JP6098740B2

JP6098740B2 - battery

Info

Publication number: JP6098740B2
Application number: JP2016006650A
Authority: JP
Inventors: 勝彦岡本; 雅和 ▲堤▼; 伸介吉竹; 佐々木　丈; 丈佐々木
Original assignee: GS Yuasa International Ltd
Current assignee: GS Yuasa International Ltd
Priority date: 2016-01-15
Filing date: 2016-01-15
Publication date: 2017-03-22
Anticipated expiration: 2028-10-15
Also published as: JP2016096154A

Description

本発明は、発電要素を収納した電池容器の上端開口部を塞ぐ蓋板に端子を設けた電池に関するものである。 The present invention relates to a battery in which a terminal is provided on a lid plate that closes an upper end opening of a battery container that houses a power generation element.

図６に従来の大型の非水電解質二次電池の端子の取り付け構造を示す（例えば、特許文献１の第６図〜第８図参照。）。この非水電解質二次電池は、電池容器１内に長円筒形の巻回型の発電要素２を収納し、電池容器１の上端開口部を蓋板３で塞いで密閉したものである。発電要素２には、左右の端部に電極の金属箔２ａ、２ａが巻回された巻き束状のままはみ出していて、これらの金属箔２ａ、２ａには集電接続体５、５が接続されている。また、蓋板３には、左右の端部に外部端子４、４が取り付けられている。 FIG. 6 shows a terminal mounting structure of a conventional large nonaqueous electrolyte secondary battery (see, for example, FIGS. 6 to 8 of Patent Document 1). This non-aqueous electrolyte secondary battery is a battery container 1 in which a long cylindrical wound power generation element 2 is housed, and the upper end opening of the battery container 1 is closed with a cover plate 3 and sealed. The power generation element 2 protrudes in the form of a bundle of metal foils 2a and 2a wound around the left and right ends, and current collector connectors 5 and 5 are connected to these metal foils 2a and 2a. Has been. In addition, external terminals 4 and 4 are attached to the left and right ends of the lid plate 3.

外部端子４は、高さの低い円柱状の台座部４ａの上面からボルト部４ｂが上方に突設されると共に、この台座部４ａの下面からかしめ筒４ｃが下方に突設されたものである。そして、正極側と負極側の外部端子４、４のかしめ筒４ｃ、４ｃは、蓋板３の左右端部の上面に配置された外部絶縁封止材６、６の貫通孔と、蓋板３の左右端部の端子引出貫通孔３ａ、３ａと、蓋板３の左右端部の下面に配置された内部絶縁封止材７、７の貫通孔を通して、この蓋板３の上方から電池容器１内に嵌入すると共に、集電接続体５、５の上部の水平に折り曲がった接続部５ａ、５ａに形成された貫通孔にも通して下方からかしめられる。従って、外部端子４は、かしめ筒４ｃがかしめによって集電接続体５に接続され、発電要素２の電極の金属箔２ａにも接続されると共に、絶縁封止材６、７を介して蓋板３を挟持するので、この蓋板３に絶縁封止された状態で固着されることになる。 The external terminal 4 has a bolt portion 4b projecting upward from an upper surface of a columnar pedestal portion 4a having a low height, and a caulking tube 4c projecting downward from a lower surface of the pedestal portion 4a. . The caulking cylinders 4 c and 4 c of the external terminals 4 and 4 on the positive electrode side and the negative electrode side are provided with through holes of the external insulating sealing materials 6 and 6 disposed on the upper surfaces of the left and right ends of the cover plate 3, and the cover plate 3. The battery container 1 from above the cover plate 3 through the terminal lead-out through holes 3a, 3a at the left and right ends of the cover plate and the through holes of the internal insulating sealing materials 7, 7 disposed on the lower surfaces of the left and right ends of the cover plate 3. In addition to being fitted in, it is also caulked from below through the through holes formed in the horizontally bent connection portions 5a, 5a of the upper portions of the current collector connection bodies 5, 5. Therefore, the external terminal 4 is connected to the current collector connection body 5 by caulking cylinder 4c by caulking, and is also connected to the metal foil 2a of the electrode of the power generating element 2, and the lid plate via the insulating sealing materials 6 and 7 3 is sandwiched, it is fixed to the lid plate 3 in an insulated and sealed state.

ところが、このような外部端子４の取り付け構造では、非水電解質二次電池を外部機器と接続するためにリード線の圧着端子等を外部端子４のボルト部４ｂに嵌めてナット等で締め付けた場合、特にこのようなナット等の着脱を繰り返した場合に、締め付けトルクがかしめ筒４ｃのかしめ部に直接加わり、集電接続体５の接続部５ａとのかしめが緩んで外部端子４だけが空転するおそれがある。そして、外部端子４が空転すると、集電接続体５との接触電気抵抗が大きくなって電池性能が低下するだけでなく、絶縁封止材６、７との間にも隙間が生じて電池容器１内の密閉が不完全になるという問題が生じる。 However, in such an external terminal 4 mounting structure, when a non-aqueous electrolyte secondary battery is connected to an external device, a lead wire crimp terminal or the like is fitted to the bolt portion 4b of the external terminal 4 and tightened with a nut or the like. In particular, when such attachment and detachment of a nut or the like is repeated, the tightening torque is directly applied to the caulking portion of the caulking cylinder 4c, the caulking with the connection portion 5a of the current collector connection body 5 is loosened, and only the external terminal 4 is idled. There is a fear. When the external terminal 4 idles, not only does the contact electrical resistance with the current collector connector 5 increase and the battery performance deteriorates, but also a gap is formed between the insulating sealing materials 6 and 7 and the battery container. There arises a problem that the sealing inside 1 is incomplete.

しかも、非水電解質二次電池の場合、正極側の外部端子４にアルミニウム合金が用いられることが多いので、ボルト部４ｂをナット等で強く締め付けたり、このようなナット等の着脱を繰り返すと、このボルト部４ｂのねじ山が破損するという問題もあった。 Moreover, in the case of a non-aqueous electrolyte secondary battery, since an aluminum alloy is often used for the external terminal 4 on the positive electrode side, if the bolt portion 4b is strongly tightened with a nut or the like, and such attachment and detachment of such a nut is repeated, There was also a problem that the screw thread of this bolt part 4b was damaged.

そこで、従来は、外部端子４の台座部４ａを横断面が四角形や六角形等の多角柱状とし、外部絶縁封止材６にも同様の形状の外部端子凹部を設け、この外部絶縁封止材６の外部端子凹部に台座部４ａを嵌合させて外部端子４の回り止めを行わせようという提案もあった（例えば、特許文献１の第１図〜第５図参照。）。 Therefore, conventionally, the pedestal portion 4a of the external terminal 4 has a polygonal columnar shape such as a square or hexagonal cross section, and the external insulating sealing material 6 is also provided with an external terminal recess having the same shape. There has also been a proposal to prevent the external terminal 4 from rotating by fitting the pedestal 4a into the external terminal recess 6 (see, for example, FIGS. 1 to 5 of Patent Document 1).

しかしながら、このような外部端子４の取り付け構造でも、台座部４ａと外部絶縁封止材６の外部端子凹部との嵌合の若干の隙間によって外部端子４が僅かな角度だけ空転するおそれがあり、かしめ筒４ｃと集電接続体５の接続部５ａとのかしめが緩むのを完全に防ぐことはできないという問題がある。しかも、ボルト部４ｂをナット等で締め付けたときの締め付けトルクは、外部絶縁封止材６にも直接加わることになり、この外部絶縁封止材６に大きなストレスがかかって気密性が損なわれるおそれがあるという問題も生じる。 However, even with such an external terminal 4 mounting structure, there is a possibility that the external terminal 4 may idle by a slight angle due to a slight gap between the pedestal 4a and the external terminal recess of the external insulating sealing material 6. There is a problem that the caulking between the caulking cylinder 4c and the connecting portion 5a of the current collector connector 5 cannot be completely prevented. Moreover, the tightening torque when the bolt portion 4b is tightened with a nut or the like is also directly applied to the external insulating sealing material 6, and the external insulating sealing material 6 may be subjected to a great stress and airtightness may be impaired. There is also a problem that there is.

このため、従来は図７に示すような外部端子４の取り付け構造も提案されていた（例えば、特許文献２参照。）。この場合の外部端子４は、台座部４ａが六角柱状に形成されると共に、この台座部４ａの上面からはボルト部４ｂが突設されるが、下面にはかしめ筒が突設されない。また、外部絶縁封止材６の上面にも同様の六角形の外部端子凹部６ａを設け、この外部端子凹部６ａに台座部４ａを嵌合させて外部端子４の回り止めを行わせようにしている。 For this reason, the attachment structure of the external terminal 4 as shown in FIG. 7 has also been proposed (see, for example, Patent Document 2). In the external terminal 4 in this case, the pedestal portion 4a is formed in a hexagonal column shape, and the bolt portion 4b protrudes from the upper surface of the pedestal portion 4a, but the caulking tube does not protrude from the lower surface. Further, a similar hexagonal external terminal recess 6a is also provided on the upper surface of the external insulating sealing material 6, and the pedestal 4a is fitted into the external terminal recess 6a to prevent the external terminal 4 from rotating. Yes.

上記外部絶縁封止材６の上面には、補助端子凹部６ｂも設けられ、この補助端子凹部６ｂには、補助端子８の台座部８ａが嵌合するようになっている。補助端子８は、台座部８ａの下面から第１かしめ筒８ｂが下方に突設されると共に、この台座部８ａの上面から第２かしめ筒８ｃが上方に突設されたものである。そして、正極側と負極側の補助端子８、８の第１かしめ筒８ｂ、８ｂは、外部絶縁封止材６、６の補助端子凹部６ｂ、６ｂの底面に形成された貫通孔と、蓋板３の左右端部の端子引出貫通孔３ａ、３ａと、内部絶縁封止材７、７の貫通孔を通して、この蓋板３の上方から電池容器１内に嵌入すると共に、集電接続体５、５の接続部５ａ、５ａに形成された貫通孔にも通して下方からかしめられる。従って、補助端子８は、第１かしめ筒８ｂと集電接続体５の接続部５ａとのかしめによる接続部を介して発電要素２の金属箔２ａに接続されると共に、絶縁封止材６、７を介して蓋板３を挟持するので、この蓋板３に対して絶縁封止された状態で固着されることになる。 An auxiliary terminal recess 6b is also provided on the upper surface of the external insulating sealing material 6, and a pedestal portion 8a of the auxiliary terminal 8 is fitted into the auxiliary terminal recess 6b. The auxiliary terminal 8 has a first caulking tube 8b projecting downward from the lower surface of the pedestal portion 8a and a second caulking tube 8c projecting upward from the upper surface of the pedestal portion 8a. The first caulking cylinders 8b and 8b of the auxiliary terminals 8 and 8 on the positive electrode side and the negative electrode side have through holes formed on the bottom surfaces of the auxiliary terminal recesses 6b and 6b of the external insulating sealing materials 6 and 6, and a cover plate 3 is inserted into the battery case 1 from above the cover plate 3 through the terminal lead-out through holes 3a and 3a at the left and right end portions of the cover 3 and the through holes of the internal insulating sealing materials 7 and 7, and the current collecting connector 5, 5 is also caulked from below through the through holes formed in the connecting portions 5a and 5a. Accordingly, the auxiliary terminal 8 is connected to the metal foil 2a of the power generating element 2 through a connection portion by caulking between the first caulking tube 8b and the connection portion 5a of the current collector connection body 5, and the insulating sealing material 6, Since the lid plate 3 is sandwiched via 7, the lid plate 3 is fixed to the lid plate 3 while being insulated and sealed.

また、上記補助端子８の第２かしめ筒８ｃと外部端子４のボルト部４ｂには、接続導体９が取り付けられる。接続導体９は、ほぼ長方形状の板材であり、一端部にはかしめ孔９ａが形成されると共に、他端部には端子貫通孔９ｂが形成されている。そして、この接続導体９は、端子貫通孔９ｂに外部端子４のボルト部４ｂが下方から挿入されると共に、かしめ孔９ａに補助端子８の第２かしめ筒８ｃが下方から挿入されて上方からかしめられる。従って、外部端子４は、外部機器との接続のためにボルト部４ｂをナット等で締め付けると、接続導体９を介して補助端子８に接続固定され、これによって発電要素２の電極の金属箔２ａにも接続されることになる。 A connection conductor 9 is attached to the second caulking cylinder 8 c of the auxiliary terminal 8 and the bolt part 4 b of the external terminal 4. The connection conductor 9 is a substantially rectangular plate material. A caulking hole 9a is formed at one end, and a terminal through hole 9b is formed at the other end. The connecting conductor 9 has a bolt portion 4b of the external terminal 4 inserted into the terminal through hole 9b from below, and a second caulking tube 8c of the auxiliary terminal 8 inserted into the caulking hole 9a from below so as to be caulked from above. It is done. Therefore, the external terminal 4 is connected and fixed to the auxiliary terminal 8 via the connection conductor 9 when the bolt portion 4b is tightened with a nut or the like for connection with an external device, and thereby the metal foil 2a of the electrode of the power generation element 2 is fixed. Will also be connected to.

このような外部端子４の取り付け構造を用いれば、ボルト部４ｂをナット等で締め付けても、締め付けトルクは補助端子８には直接加わらないので、集電接続体５の接続部５ａとのかしめが緩むようなおそれはなくなる。しかも、非水電解質二次電池の場合であっても、正極側の補助端子８だけにアルミニウム合金を用い、外部端子４には鉄やステンレス等の綱、その他の強度の高い金属材を用いることができるので、ナット等の締め付けによってボルト部４ｂのねじ山が破損するようなこともなくなる。 If such an external terminal 4 mounting structure is used, the tightening torque is not directly applied to the auxiliary terminal 8 even if the bolt portion 4b is tightened with a nut or the like. There is no risk of loosening. Moreover, even in the case of a non-aqueous electrolyte secondary battery, an aluminum alloy is used only for the auxiliary terminal 8 on the positive electrode side, and a steel such as iron or stainless steel or other high-strength metal material is used for the external terminal 4. Therefore, the screw thread of the bolt part 4b is not damaged by tightening a nut or the like.

なお、外部端子の台座部に凸部を設け、この凸部を樹脂製の蓋板の凹穴に挿入して外部端子の回り止めを行う発明も従来から提案されている（例えば、特許文献３参照。）。しかしながら、外部端子に締め付けトルクが加わると、凸部と凹穴との係合のみによって回り止めを行うので、この係合の若干の隙間によって外部端子が僅かな角度だけ空転するおそがあり、発電要素の電極との間の接続が損なわれるのを十分に防ぐことはできない。
特開２００１−３５７８３３号公報特開２００３−３４６７７４号公報（第２頁、第３図）特開平１０−１２５２９１号公報 In addition, an invention in which a convex portion is provided on a pedestal portion of an external terminal and the convex portion is inserted into a concave hole of a resin lid plate to prevent rotation of the external terminal has been conventionally proposed (for example, Patent Document 3). reference.). However, when tightening torque is applied to the external terminal, the rotation is stopped only by the engagement between the convex portion and the concave hole, so that there is a possibility that the external terminal will idle by a slight angle due to a slight gap of this engagement. The connection between the element electrodes cannot be sufficiently prevented.
JP 2001-357833 A JP 2003-346774 A (2nd page, FIG. 3) JP-A-10-125291

ところが、発明者らがさらに検討を重ねたところ、上述したような外部端子４の取り付け構造であっても、ボルト部４ｂをナット等で締め付けると、締め付けトルクは外部絶縁封止材６の外部端子凹部６ａに直接加わるので、補助端子８の第１かしめ筒８ｂをかしめることにより蓋板３との間の封止を行う外部絶縁封止材６に大きなストレスがかかって高いレベルでの気密性が損なわれるのを確実に避けることができないという問題があることを見いだした。即ち、外部絶縁封止材６は、蓋板３の上面に強く圧迫される他に、ねじれ方向の大きな力を受けるので、素材の僅かな変形によって蓋板３との界面に微小な隙間を生じて密閉が不完全になるおそれが生じるのである。また、この外部絶縁封止材６が蓋板３に対して回り止めがなされていても、この回り止めとの間の若干の隙間によって外部絶縁封止材６自体が僅かに位置ずれするおそれがあり、これによって蓋板３との界面に微小な隙間を生じて密閉が不完全になるおそれが生じるのである。 However, as a result of further investigations by the inventors, even when the external terminal 4 is attached as described above, when the bolt portion 4b is tightened with a nut or the like, the tightening torque is external terminal of the external insulating sealing material 6. Since it is directly applied to the recess 6a, a large level of stress is applied to the external insulating sealing material 6 that seals between the cover plate 3 by caulking the first caulking cylinder 8b of the auxiliary terminal 8, and airtightness at a high level. I have found that there is a problem that it cannot be surely avoided that it is damaged. That is, the external insulating sealing material 6 is strongly pressed against the upper surface of the lid plate 3 and receives a large force in the twisting direction, so that a slight gap in the material causes a minute gap at the interface with the lid plate 3. As a result, the sealing may be incomplete. Further, even if the external insulating sealing material 6 is prevented from rotating with respect to the cover plate 3, the external insulating sealing material 6 itself may be slightly displaced due to a slight gap between the external insulating sealing material 6 and the cover plate 3. There is a possibility that a minute gap is formed at the interface with the cover plate 3 and the sealing is incomplete.

このため、補助端子の封止のための外部絶縁封止材とは分離された回り止め部材によって外部端子の回り止めを行うことにより、この外部端子の締め付けトルクが気密性や導電性を損なうようなおそれのない電池を提供しようとされている。
一方、本発明は、外部端子のボルト部やねじ穴のねじ山が破損するのを防止することができる電池を提供するものである。 For this reason, the external terminal is prevented from rotating by a rotation preventing member separated from the external insulating sealing material for sealing the auxiliary terminal, so that the tightening torque of the external terminal impairs airtightness and conductivity. Furthermore, it is trying to provide a battery without it.
On the other hand, the present invention is to provide a batteries that can thread the bolt portion and the screw holes of the external terminals can be prevented from being damaged.

本願の第１の発明は、発電要素と、前記発電要素を収納した電池容器と、前記電池容器の上端開口部を塞ぐ蓋板と、前記蓋板の端子引出貫通孔を通して下部が前記電池容器内部に貫入し前記発電要素の電極に接続されると共に、前記蓋板に封止材を介して封止固着された補助端子と、前記補助端子の上部に一部が接続固定されると共に、他の部位に端子接続部が形成された接続導体と、台座部と前記台座部の上方に突出するボルト部とを備え、前記接続導体の前記端子接続部に前記ボルト部を接続させた外部端子と、前記蓋板上で前記外部端子の前記台座部を係止する回り止め部材と、前記ボルト部に螺着されたナットと、を備え、前記補助端子は、正極端子側の補助端子と、負極端子側の補助端子と、を有し、前記正極端子側の補助端子は、アルミニウム又はアルミニウム合金からなり、前記負極端子側の補助端子は、銅又は銅合金からなり、前記外部端子は、鉄又は鋼からなり、前記回り止め部材は、前記蓋板の上面に固着されていることを特徴とする。
本願の第２の発明は、発電要素を収納した電池容器の上端開口部を蓋板で塞いだ電池において、蓋板の端子引出貫通孔を通して下部が電池容器内部に貫入し発電要素の電極に接続されると共に、この蓋板に封止材を介して封止固着された補助端子と、補助端子の上部に一部が接続固定されると共に、他の部位に端子接続部が形成された接続導体と、台座部とこの台座部の上方に突出するボルト部とを備え、接続導体の端子接続部にこのボルト部を接続させた外部端子と、蓋板上で外部端子の台座部を係止する回り止め部材とを備えたことを特徴とする。 According to a first aspect of the present invention , a power generation element, a battery container housing the power generation element, a lid plate that closes an upper end opening of the battery container, and a lower portion through the terminal lead-through hole of the lid plate are inside the battery container. An auxiliary terminal that is sealed and fixed to the lid plate via a sealing material, and a part of the auxiliary terminal is connected and fixed to the upper portion of the auxiliary terminal. A connection conductor in which a terminal connection portion is formed at a site; a pedestal portion; and a bolt portion protruding above the pedestal portion; and an external terminal connecting the bolt portion to the terminal connection portion of the connection conductor; A detent member for locking the pedestal portion of the external terminal on the lid plate; and a nut screwed to the bolt portion, the auxiliary terminal including an auxiliary terminal on the positive electrode terminal side, and a negative electrode terminal An auxiliary terminal on the side, and the auxiliary terminal on the positive terminal side is The auxiliary terminal on the negative electrode terminal side is made of copper or a copper alloy, the external terminal is made of iron or steel, and the anti-rotation member is fixed to the upper surface of the lid plate. a feature that.
In the second invention of the present application, in the battery in which the upper end opening of the battery container containing the power generation element is covered with the cover plate, the lower part penetrates into the inside of the battery container through the terminal lead through hole of the cover plate and is connected to the electrode of the power generation element And an auxiliary terminal sealed and fixed to the lid plate via a sealing material, and a connection conductor in which a part of the auxiliary terminal is connected and fixed to the upper portion of the auxiliary terminal and a terminal connection portion is formed in another part. A pedestal portion and a bolt portion protruding above the pedestal portion, the external terminal having the bolt portion connected to the terminal connection portion of the connection conductor, and the pedestal portion of the external terminal being locked on the cover plate And a detent member.

本願の第３の発明は、前記電池において、接続導体に代えて、補助端子に、この補助端子の上部から引き出され、この引き出された部分に端子接続部が形成された接続導体部が設けられたことを特徴とする。 According to a third invention of the present application, in the battery, in place of the connection conductor, the auxiliary terminal is provided with a connection conductor portion that is drawn from an upper portion of the auxiliary terminal, and a terminal connection portion is formed in the drawn portion. It is characterized by that.

本願の第４の発明は、前記外部端子の台座部が、底面に上方に向けて、ボルト部の軸線に対して回転体でない形状の凹部が形成されたものであり、前記回り止め部材が、底面を蓋板上に固着された上方に突出する樹脂製の柱体であって、台座部の凹部に嵌合する横断面形状を有するものであり、この横断面形状の柱体を台座部の凹部に嵌合させることにより、ボルト部の軸線を中心とした外部端子の回転を制限するものであることを特徴とする。 According to a fourth aspect of the present invention, the pedestal portion of the external terminal is formed with a concave portion having a shape that is not a rotating body with respect to the axis of the bolt portion facing upward on the bottom surface. It is a resin-made columnar body that is fixed on the cover plate and protrudes upward, and has a cross-sectional shape that fits into the recess of the pedestal portion. By fitting in the recess, rotation of the external terminal around the axis of the bolt portion is limited.

本願の第５の発明は、前記外部端子の台座部が、ボルト部の軸線に対して回転体でない横断面形状の柱体からなり、前記回り止め部材が、底面を蓋板上に固着され、上面に下方に向けて、台座部に嵌合する形状の凹部が形成された樹脂製の部材であり、この凹部に台座部を嵌合させることにより、ボルト部の軸線を中心とした外部端子の回転を制限するものであることを特徴とする。 According to a fifth aspect of the present invention, the pedestal portion of the external terminal is formed of a column having a cross-sectional shape that is not a rotating body with respect to the axis of the bolt portion, and the anti-rotation member is fixed to the lid plate with the bottom surface, It is a resin-made member in which a concave portion that is shaped to fit into the pedestal portion is formed on the upper surface downward. By fitting the pedestal portion into this concave portion, the external terminal centered on the axis of the bolt portion It is characterized by limiting rotation.

本願の第６の発明は、前記電池において、外部端子が、ボルト部に代えて、台座部から上方に突出し、この突出上端面に下方を向くねじ穴が穿設された突出部を有することを特徴とする。 According to a sixth invention of the present application, in the battery, the external terminal has a protruding portion that protrudes upward from the pedestal portion instead of the bolt portion, and has a screw hole that is directed downward on the protruding upper end surface. Features.

本願の第７の発明は、前記電池が非水電解質二次電池であり、正極端子側の前記補助端子がアルミニウム又はアルミニウム合金からなり、負極端子側の前記補助端子が銅又は銅合金からなり、外部端子が鉄又は鋼からなることを特徴とする。 In a seventh invention of the present application, the battery is a nonaqueous electrolyte secondary battery, the auxiliary terminal on the positive electrode terminal side is made of aluminum or an aluminum alloy, and the auxiliary terminal on the negative electrode terminal side is made of copper or a copper alloy, The external terminal is made of iron or steel.

本願の第１の発明によれば、外部端子のボルト部やねじ穴のねじ山が破損するのを防止することができる。
本願の第２の発明によれば、外部機器に接続される外部端子と電池容器の内部で発電要素の電極に接続される補助端子とが接続導体を介して間接的に接続されることにより、部品としては分離されているので、外部端子のボルト部に加わる締め付けトルクが補助端子にも加わるということがなくなり、補助端子と蓋板との間の封止材による封止が損なわれるおそれが生じないだけでなく、この補助端子と発電要素の電極との間の接続が損なわれるおそれも生じない。また、補助端子と蓋板との間の封止材と外部端子の回り止めを行う回り止め部材とが部品として分離されているので、外部端子の空転は回り止め部材によって制限され、しかも、外部端子のボルト部に加わった締め付けトルクが補助端子と蓋板との間の封止を損なうおそれも生じない。 According to 1st invention of this application, it can prevent that the bolt part of an external terminal and the thread of a screw hole are damaged.
According to the second invention of the present application, the external terminal connected to the external device and the auxiliary terminal connected to the electrode of the power generation element inside the battery container are indirectly connected via the connection conductor, Since the parts are separated, the tightening torque applied to the bolt portion of the external terminal is not applied to the auxiliary terminal, and the sealing with the sealing material between the auxiliary terminal and the cover plate may be impaired. In addition, there is no possibility that the connection between the auxiliary terminal and the electrode of the power generation element is impaired. In addition, since the sealing material between the auxiliary terminal and the cover plate and the anti-rotation member that prevents the external terminal from rotating are separated as parts, the idling of the external terminal is limited by the anti-rotation member, and There is no possibility that the tightening torque applied to the bolt portion of the terminal impairs the sealing between the auxiliary terminal and the cover plate.

なお、接続導体の端子接続部は、外部端子のボルト部が下方から貫通するような端子貫通孔であることが好ましい。また、回り止め部材は、蓋板上に固着されたものであることが好ましい。 In addition, it is preferable that the terminal connection part of a connection conductor is a terminal through-hole which the bolt part of an external terminal penetrates from the downward direction. Moreover, it is preferable that the anti-rotation member is fixed on the cover plate.

本願の第３の発明によれば、接続導体の一部をかしめ等により補助端子に接続固定する作業工数と部品点数を削減することができる。 According to the third invention of the present application, it is possible to reduce the number of work steps and the number of parts for connecting and fixing a part of the connection conductor to the auxiliary terminal by caulking or the like.

本願の第４の発明によれば、外部端子の台座部の凹部に回転体でない横断面形状の回り止め部材が嵌合するので、外部端子の回り止めを確実に行うことができる。 According to the fourth aspect of the present invention, since the non-rotating member having a cross-sectional shape that is not a rotating body is fitted into the recess of the pedestal portion of the external terminal, it is possible to reliably prevent the external terminal from rotating.

本願の第５の発明によれば、回転体でない横断面形状の外部端子の台座部が回り止め部材の凹部に嵌合するので、外部端子の回り止めを確実に行うことができる。 According to the fifth invention of the present application, since the pedestal portion of the external terminal having a cross-sectional shape that is not a rotating body is fitted into the concave portion of the rotation preventing member, the rotation of the external terminal can be reliably performed.

本願の第６の発明によれば、ボルト部に代えてねじ穴が穿設された外部端子の場合にも同様の効果を得ることができる。 According to the sixth invention of the present application, the same effect can be obtained also in the case of an external terminal in which a screw hole is formed instead of the bolt portion.

本願の第７の発明によれば、外部機器との接続のためのナット等による締め付けが、強度の弱いアルミニウム等からなる補助端子ではなく、強度の強い鉄等からなる外部端子で行われるので、この外部端子のボルト部やねじ穴のねじ山が破損するのを防止することができる。 According to the seventh invention of the present application, tightening with a nut or the like for connection with an external device is performed not with an auxiliary terminal made of weak aluminum or the like but with an external terminal made of strong iron or the like, It is possible to prevent the bolt portion of the external terminal and the screw thread of the screw hole from being damaged.

以下、本発明の最良の実施形態について図１〜図５を参照して説明する。なお、これらの図においても、図６〜図７に示した従来例と同様の機能を有する構成部材には同じ番号を付記する。 Hereinafter, the best embodiment of the present invention will be described with reference to FIGS. In these drawings, the same reference numerals are given to constituent members having functions similar to those of the conventional example shown in FIGS.

本実施形態は、図６〜図７に示した従来例と同様に、大型の非水電解質二次電池について説明する。この非水電解質二次電池は、図１及び図２に示すように、電池容器１内に長円筒形の巻回型の発電要素２を収納し、電池容器１の上端開口部を蓋板３で塞いで密閉したものである。 In the present embodiment, a large non-aqueous electrolyte secondary battery will be described in the same manner as the conventional example shown in FIGS. As shown in FIGS. 1 and 2, this non-aqueous electrolyte secondary battery includes a battery container 1 that houses a long cylindrical wound power generation element 2, and the upper end opening of the battery container 1 is covered with a cover plate 3. It is closed and sealed.

発電要素２は、帯状の電極である正極と負極をセパレータを介し左右の異なる方向にずらして、左右方向の回転軸を中心に上下に長円となる長円筒形に巻回したものである。正極は、アルミニウム箔の表面に正極活物質を担持させたものであり、負極は、銅箔の表面に負極活物質を担持させたものであるが、それぞれ左右のずらす方向の端縁部を活物質の未塗工部とすることによりアルミニウム箔や銅箔が露出するようになっている。従って、発電要素２の左右の端部には、これら電極の金属箔２ａ、２ａが巻回された巻き束状のままはみ出している。 The power generation element 2 is formed by shifting a positive electrode and a negative electrode, which are band-shaped electrodes, in different directions on the left and right sides through a separator, and winding them into a long cylindrical shape that forms an ellipse vertically around a rotation axis in the left-right direction. The positive electrode has a positive electrode active material supported on the surface of an aluminum foil, and the negative electrode has a negative electrode active material supported on the surface of a copper foil. An aluminum foil or a copper foil is exposed by setting the uncoated portion of the substance. Accordingly, the left and right ends of the power generation element 2 protrude as a wound bundle in which the metal foils 2a and 2a of these electrodes are wound.

上記発電要素２の左右の端部にはみ出した金属箔２ａ、２ａには、それぞれ集電接続体５、５が接続されている。集電接続体５は、正極側ではアルミニウム又はアルミニウム合金からなり、負極側では銅又は銅合金からなる上下に長い導電金属板であり、上部は水平に折り曲げられると共に貫通孔が形成されて接続部５ａとなり、この接続部５ａより下方の部分は前後に二股に分けられて下方に突出している。そして、この集電接続体５の下方の二股に分けられた部分が発電要素２の金属箔２ａと共に挟持板に挟まれて超音波溶接等により接続固定される。 Current collector connectors 5 and 5 are connected to the metal foils 2a and 2a protruding from the left and right ends of the power generating element 2, respectively. The current collector connection body 5 is made of aluminum or an aluminum alloy on the positive electrode side, and is a vertically long conductive metal plate made of copper or a copper alloy on the negative electrode side. The upper part is bent horizontally and a through hole is formed in the connection part. 5a, and the portion below the connecting portion 5a is divided into two parts in the front and rear and protrudes downward. And the part divided into the fork lower part of this current collection connection body 5 is pinched | interposed into a clamping plate with the metal foil 2a of the electric power generation element 2, and is connected and fixed by ultrasonic welding etc.

電池容器１と蓋板３は、アルミニウム合金や鋼等からなり、電池容器１は左右方向に長い方形の金属容器であり、蓋板３は、左右に細長い方形の金属板である。そして、この蓋板３は、後に電池容器１の上端開口部に嵌め込まれてレーザ溶接等により内部を密閉することになる。 The battery container 1 and the cover plate 3 are made of aluminum alloy, steel, or the like. The battery container 1 is a rectangular metal container that is long in the left-right direction, and the cover plate 3 is a rectangular metal plate that is elongated in the left-right direction. And this cover plate 3 is inserted in the upper end opening part of the battery container 1 later, and the inside is sealed by laser welding or the like.

上記蓋板３には、左右の端部に端子引出貫通孔３ａ、３ａ（左側の端子引出貫通孔３ａは部品の陰になって見えない）が開口され、ここに外部絶縁封止材６、６と内部絶縁封止材７、７を介して補助端子８、８が取り付けられる。補助端子８は、正極側ではアルミニウム又はアルミニウム合金からなり、負極側では銅又は銅合金からなる導電金属部品である。この補助端子８は、高さが低い八角柱状の台座部８ａの下面から第１かしめ筒８ｂが下方に突設されると共に、この台座部８ａの上面から第２かしめ筒８ｃが上方に突設されている。 The lid plate 3 has terminal lead-through holes 3a and 3a (the left terminal lead-through hole 3a is not visible behind the parts) at the left and right ends, and the external insulating sealing material 6, Auxiliary terminals 8 and 8 are attached via 6 and internal insulating sealing materials 7 and 7. The auxiliary terminal 8 is a conductive metal part made of aluminum or an aluminum alloy on the positive electrode side and made of copper or a copper alloy on the negative electrode side. The auxiliary terminal 8 has a first caulking tube 8b protruding downward from the lower surface of the octagonal columnar pedestal portion 8a having a low height, and a second caulking tube 8c protruding upward from the upper surface of the pedestal portion 8a. Has been.

外部絶縁封止材６と内部絶縁封止材７は、絶縁性と封止性を備えた合成樹脂からなる。外部絶縁封止材６は、補助端子８の台座部８ａよりは一回り大きい八角柱体からなり、上面にこの台座部８ａが嵌合する形状の補助端子凹部６ｂが設けられている。また、この外部絶縁封止材６には、補助端子凹部６ｂの底面に貫通孔が形成されると共に、この貫通孔の下面開口部はスリーブ状に下方に突出している（図２参照）。内部絶縁封止材７は、貫通孔が形成された板材である。 The outer insulating sealing material 6 and the inner insulating sealing material 7 are made of a synthetic resin having insulating properties and sealing properties. The external insulating sealing material 6 is formed of an octagonal column body that is slightly larger than the pedestal portion 8a of the auxiliary terminal 8, and an auxiliary terminal recess 6b having a shape in which the pedestal portion 8a is fitted is provided on the upper surface. The external insulating sealing material 6 has a through hole formed in the bottom surface of the auxiliary terminal recess 6b, and the lower surface opening of the through hole protrudes downward in a sleeve shape (see FIG. 2). The internal insulating sealing material 7 is a plate material in which through holes are formed.

上記外部絶縁封止材６は、蓋板３の上面に配置され、スリーブ状に突出した部分が端子引出貫通孔３ａに嵌入される。また、内部絶縁封止材７は、蓋板３の下面に配置され、端子引出貫通孔３ａから下方に突出する外部絶縁封止材６のスリーブ状に突出した部分が貫通孔に嵌入される。そして、補助端子８は、台座部８ａを外部絶縁封止材６の補助端子凹部６ｂに嵌め込むと共に、第１かしめ筒８ｂをこの補助端子凹部６ｂの底面の貫通孔と蓋板３の端子引出貫通孔３ａと内部絶縁封止材７の貫通孔とを介して、集電接続体５の接続部５ａの貫通孔に通し、この接続部５ａの貫通孔から下方に突出する部分を下方からかしめることにより蓋板３に取り付けられる。従って、この補助端子８は、第１かしめ筒８ｂと集電接続体５の接続部５ａとのかしめによる接続部を介して発電要素２の金属箔２ａに接続されると共に、絶縁封止材６、７を介して蓋板３を挟持するので、この蓋板３に対して絶縁封止された状態で固着されることになる。 The external insulating sealing material 6 is disposed on the upper surface of the cover plate 3, and a portion protruding in a sleeve shape is fitted into the terminal lead-through hole 3a. Further, the inner insulating sealing material 7 is disposed on the lower surface of the cover plate 3, and a portion of the outer insulating sealing material 6 protruding downward from the terminal lead-through hole 3a is fitted into the through hole. The auxiliary terminal 8 fits the pedestal portion 8 a into the auxiliary terminal recess 6 b of the external insulating sealing material 6, and the first caulking tube 8 b extends from the through hole in the bottom surface of the auxiliary terminal recess 6 b and the terminal lead of the cover plate 3. Through the through-hole 3a and the through-hole of the internal insulating sealing material 7, it passes through the through-hole of the connecting portion 5a of the current collector connector 5, and the portion protruding downward from the through-hole of this connecting portion 5a is viewed from below. It is attached to the cover plate 3 by crimping. Therefore, the auxiliary terminal 8 is connected to the metal foil 2a of the power generating element 2 through a connection portion by caulking between the first caulking tube 8b and the connection portion 5a of the current collector connection body 5, and the insulating sealing material 6 , 7, the cover plate 3 is clamped, so that the cover plate 3 is fixed to the cover plate 3 while being insulated and sealed.

上記蓋板３には、上面における端子引出貫通孔３ａ、３ａの左右の外側にそれぞれ回り止め部材１０、１０（左側の回り止め部材１０は部品の陰になって見えない）が固着されている。回り止め部材１０は、ポリフェニレンサルファイド（ＰＰＳ）等の合成樹脂製の高さの低い四角柱状のブロックであり、蓋板３の上面におけるこの回り止め部材１０の固着位置の金属面が微細な凹凸面となるように加工した後に、この上方を囲むように金型を配置して溶融した樹脂を流し込み固化させて成形したものである。なお、この回り止め部材１０は、ブロック状に成形したものを接着剤や熱溶着により蓋板３の上面に固着させてもよいが、蓋板３の表面を処理して直接射出成形したものの方がより強固に固着させることができる。 Anti-rotation members 10 and 10 (the left anti-rotation member 10 cannot be seen behind the parts) are fixed to the lid plate 3 on the left and right outer sides of the terminal lead-through holes 3a and 3a on the upper surface, respectively. . The anti-rotation member 10 is a rectangular column-shaped block made of a synthetic resin such as polyphenylene sulfide (PPS), and the metal surface at the fixing position of the anti-rotation member 10 on the upper surface of the cover plate 3 has a fine uneven surface. Then, the mold is arranged so as to surround the upper part, and the molten resin is poured and solidified. The anti-rotation member 10 may be formed into a block shape, and may be fixed to the upper surface of the lid plate 3 by an adhesive or heat welding. However, the non-rotating member 10 may be directly injection molded by treating the surface of the lid plate 3. Can be firmly fixed.

上記回り止め部材１０の上には外部端子４が配置される。外部端子４は、非水電解質二次電池を外部機器と接続するためのものであり、鉄やステンレス鋼、クロムモリブデン鋼等の鋼、その他の強度の高い導電金属材からなる。この外部端子４は、高さの低い四角柱ではあるが、回り止め部材１０よりは一回り大きい台座部４ａの上面からボルト部４ｂを上方に突設したものである。また、この台座部４ａの下面には上方に向けて、回り止め部材１０が嵌合する形状の回り止め凹部４ｄが設けられている。そして、外部端子４は、台座部４ａの回り止め凹部４ｄを回り止め部材１０に被せるようにして、この回り止め部材１０の上に載置される。ただし、外部端子４の台座部４ａの回り止め凹部４ｄの深さは、回り止め部材１０の高さより少し浅いので、この台座部４ａの下面は、蓋板３の上面よりも上方に浮いた状態となる。 An external terminal 4 is disposed on the anti-rotation member 10. The external terminal 4 is for connecting the nonaqueous electrolyte secondary battery to an external device, and is made of steel such as iron, stainless steel, chrome molybdenum steel, or other highly conductive metal material. Although the external terminal 4 is a rectangular column having a low height, a bolt portion 4b is projected upward from the upper surface of the pedestal portion 4a that is slightly larger than the rotation preventing member 10. Further, an anti-rotation recess 4d having a shape into which the anti-rotation member 10 is fitted is provided on the lower surface of the pedestal 4a. Then, the external terminal 4 is placed on the anti-rotation member 10 so that the anti-rotation recess 4d of the pedestal portion 4a covers the anti-rotation member 10. However, the depth of the anti-rotation recess 4 d of the pedestal portion 4 a of the external terminal 4 is slightly shallower than the height of the anti-rotation member 10, so that the lower surface of the pedestal portion 4 a floats above the upper surface of the lid plate 3. It becomes.

上記補助端子８の第２かしめ筒８ｃと外部端子４のボルト部４ｂには、接続導体９が取り付けられる。接続導体９は、銅合金等の導電金属材からなるほぼ長方形状の板材であり、表面には防錆等の他、滑りを良くするためにニッケルメッキが施されている。この接続導体９は、一端部にかしめ孔９ａが形成されると共に、他端部に端子貫通孔９ｂが形成されている。そして、この接続導体９は、端子貫通孔９ｂに外部端子４のボルト部４ｂが下方から挿入されると共に、かしめ孔９ａに補助端子８の第２かしめ筒８ｃが下方から挿入されて上方からかしめられる。従って、接続導体９は、補助端子８には接続固定されるが、外部端子４はボルト部４ｂが端子貫通孔９ｂに嵌入しているだけとなる。なお、平板状の接続導体９を補助端子８にかしめによって確実に固定するためには、補助端子８の台座部８ａの上面と回り止め部材１０の上に載置した外部端子４の台座部４ａの上面は、面一か外部端子４の台座部４ａの上面の方が僅かに低いことが好ましい。もっとも、外部端子４が持ち上がり台座部４ａの上面が接続導体９の下面に当接した際に、回り止め凹部４ｄと回り止め部材１０との嵌合が外れるようでは、この回り止め部材１０が外部端子４の回り止めを行うことができないので、台座部４ａの上面は低すぎてはいけない。 A connection conductor 9 is attached to the second caulking cylinder 8 c of the auxiliary terminal 8 and the bolt part 4 b of the external terminal 4. The connection conductor 9 is a substantially rectangular plate material made of a conductive metal material such as a copper alloy, and the surface thereof is nickel-plated to improve sliding in addition to rust prevention. The connecting conductor 9 has a caulking hole 9a at one end and a terminal through hole 9b at the other end. The connecting conductor 9 has a bolt portion 4b of the external terminal 4 inserted into the terminal through hole 9b from below, and a second caulking tube 8c of the auxiliary terminal 8 inserted into the caulking hole 9a from below so as to be caulked from above. It is done. Accordingly, the connection conductor 9 is connected and fixed to the auxiliary terminal 8, but the external terminal 4 has only the bolt portion 4 b fitted into the terminal through hole 9 b. In order to securely fix the flat connection conductor 9 to the auxiliary terminal 8 by caulking, the pedestal 4a of the external terminal 4 placed on the upper surface of the pedestal 8a of the auxiliary terminal 8 and the anti-rotation member 10 is used. It is preferable that the upper surface of the base plate 4 is flush or slightly lower than the upper surface of the base portion 4a of the external terminal 4. However, when the external terminal 4 is lifted and the upper surface of the pedestal portion 4a is in contact with the lower surface of the connection conductor 9, the anti-rotation member 10 is externally attached so that the anti-rotation recess 4d and the anti-rotation member 10 are disengaged. Since the rotation prevention of the terminal 4 cannot be performed, the upper surface of the base part 4a must not be too low.

上記構成の非水電解質二次電池の外部端子４は、例えば図示しない外部機器のリード線の圧着端子をボルト部４ｂに嵌めてナットを螺着する。すると、外部端子４は、通常は僅かに持ち上がって、台座部４ａの上面を接続導体９の下面に押し付け、ナットとの間でリード線の圧着端子と共にこの接続導体９を挟持圧迫するので、これら圧着端子と外部端子４と接続導体９とが接続される。従って、リード線の圧着端子は、接続導体９と補助端子８と集電接続体５とを介して発電要素２の電極（金属箔２ａ）に接続され、これによって外部機器が非水電解質二次電池と接続される。 For example, the external terminal 4 of the non-aqueous electrolyte secondary battery having the above-described configuration is formed by fitting a crimp terminal of a lead wire of an external device (not shown) into the bolt portion 4b and screwing a nut. Then, the external terminal 4 is usually lifted slightly and presses the upper surface of the pedestal portion 4a against the lower surface of the connection conductor 9 and presses the connection conductor 9 with the crimp terminal of the lead wire between the nut and the nut. The crimp terminal, the external terminal 4 and the connection conductor 9 are connected. Therefore, the crimp terminal of the lead wire is connected to the electrode (metal foil 2a) of the power generation element 2 through the connection conductor 9, the auxiliary terminal 8, and the current collector connection body 5, whereby the external device is connected to the nonaqueous electrolyte secondary. Connected with battery.

しかも、ナットをボルト部４ｂに締め付ける際に回転しようとする外部端子４は、回り止め凹部４ｄに嵌合した回り止め部材１０によって確実に回り止めされる。なお、この際、回り止め部材１０と回り止め凹部４ｄとの嵌合による多少の隙間によって外部端子４がある程度の角度だけ空転したとしても、接続や封止に支障が生じるおそれは全くない。 In addition, the external terminal 4 that is to rotate when the nut is fastened to the bolt portion 4b is reliably prevented from rotating by the rotation preventing member 10 fitted in the rotation preventing recess 4d. At this time, even if the external terminal 4 is idled by a certain angle due to a slight gap due to the fitting between the rotation prevention member 10 and the rotation prevention recess 4d, there is no possibility of causing trouble in connection or sealing.

また、このときボルト部４ｂに加わった締め付けトルクは、外部端子４とは分離された補助端子８にトルクとして伝わることはないので、この補助端子８が空転して集電接続体５の接続部５ａとのかしめが緩み接続が損なわれたり、絶縁封止材６、７と蓋板３との間の封止が損なわれるようなおそれも生じない。なお、ナットによる締め付けトルクは、ボルト部４ｂの軸線を中心として接続導体９を回転させるような力も生じるが、このような力は補助端子８にとっては第２かしめ筒８ｃを前後方向に押す方向の力となるので、これによって接続や封止が損なわれる心配はない。特に、本実施形態では、接続導体９の表面に滑りを良くするためのニッケルメッキが施されているので、ナットによる締め付けが行われても、接続導体９を回転させるような力がほとんど生じない。 Further, at this time, the tightening torque applied to the bolt portion 4 b is not transmitted as torque to the auxiliary terminal 8 separated from the external terminal 4, so that the auxiliary terminal 8 idles and the connecting portion of the current collector connector 5 is connected. There is no possibility that the caulking with 5a is loosened and the connection is lost, or the sealing between the insulating sealing materials 6 and 7 and the cover plate 3 is damaged. The tightening torque by the nut also causes a force that rotates the connection conductor 9 about the axis of the bolt portion 4b. However, such a force is in the direction of pushing the second caulking cylinder 8c in the front-rear direction for the auxiliary terminal 8. There is no worry that this will damage the connection and sealing. In particular, in this embodiment, since the surface of the connection conductor 9 is nickel-plated to improve slippage, even if tightening with a nut is performed, a force that rotates the connection conductor 9 hardly occurs. .

さらに、回り止め部材１０は、ナットによる締め付けの際に、外部端子４の回り止めを行うので、大きな締め付けトルクを受けることになる。しかし、この回り止め部材１０は、蓋板３上で外部絶縁封止材６とは分離されているので、補助端子８の封止を行う外部絶縁封止材６に締め付けトルクが加わることはなく、このため外部絶縁封止材６による封止が損なわれるおそれも生じない。 Further, since the anti-rotation member 10 prevents the external terminal 4 from rotating when tightening with a nut, it receives a large tightening torque. However, since the anti-rotation member 10 is separated from the external insulating sealing material 6 on the cover plate 3, no tightening torque is applied to the external insulating sealing material 6 that seals the auxiliary terminal 8. For this reason, there is no possibility that the sealing by the external insulating sealing material 6 is impaired.

さらに、ナットによる締め付けトルクは、鉄や鋼等の強度の高い導電金属材からなる外部端子４にのみ加わり、強度が弱いアルミニウム又はアルミニウム合金からなる正極側の補助端子８や強度が比較的弱い銅又は銅合金からなる負極側の補助端子８には加わらないので、ナットを強く締め付けたり、このようなナットの着脱を繰り返しても、ボルト部４ｂのねじ山が破損するようなおそれがなくなる。 Further, the tightening torque by the nut is applied only to the external terminal 4 made of a conductive metal material having high strength such as iron or steel, and the auxiliary terminal 8 on the positive electrode side made of weak aluminum or aluminum alloy or copper having relatively weak strength. Or, since it is not applied to the auxiliary terminal 8 on the negative electrode side made of a copper alloy, there is no possibility that the screw thread of the bolt portion 4b is damaged even if the nut is strongly tightened or the nut is repeatedly attached and detached.

なお、上記実施形態では、四角柱状の回り止め部材１０を台座部４ａの回り止め凹部４ｄに嵌合させることにより外部端子４の回り止めを行う場合を示したが、台座部４ａを回り止め部材１０に係止することによりボルト部４ｂの軸線を中心とした外部端子４の回転を制限することができるものであれば、これら台座部４ａと回り止め部材１０の形状は任意である。 In the above-described embodiment, the case where the external terminal 4 is prevented from rotating by fitting the square pillar-shaped detent member 10 into the detent recess 4d of the pedestal portion 4a has been described. However, the pedestal portion 4a is prevented from rotating. As long as the rotation of the external terminal 4 around the axis of the bolt portion 4b can be restricted by engaging with the bolt portion 4b, the shape of the pedestal portion 4a and the rotation preventing member 10 is arbitrary.

例えば、図３には、外部端子４の台座部４ａを四角柱状とし、回り止め部材１０をこの台座部４ａよりも一回り大きい四角柱状とすると共に、上面にこの台座部４ａが嵌合する形状の回り止め凹部１０ａを形成した場合を示す。この場合も、台座部４ａが回り止め部材１０の回り止め凹部１０ａに嵌まり込むことにより、外部端子４の回り止めを行うことができる。図１や図３に示すように回り止め部材１０と台座部４ａが柱体を凹部に嵌合させて回り止めを行う場合には、この柱体や凹部の横断面形状がボルト部４ｂの軸線を中心とした回転体ではない形状であれば、どのような形状であってもよく、四角柱状以外の任意の多角柱状を用いてもよい。 For example, in FIG. 3, the pedestal portion 4a of the external terminal 4 has a quadrangular prism shape, and the anti-rotation member 10 has a quadrangular prism shape that is slightly larger than the pedestal portion 4a, and the pedestal portion 4a is fitted on the upper surface. The case where the anti-rotation recessed part 10a of this is formed is shown. Also in this case, when the pedestal portion 4a is fitted into the rotation stopper recess 10a of the rotation prevention member 10, the rotation of the external terminal 4 can be prevented. As shown in FIGS. 1 and 3, when the anti-rotation member 10 and the pedestal portion 4a prevent the rotation by fitting the column into the recess, the cross-sectional shape of the column or recess is the axis of the bolt 4b. As long as it is a shape that is not a rotating body centering on, any shape may be used, and any polygonal column shape other than a square columnar shape may be used.

また、例えば図４には、図３に示した回り止め部材１０の回り止め凹部１０ａが四角形に窪んだ凹部ではなく、溝状の凹部である場合を示す。この場合も、台座部４ａがこの溝状の回り止め凹部１０ａに嵌まり込んで溝の縁部によって回転を制限されることにより、外部端子４の回り止めを行うことができる。さらに、例えば図５には、台座部４ａの下面と回り止め部材１０の上面に畝状の凹凸を形成することにより、これらの凹凸が互いに噛み合って外部端子４の回り止めを行う場合を示す。 Further, for example, FIG. 4 shows a case where the rotation stopper 10a of the rotation stopper 10 shown in FIG. 3 is not a recess recessed in a square shape but a groove-like recess. Also in this case, the pedestal portion 4a is fitted into the groove-shaped detent recess 10a and the rotation of the pedestal portion 4a is restricted by the edge of the groove, whereby the external terminal 4 can be detented. Further, for example, FIG. 5 shows a case where hook-shaped irregularities are formed on the lower surface of the pedestal portion 4 a and the upper surface of the anti-rotation member 10, and these irregularities mesh with each other to prevent the external terminal 4 from rotating.

また、上記実施形態では、合成樹脂製の回り止め部材１０を用いる場合を示したが、絶縁性を有しある程度以上の強度を有するものであれば、例えばセラミックス等の任意の材料を用いることができる。さらに、蓋板３が外部端子４と導通してもよい場合や蓋板３が絶縁性の材料からなる場合等のように、外部端子４の絶縁を考慮しなくてもよい事情がある場合には、絶縁性がなくても、ある程度以上の強度を有するものであれば、例えば金属等の任意の材料を用いることができる。さらに、この回り止め部材１０の蓋板３上への固着も、回り止め部材１０の材料に応じた、例えば金属材料同士であれば溶接等の任意の手段を用いることができる。さらに、この回り止め部材１０は、蓋板３上に固着されたものに限らず、この蓋板３上にこの蓋板３と一体化して配置されたものであればよく、例えばこの蓋板３の一部を加工したものであってもよい。 Moreover, in the said embodiment, although the case where the synthetic resin rotation prevention member 10 was used was shown, as long as it has insulation and the intensity | strength more than a certain level, it is possible to use arbitrary materials, such as ceramics, for example. it can. Furthermore, when there is a situation where it is not necessary to consider the insulation of the external terminal 4 such as when the cover plate 3 may be electrically connected to the external terminal 4 or when the cover plate 3 is made of an insulating material. Any material such as metal can be used as long as it has a certain level of strength even if it is not insulating. Furthermore, for the fixing of the anti-rotation member 10 onto the cover plate 3, any means such as welding can be used according to the material of the anti-rotation member 10 as long as it is, for example, metal materials. Further, the anti-rotation member 10 is not limited to the member fixed on the cover plate 3, and may be any member as long as it is integrated with the cover plate 3 on the cover plate 3. A part of this may be processed.

また、上記実施形態では、集電接続体５と補助端子８が正極側ではアルミニウム又はアルミニウム合金からなり負極側では銅又は銅合金からなる場合を示したが、電池の種類に応じた導電金属材料であれば、これらの材料は任意である。さらに、上記実施形態では、外部端子４と接続導体９の材料についても例示したが、強度や導電性等の特性が適合する導電金属材料であれば、これらの材料も任意である。 In the above embodiment, the case where the current collector connector 5 and the auxiliary terminal 8 are made of aluminum or an aluminum alloy on the positive electrode side and copper or copper alloy on the negative electrode side is shown, but the conductive metal material according to the type of the battery If so, these materials are optional. Furthermore, in the said embodiment, although illustrated about the material of the external terminal 4 and the connection conductor 9, as long as it is a conductive metal material with which characteristics, such as intensity | strength and electroconductivity, are compatible, these materials are also arbitrary.

また、上記実施形態では、外部端子４の台座部４ａの上面からボルト部４ｂが突設される場合を示したが、このボルト部４ｂの代わりに、円筒形や多角形の筒状等の適宜形状の突出部が突設され、この突出部の上端面にねじ穴が穿設されているような場合であっても、同様に実施可能である。 Moreover, in the said embodiment, although the case where the bolt part 4b protruded from the upper surface of the base part 4a of the external terminal 4 was shown, instead of this bolt part 4b, cylindrical shape, polygonal cylindrical shape, etc. suitably Even in the case where a protruding portion having a shape protrudes and a screw hole is formed in the upper end surface of the protruding portion, the embodiment can be similarly implemented.

また、上記実施形態では、補助端子８の第２かしめ筒８ｃを接続導体９のかしめ孔９ａに通してかしめることにより接続固定する場合を示したが、補助端子８と接続導体９の接続固定手段は任意であり、例えば補助端子８の台座部８ａの上面に接続導体９の一端部を溶接等により固着して接続固定することもできる。 In the above embodiment, the case where the second caulking cylinder 8c of the auxiliary terminal 8 is connected and fixed by caulking through the caulking hole 9a of the connecting conductor 9 is shown. However, the auxiliary terminal 8 and the connecting conductor 9 are fixedly connected. The means is arbitrary. For example, one end of the connection conductor 9 can be fixed to the upper surface of the base portion 8a of the auxiliary terminal 8 by welding or the like.

また、接続導体９の他端部に形成されるのは、下方から外部端子４のボルト部を貫通させて接続するようにした端子貫通孔９ｂに限らず、このボルト部４ｂが接続されるようになった端子接続部であればどのようなものでもよく、例えば切欠き溝のようなものであってもよい。さらに、この接続導体９は、他端部に端子接続部が形成されていれば、必ずしも板状である必要はない。さらに、接続導体９が補助端子８に接続固定されるのは一端部に限らず、接続導体９の一部であればどの部位でもよく、端子接続部も、この補助端子８に接続固定される部位以外の他の部位であればどこに形成されていてもよい。 Moreover, what is formed in the other end part of the connection conductor 9 is not limited to the terminal through hole 9b that is connected through the bolt part of the external terminal 4 from below, so that this bolt part 4b is connected. Any terminal connection part can be used, for example, a notch groove. Further, the connection conductor 9 does not necessarily have a plate shape as long as the terminal connection portion is formed at the other end. Further, the connection conductor 9 is connected and fixed to the auxiliary terminal 8 not only at one end portion, but may be any part as long as it is a part of the connection conductor 9, and the terminal connection portion is also connected and fixed to the auxiliary terminal 8. Any part other than the part may be formed.

また、上記実施形態では、接続導体９を用いる場合を示したが、この接続導体９に代えて、補助端子８の上部から引き出され、この引き出された部分に端子接続部が形成された接続導体部を用いるようにしてもよい。この場合、接続導体部は、補助端子８と一体のものであるため、接続導体９が不要となり部品点数を削減できると共に、この接続導体９とのかしめ作業が不要となるので、組み立て作業工数も削減できる。 Moreover, although the case where the connection conductor 9 was used was shown in the said embodiment, it replaced with this connection conductor 9, and was pulled out from the upper part of the auxiliary terminal 8, and the connection conductor by which the terminal connection part was formed in this extracted part May be used. In this case, since the connecting conductor portion is integrated with the auxiliary terminal 8, the connecting conductor 9 is not necessary, and the number of parts can be reduced, and the caulking work with the connecting conductor 9 is not required. Can be reduced.

また、上記実施形態では、補助端子８と発電要素２の電極との間の接続を集電接続体５を介して行う場合を示したが、この補助端子８と電極との間の接続構造は任意であり、上記実施形態とは異なる集電接続体を用いてもよいし、他の手段によって接続を行うようにしてもよい。さらに、発電要素２も、長円筒形の巻回型のものには限定されず、他の形状のものでもよく、積層型のものであってもよい。 Moreover, in the said embodiment, although the case where the connection between the auxiliary terminal 8 and the electrode of the electric power generation element 2 was performed via the current collection connection body 5 was shown, the connection structure between this auxiliary terminal 8 and an electrode is shown. It is optional, and a current collector connector different from the above embodiment may be used, or connection may be made by other means. Furthermore, the power generation element 2 is not limited to a long cylindrical winding type, and may be of other shapes or a laminated type.

また、上記実施形態では、補助端子８の台座部８ａや外部絶縁封止材６が八角柱状である場合を示したが、これら台座部８ａや外部絶縁封止材６の形状は任意であり、外部絶縁封止材６にも、必ずしも補助端子凹部６ｂを設ける必要はない。さらに、上記実施形態では、補助端子８が台座部８ａの下面から第１かしめ筒８ｂを突設したものである場合を示したが、上部が蓋板３上に配置され、下部が端子引出貫通孔３ａを通して電池容器１内部に嵌入していれば、必ずしも台座部８ａや第１かしめ筒８ｂを有する必要はなく、特に第１かしめ筒８ｂは、上記補助端子８と電極との間の接続構造に応じて任意の構成のものに変更することができる。 Moreover, in the said embodiment, although the case where the base part 8a of the auxiliary terminal 8 and the external insulation sealing material 6 were octagonal column shape was shown, the shape of these base parts 8a and the external insulation sealing material 6 is arbitrary, The external insulating sealing material 6 is not necessarily provided with the auxiliary terminal recess 6b. Furthermore, although the case where the auxiliary terminal 8 has the first caulking tube 8b protruding from the lower surface of the pedestal portion 8a is shown in the above embodiment, the upper portion is disposed on the cover plate 3, and the lower portion is the terminal lead-through. If it is inserted into the battery case 1 through the hole 3a, it is not always necessary to have the pedestal portion 8a and the first caulking cylinder 8b. In particular, the first caulking cylinder 8b has a connection structure between the auxiliary terminal 8 and the electrode. It can be changed to an arbitrary configuration according to the above.

また、上記実施形態では、封止材として外部絶縁封止材６と内部絶縁封止材７を用いる場合を示したが、補助端子８と蓋板３との間の封止するものであれば任意の封止材を用いることができる。例えば、補助端子８には締め付けトルクが加わらないので、ハーメチックシールによって蓋板３に封止固着してもよいし、シート状や接着剤状の封止材を用いることもできる。 Moreover, in the said embodiment, although the case where the external insulation sealing material 6 and the internal insulation sealing material 7 were used as a sealing material was shown, if it seals between the auxiliary terminal 8 and the cover board 3, it will be shown. Any sealing material can be used. For example, since the tightening torque is not applied to the auxiliary terminal 8, it may be sealed and fixed to the cover plate 3 by a hermetic seal, or a sheet-like or adhesive-like sealing material may be used.

また、上記実施形態では、電池容器１や蓋板３がアルミニウム合金や鋼等からなる場合を示したが、これら電池容器１や蓋板３の材質は任意であり、金属以外の例えば絶縁性の材質のものを用いることもできる。さらに、これら電池容器１と蓋板３の形状や構造も、上記実施形態に限定されず任意である。 Moreover, in the said embodiment, although the case where the battery container 1 and the cover plate 3 consist of aluminum alloys, steel, etc. was shown, the material of these battery containers 1 and the cover plate 3 is arbitrary, for example, insulating other than a metal The thing of a material can also be used. Furthermore, the shapes and structures of the battery container 1 and the cover plate 3 are not limited to the above embodiment and are arbitrary.

また、上記実施形態では、大型の非水電解質二次電池について説明したが、電池の種類や大きさ（容量）も任意である。本発明は、これらの電池の中で、高い気密性が求められる密閉形電池に特に好適に適用できる。 Moreover, in the said embodiment, although the large sized non-aqueous electrolyte secondary battery was demonstrated, the kind and magnitude | size (capacity) of a battery are also arbitrary. Among these batteries, the present invention can be particularly suitably applied to sealed batteries that require high airtightness.

本発明の一実施形態を示すものであって、非水電解質二次電池の構造を示す分解斜視図である。1 is an exploded perspective view showing a structure of a nonaqueous electrolyte secondary battery according to an embodiment of the present invention. 本発明の一実施形態を示すものであって、非水電解質二次電池の外部端子の取り付け構造を示す部分拡大縦断面正面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged longitudinal sectional front view showing an embodiment of the present invention and showing an external terminal mounting structure of a nonaqueous electrolyte secondary battery. 本発明の他の実施形態を示すものであって、回り止め部材に回り止め凹部を設けた場合の一部省略分解斜視図である。FIG. 10 is a partially omitted exploded perspective view showing another embodiment of the present invention, in which a rotation preventing recess is provided in the rotation preventing member. 本発明の他の実施形態を示すものであって、回り止め部材の回り止め凹部を溝状とした場合の一部省略分解斜視図である。FIG. 9 is a partially omitted exploded perspective view showing another embodiment of the present invention, in which the rotation preventing recess of the rotation preventing member is formed in a groove shape. 本発明の他の実施形態を示すものであって、外部端子の台座部と回り止め部材に畝状の凹凸を形成した一部省略分解斜視図である。FIG. 10 is a partially omitted exploded perspective view showing another embodiment of the present invention, in which hook-shaped irregularities are formed on the base portion of the external terminal and the anti-rotation member. 従来例を示すものであって、非水電解質二次電池の構造を示す分解斜視図である。It is a disassembled perspective view which shows a prior art example and shows the structure of a nonaqueous electrolyte secondary battery. 他の従来例を示すものであって、非水電解質二次電池の構造を示す分解斜視図である。It is a disassembled perspective view which shows another prior art example, and shows the structure of a nonaqueous electrolyte secondary battery.

１電池容器
２発電要素
２ａ金属箔
３蓋板
３ａ端子引出貫通孔
４外部端子
４ａ台座部
４ｂボルト部
４ｃかしめ筒
４ｄ回り止め凹部
５集電接続体
５ａ接続部
６外部絶縁封止材
６ａ外部端子凹部
６ｂ補助端子凹部
７内部絶縁封止材
８補助端子
８ａ台座部
８ｂ第１かしめ筒
８ｃ第２かしめ筒
９接続導体
９ａかしめ孔
９ｂ端子貫通孔
１０回り止め部材
１０ａ回り止め凹部
DESCRIPTION OF SYMBOLS 1 Battery container 2 Power generation element 2a Metal foil 3 Cover plate 3a Terminal extraction through-hole 4 External terminal 4a Base part 4b Bolt part 4c Caulking cylinder 4d Anti-rotation recessed part 5 Current collection connector 5a Connection part 6 External insulation sealing material 6a External terminal Concave part 6b Auxiliary terminal concave part 7 Internal insulating sealing material 8 Auxiliary terminal 8a Pedestal part 8b First caulking cylinder 8c Second caulking cylinder 9 Connection conductor 9a Caulking hole 9b Terminal through hole 10 Anti-rotation member 10a Anti-rotation concave part

Claims

発電要素と、
前記発電要素を収納した電池容器と、
前記電池容器の上端開口部を塞ぐ蓋板と、
前記蓋板の端子引出貫通孔を通して下部が前記電池容器内部に貫入し前記発電要素の電極に接続されると共に、前記蓋板に封止材を介して封止固着された補助端子と、
前記補助端子の上部に一部が接続固定されると共に、他の部位に端子接続部が形成された接続導体と、
台座部と前記台座部の上方に突出するボルト部とを備え、前記接続導体の前記端子接続部に前記ボルト部を接続させた外部端子と、
前記蓋板上で前記外部端子の前記台座部を係止する回り止め部材と、
前記ボルト部に螺着されたナットと、
を備え、
前記補助端子は、正極端子側の補助端子と、負極端子側の補助端子と、を有し、
前記正極端子側の補助端子は、アルミニウム又はアルミニウム合金からなり、
前記負極端子側の補助端子は、銅又は銅合金からなり、
前記外部端子は、鉄又は鋼からなり、
前記回り止め部材は、前記蓋板の上面に固着されていると共に、前記封止材と分離されていることを特徴とする電池。 Power generation elements,
A battery container containing the power generation element;
A lid plate for closing the upper end opening of the battery container;
The lower part penetrates into the inside of the battery container through the terminal lead-through hole of the lid plate and is connected to the electrode of the power generation element, and the auxiliary terminal sealed and fixed to the lid plate via a sealing material,
A connection conductor in which a part is fixedly connected to the upper part of the auxiliary terminal and a terminal connection part is formed in another part,
An external terminal comprising a pedestal part and a bolt part protruding above the pedestal part, and connecting the bolt part to the terminal connection part of the connection conductor;
A detent member for locking the pedestal portion of the external terminal on the lid plate;
A nut screwed to the bolt part;
With
The auxiliary terminal has a positive terminal side auxiliary terminal and a negative terminal side auxiliary terminal,
The auxiliary terminal on the positive electrode terminal side is made of aluminum or an aluminum alloy,
The auxiliary terminal on the negative electrode terminal side is made of copper or a copper alloy,
The external terminal is made of iron or steel,
It said detent member is Rutotomoni is fixed to an upper surface of the cover plate, battery, characterized in that you have been separated from the sealing material.

前記回り止め部材は、接着剤、熱溶着、又は溶接により前記蓋板の上面に固着されている
請求項１に記載の電池。 The battery according to claim 1, wherein the rotation preventing member is fixed to the upper surface of the lid plate by an adhesive, heat welding, or welding.

発電要素と、
前記発電要素を収納した電池容器と、
前記電池容器の上端開口部を塞ぐ蓋板と、
前記蓋板の端子引出貫通孔を通して下部が前記電池容器内部に貫入し前記発電要素の電極に接続されると共に、前記蓋板に封止材を介して封止固着された補助端子と、
前記補助端子の上部に一部が接続固定されると共に、他の部位に端子接続部が形成された接続導体と、
台座部と前記台座部の上方に突出するボルト部とを備え、前記接続導体の前記端子接続部に前記ボルト部を接続させた外部端子と、前記蓋板上で前記外部端子の前記台座部を係止すると共に、前記封止材と分離された回り止め部材と、
前記ボルト部に螺着されたナットと、
を備え、
前記補助端子は、正極端子側の補助端子と、負極端子側の補助端子と、を有し、
前記正極端子側の補助端子は、アルミニウム又はアルミニウム合金からなり、
前記負極端子側の補助端子は、銅又は銅合金からなり、
前記外部端子は、鉄又は鋼からなる、
電池の製造方法であって、
前記蓋板の上方を囲むように金型を配置した状態で溶融した樹脂を流し込み、当該樹脂を固化させることによって前記回り止め部材を成形する工程を有する
電池の製造方法。

Power generation elements,
A battery container containing the power generation element;
A lid plate for closing the upper end opening of the battery container;
The lower part penetrates into the inside of the battery container through the terminal lead-through hole of the lid plate and is connected to the electrode of the power generation element, and the auxiliary terminal sealed and fixed to the lid plate via a sealing material,
A connection conductor in which a part is fixedly connected to the upper part of the auxiliary terminal and a terminal connection part is formed in another part,
An external terminal having a pedestal part and a bolt part protruding above the pedestal part, wherein the bolt part is connected to the terminal connection part of the connection conductor; and the pedestal part of the external terminal on the lid plate. engaging abolish Rutotomoni, a stop member Ri said sealing material and separated times,
A nut screwed to the bolt part;
With
The auxiliary terminal has a positive terminal side auxiliary terminal and a negative terminal side auxiliary terminal,
The auxiliary terminal on the positive electrode terminal side is made of aluminum or an aluminum alloy,
The auxiliary terminal on the negative electrode terminal side is made of copper or a copper alloy,
The external terminal is made of iron or steel.
A battery manufacturing method comprising:
A method for producing a battery, comprising: pouring molten resin in a state in which a mold is disposed so as to surround an upper portion of the lid plate, and molding the rotation-preventing member by solidifying the resin.