JP5810861B2 - battery - Google Patents

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JP5810861B2
JP5810861B2 JP2011251867A JP2011251867A JP5810861B2 JP 5810861 B2 JP5810861 B2 JP 5810861B2 JP 2011251867 A JP2011251867 A JP 2011251867A JP 2011251867 A JP2011251867 A JP 2011251867A JP 5810861 B2 JP5810861 B2 JP 5810861B2
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foil
electrode plate
power generation
generation element
positive electrode
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JP2013109858A (en
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太郎 山福
太郎 山福
佐々木　丈
丈 佐々木
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GS Yuasa International Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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、夫々活物質層を形成した箔状正極板と箔状負極板とをセパレータを挟んだ状態で積層した発電要素が備えられ、前記発電要素における設定方向の端部において、前記箔状正極板及び前記箔状負極板に前記活物質層を形成していない未形成部が配置され、前記箔状正極板の前記未形成部と前記箔状負極板の前記未形成部とは、前記設定方向で逆側に位置し、且つ、前記セパレータ及び対向する前記箔状負極板又は前記箔状正極板よりも前記設定方向で突出する状態で配置された電池に関する。   The present invention is provided with a power generation element in which a foil-like positive electrode plate and a foil-like negative electrode plate each having an active material layer formed thereon are stacked with a separator interposed therebetween, and at the end in the setting direction of the power generation element, the foil shape An unformed portion where the active material layer is not formed is disposed on the positive electrode plate and the foil-like negative electrode plate, and the unformed portion of the foil-like positive electrode plate and the unformed portion of the foil-like negative electrode plate are The present invention relates to a battery that is located on the opposite side in the setting direction and that is disposed in a state of projecting in the setting direction with respect to the separator and the foil-like negative electrode plate or the foil-like positive electrode plate facing each other.

かかる電池の発電要素は、夫々活物質層を形成した箔状正極板及び箔状負極板を、セパレータを挟んだ状態で積層して構成するもので、セパレータを両極板間に配置して、両極板間の電気的な絶縁とイオン等の移動を確保している。
このような構成の発電要素から電気配線を引き出すために、箔状正極板等に活物質層を形成しない未形成部を配置している。
このような形式で発電要素に対する電気配線を行うものとしては、下記特許文献１に記載のような、長尺帯状に形成した箔状正極板等を巻回して積層させた、いわゆる巻回型の発電要素が一般的に良く知られている。
巻回型の発電要素を有する電池では、箔状正極板及び箔状負極板の幅方向端部を、活物質を塗布しない未塗工部（上記未形成部に相当）として、その未塗工部を、正極と負極とで、幅方向の逆側に突出させて、正極及び負極の配線用の電極として取り出す構成とする場合が多い。 A power generation element of such a battery is formed by laminating a foil-like positive electrode plate and a foil-like negative electrode plate each having an active material layer sandwiched between separators. Electrical insulation between the plates and movement of ions, etc. are ensured.
In order to draw out the electrical wiring from the power generation element having such a configuration, an unformed portion where no active material layer is formed is disposed on the foil-like positive electrode plate or the like.
As what performs the electrical wiring with respect to an electric power generation element in such a format, as what is described in the following patent document 1, the foil-shaped positive electrode plate etc. which were formed in the elongate belt shape were wound and laminated | stacked, and what is called winding type Power generation elements are generally well known.
In a battery having a wound-type power generation element, the widthwise ends of the foil-like positive electrode plate and the foil-like negative electrode plate are used as uncoated portions (corresponding to the unformed portions) where no active material is applied. In many cases, the positive electrode and the negative electrode are protruded to the opposite side in the width direction and taken out as electrodes for the positive electrode and the negative electrode.

発電要素を上記のような構成とする場合、何らかの理由で発生した熱でセパレータが収縮し、箔状正極板の未塗工部と箔状負極板とが接触してしまうことが考えられる。
箔状正極板の未塗工部が接触する相手方の箔状負極板の活物質は、箔状正極板に塗布される活物質に比べて抵抗値が低く、箔状正極板の未塗工部と箔状負極板とが接触してしまうと、大きな電流が流れて発熱する。
このような箔状正極板の未塗工部と箔状負極板との接触を避ける手法としては、例えば、下記特許文献２に記載のように、箔状正極板の未塗工部に高抵抗の保護層を塗布することで、箔状負極板と接触した場合でも電流が極力流れないようにする手法も考えられる。 When the power generation element is configured as described above, it is considered that the separator contracts due to heat generated for some reason, and the uncoated portion of the foil-like positive electrode plate and the foil-like negative electrode plate come into contact with each other.
The active material of the other foil-shaped negative electrode plate with which the uncoated portion of the foil-shaped positive electrode plate comes into contact has a lower resistance than the active material applied to the foil-shaped positive electrode plate, and the uncoated portion of the foil-shaped positive electrode plate If the foil and the foil-like negative electrode plate come into contact with each other, a large current flows to generate heat.
As a technique for avoiding such contact between the uncoated portion of the foil-shaped positive electrode plate and the foil-shaped negative electrode plate, for example, as described in Patent Document 2, high resistance is applied to the uncoated portion of the foil-shaped positive electrode plate. A method of preventing current from flowing as much as possible even when contacting with the foil-like negative electrode plate by applying a protective layer is also conceivable.

特開２００９−１０５０７５号公報JP 2009-105075 A 特開２００７−９５６５６号公報JP 2007-95656 A

しかしながら、上述の箔状正極板の未塗工部に高抵抗の層を別途形成する手法では、それだけ製造工程が複雑化して、製造コストの上昇を招いてしまう不都合がある。
本発明は、かかる実情に鑑みてなされたものであって、その目的は、製造コストの上昇を抑制しながら、電池の発熱を抑制する点にある。 However, the method of separately forming a high-resistance layer on the uncoated portion of the foil-like positive electrode plate described above has a disadvantage that the manufacturing process becomes complicated and the manufacturing cost increases.
This invention is made | formed in view of this situation, The objective is to suppress the heat_generation | fever of a battery, suppressing the raise of manufacturing cost.

本出願の第１の発明は、夫々活物質層を形成した箔状正極板と箔状負極板とをセパレータを挟んだ状態で積層した発電要素が備えられ、前記発電要素における設定方向の端部において、前記箔状正極板及び前記箔状負極板に前記活物質層を形成していない未形成部が配置され、前記箔状正極板の前記未形成部と前記箔状負極板の前記未形成部とは、前記設定方向で逆側に位置し、且つ、前記セパレータ及び対向する前記箔状負極板又は前記箔状正極板よりも前記設定方向で突出する状態で配置された電池において、前記箔状正極板の前記未形成部側に位置する第１の端部から前記箔状負極板の前記未形成部側に位置する第２の端部に亘って配置されている前記セパレータにおいて、前記第１の端部が、前記第２の端部よりも強く押圧され、前記発電要素が過熱状態となったときに、前記セパレータが、前記箔状正極板の前記未形成部側よりも前記箔状負極板の前記未形成部側の端部が先行して縮む状態とする押圧手段が備えられている。 1st invention of this application is provided with the electric power generation element which laminated | stacked the foil-shaped positive electrode plate and foil-shaped negative electrode plate which each formed the active material layer in the state which pinched | interposed the separator, The edge part of the setting direction in the said power generation element The foil-shaped positive electrode plate and the foil-shaped negative electrode plate are provided with an unformed portion where the active material layer is not formed, and the foil-shaped positive electrode plate and the foil-shaped negative electrode plate are not formed. The battery is disposed on the opposite side in the setting direction and arranged in a state of protruding in the setting direction from the separator and the foil-like negative electrode plate or the foil-like positive electrode plate facing the separator. In the separator disposed from the first end located on the unformed part side of the electrode plate to the second end located on the unformed part side of the foil-like negative electrode plate, 1 end is strongly pressed is than the second end, before When the power generating element becomes overheated, the separator, the end portion of the unformed portion of the foil-like positive electrode plate the unformed portion the foil-like negative electrode plate than of a state shrinks prior A pressing means is provided.

すなわち、セパレータにおける、箔状正極板の上記未形成部側の端部（上記第１の端部）に対して、セパレータにおける、箔状負極板の上記未形成部側の端部（上記第２の端部）よりも強い押圧力を作用させることで、セパレータが熱によって縮もうとするときに、上記押圧力によってセパレータが押さえ込まれて、箔状正極板の上記未形成部側では縮みにくく、箔状負極板の上記未形成部側では縮み易くなる。
このため、箔状負極板の上記未形成部側で先行して短絡が発生する。
この短絡は、箔状正極板の活物質層形成領域と、箔状負極板の活物質層形成領域あるいは箔状負極板の上記未形成部との接触で発生するものであるため、箔状正極板に形成する活物質層は比較的に抵抗が高いことから、短絡故障によって流れる電流は、上記の正極側の上記未形成部での短絡故障ほどには大きくない。
従って、電池は、箔状負極板の上記未形成部側での短絡によって、過大な電流による発熱を伴うことなく、緩やかに故障していく。 That is, the end of the foil-shaped negative electrode plate on the non-formed part side (the second end) of the separator with respect to the end of the foil-shaped positive electrode plate on the non-formed part side (the first end). By applying a stronger pressing force than the end portion of the separator, the separator is pressed down by the pressing force when the separator is to be shrunk by heat, and is not easily shrunk on the unformed portion side of the foil-like positive electrode plate, On the unformed part side of the foil-shaped negative electrode plate, it becomes easy to shrink.
For this reason, a short circuit occurs in advance on the unformed part side of the foil-like negative electrode plate.
This short circuit is caused by contact between the active material layer forming region of the foil-like positive electrode plate and the active material layer forming region of the foil-like negative electrode plate or the above-mentioned unformed portion of the foil-like negative electrode plate. Since the active material layer formed on the plate has a relatively high resistance, the current flowing due to the short-circuit failure is not as great as the short-circuit failure in the unformed part on the positive electrode side.
Accordingly, the battery gradually fails without heat generation due to excessive current due to a short circuit on the unformed portion side of the foil-shaped negative electrode plate.

又、本出願の第２の発明は、上記第１の発明の構成に加えて、前記押圧手段は、前記発電要素を収納する電池筐体の内部空間において、前記セパレータにおける前記第１の端部に対する収納幅を、前記第２の端部に対する収納幅よりも幅狭に設定することによって構成されている。
すなわち、セパレータにおける、箔状正極板の上記未形成部側の端部（上記第１の端部）に対して、箔状負極板の上記未形成部側の端部（上記第２の端部）よりも強い押圧力を作用させるように、電池筐体の形状を設定している。 According to a second invention of the present application, in addition to the configuration of the first invention, the pressing means includes a first end portion of the separator in an internal space of the battery housing that houses the power generation element. Is set to be narrower than the storage width with respect to the second end portion.
That is, the end of the foil-shaped negative electrode plate on the non-formed part side (the second end part) with respect to the end of the foil-shaped positive electrode plate on the non-formed part side (the first end). The shape of the battery housing is set so that a stronger pressing force is applied.

又、本出願の第３の発明は、上記第１の発明の構成に加えて、前記押圧手段は、前記発電要素を収納する電池筐体の内壁と前記発電要素との間に配置されて、前記発電要素を押圧する押圧部材にて構成されている。
すなわち、セパレータにおける、箔状正極板の上記未形成部側の端部（上記第１の端部）に対して、箔状負極板の上記未形成部側の端部（上記第２の端部）よりも強い押圧力を作用させるように、電池筐体内において、電池筐体の内壁と発電要素との間に、発電要素を押圧する押圧部材を配置する。 In addition to the configuration of the first invention, the third invention of the present application is arranged such that the pressing means is disposed between an inner wall of a battery housing that houses the power generation element and the power generation element. It is comprised by the press member which presses the said electric power generation element.
That is, the end of the foil-shaped negative electrode plate on the non-formed part side (the second end part) with respect to the end of the foil-shaped positive electrode plate on the non-formed part side (the first end). In the battery casing, a pressing member that presses the power generation element is disposed between the inner wall of the battery casing and the power generation element so that a stronger pressing force is applied.

又、本出願の第４の発明は、上記第３の発明の構成に加えて、前記押圧部材は、略平行姿勢で対向する一対の押圧板と、その一対の押圧板の端部同士を連結する連結部とを有する形状に形成され、前記一対の押圧板が、前記発電要素を挟み込んで押圧する姿勢で配置されている。
すなわち、一対の押圧板を連結部で連結して構成した押圧部材で、発電要素を挟み込んで押圧する。 According to a fourth invention of the present application, in addition to the configuration of the third invention, the pressing member connects a pair of pressing plates facing each other in a substantially parallel posture and ends of the pair of pressing plates. The pair of pressing plates are arranged in a posture that sandwiches and presses the power generation element.
That is, the power generation element is sandwiched and pressed by a pressing member configured by connecting a pair of pressing plates by a connecting portion.

又、本出願の第５の発明は、上記第４の発明の構成に加えて、前記押圧部材の少なくとも一部が、前記設定方向で前記発電要素の両側に位置する前記電池筐体の一対の内壁に接当している。
すなわち、押圧部材が、前記設定方向の両端部において、電池筐体の一対の内壁によって位置規制され、一対の内壁間でつっぱり部材のように配置されるので、電池筐体に振動や衝撃が加わった際に、発電要素の変位を抑制することができる。 According to a fifth aspect of the present application, in addition to the configuration of the fourth aspect, at least a part of the pressing member is a pair of battery casings positioned on both sides of the power generation element in the setting direction. It touches the inner wall.
That is, the position of the pressing member is restricted by the pair of inner walls of the battery casing at both ends in the setting direction, and the pressing member is arranged like a pulling member between the pair of inner walls, so that vibration and impact are applied to the battery casing. In this case, the displacement of the power generation element can be suppressed.

又、本出願の第６の発明は、上記第５の発明の構成に加えて、前記電池筐体の内部空間が略直方体形状に形成され、前記電池筐体における、前記一対の押圧板が接当する内壁と前記一対の内壁との双方に直交する内壁に、前記押圧部材の前記連結部が接当する状態で配置されている。
すなわち、押圧部材の連結部も電池筐体の内壁に接当する状態で配置されるので、電池筐体内において、発電要素をより一層安定的に支持できる。 According to a sixth aspect of the present application, in addition to the configuration of the fifth aspect, the internal space of the battery casing is formed in a substantially rectangular parallelepiped shape, and the pair of pressing plates in the battery casing are in contact with each other. It arrange | positions in the state in which the said connection part of the said press member contact | connects the inner wall orthogonal to both the inner wall and said pair of inner walls which contact.
That is, since the connecting portion of the pressing member is also arranged in contact with the inner wall of the battery casing, the power generation element can be supported more stably in the battery casing.

又、本出願の第７の発明は、上記第３の発明の構成に加えて、前記押圧部材は、前記発電要素の外周に巻回した帯状部材にて構成されている。
すなわち、帯状部材を発電要素の外周に巻回して、発電要素を押圧する。 According to a seventh invention of the present application, in addition to the configuration of the third invention, the pressing member is constituted by a belt-like member wound around the outer periphery of the power generating element.
That is, the belt-shaped member is wound around the outer periphery of the power generation element to press the power generation element.

又、本出願の第８の発明は、上記第１の発明の構成に加えて、前記押圧手段は、前記発電要素の前記セパレータにおける、前記第１の端部を、電池筐体の外部から押圧するように構成されている。
すなわち、セパレータにおける、箔状正極板の上記未形成部側の端部（上記第１の端部）に対して、箔状負極板の上記未形成部側の端部（上記第２の端部）よりも強い押圧力を作用させるように、電池筐体の外部から押圧する。
電池筐体は、薄い板材にて構成される場合が多く、電池筐体の外部から押圧して電池筐体を変形させ、間接的に発電要素を押圧する。 According to an eighth aspect of the present application, in addition to the configuration of the first aspect, the pressing means presses the first end of the separator of the power generation element from the outside of the battery casing. Is configured to do.
That is, the end of the foil-shaped negative electrode plate on the non-formed part side (the second end part) with respect to the end of the foil-shaped positive electrode plate on the non-formed part side (the first end). ) Press from the outside of the battery housing to apply a stronger pressing force.
In many cases, the battery casing is formed of a thin plate material, and is pressed from outside the battery casing to deform the battery casing and indirectly press the power generation element.

又、本出願の第９の発明は、上記第８の発明の構成に加えて、前記押圧手段は、複数の電池を並べて構成される電池モジュールにおいて、電池間に配置されるスペーサにて構成されている。
すなわち、複数の電池を連結して電池モジュールとして構成する場合、電池間にスペーサを配置して、複数の電池と電池間のスペーサとを一体にして緊圧をかける構成となる。
このスペーサの形状を、セパレータにおける、箔状正極板の上記未形成部側の端部（上記第１の端部）に対して、箔状負極板の上記未形成部側の端部（上記第２の端部）よりも強い押圧力を作用させる形状とするのである。 According to a ninth invention of the present application, in addition to the configuration of the eighth invention, the pressing means is configured by a spacer arranged between the batteries in a battery module configured by arranging a plurality of batteries. ing.
That is, when a plurality of batteries are connected to form a battery module, a spacer is arranged between the batteries, and the plurality of batteries and the spacers between the batteries are integrated to apply tight pressure.
The shape of the spacer is such that the end of the foil-shaped negative electrode plate on the side of the unformed part (the first end) is the end of the foil-shaped negative electrode plate (the first end). The shape is such that a pressing force stronger than that of the second end portion is applied.

又、本出願の第１０の発明は、上記第１〜第９のいずれかの発明の構成に加えて、前記発電要素は、長尺帯状に形成された前記箔状正極板と長尺帯状に形成された前記箔状負極板とを、長尺帯状に形成された前記セパレータを挟んだ状態で、前記設定方向を巻回軸芯方向とする巻回軸芯周りに巻回して構成され、前記箔状正極板及び前記箔状負極板の幅方向端部に前記未形成部が形成され、前記箔状正極板の前記未形成部と前記箔状負極板の前記未形成部とは、前記幅方向で逆側に位置し、且つ、前記セパレータ及び対向する前記箔状負極板又は前記箔状正極板よりも前記幅方向で突出する状態で配置されている。
すなわち、発電要素をいわゆる巻回型の発電要素として構成するものであり、巻回型の発電要素において、セパレータが熱で収縮する際に、箔状負極板の上記未形成部側から先行して短絡し、箔状負極板の上記未形成部側での短絡によって、過大な電流による発熱を伴うことなく、緩やかに故障していく。
又、本出願の第１１の発明は、夫々活物質層を形成した箔状正極板と箔状負極板とをセパレータを挟んだ状態で積層した発電要素が備えられ、前記発電要素における設定方向の端部において、前記箔状正極板及び前記箔状負極板に前記活物質層を形成していない未形成部が配置され、前記箔状正極板の前記未形成部と前記箔状負極板の前記未形成部とは、前記設定方向で逆側に位置し、且つ、前記セパレータ及び対向する前記箔状負極板又は前記箔状正極板よりも前記設定方向で突出する状態で配置された電池において、前記箔状正極板の前記未形成部側に位置する第１の端部から前記箔状負極板の前記未形成部側に位置する第２の端部に亘って配置されている前記セパレータにおいて、前記第１の端部が、前記第２の端部よりも強く押圧される状態とする押圧手段が備えられ、前記押圧手段は、前記セパレータにおける前記第１の端部側の端縁を押圧している。 In addition to the configuration of any one of the first to ninth inventions, the tenth invention of the present application is characterized in that the power generating element has a long strip shape with the foil-like positive electrode plate formed in a long strip shape. The foil-shaped negative electrode plate formed is wound around a winding axis with the setting direction as a winding axis direction, with the separator formed in a long strip shape interposed therebetween, and The unformed portion is formed at the widthwise ends of the foil-shaped positive electrode plate and the foil-shaped negative electrode plate, and the unformed portion of the foil-shaped positive electrode plate and the unformed portion of the foil-shaped negative electrode plate are the width It is located on the opposite side in the direction, and is disposed in a state of projecting in the width direction with respect to the separator and the opposing foil-like negative electrode plate or foil-like positive electrode plate.
That is, the power generation element is configured as a so-called wound-type power generation element, and in the wound-type power generation element, when the separator contracts by heat, the foil-shaped negative electrode plate precedes from the unformed portion side. A short circuit occurs at the unformed portion side of the foil-like negative electrode plate, and the failure occurs gradually without accompanying heat generation due to an excessive current.
An eleventh invention of the present application is provided with a power generation element in which a foil-like positive electrode plate and a foil-like negative electrode plate each having an active material layer formed thereon are sandwiched with a separator interposed therebetween. In the end portion, an unformed portion where the active material layer is not formed is disposed on the foil-shaped positive electrode plate and the foil-shaped negative electrode plate, and the unformed portion of the foil-shaped positive electrode plate and the foil-shaped negative electrode plate The unformed part is located on the opposite side in the setting direction, and in the battery disposed in a state protruding in the setting direction from the separator and the foil-like negative electrode plate or the foil-like positive electrode plate facing the separator, In the separator disposed from the first end located on the unformed part side of the foil-like positive electrode plate to the second end located on the unformed part side of the foil-like negative electrode plate, The first end is pressed more strongly than the second end. Pressing means provided to that state, the pressing means presses the edge of the first end portion side of the separator.

上記第１の発明によれば、箔状負極板の上記未形成部側で、抵抗の高い活物質層を形成した箔状正極板との間で先行して短絡が発生し、過大な電流による発熱を伴うことなく、緩やかに故障していくので、箔状正極板の上記未形成部と箔状負極板との間で生じる短絡故障を可及的に抑制して、過大な発熱を防止することができる。
もって、箔状正極板に高抵抗層を形成する工程を不要とするか、あるいは、高抵抗層を設けるにしても、簡易的なもので済ませることで、製造コストの上昇を抑制しながら、電池の発熱を抑制できるものとなった。
又、上記第２の発明によれば、電池筐体の形状設定だけで、発電要素に適切な押圧力を印加できるので、装置コストの上昇を抑制しながら電池の過大な発熱を防止することができる。
更には、電池筐体で発電要素を押圧するので、発電要素を安定的に支持できる。
又、上記第３の発明によれば、電池筐体の内壁と発電要素との間に、発電要素を押圧する押圧部材を配置するだけで、発電要素に適切な押圧力を印加できるので、簡便に電池の過大な発熱を防止することができる。
更には、電池筐体の内壁と発電要素との間に配置される押圧部材で発電要素を押圧するので、発電要素を安定的に支持できる。 According to the first aspect of the invention, a short circuit occurs in advance with the foil-shaped positive electrode plate on which the active material layer having a high resistance is formed on the unformed portion side of the foil-shaped negative electrode plate. Since it gradually fails without heat generation, short circuit failure that occurs between the unformed part of the foil-shaped positive electrode plate and the foil-shaped negative electrode plate is suppressed as much as possible to prevent excessive heat generation. be able to.
Therefore, the process of forming the high resistance layer on the foil-like positive electrode plate is not required, or even if the high resistance layer is provided, the battery can be simplified while suppressing the increase in manufacturing cost. The heat generation can be suppressed.
In addition, according to the second aspect of the present invention, it is possible to apply an appropriate pressing force to the power generation element only by setting the shape of the battery casing, so that excessive heat generation of the battery can be prevented while suppressing an increase in device cost. it can.
Furthermore, since the power generation element is pressed by the battery casing, the power generation element can be stably supported.
In addition, according to the third aspect of the present invention, an appropriate pressing force can be applied to the power generation element simply by placing a pressing member that presses the power generation element between the inner wall of the battery casing and the power generation element. In addition, excessive heat generation of the battery can be prevented.
Furthermore, since the power generation element is pressed by the pressing member disposed between the inner wall of the battery casing and the power generation element, the power generation element can be stably supported.

又、上記第４の発明によれば、一対の押圧板を連結部で連結して構成した押圧部材で、発電要素を挟み込んで押圧するので、押圧部材の組み付け作業を簡単な作業で行える。
又、上記第５の発明によれば、電池の過大な発熱を防止するための押圧部材を、発電要素の変位を抑制することにも利用できるので、コスト上昇を抑制しながら、電池の機能向上を図ることができる。
又、上記第６の発明によれば、押圧部材の連結部も電池筐体の内壁に接当する状態で配置されるので、電池筐体内において、発電要素をより一層安定的に支持でき、更に電池の機能向上を図ることができる。 According to the fourth aspect of the invention, since the power generation element is sandwiched and pressed by the pressing member constituted by connecting the pair of pressing plates by the connecting portion, the pressing member can be assembled by a simple operation.
In addition, according to the fifth aspect, the pressing member for preventing excessive heat generation of the battery can be used for suppressing the displacement of the power generation element, so that the function of the battery is improved while suppressing the cost increase. Can be achieved.
Further, according to the sixth invention, since the connecting portion of the pressing member is also disposed in contact with the inner wall of the battery casing, the power generation element can be supported more stably in the battery casing, and further The function of the battery can be improved.

又、上記第７の発明によれば、帯状部材を発電要素の外周に巻回して、発電要素を押圧するので、発電要素を確実に押圧することができる。
又、上記第８の発明によれば、電池筐体の外部から押圧して電池筐体を変形させ、間接的に発電要素を押圧するので、電池筐体や電池筐体内部の構成に変更を加えることなく、簡便に電池の過大な発熱を防止することができる。
更には、電池筐体を変形させて発電要素を押圧するので、発電要素を安定的に支持できる。
又、上記第９の発明によれば、電池モジュールに使用されるスペーサを、発電要素の押圧のためにも利用するので、装置コストの上昇を可及的に抑制しながら、電池の過大な発熱を抑制することができる。
又、上記第１０の発明によれば、巻回型の発電要素を有する電池において、箔状正極板の上記未形成部と箔状負極板との間で生じる短絡故障を可及的に抑制して、過大な発熱を防止することができる。 Moreover, according to the said 7th invention, since a strip | belt-shaped member is wound around the outer periphery of a power generation element, and a power generation element is pressed, a power generation element can be pressed reliably.
According to the eighth aspect of the invention, since the battery casing is deformed by pressing from the outside of the battery casing and the power generation element is indirectly pressed, the configuration of the battery casing or the battery casing is changed. Without adding, it is possible to easily prevent excessive heat generation of the battery.
Furthermore, since the power generation element is pressed by deforming the battery casing, the power generation element can be stably supported.
According to the ninth aspect of the invention, since the spacer used in the battery module is also used for pressing the power generation element, excessive heat generation of the battery is suppressed while suppressing an increase in device cost as much as possible. Can be suppressed.
According to the tenth aspect of the invention, in a battery having a wound-type power generation element, a short-circuit failure occurring between the unformed portion of the foil-like positive electrode plate and the foil-like negative electrode plate is suppressed as much as possible. Thus, excessive heat generation can be prevented.

本発明の実施の形態にかかる電池の外観斜視図1 is an external perspective view of a battery according to an embodiment of the present invention. 本発明の第１実施形態にかかる電池の内部構成を示す斜視図The perspective view which shows the internal structure of the battery concerning 1st Embodiment of this invention. 本発明の第１実施形態にかかる電池筐体の斜視図及び平面図The perspective view and top view of the battery housing | casing concerning 1st Embodiment of this invention. 本発明の実施の形態にかかる発電要素の斜視図The perspective view of the electric power generation element concerning embodiment of this invention 本発明の第１実施形態に関連する他の実施形態を示す平面図The top view which shows other embodiment relevant to 1st Embodiment of this invention. 本発明の第２実施形態にかかる電池の内部構成を示す斜視図The perspective view which shows the internal structure of the battery concerning 2nd Embodiment of this invention. 本発明の第２実施形態に関連する他の実施形態の電池の内部構成を示す斜視図The perspective view which shows the internal structure of the battery of other embodiment relevant to 2nd Embodiment of this invention. 本発明の第２実施形態に関連する他の実施形態の電池の内部構成を示す斜視図The perspective view which shows the internal structure of the battery of other embodiment relevant to 2nd Embodiment of this invention. 本発明の第２実施形態に関連する他の実施形態の電池の内部構成を示す斜視図The perspective view which shows the internal structure of the battery of other embodiment relevant to 2nd Embodiment of this invention. 本発明の第２実施形態に関連する他の実施形態の電池の内部構成を示す斜視図The perspective view which shows the internal structure of the battery of other embodiment relevant to 2nd Embodiment of this invention. 本発明の第３実施形態にかかる電池の外観斜視図External perspective view of a battery according to a third embodiment of the present invention. 本発明の第３実施形態にかかる電池モジュールの平面図The top view of the battery module concerning 3rd Embodiment of this invention. 本発明のその他の実施形態にかかる電池筐体の斜視図及び平面視による電池の概略断面図The perspective view of the battery housing | casing concerning other embodiment of this invention, and schematic sectional drawing of the battery by planar view 本発明のその他の実施形態にかかる電池の外観斜視図External perspective view of a battery according to another embodiment of the present invention. 本発明のその他の実施形態にかかる平面視による電池の概略断面図The schematic sectional drawing of the battery by planar view concerning other embodiment of this invention 本発明のその他の実施形態にかかる押圧手段の概略形状を示す図The figure which shows schematic shape of the press means concerning other embodiment of this invention.

以下、本発明の電池の実施の形態を図面に基づいて説明する。
本実施の形態では、電池として二次電池の１例である非水電解液二次電池（より具体的にはリチウムイオン電池）を例示して説明する。 Hereinafter, embodiments of the battery of the present invention will be described with reference to the drawings.
In the present embodiment, a non-aqueous electrolyte secondary battery (more specifically, a lithium ion battery) which is an example of a secondary battery will be described as an example.

〔第１実施形態〕
図１の斜視図に示すように、本第１実施形態の非水電解液二次電池ＲＢは、缶体１の開放面に蓋部２を被せて溶接して構成した電池筐体ＢＣ（以下において、単に「筐体ＢＣ」と称する）を有している。蓋部２は、短冊状の長方形の板材にて形成され、それの筐体ＢＣ外方側となる面に正極の電極端子である端子ボルト５と負極の電極端子である端子ボルト７とが取り付けられている。
缶体１は蓋部２の形状に合わせて扁平形状の直方体であり、従って、筐体ＢＣ全体としても扁平な略直方体形状を有しており、筐体ＢＣの内部空間も略直方体形状となっている。 [First Embodiment]
As shown in the perspective view of FIG. 1, the non-aqueous electrolyte secondary battery RB of the first embodiment includes a battery casing BC (hereinafter referred to as “welded”) that covers the open surface of the can 1 and covers the lid 2. In this case, the device is simply referred to as “casing BC”. The lid portion 2 is formed of a strip-shaped rectangular plate material, and a terminal bolt 5 that is a positive electrode terminal and a terminal bolt 7 that is a negative electrode terminal are attached to a surface on the outer side of the casing BC. It has been.
The can 1 is a flat rectangular parallelepiped in accordance with the shape of the lid portion 2, and thus has a flat and substantially rectangular parallelepiped shape as a whole of the casing BC, and the internal space of the casing BC also has a substantially rectangular parallelepiped shape. ing.

筐体ＢＣの内方側には、図２において２点鎖線で示す発電要素３と集電体４，６とが電解液に一部浸される状態で収納配置されている。図２は、缶体１を除いた状態で、下方側から見上げた斜視図として、筐体ＢＣの内方側を示している。
集電体４，６は、発電要素３と端子ボルト５，７とを電気的に接続するための部材であり、何れも導電体にて形成されている。
集電体４と集電体６とは、略同一形状のものが対称に配置される関係となっているが、材質が異なっており、正極側の集電体４はアルミニウムを主成分とする材料にて形成され、負極側の集電体６は銅を主成分とする材料にて形成されている。 On the inner side of the casing BC, the power generation element 3 and current collectors 4 and 6 indicated by a two-dot chain line in FIG. 2 are housed and arranged in a state of being partially immersed in the electrolyte. FIG. 2 shows the inner side of the casing BC as a perspective view looking up from the lower side with the can 1 removed.
The current collectors 4 and 6 are members for electrically connecting the power generation element 3 and the terminal bolts 5 and 7, and both are formed of a conductor.
The current collector 4 and the current collector 6 have a relationship in which substantially the same shape is arranged symmetrically, but the materials are different, and the current collector 4 on the positive electrode side is mainly composed of aluminum. The current collector 6 on the negative electrode side is formed of a material mainly composed of copper.

集電体４，６の概略形状は、上記の金属材料の板状部材を、筐体ＢＣの短辺側の側面に沿う姿勢で屈曲形成して略Ｌ字状としており、端子ボルト５，７の配置面である蓋部２の表面に沿って延びる部分と、蓋部２の長手方向端部付近で下方側へ９０度屈曲して、蓋部２の法線方向に延びる縦姿勢部分とが連なる形状を有している。集電体４，６の上記縦姿勢部分において、更に発電要素３側に屈曲させて、発電要素３と接続するための接続部４ａ，６ａが形成されている。   The schematic shape of the current collectors 4 and 6 is such that the above-described metal material plate-like member is bent and formed in a posture along the side surface on the short side of the casing BC to have a substantially L shape. A portion extending along the surface of the lid portion 2 that is an arrangement surface of the lid portion, and a vertical posture portion that is bent 90 degrees downward near the longitudinal end portion of the lid portion 2 and extends in the normal direction of the lid portion 2. It has a continuous shape. In the vertical posture portions of the current collectors 4, 6, connection portions 4 a, 6 a for being bent further toward the power generation element 3 side and connected to the power generation element 3 are formed.

発電要素３は、図４に示すように、長尺帯状に形成された箔状正極板３１と長尺帯状に形成された箔状負極板３２とからなる一対の電極板３１，３２の夫々に、活物質層を塗布により形成して、それらを同じく長尺帯状のセパレータ３３を挟んで巻回する状態で積層した、いわゆる巻回型の発電要素として構成されている。箔状正極板３１等は、扁平の巻回軸周りに巻回され、巻回したものも、電池筐体ＢＣの形状に合わせて扁平形状となっている。
図４では、活物質の塗布領域を２重の斜線で示している。 As shown in FIG. 4, the power generating element 3 includes a pair of electrode plates 31, 32 each composed of a foil-like positive electrode plate 31 formed in a long strip shape and a foil-like negative electrode plate 32 formed in a long strip shape. The active material layer is formed by coating, and is formed as a so-called wound-type power generation element in which the active material layers are stacked in a state of being wound around the same long strip-shaped separator 33. The foil-like positive electrode plate 31 and the like are wound around a flat winding axis, and the wound one has a flat shape in accordance with the shape of the battery casing BC.
In FIG. 4, the application area | region of the active material is shown with the double diagonal line.

箔状正極板３１及び箔状負極板３２における活物質層の形成状態は、夫々の幅方向端部に、活物質層を形成していない未形成部３ａ，３ｂを形成している。換言すると、発電要素３の巻回軸芯方向を設定方向として、その設定方向の端部に未形成部３ａ，３ｂを配置している。
本第１実施形態及び以下の各実施形態では活物質層を塗布によって形成する場合を例示しているので、以下において、上記「未形成部３ａ，３ｂ」を、一般的な呼称である「未塗工部３ａ，３ｂ」と称する。
箔状正極板３１の未塗工部３ａと、箔状負極板３２の未塗工部３ｂとは、箔状正極板３１等の幅方向（上記設定方向、すなわち、発電要素３の巻回軸芯方向と一致）で反対側（逆側）の端部に位置しており、箔状正極板３１の未塗工部３ａは、箔状負極板３２及びセパレータ３３の端縁よりも上記幅方向に突出し、箔状負極板３２の未塗工部３ｂは、箔状正極板３１及びセパレータ３３の端縁よりも上記幅方向に突出している。又、セパレータ３３の上記幅方向での長さは、箔状正極板３１及び箔状負極板３２の活物質塗布幅よりも若干幅広に設定しており、箔状正極板３１の未塗工部３ａ側に位置する端部（第１の端部）から箔状負極板３２の未塗工部３ｂ側に位置する端部（第２の端部）に亘って配置されている。
従って、箔状正極板３１，箔状負極板３２及びセパレータ３３を巻回した状態では、図４に示すように、巻回軸芯方向の両端部に未塗工部３ａ，３ｂが位置する。
発電要素３の缶体１内での配置姿勢は、箔状正極板３１等の巻回軸心が蓋部２の長手方向と平行となる姿勢としており、発電要素３を集電体４，６と接合する際は、集電体４の接続部４ａを箔状正極板３１の未塗工部３ａの並びの隙間に入り込ませた状態で、束ねた未塗工部３ａと接続部４ａとを溶接し、集電体６の接続部６ａを箔状負極板３２の未塗工部３ｂの並びの隙間に入り込ませた状態で、束ねた未塗工部３ｂと接続部６ａとを溶接する。尚、集電体４，６の接続部４ａ，６ａと未塗工部３ａ，３ｂとの接続態様としては、未塗工部３ａ，３ｂの外側に接続部４ａ，６ａが位置する位置関係として、両者を溶接するようにしても良い。 The formation state of the active material layer in the foil-like positive electrode plate 31 and the foil-like negative electrode plate 32 forms unformed portions 3a and 3b in which the active material layer is not formed at the respective end portions in the width direction. In other words, the winding axis direction of the power generation element 3 is set as the setting direction, and the non-formed portions 3a and 3b are arranged at the ends in the setting direction.
In the first embodiment and each of the following embodiments, the case where the active material layer is formed by coating is illustrated. Therefore, in the following description, the “unformed portions 3a and 3b” are generally referred to as “unformed”. The coating parts 3a and 3b "will be referred to.
The uncoated portion 3a of the foil-shaped positive electrode plate 31 and the uncoated portion 3b of the foil-shaped negative electrode plate 32 are the width direction of the foil-shaped positive electrode plate 31 or the like (the set direction, that is, the winding axis of the power generating element 3). The uncoated portion 3a of the foil-like positive electrode plate 31 is located in the width direction above the edges of the foil-like negative electrode plate 32 and the separator 33. The uncoated portion 3 b of the foil-like negative electrode plate 32 protrudes in the width direction from the edges of the foil-like positive electrode plate 31 and the separator 33. Moreover, the length of the separator 33 in the width direction is set to be slightly wider than the active material application width of the foil-like positive electrode plate 31 and the foil-like negative electrode plate 32, and the uncoated portion of the foil-like positive electrode plate 31. It arrange | positions ranging from the edge part (2nd edge part) located in the uncoated part 3b side of the foil-shaped negative electrode plate 32 from the edge part (1st edge part) located in 3a side.
Therefore, in the state where the foil-like positive electrode plate 31, the foil-like negative electrode plate 32 and the separator 33 are wound, the uncoated portions 3a and 3b are located at both ends in the winding axis direction as shown in FIG.
The arrangement posture of the power generation element 3 in the can 1 is such that the winding axis of the foil-like positive electrode plate 31 and the like is parallel to the longitudinal direction of the lid 2, and the power generation element 3 is arranged as the current collectors 4, 6. In the state where the connecting portion 4a of the current collector 4 is inserted into the gap between the uncoated portions 3a of the foil-like positive electrode plate 31, the bundled uncoated portion 3a and the connecting portion 4a are joined together. Welding is performed, and the bundled uncoated portions 3b and the connecting portions 6a are welded in a state where the connecting portions 6a of the current collector 6 are inserted into the gaps between the uncoated portions 3b of the foil-like negative electrode plate 32. In addition, as a connection aspect of the connection parts 4a and 6a of the collectors 4 and 6 and the uncoated parts 3a and 3b, as a positional relationship in which the connection parts 4a and 6a are located outside the uncoated parts 3a and 3b. Both may be welded.

上述のように金属製（具体的には、アルミニウムを主成分とする金属製）の蓋部２に取り付けられている正極側の端子ボルト５は正極側の集電体４に電気的に接続され、負極側の端子ボルト７は負極側の集電体６に電気的に接続されている。
正極側の集電体４は、端子ボルト５の頭部側に一体形成されているリベット８を経て端子ボルト５に電気的に接続され、リベット８は、集電体４，集電体４及びリベット８と蓋部２との間の電気的絶縁のための下部ガスケット１２，蓋部２，リベット８を含む端子ボルト５と蓋部２との間の電気的絶縁のための上部ガスケット１１を貫通した状態で、筐体ＢＣ内方側端部でかしめられ、これによって集電体４を蓋部２に固定している。
負極側も同様の構成であり、負極側の集電体６は、端子ボルト７の頭部側に一体形成されているリベット１５を経て端子ボルト７に電気的に接続され、リベット１５は、集電体６，集電体６及びリベット１５と蓋部２との間の電気的絶縁のための下部ガスケット１８，蓋部２，リベット１５を含む端子ボルト７と蓋部２との間の電気的絶縁のための上部ガスケット１７を貫通した状態で、筐体ＢＣ内方側端部でかしめられ、これによって集電体６を蓋部２に固定している。 As described above, the terminal bolt 5 on the positive electrode side attached to the lid portion 2 made of metal (specifically, metal mainly composed of aluminum) is electrically connected to the current collector 4 on the positive electrode side. The negative terminal bolt 7 is electrically connected to the negative current collector 6.
The current collector 4 on the positive electrode side is electrically connected to the terminal bolt 5 via a rivet 8 integrally formed on the head side of the terminal bolt 5, and the rivet 8 includes the current collector 4, the current collector 4, and the current collector 4. Lower gasket 12 for electrical insulation between rivet 8 and lid 2, upper gasket 11 for electrical insulation between lid 2 and terminal bolt 5 including lid 2 and rivet 8 and lid 2 In this state, the current collector 4 is caulked at the inner end portion of the casing BC, thereby fixing the current collector 4 to the lid portion 2.
The negative electrode side has the same configuration, and the negative electrode side current collector 6 is electrically connected to the terminal bolt 7 via a rivet 15 integrally formed on the head side of the terminal bolt 7. The electrical current between the terminal 6 including the electrical current 6, the current collector 6 and the lower gasket 18 for electrical insulation between the rivet 15 and the lid 2, the lid 2 and the rivet 15 and the lid 2 The current collector 6 is fixed to the lid portion 2 by being caulked at the inner end of the casing BC in a state of passing through the upper gasket 17 for insulation.

筐体ＢＣを構成する缶体１は、金属製（より具体的には、アルミニウムを主成分とする金属製）であり、図３に示すように、有底筒状（より具体的には有底矩形筒状）に形成され、缶体１を平面視で示す図３（ｂ）にも示すように、缶体１の内壁には、発電要素３の配置空間を挟んで対称位置に、段差状の凸部１ａが形成されている。
この凸部１ａの存在によって、缶体１の内部空間における発電要素３の収納幅が部分的に狭くなっている。
この凸部１ａの形成位置は、横方向（矢印Ｃで示す発電要素３の巻回軸芯方向）では、蓋部２に組み付けた発電要素３を缶体１内に挿入して、図３において２点鎖線にて示す位置に位置させたときに、図４において矢印Ａにて指し示すセパレータ３３における箔状正極板３１の未塗工部３ａ側の端部（上記第１の端部）から、幅方向の中央寄りの設定位置に至る範囲に位置している。又、上下方向での凸部１ａの形成位置は、発電要素３の外周の扁平面の略全体を覆う範囲としている。
発電要素３の厚さ方向（扁平面の法線方向）での幅は、集電体４，６と接合した発電要素３に外圧を加えない状態では、上記の缶体１の内部空間において、凸部１ａを形成していない領域での短辺方向での幅（図３（ｂ）において「Ｗ」で示す幅）に対して、略一致するように設定されており、一対の凸部１ａの形成範囲で発電要素３の収納幅が狭くなっていることで、凸部１ａが発電要素３を押圧することになる。
従って、発電要素３を収納する電池筐体ＢＣの内部空間において、セパレータ３３における箔状正極板３１の未塗工部３ａ側の端部（上記第２の端部）に対する収納幅を、箔状負極板３２の未塗工部３ｂ側の端部に対する収納幅よりも幅狭に設定することによって、発電要素３のセパレータ３３における、箔状正極板３１の未塗工部３ａ側の端部が、箔状負極板３２の未塗工部３ｂ側の端部よりも強く押圧される状態とする押圧手段ＰＳが構成されている。 The can 1 constituting the casing BC is made of metal (more specifically, made of metal containing aluminum as a main component), and has a bottomed cylindrical shape (more specifically, as shown in FIG. 3). 3 (b) showing the can body 1 in plan view, the inner wall of the can body 1 has a step at a symmetrical position with the arrangement space for the power generating element 3 in between. A convex portion 1a is formed.
Due to the presence of the convex portion 1a, the housing width of the power generating element 3 in the internal space of the can 1 is partially narrowed.
In the horizontal direction (in the direction of the winding axis of the power generating element 3 indicated by the arrow C), the projecting portion 1a is formed by inserting the power generating element 3 assembled to the lid portion 2 into the can body 1 in FIG. When positioned at the position indicated by the two-dot chain line, from the end (the first end) on the uncoated portion 3a side of the foil-like positive electrode plate 31 in the separator 33 indicated by the arrow A in FIG. It is located in the range that reaches the set position near the center in the width direction. Moreover, the formation position of the convex part 1a in the vertical direction is a range that covers substantially the entire flat surface of the outer periphery of the power generation element 3.
The width of the power generation element 3 in the thickness direction (the normal direction of the flat surface) is such that, in the state where no external pressure is applied to the power generation element 3 joined to the current collectors 4 and 6, It is set so as to substantially match the width in the short side direction (the width indicated by “W” in FIG. 3B) in the region where the convex portion 1a is not formed, and the pair of convex portions 1a. Since the storage width of the power generation element 3 is narrow in the formation range, the convex portion 1 a presses the power generation element 3.
Therefore, in the internal space of the battery casing BC that houses the power generating element 3, the storage width of the separator 33 with respect to the end portion (the second end portion) of the foil-like positive electrode plate 31 on the uncoated part 3a side is foil-like. By setting the width of the negative electrode plate 32 to be narrower than the storage width with respect to the end portion on the uncoated portion 3b side, the end portion on the uncoated portion 3a side of the foil-like positive electrode plate 31 in the separator 33 of the power generation element 3 is The pressing means PS is configured to be pressed more strongly than the end of the foil-shaped negative electrode plate 32 on the uncoated part 3b side.

二次電池ＲＢとして組み立てた後に、何らかの理由によって発電要素３が過熱状態となると、その熱によってセパレータ３３が縮むが、上記のようにして、缶体１の内壁に形成されている凸部１ａによって、セパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、幅方向の中央寄りの設定位置に至る範囲が押圧されているので、セパレータ３３における箔状負極板３２の未塗工部３ｂ側の端部（図４において矢印Ｂで指し示す位置）が先行して縮むことになる。
この結果、箔状正極板３１における活物質塗布部分と箔状負極板３２とが短絡する。箔状正極板３１に塗布する活物質は、箔状負極板３２に塗布する活物質よりも抵抗が高く、この短絡によって流れる短絡電流によって発熱はするが、その発熱の程度は小さく、その状態を維持しながら徐々に二次電池ＲＢが故障して行く。 When the power generation element 3 is overheated for some reason after being assembled as the secondary battery RB, the separator 33 contracts due to the heat, but as described above, the convex portion 1a formed on the inner wall of the can body 1 Since the range from the end on the uncoated portion 3a side of the foil-shaped positive electrode plate 31 in the separator 33 to the set position near the center in the width direction is pressed, the uncoated foil-shaped negative electrode plate 32 in the separator 33 The end (the position indicated by the arrow B in FIG. 4) on the construction part 3b side is shrunk in advance.
As a result, the active material application portion of the foil-like positive electrode plate 31 and the foil-like negative electrode plate 32 are short-circuited. The active material applied to the foil-like positive electrode plate 31 has a higher resistance than the active material applied to the foil-like negative electrode plate 32, and heat is generated by the short-circuit current flowing through this short circuit, but the degree of heat generation is small, and the state is The secondary battery RB gradually fails while maintaining.

従って、上記押圧手段ＰＳが押圧する、セパレータ３３における箔状正極板３１の未塗工部３ａ側の端部の詳細な位置としては、必ずしもセパレータ３３の端縁を含む必要はない。
上記押圧手段ＰＳによるセパレータ３３に対する押圧位置は、上述のように、セパレータ３３の縮み方が、箔状正極板３１における活物質塗布部分と箔状負極板３２との短絡が先行して発生する縮み方となるように設定されていれば良い。 Therefore, it is not always necessary to include the edge of the separator 33 as the detailed position of the end of the foil-like positive electrode plate 31 in the separator 33 on the uncoated portion 3a side pressed by the pressing means PS.
As described above, the pressing position on the separator 33 by the pressing means PS is such that the separator 33 is contracted in such a manner that a short circuit between the active material application portion of the foil-shaped positive electrode plate 31 and the foil-shaped negative electrode plate 32 occurs in advance. It only has to be set so as to be.

缶体１の内壁に形成する凸部１ａの具体形状としては、図３に例示するもの以外にも各種の形状が考えられ、図３（ｂ）と同様の平面視で示す図５（ａ）〜図５（ｃ）のような形状としても良い。
図５（ａ）は、凸部１ａの段差の端部をテーパ状としたものを示しており、図５（ｂ）は、凸部１ａの段差を形成するについて、缶体１の壁厚さを変化させるのではなく、缶体１の壁面を、プレス加工等によって、缶体１の内方側へ突出させたものを示している。
又、図５（ｃ）は、凸部１ａの形状を単純な段差ではなく、半球状あるいは半円柱状の突起を整列させて凸部１ａを形成したものを示している。 As the specific shape of the convex portion 1a formed on the inner wall of the can body 1, various shapes other than those illustrated in FIG. 3 can be considered, and FIG. 5 (a) is shown in a plan view similar to FIG. 3 (b). -It is good also as a shape like FIG.5 (c).
FIG. 5A shows the end of the step of the convex portion 1a having a tapered shape, and FIG. 5B shows the wall thickness of the can 1 for forming the step of the convex portion 1a. The wall surface of the can body 1 is protruded inward of the can body 1 by pressing or the like.
Further, FIG. 5C shows a shape in which the convex portion 1a is formed by aligning hemispherical or semi-cylindrical projections, not the shape of the convex portion 1a.

〔第２実施形態〕
次に第２実施形態について説明する。
本第２実施形態は、上記第１実施形態とは、発電要素３のセパレータ３３における、箔状正極板３１の未塗工部３ａ側の端部が、箔状負極板３２の未塗工部３ｂ側の端部よりも強く押圧される状態とする押圧手段ＰＳの具体的な構成が異なる。
上記第１実施形態では、缶体１の内壁に凸部１ａを形成して、発電要素３を押圧しているが、本第２実施形態では、缶体１の各内壁は略一様な平面に形成し、缶体１の内壁と発電要素３との間に、図６に示すような押圧部材１３を上記押圧手段ＰＳとして挟み込むことで、発電要素３を押圧する。内壁に凸部１ａを形成しない点以外は、本第２実施形態の缶体１は、上記第１実施形態の缶体１と共通の構成であり、有底矩形筒状とする形状や金属製とする材質についても共通である。 [Second Embodiment]
Next, a second embodiment will be described.
The second embodiment is different from the first embodiment in that the end of the foil-like positive electrode plate 31 on the uncoated part 3a side in the separator 33 of the power generation element 3 is the uncoated part of the foil-like negative electrode plate 32. The specific configuration of the pressing means PS that is pressed more strongly than the end portion on the 3b side is different.
In the said 1st Embodiment, although the convex part 1a is formed in the inner wall of the can 1, and the electric power generation element 3 is pressed, in this 2nd Embodiment, each inner wall of the can 1 is a substantially uniform plane. The power generating element 3 is pressed by sandwiching a pressing member 13 as shown in FIG. 6 between the inner wall of the can 1 and the power generating element 3 as the pressing means PS. Except for not forming the convex portion 1a on the inner wall, the can body 1 of the second embodiment has the same configuration as the can body 1 of the first embodiment, and has a shape such as a bottomed rectangular tube shape or a metal shape. The same applies to the material.

図２に示す、蓋部２に、端子ボルト５，７や集電体４，６、並びに、発電要素３を組み付けた蓋部２側の組品の構成は、本第２実施形態と上記第１実施形態とで全く共通であり、又、図４に示す発電要素３の構成も、本第２実施形態と上記第１実施形態とで全く共通であり、それらの構成については説明を省略する。   The structure of the assembly on the side of the lid 2 in which the terminal bolts 5 and 7, the current collectors 4 and 6, and the power generation element 3 are assembled to the lid 2 shown in FIG. 2 is the same as that of the second embodiment and the above. The configuration of the power generation element 3 shown in FIG. 4 is completely the same as that of the first embodiment, and the configuration of the power generation element 3 shown in FIG. .

図６は、図２と対応させて示すもので、缶体１を取り除くと共に、発電要素３を２点鎖線で示して、下方側からの斜視図として示している。
図６に示す押圧部材１３は、発電要素３の外周形状に適合するように、長方形の板体をＵ字状に屈曲形成した形状を有しており、略平行姿勢で対向する一対の押圧板１３ａ，１３ｂと、その一対の押圧板１３ａ，１３ｂの端部同士を連結する連結部１３ｃとを有する形状に形成されている。
発電要素３における箔状正極板３１の未塗工部３ａ側の端部寄りの位置において、発電要素３を下方側から挟み込む状態で配置されて、一対の押圧板１３ａ，１３ｂが発電要素３を挟み込んで押圧している。
押圧部材１３の材質は、例えば樹脂により構成すれば良い。
より厳密な押圧部材１３の存在位置は、矢印Ｃで示す発電要素３の巻回軸芯方向（図６において矢印Ｃにて示す方向）では、図４において矢印Ａにて指し示すセパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、幅方向の中央寄りの設定位置に至る範囲に位置している。又、上下方向での押圧部材１３の存在範囲は、発電要素３の外周の扁平面の略全体を覆うと共に、下端側は缶体１の缶底に接当する範囲としており、発電要素３の下端と缶体１の缶底との間に押圧部材１３を配置して、二次電池ＲＢに振動や衝撃が作用した際に、押圧部材１３が発電要素３の下方側への移動を阻止する。
発電要素３の厚さ方向（扁平面の法線方向）での幅は、集電体４，６と接合した発電要素３に外圧を加えない状態では、上記の缶体１の内部空間における短辺方向での幅に略一致するように設定されているので、その発電要素３の外周面と缶体１の内壁との間に、上記押圧部材１３が存在することで、押圧部材１３が発電要素３を押圧することになる。 FIG. 6 is shown corresponding to FIG. 2, and the can body 1 is removed and the power generation element 3 is shown by a two-dot chain line as a perspective view from the lower side.
The pressing member 13 shown in FIG. 6 has a shape in which a rectangular plate is bent into a U shape so as to conform to the outer peripheral shape of the power generating element 3, and a pair of pressing plates facing each other in a substantially parallel posture. 13a and 13b, and the shape which has the connection part 13c which connects the edge parts of the pair of press plates 13a and 13b.
At a position near the end of the foil-like positive electrode plate 31 on the uncoated portion 3a side in the power generation element 3, the power generation element 3 is disposed in a state of being sandwiched from the lower side, and the pair of pressing plates 13a and 13b holds the power generation element 3 in between. It is sandwiched and pressed.
What is necessary is just to comprise the material of the press member 13 with resin, for example.
The more precise position of the pressing member 13 is the foil shape in the separator 33 indicated by the arrow A in FIG. 4 in the winding axis direction of the power generating element 3 indicated by the arrow C (the direction indicated by the arrow C in FIG. 6). It is located in a range from the end of the positive electrode plate 31 on the uncoated portion 3a side to a set position closer to the center in the width direction. In addition, the range in which the pressing member 13 exists in the vertical direction covers substantially the entire flat surface of the outer periphery of the power generation element 3, and the lower end side is in contact with the can bottom of the can body 1. The pressing member 13 is disposed between the lower end and the bottom of the can body 1, and the pressing member 13 prevents the power generating element 3 from moving downward when vibration or impact is applied to the secondary battery RB. .
The width of the power generation element 3 in the thickness direction (the normal direction of the flat surface) is short in the internal space of the can 1 in the state where no external pressure is applied to the power generation element 3 joined to the current collectors 4 and 6. Since it is set so as to substantially match the width in the side direction, the pressing member 13 exists between the outer peripheral surface of the power generation element 3 and the inner wall of the can 1, so that the pressing member 13 generates power. The element 3 will be pressed.

二次電池ＲＢとして組み立てた後に、何らかの理由によって発電要素３が過熱状態となると、その熱によってセパレータ３３が縮むが、上記のようにして、押圧部材１３が、セパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、幅方向の中央寄りの設定位置に至る範囲を押圧しているので、セパレータ３３における箔状負極板３２の未塗工部３ｂ側の端部（図４において矢印Ｂで指し示す位置）が先行して縮むことになる。
この結果、箔状正極板３１における活物質塗布部分と箔状負極板３２とが短絡する。箔状正極板３１に塗布する活物質は抵抗が高く、この短絡によって流れる短絡電流によって発熱はするが、その発熱の程度は小さく、その状態を維持しながら徐々に二次電池ＲＢが故障して行く。 When the power generating element 3 is overheated for some reason after being assembled as the secondary battery RB, the separator 33 contracts due to the heat. As described above, the pressing member 13 of the foil-like positive electrode plate 31 in the separator 33 is compressed. Since the range from the end portion on the uncoated portion 3a side to the set position near the center in the width direction is pressed, the end portion on the uncoated portion 3b side of the foil-like negative electrode plate 32 in the separator 33 (FIG. 4). The position indicated by the arrow B in FIG.
As a result, the active material application portion of the foil-like positive electrode plate 31 and the foil-like negative electrode plate 32 are short-circuited. The active material applied to the foil-like positive electrode plate 31 has high resistance, and heat is generated by a short-circuit current that flows due to this short circuit, but the degree of heat generation is small, and the secondary battery RB gradually fails while maintaining that state. go.

押圧部材１３の具体形状は、図６に示す形状のもの以外にも、各種の形状とすることができる。
それらの具体例を説明すると、先ず、図６と対応した下方側からの斜視図である図７に示すように、発電要素３の巻回軸芯方向（図７において矢印Ｃにて示す方向）での押圧部材１３の存在幅は、箔状正極板３１の未塗工部３ａ側端部の設定幅に限定せず、セパレータ３３の略全幅を覆うように設定しても良い。この場合でも、箔状正極板３１の未塗工部３ａ側と箔状負極板３２の未塗工部３ｂ側とで、押圧部材１３の厚さに差を付けて、箔状正極板３１の未塗工部３ａ側を厚く設定すれば、箔状正極板３１の未塗工部３ａ側で発電要素３をより強く押圧することになり、セパレータ３３は、箔状負極板３２の未塗工部３ｂ側から縮むことになる。 The specific shape of the pressing member 13 can be various shapes other than the shape shown in FIG.
Specific examples thereof will be described. First, as shown in FIG. 7, which is a perspective view from the lower side corresponding to FIG. 6, the winding axis direction of the power generating element 3 (the direction indicated by the arrow C in FIG. 7). The presence width of the pressing member 13 is not limited to the set width of the end of the foil-like positive electrode plate 31 on the uncoated part 3a side, and may be set so as to cover the substantially entire width of the separator 33. Even in this case, there is a difference in the thickness of the pressing member 13 between the uncoated portion 3a side of the foil-like positive electrode plate 31 and the uncoated portion 3b side of the foil-like negative electrode plate 32. If the uncoated portion 3a side is set thick, the power generating element 3 is pressed more strongly on the uncoated portion 3a side of the foil-shaped positive electrode plate 31, and the separator 33 is not coated with the foil-shaped negative electrode plate 32. It shrinks from the part 3b side.

又、図６と対応する図８に示すように、基本は図６に示すものと同様にＵ字状の屈曲形状としながら、更に、押圧部材１３の一部、より具体的には、押圧部材１３の下端部を、発電要素３の巻回軸芯方向に、先端が缶体１の内壁に接当する位置まで両側に延出させた延出部２１を備える構成としても良い。延出部２１の存在幅をこのように設定することで、延出部２１の両側の先端が、発電要素３の巻回軸芯と直交する一対の内壁（集電体４，６の縦姿勢部分が近接する内壁）に位置規制される。連結部１３ｃの下端側が缶体１の缶底に接当している点は、図６に示す構成と同様である。
延出部２１が、発電要素３の巻回軸芯と直交する一対の内壁に位置規制されることで、二次電池ＲＢに振動や衝撃が加わったときに、発電要素３の巻回軸芯方向において、押圧部材１３の移動が阻止される。押圧部材１３は、発電要素３を挟み込む状態で押圧しているので、結果として、発電要素３の変位が抑制されることになる。
更に、延出部２１の先端を位置規制している一対の内壁と、一対の押圧板１３ａ，１３ｂが接当している一対の内壁との双方に直交する内壁である缶底に押圧部材１３の連結部１３ｃが接当しているので、押圧部材１３に対して各方向から変位を抑制する構成となっており、その結果、二次電池ＲＢに振動や衝撃が加わった際の発電要素３の変位抑制効果も大となる。
押圧部材１３が発電要素３を押圧することによる効果は、図６によって説明したものと同様である。 Further, as shown in FIG. 8 corresponding to FIG. 6, the basic is a U-shaped bent shape similar to that shown in FIG. 6, and further, a part of the pressing member 13, more specifically, the pressing member. It is good also as a structure provided with the extension part 21 which extended the lower end part of 13 to the winding axis center direction of the electric power generation element 3 to the both sides to the position where a front-end | tip contacts the inner wall of the can 1. FIG. By setting the existence width of the extension part 21 in this way, the distal ends on both sides of the extension part 21 are a pair of inner walls (vertical posture of the current collectors 4, 6) perpendicular to the winding axis of the power generation element 3. The position is restricted to the inner wall where the part is close. The point that the lower end side of the connecting portion 13c is in contact with the bottom of the can 1 is the same as the configuration shown in FIG.
When the extension portion 21 is regulated in position by a pair of inner walls orthogonal to the winding axis of the power generation element 3, the winding axis of the power generation element 3 is applied when vibration or impact is applied to the secondary battery RB. In the direction, the movement of the pressing member 13 is prevented. Since the pressing member 13 presses the power generation element 3 in a sandwiched state, as a result, the displacement of the power generation element 3 is suppressed.
Further, the pressing member 13 is attached to the bottom of the can, which is an inner wall orthogonal to both the pair of inner walls that restrict the positions of the ends of the extending portions 21 and the pair of inner walls that are in contact with the pair of pressing plates 13a and 13b. Since the connecting portion 13c is in contact with the pressing member 13, displacement is suppressed from each direction, and as a result, the power generation element 3 when vibration or impact is applied to the secondary battery RB. The displacement suppression effect is also increased.
The effect of the pressing member 13 pressing the power generation element 3 is the same as that described with reference to FIG.

又、押圧部材１３の他の具体例としては、図６と対応する図９に示すように、発電要素３の巻回軸芯周りに発電要素３の外周に巻回した帯状部材としても良い。
図９に示す構成での押圧部材１３の存在位置は、矢印Ｃで示す発電要素３の巻回軸芯方向では、図４において矢印Ａにて指し示すセパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、幅方向の中央寄りの設定位置に至る範囲に位置している。又、押圧部材１３の下端が缶体１の缶底に接当している点も上述した押圧部材１３の他の具体例と同様であり、発電要素３の下端と缶体１の缶底との間に押圧部材１３を配置して、二次電池ＲＢに振動や衝撃が作用した際に、押圧部材１３が発電要素３の下方側への移動を阻止する。
図９に示す構成でも、発電要素３の厚さ方向（扁平面の法線方向）での幅は、集電体４，６と接合した発電要素３に外圧を加えない状態では、上記の缶体１の内部空間における短辺方向での幅に略一致するように設定されているので、その発電要素３の外周面と缶体１の内壁との間に、上記押圧部材１３が存在することで、押圧部材１３が発電要素３を押圧することになる。
押圧部材１３を、図９に示すように帯状とする具体的な手法としては、例えば、電気的絶縁材料にて構成される樹脂テープを発電要素３の外周に厚く巻回する手法でも良いし、帯状に樹脂成形する手法でも良い。 As another specific example of the pressing member 13, as shown in FIG. 9 corresponding to FIG. 6, a belt-like member wound around the outer periphery of the power generation element 3 around the winding axis of the power generation element 3 may be used.
In the configuration shown in FIG. 9, the pressing member 13 is located in the winding axis direction of the power generating element 3 indicated by the arrow C, and the foil-like positive electrode plate 31 in the separator 33 indicated by the arrow A in FIG. It is located in the range from the end on the part 3a side to the set position closer to the center in the width direction. Moreover, the point that the lower end of the pressing member 13 is in contact with the can bottom of the can body 1 is the same as the other specific example of the pressing member 13 described above, and the lower end of the power generation element 3 and the can bottom of the can body 1 When the pressing member 13 is disposed between the two and the secondary battery RB is subjected to vibration or impact, the pressing member 13 prevents the power generation element 3 from moving downward.
Even in the configuration shown in FIG. 9, the width of the power generation element 3 in the thickness direction (the normal direction of the flat surface) is the same as that of the above can in the state where no external pressure is applied to the power generation element 3 joined to the current collectors 4 and 6. The pressing member 13 is present between the outer peripheral surface of the power generation element 3 and the inner wall of the can body 1 because it is set so as to substantially match the width in the short side direction in the internal space of the body 1. Thus, the pressing member 13 presses the power generation element 3.
As a specific method of making the pressing member 13 into a strip shape as shown in FIG. 9, for example, a method of thickly winding a resin tape made of an electrically insulating material around the outer periphery of the power generation element 3 may be used. A technique of resin molding in a strip shape may be used.

又、押圧部材１３の更なる具体例としては、図６と対応する図１０（ａ）に示すように、長方形の板材をコの字状に屈曲形成すると共に、正極側の集電体４の背面側（発電要素３の存在側と反対側）から集電体４と発電要素３の未塗工部３ａ側とを挟み込むように配置する構成としても良い。すなわち、押圧部材１３の構成自体は、図６に示すものと同様に、略平行姿勢で対向する一対の押圧板１３ａ，１３ｂと、その一対の押圧板１３ａ，１３ｂの端部同士を連結する連結部１３ｃとを有する形状に形成するのであるが、一対の押圧板１３ａ，１３ｂが発電要素３を挟み込む方向が異なる。   Further, as a further specific example of the pressing member 13, as shown in FIG. 10A corresponding to FIG. 6, a rectangular plate material is bent into a U-shape, and the positive electrode side current collector 4 is formed. It is good also as a structure arrange | positioned so that the collector 4 and the uncoated part 3a side of the electric power generation element 3 may be pinched | interposed from the back side (opposite side where the electric power generation element 3 exists). That is, the configuration itself of the pressing member 13 is a connection that connects a pair of pressing plates 13a and 13b that face each other in a substantially parallel posture and ends of the pair of pressing plates 13a and 13b, as shown in FIG. However, the direction in which the pair of pressing plates 13a and 13b sandwich the power generating element 3 is different.

このように構成する場合も、押圧部材１３における一対の対向面が、発電要素３に対して、横方向では、図４において矢印Ａにて指し示すセパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、幅方向の中央寄りの設定位置に至る範囲を挟み込み、又、上下方向では、発電要素３の外周の扁平面の略全体を挟み込んでいる。
図１０（ａ）で示す具体例でも、発電要素３の厚さ方向（扁平面の法線方向）での幅は、集電体４，６と接合した発電要素３に外圧を加えない状態では、上記の缶体１の内部空間における短辺方向での幅に略一致するように設定されており、発電要素３の外周と缶体１の内壁との間に押圧部材１３を配置することで、押圧部材１３が発電要素３を押圧することになる。
更に、図１０（ａ）で示すコの字状の形状以外に、図１０（ａ）で示すものと同様の配置形態をとる押圧部材１３として、図１０（ｂ）で示すように、平面視でＵ字状に形成しても良いし、図１０（ｃ）に示すように、平面視で、円弧状部分と平行平板部分とを組み合わせた形状としても良い。 Also when comprised in this way, a pair of opposing surface in the press member 13 is the uncoated part of the foil-like positive electrode plate 31 in the separator 33 pointed by the arrow A in FIG. A range from the end on the 3a side to the set position near the center in the width direction is sandwiched, and in the vertical direction, substantially the entire flat surface on the outer periphery of the power generation element 3 is sandwiched.
Also in the specific example shown in FIG. 10A, the width of the power generation element 3 in the thickness direction (normal direction of the flat surface) is such that no external pressure is applied to the power generation element 3 joined to the current collectors 4 and 6. By setting the pressing member 13 between the outer periphery of the power generation element 3 and the inner wall of the can body 1, it is set so as to substantially match the width in the short side direction in the internal space of the can body 1. The pressing member 13 presses the power generation element 3.
Furthermore, as shown in FIG. 10 (b), as a pressing member 13 having the same arrangement form as shown in FIG. 10 (a) in addition to the U-shaped shape shown in FIG. It may be formed in a U-shape, or as shown in FIG. 10C, it may have a shape in which an arc-shaped portion and a parallel plate portion are combined in a plan view.

〔第３実施形態〕
次に第３実施形態について説明する。
本第３実施形態は、上記第１実施形態とは、発電要素３のセパレータ３３における、箔状正極板３１の未塗工部３ａ側の端部が、箔状負極板３２の未塗工部３ｂ側の端部よりも強く押圧される状態とする押圧手段ＰＳの具体的な構成が異なる。
上記第１実施形態や上記第２実施形態における押圧手段ＰＳが電池筐体ＢＣの内部に組み込まれているのに対して、本第３実施形態の押圧手段ＰＳは、発電要素３のセパレータ３３における、箔状正極板３１の未塗工部３ａ側の端部を、電池筐体ＢＣの外部から押圧するように構成されている。
すなわち、缶体１の外部から押圧して缶体１の壁面を撓ませることで、間接的に発電要素３を押圧する。
従って、上記第１実施形態のように、内壁に凸部１ａを形成する必要はないが、凸部１ａを形成しない点以外は、本第３実施形態の缶体１も、上記第１実施形態の缶体１と共通の構成であり、有底矩形筒状とする形状や金属製とする材質についても共通である。 [Third Embodiment]
Next, a third embodiment will be described.
The third embodiment is different from the first embodiment in that the end of the foil-like positive electrode plate 31 on the uncoated part 3a side in the separator 33 of the power generation element 3 is the uncoated part of the foil-like negative electrode plate 32. The specific configuration of the pressing means PS that is pressed more strongly than the end portion on the 3b side is different.
While the pressing means PS in the first embodiment and the second embodiment are incorporated in the battery casing BC, the pressing means PS in the third embodiment is used in the separator 33 of the power generation element 3. The end of the foil-like positive electrode plate 31 on the uncoated part 3a side is configured to be pressed from the outside of the battery casing BC.
That is, the power generation element 3 is indirectly pressed by pressing from the outside of the can body 1 and bending the wall surface of the can body 1.
Therefore, it is not necessary to form the convex portion 1a on the inner wall as in the first embodiment, but the can body 1 of the third embodiment is the same as the first embodiment except that the convex portion 1a is not formed. This is the same configuration as the can body 1 and is also common to the shape of a bottomed rectangular tube and the material made of metal.

図２に示す、蓋部２に、端子ボルト５，７や集電体４，６、並びに、発電要素３を組み付けた、蓋部２側の組品の構成は、本第３実施形態と上記第１実施形態とで全く共通であり、又、図４に示す発電要素３の構成も、本第３実施形態と上記第１実施形態とで全く共通であり、それらの構成については説明を省略する。   The structure of the assembly on the lid 2 side in which the terminal bolts 5 and 7, the current collectors 4 and 6, and the power generation element 3 are assembled to the lid 2 shown in FIG. 2 is the same as that of the third embodiment and the above. The configuration of the power generation element 3 shown in FIG. 4 is completely the same as that of the first embodiment, and the configuration of the power generation element 3 shown in FIG. 4 is completely the same between the third embodiment and the first embodiment. To do.

本第３実施形態の二次電池ＲＢは、図１１及び図１２に示すように、二次電池ＲＢを複数個並べた状態で備えた電池モジュールＢＭを構成しており、その電池モジュールＢＭにおいて、二次電池ＲＢ間に配置されるスペーサ４１を利用して、缶体１の外部から間接的に発電要素３を押圧している。すなわち、上記押圧手段ＰＳをスペーサ４１にて構成している。
電池モジュールＢＭは、二次電池ＲＢとスペーサ４１との位置関係を示す図１１及び二次電池ＲＢをスペーサ４１と共にケース４２に収納した状態を平面視で示す図１２に示すように、二次電池ＲＢ間にスペーサ４１を挟んだ状態で相互に密着させ、直方体形状のケース４２の内部空間に収納する。
図示を省略するが、ケース４２には、二次電池ＲＢの並び方向で対向する一対の側壁を接近方向に変位させることで、収納されている二次電池ＲＢに対して、二次電池ＲＢの並び方向で設定押圧力を作用させる機構が組み込まれており、二次電池ＲＢをケース４２に収納した状態で、二次電池ＲＢの並びに対していわゆる緊圧を印加する。 As shown in FIGS. 11 and 12, the secondary battery RB of the third embodiment constitutes a battery module BM including a plurality of secondary batteries RB arranged in the battery module BM. The power generation element 3 is indirectly pressed from the outside of the can 1 using the spacer 41 arranged between the secondary batteries RB. That is, the pressing means PS is constituted by the spacer 41.
As shown in FIG. 11 showing the positional relationship between the secondary battery RB and the spacer 41 and FIG. 12 showing the state in which the secondary battery RB is housed in the case 42 together with the spacer 41 in the battery module BM, The spacers 41 are in close contact with each other with the spacers 41 sandwiched between the RBs, and are stored in the internal space of the rectangular parallelepiped case 42.
Although illustration is omitted, the case 42 has a pair of side walls facing each other in the direction in which the secondary batteries RB are arranged in the approaching direction, thereby moving the secondary battery RB to the stored secondary battery RB. A mechanism for applying a set pressing force in the arrangement direction is incorporated, and so-called tight pressure is applied to the arrangement of the secondary batteries RB in a state where the secondary batteries RB are housed in the case 42.

スペーサ４１は、二次電池ＲＢの扁平面に相当する面積を有する板材に、矩形の台地状に突出する凸部４１ａを形成して構成しており、この凸部４１ａの形成位置は、二次電池ＲＢとスペーサ４１とを、図１１及び図１２に示す姿勢で重ね合わせた状態で、横方向（矢印Ｃで示す発電要素３の巻回軸芯方向）では、凸部４１ａが接触する二次電池ＲＢ内の発電要素３において、セパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、セパレータ３３の幅方向の中央寄りの設定位置に至る範囲に位置している。又、上下方向では、発電要素３の外周の扁平面の略全体を覆う範囲としている。
又、凸部４１ａの突出高さは、図１２に示すように二次電池ＲＢをケース４２に収納して緊圧した状態で、凸部４１ａの存在によって二次電池ＲＢの缶体１の壁面が凹状に湾曲したときに、その湾曲した凹状の空間内に収まる高さとしている。これによって、スペーサ４１における凸部４１ａを形成していない部分も二次電池ＲＢの缶体１表面に接当し、二次電池ＲＢ全体を安定した姿勢で押圧することができる。 The spacer 41 is formed by forming a convex portion 41a that protrudes in a rectangular plateau shape on a plate material having an area corresponding to the flat surface of the secondary battery RB. In a state where the battery RB and the spacer 41 are overlapped with each other in the posture shown in FIGS. 11 and 12, the secondary portion in which the convex portion 41a contacts in the lateral direction (in the winding axis direction of the power generating element 3 indicated by the arrow C). In the power generation element 3 in the battery RB, the separator 33 is located in a range from the end of the foil-like positive electrode plate 31 on the uncoated portion 3a side to the set position near the center of the separator 33 in the width direction. Further, in the vertical direction, the power generation element 3 has a range that covers substantially the entire flat surface on the outer periphery of the power generation element 3.
Further, the protruding height of the convex portion 41a is such that the wall surface of the can 1 of the secondary battery RB due to the presence of the convex portion 41a in a state where the secondary battery RB is housed in the case 42 and tightly pressed as shown in FIG. When it is concavely curved, it is set to a height that fits within the curved concave space. As a result, the portion of the spacer 41 where the convex portion 41a is not formed also comes into contact with the surface of the can 1 of the secondary battery RB, and the entire secondary battery RB can be pressed in a stable posture.

図１１及び図１２では、並べて配置する二次電池ＲＢの正極及び負極の向きを全て同一とする場合を例示しており、図１１に示すスペーサ４１の凸部４１ａは、スペーサ４１の裏面（反対側の面）にも形成されており、その形成位置は、スペーサ４１の板面に対して対称位置に設定されている。
二次電池ＲＢの正極及び負極の向きを交互として並べて配置する場合は、スペーサ４１の表裏で、凸部４１ａは、互いに逆側の端部寄り位置に配置される。
又、図示を省略するが、二次電池ＲＢの扁平面に接当するケース４２の一対の側板にも、スペーサ４１の凸部４１ａと同様の形状の凸部が、スペーサ４１の凸部４１ａの形成位置と対応する位置に形成されている。従って、厳密には、ケース４２も押圧手段ＰＳの一部を構成している。 11 and 12 exemplify a case where the directions of the positive electrode and the negative electrode of the secondary battery RB arranged side by side are the same, and the convex portion 41a of the spacer 41 shown in FIG. The surface of the spacer 41 is formed symmetrically with respect to the plate surface of the spacer 41.
In the case where the positive electrode and negative electrode directions of the secondary battery RB are alternately arranged and arranged, the convex portions 41 a are arranged on the front and back sides of the spacer 41 at positions opposite to the ends on the opposite side.
Although not shown, the pair of side plates of the case 42 that abuts the flat surface of the secondary battery RB also has a protrusion having the same shape as the protrusion 41a of the spacer 41. It is formed at a position corresponding to the formation position. Therefore, strictly speaking, the case 42 also constitutes a part of the pressing means PS.

発電要素３の厚さ方向（扁平面の法線方向）での幅は、集電体４，６と接合した発電要素３に外圧を加えない状態では、上記の缶体１の内部空間における短辺方向での幅に略一致するように設定されているので、上述のように、スペーサ４１の凸部４１ａ等が二次電池ＲＢの缶体１側面を両側から押圧して引退側に湾曲させると、その缶体１の側面の変形によって発電要素３を両側から押圧することになる。
上記二次電池ＲＢを図１２に示すように電池モジュールＢＭとして組み立てた後に、何らかの理由によって発電要素３が過熱状態となると、その熱によってセパレータ３３が縮むが、上記のようにして、凸部４１ａ等が、セパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、幅方向の中央寄りの設定位置に至る範囲を、缶体１の側板を介して押圧しているので、セパレータ３３における箔状負極板３２の未塗工部３ｂ側の端部（図４において矢印Ｂで指し示す位置）が先行して縮むことになる。
この結果、箔状正極板３１における活物質塗布部分と箔状負極板３２とが短絡する。箔状正極板３１に塗布する活物質は抵抗が高く、この短絡によって流れる短絡電流によって発熱はするが、その発熱の程度は小さく、その状態を維持しながら徐々に二次電池ＲＢが故障して行く。 The width of the power generation element 3 in the thickness direction (the normal direction of the flat surface) is short in the internal space of the can 1 in the state where no external pressure is applied to the power generation element 3 joined to the current collectors 4 and 6. Since it is set so as to substantially match the width in the side direction, as described above, the convex portion 41a of the spacer 41 presses the side surface of the can body 1 of the secondary battery RB from both sides to bend toward the retraction side. Then, the power generation element 3 is pressed from both sides by deformation of the side surface of the can body 1.
After the secondary battery RB is assembled as a battery module BM as shown in FIG. 12, if the power generating element 3 is overheated for some reason, the separator 33 contracts due to the heat. However, as described above, the protrusion 41a Is pressing the range from the end of the uncoated portion 3a side of the foil-shaped positive electrode plate 31 in the separator 33 to the set position closer to the center in the width direction via the side plate of the can body 1, The end of the separator 33 on the uncoated part 3b side of the foil-shaped negative electrode plate 32 (the position indicated by the arrow B in FIG. 4) is shrunk in advance.
As a result, the active material application portion of the foil-like positive electrode plate 31 and the foil-like negative electrode plate 32 are short-circuited. The active material applied to the foil-like positive electrode plate 31 has high resistance, and heat is generated by a short-circuit current that flows due to this short circuit, but the degree of heat generation is small, and the secondary battery RB gradually fails while maintaining that state. go.

〔その他の実施形態〕
以下、本発明のその他の実施形態を列記する。
（１）上記の各実施形態では、発電要素３及びそれを収納する電池筐体ＢＣの形状を扁平形状とする場合を例示しているが、扁平形状とする必要は必ずしもなく、例えば円柱形状とする場合にも本発明を適用できる。
（２）上記の各実施形態では、活物質を塗布した長尺帯状の箔状正極板３１等を巻回した巻回型の発電要素３を例示しているが、箔状正極板，箔状負極板及びセパレータを何れも平シート状に形成し、それらを積層して発電要素を構成する場合にも本発明を適用できる。 [Other Embodiments]
Hereinafter, other embodiments of the present invention will be listed.
(1) In each of the above embodiments, the case where the shape of the power generation element 3 and the battery casing BC storing the power generation element 3 is a flat shape is illustrated, but the flat shape is not necessarily required. In this case, the present invention can be applied.
(2) In each of the above-described embodiments, the wound power generation element 3 in which the long strip-like foil-like positive electrode plate 31 and the like coated with the active material are wound is illustrated. The present invention can also be applied to the case where the negative electrode plate and the separator are both formed into a flat sheet shape and stacked to form a power generation element.

（３）上記各実施形態では、上記設定方向（上記各実施例における発電要素３の巻回軸芯方向）での押圧手段ＰＳの押圧範囲は、発電要素３のセパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、セパレータ３３の幅方向の中央寄りの設定位置に至る範囲としているが、発電要素３のセパレータ３３における箔状正極板３１の未塗工部３ａ側の端部から、セパレータ３３の幅方向の中央位置を超えて、箔状負極板３２の未塗工部３ｂ側の端部よりも手前側の設定位置に至る範囲であっても良く、要は、セパレータ３３における箔状負極板３２の未塗工部３ｂ側の端部付近にかかる押圧力が、セパレータ３３における箔状正極板３１の未塗工部３ａ側の端部付近にかかる押圧力よりも小さければ良い。 (3) In each of the above embodiments, the pressing range of the pressing means PS in the set direction (the direction of the winding axis of the power generating element 3 in each of the above examples) is the foil-like positive electrode plate 31 in the separator 33 of the power generating element 3. From the end of the uncoated portion 3a to the set position near the center of the separator 33 in the width direction, but on the uncoated portion 3a side of the foil-like positive electrode plate 31 in the separator 33 of the power generation element 3 It may be a range from the end to the set position on the near side of the end of the foil-like negative electrode plate 32 on the uncoated part 3b side beyond the center position in the width direction of the separator 33. The pressing force applied to the separator 33 near the end of the foil-shaped negative electrode plate 32 on the uncoated portion 3b side is greater than the pressing force applied to the separator 33 near the end of the foil-shaped positive electrode plate 31 on the uncoated portion 3a side. Small is good.

具体例としては、缶体１の手前側側面を一部切り欠いて示す図１３（ａ）に示すように、缶体１の扁平面をなす両内壁面に、缶体１の高さ方向に延びる帯状の段差として形成された凸部５１を、矢印Ｃで示す発電要素３の巻回軸芯方向に並べて配置する構成としても良い。帯状の凸部５１は、上記第１実施形態における凸部１ａと同様に、発電要素３の収納幅を部分的に狭くして、缶体１によって発電要素３を部分的に押圧するものである。
上記の凸部５１と発電要素３の構成部材との相対的な位置関係を図１３（ｂ）を参照して説明する。
図１３（ｂ）は、二次電池ＲＢの平面視による断面を模式的に示すもので、上記凸部５１と発電要素３の構成部材との位置関係を分かり易く示すために、箔状正極板３１及びその箔状正極板３１に塗布した正極活物質層３１ａ，箔状負極板３２及びその箔状負極板３２に塗布した負極活物質層３２ａ，並びに，セパレータ３３の厚さ等を誇張して図示している。尚、図１３（ｂ）では、図面を見易くするために、断面を示す斜線の図示を省略している。
矢印Ｃで示す発電要素３の巻回軸芯方向に並ぶ凸部５１は、正極の未塗工部３ａ側の端（図１３（ｂ）における左端）に位置する凸部５１が、セパレータ３３における、正極の未塗工部３ａ側端部を押圧する位置関係となっている。 As a specific example, as shown in FIG. 13A in which the front side surface of the can body 1 is partially cut away, both the inner wall surfaces forming the flat surfaces of the can body 1 are arranged in the height direction of the can body 1. It is good also as a structure which arrange | positions the convex part 51 formed as the extending | stretching strip | belt-shaped level | step difference along with the winding axis direction of the electric power generation element 3 shown by the arrow C. As shown in FIG. The belt-like convex part 51 partially narrows the storage width of the power generation element 3 and partially presses the power generation element 3 by the can body 1 like the convex part 1a in the first embodiment. .
A relative positional relationship between the convex portion 51 and the constituent members of the power generation element 3 will be described with reference to FIG.
FIG. 13 (b) schematically shows a cross section of the secondary battery RB in plan view, and a foil-like positive electrode plate is shown for easy understanding of the positional relationship between the convex portion 51 and the constituent members of the power generating element 3. 31 and the positive electrode active material layer 31a applied to the foil-like positive electrode plate 31, the foil-like negative electrode plate 32, the negative electrode active material layer 32a applied to the foil-like negative electrode plate 32, and the thickness of the separator 33 are exaggerated. It is shown. In FIG. 13B, the hatched lines indicating the cross section are not shown for easy viewing of the drawing.
Convex portions 51 arranged in the direction of the winding axis of the power generation element 3 indicated by the arrow C are located on the end of the positive electrode uncoated portion 3a side (the left end in FIG. 13B). The positional relationship is such that the uncoated portion 3a side end of the positive electrode is pressed.

一方、負極の未塗工部３ｂ側の端（図１３（ｂ）における右端）に位置する凸部５１は、セパレータ３３における、負極の未塗工部３ｂ側端部よりも若干内方側位置を押圧する位置関係となっている。
従って、セパレータ３３における、箔状正極板３１の未塗工部３ａ側の端部（上記第１の端部）が、セパレータ３３における、箔状負極板３２の未塗工部３ｂ側の端部（上記第２の端部）よりも強く押圧される関係となっており、二次電池ＲＢの過熱に伴ってセパレータ３３が縮んだときに、負極側において先行して短絡が発生し、過度の温度上昇を伴うことなく二次電池ＲＢが緩やかに故障する。 On the other hand, the convex portion 51 located at the end of the negative electrode uncoated portion 3b side (the right end in FIG. 13B) is located slightly inward of the separator 33 at the negative electrode uncoated portion 3b side end. It is the positional relationship which presses.
Therefore, the end of the separator 33 on the uncoated portion 3a side of the foil-shaped positive electrode plate 31 (the first end) is the end of the separator 33 on the uncoated portion 3b side of the foil-shaped negative electrode plate 32. When the separator 33 contracts due to overheating of the secondary battery RB, a short circuit occurs in advance on the negative electrode side, resulting in excessive pressure. The secondary battery RB slowly fails without increasing the temperature.

更に他の具体例としては、上記第３実施形態における図１１と対応する図１４に示すように、複数個の二次電池ＲＢで構成する電池モジュールにおいて、二次電池ＲＢ間に配置されるスペーサ６１を利用して、缶体１の外部から間接的に発電要素３を押圧する構成においても、スペーサ６１の表裏両面に形成する凸部６１ａを、図１３（ａ）の缶体１内壁面に形成する凸部５１と同様の形状及び配置としても良い。
上記の凸部６１ａと発電要素３の構成部材との相対的な位置関係を図１５に示す。
図１５は、スペーサ６１に挟まれた状態の二次電池ＲＢの平面視による断面を、上述の図１３（ｂ）と同様に模式的に示すもので、上記凸部６１ａと発電要素３の構成部材との位置関係を分かり易く示すために、箔状正極板３１及びその箔状正極板３１に塗布した正極活物質層３１ａ，箔状負極板３２及びその箔状負極板３２に塗布した負極活物質層３２ａ，並びに，セパレータ３３の厚さ等を誇張して図示している。尚、図１５でも、図面を見易くするために、断面を示す斜線の図示を省略している。 As still another specific example, as shown in FIG. 14 corresponding to FIG. 11 in the third embodiment, a spacer disposed between the secondary batteries RB in a battery module composed of a plurality of secondary batteries RB. Even in the configuration in which the power generation element 3 is pressed indirectly from the outside of the can body 1 using 61, the convex portions 61a formed on the front and back surfaces of the spacer 61 are formed on the inner wall surface of the can body 1 in FIG. It is good also as a shape and arrangement | positioning similar to the convex part 51 to form.
FIG. 15 shows a relative positional relationship between the convex portion 61a and the constituent members of the power generation element 3.
FIG. 15 schematically shows a cross section of the secondary battery RB in a state sandwiched between the spacers 61 in the same manner as in FIG. 13B, and the configuration of the convex portion 61 a and the power generation element 3. In order to show the positional relationship with the members in an easy-to-understand manner, the foil-like positive electrode plate 31 and the positive electrode active material layer 31a applied to the foil-like positive electrode plate 31, the foil-like negative electrode plate 32, and the negative electrode active material applied to the foil-like negative electrode plate 32 The thickness of the material layer 32a and the separator 33 are exaggerated. In FIG. 15, the hatched lines indicating the cross section are not shown for easy understanding of the drawing.

矢印Ｃで示す発電要素３の巻回軸芯方向に並ぶ凸部６１ａは、正極の未塗工部３ａ側の端（図１５における左端）に位置する凸部６１ａが、セパレータ３３における、正極の未塗工部３ａ側端部を押圧する位置関係となっている。
一方、負極の未塗工部３ｂ側の端（図１５における右端）に位置する凸部６１ａは、セパレータ３３における、負極の未塗工部３ｂ側端部よりも若干内方側位置を押圧する位置関係となっている。
従って、セパレータ３３における、箔状正極板３１の未塗工部３ａ側の端部（上記第１の端部）が、セパレータ３３における、箔状負極板３２の未塗工部３ｂ側の端部（上記第２の端部）よりも強く押圧される関係となっており、二次電池ＲＢの過熱に伴ってセパレータ３３が縮んだときに、負極側において先行して短絡が発生し、過度の温度上昇を伴うことなく二次電池ＲＢが緩やかに故障する。
更に、図１３及び図１４で示す具体例については、缶体１の内壁面に形成する凸部５１及びスペーサ６１に形成する凸部６１ａの具体的な形状は適宜に変更可能であり、例えば、図１６に示すように、凸部７１を島状に並べて配置するような構成としても良い。 The convex portions 61a arranged in the winding axis direction of the power generating element 3 indicated by the arrow C are arranged such that the convex portion 61a located at the end of the positive electrode uncoated portion 3a side (left end in FIG. 15) is the positive electrode of the separator 33. The positional relationship is such that the uncoated portion 3a side end is pressed.
On the other hand, the convex portion 61a located at the end of the negative electrode on the uncoated portion 3b side (the right end in FIG. 15) slightly presses the inner side position of the separator 33 relative to the end of the negative electrode on the uncoated portion 3b side. It is a positional relationship.
Therefore, the end of the separator 33 on the uncoated portion 3a side of the foil-shaped positive electrode plate 31 (the first end) is the end of the separator 33 on the uncoated portion 3b side of the foil-shaped negative electrode plate 32. When the separator 33 contracts due to overheating of the secondary battery RB, a short circuit occurs in advance on the negative electrode side, resulting in excessive pressure. The secondary battery RB slowly fails without increasing the temperature.
Furthermore, about the specific example shown in FIG.13 and FIG.14, the specific shape of the convex part 51a formed in the convex part 51 formed in the inner wall surface of the can 1 and the spacer 61 can be changed suitably, for example, As shown in FIG. 16, the convex portions 71 may be arranged in an island shape.

（４）上記各実施形態では、本発明をリチウムイオン電池に適用する場合を例示しているが、リチウムイオン電池以外の二次電池や、更には、一次電池にも本発明を適用できる。
（５）上記第３実施形態では、二次電池ＲＢを複数個並べて配置して構成した電池モジュールＢＭを例示して、押圧手段ＰＳにて電池筐体ＢＣの外部から発電要素３を間接的に押圧する場合を例示しているが、電池モジュールＢＭではなく、単体の二次電池ＲＢに対して、上記第３実施形態におけるスペーサ４１のような部材で、二次電池ＲＢの電池筐体ＢＣを押圧するようにしても良い。 (4) In each of the above embodiments, the case where the present invention is applied to a lithium ion battery is illustrated, but the present invention can also be applied to a secondary battery other than a lithium ion battery, and further to a primary battery.
(5) In the third embodiment, the battery module BM configured by arranging a plurality of secondary batteries RB side by side is illustrated, and the power generation element 3 is indirectly connected from the outside of the battery casing BC by the pressing means PS. Although the case of pressing is illustrated, the battery casing BC of the secondary battery RB is not a battery module BM but a member such as the spacer 41 in the third embodiment with respect to a single secondary battery RB. You may make it press.

３ 発電要素
３ａ，３ｂ 未塗工部
１３ 押圧部材
１３ａ，１３ｂ 押圧板
１３ｃ 連結部
３１ 箔状正極板
３２ 箔状負極板
３３ セパレータ
４１ スペーサ
ＢＣ 電池筐体
ＢＭ 電池モジュール
ＰＳ 押圧手段 DESCRIPTION OF SYMBOLS 3 Power generation element 3a, 3b Uncoated part 13 Press member 13a, 13b Press plate 13c Connection part 31 Foil-like positive electrode plate 32 Foil-like negative electrode plate 33 Separator 41 Spacer BC Battery housing BM Battery module PS Press means

Claims (11)

夫々活物質層を形成した箔状正極板と箔状負極板とをセパレータを挟んだ状態で積層した発電要素が備えられ、
前記発電要素における設定方向の端部において、前記箔状正極板及び前記箔状負極板に前記活物質層を形成していない未形成部が配置され、
前記箔状正極板の前記未形成部と前記箔状負極板の前記未形成部とは、前記設定方向で逆側に位置し、且つ、前記セパレータ及び対向する前記箔状負極板又は前記箔状正極板よりも前記設定方向で突出する状態で配置された電池であって、
前記箔状正極板の前記未形成部側に位置する第１の端部から前記箔状負極板の前記未形成部側に位置する第２の端部に亘って配置されている前記セパレータにおいて、前記第１の端部が、前記第２の端部よりも強く押圧され、前記発電要素が過熱状態となったときに、前記セパレータが、前記箔状正極板の前記未形成部側よりも前記箔状負極板の前記未形成部側の端部が先行して縮む状態とする押圧手段が備えられている電池。 A power generation element is provided in which a foil-like positive electrode plate and a foil-like negative electrode plate each having an active material layer formed thereon are stacked with a separator interposed therebetween,
In the end portion in the setting direction of the power generation element, an unformed portion where the active material layer is not formed is disposed on the foil-like positive electrode plate and the foil-like negative electrode plate,
The unformed part of the foil-like positive electrode plate and the unformed part of the foil-like negative electrode plate are located on the opposite side in the setting direction, and the separator and the foil-like negative electrode plate or the foil-like facing each other. The battery is arranged in a state protruding from the positive electrode plate in the setting direction,
In the separator disposed from the first end located on the unformed part side of the foil-like positive electrode plate to the second end located on the unformed part side of the foil-like negative electrode plate, When the first end portion is pressed stronger than the second end portion and the power generation element is in an overheated state, the separator is more than the unformed portion side of the foil-like positive electrode plate. A battery provided with pressing means for bringing the end portion of the foil-shaped negative electrode plate on the unformed portion side into a contracted state in advance . 前記押圧手段は、前記発電要素を収納する電池筐体の内部空間において、前記セパレータにおける前記第１の端部に対する収納幅を、前記第２の端部に対する収納幅よりも幅狭に設定することによって構成されている請求項１記載の電池。   In the internal space of the battery housing that houses the power generation element, the pressing means sets a storage width for the first end of the separator to be narrower than a storage width for the second end. The battery according to claim 1, comprising: 前記押圧手段は、前記発電要素を収納する電池筐体の内壁と前記発電要素との間に配置されて、前記発電要素を押圧する押圧部材にて構成されている請求項１記載の電池。   The battery according to claim 1, wherein the pressing means is configured by a pressing member that is disposed between an inner wall of a battery housing that houses the power generation element and the power generation element, and presses the power generation element. 前記押圧部材は、略平行姿勢で対向する一対の押圧板と、その一対の押圧板の端部同士を連結する連結部とを有する形状に形成され、
前記一対の押圧板が、前記発電要素を挟み込んで押圧する姿勢で配置されている請求項３記載の電池。 The pressing member is formed in a shape having a pair of pressing plates opposed in a substantially parallel posture, and a connecting portion that connects ends of the pair of pressing plates.
The battery according to claim 3, wherein the pair of pressing plates are arranged in a posture to sandwich and press the power generation element. 前記押圧部材の少なくとも一部が、前記設定方向で前記発電要素の両側に位置する前記電池筐体の一対の内壁に接当している請求項４記載の電池。   The battery according to claim 4, wherein at least a part of the pressing member is in contact with a pair of inner walls of the battery casing located on both sides of the power generation element in the setting direction. 前記電池筐体の内部空間が略直方体形状に形成され、
前記電池筐体における、前記一対の押圧板が接当する内壁と前記一対の内壁との双方に直交する内壁に、前記押圧部材の前記連結部が接当する状態で配置されている請求項５記載の電池。 The internal space of the battery casing is formed in a substantially rectangular parallelepiped shape,
6. The battery casing is disposed in a state in which the connecting portion of the pressing member is in contact with an inner wall orthogonal to both the inner wall with which the pair of pressing plates abut and the pair of inner walls. The battery described. 前記押圧部材は、前記発電要素の外周に巻回した帯状部材にて構成されている請求項３記載の電池。   The battery according to claim 3, wherein the pressing member is constituted by a belt-like member wound around the outer periphery of the power generation element. 前記押圧手段は、前記発電要素の前記セパレータにおける、前記第１の端部を、電池筐体の外部から押圧するように構成されている請求項１記載の電池。   The battery according to claim 1, wherein the pressing means is configured to press the first end portion of the separator of the power generation element from the outside of the battery casing. 前記押圧手段は、複数の電池を並べて構成される電池モジュールにおいて、電池間に配置されるスペーサにて構成されている請求項８記載の電池。   The battery according to claim 8, wherein the pressing means is configured by a spacer disposed between the batteries in a battery module configured by arranging a plurality of batteries. 前記発電要素は、長尺帯状に形成された前記箔状正極板と長尺帯状に形成された前記箔状負極板とを、長尺帯状に形成された前記セパレータを挟んだ状態で、前記設定方向を巻回軸芯方向とする巻回軸芯周りに巻回して構成され、
前記箔状正極板及び前記箔状負極板の幅方向端部に前記未形成部が形成され、
前記箔状正極板の前記未形成部と前記箔状負極板の前記未形成部とは、前記幅方向で逆側に位置し、且つ、前記セパレータ及び対向する前記箔状負極板又は前記箔状正極板よりも前記幅方向で突出する状態で配置されている請求項１〜９のいずれか１項に記載の電池。 The power generation element is configured such that the foil-shaped positive electrode plate formed in a long strip shape and the foil-shaped negative electrode plate formed in a long strip shape are sandwiched between the separators formed in a long strip shape. Constructed by winding around the winding axis with the direction as the winding axis direction,
The unformed part is formed at the end in the width direction of the foil-like positive electrode plate and the foil-like negative electrode plate,
The unformed part of the foil-shaped positive electrode plate and the unformed part of the foil-shaped negative electrode plate are located on the opposite side in the width direction, and are opposed to the separator and the foil-shaped negative electrode plate or the foil-shaped electrode. The battery according to any one of claims 1 to 9, wherein the battery is disposed so as to protrude in the width direction from the positive electrode plate. 夫々活物質層を形成した箔状正極板と箔状負極板とをセパレータを挟んだ状態で積層した発電要素が備えられ、A power generation element is provided in which a foil-like positive electrode plate and a foil-like negative electrode plate each having an active material layer formed thereon are stacked with a separator interposed therebetween,
前記発電要素における設定方向の端部において、前記箔状正極板及び前記箔状負極板に前記活物質層を形成していない未形成部が配置され、  In the end portion in the setting direction of the power generation element, an unformed portion where the active material layer is not formed is disposed on the foil-like positive electrode plate and the foil-like negative electrode plate,
前記箔状正極板の前記未形成部と前記箔状負極板の前記未形成部とは、前記設定方向で逆側に位置し、且つ、前記セパレータ及び対向する前記箔状負極板又は前記箔状正極板よりも前記設定方向で突出する状態で配置された電池であって、  The unformed part of the foil-like positive electrode plate and the unformed part of the foil-like negative electrode plate are located on the opposite side in the setting direction, and the separator and the foil-like negative electrode plate or the foil-like facing each other. The battery is arranged in a state protruding from the positive electrode plate in the setting direction,
前記箔状正極板の前記未形成部側に位置する第１の端部から前記箔状負極板の前記未形成部側に位置する第２の端部に亘って配置されている前記セパレータにおいて、前記第１の端部が、前記第２の端部よりも強く押圧される状態とする押圧手段が備えられ、  In the separator disposed from the first end located on the unformed part side of the foil-like positive electrode plate to the second end located on the unformed part side of the foil-like negative electrode plate, The first end portion is provided with pressing means for pressing the second end portion more strongly than the second end portion,
前記押圧手段は、前記セパレータにおける前記第１の端部側の端縁を押圧している電池。  The battery in which the pressing means presses an edge of the separator on the first end side.
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