JP5516240B2 - Bipolar secondary battery - Google Patents

Bipolar secondary battery Download PDF

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JP5516240B2
JP5516240B2 JP2010191939A JP2010191939A JP5516240B2 JP 5516240 B2 JP5516240 B2 JP 5516240B2 JP 2010191939 A JP2010191939 A JP 2010191939A JP 2010191939 A JP2010191939 A JP 2010191939A JP 5516240 B2 JP5516240 B2 JP 5516240B2
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current collector
power generation
secondary battery
collector plate
bipolar
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JP2012049067A (en
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裕介 佐々木
靖和 岩崎
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Nissan Motor Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H01M10/0418—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes with bipolar electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H01M10/044—Small-sized flat cells or batteries for portable equipment with bipolar electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/029—Bipolar electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Description

本発明は双極型二次電池に関するものである。   The present invention relates to a bipolar secondary battery.

従来、正極層と、固体電解質膜と、負極層とを積層した発電ユニットを複数積層し、発電ユニットの間にバイポーラ（双極）層を配置し、発電ユニットの最外層には集電体（電極タブ）を設け、これらを電池ケースに収納した双極型二次電池が、特許文献１に開示されている。   Conventionally, a plurality of power generation units each including a positive electrode layer, a solid electrolyte membrane, and a negative electrode layer are stacked, a bipolar layer is disposed between the power generation units, and a current collector (electrode) is disposed on the outermost layer of the power generation unit. A bipolar secondary battery in which a tab is provided and accommodated in a battery case is disclosed in Patent Document 1.

特開２００９−２５２５４８号公報JP 2009-252548 A

しかし、上記の発明では、導電体が電池ケースなどを貫通し、内部短絡が生じた場合に、導電体と電極タブとが接触し、電極タブを介して短絡電流が流れ続けて、電池の性能が低下するといった問題点がある。   However, in the above invention, when the conductor penetrates the battery case or the like and an internal short circuit occurs, the conductor and the electrode tab are in contact with each other, and the short circuit current continues to flow through the electrode tab. There is a problem such as lowering.

本発明はこのような問題点を解決するために発明されたもので、導電体が電池ケースなどを貫通した場合に、電極タブを介して電池に短絡電流が流れることを抑制することを目的とする。   The present invention was invented to solve such problems, and it is intended to suppress a short-circuit current from flowing to a battery via an electrode tab when a conductor penetrates a battery case or the like. To do.

本発明のある態様に係る双極型二次電池は、双極型電極を有する双極型二次電池であって、電解質層を介して双極型電極を積層した単位発電要素を積層した発電要素と、単位発電要素の積層方向において発電要素の両端に配置され、発電要素に当接する集電板と、集電板の面内方向に張力を掛けた状態で集電板を保持する張力保持手段とを備える。   A bipolar secondary battery according to an aspect of the present invention is a bipolar secondary battery having a bipolar electrode, in which a power generation element in which unit power generation elements in which bipolar electrodes are stacked via an electrolyte layer are stacked, and a unit A current collecting plate disposed at both ends of the power generating element in the stacking direction of the power generating elements, and a tension holding means for holding the current collecting plate in a state where tension is applied in the in-plane direction of the current collecting plate .

本発明によると、導電体が集電板を貫通し、発電要素に刺さった場合に、導電体から集電板を介して短絡電流が流れることを抑制することができる。   ADVANTAGE OF THE INVENTION According to this invention, when a conductor penetrates a current collection board and stabs in a power generation element, it can suppress that a short circuit current flows through a current collection board from a conductor.

本発明の第１実施形態における双極型リチウム二次電池の構成を示す断面図である。It is sectional drawing which shows the structure of the bipolar lithium secondary battery in 1st Embodiment of this invention. 第１実施形態において導電体が発電要素に刺さった状態を説明する図である。It is a figure explaining the state which the electric conductor stabbed in the electric power generation element in 1st Embodiment. 第２実施形態において導電体が発電要素に刺さった状態を説明する図である。It is a figure explaining the state which the electric conductor stabbed in the electric power generation element in 2nd Embodiment. 第３実施形態における双極型リチウム二次電池の平面図である。It is a top view of the bipolar lithium secondary battery in 3rd Embodiment. 第３実施形態における双極型リチウム二次電池の側面図である。It is a side view of the bipolar lithium secondary battery in 3rd Embodiment. 図４におけるVI-VI断面図である。It is VI-VI sectional drawing in FIG. 第３実施形態において導電体が発電要素に刺さった状態を説明する図である。It is a figure explaining the state which the electric conductor stabbed in the electric power generation element in 3rd Embodiment.

本発明の第１実施形態の構成について図１を用いて説明する。図１は本実施形態の双極型二次電池の断面図である。ここでは双極型二次電池として、双極型リチウムイオン二次電池を用いて説明するが、これに限られることはない。   The configuration of the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of the bipolar secondary battery of this embodiment. Here, a bipolar lithium ion secondary battery will be described as a bipolar secondary battery, but the present invention is not limited to this.

双極型リチウム二次電池１００は、発電要素１と、集電板２と、張力保持機構（張力保持手段）３とを備える。   The bipolar lithium secondary battery 100 includes a power generation element 1, a current collector plate 2, and a tension holding mechanism (tension holding means) 3.

発電要素１は、単位発電要素６を複数積層して形成される。単位発電要素６は、双極型電極７と、電解質層８とを交互に複数積層して形成される。   The power generation element 1 is formed by stacking a plurality of unit power generation elements 6. The unit power generation element 6 is formed by alternately laminating a plurality of bipolar electrodes 7 and electrolyte layers 8.

双極型電極７は、集電箔９と、集電箔９の一方の面に形成された正極活物質層１０と、集電箔９の他方の面に形成された負極活物質層１１とを備える。   The bipolar electrode 7 includes a current collector foil 9, a positive electrode active material layer 10 formed on one surface of the current collector foil 9, and a negative electrode active material layer 11 formed on the other surface of the current collector foil 9. Prepare.

電解質層８を介して隣り合う双極型電極７は、一方の双極型電極７の正極活物質層１０が電解質層８の一方の面に当接し、もう一方の双極型電極７の負極活物質層１１が電解質層８のもう一方の面に当接している。   The bipolar electrode 7 adjacent via the electrolyte layer 8 has a positive electrode active material layer 10 of one bipolar electrode 7 in contact with one surface of the electrolyte layer 8 and a negative electrode active material layer of the other bipolar electrode 7. 11 is in contact with the other surface of the electrolyte layer 8.

集電箔９は、例えばアルミニウム、ステンレスなどの導電性部材である。また、集電箔９は、例えばポリオレフィンなどの高分子材料にカーボンなどの導電性物質を混ぜたものを使用しても良い。集電箔９は、正極活物質層１０および負極活物質層１１よりも大きく、集電箔９の間にはシール部１３が設けられる。   The current collector foil 9 is a conductive member such as aluminum or stainless steel. The current collector foil 9 may be made of a polymer material such as polyolefin mixed with a conductive substance such as carbon. The current collector foil 9 is larger than the positive electrode active material layer 10 and the negative electrode active material layer 11, and a seal portion 13 is provided between the current collector foils 9.

正極活物質層１０は、例えばリチウム−遷移金属複合酸化物である。負極活物質層１１は、例えばカーボン−遷移金属複合酸化物である。   The positive electrode active material layer 10 is, for example, a lithium-transition metal composite oxide. The negative electrode active material layer 11 is, for example, a carbon-transition metal composite oxide.

電解質層８は、例えばポリエチレンオキシド（ＰＥＯ）などのイオン伝導性を有する固体電解質である。   The electrolyte layer 8 is a solid electrolyte having ion conductivity such as polyethylene oxide (PEO).

正極活物質層１０、電解質層８、負極活物質層１１の積層方向両端面に集電箔９を含めることで単電池１２が形成される。図１に示す発電要素１では、２個の単位発電要素６にそれぞれ３個の単電池１２が設けられているが、これらに限定されるものではない。   The unit cell 12 is formed by including the current collector foil 9 on both end surfaces of the positive electrode active material layer 10, the electrolyte layer 8, and the negative electrode active material layer 11 in the stacking direction. In the power generation element 1 shown in FIG. 1, three unit cells 12 are provided in each of the two unit power generation elements 6, but the present invention is not limited to these.

集電板２は、弾性膜（弾性手段）１６と、強電タブ（導電性部材）１７とを備える。集電板２は、発電要素１の正極側および負極側にそれぞれ設けられている。   The current collector plate 2 includes an elastic film (elastic means) 16 and a high voltage tab (conductive member) 17. The current collector plate 2 is provided on each of the positive electrode side and the negative electrode side of the power generation element 1.

弾性膜１６は、例えばシリコンゴムであるが、これの他にヤング率が０．００１〜０．１ＧＰａの弾性体であればよい。   The elastic film 16 is, for example, silicon rubber, but may be any elastic body having a Young's modulus of 0.001 to 0.1 GPa.

強電タブ１７は、例えばアルミニウム箔（厚さ２０μｍ）などの導電性部材である。強電タブ１７の一部は、発電要素１の最外層の集電箔９に当接する。また、強電タブ１７の一部が、外部負荷（例えば、モータ）、発電機などと電気的に接続することで、双極型リチウム二次電池１００は充放電を行う。   The high voltage tab 17 is a conductive member such as an aluminum foil (thickness 20 μm), for example. A portion of the high-power tab 17 abuts on the outermost current collecting foil 9 of the power generation element 1. In addition, the bipolar lithium secondary battery 100 is charged and discharged by electrically connecting a part of the high voltage tab 17 to an external load (for example, a motor), a generator, or the like.

集電板２は、弾性膜１６を例えば３．６ＭＰａの引張強さで伸ばし、伸ばした弾性膜１６と強電タブ１７とを接着剤によって接着して構成される。   The current collector plate 2 is configured by stretching the elastic film 16 with a tensile strength of, for example, 3.6 MPa, and bonding the stretched elastic film 16 and the high voltage tab 17 with an adhesive.

張力保持機構３は、弾性膜１６の両端に設けた連結部材１８と、発電要素１を挟んで向かい合う、正極側の連結部材１８と負極側の連結部材１８とを連結する固定用ボルト１９とを備える。   The tension holding mechanism 3 includes connecting members 18 provided at both ends of the elastic film 16 and fixing bolts 19 that connect the positive electrode side connecting member 18 and the negative electrode side connecting member 18 facing each other with the power generation element 1 interposed therebetween. Prepare.

張力保持機構３は、集電板２を伸ばした状態で正極側の連結部材１８と負極側の連結部材１８とを固定用ボルト１９によって連結する。これにより、集電板２は、面内方向に張力が生じた状態で保持される。なお、連結部材１８は絶縁性の部材で構成されている。   The tension holding mechanism 3 connects the positive-side connecting member 18 and the negative-side connecting member 18 with a fixing bolt 19 in a state where the current collector plate 2 is extended. Thereby, the current collector plate 2 is held in a state where tension is generated in the in-plane direction. The connecting member 18 is made of an insulating member.

次に本実施形態の作用について図２を用いて説明する。図２は、双極型リチウム二次電池１００に外部から導電体２０が発電要素１に刺さった場合の断面図である。   Next, the operation of this embodiment will be described with reference to FIG. FIG. 2 is a cross-sectional view of the bipolar lithium secondary battery 100 when the conductor 20 is stuck into the power generation element 1 from the outside.

本実施形態を用いない双極型リチウム二次電池において、外部から導電体が発電要素に刺さると導電体と集電板とが接触し、集電板を介して内部短絡が生じる。内部短絡が生じた箇所では、例えば発熱が生じ易く、電池性能が低下する。   In a bipolar lithium secondary battery that does not use this embodiment, when a conductor is stuck into the power generation element from the outside, the conductor and the current collector plate contact each other, and an internal short circuit occurs via the current collector plate. In the place where the internal short circuit occurs, for example, heat is likely to be generated, and the battery performance is deteriorated.

本実施形態では、双極型リチウム二次電池１００に外部から導電体２０が発電要素１に刺さった場合には、導電体２０が刺さった箇所から集電板２が開裂変形する。本実施形態では、集電板２は、弾性膜１６と強電タブ１７との張力差によって、面直方向に開裂する。さらに弾性膜１６が復元力によって固定用ボルト１９側に収縮するので、集電板２は固定用ボルト１９側に収縮する。これによって集電板２の強電タブ１７は導電体２０と接触しなくなる。そのため、導電体２０と集電板２との導通が抑制され、短絡電流が抑制される。   In the present embodiment, when the conductor 20 is stuck in the power generation element 1 from the outside in the bipolar lithium secondary battery 100, the current collector plate 2 is cleaved and deformed from the place where the conductor 20 is stuck. In the present embodiment, the current collector plate 2 is cleaved in the direction perpendicular to the surface due to the difference in tension between the elastic film 16 and the high voltage tab 17. Further, since the elastic film 16 contracts to the fixing bolt 19 side by the restoring force, the current collector plate 2 contracts to the fixing bolt 19 side. As a result, the high voltage tab 17 of the current collector plate 2 is not in contact with the conductor 20. Therefore, conduction between the conductor 20 and the current collector plate 2 is suppressed, and a short circuit current is suppressed.

本実施形態の効果について説明する。   The effect of this embodiment will be described.

外部から双極型リチウム二次電池１００に導電体２０が発電要素１に刺さった場合に、集電板２が開裂変形することで、導電体２０と集電板２の強電タブ１７とが接触しなくなり、電気的な接続が解除される。そのため、集電板２を介して短絡電流が流れることを抑制することができ、短絡電流が流れることで生じる双極型リチウム二次電池１００の電池機能の劣化を抑制することができる。   When the conductor 20 is stuck in the power generating element 1 from the outside to the bipolar lithium secondary battery 100, the current collector plate 2 is cleaved and deformed, so that the conductor 20 and the high current tab 17 of the current collector plate 2 come into contact with each other. Disappears and the electrical connection is released. Therefore, it is possible to suppress the short circuit current from flowing through the current collector plate 2, and it is possible to suppress the deterioration of the battery function of the bipolar lithium secondary battery 100 caused by the short circuit current flowing.

集電板２は集電板２の面内方向に張力が掛かるように保持されており、導電体２０が発電要素１に刺さった時に集電板２は素早く開裂変形する。そのため、短絡電流が集電板２を介して流れる前に、集電板２と導電体２０との電気的な接続を解除することができ、双極型リチウム二次電池１００の電池機能が劣化することを抑制することができる。   The current collector plate 2 is held so as to be tensioned in the in-plane direction of the current collector plate 2, and when the conductor 20 is stuck in the power generation element 1, the current collector plate 2 is quickly split and deformed. Therefore, before the short-circuit current flows through the current collector plate 2, the electrical connection between the current collector plate 2 and the conductor 20 can be released, and the battery function of the bipolar lithium secondary battery 100 is deteriorated. This can be suppressed.

強電タブ１７に弾性膜１６を接着して集電板２を構成するので、導電体２０が発電要素１に刺さっていない場合には十分な導電性を保つことができる。一方、導電体２０が発電要素１に刺さった場合には集電板２と導電体２０との電気的な接続を解除し、双極型リチウム二次電池１００の電池機能が劣化することを抑制することができる。   Since the current collector plate 2 is configured by adhering the elastic film 16 to the high-power tab 17, sufficient conductivity can be maintained when the conductor 20 is not stuck in the power generation element 1. On the other hand, when the conductor 20 is stuck in the power generation element 1, the electrical connection between the current collector plate 2 and the conductor 20 is released, and deterioration of the battery function of the bipolar lithium secondary battery 100 is suppressed. be able to.

次に本発明の第２実施形態について用いて説明する。   Next, a second embodiment of the present invention will be described.

本実施形態は、集電板３０が異なっており、本実施形態の集電板３０は、導電材を弾性膜に埋め込んで構成される。図３に本実施形態の発電要素に導電体２０が刺さった状態を示す。図３に示すように、本実施形態では、集電板３０は面内方向に開裂変形する。   In the present embodiment, the current collector plate 30 is different, and the current collector plate 30 of the present embodiment is configured by embedding a conductive material in an elastic film. FIG. 3 shows a state where the conductor 20 is stuck in the power generation element of the present embodiment. As shown in FIG. 3, in the present embodiment, the current collector plate 30 is cleaved and deformed in the in-plane direction.

本実施形態の効果について説明する。   The effect of this embodiment will be described.

導電材を弾性膜に埋め込んで集電板３０を構成することで、第１実施形態と同様に導電体２０が発電要素に刺さった場合に、双極型リチウム二次電池１００の電池機能が劣化することを抑制することができる。   By configuring the current collecting plate 30 by embedding a conductive material in the elastic film, the battery function of the bipolar lithium secondary battery 100 is deteriorated when the conductor 20 is stuck in the power generation element as in the first embodiment. This can be suppressed.

なお、上記実施形態において、集電板を熱収縮性または熱硬化性部材を用いて構成してもよい。また、このような集電板と上記実施形態の集電板とを組み合わせてもよい。これらにより、双極型リチウム二次電池で発生した熱によって導電体と集電板との電気的な接続を解除することができる。   In the above embodiment, the current collector plate may be configured using a heat-shrinkable or thermosetting member. Moreover, you may combine such a current collection plate and the current collection plate of the said embodiment. As a result, the electrical connection between the conductor and the current collector plate can be released by the heat generated in the bipolar lithium secondary battery.

次に本発明の第３実施形態について図４〜図６を用いて説明する。図４は本実施形態の双極型リチウム二次電池の平面図である。図５は、本実施形態の双極型リチウム二次電池の側面図である。図６は、図４のVI-VI断面図である。   Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a plan view of the bipolar lithium secondary battery of this embodiment. FIG. 5 is a side view of the bipolar lithium secondary battery of the present embodiment. 6 is a cross-sectional view taken along the line VI-VI in FIG.

第３実施形態については第１実施形態と異なる部分を中心に説明する。本実施形態の双極型リチウム二次電池１０１は、集電板４１と張力保持機構４２とが第１実施形態と異なっている。   The third embodiment will be described with a focus on differences from the first embodiment. The bipolar lithium secondary battery 101 of the present embodiment is different from the first embodiment in the current collector plate 41 and the tension holding mechanism 42.

集電板４１は、例えばアルミニウムなどの導電性部材をバネ形状にすることで形成される。集電板４１は例えば厚さ１ｍｍ、幅２０ｍｍである。   The current collecting plate 41 is formed by making a conductive member such as aluminum into a spring shape, for example. The current collecting plate 41 has a thickness of 1 mm and a width of 20 mm, for example.

張力保持機構４２は、集電板４１の直線状に形成された端部４１ａに第１固定用ボルト４４を介して連結する第１固定部材４３と、発電要素１を挟んで向かい合う正極側の第１固定部材４３と負極側の第１固定部材４３とに第２固定用ボルト４６を介して連結する第２固定部材４５とを備える。   The tension holding mechanism 42 includes a first fixing member 43 that is connected to a linearly formed end portion 41 a of the current collector plate 41 via a first fixing bolt 44, and a positive electrode side first electrode that faces the power generation element 1. A second fixing member 45 connected to the first fixing member 43 and the first fixing member 43 on the negative electrode side via a second fixing bolt 46 is provided.

第１固定部材４３は、直線状の絶縁性部材であり、中央部付近で集電板４１の端部４１ａと第１固定用ボルト４４を介して連結する。第１固定部材４３は、正極側、負極側にそれぞれ一対設けられている。一対の第１固定部材４３には、集電板４１が例えば引張強さ０．１ＧＰａで張力をかけられた状態で第１固定用ボルト４４によって固定されている。   The first fixing member 43 is a linear insulating member and is connected to the end portion 41 a of the current collector plate 41 via the first fixing bolt 44 in the vicinity of the center portion. A pair of first fixing members 43 are provided on each of the positive electrode side and the negative electrode side. A current collecting plate 41 is fixed to the pair of first fixing members 43 by a first fixing bolt 44 in a state where a tension is applied with a tensile strength of 0.1 GPa, for example.

なお、図４〜６においては、集電板４１を説明のため、１本の細板を曲げたものを図示しているが、これに限られることはなく、集電箔との接触面積が大きく、集電板４１の面内方向に張力を生じさせるものであればよい。   In FIGS. 4 to 6, for the purpose of explaining the current collector plate 41, a bent one thin plate is illustrated. However, the present invention is not limited to this, and the contact area with the current collector foil is as follows. Any material that is large and that generates tension in the in-plane direction of the current collector plate 41 may be used.

正極側の集電板４１、負極側の集電板４１は同じ構成であり、本実施形態の双極型リチウム二次電池は、上記する集電板４１を正極側、負極側に備える。   The current collector plate 41 on the positive electrode side and the current collector plate 41 on the negative electrode side have the same configuration, and the bipolar lithium secondary battery of this embodiment includes the above-described current collector plate 41 on the positive electrode side and the negative electrode side.

第２固定部材４５は、絶縁性部材であり、図５に示すように発電要素１に対して同一側に位置する正極側の第１固定部材４３と、負極側の第１固定部材４３とに第２固定用ボルト４６を介して連結する。なお、第２固定部材４５は、図示しないケースなどに取り付けられている。   The second fixing member 45 is an insulating member. As shown in FIG. 5, the positive electrode side first fixing member 43 and the negative electrode side first fixing member 43 located on the same side with respect to the power generation element 1 are provided. The second fixing bolts 46 are connected. The second fixing member 45 is attached to a case (not shown).

次の本実施形態の作用について説明する。   The operation of the present embodiment will be described.

本実施形態では、外部から導電体２０が発電要素１に刺さると、集電板４１が切断され、集電板４１の復元力によって、図７に示すように第１固定部材４３に固定された端部４１ａ側へ、集電板４１は収縮する。これによって、導電体２０と集電板４１とは接触しなくなる。   In the present embodiment, when the conductor 20 is pierced into the power generation element 1 from the outside, the current collecting plate 41 is cut and fixed to the first fixing member 43 by the restoring force of the current collecting plate 41 as shown in FIG. The current collecting plate 41 contracts toward the end 41a side. As a result, the conductor 20 and the current collector plate 41 are not in contact with each other.

本実施形態の効果について説明する。   The effect of this embodiment will be described.

本実施形態では、集電板４１をバネ形状とするだけで、上記実施形態の効果に加えて、軽量化、体積減少およびコストを削減することができる。   In the present embodiment, simply by making the current collector plate 41 into a spring shape, in addition to the effects of the above-described embodiment, it is possible to reduce the weight, the volume, and the cost.

本発明は上記した実施形態に限定されるものではなく、その技術的思想の範囲内でなしうるさまざまな変更、改良が含まれることは言うまでもない。   It goes without saying that the present invention is not limited to the above-described embodiments, and includes various modifications and improvements that can be made within the scope of the technical idea.

１ 発電要素
２、４１ 集電板
３ 張力保持機構（張力保持手段）
６ 単位発電要素
７ 双極型電極
８ 電解質層
９ 集電箔
１６ 弾性膜（弾性手段）
１７ 強電タブ（導電性部材）
１８ 連結部材
１９ 固定用ボルト
２０ 導電体
４３ 第１固定部材
４４ 第１固定用ボルト
４５ 第２固定部材
４６ 第２固定用ボルト
１００、１０１ 双極型リチウム二次電池（双極型二次電池） DESCRIPTION OF SYMBOLS 1 Power generation element 2, 41 Current collecting plate 3 Tension holding mechanism (tension holding means)
6 Unit power generation element 7 Bipolar electrode 8 Electrolyte layer 9 Current collector foil 16 Elastic membrane (elastic means)
17 High-power tab (conductive member)
18 connecting member 19 fixing bolt 20 conductor 43 first fixing member 44 first fixing bolt 45 second fixing member 46 second fixing bolt 100, 101 bipolar lithium secondary battery (bipolar secondary battery)

Claims (4)

双極型電極を有する双極型二次電池であって、
電解質層を介して前記双極型電極を積層した単位発電要素を積層した発電要素と、
前記単位発電要素の積層方向において前記発電要素の両端に配置され、前記発電要素に当接する集電板と、
前記集電板の面内方向に張力を掛けた状態で前記集電板を保持する張力保持手段とを備えることを特徴とする双極型二次電池。 A bipolar secondary battery having a bipolar electrode,
A power generation element in which unit power generation elements in which the bipolar electrode is stacked through an electrolyte layer are stacked;
Current collector plates disposed at both ends of the power generation element in the stacking direction of the unit power generation elements, and abutting the power generation element
A bipolar secondary battery, comprising: tension holding means for holding the current collector plate in a state where tension is applied in an in-plane direction of the current collector plate. 前記集電板は、
前記発電要素に当接する導電性部材と、
前記導電性部材に接着する弾性手段とを備えることを特徴とする請求項１に記載の双極型二次電池。 The current collector plate is
A conductive member in contact with the power generation element;
The bipolar secondary battery according to claim 1, further comprising an elastic unit that adheres to the conductive member. 前記集電板は、導電材を埋め込んだ弾性手段であることを特徴とする請求項１に記載の双極型二次電池。   The bipolar secondary battery according to claim 1, wherein the current collector plate is an elastic means in which a conductive material is embedded. 前記集電板は、バネ形状に形成されることを特徴とする請求項１に記載の双極型二次電池。   The bipolar secondary battery according to claim 1, wherein the current collector plate is formed in a spring shape.
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