JP7459774B2 - Energy storage cells and energy storage devices - Google Patents
Energy storage cells and energy storage devices Download PDFInfo
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- JP7459774B2 JP7459774B2 JP2020198231A JP2020198231A JP7459774B2 JP 7459774 B2 JP7459774 B2 JP 7459774B2 JP 2020198231 A JP2020198231 A JP 2020198231A JP 2020198231 A JP2020198231 A JP 2020198231A JP 7459774 B2 JP7459774 B2 JP 7459774B2
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Secondary Cells (AREA)
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.
従来、特許文献１に記載される蓄電装置としての蓄電モジュールが知られている。
上記の蓄電モジュールは、電極ユニットが複数積層されることにより構成されている。電極ユニットは、バイポーラ電極と、隣り合うバイポーラ電極とともに空間を区画する樹脂枠とを備えている。空間には、電解液が収容されている。一対の電極が積層される第１方向で樹脂枠を平面視したとき、樹脂枠は、矩形環状をなしている。樹脂枠の１つの辺部には、空間に電解液を注入するための注入口が形成されている。樹脂枠を構成する４つの辺部のうち互いに隣り合う辺部は直交している。注入口は、空間にガスが発生したとき、ガスを蓄電セルの外部に排出する機能も有している。
BACKGROUND ART Conventionally, a power storage module as a power storage device described in Patent Document 1 has been known.
The above-mentioned power storage module is configured by laminating a plurality of electrode units. The electrode unit includes a bipolar electrode and a resin frame that partitions a space together with the adjacent bipolar electrodes. An electrolytic solution is contained in the space. When the resin frame is viewed from above in the first direction in which the pair of electrodes are stacked, the resin frame has a rectangular ring shape. An injection port for injecting electrolyte into the space is formed in one side of the resin frame. Among the four sides constituting the resin frame, adjacent sides are orthogonal to each other. The injection port also has the function of discharging gas to the outside of the electricity storage cell when gas is generated in the space.
蓄電セルの空間に発生したガスを注入口から排出するとき、ガスは、注入口が設けられている樹脂枠の１つの辺部に向けて流動する。このとき、注入口が設けられた辺部と連続している各辺部と、注入口が設けられる辺部との境界にガスが溜まり易くなる虞がある。 When the gas generated in the space of the electricity storage cell is discharged from the injection port, the gas flows toward one side of the resin frame where the injection port is provided. At this time, there is a possibility that gas tends to accumulate at the boundary between each side continuous with the side where the injection port is provided and the side where the injection port is provided.
上記課題を解決する蓄電セルは、互いに対向する活物質層をそれぞれ有し、互いに重なり合う一対の電極と、前記一対の電極の間に介在し、前記活物質層を囲む矩形枠状をなし、且つ前記一対の電極とともに区画する空間を封止する樹脂枠と、を備える蓄電セルであって、前記樹脂枠に設けられ、前記空間と前記蓄電セルの外部とに延びる貫通部と、前記貫通部を閉塞する閉塞部とを備え、前記樹脂枠は、前記貫通部が設けられる第１壁部と、前記第１壁部に直交する方向に延びる第２壁部と、前記第１壁部と前記第２壁部とを接続する接続部と、を有し、前記第１壁部は、前記空間に臨む第１端面を有し、前記第２壁部は、前記空間に臨む第２端面を有し、前記接続部は、前記空間に臨み、且つ前記第１端面と前記第２端面とを接続する変化面を有し、前記変化面は、前記第１端面及び前記第２端面それぞれとなす角度が鈍角となるように前記第１端面及び前記第２端面の間に延びている。 A power storage cell that solves the above problems has active material layers facing each other, a pair of electrodes that overlap each other, and a rectangular frame shape that is interposed between the pair of electrodes and surrounds the active material layer, and A power storage cell comprising: a resin frame that seals a space partitioned together with the pair of electrodes; a penetration portion provided in the resin frame and extending to the space and the outside of the power storage cell; The resin frame includes a first wall portion provided with the penetration portion, a second wall portion extending in a direction perpendicular to the first wall portion, and a first wall portion and the first wall portion. a connecting portion connecting two wall portions, the first wall portion having a first end surface facing the space, and the second wall portion having a second end surface facing the space. , the connecting portion has a transition surface that faces the space and connects the first end surface and the second end surface, and the transition surface has an angle with each of the first end surface and the second end surface. It extends between the first end surface and the second end surface to form an obtuse angle.
これによれば、貫通部が閉塞部で閉塞されていない状態において、蓄電セルの空間に発生したガスを蓄電セルの外部に排出するとき、ガスは貫通部に向けて流動する。このとき、第２端面、変化面、及び第１端面に沿って流動するガスがある。第１端面と第２端面とが変化面で接続されていることから、ガスは、変化面により第２端面から第１端面に円滑に流動し易くなる。そのため、貫通部からガスを排出し易くなり、第１壁部と第２壁部との境界にガスが溜まることを抑制できる。 According to this, when gas generated in the space of the energy storage cell is discharged to the outside of the energy storage cell in a state where the through-hole is not blocked by the blocking portion, the gas flows toward the through-hole. At this time, some of the gas flows along the second end face, the change surface, and the first end face. Because the first end face and the second end face are connected by the change surface, the gas can easily flow smoothly from the second end face to the first end face due to the change surface. Therefore, it becomes easier to discharge the gas from the through-hole, and it is possible to suppress the accumulation of gas at the boundary between the first wall portion and the second wall portion.
上記の蓄電セルにおいて、前記第２壁部は、前記第１壁部が延びる方向である第１延設方向における前記第１壁部の第１端部寄り、及び前記第１延設方向における前記第１壁部の第２端部寄りにそれぞれ設けられ、前記第１端面と、前記第１端部寄りに設けられる前記第２壁部の前記第２端面とは、前記変化面により接続され、前記第１端面と、前記第２端部寄りに設けられる前記第２壁部の前記第２端面とは、前記変化面により接続されているとよい。 In the above-mentioned energy storage cell, the second wall portion is provided near a first end of the first wall portion in a first extension direction, which is a direction in which the first wall portion extends, and near a second end of the first wall portion in the first extension direction, and the first end face and the second end face of the second wall portion provided near the first end are connected by the changing surface, and the first end face and the second end face of the second wall portion provided near the second end are connected by the changing surface.
これによれば、貫通部が閉塞部で閉塞されていない状態において、蓄電セルの空間で発生したガスは、２つの第２壁部にそれぞれ対応して設けられた２つの変化面により第１端面に円滑に流動し易くなる。そのため、貫通部からガスを排出し易くなり、第１壁部と第２壁部との境界にガスが溜まることをより抑制できる。 With this, when the through-hole is not blocked by the blocking portion, gas generated in the space of the storage cell can flow smoothly to the first end face due to the two change surfaces provided corresponding to the two second wall portions, respectively. This makes it easier to exhaust gas from the through-hole, and can better prevent gas from accumulating at the boundary between the first wall portion and the second wall portion.
上記の蓄電セルにおいて、前記樹脂枠は、前記第２壁部の前記第１壁部とは反対側に連続し、前記一対の電極が重なり合う方向である積層方向で見た平面視において前記第１壁部が延びる第１延設方向に延びる第３壁部を有し、前記第１延設方向及び前記積層方向に直交する第１厚さ方向における前記第１壁部の厚さは、前記第２壁部が延びる第２延設方向及び前記積層方向に直交する第２厚さ方向における前記第２壁部の厚さ及び前記第１厚さ方向における前記第３壁部の厚さ以上であるとよい。 In the above-mentioned energy storage cell, the resin frame has a third wall portion that is continuous with the second wall portion on the opposite side to the first wall portion and extends in a first extension direction in which the first wall portion extends when viewed in a plan view in a stacking direction in which the pair of electrodes overlap, and the thickness of the first wall portion in a first thickness direction perpendicular to the first extension direction and the stacking direction is preferably equal to or greater than the thickness of the second wall portion in a second extension direction in which the second wall portion extends and a second thickness direction perpendicular to the stacking direction, and the thickness of the third wall portion in the first thickness direction.
これによれば、第１壁部の第１厚さ方向における厚さは、第２壁部の第２厚さ方向における厚さ及び第３壁部の第３厚さ方向における厚さ以上であり、蓄電セルの内圧に対する剛性が確保されている。そのため、貫通部からガスを排出する際、変化面により第１端面に向けてガスが流動し、貫通部にガスが集中しても、第１壁部の位置における封止性を、第２壁部及び第３壁部と同様に保持できる。 According to this, the thickness of the first wall in the first thickness direction is greater than or equal to the thickness of the second wall in the second thickness direction and the thickness of the third wall in the third thickness direction. , the rigidity against the internal pressure of the storage cell is ensured. Therefore, when gas is discharged from the penetration part, the gas flows toward the first end face due to the changing surface, and even if the gas concentrates in the penetration part, the sealing performance at the position of the first wall part is reduced by the second wall. and the third wall.
上記の蓄電セルにおいて、前記第１壁部は、前記第１壁部が延びる第１延設方向及び前記一対の電極が重なり合う方向である積層方向に直交する第１厚さ方向における厚さが変化しない板状をなし、前記第１延設方向において、前記接続部と前記貫通部とは前記貫通部の前記第１延設方向における幅以上の間隔を隔てて配置されているとよい。 In the above-mentioned energy storage cell, the first wall portion has a plate shape whose thickness does not change in a first thickness direction perpendicular to a first extension direction in which the first wall portion extends and a stacking direction in which the pair of electrodes overlap, and in the first extension direction, the connection portion and the through portion are disposed at a distance equal to or greater than the width of the through portion in the first extension direction.
これによれば、貫通部を設ける位置を第１延設方向においてずらし易くなる。よって、貫通部の配置の自由度が向上する。
上記の蓄電セルにおいて、前記変化面は、前記一対の電極が重なり合う方向である積層方向で見た平面視において、前記第１端面と前記第２端面との間で延びる傾斜面であるとよい。
According to this, it becomes easy to shift the position where the penetration part is provided in the first extension direction. Therefore, the degree of freedom in arranging the penetrating portions is improved.
In the above storage cell, the transition surface may be an inclined surface extending between the first end surface and the second end surface when viewed in plan in the stacking direction, which is the direction in which the pair of electrodes overlap.
これによれば、変化面を曲面とする場合と比較して、変化面を傾斜面とする場合の方が樹脂枠を製造し易い。そのため、蓄電セルの生産性を向上させることができる。よって、ガスを貫通部に誘導し易くしつつ蓄電セルの生産性が向上する。 According to this, it is easier to manufacture the resin frame when the changing surface is a sloped surface than when the changing surface is a curved surface. Therefore, productivity of power storage cells can be improved. Therefore, the productivity of the power storage cell is improved while making it easier to guide gas to the penetrating portion.
上記の蓄電セルにおいて、前記傾斜面は、前記貫通部に至るまで延びているとよい。
これによれば、傾斜面を伝って貫通部に直接的にガスを誘導することができるため、ガス抜きの効率を向上できる。
In the above-mentioned electricity storage cell, the inclined surface may extend up to the penetrating portion.
According to this, gas can be guided directly to the penetrating portion along the inclined surface, so that the efficiency of degassing can be improved.
上記課題を解決する蓄電装置は、複数の蓄電セルを備え、前記複数の蓄電セルは、上記のいずれかの蓄電セルを少なくとも含む。
これによれば、蓄電装置においても、貫通部からガスを排出し易くなり、第１壁部と第２壁部との境界にガスが溜まることを抑制できる。
The power storage device that solves the above problem includes a plurality of power storage cells, and the plurality of power storage cells includes at least any one of the power storage cells described above.
This makes it easier to discharge gas from the through-hole in the electricity storage device as well, and makes it possible to prevent gas from accumulating at the boundary between the first wall portion and the second wall portion.
この発明によれば、貫通部からガスを排出し易くなり、第１壁部と第２壁部との境界にガスが溜まることを抑制できる。 This invention makes it easier to exhaust gas from the penetration, and prevents gas from accumulating at the boundary between the first wall and the second wall.
以下、蓄電セル及び蓄電装置を具体化した一実施形態を図１～図６にしたがって説明する。
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。
Hereinafter, an embodiment of a power storage cell and a power storage device will be described with reference to FIGS.
1, the energy storage device 1 includes a cell stack 2 configured with a plurality of stacked energy storage cells 10. The direction in which the plurality of energy storage cells 10 are stacked is referred to as a stacking direction C.
図２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、樹脂枠５０とを備えている。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. 2, the electricity storage cell 10 includes a positive electrode 20, a negative electrode 30, a separator 40, and a resin frame 50. Viewing the storage cell 10 from the outside in the stacking direction C is called a plan view.
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、及び活物質層としての正極活物質層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。正極集電体２１は、第１面２１ａにおける正極集電体２１の外周縁２１ｃ寄りに位置し、正極活物質層２２が設けられていない外周縁部２１ｄを有する。 The positive electrode 20 is, for example, a rectangular electrode. The positive electrode 20 includes a positive electrode current collector 21 that is rectangular in plan view, and a positive electrode active material layer 22 as an active material layer. 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 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 21 b of the positive electrode current collector 21 . The positive electrode current collector 21 has an outer peripheral edge portion 21d located near the outer peripheral edge 21c of the positive electrode current collector 21 on the first surface 21a, and on which the positive electrode active material layer 22 is not provided.
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、及び活物質層としての負極活物質層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。負極集電体３１は、第１面３１ａにおける負極集電体３１の外周縁３１ｃ寄りに位置し、負極活物質層３２が設けられていない外周縁部３１ｄを有する。なお、正極２０及び負極３０は、活物質層を有する一対の電極の一例である。 The negative electrode 30 is, for example, a rectangular electrode. The negative electrode 30 includes a negative electrode current collector 31 that is rectangular in plan view, and a negative electrode active material layer 32 as an active material layer. The negative electrode current collector 31 has a first surface 31a and a second surface 31b located on the opposite side to 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. The negative electrode current collector 31 has an outer peripheral edge portion 31d located near the outer peripheral edge 31c of the negative electrode current collector 31 on the first surface 31a, and on which the negative electrode active material layer 32 is not provided. Note that the positive electrode 20 and the negative electrode 30 are an example of a pair of electrodes having an active material layer.
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。すなわち、正極活物質層２２と負極活物質層３２とは互いに対向している。セパレータ４０は、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２０と負極３０とが重なり合う方向を積層方向Ａとし、積層方向Ａに直交し、正極集電体２１（負極集電体３１）の平面視中央から外周縁２１ｃ（外周縁３１ｃ）に向かう方向を放射方向Ｂとする。複数の蓄電セル１０の積層方向Ｃと、正極２０と負極３０とが重なり合う積層方向Ａとは一致している。このため、積層方向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 collector 21 and the first surface 31a of the negative electrode collector 31 face each other. That is, the positive electrode active material layer 22 and the negative electrode active material layer 32 face each other. The separator 40 is sandwiched between the positive electrode active material layer 22 and the negative electrode active material layer 32. That is, the positive electrode 20 and the negative electrode 30 overlap with the separator 40 interposed therebetween. The direction in which the positive electrode 20 and the negative electrode 30 overlap is the stacking direction A, and the direction perpendicular to the stacking direction A and extending from the center of the positive electrode collector 21 (negative electrode collector 31) in a plan view toward the outer periphery 21c (outer periphery 31c) is the radial direction B. The stacking direction C of the multiple storage cells 10 and the stacking direction A in which the positive electrode 20 and the negative electrode 30 overlap each other coincide with each other. For this reason, the view of the storage cell 10 in the stacking 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 plan view, the entire region where the positive electrode active material layer 22 is formed is located inside the region where the negative electrode active material layer 32 is formed.
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、積層方向Ａにおいて、正極活物質層２２及び負極活物質層３２に対向していない非対向部４１を有している。 In plan view, the separator 40 has a rectangular shape larger than the area in which the negative electrode active material layer 32 is formed. In plan view, the separator 40 has a rectangular shape smaller than the positive electrode current collector 21 and the negative electrode current collector 31. The separator 40 has a non-facing portion 41 that does not face the positive electrode active material layer 22 and the negative electrode active material layer 32 in the stacking direction A.
図２及び図３に示すように、樹脂枠５０は、正極集電体２１と負極集電体３１との間に位置する。樹脂枠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、樹脂枠５０の材料は、酸変性ポリエチレンである。なお、樹脂枠５０の材料は、酸変性ポリプロピレンであってもよい。 As shown in FIGS. 2 and 3, the resin frame 50 is located between the positive electrode current collector 21 and the negative electrode current collector 31. The resin frame 50 includes an insulating material and prevents a short circuit between the positive electrode current collector 21 and the negative electrode current collector 31 by insulating the positive electrode current collector 21 and the negative electrode current collector 31. In this embodiment, the material of the resin frame 50 is acid-modified polyethylene. Note that the material of the resin frame 50 may be acid-modified polypropylene.
図２に示すように、樹脂枠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。樹脂枠５０は、正極２０と負極３０との間に介在されるように設けられている。樹脂枠５０は、正極活物質層２２及び負極活物質層３２を囲む矩形枠状をなしている。平面視において、樹脂枠５０は、四角枠状をなしている。樹脂枠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。 As shown in FIG. 2, the resin frame 50 is disposed between the outer peripheral edge 21d of the positive electrode current collector 21 and the outer peripheral edge 31d of the negative electrode current collector 31. The resin frame 50 is provided to be interposed between the positive electrode 20 and the negative electrode 30. The resin frame 50 has a rectangular frame shape surrounding the positive electrode active material layer 22 and the negative electrode active material layer 32. In plan view, the resin frame 50 has a rectangular frame shape. The resin frame 50 includes a portion sandwiched between the outer peripheral edge 21d of the positive electrode current collector 21 and the outer peripheral edge 31d of the negative electrode current collector 31, and the outer peripheral edge 21c of the positive electrode current collector 21 and the negative electrode current collector. It has a portion located outside the outer peripheral edge 31c of the body 31.
樹脂枠５０は、積層方向Ａの両端面のうち、正極集電体２１寄りの端面に四角枠状の正極側端面５０ｂを有し、負極集電体３１寄りの端面に四角枠状の負極側端面５０ｃを有する。 Of both end faces in the stacking direction A, the resin frame 50 has a square frame-shaped positive electrode side end face 50b on the end face closer to the positive electrode current collector 21, and a square frame-shaped negative electrode end face 50b on the end face closer to the negative electrode current collector 31. It has an end surface 50c.
樹脂枠５０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る部分を介在部５０ａとする。樹脂枠５０には、介在部５０ａと正極集電体２１との間に非対向部４１を挟む部分と、介在部５０ａと正極集電体２１とが互いに溶着された第１接合部Ｗ１とが形成されている。非対向部４１は、介在部５０ａに溶着されてもよい。 In the resin frame 50, a portion sandwiched between the outer peripheral edge 21d of the positive electrode current collector 21 and the outer peripheral edge 31d of the negative electrode current collector 31 is defined as an intervening portion 50a. The resin frame 50 includes a portion where the non-opposing portion 41 is sandwiched between the interposed portion 50a and the positive electrode current collector 21, and a first joint portion W1 where the interposed portion 50a and the positive electrode current collector 21 are welded to each other. It is formed. The non-opposing portion 41 may be welded to the intervening portion 50a.
第１接合部Ｗ１は、樹脂枠５０の正極側端面５０ｂにおける正極集電体２１の外周縁部２１ｄが重なり合う部分と、正極集電体２１の外周縁部２１ｄとが溶着されて形成されている。第１接合部Ｗ１において、正極側端面５０ｂと、正極集電体２１の外周縁部２１ｄとは全周に亘って溶着されている。そのため、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 first joint W1 is formed by welding the overlapping portion of the outer peripheral edge 21d of the positive electrode collector 21 on the positive electrode side end surface 50b of the resin frame 50 to the outer peripheral edge 21d of the positive electrode collector 21. In the first joint W1, the positive electrode side end surface 50b and the outer peripheral edge 21d of the positive electrode collector 21 are welded around the entire circumference. Therefore, in a plan view, the first joint W1 has a rectangular frame shape.
樹脂枠５０には、介在部５０ａと負極集電体３１とが互いに溶着された第２接合部Ｗ２が形成されている。第２接合部Ｗ２は、樹脂枠５０の負極側端面５０ｃにおける負極集電体３１の外周縁部３１ｄが重なり合う部分と、負極集電体３１の外周縁部３１ｄとが溶着されて形成されている。第２接合部Ｗ２において、負極側端面５０ｃと、負極集電体３１の外周縁部３１ｄとは全周に亘って溶着されている。そのため、平面視において、第２接合部Ｗ２は、四角枠状をなしている。介在部５０ａと正極集電体２１との間に非対向部４１を挟む場合、第２接合部Ｗ２は、第１接合部Ｗ１よりも溶着面積が大きく形成され得る。第１接合部Ｗ１及び第２接合部Ｗ２により蓄電セル１０の正極２０、負極３０、及び樹脂枠５０により区画される空間Ｓのシール性が保たれる。すなわち、樹脂枠５０は、正極２０及び負極３０とともに区画する空間Ｓを封止している。具体的には、空間Ｓは正極集電体２１、負極集電体３１及び樹脂枠５０により区画ならびに封止され、当該空間Ｓ内に正極活物質層２２及び負極活物質層３２が配置されている。 A second joint W2 is formed in the resin frame 50, in which the interposed part 50a and the negative electrode current collector 31 are welded to each other. The second joint W2 is formed by welding a portion of the negative electrode side end surface 50c of the resin frame 50 where the outer peripheral edge 31d of the negative electrode current collector 31 overlaps with the outer peripheral edge 31d of the negative electrode current collector 31. . In the second joint W2, the negative electrode side end surface 50c and the outer peripheral edge 31d of the negative electrode current collector 31 are welded over the entire circumference. Therefore, in plan view, the second joint portion W2 has a rectangular frame shape. When the non-opposed portion 41 is sandwiched between the intervening portion 50a and the positive electrode current collector 21, the second bonded portion W2 may be formed to have a larger welded area than the first bonded portion W1. The sealing performance of the space S defined by the positive electrode 20, the negative electrode 30, and the resin frame 50 of the power storage cell 10 is maintained by the first joint W1 and the second joint W2. That is, the resin frame 50 seals the space S defined together with the positive electrode 20 and the negative electrode 30. Specifically, the space S is divided and sealed by the positive electrode current collector 21, the negative electrode current collector 31, and the resin frame 50, and the positive electrode active material layer 22 and the negative electrode active material layer 32 are arranged within the space S. There is.
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が備える樹脂枠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。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。 As shown in FIG. 1, in the cell stack 2, the multiple storage cells 10 are stacked such that the second surface 21b of the positive electrode collector 21 and the second surface 31b of the negative electrode collector 31 of one storage cell 10 adjacent to each other in the stacking direction C are in contact with each other. The multiple storage cells 10 are electrically connected in series. In the cell stack 2, a pseudo bipolar electrode 13 is formed in which the positive electrode collector 21 and the negative electrode collector 31 that are in contact with each other are used as electrodes by the storage cells 10 adjacent to each other in the stacking direction C. One bipolar electrode 13 includes the positive electrode collector 21, the negative electrode collector 31, the positive electrode active material layer 22, and the negative electrode active material layer 32. In addition, in the resin frame 50 provided for the multiple storage cells 10, the parts located outside the outer periphery 21c of the positive electrode collector 21 and the outer periphery 31c of the negative electrode collector 31 are joined to each other and integrated. This ensures sealing between the positive electrode collector 21 and the negative electrode collector 31 that constitute the bipolar electrode 13 of the energy storage device 1. The positive electrode collector 21 and the positive electrode active material layer 22 are arranged as terminal electrodes at the first end 11 in the stacking direction C of the cell stack 2. The negative electrode collector 31 and the negative electrode active material layer 32 are arranged as terminal electrodes at the second end 12 in the stacking direction C of the energy 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７１及び負極通電板８１からなる一対の通電体を備えている。正極通電板７１及び負極通電板８１は、それぞれ良導電性材料で構成される。正極通電板７１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８１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７１及び負極通電板８１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７１及び負極通電板８１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７１及び負極通電板８１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 current-carrying bodies including a positive electrode current-carrying plate 71 and a negative electrode current-carrying plate 81, which are arranged so as to sandwich the cell stack 2 in the stacking direction C. The positive electrode current-carrying plate 71 and the negative electrode current-carrying plate 81 are each made of a highly conductive material. The positive electrode current-carrying plate 71 is electrically connected to the positive electrode current collector 21 disposed at the outermost side at the first end portion 11 . The negative electrode current-carrying plate 81 is electrically connected to the negative electrode current collector 31 disposed on the outermost side at the second end portion 12 . The power storage device 1 is charged and discharged through terminals (not shown) provided on the positive electrode current-carrying plate 71 and the negative electrode current-carrying plate 81. As the material constituting the positive electrode current carrying plate 71 and the negative electrode current carrying plate 81, the same material as that forming the positive electrode current collector 21 and the negative electrode current collector 31 can be used. The positive electrode current-carrying plate 71 and the negative electrode current-carrying plate 81 may be made of metal plates that are thicker than the positive electrode current collector 21 and the negative electrode current collector 31 used in the electricity 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としてステンレス鋼箔を用いる場合、例えばＪＩＳ Ｇ ４３０５：２０１５にて規定されるＳＵＳ３０４、ＳＵＳ３１６、ＳＵＳ３０１等を用いると、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、上記金属の合金箔又はクラッド箔であってもよい。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 collector 21 and the negative electrode collector 31 are chemically inactive electrical conductors. Examples of materials that can be used for the positive electrode collector 21 and the negative electrode collector 31 include metal materials, conductive resin materials, and conductive inorganic materials. Examples of conductive resin materials include resins in which a conductive filler is added to a conductive polymer material or a non-conductive polymer material as necessary. The positive electrode collector 21 and the negative electrode collector 31 may have multiple layers including one or more layers containing the above-mentioned metal material or conductive resin material. A coating layer may be formed on the surface of the positive electrode collector 21 and the negative electrode collector 31 by a known method such as plating or spray coating. The positive electrode collector 21 and the negative electrode collector 31 may be formed in the form of, for example, a plate, foil, sheet, film, mesh, or the like. When the positive electrode collector 21 and the negative electrode collector 31 are made of metal foil, for example, aluminum foil, copper foil, nickel foil, titanium foil, or stainless steel foil can be used. When using stainless steel foil as the positive electrode collector 21 and the negative electrode collector 31, for example, SUS304, SUS316, SUS301, etc., as specified in JIS G 4305:2015, can be used to ensure the mechanical strength of the positive electrode collector 21 and the negative electrode collector 31. The positive electrode collector 21 and the negative electrode collector 31 may be alloy foil or clad foil of the above metals. In this embodiment, the positive electrode collector 21 is aluminum foil, and the negative electrode collector 31 is copper foil. When the positive electrode collector 21 and the negative electrode 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、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 includes a positive electrode active material that can insert and release charge carriers such as lithium ions. Examples of the positive electrode active material include a lithium ion composite metal oxide having a layered rock salt structure, a metal oxide having a spinel structure, Any material that can be used as a positive electrode active material for lithium ion secondary batteries, such as a polyanion compound, may be used. Furthermore, two or more types of positive electrode active materials may be used in combination. In this embodiment, the positive electrode active material layer 22 includes 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、炭素、金属化合物、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）又はソフトカーボン（易黒鉛化性炭素）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、シリコン（ケイ素）及びスズが挙げられる。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。 Examples of the negative electrode active material layer 32 include a single substance, an alloy, carbon, a metal compound, an element that can be alloyed with lithium, or a compound thereof, which can insert and release charge carriers such as lithium ions. Examples of carbon include natural graphite, artificial graphite, hard carbon (non-graphitizable carbon), and soft carbon (easily graphitizable carbon). Examples of artificial graphite include highly oriented graphite and mesocarbon microbeads. Examples of elements that can be alloyed with lithium include silicon and tin. In this 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。 The positive electrode active material layer 22 and the negative electrode active material layer 32 each contain a conductive agent, a binder, an electrolyte (a polymer matrix, an ion-conductive polymer, an electrolytic solution, etc.), and an ion-conductive material to improve electrical conductivity as necessary. The electrolyte may further contain an electrolyte supporting salt (lithium salt), etc. to improve the properties. The components contained in the active material layer or the blending ratio of the components and the thickness of the active material layer are not particularly limited, and known knowledge regarding lithium ion secondary batteries may 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 provided on the surfaces of the positive electrode current collector 21 and the negative electrode current collector 31 (on one side or both sides) or on the surfaces of the positive electrode active material layer 22 and the negative electrode active material layer 32. may be provided. The heat-resistant layer contains, for example, inorganic particles and a binder, and may also contain additives 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が挙げられる。また、結着剤としては、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、アクリル酸やメタクリル酸などのモノマー単位を含むアクリル系樹脂、スチレン－ブタジエンゴム（ＳＢＲ）が挙げられる。さらに、結着剤としては、カルボキシメチルセルロース、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。 Examples of the conductive aid include acetylene black, carbon black, and graphite. Examples of the binder include fluororesins such as polyvinylidene fluoride, polytetrafluoroethylene, and fluorinated rubber, and thermoplastic resins such as polypropylene and polyethylene. Examples of the binder include imide resins such as polyimide and polyamide, alkoxysilyl group-containing resins, acrylic resins containing monomer units such as acrylic acid and methacrylic acid, and styrene-butadiene rubber (SBR). Furthermore, examples of the binder include alginates such as carboxymethyl cellulose, sodium alginate, and ammonium alginate, water-soluble cellulose ester crosslinked products, and starch-acrylic acid graft polymers. These binders may be used alone or in combination. As the solvent, for example, water, N-methyl-2-pyrodrine (NMP), etc. 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。 The separator 40 allows charge carriers such as lithium ions to pass through while isolating the positive electrode 20 and the negative electrode 30 to prevent short circuits caused by contact between the two electrodes. The separator 40 may be, for example, a porous sheet or nonwoven fabric containing a polymer that absorbs and retains an electrolyte. Examples of materials that constitute 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 multi-layer 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 an electrolyte such as a polymer gel electrolyte or 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が挙げられる。 The electrolyte impregnated into the separator 40 may be, for example, a liquid electrolyte (electrolyte) containing a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent, or a polymer gel electrolyte containing an electrolyte held in a polymer matrix. can be mentioned.
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 electrolyte solution, known lithium salts such as LiClO4 , LiAsF6 , LiPF6 , LiBF4 , LiCF3SO3 , LiN( FSO2 ) 2 , LiN( CF3SO2 ) 2 , etc. can be used as the electrolyte salt. In addition, known solvents such as cyclic carbonates, cyclic esters, chain carbonates, chain esters , ethers, etc. can be used as the non-aqueous solvent. Two or more of these known solvent materials may be used in combination.
図３に示すように、樹脂枠５０は、４つの壁部と、２つの接続部５４とを有している。樹脂枠５０が有する４つの壁部は、第１壁部５１と、２つの第２壁部５２と、第３壁部５３とである。第１壁部５１には、２つの接続部５４が連続している。２つの接続部５４それぞれには、第２壁部５２が連続している。２つの第２壁部５２の第１壁部５１とは反対側には、第３壁部５３が連続している。平面視において、第１壁部５１と第３壁部５３とは平行に延びている。平面視において、２つの第２壁部５２は、平行に延びている。 As shown in FIG. 3, the resin frame 50 has four walls and two connection portions 54. The four walls of the resin frame 50 are a first wall 51, two second walls 52, and a third wall 53. The first wall 51 is continuous with two connection portions 54. The second wall 52 is continuous with each of the two connection portions 54. The third wall 53 is continuous with the two second walls 52 on the side opposite the first wall 51. In a plan view, the first wall 51 and the third wall 53 extend in parallel. In a plan view, the two second walls 52 extend in parallel.
平面視において、２つの第２壁部５２の間で、第１壁部５１が延びる方向を第１延設方向Ｄ１とし、第３壁部５３が延びる方向を第３延設方向Ｄ３とする。平面視において、第１壁部５１と第３壁部５３との間で、２つの第２壁部５２が延びる方向を第２延設方向Ｄ２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。すなわち、２つの第２壁部５２は、第１壁部５１に直交する方向に延びている。第１延設方向Ｄ１と第３延設方向Ｄ３とは平行をなしている。すなわち、第１延設方向Ｄ１と第３延設方向Ｄ３は同じ方向であり、第３壁部５３は、第１延設方向Ｄ１に延びている。第２延設方向Ｄ２と第３延設方向Ｄ３とは直交している。２つの第２壁部５２の一方は、第１延設方向Ｄ１における第１壁部５１の第１端部寄りに設けられている。２つの第２壁部５２の他方は、第１延設方向Ｄ１における第１壁部５１の第２端部寄りに設けられている。 In plan view, between the two second walls 52, the direction in which the first wall 51 extends is defined as a first extension direction D1, and the direction in which the third wall 53 extends is defined as a third extension direction D3. In plan view, the direction in which the two second wall parts 52 extend between the first wall part 51 and the third wall part 53 is defined as a second extension direction D2. The first extending direction D1 and the second extending direction D2 are orthogonal to each other. That is, the two second wall portions 52 extend in a direction perpendicular to the first wall portion 51. The first extending direction D1 and the third extending direction D3 are parallel to each other. That is, the first extending direction D1 and the third extending direction D3 are the same direction, and the third wall portion 53 extends in the first extending direction D1. The second extending direction D2 and the third extending direction D3 are orthogonal to each other. One of the two second wall portions 52 is provided near the first end of the first wall portion 51 in the first extension direction D1. The other of the two second wall portions 52 is provided closer to the second end of the first wall portion 51 in the first extending direction D1.
第１壁部５１と、２つの第２壁部５２と、第３壁部５３と、２つの接続部５４との積層方向Ａにおける厚さは全て同じである。そのため、第１壁部５１と、２つの第２壁部５２と、第３壁部５３と、２つの接続部５４との積層方向Ａにおける両端面のうちの一端面により正極側端面５０ｂが形成され、他端面により負極側端面５０ｃが形成されている。 The first wall portion 51, the two second wall portions 52, the third wall portion 53, and the two connection portions 54 all have the same thickness in the stacking direction A. Therefore, one of both end faces in the stacking direction A of the first wall portion 51, the two second wall portions 52, the third wall portion 53, and the two connection portions 54 forms the positive electrode side end face 50b, and the other end face forms the negative electrode side end face 50c.
図３及び図４に示すように、第１延設方向Ｄ１及び積層方向Ａに直交する方向を第１厚さ方向Ｄｔ１とし、第１厚さ方向Ｄｔ１への第１壁部５１の寸法を厚さＴ１とする。第１壁部５１は、厚さＴ１が変化しない板状をなしている。第１壁部５１は、蓄電セル１０の空間Ｓに臨む第１内面５１ａを有している。第１内面５１ａは、第１厚さ方向Ｄｔ１に直交する面であり、平面視において第１延設方向Ｄ１に延びる面である。第１壁部５１は、第１厚さ方向Ｄｔ１において、第１内面５１ａとは反対側に位置する第１外面５１ｂを有している。第１内面５１ａ及び第１外面５１ｂは平行である。第１内面５１ａは、第１壁部５１の第１端面の一例である。 As shown in FIGS. 3 and 4, the direction perpendicular to the first extension direction D1 and the stacking direction A is the first thickness direction Dt1, and the dimension of the first wall portion 51 in the first thickness direction Dt1 is the thickness. Let it be T1. The first wall portion 51 has a plate shape in which the thickness T1 does not change. The first wall portion 51 has a first inner surface 51a facing the space S of the power storage cell 10. The first inner surface 51a is a surface that is perpendicular to the first thickness direction Dt1 and extends in the first extension direction D1 in plan view. The first wall portion 51 has a first outer surface 51b located on the opposite side to the first inner surface 51a in the first thickness direction Dt1. The first inner surface 51a and the first outer surface 51b are parallel. The first inner surface 51a is an example of the first end surface of the first wall portion 51.
第２延設方向Ｄ２及び積層方向Ａに直交する方向を第２厚さ方向Ｄｔ２とし、第２厚さ方向Ｄｔ２への第２壁部５２の寸法を厚さＴ２とする。第２壁部５２は、厚さＴ２が変化しない板状をなしている。第２壁部５２は、蓄電セル１０の空間Ｓに臨む第２内面５２ａを有している。第２内面５２ａは、第２厚さ方向Ｄｔ２に直交する面であり、平面視において第２延設方向Ｄ２に延びる面である。第２壁部５２は、第２厚さ方向Ｄｔ２において、第２内面５２ａとは反対側に位置する第２外面５２ｂを有している。第２内面５２ａ及び第２外面５２ｂは平行である。第２内面５２ａは、第２壁部５２の第２端面の一例である。 The direction perpendicular to the second extending direction D2 and the stacking direction A is defined as a second thickness direction Dt2, and the dimension of the second wall portion 52 in the second thickness direction Dt2 is defined as a thickness T2. The second wall portion 52 has a plate shape in which the thickness T2 does not change. The second wall portion 52 has a second inner surface 52a facing the space S of the power storage cell 10. The second inner surface 52a is a surface that is perpendicular to the second thickness direction Dt2 and extends in the second extension direction D2 in plan view. The second wall portion 52 has a second outer surface 52b located on the opposite side to the second inner surface 52a in the second thickness direction Dt2. The second inner surface 52a and the second outer surface 52b are parallel. The second inner surface 52a is an example of the second end surface of the second wall portion 52.
第３延設方向Ｄ３及び積層方向Ａに直交する方向を第３厚さ方向Ｄｔ３とし、第３厚さ方向Ｄｔ３における第３壁部５３の寸法を厚さＴ３とする。第１厚さ方向Ｄｔ１と第３厚さ方向Ｄｔ３とは平行をなしている。すなわち、第１厚さ方向Ｄｔ１と第３厚さ方向Ｄｔ３は同じ方向であり、厚さＴ３は、第１厚さ方向Ｄｔ１における第３壁部５３の寸法である。第３壁部５３は、厚さＴ３が変化しない板状をなしている。第３壁部５３は、蓄電セル１０の空間Ｓに臨む第３内面５３ａを有している。第３内面５３ａは、第３厚さ方向Ｄｔ３に直交する面であり、平面視において第３延設方向Ｄ３に延びる面である。第３壁部５３は、第３厚さ方向Ｄｔ３において、第３内面５３ａとは反対側に位置する第３外面５３ｂを有している。第３内面５３ａ及び第３外面５３ｂは平行である。第３内面５３ａは、２つの第２壁部５２の第２内面５２ａと直交している。第３外面５３ｂは、２つの第２壁部５２の第２外面５２ｂと直交している。 A direction perpendicular to the third extending direction D3 and the stacking direction A is a third thickness direction Dt3, and a dimension of the third wall portion 53 in the third thickness direction Dt3 is a thickness T3. The first thickness direction Dt1 and the third thickness direction Dt3 are parallel to each other. That is, the first thickness direction Dt1 and the third thickness direction Dt3 are the same direction, and the thickness T3 is the dimension of the third wall portion 53 in the first thickness direction Dt1. The third wall portion 53 has a plate shape in which the thickness T3 does not change. The third wall portion 53 has a third inner surface 53a facing the space S of the power storage cell 10. The third inner surface 53a is a surface that is perpendicular to the third thickness direction Dt3 and extends in the third extension direction D3 in plan view. The third wall portion 53 has a third outer surface 53b located on the opposite side to the third inner surface 53a in the third thickness direction Dt3. The third inner surface 53a and the third outer surface 53b are parallel. The third inner surface 53a is perpendicular to the second inner surfaces 52a of the two second wall portions 52. The third outer surface 53b is perpendicular to the second outer surfaces 52b of the two second walls 52.
２つの接続部５４の各々は、蓄電セル１０の空間Ｓに臨み、且つ第１内面５１ａと第２内面５２ａとを接続する傾斜面５５を有している。第１内面５１ａと、第１壁部５１の第１延設方向Ｄ１における第１端部寄りに設けられる第２内面５２ａとは傾斜面５５により接続されている。第１内面５１ａと、第１壁部５１の第１延設方向Ｄ１における第２端部寄りに設けられる第２内面５２ａとは傾斜面５５により接続されている。 Each of the two connection parts 54 faces the space S of the storage cell 10 and has an inclined surface 55 that connects the first inner surface 51a and the second inner surface 52a. The first inner surface 51a and the second inner surface 52a provided near the first end of the first wall part 51 in the first extension direction D1 are connected by the inclined surface 55. The first inner surface 51a and the second inner surface 52a provided near the second end of the first wall part 51 in the first extension direction D1 are connected by the inclined surface 55.
平面視において、傾斜面５５は、第１内面５１ａと第２内面５２ａとの間で直線状に延びている。傾斜面５５は、第１内面５１ａとなす角度θ１が鈍角となっている。傾斜面５５は、第２内面５２ａとなす角度θ２が鈍角となっている。傾斜面５５は、第１内面５１ａ及び第２内面５２ａとなす角度が鈍角となる変化面の一例である。 In a plan view, the inclined surface 55 extends linearly between the first inner surface 51a and the second inner surface 52a. The angle θ1 between the inclined surface 55 and the first inner surface 51a is an obtuse angle. The angle θ2 between the inclined surface 55 and the second inner surface 52a is an obtuse angle. The inclined surface 55 is an example of a transition surface in which the angles between the first inner surface 51a and the second inner surface 52a are obtuse angles.
２つの接続部５４の各々は、第１延設方向Ｄ１及び積層方向Ａに延び、且つ第１壁部５１の第１外面５１ｂと滑らかに連続する第１接続面５４ａを有している。２つの接続部５４の各々は、第２延設方向Ｄ２及び積層方向Ａに延び、且つ第２壁部５２の第２外面５２ｂと滑らかに連続する第２接続面５４ｂを有している。第１接続面５４ａと第２接続面５４ｂとは直交している。 Each of the two connecting portions 54 has a first connecting surface 54a that extends in the first extending direction D1 and the stacking direction A and smoothly continues with the first outer surface 51b of the first wall portion 51. Each of the two connecting portions 54 has a second connecting surface 54b that extends in the second extending direction D2 and the stacking direction A and smoothly continues with the second outer surface 52b of the second wall portion 52. The first connection surface 54a and the second connection surface 54b are orthogonal.
樹脂枠５０は、第１壁部５１の第１外面５１ｂと２つの接続部５４の第１接続面５４ａとにより構成される第１側面５１ｓを有する。第１側面５１ｓは、第１延設方向Ｄ１に長辺が延び、且つ積層方向Ａに短辺が延びる矩形状の面である。 The resin frame 50 has a first side surface 51s formed by a first outer surface 51b of the first wall portion 51 and a first connecting surface 54a of the two connecting portions 54. The first side surface 51s is a rectangular surface with a long side extending in the first extension direction D1 and a short side extending in the stacking direction A.
樹脂枠５０は、第２壁部５２の第２外面５２ｂと１つの接続部５４の第２接続面５４ｂとにより構成される２つの第２側面５２ｓを有する。第２側面５２ｓは、第２延設方向Ｄ２に長辺が延び、かつ積層方向Ａに短辺が延びる矩形状の面である。 The resin frame 50 has two second side surfaces 52s formed by the second outer surface 52b of the second wall portion 52 and the second connection surface 54b of one connection portion 54. The second side surface 52s is a rectangular surface with a long side extending in the second extension direction D2 and a short side extending in the stacking direction A.
第３外面５３ｂは、第３延設方向Ｄ３に長辺が延び、かつ積層方向Ａに短辺が延びる矩形状の面である。
第１壁部５１の厚さＴ１は、第２壁部５２の厚さＴ２と同じである。第１壁部５１の厚さＴ１は、第３壁部５３の厚さＴ３と同じである。第２壁部５２の厚さＴ２は、第３壁部５３の厚さＴ３と同じである。第１壁部５１の厚さＴ１は、第２壁部５２の厚さＴ２よりも厚くても良い。第１壁部５１の厚さＴ１は、第３壁部５３の厚さＴ３よりも厚くても良い。
The third outer surface 53b is a rectangular surface with long sides extending in the third extension direction D3 and short sides extending in the stacking direction A.
The thickness T1 of the first wall portion 51 is the same as the thickness T2 of the second wall portion 52. The thickness T1 of the first wall portion 51 is the same as the thickness T3 of the third wall portion 53. The thickness T2 of the second wall portion 52 is the same as the thickness T3 of the third wall portion 53. The thickness T1 of the first wall portion 51 may be thicker than the thickness T2 of the second wall portion 52. The thickness T1 of the first wall portion 51 may be thicker than the thickness T3 of the third wall portion 53.
図４に示すように、平面視において、２つの接続部５４の第１厚さ方向Ｄｔ１への厚さは、第１壁部５１の厚さＴ１以上である。平面視において、２つの接続部５４は、第１延設方向Ｄ１で第２壁部５２から第１壁部５１に向かうほど、第１厚さ方向Ｄｔ１における厚さが第１壁部５１の厚さＴ１と一致するように薄くなる。 As shown in FIG. 4, the thickness of the two connecting portions 54 in the first thickness direction Dt1 is greater than or equal to the thickness T1 of the first wall portion 51 in plan view. In plan view, the thickness of the two connecting portions 54 in the first thickness direction Dt1 increases from the thickness of the first wall portion 51 as it goes from the second wall portion 52 to the first wall portion 51 in the first extension direction D1. It becomes thinner to match T1.
平面視において、２つの接続部５４の第２厚さ方向Ｄｔ２への厚さは、第２壁部５２の厚さＴ２以上である。平面視において、２つの接続部５４は、第２延設方向Ｄ２で第１壁部５１から第２壁部５２に向かうほど、第２厚さ方向Ｄｔ２における厚さが第２壁部５２の厚さＴ２と一致するように薄くなる。 In plan view, the thickness of the two connecting portions 54 in the second thickness direction Dt2 is greater than or equal to the thickness T2 of the second wall portion 52. In plan view, the thickness of the two connecting portions 54 in the second thickness direction Dt2 increases from the thickness of the second wall portion 52 as it goes from the first wall portion 51 to the second wall portion 52 in the second extending direction D2. It becomes thinner to match T2.
すなわち、２つの傾斜面５５の各々は、平面視において、第１延設方向Ｄ１で第２壁部５２から第１壁部５１に向かうほど第１厚さ方向Ｄｔ１における接続部５４の厚さが薄くなるように設けられている。また、２つの傾斜面５５の各々は、平面視において、第２延設方向Ｄ２で第１壁部５１から第２壁部５２に向かうほど第２厚さ方向Ｄｔ２における接続部５４の厚さが薄くなるように設けられている。蓄電セル１０を第１厚さ方向Ｄｔ１で見たとき、２つの傾斜面５５の各々と第１内面５１ａとの境界と、負極活物質層３２の第１延設方向Ｄ１における両端縁とは一致する。 That is, each of the two inclined surfaces 55 is provided so that the thickness of the connection portion 54 in the first thickness direction Dt1 becomes thinner in the first extension direction D1 from the second wall portion 52 toward the first wall portion 51. Also, each of the two inclined surfaces 55 is provided so that the thickness of the connection portion 54 in the second thickness direction Dt2 becomes thinner in the second extension direction D2 from the first wall portion 51 toward the second wall portion 52. When the storage cell 10 is viewed in the first thickness direction Dt1, the boundaries between each of the two inclined surfaces 55 and the first inner surface 51a coincide with both end edges of the negative electrode active material layer 32 in the first extension direction D1.
図２及び図３に示すように、樹脂枠５０は、貫通部６０と、閉塞部７０とを備えている。貫通部６０は、第１壁部５１に設けられている。貫通部６０は、第１壁部５１を貫通する貫通孔である。貫通部６０は、第１壁部５１を第１厚さ方向Ｄｔ１に貫通している。本実施形態では、第１壁部５１における貫通部６０の貫通方向Ｄｐは、第１厚さ方向Ｄｔ１と一致する。なお、第１延設方向Ｄ１は、貫通方向Ｄｐに直交する。第２延設方向Ｄ２は、貫通方向Ｄｐと一致している。そのため、一対の第２壁部５２は、貫通方向Ｄｐに延びている。第３延設方向Ｄ３は、貫通方向Ｄｐに直交する。貫通部６０は、積層方向Ａにおいて、セパレータ４０よりも負極３０側に設けられる。したがって、貫通部６０は、貫通方向Ｄｐにおいて負極活物質層３２と対向している。なお、貫通部６０は、積層方向Ａにおいて、セパレータ４０よりも正極２０側に設けられても良い。 2 and 3, the resin frame 50 has a through portion 60 and a blocking portion 70. The through portion 60 is provided in the first wall portion 51. The through portion 60 is a through hole that penetrates the first wall portion 51. The through portion 60 penetrates the first wall portion 51 in the first thickness direction Dt1. In this embodiment, the through direction Dp of the through portion 60 in the first wall portion 51 coincides with the first thickness direction Dt1. The first extension direction D1 is perpendicular to the through direction Dp. The second extension direction D2 coincides with the through direction Dp. Therefore, the pair of second wall portions 52 extend in the through direction Dp. The third extension direction D3 is perpendicular to the through direction Dp. The through portion 60 is provided on the negative electrode 30 side relative to the separator 40 in the stacking direction A. Therefore, the through portion 60 faces the negative electrode active material layer 32 in the through direction Dp. The through-hole 60 may be provided closer to the positive electrode 20 than the separator 40 in the stacking direction A.
貫通部６０は、第１延設方向Ｄ１及び積層方向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。貫通部６０は、第１厚さ方向Ｄｔ１において、蓄電セル１０の空間Ｓと蓄電セル１０の外部との間で放射方向Ｂに延びている。貫通部６０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を有している。なお、貫通部６０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も有してもよい。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。なお、貫通部６０を第１延設方向Ｄ１及び積層方向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。貫通部６０の形状は、適宜変更してもよい。 The through-hole 60 has a rectangular cross section when cut along a virtual plane extending in the first extension direction D1 and the stacking direction A. The through-hole 60 extends in the radial direction B between the space S of the storage cell 10 and the outside of the storage cell 10 in the first thickness direction Dt1. The through-hole 60 has a function as a gas outlet that discharges gas generated inside the storage cell 10 to the outside of the storage cell 10 after the electrolyte is injected into the space S of the storage cell 10. The through-hole 60 may also have a function as an injection port provided for injecting the electrolyte into the space S of the storage cell 10. The gas generated inside the storage cell 10 refers to air remaining before the electrolyte is injected into the storage cell 10 and gas generated during the initial charge and discharge of the storage device 1. The cross section when the through-hole 60 is cut along a virtual plane extending in the first extension direction D1 and the stacking direction A is not limited to a rectangular shape and may be a circular shape. The shape of the through-hole 60 may be changed as appropriate.
閉塞部７０は、樹脂部材である。閉塞部７０は、貫通部６０を閉塞している。閉塞部７０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、閉塞部７０により貫通部６０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、閉塞部７０により貫通部６０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 blocking portion 70 is a resin member. The blocking portion 70 blocks the through portion 60. The blocking portion 70 is a sealing member that prevents the electrolyte injected into the inside of the storage cell 10 from leaking out to the outside of the storage cell 10. Therefore, the electrolyte is injected into the space S of the storage cell 10 before the through portion 60 is blocked by the blocking portion 70. In addition, gas generated inside the storage cell 10 is discharged to the outside of the storage cell 10 before the through portion 60 is blocked by the blocking portion 70.
図３及び図４に示すように、平面視において、貫通部６０の第１延設方向Ｄ１における幅は、第１壁部５１における２つの接続部５４間の長さよりも小さい。平面視において、２つの接続部５４の各々と、貫通部６０とは、第１延設方向Ｄ１で貫通部６０の第１延設方向Ｄ１における幅以上の間隔を隔てて配置されている。具体的には、第１延設方向Ｄ１において、貫通部６０から２つの接続部５４の各々までの第１壁部５１の長さは、貫通部６０の第１延設方向Ｄ１における幅以上である。なお、本実施形態の作用の説明の便宜上、図３及び図４には、閉塞部７０をあえて記載していない。 As shown in FIGS. 3 and 4, in plan view, the width of the penetrating portion 60 in the first extending direction D1 is smaller than the length between the two connecting portions 54 in the first wall portion 51. In plan view, each of the two connecting portions 54 and the penetrating portion 60 are spaced apart from each other in the first extending direction D1 by a distance greater than the width of the penetrating portion 60 in the first extending direction D1. Specifically, in the first extending direction D1, the length of the first wall portion 51 from the penetrating portion 60 to each of the two connecting portions 54 is greater than or equal to the width of the penetrating portion 60 in the first extending direction D1. be. Note that, for convenience of explanation of the operation of this embodiment, the closing portion 70 is intentionally not shown in FIGS. 3 and 4.
図４に示すように、本実施形態において、蓄電装置１を構成するための蓄電セル１０は、３種類採用されている。３種類の蓄電セル１０の違いは、図４の破線で示すように第１延設方向Ｄ１における貫通部６０の位置の違いである。図４の破線で示される貫通部６０のうち、第１壁部５１の第１端部寄りに位置する貫通部を貫通部６０ａとし、第１壁部５１の第２端部寄りに位置する貫通部を貫通部６０ｂとする。平面視において、貫通部６０，６０ａ，６０ｂは互いに重なっていない。蓄電装置１は、貫通部６０を有する蓄電セル１０と、貫通部６０ａを有する蓄電セル１０と、貫通部６０ｂを有する蓄電セル１０との３種類の蓄電セル１０が積層されることにより構成されている。 As shown in FIG. 4, in this embodiment, three types of storage cells 10 are used to configure the energy storage device 1. The difference between the three types of storage cells 10 is the difference in the position of the through-hole 60 in the first extension direction D1, as shown by the dashed lines in FIG. 4. Of the through-holes 60 shown by the dashed lines in FIG. 4, the through-hole located near the first end of the first wall portion 51 is referred to as through-hole 60a, and the through-hole located near the second end of the first wall portion 51 is referred to as through-hole 60b. In a plan view, the through-holes 60, 60a, and 60b do not overlap with each other. The energy storage device 1 is configured by stacking three types of storage cells 10: a storage cell 10 having a through-hole 60, a storage cell 10 having a through-hole 60a, and a storage cell 10 having a through-hole 60b.
貫通部６０ａを有する蓄電セル１０では、第１延設方向Ｄ１において、第１壁部５１の第２端部寄りの接続部５４と、貫通部６０ａとは、貫通部６０の第１延設方向Ｄ１における幅以上の間隔を隔てて配置されている。貫通部６０ｂを有する蓄電セル１０では、第１延設方向Ｄ１において、第１壁部５１の第１端部寄りの接続部５４と、貫通部６０ｂとは、貫通部６０の第１延設方向Ｄ１における幅以上の間隔を隔てて配置されている。具体的には、貫通部６０ａを有する蓄電セル１０では、第１延設方向Ｄ１において、貫通部６０ａから第１壁部５１の第２端部寄りの接続部５４までの第１壁部５１の長さは、貫通部６０の第１延設方向Ｄ１における幅と、貫通部６０ｂの第１延設方向Ｄ１における幅との和以上である。貫通部６０ｂを有する蓄電セル１０では、第１延設方向Ｄ１において、貫通部６０ｂから第１壁部５１の第１端部寄りの接続部５４までの第１壁部５１の長さは、貫通部６０の第１延設方向Ｄ１における幅と、貫通部６０ａの第１延設方向Ｄ１における幅との和以上である。 In the power storage cell 10 having the penetration part 60a, the connection part 54 near the second end of the first wall part 51 and the penetration part 60a are connected in the first extension direction D1 of the penetration part 60. They are arranged at intervals equal to or greater than the width in D1. In the power storage cell 10 having the penetration part 60b, the connection part 54 near the first end of the first wall part 51 and the penetration part 60b are connected in the first extension direction D1 of the penetration part 60. They are arranged at intervals equal to or greater than the width in D1. Specifically, in the energy storage cell 10 having the penetration part 60a, the length of the first wall part 51 from the penetration part 60a to the connection part 54 near the second end of the first wall part 51 in the first extension direction D1. The length is greater than or equal to the sum of the width of the penetrating portion 60 in the first extending direction D1 and the width of the penetrating portion 60b in the first extending direction D1. In the energy storage cell 10 having the penetration part 60b, the length of the first wall part 51 from the penetration part 60b to the connection part 54 near the first end of the first wall part 51 in the first extension direction D1 is The width is greater than or equal to the sum of the width of the portion 60 in the first extending direction D1 and the width of the penetrating portion 60a in the first extending direction D1.
第１延設方向Ｄ１において、第１壁部５１の第１端部寄りの接続部５４と、貫通部６０ａとは、貫通部６０の第１延設方向Ｄ１における幅以上の間隔を隔てて配置されていなくてもよい。貫通部６０ｂを有する蓄電セル１０では、第１延設方向Ｄ１において、第１壁部５１の第２端部寄りの接続部５４と、貫通部６０ｂとは、貫通部６０の第１延設方向Ｄ１における幅以上の間隔を隔てて配置されていなくてもよい。なお、貫通部６０，６０ａ，６０ｂの第１延設方向Ｄ１における幅は同じである。 In the first extending direction D1, the connecting portion 54 near the first end of the first wall portion 51 and the penetrating portion 60a are spaced apart from each other by a distance greater than the width of the penetrating portion 60 in the first extending direction D1. It doesn't have to be done. In the power storage cell 10 having the penetration part 60b, the connection part 54 near the second end of the first wall part 51 and the penetration part 60b are connected in the first extension direction D1 of the penetration part 60. They do not need to be arranged at intervals equal to or greater than the width in D1. Note that the widths of the penetrating portions 60, 60a, and 60b in the first extending direction D1 are the same.
図６に示すように、蓄電装置１において、隣り合う蓄電セル１０が有する貫通部６０，６０ａ，６０ｂは、積層方向Ｃで重ならないように配置されている。
本実施形態の作用を説明する。
As shown in FIG. 6 , in the energy storage device 1 , the through portions 60 , 60 a , 60 b of adjacent energy storage cells 10 are arranged so as not to overlap in the stacking direction C.
The operation of this embodiment will now be described.
図４に示すように、貫通部６０が閉塞部７０で閉塞されていない状態において、蓄電セル１０の空間Ｓには、貫通部６０を介して電解質が注入される。注入された電解質は、図４中の矢印で示すように、空間Ｓを第３壁部５３に向けて流動し、電解質の一部は、第１壁部５１の第１内面５１ａと、２つの傾斜面５５と、２つの第２内面５２ａとを伝う。空間Ｓに充填された電解質は、負極活物質層３２に含侵しつつ図２に示すセパレータ４０にも含侵される。セパレータ４０に含侵された電解質は、正極活物質層２２にも含侵される。 As shown in FIG. 4 , an electrolyte is injected into the space S of the electricity storage cell 10 through the penetration part 60 in a state where the penetration part 60 is not closed by the closure part 70 . The injected electrolyte flows through the space S toward the third wall 53, as shown by the arrow in FIG. It runs along the inclined surface 55 and the two second inner surfaces 52a. The electrolyte filled in the space S impregnates the negative electrode active material layer 32 and also the separator 40 shown in FIG. 2 . The electrolyte impregnated into the separator 40 is also impregnated into the positive electrode active material layer 22.
図５に示すように、蓄電セル１０の内部にガスが発生した場合、貫通部６０が閉塞部７０によって閉塞されていない状態において、ガス抜き装置を用いて貫通部６０から蓄電セル１０の外部にガスを吸引する。蓄電セル１０の内部のガスは、図５の矢印で示すように、空間Ｓを第１壁部５１に向けて流動し、ガスの一部は２つの第２内面５２ａ、及び２つの傾斜面５５を伝って第１壁部５１に向けて吸引される。第１壁部５１に向けて吸引されたガスは、貫通部６０を介して蓄電セル１０の外部に排出される。第１壁部５１と、２つの第２壁部５２との間には、傾斜面５５を有する接続部５４が設けられているため、ガスが第１壁部５１と第２壁部５２との境界に溜まり難い。 As shown in FIG. 5, when gas is generated inside the electricity storage cell 10, a gas venting device is used to remove gas from the penetration part 60 to the outside of the electricity storage cell 10 while the penetration part 60 is not closed by the closing part 70. Inhale the gas. The gas inside the electricity storage cell 10 flows through the space S toward the first wall 51, as shown by the arrows in FIG. and is sucked toward the first wall portion 51. The gas sucked toward the first wall portion 51 is discharged to the outside of the power storage cell 10 via the penetration portion 60. Since a connecting portion 54 having an inclined surface 55 is provided between the first wall portion 51 and the two second wall portions 52, the gas flows between the first wall portion 51 and the second wall portion 52. Difficult to accumulate on the border.
本実施形態の効果を説明する。
（１）貫通部６０が閉塞部７０で閉塞されていない状態において、蓄電セル１０の空間Ｓに発生したガスを蓄電セル１０の外部に排出するとき、ガスは貫通部６０に向けて流動する。このとき、第２内面５２ａ、傾斜面５５、及び第１内面５１ａに沿って流動するガスがある。第１内面５１ａと第２内面５２ａとが傾斜面５５で接続されていることから、ガスは、傾斜面５５により第２内面５２ａから第１内面５１ａに円滑に流動し易くなる。そのため、貫通部６０からガスを排出し易くなり、第１壁部５１と第２壁部５２との境界にガスが溜まることを抑制できる。
The effects of this embodiment will be described.
(1) In a state where the through-hole 60 is not blocked by the blocking portion 70, when gas generated in the space S of the energy storage cell 10 is discharged to the outside of the energy storage cell 10, the gas flows toward the through-hole 60. At this time, some of the gas flows along the second inner surface 52a, the inclined surface 55, and the first inner surface 51a. Since the first inner surface 51a and the second inner surface 52a are connected by the inclined surface 55, the gas can be easily caused to flow smoothly from the second inner surface 52a to the first inner surface 51a by the inclined surface 55. Therefore, the gas can be easily discharged from the through-hole 60, and accumulation of gas at the boundary between the first wall portion 51 and the second wall portion 52 can be suppressed.
（２）蓄電セル１０の内部で発生したガスは、２つの第２壁部５２にそれぞれ対応して設けられた２つの傾斜面５５により第１内面５１ａに向けて円滑に流動し易くなる。そのため、貫通部６０からガスを排出し易くなり、第１壁部５１と第２壁部５２との境界にガスが溜まることをより抑制できる。 (2) The gas generated inside the electricity storage cell 10 easily flows smoothly toward the first inner surface 51a due to the two inclined surfaces 55 provided correspondingly to the two second walls 52. Therefore, gas can be easily discharged from the penetrating portion 60, and accumulation of gas at the boundary between the first wall portion 51 and the second wall portion 52 can be further suppressed.
（３）第１壁部５１の厚さＴ１は、第２壁部５２の厚さＴ２及び第３壁部５３の厚さＴ３以上であり、蓄電セル１０の内圧に対する剛性が確保されている。そのため、貫通部６０からガスを排出する際、傾斜面５５により第１内面５１ａに向けてガスが流動し、貫通部６０にガスが集中しても、第１壁部５１の位置における封止性を、第２壁部５２及び第３壁部５３と同様に保持できる。 (3) The thickness T1 of the first wall portion 51 is greater than or equal to the thickness T2 of the second wall portion 52 and the thickness T3 of the third wall portion 53, and rigidity against the internal pressure of the electricity storage cell 10 is ensured. Therefore, when gas is discharged from the penetration part 60, even if the gas flows toward the first inner surface 51a due to the inclined surface 55 and concentrates in the penetration part 60, the sealing property at the position of the first wall part 51 is maintained. can be held in the same way as the second wall portion 52 and the third wall portion 53.
（４）平面視において、第１壁部５１は、厚さＴ１が変化しない板状をなしている。そして、平面視において、２つの接続部５４と、貫通部６０とは、第１延設方向Ｄ１で貫通部６０の第１延設方向Ｄ１における幅以上の間隔を隔てて配置されている。そのため、貫通部６０を設ける位置を第１延設方向Ｄ１においてずらし易くなる。よって、貫通部６０の配置の自由度が向上する。 (4) In plan view, the first wall portion 51 is in the form of a plate whose thickness T1 does not change. In plan view, the two connection portions 54 and the through portion 60 are disposed in the first extension direction D1 at a distance equal to or greater than the width of the through portion 60 in the first extension direction D1. This makes it easier to shift the position at which the through portion 60 is disposed in the first extension direction D1. This improves the degree of freedom in arranging the through portion 60.
（５）変化面を曲面とする場合と比較して、変化面を傾斜面５５とする場合の方が樹脂枠５０を製造し易い。そのため、蓄電セルの生産性を向上させることができる。よって、ガスを貫通部に誘導し易くしつつ蓄電セルの生産性が向上する。 (5) Compared to the case where the changing surface is a curved surface, it is easier to manufacture the resin frame 50 when the changing surface is the sloped surface 55. Therefore, productivity of power storage cells can be improved. Therefore, the productivity of the power storage cell is improved while making it easier to guide gas to the penetrating portion.
（６）本実施形態では、第１壁部５１と第２壁部５２との境界にガスが溜まることが抑制されることで、例えば蓄電装置１の製造時において、ガスの排出にかかる時間を短縮し、生産性を向上できる。また、蓄電セル１０の内部にガスが残った状態であると、電池反応が阻害されて電池性能が低下するおそれがある一方、本実施形態の蓄電装置１及び蓄電セル１０によればガスが溜まることを抑制できる。そのため、電池性能の低下を抑制できる。特に、ガスの排出を促すために貫通部６０が設けられた第１壁部５１周辺を除いて蓄電セル１０を積層方向Ａに拘束しながらガスの排出を行う場合、第１壁部５１と第２壁部５２との境界にガスが溜まって内圧が上昇し、正極集電体２１、負極集電体３１、及び樹脂枠５０に応力がかかることを抑制できる。 (6) In the present embodiment, by suppressing the accumulation of gas at the boundary between the first wall portion 51 and the second wall portion 52, the time required for discharging the gas is reduced, for example, when manufacturing the power storage device 1. It can be shortened and productivity can be improved. Further, if gas remains inside the electricity storage cell 10, the battery reaction may be inhibited and the battery performance may deteriorate. However, according to the electricity storage device 1 and the electricity storage cell 10 of the present embodiment, the gas may accumulate can be suppressed. Therefore, deterioration in battery performance can be suppressed. In particular, when gas is discharged while restraining the electricity storage cell 10 in the stacking direction A except for the vicinity of the first wall 51 where the penetration part 60 is provided to promote gas discharge, the first wall 51 and the first wall 51 are It is possible to suppress stress from being applied to the positive electrode current collector 21, the negative electrode current collector 31, and the resin frame 50 due to gas accumulation at the boundary between the two wall portions 52 and an increase in internal pressure.
（７）蓄電装置１において、積層方向Ｃで隣り合う蓄電セル１０の有する貫通部６０は、第１壁部５１に配置されているが、積層方向Ｃで重なり合っていない。そのため、蓄電装置１において、貫通部６０を介してガスを排出するときや電解液を注入するときに、それぞれの貫通部６０に接続されるノズル等が互いに干渉し難くなる。したがって、蓄電装置１の生産性を向上できる。 (7) In the power storage device 1, the penetration parts 60 of the power storage cells 10 adjacent in the stacking direction C are arranged in the first wall part 51, but do not overlap in the stacking direction C. Therefore, in the power storage device 1, when discharging gas or injecting electrolyte through the penetration parts 60, the nozzles and the like connected to the respective penetration parts 60 are less likely to interfere with each other. Therefore, productivity of power storage device 1 can be improved.
なお、本実施形態は、以下のように変更して実施できる。本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。
○ 蓄電セル１０の樹脂枠５０は、図７及び図８のように変更してもよい。
This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.
The resin frame 50 of the energy storage cell 10 may be modified as shown in FIGS.
図７及び図８に示すように、傾斜面５５を貫通部６０に至るまで延ばしてもよい。この場合、第１壁部５１の第１延設方向Ｄ１における幅は、貫通部６０の第１延設方向Ｄ１における幅とほぼ等しくなる。蓄電セル１０を第１厚さ方向Ｄｔ１で見たとき、第１延設方向Ｄ１において、２つの傾斜面５５の各々と第１内面５１ａとの境界は、負極活物質層３２の第１延設方向Ｄ１における両端縁よりも内側に位置している。 As shown in Figures 7 and 8, the inclined surface 55 may be extended up to the through-hole 60. In this case, the width of the first wall portion 51 in the first extension direction D1 is approximately equal to the width of the through-hole 60 in the first extension direction D1. When the storage cell 10 is viewed in the first thickness direction Dt1, the boundaries between each of the two inclined surfaces 55 and the first inner surface 51a in the first extension direction D1 are located inside both end edges of the negative electrode active material layer 32 in the first extension direction D1.
このように変更することにより、傾斜面５５を伝って貫通部６０に直接的にガスを誘導することができるため、ガス抜きの効率を向上できる。
○ 平面視において、２つの接続部５４の空間Ｓに臨む面の形状を図９のように変更してもよい。
By making this change, gas can be guided directly to the penetrating portion 60 along the inclined surface 55, so that the efficiency of degassing can be improved.
○ In plan view, the shapes of the surfaces of the two connecting portions 54 facing the space S may be changed as shown in FIG. 9.
図９に示すように、平面視において、２つの接続部５４の空間Ｓに臨む面は、曲面５６を含んでいる。曲面５６は、平面視において、第１延設方向Ｄ１で第２壁部５２から第１壁部５１に向かうほど第１厚さ方向Ｄｔ１における接続部５４の厚さが第１壁部５１の厚さＴ１と一致するように薄くなるように設けられている。また、曲面５６は、平面視において、第２延設方向Ｄ２で第１壁部５１から第２壁部５２に向かうほど第２厚さ方向Ｄｔ２における接続部５４の厚さが第２壁部５２の厚さＴ２と一致するように薄くなるように設けられている。 As shown in FIG. 9, the surfaces of the two connecting portions 54 facing the space S include a curved surface 56 in plan view. In plan view, the thickness of the connecting portion 54 in the first thickness direction Dt1 increases from the thickness of the first wall portion 51 toward the first wall portion 51 from the second wall portion 52 in the first extending direction D1. It is provided so that it becomes thin so as to match the length T1. Further, in plan view, the thickness of the connecting portion 54 in the second thickness direction Dt2 increases from the first wall portion 51 to the second wall portion 52 in the second extension direction D2. It is provided to be thin so as to match the thickness T2 of.
曲面５６は、接続部５４の空間Ｓに臨む面のうち、平面視において、第１壁部５１の第１内面５１ａと、曲面５６上の任意の位置Ｐを通過しつつ曲面５６に接する仮想面Ｌとのなす角度θ１が鈍角をなす部位である。また、曲面５６は、接続部５４の空間Ｓに臨む面のうち、平面視において、第２壁部５２の第２内面５２ａと、曲面５６上の任意の位置Ｐを通過しつつ曲面５６に接する仮想面Ｌとのなす角度θ２が鈍角をなす部位である。 The curved surface 56 is a portion of the surface of the connection portion 54 facing the space S, where the angle θ1 between the first inner surface 51a of the first wall portion 51 and an imaginary surface L that passes through an arbitrary position P on the curved surface 56 and touches the curved surface 56 is an obtuse angle in a plan view. The curved surface 56 is a portion of the surface of the connection portion 54 facing the space S, where the angle θ2 between the second inner surface 52a of the second wall portion 52 and an imaginary surface L that passes through an arbitrary position P on the curved surface 56 and touches the curved surface 56 is an obtuse angle in a plan view.
○ 貫通部６０は、第１壁部５１を第１厚さ方向Ｄｔ１に貫通している貫通孔であったが、これに限らない。例えば、図１０のように変更してもよい。
図１０に示すように、貫通部６０は、負極側端面５０ｃから凹む凹状の溝であってもよい。貫通部６０は、放射方向Ｂにおいて、蓄電セル１０の空間Ｓから蓄電セル１０の外部に延びている。貫通部６０の積層方向Ａにおける開口の一部は、負極集電体３１の第１面３１ａにより閉塞されている。すなわち、貫通部６０と負極集電体３１の第１面３１ａとにより放射方向Ｂに延びる貫通孔が形成されている。貫通部６０には、筒部材９０が設けられている。筒部材９０の第１端は、蓄電セル１０の空間Ｓに位置し、筒部材９０の第２端は、蓄電セル１０の外部に延びている。筒部材９０の内部は、封止樹脂９１により閉塞されている。すなわち、筒部材９０及び封止樹脂９１は、閉塞部の一例である。なお、本変更例において、蓄電セル１０の空間Ｓに電解質を注入する場合、封止樹脂９１が筒部材９０を閉塞していない状態で、筒部材９０の内部に注入ノズルを挿入する。そして、注入ノズル及び筒部材９０を介して蓄電セル１０の空間Ｓに電解質が注入される。また、蓄電セル１０の内部に発生したガスを、蓄電セル１０の外部に排出する場合、筒部材９０を介して蓄電セル１０の外部にガスを排出する。
Although the penetrating portion 60 is a through hole penetrating the first wall portion 51 in the first thickness direction Dt1, the present invention is not limited thereto. For example, it may be changed as shown in FIG.
As shown in FIG. 10, the penetrating portion 60 may be a concave groove recessed from the negative electrode side end surface 50c. Penetration portion 60 extends in radial direction B from space S of power storage cell 10 to the outside of power storage cell 10 . A part of the opening of the penetrating portion 60 in the stacking direction A is closed by the first surface 31a of the negative electrode current collector 31. That is, a through hole extending in the radial direction B is formed by the through part 60 and the first surface 31a of the negative electrode current collector 31. A cylindrical member 90 is provided in the penetrating portion 60 . A first end of the cylindrical member 90 is located in the space S of the power storage cell 10 , and a second end of the cylindrical member 90 extends outside the power storage cell 10 . The inside of the cylindrical member 90 is closed with a sealing resin 91. That is, the cylinder member 90 and the sealing resin 91 are an example of a closing part. In this modification, when injecting the electrolyte into the space S of the electricity storage cell 10, the injection nozzle is inserted into the cylindrical member 90 while the sealing resin 91 does not close the cylindrical member 90. Then, the electrolyte is injected into the space S of the electricity storage cell 10 via the injection nozzle and the cylindrical member 90. Further, when gas generated inside the power storage cell 10 is discharged to the outside of the power storage cell 10, the gas is discharged to the outside of the power storage cell 10 via the cylindrical member 90.
○ 本実施形態において、平面視において、２つの接続部５４の厚さを常に一定にしてもよい。２つの接続部５４の空間Ｓに臨む面が傾斜面５５もしくは曲面５６であればよい。この場合、第１接続面５４ａ及び第２接続面５４ｂが傾斜面５５もしくは曲面５６に沿う傾斜面もしくは曲面として形成される。 In the present embodiment, the thickness of the two connecting portions 54 may always be constant in plan view. It is only necessary that the surfaces of the two connecting portions 54 facing the space S be the inclined surfaces 55 or the curved surfaces 56. In this case, the first connecting surface 54a and the second connecting surface 54b are formed as inclined surfaces or curved surfaces along the inclined surface 55 or the curved surface 56.
○ 樹脂枠５０は、２つの接続部５４を有していたが、いずれか一方を割愛してもよい。
○ 貫通部６０は、第１厚さ方向Ｄｔ１において第１壁部５１を貫通していたが、これに限らない。例えば、第１厚さ方向Ｄｔ１と貫通部６０の貫通方向Ｄｐが一致しなくてもよい。また、第１延設方向Ｄ１と貫通方向Ｄｐとが直交しなくてもよい。すなわち、貫通部６０が延びる方向は、貫通部６０が空間Ｓと蓄電セル１０の外部とに延びていれば、第１厚さ方向Ｄｔ１に交差する方向に延びていてもよい。
Although the resin frame 50 had two connecting parts 54, one of them may be omitted.
Although the penetrating portion 60 penetrates the first wall portion 51 in the first thickness direction Dt1, the present invention is not limited thereto. For example, the first thickness direction Dt1 and the penetration direction Dp of the penetration portion 60 may not match. Further, the first extending direction D1 and the penetration direction Dp do not need to be orthogonal to each other. That is, the direction in which the penetrating portion 60 extends may extend in a direction intersecting the first thickness direction Dt1, as long as the penetrating portion 60 extends into the space S and the outside of the power storage cell 10.
○ 本実施形態において、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。
○ 本実施形態において、バイポーラ電極１３を構成する上で、正極集電体２１の第２面２１ｂと負極集電体３１の第２面３１ｂとを重ね合わせていたが、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 the present embodiment, the energy storage device 1 may be configured to include the energy storage cell 10 described in the above modified example.
In the present embodiment, the bipolar electrode 13 is formed by overlapping the second surface 21b of the positive electrode collector 21 and the second surface 31b of the negative electrode collector 31. However, for example, the positive electrode collector 21 and the negative electrode collector 31 may be integrally formed.
○ 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。
○ 上記の実施形態は、本発明の一態様を説明したものである。したがって、本発明は、上記態様に限定されることなく、任意に変形され得る。
Although the positive electrode current collector 21 and the negative electrode current collector 31 are made of different materials in the above embodiment, 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.
The above embodiment describes one aspect of the present invention. Therefore, the present invention is not limited to the above aspect and may be modified in any manner.
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…樹脂枠、５１…第１壁部、５１ａ…第１面、５２…第２壁部、５２ａ…第１面、５３…第３壁部、５４…接続部、５５…傾斜面、５６…曲面、６０，６０ａ，６０ｂ…貫通部、７０…閉塞部、９０…フィルム、９１…封止樹脂、θ１，θ２…角度、Ｓ…空間、Ｔ１…第１壁部の厚さ、Ｔ２…第２壁部の厚さ、Ｔ３…第３壁部の厚さ、Ａ…積層方向、Ｂ…放射方向、Ｄ１…第１延設方向、Ｄ２…第２延設方向、Ｄ３…第３延設方向、Ｄｔ１…第１厚さ方向、Ｄｔ２…第２厚さ方向、Ｄｔ３…第３厚さ方向、Ｄｐ…貫通方向。 1...electricity storage device, 10...electricity storage cell, 20...positive electrode, 21...positive electrode collector, 21a...first surface, 21d...outer peripheral portion, 22...positive electrode active material layer, 30...negative electrode, 31...negative electrode collector, 31a...first surface, 31d...outer peripheral portion, 32...negative electrode active material layer, 40...separator, 41...non-facing portion, 50...resin frame, 51...first wall portion, 51a...first surface, 52...second wall portion, 52a...first surface, 53...third wall portion, 54...connection portion, 55...inclined surface, 56...curved surface, 60, 60a, 60b...penetration portion, 70...blocking portion, 90...film, 91...sealing resin, θ1, θ2...angle, S...space, T1...thickness of first wall portion, T2...thickness of second wall portion, T3...thickness of third wall portion, A...stacking direction, B...radiation direction, D1...first extension direction, D2...second extension direction, D3...third extension direction, Dt1...first thickness direction, Dt2...second thickness direction, Dt3...third thickness direction, Dp...penetration direction.
Claims (7)
前記一対の電極の間に介在し、前記活物質層を囲む矩形枠状をなし、且つ前記一対の電極とともに区画する空間を封止する樹脂枠と、を備える蓄電セルであって、
前記樹脂枠に設けられ、前記空間と前記蓄電セルの外部とに延びる貫通部と、
前記貫通部を閉塞する閉塞部とを備え、
前記樹脂枠は、
前記貫通部が設けられる第１壁部と、
前記第１壁部に直交する方向に延びる第２壁部と、
前記第１壁部と前記第２壁部とを接続する接続部と、を有し、
前記第１壁部は、前記空間に臨む第１端面を有し、
前記第２壁部は、前記空間に臨む第２端面を有し、
前記接続部は、前記空間に臨み、且つ前記第１端面と前記第２端面とを接続する変化面を有し、
前記変化面は、前記第１端面及び前記第２端面それぞれとなす角度が鈍角となるように前記第１端面及び前記第２端面の間に延びていることを特徴とする蓄電セル。 A pair of electrodes each having an active material layer facing each other and overlapping each other;
a resin frame interposed between the pair of electrodes, forming a rectangular frame shape surrounding the active material layer, and sealing a space partitioned together with the pair of electrodes,
a through-hole provided in the resin frame and extending between the space and an outside of the energy storage cell;
A blocking portion that blocks the through-hole,
The resin frame is
A first wall portion in which the through portion is provided;
a second wall portion extending in a direction perpendicular to the first wall portion;
a connection portion that connects the first wall portion and the second wall portion,
The first wall portion has a first end surface facing the space,
the second wall portion has a second end surface facing the space,
the connection portion has a transition surface that faces the space and connects the first end surface and the second end surface,
The energy storage cell, wherein the transition surface extends between the first end surface and the second end surface so as to form obtuse angles with the first end surface and the second end surface.
前記第１端面と、前記第１端部寄りに設けられる前記第２壁部の前記第２端面とは、前記変化面により接続され、
前記第１端面と、前記第２端部寄りに設けられる前記第２壁部の前記第２端面とは、前記変化面により接続されていることを特徴とする請求項１に記載の蓄電セル。 The second wall portion is located near the first end of the first wall portion in the first extending direction, which is the direction in which the first wall portion extends, and near the first end of the first wall portion in the first extending direction. Each is provided near the two ends,
The first end surface and the second end surface of the second wall provided near the first end are connected by the transition surface,
The electricity storage cell according to claim 1, wherein the first end surface and the second end surface of the second wall portion provided near the second end are connected by the transition surface.
前記第１延設方向及び前記積層方向に直交する第１厚さ方向における前記第１壁部の厚さは、前記第２壁部が延びる第２延設方向及び前記積層方向に直交する第２厚さ方向における前記第２壁部の厚さ及び前記第１厚さ方向における前記第３壁部の厚さ以上であることを特徴とする請求項１又は請求項２に記載の蓄電セル。 The resin frame is continuous with the second wall on the opposite side of the first wall, and the first wall extends in a plan view in a stacking direction, which is a direction in which the pair of electrodes overlap. It has a third wall portion extending in the extension direction,
The thickness of the first wall portion in the first thickness direction perpendicular to the first extending direction and the laminating direction is the same as the thickness of the first wall portion in the first thickness direction perpendicular to the first extending direction and the laminating direction. The electricity storage cell according to claim 1 or 2, characterized in that the thickness is greater than or equal to the thickness of the second wall portion in the thickness direction and the thickness of the third wall portion in the first thickness direction.
前記第１延設方向において、前記接続部と前記貫通部とは前記貫通部の前記第１延設方向における幅以上の間隔を隔てて配置されていることを特徴とする請求項１～請求項３のいずれか一項に記載の蓄電セル。 the first wall portion has a plate shape whose thickness does not change in a first thickness direction perpendicular to a first extension direction in which the first wall portion extends and a stacking direction in which the pair of electrodes overlap each other,
The storage cell according to any one of claims 1 to 3, characterized in that, in the first extension direction, the connection portion and the through portion are arranged at a distance equal to or greater than the width of the through portion in the first extension direction.
前記複数の蓄電セルは、請求項１～請求項６のいずれか一項に記載の蓄電セルを少なくとも含むことを特徴とする蓄電装置。 Equipped with multiple energy storage cells,
A power storage device, wherein the plurality of power storage cells include at least the power storage cell according to any one of claims 1 to 6.
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