JP2015022987A - Power storage device, and method of manufacturing the same - Google Patents
Power storage device, and method of manufacturing the same Download PDFInfo
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- JP2015022987A JP2015022987A JP2013152708A JP2013152708A JP2015022987A JP 2015022987 A JP2015022987 A JP 2015022987A JP 2013152708 A JP2013152708 A JP 2013152708A JP 2013152708 A JP2013152708 A JP 2013152708A JP 2015022987 A JP2015022987 A JP 2015022987A
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- 238000003860 storage Methods 0.000 title claims abstract description 68
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000003780 insertion Methods 0.000 claims abstract description 99
- 230000037431 insertion Effects 0.000 claims abstract description 99
- 230000002093 peripheral effect Effects 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 26
- 238000003825 pressing Methods 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 239000011888 foil Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000001217 buttock Anatomy 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229910000652 nickel hydride Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 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
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
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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
- Y02E60/10—Energy storage using batteries
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- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
Description
本発明は、電極端子がケースの壁部に締結固定されている蓄電装置、及び同蓄電装置の製造方法に関するものである。 The present invention relates to a power storage device in which an electrode terminal is fastened and fixed to a wall portion of a case, and a method for manufacturing the power storage device.
EV(Electric Vehicle)やPHV(Plug in Hybrid Vehicle)などの車両には、原動機となる電動機への供給電力を蓄える蓄電装置としてリチウムイオン電池などの二次電池が搭載されている。この種の二次電池は、例えば、特許文献1に開示されている。 A vehicle such as an EV (Electric Vehicle) or a PHV (Plug in Hybrid Vehicle) is equipped with a secondary battery such as a lithium ion battery as a power storage device that stores power supplied to an electric motor serving as a prime mover. This type of secondary battery is disclosed in Patent Document 1, for example.
図21に示すように、特許文献1の二次電池は、円筒状のケース201内に電極組立体202を捲回させた状態で収容している。この電極組立体202は、正極電極203と負極電極204の間にセパレータ205を介在させた層状になっている。そして、正極電極203及び負極電極204からはタブ206がそれぞれ引き出され、同極のタブ206が複数集められて電極端子207に接続されている。なお、図21では、複数のタブ206のうちで、一部のタブ206と電極端子207とが接続した状態を示しており、その他のタブ206と電極端子207とが接続した状態は図示を省略している。 As shown in FIG. 21, the secondary battery of Patent Document 1 is housed in a state where the electrode assembly 202 is wound in a cylindrical case 201. The electrode assembly 202 has a layered structure in which a separator 205 is interposed between a positive electrode 203 and a negative electrode 204. Tabs 206 are drawn out from the positive electrode 203 and the negative electrode 204, and a plurality of tabs 206 having the same polarity are collected and connected to the electrode terminal 207. FIG. 21 shows a state in which some of the tabs 206 are connected to some of the tabs 206 and the electrode terminals 207, and other tabs 206 and the electrode terminals 207 are not shown. doing.
電極端子207は、鍔部208と同鍔部208から突出して形成された極柱部209とを有し、極柱部209はその外周面の全体に雄ねじが形成されている。この電極端子207は、極柱部209がケース201の挿通孔210に挿通した状態であり且つ極柱部209の先端が同ケース201外部に突出した状態でケース201に取り付けられている。 The electrode terminal 207 has a flange portion 208 and a pole column portion 209 formed so as to protrude from the flange portion 208, and the pole column portion 209 has a male screw formed on the entire outer peripheral surface thereof. The electrode terminal 207 is attached to the case 201 in a state where the pole column portion 209 is inserted into the insertion hole 210 of the case 201 and the tip end of the pole column portion 209 protrudes outside the case 201.
ケース201の挿通孔210には、電気絶縁性を有する材料(例えばポリプロピレン)により形成された絶縁部材211が取着されている。特許文献1に記載の二次電池では、この絶縁部材211が、ケース201と電極端子207との間を電気的に絶縁するための部材として機能するほか、ケース201と電極端子207との間をシールするためのシール部材としても機能する。 An insulating member 211 made of an electrically insulating material (for example, polypropylene) is attached to the insertion hole 210 of the case 201. In the secondary battery described in Patent Document 1, the insulating member 211 functions as a member for electrically insulating the case 201 and the electrode terminal 207, and between the case 201 and the electrode terminal 207. It also functions as a sealing member for sealing.
そして、電極端子207の極柱部209には、ケース201の外側から、第1ナット213及び第2ナット214が螺合されている。ワッシャ212を介して第1ナット213を締付けることにより、電極端子207の鍔部208とワッシャ212とによって絶縁部材211が狭持されて同絶縁部材211のシール性が高められている。なお、第2ナット214は、例えば第2ナット214を締付けることによって第1ナット213と第2ナット214との間にバスバー等を挟持するといったように、外部回路との接続に利用される。 A first nut 213 and a second nut 214 are screwed into the pole column portion 209 of the electrode terminal 207 from the outside of the case 201. By tightening the first nut 213 via the washer 212, the insulating member 211 is held between the flange 208 of the electrode terminal 207 and the washer 212, and the sealing performance of the insulating member 211 is enhanced. The second nut 214 is used for connection to an external circuit, for example, by clamping the second nut 214 to hold a bus bar or the like between the first nut 213 and the second nut 214.
ところで、特許文献1の二次電池では、第1ナット213や第2ナット214を極柱部209の雄ねじに螺合して締付ける際に、その締付けトルクによっては、電極端子207が第1ナット213や第2ナット214とともに回転する現象、いわゆる連れ回りが生じてしまうおそれがある。この場合、電極端子207とタブ206との接続部分の内部応力が大きくなるため、同部分の破断を招くなど、種々の不都合を招くおそれがある。 By the way, in the secondary battery of Patent Document 1, when the first nut 213 or the second nut 214 is screwed into the male screw of the pole post 209 and tightened, the electrode terminal 207 may be connected to the first nut 213 depending on the tightening torque. There is a possibility that a phenomenon of rotating together with the second nut 214, that is, a so-called rotation will occur. In this case, since the internal stress of the connection portion between the electrode terminal 207 and the tab 206 is increased, there is a possibility that various inconveniences such as breakage of the same portion may be caused.
この発明は、上記従来技術に存在する問題点に着目してなされたものであり、その目的は、電極端子へのナットやボルトの螺合に際して同電極端子の連れ回りを抑えることができる蓄電装置、及び同蓄電装置の製造方法を提供することにある。 The present invention has been made paying attention to the problems existing in the above-described prior art, and the purpose thereof is a power storage device capable of suppressing the rotation of the electrode terminal when the nut or bolt is screwed to the electrode terminal. And providing a method of manufacturing the same power storage device.
以下、上記課題を達成するための蓄電装置は、内部と外部とを連通する挿通孔が形成されたケースと、少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、前記極柱部に締結される締結部材と、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材とを有する蓄電装置であって、当該蓄電装置は、前記締結部材と前記鍔部との間で、前記ケースと前記電極端子とが前記介設部材を挟持させた状態で締結固定される締結固定構造と、前記介設部材を挟持させた部分において前記ケースと前記介設部材と前記電極端子との相対移動を抑える移動抑制構造と、を有することを要旨とする。 Hereinafter, a power storage device for achieving the above-described object includes a case in which an insertion hole that communicates the inside and the outside is formed, and a pole that includes at least a part having a dimension larger than the inner diameter of the insertion hole. It has a column part, is a state where the collar part is arranged in the case, and is a state where the pole column part is inserted through the insertion hole, and a tip of the pole column part protrudes outside the case At least a portion is disposed between the electrode terminal provided in the case in a state, a fastening member fastened to the pole column portion, and a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal. An electrical storage device having an interposed member, wherein the electrical storage device is fastened and fixed between the fastening member and the flange with the case and the electrode terminal sandwiching the interposed member. The fastening and fixing structure and the interposed member are clamped A movement restraining structure to suppress the relative movement between the electrode terminal and the interposition member and the case in so portions, and summarized in that with.
上記蓄電装置によれば、ケースにおける挿通孔の周縁と電極端子の鍔部とによって介設部材が挟持された部分が、それらケース、介設部材および電極端子の相対移動を抑える移動抑制構造になっているため、電極端子へのナットやボルトの螺合に際して、ナットやボルトと共に電極端子がケースに対して相対回転することを抑えることができる。 According to the power storage device, the portion where the interposed member is sandwiched between the peripheral edge of the insertion hole and the flange portion of the electrode terminal in the case has a movement suppressing structure that suppresses relative movement of the case, the interposed member, and the electrode terminal. Therefore, when the nut or bolt is screwed onto the electrode terminal, the electrode terminal can be prevented from rotating relative to the case together with the nut or bolt.
上記課題を達成するための蓄電装置は、内部と外部とを連通する挿通孔が形成されたケースと、少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、前記極柱部に締結される締結部材と、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材とを有する蓄電装置であって、当該蓄電装置は、前記締結部材と前記鍔部との間で、前記ケースと前記鍔部とが前記介設部材を挟持させた状態で締結固定される締結固定構造を有し、前記介設部材を挟持させる部分において、前記ケースにおける前記介設部材との接触面は凹部を有し、前記電極端子の前記鍔部における前記介設部材との接触面は凹部を有し、前記介設部材の前記ケースとの接触面および前記鍔部との接触面は凸部を有しない形状に形成されていることを要旨とする。 A power storage device for achieving the above object includes a case in which an insertion hole that communicates the inside and the outside is formed, and a pole column portion that includes a flange portion that is at least partially larger than the inner diameter of the insertion hole. In the state where the collar portion is disposed in the case, the pole column portion is inserted through the insertion hole, and the tip of the pole column portion protrudes outside the case. An electrode terminal provided in the case, a fastening member fastened to the pole column part, and an interposition in which at least a part is disposed between a peripheral edge of the insertion hole in the case and the flange part of the electrode terminal A power storage device having a member, wherein the power storage device is fastened and fixed between the fastening member and the flange portion in a state where the case and the flange portion sandwich the interposed member. It has a fixing structure and clamps the interposed member The contact surface of the case with the interposed member has a recess, the contact surface of the electrode terminal with the interposed member has a recess, and the case of the interposed member The contact surface of this and the contact surface with the said collar part make it a summary to be formed in the shape which does not have a convex part.
上記蓄電装置では、電極端子の極柱部への締結部材の締結を通じてケースにおける挿通孔の周縁と電極端子の鍔部との間で介設部材を挟持させる過程で、ケースと介設部材との接触面の面圧や電極端子と介設部材との接触面の面圧が高くなる。そのため、ケースと介設部材との接触面において同介設部材における上記ケースの凹部に対向する部分が隆起するように同介設部材を変形させることができる。また、電極端子と介設部材との接触面において同介設部材における上記電極端子の凹部に対向する部分が隆起するように同介設部材を変形させることもできる。 In the power storage device, in the process of sandwiching the interposed member between the periphery of the insertion hole in the case and the flange of the electrode terminal through the fastening of the fastening member to the pole portion of the electrode terminal, The surface pressure of the contact surface and the surface pressure of the contact surface between the electrode terminal and the interposed member are increased. Therefore, the interposition member can be deformed so that a portion of the interposition member facing the concave portion of the case rises on the contact surface between the case and the interposition member. Further, the interposition member can be deformed so that a portion of the interposition member facing the concave portion of the electrode terminal rises on the contact surface between the electrode terminal and the interposition member.
このように上記蓄電装置によれば、電極端子への締結部材の締結に際して、介設部材の表面形状をケースの凹部や電極端子の凹部に係合する形状に変形させることができる。そのため、介設部材とケースの凹部との係合や電極端子の凹部と介設部材との係合を通じて、ケースと電極端子との相対回転を抑えることができる。したがって、電極端子へのナットやボルトの螺合に際して、ナットやボルトと共に電極端子がケースに対して相対回転することを抑えることができる。 As described above, according to the power storage device, when the fastening member is fastened to the electrode terminal, the surface shape of the interposed member can be changed to a shape that engages with the concave portion of the case or the concave portion of the electrode terminal. Therefore, the relative rotation between the case and the electrode terminal can be suppressed through the engagement between the interposed member and the concave portion of the case or the engagement between the concave portion of the electrode terminal and the interposed member. Therefore, when the nut or bolt is screwed onto the electrode terminal, the electrode terminal can be prevented from rotating relative to the case together with the nut or bolt.
上記蓄電装置において、前記極柱部は外面に雄ねじを有するものとし、前記締結部材は前記雄ねじに螺合されているものとすることができる。
上記蓄電装置において、前記ケースの凹部と前記電極端子の凹部とは前記締結部材を螺合する方向において重ならない位置に形成されていることが好ましい。
In the above power storage device, the pole column portion may have a male screw on an outer surface, and the fastening member may be screwed into the male screw.
In the above power storage device, it is preferable that the concave portion of the case and the concave portion of the electrode terminal are formed at positions that do not overlap in a direction in which the fastening member is screwed.
ケースの凹部と電極端子の凹部とを締結部材の螺合方向において重なる位置に形成すると、それら凹部の形成位置において、ケースと電極端子とによって介設部材を狭圧する力が、介設部材の両接触面をそれぞれ凹部内に向けて隆起させるように作用する。そのため電極端子の雄ねじに締結部材を螺合させる際に、介設部材の両接触面を変形させる力が小さくなり易く、その変形が適正に行われなくなるおそれがある。 When the concave portion of the case and the concave portion of the electrode terminal are formed at positions where they overlap each other in the screwing direction of the fastening member, the force that narrows the interposed member by the case and the electrode terminal at the position where these concave portions are formed is The contact surfaces act so as to protrude toward the recesses. Therefore, when the fastening member is screwed onto the male screw of the electrode terminal, the force that deforms both contact surfaces of the interposed member is likely to be small, and the deformation may not be performed properly.
上記蓄電装置によれば、ケースの凹部と電極端子の凹部とが締結部材を螺合させる方向において重ならない位置に形成される。そのため、ケースと電極端子とによって介設部材を挟持させる部分において、介設部材の両接触面の一方の全体を凹部の無い面によって支持した状態で、両接触面の他方を凹部の有る面によって押圧することができる。したがって、ケースと電極端子とによって介設部材を狭圧する力を同介設部材の両接触面のうちの一方の面のみを隆起させるように作用させることができ、介設部材の一部を凹部内に向けて適正に隆起させることができる。 According to the power storage device, the recess of the case and the recess of the electrode terminal are formed at positions that do not overlap in the direction in which the fastening member is screwed. Therefore, in the portion where the interposed member is sandwiched between the case and the electrode terminal, one of the contact surfaces of the interposed member is supported by the surface without the recess, and the other of the contact surfaces is the surface with the recess. Can be pressed. Therefore, the force for constricting the interposed member by the case and the electrode terminal can be applied so that only one of the contact surfaces of the interposed member is raised, and a part of the interposed member is recessed. It can be raised properly inward.
前記ケースの凹部は、前記締結部材の回転軸と直交する方向に延設されていることが好ましい。
上記蓄電装置において、電極端子に締結部材を螺合させるときには、ケースの凹部と介設部材の変形部分とが係合する部分に、同締結部材の螺合方向における回転軸を中心とする円周方向の力が作用する。上記蓄電装置によれば、ケースの凹部が、締結部材の回転軸と直交する方向、すなわち同凹部と介設部材の変形部分とが係合する部分に作用する円周方向の力と直交する方向に延設される。そのため、ケースの凹部と介設部材の変形部分とが係合する力を効率よく利用して、ケースと介設部材の相対回転を好適に抑えることができる。
It is preferable that the concave portion of the case is extended in a direction orthogonal to the rotation axis of the fastening member.
In the power storage device, when the fastening member is screwed to the electrode terminal, the circumference centered on the rotation axis in the screwing direction of the fastening member is engaged with the portion where the concave portion of the case and the deformed portion of the interposed member are engaged. Directional force acts. According to the power storage device described above, the concave portion of the case is perpendicular to the rotational force of the fastening member, that is, the direction perpendicular to the circumferential force acting on the portion where the concave portion and the deformed portion of the interposed member are engaged. It is extended to. Therefore, the relative rotation between the case and the interposed member can be suitably suppressed by efficiently using the force with which the concave portion of the case engages with the deformed portion of the interposed member.
また、前記電極端子の凹部は、前記締結部材の回転軸と直交する方向に延設されていることが好ましい。
上記蓄電装置において、電極端子に締結部材を螺合させるときには、電極端子の凹部と介設部材の変形部分とが係合する部分に、同締結部材の螺合方向における回転軸を中心とする円周方向の力が作用する。上記蓄電装置によれば、電極端子の凹部が、締結部材の回転軸と直交する方向、すなわち同凹部と介設部材の変形部分とが係合する部分に作用する円周方向の力と直交する方向に延設される。そのため、電極端子の凹部と介設部材の変形部分とが係合する力を効率よく利用して、電極端子と介設部材の相対回転を好適に抑えることができる。
Moreover, it is preferable that the recessed part of the said electrode terminal is extended in the direction orthogonal to the rotating shaft of the said fastening member.
In the above power storage device, when the fastening member is screwed to the electrode terminal, a circle centering on the rotation axis in the screwing direction of the fastening member is engaged with a portion where the concave portion of the electrode terminal engages with the deformed portion of the interposed member. A circumferential force is applied. According to the power storage device, the concave portion of the electrode terminal is orthogonal to the circumferential force acting on the direction orthogonal to the rotation axis of the fastening member, that is, the portion where the concave portion and the deformed portion of the interposed member are engaged. It extends in the direction. Therefore, the relative rotation between the electrode terminal and the interposed member can be suitably suppressed by efficiently using the force with which the concave portion of the electrode terminal engages with the deformed portion of the interposed member.
前記ケースおよび前記電極端子は、前記介設部材と比較して硬度の高い材料により形成されていることが好ましい。
上記蓄電装置によれば、ケースと電極端子とによって介設部材を挟持させるときに、ケースや電極端子の不要な変形を抑えつつ、介設部材をケースの凹部内や電極端子の凹部内に隆起させる態様で好適に変形させることができる。
It is preferable that the case and the electrode terminal are formed of a material having a higher hardness than the interposed member.
According to the power storage device, when the interposed member is sandwiched between the case and the electrode terminal, the interposed member is raised in the recessed portion of the case or the recessed portion of the electrode terminal while suppressing unnecessary deformation of the case and the electrode terminal. Thus, it can be suitably deformed.
上記課題を達成するための蓄電装置は、内部と外部とを連通する挿通孔が形成されたケースと、少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、前記極柱部に締結される締結部材と、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材とを有する蓄電装置であって、当該蓄電装置は、前記締結部材と前記鍔部との間で、前記ケースと前記鍔部とが前記介設部材を挟持させた状態で締結固定される締結固定構造を有し、前記ケース、前記介設部材、前記電極端子の順に硬度が変化する態様で、それら前記ケース、前記介設部材及び前記電極端子の形成材料が定められており、前記ケースと前記介設部材との接触部分、及び前記介設部材と前記電極端子との接触部分において、前記形成材料の硬度が高いほうの部材は凸部を有することを要旨とする。 A power storage device for achieving the above object includes a case in which an insertion hole that communicates the inside and the outside is formed, and a pole column portion that includes a flange portion that is at least partially larger than the inner diameter of the insertion hole. In the state where the collar portion is disposed in the case, the pole column portion is inserted through the insertion hole, and the tip of the pole column portion protrudes outside the case. An electrode terminal provided in the case, a fastening member fastened to the pole column part, and an interposition in which at least a part is disposed between a peripheral edge of the insertion hole in the case and the flange part of the electrode terminal A power storage device having a member, wherein the power storage device is fastened and fixed between the fastening member and the flange portion in a state where the case and the flange portion sandwich the interposed member. The case has a fixing structure, and the case and the interposition member The case, the interposed member, and the material for forming the electrode terminal are defined in such a manner that the hardness changes in the order of the electrode terminal, the contact portion between the case and the interposed member, and the interposed member In the contact portion between the electrode terminal and the electrode terminal, the member having the higher hardness of the forming material has a convex portion.
上記蓄電装置では、電極端子への締結部材の締結を通じてケースにおける挿通孔の周縁と電極端子の鍔部との間で介設部材を挟持させる過程で、ケースと介設部材との接触部分や介設部材と電極端子との接触部分において、硬度が高いほうの部材に設けられた凸部が硬度が低いほうの部材の表面に刺さる。これによりケースと介設部材とを係合させることができ、また介設部材と電極端子とを係合させることができる。上記蓄電装置によれば、それらの係合を通じてケースと電極端子との相対回転を抑えることができるため、電極端子へのナットやボルトの螺合に際して、ナットやボルトと共に電極端子がケースに対して相対回転することを抑えることができる。 In the power storage device, in the process of clamping the interposed member between the periphery of the insertion hole in the case and the flange of the electrode terminal through the fastening of the fastening member to the electrode terminal, the contact portion or the intermediate portion between the case and the interposed member At the contact portion between the installation member and the electrode terminal, the convex portion provided on the member having higher hardness pierces the surface of the member having lower hardness. Thereby, the case and the interposed member can be engaged, and the interposed member and the electrode terminal can be engaged. According to the power storage device, the relative rotation between the case and the electrode terminal can be suppressed through the engagement thereof. Therefore, when the nut or the bolt is screwed to the electrode terminal, the electrode terminal is attached to the case together with the nut or the bolt. Relative rotation can be suppressed.
上記蓄電装置において、前記ケース、前記介設部材、前記電極端子の順に形成材料の硬度が高くなり、前記ケースと前記介設部材との接触部分では同介設部材が凸部を有し、前記介設部材と前記電極端子との接触部分では同電極端子が凸部を有する、といった構成を採用することができる。 In the power storage device, the hardness of the forming material increases in the order of the case, the interposed member, and the electrode terminal, and the interposed member has a convex portion at a contact portion between the case and the interposed member, A configuration in which the electrode terminal has a convex portion at the contact portion between the interposed member and the electrode terminal can be employed.
上記蓄電装置によれば、ケースと電極端子との間で介設部材を挟持させる過程で、電極端子の凸部が介設部材に刺さるとともに同介設部材の凸部がケースに刺さるため、ケースと介設部材と電極端子とを係合させることができる。 According to the power storage device, in the process of sandwiching the interposed member between the case and the electrode terminal, the convex portion of the electrode terminal is stuck in the interposed member and the convex portion of the interposed member is stuck in the case. And the interposition member and the electrode terminal can be engaged with each other.
前記凸部は、先鋭形状に形成されていることが好ましい。
上記蓄電装置によれば、ケースと電極端子との間で介設部材を挟持させるときに、対向する部材に凸部が好適に刺さるようになる。
It is preferable that the convex portion is formed in a sharp shape.
According to the power storage device, when the interposed member is sandwiched between the case and the electrode terminal, the convex portion is suitably stuck in the opposing member.
上記蓄電装置において、前記極柱部は外面に雄ねじを有するものとし、前記締結部材は前記雄ねじに螺合されているものとすることができる。
上記蓄電装置において、前記締結部材と前記ケースとの間に押圧部材が挟持されており、同押圧部材が前記ケースに接触している部分と前記介設部材を挟持させた部分とが、前記締結部材を前記極柱部に締結する方向においてオーバーラップしていることが好ましい。
In the above power storage device, the pole column portion may have a male screw on an outer surface, and the fastening member may be screwed into the male screw.
In the power storage device, a pressing member is sandwiched between the fastening member and the case, and a portion where the pressing member is in contact with the case and a portion where the interposed member is sandwiched are It is preferable that the members overlap each other in the direction in which the member is fastened to the pole column.
上記蓄電装置において、押圧部材がケースに接触している部分と介設部材を挟持させた部分とが締結部材の締結方向においてオーバーラップしていないと仮定した場合、電極端子への締結部材の締結に際して、ケースと電極端子とによって介設部材を挟持している部分を押圧部材によって締結方向から押さえることができない。そのため、上記介設部材を挟持している部分が不要に撓むなどして、ケースと介設部材との接触面の面圧や電極端子と介設部材との接触面の面圧が不要に低くなって、ケースと介設部材と電極端子との相対移動を抑える効果の低下を招くおそれがある。 In the power storage device, when it is assumed that the portion where the pressing member is in contact with the case and the portion where the interposed member is sandwiched do not overlap in the fastening direction of the fastening member, the fastening member is fastened to the electrode terminal. At this time, the portion holding the interposed member between the case and the electrode terminal cannot be pressed from the fastening direction by the pressing member. Therefore, the surface pressure of the contact surface between the case and the interposed member and the surface pressure of the contact surface between the electrode terminal and the interposed member are unnecessary because the portion holding the interposed member bends unnecessarily. It may become low and may cause the fall of the effect which suppresses relative movement with a case, an interposed member, and an electrode terminal.
上記蓄電装置によれば、押圧部材がケースに接触している部分と前記介設部材を挟持させた部分とが締結部材の締結方向においてオーバーラップしているため、電極端子への締結部材の締結に際して、ケースと電極端子とによって介設部材を挟持させる部分を押圧部材によって締結方向から押圧することができる。そのため、ケースと介設部材との接触面の面圧や電極端子と介設部材との接触面の面圧が不要に低くなることを抑えることができ、ケースと介設部材と電極端子との相対移動を好適に抑えることができる。 According to the power storage device, since the portion where the pressing member is in contact with the case and the portion where the interposed member is sandwiched overlap in the fastening direction of the fastening member, the fastening member is fastened to the electrode terminal. At this time, a portion that sandwiches the interposed member between the case and the electrode terminal can be pressed from the fastening direction by the pressing member. Therefore, it is possible to suppress the surface pressure of the contact surface between the case and the interposed member and the surface pressure of the contact surface between the electrode terminal and the interposed member from being unnecessarily lowered. Relative movement can be suitably suppressed.
上記蓄電装置は、前記締結する方向において、前記介設部材を挟持させた部分の全体を前記押圧部材が前記ケースに接触している部分とオーバーラップさせることができる。
上記蓄電装置によれば、前記介設部材を挟持させた部分の全体を押圧部材によって締結方向から押圧することができるため、同部分の撓みを抑えることができ、ケースと介設部材との接触面の面圧や電極端子と介設部材との接触面の面圧が不要に低くなることを確実に抑えることができる。
In the power storage device, the entire portion where the interposed member is clamped can overlap the portion where the pressing member is in contact with the case in the fastening direction.
According to the power storage device, since the entire portion sandwiching the interposed member can be pressed from the fastening direction by the pressing member, the bending of the portion can be suppressed, and the contact between the case and the interposed member It is possible to reliably suppress the surface pressure of the surface and the surface pressure of the contact surface between the electrode terminal and the interposed member from becoming unnecessarily low.
上記課題を達成するための蓄電装置の製造方法は、内部と外部とを連通する挿通孔が形成されたケースと、少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、前記極柱部に締結される締結部材と、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材とを有する蓄電装置の製造方法であって、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に前記介設部材を挟持させる部分が、前記ケースと前記介設部材と前記電極端子との相対移動を抑える移動抑制構造を有し、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に介設部材を配置した状態で、前記締結部材を前記雄ねじに螺合して、前記ケースと前記電極端子とを締結固定する工程を含むことを要旨とする。 A method for manufacturing a power storage device for achieving the above-described object includes a case in which an insertion hole that communicates the inside and the outside is formed, and a flange portion that is at least partially larger than the inner diameter of the insertion hole. It has a pole column part, is a state where the collar part is arranged in the case, and is a state where the pole column part is inserted through the insertion hole, and the tip of the pole column part protrudes outside the case In this state, at least a part is disposed between the electrode terminal provided in the case, the fastening member fastened to the pole column part, and the periphery of the insertion hole in the case and the flange part of the electrode terminal. A part for sandwiching the interposed member between a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal. Between the interposed member and the electrode terminal. A movement suppressing structure that suppresses pair movement, and in a state where an interposed member is disposed between a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal, the fastening member is screwed into the male screw. The present invention includes a step of fastening and fixing the case and the electrode terminal.
上記製造方法によれば、電極端子の極柱部に締結部材を締結してケースと電極端子とを締結固定することにより、ケースにおける挿通孔の周縁と電極端子の鍔部とによって介設部材を挟持させることができる。そして、そのようにして介設部材を挟持させた部分によって、ケース、介設部材および電極端子の相対移動を抑えることができる。そのため、電極端子へのナットやボルトの螺合に際して、ナットやボルトと共に電極端子がケースに対して相対回転することを抑えることができる。 According to the manufacturing method described above, the fastening member is fastened to the pole portion of the electrode terminal and the case and the electrode terminal are fastened and fixed, whereby the interposed member is formed by the peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal. Can be pinched. And the relative movement of a case, an interposed member, and an electrode terminal can be suppressed by the part which clamped the interposed member in that way. Therefore, when the nut or the bolt is screwed onto the electrode terminal, the electrode terminal can be prevented from rotating relative to the case together with the nut or the bolt.
上記課題を達成するための蓄電装置の製造方法は、内部と外部とを連通する挿通孔が形成されたケースと、少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、前記極柱部に締結される締結部材と、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材と、を有する蓄電装置の製造方法であって、前記介設部材を挟持させる部分において、前記ケースにおける前記介設部材との接触面を凹部を有する形状に形成し、前記電極端子の前記鍔部における前記介設部材との接触面を凹部を有する形状に形成し、前記介設部材における前記ケースとの接触面および前記鍔部との接触面を前記ケースの凹部、及び前記鍔部の凹部に対向する場所に凸部を有しない形状に形成する第1工程と、同第1工程の後に、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に介設部材を配置した状態で、前記締結部材を前記雄ねじに螺合して、前記ケースと前記電極端子とを締結固定する第2工程とを含むことを要旨とする。 A method for manufacturing a power storage device for achieving the above-described object includes a case in which an insertion hole that communicates the inside and the outside is formed, and a flange portion that is at least partially larger than the inner diameter of the insertion hole. It has a pole column part, is a state where the collar part is arranged in the case, and is a state where the pole column part is inserted through the insertion hole, and the tip of the pole column part protrudes outside the case In this state, at least a part is disposed between the electrode terminal provided in the case, the fastening member fastened to the pole column part, and the periphery of the insertion hole in the case and the flange part of the electrode terminal. An electrode member, wherein a contact surface of the case with the interposed member is formed in a shape having a recess in a portion where the interposed member is sandwiched, and the electrode terminal In front of the buttocks The contact surface with the interposed member is formed in a shape having a recess, and the contact surface with the case and the contact surface with the flange portion of the interposed member are opposed to the recess portion of the case and the recess portion of the flange portion. A first step of forming a shape that does not have a convex portion at a location, and a state in which an interposed member is disposed between the peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal after the first step. Thus, the gist includes a second step of screwing the fastening member into the male screw to fasten and fix the case and the electrode terminal.
上記製造方法では、電極端子の極柱部に締結部材を締結してケースと電極端子とを締結固定する第2工程において、ケースにおける挿通孔の周縁と電極端子の鍔部との間で介設部材が挟持されるため、ケースと介設部材との接触面の面圧や電極端子と介設部材との接触面の面圧が高くなる。そのため、第1工程において介設部材における前記凹部に対向する場所に凸部が形成されないとはいえ、ケースと介設部材との接触面において同介設部材における上記ケースの凹部に対向する部分が隆起するように同介設部材を変形させることができる。また、電極端子と介設部材との接触面において同介設部材における上記電極端子の凹部に対向する部分が隆起するように同介設部材を変形させることもできる。 In the above manufacturing method, in the second step of fastening the fastening member to the pole portion of the electrode terminal to fasten and fix the case and the electrode terminal, it is interposed between the peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal. Since the member is sandwiched, the surface pressure of the contact surface between the case and the interposed member and the surface pressure of the contact surface between the electrode terminal and the interposed member are increased. Therefore, although a convex part is not formed in the place which opposes the said recessed part in an interposed member in a 1st process, the part facing the recessed part of the said case in the said interposed member in the contact surface of a case and an interposed member is The interposition member can be deformed so as to be raised. Further, the interposition member can be deformed so that a portion of the interposition member facing the concave portion of the electrode terminal rises on the contact surface between the electrode terminal and the interposition member.
このように上記製造方法によれば、電極端子の極柱部に締結部材を締結してケースと電極端子とを締結固定する第2工程において、介設部材の表面形状をケースの凹部や電極端子の凹部に係合する形状に変形させることができる。そのため、介設部材とケースの凹部との係合や電極端子の凹部と介設部材との係合を通じてケースと電極端子との相対回転を抑えることができる。したがって、電極端子へのナットやボルトの螺合に際して、ナットやボルトと共に電極端子がケースに対して相対回転することを抑えることができる。 As described above, according to the manufacturing method, in the second step of fastening the fastening member to the pole portion of the electrode terminal and fastening and fixing the case and the electrode terminal, the surface shape of the interposed member is changed to the concave portion of the case or the electrode terminal. It can be made to deform | transform into the shape engaged with the recessed part. Therefore, the relative rotation between the case and the electrode terminal can be suppressed through the engagement between the interposed member and the recessed portion of the case or the engagement between the recessed portion of the electrode terminal and the interposed member. Therefore, when the nut or bolt is screwed onto the electrode terminal, the electrode terminal can be prevented from rotating relative to the case together with the nut or bolt.
上記課題を達成するための蓄電装置の製造方法は、内部と外部とを連通する挿通孔が形成されたケースと、少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、前記極柱部に締結される締結部材と、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材と、を有する蓄電装置の製造方法であって、前記ケース、前記介設部材、前記電極端子の順に硬度が変化する態様で、それら前記ケース、前記介設部材及び前記電極端子の形成材料が定められており、前記ケースと前記介設部材との接触部分、及び前記介設部材と前記電極端子との接触部分において、前記形成材料の硬度が高いほうの部材を凸部を有する形状に形成し、前記形成材料の硬度が低いほうの部材を凹部を有しない形状に形成する前工程と、同前工程の後に、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に介設部材を配置した状態で、前記締結部材を前記極柱部に締結して、前記ケースと前記電極端子とを締結固定する後工程とを含むことを要旨とする。 A method for manufacturing a power storage device for achieving the above-described object includes a case in which an insertion hole that communicates the inside and the outside is formed, and a flange portion that is at least partially larger than the inner diameter of the insertion hole. It has a pole column part, is a state where the collar part is arranged in the case, and is a state where the pole column part is inserted through the insertion hole, and the tip of the pole column part protrudes outside the case In this state, at least a part is disposed between the electrode terminal provided in the case, the fastening member fastened to the pole column part, and the periphery of the insertion hole in the case and the flange part of the electrode terminal. An interposing member, wherein the hardness of the case, the interposing member, and the electrode terminal changes in the order of the case, the interposing member, and the electrode terminal. The forming material is determined In the contact portion between the case and the interposed member, and the contact portion between the interposed member and the electrode terminal, the member having a higher hardness of the forming material is formed into a shape having a convex portion, and the forming material A pre-process for forming the member having a lower hardness into a shape having no recess, and after the pre-process, an interposed member is provided between the periphery of the insertion hole in the case and the flange of the electrode terminal. The gist includes a post-process for fastening the fastening member to the pole column portion and fastening and fixing the case and the electrode terminal in the disposed state.
上記製造方法によれば、前工程において形成材料の硬度が低いほうの部材に凹部が形成されないとはいえ、電極端子の極柱部に締結部材を締結してケースと電極端子とを締結固定する後工程において、ケースと介設部材との接触部分や介設部材と電極端子との接触部分で、硬度が高いほうの部材に設けられた凸部が硬度が低いほうの部材の表面に刺さる。これによりケースと介設部材とを係合させることができ、また介設部材と電極端子とを係合させることができる。したがって、それらの係合を通じてケースと電極端子との相対回転を抑えることができるため、電極端子へのナットやボルトの螺合に際して、ナットやボルトと共に電極端子がケースに対して相対回転することを抑えることができる。 According to the above manufacturing method, the case and the electrode terminal are fastened and fixed by fastening the fastening member to the pole portion of the electrode terminal even though the recess is not formed in the member having the lower hardness of the forming material in the previous process. In the post-process, the convex portion provided on the member having higher hardness at the contact portion between the case and the interposed member or the contact portion between the interposed member and the electrode terminal pierces the surface of the member having the lower hardness. Thereby, the case and the interposed member can be engaged, and the interposed member and the electrode terminal can be engaged. Accordingly, since the relative rotation between the case and the electrode terminal can be suppressed through the engagement, the electrode terminal is rotated relative to the case together with the nut and the bolt when the nut or the bolt is screwed into the electrode terminal. Can be suppressed.
本発明によれば、電極端子へのナットやボルトの螺合に際して同電極端子の連れ回りを抑えることができる。 According to the present invention, the rotation of the electrode terminal can be suppressed when the nut or the bolt is screwed to the electrode terminal.
(第1の実施形態)
以下、蓄電装置を二次電池に具体化した第1の実施形態について説明する。
図1及び図2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とを備える。蓋14は、所定の間隔をあけて並設された一対の挿通孔14bを有し、本実施形態では、蓋14がケース12の壁部を構成している。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。
(First embodiment)
Hereinafter, a first embodiment in which the power storage device is embodied as a secondary battery will be described.
As shown in FIGS. 1 and 2, in the secondary battery 10, 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. With. The lid 14 has a pair of insertion holes 14b arranged in parallel at a predetermined interval. In the present embodiment, the lid 14 constitutes a wall portion of the case 12. 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3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. 3, 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 in a part of 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 part of one side direction (long side direction) of the negative electrode 22 is provided with a negative electrode current collecting tab 32 formed by extending the negative electrode metal foil 22a. 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.
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。 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 line 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.
図1に示すように、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の少なくとも最外の正極集電タブ31が、正極導電部材33に溶接されている。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の少なくとも最外の負極集電タブ32が負極導電部材37に溶接されている。 As shown in FIG. 1, the electrode assembly 20 includes 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 the positive electrode conductive member 33. The electrode assembly 20 includes 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 the negative electrode conductive member 37.
また、図1または図4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、後述の電極端子としての正極端子41または負極端子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から延びるタブ溶接部36を有している。なお、このタブ溶接部36は矩形板状である。 As shown in FIG. 1 or FIG. 4, 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 connecting portion 34, a surface to which a positive electrode terminal 41 or a negative electrode terminal 42 as an electrode terminal described later 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 34 b toward the first surface 34 a, and tab welding that extends from the rising portion 35 in a direction away from the terminal connection portion 34. A portion 36 is provided. The tab weld 36 is a rectangular plate.
正極導電部材33の端子接続部34には正極端子41が溶接されるとともに、負極導電部材37の端子接続部34には負極端子42が溶接されている。正極端子41及び負極端子42は、それぞれ八角板状をなす鍔部43を有するとともに、この鍔部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である。そして、鍔部43において、蓋14の内面14aに対向する面を座面43aとするとともに、鍔部43の厚み方向に座面43aと反対側の面を電極組立体側端面43bとする。 The positive electrode terminal 41 is welded to the terminal connection portion 34 of the positive electrode conductive member 33, and the negative electrode terminal 42 is welded to the terminal connection portion 34 of the negative electrode conductive member 37. The positive electrode terminal 41 and the negative electrode terminal 42 each have a flange portion 43 having an octagonal plate shape, and the planar shape of the flange portion 43 is substantially the same as the planar shape of the first surface 34 a in each terminal connection portion 34. In the collar portion 43, the surface facing the inner surface 14a of the lid 14 is a seat surface 43a, and the surface opposite to the seat surface 43a in the thickness direction of the collar portion 43 is an electrode assembly side end surface 43b.
鍔部43の中央からは円筒状の極柱部44が立設され、座面43aは極柱部44を取り囲んでいる。極柱部44は、外周面に雄ねじ44aを有するとともに、内周面にねじ溝としての雌ねじ44bを有する。雄ねじ44aと雌ねじ44bは逆ねじになっている。 A cylindrical pole post 44 is erected from the center of the flange 43, and a seating surface 43 a surrounds the pole post 44. The pole portion 44 has a male screw 44a on the outer peripheral surface and a female screw 44b as a screw groove on the inner peripheral surface. The male screw 44a and the female screw 44b are reverse screws.
鍔部43には、合成樹脂(例えば、ポリフェニレンサルファイド[PPS]、ポリプロピレン[PP])製の介設部材としての端子カバー50が装着されている。端子カバー50の一部分は、鍔部43の座面43aと蓋14の内面14aとの間に配置される蓋側絶縁板51である。蓋側絶縁板51は、極柱部44が挿入される挿入部51aを有し、蓋側絶縁板51の内周縁は円弧状である。また、蓋側絶縁板51は、挿入部51aを蓋側絶縁板51の一側方に開口させる切れ込み状の連通部51bを有し、挿入部51aと連通部51bによって蓋側絶縁板51は平面視U字状となっている。蓋側絶縁板51は、その内側縁に、連通部51bを挟んで対向し、かつ連通部51bに向けて突出する突部51cを有する。 A terminal cover 50 as an interposed member made of a synthetic resin (for example, polyphenylene sulfide [PPS] or polypropylene [PP]) is attached to the collar portion 43. A part of the terminal cover 50 is a lid-side insulating plate 51 disposed between the seating surface 43 a of the flange portion 43 and the inner surface 14 a of the lid 14. The lid-side insulating plate 51 has an insertion portion 51a into which the pole column portion 44 is inserted, and the inner peripheral edge of the lid-side insulating plate 51 is arcuate. The lid-side insulating plate 51 has a cut-out communication portion 51b that opens the insertion portion 51a to one side of the lid-side insulation plate 51. The lid-side insulation plate 51 is flat by the insertion portion 51a and the communication portion 51b. It has a U-shape. The lid-side insulating plate 51 has, on its inner edge, a protruding portion 51c that faces the communication portion 51b and protrudes toward the communication portion 51b.
また、端子カバー50の一部分は、蓋側絶縁板51の端縁のうち、挿入部51aを挟んだ連通部51bと反対側の端縁に配置されるケース側絶縁板52であり、このケース側絶縁板52は蓋14から離れる方向に向けて延びている。ケース側絶縁板52は矩形板状であり、蓋側絶縁板51に対し垂直に延びている。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、電極組立体側絶縁板53が蓋側絶縁板51と同じ方向に向けて、かつ電極組立体側端面43bに沿って延設されている。ケース側絶縁板52は矩形板状に形成されている。上記構成の端子カバー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。 Further, a part of the terminal cover 50 is a case-side insulating plate 52 that is disposed on the edge opposite to the communicating portion 51b across the insertion portion 51a among the edges of the lid-side insulating plate 51. The insulating plate 52 extends in a direction away from the lid 14. The case side insulating plate 52 has a rectangular plate shape and extends perpendicularly to the lid side insulating plate 51. In the case-side insulating plate 52, an electrode assembly-side insulating plate 53 extends in the same direction as the lid-side insulating plate 51 and extends along the electrode assembly-side end surface 43 b at the tip of the case-side insulating plate 52. Yes. The case side insulating plate 52 is formed in a rectangular plate shape. The terminal cover 50 configured as described above is attached to the positive terminal 41 and the negative terminal 42 from the side of the short side wall 13b of the case body 13.
蓋側絶縁板51の挿入部51aには極柱部44が挿入され、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は鍔部43の座面43a上に支持されている。鍔部43の座面43a上には、シール部材としてのOリング56が極柱部44を取り囲む状態で設けられている。Oリング56は、蓋側絶縁板51の挿入部51a内に配置されるとともに、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ている。電極組立体側絶縁板53は、鍔部43の電極組立体側端面43bより電極組立体20側に配置されるとともに、座面43aと反対側の電極組立体側端面43bに沿って延びている。また、電極組立体側絶縁板53は、鍔部43と電極組立体20との間に介装されている。 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 seating surface 43 a of the flange portion 43. An O-ring 56 as a seal member is provided on the seat surface 43 a of the flange 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 substantially entirely surrounded by the lid-side insulating plate 51. 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. The electrode assembly side insulating plate 53 is disposed closer to the electrode assembly 20 than the electrode assembly side end surface 43b of the flange portion 43, and extends along the electrode assembly side end surface 43b opposite to the seating surface 43a. The electrode assembly side insulating plate 53 is interposed between the flange 43 and the electrode assembly 20.
そして、端子カバー50における蓋側絶縁板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、電極組立体側絶縁板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。 The lid 14, the positive terminal 41, and the negative terminal 42 are electrically insulated by the lid-side insulating plate 51 in the terminal cover 50. 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 electrode assembly 20 is electrically insulated from the positive electrode terminal 41 and the negative electrode terminal 42 by the electrode assembly side insulating plate 53.
蓋側絶縁板51の挿入部51aに挿入された極柱部44は、蓋14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の鍔部43は、極柱部44の両端部のうちケース本体13内側に位置する端部に設けられている。また、鍔部43は、蓋14と平行な断面積が、挿通孔14bの開口面積よりも大きく設定されている。このため、鍔部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。蓋14の挿通孔14bの内周面と、極柱部44の外周面とは、絶縁部材19によって絶縁されている。 The pole part 44 inserted into the insertion part 51 a of the lid-side insulating plate 51 protrudes (exposes) from the insertion hole 14 b of the lid 14 to the outside of the case 12. The flange portions 43 of the positive electrode terminal 41 and the negative electrode terminal 42 are provided at end portions located inside the case main body 13 among both end portions of the pole column portion 44. Moreover, the collar part 43 is set so that the cross-sectional area parallel to the lid | cover 14 is larger than the opening area of the penetration hole 14b. For this reason, the collar part 43 cannot be pulled out from the insertion hole 14 b inside the case main body 13. The inner peripheral surface of the insertion hole 14 b of the lid 14 and the outer peripheral surface of the pole column portion 44 are insulated by the insulating member 19.
絶縁部材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、極柱部44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。 The insulating member 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 pole column portion 44. The flange portion 25 is provided around the insertion hole 14 b on the outer surface 14 c of the lid 14.
極柱部44の雄ねじ44aには締結部材としてのナット55が螺合されて、極柱部44にナット55が取着されている。
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絶縁部材19のフランジ部25が挟圧されており、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。ナット55が極柱部44に螺合されることによって、ナット55と鍔部43との間に、フランジ部25、蓋14、Oリング56及び蓋側絶縁板51が狭圧されるとともに極柱部44が蓋14に締結固定されている。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及び鍔部43の座面43aに密接し、挿通孔14bの周囲をシールしている。
A nut 55 as a fastening member is screwed to the male screw 44 a of the pole column portion 44, and the nut 55 is attached to the pole column portion 44.
The flange portion 25 of the insulating member 19 is sandwiched between the peripheral edge of the insertion hole 14b in the outer surface 14c of the lid 14 and the end surface of the nut 55 on the lid 14 side, and the nut 55 and the lid 14 are insulated by the flange portion 25. Has been. When the nut 55 is screwed into the pole portion 44, the flange portion 25, the lid 14, the O-ring 56, and the lid-side insulating plate 51 are narrowed between the nut 55 and the flange portion 43, and the pole column is provided. The part 44 is fastened and fixed to the lid 14. In this fastened state, the O-ring 56 is in close contact with the inner surface 14a of the lid 14 and the seating surface 43a of the flange portion 43, and seals the periphery of the insertion hole 14b.
図1に示すように、二次電池10同士を電気的に接続するバスバー60は、矩形板状であり、一対の挿通部60aを有する。バスバー60は、極柱部44の先端面に支持されている。極柱部44の雌ねじ44bには、ボルト61が螺合されている。よって、極柱部44の雌ねじ44bは、鍔部43とは反対側の端部に設けられており、この雌ねじ44bには、バスバー60を極柱部44に固定するボルト61が螺合される。ボルト61は、雌ねじ44bに螺合するボルトねじ部61aと、ボルトねじ部61aの軸方向一端の頭部61bとを有する。ボルト61の頭部61bによってバスバー60が極柱部44の先端面に押し当てられるとともに、極柱部44とバスバー60が導通している。 As shown in FIG. 1, the bus bar 60 that electrically connects the secondary batteries 10 has a rectangular plate shape and includes a pair of insertion portions 60 a. The bus bar 60 is supported on the distal end surface of the pole column portion 44. Bolts 61 are screwed into the female threads 44 b of the pole post 44. Therefore, the female screw 44b of the pole post 44 is provided at the end opposite to the flange 43, and a bolt 61 for fixing the bus bar 60 to the pole post 44 is screwed into the female screw 44b. . The bolt 61 has a bolt screw portion 61a that is screwed into the female screw 44b, and a head portion 61b at one end in the axial direction of the bolt screw portion 61a. The bus bar 60 is pressed against the distal end surface of the pole post 44 by the head 61b of the bolt 61, and the pole post 44 and the bus bar 60 are electrically connected.
次に、二次電池10におけるケース12と端子カバー50と電極端子(正極端子41または負極端子42)との相対移動を抑える移動抑制構造について説明する。
図5に示すように、ケース12の蓋14の内面14aにおける各挿通孔14bの周縁は複数の凹部14dを有する。これら凹部14dは、ナット55の回転軸Lと直交する方向に延設されており、等角度間隔で複数本(本実施形態では、45°間隔で8本)形成されている。
Next, a movement suppressing structure that suppresses relative movement among the case 12, the terminal cover 50, and the electrode terminal (the positive terminal 41 or the negative terminal 42) in the secondary battery 10 will be described.
As shown in FIG. 5, the periphery of each insertion hole 14b in the inner surface 14a of the lid 14 of the case 12 has a plurality of recesses 14d. The recesses 14d are extended in a direction perpendicular to the rotation axis L of the nut 55, and a plurality of the recesses 14d are formed at equiangular intervals (in this embodiment, eight at 45 ° intervals).
また図6に示すように、正極端子41の鍔部43の座面43aは複数の凹部43cを有する。これら凹部43cは、ナット55の回転軸Lと直交する方向に延設されており、等角度間隔で複数本(本実施形態では、45°間隔で8本)形成されている。なお、負極端子42の鍔部43の座面43aも同様に、複数の凹部43cを有する。 As shown in FIG. 6, the seating surface 43a of the flange 43 of the positive terminal 41 has a plurality of recesses 43c. These recesses 43c are extended in a direction orthogonal to the rotation axis L of the nut 55, and a plurality of recesses 43c are formed at equal angular intervals (in this embodiment, 8 at 45 ° intervals). Similarly, the seat surface 43a of the flange 43 of the negative electrode terminal 42 has a plurality of recesses 43c.
ケース12の凹部14dの形成位置(図6中に破線で示す)と電極端子(正極端子41または負極端子42)の凹部43cの形成位置(図6中に実線で示す)とはナット55を螺合する方向(図6の紙面に垂直な方向)において重ならない位置に形成されている。詳しくは、ケース12の凹部14dと電極端子の凹部43cとは、ナット55の螺合方向から見て、互いに等角度(22.5度)ずつずれた位置において延びる形状に形成されている。 The position at which the recess 14d of the case 12 is formed (shown by a broken line in FIG. 6) and the position at which the recess 43c of the electrode terminal (positive terminal 41 or negative terminal 42) is formed (shown by a solid line in FIG. 6) They are formed at positions that do not overlap in the direction of joining (the direction perpendicular to the paper surface of FIG. 6). Specifically, the concave portion 14d of the case 12 and the concave portion 43c of the electrode terminal are formed in a shape extending at a position shifted from each other by an equal angle (22.5 degrees) when viewed from the screwing direction of the nut 55.
図1または図4に示すように、端子カバー50の上記ケース12との接触面51d、及び正極端子41の鍔部43との接触面51eは、組み付け前において凸部を有しない平面形状に形成されている。なお、負極端子42に取り付けられる端子カバー50についても同様に、端子カバー50の各接触面51d,51eが、組み付け前において凸部を有しない平面形状に形成されている。 As shown in FIG. 1 or FIG. 4, the contact surface 51d of the terminal cover 50 with the case 12 and the contact surface 51e of the positive terminal 41 with the flange portion 43 are formed in a planar shape having no projection before assembly. Has been. Similarly, for the terminal cover 50 attached to the negative electrode terminal 42, the contact surfaces 51d and 51e of the terminal cover 50 are formed in a planar shape having no protrusions before assembly.
ケース12及び電極端子(正極端子41または負極端子42)は端子カバー50と比較して硬度の高い材料により形成されている。
本実施形態では、二次電池10の製造に際して、上述した形状でケース12の蓋14、端子カバー50、電極端子の鍔部43が形成される。本実施形態では、これらケース12の蓋14、端子カバー50、電極端子の鍔部43を形成する工程が第1工程になる。
The case 12 and the electrode terminal (the positive terminal 41 or the negative terminal 42) are formed of a material having higher hardness than the terminal cover 50.
In the present embodiment, when the secondary battery 10 is manufactured, the lid 14 of the case 12, the terminal cover 50, and the flange 43 of the electrode terminal are formed in the above-described shape. In the present embodiment, the process of forming the lid 14 of the case 12, the terminal cover 50, and the flange 43 of the electrode terminal is the first process.
そして、二次電池10を製造する際には、ケース12の蓋14における挿通孔14bの周縁と電極端子の鍔部43の座面43aとの間に端子カバー50の蓋側絶縁板51を配置した状態で、ナット55が電極端子の雄ねじ44aに螺合され、これによりケース12と電極端子とが締結固定される。本実施形態では、ケース12と電極端子とを締結固定する工程が、第2工程になる。 When the secondary battery 10 is manufactured, the lid-side insulating plate 51 of the terminal cover 50 is disposed between the peripheral edge of the insertion hole 14b in the lid 14 of the case 12 and the seating surface 43a of the flange 43 of the electrode terminal. In this state, the nut 55 is screwed into the male screw 44a of the electrode terminal, whereby the case 12 and the electrode terminal are fastened and fixed. In the present embodiment, the step of fastening and fixing the case 12 and the electrode terminal is the second step.
次に、二次電池10の作用について説明する。
二次電池10では、第2工程において、電極端子の雄ねじ44aにナット55を螺合してケース12と電極端子とを締結固定するときに、蓋14における挿通孔14bの周縁と電極端子の鍔部43との間で端子カバー50の蓋側絶縁板51が挟圧される。そのため、ケース12の接触面としての内面14aと端子カバー50の接触面51eとの面圧や電極端子の接触面としての座面43aと端子カバー50の接触面51eとの面圧が高くなる。
Next, the operation of the secondary battery 10 will be described.
In the secondary battery 10, in the second step, when the nut 55 is screwed onto the male screw 44a of the electrode terminal to fasten and fix the case 12 and the electrode terminal, the periphery of the insertion hole 14b in the lid 14 and the edge of the electrode terminal The lid-side insulating plate 51 of the terminal cover 50 is pinched with the portion 43. Therefore, the surface pressure between the inner surface 14a as the contact surface of the case 12 and the contact surface 51e of the terminal cover 50 and the surface pressure between the seat surface 43a as the contact surface of the electrode terminal and the contact surface 51e of the terminal cover 50 are increased.
これにより、図7に示すように、第1工程において端子カバー50の各接触面51d,51eに凹部14d,43cに係合する凸部が形成されていないとはいえ(図中の破線参照)、ケース12と端子カバー50との接触面51dにおいて端子カバー50における上記ケース12の凹部14dに対向する部分が隆起するように同端子カバー50を変形させることができる。しかも、第2工程においては、電極端子と端子カバー50との接触面51eにおいて同端子カバー50における上記電極端子の凹部43cに対向する部分が隆起するように同端子カバー50を変形させることもできる。なお、端子カバー50の隆起する部分はそれぞれ、対向する凹部14d,43cの内部において、曲率の低いなだらかな稜線を有する凸部になる。 As a result, as shown in FIG. 7, it can be said that the contact portions 51 d and 51 e of the terminal cover 50 are not formed with convex portions that engage with the concave portions 14 d and 43 c in the first step (see the broken line in the figure). The terminal cover 50 can be deformed so that a portion of the contact surface 51d between the case 12 and the terminal cover 50 that faces the concave portion 14d of the case 12 in the terminal cover 50 is raised. Moreover, in the second step, the terminal cover 50 can be deformed so that a portion of the contact surface 51e between the electrode terminal and the terminal cover 50 that protrudes from the electrode terminal recess 43c of the terminal cover 50 is raised. . Note that the protruding portions of the terminal cover 50 become convex portions having gentle ridge lines with low curvature in the concave portions 14d and 43c facing each other.
なお二次電池10の組み立て前における端子カバー50の接触面の形状を、ケース12の凹部14dに係合する凸部を有する形状にしたり、電極端子の凹部14dに係合する凸部を有する形状にしたりすることも考えられる。この場合、二次電池10の組み立て時に端子カバー50の凸部とケース12の凹部14dとを係合させたり、端子カバー50の凸部と電極端子の凹部14dとを係合させたりする必要があるため、その組み立て作業が煩雑になってしまう。本実施形態では、二次電池10の組み立てに際して、そうした凹部と凸部とを係合させる作業が不要になるため、ケース12の蓋14に電極端子を締結固定するための作業を簡素な手順で行うことができる。 In addition, the shape of the contact surface of the terminal cover 50 before assembling the secondary battery 10 has a shape having a convex portion that engages with the concave portion 14d of the case 12, or a shape having a convex portion that engages with the concave portion 14d of the electrode terminal. It is also possible to make it. In this case, it is necessary to engage the convex portion of the terminal cover 50 and the concave portion 14d of the case 12 when assembling the secondary battery 10, or to engage the convex portion of the terminal cover 50 and the concave portion 14d of the electrode terminal. Therefore, the assembly work becomes complicated. In the present embodiment, when the secondary battery 10 is assembled, the operation of engaging the concave portion and the convex portion is not necessary, and therefore, the operation for fastening and fixing the electrode terminal to the lid 14 of the case 12 is performed with a simple procedure. It can be carried out.
以上説明したように、本実施形態によれば、以下に記載する効果が得られるようになる。
(1)ケース12における端子カバー50との接触面としての内面14aが凹部14dを有し、電極端子の鍔部43における端子カバー50との接触面としての座面43aが凹部43cを有する。電極端子の雄ねじ44aへのナット55の螺合を通じて、ケース12における挿通孔14bの周縁と負極端子42の鍔部43とで端子カバー50を挟持させた状態でケース12と電極端子とを締結固定する締結固定構造を有する。そのため、第2工程における電極端子へのナット55の螺合に際して、端子カバー50の表面の一部を隆起させることによって同端子カバー50の表面形状をケース12の凹部14dや電極端子の凹部43cに係合する形状に変形させることができる。したがって、端子カバー50の変形部分とケース12の凹部14dとの係合や、電極端子の凹部43cと端子カバー50の変形部分との係合を通じて、ケース12と電極端子との相対回転を抑えることができる。これにより、電極端子にナット55を螺合するときや、電極端子へのバスバー60の取り付けに際してボルト61を螺合するときに、ナット55(或いはボルト61)ともども電極端子がケース12に対して相対回転する連れ回りの発生を抑えることができる。
As described above, according to the present embodiment, the following effects can be obtained.
(1) The inner surface 14a as a contact surface with the terminal cover 50 in the case 12 has a recess 14d, and the seat surface 43a as a contact surface with the terminal cover 50 in the flange portion 43 of the electrode terminal has a recess 43c. The case 12 and the electrode terminal are fastened and fixed in a state where the terminal cover 50 is sandwiched between the peripheral edge of the insertion hole 14b in the case 12 and the flange portion 43 of the negative electrode terminal 42 by screwing the nut 55 into the male screw 44a of the electrode terminal. A fastening and fixing structure. Therefore, when the nut 55 is screwed onto the electrode terminal in the second step, the surface shape of the terminal cover 50 is raised to the concave portion 14d of the case 12 or the concave portion 43c of the electrode terminal by raising a part of the surface of the terminal cover 50. It can be transformed into an engaging shape. Therefore, the relative rotation between the case 12 and the electrode terminal is suppressed through the engagement between the deformed portion of the terminal cover 50 and the recessed portion 14d of the case 12 and the engagement between the recessed portion 43c of the electrode terminal and the deformed portion of the terminal cover 50. Can do. Accordingly, when the nut 55 is screwed to the electrode terminal or when the bolt 61 is screwed when the bus bar 60 is attached to the electrode terminal, the electrode terminal is also relative to the case 12 together with the nut 55 (or the bolt 61). Occurrence of rotation accompanying rotation can be suppressed.
(2)二次電池10において、ケース12の凹部と電極端子の凹部とを端子カバー50の螺合方向において重なる位置に形成したと仮定した場合、それら凹部の形成位置でケース12と電極端子とによって端子カバー50を狭圧する力が、端子カバー50の両接触面をそれぞれ凹部内に向けて隆起させるように作用する。この場合、電極端子の雄ねじ44aにナット55を螺合させるときにおいて端子カバー50の両接触面を変形させる力が二方向に分散されるために小さくなり易く、その変形が適正に行われなくなるおそれがある。 (2) In the secondary battery 10, when it is assumed that the concave portion of the case 12 and the concave portion of the electrode terminal are formed at positions overlapping in the screwing direction of the terminal cover 50, the case 12 and the electrode terminal Thus, the force for narrowing the terminal cover 50 acts so that both contact surfaces of the terminal cover 50 are raised toward the recesses, respectively. In this case, when the nut 55 is screwed into the male screw 44a of the electrode terminal, the force for deforming both contact surfaces of the terminal cover 50 is dispersed in two directions and thus tends to be small, and the deformation may not be performed properly. There is.
上記二次電池10では、ケース12の凹部14dと電極端子の凹部43cとがナット55の螺合方向において重ならない位置に形成される。そのため、ケース12と電極端子とによって端子カバー50を挟持させる部分において、端子カバー50の両接触面51d,51eの一方の全体を凹部14d,43cの無い面によって支持した状態で、両接触面51d,51eの他方を凹部14d,43cの有る面によって押圧することができる。したがって、端子カバー50の各部において、ケース12と電極端子とによって端子カバー50を狭圧する力を同端子カバー50の両接触面51d,51eのうちの一方の面のみを隆起させるように作用させることができ、端子カバー50の一部を凹部14d,43c内に向けて適正に隆起させることができる。 In the secondary battery 10, the concave portion 14 d of the case 12 and the concave portion 43 c of the electrode terminal are formed at a position where they do not overlap in the screwing direction of the nut 55. Therefore, in the portion where the terminal cover 50 is sandwiched between the case 12 and the electrode terminal, both contact surfaces 51d are supported in a state where one of the contact surfaces 51d and 51e of the terminal cover 50 is supported by a surface without the recesses 14d and 43c. , 51e can be pressed by the surface having the recesses 14d, 43c. Therefore, in each part of the terminal cover 50, the force for narrowing the terminal cover 50 by the case 12 and the electrode terminal is caused to act so that only one of the contact surfaces 51d and 51e of the terminal cover 50 is raised. Thus, a part of the terminal cover 50 can be appropriately raised toward the recesses 14d and 43c.
(3)上記二次電池10では、電極端子にナット55やボルト61を螺合させるときに、ケース12の凹部14dと端子カバー50の変形部分(図7中に矢印Aで示す部分)とが係合する部分や、電極端子の凹部43cと端子カバー50の変形部分(図7中に矢印Bで示す部分)とが係合する部分に、同端子カバー50の螺合方向における回転軸L(図6参照)を中心とする円周方向(図7の左右方向)の力が作用する。 (3) In the secondary battery 10, when the nut 55 and the bolt 61 are screwed into the electrode terminal, the concave portion 14d of the case 12 and the deformed portion of the terminal cover 50 (the portion indicated by arrow A in FIG. 7) The rotating shaft L (in the screwing direction of the terminal cover 50) is engaged with the engaging portion or the portion where the recessed portion 43c of the electrode terminal and the deformed portion of the terminal cover 50 (the portion indicated by the arrow B in FIG. 7) are engaged. A force in the circumferential direction (refer to FIG. 7 in the left-right direction) acts around (see FIG. 6).
上記二次電池10では、ケース12の凹部14d及び電極端子の凹部43cが、ナット55の回転軸Lと直交する方向(図7の紙面垂直方向)、すなわち凹部14d,43cと端子カバー50の変形部分とが係合する部分に作用する円周方向の力と直交する方向に延設されている。そのため、凹部14d,43cと端子カバー50の変形部分との係合部分に作用する円周方向の力を、他の方向への偏向を極力抑えつつ、係合部分によって受け止めることができる。したがって、ケース12の凹部14dと端子カバー50の変形部分とが係合する力や、電極端子の凹部43cと端子カバー50の変形部分とが係合する力を効率よく利用して、ケース12と端子カバー50と電極端子との相対回転を好適に抑えることができる。 In the secondary battery 10, the concave portion 14 d of the case 12 and the concave portion 43 c of the electrode terminal are perpendicular to the rotation axis L of the nut 55 (perpendicular to the plane of FIG. 7), that is, the concave portions 14 d and 43 c and the terminal cover 50 are deformed. It extends in a direction perpendicular to the circumferential force acting on the portion with which the portion engages. Therefore, the circumferential force acting on the engagement portion between the concave portions 14d and 43c and the deformed portion of the terminal cover 50 can be received by the engagement portion while suppressing the deflection in the other direction as much as possible. Therefore, the case 12 and the recess 12d of the case 12 are engaged with the deformed portion of the terminal cover 50 and the force of engagement of the recessed portion 43c of the electrode terminal and the deformed portion of the terminal cover 50 are efficiently utilized. The relative rotation between the terminal cover 50 and the electrode terminal can be suitably suppressed.
(4)ケース12及び電極端子が端子カバー50と比較して硬度の高い材料により形成されている。そのため、ケース12の蓋14と電極端子の鍔部43とによって端子カバー50の蓋側絶縁板51を挟持させるときに、ケース12の蓋14や電極端子の鍔部43不要な変形を抑えつつ、端子カバー50の蓋側絶縁板51をケース12の凹部14d内や電極端子の凹部43c内に隆起させる態様で好適に変形させることができる。 (4) The case 12 and the electrode terminal are made of a material having a higher hardness than the terminal cover 50. Therefore, when the lid-side insulating plate 51 of the terminal cover 50 is sandwiched by the lid 14 of the case 12 and the flange 43 of the electrode terminal, while suppressing unnecessary deformation of the lid 14 of the case 12 and the flange 43 of the electrode terminal, The lid-side insulating plate 51 of the terminal cover 50 can be suitably deformed in such a manner that the lid-side insulating plate 51 is raised in the recess 14d of the case 12 or in the recess 43c of the electrode terminal.
(第2の実施形態)
以下、蓄電装置を二次電池に具体化した第2の実施形態について、第1の実施形態との相違点を中心に説明する。
(Second Embodiment)
Hereinafter, a second embodiment in which the power storage device is embodied as a secondary battery will be described focusing on differences from the first embodiment.
本実施形態の二次電池と第1の実施形態の二次電池とは、ケース12の蓋14の挿通孔14bに取り付けられる絶縁部材の形状が異なる。
以下、本実施形態の絶縁部材の形状について説明する。なお以下では、第1の実施形態と同一の構成については同一の符号を付して示し、その詳細な説明は割愛する。
The shape of the insulating member attached to the insertion hole 14b of the lid 14 of the case 12 differs between the secondary battery of the present embodiment and the secondary battery of the first embodiment.
Hereinafter, the shape of the insulating member of this embodiment will be described. In the following, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
図8に示すように、本実施形態の二次電池70の絶縁部材79は、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75を有する。このフランジ部75はナット55とケース12の蓋14との間に挟持されている。 As shown in FIG. 8, the insulating member 79 of the secondary battery 70 of the present embodiment has a flange portion 75 that extends radially outward from one axial end of the cylindrical portion 24. The flange portion 75 is sandwiched between the nut 55 and the lid 14 of the case 12.
図9に示すように、二次電池70は、ナット55の螺合方向(図中の上下方向)において、端子カバー50の蓋側絶縁板51におけるケース12の蓋14と電極端子の鍔部43とに挟持させた挟持部分(図中に矢印Cで示す部分)全体が、絶縁部材79の上記ケース12に接触している接触部分(図中に矢印Dで示す部分)とオーバーラップしている。 As shown in FIG. 9, the secondary battery 70 includes the lid 14 of the case 12 and the flange 43 of the electrode terminal in the lid-side insulating plate 51 of the terminal cover 50 in the screwing direction (vertical direction in the drawing) of the nut 55. The entire sandwiched portion (portion indicated by an arrow C in the drawing) overlaps with a contact portion (portion indicated by an arrow D in the drawing) of the insulating member 79 that is in contact with the case 12. .
以下、こうした絶縁部材79を有する二次電池70の作用について説明する。
図10に、絶縁部材79の接触部分と端子カバー50の挟持部分とがナット55の螺合方向においてオーバーラップしていない比較例の二次電池の断面構造を示す。
Hereinafter, the operation of the secondary battery 70 having such an insulating member 79 will be described.
FIG. 10 shows a cross-sectional structure of a secondary battery of a comparative example in which the contact portion of the insulating member 79 and the sandwiching portion of the terminal cover 50 do not overlap in the screwing direction of the nut 55.
図10に示すように、この比較例の二次電池では、電極端子へのナットの螺合に際して、ケース12と電極端子とによって端子カバー50を挟持している部分を絶縁部材79によって螺合方向から押さえることができない。そのため絶縁部材79によってケース12の蓋14が押圧されるときに、図10中に一点鎖線で示すようにケース12の蓋14における端子カバー50を挟持している部分が不要に撓むなどして、ケース12と端子カバー50との接触面の面圧や電極端子と端子カバー50との接触面の面圧が不要に低くなるおそれがある。この場合、前述したケース12の凹部14dと端子カバー50の変形部分との係合力や、電極端子の凹部と端子カバー50の変形部分との係合力が小さくなるため、それら係合力によるケース12と端子カバー50と電極端子との相対移動を抑える効果が低下してしまう。 As shown in FIG. 10, in the secondary battery of this comparative example, when the nut is screwed to the electrode terminal, the portion where the terminal cover 50 is sandwiched between the case 12 and the electrode terminal is screwed by the insulating member 79. Can not hold from. Therefore, when the cover 14 of the case 12 is pressed by the insulating member 79, the portion of the cover 14 of the case 12 that holds the terminal cover 50 is unnecessarily bent as shown by a one-dot chain line in FIG. There is a possibility that the surface pressure of the contact surface between the case 12 and the terminal cover 50 and the surface pressure of the contact surface between the electrode terminal and the terminal cover 50 may become unnecessarily low. In this case, the engaging force between the concave portion 14d of the case 12 and the deformed portion of the terminal cover 50 and the engaging force between the concave portion of the electrode terminal and the deformed portion of the terminal cover 50 are reduced. The effect of suppressing the relative movement between the terminal cover 50 and the electrode terminal is reduced.
図9に示すように、本実施形態の二次電池70では、絶縁部材79のフランジ部75がケース12の蓋14に接触している接触部分Dと端子カバー50の蓋側絶縁板51を挟持させた挟持部分Cの全体とがナット55の螺合方向においてオーバーラップしている。 As shown in FIG. 9, in the secondary battery 70 of the present embodiment, the contact portion D where the flange portion 75 of the insulating member 79 is in contact with the lid 14 of the case 12 and the lid-side insulating plate 51 of the terminal cover 50 are sandwiched. The entire sandwiched portion C overlaps with the nut 55 in the screwing direction.
そのため、電極端子の雄ねじ44aにナット55を螺合するときに、ケース12の蓋14と電極端子の蓋側絶縁板51とによって端子カバー50を挟持させる挟持部分の全体を絶縁部材79によって上記螺合方向から押圧することができる。しかも、電極端子の雄ねじ44aへのナット55の螺合を通じてケース12と負極端子42とを締結固定した後においても同様に、上記挟持部分を押圧部材としての絶縁部材79によってナット55の螺合方向から押圧することができる。 Therefore, when the nut 55 is screwed into the male screw 44a of the electrode terminal, the entire clamping portion where the terminal cover 50 is clamped by the lid 14 of the case 12 and the lid-side insulating plate 51 of the electrode terminal is screwed by the insulating member 79. It can be pressed from the opposite direction. In addition, even after the case 12 and the negative electrode terminal 42 are fastened and fixed through screwing of the nut 55 to the male screw 44a of the electrode terminal, the screwing direction of the nut 55 is similarly performed by the insulating member 79 as the pressing member. Can be pressed from.
したがって、ケース12の蓋14の接触面としての内面14aと端子カバー50の蓋側絶縁板51の接触面51dとの面圧や電極端子の接触面としての座面43aと端子カバー50の接触面51eとの面圧が不要に低くなることを抑えることができる。 Therefore, the contact pressure between the inner surface 14a as the contact surface of the cover 14 of the case 12 and the contact surface 51d of the cover-side insulating plate 51 of the terminal cover 50 and the contact surface 43a as the contact surface of the electrode terminal and the contact surface of the terminal cover 50. It can suppress that the surface pressure with 51e becomes unnecessarily low.
以上説明したように、本実施形態によれば、先の(1)〜(4)に記載の効果に加えて、以下の(5)及び(5)に記載する効果が得られるようになる。
(5)ナット55の螺合方向において、端子カバー50におけるケース12と電極端子との間に挟持させた挟持部分が、絶縁部材79における上記ケース12に接触している接触部分とオーバーラップしている。そのため、ケース12と端子カバー50との接触面の面圧や電極端子と端子カバー50との接触面の面圧が不要に低くなることを抑えることができ、ケース12と端子カバー50と電極端子との相対移動を好適に抑えることができる。これにより、負極端子42にナット55を螺合するときや、負極端子42へのバスバー60の取り付けに際してボルト61を螺合するときに、ナット55(或いはボルト61)ともども負極端子42がケース12に対して相対回転する連れ回りの発生を好適に抑えることができる。
As described above, according to this embodiment, in addition to the effects described in (1) to (4) above, the effects described in (5) and (5) below can be obtained.
(5) In the screwing direction of the nut 55, the sandwiched portion of the terminal cover 50 sandwiched between the case 12 and the electrode terminal overlaps with the contact portion of the insulating member 79 that is in contact with the case 12. Yes. Therefore, it is possible to suppress the surface pressure of the contact surface between the case 12 and the terminal cover 50 and the surface pressure of the contact surface between the electrode terminal and the terminal cover 50 from being unnecessarily lowered, and the case 12, the terminal cover 50, and the electrode terminal. Relative movement can be suitably suppressed. Accordingly, when the nut 55 is screwed to the negative electrode terminal 42 or when the bolt 61 is screwed when the bus bar 60 is attached to the negative electrode terminal 42, the negative electrode terminal 42 is also attached to the case 12 together with the nut 55 (or the bolt 61). On the other hand, it is possible to suitably suppress the occurrence of accompanying rotation that rotates relative to each other.
(6)ナット55の螺合方向において、上記端子カバー50を挟持させた挟持部分の全体が、絶縁部材79の接触部分とオーバーラップしている。そのため、上記挟持部分の全体を絶縁部材79の接触部分によって螺合方向から押圧することができ、ケース12の接触面としての内面14aと端子カバー50の接触面51dとの面圧や電極端子の接触面としての座面43aと端子カバー50の接触面51eとの面圧が不要に低くなることを確実に抑えることができる。 (6) In the screwing direction of the nut 55, the entire clamping portion where the terminal cover 50 is clamped overlaps the contact portion of the insulating member 79. Therefore, the entire clamping portion can be pressed from the screwing direction by the contact portion of the insulating member 79, and the contact pressure between the inner surface 14 a as the contact surface of the case 12 and the contact surface 51 d of the terminal cover 50 and the electrode terminal It can be reliably suppressed that the surface pressure between the seating surface 43a as the contact surface and the contact surface 51e of the terminal cover 50 becomes unnecessarily low.
(第3の実施形態)
以下、蓄電装置を二次電池に具体化した第3の実施形態について、第1の実施形態及び第2の実施形態との相違点を中心に説明する。
(Third embodiment)
Hereinafter, a third embodiment in which the power storage device is embodied as a secondary battery will be described focusing on differences from the first embodiment and the second embodiment.
本実施形態の二次電池と第1の実施形態の二次電池や第2の実施形態の二次電池とは、ケースの蓋の形状と、端子カバーの形状と、電極端子の形状とが異なる。
以下、それらケースの蓋、端子カバー、及び電極端子の形状について各別に説明する。なお以下では、第1の実施形態及び第2の実施形態と同一の構成については同一の符号を付して示し、その詳細な説明は割愛する。
The secondary battery of the present embodiment, the secondary battery of the first embodiment, and the secondary battery of the second embodiment are different in the shape of the case lid, the shape of the terminal cover, and the shape of the electrode terminal. .
Hereinafter, the shapes of the lid of the case, the terminal cover, and the electrode terminal will be described separately. In the following, the same components as those in the first embodiment and the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
図11または図12に示すように、組み付け前のケース82の蓋84は凹部を有しておらず、平板形状である。また、ケース82の蓋84は二つの挿通孔14bを有する。
図11または図13に示すように、端子カバー81の蓋側絶縁板51は、ケース82の蓋84と接触する接触面51dに凸部81aを有する。この凸部81aは先鋭形状(詳しくは、円錐形状)である。凸部81aは、平面視略U字形状で延びる蓋側絶縁板51の延設方向における中間位置に一つのみ形成される。端子カバー81の蓋側絶縁板51の電極端子の座面83a側の面は、凸部を有しておらず、平面形状である。
As shown in FIG. 11 or FIG. 12, the lid 84 of the case 82 before assembly does not have a recess and has a flat plate shape. The lid 84 of the case 82 has two insertion holes 14b.
As shown in FIG. 11 or FIG. 13, the lid-side insulating plate 51 of the terminal cover 81 has a convex portion 81 a on the contact surface 51 d that contacts the lid 84 of the case 82. The convex portion 81a has a sharp shape (specifically, a conical shape). Only one convex portion 81a is formed at an intermediate position in the extending direction of the lid-side insulating plate 51 extending in a substantially U shape in plan view. The surface on the seating surface 83a side of the electrode terminal of the lid-side insulating plate 51 of the terminal cover 81 does not have a convex portion and has a planar shape.
図11または図14示すように、正極端子85は、端子カバー81の蓋側絶縁板51側の接触面としての座面43aに、凸部87を有する。この凸部87は先鋭形状(詳しくは、円錐形状)である。凸部87は、ナット55の螺合方向(図10の上下方向)から見て、端子カバー81の凸部81aと重なる位置に一つのみ形成される。なお本実施形態では、負極端子86は上記正極端子85と同様に、鍔部83の接触面としての座面43aに凸部87を有する。 As shown in FIG. 11 or FIG. 14, the positive electrode terminal 85 has a convex portion 87 on a seat surface 43 a as a contact surface on the lid-side insulating plate 51 side of the terminal cover 81. The convex portion 87 has a sharp shape (specifically, a conical shape). Only one protrusion 87 is formed at a position overlapping the protrusion 81 a of the terminal cover 81 as viewed from the screwing direction of the nut 55 (the vertical direction in FIG. 10). In the present embodiment, the negative electrode terminal 86 has a convex portion 87 on the seat surface 43 a as a contact surface of the flange portion 83, similarly to the positive electrode terminal 85.
図11に示す二次電池80では、電極端子(正極端子85または負極端子86)の形成材料は端子カバー81の形成材料より硬度が高く、端子カバー81の形成材料はケース82の形成材料より硬度が高い。二次電池80では、ケース82、端子カバー81、電極端子の順に硬度が高くなる態様で、それらケース82、端子カバー81及び電極端子の形成材料が定められている。そして、二次電池80では、ケース82と端子カバー81との接触部分では同端子カバー81が凸部81aを有し、端子カバー81と電極端子との接触部分では同電極端子が凸部87を有するといったように、ケース82や端子カバー81、電極端子の接触部分において、形成材料の硬度が高いほうの部材に凸部81a,87が形成されている。 In the secondary battery 80 shown in FIG. 11, the forming material of the electrode terminal (positive terminal 85 or negative electrode 86) is harder than the forming material of the terminal cover 81, and the forming material of the terminal cover 81 is harder than the forming material of the case 82. Is expensive. In the secondary battery 80, materials for forming the case 82, the terminal cover 81, and the electrode terminal are determined in such a manner that the hardness increases in the order of the case 82, the terminal cover 81, and the electrode terminal. In the secondary battery 80, the terminal cover 81 has a convex portion 81 a at the contact portion between the case 82 and the terminal cover 81, and the electrode terminal has the convex portion 87 at the contact portion between the terminal cover 81 and the electrode terminal. As shown in the figure, in the contact portion of the case 82, the terminal cover 81, and the electrode terminal, convex portions 81a and 87 are formed on the member having a higher hardness of the forming material.
二次電池80の製造に際しては、上述した形状でケース82の蓋84、端子カバー81、各電極端子が形成される。本実施形態では、それらケース82の蓋84、端子カバー81、及び各電極端子を形成する工程が前工程になる。 When manufacturing the secondary battery 80, the lid 84, the terminal cover 81, and each electrode terminal of the case 82 are formed in the above-described shape. In this embodiment, the process of forming the lid 84 of the case 82, the terminal cover 81, and each electrode terminal is a pre-process.
そして、二次電池80を製造する際には、ケース82の蓋84における挿通孔14bの周縁と電極端子の鍔部83との間に端子カバー81の蓋側絶縁板51を配置した状態で、ナット55が電極端子の雄ねじ44aに螺合され、これによりケース82と電極端子とが締結固定される。本実施形態では、ケース82と電極端子とを締結固定する工程が、後工程になる。 And when manufacturing the secondary battery 80, with the lid-side insulating plate 51 of the terminal cover 81 disposed between the peripheral edge of the insertion hole 14b in the lid 84 of the case 82 and the flange 83 of the electrode terminal, The nut 55 is screwed into the male screw 44a of the electrode terminal, whereby the case 82 and the electrode terminal are fastened and fixed. In the present embodiment, the step of fastening and fixing the case 82 and the electrode terminal is a post-process.
次に、二次電池80の作用について説明する。
二次電池80では、前工程において、ケース82の蓋84(図11及び図12参照)における上記端子カバー81の凸部81aが接触する部分や、端子カバー81の蓋側絶縁板51(図11及び図13参照)における電極端子の凸部87が接触する部分に、凹部が形成されない。
Next, the operation of the secondary battery 80 will be described.
In the secondary battery 80, in the previous step, the portion of the lid 84 of the case 82 (see FIGS. 11 and 12) where the convex portion 81a of the terminal cover 81 contacts, or the lid-side insulating plate 51 of the terminal cover 81 (FIG. 11). And a recessed part is not formed in the part which the convex part 87 of the electrode terminal contacts in FIG. 13).
とはいえ図15に示すように、後工程において、電極端子にナット55を螺合してケース82における挿通孔14bの周縁と電極端子の鍔部83との間で端子カバー81の蓋側絶縁板51を挟持させる過程で、ケース82と端子カバー81との接触部分ではケース82の蓋84の表面に端子カバー81の凸部87が刺さる。また、この後工程において、端子カバー81の蓋側絶縁板51と電極端子の鍔部83との接触部分では、端子カバー81の表面に電極端子の凸部87が刺さる。 However, as shown in FIG. 15, in the subsequent step, the nut 55 is screwed into the electrode terminal, and the lid side insulation of the terminal cover 81 is formed between the peripheral edge of the insertion hole 14b in the case 82 and the flange 83 of the electrode terminal. In the process of sandwiching the plate 51, the convex portion 87 of the terminal cover 81 is stuck on the surface of the lid 84 of the case 82 at the contact portion between the case 82 and the terminal cover 81. Further, in this subsequent step, the convex portion 87 of the electrode terminal pierces the surface of the terminal cover 81 at the contact portion between the lid-side insulating plate 51 of the terminal cover 81 and the flange 83 of the electrode terminal.
なお、ケース82の蓋84の接触面としての内面14aと電極端子の鍔部83の接触面としての座面83aとを凸部を有する形状にするとともに、それら面14a,83aの凸部が端子カバー81に刺される構造を採用することも可能である。この場合、ケース82の蓋84と電極端子の鍔部83とに挟持される端子カバー81の蓋側絶縁板51に各面14a,83aから凸部が刺さるため、同蓋側絶縁板51の内部応力が大きくなり易く、端子カバー81の耐久性能の低下を招くおそれがあり、場合によっては同端子カバー81が破損するおそれもある。この点、本実施形態では、ケース82の蓋84と電極端子の鍔部83とに挟持される端子カバー81の蓋側絶縁板51に一方の接触面のみから凸部87が刺さる構造であるため、端子カバー81の内部応力の増大が抑えられて耐久性能の低下が抑えられる。 The inner surface 14a as the contact surface of the lid 84 of the case 82 and the seating surface 83a as the contact surface of the collar portion 83 of the electrode terminal have a shape having protrusions, and the protrusions of these surfaces 14a and 83a are terminals. It is also possible to adopt a structure that is pierced by the cover 81. In this case, since the convex portions stick to the lid-side insulating plate 51 of the terminal cover 81 sandwiched between the lid 84 of the case 82 and the flange 83 of the electrode terminal from each surface 14a, 83a, the inside of the lid-side insulating plate 51 The stress is likely to increase, and the durability of the terminal cover 81 may be lowered. In some cases, the terminal cover 81 may be damaged. In this respect, in the present embodiment, since the convex portion 87 is stuck into the lid-side insulating plate 51 of the terminal cover 81 sandwiched between the lid 84 of the case 82 and the collar portion 83 of the electrode terminal from only one contact surface. In addition, an increase in internal stress of the terminal cover 81 is suppressed, and a decrease in durability is suppressed.
以上説明したように、本実施形態によれば、以下に記載する効果が得られるようになる。
(7)ケース82、端子カバー81、各電極端子の順に硬度が高くなる態様で、それらケース82、端子カバー81及び各電極端子の形成材料が定められている。また、ケース82の蓋84と端子カバー81の蓋側絶縁板51との接触部分や端子カバー81の蓋側絶縁板51と電極端子の鍔部83との接触部分において、形成材料の硬度が高いほうの部材に凸部81a,87が形成されている。そして、ケース82における挿通孔14bの周縁と電極端子の鍔部83との間に端子カバー81の蓋側絶縁板51を配置した状態で、ナット55が電極端子の雄ねじに螺合されて、ケース82と電極端子とが締結固定される。そのため、後工程において、ケース82の蓋84の表面に端子カバー81の凸部87が刺さるとともに、端子カバー81の表面に電極端子の凸部87が刺さる。これによりケース82と端子カバー81とが係合するとともに、端子カバー81と電極端子とが係合するため、それらの係合を通じてケース82と電極端子との相対回転が抑えられる。したがって、電極端子にナット55を螺合するときや電極端子へのバスバー60の取り付けに際してボルト61を螺合するときに、ナット55(或いはボルト61)ともども電極端子がケース82に対して相対回転する連れ回りの発生を抑えることができる。
As described above, according to the present embodiment, the following effects can be obtained.
(7) The material for forming the case 82, the terminal cover 81, and each electrode terminal is determined so that the hardness increases in the order of the case 82, the terminal cover 81, and each electrode terminal. Further, the hardness of the forming material is high at the contact portion between the lid 84 of the case 82 and the lid-side insulating plate 51 of the terminal cover 81 and the contact portion between the lid-side insulating plate 51 of the terminal cover 81 and the flange 83 of the electrode terminal. Protrusions 81a and 87 are formed on this member. Then, in a state where the lid-side insulating plate 51 of the terminal cover 81 is disposed between the peripheral edge of the insertion hole 14b in the case 82 and the flange 83 of the electrode terminal, the nut 55 is screwed into the male screw of the electrode terminal, 82 and the electrode terminal are fastened and fixed. Therefore, in the subsequent process, the convex portion 87 of the terminal cover 81 is stuck in the surface of the lid 84 of the case 82, and the convex portion 87 of the electrode terminal is stuck in the surface of the terminal cover 81. As a result, the case 82 and the terminal cover 81 engage with each other, and the terminal cover 81 and the electrode terminal engage with each other. Therefore, the relative rotation between the case 82 and the electrode terminal is suppressed through the engagement. Therefore, when the nut 55 is screwed to the electrode terminal or when the bolt 61 is screwed when the bus bar 60 is attached to the electrode terminal, the electrode terminal also rotates relative to the case 82 together with the nut 55 (or bolt 61). Occurrence of accompaniment can be suppressed.
(8)端子カバー81の蓋側絶縁板51の凸部81aと電極端子の鍔部83の凸部87とが先鋭形状である。そのため、ケース82の蓋84と電極端子の鍔部83との間で端子カバー81の蓋側絶縁板51を挟持させるときに、端子カバー81の蓋側絶縁板51やケース82の蓋84に凸部81a,87が好適に刺さるようになる。 (8) The convex part 81a of the lid-side insulating plate 51 of the terminal cover 81 and the convex part 87 of the collar part 83 of the electrode terminal have a sharp shape. Therefore, when the lid-side insulating plate 51 of the terminal cover 81 is sandwiched between the lid 84 of the case 82 and the flange 83 of the electrode terminal, the lid-side insulating plate 51 of the terminal cover 81 and the lid 84 of the case 82 are convex. The parts 81a and 87 are suitably inserted.
(他の実施形態)
なお、上記各実施形態は、以下のように変更して実施してもよい。
○ 第1の実施形態において、ケース12の蓋14の凹部14dと電極端子(正極端子41または負極端子42)の鍔部43の凹部43cとを、ナット55の螺合方向において重なる位置に形成してもよい。
(Other embodiments)
Each of the above embodiments may be modified as follows.
In the first embodiment, the concave portion 14d of the lid 14 of the case 12 and the concave portion 43c of the flange portion 43 of the electrode terminal (positive electrode terminal 41 or negative electrode terminal 42) are formed at positions overlapping in the screwing direction of the nut 55. May be.
○ 第1の実施形態のケース12の蓋14の凹部14dや電極端子の鍔部43の凹部43cとして、図16に示すように、その縁部がナット55の回転軸Lと直交する方向に延びる形状の凹部91を形成してもよい。 As shown in FIG. 16, the edge of the recess 14 d of the lid 14 of the case 12 of the first embodiment and the recess 43 c of the flange 43 of the electrode terminal extend in a direction perpendicular to the rotation axis L of the nut 55. A concave portion 91 having a shape may be formed.
○ 第1の実施形態のケース12の蓋14の凹部14dや電極端子の鍔部43の凹部43cに代えて、図17に示すように、円形状の凹部92を形成してもよい。また、円形状の凹部92に限らず、多角形状の凹部を形成したり、円弧形状の凹部を形成したりしてもよい。更には、凹部を1つのみ形成したり、任意の数(2、3、5〜7、9つ以上)だけ形成したりしてもよい。ケース12の蓋14や電極端子の鍔部43に形成する凹部の形状や数は任意に変更することができる。 As shown in FIG. 17, a circular recess 92 may be formed instead of the recess 14 d of the lid 14 of the case 12 and the recess 43 c of the flange 43 of the electrode terminal of the first embodiment. In addition to the circular recess 92, a polygonal recess or an arc-shaped recess may be formed. Furthermore, you may form only one recessed part, or may form only arbitrary numbers (2, 3, 5-7, 9 or more). The shape and number of recesses formed in the lid 14 of the case 12 and the flange 43 of the electrode terminal can be arbitrarily changed.
○ 第1の実施形態において、ケース12の蓋14の挿通孔14bの周縁と電極端子の座面43aとの間に端子カバー50の蓋側絶縁板51を挟持させる挟持部分の構造を、正極端子41の挟持部分及び負極端子42の挟持部分の一方のみに適用してもよい。 In the first embodiment, the structure of the clamping part that clamps the lid-side insulating plate 51 of the terminal cover 50 between the peripheral edge of the insertion hole 14b of the lid 14 of the case 12 and the seat surface 43a of the electrode terminal is the positive terminal You may apply only to one of the clamping part of 41, and the clamping part of the negative electrode terminal 42. FIG.
○ 第1の実施形態において、蓋14の凹部14dや、鍔部43の凹部43cは、それぞれ等角度間隔でなくてもよい。
○ 第1の実施形態において、鍔部43の断面積が挿通孔14bの開口面積より大きくなくてもよい。つまり、鍔部43において、蓋14の挿通孔14bの周縁と鍔部43の座面43aとの少なくとも一部が対向していればよい。
In the first embodiment, the concave portion 14d of the lid 14 and the concave portion 43c of the collar portion 43 do not have to be equiangular intervals.
In the first embodiment, the cross-sectional area of the flange 43 may not be larger than the opening area of the insertion hole 14b. That is, in the collar part 43, at least a part of the peripheral edge of the insertion hole 14 b of the lid 14 and the seating surface 43 a of the collar part 43 may be opposed to each other.
○ 第1の実施形態において、蓋14の内面14aにおける凹部14d以外の部分や、鍔部43の座面43aにおける凹部43c以外の部分、蓋側絶縁板51の接触面51d,51eにおける上記凹部14d,43cに対向する部分以外の部分の表面形状は、任意に変更することができる。そうした表面形状としては、例えばナット55の螺合方向において一方向に向かうほど内径が小さくなるテーパ形状を採用したり、表面に若干のうねりを有する形状を採用したりすることができる。要は、蓋側絶縁板51と蓋14とが面接触するとともに同蓋側絶縁板51と蓋14とが面接触する形状であり、蓋側絶縁板51の接触面51d,51eにおいて、蓋14の凹部14dに対向する位置や鍔部43の凹部43cに対向する場所に凸部を有しない形状であればよい。 In the first embodiment, a portion other than the concave portion 14d on the inner surface 14a of the lid 14, a portion other than the concave portion 43c on the seating surface 43a of the flange portion 43, and the concave portion 14d on the contact surfaces 51d and 51e of the lid-side insulating plate 51. , 43c can be arbitrarily changed in the surface shape of the part other than the part facing the part. As such a surface shape, for example, a tapered shape in which the inner diameter becomes smaller toward one direction in the screwing direction of the nut 55, or a shape having a slight undulation on the surface can be adopted. The point is that the lid-side insulating plate 51 and the lid 14 are in surface contact with each other, and the lid-side insulating plate 51 and the lid 14 are in surface contact with each other. The contact surfaces 51d and 51e of the lid-side insulating plate 51 are covered with the lid 14. Any shape may be used as long as it does not have a convex portion at a position opposed to the concave portion 14 d of the ridge portion 43 or a location facing the concave portion 43 c of the flange portion 43.
○ 第2の実施形態において、図18に示すように、絶縁部材109における上記ケース12の蓋14に接触している接触部分の極柱部44側の部分に切り欠き部101を形成してよい。 In 2nd Embodiment, as shown in FIG. 18, you may form the notch part 101 in the part by the side of the pole part 44 of the contact part which is contacting the cover 14 of the said case 12 in the insulating member 109. .
○ 第2の実施形態において、ケース12の蓋14と電極端子とで端子カバー50を挟持させている挟持部分の全体を絶縁部材79のケースに接触している接触部分とオーバーラップさせる構造に限らず、第1の実施形態の二次電池10(図4参照)のように、上記挟持部分の一部のみを絶縁部材の接触部分とオーバーラップさせるようにしてもよい。 In the second embodiment, the structure is limited to a structure in which the entire sandwiched portion in which the terminal cover 50 is sandwiched between the lid 14 of the case 12 and the electrode terminal is overlapped with the contact portion in contact with the case of the insulating member 79. Instead, as in the secondary battery 10 of the first embodiment (see FIG. 4), only a part of the sandwiched portion may overlap the contact portion of the insulating member.
○ 第2の実施形態において、ケース12の蓋14の挿通孔14bの周縁と電極端子の座面43aとの間に端子カバー50の蓋側絶縁板51を挟持させる挟持部分の構造を、第3の実施形態の挟持部分の構造としてもよい。その他、上記挟持部分の構造を、ケースの蓋の挿通孔の周縁と端子カバーの鍔部との接触部分や電極端子の座面と端子カバーの蓋側絶縁板との接触部分において、それらの接触面の一方の凸部と他方の凹部とが係合する構造としたり、それらの接触面の少なくとも一方が粗面である構造としたりすることもできる。 In the second embodiment, the structure of the sandwiching portion that sandwiches the lid-side insulating plate 51 of the terminal cover 50 between the peripheral edge of the insertion hole 14b of the lid 14 of the case 12 and the seat surface 43a of the electrode terminal is the third. It is good also as a structure of the clamping part of the embodiment. In addition, the structure of the above-mentioned sandwiching portion is determined by contacting the contact portion between the peripheral edge of the insertion hole of the case lid and the collar portion of the terminal cover, or the contact portion between the seat surface of the electrode terminal and the lid side insulating plate of the terminal cover. It can also be set as the structure where one convex part and other concave part of a surface engage, or it can be set as the structure where at least one of those contact surfaces is a rough surface.
○ 第3の実施形態において、端子カバー81の蓋側絶縁板51の凸部81aや、電極端子の鍔部83の凸部87を複数形成してもよい。
○ 第3の実施形態において、端子カバー81の蓋側絶縁板51の凸部81aの形成位置は、同端子カバー81の蓋側絶縁板51において上記ケース12の蓋84と接触する部分であれば、任意に変更することができる。
In the third embodiment, a plurality of convex portions 81 a of the lid-side insulating plate 51 of the terminal cover 81 and convex portions 87 of the flange portions 83 of the electrode terminals may be formed.
In the third embodiment, the position where the convex portion 81a of the lid-side insulating plate 51 of the terminal cover 81 is formed is a portion that contacts the lid 84 of the case 12 in the lid-side insulating plate 51 of the terminal cover 81. Can be changed arbitrarily.
○ 第3の実施形態において、電極端子の鍔部83の凸部87の形成位置は、電極端子の座面83aにおいて端子カバー81の蓋側絶縁板51と接触する部分であれば、任意に変更することができる。 ○ In the third embodiment, the formation position of the convex portion 87 of the collar portion 83 of the electrode terminal is arbitrarily changed as long as it is a portion that contacts the lid-side insulating plate 51 of the terminal cover 81 on the seat surface 83a of the electrode terminal. can do.
○ 第3の実施形態において、端子カバー81の凸部81aと電極端子の凸部87とを、ナット55の螺合方向から見て重ならない位置に形成してもよい。
○ 第3の実施形態の凸部81a,87の形状として、円錐形状を採用することに限らず、多角錘形状(例えば三角錐形状や四角錐形状)や半球形状など、任意の形状を採用することができる。
In the third embodiment, the convex portion 81 a of the terminal cover 81 and the convex portion 87 of the electrode terminal may be formed at positions that do not overlap when viewed from the screwing direction of the nut 55.
○ The shape of the convex portions 81a and 87 of the third embodiment is not limited to the conical shape, and any shape such as a polygonal pyramid shape (for example, a triangular pyramid shape or a quadrangular pyramid shape) or a hemispherical shape is employed. be able to.
○ 第3の実施形態において、ケース82の蓋84の挿通孔14bの周縁と電極端子(正極端子85または負極端子86)の座面83aとの間に端子カバー81の蓋側絶縁板51を挟持させる挟持部分の構造を、次の構造としてもよい。ケース82、端子カバー81、各電極端子の順に硬度が低くなる態様で、それらケース82、端子カバー81及び各電極端子の形成材料を定める。ケース82と端子カバー81との接触部分や端子カバー81と電極端子との接触部分において、形成材料の硬度が高いほうの部材に凸部を形成する。具体的には、図19に示すように、ケース82の蓋84の端子カバー81との接触面としての内面14aに凸部111を有する。また、図20に示すように、端子カバー81の蓋側絶縁板51の電極端子の座面83a側(図中右側)の面に、凸部112を有する。なお、組み付け前の電極端子の座面83aは凸部を有しておらず、平面形状である。そして、ケース82の蓋84における挿通孔14bの周縁と電極端子の鍔部83との間に端子カバー81の蓋側絶縁板51を配置した状態で、ナット55を電極端子の雄ねじ44aに螺合して、ケース82と電極端子とを締結固定する。 In the third embodiment, the lid-side insulating plate 51 of the terminal cover 81 is sandwiched between the periphery of the insertion hole 14b of the lid 84 of the case 82 and the seat surface 83a of the electrode terminal (positive electrode terminal 85 or negative electrode terminal 86). The structure of the clamping part to be made may be the following structure. The case 82, the terminal cover 81, and the electrode terminals are formed in the order of decreasing hardness, and materials for forming the case 82, the terminal cover 81, and the electrode terminals are determined. At the contact portion between the case 82 and the terminal cover 81 or the contact portion between the terminal cover 81 and the electrode terminal, a convex portion is formed on the member having a higher hardness of the forming material. Specifically, as shown in FIG. 19, a convex portion 111 is provided on an inner surface 14 a as a contact surface of the lid 84 of the case 82 with the terminal cover 81. Further, as shown in FIG. 20, a convex portion 112 is provided on the surface of the electrode terminal of the lid-side insulating plate 51 of the terminal cover 81 on the seating surface 83 a side (right side in the drawing). It should be noted that the seat surface 83a of the electrode terminal before assembly does not have a convex portion and has a planar shape. Then, the nut 55 is screwed onto the male screw 44a of the electrode terminal in a state where the lid-side insulating plate 51 of the terminal cover 81 is disposed between the peripheral edge of the insertion hole 14b in the lid 84 of the case 82 and the flange 83 of the electrode terminal. Then, the case 82 and the electrode terminal are fastened and fixed.
こうした二次電池では、電極端子にナット55を螺合してケース82の蓋84における挿通孔14bの周縁と電極端子の鍔部83との間で端子カバー81の蓋側絶縁板51を挟持させる過程で、ケース82の蓋84と端子カバー81の蓋側絶縁板51との接触部分では端子カバー81の蓋側絶縁板51の表面にケース82の蓋84の凸部87が刺さる。また上記過程で、端子カバー81の蓋側絶縁板51と電極端子の鍔部83との接触部分において電極端子の鍔部83表面に端子カバー81の凸部112が刺さる。これによりケース82と端子カバー81とが係合するとともに、端子カバー81と電極端子とが係合するため、それらの係合を通じてケース82と電極端子との相対回転が抑えられる。 In such a secondary battery, the nut 55 is screwed into the electrode terminal, and the lid-side insulating plate 51 of the terminal cover 81 is sandwiched between the peripheral edge of the insertion hole 14b in the lid 84 of the case 82 and the flange 83 of the electrode terminal. In the process, at the contact portion between the lid 84 of the case 82 and the lid-side insulating plate 51 of the terminal cover 81, the convex portion 87 of the lid 84 of the case 82 pierces the surface of the lid-side insulating plate 51 of the terminal cover 81. Further, in the above process, the convex portion 112 of the terminal cover 81 is stuck in the surface of the collar portion 83 of the electrode terminal at the contact portion between the lid-side insulating plate 51 of the terminal cover 81 and the collar portion 83 of the electrode terminal. As a result, the case 82 and the terminal cover 81 engage with each other, and the terminal cover 81 and the electrode terminal engage with each other. Therefore, the relative rotation between the case 82 and the electrode terminal is suppressed through the engagement.
○ 第3の実施形態において、ケース82の蓋84の挿通孔14bの周縁と電極端子の座面83aとの間に端子カバー81の蓋側絶縁板51を挟持させる挟持部分の構造を、正極端子85の挟持部分及び負極端子86の挟持部分の一方のみに適用してもよい。 In the third embodiment, the structure of the clamping portion that clamps the lid-side insulating plate 51 of the terminal cover 81 between the peripheral edge of the insertion hole 14b of the lid 84 of the case 82 and the seat surface 83a of the electrode terminal is the positive electrode terminal. You may apply only to one of the clamping part of 85, and the clamping part of the negative electrode terminal 86. FIG.
○ 各実施形態におけるケース12と端子カバー50と電極端子との相対移動を抑える移動抑制構造は、電極端子をケース12に締結固定するために、極柱部44の外面の雄ねじ44aにナット55を螺合する二次電池10に限らず、電極端子の極柱部にかしめ部材をかしめ固定(締結)する二次電池にも適用することができる。 In the embodiment, the movement restraining structure that suppresses relative movement among the case 12, the terminal cover 50, and the electrode terminal is provided with a nut 55 on the external thread 44a on the outer surface of the pole column 44 in order to fasten and fix the electrode terminal to the case 12. The present invention can be applied not only to the secondary battery 10 to be screwed but also to a secondary battery in which a caulking member is caulked and fixed (fastened) to the pole column portion of the electrode terminal.
○ 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。
○ 電極組立体20は、帯状の正極電極21と負極電極22との間に帯状のセパレータ23を介在させて、これらを捲回軸周りに渦捲き状に捲回して構成された捲回型としてもよい。
The number of the positive electrode 21 and the negative electrode 22 which comprise the electrode assembly 20 may be changed suitably.
The electrode assembly 20 is a winding type configured by interposing a strip-shaped separator 23 between a strip-shaped positive electrode 21 and a negative electrode 22 and winding them around a winding axis in a spiral manner. Also good.
○ ケース12,82の形状は、円柱状や、楕円柱状に形成してもよい。
○ 蓄電装置は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 case 12, 82 may be formed in a columnar shape or an elliptical column shape.
The power storage device may be embodied as a nickel hydride secondary battery or an electric double layer capacitor.
10,70,80…蓄電装置としての二次電池、12,82…ケース、14,84…蓋、14a…接触面としての内面、14b…挿通孔、14d,43c,91,92…凹部、19,79,109…押圧部材としての絶縁部材、20…電極組立体、24…筒状部、25,75…フランジ部、41,85…電極端子としての正極端子、42,86…電極端子としての負極端子、43,83…鍔部、43a…接触面としての座面、44…極柱部、44a…雄ねじ、50,81…介設部材としての端子カバー、51d,51e…接触面、55…締結部材としてのナット、81a,87,111,112…凸部。 10, 70, 80 ... secondary battery as power storage device, 12, 82 ... case, 14, 84 ... lid, 14a ... inner surface as contact surface, 14b ... insertion hole, 14d, 43c, 91, 92 ... recess, 19 79, 109 ... Insulating member as a pressing member, 20 ... Electrode assembly, 24 ... Cylindrical part, 25, 75 ... Flange part, 41, 85 ... Positive terminal as electrode terminal, 42, 86 ... As electrode terminal Negative terminal, 43, 83 ... collar, 43a ... seating surface as contact surface, 44 ... pole column, 44a ... male screw, 50, 81 ... terminal cover as interposition member, 51d, 51e ... contact surface, 55 ... Nuts as fastening members, 81a, 87, 111, 112 ... convex portions.
Claims (16)
少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、
前記極柱部に締結される締結部材と、
前記ケース内において前記挿通孔の周縁と前記鍔部との間に少なくとも一部分が配置される介設部材と
を有する蓄電装置であって、
当該蓄電装置は、
前記締結部材と前記鍔部との間で、前記ケースと前記鍔部とが前記介設部材を挟持させた状態で締結固定される締結固定構造と、
前記介設部材を挟持させた部分において前記ケースと前記介設部材と前記鍔部との相対移動を抑える移動抑制構造と、を有することを特徴とする蓄電装置。 A case in which an insertion hole communicating the inside and the outside is formed;
At least a portion has a pole column portion having a flange portion having a size larger than the inner diameter of the insertion hole, the flange portion is disposed in the case, and the pole column portion is disposed in the insertion hole. An electrode terminal provided on the case in a state where the tip of the pole post protrudes out of the case, and
A fastening member fastened to the pole post,
A power storage device having an interposed member disposed at least partially between a peripheral edge of the insertion hole and the flange in the case,
The power storage device
Between the fastening member and the flange portion, a fastening and fixing structure that is fastened and fixed in a state where the case and the flange portion sandwich the interposed member;
A power storage device comprising: a movement suppressing structure that suppresses relative movement between the case, the interposed member, and the flange in a portion where the interposed member is sandwiched.
少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、
前記極柱部に締結される締結部材と、
前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材と
を有する蓄電装置であって、
当該蓄電装置は、
前記締結部材と前記鍔部との間で、前記ケースと前記鍔部とが前記介設部材を挟持させた状態で締結固定される締結固定構造を有し、
前記介設部材を挟持させる部分において、前記ケースにおける前記介設部材との接触面は凹部を有し、
前記電極端子の前記鍔部における前記介設部材との接触面は凹部を有し、
前記介設部材の前記ケースとの接触面および前記鍔部との接触面において、前記ケースの凹部、及び前記鍔部の凹部に対向する場所には凸部を有しない形状に形成されていることを特徴とする蓄電装置。 A case in which an insertion hole communicating the inside and the outside is formed;
At least a portion has a pole column portion having a flange portion having a size larger than the inner diameter of the insertion hole, the flange portion is disposed in the case, and the pole column portion is disposed in the insertion hole. An electrode terminal provided on the case in a state where the tip of the pole post protrudes out of the case, and
A fastening member fastened to the pole post,
A power storage device having an interposed member at least a part of which is disposed between a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal,
The power storage device
Between the fastening member and the collar part, the case and the collar part have a fastening and fixing structure that is fastened and fixed in a state of sandwiching the interposed member,
In the portion for sandwiching the interposed member, the contact surface of the case with the interposed member has a recess,
The contact surface with the interposed member in the flange of the electrode terminal has a recess,
In the contact surface of the interposition member with the case and the contact surface with the flange, the concave portion of the case and the portion facing the recess of the flange are formed in a shape having no protrusion. A power storage device characterized by the above.
前記締結部材は前記雄ねじに螺合されている請求項2に記載の蓄電装置。 The pole portion has an external thread on the outer surface;
The power storage device according to claim 2, wherein the fastening member is screwed into the male screw.
少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、
前記極柱部に締結される締結部材と、
前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材と
を有する蓄電装置であって、
当該蓄電装置は、
前記締結部材と前記鍔部との間で、前記ケースと前記鍔部とが前記介設部材を挟持させた状態で締結固定される締結固定構造を有し、
前記ケース、前記介設部材、前記電極端子の順に硬度が変化する態様で、それら前記ケース、前記介設部材及び前記電極端子の形成材料が定められており、
前記ケースと前記介設部材との接触部分、及び前記介設部材と前記電極端子との接触部分において、前記形成材料の硬度が高いほうの部材は凸部を有することを特徴とする蓄電装置。 A case in which an insertion hole communicating the inside and the outside is formed;
At least a portion has a pole column portion having a flange portion having a size larger than the inner diameter of the insertion hole, the flange portion is disposed in the case, and the pole column portion is disposed in the insertion hole. An electrode terminal provided on the case in a state where the tip of the pole post protrudes out of the case, and
A fastening member fastened to the pole post,
A power storage device having an interposed member at least a part of which is disposed between a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal,
The power storage device
Between the fastening member and the collar part, the case and the collar part have a fastening and fixing structure that is fastened and fixed in a state of sandwiching the interposed member,
In the aspect in which the hardness changes in the order of the case, the interposed member, and the electrode terminal, the material for forming the case, the interposed member, and the electrode terminal is determined,
In the contact portion between the case and the interposed member, and the contact portion between the interposed member and the electrode terminal, the member having the higher hardness of the forming material has a convex portion.
前記締結部材は前記雄ねじに螺合されている請求項8〜請求項10のうちいずれか一項に記載の蓄電装置。 The pole portion has an external thread on the outer surface;
The power storage device according to any one of claims 8 to 10, wherein the fastening member is screwed into the male screw.
同押圧部材が前記ケースに接触している部分と前記介設部材を挟持させた部分とが、前記締結部材を前記極柱部に締結する方向においてオーバーラップしている請求項1〜請求項11のうちいずれか一項に記載の蓄電装置。 A pressing member is sandwiched between the fastening member and the case,
The portion where the pressing member is in contact with the case and the portion where the interposed member is sandwiched overlap each other in the direction in which the fastening member is fastened to the pole column. The electrical storage apparatus as described in any one of these.
少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、
前記極柱部に締結される締結部材と、
前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材と
を有する蓄電装置の製造方法であって、
前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に前記介設部材を挟持させる部分に、前記ケースと前記介設部材と前記電極端子との相対移動を抑える移動抑制構造を構成させて、
前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に介設部材を配置した状態で、前記締結部材を前記極柱部に締結して、前記ケースと前記電極端子とを締結固定する工程を含むことを特徴とする蓄電装置の製造方法。 A case in which an insertion hole communicating the inside and the outside is formed;
At least a portion has a pole column portion having a flange portion having a size larger than the inner diameter of the insertion hole, the flange portion is disposed in the case, and the pole column portion is disposed in the insertion hole. An electrode terminal provided on the case in a state where the tip of the pole post protrudes out of the case, and
A fastening member fastened to the pole post,
A method of manufacturing a power storage device comprising: an interposed member at least partially disposed between a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal,
A movement suppressing structure that suppresses relative movement between the case, the interposed member, and the electrode terminal at a portion that sandwiches the interposed member between a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal. Make up
In a state where an interposed member is disposed between the periphery of the insertion hole in the case and the flange portion of the electrode terminal, the fastening member is fastened to the pole column portion, and the case and the electrode terminal are The manufacturing method of the electrical storage apparatus characterized by including the process of fastening and fixing.
少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、
前記極柱部に締結される締結部材と、
前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材と、を有する蓄電装置の製造方法であって、
前記介設部材を挟持させる部分において、前記ケースにおける前記介設部材との接触面を凹部を有する形状に形成し、前記電極端子の前記鍔部における前記介設部材との接触面を凹部を有する形状に形成し、前記介設部材における前記ケースとの接触面および前記鍔部との接触面を前記ケースの凹部、及び前記鍔部の凹部に対向する場所に凸部を有しない形状に形成する第1工程と、
同第1工程の後に、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に介設部材を配置した状態で、前記締結部材を前記極柱部に締結して、前記ケースと前記電極端子とを締結固定する第2工程と、を含むことを特徴とする蓄電装置の製造方法。 A case in which an insertion hole communicating the inside and the outside is formed;
At least a portion has a pole column portion having a flange portion having a size larger than the inner diameter of the insertion hole, the flange portion is disposed in the case, and the pole column portion is disposed in the insertion hole. An electrode terminal provided on the case in a state where the tip of the pole post protrudes out of the case, and
A fastening member fastened to the pole post,
A method of manufacturing a power storage device comprising: an interposed member at least partially disposed between a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal,
In the part which clamps the said interposed member, the contact surface with the said interposed member in the said case is formed in the shape which has a recessed part, and the contact surface with the said interposed member in the said collar part of the said electrode terminal has a recessed part The contact member is formed in a shape, and the contact surface with the case and the contact surface with the flange portion of the interposed member are formed in a shape that does not have a convex portion at a position facing the recess portion of the case and the recess portion of the flange portion. The first step;
After the first step, the fastening member is fastened to the pole column portion with an interposed member disposed between the periphery of the insertion hole in the case and the flange portion of the electrode terminal, And a second step of fastening and fixing the case and the electrode terminal.
少なくとも一部が前記挿通孔の内径よりも大きい寸法である鍔部を備えた極柱部を有し、前記鍔部を前記ケース内に配置した状態であり、且つ前記挿通孔に前記極柱部を挿通した状態であり、且つ前記極柱部の先端が前記ケース外に突出した状態で前記ケースに設けられた電極端子と、
前記極柱部に締結される締結部材と、
前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に少なくとも一部分が配置される介設部材と、を有する蓄電装置の製造方法であって、
前記ケース、前記介設部材、前記電極端子の順に硬度が変化する態様で、それら前記ケース、前記介設部材及び前記電極端子の形成材料が定められており、
前記ケースと前記介設部材との接触部分、及び前記介設部材と前記電極端子との接触部分において、前記形成材料の硬度が高いほうの部材を凸部を有する形状に形成し、前記形成材料の硬度が低いほうの部材を凹部を有しない形状に形成する前工程と、
同前工程の後に、前記ケースにおける前記挿通孔の周縁と前記電極端子の前記鍔部との間に介設部材を配置した状態で、前記締結部材を前記極柱部に締結して、前記ケースと前記電極端子とを締結固定する後工程と、を含むことを特徴とする蓄電装置の製造方法。 A case in which an insertion hole communicating the inside and the outside is formed;
At least a portion has a pole column portion having a flange portion having a size larger than the inner diameter of the insertion hole, the flange portion is disposed in the case, and the pole column portion is disposed in the insertion hole. An electrode terminal provided on the case in a state where the tip of the pole post protrudes out of the case, and
A fastening member fastened to the pole post,
A method of manufacturing a power storage device comprising: an interposed member at least partially disposed between a peripheral edge of the insertion hole in the case and the flange portion of the electrode terminal,
In the aspect in which the hardness changes in the order of the case, the interposed member, and the electrode terminal, the material for forming the case, the interposed member, and the electrode terminal is determined,
In the contact portion between the case and the interposed member, and the contact portion between the interposed member and the electrode terminal, the member having a higher hardness of the forming material is formed into a shape having a convex portion, and the forming material A pre-process for forming a member having a lower hardness into a shape having no recess,
After the preceding step, the fastening member is fastened to the pole column portion with an interposed member disposed between the periphery of the insertion hole in the case and the flange portion of the electrode terminal, and the case And a post-process for fastening and fixing the electrode terminal to the electrode terminal.
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JP2018190591A (en) * | 2017-05-02 | 2018-11-29 | トヨタ自動車株式会社 | Terminal fixing structure |
US11996585B2 (en) | 2019-02-21 | 2024-05-28 | Lg Energy Solution, Ltd. | Battery module including terminal connecting structure provided with floating nut and battery pack including the same |
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