JP2014044871A - Power storage device - Google Patents
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- JP2014044871A JP2014044871A JP2012186728A JP2012186728A JP2014044871A JP 2014044871 A JP2014044871 A JP 2014044871A JP 2012186728 A JP2012186728 A JP 2012186728A JP 2012186728 A JP2012186728 A JP 2012186728A JP 2014044871 A JP2014044871 A JP 2014044871A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
Abstract
Description
本発明は、蓋の内面と、この内面に対向する電極端子との間を絶縁する絶縁部材を有する蓄電装置に関する。 The present invention relates to a power storage device having an insulating member that insulates between an inner surface of a lid and an electrode terminal facing the inner surface.
従来、二次電池（蓄電装置）のケースは、ケース本体と蓋が別部品として構成されている。また、ケース本体内に収容された電極組立体には、電極端子が導電部材を介して電気的に接続されているため、電極端子と蓋とは絶縁されている。電極端子と蓋との絶縁構造としては、例えば、特許文献１が挙げられる。 2. Description of the Related Art Conventionally, a case of a secondary battery (power storage device) is configured with a case body and a lid as separate parts. In addition, since the electrode terminal is electrically connected to the electrode assembly housed in the case body via the conductive member, the electrode terminal and the lid are insulated. As an insulating structure between the electrode terminal and the lid, for example, Patent Document 1 can be cited.
図８に示すように、特許文献１の電池８０は、外装缶８１内に電極群８２を収容して形成されている。外装缶８１の開口部には蓋８４が溶接されるとともに、蓋８４には貫通孔８４ａが形成されている。蓋８４には、正極及び負極の端子部８３が設けられている。各端子部８３は、電極群８２のタブ８２ａに溶接されるリード８５を備えるとともに、このリード８５には貫通孔８５ａが形成されている。また、各端子部８３は、リード８５と、蓋８４の内面との間に配置される矩形板状の内部絶縁体８６を備えるとともに、この内部絶縁体８６には貫通孔８６ａが形成されている。各端子部８３は、蓋８４の外面側に配置される筒状の絶縁部材８７を備えるとともに、この絶縁部材８７内に収容される外部端子８８を備える。 As shown in FIG. 8, the battery 80 of Patent Document 1 is formed by housing an electrode group 82 in an outer can 81. A lid 84 is welded to the opening of the outer can 81, and a through hole 84 a is formed in the lid 84. The lid 84 is provided with positive and negative terminal portions 83. Each terminal portion 83 includes a lead 85 welded to the tab 82 a of the electrode group 82, and a through hole 85 a is formed in the lead 85. Each terminal portion 83 includes a rectangular plate-like internal insulator 86 disposed between the lead 85 and the inner surface of the lid 84, and a through hole 86 a is formed in the internal insulator 86. . Each terminal portion 83 includes a cylindrical insulating member 87 disposed on the outer surface side of the lid 84, and includes an external terminal 88 accommodated in the insulating member 87.
外部端子８８は、頭部８８ａと、この頭部８８ａから延出し、かつ蓋８４の貫通孔８４ａにかしめ固定される軸部８８ｂを有する。そして、外部端子８８の軸部８８ｂが絶縁部材８７、蓋８４の貫通孔８４ａ、及び内部絶縁体８６の貫通孔８６ａを貫通してリード８５にかしめ固定されて、リード８５と外部端子８８が電気的に接続されている。また、内部絶縁体８６は、蓋８４とリード８５とを絶縁し、絶縁部材８７は、蓋８４と外部端子８８とを絶縁している。 The external terminal 88 includes a head portion 88 a and a shaft portion 88 b that extends from the head portion 88 a and is fixed by caulking to the through hole 84 a of the lid 84. Then, the shaft portion 88b of the external terminal 88 passes through the insulating member 87, the through hole 84a of the lid 84, and the through hole 86a of the internal insulator 86 and is caulked and fixed to the lead 85, so that the lead 85 and the external terminal 88 are electrically connected. Connected. The internal insulator 86 insulates the lid 84 and the lead 85, and the insulating member 87 insulates the lid 84 and the external terminal 88.
ところで、特許文献１において、外部端子８８を蓋８４にかしめ固定する際、外部端子８８は、各貫通孔８４ａ，８６ａを貫通してリード８５の貫通孔８５ａに挿通される。そして、外部端子８８は軸部８８ｂを軸方向に加圧することでリード８５にかしめ固定される。このかしめ固定の際、内部絶縁体８６が、外部端子８８を回動中心として回動してしまう。その結果、内部絶縁体８６を蓋８４とリード８５との間の所定位置に位置させることができなくなる虞がある。 Incidentally, in Patent Document 1, when the external terminal 88 is caulked and fixed to the lid 84, the external terminal 88 passes through the through holes 84 a and 86 a and is inserted into the through hole 85 a of the lead 85. The external terminal 88 is caulked and fixed to the lead 85 by pressing the shaft portion 88b in the axial direction. When the caulking is fixed, the internal insulator 86 rotates around the external terminal 88 as a rotation center. As a result, the internal insulator 86 may not be positioned at a predetermined position between the lid 84 and the lead 85.
本発明は、ナットを螺合する際における絶縁部材の位置ずれを防止することができる蓄電装置を提供することにある。 An object of the present invention is to provide a power storage device that can prevent displacement of an insulating member when a nut is screwed.
上記問題点を解決するために、請求項１に記載の発明は、開口部を有するケース本体と、前記開口部を閉塞する蓋と、前記ケース本体内に収容された電極組立体と、前記蓋に形成された挿通孔を通って前記蓋から突出した極柱部と、前記極柱部の両端部のうち前記ケース本体内側の端部に設けられ、前記挿通孔の面積よりも大きい断面積を有する基部とを有し、前記電極組立体と電気的に接続された電極端子と、前記極柱部に螺合されて前記電極端子の前記基部と共に前記蓋を挟持するナットと、前記蓋の内面と、該内面に対向する前記電極端子の前記基部との間を絶縁する絶縁部材と、を有する蓄電装置であって、前記基部において、前記蓋の内面と対向する面を端面とするとともに、該端面に交わる面であり、かつ前記基部の外形を形成する面を前記基部の側面とすると、前記絶縁部材は、前記蓋の内面と、前記基部の端面との間に配置される蓋側絶縁板を有し、該蓋側絶縁板には、前記極柱部が挿通される挿通部が形成されており、前記基部には、係合凹部及び係合凸部の少なくとも一方が形成され、前記絶縁部材には、前記基部の前記係合凹部と係合する係合凸部及び前記基部の前記係合凸部と係合する係合凹部の少なくとも一方が形成されていることを要旨とする。 In order to solve the above problem, the invention according to claim 1 is a case main body having an opening, a lid for closing the opening, an electrode assembly housed in the case main body, and the lid. A pole column projecting from the lid through the insertion hole formed on the inner side of the case body, and having a cross-sectional area larger than the area of the insertion hole. An electrode terminal that is electrically connected to the electrode assembly, a nut that is screwed into the pole column and sandwiches the lid together with the base of the electrode terminal, and an inner surface of the lid And an insulating member that insulates the base portion of the electrode terminal facing the inner surface, wherein the base portion has a surface facing the inner surface of the lid as an end surface, It is a surface that intersects the end surface and forms the outer shape of the base The insulating member has a lid-side insulating plate disposed between the inner surface of the lid and the end surface of the base, and the lid-side insulating plate includes the electrode. An insertion portion through which the column portion is inserted is formed, and at least one of an engagement concave portion and an engagement convex portion is formed on the base portion, and the insulating member is engaged with the engagement concave portion of the base portion. The gist is that at least one of an engaging convex portion that engages with the engaging convex portion of the base portion is formed.
これによれば、基部の係合凹部と絶縁部材の係合凸部との係合、及び基部の係合凸部と絶縁部材の係合凹部との係合の少なくとも一方により、基部の端面に沿った絶縁部材の移動が規制できる。このため、電極端子の極柱部にナットを螺合するとき、振動等が発生しても絶縁部材が、基部の端面に沿う方向へ位置ずれすることを防止することができる。 According to this, at least one of engagement between the engagement concave portion of the base portion and the engagement convex portion of the insulating member, and engagement between the engagement convex portion of the base portion and the engagement concave portion of the insulating member, the end surface of the base portion is formed. The movement of the insulating member along can be regulated. For this reason, when the nut is screwed onto the pole column portion of the electrode terminal, the insulating member can be prevented from being displaced in the direction along the end surface of the base portion even if vibration or the like occurs.
また、前記絶縁部材は、前記蓋側絶縁板の端縁から前記蓋から離れる方向に向けて延び、前記ケース本体と前記基部の側面との間を絶縁するケース側絶縁板を有し、前記絶縁部材の前記係合凹部及び前記絶縁部材の前記係合凸部の少なくとも一方が前記ケース側絶縁板における前記基部の前記側面との対向面に形成されていてもよい。 The insulating member includes a case-side insulating plate that extends from an edge of the lid-side insulating plate in a direction away from the lid, and insulates between the case main body and a side surface of the base portion. At least one of the engaging concave portion of the member and the engaging convex portion of the insulating member may be formed on a surface of the case side insulating plate facing the side surface of the base portion.
これによれば、ケース側絶縁板は、電極端子と、ケース本体を絶縁するために設けられている。よって、電極端子に対する絶縁部材の位置ずれを防止するための構成を、絶縁部材の一部に形成しており、ケース本体内の部品点数を増加させることなく、絶縁部材の位置ずれを防止することができる。 According to this, the case side insulating plate is provided to insulate the electrode terminal from the case main body. Therefore, the structure for preventing the displacement of the insulating member with respect to the electrode terminal is formed in a part of the insulating member, and the displacement of the insulating member is prevented without increasing the number of parts in the case body. Can do.
また、前記蓋側絶縁板には、前記挿通部に連通し、かつ前記蓋側絶縁板の側方に開口する切れ込み状の連通部が形成され、前記ケース側絶縁板には、前記蓋側絶縁板と同じ方向に向けて前記ケース側絶縁板から前記基部の前記端面とは反対側の面に沿って延びる組立体側絶縁板が形成されていてもよい。 The lid-side insulating plate is formed with a notch-like communicating portion that communicates with the insertion portion and opens to the side of the lid-side insulating plate. The case-side insulating plate has the lid-side insulating plate. An assembly-side insulating plate extending from the case-side insulating plate along the surface opposite to the end surface of the base in the same direction as the plate may be formed.
これによれば、絶縁部材を電極端子に向けてスライド移動させることで、極柱部を連通部を介して挿通部に配置することができ、絶縁部材を電極端子の側方から装着することができる。このため、ケース側絶縁板に形成された係合凸部及び係合凹部の少なくとも一方を、基部に対する絶縁部材の装着と同時に、基部の係合凹部及び係合凸部の少なくとも一方に係合させることができる。 According to this, by slidably moving the insulating member toward the electrode terminal, the pole column portion can be disposed in the insertion portion via the communication portion, and the insulating member can be mounted from the side of the electrode terminal. it can. For this reason, at least one of the engaging convex portion and the engaging concave portion formed on the case-side insulating plate is engaged with at least one of the engaging concave portion and the engaging convex portion of the base at the same time when the insulating member is attached to the base portion. be able to.
また、前記基部の側面は、前記ケース側絶縁板に接触する部分が平面状に形成されているとともに、前記ケース側絶縁板に面接触していてもよい。
これによれば、基部の係合凹部と絶縁部材の係合凸部との係合、及び基部の係合凸部と絶縁部材の係合凹部との係合の少なくとも一方を形成した状態では、ケース側絶縁板と、基部の側面が面接触する。このため、絶縁部材を安定した状態に位置決めすることができ、絶縁部材の位置ずれを防止することができる。
Further, the side surface of the base portion may be formed in a planar shape in contact with the case-side insulating plate, and may be in surface contact with the case-side insulating plate.
According to this, in a state in which at least one of the engagement between the engagement concave portion of the base and the engagement convex portion of the insulating member and the engagement of the engagement convex portion of the base and the engagement concave portion of the insulating member is formed, The case-side insulating plate and the side surface of the base are in surface contact. For this reason, the insulating member can be positioned in a stable state, and the displacement of the insulating member can be prevented.
また、前記基部の前記側面には互いに平行な平面部が形成されていてもよい。
また、前記係合凸部及び係合凹部の少なくとも一方は複数設けられていてもよい。
これによれば、基部の係合凸部と絶縁部材の係合凹部との係合箇所、及び基部の係合凹部と絶縁部材の係合凸部との係合箇所が複数になり、絶縁部材の位置ずれを確実に防止することができる。
In addition, plane portions parallel to each other may be formed on the side surface of the base portion.
Further, a plurality of at least one of the engaging convex portion and the engaging concave portion may be provided.
According to this, the engagement part of the engagement convex part of a base part and the engagement recessed part of an insulating member, and the engagement part of the engagement concave part of a base part and the engagement convex part of an insulation member become plurality, and an insulation member Can be reliably prevented.
また、前記蓄電装置は二次電池である。 The power storage device is a secondary battery.
本発明によれば、ナットの螺合の際における絶縁部材の位置ずれを防止することができる。 According to the present invention, it is possible to prevent the displacement of the insulating member when the nut is screwed.
以下、本発明を具体化した一実施形態を図１〜図７にしたがって説明する。
図１及び図２に示すように、蓄電装置としての二次電池１０において、金属製のケース１２には電極組立体２０が収容されている。ケース１２は、開口部１３ｄを有する直方体状のケース本体１３と、ケース本体１３の開口部１３ｄを閉塞する矩形平板状の蓋１４とからなる。ケース本体１３と蓋１４は、何れも金属製（例えば、ステンレスやアルミニウム）であり、ケース本体１３と蓋１４はレーザー溶接によって接合されている。ケース本体１３は、長方形状の底板１３ａと、底板１３ａの対向する一対の短側縁から立設された短側壁１３ｂと、底板１３ａの対向する一対の長側縁から立設された長側壁１３ｃとから形成されている。また、本実施形態の二次電池１０は、その外周が角型をなす角型電池である。また、本実施形態の二次電池１０は、リチウムイオン電池である。
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, in a secondary battery 10 as a power storage device, an electrode assembly 20 is accommodated in a metal case 12. The case 12 includes a rectangular parallelepiped case main body 13 having an opening 13 d and a rectangular flat plate-shaped lid 14 that closes the opening 13 d of the case main body 13. The case body 13 and the lid 14 are both made of metal (for example, stainless steel or aluminum), and the case body 13 and the lid 14 are joined by laser welding. The case body 13 includes a rectangular bottom plate 13a, a short side wall 13b erected from a pair of opposed short side edges of the bottom plate 13a, and a long side wall 13c erected from a pair of long side edges of the bottom plate 13a. And is formed from. Further, the secondary battery 10 of the present embodiment is a prismatic battery whose outer periphery forms a square shape. Further, the secondary battery 10 of the present embodiment is a lithium ion battery.
図６に示すように、電極組立体２０は、正極電極２１と負極電極２２と、を備えるとともに、正極電極２１と負極電極２２の間を絶縁するセパレータ２３を介在させて層状をなす積層体とされている。正極電極２１は、矩形状の正極用金属箔（本実施形態ではアルミニウム箔）２１ａと、その正極用金属箔２１ａの両面に形成された正極活物質層２１ｂとを有する。負極電極２２は、矩形状の負極用金属箔（本実施形態では銅箔）２２ａと、その負極用金属箔２２ａの両面に形成された負極活物質層２２ｂとを有する。 As shown in FIG. 6, the electrode assembly 20 includes a positive electrode 21 and a negative electrode 22, and a laminated body having a layer shape with a separator 23 interposed between the positive electrode 21 and the negative electrode 22. Has been. The positive electrode 21 includes a rectangular metal foil for positive electrode (in this embodiment, an aluminum foil) 21a, and a positive electrode active material layer 21b formed on both surfaces of the metal foil for positive electrode 21a. The negative electrode 22 includes a rectangular negative electrode metal foil (copper foil in the present embodiment) 22a and negative electrode active material layers 22b formed on both surfaces of the negative electrode metal foil 22a.
正極電極２１の第１端部２１ｃ（一辺方向（長辺方向））の一部には、正極用金属箔２１ａを延出させて形成された正極集電タブ３１が設けられている。正極集電タブ３１は、電極組立体２０を構成する各正極電極２１において同位置に同一形状で形成されている。負極電極２２の第１端部２２ｃ（一辺方向（長辺方向））の一部には、負極用金属箔２２ａを延出させて形成された負極集電タブ３２が設けられている。負極集電タブ３２は、電極組立体２０を構成する各負極電極２２において同位置に同一形状で形成されている。 A positive electrode current collecting tab 31 formed by extending the positive electrode metal foil 21 a is provided at a part of the first end 21 c (one side direction (long side direction)) of the positive electrode 21. The positive electrode current collecting tab 31 is formed in the same position and in the same shape in each positive electrode 21 constituting the electrode assembly 20. A negative electrode current collecting tab 32 formed by extending the negative electrode metal foil 22a is provided at a part of the first end 22c (one side direction (long side direction)) of the negative electrode 22. The negative electrode current collecting tab 32 is formed in the same position and in the same shape in each negative electrode 22 constituting the electrode assembly 20.
図１に示すように、電極組立体２０を構成する正極電極２１は、それぞれの正極集電タブ３１が積層方向に沿って列状に配置されるように積層される。同様に、電極組立体２０を構成する負極電極２２は、それぞれの負極集電タブ３２が、正極集電タブ３１と重ならないように積層方向に沿って列状に配置されるように積層される。そして、複数の正極集電タブ３１は、電極組立体２０における積層方向の一端から他端までの範囲に集められる。また、複数の負極集電タブ３２も同様に、電極組立体２０における積層方向の一端から他端までの範囲に集められる。 As shown in FIG. 1, the positive electrodes 21 constituting the electrode assembly 20 are stacked such that the respective positive electrode current collecting tabs 31 are arranged in a row along the stacking direction. Similarly, the negative electrode 22 constituting the electrode assembly 20 is laminated so that the respective negative electrode current collecting tabs 32 are arranged in a row along the lamination direction so as not to overlap the positive electrode current collecting tabs 31. . The plurality of positive electrode current collecting tabs 31 are collected in a range from one end to the other end of the electrode assembly 20 in the stacking direction. Similarly, the plurality of negative electrode current collecting tabs 32 are collected in a range from one end to the other end in the stacking direction of the electrode assembly 20.
電極組立体２０には、正極集電タブ３１を集めてなる正極タブ群４５が形成されている。この正極タブ群４５の少なくとも最外の正極集電タブ３１が、導電部材としての正極導電部材３３と溶接されている。また、電極組立体２０には、負極集電タブ３２を集めてなる負極タブ群４６が形成されている。この負極タブ群４６の少なくとも最外の負極集電タブ３２が、導電部材としての負極導電部材３７と溶接されている。 The electrode assembly 20 has a positive electrode tab group 45 formed by collecting positive electrode current collecting tabs 31. At least the outermost positive electrode current collecting tab 31 of the positive electrode tab group 45 is welded to a positive electrode conductive member 33 as a conductive member. The electrode assembly 20 has a negative electrode tab group 46 formed by collecting the negative electrode current collecting tabs 32. At least the outermost negative electrode current collecting tab 32 of the negative electrode tab group 46 is welded to a negative electrode conductive member 37 as a conductive member.
図１及び図５（ａ）に示すように、正極導電部材３３及び負極導電部材３７は、四角板状をなす端子接続部３４を有する。端子接続部３４において、後述の正極端子４１又は負極端子４２が溶接される面を第１面３４ａとし、第１面３４ａと反対側の面を第２面３４ｂとする。正極導電部材３３及び負極導電部材３７は、第２面３４ｂから第１面３４ａに向けて立ち上がる立上げ部３５を有するとともに、端子接続部３４から離れる方向に向けて立上げ部３５から矩形状に延びるタブ溶接部３６を有する。タブ溶接部３６において、電極組立体２０側の面がタブ溶接面３６ａとなっており、タブ溶接面３６ａと反対側の面が蓋側対向面３６ｂとなっている。 As shown in FIGS. 1 and 5 (a), the positive electrode conductive member 33 and the negative electrode conductive member 37 have a terminal connection portion 34 having a square plate shape. In the terminal connection portion 34, a surface to which a later-described positive electrode terminal 41 or negative electrode terminal 42 is welded is a first surface 34a, and a surface opposite to the first surface 34a is a second surface 34b. The positive electrode conductive member 33 and the negative electrode conductive member 37 have a rising portion 35 that rises from the second surface 34b toward the first surface 34a, and has a rectangular shape from the rising portion 35 in a direction away from the terminal connection portion 34. It has a tab weld 36 that extends. In the tab weld portion 36, the surface on the electrode assembly 20 side is a tab weld surface 36a, and the surface opposite to the tab weld surface 36a is a lid-side facing surface 36b.
正極導電部材３３において、端子接続部３４の第１面３４ａには、電極端子としての正極端子４１が溶接されるとともに、負極導電部材３７において、端子接続部３４の第１面３４ａには、電極端子としての負極端子４２が溶接されている。図４に示すように、正極端子４１及び負極端子４２は、それぞれ四角板状をなす基部４３を有するとともに、この基部４３の平面形状は、各端子接続部３４における第１面３４ａの平面形状とほぼ同じになっている。また、基部４３の厚みは、第１面３４ａからの立上げ部３５の高さと同じになっている。ただし、基部４３の厚みは、これに限定されるものではない。そして、基部４３において、蓋１４の内面１４ａに対向する面を蓋側端面４３ａとするとともに、基部４３の厚み方向に蓋側端面４３ａと反対側の面を溶接側端面４３ｂとすると、蓋側端面４３ａはタブ溶接部３６の蓋側対向面３６ｂと同一面上に位置している。ただし、これに限定されるものではない。 In the positive electrode conductive member 33, a positive terminal 41 as an electrode terminal is welded to the first surface 34 a of the terminal connection portion 34, and in the negative electrode conductive member 37, an electrode is formed on the first surface 34 a of the terminal connection portion 34. A negative terminal 42 as a terminal is welded. As shown in FIG. 4, each of the positive terminal 41 and the negative terminal 42 has a base portion 43 having a square plate shape, and the planar shape of the base portion 43 is the same as the planar shape of the first surface 34 a in each terminal connection portion 34. It is almost the same. Further, the thickness of the base portion 43 is the same as the height of the rising portion 35 from the first surface 34a. However, the thickness of the base 43 is not limited to this. Then, in the base portion 43, the surface facing the inner surface 14 a of the lid 14 is a lid side end surface 43 a and the surface opposite to the lid side end surface 43 a in the thickness direction of the base portion 43 is a welding side end surface 43 b. 43 a is located on the same plane as the lid-side facing surface 36 b of the tab weld 36. However, it is not limited to this.
基部４３の中央からは円筒状の極柱部４４が立設され、蓋側端面４３ａは極柱部４４を取り囲んでいる。極柱部４４の外周面には雄ねじ４４ａが形成されるとともに、極柱部４４の内周面には雌ねじ４４ｂが形成されている。基部４３において、蓋側端面４３ａ及び溶接側端面４３ｂに垂直に交わる面であり、基部４３の外形を形成する面を基部４３の側面４３ｃとすると、基部４３には、極柱部４４を挟む一対の側面４３ｃの組が二つ形成されている。また、基部４３の側面４３ｃには、極柱部４４を挟んで互いに平行な平面部Ｈが形成されている。さらに、図１及び図５（ｂ）に示すように、基部４３の一つの側面４３ｃであり、短側壁１３ｂの内面に対向する側面４３ｃには、四角穴状の係合凹部４３ｆが形成されている。 A cylindrical pole column 44 is erected from the center of the base 43, and the lid-side end surface 43 a surrounds the pole column 44. A male screw 44 a is formed on the outer peripheral surface of the pole column portion 44, and a female screw 44 b is formed on the inner peripheral surface of the pole column portion 44. In the base portion 43, a surface perpendicular to the lid-side end surface 43 a and the welding-side end surface 43 b, and a surface forming the outer shape of the base portion 43 is a side surface 43 c of the base portion 43. Two sets of side surfaces 43c are formed. Further, on the side surface 43 c of the base portion 43, plane portions H that are parallel to each other with the pole column portion 44 interposed therebetween are formed. Further, as shown in FIG. 1 and FIG. 5B, a square hole-shaped engaging recess 43f is formed on one side surface 43c of the base portion 43 and on the side surface 43c facing the inner surface of the short side wall 13b. Yes.
図１及び図６に示すように、基部４３には、樹脂製の絶縁部材５０が装着されている。絶縁部材５０は、基部４３の蓋側端面４３ａと、蓋１４の内面１４ａとの間に配置される蓋側絶縁板５１を有する。蓋側絶縁板５１には、極柱部４４が挿通される挿通部５１ａが厚み方向に貫通形成され、蓋側絶縁板５１の内周縁は円弧状に形成されている。また、蓋側絶縁板５１には、挿通部５１ａを蓋側絶縁板５１の一側方である負極導電部材３７に向けて開口させる切れ込み状の連通部５１ｂが形成され、挿通部５１ａと連通部５１ｂが形成されることで、蓋側絶縁板５１は平面視Ｕ字状に形成されている。蓋側絶縁板５１の内側縁には、連通部５１ｂを挟んで対向する突部５１ｃが連通部５１ｂに向けて形成されている。 As shown in FIGS. 1 and 6, a resin insulating member 50 is attached to the base 43. The insulating member 50 includes a lid-side insulating plate 51 that is disposed between the lid-side end surface 43 a of the base portion 43 and the inner surface 14 a of the lid 14. The lid-side insulating plate 51 is formed with an insertion portion 51a through which the pole column portion 44 is inserted in the thickness direction, and the inner peripheral edge of the lid-side insulating plate 51 is formed in an arc shape. Further, the lid-side insulating plate 51 is formed with a notch-like communication portion 51b that opens the insertion portion 51a toward the negative electrode conductive member 37 that is one side of the lid-side insulation plate 51, and is connected to the insertion portion 51a. By forming 51b, the lid-side insulating plate 51 is formed in a U shape in plan view. On the inner edge of the lid-side insulating plate 51, a projecting portion 51c that faces the communication portion 51b is formed toward the communication portion 51b.
図５（ａ）に示すように、蓋側絶縁板５１の端縁のうち、挿通部５１ａを挟んだ連通部５１ｂと反対側の端縁には、矩形状のケース側絶縁板５２が蓋１４から離れる方向に向けて延設されている。ここで、蓋側絶縁板５１における突部５１ｃの対向する方向を、絶縁部材５０の幅方向とすると、この幅方向に沿ったケース側絶縁板５２の長さは、極柱部４４を挟んだ一組の側面４３ｃにおける平面部Ｈ同士の距離よりも若干長くなっている。ケース側絶縁板５２において、基部４３の側面４３ｃとの対向面には、係合凸部としての係合突起５２ａが形成されている。係合突起５２ａは、ケース側絶縁板５２から蓋側絶縁板５１が延びる方向と同じ方向に向けて突出している。係合突起５２ａは、絶縁部材５０の幅方向の中央であり、蓋側絶縁板５１からの延設方向の中央に形成されている。また、係合突起５２ａは、四角柱状をなし、正極端子４１及び負極端子４２の基部４３に形成された係合凹部４３ｆに係合可能に形成されている。 As shown in FIG. 5 (a), a rectangular case-side insulating plate 52 is attached to the lid 14 at the end of the lid-side insulating plate 51 opposite to the communicating portion 51b across the insertion portion 51a. It is extended toward the direction away from. Here, when the direction in which the protrusions 51 c of the lid-side insulating plate 51 are opposed to each other is the width direction of the insulating member 50, the length of the case-side insulating plate 52 along the width direction sandwiches the pole column portion 44. It is slightly longer than the distance between the flat surface portions H in the set of side surfaces 43c. In the case-side insulating plate 52, an engagement protrusion 52a as an engagement protrusion is formed on the surface of the base 43 that faces the side surface 43c. The engagement protrusion 52 a protrudes in the same direction as the direction in which the lid-side insulating plate 51 extends from the case-side insulating plate 52. The engagement protrusion 52 a is formed at the center in the width direction of the insulating member 50 and in the center in the extending direction from the lid-side insulating plate 51. Further, the engagement protrusion 52 a has a quadrangular prism shape and is formed so as to be engageable with an engagement recess 43 f formed in the base portion 43 of the positive terminal 41 and the negative terminal 42.
また、ケース側絶縁板５２の蓋側絶縁板５１からの延設長さは、基部４３の厚みより長く設定されている。ケース側絶縁板５２において、蓋１４から離れた側の先端には、矩形板状の組立体側絶縁板５３が蓋側絶縁板５１と同じ方向に向けて、かつ溶接側端面４３ｂに沿って延設されている。そして、蓋側絶縁板５１と組立体側絶縁板５３の対向面同士の間隔は、基部４３の厚みより若干長く設定されている。また、絶縁部材５０の幅方向に沿った組立体側絶縁板５３の長さは、極柱部４４を挟んだ一組の平面部Ｈ同士間の距離よりも短くなっている。すなわち、組立体側絶縁板５３において、基部４３の平面部Ｈに垂直な方向に沿った長さは、基部４３の対向する平面部Ｈ間の長さより短くなっている。 The extension length of the case-side insulating plate 52 from the lid-side insulating plate 51 is set to be longer than the thickness of the base portion 43. In the case-side insulating plate 52, a rectangular plate-like assembly-side insulating plate 53 extends in the same direction as the lid-side insulating plate 51 and extends along the welding-side end surface 43 b at the tip of the case-side insulating plate 52. Has been. The distance between the facing surfaces of the lid-side insulating plate 51 and the assembly-side insulating plate 53 is set slightly longer than the thickness of the base portion 43. In addition, the length of the assembly-side insulating plate 53 along the width direction of the insulating member 50 is shorter than the distance between the pair of flat surface portions H sandwiching the pole column portion 44. That is, in the assembly-side insulating plate 53, the length along the direction perpendicular to the planar portion H of the base portion 43 is shorter than the length between the opposing planar portions H of the base portion 43.
図１に示すように、上記構成の絶縁部材５０は、正極端子４１及び負極端子４２に対し、ケース本体１３の短側壁１３ｂ側から装着されている。この装着状態では、蓋側絶縁板５１の挿通部５１ａには極柱部４４が挿通され、蓋側絶縁板５１が極柱部４４のほぼ全周を取り囲んでいる。また、蓋側絶縁板５１は基部４３の蓋側端面４３ａ上に支持されている。 As shown in FIG. 1, the insulating member 50 having the above configuration is attached to the positive terminal 41 and the negative terminal 42 from the side of the short side wall 13 b of the case body 13. In this mounted state, the pole column portion 44 is inserted into the insertion portion 51 a of the lid side insulating plate 51, and the lid side insulating plate 51 surrounds almost the entire circumference of the pole column portion 44. The lid-side insulating plate 51 is supported on the lid-side end surface 43 a of the base 43.
図４に示すように、基部４３の蓋側端面４３ａ上には、シール部材としてのＯリング５６が極柱部４４を取り囲む状態に設けられている。Ｏリング５６は、蓋側絶縁板５１の挿通部５１ａ内に配置されるとともに、Ｏリング５６は、ほぼ全周が蓋側絶縁板５１によって取り囲まれている。すなわち、Ｏリング５６は、連通部５１ｂと対向する部位以外は、蓋側絶縁板５１の内周縁によって取り囲まれ、蓋側絶縁板５１によって極柱部４４の外周に位置する状態に位置決めされている。 As shown in FIG. 4, an O-ring 56 as a seal member is provided on the lid-side end surface 43 a of the base portion 43 so as to surround the pole column portion 44. The O-ring 56 is disposed in the insertion portion 51 a of the lid-side insulating plate 51, and the O-ring 56 is surrounded by the lid-side insulating plate 51 on almost the entire circumference. That is, the O-ring 56 is surrounded by the inner peripheral edge of the lid-side insulating plate 51 except for the portion facing the communication portion 51b, and is positioned by the lid-side insulating plate 51 so as to be positioned on the outer periphery of the pole column portion 44. .
ケース側絶縁板５２において、側面４３ｃに対向する面は平面状に形成されている。このため、基部４３の側面４３ｃは、その平面部Ｈがケース側絶縁板５２に面接触している。また、この面接触した側面４３ｃの係合凹部４３ｆには、ケース側絶縁板５２の係合突起５２ａが係合している。組立体側絶縁板５３は、基部４３の溶接側端面４３ｂより電極組立体２０側に配置されるとともに、蓋側端面４３ａと反対側の溶接側端面４３ｂに沿って延びている。そして、組立体側絶縁板５３は、基部４３と電極組立体２０との間に介装されている。蓋側絶縁板５１は、基部４３の蓋側端面４３ａと蓋１４の内面１４ａとの間に配置され、蓋側絶縁板５１により、蓋１４と正極端子４１及び負極端子４２が電気的に絶縁されている。また、ケース側絶縁板５２により、ケース本体１３と、正極端子４１及び負極端子４２とが電気的に絶縁されている。さらに、組立体側絶縁板５３により、電極組立体２０と正極端子４１及び負極端子４２とが電気的に絶縁されている。 In the case-side insulating plate 52, the surface facing the side surface 43c is formed in a flat shape. For this reason, as for the side surface 43c of the base 43, the plane part H is in surface contact with the case-side insulating plate 52. Further, the engagement protrusions 52a of the case-side insulating plate 52 are engaged with the engagement recesses 43f of the side surface 43c in contact with the surface. The assembly-side insulating plate 53 is disposed closer to the electrode assembly 20 than the welding-side end surface 43b of the base portion 43, and extends along the welding-side end surface 43b opposite to the lid-side end surface 43a. The assembly-side insulating plate 53 is interposed between the base 43 and the electrode assembly 20. The lid-side insulating plate 51 is disposed between the lid-side end surface 43a of the base 43 and the inner surface 14a of the lid 14, and the lid 14, the positive terminal 41, and the negative terminal 42 are electrically insulated by the lid-side insulating plate 51. ing. In addition, the case main body 13 is electrically insulated from the positive terminal 41 and the negative terminal 42 by the case-side insulating plate 52. Further, the assembly side insulating plate 53 electrically insulates the electrode assembly 20 from the positive terminal 41 and the negative terminal 42.
図１及び図３に示すように、蓋側絶縁板５１の挿通部５１ａに挿通された極柱部４４は、蓋１４に所定の間隔をあけて並設された一対の挿通孔１４ｂからケース１２の外部に突出（露出）している。そして、正極端子４１及び負極端子４２の基部４３は、極柱部４４の両端部のうちケース本体１３内側に設けられている。また、正極端子４１及び負極端子４２の軸方向に直交し、かつ蓋側端面４３ａに沿った断面積は、挿通孔１４ｂの面積よりも大きく設定されている。このため、基部４３は、ケース本体１３の内側で挿通孔１４ｂから抜け出し不能になっている。 As shown in FIGS. 1 and 3, the pole column portion 44 inserted into the insertion portion 51 a of the lid-side insulating plate 51 is connected to the case 12 through a pair of insertion holes 14 b arranged in parallel with the lid 14 at a predetermined interval. Projecting (exposed) to the outside. The base portions 43 of the positive electrode terminal 41 and the negative electrode terminal 42 are provided inside the case main body 13 in both end portions of the pole column portion 44. Moreover, the cross-sectional area orthogonal to the axial direction of the positive electrode terminal 41 and the negative electrode terminal 42 and along the lid side end surface 43a is set larger than the area of the insertion hole 14b. For this reason, the base 43 cannot be removed from the insertion hole 14 b inside the case body 13.
蓋１４の挿通孔１４ｂの内周縁と、極柱部４４の外周面とは、絶縁リング１９によって絶縁されている。絶縁リング１９は、円環状のリング１９ａと、このリング１９ａの一端縁から外方へ延設されたフランジ部１９ｂと、から形成されている。リング１９ａは、挿通孔１４ｂの内周縁と、極柱部４４の外周面との間に介装されている。フランジ部１９ｂは、蓋１４の外面１４ｃにおいて挿通孔１４ｂの外側に係止されている。 The inner peripheral edge of the insertion hole 14 b of the lid 14 and the outer peripheral surface of the pole post 44 are insulated by the insulating ring 19. The insulating ring 19 is formed of an annular ring 19a and a flange portion 19b extending outward from one end edge of the ring 19a. The ring 19 a is interposed between the inner peripheral edge of the insertion hole 14 b and the outer peripheral surface of the pole column portion 44. The flange portion 19 b is locked to the outside of the insertion hole 14 b on the outer surface 14 c of the lid 14.
極柱部４４にはナット５５が螺合されている。ナット５５と蓋１４の外面１４ｃとの間には、絶縁リング１９のフランジ部１９ｂが介装され、フランジ部１９ｂによってナット５５と蓋１４が絶縁されている。ナット５５と基部４３によってフランジ部１９ｂ、蓋１４、及び蓋側絶縁板５１が挟持されると共に、極柱部４４が蓋１４に締結されている。この締結状態では、Ｏリング５６は、蓋１４の内面１４ａと、基部４３の蓋側端面４３ａとの間で圧縮され、蓋１４の内面１４ａ及び基部４３の蓋側端面４３ａに密接し、挿通孔１４ｂの周囲をシールしている。 A nut 55 is screwed into the pole post 44. A flange portion 19b of the insulating ring 19 is interposed between the nut 55 and the outer surface 14c of the lid 14, and the nut 55 and the lid 14 are insulated by the flange portion 19b. The flange portion 19 b, the lid 14, and the lid-side insulating plate 51 are sandwiched between the nut 55 and the base portion 43, and the pole column portion 44 is fastened to the lid 14. In this fastened state, the O-ring 56 is compressed between the inner surface 14a of the lid 14 and the lid-side end surface 43a of the base portion 43, and is in close contact with the inner surface 14a of the lid 14 and the lid-side end surface 43a of the base portion 43. The periphery of 14b is sealed.
次に、二次電池１０の作用を製造方法とともに説明する。
図６に示すように、正極導電部材３３及び負極導電部材３７において、各端子接続部３４に正極端子４１及び負極端子４２の基部４３を溶接し、正極導電部材３３と正極端子４１を一体化するとともに、負極導電部材３７と負極端子４２を一体化する。次に、正極導電部材３３のタブ溶接部３６を、電極組立体２０の正極タブ群４５に溶接し、負極導電部材３７のタブ溶接部３６を、電極組立体２０の負極タブ群４６に溶接する。
Next, the effect | action of the secondary battery 10 is demonstrated with a manufacturing method.
As shown in FIG. 6, in the positive electrode conductive member 33 and the negative electrode conductive member 37, the base portion 43 of the positive electrode terminal 41 and the negative electrode terminal 42 is welded to each terminal connection portion 34, and the positive electrode conductive member 33 and the positive electrode terminal 41 are integrated. At the same time, the negative electrode conductive member 37 and the negative electrode terminal 42 are integrated. Next, the tab weld portion 36 of the positive electrode conductive member 33 is welded to the positive electrode tab group 45 of the electrode assembly 20, and the tab weld portion 36 of the negative electrode conductive member 37 is welded to the negative electrode tab group 46 of the electrode assembly 20. .
正極端子４１及び負極端子４２に絶縁部材５０を装着する。絶縁部材５０の装着は、正極端子４１及び負極端子４２に対し、ケース本体１３の短側壁１３ｂ側から絶縁部材５０を正極端子４１及び負極端子４２に向けてスライド移動させる。すると、連通部５１ｂを極柱部４４が通過して、挿通部５１ａに極柱部４４が配置される。そして、基部４３の蓋側端面４３ａに蓋側絶縁板５１を支持させるとともに、組立体側絶縁板５３を基部４３の下側に配置する。さらに、絶縁部材５０を、ケース側絶縁板５２が対向する基部４３の一つの側面４３ｃの平面部Ｈに当接するまで正極端子４１及び負極端子４２に向けて押し込む。すると、係合突起５２ａが係合凹部４３ｆに係合するとともに、係合凹部４３ｆ以外でケース側絶縁板５２の内面と、基部４３の平面部Ｈとが面接触する。 The insulating member 50 is attached to the positive terminal 41 and the negative terminal 42. The insulating member 50 is attached by sliding the insulating member 50 toward the positive terminal 41 and the negative terminal 42 from the short side wall 13 b side of the case body 13 with respect to the positive terminal 41 and the negative terminal 42. Then, the pole column portion 44 passes through the communication portion 51b, and the pole column portion 44 is disposed in the insertion portion 51a. Then, the lid-side insulating plate 51 is supported on the lid-side end surface 43 a of the base portion 43, and the assembly-side insulating plate 53 is disposed below the base portion 43. Further, the insulating member 50 is pushed toward the positive electrode terminal 41 and the negative electrode terminal 42 until the insulating member 50 comes into contact with the flat surface portion H of one side surface 43c of the base portion 43 facing the case side insulating plate 52. Then, the engagement protrusion 52a engages with the engagement recess 43f, and the inner surface of the case-side insulating plate 52 and the flat surface portion H of the base 43 come into surface contact with each other except for the engagement recess 43f.
次に、正極端子４１の基部４３を治具６０によって位置決めする。ここで、治具６０について説明する。金属製の治具６０は、四角形状の底板６１と、底板６１の四つの側縁のうち対向する一対の側縁から立設された保持板６２と、一対の保持板６２に挟まれた一つの側縁から立設された支持板６３と、から形成されている。対向する一対の保持板６２間の間隙は、極柱部４４を挟んだ基部４３の一対の側面４３ｃにおける平面部Ｈ間の距離より若干長く設定されている。支持板６３は、両保持板６２から離れており、両保持板６２と支持板６３との間には、ケース側絶縁板５２が挿入可能な隙間Ｓが形成されている。 Next, the base 43 of the positive electrode terminal 41 is positioned by the jig 60. Here, the jig 60 will be described. The metal jig 60 includes a rectangular bottom plate 61, a holding plate 62 erected from a pair of opposing side edges of the four side edges of the bottom plate 61, and a pair of holding plates 62. And a support plate 63 erected from two side edges. The gap between the pair of opposing holding plates 62 is set to be slightly longer than the distance between the plane portions H of the pair of side surfaces 43c of the base portion 43 with the pole column portion 44 interposed therebetween. The support plate 63 is separated from both the holding plates 62, and a gap S in which the case-side insulating plate 52 can be inserted is formed between the both holding plates 62 and the support plate 63.
そして、図７（ａ）及び図７（ｂ）に示すように、治具６０の一対の保持板６２の間に、正極導電部材３３の端子接続部３４及び基部４３を収容すると、ケース側絶縁板５２が隙間Ｓに挿入される。また、一対の保持板６２の内面が、基部４３の一対の平面部Ｈの外側に配置されるとともに、支持板６３の内面が、ケース側絶縁板５２の外側に配置される。その結果、正極端子４１が三方から取り囲まれ、蓋側端面４３ａの面に沿う方向及び回転方向への移動が規制される。 7A and 7B, when the terminal connection portion 34 and the base portion 43 of the positive electrode conductive member 33 are accommodated between the pair of holding plates 62 of the jig 60, case-side insulation is achieved. The plate 52 is inserted into the gap S. In addition, the inner surfaces of the pair of holding plates 62 are disposed outside the pair of flat surface portions H of the base portion 43, and the inner surface of the support plate 63 is disposed outside the case-side insulating plate 52. As a result, the positive electrode terminal 41 is surrounded from three directions, and movement in the direction along the surface of the lid side end surface 43a and the rotation direction is restricted.
正極端子４１が治具６０によって位置決めされた状態で蓋側絶縁板５１上に蓋１４を載せるとともに、挿通孔１４ｂに極柱部４４を挿通させる。そして、極柱部４４の雄ねじ４４ａにナット５５を螺合する。この螺合作業の際、治具６０によって正極端子４１の移動が規制される。 With the positive electrode terminal 41 positioned by the jig 60, the lid 14 is placed on the lid-side insulating plate 51, and the pole column portion 44 is inserted into the insertion hole 14b. Then, a nut 55 is screwed into the male screw 44 a of the pole column 44. During the screwing operation, the movement of the positive electrode terminal 41 is regulated by the jig 60.
また、絶縁部材５０は、係合突起５２ａが基部４３における係合凹部４３ｆに係合している。このため、正極端子４１に対する絶縁部材５０の幅方向への移動が規制されるとともに、タブ溶接部３６に向けた絶縁部材５０の移動が規制される。さらに、係合突起５２ａは四角柱状であるため、係合突起５２ａを回動中心とした絶縁部材５０の回動もない。そして、絶縁部材５０が移動することが規制されるため、絶縁部材５０によって位置決めされたＯリング５６も移動することが規制される。なお、負極端子４２も上記と同様の方法によって蓋１４に締結され、正極端子４１と同様の作用効果が得られる。 Further, in the insulating member 50, the engagement protrusion 52 a is engaged with the engagement recess 43 f in the base portion 43. For this reason, the movement of the insulating member 50 in the width direction with respect to the positive electrode terminal 41 is restricted, and the movement of the insulating member 50 toward the tab weld portion 36 is restricted. Furthermore, since the engagement protrusion 52a has a quadrangular prism shape, the insulating member 50 does not rotate around the engagement protrusion 52a. Since the movement of the insulating member 50 is restricted, the movement of the O-ring 56 positioned by the insulating member 50 is also restricted. The negative electrode terminal 42 is also fastened to the lid 14 by the same method as described above, and the same effect as the positive electrode terminal 41 is obtained.
上記実施形態によれば、以下のような効果を得ることができる。
（１）正極端子４１及び負極端子４２の基部４３に係合凹部４３ｆを形成するとともに、絶縁部材５０のケース側絶縁板５２に、係合凹部４３ｆに係合する係合突起５２ａを形成した。このため、正極端子４１及び負極端子４２の雄ねじ４４ａにナット５５を螺合するとき、振動等が発生しても絶縁部材５０が、その幅方向及び基部４３の厚み方向へ位置ずれすることを防止することができる。このため、絶縁部材５０において、蓋側絶縁板５１を蓋１４と基部４３との間に介装した状態を維持して、蓋１４と正極端子４１及び負極端子４２との間の絶縁を維持することができる。
According to the above embodiment, the following effects can be obtained.
(1) The engaging recess 43f is formed in the base 43 of the positive electrode terminal 41 and the negative electrode terminal 42, and the engaging protrusion 52a that engages with the engaging recess 43f is formed in the case-side insulating plate 52 of the insulating member 50. For this reason, when the nut 55 is screwed into the male screw 44a of the positive electrode terminal 41 and the negative electrode terminal 42, the insulating member 50 is prevented from being displaced in the width direction and the thickness direction of the base portion 43 even if vibration or the like occurs. can do. For this reason, in the insulating member 50, the state in which the lid-side insulating plate 51 is interposed between the lid 14 and the base portion 43 is maintained, and the insulation between the lid 14, the positive terminal 41, and the negative terminal 42 is maintained. be able to.
（２）係合突起５２ａは、ケース側絶縁板５２に形成されている。ケース側絶縁板５２は、正極端子４１及び負極端子４２と、ケース本体１３を絶縁するために設けられている。よって、正極端子４１及び負極端子４２に対する絶縁部材５０の位置ずれを防止するための構成を、絶縁部材５０の一部に形成しており、ケース１２内の部品点数を増加させることなく、絶縁部材５０の位置ずれを防止することができる。 (2) The engagement protrusion 52 a is formed on the case-side insulating plate 52. The case-side insulating plate 52 is provided to insulate the positive terminal 41 and the negative terminal 42 from the case body 13. Therefore, the structure for preventing the displacement of the insulating member 50 with respect to the positive electrode terminal 41 and the negative electrode terminal 42 is formed in a part of the insulating member 50, and the insulating member is not increased without increasing the number of parts in the case 12. 50 positional shifts can be prevented.
（３）蓋側絶縁板５１には、極柱部４４が挿通される挿通部５１ａが形成されるとともに、挿通部５１ａを蓋側絶縁板５１の側方に開口させる切れ込み状の連通部５１ｂが形成され、蓋側絶縁板５１は平面視Ｕ字状に形成されている。また、係合突起５２ａは、ケース側絶縁板５２から挿通部５１ａ及び連通部５１ｂに向けて延びている。このため、絶縁部材５０を正極端子４１及び負極端子４２に向けてスライド移動させることで、極柱部４４を連通部５１ｂを介して挿通部５１ａに配置し、絶縁部材５０を正極端子４１及び負極端子４２の側方から装着することができる。これと同時に係合突起５２ａを係合凹部４３ｆに係合させることができ、正極端子４１及び負極端子４２に対する絶縁部材５０の装着及び位置ずれ防止を簡単に行うことができる。 (3) The lid-side insulating plate 51 has an insertion portion 51a through which the pole column portion 44 is inserted, and a notch-like communication portion 51b that opens the insertion portion 51a to the side of the lid-side insulating plate 51. The lid-side insulating plate 51 is formed in a U shape in plan view. Further, the engaging protrusion 52a extends from the case-side insulating plate 52 toward the insertion part 51a and the communication part 51b. Therefore, by sliding the insulating member 50 toward the positive electrode terminal 41 and the negative electrode terminal 42, the pole column portion 44 is disposed in the insertion portion 51a via the communication portion 51b, and the insulating member 50 is connected to the positive electrode terminal 41 and the negative electrode terminal 41a. The terminal 42 can be attached from the side. At the same time, the engagement protrusion 52a can be engaged with the engagement recess 43f, and the mounting of the insulating member 50 to the positive electrode terminal 41 and the negative electrode terminal 42 and prevention of displacement can be easily performed.
（４）係合凹部４３ｆが形成された側面４３ｃには平面部Ｈが形成されている。また、係合突起５２ａが形成されたケース側絶縁板５２も平坦面状に形成されている。このため、係合凹部４３ｆに係合突起５２ａを係合させた状態では、ケース側絶縁板５２と平面部Ｈが面接触する。このため、絶縁部材５０は、係合突起５２ａの係合凹部４３ｆへの係合に加え、ケース側絶縁板５２と平面部Ｈの面接触により、より安定した状態に位置決めすることができ、絶縁部材５０の位置ずれを防止することができる。 (4) A flat surface portion H is formed on the side surface 43c on which the engaging recess 43f is formed. Further, the case-side insulating plate 52 on which the engagement protrusions 52a are formed is also formed in a flat surface shape. For this reason, the case-side insulating plate 52 and the flat surface portion H are in surface contact in a state where the engagement protrusion 52a is engaged with the engagement recess 43f. For this reason, the insulating member 50 can be positioned in a more stable state by the surface contact between the case-side insulating plate 52 and the flat surface portion H in addition to the engagement of the engaging protrusion 52a with the engaging recess 43f. The displacement of the member 50 can be prevented.
（５）蓋側絶縁板５１の内側には、Ｏリング５６が位置決めされる。そして、係合突起５２ａの係合凹部４３ｆへの係合により、ナット５５を極柱部４４に螺合するとき絶縁部材５０の位置ずれを防止できるため、Ｏリング５６も位置ずれすることを防止できる。したがって、Ｏリング５６によって挿通孔１４ｂの周囲をシールした状態を維持することができる。 (5) The O-ring 56 is positioned inside the lid-side insulating plate 51. Since the engagement protrusion 52a is engaged with the engagement recess 43f, the displacement of the insulating member 50 can be prevented when the nut 55 is screwed into the pole post 44, so that the O-ring 56 is also prevented from being displaced. it can. Therefore, the state where the periphery of the insertion hole 14b is sealed by the O-ring 56 can be maintained.
（６）絶縁部材５０において、蓋側絶縁板５１の内側縁のうち挿通部５１ａより外側には連通部５１ｂを挟む位置に突部５１ｃが形成されている。このため、一対の突部５１ｃより連通部５１ｂの開口幅は狭められている。よって、蓋側絶縁板５１がＵ字状に形成されていても、突部５１ｃによってＯリング５６を挿通部５１ａ内に位置決めすることができ、Ｏリング５６を挿通孔１４ｂをシールする位置に位置決めすることができる。 (6) In the insulating member 50, a protrusion 51 c is formed on the inner edge of the lid-side insulating plate 51 outside the insertion portion 51 a at a position sandwiching the communication portion 51 b. For this reason, the opening width of the communication portion 51b is narrower than the pair of protrusions 51c. Therefore, even if the lid-side insulating plate 51 is formed in a U shape, the O-ring 56 can be positioned in the insertion portion 51a by the protrusion 51c, and the O-ring 56 is positioned at a position where the insertion hole 14b is sealed. can do.
（７）正極端子４１は、正極タブ群４５に溶接された正極導電部材３３に溶接され、負極導電部材３７は、負極タブ群４６に溶接された負極導電部材３７に溶接されている。このため、正極端子４１及び負極端子４２の基部４３を治具６０で保持して極柱部４４にナット５５を螺合するとき、正極端子４１及び負極端子４２の回動が防止されることから、正極導電部材３３及び負極導電部材３７が回動することも防止される。よって、正極導電部材３３及び負極導電部材３７が蓋１４の外形より飛び出すことが防止でき、電極組立体２０をケース本体１３に収容したとき、正極導電部材３３及び負極導電部材３７がケース本体１３に接触することを防止できる。 (7) The positive electrode terminal 41 is welded to the positive electrode conductive member 33 welded to the positive electrode tab group 45, and the negative electrode conductive member 37 is welded to the negative electrode conductive member 37 welded to the negative electrode tab group 46. For this reason, when the base part 43 of the positive electrode terminal 41 and the negative electrode terminal 42 is held by the jig 60 and the nut 55 is screwed into the polar column part 44, the positive electrode terminal 41 and the negative electrode terminal 42 are prevented from rotating. The positive electrode conductive member 33 and the negative electrode conductive member 37 are also prevented from rotating. Therefore, the positive electrode conductive member 33 and the negative electrode conductive member 37 can be prevented from jumping out of the outer shape of the lid 14, and when the electrode assembly 20 is accommodated in the case main body 13, the positive electrode conductive member 33 and the negative electrode conductive member 37 are attached to the case main body 13. Contact can be prevented.
（８）係合突起５２ａを四角柱状に形成し、係合凹部４３ｆを四角穴状に形成した。このため、係合突起５２ａが係合凹部４３ｆに係合した状態では、係合突起５２ａを回動中心とした絶縁部材５０の回動を防止することができる。 (8) The engagement protrusions 52a are formed in a square column shape, and the engagement recesses 43f are formed in a square hole shape. For this reason, in the state in which the engagement protrusion 52a is engaged with the engagement recess 43f, the insulating member 50 can be prevented from rotating about the engagement protrusion 52a.
なお、上記実施形態は以下のように変更してもよい。
○ 実施形態では、係合突起５２ａを四角柱状に形成し、係合凹部４３ｆを四角穴状に形成したが、係合突起５２ａ及び係合凹部４３ｆの形状は適宜変更してもよい。例えば、係合突起５２ａを三角柱状や五角柱状といった多角柱状や、三角錐状や四角錐状といった多角錐状であってもよく、係合突起５２ａの形状に合わせて係合凹部４３ｆの形状を変更する。
In addition, you may change the said embodiment as follows.
In the embodiment, the engagement protrusion 52a is formed in a quadrangular prism shape, and the engagement recess 43f is formed in a square hole shape. However, the shapes of the engagement protrusion 52a and the engagement recess 43f may be changed as appropriate. For example, the engagement protrusion 52a may be a polygonal prism shape such as a triangular prism shape or a pentagonal prism shape, or a polygonal pyramid shape such as a triangular pyramid shape or a quadrangular pyramid shape, and the shape of the engagement recess 43f may be matched to the shape of the engagement protrusion 52a. change.
○ 実施形態では、ケース側絶縁板５２に係合突起５２ａを一つだけ形成し、基部４３に係合凹部４３ｆを一つだけ形成したが、係合突起５２ａ及び係合凹部４３ｆを複数形成してもよい。この場合は、係合突起５２ａを円柱状や円錐状に形成し、係合凹部４３ｆを丸穴状に形成してもよい。 In the embodiment, only one engagement protrusion 52a is formed on the case-side insulating plate 52 and only one engagement recess 43f is formed on the base 43. However, a plurality of engagement protrusions 52a and engagement recesses 43f are formed. May be. In this case, the engagement protrusion 52a may be formed in a columnar shape or a conical shape, and the engagement recess 43f may be formed in a round hole shape.
○ 実施形態では、基部４３を平面視四角形状として側面４３ｃに平面部Ｈを形成したが、それには限定されず、基部４３を円柱状に形成してもよい。
○ 実施形態では、ケース側絶縁板５２に係合凸部としての係合突起５２ａを形成したが、組立体側絶縁板５３において、基部４３側の面に係合凸部としての係合突起を突設し、基部４３における溶接側端面４３ｂに係合凹部を形成してもよい。
In the embodiment, the base 43 has a quadrangular shape in plan view, and the flat surface H is formed on the side surface 43c. However, the present invention is not limited to this, and the base 43 may be formed in a cylindrical shape.
In the embodiment, the case-side insulating plate 52 is formed with the engaging protrusion 52a as the engaging protrusion, but the assembly-side insulating plate 53 protrudes with the engaging protrusion as the engaging protrusion on the surface on the base 43 side. And an engagement recess may be formed on the welding side end face 43 b of the base 43.
○ 実施形態では、基部４３の側面４３ｃに係合凹部４３ｆを形成したが、蓋側端面４３ａに係合凹部４３ｆを形成してもよい。この場合、ケース側絶縁板５２の係合突起５２ａが、側面４３ｃの係合凹部４３ｆに係合し、蓋側絶縁板５１の内面にも係合凸部が形成される。 In the embodiment, the engaging recess 43f is formed on the side surface 43c of the base 43, but the engaging recess 43f may be formed on the lid-side end surface 43a. In this case, the engagement protrusion 52 a of the case side insulating plate 52 engages with the engagement concave portion 43 f of the side surface 43 c, and the engagement convex portion is also formed on the inner surface of the lid side insulating plate 51.
○ 実施形態では、基部４３の側面４３ｃに係合凹部４３ｆを形成したが、側面４３ｃには係合凹部４３ｆを形成せず、蓋側端面４３ａに係合凹部４３ｆを形成してもよい。この場合、ケース側絶縁板５２の係合突起５２ａは無くなり、蓋側絶縁板５１の内面に係合凸部が形成される。 In the embodiment, the engaging recess 43f is formed on the side surface 43c of the base 43. However, the engaging recess 43f may be formed on the lid side end surface 43a without forming the engaging recess 43f on the side surface 43c. In this case, the engagement protrusion 52 a of the case side insulating plate 52 is eliminated, and an engagement convex portion is formed on the inner surface of the lid side insulating plate 51.
○ 実施形態では、正極端子４１及び負極端子４２の基部４３に係合凹部４３ｆを形成し、絶縁部材５０に係合突起５２ａを形成したが、これに限らない。正極端子４１及び負極端子４２に係合凹部４３ｆに加え係合凸部を形成し、絶縁部材５０に係合突起５２ａに加え係合凹部を形成してもよい。 In the embodiment, the engagement recess 43f is formed in the base 43 of the positive electrode terminal 41 and the negative electrode terminal 42, and the engagement protrusion 52a is formed in the insulating member 50. However, the present invention is not limited to this. The positive electrode terminal 41 and the negative electrode terminal 42 may be formed with an engaging convex portion in addition to the engaging concave portion 43f, and the insulating member 50 may be formed with an engaging concave portion in addition to the engaging protrusion 52a.
○ 実施形態では、正極端子４１及び負極端子４２の基部４３に係合凹部４３ｆを形成し、絶縁部材５０に係合突起５２ａを形成したが、これに限らない。正極端子４１及び負極端子４２に係合凸部を形成し、絶縁部材５０に係合凸部に係合する係合凹部を形成してもよい。 In the embodiment, the engagement recess 43f is formed in the base 43 of the positive electrode terminal 41 and the negative electrode terminal 42, and the engagement protrusion 52a is formed in the insulating member 50. However, the present invention is not limited to this. Engaging convex portions may be formed on the positive electrode terminal 41 and the negative electrode terminal 42, and engaging concave portions engaging with the engaging convex portions may be formed on the insulating member 50.
○ 実施形態では、極柱部４４にナット５５を螺合する際、治具６０を用いて基部４３を保持したが、治具６０は用いずに、例えば、ペンチ、スパナ等で基部４３を保持してもよい。 In the embodiment, when the nut 55 is screwed onto the pole post 44, the base 43 is held using the jig 60. However, the base 43 is held using, for example, a pliers or a spanner without using the jig 60. May be.
○ 実施形態では、絶縁部材５０に組立体側絶縁板５３を設けたが、基部４３と電極組立体２０との間に絶縁距離を確保できるのであれば、組立体側絶縁板５３は無くてもよい。 In the embodiment, the assembly-side insulating plate 53 is provided on the insulating member 50, but the assembly-side insulating plate 53 may be omitted as long as an insulation distance can be secured between the base portion 43 and the electrode assembly 20.
○ 実施形態では、絶縁部材５０にケース側絶縁板５２を設けたが、基部４３とケース本体１３との間に絶縁距離を確保できるのであれば、ケース側絶縁板５２は無くてもよい。この場合、蓋側絶縁板５１において、基部４３の蓋側端面４３ａに対向する面に係合凸部を形成し、基部４３の蓋側端面４３ａに係合凹部を形成してもよいし、その逆に、蓋側絶縁板５１に係合凹部としての係合孔を形成し、基部４３の蓋側端面４３ａに係合凸部を形成してもよい。 In the embodiment, the case-side insulating plate 52 is provided on the insulating member 50, but the case-side insulating plate 52 may be omitted as long as an insulation distance can be secured between the base portion 43 and the case main body 13. In this case, in the lid-side insulating plate 51, an engagement convex portion may be formed on a surface of the base portion 43 that faces the lid-side end surface 43a, and an engagement concave portion may be formed on the lid-side end surface 43a of the base portion 43. Conversely, an engagement hole as an engagement recess may be formed in the lid-side insulating plate 51, and an engagement protrusion may be formed in the lid-side end surface 43 a of the base 43.
○ 電極組立体２０を構成する正極電極２１、及び負極電極２２の枚数は適宜変更してもよい。
○ ケース１２の形状は、円柱状や、左右方向に扁平な楕円柱状に形成してもよい。
The number of the positive electrode 21 and the negative electrode 22 which comprise the electrode assembly 20 may be changed suitably.
The shape of the case 12 may be formed in a columnar shape or an elliptical column shape that is flat in the left-right direction.
○ 本発明は、蓄電装置としてのニッケル水素二次電池や、電気二重層キャパシタとして具体化してもよい。 The present invention may be embodied as a nickel hydride secondary battery as an electricity storage device or an electric double layer capacitor.
Ｈ…平面部、１０…蓄電装置としての二次電池、１３…ケース本体、１３ｄ…開口部、１４…蓋、１４ａ…内面、１４ｂ…挿通孔、２０…電極組立体、４１…電極端子としての正極端子、４２…電極端子としての負極端子、４３…基部、４３ａ…端面としての蓋側端面、４３ｃ…側面、４３ｆ…係合凹部、４４…極柱部、５０…絶縁部材、５１…蓋側絶縁板、５１ａ…挿通部、５１ｂ…連通部、５２…ケース側絶縁板、５２ａ…係合凸部としての係合突起、５３…組立体側絶縁板、５５…ナット。 H: Planar part, 10 ... Secondary battery as power storage device, 13 ... Case main body, 13d ... Opening, 14 ... Lid, 14a ... Inner surface, 14b ... Insertion hole, 20 ... Electrode assembly, 41 ... As electrode terminal Positive terminal, 42 ... Negative electrode terminal as electrode terminal, 43 ... Base, 43a ... End surface on the lid side, 43c ... Side surface, 43f ... Engaging recess, 44 ... Polar pole part, 50 ... Insulating member, 51 ... Cover side Insulating plate, 51a ... insertion part, 51b ... communication part, 52 ... case side insulating plate, 52a ... engagement protrusion as an engaging convex part, 53 ... assembly side insulating plate, 55 ... nut.
Claims (7)
前記開口部を閉塞する蓋と、
前記ケース本体内に収容された電極組立体と、
前記蓋に形成された挿通孔を通って前記蓋から突出した極柱部と、前記極柱部の両端部のうち前記ケース本体内側の端部に設けられ、前記挿通孔の面積よりも大きい断面積を有する基部とを有し、前記電極組立体と電気的に接続された電極端子と、
前記極柱部に螺合されて前記電極端子の前記基部と共に前記蓋を挟持するナットと、
前記蓋の内面と、該内面に対向する前記電極端子の前記基部との間を絶縁する絶縁部材と、を有する蓄電装置であって、
前記基部において、前記蓋の内面と対向する面を端面とするとともに、該端面に交わる面であり、かつ前記基部の外形を形成する面を前記基部の側面とすると、
前記絶縁部材は、前記蓋の内面と、前記基部の端面との間に配置される蓋側絶縁板を有し、該蓋側絶縁板には、前記極柱部が挿通される挿通部が形成されており、
前記基部には、係合凹部及び係合凸部の少なくとも一方が形成され、前記絶縁部材には、前記基部の前記係合凹部と係合する係合凸部及び前記基部の前記係合凸部と係合する係合凹部の少なくとも一方が形成されていることを特徴とする蓄電装置。 A case body having an opening;
A lid that closes the opening;
An electrode assembly housed in the case body;
A pole post projecting from the lid through an insertion hole formed in the lid, and provided at an end of the case main body among both ends of the pole post, and having a larger area than the area of the insertion hole. An electrode terminal having a base portion having an area and electrically connected to the electrode assembly;
A nut that is screwed into the pole post and clamps the lid together with the base of the electrode terminal;
An electrical storage device having an inner surface of the lid and an insulating member that insulates between the base portion of the electrode terminal facing the inner surface,
In the base, when the surface facing the inner surface of the lid is an end surface, the surface intersecting the end surface, and the surface forming the outer shape of the base is the side surface of the base,
The insulating member has a lid-side insulating plate disposed between the inner surface of the lid and the end surface of the base, and the lid-side insulating plate has an insertion portion through which the pole column portion is inserted. Has been
The base has at least one of an engagement recess and an engagement protrusion, and the insulating member has an engagement protrusion that engages with the engagement recess of the base and the engagement protrusion of the base. An electrical storage device, wherein at least one of engagement recesses that engage with the battery is formed.
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