JP6627399B2 - Power storage device - Google Patents

Power storage device Download PDF

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JP6627399B2
JP6627399B2 JP2015202129A JP2015202129A JP6627399B2 JP 6627399 B2 JP6627399 B2 JP 6627399B2 JP 2015202129 A JP2015202129 A JP 2015202129A JP 2015202129 A JP2015202129 A JP 2015202129A JP 6627399 B2 JP6627399 B2 JP 6627399B2
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hole
diameter portion
case
seal member
storage device
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JP2017076475A (en
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祐良 山口
祐良 山口
木下 恭一
恭一 木下
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Toyota Industries Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Electric Double-Layer Capacitors Or The Like (AREA)
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Description

本発明は、蓄電装置に係り、詳しくは電解液を注入可能な孔の封止構造に特徴を有する蓄電装置に関する。   The present invention relates to a power storage device, and more particularly to a power storage device characterized by a structure for sealing a hole into which an electrolyte can be injected.

EV(Electric Vehicle)やPHV(Plug in Hybrid Vehicle)などの車両には、原動機となる電動機への供給電力を蓄える蓄電装置としてリチウムイオン電池などの二次電池が搭載されている。この種の二次電池の製造時には、ケースに電極組立体などの電池要素を収容し、そのケースの開口部を蓋体で閉塞している。また、二次電池のケースには、閉塞後のケース内に電解液を注入するための注液孔(注液口)が設けられており、注液孔は電解液の注入後に封止栓などによって封止されている。   2. Description of the Related Art Vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) are equipped with a secondary battery such as a lithium ion battery as a power storage device for storing power supplied to a motor serving as a prime mover. When manufacturing this kind of secondary battery, a battery element such as an electrode assembly is housed in a case, and an opening of the case is closed with a lid. In addition, the case of the secondary battery is provided with an injection hole (injection hole) for injecting the electrolyte into the closed case, and the injection hole is sealed with a sealing plug after the injection of the electrolyte. Is sealed by.

例えば、リチウムイオン二次電池の場合、二次電池の組立後に、二次電池を充放電させて二次電池を活性化させるエージング処理を行う。この処理において二次電池内にはガスが発生する。このため、エージング処理時において当該処理で発生したガスをケース内から排出させた後、ケースを密閉する必要がある。そのため、エージング処理を行う際に、注液孔を仮封止し、エージング処理終了後に仮封止を解除してガスを排出し、その後に、注液孔を本封止する。   For example, in the case of a lithium ion secondary battery, an aging process for charging and discharging the secondary battery and activating the secondary battery is performed after assembling the secondary battery. In this process, gas is generated in the secondary battery. For this reason, at the time of the aging process, it is necessary to discharge the gas generated in the process from the inside of the case and then seal the case. Therefore, when performing the aging process, the injection hole is temporarily sealed, and after the aging process is completed, the temporary sealing is released and gas is discharged, and then the injection hole is completely sealed.

特許文献1の密閉型電池は、図6に示すように、外装ケースの蓋61に設けられたねじ孔62と、ねじ孔62に挿入されて締結されたねじ63とを備え、ねじ孔62の底面64には外装ケースの内部と連通する内側開口部であって開口径がねじ孔62のケース表面における孔径よりも小さい開口部(注液口)65が設けられている。ねじ孔62の底面64とねじ63の先端63aとの間には開口部65を覆う孔内部シール部材66が配置されている。孔内部シール部材66は、ねじ63の締付力によってねじ孔62の底面64に押し付けられて開口部65を封止している。さらに、ねじ63の頭63bと蓋61との間には孔外部シール部材67が介装されており、孔外部シール部材67は、ねじ63の頭63bと蓋61との隙間を封止している。孔外部シール部材67は、ねじ63の頭63bの下面に形成された環状の溝68に収容されている。   As shown in FIG. 6, the sealed battery of Patent Document 1 includes a screw hole 62 provided in a cover 61 of an outer case, and a screw 63 inserted into and fastened to the screw hole 62. The bottom surface 64 is provided with an opening (liquid inlet) 65 which is an inner opening communicating with the inside of the outer case and whose opening diameter is smaller than the diameter of the screw hole 62 on the case surface. Between the bottom surface 64 of the screw hole 62 and the tip 63a of the screw 63, a hole internal sealing member 66 that covers the opening 65 is arranged. The hole inner seal member 66 is pressed against the bottom surface 64 of the screw hole 62 by the tightening force of the screw 63 to seal the opening 65. Further, a hole outer seal member 67 is interposed between the head 63 b of the screw 63 and the lid 61, and the hole outer seal member 67 seals a gap between the head 63 b of the screw 63 and the lid 61. I have. The hole outer seal member 67 is housed in an annular groove 68 formed on the lower surface of the head 63 b of the screw 63.

また、一般にリチウムイオン二次電池では、ケースは、過充電等によりケース内の電極体(発電要素)の反応が過度に進行して、ケース内部にガスが発生、蓄積して内圧が異常に上昇するのを防止するため、内圧が設定された圧力以上になると内部ガスを抜気する安全弁を備えている。   In general, in a lithium ion secondary battery, the reaction of the electrode body (power generation element) in the case excessively proceeds due to overcharging or the like, and gas is generated and accumulated inside the case, and the internal pressure rises abnormally. In order to prevent this, a safety valve is provided that vents the internal gas when the internal pressure exceeds a set pressure.

特開2009−48968号公報JP 2009-48968 A

特許文献1では、注液孔に直接ねじを螺合することにより、ねじを締結する際に電池内部への異物の混入を防止し、かつ開口部のシール性を良好にすることを目的としている。そのため、注液孔を封止する構成が安全弁の役割を果たすことはない。   In Patent Literature 1, an object is to screw a screw directly into a liquid injection hole to prevent foreign matter from entering the inside of a battery when the screw is fastened, and to improve sealing properties of an opening. . Therefore, the configuration that seals the injection hole does not play the role of a safety valve.

本発明は、前記の問題に鑑みてなされたものであって、その目的は、注液孔を蓄電装置の再使用時に電解液補充孔として利用することができ、しかも、注液孔の封止構造が安全弁の役割を果たすことができる蓄電装置を提供することにある。   SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and an object of the present invention is to allow a liquid injection hole to be used as an electrolyte replenishing hole when reusing a power storage device, and furthermore, to seal the liquid injection hole. An object of the present invention is to provide a power storage device whose structure can function as a safety valve.

上記課題を解決する蓄電装置は、電極組立体が収容されたケースの上壁に電解液を注入可能な孔が形成された蓄電装置である。そして、前記孔は、雌ねじ部が形成された大径部と、その底部に形成された小径部とが連続する状態で形成され、前記底部には前記底部を覆いかつ前記小径部と重ならない位置に気体通過孔が形成された弾性体製のシール部材が配置され、前記大径部には前記雌ねじ部と螺合し、かつ貫通孔が軸方向に形成された締付け部材が、前記シール部材を前記底部に押圧する押圧力が調整可能に取り付けられている。ここで、「ケースの上壁」とは、蓄電装置が使用される状態において上側に配置される壁を意味し、一般にはケースの上側に形成された開口部を覆う蓋体が上壁となるが、ケースの側方に形成された開口部から電極組立体をケース内に収容した後、開口部を蓋体で封止する蓄電装置の場合は、蓋体ではなく電解液を注入する孔が形成された壁が上壁となる。また、「弾性体」とは、ゴムのように全体が均一な充実体として形成されている状態でも弾性を示す材料に限らず、発泡プラスチックのように多孔性の状態で弾性を示す材料も意味する。発泡プラスチックの場合、独立気泡型の発泡体が好ましい。   A power storage device that solves the above problem is a power storage device in which a hole through which an electrolyte can be injected is formed in an upper wall of a case in which an electrode assembly is housed. The hole is formed in a state where a large-diameter portion in which a female screw portion is formed and a small-diameter portion formed in a bottom portion thereof are continuous with each other, and the bottom portion covers the bottom portion and does not overlap with the small-diameter portion. A sealing member made of an elastic body having a gas passage hole formed therein is disposed, and the large diameter portion is screwed with the female screw portion, and a tightening member having a through hole formed in the axial direction is used as the sealing member. The pressing force for pressing the bottom is adjustable. Here, the “upper wall of the case” means a wall disposed on an upper side in a state where the power storage device is used, and a lid that covers an opening formed on an upper side of the case generally serves as an upper wall. However, in the case of a power storage device in which the electrode assembly is accommodated in the case through the opening formed on the side of the case and then the opening is sealed with the lid, a hole for injecting the electrolyte solution is provided instead of the lid. The formed wall becomes the upper wall. The term “elastic body” is not limited to a material that exhibits elasticity even when the entire body is formed as a uniform solid body, such as rubber, but also a material that exhibits elasticity in a porous state, such as foamed plastic. I do. In the case of a foamed plastic, a closed cell foam is preferred.

この構成によれば、電解液を注入可能な孔の小径部から電解液が注入された後、大径部の底部にシール部材が配置され、シール部材は大径部の雌ねじ部と螺合する状態で大径部に固定される締付け部材により、締付け部材による締付け力が調整された状態で固定される。シール部材は弾性体製のため、蓄電装置の使用状態において過充電などでケース内の圧力が予め設定された圧力以上になると、ケース内の気体が大径部の底部及びシール部材の当接部との間を通過する。そして、シール部材の気体通過孔を経た後、締付け部材の貫通孔を経て排出され、シール部材が安全弁の役割を果たす。また、シール部材が弾性体製のため、シール部材は、ケース内の圧力が予め設定された圧力未満の時は、良好なシール機能を果たす。さらに、締付け部材は、孔の大径部に螺合されているため、蓄電装置を再使用する場合に、締付け部材を取り外した状態でシール部材を取り外せば、孔の小径部を電解液補充孔として使用することができる。したがって、本発明は、注液孔を蓄電装置の再使用時に電解液補充孔として利用することができ、しかも、注液孔の封止構造が安全弁の役割を果たすことができる。   According to this configuration, after the electrolyte is injected from the small diameter portion of the hole into which the electrolyte can be injected, the seal member is disposed at the bottom of the large diameter portion, and the seal member is screwed with the female screw portion of the large diameter portion. By the fastening member fixed to the large diameter portion in the state, the fastening member is fixed in a state where the fastening force of the fastening member is adjusted. Since the seal member is made of an elastic body, when the pressure in the case becomes equal to or higher than a predetermined pressure due to overcharging or the like in the state of use of the power storage device, the gas in the case is filled with the bottom of the large diameter portion and the contact portion of the seal member. Pass between. Then, after passing through the gas passage hole of the seal member, it is discharged through the through hole of the fastening member, and the seal member plays a role of a safety valve. Further, since the seal member is made of an elastic material, the seal member performs a good sealing function when the pressure in the case is lower than a preset pressure. Furthermore, since the fastening member is screwed into the large-diameter portion of the hole, when the power storage device is reused, the small-diameter portion of the hole can be removed by removing the sealing member with the fastening member removed. Can be used as Therefore, according to the present invention, the liquid injection hole can be used as an electrolyte replenishing hole when the power storage device is reused, and the sealing structure of the liquid injection hole can serve as a safety valve.

前記締付け部材は、ばねを介して前記シール部材に押圧力を付与することが好ましい。締付け部材は、シール部材に接触した状態で雌ねじ部に対する螺合量を調整することでシール部材に対する押圧力を調整することも可能である。しかし、ばねを介してシール部材を押圧する方が、押圧力を目的の値に調整することが容易になる。   It is preferable that the tightening member applies a pressing force to the seal member via a spring. The tightening member can also adjust the pressing force on the seal member by adjusting the amount of screwing with the female screw portion in a state in contact with the seal member. However, pressing the seal member via a spring makes it easier to adjust the pressing force to a desired value.

前記シール部材の上には、前記シール部材と同じ位置に気体通過孔が形成された硬質の押さえ板が配置され、前記シール部材は前記押さえ板を介して、前記締付け部材から前記押圧力を受けることが好ましい。ここで、「硬質の押さえ板」とは、押さえ板が、一方の側に弾性体が配置された状態で他方の側から部分的に押圧力を受けた際に、押圧力を直接受けた部分以外の部分も、押圧力を直接受けた部分と共に移動して弾性体を押圧することが可能な押さえ板を意味する。この構成によれば、シール部材は、硬質の押さえ板を介して締付け部材により押圧力を受けるため、締付け部材による押圧力がシール部材を均一に押圧し、シール部材のシール機能が良好に作用する。   A hard pressing plate having a gas passage hole formed at the same position as the sealing member is disposed on the sealing member, and the sealing member receives the pressing force from the tightening member via the pressing plate. Is preferred. Here, the “hard pressing plate” is a portion where the pressing plate is directly subjected to the pressing force when partially receiving the pressing force from the other side in a state where the elastic body is arranged on one side. The other parts also mean a pressing plate that can move together with the part directly receiving the pressing force and press the elastic body. According to this configuration, since the sealing member receives the pressing force from the tightening member via the hard pressing plate, the pressing force from the tightening member uniformly presses the sealing member, and the sealing function of the sealing member works well. .

本発明によれば、注液孔を蓄電装置の再使用時に電解液補充孔として利用することができ、しかも、注液孔の封止構造が安全弁の役割を果たすことができる。   According to the present invention, the liquid injection hole can be used as an electrolyte replenishing hole when the power storage device is reused, and the sealing structure of the liquid injection hole can serve as a safety valve.

(a)は一実施形態の二次電池の模式断面図、(b)は封止構造の拡大断面図。(A) is a schematic sectional view of a secondary battery of one embodiment, and (b) is an enlarged sectional view of a sealing structure. 封止構造の分解斜視図。FIG. 3 is an exploded perspective view of a sealing structure. 作用を示す模式断面図。FIG. 4 is a schematic cross-sectional view showing an operation. 別の実施形態の部分拡大断面図。FIG. 7 is a partially enlarged cross-sectional view of another embodiment. 別の実施形態の二次電池の部分模式断面図。FIG. 6 is a partial schematic cross-sectional view of a secondary battery according to another embodiment. 従来技術の模式断面図。FIG.

以下、本発明をリチウムイオン二次電池に具体化した一実施形態を図1〜図3にしたがって説明する。
図1(a)に示すように、蓄電装置としての二次電池10は、ケース11に電極組立体12及び電解液13が収容されている。ケース11は、有底四角筒状のケース本体14と、電極組立体12を挿入するケース本体14の開口部を閉塞する蓋体15とからなる。ケース本体14と蓋体15とは溶接によって接合されている。ケース本体14及び蓋体15はアルミニウム系金属製である。
An embodiment in which the present invention is embodied in a lithium ion secondary battery will be described below with reference to FIGS.
As shown in FIG. 1A, a secondary battery 10 as a power storage device has a case 11 in which an electrode assembly 12 and an electrolyte 13 are accommodated. The case 11 includes a case main body 14 having a bottomed quadrangular cylindrical shape, and a lid 15 for closing an opening of the case main body 14 into which the electrode assembly 12 is inserted. The case body 14 and the lid 15 are joined by welding. The case body 14 and the lid 15 are made of an aluminum-based metal.

蓋体15には正極端子16及び負極端子17が固定されている。正極端子16及び負極端子17は、雄ねじ部16a,17a及び鍔部16b,17bを有し、蓋体15に形成された孔を、鍔部16b,17bがケース11の内側に位置する状態で貫通して蓋体15から突出する雄ねじ部16a,17aに螺合するナット18により、蓋体15に締め付け固定されている。正極端子16及び負極端子17は、複数の二次電池10を電気的に接続するバスバー19をボルト20により締め付け固定可能に構成されている。   A positive electrode terminal 16 and a negative electrode terminal 17 are fixed to the lid 15. The positive electrode terminal 16 and the negative electrode terminal 17 have external thread portions 16a, 17a and flange portions 16b, 17b, and penetrate through holes formed in the lid 15 with the flange portions 16b, 17b positioned inside the case 11. Then, it is fastened and fixed to the lid 15 by a nut 18 screwed into the male screw portions 16a, 17a protruding from the lid 15. The positive electrode terminal 16 and the negative electrode terminal 17 are configured so that a bus bar 19 that electrically connects the plurality of secondary batteries 10 can be fastened and fixed with bolts 20.

正極端子16は鍔部16bに接合された導電部材21を介して電極組立体12の正極タブ12pに電気的に接続されている。負極端子17は鍔部17bに接合された導電部材22を介して電極組立体12の負極タブ12nに電気的に接続されている。   The positive electrode terminal 16 is electrically connected to the positive electrode tab 12p of the electrode assembly 12 via a conductive member 21 joined to the flange 16b. The negative electrode terminal 17 is electrically connected to the negative electrode tab 12n of the electrode assembly 12 via the conductive member 22 joined to the flange 17b.

次に電解液13を注入する注液孔と、注液孔を封止し、かつ二次電池10の安全弁の役割を果たすことが可能な封止構造について詳述する。
図1(b)及び図2に示すように、ケース11の上壁としての蓋体15には、電解液13を注入可能な孔30が形成されている。孔30は、上側に雌ねじ部31aが形成された大径部31と、その底部31bに形成された小径部32とが連続する状態で形成されている。小径部32は注液孔として機能する。底部31bには底部31bを覆いかつ小径部32と重ならない位置に気体通過孔33aが形成された弾性体製のシール部材33が配置されている。シール部材33の上には、シール部材33と同じ位置に気体通過孔34aが形成された硬質の押さえ板34が配置されている。この実施形態では、気体通過孔33a及び気体通過孔34aは、それぞれ、複数個、例えば4個形成されている。大径部31は、雌ねじ部31aの径が、シール部材33及び押さえ板34が収容される部分の径より大きく形成されている。
Next, a liquid injection hole for injecting the electrolyte 13 and a sealing structure capable of sealing the liquid injection hole and serving as a safety valve of the secondary battery 10 will be described in detail.
As shown in FIGS. 1B and 2, a hole 30 through which the electrolyte 13 can be injected is formed in the lid 15 as an upper wall of the case 11. The hole 30 is formed such that a large-diameter portion 31 having a female screw portion 31a formed on the upper side and a small-diameter portion 32 formed on a bottom portion 31b thereof are continuous. The small diameter portion 32 functions as a liquid injection hole. A sealing member 33 made of an elastic material and having a gas passage hole 33a formed at a position that covers the bottom portion 31b and does not overlap the small diameter portion 32 is disposed on the bottom portion 31b. On the seal member 33, a hard pressing plate 34 having a gas passage hole 34a formed at the same position as the seal member 33 is disposed. In this embodiment, a plurality of, for example, four, gas passage holes 33a and gas passage holes 34a are formed. The large diameter portion 31 is formed such that the diameter of the female screw portion 31a is larger than the diameter of the portion where the seal member 33 and the pressing plate 34 are accommodated.

大径部31には雌ねじ部31aと螺合する雄ねじ部35aを有する締付け部材35が、シール部材33を底部31bに押圧する押圧力が調整可能に取り付けられている。締付け部材35には軸方向に延びる貫通孔35bが形成されている。締付け部材35の上面には、締付け部材35が大径部31の雌ねじ部31aと螺合する状態で回転させる工具(ドライバー)を係合するためのキー溝35cが形成されている。シール部材33は、押さえ板34を介して、締付け部材35から押圧力を受ける。この実施形態では、締付け部材35は、ばね36を介してシール部材33に押圧力を付与する。即ち、シール部材33、押さえ板34、締付け部材35及びばね36が注液孔(小径部32)の封止構造を構成する。なお、この実施形態では、ばね36として圧縮コイルばねが使用されている。   A tightening member 35 having a male screw portion 35a screwed with the female screw portion 31a is attached to the large diameter portion 31 such that the pressing force for pressing the seal member 33 against the bottom portion 31b is adjustable. The fastening member 35 has a through hole 35b extending in the axial direction. On the upper surface of the tightening member 35, a key groove 35c is formed for engaging a tool (driver) that rotates the tightening member 35 in a state of being screwed with the female screw portion 31a of the large diameter portion 31. The sealing member 33 receives a pressing force from the tightening member 35 via the pressing plate 34. In this embodiment, the tightening member 35 applies a pressing force to the seal member 33 via the spring 36. That is, the sealing member 33, the holding plate 34, the fastening member 35, and the spring 36 form a sealing structure for the liquid injection hole (small diameter portion 32). In this embodiment, a compression coil spring is used as the spring 36.

次に前記のように構成された小径部(注液孔)32と、小径部(注液孔)32を封止し、かつ二次電池10の安全弁の役割を果たすことが可能な封止構造の作用を説明する。
二次電池10の製造方法においては、電極組立体12をケース11に収容した後、小径部(注液孔)32から電解液13を注入する注液工程と、注液後に小径部(注液孔)32を仮封止した状態で、エージングを行うエージング工程とを備える。また、エージング後に仮封止を解除してエージング工程で発生したガスをケース11外へ放出させた後、小径部(注液孔)32を本封止する封止工程を備える。
Next, the small diameter portion (liquid injection hole) 32 configured as described above, and a sealing structure capable of sealing the small diameter portion (liquid injection hole) 32 and serving as a safety valve of the secondary battery 10. The operation of will be described.
In the method of manufacturing the secondary battery 10, after the electrode assembly 12 is accommodated in the case 11, a liquid injection step of injecting the electrolyte 13 from a small diameter portion (liquid injection hole) 32, and a small diameter portion (liquid injection) after the liquid injection is performed. An aging step of performing aging while the holes (holes) 32 are temporarily sealed. Further, after the aging, the temporary sealing is released, and after the gas generated in the aging step is released to the outside of the case 11, a sealing step of completely sealing the small diameter portion (liquid injection hole) 32 is provided.

注液工程では、大径部31の雌ねじ部31aに螺合した状態の締付け部材35を取り外した後、ばね36、押さえ板34及びシール部材33を大径部31から取り出して、小径部32が開放された状態にする。その状態で、図示しない電解液タンクをケース11の上方に配置して、電解液を小径部32からケース11内に注入する。   In the liquid injection step, after removing the fastening member 35 screwed to the female screw portion 31a of the large diameter portion 31, the spring 36, the holding plate 34, and the seal member 33 are taken out from the large diameter portion 31, and the small diameter portion 32 is removed. Leave open. In this state, an electrolyte tank (not shown) is disposed above the case 11, and the electrolyte is injected into the case 11 from the small diameter portion 32.

電解液の注入完了後、シール部材33及び押さえ板34を気体通過孔33a,34aが重なる状態に重ねて、シール部材33が底部31bに当接する状態で大径部31内に収容する。次にばね36を押さえ板34の上に載置し、その状態で締付け部材35を雌ねじ部31aに螺合させた状態で、螺入量が予め設定された値になるまで回動する。   After the injection of the electrolytic solution is completed, the seal member 33 and the holding plate 34 are placed in a state where the gas passage holes 33a and 34a overlap with each other, and are housed in the large diameter portion 31 in a state where the seal member 33 contacts the bottom portion 31b. Next, the spring 36 is placed on the holding plate 34, and in this state, the tightening member 35 is screwed into the female screw portion 31a, and is rotated until the screw-in amount reaches a preset value.

図3に示すように、締付け部材35が予め設定された螺入量となる位置に固定されると、シール部材33は、締付け部材35による締付け力が予め設定された値に調整された状態で固定される。調整された状態とは、二次電池10の使用状態において過充電などでケース11内の圧力が予め設定された圧力以上になると、ケース11内の気体がケース11外に排出される状態を意味する。詳述すると、ケース11内の圧力が予め設定された圧力以上になると、図3に矢印で示すように、ケース11内の気体が小径部32から大径部31の底部31b及びシール部材33の当接部との間を通過し、気体通過孔33a,34aを経た後、締付け部材35の貫通孔35bを経て排出される。そのため、シール部材33が安全弁の役割を果たす。   As shown in FIG. 3, when the tightening member 35 is fixed at a position where the screwing amount is set in advance, the seal member 33 is in a state where the tightening force of the tightening member 35 is adjusted to a predetermined value. Fixed. The adjusted state means a state in which the gas in the case 11 is discharged to the outside of the case 11 when the pressure in the case 11 becomes equal to or higher than a predetermined pressure due to overcharging or the like in the use state of the secondary battery 10. I do. More specifically, when the pressure in the case 11 becomes equal to or higher than a preset pressure, the gas in the case 11 is changed from the small diameter portion 32 to the bottom 31b of the large diameter portion 31 and the sealing member 33 as indicated by an arrow in FIG. After passing between the contact portions and passing through the gas passage holes 33a and 34a, the gas is discharged through the through hole 35b of the fastening member 35. Therefore, the seal member 33 plays a role of a safety valve.

また、封止栓が溶接により蓋体に固定された場合と異なり、二次電池10のリユース(再使用時)に、蓋体15を外すことなく、小径部32を電解液補充孔として利用することができる。   Further, unlike the case where the sealing plug is fixed to the lid by welding, the small diameter portion 32 is used as an electrolyte replenishing hole without removing the lid 15 when the secondary battery 10 is reused (when reused). be able to.

この実施形態によれば、以下に示す効果を得ることができる。
(1)二次電池10は、電極組立体12が収容されたケース11の蓋体(上壁)15に電解液13を注入可能な孔30が形成された蓄電装置である。そして、孔30は、雌ねじ部31aが形成された大径部31と、その底部31bに形成された小径部32とが連続する状態で形成され、底部31bには底部31bを覆いかつ小径部32と重ならない位置に気体通過孔33aが形成された弾性体製のシール部材33が配置されている。大径部31には雌ねじ部31aと螺合し、かつ貫通孔35bが軸方向に形成された締付け部材35が、シール部材33を底部31bに押圧する押圧力が調整可能に取り付けられている。
According to this embodiment, the following effects can be obtained.
(1) The secondary battery 10 is a power storage device in which a hole 30 through which the electrolyte 13 can be injected is formed in a lid (upper wall) 15 of a case 11 in which an electrode assembly 12 is accommodated. The hole 30 is formed in a state where the large diameter portion 31 in which the female screw portion 31a is formed and the small diameter portion 32 formed in the bottom portion 31b are continuous, and the bottom portion 31b covers the bottom portion 31b and has the small diameter portion 32. A seal member 33 made of an elastic body and having a gas passage hole 33a formed at a position not overlapping with the seal member 33 is disposed. A fastening member 35 screwed to the female screw portion 31a and having a through hole 35b formed in the axial direction is attached to the large diameter portion 31 so that the pressing force for pressing the seal member 33 against the bottom portion 31b is adjustable.

この構成によれば、電解液13を注入可能な孔30の小径部32から電解液13がケース11内に注入された後、大径部31の底部31bにシール部材33が配置される。シール部材33は大径部31の雌ねじ部31aと螺合する状態で大径部31に固定される締付け部材35により、締付け部材35による締付け力が調整された状態で固定される。シール部材33は弾性体製のため、二次電池10の使用状態において過充電などでケース11内の圧力が予め設定された圧力以上になると、ケース11内の気体が小径部32を経て、大径部31の底部31b及びシール部材33の当接部との間を通過する。そして、シール部材33の気体通過孔33a、押さえ板34の気体通過孔34aを経た後、締付け部材35の貫通孔35bを経て排出されるため、シール部材33が安全弁の役割を果たす。   According to this configuration, after the electrolyte 13 is injected into the case 11 from the small diameter portion 32 of the hole 30 into which the electrolyte 13 can be injected, the seal member 33 is disposed on the bottom 31 b of the large diameter portion 31. The sealing member 33 is fixed in a state where the tightening force of the tightening member 35 is adjusted by the tightening member 35 fixed to the large diameter portion 31 in a state of being screwed with the female screw portion 31a of the large diameter portion 31. Since the seal member 33 is made of an elastic material, when the pressure in the case 11 becomes equal to or higher than a preset pressure due to overcharging or the like in the use state of the secondary battery 10, the gas in the case 11 passes through the small-diameter portion 32 and becomes large. It passes between the bottom part 31 b of the diameter part 31 and the contact part of the seal member 33. After passing through the gas passage hole 33a of the seal member 33 and the gas passage hole 34a of the holding plate 34, the gas is discharged through the through hole 35b of the fastening member 35, so that the seal member 33 functions as a safety valve.

また、シール部材33が弾性体製のため、シール部材33は、ケース11内の圧力が予め設定された圧力未満の時は、良好なシール機能を果たす。さらに、締付け部材35は、孔30の大径部31に螺合されているため、二次電池10を再使用する場合に、締付け部材35及び押さえ板34を取り外した後、シール部材33を取り外せば、孔30の小径部32を電解液補充孔として使用することができる。したがって、小径部(注液孔)32を二次電池(蓄電装置)10の再使用時に電解液補充孔として利用することができ、しかも、注液孔(小径部32)の封止構造が安全弁の役割を果たすことができる。   Since the seal member 33 is made of an elastic material, the seal member 33 performs a good sealing function when the pressure in the case 11 is lower than a preset pressure. Further, since the fastening member 35 is screwed into the large diameter portion 31 of the hole 30, when the secondary battery 10 is reused, the sealing member 33 can be removed after the fastening member 35 and the holding plate 34 are removed. For example, the small diameter portion 32 of the hole 30 can be used as an electrolyte replenishing hole. Therefore, the small diameter portion (liquid injection hole) 32 can be used as an electrolyte replenishing hole when the secondary battery (power storage device) 10 is reused, and the sealing structure of the liquid injection hole (small diameter portion 32) is a safety valve. Can play a role.

(2)締付け部材35は、ばね36及び押さえ板34を介してシール部材33に押圧力を付与する。締付け部材35は、ばね36及び押さえ板34を介さずにシール部材33に接触した状態で雌ねじ部31aに対する螺合量を調整することでシール部材33に対する押圧力を調整することも可能である。しかし、ばね36及び押さえ板34を介してシール部材33を押圧する方が、押圧力を目的の値に調整することが容易になる。   (2) The tightening member 35 applies a pressing force to the seal member 33 via the spring 36 and the pressing plate 34. The tightening member 35 can also adjust the pressing force on the seal member 33 by adjusting the screwing amount with respect to the female screw portion 31a in a state of being in contact with the seal member 33 without passing through the spring 36 and the pressing plate 34. However, pressing the seal member 33 via the spring 36 and the pressing plate 34 makes it easier to adjust the pressing force to a desired value.

(3)シール部材33の上には、シール部材33の気体通過孔33aと同じ位置に気体通過孔34aが形成された硬質の押さえ板34が配置され、シール部材33は押さえ板34を介して、締付け部材35から押圧力を受ける。この構成によれば、シール部材33は、硬質の押さえ板34を介して締付け部材35により押圧力を受けるため、締付け部材35による押圧力がシール部材33を均一に押圧し、シール部材33のシール機能が良好に作用する。   (3) A hard holding plate 34 having a gas passage hole 34 a formed at the same position as the gas passage hole 33 a of the seal member 33 is disposed on the seal member 33. , And receives a pressing force from the fastening member 35. According to this configuration, since the sealing member 33 receives the pressing force from the fastening member 35 via the hard holding plate 34, the pressing force from the fastening member 35 uniformly presses the sealing member 33, and the sealing of the sealing member 33 is performed. Function works well.

(4)締付け部材35の上面には、締付け部材35が大径部31の雌ねじ部31aと螺合する状態において、締付け部材35を回転させる工具を掛止するためのキー溝35cが形成されている。したがって、キー溝35cの延びる方向と、締付け部材35を雌ねじ部31aに螺合させるときの回転量とから、シール部材33に加わる締付け部材35による押圧力の調整が容易になる。   (4) On the upper surface of the tightening member 35, a key groove 35c for engaging a tool for rotating the tightening member 35 when the tightening member 35 is screwed with the female screw portion 31a of the large diameter portion 31 is formed. I have. Therefore, the adjustment of the pressing force by the tightening member 35 applied to the seal member 33 is facilitated based on the direction in which the key groove 35c extends and the amount of rotation when the tightening member 35 is screwed into the female screw portion 31a.

実施形態は前記に限定されるものではなく、例えば、次のように具体化してもよい。
○ 図4に示すように、蓋体15は、全体が一定の厚さではなく、注液孔(小径部32)及びその封止構造を構成する部分が設けられる箇所が突出する状態に形成されてもよい。この場合、蓋体15全体を厚く形成する必要がなく、軽量化に寄与する。
The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 4, the lid 15 is formed not in a uniform thickness as a whole, but in a state where a portion where a liquid injection hole (small-diameter portion 32) and a portion constituting a sealing structure thereof are provided protrudes. You may. In this case, it is not necessary to form the entire lid 15 thick, which contributes to weight reduction.

○ 締付け部材35は、上面に締付け部材35を回転させる工具を掛止するためのキー溝35cが形成されているねじに限らず、ボルトを使用してもよい。しかし、上面にキー溝35cが形成されているねじの方が、蓋体15の厚さを薄くすることができる。   The fastening member 35 is not limited to a screw in which a key groove 35c for engaging a tool for rotating the fastening member 35 is formed on the upper surface, and a bolt may be used. However, the screw having the key groove 35c formed on the upper surface can make the thickness of the lid 15 thinner.

○ 締付け部材35は、ばね36及び押さえ板34を介してシール部材33に押圧力を付与する構成に限らず、締付け部材35が直接押さえ板34に接触した状態で、雌ねじ部31aに対する螺合量を調整することでシール部材33に対する押圧力を調整するようにしてもよい。しかし、ばね36及び押さえ板34を介してシール部材33を押圧する構成の方が、押圧力を目的の値に調整することが容易になる。   The tightening member 35 is not limited to the configuration in which the pressing force is applied to the seal member 33 via the spring 36 and the pressing plate 34, and the screwing amount to the female screw portion 31 a in a state where the tightening member 35 directly contacts the pressing plate 34. May be adjusted to adjust the pressing force on the seal member 33. However, the configuration in which the seal member 33 is pressed via the spring 36 and the pressing plate 34 makes it easier to adjust the pressing force to a desired value.

○ ばね36は、圧縮コイルばねに限らず、例えば、竹の子ばねや板ばねを使用してもよい。しかし、圧縮コイルばねの方が、シール部材33に対して押圧力を均一に作用させ易い。   The spring 36 is not limited to a compression coil spring, and may be, for example, a bamboo shoot spring or a leaf spring. However, the compression coil spring is easier to apply the pressing force to the seal member 33 more uniformly.

○ シール部材33の上に、シール部材33と同じ位置に気体通過孔34aが形成された硬質の押さえ板34を配置せずに、ばね36が直接シール部材33を押圧する構成としてもよい。しかし、ばね36が直接シール部材33に当接してシール部材33を押圧する構成に比べて、ばね36が硬質の押さえ板34を介してシール部材33に押圧力を加える構成の方が、締付け部材35による押圧力がシール部材33を均一に押圧し、シール部材33のシール機能が良好に作用する。   A configuration in which the spring 36 directly presses the seal member 33 without arranging the hard pressing plate 34 in which the gas passage hole 34a is formed at the same position as the seal member 33 on the seal member 33 may be adopted. However, as compared with a configuration in which the spring 36 directly abuts on the seal member 33 and presses the seal member 33, a configuration in which the spring 36 applies a pressing force to the seal member 33 via the hard pressing plate 34 is a fastening member. The pressing force by 35 presses the sealing member 33 uniformly, and the sealing function of the sealing member 33 works well.

○ シール部材33と押さえ板34とを、予め一体に結合固着された部品として使用するようにしてもよい。この場合、注液孔(小径部32)の封止構造を構成する部品点数が少なくなり、小径部32から電解液13を注入した後、注液孔(小径部32)を封止する手間が少なくなる。   The seal member 33 and the holding plate 34 may be used as components which are integrally connected and fixed in advance. In this case, the number of components constituting the sealing structure for the liquid injection hole (small diameter portion 32) is reduced, and the time required to seal the liquid injection hole (small diameter portion 32) after injecting the electrolyte 13 from the small diameter portion 32 is reduced. Less.

○ 図5に示すように、ケース11は、前側が開放されたケース本体14と、その開口部を覆う蓋体15とで構成されていてもよい。この場合、電解液13を注入可能な孔30は、蓋体15ではなく、ケース11の上壁11aに形成される。   As shown in FIG. 5, the case 11 may be composed of a case body 14 having an open front side and a lid 15 covering the opening. In this case, the hole 30 into which the electrolyte 13 can be injected is formed not in the lid 15 but in the upper wall 11a of the case 11.

○ 大径部31は、雌ねじ部31aの径が、シール部材33及び押さえ板34が収容される部分の径と同じに形成されていてもよい。
○ 積層型の電極組立体12に限らず、巻回型の電極組立体を有する二次電池10に適用してもよい。
In the large diameter portion 31, the diameter of the female screw portion 31a may be formed to be the same as the diameter of the portion where the seal member 33 and the holding plate 34 are accommodated.
The present invention is not limited to the stacked electrode assembly 12 and may be applied to a secondary battery 10 having a wound electrode assembly.

○ 正極端子16と正極用の導電部材21あるいは負極端子17と負極用の導電部材22は、それぞれ別体に形成されたものを後から溶接あるいは接着材等で固着した構成に限らず、一体に形成された構成のものであってもよい。   The positive electrode terminal 16 and the conductive member 21 for the positive electrode or the negative electrode terminal 17 and the conductive member 22 for the negative electrode are not limited to a structure formed separately and fixed later by welding or an adhesive, but are integrally formed. The formed structure may be used.

○ 二次電池10は、リチウムイオン二次電池に限らず、ニッケル水素二次電池やニッケルカドミウム二次電池等の他の二次電池であってもよい。
○ 蓄電装置は、二次電池10に限らず、例えば、電気二重層キャパシタやリチウムイオンキャパシタ等のようなキャパシタであってもよい。
The secondary battery 10 is not limited to a lithium ion secondary battery, and may be another secondary battery such as a nickel hydride secondary battery or a nickel cadmium secondary battery.
The power storage device is not limited to the secondary battery 10 and may be, for example, a capacitor such as an electric double layer capacitor or a lithium ion capacitor.

10…蓄電装置としての二次電池、11…ケース、11a…上壁、12…電極組立体、13…電解液、15…上壁としての蓋体、30…孔、31…大径部、31a…雌ねじ部、31b…底部、32…小径部、33…シール部材、33a,34a…気体通過孔、34…押さえ板、35…締付け部材、35b…貫通孔、36…ばね。   DESCRIPTION OF SYMBOLS 10 ... Rechargeable battery as a power storage device, 11 ... Case, 11a ... Top wall, 12 ... Electrode assembly, 13 ... Electrolyte, 15 ... Lid as top wall, 30 ... Hole, 31 ... Large diameter part, 31a ... female screw part, 31b ... bottom part, 32 ... small diameter part, 33 ... sealing member, 33a, 34a ... gas passage hole, 34 ... holding plate, 35 ... fastening member, 35b ... through hole, 36 ... spring.

Claims (2)

電極組立体が収容されたケースの上壁に電解液を注入可能な孔が形成された蓄電装置であって、
前記孔は、雌ねじ部が形成された大径部と、その底部に形成された小径部とが連続する状態で形成され、前記底部には前記底部を覆いかつ前記小径部と重ならない位置に気体通過孔が形成された弾性体製のシール部材が配置され、前記大径部には前記雌ねじ部と螺合し、かつ貫通孔が軸方向に形成された締付け部材が、前記シール部材を前記底部に押圧する押圧力が調整可能に取り付けられており、
前記シール部材の上には、前記シール部材と同じ位置に気体通過孔が形成された硬質の押さえ板が配置され、前記シール部材は前記押さえ板を介して、前記締付け部材から前記押圧力を受けることを特徴とする蓄電装置。
A power storage device in which a hole through which an electrolyte can be injected is formed on an upper wall of a case in which the electrode assembly is housed,
The hole is formed in a state where a large-diameter portion formed with a female screw portion and a small-diameter portion formed at the bottom thereof are continuous with each other, and the bottom is covered with a gas at a position covering the bottom and not overlapping the small-diameter portion. A sealing member made of an elastic body having a through hole formed therein is disposed, and a fastening member screwed to the female screw portion in the large diameter portion, and a through hole is formed in the axial direction. The pressing force to press on is mounted so that it can be adjusted ,
A hard pressing plate having a gas passage hole formed at the same position as the sealing member is disposed on the sealing member, and the sealing member receives the pressing force from the tightening member via the pressing plate. A power storage device, comprising:
前記締付け部材は、ばねを介して前記シール部材に押圧力を付与する請求項1に記載の蓄電装置。
The power storage device according to claim 1, wherein the fastening member applies a pressing force to the seal member via a spring.
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