WO2019044613A1 - Power storage device - Google Patents

Power storage device Download PDF

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Publication number
WO2019044613A1
WO2019044613A1 PCT/JP2018/030956 JP2018030956W WO2019044613A1 WO 2019044613 A1 WO2019044613 A1 WO 2019044613A1 JP 2018030956 W JP2018030956 W JP 2018030956W WO 2019044613 A1 WO2019044613 A1 WO 2019044613A1
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WO
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Prior art keywords
electrode
separator
storage device
overlapping portion
corner
Prior art date
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PCT/JP2018/030956
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French (fr)
Japanese (ja)
Inventor
裕二 木村
宏宣 小林
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株式会社村田製作所
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Publication of WO2019044613A1 publication Critical patent/WO2019044613A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/466—U-shaped, bag-shaped or folded
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/52—Separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a power storage device.
  • a power storage device is known as a power supply of various electronic devices (for example, Patent Document 1 etc.).
  • various electronic devices for example, Patent Document 1 etc.
  • the positive electrode, the separator, and the negative electrode are stacked in this order.
  • a separator having a larger area than the positive electrode and the negative electrode is disposed between the positive electrode and the negative electrode.
  • a portion in which the positive electrode and the negative electrode are not disposed and only the separator is disposed is a portion which does not exhibit the function as a power storage device. Therefore, the energy density per unit area of the electricity storage device tends to be smaller as the separator is made larger than the positive electrode and the negative electrode.
  • the main object of the present invention is to provide a storage device having a high energy density per unit area.
  • An electricity storage device includes a first electrode, a second electrode, and a separator.
  • the separator is provided between the first electrode and the second electrode.
  • the separator has a larger area than the first and second electrodes.
  • the separator has a non-overlapping portion that does not overlap with the first and second electrodes in the stacking direction.
  • the non-overlapping portion has a corner or a curved portion. Notches or cuts are provided in the corners or in the bends.
  • the non-overlapping portion is bent along the stacking direction.
  • FIG. 1 is a schematic plan view of the power storage device according to the first embodiment.
  • FIG. 2 is a schematic plan view of the device body in the first embodiment.
  • FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG.
  • FIG. 4 is a schematic plan view of the device body as viewed from the arrow IV of FIG.
  • FIG. 5 is a schematic plan view of the device body before the bending step in the first embodiment.
  • FIG. 6 is a schematic plan view of the device body in the second embodiment.
  • FIG. 7 is a schematic plan view of the device body before the bending step in the second embodiment.
  • FIG. 8 is a schematic plan view of a device body in the third embodiment.
  • FIG. 9 is a schematic plan view of the device body before the folding step in the third embodiment.
  • FIG. 10 is a schematic plan view of a device body in the fourth embodiment.
  • FIG. 11 is a schematic plan view of the device body before the bending step in the fourth embodiment.
  • FIG. 1 is a schematic plan view of the power storage device according to the first embodiment.
  • FIG. 2 is a schematic plan view of the device body in the first embodiment.
  • FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG.
  • FIG. 4 is a schematic plan view of the device body as viewed from the arrow IV of FIG.
  • FIG. 5 is a schematic plan view of the device body before the bending step in the first embodiment.
  • the storage device 1 shown in FIG. 1 is not particularly limited as long as it has a storage function.
  • the storage device 1 may be, for example, a battery such as a secondary battery, or a capacitor such as an electric double layer capacitor.
  • the storage device 1 has a case 10.
  • the case 10 may be, for example, a laminate type package or a case made of metal or the like.
  • Case 10 is non-rectangular. Specifically, the case 10 is substantially L-shaped in plan view. In detail, the case 10 is a rectangular shape having a rectangular notch 10 a at one corner.
  • a device body 20 shown in FIG. 2 and FIG. 3 is disposed, and is filled with an electrolyte.
  • the device body 20 has a first electrode 21, a second electrode 22, and a separator 23.
  • One of the first and second electrodes 21 and 22 constitutes a positive electrode, and the other electrode constitutes a negative electrode.
  • the electrode which comprises the negative electrode among the 1st and 2nd electrodes 21 and 22 is larger area than the electrode which comprises the positive electrode.
  • the area of the electrode constituting the positive electrode may be substantially equal to the area of the electrode constituting the negative electrode, or may be larger than the area of the electrode constituting the negative electrode.
  • the first electrode 21 and the second electrode 22 face each other in the thickness direction (stacking direction) with the separator 23 interposed therebetween.
  • a separator 23 is disposed between the first electrode 21 and the second electrode 22 in the stacking direction.
  • the first electrode 21 and the second electrode 22 are insulated by the separator 23.
  • the separator 23 has a larger area than the first and second electrodes 21 and 22. For this reason, the separator 23 has a non-overlapping portion 23 a which is not overlapped with the first and second electrodes 21 and 22 outside the portion where the first electrode 21 and the second electrode 22 are opposed. doing.
  • the non-overlapping portion 23 a has a corner or a curved portion.
  • the non-overlapping portion 23a includes a first corner C1, a second corner C2, a third corner C3, a fourth corner C4, and a fifth corner C5.
  • the sixth corner C6 is substantially perpendicular.
  • the third corner C3 is an obtuse angle larger than 90 °.
  • the “corner” includes a corner having a rounded tip.
  • the non-overlapping portion 23a of the separator 23 is bent along the virtual line L1 (see FIG. 5) and along the stacking direction as shown in FIG. For this reason, it is possible to reduce the area ratio of the portion where only the separator 23 is provided among the first and second electrodes 21 and 22 and the separator 23 in plan view. Therefore, storage device 1 with high energy density per unit area can be realized.
  • a notch or a notch is not provided at a corner of the non-overlapping portion of the separator, a portion located on one side of the corner of the folded portion of the separator and a portion located on the other side overlap in the surface direction. For this reason, it is difficult to form a bending part suitably, when a notch and a notch are not provided in a corner or a ridgeline part. Therefore, it is difficult to sufficiently reduce the area ratio occupied by the bent portion. Also, if the non-overlapping portion has an obtuse angle greater than 90 °, both sides of the obtuse angle can not be bent. Therefore, it is particularly difficult to sufficiently reduce the area ratio occupied by the bent portion. Therefore, it is difficult to sufficiently increase the energy density per unit area of the power storage device when the notches and the notches are not provided at the corner portions of the non-overlapping portion.
  • the non-overlapping portion 23a can be suitably bent.
  • the notches 23a3 are formed, so that the non-overlapping portions 23a positioned on both sides of the notches 23a3 can be bent.
  • the area ratio of the non-overlapping portions 23a can be reduced. Therefore, storage device 1 with high energy density per unit area can be realized. In other words, the storage device 1 can be miniaturized without lowering the energy density.
  • the non-overlapping portion 23a when the non-overlapping portion 23a is bent, a portion of the separator 23 located on one side of each of the notches 23a1 to 23a4 and a portion located on the other side
  • the notches 23a1 to 23a4 are provided so that they do not overlap.
  • the length along the stacking direction of the bent portion of the non-overlapping portion 23a be smaller than the thickness of the first or second electrode 21 or 22. It is because it can suppress that the bent non-overlapping part 23a overlaps in a surface direction.
  • the bending part of several non-overlapping part 23a is joined.
  • the positions of the first and second electrodes 21 and 22 are regulated by the bent portions of the non-overlapping portion 23a. Therefore, it is effective that a short circuit between the first electrode 21 and the second electrode 22 caused by the positional deviation of the first and second electrodes 21 and 22 constituting the device main body 20 in the non-overlapping portion 23a. Can be suppressed. Therefore, even in the case where the separator 23 with respect to the first and second electrodes 21 and 22 is made smaller in plan view, the first electrode 21 and the second electrode 22 are unlikely to be short-circuited. Therefore, the separator 23 for the first and second electrodes 21 and 22 can be made smaller. As a result, the area ratio occupied by the bent portion of the separator 23 can be reduced. Therefore, the energy density per unit area of the storage device 1 can be further increased.
  • the method of joining the bent portions of the plurality of non-overlapping portions 23a is not particularly limited.
  • Examples of a method of joining the bent portions of the plurality of non-overlapping portions 23a include thermocompression bonding, adhesion, adhesion, and the like.
  • FIG. 6 is a schematic plan view of the device body 20 in the second embodiment.
  • FIG. 7 is a schematic plan view of the device body before the bending step in the second embodiment.
  • FIG. 8 is a schematic plan view of the device body 20 in the third embodiment.
  • FIG. 9 is a schematic plan view of the device body 20 before the bending step in the third embodiment.
  • the shapes of the case 10 and the device body 20 in plan view are substantially L-shaped.
  • the shapes of the case and the device body are not particularly limited.
  • the shape in plan view of the case and the device body may be circular, oval, elliptical, polygonal or the like, and as shown in FIG. 6 and FIG.
  • the plan view shape of the device body 20 may be rectangular. That is, in the present invention, the shape of the case or the device body is not particularly limited as long as it has a corner or a curved portion.
  • the shape of the notch provided at the corner of the separator is a bent portion at the non-overlapping portion 23a. It is not particularly limited as long as it is a shape that can form For example, as shown in FIG. 7 and FIG. 9, triangular or substantially L-shaped notched portions may be provided at the corner portions C7 and C8 of the separator 23. Even in this case, since the non-overlapping portion 23a can be suitably bent, the energy density per unit area of the storage device can be increased.
  • FIG. 10 is a schematic plan view of the device body 20 in the fourth embodiment.
  • FIG. 11 is a schematic plan view of the device body 20 before the bending step in the fourth embodiment.
  • the through hole 41 penetrating along the stacking direction is formed in the device body 20 which is a stacked body of the first and second electrodes 21 and 22 and the separator.
  • the separator 23 is provided with a non-overlapping portion 23 a which is bent along the stacking direction at the peripheral portion of the through hole 41.
  • the non-overlapping portion 23a is provided with a curved portion.
  • the through hole 41 having a circular shape in plan view is provided, the non-overlapping portion 23 a provided with the notch is formed inside the through hole 41, and the non-overlapping portion 23a is bent along the stacking direction.
  • the area ratio of the portion where the first and second electrodes 21 and 22 are not opposed can be reduced. Therefore, also in the present embodiment, the energy density per unit area of the power storage device can be increased.
  • the through hole 41 having a circular shape in plan view is formed in the device body 20 .
  • the through hole may have, for example, a rectangular shape in a plan view, a polygonal shape in a plan view, an elliptical shape in a plan view, an oval shape in a plan view, or the like.
  • the example in which the non-overlapping portion in which the notch is formed on the outer side of the device body is described.
  • an example in which the through hole is provided in the inside of the device body and the non-overlapping portion in which the notch is formed in the inside of the through hole has been described.
  • a non-overlapping portion having a notch formed on the outer side of the device body and a non-overlapping portion having a notch formed on the inside of the through hole may be provided. Good.
  • the non-overlapping portion 23a can be bent by providing a notch in the non-overlapping portion 23a.
  • the present invention is not limited to this configuration.
  • the non-overlapping portion may be bent by providing a cut.
  • An electricity storage device includes a first electrode, a second electrode, and a separator.
  • the separator is provided between the first electrode and the second electrode.
  • the separator has a larger area than the first and second electrodes.
  • the separator has a non-overlapping portion that does not overlap with the first and second electrodes in the stacking direction.
  • the non-overlapping portion has a corner or a curved portion. Notches or cuts are provided in the corners or in the bends.
  • the non-overlapping portion is bent along the stacking direction.
  • the corner or the curved portion of the non-overlapping portion is provided with a notch or a notch.
  • the non-overlapping portion of the separator is suitably bent along the stacking direction. Therefore, the first and second electrodes do not face each other, and the area ratio of the portion where the separator is provided can be reduced. Therefore, according to the present invention, the energy density per unit area of the power storage device can be increased. In other words, according to the present invention, the storage device can be miniaturized without reducing the energy density per unit area.
  • the non-overlapping portion be bent along the stacking direction so that the one side portion and the other side portion of the notch of the non-overlapping portion do not overlap. According to this configuration, the energy density per unit area can be further increased.
  • the separator may have an internal angle greater than 90 °. In that case, it is preferable that a notch or a notch is provided in the inner corner, and the non-overlapping portion is bent along the stacking direction. According to this configuration, the energy density per unit area can be further increased.
  • a through hole may be formed in the laminate of the first and second electrodes and the separator along the stacking direction.
  • a notch or a notch is provided in the peripheral edge portion of the through hole, and a non-overlapping portion which is bent along the stacking direction is provided. According to this configuration, the energy density per unit area can be further increased.
  • a plurality of separators folded along the stacking direction may be provided. In that case, it is preferable that a plurality of separators be joined.
  • case 10a notch in case 20: device body 21: first electrode 22: second electrode 23: separator 23a: non-overlapping portion 23a1, 23a2, 23a3, 23a4: notch 41: penetrating Hole C1: first corner C2: second corner C3: third corner C4: fourth corner C5: fifth corner C6: sixth corner C7: seventh corner C8: Eighth corner

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Cell Separators (AREA)
  • Secondary Cells (AREA)

Abstract

A power storage device with high energy density per unit area is provided. This power source device (1) is provided with a first electrode (21), a second electrode (22), and a separator (23). The separator (23) is disposed between the first electrode (21) and the second electrode (22). The separator (23) has a greater surface area than the first and second electrodes (21), (22), and has a nonoverlapping part (23a) that does not overlap with the first and second electrodes (21), (22) in the direction of lamination. The nonoverlapping part (23a) has a corner part or a curved part. A notch or cut is provided in the corner part or curved part. The nonoverlapping part (23a) is folded in the lamination direction.

Description

蓄電デバイスPower storage device
　本発明は、蓄電デバイスに関する。 The present invention relates to a power storage device.
　従来、種々の電子機器の電源として、蓄電デバイスが知られている（例えば、特許文献１等）。例えば、二次電池や電気二重層コンデンサ等の蓄電デバイスでは、正極と、セパレータと、負極とがこの順番で積層されている。 Conventionally, a power storage device is known as a power supply of various electronic devices (for example, Patent Document 1 etc.). For example, in power storage devices such as secondary batteries and electric double layer capacitors, the positive electrode, the separator, and the negative electrode are stacked in this order.
特表２０１５－５２８６２９号公報Japanese Patent Publication No. 2015-528629
　一般的に、正極と負極との接触を抑制するために、正極と負極との間に、正極及び負極よりも大面積なセパレータが配されている。しかしながら、正極及び負極が配されておらず、セパレータのみが配されている部分は、蓄電デバイスとしての機能を発揮しない部分である。従って、正極及び負極よりもセパレータを大きくするほど、蓄電デバイスの単位面積当たりのエネルギー密度が小さくなる傾向にある。 Generally, in order to suppress contact between the positive electrode and the negative electrode, a separator having a larger area than the positive electrode and the negative electrode is disposed between the positive electrode and the negative electrode. However, a portion in which the positive electrode and the negative electrode are not disposed and only the separator is disposed is a portion which does not exhibit the function as a power storage device. Therefore, the energy density per unit area of the electricity storage device tends to be smaller as the separator is made larger than the positive electrode and the negative electrode.
　本発明の主な目的は、単位面積あたりのエネルギー密度が高い蓄電デバイスを提供することにある。 The main object of the present invention is to provide a storage device having a high energy density per unit area.
　本発明に係る蓄電デバイスは、第１の電極と、第２の電極と、セパレータとを備える。セパレータは、第１の電極と第２の電極との間に設けられている。セパレータは、第１及び第２の電極よりも大面積である。セパレータは、第１及び第２の電極と積層方向に重畳していない非重畳部を有する。非重畳部は、角部又は湾曲部を有する。角部又は湾曲部に、切欠き又は切り込みが設けられている。非重畳部が積層方向に沿って折り曲げられている。 An electricity storage device according to the present invention includes a first electrode, a second electrode, and a separator. The separator is provided between the first electrode and the second electrode. The separator has a larger area than the first and second electrodes. The separator has a non-overlapping portion that does not overlap with the first and second electrodes in the stacking direction. The non-overlapping portion has a corner or a curved portion. Notches or cuts are provided in the corners or in the bends. The non-overlapping portion is bent along the stacking direction.
　本発明によれば、単位面積あたりのエネルギー密度が高い蓄電デバイスを提供することができる。 According to the present invention, it is possible to provide a storage device having a high energy density per unit area.
図１は、第１の実施形態に係る蓄電デバイスの模式的平面図である。FIG. 1 is a schematic plan view of the power storage device according to the first embodiment. 図２は、第１の実施形態におけるデバイス本体の模式的平面図である。FIG. 2 is a schematic plan view of the device body in the first embodiment. 図３は、図２の線ＩＩＩ－ＩＩＩにおける模式的断面図である。FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. 図４は、図２の矢印ＩＶから視たときのデバイス本体の模式的平面図である。FIG. 4 is a schematic plan view of the device body as viewed from the arrow IV of FIG. 図５は、第１の実施形態における、折り曲げ工程前のデバイス本体の模式的平面図である。FIG. 5 is a schematic plan view of the device body before the bending step in the first embodiment. 図６は、第２の実施形態におけるデバイス本体の模式的平面図である。FIG. 6 is a schematic plan view of the device body in the second embodiment. 図７は、第２の実施形態における、折り曲げ工程前のデバイス本体の模式的平面図である。FIG. 7 is a schematic plan view of the device body before the bending step in the second embodiment. 図８は、第３の実施形態におけるデバイス本体の模式的平面図である。FIG. 8 is a schematic plan view of a device body in the third embodiment. 図９は、第３の実施形態における、折り曲げ工程前のデバイス本体の模式的平面図である。FIG. 9 is a schematic plan view of the device body before the folding step in the third embodiment. 図１０は、第４の実施形態におけるデバイス本体の模式的平面図である。FIG. 10 is a schematic plan view of a device body in the fourth embodiment. 図１１は、第４の実施形態における、折り曲げ工程前のデバイス本体の模式的平面図である。FIG. 11 is a schematic plan view of the device body before the bending step in the fourth embodiment.
　以下、本発明を実施した好ましい形態の一例について説明する。但し、下記の実施形態は、単なる例示である。本発明は、下記の実施形態に何ら限定されない。 Hereinafter, an example of the preferable form which implemented this invention is demonstrated. However, the following embodiments are merely illustrative. The present invention is not at all limited to the following embodiments.
　また、実施形態等において参照する各図面において、実質的に同一の機能を有する部材は同一の符号で参照することとする。また、実施形態等において参照する図面は、模式的に記載されたものである。図面に描画された物体の寸法の比率などは、現実の物体の寸法の比率などとは異なる場合がある。図面相互間においても、物体の寸法比率等が異なる場合がある。具体的な物体の寸法比率等は、以下の説明を参酌して判断されるべきである。 Moreover, in each drawing referred in the embodiment etc., members having substantially the same functions are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described. The ratio of dimensions of objects drawn in the drawing may differ from the ratio of dimensions of real objects. The dimensional ratio of the object may differ between the drawings. Specific dimensional ratios and the like of objects should be determined in consideration of the following description.
　（第１の実施形態）
　図１は、第１の実施形態に係る蓄電デバイスの模式的平面図である。図２は、第１の実施形態におけるデバイス本体の模式的平面図である。図３は、図２の線ＩＩＩ－ＩＩＩにおける模式的断面図である。図４は、図２の矢印ＩＶから視たときのデバイス本体の模式的平面図である。図５は、第１の実施形態における、折り曲げ工程前のデバイス本体の模式的平面図である。 First Embodiment
FIG. 1 is a schematic plan view of the power storage device according to the first embodiment. FIG. 2 is a schematic plan view of the device body in the first embodiment. FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG. FIG. 4 is a schematic plan view of the device body as viewed from the arrow IV of FIG. FIG. 5 is a schematic plan view of the device body before the bending step in the first embodiment.
　図１に示す蓄電デバイス１は、蓄電機能を有するデバイスであれば特に限定されない。蓄電デバイス１は、例えば、二次電池等の電池、電気二重層コンデンサ等のコンデンサ等であってもよい。 The storage device 1 shown in FIG. 1 is not particularly limited as long as it has a storage function. The storage device 1 may be, for example, a battery such as a secondary battery, or a capacitor such as an electric double layer capacitor.
　蓄電デバイス１は、ケース１０を有している。ケース１０は、例えば、ラミネート型パッケージであってもよいし、金属等により構成されたケースであってもよい。 The storage device 1 has a case 10. The case 10 may be, for example, a laminate type package or a case made of metal or the like.
　ケース１０は、非矩形状である。具体的には、ケース１０は、平面視略Ｌ字状である。詳細には、ケース１０は、一の角部に矩形状の切欠き１０ａを有する矩形状である。 Case 10 is non-rectangular. Specifically, the case 10 is substantially L-shaped in plan view. In detail, the case 10 is a rectangular shape having a rectangular notch 10 a at one corner.
　ケース１０の内部には、図２及び図３に示すデバイス本体２０が配されており、電解質が充填されている。デバイス本体２０は、第１の電極２１と、第２の電極２２と、セパレータ２３とを有する。第１及び第２の電極２１，２２のうちの一方の電極が正極を構成しており、他方の電極が負極を構成している。第１及び第２の電極２１，２２のうち負極を構成している電極が、正極を構成している電極よりも大面積であることが好ましい。もっとも、正極を構成している電極の面積が、負極を構成している電極の面積と実質的に等しくてもよいし、負極を構成している電極の面積よりも大きくてもよい。 Inside the case 10, a device body 20 shown in FIG. 2 and FIG. 3 is disposed, and is filled with an electrolyte. The device body 20 has a first electrode 21, a second electrode 22, and a separator 23. One of the first and second electrodes 21 and 22 constitutes a positive electrode, and the other electrode constitutes a negative electrode. It is preferable that the electrode which comprises the negative electrode among the 1st and 2nd electrodes 21 and 22 is larger area than the electrode which comprises the positive electrode. However, the area of the electrode constituting the positive electrode may be substantially equal to the area of the electrode constituting the negative electrode, or may be larger than the area of the electrode constituting the negative electrode.
　図３に示すように、第１の電極２１と第２の電極２２とは、セパレータ２３を介して厚み方向（積層方向）において対向している。積層方向において、第１の電極２１と第２の電極２２との間には、セパレータ２３が配されている。このセパレータ２３により、第１の電極２１と第２の電極２２とが絶縁されている。 As shown in FIG. 3, the first electrode 21 and the second electrode 22 face each other in the thickness direction (stacking direction) with the separator 23 interposed therebetween. A separator 23 is disposed between the first electrode 21 and the second electrode 22 in the stacking direction. The first electrode 21 and the second electrode 22 are insulated by the separator 23.
　セパレータ２３は、第１及び第２の電極２１，２２よりも大面積である。このため、セパレータ２３は、第１の電極２１と第２の電極２２とが対向している部分の外側に、第１及び第２の電極２１，２２と重畳していない非重畳部２３ａを有している。 The separator 23 has a larger area than the first and second electrodes 21 and 22. For this reason, the separator 23 has a non-overlapping portion 23 a which is not overlapped with the first and second electrodes 21 and 22 outside the portion where the first electrode 21 and the second electrode 22 are opposed. doing.
　図２に示すように、非重畳部２３ａは、角部又は湾曲部を有している。本実施形態では、非重畳部２３ａは、第１の角部Ｃ１と、第２の角部Ｃ２と、第３の角部Ｃ３と、第４の角部Ｃ４と、第５の角部Ｃ５と、第６の角部Ｃ６とを有する。第１～第６の角部Ｃ１～Ｃ６のうち、第１、第２、第４～第６の角部Ｃ１，Ｃ２，Ｃ４～Ｃ６は、略直角である。一方、第３の角部Ｃ３は、９０°よりも大きな鈍角である。 As shown in FIG. 2, the non-overlapping portion 23 a has a corner or a curved portion. In the present embodiment, the non-overlapping portion 23a includes a first corner C1, a second corner C2, a third corner C3, a fourth corner C4, and a fifth corner C5. , And the sixth corner C6. Of the first to sixth corner portions C1 to C6, the first, second and fourth to sixth corner portions C1, C2 and C4 to C6 are substantially perpendicular. On the other hand, the third corner C3 is an obtuse angle larger than 90 °.
　なお、本発明において、「角部」には、先端部が丸められた形状を有する角部が含まれるものとする。 In the present invention, the “corner” includes a corner having a rounded tip.
　蓄電デバイス１では、セパレータ２３の非重畳部２３ａが、仮想線Ｌ１（図５を参照。）に沿って、図３に示すように積層方向に沿って折り曲げられている。このため、平面視において、第１及び第２の電極２１，２２並びにセパレータ２３のうち、セパレータ２３のみが設けられている部分の面積割合を低くすることができる。従って、単位面積あたりのエネルギー密度が高い蓄電デバイス１を実現することができる。 In the storage device 1, the non-overlapping portion 23a of the separator 23 is bent along the virtual line L1 (see FIG. 5) and along the stacking direction as shown in FIG. For this reason, it is possible to reduce the area ratio of the portion where only the separator 23 is provided among the first and second electrodes 21 and 22 and the separator 23 in plan view. Therefore, storage device 1 with high energy density per unit area can be realized.
　例えば、セパレータの非重畳部の角部に切欠きや切り込みが設けられていない場合、セパレータの折り曲げ部の角部の一方側に位置する部分と他方側に位置する部分とが面方向において重なる。このため、角部や稜線部に切欠きや切り込みが設けられていない場合、折り曲げ部を好適に形成することが困難である。よって、折り曲げ部の占める面積割合を十分に小さくすることが困難である。また、非重畳部が９０°よりも大きな鈍角を有する場合、その鈍角の両側を折り曲げることができない。よって、折り曲げ部の占める面積割合を十分に小さくすることが特に困難である。従って、非重畳部の角部に切欠きや切り込みが設けられていない場合、蓄電デバイスの単位面積当たりのエネルギー密度を十分に高くすることは困難である。 For example, when a notch or a notch is not provided at a corner of the non-overlapping portion of the separator, a portion located on one side of the corner of the folded portion of the separator and a portion located on the other side overlap in the surface direction. For this reason, it is difficult to form a bending part suitably, when a notch and a notch are not provided in a corner or a ridgeline part. Therefore, it is difficult to sufficiently reduce the area ratio occupied by the bent portion. Also, if the non-overlapping portion has an obtuse angle greater than 90 °, both sides of the obtuse angle can not be bent. Therefore, it is particularly difficult to sufficiently reduce the area ratio occupied by the bent portion. Therefore, it is difficult to sufficiently increase the energy density per unit area of the power storage device when the notches and the notches are not provided at the corner portions of the non-overlapping portion.
　一方、蓄電デバイス１では、図５に示すように、角部の両側に非重畳部２３ａが位置している第１～第４の角部Ｃ１～Ｃ４には、それぞれ、切欠き２３ａ１～２３ａ４が形成されている。このため、非重畳部２３ａを好適に折り曲げることができる。特に、鈍角である第３の角部Ｃ３に関しては、切欠き２３ａ３が形成されることにより、切欠き２３ａ３の両側に位置する非重畳部２３ａを折り曲げることが可能となる。切欠き２３ａ３の両側に位置する非重畳部２３ａを折り曲げることにより、非重畳部２３ａの面積割合を小さくすることができる。従って、単位面積当たりのエネルギー密度が高い蓄電デバイス１を実現可能である。換言すれば、エネルギー密度を低くすることなく蓄電デバイス１の小型化を図ることができる。 On the other hand, in the electric storage device 1, as shown in FIG. 5, in the first to fourth corner portions C1 to C4 in which the non-overlapping portions 23a are positioned on both sides of the corner portions, notches 23a1 to 23a4 are respectively provided. It is formed. Therefore, the non-overlapping portion 23a can be suitably bent. In particular, with respect to the third corner C3 having an obtuse angle, the notches 23a3 are formed, so that the non-overlapping portions 23a positioned on both sides of the notches 23a3 can be bent. By bending the non-overlapping portions 23a positioned on both sides of the notch 23a3, the area ratio of the non-overlapping portions 23a can be reduced. Therefore, storage device 1 with high energy density per unit area can be realized. In other words, the storage device 1 can be miniaturized without lowering the energy density.
　単位面積当たりのエネルギー密度をより高くする観点からは、非重畳部２３ａを折り曲げた際に、セパレータ２３の、切欠き２３ａ１～２３ａ４のそれぞれの一方側に位置する部分と他方側に位置する部分とが重ならないように切欠き２３ａ１～２３ａ４が設けられていることが好ましい。単位面積当たりのエネルギー密度をより高くする観点からは、非重畳部２３ａの折り曲げ部の積層方向に沿った長さが、第１又は第２の電極２１，２２の厚みよりも小さいことが好ましい。面方向において、折り曲げられた非重畳部２３ａが重なることを抑制できるためである。 From the viewpoint of increasing the energy density per unit area, when the non-overlapping portion 23a is bent, a portion of the separator 23 located on one side of each of the notches 23a1 to 23a4 and a portion located on the other side Preferably, the notches 23a1 to 23a4 are provided so that they do not overlap. From the viewpoint of increasing the energy density per unit area, it is preferable that the length along the stacking direction of the bent portion of the non-overlapping portion 23a be smaller than the thickness of the first or second electrode 21 or 22. It is because it can suppress that the bent non-overlapping part 23a overlaps in a surface direction.
　なお、複数の非重畳部２３ａの折り曲げ部は、接合されていることが好ましい。この場合、複数の折り曲げ部を接着しておくことで、非重畳部２３ａの折り曲げ部により、第１及び第２の電極２１，２２の位置が規制される。よって、非重畳部２３ａにデバイス本体２０を構成している第１及び第２の電極２１，２２の位置ずれに起因する第１の電極２１と第２の電極２２とが短絡することを効果的に抑制することができる。従って、平面視において、第１及び第２の電極２１，２２に対するセパレータ２３を小さくした場合であっても、第１の電極２１と第２の電極２２とが短絡しにくい。よって、第１及び第２の電極２１，２２に対するセパレータ２３を小さくできる。その結果、セパレータ２３の折り曲げ部の占める面積割合を小さくできる。よって、蓄電デバイス１の単位面積当たりのエネルギー密度をさらに高くすることができる。 In addition, it is preferable that the bending part of several non-overlapping part 23a is joined. In this case, by bonding a plurality of bent portions, the positions of the first and second electrodes 21 and 22 are regulated by the bent portions of the non-overlapping portion 23a. Therefore, it is effective that a short circuit between the first electrode 21 and the second electrode 22 caused by the positional deviation of the first and second electrodes 21 and 22 constituting the device main body 20 in the non-overlapping portion 23a. Can be suppressed. Therefore, even in the case where the separator 23 with respect to the first and second electrodes 21 and 22 is made smaller in plan view, the first electrode 21 and the second electrode 22 are unlikely to be short-circuited. Therefore, the separator 23 for the first and second electrodes 21 and 22 can be made smaller. As a result, the area ratio occupied by the bent portion of the separator 23 can be reduced. Therefore, the energy density per unit area of the storage device 1 can be further increased.
　複数の非重畳部２３ａの折り曲げ部を接合する方法は、特に限定されない。複数の非重畳部２３ａの折り曲げ部を接合する方法としては、熱圧着、接着、粘着等が挙げられる。 The method of joining the bent portions of the plurality of non-overlapping portions 23a is not particularly limited. Examples of a method of joining the bent portions of the plurality of non-overlapping portions 23a include thermocompression bonding, adhesion, adhesion, and the like.
　以下、本発明の好ましい実施形態の他の例について説明する。以下の説明において、上記第１の実施形態と実質的に共通の機能を有する部材を共通の符号で参照し、説明を省略する。 Hereinafter, other examples of preferred embodiments of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by the same reference numerals, and the description thereof is omitted.
　（第２及び第３の実施形態）
　図６は、第２の実施形態におけるデバイス本体２０の模式的平面図である。図７は、第２の実施形態における、折り曲げ工程前のデバイス本体の模式的平面図である。図８は、第３の実施形態におけるデバイス本体２０の模式的平面図である。図９は、第３の実施形態における、折り曲げ工程前のデバイス本体２０の模式的平面図である。 Second and Third Embodiments
FIG. 6 is a schematic plan view of the device body 20 in the second embodiment. FIG. 7 is a schematic plan view of the device body before the bending step in the second embodiment. FIG. 8 is a schematic plan view of the device body 20 in the third embodiment. FIG. 9 is a schematic plan view of the device body 20 before the bending step in the third embodiment.
　上記第１の実施形態では、ケース１０及びデバイス本体２０の平面視形状が略Ｌ字状である例について説明した。但し、本発明において、ケース及びデバイス本体の形状は特に限定されない。本発明においては、例えば、ケース及びデバイス本体の平面視形状は、円形状、長円形状、楕円形状、多角形状等であってもよいし、図６や図８に示すように、ケース１０及びデバイス本体２０の平面視形状は、矩形状であってもよい。すなわち、本発明において、ケースやデバイス本体の形状は、角部又は湾曲部を有する形状である限りにおいて、特に限定されない。 In the first embodiment, an example in which the shapes of the case 10 and the device body 20 in plan view are substantially L-shaped has been described. However, in the present invention, the shapes of the case and the device body are not particularly limited. In the present invention, for example, the shape in plan view of the case and the device body may be circular, oval, elliptical, polygonal or the like, and as shown in FIG. 6 and FIG. The plan view shape of the device body 20 may be rectangular. That is, in the present invention, the shape of the case or the device body is not particularly limited as long as it has a corner or a curved portion.
　また、第１の実施形態では、略Ｖ字状の切欠きが設けられている例について説明した但し、本発明において、セパレータの角部に設ける切欠きの形状は、非重畳部２３ａに折り曲げ部を形成可能な形状である限りにおいて、特に限定されない。例えば、図７や図９に示すように、セパレータ２３の角部Ｃ７、Ｃ８に三角形状や略Ｌ字状の切欠き部が設けられていてもよい。この場合であっても、非重畳部２３ａを好適に折り曲げることができるため、蓄電デバイスの単位面積当たりのエネルギー密度を高くすることができる。 In the first embodiment, an example in which the substantially V-shaped notch is provided is described. However, in the present invention, the shape of the notch provided at the corner of the separator is a bent portion at the non-overlapping portion 23a. It is not particularly limited as long as it is a shape that can form For example, as shown in FIG. 7 and FIG. 9, triangular or substantially L-shaped notched portions may be provided at the corner portions C7 and C8 of the separator 23. Even in this case, since the non-overlapping portion 23a can be suitably bent, the energy density per unit area of the storage device can be increased.
　（第４の実施形態）
　図１０は、第４の実施形態におけるデバイス本体２０の模式的平面図である。図１１は、第４の実施形態における、折り曲げ工程前のデバイス本体２０の模式的平面図である。 Fourth Embodiment
FIG. 10 is a schematic plan view of the device body 20 in the fourth embodiment. FIG. 11 is a schematic plan view of the device body 20 before the bending step in the fourth embodiment.
　本実施形態に係る蓄電デバイスでは、第１及び第２の電極２１，２２並びにセパレータの積層体であるデバイス本体２０に、積層方向に沿って貫通する貫通孔４１が形成されている。セパレータ２３には、貫通孔４１の周縁部に積層方向に沿って折り曲げられている非重畳部２３ａが設けられている。この非重畳部２３ａに湾曲部が設けられている。本実施形態のように、平面視形状が円形である貫通孔４１が設けられている場合は、貫通孔４１の内側に、切欠きが設けられた非重畳部２３ａが形成され、当該非重畳部２３ａが積層方向に沿って折り曲げられてる。 In the power storage device according to the present embodiment, the through hole 41 penetrating along the stacking direction is formed in the device body 20 which is a stacked body of the first and second electrodes 21 and 22 and the separator. The separator 23 is provided with a non-overlapping portion 23 a which is bent along the stacking direction at the peripheral portion of the through hole 41. The non-overlapping portion 23a is provided with a curved portion. As in the present embodiment, when the through hole 41 having a circular shape in plan view is provided, the non-overlapping portion 23 a provided with the notch is formed inside the through hole 41, and the non-overlapping portion 23a is bent along the stacking direction.
　本実施形態においても、セパレータ２３が配されている一方、第１及び第２の電極２１，２２が対向していない部分の面積割合を低くすることができる。従って、本実施形態においても、蓄電デバイスの単位面積当たりのエネルギー密度を高くすることができる。 Also in this embodiment, while the separator 23 is disposed, the area ratio of the portion where the first and second electrodes 21 and 22 are not opposed can be reduced. Therefore, also in the present embodiment, the energy density per unit area of the power storage device can be increased.
　なお、本実施形態では、平面視円形状の貫通孔４１がデバイス本体２０に形成されている例について説明した。但し、本発明は、この構成に限定されない。貫通孔は、例えば、平面視矩形状であってもよいし、平面視多角形状、平面視楕円形状、平面視長円形状等であってもよい。 In the present embodiment, an example in which the through hole 41 having a circular shape in plan view is formed in the device body 20 has been described. However, the present invention is not limited to this configuration. The through hole may have, for example, a rectangular shape in a plan view, a polygonal shape in a plan view, an elliptical shape in a plan view, an oval shape in a plan view, or the like.
　第１～第３の実施形態では、デバイス本体の外側に切欠きが形成された非重畳部が設けられている例について説明した。一方、第４の実施形態では、デバイス本体の内部に貫通孔が設けられており、貫通孔の内部に切欠きが形成された非重畳部が設けられている例について説明した。例えば、蓄電デバイスの用途によっては、デバイス本体の外側に切欠きが形成された非重畳部が設けられていると共に、貫通孔の内部に切欠きが形成された非重畳部が設けられていてもよい。 In the first to third embodiments, the example in which the non-overlapping portion in which the notch is formed on the outer side of the device body is described. On the other hand, in the fourth embodiment, an example in which the through hole is provided in the inside of the device body and the non-overlapping portion in which the notch is formed in the inside of the through hole has been described. For example, depending on the application of the storage device, a non-overlapping portion having a notch formed on the outer side of the device body and a non-overlapping portion having a notch formed on the inside of the through hole may be provided. Good.
　なお、上記第１～第４の実施形態では、非重畳部２３ａに切欠きを設けることにより、非重畳部２３ａを折り曲げ可能とする例について説明した。但し、本発明は、この構成に限定されない。本発明においては、非重畳部に切り込みを設けることにより折り曲げ可能としてもよい。 In the first to fourth embodiments, an example in which the non-overlapping portion 23a can be bent by providing a notch in the non-overlapping portion 23a has been described. However, the present invention is not limited to this configuration. In the present invention, the non-overlapping portion may be bent by providing a cut.
　本発明に係る蓄電デバイスは、第１の電極と、第２の電極と、セパレータとを備える。セパレータは、第１の電極と第２の電極との間に設けられている。セパレータは、第１及び第２の電極よりも大面積である。セパレータは、第１及び第２の電極と積層方向に重畳していない非重畳部を有する。非重畳部は、角部又は湾曲部を有する。角部又は湾曲部に、切欠き又は切り込みが設けられている。非重畳部が積層方向に沿って折り曲げられている。 An electricity storage device according to the present invention includes a first electrode, a second electrode, and a separator. The separator is provided between the first electrode and the second electrode. The separator has a larger area than the first and second electrodes. The separator has a non-overlapping portion that does not overlap with the first and second electrodes in the stacking direction. The non-overlapping portion has a corner or a curved portion. Notches or cuts are provided in the corners or in the bends. The non-overlapping portion is bent along the stacking direction.
　本発明に係る蓄電デバイスでは、非重畳部の角部又は湾曲部に切欠き又は切り込みが設けられている。このため、セパレータの非重畳部が、積層方向に沿って好適に折り曲げられている。よって、第１及び第２の電極が対向しておらず、セパレータが設けられている部分の面積割合を小さくすることができる。従って、本発明によれば、蓄電デバイスの単位面積当たりのエネルギー密度を高めることができる。換言すれば、本発明によれば、単位面積当たりのエネルギー密度を低下させることなく蓄電デバイスの小型化を図ることができる。 In the electricity storage device according to the present invention, the corner or the curved portion of the non-overlapping portion is provided with a notch or a notch. For this reason, the non-overlapping portion of the separator is suitably bent along the stacking direction. Therefore, the first and second electrodes do not face each other, and the area ratio of the portion where the separator is provided can be reduced. Therefore, according to the present invention, the energy density per unit area of the power storage device can be increased. In other words, according to the present invention, the storage device can be miniaturized without reducing the energy density per unit area.
　非重畳部の切欠きの一方側部分と他方側部分とが重ならないように非重畳部が積層方向に沿って折り曲げられていることが好ましい。この構成によれば、単位面積当たりのエネルギー密度をより高くすることができる。 It is preferable that the non-overlapping portion be bent along the stacking direction so that the one side portion and the other side portion of the notch of the non-overlapping portion do not overlap. According to this configuration, the energy density per unit area can be further increased.
　セパレータは、９０°より大きい内角を有していてもよい。その場合、内角に切欠き又は切り込みが設けられており、非重畳部が積層方向に沿って折り曲げられていることが好ましい。この構成によれば、単位面積当たりのエネルギー密度をより高くすることができる。 The separator may have an internal angle greater than 90 °. In that case, it is preferable that a notch or a notch is provided in the inner corner, and the non-overlapping portion is bent along the stacking direction. According to this configuration, the energy density per unit area can be further increased.
　第１及び第２の電極並びにセパレータの積層体に、積層方向に沿って貫通する貫通孔が形成されていてもよい。その場合、貫通孔の周縁部に、切欠き又は切り込みが設けられており、積層方向に沿って折り曲げられている非重畳部が設けられていることが好ましい。この構成によれば、単位面積当たりのエネルギー密度をより高くすることができる。 A through hole may be formed in the laminate of the first and second electrodes and the separator along the stacking direction. In that case, it is preferable that a notch or a notch is provided in the peripheral edge portion of the through hole, and a non-overlapping portion which is bent along the stacking direction is provided. According to this configuration, the energy density per unit area can be further increased.
　積層方向に沿って折り曲げられたセパレータを複数備えていてもよい。その場合、複数のセパレータが接合されていることが好ましい。 A plurality of separators folded along the stacking direction may be provided. In that case, it is preferable that a plurality of separators be joined.
１　　　　：蓄電デバイス
１０　　　：ケース
１０ａ　　：ケースの切欠き
２０　　　：デバイス本体
２１　　　：第１の電極
２２　　　：第２の電極
２３　　　：セパレータ
２３ａ　　：非重畳部
２３ａ１、２３ａ２、２３ａ３、２３ａ４　：切欠き
４１　　　：貫通孔
Ｃ１　　　：第１の角部
Ｃ２　　　：第２の角部
Ｃ３　　　：第３の角部
Ｃ４　　　：第４の角部
Ｃ５　　　：第５の角部
Ｃ６　　　：第６の角部
Ｃ７　　　：第７の角部
Ｃ８　　　：第８の角部 1: storage device 10: case 10a: notch in case 20: device body 21: first electrode 22: second electrode 23: separator 23a: non-overlapping portion 23a1, 23a2, 23a3, 23a4: notch 41: penetrating Hole C1: first corner C2: second corner C3: third corner C4: fourth corner C5: fifth corner C6: sixth corner C7: seventh corner C8: Eighth corner

Claims (5)

  1. 　第１の電極と、
    　第２の電極と、
    　前記第１の電極と前記第２の電極との間に設けられており、前記第１及び第２の電極よりも大面積であり、前記第１及び第２の電極と積層方向に重畳していない非重畳部を有するセパレータと、
    　を備え、
    　前記非重畳部は、角部又は湾曲部を有し、
    　前記角部又は前記湾曲部に切欠き又は切り込みが設けられており、前記非重畳部が積層方向に沿って折り曲げられている、蓄電デバイス。     A first electrode,
    A second electrode,
    It is provided between the first electrode and the second electrode, has a larger area than the first and second electrodes, and overlaps the first and second electrodes in the stacking direction. A separator having a non-overlapping portion,
    Equipped with
    The non-overlapping portion has a corner or a curved portion,
    A storage device provided with a notch or a cut in the corner or the curved portion, and the non-overlapping portion being bent along a stacking direction.
  2. 　前記非重畳部の前記切欠きの一方側部分と他方側部分とが重ならないように前記非重畳部が積層方向に沿って折り曲げられている、請求項１に記載の蓄電デバイス。 The power storage device according to claim 1, wherein the non-overlapping portion is bent along a stacking direction so that one side portion and the other side portion of the notch of the non-overlapping portion do not overlap.
  3. 　前記セパレータは、９０°より大きい内角を有し、
    　前記内角に切欠き又は切り込みが設けられており、前記非重畳部が積層方向に沿って折り曲げられている、請求項１又は２に記載の蓄電デバイス。     The separator has an internal angle greater than 90 °,
    The electrical storage device according to claim 1, wherein a notch or a notch is provided in the inner corner, and the non-overlapping portion is bent along a stacking direction.
  4. 　前記第１及び第２の電極並びに前記セパレータの積層体に、積層方向に沿って貫通する貫通孔が形成されており、
    　前記貫通孔の周縁部に、前記切欠き又は前記切り込みが設けられており、積層方向に沿って折り曲げられている前記非重畳部が設けられている、請求項１～３のいずれか一項に記載の蓄電デバイス。     In the laminate of the first and second electrodes and the separator, a through hole penetrating along the laminating direction is formed,
    The peripheral portion of the through hole is provided with the notch or the notch, and the non-overlapping portion which is bent along the stacking direction is provided. Storage device of description.
  5. 　積層方向に沿って折り曲げられた前記セパレータを複数備え、
    　前記複数のセパレータが接合されている、請求項１～４のいずれか一項に記載の蓄電デバイス。     A plurality of the separators folded along the stacking direction,
    The power storage device according to any one of claims 1 to 4, wherein the plurality of separators are joined.
PCT/JP2018/030956 2017-08-31 2018-08-22 Power storage device WO2019044613A1 (en)

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JP2019179654A (en) * 2018-03-30 2019-10-17 三洋電機株式会社 Rectangular nonaqueous electrolyte secondary battery and manufacturing method thereof
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