JP5957859B2 - Electricity storage element - Google Patents

Electricity storage element Download PDF

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JP5957859B2
JP5957859B2 JP2011261067A JP2011261067A JP5957859B2 JP 5957859 B2 JP5957859 B2 JP 5957859B2 JP 2011261067 A JP2011261067 A JP 2011261067A JP 2011261067 A JP2011261067 A JP 2011261067A JP 5957859 B2 JP5957859 B2 JP 5957859B2
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current collector
electrode
electrode body
insulating sheet
storage element
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JP2013114940A (en
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増田 英樹
英樹 増田
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GS Yuasa International Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13Energy storage using capacitors
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Description

本発明は、例えば二次電池その他の電池等の蓄電素子に関する。   The present invention relates to power storage elements such as secondary batteries and other batteries.

二次電池は、一次電池の置きかえ用途はもとより、携帯電話、IT機器などの電子機器の電源として広く普及している。とりわけ、リチウムイオン電池に代表される非水電解質二次電池は、高エネルギー密度であることから、電気自動車などの産業用大型電気機器への応用も進められている。   Secondary batteries are widely used as power sources for electronic devices such as mobile phones and IT devices, as well as for replacing primary batteries. In particular, since non-aqueous electrolyte secondary batteries represented by lithium ion batteries have high energy density, they are also being applied to industrial large electric devices such as electric vehicles.

図13は、従来の技術による、非水電解質二次電池の模式的な構成を示す分解斜視図である(例えば特許文献1を参照)。   FIG. 13 is an exploded perspective view showing a schematic configuration of a nonaqueous electrolyte secondary battery according to a conventional technique (see, for example, Patent Document 1).

図13に示すように、非水電解質二次電池100は、開口110xを有する開口箱状の容器本体110と、アルミニウム製の板状の蓋部120とから構成される、外形六面体の電池容器を外装として備える。   As shown in FIG. 13, the nonaqueous electrolyte secondary battery 100 is a hexahedral battery container composed of an open box-shaped container body 110 having an opening 110 x and an aluminum plate-shaped lid 120. Provide as an exterior.

電極体111は、帯状の電極である正極と負極を、セパレータを介して長円筒形に巻回してなる電極体本体111bと、電極体本体111aの更に外周に巻回された絶縁シート111cとを備える。   The electrode body 111 includes an electrode body main body 111b formed by winding a positive electrode and a negative electrode, which are band-shaped electrodes, into a long cylindrical shape via a separator, and an insulating sheet 111c wound around the outer periphery of the electrode body main body 111a. Prepare.

電極体本体111bは、巻回された状態において、正極及び負極は巻回軸の両端の異なる方向に位置ずれし、電極体111の両端にそれぞれ位置する。更に、各電極の端部は活物質が担持されておらず、基材である金属箔が露出している。電極体本体111の両端部にそれぞれはみ出した金属箔としての正極111a、負極111a´には、導電性の金属板である、正極側の集電体112及び負極側の集電体112´がそれぞれ接続される。   When the electrode body 111b is wound, the positive electrode and the negative electrode are displaced in different directions at both ends of the winding shaft, and are positioned at both ends of the electrode body 111, respectively. Furthermore, the active material is not supported at the end of each electrode, and the metal foil as the base material is exposed. The positive electrode 111a and the negative electrode 111a ′ as metal foils protruding from both ends of the electrode body 111 are respectively electrically conductive metal plates, that is, a positive current collector 112 and a negative current collector 112 ′. Connected.

絶縁シート111cは、ポリエステル、ポリエチレン、ポリフェニレンエーテル等の合成樹脂製の、薄いシート状の部材であり、後述する絶縁封止材113及び121とともに電池容器と電極体111とを絶縁する手段である。   The insulating sheet 111c is a thin sheet-like member made of a synthetic resin such as polyester, polyethylene, polyphenylene ether, etc., and is a means for insulating the battery container and the electrode body 111 together with insulating sealing materials 113 and 121 described later.

絶縁シート111cの巻回軸に沿った幅は、電極体本体111bよりも小さくなっており、したがって絶縁シート111cが捲かれた状態であっても、電極体111の両端の正極111a、負極111a´は露出しており、集電体112及び112´と直接接合し、電気的接続が確保されている。   The width of the insulating sheet 111c along the winding axis is smaller than that of the electrode body 111b. Therefore, even when the insulating sheet 111c is rolled, the positive electrode 111a and the negative electrode 111a ′ at both ends of the electrode body 111 are used. Is exposed and is directly joined to the current collectors 112 and 112 'to ensure electrical connection.

次に、集電体112の一端は、電極体111の表面と平行に延伸し、その表面には貫通孔112aが形成されている。又、他端は電極体111の側面に向かって屈曲し、電極体111の側面に露出した巻回状態の金属箔としての正極111aと共に、アルミニウム等の金属製の挟持板114に挟まれて超音波溶接等により接続、固定されている。負極側の集電体112´も同様の構成を有する。   Next, one end of the current collector 112 extends parallel to the surface of the electrode body 111, and a through hole 112a is formed on the surface. The other end bends toward the side surface of the electrode body 111 and is sandwiched between a positive electrode 111a as a wound metal foil exposed on the side surface of the electrode body 111 and sandwiched between metal clamping plates 114 such as aluminum. Connected and fixed by sonic welding or the like. The current collector 112 'on the negative electrode side has the same configuration.

蓋部120の両端には端子引出用の貫通孔が開口されている。なお、図11においては、正極側の貫通孔120aのみを示し、負極側の貫通孔は後述する部品の陰に隠れるため図示されない。蓋部120と集電体114との間には絶縁封止材113が位置している。絶縁封止材113は合成樹脂等の絶縁性及び一定の弾性を備えた合成樹脂製の部材であり、その表面には蓋部120の貫通孔120a及び集電体112の貫通孔112aと同心円をなす貫通孔113aが形成されている。   At both ends of the lid part 120, through holes for drawing out terminals are opened. In FIG. 11, only the positive electrode side through hole 120 a is shown, and the negative electrode side through hole is not shown because it is hidden behind a component to be described later. An insulating sealing material 113 is located between the lid 120 and the current collector 114. The insulating sealing material 113 is a synthetic resin member having insulating properties and a certain elasticity, such as a synthetic resin, and concentric with the through hole 120a of the lid 120 and the through hole 112a of the current collector 112 on its surface. A through hole 113a is formed.

更に、蓋部120の短辺側の端部近傍と重なるように絶縁封止材121が位置している。絶縁封止材121は絶縁封止材113と同様の合成樹脂製の部材であり、その表面には蓋部120の貫通孔120aと同心円をなす貫通孔121bが形成されている。又、絶縁封止材121の、蓋部120と対向する側には筒部121cが形成されており、貫通孔121bは筒部121c内を延伸している。筒部121cは貫通孔120a及び113aに対応した外形を有し、これら各貫通孔に嵌り込むようになっている。   Furthermore, the insulating sealing material 121 is positioned so as to overlap with the vicinity of the end on the short side of the lid 120. The insulating sealing material 121 is a member made of a synthetic resin similar to the insulating sealing material 113, and a through hole 121 b concentric with the through hole 120 a of the lid 120 is formed on the surface thereof. Moreover, the cylinder part 121c is formed in the side facing the cover part 120 of the insulating sealing material 121, and the through-hole 121b is extended in the cylinder part 121c. The cylindrical portion 121c has an outer shape corresponding to the through holes 120a and 113a, and is fitted into each of the through holes.

更に、絶縁封止材121の主面を蔽うように、電極端子130が配置されている。電極端子130は貫通孔121bと同心円状の貫通孔130aが設けられた、アルミニウム又はアルミニウム合金その他の導電性の金属製の板状の部材である。   Furthermore, the electrode terminal 130 is arrange | positioned so that the main surface of the insulating sealing material 121 may be covered. The electrode terminal 130 is a plate-shaped member made of aluminum, an aluminum alloy, or other conductive metal provided with a through-hole 130a concentric with the through-hole 121b.

又、電極端子130の貫通孔130aには固定部材131が挿入される。固定部材131は、アルミニウム、銅又はそれらの合金等の導電性の金属製部品であり、電極端子130と集電体112とを電気的に接続するとともに、蓋部120と電極体111とを機械的に結合するための部材である。   A fixing member 131 is inserted into the through hole 130 a of the electrode terminal 130. The fixing member 131 is a conductive metal part such as aluminum, copper, or an alloy thereof, and electrically connects the electrode terminal 130 and the current collector 112, and connects the lid 120 and the electrode body 111 to the machine. It is a member for combining.

上述した各部は、非水電解質二次電池100においては、以下のように組み合わされる。すなわち、蓋部120の貫通孔120a及び絶縁封止材113の貫通孔113aには、絶縁封止材121の筒部121cが貫通し、筒部121cの端面は、絶縁封止材113の主面とともに集電体112の主面に接触する。そして、固定部材131は、電極端子130の貫通孔130b、絶縁封止材121の貫通孔121b及び集電体112の貫通孔112aを貫通した状態で、その両端131a及び131bがかしめられる。   Each part mentioned above is combined as follows in the nonaqueous electrolyte secondary battery 100. That is, the cylindrical portion 121c of the insulating sealing material 121 passes through the through hole 120a of the lid portion 120 and the through hole 113a of the insulating sealing material 113, and the end surface of the cylindrical portion 121c is the main surface of the insulating sealing material 113. At the same time, it contacts the main surface of the current collector 112. The fixing member 131 is caulked at both ends 131a and 131b in a state of passing through the through hole 130b of the electrode terminal 130, the through hole 121b of the insulating sealing material 121, and the through hole 112a of the current collector 112.

かしめられた固定部材131の両端131a及び131bの外径はそれぞれ各貫通孔の内径より大きくなるため、電極端子130、絶縁封止材121,蓋部120、絶縁封止材113及び集電体112はこれら両端131a及び131bにより挟まれることで互いに圧着され、一体的に固定される。又、集電体112及び電極端子130は固定部材131により接続されることで電気的にも接続される。なお、固定部材131の側面は絶縁封止材121の筒部121cによって蔽われることとなり、蓋部120と固定部材131との間は絶縁状態が確保される。   Since the outer diameters of the both ends 131a and 131b of the caulking fixing member 131 are larger than the inner diameters of the respective through holes, the electrode terminal 130, the insulating sealing material 121, the lid 120, the insulating sealing material 113, and the current collector 112. Are sandwiched between these two ends 131a and 131b so that they are pressed together and fixed together. Further, the current collector 112 and the electrode terminal 130 are electrically connected by being connected by the fixing member 131. Note that the side surface of the fixing member 131 is covered with the cylindrical portion 121 c of the insulating sealing material 121, and an insulating state is ensured between the lid portion 120 and the fixing member 131.

一方、集電体112は、固定部材131のかしめられた先端131a及び絶縁封止材113により直接挟まれる基台部112bと、基台部112bの側端から直角に屈曲して図中下方に延伸し、発電素子111の両側面に露出する正極111a他の電極に接続される一対の腕部112cとを備える。したがって、発電素子111は、一対の腕部112cの主面同士及び基台部112bの下面に挟まれた空間内に配置される。   On the other hand, the current collector 112 is bent at a right angle from the side end of the base portion 112b and the base portion 112b directly sandwiched between the crimped tip 131a of the fixing member 131 and the insulating sealing material 113, and downward in the figure. A pair of arms 112c that are extended and connected to other electrodes of the positive electrode 111a exposed on both side surfaces of the power generation element 111 are provided. Therefore, the power generating element 111 is disposed in a space sandwiched between the main surfaces of the pair of arm portions 112c and the lower surface of the base portion 112b.

このような構成を備えたことにより、電極体111にて発生した電力は集電体112及び電極端子130を介して容器本体110の外に取り出される。具体的には、図示しない外部負荷の配線を電極端子130の主面に溶接固定することにより、非水電解質二次電池100と外部負荷との電気的接続を完成する。   With such a configuration, the electric power generated in the electrode body 111 is taken out of the container body 110 through the current collector 112 and the electrode terminal 130. Specifically, the external connection (not shown) is fixed to the main surface of the electrode terminal 130 by welding to complete the electrical connection between the non-aqueous electrolyte secondary battery 100 and the external load.

特開2011−049066号公報JP 2011-049066 A

従来の技術による非水電解質二次電池の構成は以上のようなものであるが、上記従来の技術においては、以下のような問題があった。   The configuration of the non-aqueous electrolyte secondary battery according to the conventional technique is as described above. However, the conventional technique has the following problems.

すなわち、非水電解質二次電池100の組立ては、電極端子130、絶縁封止材113、絶縁封止材121、集電体112及び電極体111を予め一体に組み合わせており、開口110xに電極体111を挿入するようにして蓋部120で容器本体110を密閉し、接合箇所をレーザ溶接することにより行う。   That is, the non-aqueous electrolyte secondary battery 100 is assembled by combining the electrode terminal 130, the insulating sealing material 113, the insulating sealing material 121, the current collector 112, and the electrode body 111 in advance, and the electrode body at the opening 110x. The container body 110 is hermetically sealed with the lid 120 so that 111 is inserted, and the joint is laser welded.

しかしながら、図13に示すように、電極体111において、正負各電極111a、111bに集電体112、112´を接合する際に、絶縁シート111cに覆われていない、正負各電極111a、111bの表面115、115´に集電体112が接触した場合、電極体111が損傷する恐れがあった。又、完成後の非水電解質二次電池100においても、長期間の使用に伴う電池容器の膨張、外部からの圧力等の原因で電池容器が変形した場合、集電体112と電極体111の表面とが接触し、短絡等の不具合を生ずる恐れがあった。   However, as shown in FIG. 13, in the electrode body 111, when the current collectors 112 and 112 ′ are joined to the positive and negative electrodes 111a and 111b, the positive and negative electrodes 111a and 111b that are not covered by the insulating sheet 111c. When the current collector 112 is in contact with the surfaces 115 and 115 ′, the electrode body 111 may be damaged. Further, even in the completed nonaqueous electrolyte secondary battery 100, when the battery container is deformed due to expansion of the battery container due to long-term use, pressure from the outside, etc., the current collector 112 and the electrode body 111 There was a risk of contact with the surface and problems such as short circuits.

このように、従来の技術による非水電解質二次電池のような蓄電素子においては、電極体と集電体との干渉に起因する不具合が生じる恐れがあるという課題があった。   As described above, in a power storage element such as a non-aqueous electrolyte secondary battery according to the prior art, there is a problem that a problem due to interference between the electrode body and the current collector may occur.

本発明は、上記の課題に鑑みてなされたものであり、電極体と集電体との干渉を低減することが可能な蓄電素子及びそれに用いられる電極体を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide an energy storage device capable of reducing interference between an electrode body and a current collector and an electrode body used therefor.

上記の目的を達成するために、本発明の第1の側面は、
素子容器と、
前記素子容器に設けられた電極端子と、
前記素子容器内に収容れる電極体と、
前記素子容器内に収容され、前記電極端子及び前記電極体に接続される集電体とを備え、
前記集電体は、
前記電極体から離隔して前記電極端子と接続される基台部と、
前記基台部から遠ざかるように湾曲又は屈曲する渡り部分と、前記渡り部分から延伸して前記電極体と接続される直線部分を含む、少なくとも一本の腕部とを有し、
前記電極体は、
両端にて前記腕部と接続される電極体本体と、
前記電極体本体の表面を覆う絶縁シートであって、前記集電体の前記基台部との対向面及び前記集電体の前記腕部の前記渡り部分との対向面を少なくとも覆う絶縁シートとを有する、蓄電素子である。
In order to achieve the above object, the first aspect of the present invention provides:
An element container;
An electrode terminal provided in the element container;
An electrode body housed in the element container ;
A current collector housed in the element container and connected to the electrode terminal and the electrode body ;
The current collector is
A base that is spaced apart from the electrode body and connected to the electrode terminal;
A transferring portion which is curved or bent away from the base portion, extending from the crossover portion including a straight portion connected to the electrode body, and at least one of the arms,
The electrode body is
An electrode body main body connected to the arm at both ends;
An insulating sheet covering the surface of the electrode body, the insulating sheet covering at least a surface facing the base portion of the current collector and a surface facing the bridging portion of the arm portion of the current collector; It is an electrical storage element which has.

又、本発明の第2の側面は、
前記絶縁シートの、前記集電体の前記基台部との対向面及び前記集電体の前記渡り部分との対向面を覆う部分は、前記電極体本体の前記両端まで達している、
本発明の第1の側面の蓄電素子である
The second aspect of the present invention is
The portion of the insulating sheet that covers the surface facing the base portion of the current collector and the surface facing the crossing portion of the current collector reaches the both ends of the electrode body.
It is an electrical storage element of the 1st side of the present invention.

又、本発明の第の側面は、
前記電極体本体は、
正極部材及び負極部材が、セパレータを介して巻回されてなる巻回体の構成を有し、
前記絶縁シートは、
前記巻回体の最外周に、前記巻回体とは独立して巻回されている、
本発明の第1又は第2の側面の蓄電素子である。
The third aspect of the present invention is
The electrode body is
The positive electrode member and the negative electrode member have a configuration of a wound body that is wound through a separator,
The insulating sheet is
The outermost periphery of the wound body, wherein the winding body are wound independently,
It is an electrical storage element of the 1st or 2nd side surface of this invention.

又、本発明の第の側面は、
前記電極体本体は、
正極部材及び負極部材が、セパレータを介して巻回されてなる巻回体の構成を有し、
前記絶縁シートは、
前記電極体本体の前記巻回体の最外周に巻回された前記セパレータである、
本発明の第1又は第2のいずれかの側面の蓄電素子である。
The fourth aspect of the present invention is
The electrode body is
The positive electrode member and the negative electrode member have a configuration of a wound body that is wound through a separator,
The insulating sheet is
Is the separator wound on the outermost periphery of the wound body of the electrode body,
It is an electrical storage element of the 1st or 2nd side surface of this invention.

又、本発明の第5の側面は、
前記絶縁シートは、その巻回軸方向における幅が、
前記集電体の前記基台部との対向面及び前記集電体の前記渡り部分との対向面に対応する部分にて最も大きい、
本発明の第3又は第4の側面の蓄電素子である。
The fifth aspect of the present invention is
The insulating sheet has a width in the winding axis direction,
The largest in the portion corresponding to the surface facing the base portion of the current collector and the surface facing the crossover portion of the current collector,
It is an electrical storage element of the 3rd or 4th side surface of this invention.

又、本発明の第の側面は、
前記絶縁シートは、前記電極体本体に少なくとも一周以上巻回されており、
前記絶縁シートの、前記電極体の表面に露出する一端は、巻回軸を間に挟んで前記集電体と前記電極端子との接続箇所に対向している、
本発明の第1から第のいずれかの側面の蓄電素子である。
The sixth aspect of the present invention is
The insulating sheet is wound around the electrode body at least one turn,
One end of the insulating sheet exposed on the surface of the electrode body is opposed to a connection portion between the current collector and the electrode terminal with a winding shaft in between.
It is an electrical storage element of the 1st to 5th side surface of this invention.

又、本発明の第の側面は、
前記絶縁シートは、前記電極体本体に少なくとも一周以上巻回されており、
前記絶縁シートの、前記電極体の表面に露出する一端は、前記集電体と前記電極端子との接続箇所に直接対向している、
本発明の第1から第のいずれかの側面の蓄電素子である。
The seventh aspect of the present invention is
The insulating sheet is wound around the electrode body at least one turn,
One end of the insulating sheet exposed on the surface of the electrode body is directly opposed to a connection portion between the current collector and the electrode terminal.
It is an electrical storage element of the 1st to 5th side surface of this invention.

又、本発明の第の側面は、
前記絶縁シートは、前記集電体と前記電極端子との接続箇所に対向する部分の厚みが、他の部分の厚みより大きい、
本発明の第1から第のいずれかの側面の蓄電素子である。
The eighth aspect of the present invention is
The insulating sheet has a thickness that is greater than the thickness of the other portion, the thickness of the portion facing the connection location between the current collector and the electrode terminal,
It is an electrical storage element of the 1st to 7th side surface of this invention.

又、本発明の第の側面は、
前記絶縁シートは、
前記集電体と前記電極端子との接続箇所に対向する部分が、前記電極体本体の表面上にて蛇腹状に折り畳まれている、
本発明の第1から第のいずれかの側面の蓄電素子である。
The ninth aspect of the present invention is
The insulating sheet is
The portion facing the connecting portion between the current collector and the electrode terminal is folded in a bellows shape on the surface of the electrode body,
It is an electrical storage element of the 1st to 8th side surface of this invention.

又、本発明の第10の側面は、
前記集電体の前記腕部は、湾曲した縁面を有する、
本発明の第1から第9のいずれかの側面の蓄電素子である。
The tenth aspect of the present invention provides
The arm portion of the current collector has a curved edge surface;
It is an electrical storage element of the 1st thru | or 9th side surface of this invention.

又、本発明の第11の側面は、
前記素子容器の内壁には凹部が設けられており、
前記集電体の前記基台部は、前記凹部内に位置している、
本発明の第から第10のいずれかの側面の蓄電素子である。
The eleventh aspect of the present invention is
The inner wall of the element container is provided with a recess,
The base of the current collector is located in the recess,
1 is a power storage device according to any one of the first to tenth aspects of the present invention.

以上のような本発明によれば、蓄電素子において電極体と集電体との干渉を低減することが可能になるという効果を有する。   According to the present invention as described above, it is possible to reduce interference between the electrode body and the current collector in the power storage element.

本発明の実施の形態に係る非水電解質二次電池の構成を示す分解斜視図1 is an exploded perspective view showing a configuration of a nonaqueous electrolyte secondary battery according to an embodiment of the present invention. 本発明の実施の形態に係る非水電解質二次電池の構成を示す断面図Sectional drawing which shows the structure of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention 本発明の実施の形態に係る非水電解質二次電池の構成を示す要部断面図Sectional drawing which shows the structure of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention 本発明の実施の形態に係る非水電解質二次電池の電極体本体の構成を示す斜視図The perspective view which shows the structure of the electrode body main body of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention. 本発明の実施の形態に係る非水電解質二次電池の電極体の構成を示す斜視図The perspective view which shows the structure of the electrode body of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention. (a)本発明の実施の形態に係る非水電解質二次電池の絶縁シートの構成を示す平面図(b)本発明の実施の形態に係る非水電解質二次電池の絶縁シートの巻回状態を説明するための図(A) The top view which shows the structure of the insulating sheet of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) The winding state of the insulating sheet of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention Illustration for explaining (a)本発明の実施の形態に係る非水電解質二次電池の絶縁シートの構成を示す平面図(b)本発明の実施の形態に係る非水電解質二次電池の絶縁シートの巻回状態を説明するための図(A) The top view which shows the structure of the insulating sheet of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) The winding state of the insulating sheet of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention Illustration for explaining (a)本発明の実施の形態に係る非水電解質二次電池の絶縁シートの構成を示す平面図(b)本発明の実施の形態に係る非水電解質二次電池の絶縁シートの巻回状態を説明するための図(A) The top view which shows the structure of the insulating sheet of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) The winding state of the insulating sheet of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention Illustration for explaining (a)本発明の実施の形態に係る非水電解質二次電池の絶縁シートの構成を示す平面図(b)本発明の実施の形態に係る非水電解質二次電池の絶縁シートの巻回状態を説明するための図(A) The top view which shows the structure of the insulating sheet of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) The winding state of the insulating sheet of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention Illustration for explaining 本発明の実施の形態に係る非水電解質二次電池の電極体の他の構成を示す斜視図The perspective view which shows the other structure of the electrode body of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention. 図1の本発明の実施の形態に係る非水電解質二次電池の組立て状態を示す等角投影図FIG. 1 is an isometric view showing the assembled state of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention. (a)図1の本発明の実施の形態に係る非水電解質二次電池の組立て状態を示す平面図(b)図1の本発明の実施の形態に係る非水電解質二次電池の組立て状態を示す底面図(A) FIG. 1 is a plan view showing an assembled state of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention. (B) FIG. 1 is an assembled state of the nonaqueous electrolyte secondary battery according to the embodiment of the present invention. Bottom view showing 従来の技術による非水電解質二次電池の構成を示す分解斜視図An exploded perspective view showing a configuration of a conventional non-aqueous electrolyte secondary battery

以下、本発明の実施の形態について図面を参照しながら説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図1は、本発明の実施の形態に係る非水電解質二次電池1の模式的な構成を示す分解斜視図であり、図2は、図1の非水電解質二次電池1の蓋部20の長手方向に平行、且つ接続部材23bの延伸方向と直交する図中直線Xによる模式的断面図であり、図3は、図1の非水電解質二次電池1の蓋部20の短手方向に平行、且つ接続部材23bの延伸方向と直交する図中直線Yによる要部断面図である。   FIG. 1 is an exploded perspective view showing a schematic configuration of a non-aqueous electrolyte secondary battery 1 according to an embodiment of the present invention, and FIG. 2 is a lid portion 20 of the non-aqueous electrolyte secondary battery 1 of FIG. FIG. 3 is a schematic cross-sectional view taken along a straight line X in the drawing parallel to the longitudinal direction of the connecting member 23b and orthogonal to the extending direction of the connecting member 23b, and FIG. 3 is a short direction of the lid portion 20 of the nonaqueous electrolyte secondary battery 1 of FIG. FIG. 5 is a cross-sectional view of the principal part taken along a straight line Y in the drawing that is parallel to the cross section and orthogonal to the extending direction of the connecting member 23b.

図1に示すように、本実施の形態の非水電解質二次電池1は、アルミニウム製の板状の蓋部20と開口10xを有する開口箱状の容器本体10から構成される外形六面体の電池容器を、外装として備える。   As shown in FIG. 1, the nonaqueous electrolyte secondary battery 1 of the present embodiment is a hexahedron battery that includes an aluminum plate-like lid 20 and an open box-like container body 10 having an opening 10x. A container is provided as an exterior.

電極体11は、帯状の電極である正極と負極を、セパレータを介して長円筒形に巻回してなる電極体本体30と、電極体本体30の更に外周に巻回された絶縁シート40とを備える。   The electrode body 11 is composed of an electrode body body 30 formed by winding a positive electrode and a negative electrode, which are band-like electrodes, into a long cylindrical shape via a separator, and an insulating sheet 40 wound around the outer periphery of the electrode body body 30. Prepare.

電極体本体30は、従来例と同様、巻回された状態において、正極及び負極が巻回軸の両端の異なる方向に位置ずれし、電極体11の両端にそれぞれ位置する。更に、各電極の端部は活物質が担持されておらず、基材である金属箔が露出している。電極体11の両端部にそれぞれはみ出した金属箔としての正極11a、負極11a´には、導電性の金属部材から構成された、正極側の集電体12及び負極側の集電体12´がそれぞれ接続される。なお、電極体11の巻回軸の延伸方向、すなわち正極11aと負極11a´とを結ぶ、又は集電体12と12´とを結ぶ直線は、図中直線Xに平行であり、電極体11の巻回軸に直交する方向、すなわち正極11aと負極11a´とを結ぶ、又は集電体12と12´とを結ぶ直線に直交する方向は、図中直線Yに平行な位置関係となっている。   In the wound state, the electrode body 30 is positioned in both ends of the electrode body 11 in such a manner that the positive electrode and the negative electrode are displaced in different directions at both ends of the winding shaft. Furthermore, the active material is not supported at the end of each electrode, and the metal foil as the base material is exposed. The positive electrode 11a and the negative electrode 11a ′ as metal foils protruding from both ends of the electrode body 11 include a positive current collector 12 and a negative current collector 12 ′ made of a conductive metal member. Each is connected. In addition, the extending direction of the winding axis of the electrode body 11, that is, the straight line connecting the positive electrode 11a and the negative electrode 11a 'or connecting the current collectors 12 and 12' is parallel to the straight line X in the figure, and the electrode body 11 The direction perpendicular to the winding axis of the electrode, that is, the direction perpendicular to the straight line connecting the positive electrode 11a and the negative electrode 11a 'or the current collector 12 and 12' is a positional relationship parallel to the straight line Y in the figure. Yes.

絶縁シート40もまた、従来例同様、ポリエステル、ポリエチレン、ポリフェニレンエーテル等の合成樹脂製の、薄いシート状の部材であり、後述する絶縁封止材113及び121とともに電池容器と電極体111とを絶縁する手段である。   The insulating sheet 40 is also a thin sheet-like member made of a synthetic resin such as polyester, polyethylene, polyphenylene ether, etc., as in the conventional example, and insulates the battery container and the electrode body 111 together with insulating sealing materials 113 and 121 described later. It is means to do.

なお、電極体本体30及び絶縁シート40の構成については、後に更に詳細に説明する。   The configurations of the electrode body 30 and the insulating sheet 40 will be described in detail later.

次に、集電体12の一端は、電極体11の表面と平行に延伸した板状の構成を有し、その表面には貫通孔12aが形成されている。又、他端は電極体11の側面に向かって湾曲し、電極体11の側面に露出した巻回状態の金属箔としての正極11aに、超音波溶接等により接続、固定されている。負極側の集電体12´も同様の構成を有する。又、図2に示すように、集電体12と電極体11の正極11aとの接続箇所15は、集電体12の上記他端のうち、容器本体10の深さ方向に沿って直進する部分と電極体11の正極11aとが対向する位置である。図示省略したが負極11a´側も同様である。   Next, one end of the current collector 12 has a plate-like configuration extending parallel to the surface of the electrode body 11, and a through hole 12a is formed on the surface. The other end is curved toward the side surface of the electrode body 11, and is connected and fixed to the positive electrode 11a as a wound metal foil exposed on the side surface of the electrode body 11 by ultrasonic welding or the like. The current collector 12 'on the negative electrode side has the same configuration. Further, as shown in FIG. 2, the connection portion 15 between the current collector 12 and the positive electrode 11 a of the electrode body 11 goes straight along the depth direction of the container body 10 among the other end of the current collector 12. This is a position where the portion and the positive electrode 11a of the electrode body 11 face each other. Although not shown, the same applies to the negative electrode 11a ′ side.

又、当該接続箇所は、図1に示すように、樹脂製の挟持板14により被覆される。なお、図2においては説明のため狭持板14は省略した。   Further, as shown in FIG. 1, the connection portion is covered with a resin sandwich plate 14. In FIG. 2, the sandwiching plate 14 is omitted for explanation.

次に、本実施の形態1の蓋部20は、その両端には、表面20aから盛り上がった凸部21が形成されている。凸部21はその上部が表面20aと平行な平面21bを形成しており、かつ平面21b上に貫通孔21aが開口されている。なお、図1においては、正極側の貫通孔21aのみを示し、負極側の貫通孔は後述する絶縁封止材の陰に隠れるため図示されない。   Next, the lid portion 20 of the first embodiment has convex portions 21 raised from the surface 20a at both ends thereof. The upper portion of the convex portion 21 forms a plane 21b parallel to the surface 20a, and a through hole 21a is opened on the plane 21b. In FIG. 1, only the through hole 21a on the positive electrode side is shown, and the through hole on the negative electrode side is not shown because it is hidden behind an insulating sealing material described later.

蓋部20と集電体12との間には、集電体12に覆い被さるように絶縁封止材13が位置している。絶縁封止材13は合成樹脂等の絶縁性及び一定の弾性を備えた合成樹脂製の部材であり、その表面には蓋部20の貫通孔21a及び集電体12の貫通孔12aと同心円をなす貫通孔13aが形成されている。   Between the lid 20 and the current collector 12, an insulating sealing material 13 is positioned so as to cover the current collector 12. The insulating sealing material 13 is a synthetic resin member having an insulating property and a certain elasticity, such as a synthetic resin, and concentric with the through hole 21a of the lid portion 20 and the through hole 12a of the current collector 12 on the surface thereof. A through-hole 13a is formed.

更に、蓋部20の凸部21に覆い被さるように絶縁封止材22が位置している。絶縁封止材22は絶縁封止材13と同様の合成樹脂製の部材であり、その表面には蓋部20の貫通孔21aと同心円をなす貫通孔22dが開口されている。又、絶縁封止材22の、蓋部20と対向する側には筒部22cが形成されており、貫通孔22dは筒部22c内を延伸している。筒部22cは貫通孔21a及び13aに対応した外形を有し、これら各貫通孔に嵌り込むようになっている。   Furthermore, the insulating sealing material 22 is positioned so as to cover the convex portion 21 of the lid portion 20. The insulating sealing material 22 is a member made of synthetic resin similar to the insulating sealing material 13, and a through hole 22 d concentric with the through hole 21 a of the lid portion 20 is opened on the surface thereof. Moreover, the cylindrical part 22c is formed in the side facing the cover part 20 of the insulating sealing material 22, and the through-hole 22d is extended in the cylindrical part 22c. The cylindrical portion 22c has an outer shape corresponding to the through holes 21a and 13a, and is fitted into each of the through holes.

更に、絶縁封止材22の表面には枠体22eが形成されており、貫通孔21dは枠体22eで囲まれた主面22b上に開口されている。   Further, a frame body 22e is formed on the surface of the insulating sealing material 22, and the through hole 21d is opened on a main surface 22b surrounded by the frame body 22e.

次に、絶縁封止材22の主面22b内に載置されるように、電極端子23が配置されている。電極端子23は枠体22eの内形に対応した平面形状を有する、アルミニウム又はアルミニウム合金その他の導電性の金属製の電極部23aと電極部23aの表面から突き出した接続部材23bとから構成される。接続部材23bはアルミニウム、銅又はそれらの合金等の導電性の金属製部品であり、電極部23aと集電体12とを電気的に接続するとともに、蓋部20と電極体11とを機械的に結合する役割を果たす。   Next, the electrode terminal 23 is arrange | positioned so that it may be mounted in the main surface 22b of the insulating sealing material 22. FIG. The electrode terminal 23 has a planar shape corresponding to the inner shape of the frame 22e, and is composed of an electrode portion 23a made of aluminum or an aluminum alloy or other conductive metal and a connection member 23b protruding from the surface of the electrode portion 23a. . The connection member 23b is a conductive metal part such as aluminum, copper, or an alloy thereof, and electrically connects the electrode portion 23a and the current collector 12 and mechanically connects the lid portion 20 and the electrode body 11 to each other. Play a role in binding.

なお、電極端子23において、電極部23aと接続部材23bとは、鍛造、鋳造等によって同一の素材から構成されていてもよいし、独立した2つの異種又は同種材料の素材を一体成形することにより構成されていてもよい。   In the electrode terminal 23, the electrode portion 23a and the connecting member 23b may be formed of the same material by forging, casting, or the like, or by integrally forming two independent or different materials. It may be configured.

又、上述した各部の組合せの態様は、基本的には従来例と同様である。すなわち、図3に示すように、蓋部20の貫通孔21a及び絶縁封止材13の貫通孔13aには、絶縁封止材22の筒部22cが貫通しており、筒部22cの端面は、絶縁封止材13の主面とともに、集電体12の主面に接している。そして、電極端子23の接続部材23bは、絶縁封止材21の貫通孔21a及び集電体12の貫通孔12aを貫通した状態で、その先端がかしめられ、かしめ端23cに整形される。   The combination of the above-described parts is basically the same as that in the conventional example. That is, as shown in FIG. 3, the cylindrical portion 22c of the insulating sealing material 22 passes through the through hole 21a of the lid portion 20 and the through hole 13a of the insulating sealing material 13, and the end surface of the cylindrical portion 22c is The main surface of the current collector 12 is in contact with the main surface of the insulating sealing material 13. And the connection member 23b of the electrode terminal 23 is caulked at the tip in a state of passing through the through hole 21a of the insulating sealing material 21 and the through hole 12a of the current collector 12, and shaped into a caulking end 23c.

かしめ端23cの外径は各貫通孔より大きいため、絶縁封止材22、蓋部20、絶縁封止材13及び集電体12は、電極端子23の電極部23aとかしめ端23cとに挟まれることで互いに圧着され、一体的に固定される。又、集電体12及び電極端子23は接続部材23bを介することで電気的にも接続される。なお、接続部材23bの側面は絶縁封止材22の筒部22cによって蔽われているため、蓋部20と接続部材23bとの間は絶縁状態が確保されている。   Since the outer diameter of the caulking end 23c is larger than each through hole, the insulating sealing material 22, the lid portion 20, the insulating sealing material 13 and the current collector 12 are sandwiched between the electrode portion 23a of the electrode terminal 23 and the caulking end 23c. As a result, they are crimped together and fixed together. The current collector 12 and the electrode terminal 23 are also electrically connected through the connection member 23b. In addition, since the side surface of the connecting member 23b is covered with the cylindrical portion 22c of the insulating sealing material 22, an insulating state is ensured between the lid portion 20 and the connecting member 23b.

又、図3に示すように、本実施の形態の蓋部20は、その裏側に、容器本体10の開口10xに嵌合するように、容器本体10の端面と当接する側端の内側に形成され、当該を含めた他の部分よりも厚みが大きい枠部20bを有している。又、蓋部20の、凸部21を除いた部分の厚みは、枠部20bにおいて最も大きく、次いで側端、次いで枠部20bで囲まれた裏面20c、の順に小さくなっている。   Also, as shown in FIG. 3, the lid portion 20 of the present embodiment is formed on the back side, inside the side end that comes into contact with the end surface of the container body 10 so as to fit into the opening 10x of the container body 10. The frame portion 20b is thicker than other portions including the frame portion 20b. Moreover, the thickness of the part except the convex part 21 of the cover part 20 is the largest in the frame part 20b, and becomes small in order of the back surface 20c enclosed by the side edge then the frame part 20b.

又、蓋部20は、その構成部材の断面の厚みは一様であり、したがって、凸部21は、蓋部20の裏面20c上に更に設けられた凹みに対応した、部材の形状変化として形成されている。以下、裏面20c上の凹みを凹部21xと称する。   Further, the lid portion 20 has a uniform cross-sectional thickness, and thus the convex portion 21 is formed as a member shape change corresponding to a dent further provided on the back surface 20c of the lid portion 20. Has been. Hereinafter, the recess on the back surface 20c is referred to as a recess 21x.

更に、凹部21xは、蓋部20の長手方向に沿って、その根元から表面20aに向かって開くように傾斜した、テーパ面としての壁面21dを有する。そして絶縁封止材13は、凹部21xの内側に、これらの壁面に囲まれるように配置されている。   Furthermore, the concave portion 21x has a wall surface 21d as a tapered surface that is inclined along the longitudinal direction of the lid portion 20 so as to open from the base toward the surface 20a. And the insulating sealing material 13 is arrange | positioned so that it may be enclosed by these wall surfaces inside the recessed part 21x.

絶縁封止材13もまた、その周縁に電極体11に向かって立ち上がった壁面を有しており、開口を有するトレイ状の形状となっている。この開口の内側に、集電体12の根元部分である、基台部12bと、貫通孔12aを介して突出したかしめ端23cとが位置している。   The insulating sealing material 13 also has a wall surface rising toward the electrode body 11 at the periphery thereof, and has a tray-like shape having an opening. Inside the opening, a base portion 12b, which is a base portion of the current collector 12, and a caulking end 23c protruding through the through hole 12a are located.

同様に、蓋部20の凸部21の外側に位置している絶縁封止材22も、凸部21に対応したトレイ状の形状を有する。又、凸部21の壁面21dの形状に対応して、絶縁封止材の側壁22aは、蓋部20の表面20aに対して、長手方向においては傾斜している。   Similarly, the insulating sealing material 22 positioned outside the convex portion 21 of the lid portion 20 also has a tray shape corresponding to the convex portion 21. Corresponding to the shape of the wall surface 21 d of the convex portion 21, the side wall 22 a of the insulating sealing material is inclined in the longitudinal direction with respect to the surface 20 a of the lid portion 20.

次に、集電体12は、一枚の金属板をプレス等により屈曲加工することにより形成されており、概略平板状の基台部12bと、基台部12の両端から延伸する一対の腕部12cとを備える。   Next, the current collector 12 is formed by bending a single metal plate with a press or the like, and has a substantially flat base portion 12b and a pair of arms extending from both ends of the base portion 12. Part 12c.

図1及び図3に示すように、基台部12bは、貫通孔12aが開口された外形平板状の部材で、その縁辺は、蓋部20の凹部21xの内壁である壁面21dに対応して、電極体11から屈曲している。   As shown in FIG. 1 and FIG. 3, the base portion 12 b is an outer shape flat plate member having a through hole 12 a opened, and an edge thereof corresponds to a wall surface 21 d that is an inner wall of the concave portion 21 x of the lid portion 20. The electrode body 11 is bent.

又、腕部12cは、電極体11の側面に対応して、基台部12bから容器本体10の底に向かって延伸する外形矩形状の平板であって、集電体12全体においては一対で平行面を形成する。図3に示すように、一対の腕部12は、共に基台部12bから離れる向きに広がるように延伸する渡り部分12c3と、渡り部分12c3から屈曲して、基台部12bに直交して図中下方に延伸する直線部分12c4とから構成され、直線部分12c4の対向した平行面内に電極体11を挟み込んで接続している。   The arm portions 12c correspond to the side surfaces of the electrode body 11, and are external rectangular plates extending from the base portion 12b toward the bottom of the container body 10, and are paired in the current collector 12 as a whole. Form parallel planes. As shown in FIG. 3, the pair of arm portions 12 are both a transition portion 12c3 extending so as to spread away from the base portion 12b, a bent portion from the transition portion 12c3, and perpendicular to the base portion 12b. The electrode body 11 is sandwiched and connected in parallel planes of the linear portion 12c4 that are opposed to each other.

更に、図1及び図2に示すように、集電体12の腕部12cは、図中電極体11の正極11aと負極11a´とに渡る側面から見て、貫通孔12aから電極体11の側端に向かって後退する方向、すなわち集電体12の基台部12bから遠ざかるに向きに湾曲する渡り部分12c1と、渡り部分12c1から屈曲して、基台部12bに直交して図中下方に延伸する直線部分12c2とから構成される。   Further, as shown in FIGS. 1 and 2, the arm portion 12 c of the current collector 12 is formed from the through-hole 12 a of the electrode body 11 as viewed from the side surface across the positive electrode 11 a and the negative electrode 11 a ′ of the electrode body 11. A crossing portion 12c1 that curves backward in the direction toward the side end, that is, away from the base portion 12b of the current collector 12, and is bent from the crossing portion 12c1 and is orthogonal to the base portion 12b and downward in the figure. It is comprised from the linear part 12c2 extended | stretched.

なお、図2及び図3に示すように、渡り部分12c3と直線部分12c4との境界L2と、渡り部分12c1と直線部分12c2との境界L1は一致しない。そして、直線部分12c4と電極体11の各電極との接続位置は領域15として示される。なお、直線部分12c4(又は直線部分12c2)の端部は丸みを持たせており、これにより組立て時に電極体11の表面に傷がつくのを防ぐようにしているが、端部の形状は角を持たせるようにしてもよい。   2 and 3, the boundary L2 between the transition portion 12c3 and the straight portion 12c4 and the boundary L1 between the transition portion 12c1 and the straight portion 12c2 do not match. A connection position between the straight portion 12c4 and each electrode of the electrode body 11 is indicated as a region 15. Note that the end of the straight portion 12c4 (or the straight portion 12c2) is rounded to prevent the surface of the electrode body 11 from being scratched during assembly. You may make it have.

次に、図4を参照して、電極体11の構成を更に詳細に説明する。ただし図4は電極体本体30の構成を示す部分展開図である。   Next, the configuration of the electrode body 11 will be described in more detail with reference to FIG. However, FIG. 4 is a partial development view showing the configuration of the electrode body 30.

図4に示すように、電極体本体30は、巻回軸Sに対し、最内周から外周に向かって積層された、シート状の正極部材31、セパレータ33、負極部材32及びセパレータ34の各部材を巻回し、巻回軸Sに対する断面形状が長円筒形状となるよう成型されている。   As shown in FIG. 4, the electrode body 30 is composed of a sheet-like positive electrode member 31, a separator 33, a negative electrode member 32, and a separator 34 that are stacked from the innermost periphery to the outer periphery with respect to the winding axis S. The member is wound so that the cross-sectional shape with respect to the winding axis S is a long cylindrical shape.

なお、正極部材31は、例えば帯状のアルミニウム箔の表面に正極活物質を担持させて構成し、負極部材32は、例えば帯状の銅箔の表面に負極活物質を担持させて構成される。電極体本体30においては、正極部材31及び負極部材32は、それぞれ帯状の片方の側端部に活物質を塗布しない未塗工部を設けておき、この未塗工部で電極11a及び11a´をそれぞれ形成する。そして、正極部材31及び負極部材32は、巻回の際に、巻回軸Sに沿って互いに端面方向にずらすことにより、長円筒形の一方の端面には正極11aのみがはみ出し、他方の端面には負極11a´のみがはみ出すようにしている。   The positive electrode member 31 is configured, for example, by supporting a positive electrode active material on the surface of a strip-shaped aluminum foil, and the negative electrode member 32 is configured, for example, by supporting a negative electrode active material on the surface of a strip-shaped copper foil. In the electrode body 30, each of the positive electrode member 31 and the negative electrode member 32 is provided with an uncoated portion to which no active material is applied at one side end of the belt-like shape, and the electrodes 11 a and 11 a ′ are provided at the uncoated portion. Respectively. When the positive electrode member 31 and the negative electrode member 32 are wound, the positive electrode member 11 and the negative electrode member 32 are shifted from each other along the winding axis S in the direction of the end surface, so that only the positive electrode 11a protrudes from one end surface of the long cylindrical shape. Only the negative electrode 11a 'protrudes.

一方、セパレータ33及び34は、高い放電性や電解質の保液性を示す多孔膜や不織布等を基材として用いる。セパレータ33及び34を構成する具体的な材料としては、例えばポリアクリレートや、ポリエチレン等に代表されるポリオレフィン系樹脂、ポリエチレンテレフタレート等に代表されるポリエステル系樹脂、ポリフッ化ビニリデン等のフッ素樹脂、ポリイミド(PI)、ポリアミドイミド(PAI)、ポリエーテルエーテルケトン(PEEK)、セルロース等を挙げることができる。   On the other hand, the separators 33 and 34 use, as a base material, a porous film, a nonwoven fabric, or the like that exhibits high discharge performance and electrolyte retention. Specific materials constituting the separators 33 and 34 include, for example, polyacrylate, polyolefin resin typified by polyethylene, polyester resin typified by polyethylene terephthalate, fluorine resin such as polyvinylidene fluoride, polyimide ( PI), polyamideimide (PAI), polyetheretherketone (PEEK), cellulose and the like.

以上の構成において、容器本体10と蓋部20との組合せは本発明の素子容器に相当する。又、電極端子23は本発明の電極端子に相当し、集電体12は本発明の集電体に相当する。   In the above configuration, the combination of the container body 10 and the lid 20 corresponds to the element container of the present invention. The electrode terminal 23 corresponds to the electrode terminal of the present invention, and the current collector 12 corresponds to the current collector of the present invention.

又、蓋部20の凹部21xは本発明の凹部に相当し、集電体12の基台部12b及び腕部12cは、それぞれ本発明の基台部及び腕部に相当する。又、絶縁封止材13は本発明の絶縁部材に相当する。   The concave portion 21x of the lid portion 20 corresponds to the concave portion of the present invention, and the base portion 12b and the arm portion 12c of the current collector 12 correspond to the base portion and the arm portion of the present invention, respectively. The insulating sealing material 13 corresponds to the insulating member of the present invention.

又、電極体11は本発明の電極体に相当し、電極体本体30は本発明の電極体本体に相当し、正極部材31は本発明の正極部材に、負極部材31は本発明の負極部材にそれぞれ相当し、絶縁シート40は本発明の絶縁体に相当する。又、セパレータ33及び34は本発明のセパレータに相当する。   The electrode body 11 corresponds to the electrode body of the present invention, the electrode body main body 30 corresponds to the electrode body of the present invention, the positive electrode member 31 corresponds to the positive electrode member of the present invention, and the negative electrode member 31 corresponds to the negative electrode member of the present invention. The insulating sheet 40 corresponds to the insulator of the present invention. The separators 33 and 34 correspond to the separator of the present invention.

以上のような構成を備えた本実施の形態の非水電解質二次電池1は、電極体11として、電極体本体30の、集電体12と対向する部分全体を被覆する絶縁シート40を備えたことを特徴とする。   The nonaqueous electrolyte secondary battery 1 of the present embodiment having the above-described configuration includes an insulating sheet 40 that covers the entire portion of the electrode body 30 facing the current collector 12 as the electrode body 11. It is characterized by that.

すなわち、本実施の形態の絶縁シート40は、図5に示すように、電極体本体30に更に巻回され、その表面を被覆するシート本体42と、シート本体42の両端に設けられた、その下底同士が対向してシート本体42に連続している外形台形のタブ41a及び41a´とを有する。   That is, as shown in FIG. 5, the insulating sheet 40 of the present embodiment is further wound around the electrode body 30, and the sheet body 42 that covers the surface of the insulating sheet 40 is provided at both ends of the sheet body 42. The outer bottom trapezoidal tabs 41 a and 41 a ′ that are continuous with the sheet main body 42 with the bottoms facing each other are provided.

タブ41a及び41a´の両端の間隔は、正極11aの端面と負極11a´の端面との間隔に等しく、したがってタブ41a及び41a´は電極体本体30の全幅を被覆する。   The distance between both ends of the tabs 41 a and 41 a ′ is equal to the distance between the end face of the positive electrode 11 a and the end face of the negative electrode 11 a ′, so that the tabs 41 a and 41 a ′ cover the entire width of the electrode body 30.

又、タブ41a及び41a´は、長円筒形状の電極体本体30の、短軸側の表面であって、図1及び図3に示すように、集電体12に対向する側に位置している。特に図3に示すように、絶縁シート40において、タブ41a及び41a´が占める領域は、図1中の直線Xに直交する断面形状において、集電体12が接続部材23のかしめ端23cにより圧着されている基台部12b及び腕部12cの渡り部分12c3のそれぞれの内壁に対向する対向面Rを少なくとも含むことが望ましい。ただし、図中において、電極体11と接続する領域15に含まれない、直線部分12c4と対向する部分を占めるようにしてもよい。   The tabs 41a and 41a 'are the surfaces on the short axis side of the long cylindrical electrode body 30, and are located on the side facing the current collector 12, as shown in FIGS. Yes. In particular, as shown in FIG. 3, in the insulating sheet 40, the region occupied by the tabs 41 a and 41 a ′ has a cross-sectional shape orthogonal to the straight line X in FIG. 1 and the current collector 12 is crimped by the caulking end 23 c of the connecting member 23. It is desirable to include at least a facing surface R that faces the inner walls of the base portion 12b and the transition portion 12c3 of the arm portion 12c. However, in the drawing, it may occupy a portion that is not included in the region 15 connected to the electrode body 11 and that faces the linear portion 12c4.

又、図2に示すように、絶縁シート40のタブ41a及び41a´の占める領域は、集電体12の渡り部分12c1と直線部分12c2との境界L1より直線部分12c2寄り、すなわち絶縁シート40は少なくとも渡り部分12c1に対向して被覆されていることが望ましい。 Further, as shown in FIG. 2, the area occupied by the tabs 41a and 41a' the insulation sheet 40, the linear portion 12c2 closer than the boundary L1 between the bridge parts 12c1 and the linear portion 12c2 of the collector 12, namely an insulating sheet 40 It is desirable to cover at least the crossing portion 12c1.

このような構成を備えたことにより、電極体11は、集電体12に対しては常に絶縁シート40で被覆された面のみを向けることとなる。電極体本体に集電体が直接接触する恐れを回避して、電極体と集電体との干渉に起因する不具合を未然に防止、又はその発生の可能性を低減することが可能となる。   By providing such a configuration, the electrode body 11 always faces only the surface covered with the insulating sheet 40 with respect to the current collector 12. It is possible to avoid the possibility that the current collector is in direct contact with the electrode body and to prevent or reduce the possibility of occurrence of defects due to interference between the electrode body and the current collector.

更に、図2に示すように、タブ41a及び41a´以外の幅は狭く、従来例の絶縁シートと同様、絶縁シート40は、正極11a及び負極11´aと集電体12及び12´の接続部分は迂回して、他の部分を被覆している。すなわち、絶縁シート40は絶縁部材と緩衝材とを一体化した構成を有し、非水電解質二次電池1の内部構成及び製造工程の双方の簡略化を実現している。   Further, as shown in FIG. 2, the widths other than the tabs 41a and 41a ′ are narrow, and the insulating sheet 40 is connected to the current collectors 12 and 12 ′ as in the conventional insulating sheet. The part bypasses and covers other parts. That is, the insulating sheet 40 has a configuration in which the insulating member and the buffer material are integrated, and both the internal configuration and the manufacturing process of the nonaqueous electrolyte secondary battery 1 are simplified.

次に、図6(a)は絶縁シート40の展開状態を示す平面図、図6(b)は巻回状態を模式的に示す側面図である。   Next, FIG. 6A is a plan view showing a developed state of the insulating sheet 40, and FIG. 6B is a side view schematically showing a wound state.

図6(a)に示すように、絶縁シート40は、その一端を一定長の糊代43として、糊代43を除く部分が中心線L3を軸とする線対称な形状を有する。したがって、図6(b)に示すように、絶縁シート40を、タブ41a及び41a´が長円筒形状の短軸側の表面に一致するように電極体本体30に巻回すると、糊代43は、タブ41a及び41a´の位置から巻回軸Sを挟んで相対する、長円筒形状の短軸側の他方の表面に重ね合わせられ、溶着又は接着される。   As shown in FIG. 6A, the insulating sheet 40 has a linearly symmetric shape with one end as a predetermined length of the margin 43 and a portion excluding the margin 43 around the center line L3. Therefore, as shown in FIG. 6B, when the insulating sheet 40 is wound around the electrode body 30 so that the tabs 41a and 41a ′ coincide with the surface on the short axis side of the long cylindrical shape, the adhesive margin 43 is Then, they are superposed and welded or bonded to the other surface on the short axis side of the long cylindrical shape facing each other across the winding axis S from the position of the tabs 41a and 41a ′.

これは以下の効果をもたらす。すなわち、巻回された絶縁シート40を固定するためには糊代43が必要となるが、糊代43とその下に位置するシート本体42との積層部分は、他の部分より厚みが大きくなるため、長円筒形状の長軸側の表面に糊代43がある場合、その厚み分、電極体11の容器本体10の幅方向(蓋部20の短手方向)に沿った向きの寸法を圧迫してしまう。   This has the following effects. That is, in order to fix the wound insulating sheet 40, the glue margin 43 is required, but the laminated portion of the glue margin 43 and the sheet body 42 positioned therebelow is thicker than the other parts. Therefore, when there is the glue margin 43 on the surface on the long axis side of the long cylindrical shape, the dimension of the electrode body 11 in the direction along the width direction of the container main body 10 (short direction of the lid portion 20) is compressed. Resulting in.

そこで、糊代43を短軸側の表面に位置させることで、積層部分の厚みを、容器本体10の奥行き方向(蓋部20の表面20aに直交する方向)に沿った向きに逃がすことができ、これにより電極体11の容器本体10の幅方向の寸法を確保し、電池容器における電極体11の収納効率を高めることができる。   Therefore, by positioning the adhesive margin 43 on the surface on the short axis side, the thickness of the laminated portion can be released in a direction along the depth direction of the container body 10 (direction perpendicular to the surface 20a of the lid portion 20). Thereby, the dimension of the width direction of the container main body 10 of the electrode body 11 is ensured, and the accommodation efficiency of the electrode body 11 in a battery container can be improved.

なお、絶縁シート40は、図7(a)の平面図に示すように、タブ41a及び41a´が絶縁シート40の一端に設けられる構成としてもよい。この場合、図7(b)の側面図に示すように、糊代43と絶縁シート40との積層部分がタブ41a及び41a´の位置、すなわち図3の対向面Rと一致することとなり、絶縁シート40において集電体12との対向面Rの厚みが大きくなる。これにより、電極体11の収納効率を高めつつ、更に電極体11の保護の効果を一層高めることができる。   The insulating sheet 40 may have a configuration in which tabs 41 a and 41 a ′ are provided at one end of the insulating sheet 40 as shown in the plan view of FIG. In this case, as shown in the side view of FIG. 7B, the laminated portion of the adhesive margin 43 and the insulating sheet 40 coincides with the positions of the tabs 41a and 41a ′, that is, the facing surface R of FIG. In the sheet 40, the thickness of the surface R facing the current collector 12 is increased. Thereby, the effect of protecting the electrode body 11 can be further enhanced while increasing the storage efficiency of the electrode body 11.

このとき、糊代43の幅は、タブ41a及び41a´の幅と同一であることが望ましいが、図6(a)のように、より短い幅であってもよい。又、糊代43にタブ41a及び41a´と同一形状のタブを設けるようにしてもよい。   At this time, the width of the glue margin 43 is preferably the same as the width of the tabs 41a and 41a ', but may be shorter as shown in FIG. Moreover, you may make it provide the tab of the same shape as the tabs 41a and 41a 'in the glue margin 43. FIG.

又、絶縁シート40は、図8(a)の平面図に示すように、タブ41a及び41a´を含む帯44の領域の厚みが、他の領域より大きくなった構成(例えば他の部分の厚みの1.5〜2倍)としてもよい。この場合、図7の構成例と同様、図8(b)の側面図に示すように、絶縁シートにおいて対向面Rの厚みが大きくなり、更に電極体11の保護の効果を一層高めることができる。又、糊代43は図6の構成例と同様、電極体11の長円筒形状の短軸側の他方の表面に位置するため、収納効率は確保されている。   Further, as shown in the plan view of FIG. 8A, the insulating sheet 40 has a configuration in which the thickness of the band 44 including the tabs 41a and 41a ′ is larger than the other areas (for example, the thickness of other parts). 1.5 to 2 times). In this case, as in the configuration example of FIG. 7, as shown in the side view of FIG. 8B, the thickness of the opposing surface R is increased in the insulating sheet, and the effect of protecting the electrode body 11 can be further enhanced. . Since the margin 43 is located on the other surface on the short axis side of the long cylindrical shape of the electrode body 11 as in the configuration example of FIG. 6, the storage efficiency is ensured.

さらに、絶縁シート40は、図9(a)の平面図に示すように、タブ41a及び41a´の間隔を広げ、その間の領域を折り込んだ構成としてもよい。図中においては、折り線45、46をそれぞれ山折り、谷折りとすることにより、図9(b)の側面図に示すように、タブ41a及び41a´を含む、図3の対向面Rを被覆する領域に、絶縁シート40の折り込まれた部分が蛇腹状に形成され、集電体12に向かって突き出している。   Furthermore, as shown in the plan view of FIG. 9A, the insulating sheet 40 may have a configuration in which the space between the tabs 41a and 41a ′ is widened and the region between them is folded. In the drawing, the folding lines 45 and 46 are formed into a mountain fold and a valley fold, respectively, so that the opposing surface R of FIG. 3 including the tabs 41a and 41a ′ is formed as shown in the side view of FIG. 9B. In the region to be covered, the folded portion of the insulating sheet 40 is formed in a bellows shape and protrudes toward the current collector 12.

これにより、上述した図6〜8の構成の効果に加えて、完成後の非水電解質二次電池1内における、電極体11に印加される外力に抗する緩衝材としての機能を更に向上させることができる。   Thereby, in addition to the effect of the structure of FIGS. 6-8 mentioned above, the function as a buffer material resisting the external force applied to the electrode body 11 in the nonaqueous electrolyte secondary battery 1 after completion is further improved. be able to.

なお、タブ41a及び41a´の間の折込みの回数は任意であってよい。又、図9(b)には、絶縁シート40本体の折曲げられた領域は、内側に空隙を有する断面が逆Vの字状の形状を有するものとして示したが、折曲げに寄り対向する面同士を密着させて、折曲げ部分がそのまま絶縁シート40の厚みとなる構成としてもよい。   In addition, the frequency | count of folding between tab 41a and 41a 'may be arbitrary. Further, in FIG. 9B, the folded region of the insulating sheet 40 main body is shown as having an inverted V-shaped cross section with a gap on the inside, but is opposed to the folding. The surfaces may be brought into close contact with each other, and the bent portion may have the thickness of the insulating sheet 40 as it is.

又、上記の説明においては、電極体11は、電極体本体30と、電極体11と独立して、その表面に巻回されるシート状の絶縁体としての絶縁シート40とから構成されるものとしたが、本発明の絶縁体は、電極体本体と一体化した構成であってもよい。   In the above description, the electrode body 11 is composed of the electrode body 30 and the insulating sheet 40 as a sheet-like insulator wound around the surface independently of the electrode body 11. However, the insulator of the present invention may have a configuration integrated with the electrode body.

図10は、電極体11として、電極体本体36単体で絶縁シート40を備えた構成と同様の絶縁、緩衝機能を備えるようにしたものである。   In FIG. 10, the electrode body 11 is provided with the same insulating and buffering function as the structure in which the electrode body main body 36 is provided with the insulating sheet 40 alone.

電極体本体36は、図10に示すように、図4の電極体本体30と同様、電極体本体36は、巻回軸Sに対し、最内周から外周に向かって積層された、シート状の正極部材31、セパレータ33、負極部材32及びセパレータ35の各部材を巻回し、巻回軸Sに対する断面形状が長円筒形状となるよう成型されている。   As shown in FIG. 10, the electrode body main body 36 is a sheet-like structure in which the electrode body main body 36 is laminated with respect to the winding shaft S from the innermost periphery toward the outer periphery, as shown in FIG. 4. The positive electrode member 31, the separator 33, the negative electrode member 32, and the separator 35 are wound so that the cross-sectional shape with respect to the winding axis S is a long cylindrical shape.

そして、電極体本体36の最外周に位置するセパレータ35は、正極部材31、セパレータ33及び負極部材32の被覆が完了した位置から、その終端35aが、電極体本体36の周囲にさらに一周巻回される。   The separator 35 located on the outermost periphery of the electrode body 36 is further wound once around the electrode body 36 from the position where the covering of the positive electrode member 31, the separator 33, and the negative electrode member 32 is completed. Is done.

セパレータ35の終端35aは、その幅が図4の絶縁シート40のシート本体42と同一幅となるよう広がり、更にタブ41a、41a´と同一形状のタブ35b、35b´を備える。   The end 35a of the separator 35 expands to have the same width as the sheet main body 42 of the insulating sheet 40 of FIG. 4, and further includes tabs 35b and 35b ′ having the same shape as the tabs 41a and 41a ′.

このように、セパレータ35の終端35aをシート本体42と同様の構成とすることにより、電極体本体36単体で、本発明の電極体の機能を実現することが可能となる。又、上述した図7〜図9の構成例を組み合わせて実施するようにしてもよい。   As described above, the terminal body 35a of the separator 35 has the same configuration as that of the sheet body 42, whereby the function of the electrode body of the present invention can be realized by the electrode body body 36 alone. Moreover, you may make it implement combining the structural example of FIGS. 7-9 mentioned above.

なお、終端35aは、セパレータ35の基材である多孔膜や不織布等をそのまま用いてもよいが、表面に絶縁性の樹脂等を塗工することが、絶縁性、強度を向上でき、より望ましい。更に、セパレータ35に変えて、セパレータ33を延伸して最外周に引回した構成としてもよい。   In addition, although the termination | terminus 35a may use the porous film, the nonwoven fabric, etc. which are the base materials of the separator 35 as it is, it is more desirable to apply insulation resin etc. to the surface, and can improve insulation and intensity | strength. . Further, instead of the separator 35, the separator 33 may be extended and drawn to the outermost periphery.

又、本実施の形態の非水電解質二次電池1は、図1及び図2に示すように、集電体12の腕部12cが、貫通孔12aから電極体11の側端に向かう方向に後退するよう湾曲した渡り部分12c1を有していることも特徴としている。   Moreover, as shown in FIG.1 and FIG.2, the nonaqueous electrolyte secondary battery 1 of this Embodiment has the arm part 12c of the electrical power collector 12 in the direction which goes to the side edge of the electrode body 11 from the through-hole 12a. It is also characterized by having a crossing portion 12c1 curved so as to recede.

上記特徴は、集電体12自体の強度を向上させる効果を有するが、これは本実施の形態の絶縁シート40の構成について、以下の理由を与えている。すなわち、図13の従来例の集電体112のように、基台部112bから直交して腕部112cを形成されている構成においては、電極活物質が塗工された中央部分に比べて厚みの小さい集電箔としての正極111a(負極111a´)にのみ集電体が当たり、中央部分と干渉する可能性は低い。 Although the said characteristic has the effect of improving the intensity | strength of collector 12 itself, this has given the following reasons about the structure of the insulating sheet 40 of this Embodiment. That is, unlike the conventional examples of the current collector 112 in FIG. 13, in a configuration that is formed to the arm portion 112c orthogonally from the base portion 112b, as compared to the central portion where the electrode active material is coated thickness The current collector hits only the positive electrode 111a (negative electrode 111a ′) as a small current collector foil, and the possibility of interference with the central portion is low.

これに対し、本実施の形態においては、図1及び図2に示すように、渡り部分12c1が湾曲していることで、集電体の基台部12bが互いに近接し、従来例に比して、より集電体11の中央寄りに入り込んでいる。   On the other hand, in the present embodiment, as shown in FIGS. 1 and 2, since the crossing portion 12c1 is curved, the base portions 12b of the current collector are close to each other, compared to the conventional example. Thus, the current collector 11 is closer to the center.

この構造を採用すると、渡り部分12c1が電極体11の、正極又は負極よりも相対的な厚みが大きい中央部分に当たる可能性が高くなる。   When this structure is adopted, there is a high possibility that the transition portion 12c1 hits the central portion of the electrode body 11 having a relative thickness larger than that of the positive electrode or the negative electrode.

そこで、本実施の形態においては、渡り部分12c1が電極体11の当該厚みの大きい中央部分に干渉することを防ぐため、絶縁シート40は、タブ41a及び41a´が渡り部分12c1と電極体11の間に入り込んだ構成を備えている。   Therefore, in the present embodiment, in order to prevent the crossover portion 12c1 from interfering with the thick central portion of the electrode body 11, the tabs 41a and 41a ′ of the insulating sheet 40 are connected to the crossover portion 12c1 and the electrode body 11. It has an interstitial structure.

又、渡り部分12c1は、その縁面において角が存在しないため、例えば非水電解質二次電池1の組み立ての際に電極体11と集電体12とがたとえ接触したとしても、その影響を最小限に留めることができる。なお、渡り部分12c1は、その全体が湾曲しているものとして示したが、少なくとも内側の縁面12dが湾曲していればよく、外側の縁面は屈曲した構成であるとしてもよい。   In addition, since the transition portion 12c1 has no corners at the edge thereof, even if the electrode body 11 and the current collector 12 are in contact with each other, for example, when the nonaqueous electrolyte secondary battery 1 is assembled, the influence is minimized. Can be limited. Although the transition portion 12c1 is shown as being entirely curved, it is sufficient that at least the inner edge surface 12d is curved, and the outer edge surface may be bent.

以上のように、本発明の実施の形態の非水電解質二次電池1によれば、集電体12との対向面全体を被覆する絶縁シート40等を有する構成としたことにより、電極体と集電体との干渉に起因する不具合を未然に防止、又はその発生の可能性を低減することが可能となる。   As described above, according to the nonaqueous electrolyte secondary battery 1 according to the embodiment of the present invention, the structure including the insulating sheet 40 that covers the entire surface facing the current collector 12, etc. It is possible to prevent problems caused by interference with the current collector or reduce the possibility of occurrence thereof.

しかしながら、本発明は、上記の実施の形態に限定されるものではない。   However, the present invention is not limited to the above embodiment.

上記の説明においては、集電体12は、一対の腕部12cを有するものとして説明を行ったが、基台部に少なくとも一本以上の腕部が設けられた構成であればよく、本発明の集電体は、腕部の本数や形状により限定されるものではない。   In the above description, the current collector 12 has been described as having a pair of arm portions 12c. However, any configuration may be used as long as at least one arm portion is provided on the base portion. The current collector is not limited by the number or shape of the arm portions.

又、上記の説明においては、集電体12の腕部12の渡り部分12c3と直線部分12c4との境界L2は屈曲したものとしたが、湾曲した態様であってもよい。   In the above description, the boundary L2 between the transition portion 12c3 and the linear portion 12c4 of the arm portion 12 of the current collector 12 is bent, but may be curved.

又、上記の説明においては、凹部21xは、蓋部20の表面20aに形成された凸部21の形成に伴い生ずる凹みであるとしたが、凹部の形成は、以下の効果を奏する。すなわち、集電体12は凹部21x内にかしめ固定されて、かしめ端23e及び絶縁封止材13は凹部21x寄りにシフトして、容器本体10からは離れた箇所に位置している。更に、集電体12は、基台部12bが凹部21x内に位置しており、電極端子23と集電体12とを接続するための構成部材のうち、容器本体10内に位置するのは腕部12のみとなっている。   Further, in the above description, the recess 21x is a recess that is caused by the formation of the projection 21 formed on the surface 20a of the lid portion 20. However, the formation of the recess has the following effects. That is, the current collector 12 is caulked and fixed in the recess 21 x, and the caulking end 23 e and the insulating sealing material 13 are shifted toward the recess 21 x and are located away from the container body 10. Furthermore, the current collector 12 has the base 12b located in the recess 21x, and among the components for connecting the electrode terminal 23 and the current collector 12, the current collector 12 is located in the container body 10. Only the arm 12 is provided.

これにより、容器本体10の内部の殆どを電極体11によって占めることができ、同一容積の容器本体10を用いた電池容器に比して、より背の高い、体積の大きな電極体を用いた大容量の非水電解質二次電池を構成することが可能となる。   Thereby, most of the inside of the container main body 10 can be occupied by the electrode body 11, and compared with the battery container using the container main body 10 of the same volume, a large and large electrode body using a large volume electrode body is used. A nonaqueous electrolyte secondary battery having a capacity can be configured.

なお、本発明の凹部は、凸部の形成によらず構成されていてもよい。具体的には表面20aは平面を保ち、裏面にプレス又は切削等の加工により凹部21xを形成する。この場合、上記の効果に加えて、凹部21x以外の部分に関し、凹部21xに対して相対的に大きな厚みが確保され、凸部の寸法分だけ電池容器の寸法を小さく抑えることができる。特に予め蓋部の厚みを予め大きくとった場合に有効である。   In addition, the recessed part of this invention may be comprised irrespective of formation of a convex part. Specifically, the front surface 20a is kept flat, and the concave portion 21x is formed on the back surface by processing such as pressing or cutting. In this case, in addition to the above-described effects, a relatively large thickness is ensured with respect to the recesses 21x with respect to portions other than the recesses 21x, and the dimensions of the battery container can be kept small by the size of the protrusions. This is particularly effective when the thickness of the lid is previously increased.

又、上記の説明においては、本発明の電極体は巻回型であるとしたが、積層型の電極体としてもよい。   In the above description, the electrode body of the present invention is a wound type, but may be a laminated type electrode body.

又、上記の説明においては、本発明の蓄電素子は、リチウムイオン二次電池に代表される非水電解質二次電池1であるとしたが、電気化学反応により充放電可能な電池であれば、ニッケル水素電池その他各種の二次電池を用いてもよい。又、一次電池であってもよい。さらに電気二重層キャパシタのように、電気を直接電荷として蓄積する方式の素子であってもよい。要するに、本発明の蓄電素子は電気を蓄積可能な素子であれば、その具体的な方式によって限定されるものではない。   In the above description, the storage element of the present invention is a non-aqueous electrolyte secondary battery 1 typified by a lithium ion secondary battery. However, if the battery can be charged and discharged by an electrochemical reaction, Nickel metal hydride batteries and other various secondary batteries may be used. Moreover, a primary battery may be sufficient. Furthermore, it may be an element that directly stores electricity as electric charges, such as an electric double layer capacitor. In short, the power storage element of the present invention is not limited by its specific method as long as it can store electricity.

又、上記の説明においては、容器本体10及び蓋部20から構成される電池容器は、本発明の素子容器に相当するものであり、電極端子は蓋部に設けられるものとしたが、本発明は、電極端子を容器本体側に設けるものとしてもよい。要するに本発明は、素子容器の内壁の任意の部位に集電体が位置可能な構成であればよく、蓋部と容器本体との結合の態様によって限定されるものではない。   In the above description, the battery container composed of the container body 10 and the lid part 20 corresponds to the element container of the present invention, and the electrode terminal is provided on the lid part. The electrode terminal may be provided on the container body side. In short, the present invention may be any configuration as long as the current collector can be positioned at an arbitrary portion of the inner wall of the element container, and is not limited by the mode of coupling of the lid portion and the container body.

又、電池本体はアルミニウム製であるとしたが、アルミニウム合金、ステンレスその他任意の金属又は金属化合物を材料とするものであってもよい。   Further, although the battery body is made of aluminum, it may be made of an aluminum alloy, stainless steel or any other metal or metal compound.

又、上記の説明において、非水電解質二次電池1として例示した本発明の蓄電素子は、図11に示すように、図1に分解斜視図として示した各部を組み合わせた状態においては、正面と背面、及び右側面と左側面がそれぞれ対称であり、更に、図12(a)の平面図に示すように、蓋部20上に絶縁封止材22及び電極端子23の電極部23aが露出し、図12(b)の底面図に示すように、電池容器10の底面が平坦な、外形六面体の形状を有するものとした。   In the above description, the power storage device of the present invention exemplified as the non-aqueous electrolyte secondary battery 1 is, as shown in FIG. 11, in a state where the parts shown in the exploded perspective view in FIG. The back surface, the right side surface, and the left side surface are symmetrical, and the insulating sealing material 22 and the electrode portion 23a of the electrode terminal 23 are exposed on the lid portion 20 as shown in the plan view of FIG. As shown in the bottom view of FIG. 12B, the bottom surface of the battery case 10 has a flat hexahedral shape.

しかしながら、本発明の蓄電素子の形状は外形六面体の他、円筒形状、六面以上の多面体、球形等であってもよい。要するに、本発明の素子容器は、形状、材質その他の具体的な構成によって限定されるものではない。   However, the shape of the electricity storage device of the present invention may be a cylindrical shape, a polyhedron having six or more faces, a spherical shape, or the like in addition to the hexahedron. In short, the element container of the present invention is not limited by the shape, material, or other specific configuration.

なお、図11及び12(b)においては、例示として、一方の電極端子23の電極部23a上に、接続部材23bの端部輪郭23dが露出したものとしたが、端部輪郭23dは両方の電極部23a上に露出したものとしてもよいし、両方の電極部23aに露出しないものとしてもよい。   In FIGS. 11 and 12 (b), as an example, the end contour 23d of the connecting member 23b is exposed on the electrode portion 23a of one electrode terminal 23. It may be exposed on the electrode part 23a, or may not be exposed on both electrode parts 23a.

要するに、本発明は、その要旨を逸脱しない範囲内であれば、以上説明したものを含め、上記実施の形態に種々の変更を加えたものとして実施してもよい。   In short, the present invention may be implemented by adding various modifications to the above-described embodiment, including those described above, as long as they do not depart from the spirit of the present invention.

以上のような本発明は、蓄電素子において電極体と集電体との干渉を低減することが可能になる効果を有し、例えば二次電池のような蓄電素子等において有用である。   The present invention as described above has an effect of reducing the interference between the electrode body and the current collector in the power storage element, and is useful in a power storage element such as a secondary battery.

1 非水電解質二次電池
10 容器本体
11 電極体
11a 正極
12 集電体
12a 貫通孔
12b 基台部
12b1 板部
12b2 壁部
12c 腕部
12c1 渡り部分
12c2 直線部分
12c3 渡り部分
12c4 直線部分
13 絶縁封止材
14 挟持板
20 蓋部
20a 貫通孔
20b 枠部
20c 裏面
21 絶縁封止材
21a 貫通孔
21b 平面
21c 壁面
21d 壁面
21d 貫通孔
21x 凹部
22 絶縁封止材
22a 側壁
22b 主面
22c 筒部
22e 枠体
22f 端面
23 電極端子
23a 電極部
23b 接続部材
23c かしめ端
30 電極体本体
31 正極部材
32 負極部材
33、34 セパレータ
35 セパレータ
36 電極体本体
40 絶縁シート
41a、41a´ タブ
42 シート本体
43 糊代
DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 10 Container body 11 Electrode body 11a Positive electrode 12 Current collector 12a Through-hole 12b Base part 12b1 Plate part 12b2 Wall part 12c Arm part 12c1 Transition part 12c2 Straight line part 12c3 Transition part 12c4 Insulation seal 13 Stop material 14 Clamping plate 20 Lid portion 20a Through hole 20b Frame portion 20c Back surface 21 Insulating sealing material 21a Through hole 21b Flat surface 21c Wall surface 21d Wall surface 21d Through hole 21x Recessed portion 22 Insulating sealing material 22a Side wall 22b Main surface 22c Frame portion 22e Frame Body 22f End face 23 Electrode terminal 23a Electrode portion 23b Connection member 23c Caulking end 30 Electrode body 31 Positive electrode member 32 Negative electrode member 33, 34 Separator 35 Separator 36 Electrode body 40 Insulating sheet 41a, 41a ′ Tab 42 Sheet body 43 Adhesive

Claims (11)

素子容器と、
前記素子容器に設けられた電極端子と、
前記素子容器内に収容れる電極体と、
前記素子容器内に収容され、前記電極端子及び前記電極体に接続される集電体とを備え、
前記集電体は、
前記電極体から離隔して前記電極端子と接続される基台部と、
前記基台部から遠ざかるように湾曲又は屈曲する渡り部分と、前記渡り部分から延伸して前記電極体と接続される直線部分を含む、少なくとも一本の腕部とを有し、
前記電極体は、
両端にて前記腕部と接続される電極体本体と、
前記電極体本体の表面を覆う絶縁シートであって、前記集電体の前記基台部との対向面及び前記集電体の前記腕部の前記渡り部分との対向面を少なくとも覆う絶縁シートとを有する、
蓄電素子。
An element container;
An electrode terminal provided in the element container;
An electrode body housed in the element container ;
A current collector housed in the element container and connected to the electrode terminal and the electrode body ;
The current collector is
A base that is spaced apart from the electrode body and connected to the electrode terminal;
A transferring portion which is curved or bent away from the base portion, extending from the crossover portion including a straight portion connected to the electrode body, and at least one of the arms,
The electrode body is
An electrode body main body connected to the arm at both ends;
An insulating sheet covering the surface of the electrode body, the insulating sheet covering at least a surface facing the base portion of the current collector and a surface facing the bridging portion of the arm portion of the current collector; Having
Power storage element.
前記絶縁シートの、前記集電体の前記基台部との対向面及び前記集電体の前記渡り部分との対向面を覆う部分は、前記電極体本体の前記両端まで達している、
請求項1に記載の蓄電素子。
The portion of the insulating sheet that covers the surface facing the base portion of the current collector and the surface facing the crossing portion of the current collector reaches the both ends of the electrode body.
The electricity storage device according to claim 1.
前記電極体本体は、
正極部材及び負極部材が、セパレータを介して巻回されてなる巻回体の構成を有し、
前記絶縁シートは、
前記巻回体の最外周に、前記巻回体とは独立して巻回されている、
請求項1又は2に記載の蓄電素子。
The electrode body is
The positive electrode member and the negative electrode member have a configuration of a wound body that is wound through a separator,
The insulating sheet is
The outermost periphery of the wound body is wound independently of the wound body,
The electrical storage element of Claim 1 or 2.
前記電極体本体は、
正極部材及び負極部材が、セパレータを介して巻回されてなる巻回体の構成を有し、
前記絶縁シートは、
前記電極体本体の前記巻回体の最外周に巻回された前記セパレータである、
請求項1又は2に記載の蓄電素子。
The electrode body is
The positive electrode member and the negative electrode member have a configuration of a wound body that is wound through a separator,
The insulating sheet is
The separator wound around the outermost periphery of the wound body of the electrode body.
The electrical storage element of Claim 1 or 2.
前記絶縁シートは、その巻回軸方向における幅が、
前記集電体の前記基台部との対向面及び前記集電体の前記渡り部分との対向面に対応する部分にて最も大きい、
請求項3又は4に記載の蓄電素子。
The insulating sheet has a width in the winding axis direction,
The largest in the portion corresponding to the surface facing the base portion of the current collector and the surface facing the crossover portion of the current collector,
The electrical storage element of Claim 3 or 4.
前記絶縁シートは、前記電極体本体に少なくとも一周以上巻回されており、
前記絶縁シートの、前記電極体の表面に露出する一端は、巻回軸を間に挟んで前記集電体と前記電極端子との接続箇所に対向している、
請求項1から5のいずれかに記載の蓄電素子。
The insulating sheet is wound around the electrode body at least one turn,
One end of the insulating sheet exposed on the surface of the electrode body is opposed to a connection portion between the current collector and the electrode terminal with a winding shaft in between.
The electrical storage element in any one of Claim 1 to 5.
前記絶縁シートは、前記電極体本体に少なくとも一周以上巻回されており、
前記絶縁シートの、前記電極体の表面に露出する一端は、前記集電体と前記電極端子との接続箇所に直接対向している、
請求項1から5のいずれかに記載の蓄電素子。
The insulating sheet is wound around the electrode body at least one turn,
One end of the insulating sheet exposed on the surface of the electrode body is directly opposed to a connection portion between the current collector and the electrode terminal.
The electrical storage element in any one of Claim 1 to 5.
前記絶縁シートは、前記集電体と前記電極端子との接続箇所に対向する部分の厚みが、他の部分の厚みより大きい、
請求項1から7のいずれかに記載の蓄電素子。
The insulating sheet has a thickness that is greater than the thickness of the other portion, the thickness of the portion facing the connection location between the current collector and the electrode terminal,
The electrical storage element in any one of Claim 1 to 7.
前記絶縁シートは、
前記集電体と前記電極端子との接続箇所に対向する部分が、前記電極体本体の表面上にて蛇腹状に折り畳まれている、
請求項1から8のいずれかに記載の蓄電素子。
The insulating sheet is
The portion facing the connecting portion between the current collector and the electrode terminal is folded in a bellows shape on the surface of the electrode body,
The electrical storage element in any one of Claim 1 to 8.
前記集電体の前記腕部は、湾曲した縁面を有する、
請求項1から9のいずれかに記載の蓄電素子。
The arm portion of the current collector has a curved edge surface;
The electrical storage element in any one of Claim 1 to 9.
前記素子容器の内壁には凹部が設けられており、
前記集電体の前記基台部は、前記凹部内に位置している、
請求項1から10のいずれかに記載の蓄電素子。
The inner wall of the element container is provided with a recess,
The base of the current collector is located in the recess,
The electrical storage element in any one of Claim 1 to 10.
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