JP2010211944A - Power storage device and power storage module - Google Patents
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- JP2010211944A JP2010211944A JP2009053778A JP2009053778A JP2010211944A JP 2010211944 A JP2010211944 A JP 2010211944A JP 2009053778 A JP2009053778 A JP 2009053778A JP 2009053778 A JP2009053778 A JP 2009053778A JP 2010211944 A JP2010211944 A JP 2010211944A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
Description
この発明は、蓄電デバイスおよび蓄電モジュールに関する。詳しくは、電荷を蓄える蓄電部を収容する蓄電ケースの改良に関する。 The present invention relates to a power storage device and a power storage module. Specifically, the present invention relates to an improvement of a power storage case that houses a power storage unit that stores electric charges.
リチウム電池や電気二重層キャパシタなど蓄電デバイスにおいては、樹脂の表層に金属の中間層を含む積層フィルム（ラミネートフィルム）を材料として構成される蓄電ケースがよく用いられる（特許文献１〜特許文献５）。 In power storage devices such as lithium batteries and electric double-layer capacitors, power storage cases composed of a laminated film (laminate film) including a metal intermediate layer on the resin surface layer are often used (Patent Documents 1 to 5). .
その一例を図１４，図１５に基づいて説明すると、蓄電デバイス１００は、電荷を蓄える蓄電部１０１と、蓄電部１０１を収容する蓄電室１０２を形成する蓄電ケース１０３と、を備える。 An example thereof will be described with reference to FIGS. 14 and 15. The power storage device 100 includes a power storage unit 101 that stores electric charges and a power storage case 103 that forms a power storage chamber 102 that houses the power storage unit 101.
蓄電部１０１は、正極体と負極体とこれらの間に介在するセパレータとから積層体に構成される。正極体および負極体は、電荷を蓄える蓄電要素と、電荷の出し入れを行う集電要素とからなり、集電要素の同極同士が結束され、各結束部に極性の対応する電極端子１０４が接続される。 The power storage unit 101 is configured in a stacked body from a positive electrode body, a negative electrode body, and a separator interposed therebetween. The positive electrode body and the negative electrode body are composed of a power storage element for storing electric charge and a current collecting element for taking in and out electric charge, and the same polarity of the current collecting elements are bound to each other, and electrode terminals 104 corresponding to polarities are connected to the respective binding portions. Is done.
蓄電ケース１０３は、ラミネートフィルム（樹脂の表層に金属の中間層を含む積層フィルム）から成形される１対のケース部材１０３ａ，１０３ｂからなり、これらを組み合わせると、互いに向き合う凹部により、積層体１０１を収容する蓄電室１０２が画成される。 The electricity storage case 103 is composed of a pair of case members 103a and 103b formed from a laminate film (a laminated film including a metal intermediate layer on the surface of the resin). When these are combined, the laminated body 101 is formed by recesses facing each other. A power storage chamber 102 to be accommodated is defined.
積層体１０１（蓄電部）は、一方のケース部材１０３ａの内側において、積層体１０１の積層方向の一方の端面が凹部の底面に接するように収められ、その上に他方のケース部材１０３ｂが積層体１０１の積層方向の他方の端面に凹部の底面が接するように被せられる。互いの凹部を囲む周縁部１０６ａ，１０６ｂ（合フランジ）から電極端子１０４の先端側が外部へ突き出され、互いの凹部を囲む四辺の合フランジ１０６ａ，１０６ｂ同士を熱溶着することにより、蓄電室１０２を封止するシール部１０７（熱溶着部）が形成される。 The laminated body 101 (power storage unit) is housed inside the one case member 103a so that one end surface in the lamination direction of the laminated body 101 is in contact with the bottom surface of the recess, and the other case member 103b is placed on the laminated body 101 101 is covered so that the bottom surface of the recess is in contact with the other end surface in the stacking direction. The tip end side of the electrode terminal 104 protrudes from the peripheral edge portions 106a and 106b (joint flanges) surrounding the recesses to the outside, and the power storage chamber 102 is formed by thermally welding the four flanges 106a and 106b surrounding the recesses. A sealing portion 107 (thermal welding portion) to be sealed is formed.
蓄電デバイス１００は、充放電に伴う発熱により、蓄電室１０２の圧力が上昇することがあり、蓄電室１０２の圧力を所定値以下に抑えるため、ガス抜きバルブ１０５が設けられる。ガス抜きバルブ１０５は、一端が蓄電室１０２に開口すると共に他端が１対の電極端子１０４が突き出る一辺のシール部１０７（熱溶着部）を貫通して外部に開口するガス抜き通路と、このガス抜き通路を蓄電室１０２の圧力に応じて開閉する弁機構と、を備える。 In the power storage device 100, the pressure in the power storage chamber 102 may increase due to heat generated by charging / discharging, and a gas vent valve 105 is provided to keep the pressure in the power storage chamber 102 below a predetermined value. The degassing valve 105 has a degassing passage that opens to the outside through one side of the seal portion 107 (thermal welding portion) from which one end opens into the power storage chamber 102 and the other end protrudes from the pair of electrode terminals 104. A valve mechanism that opens and closes the gas vent passage according to the pressure in the storage chamber 102.
蓄電デバイス１００は、１個あたりの定格電圧が低いため、多くの場合、複数の蓄電デバイス１００を直列に接続することにより定格電圧を高めて使用される。そのため、図１６においては、蓄電デバイス１００を単位セルとして複数の単位セルから蓄電モジュール１２０が構成される。蓄電モジュールは、複数の単位セルが互いに厚み方向（積層体の積層方向）へ重なり合う集合体に整列され、隣り合う蓄電デバイス１００間が電極端子１０４を介して直列に接続される。 Since the power storage device 100 has a low rated voltage per unit, the power storage device 100 is often used by increasing the rated voltage by connecting a plurality of power storage devices 100 in series. Therefore, in FIG. 16, the power storage module 120 is configured from a plurality of unit cells using the power storage device 100 as a unit cell. In the power storage module, a plurality of unit cells are aligned in an assembly in which the unit cells overlap each other in the thickness direction (stacking direction of the stacked body), and adjacent power storage devices 100 are connected in series via electrode terminals 104.
このような蓄電デバイス１００の蓄電ケース１０３においては、蓄電室１０２とこれを封止するシール部１０７（熱溶着部）との間に段差が生じるため、とくに図１６のような蓄電モジュールを構成すると、デッドボリュームが大きくなってしまう。 In the power storage case 103 of the power storage device 100, a step is generated between the power storage chamber 102 and the seal portion 107 (thermal welding portion) that seals the power storage chamber 102. Therefore, when a power storage module as shown in FIG. , The dead volume will increase.
このデッドボリュームを小さくするため、蓄電室１０２を封止するシール部１０７の幅（シール幅）を小さくすると、シール性や耐久性に支障を来しかねない。また、特許文献５にあるようにシール部１０７を折り曲げると、折り目に生じる応力に起因する亀裂の発生を防止する手段の追加が必要となってしまう。 In order to reduce this dead volume, if the width (seal width) of the seal portion 107 that seals the power storage chamber 102 is reduced, the sealing performance and durability may be hindered. Further, when the seal portion 107 is bent as in Patent Document 5, it is necessary to add means for preventing the occurrence of cracks due to the stress generated in the fold.
この発明は、このような課題に着目してなされたものであり、蓄電ケースのシール部がデッドボリュームとならない、蓄電デバイスおよび蓄電モジュールの提供を目的とする。 This invention is made paying attention to such a subject, and it aims at provision of the electrical storage device and electrical storage module in which the seal part of an electrical storage case does not become a dead volume.
第１の発明は、電荷を蓄える蓄電部として正極体と負極体とこれらの間に介在するセパレータとから構成される積層体と、この積層体を収容する蓄電室を形成する蓄電ケースと、を備える蓄電デバイスにおいて、前記蓄電ケースは、積層体をその積層方向の前後からケース部材で被覆すると共にこれら周縁部を積層体の積層面に対して垂直または略垂直な接合面をもって互いに重ね合わせて接合することにより前記蓄電室を画成して封止するシール部を形成してなることを特徴とする。 According to a first aspect of the present invention, there is provided a stacked body including a positive electrode body, a negative electrode body, and a separator interposed therebetween as a power storage unit for storing electric charge, and a power storage case that forms a power storage chamber that houses the stacked body. In the electricity storage device provided, the electricity storage case is formed by covering the laminated body with a case member from the front and rear in the laminating direction and superimposing these peripheral portions on each other with a joining surface perpendicular or substantially perpendicular to the laminated surface of the laminated body. Thus, a sealing portion for defining and sealing the power storage chamber is formed.
第２の発明は、電荷を蓄える蓄電部として正極体と負極体とこれらの間に介在するセパレータとから構成される積層体と、この積層体を収容する蓄電室を形成する蓄電ケースと、を備える蓄電デバイスにおいて、前記蓄電ケースは、中央の底部と周囲の側部とから断面コ字形に成形される１対のケース部材からなり、これらケース部材の断面コ字形の開口側を前記積層体の積層方向から嵌め合わせることにより、互いに積層体の積層面に対して垂直または略垂直な接合面をもって重なり合う側部と互いに対向する底部とから前記蓄電室を画成し、互いに重なり合う側部を接合することによって前記蓄電室を封止するシール部を形成してなることを特徴とする。 According to a second aspect of the present invention, there is provided a stacked body including a positive electrode body, a negative electrode body, and a separator interposed therebetween as a power storage unit that stores electric charges, and a power storage case that forms a power storage chamber that houses the stacked body. In the electric storage device provided, the electric storage case is composed of a pair of case members formed in a U-shaped cross section from a central bottom portion and a peripheral side portion, and the opening side of the U-shaped cross section of the case member is formed on the laminated body. By fitting together from the stacking direction, the power storage chamber is defined from side portions that overlap with each other with a joint surface perpendicular or substantially perpendicular to the stack surface of the stack, and a bottom portion that faces each other, and the side portions that overlap each other are joined. Thus, a seal portion for sealing the electricity storage chamber is formed.
第３の発明は、第１の発明または第２の発明において、前記積層体の周囲に積層体の積層方向から嵌合して前記蓄電室の互いに接合する側部と前記積層体との間に介装される内側枠体を備え、この枠体の枠外側面は、前記シール部の互いに重なり合う側部を接合するシール面と平行に設定されることを特徴とする。 According to a third invention, in the first invention or the second invention, between the side of the power storage chamber and the side of the power storage chamber that is fitted from the stacking direction of the stack around the stack. An inner frame is provided, and an outer surface of the frame is set in parallel with a seal surface that joins the overlapping side portions of the seal portion.
第４の発明は、第１の発明〜第３の発明の何れか１つにおいて、前記シール部の周囲に積層体の積層方向から嵌合して前記シール部の外面を被覆する外側枠体を備え、この枠体の枠内側面は、前記シール部の互いに重なり合う側部を接合するシール面と平行に設定されることを特徴とする。 According to a fourth invention, in any one of the first to third inventions, an outer frame body that fits from the stacking direction of the laminate around the seal portion and covers the outer surface of the seal portion. The frame inner surface of the frame body is set parallel to a seal surface that joins the overlapping side portions of the seal portion.
第５の発明は、第１の発明〜第４の発明の何れか１つにおいて、前記蓄電ケースを構成する１対のケース部材は、樹脂の表層に金属の中間層を含む積層フィルムから成形されることを特徴とする。 According to a fifth invention, in any one of the first to fourth inventions, the pair of case members constituting the power storage case is formed from a laminated film including a metal intermediate layer on a resin surface layer. It is characterized by that.
第６の発明は、複数の単位セルから構成される蓄電モジュールにおいて、第１の発明〜第５の発明の何れか１つに係る蓄電デバイスを単位セルとして構成されることを特徴とする。 According to a sixth aspect of the present invention, in the power storage module including a plurality of unit cells, the power storage device according to any one of the first to fifth aspects is configured as a unit cell.
第１の発明〜第５の発明においては、蓄電室のシール部は、積層体の積層面に対して垂直または略垂直な方向がシール幅となり、蓄電室の周囲から積層体の積層面と平行な方向へ突き出ないので、従来のようにデッドボリュームを生じることがなく、蓄電デバイスの外形が小さくなり、単位体積あたりの蓄電容量が向上する、という効果が得られる。 In the first to fifth aspects of the invention, the seal portion of the electricity storage chamber has a seal width in a direction perpendicular or substantially perpendicular to the laminate surface of the laminate, and is parallel to the laminate surface of the laminate from the periphery of the electricity storage chamber. Therefore, there is no dead volume as in the conventional case, the outer shape of the electricity storage device is reduced, and the electricity storage capacity per unit volume is improved.
蓄電室の圧力は、シール部において、ケース部材の周縁部が互いに重なり合う方向（接合面と垂直な方向）へ作用する。つまり、シール部（熱溶着部）の接合面は、せん断方向の力を受けるのみで、接合面を引き剥がす方向の力を受けないので、シール部の剥離を効果的に防止することができる。 The pressure in the power storage chamber acts in the seal portion in the direction in which the peripheral portions of the case members overlap each other (the direction perpendicular to the bonding surface). That is, the joint surface of the seal portion (thermal weld portion) only receives a force in the shearing direction, and does not receive a force in a direction to peel off the joint surface, so that peeling of the seal portion can be effectively prevented.
第６の発明においては、複数の蓄電デバイスから構成される蓄電モジュールの体積効率を大幅に高めることができる。 In the sixth invention, the volume efficiency of the power storage module composed of a plurality of power storage devices can be significantly increased.
図に基づいて、この発明に係る蓄電デバイスの実施形態を説明する。図１〜図５は、第１実施形態を表すものであり、図６は第２実施形態を表すものであり、図７〜図９は、第３実施形態を表すものであり、図１０〜図１２は、第４実施形態を表すものであり、図１３は、第５実施形態を表すものである。 An embodiment of an electricity storage device according to the present invention will be described based on the drawings. 1 to 5 show the first embodiment, FIG. 6 shows the second embodiment, and FIGS. 7 to 9 show the third embodiment. FIG. 12 shows the fourth embodiment, and FIG. 13 shows the fifth embodiment.
図１〜図５の第１実施形態を説明する。図１〜図５において、蓄電デバイス１０は、電荷を蓄える蓄電部１１と、蓄電部１１を収容する蓄電室１２を形成する蓄電ケース１３と、を備える。 A first embodiment of FIGS. 1 to 5 will be described. 1 to 5, the power storage device 10 includes a power storage unit 11 that stores electric charges and a power storage case 13 that forms a power storage chamber 12 that houses the power storage unit 11.
蓄電部１１は、正極体および負極体をこれらの間にセパレータを介装しつつ交互に積層して構成される。正極体および負極体は、電荷を蓄える蓄電要素と、電荷の出し入れを行う集電要素とからなり、集電要素の同極同士が結束され、各結束部に極性の対応する電極端子１４が接続される。 The power storage unit 11 is configured by alternately stacking positive electrode bodies and negative electrode bodies with a separator interposed therebetween. The positive electrode body and the negative electrode body are composed of a power storage element for storing electric charge and a current collecting element for taking in and out electric charge, and the same polarity of the current collecting elements are bound to each other, and electrode terminals 14 corresponding to polarities are connected to the respective binding portions. Is done.
蓄電ケース１３は、積層体１１をその積層方向の前後からケース部材１３ａ，１３ｂで被覆すると共にこれら周縁部１６ａ，１６ｂを積層体１１の積層面と垂直な接合面をもって互いに重ね合わせて接合することにより形成される。ケース部材１３ａ，１３ｂの周縁部１６ａ，１６ｂを接合することにより、蓄電室１２が画成され、かつ蓄電室１２を封止するシール部１７が形成される。 In the electricity storage case 13, the laminated body 11 is covered with case members 13a and 13b from the front and rear in the laminating direction, and the peripheral portions 16a and 16b are overlapped and joined to each other with a joining surface perpendicular to the laminated surface of the laminated body 11. It is formed by. By joining the peripheral portions 16a and 16b of the case members 13a and 13b, the power storage chamber 12 is defined, and the seal portion 17 that seals the power storage chamber 12 is formed.
具体的に説明すると、蓄電ケース１３は、複数の樹脂層に金属の中間層を含む積層フィルム（ラミネートフィルム）からプレス加工によって成形される１対のケース部材１３ａ，１３ｂから構成される。各ケース部材１３ａ，１３ｂは、中央の底部１８ａ，１８ｂと周囲の側部１６ａ，１６ｂとから断面コ字形に成形され、互いの断面コ字形の開口側を積層体１１の積層方向の前後から嵌め合わせると、前後の底部１８ａ，１８ｂと互いに重なり合う側部１６ａ，１６ｂとからこれらの内側に積層体１１を収容する蓄電室１２が画成される。 Specifically, the electricity storage case 13 is composed of a pair of case members 13a and 13b formed by press working from a laminated film (laminate film) including a metal intermediate layer in a plurality of resin layers. Each case member 13a, 13b is formed into a U-shaped cross section from the center bottom portions 18a, 18b and the surrounding side portions 16a, 16b, and the opening side of each cross-sectional U shape is fitted from the front and rear in the stacking direction of the laminate 11. When combined, the power storage chamber 12 for accommodating the stacked body 11 is defined inside the front and rear bottom portions 18a and 18b and the side portions 16a and 16b overlapping each other.
電極端子１４は、積層体１１の積層面と平行な方向へ延びる状態から積層体１１の積層面と垂直な方向へ延びる状態に折り曲げられ、蓄電室１２の互いに重なり合う側部１６ａ，１６ｂの接合面に沿って外部へ突出される。また、蓄電室１２の圧力を所定値以下に抑えるガス抜きバルブ１５が蓄電室１２の互いに重なり合う側部１６ａ，１６ｂをこれと垂直方向へ貫通して組み付けられる。 The electrode terminal 14 is bent from a state extending in a direction parallel to the stacking surface of the stacked body 11 to a state extending in a direction perpendicular to the stacking surface of the stacked body 11, and the joining surfaces of the overlapping side portions 16 a and 16 b of the power storage chamber 12. It protrudes to the outside along. Further, a gas vent valve 15 that suppresses the pressure in the power storage chamber 12 to a predetermined value or less is assembled through the side portions 16a and 16b of the power storage chamber 12 that overlap each other in a direction perpendicular thereto.
ケース部材１３ａ，１３ｂの互いに重なり合う側部１６ａ，１６ｂ同士は、積層体１１の積層面と垂直な接合面をもって熱溶着により接合される。この熱溶着部１７（シール部）により、蓄電室１２は、積層体１１の収容状態に封止される。また、シール部１７は、蓄電室１２から外部へ突出する電極端子１４およびガス抜きバルブ１５の周囲を隙間なく包み込むように封止する。電極端子１４の外部に突き出る部分は、シール部１７の接合面に沿って延びる状態から積層体１１の積層面と平行な方向へ延びる状態に折り曲げられる。 The side portions 16a and 16b of the case members 13a and 13b that are overlapped with each other are bonded by thermal welding with a bonding surface perpendicular to the stacked surface of the stacked body 11. The power storage chamber 12 is sealed in the accommodated state of the stacked body 11 by the heat welding portion 17 (seal portion). Further, the seal portion 17 seals the electrode terminal 14 and the gas vent valve 15 projecting outside from the power storage chamber 12 so as to wrap around the gap without any gap. The portion protruding to the outside of the electrode terminal 14 is bent from a state extending along the joint surface of the seal portion 17 to a state extending in a direction parallel to the stacked surface of the stacked body 11.
ガス抜きバルブ１５は、一端が蓄電室１２に開口すると共に他端がシール部１７を貫通して外部に開口するガス抜き通路と、蓄電室１２の圧力に応じてガス抜き通路を開閉する弁機構と、を備える。２０はガス抜き通路を形成する管体であり、電気絶縁性や熱溶着性を持つ樹脂から一体成形される。 The degassing valve 15 includes a degassing passage whose one end opens into the power storage chamber 12 and the other end passes through the seal portion 17 and opens to the outside, and a valve mechanism that opens and closes the degassing passage according to the pressure of the power storage chamber 12. And comprising. Reference numeral 20 denotes a tube body that forms a gas vent passage, and is integrally formed from a resin having electrical insulation properties and heat welding properties.
このように構成すると、蓄電室１２のシール部１７は、積層体１１の積層面に対して垂直な方向がシール幅となり、蓄電室１２の周囲から積層体１１の積層面と平行な方向へ突き出ないので、従来（例えば、図１４〜図１６の蓄電デバイス１００）のようにデッドボリュームを生じることがなく、蓄電デバイス１０の外形が小さくなり、単位体積あたりの蓄電容量が向上する、という効果が得られる。 With this configuration, the seal portion 17 of the power storage chamber 12 has a seal width in a direction perpendicular to the stacking surface of the stacked body 11 and protrudes from the periphery of the power storage chamber 12 in a direction parallel to the stacking surface of the stacked body 11. Therefore, the dead volume is not generated as in the conventional case (for example, the power storage device 100 in FIGS. 14 to 16), the outer shape of the power storage device 10 is reduced, and the power storage capacity per unit volume is improved. can get.
図１の蓄電デバイス１０と、図１５の蓄電デバイス１００と、を比較すると、図１５の縦幅寸法Ｄが図１のＤ’に縮小する。また、図１５の横幅寸法Ｅが図１のＥ’に縮小する。奥行（厚み幅）寸法Ｆ（図示せず）が同一の場合、図１５の占有する体積は、Ｄ×Ｅ×Ｆであるのに対し、図１の占有する体積は、Ｄ’×Ｅ’×Ｆに縮小する。両者の積層体１０１，１１が同一の場合、積層体１０１，１１の蓄電容量Ｑ（電気二重層キャパシタの静電容量）は、変わらないが、単位体積あたりの蓄電容量は、図１５の方がＱ／（Ｄ×Ｅ×Ｆ）であるのに対し、図１の方はＱ／（Ｄ’×Ｅ’×Ｆ）となり、図１の方が（Ｄ×Ｅ×Ｆ）／（Ｄ’×Ｅ’×Ｆ）倍、高くなる。 When the power storage device 10 of FIG. 1 is compared with the power storage device 100 of FIG. 15, the vertical width dimension D of FIG. 15 is reduced to D ′ of FIG. Further, the width E of FIG. 15 is reduced to E ′ of FIG. When the depth (thickness width) dimension F (not shown) is the same, the occupied volume in FIG. 15 is D × E × F, whereas the occupied volume in FIG. 1 is D ′ × E ′ ×. Reduce to F. When both the stacked bodies 101 and 11 are the same, the storage capacity Q (electrostatic capacity of the electric double layer capacitor) of the stacked bodies 101 and 11 does not change, but the storage capacity per unit volume is more in FIG. Q / (D × E × F), whereas FIG. 1 is Q / (D ′ × E ′ × F), and FIG. 1 is (D × E × F) / (D ′ ×). E ′ × F) times higher.
この発明に係る蓄電デバイス１０においては、シール部１７の接合面の幅（シール幅）が積層体１１の積層面と垂直な方向に設定されるので、図１５の縦幅寸法Ｄが図１のＤ’、図１５の横幅寸法Ｅが図１のＥ’、に縮小するため、単位体積あたりの蓄電容量が向上する。なお、図１および図１５において、Ａは積層体１１，１０１の積層面の縦幅寸法であり、Ｂは積層体１１、１０１の積層面の横幅寸法である。 In the electricity storage device 10 according to the present invention, the width (seal width) of the joint surface of the seal portion 17 is set in a direction perpendicular to the laminate surface of the laminate 11, so that the vertical width dimension D in FIG. Since the width dimension E of FIG. 15 is reduced to D ′ and E ′ of FIG. 1, the storage capacity per unit volume is improved. In FIGS. 1 and 15, A is the vertical width dimension of the stacked surfaces of the stacked bodies 11 and 101, and B is the horizontal width dimension of the stacked surfaces of the stacked bodies 11 and 101.
シール部１７については、図１のシール幅を図１５のシール幅と同等に確保することにより、従来例と同程度のシール性（気密性）および耐久性が得られるものとなる。図１５の蓄電デバイス１００において、シール部１０７は、他の三辺のシール部１０７に較べると、端子１０４回りおよびバルブ１０５（管体）回りのシール性および耐久性を確保するため、シール幅が大きく設定される。図１の蓄電デバイス１０においても、シール幅は、図１５における電極端子１０４およびガス抜きバルブ１０５が突出する一辺のシール幅と同等に設定される。 About the seal part 17, the sealing performance (airtightness) and durability comparable to a prior art example will be acquired by ensuring the sealing width of FIG. 1 equivalent to the sealing width of FIG. In the electricity storage device 100 of FIG. 15, the seal portion 107 has a seal width larger than that of the other three side seal portions 107 in order to secure the sealability and durability around the terminal 104 and the valve 105 (tube body). It is set large. Also in the electricity storage device 10 of FIG. 1, the seal width is set to be equal to the seal width of one side from which the electrode terminal 104 and the gas vent valve 105 in FIG. 15 protrude.
図１において、電極端子１４は、シール部１７をその接合面に沿って外部へ貫通するので、端子１４回りのシール性が良好に確保される。ガス抜きバルブ１５については、シール部１７の接合面をこれと垂直な方向へ貫通するので、バルブ１５回りのシール幅がシール部１７の厚み分となる。このため、管体２０（ガス抜き通路を形成する）の一端（蓄電室１２側の開口端部）に鍔部２０ａが一体成形され、同じく管体２０の所定部位に管体２０を軸方向へ圧縮すると潰れて鍔部２０ｂを形成する屈伸部が備えられる（図５、参照）。 In FIG. 1, since the electrode terminal 14 penetrates the seal part 17 to the outside along the joint surface, the sealing performance around the terminal 14 is ensured satisfactorily. The degassing valve 15 passes through the joint surface of the seal portion 17 in a direction perpendicular thereto, so that the seal width around the valve 15 is equal to the thickness of the seal portion 17. For this reason, the flange portion 20a is integrally formed at one end (opening end portion on the power storage chamber 12 side) of the tube body 20 (forming a gas vent passage), and the tube body 20 is also axially attached to a predetermined portion of the tube body 20. A bending / extending portion is formed which is crushed when compressed to form the flange 20b (see FIG. 5).
ガス抜きバルブ１５は、鍔部２０ａ，と屈伸部から形成される鍔部２０ｂとの間にケース部材１３ａの側部１６ａを挟む状態に組み付けられ、ケース部材１３ａ，１３ｂ同士の嵌め合わせにより、ケース部材１３ａ，１３ｂの互いに重なり合う側部１６ａ，１６ｂ間に鍔部２０ｂが挟ま込まれ、この状態で側部１６ａ，１６ｂを熱溶着することにより、これら側部１６ａ，１６ｂ間および鍔部２０ａ２０ｂを含むバルブ１５回りが封止される。 The gas vent valve 15 is assembled in a state in which the side portion 16a of the case member 13a is sandwiched between the flange portion 20a and the flange portion 20b formed from the bent and extended portion, and the case members 13a and 13b are fitted together to form a case. The flange portion 20b is sandwiched between the overlapping side portions 16a and 16b of the members 13a and 13b, and the side portions 16a and 16b are thermally welded in this state, thereby including the flange portions 20a and 20b between the side portions 16a and 16b. The area around the valve 15 is sealed.
これにより、ガス抜きバルブ１５は、シール部１７の接合面を垂直方向へ貫通するが、鍔部２０ａ，２０ｂによって熱溶着の接合面が増大する。つまり、鍔部２０ａ，２０ｂによって、バルブ１５回りの接合面にラビリンス構造が与えられるため、シール性および耐久性が良好に確保されるのである。 As a result, the gas vent valve 15 penetrates the joint surface of the seal portion 17 in the vertical direction, but the joint surface for heat welding is increased by the flange portions 20a and 20b. That is, since the labyrinth structure is given to the joint surface around the valve 15 by the flange portions 20a and 20b, the sealing performance and the durability are ensured satisfactorily.
無論、ガス抜きバルブ１５を、電極端子１４と同様に、シール部１７の接合面に沿って外部へ貫通させる構造としても良い。 Of course, the gas vent valve 15 may be configured to penetrate to the outside along the joint surface of the seal portion 17 similarly to the electrode terminal 14.
蓄電ケース１３は、ケース部材１３ａ，１３ｂの側部１６ａ，１６ｂ（周縁部）を積層体１１の積層面と垂直な接合面をもって互いに重ね合わせて接合するので、蓄電室の圧力は、シール部１７において、ケース部材１３ａ，１３ｂの側部１６ａ，１６ｂが互いに重なり合う方向（接合面と垂直な方向）へ作用する。つまり、シール部１７（熱溶着部）の接合面は、せん断方向の力を受けるのみで、熱溶着部の構造が耐えやすい方向であり、一方で従来の蓄電デバイス１００（図１４〜図１６、参照）のシール部１０７に働く、接合面を引き剥がす方向つまり剥離方向の力を受けないから、シール部１７の剥離を効果的に防止することができる。 The power storage case 13 is joined with the side portions 16a and 16b (peripheral portions) of the case members 13a and 13b being overlapped with each other with a joint surface perpendicular to the laminate surface of the stacked body 11, so , The side portions 16a and 16b of the case members 13a and 13b act in a direction in which they overlap each other (a direction perpendicular to the joint surface). That is, the joint surface of the seal portion 17 (thermal welding portion) is only in a direction in which the structure of the thermal welding portion is easily tolerated by receiving a force in the shear direction, while the conventional power storage device 100 (FIGS. 14 to 16, The seal portion 17 is effectively prevented from being peeled off because it is not subjected to the force in the peeling direction, that is, the peeling direction, acting on the seal portion 107 of the reference).
図６の第２実施形態を説明する。図６において、蓄電ケース１３を構成するケース部材１３ａ，１３ｂは、中央の底部１８ａ，１８ｂから周囲の側部１６ａ，１６ｂが積層体１１の積層面と略垂直（若干の傾斜角を持つ）な方向へ立ち上がるように形成される。ケース部材１３ａの側部１６ａは、積層体１１の積層面と垂直な方向に対し、断面コ字形の開口側が内方へ向く傾斜角が与えられ、ケース部材１３ｂの側部１６ｂは、積層体１１の積層面と垂直な方向に対し、断面コ字形の開口側が外方へ向く傾斜角が与えられる。また、互いの傾斜角は、積層体１１の積層面と垂直な方向に対し、傾斜の向きは相反するが、同一の角度に設定される。 A second embodiment of FIG. 6 will be described. In FIG. 6, the case members 13 a and 13 b constituting the electricity storage case 13 are such that the peripheral side portions 16 a and 16 b from the center bottom portions 18 a and 18 b are substantially perpendicular to the laminated surface of the laminated body 11 (having a slight inclination angle). It is formed to rise in the direction. The side portion 16a of the case member 13a is provided with an inclination angle in which the opening side having a U-shaped cross section faces inward with respect to the direction perpendicular to the lamination surface of the laminate 11, and the side portion 16b of the case member 13b is An inclination angle is given so that the opening side of the U-shaped cross section faces outward with respect to the direction perpendicular to the laminated surface. In addition, the inclination angle of each other is set to the same angle with respect to the direction perpendicular to the lamination surface of the laminate 11, although the inclination directions are opposite to each other.
１対のケース部材１３ａ，１３ｂは、互いの断面コ字形の開口側を積層体１１の積層方向の前後から嵌め合わせると、ケース部材１３ａの内方へ向く傾斜面（側部１６ａ）にケース部材１３ｂの外方へ向く傾斜面（側部１６ｂ）が重なり、これらの互いに重なり合う側部１６ａ，１６ｂを熱溶着することにより、シール部１７（積層体１１の積層面と略垂直な接合面を封止する）が形成されるのである。ガス抜きバルブは、図示しないが、第１実施形態と同一の構成のものが同様の要領をもって組み付けられる。 When a pair of case members 13a and 13b are fitted with the opening side having a U-shaped cross section from the front and rear in the stacking direction of the laminate 11, the case member is placed on the inclined surface (side portion 16a) facing inward of the case member 13a. An inclined surface (side portion 16b) facing outward of 13b is overlapped, and these overlapping side portions 16a and 16b are thermally welded to seal the sealing portion 17 (joint surface substantially perpendicular to the laminated surface of the laminate 11). Stop) is formed. Although the gas vent valve is not shown, the same configuration as that of the first embodiment is assembled in the same manner.
このような構成により、ケース部材１３ａ，１３ｂは、周囲の側部１６ａ，１６ｂが所定の傾斜角を持つので、嵌め合わせが容易となり、側部１６ａ，１６ｂ同士が重なり合う密着性も高められる。また、シール部１７の接合面が積層体１１の積層面と垂直な方向に対して傾斜する分、シール幅を稼ぐことができる。ケース部材の側部に与える傾斜角については、若干の傾斜角に限定されるものでなく、体積効率との関係から許容される範囲において、さらに大きな傾斜角を与えることも考えられる。 With such a configuration, the case members 13a and 13b have a predetermined inclination angle at the peripheral side portions 16a and 16b, so that the fitting is facilitated, and the adhesion between the side portions 16a and 16b is enhanced. Further, the seal width can be increased by the amount that the joint surface of the seal portion 17 is inclined with respect to the direction perpendicular to the laminate surface of the laminate 11. The inclination angle given to the side portion of the case member is not limited to a slight inclination angle, and it is conceivable to give a larger inclination angle within a range allowed in relation to volumetric efficiency.
図７〜図９の第３実施形態を説明する。図７〜図９において、蓄電デバイス１０は、積層体１１と、蓄電ケース１３を構成するケース部材１３ａ，１３ｂと、積層体１１と蓄電室を囲う側部１６ａ，１６ｂ（シール部１７）との間に介装される内側枠体３０と、を備える。 A third embodiment of FIGS. 7 to 9 will be described. 7 to 9, the power storage device 10 includes a stacked body 11, case members 13 a and 13 b constituting the power storage case 13, and side portions 16 a and 16 b (seal portions 17) surrounding the stacked body 11 and the power storage chamber. And an inner frame 30 interposed therebetween.
内側枠体３０は、枠の内側が積層体１１の周囲に積層体１１の積層方向から嵌合可能に形成される。枠の外側は、シール部１７の接合面と平行な面に形成され、ケース部材１３ａが断面コ字形の開口側から枠の外側面に嵌め付けられる。内側枠体３０は、ケース部材１３ａと共に積層体１１の周囲に積層方向から嵌め付けられ、内側枠体３０の外側で電極端子１４が積層体１１の積層面と垂直な方向へケース部材１３ａの側部１６ａに沿って延びるように折り曲げられる。そして、ケース部材１３ｂが断面コ字形の開口側からケース部材１３ａに嵌め合わされ、これらの互いに重なり合う側部１６ａ，１６ｂが熱溶着により接合される。 The inner frame 30 is formed so that the inner side of the frame can be fitted around the stacked body 11 from the stacking direction of the stacked body 11. The outer side of the frame is formed in a plane parallel to the joint surface of the seal portion 17, and the case member 13a is fitted to the outer side surface of the frame from the opening side having a U-shaped cross section. The inner frame body 30 is fitted together with the case member 13a around the multilayer body 11 from the stacking direction, and the electrode terminal 14 is positioned on the side of the case member 13a in the direction perpendicular to the stacking surface of the multilayer body 11 outside the inner frame body 30. It is bent so as to extend along the portion 16a. Then, the case member 13b is fitted into the case member 13a from the opening side having a U-shaped cross section, and the overlapping side portions 16a and 16b are joined by heat welding.
内側枠体３０は、硬質樹脂（電気絶縁性を持つ）または軽金属（電気絶縁処理を加える）から形成される。蓄電部（積層体）が電解液を含む場合（例えば、電気二重層キャパシタ）は、電解液に対する耐薬品性も望まれる。 The inner frame 30 is made of hard resin (having electrical insulation) or light metal (added with electrical insulation treatment). When the power storage unit (laminated body) includes an electrolytic solution (for example, an electric double layer capacitor), chemical resistance to the electrolytic solution is also desired.
このような内側枠体３０を設けることにより、電極端子１４を折り曲げる処理およびケース部材１３ａ，１３ｂの互いに嵌まり合う側部１６ａ，１６ｂを熱溶着する処理が、内側枠体３０の外側で行われるので、これらの処理から積層体１１を保護することができる。また、内側枠体３０は、積層体１１の周囲に嵌合するので、積層体１１の構成要素（正極体、負極体、セパレータ）のズレを抑えることができる。 By providing such an inner frame 30, the process of bending the electrode terminal 14 and the process of thermally welding the side parts 16 a and 16 b of the case members 13 a and 13 b that are fitted to each other are performed outside the inner frame 30. Therefore, the laminated body 11 can be protected from these processes. Moreover, since the inner side frame 30 fits around the laminated body 11, the shift | offset | difference of the component (a positive electrode body, a negative electrode body, a separator) of the laminated body 11 can be suppressed.
ケース部材１３ａ，１３ｂの側部１６ａ，１６ｂを熱溶着する処理においては、内側部材３０が互いに重なり合う側部１６ａ，１６ｂを積層体１１の積層面と垂直な接合面と平行に支持するので、これら側部１６ａ，１６ｂを十分に熱溶着することができる。つまり、シール部１７の接合強度を高められるのである。 In the process of heat-welding the side portions 16a and 16b of the case members 13a and 13b, the inner member 30 supports the side portions 16a and 16b that overlap each other in parallel with the joining surface perpendicular to the laminated surface of the laminated body 11. The side portions 16a and 16b can be sufficiently heat-welded. That is, the bonding strength of the seal portion 17 can be increased.
第３実施形態（図７〜図９の蓄電デバイス１０）は、第１実施形態（図１〜図４の蓄電デバイス１０）に内側部材３０を追加したものとなるが、内側部材３０については、第２実施形態（図６の蓄電デバイス１０）への適用も考えられる。第２実施形態においては、ケース部材１３ａ，１３ｂの互いに重なり合う側部１６ａ，１６ｂが積層体１１の積層面と略垂直な接合面をもって熱溶着されるので、内側枠体３０の外側面に接合面と平行な傾斜角が与えられることになる。 In the third embodiment (the electricity storage device 10 in FIGS. 7 to 9), the inner member 30 is added to the first embodiment (the electricity storage device 10 in FIGS. 1 to 4). Application to the second embodiment (power storage device 10 in FIG. 6) is also conceivable. In the second embodiment, the side portions 16a and 16b of the case members 13a and 13b that overlap each other are heat-welded with a joining surface that is substantially perpendicular to the lamination surface of the laminate 11, and therefore the joining surface is formed on the outer surface of the inner frame 30. An inclination angle parallel to is given.
図１０の第４実施形態を説明する。図１０において、蓄電デバイス１０は、積層体１１と、蓄電ケース１３を構成するケース部材１３ａ，１３ｂと、積層体１１と蓄電室１２を囲う側部１６ａ，１６ｂ（シール部１７）との間に介装される内側枠体３０と、蓄電室１２の周囲に嵌合する外側枠体４０と、を備える。シール部１７の接合面は、積層体１１の積層面と略垂直（積層体１１の積層方向に対して所定の傾斜角度を持つ）に設定される。 A fourth embodiment of FIG. 10 will be described. In FIG. 10, the electricity storage device 10 includes a laminate 11, case members 13 a and 13 b that constitute an electricity storage case 13, and side portions 16 a and 16 b (sealing portion 17) that surround the laminate 11 and the electricity storage chamber 12. The inner frame 30 is provided, and the outer frame 40 is fitted around the electricity storage chamber 12. The joint surface of the seal portion 17 is set to be substantially perpendicular to the laminate surface of the laminate 11 (having a predetermined inclination angle with respect to the laminate direction of the laminate 11).
内側枠体３０は、枠の内側が積層体の周囲に積層体の積層方向から嵌合可能に形成される。枠の外側は、シール部１７の接合面と平行な傾斜面に形成される。ケース部材１３ａが断面コ字形の開口側から枠の外側面に嵌め付けられ、側部１６ａを枠の外側面に沿わせることにより、所定の傾斜角が側部１６ａに与えられる。 The inner frame 30 is formed so that the inner side of the frame can be fitted around the stacked body from the stacking direction of the stacked body. The outside of the frame is formed on an inclined surface parallel to the joint surface of the seal portion 17. The case member 13a is fitted to the outer side surface of the frame from the opening side having a U-shaped cross section, and the side portion 16a is placed along the outer side surface of the frame, whereby a predetermined inclination angle is given to the side portion 16a.
外側枠体４０は、枠の内側がケース部材１３ｂの周囲（側部１６ｂの外面）に積層体１１の積層方向から嵌合可能に形成される。ケース部材１３ｂが断面コ字形の底部１８ｂ側から枠の内側面に嵌め付けられ、側部１６ｂを枠の内側面に沿わせることにより、所定の傾斜角が側部１６ｂに与えられる。 The outer frame body 40 is formed so that the inner side of the frame can be fitted around the case member 13b (the outer surface of the side portion 16b) from the stacking direction of the stacked body 11. The case member 13b is fitted to the inner side surface of the frame from the bottom 18b side having a U-shaped cross section, and the side portion 16b is placed along the inner side surface of the frame, whereby a predetermined inclination angle is given to the side portion 16b.
内側枠体３０は、ケース部材１３ａと共に積層体１１の周囲に積層方向から嵌め付けられ、内側枠体３０の外側で電極端子１４が積層体１１の積層面と垂直な方向へケース部材１３ａの側部１６ａに沿って延びるように折り曲げられる。そして、外側枠体４０と共にケース部材１３ｂが断面コ字形の開口側からケース部材１３ａの側部１６ａに嵌め合わされ、互いに重なり合う側部１６ａ，１６ｂが内側枠体３０と外側枠体４０との間に挟み込まれる。外側枠体４０を内側枠体３０に対し、積層体１１の積層方向（積層面と垂直な方向）へ締め付けると、所定の傾斜面に基づく楔作用により、外側枠体４０と内側部材３０との間で側部１６ａ，１６ｂ同士が積層体１１の積層面と略垂直な接合面をもって圧接され、この状態で熱溶着されるのである。 The inner frame body 30 is fitted together with the case member 13a around the multilayer body 11 from the stacking direction, and the electrode terminal 14 is positioned on the side of the case member 13a in the direction perpendicular to the stacking surface of the multilayer body 11 outside the inner frame body 30. It is bent so as to extend along the portion 16a. The case member 13b together with the outer frame body 40 is fitted to the side portion 16a of the case member 13a from the opening side having a U-shaped cross section, and the side portions 16a and 16b that overlap each other are interposed between the inner frame body 30 and the outer frame body 40. It is caught. When the outer frame 40 is tightened with respect to the inner frame 30 in the stacking direction of the stacked body 11 (direction perpendicular to the stacked surface), the outer frame 40 and the inner member 30 are separated by a wedge action based on a predetermined inclined surface. The side portions 16a and 16b are pressed against each other with a joining surface substantially perpendicular to the laminated surface of the laminated body 11, and are thermally welded in this state.
内側枠体３０および外側枠体４０は、硬質樹脂（電気絶縁性を持つ）または軽金属（電気絶縁処理を加える）から形成される。内側枠体３０の材質は、蓄電部１１（積層体）が電解液を含む場合（例えば、電気二重層キャパシタ）、電解液に対する耐薬品性も望まれる。 The inner frame body 30 and the outer frame body 40 are made of hard resin (having electric insulation) or light metal (added with electric insulation treatment). When the power storage unit 11 (laminated body) contains an electrolytic solution (for example, an electric double layer capacitor), the material of the inner frame 30 is also desired to have chemical resistance against the electrolytic solution.
このような構成により、ケース部材１３ａ，１３ｂは、周囲の側部１６ａ，１６ｂが所定の傾斜角を持つので、嵌め合わせが容易となり、側部１６ａ，１６ｂ同士が重なり合う密着性も高められる。また、互いに重なり合う側部１６ａ，１６ｂは、外側枠体４０と内側枠体３０との間に働く楔作用により、圧接状態に熱溶着されるため、蓄電室１２の周囲に均一かつ接合強度の高いシール部１７を形成することができる。 With such a configuration, the case members 13a and 13b have a predetermined inclination angle at the peripheral side portions 16a and 16b, so that the fitting is facilitated, and the adhesion between the side portions 16a and 16b is enhanced. Further, since the overlapping side portions 16a and 16b are thermally welded in a pressure contact state by a wedge action acting between the outer frame body 40 and the inner frame body 30, they are uniform around the power storage chamber 12 and have high bonding strength. The seal part 17 can be formed.
外側枠体４０により、外部からシール部１７を保護することができる。また、蓄電ケース１３の外形が一定に保持され、蓄電室１２の圧力に対しても、シール部１７の剥離を効果的に抑えられる。 The outer frame body 40 can protect the seal portion 17 from the outside. In addition, the outer shape of the electricity storage case 13 is kept constant, and the peeling of the seal portion 17 can be effectively suppressed against the pressure in the electricity storage chamber 12.
電極端子１４を折り曲げる処理およびケース部材の互いに重なり合う側部を熱溶着する処理は、内側枠体３０の外側で行われるので、これらの処理から積層体１１を保護することができる。内側枠体３０は、積層体１１の周囲に嵌合するので、積層体１１の構成要素（正極体、負極体、セパレータ）のズレを抑えることができる。 Since the process of bending the electrode terminal 14 and the process of thermally welding the overlapping side portions of the case member are performed outside the inner frame 30, the laminate 11 can be protected from these processes. Since the inner side frame 30 fits around the laminated body 11, the shift | offset | difference of the component (a positive electrode body, a negative electrode body, a separator) of the laminated body 11 can be suppressed.
図１１は、図１０の蓄電デバイス１０の組立工程を説明するものである。 FIG. 11 illustrates an assembly process of the electricity storage device 10 of FIG.
(a)においては、蓄電デバイス１０の構成要素（積層体１１，１対のケース部材１３ａ，１３ｂ，内側枠体３０，外側枠体４０）が揃えられる。各ケース部材１３ａ，１３ｂは、中央の底部１８ａ，１８ｂから周囲の側部１６ａ，１６ｂが積層体１１の積層面と垂直な方向へ立ち上がる断面コ字形に成形したものが用いられる。内側部材３０は、その外側面に所定の傾斜角を与えたもの、外側部材４０は、その内側面に所定の傾斜角を与えたもの、が用いられる。 In (a), the components (stacked body 11, a pair of case members 13a and 13b, the inner frame 30, and the outer frame 40) of the electricity storage device 10 are aligned. Each case member 13a, 13b is formed into a U-shaped cross section in which peripheral side portions 16a, 16b rise from a central bottom portion 18a, 18b in a direction perpendicular to the laminated surface of the laminated body 11. The inner member 30 is provided with a predetermined inclination angle on its outer surface, and the outer member 40 is provided with a predetermined inclination angle on its inner surface.
(b)においては、ケース部材１３ａが断面コ字形の開口側から内側枠体３０の外側面に嵌め付けられ、側部１６ａを内側枠体３０の外側面に沿わせることにより、所定の傾斜角が側部１６ａに与えられる一方、ケース部材１３ｂが断面コ字形の底部側から外側部材４０の内側面に嵌め付けられ、側部１６ｂを外側枠体４０の内側面に沿わせることにより、所定の傾斜角が側部１６ｂに与えられる。 In (b), the case member 13a is fitted to the outer surface of the inner frame body 30 from the opening side having a U-shaped cross section, and the side portion 16a is aligned with the outer surface of the inner frame body 30, whereby a predetermined inclination angle is obtained. Is provided to the side portion 16a, while the case member 13b is fitted to the inner side surface of the outer member 40 from the bottom side of the U-shaped cross section, and the side portion 16b is placed along the inner side surface of the outer frame body 40, thereby providing a predetermined An inclination angle is given to the side portion 16b.
(c)においては、ケース部材１３ａと共に内側枠体３０が積層体１１の周囲に積層方向から嵌め付けられ、内側枠体３０の外側で電極端子１４が積層体１１の積層面と垂直な方向へケース部材１３ａの側部１６ａに沿って延びるように折り曲げられ、ついで外側枠体４０と共にケース部材１３ｂが断面コ字形の開口側からケース部材１３ａの側部１６ａに嵌め付けられる。これにより、ケース部材１３ａ，１３ｂの互いに重なり合う側部１６ａ，１６ｂが内側部材３０と外側部材４０との間に挟まれ、外側枠体４０を内側枠体３０に対し、積層体１１の積層方向（積層面と垂直な方向）へ締め付けると、所定の傾斜面に基づく楔作用により、内側枠体３０と外側枠体４０との間で互いに重なり合う側部１６ａ，１６ｂ同士が積層体１１の積層面と略垂直（所定の傾斜角を持つ）な接合面をもって圧接される。 In (c), the inner frame 30 is fitted together with the case member 13 a around the laminated body 11 from the lamination direction, and the electrode terminals 14 are arranged outside the inner frame 30 in a direction perpendicular to the lamination surface of the laminated body 11. The case member 13a is bent so as to extend along the side portion 16a of the case member 13a, and then the case member 13b together with the outer frame body 40 is fitted to the side portion 16a of the case member 13a from the opening side having a U-shaped cross section. As a result, the side portions 16a and 16b of the case members 13a and 13b that are overlapped with each other are sandwiched between the inner member 30 and the outer member 40, and the outer frame 40 is stacked with respect to the inner frame 30 in the stacking direction of the stacked body 11 ( When tightened in a direction perpendicular to the laminated surface), the side portions 16a and 16b that overlap each other between the inner frame body 30 and the outer frame body 40 are separated from the laminated surface of the laminated body 11 by a wedge action based on a predetermined inclined surface. The contact is made with a substantially vertical joint surface (having a predetermined inclination angle).
(d)においては、ヒートシーラ５０により、ケース部材１３ａ，１３ｂの互いに重なり合う側部１６ａ，１６ｂが熱溶着により接合される。ヒートシーラ５０は、外側枠体４０を囲む加熱面を枠の外側面に圧接させて加熱することにより、内側枠体３０と外側枠体４０との間に挟圧される側部１６ａ，１６ｂ同士を熱溶着させるようになっている。なお、ヒートシーラ５０の１つにガス抜きバルブ１５（図１２、参照）の突出部を受け入れる穴が設けられる。 In (d), the heat sealer 50 joins the side portions 16a and 16b of the case members 13a and 13b that overlap each other by thermal welding. The heat sealer 50 presses the heating surface surrounding the outer frame 40 against the outer surface of the frame and heats the side portions 16a and 16b sandwiched between the inner frame 30 and the outer frame 40. It is designed to be heat welded. One of the heat sealers 50 is provided with a hole for receiving the protrusion of the gas vent valve 15 (see FIG. 12).
(e)においては、熱溶着処理が終わると、ヒートシーラ５０は、初期位置へ退避する。その後、電極端子１４を積層体１１の積層面と平行な方向へ折り曲げることにより、蓄電デバイス１０の組立が完成する。 In (e), when the heat welding process is finished, the heat sealer 50 is retracted to the initial position. Thereafter, the electrode terminal 14 is bent in a direction parallel to the laminated surface of the laminated body 11 to complete the assembly of the electricity storage device 10.
(d)の熱溶着処理については、ヒートシーラ５０に代えて図１２のような高周波誘導加熱装置６０を用いることも考えられる。高周波誘導加熱装置６０は、加熱コイル部６１と高周波発信器６２を備えるものであり、高周波発信器６２から高周波電流が加熱コイル部６１に内蔵の高周波誘導コイルを流れると、加熱コイル部６１が囲む被加熱体（金属）に誘導加熱を発生させる。ケース部材１３ａ，１３ｂにおいては、積層フイルム（ラミネートフィルム）の中間層（金属層）が誘導加熱を発生するため、外側枠体４０と内側枠体３０との間に挟圧される側部１６ａ，１６ｂ同士が熱溶着されるのである。 For the thermal welding process (d), it may be considered to use a high-frequency induction heating device 60 as shown in FIG. 12 instead of the heat sealer 50. The high-frequency induction heating device 60 includes a heating coil unit 61 and a high-frequency transmitter 62. When a high-frequency current flows from the high-frequency transmitter 62 through the high-frequency induction coil built in the heating coil unit 61, the heating coil unit 61 surrounds. Induction heating is generated in the object to be heated (metal). In the case members 13a and 13b, since the intermediate layer (metal layer) of the laminated film (laminate film) generates induction heating, the side portions 16a and 16a sandwiched between the outer frame body 40 and the inner frame body 30 are provided. 16b is heat-welded.
高周波誘導加熱装置６０によると、非接触状態で熱溶着（接合）が行えるので、蓄電ケース１３を傷つけることなく、ガス抜きバルブ１５の突出部との干渉も問題なく避けられる。 According to the high frequency induction heating device 60, heat welding (bonding) can be performed in a non-contact state, so that the power storage case 13 is not damaged and interference with the protruding portion of the gas vent valve 15 can be avoided without any problem.
シール部１７は、積層体１１の積層面と垂直な接合面に設定することも考えられる。その場合、外側枠体４０の内側面および内側枠体３０の外側面は、積層体１１の積層面と垂直な接合面と平行に形成されることになる。 It is also conceivable that the seal portion 17 is set to a joint surface perpendicular to the laminate surface of the laminate 11. In that case, the inner side surface of the outer frame body 40 and the outer side surface of the inner frame body 30 are formed in parallel with the bonding surface perpendicular to the stacked surface of the stacked body 11.
外側枠体４０については、第１実施形態（図１〜図４の蓄電デバイス１０）または第２実施形態（図６の蓄電デバイス１０）へ単独に追加することも考えられる。その場合、外側枠体４０により、外部からシール部１７を保護することができる。また、蓄電ケース１３の外形が一定に保持され、蓄電室１２の圧力に対しても、シール部１７の剥離を効果的に抑えられるのである。 About the outer side frame 40, adding independently to 1st Embodiment (The electrical storage device 10 of FIGS. 1-4) or 2nd Embodiment (The electrical storage device 10 of FIG. 6) is also considered. In that case, the outer frame body 40 can protect the seal portion 17 from the outside. Further, the outer shape of the electricity storage case 13 is kept constant, and the peeling of the seal portion 17 can be effectively suppressed against the pressure in the electricity storage chamber 12.
図１３の第５実施形態を説明する。図１３において、蓄電デバイス１０は、積層体１１と、１対のケース部材１３ａ，１３ｂと、を備える。各ケース部材１３ａ，１３ｂは、中央の底部１８ａ，１８ｂと周囲の側部１６ａ，１６ｂから断面コ字形になるものであり、金属（軽金属）または樹脂（熱溶着性や電気絶縁性を持つ）から成形される。ケース部材１３ａの側部１６ａの外面およびケース部材１３ｂの側部１６ｂの内面に所定の傾斜角が与えられる。ケース部材１３ａ，１３ｂは、互いに断面コ字形の開口側を積層体１１の積層方向の前後から嵌め合わせると、側部１６ａの外面に側部１６ｂの内面が重なり、積層体１１の積層面と略垂直な接合面を形成する。そして、互いに積層体１１の積層面と略垂直な接合面をもって重なり合う側部１６ａ，１６ｂを接合することにより、蓄電室１２を封止するシール部１７が形成される。 A fifth embodiment of FIG. 13 will be described. In FIG. 13, the electricity storage device 10 includes a stacked body 11 and a pair of case members 13 a and 13 b. Each case member 13a, 13b has a U-shaped cross section from the center bottom 18a, 18b and the surrounding sides 16a, 16b, and is made of metal (light metal) or resin (having heat-weldability and electrical insulation). Molded. A predetermined inclination angle is given to the outer surface of the side portion 16a of the case member 13a and the inner surface of the side portion 16b of the case member 13b. When the case members 13a and 13b are fitted to each other from the front and rear in the stacking direction of the stacked body 11, the inner surfaces of the side portions 16b overlap with the stacked surface of the stacked body 11 when the opening sides of the U-shaped cross section are fitted together. A vertical joint surface is formed. And the seal | sticker part 17 which seals the electrical storage chamber 12 is formed by joining the side parts 16a and 16b which overlap with a laminated surface of the laminated body 11 with a substantially perpendicular joining surface.
ケース部材１３ａ，１３ｂの側部１６ａ，１６ｂ同士の接合については、ヒートシール（図１１、参照）による熱溶着または高周波誘導加熱装置（図１２、参照）による熱溶着が用いられる。 For joining the side portions 16a and 16b of the case members 13a and 13b, heat welding by heat sealing (see FIG. 11) or heat welding by a high-frequency induction heating device (see FIG. 12) is used.
ケース部材１３ａ，１３ｂが金属（軽金属）製の場合、側部１６ａの外面と側部１６ｂの内面との間は、熱溶着性の樹脂が介装され、熱溶着により樹脂を介して接合される。また、蓄電室１２の内面や電極端子１４の回りに電気絶縁性の樹脂層が形成される。 When the case members 13a and 13b are made of metal (light metal), a heat-welding resin is interposed between the outer surface of the side portion 16a and the inner surface of the side portion 16b, and is joined via the resin by heat welding. . In addition, an electrically insulating resin layer is formed around the inner surface of the electricity storage chamber 12 and the electrode terminals 14.
ケース部材１３ａ，１３ｂが樹脂製の場合、蓄電ケース１３の外面（ケース部材１３ａ，１３ｂの底部１８ａ，１８ｂおよび側部１６ａ，１６ｂの外面）に金属層を形成すると、蓄電室１２の封止性（蓄電室１２の外部に対する遮断性）を高めることができる。例えば、電気二重層キャパシタの電解液が樹脂を通して外部に滲み出るのを防止しえることになる。 When the case members 13a and 13b are made of resin, when a metal layer is formed on the outer surface of the electricity storage case 13 (the outer surfaces of the bottom portions 18a and 18b and the side portions 16a and 16b of the case members 13a and 13b), the sealing property of the electricity storage chamber 12 is achieved. It is possible to improve (interruption with respect to the outside of the electricity storage chamber 12). For example, the electrolytic solution of the electric double layer capacitor can be prevented from oozing out through the resin.
以上の各実施形態（第１実施形態〜第５実施形態）に係る蓄電デバイス１０によると、シール部１７は、積層体の積層面と垂直または略垂直な接合面（シール面）を備えるので、蓄電室１２の周囲から積層体１１の積層面と平行な方向へ突き出ないので、従来（図１４〜図１６、参照）のようにデッドボリュームを生じることがなく、蓄電デバイス１０の外形が小さくなり、体積効率を高められる。 According to the electricity storage device 10 according to each of the above embodiments (first embodiment to fifth embodiment), the seal portion 17 includes a bonding surface (seal surface) that is perpendicular or substantially perpendicular to the lamination surface of the laminate. Since it does not protrude from the periphery of the electricity storage chamber 12 in the direction parallel to the laminated surface of the laminated body 11, there is no dead volume as in the prior art (see FIGS. 14 to 16), and the external shape of the electricity storage device 10 is reduced. , Increase volumetric efficiency.
蓄電室１２の圧力は、シール部１７において、ケース部材１３ａ，１３ｂの側部１６ａ，１６ｂが互いに重なり合う方向（接合面と垂直な方向）へ作用する。つまり、シール部１７の接合面は、せん断方向の力を受けるのみで、熱溶着部の構造が耐えやすい方向であり、これを引き剥がす方向の力を受けないので、シール部１７の剥離を効果的に抑えられる、という効果も得られる。 The pressure in the electricity storage chamber 12 acts in the seal portion 17 in a direction in which the side portions 16a and 16b of the case members 13a and 13b overlap each other (a direction perpendicular to the bonding surface). That is, the joint surface of the seal portion 17 is only subjected to a shearing direction force, and the structure of the heat-welded portion is easy to withstand, and is not subjected to a force in the direction of peeling off, so that peeling of the seal portion 17 is effective. The effect that it can be suppressed is also obtained.
図示しないが、第１実施形態〜第５実施形態の何れか１つに係る蓄電デバイス１０を単位セルとして複数の単位セルから構成される蓄電モジュールについては、体積効率の飛躍的な向上が得られる。なお、蓄電モジュールは、複数の単位セルから所定の集合体に組成され、これら単位セルが直列または直並列に接続される。 Although not shown, a dramatic improvement in volumetric efficiency is obtained for a power storage module including a plurality of unit cells using the power storage device 10 according to any one of the first to fifth embodiments as a unit cell. . The power storage module is composed of a plurality of unit cells into a predetermined assembly, and these unit cells are connected in series or in series-parallel.
この発明に係る蓄電ケースについては、電気二重層キャパシタやリチウム電池に限らず、各種の充放電可能な蓄電デバイスに対し、広く適用することができる。 About the electrical storage case which concerns on this invention, it can apply not only to an electric double layer capacitor and a lithium battery but to various electrical storage devices which can be charged / discharged.
１０ 蓄電デバイス
１１ 積層体（蓄電部）
１２ 蓄電室
１３ 蓄電ケース
１３ａ，１３ｂ ケース部材
１４ 電極端子
１５ ガス抜きバルブ
１６ａ，１６ｂ ケース部材の側部
１８ａ，１８ｂ ケース部材の底部
10 Power Storage Device 11 Laminated Body (Power Storage Unit)
DESCRIPTION OF SYMBOLS 12 Electric storage chamber 13 Electric storage case 13a, 13b Case member 14 Electrode terminal 15 Degassing valve 16a, 16b Case member side part 18a, 18b Case member bottom part
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009053778A JP2010211944A (en) | 2009-03-06 | 2009-03-06 | Power storage device and power storage module |
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|---|---|---|---|
| JP2009053778A JP2010211944A (en) | 2009-03-06 | 2009-03-06 | Power storage device and power storage module |
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| Publication Number | Publication Date |
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| JP2010211944A true JP2010211944A (en) | 2010-09-24 |
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| JP (1) | JP2010211944A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015228319A (en) * | 2014-05-30 | 2015-12-17 | 藤森工業株式会社 | Battery container, film packaged battery, and manufacturing method thereof |
| JP2021026949A (en) * | 2019-08-07 | 2021-02-22 | 昭和電工パッケージング株式会社 | Exterior package for power storage device and manufacturing method thereof |
| JP2021521613A (en) * | 2018-07-06 | 2021-08-26 | エルジー・ケム・リミテッド | Secondary battery and its manufacturing method |
-
2009
- 2009-03-06 JP JP2009053778A patent/JP2010211944A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015228319A (en) * | 2014-05-30 | 2015-12-17 | 藤森工業株式会社 | Battery container, film packaged battery, and manufacturing method thereof |
| JP2021521613A (en) * | 2018-07-06 | 2021-08-26 | エルジー・ケム・リミテッド | Secondary battery and its manufacturing method |
| JP7024173B2 (en) | 2018-07-06 | 2022-02-24 | エルジー・ケム・リミテッド | Secondary battery and its manufacturing method |
| US11664556B2 (en) | 2018-07-06 | 2023-05-30 | Lg Energy Solution, Ltd. | Secondary battery comprising a deformed gasket and method for manufacturing the same |
| JP2021026949A (en) * | 2019-08-07 | 2021-02-22 | 昭和電工パッケージング株式会社 | Exterior package for power storage device and manufacturing method thereof |
| JP7369564B2 (en) | 2019-08-07 | 2023-10-26 | 株式会社レゾナック・パッケージング | Exterior body for power storage device and manufacturing method thereof |
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