JP2015153741A - Electricity storage device - Google Patents
Electricity storage device Download PDFInfo
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- JP2015153741A JP2015153741A JP2014029887A JP2014029887A JP2015153741A JP 2015153741 A JP2015153741 A JP 2015153741A JP 2014029887 A JP2014029887 A JP 2014029887A JP 2014029887 A JP2014029887 A JP 2014029887A JP 2015153741 A JP2015153741 A JP 2015153741A
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- 238000003860 storage Methods 0.000 title claims abstract description 24
- 230000005611 electricity Effects 0.000 title abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims description 28
- 238000003780 insertion Methods 0.000 claims description 20
- 230000037431 insertion Effects 0.000 claims description 20
- 238000003466 welding Methods 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000007789 sealing Methods 0.000 description 8
- 239000000615 nonconductor Substances 0.000 description 5
- 230000002265 prevention Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 210000000078 claw Anatomy 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229910000652 nickel hydride Inorganic materials 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Electric Double-Layer Capacitors Or The Like (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
本発明は、極柱部及び基部を有する電極端子と、極柱部の外周面の雄ねじ部に螺合されたナットと、壁部と基部とを絶縁する端子カバーと、を有する蓄電装置に関する。 The present invention relates to a power storage device that includes an electrode terminal having a pole portion and a base portion, a nut screwed into a male screw portion on an outer peripheral surface of the pole post portion, and a terminal cover that insulates the wall portion and the base portion.
二次電池やキャパシタのような蓄電装置は再充電が可能であり、繰り返し使用することができるため電源として広く利用されている。一般に、容量の大きな二次電池(蓄電装置)はケースを備え、そのケース内に電極組立体及び電解液が収容されているとともに、電極組立体から電気を取り出すための電極端子が、導電部材を介して電極組立体に接続されている。また、電極端子は、ケースの蓋を貫通して、ケース外に突出する極柱部を有し、この極柱部は外周面に雄ねじ部を備える構造が知られている。そして、前記構造にて、電極組立体に接続された電極端子は、雄ねじ部にナットを螺合することで蓋に固定される。 Power storage devices such as secondary batteries and capacitors are widely used as power sources because they can be recharged and can be used repeatedly. In general, a secondary battery (power storage device) having a large capacity includes a case in which an electrode assembly and an electrolytic solution are accommodated, and an electrode terminal for taking out electricity from the electrode assembly includes a conductive member. To the electrode assembly. Moreover, the electrode terminal has a pole column part which penetrates the lid of the case and protrudes outside the case, and this pole column part has a structure including an external thread part on the outer peripheral surface. In the above structure, the electrode terminal connected to the electrode assembly is fixed to the lid by screwing a nut into the male screw portion.
ところで、電極端子にナットを螺合する際、ナットと共に電極端子が連れ回りすると、電極端子に一体の導電部材がケースに接触して短絡の原因になる虞がある。そこで、ナットを螺合する際の電極端子の連れ回りを抑制する構造が提案されている(例えば、特許文献1参照)。 By the way, when the nut is screwed together with the electrode terminal, if the electrode terminal is rotated together with the nut, the conductive member integral with the electrode terminal may come into contact with the case and cause a short circuit. In view of this, a structure has been proposed that suppresses the accompanying rotation of the electrode terminals when the nuts are screwed together (see, for example, Patent Document 1).
図10に示すように、特許文献1の電気二重層キャパシタでは、金属ケース80の封口蓋体81に固定された電極端子82を有し、この電極端子82は、ねじ端子80aを備えるとともに、このねじ端子80aの軸方向の一端に係止板83を備える。電極端子82は、ワッシャ84を介してナット85により封口蓋体81に締結されている。 As shown in FIG. 10, the electric double layer capacitor disclosed in Patent Document 1 has an electrode terminal 82 fixed to a sealing lid 81 of a metal case 80. The electrode terminal 82 includes a screw terminal 80a. A locking plate 83 is provided at one axial end of the screw terminal 80a. The electrode terminal 82 is fastened to the sealing lid 81 by a nut 85 via a washer 84.
また、封口蓋体81の内側には、ねじ端子80a、ワッシャ84、及び係止板83を、封口蓋体81と絶縁する樹脂製の電気絶縁体86が設けられている。この電気絶縁体86は、係止板83と係合する係合面86aを有する。そして、係止板83は、電気絶縁体86と一体化されているため、ナット85をねじ端子80aに螺合させたとき、ねじ端子80aが連れ回りしようとしても、係止板83が電気絶縁体86の係合面86aに係合し、ねじ端子80aの連れ回りが抑制される。 In addition, a resin electrical insulator 86 that insulates the screw terminal 80 a, the washer 84, and the locking plate 83 from the sealing lid 81 is provided inside the sealing lid 81. The electrical insulator 86 has an engagement surface 86 a that engages with the locking plate 83. Since the locking plate 83 is integrated with the electrical insulator 86, when the nut 85 is screwed into the screw terminal 80a, the locking plate 83 is electrically insulated even if the screw terminal 80a tries to rotate. Engaging with the engaging surface 86a of the body 86, the rotation of the screw terminal 80a is suppressed.
ところで、電極端子82が封口蓋体81に対しがたつくと、封口蓋体81における電極端子82の挿通部のシール性が低下する。このため、電極端子82は、封口蓋体81に対し移動しないように締結されている必要があり、適切な締め付けトルクでナット85を螺合して適切な軸力で電極端子82を封口蓋体81に締結することが必要である。しかし、樹脂製の電気絶縁体86では、適切な締め付けトルクに耐え難く、ねじ端子80aの連れ回りを抑制できないことがある。 By the way, if the electrode terminal 82 rattles with respect to the sealing lid body 81, the sealing performance of the insertion part of the electrode terminal 82 in the sealing lid body 81 will fall. Therefore, the electrode terminal 82 needs to be fastened so as not to move with respect to the sealing lid 81, and the nut 85 is screwed with an appropriate tightening torque, and the electrode terminal 82 is sealed with an appropriate axial force. It is necessary to fasten to 81. However, the resin electrical insulator 86 is difficult to withstand an appropriate tightening torque, and the rotation of the screw terminal 80a may not be suppressed.
また、二次電池同士は、異なる極の電極端子同士を板状の導通部材で接続して電気的に接続される。この導通部材をねじ端子80aに接続する際にも、ねじ端子80aの内周面に形成された雌ねじ部にボルトが螺合される。このときも、ナット85やボルトは、適切な締め付けトルクで螺合されるが、樹脂製の電気絶縁体86では、適切な締め付けトルクに耐え難く、ねじ端子80aの連れ回りを抑制できないことがある。 Further, the secondary batteries are electrically connected by connecting electrode terminals of different poles with a plate-like conductive member. Also when the conductive member is connected to the screw terminal 80a, a bolt is screwed into the female screw portion formed on the inner peripheral surface of the screw terminal 80a. At this time, the nut 85 and the bolt are screwed together with an appropriate tightening torque. However, the resin-made electrical insulator 86 is difficult to withstand the appropriate tightening torque, and the rotation of the screw terminal 80a may not be suppressed. .
本発明は、電極端子の連れ回りを抑制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 suppress the accompanying rotation of electrode terminals.
上記問題点を解決するための蓄電装置は、ケース内の電極組立体と、前記電極組立体と接続された導電部材と、前記導電部材と接続され、前記ケースの壁部の挿通孔よりケース外へ突出する極柱部、及びケースの内側に位置し、かつ前記極柱部の端部と一体の基部を有する電極端子と、前記極柱部の外周面の雄ねじ部に螺合されたナットと、前記壁部と前記基部とを絶縁する端子カバーと、を有する蓄電装置であって、前記蓄電装置同士の接続のため、前記極柱部に導通部材を接続する際には、前記極柱部が備える雌ねじ部に接続部材が螺合されるとともに、前記ナットを前記雄ねじ部に螺合する際には前記電極端子を回り止めする治具が用いられ、前記電極端子は、前記治具が係合する治具用係合部を有し、前記端子カバーは、前記基部に係合する第1係合部及び前記壁部に係合する第2係合部を有し、前記壁部は、前記第2係合部が係合する壁部用係合部を有することを要旨とする。 A power storage device for solving the above problems includes an electrode assembly in a case, a conductive member connected to the electrode assembly, and connected to the conductive member. An electrode terminal having a base portion integral with an end portion of the pole column portion, and a nut screwed into a male screw portion of the outer peripheral surface of the pole column portion; A power storage device having a terminal cover that insulates the wall portion and the base portion, and when connecting a conductive member to the pole column portion for connecting the power storage devices, the pole column portion A connecting member is screwed into the female screw portion included in the jig, and a jig that prevents the electrode terminal from rotating when the nut is screwed into the male screw portion is used. The electrode terminal is engaged with the jig. Engaging terminal for jig to be joined, and the terminal cover is attached to the base A first engaging portion to be engaged and a second engaging portion to be engaged with the wall portion, and the wall portion has an engaging portion for a wall portion with which the second engaging portion is engaged. And
これによれば、ナットを電極端子の雄ねじ部に螺合する際、治具用係合部に治具を係合させ、治具を回り止めした状態でナットを雄ねじ部に螺合すると、ナットの回転に電極端子が連れ回りしようとするが、回り止めされた治具に治具用係合部が係合し、電極端子の連れ回りが抑制される。 According to this, when the nut is screwed into the male screw portion of the electrode terminal, the jig is engaged with the jig engaging portion, and the nut is screwed into the male screw portion while the jig is prevented from rotating. The electrode terminal tries to rotate with the rotation, but the jig engaging portion engages with the jig that is prevented from rotating, and the rotation of the electrode terminal is suppressed.
また、接続部材を電極端子の雌ねじ部に螺合する際、壁部用係合部に端子カバーの第2係合部が係合する。端子カバーは、第1係合部が電極端子の基部に係合して回り止めされている。このため、接続部材の回転に電極端子が連れ回りしようとするが、端子カバーが蓋に係合して回り止めされるため、その端子カバーが回り止めされた電極端子も連れ回りが抑制される。 Further, when the connecting member is screwed into the female screw portion of the electrode terminal, the second engaging portion of the terminal cover is engaged with the engaging portion for the wall portion. The terminal cover is prevented from rotating by the first engagement portion engaging the base portion of the electrode terminal. For this reason, the electrode terminal tries to rotate with the rotation of the connection member, but the terminal cover is engaged with the lid and is prevented from rotating, so that the electrode terminal with the terminal cover being prevented from rotating is also suppressed. .
また、蓄電装置について、前記壁部用係合部及び前記第2係合部は傾斜面を有し、前記壁部用係合部の傾斜面は、前記治具と治具用係合部との間のクリアランスの範囲内で前記電極端子が回転しても壁部用係合部と第2係合部とが傾斜面同士で当接した状態を維持できる範囲に形成されていてもよい。 In the power storage device, the wall engaging portion and the second engaging portion have inclined surfaces, and the inclined surface of the wall engaging portion includes the jig and the jig engaging portion. Even if the electrode terminal rotates within a clearance range between the wall, the wall engaging portion and the second engaging portion may be formed in a range where the inclined surfaces can be maintained in contact with each other.
これによれば、例えば、端子カバーの第2係合部に、壁部の壁部用係合部が乗り上げてしまった状態でナットを雄ねじ部に螺合する際、クリアランスの範囲内では電極端子が回転する。しかし、電極端子が回転しても、壁部用係合部と第2係合部とが傾斜面同士で当接しているため、ナットの螺合によって壁部が押圧されると、壁部用係合部と第2係合部とが係合するように壁部を移動させることができる。 According to this, for example, when the nut is screwed into the male threaded portion with the wall engaging portion of the wall portion riding on the second engaging portion of the terminal cover, the electrode terminal is within the clearance range. Rotates. However, even if the electrode terminal rotates, the wall engaging portion and the second engaging portion are in contact with each other at the inclined surfaces. The wall portion can be moved so that the engaging portion and the second engaging portion are engaged.
また、蓄電装置について、前記治具は棒状の断面六角形状であり、前記治具用係合部は平面視六角形状であるのが好ましい。
これによれば、治具用係合部には係合面が複数設けられ、治具にも係合面が複数設けられる。このため、係合面同士の係合箇所が複数形成され、ナットの回転方向への力が係合箇所に作用しても、各係合箇所に発生する応力が分散され、電極端子の連れ回りを抑制できる。
In the power storage device, it is preferable that the jig has a bar-shaped hexagonal cross section, and the jig engaging portion has a hexagonal shape in plan view.
According to this, a plurality of engagement surfaces are provided in the jig engaging portion, and a plurality of engagement surfaces are also provided in the jig. For this reason, a plurality of engagement points between the engagement surfaces are formed, and even if the force in the rotation direction of the nut acts on the engagement points, the stress generated at each engagement point is dispersed and the electrode terminals are rotated. Can be suppressed.
また、蓄電装置について、前記壁部及び前記端子カバーは前記基部と前記ナットの間に挟持され、前記壁部用係合部における前記壁部の厚み方向に沿う長さは、前記厚み方向に沿った前記壁部の外面から前記極柱部の先端までの長さの公差より長く設定されていてもよい。 In the power storage device, the wall portion and the terminal cover are sandwiched between the base portion and the nut, and a length along the thickness direction of the wall portion in the wall engaging portion is along the thickness direction. Further, it may be set longer than the tolerance of the length from the outer surface of the wall portion to the tip of the polar column portion.
これによれば、第2係合部に壁部の内面が乗り上げてしまったとき、壁部の外面は極柱部の先端面に近付く。このため、壁部の外面と、極柱部の先端面との長さを測定すると、この長さが公差で生じる差異には収まらず、壁部が第2係合部に乗り上げたことを検出できる。 According to this, when the inner surface of the wall portion rides on the second engaging portion, the outer surface of the wall portion approaches the tip surface of the polar column portion. For this reason, when measuring the length of the outer surface of the wall portion and the tip end surface of the pole column portion, this length does not fall within the difference caused by the tolerance, and it is detected that the wall portion has run on the second engaging portion. it can.
また、蓄電装置について、負極の電極端子の基部には電流遮断装置が一体化されている。
これによれば、電流遮断装置を機能させるために、例えば、電極端子に接合された導電部材には破断溝が設けられる。電極端子の連れ回りを抑制することにより、電極端子に接合された導電部材に応力が生じず、破断溝が破断してしまうことを抑制できる。
In the power storage device, a current interrupt device is integrated with the base of the negative electrode terminal.
According to this, in order to make the current interrupting device function, for example, the breaking member is provided in the conductive member joined to the electrode terminal. By suppressing the accompanying rotation of the electrode terminal, it is possible to suppress the breakage of the fracture groove without causing stress in the conductive member joined to the electrode terminal.
本発明によれば、電極端子の連れ回りを抑制することができる。 According to the present invention, the accompanying rotation of the electrode terminals can be suppressed.
以下、蓄電装置を二次電池に具体化した一実施形態を図1〜図9にしたがって説明する。
図1に示すように、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及び電解液(図示せず)が収容されている。また、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とを備える。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。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り、リチウムイオン電池である。蓋14は、長手方向の両側部に円形状の挿通孔14bを備える。また、蓋14において、ケース本体13の内側に臨む面を内面14aとし、ケース12の外側に露出する面を外面14cとする。
Hereinafter, an embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS.
As shown in FIG. 1, in the secondary battery 10, an electrode assembly 20 and an electrolytic solution (not shown) are accommodated in a metal case 12. In addition, 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. Further, the secondary battery 10 of the present embodiment is a square battery whose outer periphery forms a square shape, and is a lithium ion battery. The lid 14 includes circular insertion holes 14b on both sides in the longitudinal direction. Moreover, in the lid | cover 14, the surface which faces the inner side of the case main body 13 is made into the inner surface 14a, and the surface exposed to the outer side of the case 12 is made into the outer surface 14c.
図2に示すように、壁部としての蓋14は、挿通孔14bを囲む略円状の凹部15を備え、凹部15は蓋14の内面14aから凹んでいる。凹部15の外縁部のうち、蓋14の長手方向へ直線状に延びる一対の外縁部は壁部用係合部15aである。各壁部用係合部15aは、凹部15から蓋14の各長辺に向かう程、凹部15の開口幅を拡大させる傾斜面である。 As shown in FIG. 2, the lid 14 as a wall portion includes a substantially circular recess 15 surrounding the insertion hole 14 b, and the recess 15 is recessed from the inner surface 14 a of the lid 14. Of the outer edge portions of the recess 15, a pair of outer edge portions extending linearly in the longitudinal direction of the lid 14 are wall engaging portions 15 a. Each of the wall engaging portions 15 a is an inclined surface that increases the opening width of the recess 15 as it goes from the recess 15 toward each long side of the lid 14.
図1に示すように、電極組立体20は、正極電極21、負極電極22、及び正極電極21と負極電極22とを絶縁するセパレータを有する。正極電極21は、正極金属箔(アルミニウム箔)の両面に正極活物質を備える。負極電極22は、負極金属箔(銅箔)の両面に負極活物質を備える。そして、電極組立体20は、複数の正極電極21と複数の負極電極22が交互に積層されるとともに、両電極の間にセパレータが介在された積層構造である。 As shown in FIG. 1, the electrode assembly 20 includes a positive electrode 21, a negative electrode 22, and a separator that insulates the positive electrode 21 from the negative electrode 22. The positive electrode 21 includes a positive electrode active material on both surfaces of a positive metal foil (aluminum foil). The negative electrode 22 includes a negative electrode active material on both surfaces of a negative electrode metal foil (copper foil). The electrode assembly 20 has a laminated structure in which a plurality of positive electrodes 21 and a plurality of negative electrodes 22 are alternately laminated, and a separator is interposed between the two electrodes.
正極電極21は、一辺(長辺)の一部に正極集電タブ31を有し、負極電極22は、一辺(長辺)の一部に負極集電タブ32を有する。複数の正極電極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、複数の負極電極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。 The positive electrode 21 has a positive current collecting tab 31 on a part of one side (long side), and the negative electrode 22 has a negative current collecting tab 32 on a part of one side (long side). The plurality of positive electrodes 21 are stacked such that the respective positive electrode current collecting tabs 31 are arranged in a line along the stacking direction. Similarly, the plurality of negative electrode electrodes 22 are stacked such that the respective negative electrode current collecting tabs 32 are arranged in a row along the stacking direction so as not to overlap the positive electrode current collecting tabs 31.
電極組立体20は、正極集電タブ31を集めてなる正極タブ群45を備える。この正極タブ群45が、導電部材としての正極導電部材33と溶接され、電極組立体20と正極導電部材33が接続されている。また、正極導電部材33には、電極端子としての正極端子41が接合されている。 The electrode assembly 20 includes a positive electrode tab group 45 formed by collecting positive electrode current collecting tabs 31. The positive electrode tab group 45 is welded to a positive electrode conductive member 33 as a conductive member, and the electrode assembly 20 and the positive electrode conductive member 33 are connected. A positive electrode terminal 41 as an electrode terminal is joined to the positive electrode conductive member 33.
また、電極組立体20は、負極集電タブ32を集めてなる負極タブ群46を備える。この負極タブ群46が、導電部材としての負極導電部材37と溶接され、電極組立体20と負極導電部材37が接続されている。また、負極導電部材37には、電極端子としての負極端子42が接合されている。 The electrode assembly 20 includes a negative electrode tab group 46 formed by collecting the negative electrode current collecting tabs 32. The negative electrode tab group 46 is welded to a negative electrode conductive member 37 as a conductive member, and the electrode assembly 20 and the negative electrode conductive member 37 are connected. Further, a negative electrode terminal 42 as an electrode terminal is joined to the negative electrode conductive member 37.
図2、図3、及び図5(a)に示すように、正極導電部材33は、矩形板を屈曲させて形成されている。正極導電部材33は、屈曲部よりも長手方向の一方側に矩形状のタブ溶接片33aを備えるとともに、屈曲部よりも長手方向の他方側に矩形状の端子溶接片33bを備える。端子溶接片33bには、円形状の溶接用孔33cが形成されている。正極導電部材33の端子溶接片33bには正極端子41が溶接されている。 As shown in FIGS. 2, 3 and 5A, the positive electrode conductive member 33 is formed by bending a rectangular plate. The positive electrode conductive member 33 includes a rectangular tab weld piece 33a on one side in the longitudinal direction from the bent portion, and a rectangular terminal weld piece 33b on the other side in the longitudinal direction from the bent portion. A circular welding hole 33c is formed in the terminal welding piece 33b. The positive electrode terminal 41 is welded to the terminal weld piece 33 b of the positive electrode conductive member 33.
正極端子41は、基部として板状の正極基部43を有する。また、正極端子41は、正極基部43の中央から立設された極柱部としての円筒状の正極柱部44を有するとともに、この正極柱部44の外周面に雄ねじ部44aを有する。正極基部43はケース12の内側に位置し、かつ正極柱部44の軸方向の一端部と一体である。正極基部43は、正極柱部44を取り囲み、かつ蓋14の内面14aに対向するシール座面43aと、シール座面43aを取り囲み、かつシール座面43aより低い位置に座面43bを有する。また、正極基部43は、厚み方向においてシール座面43aと反対側の面に円筒状の溶接片43cを有する。そして、正極導電部材33の溶接用孔33cに溶接片43cが挿入された状態で溶接片43cの先端が端子溶接片33bにおける溶接用孔33cの周囲に溶接され、正極端子41と正極導電部材33が接合されている。 The positive electrode terminal 41 has a plate-like positive electrode base portion 43 as a base portion. The positive electrode terminal 41 has a cylindrical positive electrode column portion 44 as a pole column portion erected from the center of the positive electrode base portion 43, and a male screw portion 44 a on the outer peripheral surface of the positive electrode column portion 44. The positive electrode base portion 43 is located inside the case 12 and is integral with one end portion of the positive electrode column portion 44 in the axial direction. The positive electrode base portion 43 surrounds the positive electrode column portion 44 and has a seal seat surface 43a facing the inner surface 14a of the lid 14, and surrounds the seal seat surface 43a and has a seat surface 43b at a position lower than the seal seat surface 43a. Moreover, the positive electrode base 43 has a cylindrical weld piece 43c on the surface opposite to the seal seat surface 43a in the thickness direction. The tip of the weld piece 43c is welded around the weld hole 33c in the terminal weld piece 33b in a state where the weld piece 43c is inserted into the weld hole 33c of the positive electrode conductive member 33, and the positive terminal 41 and the positive electrode conductive member 33 are welded. Are joined.
正極基部43は、その外周面に係止面43dを四箇所有し、四つの係止面43dは正極基部43の周方向に等間隔おきに設けられている。各係止面43dは平坦面状である。正極基部43には、樹脂製及び円筒状の正極端子カバー50が装着されている。正極端子カバー50は、正極基部43の外周面のうち、座面43b寄りを覆う円筒状の絶縁筒部51と、絶縁筒部51の軸方向一端に設けられた円環状の蓋側絶縁部52とを有する。 The positive electrode base 43 has four locking surfaces 43 d on the outer peripheral surface thereof, and the four locking surfaces 43 d are provided at equal intervals in the circumferential direction of the positive electrode base 43. Each locking surface 43d is a flat surface. A resin-made and cylindrical positive electrode terminal cover 50 is attached to the positive electrode base portion 43. The positive electrode terminal cover 50 includes a cylindrical insulating cylinder portion 51 that covers the outer peripheral surface of the positive electrode base portion 43 and closes to the seat surface 43 b, and an annular lid-side insulating portion 52 provided at one axial end of the insulating cylinder portion 51. And have.
図2に示すように、絶縁筒部51は、その内周面に第1係合部51bを四箇所に有する。第1係合部51bは、絶縁筒部51の周方向へ等間隔おきに設けられ、平坦面状である。各第1係合部51bは正極基部43の係止面43dに係合し、正極端子カバー50の周方向に沿った回り止めをする。 As shown in FIG. 2, the insulating cylinder part 51 has the 1st engaging part 51b in four places in the internal peripheral surface. The first engaging portions 51b are provided at equal intervals in the circumferential direction of the insulating cylinder portion 51 and have a flat surface shape. Each first engagement portion 51 b engages with a locking surface 43 d of the positive electrode base portion 43 and prevents rotation of the positive electrode terminal cover 50 along the circumferential direction.
図3及び図5(a)に示すように、蓋側絶縁部52は、蓋側絶縁部52の内周縁に沿って外方へ突出する係合突部52aを有し、この係合突部52aは円環状である。蓋側絶縁部52は、係合突部52aの外周面の四箇所に第2係合部52bを有する。第2係合部52bは、係合突部52aの周方向へ等間隔おきに設けられている。また、第2係合部52bは、係合突部52aの先端面から基端に向けて下り傾斜する傾斜面状である。 As shown in FIGS. 3 and 5A, the lid-side insulating portion 52 has an engaging protrusion 52 a that protrudes outward along the inner peripheral edge of the lid-side insulating portion 52. 52a has an annular shape. The lid-side insulating portion 52 has second engaging portions 52b at four locations on the outer peripheral surface of the engaging protrusion 52a. The second engaging portions 52b are provided at equal intervals in the circumferential direction of the engaging protrusions 52a. The second engaging portion 52b has an inclined surface shape that inclines downward from the distal end surface of the engaging protrusion 52a toward the proximal end.
そして、蓋側絶縁部52は、座面43bに支持され、正極基部43の座面43bと、蓋14の内面14aとの間を絶縁するとともに、蓋側絶縁部52が正極柱部44の根本全周及びシール座面43aを取り囲んでいる。また、蓋側絶縁部52は、シール座面43a上に支持されたOリング56を取り囲んでいる。 The lid-side insulating portion 52 is supported by the seating surface 43 b and insulates between the seating surface 43 b of the positive electrode base portion 43 and the inner surface 14 a of the lid 14, and the lid-side insulating portion 52 is the root of the positive electrode column portion 44. It surrounds the entire circumference and the seal seat surface 43a. The lid-side insulating portion 52 surrounds the O-ring 56 supported on the seal seat surface 43a.
図5(b)に示すように、座面43bからのシール座面43aの突出高さH1と、押し潰される前のOリング56の直径Rとの和は、蓋側絶縁部52の厚み方向に沿った長さL1より長く設定されている。このため、座面43bに蓋側絶縁部52が支持された状態では、Oリング56は、係合突部52aの先端より突出し、その突出した部分が蓋14の内面14aに押圧されるとともに、Oリング56の潰し代となる。 As shown in FIG. 5 (b), the sum of the protruding height H 1 of the seal seat surface 43 a from the seat surface 43 b and the diameter R of the O-ring 56 before being crushed is the thickness direction of the lid-side insulating portion 52. Is set to be longer than the length L1. For this reason, in the state where the lid-side insulating portion 52 is supported by the seat surface 43b, the O-ring 56 protrudes from the tip of the engaging protrusion 52a, and the protruding portion is pressed against the inner surface 14a of the cover 14, This is a crushing allowance for the O-ring 56.
ここで、図5(a)に示すように、正極柱部44において、正極基部43からの突出方向の先端に位置する面を先端面44fとする。そして、蓋14の凹部15において、蓋14の厚み方向に沿った内面14aからの長さを深さFとすると、この深さFは、蓋14の外面14cから正極柱部44の先端面44fまでの長さの公差より長く設定されている。外面14cから正極柱部44の先端面44fまでの長さの公差とは、蓋側絶縁部52の係合突部52aの厚み、座面43bから先端面44fまでの長さ、後述する外部カバー19のフランジ部25の厚み、蓋14の厚みのそれぞれの公差の和からなる。 Here, as shown in FIG. 5A, in the positive electrode column portion 44, a surface located at the front end in the protruding direction from the positive electrode base portion 43 is defined as a front end surface 44f. In the recess 15 of the lid 14, when the length from the inner surface 14 a along the thickness direction of the lid 14 is a depth F, the depth F is from the outer surface 14 c of the lid 14 to the tip surface 44 f of the positive electrode column portion 44. It is set longer than the tolerance of the length. The tolerance of the length from the outer surface 14c to the front end surface 44f of the positive pole post 44 is the thickness of the engaging protrusion 52a of the lid-side insulating portion 52, the length from the seat surface 43b to the front end surface 44f, an external cover described later It consists of the sum of the tolerances of the thickness of the 19 flange portions 25 and the thickness of the lid 14.
図2、図3及び図5(a)に示すように、正極基部43において、厚み方向にシール座面43aと反対側の面には、組立体側絶縁板49が装着されている。組立体側絶縁板49は、正極基部43を覆う四角板状であり、四箇所に掛止爪49aを有する。掛止爪49aは、正極基部43と端子溶接片33bが溶接された状態で、端子溶接片33bにおいて、正極基部43の外周面よりも突出した部位に掛止する。また、組立体側絶縁板49は、正極基部43に端子溶接片33bが溶接された状態で、溶接片43cが挿入される挿入穴49bを有する。組立体側絶縁板49は、正極基部43と電極組立体20を絶縁する。 As shown in FIGS. 2, 3 and 5A, an assembly-side insulating plate 49 is mounted on the surface of the positive electrode base 43 opposite to the seal seat surface 43a in the thickness direction. The assembly-side insulating plate 49 has a square plate shape that covers the positive electrode base portion 43, and has latching claws 49a at four locations. The latching claw 49a is latched on a portion of the terminal weld piece 33b that protrudes from the outer peripheral surface of the positive electrode base 43 in a state where the positive electrode base 43 and the terminal weld piece 33b are welded. The assembly-side insulating plate 49 has an insertion hole 49b into which the weld piece 43c is inserted in a state where the terminal weld piece 33b is welded to the positive electrode base portion 43. The assembly-side insulating plate 49 insulates the positive electrode base portion 43 from the electrode assembly 20.
そして、正極端子カバー50における蓋側絶縁部52により、蓋14と正極端子41が電気的に絶縁されている。また、絶縁筒部51により、ケース本体13と、正極端子41とが電気的に絶縁されている。さらに、組立体側絶縁板49により、電極組立体20と正極端子41とが電気的に絶縁されている。 The lid 14 and the positive terminal 41 are electrically insulated by the lid-side insulating portion 52 in the positive terminal cover 50. Further, the case main body 13 and the positive electrode terminal 41 are electrically insulated by the insulating cylinder portion 51. Further, the electrode assembly 20 and the positive terminal 41 are electrically insulated by the assembly-side insulating plate 49.
図2、図3、及び図4(a)に示すように、負極導電部材37は、板材を屈曲させて形成されている。負極導電部材37は、屈曲部よりも長手方向の一方側に矩形状のタブ溶接片37aを備えるとともに、屈曲部よりも長手方向の他方側に円形状の端子溶接片37bを備える。端子溶接片37bは、中央部に円環状の破断溝37cを備えるとともに、破断溝37cで囲まれた第1接点部37dを備える。なお、負極導電部材37の屈曲部は、タブ溶接片37a及び端子溶接片37bよりも細い。端子溶接片37bには、電極端子としての負極端子42が溶接されている。 As shown in FIGS. 2, 3, and 4A, the negative electrode conductive member 37 is formed by bending a plate material. The negative electrode conductive member 37 includes a rectangular tab weld piece 37a on one side in the longitudinal direction from the bent portion, and a circular terminal weld piece 37b on the other side in the longitudinal direction from the bent portion. The terminal weld piece 37b includes an annular fracture groove 37c at the center and a first contact portion 37d surrounded by the fracture groove 37c. The bent portion of the negative electrode conductive member 37 is thinner than the tab weld piece 37a and the terminal weld piece 37b. A negative electrode terminal 42 as an electrode terminal is welded to the terminal weld piece 37b.
図4(a)に示すように、負極端子42は、基部としての円盤状の負極基部53を有する。また、負極端子42は、負極基部53の中央から立設された極柱部としての円筒状の負極柱部54を有するとともに、この負極柱部54の外周面に雄ねじ部54aを有する。負極基部53は、負極柱部54を取り囲み、かつ蓋14の内面14aに対向するシール座面53aと、シール座面53aを取り囲み、かつシール座面53aより低い位置に座面53bを有する。また、負極基部53は、厚み方向においてシール座面53aと反対側の面に逃がし凹部53cを有する。 As shown in FIG. 4A, the negative electrode terminal 42 has a disc-shaped negative electrode base 53 as a base. Further, the negative electrode terminal 42 has a cylindrical negative electrode column portion 54 as a pole column portion erected from the center of the negative electrode base portion 53, and a male screw portion 54 a on the outer peripheral surface of the negative electrode column portion 54. The negative electrode base portion 53 surrounds the negative electrode column portion 54 and has a seal seat surface 53a facing the inner surface 14a of the lid 14, and surrounds the seal seat surface 53a and has a seat surface 53b at a position lower than the seal seat surface 53a. The negative electrode base 53 has a relief recess 53c on the surface opposite to the seal seat surface 53a in the thickness direction.
図3に示すように、負極基部53は、その外周面に係止面53dを四箇所有し、四つの係止面53dは負極基部53の周方向に等間隔おきに設けられている。各係止面53dは平坦面状である。負極基部53には、樹脂製及び円筒状の負極端子カバー58が装着されている。負極端子カバー58は、負極基部53の外周面を覆う円筒状の絶縁筒部59と、絶縁筒部59の軸方向一端に設けられた円環状の蓋側絶縁部60とを有する。 As shown in FIG. 3, the negative electrode base 53 has four locking surfaces 53 d on its outer peripheral surface, and the four locking surfaces 53 d are provided at equal intervals in the circumferential direction of the negative electrode base 53. Each locking surface 53d is a flat surface. A resin-made and cylindrical negative electrode terminal cover 58 is attached to the negative electrode base 53. The negative electrode terminal cover 58 includes a cylindrical insulating cylinder part 59 that covers the outer peripheral surface of the negative electrode base 53, and an annular lid-side insulating part 60 provided at one end in the axial direction of the insulating cylinder part 59.
図2に示すように、絶縁筒部59は、その内周面に第1係合部59bを四箇所に有する。第1係合部59bは、絶縁筒部59の周方向へ等間隔おきに設けられ、平坦面状である。各第1係合部59bは、負極基部53の係止面53dに係合し、負極端子カバー58の周方向への回り止めをする。 As shown in FIG. 2, the insulating cylinder part 59 has the 1st engaging part 59b in four places in the internal peripheral surface. The first engaging portions 59b are provided at equal intervals in the circumferential direction of the insulating cylinder portion 59 and have a flat surface shape. Each first engagement portion 59 b engages with the locking surface 53 d of the negative electrode base portion 53 to prevent the negative electrode terminal cover 58 from rotating in the circumferential direction.
図3及び図4(a)に示すように、蓋側絶縁部60は、蓋側絶縁部60の内周縁に沿って係合突部60aを有し、この係合突部60aの外周面の四箇所に第2係合部60bを有する。第2係合部60bは、係合突部60aの周方向へ等間隔おきに設けられている。また、第2係合部60bは、係合突部60aの先端面から基端に向けて下り傾斜する傾斜面状である。 As shown in FIGS. 3 and 4A, the lid-side insulating portion 60 has an engaging protrusion 60a along the inner peripheral edge of the lid-side insulating portion 60, and the outer peripheral surface of the engaging protrusion 60a. There are second engaging portions 60b at four locations. The second engaging portions 60b are provided at equal intervals in the circumferential direction of the engaging protrusion 60a. Further, the second engaging portion 60b has an inclined surface shape that inclines downward from the front end surface of the engaging protrusion 60a toward the base end.
そして、蓋側絶縁部60は、負極基部53の座面53bに支持され、負極基部53と蓋14の内面14aとの間を絶縁するとともに、蓋側絶縁部60が負極柱部54の根本全周及びシール座面53aを取り囲んでいる。また、蓋側絶縁部60は、シール座面53a上に支持されたOリング56を取り囲んでいる。 The lid-side insulating part 60 is supported by the seating surface 53 b of the negative electrode base 53 to insulate between the negative electrode base 53 and the inner surface 14 a of the lid 14, and the lid-side insulating part 60 is completely attached to the negative pole column part 54. The circumference and the seal seat surface 53a are surrounded. The lid-side insulating portion 60 surrounds the O-ring 56 supported on the seal seat surface 53a.
ここで、図4(b)に示すように、座面53bからのシール座面53aの突出高さH2と、押し潰される前のOリング56の直径Rとの和は、蓋側絶縁部60の厚み方向に沿った長さL2より長く設定されている。このため、座面53bに蓋側絶縁部60が支持された状態では、Oリング56は、係合突部60aの先端より突出し、その突出した部分が蓋14の内面14aに押圧されるとともに、Oリング56の潰し代となる。 Here, as shown in FIG. 4B, the sum of the protrusion height H2 of the seal seat surface 53a from the seat surface 53b and the diameter R of the O-ring 56 before being crushed is the lid-side insulating portion 60. Longer than the length L2 along the thickness direction. For this reason, in the state where the lid-side insulating portion 60 is supported by the seat surface 53b, the O-ring 56 protrudes from the tip of the engaging protrusion 60a, and the protruding portion is pressed against the inner surface 14a of the cover 14, This is a crushing allowance for the O-ring 56.
図4(a)に示すように、負極柱部54において、負極基部53からの突出方向の先端に位置する面を先端面54fとする。そして、凹部15の深さFは、蓋14の外面14cから負極柱部54の先端面54fまでの長さの公差より長く設定されている。外面14cから負極柱部54の先端面54fまでの長さの公差とは、蓋側絶縁部60の係合突部60aの厚み、座面53bから先端面54fまでの長さ、後述する外部カバー19のフランジ部25の厚み、蓋14の厚みのそれぞれの公差の和からなる。 As shown in FIG. 4A, in the negative electrode column portion 54, a surface located at the front end in the protruding direction from the negative electrode base portion 53 is defined as a front end surface 54f. And the depth F of the recessed part 15 is set longer than the tolerance of the length from the outer surface 14c of the lid | cover 14 to the front end surface 54f of the negative electrode pillar part 54. FIG. The tolerance of the length from the outer surface 14c to the front end surface 54f of the negative pole post 54 is the thickness of the engagement protrusion 60a of the lid-side insulating portion 60, the length from the seat surface 53b to the front end surface 54f, an external cover described later It consists of the sum of the tolerances of the thickness of the 19 flange portions 25 and the thickness of the lid 14.
また、負極端子42には、電流遮断装置62が一体化されている。電流遮断装置62は、電極組立体20と負極端子42とを電気的に接続する。また、電流遮断装置62は、ケース12の内圧が所定レベルを超えて上昇したときに、電極組立体20と負極端子42との直列な通電経路を遮断する。なお、「所定レベルの内圧」とは、二次電池10が過充電(過電圧)状態や過昇温状態(活物質の熱暴走温度)となったときのケース12の内圧を意味する。また、「所定レベルの内圧」は、二次電池10の容量、出力電圧等の条件により設定される。 In addition, a current interrupt device 62 is integrated with the negative terminal 42. The current interrupt device 62 electrically connects the electrode assembly 20 and the negative terminal 42. In addition, the current interrupt device 62 interrupts the serial energization path between the electrode assembly 20 and the negative terminal 42 when the internal pressure of the case 12 rises above a predetermined level. The “predetermined level of internal pressure” means the internal pressure of the case 12 when the secondary battery 10 is overcharged (overvoltage) or overheated (thermal runaway temperature of the active material). The “predetermined level of internal pressure” is set according to conditions such as the capacity of the secondary battery 10 and the output voltage.
電流遮断装置62は、ケース12の内部に配置されている。電流遮断装置62は、電極組立体20側から蓋14に向けて配置された、支持部材66、変形板63、負極導電部材37の端子溶接片37b、シール部材67、絶縁リング68、及び接点板65を備える。また、負極端子カバー58と、負極基部53と、シール部材67と、絶縁リング68と、変形板63と、端子溶接片37bと、支持部材66とは、金属製のカシメ部材69によって一体化されている。 The current interrupt device 62 is disposed inside the case 12. The current interrupt device 62 is arranged from the electrode assembly 20 side toward the lid 14, and includes a support member 66, a deformation plate 63, a terminal weld piece 37 b of the negative electrode conductive member 37, a seal member 67, an insulating ring 68, and a contact plate. 65. The negative electrode terminal cover 58, the negative electrode base 53, the seal member 67, the insulating ring 68, the deformation plate 63, the terminal weld piece 37b, and the support member 66 are integrated by a metal caulking member 69. ing.
変形板63は、金属製及び円板状のダイアフラムであり、変形板63の外周部は、端子溶接片37bに溶接によって接合されている。変形板63は、ケース12内から負極端子42内へのガスの流通を阻止する。また、変形板63は、端子溶接片37bへの溶接部に囲まれた部位に受圧部63aを備え、受圧部63aは、ケース12の内圧を受ける。さらに、変形板63は、受圧部63aの中央部に突起63bを備え、この突起63bは、端子溶接片37bの第1接点部37dに向けて突出している。ケース12の内圧が上述の所定レベルの内圧未満の状態では、変形板63は端子溶接片37bから離れる方向へ膨らむ状態にあり、突起63bは端子溶接片37bから離れている。 The deformation plate 63 is a metal-made and disk-shaped diaphragm, and the outer peripheral part of the deformation plate 63 is joined to the terminal welding piece 37b by welding. The deformation plate 63 prevents the gas from flowing from the inside of the case 12 into the negative electrode terminal 42. Further, the deformable plate 63 includes a pressure receiving portion 63a at a portion surrounded by a welded portion to the terminal weld piece 37b, and the pressure receiving portion 63a receives the internal pressure of the case 12. Further, the deformable plate 63 includes a protrusion 63b at the center of the pressure receiving portion 63a, and the protrusion 63b protrudes toward the first contact portion 37d of the terminal weld piece 37b. When the internal pressure of the case 12 is less than the above-mentioned predetermined level of internal pressure, the deformable plate 63 is in a state of expanding away from the terminal weld piece 37b, and the protrusion 63b is separated from the terminal weld piece 37b.
接点板65は、導電性の金属製及び円板状のダイアフラムであり、接点板65の外周部は、電流遮断装置62の組み付けに伴い、負極基部53と絶縁リング68との間に挟持されている。接点板65は、中央部に第2接点部65aを備え、第2接点部65aは、負極導電部材37の第1接点部37dに接触している。 The contact plate 65 is a conductive metal and disc-shaped diaphragm, and the outer periphery of the contact plate 65 is sandwiched between the negative electrode base 53 and the insulating ring 68 as the current interrupting device 62 is assembled. Yes. The contact plate 65 includes a second contact portion 65 a at the center, and the second contact portion 65 a is in contact with the first contact portion 37 d of the negative electrode conductive member 37.
絶縁リング68は、接点板65の外周部と端子溶接片37bとの間に介在し、絶縁リング68によって接点板65と端子溶接片37bは、電気的に絶縁されている。接点板65には連通孔65bが設けられている。 The insulating ring 68 is interposed between the outer peripheral portion of the contact plate 65 and the terminal weld piece 37b, and the contact plate 65 and the terminal weld piece 37b are electrically insulated by the insulating ring 68. The contact plate 65 is provided with a communication hole 65b.
支持部材66は、例えば樹脂製であり、平面視リング状であるとともに、変形板63を電極組立体20側から支持している。支持部材66は、中央部にガス孔66aを有し、ケース12内のガスを電流遮断装置62内に導入する。 The support member 66 is made of, for example, resin, has a ring shape in plan view, and supports the deformation plate 63 from the electrode assembly 20 side. The support member 66 has a gas hole 66 a at the center, and introduces the gas in the case 12 into the current interrupt device 62.
このように構成された電流遮断装置62では、ケース12の内圧が所定レベルを超えて上昇すると、支持部材66のガス孔66aから電流遮断装置62内にガスが導入される。
図4(a)の2点鎖線に示すように、変形板63がケース12の内圧を受けて端子溶接片37bに向けて変形する。すると、突起63bが端子溶接片37bに向けて移動し、端子溶接片37bの第1接点部37d、及び接点板65の第2接点部65aに衝撃を与える。その結果、端子溶接片37bが破断溝37cから破断し、第1接点部37dが端子溶接片37bから分離し、電極組立体20と負極端子42との直列な通電経路を遮断する。また、接点板65の第2接点部65aは、負極基部53の逃がし凹部53cに入り込む。
In the current interrupt device 62 configured as described above, when the internal pressure of the case 12 rises above a predetermined level, gas is introduced into the current interrupt device 62 from the gas hole 66a of the support member 66.
As shown by the two-dot chain line in FIG. 4A, the deformable plate 63 receives the internal pressure of the case 12 and deforms toward the terminal weld piece 37b. Then, the protrusion 63b moves toward the terminal weld piece 37b, and gives an impact to the first contact portion 37d of the terminal weld piece 37b and the second contact portion 65a of the contact plate 65. As a result, the terminal weld piece 37b breaks from the break groove 37c, the first contact portion 37d is separated from the terminal weld piece 37b, and the series current path between the electrode assembly 20 and the negative electrode terminal 42 is interrupted. Further, the second contact portion 65 a of the contact plate 65 enters the relief recess 53 c of the negative electrode base portion 53.
図3に示すように、正極柱部44及び負極柱部54は、先端面44f,54fから軸方向に沿って凹む治具用係合部57を備える。治具用係合部57は、正極柱部44及び負極柱部54の軸方向に沿った平面視で六角形状であり、軸方向に沿って先端面44f,54fから六角形状に凹んでいる。そして、治具用係合部57は、6つ内側面から形成される6つの係合面57aを等間隔おきに備える。 As shown in FIG. 3, the positive electrode column portion 44 and the negative electrode column portion 54 include a jig engaging portion 57 that is recessed from the front end surfaces 44 f and 54 f along the axial direction. The jig engaging portion 57 has a hexagonal shape in a plan view along the axial direction of the positive electrode column portion 44 and the negative electrode column portion 54, and is recessed in a hexagonal shape from the front end surfaces 44f and 54f along the axial direction. The jig engaging portion 57 includes six engaging surfaces 57a formed from six inner surfaces at regular intervals.
図8に示すように、治具用係合部57には、金属製の治具48が係合可能である。治具48は、軸方向全体に亘って断面が六角形の棒状であり、6つの側面から形成される6つの係合面48aを備える。 As shown in FIG. 8, a metal jig 48 can be engaged with the jig engaging portion 57. The jig 48 has a hexagonal bar shape in cross section along the entire axial direction, and includes six engaging surfaces 48a formed from six side surfaces.
そして、治具48を治具用係合部57に挿入すると、治具用係合部57の6つの係合面57aと、治具48の6つの係合面48aが係合可能となり、係合箇所が6箇所形成されるようになっている。また、治具48は、係合面48aを治具用係合部57の係合面57aに係合させた状態で、先端面44f,54fから突出する長さを有する。なお、治具48が治具用係合部57に挿入された状態では、治具48の外面と、治具用係合部57の内面との間にはクリアランスが形成され、正極端子41及び負極端子42は、クリアランスの範囲内ではがたつき(回転)可能である。 When the jig 48 is inserted into the jig engaging portion 57, the six engaging surfaces 57a of the jig engaging portion 57 and the six engaging surfaces 48a of the jig 48 can be engaged. Six joints are formed. The jig 48 has a length protruding from the tip surfaces 44f and 54f in a state where the engagement surface 48a is engaged with the engagement surface 57a of the jig engagement portion 57. In the state where the jig 48 is inserted into the jig engaging portion 57, a clearance is formed between the outer surface of the jig 48 and the inner surface of the jig engaging portion 57. The negative electrode terminal 42 can rattle (rotate) within the clearance range.
図4(a)及び図5(a)に示すように、正極端子41は、治具用係合部57より軸方向奥側に雌ねじ部44bを有し、負極端子42は、治具用係合部57より軸方向奥側には雌ねじ部54bを有する。 As shown in FIGS. 4A and 5A, the positive electrode terminal 41 has a female screw portion 44b on the inner side in the axial direction from the jig engagement portion 57, and the negative electrode terminal 42 has a jig engagement. An internal thread portion 54b is provided on the inner side in the axial direction from the joint portion 57.
上記構成の正極端子41及び負極端子42において、正極柱部44及び負極柱部54は、蓋14の挿通孔14bよりケース12外へ突出している。ケース12外において、正極柱部44の雄ねじ部44a及び負極柱部54の雄ねじ部54aにはケース12の外方からナット55が螺合され、正極端子41及び負極端子42が蓋14に締結されている。 In the positive electrode terminal 41 and the negative electrode terminal 42 configured as described above, the positive electrode column portion 44 and the negative electrode column portion 54 protrude from the case 12 through the insertion hole 14 b of the lid 14. Outside the case 12, a nut 55 is screwed from the outside of the case 12 to the male screw portion 44 a of the positive electrode column portion 44 and the male screw portion 54 a of the negative electrode column portion 54, and the positive electrode terminal 41 and the negative electrode terminal 42 are fastened to the lid 14. ing.
また、蓋14の挿通孔14bの内周面と、正極柱部44又は負極柱部54の外周面とは、外部カバー19によって絶縁されている。外部カバー19は、円環状の筒状部24と、この筒状部24の軸方向の一端から径方向外方へ延設されたフランジ部25とを有する。筒状部24は、挿通孔14bの内周面と、正極柱部44又は負極柱部54の外周面との間に介装されている。フランジ部25は、蓋14の外面14cにおいて挿通孔14bの周囲に設けられている。 Further, the inner peripheral surface of the insertion hole 14 b of the lid 14 and the outer peripheral surface of the positive electrode column portion 44 or the negative electrode column portion 54 are insulated by the external cover 19. The outer cover 19 includes an annular cylindrical portion 24 and a flange portion 25 that extends radially outward from one axial end of the cylindrical portion 24. The cylindrical portion 24 is interposed between the inner peripheral surface of the insertion hole 14 b and the outer peripheral surface of the positive electrode column portion 44 or the negative electrode column portion 54. The flange portion 25 is provided around the insertion hole 14 b on the outer surface 14 c of the lid 14.
二次電池10では、蓋14の外面14cにおける挿通孔14bの周縁とナット55の蓋14側の端面との間には外部カバー19のフランジ部25が挟持されており、このフランジ部25によってナット55と蓋14が絶縁されている。また、ナット55が正極柱部44及び負極柱部54に螺合されることによって、ナット55と正極基部43及び負極基部53との間に、フランジ部25、蓋14、Oリング56、蓋側絶縁部52,60が狭持されている。この締結状態では、Oリング56は、圧縮状態で蓋14の内面14aと、シール座面43a,53aとに密接し、挿通孔14bの周囲をシールしている。 In the secondary battery 10, the flange portion 25 of the outer cover 19 is sandwiched between the peripheral edge of the insertion hole 14 b in the outer surface 14 c of the lid 14 and the end surface of the nut 55 on the lid 14 side. 55 and the lid 14 are insulated. Further, the nut 55 is screwed into the positive electrode column portion 44 and the negative electrode column portion 54, whereby the flange portion 25, the lid 14, the O-ring 56, and the lid side are provided between the nut 55 and the positive electrode base portion 43 and the negative electrode base portion 53. The insulating parts 52 and 60 are sandwiched. In this fastened state, the O-ring 56 is in close contact with the inner surface 14a of the lid 14 and the seal seat surfaces 43a and 53a in a compressed state, and seals the periphery of the insertion hole 14b.
図1及び図9に示すように、二次電池10同士は、正極端子41が隣り合う二次電池10の負極端子42に、負極端子42が隣り合う二次電池10の正極端子41にそれぞれ導通部材70を介して接続される。導通部材70は、矩形板状であり、一対の挿通部70aを有する。この導通部材70は、ボルト状の接続部材71によって正極柱部44及び負極柱部54に固定されている。接続部材71は、雌ねじ部44b,54bに螺合する接続用雄ねじ部71aと、接続用雄ねじ部71aの軸方向一端の頭部71bとを有する。 As shown in FIGS. 1 and 9, the secondary batteries 10 are electrically connected to the negative terminal 42 of the secondary battery 10 where the positive terminal 41 is adjacent to the positive terminal 41 of the secondary battery 10 where the negative terminal 42 is adjacent. It is connected via the member 70. The conducting member 70 has a rectangular plate shape and has a pair of insertion portions 70a. The conducting member 70 is fixed to the positive column 44 and the negative column 54 by a bolt-shaped connecting member 71. The connecting member 71 includes a connecting male screw portion 71a that is screwed into the female screw portions 44b and 54b, and a head portion 71b at one axial end of the connecting male screw portion 71a.
次に、二次電池10の製造方法について作用とともに説明する。
さて、図5(a)に示すように、正極の端子溶接片33bに正極端子41を溶接する。次に、タブ溶接片33aを正極タブ群45に溶接する。続いて、正極端子41のシール座面43aにOリング56を載せるとともに、Oリング56を取り囲むように正極基部43に正極端子カバー50を装着する。このとき、正極基部43の係止面43dに正極端子カバー50の第1係合部51bを係合させ、正極端子カバー50を回り止めした状態とする。
Next, the manufacturing method of the secondary battery 10 will be described together with the operation.
As shown in FIG. 5A, the positive terminal 41 is welded to the positive terminal welding piece 33b. Next, the tab weld piece 33 a is welded to the positive electrode tab group 45. Subsequently, the O-ring 56 is placed on the seal seat surface 43 a of the positive terminal 41, and the positive terminal cover 50 is attached to the positive base 43 so as to surround the O-ring 56. At this time, the first engagement portion 51b of the positive electrode terminal cover 50 is engaged with the locking surface 43d of the positive electrode base portion 43 so that the positive electrode terminal cover 50 is prevented from rotating.
次に、端子溶接片33bにおいて、正極基部43の外周面より突出した部位に、組立体側絶縁板49の掛止爪49aを掛止させ、正極基部43に組立体側絶縁板49を装着する。 Next, in the terminal welding piece 33 b, the latching claw 49 a of the assembly-side insulating plate 49 is hooked at a portion protruding from the outer peripheral surface of the positive electrode base 43, and the assembly-side insulating plate 49 is attached to the positive electrode base 43.
次に、図4(a)に示すように、負極の端子溶接片37bに負極端子42を溶接するとともに、負極基部53に電流遮断装置62を組み付けつつ、負極端子カバー58を負極基部53に装着する。このとき、負極基部53の係止面53dに負極端子カバー58の第1係合部59bを係合させ、負極端子カバー58を回り止めした状態とする。そして、負極基部53と、端子溶接片37bと、電流遮断装置62と、負極端子カバー58をカシメ部材69で一体化する。また、負極端子42のシール座面53aにOリング56を載せる。 Next, as shown in FIG. 4 (a), the negative electrode terminal 42 is welded to the negative electrode terminal weld piece 37 b and the negative electrode terminal cover 58 is attached to the negative electrode base 53 while the current blocking device 62 is assembled to the negative electrode base 53. To do. At this time, the first engaging portion 59b of the negative electrode terminal cover 58 is engaged with the locking surface 53d of the negative electrode base portion 53 so that the negative electrode terminal cover 58 is prevented from rotating. Then, the negative electrode base 53, the terminal welding piece 37 b, the current interrupt device 62, and the negative electrode terminal cover 58 are integrated with a caulking member 69. Further, the O-ring 56 is placed on the seal seat surface 53 a of the negative terminal 42.
次に、図6に示すように、正極端子カバー50の蓋側絶縁部52、及び負極端子カバー58の蓋側絶縁部60に蓋14を載せるとともに、一方の挿通孔14bに正極柱部44を挿通し、他方の挿通孔14bに負極柱部54を挿通する。さらに、挿通孔14bの内周面と正極柱部44との間、及び挿通孔14bの内周面と負極柱部54との間に外部カバー19を介装する。 Next, as shown in FIG. 6, the lid 14 is placed on the lid-side insulating portion 52 of the positive electrode terminal cover 50 and the lid-side insulating portion 60 of the negative electrode terminal cover 58, and the positive pole portion 44 is placed in one insertion hole 14 b. The negative pole portion 54 is inserted through the other insertion hole 14b. Further, the outer cover 19 is interposed between the inner peripheral surface of the insertion hole 14 b and the positive electrode column portion 44 and between the inner peripheral surface of the insertion hole 14 b and the negative electrode column portion 54.
次に、図7及び図8に示すように、正極柱部44及び負極柱部54の治具用係合部57内に治具48を挿入し、治具48の係合面48aを治具用係合部57の係合面57aに係合させ、係合箇所を6箇所形成する。そして、両治具48を、工具Kで回り止めした状態で正極柱部44の雄ねじ部44a及び負極柱部54の雄ねじ部54aにナット55を螺合する。 Next, as shown in FIGS. 7 and 8, the jig 48 is inserted into the jig engaging portion 57 of the positive electrode column portion 44 and the negative electrode column portion 54, and the engagement surface 48 a of the jig 48 is set to the jig. The engagement portion 57 is engaged with the engagement surface 57a to form six engagement portions. Then, the nuts 55 are screwed into the male screw portions 44 a of the positive electrode column portion 44 and the male screw portions 54 a of the negative electrode column portion 54 with both the jigs 48 being prevented from rotating with the tool K.
その結果、ナット55によって、正極端子41及び負極端子42が蓋14に締結される。次に、治具48を治具用係合部57から抜き取った後、電極組立体20をケース本体13内に収容するとともに、蓋14をケース本体13に接合し、ケース12を形成すると、二次電池10が組立てられる。 As a result, the positive terminal 41 and the negative terminal 42 are fastened to the lid 14 by the nut 55. Next, after the jig 48 is removed from the jig engaging portion 57, the electrode assembly 20 is accommodated in the case main body 13 and the lid 14 is joined to the case main body 13 to form the case 12. The secondary battery 10 is assembled.
図9に示すように、複数の二次電池10を接続する場合は、接続部材71の接続用雄ねじ部71aを導通部材70の挿通部70aに挿通し、その接続用雄ねじ部71aを各雌ねじ部44b,54bに螺合する。そして、頭部71bによって、導通部材70を各先端面44f,54fに向けて押圧するとともに、挿通部70aの周囲を各先端面44f,54fに押し付ける。すると、接続部材71によって導通部材70が正極端子41及び負極端子42に固定され、導通部材70によって、二次電池10同士が電気的に接続される。 As shown in FIG. 9, when connecting a plurality of secondary batteries 10, the connection male screw portion 71 a of the connection member 71 is inserted into the insertion portion 70 a of the conduction member 70, and the connection male screw portion 71 a is connected to each female screw portion. 44b and 54b. Then, the head 71b presses the conduction member 70 toward the front end surfaces 44f and 54f, and presses the periphery of the insertion portion 70a against the front end surfaces 44f and 54f. Then, the conducting member 70 is fixed to the positive terminal 41 and the negative terminal 42 by the connecting member 71, and the secondary batteries 10 are electrically connected by the conducting member 70.
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)治具用係合部57に治具48を係合させ、治具48を回り止めした状態で各雄ねじ部44a,54aにナット55を螺合する作業を行う。このため、ナット55の螺合の際、正極端子41及び負極端子42は、ナット55に連れ回りしようとするが、回り止めされた治具48に治具用係合部57が係合し、正極端子41及び負極端子42が回転すること(連れ回り)が抑制される。よって、正極端子41及び負極端子42の回り止めは、金属製の治具48と、正極端子41及び負極端子42の係合によって行われ、部品を損傷させずに回り止めを抑制することができる。
According to the above embodiment, the following effects can be obtained.
(1) The jig 48 is engaged with the jig engaging portion 57, and the nut 55 is screwed into the male screw portions 44a and 54a while the jig 48 is prevented from rotating. Therefore, when the nut 55 is screwed, the positive electrode terminal 41 and the negative electrode terminal 42 try to rotate with the nut 55, but the jig engaging portion 57 engages with the jig 48 that is prevented from rotating, The positive terminal 41 and the negative terminal 42 are prevented from rotating (following). Therefore, rotation prevention of the positive electrode terminal 41 and the negative electrode terminal 42 is performed by engagement of the metal jig 48 and the positive electrode terminal 41 and the negative electrode terminal 42, and rotation prevention can be suppressed without damaging components. .
また、正極端子カバー50は、第1係合部51bが正極基部43の係止面43dに係合して回り止めされ、負極端子カバー58は、第1係合部59bが負極基部53の係止面53dに係合して回り止めされている。そして、接続部材71を各雌ねじ部44b,54bに螺合する際、正極端子41及び負極端子42は接続部材71に連れ回りしようとするが、各端子カバー50,58の第2係合部52b,60bが蓋14の壁部用係合部15aに係合する。このため、各端子カバー50,58が回り止めされた正極端子41及び負極端子42の連れ回りが抑制される。よって、正極端子41及び負極端子42の回り止めは、複数箇所に形成される係合によって行われるため、係合する部品を損傷させずに回り止めを抑制することができる。 Further, the positive terminal cover 50 is locked by the first engaging portion 51 b engaging the locking surface 43 d of the positive base portion 43, and the negative terminal cover 58 is engaged with the negative base portion 53 by the first engaging portion 59 b. The rotation is stopped by engaging with the stop surface 53d. When the connection member 71 is screwed into the female screw portions 44b and 54b, the positive terminal 41 and the negative terminal 42 try to rotate with the connection member 71. However, the second engagement portions 52b of the terminal covers 50 and 58 are used. , 60b engage with the wall engaging portion 15a of the lid 14. For this reason, the accompanying rotation of the positive terminal 41 and the negative terminal 42 in which the terminal covers 50 and 58 are prevented from rotating is suppressed. Therefore, since the rotation prevention of the positive electrode terminal 41 and the negative electrode terminal 42 is performed by the engagement formed in a plurality of places, the rotation prevention can be suppressed without damaging the engaged parts.
(2)蓋14の壁部用係合部15aは傾斜面を有し、各第2係合部52b,60bも傾斜面を有する。このため、万一、第2係合部52b,60bに壁部用係合部15aが乗り上げてしまっても、ナット55の螺合によって蓋14が電極組立体20に向けて押圧されると、傾斜面によって蓋14を傾斜面に沿って電極組立体20に向けて移動するように案内することができる。よって、第2係合部52b,60bに壁部用係合部15aが乗り上げてしまったまま、正極端子41及び負極端子42が蓋14に締結されることを抑制できる。 (2) The wall engaging portion 15a of the lid 14 has an inclined surface, and each of the second engaging portions 52b and 60b also has an inclined surface. For this reason, even if the wall engaging portion 15a rides on the second engaging portions 52b, 60b, if the lid 14 is pressed toward the electrode assembly 20 by the screwing of the nut 55, The inclined surface can guide the lid 14 to move toward the electrode assembly 20 along the inclined surface. Therefore, it is possible to suppress the positive terminal 41 and the negative terminal 42 from being fastened to the lid 14 while the wall engaging portion 15a has run over the second engaging portions 52b and 60b.
(3)壁部用係合部15aの傾斜面は、治具48と治具用係合部57との間のクリアランスの範囲内で正極端子41又は負極端子42が回転しても、壁部用係合部15aと各第2係合部52b,60bとの係合を維持できる範囲に形成されている。よって、ナット55を螺合する際、第2係合部52b,60bに壁部用係合部15aが乗り上げてしまっても、ナット55の螺合によって第2係合部52b,60bを凹部15内に収め、蓋14の誤組み付けを抑制することができる。 (3) Even if the positive electrode terminal 41 or the negative electrode terminal 42 rotates within the clearance range between the jig 48 and the jig engagement part 57, the inclined surface of the wall engagement part 15 a is The engagement portion 15a is formed in a range in which the engagement between the second engagement portions 52b and 60b can be maintained. Accordingly, when the nut 55 is screwed, even if the wall engaging portion 15a rides on the second engaging portions 52b and 60b, the second engaging portions 52b and 60b are screwed into the recess 15 by the screwing of the nut 55. It is possible to prevent the lid 14 from being assembled incorrectly.
(4)治具用係合部57は、平面視六角形状であり、6つの係合面57aを有する。また、治具48も断面六角形状であり、6つの係合面48aを有する。よって、治具用係合部57に治具48を係合させると係合箇所が6箇所形成される。したがって、ナット55の回転方向への力が係合箇所に作用しても、各係合箇所に発生する応力が分散され、各端子41,42の連れ回りを容易に抑制できる。 (4) The jig engaging portion 57 has a hexagonal shape in plan view and includes six engaging surfaces 57a. The jig 48 also has a hexagonal cross section and has six engaging surfaces 48a. Therefore, when the jig 48 is engaged with the jig engaging portion 57, six engagement points are formed. Therefore, even if the force in the rotation direction of the nut 55 acts on the engaging portion, the stress generated at each engaging portion is dispersed, and the accompanying rotation of the terminals 41 and 42 can be easily suppressed.
(5)蓋14の凹部15の深さFは、蓋14の外面14cから各先端面44f,54fまでの長さの公差より長く設定されている。このため、第2係合部52b,60bに蓋14の内面14aが乗り上げてしまったとき、蓋14の外面14cは、上記公差の範囲を越えて正極端子41又は負極端子42の先端面44f,54fに近付く。このため、蓋14の外面14cと、各先端面44f,54fとの距離を測定した場合、距離が公差で生じる差異には収まらず、蓋14が第2係合部52b,60bに乗り上げたことを検出できる。 (5) The depth F of the concave portion 15 of the lid 14 is set to be longer than the tolerance of the length from the outer surface 14c of the lid 14 to each of the front end surfaces 44f and 54f. For this reason, when the inner surface 14a of the lid 14 has ridden on the second engaging portions 52b and 60b, the outer surface 14c of the lid 14 exceeds the tolerance range, and the front end surface 44f of the positive electrode terminal 41 or the negative electrode terminal 42, It approaches 54f. For this reason, when the distance between the outer surface 14c of the lid 14 and each of the front end surfaces 44f and 54f is measured, the distance does not fall within the difference caused by the tolerance, and the lid 14 rides on the second engagement portions 52b and 60b. Can be detected.
(6)負極端子42は電流遮断装置62を一体に備え、電流遮断装置62を機能させるために負極導電部材37には破断溝37cが設けられている。本実施形態では、負極において、係止面53dと、第1係合部59bと、第2係合部60bと、壁部用係合部15aとの係合により、負極端子42の連れ回りを抑制できる。このため、負極端子42の連れ回りによって破断溝37cが破断してしまうことを抑制できる。 (6) The negative electrode terminal 42 is integrally provided with a current interrupting device 62, and a breaking groove 37c is provided in the negative electrode conductive member 37 in order to make the current interrupting device 62 function. In the present embodiment, in the negative electrode, the negative electrode terminal 42 is rotated by the engagement of the locking surface 53d, the first engaging portion 59b, the second engaging portion 60b, and the wall engaging portion 15a. Can be suppressed. For this reason, it can suppress that the fracture | rupture groove | channel 37c will fracture | rupture by the accompanying rotation of the negative electrode terminal 42. FIG.
(7)正極端子41は、円筒状の溶接片43cを端子溶接片33bに溶接して正極導電部材33と一体化されている。本実施形態では、正極において、係止面43dと、第1係合部51bと、第2係合部52bと、壁部用係合部15aとの係合により、正極端子41の連れ回りを抑制できる。このため、正極端子41の連れ回りによって溶接片43cが端子溶接片33bから破断してしまうことを抑制できる。 (7) The positive electrode terminal 41 is integrated with the positive electrode conductive member 33 by welding a cylindrical weld piece 43c to the terminal weld piece 33b. In the present embodiment, in the positive electrode, the positive terminal 41 is rotated by the engagement of the locking surface 43d, the first engaging portion 51b, the second engaging portion 52b, and the wall engaging portion 15a. Can be suppressed. For this reason, it can suppress that the welding piece 43c fractures | ruptures from the terminal welding piece 33b by the accompanying rotation of the positive electrode terminal 41. FIG.
(8)蓋14の壁部用係合部15aは、蓋14の長手方向に延びる状態で設けられている。このため、ナット55の螺合時や、接続部材71の螺合時、壁部用係合部15aと第2係合部52b,60bとの係合による回り止めにより、タブ溶接片33a,37aが、ケース本体13の長側壁の内面に接触することを抑制できる。 (8) The wall engaging portion 15 a of the lid 14 is provided so as to extend in the longitudinal direction of the lid 14. For this reason, when the nut 55 is screwed or when the connection member 71 is screwed, the tab weld pieces 33a and 37a are prevented from being rotated by the engagement between the wall engaging portion 15a and the second engaging portions 52b and 60b. However, it can suppress contacting the inner surface of the long side wall of the case main body 13.
(9)各シール座面43a,53aは、各座面43b,53bよりも突出している。このため、各シール座面43aにOリング56を載せたとき、各座面43b,53bに支持された各係合突部52a,60aの先端よりOリング56が突出する。よって、Oリング56に潰し代を確保し、Oリング56により挿通孔14bをシールできる。 (9) Each seal seat surface 43a, 53a protrudes from each seat surface 43b, 53b. For this reason, when the O-ring 56 is placed on each seal seat surface 43a, the O-ring 56 protrudes from the tips of the engaging projections 52a and 60a supported by the seat surfaces 43b and 53b. Therefore, a crushing allowance can be secured for the O-ring 56 and the insertion hole 14 b can be sealed by the O-ring 56.
なお、上記実施形態は以下のように変更してもよい。
○ 負極端子42に電流遮断装置62が一体化されず、負極端子42は正極端子41と同じ構造であってもよい。
In addition, you may change the said embodiment as follows.
The current interrupting device 62 may not be integrated with the negative terminal 42, and the negative terminal 42 may have the same structure as the positive terminal 41.
○ 凹部15の深さFは、蓋14の外面14cから各極柱部44,54の先端面44f,54fまでの長さの公差と同じでもよい。
○ 治具48及び治具用係合部57は、互いに係合できれば、その形状は適宜変更してもよい。
The depth F of the recess 15 may be the same as the tolerance of the length from the outer surface 14 c of the lid 14 to the tip surfaces 44 f and 54 f of the pole columns 44 and 54.
The shape of the jig 48 and the jig engaging portion 57 may be appropriately changed as long as they can be engaged with each other.
○ 壁部用係合部15aは傾斜面を有していなくてもよく、蓋14の内面14a及び外面14cに直交するように形成されていてもよい。又は、壁部用係合部15aは、蓋14の内面14a及び外面14cに直交する面を有し、かつ内面14aとの交差する部位が面取りされた形状やアール形状であってもよい。 The wall engaging portion 15a may not have an inclined surface and may be formed to be orthogonal to the inner surface 14a and the outer surface 14c of the lid 14. Alternatively, the wall engaging portion 15a may have a shape that has a surface orthogonal to the inner surface 14a and the outer surface 14c of the lid 14 and is chamfered at a portion that intersects the inner surface 14a.
または、壁部用係合部15aは、傾斜面を有しているのではなく、緩やかに湾曲する面を有していてもよい。
この場合、第2係合部52b,60bは傾斜面を有していてもよいし、傾斜面を有していなくてもよい。例えば、係合突部52a,60aが、正極端子カバー50及び負極端子カバー58の軸方向に沿って延びる鉛直面を有し、かつ鉛直面に直交する係合突部52a,60aの先端面を有し、鉛直面と先端面とが交差する部位に面取り部やアール部を有していてもよい。
Alternatively, the wall engaging portion 15a may have a gently curved surface instead of an inclined surface.
In this case, the second engaging portions 52b and 60b may have an inclined surface or may not have an inclined surface. For example, the engagement protrusions 52a and 60a have vertical surfaces extending along the axial direction of the positive electrode terminal cover 50 and the negative electrode terminal cover 58, and the front end surfaces of the engagement protrusions 52a and 60a orthogonal to the vertical surfaces. And a chamfered portion or a rounded portion may be provided at a portion where the vertical surface and the tip surface intersect.
○ 第1係合部51b,59b、及び第2係合部52b,60bの数は適宜変更してもよいし、壁部用係合部15aの数も適宜変更してもよい。
○ 壁部用係合部15aを蓋14の長手方向に延びるように形成したが、壁部用係合部15aを蓋14の短手方向に延びるように形成してもよい。
The number of the first engaging portions 51b and 59b and the second engaging portions 52b and 60b may be changed as appropriate, and the number of the wall engaging portions 15a may be changed as appropriate.
Although the wall engaging portion 15a is formed to extend in the longitudinal direction of the lid 14, the wall engaging portion 15a may be formed to extend in the short direction of the lid 14.
○ 実施形態では、ケース12の壁部を蓋14に具体化したが、ケース本体13の側壁又は底壁をケース12の壁部としてもよい。
○ 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。
In the embodiment, the wall portion of the case 12 is embodied as the lid 14, but the side wall or the bottom wall of the case body 13 may be the wall portion of the case 12.
The number of the positive electrode 21 and the negative electrode 22 which comprise the electrode assembly 20 may be changed suitably.
○ 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。
○ 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 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.
The present invention may be embodied as a nickel hydride secondary battery as an electricity storage device or an electric double layer capacitor.
10…蓄電装置としての二次電池、12…ケース、14…壁部としての蓋、14b…挿通孔、14c…外面、15a…壁部用係合部、20…電極組立体、33…導線部材としての正極導電部材、37…導電部材としての負極導電部材、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…基部としての正極基部、44…極柱部としての正極柱部、44a,54a…雄ねじ部、44b,54b…雌ねじ部、48…治具、50…正極端子カバー、51b,59b…第1係合部、52b,60b…第2係合部、53…基部としての負極基部、54…極柱部としての負極柱部、55…ナット、57…治具用係合部、58…負極端子カバー、62…電流遮断装置、70…導通部材、71…接続部材。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery as a power storage device, 12 ... Case, 14 ... Lid as wall part, 14b ... Insertion hole, 14c ... Outer surface, 15a ... Engagement part for wall part, 20 ... Electrode assembly, 33 ... Conductive member Positive electrode conductive member as 37, negative electrode conductive member as conductive member, 41 ... positive electrode terminal as electrode terminal, 42 ... negative electrode terminal as electrode terminal, 43 ... positive electrode base as base, 44 ... positive electrode as pole column Column part, 44a, 54a ... male screw part, 44b, 54b ... female screw part, 48 ... jig, 50 ... positive electrode terminal cover, 51b, 59b ... first engagement part, 52b, 60b ... second engagement part, 53 ... Negative electrode base as base, 54 ... Negative pole column as pole post, 55 ... Nut, 57 ... Jig engagement part, 58 ... Negative terminal cover, 62 ... Current interrupt device, 70 ... Conductive member, 71 ... Connection Element.
Claims (5)
前記蓄電装置同士の接続のため、前記極柱部に導通部材を接続する際には、前記極柱部が備える雌ねじ部に接続部材が螺合されるとともに、前記ナットを前記雄ねじ部に螺合する際には前記電極端子を回り止めする治具が用いられ、
前記電極端子は、前記治具が係合する治具用係合部を有し、
前記端子カバーは、前記基部に係合する第1係合部及び前記壁部に係合する第2係合部を有し、
前記壁部は、前記第2係合部が係合する壁部用係合部を有する蓄電装置。 An electrode assembly in the case, a conductive member connected to the electrode assembly, a pole column connected to the conductive member and projecting out of the case from an insertion hole in the wall of the case, and inside the case An electrode terminal that is positioned and has a base portion integral with an end portion of the pole column portion, a nut that is screwed to a male screw portion on the outer peripheral surface of the pole column portion, and a terminal that insulates the wall portion and the base portion A power storage device having a cover,
When connecting a conductive member to the pole column portion for connecting the power storage devices, a connection member is screwed into a female screw portion included in the pole column portion, and the nut is screwed into the male screw portion. When doing so, a jig to stop the electrode terminal is used,
The electrode terminal has a jig engaging portion with which the jig is engaged,
The terminal cover has a first engagement portion that engages with the base portion and a second engagement portion that engages with the wall portion,
The power storage device, wherein the wall portion includes a wall engaging portion with which the second engaging portion is engaged.
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