３０）との溶接面積を確保できる。   According to this structure, the 1st welding part (41) is linear covering the several layer of a 1st electrode (21), and a 2nd welding part (34) follows the winding direction of a wound body (2). Therefore, the welding area between the current collector plate (4) and the bottom portion (30) can be secured while avoiding the first welded portion (41).

第７の態様に係る蓄電デバイス（１）は、第１から第６のいずれか一の態様において、底部（３０）は、開裂可能な溝（３５０）を有する開放部（３５）を含む。   In the electricity storage device (1) according to the seventh aspect, in any one of the first to sixth aspects, the bottom part (30) includes an open part (35) having a cleavable groove (350).

この構成によれば、蓄電デバイス（１）の充放電の繰り返しで発生したガスを、開裂した溝（３５０）から放出させることができる。   According to this configuration, the gas generated by repeated charging / discharging of the electricity storage device (1) can be released from the cleaved groove (350).

第８の態様に係る蓄電デバイス（１）は、第７の態様において、底部（３０）における開放部（３５）の厚みは、底部（３０）における開放部（３５）以外の部分の厚みよりも小さい。   The electric storage device (1) according to the eighth aspect is the seventh aspect, wherein the thickness of the open portion (35) in the bottom portion (30) is larger than the thickness of the portion other than the open portion (35) in the bottom portion (30). small.

この構成によれば、溝（３５０）開裂し易くでき、蓄電デバイス（１）の充放電の繰り返しで発生したガスを、溝（３５０）から放出させやすくできる。また蓄電デバイス（１）内で発生したガスの圧力によって、底部（３０）における開放部（３５）以外の部分が変形することを抑制できる。   According to this configuration, the groove (350) can be easily cleaved, and the gas generated by repeated charge / discharge of the electricity storage device (1) can be easily released from the groove (350). Moreover, it can suppress that parts other than the open part (35) in a bottom part (30) deform | transform with the pressure of the gas which generate | occur | produced in the electrical storage device (1).

第９の態様に係る蓄電デバイス（１）は、第７又は第８の態様において、底部（３０）において、第２溶接部（３４）は開放部（３５）以外の部分に位置している。   In the electricity storage device (1) according to the ninth aspect, in the seventh or eighth aspect, in the bottom part (30), the second welded part (34) is located in a part other than the open part (35).

この構成によれば、蓄電デバイス（１）の充放電の繰り返しで発生したガスの圧力によって溝（３５０）が開裂した場合に、第２溶接部（３４）における集電板（４）と底部（３０）との接続が外れることを抑制できる。   According to this configuration, when the groove (350) is cleaved by the pressure of gas generated by repeated charging and discharging of the electricity storage device (1), the current collector plate (4) and the bottom ( 30) can be prevented from being disconnected.

第１０の態様に係る蓄電デバイス（１）は、第７から第９のいずれか一の態様において、底部（３０）において、開放部（３５）はケース（３）の内側に向かって凹んでいる。   In the electricity storage device (1) according to the tenth aspect, in any one of the seventh to ninth aspects, in the bottom part (30), the open part (35) is recessed toward the inside of the case (3). .

この構成によれば、底部（３０）に設けられた凹部内で溝（３５０）が開裂することができる。すなわち、底部（３０）に設けられた凹部によって、溝（３５０）が開裂するための空間を確保できる。   According to this structure, a groove | channel (350) can be cleaved within the recessed part provided in the bottom part (30). That is, a space for cleaving the groove (350) can be secured by the recess provided in the bottom (30).

第１１の態様に係る蓄電デバイス（１）は、第７から第１０のいずれか一の態様において、集電板（４）に貫通孔（４０）が設けられている。   In the electricity storage device (1) according to the eleventh aspect, in any one of the seventh to tenth aspects, the current collector plate (4) is provided with a through hole (40).

この構成によれば、蓄電デバイス（１）の充放電の繰り返しで発生したガスを、貫通孔（４０）に導くことができる。   According to this configuration, the gas generated by repeated charge / discharge of the electricity storage device (1) can be guided to the through hole (40).

第１２の態様に係る蓄電デバイス（１）は、第１１の態様において、開放部（３５）の位置と貫通孔（４０）の位置とは、巻回軸（Ｘ）方向の一方から見て、重なっている。   The electricity storage device (1) according to the twelfth aspect is the eleventh aspect, in which the position of the opening (35) and the position of the through hole (40) are viewed from one side in the winding axis (X) direction. overlapping.

この構成によれば、蓄電デバイス（１）内で発生して貫通孔（４０）に導かれたガスを、開放部（３５）から放出させやすくすることができる。このため、蓄電デバイス（１）の充放電の繰り返しで発生したガスを、開放部（３５）から効率よく放出できる。   According to this configuration, the gas generated in the electricity storage device (1) and guided to the through hole (40) can be easily released from the open portion (35). For this reason, the gas which generate | occur | produced by repetition of charging / discharging of an electrical storage device (1) can be discharge | released efficiently from an open part (35).

第１３の態様に係る蓄電モジュール（１００）は、第１１又は第１２の態様において、開放部（３５）は交差した複数の溝（３５０）を有し、複数の溝（３５０）の交点と、貫通孔（４０）の位置とが、巻回軸（Ｘ）方向の一方から見て、重なっている。   In the eleventh or twelfth aspect, an electricity storage module (100) according to a thirteenth aspect has a plurality of intersecting grooves (350), and an intersection of the plurality of grooves (350), The position of the through hole (40) overlaps when viewed from one side in the winding axis (X) direction.

この構成によれば、蓄電デバイス（１）内で発生して貫通孔（４０）に導かれたガスで、溝（３５０）を開裂しやすくできる。このため、蓄電デバイス（１）の充放電の繰り返しで発生したガスを、開放部（３５）から特に効率よく放出できる。   According to this configuration, the groove (350) can be easily cleaved by the gas generated in the electricity storage device (1) and guided to the through hole (40). For this reason, the gas produced | generated by repetition of charging / discharging of an electrical storage device (1) can be discharge | released especially efficiently from an open part (35).

第１４の態様に係る蓄電モジュール（１００）は、第１から第１３のいずれか一の態様に係る蓄電デバイス（１）を複数含み、複数の蓄電デバイス（１）は、導電性を有する導電部材（１１０）によって電気的かつ機械的に接続されている。   The power storage module (100) according to the fourteenth aspect includes a plurality of power storage devices (1) according to any one of the first to thirteenth aspects, and the plurality of power storage devices (1) are conductive members having conductivity. Electrically and mechanically connected by (110).

この構成によれば、蓄電モジュール（１００）に含まれる複数の蓄電デバイス（１）はが低抵抗化されているため、蓄電モジュール（１００）も低抵抗化することができる。   According to this configuration, since the plurality of power storage devices (1) included in the power storage module (100) has low resistance, the power storage module (100) can also have low resistance.

１ 蓄電デバイス
２ 巻回体
２１ 第１電極
２２ 第２電極
２４ 第１巻回端
３ ケース
３０ 底部
４ 集電板
Ｘ 巻回軸 DESCRIPTION OF SYMBOLS 1 Power storage device 2 Winding body 21 1st electrode 22 2nd electrode 24 1st winding end 3 Case 30 Bottom part 4 Current collecting plate X Winding axis

Claims (14)

巻回軸の周囲に巻回された第１電極及び第２電極を含み、前記巻回軸方向の一端に位置する第１巻回端において前記第１電極が露出している巻回体と、
前記巻回体を収容し、底部を有する筒状のケースと、を備え、
前記第１巻回端における前記第１電極と電気的かつ機械的に接続され、かつ、前記第１巻回端と前記底部との間に位置する集電板を更に備える、
蓄電デバイス。 A wound body including a first electrode and a second electrode wound around a winding axis, wherein the first electrode is exposed at a first winding end located at one end in the winding axis direction;
A cylindrical case that houses the wound body and has a bottom,
A current collector that is electrically and mechanically connected to the first electrode at the first winding end and is located between the first winding end and the bottom;
Power storage device. 前記集電板と前記底部とが電気的に接続されている、
請求項１に記載の蓄電デバイス。 The current collector plate and the bottom are electrically connected;
The electricity storage device according to claim 1. 前記集電板と前記底部とが機械的に接続されている、
請求項１又は２に記載の蓄電デバイス。 The current collector plate and the bottom are mechanically connected,
The electricity storage device according to claim 1 or 2. 前記第１巻回端において、前記第１電極と前記集電板とは第１溶接部で電気的かつ機械的に接続されており、
前記第１溶接部は、前記巻回軸方向の一方から見て、前記第１電極の複数の層にまたがって線状に伸びている、
請求項１〜３のいずれか一項に記載の蓄電デバイス。 In the first winding end, the first electrode and the current collector plate are electrically and mechanically connected at a first welded portion,
The first welded portion extends linearly across a plurality of layers of the first electrode as viewed from one of the winding axis directions.
The electrical storage device as described in any one of Claims 1-3. 前記集電板と前記底部とは、前記第１溶接部とは別の第２溶接部で電気的かつ機械的に接続されており、
前記第２溶接部は、前記巻回軸方向の一方から見て、前記第１溶接部と重ならない位置にある、
請求項４に記載の蓄電デバイス。 The current collector plate and the bottom are electrically and mechanically connected to each other at a second welded portion different from the first welded portion,
The second welded portion is in a position not overlapping the first welded portion when viewed from one side in the winding axis direction.
The electricity storage device according to claim 4. 前記第２溶接部は、前記巻回軸方向の一方から見て、前記巻回体の巻き方向に沿って延びる線状である、
請求項５に記載の蓄電デバイス。 The second welded portion has a linear shape extending along the winding direction of the wound body as seen from one of the winding axis directions.
The electricity storage device according to claim 5. 前記底部は、開裂可能な溝を有する開放部を含む、
請求項１〜６のいずれか一項に記載の蓄電デバイス。 The bottom includes an opening having a cleavable groove,
The electrical storage device as described in any one of Claims 1-6. 前記底部における前記開放部の厚みは、前記底部における前記開放部以外の部分の厚みよりも小さい、
請求項７に記載の蓄電デバイス。 The thickness of the open portion at the bottom is smaller than the thickness of the portion other than the open portion at the bottom,
The electricity storage device according to claim 7. 前記底部において、前記第２溶接部は前記開放部以外の部分に位置している、
請求項７又は８に記載の蓄電デバイス。 In the bottom portion, the second welded portion is located in a portion other than the open portion,
The electricity storage device according to claim 7 or 8. 前記底部において、前記開放部は前記ケースの内側に向かって凹んでいる、
請求項７〜９のいずれか一項に記載の蓄電デバイス。 In the bottom portion, the open portion is recessed toward the inside of the case.
The electrical storage device as described in any one of Claims 7-9. 前記集電板に貫通孔が設けられている、
請求項７〜１０のいずれか一項に記載の蓄電デバイス。 A through hole is provided in the current collector plate,
The electrical storage device as described in any one of Claims 7-10. 前記開放部の位置と前記貫通孔の位置とは、前記巻回軸方向の一方から見て、重なっている、
請求項１１に記載の蓄電デバイス。 The position of the opening and the position of the through hole overlap when viewed from one side in the winding axis direction,
The electricity storage device according to claim 11. 前記開放部は交差した複数の溝を有し、
前記複数の溝の交点と、前記貫通孔の位置とが、前記巻回軸方向の一方から見て、重なっている、
請求項１１又は１２に記載の蓄電デバイス。 The opening has a plurality of intersecting grooves,
The intersections of the plurality of grooves and the positions of the through holes overlap when viewed from one side in the winding axis direction.
The electricity storage device according to claim 11 or 12. 請求項１〜１３のいずれか一項に記載の蓄電デバイスを複数含み、
複数の前記蓄電デバイスは、導電性を有する導電部材によって電気的かつ機械的に接続されている、
蓄電モジュール。 Including a plurality of power storage devices according to any one of claims 1 to 13,
The plurality of power storage devices are electrically and mechanically connected by a conductive member having conductivity.
Power storage module.
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