JP2022080243A - Power storage cell and power storage device - Google Patents

Power storage cell and power storage device Download PDF

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JP2022080243A
JP2022080243A JP2021021271A JP2021021271A JP2022080243A JP 2022080243 A JP2022080243 A JP 2022080243A JP 2021021271 A JP2021021271 A JP 2021021271A JP 2021021271 A JP2021021271 A JP 2021021271A JP 2022080243 A JP2022080243 A JP 2022080243A
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storage cell
active material
material layer
positive electrode
space
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卓也 村田
Takuya Murata
幹也 栗田
Mikiya Kurita
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Toyota Industries Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

To provide a power storage cell and a power storage device, capable of reducing an impregnation time of an electrolyte.SOLUTION: A separator 40 segments a space S into a first space S1 where a positive electrode active material layer 22 is positioned and a second space S2 where a negative electrode active material layer 32 is positioned. The power storage cell 10 comprises: a first penetration part extended to a second direction B between the first space S1 and the power storage cell 10; a second penetration part 62 extended to a second direction B between the second space S2 and an external part of the power storage cell 10; a first blockage part that blocks the first penetration part; and a second blockage part 72 that blocks the second penetration part 62.SELECTED DRAWING: Figure 3

Description

本発明は、蓄電セル及び蓄電装置に関する。 The present invention relates to a power storage cell and a power storage device.

蓄電装置として、例えば、特許文献１に記載されるようなリチウムイオン二次電池が知られている。二次電池は、複数の蓄電セルが積層されることで構成されている。
上記の蓄電セルは、一対の集電体と、一対の集電体の一方に設けられた正極活物質層と、一対の集電体の他方に設けられ、正極活物質層に対向配置された負極活物質層と、正極活物質層と負極活物質層との間に挟まれたセパレータと、を備えている。蓄電セルの内部には、流動性のある電解質、例えば電解液が収容されている。 As a power storage device, for example, a lithium ion secondary battery as described in Patent Document 1 is known. The secondary battery is configured by stacking a plurality of storage cells.
The above-mentioned storage cell is provided on one of the pair of current collectors, the positive electrode active material layer provided on one of the pair of current collectors, and the other of the pair of current collectors, and is arranged to face the positive electrode active material layer. It includes a negative electrode active material layer and a separator sandwiched between the positive electrode active material layer and the negative electrode active material layer. A fluid electrolyte, for example, an electrolytic solution, is housed inside the storage cell.

蓄電セルは、一対の集電体の間に配置されるシール部材と、シール部材を貫通して蓄電セルの内外に延びる連通部材と、を備えている。シール部材は、蓄電セルの外部に電解質が漏れることを防止している。連通部材は、蓄電セルの内部に電解質を注入するときの経路、又は蓄電セル内で発生したガスを排出するための経路として使用されている。 The storage cell includes a seal member arranged between a pair of current collectors, and a communication member that penetrates the seal member and extends inside and outside the storage cell. The sealing member prevents the electrolyte from leaking to the outside of the storage cell. The communication member is used as a route for injecting an electrolyte into the storage cell or a route for discharging the gas generated in the storage cell.

特開２０１２－５９４５０号公報Japanese Unexamined Patent Publication No. 2012-59450

上記の蓄電セルにおいて、セパレータは、一対の集電体及びシール部材により区画された空間を、正極活物質層が位置する第１空間と、負極活物質層が位置する第２空間とに区画している。また、連通部材は、蓄電セルの第１空間と蓄電セルの外部との間で延びている。 In the above storage cell, the separator divides the space partitioned by the pair of current collectors and the sealing member into a first space in which the positive electrode active material layer is located and a second space in which the negative electrode active material layer is located. ing. Further, the communication member extends between the first space of the storage cell and the outside of the storage cell.

そのため、連通部材を介して蓄電セル内にゲル電解質や電解液等の流動性のある電解質を注入すると、電解質は、第１空間に注入され、第１空間に位置する正極活物質層に含浸される。また、電解質は、セパレータを通過して第２空間にも移動して、第２空間に位置する負極活物質層に含浸される。一般的に、セパレータは、電解質を吸収保持する構造を有しているため、第１空間に供給された電解質の第２空間への移動において、電解質のセパレータ通過に長い時間がかかり、第２空間に位置する負極活物質層への電解質の含浸がスムーズに進まないこととなる。その結果、蓄電セルへの電解質の注入開始から正極活物質層、負極活物質層及びセパレータに電解質が十分に含浸されて蓄電セルへの電解質の注入完了となるまでの時間が長くなる虞がある。 Therefore, when a fluid electrolyte such as a gel electrolyte or an electrolytic solution is injected into the storage cell via the communication member, the electrolyte is injected into the first space and impregnated into the positive electrode active material layer located in the first space. To. Further, the electrolyte passes through the separator and moves to the second space, and is impregnated into the negative electrode active material layer located in the second space. Generally, since the separator has a structure that absorbs and retains the electrolyte, it takes a long time for the electrolyte to pass through the separator in the movement of the electrolyte supplied to the first space to the second space, and the second space. The impregnation of the electrolyte into the negative electrode active material layer located in the above does not proceed smoothly. As a result, it may take a long time from the start of injection of the electrolyte into the storage cell to the completion of the injection of the electrolyte into the storage cell by sufficiently impregnating the positive electrode active material layer, the negative electrode active material layer and the separator with the electrolyte. ..

上記課題を解決する蓄電セルは、一対の集電体と、前記一対の集電体の一方に設けられた正極活物質層と、前記一対の集電体の他方に設けられ、前記正極活物質層と対向配置された負極活物質層と、対向配置された前記正極活物質層と前記負極活物質層との間に挟まれたセパレータと、前記一対の集電体のそれぞれの外周縁部の間に配置され、前記正極活物質層及び前記負極活物質層を囲む枠状をなすスペーサと、を備え、前記セパレータは、前記一対の集電体及び前記スペーサにより区画された空間を、前記正極活物質層が位置する第１空間と、前記負極活物質層が位置する第２空間とに区画している蓄電セルであって、前記一対の集電体、前記正極活物質層、前記セパレータ、及び前記負極活物質層が重なり合う第１方向に直交する方向を第２方向とすると、前記スペーサに設けられ、且つ前記第１空間と前記蓄電セルの外部との間を前記第２方向に延びる第１貫通部と、前記スペーサに設けられ、且つ前記第２空間と前記蓄電セルの外部との間を前記第２方向に延びる第２貫通部と、前記第１貫通部を閉塞する第１閉塞部と、前記第２貫通部を閉塞する第２閉塞部と、を備える。 The storage cell that solves the above problems is provided on the pair of current collectors, the positive electrode active material layer provided on one of the pair of current collectors, and the positive electrode active material provided on the other side of the pair of current collectors. A negative electrode active material layer arranged to face the layer, a separator sandwiched between the positive electrode active material layer and the negative electrode active material layer arranged to face each other, and an outer peripheral edge portion of each of the pair of current collectors. The separator is provided with a frame-shaped spacer that surrounds the positive electrode active material layer and the negative electrode active material layer, and the separator is a space partitioned by the pair of current collectors and the spacer. A storage cell that is partitioned into a first space in which the active material layer is located and a second space in which the negative electrode active material layer is located, wherein the pair of current collectors, the positive electrode active material layer, and the separator. When the direction orthogonal to the first direction in which the negative electrode active material layers overlap is the second direction, the second direction is provided on the spacer and extends between the first space and the outside of the storage cell in the second direction. A first penetrating portion, a second penetrating portion provided in the spacer and extending between the second space and the outside of the storage cell in the second direction, and a first closing portion that closes the first penetrating portion. And a second closed portion that closes the second penetrating portion.

これによれば、第１閉塞部により第１貫通部が閉塞される前、且つ第２閉塞部により第２貫通部が閉塞される前の状態において、第１貫通部を介して第１空間に電解質を注入でき、且つ第２貫通部を介して第２空間に電解質を注入できる。第１貫通部を介して第１空間に注入された電解質を正極活物質層に含浸させる。これと同時に、第２貫通部を介して第２空間に注入された電解質を負極活物質層に含浸させる。また、セパレータには、第１空間と第２空間の双方に注入された電解質を含浸させる。このため、電解質を注入するための貫通部がスペーサに一つだけ設けられ、当該貫通部が第１空間と蓄電セルの外部との間に延びている場合、又は当該貫通部が第２空間と蓄電セルの外部との間に延びている場合に比べて、正極活物質層、負極活物質層、及びセパレータに電解質が含浸されるまでの時間が短くなる。したがって、蓄電セルに対する電解質の含浸時間を短縮できる。 According to this, in the state before the first penetrating portion is closed by the first closing portion and before the second penetrating portion is closed by the second closing portion, the first space is entered through the first penetrating portion. The electrolyte can be injected and the electrolyte can be injected into the second space through the second penetration. The positive electrode active material layer is impregnated with the electrolyte injected into the first space through the first penetrating portion. At the same time, the negative electrode active material layer is impregnated with the electrolyte injected into the second space through the second penetration portion. Further, the separator is impregnated with the electrolyte injected into both the first space and the second space. Therefore, when only one penetration portion for injecting the electrolyte is provided in the spacer and the penetration portion extends between the first space and the outside of the storage cell, or the penetration portion is the second space. The time required for the positive electrode active material layer, the negative electrode active material layer, and the separator to be impregnated with the electrolyte is shorter than in the case of extending between the storage cell and the outside. Therefore, the impregnation time of the electrolyte in the storage cell can be shortened.

上記の蓄電セルにおいて、前記第１方向で見た平面視において、前記第１貫通部と前記第２貫通部とは重ならないとよい。
蓄電セルに電解質を注入する場合、第１貫通部に接続され、且つ第１貫通部から蓄電セルに電解質を注入する設備と、第２貫通部に接続され、且つ第２貫通部から蓄電セルに電解質を注入する設備とを採用することが考えられる。 In the storage cell, the first penetrating portion and the second penetrating portion may not overlap each other in a plan view viewed in the first direction.
When injecting an electrolyte into a storage cell, a facility connected to the first penetration portion and injecting an electrolyte into the storage cell from the first penetration portion, and a facility connected to the second penetration portion and from the second penetration portion to the storage cell. It is conceivable to adopt equipment for injecting electrolyte.

その点、これによれば、第１貫通部と第２貫通部とが第１方向で重ならないため、第１貫通部に接続される設備と、第２貫通部に接続される設備との干渉を避けることができる。 In that respect, according to this, since the first penetration portion and the second penetration portion do not overlap in the first direction, the equipment connected to the first penetration portion interferes with the equipment connected to the second penetration portion. Can be avoided.

上記の蓄電セルにおいて、前記スペーサは、複数の壁部で構成されて前記平面視において矩形枠状であり、前記第１貫通部は、前記第２貫通部の設けられた前記壁部とは異なる壁部に設けられるとよい。 In the storage cell, the spacer is composed of a plurality of wall portions and has a rectangular frame shape in a plan view, and the first penetration portion is different from the wall portion provided with the second penetration portion. It should be installed on the wall.

これによれば、第１貫通部が第２貫通部の設けられた壁部と同じ壁部に設けられる構成に比べて、第１貫通部と第２貫通部とを離して配置し易い。蓄電セルに対する電解質の注入を行う際、蓄電セルの空間を減圧することがあるが、第１貫通部と第２貫通部とが離れて配置されているほど、減圧できる箇所が離れることになり、蓄電セルの空間を効率良く減圧できる。したがって、蓄電セルの減圧時間を短縮できる。 According to this, it is easier to arrange the first penetrating portion and the second penetrating portion apart from each other as compared with the configuration in which the first penetrating portion is provided on the same wall portion as the wall portion provided with the second penetrating portion. When injecting an electrolyte into the storage cell, the space of the storage cell may be depressurized. The space of the storage cell can be efficiently depressurized. Therefore, the decompression time of the storage cell can be shortened.

また、第１貫通部を介して第１空間に電解質を注入した場合、正極活物質層、負極活物質層、及びセパレータにおける第１貫通部から離れた部位ほど、電解質を含浸させ難い。
その点、これによれば、第１貫通部が第２貫通部の設けられた壁部とは異なる壁部に設けられるため、第１貫通部と第２貫通部とを離して配置し易い。このため、第１貫通部と第２貫通部とが離れるほど、正極活物質層、負極活物質層、及びセパレータに対し電解質を供給する箇所を離すことができ、正極活物質層、負極活物質層、及びセパレータに対し電解質を含浸させ易くできる。したがって、蓄電セルに対する電解質の含浸時間をさらに短縮できる。 Further, when the electrolyte is injected into the first space through the first penetrating portion, it is more difficult to impregnate the electrolyte in the positive electrode active material layer, the negative electrode active material layer, and the portion of the separator farther from the first penetrating portion.
In that respect, according to this, since the first penetrating portion is provided on a wall portion different from the wall portion provided with the second penetrating portion, the first penetrating portion and the second penetrating portion can be easily arranged apart from each other. Therefore, the farther the first penetrating portion and the second penetrating portion are, the more the positive electrode active material layer, the negative electrode active material layer, and the portion where the electrolyte is supplied to the separator can be separated, and the positive electrode active material layer and the negative electrode active material can be separated. The layer and the separator can be easily impregnated with the electrolyte. Therefore, the impregnation time of the electrolyte in the storage cell can be further shortened.

上記課題を解決する蓄電装置は、積層された複数の蓄電セルを備え、前記複数の蓄電セルは、上述の蓄電セルを含む。
これによれば、蓄電装置においても同様に、電解質の含浸時間を短縮できる。 The power storage device for solving the above problems includes a plurality of stacked power storage cells, and the plurality of power storage cells include the above-mentioned power storage cells.
According to this, the impregnation time of the electrolyte can be shortened in the power storage device as well.

この発明によれば、蓄電セル及び蓄電装置に対する電解質の含浸時間を短縮できる。 According to the present invention, the impregnation time of the electrolyte in the power storage cell and the power storage device can be shortened.

蓄電装置を示す断面図。Sectional drawing which shows the power storage device. 第１の実施形態における蓄電セルの斜視図。The perspective view of the storage cell in 1st Embodiment. 図２の３－３線で切断したときの断面図。FIG. 2 is a cross-sectional view taken along the line 3-3 of FIG. 図２の４－４線で切断したときの断面図。FIG. 2 is a cross-sectional view taken along the line 4-4 of FIG. 第２の実施形態における蓄電セルの斜視図。The perspective view of the storage cell in the 2nd Embodiment. 図５の６－６線で切断したときの断面図。FIG. 5 is a cross-sectional view taken along the line 6-6 of FIG. 蓄電セルに電解質を注入する際に使用する装置の一例を模式的に示す図。The figure which shows an example of the apparatus used when injecting an electrolyte into a storage cell schematically. 変更例における第１貫通部と第２貫通部を示す断面図。The cross-sectional view which shows the 1st penetration part and the 2nd penetration part in the modified example. 変更例における第１貫通部と第２貫通部を示す断面図。The cross-sectional view which shows the 1st penetration part and the 2nd penetration part in the modified example.

＜第１の実施形態＞
以下、蓄電セル及び蓄電装置を具体化した第１の実施形態を図１～図４にしたがって説明する。 <First Embodiment>
Hereinafter, the first embodiment in which the power storage cell and the power storage device are embodied will be described with reference to FIGS. 1 to 4.

図１に示すように、蓄電装置１は、積層された複数の蓄電セル１０により構成されるセルスタック２を含んでいる。複数の蓄電セル１０が積層される方向を積層方向Ｃとする。積層方向Ｃは、重力方向と一致している。積層方向Ｃにおいて蓄電セル１０を外側から見ることを平面視と呼ぶ。 As shown in FIG. 1, the power storage device 1 includes a cell stack 2 composed of a plurality of stacked power storage cells 10. The direction in which the plurality of storage cells 10 are stacked is defined as the stacking direction C. The stacking direction C coincides with the direction of gravity. Looking at the storage cell 10 from the outside in the stacking direction C is called a plan view.

図３及び図４に示すように、蓄電セル１０は、正極２０と、負極３０と、セパレータ４０と、スペーサ５０と、を備えている。
正極２０は、例えば矩形状の電極である。正極２０は、平面視で矩形状の正極集電体２１、及び正極活物質層２２を有している。正極集電体２１は、第１面２１ａと、第１面２１ａとは反対側に位置する第２面２１ｂとを有している。正極集電体２１は、外周縁２１ｃを有する。正極集電体２１は、第１面２１ａにおける外周縁２１ｃ寄りに位置する外周縁部２１ｄを有する。正極活物質層２２は、正極集電体２１の第１面２１ａに設けられている。正極集電体２１の第２面２１ｂには、正極活物質層２２は設けられていない。 As shown in FIGS. 3 and 4, the storage cell 10 includes a positive electrode 20, a negative electrode 30, a separator 40, and a spacer 50.
The positive electrode 20 is, for example, a rectangular electrode. The positive electrode 20 has a positive electrode current collector 21 and a positive electrode active material layer 22 which are rectangular in plan view. The positive electrode current collector 21 has a first surface 21a and a second surface 21b located on the opposite side of the first surface 21a. The positive electrode current collector 21 has an outer peripheral edge 21c. The positive electrode current collector 21 has an outer peripheral edge portion 21d located closer to the outer peripheral edge 21c on the first surface 21a. The positive electrode active material layer 22 is provided on the first surface 21a of the positive electrode current collector 21. The positive electrode active material layer 22 is not provided on the second surface 21b of the positive electrode current collector 21.

負極３０は、例えば矩形状の電極である。負極３０は、平面視で矩形状の負極集電体３１、及び負極活物質層３２を有している。負極集電体３１は、第１面３１ａと、第１面３１ａとは反対側に位置する第２面３１ｂとを有している。負極集電体３１は、外周縁３１ｃを有する。負極集電体３１は、第１面３１ａにおける外周縁３１ｃ寄りに位置する外周縁部３１ｄを有する。負極活物質層３２は、負極集電体３１の第１面３１ａに設けられている。負極集電体３１の第２面３１ｂには、負極活物質層３２は設けられていない。ここで、正極集電体２１及び負極集電体３１は、一対の集電体の一例であり、正極集電体２１は、一対の集電体の一方であり、負極集電体３１は、一対の集電体の他方である。 The negative electrode 30 is, for example, a rectangular electrode. The negative electrode 30 has a rectangular negative electrode current collector 31 and a negative electrode active material layer 32 in a plan view. The negative electrode current collector 31 has a first surface 31a and a second surface 31b located on the side opposite to the first surface 31a. The negative electrode current collector 31 has an outer peripheral edge 31c. The negative electrode current collector 31 has an outer peripheral edge portion 31d located closer to the outer peripheral edge 31c on the first surface 31a. The negative electrode active material layer 32 is provided on the first surface 31a of the negative electrode current collector 31. The negative electrode active material layer 32 is not provided on the second surface 31b of the negative electrode current collector 31. Here, the positive current collector 21 and the negative negative current collector 31 are examples of a pair of current collectors, the positive positive current collector 21 is one of the pair of current collectors, and the negative negative current collector 31 is. The other of the pair of current collectors.

正極集電体２１の第１面２１ａと負極集電体３１の第１面３１ａとは対向している。正極活物質層２２と負極活物質層３２とは対向配置されている。セパレータ４０は、対向配置された正極活物質層２２と負極活物質層３２との間に挟まれている。つまり、正極２０と負極３０とは、セパレータ４０を介して重なり合っている。正極集電体２１、負極集電体３１、正極活物質層２２、セパレータ４０、及び負極活物質層３２が重なり合う方向を第１方向Ａとし、第１方向Ａに直交する方向を第２方向Ｂとする。第１方向Ａは、積層方向Ｃと一致している。このため、第１方向Ａにおいて蓄電セル１０を見ることも平面視と記載する。 The first surface 21a of the positive electrode current collector 21 and the first surface 31a of the negative electrode current collector 31 face each other. The positive electrode active material layer 22 and the negative electrode active material layer 32 are arranged so as to face each other. The separator 40 is sandwiched between the positive electrode active material layer 22 and the negative electrode active material layer 32 arranged so as to face each other. That is, the positive electrode 20 and the negative electrode 30 overlap each other via the separator 40. The direction in which the positive electrode current collector 21, the negative electrode current collector 31, the positive electrode active material layer 22, the separator 40, and the negative electrode active material layer 32 overlap is defined as the first direction A, and the direction orthogonal to the first direction A is the second direction B. And. The first direction A coincides with the stacking direction C. Therefore, looking at the storage cell 10 in the first direction A is also described as a plan view.

正極活物質層２２及び負極活物質層３２は、それぞれ矩形状に形成されている。負極活物質層３２は、正極活物質層２２よりも一回り大きく形成されている。平面視において、正極活物質層２２の形成領域の全体が、負極活物質層３２の形成領域の内側に位置している。 The positive electrode active material layer 22 and the negative electrode active material layer 32 are each formed in a rectangular shape. The negative electrode active material layer 32 is formed to be one size larger than the positive electrode active material layer 22. In a plan view, the entire forming region of the positive electrode active material layer 22 is located inside the forming region of the negative electrode active material layer 32.

セパレータ４０は、平面視において、負極活物質層３２の形成領域よりも大きい矩形状をなしている。セパレータ４０は、平面視において、正極集電体２１及び負極集電体３１よりも小さい矩形状をなしている。セパレータ４０は、第１方向Ａにおいて、正極活物質層２２及び負極活物質層３２に対向しない非対向部４１を有している。セパレータ４０は、第１方向Ａにおける正極活物質層２２寄りに下面４０ａを有し、第１方向Ａにおける負極活物質層３２寄りに上面４０ｂを有する。 The separator 40 has a rectangular shape larger than the formation region of the negative electrode active material layer 32 in a plan view. The separator 40 has a rectangular shape smaller than that of the positive electrode current collector 21 and the negative electrode current collector 31 in a plan view. The separator 40 has a non-opposing portion 41 that does not face the positive electrode active material layer 22 and the negative electrode active material layer 32 in the first direction A. The separator 40 has a lower surface 40a closer to the positive electrode active material layer 22 in the first direction A and an upper surface 40b closer to the negative electrode active material layer 32 in the first direction A.

図２、図３、及び図４に示すように、スペーサ５０は、正極集電体２１と負極集電体３１との間に位置する。スペーサ５０は、絶縁材料を含み、正極集電体２１と負極集電体３１とを絶縁することにより正極集電体２１と負極集電体３１との短絡を防止する。本実施形態では、スペーサ５０の材料は、酸変性ポリエチレンである。なお、スペーサ５０の材料としては、酸変性ポリエチレン以外にも、例えば、ポリエチレン（ＰＥ）、ポリスチレン（ＰＳ）、ポリプロピレン（ＰＰ）、変性ポリプロピレン（変性ＰＰ）、ＡＢＳ樹脂、及びＡＳ樹脂等の種々の樹脂材料を用いることができる。 As shown in FIGS. 2, 3 and 4, the spacer 50 is located between the positive electrode current collector 21 and the negative electrode current collector 31. The spacer 50 contains an insulating material and insulates the positive electrode current collector 21 and the negative electrode current collector 31 to prevent a short circuit between the positive electrode current collector 21 and the negative electrode current collector 31. In this embodiment, the material of the spacer 50 is acid-modified polyethylene. In addition to the acid-modified polyethylene, various materials for the spacer 50 include, for example, polyethylene (PE), polystyrene (PS), polypropylene (PP), modified polypropylene (modified PP), ABS resin, and AS resin. A resin material can be used.

スペーサ５０は、正極集電体２１の外周縁部２１ｄと、負極集電体３１の外周縁部３１ｄとの間に配置されている。
スペーサ５０は、正極活物質層２２及び負極活物質層３２を囲む枠状をなしている。平面視において、スペーサ５０は、四角枠状をなしている。スペーサ５０は、スペーサ５０の壁部としての第１スペーサ壁部５０ａ、第２スペーサ壁部５０ｂ、第３スペーサ壁部５０ｃ、及び第４スペーサ壁部５０ｄを有する。 The spacer 50 is arranged between the outer peripheral edge portion 21d of the positive electrode current collector 21 and the outer peripheral edge portion 31d of the negative electrode current collector 31.
The spacer 50 has a frame shape surrounding the positive electrode active material layer 22 and the negative electrode active material layer 32. In a plan view, the spacer 50 has a square frame shape. The spacer 50 has a first spacer wall portion 50a, a second spacer wall portion 50b, a third spacer wall portion 50c, and a fourth spacer wall portion 50d as wall portions of the spacer 50.

スペーサ５０は、正極集電体２１の外周縁部２１ｄと負極集電体３１の外周縁部３１ｄとの間に挟まれている部分と、正極集電体２１の外周縁２１ｃ及び負極集電体３１の外周縁３１ｃよりも外側に位置する部分とを有している。スペーサ５０は、複数の枠状の構成体により構成されている。本実施形態において、スペーサ５０は、第１構成体５１と第２構成体５２とを第１方向Ａで重ねることで構成されている。第１構成体５１及び第２構成体５２は、四角枠状をなしている。 The spacer 50 includes a portion sandwiched between the outer peripheral edge portion 21d of the positive electrode current collector 21 and the outer peripheral edge portion 31d of the negative electrode current collector 31, and the outer peripheral edge 21c and the negative electrode current collector of the positive electrode current collector 21. It has a portion located outside the outer peripheral edge 31c of 31. The spacer 50 is composed of a plurality of frame-shaped components. In the present embodiment, the spacer 50 is configured by overlapping the first component 51 and the second component 52 in the first direction A. The first constituent body 51 and the second constituent body 52 have a square frame shape.

図２に示すように、第１構成体５１は、４つの壁部を備える。第１構成体５１を構成する４つの壁部を、第１壁部５１１、第２壁部５１２、第３壁部５１３、及び第４壁部５１４とする。第１壁部５１１には、第２壁部５１２及び第３壁部５１３が連続している。第４壁部５１４には、第２壁部５１２及び第３壁部５１３が連続している。平面視において、第１壁部５１１と第４壁部５１４は、平行に延びている。平面視において、第２壁部５１２と第３壁部５１３とは、平行に延びている。 As shown in FIG. 2, the first structure 51 includes four wall portions. The four wall portions constituting the first component 51 are referred to as a first wall portion 511, a second wall portion 512, a third wall portion 513, and a fourth wall portion 514. The second wall portion 512 and the third wall portion 513 are continuous with the first wall portion 511. The second wall portion 512 and the third wall portion 513 are continuous with the fourth wall portion 514. In a plan view, the first wall portion 511 and the fourth wall portion 514 extend in parallel. In a plan view, the second wall portion 512 and the third wall portion 513 extend in parallel.

平面視において、第２壁部５１２と第３壁部５１３との間で、第１壁部５１１が延びる方向を第１延設方向Ｄ１とし、第４壁部５１４が延びる方向を第４延設方向Ｄ４とする。平面視において、第１壁部５１１と第４壁部５１４との間で、第２壁部５１２が延びる方向を第２延設方向Ｄ２とし、第３壁部５１３が延びる方向を第３延設方向Ｄ３とする。第１延設方向Ｄ１と第２延設方向Ｄ２とは直交している。第１延設方向Ｄ１と第３延設方向Ｄ３とは直交している。第２延設方向Ｄ２と第３延設方向Ｄ３とは平行をなしている。第２延設方向Ｄ２と第４延設方向Ｄ４とは直交している。第３延設方向Ｄ３と第４延設方向Ｄ４とは直交している。第１延設方向Ｄ１と第４延設方向Ｄ４とは平行をなしている。第１構成体５１は、矩形枠状をなしている。 In a plan view, the direction in which the first wall portion 511 extends is the first extension direction D1 and the direction in which the fourth wall portion 514 extends is the fourth extension between the second wall portion 512 and the third wall portion 513. The direction is D4. In a plan view, the direction in which the second wall portion 512 extends is the second extension direction D2 and the direction in which the third wall portion 513 extends is the third extension between the first wall portion 511 and the fourth wall portion 514. The direction is D3. The first extension direction D1 and the second extension direction D2 are orthogonal to each other. The first extension direction D1 and the third extension direction D3 are orthogonal to each other. The second extension direction D2 and the third extension direction D3 are parallel to each other. The second extension direction D2 and the fourth extension direction D4 are orthogonal to each other. The third extension direction D3 and the fourth extension direction D4 are orthogonal to each other. The first extension direction D1 and the fourth extension direction D4 are parallel to each other. The first structure 51 has a rectangular frame shape.

第２構成体５２は、４つの壁部を備える。第２構成体５２を構成する４つ壁部を、第１壁部５２１、第２壁部５２２、第３壁部５２３、及び第４壁部５２４とする。第２構成体５２は、第１構成体５１と同様の構成を有している。すなわち、第１壁部５２１は、第１壁部５１１と同じ構成を有し、第１延設方向Ｄ１に延びている。第２壁部５２２は、第２壁部５１２と同じ構成を有し、第２延設方向Ｄ２に延びている。第３壁部５２３は、第３壁部５１３と同じ構成を有し、第３延設方向Ｄ３に延びている。第４壁部５２４は、第４壁部５１４と同じ構成を有し、第４延設方向Ｄ４に延びている。第２構成体５２は、矩形枠状をなしている。 The second structure 52 includes four wall portions. The four wall portions constituting the second component 52 are referred to as a first wall portion 521, a second wall portion 522, a third wall portion 523, and a fourth wall portion 524. The second structure 52 has the same structure as the first body 51. That is, the first wall portion 521 has the same configuration as the first wall portion 511 and extends in the first extension direction D1. The second wall portion 522 has the same configuration as the second wall portion 512 and extends in the second extension direction D2. The third wall portion 523 has the same configuration as the third wall portion 513 and extends in the third extension direction D3. The fourth wall portion 524 has the same configuration as the fourth wall portion 514 and extends in the fourth extension direction D4. The second structure 52 has a rectangular frame shape.

第１壁部５１１と第１壁部５２１、第２壁部５１２と第２壁部５２２、第３壁部５１３と第３壁部５２３、及び第４壁部５１４と第４壁部５２４は、第１方向Ａにおいて重なっている。よって、第１方向Ａに重なる第１壁部５１１と第１壁部５２１とから、第１スペーサ壁部５０ａが構成されている。第１方向Ａに重なる第２壁部５１２と第２壁部５２２とから、第２スペーサ壁部５０ｂが構成されている。第１方向Ａに重なる第３壁部５１３と第３壁部５２３とから、第３スペーサ壁部５０ｃが構成されている。第１方向Ａに重なる第４壁部５１４と第４壁部５２４とから、第４スペーサ壁部５０ｄが構成されている。 The first wall portion 511 and the first wall portion 521, the second wall portion 512 and the second wall portion 522, the third wall portion 513 and the third wall portion 523, and the fourth wall portion 514 and the fourth wall portion 524 are They overlap in the first direction A. Therefore, the first spacer wall portion 50a is configured from the first wall portion 511 and the first wall portion 521 that overlap in the first direction A. The second spacer wall portion 50b is composed of the second wall portion 512 and the second wall portion 522 overlapping in the first direction A. A third spacer wall portion 50c is composed of a third wall portion 513 and a third wall portion 523 that overlap in the first direction A. The fourth spacer wall portion 50d is composed of the fourth wall portion 514 and the fourth wall portion 524 overlapping in the first direction A.

図３及び図４に示すように、第１構成体５１は、第１方向Ａの両端面のうち、正極集電体２１寄りの一端面に四角枠状の第１端面５１ａを有し、負極集電体３１寄りの他端面に四角枠状の第２端面５１ｂを有している。第２構成体５２は、第１方向Ａの両端面のうち、負極集電体３１寄りの一端面に四角枠状の第１端面５２ａを有し、正極集電体２１寄りの他端面に四角枠状の第２端面５２ｂを有している。 As shown in FIGS. 3 and 4, the first structure 51 has a square frame-shaped first end surface 51a on one end surface near the positive electrode current collector 21 among both end faces in the first direction A, and is a negative electrode. A square frame-shaped second end surface 51b is provided on the other end surface near the current collector 31. The second component 52 has a square frame-shaped first end surface 52a on one end surface near the negative electrode current collector 31 among both end faces in the first direction A, and a square on the other end surface near the positive electrode current collector 21. It has a frame-shaped second end surface 52b.

蓄電セル１０は、第１構成体５１と正極集電体２１とが接合された部位である第１接合部Ｗ１を有している。第１接合部Ｗ１は、第１構成体５１の第１端面５１ａにおける正極集電体２１の外周縁部２１ｄが重なり合う部分が正極集電体２１の外周縁部２１ｄに溶着されて形成されている。矩形枠状の第１構成体５１における第１端面５１ａは、矩形状の正極集電体２１の外周縁部２１ｄの全周に溶着されている。平面視において、第１接合部Ｗ１は、四角枠状をなしている。 The storage cell 10 has a first joint portion W1 which is a portion where the first component 51 and the positive electrode current collector 21 are joined. The first joint portion W1 is formed by welding a portion of the first end surface 51a of the first component 51 where the outer peripheral edge portion 21d of the positive electrode current collector 21 overlaps to the outer peripheral edge portion 21d of the positive electrode current collector 21. .. The first end surface 51a of the rectangular frame-shaped first structure 51 is welded to the entire circumference of the outer peripheral edge portion 21d of the rectangular positive electrode current collector 21. In a plan view, the first joint portion W1 has a square frame shape.

蓄電セル１０は、第２構成体５２と負極集電体３１とが接合された部位である第２接合部Ｗ２を有している。第２接合部Ｗ２は、第２構成体５２の第１端面５２ａにおける負極集電体３１の外周縁部３１ｄが重なり合う部分が負極集電体３１の外周縁部３１ｄに溶着されて形成されている。矩形枠状の第２構成体５２における第１端面５２ａは、矩形状の負極集電体３１の外周縁部３１ｄの全周に溶着されている。平面視において、第２接合部Ｗ２は、四角枠状をなしている。なお、第１接合部Ｗ１及び第２接合部Ｗ２は、同じ溶着面積を有している。 The storage cell 10 has a second joint portion W2 which is a portion where the second component 52 and the negative electrode current collector 31 are joined. The second junction W2 is formed by welding a portion of the first end surface 52a of the second component 52 where the outer peripheral edge portion 31d of the negative electrode current collector 31 overlaps to the outer peripheral edge portion 31d of the negative electrode current collector 31. .. The first end surface 52a of the rectangular frame-shaped second structure 52 is welded to the entire circumference of the outer peripheral edge portion 31d of the rectangular negative electrode current collector 31. In a plan view, the second joint portion W2 has a square frame shape. The first joint portion W1 and the second joint portion W2 have the same welding area.

セパレータ４０の非対向部４１は、第１構成体５１と第２構成体５２とに挟まれている。非対向部４１の外周縁の全周が第１構成体５１と第２構成体５２との間に挟まれている。スペーサ５０には、第１構成体５１と第２構成体５２との間に非対向部４１を挟む部分と、第１構成体５１と第２構成体５２とが互いに溶着された第３接合部Ｗ３とが形成されている。なお、第３接合部Ｗ３が形成される際に、第１構成体５１及び第２構成体５２は、それぞれ、セパレータ４０の非対向部４１にも若干溶着される。 The non-opposing portion 41 of the separator 40 is sandwiched between the first component 51 and the second component 52. The entire circumference of the outer peripheral edge of the non-opposing portion 41 is sandwiched between the first component 51 and the second component 52. The spacer 50 has a portion that sandwiches the non-opposing portion 41 between the first constituent body 51 and the second constituent body 52, and a third joint portion in which the first constituent body 51 and the second constituent body 52 are welded to each other. W3 is formed. When the third joint portion W3 is formed, the first component 51 and the second component 52 are slightly welded to the non-opposing portion 41 of the separator 40, respectively.

第３接合部Ｗ３は、第１構成体５１と第２構成体５２において、正極集電体２１の外周縁部２１ｄと負極集電体３１の外周縁部３１ｄとに挟まれた領域に設けられている。第３接合部Ｗ３は、第２端面５１ｂにおける正極集電体２１の外周縁部２１ｄと負極集電体３１の外周縁部３１ｄに挟まれた領域と、第２端面５２ｂにおける正極集電体２１の外周縁部２１ｄと負極集電体３１の外周縁部３１ｄに挟まれた領域とを全周に亘って溶着することで形成される。なお、蓄電セル１０を単一で見たとき、第１構成体５１の第２端面５１ｂと第２構成体５２の第２端面５２ｂとの間には、第１構成体５１と第２構成体５２とが溶着されない非溶着部が設けられている。非溶着部は、第１構成体５１と第２構成体５２との間において、正極集電体２１の外周縁部２１ｄと負極集電体３１の外周縁部３１ｄとの間に挟まれていない領域に設けられている。 The third junction W3 is provided in a region of the first component 51 and the second component 52 sandwiched between the outer peripheral edge portion 21d of the positive electrode current collector 21 and the outer peripheral edge portion 31d of the negative electrode current collector 31. ing. The third junction W3 has a region sandwiched between the outer peripheral edge portion 21d of the positive electrode current collector 21 on the second end surface 51b and the outer peripheral edge portion 31d of the negative electrode current collector 31, and the positive electrode current collector 21 on the second end surface 52b. It is formed by welding the outer peripheral edge portion 21d of the above and the region sandwiched between the outer peripheral edge portion 31d of the negative electrode current collector 31 over the entire circumference. When the storage cell 10 is viewed as a single unit, the first component 51 and the second component are located between the second end surface 51b of the first component 51 and the second end surface 52b of the second component 52. A non-welded portion is provided in which the 52 is not welded. The non-welded portion is not sandwiched between the first component 51 and the second component 52 between the outer peripheral edge portion 21d of the positive electrode current collector 21 and the outer peripheral edge portion 31d of the negative electrode current collector 31. It is provided in the area.

蓄電セル１０の内部には、正極集電体２１、負極集電体３１、及びスペーサ５０により区画された空間Ｓが形成されている。空間Ｓは、セパレータ４０により正極活物質層２２が位置する第１空間Ｓ１と、負極活物質層３２が位置する第２空間Ｓ２とに区画されている。第１空間Ｓ１と第２空間Ｓ２とは、第１方向Ａにおいてセパレータ４０を介して隣り合っている。第１空間Ｓ１は、正極集電体２１の第１面２１ａと、セパレータ４０の下面４０ａと、第１構成体５１の内面とによって区画されている。第１空間Ｓ１は、第１方向Ａにおいてセパレータ４０よりも正極集電体２１寄りに位置している。第２空間Ｓ２は、負極集電体３１の第１面３１ａと、セパレータ４０の上面４０ｂと、第２構成体５２の内面とによって区画されている。第２空間Ｓ２は、第１方向Ａにおいてセパレータ４０よりも負極集電体３１寄りに位置している。第１接合部Ｗ１、第２接合部Ｗ２、及び第３接合部Ｗ３により蓄電セル１０の正極集電体２１、負極集電体３１、及びスペーサ５０により区画される空間Ｓのシール性が保たれる。 Inside the storage cell 10, a space S partitioned by a positive electrode current collector 21, a negative electrode current collector 31, and a spacer 50 is formed. The space S is divided into a first space S1 in which the positive electrode active material layer 22 is located and a second space S2 in which the negative electrode active material layer 32 is located by the separator 40. The first space S1 and the second space S2 are adjacent to each other via the separator 40 in the first direction A. The first space S1 is partitioned by a first surface 21a of the positive electrode current collector 21, a lower surface 40a of the separator 40, and an inner surface of the first component 51. The first space S1 is located closer to the positive electrode current collector 21 than the separator 40 in the first direction A. The second space S2 is partitioned by a first surface 31a of the negative electrode current collector 31, an upper surface 40b of the separator 40, and an inner surface of the second component 52. The second space S2 is located closer to the negative electrode current collector 31 than the separator 40 in the first direction A. The sealability of the space S partitioned by the positive electrode current collector 21, the negative electrode current collector 31, and the spacer 50 of the storage cell 10 was maintained by the first joint portion W1, the second joint portion W2, and the third joint portion W3. Is done.

図１に示すように、セルスタック２において、複数の蓄電セル１０は、積層方向Ｃに隣り合う一方の蓄電セル１０の正極集電体２１の第２面２１ｂと、他方の蓄電セル１０の負極集電体３１の第２面３１ｂとが互いに接するようにスタックされている。複数の蓄電セル１０は電気的に直列に接続される。セルスタック２では、積層方向Ｃに隣り合う蓄電セル１０により互いに接する正極集電体２１及び負極集電体３１を電極体とする疑似的なバイポーラ電極１３が形成される。１つのバイポーラ電極１３は、正極集電体２１、負極集電体３１、正極活物質層２２、及び負極活物質層３２を含む。なお、複数の蓄電セル１０が備えるスペーサ５０において、正極集電体２１の外周縁２１ｃ及び負極集電体３１の外周縁３１ｃよりも外側に位置する部分は、互いに接合されて一体化している。これにより、蓄電装置１として、バイポーラ電極１３を構成している正極集電体２１と負極集電体３１との間のシール性が確保される。なお、蓄電セル１０を単一で見たときに設けられていた非溶着部の構成は、隣り合うスペーサ５０同士が互いに接合されて一体化したときに無くなる。 As shown in FIG. 1, in the cell stack 2, the plurality of storage cells 10 are the second surface 21b of the positive electrode current collector 21 of one storage cell 10 adjacent to each other in the stacking direction C, and the negative electrode of the other storage cell 10. The second surface 31b of the current collector 31 is stacked so as to be in contact with each other. The plurality of storage cells 10 are electrically connected in series. In the cell stack 2, a pseudo bipolar electrode 13 having a positive electrode current collector 21 and a negative electrode current collector 31 in contact with each other is formed by storage cells 10 adjacent to each other in the stacking direction C. One bipolar electrode 13 includes a positive electrode current collector 21, a negative electrode current collector 31, a positive electrode active material layer 22, and a negative electrode active material layer 32. In the spacer 50 included in the plurality of storage cells 10, the portions located outside the outer peripheral edge 21c of the positive electrode current collector 21 and the outer peripheral edge 31c of the negative electrode current collector 31 are joined to each other and integrated. As a result, as the power storage device 1, the sealing property between the positive electrode current collector 21 and the negative electrode current collector 31 constituting the bipolar electrode 13 is ensured. It should be noted that the configuration of the non-welded portion provided when the storage cell 10 is viewed as a single unit disappears when the adjacent spacers 50 are joined to each other and integrated.

セルスタック２における積層方向Ｃの第１端部１１には、終端電極として正極集電体２１と正極活物質層２２が配置される。蓄電装置１における積層方向Ｃの第２端部１２には、終端電極として負極集電体３１と負極活物質層３２が配置される。 A positive electrode current collector 21 and a positive electrode active material layer 22 are arranged as terminal electrodes at the first end 11 in the stacking direction C in the cell stack 2. A negative electrode current collector 31 and a negative electrode active material layer 32 are arranged as terminal electrodes at the second end 12 of the stacking direction C in the power storage device 1.

蓄電装置１は、積層方向Ｃにおいてセルスタック２を挟むように配置された、正極通電板７０及び負極通電板８０からなる一対の通電体を備えている。正極通電板７０及び負極通電板８０は、それぞれ良導電性材料で構成される。正極通電板７０は、第１端部１１において最も外側に配置された正極集電体２１に電気的に接続されている。負極通電板８０は、第２端部１２において最も外側に配置された負極集電体３１に電気的に接続されている。正極通電板７０及び負極通電板８０に設けられた図示しない端子を通じて蓄電装置１の充放電が行われる。正極通電板７０及び負極通電板８０を構成する材料としては、正極集電体２１及び負極集電体３１を構成する材料と同じ材料を用いることができる。正極通電板７０及び負極通電板８０は、蓄電セル１０に用いられた正極集電体２１及び負極集電体３１よりも厚い金属板で構成してもよい。 The power storage device 1 includes a pair of energizing bodies composed of a positive electrode energizing plate 70 and a negative electrode energizing plate 80 arranged so as to sandwich the cell stack 2 in the stacking direction C. The positive electrode current-carrying plate 70 and the negative electrode current-carrying plate 80 are each made of a good conductive material. The positive electrode current-carrying plate 70 is electrically connected to the positive electrode current collector 21 arranged on the outermost side of the first end portion 11. The negative electrode current-carrying plate 80 is electrically connected to the negative electrode current collector 31 arranged on the outermost side of the second end portion 12. The power storage device 1 is charged and discharged through terminals (not shown) provided on the positive electrode energizing plate 70 and the negative electrode energizing plate 80. As the material constituting the positive electrode current collecting plate 70 and the negative electrode current collecting plate 80, the same materials as those constituting the positive electrode current collector 21 and the negative electrode current collector 31 can be used. The positive electrode energizing plate 70 and the negative electrode energizing plate 80 may be made of a metal plate thicker than the positive electrode current collector 21 and the negative electrode current collector 31 used in the storage cell 10.

正極集電体２１及び負極集電体３１は、化学的に不活性な電気伝導体である。正極集電体２１及び負極集電体３１を構成する材料としては、例えば、金属材料、導電性樹脂材料、導電性無機材料等を用いることができる。導電性樹脂材料としては、例えば、導電性高分子材料又は非導電性高分子材料に必要に応じて導電性フィラーが添加された樹脂等が挙げられる。正極集電体２１及び負極集電体３１は、前述した金属材料又は導電性樹脂材料を含む１以上の層を含む複数層を備えてもよい。正極集電体２１及び負極集電体３１の表面には、メッキ処理又はスプレーコート等の公知の方法により被覆層を形成してもよい。正極集電体２１及び負極集電体３１は、例えば、板状、箔状、シート状、フィルム状、メッシュ状等の形態に形成されていてもよい。正極集電体２１及び負極集電体３１を金属箔とする場合、例えば、アルミニウム箔、銅箔、ニッケル箔、チタン箔、又はステンレス鋼箔等を用いることができる。正極集電体２１及び負極集電体３１として、アルミニウム箔、銅箔、又はステンレス鋼箔を用いた場合、正極集電体２１及び負極集電体３１の機械的強度を確保できる。正極集電体２１及び負極集電体３１は、上記金属箔の合金からなる箔又は異種金属を接合したクラッド材からなる箔であってもよい。本実施形態において、正極集電体２１はアルミニウム箔であり、負極集電体３１は銅箔である。正極集電体２１及び負極集電体３１は、箔状である場合、厚みを例えば、１μｍ～１００μｍとすればよい。 The positive electrode current collector 21 and the negative electrode current collector 31 are chemically inert electric conductors. As the material constituting the positive electrode current collector 21 and the negative electrode current collector 31, for example, a metal material, a conductive resin material, a conductive inorganic material, or the like can be used. Examples of the conductive resin material include a conductive polymer material and a resin obtained by adding a conductive filler to a non-conductive polymer material as needed. The positive electrode current collector 21 and the negative electrode current collector 31 may include a plurality of layers including one or more layers including the above-mentioned metal material or conductive resin material. A coating layer may be formed on the surfaces of the positive electrode current collector 21 and the negative electrode current collector 31 by a known method such as plating treatment or spray coating. The positive electrode current collector 21 and the negative electrode current collector 31 may be formed in, for example, a plate shape, a foil shape, a sheet shape, a film shape, a mesh shape, or the like. When the positive electrode current collector 21 and the negative electrode current collector 31 are metal foils, for example, aluminum foil, copper foil, nickel foil, titanium foil, stainless steel foil, or the like can be used. When aluminum foil, copper foil, or stainless steel foil is used as the positive electrode current collector 21 and the negative electrode current collector 31, the mechanical strength of the positive electrode current collector 21 and the negative electrode current collector 31 can be ensured. The positive electrode current collector 21 and the negative electrode current collector 31 may be a foil made of an alloy of the above metal foils or a foil made of a clad material bonded with dissimilar metals. In the present embodiment, the positive electrode current collector 21 is an aluminum foil and the negative electrode current collector 31 is a copper foil. When the positive electrode current collector 21 and the negative electrode current collector 31 are foil-shaped, the thickness may be, for example, 1 μm to 100 μm.

正極活物質層２２は、リチウムイオン等の電荷担体を吸蔵及び放出し得る正極活物質を含む、正極活物質としては、例えば、層状岩塩構造を有するリチウムイオン複合金属酸化物、スピネル構造の金属酸化物、ポリアニオン系化合物など、リチウムイオン二次電池の正極活物質として使用可能なものを採用すればよい。また、２種以上の正極活物質を併用してもよい。本実施形態において、正極活物質層２２は、複合活物質としてのオリビン型リン酸鉄リチウム（ＬｉＦｅＰＯ４）を含む。 The positive electrode active material layer 22 contains a positive electrode active material capable of storing and releasing a charge carrier such as lithium ions, and examples of the positive electrode active material include a lithium ion composite metal oxide having a layered rock salt structure and metal oxidation of a spinel structure. A material, a polyanionic compound, or the like that can be used as a positive electrode active material for a lithium ion secondary battery may be used. Further, two or more kinds of positive electrode active materials may be used in combination. In the present embodiment, the positive electrode active material layer 22 contains olivine-type lithium iron phosphate (LiFePO 4 ) as a composite active material.

負極活物質層３２は、リチウムイオン等の電荷担体を吸蔵及び放出可能である単体、合金、又は、化合物であれば、特に限定はなく使用可能である。例えば、負極活物質としては、リチウム、炭素、金属化合物、及びリチウムと合金化可能な元素もしくはその化合物等が挙げられる。炭素としては天然黒鉛、人造黒鉛、あるいはハードカーボン（難黒鉛化性炭素）及びソフトカーボン（易黒鉛化性炭素）等が挙げられる。人造黒鉛としては、高配向性グラファイト、メソカーボンマイクロビーズ等が挙げられる。リチウムと合金化可能な元素の例としては、例えば、シリコン（ケイ素）やスズ等が挙げられる。本実施形態において、負極活物質層３２は炭素系材料としての黒鉛を含む。 The negative electrode active material layer 32 can be used without particular limitation as long as it is a simple substance, an alloy, or a compound capable of occluding and releasing charge carriers such as lithium ions. For example, examples of the negative electrode active material include lithium, carbon, a metal compound, and an element or a compound thereof that can be alloyed with lithium. Examples of carbon include natural graphite, artificial graphite, hard carbon (non-graphitizable carbon) and soft carbon (easy graphitizable carbon). Examples of artificial graphite include highly oriented graphite and mesocarbon microbeads. Examples of elements that can be alloyed with lithium include, for example, silicon and tin. In the present embodiment, the negative electrode active material layer 32 contains graphite as a carbon-based material.

正極活物質層２２及び負極活物質層３２のそれぞれは、必要に応じて電気伝導性を高めるための導電助剤、結着剤、電解質（ポリマーマトリクス、イオン伝導性ポリマー、電解液等）、イオン伝導性を高めるための電解質支持塩（リチウム塩）等をさらに含み得る。活物質層に含まれる成分又は成分の配合比及び活物質層の厚さは特に限定されず、リチウムイオン二次電池についての公知の知見が適宜参照され得る。活物質層の厚みは、例えば２μｍ～１５０μｍである。正極集電体２１及び負極集電体３１の表面に活物質層を形成させるために、ロールコート法等の公知の方法を用いてもよい。正極２０又は負極３０の熱安定性を向上させるために、正極集電体２１及び負極集電体３１の表面（片面又は両面）又は正極活物質層２２及び負極活物質層３２の表面に耐熱層を設けてもよい。耐熱層は、例えば、無機粒子と結着剤とを含み、その他に増粘剤等の添加剤を含んでもよい。 Each of the positive electrode active material layer 22 and the negative electrode active material layer 32 is a conductive auxiliary agent, a binder, an electrolyte (polymer matrix, ionic conductive polymer, electrolytic solution, etc.) and ions for increasing electrical conductivity as needed. It may further contain an electrolyte-supporting salt (lithium salt) or the like for enhancing conductivity. The components contained in the active material layer or the compounding ratio of the components and the thickness of the active material layer are not particularly limited, and known knowledge about the lithium ion secondary battery can be appropriately referred to. The thickness of the active material layer is, for example, 2 μm to 150 μm. In order to form an active material layer on the surfaces of the positive electrode current collector 21 and the negative electrode current collector 31, a known method such as a roll coating method may be used. In order to improve the thermal stability of the positive electrode 20 or the negative electrode 30, a heat resistant layer is formed on the surface (one side or both sides) of the positive electrode current collector 21 and the negative electrode current collector 31 or on the surface of the positive electrode active material layer 22 and the negative electrode active material layer 32. May be provided. The heat-resistant layer may contain, for example, inorganic particles and a binder, and may also contain an additive such as a thickener.

導電助剤は、例えば、アセチレンブラック、カーボンブラック、グラファイト等である。結着剤としては、ポリフッ化ビニリデン、ポリテトラフルオロエチレン、フッ化ゴム等の含フッ素樹脂、ポリプロピレン、ポリエチレン等の熱可塑性樹脂、ポリイミド、ポリアミド等のイミド系樹脂、アルコキシシリル基含有樹脂、ポリアクリル酸やポリメタクリル酸等のアクリル系樹脂、スチレン－ブタジエンゴム（ＳＢＲ）、カルボキシメチルセルロース（ＣＭＣ）、アルギン酸ナトリウム、アルギン酸アンモニウム等のアルギン酸塩、水溶性セルロースエステル架橋体、デンプン－アクリル酸グラフト重合体が挙げられる。これらの結着剤は、単独で又は複数で用いられ得る。溶媒としては、例えば、水、Ｎ－メチル－２－ピロドリン（ＮＭＰ）等が用いられる。 The conductive auxiliary agent is, for example, acetylene black, carbon black, graphite or the like. Examples of the binder include fluororesins such as polyvinylidene fluoride, polytetrafluoroethylene and rubber fluoride, thermoplastic resins such as polypropylene and polyethylene, imide-based resins such as polyimide and polyamide, resins containing an alkoxysilyl group, and polyacrylics. Acrylic resins such as acid and polymethacrylic acid, styrene-butadiene rubber (SBR), carboxymethyl cellulose (CMC), sodium alginate, arginate such as ammonium alginate, water-soluble cellulose ester cross-linking material, starch-acrylic acid graft polymer Can be mentioned. These binders can be used alone or in combination. As the solvent, for example, water, N-methyl-2-pyrodrin (NMP) and the like are used.

セパレータ４０は、正極２０と負極３０とを隔離することで両極の接触による短絡を防止しつつ、リチウムイオン等の電荷担体を通過させる。セパレータ４０は、例えば、電解質を吸収保持するポリマーを含む多孔性シート又は不織布であってもよい。セパレータ４０を構成する材料としては、例えば、ポリプロピレン、ポリエチレン、ポリオレフィン、ポリエステル等が挙げられる。セパレータ４０は、単層構造又は多層構造を有してもよい。多層構造は、例えば、接着層、耐熱層としてのセラミック層等を有してもよい。セパレータ４０自体を高分子ゲル電解質又は電解質等の電解質で構成してもよい。セパレータ４０は、電解質を保持する機能を有している。 The separator 40 allows a charge carrier such as lithium ion to pass through while separating the positive electrode 20 and the negative electrode 30 to prevent a short circuit due to contact between the two electrodes. The separator 40 may be, for example, a porous sheet or a non-woven fabric containing a polymer that absorbs and retains an electrolyte. Examples of the material constituting the separator 40 include polypropylene, polyethylene, polyolefin, polyester and the like. The separator 40 may have a single-layer structure or a multi-layer structure. The multilayer structure may have, for example, an adhesive layer, a ceramic layer as a heat-resistant layer, and the like. The separator 40 itself may be composed of a polymer gel electrolyte or an electrolyte such as an electrolyte. The separator 40 has a function of retaining an electrolyte.

セパレータ４０に含浸される電解質としては、例えば、非水溶媒と非水溶媒に溶解した電解質塩とを含む液体電解質（電解液）、又はポリマーマトリックス中に保持された電解質を含む高分子ゲル電解質等の流動性を有する電解質が挙げられる。 Examples of the electrolyte impregnated in the separator 40 include a liquid electrolyte (electrolyte solution) containing a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent, a polymer gel electrolyte containing an electrolyte held in a polymer matrix, and the like. Examples thereof include an electrolyte having the fluidity of.

セパレータ４０に電解液が含浸される場合、その電解質塩として、ＬｉＣｌＯ４、ＬｉＡｓＦ６、ＬｉＰＦ６、ＬｉＢＦ４、ＬｉＣＦ３ＳＯ３、ＬｉＮ（ＦＳＯ２）２、ＬｉＮ（ＣＦ３ＳＯ２）２、等の公知のリチウム塩を使用できる。また、非水溶媒として、環状カーボネート類、環状エステル類、鎖状カーボネート類、鎖状エステル類、エーテル類等の公知の溶媒を使用できる。なお、これら公知の溶媒材料を二種以上組み合わせて用いてもよい。 When the separator 40 is impregnated with an electrolytic solution, the electrolyte salts thereof include LiClO 4 , LiAsF 6, LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN (FSO 2 ) 2 , LiN (CF 3 SO 2 ) 2 , etc. Known lithium salts can be used. Further, as the non-aqueous solvent, known solvents such as cyclic carbonates, cyclic esters, chain carbonates, chain esters, ethers and the like can be used. In addition, you may use two or more kinds of these known solvent materials in combination.

図２、図３、及び図４に示すように、蓄電セル１０は、第１貫通部６１と、第２貫通部６２と、第１閉塞部７１と、第２閉塞部７２とを備えている。
図２及び図４に示すように、第１貫通部６１は、第１構成体５１に設けられている。第１貫通部６１は、第１構成体５１の第１壁部５１１を貫通する貫通孔である。第１貫通部６１は、第１壁部５１１を第１延設方向Ｄ１及び第１方向Ａに直交する方向に貫通している。第１貫通部６１は、第１壁部５１１を第２延設方向Ｄ２及び第３延設方向Ｄ３に貫通している。第１貫通部６１は、第１構成体５１における第１空間Ｓ１と蓄電セル１０の外部との間を第２方向Ｂに延びている。 As shown in FIGS. 2, 3, and 4, the storage cell 10 includes a first penetration portion 61, a second penetration portion 62, a first closing portion 71, and a second closing portion 72. ..
As shown in FIGS. 2 and 4, the first penetration portion 61 is provided in the first structure 51. The first penetration portion 61 is a through hole that penetrates the first wall portion 511 of the first component 51. The first penetrating portion 61 penetrates the first wall portion 511 in a direction orthogonal to the first extending direction D1 and the first direction A. The first penetrating portion 61 penetrates the first wall portion 511 in the second extending direction D2 and the third extending direction D3. The first penetrating portion 61 extends in the second direction B between the first space S1 in the first configuration 51 and the outside of the storage cell 10.

第１貫通部６１を第１延設方向Ｄ１及び第１方向Ａに延びる仮想面で切断したときの断面は、矩形状をなしている。第１貫通部６１は、第１延設方向Ｄ１において、第１壁部５１１の中間よりも第２壁部５１２寄りに設けられている。第１貫通部６１は、蓄電セル１０の空間Ｓに電解質を注入するために設けられた注入口としての機能を有している。また、第１貫通部６１は、蓄電セル１０の空間Ｓに電解質を注入した後、蓄電セル１０の内部に発生するガスを蓄電セル１０の外部に排出するガス排出口としての機能も有している。蓄電セル１０の内部に発生するガスとしては、蓄電セル１０の内部に電解質を注入する前に残存していた空気や、蓄電装置１の初期充放電時に発生するガスを示している。第１貫通部６１を第１延設方向Ｄ１及び第１方向Ａに延びる仮想面で切断したときの断面は、矩形状に限らず、円形状をなしていてもよい。第１貫通部６１の形状は、適宜変更してもよい。 The cross section when the first penetrating portion 61 is cut by the virtual surface extending in the first extending direction D1 and the first direction A has a rectangular shape. The first penetrating portion 61 is provided closer to the second wall portion 512 than in the middle of the first wall portion 511 in the first extension direction D1. The first penetrating portion 61 has a function as an injection port provided for injecting an electrolyte into the space S of the storage cell 10. Further, the first penetration portion 61 also has a function as a gas discharge port for injecting an electrolyte into the space S of the storage cell 10 and then discharging the gas generated inside the storage cell 10 to the outside of the storage cell 10. There is. As the gas generated inside the storage cell 10, the air remaining before the electrolyte is injected into the storage cell 10 and the gas generated during the initial charge / discharge of the power storage device 1 are shown. The cross section when the first penetrating portion 61 is cut by the virtual surface extending in the first extending direction D1 and the first direction A is not limited to a rectangular shape, but may be a circular shape. The shape of the first penetrating portion 61 may be changed as appropriate.

第１閉塞部７１は、樹脂部材である。第１閉塞部７１は、第１貫通部６１を閉塞している。第１閉塞部７１は、蓄電セル１０の内部に注入された電解質が蓄電セル１０の外部に漏れ出すことを防止する。電解質は、第１閉塞部７１により第１貫通部６１を閉塞する前の状態において蓄電セル１０の空間Ｓに注入される。また、蓄電セル１０の内部に発生したガスは、第１閉塞部７１により第１貫通部６１を閉塞する前の状態において蓄電セル１０の外部に排出される。 The first closing portion 71 is a resin member. The first closed portion 71 closes the first penetrating portion 61. The first closing portion 71 prevents the electrolyte injected into the storage cell 10 from leaking to the outside of the storage cell 10. The electrolyte is injected into the space S of the storage cell 10 in a state before the first penetrating portion 61 is closed by the first closing portion 71. Further, the gas generated inside the storage cell 10 is discharged to the outside of the storage cell 10 in a state before the first penetrating portion 61 is closed by the first blocking portion 71.

図２及び図３に示すように、第２貫通部６２は、第２構成体５２に設けられている。第２貫通部６２は、第２構成体５２の第１壁部５２１を貫通する貫通孔である。第２貫通部６２は、第１壁部５２１を第１延設方向Ｄ１及び第１方向Ａに直交する方向に貫通している。第２貫通部６２は、第１壁部５２１を第２延設方向Ｄ２及び第３延設方向Ｄ３に貫通している。第２貫通部６２は、第２構成体５２における第２空間Ｓ２と蓄電セル１０の外部との間を第２方向Ｂに延びている。 As shown in FIGS. 2 and 3, the second penetration portion 62 is provided in the second structure 52. The second penetration portion 62 is a through hole that penetrates the first wall portion 521 of the second structure 52. The second penetrating portion 62 penetrates the first wall portion 521 in a direction orthogonal to the first extending direction D1 and the first direction A. The second penetrating portion 62 penetrates the first wall portion 521 in the second extending direction D2 and the third extending direction D3. The second penetrating portion 62 extends in the second direction B between the second space S2 in the second structure 52 and the outside of the storage cell 10.

第２貫通部６２を第１延設方向Ｄ１及び第１方向Ａに延びる仮想面で切断したときの断面は、矩形状をなしている。第２貫通部６２は、第１延設方向Ｄ１において、第１壁部５２１の中央よりも第３壁部５２３寄りに設けられている。第２貫通部６２は、蓄電セル１０の空間Ｓに電解質を注入するために設けられた注入口としての機能を有している。また、第２貫通部６２は、蓄電セル１０の空間Ｓに電解質を注入した後、蓄電セル１０の内部に発生するガスを蓄電セル１０の外部に排出するガス排出口としての機能も有している。第２貫通部６２を第１延設方向Ｄ１及び第１方向Ａに延びる仮想面で切断したときの断面は、矩形状に限らず、円形状をなしていてもよい。第２貫通部６２の形状は、適宜変更してもよい。 The cross section of the second penetrating portion 62 when cut by the virtual surface extending in the first extending direction D1 and the first direction A has a rectangular shape. The second penetrating portion 62 is provided closer to the third wall portion 523 than the center of the first wall portion 521 in the first extension direction D1. The second penetrating portion 62 has a function as an injection port provided for injecting an electrolyte into the space S of the storage cell 10. Further, the second penetrating portion 62 also has a function as a gas discharge port for injecting an electrolyte into the space S of the storage cell 10 and then discharging the gas generated inside the storage cell 10 to the outside of the storage cell 10. There is. The cross section when the second penetrating portion 62 is cut by the virtual surface extending in the first extending direction D1 and the first direction A is not limited to a rectangular shape, but may be a circular shape. The shape of the second penetrating portion 62 may be changed as appropriate.

第２閉塞部７２は、樹脂部材である。第２閉塞部７２は、第２貫通部６２における正極集電体２１の外周縁部２１ｄと負極集電体３１の外周縁部３１ｄとの間に挟まれていない部分を閉塞している。第２閉塞部７２は、蓄電セル１０の外部に臨んでいる。なお、第２閉塞部７２は、蓄電セル１０の内部に注入された電解質が蓄電セル１０の外部に漏れ出すことを防止する封止部材である。そのため、電解質は、第２閉塞部７２により第２貫通部６２を閉塞する前の状態において蓄電セル１０の空間Ｓに注入される。また、蓄電セル１０の内部に発生したガスは、第２閉塞部７２により第２貫通部６２を閉塞する前の状態において蓄電セル１０の外部に排出される。 The second closing portion 72 is a resin member. The second closed portion 72 closes a portion of the second penetrating portion 62 that is not sandwiched between the outer peripheral edge portion 21d of the positive electrode current collector 21 and the outer peripheral edge portion 31d of the negative electrode current collector 31. The second closed portion 72 faces the outside of the storage cell 10. The second closing portion 72 is a sealing member that prevents the electrolyte injected into the storage cell 10 from leaking to the outside of the storage cell 10. Therefore, the electrolyte is injected into the space S of the storage cell 10 in a state before the second penetrating portion 62 is closed by the second closing portion 72. Further, the gas generated inside the storage cell 10 is discharged to the outside of the storage cell 10 in a state before the second penetrating portion 62 is closed by the second closing portion 72.

第１の実施形態の作用を説明する。
第１閉塞部７１により第１貫通部６１が閉塞される前、且つ第２閉塞部７２により第２貫通部６２が閉塞される前の状態において、第１貫通部６１を介して第１空間Ｓ１に電解質を注入でき、且つ第２貫通部６２を介して第２空間Ｓ２に電解質を注入できる。 The operation of the first embodiment will be described.
In a state before the first penetrating portion 61 is closed by the first closing portion 71 and before the second penetrating portion 62 is closed by the second closing portion 72, the first space S1 is passed through the first penetrating portion 61. The electrolyte can be injected into the second space S2 via the second penetration portion 62.

第１の実施形態では、例えば、図２の二点鎖線で示すように、蓄電セル１０に電解質を注入する場合、第１貫通部６１に接続され、且つ第１貫通部６１から蓄電セル１０に電解質を注入する第１設備Ｆ１と、第２貫通部６２に接続され、且つ第２貫通部６２から蓄電セル１０に電解質を注入する第２設備Ｆ２とを採用する。第１設備Ｆ１及び第２設備Ｆ２には、流動性を有する電解質が充填され、且つ充填された電解質を放出できる装置である。第１設備Ｆ１と第２設備Ｆ２とは、蓄電セル１０における第１延設方向Ｄ１において間隔をおいて配置される。なお、第１設備Ｆ１と第１貫通部６１とを接続する際に、第１設備Ｆ１と第１構成体５１の第１壁部５１１との間には、図示しないパッキンが設けられる。第２設備Ｆ２と第２貫通部６２とを接続する際に、第２設備Ｆ２と第２構成体５２の第１壁部５２１との間には、図示しないパッキンが設けられる。上記のパッキンは、第１設備Ｆ１及び第２設備Ｆ２から放出される電解質が、蓄電セル１０の外部に漏れ出すことを防止するシール部材である。 In the first embodiment, for example, as shown by the alternate long and short dash line in FIG. 2, when the electrolyte is injected into the storage cell 10, it is connected to the first penetration portion 61 and is connected to the storage cell 10 from the first penetration portion 61. The first equipment F1 for injecting the electrolyte and the second equipment F2 connected to the second penetrating portion 62 and injecting the electrolyte into the storage cell 10 from the second penetrating portion 62 are adopted. The first equipment F1 and the second equipment F2 are filled with an electrolyte having fluidity, and are devices capable of discharging the filled electrolyte. The first equipment F1 and the second equipment F2 are arranged at intervals in the first extension direction D1 in the power storage cell 10. When connecting the first equipment F1 and the first penetrating portion 61, a packing (not shown) is provided between the first equipment F1 and the first wall portion 511 of the first component 51. When connecting the second equipment F2 and the second penetrating portion 62, a packing (not shown) is provided between the second equipment F2 and the first wall portion 521 of the second structure 52. The packing is a sealing member that prevents the electrolytes released from the first equipment F1 and the second equipment F2 from leaking to the outside of the storage cell 10.

第１貫通部６１を介して第１空間Ｓ１に注入された電解質を正極活物質層２２に含浸させる。これと同時に、第２貫通部６２を介して第２空間Ｓ２に注入された電解質を負極活物質層３２に含浸させる。また、セパレータ４０には、第１空間Ｓ１と第２空間Ｓ２の双方に注入された電解質を含浸させる。このため、電解質を注入するための貫通部がスペーサ５０に１つだけ設けられ、当該貫通部が第１空間Ｓ１と蓄電セル１０の外部との間に延びている場合、又は当該貫通部が第２空間Ｓ２と蓄電セル１０の外部との間に延びている場合に比べて、正極活物質層２２、負極活物質層３２、及びセパレータ４０に電解質が含浸されるまでの時間が短くなる。 The positive electrode active material layer 22 is impregnated with the electrolyte injected into the first space S1 via the first penetrating portion 61. At the same time, the negative electrode active material layer 32 is impregnated with the electrolyte injected into the second space S2 via the second penetrating portion 62. Further, the separator 40 is impregnated with the electrolyte injected into both the first space S1 and the second space S2. Therefore, when only one penetrating portion for injecting the electrolyte is provided in the spacer 50 and the penetrating portion extends between the first space S1 and the outside of the storage cell 10, the penetrating portion is the first. The time required for the positive electrode active material layer 22, the negative electrode active material layer 32, and the separator 40 to be impregnated with the electrolyte is shorter than in the case of extending between the two spaces S2 and the outside of the storage cell 10.

また、蓄電セル１０に電解質を含浸させるために、蓄電セル１０の空間Ｓに許容量を上回る電解質を注入した後、蓄電セル１０に注入した余剰分の電解質を蓄電セル１０の外部に排出する液抜き工程を実施することがある。第１の実施形態のように、セパレータ４０が空間Ｓを第１空間Ｓ１と第２空間Ｓ２とに区画している状態において、仮にスペーサ５０に第１貫通部６１のみが設けられている場合を考える。この場合、液抜き工程において、第２空間Ｓ２に注入された余剰分の電解質を第１貫通部６１から排出しようとしても、セパレータ４０が干渉して液抜きに時間がかかる。その点、第１の実施形態では、スペーサ５０には、第１貫通部６１及び第２貫通部６２が設けられている。よって、液抜き工程を実施するときに第１空間Ｓ１に注入された余剰分の電解質は、第１貫通部６１を介して蓄電セル１０の外部に誘導され易くなり、且つ第２空間Ｓ２に注入された余剰分の電解質は、第２貫通部６２から蓄電セル１０の外部に誘導され易くなる。 Further, in order to impregnate the storage cell 10 with the electrolyte, a liquid in which an electrolyte exceeding an allowable amount is injected into the space S of the storage cell 10 and then the surplus electrolyte injected into the storage cell 10 is discharged to the outside of the storage cell 10. A punching process may be carried out. As in the first embodiment, in a state where the separator 40 divides the space S into the first space S1 and the second space S2, if the spacer 50 is provided with only the first penetration portion 61. think. In this case, even if the surplus electrolyte injected into the second space S2 is to be discharged from the first penetrating portion 61 in the liquid draining step, the separator 40 interferes and it takes time to drain the liquid. In that respect, in the first embodiment, the spacer 50 is provided with the first penetrating portion 61 and the second penetrating portion 62. Therefore, the excess electrolyte injected into the first space S1 when the liquid draining step is carried out is likely to be guided to the outside of the storage cell 10 via the first penetrating portion 61, and is injected into the second space S2. The surplus electrolyte is easily guided to the outside of the storage cell 10 from the second penetrating portion 62.

第１の実施形態の効果を説明する。
（１－１）第１の実施形態の蓄電セル１０及び蓄電装置１において、第１貫通部６１を介して第１空間Ｓ１に電解質を注入でき、且つ第２貫通部６２を介して第２空間Ｓ２に電解質を注入できる。したがって、蓄電セル１０及び蓄電装置１に対する電解質の含浸時間を短縮できる。 The effect of the first embodiment will be described.
(1-1) In the power storage cell 10 and the power storage device 1 of the first embodiment, the electrolyte can be injected into the first space S1 via the first penetration portion 61, and the second space can be injected via the second penetration portion 62. An electrolyte can be injected into S2. Therefore, the impregnation time of the electrolyte for the power storage cell 10 and the power storage device 1 can be shortened.

（１－２）蓄電セル１０及び蓄電装置１において、第１貫通部６１及び第２貫通部６２により液抜き工程を迅速に実施できる。そのため、蓄電セル１０及び蓄電装置１に対する電解質の含浸時間をより短縮できる。よって、蓄電セル１０及び蓄電装置１の製造にかかる時間をより短縮できる。 (1-2) In the power storage cell 10 and the power storage device 1, the liquid draining step can be quickly performed by the first penetration portion 61 and the second penetration portion 62. Therefore, the impregnation time of the electrolyte for the power storage cell 10 and the power storage device 1 can be further shortened. Therefore, the time required for manufacturing the power storage cell 10 and the power storage device 1 can be further shortened.

（１－３）第１貫通部６１と第２貫通部６２とが第１方向Ａで重ならないため、第１貫通部６１に接続される第１設備Ｆ１と、第２貫通部６２に接続される第２設備Ｆ２との干渉を避けることができる。 (1-3) Since the first penetration portion 61 and the second penetration portion 62 do not overlap in the first direction A, they are connected to the first equipment F1 connected to the first penetration portion 61 and the second penetration portion 62. It is possible to avoid interference with the second equipment F2.

（１－４）仮に、第１貫通部６１と第２貫通部６２とが第１方向Ａで重なるように配置されている場合を考える。この場合、第１貫通部６１と第２貫通部６２との第１方向Ａにおける距離が近いと、第１設備Ｆ１と第１構成体５１との間に配置されるパッキンと、第２設備Ｆ２と第２構成体５２との間に配置されるパッキンとが干渉する虞があり、２つのパッキンの配置が困難になる。 (1-4) Consider a case where the first penetrating portion 61 and the second penetrating portion 62 are arranged so as to overlap each other in the first direction A. In this case, when the distance between the first penetration portion 61 and the second penetration portion 62 in the first direction A is short, the packing arranged between the first equipment F1 and the first component 51 and the second equipment F2 There is a possibility that the packing arranged between the second packing and the second structure 52 interferes with each other, which makes it difficult to arrange the two packings.

その点、第１の実施形態では、第１貫通部６１と第２貫通部６２とが第１方向Ａで重ならず、且つ第１設備Ｆ１と第２設備Ｆ２とが第１延設方向Ｄ１において間隔を隔てて配置されている。そのため、２つのパッキンが互いに干渉することなく、第１設備Ｆ１と第１構成体５１との間のシール性、及び第２設備Ｆ２と第２構成体５２との間のシール性を保つことができる。 In that respect, in the first embodiment, the first penetration portion 61 and the second penetration portion 62 do not overlap in the first direction A, and the first equipment F1 and the second equipment F2 are in the first extension direction D1. Are arranged at intervals in. Therefore, it is possible to maintain the sealing property between the first equipment F1 and the first component 51 and the sealing property between the second equipment F2 and the second component 52 without the two packings interfering with each other. can.

（１－５）第１貫通部６１及び第２貫通部６２から蓄電セル１０のガス抜きを実施したとき、スペーサ５０における第１貫通部６１及び第２貫通部６２の周囲にはガス圧が作用して応力が発生する。しかし、第１貫通部６１と第２貫通部６２とが第１方向Ａで重ならないため、第１貫通部６１と第２貫通部６２とが第１方向Ａで重なる場合と比べて、スペーサ５０における応力発生箇所を分散させ、局所的に応力が集中することを抑制できる。 (1-5) When the storage cell 10 is degassed from the first penetrating portion 61 and the second penetrating portion 62, gas pressure acts around the first penetrating portion 61 and the second penetrating portion 62 in the spacer 50. And stress is generated. However, since the first penetration portion 61 and the second penetration portion 62 do not overlap in the first direction A, the spacer 50 is compared with the case where the first penetration portion 61 and the second penetration portion 62 overlap in the first direction A. It is possible to disperse the stress generation points in the above and suppress the local concentration of stress.

＜第２の実施形態＞
次に、蓄電セル及び蓄電装置を具体化した第２の実施形態を図５～図７にしたがって説明する。なお、第２の実施形態は、第１の実施形態の第１貫通部６１及び第２貫通部６２を配置する位置を変更した構成であるため、同様の部分についてはその詳細な説明を省略する。 <Second embodiment>
Next, a second embodiment in which the power storage cell and the power storage device are embodied will be described with reference to FIGS. 5 to 7. Since the second embodiment has a configuration in which the positions for arranging the first penetrating portion 61 and the second penetrating portion 62 of the first embodiment are changed, detailed description thereof will be omitted for the same parts. ..

図５及び図６に示すように、第１貫通部６１は、第１構成体５１の第１壁部５１１を貫通する貫通孔である。第２貫通部６２は、第２構成体５２の第４壁部５２４を貫通する貫通孔である。第１貫通部６１は、第１スペーサ壁部５０ａに設けられ、第２貫通部６２は、第４スペーサ壁部５０ｄに設けられている。したがって、第１貫通部６１は、第２貫通部６２の設けられた壁部とは異なる壁部に設けられている。第１貫通部６１は、第１延設方向Ｄ１において、第１スペーサ壁部５０ａにおける第１壁部５１１の中間に設けられている。第２貫通部６２は、第４延設方向Ｄ４において、第４スペーサ壁部５０ｄにおける第４壁部５２４の中間に設けられている。第１貫通部６１と第２貫通部６２とは、第１方向Ａで見た平面視において、第２方向Ｂに対向するように配置されている。 As shown in FIGS. 5 and 6, the first penetration portion 61 is a through hole that penetrates the first wall portion 511 of the first component 51. The second penetration portion 62 is a through hole that penetrates the fourth wall portion 524 of the second structure 52. The first penetration portion 61 is provided on the first spacer wall portion 50a, and the second penetration portion 62 is provided on the fourth spacer wall portion 50d. Therefore, the first penetration portion 61 is provided on a wall portion different from the wall portion on which the second penetration portion 62 is provided. The first penetration portion 61 is provided in the middle of the first wall portion 511 in the first spacer wall portion 50a in the first extension direction D1. The second penetration portion 62 is provided in the middle of the fourth wall portion 524 in the fourth spacer wall portion 50d in the fourth extension direction D4. The first penetrating portion 61 and the second penetrating portion 62 are arranged so as to face the second direction B in the plan view seen in the first direction A.

スペーサ５０は、長四角枠状をなしている。第１延設方向Ｄ１及び第４延設方向Ｄ４に沿うスペーサ５０の長さは、第２延設方向Ｄ２及び第３延設方向Ｄ３に沿うスペーサ５０の長さよりも短い。第１延設方向Ｄ１及び第４延設方向Ｄ４は、スペーサ５０の短手方向と一致する。第２延設方向Ｄ２及び第３延設方向Ｄ３は、スペーサ５０の長手方向と一致する。 The spacer 50 has a long square frame shape. The length of the spacer 50 along the first extension direction D1 and the fourth extension direction D4 is shorter than the length of the spacer 50 along the second extension direction D2 and the third extension direction D3. The first extension direction D1 and the fourth extension direction D4 coincide with the lateral direction of the spacer 50. The second extension direction D2 and the third extension direction D3 coincide with the longitudinal direction of the spacer 50.

次に、蓄電セル１０に電解質を注入する方法の一例を説明するとともに、第２の実施形態の作用を説明する。
図７に示すように、蓄電セル１０の製造装置１００は、第１配管Ｘ１、第２配管Ｘ２、第３配管Ｘ３、第４配管Ｘ４、第１真空ポンプＰ１、第２真空ポンプＰ２、第１タンクＴ１、及び第２タンクＴ２を有している。 Next, an example of a method of injecting an electrolyte into the storage cell 10 will be described, and the operation of the second embodiment will be described.
As shown in FIG. 7, the manufacturing apparatus 100 of the power storage cell 10 includes a first pipe X1, a second pipe X2, a third pipe X3, a fourth pipe X4, a first vacuum pump P1, a second vacuum pump P2, and a first. It has a tank T1 and a second tank T2.

第１配管Ｘ１の第１端は、第１貫通部６１を介して蓄電セル１０の内部に挿入される。第１配管Ｘ１の第２端は、第１真空ポンプＰ１に接続されている。第１配管Ｘ１には、第１開閉弁Ｖ１が設けられている。第１開閉弁Ｖ１は、第１配管Ｘ１を遮断する閉状態と、第１配管Ｘ１を開放する開状態とに切り替え可能である。 The first end of the first pipe X1 is inserted into the storage cell 10 via the first penetrating portion 61. The second end of the first pipe X1 is connected to the first vacuum pump P1. The first on-off valve V1 is provided in the first pipe X1. The first on-off valve V1 can be switched between a closed state in which the first pipe X1 is shut off and an open state in which the first pipe X1 is opened.

第２配管Ｘ２の第１端は、第１開閉弁Ｖ１よりも第１配管Ｘ１の第１端側の第１配管Ｘ１の部位に接続されている。第２配管Ｘ２の第２端は、第１タンクＴ１に接続されている。第１タンクＴ１には、蓄電セル１０の第１空間Ｓ１に注入される電解質が貯蔵されている。第２配管Ｘ２には、第２開閉弁Ｖ２が設けられている。第２開閉弁Ｖ２は、第２配管Ｘ２を遮断する閉状態と、第２配管Ｘ２を開放する開状態とに切り替え可能である。 The first end of the second pipe X2 is connected to the portion of the first pipe X1 on the first end side of the first pipe X1 with respect to the first on-off valve V1. The second end of the second pipe X2 is connected to the first tank T1. In the first tank T1, the electrolyte to be injected into the first space S1 of the storage cell 10 is stored. The second on-off valve V2 is provided in the second pipe X2. The second on-off valve V2 can be switched between a closed state in which the second pipe X2 is shut off and an open state in which the second pipe X2 is opened.

第１配管Ｘ１には、流量計Ｙ１が設けられている。第１タンクＴ１から第２配管Ｘ２を介して第１空間Ｓ１に向けて電解質が流れる方向を流れ方向とする。流量計Ｙ１は、第1配管Ｘ１における第２配管Ｘ２の接続される部位よりも、流れ方向の下流に設けられている。流量計Ｙ１は、第１貫通部６１から第１配管Ｘ１に排出された電解質を検知する。 A flow meter Y1 is provided in the first pipe X1. The direction in which the electrolyte flows from the first tank T1 to the first space S1 via the second pipe X2 is defined as the flow direction. The flow meter Y1 is provided downstream of the portion of the first pipe X1 to which the second pipe X2 is connected in the flow direction. The flow meter Y1 detects the electrolyte discharged from the first penetration portion 61 to the first pipe X1.

第３配管Ｘ３の第１端は、第２貫通部６２を介して蓄電セル１０の内部に挿入される。第３配管Ｘ３の第２端は、第２真空ポンプＰ２に接続されている。第３配管Ｘ３には、第３開閉弁Ｖ３が設けられている。第３開閉弁Ｖ３は、第３配管Ｘ３を遮断する閉状態と、第３配管Ｘ３を開放する開状態とに切り替え可能である。 The first end of the third pipe X3 is inserted into the storage cell 10 via the second penetrating portion 62. The second end of the third pipe X3 is connected to the second vacuum pump P2. The third pipe X3 is provided with a third on-off valve V3. The third on-off valve V3 can be switched between a closed state in which the third pipe X3 is shut off and an open state in which the third pipe X3 is opened.

第４配管Ｘ４の第１端は、第３開閉弁Ｖ３よりも第３配管Ｘ３の第１端側の第３配管Ｘ３の部位に接続されている。第４配管Ｘ４の第２端は、第２タンクＴ２に接続されている。第２タンクＴ２には、蓄電セル１０の第２空間Ｓ２に注入される電解質が貯蔵されている。第４配管Ｘ４には、第４開閉弁Ｖ４が設けられている。第４開閉弁Ｖ４は、第４配管Ｘ４を遮断する閉状態と、第４配管Ｘ４を開放する開状態とに切り替え可能である。 The first end of the fourth pipe X4 is connected to the portion of the third pipe X3 on the first end side of the third pipe X3 with respect to the third on-off valve V3. The second end of the fourth pipe X4 is connected to the second tank T2. The second tank T2 stores the electrolyte to be injected into the second space S2 of the storage cell 10. The fourth on-off valve V4 is provided in the fourth pipe X4. The fourth on-off valve V4 can be switched between a closed state in which the fourth pipe X4 is shut off and an open state in which the fourth pipe X4 is opened.

第１開閉弁Ｖ１、第２開閉弁Ｖ２、第３開閉弁Ｖ３、及び第４開閉弁Ｖ４は、図示しない制御装置によって、閉状態と開状態とを切り替え可能に制御されている。流量計Ｙ１によって検知された電解質の流量は、制御装置に出力される。 The first on-off valve V1, the second on-off valve V2, the third on-off valve V3, and the fourth on-off valve V4 are controlled so as to be switchable between a closed state and an open state by a control device (not shown). The flow rate of the electrolyte detected by the flow meter Y1 is output to the control device.

第１真空ポンプＰ１は、蓄電セル１０の空間Ｓを減圧する。第２真空ポンプＰ２は、蓄電セル１０の空間Ｓを減圧する。
蓄電セル１０に電解質を注入する方法は、第１工程、第２工程、及び第３工程を有している。蓄電セル１０に電解質を注入する方法は、第１工程、第２工程、及び第３工程の順に実施する。 The first vacuum pump P1 decompresses the space S of the storage cell 10. The second vacuum pump P2 decompresses the space S of the storage cell 10.
The method of injecting an electrolyte into the storage cell 10 includes a first step, a second step, and a third step. The method of injecting the electrolyte into the storage cell 10 is carried out in the order of the first step, the second step, and the third step.

第１工程では、第１貫通部６１を介して蓄電セル１０の空間Ｓを減圧するとともに、第２貫通部６２を介して蓄電セル１０の空間Ｓを減圧する。第１工程の開始時点では、制御装置は、第１開閉弁Ｖ１及び第３開閉弁Ｖ３を開状態にするとともに、第２開閉弁Ｖ２及び第４開閉弁Ｖ４を閉状態にする。 In the first step, the space S of the storage cell 10 is depressurized through the first penetrating portion 61, and the space S of the storage cell 10 is depressurized through the second penetrating portion 62. At the start of the first step, the control device opens the first on-off valve V1 and the third on-off valve V3, and closes the second on-off valve V2 and the fourth on-off valve V4.

第１工程では、制御装置は、第１真空ポンプＰ１及び第２真空ポンプＰ２を駆動させる。すると、第１空間Ｓ１及び第２空間Ｓ２が減圧され、蓄電セル１０の空間Ｓが減圧される。つまり、第１工程では、蓄電セル１０の空間Ｓが、第２方向Ｂの両側から減圧され、空間Ｓが所定の圧力まで減圧される。 In the first step, the control device drives the first vacuum pump P1 and the second vacuum pump P2. Then, the first space S1 and the second space S2 are decompressed, and the space S of the storage cell 10 is depressurized. That is, in the first step, the space S of the storage cell 10 is depressurized from both sides of the second direction B, and the space S is depressurized to a predetermined pressure.

第２工程では、第１貫通部６１を介して蓄電セル１０の空間Ｓを減圧するとともに、第２貫通部６２を介して第２空間Ｓ２に電解質を注入する。第２工程では、制御装置は、第１開閉弁Ｖ１を開状態に維持するとともに、第２開閉弁Ｖ２を閉状態に維持したままとする。また、第２工程では、制御装置は、第３開閉弁Ｖ３を開状態から閉状態に切り替え、第２空間Ｓ２を減圧することを停止する。制御装置は、第３開閉弁Ｖ３を開状態から閉状態に切り替えると同時、又は第３開閉弁Ｖ３を開状態から閉状態に切り替えた後に、第４開閉弁Ｖ４を閉状態から開状態に切り替える。すると、第２貫通部６２を介して第２タンクＴ２から蓄電セル１０の第２空間Ｓ２に電解質が注入される。 In the second step, the space S of the storage cell 10 is depressurized through the first penetrating portion 61, and the electrolyte is injected into the second space S2 through the second penetrating portion 62. In the second step, the control device keeps the first on-off valve V1 in the open state and the second on-off valve V2 in the closed state. Further, in the second step, the control device switches the third on-off valve V3 from the open state to the closed state, and stops depressurizing the second space S2. The control device switches the fourth on-off valve V4 from the closed state to the open state at the same time as switching the third on-off valve V3 from the open state to the closed state, or after switching the third on-off valve V3 from the open state to the closed state. .. Then, the electrolyte is injected from the second tank T2 into the second space S2 of the storage cell 10 via the second penetrating portion 62.

第２空間Ｓ２に注入された電解質は、セパレータ４０を介して第１空間Ｓ１にも誘導される。所定の量の電解質が第２貫通部６２を介して第２空間Ｓ２に注入されると、第１空間Ｓ１から第１貫通部６１を介して第１配管Ｘ１に電解質が排出されることがある。すると、流量計Ｙ１により電解質が検知される。制御装置は、流量計Ｙ１からの信号を入力すると、第１開閉弁Ｖ１を開状態から閉状態に切り替え、第１貫通部６１を介して蓄電セル１０の空間Ｓを減圧することを停止する。 The electrolyte injected into the second space S2 is also guided to the first space S1 via the separator 40. When a predetermined amount of electrolyte is injected into the second space S2 via the second penetration portion 62, the electrolyte may be discharged from the first space S1 to the first pipe X1 via the first penetration portion 61. .. Then, the electrolyte is detected by the flow meter Y1. When the signal from the flow meter Y1 is input, the control device switches the first on-off valve V1 from the open state to the closed state, and stops depressurizing the space S of the storage cell 10 via the first penetration portion 61.

第３工程では、制御装置は、第１開閉弁Ｖ１を開状態から閉状態に切り替えると同時、又は第１開閉弁Ｖ１を開状態から閉状態に切り替えた後に、第２開閉弁Ｖ２を閉状態から開状態に切り替える。すると、第１貫通部６１を介して第１タンクＴ１から蓄電セル１０の第１空間Ｓ１に電解質が注入される。 In the third step, the control device closes the second on-off valve V2 at the same time as switching the first on-off valve V1 from the open state to the closed state, or after switching the first on-off valve V1 from the open state to the closed state. Switch from to open state. Then, the electrolyte is injected from the first tank T1 into the first space S1 of the storage cell 10 via the first penetrating portion 61.

第２の実施形態によれば、第１の実施形態に記載の効果に加えて、以下の効果を得ることができる。
（２－１）第１貫通部６１は第１スペーサ壁部５０ａに設けられ、第２貫通部６２は第４スペーサ壁部５０ｄに設けられている。例えば、第１貫通部６１が、第２貫通部６２の設けられた第４スペーサ壁部５０ｄに設けられる構成に比べて、第１貫通部６１と第２貫通部６２とを離して配置し易い。 According to the second embodiment, the following effects can be obtained in addition to the effects described in the first embodiment.
(2-1) The first penetration portion 61 is provided on the first spacer wall portion 50a, and the second penetration portion 62 is provided on the fourth spacer wall portion 50d. For example, the first penetrating portion 61 is easier to arrange the first penetrating portion 61 and the second penetrating portion 62 apart from each other as compared with the configuration provided in the fourth spacer wall portion 50d provided with the second penetrating portion 62. ..

（２－２）第１貫通部６１と第２貫通部６２とが、第２方向Ｂの両側に離れて配置されている。このため、第１工程において、蓄電セル１０の空間Ｓの空気を大きく離した二箇所となる第２方向Ｂの両側から吸引でき、蓄電セル１０の空間Ｓの空気を素早く蓄電セル１０の外部へ排出できる。したがって、蓄電セル１０の空間Ｓの減圧時間を短縮できる。 (2-2) The first penetrating portion 61 and the second penetrating portion 62 are arranged apart from each other on both sides of the second direction B. Therefore, in the first step, the air in the space S of the storage cell 10 can be sucked from both sides of the second direction B, which are two places greatly separated, and the air in the space S of the storage cell 10 can be quickly sent to the outside of the storage cell 10. Can be discharged. Therefore, the decompression time of the space S of the storage cell 10 can be shortened.

（２－３）第２工程において、第１貫通部６１から蓄電セル１０の空間Ｓを減圧しながら、第２貫通部６２から蓄電セル１０の空間Ｓに電解質を注入する。このため、第２貫通部６２を介して空間Ｓに注入した電解質によって蓄電セル１０の空間Ｓに残存する空気を空間Ｓの外へ押し出すことができる。したがって、蓄電セル１０の空間Ｓの注液時間を短縮できる。 (2-3) In the second step, the electrolyte is injected from the second penetration portion 62 into the space S of the storage cell 10 while reducing the pressure in the space S of the storage cell 10 from the first penetration portion 61. Therefore, the air remaining in the space S of the storage cell 10 can be pushed out of the space S by the electrolyte injected into the space S through the second penetrating portion 62. Therefore, the injection time of the space S of the storage cell 10 can be shortened.

（２－４）第３工程において、第１貫通部６１と第２貫通部６２を第２方向Ｂに離して配置した状態で、正極活物質層２２、負極活物質層３２、及びセパレータ４０に対し電解質を含浸させるようにした。仮に、第１貫通部６１と第２貫通部６２とが第１方向Ａで重なる場合に比べて、正極活物質層２２、負極活物質層３２、及びセパレータ４０に対し、第２方向Ｂに離れた二箇所から電解質を供給でき、正極活物質層２２、負極活物質層３２、及びセパレータ４０に対し電解質を含浸させ易くできる。したがって、蓄電セル１０に対する電解質の含浸時間をさらに短縮できる。 (2-4) In the third step, in a state where the first penetrating portion 61 and the second penetrating portion 62 are arranged apart from each other in the second direction B, the positive electrode active material layer 22, the negative electrode active material layer 32, and the separator 40 are formed. On the other hand, the electrolyte was impregnated. As compared with the case where the first penetration portion 61 and the second penetration portion 62 overlap in the first direction A, the positive electrode active material layer 22, the negative electrode active material layer 32, and the separator 40 are separated from each other in the second direction B. The electrolyte can be supplied from these two locations, and the positive electrode active material layer 22, the negative electrode active material layer 32, and the separator 40 can be easily impregnated with the electrolyte. Therefore, the impregnation time of the electrolyte for the storage cell 10 can be further shortened.

（２－５）蓄電セル１０の空間Ｓを減圧する際に使用する配管と、蓄電セル１０の空間Ｓに電解質を注入する際に使用する配管とは、第1配管Ｘ１における第２配管Ｘ２の接続される部位よりも流れ方向の下流側で共通している。これによれば、仮に、第２貫通部６２を介した減圧から、蓄電セル１０の空間Ｓへの電解質の注入に切り替える際に、第２貫通部６２から注入した電解質が第１貫通部６１から蓄電セル１０の外部へ漏れてしまったとしても、第１タンクＴ１から注入された電解質で蓄電セル１０の外部へ漏れた電解質を蓄電セル１０の内部へ押し戻すことができる。 (2-5) The pipe used to reduce the pressure in the space S of the storage cell 10 and the pipe used to inject the electrolyte into the space S of the storage cell 10 are the pipes of the second pipe X2 in the first pipe X1. It is common on the downstream side of the flow direction from the connected part. According to this, when switching from the decompression via the second penetration portion 62 to the injection of the electrolyte into the space S of the storage cell 10, the electrolyte injected from the second penetration portion 62 is from the first penetration portion 61. Even if the electrolyte leaks to the outside of the storage cell 10, the electrolyte injected from the first tank T1 can push the electrolyte leaked to the outside of the storage cell 10 back to the inside of the storage cell 10.

（２－６）第１貫通部６１が第１スペーサ壁部５０ａに設けられるとともに、第２貫通部６２が第４スペーサ壁部５０ｄに設けられることにより、第１貫通部６１と第２貫通部６２とが、スペーサ５０の長手方向で対向している。例えば、第１貫通部６１が第２スペーサ壁部５０ｂに設けられるとともに、第２貫通部６２が第３スペーサ壁部５０ｃに設けられることにより、第１貫通部６１と第２貫通部６２とが、スペーサ５０の短手方向で対向する場合に比べて、第１貫通部６１と第２貫通部６２とを離して配置し易い。 (2-6) The first penetration portion 61 is provided in the first spacer wall portion 50a, and the second penetration portion 62 is provided in the fourth spacer wall portion 50d, whereby the first penetration portion 61 and the second penetration portion are provided. 62 faces the spacer 50 in the longitudinal direction. For example, the first penetration portion 61 is provided in the second spacer wall portion 50b, and the second penetration portion 62 is provided in the third spacer wall portion 50c, so that the first penetration portion 61 and the second penetration portion 62 can be provided. The first penetrating portion 61 and the second penetrating portion 62 can be easily arranged apart from each other as compared with the case where the spacers 50 face each other in the lateral direction.

（２－７）第１貫通部６１が第１スペーサ壁部５０ａに設けられるとともに、第２貫通部６２が第１スペーサ壁部５０ａと対向する第４スペーサ壁部５０ｄに設けられている。このため、例えば、第１貫通部６１が第１スペーサ壁部５０ａに設けられるとともに、第２貫通部６２が第２スペーサ壁部５０ｂや第３スペーサ壁部５０ｃに設けられている場合に比べて、第２貫通部６２をより第１貫通部６１より離れた位置に配置できる。これにより、第１貫通部６１から空気を抜きにくいあるいは電解質を含浸させにくい蓄電セル１０の第１貫通部６１より離れた部分を第２貫通部６２により減圧あるいは電解質を含浸できるため、蓄電セル１０の注液時間をさらに短縮できる。 (2-7) The first penetration portion 61 is provided on the first spacer wall portion 50a, and the second penetration portion 62 is provided on the fourth spacer wall portion 50d facing the first spacer wall portion 50a. Therefore, for example, as compared with the case where the first penetration portion 61 is provided in the first spacer wall portion 50a and the second penetration portion 62 is provided in the second spacer wall portion 50b or the third spacer wall portion 50c. , The second penetrating portion 62 can be arranged at a position further away from the first penetrating portion 61. As a result, the portion of the storage cell 10 that is difficult to remove air from the first penetration portion 61 or is difficult to impregnate with the electrolyte can be depressurized or impregnated with the electrolyte by the second penetration portion 62. The injection time can be further shortened.

なお、上記実施形態は、以下のように変更して実施できる。上記実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施できる。
○ 第１の実施形態において、第１貫通部６１及び第２貫通部６２に同時に電解質を注入できるのであれば、電解質を注入するための設備の数は１つだけでもよい。 The above embodiment can be modified and implemented as follows. The above embodiment and the following modification examples can be implemented in combination with each other within a technically consistent range.
○ In the first embodiment, if the electrolyte can be injected into the first penetration portion 61 and the second penetration portion 62 at the same time, the number of equipment for injecting the electrolyte may be only one.

○ 各実施形態において、スペーサ５０は、第１構成体５１と第２構成体５２とを重ねることで構成されていたが、単一の枠状部材に変更してもよい。合わせて第１貫通部６１及び第２貫通部６２を図８のように変更してもよい。 -In each embodiment, the spacer 50 is configured by overlapping the first component 51 and the second component 52, but it may be changed to a single frame-shaped member. At the same time, the first penetrating portion 61 and the second penetrating portion 62 may be changed as shown in FIG.

図８に示すように、スペーサ５０は、第１方向Ａの両端面のうち正極集電体２１寄りの一端面に第１端面５０１を有し、負極集電体３１寄りの他端面に第２端面５０２を有している。第１端面５０１及び第２端面５０２は、図示しないが、平面視において四角枠状をなしている。 As shown in FIG. 8, the spacer 50 has a first end surface 501 on one end surface near the positive electrode current collector 21 among both end faces in the first direction A, and a second end surface on the other end surface near the negative electrode current collector 31. It has an end face 502. Although not shown, the first end surface 501 and the second end surface 502 have a square frame shape in a plan view.

蓄電セル１０は、第１貫通部形成部材８１と、第２貫通部形成部材８２とを備えている。第１貫通部形成部材８１及び第２貫通部形成部材８２は、スペーサ５０の第２端面５０２に負極集電体３１及びセパレータ４０とともに積層されている。第１貫通部形成部材８１及び第２貫通部形成部材８２は、第１延設方向Ｄ１に間隔を隔てて配置されている。 The storage cell 10 includes a first penetration portion forming member 81 and a second penetration portion forming member 82. The first penetration portion forming member 81 and the second penetration portion forming member 82 are laminated together with the negative electrode current collector 31 and the separator 40 on the second end surface 502 of the spacer 50. The first penetration portion forming member 81 and the second penetration portion forming member 82 are arranged at intervals in the first extension direction D1.

第１貫通部形成部材８１は、第１樹脂部８１ａと、第１樹脂部８１ａに埋設された第１筒部材８１ｂとを有する。第１樹脂部８１ａは、スペーサ５０の第２端面５０２に溶着され、スペーサ５０と一体化されている。 The first penetrating portion forming member 81 has a first resin portion 81a and a first cylinder member 81b embedded in the first resin portion 81a. The first resin portion 81a is welded to the second end surface 502 of the spacer 50 and integrated with the spacer 50.

第２貫通部形成部材８２は、第２樹脂部８２ａと、第２樹脂部８２ａに埋設された第２筒部材８２ｂとを有する。第２樹脂部８２ａは、図８の紙面手前方向においてスペーサ５０の第２端面５０２に溶着され、スペーサ５０と一体化されている。 The second penetrating portion forming member 82 has a second resin portion 82a and a second cylinder member 82b embedded in the second resin portion 82a. The second resin portion 82a is welded to the second end surface 502 of the spacer 50 in the front direction of the paper surface in FIG. 8 and is integrated with the spacer 50.

第１樹脂部８１ａには、第１貫通部９１が設けられている。第１貫通部９１は、第１樹脂部８１ａを第２延設方向Ｄ２及び第３延設方向Ｄ３（図８の紙面手前及び紙面奥行方向）に貫通する貫通孔である。第１貫通部９１は、第１樹脂部８１ａにおける第１空間Ｓ１と蓄電セル１０の外部との間を第２方向Ｂに延びている。第１貫通部９１の内周面には、第１筒部材８１ｂが設けられている。第１貫通部９１の内周面と第１筒部材８１ｂの外周面とは溶着されている。第１筒部材８１ｂの内部には、第１封止樹脂１０１が設けられている。なお、第１封止樹脂１０１は、第１の実施形態の第１閉塞部７１と同じ構成である。 The first resin portion 81a is provided with a first penetration portion 91. The first penetration portion 91 is a through hole that penetrates the first resin portion 81a in the second extension direction D2 and the third extension direction D3 (front of the paper surface and depth of the paper surface in FIG. 8). The first penetrating portion 91 extends in the second direction B between the first space S1 in the first resin portion 81a and the outside of the storage cell 10. A first cylinder member 81b is provided on the inner peripheral surface of the first penetrating portion 91. The inner peripheral surface of the first penetrating portion 91 and the outer peripheral surface of the first cylinder member 81b are welded together. A first sealing resin 101 is provided inside the first cylinder member 81b. The first sealing resin 101 has the same configuration as the first closing portion 71 of the first embodiment.

第１樹脂部８１ａ及び第２樹脂部８２ａがスペーサ５０の第２端面５０２と一体化することから、第１樹脂部８１ａ及び第２樹脂部８２ａは、スペーサ５０の一部である。すなわち、第１貫通部９１及び第２貫通部９２は、スペーサ５０に設けられている。第１筒部材８１ｂ及び第１封止樹脂１０１は、第１閉塞部の一例である。第２筒部材８２ｂ及び第２封止樹脂１０２は、第２閉塞部の一例である。 Since the first resin portion 81a and the second resin portion 82a are integrated with the second end surface 502 of the spacer 50, the first resin portion 81a and the second resin portion 82a are a part of the spacer 50. That is, the first penetrating portion 91 and the second penetrating portion 92 are provided in the spacer 50. The first cylinder member 81b and the first sealing resin 101 are examples of the first closed portion. The second cylinder member 82b and the second sealing resin 102 are examples of the second closing portion.

○ 上記の変更例において、第１貫通部形成部材８１と第２貫通部形成部材８２とは第１延設方向Ｄ１において間隔を隔てて設けられていたが、図９のように変更してもよい。
図９に示すように、第１方向Ａにおいて、第２貫通部形成部材８２を第１貫通部形成部材８１に積層してもよい。そして、第１貫通部９１は、第１樹脂部８１ａと第２樹脂部８２ａとにより形成され、且つ第２延設方向Ｄ２及び第３延設方向Ｄ３で第１樹脂部８１ａ及び第２樹脂部８２ａを貫通する貫通孔としてもよい。第１貫通部９１は、第１空間Ｓ１と蓄電セル１０の外部との間で第２方向Ｂに延びている。第２貫通部９２は、第２樹脂部８２ａに形成され、且つ第１方向Ａにおいてスペーサ５０に向けて凹む溝部であってもよい。第２貫通部９２は、第２延設方向Ｄ２及び第３延設方向Ｄ３に延びている。第２貫通部９２は、第２空間Ｓ２と蓄電セル１０の外部との間を第２方向Ｂに延びている。第２貫通部９２の第１方向Ａにおける開口は、負極集電体３１の第１面３１ａにより閉塞されるように構成されてもよい。第２貫通部９２と負極集電体３１の第１面３１ａとにより形成される貫通孔を、第２筒部材８２ｂ及び第２封止樹脂１０２により閉塞するとよい。 ○ In the above modification example, the first penetration portion forming member 81 and the second penetration portion forming member 82 are provided at intervals in the first extension direction D1, but even if they are changed as shown in FIG. good.
As shown in FIG. 9, in the first direction A, the second penetration portion forming member 82 may be laminated on the first penetration portion forming member 81. The first penetrating portion 91 is formed by the first resin portion 81a and the second resin portion 82a, and the first resin portion 81a and the second resin portion are formed in the second extension direction D2 and the third extension direction D3. It may be a through hole penetrating 82a. The first penetrating portion 91 extends in the second direction B between the first space S1 and the outside of the storage cell 10. The second penetrating portion 92 may be a groove portion formed in the second resin portion 82a and recessed toward the spacer 50 in the first direction A. The second penetrating portion 92 extends in the second extension direction D2 and the third extension direction D3. The second penetrating portion 92 extends in the second direction B between the second space S2 and the outside of the storage cell 10. The opening of the second penetrating portion 92 in the first direction A may be configured to be closed by the first surface 31a of the negative electrode current collector 31. The through hole formed by the second through portion 92 and the first surface 31a of the negative electrode current collector 31 may be closed by the second cylinder member 82b and the second sealing resin 102.

○ 第１の実施形態において、平面視において、第１貫通部６１と第２貫通部６２とが重なっていてもよい。
○ 第１の実施形態において、第１貫通部６１は、第１空間Ｓ１と蓄電セル１０の外部との間を第２方向Ｂに延びているのであれば、第１壁部５１１ではなく、第２壁部５１２、第３壁部５１３、及び第４壁部５１４のいずれに設けられていてもよい。また、第１貫通部６１は、第２延設方向Ｄ２及び第３延設方向Ｄ３に延びていたが、延びる方向を適宜変更してもよい。 ○ In the first embodiment, the first penetrating portion 61 and the second penetrating portion 62 may overlap each other in a plan view.
○ In the first embodiment, if the first penetration portion 61 extends in the second direction B between the first space S1 and the outside of the storage cell 10, it is not the first wall portion 511 but the first wall portion 511. It may be provided in any of the two wall portions 512, the third wall portion 513, and the fourth wall portion 514. Further, although the first penetration portion 61 extends in the second extension direction D2 and the third extension direction D3, the extension direction may be appropriately changed.

○ 第１の実施形態において、第２貫通部６２は、第２空間Ｓ２と蓄電セル１０の外部との間を第２方向Ｂに延びているのであれば、第１壁部５２１ではなく、第２壁部５２２、第３壁部５２３、及び第４壁部５２４のいずれに設けられていてもよい。また、第２貫通部６２は、第２延設方向Ｄ２及び第３延設方向Ｄ３に延びていたが、延びる方向は適宜変更してもよい。 ○ In the first embodiment, if the second penetration portion 62 extends in the second direction B between the second space S2 and the outside of the storage cell 10, the second penetration portion 62 is not the first wall portion 521 but the first wall portion 521. It may be provided in any of the two wall portions 522, the third wall portion 523, and the fourth wall portion 524. Further, although the second penetration portion 62 extends in the second extension direction D2 and the third extension direction D3, the extension direction may be appropriately changed.

○ 第２の実施形態において、第１貫通部６１と第２貫通部６２とは、第１方向Ａで見た平面視において、第２方向Ｂに対向するように配置されていたが、これに限らない。例えば、第１貫通部６１が第１スペーサ壁部５０ａに設けられるとともに、第２貫通部６２が第３スペーサ壁部５０ｃに設けられていてもよい。要は、第１貫通部６１の設けられた壁部と第２貫通部６２の設けられたスペーサ壁部とが異なっていればよい。 ○ In the second embodiment, the first penetrating portion 61 and the second penetrating portion 62 are arranged so as to face the second direction B in the plan view seen in the first direction A. Not exclusively. For example, the first penetration portion 61 may be provided in the first spacer wall portion 50a, and the second penetration portion 62 may be provided in the third spacer wall portion 50c. In short, the wall portion provided with the first penetrating portion 61 and the spacer wall portion provided with the second penetrating portion 62 may be different from each other.

○ 第２の実施形態において、第１貫通部６１を介した空間Ｓの減圧から電解質の注入に切り替える契機は、第１配管Ｘ１に設けられた流量計Ｙ１によって管理される構成であったが、これに限らない。第１貫通部６１を介した減圧から電解質の注入に切り替える契機は、例えば、第２貫通部６２から電解質を注入した注入時間によって管理される構成であってもよい。 ○ In the second embodiment, the trigger for switching from the decompression of the space S through the first penetration portion 61 to the injection of the electrolyte was controlled by the flow meter Y1 provided in the first pipe X1. Not limited to this. The trigger for switching from the decompression via the first penetrating portion 61 to the injection of the electrolyte may be controlled by, for example, the injection time in which the electrolyte is injected from the second penetrating portion 62.

○ 第２の実施形態において、第１真空ポンプＰ１と第２真空ポンプＰ２を１つの共通の真空ポンプに代えてもよい。また、第１タンクＴ１と第２タンクＴ２を１つの共通のタンクに代えてもよい。 ○ In the second embodiment, the first vacuum pump P1 and the second vacuum pump P2 may be replaced with one common vacuum pump. Further, the first tank T1 and the second tank T2 may be replaced with one common tank.

○ 各実施形態において、第１貫通部６１は、第１構成体５１に設けられた貫通孔であったが、第１貫通部６１を第１構成体５１の第１端面５１ａから第１方向Ａに凹む溝に変更してもよい。当該溝を正極集電体２１の外周縁部２１ｄにより閉塞して貫通孔を形成し、当該貫通孔を第１閉塞部７１で閉塞してもよい。なお、当該貫通孔を上記変更例に記載した第１筒部材８１ｂ及び第１封止樹脂１０１で閉塞してもよい。 ○ In each embodiment, the first penetration portion 61 is a through hole provided in the first component 51, but the first penetration portion 61 is provided in the first direction A from the first end surface 51a of the first component 51. It may be changed to a groove dented in. The groove may be closed by the outer peripheral edge portion 21d of the positive electrode current collector 21 to form a through hole, and the through hole may be closed by the first closed portion 71. The through hole may be closed by the first cylinder member 81b and the first sealing resin 101 described in the above modified example.

○ 各実施形態において、第２貫通部６２は、第２構成体５２に設けられた貫通孔であったが、第２貫通部６２を第２構成体５２の第１端面５２ａから第１方向Ａに凹む溝に変更してもよい。当該溝を負極集電体３１の外周縁部３１ｄにより閉塞して貫通孔を形成し、当該貫通孔を第２閉塞部７２で閉塞してもよい。なお、当該貫通孔を上記変更例に記載した第２筒部材８２ｂ及び第２封止樹脂１０２で閉塞してもよい。 ○ In each embodiment, the second penetration portion 62 is a through hole provided in the second component 52, but the second penetration portion 62 is provided in the first direction A from the first end surface 52a of the second component 52. It may be changed to a groove dented in. The groove may be closed by the outer peripheral edge portion 31d of the negative electrode current collector 31 to form a through hole, and the through hole may be closed by the second closing portion 72. The through hole may be closed by the second cylinder member 82b and the second sealing resin 102 described in the above modified example.

○ 各実施形態において、第１貫通部６１及び第２貫通部６２から電解質を蓄電セル１０に注入した後、蓄電セル１０の内部に発生したガスを排出するためのガス排出部を別途設けるようにしてもよい。当該ガス排出部は、第１貫通部６１及び第２貫通部６２から最も離れた位置に配置するとよい。 ○ In each embodiment, after the electrolyte is injected into the storage cell 10 from the first penetration portion 61 and the second penetration portion 62, a gas discharge unit for discharging the gas generated inside the storage cell 10 is separately provided. You may. The gas discharging portion may be arranged at a position farthest from the first penetrating portion 61 and the second penetrating portion 62.

○ 各実施形態において、セパレータ４０の非対向部４１を挟む箇所は、空間Ｓを第１空間Ｓ１と第２空間Ｓ２に区画できれば、適宜変更してもよい。例えば、スペーサ５０を３つの枠状の構成体もしくは４つ以上の枠状の構成体で構成し、隣り合う構成体の間に非対向部４１を挟んでもよい。 ○ In each embodiment, the portion sandwiching the non-opposing portion 41 of the separator 40 may be appropriately changed as long as the space S can be divided into the first space S1 and the second space S2. For example, the spacer 50 may be composed of three frame-shaped structures or four or more frame-shaped structures, and the non-opposing portion 41 may be sandwiched between adjacent structures.

○ 各実施形態において、第１構成体５１及び第２構成体５２は、矩形枠状をなしていたが、例えば、正極集電体２１の外周縁部２１ｄと負極集電体３１の外周縁部３１ｄとの間に配置され、正極活物質層２２及び負極活物質層３２を囲む枠状をなしていれば、形状は適宜変更してもよい。例えば、平面視においてひし形や平行四辺形であってもよいし、円形をなしていてもよい。なお、上記変更例の単一のスペーサ５０も同様に変更してもよい。 ○ In each embodiment, the first component 51 and the second component 52 have a rectangular frame shape. For example, the outer peripheral edge portion 21d of the positive electrode current collector 21 and the outer peripheral edge portion of the negative electrode current collector 31 are formed. The shape may be appropriately changed as long as it is arranged between 31d and has a frame shape surrounding the positive electrode active material layer 22 and the negative electrode active material layer 32. For example, it may be a rhombus, a parallelogram, or a circle in a plan view. The single spacer 50 in the above modification may be changed in the same manner.

○ 各実施形態において、蓄電装置１は、上記変更例に記載した蓄電セル１０を含むように構成してもよい。
○ 各実施形態において、バイポーラ電極１３を構成する上で、積層方向Ｃに隣り合う一方の蓄電セル１０の正極集電体２１の第２面２１ｂと、他方の蓄電セル１０の負極集電体３１の第２面３１ｂとを接触させていたが、例えば、正極集電体２１と負極集電体３１とを一体的に構成してもよい。 ○ In each embodiment, the power storage device 1 may be configured to include the power storage cell 10 described in the above modification.
○ In each embodiment, in constructing the bipolar electrode 13, the second surface 21b of the positive electrode current collector 21 of one of the storage cells 10 adjacent to each other in the stacking direction C and the negative electrode current collector 31 of the other storage cell 10 Although the second surface 31b of the above is in contact with each other, for example, the positive electrode current collector 21 and the negative electrode current collector 31 may be integrally configured.

○ 各実施形態において、正極集電体２１と負極集電体３１とは異なる材質で構成されていたが、これに限らない。正極集電体２１と負極集電体３１とが同じ材質で構成されていてもよい。 ○ In each embodiment, the positive electrode current collector 21 and the negative electrode current collector 31 are made of different materials, but the present invention is not limited to this. The positive electrode current collector 21 and the negative electrode current collector 31 may be made of the same material.

１…蓄電装置、１０…蓄電セル、２０…正極、２１…正極集電体、２１ａ…第１面、２１ｄ…外周縁部、２２…正極活物質層、３０…負極、３１…負極集電体、３１ａ…第１面、３１ｄ…外周縁部、３２…負極活物質層、４０…セパレータ、４１…非対向部、５０…スペーサ、５０ａ…スペーサの壁部としての第１スペーサ壁部、５０ｂ…スペーサの壁部としての第２スペーサ壁部、５０ｃ…スペーサの壁部としての第３スペーサ壁部、５０ｄ…スペーサの壁部としての第４スペーサ壁部、５１…第１構成体、５２…第２構成体、６１…第１貫通部、６２…第２貫通部、７１…第１閉塞部、７２…第２閉塞部、９１…第１貫通部、９２…第２貫通部、Ｓ…空間、Ｓ１…第１空間、Ｓ２…第２空間、Ａ…第１方向、Ｂ…第２方向、Ｄ１…第１延設方向、Ｄ２…第２延設方向、Ｄ３…第３延設方向、Ｄ４…第４延設方向。 1 ... power storage device, 10 ... power storage cell, 20 ... positive electrode, 21 ... positive electrode current collector, 21a ... first surface, 21d ... outer peripheral edge, 22 ... positive electrode active material layer, 30 ... negative electrode, 31 ... negative electrode current collector , 31a ... 1st surface, 31d ... outer peripheral edge, 32 ... negative electrode active material layer, 40 ... separator, 41 ... non-opposing portion, 50 ... spacer, 50a ... first spacer wall portion as a spacer wall portion, 50b ... The second spacer wall portion as the wall portion of the spacer, 50c ... the third spacer wall portion as the wall portion of the spacer, 50d ... the fourth spacer wall portion as the wall portion of the spacer, 51 ... the first component, 52 ... 2 configurations, 61 ... 1st penetrating portion, 62 ... 2nd penetrating portion, 71 ... 1st closed portion, 72 ... 2nd closed portion, 91 ... 1st penetrating portion, 92 ... 2nd penetrating portion, S ... space, S1 ... 1st space, S2 ... 2nd space, A ... 1st direction, B ... 2nd direction, D1 ... 1st extension direction, D2 ... 2nd extension direction, D3 ... 3rd extension direction, D4 ... Fourth extension direction.

Claims (4)

一対の集電体と、
前記一対の集電体の一方に設けられた正極活物質層と、
前記一対の集電体の他方に設けられ、前記正極活物質層と対向配置された負極活物質層と、
対向配置された前記正極活物質層と前記負極活物質層との間に挟まれたセパレータと、
前記一対の集電体のそれぞれの外周縁部の間に配置され、前記正極活物質層及び前記負極活物質層を囲む枠状をなすスペーサと、を備え、
前記セパレータは、前記一対の集電体及び前記スペーサにより区画された空間を、前記正極活物質層が位置する第１空間と、前記負極活物質層が位置する第２空間とに区画している蓄電セルであって、
前記一対の集電体、前記正極活物質層、前記セパレータ、及び前記負極活物質層が重なり合う第１方向に直交する方向を第２方向とすると、
前記スペーサに設けられ、且つ前記第１空間と前記蓄電セルの外部との間を前記第２方向に延びる第１貫通部と、
前記スペーサに設けられ、且つ前記第２空間と前記蓄電セルの外部との間を前記第２方向に延びる第２貫通部と、
前記第１貫通部を閉塞する第１閉塞部と、
前記第２貫通部を閉塞する第２閉塞部と、を備えることを特徴とする蓄電セル。 A pair of current collectors and
A positive electrode active material layer provided on one of the pair of current collectors,
A negative electrode active material layer provided on the other side of the pair of current collectors and arranged to face the positive electrode active material layer,
A separator sandwiched between the positive electrode active material layer and the negative electrode active material layer arranged to face each other,
A frame-shaped spacer that is arranged between the outer peripheral edges of each of the pair of current collectors and surrounds the positive electrode active material layer and the negative electrode active material layer is provided.
The separator divides the space partitioned by the pair of current collectors and the spacer into a first space in which the positive electrode active material layer is located and a second space in which the negative electrode active material layer is located. It ’s a storage cell,
Assuming that the direction orthogonal to the first direction in which the pair of current collectors, the positive electrode active material layer, the separator, and the negative electrode active material layer overlap is the second direction,
A first penetrating portion provided in the spacer and extending in the second direction between the first space and the outside of the storage cell,
A second penetrating portion provided in the spacer and extending in the second direction between the second space and the outside of the storage cell,
The first closed portion that closes the first penetrating portion and the first closed portion
A storage cell including a second closed portion that closes the second penetrating portion. 前記第１方向で見た平面視において、前記第１貫通部と前記第２貫通部とは重ならないことを特徴とする請求項１に記載の蓄電セル。 The storage cell according to claim 1, wherein the first penetrating portion and the second penetrating portion do not overlap in a plan view viewed in the first direction. 前記スペーサは、複数の壁部で構成されて前記平面視において矩形枠状であり、
前記第１貫通部は、前記第２貫通部の設けられた前記壁部とは異なる前記壁部に設けられることを特徴とする請求項２に記載の蓄電セル。 The spacer is composed of a plurality of wall portions and has a rectangular frame shape in the plan view.
The storage cell according to claim 2, wherein the first penetrating portion is provided on the wall portion different from the wall portion provided with the second penetrating portion. 積層された複数の蓄電セルを備え、
前記複数の蓄電セルは、請求項１～請求項３のいずれか一項に記載の蓄電セルを含むことを特徴とする蓄電装置。 Equipped with multiple stacked storage cells
A power storage device comprising the power storage cell according to any one of claims 1 to 3, wherein the plurality of power storage cells include the power storage cell.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7451451B2 (en) 2021-03-08 2024-03-18 株式会社東芝 Electrode groups, bipolar electrode groups, secondary batteries, battery packs, vehicle and stationary power supplies

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7451451B2 (en) 2021-03-08 2024-03-18 株式会社東芝 Electrode groups, bipolar electrode groups, secondary batteries, battery packs, vehicle and stationary power supplies

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